2 * linux/drivers/char/synclink.c
4 * $Id: synclink.c,v 4.38 2005/11/07 16:30:34 paulkf Exp $
6 * Device driver for Microgate SyncLink ISA and PCI
7 * high speed multiprotocol serial adapters.
9 * written by Paul Fulghum for Microgate Corporation
10 * paulkf@microgate.com
12 * Microgate and SyncLink are trademarks of Microgate Corporation
14 * Derived from serial.c written by Theodore Ts'o and Linus Torvalds
16 * Original release 01/11/99
18 * This code is released under the GNU General Public License (GPL)
20 * This driver is primarily intended for use in synchronous
21 * HDLC mode. Asynchronous mode is also provided.
23 * When operating in synchronous mode, each call to mgsl_write()
24 * contains exactly one complete HDLC frame. Calling mgsl_put_char
25 * will start assembling an HDLC frame that will not be sent until
26 * mgsl_flush_chars or mgsl_write is called.
28 * Synchronous receive data is reported as complete frames. To accomplish
29 * this, the TTY flip buffer is bypassed (too small to hold largest
30 * frame and may fragment frames) and the line discipline
31 * receive entry point is called directly.
33 * This driver has been tested with a slightly modified ppp.c driver
34 * for synchronous PPP.
37 * Added interface for syncppp.c driver (an alternate synchronous PPP
38 * implementation that also supports Cisco HDLC). Each device instance
39 * registers as a tty device AND a network device (if dosyncppp option
40 * is set for the device). The functionality is determined by which
41 * device interface is opened.
43 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
44 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
45 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
46 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
47 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
48 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
49 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
50 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
51 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
52 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
53 * OF THE POSSIBILITY OF SUCH DAMAGE.
57 # define BREAKPOINT() asm(" int $3");
59 # define BREAKPOINT() { }
62 #define MAX_ISA_DEVICES 10
63 #define MAX_PCI_DEVICES 10
64 #define MAX_TOTAL_DEVICES 20
66 #include <linux/module.h>
67 #include <linux/errno.h>
68 #include <linux/signal.h>
69 #include <linux/sched.h>
70 #include <linux/timer.h>
71 #include <linux/interrupt.h>
72 #include <linux/pci.h>
73 #include <linux/tty.h>
74 #include <linux/tty_flip.h>
75 #include <linux/serial.h>
76 #include <linux/major.h>
77 #include <linux/string.h>
78 #include <linux/fcntl.h>
79 #include <linux/ptrace.h>
80 #include <linux/ioport.h>
82 #include <linux/slab.h>
83 #include <linux/delay.h>
84 #include <linux/netdevice.h>
85 #include <linux/vmalloc.h>
86 #include <linux/init.h>
87 #include <linux/ioctl.h>
88 #include <linux/synclink.h>
90 #include <asm/system.h>
94 #include <linux/bitops.h>
95 #include <asm/types.h>
96 #include <linux/termios.h>
97 #include <linux/workqueue.h>
98 #include <linux/hdlc.h>
99 #include <linux/dma-mapping.h>
101 #if defined(CONFIG_HDLC) || (defined(CONFIG_HDLC_MODULE) && defined(CONFIG_SYNCLINK_MODULE))
102 #define SYNCLINK_GENERIC_HDLC 1
104 #define SYNCLINK_GENERIC_HDLC 0
107 #define GET_USER(error,value,addr) error = get_user(value,addr)
108 #define COPY_FROM_USER(error,dest,src,size) error = copy_from_user(dest,src,size) ? -EFAULT : 0
109 #define PUT_USER(error,value,addr) error = put_user(value,addr)
110 #define COPY_TO_USER(error,dest,src,size) error = copy_to_user(dest,src,size) ? -EFAULT : 0
112 #include <asm/uaccess.h>
114 #define RCLRVALUE 0xffff
116 static MGSL_PARAMS default_params = {
117 MGSL_MODE_HDLC, /* unsigned long mode */
118 0, /* unsigned char loopback; */
119 HDLC_FLAG_UNDERRUN_ABORT15, /* unsigned short flags; */
120 HDLC_ENCODING_NRZI_SPACE, /* unsigned char encoding; */
121 0, /* unsigned long clock_speed; */
122 0xff, /* unsigned char addr_filter; */
123 HDLC_CRC_16_CCITT, /* unsigned short crc_type; */
124 HDLC_PREAMBLE_LENGTH_8BITS, /* unsigned char preamble_length; */
125 HDLC_PREAMBLE_PATTERN_NONE, /* unsigned char preamble; */
126 9600, /* unsigned long data_rate; */
127 8, /* unsigned char data_bits; */
128 1, /* unsigned char stop_bits; */
129 ASYNC_PARITY_NONE /* unsigned char parity; */
132 #define SHARED_MEM_ADDRESS_SIZE 0x40000
133 #define BUFFERLISTSIZE 4096
134 #define DMABUFFERSIZE 4096
135 #define MAXRXFRAMES 7
137 typedef struct _DMABUFFERENTRY
139 u32 phys_addr; /* 32-bit flat physical address of data buffer */
140 volatile u16 count; /* buffer size/data count */
141 volatile u16 status; /* Control/status field */
142 volatile u16 rcc; /* character count field */
143 u16 reserved; /* padding required by 16C32 */
144 u32 link; /* 32-bit flat link to next buffer entry */
145 char *virt_addr; /* virtual address of data buffer */
146 u32 phys_entry; /* physical address of this buffer entry */
148 } DMABUFFERENTRY, *DMAPBUFFERENTRY;
150 /* The queue of BH actions to be performed */
153 #define BH_TRANSMIT 2
156 #define IO_PIN_SHUTDOWN_LIMIT 100
158 struct _input_signal_events {
169 /* transmit holding buffer definitions*/
170 #define MAX_TX_HOLDING_BUFFERS 5
171 struct tx_holding_buffer {
173 unsigned char * buffer;
178 * Device instance data structure
183 struct tty_port port;
187 struct mgsl_icount icount;
190 int x_char; /* xon/xoff character */
191 u16 read_status_mask;
192 u16 ignore_status_mask;
193 unsigned char *xmit_buf;
198 wait_queue_head_t status_event_wait_q;
199 wait_queue_head_t event_wait_q;
200 struct timer_list tx_timer; /* HDLC transmit timeout timer */
201 struct mgsl_struct *next_device; /* device list link */
203 spinlock_t irq_spinlock; /* spinlock for synchronizing with ISR */
204 struct work_struct task; /* task structure for scheduling bh */
206 u32 EventMask; /* event trigger mask */
207 u32 RecordedEvents; /* pending events */
209 u32 max_frame_size; /* as set by device config */
213 bool bh_running; /* Protection from multiple */
217 int dcd_chkcount; /* check counts to prevent */
218 int cts_chkcount; /* too many IRQs if a signal */
219 int dsr_chkcount; /* is floating */
222 char *buffer_list; /* virtual address of Rx & Tx buffer lists */
223 u32 buffer_list_phys;
224 dma_addr_t buffer_list_dma_addr;
226 unsigned int rx_buffer_count; /* count of total allocated Rx buffers */
227 DMABUFFERENTRY *rx_buffer_list; /* list of receive buffer entries */
228 unsigned int current_rx_buffer;
230 int num_tx_dma_buffers; /* number of tx dma frames required */
231 int tx_dma_buffers_used;
232 unsigned int tx_buffer_count; /* count of total allocated Tx buffers */
233 DMABUFFERENTRY *tx_buffer_list; /* list of transmit buffer entries */
234 int start_tx_dma_buffer; /* tx dma buffer to start tx dma operation */
235 int current_tx_buffer; /* next tx dma buffer to be loaded */
237 unsigned char *intermediate_rxbuffer;
239 int num_tx_holding_buffers; /* number of tx holding buffer allocated */
240 int get_tx_holding_index; /* next tx holding buffer for adapter to load */
241 int put_tx_holding_index; /* next tx holding buffer to store user request */
242 int tx_holding_count; /* number of tx holding buffers waiting */
243 struct tx_holding_buffer tx_holding_buffers[MAX_TX_HOLDING_BUFFERS];
247 bool rx_rcc_underrun;
256 char device_name[25]; /* device instance name */
258 unsigned int bus_type; /* expansion bus type (ISA,EISA,PCI) */
259 unsigned char bus; /* expansion bus number (zero based) */
260 unsigned char function; /* PCI device number */
262 unsigned int io_base; /* base I/O address of adapter */
263 unsigned int io_addr_size; /* size of the I/O address range */
264 bool io_addr_requested; /* true if I/O address requested */
266 unsigned int irq_level; /* interrupt level */
267 unsigned long irq_flags;
268 bool irq_requested; /* true if IRQ requested */
270 unsigned int dma_level; /* DMA channel */
271 bool dma_requested; /* true if dma channel requested */
277 MGSL_PARAMS params; /* communications parameters */
279 unsigned char serial_signals; /* current serial signal states */
281 bool irq_occurred; /* for diagnostics use */
282 unsigned int init_error; /* Initialization startup error (DIAGS) */
283 int fDiagnosticsmode; /* Driver in Diagnostic mode? (DIAGS) */
286 unsigned char* memory_base; /* shared memory address (PCI only) */
287 u32 phys_memory_base;
288 bool shared_mem_requested;
290 unsigned char* lcr_base; /* local config registers (PCI only) */
293 bool lcr_mem_requested;
296 char flag_buf[MAX_ASYNC_BUFFER_SIZE];
297 char char_buf[MAX_ASYNC_BUFFER_SIZE];
298 bool drop_rts_on_tx_done;
300 bool loopmode_insert_requested;
301 bool loopmode_send_done_requested;
303 struct _input_signal_events input_signal_events;
305 /* generic HDLC device parts */
310 #if SYNCLINK_GENERIC_HDLC
311 struct net_device *netdev;
315 #define MGSL_MAGIC 0x5401
318 * The size of the serial xmit buffer is 1 page, or 4096 bytes
320 #ifndef SERIAL_XMIT_SIZE
321 #define SERIAL_XMIT_SIZE 4096
325 * These macros define the offsets used in calculating the
326 * I/O address of the specified USC registers.
330 #define DCPIN 2 /* Bit 1 of I/O address */
331 #define SDPIN 4 /* Bit 2 of I/O address */
333 #define DCAR 0 /* DMA command/address register */
334 #define CCAR SDPIN /* channel command/address register */
335 #define DATAREG DCPIN + SDPIN /* serial data register */
340 * These macros define the register address (ordinal number)
341 * used for writing address/value pairs to the USC.
344 #define CMR 0x02 /* Channel mode Register */
345 #define CCSR 0x04 /* Channel Command/status Register */
346 #define CCR 0x06 /* Channel Control Register */
347 #define PSR 0x08 /* Port status Register */
348 #define PCR 0x0a /* Port Control Register */
349 #define TMDR 0x0c /* Test mode Data Register */
350 #define TMCR 0x0e /* Test mode Control Register */
351 #define CMCR 0x10 /* Clock mode Control Register */
352 #define HCR 0x12 /* Hardware Configuration Register */
353 #define IVR 0x14 /* Interrupt Vector Register */
354 #define IOCR 0x16 /* Input/Output Control Register */
355 #define ICR 0x18 /* Interrupt Control Register */
356 #define DCCR 0x1a /* Daisy Chain Control Register */
357 #define MISR 0x1c /* Misc Interrupt status Register */
358 #define SICR 0x1e /* status Interrupt Control Register */
359 #define RDR 0x20 /* Receive Data Register */
360 #define RMR 0x22 /* Receive mode Register */
361 #define RCSR 0x24 /* Receive Command/status Register */
362 #define RICR 0x26 /* Receive Interrupt Control Register */
363 #define RSR 0x28 /* Receive Sync Register */
364 #define RCLR 0x2a /* Receive count Limit Register */
365 #define RCCR 0x2c /* Receive Character count Register */
366 #define TC0R 0x2e /* Time Constant 0 Register */
367 #define TDR 0x30 /* Transmit Data Register */
368 #define TMR 0x32 /* Transmit mode Register */
369 #define TCSR 0x34 /* Transmit Command/status Register */
370 #define TICR 0x36 /* Transmit Interrupt Control Register */
371 #define TSR 0x38 /* Transmit Sync Register */
372 #define TCLR 0x3a /* Transmit count Limit Register */
373 #define TCCR 0x3c /* Transmit Character count Register */
374 #define TC1R 0x3e /* Time Constant 1 Register */
378 * MACRO DEFINITIONS FOR DMA REGISTERS
381 #define DCR 0x06 /* DMA Control Register (shared) */
382 #define DACR 0x08 /* DMA Array count Register (shared) */
383 #define BDCR 0x12 /* Burst/Dwell Control Register (shared) */
384 #define DIVR 0x14 /* DMA Interrupt Vector Register (shared) */
385 #define DICR 0x18 /* DMA Interrupt Control Register (shared) */
386 #define CDIR 0x1a /* Clear DMA Interrupt Register (shared) */
387 #define SDIR 0x1c /* Set DMA Interrupt Register (shared) */
389 #define TDMR 0x02 /* Transmit DMA mode Register */
390 #define TDIAR 0x1e /* Transmit DMA Interrupt Arm Register */
391 #define TBCR 0x2a /* Transmit Byte count Register */
392 #define TARL 0x2c /* Transmit Address Register (low) */
393 #define TARU 0x2e /* Transmit Address Register (high) */
394 #define NTBCR 0x3a /* Next Transmit Byte count Register */
395 #define NTARL 0x3c /* Next Transmit Address Register (low) */
396 #define NTARU 0x3e /* Next Transmit Address Register (high) */
398 #define RDMR 0x82 /* Receive DMA mode Register (non-shared) */
399 #define RDIAR 0x9e /* Receive DMA Interrupt Arm Register */
400 #define RBCR 0xaa /* Receive Byte count Register */
401 #define RARL 0xac /* Receive Address Register (low) */
402 #define RARU 0xae /* Receive Address Register (high) */
403 #define NRBCR 0xba /* Next Receive Byte count Register */
404 #define NRARL 0xbc /* Next Receive Address Register (low) */
405 #define NRARU 0xbe /* Next Receive Address Register (high) */
409 * MACRO DEFINITIONS FOR MODEM STATUS BITS
412 #define MODEMSTATUS_DTR 0x80
413 #define MODEMSTATUS_DSR 0x40
414 #define MODEMSTATUS_RTS 0x20
415 #define MODEMSTATUS_CTS 0x10
416 #define MODEMSTATUS_RI 0x04
417 #define MODEMSTATUS_DCD 0x01
421 * Channel Command/Address Register (CCAR) Command Codes
424 #define RTCmd_Null 0x0000
425 #define RTCmd_ResetHighestIus 0x1000
426 #define RTCmd_TriggerChannelLoadDma 0x2000
427 #define RTCmd_TriggerRxDma 0x2800
428 #define RTCmd_TriggerTxDma 0x3000
429 #define RTCmd_TriggerRxAndTxDma 0x3800
430 #define RTCmd_PurgeRxFifo 0x4800
431 #define RTCmd_PurgeTxFifo 0x5000
432 #define RTCmd_PurgeRxAndTxFifo 0x5800
433 #define RTCmd_LoadRcc 0x6800
434 #define RTCmd_LoadTcc 0x7000
435 #define RTCmd_LoadRccAndTcc 0x7800
436 #define RTCmd_LoadTC0 0x8800
437 #define RTCmd_LoadTC1 0x9000
438 #define RTCmd_LoadTC0AndTC1 0x9800
439 #define RTCmd_SerialDataLSBFirst 0xa000
440 #define RTCmd_SerialDataMSBFirst 0xa800
441 #define RTCmd_SelectBigEndian 0xb000
442 #define RTCmd_SelectLittleEndian 0xb800
446 * DMA Command/Address Register (DCAR) Command Codes
449 #define DmaCmd_Null 0x0000
450 #define DmaCmd_ResetTxChannel 0x1000
451 #define DmaCmd_ResetRxChannel 0x1200
452 #define DmaCmd_StartTxChannel 0x2000
453 #define DmaCmd_StartRxChannel 0x2200
454 #define DmaCmd_ContinueTxChannel 0x3000
455 #define DmaCmd_ContinueRxChannel 0x3200
456 #define DmaCmd_PauseTxChannel 0x4000
457 #define DmaCmd_PauseRxChannel 0x4200
458 #define DmaCmd_AbortTxChannel 0x5000
459 #define DmaCmd_AbortRxChannel 0x5200
460 #define DmaCmd_InitTxChannel 0x7000
461 #define DmaCmd_InitRxChannel 0x7200
462 #define DmaCmd_ResetHighestDmaIus 0x8000
463 #define DmaCmd_ResetAllChannels 0x9000
464 #define DmaCmd_StartAllChannels 0xa000
465 #define DmaCmd_ContinueAllChannels 0xb000
466 #define DmaCmd_PauseAllChannels 0xc000
467 #define DmaCmd_AbortAllChannels 0xd000
468 #define DmaCmd_InitAllChannels 0xf000
470 #define TCmd_Null 0x0000
471 #define TCmd_ClearTxCRC 0x2000
472 #define TCmd_SelectTicrTtsaData 0x4000
473 #define TCmd_SelectTicrTxFifostatus 0x5000
474 #define TCmd_SelectTicrIntLevel 0x6000
475 #define TCmd_SelectTicrdma_level 0x7000
476 #define TCmd_SendFrame 0x8000
477 #define TCmd_SendAbort 0x9000
478 #define TCmd_EnableDleInsertion 0xc000
479 #define TCmd_DisableDleInsertion 0xd000
480 #define TCmd_ClearEofEom 0xe000
481 #define TCmd_SetEofEom 0xf000
483 #define RCmd_Null 0x0000
484 #define RCmd_ClearRxCRC 0x2000
485 #define RCmd_EnterHuntmode 0x3000
486 #define RCmd_SelectRicrRtsaData 0x4000
487 #define RCmd_SelectRicrRxFifostatus 0x5000
488 #define RCmd_SelectRicrIntLevel 0x6000
489 #define RCmd_SelectRicrdma_level 0x7000
492 * Bits for enabling and disabling IRQs in Interrupt Control Register (ICR)
495 #define RECEIVE_STATUS BIT5
496 #define RECEIVE_DATA BIT4
497 #define TRANSMIT_STATUS BIT3
498 #define TRANSMIT_DATA BIT2
504 * Receive status Bits in Receive Command/status Register RCSR
507 #define RXSTATUS_SHORT_FRAME BIT8
508 #define RXSTATUS_CODE_VIOLATION BIT8
509 #define RXSTATUS_EXITED_HUNT BIT7
510 #define RXSTATUS_IDLE_RECEIVED BIT6
511 #define RXSTATUS_BREAK_RECEIVED BIT5
512 #define RXSTATUS_ABORT_RECEIVED BIT5
513 #define RXSTATUS_RXBOUND BIT4
514 #define RXSTATUS_CRC_ERROR BIT3
515 #define RXSTATUS_FRAMING_ERROR BIT3
516 #define RXSTATUS_ABORT BIT2
517 #define RXSTATUS_PARITY_ERROR BIT2
518 #define RXSTATUS_OVERRUN BIT1
519 #define RXSTATUS_DATA_AVAILABLE BIT0
520 #define RXSTATUS_ALL 0x01f6
521 #define usc_UnlatchRxstatusBits(a,b) usc_OutReg( (a), RCSR, (u16)((b) & RXSTATUS_ALL) )
524 * Values for setting transmit idle mode in
525 * Transmit Control/status Register (TCSR)
527 #define IDLEMODE_FLAGS 0x0000
528 #define IDLEMODE_ALT_ONE_ZERO 0x0100
529 #define IDLEMODE_ZERO 0x0200
530 #define IDLEMODE_ONE 0x0300
531 #define IDLEMODE_ALT_MARK_SPACE 0x0500
532 #define IDLEMODE_SPACE 0x0600
533 #define IDLEMODE_MARK 0x0700
534 #define IDLEMODE_MASK 0x0700
537 * IUSC revision identifiers
539 #define IUSC_SL1660 0x4d44
540 #define IUSC_PRE_SL1660 0x4553
543 * Transmit status Bits in Transmit Command/status Register (TCSR)
546 #define TCSR_PRESERVE 0x0F00
548 #define TCSR_UNDERWAIT BIT11
549 #define TXSTATUS_PREAMBLE_SENT BIT7
550 #define TXSTATUS_IDLE_SENT BIT6
551 #define TXSTATUS_ABORT_SENT BIT5
552 #define TXSTATUS_EOF_SENT BIT4
553 #define TXSTATUS_EOM_SENT BIT4
554 #define TXSTATUS_CRC_SENT BIT3
555 #define TXSTATUS_ALL_SENT BIT2
556 #define TXSTATUS_UNDERRUN BIT1
557 #define TXSTATUS_FIFO_EMPTY BIT0
558 #define TXSTATUS_ALL 0x00fa
559 #define usc_UnlatchTxstatusBits(a,b) usc_OutReg( (a), TCSR, (u16)((a)->tcsr_value + ((b) & 0x00FF)) )
562 #define MISCSTATUS_RXC_LATCHED BIT15
563 #define MISCSTATUS_RXC BIT14
564 #define MISCSTATUS_TXC_LATCHED BIT13
565 #define MISCSTATUS_TXC BIT12
566 #define MISCSTATUS_RI_LATCHED BIT11
567 #define MISCSTATUS_RI BIT10
568 #define MISCSTATUS_DSR_LATCHED BIT9
569 #define MISCSTATUS_DSR BIT8
570 #define MISCSTATUS_DCD_LATCHED BIT7
571 #define MISCSTATUS_DCD BIT6
572 #define MISCSTATUS_CTS_LATCHED BIT5
573 #define MISCSTATUS_CTS BIT4
574 #define MISCSTATUS_RCC_UNDERRUN BIT3
575 #define MISCSTATUS_DPLL_NO_SYNC BIT2
576 #define MISCSTATUS_BRG1_ZERO BIT1
577 #define MISCSTATUS_BRG0_ZERO BIT0
579 #define usc_UnlatchIostatusBits(a,b) usc_OutReg((a),MISR,(u16)((b) & 0xaaa0))
580 #define usc_UnlatchMiscstatusBits(a,b) usc_OutReg((a),MISR,(u16)((b) & 0x000f))
582 #define SICR_RXC_ACTIVE BIT15
583 #define SICR_RXC_INACTIVE BIT14
584 #define SICR_RXC (BIT15+BIT14)
585 #define SICR_TXC_ACTIVE BIT13
586 #define SICR_TXC_INACTIVE BIT12
587 #define SICR_TXC (BIT13+BIT12)
588 #define SICR_RI_ACTIVE BIT11
589 #define SICR_RI_INACTIVE BIT10
590 #define SICR_RI (BIT11+BIT10)
591 #define SICR_DSR_ACTIVE BIT9
592 #define SICR_DSR_INACTIVE BIT8
593 #define SICR_DSR (BIT9+BIT8)
594 #define SICR_DCD_ACTIVE BIT7
595 #define SICR_DCD_INACTIVE BIT6
596 #define SICR_DCD (BIT7+BIT6)
597 #define SICR_CTS_ACTIVE BIT5
598 #define SICR_CTS_INACTIVE BIT4
599 #define SICR_CTS (BIT5+BIT4)
600 #define SICR_RCC_UNDERFLOW BIT3
601 #define SICR_DPLL_NO_SYNC BIT2
602 #define SICR_BRG1_ZERO BIT1
603 #define SICR_BRG0_ZERO BIT0
605 void usc_DisableMasterIrqBit( struct mgsl_struct *info );
606 void usc_EnableMasterIrqBit( struct mgsl_struct *info );
607 void usc_EnableInterrupts( struct mgsl_struct *info, u16 IrqMask );
608 void usc_DisableInterrupts( struct mgsl_struct *info, u16 IrqMask );
609 void usc_ClearIrqPendingBits( struct mgsl_struct *info, u16 IrqMask );
611 #define usc_EnableInterrupts( a, b ) \
612 usc_OutReg( (a), ICR, (u16)((usc_InReg((a),ICR) & 0xff00) + 0xc0 + (b)) )
614 #define usc_DisableInterrupts( a, b ) \
615 usc_OutReg( (a), ICR, (u16)((usc_InReg((a),ICR) & 0xff00) + 0x80 + (b)) )
617 #define usc_EnableMasterIrqBit(a) \
618 usc_OutReg( (a), ICR, (u16)((usc_InReg((a),ICR) & 0x0f00) + 0xb000) )
620 #define usc_DisableMasterIrqBit(a) \
621 usc_OutReg( (a), ICR, (u16)(usc_InReg((a),ICR) & 0x7f00) )
623 #define usc_ClearIrqPendingBits( a, b ) usc_OutReg( (a), DCCR, 0x40 + (b) )
626 * Transmit status Bits in Transmit Control status Register (TCSR)
627 * and Transmit Interrupt Control Register (TICR) (except BIT2, BIT0)
630 #define TXSTATUS_PREAMBLE_SENT BIT7
631 #define TXSTATUS_IDLE_SENT BIT6
632 #define TXSTATUS_ABORT_SENT BIT5
633 #define TXSTATUS_EOF BIT4
634 #define TXSTATUS_CRC_SENT BIT3
635 #define TXSTATUS_ALL_SENT BIT2
636 #define TXSTATUS_UNDERRUN BIT1
637 #define TXSTATUS_FIFO_EMPTY BIT0
639 #define DICR_MASTER BIT15
640 #define DICR_TRANSMIT BIT0
641 #define DICR_RECEIVE BIT1
643 #define usc_EnableDmaInterrupts(a,b) \
644 usc_OutDmaReg( (a), DICR, (u16)(usc_InDmaReg((a),DICR) | (b)) )
646 #define usc_DisableDmaInterrupts(a,b) \
647 usc_OutDmaReg( (a), DICR, (u16)(usc_InDmaReg((a),DICR) & ~(b)) )
649 #define usc_EnableStatusIrqs(a,b) \
650 usc_OutReg( (a), SICR, (u16)(usc_InReg((a),SICR) | (b)) )
652 #define usc_DisablestatusIrqs(a,b) \
653 usc_OutReg( (a), SICR, (u16)(usc_InReg((a),SICR) & ~(b)) )
655 /* Transmit status Bits in Transmit Control status Register (TCSR) */
656 /* and Transmit Interrupt Control Register (TICR) (except BIT2, BIT0) */
659 #define DISABLE_UNCONDITIONAL 0
660 #define DISABLE_END_OF_FRAME 1
661 #define ENABLE_UNCONDITIONAL 2
662 #define ENABLE_AUTO_CTS 3
663 #define ENABLE_AUTO_DCD 3
664 #define usc_EnableTransmitter(a,b) \
665 usc_OutReg( (a), TMR, (u16)((usc_InReg((a),TMR) & 0xfffc) | (b)) )
666 #define usc_EnableReceiver(a,b) \
667 usc_OutReg( (a), RMR, (u16)((usc_InReg((a),RMR) & 0xfffc) | (b)) )
669 static u16 usc_InDmaReg( struct mgsl_struct *info, u16 Port );
670 static void usc_OutDmaReg( struct mgsl_struct *info, u16 Port, u16 Value );
671 static void usc_DmaCmd( struct mgsl_struct *info, u16 Cmd );
673 static u16 usc_InReg( struct mgsl_struct *info, u16 Port );
674 static void usc_OutReg( struct mgsl_struct *info, u16 Port, u16 Value );
675 static void usc_RTCmd( struct mgsl_struct *info, u16 Cmd );
676 void usc_RCmd( struct mgsl_struct *info, u16 Cmd );
677 void usc_TCmd( struct mgsl_struct *info, u16 Cmd );
679 #define usc_TCmd(a,b) usc_OutReg((a), TCSR, (u16)((a)->tcsr_value + (b)))
680 #define usc_RCmd(a,b) usc_OutReg((a), RCSR, (b))
682 #define usc_SetTransmitSyncChars(a,s0,s1) usc_OutReg((a), TSR, (u16)(((u16)s0<<8)|(u16)s1))
684 static void usc_process_rxoverrun_sync( struct mgsl_struct *info );
685 static void usc_start_receiver( struct mgsl_struct *info );
686 static void usc_stop_receiver( struct mgsl_struct *info );
688 static void usc_start_transmitter( struct mgsl_struct *info );
689 static void usc_stop_transmitter( struct mgsl_struct *info );
690 static void usc_set_txidle( struct mgsl_struct *info );
691 static void usc_load_txfifo( struct mgsl_struct *info );
693 static void usc_enable_aux_clock( struct mgsl_struct *info, u32 DataRate );
694 static void usc_enable_loopback( struct mgsl_struct *info, int enable );
696 static void usc_get_serial_signals( struct mgsl_struct *info );
697 static void usc_set_serial_signals( struct mgsl_struct *info );
699 static void usc_reset( struct mgsl_struct *info );
701 static void usc_set_sync_mode( struct mgsl_struct *info );
702 static void usc_set_sdlc_mode( struct mgsl_struct *info );
703 static void usc_set_async_mode( struct mgsl_struct *info );
704 static void usc_enable_async_clock( struct mgsl_struct *info, u32 DataRate );
706 static void usc_loopback_frame( struct mgsl_struct *info );
708 static void mgsl_tx_timeout(unsigned long context);
711 static void usc_loopmode_cancel_transmit( struct mgsl_struct * info );
712 static void usc_loopmode_insert_request( struct mgsl_struct * info );
713 static int usc_loopmode_active( struct mgsl_struct * info);
714 static void usc_loopmode_send_done( struct mgsl_struct * info );
716 static int mgsl_ioctl_common(struct mgsl_struct *info, unsigned int cmd, unsigned long arg);
718 #if SYNCLINK_GENERIC_HDLC
719 #define dev_to_port(D) (dev_to_hdlc(D)->priv)
720 static void hdlcdev_tx_done(struct mgsl_struct *info);
721 static void hdlcdev_rx(struct mgsl_struct *info, char *buf, int size);
722 static int hdlcdev_init(struct mgsl_struct *info);
723 static void hdlcdev_exit(struct mgsl_struct *info);
727 * Defines a BUS descriptor value for the PCI adapter
728 * local bus address ranges.
731 #define BUS_DESCRIPTOR( WrHold, WrDly, RdDly, Nwdd, Nwad, Nxda, Nrdd, Nrad ) \
742 static void mgsl_trace_block(struct mgsl_struct *info,const char* data, int count, int xmit);
745 * Adapter diagnostic routines
747 static bool mgsl_register_test( struct mgsl_struct *info );
748 static bool mgsl_irq_test( struct mgsl_struct *info );
749 static bool mgsl_dma_test( struct mgsl_struct *info );
750 static bool mgsl_memory_test( struct mgsl_struct *info );
751 static int mgsl_adapter_test( struct mgsl_struct *info );
754 * device and resource management routines
756 static int mgsl_claim_resources(struct mgsl_struct *info);
757 static void mgsl_release_resources(struct mgsl_struct *info);
758 static void mgsl_add_device(struct mgsl_struct *info);
759 static struct mgsl_struct* mgsl_allocate_device(void);
762 * DMA buffer manupulation functions.
764 static void mgsl_free_rx_frame_buffers( struct mgsl_struct *info, unsigned int StartIndex, unsigned int EndIndex );
765 static bool mgsl_get_rx_frame( struct mgsl_struct *info );
766 static bool mgsl_get_raw_rx_frame( struct mgsl_struct *info );
767 static void mgsl_reset_rx_dma_buffers( struct mgsl_struct *info );
768 static void mgsl_reset_tx_dma_buffers( struct mgsl_struct *info );
769 static int num_free_tx_dma_buffers(struct mgsl_struct *info);
770 static void mgsl_load_tx_dma_buffer( struct mgsl_struct *info, const char *Buffer, unsigned int BufferSize);
771 static void mgsl_load_pci_memory(char* TargetPtr, const char* SourcePtr, unsigned short count);
774 * DMA and Shared Memory buffer allocation and formatting
776 static int mgsl_allocate_dma_buffers(struct mgsl_struct *info);
777 static void mgsl_free_dma_buffers(struct mgsl_struct *info);
778 static int mgsl_alloc_frame_memory(struct mgsl_struct *info, DMABUFFERENTRY *BufferList,int Buffercount);
779 static void mgsl_free_frame_memory(struct mgsl_struct *info, DMABUFFERENTRY *BufferList,int Buffercount);
780 static int mgsl_alloc_buffer_list_memory(struct mgsl_struct *info);
781 static void mgsl_free_buffer_list_memory(struct mgsl_struct *info);
782 static int mgsl_alloc_intermediate_rxbuffer_memory(struct mgsl_struct *info);
783 static void mgsl_free_intermediate_rxbuffer_memory(struct mgsl_struct *info);
784 static int mgsl_alloc_intermediate_txbuffer_memory(struct mgsl_struct *info);
785 static void mgsl_free_intermediate_txbuffer_memory(struct mgsl_struct *info);
786 static bool load_next_tx_holding_buffer(struct mgsl_struct *info);
787 static int save_tx_buffer_request(struct mgsl_struct *info,const char *Buffer, unsigned int BufferSize);
790 * Bottom half interrupt handlers
792 static void mgsl_bh_handler(struct work_struct *work);
793 static void mgsl_bh_receive(struct mgsl_struct *info);
794 static void mgsl_bh_transmit(struct mgsl_struct *info);
795 static void mgsl_bh_status(struct mgsl_struct *info);
798 * Interrupt handler routines and dispatch table.
800 static void mgsl_isr_null( struct mgsl_struct *info );
801 static void mgsl_isr_transmit_data( struct mgsl_struct *info );
802 static void mgsl_isr_receive_data( struct mgsl_struct *info );
803 static void mgsl_isr_receive_status( struct mgsl_struct *info );
804 static void mgsl_isr_transmit_status( struct mgsl_struct *info );
805 static void mgsl_isr_io_pin( struct mgsl_struct *info );
806 static void mgsl_isr_misc( struct mgsl_struct *info );
807 static void mgsl_isr_receive_dma( struct mgsl_struct *info );
808 static void mgsl_isr_transmit_dma( struct mgsl_struct *info );
810 typedef void (*isr_dispatch_func)(struct mgsl_struct *);
812 static isr_dispatch_func UscIsrTable[7] =
817 mgsl_isr_transmit_data,
818 mgsl_isr_transmit_status,
819 mgsl_isr_receive_data,
820 mgsl_isr_receive_status
824 * ioctl call handlers
826 static int tiocmget(struct tty_struct *tty, struct file *file);
827 static int tiocmset(struct tty_struct *tty, struct file *file,
828 unsigned int set, unsigned int clear);
829 static int mgsl_get_stats(struct mgsl_struct * info, struct mgsl_icount
830 __user *user_icount);
831 static int mgsl_get_params(struct mgsl_struct * info, MGSL_PARAMS __user *user_params);
832 static int mgsl_set_params(struct mgsl_struct * info, MGSL_PARAMS __user *new_params);
833 static int mgsl_get_txidle(struct mgsl_struct * info, int __user *idle_mode);
834 static int mgsl_set_txidle(struct mgsl_struct * info, int idle_mode);
835 static int mgsl_txenable(struct mgsl_struct * info, int enable);
836 static int mgsl_txabort(struct mgsl_struct * info);
837 static int mgsl_rxenable(struct mgsl_struct * info, int enable);
838 static int mgsl_wait_event(struct mgsl_struct * info, int __user *mask);
839 static int mgsl_loopmode_send_done( struct mgsl_struct * info );
841 /* set non-zero on successful registration with PCI subsystem */
842 static bool pci_registered;
845 * Global linked list of SyncLink devices
847 static struct mgsl_struct *mgsl_device_list;
848 static int mgsl_device_count;
851 * Set this param to non-zero to load eax with the
852 * .text section address and breakpoint on module load.
853 * This is useful for use with gdb and add-symbol-file command.
855 static int break_on_load;
858 * Driver major number, defaults to zero to get auto
859 * assigned major number. May be forced as module parameter.
864 * Array of user specified options for ISA adapters.
866 static int io[MAX_ISA_DEVICES];
867 static int irq[MAX_ISA_DEVICES];
868 static int dma[MAX_ISA_DEVICES];
869 static int debug_level;
870 static int maxframe[MAX_TOTAL_DEVICES];
871 static int dosyncppp[MAX_TOTAL_DEVICES];
872 static int txdmabufs[MAX_TOTAL_DEVICES];
873 static int txholdbufs[MAX_TOTAL_DEVICES];
875 module_param(break_on_load, bool, 0);
876 module_param(ttymajor, int, 0);
877 module_param_array(io, int, NULL, 0);
878 module_param_array(irq, int, NULL, 0);
879 module_param_array(dma, int, NULL, 0);
880 module_param(debug_level, int, 0);
881 module_param_array(maxframe, int, NULL, 0);
882 module_param_array(dosyncppp, int, NULL, 0);
883 module_param_array(txdmabufs, int, NULL, 0);
884 module_param_array(txholdbufs, int, NULL, 0);
886 static char *driver_name = "SyncLink serial driver";
887 static char *driver_version = "$Revision: 4.38 $";
889 static int synclink_init_one (struct pci_dev *dev,
890 const struct pci_device_id *ent);
891 static void synclink_remove_one (struct pci_dev *dev);
893 static struct pci_device_id synclink_pci_tbl[] = {
894 { PCI_VENDOR_ID_MICROGATE, PCI_DEVICE_ID_MICROGATE_USC, PCI_ANY_ID, PCI_ANY_ID, },
895 { PCI_VENDOR_ID_MICROGATE, 0x0210, PCI_ANY_ID, PCI_ANY_ID, },
896 { 0, }, /* terminate list */
898 MODULE_DEVICE_TABLE(pci, synclink_pci_tbl);
900 MODULE_LICENSE("GPL");
902 static struct pci_driver synclink_pci_driver = {
904 .id_table = synclink_pci_tbl,
905 .probe = synclink_init_one,
906 .remove = __devexit_p(synclink_remove_one),
909 static struct tty_driver *serial_driver;
911 /* number of characters left in xmit buffer before we ask for more */
912 #define WAKEUP_CHARS 256
915 static void mgsl_change_params(struct mgsl_struct *info);
916 static void mgsl_wait_until_sent(struct tty_struct *tty, int timeout);
919 * 1st function defined in .text section. Calling this function in
920 * init_module() followed by a breakpoint allows a remote debugger
921 * (gdb) to get the .text address for the add-symbol-file command.
922 * This allows remote debugging of dynamically loadable modules.
924 static void* mgsl_get_text_ptr(void)
926 return mgsl_get_text_ptr;
929 static inline int mgsl_paranoia_check(struct mgsl_struct *info,
930 char *name, const char *routine)
932 #ifdef MGSL_PARANOIA_CHECK
933 static const char *badmagic =
934 "Warning: bad magic number for mgsl struct (%s) in %s\n";
935 static const char *badinfo =
936 "Warning: null mgsl_struct for (%s) in %s\n";
939 printk(badinfo, name, routine);
942 if (info->magic != MGSL_MAGIC) {
943 printk(badmagic, name, routine);
954 * line discipline callback wrappers
956 * The wrappers maintain line discipline references
957 * while calling into the line discipline.
959 * ldisc_receive_buf - pass receive data to line discipline
962 static void ldisc_receive_buf(struct tty_struct *tty,
963 const __u8 *data, char *flags, int count)
965 struct tty_ldisc *ld;
968 ld = tty_ldisc_ref(tty);
970 if (ld->ops->receive_buf)
971 ld->ops->receive_buf(tty, data, flags, count);
976 /* mgsl_stop() throttle (stop) transmitter
978 * Arguments: tty pointer to tty info structure
981 static void mgsl_stop(struct tty_struct *tty)
983 struct mgsl_struct *info = (struct mgsl_struct *)tty->driver_data;
986 if (mgsl_paranoia_check(info, tty->name, "mgsl_stop"))
989 if ( debug_level >= DEBUG_LEVEL_INFO )
990 printk("mgsl_stop(%s)\n",info->device_name);
992 spin_lock_irqsave(&info->irq_spinlock,flags);
993 if (info->tx_enabled)
994 usc_stop_transmitter(info);
995 spin_unlock_irqrestore(&info->irq_spinlock,flags);
997 } /* end of mgsl_stop() */
999 /* mgsl_start() release (start) transmitter
1001 * Arguments: tty pointer to tty info structure
1002 * Return Value: None
1004 static void mgsl_start(struct tty_struct *tty)
1006 struct mgsl_struct *info = (struct mgsl_struct *)tty->driver_data;
1007 unsigned long flags;
1009 if (mgsl_paranoia_check(info, tty->name, "mgsl_start"))
1012 if ( debug_level >= DEBUG_LEVEL_INFO )
1013 printk("mgsl_start(%s)\n",info->device_name);
1015 spin_lock_irqsave(&info->irq_spinlock,flags);
1016 if (!info->tx_enabled)
1017 usc_start_transmitter(info);
1018 spin_unlock_irqrestore(&info->irq_spinlock,flags);
1020 } /* end of mgsl_start() */
1023 * Bottom half work queue access functions
1026 /* mgsl_bh_action() Return next bottom half action to perform.
1027 * Return Value: BH action code or 0 if nothing to do.
1029 static int mgsl_bh_action(struct mgsl_struct *info)
1031 unsigned long flags;
1034 spin_lock_irqsave(&info->irq_spinlock,flags);
1036 if (info->pending_bh & BH_RECEIVE) {
1037 info->pending_bh &= ~BH_RECEIVE;
1039 } else if (info->pending_bh & BH_TRANSMIT) {
1040 info->pending_bh &= ~BH_TRANSMIT;
1042 } else if (info->pending_bh & BH_STATUS) {
1043 info->pending_bh &= ~BH_STATUS;
1048 /* Mark BH routine as complete */
1049 info->bh_running = false;
1050 info->bh_requested = false;
1053 spin_unlock_irqrestore(&info->irq_spinlock,flags);
1059 * Perform bottom half processing of work items queued by ISR.
1061 static void mgsl_bh_handler(struct work_struct *work)
1063 struct mgsl_struct *info =
1064 container_of(work, struct mgsl_struct, task);
1070 if ( debug_level >= DEBUG_LEVEL_BH )
1071 printk( "%s(%d):mgsl_bh_handler(%s) entry\n",
1072 __FILE__,__LINE__,info->device_name);
1074 info->bh_running = true;
1076 while((action = mgsl_bh_action(info)) != 0) {
1078 /* Process work item */
1079 if ( debug_level >= DEBUG_LEVEL_BH )
1080 printk( "%s(%d):mgsl_bh_handler() work item action=%d\n",
1081 __FILE__,__LINE__,action);
1086 mgsl_bh_receive(info);
1089 mgsl_bh_transmit(info);
1092 mgsl_bh_status(info);
1095 /* unknown work item ID */
1096 printk("Unknown work item ID=%08X!\n", action);
1101 if ( debug_level >= DEBUG_LEVEL_BH )
1102 printk( "%s(%d):mgsl_bh_handler(%s) exit\n",
1103 __FILE__,__LINE__,info->device_name);
1106 static void mgsl_bh_receive(struct mgsl_struct *info)
1108 bool (*get_rx_frame)(struct mgsl_struct *info) =
1109 (info->params.mode == MGSL_MODE_HDLC ? mgsl_get_rx_frame : mgsl_get_raw_rx_frame);
1111 if ( debug_level >= DEBUG_LEVEL_BH )
1112 printk( "%s(%d):mgsl_bh_receive(%s)\n",
1113 __FILE__,__LINE__,info->device_name);
1117 if (info->rx_rcc_underrun) {
1118 unsigned long flags;
1119 spin_lock_irqsave(&info->irq_spinlock,flags);
1120 usc_start_receiver(info);
1121 spin_unlock_irqrestore(&info->irq_spinlock,flags);
1124 } while(get_rx_frame(info));
1127 static void mgsl_bh_transmit(struct mgsl_struct *info)
1129 struct tty_struct *tty = info->port.tty;
1130 unsigned long flags;
1132 if ( debug_level >= DEBUG_LEVEL_BH )
1133 printk( "%s(%d):mgsl_bh_transmit() entry on %s\n",
1134 __FILE__,__LINE__,info->device_name);
1139 /* if transmitter idle and loopmode_send_done_requested
1140 * then start echoing RxD to TxD
1142 spin_lock_irqsave(&info->irq_spinlock,flags);
1143 if ( !info->tx_active && info->loopmode_send_done_requested )
1144 usc_loopmode_send_done( info );
1145 spin_unlock_irqrestore(&info->irq_spinlock,flags);
1148 static void mgsl_bh_status(struct mgsl_struct *info)
1150 if ( debug_level >= DEBUG_LEVEL_BH )
1151 printk( "%s(%d):mgsl_bh_status() entry on %s\n",
1152 __FILE__,__LINE__,info->device_name);
1154 info->ri_chkcount = 0;
1155 info->dsr_chkcount = 0;
1156 info->dcd_chkcount = 0;
1157 info->cts_chkcount = 0;
1160 /* mgsl_isr_receive_status()
1162 * Service a receive status interrupt. The type of status
1163 * interrupt is indicated by the state of the RCSR.
1164 * This is only used for HDLC mode.
1166 * Arguments: info pointer to device instance data
1167 * Return Value: None
1169 static void mgsl_isr_receive_status( struct mgsl_struct *info )
1171 u16 status = usc_InReg( info, RCSR );
1173 if ( debug_level >= DEBUG_LEVEL_ISR )
1174 printk("%s(%d):mgsl_isr_receive_status status=%04X\n",
1175 __FILE__,__LINE__,status);
1177 if ( (status & RXSTATUS_ABORT_RECEIVED) &&
1178 info->loopmode_insert_requested &&
1179 usc_loopmode_active(info) )
1181 ++info->icount.rxabort;
1182 info->loopmode_insert_requested = false;
1184 /* clear CMR:13 to start echoing RxD to TxD */
1185 info->cmr_value &= ~BIT13;
1186 usc_OutReg(info, CMR, info->cmr_value);
1188 /* disable received abort irq (no longer required) */
1189 usc_OutReg(info, RICR,
1190 (usc_InReg(info, RICR) & ~RXSTATUS_ABORT_RECEIVED));
1193 if (status & (RXSTATUS_EXITED_HUNT + RXSTATUS_IDLE_RECEIVED)) {
1194 if (status & RXSTATUS_EXITED_HUNT)
1195 info->icount.exithunt++;
1196 if (status & RXSTATUS_IDLE_RECEIVED)
1197 info->icount.rxidle++;
1198 wake_up_interruptible(&info->event_wait_q);
1201 if (status & RXSTATUS_OVERRUN){
1202 info->icount.rxover++;
1203 usc_process_rxoverrun_sync( info );
1206 usc_ClearIrqPendingBits( info, RECEIVE_STATUS );
1207 usc_UnlatchRxstatusBits( info, status );
1209 } /* end of mgsl_isr_receive_status() */
1211 /* mgsl_isr_transmit_status()
1213 * Service a transmit status interrupt
1214 * HDLC mode :end of transmit frame
1215 * Async mode:all data is sent
1216 * transmit status is indicated by bits in the TCSR.
1218 * Arguments: info pointer to device instance data
1219 * Return Value: None
1221 static void mgsl_isr_transmit_status( struct mgsl_struct *info )
1223 u16 status = usc_InReg( info, TCSR );
1225 if ( debug_level >= DEBUG_LEVEL_ISR )
1226 printk("%s(%d):mgsl_isr_transmit_status status=%04X\n",
1227 __FILE__,__LINE__,status);
1229 usc_ClearIrqPendingBits( info, TRANSMIT_STATUS );
1230 usc_UnlatchTxstatusBits( info, status );
1232 if ( status & (TXSTATUS_UNDERRUN | TXSTATUS_ABORT_SENT) )
1234 /* finished sending HDLC abort. This may leave */
1235 /* the TxFifo with data from the aborted frame */
1236 /* so purge the TxFifo. Also shutdown the DMA */
1237 /* channel in case there is data remaining in */
1238 /* the DMA buffer */
1239 usc_DmaCmd( info, DmaCmd_ResetTxChannel );
1240 usc_RTCmd( info, RTCmd_PurgeTxFifo );
1243 if ( status & TXSTATUS_EOF_SENT )
1244 info->icount.txok++;
1245 else if ( status & TXSTATUS_UNDERRUN )
1246 info->icount.txunder++;
1247 else if ( status & TXSTATUS_ABORT_SENT )
1248 info->icount.txabort++;
1250 info->icount.txunder++;
1252 info->tx_active = false;
1253 info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
1254 del_timer(&info->tx_timer);
1256 if ( info->drop_rts_on_tx_done ) {
1257 usc_get_serial_signals( info );
1258 if ( info->serial_signals & SerialSignal_RTS ) {
1259 info->serial_signals &= ~SerialSignal_RTS;
1260 usc_set_serial_signals( info );
1262 info->drop_rts_on_tx_done = false;
1265 #if SYNCLINK_GENERIC_HDLC
1267 hdlcdev_tx_done(info);
1271 if (info->port.tty->stopped || info->port.tty->hw_stopped) {
1272 usc_stop_transmitter(info);
1275 info->pending_bh |= BH_TRANSMIT;
1278 } /* end of mgsl_isr_transmit_status() */
1280 /* mgsl_isr_io_pin()
1282 * Service an Input/Output pin interrupt. The type of
1283 * interrupt is indicated by bits in the MISR
1285 * Arguments: info pointer to device instance data
1286 * Return Value: None
1288 static void mgsl_isr_io_pin( struct mgsl_struct *info )
1290 struct mgsl_icount *icount;
1291 u16 status = usc_InReg( info, MISR );
1293 if ( debug_level >= DEBUG_LEVEL_ISR )
1294 printk("%s(%d):mgsl_isr_io_pin status=%04X\n",
1295 __FILE__,__LINE__,status);
1297 usc_ClearIrqPendingBits( info, IO_PIN );
1298 usc_UnlatchIostatusBits( info, status );
1300 if (status & (MISCSTATUS_CTS_LATCHED | MISCSTATUS_DCD_LATCHED |
1301 MISCSTATUS_DSR_LATCHED | MISCSTATUS_RI_LATCHED) ) {
1302 icount = &info->icount;
1303 /* update input line counters */
1304 if (status & MISCSTATUS_RI_LATCHED) {
1305 if ((info->ri_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1306 usc_DisablestatusIrqs(info,SICR_RI);
1308 if ( status & MISCSTATUS_RI )
1309 info->input_signal_events.ri_up++;
1311 info->input_signal_events.ri_down++;
1313 if (status & MISCSTATUS_DSR_LATCHED) {
1314 if ((info->dsr_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1315 usc_DisablestatusIrqs(info,SICR_DSR);
1317 if ( status & MISCSTATUS_DSR )
1318 info->input_signal_events.dsr_up++;
1320 info->input_signal_events.dsr_down++;
1322 if (status & MISCSTATUS_DCD_LATCHED) {
1323 if ((info->dcd_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1324 usc_DisablestatusIrqs(info,SICR_DCD);
1326 if (status & MISCSTATUS_DCD) {
1327 info->input_signal_events.dcd_up++;
1329 info->input_signal_events.dcd_down++;
1330 #if SYNCLINK_GENERIC_HDLC
1331 if (info->netcount) {
1332 if (status & MISCSTATUS_DCD)
1333 netif_carrier_on(info->netdev);
1335 netif_carrier_off(info->netdev);
1339 if (status & MISCSTATUS_CTS_LATCHED)
1341 if ((info->cts_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1342 usc_DisablestatusIrqs(info,SICR_CTS);
1344 if ( status & MISCSTATUS_CTS )
1345 info->input_signal_events.cts_up++;
1347 info->input_signal_events.cts_down++;
1349 wake_up_interruptible(&info->status_event_wait_q);
1350 wake_up_interruptible(&info->event_wait_q);
1352 if ( (info->port.flags & ASYNC_CHECK_CD) &&
1353 (status & MISCSTATUS_DCD_LATCHED) ) {
1354 if ( debug_level >= DEBUG_LEVEL_ISR )
1355 printk("%s CD now %s...", info->device_name,
1356 (status & MISCSTATUS_DCD) ? "on" : "off");
1357 if (status & MISCSTATUS_DCD)
1358 wake_up_interruptible(&info->port.open_wait);
1360 if ( debug_level >= DEBUG_LEVEL_ISR )
1361 printk("doing serial hangup...");
1363 tty_hangup(info->port.tty);
1367 if ( (info->port.flags & ASYNC_CTS_FLOW) &&
1368 (status & MISCSTATUS_CTS_LATCHED) ) {
1369 if (info->port.tty->hw_stopped) {
1370 if (status & MISCSTATUS_CTS) {
1371 if ( debug_level >= DEBUG_LEVEL_ISR )
1372 printk("CTS tx start...");
1374 info->port.tty->hw_stopped = 0;
1375 usc_start_transmitter(info);
1376 info->pending_bh |= BH_TRANSMIT;
1380 if (!(status & MISCSTATUS_CTS)) {
1381 if ( debug_level >= DEBUG_LEVEL_ISR )
1382 printk("CTS tx stop...");
1384 info->port.tty->hw_stopped = 1;
1385 usc_stop_transmitter(info);
1391 info->pending_bh |= BH_STATUS;
1393 /* for diagnostics set IRQ flag */
1394 if ( status & MISCSTATUS_TXC_LATCHED ){
1395 usc_OutReg( info, SICR,
1396 (unsigned short)(usc_InReg(info,SICR) & ~(SICR_TXC_ACTIVE+SICR_TXC_INACTIVE)) );
1397 usc_UnlatchIostatusBits( info, MISCSTATUS_TXC_LATCHED );
1398 info->irq_occurred = true;
1401 } /* end of mgsl_isr_io_pin() */
1403 /* mgsl_isr_transmit_data()
1405 * Service a transmit data interrupt (async mode only).
1407 * Arguments: info pointer to device instance data
1408 * Return Value: None
1410 static void mgsl_isr_transmit_data( struct mgsl_struct *info )
1412 if ( debug_level >= DEBUG_LEVEL_ISR )
1413 printk("%s(%d):mgsl_isr_transmit_data xmit_cnt=%d\n",
1414 __FILE__,__LINE__,info->xmit_cnt);
1416 usc_ClearIrqPendingBits( info, TRANSMIT_DATA );
1418 if (info->port.tty->stopped || info->port.tty->hw_stopped) {
1419 usc_stop_transmitter(info);
1423 if ( info->xmit_cnt )
1424 usc_load_txfifo( info );
1426 info->tx_active = false;
1428 if (info->xmit_cnt < WAKEUP_CHARS)
1429 info->pending_bh |= BH_TRANSMIT;
1431 } /* end of mgsl_isr_transmit_data() */
1433 /* mgsl_isr_receive_data()
1435 * Service a receive data interrupt. This occurs
1436 * when operating in asynchronous interrupt transfer mode.
1437 * The receive data FIFO is flushed to the receive data buffers.
1439 * Arguments: info pointer to device instance data
1440 * Return Value: None
1442 static void mgsl_isr_receive_data( struct mgsl_struct *info )
1447 unsigned char DataByte;
1448 struct tty_struct *tty = info->port.tty;
1449 struct mgsl_icount *icount = &info->icount;
1451 if ( debug_level >= DEBUG_LEVEL_ISR )
1452 printk("%s(%d):mgsl_isr_receive_data\n",
1455 usc_ClearIrqPendingBits( info, RECEIVE_DATA );
1457 /* select FIFO status for RICR readback */
1458 usc_RCmd( info, RCmd_SelectRicrRxFifostatus );
1460 /* clear the Wordstatus bit so that status readback */
1461 /* only reflects the status of this byte */
1462 usc_OutReg( info, RICR+LSBONLY, (u16)(usc_InReg(info, RICR+LSBONLY) & ~BIT3 ));
1464 /* flush the receive FIFO */
1466 while( (Fifocount = (usc_InReg(info,RICR) >> 8)) ) {
1469 /* read one byte from RxFIFO */
1470 outw( (inw(info->io_base + CCAR) & 0x0780) | (RDR+LSBONLY),
1471 info->io_base + CCAR );
1472 DataByte = inb( info->io_base + CCAR );
1474 /* get the status of the received byte */
1475 status = usc_InReg(info, RCSR);
1476 if ( status & (RXSTATUS_FRAMING_ERROR + RXSTATUS_PARITY_ERROR +
1477 RXSTATUS_OVERRUN + RXSTATUS_BREAK_RECEIVED) )
1478 usc_UnlatchRxstatusBits(info,RXSTATUS_ALL);
1483 if ( status & (RXSTATUS_FRAMING_ERROR + RXSTATUS_PARITY_ERROR +
1484 RXSTATUS_OVERRUN + RXSTATUS_BREAK_RECEIVED) ) {
1485 printk("rxerr=%04X\n",status);
1486 /* update error statistics */
1487 if ( status & RXSTATUS_BREAK_RECEIVED ) {
1488 status &= ~(RXSTATUS_FRAMING_ERROR + RXSTATUS_PARITY_ERROR);
1490 } else if (status & RXSTATUS_PARITY_ERROR)
1492 else if (status & RXSTATUS_FRAMING_ERROR)
1494 else if (status & RXSTATUS_OVERRUN) {
1495 /* must issue purge fifo cmd before */
1496 /* 16C32 accepts more receive chars */
1497 usc_RTCmd(info,RTCmd_PurgeRxFifo);
1501 /* discard char if tty control flags say so */
1502 if (status & info->ignore_status_mask)
1505 status &= info->read_status_mask;
1507 if (status & RXSTATUS_BREAK_RECEIVED) {
1509 if (info->port.flags & ASYNC_SAK)
1511 } else if (status & RXSTATUS_PARITY_ERROR)
1513 else if (status & RXSTATUS_FRAMING_ERROR)
1515 } /* end of if (error) */
1516 tty_insert_flip_char(tty, DataByte, flag);
1517 if (status & RXSTATUS_OVERRUN) {
1518 /* Overrun is special, since it's
1519 * reported immediately, and doesn't
1520 * affect the current character
1522 work += tty_insert_flip_char(tty, 0, TTY_OVERRUN);
1526 if ( debug_level >= DEBUG_LEVEL_ISR ) {
1527 printk("%s(%d):rx=%d brk=%d parity=%d frame=%d overrun=%d\n",
1528 __FILE__,__LINE__,icount->rx,icount->brk,
1529 icount->parity,icount->frame,icount->overrun);
1533 tty_flip_buffer_push(tty);
1538 * Service a miscellaneous interrupt source.
1540 * Arguments: info pointer to device extension (instance data)
1541 * Return Value: None
1543 static void mgsl_isr_misc( struct mgsl_struct *info )
1545 u16 status = usc_InReg( info, MISR );
1547 if ( debug_level >= DEBUG_LEVEL_ISR )
1548 printk("%s(%d):mgsl_isr_misc status=%04X\n",
1549 __FILE__,__LINE__,status);
1551 if ((status & MISCSTATUS_RCC_UNDERRUN) &&
1552 (info->params.mode == MGSL_MODE_HDLC)) {
1554 /* turn off receiver and rx DMA */
1555 usc_EnableReceiver(info,DISABLE_UNCONDITIONAL);
1556 usc_DmaCmd(info, DmaCmd_ResetRxChannel);
1557 usc_UnlatchRxstatusBits(info, RXSTATUS_ALL);
1558 usc_ClearIrqPendingBits(info, RECEIVE_DATA + RECEIVE_STATUS);
1559 usc_DisableInterrupts(info, RECEIVE_DATA + RECEIVE_STATUS);
1561 /* schedule BH handler to restart receiver */
1562 info->pending_bh |= BH_RECEIVE;
1563 info->rx_rcc_underrun = true;
1566 usc_ClearIrqPendingBits( info, MISC );
1567 usc_UnlatchMiscstatusBits( info, status );
1569 } /* end of mgsl_isr_misc() */
1573 * Services undefined interrupt vectors from the
1574 * USC. (hence this function SHOULD never be called)
1576 * Arguments: info pointer to device extension (instance data)
1577 * Return Value: None
1579 static void mgsl_isr_null( struct mgsl_struct *info )
1582 } /* end of mgsl_isr_null() */
1584 /* mgsl_isr_receive_dma()
1586 * Service a receive DMA channel interrupt.
1587 * For this driver there are two sources of receive DMA interrupts
1588 * as identified in the Receive DMA mode Register (RDMR):
1590 * BIT3 EOA/EOL End of List, all receive buffers in receive
1591 * buffer list have been filled (no more free buffers
1592 * available). The DMA controller has shut down.
1594 * BIT2 EOB End of Buffer. This interrupt occurs when a receive
1595 * DMA buffer is terminated in response to completion
1596 * of a good frame or a frame with errors. The status
1597 * of the frame is stored in the buffer entry in the
1598 * list of receive buffer entries.
1600 * Arguments: info pointer to device instance data
1601 * Return Value: None
1603 static void mgsl_isr_receive_dma( struct mgsl_struct *info )
1607 /* clear interrupt pending and IUS bit for Rx DMA IRQ */
1608 usc_OutDmaReg( info, CDIR, BIT9+BIT1 );
1610 /* Read the receive DMA status to identify interrupt type. */
1611 /* This also clears the status bits. */
1612 status = usc_InDmaReg( info, RDMR );
1614 if ( debug_level >= DEBUG_LEVEL_ISR )
1615 printk("%s(%d):mgsl_isr_receive_dma(%s) status=%04X\n",
1616 __FILE__,__LINE__,info->device_name,status);
1618 info->pending_bh |= BH_RECEIVE;
1620 if ( status & BIT3 ) {
1621 info->rx_overflow = true;
1622 info->icount.buf_overrun++;
1625 } /* end of mgsl_isr_receive_dma() */
1627 /* mgsl_isr_transmit_dma()
1629 * This function services a transmit DMA channel interrupt.
1631 * For this driver there is one source of transmit DMA interrupts
1632 * as identified in the Transmit DMA Mode Register (TDMR):
1634 * BIT2 EOB End of Buffer. This interrupt occurs when a
1635 * transmit DMA buffer has been emptied.
1637 * The driver maintains enough transmit DMA buffers to hold at least
1638 * one max frame size transmit frame. When operating in a buffered
1639 * transmit mode, there may be enough transmit DMA buffers to hold at
1640 * least two or more max frame size frames. On an EOB condition,
1641 * determine if there are any queued transmit buffers and copy into
1642 * transmit DMA buffers if we have room.
1644 * Arguments: info pointer to device instance data
1645 * Return Value: None
1647 static void mgsl_isr_transmit_dma( struct mgsl_struct *info )
1651 /* clear interrupt pending and IUS bit for Tx DMA IRQ */
1652 usc_OutDmaReg(info, CDIR, BIT8+BIT0 );
1654 /* Read the transmit DMA status to identify interrupt type. */
1655 /* This also clears the status bits. */
1657 status = usc_InDmaReg( info, TDMR );
1659 if ( debug_level >= DEBUG_LEVEL_ISR )
1660 printk("%s(%d):mgsl_isr_transmit_dma(%s) status=%04X\n",
1661 __FILE__,__LINE__,info->device_name,status);
1663 if ( status & BIT2 ) {
1664 --info->tx_dma_buffers_used;
1666 /* if there are transmit frames queued,
1667 * try to load the next one
1669 if ( load_next_tx_holding_buffer(info) ) {
1670 /* if call returns non-zero value, we have
1671 * at least one free tx holding buffer
1673 info->pending_bh |= BH_TRANSMIT;
1677 } /* end of mgsl_isr_transmit_dma() */
1681 * Interrupt service routine entry point.
1685 * irq interrupt number that caused interrupt
1686 * dev_id device ID supplied during interrupt registration
1688 * Return Value: None
1690 static irqreturn_t mgsl_interrupt(int dummy, void *dev_id)
1692 struct mgsl_struct *info = dev_id;
1696 if ( debug_level >= DEBUG_LEVEL_ISR )
1697 printk(KERN_DEBUG "%s(%d):mgsl_interrupt(%d)entry.\n",
1698 __FILE__, __LINE__, info->irq_level);
1700 spin_lock(&info->irq_spinlock);
1703 /* Read the interrupt vectors from hardware. */
1704 UscVector = usc_InReg(info, IVR) >> 9;
1705 DmaVector = usc_InDmaReg(info, DIVR);
1707 if ( debug_level >= DEBUG_LEVEL_ISR )
1708 printk("%s(%d):%s UscVector=%08X DmaVector=%08X\n",
1709 __FILE__,__LINE__,info->device_name,UscVector,DmaVector);
1711 if ( !UscVector && !DmaVector )
1714 /* Dispatch interrupt vector */
1716 (*UscIsrTable[UscVector])(info);
1717 else if ( (DmaVector&(BIT10|BIT9)) == BIT10)
1718 mgsl_isr_transmit_dma(info);
1720 mgsl_isr_receive_dma(info);
1722 if ( info->isr_overflow ) {
1723 printk(KERN_ERR "%s(%d):%s isr overflow irq=%d\n",
1724 __FILE__, __LINE__, info->device_name, info->irq_level);
1725 usc_DisableMasterIrqBit(info);
1726 usc_DisableDmaInterrupts(info,DICR_MASTER);
1731 /* Request bottom half processing if there's something
1732 * for it to do and the bh is not already running
1735 if ( info->pending_bh && !info->bh_running && !info->bh_requested ) {
1736 if ( debug_level >= DEBUG_LEVEL_ISR )
1737 printk("%s(%d):%s queueing bh task.\n",
1738 __FILE__,__LINE__,info->device_name);
1739 schedule_work(&info->task);
1740 info->bh_requested = true;
1743 spin_unlock(&info->irq_spinlock);
1745 if ( debug_level >= DEBUG_LEVEL_ISR )
1746 printk(KERN_DEBUG "%s(%d):mgsl_interrupt(%d)exit.\n",
1747 __FILE__, __LINE__, info->irq_level);
1750 } /* end of mgsl_interrupt() */
1754 * Initialize and start device.
1756 * Arguments: info pointer to device instance data
1757 * Return Value: 0 if success, otherwise error code
1759 static int startup(struct mgsl_struct * info)
1763 if ( debug_level >= DEBUG_LEVEL_INFO )
1764 printk("%s(%d):mgsl_startup(%s)\n",__FILE__,__LINE__,info->device_name);
1766 if (info->port.flags & ASYNC_INITIALIZED)
1769 if (!info->xmit_buf) {
1770 /* allocate a page of memory for a transmit buffer */
1771 info->xmit_buf = (unsigned char *)get_zeroed_page(GFP_KERNEL);
1772 if (!info->xmit_buf) {
1773 printk(KERN_ERR"%s(%d):%s can't allocate transmit buffer\n",
1774 __FILE__,__LINE__,info->device_name);
1779 info->pending_bh = 0;
1781 memset(&info->icount, 0, sizeof(info->icount));
1783 setup_timer(&info->tx_timer, mgsl_tx_timeout, (unsigned long)info);
1785 /* Allocate and claim adapter resources */
1786 retval = mgsl_claim_resources(info);
1788 /* perform existence check and diagnostics */
1790 retval = mgsl_adapter_test(info);
1793 if (capable(CAP_SYS_ADMIN) && info->port.tty)
1794 set_bit(TTY_IO_ERROR, &info->port.tty->flags);
1795 mgsl_release_resources(info);
1799 /* program hardware for current parameters */
1800 mgsl_change_params(info);
1803 clear_bit(TTY_IO_ERROR, &info->port.tty->flags);
1805 info->port.flags |= ASYNC_INITIALIZED;
1809 } /* end of startup() */
1813 * Called by mgsl_close() and mgsl_hangup() to shutdown hardware
1815 * Arguments: info pointer to device instance data
1816 * Return Value: None
1818 static void shutdown(struct mgsl_struct * info)
1820 unsigned long flags;
1822 if (!(info->port.flags & ASYNC_INITIALIZED))
1825 if (debug_level >= DEBUG_LEVEL_INFO)
1826 printk("%s(%d):mgsl_shutdown(%s)\n",
1827 __FILE__,__LINE__, info->device_name );
1829 /* clear status wait queue because status changes */
1830 /* can't happen after shutting down the hardware */
1831 wake_up_interruptible(&info->status_event_wait_q);
1832 wake_up_interruptible(&info->event_wait_q);
1834 del_timer_sync(&info->tx_timer);
1836 if (info->xmit_buf) {
1837 free_page((unsigned long) info->xmit_buf);
1838 info->xmit_buf = NULL;
1841 spin_lock_irqsave(&info->irq_spinlock,flags);
1842 usc_DisableMasterIrqBit(info);
1843 usc_stop_receiver(info);
1844 usc_stop_transmitter(info);
1845 usc_DisableInterrupts(info,RECEIVE_DATA + RECEIVE_STATUS +
1846 TRANSMIT_DATA + TRANSMIT_STATUS + IO_PIN + MISC );
1847 usc_DisableDmaInterrupts(info,DICR_MASTER + DICR_TRANSMIT + DICR_RECEIVE);
1849 /* Disable DMAEN (Port 7, Bit 14) */
1850 /* This disconnects the DMA request signal from the ISA bus */
1851 /* on the ISA adapter. This has no effect for the PCI adapter */
1852 usc_OutReg(info, PCR, (u16)((usc_InReg(info, PCR) | BIT15) | BIT14));
1854 /* Disable INTEN (Port 6, Bit12) */
1855 /* This disconnects the IRQ request signal to the ISA bus */
1856 /* on the ISA adapter. This has no effect for the PCI adapter */
1857 usc_OutReg(info, PCR, (u16)((usc_InReg(info, PCR) | BIT13) | BIT12));
1859 if (!info->port.tty || info->port.tty->termios->c_cflag & HUPCL) {
1860 info->serial_signals &= ~(SerialSignal_DTR + SerialSignal_RTS);
1861 usc_set_serial_signals(info);
1864 spin_unlock_irqrestore(&info->irq_spinlock,flags);
1866 mgsl_release_resources(info);
1869 set_bit(TTY_IO_ERROR, &info->port.tty->flags);
1871 info->port.flags &= ~ASYNC_INITIALIZED;
1873 } /* end of shutdown() */
1875 static void mgsl_program_hw(struct mgsl_struct *info)
1877 unsigned long flags;
1879 spin_lock_irqsave(&info->irq_spinlock,flags);
1881 usc_stop_receiver(info);
1882 usc_stop_transmitter(info);
1883 info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
1885 if (info->params.mode == MGSL_MODE_HDLC ||
1886 info->params.mode == MGSL_MODE_RAW ||
1888 usc_set_sync_mode(info);
1890 usc_set_async_mode(info);
1892 usc_set_serial_signals(info);
1894 info->dcd_chkcount = 0;
1895 info->cts_chkcount = 0;
1896 info->ri_chkcount = 0;
1897 info->dsr_chkcount = 0;
1899 usc_EnableStatusIrqs(info,SICR_CTS+SICR_DSR+SICR_DCD+SICR_RI);
1900 usc_EnableInterrupts(info, IO_PIN);
1901 usc_get_serial_signals(info);
1903 if (info->netcount || info->port.tty->termios->c_cflag & CREAD)
1904 usc_start_receiver(info);
1906 spin_unlock_irqrestore(&info->irq_spinlock,flags);
1909 /* Reconfigure adapter based on new parameters
1911 static void mgsl_change_params(struct mgsl_struct *info)
1916 if (!info->port.tty || !info->port.tty->termios)
1919 if (debug_level >= DEBUG_LEVEL_INFO)
1920 printk("%s(%d):mgsl_change_params(%s)\n",
1921 __FILE__,__LINE__, info->device_name );
1923 cflag = info->port.tty->termios->c_cflag;
1925 /* if B0 rate (hangup) specified then negate DTR and RTS */
1926 /* otherwise assert DTR and RTS */
1928 info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
1930 info->serial_signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
1932 /* byte size and parity */
1934 switch (cflag & CSIZE) {
1935 case CS5: info->params.data_bits = 5; break;
1936 case CS6: info->params.data_bits = 6; break;
1937 case CS7: info->params.data_bits = 7; break;
1938 case CS8: info->params.data_bits = 8; break;
1939 /* Never happens, but GCC is too dumb to figure it out */
1940 default: info->params.data_bits = 7; break;
1944 info->params.stop_bits = 2;
1946 info->params.stop_bits = 1;
1948 info->params.parity = ASYNC_PARITY_NONE;
1949 if (cflag & PARENB) {
1951 info->params.parity = ASYNC_PARITY_ODD;
1953 info->params.parity = ASYNC_PARITY_EVEN;
1956 info->params.parity = ASYNC_PARITY_SPACE;
1960 /* calculate number of jiffies to transmit a full
1961 * FIFO (32 bytes) at specified data rate
1963 bits_per_char = info->params.data_bits +
1964 info->params.stop_bits + 1;
1966 /* if port data rate is set to 460800 or less then
1967 * allow tty settings to override, otherwise keep the
1968 * current data rate.
1970 if (info->params.data_rate <= 460800)
1971 info->params.data_rate = tty_get_baud_rate(info->port.tty);
1973 if ( info->params.data_rate ) {
1974 info->timeout = (32*HZ*bits_per_char) /
1975 info->params.data_rate;
1977 info->timeout += HZ/50; /* Add .02 seconds of slop */
1979 if (cflag & CRTSCTS)
1980 info->port.flags |= ASYNC_CTS_FLOW;
1982 info->port.flags &= ~ASYNC_CTS_FLOW;
1985 info->port.flags &= ~ASYNC_CHECK_CD;
1987 info->port.flags |= ASYNC_CHECK_CD;
1989 /* process tty input control flags */
1991 info->read_status_mask = RXSTATUS_OVERRUN;
1992 if (I_INPCK(info->port.tty))
1993 info->read_status_mask |= RXSTATUS_PARITY_ERROR | RXSTATUS_FRAMING_ERROR;
1994 if (I_BRKINT(info->port.tty) || I_PARMRK(info->port.tty))
1995 info->read_status_mask |= RXSTATUS_BREAK_RECEIVED;
1997 if (I_IGNPAR(info->port.tty))
1998 info->ignore_status_mask |= RXSTATUS_PARITY_ERROR | RXSTATUS_FRAMING_ERROR;
1999 if (I_IGNBRK(info->port.tty)) {
2000 info->ignore_status_mask |= RXSTATUS_BREAK_RECEIVED;
2001 /* If ignoring parity and break indicators, ignore
2002 * overruns too. (For real raw support).
2004 if (I_IGNPAR(info->port.tty))
2005 info->ignore_status_mask |= RXSTATUS_OVERRUN;
2008 mgsl_program_hw(info);
2010 } /* end of mgsl_change_params() */
2014 * Add a character to the transmit buffer.
2016 * Arguments: tty pointer to tty information structure
2017 * ch character to add to transmit buffer
2019 * Return Value: None
2021 static int mgsl_put_char(struct tty_struct *tty, unsigned char ch)
2023 struct mgsl_struct *info = tty->driver_data;
2024 unsigned long flags;
2027 if (debug_level >= DEBUG_LEVEL_INFO) {
2028 printk(KERN_DEBUG "%s(%d):mgsl_put_char(%d) on %s\n",
2029 __FILE__, __LINE__, ch, info->device_name);
2032 if (mgsl_paranoia_check(info, tty->name, "mgsl_put_char"))
2035 if (!tty || !info->xmit_buf)
2038 spin_lock_irqsave(&info->irq_spinlock, flags);
2040 if ((info->params.mode == MGSL_MODE_ASYNC ) || !info->tx_active) {
2041 if (info->xmit_cnt < SERIAL_XMIT_SIZE - 1) {
2042 info->xmit_buf[info->xmit_head++] = ch;
2043 info->xmit_head &= SERIAL_XMIT_SIZE-1;
2048 spin_unlock_irqrestore(&info->irq_spinlock, flags);
2051 } /* end of mgsl_put_char() */
2053 /* mgsl_flush_chars()
2055 * Enable transmitter so remaining characters in the
2056 * transmit buffer are sent.
2058 * Arguments: tty pointer to tty information structure
2059 * Return Value: None
2061 static void mgsl_flush_chars(struct tty_struct *tty)
2063 struct mgsl_struct *info = (struct mgsl_struct *)tty->driver_data;
2064 unsigned long flags;
2066 if ( debug_level >= DEBUG_LEVEL_INFO )
2067 printk( "%s(%d):mgsl_flush_chars() entry on %s xmit_cnt=%d\n",
2068 __FILE__,__LINE__,info->device_name,info->xmit_cnt);
2070 if (mgsl_paranoia_check(info, tty->name, "mgsl_flush_chars"))
2073 if (info->xmit_cnt <= 0 || tty->stopped || tty->hw_stopped ||
2077 if ( debug_level >= DEBUG_LEVEL_INFO )
2078 printk( "%s(%d):mgsl_flush_chars() entry on %s starting transmitter\n",
2079 __FILE__,__LINE__,info->device_name );
2081 spin_lock_irqsave(&info->irq_spinlock,flags);
2083 if (!info->tx_active) {
2084 if ( (info->params.mode == MGSL_MODE_HDLC ||
2085 info->params.mode == MGSL_MODE_RAW) && info->xmit_cnt ) {
2086 /* operating in synchronous (frame oriented) mode */
2087 /* copy data from circular xmit_buf to */
2088 /* transmit DMA buffer. */
2089 mgsl_load_tx_dma_buffer(info,
2090 info->xmit_buf,info->xmit_cnt);
2092 usc_start_transmitter(info);
2095 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2097 } /* end of mgsl_flush_chars() */
2101 * Send a block of data
2105 * tty pointer to tty information structure
2106 * buf pointer to buffer containing send data
2107 * count size of send data in bytes
2109 * Return Value: number of characters written
2111 static int mgsl_write(struct tty_struct * tty,
2112 const unsigned char *buf, int count)
2115 struct mgsl_struct *info = (struct mgsl_struct *)tty->driver_data;
2116 unsigned long flags;
2118 if ( debug_level >= DEBUG_LEVEL_INFO )
2119 printk( "%s(%d):mgsl_write(%s) count=%d\n",
2120 __FILE__,__LINE__,info->device_name,count);
2122 if (mgsl_paranoia_check(info, tty->name, "mgsl_write"))
2125 if (!tty || !info->xmit_buf)
2128 if ( info->params.mode == MGSL_MODE_HDLC ||
2129 info->params.mode == MGSL_MODE_RAW ) {
2130 /* operating in synchronous (frame oriented) mode */
2131 /* operating in synchronous (frame oriented) mode */
2132 if (info->tx_active) {
2134 if ( info->params.mode == MGSL_MODE_HDLC ) {
2138 /* transmitter is actively sending data -
2139 * if we have multiple transmit dma and
2140 * holding buffers, attempt to queue this
2141 * frame for transmission at a later time.
2143 if (info->tx_holding_count >= info->num_tx_holding_buffers ) {
2144 /* no tx holding buffers available */
2149 /* queue transmit frame request */
2151 save_tx_buffer_request(info,buf,count);
2153 /* if we have sufficient tx dma buffers,
2154 * load the next buffered tx request
2156 spin_lock_irqsave(&info->irq_spinlock,flags);
2157 load_next_tx_holding_buffer(info);
2158 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2162 /* if operating in HDLC LoopMode and the adapter */
2163 /* has yet to be inserted into the loop, we can't */
2166 if ( (info->params.flags & HDLC_FLAG_HDLC_LOOPMODE) &&
2167 !usc_loopmode_active(info) )
2173 if ( info->xmit_cnt ) {
2174 /* Send accumulated from send_char() calls */
2175 /* as frame and wait before accepting more data. */
2178 /* copy data from circular xmit_buf to */
2179 /* transmit DMA buffer. */
2180 mgsl_load_tx_dma_buffer(info,
2181 info->xmit_buf,info->xmit_cnt);
2182 if ( debug_level >= DEBUG_LEVEL_INFO )
2183 printk( "%s(%d):mgsl_write(%s) sync xmit_cnt flushing\n",
2184 __FILE__,__LINE__,info->device_name);
2186 if ( debug_level >= DEBUG_LEVEL_INFO )
2187 printk( "%s(%d):mgsl_write(%s) sync transmit accepted\n",
2188 __FILE__,__LINE__,info->device_name);
2190 info->xmit_cnt = count;
2191 mgsl_load_tx_dma_buffer(info,buf,count);
2195 spin_lock_irqsave(&info->irq_spinlock,flags);
2196 c = min_t(int, count,
2197 min(SERIAL_XMIT_SIZE - info->xmit_cnt - 1,
2198 SERIAL_XMIT_SIZE - info->xmit_head));
2200 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2203 memcpy(info->xmit_buf + info->xmit_head, buf, c);
2204 info->xmit_head = ((info->xmit_head + c) &
2205 (SERIAL_XMIT_SIZE-1));
2206 info->xmit_cnt += c;
2207 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2214 if (info->xmit_cnt && !tty->stopped && !tty->hw_stopped) {
2215 spin_lock_irqsave(&info->irq_spinlock,flags);
2216 if (!info->tx_active)
2217 usc_start_transmitter(info);
2218 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2221 if ( debug_level >= DEBUG_LEVEL_INFO )
2222 printk( "%s(%d):mgsl_write(%s) returning=%d\n",
2223 __FILE__,__LINE__,info->device_name,ret);
2227 } /* end of mgsl_write() */
2229 /* mgsl_write_room()
2231 * Return the count of free bytes in transmit buffer
2233 * Arguments: tty pointer to tty info structure
2234 * Return Value: None
2236 static int mgsl_write_room(struct tty_struct *tty)
2238 struct mgsl_struct *info = (struct mgsl_struct *)tty->driver_data;
2241 if (mgsl_paranoia_check(info, tty->name, "mgsl_write_room"))
2243 ret = SERIAL_XMIT_SIZE - info->xmit_cnt - 1;
2247 if (debug_level >= DEBUG_LEVEL_INFO)
2248 printk("%s(%d):mgsl_write_room(%s)=%d\n",
2249 __FILE__,__LINE__, info->device_name,ret );
2251 if ( info->params.mode == MGSL_MODE_HDLC ||
2252 info->params.mode == MGSL_MODE_RAW ) {
2253 /* operating in synchronous (frame oriented) mode */
2254 if ( info->tx_active )
2257 return HDLC_MAX_FRAME_SIZE;
2262 } /* end of mgsl_write_room() */
2264 /* mgsl_chars_in_buffer()
2266 * Return the count of bytes in transmit buffer
2268 * Arguments: tty pointer to tty info structure
2269 * Return Value: None
2271 static int mgsl_chars_in_buffer(struct tty_struct *tty)
2273 struct mgsl_struct *info = (struct mgsl_struct *)tty->driver_data;
2275 if (debug_level >= DEBUG_LEVEL_INFO)
2276 printk("%s(%d):mgsl_chars_in_buffer(%s)\n",
2277 __FILE__,__LINE__, info->device_name );
2279 if (mgsl_paranoia_check(info, tty->name, "mgsl_chars_in_buffer"))
2282 if (debug_level >= DEBUG_LEVEL_INFO)
2283 printk("%s(%d):mgsl_chars_in_buffer(%s)=%d\n",
2284 __FILE__,__LINE__, info->device_name,info->xmit_cnt );
2286 if ( info->params.mode == MGSL_MODE_HDLC ||
2287 info->params.mode == MGSL_MODE_RAW ) {
2288 /* operating in synchronous (frame oriented) mode */
2289 if ( info->tx_active )
2290 return info->max_frame_size;
2295 return info->xmit_cnt;
2296 } /* end of mgsl_chars_in_buffer() */
2298 /* mgsl_flush_buffer()
2300 * Discard all data in the send buffer
2302 * Arguments: tty pointer to tty info structure
2303 * Return Value: None
2305 static void mgsl_flush_buffer(struct tty_struct *tty)
2307 struct mgsl_struct *info = (struct mgsl_struct *)tty->driver_data;
2308 unsigned long flags;
2310 if (debug_level >= DEBUG_LEVEL_INFO)
2311 printk("%s(%d):mgsl_flush_buffer(%s) entry\n",
2312 __FILE__,__LINE__, info->device_name );
2314 if (mgsl_paranoia_check(info, tty->name, "mgsl_flush_buffer"))
2317 spin_lock_irqsave(&info->irq_spinlock,flags);
2318 info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
2319 del_timer(&info->tx_timer);
2320 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2325 /* mgsl_send_xchar()
2327 * Send a high-priority XON/XOFF character
2329 * Arguments: tty pointer to tty info structure
2330 * ch character to send
2331 * Return Value: None
2333 static void mgsl_send_xchar(struct tty_struct *tty, char ch)
2335 struct mgsl_struct *info = (struct mgsl_struct *)tty->driver_data;
2336 unsigned long flags;
2338 if (debug_level >= DEBUG_LEVEL_INFO)
2339 printk("%s(%d):mgsl_send_xchar(%s,%d)\n",
2340 __FILE__,__LINE__, info->device_name, ch );
2342 if (mgsl_paranoia_check(info, tty->name, "mgsl_send_xchar"))
2347 /* Make sure transmit interrupts are on */
2348 spin_lock_irqsave(&info->irq_spinlock,flags);
2349 if (!info->tx_enabled)
2350 usc_start_transmitter(info);
2351 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2353 } /* end of mgsl_send_xchar() */
2357 * Signal remote device to throttle send data (our receive data)
2359 * Arguments: tty pointer to tty info structure
2360 * Return Value: None
2362 static void mgsl_throttle(struct tty_struct * tty)
2364 struct mgsl_struct *info = (struct mgsl_struct *)tty->driver_data;
2365 unsigned long flags;
2367 if (debug_level >= DEBUG_LEVEL_INFO)
2368 printk("%s(%d):mgsl_throttle(%s) entry\n",
2369 __FILE__,__LINE__, info->device_name );
2371 if (mgsl_paranoia_check(info, tty->name, "mgsl_throttle"))
2375 mgsl_send_xchar(tty, STOP_CHAR(tty));
2377 if (tty->termios->c_cflag & CRTSCTS) {
2378 spin_lock_irqsave(&info->irq_spinlock,flags);
2379 info->serial_signals &= ~SerialSignal_RTS;
2380 usc_set_serial_signals(info);
2381 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2383 } /* end of mgsl_throttle() */
2385 /* mgsl_unthrottle()
2387 * Signal remote device to stop throttling send data (our receive data)
2389 * Arguments: tty pointer to tty info structure
2390 * Return Value: None
2392 static void mgsl_unthrottle(struct tty_struct * tty)
2394 struct mgsl_struct *info = (struct mgsl_struct *)tty->driver_data;
2395 unsigned long flags;
2397 if (debug_level >= DEBUG_LEVEL_INFO)
2398 printk("%s(%d):mgsl_unthrottle(%s) entry\n",
2399 __FILE__,__LINE__, info->device_name );
2401 if (mgsl_paranoia_check(info, tty->name, "mgsl_unthrottle"))
2408 mgsl_send_xchar(tty, START_CHAR(tty));
2411 if (tty->termios->c_cflag & CRTSCTS) {
2412 spin_lock_irqsave(&info->irq_spinlock,flags);
2413 info->serial_signals |= SerialSignal_RTS;
2414 usc_set_serial_signals(info);
2415 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2418 } /* end of mgsl_unthrottle() */
2422 * get the current serial parameters information
2424 * Arguments: info pointer to device instance data
2425 * user_icount pointer to buffer to hold returned stats
2427 * Return Value: 0 if success, otherwise error code
2429 static int mgsl_get_stats(struct mgsl_struct * info, struct mgsl_icount __user *user_icount)
2433 if (debug_level >= DEBUG_LEVEL_INFO)
2434 printk("%s(%d):mgsl_get_params(%s)\n",
2435 __FILE__,__LINE__, info->device_name);
2438 memset(&info->icount, 0, sizeof(info->icount));
2440 COPY_TO_USER(err, user_icount, &info->icount, sizeof(struct mgsl_icount));
2447 } /* end of mgsl_get_stats() */
2449 /* mgsl_get_params()
2451 * get the current serial parameters information
2453 * Arguments: info pointer to device instance data
2454 * user_params pointer to buffer to hold returned params
2456 * Return Value: 0 if success, otherwise error code
2458 static int mgsl_get_params(struct mgsl_struct * info, MGSL_PARAMS __user *user_params)
2461 if (debug_level >= DEBUG_LEVEL_INFO)
2462 printk("%s(%d):mgsl_get_params(%s)\n",
2463 __FILE__,__LINE__, info->device_name);
2465 COPY_TO_USER(err,user_params, &info->params, sizeof(MGSL_PARAMS));
2467 if ( debug_level >= DEBUG_LEVEL_INFO )
2468 printk( "%s(%d):mgsl_get_params(%s) user buffer copy failed\n",
2469 __FILE__,__LINE__,info->device_name);
2475 } /* end of mgsl_get_params() */
2477 /* mgsl_set_params()
2479 * set the serial parameters
2483 * info pointer to device instance data
2484 * new_params user buffer containing new serial params
2486 * Return Value: 0 if success, otherwise error code
2488 static int mgsl_set_params(struct mgsl_struct * info, MGSL_PARAMS __user *new_params)
2490 unsigned long flags;
2491 MGSL_PARAMS tmp_params;
2494 if (debug_level >= DEBUG_LEVEL_INFO)
2495 printk("%s(%d):mgsl_set_params %s\n", __FILE__,__LINE__,
2496 info->device_name );
2497 COPY_FROM_USER(err,&tmp_params, new_params, sizeof(MGSL_PARAMS));
2499 if ( debug_level >= DEBUG_LEVEL_INFO )
2500 printk( "%s(%d):mgsl_set_params(%s) user buffer copy failed\n",
2501 __FILE__,__LINE__,info->device_name);
2505 spin_lock_irqsave(&info->irq_spinlock,flags);
2506 memcpy(&info->params,&tmp_params,sizeof(MGSL_PARAMS));
2507 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2509 mgsl_change_params(info);
2513 } /* end of mgsl_set_params() */
2515 /* mgsl_get_txidle()
2517 * get the current transmit idle mode
2519 * Arguments: info pointer to device instance data
2520 * idle_mode pointer to buffer to hold returned idle mode
2522 * Return Value: 0 if success, otherwise error code
2524 static int mgsl_get_txidle(struct mgsl_struct * info, int __user *idle_mode)
2528 if (debug_level >= DEBUG_LEVEL_INFO)
2529 printk("%s(%d):mgsl_get_txidle(%s)=%d\n",
2530 __FILE__,__LINE__, info->device_name, info->idle_mode);
2532 COPY_TO_USER(err,idle_mode, &info->idle_mode, sizeof(int));
2534 if ( debug_level >= DEBUG_LEVEL_INFO )
2535 printk( "%s(%d):mgsl_get_txidle(%s) user buffer copy failed\n",
2536 __FILE__,__LINE__,info->device_name);
2542 } /* end of mgsl_get_txidle() */
2544 /* mgsl_set_txidle() service ioctl to set transmit idle mode
2546 * Arguments: info pointer to device instance data
2547 * idle_mode new idle mode
2549 * Return Value: 0 if success, otherwise error code
2551 static int mgsl_set_txidle(struct mgsl_struct * info, int idle_mode)
2553 unsigned long flags;
2555 if (debug_level >= DEBUG_LEVEL_INFO)
2556 printk("%s(%d):mgsl_set_txidle(%s,%d)\n", __FILE__,__LINE__,
2557 info->device_name, idle_mode );
2559 spin_lock_irqsave(&info->irq_spinlock,flags);
2560 info->idle_mode = idle_mode;
2561 usc_set_txidle( info );
2562 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2565 } /* end of mgsl_set_txidle() */
2569 * enable or disable the transmitter
2573 * info pointer to device instance data
2574 * enable 1 = enable, 0 = disable
2576 * Return Value: 0 if success, otherwise error code
2578 static int mgsl_txenable(struct mgsl_struct * info, int enable)
2580 unsigned long flags;
2582 if (debug_level >= DEBUG_LEVEL_INFO)
2583 printk("%s(%d):mgsl_txenable(%s,%d)\n", __FILE__,__LINE__,
2584 info->device_name, enable);
2586 spin_lock_irqsave(&info->irq_spinlock,flags);
2588 if ( !info->tx_enabled ) {
2590 usc_start_transmitter(info);
2591 /*--------------------------------------------------
2592 * if HDLC/SDLC Loop mode, attempt to insert the
2593 * station in the 'loop' by setting CMR:13. Upon
2594 * receipt of the next GoAhead (RxAbort) sequence,
2595 * the OnLoop indicator (CCSR:7) should go active
2596 * to indicate that we are on the loop
2597 *--------------------------------------------------*/
2598 if ( info->params.flags & HDLC_FLAG_HDLC_LOOPMODE )
2599 usc_loopmode_insert_request( info );
2602 if ( info->tx_enabled )
2603 usc_stop_transmitter(info);
2605 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2608 } /* end of mgsl_txenable() */
2610 /* mgsl_txabort() abort send HDLC frame
2612 * Arguments: info pointer to device instance data
2613 * Return Value: 0 if success, otherwise error code
2615 static int mgsl_txabort(struct mgsl_struct * info)
2617 unsigned long flags;
2619 if (debug_level >= DEBUG_LEVEL_INFO)
2620 printk("%s(%d):mgsl_txabort(%s)\n", __FILE__,__LINE__,
2623 spin_lock_irqsave(&info->irq_spinlock,flags);
2624 if ( info->tx_active && info->params.mode == MGSL_MODE_HDLC )
2626 if ( info->params.flags & HDLC_FLAG_HDLC_LOOPMODE )
2627 usc_loopmode_cancel_transmit( info );
2629 usc_TCmd(info,TCmd_SendAbort);
2631 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2634 } /* end of mgsl_txabort() */
2636 /* mgsl_rxenable() enable or disable the receiver
2638 * Arguments: info pointer to device instance data
2639 * enable 1 = enable, 0 = disable
2640 * Return Value: 0 if success, otherwise error code
2642 static int mgsl_rxenable(struct mgsl_struct * info, int enable)
2644 unsigned long flags;
2646 if (debug_level >= DEBUG_LEVEL_INFO)
2647 printk("%s(%d):mgsl_rxenable(%s,%d)\n", __FILE__,__LINE__,
2648 info->device_name, enable);
2650 spin_lock_irqsave(&info->irq_spinlock,flags);
2652 if ( !info->rx_enabled )
2653 usc_start_receiver(info);
2655 if ( info->rx_enabled )
2656 usc_stop_receiver(info);
2658 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2661 } /* end of mgsl_rxenable() */
2663 /* mgsl_wait_event() wait for specified event to occur
2665 * Arguments: info pointer to device instance data
2666 * mask pointer to bitmask of events to wait for
2667 * Return Value: 0 if successful and bit mask updated with
2668 * of events triggerred,
2669 * otherwise error code
2671 static int mgsl_wait_event(struct mgsl_struct * info, int __user * mask_ptr)
2673 unsigned long flags;
2676 struct mgsl_icount cprev, cnow;
2679 struct _input_signal_events oldsigs, newsigs;
2680 DECLARE_WAITQUEUE(wait, current);
2682 COPY_FROM_USER(rc,&mask, mask_ptr, sizeof(int));
2687 if (debug_level >= DEBUG_LEVEL_INFO)
2688 printk("%s(%d):mgsl_wait_event(%s,%d)\n", __FILE__,__LINE__,
2689 info->device_name, mask);
2691 spin_lock_irqsave(&info->irq_spinlock,flags);
2693 /* return immediately if state matches requested events */
2694 usc_get_serial_signals(info);
2695 s = info->serial_signals;
2697 ( ((s & SerialSignal_DSR) ? MgslEvent_DsrActive:MgslEvent_DsrInactive) +
2698 ((s & SerialSignal_DCD) ? MgslEvent_DcdActive:MgslEvent_DcdInactive) +
2699 ((s & SerialSignal_CTS) ? MgslEvent_CtsActive:MgslEvent_CtsInactive) +
2700 ((s & SerialSignal_RI) ? MgslEvent_RiActive :MgslEvent_RiInactive) );
2702 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2706 /* save current irq counts */
2707 cprev = info->icount;
2708 oldsigs = info->input_signal_events;
2710 /* enable hunt and idle irqs if needed */
2711 if (mask & (MgslEvent_ExitHuntMode + MgslEvent_IdleReceived)) {
2712 u16 oldreg = usc_InReg(info,RICR);
2713 u16 newreg = oldreg +
2714 (mask & MgslEvent_ExitHuntMode ? RXSTATUS_EXITED_HUNT:0) +
2715 (mask & MgslEvent_IdleReceived ? RXSTATUS_IDLE_RECEIVED:0);
2716 if (oldreg != newreg)
2717 usc_OutReg(info, RICR, newreg);
2720 set_current_state(TASK_INTERRUPTIBLE);
2721 add_wait_queue(&info->event_wait_q, &wait);
2723 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2728 if (signal_pending(current)) {
2733 /* get current irq counts */
2734 spin_lock_irqsave(&info->irq_spinlock,flags);
2735 cnow = info->icount;
2736 newsigs = info->input_signal_events;
2737 set_current_state(TASK_INTERRUPTIBLE);
2738 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2740 /* if no change, wait aborted for some reason */
2741 if (newsigs.dsr_up == oldsigs.dsr_up &&
2742 newsigs.dsr_down == oldsigs.dsr_down &&
2743 newsigs.dcd_up == oldsigs.dcd_up &&
2744 newsigs.dcd_down == oldsigs.dcd_down &&
2745 newsigs.cts_up == oldsigs.cts_up &&
2746 newsigs.cts_down == oldsigs.cts_down &&
2747 newsigs.ri_up == oldsigs.ri_up &&
2748 newsigs.ri_down == oldsigs.ri_down &&
2749 cnow.exithunt == cprev.exithunt &&
2750 cnow.rxidle == cprev.rxidle) {
2756 ( (newsigs.dsr_up != oldsigs.dsr_up ? MgslEvent_DsrActive:0) +
2757 (newsigs.dsr_down != oldsigs.dsr_down ? MgslEvent_DsrInactive:0) +
2758 (newsigs.dcd_up != oldsigs.dcd_up ? MgslEvent_DcdActive:0) +
2759 (newsigs.dcd_down != oldsigs.dcd_down ? MgslEvent_DcdInactive:0) +
2760 (newsigs.cts_up != oldsigs.cts_up ? MgslEvent_CtsActive:0) +
2761 (newsigs.cts_down != oldsigs.cts_down ? MgslEvent_CtsInactive:0) +
2762 (newsigs.ri_up != oldsigs.ri_up ? MgslEvent_RiActive:0) +
2763 (newsigs.ri_down != oldsigs.ri_down ? MgslEvent_RiInactive:0) +
2764 (cnow.exithunt != cprev.exithunt ? MgslEvent_ExitHuntMode:0) +
2765 (cnow.rxidle != cprev.rxidle ? MgslEvent_IdleReceived:0) );
2773 remove_wait_queue(&info->event_wait_q, &wait);
2774 set_current_state(TASK_RUNNING);
2776 if (mask & (MgslEvent_ExitHuntMode + MgslEvent_IdleReceived)) {
2777 spin_lock_irqsave(&info->irq_spinlock,flags);
2778 if (!waitqueue_active(&info->event_wait_q)) {
2779 /* disable enable exit hunt mode/idle rcvd IRQs */
2780 usc_OutReg(info, RICR, usc_InReg(info,RICR) &
2781 ~(RXSTATUS_EXITED_HUNT + RXSTATUS_IDLE_RECEIVED));
2783 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2787 PUT_USER(rc, events, mask_ptr);
2791 } /* end of mgsl_wait_event() */
2793 static int modem_input_wait(struct mgsl_struct *info,int arg)
2795 unsigned long flags;
2797 struct mgsl_icount cprev, cnow;
2798 DECLARE_WAITQUEUE(wait, current);
2800 /* save current irq counts */
2801 spin_lock_irqsave(&info->irq_spinlock,flags);
2802 cprev = info->icount;
2803 add_wait_queue(&info->status_event_wait_q, &wait);
2804 set_current_state(TASK_INTERRUPTIBLE);
2805 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2809 if (signal_pending(current)) {
2814 /* get new irq counts */
2815 spin_lock_irqsave(&info->irq_spinlock,flags);
2816 cnow = info->icount;
2817 set_current_state(TASK_INTERRUPTIBLE);
2818 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2820 /* if no change, wait aborted for some reason */
2821 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
2822 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) {
2827 /* check for change in caller specified modem input */
2828 if ((arg & TIOCM_RNG && cnow.rng != cprev.rng) ||
2829 (arg & TIOCM_DSR && cnow.dsr != cprev.dsr) ||
2830 (arg & TIOCM_CD && cnow.dcd != cprev.dcd) ||
2831 (arg & TIOCM_CTS && cnow.cts != cprev.cts)) {
2838 remove_wait_queue(&info->status_event_wait_q, &wait);
2839 set_current_state(TASK_RUNNING);
2843 /* return the state of the serial control and status signals
2845 static int tiocmget(struct tty_struct *tty, struct file *file)
2847 struct mgsl_struct *info = (struct mgsl_struct *)tty->driver_data;
2848 unsigned int result;
2849 unsigned long flags;
2851 spin_lock_irqsave(&info->irq_spinlock,flags);
2852 usc_get_serial_signals(info);
2853 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2855 result = ((info->serial_signals & SerialSignal_RTS) ? TIOCM_RTS:0) +
2856 ((info->serial_signals & SerialSignal_DTR) ? TIOCM_DTR:0) +
2857 ((info->serial_signals & SerialSignal_DCD) ? TIOCM_CAR:0) +
2858 ((info->serial_signals & SerialSignal_RI) ? TIOCM_RNG:0) +
2859 ((info->serial_signals & SerialSignal_DSR) ? TIOCM_DSR:0) +
2860 ((info->serial_signals & SerialSignal_CTS) ? TIOCM_CTS:0);
2862 if (debug_level >= DEBUG_LEVEL_INFO)
2863 printk("%s(%d):%s tiocmget() value=%08X\n",
2864 __FILE__,__LINE__, info->device_name, result );
2868 /* set modem control signals (DTR/RTS)
2870 static int tiocmset(struct tty_struct *tty, struct file *file,
2871 unsigned int set, unsigned int clear)
2873 struct mgsl_struct *info = (struct mgsl_struct *)tty->driver_data;
2874 unsigned long flags;
2876 if (debug_level >= DEBUG_LEVEL_INFO)
2877 printk("%s(%d):%s tiocmset(%x,%x)\n",
2878 __FILE__,__LINE__,info->device_name, set, clear);
2880 if (set & TIOCM_RTS)
2881 info->serial_signals |= SerialSignal_RTS;
2882 if (set & TIOCM_DTR)
2883 info->serial_signals |= SerialSignal_DTR;
2884 if (clear & TIOCM_RTS)
2885 info->serial_signals &= ~SerialSignal_RTS;
2886 if (clear & TIOCM_DTR)
2887 info->serial_signals &= ~SerialSignal_DTR;
2889 spin_lock_irqsave(&info->irq_spinlock,flags);
2890 usc_set_serial_signals(info);
2891 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2896 /* mgsl_break() Set or clear transmit break condition
2898 * Arguments: tty pointer to tty instance data
2899 * break_state -1=set break condition, 0=clear
2900 * Return Value: None
2902 static void mgsl_break(struct tty_struct *tty, int break_state)
2904 struct mgsl_struct * info = (struct mgsl_struct *)tty->driver_data;
2905 unsigned long flags;
2907 if (debug_level >= DEBUG_LEVEL_INFO)
2908 printk("%s(%d):mgsl_break(%s,%d)\n",
2909 __FILE__,__LINE__, info->device_name, break_state);
2911 if (mgsl_paranoia_check(info, tty->name, "mgsl_break"))
2914 spin_lock_irqsave(&info->irq_spinlock,flags);
2915 if (break_state == -1)
2916 usc_OutReg(info,IOCR,(u16)(usc_InReg(info,IOCR) | BIT7));
2918 usc_OutReg(info,IOCR,(u16)(usc_InReg(info,IOCR) & ~BIT7));
2919 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2921 } /* end of mgsl_break() */
2923 /* mgsl_ioctl() Service an IOCTL request
2927 * tty pointer to tty instance data
2928 * file pointer to associated file object for device
2929 * cmd IOCTL command code
2930 * arg command argument/context
2932 * Return Value: 0 if success, otherwise error code
2934 static int mgsl_ioctl(struct tty_struct *tty, struct file * file,
2935 unsigned int cmd, unsigned long arg)
2937 struct mgsl_struct * info = (struct mgsl_struct *)tty->driver_data;
2940 if (debug_level >= DEBUG_LEVEL_INFO)
2941 printk("%s(%d):mgsl_ioctl %s cmd=%08X\n", __FILE__,__LINE__,
2942 info->device_name, cmd );
2944 if (mgsl_paranoia_check(info, tty->name, "mgsl_ioctl"))
2947 if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
2948 (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
2949 if (tty->flags & (1 << TTY_IO_ERROR))
2954 ret = mgsl_ioctl_common(info, cmd, arg);
2959 static int mgsl_ioctl_common(struct mgsl_struct *info, unsigned int cmd, unsigned long arg)
2962 struct mgsl_icount cnow; /* kernel counter temps */
2963 void __user *argp = (void __user *)arg;
2964 struct serial_icounter_struct __user *p_cuser; /* user space */
2965 unsigned long flags;
2968 case MGSL_IOCGPARAMS:
2969 return mgsl_get_params(info, argp);
2970 case MGSL_IOCSPARAMS:
2971 return mgsl_set_params(info, argp);
2972 case MGSL_IOCGTXIDLE:
2973 return mgsl_get_txidle(info, argp);
2974 case MGSL_IOCSTXIDLE:
2975 return mgsl_set_txidle(info,(int)arg);
2976 case MGSL_IOCTXENABLE:
2977 return mgsl_txenable(info,(int)arg);
2978 case MGSL_IOCRXENABLE:
2979 return mgsl_rxenable(info,(int)arg);
2980 case MGSL_IOCTXABORT:
2981 return mgsl_txabort(info);
2982 case MGSL_IOCGSTATS:
2983 return mgsl_get_stats(info, argp);
2984 case MGSL_IOCWAITEVENT:
2985 return mgsl_wait_event(info, argp);
2986 case MGSL_IOCLOOPTXDONE:
2987 return mgsl_loopmode_send_done(info);
2988 /* Wait for modem input (DCD,RI,DSR,CTS) change
2989 * as specified by mask in arg (TIOCM_RNG/DSR/CD/CTS)
2992 return modem_input_wait(info,(int)arg);
2995 * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
2996 * Return: write counters to the user passed counter struct
2997 * NB: both 1->0 and 0->1 transitions are counted except for
2998 * RI where only 0->1 is counted.
3001 spin_lock_irqsave(&info->irq_spinlock,flags);
3002 cnow = info->icount;
3003 spin_unlock_irqrestore(&info->irq_spinlock,flags);
3005 PUT_USER(error,cnow.cts, &p_cuser->cts);
3006 if (error) return error;
3007 PUT_USER(error,cnow.dsr, &p_cuser->dsr);
3008 if (error) return error;
3009 PUT_USER(error,cnow.rng, &p_cuser->rng);
3010 if (error) return error;
3011 PUT_USER(error,cnow.dcd, &p_cuser->dcd);
3012 if (error) return error;
3013 PUT_USER(error,cnow.rx, &p_cuser->rx);
3014 if (error) return error;
3015 PUT_USER(error,cnow.tx, &p_cuser->tx);
3016 if (error) return error;
3017 PUT_USER(error,cnow.frame, &p_cuser->frame);
3018 if (error) return error;
3019 PUT_USER(error,cnow.overrun, &p_cuser->overrun);
3020 if (error) return error;
3021 PUT_USER(error,cnow.parity, &p_cuser->parity);
3022 if (error) return error;
3023 PUT_USER(error,cnow.brk, &p_cuser->brk);
3024 if (error) return error;
3025 PUT_USER(error,cnow.buf_overrun, &p_cuser->buf_overrun);
3026 if (error) return error;
3029 return -ENOIOCTLCMD;
3034 /* mgsl_set_termios()
3036 * Set new termios settings
3040 * tty pointer to tty structure
3041 * termios pointer to buffer to hold returned old termios
3043 * Return Value: None
3045 static void mgsl_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
3047 struct mgsl_struct *info = (struct mgsl_struct *)tty->driver_data;
3048 unsigned long flags;
3050 if (debug_level >= DEBUG_LEVEL_INFO)
3051 printk("%s(%d):mgsl_set_termios %s\n", __FILE__,__LINE__,
3052 tty->driver->name );
3054 mgsl_change_params(info);
3056 /* Handle transition to B0 status */
3057 if (old_termios->c_cflag & CBAUD &&
3058 !(tty->termios->c_cflag & CBAUD)) {
3059 info->serial_signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
3060 spin_lock_irqsave(&info->irq_spinlock,flags);
3061 usc_set_serial_signals(info);
3062 spin_unlock_irqrestore(&info->irq_spinlock,flags);
3065 /* Handle transition away from B0 status */
3066 if (!(old_termios->c_cflag & CBAUD) &&
3067 tty->termios->c_cflag & CBAUD) {
3068 info->serial_signals |= SerialSignal_DTR;
3069 if (!(tty->termios->c_cflag & CRTSCTS) ||
3070 !test_bit(TTY_THROTTLED, &tty->flags)) {
3071 info->serial_signals |= SerialSignal_RTS;
3073 spin_lock_irqsave(&info->irq_spinlock,flags);
3074 usc_set_serial_signals(info);
3075 spin_unlock_irqrestore(&info->irq_spinlock,flags);
3078 /* Handle turning off CRTSCTS */
3079 if (old_termios->c_cflag & CRTSCTS &&
3080 !(tty->termios->c_cflag & CRTSCTS)) {
3081 tty->hw_stopped = 0;
3085 } /* end of mgsl_set_termios() */
3089 * Called when port is closed. Wait for remaining data to be
3090 * sent. Disable port and free resources.
3094 * tty pointer to open tty structure
3095 * filp pointer to open file object
3097 * Return Value: None
3099 static void mgsl_close(struct tty_struct *tty, struct file * filp)
3101 struct mgsl_struct * info = (struct mgsl_struct *)tty->driver_data;
3103 if (mgsl_paranoia_check(info, tty->name, "mgsl_close"))
3106 if (debug_level >= DEBUG_LEVEL_INFO)
3107 printk("%s(%d):mgsl_close(%s) entry, count=%d\n",
3108 __FILE__,__LINE__, info->device_name, info->port.count);
3110 if (!info->port.count)
3113 if (tty_hung_up_p(filp))
3116 if ((tty->count == 1) && (info->port.count != 1)) {
3118 * tty->count is 1 and the tty structure will be freed.
3119 * info->port.count should be one in this case.
3120 * if it's not, correct it so that the port is shutdown.
3122 printk("mgsl_close: bad refcount; tty->count is 1, "
3123 "info->port.count is %d\n", info->port.count);
3124 info->port.count = 1;
3129 /* if at least one open remaining, leave hardware active */
3130 if (info->port.count)
3133 info->port.flags |= ASYNC_CLOSING;
3135 /* set tty->closing to notify line discipline to
3136 * only process XON/XOFF characters. Only the N_TTY
3137 * discipline appears to use this (ppp does not).
3141 /* wait for transmit data to clear all layers */
3143 if (info->port.closing_wait != ASYNC_CLOSING_WAIT_NONE) {
3144 if (debug_level >= DEBUG_LEVEL_INFO)
3145 printk("%s(%d):mgsl_close(%s) calling tty_wait_until_sent\n",
3146 __FILE__,__LINE__, info->device_name );
3147 tty_wait_until_sent(tty, info->port.closing_wait);
3150 if (info->port.flags & ASYNC_INITIALIZED)
3151 mgsl_wait_until_sent(tty, info->timeout);
3153 mgsl_flush_buffer(tty);
3155 tty_ldisc_flush(tty);
3160 info->port.tty = NULL;
3162 if (info->port.blocked_open) {
3163 if (info->port.close_delay) {
3164 msleep_interruptible(jiffies_to_msecs(info->port.close_delay));
3166 wake_up_interruptible(&info->port.open_wait);
3169 info->port.flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
3171 wake_up_interruptible(&info->port.close_wait);
3174 if (debug_level >= DEBUG_LEVEL_INFO)
3175 printk("%s(%d):mgsl_close(%s) exit, count=%d\n", __FILE__,__LINE__,
3176 tty->driver->name, info->port.count);
3178 } /* end of mgsl_close() */
3180 /* mgsl_wait_until_sent()
3182 * Wait until the transmitter is empty.
3186 * tty pointer to tty info structure
3187 * timeout time to wait for send completion
3189 * Return Value: None
3191 static void mgsl_wait_until_sent(struct tty_struct *tty, int timeout)
3193 struct mgsl_struct * info = (struct mgsl_struct *)tty->driver_data;
3194 unsigned long orig_jiffies, char_time;
3199 if (debug_level >= DEBUG_LEVEL_INFO)
3200 printk("%s(%d):mgsl_wait_until_sent(%s) entry\n",
3201 __FILE__,__LINE__, info->device_name );
3203 if (mgsl_paranoia_check(info, tty->name, "mgsl_wait_until_sent"))
3206 if (!(info->port.flags & ASYNC_INITIALIZED))
3209 orig_jiffies = jiffies;
3211 /* Set check interval to 1/5 of estimated time to
3212 * send a character, and make it at least 1. The check
3213 * interval should also be less than the timeout.
3214 * Note: use tight timings here to satisfy the NIST-PCTS.
3218 if ( info->params.data_rate ) {
3219 char_time = info->timeout/(32 * 5);
3226 char_time = min_t(unsigned long, char_time, timeout);
3228 if ( info->params.mode == MGSL_MODE_HDLC ||
3229 info->params.mode == MGSL_MODE_RAW ) {
3230 while (info->tx_active) {
3231 msleep_interruptible(jiffies_to_msecs(char_time));
3232 if (signal_pending(current))
3234 if (timeout && time_after(jiffies, orig_jiffies + timeout))
3238 while (!(usc_InReg(info,TCSR) & TXSTATUS_ALL_SENT) &&
3240 msleep_interruptible(jiffies_to_msecs(char_time));
3241 if (signal_pending(current))
3243 if (timeout && time_after(jiffies, orig_jiffies + timeout))
3250 if (debug_level >= DEBUG_LEVEL_INFO)
3251 printk("%s(%d):mgsl_wait_until_sent(%s) exit\n",
3252 __FILE__,__LINE__, info->device_name );
3254 } /* end of mgsl_wait_until_sent() */
3258 * Called by tty_hangup() when a hangup is signaled.
3259 * This is the same as to closing all open files for the port.
3261 * Arguments: tty pointer to associated tty object
3262 * Return Value: None
3264 static void mgsl_hangup(struct tty_struct *tty)
3266 struct mgsl_struct * info = (struct mgsl_struct *)tty->driver_data;
3268 if (debug_level >= DEBUG_LEVEL_INFO)
3269 printk("%s(%d):mgsl_hangup(%s)\n",
3270 __FILE__,__LINE__, info->device_name );
3272 if (mgsl_paranoia_check(info, tty->name, "mgsl_hangup"))
3275 mgsl_flush_buffer(tty);
3278 info->port.count = 0;
3279 info->port.flags &= ~ASYNC_NORMAL_ACTIVE;
3280 info->port.tty = NULL;
3282 wake_up_interruptible(&info->port.open_wait);
3284 } /* end of mgsl_hangup() */
3286 /* block_til_ready()
3288 * Block the current process until the specified port
3289 * is ready to be opened.
3293 * tty pointer to tty info structure
3294 * filp pointer to open file object
3295 * info pointer to device instance data
3297 * Return Value: 0 if success, otherwise error code
3299 static int block_til_ready(struct tty_struct *tty, struct file * filp,
3300 struct mgsl_struct *info)
3302 DECLARE_WAITQUEUE(wait, current);
3304 bool do_clocal = false;
3305 bool extra_count = false;
3306 unsigned long flags;
3308 if (debug_level >= DEBUG_LEVEL_INFO)
3309 printk("%s(%d):block_til_ready on %s\n",
3310 __FILE__,__LINE__, tty->driver->name );
3312 if (filp->f_flags & O_NONBLOCK || tty->flags & (1 << TTY_IO_ERROR)){
3313 /* nonblock mode is set or port is not enabled */
3314 info->port.flags |= ASYNC_NORMAL_ACTIVE;
3318 if (tty->termios->c_cflag & CLOCAL)
3321 /* Wait for carrier detect and the line to become
3322 * free (i.e., not in use by the callout). While we are in
3323 * this loop, info->port.count is dropped by one, so that
3324 * mgsl_close() knows when to free things. We restore it upon
3325 * exit, either normal or abnormal.
3329 add_wait_queue(&info->port.open_wait, &wait);
3331 if (debug_level >= DEBUG_LEVEL_INFO)
3332 printk("%s(%d):block_til_ready before block on %s count=%d\n",
3333 __FILE__,__LINE__, tty->driver->name, info->port.count );
3335 spin_lock_irqsave(&info->irq_spinlock, flags);
3336 if (!tty_hung_up_p(filp)) {
3340 spin_unlock_irqrestore(&info->irq_spinlock, flags);
3341 info->port.blocked_open++;
3344 if (tty->termios->c_cflag & CBAUD) {
3345 spin_lock_irqsave(&info->irq_spinlock,flags);
3346 info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
3347 usc_set_serial_signals(info);
3348 spin_unlock_irqrestore(&info->irq_spinlock,flags);
3351 set_current_state(TASK_INTERRUPTIBLE);
3353 if (tty_hung_up_p(filp) || !(info->port.flags & ASYNC_INITIALIZED)){
3354 retval = (info->port.flags & ASYNC_HUP_NOTIFY) ?
3355 -EAGAIN : -ERESTARTSYS;
3359 spin_lock_irqsave(&info->irq_spinlock,flags);
3360 usc_get_serial_signals(info);
3361 spin_unlock_irqrestore(&info->irq_spinlock,flags);
3363 if (!(info->port.flags & ASYNC_CLOSING) &&
3364 (do_clocal || (info->serial_signals & SerialSignal_DCD)) ) {
3368 if (signal_pending(current)) {
3369 retval = -ERESTARTSYS;
3373 if (debug_level >= DEBUG_LEVEL_INFO)
3374 printk("%s(%d):block_til_ready blocking on %s count=%d\n",
3375 __FILE__,__LINE__, tty->driver->name, info->port.count );
3380 set_current_state(TASK_RUNNING);
3381 remove_wait_queue(&info->port.open_wait, &wait);
3385 info->port.blocked_open--;
3387 if (debug_level >= DEBUG_LEVEL_INFO)
3388 printk("%s(%d):block_til_ready after blocking on %s count=%d\n",
3389 __FILE__,__LINE__, tty->driver->name, info->port.count );
3392 info->port.flags |= ASYNC_NORMAL_ACTIVE;
3396 } /* end of block_til_ready() */
3400 * Called when a port is opened. Init and enable port.
3401 * Perform serial-specific initialization for the tty structure.
3403 * Arguments: tty pointer to tty info structure
3404 * filp associated file pointer
3406 * Return Value: 0 if success, otherwise error code
3408 static int mgsl_open(struct tty_struct *tty, struct file * filp)
3410 struct mgsl_struct *info;
3412 unsigned long flags;
3414 /* verify range of specified line number */
3416 if ((line < 0) || (line >= mgsl_device_count)) {
3417 printk("%s(%d):mgsl_open with invalid line #%d.\n",
3418 __FILE__,__LINE__,line);
3422 /* find the info structure for the specified line */
3423 info = mgsl_device_list;
3424 while(info && info->line != line)
3425 info = info->next_device;
3426 if (mgsl_paranoia_check(info, tty->name, "mgsl_open"))
3429 tty->driver_data = info;
3430 info->port.tty = tty;
3432 if (debug_level >= DEBUG_LEVEL_INFO)
3433 printk("%s(%d):mgsl_open(%s), old ref count = %d\n",
3434 __FILE__,__LINE__,tty->driver->name, info->port.count);
3436 /* If port is closing, signal caller to try again */
3437 if (tty_hung_up_p(filp) || info->port.flags & ASYNC_CLOSING){
3438 if (info->port.flags & ASYNC_CLOSING)
3439 interruptible_sleep_on(&info->port.close_wait);
3440 retval = ((info->port.flags & ASYNC_HUP_NOTIFY) ?
3441 -EAGAIN : -ERESTARTSYS);
3445 info->port.tty->low_latency = (info->port.flags & ASYNC_LOW_LATENCY) ? 1 : 0;
3447 spin_lock_irqsave(&info->netlock, flags);
3448 if (info->netcount) {
3450 spin_unlock_irqrestore(&info->netlock, flags);
3454 spin_unlock_irqrestore(&info->netlock, flags);
3456 if (info->port.count == 1) {
3457 /* 1st open on this device, init hardware */
3458 retval = startup(info);
3463 retval = block_til_ready(tty, filp, info);
3465 if (debug_level >= DEBUG_LEVEL_INFO)
3466 printk("%s(%d):block_til_ready(%s) returned %d\n",
3467 __FILE__,__LINE__, info->device_name, retval);
3471 if (debug_level >= DEBUG_LEVEL_INFO)
3472 printk("%s(%d):mgsl_open(%s) success\n",
3473 __FILE__,__LINE__, info->device_name);
3478 if (tty->count == 1)
3479 info->port.tty = NULL; /* tty layer will release tty struct */
3480 if(info->port.count)
3486 } /* end of mgsl_open() */
3489 * /proc fs routines....
3492 static inline int line_info(char *buf, struct mgsl_struct *info)
3496 unsigned long flags;
3498 if (info->bus_type == MGSL_BUS_TYPE_PCI) {
3499 ret = sprintf(buf, "%s:PCI io:%04X irq:%d mem:%08X lcr:%08X",
3500 info->device_name, info->io_base, info->irq_level,
3501 info->phys_memory_base, info->phys_lcr_base);
3503 ret = sprintf(buf, "%s:(E)ISA io:%04X irq:%d dma:%d",
3504 info->device_name, info->io_base,
3505 info->irq_level, info->dma_level);
3508 /* output current serial signal states */
3509 spin_lock_irqsave(&info->irq_spinlock,flags);
3510 usc_get_serial_signals(info);
3511 spin_unlock_irqrestore(&info->irq_spinlock,flags);
3515 if (info->serial_signals & SerialSignal_RTS)
3516 strcat(stat_buf, "|RTS");
3517 if (info->serial_signals & SerialSignal_CTS)
3518 strcat(stat_buf, "|CTS");
3519 if (info->serial_signals & SerialSignal_DTR)
3520 strcat(stat_buf, "|DTR");
3521 if (info->serial_signals & SerialSignal_DSR)
3522 strcat(stat_buf, "|DSR");
3523 if (info->serial_signals & SerialSignal_DCD)
3524 strcat(stat_buf, "|CD");
3525 if (info->serial_signals & SerialSignal_RI)
3526 strcat(stat_buf, "|RI");
3528 if (info->params.mode == MGSL_MODE_HDLC ||
3529 info->params.mode == MGSL_MODE_RAW ) {
3530 ret += sprintf(buf+ret, " HDLC txok:%d rxok:%d",
3531 info->icount.txok, info->icount.rxok);
3532 if (info->icount.txunder)
3533 ret += sprintf(buf+ret, " txunder:%d", info->icount.txunder);
3534 if (info->icount.txabort)
3535 ret += sprintf(buf+ret, " txabort:%d", info->icount.txabort);
3536 if (info->icount.rxshort)
3537 ret += sprintf(buf+ret, " rxshort:%d", info->icount.rxshort);
3538 if (info->icount.rxlong)
3539 ret += sprintf(buf+ret, " rxlong:%d", info->icount.rxlong);
3540 if (info->icount.rxover)
3541 ret += sprintf(buf+ret, " rxover:%d", info->icount.rxover);
3542 if (info->icount.rxcrc)
3543 ret += sprintf(buf+ret, " rxcrc:%d", info->icount.rxcrc);
3545 ret += sprintf(buf+ret, " ASYNC tx:%d rx:%d",
3546 info->icount.tx, info->icount.rx);
3547 if (info->icount.frame)
3548 ret += sprintf(buf+ret, " fe:%d", info->icount.frame);
3549 if (info->icount.parity)
3550 ret += sprintf(buf+ret, " pe:%d", info->icount.parity);
3551 if (info->icount.brk)
3552 ret += sprintf(buf+ret, " brk:%d", info->icount.brk);
3553 if (info->icount.overrun)
3554 ret += sprintf(buf+ret, " oe:%d", info->icount.overrun);
3557 /* Append serial signal status to end */
3558 ret += sprintf(buf+ret, " %s\n", stat_buf+1);
3560 ret += sprintf(buf+ret, "txactive=%d bh_req=%d bh_run=%d pending_bh=%x\n",
3561 info->tx_active,info->bh_requested,info->bh_running,
3564 spin_lock_irqsave(&info->irq_spinlock,flags);
3566 u16 Tcsr = usc_InReg( info, TCSR );
3567 u16 Tdmr = usc_InDmaReg( info, TDMR );
3568 u16 Ticr = usc_InReg( info, TICR );
3569 u16 Rscr = usc_InReg( info, RCSR );
3570 u16 Rdmr = usc_InDmaReg( info, RDMR );
3571 u16 Ricr = usc_InReg( info, RICR );
3572 u16 Icr = usc_InReg( info, ICR );
3573 u16 Dccr = usc_InReg( info, DCCR );
3574 u16 Tmr = usc_InReg( info, TMR );
3575 u16 Tccr = usc_InReg( info, TCCR );
3576 u16 Ccar = inw( info->io_base + CCAR );
3577 ret += sprintf(buf+ret, "tcsr=%04X tdmr=%04X ticr=%04X rcsr=%04X rdmr=%04X\n"
3578 "ricr=%04X icr =%04X dccr=%04X tmr=%04X tccr=%04X ccar=%04X\n",
3579 Tcsr,Tdmr,Ticr,Rscr,Rdmr,Ricr,Icr,Dccr,Tmr,Tccr,Ccar );
3581 spin_unlock_irqrestore(&info->irq_spinlock,flags);
3585 } /* end of line_info() */
3589 * Called to print information about devices
3592 * page page of memory to hold returned info
3601 static int mgsl_read_proc(char *page, char **start, off_t off, int count,
3602 int *eof, void *data)
3606 struct mgsl_struct *info;
3608 len += sprintf(page, "synclink driver:%s\n", driver_version);
3610 info = mgsl_device_list;
3612 l = line_info(page + len, info);
3614 if (len+begin > off+count)
3616 if (len+begin < off) {
3620 info = info->next_device;
3625 if (off >= len+begin)
3627 *start = page + (off-begin);
3628 return ((count < begin+len-off) ? count : begin+len-off);
3630 } /* end of mgsl_read_proc() */
3632 /* mgsl_allocate_dma_buffers()
3634 * Allocate and format DMA buffers (ISA adapter)
3635 * or format shared memory buffers (PCI adapter).
3637 * Arguments: info pointer to device instance data
3638 * Return Value: 0 if success, otherwise error
3640 static int mgsl_allocate_dma_buffers(struct mgsl_struct *info)
3642 unsigned short BuffersPerFrame;
3644 info->last_mem_alloc = 0;
3646 /* Calculate the number of DMA buffers necessary to hold the */
3647 /* largest allowable frame size. Note: If the max frame size is */
3648 /* not an even multiple of the DMA buffer size then we need to */
3649 /* round the buffer count per frame up one. */
3651 BuffersPerFrame = (unsigned short)(info->max_frame_size/DMABUFFERSIZE);
3652 if ( info->max_frame_size % DMABUFFERSIZE )
3655 if ( info->bus_type == MGSL_BUS_TYPE_PCI ) {
3657 * The PCI adapter has 256KBytes of shared memory to use.
3658 * This is 64 PAGE_SIZE buffers.
3660 * The first page is used for padding at this time so the
3661 * buffer list does not begin at offset 0 of the PCI
3662 * adapter's shared memory.
3664 * The 2nd page is used for the buffer list. A 4K buffer
3665 * list can hold 128 DMA_BUFFER structures at 32 bytes
3668 * This leaves 62 4K pages.
3670 * The next N pages are used for transmit frame(s). We
3671 * reserve enough 4K page blocks to hold the required
3672 * number of transmit dma buffers (num_tx_dma_buffers),
3673 * each of MaxFrameSize size.
3675 * Of the remaining pages (62-N), determine how many can
3676 * be used to receive full MaxFrameSize inbound frames
3678 info->tx_buffer_count = info->num_tx_dma_buffers * BuffersPerFrame;
3679 info->rx_buffer_count = 62 - info->tx_buffer_count;
3681 /* Calculate the number of PAGE_SIZE buffers needed for */
3682 /* receive and transmit DMA buffers. */
3685 /* Calculate the number of DMA buffers necessary to */
3686 /* hold 7 max size receive frames and one max size transmit frame. */
3687 /* The receive buffer count is bumped by one so we avoid an */
3688 /* End of List condition if all receive buffers are used when */
3689 /* using linked list DMA buffers. */
3691 info->tx_buffer_count = info->num_tx_dma_buffers * BuffersPerFrame;
3692 info->rx_buffer_count = (BuffersPerFrame * MAXRXFRAMES) + 6;
3695 * limit total TxBuffers & RxBuffers to 62 4K total
3696 * (ala PCI Allocation)
3699 if ( (info->tx_buffer_count + info->rx_buffer_count) > 62 )
3700 info->rx_buffer_count = 62 - info->tx_buffer_count;
3704 if ( debug_level >= DEBUG_LEVEL_INFO )
3705 printk("%s(%d):Allocating %d TX and %d RX DMA buffers.\n",
3706 __FILE__,__LINE__, info->tx_buffer_count,info->rx_buffer_count);
3708 if ( mgsl_alloc_buffer_list_memory( info ) < 0 ||
3709 mgsl_alloc_frame_memory(info, info->rx_buffer_list, info->rx_buffer_count) < 0 ||
3710 mgsl_alloc_frame_memory(info, info->tx_buffer_list, info->tx_buffer_count) < 0 ||
3711 mgsl_alloc_intermediate_rxbuffer_memory(info) < 0 ||
3712 mgsl_alloc_intermediate_txbuffer_memory(info) < 0 ) {
3713 printk("%s(%d):Can't allocate DMA buffer memory\n",__FILE__,__LINE__);
3717 mgsl_reset_rx_dma_buffers( info );
3718 mgsl_reset_tx_dma_buffers( info );
3722 } /* end of mgsl_allocate_dma_buffers() */
3725 * mgsl_alloc_buffer_list_memory()
3727 * Allocate a common DMA buffer for use as the
3728 * receive and transmit buffer lists.
3730 * A buffer list is a set of buffer entries where each entry contains
3731 * a pointer to an actual buffer and a pointer to the next buffer entry
3732 * (plus some other info about the buffer).
3734 * The buffer entries for a list are built to form a circular list so
3735 * that when the entire list has been traversed you start back at the
3738 * This function allocates memory for just the buffer entries.
3739 * The links (pointer to next entry) are filled in with the physical
3740 * address of the next entry so the adapter can navigate the list
3741 * using bus master DMA. The pointers to the actual buffers are filled
3742 * out later when the actual buffers are allocated.
3744 * Arguments: info pointer to device instance data
3745 * Return Value: 0 if success, otherwise error
3747 static int mgsl_alloc_buffer_list_memory( struct mgsl_struct *info )
3751 if ( info->bus_type == MGSL_BUS_TYPE_PCI ) {
3752 /* PCI adapter uses shared memory. */
3753 info->buffer_list = info->memory_base + info->last_mem_alloc;
3754 info->buffer_list_phys = info->last_mem_alloc;
3755 info->last_mem_alloc += BUFFERLISTSIZE;
3757 /* ISA adapter uses system memory. */
3758 /* The buffer lists are allocated as a common buffer that both */
3759 /* the processor and adapter can access. This allows the driver to */
3760 /* inspect portions of the buffer while other portions are being */
3761 /* updated by the adapter using Bus Master DMA. */
3763 info->buffer_list = dma_alloc_coherent(NULL, BUFFERLISTSIZE, &info->buffer_list_dma_addr, GFP_KERNEL);
3764 if (info->buffer_list == NULL)
3766 info->buffer_list_phys = (u32)(info->buffer_list_dma_addr);
3769 /* We got the memory for the buffer entry lists. */
3770 /* Initialize the memory block to all zeros. */
3771 memset( info->buffer_list, 0, BUFFERLISTSIZE );
3773 /* Save virtual address pointers to the receive and */
3774 /* transmit buffer lists. (Receive 1st). These pointers will */
3775 /* be used by the processor to access the lists. */
3776 info->rx_buffer_list = (DMABUFFERENTRY *)info->buffer_list;
3777 info->tx_buffer_list = (DMABUFFERENTRY *)info->buffer_list;
3778 info->tx_buffer_list += info->rx_buffer_count;
3781 * Build the links for the buffer entry lists such that
3782 * two circular lists are built. (Transmit and Receive).
3784 * Note: the links are physical addresses
3785 * which are read by the adapter to determine the next
3786 * buffer entry to use.
3789 for ( i = 0; i < info->rx_buffer_count; i++ ) {
3790 /* calculate and store physical address of this buffer entry */
3791 info->rx_buffer_list[i].phys_entry =
3792 info->buffer_list_phys + (i * sizeof(DMABUFFERENTRY));
3794 /* calculate and store physical address of */
3795 /* next entry in cirular list of entries */
3797 info->rx_buffer_list[i].link = info->buffer_list_phys;
3799 if ( i < info->rx_buffer_count - 1 )
3800 info->rx_buffer_list[i].link += (i + 1) * sizeof(DMABUFFERENTRY);
3803 for ( i = 0; i < info->tx_buffer_count; i++ ) {
3804 /* calculate and store physical address of this buffer entry */
3805 info->tx_buffer_list[i].phys_entry = info->buffer_list_phys +
3806 ((info->rx_buffer_count + i) * sizeof(DMABUFFERENTRY));
3808 /* calculate and store physical address of */
3809 /* next entry in cirular list of entries */
3811 info->tx_buffer_list[i].link = info->buffer_list_phys +
3812 info->rx_buffer_count * sizeof(DMABUFFERENTRY);
3814 if ( i < info->tx_buffer_count - 1 )
3815 info->tx_buffer_list[i].link += (i + 1) * sizeof(DMABUFFERENTRY);
3820 } /* end of mgsl_alloc_buffer_list_memory() */
3822 /* Free DMA buffers allocated for use as the
3823 * receive and transmit buffer lists.
3826 * The data transfer buffers associated with the buffer list
3827 * MUST be freed before freeing the buffer list itself because
3828 * the buffer list contains the information necessary to free
3829 * the individual buffers!
3831 static void mgsl_free_buffer_list_memory( struct mgsl_struct *info )
3833 if (info->buffer_list && info->bus_type != MGSL_BUS_TYPE_PCI)
3834 dma_free_coherent(NULL, BUFFERLISTSIZE, info->buffer_list, info->buffer_list_dma_addr);
3836 info->buffer_list = NULL;
3837 info->rx_buffer_list = NULL;
3838 info->tx_buffer_list = NULL;
3840 } /* end of mgsl_free_buffer_list_memory() */
3843 * mgsl_alloc_frame_memory()
3845 * Allocate the frame DMA buffers used by the specified buffer list.
3846 * Each DMA buffer will be one memory page in size. This is necessary
3847 * because memory can fragment enough that it may be impossible
3852 * info pointer to device instance data
3853 * BufferList pointer to list of buffer entries
3854 * Buffercount count of buffer entries in buffer list
3856 * Return Value: 0 if success, otherwise -ENOMEM
3858 static int mgsl_alloc_frame_memory(struct mgsl_struct *info,DMABUFFERENTRY *BufferList,int Buffercount)
3863 /* Allocate page sized buffers for the receive buffer list */
3865 for ( i = 0; i < Buffercount; i++ ) {
3866 if ( info->bus_type == MGSL_BUS_TYPE_PCI ) {
3867 /* PCI adapter uses shared memory buffers. */
3868 BufferList[i].virt_addr = info->memory_base + info->last_mem_alloc;
3869 phys_addr = info->last_mem_alloc;
3870 info->last_mem_alloc += DMABUFFERSIZE;
3872 /* ISA adapter uses system memory. */
3873 BufferList[i].virt_addr = dma_alloc_coherent(NULL, DMABUFFERSIZE, &BufferList[i].dma_addr, GFP_KERNEL);
3874 if (BufferList[i].virt_addr == NULL)
3876 phys_addr = (u32)(BufferList[i].dma_addr);
3878 BufferList[i].phys_addr = phys_addr;
3883 } /* end of mgsl_alloc_frame_memory() */
3886 * mgsl_free_frame_memory()
3888 * Free the buffers associated with
3889 * each buffer entry of a buffer list.
3893 * info pointer to device instance data
3894 * BufferList pointer to list of buffer entries
3895 * Buffercount count of buffer entries in buffer list
3897 * Return Value: None
3899 static void mgsl_free_frame_memory(struct mgsl_struct *info, DMABUFFERENTRY *BufferList, int Buffercount)
3904 for ( i = 0 ; i < Buffercount ; i++ ) {
3905 if ( BufferList[i].virt_addr ) {
3906 if ( info->bus_type != MGSL_BUS_TYPE_PCI )
3907 dma_free_coherent(NULL, DMABUFFERSIZE, BufferList[i].virt_addr, BufferList[i].dma_addr);
3908 BufferList[i].virt_addr = NULL;
3913 } /* end of mgsl_free_frame_memory() */
3915 /* mgsl_free_dma_buffers()
3919 * Arguments: info pointer to device instance data
3920 * Return Value: None
3922 static void mgsl_free_dma_buffers( struct mgsl_struct *info )
3924 mgsl_free_frame_memory( info, info->rx_buffer_list, info->rx_buffer_count );
3925 mgsl_free_frame_memory( info, info->tx_buffer_list, info->tx_buffer_count );
3926 mgsl_free_buffer_list_memory( info );
3928 } /* end of mgsl_free_dma_buffers() */
3932 * mgsl_alloc_intermediate_rxbuffer_memory()
3934 * Allocate a buffer large enough to hold max_frame_size. This buffer
3935 * is used to pass an assembled frame to the line discipline.
3939 * info pointer to device instance data
3941 * Return Value: 0 if success, otherwise -ENOMEM
3943 static int mgsl_alloc_intermediate_rxbuffer_memory(struct mgsl_struct *info)
3945 info->intermediate_rxbuffer = kmalloc(info->max_frame_size, GFP_KERNEL | GFP_DMA);
3946 if ( info->intermediate_rxbuffer == NULL )
3951 } /* end of mgsl_alloc_intermediate_rxbuffer_memory() */
3954 * mgsl_free_intermediate_rxbuffer_memory()
3959 * info pointer to device instance data
3961 * Return Value: None
3963 static void mgsl_free_intermediate_rxbuffer_memory(struct mgsl_struct *info)
3965 kfree(info->intermediate_rxbuffer);
3966 info->intermediate_rxbuffer = NULL;
3968 } /* end of mgsl_free_intermediate_rxbuffer_memory() */
3971 * mgsl_alloc_intermediate_txbuffer_memory()
3973 * Allocate intermdiate transmit buffer(s) large enough to hold max_frame_size.
3974 * This buffer is used to load transmit frames into the adapter's dma transfer
3975 * buffers when there is sufficient space.
3979 * info pointer to device instance data
3981 * Return Value: 0 if success, otherwise -ENOMEM
3983 static int mgsl_alloc_intermediate_txbuffer_memory(struct mgsl_struct *info)
3987 if ( debug_level >= DEBUG_LEVEL_INFO )
3988 printk("%s %s(%d) allocating %d tx holding buffers\n",
3989 info->device_name, __FILE__,__LINE__,info->num_tx_holding_buffers);
3991 memset(info->tx_holding_buffers,0,sizeof(info->tx_holding_buffers));
3993 for ( i=0; i<info->num_tx_holding_buffers; ++i) {
3994 info->tx_holding_buffers[i].buffer =
3995 kmalloc(info->max_frame_size, GFP_KERNEL);
3996 if (info->tx_holding_buffers[i].buffer == NULL) {
3997 for (--i; i >= 0; i--) {
3998 kfree(info->tx_holding_buffers[i].buffer);
3999 info->tx_holding_buffers[i].buffer = NULL;
4007 } /* end of mgsl_alloc_intermediate_txbuffer_memory() */
4010 * mgsl_free_intermediate_txbuffer_memory()
4015 * info pointer to device instance data
4017 * Return Value: None
4019 static void mgsl_free_intermediate_txbuffer_memory(struct mgsl_struct *info)
4023 for ( i=0; i<info->num_tx_holding_buffers; ++i ) {
4024 kfree(info->tx_holding_buffers[i].buffer);
4025 info->tx_holding_buffers[i].buffer = NULL;
4028 info->get_tx_holding_index = 0;
4029 info->put_tx_holding_index = 0;
4030 info->tx_holding_count = 0;
4032 } /* end of mgsl_free_intermediate_txbuffer_memory() */
4036 * load_next_tx_holding_buffer()
4038 * attempts to load the next buffered tx request into the
4043 * info pointer to device instance data
4045 * Return Value: true if next buffered tx request loaded
4046 * into adapter's tx dma buffer,
4049 static bool load_next_tx_holding_buffer(struct mgsl_struct *info)
4053 if ( info->tx_holding_count ) {
4054 /* determine if we have enough tx dma buffers
4055 * to accommodate the next tx frame
4057 struct tx_holding_buffer *ptx =
4058 &info->tx_holding_buffers[info->get_tx_holding_index];
4059 int num_free = num_free_tx_dma_buffers(info);
4060 int num_needed = ptx->buffer_size / DMABUFFERSIZE;
4061 if ( ptx->buffer_size % DMABUFFERSIZE )
4064 if (num_needed <= num_free) {
4065 info->xmit_cnt = ptx->buffer_size;
4066 mgsl_load_tx_dma_buffer(info,ptx->buffer,ptx->buffer_size);
4068 --info->tx_holding_count;
4069 if ( ++info->get_tx_holding_index >= info->num_tx_holding_buffers)
4070 info->get_tx_holding_index=0;
4072 /* restart transmit timer */
4073 mod_timer(&info->tx_timer, jiffies + msecs_to_jiffies(5000));
4083 * save_tx_buffer_request()
4085 * attempt to store transmit frame request for later transmission
4089 * info pointer to device instance data
4090 * Buffer pointer to buffer containing frame to load
4091 * BufferSize size in bytes of frame in Buffer
4093 * Return Value: 1 if able to store, 0 otherwise
4095 static int save_tx_buffer_request(struct mgsl_struct *info,const char *Buffer, unsigned int BufferSize)
4097 struct tx_holding_buffer *ptx;
4099 if ( info->tx_holding_count >= info->num_tx_holding_buffers ) {
4100 return 0; /* all buffers in use */
4103 ptx = &info->tx_holding_buffers[info->put_tx_holding_index];
4104 ptx->buffer_size = BufferSize;
4105 memcpy( ptx->buffer, Buffer, BufferSize);
4107 ++info->tx_holding_count;
4108 if ( ++info->put_tx_holding_index >= info->num_tx_holding_buffers)
4109 info->put_tx_holding_index=0;
4114 static int mgsl_claim_resources(struct mgsl_struct *info)
4116 if (request_region(info->io_base,info->io_addr_size,"synclink") == NULL) {
4117 printk( "%s(%d):I/O address conflict on device %s Addr=%08X\n",
4118 __FILE__,__LINE__,info->device_name, info->io_base);
4121 info->io_addr_requested = true;
4123 if ( request_irq(info->irq_level,mgsl_interrupt,info->irq_flags,
4124 info->device_name, info ) < 0 ) {
4125 printk( "%s(%d):Cant request interrupt on device %s IRQ=%d\n",
4126 __FILE__,__LINE__,info->device_name, info->irq_level );
4129 info->irq_requested = true;
4131 if ( info->bus_type == MGSL_BUS_TYPE_PCI ) {
4132 if (request_mem_region(info->phys_memory_base,0x40000,"synclink") == NULL) {
4133 printk( "%s(%d):mem addr conflict device %s Addr=%08X\n",
4134 __FILE__,__LINE__,info->device_name, info->phys_memory_base);
4137 info->shared_mem_requested = true;
4138 if (request_mem_region(info->phys_lcr_base + info->lcr_offset,128,"synclink") == NULL) {
4139 printk( "%s(%d):lcr mem addr conflict device %s Addr=%08X\n",
4140 __FILE__,__LINE__,info->device_name, info->phys_lcr_base + info->lcr_offset);
4143 info->lcr_mem_requested = true;
4145 info->memory_base = ioremap_nocache(info->phys_memory_base,
4147 if (!info->memory_base) {
4148 printk( "%s(%d):Cant map shared memory on device %s MemAddr=%08X\n",
4149 __FILE__,__LINE__,info->device_name, info->phys_memory_base );
4153 if ( !mgsl_memory_test(info) ) {
4154 printk( "%s(%d):Failed shared memory test %s MemAddr=%08X\n",
4155 __FILE__,__LINE__,info->device_name, info->phys_memory_base );
4159 info->lcr_base = ioremap_nocache(info->phys_lcr_base,
4161 if (!info->lcr_base) {
4162 printk( "%s(%d):Cant map LCR memory on device %s MemAddr=%08X\n",
4163 __FILE__,__LINE__,info->device_name, info->phys_lcr_base );
4166 info->lcr_base += info->lcr_offset;
4169 /* claim DMA channel */
4171 if (request_dma(info->dma_level,info->device_name) < 0){
4172 printk( "%s(%d):Cant request DMA channel on device %s DMA=%d\n",
4173 __FILE__,__LINE__,info->device_name, info->dma_level );
4174 mgsl_release_resources( info );
4177 info->dma_requested = true;
4179 /* ISA adapter uses bus master DMA */
4180 set_dma_mode(info->dma_level,DMA_MODE_CASCADE);
4181 enable_dma(info->dma_level);
4184 if ( mgsl_allocate_dma_buffers(info) < 0 ) {
4185 printk( "%s(%d):Cant allocate DMA buffers on device %s DMA=%d\n",
4186 __FILE__,__LINE__,info->device_name, info->dma_level );
4192 mgsl_release_resources(info);
4195 } /* end of mgsl_claim_resources() */
4197 static void mgsl_release_resources(struct mgsl_struct *info)
4199 if ( debug_level >= DEBUG_LEVEL_INFO )
4200 printk( "%s(%d):mgsl_release_resources(%s) entry\n",
4201 __FILE__,__LINE__,info->device_name );
4203 if ( info->irq_requested ) {
4204 free_irq(info->irq_level, info);
4205 info->irq_requested = false;
4207 if ( info->dma_requested ) {
4208 disable_dma(info->dma_level);
4209 free_dma(info->dma_level);
4210 info->dma_requested = false;
4212 mgsl_free_dma_buffers(info);
4213 mgsl_free_intermediate_rxbuffer_memory(info);
4214 mgsl_free_intermediate_txbuffer_memory(info);
4216 if ( info->io_addr_requested ) {
4217 release_region(info->io_base,info->io_addr_size);
4218 info->io_addr_requested = false;
4220 if ( info->shared_mem_requested ) {
4221 release_mem_region(info->phys_memory_base,0x40000);
4222 info->shared_mem_requested = false;
4224 if ( info->lcr_mem_requested ) {
4225 release_mem_region(info->phys_lcr_base + info->lcr_offset,128);
4226 info->lcr_mem_requested = false;
4228 if (info->memory_base){
4229 iounmap(info->memory_base);
4230 info->memory_base = NULL;
4232 if (info->lcr_base){
4233 iounmap(info->lcr_base - info->lcr_offset);
4234 info->lcr_base = NULL;
4237 if ( debug_level >= DEBUG_LEVEL_INFO )
4238 printk( "%s(%d):mgsl_release_resources(%s) exit\n",
4239 __FILE__,__LINE__,info->device_name );
4241 } /* end of mgsl_release_resources() */
4243 /* mgsl_add_device()
4245 * Add the specified device instance data structure to the
4246 * global linked list of devices and increment the device count.
4248 * Arguments: info pointer to device instance data
4249 * Return Value: None
4251 static void mgsl_add_device( struct mgsl_struct *info )
4253 info->next_device = NULL;
4254 info->line = mgsl_device_count;
4255 sprintf(info->device_name,"ttySL%d",info->line);
4257 if (info->line < MAX_TOTAL_DEVICES) {
4258 if (maxframe[info->line])
4259 info->max_frame_size = maxframe[info->line];
4260 info->dosyncppp = dosyncppp[info->line];
4262 if (txdmabufs[info->line]) {
4263 info->num_tx_dma_buffers = txdmabufs[info->line];
4264 if (info->num_tx_dma_buffers < 1)
4265 info->num_tx_dma_buffers = 1;
4268 if (txholdbufs[info->line]) {
4269 info->num_tx_holding_buffers = txholdbufs[info->line];
4270 if (info->num_tx_holding_buffers < 1)
4271 info->num_tx_holding_buffers = 1;
4272 else if (info->num_tx_holding_buffers > MAX_TX_HOLDING_BUFFERS)
4273 info->num_tx_holding_buffers = MAX_TX_HOLDING_BUFFERS;
4277 mgsl_device_count++;
4279 if ( !mgsl_device_list )
4280 mgsl_device_list = info;
4282 struct mgsl_struct *current_dev = mgsl_device_list;
4283 while( current_dev->next_device )
4284 current_dev = current_dev->next_device;
4285 current_dev->next_device = info;
4288 if ( info->max_frame_size < 4096 )
4289 info->max_frame_size = 4096;
4290 else if ( info->max_frame_size > 65535 )
4291 info->max_frame_size = 65535;
4293 if ( info->bus_type == MGSL_BUS_TYPE_PCI ) {
4294 printk( "SyncLink PCI v%d %s: IO=%04X IRQ=%d Mem=%08X,%08X MaxFrameSize=%u\n",
4295 info->hw_version + 1, info->device_name, info->io_base, info->irq_level,
4296 info->phys_memory_base, info->phys_lcr_base,
4297 info->max_frame_size );
4299 printk( "SyncLink ISA %s: IO=%04X IRQ=%d DMA=%d MaxFrameSize=%u\n",
4300 info->device_name, info->io_base, info->irq_level, info->dma_level,
4301 info->max_frame_size );
4304 #if SYNCLINK_GENERIC_HDLC
4308 } /* end of mgsl_add_device() */
4310 /* mgsl_allocate_device()
4312 * Allocate and initialize a device instance structure
4315 * Return Value: pointer to mgsl_struct if success, otherwise NULL
4317 static struct mgsl_struct* mgsl_allocate_device(void)
4319 struct mgsl_struct *info;
4321 info = kzalloc(sizeof(struct mgsl_struct),
4325 printk("Error can't allocate device instance data\n");
4327 tty_port_init(&info->port);
4328 info->magic = MGSL_MAGIC;
4329 INIT_WORK(&info->task, mgsl_bh_handler);
4330 info->max_frame_size = 4096;
4331 info->port.close_delay = 5*HZ/10;
4332 info->port.closing_wait = 30*HZ;
4333 init_waitqueue_head(&info->status_event_wait_q);
4334 init_waitqueue_head(&info->event_wait_q);
4335 spin_lock_init(&info->irq_spinlock);
4336 spin_lock_init(&info->netlock);
4337 memcpy(&info->params,&default_params,sizeof(MGSL_PARAMS));
4338 info->idle_mode = HDLC_TXIDLE_FLAGS;
4339 info->num_tx_dma_buffers = 1;
4340 info->num_tx_holding_buffers = 0;
4345 } /* end of mgsl_allocate_device()*/
4347 static const struct tty_operations mgsl_ops = {
4349 .close = mgsl_close,
4350 .write = mgsl_write,
4351 .put_char = mgsl_put_char,
4352 .flush_chars = mgsl_flush_chars,
4353 .write_room = mgsl_write_room,
4354 .chars_in_buffer = mgsl_chars_in_buffer,
4355 .flush_buffer = mgsl_flush_buffer,
4356 .ioctl = mgsl_ioctl,
4357 .throttle = mgsl_throttle,
4358 .unthrottle = mgsl_unthrottle,
4359 .send_xchar = mgsl_send_xchar,
4360 .break_ctl = mgsl_break,
4361 .wait_until_sent = mgsl_wait_until_sent,
4362 .read_proc = mgsl_read_proc,
4363 .set_termios = mgsl_set_termios,
4365 .start = mgsl_start,
4366 .hangup = mgsl_hangup,
4367 .tiocmget = tiocmget,
4368 .tiocmset = tiocmset,
4372 * perform tty device initialization
4374 static int mgsl_init_tty(void)
4378 serial_driver = alloc_tty_driver(128);
4382 serial_driver->owner = THIS_MODULE;
4383 serial_driver->driver_name = "synclink";
4384 serial_driver->name = "ttySL";
4385 serial_driver->major = ttymajor;
4386 serial_driver->minor_start = 64;
4387 serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
4388 serial_driver->subtype = SERIAL_TYPE_NORMAL;
4389 serial_driver->init_termios = tty_std_termios;
4390 serial_driver->init_termios.c_cflag =
4391 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
4392 serial_driver->init_termios.c_ispeed = 9600;
4393 serial_driver->init_termios.c_ospeed = 9600;
4394 serial_driver->flags = TTY_DRIVER_REAL_RAW;
4395 tty_set_operations(serial_driver, &mgsl_ops);
4396 if ((rc = tty_register_driver(serial_driver)) < 0) {
4397 printk("%s(%d):Couldn't register serial driver\n",
4399 put_tty_driver(serial_driver);
4400 serial_driver = NULL;
4404 printk("%s %s, tty major#%d\n",
4405 driver_name, driver_version,
4406 serial_driver->major);
4410 /* enumerate user specified ISA adapters
4412 static void mgsl_enum_isa_devices(void)
4414 struct mgsl_struct *info;
4417 /* Check for user specified ISA devices */
4419 for (i=0 ;(i < MAX_ISA_DEVICES) && io[i] && irq[i]; i++){
4420 if ( debug_level >= DEBUG_LEVEL_INFO )
4421 printk("ISA device specified io=%04X,irq=%d,dma=%d\n",
4422 io[i], irq[i], dma[i] );
4424 info = mgsl_allocate_device();
4426 /* error allocating device instance data */
4427 if ( debug_level >= DEBUG_LEVEL_ERROR )
4428 printk( "can't allocate device instance data.\n");
4432 /* Copy user configuration info to device instance data */
4433 info->io_base = (unsigned int)io[i];
4434 info->irq_level = (unsigned int)irq[i];
4435 info->irq_level = irq_canonicalize(info->irq_level);
4436 info->dma_level = (unsigned int)dma[i];
4437 info->bus_type = MGSL_BUS_TYPE_ISA;
4438 info->io_addr_size = 16;
4439 info->irq_flags = 0;
4441 mgsl_add_device( info );
4445 static void synclink_cleanup(void)
4448 struct mgsl_struct *info;
4449 struct mgsl_struct *tmp;
4451 printk("Unloading %s: %s\n", driver_name, driver_version);
4453 if (serial_driver) {
4454 if ((rc = tty_unregister_driver(serial_driver)))
4455 printk("%s(%d) failed to unregister tty driver err=%d\n",
4456 __FILE__,__LINE__,rc);
4457 put_tty_driver(serial_driver);
4460 info = mgsl_device_list;
4462 #if SYNCLINK_GENERIC_HDLC
4465 mgsl_release_resources(info);
4467 info = info->next_device;
4472 pci_unregister_driver(&synclink_pci_driver);
4475 static int __init synclink_init(void)
4479 if (break_on_load) {
4480 mgsl_get_text_ptr();
4484 printk("%s %s\n", driver_name, driver_version);
4486 mgsl_enum_isa_devices();
4487 if ((rc = pci_register_driver(&synclink_pci_driver)) < 0)
4488 printk("%s:failed to register PCI driver, error=%d\n",__FILE__,rc);
4490 pci_registered = true;
4492 if ((rc = mgsl_init_tty()) < 0)
4502 static void __exit synclink_exit(void)
4507 module_init(synclink_init);
4508 module_exit(synclink_exit);
4513 * Issue a USC Receive/Transmit command to the
4514 * Channel Command/Address Register (CCAR).
4518 * The command is encoded in the most significant 5 bits <15..11>
4519 * of the CCAR value. Bits <10..7> of the CCAR must be preserved
4520 * and Bits <6..0> must be written as zeros.
4524 * info pointer to device information structure
4525 * Cmd command mask (use symbolic macros)
4531 static void usc_RTCmd( struct mgsl_struct *info, u16 Cmd )
4533 /* output command to CCAR in bits <15..11> */
4534 /* preserve bits <10..7>, bits <6..0> must be zero */
4536 outw( Cmd + info->loopback_bits, info->io_base + CCAR );
4538 /* Read to flush write to CCAR */
4539 if ( info->bus_type == MGSL_BUS_TYPE_PCI )
4540 inw( info->io_base + CCAR );
4542 } /* end of usc_RTCmd() */
4547 * Issue a DMA command to the DMA Command/Address Register (DCAR).
4551 * info pointer to device information structure
4552 * Cmd DMA command mask (usc_DmaCmd_XX Macros)
4558 static void usc_DmaCmd( struct mgsl_struct *info, u16 Cmd )
4560 /* write command mask to DCAR */
4561 outw( Cmd + info->mbre_bit, info->io_base );
4563 /* Read to flush write to DCAR */
4564 if ( info->bus_type == MGSL_BUS_TYPE_PCI )
4565 inw( info->io_base );
4567 } /* end of usc_DmaCmd() */
4572 * Write a 16-bit value to a USC DMA register
4576 * info pointer to device info structure
4577 * RegAddr register address (number) for write
4578 * RegValue 16-bit value to write to register
4585 static void usc_OutDmaReg( struct mgsl_struct *info, u16 RegAddr, u16 RegValue )
4587 /* Note: The DCAR is located at the adapter base address */
4588 /* Note: must preserve state of BIT8 in DCAR */
4590 outw( RegAddr + info->mbre_bit, info->io_base );
4591 outw( RegValue, info->io_base );
4593 /* Read to flush write to DCAR */
4594 if ( info->bus_type == MGSL_BUS_TYPE_PCI )
4595 inw( info->io_base );
4597 } /* end of usc_OutDmaReg() */
4602 * Read a 16-bit value from a DMA register
4606 * info pointer to device info structure
4607 * RegAddr register address (number) to read from
4611 * The 16-bit value read from register
4614 static u16 usc_InDmaReg( struct mgsl_struct *info, u16 RegAddr )
4616 /* Note: The DCAR is located at the adapter base address */
4617 /* Note: must preserve state of BIT8 in DCAR */
4619 outw( RegAddr + info->mbre_bit, info->io_base );
4620 return inw( info->io_base );
4622 } /* end of usc_InDmaReg() */
4628 * Write a 16-bit value to a USC serial channel register
4632 * info pointer to device info structure
4633 * RegAddr register address (number) to write to
4634 * RegValue 16-bit value to write to register
4641 static void usc_OutReg( struct mgsl_struct *info, u16 RegAddr, u16 RegValue )
4643 outw( RegAddr + info->loopback_bits, info->io_base + CCAR );
4644 outw( RegValue, info->io_base + CCAR );
4646 /* Read to flush write to CCAR */
4647 if ( info->bus_type == MGSL_BUS_TYPE_PCI )
4648 inw( info->io_base + CCAR );
4650 } /* end of usc_OutReg() */
4655 * Reads a 16-bit value from a USC serial channel register
4659 * info pointer to device extension
4660 * RegAddr register address (number) to read from
4664 * 16-bit value read from register
4666 static u16 usc_InReg( struct mgsl_struct *info, u16 RegAddr )
4668 outw( RegAddr + info->loopback_bits, info->io_base + CCAR );
4669 return inw( info->io_base + CCAR );
4671 } /* end of usc_InReg() */
4673 /* usc_set_sdlc_mode()
4675 * Set up the adapter for SDLC DMA communications.
4677 * Arguments: info pointer to device instance data
4678 * Return Value: NONE
4680 static void usc_set_sdlc_mode( struct mgsl_struct *info )
4686 * determine if the IUSC on the adapter is pre-SL1660. If
4687 * not, take advantage of the UnderWait feature of more
4688 * modern chips. If an underrun occurs and this bit is set,
4689 * the transmitter will idle the programmed idle pattern
4690 * until the driver has time to service the underrun. Otherwise,
4691 * the dma controller may get the cycles previously requested
4692 * and begin transmitting queued tx data.
4694 usc_OutReg(info,TMCR,0x1f);
4695 RegValue=usc_InReg(info,TMDR);
4696 PreSL1660 = (RegValue == IUSC_PRE_SL1660);
4698 if ( info->params.flags & HDLC_FLAG_HDLC_LOOPMODE )
4701 ** Channel Mode Register (CMR)
4703 ** <15..14> 10 Tx Sub Modes, Send Flag on Underrun
4704 ** <13> 0 0 = Transmit Disabled (initially)
4705 ** <12> 0 1 = Consecutive Idles share common 0
4706 ** <11..8> 1110 Transmitter Mode = HDLC/SDLC Loop
4707 ** <7..4> 0000 Rx Sub Modes, addr/ctrl field handling
4708 ** <3..0> 0110 Receiver Mode = HDLC/SDLC
4710 ** 1000 1110 0000 0110 = 0x8e06
4714 /*--------------------------------------------------
4715 * ignore user options for UnderRun Actions and
4717 *--------------------------------------------------*/
4721 /* Channel mode Register (CMR)
4723 * <15..14> 00 Tx Sub modes, Underrun Action
4724 * <13> 0 1 = Send Preamble before opening flag
4725 * <12> 0 1 = Consecutive Idles share common 0
4726 * <11..8> 0110 Transmitter mode = HDLC/SDLC
4727 * <7..4> 0000 Rx Sub modes, addr/ctrl field handling
4728 * <3..0> 0110 Receiver mode = HDLC/SDLC
4730 * 0000 0110 0000 0110 = 0x0606
4732 if (info->params.mode == MGSL_MODE_RAW) {
4733 RegValue = 0x0001; /* Set Receive mode = external sync */
4735 usc_OutReg( info, IOCR, /* Set IOCR DCD is RxSync Detect Input */
4736 (unsigned short)((usc_InReg(info, IOCR) & ~(BIT13|BIT12)) | BIT12));
4740 * CMR <15> 0 Don't send CRC on Tx Underrun
4741 * CMR <14> x undefined
4742 * CMR <13> 0 Send preamble before openning sync
4743 * CMR <12> 0 Send 8-bit syncs, 1=send Syncs per TxLength
4746 * CMR <11-8) 0100 MonoSync
4748 * 0x00 0100 xxxx xxxx 04xx
4756 if ( info->params.flags & HDLC_FLAG_UNDERRUN_ABORT15 )
4758 else if ( info->params.flags & HDLC_FLAG_UNDERRUN_FLAG )
4760 else if ( info->params.flags & HDLC_FLAG_UNDERRUN_CRC )
4761 RegValue |= BIT15 + BIT14;
4764 if ( info->params.preamble != HDLC_PREAMBLE_PATTERN_NONE )
4768 if ( info->params.mode == MGSL_MODE_HDLC &&
4769 (info->params.flags & HDLC_FLAG_SHARE_ZERO) )
4772 if ( info->params.addr_filter != 0xff )
4774 /* set up receive address filtering */
4775 usc_OutReg( info, RSR, info->params.addr_filter );
4779 usc_OutReg( info, CMR, RegValue );
4780 info->cmr_value = RegValue;
4782 /* Receiver mode Register (RMR)
4784 * <15..13> 000 encoding
4785 * <12..11> 00 FCS = 16bit CRC CCITT (x15 + x12 + x5 + 1)
4786 * <10> 1 1 = Set CRC to all 1s (use for SDLC/HDLC)
4787 * <9> 0 1 = Include Receive chars in CRC
4788 * <8> 1 1 = Use Abort/PE bit as abort indicator
4789 * <7..6> 00 Even parity
4790 * <5> 0 parity disabled
4791 * <4..2> 000 Receive Char Length = 8 bits
4792 * <1..0> 00 Disable Receiver
4794 * 0000 0101 0000 0000 = 0x0500
4799 switch ( info->params.encoding ) {
4800 case HDLC_ENCODING_NRZB: RegValue |= BIT13; break;
4801 case HDLC_ENCODING_NRZI_MARK: RegValue |= BIT14; break;
4802 case HDLC_ENCODING_NRZI_SPACE: RegValue |= BIT14 + BIT13; break;
4803 case HDLC_ENCODING_BIPHASE_MARK: RegValue |= BIT15; break;
4804 case HDLC_ENCODING_BIPHASE_SPACE: RegValue |= BIT15 + BIT13; break;
4805 case HDLC_ENCODING_BIPHASE_LEVEL: RegValue |= BIT15 + BIT14; break;
4806 case HDLC_ENCODING_DIFF_BIPHASE_LEVEL: RegValue |= BIT15 + BIT14 + BIT13; break;
4809 if ( (info->params.crc_type & HDLC_CRC_MASK) == HDLC_CRC_16_CCITT )
4811 else if ( (info->params.crc_type & HDLC_CRC_MASK) == HDLC_CRC_32_CCITT )
4812 RegValue |= ( BIT12 | BIT10 | BIT9 );
4814 usc_OutReg( info, RMR, RegValue );
4816 /* Set the Receive count Limit Register (RCLR) to 0xffff. */
4817 /* When an opening flag of an SDLC frame is recognized the */
4818 /* Receive Character count (RCC) is loaded with the value in */
4819 /* RCLR. The RCC is decremented for each received byte. The */
4820 /* value of RCC is stored after the closing flag of the frame */
4821 /* allowing the frame size to be computed. */
4823 usc_OutReg( info, RCLR, RCLRVALUE );
4825 usc_RCmd( info, RCmd_SelectRicrdma_level );
4827 /* Receive Interrupt Control Register (RICR)
4829 * <15..8> ? RxFIFO DMA Request Level
4830 * <7> 0 Exited Hunt IA (Interrupt Arm)
4831 * <6> 0 Idle Received IA
4832 * <5> 0 Break/Abort IA
4834 * <3> 1 Queued status reflects oldest 2 bytes in FIFO
4836 * <1> 1 Rx Overrun IA
4837 * <0> 0 Select TC0 value for readback
4839 * 0000 0000 0000 1000 = 0x000a
4842 /* Carry over the Exit Hunt and Idle Received bits */
4843 /* in case they have been armed by usc_ArmEvents. */
4845 RegValue = usc_InReg( info, RICR ) & 0xc0;
4847 if ( info->bus_type == MGSL_BUS_TYPE_PCI )
4848 usc_OutReg( info, RICR, (u16)(0x030a | RegValue) );
4850 usc_OutReg( info, RICR, (u16)(0x140a | RegValue) );
4852 /* Unlatch all Rx status bits and clear Rx status IRQ Pending */
4854 usc_UnlatchRxstatusBits( info, RXSTATUS_ALL );
4855 usc_ClearIrqPendingBits( info, RECEIVE_STATUS );
4857 /* Transmit mode Register (TMR)
4859 * <15..13> 000 encoding
4860 * <12..11> 00 FCS = 16bit CRC CCITT (x15 + x12 + x5 + 1)
4861 * <10> 1 1 = Start CRC as all 1s (use for SDLC/HDLC)
4862 * <9> 0 1 = Tx CRC Enabled
4863 * <8> 0 1 = Append CRC to end of transmit frame
4864 * <7..6> 00 Transmit parity Even
4865 * <5> 0 Transmit parity Disabled
4866 * <4..2> 000 Tx Char Length = 8 bits
4867 * <1..0> 00 Disable Transmitter
4869 * 0000 0100 0000 0000 = 0x0400
4874 switch ( info->params.encoding ) {
4875 case HDLC_ENCODING_NRZB: RegValue |= BIT13; break;
4876 case HDLC_ENCODING_NRZI_MARK: RegValue |= BIT14; break;
4877 case HDLC_ENCODING_NRZI_SPACE: RegValue |= BIT14 + BIT13; break;
4878 case HDLC_ENCODING_BIPHASE_MARK: RegValue |= BIT15; break;
4879 case HDLC_ENCODING_BIPHASE_SPACE: RegValue |= BIT15 + BIT13; break;
4880 case HDLC_ENCODING_BIPHASE_LEVEL: RegValue |= BIT15 + BIT14; break;
4881 case HDLC_ENCODING_DIFF_BIPHASE_LEVEL: RegValue |= BIT15 + BIT14 + BIT13; break;
4884 if ( (info->params.crc_type & HDLC_CRC_MASK) == HDLC_CRC_16_CCITT )
4885 RegValue |= BIT9 + BIT8;
4886 else if ( (info->params.crc_type & HDLC_CRC_MASK) == HDLC_CRC_32_CCITT )
4887 RegValue |= ( BIT12 | BIT10 | BIT9 | BIT8);
4889 usc_OutReg( info, TMR, RegValue );
4891 usc_set_txidle( info );
4894 usc_TCmd( info, TCmd_SelectTicrdma_level );
4896 /* Transmit Interrupt Control Register (TICR)
4898 * <15..8> ? Transmit FIFO DMA Level
4899 * <7> 0 Present IA (Interrupt Arm)
4900 * <6> 0 Idle Sent IA
4901 * <5> 1 Abort Sent IA
4902 * <4> 1 EOF/EOM Sent IA
4904 * <2> 1 1 = Wait for SW Trigger to Start Frame
4905 * <1> 1 Tx Underrun IA
4906 * <0> 0 TC0 constant on read back
4908 * 0000 0000 0011 0110 = 0x0036
4911 if ( info->bus_type == MGSL_BUS_TYPE_PCI )
4912 usc_OutReg( info, TICR, 0x0736 );
4914 usc_OutReg( info, TICR, 0x1436 );
4916 usc_UnlatchTxstatusBits( info, TXSTATUS_ALL );
4917 usc_ClearIrqPendingBits( info, TRANSMIT_STATUS );
4920 ** Transmit Command/Status Register (TCSR)
4922 ** <15..12> 0000 TCmd
4923 ** <11> 0/1 UnderWait
4924 ** <10..08> 000 TxIdle
4928 ** <4> x EOF/EOM Sent
4934 ** 0000 0000 0000 0000 = 0x0000
4936 info->tcsr_value = 0;
4939 info->tcsr_value |= TCSR_UNDERWAIT;
4941 usc_OutReg( info, TCSR, info->tcsr_value );
4943 /* Clock mode Control Register (CMCR)
4945 * <15..14> 00 counter 1 Source = Disabled
4946 * <13..12> 00 counter 0 Source = Disabled
4947 * <11..10> 11 BRG1 Input is TxC Pin
4948 * <9..8> 11 BRG0 Input is TxC Pin
4949 * <7..6> 01 DPLL Input is BRG1 Output
4950 * <5..3> XXX TxCLK comes from Port 0
4951 * <2..0> XXX RxCLK comes from Port 1
4953 * 0000 1111 0111 0111 = 0x0f77
4958 if ( info->params.flags & HDLC_FLAG_RXC_DPLL )
4959 RegValue |= 0x0003; /* RxCLK from DPLL */
4960 else if ( info->params.flags & HDLC_FLAG_RXC_BRG )
4961 RegValue |= 0x0004; /* RxCLK from BRG0 */
4962 else if ( info->params.flags & HDLC_FLAG_RXC_TXCPIN)
4963 RegValue |= 0x0006; /* RxCLK from TXC Input */
4965 RegValue |= 0x0007; /* RxCLK from Port1 */
4967 if ( info->params.flags & HDLC_FLAG_TXC_DPLL )
4968 RegValue |= 0x0018; /* TxCLK from DPLL */
4969 else if ( info->params.flags & HDLC_FLAG_TXC_BRG )
4970 RegValue |= 0x0020; /* TxCLK from BRG0 */
4971 else if ( info->params.flags & HDLC_FLAG_TXC_RXCPIN)
4972 RegValue |= 0x0038; /* RxCLK from TXC Input */
4974 RegValue |= 0x0030; /* TxCLK from Port0 */
4976 usc_OutReg( info, CMCR, RegValue );
4979 /* Hardware Configuration Register (HCR)
4981 * <15..14> 00 CTR0 Divisor:00=32,01=16,10=8,11=4
4982 * <13> 0 CTR1DSel:0=CTR0Div determines CTR0Div
4983 * <12> 0 CVOK:0=report code violation in biphase
4984 * <11..10> 00 DPLL Divisor:00=32,01=16,10=8,11=4
4985 * <9..8> XX DPLL mode:00=disable,01=NRZ,10=Biphase,11=Biphase Level
4986 * <7..6> 00 reserved
4987 * <5> 0 BRG1 mode:0=continuous,1=single cycle
4989 * <3..2> 00 reserved
4990 * <1> 0 BRG0 mode:0=continuous,1=single cycle
4996 if ( info->params.flags & (HDLC_FLAG_RXC_DPLL + HDLC_FLAG_TXC_DPLL) ) {
5001 /* DPLL is enabled. Use BRG1 to provide continuous reference clock */
5002 /* for DPLL. DPLL mode in HCR is dependent on the encoding used. */
5004 if ( info->bus_type == MGSL_BUS_TYPE_PCI )
5005 XtalSpeed = 11059200;
5007 XtalSpeed = 14745600;
5009 if ( info->params.flags & HDLC_FLAG_DPLL_DIV16 ) {
5013 else if ( info->params.flags & HDLC_FLAG_DPLL_DIV8 ) {
5020 /* Tc = (Xtal/Speed) - 1 */
5021 /* If twice the remainder of (Xtal/Speed) is greater than Speed */
5022 /* then rounding up gives a more precise time constant. Instead */
5023 /* of rounding up and then subtracting 1 we just don't subtract */
5024 /* the one in this case. */
5026 /*--------------------------------------------------
5027 * ejz: for DPLL mode, application should use the
5028 * same clock speed as the partner system, even
5029 * though clocking is derived from the input RxData.
5030 * In case the user uses a 0 for the clock speed,
5031 * default to 0xffffffff and don't try to divide by
5033 *--------------------------------------------------*/
5034 if ( info->params.clock_speed )
5036 Tc = (u16)((XtalSpeed/DpllDivisor)/info->params.clock_speed);
5037 if ( !((((XtalSpeed/DpllDivisor) % info->params.clock_speed) * 2)
5038 / info->params.clock_speed) )
5045 /* Write 16-bit Time Constant for BRG1 */
5046 usc_OutReg( info, TC1R, Tc );
5048 RegValue |= BIT4; /* enable BRG1 */
5050 switch ( info->params.encoding ) {
5051 case HDLC_ENCODING_NRZ:
5052 case HDLC_ENCODING_NRZB:
5053 case HDLC_ENCODING_NRZI_MARK:
5054 case HDLC_ENCODING_NRZI_SPACE: RegValue |= BIT8; break;
5055 case HDLC_ENCODING_BIPHASE_MARK:
5056 case HDLC_ENCODING_BIPHASE_SPACE: RegValue |= BIT9; break;
5057 case HDLC_ENCODING_BIPHASE_LEVEL:
5058 case HDLC_ENCODING_DIFF_BIPHASE_LEVEL: RegValue |= BIT9 + BIT8; break;
5062 usc_OutReg( info, HCR, RegValue );
5065 /* Channel Control/status Register (CCSR)
5067 * <15> X RCC FIFO Overflow status (RO)
5068 * <14> X RCC FIFO Not Empty status (RO)
5069 * <13> 0 1 = Clear RCC FIFO (WO)
5070 * <12> X DPLL Sync (RW)
5071 * <11> X DPLL 2 Missed Clocks status (RO)
5072 * <10> X DPLL 1 Missed Clock status (RO)
5073 * <9..8> 00 DPLL Resync on rising and falling edges (RW)
5074 * <7> X SDLC Loop On status (RO)
5075 * <6> X SDLC Loop Send status (RO)
5076 * <5> 1 Bypass counters for TxClk and RxClk (RW)
5077 * <4..2> 000 Last Char of SDLC frame has 8 bits (RW)
5078 * <1..0> 00 reserved
5080 * 0000 0000 0010 0000 = 0x0020
5083 usc_OutReg( info, CCSR, 0x1020 );
5086 if ( info->params.flags & HDLC_FLAG_AUTO_CTS ) {
5087 usc_OutReg( info, SICR,
5088 (u16)(usc_InReg(info,SICR) | SICR_CTS_INACTIVE) );
5092 /* enable Master Interrupt Enable bit (MIE) */
5093 usc_EnableMasterIrqBit( info );
5095 usc_ClearIrqPendingBits( info, RECEIVE_STATUS + RECEIVE_DATA +
5096 TRANSMIT_STATUS + TRANSMIT_DATA + MISC);
5098 /* arm RCC underflow interrupt */
5099 usc_OutReg(info, SICR, (u16)(usc_InReg(info,SICR) | BIT3));
5100 usc_EnableInterrupts(info, MISC);
5103 outw( 0, info->io_base ); /* clear Master Bus Enable (DCAR) */
5104 usc_DmaCmd( info, DmaCmd_ResetAllChannels ); /* disable both DMA channels */
5105 info->mbre_bit = BIT8;
5106 outw( BIT8, info->io_base ); /* set Master Bus Enable (DCAR) */
5108 if (info->bus_type == MGSL_BUS_TYPE_ISA) {
5109 /* Enable DMAEN (Port 7, Bit 14) */
5110 /* This connects the DMA request signal to the ISA bus */
5111 usc_OutReg(info, PCR, (u16)((usc_InReg(info, PCR) | BIT15) & ~BIT14));
5114 /* DMA Control Register (DCR)
5116 * <15..14> 10 Priority mode = Alternating Tx/Rx
5117 * 01 Rx has priority
5118 * 00 Tx has priority
5120 * <13> 1 Enable Priority Preempt per DCR<15..14>
5121 * (WARNING DCR<11..10> must be 00 when this is 1)
5122 * 0 Choose activate channel per DCR<11..10>
5124 * <12> 0 Little Endian for Array/List
5125 * <11..10> 00 Both Channels can use each bus grant
5126 * <9..6> 0000 reserved
5127 * <5> 0 7 CLK - Minimum Bus Re-request Interval
5128 * <4> 0 1 = drive D/C and S/D pins
5129 * <3> 1 1 = Add one wait state to all DMA cycles.
5130 * <2> 0 1 = Strobe /UAS on every transfer.
5131 * <1..0> 11 Addr incrementing only affects LS24 bits
5133 * 0110 0000 0000 1011 = 0x600b
5136 if ( info->bus_type == MGSL_BUS_TYPE_PCI ) {
5137 /* PCI adapter does not need DMA wait state */
5138 usc_OutDmaReg( info, DCR, 0xa00b );
5141 usc_OutDmaReg( info, DCR, 0x800b );
5144 /* Receive DMA mode Register (RDMR)
5146 * <15..14> 11 DMA mode = Linked List Buffer mode
5147 * <13> 1 RSBinA/L = store Rx status Block in Arrary/List entry
5148 * <12> 1 Clear count of List Entry after fetching
5149 * <11..10> 00 Address mode = Increment
5150 * <9> 1 Terminate Buffer on RxBound
5151 * <8> 0 Bus Width = 16bits
5152 * <7..0> ? status Bits (write as 0s)
5154 * 1111 0010 0000 0000 = 0xf200
5157 usc_OutDmaReg( info, RDMR, 0xf200 );
5160 /* Transmit DMA mode Register (TDMR)
5162 * <15..14> 11 DMA mode = Linked List Buffer mode
5163 * <13> 1 TCBinA/L = fetch Tx Control Block from List entry
5164 * <12> 1 Clear count of List Entry after fetching
5165 * <11..10> 00 Address mode = Increment
5166 * <9> 1 Terminate Buffer on end of frame
5167 * <8> 0 Bus Width = 16bits
5168 * <7..0> ? status Bits (Read Only so write as 0)
5170 * 1111 0010 0000 0000 = 0xf200
5173 usc_OutDmaReg( info, TDMR, 0xf200 );
5176 /* DMA Interrupt Control Register (DICR)
5178 * <15> 1 DMA Interrupt Enable
5179 * <14> 0 1 = Disable IEO from USC
5180 * <13> 0 1 = Don't provide vector during IntAck
5181 * <12> 1 1 = Include status in Vector
5182 * <10..2> 0 reserved, Must be 0s
5183 * <1> 0 1 = Rx DMA Interrupt Enabled
5184 * <0> 0 1 = Tx DMA Interrupt Enabled
5186 * 1001 0000 0000 0000 = 0x9000
5189 usc_OutDmaReg( info, DICR, 0x9000 );
5191 usc_InDmaReg( info, RDMR ); /* clear pending receive DMA IRQ bits */
5192 usc_InDmaReg( info, TDMR ); /* clear pending transmit DMA IRQ bits */
5193 usc_OutDmaReg( info, CDIR, 0x0303 ); /* clear IUS and Pending for Tx and Rx */
5195 /* Channel Control Register (CCR)
5197 * <15..14> 10 Use 32-bit Tx Control Blocks (TCBs)
5198 * <13> 0 Trigger Tx on SW Command Disabled
5199 * <12> 0 Flag Preamble Disabled
5200 * <11..10> 00 Preamble Length
5201 * <9..8> 00 Preamble Pattern
5202 * <7..6> 10 Use 32-bit Rx status Blocks (RSBs)
5203 * <5> 0 Trigger Rx on SW Command Disabled
5206 * 1000 0000 1000 0000 = 0x8080
5211 switch ( info->params.preamble_length ) {
5212 case HDLC_PREAMBLE_LENGTH_16BITS: RegValue |= BIT10; break;
5213 case HDLC_PREAMBLE_LENGTH_32BITS: RegValue |= BIT11; break;
5214 case HDLC_PREAMBLE_LENGTH_64BITS: RegValue |= BIT11 + BIT10; break;
5217 switch ( info->params.preamble ) {
5218 case HDLC_PREAMBLE_PATTERN_FLAGS: RegValue |= BIT8 + BIT12; break;
5219 case HDLC_PREAMBLE_PATTERN_ONES: RegValue |= BIT8; break;
5220 case HDLC_PREAMBLE_PATTERN_10: RegValue |= BIT9; break;
5221 case HDLC_PREAMBLE_PATTERN_01: RegValue |= BIT9 + BIT8; break;
5224 usc_OutReg( info, CCR, RegValue );
5228 * Burst/Dwell Control Register
5230 * <15..8> 0x20 Maximum number of transfers per bus grant
5231 * <7..0> 0x00 Maximum number of clock cycles per bus grant
5234 if ( info->bus_type == MGSL_BUS_TYPE_PCI ) {
5235 /* don't limit bus occupancy on PCI adapter */
5236 usc_OutDmaReg( info, BDCR, 0x0000 );
5239 usc_OutDmaReg( info, BDCR, 0x2000 );
5241 usc_stop_transmitter(info);
5242 usc_stop_receiver(info);
5244 } /* end of usc_set_sdlc_mode() */
5246 /* usc_enable_loopback()
5248 * Set the 16C32 for internal loopback mode.
5249 * The TxCLK and RxCLK signals are generated from the BRG0 and
5250 * the TxD is looped back to the RxD internally.
5252 * Arguments: info pointer to device instance data
5253 * enable 1 = enable loopback, 0 = disable
5254 * Return Value: None
5256 static void usc_enable_loopback(struct mgsl_struct *info, int enable)
5259 /* blank external TXD output */
5260 usc_OutReg(info,IOCR,usc_InReg(info,IOCR) | (BIT7+BIT6));
5262 /* Clock mode Control Register (CMCR)
5264 * <15..14> 00 counter 1 Disabled
5265 * <13..12> 00 counter 0 Disabled
5266 * <11..10> 11 BRG1 Input is TxC Pin
5267 * <9..8> 11 BRG0 Input is TxC Pin
5268 * <7..6> 01 DPLL Input is BRG1 Output
5269 * <5..3> 100 TxCLK comes from BRG0
5270 * <2..0> 100 RxCLK comes from BRG0
5272 * 0000 1111 0110 0100 = 0x0f64
5275 usc_OutReg( info, CMCR, 0x0f64 );
5277 /* Write 16-bit Time Constant for BRG0 */
5278 /* use clock speed if available, otherwise use 8 for diagnostics */
5279 if (info->params.clock_speed) {
5280 if (info->bus_type == MGSL_BUS_TYPE_PCI)
5281 usc_OutReg(info, TC0R, (u16)((11059200/info->params.clock_speed)-1));
5283 usc_OutReg(info, TC0R, (u16)((14745600/info->params.clock_speed)-1));
5285 usc_OutReg(info, TC0R, (u16)8);
5287 /* Hardware Configuration Register (HCR) Clear Bit 1, BRG0
5288 mode = Continuous Set Bit 0 to enable BRG0. */
5289 usc_OutReg( info, HCR, (u16)((usc_InReg( info, HCR ) & ~BIT1) | BIT0) );
5291 /* Input/Output Control Reg, <2..0> = 100, Drive RxC pin with BRG0 */
5292 usc_OutReg(info, IOCR, (u16)((usc_InReg(info, IOCR) & 0xfff8) | 0x0004));
5294 /* set Internal Data loopback mode */
5295 info->loopback_bits = 0x300;
5296 outw( 0x0300, info->io_base + CCAR );
5298 /* enable external TXD output */
5299 usc_OutReg(info,IOCR,usc_InReg(info,IOCR) & ~(BIT7+BIT6));
5301 /* clear Internal Data loopback mode */
5302 info->loopback_bits = 0;
5303 outw( 0,info->io_base + CCAR );
5306 } /* end of usc_enable_loopback() */
5308 /* usc_enable_aux_clock()
5310 * Enabled the AUX clock output at the specified frequency.
5314 * info pointer to device extension
5315 * data_rate data rate of clock in bits per second
5316 * A data rate of 0 disables the AUX clock.
5318 * Return Value: None
5320 static void usc_enable_aux_clock( struct mgsl_struct *info, u32 data_rate )
5326 if ( info->bus_type == MGSL_BUS_TYPE_PCI )
5327 XtalSpeed = 11059200;
5329 XtalSpeed = 14745600;
5332 /* Tc = (Xtal/Speed) - 1 */
5333 /* If twice the remainder of (Xtal/Speed) is greater than Speed */
5334 /* then rounding up gives a more precise time constant. Instead */
5335 /* of rounding up and then subtracting 1 we just don't subtract */
5336 /* the one in this case. */
5339 Tc = (u16)(XtalSpeed/data_rate);
5340 if ( !(((XtalSpeed % data_rate) * 2) / data_rate) )
5343 /* Write 16-bit Time Constant for BRG0 */
5344 usc_OutReg( info, TC0R, Tc );
5347 * Hardware Configuration Register (HCR)
5348 * Clear Bit 1, BRG0 mode = Continuous
5349 * Set Bit 0 to enable BRG0.
5352 usc_OutReg( info, HCR, (u16)((usc_InReg( info, HCR ) & ~BIT1) | BIT0) );
5354 /* Input/Output Control Reg, <2..0> = 100, Drive RxC pin with BRG0 */
5355 usc_OutReg( info, IOCR, (u16)((usc_InReg(info, IOCR) & 0xfff8) | 0x0004) );
5357 /* data rate == 0 so turn off BRG0 */
5358 usc_OutReg( info, HCR, (u16)(usc_InReg( info, HCR ) & ~BIT0) );
5361 } /* end of usc_enable_aux_clock() */
5365 * usc_process_rxoverrun_sync()
5367 * This function processes a receive overrun by resetting the
5368 * receive DMA buffers and issuing a Purge Rx FIFO command
5369 * to allow the receiver to continue receiving.
5373 * info pointer to device extension
5375 * Return Value: None
5377 static void usc_process_rxoverrun_sync( struct mgsl_struct *info )
5381 int frame_start_index;
5382 bool start_of_frame_found = false;
5383 bool end_of_frame_found = false;
5384 bool reprogram_dma = false;
5386 DMABUFFERENTRY *buffer_list = info->rx_buffer_list;
5389 usc_DmaCmd( info, DmaCmd_PauseRxChannel );
5390 usc_RCmd( info, RCmd_EnterHuntmode );
5391 usc_RTCmd( info, RTCmd_PurgeRxFifo );
5393 /* CurrentRxBuffer points to the 1st buffer of the next */
5394 /* possibly available receive frame. */
5396 frame_start_index = start_index = end_index = info->current_rx_buffer;
5398 /* Search for an unfinished string of buffers. This means */
5399 /* that a receive frame started (at least one buffer with */
5400 /* count set to zero) but there is no terminiting buffer */
5401 /* (status set to non-zero). */
5403 while( !buffer_list[end_index].count )
5405 /* Count field has been reset to zero by 16C32. */
5406 /* This buffer is currently in use. */
5408 if ( !start_of_frame_found )
5410 start_of_frame_found = true;
5411 frame_start_index = end_index;
5412 end_of_frame_found = false;
5415 if ( buffer_list[end_index].status )
5417 /* Status field has been set by 16C32. */
5418 /* This is the last buffer of a received frame. */
5420 /* We want to leave the buffers for this frame intact. */
5421 /* Move on to next possible frame. */
5423 start_of_frame_found = false;
5424 end_of_frame_found = true;
5427 /* advance to next buffer entry in linked list */
5429 if ( end_index == info->rx_buffer_count )
5432 if ( start_index == end_index )
5434 /* The entire list has been searched with all Counts == 0 and */
5435 /* all Status == 0. The receive buffers are */
5436 /* completely screwed, reset all receive buffers! */
5437 mgsl_reset_rx_dma_buffers( info );
5438 frame_start_index = 0;
5439 start_of_frame_found = false;
5440 reprogram_dma = true;
5445 if ( start_of_frame_found && !end_of_frame_found )
5447 /* There is an unfinished string of receive DMA buffers */
5448 /* as a result of the receiver overrun. */
5450 /* Reset the buffers for the unfinished frame */
5451 /* and reprogram the receive DMA controller to start */
5452 /* at the 1st buffer of unfinished frame. */
5454 start_index = frame_start_index;
5458 *((unsigned long *)&(info->rx_buffer_list[start_index++].count)) = DMABUFFERSIZE;
5460 /* Adjust index for wrap around. */
5461 if ( start_index == info->rx_buffer_count )
5464 } while( start_index != end_index );
5466 reprogram_dma = true;
5469 if ( reprogram_dma )
5471 usc_UnlatchRxstatusBits(info,RXSTATUS_ALL);
5472 usc_ClearIrqPendingBits(info, RECEIVE_DATA|RECEIVE_STATUS);
5473 usc_UnlatchRxstatusBits(info, RECEIVE_DATA|RECEIVE_STATUS);
5475 usc_EnableReceiver(info,DISABLE_UNCONDITIONAL);
5477 /* This empties the receive FIFO and loads the RCC with RCLR */
5478 usc_OutReg( info, CCSR, (u16)(usc_InReg(info,CCSR) | BIT13) );
5480 /* program 16C32 with physical address of 1st DMA buffer entry */
5481 phys_addr = info->rx_buffer_list[frame_start_index].phys_entry;
5482 usc_OutDmaReg( info, NRARL, (u16)phys_addr );
5483 usc_OutDmaReg( info, NRARU, (u16)(phys_addr >> 16) );
5485 usc_UnlatchRxstatusBits( info, RXSTATUS_ALL );
5486 usc_ClearIrqPendingBits( info, RECEIVE_DATA + RECEIVE_STATUS );
5487 usc_EnableInterrupts( info, RECEIVE_STATUS );
5489 /* 1. Arm End of Buffer (EOB) Receive DMA Interrupt (BIT2 of RDIAR) */
5490 /* 2. Enable Receive DMA Interrupts (BIT1 of DICR) */
5492 usc_OutDmaReg( info, RDIAR, BIT3 + BIT2 );
5493 usc_OutDmaReg( info, DICR, (u16)(usc_InDmaReg(info,DICR) | BIT1) );
5494 usc_DmaCmd( info, DmaCmd_InitRxChannel );
5495 if ( info->params.flags & HDLC_FLAG_AUTO_DCD )
5496 usc_EnableReceiver(info,ENABLE_AUTO_DCD);
5498 usc_EnableReceiver(info,ENABLE_UNCONDITIONAL);
5502 /* This empties the receive FIFO and loads the RCC with RCLR */
5503 usc_OutReg( info, CCSR, (u16)(usc_InReg(info,CCSR) | BIT13) );
5504 usc_RTCmd( info, RTCmd_PurgeRxFifo );
5507 } /* end of usc_process_rxoverrun_sync() */
5509 /* usc_stop_receiver()
5511 * Disable USC receiver
5513 * Arguments: info pointer to device instance data
5514 * Return Value: None
5516 static void usc_stop_receiver( struct mgsl_struct *info )
5518 if (debug_level >= DEBUG_LEVEL_ISR)
5519 printk("%s(%d):usc_stop_receiver(%s)\n",
5520 __FILE__,__LINE__, info->device_name );
5522 /* Disable receive DMA channel. */
5523 /* This also disables receive DMA channel interrupts */
5524 usc_DmaCmd( info, DmaCmd_ResetRxChannel );
5526 usc_UnlatchRxstatusBits( info, RXSTATUS_ALL );
5527 usc_ClearIrqPendingBits( info, RECEIVE_DATA + RECEIVE_STATUS );
5528 usc_DisableInterrupts( info, RECEIVE_DATA + RECEIVE_STATUS );
5530 usc_EnableReceiver(info,DISABLE_UNCONDITIONAL);
5532 /* This empties the receive FIFO and loads the RCC with RCLR */
5533 usc_OutReg( info, CCSR, (u16)(usc_InReg(info,CCSR) | BIT13) );
5534 usc_RTCmd( info, RTCmd_PurgeRxFifo );
5536 info->rx_enabled = false;
5537 info->rx_overflow = false;
5538 info->rx_rcc_underrun = false;
5540 } /* end of stop_receiver() */
5542 /* usc_start_receiver()
5544 * Enable the USC receiver
5546 * Arguments: info pointer to device instance data
5547 * Return Value: None
5549 static void usc_start_receiver( struct mgsl_struct *info )
5553 if (debug_level >= DEBUG_LEVEL_ISR)
5554 printk("%s(%d):usc_start_receiver(%s)\n",
5555 __FILE__,__LINE__, info->device_name );
5557 mgsl_reset_rx_dma_buffers( info );
5558 usc_stop_receiver( info );
5560 usc_OutReg( info, CCSR, (u16)(usc_InReg(info,CCSR) | BIT13) );
5561 usc_RTCmd( info, RTCmd_PurgeRxFifo );
5563 if ( info->params.mode == MGSL_MODE_HDLC ||
5564 info->params.mode == MGSL_MODE_RAW ) {
5565 /* DMA mode Transfers */
5566 /* Program the DMA controller. */
5567 /* Enable the DMA controller end of buffer interrupt. */
5569 /* program 16C32 with physical address of 1st DMA buffer entry */
5570 phys_addr = info->rx_buffer_list[0].phys_entry;
5571 usc_OutDmaReg( info, NRARL, (u16)phys_addr );
5572 usc_OutDmaReg( info, NRARU, (u16)(phys_addr >> 16) );
5574 usc_UnlatchRxstatusBits( info, RXSTATUS_ALL );
5575 usc_ClearIrqPendingBits( info, RECEIVE_DATA + RECEIVE_STATUS );
5576 usc_EnableInterrupts( info, RECEIVE_STATUS );
5578 /* 1. Arm End of Buffer (EOB) Receive DMA Interrupt (BIT2 of RDIAR) */
5579 /* 2. Enable Receive DMA Interrupts (BIT1 of DICR) */
5581 usc_OutDmaReg( info, RDIAR, BIT3 + BIT2 );
5582 usc_OutDmaReg( info, DICR, (u16)(usc_InDmaReg(info,DICR) | BIT1) );
5583 usc_DmaCmd( info, DmaCmd_InitRxChannel );
5584 if ( info->params.flags & HDLC_FLAG_AUTO_DCD )
5585 usc_EnableReceiver(info,ENABLE_AUTO_DCD);
5587 usc_EnableReceiver(info,ENABLE_UNCONDITIONAL);
5589 usc_UnlatchRxstatusBits(info, RXSTATUS_ALL);
5590 usc_ClearIrqPendingBits(info, RECEIVE_DATA + RECEIVE_STATUS);
5591 usc_EnableInterrupts(info, RECEIVE_DATA);
5593 usc_RTCmd( info, RTCmd_PurgeRxFifo );
5594 usc_RCmd( info, RCmd_EnterHuntmode );
5596 usc_EnableReceiver(info,ENABLE_UNCONDITIONAL);
5599 usc_OutReg( info, CCSR, 0x1020 );
5601 info->rx_enabled = true;
5603 } /* end of usc_start_receiver() */
5605 /* usc_start_transmitter()
5607 * Enable the USC transmitter and send a transmit frame if
5608 * one is loaded in the DMA buffers.
5610 * Arguments: info pointer to device instance data
5611 * Return Value: None
5613 static void usc_start_transmitter( struct mgsl_struct *info )
5616 unsigned int FrameSize;
5618 if (debug_level >= DEBUG_LEVEL_ISR)
5619 printk("%s(%d):usc_start_transmitter(%s)\n",
5620 __FILE__,__LINE__, info->device_name );
5622 if ( info->xmit_cnt ) {
5624 /* If auto RTS enabled and RTS is inactive, then assert */
5625 /* RTS and set a flag indicating that the driver should */
5626 /* negate RTS when the transmission completes. */
5628 info->drop_rts_on_tx_done = false;
5630 if ( info->params.flags & HDLC_FLAG_AUTO_RTS ) {
5631 usc_get_serial_signals( info );
5632 if ( !(info->serial_signals & SerialSignal_RTS) ) {
5633 info->serial_signals |= SerialSignal_RTS;
5634 usc_set_serial_signals( info );
5635 info->drop_rts_on_tx_done = true;
5640 if ( info->params.mode == MGSL_MODE_ASYNC ) {
5641 if ( !info->tx_active ) {
5642 usc_UnlatchTxstatusBits(info, TXSTATUS_ALL);
5643 usc_ClearIrqPendingBits(info, TRANSMIT_STATUS + TRANSMIT_DATA);
5644 usc_EnableInterrupts(info, TRANSMIT_DATA);
5645 usc_load_txfifo(info);
5648 /* Disable transmit DMA controller while programming. */
5649 usc_DmaCmd( info, DmaCmd_ResetTxChannel );
5651 /* Transmit DMA buffer is loaded, so program USC */
5652 /* to send the frame contained in the buffers. */
5654 FrameSize = info->tx_buffer_list[info->start_tx_dma_buffer].rcc;
5656 /* if operating in Raw sync mode, reset the rcc component
5657 * of the tx dma buffer entry, otherwise, the serial controller
5658 * will send a closing sync char after this count.
5660 if ( info->params.mode == MGSL_MODE_RAW )
5661 info->tx_buffer_list[info->start_tx_dma_buffer].rcc = 0;
5663 /* Program the Transmit Character Length Register (TCLR) */
5664 /* and clear FIFO (TCC is loaded with TCLR on FIFO clear) */
5665 usc_OutReg( info, TCLR, (u16)FrameSize );
5667 usc_RTCmd( info, RTCmd_PurgeTxFifo );
5669 /* Program the address of the 1st DMA Buffer Entry in linked list */
5670 phys_addr = info->tx_buffer_list[info->start_tx_dma_buffer].phys_entry;
5671 usc_OutDmaReg( info, NTARL, (u16)phys_addr );
5672 usc_OutDmaReg( info, NTARU, (u16)(phys_addr >> 16) );
5674 usc_UnlatchTxstatusBits( info, TXSTATUS_ALL );
5675 usc_ClearIrqPendingBits( info, TRANSMIT_STATUS );
5676 usc_EnableInterrupts( info, TRANSMIT_STATUS );
5678 if ( info->params.mode == MGSL_MODE_RAW &&
5679 info->num_tx_dma_buffers > 1 ) {
5680 /* When running external sync mode, attempt to 'stream' transmit */
5681 /* by filling tx dma buffers as they become available. To do this */
5682 /* we need to enable Tx DMA EOB Status interrupts : */
5684 /* 1. Arm End of Buffer (EOB) Transmit DMA Interrupt (BIT2 of TDIAR) */
5685 /* 2. Enable Transmit DMA Interrupts (BIT0 of DICR) */
5687 usc_OutDmaReg( info, TDIAR, BIT2|BIT3 );
5688 usc_OutDmaReg( info, DICR, (u16)(usc_InDmaReg(info,DICR) | BIT0) );
5691 /* Initialize Transmit DMA Channel */
5692 usc_DmaCmd( info, DmaCmd_InitTxChannel );
5694 usc_TCmd( info, TCmd_SendFrame );
5696 mod_timer(&info->tx_timer, jiffies +
5697 msecs_to_jiffies(5000));
5699 info->tx_active = true;
5702 if ( !info->tx_enabled ) {
5703 info->tx_enabled = true;
5704 if ( info->params.flags & HDLC_FLAG_AUTO_CTS )
5705 usc_EnableTransmitter(info,ENABLE_AUTO_CTS);
5707 usc_EnableTransmitter(info,ENABLE_UNCONDITIONAL);
5710 } /* end of usc_start_transmitter() */
5712 /* usc_stop_transmitter()
5714 * Stops the transmitter and DMA
5716 * Arguments: info pointer to device isntance data
5717 * Return Value: None
5719 static void usc_stop_transmitter( struct mgsl_struct *info )
5721 if (debug_level >= DEBUG_LEVEL_ISR)
5722 printk("%s(%d):usc_stop_transmitter(%s)\n",
5723 __FILE__,__LINE__, info->device_name );
5725 del_timer(&info->tx_timer);
5727 usc_UnlatchTxstatusBits( info, TXSTATUS_ALL );
5728 usc_ClearIrqPendingBits( info, TRANSMIT_STATUS + TRANSMIT_DATA );
5729 usc_DisableInterrupts( info, TRANSMIT_STATUS + TRANSMIT_DATA );
5731 usc_EnableTransmitter(info,DISABLE_UNCONDITIONAL);
5732 usc_DmaCmd( info, DmaCmd_ResetTxChannel );
5733 usc_RTCmd( info, RTCmd_PurgeTxFifo );
5735 info->tx_enabled = false;
5736 info->tx_active = false;
5738 } /* end of usc_stop_transmitter() */
5740 /* usc_load_txfifo()
5742 * Fill the transmit FIFO until the FIFO is full or
5743 * there is no more data to load.
5745 * Arguments: info pointer to device extension (instance data)
5746 * Return Value: None
5748 static void usc_load_txfifo( struct mgsl_struct *info )
5753 if ( !info->xmit_cnt && !info->x_char )
5756 /* Select transmit FIFO status readback in TICR */
5757 usc_TCmd( info, TCmd_SelectTicrTxFifostatus );
5759 /* load the Transmit FIFO until FIFOs full or all data sent */
5761 while( (Fifocount = usc_InReg(info, TICR) >> 8) && info->xmit_cnt ) {
5762 /* there is more space in the transmit FIFO and */
5763 /* there is more data in transmit buffer */
5765 if ( (info->xmit_cnt > 1) && (Fifocount > 1) && !info->x_char ) {
5766 /* write a 16-bit word from transmit buffer to 16C32 */
5768 TwoBytes[0] = info->xmit_buf[info->xmit_tail++];
5769 info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
5770 TwoBytes[1] = info->xmit_buf[info->xmit_tail++];
5771 info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
5773 outw( *((u16 *)TwoBytes), info->io_base + DATAREG);
5775 info->xmit_cnt -= 2;
5776 info->icount.tx += 2;
5778 /* only 1 byte left to transmit or 1 FIFO slot left */
5780 outw( (inw( info->io_base + CCAR) & 0x0780) | (TDR+LSBONLY),
5781 info->io_base + CCAR );
5784 /* transmit pending high priority char */
5785 outw( info->x_char,info->io_base + CCAR );
5788 outw( info->xmit_buf[info->xmit_tail++],info->io_base + CCAR );
5789 info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
5796 } /* end of usc_load_txfifo() */
5800 * Reset the adapter to a known state and prepare it for further use.
5802 * Arguments: info pointer to device instance data
5803 * Return Value: None
5805 static void usc_reset( struct mgsl_struct *info )
5807 if ( info->bus_type == MGSL_BUS_TYPE_PCI ) {
5811 /* Set BIT30 of Misc Control Register */
5812 /* (Local Control Register 0x50) to force reset of USC. */
5814 volatile u32 *MiscCtrl = (u32 *)(info->lcr_base + 0x50);
5815 u32 *LCR0BRDR = (u32 *)(info->lcr_base + 0x28);
5817 info->misc_ctrl_value |= BIT30;
5818 *MiscCtrl = info->misc_ctrl_value;
5821 * Force at least 170ns delay before clearing
5822 * reset bit. Each read from LCR takes at least
5823 * 30ns so 10 times for 300ns to be safe.
5826 readval = *MiscCtrl;
5828 info->misc_ctrl_value &= ~BIT30;
5829 *MiscCtrl = info->misc_ctrl_value;
5831 *LCR0BRDR = BUS_DESCRIPTOR(
5832 1, // Write Strobe Hold (0-3)
5833 2, // Write Strobe Delay (0-3)
5834 2, // Read Strobe Delay (0-3)
5835 0, // NWDD (Write data-data) (0-3)
5836 4, // NWAD (Write Addr-data) (0-31)
5837 0, // NXDA (Read/Write Data-Addr) (0-3)
5838 0, // NRDD (Read Data-Data) (0-3)
5839 5 // NRAD (Read Addr-Data) (0-31)
5843 outb( 0,info->io_base + 8 );
5847 info->loopback_bits = 0;
5848 info->usc_idle_mode = 0;
5851 * Program the Bus Configuration Register (BCR)
5853 * <15> 0 Don't use separate address
5854 * <14..6> 0 reserved
5855 * <5..4> 00 IAckmode = Default, don't care
5856 * <3> 1 Bus Request Totem Pole output
5857 * <2> 1 Use 16 Bit data bus
5858 * <1> 0 IRQ Totem Pole output
5859 * <0> 0 Don't Shift Right Addr
5861 * 0000 0000 0000 1100 = 0x000c
5863 * By writing to io_base + SDPIN the Wait/Ack pin is
5864 * programmed to work as a Wait pin.
5867 outw( 0x000c,info->io_base + SDPIN );
5870 outw( 0,info->io_base );
5871 outw( 0,info->io_base + CCAR );
5873 /* select little endian byte ordering */
5874 usc_RTCmd( info, RTCmd_SelectLittleEndian );
5877 /* Port Control Register (PCR)
5879 * <15..14> 11 Port 7 is Output (~DMAEN, Bit 14 : 0 = Enabled)
5880 * <13..12> 11 Port 6 is Output (~INTEN, Bit 12 : 0 = Enabled)
5881 * <11..10> 00 Port 5 is Input (No Connect, Don't Care)
5882 * <9..8> 00 Port 4 is Input (No Connect, Don't Care)
5883 * <7..6> 11 Port 3 is Output (~RTS, Bit 6 : 0 = Enabled )
5884 * <5..4> 11 Port 2 is Output (~DTR, Bit 4 : 0 = Enabled )
5885 * <3..2> 01 Port 1 is Input (Dedicated RxC)
5886 * <1..0> 01 Port 0 is Input (Dedicated TxC)
5888 * 1111 0000 1111 0101 = 0xf0f5
5891 usc_OutReg( info, PCR, 0xf0f5 );
5895 * Input/Output Control Register
5897 * <15..14> 00 CTS is active low input
5898 * <13..12> 00 DCD is active low input
5899 * <11..10> 00 TxREQ pin is input (DSR)
5900 * <9..8> 00 RxREQ pin is input (RI)
5901 * <7..6> 00 TxD is output (Transmit Data)
5902 * <5..3> 000 TxC Pin in Input (14.7456MHz Clock)
5903 * <2..0> 100 RxC is Output (drive with BRG0)
5905 * 0000 0000 0000 0100 = 0x0004
5908 usc_OutReg( info, IOCR, 0x0004 );
5910 } /* end of usc_reset() */
5912 /* usc_set_async_mode()
5914 * Program adapter for asynchronous communications.
5916 * Arguments: info pointer to device instance data
5917 * Return Value: None
5919 static void usc_set_async_mode( struct mgsl_struct *info )
5923 /* disable interrupts while programming USC */
5924 usc_DisableMasterIrqBit( info );
5926 outw( 0, info->io_base ); /* clear Master Bus Enable (DCAR) */
5927 usc_DmaCmd( info, DmaCmd_ResetAllChannels ); /* disable both DMA channels */
5929 usc_loopback_frame( info );
5931 /* Channel mode Register (CMR)
5933 * <15..14> 00 Tx Sub modes, 00 = 1 Stop Bit
5934 * <13..12> 00 00 = 16X Clock
5935 * <11..8> 0000 Transmitter mode = Asynchronous
5936 * <7..6> 00 reserved?
5937 * <5..4> 00 Rx Sub modes, 00 = 16X Clock
5938 * <3..0> 0000 Receiver mode = Asynchronous
5940 * 0000 0000 0000 0000 = 0x0
5944 if ( info->params.stop_bits != 1 )
5946 usc_OutReg( info, CMR, RegValue );
5949 /* Receiver mode Register (RMR)
5951 * <15..13> 000 encoding = None
5952 * <12..08> 00000 reserved (Sync Only)
5953 * <7..6> 00 Even parity
5954 * <5> 0 parity disabled
5955 * <4..2> 000 Receive Char Length = 8 bits
5956 * <1..0> 00 Disable Receiver
5958 * 0000 0000 0000 0000 = 0x0
5963 if ( info->params.data_bits != 8 )
5964 RegValue |= BIT4+BIT3+BIT2;
5966 if ( info->params.parity != ASYNC_PARITY_NONE ) {
5968 if ( info->params.parity != ASYNC_PARITY_ODD )
5972 usc_OutReg( info, RMR, RegValue );
5975 /* Set IRQ trigger level */
5977 usc_RCmd( info, RCmd_SelectRicrIntLevel );
5980 /* Receive Interrupt Control Register (RICR)
5982 * <15..8> ? RxFIFO IRQ Request Level
5984 * Note: For async mode the receive FIFO level must be set
5985 * to 0 to avoid the situation where the FIFO contains fewer bytes
5986 * than the trigger level and no more data is expected.
5988 * <7> 0 Exited Hunt IA (Interrupt Arm)
5989 * <6> 0 Idle Received IA
5990 * <5> 0 Break/Abort IA
5992 * <3> 0 Queued status reflects oldest byte in FIFO
5994 * <1> 0 Rx Overrun IA
5995 * <0> 0 Select TC0 value for readback
5997 * 0000 0000 0100 0000 = 0x0000 + (FIFOLEVEL in MSB)
6000 usc_OutReg( info, RICR, 0x0000 );
6002 usc_UnlatchRxstatusBits( info, RXSTATUS_ALL );
6003 usc_ClearIrqPendingBits( info, RECEIVE_STATUS );
6006 /* Transmit mode Register (TMR)
6008 * <15..13> 000 encoding = None
6009 * <12..08> 00000 reserved (Sync Only)
6010 * <7..6> 00 Transmit parity Even
6011 * <5> 0 Transmit parity Disabled
6012 * <4..2> 000 Tx Char Length = 8 bits
6013 * <1..0> 00 Disable Transmitter
6015 * 0000 0000 0000 0000 = 0x0
6020 if ( info->params.data_bits != 8 )
6021 RegValue |= BIT4+BIT3+BIT2;
6023 if ( info->params.parity != ASYNC_PARITY_NONE ) {
6025 if ( info->params.parity != ASYNC_PARITY_ODD )
6029 usc_OutReg( info, TMR, RegValue );
6031 usc_set_txidle( info );
6034 /* Set IRQ trigger level */
6036 usc_TCmd( info, TCmd_SelectTicrIntLevel );
6039 /* Transmit Interrupt Control Register (TICR)
6041 * <15..8> ? Transmit FIFO IRQ Level
6042 * <7> 0 Present IA (Interrupt Arm)
6043 * <6> 1 Idle Sent IA
6044 * <5> 0 Abort Sent IA
6045 * <4> 0 EOF/EOM Sent IA
6047 * <2> 0 1 = Wait for SW Trigger to Start Frame
6048 * <1> 0 Tx Underrun IA
6049 * <0> 0 TC0 constant on read back
6051 * 0000 0000 0100 0000 = 0x0040
6054 usc_OutReg( info, TICR, 0x1f40 );
6056 usc_UnlatchTxstatusBits( info, TXSTATUS_ALL );
6057 usc_ClearIrqPendingBits( info, TRANSMIT_STATUS );
6059 usc_enable_async_clock( info, info->params.data_rate );
6062 /* Channel Control/status Register (CCSR)
6064 * <15> X RCC FIFO Overflow status (RO)
6065 * <14> X RCC FIFO Not Empty status (RO)
6066 * <13> 0 1 = Clear RCC FIFO (WO)
6067 * <12> X DPLL in Sync status (RO)
6068 * <11> X DPLL 2 Missed Clocks status (RO)
6069 * <10> X DPLL 1 Missed Clock status (RO)
6070 * <9..8> 00 DPLL Resync on rising and falling edges (RW)
6071 * <7> X SDLC Loop On status (RO)
6072 * <6> X SDLC Loop Send status (RO)
6073 * <5> 1 Bypass counters for TxClk and RxClk (RW)
6074 * <4..2> 000 Last Char of SDLC frame has 8 bits (RW)
6075 * <1..0> 00 reserved
6077 * 0000 0000 0010 0000 = 0x0020
6080 usc_OutReg( info, CCSR, 0x0020 );
6082 usc_DisableInterrupts( info, TRANSMIT_STATUS + TRANSMIT_DATA +
6083 RECEIVE_DATA + RECEIVE_STATUS );
6085 usc_ClearIrqPendingBits( info, TRANSMIT_STATUS + TRANSMIT_DATA +
6086 RECEIVE_DATA + RECEIVE_STATUS );
6088 usc_EnableMasterIrqBit( info );
6090 if (info->bus_type == MGSL_BUS_TYPE_ISA) {
6091 /* Enable INTEN (Port 6, Bit12) */
6092 /* This connects the IRQ request signal to the ISA bus */
6093 usc_OutReg(info, PCR, (u16)((usc_InReg(info, PCR) | BIT13) & ~BIT12));
6096 if (info->params.loopback) {
6097 info->loopback_bits = 0x300;
6098 outw(0x0300, info->io_base + CCAR);
6101 } /* end of usc_set_async_mode() */
6103 /* usc_loopback_frame()
6105 * Loop back a small (2 byte) dummy SDLC frame.
6106 * Interrupts and DMA are NOT used. The purpose of this is to
6107 * clear any 'stale' status info left over from running in async mode.
6109 * The 16C32 shows the strange behaviour of marking the 1st
6110 * received SDLC frame with a CRC error even when there is no
6111 * CRC error. To get around this a small dummy from of 2 bytes
6112 * is looped back when switching from async to sync mode.
6114 * Arguments: info pointer to device instance data
6115 * Return Value: None
6117 static void usc_loopback_frame( struct mgsl_struct *info )
6120 unsigned long oldmode = info->params.mode;
6122 info->params.mode = MGSL_MODE_HDLC;
6124 usc_DisableMasterIrqBit( info );
6126 usc_set_sdlc_mode( info );
6127 usc_enable_loopback( info, 1 );
6129 /* Write 16-bit Time Constant for BRG0 */
6130 usc_OutReg( info, TC0R, 0 );
6132 /* Channel Control Register (CCR)
6134 * <15..14> 00 Don't use 32-bit Tx Control Blocks (TCBs)
6135 * <13> 0 Trigger Tx on SW Command Disabled
6136 * <12> 0 Flag Preamble Disabled
6137 * <11..10> 00 Preamble Length = 8-Bits
6138 * <9..8> 01 Preamble Pattern = flags
6139 * <7..6> 10 Don't use 32-bit Rx status Blocks (RSBs)
6140 * <5> 0 Trigger Rx on SW Command Disabled
6143 * 0000 0001 0000 0000 = 0x0100
6146 usc_OutReg( info, CCR, 0x0100 );
6148 /* SETUP RECEIVER */
6149 usc_RTCmd( info, RTCmd_PurgeRxFifo );
6150 usc_EnableReceiver(info,ENABLE_UNCONDITIONAL);
6152 /* SETUP TRANSMITTER */
6153 /* Program the Transmit Character Length Register (TCLR) */
6154 /* and clear FIFO (TCC is loaded with TCLR on FIFO clear) */
6155 usc_OutReg( info, TCLR, 2 );
6156 usc_RTCmd( info, RTCmd_PurgeTxFifo );
6158 /* unlatch Tx status bits, and start transmit channel. */
6159 usc_UnlatchTxstatusBits(info,TXSTATUS_ALL);
6160 outw(0,info->io_base + DATAREG);
6162 /* ENABLE TRANSMITTER */
6163 usc_TCmd( info, TCmd_SendFrame );
6164 usc_EnableTransmitter(info,ENABLE_UNCONDITIONAL);
6166 /* WAIT FOR RECEIVE COMPLETE */
6167 for (i=0 ; i<1000 ; i++)
6168 if (usc_InReg( info, RCSR ) & (BIT8 + BIT4 + BIT3 + BIT1))
6171 /* clear Internal Data loopback mode */
6172 usc_enable_loopback(info, 0);
6174 usc_EnableMasterIrqBit(info);
6176 info->params.mode = oldmode;
6178 } /* end of usc_loopback_frame() */
6180 /* usc_set_sync_mode() Programs the USC for SDLC communications.
6182 * Arguments: info pointer to adapter info structure
6183 * Return Value: None
6185 static void usc_set_sync_mode( struct mgsl_struct *info )
6187 usc_loopback_frame( info );
6188 usc_set_sdlc_mode( info );
6190 if (info->bus_type == MGSL_BUS_TYPE_ISA) {
6191 /* Enable INTEN (Port 6, Bit12) */
6192 /* This connects the IRQ request signal to the ISA bus */
6193 usc_OutReg(info, PCR, (u16)((usc_InReg(info, PCR) | BIT13) & ~BIT12));
6196 usc_enable_aux_clock(info, info->params.clock_speed);
6198 if (info->params.loopback)
6199 usc_enable_loopback(info,1);
6201 } /* end of mgsl_set_sync_mode() */
6203 /* usc_set_txidle() Set the HDLC idle mode for the transmitter.
6205 * Arguments: info pointer to device instance data
6206 * Return Value: None
6208 static void usc_set_txidle( struct mgsl_struct *info )
6210 u16 usc_idle_mode = IDLEMODE_FLAGS;
6212 /* Map API idle mode to USC register bits */
6214 switch( info->idle_mode ){
6215 case HDLC_TXIDLE_FLAGS: usc_idle_mode = IDLEMODE_FLAGS; break;
6216 case HDLC_TXIDLE_ALT_ZEROS_ONES: usc_idle_mode = IDLEMODE_ALT_ONE_ZERO; break;
6217 case HDLC_TXIDLE_ZEROS: usc_idle_mode = IDLEMODE_ZERO; break;
6218 case HDLC_TXIDLE_ONES: usc_idle_mode = IDLEMODE_ONE; break;
6219 case HDLC_TXIDLE_ALT_MARK_SPACE: usc_idle_mode = IDLEMODE_ALT_MARK_SPACE; break;
6220 case HDLC_TXIDLE_SPACE: usc_idle_mode = IDLEMODE_SPACE; break;
6221 case HDLC_TXIDLE_MARK: usc_idle_mode = IDLEMODE_MARK; break;
6224 info->usc_idle_mode = usc_idle_mode;
6225 //usc_OutReg(info, TCSR, usc_idle_mode);
6226 info->tcsr_value &= ~IDLEMODE_MASK; /* clear idle mode bits */
6227 info->tcsr_value += usc_idle_mode;
6228 usc_OutReg(info, TCSR, info->tcsr_value);
6231 * if SyncLink WAN adapter is running in external sync mode, the
6232 * transmitter has been set to Monosync in order to try to mimic
6233 * a true raw outbound bit stream. Monosync still sends an open/close
6234 * sync char at the start/end of a frame. Try to match those sync
6235 * patterns to the idle mode set here
6237 if ( info->params.mode == MGSL_MODE_RAW ) {
6238 unsigned char syncpat = 0;
6239 switch( info->idle_mode ) {
6240 case HDLC_TXIDLE_FLAGS:
6243 case HDLC_TXIDLE_ALT_ZEROS_ONES:
6246 case HDLC_TXIDLE_ZEROS:
6247 case HDLC_TXIDLE_SPACE:
6250 case HDLC_TXIDLE_ONES:
6251 case HDLC_TXIDLE_MARK:
6254 case HDLC_TXIDLE_ALT_MARK_SPACE:
6259 usc_SetTransmitSyncChars(info,syncpat,syncpat);
6262 } /* end of usc_set_txidle() */
6264 /* usc_get_serial_signals()
6266 * Query the adapter for the state of the V24 status (input) signals.
6268 * Arguments: info pointer to device instance data
6269 * Return Value: None
6271 static void usc_get_serial_signals( struct mgsl_struct *info )
6275 /* clear all serial signals except DTR and RTS */
6276 info->serial_signals &= SerialSignal_DTR + SerialSignal_RTS;
6278 /* Read the Misc Interrupt status Register (MISR) to get */
6279 /* the V24 status signals. */
6281 status = usc_InReg( info, MISR );
6283 /* set serial signal bits to reflect MISR */
6285 if ( status & MISCSTATUS_CTS )
6286 info->serial_signals |= SerialSignal_CTS;
6288 if ( status & MISCSTATUS_DCD )
6289 info->serial_signals |= SerialSignal_DCD;
6291 if ( status & MISCSTATUS_RI )
6292 info->serial_signals |= SerialSignal_RI;
6294 if ( status & MISCSTATUS_DSR )
6295 info->serial_signals |= SerialSignal_DSR;
6297 } /* end of usc_get_serial_signals() */
6299 /* usc_set_serial_signals()
6301 * Set the state of DTR and RTS based on contents of
6302 * serial_signals member of device extension.
6304 * Arguments: info pointer to device instance data
6305 * Return Value: None
6307 static void usc_set_serial_signals( struct mgsl_struct *info )
6310 unsigned char V24Out = info->serial_signals;
6312 /* get the current value of the Port Control Register (PCR) */
6314 Control = usc_InReg( info, PCR );
6316 if ( V24Out & SerialSignal_RTS )
6321 if ( V24Out & SerialSignal_DTR )
6326 usc_OutReg( info, PCR, Control );
6328 } /* end of usc_set_serial_signals() */
6330 /* usc_enable_async_clock()
6332 * Enable the async clock at the specified frequency.
6334 * Arguments: info pointer to device instance data
6335 * data_rate data rate of clock in bps
6336 * 0 disables the AUX clock.
6337 * Return Value: None
6339 static void usc_enable_async_clock( struct mgsl_struct *info, u32 data_rate )
6343 * Clock mode Control Register (CMCR)
6345 * <15..14> 00 counter 1 Disabled
6346 * <13..12> 00 counter 0 Disabled
6347 * <11..10> 11 BRG1 Input is TxC Pin
6348 * <9..8> 11 BRG0 Input is TxC Pin
6349 * <7..6> 01 DPLL Input is BRG1 Output
6350 * <5..3> 100 TxCLK comes from BRG0
6351 * <2..0> 100 RxCLK comes from BRG0
6353 * 0000 1111 0110 0100 = 0x0f64
6356 usc_OutReg( info, CMCR, 0x0f64 );
6360 * Write 16-bit Time Constant for BRG0
6361 * Time Constant = (ClkSpeed / data_rate) - 1
6362 * ClkSpeed = 921600 (ISA), 691200 (PCI)
6365 if ( info->bus_type == MGSL_BUS_TYPE_PCI )
6366 usc_OutReg( info, TC0R, (u16)((691200/data_rate) - 1) );
6368 usc_OutReg( info, TC0R, (u16)((921600/data_rate) - 1) );
6372 * Hardware Configuration Register (HCR)
6373 * Clear Bit 1, BRG0 mode = Continuous
6374 * Set Bit 0 to enable BRG0.
6377 usc_OutReg( info, HCR,
6378 (u16)((usc_InReg( info, HCR ) & ~BIT1) | BIT0) );
6381 /* Input/Output Control Reg, <2..0> = 100, Drive RxC pin with BRG0 */
6383 usc_OutReg( info, IOCR,
6384 (u16)((usc_InReg(info, IOCR) & 0xfff8) | 0x0004) );
6386 /* data rate == 0 so turn off BRG0 */
6387 usc_OutReg( info, HCR, (u16)(usc_InReg( info, HCR ) & ~BIT0) );
6390 } /* end of usc_enable_async_clock() */
6393 * Buffer Structures:
6395 * Normal memory access uses virtual addresses that can make discontiguous
6396 * physical memory pages appear to be contiguous in the virtual address
6397 * space (the processors memory mapping handles the conversions).
6399 * DMA transfers require physically contiguous memory. This is because
6400 * the DMA system controller and DMA bus masters deal with memory using
6401 * only physical addresses.
6403 * This causes a problem under Windows NT when large DMA buffers are
6404 * needed. Fragmentation of the nonpaged pool prevents allocations of
6405 * physically contiguous buffers larger than the PAGE_SIZE.
6407 * However the 16C32 supports Bus Master Scatter/Gather DMA which
6408 * allows DMA transfers to physically discontiguous buffers. Information
6409 * about each data transfer buffer is contained in a memory structure
6410 * called a 'buffer entry'. A list of buffer entries is maintained
6411 * to track and control the use of the data transfer buffers.
6413 * To support this strategy we will allocate sufficient PAGE_SIZE
6414 * contiguous memory buffers to allow for the total required buffer
6417 * The 16C32 accesses the list of buffer entries using Bus Master
6418 * DMA. Control information is read from the buffer entries by the
6419 * 16C32 to control data transfers. status information is written to
6420 * the buffer entries by the 16C32 to indicate the status of completed
6423 * The CPU writes control information to the buffer entries to control
6424 * the 16C32 and reads status information from the buffer entries to
6425 * determine information about received and transmitted frames.
6427 * Because the CPU and 16C32 (adapter) both need simultaneous access
6428 * to the buffer entries, the buffer entry memory is allocated with
6429 * HalAllocateCommonBuffer(). This restricts the size of the buffer
6430 * entry list to PAGE_SIZE.
6432 * The actual data buffers on the other hand will only be accessed
6433 * by the CPU or the adapter but not by both simultaneously. This allows
6434 * Scatter/Gather packet based DMA procedures for using physically
6435 * discontiguous pages.
6439 * mgsl_reset_tx_dma_buffers()
6441 * Set the count for all transmit buffers to 0 to indicate the
6442 * buffer is available for use and set the current buffer to the
6443 * first buffer. This effectively makes all buffers free and
6444 * discards any data in buffers.
6446 * Arguments: info pointer to device instance data
6447 * Return Value: None
6449 static void mgsl_reset_tx_dma_buffers( struct mgsl_struct *info )
6453 for ( i = 0; i < info->tx_buffer_count; i++ ) {
6454 *((unsigned long *)&(info->tx_buffer_list[i].count)) = 0;
6457 info->current_tx_buffer = 0;
6458 info->start_tx_dma_buffer = 0;
6459 info->tx_dma_buffers_used = 0;
6461 info->get_tx_holding_index = 0;
6462 info->put_tx_holding_index = 0;
6463 info->tx_holding_count = 0;
6465 } /* end of mgsl_reset_tx_dma_buffers() */
6468 * num_free_tx_dma_buffers()
6470 * returns the number of free tx dma buffers available
6472 * Arguments: info pointer to device instance data
6473 * Return Value: number of free tx dma buffers
6475 static int num_free_tx_dma_buffers(struct mgsl_struct *info)
6477 return info->tx_buffer_count - info->tx_dma_buffers_used;
6481 * mgsl_reset_rx_dma_buffers()
6483 * Set the count for all receive buffers to DMABUFFERSIZE
6484 * and set the current buffer to the first buffer. This effectively
6485 * makes all buffers free and discards any data in buffers.
6487 * Arguments: info pointer to device instance data
6488 * Return Value: None
6490 static void mgsl_reset_rx_dma_buffers( struct mgsl_struct *info )
6494 for ( i = 0; i < info->rx_buffer_count; i++ ) {
6495 *((unsigned long *)&(info->rx_buffer_list[i].count)) = DMABUFFERSIZE;
6496 // info->rx_buffer_list[i].count = DMABUFFERSIZE;
6497 // info->rx_buffer_list[i].status = 0;
6500 info->current_rx_buffer = 0;
6502 } /* end of mgsl_reset_rx_dma_buffers() */
6505 * mgsl_free_rx_frame_buffers()
6507 * Free the receive buffers used by a received SDLC
6508 * frame such that the buffers can be reused.
6512 * info pointer to device instance data
6513 * StartIndex index of 1st receive buffer of frame
6514 * EndIndex index of last receive buffer of frame
6516 * Return Value: None
6518 static void mgsl_free_rx_frame_buffers( struct mgsl_struct *info, unsigned int StartIndex, unsigned int EndIndex )
6521 DMABUFFERENTRY *pBufEntry;
6524 /* Starting with 1st buffer entry of the frame clear the status */
6525 /* field and set the count field to DMA Buffer Size. */
6530 pBufEntry = &(info->rx_buffer_list[Index]);
6532 if ( Index == EndIndex ) {
6533 /* This is the last buffer of the frame! */
6537 /* reset current buffer for reuse */
6538 // pBufEntry->status = 0;
6539 // pBufEntry->count = DMABUFFERSIZE;
6540 *((unsigned long *)&(pBufEntry->count)) = DMABUFFERSIZE;
6542 /* advance to next buffer entry in linked list */
6544 if ( Index == info->rx_buffer_count )
6548 /* set current buffer to next buffer after last buffer of frame */
6549 info->current_rx_buffer = Index;
6551 } /* end of free_rx_frame_buffers() */
6553 /* mgsl_get_rx_frame()
6555 * This function attempts to return a received SDLC frame from the
6556 * receive DMA buffers. Only frames received without errors are returned.
6558 * Arguments: info pointer to device extension
6559 * Return Value: true if frame returned, otherwise false
6561 static bool mgsl_get_rx_frame(struct mgsl_struct *info)
6563 unsigned int StartIndex, EndIndex; /* index of 1st and last buffers of Rx frame */
6564 unsigned short status;
6565 DMABUFFERENTRY *pBufEntry;
6566 unsigned int framesize = 0;
6567 bool ReturnCode = false;
6568 unsigned long flags;
6569 struct tty_struct *tty = info->port.tty;
6570 bool return_frame = false;
6573 * current_rx_buffer points to the 1st buffer of the next available
6574 * receive frame. To find the last buffer of the frame look for
6575 * a non-zero status field in the buffer entries. (The status
6576 * field is set by the 16C32 after completing a receive frame.
6579 StartIndex = EndIndex = info->current_rx_buffer;
6581 while( !info->rx_buffer_list[EndIndex].status ) {
6583 * If the count field of the buffer entry is non-zero then
6584 * this buffer has not been used. (The 16C32 clears the count
6585 * field when it starts using the buffer.) If an unused buffer
6586 * is encountered then there are no frames available.
6589 if ( info->rx_buffer_list[EndIndex].count )
6592 /* advance to next buffer entry in linked list */
6594 if ( EndIndex == info->rx_buffer_count )
6597 /* if entire list searched then no frame available */
6598 if ( EndIndex == StartIndex ) {
6599 /* If this occurs then something bad happened,
6600 * all buffers have been 'used' but none mark
6601 * the end of a frame. Reset buffers and receiver.
6604 if ( info->rx_enabled ){
6605 spin_lock_irqsave(&info->irq_spinlock,flags);
6606 usc_start_receiver(info);
6607 spin_unlock_irqrestore(&info->irq_spinlock,flags);
6614 /* check status of receive frame */
6616 status = info->rx_buffer_list[EndIndex].status;
6618 if ( status & (RXSTATUS_SHORT_FRAME + RXSTATUS_OVERRUN +
6619 RXSTATUS_CRC_ERROR + RXSTATUS_ABORT) ) {
6620 if ( status & RXSTATUS_SHORT_FRAME )
6621 info->icount.rxshort++;
6622 else if ( status & RXSTATUS_ABORT )
6623 info->icount.rxabort++;
6624 else if ( status & RXSTATUS_OVERRUN )
6625 info->icount.rxover++;
6627 info->icount.rxcrc++;
6628 if ( info->params.crc_type & HDLC_CRC_RETURN_EX )
6629 return_frame = true;
6632 #if SYNCLINK_GENERIC_HDLC
6634 info->netdev->stats.rx_errors++;
6635 info->netdev->stats.rx_frame_errors++;
6639 return_frame = true;
6641 if ( return_frame ) {
6642 /* receive frame has no errors, get frame size.
6643 * The frame size is the starting value of the RCC (which was
6644 * set to 0xffff) minus the ending value of the RCC (decremented
6645 * once for each receive character) minus 2 for the 16-bit CRC.
6648 framesize = RCLRVALUE - info->rx_buffer_list[EndIndex].rcc;
6650 /* adjust frame size for CRC if any */
6651 if ( info->params.crc_type == HDLC_CRC_16_CCITT )
6653 else if ( info->params.crc_type == HDLC_CRC_32_CCITT )
6657 if ( debug_level >= DEBUG_LEVEL_BH )
6658 printk("%s(%d):mgsl_get_rx_frame(%s) status=%04X size=%d\n",
6659 __FILE__,__LINE__,info->device_name,status,framesize);
6661 if ( debug_level >= DEBUG_LEVEL_DATA )
6662 mgsl_trace_block(info,info->rx_buffer_list[StartIndex].virt_addr,
6663 min_t(int, framesize, DMABUFFERSIZE),0);
6666 if ( ( (info->params.crc_type & HDLC_CRC_RETURN_EX) &&
6667 ((framesize+1) > info->max_frame_size) ) ||
6668 (framesize > info->max_frame_size) )
6669 info->icount.rxlong++;
6671 /* copy dma buffer(s) to contiguous intermediate buffer */
6672 int copy_count = framesize;
6673 int index = StartIndex;
6674 unsigned char *ptmp = info->intermediate_rxbuffer;
6676 if ( !(status & RXSTATUS_CRC_ERROR))
6677 info->icount.rxok++;
6681 if ( copy_count > DMABUFFERSIZE )
6682 partial_count = DMABUFFERSIZE;
6684 partial_count = copy_count;
6686 pBufEntry = &(info->rx_buffer_list[index]);
6687 memcpy( ptmp, pBufEntry->virt_addr, partial_count );
6688 ptmp += partial_count;
6689 copy_count -= partial_count;
6691 if ( ++index == info->rx_buffer_count )
6695 if ( info->params.crc_type & HDLC_CRC_RETURN_EX ) {
6697 *ptmp = (status & RXSTATUS_CRC_ERROR ?
6701 if ( debug_level >= DEBUG_LEVEL_DATA )
6702 printk("%s(%d):mgsl_get_rx_frame(%s) rx frame status=%d\n",
6703 __FILE__,__LINE__,info->device_name,
6707 #if SYNCLINK_GENERIC_HDLC
6709 hdlcdev_rx(info,info->intermediate_rxbuffer,framesize);
6712 ldisc_receive_buf(tty, info->intermediate_rxbuffer, info->flag_buf, framesize);
6715 /* Free the buffers used by this frame. */
6716 mgsl_free_rx_frame_buffers( info, StartIndex, EndIndex );
6722 if ( info->rx_enabled && info->rx_overflow ) {
6723 /* The receiver needs to restarted because of
6724 * a receive overflow (buffer or FIFO). If the
6725 * receive buffers are now empty, then restart receiver.
6728 if ( !info->rx_buffer_list[EndIndex].status &&
6729 info->rx_buffer_list[EndIndex].count ) {
6730 spin_lock_irqsave(&info->irq_spinlock,flags);
6731 usc_start_receiver(info);
6732 spin_unlock_irqrestore(&info->irq_spinlock,flags);
6738 } /* end of mgsl_get_rx_frame() */
6740 /* mgsl_get_raw_rx_frame()
6742 * This function attempts to return a received frame from the
6743 * receive DMA buffers when running in external loop mode. In this mode,
6744 * we will return at most one DMABUFFERSIZE frame to the application.
6745 * The USC receiver is triggering off of DCD going active to start a new
6746 * frame, and DCD going inactive to terminate the frame (similar to
6747 * processing a closing flag character).
6749 * In this routine, we will return DMABUFFERSIZE "chunks" at a time.
6750 * If DCD goes inactive, the last Rx DMA Buffer will have a non-zero
6751 * status field and the RCC field will indicate the length of the
6752 * entire received frame. We take this RCC field and get the modulus
6753 * of RCC and DMABUFFERSIZE to determine if number of bytes in the
6754 * last Rx DMA buffer and return that last portion of the frame.
6756 * Arguments: info pointer to device extension
6757 * Return Value: true if frame returned, otherwise false
6759 static bool mgsl_get_raw_rx_frame(struct mgsl_struct *info)
6761 unsigned int CurrentIndex, NextIndex;
6762 unsigned short status;
6763 DMABUFFERENTRY *pBufEntry;
6764 unsigned int framesize = 0;
6765 bool ReturnCode = false;
6766 unsigned long flags;
6767 struct tty_struct *tty = info->port.tty;
6770 * current_rx_buffer points to the 1st buffer of the next available
6771 * receive frame. The status field is set by the 16C32 after
6772 * completing a receive frame. If the status field of this buffer
6773 * is zero, either the USC is still filling this buffer or this
6774 * is one of a series of buffers making up a received frame.
6776 * If the count field of this buffer is zero, the USC is either
6777 * using this buffer or has used this buffer. Look at the count
6778 * field of the next buffer. If that next buffer's count is
6779 * non-zero, the USC is still actively using the current buffer.
6780 * Otherwise, if the next buffer's count field is zero, the
6781 * current buffer is complete and the USC is using the next
6784 CurrentIndex = NextIndex = info->current_rx_buffer;
6786 if ( NextIndex == info->rx_buffer_count )
6789 if ( info->rx_buffer_list[CurrentIndex].status != 0 ||
6790 (info->rx_buffer_list[CurrentIndex].count == 0 &&
6791 info->rx_buffer_list[NextIndex].count == 0)) {
6793 * Either the status field of this dma buffer is non-zero
6794 * (indicating the last buffer of a receive frame) or the next
6795 * buffer is marked as in use -- implying this buffer is complete
6796 * and an intermediate buffer for this received frame.
6799 status = info->rx_buffer_list[CurrentIndex].status;
6801 if ( status & (RXSTATUS_SHORT_FRAME + RXSTATUS_OVERRUN +
6802 RXSTATUS_CRC_ERROR + RXSTATUS_ABORT) ) {
6803 if ( status & RXSTATUS_SHORT_FRAME )
6804 info->icount.rxshort++;
6805 else if ( status & RXSTATUS_ABORT )
6806 info->icount.rxabort++;
6807 else if ( status & RXSTATUS_OVERRUN )
6808 info->icount.rxover++;
6810 info->icount.rxcrc++;
6814 * A receive frame is available, get frame size and status.
6816 * The frame size is the starting value of the RCC (which was
6817 * set to 0xffff) minus the ending value of the RCC (decremented
6818 * once for each receive character) minus 2 or 4 for the 16-bit
6821 * If the status field is zero, this is an intermediate buffer.
6824 * If the DMA Buffer Entry's Status field is non-zero, the
6825 * receive operation completed normally (ie: DCD dropped). The
6826 * RCC field is valid and holds the received frame size.
6827 * It is possible that the RCC field will be zero on a DMA buffer
6828 * entry with a non-zero status. This can occur if the total
6829 * frame size (number of bytes between the time DCD goes active
6830 * to the time DCD goes inactive) exceeds 65535 bytes. In this
6831 * case the 16C32 has underrun on the RCC count and appears to
6832 * stop updating this counter to let us know the actual received
6833 * frame size. If this happens (non-zero status and zero RCC),
6834 * simply return the entire RxDMA Buffer
6838 * In the event that the final RxDMA Buffer is
6839 * terminated with a non-zero status and the RCC
6840 * field is zero, we interpret this as the RCC
6841 * having underflowed (received frame > 65535 bytes).
6843 * Signal the event to the user by passing back
6844 * a status of RxStatus_CrcError returning the full
6845 * buffer and let the app figure out what data is
6848 if ( info->rx_buffer_list[CurrentIndex].rcc )
6849 framesize = RCLRVALUE - info->rx_buffer_list[CurrentIndex].rcc;
6851 framesize = DMABUFFERSIZE;
6854 framesize = DMABUFFERSIZE;
6857 if ( framesize > DMABUFFERSIZE ) {
6859 * if running in raw sync mode, ISR handler for
6860 * End Of Buffer events terminates all buffers at 4K.
6861 * If this frame size is said to be >4K, get the
6862 * actual number of bytes of the frame in this buffer.
6864 framesize = framesize % DMABUFFERSIZE;
6868 if ( debug_level >= DEBUG_LEVEL_BH )
6869 printk("%s(%d):mgsl_get_raw_rx_frame(%s) status=%04X size=%d\n",
6870 __FILE__,__LINE__,info->device_name,status,framesize);
6872 if ( debug_level >= DEBUG_LEVEL_DATA )
6873 mgsl_trace_block(info,info->rx_buffer_list[CurrentIndex].virt_addr,
6874 min_t(int, framesize, DMABUFFERSIZE),0);
6877 /* copy dma buffer(s) to contiguous intermediate buffer */
6878 /* NOTE: we never copy more than DMABUFFERSIZE bytes */
6880 pBufEntry = &(info->rx_buffer_list[CurrentIndex]);
6881 memcpy( info->intermediate_rxbuffer, pBufEntry->virt_addr, framesize);
6882 info->icount.rxok++;
6884 ldisc_receive_buf(tty, info->intermediate_rxbuffer, info->flag_buf, framesize);
6887 /* Free the buffers used by this frame. */
6888 mgsl_free_rx_frame_buffers( info, CurrentIndex, CurrentIndex );
6894 if ( info->rx_enabled && info->rx_overflow ) {
6895 /* The receiver needs to restarted because of
6896 * a receive overflow (buffer or FIFO). If the
6897 * receive buffers are now empty, then restart receiver.
6900 if ( !info->rx_buffer_list[CurrentIndex].status &&
6901 info->rx_buffer_list[CurrentIndex].count ) {
6902 spin_lock_irqsave(&info->irq_spinlock,flags);
6903 usc_start_receiver(info);
6904 spin_unlock_irqrestore(&info->irq_spinlock,flags);
6910 } /* end of mgsl_get_raw_rx_frame() */
6912 /* mgsl_load_tx_dma_buffer()
6914 * Load the transmit DMA buffer with the specified data.
6918 * info pointer to device extension
6919 * Buffer pointer to buffer containing frame to load
6920 * BufferSize size in bytes of frame in Buffer
6922 * Return Value: None
6924 static void mgsl_load_tx_dma_buffer(struct mgsl_struct *info,
6925 const char *Buffer, unsigned int BufferSize)
6927 unsigned short Copycount;
6929 DMABUFFERENTRY *pBufEntry;
6931 if ( debug_level >= DEBUG_LEVEL_DATA )
6932 mgsl_trace_block(info,Buffer, min_t(int, BufferSize, DMABUFFERSIZE), 1);
6934 if (info->params.flags & HDLC_FLAG_HDLC_LOOPMODE) {
6935 /* set CMR:13 to start transmit when
6936 * next GoAhead (abort) is received
6938 info->cmr_value |= BIT13;
6941 /* begin loading the frame in the next available tx dma
6942 * buffer, remember it's starting location for setting
6943 * up tx dma operation
6945 i = info->current_tx_buffer;
6946 info->start_tx_dma_buffer = i;
6948 /* Setup the status and RCC (Frame Size) fields of the 1st */
6949 /* buffer entry in the transmit DMA buffer list. */
6951 info->tx_buffer_list[i].status = info->cmr_value & 0xf000;
6952 info->tx_buffer_list[i].rcc = BufferSize;
6953 info->tx_buffer_list[i].count = BufferSize;
6955 /* Copy frame data from 1st source buffer to the DMA buffers. */
6956 /* The frame data may span multiple DMA buffers. */
6958 while( BufferSize ){
6959 /* Get a pointer to next DMA buffer entry. */
6960 pBufEntry = &info->tx_buffer_list[i++];
6962 if ( i == info->tx_buffer_count )
6965 /* Calculate the number of bytes that can be copied from */
6966 /* the source buffer to this DMA buffer. */
6967 if ( BufferSize > DMABUFFERSIZE )
6968 Copycount = DMABUFFERSIZE;
6970 Copycount = BufferSize;
6972 /* Actually copy data from source buffer to DMA buffer. */
6973 /* Also set the data count for this individual DMA buffer. */
6974 if ( info->bus_type == MGSL_BUS_TYPE_PCI )
6975 mgsl_load_pci_memory(pBufEntry->virt_addr, Buffer,Copycount);
6977 memcpy(pBufEntry->virt_addr, Buffer, Copycount);
6979 pBufEntry->count = Copycount;
6981 /* Advance source pointer and reduce remaining data count. */
6982 Buffer += Copycount;
6983 BufferSize -= Copycount;
6985 ++info->tx_dma_buffers_used;
6988 /* remember next available tx dma buffer */
6989 info->current_tx_buffer = i;
6991 } /* end of mgsl_load_tx_dma_buffer() */
6994 * mgsl_register_test()
6996 * Performs a register test of the 16C32.
6998 * Arguments: info pointer to device instance data
6999 * Return Value: true if test passed, otherwise false
7001 static bool mgsl_register_test( struct mgsl_struct *info )
7003 static unsigned short BitPatterns[] =
7004 { 0x0000, 0xffff, 0xaaaa, 0x5555, 0x1234, 0x6969, 0x9696, 0x0f0f };
7005 static unsigned int Patterncount = ARRAY_SIZE(BitPatterns);
7008 unsigned long flags;
7010 spin_lock_irqsave(&info->irq_spinlock,flags);
7013 /* Verify the reset state of some registers. */
7015 if ( (usc_InReg( info, SICR ) != 0) ||
7016 (usc_InReg( info, IVR ) != 0) ||
7017 (usc_InDmaReg( info, DIVR ) != 0) ){
7022 /* Write bit patterns to various registers but do it out of */
7023 /* sync, then read back and verify values. */
7025 for ( i = 0 ; i < Patterncount ; i++ ) {
7026 usc_OutReg( info, TC0R, BitPatterns[i] );
7027 usc_OutReg( info, TC1R, BitPatterns[(i+1)%Patterncount] );
7028 usc_OutReg( info, TCLR, BitPatterns[(i+2)%Patterncount] );
7029 usc_OutReg( info, RCLR, BitPatterns[(i+3)%Patterncount] );
7030 usc_OutReg( info, RSR, BitPatterns[(i+4)%Patterncount] );
7031 usc_OutDmaReg( info, TBCR, BitPatterns[(i+5)%Patterncount] );
7033 if ( (usc_InReg( info, TC0R ) != BitPatterns[i]) ||
7034 (usc_InReg( info, TC1R ) != BitPatterns[(i+1)%Patterncount]) ||
7035 (usc_InReg( info, TCLR ) != BitPatterns[(i+2)%Patterncount]) ||
7036 (usc_InReg( info, RCLR ) != BitPatterns[(i+3)%Patterncount]) ||
7037 (usc_InReg( info, RSR ) != BitPatterns[(i+4)%Patterncount]) ||
7038 (usc_InDmaReg( info, TBCR ) != BitPatterns[(i+5)%Patterncount]) ){
7046 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7050 } /* end of mgsl_register_test() */
7052 /* mgsl_irq_test() Perform interrupt test of the 16C32.
7054 * Arguments: info pointer to device instance data
7055 * Return Value: true if test passed, otherwise false
7057 static bool mgsl_irq_test( struct mgsl_struct *info )
7059 unsigned long EndTime;
7060 unsigned long flags;
7062 spin_lock_irqsave(&info->irq_spinlock,flags);
7066 * Setup 16C32 to interrupt on TxC pin (14MHz clock) transition.
7067 * The ISR sets irq_occurred to true.
7070 info->irq_occurred = false;
7072 /* Enable INTEN gate for ISA adapter (Port 6, Bit12) */
7073 /* Enable INTEN (Port 6, Bit12) */
7074 /* This connects the IRQ request signal to the ISA bus */
7075 /* on the ISA adapter. This has no effect for the PCI adapter */
7076 usc_OutReg( info, PCR, (unsigned short)((usc_InReg(info, PCR) | BIT13) & ~BIT12) );
7078 usc_EnableMasterIrqBit(info);
7079 usc_EnableInterrupts(info, IO_PIN);
7080 usc_ClearIrqPendingBits(info, IO_PIN);
7082 usc_UnlatchIostatusBits(info, MISCSTATUS_TXC_LATCHED);
7083 usc_EnableStatusIrqs(info, SICR_TXC_ACTIVE + SICR_TXC_INACTIVE);
7085 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7088 while( EndTime-- && !info->irq_occurred ) {
7089 msleep_interruptible(10);
7092 spin_lock_irqsave(&info->irq_spinlock,flags);
7094 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7096 return info->irq_occurred;
7098 } /* end of mgsl_irq_test() */
7102 * Perform a DMA test of the 16C32. A small frame is
7103 * transmitted via DMA from a transmit buffer to a receive buffer
7104 * using single buffer DMA mode.
7106 * Arguments: info pointer to device instance data
7107 * Return Value: true if test passed, otherwise false
7109 static bool mgsl_dma_test( struct mgsl_struct *info )
7111 unsigned short FifoLevel;
7112 unsigned long phys_addr;
7113 unsigned int FrameSize;
7117 unsigned short status=0;
7118 unsigned long EndTime;
7119 unsigned long flags;
7120 MGSL_PARAMS tmp_params;
7122 /* save current port options */
7123 memcpy(&tmp_params,&info->params,sizeof(MGSL_PARAMS));
7124 /* load default port options */
7125 memcpy(&info->params,&default_params,sizeof(MGSL_PARAMS));
7127 #define TESTFRAMESIZE 40
7129 spin_lock_irqsave(&info->irq_spinlock,flags);
7131 /* setup 16C32 for SDLC DMA transfer mode */
7134 usc_set_sdlc_mode(info);
7135 usc_enable_loopback(info,1);
7137 /* Reprogram the RDMR so that the 16C32 does NOT clear the count
7138 * field of the buffer entry after fetching buffer address. This
7139 * way we can detect a DMA failure for a DMA read (which should be
7140 * non-destructive to system memory) before we try and write to
7141 * memory (where a failure could corrupt system memory).
7144 /* Receive DMA mode Register (RDMR)
7146 * <15..14> 11 DMA mode = Linked List Buffer mode
7147 * <13> 1 RSBinA/L = store Rx status Block in List entry
7148 * <12> 0 1 = Clear count of List Entry after fetching
7149 * <11..10> 00 Address mode = Increment
7150 * <9> 1 Terminate Buffer on RxBound
7151 * <8> 0 Bus Width = 16bits
7152 * <7..0> ? status Bits (write as 0s)
7154 * 1110 0010 0000 0000 = 0xe200
7157 usc_OutDmaReg( info, RDMR, 0xe200 );
7159 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7162 /* SETUP TRANSMIT AND RECEIVE DMA BUFFERS */
7164 FrameSize = TESTFRAMESIZE;
7166 /* setup 1st transmit buffer entry: */
7167 /* with frame size and transmit control word */
7169 info->tx_buffer_list[0].count = FrameSize;
7170 info->tx_buffer_list[0].rcc = FrameSize;
7171 info->tx_buffer_list[0].status = 0x4000;
7173 /* build a transmit frame in 1st transmit DMA buffer */
7175 TmpPtr = info->tx_buffer_list[0].virt_addr;
7176 for (i = 0; i < FrameSize; i++ )
7179 /* setup 1st receive buffer entry: */
7180 /* clear status, set max receive buffer size */
7182 info->rx_buffer_list[0].status = 0;
7183 info->rx_buffer_list[0].count = FrameSize + 4;
7185 /* zero out the 1st receive buffer */
7187 memset( info->rx_buffer_list[0].virt_addr, 0, FrameSize + 4 );
7189 /* Set count field of next buffer entries to prevent */
7190 /* 16C32 from using buffers after the 1st one. */
7192 info->tx_buffer_list[1].count = 0;
7193 info->rx_buffer_list[1].count = 0;
7196 /***************************/
7197 /* Program 16C32 receiver. */
7198 /***************************/
7200 spin_lock_irqsave(&info->irq_spinlock,flags);
7202 /* setup DMA transfers */
7203 usc_RTCmd( info, RTCmd_PurgeRxFifo );
7205 /* program 16C32 receiver with physical address of 1st DMA buffer entry */
7206 phys_addr = info->rx_buffer_list[0].phys_entry;
7207 usc_OutDmaReg( info, NRARL, (unsigned short)phys_addr );
7208 usc_OutDmaReg( info, NRARU, (unsigned short)(phys_addr >> 16) );
7210 /* Clear the Rx DMA status bits (read RDMR) and start channel */
7211 usc_InDmaReg( info, RDMR );
7212 usc_DmaCmd( info, DmaCmd_InitRxChannel );
7214 /* Enable Receiver (RMR <1..0> = 10) */
7215 usc_OutReg( info, RMR, (unsigned short)((usc_InReg(info, RMR) & 0xfffc) | 0x0002) );
7217 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7220 /*************************************************************/
7221 /* WAIT FOR RECEIVER TO DMA ALL PARAMETERS FROM BUFFER ENTRY */
7222 /*************************************************************/
7224 /* Wait 100ms for interrupt. */
7225 EndTime = jiffies + msecs_to_jiffies(100);
7228 if (time_after(jiffies, EndTime)) {
7233 spin_lock_irqsave(&info->irq_spinlock,flags);
7234 status = usc_InDmaReg( info, RDMR );
7235 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7237 if ( !(status & BIT4) && (status & BIT5) ) {
7238 /* INITG (BIT 4) is inactive (no entry read in progress) AND */
7239 /* BUSY (BIT 5) is active (channel still active). */
7240 /* This means the buffer entry read has completed. */
7246 /******************************/
7247 /* Program 16C32 transmitter. */
7248 /******************************/
7250 spin_lock_irqsave(&info->irq_spinlock,flags);
7252 /* Program the Transmit Character Length Register (TCLR) */
7253 /* and clear FIFO (TCC is loaded with TCLR on FIFO clear) */
7255 usc_OutReg( info, TCLR, (unsigned short)info->tx_buffer_list[0].count );
7256 usc_RTCmd( info, RTCmd_PurgeTxFifo );
7258 /* Program the address of the 1st DMA Buffer Entry in linked list */
7260 phys_addr = info->tx_buffer_list[0].phys_entry;
7261 usc_OutDmaReg( info, NTARL, (unsigned short)phys_addr );
7262 usc_OutDmaReg( info, NTARU, (unsigned short)(phys_addr >> 16) );
7264 /* unlatch Tx status bits, and start transmit channel. */
7266 usc_OutReg( info, TCSR, (unsigned short)(( usc_InReg(info, TCSR) & 0x0f00) | 0xfa) );
7267 usc_DmaCmd( info, DmaCmd_InitTxChannel );
7269 /* wait for DMA controller to fill transmit FIFO */
7271 usc_TCmd( info, TCmd_SelectTicrTxFifostatus );
7273 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7276 /**********************************/
7277 /* WAIT FOR TRANSMIT FIFO TO FILL */
7278 /**********************************/
7281 EndTime = jiffies + msecs_to_jiffies(100);
7284 if (time_after(jiffies, EndTime)) {
7289 spin_lock_irqsave(&info->irq_spinlock,flags);
7290 FifoLevel = usc_InReg(info, TICR) >> 8;
7291 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7293 if ( FifoLevel < 16 )
7296 if ( FrameSize < 32 ) {
7297 /* This frame is smaller than the entire transmit FIFO */
7298 /* so wait for the entire frame to be loaded. */
7299 if ( FifoLevel <= (32 - FrameSize) )
7307 /* Enable 16C32 transmitter. */
7309 spin_lock_irqsave(&info->irq_spinlock,flags);
7311 /* Transmit mode Register (TMR), <1..0> = 10, Enable Transmitter */
7312 usc_TCmd( info, TCmd_SendFrame );
7313 usc_OutReg( info, TMR, (unsigned short)((usc_InReg(info, TMR) & 0xfffc) | 0x0002) );
7315 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7318 /******************************/
7319 /* WAIT FOR TRANSMIT COMPLETE */
7320 /******************************/
7323 EndTime = jiffies + msecs_to_jiffies(100);
7325 /* While timer not expired wait for transmit complete */
7327 spin_lock_irqsave(&info->irq_spinlock,flags);
7328 status = usc_InReg( info, TCSR );
7329 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7331 while ( !(status & (BIT6+BIT5+BIT4+BIT2+BIT1)) ) {
7332 if (time_after(jiffies, EndTime)) {
7337 spin_lock_irqsave(&info->irq_spinlock,flags);
7338 status = usc_InReg( info, TCSR );
7339 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7345 /* CHECK FOR TRANSMIT ERRORS */
7346 if ( status & (BIT5 + BIT1) )
7351 /* WAIT FOR RECEIVE COMPLETE */
7354 EndTime = jiffies + msecs_to_jiffies(100);
7356 /* Wait for 16C32 to write receive status to buffer entry. */
7357 status=info->rx_buffer_list[0].status;
7358 while ( status == 0 ) {
7359 if (time_after(jiffies, EndTime)) {
7363 status=info->rx_buffer_list[0].status;
7369 /* CHECK FOR RECEIVE ERRORS */
7370 status = info->rx_buffer_list[0].status;
7372 if ( status & (BIT8 + BIT3 + BIT1) ) {
7373 /* receive error has occurred */
7376 if ( memcmp( info->tx_buffer_list[0].virt_addr ,
7377 info->rx_buffer_list[0].virt_addr, FrameSize ) ){
7383 spin_lock_irqsave(&info->irq_spinlock,flags);
7385 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7387 /* restore current port options */
7388 memcpy(&info->params,&tmp_params,sizeof(MGSL_PARAMS));
7392 } /* end of mgsl_dma_test() */
7394 /* mgsl_adapter_test()
7396 * Perform the register, IRQ, and DMA tests for the 16C32.
7398 * Arguments: info pointer to device instance data
7399 * Return Value: 0 if success, otherwise -ENODEV
7401 static int mgsl_adapter_test( struct mgsl_struct *info )
7403 if ( debug_level >= DEBUG_LEVEL_INFO )
7404 printk( "%s(%d):Testing device %s\n",
7405 __FILE__,__LINE__,info->device_name );
7407 if ( !mgsl_register_test( info ) ) {
7408 info->init_error = DiagStatus_AddressFailure;
7409 printk( "%s(%d):Register test failure for device %s Addr=%04X\n",
7410 __FILE__,__LINE__,info->device_name, (unsigned short)(info->io_base) );
7414 if ( !mgsl_irq_test( info ) ) {
7415 info->init_error = DiagStatus_IrqFailure;
7416 printk( "%s(%d):Interrupt test failure for device %s IRQ=%d\n",
7417 __FILE__,__LINE__,info->device_name, (unsigned short)(info->irq_level) );
7421 if ( !mgsl_dma_test( info ) ) {
7422 info->init_error = DiagStatus_DmaFailure;
7423 printk( "%s(%d):DMA test failure for device %s DMA=%d\n",
7424 __FILE__,__LINE__,info->device_name, (unsigned short)(info->dma_level) );
7428 if ( debug_level >= DEBUG_LEVEL_INFO )
7429 printk( "%s(%d):device %s passed diagnostics\n",
7430 __FILE__,__LINE__,info->device_name );
7434 } /* end of mgsl_adapter_test() */
7436 /* mgsl_memory_test()
7438 * Test the shared memory on a PCI adapter.
7440 * Arguments: info pointer to device instance data
7441 * Return Value: true if test passed, otherwise false
7443 static bool mgsl_memory_test( struct mgsl_struct *info )
7445 static unsigned long BitPatterns[] =
7446 { 0x0, 0x55555555, 0xaaaaaaaa, 0x66666666, 0x99999999, 0xffffffff, 0x12345678 };
7447 unsigned long Patterncount = ARRAY_SIZE(BitPatterns);
7449 unsigned long TestLimit = SHARED_MEM_ADDRESS_SIZE/sizeof(unsigned long);
7450 unsigned long * TestAddr;
7452 if ( info->bus_type != MGSL_BUS_TYPE_PCI )
7455 TestAddr = (unsigned long *)info->memory_base;
7457 /* Test data lines with test pattern at one location. */
7459 for ( i = 0 ; i < Patterncount ; i++ ) {
7460 *TestAddr = BitPatterns[i];
7461 if ( *TestAddr != BitPatterns[i] )
7465 /* Test address lines with incrementing pattern over */
7466 /* entire address range. */
7468 for ( i = 0 ; i < TestLimit ; i++ ) {
7473 TestAddr = (unsigned long *)info->memory_base;
7475 for ( i = 0 ; i < TestLimit ; i++ ) {
7476 if ( *TestAddr != i * 4 )
7481 memset( info->memory_base, 0, SHARED_MEM_ADDRESS_SIZE );
7485 } /* End Of mgsl_memory_test() */
7488 /* mgsl_load_pci_memory()
7490 * Load a large block of data into the PCI shared memory.
7491 * Use this instead of memcpy() or memmove() to move data
7492 * into the PCI shared memory.
7496 * This function prevents the PCI9050 interface chip from hogging
7497 * the adapter local bus, which can starve the 16C32 by preventing
7498 * 16C32 bus master cycles.
7500 * The PCI9050 documentation says that the 9050 will always release
7501 * control of the local bus after completing the current read
7502 * or write operation.
7504 * It appears that as long as the PCI9050 write FIFO is full, the
7505 * PCI9050 treats all of the writes as a single burst transaction
7506 * and will not release the bus. This causes DMA latency problems
7507 * at high speeds when copying large data blocks to the shared
7510 * This function in effect, breaks the a large shared memory write
7511 * into multiple transations by interleaving a shared memory read
7512 * which will flush the write FIFO and 'complete' the write
7513 * transation. This allows any pending DMA request to gain control
7514 * of the local bus in a timely fasion.
7518 * TargetPtr pointer to target address in PCI shared memory
7519 * SourcePtr pointer to source buffer for data
7520 * count count in bytes of data to copy
7522 * Return Value: None
7524 static void mgsl_load_pci_memory( char* TargetPtr, const char* SourcePtr,
7525 unsigned short count )
7527 /* 16 32-bit writes @ 60ns each = 960ns max latency on local bus */
7528 #define PCI_LOAD_INTERVAL 64
7530 unsigned short Intervalcount = count / PCI_LOAD_INTERVAL;
7531 unsigned short Index;
7532 unsigned long Dummy;
7534 for ( Index = 0 ; Index < Intervalcount ; Index++ )
7536 memcpy(TargetPtr, SourcePtr, PCI_LOAD_INTERVAL);
7537 Dummy = *((volatile unsigned long *)TargetPtr);
7538 TargetPtr += PCI_LOAD_INTERVAL;
7539 SourcePtr += PCI_LOAD_INTERVAL;
7542 memcpy( TargetPtr, SourcePtr, count % PCI_LOAD_INTERVAL );
7544 } /* End Of mgsl_load_pci_memory() */
7546 static void mgsl_trace_block(struct mgsl_struct *info,const char* data, int count, int xmit)
7551 printk("%s tx data:\n",info->device_name);
7553 printk("%s rx data:\n",info->device_name);
7561 for(i=0;i<linecount;i++)
7562 printk("%02X ",(unsigned char)data[i]);
7565 for(i=0;i<linecount;i++) {
7566 if (data[i]>=040 && data[i]<=0176)
7567 printk("%c",data[i]);
7576 } /* end of mgsl_trace_block() */
7578 /* mgsl_tx_timeout()
7580 * called when HDLC frame times out
7581 * update stats and do tx completion processing
7583 * Arguments: context pointer to device instance data
7584 * Return Value: None
7586 static void mgsl_tx_timeout(unsigned long context)
7588 struct mgsl_struct *info = (struct mgsl_struct*)context;
7589 unsigned long flags;
7591 if ( debug_level >= DEBUG_LEVEL_INFO )
7592 printk( "%s(%d):mgsl_tx_timeout(%s)\n",
7593 __FILE__,__LINE__,info->device_name);
7594 if(info->tx_active &&
7595 (info->params.mode == MGSL_MODE_HDLC ||
7596 info->params.mode == MGSL_MODE_RAW) ) {
7597 info->icount.txtimeout++;
7599 spin_lock_irqsave(&info->irq_spinlock,flags);
7600 info->tx_active = false;
7601 info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
7603 if ( info->params.flags & HDLC_FLAG_HDLC_LOOPMODE )
7604 usc_loopmode_cancel_transmit( info );
7606 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7608 #if SYNCLINK_GENERIC_HDLC
7610 hdlcdev_tx_done(info);
7613 mgsl_bh_transmit(info);
7615 } /* end of mgsl_tx_timeout() */
7617 /* signal that there are no more frames to send, so that
7618 * line is 'released' by echoing RxD to TxD when current
7619 * transmission is complete (or immediately if no tx in progress).
7621 static int mgsl_loopmode_send_done( struct mgsl_struct * info )
7623 unsigned long flags;
7625 spin_lock_irqsave(&info->irq_spinlock,flags);
7626 if (info->params.flags & HDLC_FLAG_HDLC_LOOPMODE) {
7627 if (info->tx_active)
7628 info->loopmode_send_done_requested = true;
7630 usc_loopmode_send_done(info);
7632 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7637 /* release the line by echoing RxD to TxD
7638 * upon completion of a transmit frame
7640 static void usc_loopmode_send_done( struct mgsl_struct * info )
7642 info->loopmode_send_done_requested = false;
7643 /* clear CMR:13 to 0 to start echoing RxData to TxData */
7644 info->cmr_value &= ~BIT13;
7645 usc_OutReg(info, CMR, info->cmr_value);
7648 /* abort a transmit in progress while in HDLC LoopMode
7650 static void usc_loopmode_cancel_transmit( struct mgsl_struct * info )
7652 /* reset tx dma channel and purge TxFifo */
7653 usc_RTCmd( info, RTCmd_PurgeTxFifo );
7654 usc_DmaCmd( info, DmaCmd_ResetTxChannel );
7655 usc_loopmode_send_done( info );
7658 /* for HDLC/SDLC LoopMode, setting CMR:13 after the transmitter is enabled
7659 * is an Insert Into Loop action. Upon receipt of a GoAhead sequence (RxAbort)
7660 * we must clear CMR:13 to begin repeating TxData to RxData
7662 static void usc_loopmode_insert_request( struct mgsl_struct * info )
7664 info->loopmode_insert_requested = true;
7666 /* enable RxAbort irq. On next RxAbort, clear CMR:13 to
7667 * begin repeating TxData on RxData (complete insertion)
7669 usc_OutReg( info, RICR,
7670 (usc_InReg( info, RICR ) | RXSTATUS_ABORT_RECEIVED ) );
7672 /* set CMR:13 to insert into loop on next GoAhead (RxAbort) */
7673 info->cmr_value |= BIT13;
7674 usc_OutReg(info, CMR, info->cmr_value);
7677 /* return 1 if station is inserted into the loop, otherwise 0
7679 static int usc_loopmode_active( struct mgsl_struct * info)
7681 return usc_InReg( info, CCSR ) & BIT7 ? 1 : 0 ;
7684 #if SYNCLINK_GENERIC_HDLC
7687 * called by generic HDLC layer when protocol selected (PPP, frame relay, etc.)
7688 * set encoding and frame check sequence (FCS) options
7690 * dev pointer to network device structure
7691 * encoding serial encoding setting
7692 * parity FCS setting
7694 * returns 0 if success, otherwise error code
7696 static int hdlcdev_attach(struct net_device *dev, unsigned short encoding,
7697 unsigned short parity)
7699 struct mgsl_struct *info = dev_to_port(dev);
7700 unsigned char new_encoding;
7701 unsigned short new_crctype;
7703 /* return error if TTY interface open */
7704 if (info->port.count)
7709 case ENCODING_NRZ: new_encoding = HDLC_ENCODING_NRZ; break;
7710 case ENCODING_NRZI: new_encoding = HDLC_ENCODING_NRZI_SPACE; break;
7711 case ENCODING_FM_MARK: new_encoding = HDLC_ENCODING_BIPHASE_MARK; break;
7712 case ENCODING_FM_SPACE: new_encoding = HDLC_ENCODING_BIPHASE_SPACE; break;
7713 case ENCODING_MANCHESTER: new_encoding = HDLC_ENCODING_BIPHASE_LEVEL; break;
7714 default: return -EINVAL;
7719 case PARITY_NONE: new_crctype = HDLC_CRC_NONE; break;
7720 case PARITY_CRC16_PR1_CCITT: new_crctype = HDLC_CRC_16_CCITT; break;
7721 case PARITY_CRC32_PR1_CCITT: new_crctype = HDLC_CRC_32_CCITT; break;
7722 default: return -EINVAL;
7725 info->params.encoding = new_encoding;
7726 info->params.crc_type = new_crctype;
7728 /* if network interface up, reprogram hardware */
7730 mgsl_program_hw(info);
7736 * called by generic HDLC layer to send frame
7738 * skb socket buffer containing HDLC frame
7739 * dev pointer to network device structure
7741 * returns 0 if success, otherwise error code
7743 static int hdlcdev_xmit(struct sk_buff *skb, struct net_device *dev)
7745 struct mgsl_struct *info = dev_to_port(dev);
7746 unsigned long flags;
7748 if (debug_level >= DEBUG_LEVEL_INFO)
7749 printk(KERN_INFO "%s:hdlc_xmit(%s)\n",__FILE__,dev->name);
7751 /* stop sending until this frame completes */
7752 netif_stop_queue(dev);
7754 /* copy data to device buffers */
7755 info->xmit_cnt = skb->len;
7756 mgsl_load_tx_dma_buffer(info, skb->data, skb->len);
7758 /* update network statistics */
7759 dev->stats.tx_packets++;
7760 dev->stats.tx_bytes += skb->len;
7762 /* done with socket buffer, so free it */
7765 /* save start time for transmit timeout detection */
7766 dev->trans_start = jiffies;
7768 /* start hardware transmitter if necessary */
7769 spin_lock_irqsave(&info->irq_spinlock,flags);
7770 if (!info->tx_active)
7771 usc_start_transmitter(info);
7772 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7778 * called by network layer when interface enabled
7779 * claim resources and initialize hardware
7781 * dev pointer to network device structure
7783 * returns 0 if success, otherwise error code
7785 static int hdlcdev_open(struct net_device *dev)
7787 struct mgsl_struct *info = dev_to_port(dev);
7789 unsigned long flags;
7791 if (debug_level >= DEBUG_LEVEL_INFO)
7792 printk("%s:hdlcdev_open(%s)\n",__FILE__,dev->name);
7794 /* generic HDLC layer open processing */
7795 if ((rc = hdlc_open(dev)))
7798 /* arbitrate between network and tty opens */
7799 spin_lock_irqsave(&info->netlock, flags);
7800 if (info->port.count != 0 || info->netcount != 0) {
7801 printk(KERN_WARNING "%s: hdlc_open returning busy\n", dev->name);
7802 spin_unlock_irqrestore(&info->netlock, flags);
7806 spin_unlock_irqrestore(&info->netlock, flags);
7808 /* claim resources and init adapter */
7809 if ((rc = startup(info)) != 0) {
7810 spin_lock_irqsave(&info->netlock, flags);
7812 spin_unlock_irqrestore(&info->netlock, flags);
7816 /* assert DTR and RTS, apply hardware settings */
7817 info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
7818 mgsl_program_hw(info);
7820 /* enable network layer transmit */
7821 dev->trans_start = jiffies;
7822 netif_start_queue(dev);
7824 /* inform generic HDLC layer of current DCD status */
7825 spin_lock_irqsave(&info->irq_spinlock, flags);
7826 usc_get_serial_signals(info);
7827 spin_unlock_irqrestore(&info->irq_spinlock, flags);
7828 if (info->serial_signals & SerialSignal_DCD)
7829 netif_carrier_on(dev);
7831 netif_carrier_off(dev);
7836 * called by network layer when interface is disabled
7837 * shutdown hardware and release resources
7839 * dev pointer to network device structure
7841 * returns 0 if success, otherwise error code
7843 static int hdlcdev_close(struct net_device *dev)
7845 struct mgsl_struct *info = dev_to_port(dev);
7846 unsigned long flags;
7848 if (debug_level >= DEBUG_LEVEL_INFO)
7849 printk("%s:hdlcdev_close(%s)\n",__FILE__,dev->name);
7851 netif_stop_queue(dev);
7853 /* shutdown adapter and release resources */
7858 spin_lock_irqsave(&info->netlock, flags);
7860 spin_unlock_irqrestore(&info->netlock, flags);
7866 * called by network layer to process IOCTL call to network device
7868 * dev pointer to network device structure
7869 * ifr pointer to network interface request structure
7870 * cmd IOCTL command code
7872 * returns 0 if success, otherwise error code
7874 static int hdlcdev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
7876 const size_t size = sizeof(sync_serial_settings);
7877 sync_serial_settings new_line;
7878 sync_serial_settings __user *line = ifr->ifr_settings.ifs_ifsu.sync;
7879 struct mgsl_struct *info = dev_to_port(dev);
7882 if (debug_level >= DEBUG_LEVEL_INFO)
7883 printk("%s:hdlcdev_ioctl(%s)\n",__FILE__,dev->name);
7885 /* return error if TTY interface open */
7886 if (info->port.count)
7889 if (cmd != SIOCWANDEV)
7890 return hdlc_ioctl(dev, ifr, cmd);
7892 switch(ifr->ifr_settings.type) {
7893 case IF_GET_IFACE: /* return current sync_serial_settings */
7895 ifr->ifr_settings.type = IF_IFACE_SYNC_SERIAL;
7896 if (ifr->ifr_settings.size < size) {
7897 ifr->ifr_settings.size = size; /* data size wanted */
7901 flags = info->params.flags & (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
7902 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
7903 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
7904 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN);
7907 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN): new_line.clock_type = CLOCK_EXT; break;
7908 case (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG): new_line.clock_type = CLOCK_INT; break;
7909 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG): new_line.clock_type = CLOCK_TXINT; break;
7910 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN): new_line.clock_type = CLOCK_TXFROMRX; break;
7911 default: new_line.clock_type = CLOCK_DEFAULT;
7914 new_line.clock_rate = info->params.clock_speed;
7915 new_line.loopback = info->params.loopback ? 1:0;
7917 if (copy_to_user(line, &new_line, size))
7921 case IF_IFACE_SYNC_SERIAL: /* set sync_serial_settings */
7923 if(!capable(CAP_NET_ADMIN))
7925 if (copy_from_user(&new_line, line, size))
7928 switch (new_line.clock_type)
7930 case CLOCK_EXT: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN; break;
7931 case CLOCK_TXFROMRX: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN; break;
7932 case CLOCK_INT: flags = HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG; break;
7933 case CLOCK_TXINT: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG; break;
7934 case CLOCK_DEFAULT: flags = info->params.flags &
7935 (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
7936 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
7937 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
7938 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN); break;
7939 default: return -EINVAL;
7942 if (new_line.loopback != 0 && new_line.loopback != 1)
7945 info->params.flags &= ~(HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
7946 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
7947 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
7948 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN);
7949 info->params.flags |= flags;
7951 info->params.loopback = new_line.loopback;
7953 if (flags & (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG))
7954 info->params.clock_speed = new_line.clock_rate;
7956 info->params.clock_speed = 0;
7958 /* if network interface up, reprogram hardware */
7960 mgsl_program_hw(info);
7964 return hdlc_ioctl(dev, ifr, cmd);
7969 * called by network layer when transmit timeout is detected
7971 * dev pointer to network device structure
7973 static void hdlcdev_tx_timeout(struct net_device *dev)
7975 struct mgsl_struct *info = dev_to_port(dev);
7976 unsigned long flags;
7978 if (debug_level >= DEBUG_LEVEL_INFO)
7979 printk("hdlcdev_tx_timeout(%s)\n",dev->name);
7981 dev->stats.tx_errors++;
7982 dev->stats.tx_aborted_errors++;
7984 spin_lock_irqsave(&info->irq_spinlock,flags);
7985 usc_stop_transmitter(info);
7986 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7988 netif_wake_queue(dev);
7992 * called by device driver when transmit completes
7993 * reenable network layer transmit if stopped
7995 * info pointer to device instance information
7997 static void hdlcdev_tx_done(struct mgsl_struct *info)
7999 if (netif_queue_stopped(info->netdev))
8000 netif_wake_queue(info->netdev);
8004 * called by device driver when frame received
8005 * pass frame to network layer
8007 * info pointer to device instance information
8008 * buf pointer to buffer contianing frame data
8009 * size count of data bytes in buf
8011 static void hdlcdev_rx(struct mgsl_struct *info, char *buf, int size)
8013 struct sk_buff *skb = dev_alloc_skb(size);
8014 struct net_device *dev = info->netdev;
8016 if (debug_level >= DEBUG_LEVEL_INFO)
8017 printk("hdlcdev_rx(%s)\n", dev->name);
8020 printk(KERN_NOTICE "%s: can't alloc skb, dropping packet\n",
8022 dev->stats.rx_dropped++;
8026 memcpy(skb_put(skb, size), buf, size);
8028 skb->protocol = hdlc_type_trans(skb, dev);
8030 dev->stats.rx_packets++;
8031 dev->stats.rx_bytes += size;
8035 dev->last_rx = jiffies;
8039 * called by device driver when adding device instance
8040 * do generic HDLC initialization
8042 * info pointer to device instance information
8044 * returns 0 if success, otherwise error code
8046 static int hdlcdev_init(struct mgsl_struct *info)
8049 struct net_device *dev;
8052 /* allocate and initialize network and HDLC layer objects */
8054 if (!(dev = alloc_hdlcdev(info))) {
8055 printk(KERN_ERR "%s:hdlc device allocation failure\n",__FILE__);
8059 /* for network layer reporting purposes only */
8060 dev->base_addr = info->io_base;
8061 dev->irq = info->irq_level;
8062 dev->dma = info->dma_level;
8064 /* network layer callbacks and settings */
8065 dev->do_ioctl = hdlcdev_ioctl;
8066 dev->open = hdlcdev_open;
8067 dev->stop = hdlcdev_close;
8068 dev->tx_timeout = hdlcdev_tx_timeout;
8069 dev->watchdog_timeo = 10*HZ;
8070 dev->tx_queue_len = 50;
8072 /* generic HDLC layer callbacks and settings */
8073 hdlc = dev_to_hdlc(dev);
8074 hdlc->attach = hdlcdev_attach;
8075 hdlc->xmit = hdlcdev_xmit;
8077 /* register objects with HDLC layer */
8078 if ((rc = register_hdlc_device(dev))) {
8079 printk(KERN_WARNING "%s:unable to register hdlc device\n",__FILE__);
8089 * called by device driver when removing device instance
8090 * do generic HDLC cleanup
8092 * info pointer to device instance information
8094 static void hdlcdev_exit(struct mgsl_struct *info)
8096 unregister_hdlc_device(info->netdev);
8097 free_netdev(info->netdev);
8098 info->netdev = NULL;
8101 #endif /* CONFIG_HDLC */
8104 static int __devinit synclink_init_one (struct pci_dev *dev,
8105 const struct pci_device_id *ent)
8107 struct mgsl_struct *info;
8109 if (pci_enable_device(dev)) {
8110 printk("error enabling pci device %p\n", dev);
8114 if (!(info = mgsl_allocate_device())) {
8115 printk("can't allocate device instance data.\n");
8119 /* Copy user configuration info to device instance data */
8121 info->io_base = pci_resource_start(dev, 2);
8122 info->irq_level = dev->irq;
8123 info->phys_memory_base = pci_resource_start(dev, 3);
8125 /* Because veremap only works on page boundaries we must map
8126 * a larger area than is actually implemented for the LCR
8127 * memory range. We map a full page starting at the page boundary.
8129 info->phys_lcr_base = pci_resource_start(dev, 0);
8130 info->lcr_offset = info->phys_lcr_base & (PAGE_SIZE-1);
8131 info->phys_lcr_base &= ~(PAGE_SIZE-1);
8133 info->bus_type = MGSL_BUS_TYPE_PCI;
8134 info->io_addr_size = 8;
8135 info->irq_flags = IRQF_SHARED;
8137 if (dev->device == 0x0210) {
8138 /* Version 1 PCI9030 based universal PCI adapter */
8139 info->misc_ctrl_value = 0x007c4080;
8140 info->hw_version = 1;
8142 /* Version 0 PCI9050 based 5V PCI adapter
8143 * A PCI9050 bug prevents reading LCR registers if
8144 * LCR base address bit 7 is set. Maintain shadow
8145 * value so we can write to LCR misc control reg.
8147 info->misc_ctrl_value = 0x087e4546;
8148 info->hw_version = 0;
8151 mgsl_add_device(info);
8156 static void __devexit synclink_remove_one (struct pci_dev *dev)