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 */
309 #if SYNCLINK_GENERIC_HDLC
310 struct net_device *netdev;
314 #define MGSL_MAGIC 0x5401
317 * The size of the serial xmit buffer is 1 page, or 4096 bytes
319 #ifndef SERIAL_XMIT_SIZE
320 #define SERIAL_XMIT_SIZE 4096
324 * These macros define the offsets used in calculating the
325 * I/O address of the specified USC registers.
329 #define DCPIN 2 /* Bit 1 of I/O address */
330 #define SDPIN 4 /* Bit 2 of I/O address */
332 #define DCAR 0 /* DMA command/address register */
333 #define CCAR SDPIN /* channel command/address register */
334 #define DATAREG DCPIN + SDPIN /* serial data register */
339 * These macros define the register address (ordinal number)
340 * used for writing address/value pairs to the USC.
343 #define CMR 0x02 /* Channel mode Register */
344 #define CCSR 0x04 /* Channel Command/status Register */
345 #define CCR 0x06 /* Channel Control Register */
346 #define PSR 0x08 /* Port status Register */
347 #define PCR 0x0a /* Port Control Register */
348 #define TMDR 0x0c /* Test mode Data Register */
349 #define TMCR 0x0e /* Test mode Control Register */
350 #define CMCR 0x10 /* Clock mode Control Register */
351 #define HCR 0x12 /* Hardware Configuration Register */
352 #define IVR 0x14 /* Interrupt Vector Register */
353 #define IOCR 0x16 /* Input/Output Control Register */
354 #define ICR 0x18 /* Interrupt Control Register */
355 #define DCCR 0x1a /* Daisy Chain Control Register */
356 #define MISR 0x1c /* Misc Interrupt status Register */
357 #define SICR 0x1e /* status Interrupt Control Register */
358 #define RDR 0x20 /* Receive Data Register */
359 #define RMR 0x22 /* Receive mode Register */
360 #define RCSR 0x24 /* Receive Command/status Register */
361 #define RICR 0x26 /* Receive Interrupt Control Register */
362 #define RSR 0x28 /* Receive Sync Register */
363 #define RCLR 0x2a /* Receive count Limit Register */
364 #define RCCR 0x2c /* Receive Character count Register */
365 #define TC0R 0x2e /* Time Constant 0 Register */
366 #define TDR 0x30 /* Transmit Data Register */
367 #define TMR 0x32 /* Transmit mode Register */
368 #define TCSR 0x34 /* Transmit Command/status Register */
369 #define TICR 0x36 /* Transmit Interrupt Control Register */
370 #define TSR 0x38 /* Transmit Sync Register */
371 #define TCLR 0x3a /* Transmit count Limit Register */
372 #define TCCR 0x3c /* Transmit Character count Register */
373 #define TC1R 0x3e /* Time Constant 1 Register */
377 * MACRO DEFINITIONS FOR DMA REGISTERS
380 #define DCR 0x06 /* DMA Control Register (shared) */
381 #define DACR 0x08 /* DMA Array count Register (shared) */
382 #define BDCR 0x12 /* Burst/Dwell Control Register (shared) */
383 #define DIVR 0x14 /* DMA Interrupt Vector Register (shared) */
384 #define DICR 0x18 /* DMA Interrupt Control Register (shared) */
385 #define CDIR 0x1a /* Clear DMA Interrupt Register (shared) */
386 #define SDIR 0x1c /* Set DMA Interrupt Register (shared) */
388 #define TDMR 0x02 /* Transmit DMA mode Register */
389 #define TDIAR 0x1e /* Transmit DMA Interrupt Arm Register */
390 #define TBCR 0x2a /* Transmit Byte count Register */
391 #define TARL 0x2c /* Transmit Address Register (low) */
392 #define TARU 0x2e /* Transmit Address Register (high) */
393 #define NTBCR 0x3a /* Next Transmit Byte count Register */
394 #define NTARL 0x3c /* Next Transmit Address Register (low) */
395 #define NTARU 0x3e /* Next Transmit Address Register (high) */
397 #define RDMR 0x82 /* Receive DMA mode Register (non-shared) */
398 #define RDIAR 0x9e /* Receive DMA Interrupt Arm Register */
399 #define RBCR 0xaa /* Receive Byte count Register */
400 #define RARL 0xac /* Receive Address Register (low) */
401 #define RARU 0xae /* Receive Address Register (high) */
402 #define NRBCR 0xba /* Next Receive Byte count Register */
403 #define NRARL 0xbc /* Next Receive Address Register (low) */
404 #define NRARU 0xbe /* Next Receive Address Register (high) */
408 * MACRO DEFINITIONS FOR MODEM STATUS BITS
411 #define MODEMSTATUS_DTR 0x80
412 #define MODEMSTATUS_DSR 0x40
413 #define MODEMSTATUS_RTS 0x20
414 #define MODEMSTATUS_CTS 0x10
415 #define MODEMSTATUS_RI 0x04
416 #define MODEMSTATUS_DCD 0x01
420 * Channel Command/Address Register (CCAR) Command Codes
423 #define RTCmd_Null 0x0000
424 #define RTCmd_ResetHighestIus 0x1000
425 #define RTCmd_TriggerChannelLoadDma 0x2000
426 #define RTCmd_TriggerRxDma 0x2800
427 #define RTCmd_TriggerTxDma 0x3000
428 #define RTCmd_TriggerRxAndTxDma 0x3800
429 #define RTCmd_PurgeRxFifo 0x4800
430 #define RTCmd_PurgeTxFifo 0x5000
431 #define RTCmd_PurgeRxAndTxFifo 0x5800
432 #define RTCmd_LoadRcc 0x6800
433 #define RTCmd_LoadTcc 0x7000
434 #define RTCmd_LoadRccAndTcc 0x7800
435 #define RTCmd_LoadTC0 0x8800
436 #define RTCmd_LoadTC1 0x9000
437 #define RTCmd_LoadTC0AndTC1 0x9800
438 #define RTCmd_SerialDataLSBFirst 0xa000
439 #define RTCmd_SerialDataMSBFirst 0xa800
440 #define RTCmd_SelectBigEndian 0xb000
441 #define RTCmd_SelectLittleEndian 0xb800
445 * DMA Command/Address Register (DCAR) Command Codes
448 #define DmaCmd_Null 0x0000
449 #define DmaCmd_ResetTxChannel 0x1000
450 #define DmaCmd_ResetRxChannel 0x1200
451 #define DmaCmd_StartTxChannel 0x2000
452 #define DmaCmd_StartRxChannel 0x2200
453 #define DmaCmd_ContinueTxChannel 0x3000
454 #define DmaCmd_ContinueRxChannel 0x3200
455 #define DmaCmd_PauseTxChannel 0x4000
456 #define DmaCmd_PauseRxChannel 0x4200
457 #define DmaCmd_AbortTxChannel 0x5000
458 #define DmaCmd_AbortRxChannel 0x5200
459 #define DmaCmd_InitTxChannel 0x7000
460 #define DmaCmd_InitRxChannel 0x7200
461 #define DmaCmd_ResetHighestDmaIus 0x8000
462 #define DmaCmd_ResetAllChannels 0x9000
463 #define DmaCmd_StartAllChannels 0xa000
464 #define DmaCmd_ContinueAllChannels 0xb000
465 #define DmaCmd_PauseAllChannels 0xc000
466 #define DmaCmd_AbortAllChannels 0xd000
467 #define DmaCmd_InitAllChannels 0xf000
469 #define TCmd_Null 0x0000
470 #define TCmd_ClearTxCRC 0x2000
471 #define TCmd_SelectTicrTtsaData 0x4000
472 #define TCmd_SelectTicrTxFifostatus 0x5000
473 #define TCmd_SelectTicrIntLevel 0x6000
474 #define TCmd_SelectTicrdma_level 0x7000
475 #define TCmd_SendFrame 0x8000
476 #define TCmd_SendAbort 0x9000
477 #define TCmd_EnableDleInsertion 0xc000
478 #define TCmd_DisableDleInsertion 0xd000
479 #define TCmd_ClearEofEom 0xe000
480 #define TCmd_SetEofEom 0xf000
482 #define RCmd_Null 0x0000
483 #define RCmd_ClearRxCRC 0x2000
484 #define RCmd_EnterHuntmode 0x3000
485 #define RCmd_SelectRicrRtsaData 0x4000
486 #define RCmd_SelectRicrRxFifostatus 0x5000
487 #define RCmd_SelectRicrIntLevel 0x6000
488 #define RCmd_SelectRicrdma_level 0x7000
491 * Bits for enabling and disabling IRQs in Interrupt Control Register (ICR)
494 #define RECEIVE_STATUS BIT5
495 #define RECEIVE_DATA BIT4
496 #define TRANSMIT_STATUS BIT3
497 #define TRANSMIT_DATA BIT2
503 * Receive status Bits in Receive Command/status Register RCSR
506 #define RXSTATUS_SHORT_FRAME BIT8
507 #define RXSTATUS_CODE_VIOLATION BIT8
508 #define RXSTATUS_EXITED_HUNT BIT7
509 #define RXSTATUS_IDLE_RECEIVED BIT6
510 #define RXSTATUS_BREAK_RECEIVED BIT5
511 #define RXSTATUS_ABORT_RECEIVED BIT5
512 #define RXSTATUS_RXBOUND BIT4
513 #define RXSTATUS_CRC_ERROR BIT3
514 #define RXSTATUS_FRAMING_ERROR BIT3
515 #define RXSTATUS_ABORT BIT2
516 #define RXSTATUS_PARITY_ERROR BIT2
517 #define RXSTATUS_OVERRUN BIT1
518 #define RXSTATUS_DATA_AVAILABLE BIT0
519 #define RXSTATUS_ALL 0x01f6
520 #define usc_UnlatchRxstatusBits(a,b) usc_OutReg( (a), RCSR, (u16)((b) & RXSTATUS_ALL) )
523 * Values for setting transmit idle mode in
524 * Transmit Control/status Register (TCSR)
526 #define IDLEMODE_FLAGS 0x0000
527 #define IDLEMODE_ALT_ONE_ZERO 0x0100
528 #define IDLEMODE_ZERO 0x0200
529 #define IDLEMODE_ONE 0x0300
530 #define IDLEMODE_ALT_MARK_SPACE 0x0500
531 #define IDLEMODE_SPACE 0x0600
532 #define IDLEMODE_MARK 0x0700
533 #define IDLEMODE_MASK 0x0700
536 * IUSC revision identifiers
538 #define IUSC_SL1660 0x4d44
539 #define IUSC_PRE_SL1660 0x4553
542 * Transmit status Bits in Transmit Command/status Register (TCSR)
545 #define TCSR_PRESERVE 0x0F00
547 #define TCSR_UNDERWAIT BIT11
548 #define TXSTATUS_PREAMBLE_SENT BIT7
549 #define TXSTATUS_IDLE_SENT BIT6
550 #define TXSTATUS_ABORT_SENT BIT5
551 #define TXSTATUS_EOF_SENT BIT4
552 #define TXSTATUS_EOM_SENT BIT4
553 #define TXSTATUS_CRC_SENT BIT3
554 #define TXSTATUS_ALL_SENT BIT2
555 #define TXSTATUS_UNDERRUN BIT1
556 #define TXSTATUS_FIFO_EMPTY BIT0
557 #define TXSTATUS_ALL 0x00fa
558 #define usc_UnlatchTxstatusBits(a,b) usc_OutReg( (a), TCSR, (u16)((a)->tcsr_value + ((b) & 0x00FF)) )
561 #define MISCSTATUS_RXC_LATCHED BIT15
562 #define MISCSTATUS_RXC BIT14
563 #define MISCSTATUS_TXC_LATCHED BIT13
564 #define MISCSTATUS_TXC BIT12
565 #define MISCSTATUS_RI_LATCHED BIT11
566 #define MISCSTATUS_RI BIT10
567 #define MISCSTATUS_DSR_LATCHED BIT9
568 #define MISCSTATUS_DSR BIT8
569 #define MISCSTATUS_DCD_LATCHED BIT7
570 #define MISCSTATUS_DCD BIT6
571 #define MISCSTATUS_CTS_LATCHED BIT5
572 #define MISCSTATUS_CTS BIT4
573 #define MISCSTATUS_RCC_UNDERRUN BIT3
574 #define MISCSTATUS_DPLL_NO_SYNC BIT2
575 #define MISCSTATUS_BRG1_ZERO BIT1
576 #define MISCSTATUS_BRG0_ZERO BIT0
578 #define usc_UnlatchIostatusBits(a,b) usc_OutReg((a),MISR,(u16)((b) & 0xaaa0))
579 #define usc_UnlatchMiscstatusBits(a,b) usc_OutReg((a),MISR,(u16)((b) & 0x000f))
581 #define SICR_RXC_ACTIVE BIT15
582 #define SICR_RXC_INACTIVE BIT14
583 #define SICR_RXC (BIT15+BIT14)
584 #define SICR_TXC_ACTIVE BIT13
585 #define SICR_TXC_INACTIVE BIT12
586 #define SICR_TXC (BIT13+BIT12)
587 #define SICR_RI_ACTIVE BIT11
588 #define SICR_RI_INACTIVE BIT10
589 #define SICR_RI (BIT11+BIT10)
590 #define SICR_DSR_ACTIVE BIT9
591 #define SICR_DSR_INACTIVE BIT8
592 #define SICR_DSR (BIT9+BIT8)
593 #define SICR_DCD_ACTIVE BIT7
594 #define SICR_DCD_INACTIVE BIT6
595 #define SICR_DCD (BIT7+BIT6)
596 #define SICR_CTS_ACTIVE BIT5
597 #define SICR_CTS_INACTIVE BIT4
598 #define SICR_CTS (BIT5+BIT4)
599 #define SICR_RCC_UNDERFLOW BIT3
600 #define SICR_DPLL_NO_SYNC BIT2
601 #define SICR_BRG1_ZERO BIT1
602 #define SICR_BRG0_ZERO BIT0
604 void usc_DisableMasterIrqBit( struct mgsl_struct *info );
605 void usc_EnableMasterIrqBit( struct mgsl_struct *info );
606 void usc_EnableInterrupts( struct mgsl_struct *info, u16 IrqMask );
607 void usc_DisableInterrupts( struct mgsl_struct *info, u16 IrqMask );
608 void usc_ClearIrqPendingBits( struct mgsl_struct *info, u16 IrqMask );
610 #define usc_EnableInterrupts( a, b ) \
611 usc_OutReg( (a), ICR, (u16)((usc_InReg((a),ICR) & 0xff00) + 0xc0 + (b)) )
613 #define usc_DisableInterrupts( a, b ) \
614 usc_OutReg( (a), ICR, (u16)((usc_InReg((a),ICR) & 0xff00) + 0x80 + (b)) )
616 #define usc_EnableMasterIrqBit(a) \
617 usc_OutReg( (a), ICR, (u16)((usc_InReg((a),ICR) & 0x0f00) + 0xb000) )
619 #define usc_DisableMasterIrqBit(a) \
620 usc_OutReg( (a), ICR, (u16)(usc_InReg((a),ICR) & 0x7f00) )
622 #define usc_ClearIrqPendingBits( a, b ) usc_OutReg( (a), DCCR, 0x40 + (b) )
625 * Transmit status Bits in Transmit Control status Register (TCSR)
626 * and Transmit Interrupt Control Register (TICR) (except BIT2, BIT0)
629 #define TXSTATUS_PREAMBLE_SENT BIT7
630 #define TXSTATUS_IDLE_SENT BIT6
631 #define TXSTATUS_ABORT_SENT BIT5
632 #define TXSTATUS_EOF BIT4
633 #define TXSTATUS_CRC_SENT BIT3
634 #define TXSTATUS_ALL_SENT BIT2
635 #define TXSTATUS_UNDERRUN BIT1
636 #define TXSTATUS_FIFO_EMPTY BIT0
638 #define DICR_MASTER BIT15
639 #define DICR_TRANSMIT BIT0
640 #define DICR_RECEIVE BIT1
642 #define usc_EnableDmaInterrupts(a,b) \
643 usc_OutDmaReg( (a), DICR, (u16)(usc_InDmaReg((a),DICR) | (b)) )
645 #define usc_DisableDmaInterrupts(a,b) \
646 usc_OutDmaReg( (a), DICR, (u16)(usc_InDmaReg((a),DICR) & ~(b)) )
648 #define usc_EnableStatusIrqs(a,b) \
649 usc_OutReg( (a), SICR, (u16)(usc_InReg((a),SICR) | (b)) )
651 #define usc_DisablestatusIrqs(a,b) \
652 usc_OutReg( (a), SICR, (u16)(usc_InReg((a),SICR) & ~(b)) )
654 /* Transmit status Bits in Transmit Control status Register (TCSR) */
655 /* and Transmit Interrupt Control Register (TICR) (except BIT2, BIT0) */
658 #define DISABLE_UNCONDITIONAL 0
659 #define DISABLE_END_OF_FRAME 1
660 #define ENABLE_UNCONDITIONAL 2
661 #define ENABLE_AUTO_CTS 3
662 #define ENABLE_AUTO_DCD 3
663 #define usc_EnableTransmitter(a,b) \
664 usc_OutReg( (a), TMR, (u16)((usc_InReg((a),TMR) & 0xfffc) | (b)) )
665 #define usc_EnableReceiver(a,b) \
666 usc_OutReg( (a), RMR, (u16)((usc_InReg((a),RMR) & 0xfffc) | (b)) )
668 static u16 usc_InDmaReg( struct mgsl_struct *info, u16 Port );
669 static void usc_OutDmaReg( struct mgsl_struct *info, u16 Port, u16 Value );
670 static void usc_DmaCmd( struct mgsl_struct *info, u16 Cmd );
672 static u16 usc_InReg( struct mgsl_struct *info, u16 Port );
673 static void usc_OutReg( struct mgsl_struct *info, u16 Port, u16 Value );
674 static void usc_RTCmd( struct mgsl_struct *info, u16 Cmd );
675 void usc_RCmd( struct mgsl_struct *info, u16 Cmd );
676 void usc_TCmd( struct mgsl_struct *info, u16 Cmd );
678 #define usc_TCmd(a,b) usc_OutReg((a), TCSR, (u16)((a)->tcsr_value + (b)))
679 #define usc_RCmd(a,b) usc_OutReg((a), RCSR, (b))
681 #define usc_SetTransmitSyncChars(a,s0,s1) usc_OutReg((a), TSR, (u16)(((u16)s0<<8)|(u16)s1))
683 static void usc_process_rxoverrun_sync( struct mgsl_struct *info );
684 static void usc_start_receiver( struct mgsl_struct *info );
685 static void usc_stop_receiver( struct mgsl_struct *info );
687 static void usc_start_transmitter( struct mgsl_struct *info );
688 static void usc_stop_transmitter( struct mgsl_struct *info );
689 static void usc_set_txidle( struct mgsl_struct *info );
690 static void usc_load_txfifo( struct mgsl_struct *info );
692 static void usc_enable_aux_clock( struct mgsl_struct *info, u32 DataRate );
693 static void usc_enable_loopback( struct mgsl_struct *info, int enable );
695 static void usc_get_serial_signals( struct mgsl_struct *info );
696 static void usc_set_serial_signals( struct mgsl_struct *info );
698 static void usc_reset( struct mgsl_struct *info );
700 static void usc_set_sync_mode( struct mgsl_struct *info );
701 static void usc_set_sdlc_mode( struct mgsl_struct *info );
702 static void usc_set_async_mode( struct mgsl_struct *info );
703 static void usc_enable_async_clock( struct mgsl_struct *info, u32 DataRate );
705 static void usc_loopback_frame( struct mgsl_struct *info );
707 static void mgsl_tx_timeout(unsigned long context);
710 static void usc_loopmode_cancel_transmit( struct mgsl_struct * info );
711 static void usc_loopmode_insert_request( struct mgsl_struct * info );
712 static int usc_loopmode_active( struct mgsl_struct * info);
713 static void usc_loopmode_send_done( struct mgsl_struct * info );
715 static int mgsl_ioctl_common(struct mgsl_struct *info, unsigned int cmd, unsigned long arg);
717 #if SYNCLINK_GENERIC_HDLC
718 #define dev_to_port(D) (dev_to_hdlc(D)->priv)
719 static void hdlcdev_tx_done(struct mgsl_struct *info);
720 static void hdlcdev_rx(struct mgsl_struct *info, char *buf, int size);
721 static int hdlcdev_init(struct mgsl_struct *info);
722 static void hdlcdev_exit(struct mgsl_struct *info);
726 * Defines a BUS descriptor value for the PCI adapter
727 * local bus address ranges.
730 #define BUS_DESCRIPTOR( WrHold, WrDly, RdDly, Nwdd, Nwad, Nxda, Nrdd, Nrad ) \
741 static void mgsl_trace_block(struct mgsl_struct *info,const char* data, int count, int xmit);
744 * Adapter diagnostic routines
746 static bool mgsl_register_test( struct mgsl_struct *info );
747 static bool mgsl_irq_test( struct mgsl_struct *info );
748 static bool mgsl_dma_test( struct mgsl_struct *info );
749 static bool mgsl_memory_test( struct mgsl_struct *info );
750 static int mgsl_adapter_test( struct mgsl_struct *info );
753 * device and resource management routines
755 static int mgsl_claim_resources(struct mgsl_struct *info);
756 static void mgsl_release_resources(struct mgsl_struct *info);
757 static void mgsl_add_device(struct mgsl_struct *info);
758 static struct mgsl_struct* mgsl_allocate_device(void);
761 * DMA buffer manupulation functions.
763 static void mgsl_free_rx_frame_buffers( struct mgsl_struct *info, unsigned int StartIndex, unsigned int EndIndex );
764 static bool mgsl_get_rx_frame( struct mgsl_struct *info );
765 static bool mgsl_get_raw_rx_frame( struct mgsl_struct *info );
766 static void mgsl_reset_rx_dma_buffers( struct mgsl_struct *info );
767 static void mgsl_reset_tx_dma_buffers( struct mgsl_struct *info );
768 static int num_free_tx_dma_buffers(struct mgsl_struct *info);
769 static void mgsl_load_tx_dma_buffer( struct mgsl_struct *info, const char *Buffer, unsigned int BufferSize);
770 static void mgsl_load_pci_memory(char* TargetPtr, const char* SourcePtr, unsigned short count);
773 * DMA and Shared Memory buffer allocation and formatting
775 static int mgsl_allocate_dma_buffers(struct mgsl_struct *info);
776 static void mgsl_free_dma_buffers(struct mgsl_struct *info);
777 static int mgsl_alloc_frame_memory(struct mgsl_struct *info, DMABUFFERENTRY *BufferList,int Buffercount);
778 static void mgsl_free_frame_memory(struct mgsl_struct *info, DMABUFFERENTRY *BufferList,int Buffercount);
779 static int mgsl_alloc_buffer_list_memory(struct mgsl_struct *info);
780 static void mgsl_free_buffer_list_memory(struct mgsl_struct *info);
781 static int mgsl_alloc_intermediate_rxbuffer_memory(struct mgsl_struct *info);
782 static void mgsl_free_intermediate_rxbuffer_memory(struct mgsl_struct *info);
783 static int mgsl_alloc_intermediate_txbuffer_memory(struct mgsl_struct *info);
784 static void mgsl_free_intermediate_txbuffer_memory(struct mgsl_struct *info);
785 static bool load_next_tx_holding_buffer(struct mgsl_struct *info);
786 static int save_tx_buffer_request(struct mgsl_struct *info,const char *Buffer, unsigned int BufferSize);
789 * Bottom half interrupt handlers
791 static void mgsl_bh_handler(struct work_struct *work);
792 static void mgsl_bh_receive(struct mgsl_struct *info);
793 static void mgsl_bh_transmit(struct mgsl_struct *info);
794 static void mgsl_bh_status(struct mgsl_struct *info);
797 * Interrupt handler routines and dispatch table.
799 static void mgsl_isr_null( struct mgsl_struct *info );
800 static void mgsl_isr_transmit_data( struct mgsl_struct *info );
801 static void mgsl_isr_receive_data( struct mgsl_struct *info );
802 static void mgsl_isr_receive_status( struct mgsl_struct *info );
803 static void mgsl_isr_transmit_status( struct mgsl_struct *info );
804 static void mgsl_isr_io_pin( struct mgsl_struct *info );
805 static void mgsl_isr_misc( struct mgsl_struct *info );
806 static void mgsl_isr_receive_dma( struct mgsl_struct *info );
807 static void mgsl_isr_transmit_dma( struct mgsl_struct *info );
809 typedef void (*isr_dispatch_func)(struct mgsl_struct *);
811 static isr_dispatch_func UscIsrTable[7] =
816 mgsl_isr_transmit_data,
817 mgsl_isr_transmit_status,
818 mgsl_isr_receive_data,
819 mgsl_isr_receive_status
823 * ioctl call handlers
825 static int tiocmget(struct tty_struct *tty, struct file *file);
826 static int tiocmset(struct tty_struct *tty, struct file *file,
827 unsigned int set, unsigned int clear);
828 static int mgsl_get_stats(struct mgsl_struct * info, struct mgsl_icount
829 __user *user_icount);
830 static int mgsl_get_params(struct mgsl_struct * info, MGSL_PARAMS __user *user_params);
831 static int mgsl_set_params(struct mgsl_struct * info, MGSL_PARAMS __user *new_params);
832 static int mgsl_get_txidle(struct mgsl_struct * info, int __user *idle_mode);
833 static int mgsl_set_txidle(struct mgsl_struct * info, int idle_mode);
834 static int mgsl_txenable(struct mgsl_struct * info, int enable);
835 static int mgsl_txabort(struct mgsl_struct * info);
836 static int mgsl_rxenable(struct mgsl_struct * info, int enable);
837 static int mgsl_wait_event(struct mgsl_struct * info, int __user *mask);
838 static int mgsl_loopmode_send_done( struct mgsl_struct * info );
840 /* set non-zero on successful registration with PCI subsystem */
841 static bool pci_registered;
844 * Global linked list of SyncLink devices
846 static struct mgsl_struct *mgsl_device_list;
847 static int mgsl_device_count;
850 * Set this param to non-zero to load eax with the
851 * .text section address and breakpoint on module load.
852 * This is useful for use with gdb and add-symbol-file command.
854 static int break_on_load;
857 * Driver major number, defaults to zero to get auto
858 * assigned major number. May be forced as module parameter.
863 * Array of user specified options for ISA adapters.
865 static int io[MAX_ISA_DEVICES];
866 static int irq[MAX_ISA_DEVICES];
867 static int dma[MAX_ISA_DEVICES];
868 static int debug_level;
869 static int maxframe[MAX_TOTAL_DEVICES];
870 static int txdmabufs[MAX_TOTAL_DEVICES];
871 static int txholdbufs[MAX_TOTAL_DEVICES];
873 module_param(break_on_load, bool, 0);
874 module_param(ttymajor, int, 0);
875 module_param_array(io, int, NULL, 0);
876 module_param_array(irq, int, NULL, 0);
877 module_param_array(dma, int, NULL, 0);
878 module_param(debug_level, int, 0);
879 module_param_array(maxframe, int, NULL, 0);
880 module_param_array(txdmabufs, int, NULL, 0);
881 module_param_array(txholdbufs, int, NULL, 0);
883 static char *driver_name = "SyncLink serial driver";
884 static char *driver_version = "$Revision: 4.38 $";
886 static int synclink_init_one (struct pci_dev *dev,
887 const struct pci_device_id *ent);
888 static void synclink_remove_one (struct pci_dev *dev);
890 static struct pci_device_id synclink_pci_tbl[] = {
891 { PCI_VENDOR_ID_MICROGATE, PCI_DEVICE_ID_MICROGATE_USC, PCI_ANY_ID, PCI_ANY_ID, },
892 { PCI_VENDOR_ID_MICROGATE, 0x0210, PCI_ANY_ID, PCI_ANY_ID, },
893 { 0, }, /* terminate list */
895 MODULE_DEVICE_TABLE(pci, synclink_pci_tbl);
897 MODULE_LICENSE("GPL");
899 static struct pci_driver synclink_pci_driver = {
901 .id_table = synclink_pci_tbl,
902 .probe = synclink_init_one,
903 .remove = __devexit_p(synclink_remove_one),
906 static struct tty_driver *serial_driver;
908 /* number of characters left in xmit buffer before we ask for more */
909 #define WAKEUP_CHARS 256
912 static void mgsl_change_params(struct mgsl_struct *info);
913 static void mgsl_wait_until_sent(struct tty_struct *tty, int timeout);
916 * 1st function defined in .text section. Calling this function in
917 * init_module() followed by a breakpoint allows a remote debugger
918 * (gdb) to get the .text address for the add-symbol-file command.
919 * This allows remote debugging of dynamically loadable modules.
921 static void* mgsl_get_text_ptr(void)
923 return mgsl_get_text_ptr;
926 static inline int mgsl_paranoia_check(struct mgsl_struct *info,
927 char *name, const char *routine)
929 #ifdef MGSL_PARANOIA_CHECK
930 static const char *badmagic =
931 "Warning: bad magic number for mgsl struct (%s) in %s\n";
932 static const char *badinfo =
933 "Warning: null mgsl_struct for (%s) in %s\n";
936 printk(badinfo, name, routine);
939 if (info->magic != MGSL_MAGIC) {
940 printk(badmagic, name, routine);
951 * line discipline callback wrappers
953 * The wrappers maintain line discipline references
954 * while calling into the line discipline.
956 * ldisc_receive_buf - pass receive data to line discipline
959 static void ldisc_receive_buf(struct tty_struct *tty,
960 const __u8 *data, char *flags, int count)
962 struct tty_ldisc *ld;
965 ld = tty_ldisc_ref(tty);
967 if (ld->ops->receive_buf)
968 ld->ops->receive_buf(tty, data, flags, count);
973 /* mgsl_stop() throttle (stop) transmitter
975 * Arguments: tty pointer to tty info structure
978 static void mgsl_stop(struct tty_struct *tty)
980 struct mgsl_struct *info = tty->driver_data;
983 if (mgsl_paranoia_check(info, tty->name, "mgsl_stop"))
986 if ( debug_level >= DEBUG_LEVEL_INFO )
987 printk("mgsl_stop(%s)\n",info->device_name);
989 spin_lock_irqsave(&info->irq_spinlock,flags);
990 if (info->tx_enabled)
991 usc_stop_transmitter(info);
992 spin_unlock_irqrestore(&info->irq_spinlock,flags);
994 } /* end of mgsl_stop() */
996 /* mgsl_start() release (start) transmitter
998 * Arguments: tty pointer to tty info structure
1001 static void mgsl_start(struct tty_struct *tty)
1003 struct mgsl_struct *info = tty->driver_data;
1004 unsigned long flags;
1006 if (mgsl_paranoia_check(info, tty->name, "mgsl_start"))
1009 if ( debug_level >= DEBUG_LEVEL_INFO )
1010 printk("mgsl_start(%s)\n",info->device_name);
1012 spin_lock_irqsave(&info->irq_spinlock,flags);
1013 if (!info->tx_enabled)
1014 usc_start_transmitter(info);
1015 spin_unlock_irqrestore(&info->irq_spinlock,flags);
1017 } /* end of mgsl_start() */
1020 * Bottom half work queue access functions
1023 /* mgsl_bh_action() Return next bottom half action to perform.
1024 * Return Value: BH action code or 0 if nothing to do.
1026 static int mgsl_bh_action(struct mgsl_struct *info)
1028 unsigned long flags;
1031 spin_lock_irqsave(&info->irq_spinlock,flags);
1033 if (info->pending_bh & BH_RECEIVE) {
1034 info->pending_bh &= ~BH_RECEIVE;
1036 } else if (info->pending_bh & BH_TRANSMIT) {
1037 info->pending_bh &= ~BH_TRANSMIT;
1039 } else if (info->pending_bh & BH_STATUS) {
1040 info->pending_bh &= ~BH_STATUS;
1045 /* Mark BH routine as complete */
1046 info->bh_running = false;
1047 info->bh_requested = false;
1050 spin_unlock_irqrestore(&info->irq_spinlock,flags);
1056 * Perform bottom half processing of work items queued by ISR.
1058 static void mgsl_bh_handler(struct work_struct *work)
1060 struct mgsl_struct *info =
1061 container_of(work, struct mgsl_struct, task);
1067 if ( debug_level >= DEBUG_LEVEL_BH )
1068 printk( "%s(%d):mgsl_bh_handler(%s) entry\n",
1069 __FILE__,__LINE__,info->device_name);
1071 info->bh_running = true;
1073 while((action = mgsl_bh_action(info)) != 0) {
1075 /* Process work item */
1076 if ( debug_level >= DEBUG_LEVEL_BH )
1077 printk( "%s(%d):mgsl_bh_handler() work item action=%d\n",
1078 __FILE__,__LINE__,action);
1083 mgsl_bh_receive(info);
1086 mgsl_bh_transmit(info);
1089 mgsl_bh_status(info);
1092 /* unknown work item ID */
1093 printk("Unknown work item ID=%08X!\n", action);
1098 if ( debug_level >= DEBUG_LEVEL_BH )
1099 printk( "%s(%d):mgsl_bh_handler(%s) exit\n",
1100 __FILE__,__LINE__,info->device_name);
1103 static void mgsl_bh_receive(struct mgsl_struct *info)
1105 bool (*get_rx_frame)(struct mgsl_struct *info) =
1106 (info->params.mode == MGSL_MODE_HDLC ? mgsl_get_rx_frame : mgsl_get_raw_rx_frame);
1108 if ( debug_level >= DEBUG_LEVEL_BH )
1109 printk( "%s(%d):mgsl_bh_receive(%s)\n",
1110 __FILE__,__LINE__,info->device_name);
1114 if (info->rx_rcc_underrun) {
1115 unsigned long flags;
1116 spin_lock_irqsave(&info->irq_spinlock,flags);
1117 usc_start_receiver(info);
1118 spin_unlock_irqrestore(&info->irq_spinlock,flags);
1121 } while(get_rx_frame(info));
1124 static void mgsl_bh_transmit(struct mgsl_struct *info)
1126 struct tty_struct *tty = info->port.tty;
1127 unsigned long flags;
1129 if ( debug_level >= DEBUG_LEVEL_BH )
1130 printk( "%s(%d):mgsl_bh_transmit() entry on %s\n",
1131 __FILE__,__LINE__,info->device_name);
1136 /* if transmitter idle and loopmode_send_done_requested
1137 * then start echoing RxD to TxD
1139 spin_lock_irqsave(&info->irq_spinlock,flags);
1140 if ( !info->tx_active && info->loopmode_send_done_requested )
1141 usc_loopmode_send_done( info );
1142 spin_unlock_irqrestore(&info->irq_spinlock,flags);
1145 static void mgsl_bh_status(struct mgsl_struct *info)
1147 if ( debug_level >= DEBUG_LEVEL_BH )
1148 printk( "%s(%d):mgsl_bh_status() entry on %s\n",
1149 __FILE__,__LINE__,info->device_name);
1151 info->ri_chkcount = 0;
1152 info->dsr_chkcount = 0;
1153 info->dcd_chkcount = 0;
1154 info->cts_chkcount = 0;
1157 /* mgsl_isr_receive_status()
1159 * Service a receive status interrupt. The type of status
1160 * interrupt is indicated by the state of the RCSR.
1161 * This is only used for HDLC mode.
1163 * Arguments: info pointer to device instance data
1164 * Return Value: None
1166 static void mgsl_isr_receive_status( struct mgsl_struct *info )
1168 u16 status = usc_InReg( info, RCSR );
1170 if ( debug_level >= DEBUG_LEVEL_ISR )
1171 printk("%s(%d):mgsl_isr_receive_status status=%04X\n",
1172 __FILE__,__LINE__,status);
1174 if ( (status & RXSTATUS_ABORT_RECEIVED) &&
1175 info->loopmode_insert_requested &&
1176 usc_loopmode_active(info) )
1178 ++info->icount.rxabort;
1179 info->loopmode_insert_requested = false;
1181 /* clear CMR:13 to start echoing RxD to TxD */
1182 info->cmr_value &= ~BIT13;
1183 usc_OutReg(info, CMR, info->cmr_value);
1185 /* disable received abort irq (no longer required) */
1186 usc_OutReg(info, RICR,
1187 (usc_InReg(info, RICR) & ~RXSTATUS_ABORT_RECEIVED));
1190 if (status & (RXSTATUS_EXITED_HUNT + RXSTATUS_IDLE_RECEIVED)) {
1191 if (status & RXSTATUS_EXITED_HUNT)
1192 info->icount.exithunt++;
1193 if (status & RXSTATUS_IDLE_RECEIVED)
1194 info->icount.rxidle++;
1195 wake_up_interruptible(&info->event_wait_q);
1198 if (status & RXSTATUS_OVERRUN){
1199 info->icount.rxover++;
1200 usc_process_rxoverrun_sync( info );
1203 usc_ClearIrqPendingBits( info, RECEIVE_STATUS );
1204 usc_UnlatchRxstatusBits( info, status );
1206 } /* end of mgsl_isr_receive_status() */
1208 /* mgsl_isr_transmit_status()
1210 * Service a transmit status interrupt
1211 * HDLC mode :end of transmit frame
1212 * Async mode:all data is sent
1213 * transmit status is indicated by bits in the TCSR.
1215 * Arguments: info pointer to device instance data
1216 * Return Value: None
1218 static void mgsl_isr_transmit_status( struct mgsl_struct *info )
1220 u16 status = usc_InReg( info, TCSR );
1222 if ( debug_level >= DEBUG_LEVEL_ISR )
1223 printk("%s(%d):mgsl_isr_transmit_status status=%04X\n",
1224 __FILE__,__LINE__,status);
1226 usc_ClearIrqPendingBits( info, TRANSMIT_STATUS );
1227 usc_UnlatchTxstatusBits( info, status );
1229 if ( status & (TXSTATUS_UNDERRUN | TXSTATUS_ABORT_SENT) )
1231 /* finished sending HDLC abort. This may leave */
1232 /* the TxFifo with data from the aborted frame */
1233 /* so purge the TxFifo. Also shutdown the DMA */
1234 /* channel in case there is data remaining in */
1235 /* the DMA buffer */
1236 usc_DmaCmd( info, DmaCmd_ResetTxChannel );
1237 usc_RTCmd( info, RTCmd_PurgeTxFifo );
1240 if ( status & TXSTATUS_EOF_SENT )
1241 info->icount.txok++;
1242 else if ( status & TXSTATUS_UNDERRUN )
1243 info->icount.txunder++;
1244 else if ( status & TXSTATUS_ABORT_SENT )
1245 info->icount.txabort++;
1247 info->icount.txunder++;
1249 info->tx_active = false;
1250 info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
1251 del_timer(&info->tx_timer);
1253 if ( info->drop_rts_on_tx_done ) {
1254 usc_get_serial_signals( info );
1255 if ( info->serial_signals & SerialSignal_RTS ) {
1256 info->serial_signals &= ~SerialSignal_RTS;
1257 usc_set_serial_signals( info );
1259 info->drop_rts_on_tx_done = false;
1262 #if SYNCLINK_GENERIC_HDLC
1264 hdlcdev_tx_done(info);
1268 if (info->port.tty->stopped || info->port.tty->hw_stopped) {
1269 usc_stop_transmitter(info);
1272 info->pending_bh |= BH_TRANSMIT;
1275 } /* end of mgsl_isr_transmit_status() */
1277 /* mgsl_isr_io_pin()
1279 * Service an Input/Output pin interrupt. The type of
1280 * interrupt is indicated by bits in the MISR
1282 * Arguments: info pointer to device instance data
1283 * Return Value: None
1285 static void mgsl_isr_io_pin( struct mgsl_struct *info )
1287 struct mgsl_icount *icount;
1288 u16 status = usc_InReg( info, MISR );
1290 if ( debug_level >= DEBUG_LEVEL_ISR )
1291 printk("%s(%d):mgsl_isr_io_pin status=%04X\n",
1292 __FILE__,__LINE__,status);
1294 usc_ClearIrqPendingBits( info, IO_PIN );
1295 usc_UnlatchIostatusBits( info, status );
1297 if (status & (MISCSTATUS_CTS_LATCHED | MISCSTATUS_DCD_LATCHED |
1298 MISCSTATUS_DSR_LATCHED | MISCSTATUS_RI_LATCHED) ) {
1299 icount = &info->icount;
1300 /* update input line counters */
1301 if (status & MISCSTATUS_RI_LATCHED) {
1302 if ((info->ri_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1303 usc_DisablestatusIrqs(info,SICR_RI);
1305 if ( status & MISCSTATUS_RI )
1306 info->input_signal_events.ri_up++;
1308 info->input_signal_events.ri_down++;
1310 if (status & MISCSTATUS_DSR_LATCHED) {
1311 if ((info->dsr_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1312 usc_DisablestatusIrqs(info,SICR_DSR);
1314 if ( status & MISCSTATUS_DSR )
1315 info->input_signal_events.dsr_up++;
1317 info->input_signal_events.dsr_down++;
1319 if (status & MISCSTATUS_DCD_LATCHED) {
1320 if ((info->dcd_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1321 usc_DisablestatusIrqs(info,SICR_DCD);
1323 if (status & MISCSTATUS_DCD) {
1324 info->input_signal_events.dcd_up++;
1326 info->input_signal_events.dcd_down++;
1327 #if SYNCLINK_GENERIC_HDLC
1328 if (info->netcount) {
1329 if (status & MISCSTATUS_DCD)
1330 netif_carrier_on(info->netdev);
1332 netif_carrier_off(info->netdev);
1336 if (status & MISCSTATUS_CTS_LATCHED)
1338 if ((info->cts_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1339 usc_DisablestatusIrqs(info,SICR_CTS);
1341 if ( status & MISCSTATUS_CTS )
1342 info->input_signal_events.cts_up++;
1344 info->input_signal_events.cts_down++;
1346 wake_up_interruptible(&info->status_event_wait_q);
1347 wake_up_interruptible(&info->event_wait_q);
1349 if ( (info->port.flags & ASYNC_CHECK_CD) &&
1350 (status & MISCSTATUS_DCD_LATCHED) ) {
1351 if ( debug_level >= DEBUG_LEVEL_ISR )
1352 printk("%s CD now %s...", info->device_name,
1353 (status & MISCSTATUS_DCD) ? "on" : "off");
1354 if (status & MISCSTATUS_DCD)
1355 wake_up_interruptible(&info->port.open_wait);
1357 if ( debug_level >= DEBUG_LEVEL_ISR )
1358 printk("doing serial hangup...");
1360 tty_hangup(info->port.tty);
1364 if ( (info->port.flags & ASYNC_CTS_FLOW) &&
1365 (status & MISCSTATUS_CTS_LATCHED) ) {
1366 if (info->port.tty->hw_stopped) {
1367 if (status & MISCSTATUS_CTS) {
1368 if ( debug_level >= DEBUG_LEVEL_ISR )
1369 printk("CTS tx start...");
1371 info->port.tty->hw_stopped = 0;
1372 usc_start_transmitter(info);
1373 info->pending_bh |= BH_TRANSMIT;
1377 if (!(status & MISCSTATUS_CTS)) {
1378 if ( debug_level >= DEBUG_LEVEL_ISR )
1379 printk("CTS tx stop...");
1381 info->port.tty->hw_stopped = 1;
1382 usc_stop_transmitter(info);
1388 info->pending_bh |= BH_STATUS;
1390 /* for diagnostics set IRQ flag */
1391 if ( status & MISCSTATUS_TXC_LATCHED ){
1392 usc_OutReg( info, SICR,
1393 (unsigned short)(usc_InReg(info,SICR) & ~(SICR_TXC_ACTIVE+SICR_TXC_INACTIVE)) );
1394 usc_UnlatchIostatusBits( info, MISCSTATUS_TXC_LATCHED );
1395 info->irq_occurred = true;
1398 } /* end of mgsl_isr_io_pin() */
1400 /* mgsl_isr_transmit_data()
1402 * Service a transmit data interrupt (async mode only).
1404 * Arguments: info pointer to device instance data
1405 * Return Value: None
1407 static void mgsl_isr_transmit_data( struct mgsl_struct *info )
1409 if ( debug_level >= DEBUG_LEVEL_ISR )
1410 printk("%s(%d):mgsl_isr_transmit_data xmit_cnt=%d\n",
1411 __FILE__,__LINE__,info->xmit_cnt);
1413 usc_ClearIrqPendingBits( info, TRANSMIT_DATA );
1415 if (info->port.tty->stopped || info->port.tty->hw_stopped) {
1416 usc_stop_transmitter(info);
1420 if ( info->xmit_cnt )
1421 usc_load_txfifo( info );
1423 info->tx_active = false;
1425 if (info->xmit_cnt < WAKEUP_CHARS)
1426 info->pending_bh |= BH_TRANSMIT;
1428 } /* end of mgsl_isr_transmit_data() */
1430 /* mgsl_isr_receive_data()
1432 * Service a receive data interrupt. This occurs
1433 * when operating in asynchronous interrupt transfer mode.
1434 * The receive data FIFO is flushed to the receive data buffers.
1436 * Arguments: info pointer to device instance data
1437 * Return Value: None
1439 static void mgsl_isr_receive_data( struct mgsl_struct *info )
1444 unsigned char DataByte;
1445 struct tty_struct *tty = info->port.tty;
1446 struct mgsl_icount *icount = &info->icount;
1448 if ( debug_level >= DEBUG_LEVEL_ISR )
1449 printk("%s(%d):mgsl_isr_receive_data\n",
1452 usc_ClearIrqPendingBits( info, RECEIVE_DATA );
1454 /* select FIFO status for RICR readback */
1455 usc_RCmd( info, RCmd_SelectRicrRxFifostatus );
1457 /* clear the Wordstatus bit so that status readback */
1458 /* only reflects the status of this byte */
1459 usc_OutReg( info, RICR+LSBONLY, (u16)(usc_InReg(info, RICR+LSBONLY) & ~BIT3 ));
1461 /* flush the receive FIFO */
1463 while( (Fifocount = (usc_InReg(info,RICR) >> 8)) ) {
1466 /* read one byte from RxFIFO */
1467 outw( (inw(info->io_base + CCAR) & 0x0780) | (RDR+LSBONLY),
1468 info->io_base + CCAR );
1469 DataByte = inb( info->io_base + CCAR );
1471 /* get the status of the received byte */
1472 status = usc_InReg(info, RCSR);
1473 if ( status & (RXSTATUS_FRAMING_ERROR + RXSTATUS_PARITY_ERROR +
1474 RXSTATUS_OVERRUN + RXSTATUS_BREAK_RECEIVED) )
1475 usc_UnlatchRxstatusBits(info,RXSTATUS_ALL);
1480 if ( status & (RXSTATUS_FRAMING_ERROR + RXSTATUS_PARITY_ERROR +
1481 RXSTATUS_OVERRUN + RXSTATUS_BREAK_RECEIVED) ) {
1482 printk("rxerr=%04X\n",status);
1483 /* update error statistics */
1484 if ( status & RXSTATUS_BREAK_RECEIVED ) {
1485 status &= ~(RXSTATUS_FRAMING_ERROR + RXSTATUS_PARITY_ERROR);
1487 } else if (status & RXSTATUS_PARITY_ERROR)
1489 else if (status & RXSTATUS_FRAMING_ERROR)
1491 else if (status & RXSTATUS_OVERRUN) {
1492 /* must issue purge fifo cmd before */
1493 /* 16C32 accepts more receive chars */
1494 usc_RTCmd(info,RTCmd_PurgeRxFifo);
1498 /* discard char if tty control flags say so */
1499 if (status & info->ignore_status_mask)
1502 status &= info->read_status_mask;
1504 if (status & RXSTATUS_BREAK_RECEIVED) {
1506 if (info->port.flags & ASYNC_SAK)
1508 } else if (status & RXSTATUS_PARITY_ERROR)
1510 else if (status & RXSTATUS_FRAMING_ERROR)
1512 } /* end of if (error) */
1513 tty_insert_flip_char(tty, DataByte, flag);
1514 if (status & RXSTATUS_OVERRUN) {
1515 /* Overrun is special, since it's
1516 * reported immediately, and doesn't
1517 * affect the current character
1519 work += tty_insert_flip_char(tty, 0, TTY_OVERRUN);
1523 if ( debug_level >= DEBUG_LEVEL_ISR ) {
1524 printk("%s(%d):rx=%d brk=%d parity=%d frame=%d overrun=%d\n",
1525 __FILE__,__LINE__,icount->rx,icount->brk,
1526 icount->parity,icount->frame,icount->overrun);
1530 tty_flip_buffer_push(tty);
1535 * Service a miscellaneous interrupt source.
1537 * Arguments: info pointer to device extension (instance data)
1538 * Return Value: None
1540 static void mgsl_isr_misc( struct mgsl_struct *info )
1542 u16 status = usc_InReg( info, MISR );
1544 if ( debug_level >= DEBUG_LEVEL_ISR )
1545 printk("%s(%d):mgsl_isr_misc status=%04X\n",
1546 __FILE__,__LINE__,status);
1548 if ((status & MISCSTATUS_RCC_UNDERRUN) &&
1549 (info->params.mode == MGSL_MODE_HDLC)) {
1551 /* turn off receiver and rx DMA */
1552 usc_EnableReceiver(info,DISABLE_UNCONDITIONAL);
1553 usc_DmaCmd(info, DmaCmd_ResetRxChannel);
1554 usc_UnlatchRxstatusBits(info, RXSTATUS_ALL);
1555 usc_ClearIrqPendingBits(info, RECEIVE_DATA + RECEIVE_STATUS);
1556 usc_DisableInterrupts(info, RECEIVE_DATA + RECEIVE_STATUS);
1558 /* schedule BH handler to restart receiver */
1559 info->pending_bh |= BH_RECEIVE;
1560 info->rx_rcc_underrun = true;
1563 usc_ClearIrqPendingBits( info, MISC );
1564 usc_UnlatchMiscstatusBits( info, status );
1566 } /* end of mgsl_isr_misc() */
1570 * Services undefined interrupt vectors from the
1571 * USC. (hence this function SHOULD never be called)
1573 * Arguments: info pointer to device extension (instance data)
1574 * Return Value: None
1576 static void mgsl_isr_null( struct mgsl_struct *info )
1579 } /* end of mgsl_isr_null() */
1581 /* mgsl_isr_receive_dma()
1583 * Service a receive DMA channel interrupt.
1584 * For this driver there are two sources of receive DMA interrupts
1585 * as identified in the Receive DMA mode Register (RDMR):
1587 * BIT3 EOA/EOL End of List, all receive buffers in receive
1588 * buffer list have been filled (no more free buffers
1589 * available). The DMA controller has shut down.
1591 * BIT2 EOB End of Buffer. This interrupt occurs when a receive
1592 * DMA buffer is terminated in response to completion
1593 * of a good frame or a frame with errors. The status
1594 * of the frame is stored in the buffer entry in the
1595 * list of receive buffer entries.
1597 * Arguments: info pointer to device instance data
1598 * Return Value: None
1600 static void mgsl_isr_receive_dma( struct mgsl_struct *info )
1604 /* clear interrupt pending and IUS bit for Rx DMA IRQ */
1605 usc_OutDmaReg( info, CDIR, BIT9+BIT1 );
1607 /* Read the receive DMA status to identify interrupt type. */
1608 /* This also clears the status bits. */
1609 status = usc_InDmaReg( info, RDMR );
1611 if ( debug_level >= DEBUG_LEVEL_ISR )
1612 printk("%s(%d):mgsl_isr_receive_dma(%s) status=%04X\n",
1613 __FILE__,__LINE__,info->device_name,status);
1615 info->pending_bh |= BH_RECEIVE;
1617 if ( status & BIT3 ) {
1618 info->rx_overflow = true;
1619 info->icount.buf_overrun++;
1622 } /* end of mgsl_isr_receive_dma() */
1624 /* mgsl_isr_transmit_dma()
1626 * This function services a transmit DMA channel interrupt.
1628 * For this driver there is one source of transmit DMA interrupts
1629 * as identified in the Transmit DMA Mode Register (TDMR):
1631 * BIT2 EOB End of Buffer. This interrupt occurs when a
1632 * transmit DMA buffer has been emptied.
1634 * The driver maintains enough transmit DMA buffers to hold at least
1635 * one max frame size transmit frame. When operating in a buffered
1636 * transmit mode, there may be enough transmit DMA buffers to hold at
1637 * least two or more max frame size frames. On an EOB condition,
1638 * determine if there are any queued transmit buffers and copy into
1639 * transmit DMA buffers if we have room.
1641 * Arguments: info pointer to device instance data
1642 * Return Value: None
1644 static void mgsl_isr_transmit_dma( struct mgsl_struct *info )
1648 /* clear interrupt pending and IUS bit for Tx DMA IRQ */
1649 usc_OutDmaReg(info, CDIR, BIT8+BIT0 );
1651 /* Read the transmit DMA status to identify interrupt type. */
1652 /* This also clears the status bits. */
1654 status = usc_InDmaReg( info, TDMR );
1656 if ( debug_level >= DEBUG_LEVEL_ISR )
1657 printk("%s(%d):mgsl_isr_transmit_dma(%s) status=%04X\n",
1658 __FILE__,__LINE__,info->device_name,status);
1660 if ( status & BIT2 ) {
1661 --info->tx_dma_buffers_used;
1663 /* if there are transmit frames queued,
1664 * try to load the next one
1666 if ( load_next_tx_holding_buffer(info) ) {
1667 /* if call returns non-zero value, we have
1668 * at least one free tx holding buffer
1670 info->pending_bh |= BH_TRANSMIT;
1674 } /* end of mgsl_isr_transmit_dma() */
1678 * Interrupt service routine entry point.
1682 * irq interrupt number that caused interrupt
1683 * dev_id device ID supplied during interrupt registration
1685 * Return Value: None
1687 static irqreturn_t mgsl_interrupt(int dummy, void *dev_id)
1689 struct mgsl_struct *info = dev_id;
1693 if ( debug_level >= DEBUG_LEVEL_ISR )
1694 printk(KERN_DEBUG "%s(%d):mgsl_interrupt(%d)entry.\n",
1695 __FILE__, __LINE__, info->irq_level);
1697 spin_lock(&info->irq_spinlock);
1700 /* Read the interrupt vectors from hardware. */
1701 UscVector = usc_InReg(info, IVR) >> 9;
1702 DmaVector = usc_InDmaReg(info, DIVR);
1704 if ( debug_level >= DEBUG_LEVEL_ISR )
1705 printk("%s(%d):%s UscVector=%08X DmaVector=%08X\n",
1706 __FILE__,__LINE__,info->device_name,UscVector,DmaVector);
1708 if ( !UscVector && !DmaVector )
1711 /* Dispatch interrupt vector */
1713 (*UscIsrTable[UscVector])(info);
1714 else if ( (DmaVector&(BIT10|BIT9)) == BIT10)
1715 mgsl_isr_transmit_dma(info);
1717 mgsl_isr_receive_dma(info);
1719 if ( info->isr_overflow ) {
1720 printk(KERN_ERR "%s(%d):%s isr overflow irq=%d\n",
1721 __FILE__, __LINE__, info->device_name, info->irq_level);
1722 usc_DisableMasterIrqBit(info);
1723 usc_DisableDmaInterrupts(info,DICR_MASTER);
1728 /* Request bottom half processing if there's something
1729 * for it to do and the bh is not already running
1732 if ( info->pending_bh && !info->bh_running && !info->bh_requested ) {
1733 if ( debug_level >= DEBUG_LEVEL_ISR )
1734 printk("%s(%d):%s queueing bh task.\n",
1735 __FILE__,__LINE__,info->device_name);
1736 schedule_work(&info->task);
1737 info->bh_requested = true;
1740 spin_unlock(&info->irq_spinlock);
1742 if ( debug_level >= DEBUG_LEVEL_ISR )
1743 printk(KERN_DEBUG "%s(%d):mgsl_interrupt(%d)exit.\n",
1744 __FILE__, __LINE__, info->irq_level);
1747 } /* end of mgsl_interrupt() */
1751 * Initialize and start device.
1753 * Arguments: info pointer to device instance data
1754 * Return Value: 0 if success, otherwise error code
1756 static int startup(struct mgsl_struct * info)
1760 if ( debug_level >= DEBUG_LEVEL_INFO )
1761 printk("%s(%d):mgsl_startup(%s)\n",__FILE__,__LINE__,info->device_name);
1763 if (info->port.flags & ASYNC_INITIALIZED)
1766 if (!info->xmit_buf) {
1767 /* allocate a page of memory for a transmit buffer */
1768 info->xmit_buf = (unsigned char *)get_zeroed_page(GFP_KERNEL);
1769 if (!info->xmit_buf) {
1770 printk(KERN_ERR"%s(%d):%s can't allocate transmit buffer\n",
1771 __FILE__,__LINE__,info->device_name);
1776 info->pending_bh = 0;
1778 memset(&info->icount, 0, sizeof(info->icount));
1780 setup_timer(&info->tx_timer, mgsl_tx_timeout, (unsigned long)info);
1782 /* Allocate and claim adapter resources */
1783 retval = mgsl_claim_resources(info);
1785 /* perform existence check and diagnostics */
1787 retval = mgsl_adapter_test(info);
1790 if (capable(CAP_SYS_ADMIN) && info->port.tty)
1791 set_bit(TTY_IO_ERROR, &info->port.tty->flags);
1792 mgsl_release_resources(info);
1796 /* program hardware for current parameters */
1797 mgsl_change_params(info);
1800 clear_bit(TTY_IO_ERROR, &info->port.tty->flags);
1802 info->port.flags |= ASYNC_INITIALIZED;
1806 } /* end of startup() */
1810 * Called by mgsl_close() and mgsl_hangup() to shutdown hardware
1812 * Arguments: info pointer to device instance data
1813 * Return Value: None
1815 static void shutdown(struct mgsl_struct * info)
1817 unsigned long flags;
1819 if (!(info->port.flags & ASYNC_INITIALIZED))
1822 if (debug_level >= DEBUG_LEVEL_INFO)
1823 printk("%s(%d):mgsl_shutdown(%s)\n",
1824 __FILE__,__LINE__, info->device_name );
1826 /* clear status wait queue because status changes */
1827 /* can't happen after shutting down the hardware */
1828 wake_up_interruptible(&info->status_event_wait_q);
1829 wake_up_interruptible(&info->event_wait_q);
1831 del_timer_sync(&info->tx_timer);
1833 if (info->xmit_buf) {
1834 free_page((unsigned long) info->xmit_buf);
1835 info->xmit_buf = NULL;
1838 spin_lock_irqsave(&info->irq_spinlock,flags);
1839 usc_DisableMasterIrqBit(info);
1840 usc_stop_receiver(info);
1841 usc_stop_transmitter(info);
1842 usc_DisableInterrupts(info,RECEIVE_DATA + RECEIVE_STATUS +
1843 TRANSMIT_DATA + TRANSMIT_STATUS + IO_PIN + MISC );
1844 usc_DisableDmaInterrupts(info,DICR_MASTER + DICR_TRANSMIT + DICR_RECEIVE);
1846 /* Disable DMAEN (Port 7, Bit 14) */
1847 /* This disconnects the DMA request signal from the ISA bus */
1848 /* on the ISA adapter. This has no effect for the PCI adapter */
1849 usc_OutReg(info, PCR, (u16)((usc_InReg(info, PCR) | BIT15) | BIT14));
1851 /* Disable INTEN (Port 6, Bit12) */
1852 /* This disconnects the IRQ request signal to the ISA bus */
1853 /* on the ISA adapter. This has no effect for the PCI adapter */
1854 usc_OutReg(info, PCR, (u16)((usc_InReg(info, PCR) | BIT13) | BIT12));
1856 if (!info->port.tty || info->port.tty->termios->c_cflag & HUPCL) {
1857 info->serial_signals &= ~(SerialSignal_DTR + SerialSignal_RTS);
1858 usc_set_serial_signals(info);
1861 spin_unlock_irqrestore(&info->irq_spinlock,flags);
1863 mgsl_release_resources(info);
1866 set_bit(TTY_IO_ERROR, &info->port.tty->flags);
1868 info->port.flags &= ~ASYNC_INITIALIZED;
1870 } /* end of shutdown() */
1872 static void mgsl_program_hw(struct mgsl_struct *info)
1874 unsigned long flags;
1876 spin_lock_irqsave(&info->irq_spinlock,flags);
1878 usc_stop_receiver(info);
1879 usc_stop_transmitter(info);
1880 info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
1882 if (info->params.mode == MGSL_MODE_HDLC ||
1883 info->params.mode == MGSL_MODE_RAW ||
1885 usc_set_sync_mode(info);
1887 usc_set_async_mode(info);
1889 usc_set_serial_signals(info);
1891 info->dcd_chkcount = 0;
1892 info->cts_chkcount = 0;
1893 info->ri_chkcount = 0;
1894 info->dsr_chkcount = 0;
1896 usc_EnableStatusIrqs(info,SICR_CTS+SICR_DSR+SICR_DCD+SICR_RI);
1897 usc_EnableInterrupts(info, IO_PIN);
1898 usc_get_serial_signals(info);
1900 if (info->netcount || info->port.tty->termios->c_cflag & CREAD)
1901 usc_start_receiver(info);
1903 spin_unlock_irqrestore(&info->irq_spinlock,flags);
1906 /* Reconfigure adapter based on new parameters
1908 static void mgsl_change_params(struct mgsl_struct *info)
1913 if (!info->port.tty || !info->port.tty->termios)
1916 if (debug_level >= DEBUG_LEVEL_INFO)
1917 printk("%s(%d):mgsl_change_params(%s)\n",
1918 __FILE__,__LINE__, info->device_name );
1920 cflag = info->port.tty->termios->c_cflag;
1922 /* if B0 rate (hangup) specified then negate DTR and RTS */
1923 /* otherwise assert DTR and RTS */
1925 info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
1927 info->serial_signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
1929 /* byte size and parity */
1931 switch (cflag & CSIZE) {
1932 case CS5: info->params.data_bits = 5; break;
1933 case CS6: info->params.data_bits = 6; break;
1934 case CS7: info->params.data_bits = 7; break;
1935 case CS8: info->params.data_bits = 8; break;
1936 /* Never happens, but GCC is too dumb to figure it out */
1937 default: info->params.data_bits = 7; break;
1941 info->params.stop_bits = 2;
1943 info->params.stop_bits = 1;
1945 info->params.parity = ASYNC_PARITY_NONE;
1946 if (cflag & PARENB) {
1948 info->params.parity = ASYNC_PARITY_ODD;
1950 info->params.parity = ASYNC_PARITY_EVEN;
1953 info->params.parity = ASYNC_PARITY_SPACE;
1957 /* calculate number of jiffies to transmit a full
1958 * FIFO (32 bytes) at specified data rate
1960 bits_per_char = info->params.data_bits +
1961 info->params.stop_bits + 1;
1963 /* if port data rate is set to 460800 or less then
1964 * allow tty settings to override, otherwise keep the
1965 * current data rate.
1967 if (info->params.data_rate <= 460800)
1968 info->params.data_rate = tty_get_baud_rate(info->port.tty);
1970 if ( info->params.data_rate ) {
1971 info->timeout = (32*HZ*bits_per_char) /
1972 info->params.data_rate;
1974 info->timeout += HZ/50; /* Add .02 seconds of slop */
1976 if (cflag & CRTSCTS)
1977 info->port.flags |= ASYNC_CTS_FLOW;
1979 info->port.flags &= ~ASYNC_CTS_FLOW;
1982 info->port.flags &= ~ASYNC_CHECK_CD;
1984 info->port.flags |= ASYNC_CHECK_CD;
1986 /* process tty input control flags */
1988 info->read_status_mask = RXSTATUS_OVERRUN;
1989 if (I_INPCK(info->port.tty))
1990 info->read_status_mask |= RXSTATUS_PARITY_ERROR | RXSTATUS_FRAMING_ERROR;
1991 if (I_BRKINT(info->port.tty) || I_PARMRK(info->port.tty))
1992 info->read_status_mask |= RXSTATUS_BREAK_RECEIVED;
1994 if (I_IGNPAR(info->port.tty))
1995 info->ignore_status_mask |= RXSTATUS_PARITY_ERROR | RXSTATUS_FRAMING_ERROR;
1996 if (I_IGNBRK(info->port.tty)) {
1997 info->ignore_status_mask |= RXSTATUS_BREAK_RECEIVED;
1998 /* If ignoring parity and break indicators, ignore
1999 * overruns too. (For real raw support).
2001 if (I_IGNPAR(info->port.tty))
2002 info->ignore_status_mask |= RXSTATUS_OVERRUN;
2005 mgsl_program_hw(info);
2007 } /* end of mgsl_change_params() */
2011 * Add a character to the transmit buffer.
2013 * Arguments: tty pointer to tty information structure
2014 * ch character to add to transmit buffer
2016 * Return Value: None
2018 static int mgsl_put_char(struct tty_struct *tty, unsigned char ch)
2020 struct mgsl_struct *info = tty->driver_data;
2021 unsigned long flags;
2024 if (debug_level >= DEBUG_LEVEL_INFO) {
2025 printk(KERN_DEBUG "%s(%d):mgsl_put_char(%d) on %s\n",
2026 __FILE__, __LINE__, ch, info->device_name);
2029 if (mgsl_paranoia_check(info, tty->name, "mgsl_put_char"))
2032 if (!tty || !info->xmit_buf)
2035 spin_lock_irqsave(&info->irq_spinlock, flags);
2037 if ((info->params.mode == MGSL_MODE_ASYNC ) || !info->tx_active) {
2038 if (info->xmit_cnt < SERIAL_XMIT_SIZE - 1) {
2039 info->xmit_buf[info->xmit_head++] = ch;
2040 info->xmit_head &= SERIAL_XMIT_SIZE-1;
2045 spin_unlock_irqrestore(&info->irq_spinlock, flags);
2048 } /* end of mgsl_put_char() */
2050 /* mgsl_flush_chars()
2052 * Enable transmitter so remaining characters in the
2053 * transmit buffer are sent.
2055 * Arguments: tty pointer to tty information structure
2056 * Return Value: None
2058 static void mgsl_flush_chars(struct tty_struct *tty)
2060 struct mgsl_struct *info = tty->driver_data;
2061 unsigned long flags;
2063 if ( debug_level >= DEBUG_LEVEL_INFO )
2064 printk( "%s(%d):mgsl_flush_chars() entry on %s xmit_cnt=%d\n",
2065 __FILE__,__LINE__,info->device_name,info->xmit_cnt);
2067 if (mgsl_paranoia_check(info, tty->name, "mgsl_flush_chars"))
2070 if (info->xmit_cnt <= 0 || tty->stopped || tty->hw_stopped ||
2074 if ( debug_level >= DEBUG_LEVEL_INFO )
2075 printk( "%s(%d):mgsl_flush_chars() entry on %s starting transmitter\n",
2076 __FILE__,__LINE__,info->device_name );
2078 spin_lock_irqsave(&info->irq_spinlock,flags);
2080 if (!info->tx_active) {
2081 if ( (info->params.mode == MGSL_MODE_HDLC ||
2082 info->params.mode == MGSL_MODE_RAW) && info->xmit_cnt ) {
2083 /* operating in synchronous (frame oriented) mode */
2084 /* copy data from circular xmit_buf to */
2085 /* transmit DMA buffer. */
2086 mgsl_load_tx_dma_buffer(info,
2087 info->xmit_buf,info->xmit_cnt);
2089 usc_start_transmitter(info);
2092 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2094 } /* end of mgsl_flush_chars() */
2098 * Send a block of data
2102 * tty pointer to tty information structure
2103 * buf pointer to buffer containing send data
2104 * count size of send data in bytes
2106 * Return Value: number of characters written
2108 static int mgsl_write(struct tty_struct * tty,
2109 const unsigned char *buf, int count)
2112 struct mgsl_struct *info = tty->driver_data;
2113 unsigned long flags;
2115 if ( debug_level >= DEBUG_LEVEL_INFO )
2116 printk( "%s(%d):mgsl_write(%s) count=%d\n",
2117 __FILE__,__LINE__,info->device_name,count);
2119 if (mgsl_paranoia_check(info, tty->name, "mgsl_write"))
2122 if (!tty || !info->xmit_buf)
2125 if ( info->params.mode == MGSL_MODE_HDLC ||
2126 info->params.mode == MGSL_MODE_RAW ) {
2127 /* operating in synchronous (frame oriented) mode */
2128 /* operating in synchronous (frame oriented) mode */
2129 if (info->tx_active) {
2131 if ( info->params.mode == MGSL_MODE_HDLC ) {
2135 /* transmitter is actively sending data -
2136 * if we have multiple transmit dma and
2137 * holding buffers, attempt to queue this
2138 * frame for transmission at a later time.
2140 if (info->tx_holding_count >= info->num_tx_holding_buffers ) {
2141 /* no tx holding buffers available */
2146 /* queue transmit frame request */
2148 save_tx_buffer_request(info,buf,count);
2150 /* if we have sufficient tx dma buffers,
2151 * load the next buffered tx request
2153 spin_lock_irqsave(&info->irq_spinlock,flags);
2154 load_next_tx_holding_buffer(info);
2155 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2159 /* if operating in HDLC LoopMode and the adapter */
2160 /* has yet to be inserted into the loop, we can't */
2163 if ( (info->params.flags & HDLC_FLAG_HDLC_LOOPMODE) &&
2164 !usc_loopmode_active(info) )
2170 if ( info->xmit_cnt ) {
2171 /* Send accumulated from send_char() calls */
2172 /* as frame and wait before accepting more data. */
2175 /* copy data from circular xmit_buf to */
2176 /* transmit DMA buffer. */
2177 mgsl_load_tx_dma_buffer(info,
2178 info->xmit_buf,info->xmit_cnt);
2179 if ( debug_level >= DEBUG_LEVEL_INFO )
2180 printk( "%s(%d):mgsl_write(%s) sync xmit_cnt flushing\n",
2181 __FILE__,__LINE__,info->device_name);
2183 if ( debug_level >= DEBUG_LEVEL_INFO )
2184 printk( "%s(%d):mgsl_write(%s) sync transmit accepted\n",
2185 __FILE__,__LINE__,info->device_name);
2187 info->xmit_cnt = count;
2188 mgsl_load_tx_dma_buffer(info,buf,count);
2192 spin_lock_irqsave(&info->irq_spinlock,flags);
2193 c = min_t(int, count,
2194 min(SERIAL_XMIT_SIZE - info->xmit_cnt - 1,
2195 SERIAL_XMIT_SIZE - info->xmit_head));
2197 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2200 memcpy(info->xmit_buf + info->xmit_head, buf, c);
2201 info->xmit_head = ((info->xmit_head + c) &
2202 (SERIAL_XMIT_SIZE-1));
2203 info->xmit_cnt += c;
2204 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2211 if (info->xmit_cnt && !tty->stopped && !tty->hw_stopped) {
2212 spin_lock_irqsave(&info->irq_spinlock,flags);
2213 if (!info->tx_active)
2214 usc_start_transmitter(info);
2215 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2218 if ( debug_level >= DEBUG_LEVEL_INFO )
2219 printk( "%s(%d):mgsl_write(%s) returning=%d\n",
2220 __FILE__,__LINE__,info->device_name,ret);
2224 } /* end of mgsl_write() */
2226 /* mgsl_write_room()
2228 * Return the count of free bytes in transmit buffer
2230 * Arguments: tty pointer to tty info structure
2231 * Return Value: None
2233 static int mgsl_write_room(struct tty_struct *tty)
2235 struct mgsl_struct *info = tty->driver_data;
2238 if (mgsl_paranoia_check(info, tty->name, "mgsl_write_room"))
2240 ret = SERIAL_XMIT_SIZE - info->xmit_cnt - 1;
2244 if (debug_level >= DEBUG_LEVEL_INFO)
2245 printk("%s(%d):mgsl_write_room(%s)=%d\n",
2246 __FILE__,__LINE__, info->device_name,ret );
2248 if ( info->params.mode == MGSL_MODE_HDLC ||
2249 info->params.mode == MGSL_MODE_RAW ) {
2250 /* operating in synchronous (frame oriented) mode */
2251 if ( info->tx_active )
2254 return HDLC_MAX_FRAME_SIZE;
2259 } /* end of mgsl_write_room() */
2261 /* mgsl_chars_in_buffer()
2263 * Return the count of bytes in transmit buffer
2265 * Arguments: tty pointer to tty info structure
2266 * Return Value: None
2268 static int mgsl_chars_in_buffer(struct tty_struct *tty)
2270 struct mgsl_struct *info = tty->driver_data;
2272 if (debug_level >= DEBUG_LEVEL_INFO)
2273 printk("%s(%d):mgsl_chars_in_buffer(%s)\n",
2274 __FILE__,__LINE__, info->device_name );
2276 if (mgsl_paranoia_check(info, tty->name, "mgsl_chars_in_buffer"))
2279 if (debug_level >= DEBUG_LEVEL_INFO)
2280 printk("%s(%d):mgsl_chars_in_buffer(%s)=%d\n",
2281 __FILE__,__LINE__, info->device_name,info->xmit_cnt );
2283 if ( info->params.mode == MGSL_MODE_HDLC ||
2284 info->params.mode == MGSL_MODE_RAW ) {
2285 /* operating in synchronous (frame oriented) mode */
2286 if ( info->tx_active )
2287 return info->max_frame_size;
2292 return info->xmit_cnt;
2293 } /* end of mgsl_chars_in_buffer() */
2295 /* mgsl_flush_buffer()
2297 * Discard all data in the send buffer
2299 * Arguments: tty pointer to tty info structure
2300 * Return Value: None
2302 static void mgsl_flush_buffer(struct tty_struct *tty)
2304 struct mgsl_struct *info = tty->driver_data;
2305 unsigned long flags;
2307 if (debug_level >= DEBUG_LEVEL_INFO)
2308 printk("%s(%d):mgsl_flush_buffer(%s) entry\n",
2309 __FILE__,__LINE__, info->device_name );
2311 if (mgsl_paranoia_check(info, tty->name, "mgsl_flush_buffer"))
2314 spin_lock_irqsave(&info->irq_spinlock,flags);
2315 info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
2316 del_timer(&info->tx_timer);
2317 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2322 /* mgsl_send_xchar()
2324 * Send a high-priority XON/XOFF character
2326 * Arguments: tty pointer to tty info structure
2327 * ch character to send
2328 * Return Value: None
2330 static void mgsl_send_xchar(struct tty_struct *tty, char ch)
2332 struct mgsl_struct *info = tty->driver_data;
2333 unsigned long flags;
2335 if (debug_level >= DEBUG_LEVEL_INFO)
2336 printk("%s(%d):mgsl_send_xchar(%s,%d)\n",
2337 __FILE__,__LINE__, info->device_name, ch );
2339 if (mgsl_paranoia_check(info, tty->name, "mgsl_send_xchar"))
2344 /* Make sure transmit interrupts are on */
2345 spin_lock_irqsave(&info->irq_spinlock,flags);
2346 if (!info->tx_enabled)
2347 usc_start_transmitter(info);
2348 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2350 } /* end of mgsl_send_xchar() */
2354 * Signal remote device to throttle send data (our receive data)
2356 * Arguments: tty pointer to tty info structure
2357 * Return Value: None
2359 static void mgsl_throttle(struct tty_struct * tty)
2361 struct mgsl_struct *info = tty->driver_data;
2362 unsigned long flags;
2364 if (debug_level >= DEBUG_LEVEL_INFO)
2365 printk("%s(%d):mgsl_throttle(%s) entry\n",
2366 __FILE__,__LINE__, info->device_name );
2368 if (mgsl_paranoia_check(info, tty->name, "mgsl_throttle"))
2372 mgsl_send_xchar(tty, STOP_CHAR(tty));
2374 if (tty->termios->c_cflag & CRTSCTS) {
2375 spin_lock_irqsave(&info->irq_spinlock,flags);
2376 info->serial_signals &= ~SerialSignal_RTS;
2377 usc_set_serial_signals(info);
2378 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2380 } /* end of mgsl_throttle() */
2382 /* mgsl_unthrottle()
2384 * Signal remote device to stop throttling send data (our receive data)
2386 * Arguments: tty pointer to tty info structure
2387 * Return Value: None
2389 static void mgsl_unthrottle(struct tty_struct * tty)
2391 struct mgsl_struct *info = tty->driver_data;
2392 unsigned long flags;
2394 if (debug_level >= DEBUG_LEVEL_INFO)
2395 printk("%s(%d):mgsl_unthrottle(%s) entry\n",
2396 __FILE__,__LINE__, info->device_name );
2398 if (mgsl_paranoia_check(info, tty->name, "mgsl_unthrottle"))
2405 mgsl_send_xchar(tty, START_CHAR(tty));
2408 if (tty->termios->c_cflag & CRTSCTS) {
2409 spin_lock_irqsave(&info->irq_spinlock,flags);
2410 info->serial_signals |= SerialSignal_RTS;
2411 usc_set_serial_signals(info);
2412 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2415 } /* end of mgsl_unthrottle() */
2419 * get the current serial parameters information
2421 * Arguments: info pointer to device instance data
2422 * user_icount pointer to buffer to hold returned stats
2424 * Return Value: 0 if success, otherwise error code
2426 static int mgsl_get_stats(struct mgsl_struct * info, struct mgsl_icount __user *user_icount)
2430 if (debug_level >= DEBUG_LEVEL_INFO)
2431 printk("%s(%d):mgsl_get_params(%s)\n",
2432 __FILE__,__LINE__, info->device_name);
2435 memset(&info->icount, 0, sizeof(info->icount));
2437 COPY_TO_USER(err, user_icount, &info->icount, sizeof(struct mgsl_icount));
2444 } /* end of mgsl_get_stats() */
2446 /* mgsl_get_params()
2448 * get the current serial parameters information
2450 * Arguments: info pointer to device instance data
2451 * user_params pointer to buffer to hold returned params
2453 * Return Value: 0 if success, otherwise error code
2455 static int mgsl_get_params(struct mgsl_struct * info, MGSL_PARAMS __user *user_params)
2458 if (debug_level >= DEBUG_LEVEL_INFO)
2459 printk("%s(%d):mgsl_get_params(%s)\n",
2460 __FILE__,__LINE__, info->device_name);
2462 COPY_TO_USER(err,user_params, &info->params, sizeof(MGSL_PARAMS));
2464 if ( debug_level >= DEBUG_LEVEL_INFO )
2465 printk( "%s(%d):mgsl_get_params(%s) user buffer copy failed\n",
2466 __FILE__,__LINE__,info->device_name);
2472 } /* end of mgsl_get_params() */
2474 /* mgsl_set_params()
2476 * set the serial parameters
2480 * info pointer to device instance data
2481 * new_params user buffer containing new serial params
2483 * Return Value: 0 if success, otherwise error code
2485 static int mgsl_set_params(struct mgsl_struct * info, MGSL_PARAMS __user *new_params)
2487 unsigned long flags;
2488 MGSL_PARAMS tmp_params;
2491 if (debug_level >= DEBUG_LEVEL_INFO)
2492 printk("%s(%d):mgsl_set_params %s\n", __FILE__,__LINE__,
2493 info->device_name );
2494 COPY_FROM_USER(err,&tmp_params, new_params, sizeof(MGSL_PARAMS));
2496 if ( debug_level >= DEBUG_LEVEL_INFO )
2497 printk( "%s(%d):mgsl_set_params(%s) user buffer copy failed\n",
2498 __FILE__,__LINE__,info->device_name);
2502 spin_lock_irqsave(&info->irq_spinlock,flags);
2503 memcpy(&info->params,&tmp_params,sizeof(MGSL_PARAMS));
2504 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2506 mgsl_change_params(info);
2510 } /* end of mgsl_set_params() */
2512 /* mgsl_get_txidle()
2514 * get the current transmit idle mode
2516 * Arguments: info pointer to device instance data
2517 * idle_mode pointer to buffer to hold returned idle mode
2519 * Return Value: 0 if success, otherwise error code
2521 static int mgsl_get_txidle(struct mgsl_struct * info, int __user *idle_mode)
2525 if (debug_level >= DEBUG_LEVEL_INFO)
2526 printk("%s(%d):mgsl_get_txidle(%s)=%d\n",
2527 __FILE__,__LINE__, info->device_name, info->idle_mode);
2529 COPY_TO_USER(err,idle_mode, &info->idle_mode, sizeof(int));
2531 if ( debug_level >= DEBUG_LEVEL_INFO )
2532 printk( "%s(%d):mgsl_get_txidle(%s) user buffer copy failed\n",
2533 __FILE__,__LINE__,info->device_name);
2539 } /* end of mgsl_get_txidle() */
2541 /* mgsl_set_txidle() service ioctl to set transmit idle mode
2543 * Arguments: info pointer to device instance data
2544 * idle_mode new idle mode
2546 * Return Value: 0 if success, otherwise error code
2548 static int mgsl_set_txidle(struct mgsl_struct * info, int idle_mode)
2550 unsigned long flags;
2552 if (debug_level >= DEBUG_LEVEL_INFO)
2553 printk("%s(%d):mgsl_set_txidle(%s,%d)\n", __FILE__,__LINE__,
2554 info->device_name, idle_mode );
2556 spin_lock_irqsave(&info->irq_spinlock,flags);
2557 info->idle_mode = idle_mode;
2558 usc_set_txidle( info );
2559 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2562 } /* end of mgsl_set_txidle() */
2566 * enable or disable the transmitter
2570 * info pointer to device instance data
2571 * enable 1 = enable, 0 = disable
2573 * Return Value: 0 if success, otherwise error code
2575 static int mgsl_txenable(struct mgsl_struct * info, int enable)
2577 unsigned long flags;
2579 if (debug_level >= DEBUG_LEVEL_INFO)
2580 printk("%s(%d):mgsl_txenable(%s,%d)\n", __FILE__,__LINE__,
2581 info->device_name, enable);
2583 spin_lock_irqsave(&info->irq_spinlock,flags);
2585 if ( !info->tx_enabled ) {
2587 usc_start_transmitter(info);
2588 /*--------------------------------------------------
2589 * if HDLC/SDLC Loop mode, attempt to insert the
2590 * station in the 'loop' by setting CMR:13. Upon
2591 * receipt of the next GoAhead (RxAbort) sequence,
2592 * the OnLoop indicator (CCSR:7) should go active
2593 * to indicate that we are on the loop
2594 *--------------------------------------------------*/
2595 if ( info->params.flags & HDLC_FLAG_HDLC_LOOPMODE )
2596 usc_loopmode_insert_request( info );
2599 if ( info->tx_enabled )
2600 usc_stop_transmitter(info);
2602 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2605 } /* end of mgsl_txenable() */
2607 /* mgsl_txabort() abort send HDLC frame
2609 * Arguments: info pointer to device instance data
2610 * Return Value: 0 if success, otherwise error code
2612 static int mgsl_txabort(struct mgsl_struct * info)
2614 unsigned long flags;
2616 if (debug_level >= DEBUG_LEVEL_INFO)
2617 printk("%s(%d):mgsl_txabort(%s)\n", __FILE__,__LINE__,
2620 spin_lock_irqsave(&info->irq_spinlock,flags);
2621 if ( info->tx_active && info->params.mode == MGSL_MODE_HDLC )
2623 if ( info->params.flags & HDLC_FLAG_HDLC_LOOPMODE )
2624 usc_loopmode_cancel_transmit( info );
2626 usc_TCmd(info,TCmd_SendAbort);
2628 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2631 } /* end of mgsl_txabort() */
2633 /* mgsl_rxenable() enable or disable the receiver
2635 * Arguments: info pointer to device instance data
2636 * enable 1 = enable, 0 = disable
2637 * Return Value: 0 if success, otherwise error code
2639 static int mgsl_rxenable(struct mgsl_struct * info, int enable)
2641 unsigned long flags;
2643 if (debug_level >= DEBUG_LEVEL_INFO)
2644 printk("%s(%d):mgsl_rxenable(%s,%d)\n", __FILE__,__LINE__,
2645 info->device_name, enable);
2647 spin_lock_irqsave(&info->irq_spinlock,flags);
2649 if ( !info->rx_enabled )
2650 usc_start_receiver(info);
2652 if ( info->rx_enabled )
2653 usc_stop_receiver(info);
2655 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2658 } /* end of mgsl_rxenable() */
2660 /* mgsl_wait_event() wait for specified event to occur
2662 * Arguments: info pointer to device instance data
2663 * mask pointer to bitmask of events to wait for
2664 * Return Value: 0 if successful and bit mask updated with
2665 * of events triggerred,
2666 * otherwise error code
2668 static int mgsl_wait_event(struct mgsl_struct * info, int __user * mask_ptr)
2670 unsigned long flags;
2673 struct mgsl_icount cprev, cnow;
2676 struct _input_signal_events oldsigs, newsigs;
2677 DECLARE_WAITQUEUE(wait, current);
2679 COPY_FROM_USER(rc,&mask, mask_ptr, sizeof(int));
2684 if (debug_level >= DEBUG_LEVEL_INFO)
2685 printk("%s(%d):mgsl_wait_event(%s,%d)\n", __FILE__,__LINE__,
2686 info->device_name, mask);
2688 spin_lock_irqsave(&info->irq_spinlock,flags);
2690 /* return immediately if state matches requested events */
2691 usc_get_serial_signals(info);
2692 s = info->serial_signals;
2694 ( ((s & SerialSignal_DSR) ? MgslEvent_DsrActive:MgslEvent_DsrInactive) +
2695 ((s & SerialSignal_DCD) ? MgslEvent_DcdActive:MgslEvent_DcdInactive) +
2696 ((s & SerialSignal_CTS) ? MgslEvent_CtsActive:MgslEvent_CtsInactive) +
2697 ((s & SerialSignal_RI) ? MgslEvent_RiActive :MgslEvent_RiInactive) );
2699 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2703 /* save current irq counts */
2704 cprev = info->icount;
2705 oldsigs = info->input_signal_events;
2707 /* enable hunt and idle irqs if needed */
2708 if (mask & (MgslEvent_ExitHuntMode + MgslEvent_IdleReceived)) {
2709 u16 oldreg = usc_InReg(info,RICR);
2710 u16 newreg = oldreg +
2711 (mask & MgslEvent_ExitHuntMode ? RXSTATUS_EXITED_HUNT:0) +
2712 (mask & MgslEvent_IdleReceived ? RXSTATUS_IDLE_RECEIVED:0);
2713 if (oldreg != newreg)
2714 usc_OutReg(info, RICR, newreg);
2717 set_current_state(TASK_INTERRUPTIBLE);
2718 add_wait_queue(&info->event_wait_q, &wait);
2720 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2725 if (signal_pending(current)) {
2730 /* get current irq counts */
2731 spin_lock_irqsave(&info->irq_spinlock,flags);
2732 cnow = info->icount;
2733 newsigs = info->input_signal_events;
2734 set_current_state(TASK_INTERRUPTIBLE);
2735 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2737 /* if no change, wait aborted for some reason */
2738 if (newsigs.dsr_up == oldsigs.dsr_up &&
2739 newsigs.dsr_down == oldsigs.dsr_down &&
2740 newsigs.dcd_up == oldsigs.dcd_up &&
2741 newsigs.dcd_down == oldsigs.dcd_down &&
2742 newsigs.cts_up == oldsigs.cts_up &&
2743 newsigs.cts_down == oldsigs.cts_down &&
2744 newsigs.ri_up == oldsigs.ri_up &&
2745 newsigs.ri_down == oldsigs.ri_down &&
2746 cnow.exithunt == cprev.exithunt &&
2747 cnow.rxidle == cprev.rxidle) {
2753 ( (newsigs.dsr_up != oldsigs.dsr_up ? MgslEvent_DsrActive:0) +
2754 (newsigs.dsr_down != oldsigs.dsr_down ? MgslEvent_DsrInactive:0) +
2755 (newsigs.dcd_up != oldsigs.dcd_up ? MgslEvent_DcdActive:0) +
2756 (newsigs.dcd_down != oldsigs.dcd_down ? MgslEvent_DcdInactive:0) +
2757 (newsigs.cts_up != oldsigs.cts_up ? MgslEvent_CtsActive:0) +
2758 (newsigs.cts_down != oldsigs.cts_down ? MgslEvent_CtsInactive:0) +
2759 (newsigs.ri_up != oldsigs.ri_up ? MgslEvent_RiActive:0) +
2760 (newsigs.ri_down != oldsigs.ri_down ? MgslEvent_RiInactive:0) +
2761 (cnow.exithunt != cprev.exithunt ? MgslEvent_ExitHuntMode:0) +
2762 (cnow.rxidle != cprev.rxidle ? MgslEvent_IdleReceived:0) );
2770 remove_wait_queue(&info->event_wait_q, &wait);
2771 set_current_state(TASK_RUNNING);
2773 if (mask & (MgslEvent_ExitHuntMode + MgslEvent_IdleReceived)) {
2774 spin_lock_irqsave(&info->irq_spinlock,flags);
2775 if (!waitqueue_active(&info->event_wait_q)) {
2776 /* disable enable exit hunt mode/idle rcvd IRQs */
2777 usc_OutReg(info, RICR, usc_InReg(info,RICR) &
2778 ~(RXSTATUS_EXITED_HUNT + RXSTATUS_IDLE_RECEIVED));
2780 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2784 PUT_USER(rc, events, mask_ptr);
2788 } /* end of mgsl_wait_event() */
2790 static int modem_input_wait(struct mgsl_struct *info,int arg)
2792 unsigned long flags;
2794 struct mgsl_icount cprev, cnow;
2795 DECLARE_WAITQUEUE(wait, current);
2797 /* save current irq counts */
2798 spin_lock_irqsave(&info->irq_spinlock,flags);
2799 cprev = info->icount;
2800 add_wait_queue(&info->status_event_wait_q, &wait);
2801 set_current_state(TASK_INTERRUPTIBLE);
2802 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2806 if (signal_pending(current)) {
2811 /* get new irq counts */
2812 spin_lock_irqsave(&info->irq_spinlock,flags);
2813 cnow = info->icount;
2814 set_current_state(TASK_INTERRUPTIBLE);
2815 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2817 /* if no change, wait aborted for some reason */
2818 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
2819 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) {
2824 /* check for change in caller specified modem input */
2825 if ((arg & TIOCM_RNG && cnow.rng != cprev.rng) ||
2826 (arg & TIOCM_DSR && cnow.dsr != cprev.dsr) ||
2827 (arg & TIOCM_CD && cnow.dcd != cprev.dcd) ||
2828 (arg & TIOCM_CTS && cnow.cts != cprev.cts)) {
2835 remove_wait_queue(&info->status_event_wait_q, &wait);
2836 set_current_state(TASK_RUNNING);
2840 /* return the state of the serial control and status signals
2842 static int tiocmget(struct tty_struct *tty, struct file *file)
2844 struct mgsl_struct *info = tty->driver_data;
2845 unsigned int result;
2846 unsigned long flags;
2848 spin_lock_irqsave(&info->irq_spinlock,flags);
2849 usc_get_serial_signals(info);
2850 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2852 result = ((info->serial_signals & SerialSignal_RTS) ? TIOCM_RTS:0) +
2853 ((info->serial_signals & SerialSignal_DTR) ? TIOCM_DTR:0) +
2854 ((info->serial_signals & SerialSignal_DCD) ? TIOCM_CAR:0) +
2855 ((info->serial_signals & SerialSignal_RI) ? TIOCM_RNG:0) +
2856 ((info->serial_signals & SerialSignal_DSR) ? TIOCM_DSR:0) +
2857 ((info->serial_signals & SerialSignal_CTS) ? TIOCM_CTS:0);
2859 if (debug_level >= DEBUG_LEVEL_INFO)
2860 printk("%s(%d):%s tiocmget() value=%08X\n",
2861 __FILE__,__LINE__, info->device_name, result );
2865 /* set modem control signals (DTR/RTS)
2867 static int tiocmset(struct tty_struct *tty, struct file *file,
2868 unsigned int set, unsigned int clear)
2870 struct mgsl_struct *info = tty->driver_data;
2871 unsigned long flags;
2873 if (debug_level >= DEBUG_LEVEL_INFO)
2874 printk("%s(%d):%s tiocmset(%x,%x)\n",
2875 __FILE__,__LINE__,info->device_name, set, clear);
2877 if (set & TIOCM_RTS)
2878 info->serial_signals |= SerialSignal_RTS;
2879 if (set & TIOCM_DTR)
2880 info->serial_signals |= SerialSignal_DTR;
2881 if (clear & TIOCM_RTS)
2882 info->serial_signals &= ~SerialSignal_RTS;
2883 if (clear & TIOCM_DTR)
2884 info->serial_signals &= ~SerialSignal_DTR;
2886 spin_lock_irqsave(&info->irq_spinlock,flags);
2887 usc_set_serial_signals(info);
2888 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2893 /* mgsl_break() Set or clear transmit break condition
2895 * Arguments: tty pointer to tty instance data
2896 * break_state -1=set break condition, 0=clear
2897 * Return Value: error code
2899 static int mgsl_break(struct tty_struct *tty, int break_state)
2901 struct mgsl_struct * info = tty->driver_data;
2902 unsigned long flags;
2904 if (debug_level >= DEBUG_LEVEL_INFO)
2905 printk("%s(%d):mgsl_break(%s,%d)\n",
2906 __FILE__,__LINE__, info->device_name, break_state);
2908 if (mgsl_paranoia_check(info, tty->name, "mgsl_break"))
2911 spin_lock_irqsave(&info->irq_spinlock,flags);
2912 if (break_state == -1)
2913 usc_OutReg(info,IOCR,(u16)(usc_InReg(info,IOCR) | BIT7));
2915 usc_OutReg(info,IOCR,(u16)(usc_InReg(info,IOCR) & ~BIT7));
2916 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2919 } /* end of mgsl_break() */
2921 /* mgsl_ioctl() Service an IOCTL request
2925 * tty pointer to tty instance data
2926 * file pointer to associated file object for device
2927 * cmd IOCTL command code
2928 * arg command argument/context
2930 * Return Value: 0 if success, otherwise error code
2932 static int mgsl_ioctl(struct tty_struct *tty, struct file * file,
2933 unsigned int cmd, unsigned long arg)
2935 struct mgsl_struct * info = tty->driver_data;
2938 if (debug_level >= DEBUG_LEVEL_INFO)
2939 printk("%s(%d):mgsl_ioctl %s cmd=%08X\n", __FILE__,__LINE__,
2940 info->device_name, cmd );
2942 if (mgsl_paranoia_check(info, tty->name, "mgsl_ioctl"))
2945 if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
2946 (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
2947 if (tty->flags & (1 << TTY_IO_ERROR))
2952 ret = mgsl_ioctl_common(info, cmd, arg);
2957 static int mgsl_ioctl_common(struct mgsl_struct *info, unsigned int cmd, unsigned long arg)
2960 struct mgsl_icount cnow; /* kernel counter temps */
2961 void __user *argp = (void __user *)arg;
2962 struct serial_icounter_struct __user *p_cuser; /* user space */
2963 unsigned long flags;
2966 case MGSL_IOCGPARAMS:
2967 return mgsl_get_params(info, argp);
2968 case MGSL_IOCSPARAMS:
2969 return mgsl_set_params(info, argp);
2970 case MGSL_IOCGTXIDLE:
2971 return mgsl_get_txidle(info, argp);
2972 case MGSL_IOCSTXIDLE:
2973 return mgsl_set_txidle(info,(int)arg);
2974 case MGSL_IOCTXENABLE:
2975 return mgsl_txenable(info,(int)arg);
2976 case MGSL_IOCRXENABLE:
2977 return mgsl_rxenable(info,(int)arg);
2978 case MGSL_IOCTXABORT:
2979 return mgsl_txabort(info);
2980 case MGSL_IOCGSTATS:
2981 return mgsl_get_stats(info, argp);
2982 case MGSL_IOCWAITEVENT:
2983 return mgsl_wait_event(info, argp);
2984 case MGSL_IOCLOOPTXDONE:
2985 return mgsl_loopmode_send_done(info);
2986 /* Wait for modem input (DCD,RI,DSR,CTS) change
2987 * as specified by mask in arg (TIOCM_RNG/DSR/CD/CTS)
2990 return modem_input_wait(info,(int)arg);
2993 * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
2994 * Return: write counters to the user passed counter struct
2995 * NB: both 1->0 and 0->1 transitions are counted except for
2996 * RI where only 0->1 is counted.
2999 spin_lock_irqsave(&info->irq_spinlock,flags);
3000 cnow = info->icount;
3001 spin_unlock_irqrestore(&info->irq_spinlock,flags);
3003 PUT_USER(error,cnow.cts, &p_cuser->cts);
3004 if (error) return error;
3005 PUT_USER(error,cnow.dsr, &p_cuser->dsr);
3006 if (error) return error;
3007 PUT_USER(error,cnow.rng, &p_cuser->rng);
3008 if (error) return error;
3009 PUT_USER(error,cnow.dcd, &p_cuser->dcd);
3010 if (error) return error;
3011 PUT_USER(error,cnow.rx, &p_cuser->rx);
3012 if (error) return error;
3013 PUT_USER(error,cnow.tx, &p_cuser->tx);
3014 if (error) return error;
3015 PUT_USER(error,cnow.frame, &p_cuser->frame);
3016 if (error) return error;
3017 PUT_USER(error,cnow.overrun, &p_cuser->overrun);
3018 if (error) return error;
3019 PUT_USER(error,cnow.parity, &p_cuser->parity);
3020 if (error) return error;
3021 PUT_USER(error,cnow.brk, &p_cuser->brk);
3022 if (error) return error;
3023 PUT_USER(error,cnow.buf_overrun, &p_cuser->buf_overrun);
3024 if (error) return error;
3027 return -ENOIOCTLCMD;
3032 /* mgsl_set_termios()
3034 * Set new termios settings
3038 * tty pointer to tty structure
3039 * termios pointer to buffer to hold returned old termios
3041 * Return Value: None
3043 static void mgsl_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
3045 struct mgsl_struct *info = tty->driver_data;
3046 unsigned long flags;
3048 if (debug_level >= DEBUG_LEVEL_INFO)
3049 printk("%s(%d):mgsl_set_termios %s\n", __FILE__,__LINE__,
3050 tty->driver->name );
3052 mgsl_change_params(info);
3054 /* Handle transition to B0 status */
3055 if (old_termios->c_cflag & CBAUD &&
3056 !(tty->termios->c_cflag & CBAUD)) {
3057 info->serial_signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
3058 spin_lock_irqsave(&info->irq_spinlock,flags);
3059 usc_set_serial_signals(info);
3060 spin_unlock_irqrestore(&info->irq_spinlock,flags);
3063 /* Handle transition away from B0 status */
3064 if (!(old_termios->c_cflag & CBAUD) &&
3065 tty->termios->c_cflag & CBAUD) {
3066 info->serial_signals |= SerialSignal_DTR;
3067 if (!(tty->termios->c_cflag & CRTSCTS) ||
3068 !test_bit(TTY_THROTTLED, &tty->flags)) {
3069 info->serial_signals |= SerialSignal_RTS;
3071 spin_lock_irqsave(&info->irq_spinlock,flags);
3072 usc_set_serial_signals(info);
3073 spin_unlock_irqrestore(&info->irq_spinlock,flags);
3076 /* Handle turning off CRTSCTS */
3077 if (old_termios->c_cflag & CRTSCTS &&
3078 !(tty->termios->c_cflag & CRTSCTS)) {
3079 tty->hw_stopped = 0;
3083 } /* end of mgsl_set_termios() */
3087 * Called when port is closed. Wait for remaining data to be
3088 * sent. Disable port and free resources.
3092 * tty pointer to open tty structure
3093 * filp pointer to open file object
3095 * Return Value: None
3097 static void mgsl_close(struct tty_struct *tty, struct file * filp)
3099 struct mgsl_struct * info = tty->driver_data;
3101 if (mgsl_paranoia_check(info, tty->name, "mgsl_close"))
3104 if (debug_level >= DEBUG_LEVEL_INFO)
3105 printk("%s(%d):mgsl_close(%s) entry, count=%d\n",
3106 __FILE__,__LINE__, info->device_name, info->port.count);
3108 if (tty_port_close_start(&info->port, tty, filp) == 0)
3111 if (info->port.flags & ASYNC_INITIALIZED)
3112 mgsl_wait_until_sent(tty, info->timeout);
3113 mgsl_flush_buffer(tty);
3114 tty_ldisc_flush(tty);
3117 tty_port_close_end(&info->port, tty);
3118 info->port.tty = NULL;
3120 if (debug_level >= DEBUG_LEVEL_INFO)
3121 printk("%s(%d):mgsl_close(%s) exit, count=%d\n", __FILE__,__LINE__,
3122 tty->driver->name, info->port.count);
3124 } /* end of mgsl_close() */
3126 /* mgsl_wait_until_sent()
3128 * Wait until the transmitter is empty.
3132 * tty pointer to tty info structure
3133 * timeout time to wait for send completion
3135 * Return Value: None
3137 static void mgsl_wait_until_sent(struct tty_struct *tty, int timeout)
3139 struct mgsl_struct * info = tty->driver_data;
3140 unsigned long orig_jiffies, char_time;
3145 if (debug_level >= DEBUG_LEVEL_INFO)
3146 printk("%s(%d):mgsl_wait_until_sent(%s) entry\n",
3147 __FILE__,__LINE__, info->device_name );
3149 if (mgsl_paranoia_check(info, tty->name, "mgsl_wait_until_sent"))
3152 if (!(info->port.flags & ASYNC_INITIALIZED))
3155 orig_jiffies = jiffies;
3157 /* Set check interval to 1/5 of estimated time to
3158 * send a character, and make it at least 1. The check
3159 * interval should also be less than the timeout.
3160 * Note: use tight timings here to satisfy the NIST-PCTS.
3164 if ( info->params.data_rate ) {
3165 char_time = info->timeout/(32 * 5);
3172 char_time = min_t(unsigned long, char_time, timeout);
3174 if ( info->params.mode == MGSL_MODE_HDLC ||
3175 info->params.mode == MGSL_MODE_RAW ) {
3176 while (info->tx_active) {
3177 msleep_interruptible(jiffies_to_msecs(char_time));
3178 if (signal_pending(current))
3180 if (timeout && time_after(jiffies, orig_jiffies + timeout))
3184 while (!(usc_InReg(info,TCSR) & TXSTATUS_ALL_SENT) &&
3186 msleep_interruptible(jiffies_to_msecs(char_time));
3187 if (signal_pending(current))
3189 if (timeout && time_after(jiffies, orig_jiffies + timeout))
3196 if (debug_level >= DEBUG_LEVEL_INFO)
3197 printk("%s(%d):mgsl_wait_until_sent(%s) exit\n",
3198 __FILE__,__LINE__, info->device_name );
3200 } /* end of mgsl_wait_until_sent() */
3204 * Called by tty_hangup() when a hangup is signaled.
3205 * This is the same as to closing all open files for the port.
3207 * Arguments: tty pointer to associated tty object
3208 * Return Value: None
3210 static void mgsl_hangup(struct tty_struct *tty)
3212 struct mgsl_struct * info = tty->driver_data;
3214 if (debug_level >= DEBUG_LEVEL_INFO)
3215 printk("%s(%d):mgsl_hangup(%s)\n",
3216 __FILE__,__LINE__, info->device_name );
3218 if (mgsl_paranoia_check(info, tty->name, "mgsl_hangup"))
3221 mgsl_flush_buffer(tty);
3224 info->port.count = 0;
3225 info->port.flags &= ~ASYNC_NORMAL_ACTIVE;
3226 info->port.tty = NULL;
3228 wake_up_interruptible(&info->port.open_wait);
3230 } /* end of mgsl_hangup() */
3235 * Return true if carrier is raised
3238 static int carrier_raised(struct tty_port *port)
3240 unsigned long flags;
3241 struct mgsl_struct *info = container_of(port, struct mgsl_struct, port);
3243 spin_lock_irqsave(&info->irq_spinlock, flags);
3244 usc_get_serial_signals(info);
3245 spin_unlock_irqrestore(&info->irq_spinlock, flags);
3246 return (info->serial_signals & SerialSignal_DCD) ? 1 : 0;
3249 static void raise_dtr_rts(struct tty_port *port)
3251 struct mgsl_struct *info = container_of(port, struct mgsl_struct, port);
3252 unsigned long flags;
3254 spin_lock_irqsave(&info->irq_spinlock,flags);
3255 info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
3256 usc_set_serial_signals(info);
3257 spin_unlock_irqrestore(&info->irq_spinlock,flags);
3261 /* block_til_ready()
3263 * Block the current process until the specified port
3264 * is ready to be opened.
3268 * tty pointer to tty info structure
3269 * filp pointer to open file object
3270 * info pointer to device instance data
3272 * Return Value: 0 if success, otherwise error code
3274 static int block_til_ready(struct tty_struct *tty, struct file * filp,
3275 struct mgsl_struct *info)
3277 DECLARE_WAITQUEUE(wait, current);
3279 bool do_clocal = false;
3280 bool extra_count = false;
3281 unsigned long flags;
3283 struct tty_port *port = &info->port;
3285 if (debug_level >= DEBUG_LEVEL_INFO)
3286 printk("%s(%d):block_til_ready on %s\n",
3287 __FILE__,__LINE__, tty->driver->name );
3289 if (filp->f_flags & O_NONBLOCK || tty->flags & (1 << TTY_IO_ERROR)){
3290 /* nonblock mode is set or port is not enabled */
3291 port->flags |= ASYNC_NORMAL_ACTIVE;
3295 if (tty->termios->c_cflag & CLOCAL)
3298 /* Wait for carrier detect and the line to become
3299 * free (i.e., not in use by the callout). While we are in
3300 * this loop, port->count is dropped by one, so that
3301 * mgsl_close() knows when to free things. We restore it upon
3302 * exit, either normal or abnormal.
3306 add_wait_queue(&port->open_wait, &wait);
3308 if (debug_level >= DEBUG_LEVEL_INFO)
3309 printk("%s(%d):block_til_ready before block on %s count=%d\n",
3310 __FILE__,__LINE__, tty->driver->name, port->count );
3312 spin_lock_irqsave(&info->irq_spinlock, flags);
3313 if (!tty_hung_up_p(filp)) {
3317 spin_unlock_irqrestore(&info->irq_spinlock, flags);
3318 port->blocked_open++;
3321 if (tty->termios->c_cflag & CBAUD)
3322 tty_port_raise_dtr_rts(port);
3324 set_current_state(TASK_INTERRUPTIBLE);
3326 if (tty_hung_up_p(filp) || !(port->flags & ASYNC_INITIALIZED)){
3327 retval = (port->flags & ASYNC_HUP_NOTIFY) ?
3328 -EAGAIN : -ERESTARTSYS;
3332 dcd = tty_port_carrier_raised(&info->port);
3334 if (!(port->flags & ASYNC_CLOSING) && (do_clocal || dcd))
3337 if (signal_pending(current)) {
3338 retval = -ERESTARTSYS;
3342 if (debug_level >= DEBUG_LEVEL_INFO)
3343 printk("%s(%d):block_til_ready blocking on %s count=%d\n",
3344 __FILE__,__LINE__, tty->driver->name, port->count );
3349 set_current_state(TASK_RUNNING);
3350 remove_wait_queue(&port->open_wait, &wait);
3352 /* FIXME: Racy on hangup during close wait */
3355 port->blocked_open--;
3357 if (debug_level >= DEBUG_LEVEL_INFO)
3358 printk("%s(%d):block_til_ready after blocking on %s count=%d\n",
3359 __FILE__,__LINE__, tty->driver->name, port->count );
3362 port->flags |= ASYNC_NORMAL_ACTIVE;
3366 } /* end of block_til_ready() */
3370 * Called when a port is opened. Init and enable port.
3371 * Perform serial-specific initialization for the tty structure.
3373 * Arguments: tty pointer to tty info structure
3374 * filp associated file pointer
3376 * Return Value: 0 if success, otherwise error code
3378 static int mgsl_open(struct tty_struct *tty, struct file * filp)
3380 struct mgsl_struct *info;
3382 unsigned long flags;
3384 /* verify range of specified line number */
3386 if ((line < 0) || (line >= mgsl_device_count)) {
3387 printk("%s(%d):mgsl_open with invalid line #%d.\n",
3388 __FILE__,__LINE__,line);
3392 /* find the info structure for the specified line */
3393 info = mgsl_device_list;
3394 while(info && info->line != line)
3395 info = info->next_device;
3396 if (mgsl_paranoia_check(info, tty->name, "mgsl_open"))
3399 tty->driver_data = info;
3400 info->port.tty = tty;
3402 if (debug_level >= DEBUG_LEVEL_INFO)
3403 printk("%s(%d):mgsl_open(%s), old ref count = %d\n",
3404 __FILE__,__LINE__,tty->driver->name, info->port.count);
3406 /* If port is closing, signal caller to try again */
3407 if (tty_hung_up_p(filp) || info->port.flags & ASYNC_CLOSING){
3408 if (info->port.flags & ASYNC_CLOSING)
3409 interruptible_sleep_on(&info->port.close_wait);
3410 retval = ((info->port.flags & ASYNC_HUP_NOTIFY) ?
3411 -EAGAIN : -ERESTARTSYS);
3415 info->port.tty->low_latency = (info->port.flags & ASYNC_LOW_LATENCY) ? 1 : 0;
3417 spin_lock_irqsave(&info->netlock, flags);
3418 if (info->netcount) {
3420 spin_unlock_irqrestore(&info->netlock, flags);
3424 spin_unlock_irqrestore(&info->netlock, flags);
3426 if (info->port.count == 1) {
3427 /* 1st open on this device, init hardware */
3428 retval = startup(info);
3433 retval = block_til_ready(tty, filp, info);
3435 if (debug_level >= DEBUG_LEVEL_INFO)
3436 printk("%s(%d):block_til_ready(%s) returned %d\n",
3437 __FILE__,__LINE__, info->device_name, retval);
3441 if (debug_level >= DEBUG_LEVEL_INFO)
3442 printk("%s(%d):mgsl_open(%s) success\n",
3443 __FILE__,__LINE__, info->device_name);
3448 if (tty->count == 1)
3449 info->port.tty = NULL; /* tty layer will release tty struct */
3450 if(info->port.count)
3456 } /* end of mgsl_open() */
3459 * /proc fs routines....
3462 static inline int line_info(char *buf, struct mgsl_struct *info)
3466 unsigned long flags;
3468 if (info->bus_type == MGSL_BUS_TYPE_PCI) {
3469 ret = sprintf(buf, "%s:PCI io:%04X irq:%d mem:%08X lcr:%08X",
3470 info->device_name, info->io_base, info->irq_level,
3471 info->phys_memory_base, info->phys_lcr_base);
3473 ret = sprintf(buf, "%s:(E)ISA io:%04X irq:%d dma:%d",
3474 info->device_name, info->io_base,
3475 info->irq_level, info->dma_level);
3478 /* output current serial signal states */
3479 spin_lock_irqsave(&info->irq_spinlock,flags);
3480 usc_get_serial_signals(info);
3481 spin_unlock_irqrestore(&info->irq_spinlock,flags);
3485 if (info->serial_signals & SerialSignal_RTS)
3486 strcat(stat_buf, "|RTS");
3487 if (info->serial_signals & SerialSignal_CTS)
3488 strcat(stat_buf, "|CTS");
3489 if (info->serial_signals & SerialSignal_DTR)
3490 strcat(stat_buf, "|DTR");
3491 if (info->serial_signals & SerialSignal_DSR)
3492 strcat(stat_buf, "|DSR");
3493 if (info->serial_signals & SerialSignal_DCD)
3494 strcat(stat_buf, "|CD");
3495 if (info->serial_signals & SerialSignal_RI)
3496 strcat(stat_buf, "|RI");
3498 if (info->params.mode == MGSL_MODE_HDLC ||
3499 info->params.mode == MGSL_MODE_RAW ) {
3500 ret += sprintf(buf+ret, " HDLC txok:%d rxok:%d",
3501 info->icount.txok, info->icount.rxok);
3502 if (info->icount.txunder)
3503 ret += sprintf(buf+ret, " txunder:%d", info->icount.txunder);
3504 if (info->icount.txabort)
3505 ret += sprintf(buf+ret, " txabort:%d", info->icount.txabort);
3506 if (info->icount.rxshort)
3507 ret += sprintf(buf+ret, " rxshort:%d", info->icount.rxshort);
3508 if (info->icount.rxlong)
3509 ret += sprintf(buf+ret, " rxlong:%d", info->icount.rxlong);
3510 if (info->icount.rxover)
3511 ret += sprintf(buf+ret, " rxover:%d", info->icount.rxover);
3512 if (info->icount.rxcrc)
3513 ret += sprintf(buf+ret, " rxcrc:%d", info->icount.rxcrc);
3515 ret += sprintf(buf+ret, " ASYNC tx:%d rx:%d",
3516 info->icount.tx, info->icount.rx);
3517 if (info->icount.frame)
3518 ret += sprintf(buf+ret, " fe:%d", info->icount.frame);
3519 if (info->icount.parity)
3520 ret += sprintf(buf+ret, " pe:%d", info->icount.parity);
3521 if (info->icount.brk)
3522 ret += sprintf(buf+ret, " brk:%d", info->icount.brk);
3523 if (info->icount.overrun)
3524 ret += sprintf(buf+ret, " oe:%d", info->icount.overrun);
3527 /* Append serial signal status to end */
3528 ret += sprintf(buf+ret, " %s\n", stat_buf+1);
3530 ret += sprintf(buf+ret, "txactive=%d bh_req=%d bh_run=%d pending_bh=%x\n",
3531 info->tx_active,info->bh_requested,info->bh_running,
3534 spin_lock_irqsave(&info->irq_spinlock,flags);
3536 u16 Tcsr = usc_InReg( info, TCSR );
3537 u16 Tdmr = usc_InDmaReg( info, TDMR );
3538 u16 Ticr = usc_InReg( info, TICR );
3539 u16 Rscr = usc_InReg( info, RCSR );
3540 u16 Rdmr = usc_InDmaReg( info, RDMR );
3541 u16 Ricr = usc_InReg( info, RICR );
3542 u16 Icr = usc_InReg( info, ICR );
3543 u16 Dccr = usc_InReg( info, DCCR );
3544 u16 Tmr = usc_InReg( info, TMR );
3545 u16 Tccr = usc_InReg( info, TCCR );
3546 u16 Ccar = inw( info->io_base + CCAR );
3547 ret += sprintf(buf+ret, "tcsr=%04X tdmr=%04X ticr=%04X rcsr=%04X rdmr=%04X\n"
3548 "ricr=%04X icr =%04X dccr=%04X tmr=%04X tccr=%04X ccar=%04X\n",
3549 Tcsr,Tdmr,Ticr,Rscr,Rdmr,Ricr,Icr,Dccr,Tmr,Tccr,Ccar );
3551 spin_unlock_irqrestore(&info->irq_spinlock,flags);
3555 } /* end of line_info() */
3559 * Called to print information about devices
3562 * page page of memory to hold returned info
3571 static int mgsl_read_proc(char *page, char **start, off_t off, int count,
3572 int *eof, void *data)
3576 struct mgsl_struct *info;
3578 len += sprintf(page, "synclink driver:%s\n", driver_version);
3580 info = mgsl_device_list;
3582 l = line_info(page + len, info);
3584 if (len+begin > off+count)
3586 if (len+begin < off) {
3590 info = info->next_device;
3595 if (off >= len+begin)
3597 *start = page + (off-begin);
3598 return ((count < begin+len-off) ? count : begin+len-off);
3600 } /* end of mgsl_read_proc() */
3602 /* mgsl_allocate_dma_buffers()
3604 * Allocate and format DMA buffers (ISA adapter)
3605 * or format shared memory buffers (PCI adapter).
3607 * Arguments: info pointer to device instance data
3608 * Return Value: 0 if success, otherwise error
3610 static int mgsl_allocate_dma_buffers(struct mgsl_struct *info)
3612 unsigned short BuffersPerFrame;
3614 info->last_mem_alloc = 0;
3616 /* Calculate the number of DMA buffers necessary to hold the */
3617 /* largest allowable frame size. Note: If the max frame size is */
3618 /* not an even multiple of the DMA buffer size then we need to */
3619 /* round the buffer count per frame up one. */
3621 BuffersPerFrame = (unsigned short)(info->max_frame_size/DMABUFFERSIZE);
3622 if ( info->max_frame_size % DMABUFFERSIZE )
3625 if ( info->bus_type == MGSL_BUS_TYPE_PCI ) {
3627 * The PCI adapter has 256KBytes of shared memory to use.
3628 * This is 64 PAGE_SIZE buffers.
3630 * The first page is used for padding at this time so the
3631 * buffer list does not begin at offset 0 of the PCI
3632 * adapter's shared memory.
3634 * The 2nd page is used for the buffer list. A 4K buffer
3635 * list can hold 128 DMA_BUFFER structures at 32 bytes
3638 * This leaves 62 4K pages.
3640 * The next N pages are used for transmit frame(s). We
3641 * reserve enough 4K page blocks to hold the required
3642 * number of transmit dma buffers (num_tx_dma_buffers),
3643 * each of MaxFrameSize size.
3645 * Of the remaining pages (62-N), determine how many can
3646 * be used to receive full MaxFrameSize inbound frames
3648 info->tx_buffer_count = info->num_tx_dma_buffers * BuffersPerFrame;
3649 info->rx_buffer_count = 62 - info->tx_buffer_count;
3651 /* Calculate the number of PAGE_SIZE buffers needed for */
3652 /* receive and transmit DMA buffers. */
3655 /* Calculate the number of DMA buffers necessary to */
3656 /* hold 7 max size receive frames and one max size transmit frame. */
3657 /* The receive buffer count is bumped by one so we avoid an */
3658 /* End of List condition if all receive buffers are used when */
3659 /* using linked list DMA buffers. */
3661 info->tx_buffer_count = info->num_tx_dma_buffers * BuffersPerFrame;
3662 info->rx_buffer_count = (BuffersPerFrame * MAXRXFRAMES) + 6;
3665 * limit total TxBuffers & RxBuffers to 62 4K total
3666 * (ala PCI Allocation)
3669 if ( (info->tx_buffer_count + info->rx_buffer_count) > 62 )
3670 info->rx_buffer_count = 62 - info->tx_buffer_count;
3674 if ( debug_level >= DEBUG_LEVEL_INFO )
3675 printk("%s(%d):Allocating %d TX and %d RX DMA buffers.\n",
3676 __FILE__,__LINE__, info->tx_buffer_count,info->rx_buffer_count);
3678 if ( mgsl_alloc_buffer_list_memory( info ) < 0 ||
3679 mgsl_alloc_frame_memory(info, info->rx_buffer_list, info->rx_buffer_count) < 0 ||
3680 mgsl_alloc_frame_memory(info, info->tx_buffer_list, info->tx_buffer_count) < 0 ||
3681 mgsl_alloc_intermediate_rxbuffer_memory(info) < 0 ||
3682 mgsl_alloc_intermediate_txbuffer_memory(info) < 0 ) {
3683 printk("%s(%d):Can't allocate DMA buffer memory\n",__FILE__,__LINE__);
3687 mgsl_reset_rx_dma_buffers( info );
3688 mgsl_reset_tx_dma_buffers( info );
3692 } /* end of mgsl_allocate_dma_buffers() */
3695 * mgsl_alloc_buffer_list_memory()
3697 * Allocate a common DMA buffer for use as the
3698 * receive and transmit buffer lists.
3700 * A buffer list is a set of buffer entries where each entry contains
3701 * a pointer to an actual buffer and a pointer to the next buffer entry
3702 * (plus some other info about the buffer).
3704 * The buffer entries for a list are built to form a circular list so
3705 * that when the entire list has been traversed you start back at the
3708 * This function allocates memory for just the buffer entries.
3709 * The links (pointer to next entry) are filled in with the physical
3710 * address of the next entry so the adapter can navigate the list
3711 * using bus master DMA. The pointers to the actual buffers are filled
3712 * out later when the actual buffers are allocated.
3714 * Arguments: info pointer to device instance data
3715 * Return Value: 0 if success, otherwise error
3717 static int mgsl_alloc_buffer_list_memory( struct mgsl_struct *info )
3721 if ( info->bus_type == MGSL_BUS_TYPE_PCI ) {
3722 /* PCI adapter uses shared memory. */
3723 info->buffer_list = info->memory_base + info->last_mem_alloc;
3724 info->buffer_list_phys = info->last_mem_alloc;
3725 info->last_mem_alloc += BUFFERLISTSIZE;
3727 /* ISA adapter uses system memory. */
3728 /* The buffer lists are allocated as a common buffer that both */
3729 /* the processor and adapter can access. This allows the driver to */
3730 /* inspect portions of the buffer while other portions are being */
3731 /* updated by the adapter using Bus Master DMA. */
3733 info->buffer_list = dma_alloc_coherent(NULL, BUFFERLISTSIZE, &info->buffer_list_dma_addr, GFP_KERNEL);
3734 if (info->buffer_list == NULL)
3736 info->buffer_list_phys = (u32)(info->buffer_list_dma_addr);
3739 /* We got the memory for the buffer entry lists. */
3740 /* Initialize the memory block to all zeros. */
3741 memset( info->buffer_list, 0, BUFFERLISTSIZE );
3743 /* Save virtual address pointers to the receive and */
3744 /* transmit buffer lists. (Receive 1st). These pointers will */
3745 /* be used by the processor to access the lists. */
3746 info->rx_buffer_list = (DMABUFFERENTRY *)info->buffer_list;
3747 info->tx_buffer_list = (DMABUFFERENTRY *)info->buffer_list;
3748 info->tx_buffer_list += info->rx_buffer_count;
3751 * Build the links for the buffer entry lists such that
3752 * two circular lists are built. (Transmit and Receive).
3754 * Note: the links are physical addresses
3755 * which are read by the adapter to determine the next
3756 * buffer entry to use.
3759 for ( i = 0; i < info->rx_buffer_count; i++ ) {
3760 /* calculate and store physical address of this buffer entry */
3761 info->rx_buffer_list[i].phys_entry =
3762 info->buffer_list_phys + (i * sizeof(DMABUFFERENTRY));
3764 /* calculate and store physical address of */
3765 /* next entry in cirular list of entries */
3767 info->rx_buffer_list[i].link = info->buffer_list_phys;
3769 if ( i < info->rx_buffer_count - 1 )
3770 info->rx_buffer_list[i].link += (i + 1) * sizeof(DMABUFFERENTRY);
3773 for ( i = 0; i < info->tx_buffer_count; i++ ) {
3774 /* calculate and store physical address of this buffer entry */
3775 info->tx_buffer_list[i].phys_entry = info->buffer_list_phys +
3776 ((info->rx_buffer_count + i) * sizeof(DMABUFFERENTRY));
3778 /* calculate and store physical address of */
3779 /* next entry in cirular list of entries */
3781 info->tx_buffer_list[i].link = info->buffer_list_phys +
3782 info->rx_buffer_count * sizeof(DMABUFFERENTRY);
3784 if ( i < info->tx_buffer_count - 1 )
3785 info->tx_buffer_list[i].link += (i + 1) * sizeof(DMABUFFERENTRY);
3790 } /* end of mgsl_alloc_buffer_list_memory() */
3792 /* Free DMA buffers allocated for use as the
3793 * receive and transmit buffer lists.
3796 * The data transfer buffers associated with the buffer list
3797 * MUST be freed before freeing the buffer list itself because
3798 * the buffer list contains the information necessary to free
3799 * the individual buffers!
3801 static void mgsl_free_buffer_list_memory( struct mgsl_struct *info )
3803 if (info->buffer_list && info->bus_type != MGSL_BUS_TYPE_PCI)
3804 dma_free_coherent(NULL, BUFFERLISTSIZE, info->buffer_list, info->buffer_list_dma_addr);
3806 info->buffer_list = NULL;
3807 info->rx_buffer_list = NULL;
3808 info->tx_buffer_list = NULL;
3810 } /* end of mgsl_free_buffer_list_memory() */
3813 * mgsl_alloc_frame_memory()
3815 * Allocate the frame DMA buffers used by the specified buffer list.
3816 * Each DMA buffer will be one memory page in size. This is necessary
3817 * because memory can fragment enough that it may be impossible
3822 * info pointer to device instance data
3823 * BufferList pointer to list of buffer entries
3824 * Buffercount count of buffer entries in buffer list
3826 * Return Value: 0 if success, otherwise -ENOMEM
3828 static int mgsl_alloc_frame_memory(struct mgsl_struct *info,DMABUFFERENTRY *BufferList,int Buffercount)
3833 /* Allocate page sized buffers for the receive buffer list */
3835 for ( i = 0; i < Buffercount; i++ ) {
3836 if ( info->bus_type == MGSL_BUS_TYPE_PCI ) {
3837 /* PCI adapter uses shared memory buffers. */
3838 BufferList[i].virt_addr = info->memory_base + info->last_mem_alloc;
3839 phys_addr = info->last_mem_alloc;
3840 info->last_mem_alloc += DMABUFFERSIZE;
3842 /* ISA adapter uses system memory. */
3843 BufferList[i].virt_addr = dma_alloc_coherent(NULL, DMABUFFERSIZE, &BufferList[i].dma_addr, GFP_KERNEL);
3844 if (BufferList[i].virt_addr == NULL)
3846 phys_addr = (u32)(BufferList[i].dma_addr);
3848 BufferList[i].phys_addr = phys_addr;
3853 } /* end of mgsl_alloc_frame_memory() */
3856 * mgsl_free_frame_memory()
3858 * Free the buffers associated with
3859 * each buffer entry of a buffer list.
3863 * info pointer to device instance data
3864 * BufferList pointer to list of buffer entries
3865 * Buffercount count of buffer entries in buffer list
3867 * Return Value: None
3869 static void mgsl_free_frame_memory(struct mgsl_struct *info, DMABUFFERENTRY *BufferList, int Buffercount)
3874 for ( i = 0 ; i < Buffercount ; i++ ) {
3875 if ( BufferList[i].virt_addr ) {
3876 if ( info->bus_type != MGSL_BUS_TYPE_PCI )
3877 dma_free_coherent(NULL, DMABUFFERSIZE, BufferList[i].virt_addr, BufferList[i].dma_addr);
3878 BufferList[i].virt_addr = NULL;
3883 } /* end of mgsl_free_frame_memory() */
3885 /* mgsl_free_dma_buffers()
3889 * Arguments: info pointer to device instance data
3890 * Return Value: None
3892 static void mgsl_free_dma_buffers( struct mgsl_struct *info )
3894 mgsl_free_frame_memory( info, info->rx_buffer_list, info->rx_buffer_count );
3895 mgsl_free_frame_memory( info, info->tx_buffer_list, info->tx_buffer_count );
3896 mgsl_free_buffer_list_memory( info );
3898 } /* end of mgsl_free_dma_buffers() */
3902 * mgsl_alloc_intermediate_rxbuffer_memory()
3904 * Allocate a buffer large enough to hold max_frame_size. This buffer
3905 * is used to pass an assembled frame to the line discipline.
3909 * info pointer to device instance data
3911 * Return Value: 0 if success, otherwise -ENOMEM
3913 static int mgsl_alloc_intermediate_rxbuffer_memory(struct mgsl_struct *info)
3915 info->intermediate_rxbuffer = kmalloc(info->max_frame_size, GFP_KERNEL | GFP_DMA);
3916 if ( info->intermediate_rxbuffer == NULL )
3921 } /* end of mgsl_alloc_intermediate_rxbuffer_memory() */
3924 * mgsl_free_intermediate_rxbuffer_memory()
3929 * info pointer to device instance data
3931 * Return Value: None
3933 static void mgsl_free_intermediate_rxbuffer_memory(struct mgsl_struct *info)
3935 kfree(info->intermediate_rxbuffer);
3936 info->intermediate_rxbuffer = NULL;
3938 } /* end of mgsl_free_intermediate_rxbuffer_memory() */
3941 * mgsl_alloc_intermediate_txbuffer_memory()
3943 * Allocate intermdiate transmit buffer(s) large enough to hold max_frame_size.
3944 * This buffer is used to load transmit frames into the adapter's dma transfer
3945 * buffers when there is sufficient space.
3949 * info pointer to device instance data
3951 * Return Value: 0 if success, otherwise -ENOMEM
3953 static int mgsl_alloc_intermediate_txbuffer_memory(struct mgsl_struct *info)
3957 if ( debug_level >= DEBUG_LEVEL_INFO )
3958 printk("%s %s(%d) allocating %d tx holding buffers\n",
3959 info->device_name, __FILE__,__LINE__,info->num_tx_holding_buffers);
3961 memset(info->tx_holding_buffers,0,sizeof(info->tx_holding_buffers));
3963 for ( i=0; i<info->num_tx_holding_buffers; ++i) {
3964 info->tx_holding_buffers[i].buffer =
3965 kmalloc(info->max_frame_size, GFP_KERNEL);
3966 if (info->tx_holding_buffers[i].buffer == NULL) {
3967 for (--i; i >= 0; i--) {
3968 kfree(info->tx_holding_buffers[i].buffer);
3969 info->tx_holding_buffers[i].buffer = NULL;
3977 } /* end of mgsl_alloc_intermediate_txbuffer_memory() */
3980 * mgsl_free_intermediate_txbuffer_memory()
3985 * info pointer to device instance data
3987 * Return Value: None
3989 static void mgsl_free_intermediate_txbuffer_memory(struct mgsl_struct *info)
3993 for ( i=0; i<info->num_tx_holding_buffers; ++i ) {
3994 kfree(info->tx_holding_buffers[i].buffer);
3995 info->tx_holding_buffers[i].buffer = NULL;
3998 info->get_tx_holding_index = 0;
3999 info->put_tx_holding_index = 0;
4000 info->tx_holding_count = 0;
4002 } /* end of mgsl_free_intermediate_txbuffer_memory() */
4006 * load_next_tx_holding_buffer()
4008 * attempts to load the next buffered tx request into the
4013 * info pointer to device instance data
4015 * Return Value: true if next buffered tx request loaded
4016 * into adapter's tx dma buffer,
4019 static bool load_next_tx_holding_buffer(struct mgsl_struct *info)
4023 if ( info->tx_holding_count ) {
4024 /* determine if we have enough tx dma buffers
4025 * to accommodate the next tx frame
4027 struct tx_holding_buffer *ptx =
4028 &info->tx_holding_buffers[info->get_tx_holding_index];
4029 int num_free = num_free_tx_dma_buffers(info);
4030 int num_needed = ptx->buffer_size / DMABUFFERSIZE;
4031 if ( ptx->buffer_size % DMABUFFERSIZE )
4034 if (num_needed <= num_free) {
4035 info->xmit_cnt = ptx->buffer_size;
4036 mgsl_load_tx_dma_buffer(info,ptx->buffer,ptx->buffer_size);
4038 --info->tx_holding_count;
4039 if ( ++info->get_tx_holding_index >= info->num_tx_holding_buffers)
4040 info->get_tx_holding_index=0;
4042 /* restart transmit timer */
4043 mod_timer(&info->tx_timer, jiffies + msecs_to_jiffies(5000));
4053 * save_tx_buffer_request()
4055 * attempt to store transmit frame request for later transmission
4059 * info pointer to device instance data
4060 * Buffer pointer to buffer containing frame to load
4061 * BufferSize size in bytes of frame in Buffer
4063 * Return Value: 1 if able to store, 0 otherwise
4065 static int save_tx_buffer_request(struct mgsl_struct *info,const char *Buffer, unsigned int BufferSize)
4067 struct tx_holding_buffer *ptx;
4069 if ( info->tx_holding_count >= info->num_tx_holding_buffers ) {
4070 return 0; /* all buffers in use */
4073 ptx = &info->tx_holding_buffers[info->put_tx_holding_index];
4074 ptx->buffer_size = BufferSize;
4075 memcpy( ptx->buffer, Buffer, BufferSize);
4077 ++info->tx_holding_count;
4078 if ( ++info->put_tx_holding_index >= info->num_tx_holding_buffers)
4079 info->put_tx_holding_index=0;
4084 static int mgsl_claim_resources(struct mgsl_struct *info)
4086 if (request_region(info->io_base,info->io_addr_size,"synclink") == NULL) {
4087 printk( "%s(%d):I/O address conflict on device %s Addr=%08X\n",
4088 __FILE__,__LINE__,info->device_name, info->io_base);
4091 info->io_addr_requested = true;
4093 if ( request_irq(info->irq_level,mgsl_interrupt,info->irq_flags,
4094 info->device_name, info ) < 0 ) {
4095 printk( "%s(%d):Cant request interrupt on device %s IRQ=%d\n",
4096 __FILE__,__LINE__,info->device_name, info->irq_level );
4099 info->irq_requested = true;
4101 if ( info->bus_type == MGSL_BUS_TYPE_PCI ) {
4102 if (request_mem_region(info->phys_memory_base,0x40000,"synclink") == NULL) {
4103 printk( "%s(%d):mem addr conflict device %s Addr=%08X\n",
4104 __FILE__,__LINE__,info->device_name, info->phys_memory_base);
4107 info->shared_mem_requested = true;
4108 if (request_mem_region(info->phys_lcr_base + info->lcr_offset,128,"synclink") == NULL) {
4109 printk( "%s(%d):lcr mem addr conflict device %s Addr=%08X\n",
4110 __FILE__,__LINE__,info->device_name, info->phys_lcr_base + info->lcr_offset);
4113 info->lcr_mem_requested = true;
4115 info->memory_base = ioremap_nocache(info->phys_memory_base,
4117 if (!info->memory_base) {
4118 printk( "%s(%d):Cant map shared memory on device %s MemAddr=%08X\n",
4119 __FILE__,__LINE__,info->device_name, info->phys_memory_base );
4123 if ( !mgsl_memory_test(info) ) {
4124 printk( "%s(%d):Failed shared memory test %s MemAddr=%08X\n",
4125 __FILE__,__LINE__,info->device_name, info->phys_memory_base );
4129 info->lcr_base = ioremap_nocache(info->phys_lcr_base,
4131 if (!info->lcr_base) {
4132 printk( "%s(%d):Cant map LCR memory on device %s MemAddr=%08X\n",
4133 __FILE__,__LINE__,info->device_name, info->phys_lcr_base );
4136 info->lcr_base += info->lcr_offset;
4139 /* claim DMA channel */
4141 if (request_dma(info->dma_level,info->device_name) < 0){
4142 printk( "%s(%d):Cant request DMA channel on device %s DMA=%d\n",
4143 __FILE__,__LINE__,info->device_name, info->dma_level );
4144 mgsl_release_resources( info );
4147 info->dma_requested = true;
4149 /* ISA adapter uses bus master DMA */
4150 set_dma_mode(info->dma_level,DMA_MODE_CASCADE);
4151 enable_dma(info->dma_level);
4154 if ( mgsl_allocate_dma_buffers(info) < 0 ) {
4155 printk( "%s(%d):Cant allocate DMA buffers on device %s DMA=%d\n",
4156 __FILE__,__LINE__,info->device_name, info->dma_level );
4162 mgsl_release_resources(info);
4165 } /* end of mgsl_claim_resources() */
4167 static void mgsl_release_resources(struct mgsl_struct *info)
4169 if ( debug_level >= DEBUG_LEVEL_INFO )
4170 printk( "%s(%d):mgsl_release_resources(%s) entry\n",
4171 __FILE__,__LINE__,info->device_name );
4173 if ( info->irq_requested ) {
4174 free_irq(info->irq_level, info);
4175 info->irq_requested = false;
4177 if ( info->dma_requested ) {
4178 disable_dma(info->dma_level);
4179 free_dma(info->dma_level);
4180 info->dma_requested = false;
4182 mgsl_free_dma_buffers(info);
4183 mgsl_free_intermediate_rxbuffer_memory(info);
4184 mgsl_free_intermediate_txbuffer_memory(info);
4186 if ( info->io_addr_requested ) {
4187 release_region(info->io_base,info->io_addr_size);
4188 info->io_addr_requested = false;
4190 if ( info->shared_mem_requested ) {
4191 release_mem_region(info->phys_memory_base,0x40000);
4192 info->shared_mem_requested = false;
4194 if ( info->lcr_mem_requested ) {
4195 release_mem_region(info->phys_lcr_base + info->lcr_offset,128);
4196 info->lcr_mem_requested = false;
4198 if (info->memory_base){
4199 iounmap(info->memory_base);
4200 info->memory_base = NULL;
4202 if (info->lcr_base){
4203 iounmap(info->lcr_base - info->lcr_offset);
4204 info->lcr_base = NULL;
4207 if ( debug_level >= DEBUG_LEVEL_INFO )
4208 printk( "%s(%d):mgsl_release_resources(%s) exit\n",
4209 __FILE__,__LINE__,info->device_name );
4211 } /* end of mgsl_release_resources() */
4213 /* mgsl_add_device()
4215 * Add the specified device instance data structure to the
4216 * global linked list of devices and increment the device count.
4218 * Arguments: info pointer to device instance data
4219 * Return Value: None
4221 static void mgsl_add_device( struct mgsl_struct *info )
4223 info->next_device = NULL;
4224 info->line = mgsl_device_count;
4225 sprintf(info->device_name,"ttySL%d",info->line);
4227 if (info->line < MAX_TOTAL_DEVICES) {
4228 if (maxframe[info->line])
4229 info->max_frame_size = maxframe[info->line];
4231 if (txdmabufs[info->line]) {
4232 info->num_tx_dma_buffers = txdmabufs[info->line];
4233 if (info->num_tx_dma_buffers < 1)
4234 info->num_tx_dma_buffers = 1;
4237 if (txholdbufs[info->line]) {
4238 info->num_tx_holding_buffers = txholdbufs[info->line];
4239 if (info->num_tx_holding_buffers < 1)
4240 info->num_tx_holding_buffers = 1;
4241 else if (info->num_tx_holding_buffers > MAX_TX_HOLDING_BUFFERS)
4242 info->num_tx_holding_buffers = MAX_TX_HOLDING_BUFFERS;
4246 mgsl_device_count++;
4248 if ( !mgsl_device_list )
4249 mgsl_device_list = info;
4251 struct mgsl_struct *current_dev = mgsl_device_list;
4252 while( current_dev->next_device )
4253 current_dev = current_dev->next_device;
4254 current_dev->next_device = info;
4257 if ( info->max_frame_size < 4096 )
4258 info->max_frame_size = 4096;
4259 else if ( info->max_frame_size > 65535 )
4260 info->max_frame_size = 65535;
4262 if ( info->bus_type == MGSL_BUS_TYPE_PCI ) {
4263 printk( "SyncLink PCI v%d %s: IO=%04X IRQ=%d Mem=%08X,%08X MaxFrameSize=%u\n",
4264 info->hw_version + 1, info->device_name, info->io_base, info->irq_level,
4265 info->phys_memory_base, info->phys_lcr_base,
4266 info->max_frame_size );
4268 printk( "SyncLink ISA %s: IO=%04X IRQ=%d DMA=%d MaxFrameSize=%u\n",
4269 info->device_name, info->io_base, info->irq_level, info->dma_level,
4270 info->max_frame_size );
4273 #if SYNCLINK_GENERIC_HDLC
4277 } /* end of mgsl_add_device() */
4279 static const struct tty_port_operations mgsl_port_ops = {
4280 .carrier_raised = carrier_raised,
4281 .raise_dtr_rts = raise_dtr_rts,
4285 /* mgsl_allocate_device()
4287 * Allocate and initialize a device instance structure
4290 * Return Value: pointer to mgsl_struct if success, otherwise NULL
4292 static struct mgsl_struct* mgsl_allocate_device(void)
4294 struct mgsl_struct *info;
4296 info = kzalloc(sizeof(struct mgsl_struct),
4300 printk("Error can't allocate device instance data\n");
4302 tty_port_init(&info->port);
4303 info->port.ops = &mgsl_port_ops;
4304 info->magic = MGSL_MAGIC;
4305 INIT_WORK(&info->task, mgsl_bh_handler);
4306 info->max_frame_size = 4096;
4307 info->port.close_delay = 5*HZ/10;
4308 info->port.closing_wait = 30*HZ;
4309 init_waitqueue_head(&info->status_event_wait_q);
4310 init_waitqueue_head(&info->event_wait_q);
4311 spin_lock_init(&info->irq_spinlock);
4312 spin_lock_init(&info->netlock);
4313 memcpy(&info->params,&default_params,sizeof(MGSL_PARAMS));
4314 info->idle_mode = HDLC_TXIDLE_FLAGS;
4315 info->num_tx_dma_buffers = 1;
4316 info->num_tx_holding_buffers = 0;
4321 } /* end of mgsl_allocate_device()*/
4323 static const struct tty_operations mgsl_ops = {
4325 .close = mgsl_close,
4326 .write = mgsl_write,
4327 .put_char = mgsl_put_char,
4328 .flush_chars = mgsl_flush_chars,
4329 .write_room = mgsl_write_room,
4330 .chars_in_buffer = mgsl_chars_in_buffer,
4331 .flush_buffer = mgsl_flush_buffer,
4332 .ioctl = mgsl_ioctl,
4333 .throttle = mgsl_throttle,
4334 .unthrottle = mgsl_unthrottle,
4335 .send_xchar = mgsl_send_xchar,
4336 .break_ctl = mgsl_break,
4337 .wait_until_sent = mgsl_wait_until_sent,
4338 .read_proc = mgsl_read_proc,
4339 .set_termios = mgsl_set_termios,
4341 .start = mgsl_start,
4342 .hangup = mgsl_hangup,
4343 .tiocmget = tiocmget,
4344 .tiocmset = tiocmset,
4348 * perform tty device initialization
4350 static int mgsl_init_tty(void)
4354 serial_driver = alloc_tty_driver(128);
4358 serial_driver->owner = THIS_MODULE;
4359 serial_driver->driver_name = "synclink";
4360 serial_driver->name = "ttySL";
4361 serial_driver->major = ttymajor;
4362 serial_driver->minor_start = 64;
4363 serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
4364 serial_driver->subtype = SERIAL_TYPE_NORMAL;
4365 serial_driver->init_termios = tty_std_termios;
4366 serial_driver->init_termios.c_cflag =
4367 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
4368 serial_driver->init_termios.c_ispeed = 9600;
4369 serial_driver->init_termios.c_ospeed = 9600;
4370 serial_driver->flags = TTY_DRIVER_REAL_RAW;
4371 tty_set_operations(serial_driver, &mgsl_ops);
4372 if ((rc = tty_register_driver(serial_driver)) < 0) {
4373 printk("%s(%d):Couldn't register serial driver\n",
4375 put_tty_driver(serial_driver);
4376 serial_driver = NULL;
4380 printk("%s %s, tty major#%d\n",
4381 driver_name, driver_version,
4382 serial_driver->major);
4386 /* enumerate user specified ISA adapters
4388 static void mgsl_enum_isa_devices(void)
4390 struct mgsl_struct *info;
4393 /* Check for user specified ISA devices */
4395 for (i=0 ;(i < MAX_ISA_DEVICES) && io[i] && irq[i]; i++){
4396 if ( debug_level >= DEBUG_LEVEL_INFO )
4397 printk("ISA device specified io=%04X,irq=%d,dma=%d\n",
4398 io[i], irq[i], dma[i] );
4400 info = mgsl_allocate_device();
4402 /* error allocating device instance data */
4403 if ( debug_level >= DEBUG_LEVEL_ERROR )
4404 printk( "can't allocate device instance data.\n");
4408 /* Copy user configuration info to device instance data */
4409 info->io_base = (unsigned int)io[i];
4410 info->irq_level = (unsigned int)irq[i];
4411 info->irq_level = irq_canonicalize(info->irq_level);
4412 info->dma_level = (unsigned int)dma[i];
4413 info->bus_type = MGSL_BUS_TYPE_ISA;
4414 info->io_addr_size = 16;
4415 info->irq_flags = 0;
4417 mgsl_add_device( info );
4421 static void synclink_cleanup(void)
4424 struct mgsl_struct *info;
4425 struct mgsl_struct *tmp;
4427 printk("Unloading %s: %s\n", driver_name, driver_version);
4429 if (serial_driver) {
4430 if ((rc = tty_unregister_driver(serial_driver)))
4431 printk("%s(%d) failed to unregister tty driver err=%d\n",
4432 __FILE__,__LINE__,rc);
4433 put_tty_driver(serial_driver);
4436 info = mgsl_device_list;
4438 #if SYNCLINK_GENERIC_HDLC
4441 mgsl_release_resources(info);
4443 info = info->next_device;
4448 pci_unregister_driver(&synclink_pci_driver);
4451 static int __init synclink_init(void)
4455 if (break_on_load) {
4456 mgsl_get_text_ptr();
4460 printk("%s %s\n", driver_name, driver_version);
4462 mgsl_enum_isa_devices();
4463 if ((rc = pci_register_driver(&synclink_pci_driver)) < 0)
4464 printk("%s:failed to register PCI driver, error=%d\n",__FILE__,rc);
4466 pci_registered = true;
4468 if ((rc = mgsl_init_tty()) < 0)
4478 static void __exit synclink_exit(void)
4483 module_init(synclink_init);
4484 module_exit(synclink_exit);
4489 * Issue a USC Receive/Transmit command to the
4490 * Channel Command/Address Register (CCAR).
4494 * The command is encoded in the most significant 5 bits <15..11>
4495 * of the CCAR value. Bits <10..7> of the CCAR must be preserved
4496 * and Bits <6..0> must be written as zeros.
4500 * info pointer to device information structure
4501 * Cmd command mask (use symbolic macros)
4507 static void usc_RTCmd( struct mgsl_struct *info, u16 Cmd )
4509 /* output command to CCAR in bits <15..11> */
4510 /* preserve bits <10..7>, bits <6..0> must be zero */
4512 outw( Cmd + info->loopback_bits, info->io_base + CCAR );
4514 /* Read to flush write to CCAR */
4515 if ( info->bus_type == MGSL_BUS_TYPE_PCI )
4516 inw( info->io_base + CCAR );
4518 } /* end of usc_RTCmd() */
4523 * Issue a DMA command to the DMA Command/Address Register (DCAR).
4527 * info pointer to device information structure
4528 * Cmd DMA command mask (usc_DmaCmd_XX Macros)
4534 static void usc_DmaCmd( struct mgsl_struct *info, u16 Cmd )
4536 /* write command mask to DCAR */
4537 outw( Cmd + info->mbre_bit, info->io_base );
4539 /* Read to flush write to DCAR */
4540 if ( info->bus_type == MGSL_BUS_TYPE_PCI )
4541 inw( info->io_base );
4543 } /* end of usc_DmaCmd() */
4548 * Write a 16-bit value to a USC DMA register
4552 * info pointer to device info structure
4553 * RegAddr register address (number) for write
4554 * RegValue 16-bit value to write to register
4561 static void usc_OutDmaReg( struct mgsl_struct *info, u16 RegAddr, u16 RegValue )
4563 /* Note: The DCAR is located at the adapter base address */
4564 /* Note: must preserve state of BIT8 in DCAR */
4566 outw( RegAddr + info->mbre_bit, info->io_base );
4567 outw( RegValue, info->io_base );
4569 /* Read to flush write to DCAR */
4570 if ( info->bus_type == MGSL_BUS_TYPE_PCI )
4571 inw( info->io_base );
4573 } /* end of usc_OutDmaReg() */
4578 * Read a 16-bit value from a DMA register
4582 * info pointer to device info structure
4583 * RegAddr register address (number) to read from
4587 * The 16-bit value read from register
4590 static u16 usc_InDmaReg( struct mgsl_struct *info, u16 RegAddr )
4592 /* Note: The DCAR is located at the adapter base address */
4593 /* Note: must preserve state of BIT8 in DCAR */
4595 outw( RegAddr + info->mbre_bit, info->io_base );
4596 return inw( info->io_base );
4598 } /* end of usc_InDmaReg() */
4604 * Write a 16-bit value to a USC serial channel register
4608 * info pointer to device info structure
4609 * RegAddr register address (number) to write to
4610 * RegValue 16-bit value to write to register
4617 static void usc_OutReg( struct mgsl_struct *info, u16 RegAddr, u16 RegValue )
4619 outw( RegAddr + info->loopback_bits, info->io_base + CCAR );
4620 outw( RegValue, info->io_base + CCAR );
4622 /* Read to flush write to CCAR */
4623 if ( info->bus_type == MGSL_BUS_TYPE_PCI )
4624 inw( info->io_base + CCAR );
4626 } /* end of usc_OutReg() */
4631 * Reads a 16-bit value from a USC serial channel register
4635 * info pointer to device extension
4636 * RegAddr register address (number) to read from
4640 * 16-bit value read from register
4642 static u16 usc_InReg( struct mgsl_struct *info, u16 RegAddr )
4644 outw( RegAddr + info->loopback_bits, info->io_base + CCAR );
4645 return inw( info->io_base + CCAR );
4647 } /* end of usc_InReg() */
4649 /* usc_set_sdlc_mode()
4651 * Set up the adapter for SDLC DMA communications.
4653 * Arguments: info pointer to device instance data
4654 * Return Value: NONE
4656 static void usc_set_sdlc_mode( struct mgsl_struct *info )
4662 * determine if the IUSC on the adapter is pre-SL1660. If
4663 * not, take advantage of the UnderWait feature of more
4664 * modern chips. If an underrun occurs and this bit is set,
4665 * the transmitter will idle the programmed idle pattern
4666 * until the driver has time to service the underrun. Otherwise,
4667 * the dma controller may get the cycles previously requested
4668 * and begin transmitting queued tx data.
4670 usc_OutReg(info,TMCR,0x1f);
4671 RegValue=usc_InReg(info,TMDR);
4672 PreSL1660 = (RegValue == IUSC_PRE_SL1660);
4674 if ( info->params.flags & HDLC_FLAG_HDLC_LOOPMODE )
4677 ** Channel Mode Register (CMR)
4679 ** <15..14> 10 Tx Sub Modes, Send Flag on Underrun
4680 ** <13> 0 0 = Transmit Disabled (initially)
4681 ** <12> 0 1 = Consecutive Idles share common 0
4682 ** <11..8> 1110 Transmitter Mode = HDLC/SDLC Loop
4683 ** <7..4> 0000 Rx Sub Modes, addr/ctrl field handling
4684 ** <3..0> 0110 Receiver Mode = HDLC/SDLC
4686 ** 1000 1110 0000 0110 = 0x8e06
4690 /*--------------------------------------------------
4691 * ignore user options for UnderRun Actions and
4693 *--------------------------------------------------*/
4697 /* Channel mode Register (CMR)
4699 * <15..14> 00 Tx Sub modes, Underrun Action
4700 * <13> 0 1 = Send Preamble before opening flag
4701 * <12> 0 1 = Consecutive Idles share common 0
4702 * <11..8> 0110 Transmitter mode = HDLC/SDLC
4703 * <7..4> 0000 Rx Sub modes, addr/ctrl field handling
4704 * <3..0> 0110 Receiver mode = HDLC/SDLC
4706 * 0000 0110 0000 0110 = 0x0606
4708 if (info->params.mode == MGSL_MODE_RAW) {
4709 RegValue = 0x0001; /* Set Receive mode = external sync */
4711 usc_OutReg( info, IOCR, /* Set IOCR DCD is RxSync Detect Input */
4712 (unsigned short)((usc_InReg(info, IOCR) & ~(BIT13|BIT12)) | BIT12));
4716 * CMR <15> 0 Don't send CRC on Tx Underrun
4717 * CMR <14> x undefined
4718 * CMR <13> 0 Send preamble before openning sync
4719 * CMR <12> 0 Send 8-bit syncs, 1=send Syncs per TxLength
4722 * CMR <11-8) 0100 MonoSync
4724 * 0x00 0100 xxxx xxxx 04xx
4732 if ( info->params.flags & HDLC_FLAG_UNDERRUN_ABORT15 )
4734 else if ( info->params.flags & HDLC_FLAG_UNDERRUN_FLAG )
4736 else if ( info->params.flags & HDLC_FLAG_UNDERRUN_CRC )
4737 RegValue |= BIT15 + BIT14;
4740 if ( info->params.preamble != HDLC_PREAMBLE_PATTERN_NONE )
4744 if ( info->params.mode == MGSL_MODE_HDLC &&
4745 (info->params.flags & HDLC_FLAG_SHARE_ZERO) )
4748 if ( info->params.addr_filter != 0xff )
4750 /* set up receive address filtering */
4751 usc_OutReg( info, RSR, info->params.addr_filter );
4755 usc_OutReg( info, CMR, RegValue );
4756 info->cmr_value = RegValue;
4758 /* Receiver mode Register (RMR)
4760 * <15..13> 000 encoding
4761 * <12..11> 00 FCS = 16bit CRC CCITT (x15 + x12 + x5 + 1)
4762 * <10> 1 1 = Set CRC to all 1s (use for SDLC/HDLC)
4763 * <9> 0 1 = Include Receive chars in CRC
4764 * <8> 1 1 = Use Abort/PE bit as abort indicator
4765 * <7..6> 00 Even parity
4766 * <5> 0 parity disabled
4767 * <4..2> 000 Receive Char Length = 8 bits
4768 * <1..0> 00 Disable Receiver
4770 * 0000 0101 0000 0000 = 0x0500
4775 switch ( info->params.encoding ) {
4776 case HDLC_ENCODING_NRZB: RegValue |= BIT13; break;
4777 case HDLC_ENCODING_NRZI_MARK: RegValue |= BIT14; break;
4778 case HDLC_ENCODING_NRZI_SPACE: RegValue |= BIT14 + BIT13; break;
4779 case HDLC_ENCODING_BIPHASE_MARK: RegValue |= BIT15; break;
4780 case HDLC_ENCODING_BIPHASE_SPACE: RegValue |= BIT15 + BIT13; break;
4781 case HDLC_ENCODING_BIPHASE_LEVEL: RegValue |= BIT15 + BIT14; break;
4782 case HDLC_ENCODING_DIFF_BIPHASE_LEVEL: RegValue |= BIT15 + BIT14 + BIT13; break;
4785 if ( (info->params.crc_type & HDLC_CRC_MASK) == HDLC_CRC_16_CCITT )
4787 else if ( (info->params.crc_type & HDLC_CRC_MASK) == HDLC_CRC_32_CCITT )
4788 RegValue |= ( BIT12 | BIT10 | BIT9 );
4790 usc_OutReg( info, RMR, RegValue );
4792 /* Set the Receive count Limit Register (RCLR) to 0xffff. */
4793 /* When an opening flag of an SDLC frame is recognized the */
4794 /* Receive Character count (RCC) is loaded with the value in */
4795 /* RCLR. The RCC is decremented for each received byte. The */
4796 /* value of RCC is stored after the closing flag of the frame */
4797 /* allowing the frame size to be computed. */
4799 usc_OutReg( info, RCLR, RCLRVALUE );
4801 usc_RCmd( info, RCmd_SelectRicrdma_level );
4803 /* Receive Interrupt Control Register (RICR)
4805 * <15..8> ? RxFIFO DMA Request Level
4806 * <7> 0 Exited Hunt IA (Interrupt Arm)
4807 * <6> 0 Idle Received IA
4808 * <5> 0 Break/Abort IA
4810 * <3> 1 Queued status reflects oldest 2 bytes in FIFO
4812 * <1> 1 Rx Overrun IA
4813 * <0> 0 Select TC0 value for readback
4815 * 0000 0000 0000 1000 = 0x000a
4818 /* Carry over the Exit Hunt and Idle Received bits */
4819 /* in case they have been armed by usc_ArmEvents. */
4821 RegValue = usc_InReg( info, RICR ) & 0xc0;
4823 if ( info->bus_type == MGSL_BUS_TYPE_PCI )
4824 usc_OutReg( info, RICR, (u16)(0x030a | RegValue) );
4826 usc_OutReg( info, RICR, (u16)(0x140a | RegValue) );
4828 /* Unlatch all Rx status bits and clear Rx status IRQ Pending */
4830 usc_UnlatchRxstatusBits( info, RXSTATUS_ALL );
4831 usc_ClearIrqPendingBits( info, RECEIVE_STATUS );
4833 /* Transmit mode Register (TMR)
4835 * <15..13> 000 encoding
4836 * <12..11> 00 FCS = 16bit CRC CCITT (x15 + x12 + x5 + 1)
4837 * <10> 1 1 = Start CRC as all 1s (use for SDLC/HDLC)
4838 * <9> 0 1 = Tx CRC Enabled
4839 * <8> 0 1 = Append CRC to end of transmit frame
4840 * <7..6> 00 Transmit parity Even
4841 * <5> 0 Transmit parity Disabled
4842 * <4..2> 000 Tx Char Length = 8 bits
4843 * <1..0> 00 Disable Transmitter
4845 * 0000 0100 0000 0000 = 0x0400
4850 switch ( info->params.encoding ) {
4851 case HDLC_ENCODING_NRZB: RegValue |= BIT13; break;
4852 case HDLC_ENCODING_NRZI_MARK: RegValue |= BIT14; break;
4853 case HDLC_ENCODING_NRZI_SPACE: RegValue |= BIT14 + BIT13; break;
4854 case HDLC_ENCODING_BIPHASE_MARK: RegValue |= BIT15; break;
4855 case HDLC_ENCODING_BIPHASE_SPACE: RegValue |= BIT15 + BIT13; break;
4856 case HDLC_ENCODING_BIPHASE_LEVEL: RegValue |= BIT15 + BIT14; break;
4857 case HDLC_ENCODING_DIFF_BIPHASE_LEVEL: RegValue |= BIT15 + BIT14 + BIT13; break;
4860 if ( (info->params.crc_type & HDLC_CRC_MASK) == HDLC_CRC_16_CCITT )
4861 RegValue |= BIT9 + BIT8;
4862 else if ( (info->params.crc_type & HDLC_CRC_MASK) == HDLC_CRC_32_CCITT )
4863 RegValue |= ( BIT12 | BIT10 | BIT9 | BIT8);
4865 usc_OutReg( info, TMR, RegValue );
4867 usc_set_txidle( info );
4870 usc_TCmd( info, TCmd_SelectTicrdma_level );
4872 /* Transmit Interrupt Control Register (TICR)
4874 * <15..8> ? Transmit FIFO DMA Level
4875 * <7> 0 Present IA (Interrupt Arm)
4876 * <6> 0 Idle Sent IA
4877 * <5> 1 Abort Sent IA
4878 * <4> 1 EOF/EOM Sent IA
4880 * <2> 1 1 = Wait for SW Trigger to Start Frame
4881 * <1> 1 Tx Underrun IA
4882 * <0> 0 TC0 constant on read back
4884 * 0000 0000 0011 0110 = 0x0036
4887 if ( info->bus_type == MGSL_BUS_TYPE_PCI )
4888 usc_OutReg( info, TICR, 0x0736 );
4890 usc_OutReg( info, TICR, 0x1436 );
4892 usc_UnlatchTxstatusBits( info, TXSTATUS_ALL );
4893 usc_ClearIrqPendingBits( info, TRANSMIT_STATUS );
4896 ** Transmit Command/Status Register (TCSR)
4898 ** <15..12> 0000 TCmd
4899 ** <11> 0/1 UnderWait
4900 ** <10..08> 000 TxIdle
4904 ** <4> x EOF/EOM Sent
4910 ** 0000 0000 0000 0000 = 0x0000
4912 info->tcsr_value = 0;
4915 info->tcsr_value |= TCSR_UNDERWAIT;
4917 usc_OutReg( info, TCSR, info->tcsr_value );
4919 /* Clock mode Control Register (CMCR)
4921 * <15..14> 00 counter 1 Source = Disabled
4922 * <13..12> 00 counter 0 Source = Disabled
4923 * <11..10> 11 BRG1 Input is TxC Pin
4924 * <9..8> 11 BRG0 Input is TxC Pin
4925 * <7..6> 01 DPLL Input is BRG1 Output
4926 * <5..3> XXX TxCLK comes from Port 0
4927 * <2..0> XXX RxCLK comes from Port 1
4929 * 0000 1111 0111 0111 = 0x0f77
4934 if ( info->params.flags & HDLC_FLAG_RXC_DPLL )
4935 RegValue |= 0x0003; /* RxCLK from DPLL */
4936 else if ( info->params.flags & HDLC_FLAG_RXC_BRG )
4937 RegValue |= 0x0004; /* RxCLK from BRG0 */
4938 else if ( info->params.flags & HDLC_FLAG_RXC_TXCPIN)
4939 RegValue |= 0x0006; /* RxCLK from TXC Input */
4941 RegValue |= 0x0007; /* RxCLK from Port1 */
4943 if ( info->params.flags & HDLC_FLAG_TXC_DPLL )
4944 RegValue |= 0x0018; /* TxCLK from DPLL */
4945 else if ( info->params.flags & HDLC_FLAG_TXC_BRG )
4946 RegValue |= 0x0020; /* TxCLK from BRG0 */
4947 else if ( info->params.flags & HDLC_FLAG_TXC_RXCPIN)
4948 RegValue |= 0x0038; /* RxCLK from TXC Input */
4950 RegValue |= 0x0030; /* TxCLK from Port0 */
4952 usc_OutReg( info, CMCR, RegValue );
4955 /* Hardware Configuration Register (HCR)
4957 * <15..14> 00 CTR0 Divisor:00=32,01=16,10=8,11=4
4958 * <13> 0 CTR1DSel:0=CTR0Div determines CTR0Div
4959 * <12> 0 CVOK:0=report code violation in biphase
4960 * <11..10> 00 DPLL Divisor:00=32,01=16,10=8,11=4
4961 * <9..8> XX DPLL mode:00=disable,01=NRZ,10=Biphase,11=Biphase Level
4962 * <7..6> 00 reserved
4963 * <5> 0 BRG1 mode:0=continuous,1=single cycle
4965 * <3..2> 00 reserved
4966 * <1> 0 BRG0 mode:0=continuous,1=single cycle
4972 if ( info->params.flags & (HDLC_FLAG_RXC_DPLL + HDLC_FLAG_TXC_DPLL) ) {
4977 /* DPLL is enabled. Use BRG1 to provide continuous reference clock */
4978 /* for DPLL. DPLL mode in HCR is dependent on the encoding used. */
4980 if ( info->bus_type == MGSL_BUS_TYPE_PCI )
4981 XtalSpeed = 11059200;
4983 XtalSpeed = 14745600;
4985 if ( info->params.flags & HDLC_FLAG_DPLL_DIV16 ) {
4989 else if ( info->params.flags & HDLC_FLAG_DPLL_DIV8 ) {
4996 /* Tc = (Xtal/Speed) - 1 */
4997 /* If twice the remainder of (Xtal/Speed) is greater than Speed */
4998 /* then rounding up gives a more precise time constant. Instead */
4999 /* of rounding up and then subtracting 1 we just don't subtract */
5000 /* the one in this case. */
5002 /*--------------------------------------------------
5003 * ejz: for DPLL mode, application should use the
5004 * same clock speed as the partner system, even
5005 * though clocking is derived from the input RxData.
5006 * In case the user uses a 0 for the clock speed,
5007 * default to 0xffffffff and don't try to divide by
5009 *--------------------------------------------------*/
5010 if ( info->params.clock_speed )
5012 Tc = (u16)((XtalSpeed/DpllDivisor)/info->params.clock_speed);
5013 if ( !((((XtalSpeed/DpllDivisor) % info->params.clock_speed) * 2)
5014 / info->params.clock_speed) )
5021 /* Write 16-bit Time Constant for BRG1 */
5022 usc_OutReg( info, TC1R, Tc );
5024 RegValue |= BIT4; /* enable BRG1 */
5026 switch ( info->params.encoding ) {
5027 case HDLC_ENCODING_NRZ:
5028 case HDLC_ENCODING_NRZB:
5029 case HDLC_ENCODING_NRZI_MARK:
5030 case HDLC_ENCODING_NRZI_SPACE: RegValue |= BIT8; break;
5031 case HDLC_ENCODING_BIPHASE_MARK:
5032 case HDLC_ENCODING_BIPHASE_SPACE: RegValue |= BIT9; break;
5033 case HDLC_ENCODING_BIPHASE_LEVEL:
5034 case HDLC_ENCODING_DIFF_BIPHASE_LEVEL: RegValue |= BIT9 + BIT8; break;
5038 usc_OutReg( info, HCR, RegValue );
5041 /* Channel Control/status Register (CCSR)
5043 * <15> X RCC FIFO Overflow status (RO)
5044 * <14> X RCC FIFO Not Empty status (RO)
5045 * <13> 0 1 = Clear RCC FIFO (WO)
5046 * <12> X DPLL Sync (RW)
5047 * <11> X DPLL 2 Missed Clocks status (RO)
5048 * <10> X DPLL 1 Missed Clock status (RO)
5049 * <9..8> 00 DPLL Resync on rising and falling edges (RW)
5050 * <7> X SDLC Loop On status (RO)
5051 * <6> X SDLC Loop Send status (RO)
5052 * <5> 1 Bypass counters for TxClk and RxClk (RW)
5053 * <4..2> 000 Last Char of SDLC frame has 8 bits (RW)
5054 * <1..0> 00 reserved
5056 * 0000 0000 0010 0000 = 0x0020
5059 usc_OutReg( info, CCSR, 0x1020 );
5062 if ( info->params.flags & HDLC_FLAG_AUTO_CTS ) {
5063 usc_OutReg( info, SICR,
5064 (u16)(usc_InReg(info,SICR) | SICR_CTS_INACTIVE) );
5068 /* enable Master Interrupt Enable bit (MIE) */
5069 usc_EnableMasterIrqBit( info );
5071 usc_ClearIrqPendingBits( info, RECEIVE_STATUS + RECEIVE_DATA +
5072 TRANSMIT_STATUS + TRANSMIT_DATA + MISC);
5074 /* arm RCC underflow interrupt */
5075 usc_OutReg(info, SICR, (u16)(usc_InReg(info,SICR) | BIT3));
5076 usc_EnableInterrupts(info, MISC);
5079 outw( 0, info->io_base ); /* clear Master Bus Enable (DCAR) */
5080 usc_DmaCmd( info, DmaCmd_ResetAllChannels ); /* disable both DMA channels */
5081 info->mbre_bit = BIT8;
5082 outw( BIT8, info->io_base ); /* set Master Bus Enable (DCAR) */
5084 if (info->bus_type == MGSL_BUS_TYPE_ISA) {
5085 /* Enable DMAEN (Port 7, Bit 14) */
5086 /* This connects the DMA request signal to the ISA bus */
5087 usc_OutReg(info, PCR, (u16)((usc_InReg(info, PCR) | BIT15) & ~BIT14));
5090 /* DMA Control Register (DCR)
5092 * <15..14> 10 Priority mode = Alternating Tx/Rx
5093 * 01 Rx has priority
5094 * 00 Tx has priority
5096 * <13> 1 Enable Priority Preempt per DCR<15..14>
5097 * (WARNING DCR<11..10> must be 00 when this is 1)
5098 * 0 Choose activate channel per DCR<11..10>
5100 * <12> 0 Little Endian for Array/List
5101 * <11..10> 00 Both Channels can use each bus grant
5102 * <9..6> 0000 reserved
5103 * <5> 0 7 CLK - Minimum Bus Re-request Interval
5104 * <4> 0 1 = drive D/C and S/D pins
5105 * <3> 1 1 = Add one wait state to all DMA cycles.
5106 * <2> 0 1 = Strobe /UAS on every transfer.
5107 * <1..0> 11 Addr incrementing only affects LS24 bits
5109 * 0110 0000 0000 1011 = 0x600b
5112 if ( info->bus_type == MGSL_BUS_TYPE_PCI ) {
5113 /* PCI adapter does not need DMA wait state */
5114 usc_OutDmaReg( info, DCR, 0xa00b );
5117 usc_OutDmaReg( info, DCR, 0x800b );
5120 /* Receive DMA mode Register (RDMR)
5122 * <15..14> 11 DMA mode = Linked List Buffer mode
5123 * <13> 1 RSBinA/L = store Rx status Block in Arrary/List entry
5124 * <12> 1 Clear count of List Entry after fetching
5125 * <11..10> 00 Address mode = Increment
5126 * <9> 1 Terminate Buffer on RxBound
5127 * <8> 0 Bus Width = 16bits
5128 * <7..0> ? status Bits (write as 0s)
5130 * 1111 0010 0000 0000 = 0xf200
5133 usc_OutDmaReg( info, RDMR, 0xf200 );
5136 /* Transmit DMA mode Register (TDMR)
5138 * <15..14> 11 DMA mode = Linked List Buffer mode
5139 * <13> 1 TCBinA/L = fetch Tx Control Block from List entry
5140 * <12> 1 Clear count of List Entry after fetching
5141 * <11..10> 00 Address mode = Increment
5142 * <9> 1 Terminate Buffer on end of frame
5143 * <8> 0 Bus Width = 16bits
5144 * <7..0> ? status Bits (Read Only so write as 0)
5146 * 1111 0010 0000 0000 = 0xf200
5149 usc_OutDmaReg( info, TDMR, 0xf200 );
5152 /* DMA Interrupt Control Register (DICR)
5154 * <15> 1 DMA Interrupt Enable
5155 * <14> 0 1 = Disable IEO from USC
5156 * <13> 0 1 = Don't provide vector during IntAck
5157 * <12> 1 1 = Include status in Vector
5158 * <10..2> 0 reserved, Must be 0s
5159 * <1> 0 1 = Rx DMA Interrupt Enabled
5160 * <0> 0 1 = Tx DMA Interrupt Enabled
5162 * 1001 0000 0000 0000 = 0x9000
5165 usc_OutDmaReg( info, DICR, 0x9000 );
5167 usc_InDmaReg( info, RDMR ); /* clear pending receive DMA IRQ bits */
5168 usc_InDmaReg( info, TDMR ); /* clear pending transmit DMA IRQ bits */
5169 usc_OutDmaReg( info, CDIR, 0x0303 ); /* clear IUS and Pending for Tx and Rx */
5171 /* Channel Control Register (CCR)
5173 * <15..14> 10 Use 32-bit Tx Control Blocks (TCBs)
5174 * <13> 0 Trigger Tx on SW Command Disabled
5175 * <12> 0 Flag Preamble Disabled
5176 * <11..10> 00 Preamble Length
5177 * <9..8> 00 Preamble Pattern
5178 * <7..6> 10 Use 32-bit Rx status Blocks (RSBs)
5179 * <5> 0 Trigger Rx on SW Command Disabled
5182 * 1000 0000 1000 0000 = 0x8080
5187 switch ( info->params.preamble_length ) {
5188 case HDLC_PREAMBLE_LENGTH_16BITS: RegValue |= BIT10; break;
5189 case HDLC_PREAMBLE_LENGTH_32BITS: RegValue |= BIT11; break;
5190 case HDLC_PREAMBLE_LENGTH_64BITS: RegValue |= BIT11 + BIT10; break;
5193 switch ( info->params.preamble ) {
5194 case HDLC_PREAMBLE_PATTERN_FLAGS: RegValue |= BIT8 + BIT12; break;
5195 case HDLC_PREAMBLE_PATTERN_ONES: RegValue |= BIT8; break;
5196 case HDLC_PREAMBLE_PATTERN_10: RegValue |= BIT9; break;
5197 case HDLC_PREAMBLE_PATTERN_01: RegValue |= BIT9 + BIT8; break;
5200 usc_OutReg( info, CCR, RegValue );
5204 * Burst/Dwell Control Register
5206 * <15..8> 0x20 Maximum number of transfers per bus grant
5207 * <7..0> 0x00 Maximum number of clock cycles per bus grant
5210 if ( info->bus_type == MGSL_BUS_TYPE_PCI ) {
5211 /* don't limit bus occupancy on PCI adapter */
5212 usc_OutDmaReg( info, BDCR, 0x0000 );
5215 usc_OutDmaReg( info, BDCR, 0x2000 );
5217 usc_stop_transmitter(info);
5218 usc_stop_receiver(info);
5220 } /* end of usc_set_sdlc_mode() */
5222 /* usc_enable_loopback()
5224 * Set the 16C32 for internal loopback mode.
5225 * The TxCLK and RxCLK signals are generated from the BRG0 and
5226 * the TxD is looped back to the RxD internally.
5228 * Arguments: info pointer to device instance data
5229 * enable 1 = enable loopback, 0 = disable
5230 * Return Value: None
5232 static void usc_enable_loopback(struct mgsl_struct *info, int enable)
5235 /* blank external TXD output */
5236 usc_OutReg(info,IOCR,usc_InReg(info,IOCR) | (BIT7+BIT6));
5238 /* Clock mode Control Register (CMCR)
5240 * <15..14> 00 counter 1 Disabled
5241 * <13..12> 00 counter 0 Disabled
5242 * <11..10> 11 BRG1 Input is TxC Pin
5243 * <9..8> 11 BRG0 Input is TxC Pin
5244 * <7..6> 01 DPLL Input is BRG1 Output
5245 * <5..3> 100 TxCLK comes from BRG0
5246 * <2..0> 100 RxCLK comes from BRG0
5248 * 0000 1111 0110 0100 = 0x0f64
5251 usc_OutReg( info, CMCR, 0x0f64 );
5253 /* Write 16-bit Time Constant for BRG0 */
5254 /* use clock speed if available, otherwise use 8 for diagnostics */
5255 if (info->params.clock_speed) {
5256 if (info->bus_type == MGSL_BUS_TYPE_PCI)
5257 usc_OutReg(info, TC0R, (u16)((11059200/info->params.clock_speed)-1));
5259 usc_OutReg(info, TC0R, (u16)((14745600/info->params.clock_speed)-1));
5261 usc_OutReg(info, TC0R, (u16)8);
5263 /* Hardware Configuration Register (HCR) Clear Bit 1, BRG0
5264 mode = Continuous Set Bit 0 to enable BRG0. */
5265 usc_OutReg( info, HCR, (u16)((usc_InReg( info, HCR ) & ~BIT1) | BIT0) );
5267 /* Input/Output Control Reg, <2..0> = 100, Drive RxC pin with BRG0 */
5268 usc_OutReg(info, IOCR, (u16)((usc_InReg(info, IOCR) & 0xfff8) | 0x0004));
5270 /* set Internal Data loopback mode */
5271 info->loopback_bits = 0x300;
5272 outw( 0x0300, info->io_base + CCAR );
5274 /* enable external TXD output */
5275 usc_OutReg(info,IOCR,usc_InReg(info,IOCR) & ~(BIT7+BIT6));
5277 /* clear Internal Data loopback mode */
5278 info->loopback_bits = 0;
5279 outw( 0,info->io_base + CCAR );
5282 } /* end of usc_enable_loopback() */
5284 /* usc_enable_aux_clock()
5286 * Enabled the AUX clock output at the specified frequency.
5290 * info pointer to device extension
5291 * data_rate data rate of clock in bits per second
5292 * A data rate of 0 disables the AUX clock.
5294 * Return Value: None
5296 static void usc_enable_aux_clock( struct mgsl_struct *info, u32 data_rate )
5302 if ( info->bus_type == MGSL_BUS_TYPE_PCI )
5303 XtalSpeed = 11059200;
5305 XtalSpeed = 14745600;
5308 /* Tc = (Xtal/Speed) - 1 */
5309 /* If twice the remainder of (Xtal/Speed) is greater than Speed */
5310 /* then rounding up gives a more precise time constant. Instead */
5311 /* of rounding up and then subtracting 1 we just don't subtract */
5312 /* the one in this case. */
5315 Tc = (u16)(XtalSpeed/data_rate);
5316 if ( !(((XtalSpeed % data_rate) * 2) / data_rate) )
5319 /* Write 16-bit Time Constant for BRG0 */
5320 usc_OutReg( info, TC0R, Tc );
5323 * Hardware Configuration Register (HCR)
5324 * Clear Bit 1, BRG0 mode = Continuous
5325 * Set Bit 0 to enable BRG0.
5328 usc_OutReg( info, HCR, (u16)((usc_InReg( info, HCR ) & ~BIT1) | BIT0) );
5330 /* Input/Output Control Reg, <2..0> = 100, Drive RxC pin with BRG0 */
5331 usc_OutReg( info, IOCR, (u16)((usc_InReg(info, IOCR) & 0xfff8) | 0x0004) );
5333 /* data rate == 0 so turn off BRG0 */
5334 usc_OutReg( info, HCR, (u16)(usc_InReg( info, HCR ) & ~BIT0) );
5337 } /* end of usc_enable_aux_clock() */
5341 * usc_process_rxoverrun_sync()
5343 * This function processes a receive overrun by resetting the
5344 * receive DMA buffers and issuing a Purge Rx FIFO command
5345 * to allow the receiver to continue receiving.
5349 * info pointer to device extension
5351 * Return Value: None
5353 static void usc_process_rxoverrun_sync( struct mgsl_struct *info )
5357 int frame_start_index;
5358 bool start_of_frame_found = false;
5359 bool end_of_frame_found = false;
5360 bool reprogram_dma = false;
5362 DMABUFFERENTRY *buffer_list = info->rx_buffer_list;
5365 usc_DmaCmd( info, DmaCmd_PauseRxChannel );
5366 usc_RCmd( info, RCmd_EnterHuntmode );
5367 usc_RTCmd( info, RTCmd_PurgeRxFifo );
5369 /* CurrentRxBuffer points to the 1st buffer of the next */
5370 /* possibly available receive frame. */
5372 frame_start_index = start_index = end_index = info->current_rx_buffer;
5374 /* Search for an unfinished string of buffers. This means */
5375 /* that a receive frame started (at least one buffer with */
5376 /* count set to zero) but there is no terminiting buffer */
5377 /* (status set to non-zero). */
5379 while( !buffer_list[end_index].count )
5381 /* Count field has been reset to zero by 16C32. */
5382 /* This buffer is currently in use. */
5384 if ( !start_of_frame_found )
5386 start_of_frame_found = true;
5387 frame_start_index = end_index;
5388 end_of_frame_found = false;
5391 if ( buffer_list[end_index].status )
5393 /* Status field has been set by 16C32. */
5394 /* This is the last buffer of a received frame. */
5396 /* We want to leave the buffers for this frame intact. */
5397 /* Move on to next possible frame. */
5399 start_of_frame_found = false;
5400 end_of_frame_found = true;
5403 /* advance to next buffer entry in linked list */
5405 if ( end_index == info->rx_buffer_count )
5408 if ( start_index == end_index )
5410 /* The entire list has been searched with all Counts == 0 and */
5411 /* all Status == 0. The receive buffers are */
5412 /* completely screwed, reset all receive buffers! */
5413 mgsl_reset_rx_dma_buffers( info );
5414 frame_start_index = 0;
5415 start_of_frame_found = false;
5416 reprogram_dma = true;
5421 if ( start_of_frame_found && !end_of_frame_found )
5423 /* There is an unfinished string of receive DMA buffers */
5424 /* as a result of the receiver overrun. */
5426 /* Reset the buffers for the unfinished frame */
5427 /* and reprogram the receive DMA controller to start */
5428 /* at the 1st buffer of unfinished frame. */
5430 start_index = frame_start_index;
5434 *((unsigned long *)&(info->rx_buffer_list[start_index++].count)) = DMABUFFERSIZE;
5436 /* Adjust index for wrap around. */
5437 if ( start_index == info->rx_buffer_count )
5440 } while( start_index != end_index );
5442 reprogram_dma = true;
5445 if ( reprogram_dma )
5447 usc_UnlatchRxstatusBits(info,RXSTATUS_ALL);
5448 usc_ClearIrqPendingBits(info, RECEIVE_DATA|RECEIVE_STATUS);
5449 usc_UnlatchRxstatusBits(info, RECEIVE_DATA|RECEIVE_STATUS);
5451 usc_EnableReceiver(info,DISABLE_UNCONDITIONAL);
5453 /* This empties the receive FIFO and loads the RCC with RCLR */
5454 usc_OutReg( info, CCSR, (u16)(usc_InReg(info,CCSR) | BIT13) );
5456 /* program 16C32 with physical address of 1st DMA buffer entry */
5457 phys_addr = info->rx_buffer_list[frame_start_index].phys_entry;
5458 usc_OutDmaReg( info, NRARL, (u16)phys_addr );
5459 usc_OutDmaReg( info, NRARU, (u16)(phys_addr >> 16) );
5461 usc_UnlatchRxstatusBits( info, RXSTATUS_ALL );
5462 usc_ClearIrqPendingBits( info, RECEIVE_DATA + RECEIVE_STATUS );
5463 usc_EnableInterrupts( info, RECEIVE_STATUS );
5465 /* 1. Arm End of Buffer (EOB) Receive DMA Interrupt (BIT2 of RDIAR) */
5466 /* 2. Enable Receive DMA Interrupts (BIT1 of DICR) */
5468 usc_OutDmaReg( info, RDIAR, BIT3 + BIT2 );
5469 usc_OutDmaReg( info, DICR, (u16)(usc_InDmaReg(info,DICR) | BIT1) );
5470 usc_DmaCmd( info, DmaCmd_InitRxChannel );
5471 if ( info->params.flags & HDLC_FLAG_AUTO_DCD )
5472 usc_EnableReceiver(info,ENABLE_AUTO_DCD);
5474 usc_EnableReceiver(info,ENABLE_UNCONDITIONAL);
5478 /* This empties the receive FIFO and loads the RCC with RCLR */
5479 usc_OutReg( info, CCSR, (u16)(usc_InReg(info,CCSR) | BIT13) );
5480 usc_RTCmd( info, RTCmd_PurgeRxFifo );
5483 } /* end of usc_process_rxoverrun_sync() */
5485 /* usc_stop_receiver()
5487 * Disable USC receiver
5489 * Arguments: info pointer to device instance data
5490 * Return Value: None
5492 static void usc_stop_receiver( struct mgsl_struct *info )
5494 if (debug_level >= DEBUG_LEVEL_ISR)
5495 printk("%s(%d):usc_stop_receiver(%s)\n",
5496 __FILE__,__LINE__, info->device_name );
5498 /* Disable receive DMA channel. */
5499 /* This also disables receive DMA channel interrupts */
5500 usc_DmaCmd( info, DmaCmd_ResetRxChannel );
5502 usc_UnlatchRxstatusBits( info, RXSTATUS_ALL );
5503 usc_ClearIrqPendingBits( info, RECEIVE_DATA + RECEIVE_STATUS );
5504 usc_DisableInterrupts( info, RECEIVE_DATA + RECEIVE_STATUS );
5506 usc_EnableReceiver(info,DISABLE_UNCONDITIONAL);
5508 /* This empties the receive FIFO and loads the RCC with RCLR */
5509 usc_OutReg( info, CCSR, (u16)(usc_InReg(info,CCSR) | BIT13) );
5510 usc_RTCmd( info, RTCmd_PurgeRxFifo );
5512 info->rx_enabled = false;
5513 info->rx_overflow = false;
5514 info->rx_rcc_underrun = false;
5516 } /* end of stop_receiver() */
5518 /* usc_start_receiver()
5520 * Enable the USC receiver
5522 * Arguments: info pointer to device instance data
5523 * Return Value: None
5525 static void usc_start_receiver( struct mgsl_struct *info )
5529 if (debug_level >= DEBUG_LEVEL_ISR)
5530 printk("%s(%d):usc_start_receiver(%s)\n",
5531 __FILE__,__LINE__, info->device_name );
5533 mgsl_reset_rx_dma_buffers( info );
5534 usc_stop_receiver( info );
5536 usc_OutReg( info, CCSR, (u16)(usc_InReg(info,CCSR) | BIT13) );
5537 usc_RTCmd( info, RTCmd_PurgeRxFifo );
5539 if ( info->params.mode == MGSL_MODE_HDLC ||
5540 info->params.mode == MGSL_MODE_RAW ) {
5541 /* DMA mode Transfers */
5542 /* Program the DMA controller. */
5543 /* Enable the DMA controller end of buffer interrupt. */
5545 /* program 16C32 with physical address of 1st DMA buffer entry */
5546 phys_addr = info->rx_buffer_list[0].phys_entry;
5547 usc_OutDmaReg( info, NRARL, (u16)phys_addr );
5548 usc_OutDmaReg( info, NRARU, (u16)(phys_addr >> 16) );
5550 usc_UnlatchRxstatusBits( info, RXSTATUS_ALL );
5551 usc_ClearIrqPendingBits( info, RECEIVE_DATA + RECEIVE_STATUS );
5552 usc_EnableInterrupts( info, RECEIVE_STATUS );
5554 /* 1. Arm End of Buffer (EOB) Receive DMA Interrupt (BIT2 of RDIAR) */
5555 /* 2. Enable Receive DMA Interrupts (BIT1 of DICR) */
5557 usc_OutDmaReg( info, RDIAR, BIT3 + BIT2 );
5558 usc_OutDmaReg( info, DICR, (u16)(usc_InDmaReg(info,DICR) | BIT1) );
5559 usc_DmaCmd( info, DmaCmd_InitRxChannel );
5560 if ( info->params.flags & HDLC_FLAG_AUTO_DCD )
5561 usc_EnableReceiver(info,ENABLE_AUTO_DCD);
5563 usc_EnableReceiver(info,ENABLE_UNCONDITIONAL);
5565 usc_UnlatchRxstatusBits(info, RXSTATUS_ALL);
5566 usc_ClearIrqPendingBits(info, RECEIVE_DATA + RECEIVE_STATUS);
5567 usc_EnableInterrupts(info, RECEIVE_DATA);
5569 usc_RTCmd( info, RTCmd_PurgeRxFifo );
5570 usc_RCmd( info, RCmd_EnterHuntmode );
5572 usc_EnableReceiver(info,ENABLE_UNCONDITIONAL);
5575 usc_OutReg( info, CCSR, 0x1020 );
5577 info->rx_enabled = true;
5579 } /* end of usc_start_receiver() */
5581 /* usc_start_transmitter()
5583 * Enable the USC transmitter and send a transmit frame if
5584 * one is loaded in the DMA buffers.
5586 * Arguments: info pointer to device instance data
5587 * Return Value: None
5589 static void usc_start_transmitter( struct mgsl_struct *info )
5592 unsigned int FrameSize;
5594 if (debug_level >= DEBUG_LEVEL_ISR)
5595 printk("%s(%d):usc_start_transmitter(%s)\n",
5596 __FILE__,__LINE__, info->device_name );
5598 if ( info->xmit_cnt ) {
5600 /* If auto RTS enabled and RTS is inactive, then assert */
5601 /* RTS and set a flag indicating that the driver should */
5602 /* negate RTS when the transmission completes. */
5604 info->drop_rts_on_tx_done = false;
5606 if ( info->params.flags & HDLC_FLAG_AUTO_RTS ) {
5607 usc_get_serial_signals( info );
5608 if ( !(info->serial_signals & SerialSignal_RTS) ) {
5609 info->serial_signals |= SerialSignal_RTS;
5610 usc_set_serial_signals( info );
5611 info->drop_rts_on_tx_done = true;
5616 if ( info->params.mode == MGSL_MODE_ASYNC ) {
5617 if ( !info->tx_active ) {
5618 usc_UnlatchTxstatusBits(info, TXSTATUS_ALL);
5619 usc_ClearIrqPendingBits(info, TRANSMIT_STATUS + TRANSMIT_DATA);
5620 usc_EnableInterrupts(info, TRANSMIT_DATA);
5621 usc_load_txfifo(info);
5624 /* Disable transmit DMA controller while programming. */
5625 usc_DmaCmd( info, DmaCmd_ResetTxChannel );
5627 /* Transmit DMA buffer is loaded, so program USC */
5628 /* to send the frame contained in the buffers. */
5630 FrameSize = info->tx_buffer_list[info->start_tx_dma_buffer].rcc;
5632 /* if operating in Raw sync mode, reset the rcc component
5633 * of the tx dma buffer entry, otherwise, the serial controller
5634 * will send a closing sync char after this count.
5636 if ( info->params.mode == MGSL_MODE_RAW )
5637 info->tx_buffer_list[info->start_tx_dma_buffer].rcc = 0;
5639 /* Program the Transmit Character Length Register (TCLR) */
5640 /* and clear FIFO (TCC is loaded with TCLR on FIFO clear) */
5641 usc_OutReg( info, TCLR, (u16)FrameSize );
5643 usc_RTCmd( info, RTCmd_PurgeTxFifo );
5645 /* Program the address of the 1st DMA Buffer Entry in linked list */
5646 phys_addr = info->tx_buffer_list[info->start_tx_dma_buffer].phys_entry;
5647 usc_OutDmaReg( info, NTARL, (u16)phys_addr );
5648 usc_OutDmaReg( info, NTARU, (u16)(phys_addr >> 16) );
5650 usc_UnlatchTxstatusBits( info, TXSTATUS_ALL );
5651 usc_ClearIrqPendingBits( info, TRANSMIT_STATUS );
5652 usc_EnableInterrupts( info, TRANSMIT_STATUS );
5654 if ( info->params.mode == MGSL_MODE_RAW &&
5655 info->num_tx_dma_buffers > 1 ) {
5656 /* When running external sync mode, attempt to 'stream' transmit */
5657 /* by filling tx dma buffers as they become available. To do this */
5658 /* we need to enable Tx DMA EOB Status interrupts : */
5660 /* 1. Arm End of Buffer (EOB) Transmit DMA Interrupt (BIT2 of TDIAR) */
5661 /* 2. Enable Transmit DMA Interrupts (BIT0 of DICR) */
5663 usc_OutDmaReg( info, TDIAR, BIT2|BIT3 );
5664 usc_OutDmaReg( info, DICR, (u16)(usc_InDmaReg(info,DICR) | BIT0) );
5667 /* Initialize Transmit DMA Channel */
5668 usc_DmaCmd( info, DmaCmd_InitTxChannel );
5670 usc_TCmd( info, TCmd_SendFrame );
5672 mod_timer(&info->tx_timer, jiffies +
5673 msecs_to_jiffies(5000));
5675 info->tx_active = true;
5678 if ( !info->tx_enabled ) {
5679 info->tx_enabled = true;
5680 if ( info->params.flags & HDLC_FLAG_AUTO_CTS )
5681 usc_EnableTransmitter(info,ENABLE_AUTO_CTS);
5683 usc_EnableTransmitter(info,ENABLE_UNCONDITIONAL);
5686 } /* end of usc_start_transmitter() */
5688 /* usc_stop_transmitter()
5690 * Stops the transmitter and DMA
5692 * Arguments: info pointer to device isntance data
5693 * Return Value: None
5695 static void usc_stop_transmitter( struct mgsl_struct *info )
5697 if (debug_level >= DEBUG_LEVEL_ISR)
5698 printk("%s(%d):usc_stop_transmitter(%s)\n",
5699 __FILE__,__LINE__, info->device_name );
5701 del_timer(&info->tx_timer);
5703 usc_UnlatchTxstatusBits( info, TXSTATUS_ALL );
5704 usc_ClearIrqPendingBits( info, TRANSMIT_STATUS + TRANSMIT_DATA );
5705 usc_DisableInterrupts( info, TRANSMIT_STATUS + TRANSMIT_DATA );
5707 usc_EnableTransmitter(info,DISABLE_UNCONDITIONAL);
5708 usc_DmaCmd( info, DmaCmd_ResetTxChannel );
5709 usc_RTCmd( info, RTCmd_PurgeTxFifo );
5711 info->tx_enabled = false;
5712 info->tx_active = false;
5714 } /* end of usc_stop_transmitter() */
5716 /* usc_load_txfifo()
5718 * Fill the transmit FIFO until the FIFO is full or
5719 * there is no more data to load.
5721 * Arguments: info pointer to device extension (instance data)
5722 * Return Value: None
5724 static void usc_load_txfifo( struct mgsl_struct *info )
5729 if ( !info->xmit_cnt && !info->x_char )
5732 /* Select transmit FIFO status readback in TICR */
5733 usc_TCmd( info, TCmd_SelectTicrTxFifostatus );
5735 /* load the Transmit FIFO until FIFOs full or all data sent */
5737 while( (Fifocount = usc_InReg(info, TICR) >> 8) && info->xmit_cnt ) {
5738 /* there is more space in the transmit FIFO and */
5739 /* there is more data in transmit buffer */
5741 if ( (info->xmit_cnt > 1) && (Fifocount > 1) && !info->x_char ) {
5742 /* write a 16-bit word from transmit buffer to 16C32 */
5744 TwoBytes[0] = info->xmit_buf[info->xmit_tail++];
5745 info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
5746 TwoBytes[1] = info->xmit_buf[info->xmit_tail++];
5747 info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
5749 outw( *((u16 *)TwoBytes), info->io_base + DATAREG);
5751 info->xmit_cnt -= 2;
5752 info->icount.tx += 2;
5754 /* only 1 byte left to transmit or 1 FIFO slot left */
5756 outw( (inw( info->io_base + CCAR) & 0x0780) | (TDR+LSBONLY),
5757 info->io_base + CCAR );
5760 /* transmit pending high priority char */
5761 outw( info->x_char,info->io_base + CCAR );
5764 outw( info->xmit_buf[info->xmit_tail++],info->io_base + CCAR );
5765 info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
5772 } /* end of usc_load_txfifo() */
5776 * Reset the adapter to a known state and prepare it for further use.
5778 * Arguments: info pointer to device instance data
5779 * Return Value: None
5781 static void usc_reset( struct mgsl_struct *info )
5783 if ( info->bus_type == MGSL_BUS_TYPE_PCI ) {
5787 /* Set BIT30 of Misc Control Register */
5788 /* (Local Control Register 0x50) to force reset of USC. */
5790 volatile u32 *MiscCtrl = (u32 *)(info->lcr_base + 0x50);
5791 u32 *LCR0BRDR = (u32 *)(info->lcr_base + 0x28);
5793 info->misc_ctrl_value |= BIT30;
5794 *MiscCtrl = info->misc_ctrl_value;
5797 * Force at least 170ns delay before clearing
5798 * reset bit. Each read from LCR takes at least
5799 * 30ns so 10 times for 300ns to be safe.
5802 readval = *MiscCtrl;
5804 info->misc_ctrl_value &= ~BIT30;
5805 *MiscCtrl = info->misc_ctrl_value;
5807 *LCR0BRDR = BUS_DESCRIPTOR(
5808 1, // Write Strobe Hold (0-3)
5809 2, // Write Strobe Delay (0-3)
5810 2, // Read Strobe Delay (0-3)
5811 0, // NWDD (Write data-data) (0-3)
5812 4, // NWAD (Write Addr-data) (0-31)
5813 0, // NXDA (Read/Write Data-Addr) (0-3)
5814 0, // NRDD (Read Data-Data) (0-3)
5815 5 // NRAD (Read Addr-Data) (0-31)
5819 outb( 0,info->io_base + 8 );
5823 info->loopback_bits = 0;
5824 info->usc_idle_mode = 0;
5827 * Program the Bus Configuration Register (BCR)
5829 * <15> 0 Don't use separate address
5830 * <14..6> 0 reserved
5831 * <5..4> 00 IAckmode = Default, don't care
5832 * <3> 1 Bus Request Totem Pole output
5833 * <2> 1 Use 16 Bit data bus
5834 * <1> 0 IRQ Totem Pole output
5835 * <0> 0 Don't Shift Right Addr
5837 * 0000 0000 0000 1100 = 0x000c
5839 * By writing to io_base + SDPIN the Wait/Ack pin is
5840 * programmed to work as a Wait pin.
5843 outw( 0x000c,info->io_base + SDPIN );
5846 outw( 0,info->io_base );
5847 outw( 0,info->io_base + CCAR );
5849 /* select little endian byte ordering */
5850 usc_RTCmd( info, RTCmd_SelectLittleEndian );
5853 /* Port Control Register (PCR)
5855 * <15..14> 11 Port 7 is Output (~DMAEN, Bit 14 : 0 = Enabled)
5856 * <13..12> 11 Port 6 is Output (~INTEN, Bit 12 : 0 = Enabled)
5857 * <11..10> 00 Port 5 is Input (No Connect, Don't Care)
5858 * <9..8> 00 Port 4 is Input (No Connect, Don't Care)
5859 * <7..6> 11 Port 3 is Output (~RTS, Bit 6 : 0 = Enabled )
5860 * <5..4> 11 Port 2 is Output (~DTR, Bit 4 : 0 = Enabled )
5861 * <3..2> 01 Port 1 is Input (Dedicated RxC)
5862 * <1..0> 01 Port 0 is Input (Dedicated TxC)
5864 * 1111 0000 1111 0101 = 0xf0f5
5867 usc_OutReg( info, PCR, 0xf0f5 );
5871 * Input/Output Control Register
5873 * <15..14> 00 CTS is active low input
5874 * <13..12> 00 DCD is active low input
5875 * <11..10> 00 TxREQ pin is input (DSR)
5876 * <9..8> 00 RxREQ pin is input (RI)
5877 * <7..6> 00 TxD is output (Transmit Data)
5878 * <5..3> 000 TxC Pin in Input (14.7456MHz Clock)
5879 * <2..0> 100 RxC is Output (drive with BRG0)
5881 * 0000 0000 0000 0100 = 0x0004
5884 usc_OutReg( info, IOCR, 0x0004 );
5886 } /* end of usc_reset() */
5888 /* usc_set_async_mode()
5890 * Program adapter for asynchronous communications.
5892 * Arguments: info pointer to device instance data
5893 * Return Value: None
5895 static void usc_set_async_mode( struct mgsl_struct *info )
5899 /* disable interrupts while programming USC */
5900 usc_DisableMasterIrqBit( info );
5902 outw( 0, info->io_base ); /* clear Master Bus Enable (DCAR) */
5903 usc_DmaCmd( info, DmaCmd_ResetAllChannels ); /* disable both DMA channels */
5905 usc_loopback_frame( info );
5907 /* Channel mode Register (CMR)
5909 * <15..14> 00 Tx Sub modes, 00 = 1 Stop Bit
5910 * <13..12> 00 00 = 16X Clock
5911 * <11..8> 0000 Transmitter mode = Asynchronous
5912 * <7..6> 00 reserved?
5913 * <5..4> 00 Rx Sub modes, 00 = 16X Clock
5914 * <3..0> 0000 Receiver mode = Asynchronous
5916 * 0000 0000 0000 0000 = 0x0
5920 if ( info->params.stop_bits != 1 )
5922 usc_OutReg( info, CMR, RegValue );
5925 /* Receiver mode Register (RMR)
5927 * <15..13> 000 encoding = None
5928 * <12..08> 00000 reserved (Sync Only)
5929 * <7..6> 00 Even parity
5930 * <5> 0 parity disabled
5931 * <4..2> 000 Receive Char Length = 8 bits
5932 * <1..0> 00 Disable Receiver
5934 * 0000 0000 0000 0000 = 0x0
5939 if ( info->params.data_bits != 8 )
5940 RegValue |= BIT4+BIT3+BIT2;
5942 if ( info->params.parity != ASYNC_PARITY_NONE ) {
5944 if ( info->params.parity != ASYNC_PARITY_ODD )
5948 usc_OutReg( info, RMR, RegValue );
5951 /* Set IRQ trigger level */
5953 usc_RCmd( info, RCmd_SelectRicrIntLevel );
5956 /* Receive Interrupt Control Register (RICR)
5958 * <15..8> ? RxFIFO IRQ Request Level
5960 * Note: For async mode the receive FIFO level must be set
5961 * to 0 to avoid the situation where the FIFO contains fewer bytes
5962 * than the trigger level and no more data is expected.
5964 * <7> 0 Exited Hunt IA (Interrupt Arm)
5965 * <6> 0 Idle Received IA
5966 * <5> 0 Break/Abort IA
5968 * <3> 0 Queued status reflects oldest byte in FIFO
5970 * <1> 0 Rx Overrun IA
5971 * <0> 0 Select TC0 value for readback
5973 * 0000 0000 0100 0000 = 0x0000 + (FIFOLEVEL in MSB)
5976 usc_OutReg( info, RICR, 0x0000 );
5978 usc_UnlatchRxstatusBits( info, RXSTATUS_ALL );
5979 usc_ClearIrqPendingBits( info, RECEIVE_STATUS );
5982 /* Transmit mode Register (TMR)
5984 * <15..13> 000 encoding = None
5985 * <12..08> 00000 reserved (Sync Only)
5986 * <7..6> 00 Transmit parity Even
5987 * <5> 0 Transmit parity Disabled
5988 * <4..2> 000 Tx Char Length = 8 bits
5989 * <1..0> 00 Disable Transmitter
5991 * 0000 0000 0000 0000 = 0x0
5996 if ( info->params.data_bits != 8 )
5997 RegValue |= BIT4+BIT3+BIT2;
5999 if ( info->params.parity != ASYNC_PARITY_NONE ) {
6001 if ( info->params.parity != ASYNC_PARITY_ODD )
6005 usc_OutReg( info, TMR, RegValue );
6007 usc_set_txidle( info );
6010 /* Set IRQ trigger level */
6012 usc_TCmd( info, TCmd_SelectTicrIntLevel );
6015 /* Transmit Interrupt Control Register (TICR)
6017 * <15..8> ? Transmit FIFO IRQ Level
6018 * <7> 0 Present IA (Interrupt Arm)
6019 * <6> 1 Idle Sent IA
6020 * <5> 0 Abort Sent IA
6021 * <4> 0 EOF/EOM Sent IA
6023 * <2> 0 1 = Wait for SW Trigger to Start Frame
6024 * <1> 0 Tx Underrun IA
6025 * <0> 0 TC0 constant on read back
6027 * 0000 0000 0100 0000 = 0x0040
6030 usc_OutReg( info, TICR, 0x1f40 );
6032 usc_UnlatchTxstatusBits( info, TXSTATUS_ALL );
6033 usc_ClearIrqPendingBits( info, TRANSMIT_STATUS );
6035 usc_enable_async_clock( info, info->params.data_rate );
6038 /* Channel Control/status Register (CCSR)
6040 * <15> X RCC FIFO Overflow status (RO)
6041 * <14> X RCC FIFO Not Empty status (RO)
6042 * <13> 0 1 = Clear RCC FIFO (WO)
6043 * <12> X DPLL in Sync status (RO)
6044 * <11> X DPLL 2 Missed Clocks status (RO)
6045 * <10> X DPLL 1 Missed Clock status (RO)
6046 * <9..8> 00 DPLL Resync on rising and falling edges (RW)
6047 * <7> X SDLC Loop On status (RO)
6048 * <6> X SDLC Loop Send status (RO)
6049 * <5> 1 Bypass counters for TxClk and RxClk (RW)
6050 * <4..2> 000 Last Char of SDLC frame has 8 bits (RW)
6051 * <1..0> 00 reserved
6053 * 0000 0000 0010 0000 = 0x0020
6056 usc_OutReg( info, CCSR, 0x0020 );
6058 usc_DisableInterrupts( info, TRANSMIT_STATUS + TRANSMIT_DATA +
6059 RECEIVE_DATA + RECEIVE_STATUS );
6061 usc_ClearIrqPendingBits( info, TRANSMIT_STATUS + TRANSMIT_DATA +
6062 RECEIVE_DATA + RECEIVE_STATUS );
6064 usc_EnableMasterIrqBit( info );
6066 if (info->bus_type == MGSL_BUS_TYPE_ISA) {
6067 /* Enable INTEN (Port 6, Bit12) */
6068 /* This connects the IRQ request signal to the ISA bus */
6069 usc_OutReg(info, PCR, (u16)((usc_InReg(info, PCR) | BIT13) & ~BIT12));
6072 if (info->params.loopback) {
6073 info->loopback_bits = 0x300;
6074 outw(0x0300, info->io_base + CCAR);
6077 } /* end of usc_set_async_mode() */
6079 /* usc_loopback_frame()
6081 * Loop back a small (2 byte) dummy SDLC frame.
6082 * Interrupts and DMA are NOT used. The purpose of this is to
6083 * clear any 'stale' status info left over from running in async mode.
6085 * The 16C32 shows the strange behaviour of marking the 1st
6086 * received SDLC frame with a CRC error even when there is no
6087 * CRC error. To get around this a small dummy from of 2 bytes
6088 * is looped back when switching from async to sync mode.
6090 * Arguments: info pointer to device instance data
6091 * Return Value: None
6093 static void usc_loopback_frame( struct mgsl_struct *info )
6096 unsigned long oldmode = info->params.mode;
6098 info->params.mode = MGSL_MODE_HDLC;
6100 usc_DisableMasterIrqBit( info );
6102 usc_set_sdlc_mode( info );
6103 usc_enable_loopback( info, 1 );
6105 /* Write 16-bit Time Constant for BRG0 */
6106 usc_OutReg( info, TC0R, 0 );
6108 /* Channel Control Register (CCR)
6110 * <15..14> 00 Don't use 32-bit Tx Control Blocks (TCBs)
6111 * <13> 0 Trigger Tx on SW Command Disabled
6112 * <12> 0 Flag Preamble Disabled
6113 * <11..10> 00 Preamble Length = 8-Bits
6114 * <9..8> 01 Preamble Pattern = flags
6115 * <7..6> 10 Don't use 32-bit Rx status Blocks (RSBs)
6116 * <5> 0 Trigger Rx on SW Command Disabled
6119 * 0000 0001 0000 0000 = 0x0100
6122 usc_OutReg( info, CCR, 0x0100 );
6124 /* SETUP RECEIVER */
6125 usc_RTCmd( info, RTCmd_PurgeRxFifo );
6126 usc_EnableReceiver(info,ENABLE_UNCONDITIONAL);
6128 /* SETUP TRANSMITTER */
6129 /* Program the Transmit Character Length Register (TCLR) */
6130 /* and clear FIFO (TCC is loaded with TCLR on FIFO clear) */
6131 usc_OutReg( info, TCLR, 2 );
6132 usc_RTCmd( info, RTCmd_PurgeTxFifo );
6134 /* unlatch Tx status bits, and start transmit channel. */
6135 usc_UnlatchTxstatusBits(info,TXSTATUS_ALL);
6136 outw(0,info->io_base + DATAREG);
6138 /* ENABLE TRANSMITTER */
6139 usc_TCmd( info, TCmd_SendFrame );
6140 usc_EnableTransmitter(info,ENABLE_UNCONDITIONAL);
6142 /* WAIT FOR RECEIVE COMPLETE */
6143 for (i=0 ; i<1000 ; i++)
6144 if (usc_InReg( info, RCSR ) & (BIT8 + BIT4 + BIT3 + BIT1))
6147 /* clear Internal Data loopback mode */
6148 usc_enable_loopback(info, 0);
6150 usc_EnableMasterIrqBit(info);
6152 info->params.mode = oldmode;
6154 } /* end of usc_loopback_frame() */
6156 /* usc_set_sync_mode() Programs the USC for SDLC communications.
6158 * Arguments: info pointer to adapter info structure
6159 * Return Value: None
6161 static void usc_set_sync_mode( struct mgsl_struct *info )
6163 usc_loopback_frame( info );
6164 usc_set_sdlc_mode( info );
6166 if (info->bus_type == MGSL_BUS_TYPE_ISA) {
6167 /* Enable INTEN (Port 6, Bit12) */
6168 /* This connects the IRQ request signal to the ISA bus */
6169 usc_OutReg(info, PCR, (u16)((usc_InReg(info, PCR) | BIT13) & ~BIT12));
6172 usc_enable_aux_clock(info, info->params.clock_speed);
6174 if (info->params.loopback)
6175 usc_enable_loopback(info,1);
6177 } /* end of mgsl_set_sync_mode() */
6179 /* usc_set_txidle() Set the HDLC idle mode for the transmitter.
6181 * Arguments: info pointer to device instance data
6182 * Return Value: None
6184 static void usc_set_txidle( struct mgsl_struct *info )
6186 u16 usc_idle_mode = IDLEMODE_FLAGS;
6188 /* Map API idle mode to USC register bits */
6190 switch( info->idle_mode ){
6191 case HDLC_TXIDLE_FLAGS: usc_idle_mode = IDLEMODE_FLAGS; break;
6192 case HDLC_TXIDLE_ALT_ZEROS_ONES: usc_idle_mode = IDLEMODE_ALT_ONE_ZERO; break;
6193 case HDLC_TXIDLE_ZEROS: usc_idle_mode = IDLEMODE_ZERO; break;
6194 case HDLC_TXIDLE_ONES: usc_idle_mode = IDLEMODE_ONE; break;
6195 case HDLC_TXIDLE_ALT_MARK_SPACE: usc_idle_mode = IDLEMODE_ALT_MARK_SPACE; break;
6196 case HDLC_TXIDLE_SPACE: usc_idle_mode = IDLEMODE_SPACE; break;
6197 case HDLC_TXIDLE_MARK: usc_idle_mode = IDLEMODE_MARK; break;
6200 info->usc_idle_mode = usc_idle_mode;
6201 //usc_OutReg(info, TCSR, usc_idle_mode);
6202 info->tcsr_value &= ~IDLEMODE_MASK; /* clear idle mode bits */
6203 info->tcsr_value += usc_idle_mode;
6204 usc_OutReg(info, TCSR, info->tcsr_value);
6207 * if SyncLink WAN adapter is running in external sync mode, the
6208 * transmitter has been set to Monosync in order to try to mimic
6209 * a true raw outbound bit stream. Monosync still sends an open/close
6210 * sync char at the start/end of a frame. Try to match those sync
6211 * patterns to the idle mode set here
6213 if ( info->params.mode == MGSL_MODE_RAW ) {
6214 unsigned char syncpat = 0;
6215 switch( info->idle_mode ) {
6216 case HDLC_TXIDLE_FLAGS:
6219 case HDLC_TXIDLE_ALT_ZEROS_ONES:
6222 case HDLC_TXIDLE_ZEROS:
6223 case HDLC_TXIDLE_SPACE:
6226 case HDLC_TXIDLE_ONES:
6227 case HDLC_TXIDLE_MARK:
6230 case HDLC_TXIDLE_ALT_MARK_SPACE:
6235 usc_SetTransmitSyncChars(info,syncpat,syncpat);
6238 } /* end of usc_set_txidle() */
6240 /* usc_get_serial_signals()
6242 * Query the adapter for the state of the V24 status (input) signals.
6244 * Arguments: info pointer to device instance data
6245 * Return Value: None
6247 static void usc_get_serial_signals( struct mgsl_struct *info )
6251 /* clear all serial signals except DTR and RTS */
6252 info->serial_signals &= SerialSignal_DTR + SerialSignal_RTS;
6254 /* Read the Misc Interrupt status Register (MISR) to get */
6255 /* the V24 status signals. */
6257 status = usc_InReg( info, MISR );
6259 /* set serial signal bits to reflect MISR */
6261 if ( status & MISCSTATUS_CTS )
6262 info->serial_signals |= SerialSignal_CTS;
6264 if ( status & MISCSTATUS_DCD )
6265 info->serial_signals |= SerialSignal_DCD;
6267 if ( status & MISCSTATUS_RI )
6268 info->serial_signals |= SerialSignal_RI;
6270 if ( status & MISCSTATUS_DSR )
6271 info->serial_signals |= SerialSignal_DSR;
6273 } /* end of usc_get_serial_signals() */
6275 /* usc_set_serial_signals()
6277 * Set the state of DTR and RTS based on contents of
6278 * serial_signals member of device extension.
6280 * Arguments: info pointer to device instance data
6281 * Return Value: None
6283 static void usc_set_serial_signals( struct mgsl_struct *info )
6286 unsigned char V24Out = info->serial_signals;
6288 /* get the current value of the Port Control Register (PCR) */
6290 Control = usc_InReg( info, PCR );
6292 if ( V24Out & SerialSignal_RTS )
6297 if ( V24Out & SerialSignal_DTR )
6302 usc_OutReg( info, PCR, Control );
6304 } /* end of usc_set_serial_signals() */
6306 /* usc_enable_async_clock()
6308 * Enable the async clock at the specified frequency.
6310 * Arguments: info pointer to device instance data
6311 * data_rate data rate of clock in bps
6312 * 0 disables the AUX clock.
6313 * Return Value: None
6315 static void usc_enable_async_clock( struct mgsl_struct *info, u32 data_rate )
6319 * Clock mode Control Register (CMCR)
6321 * <15..14> 00 counter 1 Disabled
6322 * <13..12> 00 counter 0 Disabled
6323 * <11..10> 11 BRG1 Input is TxC Pin
6324 * <9..8> 11 BRG0 Input is TxC Pin
6325 * <7..6> 01 DPLL Input is BRG1 Output
6326 * <5..3> 100 TxCLK comes from BRG0
6327 * <2..0> 100 RxCLK comes from BRG0
6329 * 0000 1111 0110 0100 = 0x0f64
6332 usc_OutReg( info, CMCR, 0x0f64 );
6336 * Write 16-bit Time Constant for BRG0
6337 * Time Constant = (ClkSpeed / data_rate) - 1
6338 * ClkSpeed = 921600 (ISA), 691200 (PCI)
6341 if ( info->bus_type == MGSL_BUS_TYPE_PCI )
6342 usc_OutReg( info, TC0R, (u16)((691200/data_rate) - 1) );
6344 usc_OutReg( info, TC0R, (u16)((921600/data_rate) - 1) );
6348 * Hardware Configuration Register (HCR)
6349 * Clear Bit 1, BRG0 mode = Continuous
6350 * Set Bit 0 to enable BRG0.
6353 usc_OutReg( info, HCR,
6354 (u16)((usc_InReg( info, HCR ) & ~BIT1) | BIT0) );
6357 /* Input/Output Control Reg, <2..0> = 100, Drive RxC pin with BRG0 */
6359 usc_OutReg( info, IOCR,
6360 (u16)((usc_InReg(info, IOCR) & 0xfff8) | 0x0004) );
6362 /* data rate == 0 so turn off BRG0 */
6363 usc_OutReg( info, HCR, (u16)(usc_InReg( info, HCR ) & ~BIT0) );
6366 } /* end of usc_enable_async_clock() */
6369 * Buffer Structures:
6371 * Normal memory access uses virtual addresses that can make discontiguous
6372 * physical memory pages appear to be contiguous in the virtual address
6373 * space (the processors memory mapping handles the conversions).
6375 * DMA transfers require physically contiguous memory. This is because
6376 * the DMA system controller and DMA bus masters deal with memory using
6377 * only physical addresses.
6379 * This causes a problem under Windows NT when large DMA buffers are
6380 * needed. Fragmentation of the nonpaged pool prevents allocations of
6381 * physically contiguous buffers larger than the PAGE_SIZE.
6383 * However the 16C32 supports Bus Master Scatter/Gather DMA which
6384 * allows DMA transfers to physically discontiguous buffers. Information
6385 * about each data transfer buffer is contained in a memory structure
6386 * called a 'buffer entry'. A list of buffer entries is maintained
6387 * to track and control the use of the data transfer buffers.
6389 * To support this strategy we will allocate sufficient PAGE_SIZE
6390 * contiguous memory buffers to allow for the total required buffer
6393 * The 16C32 accesses the list of buffer entries using Bus Master
6394 * DMA. Control information is read from the buffer entries by the
6395 * 16C32 to control data transfers. status information is written to
6396 * the buffer entries by the 16C32 to indicate the status of completed
6399 * The CPU writes control information to the buffer entries to control
6400 * the 16C32 and reads status information from the buffer entries to
6401 * determine information about received and transmitted frames.
6403 * Because the CPU and 16C32 (adapter) both need simultaneous access
6404 * to the buffer entries, the buffer entry memory is allocated with
6405 * HalAllocateCommonBuffer(). This restricts the size of the buffer
6406 * entry list to PAGE_SIZE.
6408 * The actual data buffers on the other hand will only be accessed
6409 * by the CPU or the adapter but not by both simultaneously. This allows
6410 * Scatter/Gather packet based DMA procedures for using physically
6411 * discontiguous pages.
6415 * mgsl_reset_tx_dma_buffers()
6417 * Set the count for all transmit buffers to 0 to indicate the
6418 * buffer is available for use and set the current buffer to the
6419 * first buffer. This effectively makes all buffers free and
6420 * discards any data in buffers.
6422 * Arguments: info pointer to device instance data
6423 * Return Value: None
6425 static void mgsl_reset_tx_dma_buffers( struct mgsl_struct *info )
6429 for ( i = 0; i < info->tx_buffer_count; i++ ) {
6430 *((unsigned long *)&(info->tx_buffer_list[i].count)) = 0;
6433 info->current_tx_buffer = 0;
6434 info->start_tx_dma_buffer = 0;
6435 info->tx_dma_buffers_used = 0;
6437 info->get_tx_holding_index = 0;
6438 info->put_tx_holding_index = 0;
6439 info->tx_holding_count = 0;
6441 } /* end of mgsl_reset_tx_dma_buffers() */
6444 * num_free_tx_dma_buffers()
6446 * returns the number of free tx dma buffers available
6448 * Arguments: info pointer to device instance data
6449 * Return Value: number of free tx dma buffers
6451 static int num_free_tx_dma_buffers(struct mgsl_struct *info)
6453 return info->tx_buffer_count - info->tx_dma_buffers_used;
6457 * mgsl_reset_rx_dma_buffers()
6459 * Set the count for all receive buffers to DMABUFFERSIZE
6460 * and set the current buffer to the first buffer. This effectively
6461 * makes all buffers free and discards any data in buffers.
6463 * Arguments: info pointer to device instance data
6464 * Return Value: None
6466 static void mgsl_reset_rx_dma_buffers( struct mgsl_struct *info )
6470 for ( i = 0; i < info->rx_buffer_count; i++ ) {
6471 *((unsigned long *)&(info->rx_buffer_list[i].count)) = DMABUFFERSIZE;
6472 // info->rx_buffer_list[i].count = DMABUFFERSIZE;
6473 // info->rx_buffer_list[i].status = 0;
6476 info->current_rx_buffer = 0;
6478 } /* end of mgsl_reset_rx_dma_buffers() */
6481 * mgsl_free_rx_frame_buffers()
6483 * Free the receive buffers used by a received SDLC
6484 * frame such that the buffers can be reused.
6488 * info pointer to device instance data
6489 * StartIndex index of 1st receive buffer of frame
6490 * EndIndex index of last receive buffer of frame
6492 * Return Value: None
6494 static void mgsl_free_rx_frame_buffers( struct mgsl_struct *info, unsigned int StartIndex, unsigned int EndIndex )
6497 DMABUFFERENTRY *pBufEntry;
6500 /* Starting with 1st buffer entry of the frame clear the status */
6501 /* field and set the count field to DMA Buffer Size. */
6506 pBufEntry = &(info->rx_buffer_list[Index]);
6508 if ( Index == EndIndex ) {
6509 /* This is the last buffer of the frame! */
6513 /* reset current buffer for reuse */
6514 // pBufEntry->status = 0;
6515 // pBufEntry->count = DMABUFFERSIZE;
6516 *((unsigned long *)&(pBufEntry->count)) = DMABUFFERSIZE;
6518 /* advance to next buffer entry in linked list */
6520 if ( Index == info->rx_buffer_count )
6524 /* set current buffer to next buffer after last buffer of frame */
6525 info->current_rx_buffer = Index;
6527 } /* end of free_rx_frame_buffers() */
6529 /* mgsl_get_rx_frame()
6531 * This function attempts to return a received SDLC frame from the
6532 * receive DMA buffers. Only frames received without errors are returned.
6534 * Arguments: info pointer to device extension
6535 * Return Value: true if frame returned, otherwise false
6537 static bool mgsl_get_rx_frame(struct mgsl_struct *info)
6539 unsigned int StartIndex, EndIndex; /* index of 1st and last buffers of Rx frame */
6540 unsigned short status;
6541 DMABUFFERENTRY *pBufEntry;
6542 unsigned int framesize = 0;
6543 bool ReturnCode = false;
6544 unsigned long flags;
6545 struct tty_struct *tty = info->port.tty;
6546 bool return_frame = false;
6549 * current_rx_buffer points to the 1st buffer of the next available
6550 * receive frame. To find the last buffer of the frame look for
6551 * a non-zero status field in the buffer entries. (The status
6552 * field is set by the 16C32 after completing a receive frame.
6555 StartIndex = EndIndex = info->current_rx_buffer;
6557 while( !info->rx_buffer_list[EndIndex].status ) {
6559 * If the count field of the buffer entry is non-zero then
6560 * this buffer has not been used. (The 16C32 clears the count
6561 * field when it starts using the buffer.) If an unused buffer
6562 * is encountered then there are no frames available.
6565 if ( info->rx_buffer_list[EndIndex].count )
6568 /* advance to next buffer entry in linked list */
6570 if ( EndIndex == info->rx_buffer_count )
6573 /* if entire list searched then no frame available */
6574 if ( EndIndex == StartIndex ) {
6575 /* If this occurs then something bad happened,
6576 * all buffers have been 'used' but none mark
6577 * the end of a frame. Reset buffers and receiver.
6580 if ( info->rx_enabled ){
6581 spin_lock_irqsave(&info->irq_spinlock,flags);
6582 usc_start_receiver(info);
6583 spin_unlock_irqrestore(&info->irq_spinlock,flags);
6590 /* check status of receive frame */
6592 status = info->rx_buffer_list[EndIndex].status;
6594 if ( status & (RXSTATUS_SHORT_FRAME + RXSTATUS_OVERRUN +
6595 RXSTATUS_CRC_ERROR + RXSTATUS_ABORT) ) {
6596 if ( status & RXSTATUS_SHORT_FRAME )
6597 info->icount.rxshort++;
6598 else if ( status & RXSTATUS_ABORT )
6599 info->icount.rxabort++;
6600 else if ( status & RXSTATUS_OVERRUN )
6601 info->icount.rxover++;
6603 info->icount.rxcrc++;
6604 if ( info->params.crc_type & HDLC_CRC_RETURN_EX )
6605 return_frame = true;
6608 #if SYNCLINK_GENERIC_HDLC
6610 info->netdev->stats.rx_errors++;
6611 info->netdev->stats.rx_frame_errors++;
6615 return_frame = true;
6617 if ( return_frame ) {
6618 /* receive frame has no errors, get frame size.
6619 * The frame size is the starting value of the RCC (which was
6620 * set to 0xffff) minus the ending value of the RCC (decremented
6621 * once for each receive character) minus 2 for the 16-bit CRC.
6624 framesize = RCLRVALUE - info->rx_buffer_list[EndIndex].rcc;
6626 /* adjust frame size for CRC if any */
6627 if ( info->params.crc_type == HDLC_CRC_16_CCITT )
6629 else if ( info->params.crc_type == HDLC_CRC_32_CCITT )
6633 if ( debug_level >= DEBUG_LEVEL_BH )
6634 printk("%s(%d):mgsl_get_rx_frame(%s) status=%04X size=%d\n",
6635 __FILE__,__LINE__,info->device_name,status,framesize);
6637 if ( debug_level >= DEBUG_LEVEL_DATA )
6638 mgsl_trace_block(info,info->rx_buffer_list[StartIndex].virt_addr,
6639 min_t(int, framesize, DMABUFFERSIZE),0);
6642 if ( ( (info->params.crc_type & HDLC_CRC_RETURN_EX) &&
6643 ((framesize+1) > info->max_frame_size) ) ||
6644 (framesize > info->max_frame_size) )
6645 info->icount.rxlong++;
6647 /* copy dma buffer(s) to contiguous intermediate buffer */
6648 int copy_count = framesize;
6649 int index = StartIndex;
6650 unsigned char *ptmp = info->intermediate_rxbuffer;
6652 if ( !(status & RXSTATUS_CRC_ERROR))
6653 info->icount.rxok++;
6657 if ( copy_count > DMABUFFERSIZE )
6658 partial_count = DMABUFFERSIZE;
6660 partial_count = copy_count;
6662 pBufEntry = &(info->rx_buffer_list[index]);
6663 memcpy( ptmp, pBufEntry->virt_addr, partial_count );
6664 ptmp += partial_count;
6665 copy_count -= partial_count;
6667 if ( ++index == info->rx_buffer_count )
6671 if ( info->params.crc_type & HDLC_CRC_RETURN_EX ) {
6673 *ptmp = (status & RXSTATUS_CRC_ERROR ?
6677 if ( debug_level >= DEBUG_LEVEL_DATA )
6678 printk("%s(%d):mgsl_get_rx_frame(%s) rx frame status=%d\n",
6679 __FILE__,__LINE__,info->device_name,
6683 #if SYNCLINK_GENERIC_HDLC
6685 hdlcdev_rx(info,info->intermediate_rxbuffer,framesize);
6688 ldisc_receive_buf(tty, info->intermediate_rxbuffer, info->flag_buf, framesize);
6691 /* Free the buffers used by this frame. */
6692 mgsl_free_rx_frame_buffers( info, StartIndex, EndIndex );
6698 if ( info->rx_enabled && info->rx_overflow ) {
6699 /* The receiver needs to restarted because of
6700 * a receive overflow (buffer or FIFO). If the
6701 * receive buffers are now empty, then restart receiver.
6704 if ( !info->rx_buffer_list[EndIndex].status &&
6705 info->rx_buffer_list[EndIndex].count ) {
6706 spin_lock_irqsave(&info->irq_spinlock,flags);
6707 usc_start_receiver(info);
6708 spin_unlock_irqrestore(&info->irq_spinlock,flags);
6714 } /* end of mgsl_get_rx_frame() */
6716 /* mgsl_get_raw_rx_frame()
6718 * This function attempts to return a received frame from the
6719 * receive DMA buffers when running in external loop mode. In this mode,
6720 * we will return at most one DMABUFFERSIZE frame to the application.
6721 * The USC receiver is triggering off of DCD going active to start a new
6722 * frame, and DCD going inactive to terminate the frame (similar to
6723 * processing a closing flag character).
6725 * In this routine, we will return DMABUFFERSIZE "chunks" at a time.
6726 * If DCD goes inactive, the last Rx DMA Buffer will have a non-zero
6727 * status field and the RCC field will indicate the length of the
6728 * entire received frame. We take this RCC field and get the modulus
6729 * of RCC and DMABUFFERSIZE to determine if number of bytes in the
6730 * last Rx DMA buffer and return that last portion of the frame.
6732 * Arguments: info pointer to device extension
6733 * Return Value: true if frame returned, otherwise false
6735 static bool mgsl_get_raw_rx_frame(struct mgsl_struct *info)
6737 unsigned int CurrentIndex, NextIndex;
6738 unsigned short status;
6739 DMABUFFERENTRY *pBufEntry;
6740 unsigned int framesize = 0;
6741 bool ReturnCode = false;
6742 unsigned long flags;
6743 struct tty_struct *tty = info->port.tty;
6746 * current_rx_buffer points to the 1st buffer of the next available
6747 * receive frame. The status field is set by the 16C32 after
6748 * completing a receive frame. If the status field of this buffer
6749 * is zero, either the USC is still filling this buffer or this
6750 * is one of a series of buffers making up a received frame.
6752 * If the count field of this buffer is zero, the USC is either
6753 * using this buffer or has used this buffer. Look at the count
6754 * field of the next buffer. If that next buffer's count is
6755 * non-zero, the USC is still actively using the current buffer.
6756 * Otherwise, if the next buffer's count field is zero, the
6757 * current buffer is complete and the USC is using the next
6760 CurrentIndex = NextIndex = info->current_rx_buffer;
6762 if ( NextIndex == info->rx_buffer_count )
6765 if ( info->rx_buffer_list[CurrentIndex].status != 0 ||
6766 (info->rx_buffer_list[CurrentIndex].count == 0 &&
6767 info->rx_buffer_list[NextIndex].count == 0)) {
6769 * Either the status field of this dma buffer is non-zero
6770 * (indicating the last buffer of a receive frame) or the next
6771 * buffer is marked as in use -- implying this buffer is complete
6772 * and an intermediate buffer for this received frame.
6775 status = info->rx_buffer_list[CurrentIndex].status;
6777 if ( status & (RXSTATUS_SHORT_FRAME + RXSTATUS_OVERRUN +
6778 RXSTATUS_CRC_ERROR + RXSTATUS_ABORT) ) {
6779 if ( status & RXSTATUS_SHORT_FRAME )
6780 info->icount.rxshort++;
6781 else if ( status & RXSTATUS_ABORT )
6782 info->icount.rxabort++;
6783 else if ( status & RXSTATUS_OVERRUN )
6784 info->icount.rxover++;
6786 info->icount.rxcrc++;
6790 * A receive frame is available, get frame size and status.
6792 * The frame size is the starting value of the RCC (which was
6793 * set to 0xffff) minus the ending value of the RCC (decremented
6794 * once for each receive character) minus 2 or 4 for the 16-bit
6797 * If the status field is zero, this is an intermediate buffer.
6800 * If the DMA Buffer Entry's Status field is non-zero, the
6801 * receive operation completed normally (ie: DCD dropped). The
6802 * RCC field is valid and holds the received frame size.
6803 * It is possible that the RCC field will be zero on a DMA buffer
6804 * entry with a non-zero status. This can occur if the total
6805 * frame size (number of bytes between the time DCD goes active
6806 * to the time DCD goes inactive) exceeds 65535 bytes. In this
6807 * case the 16C32 has underrun on the RCC count and appears to
6808 * stop updating this counter to let us know the actual received
6809 * frame size. If this happens (non-zero status and zero RCC),
6810 * simply return the entire RxDMA Buffer
6814 * In the event that the final RxDMA Buffer is
6815 * terminated with a non-zero status and the RCC
6816 * field is zero, we interpret this as the RCC
6817 * having underflowed (received frame > 65535 bytes).
6819 * Signal the event to the user by passing back
6820 * a status of RxStatus_CrcError returning the full
6821 * buffer and let the app figure out what data is
6824 if ( info->rx_buffer_list[CurrentIndex].rcc )
6825 framesize = RCLRVALUE - info->rx_buffer_list[CurrentIndex].rcc;
6827 framesize = DMABUFFERSIZE;
6830 framesize = DMABUFFERSIZE;
6833 if ( framesize > DMABUFFERSIZE ) {
6835 * if running in raw sync mode, ISR handler for
6836 * End Of Buffer events terminates all buffers at 4K.
6837 * If this frame size is said to be >4K, get the
6838 * actual number of bytes of the frame in this buffer.
6840 framesize = framesize % DMABUFFERSIZE;
6844 if ( debug_level >= DEBUG_LEVEL_BH )
6845 printk("%s(%d):mgsl_get_raw_rx_frame(%s) status=%04X size=%d\n",
6846 __FILE__,__LINE__,info->device_name,status,framesize);
6848 if ( debug_level >= DEBUG_LEVEL_DATA )
6849 mgsl_trace_block(info,info->rx_buffer_list[CurrentIndex].virt_addr,
6850 min_t(int, framesize, DMABUFFERSIZE),0);
6853 /* copy dma buffer(s) to contiguous intermediate buffer */
6854 /* NOTE: we never copy more than DMABUFFERSIZE bytes */
6856 pBufEntry = &(info->rx_buffer_list[CurrentIndex]);
6857 memcpy( info->intermediate_rxbuffer, pBufEntry->virt_addr, framesize);
6858 info->icount.rxok++;
6860 ldisc_receive_buf(tty, info->intermediate_rxbuffer, info->flag_buf, framesize);
6863 /* Free the buffers used by this frame. */
6864 mgsl_free_rx_frame_buffers( info, CurrentIndex, CurrentIndex );
6870 if ( info->rx_enabled && info->rx_overflow ) {
6871 /* The receiver needs to restarted because of
6872 * a receive overflow (buffer or FIFO). If the
6873 * receive buffers are now empty, then restart receiver.
6876 if ( !info->rx_buffer_list[CurrentIndex].status &&
6877 info->rx_buffer_list[CurrentIndex].count ) {
6878 spin_lock_irqsave(&info->irq_spinlock,flags);
6879 usc_start_receiver(info);
6880 spin_unlock_irqrestore(&info->irq_spinlock,flags);
6886 } /* end of mgsl_get_raw_rx_frame() */
6888 /* mgsl_load_tx_dma_buffer()
6890 * Load the transmit DMA buffer with the specified data.
6894 * info pointer to device extension
6895 * Buffer pointer to buffer containing frame to load
6896 * BufferSize size in bytes of frame in Buffer
6898 * Return Value: None
6900 static void mgsl_load_tx_dma_buffer(struct mgsl_struct *info,
6901 const char *Buffer, unsigned int BufferSize)
6903 unsigned short Copycount;
6905 DMABUFFERENTRY *pBufEntry;
6907 if ( debug_level >= DEBUG_LEVEL_DATA )
6908 mgsl_trace_block(info,Buffer, min_t(int, BufferSize, DMABUFFERSIZE), 1);
6910 if (info->params.flags & HDLC_FLAG_HDLC_LOOPMODE) {
6911 /* set CMR:13 to start transmit when
6912 * next GoAhead (abort) is received
6914 info->cmr_value |= BIT13;
6917 /* begin loading the frame in the next available tx dma
6918 * buffer, remember it's starting location for setting
6919 * up tx dma operation
6921 i = info->current_tx_buffer;
6922 info->start_tx_dma_buffer = i;
6924 /* Setup the status and RCC (Frame Size) fields of the 1st */
6925 /* buffer entry in the transmit DMA buffer list. */
6927 info->tx_buffer_list[i].status = info->cmr_value & 0xf000;
6928 info->tx_buffer_list[i].rcc = BufferSize;
6929 info->tx_buffer_list[i].count = BufferSize;
6931 /* Copy frame data from 1st source buffer to the DMA buffers. */
6932 /* The frame data may span multiple DMA buffers. */
6934 while( BufferSize ){
6935 /* Get a pointer to next DMA buffer entry. */
6936 pBufEntry = &info->tx_buffer_list[i++];
6938 if ( i == info->tx_buffer_count )
6941 /* Calculate the number of bytes that can be copied from */
6942 /* the source buffer to this DMA buffer. */
6943 if ( BufferSize > DMABUFFERSIZE )
6944 Copycount = DMABUFFERSIZE;
6946 Copycount = BufferSize;
6948 /* Actually copy data from source buffer to DMA buffer. */
6949 /* Also set the data count for this individual DMA buffer. */
6950 if ( info->bus_type == MGSL_BUS_TYPE_PCI )
6951 mgsl_load_pci_memory(pBufEntry->virt_addr, Buffer,Copycount);
6953 memcpy(pBufEntry->virt_addr, Buffer, Copycount);
6955 pBufEntry->count = Copycount;
6957 /* Advance source pointer and reduce remaining data count. */
6958 Buffer += Copycount;
6959 BufferSize -= Copycount;
6961 ++info->tx_dma_buffers_used;
6964 /* remember next available tx dma buffer */
6965 info->current_tx_buffer = i;
6967 } /* end of mgsl_load_tx_dma_buffer() */
6970 * mgsl_register_test()
6972 * Performs a register test of the 16C32.
6974 * Arguments: info pointer to device instance data
6975 * Return Value: true if test passed, otherwise false
6977 static bool mgsl_register_test( struct mgsl_struct *info )
6979 static unsigned short BitPatterns[] =
6980 { 0x0000, 0xffff, 0xaaaa, 0x5555, 0x1234, 0x6969, 0x9696, 0x0f0f };
6981 static unsigned int Patterncount = ARRAY_SIZE(BitPatterns);
6984 unsigned long flags;
6986 spin_lock_irqsave(&info->irq_spinlock,flags);
6989 /* Verify the reset state of some registers. */
6991 if ( (usc_InReg( info, SICR ) != 0) ||
6992 (usc_InReg( info, IVR ) != 0) ||
6993 (usc_InDmaReg( info, DIVR ) != 0) ){
6998 /* Write bit patterns to various registers but do it out of */
6999 /* sync, then read back and verify values. */
7001 for ( i = 0 ; i < Patterncount ; i++ ) {
7002 usc_OutReg( info, TC0R, BitPatterns[i] );
7003 usc_OutReg( info, TC1R, BitPatterns[(i+1)%Patterncount] );
7004 usc_OutReg( info, TCLR, BitPatterns[(i+2)%Patterncount] );
7005 usc_OutReg( info, RCLR, BitPatterns[(i+3)%Patterncount] );
7006 usc_OutReg( info, RSR, BitPatterns[(i+4)%Patterncount] );
7007 usc_OutDmaReg( info, TBCR, BitPatterns[(i+5)%Patterncount] );
7009 if ( (usc_InReg( info, TC0R ) != BitPatterns[i]) ||
7010 (usc_InReg( info, TC1R ) != BitPatterns[(i+1)%Patterncount]) ||
7011 (usc_InReg( info, TCLR ) != BitPatterns[(i+2)%Patterncount]) ||
7012 (usc_InReg( info, RCLR ) != BitPatterns[(i+3)%Patterncount]) ||
7013 (usc_InReg( info, RSR ) != BitPatterns[(i+4)%Patterncount]) ||
7014 (usc_InDmaReg( info, TBCR ) != BitPatterns[(i+5)%Patterncount]) ){
7022 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7026 } /* end of mgsl_register_test() */
7028 /* mgsl_irq_test() Perform interrupt test of the 16C32.
7030 * Arguments: info pointer to device instance data
7031 * Return Value: true if test passed, otherwise false
7033 static bool mgsl_irq_test( struct mgsl_struct *info )
7035 unsigned long EndTime;
7036 unsigned long flags;
7038 spin_lock_irqsave(&info->irq_spinlock,flags);
7042 * Setup 16C32 to interrupt on TxC pin (14MHz clock) transition.
7043 * The ISR sets irq_occurred to true.
7046 info->irq_occurred = false;
7048 /* Enable INTEN gate for ISA adapter (Port 6, Bit12) */
7049 /* Enable INTEN (Port 6, Bit12) */
7050 /* This connects the IRQ request signal to the ISA bus */
7051 /* on the ISA adapter. This has no effect for the PCI adapter */
7052 usc_OutReg( info, PCR, (unsigned short)((usc_InReg(info, PCR) | BIT13) & ~BIT12) );
7054 usc_EnableMasterIrqBit(info);
7055 usc_EnableInterrupts(info, IO_PIN);
7056 usc_ClearIrqPendingBits(info, IO_PIN);
7058 usc_UnlatchIostatusBits(info, MISCSTATUS_TXC_LATCHED);
7059 usc_EnableStatusIrqs(info, SICR_TXC_ACTIVE + SICR_TXC_INACTIVE);
7061 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7064 while( EndTime-- && !info->irq_occurred ) {
7065 msleep_interruptible(10);
7068 spin_lock_irqsave(&info->irq_spinlock,flags);
7070 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7072 return info->irq_occurred;
7074 } /* end of mgsl_irq_test() */
7078 * Perform a DMA test of the 16C32. A small frame is
7079 * transmitted via DMA from a transmit buffer to a receive buffer
7080 * using single buffer DMA mode.
7082 * Arguments: info pointer to device instance data
7083 * Return Value: true if test passed, otherwise false
7085 static bool mgsl_dma_test( struct mgsl_struct *info )
7087 unsigned short FifoLevel;
7088 unsigned long phys_addr;
7089 unsigned int FrameSize;
7093 unsigned short status=0;
7094 unsigned long EndTime;
7095 unsigned long flags;
7096 MGSL_PARAMS tmp_params;
7098 /* save current port options */
7099 memcpy(&tmp_params,&info->params,sizeof(MGSL_PARAMS));
7100 /* load default port options */
7101 memcpy(&info->params,&default_params,sizeof(MGSL_PARAMS));
7103 #define TESTFRAMESIZE 40
7105 spin_lock_irqsave(&info->irq_spinlock,flags);
7107 /* setup 16C32 for SDLC DMA transfer mode */
7110 usc_set_sdlc_mode(info);
7111 usc_enable_loopback(info,1);
7113 /* Reprogram the RDMR so that the 16C32 does NOT clear the count
7114 * field of the buffer entry after fetching buffer address. This
7115 * way we can detect a DMA failure for a DMA read (which should be
7116 * non-destructive to system memory) before we try and write to
7117 * memory (where a failure could corrupt system memory).
7120 /* Receive DMA mode Register (RDMR)
7122 * <15..14> 11 DMA mode = Linked List Buffer mode
7123 * <13> 1 RSBinA/L = store Rx status Block in List entry
7124 * <12> 0 1 = Clear count of List Entry after fetching
7125 * <11..10> 00 Address mode = Increment
7126 * <9> 1 Terminate Buffer on RxBound
7127 * <8> 0 Bus Width = 16bits
7128 * <7..0> ? status Bits (write as 0s)
7130 * 1110 0010 0000 0000 = 0xe200
7133 usc_OutDmaReg( info, RDMR, 0xe200 );
7135 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7138 /* SETUP TRANSMIT AND RECEIVE DMA BUFFERS */
7140 FrameSize = TESTFRAMESIZE;
7142 /* setup 1st transmit buffer entry: */
7143 /* with frame size and transmit control word */
7145 info->tx_buffer_list[0].count = FrameSize;
7146 info->tx_buffer_list[0].rcc = FrameSize;
7147 info->tx_buffer_list[0].status = 0x4000;
7149 /* build a transmit frame in 1st transmit DMA buffer */
7151 TmpPtr = info->tx_buffer_list[0].virt_addr;
7152 for (i = 0; i < FrameSize; i++ )
7155 /* setup 1st receive buffer entry: */
7156 /* clear status, set max receive buffer size */
7158 info->rx_buffer_list[0].status = 0;
7159 info->rx_buffer_list[0].count = FrameSize + 4;
7161 /* zero out the 1st receive buffer */
7163 memset( info->rx_buffer_list[0].virt_addr, 0, FrameSize + 4 );
7165 /* Set count field of next buffer entries to prevent */
7166 /* 16C32 from using buffers after the 1st one. */
7168 info->tx_buffer_list[1].count = 0;
7169 info->rx_buffer_list[1].count = 0;
7172 /***************************/
7173 /* Program 16C32 receiver. */
7174 /***************************/
7176 spin_lock_irqsave(&info->irq_spinlock,flags);
7178 /* setup DMA transfers */
7179 usc_RTCmd( info, RTCmd_PurgeRxFifo );
7181 /* program 16C32 receiver with physical address of 1st DMA buffer entry */
7182 phys_addr = info->rx_buffer_list[0].phys_entry;
7183 usc_OutDmaReg( info, NRARL, (unsigned short)phys_addr );
7184 usc_OutDmaReg( info, NRARU, (unsigned short)(phys_addr >> 16) );
7186 /* Clear the Rx DMA status bits (read RDMR) and start channel */
7187 usc_InDmaReg( info, RDMR );
7188 usc_DmaCmd( info, DmaCmd_InitRxChannel );
7190 /* Enable Receiver (RMR <1..0> = 10) */
7191 usc_OutReg( info, RMR, (unsigned short)((usc_InReg(info, RMR) & 0xfffc) | 0x0002) );
7193 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7196 /*************************************************************/
7197 /* WAIT FOR RECEIVER TO DMA ALL PARAMETERS FROM BUFFER ENTRY */
7198 /*************************************************************/
7200 /* Wait 100ms for interrupt. */
7201 EndTime = jiffies + msecs_to_jiffies(100);
7204 if (time_after(jiffies, EndTime)) {
7209 spin_lock_irqsave(&info->irq_spinlock,flags);
7210 status = usc_InDmaReg( info, RDMR );
7211 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7213 if ( !(status & BIT4) && (status & BIT5) ) {
7214 /* INITG (BIT 4) is inactive (no entry read in progress) AND */
7215 /* BUSY (BIT 5) is active (channel still active). */
7216 /* This means the buffer entry read has completed. */
7222 /******************************/
7223 /* Program 16C32 transmitter. */
7224 /******************************/
7226 spin_lock_irqsave(&info->irq_spinlock,flags);
7228 /* Program the Transmit Character Length Register (TCLR) */
7229 /* and clear FIFO (TCC is loaded with TCLR on FIFO clear) */
7231 usc_OutReg( info, TCLR, (unsigned short)info->tx_buffer_list[0].count );
7232 usc_RTCmd( info, RTCmd_PurgeTxFifo );
7234 /* Program the address of the 1st DMA Buffer Entry in linked list */
7236 phys_addr = info->tx_buffer_list[0].phys_entry;
7237 usc_OutDmaReg( info, NTARL, (unsigned short)phys_addr );
7238 usc_OutDmaReg( info, NTARU, (unsigned short)(phys_addr >> 16) );
7240 /* unlatch Tx status bits, and start transmit channel. */
7242 usc_OutReg( info, TCSR, (unsigned short)(( usc_InReg(info, TCSR) & 0x0f00) | 0xfa) );
7243 usc_DmaCmd( info, DmaCmd_InitTxChannel );
7245 /* wait for DMA controller to fill transmit FIFO */
7247 usc_TCmd( info, TCmd_SelectTicrTxFifostatus );
7249 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7252 /**********************************/
7253 /* WAIT FOR TRANSMIT FIFO TO FILL */
7254 /**********************************/
7257 EndTime = jiffies + msecs_to_jiffies(100);
7260 if (time_after(jiffies, EndTime)) {
7265 spin_lock_irqsave(&info->irq_spinlock,flags);
7266 FifoLevel = usc_InReg(info, TICR) >> 8;
7267 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7269 if ( FifoLevel < 16 )
7272 if ( FrameSize < 32 ) {
7273 /* This frame is smaller than the entire transmit FIFO */
7274 /* so wait for the entire frame to be loaded. */
7275 if ( FifoLevel <= (32 - FrameSize) )
7283 /* Enable 16C32 transmitter. */
7285 spin_lock_irqsave(&info->irq_spinlock,flags);
7287 /* Transmit mode Register (TMR), <1..0> = 10, Enable Transmitter */
7288 usc_TCmd( info, TCmd_SendFrame );
7289 usc_OutReg( info, TMR, (unsigned short)((usc_InReg(info, TMR) & 0xfffc) | 0x0002) );
7291 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7294 /******************************/
7295 /* WAIT FOR TRANSMIT COMPLETE */
7296 /******************************/
7299 EndTime = jiffies + msecs_to_jiffies(100);
7301 /* While timer not expired wait for transmit complete */
7303 spin_lock_irqsave(&info->irq_spinlock,flags);
7304 status = usc_InReg( info, TCSR );
7305 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7307 while ( !(status & (BIT6+BIT5+BIT4+BIT2+BIT1)) ) {
7308 if (time_after(jiffies, EndTime)) {
7313 spin_lock_irqsave(&info->irq_spinlock,flags);
7314 status = usc_InReg( info, TCSR );
7315 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7321 /* CHECK FOR TRANSMIT ERRORS */
7322 if ( status & (BIT5 + BIT1) )
7327 /* WAIT FOR RECEIVE COMPLETE */
7330 EndTime = jiffies + msecs_to_jiffies(100);
7332 /* Wait for 16C32 to write receive status to buffer entry. */
7333 status=info->rx_buffer_list[0].status;
7334 while ( status == 0 ) {
7335 if (time_after(jiffies, EndTime)) {
7339 status=info->rx_buffer_list[0].status;
7345 /* CHECK FOR RECEIVE ERRORS */
7346 status = info->rx_buffer_list[0].status;
7348 if ( status & (BIT8 + BIT3 + BIT1) ) {
7349 /* receive error has occurred */
7352 if ( memcmp( info->tx_buffer_list[0].virt_addr ,
7353 info->rx_buffer_list[0].virt_addr, FrameSize ) ){
7359 spin_lock_irqsave(&info->irq_spinlock,flags);
7361 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7363 /* restore current port options */
7364 memcpy(&info->params,&tmp_params,sizeof(MGSL_PARAMS));
7368 } /* end of mgsl_dma_test() */
7370 /* mgsl_adapter_test()
7372 * Perform the register, IRQ, and DMA tests for the 16C32.
7374 * Arguments: info pointer to device instance data
7375 * Return Value: 0 if success, otherwise -ENODEV
7377 static int mgsl_adapter_test( struct mgsl_struct *info )
7379 if ( debug_level >= DEBUG_LEVEL_INFO )
7380 printk( "%s(%d):Testing device %s\n",
7381 __FILE__,__LINE__,info->device_name );
7383 if ( !mgsl_register_test( info ) ) {
7384 info->init_error = DiagStatus_AddressFailure;
7385 printk( "%s(%d):Register test failure for device %s Addr=%04X\n",
7386 __FILE__,__LINE__,info->device_name, (unsigned short)(info->io_base) );
7390 if ( !mgsl_irq_test( info ) ) {
7391 info->init_error = DiagStatus_IrqFailure;
7392 printk( "%s(%d):Interrupt test failure for device %s IRQ=%d\n",
7393 __FILE__,__LINE__,info->device_name, (unsigned short)(info->irq_level) );
7397 if ( !mgsl_dma_test( info ) ) {
7398 info->init_error = DiagStatus_DmaFailure;
7399 printk( "%s(%d):DMA test failure for device %s DMA=%d\n",
7400 __FILE__,__LINE__,info->device_name, (unsigned short)(info->dma_level) );
7404 if ( debug_level >= DEBUG_LEVEL_INFO )
7405 printk( "%s(%d):device %s passed diagnostics\n",
7406 __FILE__,__LINE__,info->device_name );
7410 } /* end of mgsl_adapter_test() */
7412 /* mgsl_memory_test()
7414 * Test the shared memory on a PCI adapter.
7416 * Arguments: info pointer to device instance data
7417 * Return Value: true if test passed, otherwise false
7419 static bool mgsl_memory_test( struct mgsl_struct *info )
7421 static unsigned long BitPatterns[] =
7422 { 0x0, 0x55555555, 0xaaaaaaaa, 0x66666666, 0x99999999, 0xffffffff, 0x12345678 };
7423 unsigned long Patterncount = ARRAY_SIZE(BitPatterns);
7425 unsigned long TestLimit = SHARED_MEM_ADDRESS_SIZE/sizeof(unsigned long);
7426 unsigned long * TestAddr;
7428 if ( info->bus_type != MGSL_BUS_TYPE_PCI )
7431 TestAddr = (unsigned long *)info->memory_base;
7433 /* Test data lines with test pattern at one location. */
7435 for ( i = 0 ; i < Patterncount ; i++ ) {
7436 *TestAddr = BitPatterns[i];
7437 if ( *TestAddr != BitPatterns[i] )
7441 /* Test address lines with incrementing pattern over */
7442 /* entire address range. */
7444 for ( i = 0 ; i < TestLimit ; i++ ) {
7449 TestAddr = (unsigned long *)info->memory_base;
7451 for ( i = 0 ; i < TestLimit ; i++ ) {
7452 if ( *TestAddr != i * 4 )
7457 memset( info->memory_base, 0, SHARED_MEM_ADDRESS_SIZE );
7461 } /* End Of mgsl_memory_test() */
7464 /* mgsl_load_pci_memory()
7466 * Load a large block of data into the PCI shared memory.
7467 * Use this instead of memcpy() or memmove() to move data
7468 * into the PCI shared memory.
7472 * This function prevents the PCI9050 interface chip from hogging
7473 * the adapter local bus, which can starve the 16C32 by preventing
7474 * 16C32 bus master cycles.
7476 * The PCI9050 documentation says that the 9050 will always release
7477 * control of the local bus after completing the current read
7478 * or write operation.
7480 * It appears that as long as the PCI9050 write FIFO is full, the
7481 * PCI9050 treats all of the writes as a single burst transaction
7482 * and will not release the bus. This causes DMA latency problems
7483 * at high speeds when copying large data blocks to the shared
7486 * This function in effect, breaks the a large shared memory write
7487 * into multiple transations by interleaving a shared memory read
7488 * which will flush the write FIFO and 'complete' the write
7489 * transation. This allows any pending DMA request to gain control
7490 * of the local bus in a timely fasion.
7494 * TargetPtr pointer to target address in PCI shared memory
7495 * SourcePtr pointer to source buffer for data
7496 * count count in bytes of data to copy
7498 * Return Value: None
7500 static void mgsl_load_pci_memory( char* TargetPtr, const char* SourcePtr,
7501 unsigned short count )
7503 /* 16 32-bit writes @ 60ns each = 960ns max latency on local bus */
7504 #define PCI_LOAD_INTERVAL 64
7506 unsigned short Intervalcount = count / PCI_LOAD_INTERVAL;
7507 unsigned short Index;
7508 unsigned long Dummy;
7510 for ( Index = 0 ; Index < Intervalcount ; Index++ )
7512 memcpy(TargetPtr, SourcePtr, PCI_LOAD_INTERVAL);
7513 Dummy = *((volatile unsigned long *)TargetPtr);
7514 TargetPtr += PCI_LOAD_INTERVAL;
7515 SourcePtr += PCI_LOAD_INTERVAL;
7518 memcpy( TargetPtr, SourcePtr, count % PCI_LOAD_INTERVAL );
7520 } /* End Of mgsl_load_pci_memory() */
7522 static void mgsl_trace_block(struct mgsl_struct *info,const char* data, int count, int xmit)
7527 printk("%s tx data:\n",info->device_name);
7529 printk("%s rx data:\n",info->device_name);
7537 for(i=0;i<linecount;i++)
7538 printk("%02X ",(unsigned char)data[i]);
7541 for(i=0;i<linecount;i++) {
7542 if (data[i]>=040 && data[i]<=0176)
7543 printk("%c",data[i]);
7552 } /* end of mgsl_trace_block() */
7554 /* mgsl_tx_timeout()
7556 * called when HDLC frame times out
7557 * update stats and do tx completion processing
7559 * Arguments: context pointer to device instance data
7560 * Return Value: None
7562 static void mgsl_tx_timeout(unsigned long context)
7564 struct mgsl_struct *info = (struct mgsl_struct*)context;
7565 unsigned long flags;
7567 if ( debug_level >= DEBUG_LEVEL_INFO )
7568 printk( "%s(%d):mgsl_tx_timeout(%s)\n",
7569 __FILE__,__LINE__,info->device_name);
7570 if(info->tx_active &&
7571 (info->params.mode == MGSL_MODE_HDLC ||
7572 info->params.mode == MGSL_MODE_RAW) ) {
7573 info->icount.txtimeout++;
7575 spin_lock_irqsave(&info->irq_spinlock,flags);
7576 info->tx_active = false;
7577 info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
7579 if ( info->params.flags & HDLC_FLAG_HDLC_LOOPMODE )
7580 usc_loopmode_cancel_transmit( info );
7582 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7584 #if SYNCLINK_GENERIC_HDLC
7586 hdlcdev_tx_done(info);
7589 mgsl_bh_transmit(info);
7591 } /* end of mgsl_tx_timeout() */
7593 /* signal that there are no more frames to send, so that
7594 * line is 'released' by echoing RxD to TxD when current
7595 * transmission is complete (or immediately if no tx in progress).
7597 static int mgsl_loopmode_send_done( struct mgsl_struct * info )
7599 unsigned long flags;
7601 spin_lock_irqsave(&info->irq_spinlock,flags);
7602 if (info->params.flags & HDLC_FLAG_HDLC_LOOPMODE) {
7603 if (info->tx_active)
7604 info->loopmode_send_done_requested = true;
7606 usc_loopmode_send_done(info);
7608 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7613 /* release the line by echoing RxD to TxD
7614 * upon completion of a transmit frame
7616 static void usc_loopmode_send_done( struct mgsl_struct * info )
7618 info->loopmode_send_done_requested = false;
7619 /* clear CMR:13 to 0 to start echoing RxData to TxData */
7620 info->cmr_value &= ~BIT13;
7621 usc_OutReg(info, CMR, info->cmr_value);
7624 /* abort a transmit in progress while in HDLC LoopMode
7626 static void usc_loopmode_cancel_transmit( struct mgsl_struct * info )
7628 /* reset tx dma channel and purge TxFifo */
7629 usc_RTCmd( info, RTCmd_PurgeTxFifo );
7630 usc_DmaCmd( info, DmaCmd_ResetTxChannel );
7631 usc_loopmode_send_done( info );
7634 /* for HDLC/SDLC LoopMode, setting CMR:13 after the transmitter is enabled
7635 * is an Insert Into Loop action. Upon receipt of a GoAhead sequence (RxAbort)
7636 * we must clear CMR:13 to begin repeating TxData to RxData
7638 static void usc_loopmode_insert_request( struct mgsl_struct * info )
7640 info->loopmode_insert_requested = true;
7642 /* enable RxAbort irq. On next RxAbort, clear CMR:13 to
7643 * begin repeating TxData on RxData (complete insertion)
7645 usc_OutReg( info, RICR,
7646 (usc_InReg( info, RICR ) | RXSTATUS_ABORT_RECEIVED ) );
7648 /* set CMR:13 to insert into loop on next GoAhead (RxAbort) */
7649 info->cmr_value |= BIT13;
7650 usc_OutReg(info, CMR, info->cmr_value);
7653 /* return 1 if station is inserted into the loop, otherwise 0
7655 static int usc_loopmode_active( struct mgsl_struct * info)
7657 return usc_InReg( info, CCSR ) & BIT7 ? 1 : 0 ;
7660 #if SYNCLINK_GENERIC_HDLC
7663 * called by generic HDLC layer when protocol selected (PPP, frame relay, etc.)
7664 * set encoding and frame check sequence (FCS) options
7666 * dev pointer to network device structure
7667 * encoding serial encoding setting
7668 * parity FCS setting
7670 * returns 0 if success, otherwise error code
7672 static int hdlcdev_attach(struct net_device *dev, unsigned short encoding,
7673 unsigned short parity)
7675 struct mgsl_struct *info = dev_to_port(dev);
7676 unsigned char new_encoding;
7677 unsigned short new_crctype;
7679 /* return error if TTY interface open */
7680 if (info->port.count)
7685 case ENCODING_NRZ: new_encoding = HDLC_ENCODING_NRZ; break;
7686 case ENCODING_NRZI: new_encoding = HDLC_ENCODING_NRZI_SPACE; break;
7687 case ENCODING_FM_MARK: new_encoding = HDLC_ENCODING_BIPHASE_MARK; break;
7688 case ENCODING_FM_SPACE: new_encoding = HDLC_ENCODING_BIPHASE_SPACE; break;
7689 case ENCODING_MANCHESTER: new_encoding = HDLC_ENCODING_BIPHASE_LEVEL; break;
7690 default: return -EINVAL;
7695 case PARITY_NONE: new_crctype = HDLC_CRC_NONE; break;
7696 case PARITY_CRC16_PR1_CCITT: new_crctype = HDLC_CRC_16_CCITT; break;
7697 case PARITY_CRC32_PR1_CCITT: new_crctype = HDLC_CRC_32_CCITT; break;
7698 default: return -EINVAL;
7701 info->params.encoding = new_encoding;
7702 info->params.crc_type = new_crctype;
7704 /* if network interface up, reprogram hardware */
7706 mgsl_program_hw(info);
7712 * called by generic HDLC layer to send frame
7714 * skb socket buffer containing HDLC frame
7715 * dev pointer to network device structure
7717 * returns 0 if success, otherwise error code
7719 static int hdlcdev_xmit(struct sk_buff *skb, struct net_device *dev)
7721 struct mgsl_struct *info = dev_to_port(dev);
7722 unsigned long flags;
7724 if (debug_level >= DEBUG_LEVEL_INFO)
7725 printk(KERN_INFO "%s:hdlc_xmit(%s)\n",__FILE__,dev->name);
7727 /* stop sending until this frame completes */
7728 netif_stop_queue(dev);
7730 /* copy data to device buffers */
7731 info->xmit_cnt = skb->len;
7732 mgsl_load_tx_dma_buffer(info, skb->data, skb->len);
7734 /* update network statistics */
7735 dev->stats.tx_packets++;
7736 dev->stats.tx_bytes += skb->len;
7738 /* done with socket buffer, so free it */
7741 /* save start time for transmit timeout detection */
7742 dev->trans_start = jiffies;
7744 /* start hardware transmitter if necessary */
7745 spin_lock_irqsave(&info->irq_spinlock,flags);
7746 if (!info->tx_active)
7747 usc_start_transmitter(info);
7748 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7754 * called by network layer when interface enabled
7755 * claim resources and initialize hardware
7757 * dev pointer to network device structure
7759 * returns 0 if success, otherwise error code
7761 static int hdlcdev_open(struct net_device *dev)
7763 struct mgsl_struct *info = dev_to_port(dev);
7765 unsigned long flags;
7767 if (debug_level >= DEBUG_LEVEL_INFO)
7768 printk("%s:hdlcdev_open(%s)\n",__FILE__,dev->name);
7770 /* generic HDLC layer open processing */
7771 if ((rc = hdlc_open(dev)))
7774 /* arbitrate between network and tty opens */
7775 spin_lock_irqsave(&info->netlock, flags);
7776 if (info->port.count != 0 || info->netcount != 0) {
7777 printk(KERN_WARNING "%s: hdlc_open returning busy\n", dev->name);
7778 spin_unlock_irqrestore(&info->netlock, flags);
7782 spin_unlock_irqrestore(&info->netlock, flags);
7784 /* claim resources and init adapter */
7785 if ((rc = startup(info)) != 0) {
7786 spin_lock_irqsave(&info->netlock, flags);
7788 spin_unlock_irqrestore(&info->netlock, flags);
7792 /* assert DTR and RTS, apply hardware settings */
7793 info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
7794 mgsl_program_hw(info);
7796 /* enable network layer transmit */
7797 dev->trans_start = jiffies;
7798 netif_start_queue(dev);
7800 /* inform generic HDLC layer of current DCD status */
7801 spin_lock_irqsave(&info->irq_spinlock, flags);
7802 usc_get_serial_signals(info);
7803 spin_unlock_irqrestore(&info->irq_spinlock, flags);
7804 if (info->serial_signals & SerialSignal_DCD)
7805 netif_carrier_on(dev);
7807 netif_carrier_off(dev);
7812 * called by network layer when interface is disabled
7813 * shutdown hardware and release resources
7815 * dev pointer to network device structure
7817 * returns 0 if success, otherwise error code
7819 static int hdlcdev_close(struct net_device *dev)
7821 struct mgsl_struct *info = dev_to_port(dev);
7822 unsigned long flags;
7824 if (debug_level >= DEBUG_LEVEL_INFO)
7825 printk("%s:hdlcdev_close(%s)\n",__FILE__,dev->name);
7827 netif_stop_queue(dev);
7829 /* shutdown adapter and release resources */
7834 spin_lock_irqsave(&info->netlock, flags);
7836 spin_unlock_irqrestore(&info->netlock, flags);
7842 * called by network layer to process IOCTL call to network device
7844 * dev pointer to network device structure
7845 * ifr pointer to network interface request structure
7846 * cmd IOCTL command code
7848 * returns 0 if success, otherwise error code
7850 static int hdlcdev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
7852 const size_t size = sizeof(sync_serial_settings);
7853 sync_serial_settings new_line;
7854 sync_serial_settings __user *line = ifr->ifr_settings.ifs_ifsu.sync;
7855 struct mgsl_struct *info = dev_to_port(dev);
7858 if (debug_level >= DEBUG_LEVEL_INFO)
7859 printk("%s:hdlcdev_ioctl(%s)\n",__FILE__,dev->name);
7861 /* return error if TTY interface open */
7862 if (info->port.count)
7865 if (cmd != SIOCWANDEV)
7866 return hdlc_ioctl(dev, ifr, cmd);
7868 switch(ifr->ifr_settings.type) {
7869 case IF_GET_IFACE: /* return current sync_serial_settings */
7871 ifr->ifr_settings.type = IF_IFACE_SYNC_SERIAL;
7872 if (ifr->ifr_settings.size < size) {
7873 ifr->ifr_settings.size = size; /* data size wanted */
7877 flags = info->params.flags & (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
7878 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
7879 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
7880 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN);
7883 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN): new_line.clock_type = CLOCK_EXT; break;
7884 case (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG): new_line.clock_type = CLOCK_INT; break;
7885 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG): new_line.clock_type = CLOCK_TXINT; break;
7886 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN): new_line.clock_type = CLOCK_TXFROMRX; break;
7887 default: new_line.clock_type = CLOCK_DEFAULT;
7890 new_line.clock_rate = info->params.clock_speed;
7891 new_line.loopback = info->params.loopback ? 1:0;
7893 if (copy_to_user(line, &new_line, size))
7897 case IF_IFACE_SYNC_SERIAL: /* set sync_serial_settings */
7899 if(!capable(CAP_NET_ADMIN))
7901 if (copy_from_user(&new_line, line, size))
7904 switch (new_line.clock_type)
7906 case CLOCK_EXT: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN; break;
7907 case CLOCK_TXFROMRX: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN; break;
7908 case CLOCK_INT: flags = HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG; break;
7909 case CLOCK_TXINT: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG; break;
7910 case CLOCK_DEFAULT: flags = info->params.flags &
7911 (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
7912 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
7913 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
7914 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN); break;
7915 default: return -EINVAL;
7918 if (new_line.loopback != 0 && new_line.loopback != 1)
7921 info->params.flags &= ~(HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
7922 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
7923 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
7924 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN);
7925 info->params.flags |= flags;
7927 info->params.loopback = new_line.loopback;
7929 if (flags & (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG))
7930 info->params.clock_speed = new_line.clock_rate;
7932 info->params.clock_speed = 0;
7934 /* if network interface up, reprogram hardware */
7936 mgsl_program_hw(info);
7940 return hdlc_ioctl(dev, ifr, cmd);
7945 * called by network layer when transmit timeout is detected
7947 * dev pointer to network device structure
7949 static void hdlcdev_tx_timeout(struct net_device *dev)
7951 struct mgsl_struct *info = dev_to_port(dev);
7952 unsigned long flags;
7954 if (debug_level >= DEBUG_LEVEL_INFO)
7955 printk("hdlcdev_tx_timeout(%s)\n",dev->name);
7957 dev->stats.tx_errors++;
7958 dev->stats.tx_aborted_errors++;
7960 spin_lock_irqsave(&info->irq_spinlock,flags);
7961 usc_stop_transmitter(info);
7962 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7964 netif_wake_queue(dev);
7968 * called by device driver when transmit completes
7969 * reenable network layer transmit if stopped
7971 * info pointer to device instance information
7973 static void hdlcdev_tx_done(struct mgsl_struct *info)
7975 if (netif_queue_stopped(info->netdev))
7976 netif_wake_queue(info->netdev);
7980 * called by device driver when frame received
7981 * pass frame to network layer
7983 * info pointer to device instance information
7984 * buf pointer to buffer contianing frame data
7985 * size count of data bytes in buf
7987 static void hdlcdev_rx(struct mgsl_struct *info, char *buf, int size)
7989 struct sk_buff *skb = dev_alloc_skb(size);
7990 struct net_device *dev = info->netdev;
7992 if (debug_level >= DEBUG_LEVEL_INFO)
7993 printk("hdlcdev_rx(%s)\n", dev->name);
7996 printk(KERN_NOTICE "%s: can't alloc skb, dropping packet\n",
7998 dev->stats.rx_dropped++;
8002 memcpy(skb_put(skb, size), buf, size);
8004 skb->protocol = hdlc_type_trans(skb, dev);
8006 dev->stats.rx_packets++;
8007 dev->stats.rx_bytes += size;
8011 dev->last_rx = jiffies;
8015 * called by device driver when adding device instance
8016 * do generic HDLC initialization
8018 * info pointer to device instance information
8020 * returns 0 if success, otherwise error code
8022 static int hdlcdev_init(struct mgsl_struct *info)
8025 struct net_device *dev;
8028 /* allocate and initialize network and HDLC layer objects */
8030 if (!(dev = alloc_hdlcdev(info))) {
8031 printk(KERN_ERR "%s:hdlc device allocation failure\n",__FILE__);
8035 /* for network layer reporting purposes only */
8036 dev->base_addr = info->io_base;
8037 dev->irq = info->irq_level;
8038 dev->dma = info->dma_level;
8040 /* network layer callbacks and settings */
8041 dev->do_ioctl = hdlcdev_ioctl;
8042 dev->open = hdlcdev_open;
8043 dev->stop = hdlcdev_close;
8044 dev->tx_timeout = hdlcdev_tx_timeout;
8045 dev->watchdog_timeo = 10*HZ;
8046 dev->tx_queue_len = 50;
8048 /* generic HDLC layer callbacks and settings */
8049 hdlc = dev_to_hdlc(dev);
8050 hdlc->attach = hdlcdev_attach;
8051 hdlc->xmit = hdlcdev_xmit;
8053 /* register objects with HDLC layer */
8054 if ((rc = register_hdlc_device(dev))) {
8055 printk(KERN_WARNING "%s:unable to register hdlc device\n",__FILE__);
8065 * called by device driver when removing device instance
8066 * do generic HDLC cleanup
8068 * info pointer to device instance information
8070 static void hdlcdev_exit(struct mgsl_struct *info)
8072 unregister_hdlc_device(info->netdev);
8073 free_netdev(info->netdev);
8074 info->netdev = NULL;
8077 #endif /* CONFIG_HDLC */
8080 static int __devinit synclink_init_one (struct pci_dev *dev,
8081 const struct pci_device_id *ent)
8083 struct mgsl_struct *info;
8085 if (pci_enable_device(dev)) {
8086 printk("error enabling pci device %p\n", dev);
8090 if (!(info = mgsl_allocate_device())) {
8091 printk("can't allocate device instance data.\n");
8095 /* Copy user configuration info to device instance data */
8097 info->io_base = pci_resource_start(dev, 2);
8098 info->irq_level = dev->irq;
8099 info->phys_memory_base = pci_resource_start(dev, 3);
8101 /* Because veremap only works on page boundaries we must map
8102 * a larger area than is actually implemented for the LCR
8103 * memory range. We map a full page starting at the page boundary.
8105 info->phys_lcr_base = pci_resource_start(dev, 0);
8106 info->lcr_offset = info->phys_lcr_base & (PAGE_SIZE-1);
8107 info->phys_lcr_base &= ~(PAGE_SIZE-1);
8109 info->bus_type = MGSL_BUS_TYPE_PCI;
8110 info->io_addr_size = 8;
8111 info->irq_flags = IRQF_SHARED;
8113 if (dev->device == 0x0210) {
8114 /* Version 1 PCI9030 based universal PCI adapter */
8115 info->misc_ctrl_value = 0x007c4080;
8116 info->hw_version = 1;
8118 /* Version 0 PCI9050 based 5V PCI adapter
8119 * A PCI9050 bug prevents reading LCR registers if
8120 * LCR base address bit 7 is set. Maintain shadow
8121 * value so we can write to LCR misc control reg.
8123 info->misc_ctrl_value = 0x087e4546;
8124 info->hw_version = 0;
8127 mgsl_add_device(info);
8132 static void __devexit synclink_remove_one (struct pci_dev *dev)