2 * Serial port driver for the ETRAX 100LX chip
4 * Copyright (C) 1998-2007 Axis Communications AB
6 * Many, many authors. Based once upon a time on serial.c for 16x50.
10 static char *serial_version = "$Revision: 1.25 $";
12 #include <linux/types.h>
13 #include <linux/errno.h>
14 #include <linux/signal.h>
15 #include <linux/sched.h>
16 #include <linux/timer.h>
17 #include <linux/interrupt.h>
18 #include <linux/tty.h>
19 #include <linux/tty_flip.h>
20 #include <linux/major.h>
21 #include <linux/string.h>
22 #include <linux/fcntl.h>
24 #include <linux/slab.h>
25 #include <linux/init.h>
26 #include <asm/uaccess.h>
27 #include <linux/kernel.h>
28 #include <linux/mutex.h>
29 #include <linux/bitops.h>
34 #include <asm/system.h>
35 #include <linux/delay.h>
37 #include <arch/svinto.h>
39 /* non-arch dependent serial structures are in linux/serial.h */
40 #include <linux/serial.h>
41 /* while we keep our own stuff (struct e100_serial) in a local .h file */
43 #include <asm/fasttimer.h>
44 #include <arch/io_interface_mux.h>
46 #ifdef CONFIG_ETRAX_SERIAL_FAST_TIMER
47 #ifndef CONFIG_ETRAX_FAST_TIMER
48 #error "Enable FAST_TIMER to use SERIAL_FAST_TIMER"
52 #if defined(CONFIG_ETRAX_SERIAL_RX_TIMEOUT_TICKS) && \
53 (CONFIG_ETRAX_SERIAL_RX_TIMEOUT_TICKS == 0)
54 #error "RX_TIMEOUT_TICKS == 0 not allowed, use 1"
57 #if defined(CONFIG_ETRAX_RS485_ON_PA) && defined(CONFIG_ETRAX_RS485_ON_PORT_G)
58 #error "Disable either CONFIG_ETRAX_RS485_ON_PA or CONFIG_ETRAX_RS485_ON_PORT_G"
62 * All of the compatibilty code so we can compile serial.c against
63 * older kernels is hidden in serial_compat.h
65 #if defined(LOCAL_HEADERS)
66 #include "serial_compat.h"
69 struct tty_driver *serial_driver;
71 /* number of characters left in xmit buffer before we ask for more */
72 #define WAKEUP_CHARS 256
74 //#define SERIAL_DEBUG_INTR
75 //#define SERIAL_DEBUG_OPEN
76 //#define SERIAL_DEBUG_FLOW
77 //#define SERIAL_DEBUG_DATA
78 //#define SERIAL_DEBUG_THROTTLE
79 //#define SERIAL_DEBUG_IO /* Debug for Extra control and status pins */
80 //#define SERIAL_DEBUG_LINE 0 /* What serport we want to debug */
82 /* Enable this to use serial interrupts to handle when you
83 expect the first received event on the serial port to
84 be an error, break or similar. Used to be able to flash IRMA
86 #define SERIAL_HANDLE_EARLY_ERRORS
88 /* Currently 16 descriptors x 128 bytes = 2048 bytes */
89 #define SERIAL_DESCR_BUF_SIZE 256
91 #define SERIAL_PRESCALE_BASE 3125000 /* 3.125MHz */
92 #define DEF_BAUD_BASE SERIAL_PRESCALE_BASE
94 /* We don't want to load the system with massive fast timer interrupt
95 * on high baudrates so limit it to 250 us (4kHz) */
96 #define MIN_FLUSH_TIME_USEC 250
98 /* Add an x here to log a lot of timer stuff */
100 /* Debug details of interrupt handling */
101 #define DINTR1(x) /* irq on/off, errors */
102 #define DINTR2(x) /* tx and rx */
103 /* Debug flip buffer stuff */
105 /* Debug flow control and overview of data flow */
108 #define DLOG_INT_TRIG(x)
110 //#define DEBUG_LOG_INCLUDED
111 #ifndef DEBUG_LOG_INCLUDED
112 #define DEBUG_LOG(line, string, value)
114 struct debug_log_info
117 unsigned long timer_data;
122 #define DEBUG_LOG_SIZE 4096
124 struct debug_log_info debug_log[DEBUG_LOG_SIZE];
125 int debug_log_pos = 0;
127 #define DEBUG_LOG(_line, _string, _value) do { \
128 if ((_line) == SERIAL_DEBUG_LINE) {\
129 debug_log_func(_line, _string, _value); \
133 void debug_log_func(int line, const char *string, int value)
135 if (debug_log_pos < DEBUG_LOG_SIZE) {
136 debug_log[debug_log_pos].time = jiffies;
137 debug_log[debug_log_pos].timer_data = *R_TIMER_DATA;
138 // debug_log[debug_log_pos].line = line;
139 debug_log[debug_log_pos].string = string;
140 debug_log[debug_log_pos].value = value;
143 /*printk(string, value);*/
147 #ifndef CONFIG_ETRAX_SERIAL_RX_TIMEOUT_TICKS
148 /* Default number of timer ticks before flushing rx fifo
149 * When using "little data, low latency applications: use 0
150 * When using "much data applications (PPP)" use ~5
152 #define CONFIG_ETRAX_SERIAL_RX_TIMEOUT_TICKS 5
155 unsigned long timer_data_to_ns(unsigned long timer_data);
157 static void change_speed(struct e100_serial *info);
158 static void rs_throttle(struct tty_struct * tty);
159 static void rs_wait_until_sent(struct tty_struct *tty, int timeout);
160 static int rs_write(struct tty_struct *tty,
161 const unsigned char *buf, int count);
162 #ifdef CONFIG_ETRAX_RS485
163 static int e100_write_rs485(struct tty_struct *tty,
164 const unsigned char *buf, int count);
166 static int get_lsr_info(struct e100_serial *info, unsigned int *value);
169 #define DEF_BAUD 115200 /* 115.2 kbit/s */
170 #define STD_FLAGS (ASYNC_BOOT_AUTOCONF | ASYNC_SKIP_TEST)
171 #define DEF_RX 0x20 /* or SERIAL_CTRL_W >> 8 */
172 /* Default value of tx_ctrl register: has txd(bit 7)=1 (idle) as default */
173 #define DEF_TX 0x80 /* or SERIAL_CTRL_B */
175 /* offsets from R_SERIALx_CTRL */
178 #define REG_DATA_STATUS32 0 /* this is the 32 bit register R_SERIALx_READ */
179 #define REG_TR_DATA 0
181 #define REG_TR_CTRL 1
182 #define REG_REC_CTRL 2
184 #define REG_XOFF 4 /* this is a 32 bit register */
186 /* The bitfields are the same for all serial ports */
187 #define SER_RXD_MASK IO_MASK(R_SERIAL0_STATUS, rxd)
188 #define SER_DATA_AVAIL_MASK IO_MASK(R_SERIAL0_STATUS, data_avail)
189 #define SER_FRAMING_ERR_MASK IO_MASK(R_SERIAL0_STATUS, framing_err)
190 #define SER_PAR_ERR_MASK IO_MASK(R_SERIAL0_STATUS, par_err)
191 #define SER_OVERRUN_MASK IO_MASK(R_SERIAL0_STATUS, overrun)
193 #define SER_ERROR_MASK (SER_OVERRUN_MASK | SER_PAR_ERR_MASK | SER_FRAMING_ERR_MASK)
195 /* Values for info->errorcode */
196 #define ERRCODE_SET_BREAK (TTY_BREAK)
197 #define ERRCODE_INSERT 0x100
198 #define ERRCODE_INSERT_BREAK (ERRCODE_INSERT | TTY_BREAK)
200 #define FORCE_EOP(info) *R_SET_EOP = 1U << info->iseteop;
203 * General note regarding the use of IO_* macros in this file:
205 * We will use the bits defined for DMA channel 6 when using various
206 * IO_* macros (e.g. IO_STATE, IO_MASK, IO_EXTRACT) and _assume_ they are
207 * the same for all channels (which of course they are).
209 * We will also use the bits defined for serial port 0 when writing commands
210 * to the different ports, as these bits too are the same for all ports.
214 /* Mask for the irqs possibly enabled in R_IRQ_MASK1_RD etc. */
215 static const unsigned long e100_ser_int_mask = 0
216 #ifdef CONFIG_ETRAX_SERIAL_PORT0
217 | IO_MASK(R_IRQ_MASK1_RD, ser0_data) | IO_MASK(R_IRQ_MASK1_RD, ser0_ready)
219 #ifdef CONFIG_ETRAX_SERIAL_PORT1
220 | IO_MASK(R_IRQ_MASK1_RD, ser1_data) | IO_MASK(R_IRQ_MASK1_RD, ser1_ready)
222 #ifdef CONFIG_ETRAX_SERIAL_PORT2
223 | IO_MASK(R_IRQ_MASK1_RD, ser2_data) | IO_MASK(R_IRQ_MASK1_RD, ser2_ready)
225 #ifdef CONFIG_ETRAX_SERIAL_PORT3
226 | IO_MASK(R_IRQ_MASK1_RD, ser3_data) | IO_MASK(R_IRQ_MASK1_RD, ser3_ready)
229 unsigned long r_alt_ser_baudrate_shadow = 0;
231 /* this is the data for the four serial ports in the etrax100 */
232 /* DMA2(ser2), DMA4(ser3), DMA6(ser0) or DMA8(ser1) */
233 /* R_DMA_CHx_CLR_INTR, R_DMA_CHx_FIRST, R_DMA_CHx_CMD */
235 static struct e100_serial rs_table[] = {
237 .ioport = (unsigned char *)R_SERIAL0_CTRL,
238 .irq = 1U << 12, /* uses DMA 6 and 7 */
239 .oclrintradr = R_DMA_CH6_CLR_INTR,
240 .ofirstadr = R_DMA_CH6_FIRST,
241 .ocmdadr = R_DMA_CH6_CMD,
242 .ostatusadr = R_DMA_CH6_STATUS,
243 .iclrintradr = R_DMA_CH7_CLR_INTR,
244 .ifirstadr = R_DMA_CH7_FIRST,
245 .icmdadr = R_DMA_CH7_CMD,
246 .idescradr = R_DMA_CH7_DESCR,
251 .dma_owner = dma_ser0,
252 .io_if = if_serial_0,
253 #ifdef CONFIG_ETRAX_SERIAL_PORT0
255 #ifdef CONFIG_ETRAX_SERIAL_PORT0_DMA6_OUT
256 .dma_out_enabled = 1,
257 .dma_out_nbr = SER0_TX_DMA_NBR,
258 .dma_out_irq_nbr = SER0_DMA_TX_IRQ_NBR,
259 .dma_out_irq_flags = IRQF_DISABLED,
260 .dma_out_irq_description = "serial 0 dma tr",
262 .dma_out_enabled = 0,
263 .dma_out_nbr = UINT_MAX,
264 .dma_out_irq_nbr = 0,
265 .dma_out_irq_flags = 0,
266 .dma_out_irq_description = NULL,
268 #ifdef CONFIG_ETRAX_SERIAL_PORT0_DMA7_IN
270 .dma_in_nbr = SER0_RX_DMA_NBR,
271 .dma_in_irq_nbr = SER0_DMA_RX_IRQ_NBR,
272 .dma_in_irq_flags = IRQF_DISABLED,
273 .dma_in_irq_description = "serial 0 dma rec",
276 .dma_in_nbr = UINT_MAX,
278 .dma_in_irq_flags = 0,
279 .dma_in_irq_description = NULL,
283 .io_if_description = NULL,
284 .dma_out_enabled = 0,
289 #ifndef CONFIG_SVINTO_SIM
291 .ioport = (unsigned char *)R_SERIAL1_CTRL,
292 .irq = 1U << 16, /* uses DMA 8 and 9 */
293 .oclrintradr = R_DMA_CH8_CLR_INTR,
294 .ofirstadr = R_DMA_CH8_FIRST,
295 .ocmdadr = R_DMA_CH8_CMD,
296 .ostatusadr = R_DMA_CH8_STATUS,
297 .iclrintradr = R_DMA_CH9_CLR_INTR,
298 .ifirstadr = R_DMA_CH9_FIRST,
299 .icmdadr = R_DMA_CH9_CMD,
300 .idescradr = R_DMA_CH9_DESCR,
305 .dma_owner = dma_ser1,
306 .io_if = if_serial_1,
307 #ifdef CONFIG_ETRAX_SERIAL_PORT1
309 .io_if_description = "ser1",
310 #ifdef CONFIG_ETRAX_SERIAL_PORT1_DMA8_OUT
311 .dma_out_enabled = 1,
312 .dma_out_nbr = SER1_TX_DMA_NBR,
313 .dma_out_irq_nbr = SER1_DMA_TX_IRQ_NBR,
314 .dma_out_irq_flags = IRQF_DISABLED,
315 .dma_out_irq_description = "serial 1 dma tr",
317 .dma_out_enabled = 0,
318 .dma_out_nbr = UINT_MAX,
319 .dma_out_irq_nbr = 0,
320 .dma_out_irq_flags = 0,
321 .dma_out_irq_description = NULL,
323 #ifdef CONFIG_ETRAX_SERIAL_PORT1_DMA9_IN
325 .dma_in_nbr = SER1_RX_DMA_NBR,
326 .dma_in_irq_nbr = SER1_DMA_RX_IRQ_NBR,
327 .dma_in_irq_flags = IRQF_DISABLED,
328 .dma_in_irq_description = "serial 1 dma rec",
332 .dma_in_nbr = UINT_MAX,
334 .dma_in_irq_flags = 0,
335 .dma_in_irq_description = NULL,
339 .io_if_description = NULL,
341 .dma_out_enabled = 0,
347 .ioport = (unsigned char *)R_SERIAL2_CTRL,
348 .irq = 1U << 4, /* uses DMA 2 and 3 */
349 .oclrintradr = R_DMA_CH2_CLR_INTR,
350 .ofirstadr = R_DMA_CH2_FIRST,
351 .ocmdadr = R_DMA_CH2_CMD,
352 .ostatusadr = R_DMA_CH2_STATUS,
353 .iclrintradr = R_DMA_CH3_CLR_INTR,
354 .ifirstadr = R_DMA_CH3_FIRST,
355 .icmdadr = R_DMA_CH3_CMD,
356 .idescradr = R_DMA_CH3_DESCR,
361 .dma_owner = dma_ser2,
362 .io_if = if_serial_2,
363 #ifdef CONFIG_ETRAX_SERIAL_PORT2
365 .io_if_description = "ser2",
366 #ifdef CONFIG_ETRAX_SERIAL_PORT2_DMA2_OUT
367 .dma_out_enabled = 1,
368 .dma_out_nbr = SER2_TX_DMA_NBR,
369 .dma_out_irq_nbr = SER2_DMA_TX_IRQ_NBR,
370 .dma_out_irq_flags = IRQF_DISABLED,
371 .dma_out_irq_description = "serial 2 dma tr",
373 .dma_out_enabled = 0,
374 .dma_out_nbr = UINT_MAX,
375 .dma_out_irq_nbr = 0,
376 .dma_out_irq_flags = 0,
377 .dma_out_irq_description = NULL,
379 #ifdef CONFIG_ETRAX_SERIAL_PORT2_DMA3_IN
381 .dma_in_nbr = SER2_RX_DMA_NBR,
382 .dma_in_irq_nbr = SER2_DMA_RX_IRQ_NBR,
383 .dma_in_irq_flags = IRQF_DISABLED,
384 .dma_in_irq_description = "serial 2 dma rec",
387 .dma_in_nbr = UINT_MAX,
389 .dma_in_irq_flags = 0,
390 .dma_in_irq_description = NULL,
394 .io_if_description = NULL,
395 .dma_out_enabled = 0,
401 .ioport = (unsigned char *)R_SERIAL3_CTRL,
402 .irq = 1U << 8, /* uses DMA 4 and 5 */
403 .oclrintradr = R_DMA_CH4_CLR_INTR,
404 .ofirstadr = R_DMA_CH4_FIRST,
405 .ocmdadr = R_DMA_CH4_CMD,
406 .ostatusadr = R_DMA_CH4_STATUS,
407 .iclrintradr = R_DMA_CH5_CLR_INTR,
408 .ifirstadr = R_DMA_CH5_FIRST,
409 .icmdadr = R_DMA_CH5_CMD,
410 .idescradr = R_DMA_CH5_DESCR,
415 .dma_owner = dma_ser3,
416 .io_if = if_serial_3,
417 #ifdef CONFIG_ETRAX_SERIAL_PORT3
419 .io_if_description = "ser3",
420 #ifdef CONFIG_ETRAX_SERIAL_PORT3_DMA4_OUT
421 .dma_out_enabled = 1,
422 .dma_out_nbr = SER3_TX_DMA_NBR,
423 .dma_out_irq_nbr = SER3_DMA_TX_IRQ_NBR,
424 .dma_out_irq_flags = IRQF_DISABLED,
425 .dma_out_irq_description = "serial 3 dma tr",
427 .dma_out_enabled = 0,
428 .dma_out_nbr = UINT_MAX,
429 .dma_out_irq_nbr = 0,
430 .dma_out_irq_flags = 0,
431 .dma_out_irq_description = NULL,
433 #ifdef CONFIG_ETRAX_SERIAL_PORT3_DMA5_IN
435 .dma_in_nbr = SER3_RX_DMA_NBR,
436 .dma_in_irq_nbr = SER3_DMA_RX_IRQ_NBR,
437 .dma_in_irq_flags = IRQF_DISABLED,
438 .dma_in_irq_description = "serial 3 dma rec",
441 .dma_in_nbr = UINT_MAX,
443 .dma_in_irq_flags = 0,
444 .dma_in_irq_description = NULL
448 .io_if_description = NULL,
449 .dma_out_enabled = 0,
457 #define NR_PORTS (sizeof(rs_table)/sizeof(struct e100_serial))
459 static struct ktermios *serial_termios[NR_PORTS];
460 #ifdef CONFIG_ETRAX_SERIAL_FAST_TIMER
461 static struct fast_timer fast_timers[NR_PORTS];
464 #ifdef CONFIG_ETRAX_SERIAL_PROC_ENTRY
465 #define PROCSTAT(x) x
466 struct ser_statistics_type {
468 int early_errors_cnt;
471 unsigned long int processing_flip;
472 unsigned long processing_flip_still_room;
473 unsigned long int timeout_flush_cnt;
480 static struct ser_statistics_type ser_stat[NR_PORTS];
486 #endif /* CONFIG_ETRAX_SERIAL_PROC_ENTRY */
489 #if defined(CONFIG_ETRAX_RS485)
490 #ifdef CONFIG_ETRAX_FAST_TIMER
491 static struct fast_timer fast_timers_rs485[NR_PORTS];
493 #if defined(CONFIG_ETRAX_RS485_ON_PA)
494 static int rs485_pa_bit = CONFIG_ETRAX_RS485_ON_PA_BIT;
496 #if defined(CONFIG_ETRAX_RS485_ON_PORT_G)
497 static int rs485_port_g_bit = CONFIG_ETRAX_RS485_ON_PORT_G_BIT;
501 /* Info and macros needed for each ports extra control/status signals. */
502 #define E100_STRUCT_PORT(line, pinname) \
503 ((CONFIG_ETRAX_SER##line##_##pinname##_ON_PA_BIT >= 0)? \
504 (R_PORT_PA_DATA): ( \
505 (CONFIG_ETRAX_SER##line##_##pinname##_ON_PB_BIT >= 0)? \
506 (R_PORT_PB_DATA):&dummy_ser[line]))
508 #define E100_STRUCT_SHADOW(line, pinname) \
509 ((CONFIG_ETRAX_SER##line##_##pinname##_ON_PA_BIT >= 0)? \
510 (&port_pa_data_shadow): ( \
511 (CONFIG_ETRAX_SER##line##_##pinname##_ON_PB_BIT >= 0)? \
512 (&port_pb_data_shadow):&dummy_ser[line]))
513 #define E100_STRUCT_MASK(line, pinname) \
514 ((CONFIG_ETRAX_SER##line##_##pinname##_ON_PA_BIT >= 0)? \
515 (1<<CONFIG_ETRAX_SER##line##_##pinname##_ON_PA_BIT): ( \
516 (CONFIG_ETRAX_SER##line##_##pinname##_ON_PB_BIT >= 0)? \
517 (1<<CONFIG_ETRAX_SER##line##_##pinname##_ON_PB_BIT):DUMMY_##pinname##_MASK))
519 #define DUMMY_DTR_MASK 1
520 #define DUMMY_RI_MASK 2
521 #define DUMMY_DSR_MASK 4
522 #define DUMMY_CD_MASK 8
523 static unsigned char dummy_ser[NR_PORTS] = {0xFF, 0xFF, 0xFF,0xFF};
525 /* If not all status pins are used or disabled, use mixed mode */
526 #ifdef CONFIG_ETRAX_SERIAL_PORT0
528 #define SER0_PA_BITSUM (CONFIG_ETRAX_SER0_DTR_ON_PA_BIT+CONFIG_ETRAX_SER0_RI_ON_PA_BIT+CONFIG_ETRAX_SER0_DSR_ON_PA_BIT+CONFIG_ETRAX_SER0_CD_ON_PA_BIT)
530 #if SER0_PA_BITSUM != -4
531 # if CONFIG_ETRAX_SER0_DTR_ON_PA_BIT == -1
532 # ifndef CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED
533 # define CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED 1
536 # if CONFIG_ETRAX_SER0_RI_ON_PA_BIT == -1
537 # ifndef CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED
538 # define CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED 1
541 # if CONFIG_ETRAX_SER0_DSR_ON_PA_BIT == -1
542 # ifndef CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED
543 # define CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED 1
546 # if CONFIG_ETRAX_SER0_CD_ON_PA_BIT == -1
547 # ifndef CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED
548 # define CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED 1
553 #define SER0_PB_BITSUM (CONFIG_ETRAX_SER0_DTR_ON_PB_BIT+CONFIG_ETRAX_SER0_RI_ON_PB_BIT+CONFIG_ETRAX_SER0_DSR_ON_PB_BIT+CONFIG_ETRAX_SER0_CD_ON_PB_BIT)
555 #if SER0_PB_BITSUM != -4
556 # if CONFIG_ETRAX_SER0_DTR_ON_PB_BIT == -1
557 # ifndef CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED
558 # define CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED 1
561 # if CONFIG_ETRAX_SER0_RI_ON_PB_BIT == -1
562 # ifndef CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED
563 # define CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED 1
566 # if CONFIG_ETRAX_SER0_DSR_ON_PB_BIT == -1
567 # ifndef CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED
568 # define CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED 1
571 # if CONFIG_ETRAX_SER0_CD_ON_PB_BIT == -1
572 # ifndef CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED
573 # define CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED 1
581 #ifdef CONFIG_ETRAX_SERIAL_PORT1
583 #define SER1_PA_BITSUM (CONFIG_ETRAX_SER1_DTR_ON_PA_BIT+CONFIG_ETRAX_SER1_RI_ON_PA_BIT+CONFIG_ETRAX_SER1_DSR_ON_PA_BIT+CONFIG_ETRAX_SER1_CD_ON_PA_BIT)
585 #if SER1_PA_BITSUM != -4
586 # if CONFIG_ETRAX_SER1_DTR_ON_PA_BIT == -1
587 # ifndef CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED
588 # define CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED 1
591 # if CONFIG_ETRAX_SER1_RI_ON_PA_BIT == -1
592 # ifndef CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED
593 # define CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED 1
596 # if CONFIG_ETRAX_SER1_DSR_ON_PA_BIT == -1
597 # ifndef CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED
598 # define CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED 1
601 # if CONFIG_ETRAX_SER1_CD_ON_PA_BIT == -1
602 # ifndef CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED
603 # define CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED 1
608 #define SER1_PB_BITSUM (CONFIG_ETRAX_SER1_DTR_ON_PB_BIT+CONFIG_ETRAX_SER1_RI_ON_PB_BIT+CONFIG_ETRAX_SER1_DSR_ON_PB_BIT+CONFIG_ETRAX_SER1_CD_ON_PB_BIT)
610 #if SER1_PB_BITSUM != -4
611 # if CONFIG_ETRAX_SER1_DTR_ON_PB_BIT == -1
612 # ifndef CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED
613 # define CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED 1
616 # if CONFIG_ETRAX_SER1_RI_ON_PB_BIT == -1
617 # ifndef CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED
618 # define CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED 1
621 # if CONFIG_ETRAX_SER1_DSR_ON_PB_BIT == -1
622 # ifndef CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED
623 # define CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED 1
626 # if CONFIG_ETRAX_SER1_CD_ON_PB_BIT == -1
627 # ifndef CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED
628 # define CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED 1
635 #ifdef CONFIG_ETRAX_SERIAL_PORT2
637 #define SER2_PA_BITSUM (CONFIG_ETRAX_SER2_DTR_ON_PA_BIT+CONFIG_ETRAX_SER2_RI_ON_PA_BIT+CONFIG_ETRAX_SER2_DSR_ON_PA_BIT+CONFIG_ETRAX_SER2_CD_ON_PA_BIT)
639 #if SER2_PA_BITSUM != -4
640 # if CONFIG_ETRAX_SER2_DTR_ON_PA_BIT == -1
641 # ifndef CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED
642 # define CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED 1
645 # if CONFIG_ETRAX_SER2_RI_ON_PA_BIT == -1
646 # ifndef CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED
647 # define CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED 1
650 # if CONFIG_ETRAX_SER2_DSR_ON_PA_BIT == -1
651 # ifndef CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED
652 # define CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED 1
655 # if CONFIG_ETRAX_SER2_CD_ON_PA_BIT == -1
656 # ifndef CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED
657 # define CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED 1
662 #define SER2_PB_BITSUM (CONFIG_ETRAX_SER2_DTR_ON_PB_BIT+CONFIG_ETRAX_SER2_RI_ON_PB_BIT+CONFIG_ETRAX_SER2_DSR_ON_PB_BIT+CONFIG_ETRAX_SER2_CD_ON_PB_BIT)
664 #if SER2_PB_BITSUM != -4
665 # if CONFIG_ETRAX_SER2_DTR_ON_PB_BIT == -1
666 # ifndef CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED
667 # define CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED 1
670 # if CONFIG_ETRAX_SER2_RI_ON_PB_BIT == -1
671 # ifndef CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED
672 # define CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED 1
675 # if CONFIG_ETRAX_SER2_DSR_ON_PB_BIT == -1
676 # ifndef CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED
677 # define CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED 1
680 # if CONFIG_ETRAX_SER2_CD_ON_PB_BIT == -1
681 # ifndef CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED
682 # define CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED 1
689 #ifdef CONFIG_ETRAX_SERIAL_PORT3
691 #define SER3_PA_BITSUM (CONFIG_ETRAX_SER3_DTR_ON_PA_BIT+CONFIG_ETRAX_SER3_RI_ON_PA_BIT+CONFIG_ETRAX_SER3_DSR_ON_PA_BIT+CONFIG_ETRAX_SER3_CD_ON_PA_BIT)
693 #if SER3_PA_BITSUM != -4
694 # if CONFIG_ETRAX_SER3_DTR_ON_PA_BIT == -1
695 # ifndef CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED
696 # define CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED 1
699 # if CONFIG_ETRAX_SER3_RI_ON_PA_BIT == -1
700 # ifndef CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED
701 # define CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED 1
704 # if CONFIG_ETRAX_SER3_DSR_ON_PA_BIT == -1
705 # ifndef CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED
706 # define CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED 1
709 # if CONFIG_ETRAX_SER3_CD_ON_PA_BIT == -1
710 # ifndef CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED
711 # define CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED 1
716 #define SER3_PB_BITSUM (CONFIG_ETRAX_SER3_DTR_ON_PB_BIT+CONFIG_ETRAX_SER3_RI_ON_PB_BIT+CONFIG_ETRAX_SER3_DSR_ON_PB_BIT+CONFIG_ETRAX_SER3_CD_ON_PB_BIT)
718 #if SER3_PB_BITSUM != -4
719 # if CONFIG_ETRAX_SER3_DTR_ON_PB_BIT == -1
720 # ifndef CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED
721 # define CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED 1
724 # if CONFIG_ETRAX_SER3_RI_ON_PB_BIT == -1
725 # ifndef CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED
726 # define CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED 1
729 # if CONFIG_ETRAX_SER3_DSR_ON_PB_BIT == -1
730 # ifndef CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED
731 # define CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED 1
734 # if CONFIG_ETRAX_SER3_CD_ON_PB_BIT == -1
735 # ifndef CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED
736 # define CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED 1
744 #if defined(CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED) || \
745 defined(CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED) || \
746 defined(CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED) || \
747 defined(CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED)
748 #define CONFIG_ETRAX_SERX_DTR_RI_DSR_CD_MIXED
751 #ifdef CONFIG_ETRAX_SERX_DTR_RI_DSR_CD_MIXED
752 /* The pins can be mixed on PA and PB */
753 #define CONTROL_PINS_PORT_NOT_USED(line) \
754 &dummy_ser[line], &dummy_ser[line], \
755 &dummy_ser[line], &dummy_ser[line], \
756 &dummy_ser[line], &dummy_ser[line], \
757 &dummy_ser[line], &dummy_ser[line], \
758 DUMMY_DTR_MASK, DUMMY_RI_MASK, DUMMY_DSR_MASK, DUMMY_CD_MASK
763 volatile unsigned char *dtr_port;
764 unsigned char *dtr_shadow;
765 volatile unsigned char *ri_port;
766 unsigned char *ri_shadow;
767 volatile unsigned char *dsr_port;
768 unsigned char *dsr_shadow;
769 volatile unsigned char *cd_port;
770 unsigned char *cd_shadow;
772 unsigned char dtr_mask;
773 unsigned char ri_mask;
774 unsigned char dsr_mask;
775 unsigned char cd_mask;
778 static const struct control_pins e100_modem_pins[NR_PORTS] =
782 #ifdef CONFIG_ETRAX_SERIAL_PORT0
783 E100_STRUCT_PORT(0,DTR), E100_STRUCT_SHADOW(0,DTR),
784 E100_STRUCT_PORT(0,RI), E100_STRUCT_SHADOW(0,RI),
785 E100_STRUCT_PORT(0,DSR), E100_STRUCT_SHADOW(0,DSR),
786 E100_STRUCT_PORT(0,CD), E100_STRUCT_SHADOW(0,CD),
787 E100_STRUCT_MASK(0,DTR),
788 E100_STRUCT_MASK(0,RI),
789 E100_STRUCT_MASK(0,DSR),
790 E100_STRUCT_MASK(0,CD)
792 CONTROL_PINS_PORT_NOT_USED(0)
798 #ifdef CONFIG_ETRAX_SERIAL_PORT1
799 E100_STRUCT_PORT(1,DTR), E100_STRUCT_SHADOW(1,DTR),
800 E100_STRUCT_PORT(1,RI), E100_STRUCT_SHADOW(1,RI),
801 E100_STRUCT_PORT(1,DSR), E100_STRUCT_SHADOW(1,DSR),
802 E100_STRUCT_PORT(1,CD), E100_STRUCT_SHADOW(1,CD),
803 E100_STRUCT_MASK(1,DTR),
804 E100_STRUCT_MASK(1,RI),
805 E100_STRUCT_MASK(1,DSR),
806 E100_STRUCT_MASK(1,CD)
808 CONTROL_PINS_PORT_NOT_USED(1)
814 #ifdef CONFIG_ETRAX_SERIAL_PORT2
815 E100_STRUCT_PORT(2,DTR), E100_STRUCT_SHADOW(2,DTR),
816 E100_STRUCT_PORT(2,RI), E100_STRUCT_SHADOW(2,RI),
817 E100_STRUCT_PORT(2,DSR), E100_STRUCT_SHADOW(2,DSR),
818 E100_STRUCT_PORT(2,CD), E100_STRUCT_SHADOW(2,CD),
819 E100_STRUCT_MASK(2,DTR),
820 E100_STRUCT_MASK(2,RI),
821 E100_STRUCT_MASK(2,DSR),
822 E100_STRUCT_MASK(2,CD)
824 CONTROL_PINS_PORT_NOT_USED(2)
830 #ifdef CONFIG_ETRAX_SERIAL_PORT3
831 E100_STRUCT_PORT(3,DTR), E100_STRUCT_SHADOW(3,DTR),
832 E100_STRUCT_PORT(3,RI), E100_STRUCT_SHADOW(3,RI),
833 E100_STRUCT_PORT(3,DSR), E100_STRUCT_SHADOW(3,DSR),
834 E100_STRUCT_PORT(3,CD), E100_STRUCT_SHADOW(3,CD),
835 E100_STRUCT_MASK(3,DTR),
836 E100_STRUCT_MASK(3,RI),
837 E100_STRUCT_MASK(3,DSR),
838 E100_STRUCT_MASK(3,CD)
840 CONTROL_PINS_PORT_NOT_USED(3)
844 #else /* CONFIG_ETRAX_SERX_DTR_RI_DSR_CD_MIXED */
846 /* All pins are on either PA or PB for each serial port */
847 #define CONTROL_PINS_PORT_NOT_USED(line) \
848 &dummy_ser[line], &dummy_ser[line], \
849 DUMMY_DTR_MASK, DUMMY_RI_MASK, DUMMY_DSR_MASK, DUMMY_CD_MASK
854 volatile unsigned char *port;
855 unsigned char *shadow;
857 unsigned char dtr_mask;
858 unsigned char ri_mask;
859 unsigned char dsr_mask;
860 unsigned char cd_mask;
863 #define dtr_port port
864 #define dtr_shadow shadow
866 #define ri_shadow shadow
867 #define dsr_port port
868 #define dsr_shadow shadow
870 #define cd_shadow shadow
872 static const struct control_pins e100_modem_pins[NR_PORTS] =
876 #ifdef CONFIG_ETRAX_SERIAL_PORT0
877 E100_STRUCT_PORT(0,DTR), E100_STRUCT_SHADOW(0,DTR),
878 E100_STRUCT_MASK(0,DTR),
879 E100_STRUCT_MASK(0,RI),
880 E100_STRUCT_MASK(0,DSR),
881 E100_STRUCT_MASK(0,CD)
883 CONTROL_PINS_PORT_NOT_USED(0)
889 #ifdef CONFIG_ETRAX_SERIAL_PORT1
890 E100_STRUCT_PORT(1,DTR), E100_STRUCT_SHADOW(1,DTR),
891 E100_STRUCT_MASK(1,DTR),
892 E100_STRUCT_MASK(1,RI),
893 E100_STRUCT_MASK(1,DSR),
894 E100_STRUCT_MASK(1,CD)
896 CONTROL_PINS_PORT_NOT_USED(1)
902 #ifdef CONFIG_ETRAX_SERIAL_PORT2
903 E100_STRUCT_PORT(2,DTR), E100_STRUCT_SHADOW(2,DTR),
904 E100_STRUCT_MASK(2,DTR),
905 E100_STRUCT_MASK(2,RI),
906 E100_STRUCT_MASK(2,DSR),
907 E100_STRUCT_MASK(2,CD)
909 CONTROL_PINS_PORT_NOT_USED(2)
915 #ifdef CONFIG_ETRAX_SERIAL_PORT3
916 E100_STRUCT_PORT(3,DTR), E100_STRUCT_SHADOW(3,DTR),
917 E100_STRUCT_MASK(3,DTR),
918 E100_STRUCT_MASK(3,RI),
919 E100_STRUCT_MASK(3,DSR),
920 E100_STRUCT_MASK(3,CD)
922 CONTROL_PINS_PORT_NOT_USED(3)
926 #endif /* !CONFIG_ETRAX_SERX_DTR_RI_DSR_CD_MIXED */
928 #define E100_RTS_MASK 0x20
929 #define E100_CTS_MASK 0x40
931 /* All serial port signals are active low:
932 * active = 0 -> 3.3V to RS-232 driver -> -12V on RS-232 level
933 * inactive = 1 -> 0V to RS-232 driver -> +12V on RS-232 level
935 * These macros returns the pin value: 0=0V, >=1 = 3.3V on ETRAX chip
939 #define E100_RTS_GET(info) ((info)->rx_ctrl & E100_RTS_MASK)
941 #define E100_CTS_GET(info) ((info)->ioport[REG_STATUS] & E100_CTS_MASK)
943 /* These are typically PA or PB and 0 means 0V, 1 means 3.3V */
945 #define E100_DTR_GET(info) ((*e100_modem_pins[(info)->line].dtr_shadow) & e100_modem_pins[(info)->line].dtr_mask)
947 /* Normally inputs */
948 #define E100_RI_GET(info) ((*e100_modem_pins[(info)->line].ri_port) & e100_modem_pins[(info)->line].ri_mask)
949 #define E100_CD_GET(info) ((*e100_modem_pins[(info)->line].cd_port) & e100_modem_pins[(info)->line].cd_mask)
952 #define E100_DSR_GET(info) ((*e100_modem_pins[(info)->line].dsr_port) & e100_modem_pins[(info)->line].dsr_mask)
956 * tmp_buf is used as a temporary buffer by serial_write. We need to
957 * lock it in case the memcpy_fromfs blocks while swapping in a page,
958 * and some other program tries to do a serial write at the same time.
959 * Since the lock will only come under contention when the system is
960 * swapping and available memory is low, it makes sense to share one
961 * buffer across all the serial ports, since it significantly saves
962 * memory if large numbers of serial ports are open.
964 static unsigned char *tmp_buf;
965 static DEFINE_MUTEX(tmp_buf_mutex);
967 /* Calculate the chartime depending on baudrate, numbor of bits etc. */
968 static void update_char_time(struct e100_serial * info)
970 tcflag_t cflags = info->port.tty->termios->c_cflag;
973 /* calc. number of bits / data byte */
974 /* databits + startbit and 1 stopbit */
975 if ((cflags & CSIZE) == CS7)
980 if (cflags & CSTOPB) /* 2 stopbits ? */
983 if (cflags & PARENB) /* parity bit ? */
987 info->char_time_usec = ((bits * 1000000) / info->baud) + 1;
988 info->flush_time_usec = 4*info->char_time_usec;
989 if (info->flush_time_usec < MIN_FLUSH_TIME_USEC)
990 info->flush_time_usec = MIN_FLUSH_TIME_USEC;
995 * This function maps from the Bxxxx defines in asm/termbits.h into real
1000 cflag_to_baud(unsigned int cflag)
1002 static int baud_table[] = {
1003 0, 50, 75, 110, 134, 150, 200, 300, 600, 1200, 1800, 2400,
1004 4800, 9600, 19200, 38400 };
1006 static int ext_baud_table[] = {
1007 0, 57600, 115200, 230400, 460800, 921600, 1843200, 6250000,
1008 0, 0, 0, 0, 0, 0, 0, 0 };
1010 if (cflag & CBAUDEX)
1011 return ext_baud_table[(cflag & CBAUD) & ~CBAUDEX];
1013 return baud_table[cflag & CBAUD];
1016 /* and this maps to an etrax100 hardware baud constant */
1018 static unsigned char
1019 cflag_to_etrax_baud(unsigned int cflag)
1023 static char baud_table[] = {
1024 -1, -1, -1, -1, -1, -1, -1, 0, 1, 2, -1, 3, 4, 5, 6, 7 };
1026 static char ext_baud_table[] = {
1027 -1, 8, 9, 10, 11, 12, 13, 14, -1, -1, -1, -1, -1, -1, -1, -1 };
1029 if (cflag & CBAUDEX)
1030 retval = ext_baud_table[(cflag & CBAUD) & ~CBAUDEX];
1032 retval = baud_table[cflag & CBAUD];
1035 printk(KERN_WARNING "serdriver tried setting invalid baud rate, flags %x.\n", cflag);
1036 retval = 5; /* choose default 9600 instead */
1039 return retval | (retval << 4); /* choose same for both TX and RX */
1043 /* Various static support functions */
1045 /* Functions to set or clear DTR/RTS on the requested line */
1046 /* It is complicated by the fact that RTS is a serial port register, while
1047 * DTR might not be implemented in the HW at all, and if it is, it can be on
1053 e100_dtr(struct e100_serial *info, int set)
1055 #ifndef CONFIG_SVINTO_SIM
1056 unsigned char mask = e100_modem_pins[info->line].dtr_mask;
1058 #ifdef SERIAL_DEBUG_IO
1059 printk("ser%i dtr %i mask: 0x%02X\n", info->line, set, mask);
1060 printk("ser%i shadow before 0x%02X get: %i\n",
1061 info->line, *e100_modem_pins[info->line].dtr_shadow,
1062 E100_DTR_GET(info));
1064 /* DTR is active low */
1066 unsigned long flags;
1068 local_irq_save(flags);
1069 *e100_modem_pins[info->line].dtr_shadow &= ~mask;
1070 *e100_modem_pins[info->line].dtr_shadow |= (set ? 0 : mask);
1071 *e100_modem_pins[info->line].dtr_port = *e100_modem_pins[info->line].dtr_shadow;
1072 local_irq_restore(flags);
1075 #ifdef SERIAL_DEBUG_IO
1076 printk("ser%i shadow after 0x%02X get: %i\n",
1077 info->line, *e100_modem_pins[info->line].dtr_shadow,
1078 E100_DTR_GET(info));
1083 /* set = 0 means 3.3V on the pin, bitvalue: 0=active, 1=inactive
1087 e100_rts(struct e100_serial *info, int set)
1089 #ifndef CONFIG_SVINTO_SIM
1090 unsigned long flags;
1091 local_irq_save(flags);
1092 info->rx_ctrl &= ~E100_RTS_MASK;
1093 info->rx_ctrl |= (set ? 0 : E100_RTS_MASK); /* RTS is active low */
1094 info->ioport[REG_REC_CTRL] = info->rx_ctrl;
1095 local_irq_restore(flags);
1096 #ifdef SERIAL_DEBUG_IO
1097 printk("ser%i rts %i\n", info->line, set);
1103 /* If this behaves as a modem, RI and CD is an output */
1105 e100_ri_out(struct e100_serial *info, int set)
1107 #ifndef CONFIG_SVINTO_SIM
1108 /* RI is active low */
1110 unsigned char mask = e100_modem_pins[info->line].ri_mask;
1111 unsigned long flags;
1113 local_irq_save(flags);
1114 *e100_modem_pins[info->line].ri_shadow &= ~mask;
1115 *e100_modem_pins[info->line].ri_shadow |= (set ? 0 : mask);
1116 *e100_modem_pins[info->line].ri_port = *e100_modem_pins[info->line].ri_shadow;
1117 local_irq_restore(flags);
1122 e100_cd_out(struct e100_serial *info, int set)
1124 #ifndef CONFIG_SVINTO_SIM
1125 /* CD is active low */
1127 unsigned char mask = e100_modem_pins[info->line].cd_mask;
1128 unsigned long flags;
1130 local_irq_save(flags);
1131 *e100_modem_pins[info->line].cd_shadow &= ~mask;
1132 *e100_modem_pins[info->line].cd_shadow |= (set ? 0 : mask);
1133 *e100_modem_pins[info->line].cd_port = *e100_modem_pins[info->line].cd_shadow;
1134 local_irq_restore(flags);
1140 e100_disable_rx(struct e100_serial *info)
1142 #ifndef CONFIG_SVINTO_SIM
1143 /* disable the receiver */
1144 info->ioport[REG_REC_CTRL] =
1145 (info->rx_ctrl &= ~IO_MASK(R_SERIAL0_REC_CTRL, rec_enable));
1150 e100_enable_rx(struct e100_serial *info)
1152 #ifndef CONFIG_SVINTO_SIM
1153 /* enable the receiver */
1154 info->ioport[REG_REC_CTRL] =
1155 (info->rx_ctrl |= IO_MASK(R_SERIAL0_REC_CTRL, rec_enable));
1159 /* the rx DMA uses both the dma_descr and the dma_eop interrupts */
1162 e100_disable_rxdma_irq(struct e100_serial *info)
1164 #ifdef SERIAL_DEBUG_INTR
1165 printk("rxdma_irq(%d): 0\n",info->line);
1167 DINTR1(DEBUG_LOG(info->line,"IRQ disable_rxdma_irq %i\n", info->line));
1168 *R_IRQ_MASK2_CLR = (info->irq << 2) | (info->irq << 3);
1172 e100_enable_rxdma_irq(struct e100_serial *info)
1174 #ifdef SERIAL_DEBUG_INTR
1175 printk("rxdma_irq(%d): 1\n",info->line);
1177 DINTR1(DEBUG_LOG(info->line,"IRQ enable_rxdma_irq %i\n", info->line));
1178 *R_IRQ_MASK2_SET = (info->irq << 2) | (info->irq << 3);
1181 /* the tx DMA uses only dma_descr interrupt */
1183 static void e100_disable_txdma_irq(struct e100_serial *info)
1185 #ifdef SERIAL_DEBUG_INTR
1186 printk("txdma_irq(%d): 0\n",info->line);
1188 DINTR1(DEBUG_LOG(info->line,"IRQ disable_txdma_irq %i\n", info->line));
1189 *R_IRQ_MASK2_CLR = info->irq;
1192 static void e100_enable_txdma_irq(struct e100_serial *info)
1194 #ifdef SERIAL_DEBUG_INTR
1195 printk("txdma_irq(%d): 1\n",info->line);
1197 DINTR1(DEBUG_LOG(info->line,"IRQ enable_txdma_irq %i\n", info->line));
1198 *R_IRQ_MASK2_SET = info->irq;
1201 static void e100_disable_txdma_channel(struct e100_serial *info)
1203 unsigned long flags;
1205 /* Disable output DMA channel for the serial port in question
1206 * ( set to something other than serialX)
1208 local_irq_save(flags);
1209 DFLOW(DEBUG_LOG(info->line, "disable_txdma_channel %i\n", info->line));
1210 if (info->line == 0) {
1211 if ((genconfig_shadow & IO_MASK(R_GEN_CONFIG, dma6)) ==
1212 IO_STATE(R_GEN_CONFIG, dma6, serial0)) {
1213 genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma6);
1214 genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma6, unused);
1216 } else if (info->line == 1) {
1217 if ((genconfig_shadow & IO_MASK(R_GEN_CONFIG, dma8)) ==
1218 IO_STATE(R_GEN_CONFIG, dma8, serial1)) {
1219 genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma8);
1220 genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma8, usb);
1222 } else if (info->line == 2) {
1223 if ((genconfig_shadow & IO_MASK(R_GEN_CONFIG, dma2)) ==
1224 IO_STATE(R_GEN_CONFIG, dma2, serial2)) {
1225 genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma2);
1226 genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma2, par0);
1228 } else if (info->line == 3) {
1229 if ((genconfig_shadow & IO_MASK(R_GEN_CONFIG, dma4)) ==
1230 IO_STATE(R_GEN_CONFIG, dma4, serial3)) {
1231 genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma4);
1232 genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma4, par1);
1235 *R_GEN_CONFIG = genconfig_shadow;
1236 local_irq_restore(flags);
1240 static void e100_enable_txdma_channel(struct e100_serial *info)
1242 unsigned long flags;
1244 local_irq_save(flags);
1245 DFLOW(DEBUG_LOG(info->line, "enable_txdma_channel %i\n", info->line));
1246 /* Enable output DMA channel for the serial port in question */
1247 if (info->line == 0) {
1248 genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma6);
1249 genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma6, serial0);
1250 } else if (info->line == 1) {
1251 genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma8);
1252 genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma8, serial1);
1253 } else if (info->line == 2) {
1254 genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma2);
1255 genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma2, serial2);
1256 } else if (info->line == 3) {
1257 genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma4);
1258 genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma4, serial3);
1260 *R_GEN_CONFIG = genconfig_shadow;
1261 local_irq_restore(flags);
1264 static void e100_disable_rxdma_channel(struct e100_serial *info)
1266 unsigned long flags;
1268 /* Disable input DMA channel for the serial port in question
1269 * ( set to something other than serialX)
1271 local_irq_save(flags);
1272 if (info->line == 0) {
1273 if ((genconfig_shadow & IO_MASK(R_GEN_CONFIG, dma7)) ==
1274 IO_STATE(R_GEN_CONFIG, dma7, serial0)) {
1275 genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma7);
1276 genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma7, unused);
1278 } else if (info->line == 1) {
1279 if ((genconfig_shadow & IO_MASK(R_GEN_CONFIG, dma9)) ==
1280 IO_STATE(R_GEN_CONFIG, dma9, serial1)) {
1281 genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma9);
1282 genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma9, usb);
1284 } else if (info->line == 2) {
1285 if ((genconfig_shadow & IO_MASK(R_GEN_CONFIG, dma3)) ==
1286 IO_STATE(R_GEN_CONFIG, dma3, serial2)) {
1287 genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma3);
1288 genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma3, par0);
1290 } else if (info->line == 3) {
1291 if ((genconfig_shadow & IO_MASK(R_GEN_CONFIG, dma5)) ==
1292 IO_STATE(R_GEN_CONFIG, dma5, serial3)) {
1293 genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma5);
1294 genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma5, par1);
1297 *R_GEN_CONFIG = genconfig_shadow;
1298 local_irq_restore(flags);
1302 static void e100_enable_rxdma_channel(struct e100_serial *info)
1304 unsigned long flags;
1306 local_irq_save(flags);
1307 /* Enable input DMA channel for the serial port in question */
1308 if (info->line == 0) {
1309 genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma7);
1310 genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma7, serial0);
1311 } else if (info->line == 1) {
1312 genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma9);
1313 genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma9, serial1);
1314 } else if (info->line == 2) {
1315 genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma3);
1316 genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma3, serial2);
1317 } else if (info->line == 3) {
1318 genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma5);
1319 genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma5, serial3);
1321 *R_GEN_CONFIG = genconfig_shadow;
1322 local_irq_restore(flags);
1325 #ifdef SERIAL_HANDLE_EARLY_ERRORS
1326 /* in order to detect and fix errors on the first byte
1327 we have to use the serial interrupts as well. */
1330 e100_disable_serial_data_irq(struct e100_serial *info)
1332 #ifdef SERIAL_DEBUG_INTR
1333 printk("ser_irq(%d): 0\n",info->line);
1335 DINTR1(DEBUG_LOG(info->line,"IRQ disable data_irq %i\n", info->line));
1336 *R_IRQ_MASK1_CLR = (1U << (8+2*info->line));
1340 e100_enable_serial_data_irq(struct e100_serial *info)
1342 #ifdef SERIAL_DEBUG_INTR
1343 printk("ser_irq(%d): 1\n",info->line);
1344 printk("**** %d = %d\n",
1346 (1U << (8+2*info->line)));
1348 DINTR1(DEBUG_LOG(info->line,"IRQ enable data_irq %i\n", info->line));
1349 *R_IRQ_MASK1_SET = (1U << (8+2*info->line));
1354 e100_disable_serial_tx_ready_irq(struct e100_serial *info)
1356 #ifdef SERIAL_DEBUG_INTR
1357 printk("ser_tx_irq(%d): 0\n",info->line);
1359 DINTR1(DEBUG_LOG(info->line,"IRQ disable ready_irq %i\n", info->line));
1360 *R_IRQ_MASK1_CLR = (1U << (8+1+2*info->line));
1364 e100_enable_serial_tx_ready_irq(struct e100_serial *info)
1366 #ifdef SERIAL_DEBUG_INTR
1367 printk("ser_tx_irq(%d): 1\n",info->line);
1368 printk("**** %d = %d\n",
1370 (1U << (8+1+2*info->line)));
1372 DINTR2(DEBUG_LOG(info->line,"IRQ enable ready_irq %i\n", info->line));
1373 *R_IRQ_MASK1_SET = (1U << (8+1+2*info->line));
1376 static inline void e100_enable_rx_irq(struct e100_serial *info)
1378 if (info->uses_dma_in)
1379 e100_enable_rxdma_irq(info);
1381 e100_enable_serial_data_irq(info);
1383 static inline void e100_disable_rx_irq(struct e100_serial *info)
1385 if (info->uses_dma_in)
1386 e100_disable_rxdma_irq(info);
1388 e100_disable_serial_data_irq(info);
1391 #if defined(CONFIG_ETRAX_RS485)
1392 /* Enable RS-485 mode on selected port. This is UGLY. */
1394 e100_enable_rs485(struct tty_struct *tty, struct serial_rs485 *r)
1396 struct e100_serial * info = (struct e100_serial *)tty->driver_data;
1398 #if defined(CONFIG_ETRAX_RS485_ON_PA)
1399 *R_PORT_PA_DATA = port_pa_data_shadow |= (1 << rs485_pa_bit);
1401 #if defined(CONFIG_ETRAX_RS485_ON_PORT_G)
1402 REG_SHADOW_SET(R_PORT_G_DATA, port_g_data_shadow,
1403 rs485_port_g_bit, 1);
1405 #if defined(CONFIG_ETRAX_RS485_LTC1387)
1406 REG_SHADOW_SET(R_PORT_G_DATA, port_g_data_shadow,
1407 CONFIG_ETRAX_RS485_LTC1387_DXEN_PORT_G_BIT, 1);
1408 REG_SHADOW_SET(R_PORT_G_DATA, port_g_data_shadow,
1409 CONFIG_ETRAX_RS485_LTC1387_RXEN_PORT_G_BIT, 1);
1412 info->rs485.flags = r->flags;
1413 if (r->delay_rts_before_send >= 1000)
1414 info->rs485.delay_rts_before_send = 1000;
1416 info->rs485.delay_rts_before_send = r->delay_rts_before_send;
1417 /* printk("rts: on send = %i, after = %i, enabled = %i",
1418 info->rs485.rts_on_send,
1419 info->rs485.rts_after_sent,
1427 e100_write_rs485(struct tty_struct *tty,
1428 const unsigned char *buf, int count)
1430 struct e100_serial * info = (struct e100_serial *)tty->driver_data;
1431 int old_value = (info->rs485.flags) & SER_RS485_ENABLED;
1433 /* rs485 is always implicitly enabled if we're using the ioctl()
1434 * but it doesn't have to be set in the serial_rs485
1435 * (to be backward compatible with old apps)
1436 * So we store, set and restore it.
1438 info->rs485.flags |= SER_RS485_ENABLED;
1439 /* rs_write now deals with RS485 if enabled */
1440 count = rs_write(tty, buf, count);
1442 info->rs485.flags &= ~(SER_RS485_ENABLED);
1446 #ifdef CONFIG_ETRAX_FAST_TIMER
1447 /* Timer function to toggle RTS when using FAST_TIMER */
1448 static void rs485_toggle_rts_timer_function(unsigned long data)
1450 struct e100_serial *info = (struct e100_serial *)data;
1452 fast_timers_rs485[info->line].function = NULL;
1453 e100_rts(info, (info->rs485.flags & SER_RS485_RTS_AFTER_SEND));
1454 #if defined(CONFIG_ETRAX_RS485_DISABLE_RECEIVER)
1455 e100_enable_rx(info);
1456 e100_enable_rx_irq(info);
1460 #endif /* CONFIG_ETRAX_RS485 */
1463 * ------------------------------------------------------------
1464 * rs_stop() and rs_start()
1466 * This routines are called before setting or resetting tty->stopped.
1467 * They enable or disable transmitter using the XOFF registers, as necessary.
1468 * ------------------------------------------------------------
1472 rs_stop(struct tty_struct *tty)
1474 struct e100_serial *info = (struct e100_serial *)tty->driver_data;
1476 unsigned long flags;
1479 local_irq_save(flags);
1480 DFLOW(DEBUG_LOG(info->line, "XOFF rs_stop xmit %i\n",
1481 CIRC_CNT(info->xmit.head,
1482 info->xmit.tail,SERIAL_XMIT_SIZE)));
1484 xoff = IO_FIELD(R_SERIAL0_XOFF, xoff_char,
1485 STOP_CHAR(info->port.tty));
1486 xoff |= IO_STATE(R_SERIAL0_XOFF, tx_stop, stop);
1487 if (tty->termios->c_iflag & IXON ) {
1488 xoff |= IO_STATE(R_SERIAL0_XOFF, auto_xoff, enable);
1491 *((unsigned long *)&info->ioport[REG_XOFF]) = xoff;
1492 local_irq_restore(flags);
1497 rs_start(struct tty_struct *tty)
1499 struct e100_serial *info = (struct e100_serial *)tty->driver_data;
1501 unsigned long flags;
1504 local_irq_save(flags);
1505 DFLOW(DEBUG_LOG(info->line, "XOFF rs_start xmit %i\n",
1506 CIRC_CNT(info->xmit.head,
1507 info->xmit.tail,SERIAL_XMIT_SIZE)));
1508 xoff = IO_FIELD(R_SERIAL0_XOFF, xoff_char, STOP_CHAR(tty));
1509 xoff |= IO_STATE(R_SERIAL0_XOFF, tx_stop, enable);
1510 if (tty->termios->c_iflag & IXON ) {
1511 xoff |= IO_STATE(R_SERIAL0_XOFF, auto_xoff, enable);
1514 *((unsigned long *)&info->ioport[REG_XOFF]) = xoff;
1515 if (!info->uses_dma_out &&
1516 info->xmit.head != info->xmit.tail && info->xmit.buf)
1517 e100_enable_serial_tx_ready_irq(info);
1519 local_irq_restore(flags);
1524 * ----------------------------------------------------------------------
1526 * Here starts the interrupt handling routines. All of the following
1527 * subroutines are declared as inline and are folded into
1528 * rs_interrupt(). They were separated out for readability's sake.
1530 * Note: rs_interrupt() is a "fast" interrupt, which means that it
1531 * runs with interrupts turned off. People who may want to modify
1532 * rs_interrupt() should try to keep the interrupt handler as fast as
1533 * possible. After you are done making modifications, it is not a bad
1536 * gcc -S -DKERNEL -Wall -Wstrict-prototypes -O6 -fomit-frame-pointer serial.c
1538 * and look at the resulting assemble code in serial.s.
1540 * - Ted Ts'o (tytso@mit.edu), 7-Mar-93
1541 * -----------------------------------------------------------------------
1545 * This routine is used by the interrupt handler to schedule
1546 * processing in the software interrupt portion of the driver.
1548 static void rs_sched_event(struct e100_serial *info, int event)
1550 if (info->event & (1 << event))
1552 info->event |= 1 << event;
1553 schedule_work(&info->work);
1556 /* The output DMA channel is free - use it to send as many chars as possible
1558 * We don't pay attention to info->x_char, which means if the TTY wants to
1559 * use XON/XOFF it will set info->x_char but we won't send any X char!
1561 * To implement this, we'd just start a DMA send of 1 byte pointing at a
1562 * buffer containing the X char, and skip updating xmit. We'd also have to
1563 * check if the last sent char was the X char when we enter this function
1564 * the next time, to avoid updating xmit with the sent X value.
1568 transmit_chars_dma(struct e100_serial *info)
1570 unsigned int c, sentl;
1571 struct etrax_dma_descr *descr;
1573 #ifdef CONFIG_SVINTO_SIM
1574 /* This will output too little if tail is not 0 always since
1575 * we don't reloop to send the other part. Anyway this SHOULD be a
1576 * no-op - transmit_chars_dma would never really be called during sim
1577 * since rs_write does not write into the xmit buffer then.
1579 if (info->xmit.tail)
1580 printk("Error in serial.c:transmit_chars-dma(), tail!=0\n");
1581 if (info->xmit.head != info->xmit.tail) {
1582 SIMCOUT(info->xmit.buf + info->xmit.tail,
1583 CIRC_CNT(info->xmit.head,
1586 info->xmit.head = info->xmit.tail; /* move back head */
1587 info->tr_running = 0;
1591 /* acknowledge both dma_descr and dma_eop irq in R_DMA_CHx_CLR_INTR */
1592 *info->oclrintradr =
1593 IO_STATE(R_DMA_CH6_CLR_INTR, clr_descr, do) |
1594 IO_STATE(R_DMA_CH6_CLR_INTR, clr_eop, do);
1596 #ifdef SERIAL_DEBUG_INTR
1597 if (info->line == SERIAL_DEBUG_LINE)
1600 if (!info->tr_running) {
1601 /* weirdo... we shouldn't get here! */
1602 printk(KERN_WARNING "Achtung: transmit_chars_dma with !tr_running\n");
1606 descr = &info->tr_descr;
1608 /* first get the amount of bytes sent during the last DMA transfer,
1609 and update xmit accordingly */
1611 /* if the stop bit was not set, all data has been sent */
1612 if (!(descr->status & d_stop)) {
1613 sentl = descr->sw_len;
1615 /* otherwise we find the amount of data sent here */
1616 sentl = descr->hw_len;
1618 DFLOW(DEBUG_LOG(info->line, "TX %i done\n", sentl));
1621 info->icount.tx += sentl;
1623 /* update xmit buffer */
1624 info->xmit.tail = (info->xmit.tail + sentl) & (SERIAL_XMIT_SIZE - 1);
1626 /* if there is only a few chars left in the buf, wake up the blocked
1628 if (CIRC_CNT(info->xmit.head,
1630 SERIAL_XMIT_SIZE) < WAKEUP_CHARS)
1631 rs_sched_event(info, RS_EVENT_WRITE_WAKEUP);
1633 /* find out the largest amount of consecutive bytes we want to send now */
1635 c = CIRC_CNT_TO_END(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
1637 /* Don't send all in one DMA transfer - divide it so we wake up
1638 * application before all is sent
1641 if (c >= 4*WAKEUP_CHARS)
1645 /* our job here is done, don't schedule any new DMA transfer */
1646 info->tr_running = 0;
1648 #if defined(CONFIG_ETRAX_RS485) && defined(CONFIG_ETRAX_FAST_TIMER)
1649 if (info->rs485.flags & SER_RS485_ENABLED) {
1650 /* Set a short timer to toggle RTS */
1651 start_one_shot_timer(&fast_timers_rs485[info->line],
1652 rs485_toggle_rts_timer_function,
1653 (unsigned long)info,
1654 info->char_time_usec*2,
1661 /* ok we can schedule a dma send of c chars starting at info->xmit.tail */
1662 /* set up the descriptor correctly for output */
1663 DFLOW(DEBUG_LOG(info->line, "TX %i\n", c));
1664 descr->ctrl = d_int | d_eol | d_wait; /* Wait needed for tty_wait_until_sent() */
1666 descr->buf = virt_to_phys(info->xmit.buf + info->xmit.tail);
1669 *info->ofirstadr = virt_to_phys(descr); /* write to R_DMAx_FIRST */
1670 *info->ocmdadr = IO_STATE(R_DMA_CH6_CMD, cmd, start);
1672 /* DMA is now running (hopefully) */
1673 } /* transmit_chars_dma */
1676 start_transmit(struct e100_serial *info)
1679 if (info->line == SERIAL_DEBUG_LINE)
1683 info->tr_descr.sw_len = 0;
1684 info->tr_descr.hw_len = 0;
1685 info->tr_descr.status = 0;
1686 info->tr_running = 1;
1687 if (info->uses_dma_out)
1688 transmit_chars_dma(info);
1690 e100_enable_serial_tx_ready_irq(info);
1691 } /* start_transmit */
1693 #ifdef CONFIG_ETRAX_SERIAL_FAST_TIMER
1694 static int serial_fast_timer_started = 0;
1695 static int serial_fast_timer_expired = 0;
1696 static void flush_timeout_function(unsigned long data);
1697 #define START_FLUSH_FAST_TIMER_TIME(info, string, usec) {\
1698 unsigned long timer_flags; \
1699 local_irq_save(timer_flags); \
1700 if (fast_timers[info->line].function == NULL) { \
1701 serial_fast_timer_started++; \
1702 TIMERD(DEBUG_LOG(info->line, "start_timer %i ", info->line)); \
1703 TIMERD(DEBUG_LOG(info->line, "num started: %i\n", serial_fast_timer_started)); \
1704 start_one_shot_timer(&fast_timers[info->line], \
1705 flush_timeout_function, \
1706 (unsigned long)info, \
1711 TIMERD(DEBUG_LOG(info->line, "timer %i already running\n", info->line)); \
1713 local_irq_restore(timer_flags); \
1715 #define START_FLUSH_FAST_TIMER(info, string) START_FLUSH_FAST_TIMER_TIME(info, string, info->flush_time_usec)
1718 #define START_FLUSH_FAST_TIMER_TIME(info, string, usec)
1719 #define START_FLUSH_FAST_TIMER(info, string)
1722 static struct etrax_recv_buffer *
1723 alloc_recv_buffer(unsigned int size)
1725 struct etrax_recv_buffer *buffer;
1727 if (!(buffer = kmalloc(sizeof *buffer + size, GFP_ATOMIC)))
1730 buffer->next = NULL;
1732 buffer->error = TTY_NORMAL;
1738 append_recv_buffer(struct e100_serial *info, struct etrax_recv_buffer *buffer)
1740 unsigned long flags;
1742 local_irq_save(flags);
1744 if (!info->first_recv_buffer)
1745 info->first_recv_buffer = buffer;
1747 info->last_recv_buffer->next = buffer;
1749 info->last_recv_buffer = buffer;
1751 info->recv_cnt += buffer->length;
1752 if (info->recv_cnt > info->max_recv_cnt)
1753 info->max_recv_cnt = info->recv_cnt;
1755 local_irq_restore(flags);
1759 add_char_and_flag(struct e100_serial *info, unsigned char data, unsigned char flag)
1761 struct etrax_recv_buffer *buffer;
1762 if (info->uses_dma_in) {
1763 if (!(buffer = alloc_recv_buffer(4)))
1767 buffer->error = flag;
1768 buffer->buffer[0] = data;
1770 append_recv_buffer(info, buffer);
1774 struct tty_struct *tty = info->port.tty;
1775 tty_insert_flip_char(tty, data, flag);
1782 static unsigned int handle_descr_data(struct e100_serial *info,
1783 struct etrax_dma_descr *descr,
1786 struct etrax_recv_buffer *buffer = phys_to_virt(descr->buf) - sizeof *buffer;
1788 if (info->recv_cnt + recvl > 65536) {
1790 "%s: Too much pending incoming serial data! Dropping %u bytes.\n", __func__, recvl);
1794 buffer->length = recvl;
1796 if (info->errorcode == ERRCODE_SET_BREAK)
1797 buffer->error = TTY_BREAK;
1798 info->errorcode = 0;
1800 append_recv_buffer(info, buffer);
1802 if (!(buffer = alloc_recv_buffer(SERIAL_DESCR_BUF_SIZE)))
1803 panic("%s: Failed to allocate memory for receive buffer!\n", __func__);
1805 descr->buf = virt_to_phys(buffer->buffer);
1810 static unsigned int handle_all_descr_data(struct e100_serial *info)
1812 struct etrax_dma_descr *descr;
1814 unsigned int ret = 0;
1818 descr = &info->rec_descr[info->cur_rec_descr];
1820 if (descr == phys_to_virt(*info->idescradr))
1823 if (++info->cur_rec_descr == SERIAL_RECV_DESCRIPTORS)
1824 info->cur_rec_descr = 0;
1826 /* find out how many bytes were read */
1828 /* if the eop bit was not set, all data has been received */
1829 if (!(descr->status & d_eop)) {
1830 recvl = descr->sw_len;
1832 /* otherwise we find the amount of data received here */
1833 recvl = descr->hw_len;
1836 /* Reset the status information */
1839 DFLOW( DEBUG_LOG(info->line, "RX %lu\n", recvl);
1840 if (info->port.tty->stopped) {
1841 unsigned char *buf = phys_to_virt(descr->buf);
1842 DEBUG_LOG(info->line, "rx 0x%02X\n", buf[0]);
1843 DEBUG_LOG(info->line, "rx 0x%02X\n", buf[1]);
1844 DEBUG_LOG(info->line, "rx 0x%02X\n", buf[2]);
1849 info->icount.rx += recvl;
1851 ret += handle_descr_data(info, descr, recvl);
1857 static void receive_chars_dma(struct e100_serial *info)
1859 struct tty_struct *tty;
1860 unsigned char rstat;
1862 #ifdef CONFIG_SVINTO_SIM
1863 /* No receive in the simulator. Will probably be when the rest of
1864 * the serial interface works, and this piece will just be removed.
1869 /* Acknowledge both dma_descr and dma_eop irq in R_DMA_CHx_CLR_INTR */
1870 *info->iclrintradr =
1871 IO_STATE(R_DMA_CH6_CLR_INTR, clr_descr, do) |
1872 IO_STATE(R_DMA_CH6_CLR_INTR, clr_eop, do);
1874 tty = info->port.tty;
1875 if (!tty) /* Something wrong... */
1878 #ifdef SERIAL_HANDLE_EARLY_ERRORS
1879 if (info->uses_dma_in)
1880 e100_enable_serial_data_irq(info);
1883 if (info->errorcode == ERRCODE_INSERT_BREAK)
1884 add_char_and_flag(info, '\0', TTY_BREAK);
1886 handle_all_descr_data(info);
1888 /* Read the status register to detect errors */
1889 rstat = info->ioport[REG_STATUS];
1890 if (rstat & IO_MASK(R_SERIAL0_STATUS, xoff_detect) ) {
1891 DFLOW(DEBUG_LOG(info->line, "XOFF detect stat %x\n", rstat));
1894 if (rstat & SER_ERROR_MASK) {
1895 /* If we got an error, we must reset it by reading the
1898 unsigned char data = info->ioport[REG_DATA];
1900 PROCSTAT(ser_stat[info->line].errors_cnt++);
1901 DEBUG_LOG(info->line, "#dERR: s d 0x%04X\n",
1902 ((rstat & SER_ERROR_MASK) << 8) | data);
1904 if (rstat & SER_PAR_ERR_MASK)
1905 add_char_and_flag(info, data, TTY_PARITY);
1906 else if (rstat & SER_OVERRUN_MASK)
1907 add_char_and_flag(info, data, TTY_OVERRUN);
1908 else if (rstat & SER_FRAMING_ERR_MASK)
1909 add_char_and_flag(info, data, TTY_FRAME);
1912 START_FLUSH_FAST_TIMER(info, "receive_chars");
1914 /* Restart the receiving DMA */
1915 *info->icmdadr = IO_STATE(R_DMA_CH6_CMD, cmd, restart);
1918 static int start_recv_dma(struct e100_serial *info)
1920 struct etrax_dma_descr *descr = info->rec_descr;
1921 struct etrax_recv_buffer *buffer;
1924 /* Set up the receiving descriptors */
1925 for (i = 0; i < SERIAL_RECV_DESCRIPTORS; i++) {
1926 if (!(buffer = alloc_recv_buffer(SERIAL_DESCR_BUF_SIZE)))
1927 panic("%s: Failed to allocate memory for receive buffer!\n", __func__);
1929 descr[i].ctrl = d_int;
1930 descr[i].buf = virt_to_phys(buffer->buffer);
1931 descr[i].sw_len = SERIAL_DESCR_BUF_SIZE;
1932 descr[i].hw_len = 0;
1933 descr[i].status = 0;
1934 descr[i].next = virt_to_phys(&descr[i+1]);
1937 /* Link the last descriptor to the first */
1938 descr[i-1].next = virt_to_phys(&descr[0]);
1940 /* Start with the first descriptor in the list */
1941 info->cur_rec_descr = 0;
1944 *info->ifirstadr = virt_to_phys(&descr[info->cur_rec_descr]);
1945 *info->icmdadr = IO_STATE(R_DMA_CH6_CMD, cmd, start);
1947 /* Input DMA should be running now */
1952 start_receive(struct e100_serial *info)
1954 #ifdef CONFIG_SVINTO_SIM
1955 /* No receive in the simulator. Will probably be when the rest of
1956 * the serial interface works, and this piece will just be removed.
1960 if (info->uses_dma_in) {
1961 /* reset the input dma channel to be sure it works */
1963 *info->icmdadr = IO_STATE(R_DMA_CH6_CMD, cmd, reset);
1964 while (IO_EXTRACT(R_DMA_CH6_CMD, cmd, *info->icmdadr) ==
1965 IO_STATE_VALUE(R_DMA_CH6_CMD, cmd, reset));
1967 start_recv_dma(info);
1972 /* the bits in the MASK2 register are laid out like this:
1973 DMAI_EOP DMAI_DESCR DMAO_EOP DMAO_DESCR
1974 where I is the input channel and O is the output channel for the port.
1975 info->irq is the bit number for the DMAO_DESCR so to check the others we
1976 shift info->irq to the left.
1979 /* dma output channel interrupt handler
1980 this interrupt is called from DMA2(ser2), DMA4(ser3), DMA6(ser0) or
1981 DMA8(ser1) when they have finished a descriptor with the intr flag set.
1985 tr_interrupt(int irq, void *dev_id)
1987 struct e100_serial *info;
1992 #ifdef CONFIG_SVINTO_SIM
1993 /* No receive in the simulator. Will probably be when the rest of
1994 * the serial interface works, and this piece will just be removed.
1997 const char *s = "What? tr_interrupt in simulator??\n";
1998 SIMCOUT(s,strlen(s));
2003 /* find out the line that caused this irq and get it from rs_table */
2005 ireg = *R_IRQ_MASK2_RD; /* get the active irq bits for the dma channels */
2007 for (i = 0; i < NR_PORTS; i++) {
2008 info = rs_table + i;
2009 if (!info->enabled || !info->uses_dma_out)
2011 /* check for dma_descr (don't need to check for dma_eop in output dma for serial */
2012 if (ireg & info->irq) {
2014 /* we can send a new dma bunch. make it so. */
2015 DINTR2(DEBUG_LOG(info->line, "tr_interrupt %i\n", i));
2016 /* Read jiffies_usec first,
2017 * we want this time to be as late as possible
2019 PROCSTAT(ser_stat[info->line].tx_dma_ints++);
2020 info->last_tx_active_usec = GET_JIFFIES_USEC();
2021 info->last_tx_active = jiffies;
2022 transmit_chars_dma(info);
2025 /* FIXME: here we should really check for a change in the
2026 status lines and if so call status_handle(info) */
2028 return IRQ_RETVAL(handled);
2029 } /* tr_interrupt */
2031 /* dma input channel interrupt handler */
2034 rec_interrupt(int irq, void *dev_id)
2036 struct e100_serial *info;
2041 #ifdef CONFIG_SVINTO_SIM
2042 /* No receive in the simulator. Will probably be when the rest of
2043 * the serial interface works, and this piece will just be removed.
2046 const char *s = "What? rec_interrupt in simulator??\n";
2047 SIMCOUT(s,strlen(s));
2052 /* find out the line that caused this irq and get it from rs_table */
2054 ireg = *R_IRQ_MASK2_RD; /* get the active irq bits for the dma channels */
2056 for (i = 0; i < NR_PORTS; i++) {
2057 info = rs_table + i;
2058 if (!info->enabled || !info->uses_dma_in)
2060 /* check for both dma_eop and dma_descr for the input dma channel */
2061 if (ireg & ((info->irq << 2) | (info->irq << 3))) {
2063 /* we have received something */
2064 receive_chars_dma(info);
2067 /* FIXME: here we should really check for a change in the
2068 status lines and if so call status_handle(info) */
2070 return IRQ_RETVAL(handled);
2071 } /* rec_interrupt */
2073 static int force_eop_if_needed(struct e100_serial *info)
2075 /* We check data_avail bit to determine if data has
2076 * arrived since last time
2078 unsigned char rstat = info->ioport[REG_STATUS];
2080 /* error or datavail? */
2081 if (rstat & SER_ERROR_MASK) {
2082 /* Some error has occurred. If there has been valid data, an
2083 * EOP interrupt will be made automatically. If no data, the
2084 * normal ser_interrupt should be enabled and handle it.
2087 DEBUG_LOG(info->line, "timeout err: rstat 0x%03X\n",
2088 rstat | (info->line << 8));
2092 if (rstat & SER_DATA_AVAIL_MASK) {
2093 /* Ok data, no error, count it */
2094 TIMERD(DEBUG_LOG(info->line, "timeout: rstat 0x%03X\n",
2095 rstat | (info->line << 8)));
2096 /* Read data to clear status flags */
2097 (void)info->ioport[REG_DATA];
2099 info->forced_eop = 0;
2100 START_FLUSH_FAST_TIMER(info, "magic");
2104 /* hit the timeout, force an EOP for the input
2105 * dma channel if we haven't already
2107 if (!info->forced_eop) {
2108 info->forced_eop = 1;
2109 PROCSTAT(ser_stat[info->line].timeout_flush_cnt++);
2110 TIMERD(DEBUG_LOG(info->line, "timeout EOP %i\n", info->line));
2117 static void flush_to_flip_buffer(struct e100_serial *info)
2119 struct tty_struct *tty;
2120 struct etrax_recv_buffer *buffer;
2121 unsigned long flags;
2123 local_irq_save(flags);
2124 tty = info->port.tty;
2127 local_irq_restore(flags);
2131 while ((buffer = info->first_recv_buffer) != NULL) {
2132 unsigned int count = buffer->length;
2134 tty_insert_flip_string(tty, buffer->buffer, count);
2135 info->recv_cnt -= count;
2137 if (count == buffer->length) {
2138 info->first_recv_buffer = buffer->next;
2141 buffer->length -= count;
2142 memmove(buffer->buffer, buffer->buffer + count, buffer->length);
2143 buffer->error = TTY_NORMAL;
2147 if (!info->first_recv_buffer)
2148 info->last_recv_buffer = NULL;
2150 local_irq_restore(flags);
2152 /* This includes a check for low-latency */
2153 tty_flip_buffer_push(tty);
2156 static void check_flush_timeout(struct e100_serial *info)
2158 /* Flip what we've got (if we can) */
2159 flush_to_flip_buffer(info);
2161 /* We might need to flip later, but not to fast
2162 * since the system is busy processing input... */
2163 if (info->first_recv_buffer)
2164 START_FLUSH_FAST_TIMER_TIME(info, "flip", 2000);
2166 /* Force eop last, since data might have come while we're processing
2167 * and if we started the slow timer above, we won't start a fast
2170 force_eop_if_needed(info);
2173 #ifdef CONFIG_ETRAX_SERIAL_FAST_TIMER
2174 static void flush_timeout_function(unsigned long data)
2176 struct e100_serial *info = (struct e100_serial *)data;
2178 fast_timers[info->line].function = NULL;
2179 serial_fast_timer_expired++;
2180 TIMERD(DEBUG_LOG(info->line, "flush_timout %i ", info->line));
2181 TIMERD(DEBUG_LOG(info->line, "num expired: %i\n", serial_fast_timer_expired));
2182 check_flush_timeout(info);
2187 /* dma fifo/buffer timeout handler
2188 forces an end-of-packet for the dma input channel if no chars
2189 have been received for CONFIG_ETRAX_SERIAL_RX_TIMEOUT_TICKS/100 s.
2192 static struct timer_list flush_timer;
2195 timed_flush_handler(unsigned long ptr)
2197 struct e100_serial *info;
2200 #ifdef CONFIG_SVINTO_SIM
2204 for (i = 0; i < NR_PORTS; i++) {
2205 info = rs_table + i;
2206 if (info->uses_dma_in)
2207 check_flush_timeout(info);
2210 /* restart flush timer */
2211 mod_timer(&flush_timer, jiffies + CONFIG_ETRAX_SERIAL_RX_TIMEOUT_TICKS);
2215 #ifdef SERIAL_HANDLE_EARLY_ERRORS
2217 /* If there is an error (ie break) when the DMA is running and
2218 * there are no bytes in the fifo the DMA is stopped and we get no
2219 * eop interrupt. Thus we have to monitor the first bytes on a DMA
2220 * transfer, and if it is without error we can turn the serial
2225 BREAK handling on ETRAX 100:
2226 ETRAX will generate interrupt although there is no stop bit between the
2229 Depending on how long the break sequence is, the end of the breaksequence
2230 will look differently:
2231 | indicates start/end of a character.
2233 B= Break character (0x00) with framing error.
2234 E= Error byte with parity error received after B characters.
2235 F= "Faked" valid byte received immediately after B characters.
2239 B BL ___________________________ V
2240 .._|__________|__________| |valid data |
2242 Multiple frame errors with data == 0x00 (B),
2243 the timing matches up "perfectly" so no extra ending char is detected.
2244 The RXD pin is 1 in the last interrupt, in that case
2245 we set info->errorcode = ERRCODE_INSERT_BREAK, but we can't really
2246 know if another byte will come and this really is case 2. below
2247 (e.g F=0xFF or 0xFE)
2248 If RXD pin is 0 we can expect another character (see 2. below).
2253 B B E or F__________________..__ V
2254 .._|__________|__________|______ | |valid data
2258 Multiple frame errors with data == 0x00 (B),
2259 but the part of the break trigs is interpreted as a start bit (and possibly
2260 some 0 bits followed by a number of 1 bits and a stop bit).
2261 Depending on parity settings etc. this last character can be either
2262 a fake "valid" char (F) or have a parity error (E).
2264 If the character is valid it will be put in the buffer,
2265 we set info->errorcode = ERRCODE_SET_BREAK so the receive interrupt
2266 will set the flags so the tty will handle it,
2267 if it's an error byte it will not be put in the buffer
2268 and we set info->errorcode = ERRCODE_INSERT_BREAK.
2270 To distinguish a V byte in 1. from an F byte in 2. we keep a timestamp
2271 of the last faulty char (B) and compares it with the current time:
2272 If the time elapsed time is less then 2*char_time_usec we will assume
2273 it's a faked F char and not a Valid char and set
2274 info->errorcode = ERRCODE_SET_BREAK.
2276 Flaws in the above solution:
2277 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
2278 We use the timer to distinguish a F character from a V character,
2279 if a V character is to close after the break we might make the wrong decision.
2281 TODO: The break will be delayed until an F or V character is received.
2286 struct e100_serial * handle_ser_rx_interrupt_no_dma(struct e100_serial *info)
2288 unsigned long data_read;
2289 struct tty_struct *tty = info->port.tty;
2292 printk("!NO TTY!\n");
2296 /* Read data and status at the same time */
2297 data_read = *((unsigned long *)&info->ioport[REG_DATA_STATUS32]);
2299 if (data_read & IO_MASK(R_SERIAL0_READ, xoff_detect) ) {
2300 DFLOW(DEBUG_LOG(info->line, "XOFF detect\n", 0));
2302 DINTR2(DEBUG_LOG(info->line, "ser_rx %c\n", IO_EXTRACT(R_SERIAL0_READ, data_in, data_read)));
2304 if (data_read & ( IO_MASK(R_SERIAL0_READ, framing_err) |
2305 IO_MASK(R_SERIAL0_READ, par_err) |
2306 IO_MASK(R_SERIAL0_READ, overrun) )) {
2308 info->last_rx_active_usec = GET_JIFFIES_USEC();
2309 info->last_rx_active = jiffies;
2310 DINTR1(DEBUG_LOG(info->line, "ser_rx err stat_data %04X\n", data_read));
2312 if (!log_int_trig1_pos) {
2313 log_int_trig1_pos = log_int_pos;
2314 log_int(rdpc(), 0, 0);
2319 if ( ((data_read & IO_MASK(R_SERIAL0_READ, data_in)) == 0) &&
2320 (data_read & IO_MASK(R_SERIAL0_READ, framing_err)) ) {
2321 /* Most likely a break, but we get interrupts over and
2325 if (!info->break_detected_cnt) {
2326 DEBUG_LOG(info->line, "#BRK start\n", 0);
2328 if (data_read & IO_MASK(R_SERIAL0_READ, rxd)) {
2329 /* The RX pin is high now, so the break
2330 * must be over, but....
2331 * we can't really know if we will get another
2332 * last byte ending the break or not.
2333 * And we don't know if the byte (if any) will
2334 * have an error or look valid.
2336 DEBUG_LOG(info->line, "# BL BRK\n", 0);
2337 info->errorcode = ERRCODE_INSERT_BREAK;
2339 info->break_detected_cnt++;
2341 /* The error does not look like a break, but could be
2344 if (info->break_detected_cnt) {
2345 DEBUG_LOG(info->line, "EBRK %i\n", info->break_detected_cnt);
2346 info->errorcode = ERRCODE_INSERT_BREAK;
2348 unsigned char data = IO_EXTRACT(R_SERIAL0_READ,
2349 data_in, data_read);
2350 char flag = TTY_NORMAL;
2351 if (info->errorcode == ERRCODE_INSERT_BREAK) {
2352 struct tty_struct *tty = info->port.tty;
2353 tty_insert_flip_char(tty, 0, flag);
2357 if (data_read & IO_MASK(R_SERIAL0_READ, par_err)) {
2358 info->icount.parity++;
2360 } else if (data_read & IO_MASK(R_SERIAL0_READ, overrun)) {
2361 info->icount.overrun++;
2363 } else if (data_read & IO_MASK(R_SERIAL0_READ, framing_err)) {
2364 info->icount.frame++;
2367 tty_insert_flip_char(tty, data, flag);
2368 info->errorcode = 0;
2370 info->break_detected_cnt = 0;
2372 } else if (data_read & IO_MASK(R_SERIAL0_READ, data_avail)) {
2375 if (!log_int_trig1_pos) {
2376 if (log_int_pos >= log_int_size) {
2379 log_int_trig0_pos = log_int_pos;
2380 log_int(rdpc(), 0, 0);
2383 tty_insert_flip_char(tty,
2384 IO_EXTRACT(R_SERIAL0_READ, data_in, data_read),
2387 DEBUG_LOG(info->line, "ser_rx int but no data_avail %08lX\n", data_read);
2392 data_read = *((unsigned long *)&info->ioport[REG_DATA_STATUS32]);
2393 if (data_read & IO_MASK(R_SERIAL0_READ, data_avail)) {
2394 DEBUG_LOG(info->line, "ser_rx %c in loop\n", IO_EXTRACT(R_SERIAL0_READ, data_in, data_read));
2398 tty_flip_buffer_push(info->port.tty);
2402 static struct e100_serial* handle_ser_rx_interrupt(struct e100_serial *info)
2404 unsigned char rstat;
2406 #ifdef SERIAL_DEBUG_INTR
2407 printk("Interrupt from serport %d\n", i);
2409 /* DEBUG_LOG(info->line, "ser_interrupt stat %03X\n", rstat | (i << 8)); */
2410 if (!info->uses_dma_in) {
2411 return handle_ser_rx_interrupt_no_dma(info);
2414 rstat = info->ioport[REG_STATUS];
2415 if (rstat & IO_MASK(R_SERIAL0_STATUS, xoff_detect) ) {
2416 DFLOW(DEBUG_LOG(info->line, "XOFF detect\n", 0));
2419 if (rstat & SER_ERROR_MASK) {
2422 info->last_rx_active_usec = GET_JIFFIES_USEC();
2423 info->last_rx_active = jiffies;
2424 /* If we got an error, we must reset it by reading the
2427 data = info->ioport[REG_DATA];
2428 DINTR1(DEBUG_LOG(info->line, "ser_rx! %c\n", data));
2429 DINTR1(DEBUG_LOG(info->line, "ser_rx err stat %02X\n", rstat));
2430 if (!data && (rstat & SER_FRAMING_ERR_MASK)) {
2431 /* Most likely a break, but we get interrupts over and
2435 if (!info->break_detected_cnt) {
2436 DEBUG_LOG(info->line, "#BRK start\n", 0);
2438 if (rstat & SER_RXD_MASK) {
2439 /* The RX pin is high now, so the break
2440 * must be over, but....
2441 * we can't really know if we will get another
2442 * last byte ending the break or not.
2443 * And we don't know if the byte (if any) will
2444 * have an error or look valid.
2446 DEBUG_LOG(info->line, "# BL BRK\n", 0);
2447 info->errorcode = ERRCODE_INSERT_BREAK;
2449 info->break_detected_cnt++;
2451 /* The error does not look like a break, but could be
2454 if (info->break_detected_cnt) {
2455 DEBUG_LOG(info->line, "EBRK %i\n", info->break_detected_cnt);
2456 info->errorcode = ERRCODE_INSERT_BREAK;
2458 if (info->errorcode == ERRCODE_INSERT_BREAK) {
2460 add_char_and_flag(info, '\0', TTY_BREAK);
2463 if (rstat & SER_PAR_ERR_MASK) {
2464 info->icount.parity++;
2465 add_char_and_flag(info, data, TTY_PARITY);
2466 } else if (rstat & SER_OVERRUN_MASK) {
2467 info->icount.overrun++;
2468 add_char_and_flag(info, data, TTY_OVERRUN);
2469 } else if (rstat & SER_FRAMING_ERR_MASK) {
2470 info->icount.frame++;
2471 add_char_and_flag(info, data, TTY_FRAME);
2474 info->errorcode = 0;
2476 info->break_detected_cnt = 0;
2477 DEBUG_LOG(info->line, "#iERR s d %04X\n",
2478 ((rstat & SER_ERROR_MASK) << 8) | data);
2480 PROCSTAT(ser_stat[info->line].early_errors_cnt++);
2481 } else { /* It was a valid byte, now let the DMA do the rest */
2482 unsigned long curr_time_u = GET_JIFFIES_USEC();
2483 unsigned long curr_time = jiffies;
2485 if (info->break_detected_cnt) {
2486 /* Detect if this character is a new valid char or the
2487 * last char in a break sequence: If LSBits are 0 and
2488 * MSBits are high AND the time is close to the
2489 * previous interrupt we should discard it.
2492 (curr_time - info->last_rx_active) * (1000000/HZ) +
2493 curr_time_u - info->last_rx_active_usec;
2494 if (elapsed_usec < 2*info->char_time_usec) {
2495 DEBUG_LOG(info->line, "FBRK %i\n", info->line);
2496 /* Report as BREAK (error) and let
2497 * receive_chars_dma() handle it
2499 info->errorcode = ERRCODE_SET_BREAK;
2501 DEBUG_LOG(info->line, "Not end of BRK (V)%i\n", info->line);
2503 DEBUG_LOG(info->line, "num brk %i\n", info->break_detected_cnt);
2506 #ifdef SERIAL_DEBUG_INTR
2507 printk("** OK, disabling ser_interrupts\n");
2509 e100_disable_serial_data_irq(info);
2510 DINTR2(DEBUG_LOG(info->line, "ser_rx OK %d\n", info->line));
2511 info->break_detected_cnt = 0;
2513 PROCSTAT(ser_stat[info->line].ser_ints_ok_cnt++);
2515 /* Restarting the DMA never hurts */
2516 *info->icmdadr = IO_STATE(R_DMA_CH6_CMD, cmd, restart);
2517 START_FLUSH_FAST_TIMER(info, "ser_int");
2519 } /* handle_ser_rx_interrupt */
2521 static void handle_ser_tx_interrupt(struct e100_serial *info)
2523 unsigned long flags;
2526 unsigned char rstat;
2527 DFLOW(DEBUG_LOG(info->line, "tx_int: xchar 0x%02X\n", info->x_char));
2528 local_irq_save(flags);
2529 rstat = info->ioport[REG_STATUS];
2530 DFLOW(DEBUG_LOG(info->line, "stat %x\n", rstat));
2532 info->ioport[REG_TR_DATA] = info->x_char;
2535 /* We must enable since it is disabled in ser_interrupt */
2536 e100_enable_serial_tx_ready_irq(info);
2537 local_irq_restore(flags);
2540 if (info->uses_dma_out) {
2541 unsigned char rstat;
2543 /* We only use normal tx interrupt when sending x_char */
2544 DFLOW(DEBUG_LOG(info->line, "tx_int: xchar sent\n", 0));
2545 local_irq_save(flags);
2546 rstat = info->ioport[REG_STATUS];
2547 DFLOW(DEBUG_LOG(info->line, "stat %x\n", rstat));
2548 e100_disable_serial_tx_ready_irq(info);
2549 if (info->port.tty->stopped)
2550 rs_stop(info->port.tty);
2551 /* Enable the DMA channel and tell it to continue */
2552 e100_enable_txdma_channel(info);
2553 /* Wait 12 cycles before doing the DMA command */
2554 for(i = 6; i > 0; i--)
2557 *info->ocmdadr = IO_STATE(R_DMA_CH6_CMD, cmd, continue);
2558 local_irq_restore(flags);
2561 /* Normal char-by-char interrupt */
2562 if (info->xmit.head == info->xmit.tail
2563 || info->port.tty->stopped
2564 || info->port.tty->hw_stopped) {
2565 DFLOW(DEBUG_LOG(info->line, "tx_int: stopped %i\n",
2566 info->port.tty->stopped));
2567 e100_disable_serial_tx_ready_irq(info);
2568 info->tr_running = 0;
2571 DINTR2(DEBUG_LOG(info->line, "tx_int %c\n", info->xmit.buf[info->xmit.tail]));
2572 /* Send a byte, rs485 timing is critical so turn of ints */
2573 local_irq_save(flags);
2574 info->ioport[REG_TR_DATA] = info->xmit.buf[info->xmit.tail];
2575 info->xmit.tail = (info->xmit.tail + 1) & (SERIAL_XMIT_SIZE-1);
2577 if (info->xmit.head == info->xmit.tail) {
2578 #if defined(CONFIG_ETRAX_RS485) && defined(CONFIG_ETRAX_FAST_TIMER)
2579 if (info->rs485.flags & SER_RS485_ENABLED) {
2580 /* Set a short timer to toggle RTS */
2581 start_one_shot_timer(&fast_timers_rs485[info->line],
2582 rs485_toggle_rts_timer_function,
2583 (unsigned long)info,
2584 info->char_time_usec*2,
2588 info->last_tx_active_usec = GET_JIFFIES_USEC();
2589 info->last_tx_active = jiffies;
2590 e100_disable_serial_tx_ready_irq(info);
2591 info->tr_running = 0;
2592 DFLOW(DEBUG_LOG(info->line, "tx_int: stop2\n", 0));
2594 /* We must enable since it is disabled in ser_interrupt */
2595 e100_enable_serial_tx_ready_irq(info);
2597 local_irq_restore(flags);
2599 if (CIRC_CNT(info->xmit.head,
2601 SERIAL_XMIT_SIZE) < WAKEUP_CHARS)
2602 rs_sched_event(info, RS_EVENT_WRITE_WAKEUP);
2604 } /* handle_ser_tx_interrupt */
2606 /* result of time measurements:
2607 * RX duration 54-60 us when doing something, otherwise 6-9 us
2608 * ser_int duration: just sending: 8-15 us normally, up to 73 us
2611 ser_interrupt(int irq, void *dev_id)
2613 static volatile int tx_started = 0;
2614 struct e100_serial *info;
2616 unsigned long flags;
2617 unsigned long irq_mask1_rd;
2618 unsigned long data_mask = (1 << (8+2*0)); /* ser0 data_avail */
2620 static volatile unsigned long reentered_ready_mask = 0;
2622 local_irq_save(flags);
2623 irq_mask1_rd = *R_IRQ_MASK1_RD;
2624 /* First handle all rx interrupts with ints disabled */
2626 irq_mask1_rd &= e100_ser_int_mask;
2627 for (i = 0; i < NR_PORTS; i++) {
2628 /* Which line caused the data irq? */
2629 if (irq_mask1_rd & data_mask) {
2631 handle_ser_rx_interrupt(info);
2636 /* Handle tx interrupts with interrupts enabled so we
2637 * can take care of new data interrupts while transmitting
2638 * We protect the tx part with the tx_started flag.
2639 * We disable the tr_ready interrupts we are about to handle and
2640 * unblock the serial interrupt so new serial interrupts may come.
2642 * If we get a new interrupt:
2643 * - it migth be due to synchronous serial ports.
2644 * - serial irq will be blocked by general irq handler.
2645 * - async data will be handled above (sync will be ignored).
2646 * - tx_started flag will prevent us from trying to send again and
2647 * we will exit fast - no need to unblock serial irq.
2648 * - Next (sync) serial interrupt handler will be runned with
2649 * disabled interrupt due to restore_flags() at end of function,
2650 * so sync handler will not be preempted or reentered.
2653 unsigned long ready_mask;
2656 /* Only the tr_ready interrupts left */
2657 irq_mask1_rd &= (IO_MASK(R_IRQ_MASK1_RD, ser0_ready) |
2658 IO_MASK(R_IRQ_MASK1_RD, ser1_ready) |
2659 IO_MASK(R_IRQ_MASK1_RD, ser2_ready) |
2660 IO_MASK(R_IRQ_MASK1_RD, ser3_ready));
2661 while (irq_mask1_rd) {
2662 /* Disable those we are about to handle */
2663 *R_IRQ_MASK1_CLR = irq_mask1_rd;
2664 /* Unblock the serial interrupt */
2665 *R_VECT_MASK_SET = IO_STATE(R_VECT_MASK_SET, serial, set);
2668 ready_mask = (1 << (8+1+2*0)); /* ser0 tr_ready */
2670 for (i = 0; i < NR_PORTS; i++) {
2671 /* Which line caused the ready irq? */
2672 if (irq_mask1_rd & ready_mask) {
2674 handle_ser_tx_interrupt(info);
2679 /* handle_ser_tx_interrupt enables tr_ready interrupts */
2680 local_irq_disable();
2681 /* Handle reentered TX interrupt */
2682 irq_mask1_rd = reentered_ready_mask;
2684 local_irq_disable();
2687 unsigned long ready_mask;
2688 ready_mask = irq_mask1_rd & (IO_MASK(R_IRQ_MASK1_RD, ser0_ready) |
2689 IO_MASK(R_IRQ_MASK1_RD, ser1_ready) |
2690 IO_MASK(R_IRQ_MASK1_RD, ser2_ready) |
2691 IO_MASK(R_IRQ_MASK1_RD, ser3_ready));
2693 reentered_ready_mask |= ready_mask;
2694 /* Disable those we are about to handle */
2695 *R_IRQ_MASK1_CLR = ready_mask;
2696 DFLOW(DEBUG_LOG(SERIAL_DEBUG_LINE, "ser_int reentered with TX %X\n", ready_mask));
2700 local_irq_restore(flags);
2701 return IRQ_RETVAL(handled);
2702 } /* ser_interrupt */
2706 * -------------------------------------------------------------------
2707 * Here ends the serial interrupt routines.
2708 * -------------------------------------------------------------------
2712 * This routine is used to handle the "bottom half" processing for the
2713 * serial driver, known also the "software interrupt" processing.
2714 * This processing is done at the kernel interrupt level, after the
2715 * rs_interrupt() has returned, BUT WITH INTERRUPTS TURNED ON. This
2716 * is where time-consuming activities which can not be done in the
2717 * interrupt driver proper are done; the interrupt driver schedules
2718 * them using rs_sched_event(), and they get done here.
2721 do_softint(struct work_struct *work)
2723 struct e100_serial *info;
2724 struct tty_struct *tty;
2726 info = container_of(work, struct e100_serial, work);
2728 tty = info->port.tty;
2732 if (test_and_clear_bit(RS_EVENT_WRITE_WAKEUP, &info->event))
2737 startup(struct e100_serial * info)
2739 unsigned long flags;
2740 unsigned long xmit_page;
2743 xmit_page = get_zeroed_page(GFP_KERNEL);
2747 local_irq_save(flags);
2749 /* if it was already initialized, skip this */
2751 if (info->flags & ASYNC_INITIALIZED) {
2752 local_irq_restore(flags);
2753 free_page(xmit_page);
2758 free_page(xmit_page);
2760 info->xmit.buf = (unsigned char *) xmit_page;
2762 #ifdef SERIAL_DEBUG_OPEN
2763 printk("starting up ttyS%d (xmit_buf 0x%p)...\n", info->line, info->xmit.buf);
2766 #ifdef CONFIG_SVINTO_SIM
2767 /* Bits and pieces collected from below. Better to have them
2768 in one ifdef:ed clause than to mix in a lot of ifdefs,
2771 clear_bit(TTY_IO_ERROR, &info->port.tty->flags);
2773 info->xmit.head = info->xmit.tail = 0;
2774 info->first_recv_buffer = info->last_recv_buffer = NULL;
2775 info->recv_cnt = info->max_recv_cnt = 0;
2777 for (i = 0; i < SERIAL_RECV_DESCRIPTORS; i++)
2778 info->rec_descr[i].buf = NULL;
2780 /* No real action in the simulator, but may set info important
2786 * Clear the FIFO buffers and disable them
2787 * (they will be reenabled in change_speed())
2791 * Reset the DMA channels and make sure their interrupts are cleared
2794 if (info->dma_in_enabled) {
2795 info->uses_dma_in = 1;
2796 e100_enable_rxdma_channel(info);
2798 *info->icmdadr = IO_STATE(R_DMA_CH6_CMD, cmd, reset);
2800 /* Wait until reset cycle is complete */
2801 while (IO_EXTRACT(R_DMA_CH6_CMD, cmd, *info->icmdadr) ==
2802 IO_STATE_VALUE(R_DMA_CH6_CMD, cmd, reset));
2804 /* Make sure the irqs are cleared */
2805 *info->iclrintradr =
2806 IO_STATE(R_DMA_CH6_CLR_INTR, clr_descr, do) |
2807 IO_STATE(R_DMA_CH6_CLR_INTR, clr_eop, do);
2809 e100_disable_rxdma_channel(info);
2812 if (info->dma_out_enabled) {
2813 info->uses_dma_out = 1;
2814 e100_enable_txdma_channel(info);
2815 *info->ocmdadr = IO_STATE(R_DMA_CH6_CMD, cmd, reset);
2817 while (IO_EXTRACT(R_DMA_CH6_CMD, cmd, *info->ocmdadr) ==
2818 IO_STATE_VALUE(R_DMA_CH6_CMD, cmd, reset));
2820 /* Make sure the irqs are cleared */
2821 *info->oclrintradr =
2822 IO_STATE(R_DMA_CH6_CLR_INTR, clr_descr, do) |
2823 IO_STATE(R_DMA_CH6_CLR_INTR, clr_eop, do);
2825 e100_disable_txdma_channel(info);
2829 clear_bit(TTY_IO_ERROR, &info->port.tty->flags);
2831 info->xmit.head = info->xmit.tail = 0;
2832 info->first_recv_buffer = info->last_recv_buffer = NULL;
2833 info->recv_cnt = info->max_recv_cnt = 0;
2835 for (i = 0; i < SERIAL_RECV_DESCRIPTORS; i++)
2836 info->rec_descr[i].buf = 0;
2839 * and set the speed and other flags of the serial port
2840 * this will start the rx/tx as well
2842 #ifdef SERIAL_HANDLE_EARLY_ERRORS
2843 e100_enable_serial_data_irq(info);
2847 /* dummy read to reset any serial errors */
2849 (void)info->ioport[REG_DATA];
2851 /* enable the interrupts */
2852 if (info->uses_dma_out)
2853 e100_enable_txdma_irq(info);
2855 e100_enable_rx_irq(info);
2857 info->tr_running = 0; /* to be sure we don't lock up the transmitter */
2859 /* setup the dma input descriptor and start dma */
2861 start_receive(info);
2863 /* for safety, make sure the descriptors last result is 0 bytes written */
2865 info->tr_descr.sw_len = 0;
2866 info->tr_descr.hw_len = 0;
2867 info->tr_descr.status = 0;
2869 /* enable RTS/DTR last */
2874 #endif /* CONFIG_SVINTO_SIM */
2876 info->flags |= ASYNC_INITIALIZED;
2878 local_irq_restore(flags);
2883 * This routine will shutdown a serial port; interrupts are disabled, and
2884 * DTR is dropped if the hangup on close termio flag is on.
2887 shutdown(struct e100_serial * info)
2889 unsigned long flags;
2890 struct etrax_dma_descr *descr = info->rec_descr;
2891 struct etrax_recv_buffer *buffer;
2894 #ifndef CONFIG_SVINTO_SIM
2895 /* shut down the transmitter and receiver */
2896 DFLOW(DEBUG_LOG(info->line, "shutdown %i\n", info->line));
2897 e100_disable_rx(info);
2898 info->ioport[REG_TR_CTRL] = (info->tx_ctrl &= ~0x40);
2900 /* disable interrupts, reset dma channels */
2901 if (info->uses_dma_in) {
2902 e100_disable_rxdma_irq(info);
2903 *info->icmdadr = IO_STATE(R_DMA_CH6_CMD, cmd, reset);
2904 info->uses_dma_in = 0;
2906 e100_disable_serial_data_irq(info);
2909 if (info->uses_dma_out) {
2910 e100_disable_txdma_irq(info);
2911 info->tr_running = 0;
2912 *info->ocmdadr = IO_STATE(R_DMA_CH6_CMD, cmd, reset);
2913 info->uses_dma_out = 0;
2915 e100_disable_serial_tx_ready_irq(info);
2916 info->tr_running = 0;
2919 #endif /* CONFIG_SVINTO_SIM */
2921 if (!(info->flags & ASYNC_INITIALIZED))
2924 #ifdef SERIAL_DEBUG_OPEN
2925 printk("Shutting down serial port %d (irq %d)....\n", info->line,
2929 local_irq_save(flags);
2931 if (info->xmit.buf) {
2932 free_page((unsigned long)info->xmit.buf);
2933 info->xmit.buf = NULL;
2936 for (i = 0; i < SERIAL_RECV_DESCRIPTORS; i++)
2938 buffer = phys_to_virt(descr[i].buf) - sizeof *buffer;
2943 if (!info->port.tty || (info->port.tty->termios->c_cflag & HUPCL)) {
2944 /* hang up DTR and RTS if HUPCL is enabled */
2946 e100_rts(info, 0); /* could check CRTSCTS before doing this */
2950 set_bit(TTY_IO_ERROR, &info->port.tty->flags);
2952 info->flags &= ~ASYNC_INITIALIZED;
2953 local_irq_restore(flags);
2957 /* change baud rate and other assorted parameters */
2960 change_speed(struct e100_serial *info)
2964 unsigned long flags;
2965 /* first some safety checks */
2967 if (!info->port.tty || !info->port.tty->termios)
2972 cflag = info->port.tty->termios->c_cflag;
2974 /* possibly, the tx/rx should be disabled first to do this safely */
2976 /* change baud-rate and write it to the hardware */
2977 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST) {
2978 /* Special baudrate */
2979 u32 mask = 0xFF << (info->line*8); /* Each port has 8 bits */
2980 unsigned long alt_source =
2981 IO_STATE(R_ALT_SER_BAUDRATE, ser0_rec, normal) |
2982 IO_STATE(R_ALT_SER_BAUDRATE, ser0_tr, normal);
2983 /* R_ALT_SER_BAUDRATE selects the source */
2984 DBAUD(printk("Custom baudrate: baud_base/divisor %lu/%i\n",
2985 (unsigned long)info->baud_base, info->custom_divisor));
2986 if (info->baud_base == SERIAL_PRESCALE_BASE) {
2987 /* 0, 2-65535 (0=65536) */
2988 u16 divisor = info->custom_divisor;
2989 /* R_SERIAL_PRESCALE (upper 16 bits of R_CLOCK_PRESCALE) */
2990 /* baudrate is 3.125MHz/custom_divisor */
2992 IO_STATE(R_ALT_SER_BAUDRATE, ser0_rec, prescale) |
2993 IO_STATE(R_ALT_SER_BAUDRATE, ser0_tr, prescale);
2995 DBAUD(printk("Writing SERIAL_PRESCALE: divisor %i\n", divisor));
2996 *R_SERIAL_PRESCALE = divisor;
2997 info->baud = SERIAL_PRESCALE_BASE/divisor;
2999 #ifdef CONFIG_ETRAX_EXTERN_PB6CLK_ENABLED
3000 else if ((info->baud_base==CONFIG_ETRAX_EXTERN_PB6CLK_FREQ/8 &&
3001 info->custom_divisor == 1) ||
3002 (info->baud_base==CONFIG_ETRAX_EXTERN_PB6CLK_FREQ &&
3003 info->custom_divisor == 8)) {
3004 /* ext_clk selected */
3006 IO_STATE(R_ALT_SER_BAUDRATE, ser0_rec, extern) |
3007 IO_STATE(R_ALT_SER_BAUDRATE, ser0_tr, extern);
3008 DBAUD(printk("using external baudrate: %lu\n", CONFIG_ETRAX_EXTERN_PB6CLK_FREQ/8));
3009 info->baud = CONFIG_ETRAX_EXTERN_PB6CLK_FREQ/8;
3014 /* Bad baudbase, we don't support using timer0
3017 printk(KERN_WARNING "Bad baud_base/custom_divisor: %lu/%i\n",
3018 (unsigned long)info->baud_base, info->custom_divisor);
3020 r_alt_ser_baudrate_shadow &= ~mask;
3021 r_alt_ser_baudrate_shadow |= (alt_source << (info->line*8));
3022 *R_ALT_SER_BAUDRATE = r_alt_ser_baudrate_shadow;
3024 /* Normal baudrate */
3025 /* Make sure we use normal baudrate */
3026 u32 mask = 0xFF << (info->line*8); /* Each port has 8 bits */
3027 unsigned long alt_source =
3028 IO_STATE(R_ALT_SER_BAUDRATE, ser0_rec, normal) |
3029 IO_STATE(R_ALT_SER_BAUDRATE, ser0_tr, normal);
3030 r_alt_ser_baudrate_shadow &= ~mask;
3031 r_alt_ser_baudrate_shadow |= (alt_source << (info->line*8));
3032 #ifndef CONFIG_SVINTO_SIM
3033 *R_ALT_SER_BAUDRATE = r_alt_ser_baudrate_shadow;
3034 #endif /* CONFIG_SVINTO_SIM */
3036 info->baud = cflag_to_baud(cflag);
3037 #ifndef CONFIG_SVINTO_SIM
3038 info->ioport[REG_BAUD] = cflag_to_etrax_baud(cflag);
3039 #endif /* CONFIG_SVINTO_SIM */
3042 #ifndef CONFIG_SVINTO_SIM
3043 /* start with default settings and then fill in changes */
3044 local_irq_save(flags);
3045 /* 8 bit, no/even parity */
3046 info->rx_ctrl &= ~(IO_MASK(R_SERIAL0_REC_CTRL, rec_bitnr) |
3047 IO_MASK(R_SERIAL0_REC_CTRL, rec_par_en) |
3048 IO_MASK(R_SERIAL0_REC_CTRL, rec_par));
3050 /* 8 bit, no/even parity, 1 stop bit, no cts */
3051 info->tx_ctrl &= ~(IO_MASK(R_SERIAL0_TR_CTRL, tr_bitnr) |
3052 IO_MASK(R_SERIAL0_TR_CTRL, tr_par_en) |
3053 IO_MASK(R_SERIAL0_TR_CTRL, tr_par) |
3054 IO_MASK(R_SERIAL0_TR_CTRL, stop_bits) |
3055 IO_MASK(R_SERIAL0_TR_CTRL, auto_cts));
3057 if ((cflag & CSIZE) == CS7) {
3058 /* set 7 bit mode */
3059 info->tx_ctrl |= IO_STATE(R_SERIAL0_TR_CTRL, tr_bitnr, tr_7bit);
3060 info->rx_ctrl |= IO_STATE(R_SERIAL0_REC_CTRL, rec_bitnr, rec_7bit);
3063 if (cflag & CSTOPB) {
3064 /* set 2 stop bit mode */
3065 info->tx_ctrl |= IO_STATE(R_SERIAL0_TR_CTRL, stop_bits, two_bits);
3068 if (cflag & PARENB) {
3070 info->tx_ctrl |= IO_STATE(R_SERIAL0_TR_CTRL, tr_par_en, enable);
3071 info->rx_ctrl |= IO_STATE(R_SERIAL0_REC_CTRL, rec_par_en, enable);
3074 if (cflag & CMSPAR) {
3075 /* enable stick parity, PARODD mean Mark which matches ETRAX */
3076 info->tx_ctrl |= IO_STATE(R_SERIAL0_TR_CTRL, tr_stick_par, stick);
3077 info->rx_ctrl |= IO_STATE(R_SERIAL0_REC_CTRL, rec_stick_par, stick);
3079 if (cflag & PARODD) {
3080 /* set odd parity (or Mark if CMSPAR) */
3081 info->tx_ctrl |= IO_STATE(R_SERIAL0_TR_CTRL, tr_par, odd);
3082 info->rx_ctrl |= IO_STATE(R_SERIAL0_REC_CTRL, rec_par, odd);
3085 if (cflag & CRTSCTS) {
3086 /* enable automatic CTS handling */
3087 DFLOW(DEBUG_LOG(info->line, "FLOW auto_cts enabled\n", 0));
3088 info->tx_ctrl |= IO_STATE(R_SERIAL0_TR_CTRL, auto_cts, active);
3091 /* make sure the tx and rx are enabled */
3093 info->tx_ctrl |= IO_STATE(R_SERIAL0_TR_CTRL, tr_enable, enable);
3094 info->rx_ctrl |= IO_STATE(R_SERIAL0_REC_CTRL, rec_enable, enable);
3096 /* actually write the control regs to the hardware */
3098 info->ioport[REG_TR_CTRL] = info->tx_ctrl;
3099 info->ioport[REG_REC_CTRL] = info->rx_ctrl;
3100 xoff = IO_FIELD(R_SERIAL0_XOFF, xoff_char, STOP_CHAR(info->port.tty));
3101 xoff |= IO_STATE(R_SERIAL0_XOFF, tx_stop, enable);
3102 if (info->port.tty->termios->c_iflag & IXON ) {
3103 DFLOW(DEBUG_LOG(info->line, "FLOW XOFF enabled 0x%02X\n",
3104 STOP_CHAR(info->port.tty)));
3105 xoff |= IO_STATE(R_SERIAL0_XOFF, auto_xoff, enable);
3108 *((unsigned long *)&info->ioport[REG_XOFF]) = xoff;
3109 local_irq_restore(flags);
3110 #endif /* !CONFIG_SVINTO_SIM */
3112 update_char_time(info);
3114 } /* change_speed */
3116 /* start transmitting chars NOW */
3119 rs_flush_chars(struct tty_struct *tty)
3121 struct e100_serial *info = (struct e100_serial *)tty->driver_data;
3122 unsigned long flags;
3124 if (info->tr_running ||
3125 info->xmit.head == info->xmit.tail ||
3131 #ifdef SERIAL_DEBUG_FLOW
3132 printk("rs_flush_chars\n");
3135 /* this protection might not exactly be necessary here */
3137 local_irq_save(flags);
3138 start_transmit(info);
3139 local_irq_restore(flags);
3142 static int rs_raw_write(struct tty_struct *tty,
3143 const unsigned char *buf, int count)
3146 struct e100_serial *info = (struct e100_serial *)tty->driver_data;
3147 unsigned long flags;
3149 /* first some sanity checks */
3151 if (!tty || !info->xmit.buf || !tmp_buf)
3154 #ifdef SERIAL_DEBUG_DATA
3155 if (info->line == SERIAL_DEBUG_LINE)
3156 printk("rs_raw_write (%d), status %d\n",
3157 count, info->ioport[REG_STATUS]);
3160 #ifdef CONFIG_SVINTO_SIM
3161 /* Really simple. The output is here and now. */
3162 SIMCOUT(buf, count);
3165 local_save_flags(flags);
3166 DFLOW(DEBUG_LOG(info->line, "write count %i ", count));
3167 DFLOW(DEBUG_LOG(info->line, "ldisc %i\n", tty->ldisc.chars_in_buffer(tty)));
3170 /* The local_irq_disable/restore_flags pairs below are needed
3171 * because the DMA interrupt handler moves the info->xmit values.
3172 * the memcpy needs to be in the critical region unfortunately,
3173 * because we need to read xmit values, memcpy, write xmit values
3174 * in one atomic operation... this could perhaps be avoided by
3175 * more clever design.
3177 local_irq_disable();
3179 c = CIRC_SPACE_TO_END(info->xmit.head,
3188 memcpy(info->xmit.buf + info->xmit.head, buf, c);
3189 info->xmit.head = (info->xmit.head + c) &
3190 (SERIAL_XMIT_SIZE-1);
3195 local_irq_restore(flags);
3197 /* enable transmitter if not running, unless the tty is stopped
3198 * this does not need IRQ protection since if tr_running == 0
3199 * the IRQ's are not running anyway for this port.
3201 DFLOW(DEBUG_LOG(info->line, "write ret %i\n", ret));
3203 if (info->xmit.head != info->xmit.tail &&
3206 !info->tr_running) {
3207 start_transmit(info);
3211 } /* raw_raw_write() */
3214 rs_write(struct tty_struct *tty,
3215 const unsigned char *buf, int count)
3217 #if defined(CONFIG_ETRAX_RS485)
3218 struct e100_serial *info = (struct e100_serial *)tty->driver_data;
3220 if (info->rs485.flags & SER_RS485_ENABLED)
3222 /* If we are in RS-485 mode, we need to toggle RTS and disable
3223 * the receiver before initiating a DMA transfer
3225 #ifdef CONFIG_ETRAX_FAST_TIMER
3226 /* Abort any started timer */
3227 fast_timers_rs485[info->line].function = NULL;
3228 del_fast_timer(&fast_timers_rs485[info->line]);
3230 e100_rts(info, (info->rs485.flags & SER_RS485_RTS_ON_SEND));
3231 #if defined(CONFIG_ETRAX_RS485_DISABLE_RECEIVER)
3232 e100_disable_rx(info);
3233 e100_enable_rx_irq(info);
3236 if (info->rs485.delay_rts_before_send > 0)
3237 msleep(info->rs485.delay_rts_before_send);
3239 #endif /* CONFIG_ETRAX_RS485 */
3241 count = rs_raw_write(tty, buf, count);
3243 #if defined(CONFIG_ETRAX_RS485)
3244 if (info->rs485.flags & SER_RS485_ENABLED)
3247 /* If we are in RS-485 mode the following has to be done:
3248 * wait until DMA is ready
3249 * wait on transmit shift register
3251 * enable the receiver
3254 /* Sleep until all sent */
3255 tty_wait_until_sent(tty, 0);
3256 #ifdef CONFIG_ETRAX_FAST_TIMER
3257 /* Now sleep a little more so that shift register is empty */
3258 schedule_usleep(info->char_time_usec * 2);
3260 /* wait on transmit shift register */
3262 get_lsr_info(info, &val);
3263 }while (!(val & TIOCSER_TEMT));
3265 e100_rts(info, (info->rs485.flags & SER_RS485_RTS_AFTER_SEND));
3267 #if defined(CONFIG_ETRAX_RS485_DISABLE_RECEIVER)
3268 e100_enable_rx(info);
3269 e100_enable_rxdma_irq(info);
3272 #endif /* CONFIG_ETRAX_RS485 */
3278 /* how much space is available in the xmit buffer? */
3281 rs_write_room(struct tty_struct *tty)
3283 struct e100_serial *info = (struct e100_serial *)tty->driver_data;
3285 return CIRC_SPACE(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
3288 /* How many chars are in the xmit buffer?
3289 * This does not include any chars in the transmitter FIFO.
3290 * Use wait_until_sent for waiting for FIFO drain.
3294 rs_chars_in_buffer(struct tty_struct *tty)
3296 struct e100_serial *info = (struct e100_serial *)tty->driver_data;
3298 return CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
3301 /* discard everything in the xmit buffer */
3304 rs_flush_buffer(struct tty_struct *tty)
3306 struct e100_serial *info = (struct e100_serial *)tty->driver_data;
3307 unsigned long flags;
3309 local_irq_save(flags);
3310 info->xmit.head = info->xmit.tail = 0;
3311 local_irq_restore(flags);
3317 * This function is used to send a high-priority XON/XOFF character to
3320 * Since we use DMA we don't check for info->x_char in transmit_chars_dma(),
3321 * but we do it in handle_ser_tx_interrupt().
3322 * We disable DMA channel and enable tx ready interrupt and write the
3323 * character when possible.
3325 static void rs_send_xchar(struct tty_struct *tty, char ch)
3327 struct e100_serial *info = (struct e100_serial *)tty->driver_data;
3328 unsigned long flags;
3329 local_irq_save(flags);
3330 if (info->uses_dma_out) {
3331 /* Put the DMA on hold and disable the channel */
3332 *info->ocmdadr = IO_STATE(R_DMA_CH6_CMD, cmd, hold);
3333 while (IO_EXTRACT(R_DMA_CH6_CMD, cmd, *info->ocmdadr) !=
3334 IO_STATE_VALUE(R_DMA_CH6_CMD, cmd, hold));
3335 e100_disable_txdma_channel(info);
3338 /* Must make sure transmitter is not stopped before we can transmit */
3342 /* Enable manual transmit interrupt and send from there */
3343 DFLOW(DEBUG_LOG(info->line, "rs_send_xchar 0x%02X\n", ch));
3345 e100_enable_serial_tx_ready_irq(info);
3346 local_irq_restore(flags);
3350 * ------------------------------------------------------------
3353 * This routine is called by the upper-layer tty layer to signal that
3354 * incoming characters should be throttled.
3355 * ------------------------------------------------------------
3358 rs_throttle(struct tty_struct * tty)
3360 struct e100_serial *info = (struct e100_serial *)tty->driver_data;
3361 #ifdef SERIAL_DEBUG_THROTTLE
3364 printk("throttle %s: %lu....\n", tty_name(tty, buf),
3365 (unsigned long)tty->ldisc.chars_in_buffer(tty));
3367 DFLOW(DEBUG_LOG(info->line,"rs_throttle %lu\n", tty->ldisc.chars_in_buffer(tty)));
3369 /* Do RTS before XOFF since XOFF might take some time */
3370 if (tty->termios->c_cflag & CRTSCTS) {
3371 /* Turn off RTS line */
3375 rs_send_xchar(tty, STOP_CHAR(tty));
3380 rs_unthrottle(struct tty_struct * tty)
3382 struct e100_serial *info = (struct e100_serial *)tty->driver_data;
3383 #ifdef SERIAL_DEBUG_THROTTLE
3386 printk("unthrottle %s: %lu....\n", tty_name(tty, buf),
3387 (unsigned long)tty->ldisc.chars_in_buffer(tty));
3389 DFLOW(DEBUG_LOG(info->line,"rs_unthrottle ldisc %d\n", tty->ldisc.chars_in_buffer(tty)));
3390 DFLOW(DEBUG_LOG(info->line,"rs_unthrottle flip.count: %i\n", tty->flip.count));
3391 /* Do RTS before XOFF since XOFF might take some time */
3392 if (tty->termios->c_cflag & CRTSCTS) {
3393 /* Assert RTS line */
3401 rs_send_xchar(tty, START_CHAR(tty));
3407 * ------------------------------------------------------------
3408 * rs_ioctl() and friends
3409 * ------------------------------------------------------------
3413 get_serial_info(struct e100_serial * info,
3414 struct serial_struct * retinfo)
3416 struct serial_struct tmp;
3418 /* this is all probably wrong, there are a lot of fields
3419 * here that we don't have in e100_serial and maybe we
3420 * should set them to something else than 0.
3425 memset(&tmp, 0, sizeof(tmp));
3426 tmp.type = info->type;
3427 tmp.line = info->line;
3428 tmp.port = (int)info->ioport;
3429 tmp.irq = info->irq;
3430 tmp.flags = info->flags;
3431 tmp.baud_base = info->baud_base;
3432 tmp.close_delay = info->close_delay;
3433 tmp.closing_wait = info->closing_wait;
3434 tmp.custom_divisor = info->custom_divisor;
3435 if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
3441 set_serial_info(struct e100_serial *info,
3442 struct serial_struct *new_info)
3444 struct serial_struct new_serial;
3445 struct e100_serial old_info;
3448 if (copy_from_user(&new_serial, new_info, sizeof(new_serial)))
3453 if (!capable(CAP_SYS_ADMIN)) {
3454 if ((new_serial.type != info->type) ||
3455 (new_serial.close_delay != info->close_delay) ||
3456 ((new_serial.flags & ~ASYNC_USR_MASK) !=
3457 (info->flags & ~ASYNC_USR_MASK)))
3459 info->flags = ((info->flags & ~ASYNC_USR_MASK) |
3460 (new_serial.flags & ASYNC_USR_MASK));
3461 goto check_and_exit;
3464 if (info->count > 1)
3468 * OK, past this point, all the error checking has been done.
3469 * At this point, we start making changes.....
3472 info->baud_base = new_serial.baud_base;
3473 info->flags = ((info->flags & ~ASYNC_FLAGS) |
3474 (new_serial.flags & ASYNC_FLAGS));
3475 info->custom_divisor = new_serial.custom_divisor;
3476 info->type = new_serial.type;
3477 info->close_delay = new_serial.close_delay;
3478 info->closing_wait = new_serial.closing_wait;
3479 info->port.tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
3482 if (info->flags & ASYNC_INITIALIZED) {
3485 retval = startup(info);
3490 * get_lsr_info - get line status register info
3492 * Purpose: Let user call ioctl() to get info when the UART physically
3493 * is emptied. On bus types like RS485, the transmitter must
3494 * release the bus after transmitting. This must be done when
3495 * the transmit shift register is empty, not be done when the
3496 * transmit holding register is empty. This functionality
3497 * allows an RS485 driver to be written in user space.
3500 get_lsr_info(struct e100_serial * info, unsigned int *value)
3502 unsigned int result = TIOCSER_TEMT;
3503 #ifndef CONFIG_SVINTO_SIM
3504 unsigned long curr_time = jiffies;
3505 unsigned long curr_time_usec = GET_JIFFIES_USEC();
3506 unsigned long elapsed_usec =
3507 (curr_time - info->last_tx_active) * 1000000/HZ +
3508 curr_time_usec - info->last_tx_active_usec;
3510 if (info->xmit.head != info->xmit.tail ||
3511 elapsed_usec < 2*info->char_time_usec) {
3516 if (copy_to_user(value, &result, sizeof(int)))
3521 #ifdef SERIAL_DEBUG_IO
3528 const struct state_str control_state_str[] = {
3529 {TIOCM_DTR, "DTR" },
3533 {TIOCM_CTS, "CTS" },
3536 {TIOCM_DSR, "DSR" },
3540 char *get_control_state_str(int MLines, char *s)
3545 while (control_state_str[i].str != NULL) {
3546 if (MLines & control_state_str[i].state) {
3550 strcat(s, control_state_str[i].str);
3559 rs_break(struct tty_struct *tty, int break_state)
3561 struct e100_serial *info = (struct e100_serial *)tty->driver_data;
3562 unsigned long flags;
3567 local_irq_save(flags);
3568 if (break_state == -1) {
3569 /* Go to manual mode and set the txd pin to 0 */
3570 /* Clear bit 7 (txd) and 6 (tr_enable) */
3571 info->tx_ctrl &= 0x3F;
3573 /* Set bit 7 (txd) and 6 (tr_enable) */
3574 info->tx_ctrl |= (0x80 | 0x40);
3576 info->ioport[REG_TR_CTRL] = info->tx_ctrl;
3577 local_irq_restore(flags);
3582 rs_tiocmset(struct tty_struct *tty, struct file *file,
3583 unsigned int set, unsigned int clear)
3585 struct e100_serial *info = (struct e100_serial *)tty->driver_data;
3586 unsigned long flags;
3588 local_irq_save(flags);
3590 if (clear & TIOCM_RTS)
3592 if (clear & TIOCM_DTR)
3594 /* Handle FEMALE behaviour */
3595 if (clear & TIOCM_RI)
3596 e100_ri_out(info, 0);
3597 if (clear & TIOCM_CD)
3598 e100_cd_out(info, 0);
3600 if (set & TIOCM_RTS)
3602 if (set & TIOCM_DTR)
3604 /* Handle FEMALE behaviour */
3606 e100_ri_out(info, 1);
3608 e100_cd_out(info, 1);
3610 local_irq_restore(flags);
3615 rs_tiocmget(struct tty_struct *tty, struct file *file)
3617 struct e100_serial *info = (struct e100_serial *)tty->driver_data;
3618 unsigned int result;
3619 unsigned long flags;
3621 local_irq_save(flags);
3624 (!E100_RTS_GET(info) ? TIOCM_RTS : 0)
3625 | (!E100_DTR_GET(info) ? TIOCM_DTR : 0)
3626 | (!E100_RI_GET(info) ? TIOCM_RNG : 0)
3627 | (!E100_DSR_GET(info) ? TIOCM_DSR : 0)
3628 | (!E100_CD_GET(info) ? TIOCM_CAR : 0)
3629 | (!E100_CTS_GET(info) ? TIOCM_CTS : 0);
3631 local_irq_restore(flags);
3633 #ifdef SERIAL_DEBUG_IO
3634 printk(KERN_DEBUG "ser%i: modem state: %i 0x%08X\n",
3635 info->line, result, result);
3639 get_control_state_str(result, s);
3640 printk(KERN_DEBUG "state: %s\n", s);
3649 rs_ioctl(struct tty_struct *tty, struct file * file,
3650 unsigned int cmd, unsigned long arg)
3652 struct e100_serial * info = (struct e100_serial *)tty->driver_data;
3654 if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
3655 (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGWILD) &&
3656 (cmd != TIOCSERSWILD) && (cmd != TIOCSERGSTRUCT)) {
3657 if (tty->flags & (1 << TTY_IO_ERROR))
3663 return get_serial_info(info,
3664 (struct serial_struct *) arg);
3666 return set_serial_info(info,
3667 (struct serial_struct *) arg);
3668 case TIOCSERGETLSR: /* Get line status register */
3669 return get_lsr_info(info, (unsigned int *) arg);
3671 case TIOCSERGSTRUCT:
3672 if (copy_to_user((struct e100_serial *) arg,
3673 info, sizeof(struct e100_serial)))
3677 #if defined(CONFIG_ETRAX_RS485)
3678 case TIOCSERSETRS485:
3680 /* In this ioctl we still use the old structure
3681 * rs485_control for backward compatibility
3682 * (if we use serial_rs485, then old user-level code
3683 * wouldn't work anymore...).
3684 * The use of this ioctl is deprecated: use TIOCSRS485
3686 struct rs485_control rs485ctrl;
3687 struct serial_rs485 rs485data;
3688 printk(KERN_DEBUG "The use of this ioctl is deprecated. Use TIOCSRS485 instead\n");
3689 if (copy_from_user(&rs485ctrl, (struct rs485_control *)arg,
3693 rs485data.delay_rts_before_send = rs485ctrl.delay_rts_before_send;
3694 rs485data.flags = 0;
3695 if (rs485ctrl.enabled)
3696 rs485data.flags |= SER_RS485_ENABLED;
3698 rs485data.flags &= ~(SER_RS485_ENABLED);
3700 if (rs485ctrl.rts_on_send)
3701 rs485data.flags |= SER_RS485_RTS_ON_SEND;
3703 rs485data.flags &= ~(SER_RS485_RTS_ON_SEND);
3705 if (rs485ctrl.rts_after_sent)
3706 rs485data.flags |= SER_RS485_RTS_AFTER_SEND;
3708 rs485data.flags &= ~(SER_RS485_RTS_AFTER_SEND);
3710 return e100_enable_rs485(tty, &rs485data);
3715 /* This is the new version of TIOCSRS485, with new
3716 * data structure serial_rs485 */
3717 struct serial_rs485 rs485data;
3718 if (copy_from_user(&rs485data, (struct rs485_control *)arg,
3722 return e100_enable_rs485(tty, &rs485data);
3726 case TIOCSERWRRS485:
3728 struct rs485_write rs485wr;
3729 if (copy_from_user(&rs485wr, (struct rs485_write *)arg,
3733 return e100_write_rs485(tty, rs485wr.outc, rs485wr.outc_size);
3738 return -ENOIOCTLCMD;
3744 rs_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
3746 struct e100_serial *info = (struct e100_serial *)tty->driver_data;
3750 /* Handle turning off CRTSCTS */
3751 if ((old_termios->c_cflag & CRTSCTS) &&
3752 !(tty->termios->c_cflag & CRTSCTS)) {
3753 tty->hw_stopped = 0;
3760 * ------------------------------------------------------------
3763 * This routine is called when the serial port gets closed. First, we
3764 * wait for the last remaining data to be sent. Then, we unlink its
3765 * S structure from the interrupt chain if necessary, and we free
3766 * that IRQ if nothing is left in the chain.
3767 * ------------------------------------------------------------
3770 rs_close(struct tty_struct *tty, struct file * filp)
3772 struct e100_serial * info = (struct e100_serial *)tty->driver_data;
3773 unsigned long flags;
3778 /* interrupts are disabled for this entire function */
3780 local_irq_save(flags);
3782 if (tty_hung_up_p(filp)) {
3783 local_irq_restore(flags);
3787 #ifdef SERIAL_DEBUG_OPEN
3788 printk("[%d] rs_close ttyS%d, count = %d\n", current->pid,
3789 info->line, info->count);
3791 if ((tty->count == 1) && (info->count != 1)) {
3793 * Uh, oh. tty->count is 1, which means that the tty
3794 * structure will be freed. Info->count should always
3795 * be one in these conditions. If it's greater than
3796 * one, we've got real problems, since it means the
3797 * serial port won't be shutdown.
3800 "rs_close: bad serial port count; tty->count is 1, "
3801 "info->count is %d\n", info->count);
3804 if (--info->count < 0) {
3805 printk(KERN_CRIT "rs_close: bad serial port count for ttyS%d: %d\n",
3806 info->line, info->count);
3810 local_irq_restore(flags);
3813 info->flags |= ASYNC_CLOSING;
3815 * Save the termios structure, since this port may have
3816 * separate termios for callout and dialin.
3818 if (info->flags & ASYNC_NORMAL_ACTIVE)
3819 info->normal_termios = *tty->termios;
3821 * Now we wait for the transmit buffer to clear; and we notify
3822 * the line discipline to only process XON/XOFF characters.
3825 if (info->closing_wait != ASYNC_CLOSING_WAIT_NONE)
3826 tty_wait_until_sent(tty, info->closing_wait);
3828 * At this point we stop accepting input. To do this, we
3829 * disable the serial receiver and the DMA receive interrupt.
3831 #ifdef SERIAL_HANDLE_EARLY_ERRORS
3832 e100_disable_serial_data_irq(info);
3835 #ifndef CONFIG_SVINTO_SIM
3836 e100_disable_rx(info);
3837 e100_disable_rx_irq(info);
3839 if (info->flags & ASYNC_INITIALIZED) {
3841 * Before we drop DTR, make sure the UART transmitter
3842 * has completely drained; this is especially
3843 * important as we have a transmit FIFO!
3845 rs_wait_until_sent(tty, HZ);
3850 rs_flush_buffer(tty);
3851 tty_ldisc_flush(tty);
3854 info->port.tty = NULL;
3855 if (info->blocked_open) {
3856 if (info->close_delay)
3857 schedule_timeout_interruptible(info->close_delay);
3858 wake_up_interruptible(&info->open_wait);
3860 info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
3861 wake_up_interruptible(&info->close_wait);
3862 local_irq_restore(flags);
3866 #if defined(CONFIG_ETRAX_RS485)
3867 if (info->rs485.flags & SER_RS485_ENABLED) {
3868 info->rs485.flags &= ~(SER_RS485_ENABLED);
3869 #if defined(CONFIG_ETRAX_RS485_ON_PA)
3870 *R_PORT_PA_DATA = port_pa_data_shadow &= ~(1 << rs485_pa_bit);
3872 #if defined(CONFIG_ETRAX_RS485_ON_PORT_G)
3873 REG_SHADOW_SET(R_PORT_G_DATA, port_g_data_shadow,
3874 rs485_port_g_bit, 0);
3876 #if defined(CONFIG_ETRAX_RS485_LTC1387)
3877 REG_SHADOW_SET(R_PORT_G_DATA, port_g_data_shadow,
3878 CONFIG_ETRAX_RS485_LTC1387_DXEN_PORT_G_BIT, 0);
3879 REG_SHADOW_SET(R_PORT_G_DATA, port_g_data_shadow,
3880 CONFIG_ETRAX_RS485_LTC1387_RXEN_PORT_G_BIT, 0);
3886 * Release any allocated DMA irq's.
3888 if (info->dma_in_enabled) {
3889 free_irq(info->dma_in_irq_nbr, info);
3890 cris_free_dma(info->dma_in_nbr, info->dma_in_irq_description);
3891 info->uses_dma_in = 0;
3892 #ifdef SERIAL_DEBUG_OPEN
3893 printk(KERN_DEBUG "DMA irq '%s' freed\n",
3894 info->dma_in_irq_description);
3897 if (info->dma_out_enabled) {
3898 free_irq(info->dma_out_irq_nbr, info);
3899 cris_free_dma(info->dma_out_nbr, info->dma_out_irq_description);
3900 info->uses_dma_out = 0;
3901 #ifdef SERIAL_DEBUG_OPEN
3902 printk(KERN_DEBUG "DMA irq '%s' freed\n",
3903 info->dma_out_irq_description);
3909 * rs_wait_until_sent() --- wait until the transmitter is empty
3911 static void rs_wait_until_sent(struct tty_struct *tty, int timeout)
3913 unsigned long orig_jiffies;
3914 struct e100_serial *info = (struct e100_serial *)tty->driver_data;
3915 unsigned long curr_time = jiffies;
3916 unsigned long curr_time_usec = GET_JIFFIES_USEC();
3918 (curr_time - info->last_tx_active) * (1000000/HZ) +
3919 curr_time_usec - info->last_tx_active_usec;
3922 * Check R_DMA_CHx_STATUS bit 0-6=number of available bytes in FIFO
3923 * R_DMA_CHx_HWSW bit 31-16=nbr of bytes left in DMA buffer (0=64k)
3926 orig_jiffies = jiffies;
3927 while (info->xmit.head != info->xmit.tail || /* More in send queue */
3928 (*info->ostatusadr & 0x007f) || /* more in FIFO */
3929 (elapsed_usec < 2*info->char_time_usec)) {
3930 schedule_timeout_interruptible(1);
3931 if (signal_pending(current))
3933 if (timeout && time_after(jiffies, orig_jiffies + timeout))
3935 curr_time = jiffies;
3936 curr_time_usec = GET_JIFFIES_USEC();
3938 (curr_time - info->last_tx_active) * (1000000/HZ) +
3939 curr_time_usec - info->last_tx_active_usec;
3941 set_current_state(TASK_RUNNING);
3946 * rs_hangup() --- called by tty_hangup() when a hangup is signaled.
3949 rs_hangup(struct tty_struct *tty)
3951 struct e100_serial * info = (struct e100_serial *)tty->driver_data;
3953 rs_flush_buffer(tty);
3957 info->flags &= ~ASYNC_NORMAL_ACTIVE;
3958 info->port.tty = NULL;
3959 wake_up_interruptible(&info->open_wait);
3963 * ------------------------------------------------------------
3964 * rs_open() and friends
3965 * ------------------------------------------------------------
3968 block_til_ready(struct tty_struct *tty, struct file * filp,
3969 struct e100_serial *info)
3971 DECLARE_WAITQUEUE(wait, current);
3972 unsigned long flags;
3974 int do_clocal = 0, extra_count = 0;
3977 * If the device is in the middle of being closed, then block
3978 * until it's done, and then try again.
3980 if (tty_hung_up_p(filp) ||
3981 (info->flags & ASYNC_CLOSING)) {
3982 wait_event_interruptible(info->close_wait,
3983 !(info->flags & ASYNC_CLOSING));
3984 #ifdef SERIAL_DO_RESTART
3985 if (info->flags & ASYNC_HUP_NOTIFY)
3988 return -ERESTARTSYS;
3995 * If non-blocking mode is set, or the port is not enabled,
3996 * then make the check up front and then exit.
3998 if ((filp->f_flags & O_NONBLOCK) ||
3999 (tty->flags & (1 << TTY_IO_ERROR))) {
4000 info->flags |= ASYNC_NORMAL_ACTIVE;
4004 if (tty->termios->c_cflag & CLOCAL) {
4009 * Block waiting for the carrier detect and the line to become
4010 * free (i.e., not in use by the callout). While we are in
4011 * this loop, info->count is dropped by one, so that
4012 * rs_close() knows when to free things. We restore it upon
4013 * exit, either normal or abnormal.
4016 add_wait_queue(&info->open_wait, &wait);
4017 #ifdef SERIAL_DEBUG_OPEN
4018 printk("block_til_ready before block: ttyS%d, count = %d\n",
4019 info->line, info->count);
4021 local_irq_save(flags);
4022 if (!tty_hung_up_p(filp)) {
4026 local_irq_restore(flags);
4027 info->blocked_open++;
4029 local_irq_save(flags);
4030 /* assert RTS and DTR */
4033 local_irq_restore(flags);
4034 set_current_state(TASK_INTERRUPTIBLE);
4035 if (tty_hung_up_p(filp) ||
4036 !(info->flags & ASYNC_INITIALIZED)) {
4037 #ifdef SERIAL_DO_RESTART
4038 if (info->flags & ASYNC_HUP_NOTIFY)
4041 retval = -ERESTARTSYS;
4047 if (!(info->flags & ASYNC_CLOSING) && do_clocal)
4048 /* && (do_clocal || DCD_IS_ASSERTED) */
4050 if (signal_pending(current)) {
4051 retval = -ERESTARTSYS;
4054 #ifdef SERIAL_DEBUG_OPEN
4055 printk("block_til_ready blocking: ttyS%d, count = %d\n",
4056 info->line, info->count);
4060 set_current_state(TASK_RUNNING);
4061 remove_wait_queue(&info->open_wait, &wait);
4064 info->blocked_open--;
4065 #ifdef SERIAL_DEBUG_OPEN
4066 printk("block_til_ready after blocking: ttyS%d, count = %d\n",
4067 info->line, info->count);
4071 info->flags |= ASYNC_NORMAL_ACTIVE;
4076 deinit_port(struct e100_serial *info)
4078 if (info->dma_out_enabled) {
4079 cris_free_dma(info->dma_out_nbr, info->dma_out_irq_description);
4080 free_irq(info->dma_out_irq_nbr, info);
4082 if (info->dma_in_enabled) {
4083 cris_free_dma(info->dma_in_nbr, info->dma_in_irq_description);
4084 free_irq(info->dma_in_irq_nbr, info);
4089 * This routine is called whenever a serial port is opened.
4090 * It performs the serial-specific initialization for the tty structure.
4093 rs_open(struct tty_struct *tty, struct file * filp)
4095 struct e100_serial *info;
4098 int allocated_resources = 0;
4100 /* find which port we want to open */
4103 if (line < 0 || line >= NR_PORTS)
4106 /* find the corresponding e100_serial struct in the table */
4107 info = rs_table + line;
4109 /* don't allow the opening of ports that are not enabled in the HW config */
4113 #ifdef SERIAL_DEBUG_OPEN
4114 printk("[%d] rs_open %s, count = %d\n", current->pid, tty->name,
4119 tty->driver_data = info;
4120 info->port.tty = tty;
4122 info->port.tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
4125 page = get_zeroed_page(GFP_KERNEL);
4132 tmp_buf = (unsigned char *) page;
4136 * If the port is in the middle of closing, bail out now
4138 if (tty_hung_up_p(filp) ||
4139 (info->flags & ASYNC_CLOSING)) {
4140 wait_event_interruptible(info->close_wait,
4141 !(info->flags & ASYNC_CLOSING));
4142 #ifdef SERIAL_DO_RESTART
4143 return ((info->flags & ASYNC_HUP_NOTIFY) ?
4144 -EAGAIN : -ERESTARTSYS);
4151 * If DMA is enabled try to allocate the irq's.
4153 if (info->count == 1) {
4154 allocated_resources = 1;
4155 if (info->dma_in_enabled) {
4156 if (request_irq(info->dma_in_irq_nbr,
4158 info->dma_in_irq_flags,
4159 info->dma_in_irq_description,
4161 printk(KERN_WARNING "DMA irq '%s' busy; "
4162 "falling back to non-DMA mode\n",
4163 info->dma_in_irq_description);
4164 /* Make sure we never try to use DMA in */
4165 /* for the port again. */
4166 info->dma_in_enabled = 0;
4167 } else if (cris_request_dma(info->dma_in_nbr,
4168 info->dma_in_irq_description,
4169 DMA_VERBOSE_ON_ERROR,
4171 free_irq(info->dma_in_irq_nbr, info);
4172 printk(KERN_WARNING "DMA '%s' busy; "
4173 "falling back to non-DMA mode\n",
4174 info->dma_in_irq_description);
4175 /* Make sure we never try to use DMA in */
4176 /* for the port again. */
4177 info->dma_in_enabled = 0;
4179 #ifdef SERIAL_DEBUG_OPEN
4181 printk(KERN_DEBUG "DMA irq '%s' allocated\n",
4182 info->dma_in_irq_description);
4185 if (info->dma_out_enabled) {
4186 if (request_irq(info->dma_out_irq_nbr,
4188 info->dma_out_irq_flags,
4189 info->dma_out_irq_description,
4191 printk(KERN_WARNING "DMA irq '%s' busy; "
4192 "falling back to non-DMA mode\n",
4193 info->dma_out_irq_description);
4194 /* Make sure we never try to use DMA out */
4195 /* for the port again. */
4196 info->dma_out_enabled = 0;
4197 } else if (cris_request_dma(info->dma_out_nbr,
4198 info->dma_out_irq_description,
4199 DMA_VERBOSE_ON_ERROR,
4201 free_irq(info->dma_out_irq_nbr, info);
4202 printk(KERN_WARNING "DMA '%s' busy; "
4203 "falling back to non-DMA mode\n",
4204 info->dma_out_irq_description);
4205 /* Make sure we never try to use DMA out */
4206 /* for the port again. */
4207 info->dma_out_enabled = 0;
4209 #ifdef SERIAL_DEBUG_OPEN
4211 printk(KERN_DEBUG "DMA irq '%s' allocated\n",
4212 info->dma_out_irq_description);
4218 * Start up the serial port
4221 retval = startup(info);
4223 if (allocated_resources)
4226 /* FIXME Decrease count info->count here too? */
4231 retval = block_til_ready(tty, filp, info);
4233 #ifdef SERIAL_DEBUG_OPEN
4234 printk("rs_open returning after block_til_ready with %d\n",
4237 if (allocated_resources)
4243 if ((info->count == 1) && (info->flags & ASYNC_SPLIT_TERMIOS)) {
4244 *tty->termios = info->normal_termios;
4248 #ifdef SERIAL_DEBUG_OPEN
4249 printk("rs_open ttyS%d successful...\n", info->line);
4251 DLOG_INT_TRIG( log_int_pos = 0);
4253 DFLIP( if (info->line == SERIAL_DEBUG_LINE) {
4254 info->icount.rx = 0;
4261 * /proc fs routines....
4264 static int line_info(char *buf, struct e100_serial *info)
4270 ret = sprintf(buf, "%d: uart:E100 port:%lX irq:%d",
4271 info->line, (unsigned long)info->ioport, info->irq);
4273 if (!info->ioport || (info->type == PORT_UNKNOWN)) {
4274 ret += sprintf(buf+ret, "\n");
4280 if (!E100_RTS_GET(info))
4281 strcat(stat_buf, "|RTS");
4282 if (!E100_CTS_GET(info))
4283 strcat(stat_buf, "|CTS");
4284 if (!E100_DTR_GET(info))
4285 strcat(stat_buf, "|DTR");
4286 if (!E100_DSR_GET(info))
4287 strcat(stat_buf, "|DSR");
4288 if (!E100_CD_GET(info))
4289 strcat(stat_buf, "|CD");
4290 if (!E100_RI_GET(info))
4291 strcat(stat_buf, "|RI");
4293 ret += sprintf(buf+ret, " baud:%d", info->baud);
4295 ret += sprintf(buf+ret, " tx:%lu rx:%lu",
4296 (unsigned long)info->icount.tx,
4297 (unsigned long)info->icount.rx);
4298 tmp = CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
4300 ret += sprintf(buf+ret, " tx_pend:%lu/%lu",
4302 (unsigned long)SERIAL_XMIT_SIZE);
4305 ret += sprintf(buf+ret, " rx_pend:%lu/%lu",
4306 (unsigned long)info->recv_cnt,
4307 (unsigned long)info->max_recv_cnt);
4310 if (info->port.tty) {
4312 if (info->port.tty->stopped)
4313 ret += sprintf(buf+ret, " stopped:%i",
4314 (int)info->port.tty->stopped);
4315 if (info->port.tty->hw_stopped)
4316 ret += sprintf(buf+ret, " hw_stopped:%i",
4317 (int)info->port.tty->hw_stopped);
4321 unsigned char rstat = info->ioport[REG_STATUS];
4322 if (rstat & IO_MASK(R_SERIAL0_STATUS, xoff_detect) )
4323 ret += sprintf(buf+ret, " xoff_detect:1");
4331 if (info->icount.frame)
4332 ret += sprintf(buf+ret, " fe:%lu",
4333 (unsigned long)info->icount.frame);
4335 if (info->icount.parity)
4336 ret += sprintf(buf+ret, " pe:%lu",
4337 (unsigned long)info->icount.parity);
4339 if (info->icount.brk)
4340 ret += sprintf(buf+ret, " brk:%lu",
4341 (unsigned long)info->icount.brk);
4343 if (info->icount.overrun)
4344 ret += sprintf(buf+ret, " oe:%lu",
4345 (unsigned long)info->icount.overrun);
4348 * Last thing is the RS-232 status lines
4350 ret += sprintf(buf+ret, " %s\n", stat_buf+1);
4354 int rs_read_proc(char *page, char **start, off_t off, int count,
4355 int *eof, void *data)
4360 len += sprintf(page, "serinfo:1.0 driver:%s\n",
4362 for (i = 0; i < NR_PORTS && len < 4000; i++) {
4363 if (!rs_table[i].enabled)
4365 l = line_info(page + len, &rs_table[i]);
4367 if (len+begin > off+count)
4369 if (len+begin < off) {
4374 #ifdef DEBUG_LOG_INCLUDED
4375 for (i = 0; i < debug_log_pos; i++) {
4376 len += sprintf(page + len, "%-4i %lu.%lu ", i, debug_log[i].time, timer_data_to_ns(debug_log[i].timer_data));
4377 len += sprintf(page + len, debug_log[i].string, debug_log[i].value);
4378 if (len+begin > off+count)
4380 if (len+begin < off) {
4385 len += sprintf(page + len, "debug_log %i/%i %li bytes\n",
4386 i, DEBUG_LOG_SIZE, begin+len);
4392 if (off >= len+begin)
4394 *start = page + (off-begin);
4395 return ((count < begin+len-off) ? count : begin+len-off);
4398 /* Finally, routines used to initialize the serial driver. */
4401 show_serial_version(void)
4404 "ETRAX 100LX serial-driver %s, (c) 2000-2004 Axis Communications AB\r\n",
4405 &serial_version[11]); /* "$Revision: x.yy" */
4408 /* rs_init inits the driver at boot (using the module_init chain) */
4410 static const struct tty_operations rs_ops = {
4414 .flush_chars = rs_flush_chars,
4415 .write_room = rs_write_room,
4416 .chars_in_buffer = rs_chars_in_buffer,
4417 .flush_buffer = rs_flush_buffer,
4419 .throttle = rs_throttle,
4420 .unthrottle = rs_unthrottle,
4421 .set_termios = rs_set_termios,
4424 .hangup = rs_hangup,
4425 .break_ctl = rs_break,
4426 .send_xchar = rs_send_xchar,
4427 .wait_until_sent = rs_wait_until_sent,
4428 .read_proc = rs_read_proc,
4429 .tiocmget = rs_tiocmget,
4430 .tiocmset = rs_tiocmset
4437 struct e100_serial *info;
4438 struct tty_driver *driver = alloc_tty_driver(NR_PORTS);
4443 show_serial_version();
4445 /* Setup the timed flush handler system */
4447 #if !defined(CONFIG_ETRAX_SERIAL_FAST_TIMER)
4448 setup_timer(&flush_timer, timed_flush_handler, 0);
4449 mod_timer(&flush_timer, jiffies + 5);
4452 #if defined(CONFIG_ETRAX_RS485)
4453 #if defined(CONFIG_ETRAX_RS485_ON_PA)
4454 if (cris_io_interface_allocate_pins(if_ser0, 'a', rs485_pa_bit,
4456 printk(KERN_CRIT "ETRAX100LX serial: Could not allocate "
4458 put_tty_driver(driver);
4462 #if defined(CONFIG_ETRAX_RS485_ON_PORT_G)
4463 if (cris_io_interface_allocate_pins(if_ser0, 'g', rs485_pa_bit,
4464 rs485_port_g_bit)) {
4465 printk(KERN_CRIT "ETRAX100LX serial: Could not allocate "
4467 put_tty_driver(driver);
4473 /* Initialize the tty_driver structure */
4475 driver->driver_name = "serial";
4476 driver->name = "ttyS";
4477 driver->major = TTY_MAJOR;
4478 driver->minor_start = 64;
4479 driver->type = TTY_DRIVER_TYPE_SERIAL;
4480 driver->subtype = SERIAL_TYPE_NORMAL;
4481 driver->init_termios = tty_std_termios;
4482 driver->init_termios.c_cflag =
4483 B115200 | CS8 | CREAD | HUPCL | CLOCAL; /* is normally B9600 default... */
4484 driver->init_termios.c_ispeed = 115200;
4485 driver->init_termios.c_ospeed = 115200;
4486 driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
4488 tty_set_operations(driver, &rs_ops);
4489 serial_driver = driver;
4490 if (tty_register_driver(driver))
4491 panic("Couldn't register serial driver\n");
4492 /* do some initializing for the separate ports */
4494 for (i = 0, info = rs_table; i < NR_PORTS; i++,info++) {
4495 if (info->enabled) {
4496 if (cris_request_io_interface(info->io_if,
4497 info->io_if_description)) {
4498 printk(KERN_CRIT "ETRAX100LX async serial: "
4499 "Could not allocate IO pins for "
4501 info->io_if_description, i);
4505 info->uses_dma_in = 0;
4506 info->uses_dma_out = 0;
4508 info->port.tty = NULL;
4509 info->type = PORT_ETRAX;
4510 info->tr_running = 0;
4511 info->forced_eop = 0;
4512 info->baud_base = DEF_BAUD_BASE;
4513 info->custom_divisor = 0;
4515 info->close_delay = 5*HZ/10;
4516 info->closing_wait = 30*HZ;
4520 info->blocked_open = 0;
4521 info->normal_termios = driver->init_termios;
4522 init_waitqueue_head(&info->open_wait);
4523 init_waitqueue_head(&info->close_wait);
4524 info->xmit.buf = NULL;
4525 info->xmit.tail = info->xmit.head = 0;
4526 info->first_recv_buffer = info->last_recv_buffer = NULL;
4527 info->recv_cnt = info->max_recv_cnt = 0;
4528 info->last_tx_active_usec = 0;
4529 info->last_tx_active = 0;
4531 #if defined(CONFIG_ETRAX_RS485)
4532 /* Set sane defaults */
4533 info->rs485.flags &= ~(SER_RS485_RTS_ON_SEND);
4534 info->rs485.flags |= SER_RS485_RTS_AFTER_SEND;
4535 info->rs485.delay_rts_before_send = 0;
4536 info->rs485.flags &= ~(SER_RS485_ENABLED);
4538 INIT_WORK(&info->work, do_softint);
4540 if (info->enabled) {
4541 printk(KERN_INFO "%s%d at 0x%x is a builtin UART with DMA\n",
4542 serial_driver->name, info->line, (unsigned int)info->ioport);
4545 #ifdef CONFIG_ETRAX_FAST_TIMER
4546 #ifdef CONFIG_ETRAX_SERIAL_FAST_TIMER
4547 memset(fast_timers, 0, sizeof(fast_timers));
4549 #ifdef CONFIG_ETRAX_RS485
4550 memset(fast_timers_rs485, 0, sizeof(fast_timers_rs485));
4555 #ifndef CONFIG_SVINTO_SIM
4556 #ifndef CONFIG_ETRAX_KGDB
4557 /* Not needed in simulator. May only complicate stuff. */
4558 /* hook the irq's for DMA channel 6 and 7, serial output and input, and some more... */
4560 if (request_irq(SERIAL_IRQ_NBR, ser_interrupt,
4561 IRQF_SHARED | IRQF_DISABLED, "serial ", driver))
4562 panic("%s: Failed to request irq8", __func__);
4565 #endif /* CONFIG_SVINTO_SIM */
4570 /* this makes sure that rs_init is called during kernel boot */
4572 module_init(rs_init);