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 then 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 then 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 rs485_control *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.rts_on_send = 0x01 & r->rts_on_send;
1413 info->rs485.rts_after_sent = 0x01 & r->rts_after_sent;
1414 if (r->delay_rts_before_send >= 1000)
1415 info->rs485.delay_rts_before_send = 1000;
1417 info->rs485.delay_rts_before_send = r->delay_rts_before_send;
1418 info->rs485.enabled = r->enabled;
1419 /* printk("rts: on send = %i, after = %i, enabled = %i",
1420 info->rs485.rts_on_send,
1421 info->rs485.rts_after_sent,
1429 e100_write_rs485(struct tty_struct *tty,
1430 const unsigned char *buf, int count)
1432 struct e100_serial * info = (struct e100_serial *)tty->driver_data;
1433 int old_enabled = info->rs485.enabled;
1435 /* rs485 is always implicitly enabled if we're using the ioctl()
1436 * but it doesn't have to be set in the rs485_control
1437 * (to be backward compatible with old apps)
1438 * So we store, set and restore it.
1440 info->rs485.enabled = 1;
1441 /* rs_write now deals with RS485 if enabled */
1442 count = rs_write(tty, buf, count);
1443 info->rs485.enabled = old_enabled;
1447 #ifdef CONFIG_ETRAX_FAST_TIMER
1448 /* Timer function to toggle RTS when using FAST_TIMER */
1449 static void rs485_toggle_rts_timer_function(unsigned long data)
1451 struct e100_serial *info = (struct e100_serial *)data;
1453 fast_timers_rs485[info->line].function = NULL;
1454 e100_rts(info, info->rs485.rts_after_sent);
1455 #if defined(CONFIG_ETRAX_RS485_DISABLE_RECEIVER)
1456 e100_enable_rx(info);
1457 e100_enable_rx_irq(info);
1461 #endif /* CONFIG_ETRAX_RS485 */
1464 * ------------------------------------------------------------
1465 * rs_stop() and rs_start()
1467 * This routines are called before setting or resetting tty->stopped.
1468 * They enable or disable transmitter using the XOFF registers, as necessary.
1469 * ------------------------------------------------------------
1473 rs_stop(struct tty_struct *tty)
1475 struct e100_serial *info = (struct e100_serial *)tty->driver_data;
1477 unsigned long flags;
1480 local_irq_save(flags);
1481 DFLOW(DEBUG_LOG(info->line, "XOFF rs_stop xmit %i\n",
1482 CIRC_CNT(info->xmit.head,
1483 info->xmit.tail,SERIAL_XMIT_SIZE)));
1485 xoff = IO_FIELD(R_SERIAL0_XOFF, xoff_char,
1486 STOP_CHAR(info->port.tty));
1487 xoff |= IO_STATE(R_SERIAL0_XOFF, tx_stop, stop);
1488 if (tty->termios->c_iflag & IXON ) {
1489 xoff |= IO_STATE(R_SERIAL0_XOFF, auto_xoff, enable);
1492 *((unsigned long *)&info->ioport[REG_XOFF]) = xoff;
1493 local_irq_restore(flags);
1498 rs_start(struct tty_struct *tty)
1500 struct e100_serial *info = (struct e100_serial *)tty->driver_data;
1502 unsigned long flags;
1505 local_irq_save(flags);
1506 DFLOW(DEBUG_LOG(info->line, "XOFF rs_start xmit %i\n",
1507 CIRC_CNT(info->xmit.head,
1508 info->xmit.tail,SERIAL_XMIT_SIZE)));
1509 xoff = IO_FIELD(R_SERIAL0_XOFF, xoff_char, STOP_CHAR(tty));
1510 xoff |= IO_STATE(R_SERIAL0_XOFF, tx_stop, enable);
1511 if (tty->termios->c_iflag & IXON ) {
1512 xoff |= IO_STATE(R_SERIAL0_XOFF, auto_xoff, enable);
1515 *((unsigned long *)&info->ioport[REG_XOFF]) = xoff;
1516 if (!info->uses_dma_out &&
1517 info->xmit.head != info->xmit.tail && info->xmit.buf)
1518 e100_enable_serial_tx_ready_irq(info);
1520 local_irq_restore(flags);
1525 * ----------------------------------------------------------------------
1527 * Here starts the interrupt handling routines. All of the following
1528 * subroutines are declared as inline and are folded into
1529 * rs_interrupt(). They were separated out for readability's sake.
1531 * Note: rs_interrupt() is a "fast" interrupt, which means that it
1532 * runs with interrupts turned off. People who may want to modify
1533 * rs_interrupt() should try to keep the interrupt handler as fast as
1534 * possible. After you are done making modifications, it is not a bad
1537 * gcc -S -DKERNEL -Wall -Wstrict-prototypes -O6 -fomit-frame-pointer serial.c
1539 * and look at the resulting assemble code in serial.s.
1541 * - Ted Ts'o (tytso@mit.edu), 7-Mar-93
1542 * -----------------------------------------------------------------------
1546 * This routine is used by the interrupt handler to schedule
1547 * processing in the software interrupt portion of the driver.
1549 static void rs_sched_event(struct e100_serial *info, int event)
1551 if (info->event & (1 << event))
1553 info->event |= 1 << event;
1554 schedule_work(&info->work);
1557 /* The output DMA channel is free - use it to send as many chars as possible
1559 * We don't pay attention to info->x_char, which means if the TTY wants to
1560 * use XON/XOFF it will set info->x_char but we won't send any X char!
1562 * To implement this, we'd just start a DMA send of 1 byte pointing at a
1563 * buffer containing the X char, and skip updating xmit. We'd also have to
1564 * check if the last sent char was the X char when we enter this function
1565 * the next time, to avoid updating xmit with the sent X value.
1569 transmit_chars_dma(struct e100_serial *info)
1571 unsigned int c, sentl;
1572 struct etrax_dma_descr *descr;
1574 #ifdef CONFIG_SVINTO_SIM
1575 /* This will output too little if tail is not 0 always since
1576 * we don't reloop to send the other part. Anyway this SHOULD be a
1577 * no-op - transmit_chars_dma would never really be called during sim
1578 * since rs_write does not write into the xmit buffer then.
1580 if (info->xmit.tail)
1581 printk("Error in serial.c:transmit_chars-dma(), tail!=0\n");
1582 if (info->xmit.head != info->xmit.tail) {
1583 SIMCOUT(info->xmit.buf + info->xmit.tail,
1584 CIRC_CNT(info->xmit.head,
1587 info->xmit.head = info->xmit.tail; /* move back head */
1588 info->tr_running = 0;
1592 /* acknowledge both dma_descr and dma_eop irq in R_DMA_CHx_CLR_INTR */
1593 *info->oclrintradr =
1594 IO_STATE(R_DMA_CH6_CLR_INTR, clr_descr, do) |
1595 IO_STATE(R_DMA_CH6_CLR_INTR, clr_eop, do);
1597 #ifdef SERIAL_DEBUG_INTR
1598 if (info->line == SERIAL_DEBUG_LINE)
1601 if (!info->tr_running) {
1602 /* weirdo... we shouldn't get here! */
1603 printk(KERN_WARNING "Achtung: transmit_chars_dma with !tr_running\n");
1607 descr = &info->tr_descr;
1609 /* first get the amount of bytes sent during the last DMA transfer,
1610 and update xmit accordingly */
1612 /* if the stop bit was not set, all data has been sent */
1613 if (!(descr->status & d_stop)) {
1614 sentl = descr->sw_len;
1616 /* otherwise we find the amount of data sent here */
1617 sentl = descr->hw_len;
1619 DFLOW(DEBUG_LOG(info->line, "TX %i done\n", sentl));
1622 info->icount.tx += sentl;
1624 /* update xmit buffer */
1625 info->xmit.tail = (info->xmit.tail + sentl) & (SERIAL_XMIT_SIZE - 1);
1627 /* if there is only a few chars left in the buf, wake up the blocked
1629 if (CIRC_CNT(info->xmit.head,
1631 SERIAL_XMIT_SIZE) < WAKEUP_CHARS)
1632 rs_sched_event(info, RS_EVENT_WRITE_WAKEUP);
1634 /* find out the largest amount of consecutive bytes we want to send now */
1636 c = CIRC_CNT_TO_END(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
1638 /* Don't send all in one DMA transfer - divide it so we wake up
1639 * application before all is sent
1642 if (c >= 4*WAKEUP_CHARS)
1646 /* our job here is done, don't schedule any new DMA transfer */
1647 info->tr_running = 0;
1649 #if defined(CONFIG_ETRAX_RS485) && defined(CONFIG_ETRAX_FAST_TIMER)
1650 if (info->rs485.enabled) {
1651 /* Set a short timer to toggle RTS */
1652 start_one_shot_timer(&fast_timers_rs485[info->line],
1653 rs485_toggle_rts_timer_function,
1654 (unsigned long)info,
1655 info->char_time_usec*2,
1662 /* ok we can schedule a dma send of c chars starting at info->xmit.tail */
1663 /* set up the descriptor correctly for output */
1664 DFLOW(DEBUG_LOG(info->line, "TX %i\n", c));
1665 descr->ctrl = d_int | d_eol | d_wait; /* Wait needed for tty_wait_until_sent() */
1667 descr->buf = virt_to_phys(info->xmit.buf + info->xmit.tail);
1670 *info->ofirstadr = virt_to_phys(descr); /* write to R_DMAx_FIRST */
1671 *info->ocmdadr = IO_STATE(R_DMA_CH6_CMD, cmd, start);
1673 /* DMA is now running (hopefully) */
1674 } /* transmit_chars_dma */
1677 start_transmit(struct e100_serial *info)
1680 if (info->line == SERIAL_DEBUG_LINE)
1684 info->tr_descr.sw_len = 0;
1685 info->tr_descr.hw_len = 0;
1686 info->tr_descr.status = 0;
1687 info->tr_running = 1;
1688 if (info->uses_dma_out)
1689 transmit_chars_dma(info);
1691 e100_enable_serial_tx_ready_irq(info);
1692 } /* start_transmit */
1694 #ifdef CONFIG_ETRAX_SERIAL_FAST_TIMER
1695 static int serial_fast_timer_started = 0;
1696 static int serial_fast_timer_expired = 0;
1697 static void flush_timeout_function(unsigned long data);
1698 #define START_FLUSH_FAST_TIMER_TIME(info, string, usec) {\
1699 unsigned long timer_flags; \
1700 local_irq_save(timer_flags); \
1701 if (fast_timers[info->line].function == NULL) { \
1702 serial_fast_timer_started++; \
1703 TIMERD(DEBUG_LOG(info->line, "start_timer %i ", info->line)); \
1704 TIMERD(DEBUG_LOG(info->line, "num started: %i\n", serial_fast_timer_started)); \
1705 start_one_shot_timer(&fast_timers[info->line], \
1706 flush_timeout_function, \
1707 (unsigned long)info, \
1712 TIMERD(DEBUG_LOG(info->line, "timer %i already running\n", info->line)); \
1714 local_irq_restore(timer_flags); \
1716 #define START_FLUSH_FAST_TIMER(info, string) START_FLUSH_FAST_TIMER_TIME(info, string, info->flush_time_usec)
1719 #define START_FLUSH_FAST_TIMER_TIME(info, string, usec)
1720 #define START_FLUSH_FAST_TIMER(info, string)
1723 static struct etrax_recv_buffer *
1724 alloc_recv_buffer(unsigned int size)
1726 struct etrax_recv_buffer *buffer;
1728 if (!(buffer = kmalloc(sizeof *buffer + size, GFP_ATOMIC)))
1731 buffer->next = NULL;
1733 buffer->error = TTY_NORMAL;
1739 append_recv_buffer(struct e100_serial *info, struct etrax_recv_buffer *buffer)
1741 unsigned long flags;
1743 local_irq_save(flags);
1745 if (!info->first_recv_buffer)
1746 info->first_recv_buffer = buffer;
1748 info->last_recv_buffer->next = buffer;
1750 info->last_recv_buffer = buffer;
1752 info->recv_cnt += buffer->length;
1753 if (info->recv_cnt > info->max_recv_cnt)
1754 info->max_recv_cnt = info->recv_cnt;
1756 local_irq_restore(flags);
1760 add_char_and_flag(struct e100_serial *info, unsigned char data, unsigned char flag)
1762 struct etrax_recv_buffer *buffer;
1763 if (info->uses_dma_in) {
1764 if (!(buffer = alloc_recv_buffer(4)))
1768 buffer->error = flag;
1769 buffer->buffer[0] = data;
1771 append_recv_buffer(info, buffer);
1775 struct tty_struct *tty = info->port.tty;
1776 tty_insert_flip_char(tty, data, flag);
1783 static unsigned int handle_descr_data(struct e100_serial *info,
1784 struct etrax_dma_descr *descr,
1787 struct etrax_recv_buffer *buffer = phys_to_virt(descr->buf) - sizeof *buffer;
1789 if (info->recv_cnt + recvl > 65536) {
1791 "%s: Too much pending incoming serial data! Dropping %u bytes.\n", __func__, recvl);
1795 buffer->length = recvl;
1797 if (info->errorcode == ERRCODE_SET_BREAK)
1798 buffer->error = TTY_BREAK;
1799 info->errorcode = 0;
1801 append_recv_buffer(info, buffer);
1803 if (!(buffer = alloc_recv_buffer(SERIAL_DESCR_BUF_SIZE)))
1804 panic("%s: Failed to allocate memory for receive buffer!\n", __func__);
1806 descr->buf = virt_to_phys(buffer->buffer);
1811 static unsigned int handle_all_descr_data(struct e100_serial *info)
1813 struct etrax_dma_descr *descr;
1815 unsigned int ret = 0;
1819 descr = &info->rec_descr[info->cur_rec_descr];
1821 if (descr == phys_to_virt(*info->idescradr))
1824 if (++info->cur_rec_descr == SERIAL_RECV_DESCRIPTORS)
1825 info->cur_rec_descr = 0;
1827 /* find out how many bytes were read */
1829 /* if the eop bit was not set, all data has been received */
1830 if (!(descr->status & d_eop)) {
1831 recvl = descr->sw_len;
1833 /* otherwise we find the amount of data received here */
1834 recvl = descr->hw_len;
1837 /* Reset the status information */
1840 DFLOW( DEBUG_LOG(info->line, "RX %lu\n", recvl);
1841 if (info->port.tty->stopped) {
1842 unsigned char *buf = phys_to_virt(descr->buf);
1843 DEBUG_LOG(info->line, "rx 0x%02X\n", buf[0]);
1844 DEBUG_LOG(info->line, "rx 0x%02X\n", buf[1]);
1845 DEBUG_LOG(info->line, "rx 0x%02X\n", buf[2]);
1850 info->icount.rx += recvl;
1852 ret += handle_descr_data(info, descr, recvl);
1858 static void receive_chars_dma(struct e100_serial *info)
1860 struct tty_struct *tty;
1861 unsigned char rstat;
1863 #ifdef CONFIG_SVINTO_SIM
1864 /* No receive in the simulator. Will probably be when the rest of
1865 * the serial interface works, and this piece will just be removed.
1870 /* Acknowledge both dma_descr and dma_eop irq in R_DMA_CHx_CLR_INTR */
1871 *info->iclrintradr =
1872 IO_STATE(R_DMA_CH6_CLR_INTR, clr_descr, do) |
1873 IO_STATE(R_DMA_CH6_CLR_INTR, clr_eop, do);
1875 tty = info->port.tty;
1876 if (!tty) /* Something wrong... */
1879 #ifdef SERIAL_HANDLE_EARLY_ERRORS
1880 if (info->uses_dma_in)
1881 e100_enable_serial_data_irq(info);
1884 if (info->errorcode == ERRCODE_INSERT_BREAK)
1885 add_char_and_flag(info, '\0', TTY_BREAK);
1887 handle_all_descr_data(info);
1889 /* Read the status register to detect errors */
1890 rstat = info->ioport[REG_STATUS];
1891 if (rstat & IO_MASK(R_SERIAL0_STATUS, xoff_detect) ) {
1892 DFLOW(DEBUG_LOG(info->line, "XOFF detect stat %x\n", rstat));
1895 if (rstat & SER_ERROR_MASK) {
1896 /* If we got an error, we must reset it by reading the
1899 unsigned char data = info->ioport[REG_DATA];
1901 PROCSTAT(ser_stat[info->line].errors_cnt++);
1902 DEBUG_LOG(info->line, "#dERR: s d 0x%04X\n",
1903 ((rstat & SER_ERROR_MASK) << 8) | data);
1905 if (rstat & SER_PAR_ERR_MASK)
1906 add_char_and_flag(info, data, TTY_PARITY);
1907 else if (rstat & SER_OVERRUN_MASK)
1908 add_char_and_flag(info, data, TTY_OVERRUN);
1909 else if (rstat & SER_FRAMING_ERR_MASK)
1910 add_char_and_flag(info, data, TTY_FRAME);
1913 START_FLUSH_FAST_TIMER(info, "receive_chars");
1915 /* Restart the receiving DMA */
1916 *info->icmdadr = IO_STATE(R_DMA_CH6_CMD, cmd, restart);
1919 static int start_recv_dma(struct e100_serial *info)
1921 struct etrax_dma_descr *descr = info->rec_descr;
1922 struct etrax_recv_buffer *buffer;
1925 /* Set up the receiving descriptors */
1926 for (i = 0; i < SERIAL_RECV_DESCRIPTORS; i++) {
1927 if (!(buffer = alloc_recv_buffer(SERIAL_DESCR_BUF_SIZE)))
1928 panic("%s: Failed to allocate memory for receive buffer!\n", __func__);
1930 descr[i].ctrl = d_int;
1931 descr[i].buf = virt_to_phys(buffer->buffer);
1932 descr[i].sw_len = SERIAL_DESCR_BUF_SIZE;
1933 descr[i].hw_len = 0;
1934 descr[i].status = 0;
1935 descr[i].next = virt_to_phys(&descr[i+1]);
1938 /* Link the last descriptor to the first */
1939 descr[i-1].next = virt_to_phys(&descr[0]);
1941 /* Start with the first descriptor in the list */
1942 info->cur_rec_descr = 0;
1945 *info->ifirstadr = virt_to_phys(&descr[info->cur_rec_descr]);
1946 *info->icmdadr = IO_STATE(R_DMA_CH6_CMD, cmd, start);
1948 /* Input DMA should be running now */
1953 start_receive(struct e100_serial *info)
1955 #ifdef CONFIG_SVINTO_SIM
1956 /* No receive in the simulator. Will probably be when the rest of
1957 * the serial interface works, and this piece will just be removed.
1961 if (info->uses_dma_in) {
1962 /* reset the input dma channel to be sure it works */
1964 *info->icmdadr = IO_STATE(R_DMA_CH6_CMD, cmd, reset);
1965 while (IO_EXTRACT(R_DMA_CH6_CMD, cmd, *info->icmdadr) ==
1966 IO_STATE_VALUE(R_DMA_CH6_CMD, cmd, reset));
1968 start_recv_dma(info);
1973 /* the bits in the MASK2 register are laid out like this:
1974 DMAI_EOP DMAI_DESCR DMAO_EOP DMAO_DESCR
1975 where I is the input channel and O is the output channel for the port.
1976 info->irq is the bit number for the DMAO_DESCR so to check the others we
1977 shift info->irq to the left.
1980 /* dma output channel interrupt handler
1981 this interrupt is called from DMA2(ser2), DMA4(ser3), DMA6(ser0) or
1982 DMA8(ser1) when they have finished a descriptor with the intr flag set.
1986 tr_interrupt(int irq, void *dev_id)
1988 struct e100_serial *info;
1993 #ifdef CONFIG_SVINTO_SIM
1994 /* No receive in the simulator. Will probably be when the rest of
1995 * the serial interface works, and this piece will just be removed.
1998 const char *s = "What? tr_interrupt in simulator??\n";
1999 SIMCOUT(s,strlen(s));
2004 /* find out the line that caused this irq and get it from rs_table */
2006 ireg = *R_IRQ_MASK2_RD; /* get the active irq bits for the dma channels */
2008 for (i = 0; i < NR_PORTS; i++) {
2009 info = rs_table + i;
2010 if (!info->enabled || !info->uses_dma_out)
2012 /* check for dma_descr (don't need to check for dma_eop in output dma for serial */
2013 if (ireg & info->irq) {
2015 /* we can send a new dma bunch. make it so. */
2016 DINTR2(DEBUG_LOG(info->line, "tr_interrupt %i\n", i));
2017 /* Read jiffies_usec first,
2018 * we want this time to be as late as possible
2020 PROCSTAT(ser_stat[info->line].tx_dma_ints++);
2021 info->last_tx_active_usec = GET_JIFFIES_USEC();
2022 info->last_tx_active = jiffies;
2023 transmit_chars_dma(info);
2026 /* FIXME: here we should really check for a change in the
2027 status lines and if so call status_handle(info) */
2029 return IRQ_RETVAL(handled);
2030 } /* tr_interrupt */
2032 /* dma input channel interrupt handler */
2035 rec_interrupt(int irq, void *dev_id)
2037 struct e100_serial *info;
2042 #ifdef CONFIG_SVINTO_SIM
2043 /* No receive in the simulator. Will probably be when the rest of
2044 * the serial interface works, and this piece will just be removed.
2047 const char *s = "What? rec_interrupt in simulator??\n";
2048 SIMCOUT(s,strlen(s));
2053 /* find out the line that caused this irq and get it from rs_table */
2055 ireg = *R_IRQ_MASK2_RD; /* get the active irq bits for the dma channels */
2057 for (i = 0; i < NR_PORTS; i++) {
2058 info = rs_table + i;
2059 if (!info->enabled || !info->uses_dma_in)
2061 /* check for both dma_eop and dma_descr for the input dma channel */
2062 if (ireg & ((info->irq << 2) | (info->irq << 3))) {
2064 /* we have received something */
2065 receive_chars_dma(info);
2068 /* FIXME: here we should really check for a change in the
2069 status lines and if so call status_handle(info) */
2071 return IRQ_RETVAL(handled);
2072 } /* rec_interrupt */
2074 static int force_eop_if_needed(struct e100_serial *info)
2076 /* We check data_avail bit to determine if data has
2077 * arrived since last time
2079 unsigned char rstat = info->ioport[REG_STATUS];
2081 /* error or datavail? */
2082 if (rstat & SER_ERROR_MASK) {
2083 /* Some error has occurred. If there has been valid data, an
2084 * EOP interrupt will be made automatically. If no data, the
2085 * normal ser_interrupt should be enabled and handle it.
2088 DEBUG_LOG(info->line, "timeout err: rstat 0x%03X\n",
2089 rstat | (info->line << 8));
2093 if (rstat & SER_DATA_AVAIL_MASK) {
2094 /* Ok data, no error, count it */
2095 TIMERD(DEBUG_LOG(info->line, "timeout: rstat 0x%03X\n",
2096 rstat | (info->line << 8)));
2097 /* Read data to clear status flags */
2098 (void)info->ioport[REG_DATA];
2100 info->forced_eop = 0;
2101 START_FLUSH_FAST_TIMER(info, "magic");
2105 /* hit the timeout, force an EOP for the input
2106 * dma channel if we haven't already
2108 if (!info->forced_eop) {
2109 info->forced_eop = 1;
2110 PROCSTAT(ser_stat[info->line].timeout_flush_cnt++);
2111 TIMERD(DEBUG_LOG(info->line, "timeout EOP %i\n", info->line));
2118 static void flush_to_flip_buffer(struct e100_serial *info)
2120 struct tty_struct *tty;
2121 struct etrax_recv_buffer *buffer;
2122 unsigned long flags;
2124 local_irq_save(flags);
2125 tty = info->port.tty;
2128 local_irq_restore(flags);
2132 while ((buffer = info->first_recv_buffer) != NULL) {
2133 unsigned int count = buffer->length;
2135 tty_insert_flip_string(tty, buffer->buffer, count);
2136 info->recv_cnt -= count;
2138 if (count == buffer->length) {
2139 info->first_recv_buffer = buffer->next;
2142 buffer->length -= count;
2143 memmove(buffer->buffer, buffer->buffer + count, buffer->length);
2144 buffer->error = TTY_NORMAL;
2148 if (!info->first_recv_buffer)
2149 info->last_recv_buffer = NULL;
2151 local_irq_restore(flags);
2153 /* This includes a check for low-latency */
2154 tty_flip_buffer_push(tty);
2157 static void check_flush_timeout(struct e100_serial *info)
2159 /* Flip what we've got (if we can) */
2160 flush_to_flip_buffer(info);
2162 /* We might need to flip later, but not to fast
2163 * since the system is busy processing input... */
2164 if (info->first_recv_buffer)
2165 START_FLUSH_FAST_TIMER_TIME(info, "flip", 2000);
2167 /* Force eop last, since data might have come while we're processing
2168 * and if we started the slow timer above, we won't start a fast
2171 force_eop_if_needed(info);
2174 #ifdef CONFIG_ETRAX_SERIAL_FAST_TIMER
2175 static void flush_timeout_function(unsigned long data)
2177 struct e100_serial *info = (struct e100_serial *)data;
2179 fast_timers[info->line].function = NULL;
2180 serial_fast_timer_expired++;
2181 TIMERD(DEBUG_LOG(info->line, "flush_timout %i ", info->line));
2182 TIMERD(DEBUG_LOG(info->line, "num expired: %i\n", serial_fast_timer_expired));
2183 check_flush_timeout(info);
2188 /* dma fifo/buffer timeout handler
2189 forces an end-of-packet for the dma input channel if no chars
2190 have been received for CONFIG_ETRAX_SERIAL_RX_TIMEOUT_TICKS/100 s.
2193 static struct timer_list flush_timer;
2196 timed_flush_handler(unsigned long ptr)
2198 struct e100_serial *info;
2201 #ifdef CONFIG_SVINTO_SIM
2205 for (i = 0; i < NR_PORTS; i++) {
2206 info = rs_table + i;
2207 if (info->uses_dma_in)
2208 check_flush_timeout(info);
2211 /* restart flush timer */
2212 mod_timer(&flush_timer, jiffies + CONFIG_ETRAX_SERIAL_RX_TIMEOUT_TICKS);
2216 #ifdef SERIAL_HANDLE_EARLY_ERRORS
2218 /* If there is an error (ie break) when the DMA is running and
2219 * there are no bytes in the fifo the DMA is stopped and we get no
2220 * eop interrupt. Thus we have to monitor the first bytes on a DMA
2221 * transfer, and if it is without error we can turn the serial
2226 BREAK handling on ETRAX 100:
2227 ETRAX will generate interrupt although there is no stop bit between the
2230 Depending on how long the break sequence is, the end of the breaksequence
2231 will look differently:
2232 | indicates start/end of a character.
2234 B= Break character (0x00) with framing error.
2235 E= Error byte with parity error received after B characters.
2236 F= "Faked" valid byte received immediately after B characters.
2240 B BL ___________________________ V
2241 .._|__________|__________| |valid data |
2243 Multiple frame errors with data == 0x00 (B),
2244 the timing matches up "perfectly" so no extra ending char is detected.
2245 The RXD pin is 1 in the last interrupt, in that case
2246 we set info->errorcode = ERRCODE_INSERT_BREAK, but we can't really
2247 know if another byte will come and this really is case 2. below
2248 (e.g F=0xFF or 0xFE)
2249 If RXD pin is 0 we can expect another character (see 2. below).
2254 B B E or F__________________..__ V
2255 .._|__________|__________|______ | |valid data
2259 Multiple frame errors with data == 0x00 (B),
2260 but the part of the break trigs is interpreted as a start bit (and possibly
2261 some 0 bits followed by a number of 1 bits and a stop bit).
2262 Depending on parity settings etc. this last character can be either
2263 a fake "valid" char (F) or have a parity error (E).
2265 If the character is valid it will be put in the buffer,
2266 we set info->errorcode = ERRCODE_SET_BREAK so the receive interrupt
2267 will set the flags so the tty will handle it,
2268 if it's an error byte it will not be put in the buffer
2269 and we set info->errorcode = ERRCODE_INSERT_BREAK.
2271 To distinguish a V byte in 1. from an F byte in 2. we keep a timestamp
2272 of the last faulty char (B) and compares it with the current time:
2273 If the time elapsed time is less then 2*char_time_usec we will assume
2274 it's a faked F char and not a Valid char and set
2275 info->errorcode = ERRCODE_SET_BREAK.
2277 Flaws in the above solution:
2278 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
2279 We use the timer to distinguish a F character from a V character,
2280 if a V character is to close after the break we might make the wrong decision.
2282 TODO: The break will be delayed until an F or V character is received.
2287 struct e100_serial * handle_ser_rx_interrupt_no_dma(struct e100_serial *info)
2289 unsigned long data_read;
2290 struct tty_struct *tty = info->port.tty;
2293 printk("!NO TTY!\n");
2297 /* Read data and status at the same time */
2298 data_read = *((unsigned long *)&info->ioport[REG_DATA_STATUS32]);
2300 if (data_read & IO_MASK(R_SERIAL0_READ, xoff_detect) ) {
2301 DFLOW(DEBUG_LOG(info->line, "XOFF detect\n", 0));
2303 DINTR2(DEBUG_LOG(info->line, "ser_rx %c\n", IO_EXTRACT(R_SERIAL0_READ, data_in, data_read)));
2305 if (data_read & ( IO_MASK(R_SERIAL0_READ, framing_err) |
2306 IO_MASK(R_SERIAL0_READ, par_err) |
2307 IO_MASK(R_SERIAL0_READ, overrun) )) {
2309 info->last_rx_active_usec = GET_JIFFIES_USEC();
2310 info->last_rx_active = jiffies;
2311 DINTR1(DEBUG_LOG(info->line, "ser_rx err stat_data %04X\n", data_read));
2313 if (!log_int_trig1_pos) {
2314 log_int_trig1_pos = log_int_pos;
2315 log_int(rdpc(), 0, 0);
2320 if ( ((data_read & IO_MASK(R_SERIAL0_READ, data_in)) == 0) &&
2321 (data_read & IO_MASK(R_SERIAL0_READ, framing_err)) ) {
2322 /* Most likely a break, but we get interrupts over and
2326 if (!info->break_detected_cnt) {
2327 DEBUG_LOG(info->line, "#BRK start\n", 0);
2329 if (data_read & IO_MASK(R_SERIAL0_READ, rxd)) {
2330 /* The RX pin is high now, so the break
2331 * must be over, but....
2332 * we can't really know if we will get another
2333 * last byte ending the break or not.
2334 * And we don't know if the byte (if any) will
2335 * have an error or look valid.
2337 DEBUG_LOG(info->line, "# BL BRK\n", 0);
2338 info->errorcode = ERRCODE_INSERT_BREAK;
2340 info->break_detected_cnt++;
2342 /* The error does not look like a break, but could be
2345 if (info->break_detected_cnt) {
2346 DEBUG_LOG(info->line, "EBRK %i\n", info->break_detected_cnt);
2347 info->errorcode = ERRCODE_INSERT_BREAK;
2349 unsigned char data = IO_EXTRACT(R_SERIAL0_READ,
2350 data_in, data_read);
2351 char flag = TTY_NORMAL;
2352 if (info->errorcode == ERRCODE_INSERT_BREAK) {
2353 struct tty_struct *tty = info->port.tty;
2354 tty_insert_flip_char(tty, 0, flag);
2358 if (data_read & IO_MASK(R_SERIAL0_READ, par_err)) {
2359 info->icount.parity++;
2361 } else if (data_read & IO_MASK(R_SERIAL0_READ, overrun)) {
2362 info->icount.overrun++;
2364 } else if (data_read & IO_MASK(R_SERIAL0_READ, framing_err)) {
2365 info->icount.frame++;
2368 tty_insert_flip_char(tty, data, flag);
2369 info->errorcode = 0;
2371 info->break_detected_cnt = 0;
2373 } else if (data_read & IO_MASK(R_SERIAL0_READ, data_avail)) {
2376 if (!log_int_trig1_pos) {
2377 if (log_int_pos >= log_int_size) {
2380 log_int_trig0_pos = log_int_pos;
2381 log_int(rdpc(), 0, 0);
2384 tty_insert_flip_char(tty,
2385 IO_EXTRACT(R_SERIAL0_READ, data_in, data_read),
2388 DEBUG_LOG(info->line, "ser_rx int but no data_avail %08lX\n", data_read);
2393 data_read = *((unsigned long *)&info->ioport[REG_DATA_STATUS32]);
2394 if (data_read & IO_MASK(R_SERIAL0_READ, data_avail)) {
2395 DEBUG_LOG(info->line, "ser_rx %c in loop\n", IO_EXTRACT(R_SERIAL0_READ, data_in, data_read));
2399 tty_flip_buffer_push(info->port.tty);
2403 static struct e100_serial* handle_ser_rx_interrupt(struct e100_serial *info)
2405 unsigned char rstat;
2407 #ifdef SERIAL_DEBUG_INTR
2408 printk("Interrupt from serport %d\n", i);
2410 /* DEBUG_LOG(info->line, "ser_interrupt stat %03X\n", rstat | (i << 8)); */
2411 if (!info->uses_dma_in) {
2412 return handle_ser_rx_interrupt_no_dma(info);
2415 rstat = info->ioport[REG_STATUS];
2416 if (rstat & IO_MASK(R_SERIAL0_STATUS, xoff_detect) ) {
2417 DFLOW(DEBUG_LOG(info->line, "XOFF detect\n", 0));
2420 if (rstat & SER_ERROR_MASK) {
2423 info->last_rx_active_usec = GET_JIFFIES_USEC();
2424 info->last_rx_active = jiffies;
2425 /* If we got an error, we must reset it by reading the
2428 data = info->ioport[REG_DATA];
2429 DINTR1(DEBUG_LOG(info->line, "ser_rx! %c\n", data));
2430 DINTR1(DEBUG_LOG(info->line, "ser_rx err stat %02X\n", rstat));
2431 if (!data && (rstat & SER_FRAMING_ERR_MASK)) {
2432 /* Most likely a break, but we get interrupts over and
2436 if (!info->break_detected_cnt) {
2437 DEBUG_LOG(info->line, "#BRK start\n", 0);
2439 if (rstat & SER_RXD_MASK) {
2440 /* The RX pin is high now, so the break
2441 * must be over, but....
2442 * we can't really know if we will get another
2443 * last byte ending the break or not.
2444 * And we don't know if the byte (if any) will
2445 * have an error or look valid.
2447 DEBUG_LOG(info->line, "# BL BRK\n", 0);
2448 info->errorcode = ERRCODE_INSERT_BREAK;
2450 info->break_detected_cnt++;
2452 /* The error does not look like a break, but could be
2455 if (info->break_detected_cnt) {
2456 DEBUG_LOG(info->line, "EBRK %i\n", info->break_detected_cnt);
2457 info->errorcode = ERRCODE_INSERT_BREAK;
2459 if (info->errorcode == ERRCODE_INSERT_BREAK) {
2461 add_char_and_flag(info, '\0', TTY_BREAK);
2464 if (rstat & SER_PAR_ERR_MASK) {
2465 info->icount.parity++;
2466 add_char_and_flag(info, data, TTY_PARITY);
2467 } else if (rstat & SER_OVERRUN_MASK) {
2468 info->icount.overrun++;
2469 add_char_and_flag(info, data, TTY_OVERRUN);
2470 } else if (rstat & SER_FRAMING_ERR_MASK) {
2471 info->icount.frame++;
2472 add_char_and_flag(info, data, TTY_FRAME);
2475 info->errorcode = 0;
2477 info->break_detected_cnt = 0;
2478 DEBUG_LOG(info->line, "#iERR s d %04X\n",
2479 ((rstat & SER_ERROR_MASK) << 8) | data);
2481 PROCSTAT(ser_stat[info->line].early_errors_cnt++);
2482 } else { /* It was a valid byte, now let the DMA do the rest */
2483 unsigned long curr_time_u = GET_JIFFIES_USEC();
2484 unsigned long curr_time = jiffies;
2486 if (info->break_detected_cnt) {
2487 /* Detect if this character is a new valid char or the
2488 * last char in a break sequence: If LSBits are 0 and
2489 * MSBits are high AND the time is close to the
2490 * previous interrupt we should discard it.
2493 (curr_time - info->last_rx_active) * (1000000/HZ) +
2494 curr_time_u - info->last_rx_active_usec;
2495 if (elapsed_usec < 2*info->char_time_usec) {
2496 DEBUG_LOG(info->line, "FBRK %i\n", info->line);
2497 /* Report as BREAK (error) and let
2498 * receive_chars_dma() handle it
2500 info->errorcode = ERRCODE_SET_BREAK;
2502 DEBUG_LOG(info->line, "Not end of BRK (V)%i\n", info->line);
2504 DEBUG_LOG(info->line, "num brk %i\n", info->break_detected_cnt);
2507 #ifdef SERIAL_DEBUG_INTR
2508 printk("** OK, disabling ser_interrupts\n");
2510 e100_disable_serial_data_irq(info);
2511 DINTR2(DEBUG_LOG(info->line, "ser_rx OK %d\n", info->line));
2512 info->break_detected_cnt = 0;
2514 PROCSTAT(ser_stat[info->line].ser_ints_ok_cnt++);
2516 /* Restarting the DMA never hurts */
2517 *info->icmdadr = IO_STATE(R_DMA_CH6_CMD, cmd, restart);
2518 START_FLUSH_FAST_TIMER(info, "ser_int");
2520 } /* handle_ser_rx_interrupt */
2522 static void handle_ser_tx_interrupt(struct e100_serial *info)
2524 unsigned long flags;
2527 unsigned char rstat;
2528 DFLOW(DEBUG_LOG(info->line, "tx_int: xchar 0x%02X\n", info->x_char));
2529 local_irq_save(flags);
2530 rstat = info->ioport[REG_STATUS];
2531 DFLOW(DEBUG_LOG(info->line, "stat %x\n", rstat));
2533 info->ioport[REG_TR_DATA] = info->x_char;
2536 /* We must enable since it is disabled in ser_interrupt */
2537 e100_enable_serial_tx_ready_irq(info);
2538 local_irq_restore(flags);
2541 if (info->uses_dma_out) {
2542 unsigned char rstat;
2544 /* We only use normal tx interrupt when sending x_char */
2545 DFLOW(DEBUG_LOG(info->line, "tx_int: xchar sent\n", 0));
2546 local_irq_save(flags);
2547 rstat = info->ioport[REG_STATUS];
2548 DFLOW(DEBUG_LOG(info->line, "stat %x\n", rstat));
2549 e100_disable_serial_tx_ready_irq(info);
2550 if (info->port.tty->stopped)
2551 rs_stop(info->port.tty);
2552 /* Enable the DMA channel and tell it to continue */
2553 e100_enable_txdma_channel(info);
2554 /* Wait 12 cycles before doing the DMA command */
2555 for(i = 6; i > 0; i--)
2558 *info->ocmdadr = IO_STATE(R_DMA_CH6_CMD, cmd, continue);
2559 local_irq_restore(flags);
2562 /* Normal char-by-char interrupt */
2563 if (info->xmit.head == info->xmit.tail
2564 || info->port.tty->stopped
2565 || info->port.tty->hw_stopped) {
2566 DFLOW(DEBUG_LOG(info->line, "tx_int: stopped %i\n",
2567 info->port.tty->stopped));
2568 e100_disable_serial_tx_ready_irq(info);
2569 info->tr_running = 0;
2572 DINTR2(DEBUG_LOG(info->line, "tx_int %c\n", info->xmit.buf[info->xmit.tail]));
2573 /* Send a byte, rs485 timing is critical so turn of ints */
2574 local_irq_save(flags);
2575 info->ioport[REG_TR_DATA] = info->xmit.buf[info->xmit.tail];
2576 info->xmit.tail = (info->xmit.tail + 1) & (SERIAL_XMIT_SIZE-1);
2578 if (info->xmit.head == info->xmit.tail) {
2579 #if defined(CONFIG_ETRAX_RS485) && defined(CONFIG_ETRAX_FAST_TIMER)
2580 if (info->rs485.enabled) {
2581 /* Set a short timer to toggle RTS */
2582 start_one_shot_timer(&fast_timers_rs485[info->line],
2583 rs485_toggle_rts_timer_function,
2584 (unsigned long)info,
2585 info->char_time_usec*2,
2589 info->last_tx_active_usec = GET_JIFFIES_USEC();
2590 info->last_tx_active = jiffies;
2591 e100_disable_serial_tx_ready_irq(info);
2592 info->tr_running = 0;
2593 DFLOW(DEBUG_LOG(info->line, "tx_int: stop2\n", 0));
2595 /* We must enable since it is disabled in ser_interrupt */
2596 e100_enable_serial_tx_ready_irq(info);
2598 local_irq_restore(flags);
2600 if (CIRC_CNT(info->xmit.head,
2602 SERIAL_XMIT_SIZE) < WAKEUP_CHARS)
2603 rs_sched_event(info, RS_EVENT_WRITE_WAKEUP);
2605 } /* handle_ser_tx_interrupt */
2607 /* result of time measurements:
2608 * RX duration 54-60 us when doing something, otherwise 6-9 us
2609 * ser_int duration: just sending: 8-15 us normally, up to 73 us
2612 ser_interrupt(int irq, void *dev_id)
2614 static volatile int tx_started = 0;
2615 struct e100_serial *info;
2617 unsigned long flags;
2618 unsigned long irq_mask1_rd;
2619 unsigned long data_mask = (1 << (8+2*0)); /* ser0 data_avail */
2621 static volatile unsigned long reentered_ready_mask = 0;
2623 local_irq_save(flags);
2624 irq_mask1_rd = *R_IRQ_MASK1_RD;
2625 /* First handle all rx interrupts with ints disabled */
2627 irq_mask1_rd &= e100_ser_int_mask;
2628 for (i = 0; i < NR_PORTS; i++) {
2629 /* Which line caused the data irq? */
2630 if (irq_mask1_rd & data_mask) {
2632 handle_ser_rx_interrupt(info);
2637 /* Handle tx interrupts with interrupts enabled so we
2638 * can take care of new data interrupts while transmitting
2639 * We protect the tx part with the tx_started flag.
2640 * We disable the tr_ready interrupts we are about to handle and
2641 * unblock the serial interrupt so new serial interrupts may come.
2643 * If we get a new interrupt:
2644 * - it migth be due to synchronous serial ports.
2645 * - serial irq will be blocked by general irq handler.
2646 * - async data will be handled above (sync will be ignored).
2647 * - tx_started flag will prevent us from trying to send again and
2648 * we will exit fast - no need to unblock serial irq.
2649 * - Next (sync) serial interrupt handler will be runned with
2650 * disabled interrupt due to restore_flags() at end of function,
2651 * so sync handler will not be preempted or reentered.
2654 unsigned long ready_mask;
2657 /* Only the tr_ready interrupts left */
2658 irq_mask1_rd &= (IO_MASK(R_IRQ_MASK1_RD, ser0_ready) |
2659 IO_MASK(R_IRQ_MASK1_RD, ser1_ready) |
2660 IO_MASK(R_IRQ_MASK1_RD, ser2_ready) |
2661 IO_MASK(R_IRQ_MASK1_RD, ser3_ready));
2662 while (irq_mask1_rd) {
2663 /* Disable those we are about to handle */
2664 *R_IRQ_MASK1_CLR = irq_mask1_rd;
2665 /* Unblock the serial interrupt */
2666 *R_VECT_MASK_SET = IO_STATE(R_VECT_MASK_SET, serial, set);
2669 ready_mask = (1 << (8+1+2*0)); /* ser0 tr_ready */
2671 for (i = 0; i < NR_PORTS; i++) {
2672 /* Which line caused the ready irq? */
2673 if (irq_mask1_rd & ready_mask) {
2675 handle_ser_tx_interrupt(info);
2680 /* handle_ser_tx_interrupt enables tr_ready interrupts */
2681 local_irq_disable();
2682 /* Handle reentered TX interrupt */
2683 irq_mask1_rd = reentered_ready_mask;
2685 local_irq_disable();
2688 unsigned long ready_mask;
2689 ready_mask = irq_mask1_rd & (IO_MASK(R_IRQ_MASK1_RD, ser0_ready) |
2690 IO_MASK(R_IRQ_MASK1_RD, ser1_ready) |
2691 IO_MASK(R_IRQ_MASK1_RD, ser2_ready) |
2692 IO_MASK(R_IRQ_MASK1_RD, ser3_ready));
2694 reentered_ready_mask |= ready_mask;
2695 /* Disable those we are about to handle */
2696 *R_IRQ_MASK1_CLR = ready_mask;
2697 DFLOW(DEBUG_LOG(SERIAL_DEBUG_LINE, "ser_int reentered with TX %X\n", ready_mask));
2701 local_irq_restore(flags);
2702 return IRQ_RETVAL(handled);
2703 } /* ser_interrupt */
2707 * -------------------------------------------------------------------
2708 * Here ends the serial interrupt routines.
2709 * -------------------------------------------------------------------
2713 * This routine is used to handle the "bottom half" processing for the
2714 * serial driver, known also the "software interrupt" processing.
2715 * This processing is done at the kernel interrupt level, after the
2716 * rs_interrupt() has returned, BUT WITH INTERRUPTS TURNED ON. This
2717 * is where time-consuming activities which can not be done in the
2718 * interrupt driver proper are done; the interrupt driver schedules
2719 * them using rs_sched_event(), and they get done here.
2722 do_softint(struct work_struct *work)
2724 struct e100_serial *info;
2725 struct tty_struct *tty;
2727 info = container_of(work, struct e100_serial, work);
2729 tty = info->port.tty;
2733 if (test_and_clear_bit(RS_EVENT_WRITE_WAKEUP, &info->event))
2738 startup(struct e100_serial * info)
2740 unsigned long flags;
2741 unsigned long xmit_page;
2744 xmit_page = get_zeroed_page(GFP_KERNEL);
2748 local_irq_save(flags);
2750 /* if it was already initialized, skip this */
2752 if (info->flags & ASYNC_INITIALIZED) {
2753 local_irq_restore(flags);
2754 free_page(xmit_page);
2759 free_page(xmit_page);
2761 info->xmit.buf = (unsigned char *) xmit_page;
2763 #ifdef SERIAL_DEBUG_OPEN
2764 printk("starting up ttyS%d (xmit_buf 0x%p)...\n", info->line, info->xmit.buf);
2767 #ifdef CONFIG_SVINTO_SIM
2768 /* Bits and pieces collected from below. Better to have them
2769 in one ifdef:ed clause than to mix in a lot of ifdefs,
2772 clear_bit(TTY_IO_ERROR, &info->port.tty->flags);
2774 info->xmit.head = info->xmit.tail = 0;
2775 info->first_recv_buffer = info->last_recv_buffer = NULL;
2776 info->recv_cnt = info->max_recv_cnt = 0;
2778 for (i = 0; i < SERIAL_RECV_DESCRIPTORS; i++)
2779 info->rec_descr[i].buf = NULL;
2781 /* No real action in the simulator, but may set info important
2787 * Clear the FIFO buffers and disable them
2788 * (they will be reenabled in change_speed())
2792 * Reset the DMA channels and make sure their interrupts are cleared
2795 if (info->dma_in_enabled) {
2796 info->uses_dma_in = 1;
2797 e100_enable_rxdma_channel(info);
2799 *info->icmdadr = IO_STATE(R_DMA_CH6_CMD, cmd, reset);
2801 /* Wait until reset cycle is complete */
2802 while (IO_EXTRACT(R_DMA_CH6_CMD, cmd, *info->icmdadr) ==
2803 IO_STATE_VALUE(R_DMA_CH6_CMD, cmd, reset));
2805 /* Make sure the irqs are cleared */
2806 *info->iclrintradr =
2807 IO_STATE(R_DMA_CH6_CLR_INTR, clr_descr, do) |
2808 IO_STATE(R_DMA_CH6_CLR_INTR, clr_eop, do);
2810 e100_disable_rxdma_channel(info);
2813 if (info->dma_out_enabled) {
2814 info->uses_dma_out = 1;
2815 e100_enable_txdma_channel(info);
2816 *info->ocmdadr = IO_STATE(R_DMA_CH6_CMD, cmd, reset);
2818 while (IO_EXTRACT(R_DMA_CH6_CMD, cmd, *info->ocmdadr) ==
2819 IO_STATE_VALUE(R_DMA_CH6_CMD, cmd, reset));
2821 /* Make sure the irqs are cleared */
2822 *info->oclrintradr =
2823 IO_STATE(R_DMA_CH6_CLR_INTR, clr_descr, do) |
2824 IO_STATE(R_DMA_CH6_CLR_INTR, clr_eop, do);
2826 e100_disable_txdma_channel(info);
2830 clear_bit(TTY_IO_ERROR, &info->port.tty->flags);
2832 info->xmit.head = info->xmit.tail = 0;
2833 info->first_recv_buffer = info->last_recv_buffer = NULL;
2834 info->recv_cnt = info->max_recv_cnt = 0;
2836 for (i = 0; i < SERIAL_RECV_DESCRIPTORS; i++)
2837 info->rec_descr[i].buf = 0;
2840 * and set the speed and other flags of the serial port
2841 * this will start the rx/tx as well
2843 #ifdef SERIAL_HANDLE_EARLY_ERRORS
2844 e100_enable_serial_data_irq(info);
2848 /* dummy read to reset any serial errors */
2850 (void)info->ioport[REG_DATA];
2852 /* enable the interrupts */
2853 if (info->uses_dma_out)
2854 e100_enable_txdma_irq(info);
2856 e100_enable_rx_irq(info);
2858 info->tr_running = 0; /* to be sure we don't lock up the transmitter */
2860 /* setup the dma input descriptor and start dma */
2862 start_receive(info);
2864 /* for safety, make sure the descriptors last result is 0 bytes written */
2866 info->tr_descr.sw_len = 0;
2867 info->tr_descr.hw_len = 0;
2868 info->tr_descr.status = 0;
2870 /* enable RTS/DTR last */
2875 #endif /* CONFIG_SVINTO_SIM */
2877 info->flags |= ASYNC_INITIALIZED;
2879 local_irq_restore(flags);
2884 * This routine will shutdown a serial port; interrupts are disabled, and
2885 * DTR is dropped if the hangup on close termio flag is on.
2888 shutdown(struct e100_serial * info)
2890 unsigned long flags;
2891 struct etrax_dma_descr *descr = info->rec_descr;
2892 struct etrax_recv_buffer *buffer;
2895 #ifndef CONFIG_SVINTO_SIM
2896 /* shut down the transmitter and receiver */
2897 DFLOW(DEBUG_LOG(info->line, "shutdown %i\n", info->line));
2898 e100_disable_rx(info);
2899 info->ioport[REG_TR_CTRL] = (info->tx_ctrl &= ~0x40);
2901 /* disable interrupts, reset dma channels */
2902 if (info->uses_dma_in) {
2903 e100_disable_rxdma_irq(info);
2904 *info->icmdadr = IO_STATE(R_DMA_CH6_CMD, cmd, reset);
2905 info->uses_dma_in = 0;
2907 e100_disable_serial_data_irq(info);
2910 if (info->uses_dma_out) {
2911 e100_disable_txdma_irq(info);
2912 info->tr_running = 0;
2913 *info->ocmdadr = IO_STATE(R_DMA_CH6_CMD, cmd, reset);
2914 info->uses_dma_out = 0;
2916 e100_disable_serial_tx_ready_irq(info);
2917 info->tr_running = 0;
2920 #endif /* CONFIG_SVINTO_SIM */
2922 if (!(info->flags & ASYNC_INITIALIZED))
2925 #ifdef SERIAL_DEBUG_OPEN
2926 printk("Shutting down serial port %d (irq %d)....\n", info->line,
2930 local_irq_save(flags);
2932 if (info->xmit.buf) {
2933 free_page((unsigned long)info->xmit.buf);
2934 info->xmit.buf = NULL;
2937 for (i = 0; i < SERIAL_RECV_DESCRIPTORS; i++)
2939 buffer = phys_to_virt(descr[i].buf) - sizeof *buffer;
2944 if (!info->port.tty || (info->port.tty->termios->c_cflag & HUPCL)) {
2945 /* hang up DTR and RTS if HUPCL is enabled */
2947 e100_rts(info, 0); /* could check CRTSCTS before doing this */
2951 set_bit(TTY_IO_ERROR, &info->port.tty->flags);
2953 info->flags &= ~ASYNC_INITIALIZED;
2954 local_irq_restore(flags);
2958 /* change baud rate and other assorted parameters */
2961 change_speed(struct e100_serial *info)
2965 unsigned long flags;
2966 /* first some safety checks */
2968 if (!info->port.tty || !info->port.tty->termios)
2973 cflag = info->port.tty->termios->c_cflag;
2975 /* possibly, the tx/rx should be disabled first to do this safely */
2977 /* change baud-rate and write it to the hardware */
2978 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST) {
2979 /* Special baudrate */
2980 u32 mask = 0xFF << (info->line*8); /* Each port has 8 bits */
2981 unsigned long alt_source =
2982 IO_STATE(R_ALT_SER_BAUDRATE, ser0_rec, normal) |
2983 IO_STATE(R_ALT_SER_BAUDRATE, ser0_tr, normal);
2984 /* R_ALT_SER_BAUDRATE selects the source */
2985 DBAUD(printk("Custom baudrate: baud_base/divisor %lu/%i\n",
2986 (unsigned long)info->baud_base, info->custom_divisor));
2987 if (info->baud_base == SERIAL_PRESCALE_BASE) {
2988 /* 0, 2-65535 (0=65536) */
2989 u16 divisor = info->custom_divisor;
2990 /* R_SERIAL_PRESCALE (upper 16 bits of R_CLOCK_PRESCALE) */
2991 /* baudrate is 3.125MHz/custom_divisor */
2993 IO_STATE(R_ALT_SER_BAUDRATE, ser0_rec, prescale) |
2994 IO_STATE(R_ALT_SER_BAUDRATE, ser0_tr, prescale);
2996 DBAUD(printk("Writing SERIAL_PRESCALE: divisor %i\n", divisor));
2997 *R_SERIAL_PRESCALE = divisor;
2998 info->baud = SERIAL_PRESCALE_BASE/divisor;
3000 #ifdef CONFIG_ETRAX_EXTERN_PB6CLK_ENABLED
3001 else if ((info->baud_base==CONFIG_ETRAX_EXTERN_PB6CLK_FREQ/8 &&
3002 info->custom_divisor == 1) ||
3003 (info->baud_base==CONFIG_ETRAX_EXTERN_PB6CLK_FREQ &&
3004 info->custom_divisor == 8)) {
3005 /* ext_clk selected */
3007 IO_STATE(R_ALT_SER_BAUDRATE, ser0_rec, extern) |
3008 IO_STATE(R_ALT_SER_BAUDRATE, ser0_tr, extern);
3009 DBAUD(printk("using external baudrate: %lu\n", CONFIG_ETRAX_EXTERN_PB6CLK_FREQ/8));
3010 info->baud = CONFIG_ETRAX_EXTERN_PB6CLK_FREQ/8;
3015 /* Bad baudbase, we don't support using timer0
3018 printk(KERN_WARNING "Bad baud_base/custom_divisor: %lu/%i\n",
3019 (unsigned long)info->baud_base, info->custom_divisor);
3021 r_alt_ser_baudrate_shadow &= ~mask;
3022 r_alt_ser_baudrate_shadow |= (alt_source << (info->line*8));
3023 *R_ALT_SER_BAUDRATE = r_alt_ser_baudrate_shadow;
3025 /* Normal baudrate */
3026 /* Make sure we use normal baudrate */
3027 u32 mask = 0xFF << (info->line*8); /* Each port has 8 bits */
3028 unsigned long alt_source =
3029 IO_STATE(R_ALT_SER_BAUDRATE, ser0_rec, normal) |
3030 IO_STATE(R_ALT_SER_BAUDRATE, ser0_tr, normal);
3031 r_alt_ser_baudrate_shadow &= ~mask;
3032 r_alt_ser_baudrate_shadow |= (alt_source << (info->line*8));
3033 #ifndef CONFIG_SVINTO_SIM
3034 *R_ALT_SER_BAUDRATE = r_alt_ser_baudrate_shadow;
3035 #endif /* CONFIG_SVINTO_SIM */
3037 info->baud = cflag_to_baud(cflag);
3038 #ifndef CONFIG_SVINTO_SIM
3039 info->ioport[REG_BAUD] = cflag_to_etrax_baud(cflag);
3040 #endif /* CONFIG_SVINTO_SIM */
3043 #ifndef CONFIG_SVINTO_SIM
3044 /* start with default settings and then fill in changes */
3045 local_irq_save(flags);
3046 /* 8 bit, no/even parity */
3047 info->rx_ctrl &= ~(IO_MASK(R_SERIAL0_REC_CTRL, rec_bitnr) |
3048 IO_MASK(R_SERIAL0_REC_CTRL, rec_par_en) |
3049 IO_MASK(R_SERIAL0_REC_CTRL, rec_par));
3051 /* 8 bit, no/even parity, 1 stop bit, no cts */
3052 info->tx_ctrl &= ~(IO_MASK(R_SERIAL0_TR_CTRL, tr_bitnr) |
3053 IO_MASK(R_SERIAL0_TR_CTRL, tr_par_en) |
3054 IO_MASK(R_SERIAL0_TR_CTRL, tr_par) |
3055 IO_MASK(R_SERIAL0_TR_CTRL, stop_bits) |
3056 IO_MASK(R_SERIAL0_TR_CTRL, auto_cts));
3058 if ((cflag & CSIZE) == CS7) {
3059 /* set 7 bit mode */
3060 info->tx_ctrl |= IO_STATE(R_SERIAL0_TR_CTRL, tr_bitnr, tr_7bit);
3061 info->rx_ctrl |= IO_STATE(R_SERIAL0_REC_CTRL, rec_bitnr, rec_7bit);
3064 if (cflag & CSTOPB) {
3065 /* set 2 stop bit mode */
3066 info->tx_ctrl |= IO_STATE(R_SERIAL0_TR_CTRL, stop_bits, two_bits);
3069 if (cflag & PARENB) {
3071 info->tx_ctrl |= IO_STATE(R_SERIAL0_TR_CTRL, tr_par_en, enable);
3072 info->rx_ctrl |= IO_STATE(R_SERIAL0_REC_CTRL, rec_par_en, enable);
3075 if (cflag & CMSPAR) {
3076 /* enable stick parity, PARODD mean Mark which matches ETRAX */
3077 info->tx_ctrl |= IO_STATE(R_SERIAL0_TR_CTRL, tr_stick_par, stick);
3078 info->rx_ctrl |= IO_STATE(R_SERIAL0_REC_CTRL, rec_stick_par, stick);
3080 if (cflag & PARODD) {
3081 /* set odd parity (or Mark if CMSPAR) */
3082 info->tx_ctrl |= IO_STATE(R_SERIAL0_TR_CTRL, tr_par, odd);
3083 info->rx_ctrl |= IO_STATE(R_SERIAL0_REC_CTRL, rec_par, odd);
3086 if (cflag & CRTSCTS) {
3087 /* enable automatic CTS handling */
3088 DFLOW(DEBUG_LOG(info->line, "FLOW auto_cts enabled\n", 0));
3089 info->tx_ctrl |= IO_STATE(R_SERIAL0_TR_CTRL, auto_cts, active);
3092 /* make sure the tx and rx are enabled */
3094 info->tx_ctrl |= IO_STATE(R_SERIAL0_TR_CTRL, tr_enable, enable);
3095 info->rx_ctrl |= IO_STATE(R_SERIAL0_REC_CTRL, rec_enable, enable);
3097 /* actually write the control regs to the hardware */
3099 info->ioport[REG_TR_CTRL] = info->tx_ctrl;
3100 info->ioport[REG_REC_CTRL] = info->rx_ctrl;
3101 xoff = IO_FIELD(R_SERIAL0_XOFF, xoff_char, STOP_CHAR(info->port.tty));
3102 xoff |= IO_STATE(R_SERIAL0_XOFF, tx_stop, enable);
3103 if (info->port.tty->termios->c_iflag & IXON ) {
3104 DFLOW(DEBUG_LOG(info->line, "FLOW XOFF enabled 0x%02X\n",
3105 STOP_CHAR(info->port.tty)));
3106 xoff |= IO_STATE(R_SERIAL0_XOFF, auto_xoff, enable);
3109 *((unsigned long *)&info->ioport[REG_XOFF]) = xoff;
3110 local_irq_restore(flags);
3111 #endif /* !CONFIG_SVINTO_SIM */
3113 update_char_time(info);
3115 } /* change_speed */
3117 /* start transmitting chars NOW */
3120 rs_flush_chars(struct tty_struct *tty)
3122 struct e100_serial *info = (struct e100_serial *)tty->driver_data;
3123 unsigned long flags;
3125 if (info->tr_running ||
3126 info->xmit.head == info->xmit.tail ||
3132 #ifdef SERIAL_DEBUG_FLOW
3133 printk("rs_flush_chars\n");
3136 /* this protection might not exactly be necessary here */
3138 local_irq_save(flags);
3139 start_transmit(info);
3140 local_irq_restore(flags);
3143 static int rs_raw_write(struct tty_struct *tty,
3144 const unsigned char *buf, int count)
3147 struct e100_serial *info = (struct e100_serial *)tty->driver_data;
3148 unsigned long flags;
3150 /* first some sanity checks */
3152 if (!tty || !info->xmit.buf || !tmp_buf)
3155 #ifdef SERIAL_DEBUG_DATA
3156 if (info->line == SERIAL_DEBUG_LINE)
3157 printk("rs_raw_write (%d), status %d\n",
3158 count, info->ioport[REG_STATUS]);
3161 #ifdef CONFIG_SVINTO_SIM
3162 /* Really simple. The output is here and now. */
3163 SIMCOUT(buf, count);
3166 local_save_flags(flags);
3167 DFLOW(DEBUG_LOG(info->line, "write count %i ", count));
3168 DFLOW(DEBUG_LOG(info->line, "ldisc %i\n", tty->ldisc.chars_in_buffer(tty)));
3171 /* The local_irq_disable/restore_flags pairs below are needed
3172 * because the DMA interrupt handler moves the info->xmit values.
3173 * the memcpy needs to be in the critical region unfortunately,
3174 * because we need to read xmit values, memcpy, write xmit values
3175 * in one atomic operation... this could perhaps be avoided by
3176 * more clever design.
3178 local_irq_disable();
3180 c = CIRC_SPACE_TO_END(info->xmit.head,
3189 memcpy(info->xmit.buf + info->xmit.head, buf, c);
3190 info->xmit.head = (info->xmit.head + c) &
3191 (SERIAL_XMIT_SIZE-1);
3196 local_irq_restore(flags);
3198 /* enable transmitter if not running, unless the tty is stopped
3199 * this does not need IRQ protection since if tr_running == 0
3200 * the IRQ's are not running anyway for this port.
3202 DFLOW(DEBUG_LOG(info->line, "write ret %i\n", ret));
3204 if (info->xmit.head != info->xmit.tail &&
3207 !info->tr_running) {
3208 start_transmit(info);
3212 } /* raw_raw_write() */
3215 rs_write(struct tty_struct *tty,
3216 const unsigned char *buf, int count)
3218 #if defined(CONFIG_ETRAX_RS485)
3219 struct e100_serial *info = (struct e100_serial *)tty->driver_data;
3221 if (info->rs485.enabled)
3223 /* If we are in RS-485 mode, we need to toggle RTS and disable
3224 * the receiver before initiating a DMA transfer
3226 #ifdef CONFIG_ETRAX_FAST_TIMER
3227 /* Abort any started timer */
3228 fast_timers_rs485[info->line].function = NULL;
3229 del_fast_timer(&fast_timers_rs485[info->line]);
3231 e100_rts(info, info->rs485.rts_on_send);
3232 #if defined(CONFIG_ETRAX_RS485_DISABLE_RECEIVER)
3233 e100_disable_rx(info);
3234 e100_enable_rx_irq(info);
3237 if (info->rs485.delay_rts_before_send > 0)
3238 msleep(info->rs485.delay_rts_before_send);
3240 #endif /* CONFIG_ETRAX_RS485 */
3242 count = rs_raw_write(tty, buf, count);
3244 #if defined(CONFIG_ETRAX_RS485)
3245 if (info->rs485.enabled)
3248 /* If we are in RS-485 mode the following has to be done:
3249 * wait until DMA is ready
3250 * wait on transmit shift register
3252 * enable the receiver
3255 /* Sleep until all sent */
3256 tty_wait_until_sent(tty, 0);
3257 #ifdef CONFIG_ETRAX_FAST_TIMER
3258 /* Now sleep a little more so that shift register is empty */
3259 schedule_usleep(info->char_time_usec * 2);
3261 /* wait on transmit shift register */
3263 get_lsr_info(info, &val);
3264 }while (!(val & TIOCSER_TEMT));
3266 e100_rts(info, info->rs485.rts_after_sent);
3268 #if defined(CONFIG_ETRAX_RS485_DISABLE_RECEIVER)
3269 e100_enable_rx(info);
3270 e100_enable_rxdma_irq(info);
3273 #endif /* CONFIG_ETRAX_RS485 */
3279 /* how much space is available in the xmit buffer? */
3282 rs_write_room(struct tty_struct *tty)
3284 struct e100_serial *info = (struct e100_serial *)tty->driver_data;
3286 return CIRC_SPACE(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
3289 /* How many chars are in the xmit buffer?
3290 * This does not include any chars in the transmitter FIFO.
3291 * Use wait_until_sent for waiting for FIFO drain.
3295 rs_chars_in_buffer(struct tty_struct *tty)
3297 struct e100_serial *info = (struct e100_serial *)tty->driver_data;
3299 return CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
3302 /* discard everything in the xmit buffer */
3305 rs_flush_buffer(struct tty_struct *tty)
3307 struct e100_serial *info = (struct e100_serial *)tty->driver_data;
3308 unsigned long flags;
3310 local_irq_save(flags);
3311 info->xmit.head = info->xmit.tail = 0;
3312 local_irq_restore(flags);
3318 * This function is used to send a high-priority XON/XOFF character to
3321 * Since we use DMA we don't check for info->x_char in transmit_chars_dma(),
3322 * but we do it in handle_ser_tx_interrupt().
3323 * We disable DMA channel and enable tx ready interrupt and write the
3324 * character when possible.
3326 static void rs_send_xchar(struct tty_struct *tty, char ch)
3328 struct e100_serial *info = (struct e100_serial *)tty->driver_data;
3329 unsigned long flags;
3330 local_irq_save(flags);
3331 if (info->uses_dma_out) {
3332 /* Put the DMA on hold and disable the channel */
3333 *info->ocmdadr = IO_STATE(R_DMA_CH6_CMD, cmd, hold);
3334 while (IO_EXTRACT(R_DMA_CH6_CMD, cmd, *info->ocmdadr) !=
3335 IO_STATE_VALUE(R_DMA_CH6_CMD, cmd, hold));
3336 e100_disable_txdma_channel(info);
3339 /* Must make sure transmitter is not stopped before we can transmit */
3343 /* Enable manual transmit interrupt and send from there */
3344 DFLOW(DEBUG_LOG(info->line, "rs_send_xchar 0x%02X\n", ch));
3346 e100_enable_serial_tx_ready_irq(info);
3347 local_irq_restore(flags);
3351 * ------------------------------------------------------------
3354 * This routine is called by the upper-layer tty layer to signal that
3355 * incoming characters should be throttled.
3356 * ------------------------------------------------------------
3359 rs_throttle(struct tty_struct * tty)
3361 struct e100_serial *info = (struct e100_serial *)tty->driver_data;
3362 #ifdef SERIAL_DEBUG_THROTTLE
3365 printk("throttle %s: %lu....\n", tty_name(tty, buf),
3366 (unsigned long)tty->ldisc.chars_in_buffer(tty));
3368 DFLOW(DEBUG_LOG(info->line,"rs_throttle %lu\n", tty->ldisc.chars_in_buffer(tty)));
3370 /* Do RTS before XOFF since XOFF might take some time */
3371 if (tty->termios->c_cflag & CRTSCTS) {
3372 /* Turn off RTS line */
3376 rs_send_xchar(tty, STOP_CHAR(tty));
3381 rs_unthrottle(struct tty_struct * tty)
3383 struct e100_serial *info = (struct e100_serial *)tty->driver_data;
3384 #ifdef SERIAL_DEBUG_THROTTLE
3387 printk("unthrottle %s: %lu....\n", tty_name(tty, buf),
3388 (unsigned long)tty->ldisc.chars_in_buffer(tty));
3390 DFLOW(DEBUG_LOG(info->line,"rs_unthrottle ldisc %d\n", tty->ldisc.chars_in_buffer(tty)));
3391 DFLOW(DEBUG_LOG(info->line,"rs_unthrottle flip.count: %i\n", tty->flip.count));
3392 /* Do RTS before XOFF since XOFF might take some time */
3393 if (tty->termios->c_cflag & CRTSCTS) {
3394 /* Assert RTS line */
3402 rs_send_xchar(tty, START_CHAR(tty));
3408 * ------------------------------------------------------------
3409 * rs_ioctl() and friends
3410 * ------------------------------------------------------------
3414 get_serial_info(struct e100_serial * info,
3415 struct serial_struct * retinfo)
3417 struct serial_struct tmp;
3419 /* this is all probably wrong, there are a lot of fields
3420 * here that we don't have in e100_serial and maybe we
3421 * should set them to something else than 0.
3426 memset(&tmp, 0, sizeof(tmp));
3427 tmp.type = info->type;
3428 tmp.line = info->line;
3429 tmp.port = (int)info->ioport;
3430 tmp.irq = info->irq;
3431 tmp.flags = info->flags;
3432 tmp.baud_base = info->baud_base;
3433 tmp.close_delay = info->close_delay;
3434 tmp.closing_wait = info->closing_wait;
3435 tmp.custom_divisor = info->custom_divisor;
3436 if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
3442 set_serial_info(struct e100_serial *info,
3443 struct serial_struct *new_info)
3445 struct serial_struct new_serial;
3446 struct e100_serial old_info;
3449 if (copy_from_user(&new_serial, new_info, sizeof(new_serial)))
3454 if (!capable(CAP_SYS_ADMIN)) {
3455 if ((new_serial.type != info->type) ||
3456 (new_serial.close_delay != info->close_delay) ||
3457 ((new_serial.flags & ~ASYNC_USR_MASK) !=
3458 (info->flags & ~ASYNC_USR_MASK)))
3460 info->flags = ((info->flags & ~ASYNC_USR_MASK) |
3461 (new_serial.flags & ASYNC_USR_MASK));
3462 goto check_and_exit;
3465 if (info->count > 1)
3469 * OK, past this point, all the error checking has been done.
3470 * At this point, we start making changes.....
3473 info->baud_base = new_serial.baud_base;
3474 info->flags = ((info->flags & ~ASYNC_FLAGS) |
3475 (new_serial.flags & ASYNC_FLAGS));
3476 info->custom_divisor = new_serial.custom_divisor;
3477 info->type = new_serial.type;
3478 info->close_delay = new_serial.close_delay;
3479 info->closing_wait = new_serial.closing_wait;
3480 info->port.tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
3483 if (info->flags & ASYNC_INITIALIZED) {
3486 retval = startup(info);
3491 * get_lsr_info - get line status register info
3493 * Purpose: Let user call ioctl() to get info when the UART physically
3494 * is emptied. On bus types like RS485, the transmitter must
3495 * release the bus after transmitting. This must be done when
3496 * the transmit shift register is empty, not be done when the
3497 * transmit holding register is empty. This functionality
3498 * allows an RS485 driver to be written in user space.
3501 get_lsr_info(struct e100_serial * info, unsigned int *value)
3503 unsigned int result = TIOCSER_TEMT;
3504 #ifndef CONFIG_SVINTO_SIM
3505 unsigned long curr_time = jiffies;
3506 unsigned long curr_time_usec = GET_JIFFIES_USEC();
3507 unsigned long elapsed_usec =
3508 (curr_time - info->last_tx_active) * 1000000/HZ +
3509 curr_time_usec - info->last_tx_active_usec;
3511 if (info->xmit.head != info->xmit.tail ||
3512 elapsed_usec < 2*info->char_time_usec) {
3517 if (copy_to_user(value, &result, sizeof(int)))
3522 #ifdef SERIAL_DEBUG_IO
3529 const struct state_str control_state_str[] = {
3530 {TIOCM_DTR, "DTR" },
3534 {TIOCM_CTS, "CTS" },
3537 {TIOCM_DSR, "DSR" },
3541 char *get_control_state_str(int MLines, char *s)
3546 while (control_state_str[i].str != NULL) {
3547 if (MLines & control_state_str[i].state) {
3551 strcat(s, control_state_str[i].str);
3560 rs_break(struct tty_struct *tty, int break_state)
3562 struct e100_serial *info = (struct e100_serial *)tty->driver_data;
3563 unsigned long flags;
3568 local_irq_save(flags);
3569 if (break_state == -1) {
3570 /* Go to manual mode and set the txd pin to 0 */
3571 /* Clear bit 7 (txd) and 6 (tr_enable) */
3572 info->tx_ctrl &= 0x3F;
3574 /* Set bit 7 (txd) and 6 (tr_enable) */
3575 info->tx_ctrl |= (0x80 | 0x40);
3577 info->ioport[REG_TR_CTRL] = info->tx_ctrl;
3578 local_irq_restore(flags);
3583 rs_tiocmset(struct tty_struct *tty, struct file *file,
3584 unsigned int set, unsigned int clear)
3586 struct e100_serial *info = (struct e100_serial *)tty->driver_data;
3587 unsigned long flags;
3589 local_irq_save(flags);
3591 if (clear & TIOCM_RTS)
3593 if (clear & TIOCM_DTR)
3595 /* Handle FEMALE behaviour */
3596 if (clear & TIOCM_RI)
3597 e100_ri_out(info, 0);
3598 if (clear & TIOCM_CD)
3599 e100_cd_out(info, 0);
3601 if (set & TIOCM_RTS)
3603 if (set & TIOCM_DTR)
3605 /* Handle FEMALE behaviour */
3607 e100_ri_out(info, 1);
3609 e100_cd_out(info, 1);
3611 local_irq_restore(flags);
3616 rs_tiocmget(struct tty_struct *tty, struct file *file)
3618 struct e100_serial *info = (struct e100_serial *)tty->driver_data;
3619 unsigned int result;
3620 unsigned long flags;
3622 local_irq_save(flags);
3625 (!E100_RTS_GET(info) ? TIOCM_RTS : 0)
3626 | (!E100_DTR_GET(info) ? TIOCM_DTR : 0)
3627 | (!E100_RI_GET(info) ? TIOCM_RNG : 0)
3628 | (!E100_DSR_GET(info) ? TIOCM_DSR : 0)
3629 | (!E100_CD_GET(info) ? TIOCM_CAR : 0)
3630 | (!E100_CTS_GET(info) ? TIOCM_CTS : 0);
3632 local_irq_restore(flags);
3634 #ifdef SERIAL_DEBUG_IO
3635 printk(KERN_DEBUG "ser%i: modem state: %i 0x%08X\n",
3636 info->line, result, result);
3640 get_control_state_str(result, s);
3641 printk(KERN_DEBUG "state: %s\n", s);
3650 rs_ioctl(struct tty_struct *tty, struct file * file,
3651 unsigned int cmd, unsigned long arg)
3653 struct e100_serial * info = (struct e100_serial *)tty->driver_data;
3655 if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
3656 (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGWILD) &&
3657 (cmd != TIOCSERSWILD) && (cmd != TIOCSERGSTRUCT)) {
3658 if (tty->flags & (1 << TTY_IO_ERROR))
3664 return get_serial_info(info,
3665 (struct serial_struct *) arg);
3667 return set_serial_info(info,
3668 (struct serial_struct *) arg);
3669 case TIOCSERGETLSR: /* Get line status register */
3670 return get_lsr_info(info, (unsigned int *) arg);
3672 case TIOCSERGSTRUCT:
3673 if (copy_to_user((struct e100_serial *) arg,
3674 info, sizeof(struct e100_serial)))
3678 #if defined(CONFIG_ETRAX_RS485)
3679 case TIOCSERSETRS485:
3681 struct rs485_control rs485ctrl;
3682 if (copy_from_user(&rs485ctrl, (struct rs485_control *)arg,
3686 return e100_enable_rs485(tty, &rs485ctrl);
3689 case TIOCSERWRRS485:
3691 struct rs485_write rs485wr;
3692 if (copy_from_user(&rs485wr, (struct rs485_write *)arg,
3696 return e100_write_rs485(tty, rs485wr.outc, rs485wr.outc_size);
3701 return -ENOIOCTLCMD;
3707 rs_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
3709 struct e100_serial *info = (struct e100_serial *)tty->driver_data;
3713 /* Handle turning off CRTSCTS */
3714 if ((old_termios->c_cflag & CRTSCTS) &&
3715 !(tty->termios->c_cflag & CRTSCTS)) {
3716 tty->hw_stopped = 0;
3723 * ------------------------------------------------------------
3726 * This routine is called when the serial port gets closed. First, we
3727 * wait for the last remaining data to be sent. Then, we unlink its
3728 * S structure from the interrupt chain if necessary, and we free
3729 * that IRQ if nothing is left in the chain.
3730 * ------------------------------------------------------------
3733 rs_close(struct tty_struct *tty, struct file * filp)
3735 struct e100_serial * info = (struct e100_serial *)tty->driver_data;
3736 unsigned long flags;
3741 /* interrupts are disabled for this entire function */
3743 local_irq_save(flags);
3745 if (tty_hung_up_p(filp)) {
3746 local_irq_restore(flags);
3750 #ifdef SERIAL_DEBUG_OPEN
3751 printk("[%d] rs_close ttyS%d, count = %d\n", current->pid,
3752 info->line, info->count);
3754 if ((tty->count == 1) && (info->count != 1)) {
3756 * Uh, oh. tty->count is 1, which means that the tty
3757 * structure will be freed. Info->count should always
3758 * be one in these conditions. If it's greater than
3759 * one, we've got real problems, since it means the
3760 * serial port won't be shutdown.
3763 "rs_close: bad serial port count; tty->count is 1, "
3764 "info->count is %d\n", info->count);
3767 if (--info->count < 0) {
3768 printk(KERN_CRIT "rs_close: bad serial port count for ttyS%d: %d\n",
3769 info->line, info->count);
3773 local_irq_restore(flags);
3776 info->flags |= ASYNC_CLOSING;
3778 * Save the termios structure, since this port may have
3779 * separate termios for callout and dialin.
3781 if (info->flags & ASYNC_NORMAL_ACTIVE)
3782 info->normal_termios = *tty->termios;
3784 * Now we wait for the transmit buffer to clear; and we notify
3785 * the line discipline to only process XON/XOFF characters.
3788 if (info->closing_wait != ASYNC_CLOSING_WAIT_NONE)
3789 tty_wait_until_sent(tty, info->closing_wait);
3791 * At this point we stop accepting input. To do this, we
3792 * disable the serial receiver and the DMA receive interrupt.
3794 #ifdef SERIAL_HANDLE_EARLY_ERRORS
3795 e100_disable_serial_data_irq(info);
3798 #ifndef CONFIG_SVINTO_SIM
3799 e100_disable_rx(info);
3800 e100_disable_rx_irq(info);
3802 if (info->flags & ASYNC_INITIALIZED) {
3804 * Before we drop DTR, make sure the UART transmitter
3805 * has completely drained; this is especially
3806 * important as we have a transmit FIFO!
3808 rs_wait_until_sent(tty, HZ);
3813 rs_flush_buffer(tty);
3814 tty_ldisc_flush(tty);
3817 info->port.tty = NULL;
3818 if (info->blocked_open) {
3819 if (info->close_delay)
3820 schedule_timeout_interruptible(info->close_delay);
3821 wake_up_interruptible(&info->open_wait);
3823 info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
3824 wake_up_interruptible(&info->close_wait);
3825 local_irq_restore(flags);
3829 #if defined(CONFIG_ETRAX_RS485)
3830 if (info->rs485.enabled) {
3831 info->rs485.enabled = 0;
3832 #if defined(CONFIG_ETRAX_RS485_ON_PA)
3833 *R_PORT_PA_DATA = port_pa_data_shadow &= ~(1 << rs485_pa_bit);
3835 #if defined(CONFIG_ETRAX_RS485_ON_PORT_G)
3836 REG_SHADOW_SET(R_PORT_G_DATA, port_g_data_shadow,
3837 rs485_port_g_bit, 0);
3839 #if defined(CONFIG_ETRAX_RS485_LTC1387)
3840 REG_SHADOW_SET(R_PORT_G_DATA, port_g_data_shadow,
3841 CONFIG_ETRAX_RS485_LTC1387_DXEN_PORT_G_BIT, 0);
3842 REG_SHADOW_SET(R_PORT_G_DATA, port_g_data_shadow,
3843 CONFIG_ETRAX_RS485_LTC1387_RXEN_PORT_G_BIT, 0);
3849 * Release any allocated DMA irq's.
3851 if (info->dma_in_enabled) {
3852 free_irq(info->dma_in_irq_nbr, info);
3853 cris_free_dma(info->dma_in_nbr, info->dma_in_irq_description);
3854 info->uses_dma_in = 0;
3855 #ifdef SERIAL_DEBUG_OPEN
3856 printk(KERN_DEBUG "DMA irq '%s' freed\n",
3857 info->dma_in_irq_description);
3860 if (info->dma_out_enabled) {
3861 free_irq(info->dma_out_irq_nbr, info);
3862 cris_free_dma(info->dma_out_nbr, info->dma_out_irq_description);
3863 info->uses_dma_out = 0;
3864 #ifdef SERIAL_DEBUG_OPEN
3865 printk(KERN_DEBUG "DMA irq '%s' freed\n",
3866 info->dma_out_irq_description);
3872 * rs_wait_until_sent() --- wait until the transmitter is empty
3874 static void rs_wait_until_sent(struct tty_struct *tty, int timeout)
3876 unsigned long orig_jiffies;
3877 struct e100_serial *info = (struct e100_serial *)tty->driver_data;
3878 unsigned long curr_time = jiffies;
3879 unsigned long curr_time_usec = GET_JIFFIES_USEC();
3881 (curr_time - info->last_tx_active) * (1000000/HZ) +
3882 curr_time_usec - info->last_tx_active_usec;
3885 * Check R_DMA_CHx_STATUS bit 0-6=number of available bytes in FIFO
3886 * R_DMA_CHx_HWSW bit 31-16=nbr of bytes left in DMA buffer (0=64k)
3889 orig_jiffies = jiffies;
3890 while (info->xmit.head != info->xmit.tail || /* More in send queue */
3891 (*info->ostatusadr & 0x007f) || /* more in FIFO */
3892 (elapsed_usec < 2*info->char_time_usec)) {
3893 schedule_timeout_interruptible(1);
3894 if (signal_pending(current))
3896 if (timeout && time_after(jiffies, orig_jiffies + timeout))
3898 curr_time = jiffies;
3899 curr_time_usec = GET_JIFFIES_USEC();
3901 (curr_time - info->last_tx_active) * (1000000/HZ) +
3902 curr_time_usec - info->last_tx_active_usec;
3904 set_current_state(TASK_RUNNING);
3909 * rs_hangup() --- called by tty_hangup() when a hangup is signaled.
3912 rs_hangup(struct tty_struct *tty)
3914 struct e100_serial * info = (struct e100_serial *)tty->driver_data;
3916 rs_flush_buffer(tty);
3920 info->flags &= ~ASYNC_NORMAL_ACTIVE;
3921 info->port.tty = NULL;
3922 wake_up_interruptible(&info->open_wait);
3926 * ------------------------------------------------------------
3927 * rs_open() and friends
3928 * ------------------------------------------------------------
3931 block_til_ready(struct tty_struct *tty, struct file * filp,
3932 struct e100_serial *info)
3934 DECLARE_WAITQUEUE(wait, current);
3935 unsigned long flags;
3937 int do_clocal = 0, extra_count = 0;
3940 * If the device is in the middle of being closed, then block
3941 * until it's done, and then try again.
3943 if (tty_hung_up_p(filp) ||
3944 (info->flags & ASYNC_CLOSING)) {
3945 wait_event_interruptible(info->close_wait,
3946 !(info->flags & ASYNC_CLOSING));
3947 #ifdef SERIAL_DO_RESTART
3948 if (info->flags & ASYNC_HUP_NOTIFY)
3951 return -ERESTARTSYS;
3958 * If non-blocking mode is set, or the port is not enabled,
3959 * then make the check up front and then exit.
3961 if ((filp->f_flags & O_NONBLOCK) ||
3962 (tty->flags & (1 << TTY_IO_ERROR))) {
3963 info->flags |= ASYNC_NORMAL_ACTIVE;
3967 if (tty->termios->c_cflag & CLOCAL) {
3972 * Block waiting for the carrier detect and the line to become
3973 * free (i.e., not in use by the callout). While we are in
3974 * this loop, info->count is dropped by one, so that
3975 * rs_close() knows when to free things. We restore it upon
3976 * exit, either normal or abnormal.
3979 add_wait_queue(&info->open_wait, &wait);
3980 #ifdef SERIAL_DEBUG_OPEN
3981 printk("block_til_ready before block: ttyS%d, count = %d\n",
3982 info->line, info->count);
3984 local_irq_save(flags);
3985 if (!tty_hung_up_p(filp)) {
3989 local_irq_restore(flags);
3990 info->blocked_open++;
3992 local_irq_save(flags);
3993 /* assert RTS and DTR */
3996 local_irq_restore(flags);
3997 set_current_state(TASK_INTERRUPTIBLE);
3998 if (tty_hung_up_p(filp) ||
3999 !(info->flags & ASYNC_INITIALIZED)) {
4000 #ifdef SERIAL_DO_RESTART
4001 if (info->flags & ASYNC_HUP_NOTIFY)
4004 retval = -ERESTARTSYS;
4010 if (!(info->flags & ASYNC_CLOSING) && do_clocal)
4011 /* && (do_clocal || DCD_IS_ASSERTED) */
4013 if (signal_pending(current)) {
4014 retval = -ERESTARTSYS;
4017 #ifdef SERIAL_DEBUG_OPEN
4018 printk("block_til_ready blocking: ttyS%d, count = %d\n",
4019 info->line, info->count);
4023 set_current_state(TASK_RUNNING);
4024 remove_wait_queue(&info->open_wait, &wait);
4027 info->blocked_open--;
4028 #ifdef SERIAL_DEBUG_OPEN
4029 printk("block_til_ready after blocking: ttyS%d, count = %d\n",
4030 info->line, info->count);
4034 info->flags |= ASYNC_NORMAL_ACTIVE;
4039 deinit_port(struct e100_serial *info)
4041 if (info->dma_out_enabled) {
4042 cris_free_dma(info->dma_out_nbr, info->dma_out_irq_description);
4043 free_irq(info->dma_out_irq_nbr, info);
4045 if (info->dma_in_enabled) {
4046 cris_free_dma(info->dma_in_nbr, info->dma_in_irq_description);
4047 free_irq(info->dma_in_irq_nbr, info);
4052 * This routine is called whenever a serial port is opened.
4053 * It performs the serial-specific initialization for the tty structure.
4056 rs_open(struct tty_struct *tty, struct file * filp)
4058 struct e100_serial *info;
4061 int allocated_resources = 0;
4063 /* find which port we want to open */
4066 if (line < 0 || line >= NR_PORTS)
4069 /* find the corresponding e100_serial struct in the table */
4070 info = rs_table + line;
4072 /* don't allow the opening of ports that are not enabled in the HW config */
4076 #ifdef SERIAL_DEBUG_OPEN
4077 printk("[%d] rs_open %s, count = %d\n", current->pid, tty->name,
4082 tty->driver_data = info;
4083 info->port.tty = tty;
4085 info->port.tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
4088 page = get_zeroed_page(GFP_KERNEL);
4095 tmp_buf = (unsigned char *) page;
4099 * If the port is in the middle of closing, bail out now
4101 if (tty_hung_up_p(filp) ||
4102 (info->flags & ASYNC_CLOSING)) {
4103 wait_event_interruptible(info->close_wait,
4104 !(info->flags & ASYNC_CLOSING));
4105 #ifdef SERIAL_DO_RESTART
4106 return ((info->flags & ASYNC_HUP_NOTIFY) ?
4107 -EAGAIN : -ERESTARTSYS);
4114 * If DMA is enabled try to allocate the irq's.
4116 if (info->count == 1) {
4117 allocated_resources = 1;
4118 if (info->dma_in_enabled) {
4119 if (request_irq(info->dma_in_irq_nbr,
4121 info->dma_in_irq_flags,
4122 info->dma_in_irq_description,
4124 printk(KERN_WARNING "DMA irq '%s' busy; "
4125 "falling back to non-DMA mode\n",
4126 info->dma_in_irq_description);
4127 /* Make sure we never try to use DMA in */
4128 /* for the port again. */
4129 info->dma_in_enabled = 0;
4130 } else if (cris_request_dma(info->dma_in_nbr,
4131 info->dma_in_irq_description,
4132 DMA_VERBOSE_ON_ERROR,
4134 free_irq(info->dma_in_irq_nbr, info);
4135 printk(KERN_WARNING "DMA '%s' busy; "
4136 "falling back to non-DMA mode\n",
4137 info->dma_in_irq_description);
4138 /* Make sure we never try to use DMA in */
4139 /* for the port again. */
4140 info->dma_in_enabled = 0;
4142 #ifdef SERIAL_DEBUG_OPEN
4144 printk(KERN_DEBUG "DMA irq '%s' allocated\n",
4145 info->dma_in_irq_description);
4148 if (info->dma_out_enabled) {
4149 if (request_irq(info->dma_out_irq_nbr,
4151 info->dma_out_irq_flags,
4152 info->dma_out_irq_description,
4154 printk(KERN_WARNING "DMA irq '%s' busy; "
4155 "falling back to non-DMA mode\n",
4156 info->dma_out_irq_description);
4157 /* Make sure we never try to use DMA out */
4158 /* for the port again. */
4159 info->dma_out_enabled = 0;
4160 } else if (cris_request_dma(info->dma_out_nbr,
4161 info->dma_out_irq_description,
4162 DMA_VERBOSE_ON_ERROR,
4164 free_irq(info->dma_out_irq_nbr, info);
4165 printk(KERN_WARNING "DMA '%s' busy; "
4166 "falling back to non-DMA mode\n",
4167 info->dma_out_irq_description);
4168 /* Make sure we never try to use DMA out */
4169 /* for the port again. */
4170 info->dma_out_enabled = 0;
4172 #ifdef SERIAL_DEBUG_OPEN
4174 printk(KERN_DEBUG "DMA irq '%s' allocated\n",
4175 info->dma_out_irq_description);
4181 * Start up the serial port
4184 retval = startup(info);
4186 if (allocated_resources)
4189 /* FIXME Decrease count info->count here too? */
4194 retval = block_til_ready(tty, filp, info);
4196 #ifdef SERIAL_DEBUG_OPEN
4197 printk("rs_open returning after block_til_ready with %d\n",
4200 if (allocated_resources)
4206 if ((info->count == 1) && (info->flags & ASYNC_SPLIT_TERMIOS)) {
4207 *tty->termios = info->normal_termios;
4211 #ifdef SERIAL_DEBUG_OPEN
4212 printk("rs_open ttyS%d successful...\n", info->line);
4214 DLOG_INT_TRIG( log_int_pos = 0);
4216 DFLIP( if (info->line == SERIAL_DEBUG_LINE) {
4217 info->icount.rx = 0;
4224 * /proc fs routines....
4227 static int line_info(char *buf, struct e100_serial *info)
4233 ret = sprintf(buf, "%d: uart:E100 port:%lX irq:%d",
4234 info->line, (unsigned long)info->ioport, info->irq);
4236 if (!info->ioport || (info->type == PORT_UNKNOWN)) {
4237 ret += sprintf(buf+ret, "\n");
4243 if (!E100_RTS_GET(info))
4244 strcat(stat_buf, "|RTS");
4245 if (!E100_CTS_GET(info))
4246 strcat(stat_buf, "|CTS");
4247 if (!E100_DTR_GET(info))
4248 strcat(stat_buf, "|DTR");
4249 if (!E100_DSR_GET(info))
4250 strcat(stat_buf, "|DSR");
4251 if (!E100_CD_GET(info))
4252 strcat(stat_buf, "|CD");
4253 if (!E100_RI_GET(info))
4254 strcat(stat_buf, "|RI");
4256 ret += sprintf(buf+ret, " baud:%d", info->baud);
4258 ret += sprintf(buf+ret, " tx:%lu rx:%lu",
4259 (unsigned long)info->icount.tx,
4260 (unsigned long)info->icount.rx);
4261 tmp = CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
4263 ret += sprintf(buf+ret, " tx_pend:%lu/%lu",
4265 (unsigned long)SERIAL_XMIT_SIZE);
4268 ret += sprintf(buf+ret, " rx_pend:%lu/%lu",
4269 (unsigned long)info->recv_cnt,
4270 (unsigned long)info->max_recv_cnt);
4273 if (info->port.tty) {
4275 if (info->port.tty->stopped)
4276 ret += sprintf(buf+ret, " stopped:%i",
4277 (int)info->port.tty->stopped);
4278 if (info->port.tty->hw_stopped)
4279 ret += sprintf(buf+ret, " hw_stopped:%i",
4280 (int)info->port.tty->hw_stopped);
4284 unsigned char rstat = info->ioport[REG_STATUS];
4285 if (rstat & IO_MASK(R_SERIAL0_STATUS, xoff_detect) )
4286 ret += sprintf(buf+ret, " xoff_detect:1");
4294 if (info->icount.frame)
4295 ret += sprintf(buf+ret, " fe:%lu",
4296 (unsigned long)info->icount.frame);
4298 if (info->icount.parity)
4299 ret += sprintf(buf+ret, " pe:%lu",
4300 (unsigned long)info->icount.parity);
4302 if (info->icount.brk)
4303 ret += sprintf(buf+ret, " brk:%lu",
4304 (unsigned long)info->icount.brk);
4306 if (info->icount.overrun)
4307 ret += sprintf(buf+ret, " oe:%lu",
4308 (unsigned long)info->icount.overrun);
4311 * Last thing is the RS-232 status lines
4313 ret += sprintf(buf+ret, " %s\n", stat_buf+1);
4317 int rs_read_proc(char *page, char **start, off_t off, int count,
4318 int *eof, void *data)
4323 len += sprintf(page, "serinfo:1.0 driver:%s\n",
4325 for (i = 0; i < NR_PORTS && len < 4000; i++) {
4326 if (!rs_table[i].enabled)
4328 l = line_info(page + len, &rs_table[i]);
4330 if (len+begin > off+count)
4332 if (len+begin < off) {
4337 #ifdef DEBUG_LOG_INCLUDED
4338 for (i = 0; i < debug_log_pos; i++) {
4339 len += sprintf(page + len, "%-4i %lu.%lu ", i, debug_log[i].time, timer_data_to_ns(debug_log[i].timer_data));
4340 len += sprintf(page + len, debug_log[i].string, debug_log[i].value);
4341 if (len+begin > off+count)
4343 if (len+begin < off) {
4348 len += sprintf(page + len, "debug_log %i/%i %li bytes\n",
4349 i, DEBUG_LOG_SIZE, begin+len);
4355 if (off >= len+begin)
4357 *start = page + (off-begin);
4358 return ((count < begin+len-off) ? count : begin+len-off);
4361 /* Finally, routines used to initialize the serial driver. */
4364 show_serial_version(void)
4367 "ETRAX 100LX serial-driver %s, (c) 2000-2004 Axis Communications AB\r\n",
4368 &serial_version[11]); /* "$Revision: x.yy" */
4371 /* rs_init inits the driver at boot (using the module_init chain) */
4373 static const struct tty_operations rs_ops = {
4377 .flush_chars = rs_flush_chars,
4378 .write_room = rs_write_room,
4379 .chars_in_buffer = rs_chars_in_buffer,
4380 .flush_buffer = rs_flush_buffer,
4382 .throttle = rs_throttle,
4383 .unthrottle = rs_unthrottle,
4384 .set_termios = rs_set_termios,
4387 .hangup = rs_hangup,
4388 .break_ctl = rs_break,
4389 .send_xchar = rs_send_xchar,
4390 .wait_until_sent = rs_wait_until_sent,
4391 .read_proc = rs_read_proc,
4392 .tiocmget = rs_tiocmget,
4393 .tiocmset = rs_tiocmset
4400 struct e100_serial *info;
4401 struct tty_driver *driver = alloc_tty_driver(NR_PORTS);
4406 show_serial_version();
4408 /* Setup the timed flush handler system */
4410 #if !defined(CONFIG_ETRAX_SERIAL_FAST_TIMER)
4411 setup_timer(&flush_timer, timed_flush_handler, 0);
4412 mod_timer(&flush_timer, jiffies + 5);
4415 #if defined(CONFIG_ETRAX_RS485)
4416 #if defined(CONFIG_ETRAX_RS485_ON_PA)
4417 if (cris_io_interface_allocate_pins(if_ser0, 'a', rs485_pa_bit,
4419 printk(KERN_CRIT "ETRAX100LX serial: Could not allocate "
4421 put_tty_driver(driver);
4425 #if defined(CONFIG_ETRAX_RS485_ON_PORT_G)
4426 if (cris_io_interface_allocate_pins(if_ser0, 'g', rs485_pa_bit,
4427 rs485_port_g_bit)) {
4428 printk(KERN_CRIT "ETRAX100LX serial: Could not allocate "
4430 put_tty_driver(driver);
4436 /* Initialize the tty_driver structure */
4438 driver->driver_name = "serial";
4439 driver->name = "ttyS";
4440 driver->major = TTY_MAJOR;
4441 driver->minor_start = 64;
4442 driver->type = TTY_DRIVER_TYPE_SERIAL;
4443 driver->subtype = SERIAL_TYPE_NORMAL;
4444 driver->init_termios = tty_std_termios;
4445 driver->init_termios.c_cflag =
4446 B115200 | CS8 | CREAD | HUPCL | CLOCAL; /* is normally B9600 default... */
4447 driver->init_termios.c_ispeed = 115200;
4448 driver->init_termios.c_ospeed = 115200;
4449 driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
4451 tty_set_operations(driver, &rs_ops);
4452 serial_driver = driver;
4453 if (tty_register_driver(driver))
4454 panic("Couldn't register serial driver\n");
4455 /* do some initializing for the separate ports */
4457 for (i = 0, info = rs_table; i < NR_PORTS; i++,info++) {
4458 if (info->enabled) {
4459 if (cris_request_io_interface(info->io_if,
4460 info->io_if_description)) {
4461 printk(KERN_CRIT "ETRAX100LX async serial: "
4462 "Could not allocate IO pins for "
4464 info->io_if_description, i);
4468 info->uses_dma_in = 0;
4469 info->uses_dma_out = 0;
4471 info->port.tty = NULL;
4472 info->type = PORT_ETRAX;
4473 info->tr_running = 0;
4474 info->forced_eop = 0;
4475 info->baud_base = DEF_BAUD_BASE;
4476 info->custom_divisor = 0;
4478 info->close_delay = 5*HZ/10;
4479 info->closing_wait = 30*HZ;
4483 info->blocked_open = 0;
4484 info->normal_termios = driver->init_termios;
4485 init_waitqueue_head(&info->open_wait);
4486 init_waitqueue_head(&info->close_wait);
4487 info->xmit.buf = NULL;
4488 info->xmit.tail = info->xmit.head = 0;
4489 info->first_recv_buffer = info->last_recv_buffer = NULL;
4490 info->recv_cnt = info->max_recv_cnt = 0;
4491 info->last_tx_active_usec = 0;
4492 info->last_tx_active = 0;
4494 #if defined(CONFIG_ETRAX_RS485)
4495 /* Set sane defaults */
4496 info->rs485.rts_on_send = 0;
4497 info->rs485.rts_after_sent = 1;
4498 info->rs485.delay_rts_before_send = 0;
4499 info->rs485.enabled = 0;
4501 INIT_WORK(&info->work, do_softint);
4503 if (info->enabled) {
4504 printk(KERN_INFO "%s%d at 0x%x is a builtin UART with DMA\n",
4505 serial_driver->name, info->line, (unsigned int)info->ioport);
4508 #ifdef CONFIG_ETRAX_FAST_TIMER
4509 #ifdef CONFIG_ETRAX_SERIAL_FAST_TIMER
4510 memset(fast_timers, 0, sizeof(fast_timers));
4512 #ifdef CONFIG_ETRAX_RS485
4513 memset(fast_timers_rs485, 0, sizeof(fast_timers_rs485));
4518 #ifndef CONFIG_SVINTO_SIM
4519 #ifndef CONFIG_ETRAX_KGDB
4520 /* Not needed in simulator. May only complicate stuff. */
4521 /* hook the irq's for DMA channel 6 and 7, serial output and input, and some more... */
4523 if (request_irq(SERIAL_IRQ_NBR, ser_interrupt,
4524 IRQF_SHARED | IRQF_DISABLED, "serial ", driver))
4525 panic("%s: Failed to request irq8", __func__);
4528 #endif /* CONFIG_SVINTO_SIM */
4533 /* this makes sure that rs_init is called during kernel boot */
4535 module_init(rs_init);