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 <asm/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 <asm/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 .port = (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 .port = (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 .port = (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 .port = (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 static struct ktermios *serial_termios_locked[NR_PORTS];
461 #ifdef CONFIG_ETRAX_SERIAL_FAST_TIMER
462 static struct fast_timer fast_timers[NR_PORTS];
465 #ifdef CONFIG_ETRAX_SERIAL_PROC_ENTRY
466 #define PROCSTAT(x) x
467 struct ser_statistics_type {
469 int early_errors_cnt;
472 unsigned long int processing_flip;
473 unsigned long processing_flip_still_room;
474 unsigned long int timeout_flush_cnt;
481 static struct ser_statistics_type ser_stat[NR_PORTS];
487 #endif /* CONFIG_ETRAX_SERIAL_PROC_ENTRY */
490 #if defined(CONFIG_ETRAX_RS485)
491 #ifdef CONFIG_ETRAX_FAST_TIMER
492 static struct fast_timer fast_timers_rs485[NR_PORTS];
494 #if defined(CONFIG_ETRAX_RS485_ON_PA)
495 static int rs485_pa_bit = CONFIG_ETRAX_RS485_ON_PA_BIT;
497 #if defined(CONFIG_ETRAX_RS485_ON_PORT_G)
498 static int rs485_port_g_bit = CONFIG_ETRAX_RS485_ON_PORT_G_BIT;
502 /* Info and macros needed for each ports extra control/status signals. */
503 #define E100_STRUCT_PORT(line, pinname) \
504 ((CONFIG_ETRAX_SER##line##_##pinname##_ON_PA_BIT >= 0)? \
505 (R_PORT_PA_DATA): ( \
506 (CONFIG_ETRAX_SER##line##_##pinname##_ON_PB_BIT >= 0)? \
507 (R_PORT_PB_DATA):&dummy_ser[line]))
509 #define E100_STRUCT_SHADOW(line, pinname) \
510 ((CONFIG_ETRAX_SER##line##_##pinname##_ON_PA_BIT >= 0)? \
511 (&port_pa_data_shadow): ( \
512 (CONFIG_ETRAX_SER##line##_##pinname##_ON_PB_BIT >= 0)? \
513 (&port_pb_data_shadow):&dummy_ser[line]))
514 #define E100_STRUCT_MASK(line, pinname) \
515 ((CONFIG_ETRAX_SER##line##_##pinname##_ON_PA_BIT >= 0)? \
516 (1<<CONFIG_ETRAX_SER##line##_##pinname##_ON_PA_BIT): ( \
517 (CONFIG_ETRAX_SER##line##_##pinname##_ON_PB_BIT >= 0)? \
518 (1<<CONFIG_ETRAX_SER##line##_##pinname##_ON_PB_BIT):DUMMY_##pinname##_MASK))
520 #define DUMMY_DTR_MASK 1
521 #define DUMMY_RI_MASK 2
522 #define DUMMY_DSR_MASK 4
523 #define DUMMY_CD_MASK 8
524 static unsigned char dummy_ser[NR_PORTS] = {0xFF, 0xFF, 0xFF,0xFF};
526 /* If not all status pins are used or disabled, use mixed mode */
527 #ifdef CONFIG_ETRAX_SERIAL_PORT0
529 #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)
531 #if SER0_PA_BITSUM != -4
532 # if CONFIG_ETRAX_SER0_DTR_ON_PA_BIT == -1
533 # ifndef CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED
534 # define CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED 1
537 # if CONFIG_ETRAX_SER0_RI_ON_PA_BIT == -1
538 # ifndef CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED
539 # define CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED 1
542 # if CONFIG_ETRAX_SER0_DSR_ON_PA_BIT == -1
543 # ifndef CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED
544 # define CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED 1
547 # if CONFIG_ETRAX_SER0_CD_ON_PA_BIT == -1
548 # ifndef CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED
549 # define CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED 1
554 #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)
556 #if SER0_PB_BITSUM != -4
557 # if CONFIG_ETRAX_SER0_DTR_ON_PB_BIT == -1
558 # ifndef CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED
559 # define CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED 1
562 # if CONFIG_ETRAX_SER0_RI_ON_PB_BIT == -1
563 # ifndef CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED
564 # define CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED 1
567 # if CONFIG_ETRAX_SER0_DSR_ON_PB_BIT == -1
568 # ifndef CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED
569 # define CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED 1
572 # if CONFIG_ETRAX_SER0_CD_ON_PB_BIT == -1
573 # ifndef CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED
574 # define CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED 1
582 #ifdef CONFIG_ETRAX_SERIAL_PORT1
584 #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)
586 #if SER1_PA_BITSUM != -4
587 # if CONFIG_ETRAX_SER1_DTR_ON_PA_BIT == -1
588 # ifndef CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED
589 # define CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED 1
592 # if CONFIG_ETRAX_SER1_RI_ON_PA_BIT == -1
593 # ifndef CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED
594 # define CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED 1
597 # if CONFIG_ETRAX_SER1_DSR_ON_PA_BIT == -1
598 # ifndef CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED
599 # define CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED 1
602 # if CONFIG_ETRAX_SER1_CD_ON_PA_BIT == -1
603 # ifndef CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED
604 # define CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED 1
609 #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)
611 #if SER1_PB_BITSUM != -4
612 # if CONFIG_ETRAX_SER1_DTR_ON_PB_BIT == -1
613 # ifndef CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED
614 # define CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED 1
617 # if CONFIG_ETRAX_SER1_RI_ON_PB_BIT == -1
618 # ifndef CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED
619 # define CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED 1
622 # if CONFIG_ETRAX_SER1_DSR_ON_PB_BIT == -1
623 # ifndef CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED
624 # define CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED 1
627 # if CONFIG_ETRAX_SER1_CD_ON_PB_BIT == -1
628 # ifndef CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED
629 # define CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED 1
636 #ifdef CONFIG_ETRAX_SERIAL_PORT2
638 #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)
640 #if SER2_PA_BITSUM != -4
641 # if CONFIG_ETRAX_SER2_DTR_ON_PA_BIT == -1
642 # ifndef CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED
643 # define CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED 1
646 # if CONFIG_ETRAX_SER2_RI_ON_PA_BIT == -1
647 # ifndef CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED
648 # define CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED 1
651 # if CONFIG_ETRAX_SER2_DSR_ON_PA_BIT == -1
652 # ifndef CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED
653 # define CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED 1
656 # if CONFIG_ETRAX_SER2_CD_ON_PA_BIT == -1
657 # ifndef CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED
658 # define CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED 1
663 #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)
665 #if SER2_PB_BITSUM != -4
666 # if CONFIG_ETRAX_SER2_DTR_ON_PB_BIT == -1
667 # ifndef CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED
668 # define CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED 1
671 # if CONFIG_ETRAX_SER2_RI_ON_PB_BIT == -1
672 # ifndef CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED
673 # define CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED 1
676 # if CONFIG_ETRAX_SER2_DSR_ON_PB_BIT == -1
677 # ifndef CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED
678 # define CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED 1
681 # if CONFIG_ETRAX_SER2_CD_ON_PB_BIT == -1
682 # ifndef CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED
683 # define CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED 1
690 #ifdef CONFIG_ETRAX_SERIAL_PORT3
692 #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)
694 #if SER3_PA_BITSUM != -4
695 # if CONFIG_ETRAX_SER3_DTR_ON_PA_BIT == -1
696 # ifndef CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED
697 # define CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED 1
700 # if CONFIG_ETRAX_SER3_RI_ON_PA_BIT == -1
701 # ifndef CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED
702 # define CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED 1
705 # if CONFIG_ETRAX_SER3_DSR_ON_PA_BIT == -1
706 # ifndef CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED
707 # define CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED 1
710 # if CONFIG_ETRAX_SER3_CD_ON_PA_BIT == -1
711 # ifndef CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED
712 # define CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED 1
717 #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)
719 #if SER3_PB_BITSUM != -4
720 # if CONFIG_ETRAX_SER3_DTR_ON_PB_BIT == -1
721 # ifndef CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED
722 # define CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED 1
725 # if CONFIG_ETRAX_SER3_RI_ON_PB_BIT == -1
726 # ifndef CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED
727 # define CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED 1
730 # if CONFIG_ETRAX_SER3_DSR_ON_PB_BIT == -1
731 # ifndef CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED
732 # define CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED 1
735 # if CONFIG_ETRAX_SER3_CD_ON_PB_BIT == -1
736 # ifndef CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED
737 # define CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED 1
745 #if defined(CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED) || \
746 defined(CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED) || \
747 defined(CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED) || \
748 defined(CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED)
749 #define CONFIG_ETRAX_SERX_DTR_RI_DSR_CD_MIXED
752 #ifdef CONFIG_ETRAX_SERX_DTR_RI_DSR_CD_MIXED
753 /* The pins can be mixed on PA and PB */
754 #define CONTROL_PINS_PORT_NOT_USED(line) \
755 &dummy_ser[line], &dummy_ser[line], \
756 &dummy_ser[line], &dummy_ser[line], \
757 &dummy_ser[line], &dummy_ser[line], \
758 &dummy_ser[line], &dummy_ser[line], \
759 DUMMY_DTR_MASK, DUMMY_RI_MASK, DUMMY_DSR_MASK, DUMMY_CD_MASK
764 volatile unsigned char *dtr_port;
765 unsigned char *dtr_shadow;
766 volatile unsigned char *ri_port;
767 unsigned char *ri_shadow;
768 volatile unsigned char *dsr_port;
769 unsigned char *dsr_shadow;
770 volatile unsigned char *cd_port;
771 unsigned char *cd_shadow;
773 unsigned char dtr_mask;
774 unsigned char ri_mask;
775 unsigned char dsr_mask;
776 unsigned char cd_mask;
779 static const struct control_pins e100_modem_pins[NR_PORTS] =
783 #ifdef CONFIG_ETRAX_SERIAL_PORT0
784 E100_STRUCT_PORT(0,DTR), E100_STRUCT_SHADOW(0,DTR),
785 E100_STRUCT_PORT(0,RI), E100_STRUCT_SHADOW(0,RI),
786 E100_STRUCT_PORT(0,DSR), E100_STRUCT_SHADOW(0,DSR),
787 E100_STRUCT_PORT(0,CD), E100_STRUCT_SHADOW(0,CD),
788 E100_STRUCT_MASK(0,DTR),
789 E100_STRUCT_MASK(0,RI),
790 E100_STRUCT_MASK(0,DSR),
791 E100_STRUCT_MASK(0,CD)
793 CONTROL_PINS_PORT_NOT_USED(0)
799 #ifdef CONFIG_ETRAX_SERIAL_PORT1
800 E100_STRUCT_PORT(1,DTR), E100_STRUCT_SHADOW(1,DTR),
801 E100_STRUCT_PORT(1,RI), E100_STRUCT_SHADOW(1,RI),
802 E100_STRUCT_PORT(1,DSR), E100_STRUCT_SHADOW(1,DSR),
803 E100_STRUCT_PORT(1,CD), E100_STRUCT_SHADOW(1,CD),
804 E100_STRUCT_MASK(1,DTR),
805 E100_STRUCT_MASK(1,RI),
806 E100_STRUCT_MASK(1,DSR),
807 E100_STRUCT_MASK(1,CD)
809 CONTROL_PINS_PORT_NOT_USED(1)
815 #ifdef CONFIG_ETRAX_SERIAL_PORT2
816 E100_STRUCT_PORT(2,DTR), E100_STRUCT_SHADOW(2,DTR),
817 E100_STRUCT_PORT(2,RI), E100_STRUCT_SHADOW(2,RI),
818 E100_STRUCT_PORT(2,DSR), E100_STRUCT_SHADOW(2,DSR),
819 E100_STRUCT_PORT(2,CD), E100_STRUCT_SHADOW(2,CD),
820 E100_STRUCT_MASK(2,DTR),
821 E100_STRUCT_MASK(2,RI),
822 E100_STRUCT_MASK(2,DSR),
823 E100_STRUCT_MASK(2,CD)
825 CONTROL_PINS_PORT_NOT_USED(2)
831 #ifdef CONFIG_ETRAX_SERIAL_PORT3
832 E100_STRUCT_PORT(3,DTR), E100_STRUCT_SHADOW(3,DTR),
833 E100_STRUCT_PORT(3,RI), E100_STRUCT_SHADOW(3,RI),
834 E100_STRUCT_PORT(3,DSR), E100_STRUCT_SHADOW(3,DSR),
835 E100_STRUCT_PORT(3,CD), E100_STRUCT_SHADOW(3,CD),
836 E100_STRUCT_MASK(3,DTR),
837 E100_STRUCT_MASK(3,RI),
838 E100_STRUCT_MASK(3,DSR),
839 E100_STRUCT_MASK(3,CD)
841 CONTROL_PINS_PORT_NOT_USED(3)
845 #else /* CONFIG_ETRAX_SERX_DTR_RI_DSR_CD_MIXED */
847 /* All pins are on either PA or PB for each serial port */
848 #define CONTROL_PINS_PORT_NOT_USED(line) \
849 &dummy_ser[line], &dummy_ser[line], \
850 DUMMY_DTR_MASK, DUMMY_RI_MASK, DUMMY_DSR_MASK, DUMMY_CD_MASK
855 volatile unsigned char *port;
856 unsigned char *shadow;
858 unsigned char dtr_mask;
859 unsigned char ri_mask;
860 unsigned char dsr_mask;
861 unsigned char cd_mask;
864 #define dtr_port port
865 #define dtr_shadow shadow
867 #define ri_shadow shadow
868 #define dsr_port port
869 #define dsr_shadow shadow
871 #define cd_shadow shadow
873 static const struct control_pins e100_modem_pins[NR_PORTS] =
877 #ifdef CONFIG_ETRAX_SERIAL_PORT0
878 E100_STRUCT_PORT(0,DTR), E100_STRUCT_SHADOW(0,DTR),
879 E100_STRUCT_MASK(0,DTR),
880 E100_STRUCT_MASK(0,RI),
881 E100_STRUCT_MASK(0,DSR),
882 E100_STRUCT_MASK(0,CD)
884 CONTROL_PINS_PORT_NOT_USED(0)
890 #ifdef CONFIG_ETRAX_SERIAL_PORT1
891 E100_STRUCT_PORT(1,DTR), E100_STRUCT_SHADOW(1,DTR),
892 E100_STRUCT_MASK(1,DTR),
893 E100_STRUCT_MASK(1,RI),
894 E100_STRUCT_MASK(1,DSR),
895 E100_STRUCT_MASK(1,CD)
897 CONTROL_PINS_PORT_NOT_USED(1)
903 #ifdef CONFIG_ETRAX_SERIAL_PORT2
904 E100_STRUCT_PORT(2,DTR), E100_STRUCT_SHADOW(2,DTR),
905 E100_STRUCT_MASK(2,DTR),
906 E100_STRUCT_MASK(2,RI),
907 E100_STRUCT_MASK(2,DSR),
908 E100_STRUCT_MASK(2,CD)
910 CONTROL_PINS_PORT_NOT_USED(2)
916 #ifdef CONFIG_ETRAX_SERIAL_PORT3
917 E100_STRUCT_PORT(3,DTR), E100_STRUCT_SHADOW(3,DTR),
918 E100_STRUCT_MASK(3,DTR),
919 E100_STRUCT_MASK(3,RI),
920 E100_STRUCT_MASK(3,DSR),
921 E100_STRUCT_MASK(3,CD)
923 CONTROL_PINS_PORT_NOT_USED(3)
927 #endif /* !CONFIG_ETRAX_SERX_DTR_RI_DSR_CD_MIXED */
929 #define E100_RTS_MASK 0x20
930 #define E100_CTS_MASK 0x40
932 /* All serial port signals are active low:
933 * active = 0 -> 3.3V to RS-232 driver -> -12V on RS-232 level
934 * inactive = 1 -> 0V to RS-232 driver -> +12V on RS-232 level
936 * These macros returns the pin value: 0=0V, >=1 = 3.3V on ETRAX chip
940 #define E100_RTS_GET(info) ((info)->rx_ctrl & E100_RTS_MASK)
942 #define E100_CTS_GET(info) ((info)->port[REG_STATUS] & E100_CTS_MASK)
944 /* These are typically PA or PB and 0 means 0V, 1 means 3.3V */
946 #define E100_DTR_GET(info) ((*e100_modem_pins[(info)->line].dtr_shadow) & e100_modem_pins[(info)->line].dtr_mask)
948 /* Normally inputs */
949 #define E100_RI_GET(info) ((*e100_modem_pins[(info)->line].ri_port) & e100_modem_pins[(info)->line].ri_mask)
950 #define E100_CD_GET(info) ((*e100_modem_pins[(info)->line].cd_port) & e100_modem_pins[(info)->line].cd_mask)
953 #define E100_DSR_GET(info) ((*e100_modem_pins[(info)->line].dsr_port) & e100_modem_pins[(info)->line].dsr_mask)
957 * tmp_buf is used as a temporary buffer by serial_write. We need to
958 * lock it in case the memcpy_fromfs blocks while swapping in a page,
959 * and some other program tries to do a serial write at the same time.
960 * Since the lock will only come under contention when the system is
961 * swapping and available memory is low, it makes sense to share one
962 * buffer across all the serial ports, since it significantly saves
963 * memory if large numbers of serial ports are open.
965 static unsigned char *tmp_buf;
966 static DEFINE_MUTEX(tmp_buf_mutex);
968 /* Calculate the chartime depending on baudrate, numbor of bits etc. */
969 static void update_char_time(struct e100_serial * info)
971 tcflag_t cflags = info->tty->termios->c_cflag;
974 /* calc. number of bits / data byte */
975 /* databits + startbit and 1 stopbit */
976 if ((cflags & CSIZE) == CS7)
981 if (cflags & CSTOPB) /* 2 stopbits ? */
984 if (cflags & PARENB) /* parity bit ? */
988 info->char_time_usec = ((bits * 1000000) / info->baud) + 1;
989 info->flush_time_usec = 4*info->char_time_usec;
990 if (info->flush_time_usec < MIN_FLUSH_TIME_USEC)
991 info->flush_time_usec = MIN_FLUSH_TIME_USEC;
996 * This function maps from the Bxxxx defines in asm/termbits.h into real
1001 cflag_to_baud(unsigned int cflag)
1003 static int baud_table[] = {
1004 0, 50, 75, 110, 134, 150, 200, 300, 600, 1200, 1800, 2400,
1005 4800, 9600, 19200, 38400 };
1007 static int ext_baud_table[] = {
1008 0, 57600, 115200, 230400, 460800, 921600, 1843200, 6250000,
1009 0, 0, 0, 0, 0, 0, 0, 0 };
1011 if (cflag & CBAUDEX)
1012 return ext_baud_table[(cflag & CBAUD) & ~CBAUDEX];
1014 return baud_table[cflag & CBAUD];
1017 /* and this maps to an etrax100 hardware baud constant */
1019 static unsigned char
1020 cflag_to_etrax_baud(unsigned int cflag)
1024 static char baud_table[] = {
1025 -1, -1, -1, -1, -1, -1, -1, 0, 1, 2, -1, 3, 4, 5, 6, 7 };
1027 static char ext_baud_table[] = {
1028 -1, 8, 9, 10, 11, 12, 13, 14, -1, -1, -1, -1, -1, -1, -1, -1 };
1030 if (cflag & CBAUDEX)
1031 retval = ext_baud_table[(cflag & CBAUD) & ~CBAUDEX];
1033 retval = baud_table[cflag & CBAUD];
1036 printk(KERN_WARNING "serdriver tried setting invalid baud rate, flags %x.\n", cflag);
1037 retval = 5; /* choose default 9600 instead */
1040 return retval | (retval << 4); /* choose same for both TX and RX */
1044 /* Various static support functions */
1046 /* Functions to set or clear DTR/RTS on the requested line */
1047 /* It is complicated by the fact that RTS is a serial port register, while
1048 * DTR might not be implemented in the HW at all, and if it is, it can be on
1054 e100_dtr(struct e100_serial *info, int set)
1056 #ifndef CONFIG_SVINTO_SIM
1057 unsigned char mask = e100_modem_pins[info->line].dtr_mask;
1059 #ifdef SERIAL_DEBUG_IO
1060 printk("ser%i dtr %i mask: 0x%02X\n", info->line, set, mask);
1061 printk("ser%i shadow before 0x%02X get: %i\n",
1062 info->line, *e100_modem_pins[info->line].dtr_shadow,
1063 E100_DTR_GET(info));
1065 /* DTR is active low */
1067 unsigned long flags;
1069 local_irq_save(flags);
1070 *e100_modem_pins[info->line].dtr_shadow &= ~mask;
1071 *e100_modem_pins[info->line].dtr_shadow |= (set ? 0 : mask);
1072 *e100_modem_pins[info->line].dtr_port = *e100_modem_pins[info->line].dtr_shadow;
1073 local_irq_restore(flags);
1076 #ifdef SERIAL_DEBUG_IO
1077 printk("ser%i shadow after 0x%02X get: %i\n",
1078 info->line, *e100_modem_pins[info->line].dtr_shadow,
1079 E100_DTR_GET(info));
1084 /* set = 0 means 3.3V on the pin, bitvalue: 0=active, 1=inactive
1088 e100_rts(struct e100_serial *info, int set)
1090 #ifndef CONFIG_SVINTO_SIM
1091 unsigned long flags;
1092 local_irq_save(flags);
1093 info->rx_ctrl &= ~E100_RTS_MASK;
1094 info->rx_ctrl |= (set ? 0 : E100_RTS_MASK); /* RTS is active low */
1095 info->port[REG_REC_CTRL] = info->rx_ctrl;
1096 local_irq_restore(flags);
1097 #ifdef SERIAL_DEBUG_IO
1098 printk("ser%i rts %i\n", info->line, set);
1104 /* If this behaves as a modem, RI and CD is an output */
1106 e100_ri_out(struct e100_serial *info, int set)
1108 #ifndef CONFIG_SVINTO_SIM
1109 /* RI is active low */
1111 unsigned char mask = e100_modem_pins[info->line].ri_mask;
1112 unsigned long flags;
1114 local_irq_save(flags);
1115 *e100_modem_pins[info->line].ri_shadow &= ~mask;
1116 *e100_modem_pins[info->line].ri_shadow |= (set ? 0 : mask);
1117 *e100_modem_pins[info->line].ri_port = *e100_modem_pins[info->line].ri_shadow;
1118 local_irq_restore(flags);
1123 e100_cd_out(struct e100_serial *info, int set)
1125 #ifndef CONFIG_SVINTO_SIM
1126 /* CD is active low */
1128 unsigned char mask = e100_modem_pins[info->line].cd_mask;
1129 unsigned long flags;
1131 local_irq_save(flags);
1132 *e100_modem_pins[info->line].cd_shadow &= ~mask;
1133 *e100_modem_pins[info->line].cd_shadow |= (set ? 0 : mask);
1134 *e100_modem_pins[info->line].cd_port = *e100_modem_pins[info->line].cd_shadow;
1135 local_irq_restore(flags);
1141 e100_disable_rx(struct e100_serial *info)
1143 #ifndef CONFIG_SVINTO_SIM
1144 /* disable the receiver */
1145 info->port[REG_REC_CTRL] =
1146 (info->rx_ctrl &= ~IO_MASK(R_SERIAL0_REC_CTRL, rec_enable));
1151 e100_enable_rx(struct e100_serial *info)
1153 #ifndef CONFIG_SVINTO_SIM
1154 /* enable the receiver */
1155 info->port[REG_REC_CTRL] =
1156 (info->rx_ctrl |= IO_MASK(R_SERIAL0_REC_CTRL, rec_enable));
1160 /* the rx DMA uses both the dma_descr and the dma_eop interrupts */
1163 e100_disable_rxdma_irq(struct e100_serial *info)
1165 #ifdef SERIAL_DEBUG_INTR
1166 printk("rxdma_irq(%d): 0\n",info->line);
1168 DINTR1(DEBUG_LOG(info->line,"IRQ disable_rxdma_irq %i\n", info->line));
1169 *R_IRQ_MASK2_CLR = (info->irq << 2) | (info->irq << 3);
1173 e100_enable_rxdma_irq(struct e100_serial *info)
1175 #ifdef SERIAL_DEBUG_INTR
1176 printk("rxdma_irq(%d): 1\n",info->line);
1178 DINTR1(DEBUG_LOG(info->line,"IRQ enable_rxdma_irq %i\n", info->line));
1179 *R_IRQ_MASK2_SET = (info->irq << 2) | (info->irq << 3);
1182 /* the tx DMA uses only dma_descr interrupt */
1184 static void e100_disable_txdma_irq(struct e100_serial *info)
1186 #ifdef SERIAL_DEBUG_INTR
1187 printk("txdma_irq(%d): 0\n",info->line);
1189 DINTR1(DEBUG_LOG(info->line,"IRQ disable_txdma_irq %i\n", info->line));
1190 *R_IRQ_MASK2_CLR = info->irq;
1193 static void e100_enable_txdma_irq(struct e100_serial *info)
1195 #ifdef SERIAL_DEBUG_INTR
1196 printk("txdma_irq(%d): 1\n",info->line);
1198 DINTR1(DEBUG_LOG(info->line,"IRQ enable_txdma_irq %i\n", info->line));
1199 *R_IRQ_MASK2_SET = info->irq;
1202 static void e100_disable_txdma_channel(struct e100_serial *info)
1204 unsigned long flags;
1206 /* Disable output DMA channel for the serial port in question
1207 * ( set to something other then serialX)
1209 local_irq_save(flags);
1210 DFLOW(DEBUG_LOG(info->line, "disable_txdma_channel %i\n", info->line));
1211 if (info->line == 0) {
1212 if ((genconfig_shadow & IO_MASK(R_GEN_CONFIG, dma6)) ==
1213 IO_STATE(R_GEN_CONFIG, dma6, serial0)) {
1214 genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma6);
1215 genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma6, unused);
1217 } else if (info->line == 1) {
1218 if ((genconfig_shadow & IO_MASK(R_GEN_CONFIG, dma8)) ==
1219 IO_STATE(R_GEN_CONFIG, dma8, serial1)) {
1220 genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma8);
1221 genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma8, usb);
1223 } else if (info->line == 2) {
1224 if ((genconfig_shadow & IO_MASK(R_GEN_CONFIG, dma2)) ==
1225 IO_STATE(R_GEN_CONFIG, dma2, serial2)) {
1226 genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma2);
1227 genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma2, par0);
1229 } else if (info->line == 3) {
1230 if ((genconfig_shadow & IO_MASK(R_GEN_CONFIG, dma4)) ==
1231 IO_STATE(R_GEN_CONFIG, dma4, serial3)) {
1232 genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma4);
1233 genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma4, par1);
1236 *R_GEN_CONFIG = genconfig_shadow;
1237 local_irq_restore(flags);
1241 static void e100_enable_txdma_channel(struct e100_serial *info)
1243 unsigned long flags;
1245 local_irq_save(flags);
1246 DFLOW(DEBUG_LOG(info->line, "enable_txdma_channel %i\n", info->line));
1247 /* Enable output DMA channel for the serial port in question */
1248 if (info->line == 0) {
1249 genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma6);
1250 genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma6, serial0);
1251 } else if (info->line == 1) {
1252 genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma8);
1253 genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma8, serial1);
1254 } else if (info->line == 2) {
1255 genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma2);
1256 genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma2, serial2);
1257 } else if (info->line == 3) {
1258 genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma4);
1259 genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma4, serial3);
1261 *R_GEN_CONFIG = genconfig_shadow;
1262 local_irq_restore(flags);
1265 static void e100_disable_rxdma_channel(struct e100_serial *info)
1267 unsigned long flags;
1269 /* Disable input DMA channel for the serial port in question
1270 * ( set to something other then serialX)
1272 local_irq_save(flags);
1273 if (info->line == 0) {
1274 if ((genconfig_shadow & IO_MASK(R_GEN_CONFIG, dma7)) ==
1275 IO_STATE(R_GEN_CONFIG, dma7, serial0)) {
1276 genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma7);
1277 genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma7, unused);
1279 } else if (info->line == 1) {
1280 if ((genconfig_shadow & IO_MASK(R_GEN_CONFIG, dma9)) ==
1281 IO_STATE(R_GEN_CONFIG, dma9, serial1)) {
1282 genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma9);
1283 genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma9, usb);
1285 } else if (info->line == 2) {
1286 if ((genconfig_shadow & IO_MASK(R_GEN_CONFIG, dma3)) ==
1287 IO_STATE(R_GEN_CONFIG, dma3, serial2)) {
1288 genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma3);
1289 genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma3, par0);
1291 } else if (info->line == 3) {
1292 if ((genconfig_shadow & IO_MASK(R_GEN_CONFIG, dma5)) ==
1293 IO_STATE(R_GEN_CONFIG, dma5, serial3)) {
1294 genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma5);
1295 genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma5, par1);
1298 *R_GEN_CONFIG = genconfig_shadow;
1299 local_irq_restore(flags);
1303 static void e100_enable_rxdma_channel(struct e100_serial *info)
1305 unsigned long flags;
1307 local_irq_save(flags);
1308 /* Enable input DMA channel for the serial port in question */
1309 if (info->line == 0) {
1310 genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma7);
1311 genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma7, serial0);
1312 } else if (info->line == 1) {
1313 genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma9);
1314 genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma9, serial1);
1315 } else if (info->line == 2) {
1316 genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma3);
1317 genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma3, serial2);
1318 } else if (info->line == 3) {
1319 genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma5);
1320 genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma5, serial3);
1322 *R_GEN_CONFIG = genconfig_shadow;
1323 local_irq_restore(flags);
1326 #ifdef SERIAL_HANDLE_EARLY_ERRORS
1327 /* in order to detect and fix errors on the first byte
1328 we have to use the serial interrupts as well. */
1331 e100_disable_serial_data_irq(struct e100_serial *info)
1333 #ifdef SERIAL_DEBUG_INTR
1334 printk("ser_irq(%d): 0\n",info->line);
1336 DINTR1(DEBUG_LOG(info->line,"IRQ disable data_irq %i\n", info->line));
1337 *R_IRQ_MASK1_CLR = (1U << (8+2*info->line));
1341 e100_enable_serial_data_irq(struct e100_serial *info)
1343 #ifdef SERIAL_DEBUG_INTR
1344 printk("ser_irq(%d): 1\n",info->line);
1345 printk("**** %d = %d\n",
1347 (1U << (8+2*info->line)));
1349 DINTR1(DEBUG_LOG(info->line,"IRQ enable data_irq %i\n", info->line));
1350 *R_IRQ_MASK1_SET = (1U << (8+2*info->line));
1355 e100_disable_serial_tx_ready_irq(struct e100_serial *info)
1357 #ifdef SERIAL_DEBUG_INTR
1358 printk("ser_tx_irq(%d): 0\n",info->line);
1360 DINTR1(DEBUG_LOG(info->line,"IRQ disable ready_irq %i\n", info->line));
1361 *R_IRQ_MASK1_CLR = (1U << (8+1+2*info->line));
1365 e100_enable_serial_tx_ready_irq(struct e100_serial *info)
1367 #ifdef SERIAL_DEBUG_INTR
1368 printk("ser_tx_irq(%d): 1\n",info->line);
1369 printk("**** %d = %d\n",
1371 (1U << (8+1+2*info->line)));
1373 DINTR2(DEBUG_LOG(info->line,"IRQ enable ready_irq %i\n", info->line));
1374 *R_IRQ_MASK1_SET = (1U << (8+1+2*info->line));
1377 static inline void e100_enable_rx_irq(struct e100_serial *info)
1379 if (info->uses_dma_in)
1380 e100_enable_rxdma_irq(info);
1382 e100_enable_serial_data_irq(info);
1384 static inline void e100_disable_rx_irq(struct e100_serial *info)
1386 if (info->uses_dma_in)
1387 e100_disable_rxdma_irq(info);
1389 e100_disable_serial_data_irq(info);
1392 #if defined(CONFIG_ETRAX_RS485)
1393 /* Enable RS-485 mode on selected port. This is UGLY. */
1395 e100_enable_rs485(struct tty_struct *tty,struct rs485_control *r)
1397 struct e100_serial * info = (struct e100_serial *)tty->driver_data;
1399 #if defined(CONFIG_ETRAX_RS485_ON_PA)
1400 *R_PORT_PA_DATA = port_pa_data_shadow |= (1 << rs485_pa_bit);
1402 #if defined(CONFIG_ETRAX_RS485_ON_PORT_G)
1403 REG_SHADOW_SET(R_PORT_G_DATA, port_g_data_shadow,
1404 rs485_port_g_bit, 1);
1406 #if defined(CONFIG_ETRAX_RS485_LTC1387)
1407 REG_SHADOW_SET(R_PORT_G_DATA, port_g_data_shadow,
1408 CONFIG_ETRAX_RS485_LTC1387_DXEN_PORT_G_BIT, 1);
1409 REG_SHADOW_SET(R_PORT_G_DATA, port_g_data_shadow,
1410 CONFIG_ETRAX_RS485_LTC1387_RXEN_PORT_G_BIT, 1);
1413 info->rs485.rts_on_send = 0x01 & r->rts_on_send;
1414 info->rs485.rts_after_sent = 0x01 & r->rts_after_sent;
1415 if (r->delay_rts_before_send >= 1000)
1416 info->rs485.delay_rts_before_send = 1000;
1418 info->rs485.delay_rts_before_send = r->delay_rts_before_send;
1419 info->rs485.enabled = r->enabled;
1420 /* printk("rts: on send = %i, after = %i, enabled = %i",
1421 info->rs485.rts_on_send,
1422 info->rs485.rts_after_sent,
1430 e100_write_rs485(struct tty_struct *tty,
1431 const unsigned char *buf, int count)
1433 struct e100_serial * info = (struct e100_serial *)tty->driver_data;
1434 int old_enabled = info->rs485.enabled;
1436 /* rs485 is always implicitly enabled if we're using the ioctl()
1437 * but it doesn't have to be set in the rs485_control
1438 * (to be backward compatible with old apps)
1439 * So we store, set and restore it.
1441 info->rs485.enabled = 1;
1442 /* rs_write now deals with RS485 if enabled */
1443 count = rs_write(tty, buf, count);
1444 info->rs485.enabled = old_enabled;
1448 #ifdef CONFIG_ETRAX_FAST_TIMER
1449 /* Timer function to toggle RTS when using FAST_TIMER */
1450 static void rs485_toggle_rts_timer_function(unsigned long data)
1452 struct e100_serial *info = (struct e100_serial *)data;
1454 fast_timers_rs485[info->line].function = NULL;
1455 e100_rts(info, info->rs485.rts_after_sent);
1456 #if defined(CONFIG_ETRAX_RS485_DISABLE_RECEIVER)
1457 e100_enable_rx(info);
1458 e100_enable_rx_irq(info);
1462 #endif /* CONFIG_ETRAX_RS485 */
1465 * ------------------------------------------------------------
1466 * rs_stop() and rs_start()
1468 * This routines are called before setting or resetting tty->stopped.
1469 * They enable or disable transmitter using the XOFF registers, as necessary.
1470 * ------------------------------------------------------------
1474 rs_stop(struct tty_struct *tty)
1476 struct e100_serial *info = (struct e100_serial *)tty->driver_data;
1478 unsigned long flags;
1481 local_irq_save(flags);
1482 DFLOW(DEBUG_LOG(info->line, "XOFF rs_stop xmit %i\n",
1483 CIRC_CNT(info->xmit.head,
1484 info->xmit.tail,SERIAL_XMIT_SIZE)));
1486 xoff = IO_FIELD(R_SERIAL0_XOFF, xoff_char, STOP_CHAR(info->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->port[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->port[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->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->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);
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->port[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->port[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->port[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->port[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);
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->tty;
2293 printk("!NO TTY!\n");
2297 /* Read data and status at the same time */
2298 data_read = *((unsigned long *)&info->port[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->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->port[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->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->port[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->port[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->port[REG_STATUS];
2531 DFLOW(DEBUG_LOG(info->line, "stat %x\n", rstat));
2533 info->port[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->port[REG_STATUS];
2548 DFLOW(DEBUG_LOG(info->line, "stat %x\n", rstat));
2549 e100_disable_serial_tx_ready_irq(info);
2550 if (info->tty->stopped)
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->tty->stopped
2565 || info->tty->hw_stopped) {
2566 DFLOW(DEBUG_LOG(info->line, "tx_int: stopped %i\n", info->tty->stopped));
2567 e100_disable_serial_tx_ready_irq(info);
2568 info->tr_running = 0;
2571 DINTR2(DEBUG_LOG(info->line, "tx_int %c\n", info->xmit.buf[info->xmit.tail]));
2572 /* Send a byte, rs485 timing is critical so turn of ints */
2573 local_irq_save(flags);
2574 info->port[REG_TR_DATA] = info->xmit.buf[info->xmit.tail];
2575 info->xmit.tail = (info->xmit.tail + 1) & (SERIAL_XMIT_SIZE-1);
2577 if (info->xmit.head == info->xmit.tail) {
2578 #if defined(CONFIG_ETRAX_RS485) && defined(CONFIG_ETRAX_FAST_TIMER)
2579 if (info->rs485.enabled) {
2580 /* Set a short timer to toggle RTS */
2581 start_one_shot_timer(&fast_timers_rs485[info->line],
2582 rs485_toggle_rts_timer_function,
2583 (unsigned long)info,
2584 info->char_time_usec*2,
2588 info->last_tx_active_usec = GET_JIFFIES_USEC();
2589 info->last_tx_active = jiffies;
2590 e100_disable_serial_tx_ready_irq(info);
2591 info->tr_running = 0;
2592 DFLOW(DEBUG_LOG(info->line, "tx_int: stop2\n", 0));
2594 /* We must enable since it is disabled in ser_interrupt */
2595 e100_enable_serial_tx_ready_irq(info);
2597 local_irq_restore(flags);
2599 if (CIRC_CNT(info->xmit.head,
2601 SERIAL_XMIT_SIZE) < WAKEUP_CHARS)
2602 rs_sched_event(info, RS_EVENT_WRITE_WAKEUP);
2604 } /* handle_ser_tx_interrupt */
2606 /* result of time measurements:
2607 * RX duration 54-60 us when doing something, otherwise 6-9 us
2608 * ser_int duration: just sending: 8-15 us normally, up to 73 us
2611 ser_interrupt(int irq, void *dev_id)
2613 static volatile int tx_started = 0;
2614 struct e100_serial *info;
2616 unsigned long flags;
2617 unsigned long irq_mask1_rd;
2618 unsigned long data_mask = (1 << (8+2*0)); /* ser0 data_avail */
2620 static volatile unsigned long reentered_ready_mask = 0;
2622 local_irq_save(flags);
2623 irq_mask1_rd = *R_IRQ_MASK1_RD;
2624 /* First handle all rx interrupts with ints disabled */
2626 irq_mask1_rd &= e100_ser_int_mask;
2627 for (i = 0; i < NR_PORTS; i++) {
2628 /* Which line caused the data irq? */
2629 if (irq_mask1_rd & data_mask) {
2631 handle_ser_rx_interrupt(info);
2636 /* Handle tx interrupts with interrupts enabled so we
2637 * can take care of new data interrupts while transmitting
2638 * We protect the tx part with the tx_started flag.
2639 * We disable the tr_ready interrupts we are about to handle and
2640 * unblock the serial interrupt so new serial interrupts may come.
2642 * If we get a new interrupt:
2643 * - it migth be due to synchronous serial ports.
2644 * - serial irq will be blocked by general irq handler.
2645 * - async data will be handled above (sync will be ignored).
2646 * - tx_started flag will prevent us from trying to send again and
2647 * we will exit fast - no need to unblock serial irq.
2648 * - Next (sync) serial interrupt handler will be runned with
2649 * disabled interrupt due to restore_flags() at end of function,
2650 * so sync handler will not be preempted or reentered.
2653 unsigned long ready_mask;
2656 /* Only the tr_ready interrupts left */
2657 irq_mask1_rd &= (IO_MASK(R_IRQ_MASK1_RD, ser0_ready) |
2658 IO_MASK(R_IRQ_MASK1_RD, ser1_ready) |
2659 IO_MASK(R_IRQ_MASK1_RD, ser2_ready) |
2660 IO_MASK(R_IRQ_MASK1_RD, ser3_ready));
2661 while (irq_mask1_rd) {
2662 /* Disable those we are about to handle */
2663 *R_IRQ_MASK1_CLR = irq_mask1_rd;
2664 /* Unblock the serial interrupt */
2665 *R_VECT_MASK_SET = IO_STATE(R_VECT_MASK_SET, serial, set);
2668 ready_mask = (1 << (8+1+2*0)); /* ser0 tr_ready */
2670 for (i = 0; i < NR_PORTS; i++) {
2671 /* Which line caused the ready irq? */
2672 if (irq_mask1_rd & ready_mask) {
2674 handle_ser_tx_interrupt(info);
2679 /* handle_ser_tx_interrupt enables tr_ready interrupts */
2680 local_irq_disable();
2681 /* Handle reentered TX interrupt */
2682 irq_mask1_rd = reentered_ready_mask;
2684 local_irq_disable();
2687 unsigned long ready_mask;
2688 ready_mask = irq_mask1_rd & (IO_MASK(R_IRQ_MASK1_RD, ser0_ready) |
2689 IO_MASK(R_IRQ_MASK1_RD, ser1_ready) |
2690 IO_MASK(R_IRQ_MASK1_RD, ser2_ready) |
2691 IO_MASK(R_IRQ_MASK1_RD, ser3_ready));
2693 reentered_ready_mask |= ready_mask;
2694 /* Disable those we are about to handle */
2695 *R_IRQ_MASK1_CLR = ready_mask;
2696 DFLOW(DEBUG_LOG(SERIAL_DEBUG_LINE, "ser_int reentered with TX %X\n", ready_mask));
2700 local_irq_restore(flags);
2701 return IRQ_RETVAL(handled);
2702 } /* ser_interrupt */
2706 * -------------------------------------------------------------------
2707 * Here ends the serial interrupt routines.
2708 * -------------------------------------------------------------------
2712 * This routine is used to handle the "bottom half" processing for the
2713 * serial driver, known also the "software interrupt" processing.
2714 * This processing is done at the kernel interrupt level, after the
2715 * rs_interrupt() has returned, BUT WITH INTERRUPTS TURNED ON. This
2716 * is where time-consuming activities which can not be done in the
2717 * interrupt driver proper are done; the interrupt driver schedules
2718 * them using rs_sched_event(), and they get done here.
2721 do_softint(struct work_struct *work)
2723 struct e100_serial *info;
2724 struct tty_struct *tty;
2726 info = container_of(work, struct e100_serial, work);
2732 if (test_and_clear_bit(RS_EVENT_WRITE_WAKEUP, &info->event))
2737 startup(struct e100_serial * info)
2739 unsigned long flags;
2740 unsigned long xmit_page;
2743 xmit_page = get_zeroed_page(GFP_KERNEL);
2747 local_irq_save(flags);
2749 /* if it was already initialized, skip this */
2751 if (info->flags & ASYNC_INITIALIZED) {
2752 local_irq_restore(flags);
2753 free_page(xmit_page);
2758 free_page(xmit_page);
2760 info->xmit.buf = (unsigned char *) xmit_page;
2762 #ifdef SERIAL_DEBUG_OPEN
2763 printk("starting up ttyS%d (xmit_buf 0x%p)...\n", info->line, info->xmit.buf);
2766 #ifdef CONFIG_SVINTO_SIM
2767 /* Bits and pieces collected from below. Better to have them
2768 in one ifdef:ed clause than to mix in a lot of ifdefs,
2771 clear_bit(TTY_IO_ERROR, &info->tty->flags);
2773 info->xmit.head = info->xmit.tail = 0;
2774 info->first_recv_buffer = info->last_recv_buffer = NULL;
2775 info->recv_cnt = info->max_recv_cnt = 0;
2777 for (i = 0; i < SERIAL_RECV_DESCRIPTORS; i++)
2778 info->rec_descr[i].buf = NULL;
2780 /* No real action in the simulator, but may set info important
2786 * Clear the FIFO buffers and disable them
2787 * (they will be reenabled in change_speed())
2791 * Reset the DMA channels and make sure their interrupts are cleared
2794 if (info->dma_in_enabled) {
2795 info->uses_dma_in = 1;
2796 e100_enable_rxdma_channel(info);
2798 *info->icmdadr = IO_STATE(R_DMA_CH6_CMD, cmd, reset);
2800 /* Wait until reset cycle is complete */
2801 while (IO_EXTRACT(R_DMA_CH6_CMD, cmd, *info->icmdadr) ==
2802 IO_STATE_VALUE(R_DMA_CH6_CMD, cmd, reset));
2804 /* Make sure the irqs are cleared */
2805 *info->iclrintradr =
2806 IO_STATE(R_DMA_CH6_CLR_INTR, clr_descr, do) |
2807 IO_STATE(R_DMA_CH6_CLR_INTR, clr_eop, do);
2809 e100_disable_rxdma_channel(info);
2812 if (info->dma_out_enabled) {
2813 info->uses_dma_out = 1;
2814 e100_enable_txdma_channel(info);
2815 *info->ocmdadr = IO_STATE(R_DMA_CH6_CMD, cmd, reset);
2817 while (IO_EXTRACT(R_DMA_CH6_CMD, cmd, *info->ocmdadr) ==
2818 IO_STATE_VALUE(R_DMA_CH6_CMD, cmd, reset));
2820 /* Make sure the irqs are cleared */
2821 *info->oclrintradr =
2822 IO_STATE(R_DMA_CH6_CLR_INTR, clr_descr, do) |
2823 IO_STATE(R_DMA_CH6_CLR_INTR, clr_eop, do);
2825 e100_disable_txdma_channel(info);
2829 clear_bit(TTY_IO_ERROR, &info->tty->flags);
2831 info->xmit.head = info->xmit.tail = 0;
2832 info->first_recv_buffer = info->last_recv_buffer = NULL;
2833 info->recv_cnt = info->max_recv_cnt = 0;
2835 for (i = 0; i < SERIAL_RECV_DESCRIPTORS; i++)
2836 info->rec_descr[i].buf = 0;
2839 * and set the speed and other flags of the serial port
2840 * this will start the rx/tx as well
2842 #ifdef SERIAL_HANDLE_EARLY_ERRORS
2843 e100_enable_serial_data_irq(info);
2847 /* dummy read to reset any serial errors */
2849 (void)info->port[REG_DATA];
2851 /* enable the interrupts */
2852 if (info->uses_dma_out)
2853 e100_enable_txdma_irq(info);
2855 e100_enable_rx_irq(info);
2857 info->tr_running = 0; /* to be sure we don't lock up the transmitter */
2859 /* setup the dma input descriptor and start dma */
2861 start_receive(info);
2863 /* for safety, make sure the descriptors last result is 0 bytes written */
2865 info->tr_descr.sw_len = 0;
2866 info->tr_descr.hw_len = 0;
2867 info->tr_descr.status = 0;
2869 /* enable RTS/DTR last */
2874 #endif /* CONFIG_SVINTO_SIM */
2876 info->flags |= ASYNC_INITIALIZED;
2878 local_irq_restore(flags);
2883 * This routine will shutdown a serial port; interrupts are disabled, and
2884 * DTR is dropped if the hangup on close termio flag is on.
2887 shutdown(struct e100_serial * info)
2889 unsigned long flags;
2890 struct etrax_dma_descr *descr = info->rec_descr;
2891 struct etrax_recv_buffer *buffer;
2894 #ifndef CONFIG_SVINTO_SIM
2895 /* shut down the transmitter and receiver */
2896 DFLOW(DEBUG_LOG(info->line, "shutdown %i\n", info->line));
2897 e100_disable_rx(info);
2898 info->port[REG_TR_CTRL] = (info->tx_ctrl &= ~0x40);
2900 /* disable interrupts, reset dma channels */
2901 if (info->uses_dma_in) {
2902 e100_disable_rxdma_irq(info);
2903 *info->icmdadr = IO_STATE(R_DMA_CH6_CMD, cmd, reset);
2904 info->uses_dma_in = 0;
2906 e100_disable_serial_data_irq(info);
2909 if (info->uses_dma_out) {
2910 e100_disable_txdma_irq(info);
2911 info->tr_running = 0;
2912 *info->ocmdadr = IO_STATE(R_DMA_CH6_CMD, cmd, reset);
2913 info->uses_dma_out = 0;
2915 e100_disable_serial_tx_ready_irq(info);
2916 info->tr_running = 0;
2919 #endif /* CONFIG_SVINTO_SIM */
2921 if (!(info->flags & ASYNC_INITIALIZED))
2924 #ifdef SERIAL_DEBUG_OPEN
2925 printk("Shutting down serial port %d (irq %d)....\n", info->line,
2929 local_irq_save(flags);
2931 if (info->xmit.buf) {
2932 free_page((unsigned long)info->xmit.buf);
2933 info->xmit.buf = NULL;
2936 for (i = 0; i < SERIAL_RECV_DESCRIPTORS; i++)
2938 buffer = phys_to_virt(descr[i].buf) - sizeof *buffer;
2943 if (!info->tty || (info->tty->termios->c_cflag & HUPCL)) {
2944 /* hang up DTR and RTS if HUPCL is enabled */
2946 e100_rts(info, 0); /* could check CRTSCTS before doing this */
2950 set_bit(TTY_IO_ERROR, &info->tty->flags);
2952 info->flags &= ~ASYNC_INITIALIZED;
2953 local_irq_restore(flags);
2957 /* change baud rate and other assorted parameters */
2960 change_speed(struct e100_serial *info)
2964 unsigned long flags;
2965 /* first some safety checks */
2967 if (!info->tty || !info->tty->termios)
2972 cflag = info->tty->termios->c_cflag;
2974 /* possibly, the tx/rx should be disabled first to do this safely */
2976 /* change baud-rate and write it to the hardware */
2977 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST) {
2978 /* Special baudrate */
2979 u32 mask = 0xFF << (info->line*8); /* Each port has 8 bits */
2980 unsigned long alt_source =
2981 IO_STATE(R_ALT_SER_BAUDRATE, ser0_rec, normal) |
2982 IO_STATE(R_ALT_SER_BAUDRATE, ser0_tr, normal);
2983 /* R_ALT_SER_BAUDRATE selects the source */
2984 DBAUD(printk("Custom baudrate: baud_base/divisor %lu/%i\n",
2985 (unsigned long)info->baud_base, info->custom_divisor));
2986 if (info->baud_base == SERIAL_PRESCALE_BASE) {
2987 /* 0, 2-65535 (0=65536) */
2988 u16 divisor = info->custom_divisor;
2989 /* R_SERIAL_PRESCALE (upper 16 bits of R_CLOCK_PRESCALE) */
2990 /* baudrate is 3.125MHz/custom_divisor */
2992 IO_STATE(R_ALT_SER_BAUDRATE, ser0_rec, prescale) |
2993 IO_STATE(R_ALT_SER_BAUDRATE, ser0_tr, prescale);
2995 DBAUD(printk("Writing SERIAL_PRESCALE: divisor %i\n", divisor));
2996 *R_SERIAL_PRESCALE = divisor;
2997 info->baud = SERIAL_PRESCALE_BASE/divisor;
2999 #ifdef CONFIG_ETRAX_EXTERN_PB6CLK_ENABLED
3000 else if ((info->baud_base==CONFIG_ETRAX_EXTERN_PB6CLK_FREQ/8 &&
3001 info->custom_divisor == 1) ||
3002 (info->baud_base==CONFIG_ETRAX_EXTERN_PB6CLK_FREQ &&
3003 info->custom_divisor == 8)) {
3004 /* ext_clk selected */
3006 IO_STATE(R_ALT_SER_BAUDRATE, ser0_rec, extern) |
3007 IO_STATE(R_ALT_SER_BAUDRATE, ser0_tr, extern);
3008 DBAUD(printk("using external baudrate: %lu\n", CONFIG_ETRAX_EXTERN_PB6CLK_FREQ/8));
3009 info->baud = CONFIG_ETRAX_EXTERN_PB6CLK_FREQ/8;
3014 /* Bad baudbase, we don't support using timer0
3017 printk(KERN_WARNING "Bad baud_base/custom_divisor: %lu/%i\n",
3018 (unsigned long)info->baud_base, info->custom_divisor);
3020 r_alt_ser_baudrate_shadow &= ~mask;
3021 r_alt_ser_baudrate_shadow |= (alt_source << (info->line*8));
3022 *R_ALT_SER_BAUDRATE = r_alt_ser_baudrate_shadow;
3024 /* Normal baudrate */
3025 /* Make sure we use normal baudrate */
3026 u32 mask = 0xFF << (info->line*8); /* Each port has 8 bits */
3027 unsigned long alt_source =
3028 IO_STATE(R_ALT_SER_BAUDRATE, ser0_rec, normal) |
3029 IO_STATE(R_ALT_SER_BAUDRATE, ser0_tr, normal);
3030 r_alt_ser_baudrate_shadow &= ~mask;
3031 r_alt_ser_baudrate_shadow |= (alt_source << (info->line*8));
3032 #ifndef CONFIG_SVINTO_SIM
3033 *R_ALT_SER_BAUDRATE = r_alt_ser_baudrate_shadow;
3034 #endif /* CONFIG_SVINTO_SIM */
3036 info->baud = cflag_to_baud(cflag);
3037 #ifndef CONFIG_SVINTO_SIM
3038 info->port[REG_BAUD] = cflag_to_etrax_baud(cflag);
3039 #endif /* CONFIG_SVINTO_SIM */
3042 #ifndef CONFIG_SVINTO_SIM
3043 /* start with default settings and then fill in changes */
3044 local_irq_save(flags);
3045 /* 8 bit, no/even parity */
3046 info->rx_ctrl &= ~(IO_MASK(R_SERIAL0_REC_CTRL, rec_bitnr) |
3047 IO_MASK(R_SERIAL0_REC_CTRL, rec_par_en) |
3048 IO_MASK(R_SERIAL0_REC_CTRL, rec_par));
3050 /* 8 bit, no/even parity, 1 stop bit, no cts */
3051 info->tx_ctrl &= ~(IO_MASK(R_SERIAL0_TR_CTRL, tr_bitnr) |
3052 IO_MASK(R_SERIAL0_TR_CTRL, tr_par_en) |
3053 IO_MASK(R_SERIAL0_TR_CTRL, tr_par) |
3054 IO_MASK(R_SERIAL0_TR_CTRL, stop_bits) |
3055 IO_MASK(R_SERIAL0_TR_CTRL, auto_cts));
3057 if ((cflag & CSIZE) == CS7) {
3058 /* set 7 bit mode */
3059 info->tx_ctrl |= IO_STATE(R_SERIAL0_TR_CTRL, tr_bitnr, tr_7bit);
3060 info->rx_ctrl |= IO_STATE(R_SERIAL0_REC_CTRL, rec_bitnr, rec_7bit);
3063 if (cflag & CSTOPB) {
3064 /* set 2 stop bit mode */
3065 info->tx_ctrl |= IO_STATE(R_SERIAL0_TR_CTRL, stop_bits, two_bits);
3068 if (cflag & PARENB) {
3070 info->tx_ctrl |= IO_STATE(R_SERIAL0_TR_CTRL, tr_par_en, enable);
3071 info->rx_ctrl |= IO_STATE(R_SERIAL0_REC_CTRL, rec_par_en, enable);
3074 if (cflag & CMSPAR) {
3075 /* enable stick parity, PARODD mean Mark which matches ETRAX */
3076 info->tx_ctrl |= IO_STATE(R_SERIAL0_TR_CTRL, tr_stick_par, stick);
3077 info->rx_ctrl |= IO_STATE(R_SERIAL0_REC_CTRL, rec_stick_par, stick);
3079 if (cflag & PARODD) {
3080 /* set odd parity (or Mark if CMSPAR) */
3081 info->tx_ctrl |= IO_STATE(R_SERIAL0_TR_CTRL, tr_par, odd);
3082 info->rx_ctrl |= IO_STATE(R_SERIAL0_REC_CTRL, rec_par, odd);
3085 if (cflag & CRTSCTS) {
3086 /* enable automatic CTS handling */
3087 DFLOW(DEBUG_LOG(info->line, "FLOW auto_cts enabled\n", 0));
3088 info->tx_ctrl |= IO_STATE(R_SERIAL0_TR_CTRL, auto_cts, active);
3091 /* make sure the tx and rx are enabled */
3093 info->tx_ctrl |= IO_STATE(R_SERIAL0_TR_CTRL, tr_enable, enable);
3094 info->rx_ctrl |= IO_STATE(R_SERIAL0_REC_CTRL, rec_enable, enable);
3096 /* actually write the control regs to the hardware */
3098 info->port[REG_TR_CTRL] = info->tx_ctrl;
3099 info->port[REG_REC_CTRL] = info->rx_ctrl;
3100 xoff = IO_FIELD(R_SERIAL0_XOFF, xoff_char, STOP_CHAR(info->tty));
3101 xoff |= IO_STATE(R_SERIAL0_XOFF, tx_stop, enable);
3102 if (info->tty->termios->c_iflag & IXON ) {
3103 DFLOW(DEBUG_LOG(info->line, "FLOW XOFF enabled 0x%02X\n", STOP_CHAR(info->tty)));
3104 xoff |= IO_STATE(R_SERIAL0_XOFF, auto_xoff, enable);
3107 *((unsigned long *)&info->port[REG_XOFF]) = xoff;
3108 local_irq_restore(flags);
3109 #endif /* !CONFIG_SVINTO_SIM */
3111 update_char_time(info);
3113 } /* change_speed */
3115 /* start transmitting chars NOW */
3118 rs_flush_chars(struct tty_struct *tty)
3120 struct e100_serial *info = (struct e100_serial *)tty->driver_data;
3121 unsigned long flags;
3123 if (info->tr_running ||
3124 info->xmit.head == info->xmit.tail ||
3130 #ifdef SERIAL_DEBUG_FLOW
3131 printk("rs_flush_chars\n");
3134 /* this protection might not exactly be necessary here */
3136 local_irq_save(flags);
3137 start_transmit(info);
3138 local_irq_restore(flags);
3141 static int rs_raw_write(struct tty_struct *tty,
3142 const unsigned char *buf, int count)
3145 struct e100_serial *info = (struct e100_serial *)tty->driver_data;
3146 unsigned long flags;
3148 /* first some sanity checks */
3150 if (!tty || !info->xmit.buf || !tmp_buf)
3153 #ifdef SERIAL_DEBUG_DATA
3154 if (info->line == SERIAL_DEBUG_LINE)
3155 printk("rs_raw_write (%d), status %d\n",
3156 count, info->port[REG_STATUS]);
3159 #ifdef CONFIG_SVINTO_SIM
3160 /* Really simple. The output is here and now. */
3161 SIMCOUT(buf, count);
3164 local_save_flags(flags);
3165 DFLOW(DEBUG_LOG(info->line, "write count %i ", count));
3166 DFLOW(DEBUG_LOG(info->line, "ldisc %i\n", tty->ldisc.chars_in_buffer(tty)));
3169 /* The local_irq_disable/restore_flags pairs below are needed
3170 * because the DMA interrupt handler moves the info->xmit values.
3171 * the memcpy needs to be in the critical region unfortunately,
3172 * because we need to read xmit values, memcpy, write xmit values
3173 * in one atomic operation... this could perhaps be avoided by
3174 * more clever design.
3176 local_irq_disable();
3178 c = CIRC_SPACE_TO_END(info->xmit.head,
3187 memcpy(info->xmit.buf + info->xmit.head, buf, c);
3188 info->xmit.head = (info->xmit.head + c) &
3189 (SERIAL_XMIT_SIZE-1);
3194 local_irq_restore(flags);
3196 /* enable transmitter if not running, unless the tty is stopped
3197 * this does not need IRQ protection since if tr_running == 0
3198 * the IRQ's are not running anyway for this port.
3200 DFLOW(DEBUG_LOG(info->line, "write ret %i\n", ret));
3202 if (info->xmit.head != info->xmit.tail &&
3205 !info->tr_running) {
3206 start_transmit(info);
3210 } /* raw_raw_write() */
3213 rs_write(struct tty_struct *tty,
3214 const unsigned char *buf, int count)
3216 #if defined(CONFIG_ETRAX_RS485)
3217 struct e100_serial *info = (struct e100_serial *)tty->driver_data;
3219 if (info->rs485.enabled)
3221 /* If we are in RS-485 mode, we need to toggle RTS and disable
3222 * the receiver before initiating a DMA transfer
3224 #ifdef CONFIG_ETRAX_FAST_TIMER
3225 /* Abort any started timer */
3226 fast_timers_rs485[info->line].function = NULL;
3227 del_fast_timer(&fast_timers_rs485[info->line]);
3229 e100_rts(info, info->rs485.rts_on_send);
3230 #if defined(CONFIG_ETRAX_RS485_DISABLE_RECEIVER)
3231 e100_disable_rx(info);
3232 e100_enable_rx_irq(info);
3235 if (info->rs485.delay_rts_before_send > 0)
3236 msleep(info->rs485.delay_rts_before_send);
3238 #endif /* CONFIG_ETRAX_RS485 */
3240 count = rs_raw_write(tty, buf, count);
3242 #if defined(CONFIG_ETRAX_RS485)
3243 if (info->rs485.enabled)
3246 /* If we are in RS-485 mode the following has to be done:
3247 * wait until DMA is ready
3248 * wait on transmit shift register
3250 * enable the receiver
3253 /* Sleep until all sent */
3254 tty_wait_until_sent(tty, 0);
3255 #ifdef CONFIG_ETRAX_FAST_TIMER
3256 /* Now sleep a little more so that shift register is empty */
3257 schedule_usleep(info->char_time_usec * 2);
3259 /* wait on transmit shift register */
3261 get_lsr_info(info, &val);
3262 }while (!(val & TIOCSER_TEMT));
3264 e100_rts(info, info->rs485.rts_after_sent);
3266 #if defined(CONFIG_ETRAX_RS485_DISABLE_RECEIVER)
3267 e100_enable_rx(info);
3268 e100_enable_rxdma_irq(info);
3271 #endif /* CONFIG_ETRAX_RS485 */
3277 /* how much space is available in the xmit buffer? */
3280 rs_write_room(struct tty_struct *tty)
3282 struct e100_serial *info = (struct e100_serial *)tty->driver_data;
3284 return CIRC_SPACE(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
3287 /* How many chars are in the xmit buffer?
3288 * This does not include any chars in the transmitter FIFO.
3289 * Use wait_until_sent for waiting for FIFO drain.
3293 rs_chars_in_buffer(struct tty_struct *tty)
3295 struct e100_serial *info = (struct e100_serial *)tty->driver_data;
3297 return CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
3300 /* discard everything in the xmit buffer */
3303 rs_flush_buffer(struct tty_struct *tty)
3305 struct e100_serial *info = (struct e100_serial *)tty->driver_data;
3306 unsigned long flags;
3308 local_irq_save(flags);
3309 info->xmit.head = info->xmit.tail = 0;
3310 local_irq_restore(flags);
3316 * This function is used to send a high-priority XON/XOFF character to
3319 * Since we use DMA we don't check for info->x_char in transmit_chars_dma(),
3320 * but we do it in handle_ser_tx_interrupt().
3321 * We disable DMA channel and enable tx ready interrupt and write the
3322 * character when possible.
3324 static void rs_send_xchar(struct tty_struct *tty, char ch)
3326 struct e100_serial *info = (struct e100_serial *)tty->driver_data;
3327 unsigned long flags;
3328 local_irq_save(flags);
3329 if (info->uses_dma_out) {
3330 /* Put the DMA on hold and disable the channel */
3331 *info->ocmdadr = IO_STATE(R_DMA_CH6_CMD, cmd, hold);
3332 while (IO_EXTRACT(R_DMA_CH6_CMD, cmd, *info->ocmdadr) !=
3333 IO_STATE_VALUE(R_DMA_CH6_CMD, cmd, hold));
3334 e100_disable_txdma_channel(info);
3337 /* Must make sure transmitter is not stopped before we can transmit */
3341 /* Enable manual transmit interrupt and send from there */
3342 DFLOW(DEBUG_LOG(info->line, "rs_send_xchar 0x%02X\n", ch));
3344 e100_enable_serial_tx_ready_irq(info);
3345 local_irq_restore(flags);
3349 * ------------------------------------------------------------
3352 * This routine is called by the upper-layer tty layer to signal that
3353 * incoming characters should be throttled.
3354 * ------------------------------------------------------------
3357 rs_throttle(struct tty_struct * tty)
3359 struct e100_serial *info = (struct e100_serial *)tty->driver_data;
3360 #ifdef SERIAL_DEBUG_THROTTLE
3363 printk("throttle %s: %lu....\n", tty_name(tty, buf),
3364 (unsigned long)tty->ldisc.chars_in_buffer(tty));
3366 DFLOW(DEBUG_LOG(info->line,"rs_throttle %lu\n", tty->ldisc.chars_in_buffer(tty)));
3368 /* Do RTS before XOFF since XOFF might take some time */
3369 if (tty->termios->c_cflag & CRTSCTS) {
3370 /* Turn off RTS line */
3374 rs_send_xchar(tty, STOP_CHAR(tty));
3379 rs_unthrottle(struct tty_struct * tty)
3381 struct e100_serial *info = (struct e100_serial *)tty->driver_data;
3382 #ifdef SERIAL_DEBUG_THROTTLE
3385 printk("unthrottle %s: %lu....\n", tty_name(tty, buf),
3386 (unsigned long)tty->ldisc.chars_in_buffer(tty));
3388 DFLOW(DEBUG_LOG(info->line,"rs_unthrottle ldisc %d\n", tty->ldisc.chars_in_buffer(tty)));
3389 DFLOW(DEBUG_LOG(info->line,"rs_unthrottle flip.count: %i\n", tty->flip.count));
3390 /* Do RTS before XOFF since XOFF might take some time */
3391 if (tty->termios->c_cflag & CRTSCTS) {
3392 /* Assert RTS line */
3400 rs_send_xchar(tty, START_CHAR(tty));
3406 * ------------------------------------------------------------
3407 * rs_ioctl() and friends
3408 * ------------------------------------------------------------
3412 get_serial_info(struct e100_serial * info,
3413 struct serial_struct * retinfo)
3415 struct serial_struct tmp;
3417 /* this is all probably wrong, there are a lot of fields
3418 * here that we don't have in e100_serial and maybe we
3419 * should set them to something else than 0.
3424 memset(&tmp, 0, sizeof(tmp));
3425 tmp.type = info->type;
3426 tmp.line = info->line;
3427 tmp.port = (int)info->port;
3428 tmp.irq = info->irq;
3429 tmp.flags = info->flags;
3430 tmp.baud_base = info->baud_base;
3431 tmp.close_delay = info->close_delay;
3432 tmp.closing_wait = info->closing_wait;
3433 tmp.custom_divisor = info->custom_divisor;
3434 if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
3440 set_serial_info(struct e100_serial *info,
3441 struct serial_struct *new_info)
3443 struct serial_struct new_serial;
3444 struct e100_serial old_info;
3447 if (copy_from_user(&new_serial, new_info, sizeof(new_serial)))
3452 if (!capable(CAP_SYS_ADMIN)) {
3453 if ((new_serial.type != info->type) ||
3454 (new_serial.close_delay != info->close_delay) ||
3455 ((new_serial.flags & ~ASYNC_USR_MASK) !=
3456 (info->flags & ~ASYNC_USR_MASK)))
3458 info->flags = ((info->flags & ~ASYNC_USR_MASK) |
3459 (new_serial.flags & ASYNC_USR_MASK));
3460 goto check_and_exit;
3463 if (info->count > 1)
3467 * OK, past this point, all the error checking has been done.
3468 * At this point, we start making changes.....
3471 info->baud_base = new_serial.baud_base;
3472 info->flags = ((info->flags & ~ASYNC_FLAGS) |
3473 (new_serial.flags & ASYNC_FLAGS));
3474 info->custom_divisor = new_serial.custom_divisor;
3475 info->type = new_serial.type;
3476 info->close_delay = new_serial.close_delay;
3477 info->closing_wait = new_serial.closing_wait;
3478 info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
3481 if (info->flags & ASYNC_INITIALIZED) {
3484 retval = startup(info);
3489 * get_lsr_info - get line status register info
3491 * Purpose: Let user call ioctl() to get info when the UART physically
3492 * is emptied. On bus types like RS485, the transmitter must
3493 * release the bus after transmitting. This must be done when
3494 * the transmit shift register is empty, not be done when the
3495 * transmit holding register is empty. This functionality
3496 * allows an RS485 driver to be written in user space.
3499 get_lsr_info(struct e100_serial * info, unsigned int *value)
3501 unsigned int result = TIOCSER_TEMT;
3502 #ifndef CONFIG_SVINTO_SIM
3503 unsigned long curr_time = jiffies;
3504 unsigned long curr_time_usec = GET_JIFFIES_USEC();
3505 unsigned long elapsed_usec =
3506 (curr_time - info->last_tx_active) * 1000000/HZ +
3507 curr_time_usec - info->last_tx_active_usec;
3509 if (info->xmit.head != info->xmit.tail ||
3510 elapsed_usec < 2*info->char_time_usec) {
3515 if (copy_to_user(value, &result, sizeof(int)))
3520 #ifdef SERIAL_DEBUG_IO
3527 const struct state_str control_state_str[] = {
3528 {TIOCM_DTR, "DTR" },
3532 {TIOCM_CTS, "CTS" },
3535 {TIOCM_DSR, "DSR" },
3539 char *get_control_state_str(int MLines, char *s)
3544 while (control_state_str[i].str != NULL) {
3545 if (MLines & control_state_str[i].state) {
3549 strcat(s, control_state_str[i].str);
3558 rs_break(struct tty_struct *tty, int break_state)
3560 struct e100_serial *info = (struct e100_serial *)tty->driver_data;
3561 unsigned long flags;
3566 local_irq_save(flags);
3567 if (break_state == -1) {
3568 /* Go to manual mode and set the txd pin to 0 */
3569 /* Clear bit 7 (txd) and 6 (tr_enable) */
3570 info->tx_ctrl &= 0x3F;
3572 /* Set bit 7 (txd) and 6 (tr_enable) */
3573 info->tx_ctrl |= (0x80 | 0x40);
3575 info->port[REG_TR_CTRL] = info->tx_ctrl;
3576 local_irq_restore(flags);
3580 rs_tiocmset(struct tty_struct *tty, struct file *file,
3581 unsigned int set, unsigned int clear)
3583 struct e100_serial *info = (struct e100_serial *)tty->driver_data;
3584 unsigned long flags;
3586 local_irq_save(flags);
3588 if (clear & TIOCM_RTS)
3590 if (clear & TIOCM_DTR)
3592 /* Handle FEMALE behaviour */
3593 if (clear & TIOCM_RI)
3594 e100_ri_out(info, 0);
3595 if (clear & TIOCM_CD)
3596 e100_cd_out(info, 0);
3598 if (set & TIOCM_RTS)
3600 if (set & TIOCM_DTR)
3602 /* Handle FEMALE behaviour */
3604 e100_ri_out(info, 1);
3606 e100_cd_out(info, 1);
3608 local_irq_restore(flags);
3613 rs_tiocmget(struct tty_struct *tty, struct file *file)
3615 struct e100_serial *info = (struct e100_serial *)tty->driver_data;
3616 unsigned int result;
3617 unsigned long flags;
3619 local_irq_save(flags);
3622 (!E100_RTS_GET(info) ? TIOCM_RTS : 0)
3623 | (!E100_DTR_GET(info) ? TIOCM_DTR : 0)
3624 | (!E100_RI_GET(info) ? TIOCM_RNG : 0)
3625 | (!E100_DSR_GET(info) ? TIOCM_DSR : 0)
3626 | (!E100_CD_GET(info) ? TIOCM_CAR : 0)
3627 | (!E100_CTS_GET(info) ? TIOCM_CTS : 0);
3629 local_irq_restore(flags);
3631 #ifdef SERIAL_DEBUG_IO
3632 printk(KERN_DEBUG "ser%i: modem state: %i 0x%08X\n",
3633 info->line, result, result);
3637 get_control_state_str(result, s);
3638 printk(KERN_DEBUG "state: %s\n", s);
3647 rs_ioctl(struct tty_struct *tty, struct file * file,
3648 unsigned int cmd, unsigned long arg)
3650 struct e100_serial * info = (struct e100_serial *)tty->driver_data;
3652 if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
3653 (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGWILD) &&
3654 (cmd != TIOCSERSWILD) && (cmd != TIOCSERGSTRUCT)) {
3655 if (tty->flags & (1 << TTY_IO_ERROR))
3661 return get_serial_info(info,
3662 (struct serial_struct *) arg);
3664 return set_serial_info(info,
3665 (struct serial_struct *) arg);
3666 case TIOCSERGETLSR: /* Get line status register */
3667 return get_lsr_info(info, (unsigned int *) arg);
3669 case TIOCSERGSTRUCT:
3670 if (copy_to_user((struct e100_serial *) arg,
3671 info, sizeof(struct e100_serial)))
3675 #if defined(CONFIG_ETRAX_RS485)
3676 case TIOCSERSETRS485:
3678 struct rs485_control rs485ctrl;
3679 if (copy_from_user(&rs485ctrl, (struct rs485_control *)arg,
3683 return e100_enable_rs485(tty, &rs485ctrl);
3686 case TIOCSERWRRS485:
3688 struct rs485_write rs485wr;
3689 if (copy_from_user(&rs485wr, (struct rs485_write *)arg,
3693 return e100_write_rs485(tty, rs485wr.outc, rs485wr.outc_size);
3698 return -ENOIOCTLCMD;
3704 rs_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
3706 struct e100_serial *info = (struct e100_serial *)tty->driver_data;
3710 /* Handle turning off CRTSCTS */
3711 if ((old_termios->c_cflag & CRTSCTS) &&
3712 !(tty->termios->c_cflag & CRTSCTS)) {
3713 tty->hw_stopped = 0;
3720 * ------------------------------------------------------------
3723 * This routine is called when the serial port gets closed. First, we
3724 * wait for the last remaining data to be sent. Then, we unlink its
3725 * S structure from the interrupt chain if necessary, and we free
3726 * that IRQ if nothing is left in the chain.
3727 * ------------------------------------------------------------
3730 rs_close(struct tty_struct *tty, struct file * filp)
3732 struct e100_serial * info = (struct e100_serial *)tty->driver_data;
3733 unsigned long flags;
3738 /* interrupts are disabled for this entire function */
3740 local_irq_save(flags);
3742 if (tty_hung_up_p(filp)) {
3743 local_irq_restore(flags);
3747 #ifdef SERIAL_DEBUG_OPEN
3748 printk("[%d] rs_close ttyS%d, count = %d\n", current->pid,
3749 info->line, info->count);
3751 if ((tty->count == 1) && (info->count != 1)) {
3753 * Uh, oh. tty->count is 1, which means that the tty
3754 * structure will be freed. Info->count should always
3755 * be one in these conditions. If it's greater than
3756 * one, we've got real problems, since it means the
3757 * serial port won't be shutdown.
3760 "rs_close: bad serial port count; tty->count is 1, "
3761 "info->count is %d\n", info->count);
3764 if (--info->count < 0) {
3765 printk(KERN_CRIT "rs_close: bad serial port count for ttyS%d: %d\n",
3766 info->line, info->count);
3770 local_irq_restore(flags);
3773 info->flags |= ASYNC_CLOSING;
3775 * Save the termios structure, since this port may have
3776 * separate termios for callout and dialin.
3778 if (info->flags & ASYNC_NORMAL_ACTIVE)
3779 info->normal_termios = *tty->termios;
3781 * Now we wait for the transmit buffer to clear; and we notify
3782 * the line discipline to only process XON/XOFF characters.
3785 if (info->closing_wait != ASYNC_CLOSING_WAIT_NONE)
3786 tty_wait_until_sent(tty, info->closing_wait);
3788 * At this point we stop accepting input. To do this, we
3789 * disable the serial receiver and the DMA receive interrupt.
3791 #ifdef SERIAL_HANDLE_EARLY_ERRORS
3792 e100_disable_serial_data_irq(info);
3795 #ifndef CONFIG_SVINTO_SIM
3796 e100_disable_rx(info);
3797 e100_disable_rx_irq(info);
3799 if (info->flags & ASYNC_INITIALIZED) {
3801 * Before we drop DTR, make sure the UART transmitter
3802 * has completely drained; this is especially
3803 * important as we have a transmit FIFO!
3805 rs_wait_until_sent(tty, HZ);
3810 rs_flush_buffer(tty);
3811 tty_ldisc_flush(tty);
3815 if (info->blocked_open) {
3816 if (info->close_delay)
3817 schedule_timeout_interruptible(info->close_delay);
3818 wake_up_interruptible(&info->open_wait);
3820 info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
3821 wake_up_interruptible(&info->close_wait);
3822 local_irq_restore(flags);
3826 #if defined(CONFIG_ETRAX_RS485)
3827 if (info->rs485.enabled) {
3828 info->rs485.enabled = 0;
3829 #if defined(CONFIG_ETRAX_RS485_ON_PA)
3830 *R_PORT_PA_DATA = port_pa_data_shadow &= ~(1 << rs485_pa_bit);
3832 #if defined(CONFIG_ETRAX_RS485_ON_PORT_G)
3833 REG_SHADOW_SET(R_PORT_G_DATA, port_g_data_shadow,
3834 rs485_port_g_bit, 0);
3836 #if defined(CONFIG_ETRAX_RS485_LTC1387)
3837 REG_SHADOW_SET(R_PORT_G_DATA, port_g_data_shadow,
3838 CONFIG_ETRAX_RS485_LTC1387_DXEN_PORT_G_BIT, 0);
3839 REG_SHADOW_SET(R_PORT_G_DATA, port_g_data_shadow,
3840 CONFIG_ETRAX_RS485_LTC1387_RXEN_PORT_G_BIT, 0);
3846 * Release any allocated DMA irq's.
3848 if (info->dma_in_enabled) {
3849 free_irq(info->dma_in_irq_nbr, info);
3850 cris_free_dma(info->dma_in_nbr, info->dma_in_irq_description);
3851 info->uses_dma_in = 0;
3852 #ifdef SERIAL_DEBUG_OPEN
3853 printk(KERN_DEBUG "DMA irq '%s' freed\n",
3854 info->dma_in_irq_description);
3857 if (info->dma_out_enabled) {
3858 free_irq(info->dma_out_irq_nbr, info);
3859 cris_free_dma(info->dma_out_nbr, info->dma_out_irq_description);
3860 info->uses_dma_out = 0;
3861 #ifdef SERIAL_DEBUG_OPEN
3862 printk(KERN_DEBUG "DMA irq '%s' freed\n",
3863 info->dma_out_irq_description);
3869 * rs_wait_until_sent() --- wait until the transmitter is empty
3871 static void rs_wait_until_sent(struct tty_struct *tty, int timeout)
3873 unsigned long orig_jiffies;
3874 struct e100_serial *info = (struct e100_serial *)tty->driver_data;
3875 unsigned long curr_time = jiffies;
3876 unsigned long curr_time_usec = GET_JIFFIES_USEC();
3878 (curr_time - info->last_tx_active) * (1000000/HZ) +
3879 curr_time_usec - info->last_tx_active_usec;
3882 * Check R_DMA_CHx_STATUS bit 0-6=number of available bytes in FIFO
3883 * R_DMA_CHx_HWSW bit 31-16=nbr of bytes left in DMA buffer (0=64k)
3886 orig_jiffies = jiffies;
3887 while (info->xmit.head != info->xmit.tail || /* More in send queue */
3888 (*info->ostatusadr & 0x007f) || /* more in FIFO */
3889 (elapsed_usec < 2*info->char_time_usec)) {
3890 schedule_timeout_interruptible(1);
3891 if (signal_pending(current))
3893 if (timeout && time_after(jiffies, orig_jiffies + timeout))
3895 curr_time = jiffies;
3896 curr_time_usec = GET_JIFFIES_USEC();
3898 (curr_time - info->last_tx_active) * (1000000/HZ) +
3899 curr_time_usec - info->last_tx_active_usec;
3901 set_current_state(TASK_RUNNING);
3906 * rs_hangup() --- called by tty_hangup() when a hangup is signaled.
3909 rs_hangup(struct tty_struct *tty)
3911 struct e100_serial * info = (struct e100_serial *)tty->driver_data;
3913 rs_flush_buffer(tty);
3917 info->flags &= ~ASYNC_NORMAL_ACTIVE;
3919 wake_up_interruptible(&info->open_wait);
3923 * ------------------------------------------------------------
3924 * rs_open() and friends
3925 * ------------------------------------------------------------
3928 block_til_ready(struct tty_struct *tty, struct file * filp,
3929 struct e100_serial *info)
3931 DECLARE_WAITQUEUE(wait, current);
3932 unsigned long flags;
3934 int do_clocal = 0, extra_count = 0;
3937 * If the device is in the middle of being closed, then block
3938 * until it's done, and then try again.
3940 if (tty_hung_up_p(filp) ||
3941 (info->flags & ASYNC_CLOSING)) {
3942 wait_event_interruptible(info->close_wait,
3943 !(info->flags & ASYNC_CLOSING));
3944 #ifdef SERIAL_DO_RESTART
3945 if (info->flags & ASYNC_HUP_NOTIFY)
3948 return -ERESTARTSYS;
3955 * If non-blocking mode is set, or the port is not enabled,
3956 * then make the check up front and then exit.
3958 if ((filp->f_flags & O_NONBLOCK) ||
3959 (tty->flags & (1 << TTY_IO_ERROR))) {
3960 info->flags |= ASYNC_NORMAL_ACTIVE;
3964 if (tty->termios->c_cflag & CLOCAL) {
3969 * Block waiting for the carrier detect and the line to become
3970 * free (i.e., not in use by the callout). While we are in
3971 * this loop, info->count is dropped by one, so that
3972 * rs_close() knows when to free things. We restore it upon
3973 * exit, either normal or abnormal.
3976 add_wait_queue(&info->open_wait, &wait);
3977 #ifdef SERIAL_DEBUG_OPEN
3978 printk("block_til_ready before block: ttyS%d, count = %d\n",
3979 info->line, info->count);
3981 local_irq_save(flags);
3982 if (!tty_hung_up_p(filp)) {
3986 local_irq_restore(flags);
3987 info->blocked_open++;
3989 local_irq_save(flags);
3990 /* assert RTS and DTR */
3993 local_irq_restore(flags);
3994 set_current_state(TASK_INTERRUPTIBLE);
3995 if (tty_hung_up_p(filp) ||
3996 !(info->flags & ASYNC_INITIALIZED)) {
3997 #ifdef SERIAL_DO_RESTART
3998 if (info->flags & ASYNC_HUP_NOTIFY)
4001 retval = -ERESTARTSYS;
4007 if (!(info->flags & ASYNC_CLOSING) && do_clocal)
4008 /* && (do_clocal || DCD_IS_ASSERTED) */
4010 if (signal_pending(current)) {
4011 retval = -ERESTARTSYS;
4014 #ifdef SERIAL_DEBUG_OPEN
4015 printk("block_til_ready blocking: ttyS%d, count = %d\n",
4016 info->line, info->count);
4020 set_current_state(TASK_RUNNING);
4021 remove_wait_queue(&info->open_wait, &wait);
4024 info->blocked_open--;
4025 #ifdef SERIAL_DEBUG_OPEN
4026 printk("block_til_ready after blocking: ttyS%d, count = %d\n",
4027 info->line, info->count);
4031 info->flags |= ASYNC_NORMAL_ACTIVE;
4036 deinit_port(struct e100_serial *info)
4038 if (info->dma_out_enabled) {
4039 cris_free_dma(info->dma_out_nbr, info->dma_out_irq_description);
4040 free_irq(info->dma_out_irq_nbr, info);
4042 if (info->dma_in_enabled) {
4043 cris_free_dma(info->dma_in_nbr, info->dma_in_irq_description);
4044 free_irq(info->dma_in_irq_nbr, info);
4049 * This routine is called whenever a serial port is opened.
4050 * It performs the serial-specific initialization for the tty structure.
4053 rs_open(struct tty_struct *tty, struct file * filp)
4055 struct e100_serial *info;
4058 int allocated_resources = 0;
4060 /* find which port we want to open */
4063 if (line < 0 || line >= NR_PORTS)
4066 /* find the corresponding e100_serial struct in the table */
4067 info = rs_table + line;
4069 /* don't allow the opening of ports that are not enabled in the HW config */
4073 #ifdef SERIAL_DEBUG_OPEN
4074 printk("[%d] rs_open %s, count = %d\n", current->pid, tty->name,
4079 tty->driver_data = info;
4082 info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
4085 page = get_zeroed_page(GFP_KERNEL);
4092 tmp_buf = (unsigned char *) page;
4096 * If the port is in the middle of closing, bail out now
4098 if (tty_hung_up_p(filp) ||
4099 (info->flags & ASYNC_CLOSING)) {
4100 wait_event_interruptible(info->close_wait,
4101 !(info->flags & ASYNC_CLOSING));
4102 #ifdef SERIAL_DO_RESTART
4103 return ((info->flags & ASYNC_HUP_NOTIFY) ?
4104 -EAGAIN : -ERESTARTSYS);
4111 * If DMA is enabled try to allocate the irq's.
4113 if (info->count == 1) {
4114 allocated_resources = 1;
4115 if (info->dma_in_enabled) {
4116 if (request_irq(info->dma_in_irq_nbr,
4118 info->dma_in_irq_flags,
4119 info->dma_in_irq_description,
4121 printk(KERN_WARNING "DMA irq '%s' busy; "
4122 "falling back to non-DMA mode\n",
4123 info->dma_in_irq_description);
4124 /* Make sure we never try to use DMA in */
4125 /* for the port again. */
4126 info->dma_in_enabled = 0;
4127 } else if (cris_request_dma(info->dma_in_nbr,
4128 info->dma_in_irq_description,
4129 DMA_VERBOSE_ON_ERROR,
4131 free_irq(info->dma_in_irq_nbr, info);
4132 printk(KERN_WARNING "DMA '%s' busy; "
4133 "falling back to non-DMA mode\n",
4134 info->dma_in_irq_description);
4135 /* Make sure we never try to use DMA in */
4136 /* for the port again. */
4137 info->dma_in_enabled = 0;
4139 #ifdef SERIAL_DEBUG_OPEN
4141 printk(KERN_DEBUG "DMA irq '%s' allocated\n",
4142 info->dma_in_irq_description);
4145 if (info->dma_out_enabled) {
4146 if (request_irq(info->dma_out_irq_nbr,
4148 info->dma_out_irq_flags,
4149 info->dma_out_irq_description,
4151 printk(KERN_WARNING "DMA irq '%s' busy; "
4152 "falling back to non-DMA mode\n",
4153 info->dma_out_irq_description);
4154 /* Make sure we never try to use DMA out */
4155 /* for the port again. */
4156 info->dma_out_enabled = 0;
4157 } else if (cris_request_dma(info->dma_out_nbr,
4158 info->dma_out_irq_description,
4159 DMA_VERBOSE_ON_ERROR,
4161 free_irq(info->dma_out_irq_nbr, info);
4162 printk(KERN_WARNING "DMA '%s' busy; "
4163 "falling back to non-DMA mode\n",
4164 info->dma_out_irq_description);
4165 /* Make sure we never try to use DMA out */
4166 /* for the port again. */
4167 info->dma_out_enabled = 0;
4169 #ifdef SERIAL_DEBUG_OPEN
4171 printk(KERN_DEBUG "DMA irq '%s' allocated\n",
4172 info->dma_out_irq_description);
4178 * Start up the serial port
4181 retval = startup(info);
4183 if (allocated_resources)
4186 /* FIXME Decrease count info->count here too? */
4191 retval = block_til_ready(tty, filp, info);
4193 #ifdef SERIAL_DEBUG_OPEN
4194 printk("rs_open returning after block_til_ready with %d\n",
4197 if (allocated_resources)
4203 if ((info->count == 1) && (info->flags & ASYNC_SPLIT_TERMIOS)) {
4204 *tty->termios = info->normal_termios;
4208 #ifdef SERIAL_DEBUG_OPEN
4209 printk("rs_open ttyS%d successful...\n", info->line);
4211 DLOG_INT_TRIG( log_int_pos = 0);
4213 DFLIP( if (info->line == SERIAL_DEBUG_LINE) {
4214 info->icount.rx = 0;
4221 * /proc fs routines....
4224 static int line_info(char *buf, struct e100_serial *info)
4230 ret = sprintf(buf, "%d: uart:E100 port:%lX irq:%d",
4231 info->line, (unsigned long)info->port, info->irq);
4233 if (!info->port || (info->type == PORT_UNKNOWN)) {
4234 ret += sprintf(buf+ret, "\n");
4240 if (!E100_RTS_GET(info))
4241 strcat(stat_buf, "|RTS");
4242 if (!E100_CTS_GET(info))
4243 strcat(stat_buf, "|CTS");
4244 if (!E100_DTR_GET(info))
4245 strcat(stat_buf, "|DTR");
4246 if (!E100_DSR_GET(info))
4247 strcat(stat_buf, "|DSR");
4248 if (!E100_CD_GET(info))
4249 strcat(stat_buf, "|CD");
4250 if (!E100_RI_GET(info))
4251 strcat(stat_buf, "|RI");
4253 ret += sprintf(buf+ret, " baud:%d", info->baud);
4255 ret += sprintf(buf+ret, " tx:%lu rx:%lu",
4256 (unsigned long)info->icount.tx,
4257 (unsigned long)info->icount.rx);
4258 tmp = CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
4260 ret += sprintf(buf+ret, " tx_pend:%lu/%lu",
4262 (unsigned long)SERIAL_XMIT_SIZE);
4265 ret += sprintf(buf+ret, " rx_pend:%lu/%lu",
4266 (unsigned long)info->recv_cnt,
4267 (unsigned long)info->max_recv_cnt);
4272 if (info->tty->stopped)
4273 ret += sprintf(buf+ret, " stopped:%i",
4274 (int)info->tty->stopped);
4275 if (info->tty->hw_stopped)
4276 ret += sprintf(buf+ret, " hw_stopped:%i",
4277 (int)info->tty->hw_stopped);
4281 unsigned char rstat = info->port[REG_STATUS];
4282 if (rstat & IO_MASK(R_SERIAL0_STATUS, xoff_detect) )
4283 ret += sprintf(buf+ret, " xoff_detect:1");
4291 if (info->icount.frame)
4292 ret += sprintf(buf+ret, " fe:%lu",
4293 (unsigned long)info->icount.frame);
4295 if (info->icount.parity)
4296 ret += sprintf(buf+ret, " pe:%lu",
4297 (unsigned long)info->icount.parity);
4299 if (info->icount.brk)
4300 ret += sprintf(buf+ret, " brk:%lu",
4301 (unsigned long)info->icount.brk);
4303 if (info->icount.overrun)
4304 ret += sprintf(buf+ret, " oe:%lu",
4305 (unsigned long)info->icount.overrun);
4308 * Last thing is the RS-232 status lines
4310 ret += sprintf(buf+ret, " %s\n", stat_buf+1);
4314 int rs_read_proc(char *page, char **start, off_t off, int count,
4315 int *eof, void *data)
4320 len += sprintf(page, "serinfo:1.0 driver:%s\n",
4322 for (i = 0; i < NR_PORTS && len < 4000; i++) {
4323 if (!rs_table[i].enabled)
4325 l = line_info(page + len, &rs_table[i]);
4327 if (len+begin > off+count)
4329 if (len+begin < off) {
4334 #ifdef DEBUG_LOG_INCLUDED
4335 for (i = 0; i < debug_log_pos; i++) {
4336 len += sprintf(page + len, "%-4i %lu.%lu ", i, debug_log[i].time, timer_data_to_ns(debug_log[i].timer_data));
4337 len += sprintf(page + len, debug_log[i].string, debug_log[i].value);
4338 if (len+begin > off+count)
4340 if (len+begin < off) {
4345 len += sprintf(page + len, "debug_log %i/%i %li bytes\n",
4346 i, DEBUG_LOG_SIZE, begin+len);
4352 if (off >= len+begin)
4354 *start = page + (off-begin);
4355 return ((count < begin+len-off) ? count : begin+len-off);
4358 /* Finally, routines used to initialize the serial driver. */
4361 show_serial_version(void)
4364 "ETRAX 100LX serial-driver %s, (c) 2000-2004 Axis Communications AB\r\n",
4365 &serial_version[11]); /* "$Revision: x.yy" */
4368 /* rs_init inits the driver at boot (using the module_init chain) */
4370 static const struct tty_operations rs_ops = {
4374 .flush_chars = rs_flush_chars,
4375 .write_room = rs_write_room,
4376 .chars_in_buffer = rs_chars_in_buffer,
4377 .flush_buffer = rs_flush_buffer,
4379 .throttle = rs_throttle,
4380 .unthrottle = rs_unthrottle,
4381 .set_termios = rs_set_termios,
4384 .hangup = rs_hangup,
4385 .break_ctl = rs_break,
4386 .send_xchar = rs_send_xchar,
4387 .wait_until_sent = rs_wait_until_sent,
4388 .read_proc = rs_read_proc,
4389 .tiocmget = rs_tiocmget,
4390 .tiocmset = rs_tiocmset
4397 struct e100_serial *info;
4398 struct tty_driver *driver = alloc_tty_driver(NR_PORTS);
4403 show_serial_version();
4405 /* Setup the timed flush handler system */
4407 #if !defined(CONFIG_ETRAX_SERIAL_FAST_TIMER)
4408 setup_timer(&flush_timer, timed_flush_handler, 0);
4409 mod_timer(&flush_timer, jiffies + 5);
4412 #if defined(CONFIG_ETRAX_RS485)
4413 #if defined(CONFIG_ETRAX_RS485_ON_PA)
4414 if (cris_io_interface_allocate_pins(if_ser0, 'a', rs485_pa_bit,
4416 printk(KERN_CRIT "ETRAX100LX serial: Could not allocate "
4421 #if defined(CONFIG_ETRAX_RS485_ON_PORT_G)
4422 if (cris_io_interface_allocate_pins(if_ser0, 'g', rs485_pa_bit,
4423 rs485_port_g_bit)) {
4424 printk(KERN_CRIT "ETRAX100LX serial: Could not allocate "
4431 /* Initialize the tty_driver structure */
4433 driver->driver_name = "serial";
4434 driver->name = "ttyS";
4435 driver->major = TTY_MAJOR;
4436 driver->minor_start = 64;
4437 driver->type = TTY_DRIVER_TYPE_SERIAL;
4438 driver->subtype = SERIAL_TYPE_NORMAL;
4439 driver->init_termios = tty_std_termios;
4440 driver->init_termios.c_cflag =
4441 B115200 | CS8 | CREAD | HUPCL | CLOCAL; /* is normally B9600 default... */
4442 driver->init_termios.c_ispeed = 115200;
4443 driver->init_termios.c_ospeed = 115200;
4444 driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
4445 driver->termios = serial_termios;
4446 driver->termios_locked = serial_termios_locked;
4448 tty_set_operations(driver, &rs_ops);
4449 serial_driver = driver;
4450 if (tty_register_driver(driver))
4451 panic("Couldn't register serial driver\n");
4452 /* do some initializing for the separate ports */
4454 for (i = 0, info = rs_table; i < NR_PORTS; i++,info++) {
4455 if (info->enabled) {
4456 if (cris_request_io_interface(info->io_if,
4457 info->io_if_description)) {
4458 printk(KERN_CRIT "ETRAX100LX async serial: "
4459 "Could not allocate IO pins for "
4461 info->io_if_description, i);
4465 info->uses_dma_in = 0;
4466 info->uses_dma_out = 0;
4469 info->type = PORT_ETRAX;
4470 info->tr_running = 0;
4471 info->forced_eop = 0;
4472 info->baud_base = DEF_BAUD_BASE;
4473 info->custom_divisor = 0;
4475 info->close_delay = 5*HZ/10;
4476 info->closing_wait = 30*HZ;
4480 info->blocked_open = 0;
4481 info->normal_termios = driver->init_termios;
4482 init_waitqueue_head(&info->open_wait);
4483 init_waitqueue_head(&info->close_wait);
4484 info->xmit.buf = NULL;
4485 info->xmit.tail = info->xmit.head = 0;
4486 info->first_recv_buffer = info->last_recv_buffer = NULL;
4487 info->recv_cnt = info->max_recv_cnt = 0;
4488 info->last_tx_active_usec = 0;
4489 info->last_tx_active = 0;
4491 #if defined(CONFIG_ETRAX_RS485)
4492 /* Set sane defaults */
4493 info->rs485.rts_on_send = 0;
4494 info->rs485.rts_after_sent = 1;
4495 info->rs485.delay_rts_before_send = 0;
4496 info->rs485.enabled = 0;
4498 INIT_WORK(&info->work, do_softint);
4500 if (info->enabled) {
4501 printk(KERN_INFO "%s%d at 0x%x is a builtin UART with DMA\n",
4502 serial_driver->name, info->line, (unsigned int)info->port);
4505 #ifdef CONFIG_ETRAX_FAST_TIMER
4506 #ifdef CONFIG_ETRAX_SERIAL_FAST_TIMER
4507 memset(fast_timers, 0, sizeof(fast_timers));
4509 #ifdef CONFIG_ETRAX_RS485
4510 memset(fast_timers_rs485, 0, sizeof(fast_timers_rs485));
4515 #ifndef CONFIG_SVINTO_SIM
4516 #ifndef CONFIG_ETRAX_KGDB
4517 /* Not needed in simulator. May only complicate stuff. */
4518 /* hook the irq's for DMA channel 6 and 7, serial output and input, and some more... */
4520 if (request_irq(SERIAL_IRQ_NBR, ser_interrupt,
4521 IRQF_SHARED | IRQF_DISABLED, "serial ", driver))
4522 panic("%s: Failed to request irq8", __func__);
4525 #endif /* CONFIG_SVINTO_SIM */
4530 /* this makes sure that rs_init is called during kernel boot */
4532 module_init(rs_init);