1 /* $Id: serial.c,v 1.25 2004/09/29 10:33:49 starvik Exp $
3 * Serial port driver for the ETRAX 100LX chip
5 * Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003 Axis Communications AB
7 * Many, many authors. Based once upon a time on serial.c for 16x50.
10 * Revision 1.25 2004/09/29 10:33:49 starvik
11 * Resolved a dealock when printing debug from kernel.
13 * Revision 1.24 2004/08/27 23:25:59 johana
14 * rs_set_termios() must call change_speed() if c_iflag has changed or
15 * automatic XOFF handling will be enabled and transmitter will stop
16 * if 0x13 is received.
18 * Revision 1.23 2004/08/24 06:57:13 starvik
19 * More whitespace cleanup
21 * Revision 1.22 2004/08/24 06:12:20 starvik
24 * Revision 1.20 2004/05/24 12:00:20 starvik
25 * Big merge of stuff from Linux 2.4 (e.g. manual mode for the serial port).
27 * Revision 1.19 2004/05/17 13:12:15 starvik
29 * Big merge from Linux 2.4 still pending.
31 * Revision 1.18 2003/10/28 07:18:30 starvik
32 * Compiles with debug info
34 * Revision 1.17 2003/07/04 08:27:37 starvik
35 * Merge of Linux 2.5.74
37 * Revision 1.16 2003/06/13 10:05:19 johana
38 * Help the user to avoid trouble by:
39 * Forcing mixed mode for status/control lines if not all pins are used.
41 * Revision 1.15 2003/06/13 09:43:01 johana
42 * Merged in the following changes from os/linux/arch/cris/drivers/serial.c
43 * + some minor changes to reduce diff.
45 * Revision 1.49 2003/05/30 11:31:54 johana
46 * Merged in change-branch--serial9bit that adds CMSPAR support for sticky
49 * Revision 1.48 2003/05/30 11:03:57 johana
50 * Implemented rs_send_xchar() by disabling the DMA and writing manually.
51 * Added e100_disable_txdma_channel() and e100_enable_txdma_channel().
52 * Fixed rs_throttle() and rs_unthrottle() to properly call rs_send_xchar
53 * instead of setting info->x_char and check the CRTSCTS flag before
54 * controlling the rts pin.
56 * Revision 1.14 2003/04/09 08:12:44 pkj
57 * Corrected typo changes made upstream.
59 * Revision 1.13 2003/04/09 05:20:47 starvik
60 * Merge of Linux 2.5.67
62 * Revision 1.11 2003/01/22 06:48:37 starvik
63 * Fixed warnings issued by GCC 3.2.1
65 * Revision 1.9 2002/12/13 09:07:47 starvik
66 * Alert user that RX_TIMEOUT_TICKS==0 doesn't work
68 * Revision 1.8 2002/12/11 13:13:57 starvik
69 * Added arch/ to v10 specific includes
70 * Added fix from Linux 2.4 in serial.c (flush_to_flip_buffer)
72 * Revision 1.7 2002/12/06 07:13:57 starvik
73 * Corrected work queue stuff
74 * Removed CONFIG_ETRAX_SERIAL_FLUSH_DMA_FAST
76 * Revision 1.6 2002/11/21 07:17:46 starvik
77 * Change static inline to extern inline where otherwise outlined with gcc-3.2
79 * Revision 1.5 2002/11/14 15:59:49 starvik
80 * Linux 2.5 port of the latest serial driver from 2.4. The work queue stuff
81 * probably doesn't work yet.
83 * Revision 1.42 2002/11/05 09:08:47 johana
84 * Better implementation of rs_stop() and rs_start() that uses the XOFF
85 * register to start/stop transmission.
86 * change_speed() also initilises XOFF register correctly so that
87 * auto_xoff is enabled when IXON flag is set by user.
88 * This gives fast XOFF response times.
90 * Revision 1.41 2002/11/04 18:40:57 johana
91 * Implemented rs_stop() and rs_start().
92 * Simple tests using hwtestserial indicates that this should be enough
95 * Revision 1.40 2002/10/14 05:33:18 starvik
96 * RS-485 uses fast timers even if SERIAL_FAST_TIMER is disabled
98 * Revision 1.39 2002/09/30 21:00:57 johana
99 * Support for CONFIG_ETRAX_SERx_DTR_RI_DSR_CD_MIXED where the status and
100 * control pins can be mixed between PA and PB.
101 * If no serial port uses MIXED old solution is used
102 * (saves a few bytes and cycles).
103 * control_pins struct uses masks instead of bit numbers.
104 * Corrected dummy values and polarity in line_info() so
105 * /proc/tty/driver/serial is now correct.
106 * (the E100_xxx_GET() macros is really active low - perhaps not obvious)
108 * Revision 1.38 2002/08/23 11:01:36 starvik
109 * Check that serial port is enabled in all interrupt handlers to avoid
110 * restarts of DMA channels not assigned to serial ports
112 * Revision 1.37 2002/08/13 13:02:37 bjornw
113 * Removed some warnings because of unused code
115 * Revision 1.36 2002/08/08 12:50:01 starvik
116 * Serial interrupt is shared with synchronous serial port driver
118 * Revision 1.35 2002/06/03 10:40:49 starvik
119 * Increased RS-485 RTS toggle timer to 2 characters
121 * Revision 1.34 2002/05/28 18:59:36 johana
122 * Whitespace and comment fixing to be more like etrax100ser.c 1.71.
124 * Revision 1.33 2002/05/28 17:55:43 johana
125 * RS-485 uses FAST_TIMER if enabled, and starts a short (one char time)
126 * timer from tranismit_chars (interrupt context).
127 * The timer toggles RTS in interrupt context when expired giving minimum
130 * Revision 1.32 2002/05/22 13:58:00 johana
131 * Renamed rs_write() to raw_write() and made it inline.
132 * New rs_write() handles RS-485 if configured and enabled
133 * (moved code from e100_write_rs485()).
134 * RS-485 ioctl's uses copy_from_user() instead of verify_area().
136 * Revision 1.31 2002/04/22 11:20:03 johana
137 * Updated copyright years.
139 * Revision 1.30 2002/04/22 09:39:12 johana
140 * RS-485 support compiles.
142 * Revision 1.29 2002/01/14 16:10:01 pkj
143 * Allocate the receive buffers dynamically. The static 4kB buffer was
144 * too small for the peaks. This means that we can get rid of the extra
145 * buffer and the copying to it. It also means we require less memory
146 * under normal operations, but can use more when needed (there is a
147 * cap at 64kB for safety reasons). If there is no memory available
148 * we panic(), and die a horrible death...
150 * Revision 1.28 2001/12/18 15:04:53 johana
151 * Cleaned up write_rs485() - now it works correctly without padding extra
153 * Added sane default initialisation of rs485.
154 * Added #ifdef around dummy variables.
156 * Revision 1.27 2001/11/29 17:00:41 pkj
157 * 2kB seems to be too small a buffer when using 921600 bps,
158 * so increase it to 4kB (this was already done for the elinux
159 * version of the serial driver).
161 * Revision 1.26 2001/11/19 14:20:41 pkj
162 * Minor changes to comments and unused code.
164 * Revision 1.25 2001/11/12 20:03:43 pkj
165 * Fixed compiler warnings.
167 * Revision 1.24 2001/11/12 15:10:05 pkj
168 * Total redesign of the receiving part of the serial driver.
169 * Uses eight chained descriptors to write to a 4kB buffer.
170 * This data is then serialised into a 2kB buffer. From there it
171 * is copied into the TTY's flip buffers when they become available.
172 * A lot of copying, and the sizes of the buffers might need to be
173 * tweaked, but all in all it should work better than the previous
174 * version, without the need to modify the TTY code in any way.
175 * Also note that erroneous bytes are now correctly marked in the
176 * flag buffers (instead of always marking the first byte).
178 * Revision 1.23 2001/10/30 17:53:26 pkj
179 * * Set info->uses_dma to 0 when a port is closed.
180 * * Mark the timer1 interrupt as a fast one (SA_INTERRUPT).
181 * * Call start_flush_timer() in start_receive() if
182 * CONFIG_ETRAX_SERIAL_FLUSH_DMA_FAST is defined.
184 * Revision 1.22 2001/10/30 17:44:03 pkj
185 * Use %lu for received and transmitted counters in line_info().
187 * Revision 1.21 2001/10/30 17:40:34 pkj
188 * Clean-up. The only change to functionality is that
189 * CONFIG_ETRAX_SERIAL_RX_TIMEOUT_TICKS(=5) is used instead of
190 * MAX_FLUSH_TIME(=8).
192 * Revision 1.20 2001/10/30 15:24:49 johana
193 * Added char_time stuff from 2.0 driver.
195 * Revision 1.19 2001/10/30 15:23:03 johana
196 * Merged with 1.13.2 branch + fixed indentation
197 * and changed CONFIG_ETRAX100_XYS to CONFIG_ETRAX_XYZ
199 * Revision 1.18 2001/09/24 09:27:22 pkj
200 * Completed ext_baud_table[] in cflag_to_baud() and cflag_to_etrax_baud().
202 * Revision 1.17 2001/08/24 11:32:49 ronny
203 * More fixes for the CONFIG_ETRAX_SERIAL_PORT0 define.
205 * Revision 1.16 2001/08/24 07:56:22 ronny
206 * Added config ifdefs around ser0 irq requests.
208 * Revision 1.15 2001/08/16 09:10:31 bjarne
209 * serial.c - corrected the initialization of rs_table, the wrong defines
211 * Corrected a test in timed_flush_handler.
212 * Changed configured to enabled.
213 * serial.h - Changed configured to enabled.
215 * Revision 1.14 2001/08/15 07:31:23 bjarne
216 * Introduced two new members to the e100_serial struct.
217 * configured - Will be set to 1 if the port has been configured in .config
218 * uses_dma - Should be set to 1 if the port uses DMA. Currently it is set
220 * when a port is opened. This is used to limit the DMA interrupt
221 * routines to only manipulate DMA channels actually used by the
224 * Revision 1.13.2.2 2001/10/17 13:57:13 starvik
225 * Receiver was broken by the break fixes
227 * Revision 1.13.2.1 2001/07/20 13:57:39 ronny
228 * Merge with new stuff from etrax100ser.c. Works but haven't checked stuff
229 * like break handling.
231 * Revision 1.13 2001/05/09 12:40:31 johana
232 * Use DMA_NBR and IRQ_NBR defines from dma.h and irq.h
234 * Revision 1.12 2001/04/19 12:23:07 bjornw
235 * CONFIG_RS485 -> CONFIG_ETRAX_RS485
237 * Revision 1.11 2001/04/05 14:29:48 markusl
238 * Updated according to review remarks i.e.
239 * -Use correct types in port structure to avoid compiler warnings
240 * -Try to use IO_* macros whenever possible
241 * -Open should never return -EBUSY
243 * Revision 1.10 2001/03/05 13:14:07 bjornw
244 * Another spelling fix
246 * Revision 1.9 2001/02/23 13:46:38 bjornw
249 * Revision 1.8 2001/01/23 14:56:35 markusl
250 * Made use of ser1 optional
253 * Revision 1.7 2001/01/19 16:14:48 perf
254 * Added kernel options for serial ports 234.
255 * Changed option names from CONFIG_ETRAX100_XYZ to CONFIG_ETRAX_XYZ.
257 * Revision 1.6 2000/11/22 16:36:09 bjornw
258 * Please marketing by using the correct case when spelling Etrax.
260 * Revision 1.5 2000/11/21 16:43:37 bjornw
261 * Fixed so it compiles under CONFIG_SVINTO_SIM
263 * Revision 1.4 2000/11/15 17:34:12 bjornw
264 * Added a timeout timer for flushing input channels. The interrupt-based
265 * fast flush system should be easy to merge with this later (works the same
266 * way, only with an irq instead of a system timer_list)
268 * Revision 1.3 2000/11/13 17:19:57 bjornw
269 * * Incredibly, this almost complete rewrite of serial.c worked (at least
270 * for output) the first time.
272 * Items worth noticing:
274 * No Etrax100 port 1 workarounds (does only compile on 2.4 anyway now)
275 * RS485 is not ported (why can't it be done in userspace as on x86 ?)
276 * Statistics done through async_icount - if any more stats are needed,
277 * that's the place to put them or in an arch-dep version of it.
278 * timeout_interrupt and the other fast timeout stuff not ported yet
279 * There be dragons in this 3k+ line driver
281 * Revision 1.2 2000/11/10 16:50:28 bjornw
282 * First shot at a 2.4 port, does not compile totally yet
284 * Revision 1.1 2000/11/10 16:47:32 bjornw
285 * Added verbatim copy of rev 1.49 etrax100ser.c from elinux
287 * Revision 1.49 2000/10/30 15:47:14 tobiasa
288 * Changed version number.
290 * Revision 1.48 2000/10/25 11:02:43 johana
291 * Changed %ul to %lu in printf's
293 * Revision 1.47 2000/10/18 15:06:53 pkj
294 * Compile correctly with CONFIG_ETRAX_SERIAL_FLUSH_DMA_FAST and
295 * CONFIG_ETRAX_SERIAL_PROC_ENTRY together.
296 * Some clean-up of the /proc/serial file.
298 * Revision 1.46 2000/10/16 12:59:40 johana
299 * Added CONFIG_ETRAX_SERIAL_PROC_ENTRY for statistics and debug info.
301 * Revision 1.45 2000/10/13 17:10:59 pkj
302 * Do not flush DMAs while flipping TTY buffers.
304 * Revision 1.44 2000/10/13 16:34:29 pkj
305 * Added a delay in ser_interrupt() for 2.3ms when an error is detected.
306 * We do not know why this delay is required yet, but without it the
307 * irmaflash program does not work (this was the program that needed
308 * the ser_interrupt() to be needed in the first place). This should not
309 * affect normal use of the serial ports.
311 * Revision 1.43 2000/10/13 16:30:44 pkj
312 * New version of the fast flush of serial buffers code. This time
313 * it is localized to the serial driver and uses a fast timer to
316 * Revision 1.42 2000/10/13 14:54:26 bennyo
317 * Fix for switching RTS when using rs485
319 * Revision 1.41 2000/10/12 11:43:44 pkj
320 * Cleaned up a number of comments.
322 * Revision 1.40 2000/10/10 11:58:39 johana
323 * Made RS485 support generic for all ports.
324 * Toggle rts in interrupt if no delay wanted.
325 * WARNING: No true transmitter empty check??
326 * Set d_wait bit when sending data so interrupt is delayed until
327 * fifo flushed. (Fix tcdrain() problem)
329 * Revision 1.39 2000/10/04 16:08:02 bjornw
330 * * Use virt_to_phys etc. for DMA addresses
331 * * Removed CONFIG_FLUSH_DMA_FAST hacks
334 * Revision 1.38 2000/10/02 12:27:10 mattias
335 * * added variable used when using fast flush on serial dma.
336 * (CONFIG_FLUSH_DMA_FAST)
338 * Revision 1.37 2000/09/27 09:44:24 pkj
339 * Uncomment definition of SERIAL_HANDLE_EARLY_ERRORS.
341 * Revision 1.36 2000/09/20 13:12:52 johana
342 * Support for CONFIG_ETRAX_SERIAL_RX_TIMEOUT_TICKS:
343 * Number of timer ticks between flush of receive fifo (1 tick = 10ms).
344 * Try 0-3 for low latency applications. Approx 5 for high load
345 * applications (e.g. PPP). Maybe this should be more adaptive some day...
347 * Revision 1.35 2000/09/20 10:36:08 johana
348 * Typo in get_lsr_info()
350 * Revision 1.34 2000/09/20 10:29:59 johana
351 * Let rs_chars_in_buffer() check fifo content as well.
352 * get_lsr_info() might work now (not tested).
353 * Easier to change the port to debug.
355 * Revision 1.33 2000/09/13 07:52:11 torbjore
358 * Revision 1.32 2000/08/31 14:45:37 bjornw
359 * After sending a break we need to reset the transmit DMA channel
361 * Revision 1.31 2000/06/21 12:13:29 johana
362 * Fixed wait for all chars sent when closing port.
363 * (Used to always take 1 second!)
364 * Added shadows for directions of status/ctrl signals.
366 * Revision 1.30 2000/05/29 16:27:55 bjornw
367 * Simulator ifdef moved a bit
369 * Revision 1.29 2000/05/09 09:40:30 mattias
370 * * Added description of dma registers used in timeout_interrupt
373 * Revision 1.28 2000/05/08 16:38:58 mattias
374 * * Bugfix for flushing fifo in timeout_interrupt
375 * Problem occurs when bluetooth stack waits for a small number of bytes
376 * containing an event acknowledging free buffers in bluetooth HW
377 * As before, data was stuck in fifo until more data came on uart and
378 * flushed it up to the stack.
380 * Revision 1.27 2000/05/02 09:52:28 jonasd
381 * Added fix for peculiar etrax behaviour when eop is forced on an empty
382 * fifo. This is used when flashing the IRMA chip. Disabled by default.
384 * Revision 1.26 2000/03/29 15:32:02 bjornw
387 * Revision 1.25 2000/02/16 16:59:36 bjornw
388 * * Receive DMA directly into the flip-buffer, eliminating an intermediary
389 * receive buffer and a memcpy. Will avoid some overruns.
390 * * Error message on debug port if an overrun or flip buffer overrun occurs.
391 * * Just use the first byte in the flag flip buffer for errors.
392 * * Check for timeout on the serial ports only each 5/100 s, not 1/100.
394 * Revision 1.24 2000/02/09 18:02:28 bjornw
395 * * Clear serial errors (overrun, framing, parity) correctly. Before, the
396 * receiver would get stuck if an error occurred and we did not restart
398 * * Cosmetics (indentation, some code made into inlines)
399 * * Some more debug options
400 * * Actually shut down the serial port (DMA irq, DMA reset, receiver stop)
401 * when the last open is closed. Corresponding fixes in startup().
402 * * rs_close() "tx FIFO wait" code moved into right place, bug & -> && fixed
403 * and make a special case out of port 1 (R_DMA_CHx_STATUS is broken for that)
404 * * e100_disable_rx/enable_rx just disables/enables the receiver, not RTS
406 * Revision 1.23 2000/01/24 17:46:19 johana
407 * Wait for flush of DMA/FIFO when closing port.
409 * Revision 1.22 2000/01/20 18:10:23 johana
410 * Added TIOCMGET ioctl to return modem status.
411 * Implemented modem status/control that works with the extra signals
412 * (DTR, DSR, RI,CD) as well.
413 * 3 different modes supported:
414 * ser0 on PB (Bundy), ser1 on PB (Lisa) and ser2 on PA (Bundy)
415 * Fixed DEF_TX value that caused the serial transmitter pin (txd) to go to 0 when
416 * closing the last filehandle, NASTY!.
417 * Added break generation, not tested though!
418 * Use SA_SHIRQ when request_irq() for ser2 and ser3 (shared with) par0 and par1.
419 * You can't use them at the same time (yet..), but you can hopefully switch
420 * between ser2/par0, ser3/par1 with the same kernel config.
421 * Replaced some magic constants with defines
426 static char *serial_version = "$Revision: 1.25 $";
428 #include <linux/config.h>
429 #include <linux/types.h>
430 #include <linux/errno.h>
431 #include <linux/signal.h>
432 #include <linux/sched.h>
433 #include <linux/timer.h>
434 #include <linux/interrupt.h>
435 #include <linux/tty.h>
436 #include <linux/tty_flip.h>
437 #include <linux/major.h>
438 #include <linux/string.h>
439 #include <linux/fcntl.h>
440 #include <linux/mm.h>
441 #include <linux/slab.h>
442 #include <linux/init.h>
443 #include <asm/uaccess.h>
444 #include <linux/kernel.h>
448 #include <asm/system.h>
449 #include <asm/bitops.h>
450 #include <linux/delay.h>
452 #include <asm/arch/svinto.h>
454 /* non-arch dependent serial structures are in linux/serial.h */
455 #include <linux/serial.h>
456 /* while we keep our own stuff (struct e100_serial) in a local .h file */
458 #include <asm/fasttimer.h>
460 #ifdef CONFIG_ETRAX_SERIAL_FAST_TIMER
461 #ifndef CONFIG_ETRAX_FAST_TIMER
462 #error "Enable FAST_TIMER to use SERIAL_FAST_TIMER"
466 #if defined(CONFIG_ETRAX_SERIAL_RX_TIMEOUT_TICKS) && \
467 (CONFIG_ETRAX_SERIAL_RX_TIMEOUT_TICKS == 0)
468 #error "RX_TIMEOUT_TICKS == 0 not allowed, use 1"
471 #if defined(CONFIG_ETRAX_RS485_ON_PA) && defined(CONFIG_ETRAX_RS485_ON_PORT_G)
472 #error "Disable either CONFIG_ETRAX_RS485_ON_PA or CONFIG_ETRAX_RS485_ON_PORT_G"
476 * All of the compatibilty code so we can compile serial.c against
477 * older kernels is hidden in serial_compat.h
479 #if defined(LOCAL_HEADERS)
480 #include "serial_compat.h"
483 #define _INLINE_ inline
485 struct tty_driver *serial_driver;
487 /* serial subtype definitions */
488 #ifndef SERIAL_TYPE_NORMAL
489 #define SERIAL_TYPE_NORMAL 1
492 /* number of characters left in xmit buffer before we ask for more */
493 #define WAKEUP_CHARS 256
495 //#define SERIAL_DEBUG_INTR
496 //#define SERIAL_DEBUG_OPEN
497 //#define SERIAL_DEBUG_FLOW
498 //#define SERIAL_DEBUG_DATA
499 //#define SERIAL_DEBUG_THROTTLE
500 //#define SERIAL_DEBUG_IO /* Debug for Extra control and status pins */
501 //#define SERIAL_DEBUG_LINE 0 /* What serport we want to debug */
503 /* Enable this to use serial interrupts to handle when you
504 expect the first received event on the serial port to
505 be an error, break or similar. Used to be able to flash IRMA
507 #define SERIAL_HANDLE_EARLY_ERRORS
509 /* Defined and used in n_tty.c, but we need it here as well */
510 #define TTY_THRESHOLD_THROTTLE 128
512 /* Due to buffersizes and threshold values, our SERIAL_DESCR_BUF_SIZE
513 * must not be to high or flow control won't work if we leave it to the tty
514 * layer so we have our own throttling in flush_to_flip
515 * TTY_FLIPBUF_SIZE=512,
516 * TTY_THRESHOLD_THROTTLE/UNTHROTTLE=128
517 * BUF_SIZE can't be > 128
519 /* Currently 16 descriptors x 128 bytes = 2048 bytes */
520 #define SERIAL_DESCR_BUF_SIZE 256
522 #define SERIAL_PRESCALE_BASE 3125000 /* 3.125MHz */
523 #define DEF_BAUD_BASE SERIAL_PRESCALE_BASE
525 /* We don't want to load the system with massive fast timer interrupt
526 * on high baudrates so limit it to 250 us (4kHz) */
527 #define MIN_FLUSH_TIME_USEC 250
529 /* Add an x here to log a lot of timer stuff */
531 /* Debug details of interrupt handling */
532 #define DINTR1(x) /* irq on/off, errors */
533 #define DINTR2(x) /* tx and rx */
534 /* Debug flip buffer stuff */
536 /* Debug flow control and overview of data flow */
539 #define DLOG_INT_TRIG(x)
541 //#define DEBUG_LOG_INCLUDED
542 #ifndef DEBUG_LOG_INCLUDED
543 #define DEBUG_LOG(line, string, value)
545 struct debug_log_info
548 unsigned long timer_data;
553 #define DEBUG_LOG_SIZE 4096
555 struct debug_log_info debug_log[DEBUG_LOG_SIZE];
556 int debug_log_pos = 0;
558 #define DEBUG_LOG(_line, _string, _value) do { \
559 if ((_line) == SERIAL_DEBUG_LINE) {\
560 debug_log_func(_line, _string, _value); \
564 void debug_log_func(int line, const char *string, int value)
566 if (debug_log_pos < DEBUG_LOG_SIZE) {
567 debug_log[debug_log_pos].time = jiffies;
568 debug_log[debug_log_pos].timer_data = *R_TIMER_DATA;
569 // debug_log[debug_log_pos].line = line;
570 debug_log[debug_log_pos].string = string;
571 debug_log[debug_log_pos].value = value;
574 /*printk(string, value);*/
578 #ifndef CONFIG_ETRAX_SERIAL_RX_TIMEOUT_TICKS
579 /* Default number of timer ticks before flushing rx fifo
580 * When using "little data, low latency applications: use 0
581 * When using "much data applications (PPP)" use ~5
583 #define CONFIG_ETRAX_SERIAL_RX_TIMEOUT_TICKS 5
586 unsigned long timer_data_to_ns(unsigned long timer_data);
588 static void change_speed(struct e100_serial *info);
589 static void rs_throttle(struct tty_struct * tty);
590 static void rs_wait_until_sent(struct tty_struct *tty, int timeout);
591 static int rs_write(struct tty_struct * tty, int from_user,
592 const unsigned char *buf, int count);
593 extern _INLINE_ int rs_raw_write(struct tty_struct * tty, int from_user,
594 const unsigned char *buf, int count);
595 #ifdef CONFIG_ETRAX_RS485
596 static int e100_write_rs485(struct tty_struct * tty, int from_user,
597 const unsigned char *buf, int count);
599 static int get_lsr_info(struct e100_serial * info, unsigned int *value);
602 #define DEF_BAUD 115200 /* 115.2 kbit/s */
603 #define STD_FLAGS (ASYNC_BOOT_AUTOCONF | ASYNC_SKIP_TEST)
604 #define DEF_RX 0x20 /* or SERIAL_CTRL_W >> 8 */
605 /* Default value of tx_ctrl register: has txd(bit 7)=1 (idle) as default */
606 #define DEF_TX 0x80 /* or SERIAL_CTRL_B */
608 /* offsets from R_SERIALx_CTRL */
611 #define REG_DATA_STATUS32 0 /* this is the 32 bit register R_SERIALx_READ */
612 #define REG_TR_DATA 0
614 #define REG_TR_CTRL 1
615 #define REG_REC_CTRL 2
617 #define REG_XOFF 4 /* this is a 32 bit register */
619 /* The bitfields are the same for all serial ports */
620 #define SER_RXD_MASK IO_MASK(R_SERIAL0_STATUS, rxd)
621 #define SER_DATA_AVAIL_MASK IO_MASK(R_SERIAL0_STATUS, data_avail)
622 #define SER_FRAMING_ERR_MASK IO_MASK(R_SERIAL0_STATUS, framing_err)
623 #define SER_PAR_ERR_MASK IO_MASK(R_SERIAL0_STATUS, par_err)
624 #define SER_OVERRUN_MASK IO_MASK(R_SERIAL0_STATUS, overrun)
626 #define SER_ERROR_MASK (SER_OVERRUN_MASK | SER_PAR_ERR_MASK | SER_FRAMING_ERR_MASK)
628 /* Values for info->errorcode */
629 #define ERRCODE_SET_BREAK (TTY_BREAK)
630 #define ERRCODE_INSERT 0x100
631 #define ERRCODE_INSERT_BREAK (ERRCODE_INSERT | TTY_BREAK)
633 #define FORCE_EOP(info) *R_SET_EOP = 1U << info->iseteop;
636 * General note regarding the use of IO_* macros in this file:
638 * We will use the bits defined for DMA channel 6 when using various
639 * IO_* macros (e.g. IO_STATE, IO_MASK, IO_EXTRACT) and _assume_ they are
640 * the same for all channels (which of course they are).
642 * We will also use the bits defined for serial port 0 when writing commands
643 * to the different ports, as these bits too are the same for all ports.
647 /* Mask for the irqs possibly enabled in R_IRQ_MASK1_RD etc. */
648 static const unsigned long e100_ser_int_mask = 0
649 #ifdef CONFIG_ETRAX_SERIAL_PORT0
650 | IO_MASK(R_IRQ_MASK1_RD, ser0_data) | IO_MASK(R_IRQ_MASK1_RD, ser0_ready)
652 #ifdef CONFIG_ETRAX_SERIAL_PORT1
653 | IO_MASK(R_IRQ_MASK1_RD, ser1_data) | IO_MASK(R_IRQ_MASK1_RD, ser1_ready)
655 #ifdef CONFIG_ETRAX_SERIAL_PORT2
656 | IO_MASK(R_IRQ_MASK1_RD, ser2_data) | IO_MASK(R_IRQ_MASK1_RD, ser2_ready)
658 #ifdef CONFIG_ETRAX_SERIAL_PORT3
659 | IO_MASK(R_IRQ_MASK1_RD, ser3_data) | IO_MASK(R_IRQ_MASK1_RD, ser3_ready)
662 unsigned long r_alt_ser_baudrate_shadow = 0;
664 /* this is the data for the four serial ports in the etrax100 */
665 /* DMA2(ser2), DMA4(ser3), DMA6(ser0) or DMA8(ser1) */
666 /* R_DMA_CHx_CLR_INTR, R_DMA_CHx_FIRST, R_DMA_CHx_CMD */
668 static struct e100_serial rs_table[] = {
670 .port = (unsigned char *)R_SERIAL0_CTRL,
671 .irq = 1U << 12, /* uses DMA 6 and 7 */
672 .oclrintradr = R_DMA_CH6_CLR_INTR,
673 .ofirstadr = R_DMA_CH6_FIRST,
674 .ocmdadr = R_DMA_CH6_CMD,
675 .ostatusadr = R_DMA_CH6_STATUS,
676 .iclrintradr = R_DMA_CH7_CLR_INTR,
677 .ifirstadr = R_DMA_CH7_FIRST,
678 .icmdadr = R_DMA_CH7_CMD,
679 .idescradr = R_DMA_CH7_DESCR,
684 #ifdef CONFIG_ETRAX_SERIAL_PORT0
686 #ifdef CONFIG_ETRAX_SERIAL_PORT0_DMA6_OUT
687 .dma_out_enabled = 1,
689 .dma_out_enabled = 0,
691 #ifdef CONFIG_ETRAX_SERIAL_PORT0_DMA7_IN
698 .dma_out_enabled = 0,
703 #ifndef CONFIG_SVINTO_SIM
705 .port = (unsigned char *)R_SERIAL1_CTRL,
706 .irq = 1U << 16, /* uses DMA 8 and 9 */
707 .oclrintradr = R_DMA_CH8_CLR_INTR,
708 .ofirstadr = R_DMA_CH8_FIRST,
709 .ocmdadr = R_DMA_CH8_CMD,
710 .ostatusadr = R_DMA_CH8_STATUS,
711 .iclrintradr = R_DMA_CH9_CLR_INTR,
712 .ifirstadr = R_DMA_CH9_FIRST,
713 .icmdadr = R_DMA_CH9_CMD,
714 .idescradr = R_DMA_CH9_DESCR,
719 #ifdef CONFIG_ETRAX_SERIAL_PORT1
721 #ifdef CONFIG_ETRAX_SERIAL_PORT1_DMA8_OUT
722 .dma_out_enabled = 1,
724 .dma_out_enabled = 0,
726 #ifdef CONFIG_ETRAX_SERIAL_PORT1_DMA9_IN
733 .dma_out_enabled = 0,
739 .port = (unsigned char *)R_SERIAL2_CTRL,
740 .irq = 1U << 4, /* uses DMA 2 and 3 */
741 .oclrintradr = R_DMA_CH2_CLR_INTR,
742 .ofirstadr = R_DMA_CH2_FIRST,
743 .ocmdadr = R_DMA_CH2_CMD,
744 .ostatusadr = R_DMA_CH2_STATUS,
745 .iclrintradr = R_DMA_CH3_CLR_INTR,
746 .ifirstadr = R_DMA_CH3_FIRST,
747 .icmdadr = R_DMA_CH3_CMD,
748 .idescradr = R_DMA_CH3_DESCR,
753 #ifdef CONFIG_ETRAX_SERIAL_PORT2
755 #ifdef CONFIG_ETRAX_SERIAL_PORT2_DMA2_OUT
756 .dma_out_enabled = 1,
758 .dma_out_enabled = 0,
760 #ifdef CONFIG_ETRAX_SERIAL_PORT2_DMA3_IN
767 .dma_out_enabled = 0,
773 .port = (unsigned char *)R_SERIAL3_CTRL,
774 .irq = 1U << 8, /* uses DMA 4 and 5 */
775 .oclrintradr = R_DMA_CH4_CLR_INTR,
776 .ofirstadr = R_DMA_CH4_FIRST,
777 .ocmdadr = R_DMA_CH4_CMD,
778 .ostatusadr = R_DMA_CH4_STATUS,
779 .iclrintradr = R_DMA_CH5_CLR_INTR,
780 .ifirstadr = R_DMA_CH5_FIRST,
781 .icmdadr = R_DMA_CH5_CMD,
782 .idescradr = R_DMA_CH5_DESCR,
787 #ifdef CONFIG_ETRAX_SERIAL_PORT3
789 #ifdef CONFIG_ETRAX_SERIAL_PORT3_DMA4_OUT
790 .dma_out_enabled = 1,
792 .dma_out_enabled = 0,
794 #ifdef CONFIG_ETRAX_SERIAL_PORT3_DMA5_IN
801 .dma_out_enabled = 0,
809 #define NR_PORTS (sizeof(rs_table)/sizeof(struct e100_serial))
811 static struct termios *serial_termios[NR_PORTS];
812 static struct termios *serial_termios_locked[NR_PORTS];
813 #ifdef CONFIG_ETRAX_SERIAL_FAST_TIMER
814 static struct fast_timer fast_timers[NR_PORTS];
817 #ifdef CONFIG_ETRAX_SERIAL_PROC_ENTRY
818 #define PROCSTAT(x) x
819 struct ser_statistics_type {
821 int early_errors_cnt;
824 unsigned long int processing_flip;
825 unsigned long processing_flip_still_room;
826 unsigned long int timeout_flush_cnt;
833 static struct ser_statistics_type ser_stat[NR_PORTS];
839 #endif /* CONFIG_ETRAX_SERIAL_PROC_ENTRY */
842 #if defined(CONFIG_ETRAX_RS485)
843 #ifdef CONFIG_ETRAX_FAST_TIMER
844 static struct fast_timer fast_timers_rs485[NR_PORTS];
846 #if defined(CONFIG_ETRAX_RS485_ON_PA)
847 static int rs485_pa_bit = CONFIG_ETRAX_RS485_ON_PA_BIT;
849 #if defined(CONFIG_ETRAX_RS485_ON_PORT_G)
850 static int rs485_port_g_bit = CONFIG_ETRAX_RS485_ON_PORT_G_BIT;
854 /* Info and macros needed for each ports extra control/status signals. */
855 #define E100_STRUCT_PORT(line, pinname) \
856 ((CONFIG_ETRAX_SER##line##_##pinname##_ON_PA_BIT >= 0)? \
857 (R_PORT_PA_DATA): ( \
858 (CONFIG_ETRAX_SER##line##_##pinname##_ON_PB_BIT >= 0)? \
859 (R_PORT_PB_DATA):&dummy_ser[line]))
861 #define E100_STRUCT_SHADOW(line, pinname) \
862 ((CONFIG_ETRAX_SER##line##_##pinname##_ON_PA_BIT >= 0)? \
863 (&port_pa_data_shadow): ( \
864 (CONFIG_ETRAX_SER##line##_##pinname##_ON_PB_BIT >= 0)? \
865 (&port_pb_data_shadow):&dummy_ser[line]))
866 #define E100_STRUCT_MASK(line, pinname) \
867 ((CONFIG_ETRAX_SER##line##_##pinname##_ON_PA_BIT >= 0)? \
868 (1<<CONFIG_ETRAX_SER##line##_##pinname##_ON_PA_BIT): ( \
869 (CONFIG_ETRAX_SER##line##_##pinname##_ON_PB_BIT >= 0)? \
870 (1<<CONFIG_ETRAX_SER##line##_##pinname##_ON_PB_BIT):DUMMY_##pinname##_MASK))
872 #define DUMMY_DTR_MASK 1
873 #define DUMMY_RI_MASK 2
874 #define DUMMY_DSR_MASK 4
875 #define DUMMY_CD_MASK 8
876 static unsigned char dummy_ser[NR_PORTS] = {0xFF, 0xFF, 0xFF,0xFF};
878 /* If not all status pins are used or disabled, use mixed mode */
879 #ifdef CONFIG_ETRAX_SERIAL_PORT0
881 #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)
883 #if SER0_PA_BITSUM != -4
884 # if CONFIG_ETRAX_SER0_DTR_ON_PA_BIT == -1
885 # ifndef CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED
886 # define CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED 1
889 # if CONFIG_ETRAX_SER0_RI_ON_PA_BIT == -1
890 # ifndef CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED
891 # define CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED 1
894 # if CONFIG_ETRAX_SER0_DSR_ON_PA_BIT == -1
895 # ifndef CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED
896 # define CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED 1
899 # if CONFIG_ETRAX_SER0_CD_ON_PA_BIT == -1
900 # ifndef CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED
901 # define CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED 1
906 #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)
908 #if SER0_PB_BITSUM != -4
909 # if CONFIG_ETRAX_SER0_DTR_ON_PB_BIT == -1
910 # ifndef CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED
911 # define CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED 1
914 # if CONFIG_ETRAX_SER0_RI_ON_PB_BIT == -1
915 # ifndef CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED
916 # define CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED 1
919 # if CONFIG_ETRAX_SER0_DSR_ON_PB_BIT == -1
920 # ifndef CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED
921 # define CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED 1
924 # if CONFIG_ETRAX_SER0_CD_ON_PB_BIT == -1
925 # ifndef CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED
926 # define CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED 1
934 #ifdef CONFIG_ETRAX_SERIAL_PORT1
936 #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)
938 #if SER1_PA_BITSUM != -4
939 # if CONFIG_ETRAX_SER1_DTR_ON_PA_BIT == -1
940 # ifndef CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED
941 # define CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED 1
944 # if CONFIG_ETRAX_SER1_RI_ON_PA_BIT == -1
945 # ifndef CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED
946 # define CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED 1
949 # if CONFIG_ETRAX_SER1_DSR_ON_PA_BIT == -1
950 # ifndef CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED
951 # define CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED 1
954 # if CONFIG_ETRAX_SER1_CD_ON_PA_BIT == -1
955 # ifndef CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED
956 # define CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED 1
961 #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)
963 #if SER1_PB_BITSUM != -4
964 # if CONFIG_ETRAX_SER1_DTR_ON_PB_BIT == -1
965 # ifndef CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED
966 # define CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED 1
969 # if CONFIG_ETRAX_SER1_RI_ON_PB_BIT == -1
970 # ifndef CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED
971 # define CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED 1
974 # if CONFIG_ETRAX_SER1_DSR_ON_PB_BIT == -1
975 # ifndef CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED
976 # define CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED 1
979 # if CONFIG_ETRAX_SER1_CD_ON_PB_BIT == -1
980 # ifndef CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED
981 # define CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED 1
988 #ifdef CONFIG_ETRAX_SERIAL_PORT2
990 #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)
992 #if SER2_PA_BITSUM != -4
993 # if CONFIG_ETRAX_SER2_DTR_ON_PA_BIT == -1
994 # ifndef CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED
995 # define CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED 1
998 # if CONFIG_ETRAX_SER2_RI_ON_PA_BIT == -1
999 # ifndef CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED
1000 # define CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED 1
1003 # if CONFIG_ETRAX_SER2_DSR_ON_PA_BIT == -1
1004 # ifndef CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED
1005 # define CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED 1
1008 # if CONFIG_ETRAX_SER2_CD_ON_PA_BIT == -1
1009 # ifndef CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED
1010 # define CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED 1
1015 #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)
1017 #if SER2_PB_BITSUM != -4
1018 # if CONFIG_ETRAX_SER2_DTR_ON_PB_BIT == -1
1019 # ifndef CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED
1020 # define CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED 1
1023 # if CONFIG_ETRAX_SER2_RI_ON_PB_BIT == -1
1024 # ifndef CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED
1025 # define CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED 1
1028 # if CONFIG_ETRAX_SER2_DSR_ON_PB_BIT == -1
1029 # ifndef CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED
1030 # define CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED 1
1033 # if CONFIG_ETRAX_SER2_CD_ON_PB_BIT == -1
1034 # ifndef CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED
1035 # define CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED 1
1042 #ifdef CONFIG_ETRAX_SERIAL_PORT3
1044 #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)
1046 #if SER3_PA_BITSUM != -4
1047 # if CONFIG_ETRAX_SER3_DTR_ON_PA_BIT == -1
1048 # ifndef CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED
1049 # define CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED 1
1052 # if CONFIG_ETRAX_SER3_RI_ON_PA_BIT == -1
1053 # ifndef CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED
1054 # define CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED 1
1057 # if CONFIG_ETRAX_SER3_DSR_ON_PA_BIT == -1
1058 # ifndef CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED
1059 # define CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED 1
1062 # if CONFIG_ETRAX_SER3_CD_ON_PA_BIT == -1
1063 # ifndef CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED
1064 # define CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED 1
1069 #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)
1071 #if SER3_PB_BITSUM != -4
1072 # if CONFIG_ETRAX_SER3_DTR_ON_PB_BIT == -1
1073 # ifndef CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED
1074 # define CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED 1
1077 # if CONFIG_ETRAX_SER3_RI_ON_PB_BIT == -1
1078 # ifndef CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED
1079 # define CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED 1
1082 # if CONFIG_ETRAX_SER3_DSR_ON_PB_BIT == -1
1083 # ifndef CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED
1084 # define CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED 1
1087 # if CONFIG_ETRAX_SER3_CD_ON_PB_BIT == -1
1088 # ifndef CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED
1089 # define CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED 1
1097 #if defined(CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED) || \
1098 defined(CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED) || \
1099 defined(CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED) || \
1100 defined(CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED)
1101 #define CONFIG_ETRAX_SERX_DTR_RI_DSR_CD_MIXED
1104 #ifdef CONFIG_ETRAX_SERX_DTR_RI_DSR_CD_MIXED
1105 /* The pins can be mixed on PA and PB */
1106 #define CONTROL_PINS_PORT_NOT_USED(line) \
1107 &dummy_ser[line], &dummy_ser[line], \
1108 &dummy_ser[line], &dummy_ser[line], \
1109 &dummy_ser[line], &dummy_ser[line], \
1110 &dummy_ser[line], &dummy_ser[line], \
1111 DUMMY_DTR_MASK, DUMMY_RI_MASK, DUMMY_DSR_MASK, DUMMY_CD_MASK
1116 volatile unsigned char *dtr_port;
1117 unsigned char *dtr_shadow;
1118 volatile unsigned char *ri_port;
1119 unsigned char *ri_shadow;
1120 volatile unsigned char *dsr_port;
1121 unsigned char *dsr_shadow;
1122 volatile unsigned char *cd_port;
1123 unsigned char *cd_shadow;
1125 unsigned char dtr_mask;
1126 unsigned char ri_mask;
1127 unsigned char dsr_mask;
1128 unsigned char cd_mask;
1131 static const struct control_pins e100_modem_pins[NR_PORTS] =
1135 #ifdef CONFIG_ETRAX_SERIAL_PORT0
1136 E100_STRUCT_PORT(0,DTR), E100_STRUCT_SHADOW(0,DTR),
1137 E100_STRUCT_PORT(0,RI), E100_STRUCT_SHADOW(0,RI),
1138 E100_STRUCT_PORT(0,DSR), E100_STRUCT_SHADOW(0,DSR),
1139 E100_STRUCT_PORT(0,CD), E100_STRUCT_SHADOW(0,CD),
1140 E100_STRUCT_MASK(0,DTR),
1141 E100_STRUCT_MASK(0,RI),
1142 E100_STRUCT_MASK(0,DSR),
1143 E100_STRUCT_MASK(0,CD)
1145 CONTROL_PINS_PORT_NOT_USED(0)
1151 #ifdef CONFIG_ETRAX_SERIAL_PORT1
1152 E100_STRUCT_PORT(1,DTR), E100_STRUCT_SHADOW(1,DTR),
1153 E100_STRUCT_PORT(1,RI), E100_STRUCT_SHADOW(1,RI),
1154 E100_STRUCT_PORT(1,DSR), E100_STRUCT_SHADOW(1,DSR),
1155 E100_STRUCT_PORT(1,CD), E100_STRUCT_SHADOW(1,CD),
1156 E100_STRUCT_MASK(1,DTR),
1157 E100_STRUCT_MASK(1,RI),
1158 E100_STRUCT_MASK(1,DSR),
1159 E100_STRUCT_MASK(1,CD)
1161 CONTROL_PINS_PORT_NOT_USED(1)
1167 #ifdef CONFIG_ETRAX_SERIAL_PORT2
1168 E100_STRUCT_PORT(2,DTR), E100_STRUCT_SHADOW(2,DTR),
1169 E100_STRUCT_PORT(2,RI), E100_STRUCT_SHADOW(2,RI),
1170 E100_STRUCT_PORT(2,DSR), E100_STRUCT_SHADOW(2,DSR),
1171 E100_STRUCT_PORT(2,CD), E100_STRUCT_SHADOW(2,CD),
1172 E100_STRUCT_MASK(2,DTR),
1173 E100_STRUCT_MASK(2,RI),
1174 E100_STRUCT_MASK(2,DSR),
1175 E100_STRUCT_MASK(2,CD)
1177 CONTROL_PINS_PORT_NOT_USED(2)
1183 #ifdef CONFIG_ETRAX_SERIAL_PORT3
1184 E100_STRUCT_PORT(3,DTR), E100_STRUCT_SHADOW(3,DTR),
1185 E100_STRUCT_PORT(3,RI), E100_STRUCT_SHADOW(3,RI),
1186 E100_STRUCT_PORT(3,DSR), E100_STRUCT_SHADOW(3,DSR),
1187 E100_STRUCT_PORT(3,CD), E100_STRUCT_SHADOW(3,CD),
1188 E100_STRUCT_MASK(3,DTR),
1189 E100_STRUCT_MASK(3,RI),
1190 E100_STRUCT_MASK(3,DSR),
1191 E100_STRUCT_MASK(3,CD)
1193 CONTROL_PINS_PORT_NOT_USED(3)
1197 #else /* CONFIG_ETRAX_SERX_DTR_RI_DSR_CD_MIXED */
1199 /* All pins are on either PA or PB for each serial port */
1200 #define CONTROL_PINS_PORT_NOT_USED(line) \
1201 &dummy_ser[line], &dummy_ser[line], \
1202 DUMMY_DTR_MASK, DUMMY_RI_MASK, DUMMY_DSR_MASK, DUMMY_CD_MASK
1207 volatile unsigned char *port;
1208 unsigned char *shadow;
1210 unsigned char dtr_mask;
1211 unsigned char ri_mask;
1212 unsigned char dsr_mask;
1213 unsigned char cd_mask;
1216 #define dtr_port port
1217 #define dtr_shadow shadow
1218 #define ri_port port
1219 #define ri_shadow shadow
1220 #define dsr_port port
1221 #define dsr_shadow shadow
1222 #define cd_port port
1223 #define cd_shadow shadow
1225 static const struct control_pins e100_modem_pins[NR_PORTS] =
1229 #ifdef CONFIG_ETRAX_SERIAL_PORT0
1230 E100_STRUCT_PORT(0,DTR), E100_STRUCT_SHADOW(0,DTR),
1231 E100_STRUCT_MASK(0,DTR),
1232 E100_STRUCT_MASK(0,RI),
1233 E100_STRUCT_MASK(0,DSR),
1234 E100_STRUCT_MASK(0,CD)
1236 CONTROL_PINS_PORT_NOT_USED(0)
1242 #ifdef CONFIG_ETRAX_SERIAL_PORT1
1243 E100_STRUCT_PORT(1,DTR), E100_STRUCT_SHADOW(1,DTR),
1244 E100_STRUCT_MASK(1,DTR),
1245 E100_STRUCT_MASK(1,RI),
1246 E100_STRUCT_MASK(1,DSR),
1247 E100_STRUCT_MASK(1,CD)
1249 CONTROL_PINS_PORT_NOT_USED(1)
1255 #ifdef CONFIG_ETRAX_SERIAL_PORT2
1256 E100_STRUCT_PORT(2,DTR), E100_STRUCT_SHADOW(2,DTR),
1257 E100_STRUCT_MASK(2,DTR),
1258 E100_STRUCT_MASK(2,RI),
1259 E100_STRUCT_MASK(2,DSR),
1260 E100_STRUCT_MASK(2,CD)
1262 CONTROL_PINS_PORT_NOT_USED(2)
1268 #ifdef CONFIG_ETRAX_SERIAL_PORT3
1269 E100_STRUCT_PORT(3,DTR), E100_STRUCT_SHADOW(3,DTR),
1270 E100_STRUCT_MASK(3,DTR),
1271 E100_STRUCT_MASK(3,RI),
1272 E100_STRUCT_MASK(3,DSR),
1273 E100_STRUCT_MASK(3,CD)
1275 CONTROL_PINS_PORT_NOT_USED(3)
1279 #endif /* !CONFIG_ETRAX_SERX_DTR_RI_DSR_CD_MIXED */
1281 #define E100_RTS_MASK 0x20
1282 #define E100_CTS_MASK 0x40
1284 /* All serial port signals are active low:
1285 * active = 0 -> 3.3V to RS-232 driver -> -12V on RS-232 level
1286 * inactive = 1 -> 0V to RS-232 driver -> +12V on RS-232 level
1288 * These macros returns the pin value: 0=0V, >=1 = 3.3V on ETRAX chip
1292 #define E100_RTS_GET(info) ((info)->rx_ctrl & E100_RTS_MASK)
1294 #define E100_CTS_GET(info) ((info)->port[REG_STATUS] & E100_CTS_MASK)
1296 /* These are typically PA or PB and 0 means 0V, 1 means 3.3V */
1298 #define E100_DTR_GET(info) ((*e100_modem_pins[(info)->line].dtr_shadow) & e100_modem_pins[(info)->line].dtr_mask)
1300 /* Normally inputs */
1301 #define E100_RI_GET(info) ((*e100_modem_pins[(info)->line].ri_port) & e100_modem_pins[(info)->line].ri_mask)
1302 #define E100_CD_GET(info) ((*e100_modem_pins[(info)->line].cd_port) & e100_modem_pins[(info)->line].cd_mask)
1305 #define E100_DSR_GET(info) ((*e100_modem_pins[(info)->line].dsr_port) & e100_modem_pins[(info)->line].dsr_mask)
1309 * tmp_buf is used as a temporary buffer by serial_write. We need to
1310 * lock it in case the memcpy_fromfs blocks while swapping in a page,
1311 * and some other program tries to do a serial write at the same time.
1312 * Since the lock will only come under contention when the system is
1313 * swapping and available memory is low, it makes sense to share one
1314 * buffer across all the serial ports, since it significantly saves
1315 * memory if large numbers of serial ports are open.
1317 static unsigned char *tmp_buf;
1318 #ifdef DECLARE_MUTEX
1319 static DECLARE_MUTEX(tmp_buf_sem);
1321 static struct semaphore tmp_buf_sem = MUTEX;
1324 /* Calculate the chartime depending on baudrate, numbor of bits etc. */
1325 static void update_char_time(struct e100_serial * info)
1327 tcflag_t cflags = info->tty->termios->c_cflag;
1330 /* calc. number of bits / data byte */
1331 /* databits + startbit and 1 stopbit */
1332 if ((cflags & CSIZE) == CS7)
1337 if (cflags & CSTOPB) /* 2 stopbits ? */
1340 if (cflags & PARENB) /* parity bit ? */
1344 info->char_time_usec = ((bits * 1000000) / info->baud) + 1;
1345 info->flush_time_usec = 4*info->char_time_usec;
1346 if (info->flush_time_usec < MIN_FLUSH_TIME_USEC)
1347 info->flush_time_usec = MIN_FLUSH_TIME_USEC;
1352 * This function maps from the Bxxxx defines in asm/termbits.h into real
1357 cflag_to_baud(unsigned int cflag)
1359 static int baud_table[] = {
1360 0, 50, 75, 110, 134, 150, 200, 300, 600, 1200, 1800, 2400,
1361 4800, 9600, 19200, 38400 };
1363 static int ext_baud_table[] = {
1364 0, 57600, 115200, 230400, 460800, 921600, 1843200, 6250000,
1365 0, 0, 0, 0, 0, 0, 0, 0 };
1367 if (cflag & CBAUDEX)
1368 return ext_baud_table[(cflag & CBAUD) & ~CBAUDEX];
1370 return baud_table[cflag & CBAUD];
1373 /* and this maps to an etrax100 hardware baud constant */
1375 static unsigned char
1376 cflag_to_etrax_baud(unsigned int cflag)
1380 static char baud_table[] = {
1381 -1, -1, -1, -1, -1, -1, -1, 0, 1, 2, -1, 3, 4, 5, 6, 7 };
1383 static char ext_baud_table[] = {
1384 -1, 8, 9, 10, 11, 12, 13, 14, -1, -1, -1, -1, -1, -1, -1, -1 };
1386 if (cflag & CBAUDEX)
1387 retval = ext_baud_table[(cflag & CBAUD) & ~CBAUDEX];
1389 retval = baud_table[cflag & CBAUD];
1392 printk(KERN_WARNING "serdriver tried setting invalid baud rate, flags %x.\n", cflag);
1393 retval = 5; /* choose default 9600 instead */
1396 return retval | (retval << 4); /* choose same for both TX and RX */
1400 /* Various static support functions */
1402 /* Functions to set or clear DTR/RTS on the requested line */
1403 /* It is complicated by the fact that RTS is a serial port register, while
1404 * DTR might not be implemented in the HW at all, and if it is, it can be on
1410 e100_dtr(struct e100_serial *info, int set)
1412 #ifndef CONFIG_SVINTO_SIM
1413 unsigned char mask = e100_modem_pins[info->line].dtr_mask;
1415 #ifdef SERIAL_DEBUG_IO
1416 printk("ser%i dtr %i mask: 0x%02X\n", info->line, set, mask);
1417 printk("ser%i shadow before 0x%02X get: %i\n",
1418 info->line, *e100_modem_pins[info->line].dtr_shadow,
1419 E100_DTR_GET(info));
1421 /* DTR is active low */
1423 unsigned long flags;
1427 *e100_modem_pins[info->line].dtr_shadow &= ~mask;
1428 *e100_modem_pins[info->line].dtr_shadow |= (set ? 0 : mask);
1429 *e100_modem_pins[info->line].dtr_port = *e100_modem_pins[info->line].dtr_shadow;
1430 restore_flags(flags);
1433 #ifdef SERIAL_DEBUG_IO
1434 printk("ser%i shadow after 0x%02X get: %i\n",
1435 info->line, *e100_modem_pins[info->line].dtr_shadow,
1436 E100_DTR_GET(info));
1441 /* set = 0 means 3.3V on the pin, bitvalue: 0=active, 1=inactive
1445 e100_rts(struct e100_serial *info, int set)
1447 #ifndef CONFIG_SVINTO_SIM
1448 unsigned long flags;
1451 info->rx_ctrl &= ~E100_RTS_MASK;
1452 info->rx_ctrl |= (set ? 0 : E100_RTS_MASK); /* RTS is active low */
1453 info->port[REG_REC_CTRL] = info->rx_ctrl;
1454 restore_flags(flags);
1455 #ifdef SERIAL_DEBUG_IO
1456 printk("ser%i rts %i\n", info->line, set);
1462 /* If this behaves as a modem, RI and CD is an output */
1464 e100_ri_out(struct e100_serial *info, int set)
1466 #ifndef CONFIG_SVINTO_SIM
1467 /* RI is active low */
1469 unsigned char mask = e100_modem_pins[info->line].ri_mask;
1470 unsigned long flags;
1474 *e100_modem_pins[info->line].ri_shadow &= ~mask;
1475 *e100_modem_pins[info->line].ri_shadow |= (set ? 0 : mask);
1476 *e100_modem_pins[info->line].ri_port = *e100_modem_pins[info->line].ri_shadow;
1477 restore_flags(flags);
1482 e100_cd_out(struct e100_serial *info, int set)
1484 #ifndef CONFIG_SVINTO_SIM
1485 /* CD is active low */
1487 unsigned char mask = e100_modem_pins[info->line].cd_mask;
1488 unsigned long flags;
1492 *e100_modem_pins[info->line].cd_shadow &= ~mask;
1493 *e100_modem_pins[info->line].cd_shadow |= (set ? 0 : mask);
1494 *e100_modem_pins[info->line].cd_port = *e100_modem_pins[info->line].cd_shadow;
1495 restore_flags(flags);
1501 e100_disable_rx(struct e100_serial *info)
1503 #ifndef CONFIG_SVINTO_SIM
1504 /* disable the receiver */
1505 info->port[REG_REC_CTRL] =
1506 (info->rx_ctrl &= ~IO_MASK(R_SERIAL0_REC_CTRL, rec_enable));
1511 e100_enable_rx(struct e100_serial *info)
1513 #ifndef CONFIG_SVINTO_SIM
1514 /* enable the receiver */
1515 info->port[REG_REC_CTRL] =
1516 (info->rx_ctrl |= IO_MASK(R_SERIAL0_REC_CTRL, rec_enable));
1520 /* the rx DMA uses both the dma_descr and the dma_eop interrupts */
1523 e100_disable_rxdma_irq(struct e100_serial *info)
1525 #ifdef SERIAL_DEBUG_INTR
1526 printk("rxdma_irq(%d): 0\n",info->line);
1528 DINTR1(DEBUG_LOG(info->line,"IRQ disable_rxdma_irq %i\n", info->line));
1529 *R_IRQ_MASK2_CLR = (info->irq << 2) | (info->irq << 3);
1533 e100_enable_rxdma_irq(struct e100_serial *info)
1535 #ifdef SERIAL_DEBUG_INTR
1536 printk("rxdma_irq(%d): 1\n",info->line);
1538 DINTR1(DEBUG_LOG(info->line,"IRQ enable_rxdma_irq %i\n", info->line));
1539 *R_IRQ_MASK2_SET = (info->irq << 2) | (info->irq << 3);
1542 /* the tx DMA uses only dma_descr interrupt */
1544 static _INLINE_ void
1545 e100_disable_txdma_irq(struct e100_serial *info)
1547 #ifdef SERIAL_DEBUG_INTR
1548 printk("txdma_irq(%d): 0\n",info->line);
1550 DINTR1(DEBUG_LOG(info->line,"IRQ disable_txdma_irq %i\n", info->line));
1551 *R_IRQ_MASK2_CLR = info->irq;
1554 static _INLINE_ void
1555 e100_enable_txdma_irq(struct e100_serial *info)
1557 #ifdef SERIAL_DEBUG_INTR
1558 printk("txdma_irq(%d): 1\n",info->line);
1560 DINTR1(DEBUG_LOG(info->line,"IRQ enable_txdma_irq %i\n", info->line));
1561 *R_IRQ_MASK2_SET = info->irq;
1564 static _INLINE_ void
1565 e100_disable_txdma_channel(struct e100_serial *info)
1567 unsigned long flags;
1569 /* Disable output DMA channel for the serial port in question
1570 * ( set to something other then serialX)
1574 DFLOW(DEBUG_LOG(info->line, "disable_txdma_channel %i\n", info->line));
1575 if (info->line == 0) {
1576 if ((genconfig_shadow & IO_MASK(R_GEN_CONFIG, dma6)) ==
1577 IO_STATE(R_GEN_CONFIG, dma6, serial0)) {
1578 genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma6);
1579 genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma6, unused);
1581 } else if (info->line == 1) {
1582 if ((genconfig_shadow & IO_MASK(R_GEN_CONFIG, dma8)) ==
1583 IO_STATE(R_GEN_CONFIG, dma8, serial1)) {
1584 genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma8);
1585 genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma8, usb);
1587 } else if (info->line == 2) {
1588 if ((genconfig_shadow & IO_MASK(R_GEN_CONFIG, dma2)) ==
1589 IO_STATE(R_GEN_CONFIG, dma2, serial2)) {
1590 genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma2);
1591 genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma2, par0);
1593 } else if (info->line == 3) {
1594 if ((genconfig_shadow & IO_MASK(R_GEN_CONFIG, dma4)) ==
1595 IO_STATE(R_GEN_CONFIG, dma4, serial3)) {
1596 genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma4);
1597 genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma4, par1);
1600 *R_GEN_CONFIG = genconfig_shadow;
1601 restore_flags(flags);
1605 static _INLINE_ void
1606 e100_enable_txdma_channel(struct e100_serial *info)
1608 unsigned long flags;
1612 DFLOW(DEBUG_LOG(info->line, "enable_txdma_channel %i\n", info->line));
1613 /* Enable output DMA channel for the serial port in question */
1614 if (info->line == 0) {
1615 genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma6);
1616 genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma6, serial0);
1617 } else if (info->line == 1) {
1618 genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma8);
1619 genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma8, serial1);
1620 } else if (info->line == 2) {
1621 genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma2);
1622 genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma2, serial2);
1623 } else if (info->line == 3) {
1624 genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma4);
1625 genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma4, serial3);
1627 *R_GEN_CONFIG = genconfig_shadow;
1628 restore_flags(flags);
1631 static _INLINE_ void
1632 e100_disable_rxdma_channel(struct e100_serial *info)
1634 unsigned long flags;
1636 /* Disable input DMA channel for the serial port in question
1637 * ( set to something other then serialX)
1641 if (info->line == 0) {
1642 if ((genconfig_shadow & IO_MASK(R_GEN_CONFIG, dma7)) ==
1643 IO_STATE(R_GEN_CONFIG, dma7, serial0)) {
1644 genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma7);
1645 genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma7, unused);
1647 } else if (info->line == 1) {
1648 if ((genconfig_shadow & IO_MASK(R_GEN_CONFIG, dma9)) ==
1649 IO_STATE(R_GEN_CONFIG, dma9, serial1)) {
1650 genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma9);
1651 genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma9, usb);
1653 } else if (info->line == 2) {
1654 if ((genconfig_shadow & IO_MASK(R_GEN_CONFIG, dma3)) ==
1655 IO_STATE(R_GEN_CONFIG, dma3, serial2)) {
1656 genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma3);
1657 genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma3, par0);
1659 } else if (info->line == 3) {
1660 if ((genconfig_shadow & IO_MASK(R_GEN_CONFIG, dma5)) ==
1661 IO_STATE(R_GEN_CONFIG, dma5, serial3)) {
1662 genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma5);
1663 genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma5, par1);
1666 *R_GEN_CONFIG = genconfig_shadow;
1667 restore_flags(flags);
1671 static _INLINE_ void
1672 e100_enable_rxdma_channel(struct e100_serial *info)
1674 unsigned long flags;
1678 /* Enable input DMA channel for the serial port in question */
1679 if (info->line == 0) {
1680 genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma7);
1681 genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma7, serial0);
1682 } else if (info->line == 1) {
1683 genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma9);
1684 genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma9, serial1);
1685 } else if (info->line == 2) {
1686 genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma3);
1687 genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma3, serial2);
1688 } else if (info->line == 3) {
1689 genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma5);
1690 genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma5, serial3);
1692 *R_GEN_CONFIG = genconfig_shadow;
1693 restore_flags(flags);
1696 #ifdef SERIAL_HANDLE_EARLY_ERRORS
1697 /* in order to detect and fix errors on the first byte
1698 we have to use the serial interrupts as well. */
1701 e100_disable_serial_data_irq(struct e100_serial *info)
1703 #ifdef SERIAL_DEBUG_INTR
1704 printk("ser_irq(%d): 0\n",info->line);
1706 DINTR1(DEBUG_LOG(info->line,"IRQ disable data_irq %i\n", info->line));
1707 *R_IRQ_MASK1_CLR = (1U << (8+2*info->line));
1711 e100_enable_serial_data_irq(struct e100_serial *info)
1713 #ifdef SERIAL_DEBUG_INTR
1714 printk("ser_irq(%d): 1\n",info->line);
1715 printk("**** %d = %d\n",
1717 (1U << (8+2*info->line)));
1719 DINTR1(DEBUG_LOG(info->line,"IRQ enable data_irq %i\n", info->line));
1720 *R_IRQ_MASK1_SET = (1U << (8+2*info->line));
1725 e100_disable_serial_tx_ready_irq(struct e100_serial *info)
1727 #ifdef SERIAL_DEBUG_INTR
1728 printk("ser_tx_irq(%d): 0\n",info->line);
1730 DINTR1(DEBUG_LOG(info->line,"IRQ disable ready_irq %i\n", info->line));
1731 *R_IRQ_MASK1_CLR = (1U << (8+1+2*info->line));
1735 e100_enable_serial_tx_ready_irq(struct e100_serial *info)
1737 #ifdef SERIAL_DEBUG_INTR
1738 printk("ser_tx_irq(%d): 1\n",info->line);
1739 printk("**** %d = %d\n",
1741 (1U << (8+1+2*info->line)));
1743 DINTR2(DEBUG_LOG(info->line,"IRQ enable ready_irq %i\n", info->line));
1744 *R_IRQ_MASK1_SET = (1U << (8+1+2*info->line));
1747 static inline void e100_enable_rx_irq(struct e100_serial *info)
1749 if (info->uses_dma_in)
1750 e100_enable_rxdma_irq(info);
1752 e100_enable_serial_data_irq(info);
1754 static inline void e100_disable_rx_irq(struct e100_serial *info)
1756 if (info->uses_dma_in)
1757 e100_disable_rxdma_irq(info);
1759 e100_disable_serial_data_irq(info);
1762 #if defined(CONFIG_ETRAX_RS485)
1763 /* Enable RS-485 mode on selected port. This is UGLY. */
1765 e100_enable_rs485(struct tty_struct *tty,struct rs485_control *r)
1767 struct e100_serial * info = (struct e100_serial *)tty->driver_data;
1769 #if defined(CONFIG_ETRAX_RS485_ON_PA)
1770 *R_PORT_PA_DATA = port_pa_data_shadow |= (1 << rs485_pa_bit);
1772 #if defined(CONFIG_ETRAX_RS485_ON_PORT_G)
1773 REG_SHADOW_SET(R_PORT_G_DATA, port_g_data_shadow,
1774 rs485_port_g_bit, 1);
1776 #if defined(CONFIG_ETRAX_RS485_LTC1387)
1777 REG_SHADOW_SET(R_PORT_G_DATA, port_g_data_shadow,
1778 CONFIG_ETRAX_RS485_LTC1387_DXEN_PORT_G_BIT, 1);
1779 REG_SHADOW_SET(R_PORT_G_DATA, port_g_data_shadow,
1780 CONFIG_ETRAX_RS485_LTC1387_RXEN_PORT_G_BIT, 1);
1783 info->rs485.rts_on_send = 0x01 & r->rts_on_send;
1784 info->rs485.rts_after_sent = 0x01 & r->rts_after_sent;
1785 if (r->delay_rts_before_send >= 1000)
1786 info->rs485.delay_rts_before_send = 1000;
1788 info->rs485.delay_rts_before_send = r->delay_rts_before_send;
1789 info->rs485.enabled = r->enabled;
1790 /* printk("rts: on send = %i, after = %i, enabled = %i",
1791 info->rs485.rts_on_send,
1792 info->rs485.rts_after_sent,
1800 e100_write_rs485(struct tty_struct *tty, int from_user,
1801 const unsigned char *buf, int count)
1803 struct e100_serial * info = (struct e100_serial *)tty->driver_data;
1804 int old_enabled = info->rs485.enabled;
1806 /* rs485 is always implicitly enabled if we're using the ioctl()
1807 * but it doesn't have to be set in the rs485_control
1808 * (to be backward compatible with old apps)
1809 * So we store, set and restore it.
1811 info->rs485.enabled = 1;
1812 /* rs_write now deals with RS485 if enabled */
1813 count = rs_write(tty, from_user, buf, count);
1814 info->rs485.enabled = old_enabled;
1818 #ifdef CONFIG_ETRAX_FAST_TIMER
1819 /* Timer function to toggle RTS when using FAST_TIMER */
1820 static void rs485_toggle_rts_timer_function(unsigned long data)
1822 struct e100_serial *info = (struct e100_serial *)data;
1824 fast_timers_rs485[info->line].function = NULL;
1825 e100_rts(info, info->rs485.rts_after_sent);
1826 #if defined(CONFIG_ETRAX_RS485_DISABLE_RECEIVER)
1827 e100_enable_rx(info);
1828 e100_enable_rx_irq(info);
1832 #endif /* CONFIG_ETRAX_RS485 */
1835 * ------------------------------------------------------------
1836 * rs_stop() and rs_start()
1838 * This routines are called before setting or resetting tty->stopped.
1839 * They enable or disable transmitter using the XOFF registers, as necessary.
1840 * ------------------------------------------------------------
1844 rs_stop(struct tty_struct *tty)
1846 struct e100_serial *info = (struct e100_serial *)tty->driver_data;
1848 unsigned long flags;
1851 save_flags(flags); cli();
1852 DFLOW(DEBUG_LOG(info->line, "XOFF rs_stop xmit %i\n",
1853 CIRC_CNT(info->xmit.head,
1854 info->xmit.tail,SERIAL_XMIT_SIZE)));
1856 xoff = IO_FIELD(R_SERIAL0_XOFF, xoff_char, STOP_CHAR(info->tty));
1857 xoff |= IO_STATE(R_SERIAL0_XOFF, tx_stop, stop);
1858 if (tty->termios->c_iflag & IXON ) {
1859 xoff |= IO_STATE(R_SERIAL0_XOFF, auto_xoff, enable);
1862 *((unsigned long *)&info->port[REG_XOFF]) = xoff;
1863 restore_flags(flags);
1868 rs_start(struct tty_struct *tty)
1870 struct e100_serial *info = (struct e100_serial *)tty->driver_data;
1872 unsigned long flags;
1875 save_flags(flags); cli();
1876 DFLOW(DEBUG_LOG(info->line, "XOFF rs_start xmit %i\n",
1877 CIRC_CNT(info->xmit.head,
1878 info->xmit.tail,SERIAL_XMIT_SIZE)));
1879 xoff = IO_FIELD(R_SERIAL0_XOFF, xoff_char, STOP_CHAR(tty));
1880 xoff |= IO_STATE(R_SERIAL0_XOFF, tx_stop, enable);
1881 if (tty->termios->c_iflag & IXON ) {
1882 xoff |= IO_STATE(R_SERIAL0_XOFF, auto_xoff, enable);
1885 *((unsigned long *)&info->port[REG_XOFF]) = xoff;
1886 if (!info->uses_dma_out &&
1887 info->xmit.head != info->xmit.tail && info->xmit.buf)
1888 e100_enable_serial_tx_ready_irq(info);
1890 restore_flags(flags);
1895 * ----------------------------------------------------------------------
1897 * Here starts the interrupt handling routines. All of the following
1898 * subroutines are declared as inline and are folded into
1899 * rs_interrupt(). They were separated out for readability's sake.
1901 * Note: rs_interrupt() is a "fast" interrupt, which means that it
1902 * runs with interrupts turned off. People who may want to modify
1903 * rs_interrupt() should try to keep the interrupt handler as fast as
1904 * possible. After you are done making modifications, it is not a bad
1907 * gcc -S -DKERNEL -Wall -Wstrict-prototypes -O6 -fomit-frame-pointer serial.c
1909 * and look at the resulting assemble code in serial.s.
1911 * - Ted Ts'o (tytso@mit.edu), 7-Mar-93
1912 * -----------------------------------------------------------------------
1916 * This routine is used by the interrupt handler to schedule
1917 * processing in the software interrupt portion of the driver.
1919 static _INLINE_ void
1920 rs_sched_event(struct e100_serial *info,
1923 if (info->event & (1 << event))
1925 info->event |= 1 << event;
1926 schedule_work(&info->work);
1929 /* The output DMA channel is free - use it to send as many chars as possible
1931 * We don't pay attention to info->x_char, which means if the TTY wants to
1932 * use XON/XOFF it will set info->x_char but we won't send any X char!
1934 * To implement this, we'd just start a DMA send of 1 byte pointing at a
1935 * buffer containing the X char, and skip updating xmit. We'd also have to
1936 * check if the last sent char was the X char when we enter this function
1937 * the next time, to avoid updating xmit with the sent X value.
1941 transmit_chars_dma(struct e100_serial *info)
1943 unsigned int c, sentl;
1944 struct etrax_dma_descr *descr;
1946 #ifdef CONFIG_SVINTO_SIM
1947 /* This will output too little if tail is not 0 always since
1948 * we don't reloop to send the other part. Anyway this SHOULD be a
1949 * no-op - transmit_chars_dma would never really be called during sim
1950 * since rs_write does not write into the xmit buffer then.
1952 if (info->xmit.tail)
1953 printk("Error in serial.c:transmit_chars-dma(), tail!=0\n");
1954 if (info->xmit.head != info->xmit.tail) {
1955 SIMCOUT(info->xmit.buf + info->xmit.tail,
1956 CIRC_CNT(info->xmit.head,
1959 info->xmit.head = info->xmit.tail; /* move back head */
1960 info->tr_running = 0;
1964 /* acknowledge both dma_descr and dma_eop irq in R_DMA_CHx_CLR_INTR */
1965 *info->oclrintradr =
1966 IO_STATE(R_DMA_CH6_CLR_INTR, clr_descr, do) |
1967 IO_STATE(R_DMA_CH6_CLR_INTR, clr_eop, do);
1969 #ifdef SERIAL_DEBUG_INTR
1970 if (info->line == SERIAL_DEBUG_LINE)
1973 if (!info->tr_running) {
1974 /* weirdo... we shouldn't get here! */
1975 printk(KERN_WARNING "Achtung: transmit_chars_dma with !tr_running\n");
1979 descr = &info->tr_descr;
1981 /* first get the amount of bytes sent during the last DMA transfer,
1982 and update xmit accordingly */
1984 /* if the stop bit was not set, all data has been sent */
1985 if (!(descr->status & d_stop)) {
1986 sentl = descr->sw_len;
1988 /* otherwise we find the amount of data sent here */
1989 sentl = descr->hw_len;
1991 DFLOW(DEBUG_LOG(info->line, "TX %i done\n", sentl));
1994 info->icount.tx += sentl;
1996 /* update xmit buffer */
1997 info->xmit.tail = (info->xmit.tail + sentl) & (SERIAL_XMIT_SIZE - 1);
1999 /* if there is only a few chars left in the buf, wake up the blocked
2001 if (CIRC_CNT(info->xmit.head,
2003 SERIAL_XMIT_SIZE) < WAKEUP_CHARS)
2004 rs_sched_event(info, RS_EVENT_WRITE_WAKEUP);
2006 /* find out the largest amount of consecutive bytes we want to send now */
2008 c = CIRC_CNT_TO_END(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
2010 /* Don't send all in one DMA transfer - divide it so we wake up
2011 * application before all is sent
2014 if (c >= 4*WAKEUP_CHARS)
2018 /* our job here is done, don't schedule any new DMA transfer */
2019 info->tr_running = 0;
2021 #if defined(CONFIG_ETRAX_RS485) && defined(CONFIG_ETRAX_FAST_TIMER)
2022 if (info->rs485.enabled) {
2023 /* Set a short timer to toggle RTS */
2024 start_one_shot_timer(&fast_timers_rs485[info->line],
2025 rs485_toggle_rts_timer_function,
2026 (unsigned long)info,
2027 info->char_time_usec*2,
2034 /* ok we can schedule a dma send of c chars starting at info->xmit.tail */
2035 /* set up the descriptor correctly for output */
2036 DFLOW(DEBUG_LOG(info->line, "TX %i\n", c));
2037 descr->ctrl = d_int | d_eol | d_wait; /* Wait needed for tty_wait_until_sent() */
2039 descr->buf = virt_to_phys(info->xmit.buf + info->xmit.tail);
2042 *info->ofirstadr = virt_to_phys(descr); /* write to R_DMAx_FIRST */
2043 *info->ocmdadr = IO_STATE(R_DMA_CH6_CMD, cmd, start);
2045 /* DMA is now running (hopefully) */
2046 } /* transmit_chars_dma */
2049 start_transmit(struct e100_serial *info)
2052 if (info->line == SERIAL_DEBUG_LINE)
2056 info->tr_descr.sw_len = 0;
2057 info->tr_descr.hw_len = 0;
2058 info->tr_descr.status = 0;
2059 info->tr_running = 1;
2060 if (info->uses_dma_out)
2061 transmit_chars_dma(info);
2063 e100_enable_serial_tx_ready_irq(info);
2064 } /* start_transmit */
2066 #ifdef CONFIG_ETRAX_SERIAL_FAST_TIMER
2067 static int serial_fast_timer_started = 0;
2068 static int serial_fast_timer_expired = 0;
2069 static void flush_timeout_function(unsigned long data);
2070 #define START_FLUSH_FAST_TIMER_TIME(info, string, usec) {\
2071 unsigned long timer_flags; \
2072 save_flags(timer_flags); \
2074 if (fast_timers[info->line].function == NULL) { \
2075 serial_fast_timer_started++; \
2076 TIMERD(DEBUG_LOG(info->line, "start_timer %i ", info->line)); \
2077 TIMERD(DEBUG_LOG(info->line, "num started: %i\n", serial_fast_timer_started)); \
2078 start_one_shot_timer(&fast_timers[info->line], \
2079 flush_timeout_function, \
2080 (unsigned long)info, \
2085 TIMERD(DEBUG_LOG(info->line, "timer %i already running\n", info->line)); \
2087 restore_flags(timer_flags); \
2089 #define START_FLUSH_FAST_TIMER(info, string) START_FLUSH_FAST_TIMER_TIME(info, string, info->flush_time_usec)
2092 #define START_FLUSH_FAST_TIMER_TIME(info, string, usec)
2093 #define START_FLUSH_FAST_TIMER(info, string)
2096 static struct etrax_recv_buffer *
2097 alloc_recv_buffer(unsigned int size)
2099 struct etrax_recv_buffer *buffer;
2101 if (!(buffer = kmalloc(sizeof *buffer + size, GFP_ATOMIC)))
2104 buffer->next = NULL;
2106 buffer->error = TTY_NORMAL;
2112 append_recv_buffer(struct e100_serial *info, struct etrax_recv_buffer *buffer)
2114 unsigned long flags;
2119 if (!info->first_recv_buffer)
2120 info->first_recv_buffer = buffer;
2122 info->last_recv_buffer->next = buffer;
2124 info->last_recv_buffer = buffer;
2126 info->recv_cnt += buffer->length;
2127 if (info->recv_cnt > info->max_recv_cnt)
2128 info->max_recv_cnt = info->recv_cnt;
2130 restore_flags(flags);
2134 add_char_and_flag(struct e100_serial *info, unsigned char data, unsigned char flag)
2136 struct etrax_recv_buffer *buffer;
2137 if (info->uses_dma_in) {
2138 if (!(buffer = alloc_recv_buffer(4)))
2142 buffer->error = flag;
2143 buffer->buffer[0] = data;
2145 append_recv_buffer(info, buffer);
2149 struct tty_struct *tty = info->tty;
2150 *tty->flip.char_buf_ptr = data;
2151 *tty->flip.flag_buf_ptr = flag;
2152 tty->flip.flag_buf_ptr++;
2153 tty->flip.char_buf_ptr++;
2161 extern _INLINE_ unsigned int
2162 handle_descr_data(struct e100_serial *info, struct etrax_dma_descr *descr, unsigned int recvl)
2164 struct etrax_recv_buffer *buffer = phys_to_virt(descr->buf) - sizeof *buffer;
2166 if (info->recv_cnt + recvl > 65536) {
2168 "%s: Too much pending incoming serial data! Dropping %u bytes.\n", __FUNCTION__, recvl);
2172 buffer->length = recvl;
2174 if (info->errorcode == ERRCODE_SET_BREAK)
2175 buffer->error = TTY_BREAK;
2176 info->errorcode = 0;
2178 append_recv_buffer(info, buffer);
2180 if (!(buffer = alloc_recv_buffer(SERIAL_DESCR_BUF_SIZE)))
2181 panic("%s: Failed to allocate memory for receive buffer!\n", __FUNCTION__);
2183 descr->buf = virt_to_phys(buffer->buffer);
2188 static _INLINE_ unsigned int
2189 handle_all_descr_data(struct e100_serial *info)
2191 struct etrax_dma_descr *descr;
2193 unsigned int ret = 0;
2197 descr = &info->rec_descr[info->cur_rec_descr];
2199 if (descr == phys_to_virt(*info->idescradr))
2202 if (++info->cur_rec_descr == SERIAL_RECV_DESCRIPTORS)
2203 info->cur_rec_descr = 0;
2205 /* find out how many bytes were read */
2207 /* if the eop bit was not set, all data has been received */
2208 if (!(descr->status & d_eop)) {
2209 recvl = descr->sw_len;
2211 /* otherwise we find the amount of data received here */
2212 recvl = descr->hw_len;
2215 /* Reset the status information */
2218 DFLOW( DEBUG_LOG(info->line, "RX %lu\n", recvl);
2219 if (info->tty->stopped) {
2220 unsigned char *buf = phys_to_virt(descr->buf);
2221 DEBUG_LOG(info->line, "rx 0x%02X\n", buf[0]);
2222 DEBUG_LOG(info->line, "rx 0x%02X\n", buf[1]);
2223 DEBUG_LOG(info->line, "rx 0x%02X\n", buf[2]);
2228 info->icount.rx += recvl;
2230 ret += handle_descr_data(info, descr, recvl);
2236 static _INLINE_ void
2237 receive_chars_dma(struct e100_serial *info)
2239 struct tty_struct *tty;
2240 unsigned char rstat;
2242 #ifdef CONFIG_SVINTO_SIM
2243 /* No receive in the simulator. Will probably be when the rest of
2244 * the serial interface works, and this piece will just be removed.
2249 /* Acknowledge both dma_descr and dma_eop irq in R_DMA_CHx_CLR_INTR */
2250 *info->iclrintradr =
2251 IO_STATE(R_DMA_CH6_CLR_INTR, clr_descr, do) |
2252 IO_STATE(R_DMA_CH6_CLR_INTR, clr_eop, do);
2255 if (!tty) /* Something wrong... */
2258 #ifdef SERIAL_HANDLE_EARLY_ERRORS
2259 if (info->uses_dma_in)
2260 e100_enable_serial_data_irq(info);
2263 if (info->errorcode == ERRCODE_INSERT_BREAK)
2264 add_char_and_flag(info, '\0', TTY_BREAK);
2266 handle_all_descr_data(info);
2268 /* Read the status register to detect errors */
2269 rstat = info->port[REG_STATUS];
2270 if (rstat & IO_MASK(R_SERIAL0_STATUS, xoff_detect) ) {
2271 DFLOW(DEBUG_LOG(info->line, "XOFF detect stat %x\n", rstat));
2274 if (rstat & SER_ERROR_MASK) {
2275 /* If we got an error, we must reset it by reading the
2278 unsigned char data = info->port[REG_DATA];
2280 PROCSTAT(ser_stat[info->line].errors_cnt++);
2281 DEBUG_LOG(info->line, "#dERR: s d 0x%04X\n",
2282 ((rstat & SER_ERROR_MASK) << 8) | data);
2284 if (rstat & SER_PAR_ERR_MASK)
2285 add_char_and_flag(info, data, TTY_PARITY);
2286 else if (rstat & SER_OVERRUN_MASK)
2287 add_char_and_flag(info, data, TTY_OVERRUN);
2288 else if (rstat & SER_FRAMING_ERR_MASK)
2289 add_char_and_flag(info, data, TTY_FRAME);
2292 START_FLUSH_FAST_TIMER(info, "receive_chars");
2294 /* Restart the receiving DMA */
2295 *info->icmdadr = IO_STATE(R_DMA_CH6_CMD, cmd, restart);
2299 start_recv_dma(struct e100_serial *info)
2301 struct etrax_dma_descr *descr = info->rec_descr;
2302 struct etrax_recv_buffer *buffer;
2305 /* Set up the receiving descriptors */
2306 for (i = 0; i < SERIAL_RECV_DESCRIPTORS; i++) {
2307 if (!(buffer = alloc_recv_buffer(SERIAL_DESCR_BUF_SIZE)))
2308 panic("%s: Failed to allocate memory for receive buffer!\n", __FUNCTION__);
2310 descr[i].ctrl = d_int;
2311 descr[i].buf = virt_to_phys(buffer->buffer);
2312 descr[i].sw_len = SERIAL_DESCR_BUF_SIZE;
2313 descr[i].hw_len = 0;
2314 descr[i].status = 0;
2315 descr[i].next = virt_to_phys(&descr[i+1]);
2318 /* Link the last descriptor to the first */
2319 descr[i-1].next = virt_to_phys(&descr[0]);
2321 /* Start with the first descriptor in the list */
2322 info->cur_rec_descr = 0;
2325 *info->ifirstadr = virt_to_phys(&descr[info->cur_rec_descr]);
2326 *info->icmdadr = IO_STATE(R_DMA_CH6_CMD, cmd, start);
2328 /* Input DMA should be running now */
2333 start_receive(struct e100_serial *info)
2335 #ifdef CONFIG_SVINTO_SIM
2336 /* No receive in the simulator. Will probably be when the rest of
2337 * the serial interface works, and this piece will just be removed.
2341 info->tty->flip.count = 0;
2342 if (info->uses_dma_in) {
2343 /* reset the input dma channel to be sure it works */
2345 *info->icmdadr = IO_STATE(R_DMA_CH6_CMD, cmd, reset);
2346 while (IO_EXTRACT(R_DMA_CH6_CMD, cmd, *info->icmdadr) ==
2347 IO_STATE_VALUE(R_DMA_CH6_CMD, cmd, reset));
2349 start_recv_dma(info);
2354 static _INLINE_ void
2355 status_handle(struct e100_serial *info, unsigned short status)
2359 /* the bits in the MASK2 register are laid out like this:
2360 DMAI_EOP DMAI_DESCR DMAO_EOP DMAO_DESCR
2361 where I is the input channel and O is the output channel for the port.
2362 info->irq is the bit number for the DMAO_DESCR so to check the others we
2363 shift info->irq to the left.
2366 /* dma output channel interrupt handler
2367 this interrupt is called from DMA2(ser2), DMA4(ser3), DMA6(ser0) or
2368 DMA8(ser1) when they have finished a descriptor with the intr flag set.
2372 tr_interrupt(int irq, void *dev_id, struct pt_regs * regs)
2374 struct e100_serial *info;
2379 #ifdef CONFIG_SVINTO_SIM
2380 /* No receive in the simulator. Will probably be when the rest of
2381 * the serial interface works, and this piece will just be removed.
2384 const char *s = "What? tr_interrupt in simulator??\n";
2385 SIMCOUT(s,strlen(s));
2390 /* find out the line that caused this irq and get it from rs_table */
2392 ireg = *R_IRQ_MASK2_RD; /* get the active irq bits for the dma channels */
2394 for (i = 0; i < NR_PORTS; i++) {
2395 info = rs_table + i;
2396 if (!info->enabled || !info->uses_dma_out)
2398 /* check for dma_descr (don't need to check for dma_eop in output dma for serial */
2399 if (ireg & info->irq) {
2401 /* we can send a new dma bunch. make it so. */
2402 DINTR2(DEBUG_LOG(info->line, "tr_interrupt %i\n", i));
2403 /* Read jiffies_usec first,
2404 * we want this time to be as late as possible
2406 PROCSTAT(ser_stat[info->line].tx_dma_ints++);
2407 info->last_tx_active_usec = GET_JIFFIES_USEC();
2408 info->last_tx_active = jiffies;
2409 transmit_chars_dma(info);
2412 /* FIXME: here we should really check for a change in the
2413 status lines and if so call status_handle(info) */
2415 return IRQ_RETVAL(handled);
2416 } /* tr_interrupt */
2418 /* dma input channel interrupt handler */
2421 rec_interrupt(int irq, void *dev_id, struct pt_regs * regs)
2423 struct e100_serial *info;
2428 #ifdef CONFIG_SVINTO_SIM
2429 /* No receive in the simulator. Will probably be when the rest of
2430 * the serial interface works, and this piece will just be removed.
2433 const char *s = "What? rec_interrupt in simulator??\n";
2434 SIMCOUT(s,strlen(s));
2439 /* find out the line that caused this irq and get it from rs_table */
2441 ireg = *R_IRQ_MASK2_RD; /* get the active irq bits for the dma channels */
2443 for (i = 0; i < NR_PORTS; i++) {
2444 info = rs_table + i;
2445 if (!info->enabled || !info->uses_dma_in)
2447 /* check for both dma_eop and dma_descr for the input dma channel */
2448 if (ireg & ((info->irq << 2) | (info->irq << 3))) {
2450 /* we have received something */
2451 receive_chars_dma(info);
2454 /* FIXME: here we should really check for a change in the
2455 status lines and if so call status_handle(info) */
2457 return IRQ_RETVAL(handled);
2458 } /* rec_interrupt */
2461 force_eop_if_needed(struct e100_serial *info)
2463 /* We check data_avail bit to determine if data has
2464 * arrived since last time
2466 unsigned char rstat = info->port[REG_STATUS];
2468 /* error or datavail? */
2469 if (rstat & SER_ERROR_MASK) {
2470 /* Some error has occurred. If there has been valid data, an
2471 * EOP interrupt will be made automatically. If no data, the
2472 * normal ser_interrupt should be enabled and handle it.
2475 DEBUG_LOG(info->line, "timeout err: rstat 0x%03X\n",
2476 rstat | (info->line << 8));
2480 if (rstat & SER_DATA_AVAIL_MASK) {
2481 /* Ok data, no error, count it */
2482 TIMERD(DEBUG_LOG(info->line, "timeout: rstat 0x%03X\n",
2483 rstat | (info->line << 8)));
2484 /* Read data to clear status flags */
2485 (void)info->port[REG_DATA];
2487 info->forced_eop = 0;
2488 START_FLUSH_FAST_TIMER(info, "magic");
2492 /* hit the timeout, force an EOP for the input
2493 * dma channel if we haven't already
2495 if (!info->forced_eop) {
2496 info->forced_eop = 1;
2497 PROCSTAT(ser_stat[info->line].timeout_flush_cnt++);
2498 TIMERD(DEBUG_LOG(info->line, "timeout EOP %i\n", info->line));
2505 extern _INLINE_ void
2506 flush_to_flip_buffer(struct e100_serial *info)
2508 struct tty_struct *tty;
2509 struct etrax_recv_buffer *buffer;
2510 unsigned int length;
2511 unsigned long flags;
2514 if (!info->first_recv_buffer)
2520 if (!(tty = info->tty)) {
2521 restore_flags(flags);
2525 length = tty->flip.count;
2526 /* Don't flip more than the ldisc has room for.
2527 * The return value from ldisc.receive_room(tty) - might not be up to
2528 * date, the previous flip of up to TTY_FLIPBUF_SIZE might be on the
2529 * processed and not accounted for yet.
2530 * Since we use DMA, 1 SERIAL_DESCR_BUF_SIZE could be on the way.
2531 * Lets buffer data here and let flow control take care of it.
2532 * Since we normally flip large chunks, the ldisc don't react
2533 * with throttle until too late if we flip to much.
2535 max_flip_size = tty->ldisc.receive_room(tty);
2536 if (max_flip_size < 0)
2538 if (max_flip_size <= (TTY_FLIPBUF_SIZE + /* Maybe not accounted for */
2539 length + info->recv_cnt + /* We have this queued */
2540 2*SERIAL_DESCR_BUF_SIZE + /* This could be on the way */
2541 TTY_THRESHOLD_THROTTLE)) { /* Some slack */
2542 /* check TTY_THROTTLED first so it indicates our state */
2543 if (!test_and_set_bit(TTY_THROTTLED, &tty->flags)) {
2544 DFLOW(DEBUG_LOG(info->line,"flush_to_flip throttles room %lu\n", max_flip_size));
2548 else if (max_flip_size <= (TTY_FLIPBUF_SIZE + /* Maybe not accounted for */
2549 length + info->recv_cnt + /* We have this queued */
2550 SERIAL_DESCR_BUF_SIZE + /* This could be on the way */
2551 TTY_THRESHOLD_THROTTLE)) { /* Some slack */
2552 DFLOW(DEBUG_LOG(info->line,"flush_to_flip throttles again! %lu\n", max_flip_size));
2558 if (max_flip_size > TTY_FLIPBUF_SIZE)
2559 max_flip_size = TTY_FLIPBUF_SIZE;
2561 while ((buffer = info->first_recv_buffer) && length < max_flip_size) {
2562 unsigned int count = buffer->length;
2564 if (length + count > max_flip_size)
2565 count = max_flip_size - length;
2567 memcpy(tty->flip.char_buf_ptr + length, buffer->buffer, count);
2568 memset(tty->flip.flag_buf_ptr + length, TTY_NORMAL, count);
2569 tty->flip.flag_buf_ptr[length] = buffer->error;
2572 info->recv_cnt -= count;
2573 DFLIP(DEBUG_LOG(info->line,"flip: %i\n", length));
2575 if (count == buffer->length) {
2576 info->first_recv_buffer = buffer->next;
2579 buffer->length -= count;
2580 memmove(buffer->buffer, buffer->buffer + count, buffer->length);
2581 buffer->error = TTY_NORMAL;
2585 if (!info->first_recv_buffer)
2586 info->last_recv_buffer = NULL;
2588 tty->flip.count = length;
2589 DFLIP(if (tty->ldisc.chars_in_buffer(tty) > 3500) {
2590 DEBUG_LOG(info->line, "ldisc %lu\n",
2591 tty->ldisc.chars_in_buffer(tty));
2592 DEBUG_LOG(info->line, "flip.count %lu\n",
2596 restore_flags(flags);
2601 if (test_bit(TTY_DONT_FLIP, &tty->flags)) {
2602 DEBUG_LOG(info->line, "*** TTY_DONT_FLIP set flip.count %i ***\n", tty->flip.count);
2603 DEBUG_LOG(info->line, "*** recv_cnt %i\n", info->recv_cnt);
2606 DEBUG_LOG(info->line, "*** rxtot %i\n", info->icount.rx);
2607 DEBUG_LOG(info->line, "ldisc %lu\n", tty->ldisc.chars_in_buffer(tty));
2608 DEBUG_LOG(info->line, "room %lu\n", tty->ldisc.receive_room(tty));
2613 /* this includes a check for low-latency */
2614 tty_flip_buffer_push(tty);
2617 static _INLINE_ void
2618 check_flush_timeout(struct e100_serial *info)
2620 /* Flip what we've got (if we can) */
2621 flush_to_flip_buffer(info);
2623 /* We might need to flip later, but not to fast
2624 * since the system is busy processing input... */
2625 if (info->first_recv_buffer)
2626 START_FLUSH_FAST_TIMER_TIME(info, "flip", 2000);
2628 /* Force eop last, since data might have come while we're processing
2629 * and if we started the slow timer above, we won't start a fast
2632 force_eop_if_needed(info);
2635 #ifdef CONFIG_ETRAX_SERIAL_FAST_TIMER
2636 static void flush_timeout_function(unsigned long data)
2638 struct e100_serial *info = (struct e100_serial *)data;
2640 fast_timers[info->line].function = NULL;
2641 serial_fast_timer_expired++;
2642 TIMERD(DEBUG_LOG(info->line, "flush_timout %i ", info->line));
2643 TIMERD(DEBUG_LOG(info->line, "num expired: %i\n", serial_fast_timer_expired));
2644 check_flush_timeout(info);
2649 /* dma fifo/buffer timeout handler
2650 forces an end-of-packet for the dma input channel if no chars
2651 have been received for CONFIG_ETRAX_SERIAL_RX_TIMEOUT_TICKS/100 s.
2654 static struct timer_list flush_timer;
2657 timed_flush_handler(unsigned long ptr)
2659 struct e100_serial *info;
2662 #ifdef CONFIG_SVINTO_SIM
2666 for (i = 0; i < NR_PORTS; i++) {
2667 info = rs_table + i;
2668 if (info->uses_dma_in)
2669 check_flush_timeout(info);
2672 /* restart flush timer */
2673 mod_timer(&flush_timer, jiffies + CONFIG_ETRAX_SERIAL_RX_TIMEOUT_TICKS);
2677 #ifdef SERIAL_HANDLE_EARLY_ERRORS
2679 /* If there is an error (ie break) when the DMA is running and
2680 * there are no bytes in the fifo the DMA is stopped and we get no
2681 * eop interrupt. Thus we have to monitor the first bytes on a DMA
2682 * transfer, and if it is without error we can turn the serial
2687 BREAK handling on ETRAX 100:
2688 ETRAX will generate interrupt although there is no stop bit between the
2691 Depending on how long the break sequence is, the end of the breaksequence
2692 will look differently:
2693 | indicates start/end of a character.
2695 B= Break character (0x00) with framing error.
2696 E= Error byte with parity error received after B characters.
2697 F= "Faked" valid byte received immediately after B characters.
2701 B BL ___________________________ V
2702 .._|__________|__________| |valid data |
2704 Multiple frame errors with data == 0x00 (B),
2705 the timing matches up "perfectly" so no extra ending char is detected.
2706 The RXD pin is 1 in the last interrupt, in that case
2707 we set info->errorcode = ERRCODE_INSERT_BREAK, but we can't really
2708 know if another byte will come and this really is case 2. below
2709 (e.g F=0xFF or 0xFE)
2710 If RXD pin is 0 we can expect another character (see 2. below).
2715 B B E or F__________________..__ V
2716 .._|__________|__________|______ | |valid data
2720 Multiple frame errors with data == 0x00 (B),
2721 but the part of the break trigs is interpreted as a start bit (and possibly
2722 some 0 bits followed by a number of 1 bits and a stop bit).
2723 Depending on parity settings etc. this last character can be either
2724 a fake "valid" char (F) or have a parity error (E).
2726 If the character is valid it will be put in the buffer,
2727 we set info->errorcode = ERRCODE_SET_BREAK so the receive interrupt
2728 will set the flags so the tty will handle it,
2729 if it's an error byte it will not be put in the buffer
2730 and we set info->errorcode = ERRCODE_INSERT_BREAK.
2732 To distinguish a V byte in 1. from an F byte in 2. we keep a timestamp
2733 of the last faulty char (B) and compares it with the current time:
2734 If the time elapsed time is less then 2*char_time_usec we will assume
2735 it's a faked F char and not a Valid char and set
2736 info->errorcode = ERRCODE_SET_BREAK.
2738 Flaws in the above solution:
2739 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
2740 We use the timer to distinguish a F character from a V character,
2741 if a V character is to close after the break we might make the wrong decision.
2743 TODO: The break will be delayed until an F or V character is received.
2748 struct e100_serial * handle_ser_rx_interrupt_no_dma(struct e100_serial *info)
2750 unsigned long data_read;
2751 struct tty_struct *tty = info->tty;
2754 printk("!NO TTY!\n");
2757 if (tty->flip.count >= TTY_FLIPBUF_SIZE - TTY_THRESHOLD_THROTTLE) {
2758 /* check TTY_THROTTLED first so it indicates our state */
2759 if (!test_and_set_bit(TTY_THROTTLED, &tty->flags)) {
2760 DFLOW(DEBUG_LOG(info->line, "rs_throttle flip.count: %i\n", tty->flip.count));
2764 if (tty->flip.count >= TTY_FLIPBUF_SIZE) {
2765 DEBUG_LOG(info->line, "force FLIP! %i\n", tty->flip.count);
2766 tty->flip.work.func((void *) tty);
2767 if (tty->flip.count >= TTY_FLIPBUF_SIZE) {
2768 DEBUG_LOG(info->line, "FLIP FULL! %i\n", tty->flip.count);
2769 return info; /* if TTY_DONT_FLIP is set */
2772 /* Read data and status at the same time */
2773 data_read = *((unsigned long *)&info->port[REG_DATA_STATUS32]);
2775 if (data_read & IO_MASK(R_SERIAL0_READ, xoff_detect) ) {
2776 DFLOW(DEBUG_LOG(info->line, "XOFF detect\n", 0));
2778 DINTR2(DEBUG_LOG(info->line, "ser_rx %c\n", IO_EXTRACT(R_SERIAL0_READ, data_in, data_read)));
2780 if (data_read & ( IO_MASK(R_SERIAL0_READ, framing_err) |
2781 IO_MASK(R_SERIAL0_READ, par_err) |
2782 IO_MASK(R_SERIAL0_READ, overrun) )) {
2784 info->last_rx_active_usec = GET_JIFFIES_USEC();
2785 info->last_rx_active = jiffies;
2786 DINTR1(DEBUG_LOG(info->line, "ser_rx err stat_data %04X\n", data_read));
2788 if (!log_int_trig1_pos) {
2789 log_int_trig1_pos = log_int_pos;
2790 log_int(rdpc(), 0, 0);
2795 if ( ((data_read & IO_MASK(R_SERIAL0_READ, data_in)) == 0) &&
2796 (data_read & IO_MASK(R_SERIAL0_READ, framing_err)) ) {
2797 /* Most likely a break, but we get interrupts over and
2801 if (!info->break_detected_cnt) {
2802 DEBUG_LOG(info->line, "#BRK start\n", 0);
2804 if (data_read & IO_MASK(R_SERIAL0_READ, rxd)) {
2805 /* The RX pin is high now, so the break
2806 * must be over, but....
2807 * we can't really know if we will get another
2808 * last byte ending the break or not.
2809 * And we don't know if the byte (if any) will
2810 * have an error or look valid.
2812 DEBUG_LOG(info->line, "# BL BRK\n", 0);
2813 info->errorcode = ERRCODE_INSERT_BREAK;
2815 info->break_detected_cnt++;
2817 /* The error does not look like a break, but could be
2820 if (info->break_detected_cnt) {
2821 DEBUG_LOG(info->line, "EBRK %i\n", info->break_detected_cnt);
2822 info->errorcode = ERRCODE_INSERT_BREAK;
2824 if (info->errorcode == ERRCODE_INSERT_BREAK) {
2826 *tty->flip.char_buf_ptr = 0;
2827 *tty->flip.flag_buf_ptr = TTY_BREAK;
2828 tty->flip.flag_buf_ptr++;
2829 tty->flip.char_buf_ptr++;
2833 *tty->flip.char_buf_ptr = IO_EXTRACT(R_SERIAL0_READ, data_in, data_read);
2835 if (data_read & IO_MASK(R_SERIAL0_READ, par_err)) {
2836 info->icount.parity++;
2837 *tty->flip.flag_buf_ptr = TTY_PARITY;
2838 } else if (data_read & IO_MASK(R_SERIAL0_READ, overrun)) {
2839 info->icount.overrun++;
2840 *tty->flip.flag_buf_ptr = TTY_OVERRUN;
2841 } else if (data_read & IO_MASK(R_SERIAL0_READ, framing_err)) {
2842 info->icount.frame++;
2843 *tty->flip.flag_buf_ptr = TTY_FRAME;
2845 info->errorcode = 0;
2847 info->break_detected_cnt = 0;
2849 } else if (data_read & IO_MASK(R_SERIAL0_READ, data_avail)) {
2852 if (!log_int_trig1_pos) {
2853 if (log_int_pos >= log_int_size) {
2856 log_int_trig0_pos = log_int_pos;
2857 log_int(rdpc(), 0, 0);
2860 *tty->flip.char_buf_ptr = IO_EXTRACT(R_SERIAL0_READ, data_in, data_read);
2861 *tty->flip.flag_buf_ptr = 0;
2863 DEBUG_LOG(info->line, "ser_rx int but no data_avail %08lX\n", data_read);
2867 tty->flip.flag_buf_ptr++;
2868 tty->flip.char_buf_ptr++;
2871 data_read = *((unsigned long *)&info->port[REG_DATA_STATUS32]);
2872 if (data_read & IO_MASK(R_SERIAL0_READ, data_avail)) {
2873 DEBUG_LOG(info->line, "ser_rx %c in loop\n", IO_EXTRACT(R_SERIAL0_READ, data_in, data_read));
2877 tty_flip_buffer_push(info->tty);
2882 struct e100_serial* handle_ser_rx_interrupt(struct e100_serial *info)
2884 unsigned char rstat;
2886 #ifdef SERIAL_DEBUG_INTR
2887 printk("Interrupt from serport %d\n", i);
2889 /* DEBUG_LOG(info->line, "ser_interrupt stat %03X\n", rstat | (i << 8)); */
2890 if (!info->uses_dma_in) {
2891 return handle_ser_rx_interrupt_no_dma(info);
2894 rstat = info->port[REG_STATUS];
2895 if (rstat & IO_MASK(R_SERIAL0_STATUS, xoff_detect) ) {
2896 DFLOW(DEBUG_LOG(info->line, "XOFF detect\n", 0));
2899 if (rstat & SER_ERROR_MASK) {
2902 info->last_rx_active_usec = GET_JIFFIES_USEC();
2903 info->last_rx_active = jiffies;
2904 /* If we got an error, we must reset it by reading the
2907 data = info->port[REG_DATA];
2908 DINTR1(DEBUG_LOG(info->line, "ser_rx! %c\n", data));
2909 DINTR1(DEBUG_LOG(info->line, "ser_rx err stat %02X\n", rstat));
2910 if (!data && (rstat & SER_FRAMING_ERR_MASK)) {
2911 /* Most likely a break, but we get interrupts over and
2915 if (!info->break_detected_cnt) {
2916 DEBUG_LOG(info->line, "#BRK start\n", 0);
2918 if (rstat & SER_RXD_MASK) {
2919 /* The RX pin is high now, so the break
2920 * must be over, but....
2921 * we can't really know if we will get another
2922 * last byte ending the break or not.
2923 * And we don't know if the byte (if any) will
2924 * have an error or look valid.
2926 DEBUG_LOG(info->line, "# BL BRK\n", 0);
2927 info->errorcode = ERRCODE_INSERT_BREAK;
2929 info->break_detected_cnt++;
2931 /* The error does not look like a break, but could be
2934 if (info->break_detected_cnt) {
2935 DEBUG_LOG(info->line, "EBRK %i\n", info->break_detected_cnt);
2936 info->errorcode = ERRCODE_INSERT_BREAK;
2938 if (info->errorcode == ERRCODE_INSERT_BREAK) {
2940 add_char_and_flag(info, '\0', TTY_BREAK);
2943 if (rstat & SER_PAR_ERR_MASK) {
2944 info->icount.parity++;
2945 add_char_and_flag(info, data, TTY_PARITY);
2946 } else if (rstat & SER_OVERRUN_MASK) {
2947 info->icount.overrun++;
2948 add_char_and_flag(info, data, TTY_OVERRUN);
2949 } else if (rstat & SER_FRAMING_ERR_MASK) {
2950 info->icount.frame++;
2951 add_char_and_flag(info, data, TTY_FRAME);
2954 info->errorcode = 0;
2956 info->break_detected_cnt = 0;
2957 DEBUG_LOG(info->line, "#iERR s d %04X\n",
2958 ((rstat & SER_ERROR_MASK) << 8) | data);
2960 PROCSTAT(ser_stat[info->line].early_errors_cnt++);
2961 } else { /* It was a valid byte, now let the DMA do the rest */
2962 unsigned long curr_time_u = GET_JIFFIES_USEC();
2963 unsigned long curr_time = jiffies;
2965 if (info->break_detected_cnt) {
2966 /* Detect if this character is a new valid char or the
2967 * last char in a break sequence: If LSBits are 0 and
2968 * MSBits are high AND the time is close to the
2969 * previous interrupt we should discard it.
2972 (curr_time - info->last_rx_active) * (1000000/HZ) +
2973 curr_time_u - info->last_rx_active_usec;
2974 if (elapsed_usec < 2*info->char_time_usec) {
2975 DEBUG_LOG(info->line, "FBRK %i\n", info->line);
2976 /* Report as BREAK (error) and let
2977 * receive_chars_dma() handle it
2979 info->errorcode = ERRCODE_SET_BREAK;
2981 DEBUG_LOG(info->line, "Not end of BRK (V)%i\n", info->line);
2983 DEBUG_LOG(info->line, "num brk %i\n", info->break_detected_cnt);
2986 #ifdef SERIAL_DEBUG_INTR
2987 printk("** OK, disabling ser_interrupts\n");
2989 e100_disable_serial_data_irq(info);
2990 DINTR2(DEBUG_LOG(info->line, "ser_rx OK %d\n", info->line));
2991 info->break_detected_cnt = 0;
2993 PROCSTAT(ser_stat[info->line].ser_ints_ok_cnt++);
2995 /* Restarting the DMA never hurts */
2996 *info->icmdadr = IO_STATE(R_DMA_CH6_CMD, cmd, restart);
2997 START_FLUSH_FAST_TIMER(info, "ser_int");
2999 } /* handle_ser_rx_interrupt */
3001 extern _INLINE_ void handle_ser_tx_interrupt(struct e100_serial *info)
3003 unsigned long flags;
3006 unsigned char rstat;
3007 DFLOW(DEBUG_LOG(info->line, "tx_int: xchar 0x%02X\n", info->x_char));
3008 save_flags(flags); cli();
3009 rstat = info->port[REG_STATUS];
3010 DFLOW(DEBUG_LOG(info->line, "stat %x\n", rstat));
3012 info->port[REG_TR_DATA] = info->x_char;
3015 /* We must enable since it is disabled in ser_interrupt */
3016 e100_enable_serial_tx_ready_irq(info);
3017 restore_flags(flags);
3020 if (info->uses_dma_out) {
3021 unsigned char rstat;
3023 /* We only use normal tx interrupt when sending x_char */
3024 DFLOW(DEBUG_LOG(info->line, "tx_int: xchar sent\n", 0));
3025 save_flags(flags); cli();
3026 rstat = info->port[REG_STATUS];
3027 DFLOW(DEBUG_LOG(info->line, "stat %x\n", rstat));
3028 e100_disable_serial_tx_ready_irq(info);
3029 if (info->tty->stopped)
3031 /* Enable the DMA channel and tell it to continue */
3032 e100_enable_txdma_channel(info);
3033 /* Wait 12 cycles before doing the DMA command */
3034 for(i = 6; i > 0; i--)
3037 *info->ocmdadr = IO_STATE(R_DMA_CH6_CMD, cmd, continue);
3038 restore_flags(flags);
3041 /* Normal char-by-char interrupt */
3042 if (info->xmit.head == info->xmit.tail
3043 || info->tty->stopped
3044 || info->tty->hw_stopped) {
3045 DFLOW(DEBUG_LOG(info->line, "tx_int: stopped %i\n", info->tty->stopped));
3046 e100_disable_serial_tx_ready_irq(info);
3047 info->tr_running = 0;
3050 DINTR2(DEBUG_LOG(info->line, "tx_int %c\n", info->xmit.buf[info->xmit.tail]));
3051 /* Send a byte, rs485 timing is critical so turn of ints */
3052 save_flags(flags); cli();
3053 info->port[REG_TR_DATA] = info->xmit.buf[info->xmit.tail];
3054 info->xmit.tail = (info->xmit.tail + 1) & (SERIAL_XMIT_SIZE-1);
3056 if (info->xmit.head == info->xmit.tail) {
3057 #if defined(CONFIG_ETRAX_RS485) && defined(CONFIG_ETRAX_FAST_TIMER)
3058 if (info->rs485.enabled) {
3059 /* Set a short timer to toggle RTS */
3060 start_one_shot_timer(&fast_timers_rs485[info->line],
3061 rs485_toggle_rts_timer_function,
3062 (unsigned long)info,
3063 info->char_time_usec*2,
3067 info->last_tx_active_usec = GET_JIFFIES_USEC();
3068 info->last_tx_active = jiffies;
3069 e100_disable_serial_tx_ready_irq(info);
3070 info->tr_running = 0;
3071 DFLOW(DEBUG_LOG(info->line, "tx_int: stop2\n", 0));
3073 /* We must enable since it is disabled in ser_interrupt */
3074 e100_enable_serial_tx_ready_irq(info);
3076 restore_flags(flags);
3078 if (CIRC_CNT(info->xmit.head,
3080 SERIAL_XMIT_SIZE) < WAKEUP_CHARS)
3081 rs_sched_event(info, RS_EVENT_WRITE_WAKEUP);
3083 } /* handle_ser_tx_interrupt */
3085 /* result of time measurements:
3086 * RX duration 54-60 us when doing something, otherwise 6-9 us
3087 * ser_int duration: just sending: 8-15 us normally, up to 73 us
3090 ser_interrupt(int irq, void *dev_id, struct pt_regs *regs)
3092 static volatile int tx_started = 0;
3093 struct e100_serial *info;
3095 unsigned long flags;
3096 unsigned long irq_mask1_rd;
3097 unsigned long data_mask = (1 << (8+2*0)); /* ser0 data_avail */
3099 static volatile unsigned long reentered_ready_mask = 0;
3101 save_flags(flags); cli();
3102 irq_mask1_rd = *R_IRQ_MASK1_RD;
3103 /* First handle all rx interrupts with ints disabled */
3105 irq_mask1_rd &= e100_ser_int_mask;
3106 for (i = 0; i < NR_PORTS; i++) {
3107 /* Which line caused the data irq? */
3108 if (irq_mask1_rd & data_mask) {
3110 handle_ser_rx_interrupt(info);
3115 /* Handle tx interrupts with interrupts enabled so we
3116 * can take care of new data interrupts while transmitting
3117 * We protect the tx part with the tx_started flag.
3118 * We disable the tr_ready interrupts we are about to handle and
3119 * unblock the serial interrupt so new serial interrupts may come.
3121 * If we get a new interrupt:
3122 * - it migth be due to synchronous serial ports.
3123 * - serial irq will be blocked by general irq handler.
3124 * - async data will be handled above (sync will be ignored).
3125 * - tx_started flag will prevent us from trying to send again and
3126 * we will exit fast - no need to unblock serial irq.
3127 * - Next (sync) serial interrupt handler will be runned with
3128 * disabled interrupt due to restore_flags() at end of function,
3129 * so sync handler will not be preempted or reentered.
3132 unsigned long ready_mask;
3135 /* Only the tr_ready interrupts left */
3136 irq_mask1_rd &= (IO_MASK(R_IRQ_MASK1_RD, ser0_ready) |
3137 IO_MASK(R_IRQ_MASK1_RD, ser1_ready) |
3138 IO_MASK(R_IRQ_MASK1_RD, ser2_ready) |
3139 IO_MASK(R_IRQ_MASK1_RD, ser3_ready));
3140 while (irq_mask1_rd) {
3141 /* Disable those we are about to handle */
3142 *R_IRQ_MASK1_CLR = irq_mask1_rd;
3143 /* Unblock the serial interrupt */
3144 *R_VECT_MASK_SET = IO_STATE(R_VECT_MASK_SET, serial, set);
3147 ready_mask = (1 << (8+1+2*0)); /* ser0 tr_ready */
3149 for (i = 0; i < NR_PORTS; i++) {
3150 /* Which line caused the ready irq? */
3151 if (irq_mask1_rd & ready_mask) {
3153 handle_ser_tx_interrupt(info);
3158 /* handle_ser_tx_interrupt enables tr_ready interrupts */
3160 /* Handle reentered TX interrupt */
3161 irq_mask1_rd = reentered_ready_mask;
3166 unsigned long ready_mask;
3167 ready_mask = irq_mask1_rd & (IO_MASK(R_IRQ_MASK1_RD, ser0_ready) |
3168 IO_MASK(R_IRQ_MASK1_RD, ser1_ready) |
3169 IO_MASK(R_IRQ_MASK1_RD, ser2_ready) |
3170 IO_MASK(R_IRQ_MASK1_RD, ser3_ready));
3172 reentered_ready_mask |= ready_mask;
3173 /* Disable those we are about to handle */
3174 *R_IRQ_MASK1_CLR = ready_mask;
3175 DFLOW(DEBUG_LOG(SERIAL_DEBUG_LINE, "ser_int reentered with TX %X\n", ready_mask));
3179 restore_flags(flags);
3180 return IRQ_RETVAL(handled);
3181 } /* ser_interrupt */
3185 * -------------------------------------------------------------------
3186 * Here ends the serial interrupt routines.
3187 * -------------------------------------------------------------------
3191 * This routine is used to handle the "bottom half" processing for the
3192 * serial driver, known also the "software interrupt" processing.
3193 * This processing is done at the kernel interrupt level, after the
3194 * rs_interrupt() has returned, BUT WITH INTERRUPTS TURNED ON. This
3195 * is where time-consuming activities which can not be done in the
3196 * interrupt driver proper are done; the interrupt driver schedules
3197 * them using rs_sched_event(), and they get done here.
3200 do_softint(void *private_)
3202 struct e100_serial *info = (struct e100_serial *) private_;
3203 struct tty_struct *tty;
3209 if (test_and_clear_bit(RS_EVENT_WRITE_WAKEUP, &info->event)) {
3210 if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) &&
3211 tty->ldisc.write_wakeup)
3212 (tty->ldisc.write_wakeup)(tty);
3213 wake_up_interruptible(&tty->write_wait);
3218 startup(struct e100_serial * info)
3220 unsigned long flags;
3221 unsigned long xmit_page;
3224 xmit_page = get_zeroed_page(GFP_KERNEL);
3231 /* if it was already initialized, skip this */
3233 if (info->flags & ASYNC_INITIALIZED) {
3234 restore_flags(flags);
3235 free_page(xmit_page);
3240 free_page(xmit_page);
3242 info->xmit.buf = (unsigned char *) xmit_page;
3244 #ifdef SERIAL_DEBUG_OPEN
3245 printk("starting up ttyS%d (xmit_buf 0x%p)...\n", info->line, info->xmit.buf);
3248 #ifdef CONFIG_SVINTO_SIM
3249 /* Bits and pieces collected from below. Better to have them
3250 in one ifdef:ed clause than to mix in a lot of ifdefs,
3253 clear_bit(TTY_IO_ERROR, &info->tty->flags);
3255 info->xmit.head = info->xmit.tail = 0;
3256 info->first_recv_buffer = info->last_recv_buffer = NULL;
3257 info->recv_cnt = info->max_recv_cnt = 0;
3259 for (i = 0; i < SERIAL_RECV_DESCRIPTORS; i++)
3260 info->rec_descr[i].buf = NULL;
3262 /* No real action in the simulator, but may set info important
3268 * Clear the FIFO buffers and disable them
3269 * (they will be reenabled in change_speed())
3273 * Reset the DMA channels and make sure their interrupts are cleared
3276 if (info->dma_in_enabled) {
3277 info->uses_dma_in = 1;
3278 e100_enable_rxdma_channel(info);
3280 *info->icmdadr = IO_STATE(R_DMA_CH6_CMD, cmd, reset);
3282 /* Wait until reset cycle is complete */
3283 while (IO_EXTRACT(R_DMA_CH6_CMD, cmd, *info->icmdadr) ==
3284 IO_STATE_VALUE(R_DMA_CH6_CMD, cmd, reset));
3286 /* Make sure the irqs are cleared */
3287 *info->iclrintradr =
3288 IO_STATE(R_DMA_CH6_CLR_INTR, clr_descr, do) |
3289 IO_STATE(R_DMA_CH6_CLR_INTR, clr_eop, do);
3291 e100_disable_rxdma_channel(info);
3294 if (info->dma_out_enabled) {
3295 info->uses_dma_out = 1;
3296 e100_enable_txdma_channel(info);
3297 *info->ocmdadr = IO_STATE(R_DMA_CH6_CMD, cmd, reset);
3299 while (IO_EXTRACT(R_DMA_CH6_CMD, cmd, *info->ocmdadr) ==
3300 IO_STATE_VALUE(R_DMA_CH6_CMD, cmd, reset));
3302 /* Make sure the irqs are cleared */
3303 *info->oclrintradr =
3304 IO_STATE(R_DMA_CH6_CLR_INTR, clr_descr, do) |
3305 IO_STATE(R_DMA_CH6_CLR_INTR, clr_eop, do);
3307 e100_disable_txdma_channel(info);
3311 clear_bit(TTY_IO_ERROR, &info->tty->flags);
3313 info->xmit.head = info->xmit.tail = 0;
3314 info->first_recv_buffer = info->last_recv_buffer = NULL;
3315 info->recv_cnt = info->max_recv_cnt = 0;
3317 for (i = 0; i < SERIAL_RECV_DESCRIPTORS; i++)
3318 info->rec_descr[i].buf = 0;
3321 * and set the speed and other flags of the serial port
3322 * this will start the rx/tx as well
3324 #ifdef SERIAL_HANDLE_EARLY_ERRORS
3325 e100_enable_serial_data_irq(info);
3329 /* dummy read to reset any serial errors */
3331 (void)info->port[REG_DATA];
3333 /* enable the interrupts */
3334 if (info->uses_dma_out)
3335 e100_enable_txdma_irq(info);
3337 e100_enable_rx_irq(info);
3339 info->tr_running = 0; /* to be sure we don't lock up the transmitter */
3341 /* setup the dma input descriptor and start dma */
3343 start_receive(info);
3345 /* for safety, make sure the descriptors last result is 0 bytes written */
3347 info->tr_descr.sw_len = 0;
3348 info->tr_descr.hw_len = 0;
3349 info->tr_descr.status = 0;
3351 /* enable RTS/DTR last */
3356 #endif /* CONFIG_SVINTO_SIM */
3358 info->flags |= ASYNC_INITIALIZED;
3360 restore_flags(flags);
3365 * This routine will shutdown a serial port; interrupts are disabled, and
3366 * DTR is dropped if the hangup on close termio flag is on.
3369 shutdown(struct e100_serial * info)
3371 unsigned long flags;
3372 struct etrax_dma_descr *descr = info->rec_descr;
3373 struct etrax_recv_buffer *buffer;
3376 #ifndef CONFIG_SVINTO_SIM
3377 /* shut down the transmitter and receiver */
3378 DFLOW(DEBUG_LOG(info->line, "shutdown %i\n", info->line));
3379 e100_disable_rx(info);
3380 info->port[REG_TR_CTRL] = (info->tx_ctrl &= ~0x40);
3382 /* disable interrupts, reset dma channels */
3383 if (info->uses_dma_in) {
3384 e100_disable_rxdma_irq(info);
3385 *info->icmdadr = IO_STATE(R_DMA_CH6_CMD, cmd, reset);
3386 info->uses_dma_in = 0;
3388 e100_disable_serial_data_irq(info);
3391 if (info->uses_dma_out) {
3392 e100_disable_txdma_irq(info);
3393 info->tr_running = 0;
3394 *info->ocmdadr = IO_STATE(R_DMA_CH6_CMD, cmd, reset);
3395 info->uses_dma_out = 0;
3397 e100_disable_serial_tx_ready_irq(info);
3398 info->tr_running = 0;
3401 #endif /* CONFIG_SVINTO_SIM */
3403 if (!(info->flags & ASYNC_INITIALIZED))
3406 #ifdef SERIAL_DEBUG_OPEN
3407 printk("Shutting down serial port %d (irq %d)....\n", info->line,
3412 cli(); /* Disable interrupts */
3414 if (info->xmit.buf) {
3415 free_page((unsigned long)info->xmit.buf);
3416 info->xmit.buf = NULL;
3419 for (i = 0; i < SERIAL_RECV_DESCRIPTORS; i++)
3421 buffer = phys_to_virt(descr[i].buf) - sizeof *buffer;
3426 if (!info->tty || (info->tty->termios->c_cflag & HUPCL)) {
3427 /* hang up DTR and RTS if HUPCL is enabled */
3429 e100_rts(info, 0); /* could check CRTSCTS before doing this */
3433 set_bit(TTY_IO_ERROR, &info->tty->flags);
3435 info->flags &= ~ASYNC_INITIALIZED;
3436 restore_flags(flags);
3440 /* change baud rate and other assorted parameters */
3443 change_speed(struct e100_serial *info)
3447 unsigned long flags;
3448 /* first some safety checks */
3450 if (!info->tty || !info->tty->termios)
3455 cflag = info->tty->termios->c_cflag;
3457 /* possibly, the tx/rx should be disabled first to do this safely */
3459 /* change baud-rate and write it to the hardware */
3460 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST) {
3461 /* Special baudrate */
3462 u32 mask = 0xFF << (info->line*8); /* Each port has 8 bits */
3463 unsigned long alt_source =
3464 IO_STATE(R_ALT_SER_BAUDRATE, ser0_rec, normal) |
3465 IO_STATE(R_ALT_SER_BAUDRATE, ser0_tr, normal);
3466 /* R_ALT_SER_BAUDRATE selects the source */
3467 DBAUD(printk("Custom baudrate: baud_base/divisor %lu/%i\n",
3468 (unsigned long)info->baud_base, info->custom_divisor));
3469 if (info->baud_base == SERIAL_PRESCALE_BASE) {
3470 /* 0, 2-65535 (0=65536) */
3471 u16 divisor = info->custom_divisor;
3472 /* R_SERIAL_PRESCALE (upper 16 bits of R_CLOCK_PRESCALE) */
3473 /* baudrate is 3.125MHz/custom_divisor */
3475 IO_STATE(R_ALT_SER_BAUDRATE, ser0_rec, prescale) |
3476 IO_STATE(R_ALT_SER_BAUDRATE, ser0_tr, prescale);
3478 DBAUD(printk("Writing SERIAL_PRESCALE: divisor %i\n", divisor));
3479 *R_SERIAL_PRESCALE = divisor;
3480 info->baud = SERIAL_PRESCALE_BASE/divisor;
3482 #ifdef CONFIG_ETRAX_EXTERN_PB6CLK_ENABLED
3483 else if ((info->baud_base==CONFIG_ETRAX_EXTERN_PB6CLK_FREQ/8 &&
3484 info->custom_divisor == 1) ||
3485 (info->baud_base==CONFIG_ETRAX_EXTERN_PB6CLK_FREQ &&
3486 info->custom_divisor == 8)) {
3487 /* ext_clk selected */
3489 IO_STATE(R_ALT_SER_BAUDRATE, ser0_rec, extern) |
3490 IO_STATE(R_ALT_SER_BAUDRATE, ser0_tr, extern);
3491 DBAUD(printk("using external baudrate: %lu\n", CONFIG_ETRAX_EXTERN_PB6CLK_FREQ/8));
3492 info->baud = CONFIG_ETRAX_EXTERN_PB6CLK_FREQ/8;
3498 /* Bad baudbase, we don't support using timer0
3501 printk(KERN_WARNING "Bad baud_base/custom_divisor: %lu/%i\n",
3502 (unsigned long)info->baud_base, info->custom_divisor);
3504 r_alt_ser_baudrate_shadow &= ~mask;
3505 r_alt_ser_baudrate_shadow |= (alt_source << (info->line*8));
3506 *R_ALT_SER_BAUDRATE = r_alt_ser_baudrate_shadow;
3508 /* Normal baudrate */
3509 /* Make sure we use normal baudrate */
3510 u32 mask = 0xFF << (info->line*8); /* Each port has 8 bits */
3511 unsigned long alt_source =
3512 IO_STATE(R_ALT_SER_BAUDRATE, ser0_rec, normal) |
3513 IO_STATE(R_ALT_SER_BAUDRATE, ser0_tr, normal);
3514 r_alt_ser_baudrate_shadow &= ~mask;
3515 r_alt_ser_baudrate_shadow |= (alt_source << (info->line*8));
3516 #ifndef CONFIG_SVINTO_SIM
3517 *R_ALT_SER_BAUDRATE = r_alt_ser_baudrate_shadow;
3518 #endif /* CONFIG_SVINTO_SIM */
3520 info->baud = cflag_to_baud(cflag);
3521 #ifndef CONFIG_SVINTO_SIM
3522 info->port[REG_BAUD] = cflag_to_etrax_baud(cflag);
3523 #endif /* CONFIG_SVINTO_SIM */
3526 #ifndef CONFIG_SVINTO_SIM
3527 /* start with default settings and then fill in changes */
3530 /* 8 bit, no/even parity */
3531 info->rx_ctrl &= ~(IO_MASK(R_SERIAL0_REC_CTRL, rec_bitnr) |
3532 IO_MASK(R_SERIAL0_REC_CTRL, rec_par_en) |
3533 IO_MASK(R_SERIAL0_REC_CTRL, rec_par));
3535 /* 8 bit, no/even parity, 1 stop bit, no cts */
3536 info->tx_ctrl &= ~(IO_MASK(R_SERIAL0_TR_CTRL, tr_bitnr) |
3537 IO_MASK(R_SERIAL0_TR_CTRL, tr_par_en) |
3538 IO_MASK(R_SERIAL0_TR_CTRL, tr_par) |
3539 IO_MASK(R_SERIAL0_TR_CTRL, stop_bits) |
3540 IO_MASK(R_SERIAL0_TR_CTRL, auto_cts));
3542 if ((cflag & CSIZE) == CS7) {
3543 /* set 7 bit mode */
3544 info->tx_ctrl |= IO_STATE(R_SERIAL0_TR_CTRL, tr_bitnr, tr_7bit);
3545 info->rx_ctrl |= IO_STATE(R_SERIAL0_REC_CTRL, rec_bitnr, rec_7bit);
3548 if (cflag & CSTOPB) {
3549 /* set 2 stop bit mode */
3550 info->tx_ctrl |= IO_STATE(R_SERIAL0_TR_CTRL, stop_bits, two_bits);
3553 if (cflag & PARENB) {
3555 info->tx_ctrl |= IO_STATE(R_SERIAL0_TR_CTRL, tr_par_en, enable);
3556 info->rx_ctrl |= IO_STATE(R_SERIAL0_REC_CTRL, rec_par_en, enable);
3559 if (cflag & CMSPAR) {
3560 /* enable stick parity, PARODD mean Mark which matches ETRAX */
3561 info->tx_ctrl |= IO_STATE(R_SERIAL0_TR_CTRL, tr_stick_par, stick);
3562 info->rx_ctrl |= IO_STATE(R_SERIAL0_REC_CTRL, rec_stick_par, stick);
3564 if (cflag & PARODD) {
3565 /* set odd parity (or Mark if CMSPAR) */
3566 info->tx_ctrl |= IO_STATE(R_SERIAL0_TR_CTRL, tr_par, odd);
3567 info->rx_ctrl |= IO_STATE(R_SERIAL0_REC_CTRL, rec_par, odd);
3570 if (cflag & CRTSCTS) {
3571 /* enable automatic CTS handling */
3572 DFLOW(DEBUG_LOG(info->line, "FLOW auto_cts enabled\n", 0));
3573 info->tx_ctrl |= IO_STATE(R_SERIAL0_TR_CTRL, auto_cts, active);
3576 /* make sure the tx and rx are enabled */
3578 info->tx_ctrl |= IO_STATE(R_SERIAL0_TR_CTRL, tr_enable, enable);
3579 info->rx_ctrl |= IO_STATE(R_SERIAL0_REC_CTRL, rec_enable, enable);
3581 /* actually write the control regs to the hardware */
3583 info->port[REG_TR_CTRL] = info->tx_ctrl;
3584 info->port[REG_REC_CTRL] = info->rx_ctrl;
3585 xoff = IO_FIELD(R_SERIAL0_XOFF, xoff_char, STOP_CHAR(info->tty));
3586 xoff |= IO_STATE(R_SERIAL0_XOFF, tx_stop, enable);
3587 if (info->tty->termios->c_iflag & IXON ) {
3588 DFLOW(DEBUG_LOG(info->line, "FLOW XOFF enabled 0x%02X\n", STOP_CHAR(info->tty)));
3589 xoff |= IO_STATE(R_SERIAL0_XOFF, auto_xoff, enable);
3592 *((unsigned long *)&info->port[REG_XOFF]) = xoff;
3593 restore_flags(flags);
3594 #endif /* !CONFIG_SVINTO_SIM */
3596 update_char_time(info);
3598 } /* change_speed */
3600 /* start transmitting chars NOW */
3603 rs_flush_chars(struct tty_struct *tty)
3605 struct e100_serial *info = (struct e100_serial *)tty->driver_data;
3606 unsigned long flags;
3608 if (info->tr_running ||
3609 info->xmit.head == info->xmit.tail ||
3615 #ifdef SERIAL_DEBUG_FLOW
3616 printk("rs_flush_chars\n");
3619 /* this protection might not exactly be necessary here */
3623 start_transmit(info);
3624 restore_flags(flags);
3628 rs_raw_write(struct tty_struct * tty, int from_user,
3629 const unsigned char *buf, int count)
3632 struct e100_serial *info = (struct e100_serial *)tty->driver_data;
3633 unsigned long flags;
3635 /* first some sanity checks */
3637 if (!tty || !info->xmit.buf || !tmp_buf)
3640 #ifdef SERIAL_DEBUG_DATA
3641 if (info->line == SERIAL_DEBUG_LINE)
3642 printk("rs_raw_write (%d), status %d\n",
3643 count, info->port[REG_STATUS]);
3646 #ifdef CONFIG_SVINTO_SIM
3647 /* Really simple. The output is here and now. */
3648 SIMCOUT(buf, count);
3652 DFLOW(DEBUG_LOG(info->line, "write count %i ", count));
3653 DFLOW(DEBUG_LOG(info->line, "ldisc %i\n", tty->ldisc.chars_in_buffer(tty)));
3656 /* the cli/restore_flags pairs below are needed because the
3657 * DMA interrupt handler moves the info->xmit values. the memcpy
3658 * needs to be in the critical region unfortunately, because we
3659 * need to read xmit values, memcpy, write xmit values in one
3660 * atomic operation... this could perhaps be avoided by more clever
3667 c = CIRC_SPACE_TO_END(info->xmit.head,
3675 c -= copy_from_user(tmp_buf, buf, c);
3682 c1 = CIRC_SPACE_TO_END(info->xmit.head,
3687 memcpy(info->xmit.buf + info->xmit.head, tmp_buf, c);
3688 info->xmit.head = ((info->xmit.head + c) &
3689 (SERIAL_XMIT_SIZE-1));
3690 restore_flags(flags);
3699 c = CIRC_SPACE_TO_END(info->xmit.head,
3708 memcpy(info->xmit.buf + info->xmit.head, buf, c);
3709 info->xmit.head = (info->xmit.head + c) &
3710 (SERIAL_XMIT_SIZE-1);
3715 restore_flags(flags);
3718 /* enable transmitter if not running, unless the tty is stopped
3719 * this does not need IRQ protection since if tr_running == 0
3720 * the IRQ's are not running anyway for this port.
3722 DFLOW(DEBUG_LOG(info->line, "write ret %i\n", ret));
3724 if (info->xmit.head != info->xmit.tail &&
3727 !info->tr_running) {
3728 start_transmit(info);
3732 } /* raw_raw_write() */
3735 rs_write(struct tty_struct * tty, int from_user,
3736 const unsigned char *buf, int count)
3738 #if defined(CONFIG_ETRAX_RS485)
3739 struct e100_serial *info = (struct e100_serial *)tty->driver_data;
3741 if (info->rs485.enabled)
3743 /* If we are in RS-485 mode, we need to toggle RTS and disable
3744 * the receiver before initiating a DMA transfer
3746 #ifdef CONFIG_ETRAX_FAST_TIMER
3747 /* Abort any started timer */
3748 fast_timers_rs485[info->line].function = NULL;
3749 del_fast_timer(&fast_timers_rs485[info->line]);
3751 e100_rts(info, info->rs485.rts_on_send);
3752 #if defined(CONFIG_ETRAX_RS485_DISABLE_RECEIVER)
3753 e100_disable_rx(info);
3754 e100_enable_rx_irq(info);
3757 if (info->rs485.delay_rts_before_send > 0)
3758 msleep(info->rs485.delay_rts_before_send);
3760 #endif /* CONFIG_ETRAX_RS485 */
3762 count = rs_raw_write(tty, from_user, buf, count);
3764 #if defined(CONFIG_ETRAX_RS485)
3765 if (info->rs485.enabled)
3768 /* If we are in RS-485 mode the following has to be done:
3769 * wait until DMA is ready
3770 * wait on transmit shift register
3772 * enable the receiver
3775 /* Sleep until all sent */
3776 tty_wait_until_sent(tty, 0);
3777 #ifdef CONFIG_ETRAX_FAST_TIMER
3778 /* Now sleep a little more so that shift register is empty */
3779 schedule_usleep(info->char_time_usec * 2);
3781 /* wait on transmit shift register */
3783 get_lsr_info(info, &val);
3784 }while (!(val & TIOCSER_TEMT));
3786 e100_rts(info, info->rs485.rts_after_sent);
3788 #if defined(CONFIG_ETRAX_RS485_DISABLE_RECEIVER)
3789 e100_enable_rx(info);
3790 e100_enable_rxdma_irq(info);
3793 #endif /* CONFIG_ETRAX_RS485 */
3799 /* how much space is available in the xmit buffer? */
3802 rs_write_room(struct tty_struct *tty)
3804 struct e100_serial *info = (struct e100_serial *)tty->driver_data;
3806 return CIRC_SPACE(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
3809 /* How many chars are in the xmit buffer?
3810 * This does not include any chars in the transmitter FIFO.
3811 * Use wait_until_sent for waiting for FIFO drain.
3815 rs_chars_in_buffer(struct tty_struct *tty)
3817 struct e100_serial *info = (struct e100_serial *)tty->driver_data;
3819 return CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
3822 /* discard everything in the xmit buffer */
3825 rs_flush_buffer(struct tty_struct *tty)
3827 struct e100_serial *info = (struct e100_serial *)tty->driver_data;
3828 unsigned long flags;
3832 info->xmit.head = info->xmit.tail = 0;
3833 restore_flags(flags);
3835 wake_up_interruptible(&tty->write_wait);
3837 if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) &&
3838 tty->ldisc.write_wakeup)
3839 (tty->ldisc.write_wakeup)(tty);
3843 * This function is used to send a high-priority XON/XOFF character to
3846 * Since we use DMA we don't check for info->x_char in transmit_chars_dma(),
3847 * but we do it in handle_ser_tx_interrupt().
3848 * We disable DMA channel and enable tx ready interrupt and write the
3849 * character when possible.
3851 static void rs_send_xchar(struct tty_struct *tty, char ch)
3853 struct e100_serial *info = (struct e100_serial *)tty->driver_data;
3854 unsigned long flags;
3855 save_flags(flags); cli();
3856 if (info->uses_dma_out) {
3857 /* Put the DMA on hold and disable the channel */
3858 *info->ocmdadr = IO_STATE(R_DMA_CH6_CMD, cmd, hold);
3859 while (IO_EXTRACT(R_DMA_CH6_CMD, cmd, *info->ocmdadr) !=
3860 IO_STATE_VALUE(R_DMA_CH6_CMD, cmd, hold));
3861 e100_disable_txdma_channel(info);
3864 /* Must make sure transmitter is not stopped before we can transmit */
3868 /* Enable manual transmit interrupt and send from there */
3869 DFLOW(DEBUG_LOG(info->line, "rs_send_xchar 0x%02X\n", ch));
3871 e100_enable_serial_tx_ready_irq(info);
3872 restore_flags(flags);
3876 * ------------------------------------------------------------
3879 * This routine is called by the upper-layer tty layer to signal that
3880 * incoming characters should be throttled.
3881 * ------------------------------------------------------------
3884 rs_throttle(struct tty_struct * tty)
3886 struct e100_serial *info = (struct e100_serial *)tty->driver_data;
3887 #ifdef SERIAL_DEBUG_THROTTLE
3890 printk("throttle %s: %lu....\n", tty_name(tty, buf),
3891 (unsigned long)tty->ldisc.chars_in_buffer(tty));
3893 DFLOW(DEBUG_LOG(info->line,"rs_throttle %lu\n", tty->ldisc.chars_in_buffer(tty)));
3895 /* Do RTS before XOFF since XOFF might take some time */
3896 if (tty->termios->c_cflag & CRTSCTS) {
3897 /* Turn off RTS line */
3901 rs_send_xchar(tty, STOP_CHAR(tty));
3906 rs_unthrottle(struct tty_struct * tty)
3908 struct e100_serial *info = (struct e100_serial *)tty->driver_data;
3909 #ifdef SERIAL_DEBUG_THROTTLE
3912 printk("unthrottle %s: %lu....\n", tty_name(tty, buf),
3913 (unsigned long)tty->ldisc.chars_in_buffer(tty));
3915 DFLOW(DEBUG_LOG(info->line,"rs_unthrottle ldisc %d\n", tty->ldisc.chars_in_buffer(tty)));
3916 DFLOW(DEBUG_LOG(info->line,"rs_unthrottle flip.count: %i\n", tty->flip.count));
3917 /* Do RTS before XOFF since XOFF might take some time */
3918 if (tty->termios->c_cflag & CRTSCTS) {
3919 /* Assert RTS line */
3927 rs_send_xchar(tty, START_CHAR(tty));
3933 * ------------------------------------------------------------
3934 * rs_ioctl() and friends
3935 * ------------------------------------------------------------
3939 get_serial_info(struct e100_serial * info,
3940 struct serial_struct * retinfo)
3942 struct serial_struct tmp;
3944 /* this is all probably wrong, there are a lot of fields
3945 * here that we don't have in e100_serial and maybe we
3946 * should set them to something else than 0.
3951 memset(&tmp, 0, sizeof(tmp));
3952 tmp.type = info->type;
3953 tmp.line = info->line;
3954 tmp.port = (int)info->port;
3955 tmp.irq = info->irq;
3956 tmp.flags = info->flags;
3957 tmp.baud_base = info->baud_base;
3958 tmp.close_delay = info->close_delay;
3959 tmp.closing_wait = info->closing_wait;
3960 tmp.custom_divisor = info->custom_divisor;
3961 if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
3967 set_serial_info(struct e100_serial *info,
3968 struct serial_struct *new_info)
3970 struct serial_struct new_serial;
3971 struct e100_serial old_info;
3974 if (copy_from_user(&new_serial, new_info, sizeof(new_serial)))
3979 if (!capable(CAP_SYS_ADMIN)) {
3980 if ((new_serial.type != info->type) ||
3981 (new_serial.close_delay != info->close_delay) ||
3982 ((new_serial.flags & ~ASYNC_USR_MASK) !=
3983 (info->flags & ~ASYNC_USR_MASK)))
3985 info->flags = ((info->flags & ~ASYNC_USR_MASK) |
3986 (new_serial.flags & ASYNC_USR_MASK));
3987 goto check_and_exit;
3990 if (info->count > 1)
3994 * OK, past this point, all the error checking has been done.
3995 * At this point, we start making changes.....
3998 info->baud_base = new_serial.baud_base;
3999 info->flags = ((info->flags & ~ASYNC_FLAGS) |
4000 (new_serial.flags & ASYNC_FLAGS));
4001 info->custom_divisor = new_serial.custom_divisor;
4002 info->type = new_serial.type;
4003 info->close_delay = new_serial.close_delay;
4004 info->closing_wait = new_serial.closing_wait;
4005 info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
4008 if (info->flags & ASYNC_INITIALIZED) {
4011 retval = startup(info);
4016 * get_lsr_info - get line status register info
4018 * Purpose: Let user call ioctl() to get info when the UART physically
4019 * is emptied. On bus types like RS485, the transmitter must
4020 * release the bus after transmitting. This must be done when
4021 * the transmit shift register is empty, not be done when the
4022 * transmit holding register is empty. This functionality
4023 * allows an RS485 driver to be written in user space.
4026 get_lsr_info(struct e100_serial * info, unsigned int *value)
4028 unsigned int result = TIOCSER_TEMT;
4029 #ifndef CONFIG_SVINTO_SIM
4030 unsigned long curr_time = jiffies;
4031 unsigned long curr_time_usec = GET_JIFFIES_USEC();
4032 unsigned long elapsed_usec =
4033 (curr_time - info->last_tx_active) * 1000000/HZ +
4034 curr_time_usec - info->last_tx_active_usec;
4036 if (info->xmit.head != info->xmit.tail ||
4037 elapsed_usec < 2*info->char_time_usec) {
4042 if (copy_to_user(value, &result, sizeof(int)))
4047 #ifdef SERIAL_DEBUG_IO
4054 const struct state_str control_state_str[] = {
4055 {TIOCM_DTR, "DTR" },
4059 {TIOCM_CTS, "CTS" },
4062 {TIOCM_DSR, "DSR" },
4066 char *get_control_state_str(int MLines, char *s)
4071 while (control_state_str[i].str != NULL) {
4072 if (MLines & control_state_str[i].state) {
4076 strcat(s, control_state_str[i].str);
4085 get_modem_info(struct e100_serial * info, unsigned int *value)
4087 unsigned int result;
4088 /* Polarity isn't verified */
4089 #if 0 /*def SERIAL_DEBUG_IO */
4091 printk("get_modem_info: RTS: %i DTR: %i CD: %i RI: %i DSR: %i CTS: %i\n",
4097 E100_CTS_GET(info));
4101 (!E100_RTS_GET(info) ? TIOCM_RTS : 0)
4102 | (!E100_DTR_GET(info) ? TIOCM_DTR : 0)
4103 | (!E100_RI_GET(info) ? TIOCM_RNG : 0)
4104 | (!E100_DSR_GET(info) ? TIOCM_DSR : 0)
4105 | (!E100_CD_GET(info) ? TIOCM_CAR : 0)
4106 | (!E100_CTS_GET(info) ? TIOCM_CTS : 0);
4108 #ifdef SERIAL_DEBUG_IO
4109 printk("e100ser: modem state: %i 0x%08X\n", result, result);
4113 get_control_state_str(result, s);
4114 printk("state: %s\n", s);
4117 if (copy_to_user(value, &result, sizeof(int)))
4124 set_modem_info(struct e100_serial * info, unsigned int cmd,
4125 unsigned int *value)
4129 if (copy_from_user(&arg, value, sizeof(int)))
4134 if (arg & TIOCM_RTS) {
4137 if (arg & TIOCM_DTR) {
4140 /* Handle FEMALE behaviour */
4141 if (arg & TIOCM_RI) {
4142 e100_ri_out(info, 1);
4144 if (arg & TIOCM_CD) {
4145 e100_cd_out(info, 1);
4149 if (arg & TIOCM_RTS) {
4152 if (arg & TIOCM_DTR) {
4155 /* Handle FEMALE behaviour */
4156 if (arg & TIOCM_RI) {
4157 e100_ri_out(info, 0);
4159 if (arg & TIOCM_CD) {
4160 e100_cd_out(info, 0);
4164 e100_rts(info, arg & TIOCM_RTS);
4165 e100_dtr(info, arg & TIOCM_DTR);
4166 /* Handle FEMALE behaviour */
4167 e100_ri_out(info, arg & TIOCM_RI);
4168 e100_cd_out(info, arg & TIOCM_CD);
4178 rs_break(struct tty_struct *tty, int break_state)
4180 struct e100_serial * info = (struct e100_serial *)tty->driver_data;
4181 unsigned long flags;
4188 if (break_state == -1) {
4189 /* Go to manual mode and set the txd pin to 0 */
4190 info->tx_ctrl &= 0x3F; /* Clear bit 7 (txd) and 6 (tr_enable) */
4192 info->tx_ctrl |= (0x80 | 0x40); /* Set bit 7 (txd) and 6 (tr_enable) */
4194 info->port[REG_TR_CTRL] = info->tx_ctrl;
4195 restore_flags(flags);
4199 rs_ioctl(struct tty_struct *tty, struct file * file,
4200 unsigned int cmd, unsigned long arg)
4202 struct e100_serial * info = (struct e100_serial *)tty->driver_data;
4204 if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
4205 (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGWILD) &&
4206 (cmd != TIOCSERSWILD) && (cmd != TIOCSERGSTRUCT)) {
4207 if (tty->flags & (1 << TTY_IO_ERROR))
4213 return get_modem_info(info, (unsigned int *) arg);
4217 return set_modem_info(info, cmd, (unsigned int *) arg);
4219 return get_serial_info(info,
4220 (struct serial_struct *) arg);
4222 return set_serial_info(info,
4223 (struct serial_struct *) arg);
4224 case TIOCSERGETLSR: /* Get line status register */
4225 return get_lsr_info(info, (unsigned int *) arg);
4227 case TIOCSERGSTRUCT:
4228 if (copy_to_user((struct e100_serial *) arg,
4229 info, sizeof(struct e100_serial)))
4233 #if defined(CONFIG_ETRAX_RS485)
4234 case TIOCSERSETRS485:
4236 struct rs485_control rs485ctrl;
4237 if (copy_from_user(&rs485ctrl, (struct rs485_control*)arg, sizeof(rs485ctrl)))
4240 return e100_enable_rs485(tty, &rs485ctrl);
4243 case TIOCSERWRRS485:
4245 struct rs485_write rs485wr;
4246 if (copy_from_user(&rs485wr, (struct rs485_write*)arg, sizeof(rs485wr)))
4249 return e100_write_rs485(tty, 1, rs485wr.outc, rs485wr.outc_size);
4254 return -ENOIOCTLCMD;
4260 rs_set_termios(struct tty_struct *tty, struct termios *old_termios)
4262 struct e100_serial *info = (struct e100_serial *)tty->driver_data;
4264 if (tty->termios->c_cflag == old_termios->c_cflag &&
4265 tty->termios->c_iflag == old_termios->c_iflag)
4270 /* Handle turning off CRTSCTS */
4271 if ((old_termios->c_cflag & CRTSCTS) &&
4272 !(tty->termios->c_cflag & CRTSCTS)) {
4273 tty->hw_stopped = 0;
4279 /* In debugport.c - register a console write function that uses the normal
4282 typedef int (*debugport_write_function)(int i, const char *buf, unsigned int len);
4284 extern debugport_write_function debug_write_function;
4286 static int rs_debug_write_function(int i, const char *buf, unsigned int len)
4290 struct tty_struct *tty;
4291 static int recurse_cnt = 0;
4293 tty = rs_table[i].tty;
4295 unsigned long flags;
4296 if (recurse_cnt > 5) /* We skip this debug output */
4299 local_irq_save(flags);
4301 local_irq_restore(flags);
4303 cnt = rs_write(tty, 0, buf + written, len);
4311 local_irq_save(flags);
4313 local_irq_restore(flags);
4320 * ------------------------------------------------------------
4323 * This routine is called when the serial port gets closed. First, we
4324 * wait for the last remaining data to be sent. Then, we unlink its
4325 * S structure from the interrupt chain if necessary, and we free
4326 * that IRQ if nothing is left in the chain.
4327 * ------------------------------------------------------------
4330 rs_close(struct tty_struct *tty, struct file * filp)
4332 struct e100_serial * info = (struct e100_serial *)tty->driver_data;
4333 unsigned long flags;
4338 /* interrupts are disabled for this entire function */
4343 if (tty_hung_up_p(filp)) {
4344 restore_flags(flags);
4348 #ifdef SERIAL_DEBUG_OPEN
4349 printk("[%d] rs_close ttyS%d, count = %d\n", current->pid,
4350 info->line, info->count);
4352 if ((tty->count == 1) && (info->count != 1)) {
4354 * Uh, oh. tty->count is 1, which means that the tty
4355 * structure will be freed. Info->count should always
4356 * be one in these conditions. If it's greater than
4357 * one, we've got real problems, since it means the
4358 * serial port won't be shutdown.
4361 "rs_close: bad serial port count; tty->count is 1, "
4362 "info->count is %d\n", info->count);
4365 if (--info->count < 0) {
4366 printk(KERN_CRIT "rs_close: bad serial port count for ttyS%d: %d\n",
4367 info->line, info->count);
4371 restore_flags(flags);
4374 info->flags |= ASYNC_CLOSING;
4376 * Save the termios structure, since this port may have
4377 * separate termios for callout and dialin.
4379 if (info->flags & ASYNC_NORMAL_ACTIVE)
4380 info->normal_termios = *tty->termios;
4382 * Now we wait for the transmit buffer to clear; and we notify
4383 * the line discipline to only process XON/XOFF characters.
4386 if (info->closing_wait != ASYNC_CLOSING_WAIT_NONE)
4387 tty_wait_until_sent(tty, info->closing_wait);
4389 * At this point we stop accepting input. To do this, we
4390 * disable the serial receiver and the DMA receive interrupt.
4392 #ifdef SERIAL_HANDLE_EARLY_ERRORS
4393 e100_disable_serial_data_irq(info);
4396 #ifndef CONFIG_SVINTO_SIM
4397 e100_disable_rx(info);
4398 e100_disable_rx_irq(info);
4400 if (info->flags & ASYNC_INITIALIZED) {
4402 * Before we drop DTR, make sure the UART transmitter
4403 * has completely drained; this is especially
4404 * important as we have a transmit FIFO!
4406 rs_wait_until_sent(tty, HZ);
4411 if (tty->driver->flush_buffer)
4412 tty->driver->flush_buffer(tty);
4413 if (tty->ldisc.flush_buffer)
4414 tty->ldisc.flush_buffer(tty);
4418 if (info->blocked_open) {
4419 if (info->close_delay) {
4420 set_current_state(TASK_INTERRUPTIBLE);
4421 schedule_timeout(info->close_delay);
4423 wake_up_interruptible(&info->open_wait);
4425 info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
4426 wake_up_interruptible(&info->close_wait);
4427 restore_flags(flags);
4431 #if defined(CONFIG_ETRAX_RS485)
4432 if (info->rs485.enabled) {
4433 info->rs485.enabled = 0;
4434 #if defined(CONFIG_ETRAX_RS485_ON_PA)
4435 *R_PORT_PA_DATA = port_pa_data_shadow &= ~(1 << rs485_pa_bit);
4437 #if defined(CONFIG_ETRAX_RS485_ON_PORT_G)
4438 REG_SHADOW_SET(R_PORT_G_DATA, port_g_data_shadow,
4439 rs485_port_g_bit, 0);
4441 #if defined(CONFIG_ETRAX_RS485_LTC1387)
4442 REG_SHADOW_SET(R_PORT_G_DATA, port_g_data_shadow,
4443 CONFIG_ETRAX_RS485_LTC1387_DXEN_PORT_G_BIT, 0);
4444 REG_SHADOW_SET(R_PORT_G_DATA, port_g_data_shadow,
4445 CONFIG_ETRAX_RS485_LTC1387_RXEN_PORT_G_BIT, 0);
4452 * rs_wait_until_sent() --- wait until the transmitter is empty
4454 static void rs_wait_until_sent(struct tty_struct *tty, int timeout)
4456 unsigned long orig_jiffies;
4457 struct e100_serial *info = (struct e100_serial *)tty->driver_data;
4458 unsigned long curr_time = jiffies;
4459 unsigned long curr_time_usec = GET_JIFFIES_USEC();
4461 (curr_time - info->last_tx_active) * (1000000/HZ) +
4462 curr_time_usec - info->last_tx_active_usec;
4465 * Check R_DMA_CHx_STATUS bit 0-6=number of available bytes in FIFO
4466 * R_DMA_CHx_HWSW bit 31-16=nbr of bytes left in DMA buffer (0=64k)
4468 orig_jiffies = jiffies;
4469 while (info->xmit.head != info->xmit.tail || /* More in send queue */
4470 (*info->ostatusadr & 0x007f) || /* more in FIFO */
4471 (elapsed_usec < 2*info->char_time_usec)) {
4472 set_current_state(TASK_INTERRUPTIBLE);
4473 schedule_timeout(1);
4474 if (signal_pending(current))
4476 if (timeout && time_after(jiffies, orig_jiffies + timeout))
4478 curr_time = jiffies;
4479 curr_time_usec = GET_JIFFIES_USEC();
4481 (curr_time - info->last_tx_active) * (1000000/HZ) +
4482 curr_time_usec - info->last_tx_active_usec;
4484 set_current_state(TASK_RUNNING);
4488 * rs_hangup() --- called by tty_hangup() when a hangup is signaled.
4491 rs_hangup(struct tty_struct *tty)
4493 struct e100_serial * info = (struct e100_serial *)tty->driver_data;
4495 rs_flush_buffer(tty);
4499 info->flags &= ~ASYNC_NORMAL_ACTIVE;
4501 wake_up_interruptible(&info->open_wait);
4505 * ------------------------------------------------------------
4506 * rs_open() and friends
4507 * ------------------------------------------------------------
4510 block_til_ready(struct tty_struct *tty, struct file * filp,
4511 struct e100_serial *info)
4513 DECLARE_WAITQUEUE(wait, current);
4514 unsigned long flags;
4516 int do_clocal = 0, extra_count = 0;
4519 * If the device is in the middle of being closed, then block
4520 * until it's done, and then try again.
4522 if (tty_hung_up_p(filp) ||
4523 (info->flags & ASYNC_CLOSING)) {
4524 if (info->flags & ASYNC_CLOSING)
4525 interruptible_sleep_on(&info->close_wait);
4526 #ifdef SERIAL_DO_RESTART
4527 if (info->flags & ASYNC_HUP_NOTIFY)
4530 return -ERESTARTSYS;
4537 * If non-blocking mode is set, or the port is not enabled,
4538 * then make the check up front and then exit.
4540 if ((filp->f_flags & O_NONBLOCK) ||
4541 (tty->flags & (1 << TTY_IO_ERROR))) {
4542 info->flags |= ASYNC_NORMAL_ACTIVE;
4546 if (tty->termios->c_cflag & CLOCAL) {
4551 * Block waiting for the carrier detect and the line to become
4552 * free (i.e., not in use by the callout). While we are in
4553 * this loop, info->count is dropped by one, so that
4554 * rs_close() knows when to free things. We restore it upon
4555 * exit, either normal or abnormal.
4558 add_wait_queue(&info->open_wait, &wait);
4559 #ifdef SERIAL_DEBUG_OPEN
4560 printk("block_til_ready before block: ttyS%d, count = %d\n",
4561 info->line, info->count);
4565 if (!tty_hung_up_p(filp)) {
4569 restore_flags(flags);
4570 info->blocked_open++;
4574 /* assert RTS and DTR */
4577 restore_flags(flags);
4578 set_current_state(TASK_INTERRUPTIBLE);
4579 if (tty_hung_up_p(filp) ||
4580 !(info->flags & ASYNC_INITIALIZED)) {
4581 #ifdef SERIAL_DO_RESTART
4582 if (info->flags & ASYNC_HUP_NOTIFY)
4585 retval = -ERESTARTSYS;
4591 if (!(info->flags & ASYNC_CLOSING) && do_clocal)
4592 /* && (do_clocal || DCD_IS_ASSERTED) */
4594 if (signal_pending(current)) {
4595 retval = -ERESTARTSYS;
4598 #ifdef SERIAL_DEBUG_OPEN
4599 printk("block_til_ready blocking: ttyS%d, count = %d\n",
4600 info->line, info->count);
4604 set_current_state(TASK_RUNNING);
4605 remove_wait_queue(&info->open_wait, &wait);
4608 info->blocked_open--;
4609 #ifdef SERIAL_DEBUG_OPEN
4610 printk("block_til_ready after blocking: ttyS%d, count = %d\n",
4611 info->line, info->count);
4615 info->flags |= ASYNC_NORMAL_ACTIVE;
4620 * This routine is called whenever a serial port is opened.
4621 * It performs the serial-specific initialization for the tty structure.
4624 rs_open(struct tty_struct *tty, struct file * filp)
4626 struct e100_serial *info;
4630 /* find which port we want to open */
4634 if (line < 0 || line >= NR_PORTS)
4637 /* find the corresponding e100_serial struct in the table */
4638 info = rs_table + line;
4640 /* don't allow the opening of ports that are not enabled in the HW config */
4644 #ifdef SERIAL_DEBUG_OPEN
4645 printk("[%d] rs_open %s, count = %d\n", current->pid, tty->name,
4650 tty->driver_data = info;
4653 info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
4656 page = get_zeroed_page(GFP_KERNEL);
4663 tmp_buf = (unsigned char *) page;
4667 * If the port is in the middle of closing, bail out now
4669 if (tty_hung_up_p(filp) ||
4670 (info->flags & ASYNC_CLOSING)) {
4671 if (info->flags & ASYNC_CLOSING)
4672 interruptible_sleep_on(&info->close_wait);
4673 #ifdef SERIAL_DO_RESTART
4674 return ((info->flags & ASYNC_HUP_NOTIFY) ?
4675 -EAGAIN : -ERESTARTSYS);
4682 * Start up the serial port
4685 retval = startup(info);
4689 retval = block_til_ready(tty, filp, info);
4691 #ifdef SERIAL_DEBUG_OPEN
4692 printk("rs_open returning after block_til_ready with %d\n",
4698 if ((info->count == 1) && (info->flags & ASYNC_SPLIT_TERMIOS)) {
4699 *tty->termios = info->normal_termios;
4703 #ifdef SERIAL_DEBUG_OPEN
4704 printk("rs_open ttyS%d successful...\n", info->line);
4706 DLOG_INT_TRIG( log_int_pos = 0);
4708 DFLIP( if (info->line == SERIAL_DEBUG_LINE) {
4709 info->icount.rx = 0;
4716 * /proc fs routines....
4719 extern _INLINE_ int line_info(char *buf, struct e100_serial *info)
4725 ret = sprintf(buf, "%d: uart:E100 port:%lX irq:%d",
4726 info->line, (unsigned long)info->port, info->irq);
4728 if (!info->port || (info->type == PORT_UNKNOWN)) {
4729 ret += sprintf(buf+ret, "\n");
4735 if (!E100_RTS_GET(info))
4736 strcat(stat_buf, "|RTS");
4737 if (!E100_CTS_GET(info))
4738 strcat(stat_buf, "|CTS");
4739 if (!E100_DTR_GET(info))
4740 strcat(stat_buf, "|DTR");
4741 if (!E100_DSR_GET(info))
4742 strcat(stat_buf, "|DSR");
4743 if (!E100_CD_GET(info))
4744 strcat(stat_buf, "|CD");
4745 if (!E100_RI_GET(info))
4746 strcat(stat_buf, "|RI");
4748 ret += sprintf(buf+ret, " baud:%d", info->baud);
4750 ret += sprintf(buf+ret, " tx:%lu rx:%lu",
4751 (unsigned long)info->icount.tx,
4752 (unsigned long)info->icount.rx);
4753 tmp = CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
4755 ret += sprintf(buf+ret, " tx_pend:%lu/%lu",
4757 (unsigned long)SERIAL_XMIT_SIZE);
4760 ret += sprintf(buf+ret, " rx_pend:%lu/%lu",
4761 (unsigned long)info->recv_cnt,
4762 (unsigned long)info->max_recv_cnt);
4767 if (info->tty->stopped)
4768 ret += sprintf(buf+ret, " stopped:%i",
4769 (int)info->tty->stopped);
4770 if (info->tty->hw_stopped)
4771 ret += sprintf(buf+ret, " hw_stopped:%i",
4772 (int)info->tty->hw_stopped);
4776 unsigned char rstat = info->port[REG_STATUS];
4777 if (rstat & IO_MASK(R_SERIAL0_STATUS, xoff_detect) )
4778 ret += sprintf(buf+ret, " xoff_detect:1");
4786 if (info->icount.frame)
4787 ret += sprintf(buf+ret, " fe:%lu",
4788 (unsigned long)info->icount.frame);
4790 if (info->icount.parity)
4791 ret += sprintf(buf+ret, " pe:%lu",
4792 (unsigned long)info->icount.parity);
4794 if (info->icount.brk)
4795 ret += sprintf(buf+ret, " brk:%lu",
4796 (unsigned long)info->icount.brk);
4798 if (info->icount.overrun)
4799 ret += sprintf(buf+ret, " oe:%lu",
4800 (unsigned long)info->icount.overrun);
4803 * Last thing is the RS-232 status lines
4805 ret += sprintf(buf+ret, " %s\n", stat_buf+1);
4809 int rs_read_proc(char *page, char **start, off_t off, int count,
4810 int *eof, void *data)
4815 len += sprintf(page, "serinfo:1.0 driver:%s\n",
4817 for (i = 0; i < NR_PORTS && len < 4000; i++) {
4818 if (!rs_table[i].enabled)
4820 l = line_info(page + len, &rs_table[i]);
4822 if (len+begin > off+count)
4824 if (len+begin < off) {
4829 #ifdef DEBUG_LOG_INCLUDED
4830 for (i = 0; i < debug_log_pos; i++) {
4831 len += sprintf(page + len, "%-4i %lu.%lu ", i, debug_log[i].time, timer_data_to_ns(debug_log[i].timer_data));
4832 len += sprintf(page + len, debug_log[i].string, debug_log[i].value);
4833 if (len+begin > off+count)
4835 if (len+begin < off) {
4840 len += sprintf(page + len, "debug_log %i/%i %li bytes\n",
4841 i, DEBUG_LOG_SIZE, begin+len);
4847 if (off >= len+begin)
4849 *start = page + (off-begin);
4850 return ((count < begin+len-off) ? count : begin+len-off);
4853 /* Finally, routines used to initialize the serial driver. */
4856 show_serial_version(void)
4859 "ETRAX 100LX serial-driver %s, (c) 2000-2004 Axis Communications AB\r\n",
4860 &serial_version[11]); /* "$Revision: x.yy" */
4863 /* rs_init inits the driver at boot (using the module_init chain) */
4865 static struct tty_operations rs_ops = {
4869 .flush_chars = rs_flush_chars,
4870 .write_room = rs_write_room,
4871 .chars_in_buffer = rs_chars_in_buffer,
4872 .flush_buffer = rs_flush_buffer,
4874 .throttle = rs_throttle,
4875 .unthrottle = rs_unthrottle,
4876 .set_termios = rs_set_termios,
4879 .hangup = rs_hangup,
4880 .break_ctl = rs_break,
4881 .send_xchar = rs_send_xchar,
4882 .wait_until_sent = rs_wait_until_sent,
4883 .read_proc = rs_read_proc,
4890 struct e100_serial *info;
4891 struct tty_driver *driver = alloc_tty_driver(NR_PORTS);
4896 show_serial_version();
4898 /* Setup the timed flush handler system */
4900 #if !defined(CONFIG_ETRAX_SERIAL_FAST_TIMER)
4901 init_timer(&flush_timer);
4902 flush_timer.function = timed_flush_handler;
4903 mod_timer(&flush_timer, jiffies + CONFIG_ETRAX_SERIAL_RX_TIMEOUT_TICKS);
4906 /* Initialize the tty_driver structure */
4908 driver->driver_name = "serial";
4909 driver->name = "ttyS";
4910 driver->major = TTY_MAJOR;
4911 driver->minor_start = 64;
4912 driver->type = TTY_DRIVER_TYPE_SERIAL;
4913 driver->subtype = SERIAL_TYPE_NORMAL;
4914 driver->init_termios = tty_std_termios;
4915 driver->init_termios.c_cflag =
4916 B115200 | CS8 | CREAD | HUPCL | CLOCAL; /* is normally B9600 default... */
4917 driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_NO_DEVFS;
4918 driver->termios = serial_termios;
4919 driver->termios_locked = serial_termios_locked;
4921 tty_set_operations(driver, &rs_ops);
4922 serial_driver = driver;
4923 if (tty_register_driver(driver))
4924 panic("Couldn't register serial driver\n");
4925 /* do some initializing for the separate ports */
4927 for (i = 0, info = rs_table; i < NR_PORTS; i++,info++) {
4928 info->uses_dma_in = 0;
4929 info->uses_dma_out = 0;
4932 info->type = PORT_ETRAX;
4933 info->tr_running = 0;
4934 info->forced_eop = 0;
4935 info->baud_base = DEF_BAUD_BASE;
4936 info->custom_divisor = 0;
4938 info->close_delay = 5*HZ/10;
4939 info->closing_wait = 30*HZ;
4943 info->blocked_open = 0;
4944 info->normal_termios = driver->init_termios;
4945 init_waitqueue_head(&info->open_wait);
4946 init_waitqueue_head(&info->close_wait);
4947 info->xmit.buf = NULL;
4948 info->xmit.tail = info->xmit.head = 0;
4949 info->first_recv_buffer = info->last_recv_buffer = NULL;
4950 info->recv_cnt = info->max_recv_cnt = 0;
4951 info->last_tx_active_usec = 0;
4952 info->last_tx_active = 0;
4954 #if defined(CONFIG_ETRAX_RS485)
4955 /* Set sane defaults */
4956 info->rs485.rts_on_send = 0;
4957 info->rs485.rts_after_sent = 1;
4958 info->rs485.delay_rts_before_send = 0;
4959 info->rs485.enabled = 0;
4961 INIT_WORK(&info->work, do_softint, info);
4963 if (info->enabled) {
4964 printk(KERN_INFO "%s%d at 0x%x is a builtin UART with DMA\n",
4965 serial_driver->name, info->line, (unsigned int)info->port);
4968 #ifdef CONFIG_ETRAX_FAST_TIMER
4969 #ifdef CONFIG_ETRAX_SERIAL_FAST_TIMER
4970 memset(fast_timers, 0, sizeof(fast_timers));
4972 #ifdef CONFIG_ETRAX_RS485
4973 memset(fast_timers_rs485, 0, sizeof(fast_timers_rs485));
4978 #ifndef CONFIG_SVINTO_SIM
4979 /* Not needed in simulator. May only complicate stuff. */
4980 /* hook the irq's for DMA channel 6 and 7, serial output and input, and some more... */
4982 if (request_irq(SERIAL_IRQ_NBR, ser_interrupt, SA_SHIRQ | SA_INTERRUPT, "serial ", NULL))
4985 #ifdef CONFIG_ETRAX_SERIAL_PORT0
4986 #ifdef CONFIG_ETRAX_SERIAL_PORT0_DMA6_OUT
4987 if (request_irq(SER0_DMA_TX_IRQ_NBR, tr_interrupt, SA_INTERRUPT, "serial 0 dma tr", NULL))
4990 #ifdef CONFIG_ETRAX_SERIAL_PORT0_DMA7_IN
4991 if (request_irq(SER0_DMA_RX_IRQ_NBR, rec_interrupt, SA_INTERRUPT, "serial 0 dma rec", NULL))
4996 #ifdef CONFIG_ETRAX_SERIAL_PORT1
4997 #ifdef CONFIG_ETRAX_SERIAL_PORT1_DMA8_OUT
4998 if (request_irq(SER1_DMA_TX_IRQ_NBR, tr_interrupt, SA_INTERRUPT, "serial 1 dma tr", NULL))
5001 #ifdef CONFIG_ETRAX_SERIAL_PORT1_DMA9_IN
5002 if (request_irq(SER1_DMA_RX_IRQ_NBR, rec_interrupt, SA_INTERRUPT, "serial 1 dma rec", NULL))
5006 #ifdef CONFIG_ETRAX_SERIAL_PORT2
5007 /* DMA Shared with par0 (and SCSI0 and ATA) */
5008 #ifdef CONFIG_ETRAX_SERIAL_PORT2_DMA2_OUT
5009 if (request_irq(SER2_DMA_TX_IRQ_NBR, tr_interrupt, SA_SHIRQ | SA_INTERRUPT, "serial 2 dma tr", NULL))
5012 #ifdef CONFIG_ETRAX_SERIAL_PORT2_DMA3_IN
5013 if (request_irq(SER2_DMA_RX_IRQ_NBR, rec_interrupt, SA_SHIRQ | SA_INTERRUPT, "serial 2 dma rec", NULL))
5017 #ifdef CONFIG_ETRAX_SERIAL_PORT3
5018 /* DMA Shared with par1 (and SCSI1 and Extern DMA 0) */
5019 #ifdef CONFIG_ETRAX_SERIAL_PORT3_DMA4_OUT
5020 if (request_irq(SER3_DMA_TX_IRQ_NBR, tr_interrupt, SA_SHIRQ | SA_INTERRUPT, "serial 3 dma tr", NULL))
5023 #ifdef CONFIG_ETRAX_SERIAL_PORT3_DMA5_IN
5024 if (request_irq(SER3_DMA_RX_IRQ_NBR, rec_interrupt, SA_SHIRQ | SA_INTERRUPT, "serial 3 dma rec", NULL))
5029 #ifdef CONFIG_ETRAX_SERIAL_FLUSH_DMA_FAST
5030 if (request_irq(TIMER1_IRQ_NBR, timeout_interrupt, SA_SHIRQ | SA_INTERRUPT,
5031 "fast serial dma timeout", NULL)) {
5032 printk(KERN_CRIT "err: timer1 irq\n");
5035 #endif /* CONFIG_SVINTO_SIM */
5036 debug_write_function = rs_debug_write_function;
5040 /* this makes sure that rs_init is called during kernel boot */
5042 module_init(rs_init);