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ext4: Remove duplicate call to ext4_commit_super() in ext4_freeze()
[linux-2.6/mini2440.git] / drivers / serial / serial_txx9.c
blob7313c2edcb831b873d89156bb6200179dd642fb8
1 /*
2 * drivers/serial/serial_txx9.c
3 *
4 * Derived from many drivers using generic_serial interface,
5 * especially serial_tx3912.c by Steven J. Hill and r39xx_serial.c
6 * (was in Linux/VR tree) by Jim Pick.
7 *
8 * Copyright (C) 1999 Harald Koerfgen
9 * Copyright (C) 2000 Jim Pick <jim@jimpick.com>
10 * Copyright (C) 2001 Steven J. Hill (sjhill@realitydiluted.com)
11 * Copyright (C) 2000-2002 Toshiba Corporation
12 *
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License version 2 as
15 * published by the Free Software Foundation.
16 *
17 * Serial driver for TX3927/TX4927/TX4925/TX4938 internal SIO controller
18 */
19
20 #if defined(CONFIG_SERIAL_TXX9_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
21 #define SUPPORT_SYSRQ
22 #endif
23
24 #include <linux/module.h>
25 #include <linux/ioport.h>
26 #include <linux/init.h>
27 #include <linux/console.h>
28 #include <linux/delay.h>
29 #include <linux/platform_device.h>
30 #include <linux/pci.h>
31 #include <linux/serial_core.h>
32 #include <linux/serial.h>
33
34 #include <asm/io.h>
35
36 static char *serial_version = "1.11";
37 static char *serial_name = "TX39/49 Serial driver";
38
39 #define PASS_LIMIT 256
40
41 #if !defined(CONFIG_SERIAL_TXX9_STDSERIAL)
42 /* "ttyS" is used for standard serial driver */
43 #define TXX9_TTY_NAME "ttyTX"
44 #define TXX9_TTY_MINOR_START 196
45 #define TXX9_TTY_MAJOR 204
46 #else
47 /* acts like standard serial driver */
48 #define TXX9_TTY_NAME "ttyS"
49 #define TXX9_TTY_MINOR_START 64
50 #define TXX9_TTY_MAJOR TTY_MAJOR
51 #endif
52
53 /* flag aliases */
54 #define UPF_TXX9_HAVE_CTS_LINE UPF_BUGGY_UART
55 #define UPF_TXX9_USE_SCLK UPF_MAGIC_MULTIPLIER
56
57 #ifdef CONFIG_PCI
58 /* support for Toshiba TC86C001 SIO */
59 #define ENABLE_SERIAL_TXX9_PCI
60 #endif
61
62 /*
63 * Number of serial ports
64 */
65 #define UART_NR CONFIG_SERIAL_TXX9_NR_UARTS
66
67 struct uart_txx9_port {
68 struct uart_port port;
69 /* No additional info for now */
70 };
71
72 #define TXX9_REGION_SIZE 0x24
73
74 /* TXX9 Serial Registers */
75 #define TXX9_SILCR 0x00
76 #define TXX9_SIDICR 0x04
77 #define TXX9_SIDISR 0x08
78 #define TXX9_SICISR 0x0c
79 #define TXX9_SIFCR 0x10
80 #define TXX9_SIFLCR 0x14
81 #define TXX9_SIBGR 0x18
82 #define TXX9_SITFIFO 0x1c
83 #define TXX9_SIRFIFO 0x20
84
85 /* SILCR : Line Control */
86 #define TXX9_SILCR_SCS_MASK 0x00000060
87 #define TXX9_SILCR_SCS_IMCLK 0x00000000
88 #define TXX9_SILCR_SCS_IMCLK_BG 0x00000020
89 #define TXX9_SILCR_SCS_SCLK 0x00000040
90 #define TXX9_SILCR_SCS_SCLK_BG 0x00000060
91 #define TXX9_SILCR_UEPS 0x00000010
92 #define TXX9_SILCR_UPEN 0x00000008
93 #define TXX9_SILCR_USBL_MASK 0x00000004
94 #define TXX9_SILCR_USBL_1BIT 0x00000000
95 #define TXX9_SILCR_USBL_2BIT 0x00000004
96 #define TXX9_SILCR_UMODE_MASK 0x00000003
97 #define TXX9_SILCR_UMODE_8BIT 0x00000000
98 #define TXX9_SILCR_UMODE_7BIT 0x00000001
99
100 /* SIDICR : DMA/Int. Control */
101 #define TXX9_SIDICR_TDE 0x00008000
102 #define TXX9_SIDICR_RDE 0x00004000
103 #define TXX9_SIDICR_TIE 0x00002000
104 #define TXX9_SIDICR_RIE 0x00001000
105 #define TXX9_SIDICR_SPIE 0x00000800
106 #define TXX9_SIDICR_CTSAC 0x00000600
107 #define TXX9_SIDICR_STIE_MASK 0x0000003f
108 #define TXX9_SIDICR_STIE_OERS 0x00000020
109 #define TXX9_SIDICR_STIE_CTSS 0x00000010
110 #define TXX9_SIDICR_STIE_RBRKD 0x00000008
111 #define TXX9_SIDICR_STIE_TRDY 0x00000004
112 #define TXX9_SIDICR_STIE_TXALS 0x00000002
113 #define TXX9_SIDICR_STIE_UBRKD 0x00000001
114
115 /* SIDISR : DMA/Int. Status */
116 #define TXX9_SIDISR_UBRK 0x00008000
117 #define TXX9_SIDISR_UVALID 0x00004000
118 #define TXX9_SIDISR_UFER 0x00002000
119 #define TXX9_SIDISR_UPER 0x00001000
120 #define TXX9_SIDISR_UOER 0x00000800
121 #define TXX9_SIDISR_ERI 0x00000400
122 #define TXX9_SIDISR_TOUT 0x00000200
123 #define TXX9_SIDISR_TDIS 0x00000100
124 #define TXX9_SIDISR_RDIS 0x00000080
125 #define TXX9_SIDISR_STIS 0x00000040
126 #define TXX9_SIDISR_RFDN_MASK 0x0000001f
127
128 /* SICISR : Change Int. Status */
129 #define TXX9_SICISR_OERS 0x00000020
130 #define TXX9_SICISR_CTSS 0x00000010
131 #define TXX9_SICISR_RBRKD 0x00000008
132 #define TXX9_SICISR_TRDY 0x00000004
133 #define TXX9_SICISR_TXALS 0x00000002
134 #define TXX9_SICISR_UBRKD 0x00000001
135
136 /* SIFCR : FIFO Control */
137 #define TXX9_SIFCR_SWRST 0x00008000
138 #define TXX9_SIFCR_RDIL_MASK 0x00000180
139 #define TXX9_SIFCR_RDIL_1 0x00000000
140 #define TXX9_SIFCR_RDIL_4 0x00000080
141 #define TXX9_SIFCR_RDIL_8 0x00000100
142 #define TXX9_SIFCR_RDIL_12 0x00000180
143 #define TXX9_SIFCR_RDIL_MAX 0x00000180
144 #define TXX9_SIFCR_TDIL_MASK 0x00000018
145 #define TXX9_SIFCR_TDIL_MASK 0x00000018
146 #define TXX9_SIFCR_TDIL_1 0x00000000
147 #define TXX9_SIFCR_TDIL_4 0x00000001
148 #define TXX9_SIFCR_TDIL_8 0x00000010
149 #define TXX9_SIFCR_TDIL_MAX 0x00000010
150 #define TXX9_SIFCR_TFRST 0x00000004
151 #define TXX9_SIFCR_RFRST 0x00000002
152 #define TXX9_SIFCR_FRSTE 0x00000001
153 #define TXX9_SIO_TX_FIFO 8
154 #define TXX9_SIO_RX_FIFO 16
155
156 /* SIFLCR : Flow Control */
157 #define TXX9_SIFLCR_RCS 0x00001000
158 #define TXX9_SIFLCR_TES 0x00000800
159 #define TXX9_SIFLCR_RTSSC 0x00000200
160 #define TXX9_SIFLCR_RSDE 0x00000100
161 #define TXX9_SIFLCR_TSDE 0x00000080
162 #define TXX9_SIFLCR_RTSTL_MASK 0x0000001e
163 #define TXX9_SIFLCR_RTSTL_MAX 0x0000001e
164 #define TXX9_SIFLCR_TBRK 0x00000001
165
166 /* SIBGR : Baudrate Control */
167 #define TXX9_SIBGR_BCLK_MASK 0x00000300
168 #define TXX9_SIBGR_BCLK_T0 0x00000000
169 #define TXX9_SIBGR_BCLK_T2 0x00000100
170 #define TXX9_SIBGR_BCLK_T4 0x00000200
171 #define TXX9_SIBGR_BCLK_T6 0x00000300
172 #define TXX9_SIBGR_BRD_MASK 0x000000ff
173
174 static inline unsigned int sio_in(struct uart_txx9_port *up, int offset)
175 {
176 switch (up->port.iotype) {
177 default:
178 return __raw_readl(up->port.membase + offset);
179 case UPIO_PORT:
180 return inl(up->port.iobase + offset);
181 }
182 }
183
184 static inline void
185 sio_out(struct uart_txx9_port *up, int offset, int value)
186 {
187 switch (up->port.iotype) {
188 default:
189 __raw_writel(value, up->port.membase + offset);
190 break;
191 case UPIO_PORT:
192 outl(value, up->port.iobase + offset);
193 break;
194 }
195 }
196
197 static inline void
198 sio_mask(struct uart_txx9_port *up, int offset, unsigned int value)
199 {
200 sio_out(up, offset, sio_in(up, offset) & ~value);
201 }
202 static inline void
203 sio_set(struct uart_txx9_port *up, int offset, unsigned int value)
204 {
205 sio_out(up, offset, sio_in(up, offset) | value);
206 }
207
208 static inline void
209 sio_quot_set(struct uart_txx9_port *up, int quot)
210 {
211 quot >>= 1;
212 if (quot < 256)
213 sio_out(up, TXX9_SIBGR, quot | TXX9_SIBGR_BCLK_T0);
214 else if (quot < (256 << 2))
215 sio_out(up, TXX9_SIBGR, (quot >> 2) | TXX9_SIBGR_BCLK_T2);
216 else if (quot < (256 << 4))
217 sio_out(up, TXX9_SIBGR, (quot >> 4) | TXX9_SIBGR_BCLK_T4);
218 else if (quot < (256 << 6))
219 sio_out(up, TXX9_SIBGR, (quot >> 6) | TXX9_SIBGR_BCLK_T6);
220 else
221 sio_out(up, TXX9_SIBGR, 0xff | TXX9_SIBGR_BCLK_T6);
222 }
223
224 static void serial_txx9_stop_tx(struct uart_port *port)
225 {
226 struct uart_txx9_port *up = (struct uart_txx9_port *)port;
227 sio_mask(up, TXX9_SIDICR, TXX9_SIDICR_TIE);
228 }
229
230 static void serial_txx9_start_tx(struct uart_port *port)
231 {
232 struct uart_txx9_port *up = (struct uart_txx9_port *)port;
233 sio_set(up, TXX9_SIDICR, TXX9_SIDICR_TIE);
234 }
235
236 static void serial_txx9_stop_rx(struct uart_port *port)
237 {
238 struct uart_txx9_port *up = (struct uart_txx9_port *)port;
239 up->port.read_status_mask &= ~TXX9_SIDISR_RDIS;
240 }
241
242 static void serial_txx9_enable_ms(struct uart_port *port)
243 {
244 /* TXX9-SIO can not control DTR... */
245 }
246
247 static void serial_txx9_initialize(struct uart_port *port)
248 {
249 struct uart_txx9_port *up = (struct uart_txx9_port *)port;
250 unsigned int tmout = 10000;
251
252 sio_out(up, TXX9_SIFCR, TXX9_SIFCR_SWRST);
253 /* TX4925 BUG WORKAROUND. Accessing SIOC register
254 * immediately after soft reset causes bus error. */
255 mmiowb();
256 udelay(1);
257 while ((sio_in(up, TXX9_SIFCR) & TXX9_SIFCR_SWRST) && --tmout)
258 udelay(1);
259 /* TX Int by FIFO Empty, RX Int by Receiving 1 char. */
260 sio_set(up, TXX9_SIFCR,
261 TXX9_SIFCR_TDIL_MAX | TXX9_SIFCR_RDIL_1);
262 /* initial settings */
263 sio_out(up, TXX9_SILCR,
264 TXX9_SILCR_UMODE_8BIT | TXX9_SILCR_USBL_1BIT |
265 ((up->port.flags & UPF_TXX9_USE_SCLK) ?
266 TXX9_SILCR_SCS_SCLK_BG : TXX9_SILCR_SCS_IMCLK_BG));
267 sio_quot_set(up, uart_get_divisor(port, 9600));
268 sio_out(up, TXX9_SIFLCR, TXX9_SIFLCR_RTSTL_MAX /* 15 */);
269 sio_out(up, TXX9_SIDICR, 0);
270 }
271
272 static inline void
273 receive_chars(struct uart_txx9_port *up, unsigned int *status)
274 {
275 struct tty_struct *tty = up->port.info->port.tty;
276 unsigned char ch;
277 unsigned int disr = *status;
278 int max_count = 256;
279 char flag;
280 unsigned int next_ignore_status_mask;
281
282 do {
283 ch = sio_in(up, TXX9_SIRFIFO);
284 flag = TTY_NORMAL;
285 up->port.icount.rx++;
286
287 /* mask out RFDN_MASK bit added by previous overrun */
288 next_ignore_status_mask =
289 up->port.ignore_status_mask & ~TXX9_SIDISR_RFDN_MASK;
290 if (unlikely(disr & (TXX9_SIDISR_UBRK | TXX9_SIDISR_UPER |
291 TXX9_SIDISR_UFER | TXX9_SIDISR_UOER))) {
292 /*
293 * For statistics only
294 */
295 if (disr & TXX9_SIDISR_UBRK) {
296 disr &= ~(TXX9_SIDISR_UFER | TXX9_SIDISR_UPER);
297 up->port.icount.brk++;
298 /*
299 * We do the SysRQ and SAK checking
300 * here because otherwise the break
301 * may get masked by ignore_status_mask
302 * or read_status_mask.
303 */
304 if (uart_handle_break(&up->port))
305 goto ignore_char;
306 } else if (disr & TXX9_SIDISR_UPER)
307 up->port.icount.parity++;
308 else if (disr & TXX9_SIDISR_UFER)
309 up->port.icount.frame++;
310 if (disr & TXX9_SIDISR_UOER) {
311 up->port.icount.overrun++;
312 /*
313 * The receiver read buffer still hold
314 * a char which caused overrun.
315 * Ignore next char by adding RFDN_MASK
316 * to ignore_status_mask temporarily.
317 */
318 next_ignore_status_mask |=
319 TXX9_SIDISR_RFDN_MASK;
320 }
321
322 /*
323 * Mask off conditions which should be ingored.
324 */
325 disr &= up->port.read_status_mask;
326
327 if (disr & TXX9_SIDISR_UBRK) {
328 flag = TTY_BREAK;
329 } else if (disr & TXX9_SIDISR_UPER)
330 flag = TTY_PARITY;
331 else if (disr & TXX9_SIDISR_UFER)
332 flag = TTY_FRAME;
333 }
334 if (uart_handle_sysrq_char(&up->port, ch))
335 goto ignore_char;
336
337 uart_insert_char(&up->port, disr, TXX9_SIDISR_UOER, ch, flag);
338
339 ignore_char:
340 up->port.ignore_status_mask = next_ignore_status_mask;
341 disr = sio_in(up, TXX9_SIDISR);
342 } while (!(disr & TXX9_SIDISR_UVALID) && (max_count-- > 0));
343 spin_unlock(&up->port.lock);
344 tty_flip_buffer_push(tty);
345 spin_lock(&up->port.lock);
346 *status = disr;
347 }
348
349 static inline void transmit_chars(struct uart_txx9_port *up)
350 {
351 struct circ_buf *xmit = &up->port.info->xmit;
352 int count;
353
354 if (up->port.x_char) {
355 sio_out(up, TXX9_SITFIFO, up->port.x_char);
356 up->port.icount.tx++;
357 up->port.x_char = 0;
358 return;
359 }
360 if (uart_circ_empty(xmit) || uart_tx_stopped(&up->port)) {
361 serial_txx9_stop_tx(&up->port);
362 return;
363 }
364
365 count = TXX9_SIO_TX_FIFO;
366 do {
367 sio_out(up, TXX9_SITFIFO, xmit->buf[xmit->tail]);
368 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
369 up->port.icount.tx++;
370 if (uart_circ_empty(xmit))
371 break;
372 } while (--count > 0);
373
374 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
375 uart_write_wakeup(&up->port);
376
377 if (uart_circ_empty(xmit))
378 serial_txx9_stop_tx(&up->port);
379 }
380
381 static irqreturn_t serial_txx9_interrupt(int irq, void *dev_id)
382 {
383 int pass_counter = 0;
384 struct uart_txx9_port *up = dev_id;
385 unsigned int status;
386
387 while (1) {
388 spin_lock(&up->port.lock);
389 status = sio_in(up, TXX9_SIDISR);
390 if (!(sio_in(up, TXX9_SIDICR) & TXX9_SIDICR_TIE))
391 status &= ~TXX9_SIDISR_TDIS;
392 if (!(status & (TXX9_SIDISR_TDIS | TXX9_SIDISR_RDIS |
393 TXX9_SIDISR_TOUT))) {
394 spin_unlock(&up->port.lock);
395 break;
396 }
397
398 if (status & TXX9_SIDISR_RDIS)
399 receive_chars(up, &status);
400 if (status & TXX9_SIDISR_TDIS)
401 transmit_chars(up);
402 /* Clear TX/RX Int. Status */
403 sio_mask(up, TXX9_SIDISR,
404 TXX9_SIDISR_TDIS | TXX9_SIDISR_RDIS |
405 TXX9_SIDISR_TOUT);
406 spin_unlock(&up->port.lock);
407
408 if (pass_counter++ > PASS_LIMIT)
409 break;
410 }
411
412 return pass_counter ? IRQ_HANDLED : IRQ_NONE;
413 }
414
415 static unsigned int serial_txx9_tx_empty(struct uart_port *port)
416 {
417 struct uart_txx9_port *up = (struct uart_txx9_port *)port;
418 unsigned long flags;
419 unsigned int ret;
420
421 spin_lock_irqsave(&up->port.lock, flags);
422 ret = (sio_in(up, TXX9_SICISR) & TXX9_SICISR_TXALS) ? TIOCSER_TEMT : 0;
423 spin_unlock_irqrestore(&up->port.lock, flags);
424
425 return ret;
426 }
427
428 static unsigned int serial_txx9_get_mctrl(struct uart_port *port)
429 {
430 struct uart_txx9_port *up = (struct uart_txx9_port *)port;
431 unsigned int ret;
432
433 /* no modem control lines */
434 ret = TIOCM_CAR | TIOCM_DSR;
435 ret |= (sio_in(up, TXX9_SIFLCR) & TXX9_SIFLCR_RTSSC) ? 0 : TIOCM_RTS;
436 ret |= (sio_in(up, TXX9_SICISR) & TXX9_SICISR_CTSS) ? 0 : TIOCM_CTS;
437
438 return ret;
439 }
440
441 static void serial_txx9_set_mctrl(struct uart_port *port, unsigned int mctrl)
442 {
443 struct uart_txx9_port *up = (struct uart_txx9_port *)port;
444
445 if (mctrl & TIOCM_RTS)
446 sio_mask(up, TXX9_SIFLCR, TXX9_SIFLCR_RTSSC);
447 else
448 sio_set(up, TXX9_SIFLCR, TXX9_SIFLCR_RTSSC);
449 }
450
451 static void serial_txx9_break_ctl(struct uart_port *port, int break_state)
452 {
453 struct uart_txx9_port *up = (struct uart_txx9_port *)port;
454 unsigned long flags;
455
456 spin_lock_irqsave(&up->port.lock, flags);
457 if (break_state == -1)
458 sio_set(up, TXX9_SIFLCR, TXX9_SIFLCR_TBRK);
459 else
460 sio_mask(up, TXX9_SIFLCR, TXX9_SIFLCR_TBRK);
461 spin_unlock_irqrestore(&up->port.lock, flags);
462 }
463
464 static int serial_txx9_startup(struct uart_port *port)
465 {
466 struct uart_txx9_port *up = (struct uart_txx9_port *)port;
467 unsigned long flags;
468 int retval;
469
470 /*
471 * Clear the FIFO buffers and disable them.
472 * (they will be reenabled in set_termios())
473 */
474 sio_set(up, TXX9_SIFCR,
475 TXX9_SIFCR_TFRST | TXX9_SIFCR_RFRST | TXX9_SIFCR_FRSTE);
476 /* clear reset */
477 sio_mask(up, TXX9_SIFCR,
478 TXX9_SIFCR_TFRST | TXX9_SIFCR_RFRST | TXX9_SIFCR_FRSTE);
479 sio_out(up, TXX9_SIDICR, 0);
480
481 /*
482 * Clear the interrupt registers.
483 */
484 sio_out(up, TXX9_SIDISR, 0);
485
486 retval = request_irq(up->port.irq, serial_txx9_interrupt,
487 IRQF_SHARED, "serial_txx9", up);
488 if (retval)
489 return retval;
490
491 /*
492 * Now, initialize the UART
493 */
494 spin_lock_irqsave(&up->port.lock, flags);
495 serial_txx9_set_mctrl(&up->port, up->port.mctrl);
496 spin_unlock_irqrestore(&up->port.lock, flags);
497
498 /* Enable RX/TX */
499 sio_mask(up, TXX9_SIFLCR, TXX9_SIFLCR_RSDE | TXX9_SIFLCR_TSDE);
500
501 /*
502 * Finally, enable interrupts.
503 */
504 sio_set(up, TXX9_SIDICR, TXX9_SIDICR_RIE);
505
506 return 0;
507 }
508
509 static void serial_txx9_shutdown(struct uart_port *port)
510 {
511 struct uart_txx9_port *up = (struct uart_txx9_port *)port;
512 unsigned long flags;
513
514 /*
515 * Disable interrupts from this port
516 */
517 sio_out(up, TXX9_SIDICR, 0); /* disable all intrs */
518
519 spin_lock_irqsave(&up->port.lock, flags);
520 serial_txx9_set_mctrl(&up->port, up->port.mctrl);
521 spin_unlock_irqrestore(&up->port.lock, flags);
522
523 /*
524 * Disable break condition
525 */
526 sio_mask(up, TXX9_SIFLCR, TXX9_SIFLCR_TBRK);
527
528 #ifdef CONFIG_SERIAL_TXX9_CONSOLE
529 if (up->port.cons && up->port.line == up->port.cons->index) {
530 free_irq(up->port.irq, up);
531 return;
532 }
533 #endif
534 /* reset FIFOs */
535 sio_set(up, TXX9_SIFCR,
536 TXX9_SIFCR_TFRST | TXX9_SIFCR_RFRST | TXX9_SIFCR_FRSTE);
537 /* clear reset */
538 sio_mask(up, TXX9_SIFCR,
539 TXX9_SIFCR_TFRST | TXX9_SIFCR_RFRST | TXX9_SIFCR_FRSTE);
540
541 /* Disable RX/TX */
542 sio_set(up, TXX9_SIFLCR, TXX9_SIFLCR_RSDE | TXX9_SIFLCR_TSDE);
543
544 free_irq(up->port.irq, up);
545 }
546
547 static void
548 serial_txx9_set_termios(struct uart_port *port, struct ktermios *termios,
549 struct ktermios *old)
550 {
551 struct uart_txx9_port *up = (struct uart_txx9_port *)port;
552 unsigned int cval, fcr = 0;
553 unsigned long flags;
554 unsigned int baud, quot;
555
556 /*
557 * We don't support modem control lines.
558 */
559 termios->c_cflag &= ~(HUPCL | CMSPAR);
560 termios->c_cflag |= CLOCAL;
561
562 cval = sio_in(up, TXX9_SILCR);
563 /* byte size and parity */
564 cval &= ~TXX9_SILCR_UMODE_MASK;
565 switch (termios->c_cflag & CSIZE) {
566 case CS7:
567 cval |= TXX9_SILCR_UMODE_7BIT;
568 break;
569 default:
570 case CS5: /* not supported */
571 case CS6: /* not supported */
572 case CS8:
573 cval |= TXX9_SILCR_UMODE_8BIT;
574 break;
575 }
576
577 cval &= ~TXX9_SILCR_USBL_MASK;
578 if (termios->c_cflag & CSTOPB)
579 cval |= TXX9_SILCR_USBL_2BIT;
580 else
581 cval |= TXX9_SILCR_USBL_1BIT;
582 cval &= ~(TXX9_SILCR_UPEN | TXX9_SILCR_UEPS);
583 if (termios->c_cflag & PARENB)
584 cval |= TXX9_SILCR_UPEN;
585 if (!(termios->c_cflag & PARODD))
586 cval |= TXX9_SILCR_UEPS;
587
588 /*
589 * Ask the core to calculate the divisor for us.
590 */
591 baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16/2);
592 quot = uart_get_divisor(port, baud);
593
594 /* Set up FIFOs */
595 /* TX Int by FIFO Empty, RX Int by Receiving 1 char. */
596 fcr = TXX9_SIFCR_TDIL_MAX | TXX9_SIFCR_RDIL_1;
597
598 /*
599 * Ok, we're now changing the port state. Do it with
600 * interrupts disabled.
601 */
602 spin_lock_irqsave(&up->port.lock, flags);
603
604 /*
605 * Update the per-port timeout.
606 */
607 uart_update_timeout(port, termios->c_cflag, baud);
608
609 up->port.read_status_mask = TXX9_SIDISR_UOER |
610 TXX9_SIDISR_TDIS | TXX9_SIDISR_RDIS;
611 if (termios->c_iflag & INPCK)
612 up->port.read_status_mask |= TXX9_SIDISR_UFER | TXX9_SIDISR_UPER;
613 if (termios->c_iflag & (BRKINT | PARMRK))
614 up->port.read_status_mask |= TXX9_SIDISR_UBRK;
615
616 /*
617 * Characteres to ignore
618 */
619 up->port.ignore_status_mask = 0;
620 if (termios->c_iflag & IGNPAR)
621 up->port.ignore_status_mask |= TXX9_SIDISR_UPER | TXX9_SIDISR_UFER;
622 if (termios->c_iflag & IGNBRK) {
623 up->port.ignore_status_mask |= TXX9_SIDISR_UBRK;
624 /*
625 * If we're ignoring parity and break indicators,
626 * ignore overruns too (for real raw support).
627 */
628 if (termios->c_iflag & IGNPAR)
629 up->port.ignore_status_mask |= TXX9_SIDISR_UOER;
630 }
631
632 /*
633 * ignore all characters if CREAD is not set
634 */
635 if ((termios->c_cflag & CREAD) == 0)
636 up->port.ignore_status_mask |= TXX9_SIDISR_RDIS;
637
638 /* CTS flow control flag */
639 if ((termios->c_cflag & CRTSCTS) &&
640 (up->port.flags & UPF_TXX9_HAVE_CTS_LINE)) {
641 sio_set(up, TXX9_SIFLCR,
642 TXX9_SIFLCR_RCS | TXX9_SIFLCR_TES);
643 } else {
644 sio_mask(up, TXX9_SIFLCR,
645 TXX9_SIFLCR_RCS | TXX9_SIFLCR_TES);
646 }
647
648 sio_out(up, TXX9_SILCR, cval);
649 sio_quot_set(up, quot);
650 sio_out(up, TXX9_SIFCR, fcr);
651
652 serial_txx9_set_mctrl(&up->port, up->port.mctrl);
653 spin_unlock_irqrestore(&up->port.lock, flags);
654 }
655
656 static void
657 serial_txx9_pm(struct uart_port *port, unsigned int state,
658 unsigned int oldstate)
659 {
660 /*
661 * If oldstate was -1 this is called from
662 * uart_configure_port(). In this case do not initialize the
663 * port now, because the port was already initialized (for
664 * non-console port) or should not be initialized here (for
665 * console port). If we initialized the port here we lose
666 * serial console settings.
667 */
668 if (state == 0 && oldstate != -1)
669 serial_txx9_initialize(port);
670 }
671
672 static int serial_txx9_request_resource(struct uart_txx9_port *up)
673 {
674 unsigned int size = TXX9_REGION_SIZE;
675 int ret = 0;
676
677 switch (up->port.iotype) {
678 default:
679 if (!up->port.mapbase)
680 break;
681
682 if (!request_mem_region(up->port.mapbase, size, "serial_txx9")) {
683 ret = -EBUSY;
684 break;
685 }
686
687 if (up->port.flags & UPF_IOREMAP) {
688 up->port.membase = ioremap(up->port.mapbase, size);
689 if (!up->port.membase) {
690 release_mem_region(up->port.mapbase, size);
691 ret = -ENOMEM;
692 }
693 }
694 break;
695
696 case UPIO_PORT:
697 if (!request_region(up->port.iobase, size, "serial_txx9"))
698 ret = -EBUSY;
699 break;
700 }
701 return ret;
702 }
703
704 static void serial_txx9_release_resource(struct uart_txx9_port *up)
705 {
706 unsigned int size = TXX9_REGION_SIZE;
707
708 switch (up->port.iotype) {
709 default:
710 if (!up->port.mapbase)
711 break;
712
713 if (up->port.flags & UPF_IOREMAP) {
714 iounmap(up->port.membase);
715 up->port.membase = NULL;
716 }
717
718 release_mem_region(up->port.mapbase, size);
719 break;
720
721 case UPIO_PORT:
722 release_region(up->port.iobase, size);
723 break;
724 }
725 }
726
727 static void serial_txx9_release_port(struct uart_port *port)
728 {
729 struct uart_txx9_port *up = (struct uart_txx9_port *)port;
730 serial_txx9_release_resource(up);
731 }
732
733 static int serial_txx9_request_port(struct uart_port *port)
734 {
735 struct uart_txx9_port *up = (struct uart_txx9_port *)port;
736 return serial_txx9_request_resource(up);
737 }
738
739 static void serial_txx9_config_port(struct uart_port *port, int uflags)
740 {
741 struct uart_txx9_port *up = (struct uart_txx9_port *)port;
742 int ret;
743
744 /*
745 * Find the region that we can probe for. This in turn
746 * tells us whether we can probe for the type of port.
747 */
748 ret = serial_txx9_request_resource(up);
749 if (ret < 0)
750 return;
751 port->type = PORT_TXX9;
752 up->port.fifosize = TXX9_SIO_TX_FIFO;
753
754 #ifdef CONFIG_SERIAL_TXX9_CONSOLE
755 if (up->port.line == up->port.cons->index)
756 return;
757 #endif
758 serial_txx9_initialize(port);
759 }
760
761 static const char *
762 serial_txx9_type(struct uart_port *port)
763 {
764 return "txx9";
765 }
766
767 static struct uart_ops serial_txx9_pops = {
768 .tx_empty = serial_txx9_tx_empty,
769 .set_mctrl = serial_txx9_set_mctrl,
770 .get_mctrl = serial_txx9_get_mctrl,
771 .stop_tx = serial_txx9_stop_tx,
772 .start_tx = serial_txx9_start_tx,
773 .stop_rx = serial_txx9_stop_rx,
774 .enable_ms = serial_txx9_enable_ms,
775 .break_ctl = serial_txx9_break_ctl,
776 .startup = serial_txx9_startup,
777 .shutdown = serial_txx9_shutdown,
778 .set_termios = serial_txx9_set_termios,
779 .pm = serial_txx9_pm,
780 .type = serial_txx9_type,
781 .release_port = serial_txx9_release_port,
782 .request_port = serial_txx9_request_port,
783 .config_port = serial_txx9_config_port,
784 };
785
786 static struct uart_txx9_port serial_txx9_ports[UART_NR];
787
788 static void __init serial_txx9_register_ports(struct uart_driver *drv,
789 struct device *dev)
790 {
791 int i;
792
793 for (i = 0; i < UART_NR; i++) {
794 struct uart_txx9_port *up = &serial_txx9_ports[i];
795
796 up->port.line = i;
797 up->port.ops = &serial_txx9_pops;
798 up->port.dev = dev;
799 if (up->port.iobase || up->port.mapbase)
800 uart_add_one_port(drv, &up->port);
801 }
802 }
803
804 #ifdef CONFIG_SERIAL_TXX9_CONSOLE
805
806 /*
807 * Wait for transmitter & holding register to empty
808 */
809 static inline void wait_for_xmitr(struct uart_txx9_port *up)
810 {
811 unsigned int tmout = 10000;
812
813 /* Wait up to 10ms for the character(s) to be sent. */
814 while (--tmout &&
815 !(sio_in(up, TXX9_SICISR) & TXX9_SICISR_TXALS))
816 udelay(1);
817
818 /* Wait up to 1s for flow control if necessary */
819 if (up->port.flags & UPF_CONS_FLOW) {
820 tmout = 1000000;
821 while (--tmout &&
822 (sio_in(up, TXX9_SICISR) & TXX9_SICISR_CTSS))
823 udelay(1);
824 }
825 }
826
827 static void serial_txx9_console_putchar(struct uart_port *port, int ch)
828 {
829 struct uart_txx9_port *up = (struct uart_txx9_port *)port;
830
831 wait_for_xmitr(up);
832 sio_out(up, TXX9_SITFIFO, ch);
833 }
834
835 /*
836 * Print a string to the serial port trying not to disturb
837 * any possible real use of the port...
838 *
839 * The console_lock must be held when we get here.
840 */
841 static void
842 serial_txx9_console_write(struct console *co, const char *s, unsigned int count)
843 {
844 struct uart_txx9_port *up = &serial_txx9_ports[co->index];
845 unsigned int ier, flcr;
846
847 /*
848 * First save the UER then disable the interrupts
849 */
850 ier = sio_in(up, TXX9_SIDICR);
851 sio_out(up, TXX9_SIDICR, 0);
852 /*
853 * Disable flow-control if enabled (and unnecessary)
854 */
855 flcr = sio_in(up, TXX9_SIFLCR);
856 if (!(up->port.flags & UPF_CONS_FLOW) && (flcr & TXX9_SIFLCR_TES))
857 sio_out(up, TXX9_SIFLCR, flcr & ~TXX9_SIFLCR_TES);
858
859 uart_console_write(&up->port, s, count, serial_txx9_console_putchar);
860
861 /*
862 * Finally, wait for transmitter to become empty
863 * and restore the IER
864 */
865 wait_for_xmitr(up);
866 sio_out(up, TXX9_SIFLCR, flcr);
867 sio_out(up, TXX9_SIDICR, ier);
868 }
869
870 static int __init serial_txx9_console_setup(struct console *co, char *options)
871 {
872 struct uart_port *port;
873 struct uart_txx9_port *up;
874 int baud = 9600;
875 int bits = 8;
876 int parity = 'n';
877 int flow = 'n';
878
879 /*
880 * Check whether an invalid uart number has been specified, and
881 * if so, search for the first available port that does have
882 * console support.
883 */
884 if (co->index >= UART_NR)
885 co->index = 0;
886 up = &serial_txx9_ports[co->index];
887 port = &up->port;
888 if (!port->ops)
889 return -ENODEV;
890
891 serial_txx9_initialize(&up->port);
892
893 if (options)
894 uart_parse_options(options, &baud, &parity, &bits, &flow);
895
896 return uart_set_options(port, co, baud, parity, bits, flow);
897 }
898
899 static struct uart_driver serial_txx9_reg;
900 static struct console serial_txx9_console = {
901 .name = TXX9_TTY_NAME,
902 .write = serial_txx9_console_write,
903 .device = uart_console_device,
904 .setup = serial_txx9_console_setup,
905 .flags = CON_PRINTBUFFER,
906 .index = -1,
907 .data = &serial_txx9_reg,
908 };
909
910 static int __init serial_txx9_console_init(void)
911 {
912 register_console(&serial_txx9_console);
913 return 0;
914 }
915 console_initcall(serial_txx9_console_init);
916
917 #define SERIAL_TXX9_CONSOLE &serial_txx9_console
918 #else
919 #define SERIAL_TXX9_CONSOLE NULL
920 #endif
921
922 static struct uart_driver serial_txx9_reg = {
923 .owner = THIS_MODULE,
924 .driver_name = "serial_txx9",
925 .dev_name = TXX9_TTY_NAME,
926 .major = TXX9_TTY_MAJOR,
927 .minor = TXX9_TTY_MINOR_START,
928 .nr = UART_NR,
929 .cons = SERIAL_TXX9_CONSOLE,
930 };
931
932 int __init early_serial_txx9_setup(struct uart_port *port)
933 {
934 if (port->line >= ARRAY_SIZE(serial_txx9_ports))
935 return -ENODEV;
936
937 serial_txx9_ports[port->line].port = *port;
938 serial_txx9_ports[port->line].port.ops = &serial_txx9_pops;
939 serial_txx9_ports[port->line].port.flags |=
940 UPF_BOOT_AUTOCONF | UPF_FIXED_PORT;
941 return 0;
942 }
943
944 static DEFINE_MUTEX(serial_txx9_mutex);
945
946 /**
947 * serial_txx9_register_port - register a serial port
948 * @port: serial port template
949 *
950 * Configure the serial port specified by the request.
951 *
952 * The port is then probed and if necessary the IRQ is autodetected
953 * If this fails an error is returned.
954 *
955 * On success the port is ready to use and the line number is returned.
956 */
957 static int __devinit serial_txx9_register_port(struct uart_port *port)
958 {
959 int i;
960 struct uart_txx9_port *uart;
961 int ret = -ENOSPC;
962
963 mutex_lock(&serial_txx9_mutex);
964 for (i = 0; i < UART_NR; i++) {
965 uart = &serial_txx9_ports[i];
966 if (uart_match_port(&uart->port, port)) {
967 uart_remove_one_port(&serial_txx9_reg, &uart->port);
968 break;
969 }
970 }
971 if (i == UART_NR) {
972 /* Find unused port */
973 for (i = 0; i < UART_NR; i++) {
974 uart = &serial_txx9_ports[i];
975 if (!(uart->port.iobase || uart->port.mapbase))
976 break;
977 }
978 }
979 if (i < UART_NR) {
980 uart->port.iobase = port->iobase;
981 uart->port.membase = port->membase;
982 uart->port.irq = port->irq;
983 uart->port.uartclk = port->uartclk;
984 uart->port.iotype = port->iotype;
985 uart->port.flags = port->flags
986 | UPF_BOOT_AUTOCONF | UPF_FIXED_PORT;
987 uart->port.mapbase = port->mapbase;
988 if (port->dev)
989 uart->port.dev = port->dev;
990 ret = uart_add_one_port(&serial_txx9_reg, &uart->port);
991 if (ret == 0)
992 ret = uart->port.line;
993 }
994 mutex_unlock(&serial_txx9_mutex);
995 return ret;
996 }
997
998 /**
999 * serial_txx9_unregister_port - remove a txx9 serial port at runtime
1000 * @line: serial line number
1001 *
1002 * Remove one serial port. This may not be called from interrupt
1003 * context. We hand the port back to the our control.
1004 */
1005 static void __devexit serial_txx9_unregister_port(int line)
1006 {
1007 struct uart_txx9_port *uart = &serial_txx9_ports[line];
1008
1009 mutex_lock(&serial_txx9_mutex);
1010 uart_remove_one_port(&serial_txx9_reg, &uart->port);
1011 uart->port.flags = 0;
1012 uart->port.type = PORT_UNKNOWN;
1013 uart->port.iobase = 0;
1014 uart->port.mapbase = 0;
1015 uart->port.membase = NULL;
1016 uart->port.dev = NULL;
1017 mutex_unlock(&serial_txx9_mutex);
1018 }
1019
1020 /*
1021 * Register a set of serial devices attached to a platform device.
1022 */
1023 static int __devinit serial_txx9_probe(struct platform_device *dev)
1024 {
1025 struct uart_port *p = dev->dev.platform_data;
1026 struct uart_port port;
1027 int ret, i;
1028
1029 memset(&port, 0, sizeof(struct uart_port));
1030 for (i = 0; p && p->uartclk != 0; p++, i++) {
1031 port.iobase = p->iobase;
1032 port.membase = p->membase;
1033 port.irq = p->irq;
1034 port.uartclk = p->uartclk;
1035 port.iotype = p->iotype;
1036 port.flags = p->flags;
1037 port.mapbase = p->mapbase;
1038 port.dev = &dev->dev;
1039 ret = serial_txx9_register_port(&port);
1040 if (ret < 0) {
1041 dev_err(&dev->dev, "unable to register port at index %d "
1042 "(IO%lx MEM%llx IRQ%d): %d\n", i,
1043 p->iobase, (unsigned long long)p->mapbase,
1044 p->irq, ret);
1045 }
1046 }
1047 return 0;
1048 }
1049
1050 /*
1051 * Remove serial ports registered against a platform device.
1052 */
1053 static int __devexit serial_txx9_remove(struct platform_device *dev)
1054 {
1055 int i;
1056
1057 for (i = 0; i < UART_NR; i++) {
1058 struct uart_txx9_port *up = &serial_txx9_ports[i];
1059
1060 if (up->port.dev == &dev->dev)
1061 serial_txx9_unregister_port(i);
1062 }
1063 return 0;
1064 }
1065
1066 #ifdef CONFIG_PM
1067 static int serial_txx9_suspend(struct platform_device *dev, pm_message_t state)
1068 {
1069 int i;
1070
1071 for (i = 0; i < UART_NR; i++) {
1072 struct uart_txx9_port *up = &serial_txx9_ports[i];
1073
1074 if (up->port.type != PORT_UNKNOWN && up->port.dev == &dev->dev)
1075 uart_suspend_port(&serial_txx9_reg, &up->port);
1076 }
1077
1078 return 0;
1079 }
1080
1081 static int serial_txx9_resume(struct platform_device *dev)
1082 {
1083 int i;
1084
1085 for (i = 0; i < UART_NR; i++) {
1086 struct uart_txx9_port *up = &serial_txx9_ports[i];
1087
1088 if (up->port.type != PORT_UNKNOWN && up->port.dev == &dev->dev)
1089 uart_resume_port(&serial_txx9_reg, &up->port);
1090 }
1091
1092 return 0;
1093 }
1094 #endif
1095
1096 static struct platform_driver serial_txx9_plat_driver = {
1097 .probe = serial_txx9_probe,
1098 .remove = __devexit_p(serial_txx9_remove),
1099 #ifdef CONFIG_PM
1100 .suspend = serial_txx9_suspend,
1101 .resume = serial_txx9_resume,
1102 #endif
1103 .driver = {
1104 .name = "serial_txx9",
1105 .owner = THIS_MODULE,
1106 },
1107 };
1108
1109 #ifdef ENABLE_SERIAL_TXX9_PCI
1110 /*
1111 * Probe one serial board. Unfortunately, there is no rhyme nor reason
1112 * to the arrangement of serial ports on a PCI card.
1113 */
1114 static int __devinit
1115 pciserial_txx9_init_one(struct pci_dev *dev, const struct pci_device_id *ent)
1116 {
1117 struct uart_port port;
1118 int line;
1119 int rc;
1120
1121 rc = pci_enable_device(dev);
1122 if (rc)
1123 return rc;
1124
1125 memset(&port, 0, sizeof(port));
1126 port.ops = &serial_txx9_pops;
1127 port.flags |= UPF_TXX9_HAVE_CTS_LINE;
1128 port.uartclk = 66670000;
1129 port.irq = dev->irq;
1130 port.iotype = UPIO_PORT;
1131 port.iobase = pci_resource_start(dev, 1);
1132 port.dev = &dev->dev;
1133 line = serial_txx9_register_port(&port);
1134 if (line < 0) {
1135 printk(KERN_WARNING "Couldn't register serial port %s: %d\n", pci_name(dev), line);
1136 pci_disable_device(dev);
1137 return line;
1138 }
1139 pci_set_drvdata(dev, &serial_txx9_ports[line]);
1140
1141 return 0;
1142 }
1143
1144 static void __devexit pciserial_txx9_remove_one(struct pci_dev *dev)
1145 {
1146 struct uart_txx9_port *up = pci_get_drvdata(dev);
1147
1148 pci_set_drvdata(dev, NULL);
1149
1150 if (up) {
1151 serial_txx9_unregister_port(up->port.line);
1152 pci_disable_device(dev);
1153 }
1154 }
1155
1156 #ifdef CONFIG_PM
1157 static int pciserial_txx9_suspend_one(struct pci_dev *dev, pm_message_t state)
1158 {
1159 struct uart_txx9_port *up = pci_get_drvdata(dev);
1160
1161 if (up)
1162 uart_suspend_port(&serial_txx9_reg, &up->port);
1163 pci_save_state(dev);
1164 pci_set_power_state(dev, pci_choose_state(dev, state));
1165 return 0;
1166 }
1167
1168 static int pciserial_txx9_resume_one(struct pci_dev *dev)
1169 {
1170 struct uart_txx9_port *up = pci_get_drvdata(dev);
1171
1172 pci_set_power_state(dev, PCI_D0);
1173 pci_restore_state(dev);
1174 if (up)
1175 uart_resume_port(&serial_txx9_reg, &up->port);
1176 return 0;
1177 }
1178 #endif
1179
1180 static const struct pci_device_id serial_txx9_pci_tbl[] = {
1181 { PCI_DEVICE(PCI_VENDOR_ID_TOSHIBA_2, PCI_DEVICE_ID_TOSHIBA_TC86C001_MISC) },
1182 { 0, }
1183 };
1184
1185 static struct pci_driver serial_txx9_pci_driver = {
1186 .name = "serial_txx9",
1187 .probe = pciserial_txx9_init_one,
1188 .remove = __devexit_p(pciserial_txx9_remove_one),
1189 #ifdef CONFIG_PM
1190 .suspend = pciserial_txx9_suspend_one,
1191 .resume = pciserial_txx9_resume_one,
1192 #endif
1193 .id_table = serial_txx9_pci_tbl,
1194 };
1195
1196 MODULE_DEVICE_TABLE(pci, serial_txx9_pci_tbl);
1197 #endif /* ENABLE_SERIAL_TXX9_PCI */
1198
1199 static struct platform_device *serial_txx9_plat_devs;
1200
1201 static int __init serial_txx9_init(void)
1202 {
1203 int ret;
1204
1205 printk(KERN_INFO "%s version %s\n", serial_name, serial_version);
1206
1207 ret = uart_register_driver(&serial_txx9_reg);
1208 if (ret)
1209 goto out;
1210
1211 serial_txx9_plat_devs = platform_device_alloc("serial_txx9", -1);
1212 if (!serial_txx9_plat_devs) {
1213 ret = -ENOMEM;
1214 goto unreg_uart_drv;
1215 }
1216
1217 ret = platform_device_add(serial_txx9_plat_devs);
1218 if (ret)
1219 goto put_dev;
1220
1221 serial_txx9_register_ports(&serial_txx9_reg,
1222 &serial_txx9_plat_devs->dev);
1223
1224 ret = platform_driver_register(&serial_txx9_plat_driver);
1225 if (ret)
1226 goto del_dev;
1227
1228 #ifdef ENABLE_SERIAL_TXX9_PCI
1229 ret = pci_register_driver(&serial_txx9_pci_driver);
1230 #endif
1231 if (ret == 0)
1232 goto out;
1233
1234 del_dev:
1235 platform_device_del(serial_txx9_plat_devs);
1236 put_dev:
1237 platform_device_put(serial_txx9_plat_devs);
1238 unreg_uart_drv:
1239 uart_unregister_driver(&serial_txx9_reg);
1240 out:
1241 return ret;
1242 }
1243
1244 static void __exit serial_txx9_exit(void)
1245 {
1246 int i;
1247
1248 #ifdef ENABLE_SERIAL_TXX9_PCI
1249 pci_unregister_driver(&serial_txx9_pci_driver);
1250 #endif
1251 platform_driver_unregister(&serial_txx9_plat_driver);
1252 platform_device_unregister(serial_txx9_plat_devs);
1253 for (i = 0; i < UART_NR; i++) {
1254 struct uart_txx9_port *up = &serial_txx9_ports[i];
1255 if (up->port.iobase || up->port.mapbase)
1256 uart_remove_one_port(&serial_txx9_reg, &up->port);
1257 }
1258
1259 uart_unregister_driver(&serial_txx9_reg);
1260 }
1261
1262 module_init(serial_txx9_init);
1263 module_exit(serial_txx9_exit);
1264
1265 MODULE_LICENSE("GPL");
1266 MODULE_DESCRIPTION("TX39/49 serial driver");
1267
1268 MODULE_ALIAS_CHARDEV_MAJOR(TXX9_TTY_MAJOR);
Support for the Chinese Samsung S3C2440 based development boards