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IRQ: Maintain regs pointer globally rather than passing to IRQ handlers
[mirror_ubuntu-jammy-kernel.git] / drivers / serial / serial_txx9.c
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 * Revision History:
20 * 0.30 Initial revision. (Renamed from serial_txx927.c)
21 * 0.31 Use save_flags instead of local_irq_save.
22 * 0.32 Support SCLK.
23 * 0.33 Switch TXX9_TTY_NAME by CONFIG_SERIAL_TXX9_STDSERIAL.
24 * Support TIOCSERGETLSR.
25 * 0.34 Support slow baudrate.
26 * 0.40 Merge codes from mainstream kernel (2.4.22).
27 * 0.41 Fix console checking in rs_shutdown_port().
28 * Disable flow-control in serial_console_write().
29 * 0.42 Fix minor compiler warning.
30 * 1.00 Kernel 2.6. Converted to new serial core (based on 8250.c).
31 * 1.01 Set fifosize to make tx_empry called properly.
32 * Use standard uart_get_divisor.
33 * 1.02 Cleanup. (import 8250.c changes)
34 * 1.03 Fix low-latency mode. (import 8250.c changes)
35 * 1.04 Remove usage of deprecated functions, cleanup.
36 * 1.05 More strict check in verify_port. Cleanup.
37 * 1.06 Do not insert a char caused previous overrun.
38 * Fix some spin_locks.
39 * Do not call uart_add_one_port for absent ports.
40 */
41
42 #if defined(CONFIG_SERIAL_TXX9_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
43 #define SUPPORT_SYSRQ
44 #endif
45
46 #include <linux/module.h>
47 #include <linux/ioport.h>
48 #include <linux/init.h>
49 #include <linux/console.h>
50 #include <linux/sysrq.h>
51 #include <linux/delay.h>
52 #include <linux/device.h>
53 #include <linux/pci.h>
54 #include <linux/tty.h>
55 #include <linux/tty_flip.h>
56 #include <linux/serial_core.h>
57 #include <linux/serial.h>
58 #include <linux/mutex.h>
59
60 #include <asm/io.h>
61 #include <asm/irq.h>
62
63 static char *serial_version = "1.06";
64 static char *serial_name = "TX39/49 Serial driver";
65
66 #define PASS_LIMIT 256
67
68 #if !defined(CONFIG_SERIAL_TXX9_STDSERIAL)
69 /* "ttyS" is used for standard serial driver */
70 #define TXX9_TTY_NAME "ttyTX"
71 #define TXX9_TTY_MINOR_START (64 + 64) /* ttyTX0(128), ttyTX1(129) */
72 #else
73 /* acts like standard serial driver */
74 #define TXX9_TTY_NAME "ttyS"
75 #define TXX9_TTY_MINOR_START 64
76 #endif
77 #define TXX9_TTY_MAJOR TTY_MAJOR
78
79 /* flag aliases */
80 #define UPF_TXX9_HAVE_CTS_LINE UPF_BUGGY_UART
81 #define UPF_TXX9_USE_SCLK UPF_MAGIC_MULTIPLIER
82
83 #ifdef CONFIG_PCI
84 /* support for Toshiba TC86C001 SIO */
85 #define ENABLE_SERIAL_TXX9_PCI
86 #endif
87
88 /*
89 * Number of serial ports
90 */
91 #ifdef ENABLE_SERIAL_TXX9_PCI
92 #define NR_PCI_BOARDS 4
93 #define UART_NR (4 + NR_PCI_BOARDS)
94 #else
95 #define UART_NR 4
96 #endif
97
98 #define HIGH_BITS_OFFSET ((sizeof(long)-sizeof(int))*8)
99
100 struct uart_txx9_port {
101 struct uart_port port;
102
103 /*
104 * We provide a per-port pm hook.
105 */
106 void (*pm)(struct uart_port *port,
107 unsigned int state, unsigned int old);
108 };
109
110 #define TXX9_REGION_SIZE 0x24
111
112 /* TXX9 Serial Registers */
113 #define TXX9_SILCR 0x00
114 #define TXX9_SIDICR 0x04
115 #define TXX9_SIDISR 0x08
116 #define TXX9_SICISR 0x0c
117 #define TXX9_SIFCR 0x10
118 #define TXX9_SIFLCR 0x14
119 #define TXX9_SIBGR 0x18
120 #define TXX9_SITFIFO 0x1c
121 #define TXX9_SIRFIFO 0x20
122
123 /* SILCR : Line Control */
124 #define TXX9_SILCR_SCS_MASK 0x00000060
125 #define TXX9_SILCR_SCS_IMCLK 0x00000000
126 #define TXX9_SILCR_SCS_IMCLK_BG 0x00000020
127 #define TXX9_SILCR_SCS_SCLK 0x00000040
128 #define TXX9_SILCR_SCS_SCLK_BG 0x00000060
129 #define TXX9_SILCR_UEPS 0x00000010
130 #define TXX9_SILCR_UPEN 0x00000008
131 #define TXX9_SILCR_USBL_MASK 0x00000004
132 #define TXX9_SILCR_USBL_1BIT 0x00000000
133 #define TXX9_SILCR_USBL_2BIT 0x00000004
134 #define TXX9_SILCR_UMODE_MASK 0x00000003
135 #define TXX9_SILCR_UMODE_8BIT 0x00000000
136 #define TXX9_SILCR_UMODE_7BIT 0x00000001
137
138 /* SIDICR : DMA/Int. Control */
139 #define TXX9_SIDICR_TDE 0x00008000
140 #define TXX9_SIDICR_RDE 0x00004000
141 #define TXX9_SIDICR_TIE 0x00002000
142 #define TXX9_SIDICR_RIE 0x00001000
143 #define TXX9_SIDICR_SPIE 0x00000800
144 #define TXX9_SIDICR_CTSAC 0x00000600
145 #define TXX9_SIDICR_STIE_MASK 0x0000003f
146 #define TXX9_SIDICR_STIE_OERS 0x00000020
147 #define TXX9_SIDICR_STIE_CTSS 0x00000010
148 #define TXX9_SIDICR_STIE_RBRKD 0x00000008
149 #define TXX9_SIDICR_STIE_TRDY 0x00000004
150 #define TXX9_SIDICR_STIE_TXALS 0x00000002
151 #define TXX9_SIDICR_STIE_UBRKD 0x00000001
152
153 /* SIDISR : DMA/Int. Status */
154 #define TXX9_SIDISR_UBRK 0x00008000
155 #define TXX9_SIDISR_UVALID 0x00004000
156 #define TXX9_SIDISR_UFER 0x00002000
157 #define TXX9_SIDISR_UPER 0x00001000
158 #define TXX9_SIDISR_UOER 0x00000800
159 #define TXX9_SIDISR_ERI 0x00000400
160 #define TXX9_SIDISR_TOUT 0x00000200
161 #define TXX9_SIDISR_TDIS 0x00000100
162 #define TXX9_SIDISR_RDIS 0x00000080
163 #define TXX9_SIDISR_STIS 0x00000040
164 #define TXX9_SIDISR_RFDN_MASK 0x0000001f
165
166 /* SICISR : Change Int. Status */
167 #define TXX9_SICISR_OERS 0x00000020
168 #define TXX9_SICISR_CTSS 0x00000010
169 #define TXX9_SICISR_RBRKD 0x00000008
170 #define TXX9_SICISR_TRDY 0x00000004
171 #define TXX9_SICISR_TXALS 0x00000002
172 #define TXX9_SICISR_UBRKD 0x00000001
173
174 /* SIFCR : FIFO Control */
175 #define TXX9_SIFCR_SWRST 0x00008000
176 #define TXX9_SIFCR_RDIL_MASK 0x00000180
177 #define TXX9_SIFCR_RDIL_1 0x00000000
178 #define TXX9_SIFCR_RDIL_4 0x00000080
179 #define TXX9_SIFCR_RDIL_8 0x00000100
180 #define TXX9_SIFCR_RDIL_12 0x00000180
181 #define TXX9_SIFCR_RDIL_MAX 0x00000180
182 #define TXX9_SIFCR_TDIL_MASK 0x00000018
183 #define TXX9_SIFCR_TDIL_MASK 0x00000018
184 #define TXX9_SIFCR_TDIL_1 0x00000000
185 #define TXX9_SIFCR_TDIL_4 0x00000001
186 #define TXX9_SIFCR_TDIL_8 0x00000010
187 #define TXX9_SIFCR_TDIL_MAX 0x00000010
188 #define TXX9_SIFCR_TFRST 0x00000004
189 #define TXX9_SIFCR_RFRST 0x00000002
190 #define TXX9_SIFCR_FRSTE 0x00000001
191 #define TXX9_SIO_TX_FIFO 8
192 #define TXX9_SIO_RX_FIFO 16
193
194 /* SIFLCR : Flow Control */
195 #define TXX9_SIFLCR_RCS 0x00001000
196 #define TXX9_SIFLCR_TES 0x00000800
197 #define TXX9_SIFLCR_RTSSC 0x00000200
198 #define TXX9_SIFLCR_RSDE 0x00000100
199 #define TXX9_SIFLCR_TSDE 0x00000080
200 #define TXX9_SIFLCR_RTSTL_MASK 0x0000001e
201 #define TXX9_SIFLCR_RTSTL_MAX 0x0000001e
202 #define TXX9_SIFLCR_TBRK 0x00000001
203
204 /* SIBGR : Baudrate Control */
205 #define TXX9_SIBGR_BCLK_MASK 0x00000300
206 #define TXX9_SIBGR_BCLK_T0 0x00000000
207 #define TXX9_SIBGR_BCLK_T2 0x00000100
208 #define TXX9_SIBGR_BCLK_T4 0x00000200
209 #define TXX9_SIBGR_BCLK_T6 0x00000300
210 #define TXX9_SIBGR_BRD_MASK 0x000000ff
211
212 static inline unsigned int sio_in(struct uart_txx9_port *up, int offset)
213 {
214 switch (up->port.iotype) {
215 default:
216 return __raw_readl(up->port.membase + offset);
217 case UPIO_PORT:
218 return inl(up->port.iobase + offset);
219 }
220 }
221
222 static inline void
223 sio_out(struct uart_txx9_port *up, int offset, int value)
224 {
225 switch (up->port.iotype) {
226 default:
227 __raw_writel(value, up->port.membase + offset);
228 break;
229 case UPIO_PORT:
230 outl(value, up->port.iobase + offset);
231 break;
232 }
233 }
234
235 static inline void
236 sio_mask(struct uart_txx9_port *up, int offset, unsigned int value)
237 {
238 sio_out(up, offset, sio_in(up, offset) & ~value);
239 }
240 static inline void
241 sio_set(struct uart_txx9_port *up, int offset, unsigned int value)
242 {
243 sio_out(up, offset, sio_in(up, offset) | value);
244 }
245
246 static inline void
247 sio_quot_set(struct uart_txx9_port *up, int quot)
248 {
249 quot >>= 1;
250 if (quot < 256)
251 sio_out(up, TXX9_SIBGR, quot | TXX9_SIBGR_BCLK_T0);
252 else if (quot < (256 << 2))
253 sio_out(up, TXX9_SIBGR, (quot >> 2) | TXX9_SIBGR_BCLK_T2);
254 else if (quot < (256 << 4))
255 sio_out(up, TXX9_SIBGR, (quot >> 4) | TXX9_SIBGR_BCLK_T4);
256 else if (quot < (256 << 6))
257 sio_out(up, TXX9_SIBGR, (quot >> 6) | TXX9_SIBGR_BCLK_T6);
258 else
259 sio_out(up, TXX9_SIBGR, 0xff | TXX9_SIBGR_BCLK_T6);
260 }
261
262 static void serial_txx9_stop_tx(struct uart_port *port)
263 {
264 struct uart_txx9_port *up = (struct uart_txx9_port *)port;
265 sio_mask(up, TXX9_SIDICR, TXX9_SIDICR_TIE);
266 }
267
268 static void serial_txx9_start_tx(struct uart_port *port)
269 {
270 struct uart_txx9_port *up = (struct uart_txx9_port *)port;
271 sio_set(up, TXX9_SIDICR, TXX9_SIDICR_TIE);
272 }
273
274 static void serial_txx9_stop_rx(struct uart_port *port)
275 {
276 struct uart_txx9_port *up = (struct uart_txx9_port *)port;
277 up->port.read_status_mask &= ~TXX9_SIDISR_RDIS;
278 }
279
280 static void serial_txx9_enable_ms(struct uart_port *port)
281 {
282 /* TXX9-SIO can not control DTR... */
283 }
284
285 static inline void
286 receive_chars(struct uart_txx9_port *up, unsigned int *status)
287 {
288 struct tty_struct *tty = up->port.info->tty;
289 unsigned char ch;
290 unsigned int disr = *status;
291 int max_count = 256;
292 char flag;
293 unsigned int next_ignore_status_mask;
294
295 do {
296 ch = sio_in(up, TXX9_SIRFIFO);
297 flag = TTY_NORMAL;
298 up->port.icount.rx++;
299
300 /* mask out RFDN_MASK bit added by previous overrun */
301 next_ignore_status_mask =
302 up->port.ignore_status_mask & ~TXX9_SIDISR_RFDN_MASK;
303 if (unlikely(disr & (TXX9_SIDISR_UBRK | TXX9_SIDISR_UPER |
304 TXX9_SIDISR_UFER | TXX9_SIDISR_UOER))) {
305 /*
306 * For statistics only
307 */
308 if (disr & TXX9_SIDISR_UBRK) {
309 disr &= ~(TXX9_SIDISR_UFER | TXX9_SIDISR_UPER);
310 up->port.icount.brk++;
311 /*
312 * We do the SysRQ and SAK checking
313 * here because otherwise the break
314 * may get masked by ignore_status_mask
315 * or read_status_mask.
316 */
317 if (uart_handle_break(&up->port))
318 goto ignore_char;
319 } else if (disr & TXX9_SIDISR_UPER)
320 up->port.icount.parity++;
321 else if (disr & TXX9_SIDISR_UFER)
322 up->port.icount.frame++;
323 if (disr & TXX9_SIDISR_UOER) {
324 up->port.icount.overrun++;
325 /*
326 * The receiver read buffer still hold
327 * a char which caused overrun.
328 * Ignore next char by adding RFDN_MASK
329 * to ignore_status_mask temporarily.
330 */
331 next_ignore_status_mask |=
332 TXX9_SIDISR_RFDN_MASK;
333 }
334
335 /*
336 * Mask off conditions which should be ingored.
337 */
338 disr &= up->port.read_status_mask;
339
340 if (disr & TXX9_SIDISR_UBRK) {
341 flag = TTY_BREAK;
342 } else if (disr & TXX9_SIDISR_UPER)
343 flag = TTY_PARITY;
344 else if (disr & TXX9_SIDISR_UFER)
345 flag = TTY_FRAME;
346 }
347 if (uart_handle_sysrq_char(&up->port, ch))
348 goto ignore_char;
349
350 uart_insert_char(&up->port, disr, TXX9_SIDISR_UOER, ch, flag);
351
352 ignore_char:
353 up->port.ignore_status_mask = next_ignore_status_mask;
354 disr = sio_in(up, TXX9_SIDISR);
355 } while (!(disr & TXX9_SIDISR_UVALID) && (max_count-- > 0));
356 spin_unlock(&up->port.lock);
357 tty_flip_buffer_push(tty);
358 spin_lock(&up->port.lock);
359 *status = disr;
360 }
361
362 static inline void transmit_chars(struct uart_txx9_port *up)
363 {
364 struct circ_buf *xmit = &up->port.info->xmit;
365 int count;
366
367 if (up->port.x_char) {
368 sio_out(up, TXX9_SITFIFO, up->port.x_char);
369 up->port.icount.tx++;
370 up->port.x_char = 0;
371 return;
372 }
373 if (uart_circ_empty(xmit) || uart_tx_stopped(&up->port)) {
374 serial_txx9_stop_tx(&up->port);
375 return;
376 }
377
378 count = TXX9_SIO_TX_FIFO;
379 do {
380 sio_out(up, TXX9_SITFIFO, xmit->buf[xmit->tail]);
381 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
382 up->port.icount.tx++;
383 if (uart_circ_empty(xmit))
384 break;
385 } while (--count > 0);
386
387 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
388 uart_write_wakeup(&up->port);
389
390 if (uart_circ_empty(xmit))
391 serial_txx9_stop_tx(&up->port);
392 }
393
394 static irqreturn_t serial_txx9_interrupt(int irq, void *dev_id)
395 {
396 int pass_counter = 0;
397 struct uart_txx9_port *up = dev_id;
398 unsigned int status;
399
400 while (1) {
401 spin_lock(&up->port.lock);
402 status = sio_in(up, TXX9_SIDISR);
403 if (!(sio_in(up, TXX9_SIDICR) & TXX9_SIDICR_TIE))
404 status &= ~TXX9_SIDISR_TDIS;
405 if (!(status & (TXX9_SIDISR_TDIS | TXX9_SIDISR_RDIS |
406 TXX9_SIDISR_TOUT))) {
407 spin_unlock(&up->port.lock);
408 break;
409 }
410
411 if (status & TXX9_SIDISR_RDIS)
412 receive_chars(up, &status);
413 if (status & TXX9_SIDISR_TDIS)
414 transmit_chars(up);
415 /* Clear TX/RX Int. Status */
416 sio_mask(up, TXX9_SIDISR,
417 TXX9_SIDISR_TDIS | TXX9_SIDISR_RDIS |
418 TXX9_SIDISR_TOUT);
419 spin_unlock(&up->port.lock);
420
421 if (pass_counter++ > PASS_LIMIT)
422 break;
423 }
424
425 return pass_counter ? IRQ_HANDLED : IRQ_NONE;
426 }
427
428 static unsigned int serial_txx9_tx_empty(struct uart_port *port)
429 {
430 struct uart_txx9_port *up = (struct uart_txx9_port *)port;
431 unsigned long flags;
432 unsigned int ret;
433
434 spin_lock_irqsave(&up->port.lock, flags);
435 ret = (sio_in(up, TXX9_SICISR) & TXX9_SICISR_TXALS) ? TIOCSER_TEMT : 0;
436 spin_unlock_irqrestore(&up->port.lock, flags);
437
438 return ret;
439 }
440
441 static unsigned int serial_txx9_get_mctrl(struct uart_port *port)
442 {
443 struct uart_txx9_port *up = (struct uart_txx9_port *)port;
444 unsigned int ret;
445
446 ret = ((sio_in(up, TXX9_SIFLCR) & TXX9_SIFLCR_RTSSC) ? 0 : TIOCM_RTS)
447 | ((sio_in(up, TXX9_SICISR) & TXX9_SICISR_CTSS) ? 0 : TIOCM_CTS);
448
449 return ret;
450 }
451
452 static void serial_txx9_set_mctrl(struct uart_port *port, unsigned int mctrl)
453 {
454 struct uart_txx9_port *up = (struct uart_txx9_port *)port;
455
456 if (mctrl & TIOCM_RTS)
457 sio_mask(up, TXX9_SIFLCR, TXX9_SIFLCR_RTSSC);
458 else
459 sio_set(up, TXX9_SIFLCR, TXX9_SIFLCR_RTSSC);
460 }
461
462 static void serial_txx9_break_ctl(struct uart_port *port, int break_state)
463 {
464 struct uart_txx9_port *up = (struct uart_txx9_port *)port;
465 unsigned long flags;
466
467 spin_lock_irqsave(&up->port.lock, flags);
468 if (break_state == -1)
469 sio_set(up, TXX9_SIFLCR, TXX9_SIFLCR_TBRK);
470 else
471 sio_mask(up, TXX9_SIFLCR, TXX9_SIFLCR_TBRK);
472 spin_unlock_irqrestore(&up->port.lock, flags);
473 }
474
475 static int serial_txx9_startup(struct uart_port *port)
476 {
477 struct uart_txx9_port *up = (struct uart_txx9_port *)port;
478 unsigned long flags;
479 int retval;
480
481 /*
482 * Clear the FIFO buffers and disable them.
483 * (they will be reenabled in set_termios())
484 */
485 sio_set(up, TXX9_SIFCR,
486 TXX9_SIFCR_TFRST | TXX9_SIFCR_RFRST | TXX9_SIFCR_FRSTE);
487 /* clear reset */
488 sio_mask(up, TXX9_SIFCR,
489 TXX9_SIFCR_TFRST | TXX9_SIFCR_RFRST | TXX9_SIFCR_FRSTE);
490 sio_out(up, TXX9_SIDICR, 0);
491
492 /*
493 * Clear the interrupt registers.
494 */
495 sio_out(up, TXX9_SIDISR, 0);
496
497 retval = request_irq(up->port.irq, serial_txx9_interrupt,
498 IRQF_SHARED, "serial_txx9", up);
499 if (retval)
500 return retval;
501
502 /*
503 * Now, initialize the UART
504 */
505 spin_lock_irqsave(&up->port.lock, flags);
506 serial_txx9_set_mctrl(&up->port, up->port.mctrl);
507 spin_unlock_irqrestore(&up->port.lock, flags);
508
509 /* Enable RX/TX */
510 sio_mask(up, TXX9_SIFLCR, TXX9_SIFLCR_RSDE | TXX9_SIFLCR_TSDE);
511
512 /*
513 * Finally, enable interrupts.
514 */
515 sio_set(up, TXX9_SIDICR, TXX9_SIDICR_RIE);
516
517 return 0;
518 }
519
520 static void serial_txx9_shutdown(struct uart_port *port)
521 {
522 struct uart_txx9_port *up = (struct uart_txx9_port *)port;
523 unsigned long flags;
524
525 /*
526 * Disable interrupts from this port
527 */
528 sio_out(up, TXX9_SIDICR, 0); /* disable all intrs */
529
530 spin_lock_irqsave(&up->port.lock, flags);
531 serial_txx9_set_mctrl(&up->port, up->port.mctrl);
532 spin_unlock_irqrestore(&up->port.lock, flags);
533
534 /*
535 * Disable break condition
536 */
537 sio_mask(up, TXX9_SIFLCR, TXX9_SIFLCR_TBRK);
538
539 #ifdef CONFIG_SERIAL_TXX9_CONSOLE
540 if (up->port.cons && up->port.line == up->port.cons->index) {
541 free_irq(up->port.irq, up);
542 return;
543 }
544 #endif
545 /* reset FIFOs */
546 sio_set(up, TXX9_SIFCR,
547 TXX9_SIFCR_TFRST | TXX9_SIFCR_RFRST | TXX9_SIFCR_FRSTE);
548 /* clear reset */
549 sio_mask(up, TXX9_SIFCR,
550 TXX9_SIFCR_TFRST | TXX9_SIFCR_RFRST | TXX9_SIFCR_FRSTE);
551
552 /* Disable RX/TX */
553 sio_set(up, TXX9_SIFLCR, TXX9_SIFLCR_RSDE | TXX9_SIFLCR_TSDE);
554
555 free_irq(up->port.irq, up);
556 }
557
558 static void
559 serial_txx9_set_termios(struct uart_port *port, struct termios *termios,
560 struct termios *old)
561 {
562 struct uart_txx9_port *up = (struct uart_txx9_port *)port;
563 unsigned int cval, fcr = 0;
564 unsigned long flags;
565 unsigned int baud, quot;
566
567 cval = sio_in(up, TXX9_SILCR);
568 /* byte size and parity */
569 cval &= ~TXX9_SILCR_UMODE_MASK;
570 switch (termios->c_cflag & CSIZE) {
571 case CS7:
572 cval |= TXX9_SILCR_UMODE_7BIT;
573 break;
574 default:
575 case CS5: /* not supported */
576 case CS6: /* not supported */
577 case CS8:
578 cval |= TXX9_SILCR_UMODE_8BIT;
579 break;
580 }
581
582 cval &= ~TXX9_SILCR_USBL_MASK;
583 if (termios->c_cflag & CSTOPB)
584 cval |= TXX9_SILCR_USBL_2BIT;
585 else
586 cval |= TXX9_SILCR_USBL_1BIT;
587 cval &= ~(TXX9_SILCR_UPEN | TXX9_SILCR_UEPS);
588 if (termios->c_cflag & PARENB)
589 cval |= TXX9_SILCR_UPEN;
590 if (!(termios->c_cflag & PARODD))
591 cval |= TXX9_SILCR_UEPS;
592
593 /*
594 * Ask the core to calculate the divisor for us.
595 */
596 baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16/2);
597 quot = uart_get_divisor(port, baud);
598
599 /* Set up FIFOs */
600 /* TX Int by FIFO Empty, RX Int by Receiving 1 char. */
601 fcr = TXX9_SIFCR_TDIL_MAX | TXX9_SIFCR_RDIL_1;
602
603 /*
604 * Ok, we're now changing the port state. Do it with
605 * interrupts disabled.
606 */
607 spin_lock_irqsave(&up->port.lock, flags);
608
609 /*
610 * Update the per-port timeout.
611 */
612 uart_update_timeout(port, termios->c_cflag, baud);
613
614 up->port.read_status_mask = TXX9_SIDISR_UOER |
615 TXX9_SIDISR_TDIS | TXX9_SIDISR_RDIS;
616 if (termios->c_iflag & INPCK)
617 up->port.read_status_mask |= TXX9_SIDISR_UFER | TXX9_SIDISR_UPER;
618 if (termios->c_iflag & (BRKINT | PARMRK))
619 up->port.read_status_mask |= TXX9_SIDISR_UBRK;
620
621 /*
622 * Characteres to ignore
623 */
624 up->port.ignore_status_mask = 0;
625 if (termios->c_iflag & IGNPAR)
626 up->port.ignore_status_mask |= TXX9_SIDISR_UPER | TXX9_SIDISR_UFER;
627 if (termios->c_iflag & IGNBRK) {
628 up->port.ignore_status_mask |= TXX9_SIDISR_UBRK;
629 /*
630 * If we're ignoring parity and break indicators,
631 * ignore overruns too (for real raw support).
632 */
633 if (termios->c_iflag & IGNPAR)
634 up->port.ignore_status_mask |= TXX9_SIDISR_UOER;
635 }
636
637 /*
638 * ignore all characters if CREAD is not set
639 */
640 if ((termios->c_cflag & CREAD) == 0)
641 up->port.ignore_status_mask |= TXX9_SIDISR_RDIS;
642
643 /* CTS flow control flag */
644 if ((termios->c_cflag & CRTSCTS) &&
645 (up->port.flags & UPF_TXX9_HAVE_CTS_LINE)) {
646 sio_set(up, TXX9_SIFLCR,
647 TXX9_SIFLCR_RCS | TXX9_SIFLCR_TES);
648 } else {
649 sio_mask(up, TXX9_SIFLCR,
650 TXX9_SIFLCR_RCS | TXX9_SIFLCR_TES);
651 }
652
653 sio_out(up, TXX9_SILCR, cval);
654 sio_quot_set(up, quot);
655 sio_out(up, TXX9_SIFCR, fcr);
656
657 serial_txx9_set_mctrl(&up->port, up->port.mctrl);
658 spin_unlock_irqrestore(&up->port.lock, flags);
659 }
660
661 static void
662 serial_txx9_pm(struct uart_port *port, unsigned int state,
663 unsigned int oldstate)
664 {
665 struct uart_txx9_port *up = (struct uart_txx9_port *)port;
666 if (up->pm)
667 up->pm(port, state, oldstate);
668 }
669
670 static int serial_txx9_request_resource(struct uart_txx9_port *up)
671 {
672 unsigned int size = TXX9_REGION_SIZE;
673 int ret = 0;
674
675 switch (up->port.iotype) {
676 default:
677 if (!up->port.mapbase)
678 break;
679
680 if (!request_mem_region(up->port.mapbase, size, "serial_txx9")) {
681 ret = -EBUSY;
682 break;
683 }
684
685 if (up->port.flags & UPF_IOREMAP) {
686 up->port.membase = ioremap(up->port.mapbase, size);
687 if (!up->port.membase) {
688 release_mem_region(up->port.mapbase, size);
689 ret = -ENOMEM;
690 }
691 }
692 break;
693
694 case UPIO_PORT:
695 if (!request_region(up->port.iobase, size, "serial_txx9"))
696 ret = -EBUSY;
697 break;
698 }
699 return ret;
700 }
701
702 static void serial_txx9_release_resource(struct uart_txx9_port *up)
703 {
704 unsigned int size = TXX9_REGION_SIZE;
705
706 switch (up->port.iotype) {
707 default:
708 if (!up->port.mapbase)
709 break;
710
711 if (up->port.flags & UPF_IOREMAP) {
712 iounmap(up->port.membase);
713 up->port.membase = NULL;
714 }
715
716 release_mem_region(up->port.mapbase, size);
717 break;
718
719 case UPIO_PORT:
720 release_region(up->port.iobase, size);
721 break;
722 }
723 }
724
725 static void serial_txx9_release_port(struct uart_port *port)
726 {
727 struct uart_txx9_port *up = (struct uart_txx9_port *)port;
728 serial_txx9_release_resource(up);
729 }
730
731 static int serial_txx9_request_port(struct uart_port *port)
732 {
733 struct uart_txx9_port *up = (struct uart_txx9_port *)port;
734 return serial_txx9_request_resource(up);
735 }
736
737 static void serial_txx9_config_port(struct uart_port *port, int uflags)
738 {
739 struct uart_txx9_port *up = (struct uart_txx9_port *)port;
740 unsigned long flags;
741 int ret;
742
743 /*
744 * Find the region that we can probe for. This in turn
745 * tells us whether we can probe for the type of port.
746 */
747 ret = serial_txx9_request_resource(up);
748 if (ret < 0)
749 return;
750 port->type = PORT_TXX9;
751 up->port.fifosize = TXX9_SIO_TX_FIFO;
752
753 #ifdef CONFIG_SERIAL_TXX9_CONSOLE
754 if (up->port.line == up->port.cons->index)
755 return;
756 #endif
757 spin_lock_irqsave(&up->port.lock, flags);
758 /*
759 * Reset the UART.
760 */
761 sio_out(up, TXX9_SIFCR, TXX9_SIFCR_SWRST);
762 #ifdef CONFIG_CPU_TX49XX
763 /* TX4925 BUG WORKAROUND. Accessing SIOC register
764 * immediately after soft reset causes bus error. */
765 iob();
766 udelay(1);
767 #endif
768 while (sio_in(up, TXX9_SIFCR) & TXX9_SIFCR_SWRST)
769 ;
770 /* TX Int by FIFO Empty, RX Int by Receiving 1 char. */
771 sio_set(up, TXX9_SIFCR,
772 TXX9_SIFCR_TDIL_MAX | TXX9_SIFCR_RDIL_1);
773 /* initial settings */
774 sio_out(up, TXX9_SILCR,
775 TXX9_SILCR_UMODE_8BIT | TXX9_SILCR_USBL_1BIT |
776 ((up->port.flags & UPF_TXX9_USE_SCLK) ?
777 TXX9_SILCR_SCS_SCLK_BG : TXX9_SILCR_SCS_IMCLK_BG));
778 sio_quot_set(up, uart_get_divisor(port, 9600));
779 sio_out(up, TXX9_SIFLCR, TXX9_SIFLCR_RTSTL_MAX /* 15 */);
780 spin_unlock_irqrestore(&up->port.lock, flags);
781 }
782
783 static int
784 serial_txx9_verify_port(struct uart_port *port, struct serial_struct *ser)
785 {
786 unsigned long new_port = ser->port;
787 if (HIGH_BITS_OFFSET)
788 new_port += (unsigned long)ser->port_high << HIGH_BITS_OFFSET;
789 if (ser->type != port->type ||
790 ser->irq != port->irq ||
791 ser->io_type != port->iotype ||
792 new_port != port->iobase ||
793 (unsigned long)ser->iomem_base != port->mapbase)
794 return -EINVAL;
795 return 0;
796 }
797
798 static const char *
799 serial_txx9_type(struct uart_port *port)
800 {
801 return "txx9";
802 }
803
804 static struct uart_ops serial_txx9_pops = {
805 .tx_empty = serial_txx9_tx_empty,
806 .set_mctrl = serial_txx9_set_mctrl,
807 .get_mctrl = serial_txx9_get_mctrl,
808 .stop_tx = serial_txx9_stop_tx,
809 .start_tx = serial_txx9_start_tx,
810 .stop_rx = serial_txx9_stop_rx,
811 .enable_ms = serial_txx9_enable_ms,
812 .break_ctl = serial_txx9_break_ctl,
813 .startup = serial_txx9_startup,
814 .shutdown = serial_txx9_shutdown,
815 .set_termios = serial_txx9_set_termios,
816 .pm = serial_txx9_pm,
817 .type = serial_txx9_type,
818 .release_port = serial_txx9_release_port,
819 .request_port = serial_txx9_request_port,
820 .config_port = serial_txx9_config_port,
821 .verify_port = serial_txx9_verify_port,
822 };
823
824 static struct uart_txx9_port serial_txx9_ports[UART_NR];
825
826 static void __init serial_txx9_register_ports(struct uart_driver *drv)
827 {
828 int i;
829
830 for (i = 0; i < UART_NR; i++) {
831 struct uart_txx9_port *up = &serial_txx9_ports[i];
832
833 up->port.line = i;
834 up->port.ops = &serial_txx9_pops;
835 if (up->port.iobase || up->port.mapbase)
836 uart_add_one_port(drv, &up->port);
837 }
838 }
839
840 #ifdef CONFIG_SERIAL_TXX9_CONSOLE
841
842 /*
843 * Wait for transmitter & holding register to empty
844 */
845 static inline void wait_for_xmitr(struct uart_txx9_port *up)
846 {
847 unsigned int tmout = 10000;
848
849 /* Wait up to 10ms for the character(s) to be sent. */
850 while (--tmout &&
851 !(sio_in(up, TXX9_SICISR) & TXX9_SICISR_TXALS))
852 udelay(1);
853
854 /* Wait up to 1s for flow control if necessary */
855 if (up->port.flags & UPF_CONS_FLOW) {
856 tmout = 1000000;
857 while (--tmout &&
858 (sio_in(up, TXX9_SICISR) & TXX9_SICISR_CTSS))
859 udelay(1);
860 }
861 }
862
863 static void serial_txx9_console_putchar(struct uart_port *port, int ch)
864 {
865 struct uart_txx9_port *up = (struct uart_txx9_port *)port;
866
867 wait_for_xmitr(up);
868 sio_out(up, TXX9_SITFIFO, ch);
869 }
870
871 /*
872 * Print a string to the serial port trying not to disturb
873 * any possible real use of the port...
874 *
875 * The console_lock must be held when we get here.
876 */
877 static void
878 serial_txx9_console_write(struct console *co, const char *s, unsigned int count)
879 {
880 struct uart_txx9_port *up = &serial_txx9_ports[co->index];
881 unsigned int ier, flcr;
882
883 /*
884 * First save the UER then disable the interrupts
885 */
886 ier = sio_in(up, TXX9_SIDICR);
887 sio_out(up, TXX9_SIDICR, 0);
888 /*
889 * Disable flow-control if enabled (and unnecessary)
890 */
891 flcr = sio_in(up, TXX9_SIFLCR);
892 if (!(up->port.flags & UPF_CONS_FLOW) && (flcr & TXX9_SIFLCR_TES))
893 sio_out(up, TXX9_SIFLCR, flcr & ~TXX9_SIFLCR_TES);
894
895 uart_console_write(&up->port, s, count, serial_txx9_console_putchar);
896
897 /*
898 * Finally, wait for transmitter to become empty
899 * and restore the IER
900 */
901 wait_for_xmitr(up);
902 sio_out(up, TXX9_SIFLCR, flcr);
903 sio_out(up, TXX9_SIDICR, ier);
904 }
905
906 static int serial_txx9_console_setup(struct console *co, char *options)
907 {
908 struct uart_port *port;
909 struct uart_txx9_port *up;
910 int baud = 9600;
911 int bits = 8;
912 int parity = 'n';
913 int flow = 'n';
914
915 /*
916 * Check whether an invalid uart number has been specified, and
917 * if so, search for the first available port that does have
918 * console support.
919 */
920 if (co->index >= UART_NR)
921 co->index = 0;
922 up = &serial_txx9_ports[co->index];
923 port = &up->port;
924 if (!port->ops)
925 return -ENODEV;
926
927 /*
928 * Disable UART interrupts, set DTR and RTS high
929 * and set speed.
930 */
931 sio_out(up, TXX9_SIDICR, 0);
932 /* initial settings */
933 sio_out(up, TXX9_SILCR,
934 TXX9_SILCR_UMODE_8BIT | TXX9_SILCR_USBL_1BIT |
935 ((port->flags & UPF_TXX9_USE_SCLK) ?
936 TXX9_SILCR_SCS_SCLK_BG : TXX9_SILCR_SCS_IMCLK_BG));
937 sio_out(up, TXX9_SIFLCR, TXX9_SIFLCR_RTSTL_MAX /* 15 */);
938
939 if (options)
940 uart_parse_options(options, &baud, &parity, &bits, &flow);
941
942 return uart_set_options(port, co, baud, parity, bits, flow);
943 }
944
945 static struct uart_driver serial_txx9_reg;
946 static struct console serial_txx9_console = {
947 .name = TXX9_TTY_NAME,
948 .write = serial_txx9_console_write,
949 .device = uart_console_device,
950 .setup = serial_txx9_console_setup,
951 .flags = CON_PRINTBUFFER,
952 .index = -1,
953 .data = &serial_txx9_reg,
954 };
955
956 static int __init serial_txx9_console_init(void)
957 {
958 register_console(&serial_txx9_console);
959 return 0;
960 }
961 console_initcall(serial_txx9_console_init);
962
963 #define SERIAL_TXX9_CONSOLE &serial_txx9_console
964 #else
965 #define SERIAL_TXX9_CONSOLE NULL
966 #endif
967
968 static struct uart_driver serial_txx9_reg = {
969 .owner = THIS_MODULE,
970 .driver_name = "serial_txx9",
971 .dev_name = TXX9_TTY_NAME,
972 .major = TXX9_TTY_MAJOR,
973 .minor = TXX9_TTY_MINOR_START,
974 .nr = UART_NR,
975 .cons = SERIAL_TXX9_CONSOLE,
976 };
977
978 int __init early_serial_txx9_setup(struct uart_port *port)
979 {
980 if (port->line >= ARRAY_SIZE(serial_txx9_ports))
981 return -ENODEV;
982
983 serial_txx9_ports[port->line].port = *port;
984 serial_txx9_ports[port->line].port.ops = &serial_txx9_pops;
985 serial_txx9_ports[port->line].port.flags |= UPF_BOOT_AUTOCONF;
986 return 0;
987 }
988
989 #ifdef ENABLE_SERIAL_TXX9_PCI
990 /**
991 * serial_txx9_suspend_port - suspend one serial port
992 * @line: serial line number
993 *
994 * Suspend one serial port.
995 */
996 static void serial_txx9_suspend_port(int line)
997 {
998 uart_suspend_port(&serial_txx9_reg, &serial_txx9_ports[line].port);
999 }
1000
1001 /**
1002 * serial_txx9_resume_port - resume one serial port
1003 * @line: serial line number
1004 *
1005 * Resume one serial port.
1006 */
1007 static void serial_txx9_resume_port(int line)
1008 {
1009 uart_resume_port(&serial_txx9_reg, &serial_txx9_ports[line].port);
1010 }
1011
1012 static DEFINE_MUTEX(serial_txx9_mutex);
1013
1014 /**
1015 * serial_txx9_register_port - register a serial port
1016 * @port: serial port template
1017 *
1018 * Configure the serial port specified by the request.
1019 *
1020 * The port is then probed and if necessary the IRQ is autodetected
1021 * If this fails an error is returned.
1022 *
1023 * On success the port is ready to use and the line number is returned.
1024 */
1025 static int __devinit serial_txx9_register_port(struct uart_port *port)
1026 {
1027 int i;
1028 struct uart_txx9_port *uart;
1029 int ret = -ENOSPC;
1030
1031 mutex_lock(&serial_txx9_mutex);
1032 for (i = 0; i < UART_NR; i++) {
1033 uart = &serial_txx9_ports[i];
1034 if (!(uart->port.iobase || uart->port.mapbase))
1035 break;
1036 }
1037 if (i < UART_NR) {
1038 uart->port.iobase = port->iobase;
1039 uart->port.membase = port->membase;
1040 uart->port.irq = port->irq;
1041 uart->port.uartclk = port->uartclk;
1042 uart->port.iotype = port->iotype;
1043 uart->port.flags = port->flags | UPF_BOOT_AUTOCONF;
1044 uart->port.mapbase = port->mapbase;
1045 if (port->dev)
1046 uart->port.dev = port->dev;
1047 ret = uart_add_one_port(&serial_txx9_reg, &uart->port);
1048 if (ret == 0)
1049 ret = uart->port.line;
1050 }
1051 mutex_unlock(&serial_txx9_mutex);
1052 return ret;
1053 }
1054
1055 /**
1056 * serial_txx9_unregister_port - remove a txx9 serial port at runtime
1057 * @line: serial line number
1058 *
1059 * Remove one serial port. This may not be called from interrupt
1060 * context. We hand the port back to the our control.
1061 */
1062 static void __devexit serial_txx9_unregister_port(int line)
1063 {
1064 struct uart_txx9_port *uart = &serial_txx9_ports[line];
1065
1066 mutex_lock(&serial_txx9_mutex);
1067 uart_remove_one_port(&serial_txx9_reg, &uart->port);
1068 uart->port.flags = 0;
1069 uart->port.type = PORT_UNKNOWN;
1070 uart->port.iobase = 0;
1071 uart->port.mapbase = 0;
1072 uart->port.membase = NULL;
1073 uart->port.dev = NULL;
1074 mutex_unlock(&serial_txx9_mutex);
1075 }
1076
1077 /*
1078 * Probe one serial board. Unfortunately, there is no rhyme nor reason
1079 * to the arrangement of serial ports on a PCI card.
1080 */
1081 static int __devinit
1082 pciserial_txx9_init_one(struct pci_dev *dev, const struct pci_device_id *ent)
1083 {
1084 struct uart_port port;
1085 int line;
1086 int rc;
1087
1088 rc = pci_enable_device(dev);
1089 if (rc)
1090 return rc;
1091
1092 memset(&port, 0, sizeof(port));
1093 port.ops = &serial_txx9_pops;
1094 port.flags |= UPF_TXX9_HAVE_CTS_LINE;
1095 port.uartclk = 66670000;
1096 port.irq = dev->irq;
1097 port.iotype = UPIO_PORT;
1098 port.iobase = pci_resource_start(dev, 1);
1099 port.dev = &dev->dev;
1100 line = serial_txx9_register_port(&port);
1101 if (line < 0) {
1102 printk(KERN_WARNING "Couldn't register serial port %s: %d\n", pci_name(dev), line);
1103 }
1104 pci_set_drvdata(dev, (void *)(long)line);
1105
1106 return 0;
1107 }
1108
1109 static void __devexit pciserial_txx9_remove_one(struct pci_dev *dev)
1110 {
1111 int line = (int)(long)pci_get_drvdata(dev);
1112
1113 pci_set_drvdata(dev, NULL);
1114
1115 if (line) {
1116 serial_txx9_unregister_port(line);
1117 pci_disable_device(dev);
1118 }
1119 }
1120
1121 static int pciserial_txx9_suspend_one(struct pci_dev *dev, pm_message_t state)
1122 {
1123 int line = (int)(long)pci_get_drvdata(dev);
1124
1125 if (line)
1126 serial_txx9_suspend_port(line);
1127 pci_save_state(dev);
1128 pci_set_power_state(dev, pci_choose_state(dev, state));
1129 return 0;
1130 }
1131
1132 static int pciserial_txx9_resume_one(struct pci_dev *dev)
1133 {
1134 int line = (int)(long)pci_get_drvdata(dev);
1135
1136 pci_set_power_state(dev, PCI_D0);
1137 pci_restore_state(dev);
1138
1139 if (line) {
1140 pci_enable_device(dev);
1141 serial_txx9_resume_port(line);
1142 }
1143 return 0;
1144 }
1145
1146 static struct pci_device_id serial_txx9_pci_tbl[] = {
1147 { PCI_VENDOR_ID_TOSHIBA_2, PCI_DEVICE_ID_TOSHIBA_TC86C001_MISC,
1148 PCI_ANY_ID, PCI_ANY_ID,
1149 0, 0, 0 },
1150 { 0, }
1151 };
1152
1153 static struct pci_driver serial_txx9_pci_driver = {
1154 .name = "serial_txx9",
1155 .probe = pciserial_txx9_init_one,
1156 .remove = __devexit_p(pciserial_txx9_remove_one),
1157 .suspend = pciserial_txx9_suspend_one,
1158 .resume = pciserial_txx9_resume_one,
1159 .id_table = serial_txx9_pci_tbl,
1160 };
1161
1162 MODULE_DEVICE_TABLE(pci, serial_txx9_pci_tbl);
1163 #endif /* ENABLE_SERIAL_TXX9_PCI */
1164
1165 static int __init serial_txx9_init(void)
1166 {
1167 int ret;
1168
1169 printk(KERN_INFO "%s version %s\n", serial_name, serial_version);
1170
1171 ret = uart_register_driver(&serial_txx9_reg);
1172 if (ret >= 0) {
1173 serial_txx9_register_ports(&serial_txx9_reg);
1174
1175 #ifdef ENABLE_SERIAL_TXX9_PCI
1176 ret = pci_register_driver(&serial_txx9_pci_driver);
1177 #endif
1178 }
1179 return ret;
1180 }
1181
1182 static void __exit serial_txx9_exit(void)
1183 {
1184 int i;
1185
1186 #ifdef ENABLE_SERIAL_TXX9_PCI
1187 pci_unregister_driver(&serial_txx9_pci_driver);
1188 #endif
1189 for (i = 0; i < UART_NR; i++) {
1190 struct uart_txx9_port *up = &serial_txx9_ports[i];
1191 if (up->port.iobase || up->port.mapbase)
1192 uart_remove_one_port(&serial_txx9_reg, &up->port);
1193 }
1194
1195 uart_unregister_driver(&serial_txx9_reg);
1196 }
1197
1198 module_init(serial_txx9_init);
1199 module_exit(serial_txx9_exit);
1200
1201 MODULE_LICENSE("GPL");
1202 MODULE_DESCRIPTION("TX39/49 serial driver");
1203
1204 MODULE_ALIAS_CHARDEV_MAJOR(TXX9_TTY_MAJOR);
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