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Merge tag 'trace-printf-v6.13' of git://git.kernel.org/pub/scm/linux/kernel/git/trace...
[drm/drm-misc.git] / drivers / tty / serial / serial_txx9.c
blob436a559234dfe7539da2b4793578af642ce08f82
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Derived from many drivers using generic_serial interface,
4 * especially serial_tx3912.c by Steven J. Hill and r39xx_serial.c
5 * (was in Linux/VR tree) by Jim Pick.
6 *
7 * Copyright (C) 1999 Harald Koerfgen
8 * Copyright (C) 2000 Jim Pick <jim@jimpick.com>
9 * Copyright (C) 2001 Steven J. Hill (sjhill@realitydiluted.com)
10 * Copyright (C) 2000-2002 Toshiba Corporation
11 *
12 * Serial driver for TX3927/TX4927/TX4925/TX4938 internal SIO controller
13 */
14
15 #include <linux/module.h>
16 #include <linux/ioport.h>
17 #include <linux/init.h>
18 #include <linux/console.h>
19 #include <linux/delay.h>
20 #include <linux/platform_device.h>
21 #include <linux/pci.h>
22 #include <linux/serial_core.h>
23 #include <linux/serial.h>
24 #include <linux/tty.h>
25 #include <linux/tty_flip.h>
26 #include <linux/io.h>
27
28 #include <asm/txx9/generic.h>
29
30 #define PASS_LIMIT 256
31
32 #if !defined(CONFIG_SERIAL_TXX9_STDSERIAL)
33 /* "ttyS" is used for standard serial driver */
34 #define TXX9_TTY_NAME "ttyTX"
35 #define TXX9_TTY_MINOR_START 196
36 #define TXX9_TTY_MAJOR 204
37 #else
38 /* acts like standard serial driver */
39 #define TXX9_TTY_NAME "ttyS"
40 #define TXX9_TTY_MINOR_START 64
41 #define TXX9_TTY_MAJOR TTY_MAJOR
42 #endif
43
44 /* flag aliases */
45 #define UPF_TXX9_HAVE_CTS_LINE UPF_BUGGY_UART
46 #define UPF_TXX9_USE_SCLK UPF_MAGIC_MULTIPLIER
47
48 #ifdef CONFIG_PCI
49 /* support for Toshiba TC86C001 SIO */
50 #define ENABLE_SERIAL_TXX9_PCI
51 #endif
52
53 /*
54 * Number of serial ports
55 */
56 #define UART_NR CONFIG_SERIAL_TXX9_NR_UARTS
57
58 #define TXX9_REGION_SIZE 0x24
59
60 /* TXX9 Serial Registers */
61 #define TXX9_SILCR 0x00
62 #define TXX9_SIDICR 0x04
63 #define TXX9_SIDISR 0x08
64 #define TXX9_SICISR 0x0c
65 #define TXX9_SIFCR 0x10
66 #define TXX9_SIFLCR 0x14
67 #define TXX9_SIBGR 0x18
68 #define TXX9_SITFIFO 0x1c
69 #define TXX9_SIRFIFO 0x20
70
71 /* SILCR : Line Control */
72 #define TXX9_SILCR_SCS_MASK 0x00000060
73 #define TXX9_SILCR_SCS_IMCLK 0x00000000
74 #define TXX9_SILCR_SCS_IMCLK_BG 0x00000020
75 #define TXX9_SILCR_SCS_SCLK 0x00000040
76 #define TXX9_SILCR_SCS_SCLK_BG 0x00000060
77 #define TXX9_SILCR_UEPS 0x00000010
78 #define TXX9_SILCR_UPEN 0x00000008
79 #define TXX9_SILCR_USBL_MASK 0x00000004
80 #define TXX9_SILCR_USBL_1BIT 0x00000000
81 #define TXX9_SILCR_USBL_2BIT 0x00000004
82 #define TXX9_SILCR_UMODE_MASK 0x00000003
83 #define TXX9_SILCR_UMODE_8BIT 0x00000000
84 #define TXX9_SILCR_UMODE_7BIT 0x00000001
85
86 /* SIDICR : DMA/Int. Control */
87 #define TXX9_SIDICR_TDE 0x00008000
88 #define TXX9_SIDICR_RDE 0x00004000
89 #define TXX9_SIDICR_TIE 0x00002000
90 #define TXX9_SIDICR_RIE 0x00001000
91 #define TXX9_SIDICR_SPIE 0x00000800
92 #define TXX9_SIDICR_CTSAC 0x00000600
93 #define TXX9_SIDICR_STIE_MASK 0x0000003f
94 #define TXX9_SIDICR_STIE_OERS 0x00000020
95 #define TXX9_SIDICR_STIE_CTSS 0x00000010
96 #define TXX9_SIDICR_STIE_RBRKD 0x00000008
97 #define TXX9_SIDICR_STIE_TRDY 0x00000004
98 #define TXX9_SIDICR_STIE_TXALS 0x00000002
99 #define TXX9_SIDICR_STIE_UBRKD 0x00000001
100
101 /* SIDISR : DMA/Int. Status */
102 #define TXX9_SIDISR_UBRK 0x00008000
103 #define TXX9_SIDISR_UVALID 0x00004000
104 #define TXX9_SIDISR_UFER 0x00002000
105 #define TXX9_SIDISR_UPER 0x00001000
106 #define TXX9_SIDISR_UOER 0x00000800
107 #define TXX9_SIDISR_ERI 0x00000400
108 #define TXX9_SIDISR_TOUT 0x00000200
109 #define TXX9_SIDISR_TDIS 0x00000100
110 #define TXX9_SIDISR_RDIS 0x00000080
111 #define TXX9_SIDISR_STIS 0x00000040
112 #define TXX9_SIDISR_RFDN_MASK 0x0000001f
113
114 /* SICISR : Change Int. Status */
115 #define TXX9_SICISR_OERS 0x00000020
116 #define TXX9_SICISR_CTSS 0x00000010
117 #define TXX9_SICISR_RBRKD 0x00000008
118 #define TXX9_SICISR_TRDY 0x00000004
119 #define TXX9_SICISR_TXALS 0x00000002
120 #define TXX9_SICISR_UBRKD 0x00000001
121
122 /* SIFCR : FIFO Control */
123 #define TXX9_SIFCR_SWRST 0x00008000
124 #define TXX9_SIFCR_RDIL_MASK 0x00000180
125 #define TXX9_SIFCR_RDIL_1 0x00000000
126 #define TXX9_SIFCR_RDIL_4 0x00000080
127 #define TXX9_SIFCR_RDIL_8 0x00000100
128 #define TXX9_SIFCR_RDIL_12 0x00000180
129 #define TXX9_SIFCR_RDIL_MAX 0x00000180
130 #define TXX9_SIFCR_TDIL_MASK 0x00000018
131 #define TXX9_SIFCR_TDIL_1 0x00000000
132 #define TXX9_SIFCR_TDIL_4 0x00000001
133 #define TXX9_SIFCR_TDIL_8 0x00000010
134 #define TXX9_SIFCR_TDIL_MAX 0x00000010
135 #define TXX9_SIFCR_TFRST 0x00000004
136 #define TXX9_SIFCR_RFRST 0x00000002
137 #define TXX9_SIFCR_FRSTE 0x00000001
138 #define TXX9_SIO_TX_FIFO 8
139 #define TXX9_SIO_RX_FIFO 16
140
141 /* SIFLCR : Flow Control */
142 #define TXX9_SIFLCR_RCS 0x00001000
143 #define TXX9_SIFLCR_TES 0x00000800
144 #define TXX9_SIFLCR_RTSSC 0x00000200
145 #define TXX9_SIFLCR_RSDE 0x00000100
146 #define TXX9_SIFLCR_TSDE 0x00000080
147 #define TXX9_SIFLCR_RTSTL_MASK 0x0000001e
148 #define TXX9_SIFLCR_RTSTL_MAX 0x0000001e
149 #define TXX9_SIFLCR_TBRK 0x00000001
150
151 /* SIBGR : Baudrate Control */
152 #define TXX9_SIBGR_BCLK_MASK 0x00000300
153 #define TXX9_SIBGR_BCLK_T0 0x00000000
154 #define TXX9_SIBGR_BCLK_T2 0x00000100
155 #define TXX9_SIBGR_BCLK_T4 0x00000200
156 #define TXX9_SIBGR_BCLK_T6 0x00000300
157 #define TXX9_SIBGR_BRD_MASK 0x000000ff
158
159 static inline unsigned int sio_in(struct uart_port *up, int offset)
160 {
161 switch (up->iotype) {
162 default:
163 return __raw_readl(up->membase + offset);
164 case UPIO_PORT:
165 return inl(up->iobase + offset);
166 }
167 }
168
169 static inline void
170 sio_out(struct uart_port *up, int offset, int value)
171 {
172 switch (up->iotype) {
173 default:
174 __raw_writel(value, up->membase + offset);
175 break;
176 case UPIO_PORT:
177 outl(value, up->iobase + offset);
178 break;
179 }
180 }
181
182 static inline void
183 sio_mask(struct uart_port *up, int offset, unsigned int value)
184 {
185 sio_out(up, offset, sio_in(up, offset) & ~value);
186 }
187 static inline void
188 sio_set(struct uart_port *up, int offset, unsigned int value)
189 {
190 sio_out(up, offset, sio_in(up, offset) | value);
191 }
192
193 static inline void
194 sio_quot_set(struct uart_port *up, int quot)
195 {
196 quot >>= 1;
197 if (quot < 256)
198 sio_out(up, TXX9_SIBGR, quot | TXX9_SIBGR_BCLK_T0);
199 else if (quot < (256 << 2))
200 sio_out(up, TXX9_SIBGR, (quot >> 2) | TXX9_SIBGR_BCLK_T2);
201 else if (quot < (256 << 4))
202 sio_out(up, TXX9_SIBGR, (quot >> 4) | TXX9_SIBGR_BCLK_T4);
203 else if (quot < (256 << 6))
204 sio_out(up, TXX9_SIBGR, (quot >> 6) | TXX9_SIBGR_BCLK_T6);
205 else
206 sio_out(up, TXX9_SIBGR, 0xff | TXX9_SIBGR_BCLK_T6);
207 }
208
209 static void serial_txx9_stop_tx(struct uart_port *up)
210 {
211 sio_mask(up, TXX9_SIDICR, TXX9_SIDICR_TIE);
212 }
213
214 static void serial_txx9_start_tx(struct uart_port *up)
215 {
216 sio_set(up, TXX9_SIDICR, TXX9_SIDICR_TIE);
217 }
218
219 static void serial_txx9_stop_rx(struct uart_port *up)
220 {
221 up->read_status_mask &= ~TXX9_SIDISR_RDIS;
222 }
223
224 static void serial_txx9_initialize(struct uart_port *up)
225 {
226 unsigned int tmout = 10000;
227
228 sio_out(up, TXX9_SIFCR, TXX9_SIFCR_SWRST);
229 /* TX4925 BUG WORKAROUND. Accessing SIOC register
230 * immediately after soft reset causes bus error. */
231 udelay(1);
232 while ((sio_in(up, TXX9_SIFCR) & TXX9_SIFCR_SWRST) && --tmout)
233 udelay(1);
234 /* TX Int by FIFO Empty, RX Int by Receiving 1 char. */
235 sio_set(up, TXX9_SIFCR,
236 TXX9_SIFCR_TDIL_MAX | TXX9_SIFCR_RDIL_1);
237 /* initial settings */
238 sio_out(up, TXX9_SILCR,
239 TXX9_SILCR_UMODE_8BIT | TXX9_SILCR_USBL_1BIT |
240 ((up->flags & UPF_TXX9_USE_SCLK) ?
241 TXX9_SILCR_SCS_SCLK_BG : TXX9_SILCR_SCS_IMCLK_BG));
242 sio_quot_set(up, uart_get_divisor(up, 9600));
243 sio_out(up, TXX9_SIFLCR, TXX9_SIFLCR_RTSTL_MAX /* 15 */);
244 sio_out(up, TXX9_SIDICR, 0);
245 }
246
247 static inline void
248 receive_chars(struct uart_port *up, unsigned int *status)
249 {
250 unsigned int disr = *status;
251 int max_count = 256;
252 unsigned int next_ignore_status_mask;
253 u8 ch, flag;
254
255 do {
256 ch = sio_in(up, TXX9_SIRFIFO);
257 flag = TTY_NORMAL;
258 up->icount.rx++;
259
260 /* mask out RFDN_MASK bit added by previous overrun */
261 next_ignore_status_mask =
262 up->ignore_status_mask & ~TXX9_SIDISR_RFDN_MASK;
263 if (unlikely(disr & (TXX9_SIDISR_UBRK | TXX9_SIDISR_UPER |
264 TXX9_SIDISR_UFER | TXX9_SIDISR_UOER))) {
265 /*
266 * For statistics only
267 */
268 if (disr & TXX9_SIDISR_UBRK) {
269 disr &= ~(TXX9_SIDISR_UFER | TXX9_SIDISR_UPER);
270 up->icount.brk++;
271 /*
272 * We do the SysRQ and SAK checking
273 * here because otherwise the break
274 * may get masked by ignore_status_mask
275 * or read_status_mask.
276 */
277 if (uart_handle_break(up))
278 goto ignore_char;
279 } else if (disr & TXX9_SIDISR_UPER)
280 up->icount.parity++;
281 else if (disr & TXX9_SIDISR_UFER)
282 up->icount.frame++;
283 if (disr & TXX9_SIDISR_UOER) {
284 up->icount.overrun++;
285 /*
286 * The receiver read buffer still hold
287 * a char which caused overrun.
288 * Ignore next char by adding RFDN_MASK
289 * to ignore_status_mask temporarily.
290 */
291 next_ignore_status_mask |=
292 TXX9_SIDISR_RFDN_MASK;
293 }
294
295 /*
296 * Mask off conditions which should be ingored.
297 */
298 disr &= up->read_status_mask;
299
300 if (disr & TXX9_SIDISR_UBRK) {
301 flag = TTY_BREAK;
302 } else if (disr & TXX9_SIDISR_UPER)
303 flag = TTY_PARITY;
304 else if (disr & TXX9_SIDISR_UFER)
305 flag = TTY_FRAME;
306 }
307 if (uart_handle_sysrq_char(up, ch))
308 goto ignore_char;
309
310 uart_insert_char(up, disr, TXX9_SIDISR_UOER, ch, flag);
311
312 ignore_char:
313 up->ignore_status_mask = next_ignore_status_mask;
314 disr = sio_in(up, TXX9_SIDISR);
315 } while (!(disr & TXX9_SIDISR_UVALID) && (max_count-- > 0));
316
317 tty_flip_buffer_push(&up->state->port);
318
319 *status = disr;
320 }
321
322 static inline void transmit_chars(struct uart_port *up)
323 {
324 u8 ch;
325
326 uart_port_tx_limited(up, ch, TXX9_SIO_TX_FIFO,
327 true,
328 sio_out(up, TXX9_SITFIFO, ch),
329 ({}));
330 }
331
332 static irqreturn_t serial_txx9_interrupt(int irq, void *dev_id)
333 {
334 int pass_counter = 0;
335 struct uart_port *up = dev_id;
336 unsigned int status;
337
338 while (1) {
339 uart_port_lock(up);
340 status = sio_in(up, TXX9_SIDISR);
341 if (!(sio_in(up, TXX9_SIDICR) & TXX9_SIDICR_TIE))
342 status &= ~TXX9_SIDISR_TDIS;
343 if (!(status & (TXX9_SIDISR_TDIS | TXX9_SIDISR_RDIS |
344 TXX9_SIDISR_TOUT))) {
345 uart_port_unlock(up);
346 break;
347 }
348
349 if (status & TXX9_SIDISR_RDIS)
350 receive_chars(up, &status);
351 if (status & TXX9_SIDISR_TDIS)
352 transmit_chars(up);
353 /* Clear TX/RX Int. Status */
354 sio_mask(up, TXX9_SIDISR,
355 TXX9_SIDISR_TDIS | TXX9_SIDISR_RDIS |
356 TXX9_SIDISR_TOUT);
357 uart_port_unlock(up);
358
359 if (pass_counter++ > PASS_LIMIT)
360 break;
361 }
362
363 return pass_counter ? IRQ_HANDLED : IRQ_NONE;
364 }
365
366 static unsigned int serial_txx9_tx_empty(struct uart_port *up)
367 {
368 unsigned long flags;
369 unsigned int ret;
370
371 uart_port_lock_irqsave(up, &flags);
372 ret = (sio_in(up, TXX9_SICISR) & TXX9_SICISR_TXALS) ? TIOCSER_TEMT : 0;
373 uart_port_unlock_irqrestore(up, flags);
374
375 return ret;
376 }
377
378 static unsigned int serial_txx9_get_mctrl(struct uart_port *up)
379 {
380 unsigned int ret;
381
382 /* no modem control lines */
383 ret = TIOCM_CAR | TIOCM_DSR;
384 ret |= (sio_in(up, TXX9_SIFLCR) & TXX9_SIFLCR_RTSSC) ? 0 : TIOCM_RTS;
385 ret |= (sio_in(up, TXX9_SICISR) & TXX9_SICISR_CTSS) ? 0 : TIOCM_CTS;
386
387 return ret;
388 }
389
390 static void serial_txx9_set_mctrl(struct uart_port *up, unsigned int mctrl)
391 {
392
393 if (mctrl & TIOCM_RTS)
394 sio_mask(up, TXX9_SIFLCR, TXX9_SIFLCR_RTSSC);
395 else
396 sio_set(up, TXX9_SIFLCR, TXX9_SIFLCR_RTSSC);
397 }
398
399 static void serial_txx9_break_ctl(struct uart_port *up, int break_state)
400 {
401 unsigned long flags;
402
403 uart_port_lock_irqsave(up, &flags);
404 if (break_state == -1)
405 sio_set(up, TXX9_SIFLCR, TXX9_SIFLCR_TBRK);
406 else
407 sio_mask(up, TXX9_SIFLCR, TXX9_SIFLCR_TBRK);
408 uart_port_unlock_irqrestore(up, flags);
409 }
410
411 #if defined(CONFIG_SERIAL_TXX9_CONSOLE) || defined(CONFIG_CONSOLE_POLL)
412 /*
413 * Wait for transmitter & holding register to empty
414 */
415 static void wait_for_xmitr(struct uart_port *up)
416 {
417 unsigned int tmout = 10000;
418
419 /* Wait up to 10ms for the character(s) to be sent. */
420 while (--tmout &&
421 !(sio_in(up, TXX9_SICISR) & TXX9_SICISR_TXALS))
422 udelay(1);
423
424 /* Wait up to 1s for flow control if necessary */
425 if (up->flags & UPF_CONS_FLOW) {
426 tmout = 1000000;
427 while (--tmout &&
428 (sio_in(up, TXX9_SICISR) & TXX9_SICISR_CTSS))
429 udelay(1);
430 }
431 }
432 #endif
433
434 #ifdef CONFIG_CONSOLE_POLL
435 /*
436 * Console polling routines for writing and reading from the uart while
437 * in an interrupt or debug context.
438 */
439
440 static int serial_txx9_get_poll_char(struct uart_port *up)
441 {
442 unsigned int ier;
443 unsigned char c;
444
445 /*
446 * First save the IER then disable the interrupts
447 */
448 ier = sio_in(up, TXX9_SIDICR);
449 sio_out(up, TXX9_SIDICR, 0);
450
451 while (sio_in(up, TXX9_SIDISR) & TXX9_SIDISR_UVALID)
452 ;
453
454 c = sio_in(up, TXX9_SIRFIFO);
455
456 /*
457 * Finally, clear RX interrupt status
458 * and restore the IER
459 */
460 sio_mask(up, TXX9_SIDISR, TXX9_SIDISR_RDIS);
461 sio_out(up, TXX9_SIDICR, ier);
462 return c;
463 }
464
465
466 static void serial_txx9_put_poll_char(struct uart_port *up, unsigned char c)
467 {
468 unsigned int ier;
469
470 /*
471 * First save the IER then disable the interrupts
472 */
473 ier = sio_in(up, TXX9_SIDICR);
474 sio_out(up, TXX9_SIDICR, 0);
475
476 wait_for_xmitr(up);
477 /*
478 * Send the character out.
479 */
480 sio_out(up, TXX9_SITFIFO, c);
481
482 /*
483 * Finally, wait for transmitter to become empty
484 * and restore the IER
485 */
486 wait_for_xmitr(up);
487 sio_out(up, TXX9_SIDICR, ier);
488 }
489
490 #endif /* CONFIG_CONSOLE_POLL */
491
492 static int serial_txx9_startup(struct uart_port *up)
493 {
494 unsigned long flags;
495 int retval;
496
497 /*
498 * Clear the FIFO buffers and disable them.
499 * (they will be reenabled in set_termios())
500 */
501 sio_set(up, TXX9_SIFCR,
502 TXX9_SIFCR_TFRST | TXX9_SIFCR_RFRST | TXX9_SIFCR_FRSTE);
503 /* clear reset */
504 sio_mask(up, TXX9_SIFCR,
505 TXX9_SIFCR_TFRST | TXX9_SIFCR_RFRST | TXX9_SIFCR_FRSTE);
506 sio_out(up, TXX9_SIDICR, 0);
507
508 /*
509 * Clear the interrupt registers.
510 */
511 sio_out(up, TXX9_SIDISR, 0);
512
513 retval = request_irq(up->irq, serial_txx9_interrupt,
514 IRQF_SHARED, "serial_txx9", up);
515 if (retval)
516 return retval;
517
518 /*
519 * Now, initialize the UART
520 */
521 uart_port_lock_irqsave(up, &flags);
522 serial_txx9_set_mctrl(up, up->mctrl);
523 uart_port_unlock_irqrestore(up, flags);
524
525 /* Enable RX/TX */
526 sio_mask(up, TXX9_SIFLCR, TXX9_SIFLCR_RSDE | TXX9_SIFLCR_TSDE);
527
528 /*
529 * Finally, enable interrupts.
530 */
531 sio_set(up, TXX9_SIDICR, TXX9_SIDICR_RIE);
532
533 return 0;
534 }
535
536 static void serial_txx9_shutdown(struct uart_port *up)
537 {
538 unsigned long flags;
539
540 /*
541 * Disable interrupts from this port
542 */
543 sio_out(up, TXX9_SIDICR, 0); /* disable all intrs */
544
545 uart_port_lock_irqsave(up, &flags);
546 serial_txx9_set_mctrl(up, up->mctrl);
547 uart_port_unlock_irqrestore(up, flags);
548
549 /*
550 * Disable break condition
551 */
552 sio_mask(up, TXX9_SIFLCR, TXX9_SIFLCR_TBRK);
553
554 #ifdef CONFIG_SERIAL_TXX9_CONSOLE
555 if (up->cons && up->line == up->cons->index) {
556 free_irq(up->irq, up);
557 return;
558 }
559 #endif
560 /* reset FIFOs */
561 sio_set(up, TXX9_SIFCR,
562 TXX9_SIFCR_TFRST | TXX9_SIFCR_RFRST | TXX9_SIFCR_FRSTE);
563 /* clear reset */
564 sio_mask(up, TXX9_SIFCR,
565 TXX9_SIFCR_TFRST | TXX9_SIFCR_RFRST | TXX9_SIFCR_FRSTE);
566
567 /* Disable RX/TX */
568 sio_set(up, TXX9_SIFLCR, TXX9_SIFLCR_RSDE | TXX9_SIFLCR_TSDE);
569
570 free_irq(up->irq, up);
571 }
572
573 static void
574 serial_txx9_set_termios(struct uart_port *up, struct ktermios *termios,
575 const struct ktermios *old)
576 {
577 unsigned int cval, fcr = 0;
578 unsigned long flags;
579 unsigned int baud, quot;
580
581 /*
582 * We don't support modem control lines.
583 */
584 termios->c_cflag &= ~(HUPCL | CMSPAR);
585 termios->c_cflag |= CLOCAL;
586
587 cval = sio_in(up, TXX9_SILCR);
588 /* byte size and parity */
589 cval &= ~TXX9_SILCR_UMODE_MASK;
590 switch (termios->c_cflag & CSIZE) {
591 case CS7:
592 cval |= TXX9_SILCR_UMODE_7BIT;
593 break;
594 default:
595 case CS5: /* not supported */
596 case CS6: /* not supported */
597 case CS8:
598 cval |= TXX9_SILCR_UMODE_8BIT;
599 termios->c_cflag &= ~CSIZE;
600 termios->c_cflag |= CS8;
601 break;
602 }
603
604 cval &= ~TXX9_SILCR_USBL_MASK;
605 if (termios->c_cflag & CSTOPB)
606 cval |= TXX9_SILCR_USBL_2BIT;
607 else
608 cval |= TXX9_SILCR_USBL_1BIT;
609 cval &= ~(TXX9_SILCR_UPEN | TXX9_SILCR_UEPS);
610 if (termios->c_cflag & PARENB)
611 cval |= TXX9_SILCR_UPEN;
612 if (!(termios->c_cflag & PARODD))
613 cval |= TXX9_SILCR_UEPS;
614
615 /*
616 * Ask the core to calculate the divisor for us.
617 */
618 baud = uart_get_baud_rate(up, termios, old, 0, up->uartclk/16/2);
619 quot = uart_get_divisor(up, baud);
620
621 /* Set up FIFOs */
622 /* TX Int by FIFO Empty, RX Int by Receiving 1 char. */
623 fcr = TXX9_SIFCR_TDIL_MAX | TXX9_SIFCR_RDIL_1;
624
625 /*
626 * Ok, we're now changing the port state. Do it with
627 * interrupts disabled.
628 */
629 uart_port_lock_irqsave(up, &flags);
630
631 /*
632 * Update the per-port timeout.
633 */
634 uart_update_timeout(up, termios->c_cflag, baud);
635
636 up->read_status_mask = TXX9_SIDISR_UOER |
637 TXX9_SIDISR_TDIS | TXX9_SIDISR_RDIS;
638 if (termios->c_iflag & INPCK)
639 up->read_status_mask |= TXX9_SIDISR_UFER | TXX9_SIDISR_UPER;
640 if (termios->c_iflag & (IGNBRK | BRKINT | PARMRK))
641 up->read_status_mask |= TXX9_SIDISR_UBRK;
642
643 /*
644 * Characteres to ignore
645 */
646 up->ignore_status_mask = 0;
647 if (termios->c_iflag & IGNPAR)
648 up->ignore_status_mask |= TXX9_SIDISR_UPER | TXX9_SIDISR_UFER;
649 if (termios->c_iflag & IGNBRK) {
650 up->ignore_status_mask |= TXX9_SIDISR_UBRK;
651 /*
652 * If we're ignoring parity and break indicators,
653 * ignore overruns too (for real raw support).
654 */
655 if (termios->c_iflag & IGNPAR)
656 up->ignore_status_mask |= TXX9_SIDISR_UOER;
657 }
658
659 /*
660 * ignore all characters if CREAD is not set
661 */
662 if ((termios->c_cflag & CREAD) == 0)
663 up->ignore_status_mask |= TXX9_SIDISR_RDIS;
664
665 /* CTS flow control flag */
666 if ((termios->c_cflag & CRTSCTS) &&
667 (up->flags & UPF_TXX9_HAVE_CTS_LINE)) {
668 sio_set(up, TXX9_SIFLCR,
669 TXX9_SIFLCR_RCS | TXX9_SIFLCR_TES);
670 } else {
671 sio_mask(up, TXX9_SIFLCR,
672 TXX9_SIFLCR_RCS | TXX9_SIFLCR_TES);
673 }
674
675 sio_out(up, TXX9_SILCR, cval);
676 sio_quot_set(up, quot);
677 sio_out(up, TXX9_SIFCR, fcr);
678
679 serial_txx9_set_mctrl(up, up->mctrl);
680 uart_port_unlock_irqrestore(up, flags);
681 }
682
683 static void
684 serial_txx9_pm(struct uart_port *port, unsigned int state,
685 unsigned int oldstate)
686 {
687 /*
688 * If oldstate was -1 this is called from
689 * uart_configure_port(). In this case do not initialize the
690 * port now, because the port was already initialized (for
691 * non-console port) or should not be initialized here (for
692 * console port). If we initialized the port here we lose
693 * serial console settings.
694 */
695 if (state == 0 && oldstate != -1)
696 serial_txx9_initialize(port);
697 }
698
699 static int serial_txx9_request_resource(struct uart_port *up)
700 {
701 unsigned int size = TXX9_REGION_SIZE;
702 int ret = 0;
703
704 switch (up->iotype) {
705 default:
706 if (!up->mapbase)
707 break;
708
709 if (!request_mem_region(up->mapbase, size, "serial_txx9")) {
710 ret = -EBUSY;
711 break;
712 }
713
714 if (up->flags & UPF_IOREMAP) {
715 up->membase = ioremap(up->mapbase, size);
716 if (!up->membase) {
717 release_mem_region(up->mapbase, size);
718 ret = -ENOMEM;
719 }
720 }
721 break;
722
723 case UPIO_PORT:
724 if (!request_region(up->iobase, size, "serial_txx9"))
725 ret = -EBUSY;
726 break;
727 }
728 return ret;
729 }
730
731 static void serial_txx9_release_resource(struct uart_port *up)
732 {
733 unsigned int size = TXX9_REGION_SIZE;
734
735 switch (up->iotype) {
736 default:
737 if (!up->mapbase)
738 break;
739
740 if (up->flags & UPF_IOREMAP) {
741 iounmap(up->membase);
742 up->membase = NULL;
743 }
744
745 release_mem_region(up->mapbase, size);
746 break;
747
748 case UPIO_PORT:
749 release_region(up->iobase, size);
750 break;
751 }
752 }
753
754 static void serial_txx9_release_port(struct uart_port *up)
755 {
756 serial_txx9_release_resource(up);
757 }
758
759 static int serial_txx9_request_port(struct uart_port *up)
760 {
761 return serial_txx9_request_resource(up);
762 }
763
764 static void serial_txx9_config_port(struct uart_port *up, int uflags)
765 {
766 int ret;
767
768 /*
769 * Find the region that we can probe for. This in turn
770 * tells us whether we can probe for the type of port.
771 */
772 ret = serial_txx9_request_resource(up);
773 if (ret < 0)
774 return;
775 up->type = PORT_TXX9;
776 up->fifosize = TXX9_SIO_TX_FIFO;
777
778 #ifdef CONFIG_SERIAL_TXX9_CONSOLE
779 if (up->line == up->cons->index)
780 return;
781 #endif
782 serial_txx9_initialize(up);
783 }
784
785 static const char *
786 serial_txx9_type(struct uart_port *port)
787 {
788 return "txx9";
789 }
790
791 static const struct uart_ops serial_txx9_pops = {
792 .tx_empty = serial_txx9_tx_empty,
793 .set_mctrl = serial_txx9_set_mctrl,
794 .get_mctrl = serial_txx9_get_mctrl,
795 .stop_tx = serial_txx9_stop_tx,
796 .start_tx = serial_txx9_start_tx,
797 .stop_rx = serial_txx9_stop_rx,
798 .break_ctl = serial_txx9_break_ctl,
799 .startup = serial_txx9_startup,
800 .shutdown = serial_txx9_shutdown,
801 .set_termios = serial_txx9_set_termios,
802 .pm = serial_txx9_pm,
803 .type = serial_txx9_type,
804 .release_port = serial_txx9_release_port,
805 .request_port = serial_txx9_request_port,
806 .config_port = serial_txx9_config_port,
807 #ifdef CONFIG_CONSOLE_POLL
808 .poll_get_char = serial_txx9_get_poll_char,
809 .poll_put_char = serial_txx9_put_poll_char,
810 #endif
811 };
812
813 static struct uart_port serial_txx9_ports[UART_NR];
814
815 static void __init serial_txx9_register_ports(struct uart_driver *drv,
816 struct device *dev)
817 {
818 int i;
819
820 for (i = 0; i < UART_NR; i++) {
821 struct uart_port *up = &serial_txx9_ports[i];
822
823 up->line = i;
824 up->ops = &serial_txx9_pops;
825 up->dev = dev;
826 if (up->iobase || up->mapbase)
827 uart_add_one_port(drv, up);
828 }
829 }
830
831 #ifdef CONFIG_SERIAL_TXX9_CONSOLE
832
833 static void serial_txx9_console_putchar(struct uart_port *up, unsigned char ch)
834 {
835 wait_for_xmitr(up);
836 sio_out(up, TXX9_SITFIFO, ch);
837 }
838
839 /*
840 * Print a string to the serial port trying not to disturb
841 * any possible real use of the port...
842 *
843 * The console_lock must be held when we get here.
844 */
845 static void
846 serial_txx9_console_write(struct console *co, const char *s, unsigned int count)
847 {
848 struct uart_port *up = &serial_txx9_ports[co->index];
849 unsigned int ier, flcr;
850
851 /*
852 * First save the UER then disable the interrupts
853 */
854 ier = sio_in(up, TXX9_SIDICR);
855 sio_out(up, TXX9_SIDICR, 0);
856 /*
857 * Disable flow-control if enabled (and unnecessary)
858 */
859 flcr = sio_in(up, TXX9_SIFLCR);
860 if (!(up->flags & UPF_CONS_FLOW) && (flcr & TXX9_SIFLCR_TES))
861 sio_out(up, TXX9_SIFLCR, flcr & ~TXX9_SIFLCR_TES);
862
863 uart_console_write(up, s, count, serial_txx9_console_putchar);
864
865 /*
866 * Finally, wait for transmitter to become empty
867 * and restore the IER
868 */
869 wait_for_xmitr(up);
870 sio_out(up, TXX9_SIFLCR, flcr);
871 sio_out(up, TXX9_SIDICR, ier);
872 }
873
874 static int __init serial_txx9_console_setup(struct console *co, char *options)
875 {
876 struct uart_port *up;
877 int baud = 9600;
878 int bits = 8;
879 int parity = 'n';
880 int flow = 'n';
881
882 /*
883 * Check whether an invalid uart number has been specified, and
884 * if so, search for the first available port that does have
885 * console support.
886 */
887 if (co->index >= UART_NR)
888 co->index = 0;
889 up = &serial_txx9_ports[co->index];
890 if (!up->ops)
891 return -ENODEV;
892
893 serial_txx9_initialize(up);
894
895 if (options)
896 uart_parse_options(options, &baud, &parity, &bits, &flow);
897
898 return uart_set_options(up, co, baud, parity, bits, flow);
899 }
900
901 static struct uart_driver serial_txx9_reg;
902 static struct console serial_txx9_console = {
903 .name = TXX9_TTY_NAME,
904 .write = serial_txx9_console_write,
905 .device = uart_console_device,
906 .setup = serial_txx9_console_setup,
907 .flags = CON_PRINTBUFFER,
908 .index = -1,
909 .data = &serial_txx9_reg,
910 };
911
912 static int __init serial_txx9_console_init(void)
913 {
914 register_console(&serial_txx9_console);
915 return 0;
916 }
917 console_initcall(serial_txx9_console_init);
918
919 #define SERIAL_TXX9_CONSOLE &serial_txx9_console
920 #else
921 #define SERIAL_TXX9_CONSOLE NULL
922 #endif
923
924 static struct uart_driver serial_txx9_reg = {
925 .owner = THIS_MODULE,
926 .driver_name = "serial_txx9",
927 .dev_name = TXX9_TTY_NAME,
928 .major = TXX9_TTY_MAJOR,
929 .minor = TXX9_TTY_MINOR_START,
930 .nr = UART_NR,
931 .cons = SERIAL_TXX9_CONSOLE,
932 };
933
934 int __init early_serial_txx9_setup(struct uart_port *port)
935 {
936 if (port->line >= ARRAY_SIZE(serial_txx9_ports))
937 return -ENODEV;
938
939 serial_txx9_ports[port->line] = *port;
940 serial_txx9_ports[port->line].ops = &serial_txx9_pops;
941 serial_txx9_ports[port->line].flags |=
942 UPF_BOOT_AUTOCONF | UPF_FIXED_PORT;
943 return 0;
944 }
945
946 static DEFINE_MUTEX(serial_txx9_mutex);
947
948 /**
949 * serial_txx9_register_port - register a serial port
950 * @port: serial port template
951 *
952 * Configure the serial port specified by the request.
953 *
954 * The port is then probed and if necessary the IRQ is autodetected
955 * If this fails an error is returned.
956 *
957 * On success the port is ready to use and the line number is returned.
958 */
959 static int serial_txx9_register_port(struct uart_port *port)
960 {
961 int i;
962 struct uart_port *uart;
963 int ret = -ENOSPC;
964
965 mutex_lock(&serial_txx9_mutex);
966 for (i = 0; i < UART_NR; i++) {
967 uart = &serial_txx9_ports[i];
968 if (uart_match_port(uart, port)) {
969 uart_remove_one_port(&serial_txx9_reg, uart);
970 break;
971 }
972 }
973 if (i == UART_NR) {
974 /* Find unused port */
975 for (i = 0; i < UART_NR; i++) {
976 uart = &serial_txx9_ports[i];
977 if (!(uart->iobase || uart->mapbase))
978 break;
979 }
980 }
981 if (i < UART_NR) {
982 uart->iobase = port->iobase;
983 uart->membase = port->membase;
984 uart->irq = port->irq;
985 uart->uartclk = port->uartclk;
986 uart->iotype = port->iotype;
987 uart->flags = port->flags
988 | UPF_BOOT_AUTOCONF | UPF_FIXED_PORT;
989 uart->mapbase = port->mapbase;
990 if (port->dev)
991 uart->dev = port->dev;
992 ret = uart_add_one_port(&serial_txx9_reg, uart);
993 if (ret == 0)
994 ret = uart->line;
995 }
996 mutex_unlock(&serial_txx9_mutex);
997 return ret;
998 }
999
1000 /**
1001 * serial_txx9_unregister_port - remove a txx9 serial port at runtime
1002 * @line: serial line number
1003 *
1004 * Remove one serial port. This may not be called from interrupt
1005 * context. We hand the port back to the our control.
1006 */
1007 static void serial_txx9_unregister_port(int line)
1008 {
1009 struct uart_port *uart = &serial_txx9_ports[line];
1010
1011 mutex_lock(&serial_txx9_mutex);
1012 uart_remove_one_port(&serial_txx9_reg, uart);
1013 uart->flags = 0;
1014 uart->type = PORT_UNKNOWN;
1015 uart->iobase = 0;
1016 uart->mapbase = 0;
1017 uart->membase = NULL;
1018 uart->dev = NULL;
1019 mutex_unlock(&serial_txx9_mutex);
1020 }
1021
1022 /*
1023 * Register a set of serial devices attached to a platform device.
1024 */
1025 static int serial_txx9_probe(struct platform_device *dev)
1026 {
1027 struct uart_port *p = dev_get_platdata(&dev->dev);
1028 struct uart_port port;
1029 int ret, i;
1030
1031 memset(&port, 0, sizeof(struct uart_port));
1032 for (i = 0; p && p->uartclk != 0; p++, i++) {
1033 port.iobase = p->iobase;
1034 port.membase = p->membase;
1035 port.irq = p->irq;
1036 port.uartclk = p->uartclk;
1037 port.iotype = p->iotype;
1038 port.flags = p->flags;
1039 port.mapbase = p->mapbase;
1040 port.dev = &dev->dev;
1041 port.has_sysrq = IS_ENABLED(CONFIG_SERIAL_TXX9_CONSOLE);
1042 ret = serial_txx9_register_port(&port);
1043 if (ret < 0) {
1044 dev_err(&dev->dev, "unable to register port at index %d "
1045 "(IO%lx MEM%llx IRQ%d): %d\n", i,
1046 p->iobase, (unsigned long long)p->mapbase,
1047 p->irq, ret);
1048 }
1049 }
1050 return 0;
1051 }
1052
1053 /*
1054 * Remove serial ports registered against a platform device.
1055 */
1056 static void serial_txx9_remove(struct platform_device *dev)
1057 {
1058 int i;
1059
1060 for (i = 0; i < UART_NR; i++) {
1061 struct uart_port *up = &serial_txx9_ports[i];
1062
1063 if (up->dev == &dev->dev)
1064 serial_txx9_unregister_port(i);
1065 }
1066 }
1067
1068 #ifdef CONFIG_PM
1069 static int serial_txx9_suspend(struct platform_device *dev, pm_message_t state)
1070 {
1071 int i;
1072
1073 for (i = 0; i < UART_NR; i++) {
1074 struct uart_port *up = &serial_txx9_ports[i];
1075
1076 if (up->type != PORT_UNKNOWN && up->dev == &dev->dev)
1077 uart_suspend_port(&serial_txx9_reg, up);
1078 }
1079
1080 return 0;
1081 }
1082
1083 static int serial_txx9_resume(struct platform_device *dev)
1084 {
1085 int i;
1086
1087 for (i = 0; i < UART_NR; i++) {
1088 struct uart_port *up = &serial_txx9_ports[i];
1089
1090 if (up->type != PORT_UNKNOWN && up->dev == &dev->dev)
1091 uart_resume_port(&serial_txx9_reg, up);
1092 }
1093
1094 return 0;
1095 }
1096 #endif
1097
1098 static struct platform_driver serial_txx9_plat_driver = {
1099 .probe = serial_txx9_probe,
1100 .remove = serial_txx9_remove,
1101 #ifdef CONFIG_PM
1102 .suspend = serial_txx9_suspend,
1103 .resume = serial_txx9_resume,
1104 #endif
1105 .driver = {
1106 .name = "serial_txx9",
1107 },
1108 };
1109
1110 #ifdef ENABLE_SERIAL_TXX9_PCI
1111 /*
1112 * Probe one serial board. Unfortunately, there is no rhyme nor reason
1113 * to the arrangement of serial ports on a PCI card.
1114 */
1115 static int
1116 pciserial_txx9_init_one(struct pci_dev *dev, const struct pci_device_id *ent)
1117 {
1118 struct uart_port port;
1119 int line;
1120 int rc;
1121
1122 rc = pci_enable_device(dev);
1123 if (rc)
1124 return rc;
1125
1126 memset(&port, 0, sizeof(port));
1127 port.ops = &serial_txx9_pops;
1128 port.flags |= UPF_TXX9_HAVE_CTS_LINE;
1129 port.uartclk = 66670000;
1130 port.irq = dev->irq;
1131 port.iotype = UPIO_PORT;
1132 port.iobase = pci_resource_start(dev, 1);
1133 port.dev = &dev->dev;
1134 line = serial_txx9_register_port(&port);
1135 if (line < 0) {
1136 printk(KERN_WARNING "Couldn't register serial port %s: %d\n", pci_name(dev), line);
1137 pci_disable_device(dev);
1138 return line;
1139 }
1140 pci_set_drvdata(dev, &serial_txx9_ports[line]);
1141
1142 return 0;
1143 }
1144
1145 static void pciserial_txx9_remove_one(struct pci_dev *dev)
1146 {
1147 struct uart_port *up = pci_get_drvdata(dev);
1148
1149 if (up) {
1150 serial_txx9_unregister_port(up->line);
1151 pci_disable_device(dev);
1152 }
1153 }
1154
1155 #ifdef CONFIG_PM
1156 static int pciserial_txx9_suspend_one(struct pci_dev *dev, pm_message_t state)
1157 {
1158 struct uart_port *up = pci_get_drvdata(dev);
1159
1160 if (up)
1161 uart_suspend_port(&serial_txx9_reg, up);
1162 pci_save_state(dev);
1163 pci_set_power_state(dev, pci_choose_state(dev, state));
1164 return 0;
1165 }
1166
1167 static int pciserial_txx9_resume_one(struct pci_dev *dev)
1168 {
1169 struct uart_port *up = pci_get_drvdata(dev);
1170
1171 pci_set_power_state(dev, PCI_D0);
1172 pci_restore_state(dev);
1173 if (up)
1174 uart_resume_port(&serial_txx9_reg, up);
1175 return 0;
1176 }
1177 #endif
1178
1179 static const struct pci_device_id serial_txx9_pci_tbl[] = {
1180 { PCI_DEVICE(PCI_VENDOR_ID_TOSHIBA_2, PCI_DEVICE_ID_TOSHIBA_TC86C001_MISC) },
1181 { 0, }
1182 };
1183
1184 static struct pci_driver serial_txx9_pci_driver = {
1185 .name = "serial_txx9",
1186 .probe = pciserial_txx9_init_one,
1187 .remove = pciserial_txx9_remove_one,
1188 #ifdef CONFIG_PM
1189 .suspend = pciserial_txx9_suspend_one,
1190 .resume = pciserial_txx9_resume_one,
1191 #endif
1192 .id_table = serial_txx9_pci_tbl,
1193 };
1194
1195 MODULE_DEVICE_TABLE(pci, serial_txx9_pci_tbl);
1196 #endif /* ENABLE_SERIAL_TXX9_PCI */
1197
1198 static struct platform_device *serial_txx9_plat_devs;
1199
1200 static int __init serial_txx9_init(void)
1201 {
1202 int ret;
1203
1204 ret = uart_register_driver(&serial_txx9_reg);
1205 if (ret)
1206 goto out;
1207
1208 serial_txx9_plat_devs = platform_device_alloc("serial_txx9", -1);
1209 if (!serial_txx9_plat_devs) {
1210 ret = -ENOMEM;
1211 goto unreg_uart_drv;
1212 }
1213
1214 ret = platform_device_add(serial_txx9_plat_devs);
1215 if (ret)
1216 goto put_dev;
1217
1218 serial_txx9_register_ports(&serial_txx9_reg,
1219 &serial_txx9_plat_devs->dev);
1220
1221 ret = platform_driver_register(&serial_txx9_plat_driver);
1222 if (ret)
1223 goto del_dev;
1224
1225 #ifdef ENABLE_SERIAL_TXX9_PCI
1226 ret = pci_register_driver(&serial_txx9_pci_driver);
1227 if (ret) {
1228 platform_driver_unregister(&serial_txx9_plat_driver);
1229 }
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_port *up = &serial_txx9_ports[i];
1255 if (up->iobase || up->mapbase)
1256 uart_remove_one_port(&serial_txx9_reg, up);
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);
Kernel DRM miscellaneous fixes and cross-tree changes