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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
27#include <linux/io.h>
28
29#define PASS_LIMIT 256
30
31#if !defined(CONFIG_SERIAL_TXX9_STDSERIAL)
32/* "ttyS" is used for standard serial driver */
33#define TXX9_TTY_NAME "ttyTX"
34#define TXX9_TTY_MINOR_START 196
35#define TXX9_TTY_MAJOR 204
36#else
37/* acts like standard serial driver */
38#define TXX9_TTY_NAME "ttyS"
39#define TXX9_TTY_MINOR_START 64
40#define TXX9_TTY_MAJOR TTY_MAJOR
41#endif
42
43/* flag aliases */
44#define UPF_TXX9_HAVE_CTS_LINE UPF_BUGGY_UART
45#define UPF_TXX9_USE_SCLK UPF_MAGIC_MULTIPLIER
46
47#ifdef CONFIG_PCI
48/* support for Toshiba TC86C001 SIO */
49#define ENABLE_SERIAL_TXX9_PCI
50#endif
51
52/*
53 * Number of serial ports
54 */
55#define UART_NR CONFIG_SERIAL_TXX9_NR_UARTS
56
57#define TXX9_REGION_SIZE 0x24
58
59/* TXX9 Serial Registers */
60#define TXX9_SILCR 0x00
61#define TXX9_SIDICR 0x04
62#define TXX9_SIDISR 0x08
63#define TXX9_SICISR 0x0c
64#define TXX9_SIFCR 0x10
65#define TXX9_SIFLCR 0x14
66#define TXX9_SIBGR 0x18
67#define TXX9_SITFIFO 0x1c
68#define TXX9_SIRFIFO 0x20
69
70/* SILCR : Line Control */
71#define TXX9_SILCR_SCS_MASK 0x00000060
72#define TXX9_SILCR_SCS_IMCLK 0x00000000
73#define TXX9_SILCR_SCS_IMCLK_BG 0x00000020
74#define TXX9_SILCR_SCS_SCLK 0x00000040
75#define TXX9_SILCR_SCS_SCLK_BG 0x00000060
76#define TXX9_SILCR_UEPS 0x00000010
77#define TXX9_SILCR_UPEN 0x00000008
78#define TXX9_SILCR_USBL_MASK 0x00000004
79#define TXX9_SILCR_USBL_1BIT 0x00000000
80#define TXX9_SILCR_USBL_2BIT 0x00000004
81#define TXX9_SILCR_UMODE_MASK 0x00000003
82#define TXX9_SILCR_UMODE_8BIT 0x00000000
83#define TXX9_SILCR_UMODE_7BIT 0x00000001
84
85/* SIDICR : DMA/Int. Control */
86#define TXX9_SIDICR_TDE 0x00008000
87#define TXX9_SIDICR_RDE 0x00004000
88#define TXX9_SIDICR_TIE 0x00002000
89#define TXX9_SIDICR_RIE 0x00001000
90#define TXX9_SIDICR_SPIE 0x00000800
91#define TXX9_SIDICR_CTSAC 0x00000600
92#define TXX9_SIDICR_STIE_MASK 0x0000003f
93#define TXX9_SIDICR_STIE_OERS 0x00000020
94#define TXX9_SIDICR_STIE_CTSS 0x00000010
95#define TXX9_SIDICR_STIE_RBRKD 0x00000008
96#define TXX9_SIDICR_STIE_TRDY 0x00000004
97#define TXX9_SIDICR_STIE_TXALS 0x00000002
98#define TXX9_SIDICR_STIE_UBRKD 0x00000001
99
100/* SIDISR : DMA/Int. Status */
101#define TXX9_SIDISR_UBRK 0x00008000
102#define TXX9_SIDISR_UVALID 0x00004000
103#define TXX9_SIDISR_UFER 0x00002000
104#define TXX9_SIDISR_UPER 0x00001000
105#define TXX9_SIDISR_UOER 0x00000800
106#define TXX9_SIDISR_ERI 0x00000400
107#define TXX9_SIDISR_TOUT 0x00000200
108#define TXX9_SIDISR_TDIS 0x00000100
109#define TXX9_SIDISR_RDIS 0x00000080
110#define TXX9_SIDISR_STIS 0x00000040
111#define TXX9_SIDISR_RFDN_MASK 0x0000001f
112
113/* SICISR : Change Int. Status */
114#define TXX9_SICISR_OERS 0x00000020
115#define TXX9_SICISR_CTSS 0x00000010
116#define TXX9_SICISR_RBRKD 0x00000008
117#define TXX9_SICISR_TRDY 0x00000004
118#define TXX9_SICISR_TXALS 0x00000002
119#define TXX9_SICISR_UBRKD 0x00000001
120
121/* SIFCR : FIFO Control */
122#define TXX9_SIFCR_SWRST 0x00008000
123#define TXX9_SIFCR_RDIL_MASK 0x00000180
124#define TXX9_SIFCR_RDIL_1 0x00000000
125#define TXX9_SIFCR_RDIL_4 0x00000080
126#define TXX9_SIFCR_RDIL_8 0x00000100
127#define TXX9_SIFCR_RDIL_12 0x00000180
128#define TXX9_SIFCR_RDIL_MAX 0x00000180
129#define TXX9_SIFCR_TDIL_MASK 0x00000018
130#define TXX9_SIFCR_TDIL_1 0x00000000
131#define TXX9_SIFCR_TDIL_4 0x00000001
132#define TXX9_SIFCR_TDIL_8 0x00000010
133#define TXX9_SIFCR_TDIL_MAX 0x00000010
134#define TXX9_SIFCR_TFRST 0x00000004
135#define TXX9_SIFCR_RFRST 0x00000002
136#define TXX9_SIFCR_FRSTE 0x00000001
137#define TXX9_SIO_TX_FIFO 8
138#define TXX9_SIO_RX_FIFO 16
139
140/* SIFLCR : Flow Control */
141#define TXX9_SIFLCR_RCS 0x00001000
142#define TXX9_SIFLCR_TES 0x00000800
143#define TXX9_SIFLCR_RTSSC 0x00000200
144#define TXX9_SIFLCR_RSDE 0x00000100
145#define TXX9_SIFLCR_TSDE 0x00000080
146#define TXX9_SIFLCR_RTSTL_MASK 0x0000001e
147#define TXX9_SIFLCR_RTSTL_MAX 0x0000001e
148#define TXX9_SIFLCR_TBRK 0x00000001
149
150/* SIBGR : Baudrate Control */
151#define TXX9_SIBGR_BCLK_MASK 0x00000300
152#define TXX9_SIBGR_BCLK_T0 0x00000000
153#define TXX9_SIBGR_BCLK_T2 0x00000100
154#define TXX9_SIBGR_BCLK_T4 0x00000200
155#define TXX9_SIBGR_BCLK_T6 0x00000300
156#define TXX9_SIBGR_BRD_MASK 0x000000ff
157
158static inline unsigned int sio_in(struct uart_port *up, int offset)
159{
160 switch (up->iotype) {
161 default:
162 return __raw_readl(up->membase + offset);
163 case UPIO_PORT:
164 return inl(up->iobase + offset);
165 }
166}
167
168static inline void
169sio_out(struct uart_port *up, int offset, int value)
170{
171 switch (up->iotype) {
172 default:
173 __raw_writel(value, up->membase + offset);
174 break;
175 case UPIO_PORT:
176 outl(value, up->iobase + offset);
177 break;
178 }
179}
180
181static inline void
182sio_mask(struct uart_port *up, int offset, unsigned int value)
183{
184 sio_out(up, offset, sio_in(up, offset) & ~value);
185}
186static inline void
187sio_set(struct uart_port *up, int offset, unsigned int value)
188{
189 sio_out(up, offset, sio_in(up, offset) | value);
190}
191
192static inline void
193sio_quot_set(struct uart_port *up, int quot)
194{
195 quot >>= 1;
196 if (quot < 256)
197 sio_out(up, TXX9_SIBGR, quot | TXX9_SIBGR_BCLK_T0);
198 else if (quot < (256 << 2))
199 sio_out(up, TXX9_SIBGR, (quot >> 2) | TXX9_SIBGR_BCLK_T2);
200 else if (quot < (256 << 4))
201 sio_out(up, TXX9_SIBGR, (quot >> 4) | TXX9_SIBGR_BCLK_T4);
202 else if (quot < (256 << 6))
203 sio_out(up, TXX9_SIBGR, (quot >> 6) | TXX9_SIBGR_BCLK_T6);
204 else
205 sio_out(up, TXX9_SIBGR, 0xff | TXX9_SIBGR_BCLK_T6);
206}
207
208static void serial_txx9_stop_tx(struct uart_port *up)
209{
210 sio_mask(up, TXX9_SIDICR, TXX9_SIDICR_TIE);
211}
212
213static void serial_txx9_start_tx(struct uart_port *up)
214{
215 sio_set(up, TXX9_SIDICR, TXX9_SIDICR_TIE);
216}
217
218static void serial_txx9_stop_rx(struct uart_port *up)
219{
220 up->read_status_mask &= ~TXX9_SIDISR_RDIS;
221}
222
223static void serial_txx9_initialize(struct uart_port *up)
224{
225 unsigned int tmout = 10000;
226
227 sio_out(up, TXX9_SIFCR, TXX9_SIFCR_SWRST);
228 /* TX4925 BUG WORKAROUND. Accessing SIOC register
229 * immediately after soft reset causes bus error. */
230 udelay(1);
231 while ((sio_in(up, TXX9_SIFCR) & TXX9_SIFCR_SWRST) && --tmout)
232 udelay(1);
233 /* TX Int by FIFO Empty, RX Int by Receiving 1 char. */
234 sio_set(up, TXX9_SIFCR,
235 TXX9_SIFCR_TDIL_MAX | TXX9_SIFCR_RDIL_1);
236 /* initial settings */
237 sio_out(up, TXX9_SILCR,
238 TXX9_SILCR_UMODE_8BIT | TXX9_SILCR_USBL_1BIT |
239 ((up->flags & UPF_TXX9_USE_SCLK) ?
240 TXX9_SILCR_SCS_SCLK_BG : TXX9_SILCR_SCS_IMCLK_BG));
241 sio_quot_set(up, uart_get_divisor(up, 9600));
242 sio_out(up, TXX9_SIFLCR, TXX9_SIFLCR_RTSTL_MAX /* 15 */);
243 sio_out(up, TXX9_SIDICR, 0);
244}
245
246static inline void
247receive_chars(struct uart_port *up, unsigned int *status)
248{
249 unsigned int disr = *status;
250 int max_count = 256;
251 unsigned int next_ignore_status_mask;
252 u8 ch, flag;
253
254 do {
255 ch = sio_in(up, TXX9_SIRFIFO);
256 flag = TTY_NORMAL;
257 up->icount.rx++;
258
259 /* mask out RFDN_MASK bit added by previous overrun */
260 next_ignore_status_mask =
261 up->ignore_status_mask & ~TXX9_SIDISR_RFDN_MASK;
262 if (unlikely(disr & (TXX9_SIDISR_UBRK | TXX9_SIDISR_UPER |
263 TXX9_SIDISR_UFER | TXX9_SIDISR_UOER))) {
264 /*
265 * For statistics only
266 */
267 if (disr & TXX9_SIDISR_UBRK) {
268 disr &= ~(TXX9_SIDISR_UFER | TXX9_SIDISR_UPER);
269 up->icount.brk++;
270 /*
271 * We do the SysRQ and SAK checking
272 * here because otherwise the break
273 * may get masked by ignore_status_mask
274 * or read_status_mask.
275 */
276 if (uart_handle_break(up))
277 goto ignore_char;
278 } else if (disr & TXX9_SIDISR_UPER)
279 up->icount.parity++;
280 else if (disr & TXX9_SIDISR_UFER)
281 up->icount.frame++;
282 if (disr & TXX9_SIDISR_UOER) {
283 up->icount.overrun++;
284 /*
285 * The receiver read buffer still hold
286 * a char which caused overrun.
287 * Ignore next char by adding RFDN_MASK
288 * to ignore_status_mask temporarily.
289 */
290 next_ignore_status_mask |=
291 TXX9_SIDISR_RFDN_MASK;
292 }
293
294 /*
295 * Mask off conditions which should be ingored.
296 */
297 disr &= up->read_status_mask;
298
299 if (disr & TXX9_SIDISR_UBRK) {
300 flag = TTY_BREAK;
301 } else if (disr & TXX9_SIDISR_UPER)
302 flag = TTY_PARITY;
303 else if (disr & TXX9_SIDISR_UFER)
304 flag = TTY_FRAME;
305 }
306 if (uart_handle_sysrq_char(up, ch))
307 goto ignore_char;
308
309 uart_insert_char(up, disr, TXX9_SIDISR_UOER, ch, flag);
310
311 ignore_char:
312 up->ignore_status_mask = next_ignore_status_mask;
313 disr = sio_in(up, TXX9_SIDISR);
314 } while (!(disr & TXX9_SIDISR_UVALID) && (max_count-- > 0));
315
316 tty_flip_buffer_push(&up->state->port);
317
318 *status = disr;
319}
320
321static inline void transmit_chars(struct uart_port *up)
322{
323 u8 ch;
324
325 uart_port_tx_limited(up, ch, TXX9_SIO_TX_FIFO,
326 true,
327 sio_out(up, TXX9_SITFIFO, ch),
328 ({}));
329}
330
331static irqreturn_t serial_txx9_interrupt(int irq, void *dev_id)
332{
333 int pass_counter = 0;
334 struct uart_port *up = dev_id;
335 unsigned int status;
336
337 while (1) {
338 uart_port_lock(up);
339 status = sio_in(up, TXX9_SIDISR);
340 if (!(sio_in(up, TXX9_SIDICR) & TXX9_SIDICR_TIE))
341 status &= ~TXX9_SIDISR_TDIS;
342 if (!(status & (TXX9_SIDISR_TDIS | TXX9_SIDISR_RDIS |
343 TXX9_SIDISR_TOUT))) {
344 uart_port_unlock(up);
345 break;
346 }
347
348 if (status & TXX9_SIDISR_RDIS)
349 receive_chars(up, &status);
350 if (status & TXX9_SIDISR_TDIS)
351 transmit_chars(up);
352 /* Clear TX/RX Int. Status */
353 sio_mask(up, TXX9_SIDISR,
354 TXX9_SIDISR_TDIS | TXX9_SIDISR_RDIS |
355 TXX9_SIDISR_TOUT);
356 uart_port_unlock(up);
357
358 if (pass_counter++ > PASS_LIMIT)
359 break;
360 }
361
362 return pass_counter ? IRQ_HANDLED : IRQ_NONE;
363}
364
365static unsigned int serial_txx9_tx_empty(struct uart_port *up)
366{
367 unsigned long flags;
368 unsigned int ret;
369
370 uart_port_lock_irqsave(up, &flags);
371 ret = (sio_in(up, TXX9_SICISR) & TXX9_SICISR_TXALS) ? TIOCSER_TEMT : 0;
372 uart_port_unlock_irqrestore(up, flags);
373
374 return ret;
375}
376
377static unsigned int serial_txx9_get_mctrl(struct uart_port *up)
378{
379 unsigned int ret;
380
381 /* no modem control lines */
382 ret = TIOCM_CAR | TIOCM_DSR;
383 ret |= (sio_in(up, TXX9_SIFLCR) & TXX9_SIFLCR_RTSSC) ? 0 : TIOCM_RTS;
384 ret |= (sio_in(up, TXX9_SICISR) & TXX9_SICISR_CTSS) ? 0 : TIOCM_CTS;
385
386 return ret;
387}
388
389static void serial_txx9_set_mctrl(struct uart_port *up, unsigned int mctrl)
390{
391
392 if (mctrl & TIOCM_RTS)
393 sio_mask(up, TXX9_SIFLCR, TXX9_SIFLCR_RTSSC);
394 else
395 sio_set(up, TXX9_SIFLCR, TXX9_SIFLCR_RTSSC);
396}
397
398static void serial_txx9_break_ctl(struct uart_port *up, int break_state)
399{
400 unsigned long flags;
401
402 uart_port_lock_irqsave(up, &flags);
403 if (break_state == -1)
404 sio_set(up, TXX9_SIFLCR, TXX9_SIFLCR_TBRK);
405 else
406 sio_mask(up, TXX9_SIFLCR, TXX9_SIFLCR_TBRK);
407 uart_port_unlock_irqrestore(up, flags);
408}
409
410#if defined(CONFIG_SERIAL_TXX9_CONSOLE) || defined(CONFIG_CONSOLE_POLL)
411/*
412 * Wait for transmitter & holding register to empty
413 */
414static void wait_for_xmitr(struct uart_port *up)
415{
416 unsigned int tmout = 10000;
417
418 /* Wait up to 10ms for the character(s) to be sent. */
419 while (--tmout &&
420 !(sio_in(up, TXX9_SICISR) & TXX9_SICISR_TXALS))
421 udelay(1);
422
423 /* Wait up to 1s for flow control if necessary */
424 if (up->flags & UPF_CONS_FLOW) {
425 tmout = 1000000;
426 while (--tmout &&
427 (sio_in(up, TXX9_SICISR) & TXX9_SICISR_CTSS))
428 udelay(1);
429 }
430}
431#endif
432
433#ifdef CONFIG_CONSOLE_POLL
434/*
435 * Console polling routines for writing and reading from the uart while
436 * in an interrupt or debug context.
437 */
438
439static int serial_txx9_get_poll_char(struct uart_port *up)
440{
441 unsigned int ier;
442 unsigned char c;
443
444 /*
445 * First save the IER then disable the interrupts
446 */
447 ier = sio_in(up, TXX9_SIDICR);
448 sio_out(up, TXX9_SIDICR, 0);
449
450 while (sio_in(up, TXX9_SIDISR) & TXX9_SIDISR_UVALID)
451 ;
452
453 c = sio_in(up, TXX9_SIRFIFO);
454
455 /*
456 * Finally, clear RX interrupt status
457 * and restore the IER
458 */
459 sio_mask(up, TXX9_SIDISR, TXX9_SIDISR_RDIS);
460 sio_out(up, TXX9_SIDICR, ier);
461 return c;
462}
463
464
465static void serial_txx9_put_poll_char(struct uart_port *up, unsigned char c)
466{
467 unsigned int ier;
468
469 /*
470 * First save the IER then disable the interrupts
471 */
472 ier = sio_in(up, TXX9_SIDICR);
473 sio_out(up, TXX9_SIDICR, 0);
474
475 wait_for_xmitr(up);
476 /*
477 * Send the character out.
478 */
479 sio_out(up, TXX9_SITFIFO, c);
480
481 /*
482 * Finally, wait for transmitter to become empty
483 * and restore the IER
484 */
485 wait_for_xmitr(up);
486 sio_out(up, TXX9_SIDICR, ier);
487}
488
489#endif /* CONFIG_CONSOLE_POLL */
490
491static int serial_txx9_startup(struct uart_port *up)
492{
493 unsigned long flags;
494 int retval;
495
496 /*
497 * Clear the FIFO buffers and disable them.
498 * (they will be reenabled in set_termios())
499 */
500 sio_set(up, TXX9_SIFCR,
501 TXX9_SIFCR_TFRST | TXX9_SIFCR_RFRST | TXX9_SIFCR_FRSTE);
502 /* clear reset */
503 sio_mask(up, TXX9_SIFCR,
504 TXX9_SIFCR_TFRST | TXX9_SIFCR_RFRST | TXX9_SIFCR_FRSTE);
505 sio_out(up, TXX9_SIDICR, 0);
506
507 /*
508 * Clear the interrupt registers.
509 */
510 sio_out(up, TXX9_SIDISR, 0);
511
512 retval = request_irq(up->irq, serial_txx9_interrupt,
513 IRQF_SHARED, "serial_txx9", up);
514 if (retval)
515 return retval;
516
517 /*
518 * Now, initialize the UART
519 */
520 uart_port_lock_irqsave(up, &flags);
521 serial_txx9_set_mctrl(up, up->mctrl);
522 uart_port_unlock_irqrestore(up, flags);
523
524 /* Enable RX/TX */
525 sio_mask(up, TXX9_SIFLCR, TXX9_SIFLCR_RSDE | TXX9_SIFLCR_TSDE);
526
527 /*
528 * Finally, enable interrupts.
529 */
530 sio_set(up, TXX9_SIDICR, TXX9_SIDICR_RIE);
531
532 return 0;
533}
534
535static void serial_txx9_shutdown(struct uart_port *up)
536{
537 unsigned long flags;
538
539 /*
540 * Disable interrupts from this port
541 */
542 sio_out(up, TXX9_SIDICR, 0); /* disable all intrs */
543
544 uart_port_lock_irqsave(up, &flags);
545 serial_txx9_set_mctrl(up, up->mctrl);
546 uart_port_unlock_irqrestore(up, flags);
547
548 /*
549 * Disable break condition
550 */
551 sio_mask(up, TXX9_SIFLCR, TXX9_SIFLCR_TBRK);
552
553#ifdef CONFIG_SERIAL_TXX9_CONSOLE
554 if (up->cons && up->line == up->cons->index) {
555 free_irq(up->irq, up);
556 return;
557 }
558#endif
559 /* reset FIFOs */
560 sio_set(up, TXX9_SIFCR,
561 TXX9_SIFCR_TFRST | TXX9_SIFCR_RFRST | TXX9_SIFCR_FRSTE);
562 /* clear reset */
563 sio_mask(up, TXX9_SIFCR,
564 TXX9_SIFCR_TFRST | TXX9_SIFCR_RFRST | TXX9_SIFCR_FRSTE);
565
566 /* Disable RX/TX */
567 sio_set(up, TXX9_SIFLCR, TXX9_SIFLCR_RSDE | TXX9_SIFLCR_TSDE);
568
569 free_irq(up->irq, up);
570}
571
572static void
573serial_txx9_set_termios(struct uart_port *up, struct ktermios *termios,
574 const struct ktermios *old)
575{
576 unsigned int cval, fcr = 0;
577 unsigned long flags;
578 unsigned int baud, quot;
579
580 /*
581 * We don't support modem control lines.
582 */
583 termios->c_cflag &= ~(HUPCL | CMSPAR);
584 termios->c_cflag |= CLOCAL;
585
586 cval = sio_in(up, TXX9_SILCR);
587 /* byte size and parity */
588 cval &= ~TXX9_SILCR_UMODE_MASK;
589 switch (termios->c_cflag & CSIZE) {
590 case CS7:
591 cval |= TXX9_SILCR_UMODE_7BIT;
592 break;
593 default:
594 case CS5: /* not supported */
595 case CS6: /* not supported */
596 case CS8:
597 cval |= TXX9_SILCR_UMODE_8BIT;
598 termios->c_cflag &= ~CSIZE;
599 termios->c_cflag |= CS8;
600 break;
601 }
602
603 cval &= ~TXX9_SILCR_USBL_MASK;
604 if (termios->c_cflag & CSTOPB)
605 cval |= TXX9_SILCR_USBL_2BIT;
606 else
607 cval |= TXX9_SILCR_USBL_1BIT;
608 cval &= ~(TXX9_SILCR_UPEN | TXX9_SILCR_UEPS);
609 if (termios->c_cflag & PARENB)
610 cval |= TXX9_SILCR_UPEN;
611 if (!(termios->c_cflag & PARODD))
612 cval |= TXX9_SILCR_UEPS;
613
614 /*
615 * Ask the core to calculate the divisor for us.
616 */
617 baud = uart_get_baud_rate(up, termios, old, 0, up->uartclk/16/2);
618 quot = uart_get_divisor(up, baud);
619
620 /* Set up FIFOs */
621 /* TX Int by FIFO Empty, RX Int by Receiving 1 char. */
622 fcr = TXX9_SIFCR_TDIL_MAX | TXX9_SIFCR_RDIL_1;
623
624 /*
625 * Ok, we're now changing the port state. Do it with
626 * interrupts disabled.
627 */
628 uart_port_lock_irqsave(up, &flags);
629
630 /*
631 * Update the per-port timeout.
632 */
633 uart_update_timeout(up, termios->c_cflag, baud);
634
635 up->read_status_mask = TXX9_SIDISR_UOER |
636 TXX9_SIDISR_TDIS | TXX9_SIDISR_RDIS;
637 if (termios->c_iflag & INPCK)
638 up->read_status_mask |= TXX9_SIDISR_UFER | TXX9_SIDISR_UPER;
639 if (termios->c_iflag & (IGNBRK | BRKINT | PARMRK))
640 up->read_status_mask |= TXX9_SIDISR_UBRK;
641
642 /*
643 * Characteres to ignore
644 */
645 up->ignore_status_mask = 0;
646 if (termios->c_iflag & IGNPAR)
647 up->ignore_status_mask |= TXX9_SIDISR_UPER | TXX9_SIDISR_UFER;
648 if (termios->c_iflag & IGNBRK) {
649 up->ignore_status_mask |= TXX9_SIDISR_UBRK;
650 /*
651 * If we're ignoring parity and break indicators,
652 * ignore overruns too (for real raw support).
653 */
654 if (termios->c_iflag & IGNPAR)
655 up->ignore_status_mask |= TXX9_SIDISR_UOER;
656 }
657
658 /*
659 * ignore all characters if CREAD is not set
660 */
661 if ((termios->c_cflag & CREAD) == 0)
662 up->ignore_status_mask |= TXX9_SIDISR_RDIS;
663
664 /* CTS flow control flag */
665 if ((termios->c_cflag & CRTSCTS) &&
666 (up->flags & UPF_TXX9_HAVE_CTS_LINE)) {
667 sio_set(up, TXX9_SIFLCR,
668 TXX9_SIFLCR_RCS | TXX9_SIFLCR_TES);
669 } else {
670 sio_mask(up, TXX9_SIFLCR,
671 TXX9_SIFLCR_RCS | TXX9_SIFLCR_TES);
672 }
673
674 sio_out(up, TXX9_SILCR, cval);
675 sio_quot_set(up, quot);
676 sio_out(up, TXX9_SIFCR, fcr);
677
678 serial_txx9_set_mctrl(up, up->mctrl);
679 uart_port_unlock_irqrestore(up, flags);
680}
681
682static void
683serial_txx9_pm(struct uart_port *port, unsigned int state,
684 unsigned int oldstate)
685{
686 /*
687 * If oldstate was -1 this is called from
688 * uart_configure_port(). In this case do not initialize the
689 * port now, because the port was already initialized (for
690 * non-console port) or should not be initialized here (for
691 * console port). If we initialized the port here we lose
692 * serial console settings.
693 */
694 if (state == 0 && oldstate != -1)
695 serial_txx9_initialize(port);
696}
697
698static int serial_txx9_request_resource(struct uart_port *up)
699{
700 unsigned int size = TXX9_REGION_SIZE;
701 int ret = 0;
702
703 switch (up->iotype) {
704 default:
705 if (!up->mapbase)
706 break;
707
708 if (!request_mem_region(up->mapbase, size, "serial_txx9")) {
709 ret = -EBUSY;
710 break;
711 }
712
713 if (up->flags & UPF_IOREMAP) {
714 up->membase = ioremap(up->mapbase, size);
715 if (!up->membase) {
716 release_mem_region(up->mapbase, size);
717 ret = -ENOMEM;
718 }
719 }
720 break;
721
722 case UPIO_PORT:
723 if (!request_region(up->iobase, size, "serial_txx9"))
724 ret = -EBUSY;
725 break;
726 }
727 return ret;
728}
729
730static void serial_txx9_release_resource(struct uart_port *up)
731{
732 unsigned int size = TXX9_REGION_SIZE;
733
734 switch (up->iotype) {
735 default:
736 if (!up->mapbase)
737 break;
738
739 if (up->flags & UPF_IOREMAP) {
740 iounmap(up->membase);
741 up->membase = NULL;
742 }
743
744 release_mem_region(up->mapbase, size);
745 break;
746
747 case UPIO_PORT:
748 release_region(up->iobase, size);
749 break;
750 }
751}
752
753static void serial_txx9_release_port(struct uart_port *up)
754{
755 serial_txx9_release_resource(up);
756}
757
758static int serial_txx9_request_port(struct uart_port *up)
759{
760 return serial_txx9_request_resource(up);
761}
762
763static void serial_txx9_config_port(struct uart_port *up, int uflags)
764{
765 int ret;
766
767 /*
768 * Find the region that we can probe for. This in turn
769 * tells us whether we can probe for the type of port.
770 */
771 ret = serial_txx9_request_resource(up);
772 if (ret < 0)
773 return;
774 up->type = PORT_TXX9;
775 up->fifosize = TXX9_SIO_TX_FIFO;
776
777#ifdef CONFIG_SERIAL_TXX9_CONSOLE
778 if (up->line == up->cons->index)
779 return;
780#endif
781 serial_txx9_initialize(up);
782}
783
784static const char *
785serial_txx9_type(struct uart_port *port)
786{
787 return "txx9";
788}
789
790static const struct uart_ops serial_txx9_pops = {
791 .tx_empty = serial_txx9_tx_empty,
792 .set_mctrl = serial_txx9_set_mctrl,
793 .get_mctrl = serial_txx9_get_mctrl,
794 .stop_tx = serial_txx9_stop_tx,
795 .start_tx = serial_txx9_start_tx,
796 .stop_rx = serial_txx9_stop_rx,
797 .break_ctl = serial_txx9_break_ctl,
798 .startup = serial_txx9_startup,
799 .shutdown = serial_txx9_shutdown,
800 .set_termios = serial_txx9_set_termios,
801 .pm = serial_txx9_pm,
802 .type = serial_txx9_type,
803 .release_port = serial_txx9_release_port,
804 .request_port = serial_txx9_request_port,
805 .config_port = serial_txx9_config_port,
806#ifdef CONFIG_CONSOLE_POLL
807 .poll_get_char = serial_txx9_get_poll_char,
808 .poll_put_char = serial_txx9_put_poll_char,
809#endif
810};
811
812static struct uart_port serial_txx9_ports[UART_NR];
813
814static void __init serial_txx9_register_ports(struct uart_driver *drv,
815 struct device *dev)
816{
817 int i;
818
819 for (i = 0; i < UART_NR; i++) {
820 struct uart_port *up = &serial_txx9_ports[i];
821
822 up->line = i;
823 up->ops = &serial_txx9_pops;
824 up->dev = dev;
825 if (up->iobase || up->mapbase)
826 uart_add_one_port(drv, up);
827 }
828}
829
830#ifdef CONFIG_SERIAL_TXX9_CONSOLE
831
832static void serial_txx9_console_putchar(struct uart_port *up, unsigned char ch)
833{
834 wait_for_xmitr(up);
835 sio_out(up, TXX9_SITFIFO, ch);
836}
837
838/*
839 * Print a string to the serial port trying not to disturb
840 * any possible real use of the port...
841 *
842 * The console_lock must be held when we get here.
843 */
844static void
845serial_txx9_console_write(struct console *co, const char *s, unsigned int count)
846{
847 struct uart_port *up = &serial_txx9_ports[co->index];
848 unsigned int ier, flcr;
849
850 /*
851 * First save the UER then disable the interrupts
852 */
853 ier = sio_in(up, TXX9_SIDICR);
854 sio_out(up, TXX9_SIDICR, 0);
855 /*
856 * Disable flow-control if enabled (and unnecessary)
857 */
858 flcr = sio_in(up, TXX9_SIFLCR);
859 if (!(up->flags & UPF_CONS_FLOW) && (flcr & TXX9_SIFLCR_TES))
860 sio_out(up, TXX9_SIFLCR, flcr & ~TXX9_SIFLCR_TES);
861
862 uart_console_write(up, s, count, serial_txx9_console_putchar);
863
864 /*
865 * Finally, wait for transmitter to become empty
866 * and restore the IER
867 */
868 wait_for_xmitr(up);
869 sio_out(up, TXX9_SIFLCR, flcr);
870 sio_out(up, TXX9_SIDICR, ier);
871}
872
873static int __init serial_txx9_console_setup(struct console *co, char *options)
874{
875 struct uart_port *up;
876 int baud = 9600;
877 int bits = 8;
878 int parity = 'n';
879 int flow = 'n';
880
881 /*
882 * Check whether an invalid uart number has been specified, and
883 * if so, search for the first available port that does have
884 * console support.
885 */
886 if (co->index >= UART_NR)
887 co->index = 0;
888 up = &serial_txx9_ports[co->index];
889 if (!up->ops)
890 return -ENODEV;
891
892 serial_txx9_initialize(up);
893
894 if (options)
895 uart_parse_options(options, &baud, &parity, &bits, &flow);
896
897 return uart_set_options(up, co, baud, parity, bits, flow);
898}
899
900static struct uart_driver serial_txx9_reg;
901static struct console serial_txx9_console = {
902 .name = TXX9_TTY_NAME,
903 .write = serial_txx9_console_write,
904 .device = uart_console_device,
905 .setup = serial_txx9_console_setup,
906 .flags = CON_PRINTBUFFER,
907 .index = -1,
908 .data = &serial_txx9_reg,
909};
910
911static int __init serial_txx9_console_init(void)
912{
913 register_console(&serial_txx9_console);
914 return 0;
915}
916console_initcall(serial_txx9_console_init);
917
918#define SERIAL_TXX9_CONSOLE &serial_txx9_console
919#else
920#define SERIAL_TXX9_CONSOLE NULL
921#endif
922
923static struct uart_driver serial_txx9_reg = {
924 .owner = THIS_MODULE,
925 .driver_name = "serial_txx9",
926 .dev_name = TXX9_TTY_NAME,
927 .major = TXX9_TTY_MAJOR,
928 .minor = TXX9_TTY_MINOR_START,
929 .nr = UART_NR,
930 .cons = SERIAL_TXX9_CONSOLE,
931};
932
933int __init early_serial_txx9_setup(struct uart_port *port)
934{
935 if (port->line >= ARRAY_SIZE(serial_txx9_ports))
936 return -ENODEV;
937
938 serial_txx9_ports[port->line] = *port;
939 serial_txx9_ports[port->line].ops = &serial_txx9_pops;
940 serial_txx9_ports[port->line].flags |=
941 UPF_BOOT_AUTOCONF | UPF_FIXED_PORT;
942 return 0;
943}
944
945static DEFINE_MUTEX(serial_txx9_mutex);
946
947/**
948 * serial_txx9_register_port - register a serial port
949 * @port: serial port template
950 *
951 * Configure the serial port specified by the request.
952 *
953 * The port is then probed and if necessary the IRQ is autodetected
954 * If this fails an error is returned.
955 *
956 * On success the port is ready to use and the line number is returned.
957 */
958static int serial_txx9_register_port(struct uart_port *port)
959{
960 int i;
961 struct uart_port *uart;
962 int ret = -ENOSPC;
963
964 mutex_lock(&serial_txx9_mutex);
965 for (i = 0; i < UART_NR; i++) {
966 uart = &serial_txx9_ports[i];
967 if (uart_match_port(uart, port)) {
968 uart_remove_one_port(&serial_txx9_reg, uart);
969 break;
970 }
971 }
972 if (i == UART_NR) {
973 /* Find unused port */
974 for (i = 0; i < UART_NR; i++) {
975 uart = &serial_txx9_ports[i];
976 if (!(uart->iobase || uart->mapbase))
977 break;
978 }
979 }
980 if (i < UART_NR) {
981 uart->iobase = port->iobase;
982 uart->membase = port->membase;
983 uart->irq = port->irq;
984 uart->uartclk = port->uartclk;
985 uart->iotype = port->iotype;
986 uart->flags = port->flags
987 | UPF_BOOT_AUTOCONF | UPF_FIXED_PORT;
988 uart->mapbase = port->mapbase;
989 if (port->dev)
990 uart->dev = port->dev;
991 ret = uart_add_one_port(&serial_txx9_reg, uart);
992 if (ret == 0)
993 ret = uart->line;
994 }
995 mutex_unlock(&serial_txx9_mutex);
996 return ret;
997}
998
999/**
1000 * serial_txx9_unregister_port - remove a txx9 serial port at runtime
1001 * @line: serial line number
1002 *
1003 * Remove one serial port. This may not be called from interrupt
1004 * context. We hand the port back to the our control.
1005 */
1006static void serial_txx9_unregister_port(int line)
1007{
1008 struct uart_port *uart = &serial_txx9_ports[line];
1009
1010 mutex_lock(&serial_txx9_mutex);
1011 uart_remove_one_port(&serial_txx9_reg, uart);
1012 uart->flags = 0;
1013 uart->type = PORT_UNKNOWN;
1014 uart->iobase = 0;
1015 uart->mapbase = 0;
1016 uart->membase = NULL;
1017 uart->dev = NULL;
1018 mutex_unlock(&serial_txx9_mutex);
1019}
1020
1021/*
1022 * Register a set of serial devices attached to a platform device.
1023 */
1024static int serial_txx9_probe(struct platform_device *dev)
1025{
1026 struct uart_port *p = dev_get_platdata(&dev->dev);
1027 struct uart_port port;
1028 int ret, i;
1029
1030 memset(&port, 0, sizeof(struct uart_port));
1031 for (i = 0; p && p->uartclk != 0; p++, i++) {
1032 port.iobase = p->iobase;
1033 port.membase = p->membase;
1034 port.irq = p->irq;
1035 port.uartclk = p->uartclk;
1036 port.iotype = p->iotype;
1037 port.flags = p->flags;
1038 port.mapbase = p->mapbase;
1039 port.dev = &dev->dev;
1040 port.has_sysrq = IS_ENABLED(CONFIG_SERIAL_TXX9_CONSOLE);
1041 ret = serial_txx9_register_port(&port);
1042 if (ret < 0) {
1043 dev_err(&dev->dev, "unable to register port at index %d "
1044 "(IO%lx MEM%llx IRQ%d): %d\n", i,
1045 p->iobase, (unsigned long long)p->mapbase,
1046 p->irq, ret);
1047 }
1048 }
1049 return 0;
1050}
1051
1052/*
1053 * Remove serial ports registered against a platform device.
1054 */
1055static void serial_txx9_remove(struct platform_device *dev)
1056{
1057 int i;
1058
1059 for (i = 0; i < UART_NR; i++) {
1060 struct uart_port *up = &serial_txx9_ports[i];
1061
1062 if (up->dev == &dev->dev)
1063 serial_txx9_unregister_port(i);
1064 }
1065}
1066
1067#ifdef CONFIG_PM
1068static int serial_txx9_suspend(struct platform_device *dev, pm_message_t state)
1069{
1070 int i;
1071
1072 for (i = 0; i < UART_NR; i++) {
1073 struct uart_port *up = &serial_txx9_ports[i];
1074
1075 if (up->type != PORT_UNKNOWN && up->dev == &dev->dev)
1076 uart_suspend_port(&serial_txx9_reg, up);
1077 }
1078
1079 return 0;
1080}
1081
1082static int serial_txx9_resume(struct platform_device *dev)
1083{
1084 int i;
1085
1086 for (i = 0; i < UART_NR; i++) {
1087 struct uart_port *up = &serial_txx9_ports[i];
1088
1089 if (up->type != PORT_UNKNOWN && up->dev == &dev->dev)
1090 uart_resume_port(&serial_txx9_reg, up);
1091 }
1092
1093 return 0;
1094}
1095#endif
1096
1097static struct platform_driver serial_txx9_plat_driver = {
1098 .probe = serial_txx9_probe,
1099 .remove_new = serial_txx9_remove,
1100#ifdef CONFIG_PM
1101 .suspend = serial_txx9_suspend,
1102 .resume = serial_txx9_resume,
1103#endif
1104 .driver = {
1105 .name = "serial_txx9",
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 */
1114static int
1115pciserial_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
1144static void pciserial_txx9_remove_one(struct pci_dev *dev)
1145{
1146 struct uart_port *up = pci_get_drvdata(dev);
1147
1148 if (up) {
1149 serial_txx9_unregister_port(up->line);
1150 pci_disable_device(dev);
1151 }
1152}
1153
1154#ifdef CONFIG_PM
1155static int pciserial_txx9_suspend_one(struct pci_dev *dev, pm_message_t state)
1156{
1157 struct uart_port *up = pci_get_drvdata(dev);
1158
1159 if (up)
1160 uart_suspend_port(&serial_txx9_reg, up);
1161 pci_save_state(dev);
1162 pci_set_power_state(dev, pci_choose_state(dev, state));
1163 return 0;
1164}
1165
1166static int pciserial_txx9_resume_one(struct pci_dev *dev)
1167{
1168 struct uart_port *up = pci_get_drvdata(dev);
1169
1170 pci_set_power_state(dev, PCI_D0);
1171 pci_restore_state(dev);
1172 if (up)
1173 uart_resume_port(&serial_txx9_reg, up);
1174 return 0;
1175}
1176#endif
1177
1178static const struct pci_device_id serial_txx9_pci_tbl[] = {
1179 { PCI_DEVICE(PCI_VENDOR_ID_TOSHIBA_2, PCI_DEVICE_ID_TOSHIBA_TC86C001_MISC) },
1180 { 0, }
1181};
1182
1183static struct pci_driver serial_txx9_pci_driver = {
1184 .name = "serial_txx9",
1185 .probe = pciserial_txx9_init_one,
1186 .remove = pciserial_txx9_remove_one,
1187#ifdef CONFIG_PM
1188 .suspend = pciserial_txx9_suspend_one,
1189 .resume = pciserial_txx9_resume_one,
1190#endif
1191 .id_table = serial_txx9_pci_tbl,
1192};
1193
1194MODULE_DEVICE_TABLE(pci, serial_txx9_pci_tbl);
1195#endif /* ENABLE_SERIAL_TXX9_PCI */
1196
1197static struct platform_device *serial_txx9_plat_devs;
1198
1199static int __init serial_txx9_init(void)
1200{
1201 int ret;
1202
1203 ret = uart_register_driver(&serial_txx9_reg);
1204 if (ret)
1205 goto out;
1206
1207 serial_txx9_plat_devs = platform_device_alloc("serial_txx9", -1);
1208 if (!serial_txx9_plat_devs) {
1209 ret = -ENOMEM;
1210 goto unreg_uart_drv;
1211 }
1212
1213 ret = platform_device_add(serial_txx9_plat_devs);
1214 if (ret)
1215 goto put_dev;
1216
1217 serial_txx9_register_ports(&serial_txx9_reg,
1218 &serial_txx9_plat_devs->dev);
1219
1220 ret = platform_driver_register(&serial_txx9_plat_driver);
1221 if (ret)
1222 goto del_dev;
1223
1224#ifdef ENABLE_SERIAL_TXX9_PCI
1225 ret = pci_register_driver(&serial_txx9_pci_driver);
1226 if (ret) {
1227 platform_driver_unregister(&serial_txx9_plat_driver);
1228 }
1229#endif
1230 if (ret == 0)
1231 goto out;
1232
1233 del_dev:
1234 platform_device_del(serial_txx9_plat_devs);
1235 put_dev:
1236 platform_device_put(serial_txx9_plat_devs);
1237 unreg_uart_drv:
1238 uart_unregister_driver(&serial_txx9_reg);
1239 out:
1240 return ret;
1241}
1242
1243static void __exit serial_txx9_exit(void)
1244{
1245 int i;
1246
1247#ifdef ENABLE_SERIAL_TXX9_PCI
1248 pci_unregister_driver(&serial_txx9_pci_driver);
1249#endif
1250 platform_driver_unregister(&serial_txx9_plat_driver);
1251 platform_device_unregister(serial_txx9_plat_devs);
1252 for (i = 0; i < UART_NR; i++) {
1253 struct uart_port *up = &serial_txx9_ports[i];
1254 if (up->iobase || up->mapbase)
1255 uart_remove_one_port(&serial_txx9_reg, up);
1256 }
1257
1258 uart_unregister_driver(&serial_txx9_reg);
1259}
1260
1261module_init(serial_txx9_init);
1262module_exit(serial_txx9_exit);
1263
1264MODULE_LICENSE("GPL");
1265MODULE_DESCRIPTION("TX39/49 serial driver");
1266
1267MODULE_ALIAS_CHARDEV_MAJOR(TXX9_TTY_MAJOR);
1/*
2 * Derived from many drivers using generic_serial interface,
3 * especially serial_tx3912.c by Steven J. Hill and r39xx_serial.c
4 * (was in Linux/VR tree) by Jim Pick.
5 *
6 * Copyright (C) 1999 Harald Koerfgen
7 * Copyright (C) 2000 Jim Pick <jim@jimpick.com>
8 * Copyright (C) 2001 Steven J. Hill (sjhill@realitydiluted.com)
9 * Copyright (C) 2000-2002 Toshiba Corporation
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License version 2 as
13 * published by the Free Software Foundation.
14 *
15 * Serial driver for TX3927/TX4927/TX4925/TX4938 internal SIO controller
16 */
17
18#if defined(CONFIG_SERIAL_TXX9_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
19#define SUPPORT_SYSRQ
20#endif
21
22#include <linux/module.h>
23#include <linux/ioport.h>
24#include <linux/init.h>
25#include <linux/console.h>
26#include <linux/delay.h>
27#include <linux/platform_device.h>
28#include <linux/pci.h>
29#include <linux/serial_core.h>
30#include <linux/serial.h>
31#include <linux/tty.h>
32#include <linux/tty_flip.h>
33
34#include <asm/io.h>
35
36static char *serial_version = "1.11";
37static 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
67struct 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
174static 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
184static inline void
185sio_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
197static inline void
198sio_mask(struct uart_txx9_port *up, int offset, unsigned int value)
199{
200 sio_out(up, offset, sio_in(up, offset) & ~value);
201}
202static inline void
203sio_set(struct uart_txx9_port *up, int offset, unsigned int value)
204{
205 sio_out(up, offset, sio_in(up, offset) | value);
206}
207
208static inline void
209sio_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
224static struct uart_txx9_port *to_uart_txx9_port(struct uart_port *port)
225{
226 return container_of(port, struct uart_txx9_port, port);
227}
228
229static void serial_txx9_stop_tx(struct uart_port *port)
230{
231 struct uart_txx9_port *up = to_uart_txx9_port(port);
232 sio_mask(up, TXX9_SIDICR, TXX9_SIDICR_TIE);
233}
234
235static void serial_txx9_start_tx(struct uart_port *port)
236{
237 struct uart_txx9_port *up = to_uart_txx9_port(port);
238 sio_set(up, TXX9_SIDICR, TXX9_SIDICR_TIE);
239}
240
241static void serial_txx9_stop_rx(struct uart_port *port)
242{
243 struct uart_txx9_port *up = to_uart_txx9_port(port);
244 up->port.read_status_mask &= ~TXX9_SIDISR_RDIS;
245}
246
247static void serial_txx9_enable_ms(struct uart_port *port)
248{
249 /* TXX9-SIO can not control DTR... */
250}
251
252static void serial_txx9_initialize(struct uart_port *port)
253{
254 struct uart_txx9_port *up = to_uart_txx9_port(port);
255 unsigned int tmout = 10000;
256
257 sio_out(up, TXX9_SIFCR, TXX9_SIFCR_SWRST);
258 /* TX4925 BUG WORKAROUND. Accessing SIOC register
259 * immediately after soft reset causes bus error. */
260 mmiowb();
261 udelay(1);
262 while ((sio_in(up, TXX9_SIFCR) & TXX9_SIFCR_SWRST) && --tmout)
263 udelay(1);
264 /* TX Int by FIFO Empty, RX Int by Receiving 1 char. */
265 sio_set(up, TXX9_SIFCR,
266 TXX9_SIFCR_TDIL_MAX | TXX9_SIFCR_RDIL_1);
267 /* initial settings */
268 sio_out(up, TXX9_SILCR,
269 TXX9_SILCR_UMODE_8BIT | TXX9_SILCR_USBL_1BIT |
270 ((up->port.flags & UPF_TXX9_USE_SCLK) ?
271 TXX9_SILCR_SCS_SCLK_BG : TXX9_SILCR_SCS_IMCLK_BG));
272 sio_quot_set(up, uart_get_divisor(port, 9600));
273 sio_out(up, TXX9_SIFLCR, TXX9_SIFLCR_RTSTL_MAX /* 15 */);
274 sio_out(up, TXX9_SIDICR, 0);
275}
276
277static inline void
278receive_chars(struct uart_txx9_port *up, unsigned int *status)
279{
280 unsigned char ch;
281 unsigned int disr = *status;
282 int max_count = 256;
283 char flag;
284 unsigned int next_ignore_status_mask;
285
286 do {
287 ch = sio_in(up, TXX9_SIRFIFO);
288 flag = TTY_NORMAL;
289 up->port.icount.rx++;
290
291 /* mask out RFDN_MASK bit added by previous overrun */
292 next_ignore_status_mask =
293 up->port.ignore_status_mask & ~TXX9_SIDISR_RFDN_MASK;
294 if (unlikely(disr & (TXX9_SIDISR_UBRK | TXX9_SIDISR_UPER |
295 TXX9_SIDISR_UFER | TXX9_SIDISR_UOER))) {
296 /*
297 * For statistics only
298 */
299 if (disr & TXX9_SIDISR_UBRK) {
300 disr &= ~(TXX9_SIDISR_UFER | TXX9_SIDISR_UPER);
301 up->port.icount.brk++;
302 /*
303 * We do the SysRQ and SAK checking
304 * here because otherwise the break
305 * may get masked by ignore_status_mask
306 * or read_status_mask.
307 */
308 if (uart_handle_break(&up->port))
309 goto ignore_char;
310 } else if (disr & TXX9_SIDISR_UPER)
311 up->port.icount.parity++;
312 else if (disr & TXX9_SIDISR_UFER)
313 up->port.icount.frame++;
314 if (disr & TXX9_SIDISR_UOER) {
315 up->port.icount.overrun++;
316 /*
317 * The receiver read buffer still hold
318 * a char which caused overrun.
319 * Ignore next char by adding RFDN_MASK
320 * to ignore_status_mask temporarily.
321 */
322 next_ignore_status_mask |=
323 TXX9_SIDISR_RFDN_MASK;
324 }
325
326 /*
327 * Mask off conditions which should be ingored.
328 */
329 disr &= up->port.read_status_mask;
330
331 if (disr & TXX9_SIDISR_UBRK) {
332 flag = TTY_BREAK;
333 } else if (disr & TXX9_SIDISR_UPER)
334 flag = TTY_PARITY;
335 else if (disr & TXX9_SIDISR_UFER)
336 flag = TTY_FRAME;
337 }
338 if (uart_handle_sysrq_char(&up->port, ch))
339 goto ignore_char;
340
341 uart_insert_char(&up->port, disr, TXX9_SIDISR_UOER, ch, flag);
342
343 ignore_char:
344 up->port.ignore_status_mask = next_ignore_status_mask;
345 disr = sio_in(up, TXX9_SIDISR);
346 } while (!(disr & TXX9_SIDISR_UVALID) && (max_count-- > 0));
347 spin_unlock(&up->port.lock);
348 tty_flip_buffer_push(&up->port.state->port);
349 spin_lock(&up->port.lock);
350 *status = disr;
351}
352
353static inline void transmit_chars(struct uart_txx9_port *up)
354{
355 struct circ_buf *xmit = &up->port.state->xmit;
356 int count;
357
358 if (up->port.x_char) {
359 sio_out(up, TXX9_SITFIFO, up->port.x_char);
360 up->port.icount.tx++;
361 up->port.x_char = 0;
362 return;
363 }
364 if (uart_circ_empty(xmit) || uart_tx_stopped(&up->port)) {
365 serial_txx9_stop_tx(&up->port);
366 return;
367 }
368
369 count = TXX9_SIO_TX_FIFO;
370 do {
371 sio_out(up, TXX9_SITFIFO, xmit->buf[xmit->tail]);
372 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
373 up->port.icount.tx++;
374 if (uart_circ_empty(xmit))
375 break;
376 } while (--count > 0);
377
378 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
379 uart_write_wakeup(&up->port);
380
381 if (uart_circ_empty(xmit))
382 serial_txx9_stop_tx(&up->port);
383}
384
385static irqreturn_t serial_txx9_interrupt(int irq, void *dev_id)
386{
387 int pass_counter = 0;
388 struct uart_txx9_port *up = dev_id;
389 unsigned int status;
390
391 while (1) {
392 spin_lock(&up->port.lock);
393 status = sio_in(up, TXX9_SIDISR);
394 if (!(sio_in(up, TXX9_SIDICR) & TXX9_SIDICR_TIE))
395 status &= ~TXX9_SIDISR_TDIS;
396 if (!(status & (TXX9_SIDISR_TDIS | TXX9_SIDISR_RDIS |
397 TXX9_SIDISR_TOUT))) {
398 spin_unlock(&up->port.lock);
399 break;
400 }
401
402 if (status & TXX9_SIDISR_RDIS)
403 receive_chars(up, &status);
404 if (status & TXX9_SIDISR_TDIS)
405 transmit_chars(up);
406 /* Clear TX/RX Int. Status */
407 sio_mask(up, TXX9_SIDISR,
408 TXX9_SIDISR_TDIS | TXX9_SIDISR_RDIS |
409 TXX9_SIDISR_TOUT);
410 spin_unlock(&up->port.lock);
411
412 if (pass_counter++ > PASS_LIMIT)
413 break;
414 }
415
416 return pass_counter ? IRQ_HANDLED : IRQ_NONE;
417}
418
419static unsigned int serial_txx9_tx_empty(struct uart_port *port)
420{
421 struct uart_txx9_port *up = to_uart_txx9_port(port);
422 unsigned long flags;
423 unsigned int ret;
424
425 spin_lock_irqsave(&up->port.lock, flags);
426 ret = (sio_in(up, TXX9_SICISR) & TXX9_SICISR_TXALS) ? TIOCSER_TEMT : 0;
427 spin_unlock_irqrestore(&up->port.lock, flags);
428
429 return ret;
430}
431
432static unsigned int serial_txx9_get_mctrl(struct uart_port *port)
433{
434 struct uart_txx9_port *up = to_uart_txx9_port(port);
435 unsigned int ret;
436
437 /* no modem control lines */
438 ret = TIOCM_CAR | TIOCM_DSR;
439 ret |= (sio_in(up, TXX9_SIFLCR) & TXX9_SIFLCR_RTSSC) ? 0 : TIOCM_RTS;
440 ret |= (sio_in(up, TXX9_SICISR) & TXX9_SICISR_CTSS) ? 0 : TIOCM_CTS;
441
442 return ret;
443}
444
445static void serial_txx9_set_mctrl(struct uart_port *port, unsigned int mctrl)
446{
447 struct uart_txx9_port *up = to_uart_txx9_port(port);
448
449 if (mctrl & TIOCM_RTS)
450 sio_mask(up, TXX9_SIFLCR, TXX9_SIFLCR_RTSSC);
451 else
452 sio_set(up, TXX9_SIFLCR, TXX9_SIFLCR_RTSSC);
453}
454
455static void serial_txx9_break_ctl(struct uart_port *port, int break_state)
456{
457 struct uart_txx9_port *up = to_uart_txx9_port(port);
458 unsigned long flags;
459
460 spin_lock_irqsave(&up->port.lock, flags);
461 if (break_state == -1)
462 sio_set(up, TXX9_SIFLCR, TXX9_SIFLCR_TBRK);
463 else
464 sio_mask(up, TXX9_SIFLCR, TXX9_SIFLCR_TBRK);
465 spin_unlock_irqrestore(&up->port.lock, flags);
466}
467
468#if defined(CONFIG_SERIAL_TXX9_CONSOLE) || defined(CONFIG_CONSOLE_POLL)
469/*
470 * Wait for transmitter & holding register to empty
471 */
472static void wait_for_xmitr(struct uart_txx9_port *up)
473{
474 unsigned int tmout = 10000;
475
476 /* Wait up to 10ms for the character(s) to be sent. */
477 while (--tmout &&
478 !(sio_in(up, TXX9_SICISR) & TXX9_SICISR_TXALS))
479 udelay(1);
480
481 /* Wait up to 1s for flow control if necessary */
482 if (up->port.flags & UPF_CONS_FLOW) {
483 tmout = 1000000;
484 while (--tmout &&
485 (sio_in(up, TXX9_SICISR) & TXX9_SICISR_CTSS))
486 udelay(1);
487 }
488}
489#endif
490
491#ifdef CONFIG_CONSOLE_POLL
492/*
493 * Console polling routines for writing and reading from the uart while
494 * in an interrupt or debug context.
495 */
496
497static int serial_txx9_get_poll_char(struct uart_port *port)
498{
499 unsigned int ier;
500 unsigned char c;
501 struct uart_txx9_port *up = to_uart_txx9_port(port);
502
503 /*
504 * First save the IER then disable the interrupts
505 */
506 ier = sio_in(up, TXX9_SIDICR);
507 sio_out(up, TXX9_SIDICR, 0);
508
509 while (sio_in(up, TXX9_SIDISR) & TXX9_SIDISR_UVALID)
510 ;
511
512 c = sio_in(up, TXX9_SIRFIFO);
513
514 /*
515 * Finally, clear RX interrupt status
516 * and restore the IER
517 */
518 sio_mask(up, TXX9_SIDISR, TXX9_SIDISR_RDIS);
519 sio_out(up, TXX9_SIDICR, ier);
520 return c;
521}
522
523
524static void serial_txx9_put_poll_char(struct uart_port *port, unsigned char c)
525{
526 unsigned int ier;
527 struct uart_txx9_port *up = to_uart_txx9_port(port);
528
529 /*
530 * First save the IER then disable the interrupts
531 */
532 ier = sio_in(up, TXX9_SIDICR);
533 sio_out(up, TXX9_SIDICR, 0);
534
535 wait_for_xmitr(up);
536 /*
537 * Send the character out.
538 * If a LF, also do CR...
539 */
540 sio_out(up, TXX9_SITFIFO, c);
541 if (c == 10) {
542 wait_for_xmitr(up);
543 sio_out(up, TXX9_SITFIFO, 13);
544 }
545
546 /*
547 * Finally, wait for transmitter to become empty
548 * and restore the IER
549 */
550 wait_for_xmitr(up);
551 sio_out(up, TXX9_SIDICR, ier);
552}
553
554#endif /* CONFIG_CONSOLE_POLL */
555
556static int serial_txx9_startup(struct uart_port *port)
557{
558 struct uart_txx9_port *up = to_uart_txx9_port(port);
559 unsigned long flags;
560 int retval;
561
562 /*
563 * Clear the FIFO buffers and disable them.
564 * (they will be reenabled in set_termios())
565 */
566 sio_set(up, TXX9_SIFCR,
567 TXX9_SIFCR_TFRST | TXX9_SIFCR_RFRST | TXX9_SIFCR_FRSTE);
568 /* clear reset */
569 sio_mask(up, TXX9_SIFCR,
570 TXX9_SIFCR_TFRST | TXX9_SIFCR_RFRST | TXX9_SIFCR_FRSTE);
571 sio_out(up, TXX9_SIDICR, 0);
572
573 /*
574 * Clear the interrupt registers.
575 */
576 sio_out(up, TXX9_SIDISR, 0);
577
578 retval = request_irq(up->port.irq, serial_txx9_interrupt,
579 IRQF_SHARED, "serial_txx9", up);
580 if (retval)
581 return retval;
582
583 /*
584 * Now, initialize the UART
585 */
586 spin_lock_irqsave(&up->port.lock, flags);
587 serial_txx9_set_mctrl(&up->port, up->port.mctrl);
588 spin_unlock_irqrestore(&up->port.lock, flags);
589
590 /* Enable RX/TX */
591 sio_mask(up, TXX9_SIFLCR, TXX9_SIFLCR_RSDE | TXX9_SIFLCR_TSDE);
592
593 /*
594 * Finally, enable interrupts.
595 */
596 sio_set(up, TXX9_SIDICR, TXX9_SIDICR_RIE);
597
598 return 0;
599}
600
601static void serial_txx9_shutdown(struct uart_port *port)
602{
603 struct uart_txx9_port *up = to_uart_txx9_port(port);
604 unsigned long flags;
605
606 /*
607 * Disable interrupts from this port
608 */
609 sio_out(up, TXX9_SIDICR, 0); /* disable all intrs */
610
611 spin_lock_irqsave(&up->port.lock, flags);
612 serial_txx9_set_mctrl(&up->port, up->port.mctrl);
613 spin_unlock_irqrestore(&up->port.lock, flags);
614
615 /*
616 * Disable break condition
617 */
618 sio_mask(up, TXX9_SIFLCR, TXX9_SIFLCR_TBRK);
619
620#ifdef CONFIG_SERIAL_TXX9_CONSOLE
621 if (up->port.cons && up->port.line == up->port.cons->index) {
622 free_irq(up->port.irq, up);
623 return;
624 }
625#endif
626 /* reset FIFOs */
627 sio_set(up, TXX9_SIFCR,
628 TXX9_SIFCR_TFRST | TXX9_SIFCR_RFRST | TXX9_SIFCR_FRSTE);
629 /* clear reset */
630 sio_mask(up, TXX9_SIFCR,
631 TXX9_SIFCR_TFRST | TXX9_SIFCR_RFRST | TXX9_SIFCR_FRSTE);
632
633 /* Disable RX/TX */
634 sio_set(up, TXX9_SIFLCR, TXX9_SIFLCR_RSDE | TXX9_SIFLCR_TSDE);
635
636 free_irq(up->port.irq, up);
637}
638
639static void
640serial_txx9_set_termios(struct uart_port *port, struct ktermios *termios,
641 struct ktermios *old)
642{
643 struct uart_txx9_port *up = to_uart_txx9_port(port);
644 unsigned int cval, fcr = 0;
645 unsigned long flags;
646 unsigned int baud, quot;
647
648 /*
649 * We don't support modem control lines.
650 */
651 termios->c_cflag &= ~(HUPCL | CMSPAR);
652 termios->c_cflag |= CLOCAL;
653
654 cval = sio_in(up, TXX9_SILCR);
655 /* byte size and parity */
656 cval &= ~TXX9_SILCR_UMODE_MASK;
657 switch (termios->c_cflag & CSIZE) {
658 case CS7:
659 cval |= TXX9_SILCR_UMODE_7BIT;
660 break;
661 default:
662 case CS5: /* not supported */
663 case CS6: /* not supported */
664 case CS8:
665 cval |= TXX9_SILCR_UMODE_8BIT;
666 break;
667 }
668
669 cval &= ~TXX9_SILCR_USBL_MASK;
670 if (termios->c_cflag & CSTOPB)
671 cval |= TXX9_SILCR_USBL_2BIT;
672 else
673 cval |= TXX9_SILCR_USBL_1BIT;
674 cval &= ~(TXX9_SILCR_UPEN | TXX9_SILCR_UEPS);
675 if (termios->c_cflag & PARENB)
676 cval |= TXX9_SILCR_UPEN;
677 if (!(termios->c_cflag & PARODD))
678 cval |= TXX9_SILCR_UEPS;
679
680 /*
681 * Ask the core to calculate the divisor for us.
682 */
683 baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16/2);
684 quot = uart_get_divisor(port, baud);
685
686 /* Set up FIFOs */
687 /* TX Int by FIFO Empty, RX Int by Receiving 1 char. */
688 fcr = TXX9_SIFCR_TDIL_MAX | TXX9_SIFCR_RDIL_1;
689
690 /*
691 * Ok, we're now changing the port state. Do it with
692 * interrupts disabled.
693 */
694 spin_lock_irqsave(&up->port.lock, flags);
695
696 /*
697 * Update the per-port timeout.
698 */
699 uart_update_timeout(port, termios->c_cflag, baud);
700
701 up->port.read_status_mask = TXX9_SIDISR_UOER |
702 TXX9_SIDISR_TDIS | TXX9_SIDISR_RDIS;
703 if (termios->c_iflag & INPCK)
704 up->port.read_status_mask |= TXX9_SIDISR_UFER | TXX9_SIDISR_UPER;
705 if (termios->c_iflag & (BRKINT | PARMRK))
706 up->port.read_status_mask |= TXX9_SIDISR_UBRK;
707
708 /*
709 * Characteres to ignore
710 */
711 up->port.ignore_status_mask = 0;
712 if (termios->c_iflag & IGNPAR)
713 up->port.ignore_status_mask |= TXX9_SIDISR_UPER | TXX9_SIDISR_UFER;
714 if (termios->c_iflag & IGNBRK) {
715 up->port.ignore_status_mask |= TXX9_SIDISR_UBRK;
716 /*
717 * If we're ignoring parity and break indicators,
718 * ignore overruns too (for real raw support).
719 */
720 if (termios->c_iflag & IGNPAR)
721 up->port.ignore_status_mask |= TXX9_SIDISR_UOER;
722 }
723
724 /*
725 * ignore all characters if CREAD is not set
726 */
727 if ((termios->c_cflag & CREAD) == 0)
728 up->port.ignore_status_mask |= TXX9_SIDISR_RDIS;
729
730 /* CTS flow control flag */
731 if ((termios->c_cflag & CRTSCTS) &&
732 (up->port.flags & UPF_TXX9_HAVE_CTS_LINE)) {
733 sio_set(up, TXX9_SIFLCR,
734 TXX9_SIFLCR_RCS | TXX9_SIFLCR_TES);
735 } else {
736 sio_mask(up, TXX9_SIFLCR,
737 TXX9_SIFLCR_RCS | TXX9_SIFLCR_TES);
738 }
739
740 sio_out(up, TXX9_SILCR, cval);
741 sio_quot_set(up, quot);
742 sio_out(up, TXX9_SIFCR, fcr);
743
744 serial_txx9_set_mctrl(&up->port, up->port.mctrl);
745 spin_unlock_irqrestore(&up->port.lock, flags);
746}
747
748static void
749serial_txx9_pm(struct uart_port *port, unsigned int state,
750 unsigned int oldstate)
751{
752 /*
753 * If oldstate was -1 this is called from
754 * uart_configure_port(). In this case do not initialize the
755 * port now, because the port was already initialized (for
756 * non-console port) or should not be initialized here (for
757 * console port). If we initialized the port here we lose
758 * serial console settings.
759 */
760 if (state == 0 && oldstate != -1)
761 serial_txx9_initialize(port);
762}
763
764static int serial_txx9_request_resource(struct uart_txx9_port *up)
765{
766 unsigned int size = TXX9_REGION_SIZE;
767 int ret = 0;
768
769 switch (up->port.iotype) {
770 default:
771 if (!up->port.mapbase)
772 break;
773
774 if (!request_mem_region(up->port.mapbase, size, "serial_txx9")) {
775 ret = -EBUSY;
776 break;
777 }
778
779 if (up->port.flags & UPF_IOREMAP) {
780 up->port.membase = ioremap(up->port.mapbase, size);
781 if (!up->port.membase) {
782 release_mem_region(up->port.mapbase, size);
783 ret = -ENOMEM;
784 }
785 }
786 break;
787
788 case UPIO_PORT:
789 if (!request_region(up->port.iobase, size, "serial_txx9"))
790 ret = -EBUSY;
791 break;
792 }
793 return ret;
794}
795
796static void serial_txx9_release_resource(struct uart_txx9_port *up)
797{
798 unsigned int size = TXX9_REGION_SIZE;
799
800 switch (up->port.iotype) {
801 default:
802 if (!up->port.mapbase)
803 break;
804
805 if (up->port.flags & UPF_IOREMAP) {
806 iounmap(up->port.membase);
807 up->port.membase = NULL;
808 }
809
810 release_mem_region(up->port.mapbase, size);
811 break;
812
813 case UPIO_PORT:
814 release_region(up->port.iobase, size);
815 break;
816 }
817}
818
819static void serial_txx9_release_port(struct uart_port *port)
820{
821 struct uart_txx9_port *up = to_uart_txx9_port(port);
822 serial_txx9_release_resource(up);
823}
824
825static int serial_txx9_request_port(struct uart_port *port)
826{
827 struct uart_txx9_port *up = to_uart_txx9_port(port);
828 return serial_txx9_request_resource(up);
829}
830
831static void serial_txx9_config_port(struct uart_port *port, int uflags)
832{
833 struct uart_txx9_port *up = to_uart_txx9_port(port);
834 int ret;
835
836 /*
837 * Find the region that we can probe for. This in turn
838 * tells us whether we can probe for the type of port.
839 */
840 ret = serial_txx9_request_resource(up);
841 if (ret < 0)
842 return;
843 port->type = PORT_TXX9;
844 up->port.fifosize = TXX9_SIO_TX_FIFO;
845
846#ifdef CONFIG_SERIAL_TXX9_CONSOLE
847 if (up->port.line == up->port.cons->index)
848 return;
849#endif
850 serial_txx9_initialize(port);
851}
852
853static const char *
854serial_txx9_type(struct uart_port *port)
855{
856 return "txx9";
857}
858
859static struct uart_ops serial_txx9_pops = {
860 .tx_empty = serial_txx9_tx_empty,
861 .set_mctrl = serial_txx9_set_mctrl,
862 .get_mctrl = serial_txx9_get_mctrl,
863 .stop_tx = serial_txx9_stop_tx,
864 .start_tx = serial_txx9_start_tx,
865 .stop_rx = serial_txx9_stop_rx,
866 .enable_ms = serial_txx9_enable_ms,
867 .break_ctl = serial_txx9_break_ctl,
868 .startup = serial_txx9_startup,
869 .shutdown = serial_txx9_shutdown,
870 .set_termios = serial_txx9_set_termios,
871 .pm = serial_txx9_pm,
872 .type = serial_txx9_type,
873 .release_port = serial_txx9_release_port,
874 .request_port = serial_txx9_request_port,
875 .config_port = serial_txx9_config_port,
876#ifdef CONFIG_CONSOLE_POLL
877 .poll_get_char = serial_txx9_get_poll_char,
878 .poll_put_char = serial_txx9_put_poll_char,
879#endif
880};
881
882static struct uart_txx9_port serial_txx9_ports[UART_NR];
883
884static void __init serial_txx9_register_ports(struct uart_driver *drv,
885 struct device *dev)
886{
887 int i;
888
889 for (i = 0; i < UART_NR; i++) {
890 struct uart_txx9_port *up = &serial_txx9_ports[i];
891
892 up->port.line = i;
893 up->port.ops = &serial_txx9_pops;
894 up->port.dev = dev;
895 if (up->port.iobase || up->port.mapbase)
896 uart_add_one_port(drv, &up->port);
897 }
898}
899
900#ifdef CONFIG_SERIAL_TXX9_CONSOLE
901
902static void serial_txx9_console_putchar(struct uart_port *port, int ch)
903{
904 struct uart_txx9_port *up = to_uart_txx9_port(port);
905
906 wait_for_xmitr(up);
907 sio_out(up, TXX9_SITFIFO, ch);
908}
909
910/*
911 * Print a string to the serial port trying not to disturb
912 * any possible real use of the port...
913 *
914 * The console_lock must be held when we get here.
915 */
916static void
917serial_txx9_console_write(struct console *co, const char *s, unsigned int count)
918{
919 struct uart_txx9_port *up = &serial_txx9_ports[co->index];
920 unsigned int ier, flcr;
921
922 /*
923 * First save the UER then disable the interrupts
924 */
925 ier = sio_in(up, TXX9_SIDICR);
926 sio_out(up, TXX9_SIDICR, 0);
927 /*
928 * Disable flow-control if enabled (and unnecessary)
929 */
930 flcr = sio_in(up, TXX9_SIFLCR);
931 if (!(up->port.flags & UPF_CONS_FLOW) && (flcr & TXX9_SIFLCR_TES))
932 sio_out(up, TXX9_SIFLCR, flcr & ~TXX9_SIFLCR_TES);
933
934 uart_console_write(&up->port, s, count, serial_txx9_console_putchar);
935
936 /*
937 * Finally, wait for transmitter to become empty
938 * and restore the IER
939 */
940 wait_for_xmitr(up);
941 sio_out(up, TXX9_SIFLCR, flcr);
942 sio_out(up, TXX9_SIDICR, ier);
943}
944
945static int __init serial_txx9_console_setup(struct console *co, char *options)
946{
947 struct uart_port *port;
948 struct uart_txx9_port *up;
949 int baud = 9600;
950 int bits = 8;
951 int parity = 'n';
952 int flow = 'n';
953
954 /*
955 * Check whether an invalid uart number has been specified, and
956 * if so, search for the first available port that does have
957 * console support.
958 */
959 if (co->index >= UART_NR)
960 co->index = 0;
961 up = &serial_txx9_ports[co->index];
962 port = &up->port;
963 if (!port->ops)
964 return -ENODEV;
965
966 serial_txx9_initialize(&up->port);
967
968 if (options)
969 uart_parse_options(options, &baud, &parity, &bits, &flow);
970
971 return uart_set_options(port, co, baud, parity, bits, flow);
972}
973
974static struct uart_driver serial_txx9_reg;
975static struct console serial_txx9_console = {
976 .name = TXX9_TTY_NAME,
977 .write = serial_txx9_console_write,
978 .device = uart_console_device,
979 .setup = serial_txx9_console_setup,
980 .flags = CON_PRINTBUFFER,
981 .index = -1,
982 .data = &serial_txx9_reg,
983};
984
985static int __init serial_txx9_console_init(void)
986{
987 register_console(&serial_txx9_console);
988 return 0;
989}
990console_initcall(serial_txx9_console_init);
991
992#define SERIAL_TXX9_CONSOLE &serial_txx9_console
993#else
994#define SERIAL_TXX9_CONSOLE NULL
995#endif
996
997static struct uart_driver serial_txx9_reg = {
998 .owner = THIS_MODULE,
999 .driver_name = "serial_txx9",
1000 .dev_name = TXX9_TTY_NAME,
1001 .major = TXX9_TTY_MAJOR,
1002 .minor = TXX9_TTY_MINOR_START,
1003 .nr = UART_NR,
1004 .cons = SERIAL_TXX9_CONSOLE,
1005};
1006
1007int __init early_serial_txx9_setup(struct uart_port *port)
1008{
1009 if (port->line >= ARRAY_SIZE(serial_txx9_ports))
1010 return -ENODEV;
1011
1012 serial_txx9_ports[port->line].port = *port;
1013 serial_txx9_ports[port->line].port.ops = &serial_txx9_pops;
1014 serial_txx9_ports[port->line].port.flags |=
1015 UPF_BOOT_AUTOCONF | UPF_FIXED_PORT;
1016 return 0;
1017}
1018
1019static DEFINE_MUTEX(serial_txx9_mutex);
1020
1021/**
1022 * serial_txx9_register_port - register a serial port
1023 * @port: serial port template
1024 *
1025 * Configure the serial port specified by the request.
1026 *
1027 * The port is then probed and if necessary the IRQ is autodetected
1028 * If this fails an error is returned.
1029 *
1030 * On success the port is ready to use and the line number is returned.
1031 */
1032static int serial_txx9_register_port(struct uart_port *port)
1033{
1034 int i;
1035 struct uart_txx9_port *uart;
1036 int ret = -ENOSPC;
1037
1038 mutex_lock(&serial_txx9_mutex);
1039 for (i = 0; i < UART_NR; i++) {
1040 uart = &serial_txx9_ports[i];
1041 if (uart_match_port(&uart->port, port)) {
1042 uart_remove_one_port(&serial_txx9_reg, &uart->port);
1043 break;
1044 }
1045 }
1046 if (i == UART_NR) {
1047 /* Find unused port */
1048 for (i = 0; i < UART_NR; i++) {
1049 uart = &serial_txx9_ports[i];
1050 if (!(uart->port.iobase || uart->port.mapbase))
1051 break;
1052 }
1053 }
1054 if (i < UART_NR) {
1055 uart->port.iobase = port->iobase;
1056 uart->port.membase = port->membase;
1057 uart->port.irq = port->irq;
1058 uart->port.uartclk = port->uartclk;
1059 uart->port.iotype = port->iotype;
1060 uart->port.flags = port->flags
1061 | UPF_BOOT_AUTOCONF | UPF_FIXED_PORT;
1062 uart->port.mapbase = port->mapbase;
1063 if (port->dev)
1064 uart->port.dev = port->dev;
1065 ret = uart_add_one_port(&serial_txx9_reg, &uart->port);
1066 if (ret == 0)
1067 ret = uart->port.line;
1068 }
1069 mutex_unlock(&serial_txx9_mutex);
1070 return ret;
1071}
1072
1073/**
1074 * serial_txx9_unregister_port - remove a txx9 serial port at runtime
1075 * @line: serial line number
1076 *
1077 * Remove one serial port. This may not be called from interrupt
1078 * context. We hand the port back to the our control.
1079 */
1080static void serial_txx9_unregister_port(int line)
1081{
1082 struct uart_txx9_port *uart = &serial_txx9_ports[line];
1083
1084 mutex_lock(&serial_txx9_mutex);
1085 uart_remove_one_port(&serial_txx9_reg, &uart->port);
1086 uart->port.flags = 0;
1087 uart->port.type = PORT_UNKNOWN;
1088 uart->port.iobase = 0;
1089 uart->port.mapbase = 0;
1090 uart->port.membase = NULL;
1091 uart->port.dev = NULL;
1092 mutex_unlock(&serial_txx9_mutex);
1093}
1094
1095/*
1096 * Register a set of serial devices attached to a platform device.
1097 */
1098static int serial_txx9_probe(struct platform_device *dev)
1099{
1100 struct uart_port *p = dev_get_platdata(&dev->dev);
1101 struct uart_port port;
1102 int ret, i;
1103
1104 memset(&port, 0, sizeof(struct uart_port));
1105 for (i = 0; p && p->uartclk != 0; p++, i++) {
1106 port.iobase = p->iobase;
1107 port.membase = p->membase;
1108 port.irq = p->irq;
1109 port.uartclk = p->uartclk;
1110 port.iotype = p->iotype;
1111 port.flags = p->flags;
1112 port.mapbase = p->mapbase;
1113 port.dev = &dev->dev;
1114 ret = serial_txx9_register_port(&port);
1115 if (ret < 0) {
1116 dev_err(&dev->dev, "unable to register port at index %d "
1117 "(IO%lx MEM%llx IRQ%d): %d\n", i,
1118 p->iobase, (unsigned long long)p->mapbase,
1119 p->irq, ret);
1120 }
1121 }
1122 return 0;
1123}
1124
1125/*
1126 * Remove serial ports registered against a platform device.
1127 */
1128static int serial_txx9_remove(struct platform_device *dev)
1129{
1130 int i;
1131
1132 for (i = 0; i < UART_NR; i++) {
1133 struct uart_txx9_port *up = &serial_txx9_ports[i];
1134
1135 if (up->port.dev == &dev->dev)
1136 serial_txx9_unregister_port(i);
1137 }
1138 return 0;
1139}
1140
1141#ifdef CONFIG_PM
1142static int serial_txx9_suspend(struct platform_device *dev, pm_message_t state)
1143{
1144 int i;
1145
1146 for (i = 0; i < UART_NR; i++) {
1147 struct uart_txx9_port *up = &serial_txx9_ports[i];
1148
1149 if (up->port.type != PORT_UNKNOWN && up->port.dev == &dev->dev)
1150 uart_suspend_port(&serial_txx9_reg, &up->port);
1151 }
1152
1153 return 0;
1154}
1155
1156static int serial_txx9_resume(struct platform_device *dev)
1157{
1158 int i;
1159
1160 for (i = 0; i < UART_NR; i++) {
1161 struct uart_txx9_port *up = &serial_txx9_ports[i];
1162
1163 if (up->port.type != PORT_UNKNOWN && up->port.dev == &dev->dev)
1164 uart_resume_port(&serial_txx9_reg, &up->port);
1165 }
1166
1167 return 0;
1168}
1169#endif
1170
1171static struct platform_driver serial_txx9_plat_driver = {
1172 .probe = serial_txx9_probe,
1173 .remove = serial_txx9_remove,
1174#ifdef CONFIG_PM
1175 .suspend = serial_txx9_suspend,
1176 .resume = serial_txx9_resume,
1177#endif
1178 .driver = {
1179 .name = "serial_txx9",
1180 .owner = THIS_MODULE,
1181 },
1182};
1183
1184#ifdef ENABLE_SERIAL_TXX9_PCI
1185/*
1186 * Probe one serial board. Unfortunately, there is no rhyme nor reason
1187 * to the arrangement of serial ports on a PCI card.
1188 */
1189static int
1190pciserial_txx9_init_one(struct pci_dev *dev, const struct pci_device_id *ent)
1191{
1192 struct uart_port port;
1193 int line;
1194 int rc;
1195
1196 rc = pci_enable_device(dev);
1197 if (rc)
1198 return rc;
1199
1200 memset(&port, 0, sizeof(port));
1201 port.ops = &serial_txx9_pops;
1202 port.flags |= UPF_TXX9_HAVE_CTS_LINE;
1203 port.uartclk = 66670000;
1204 port.irq = dev->irq;
1205 port.iotype = UPIO_PORT;
1206 port.iobase = pci_resource_start(dev, 1);
1207 port.dev = &dev->dev;
1208 line = serial_txx9_register_port(&port);
1209 if (line < 0) {
1210 printk(KERN_WARNING "Couldn't register serial port %s: %d\n", pci_name(dev), line);
1211 pci_disable_device(dev);
1212 return line;
1213 }
1214 pci_set_drvdata(dev, &serial_txx9_ports[line]);
1215
1216 return 0;
1217}
1218
1219static void pciserial_txx9_remove_one(struct pci_dev *dev)
1220{
1221 struct uart_txx9_port *up = pci_get_drvdata(dev);
1222
1223 if (up) {
1224 serial_txx9_unregister_port(up->port.line);
1225 pci_disable_device(dev);
1226 }
1227}
1228
1229#ifdef CONFIG_PM
1230static int pciserial_txx9_suspend_one(struct pci_dev *dev, pm_message_t state)
1231{
1232 struct uart_txx9_port *up = pci_get_drvdata(dev);
1233
1234 if (up)
1235 uart_suspend_port(&serial_txx9_reg, &up->port);
1236 pci_save_state(dev);
1237 pci_set_power_state(dev, pci_choose_state(dev, state));
1238 return 0;
1239}
1240
1241static int pciserial_txx9_resume_one(struct pci_dev *dev)
1242{
1243 struct uart_txx9_port *up = pci_get_drvdata(dev);
1244
1245 pci_set_power_state(dev, PCI_D0);
1246 pci_restore_state(dev);
1247 if (up)
1248 uart_resume_port(&serial_txx9_reg, &up->port);
1249 return 0;
1250}
1251#endif
1252
1253static const struct pci_device_id serial_txx9_pci_tbl[] = {
1254 { PCI_DEVICE(PCI_VENDOR_ID_TOSHIBA_2, PCI_DEVICE_ID_TOSHIBA_TC86C001_MISC) },
1255 { 0, }
1256};
1257
1258static struct pci_driver serial_txx9_pci_driver = {
1259 .name = "serial_txx9",
1260 .probe = pciserial_txx9_init_one,
1261 .remove = pciserial_txx9_remove_one,
1262#ifdef CONFIG_PM
1263 .suspend = pciserial_txx9_suspend_one,
1264 .resume = pciserial_txx9_resume_one,
1265#endif
1266 .id_table = serial_txx9_pci_tbl,
1267};
1268
1269MODULE_DEVICE_TABLE(pci, serial_txx9_pci_tbl);
1270#endif /* ENABLE_SERIAL_TXX9_PCI */
1271
1272static struct platform_device *serial_txx9_plat_devs;
1273
1274static int __init serial_txx9_init(void)
1275{
1276 int ret;
1277
1278 printk(KERN_INFO "%s version %s\n", serial_name, serial_version);
1279
1280 ret = uart_register_driver(&serial_txx9_reg);
1281 if (ret)
1282 goto out;
1283
1284 serial_txx9_plat_devs = platform_device_alloc("serial_txx9", -1);
1285 if (!serial_txx9_plat_devs) {
1286 ret = -ENOMEM;
1287 goto unreg_uart_drv;
1288 }
1289
1290 ret = platform_device_add(serial_txx9_plat_devs);
1291 if (ret)
1292 goto put_dev;
1293
1294 serial_txx9_register_ports(&serial_txx9_reg,
1295 &serial_txx9_plat_devs->dev);
1296
1297 ret = platform_driver_register(&serial_txx9_plat_driver);
1298 if (ret)
1299 goto del_dev;
1300
1301#ifdef ENABLE_SERIAL_TXX9_PCI
1302 ret = pci_register_driver(&serial_txx9_pci_driver);
1303#endif
1304 if (ret == 0)
1305 goto out;
1306
1307 del_dev:
1308 platform_device_del(serial_txx9_plat_devs);
1309 put_dev:
1310 platform_device_put(serial_txx9_plat_devs);
1311 unreg_uart_drv:
1312 uart_unregister_driver(&serial_txx9_reg);
1313 out:
1314 return ret;
1315}
1316
1317static void __exit serial_txx9_exit(void)
1318{
1319 int i;
1320
1321#ifdef ENABLE_SERIAL_TXX9_PCI
1322 pci_unregister_driver(&serial_txx9_pci_driver);
1323#endif
1324 platform_driver_unregister(&serial_txx9_plat_driver);
1325 platform_device_unregister(serial_txx9_plat_devs);
1326 for (i = 0; i < UART_NR; i++) {
1327 struct uart_txx9_port *up = &serial_txx9_ports[i];
1328 if (up->port.iobase || up->port.mapbase)
1329 uart_remove_one_port(&serial_txx9_reg, &up->port);
1330 }
1331
1332 uart_unregister_driver(&serial_txx9_reg);
1333}
1334
1335module_init(serial_txx9_init);
1336module_exit(serial_txx9_exit);
1337
1338MODULE_LICENSE("GPL");
1339MODULE_DESCRIPTION("TX39/49 serial driver");
1340
1341MODULE_ALIAS_CHARDEV_MAJOR(TXX9_TTY_MAJOR);