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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// 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 char ch;
250 unsigned int disr = *status;
251 int max_count = 256;
252 char flag;
253 unsigned int next_ignore_status_mask;
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
322static 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
332static 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 spin_lock(&up->lock);
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 spin_unlock(&up->lock);
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 spin_unlock(&up->lock);
358
359 if (pass_counter++ > PASS_LIMIT)
360 break;
361 }
362
363 return pass_counter ? IRQ_HANDLED : IRQ_NONE;
364}
365
366static unsigned int serial_txx9_tx_empty(struct uart_port *up)
367{
368 unsigned long flags;
369 unsigned int ret;
370
371 spin_lock_irqsave(&up->lock, flags);
372 ret = (sio_in(up, TXX9_SICISR) & TXX9_SICISR_TXALS) ? TIOCSER_TEMT : 0;
373 spin_unlock_irqrestore(&up->lock, flags);
374
375 return ret;
376}
377
378static 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
390static 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
399static void serial_txx9_break_ctl(struct uart_port *up, int break_state)
400{
401 unsigned long flags;
402
403 spin_lock_irqsave(&up->lock, 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 spin_unlock_irqrestore(&up->lock, flags);
409}
410
411#if defined(CONFIG_SERIAL_TXX9_CONSOLE) || defined(CONFIG_CONSOLE_POLL)
412/*
413 * Wait for transmitter & holding register to empty
414 */
415static 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
440static 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
466static 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
492static 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 spin_lock_irqsave(&up->lock, flags);
522 serial_txx9_set_mctrl(up, up->mctrl);
523 spin_unlock_irqrestore(&up->lock, 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
536static 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 spin_lock_irqsave(&up->lock, flags);
546 serial_txx9_set_mctrl(up, up->mctrl);
547 spin_unlock_irqrestore(&up->lock, 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
573static void
574serial_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 spin_lock_irqsave(&up->lock, 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 spin_unlock_irqrestore(&up->lock, flags);
681}
682
683static void
684serial_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
699static 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
731static 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
754static void serial_txx9_release_port(struct uart_port *up)
755{
756 serial_txx9_release_resource(up);
757}
758
759static int serial_txx9_request_port(struct uart_port *up)
760{
761 return serial_txx9_request_resource(up);
762}
763
764static 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
785static const char *
786serial_txx9_type(struct uart_port *port)
787{
788 return "txx9";
789}
790
791static 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
813static struct uart_port serial_txx9_ports[UART_NR];
814
815static 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
833static 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 */
845static void
846serial_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
874static 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
901static struct uart_driver serial_txx9_reg;
902static 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
912static int __init serial_txx9_console_init(void)
913{
914 register_console(&serial_txx9_console);
915 return 0;
916}
917console_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
924static 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
934int __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
946static 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 */
959static 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 */
1007static 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 */
1025static 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 */
1056static int 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 return 0;
1067}
1068
1069#ifdef CONFIG_PM
1070static int serial_txx9_suspend(struct platform_device *dev, pm_message_t state)
1071{
1072 int i;
1073
1074 for (i = 0; i < UART_NR; i++) {
1075 struct uart_port *up = &serial_txx9_ports[i];
1076
1077 if (up->type != PORT_UNKNOWN && up->dev == &dev->dev)
1078 uart_suspend_port(&serial_txx9_reg, up);
1079 }
1080
1081 return 0;
1082}
1083
1084static int serial_txx9_resume(struct platform_device *dev)
1085{
1086 int i;
1087
1088 for (i = 0; i < UART_NR; i++) {
1089 struct uart_port *up = &serial_txx9_ports[i];
1090
1091 if (up->type != PORT_UNKNOWN && up->dev == &dev->dev)
1092 uart_resume_port(&serial_txx9_reg, up);
1093 }
1094
1095 return 0;
1096}
1097#endif
1098
1099static struct platform_driver serial_txx9_plat_driver = {
1100 .probe = serial_txx9_probe,
1101 .remove = serial_txx9_remove,
1102#ifdef CONFIG_PM
1103 .suspend = serial_txx9_suspend,
1104 .resume = serial_txx9_resume,
1105#endif
1106 .driver = {
1107 .name = "serial_txx9",
1108 },
1109};
1110
1111#ifdef ENABLE_SERIAL_TXX9_PCI
1112/*
1113 * Probe one serial board. Unfortunately, there is no rhyme nor reason
1114 * to the arrangement of serial ports on a PCI card.
1115 */
1116static int
1117pciserial_txx9_init_one(struct pci_dev *dev, const struct pci_device_id *ent)
1118{
1119 struct uart_port port;
1120 int line;
1121 int rc;
1122
1123 rc = pci_enable_device(dev);
1124 if (rc)
1125 return rc;
1126
1127 memset(&port, 0, sizeof(port));
1128 port.ops = &serial_txx9_pops;
1129 port.flags |= UPF_TXX9_HAVE_CTS_LINE;
1130 port.uartclk = 66670000;
1131 port.irq = dev->irq;
1132 port.iotype = UPIO_PORT;
1133 port.iobase = pci_resource_start(dev, 1);
1134 port.dev = &dev->dev;
1135 line = serial_txx9_register_port(&port);
1136 if (line < 0) {
1137 printk(KERN_WARNING "Couldn't register serial port %s: %d\n", pci_name(dev), line);
1138 pci_disable_device(dev);
1139 return line;
1140 }
1141 pci_set_drvdata(dev, &serial_txx9_ports[line]);
1142
1143 return 0;
1144}
1145
1146static void pciserial_txx9_remove_one(struct pci_dev *dev)
1147{
1148 struct uart_port *up = pci_get_drvdata(dev);
1149
1150 if (up) {
1151 serial_txx9_unregister_port(up->line);
1152 pci_disable_device(dev);
1153 }
1154}
1155
1156#ifdef CONFIG_PM
1157static int pciserial_txx9_suspend_one(struct pci_dev *dev, pm_message_t state)
1158{
1159 struct uart_port *up = pci_get_drvdata(dev);
1160
1161 if (up)
1162 uart_suspend_port(&serial_txx9_reg, up);
1163 pci_save_state(dev);
1164 pci_set_power_state(dev, pci_choose_state(dev, state));
1165 return 0;
1166}
1167
1168static int pciserial_txx9_resume_one(struct pci_dev *dev)
1169{
1170 struct uart_port *up = pci_get_drvdata(dev);
1171
1172 pci_set_power_state(dev, PCI_D0);
1173 pci_restore_state(dev);
1174 if (up)
1175 uart_resume_port(&serial_txx9_reg, up);
1176 return 0;
1177}
1178#endif
1179
1180static const struct pci_device_id serial_txx9_pci_tbl[] = {
1181 { PCI_DEVICE(PCI_VENDOR_ID_TOSHIBA_2, PCI_DEVICE_ID_TOSHIBA_TC86C001_MISC) },
1182 { 0, }
1183};
1184
1185static struct pci_driver serial_txx9_pci_driver = {
1186 .name = "serial_txx9",
1187 .probe = pciserial_txx9_init_one,
1188 .remove = pciserial_txx9_remove_one,
1189#ifdef CONFIG_PM
1190 .suspend = pciserial_txx9_suspend_one,
1191 .resume = pciserial_txx9_resume_one,
1192#endif
1193 .id_table = serial_txx9_pci_tbl,
1194};
1195
1196MODULE_DEVICE_TABLE(pci, serial_txx9_pci_tbl);
1197#endif /* ENABLE_SERIAL_TXX9_PCI */
1198
1199static struct platform_device *serial_txx9_plat_devs;
1200
1201static int __init serial_txx9_init(void)
1202{
1203 int ret;
1204
1205 ret = uart_register_driver(&serial_txx9_reg);
1206 if (ret)
1207 goto out;
1208
1209 serial_txx9_plat_devs = platform_device_alloc("serial_txx9", -1);
1210 if (!serial_txx9_plat_devs) {
1211 ret = -ENOMEM;
1212 goto unreg_uart_drv;
1213 }
1214
1215 ret = platform_device_add(serial_txx9_plat_devs);
1216 if (ret)
1217 goto put_dev;
1218
1219 serial_txx9_register_ports(&serial_txx9_reg,
1220 &serial_txx9_plat_devs->dev);
1221
1222 ret = platform_driver_register(&serial_txx9_plat_driver);
1223 if (ret)
1224 goto del_dev;
1225
1226#ifdef ENABLE_SERIAL_TXX9_PCI
1227 ret = pci_register_driver(&serial_txx9_pci_driver);
1228 if (ret) {
1229 platform_driver_unregister(&serial_txx9_plat_driver);
1230 }
1231#endif
1232 if (ret == 0)
1233 goto out;
1234
1235 del_dev:
1236 platform_device_del(serial_txx9_plat_devs);
1237 put_dev:
1238 platform_device_put(serial_txx9_plat_devs);
1239 unreg_uart_drv:
1240 uart_unregister_driver(&serial_txx9_reg);
1241 out:
1242 return ret;
1243}
1244
1245static void __exit serial_txx9_exit(void)
1246{
1247 int i;
1248
1249#ifdef ENABLE_SERIAL_TXX9_PCI
1250 pci_unregister_driver(&serial_txx9_pci_driver);
1251#endif
1252 platform_driver_unregister(&serial_txx9_plat_driver);
1253 platform_device_unregister(serial_txx9_plat_devs);
1254 for (i = 0; i < UART_NR; i++) {
1255 struct uart_port *up = &serial_txx9_ports[i];
1256 if (up->iobase || up->mapbase)
1257 uart_remove_one_port(&serial_txx9_reg, up);
1258 }
1259
1260 uart_unregister_driver(&serial_txx9_reg);
1261}
1262
1263module_init(serial_txx9_init);
1264module_exit(serial_txx9_exit);
1265
1266MODULE_LICENSE("GPL");
1267MODULE_DESCRIPTION("TX39/49 serial driver");
1268
1269MODULE_ALIAS_CHARDEV_MAJOR(TXX9_TTY_MAJOR);