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Linux v2.6.13
[linux-2.6/next.git] / drivers / serial / vr41xx_siu.c
blob1f985327b0d485ec8b4648073ef39a80d25d28f1
1 /*
2 * Driver for NEC VR4100 series Serial Interface Unit.
3 *
4 * Copyright (C) 2004-2005 Yoichi Yuasa <yuasa@hh.iij4u.or.jp>
5 *
6 * Based on drivers/serial/8250.c, by Russell King.
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 */
22 #include <linux/config.h>
23
24 #if defined(CONFIG_SERIAL_VR41XX_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
25 #define SUPPORT_SYSRQ
26 #endif
27
28 #include <linux/console.h>
29 #include <linux/device.h>
30 #include <linux/err.h>
31 #include <linux/ioport.h>
32 #include <linux/init.h>
33 #include <linux/interrupt.h>
34 #include <linux/module.h>
35 #include <linux/serial.h>
36 #include <linux/serial_core.h>
37 #include <linux/serial_reg.h>
38 #include <linux/tty.h>
39 #include <linux/tty_flip.h>
40
41 #include <asm/io.h>
42 #include <asm/vr41xx/siu.h>
43 #include <asm/vr41xx/vr41xx.h>
44
45 #define SIU_PORTS_MAX 2
46 #define SIU_BAUD_BASE 1152000
47 #define SIU_MAJOR 204
48 #define SIU_MINOR_BASE 82
49
50 #define RX_MAX_COUNT 256
51 #define TX_MAX_COUNT 15
52
53 #define SIUIRSEL 0x08
54 #define TMICMODE 0x20
55 #define TMICTX 0x10
56 #define IRMSEL 0x0c
57 #define IRMSEL_HP 0x08
58 #define IRMSEL_TEMIC 0x04
59 #define IRMSEL_SHARP 0x00
60 #define IRUSESEL 0x02
61 #define SIRSEL 0x01
62
63 struct siu_port {
64 unsigned int type;
65 unsigned int irq;
66 unsigned long start;
67 };
68
69 static const struct siu_port siu_type1_ports[] = {
70 { .type = PORT_VR41XX_SIU,
71 .irq = SIU_IRQ,
72 .start = 0x0c000000UL, },
73 };
74
75 #define SIU_TYPE1_NR_PORTS (sizeof(siu_type1_ports) / sizeof(struct siu_port))
76
77 static const struct siu_port siu_type2_ports[] = {
78 { .type = PORT_VR41XX_SIU,
79 .irq = SIU_IRQ,
80 .start = 0x0f000800UL, },
81 { .type = PORT_VR41XX_DSIU,
82 .irq = DSIU_IRQ,
83 .start = 0x0f000820UL, },
84 };
85
86 #define SIU_TYPE2_NR_PORTS (sizeof(siu_type2_ports) / sizeof(struct siu_port))
87
88 static struct uart_port siu_uart_ports[SIU_PORTS_MAX];
89 static uint8_t lsr_break_flag[SIU_PORTS_MAX];
90
91 #define siu_read(port, offset) readb((port)->membase + (offset))
92 #define siu_write(port, offset, value) writeb((value), (port)->membase + (offset))
93
94 void vr41xx_select_siu_interface(siu_interface_t interface)
95 {
96 struct uart_port *port;
97 unsigned long flags;
98 uint8_t irsel;
99
100 port = &siu_uart_ports[0];
101
102 spin_lock_irqsave(&port->lock, flags);
103
104 irsel = siu_read(port, SIUIRSEL);
105 if (interface == SIU_INTERFACE_IRDA)
106 irsel |= SIRSEL;
107 else
108 irsel &= ~SIRSEL;
109 siu_write(port, SIUIRSEL, irsel);
110
111 spin_unlock_irqrestore(&port->lock, flags);
112 }
113
114 EXPORT_SYMBOL_GPL(vr41xx_select_siu_interface);
115
116 void vr41xx_use_irda(irda_use_t use)
117 {
118 struct uart_port *port;
119 unsigned long flags;
120 uint8_t irsel;
121
122 port = &siu_uart_ports[0];
123
124 spin_lock_irqsave(&port->lock, flags);
125
126 irsel = siu_read(port, SIUIRSEL);
127 if (use == FIR_USE_IRDA)
128 irsel |= IRUSESEL;
129 else
130 irsel &= ~IRUSESEL;
131 siu_write(port, SIUIRSEL, irsel);
132
133 spin_unlock_irqrestore(&port->lock, flags);
134 }
135
136 EXPORT_SYMBOL_GPL(vr41xx_use_irda);
137
138 void vr41xx_select_irda_module(irda_module_t module, irda_speed_t speed)
139 {
140 struct uart_port *port;
141 unsigned long flags;
142 uint8_t irsel;
143
144 port = &siu_uart_ports[0];
145
146 spin_lock_irqsave(&port->lock, flags);
147
148 irsel = siu_read(port, SIUIRSEL);
149 irsel &= ~(IRMSEL | TMICTX | TMICMODE);
150 switch (module) {
151 case SHARP_IRDA:
152 irsel |= IRMSEL_SHARP;
153 break;
154 case TEMIC_IRDA:
155 irsel |= IRMSEL_TEMIC | TMICMODE;
156 if (speed == IRDA_TX_4MBPS)
157 irsel |= TMICTX;
158 break;
159 case HP_IRDA:
160 irsel |= IRMSEL_HP;
161 break;
162 default:
163 break;
164 }
165 siu_write(port, SIUIRSEL, irsel);
166
167 spin_unlock_irqrestore(&port->lock, flags);
168 }
169
170 EXPORT_SYMBOL_GPL(vr41xx_select_irda_module);
171
172 static inline void siu_clear_fifo(struct uart_port *port)
173 {
174 siu_write(port, UART_FCR, UART_FCR_ENABLE_FIFO);
175 siu_write(port, UART_FCR, UART_FCR_ENABLE_FIFO | UART_FCR_CLEAR_RCVR |
176 UART_FCR_CLEAR_XMIT);
177 siu_write(port, UART_FCR, 0);
178 }
179
180 static inline int siu_probe_ports(void)
181 {
182 switch (current_cpu_data.cputype) {
183 case CPU_VR4111:
184 case CPU_VR4121:
185 return SIU_TYPE1_NR_PORTS;
186 case CPU_VR4122:
187 case CPU_VR4131:
188 case CPU_VR4133:
189 return SIU_TYPE2_NR_PORTS;
190 }
191
192 return 0;
193 }
194
195 static inline unsigned long siu_port_size(struct uart_port *port)
196 {
197 switch (port->type) {
198 case PORT_VR41XX_SIU:
199 return 11UL;
200 case PORT_VR41XX_DSIU:
201 return 8UL;
202 }
203
204 return 0;
205 }
206
207 static inline unsigned int siu_check_type(struct uart_port *port)
208 {
209 switch (current_cpu_data.cputype) {
210 case CPU_VR4111:
211 case CPU_VR4121:
212 if (port->line == 0)
213 return PORT_VR41XX_SIU;
214 break;
215 case CPU_VR4122:
216 case CPU_VR4131:
217 case CPU_VR4133:
218 if (port->line == 0)
219 return PORT_VR41XX_SIU;
220 else if (port->line == 1)
221 return PORT_VR41XX_DSIU;
222 break;
223 }
224
225 return PORT_UNKNOWN;
226 }
227
228 static inline const char *siu_type_name(struct uart_port *port)
229 {
230 switch (port->type) {
231 case PORT_VR41XX_SIU:
232 return "SIU";
233 case PORT_VR41XX_DSIU:
234 return "DSIU";
235 }
236
237 return NULL;
238 }
239
240 static unsigned int siu_tx_empty(struct uart_port *port)
241 {
242 uint8_t lsr;
243
244 lsr = siu_read(port, UART_LSR);
245 if (lsr & UART_LSR_TEMT)
246 return TIOCSER_TEMT;
247
248 return 0;
249 }
250
251 static void siu_set_mctrl(struct uart_port *port, unsigned int mctrl)
252 {
253 uint8_t mcr = 0;
254
255 if (mctrl & TIOCM_DTR)
256 mcr |= UART_MCR_DTR;
257 if (mctrl & TIOCM_RTS)
258 mcr |= UART_MCR_RTS;
259 if (mctrl & TIOCM_OUT1)
260 mcr |= UART_MCR_OUT1;
261 if (mctrl & TIOCM_OUT2)
262 mcr |= UART_MCR_OUT2;
263 if (mctrl & TIOCM_LOOP)
264 mcr |= UART_MCR_LOOP;
265
266 siu_write(port, UART_MCR, mcr);
267 }
268
269 static unsigned int siu_get_mctrl(struct uart_port *port)
270 {
271 uint8_t msr;
272 unsigned int mctrl = 0;
273
274 msr = siu_read(port, UART_MSR);
275 if (msr & UART_MSR_DCD)
276 mctrl |= TIOCM_CAR;
277 if (msr & UART_MSR_RI)
278 mctrl |= TIOCM_RNG;
279 if (msr & UART_MSR_DSR)
280 mctrl |= TIOCM_DSR;
281 if (msr & UART_MSR_CTS)
282 mctrl |= TIOCM_CTS;
283
284 return mctrl;
285 }
286
287 static void siu_stop_tx(struct uart_port *port, unsigned int tty_stop)
288 {
289 unsigned long flags;
290 uint8_t ier;
291
292 spin_lock_irqsave(&port->lock, flags);
293
294 ier = siu_read(port, UART_IER);
295 ier &= ~UART_IER_THRI;
296 siu_write(port, UART_IER, ier);
297
298 spin_unlock_irqrestore(&port->lock, flags);
299 }
300
301 static void siu_start_tx(struct uart_port *port, unsigned int tty_start)
302 {
303 unsigned long flags;
304 uint8_t ier;
305
306 spin_lock_irqsave(&port->lock, flags);
307
308 ier = siu_read(port, UART_IER);
309 ier |= UART_IER_THRI;
310 siu_write(port, UART_IER, ier);
311
312 spin_unlock_irqrestore(&port->lock, flags);
313 }
314
315 static void siu_stop_rx(struct uart_port *port)
316 {
317 unsigned long flags;
318 uint8_t ier;
319
320 spin_lock_irqsave(&port->lock, flags);
321
322 ier = siu_read(port, UART_IER);
323 ier &= ~UART_IER_RLSI;
324 siu_write(port, UART_IER, ier);
325
326 port->read_status_mask &= ~UART_LSR_DR;
327
328 spin_unlock_irqrestore(&port->lock, flags);
329 }
330
331 static void siu_enable_ms(struct uart_port *port)
332 {
333 unsigned long flags;
334 uint8_t ier;
335
336 spin_lock_irqsave(&port->lock, flags);
337
338 ier = siu_read(port, UART_IER);
339 ier |= UART_IER_MSI;
340 siu_write(port, UART_IER, ier);
341
342 spin_unlock_irqrestore(&port->lock, flags);
343 }
344
345 static void siu_break_ctl(struct uart_port *port, int ctl)
346 {
347 unsigned long flags;
348 uint8_t lcr;
349
350 spin_lock_irqsave(&port->lock, flags);
351
352 lcr = siu_read(port, UART_LCR);
353 if (ctl == -1)
354 lcr |= UART_LCR_SBC;
355 else
356 lcr &= ~UART_LCR_SBC;
357 siu_write(port, UART_LCR, lcr);
358
359 spin_unlock_irqrestore(&port->lock, flags);
360 }
361
362 static inline void receive_chars(struct uart_port *port, uint8_t *status,
363 struct pt_regs *regs)
364 {
365 struct tty_struct *tty;
366 uint8_t lsr, ch;
367 char flag;
368 int max_count = RX_MAX_COUNT;
369
370 tty = port->info->tty;
371 lsr = *status;
372
373 do {
374 if (unlikely(tty->flip.count >= TTY_FLIPBUF_SIZE)) {
375 if (tty->low_latency)
376 tty_flip_buffer_push(tty);
377 }
378
379 ch = siu_read(port, UART_RX);
380 port->icount.rx++;
381 flag = TTY_NORMAL;
382
383 #ifdef CONFIG_SERIAL_VR41XX_CONSOLE
384 lsr |= lsr_break_flag[port->line];
385 lsr_break_flag[port->line] = 0;
386 #endif
387 if (unlikely(lsr & (UART_LSR_BI | UART_LSR_FE |
388 UART_LSR_PE | UART_LSR_OE))) {
389 if (lsr & UART_LSR_BI) {
390 lsr &= ~(UART_LSR_FE | UART_LSR_PE);
391 port->icount.brk++;
392
393 if (uart_handle_break(port))
394 goto ignore_char;
395 }
396
397 if (lsr & UART_LSR_FE)
398 port->icount.frame++;
399 if (lsr & UART_LSR_PE)
400 port->icount.parity++;
401 if (lsr & UART_LSR_OE)
402 port->icount.overrun++;
403
404 lsr &= port->read_status_mask;
405 if (lsr & UART_LSR_BI)
406 flag = TTY_BREAK;
407 if (lsr & UART_LSR_FE)
408 flag = TTY_FRAME;
409 if (lsr & UART_LSR_PE)
410 flag = TTY_PARITY;
411 }
412
413 if (uart_handle_sysrq_char(port, ch, regs))
414 goto ignore_char;
415
416 uart_insert_char(port, lsr, UART_LSR_OE, ch, flag);
417
418 ignore_char:
419 lsr = siu_read(port, UART_LSR);
420 } while ((lsr & UART_LSR_DR) && (max_count-- > 0));
421
422 tty_flip_buffer_push(tty);
423
424 *status = lsr;
425 }
426
427 static inline void check_modem_status(struct uart_port *port)
428 {
429 uint8_t msr;
430
431 msr = siu_read(port, UART_MSR);
432 if ((msr & UART_MSR_ANY_DELTA) == 0)
433 return;
434 if (msr & UART_MSR_DDCD)
435 uart_handle_dcd_change(port, msr & UART_MSR_DCD);
436 if (msr & UART_MSR_TERI)
437 port->icount.rng++;
438 if (msr & UART_MSR_DDSR)
439 port->icount.dsr++;
440 if (msr & UART_MSR_DCTS)
441 uart_handle_cts_change(port, msr & UART_MSR_CTS);
442
443 wake_up_interruptible(&port->info->delta_msr_wait);
444 }
445
446 static inline void transmit_chars(struct uart_port *port)
447 {
448 struct circ_buf *xmit;
449 int max_count = TX_MAX_COUNT;
450
451 xmit = &port->info->xmit;
452
453 if (port->x_char) {
454 siu_write(port, UART_TX, port->x_char);
455 port->icount.tx++;
456 port->x_char = 0;
457 return;
458 }
459
460 if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
461 siu_stop_tx(port, 0);
462 return;
463 }
464
465 do {
466 siu_write(port, UART_TX, xmit->buf[xmit->tail]);
467 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
468 port->icount.tx++;
469 if (uart_circ_empty(xmit))
470 break;
471 } while (max_count-- > 0);
472
473 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
474 uart_write_wakeup(port);
475
476 if (uart_circ_empty(xmit))
477 siu_stop_tx(port, 0);
478 }
479
480 static irqreturn_t siu_interrupt(int irq, void *dev_id, struct pt_regs *regs)
481 {
482 struct uart_port *port;
483 uint8_t iir, lsr;
484
485 port = (struct uart_port *)dev_id;
486
487 iir = siu_read(port, UART_IIR);
488 if (iir & UART_IIR_NO_INT)
489 return IRQ_NONE;
490
491 lsr = siu_read(port, UART_LSR);
492 if (lsr & UART_LSR_DR)
493 receive_chars(port, &lsr, regs);
494
495 check_modem_status(port);
496
497 if (lsr & UART_LSR_THRE)
498 transmit_chars(port);
499
500 return IRQ_HANDLED;
501 }
502
503 static int siu_startup(struct uart_port *port)
504 {
505 int retval;
506
507 if (port->membase == NULL)
508 return -ENODEV;
509
510 siu_clear_fifo(port);
511
512 (void)siu_read(port, UART_LSR);
513 (void)siu_read(port, UART_RX);
514 (void)siu_read(port, UART_IIR);
515 (void)siu_read(port, UART_MSR);
516
517 if (siu_read(port, UART_LSR) == 0xff)
518 return -ENODEV;
519
520 retval = request_irq(port->irq, siu_interrupt, 0, siu_type_name(port), port);
521 if (retval)
522 return retval;
523
524 if (port->type == PORT_VR41XX_DSIU)
525 vr41xx_enable_dsiuint(DSIUINT_ALL);
526
527 siu_write(port, UART_LCR, UART_LCR_WLEN8);
528
529 spin_lock_irq(&port->lock);
530 siu_set_mctrl(port, port->mctrl);
531 spin_unlock_irq(&port->lock);
532
533 siu_write(port, UART_IER, UART_IER_RLSI | UART_IER_RDI);
534
535 (void)siu_read(port, UART_LSR);
536 (void)siu_read(port, UART_RX);
537 (void)siu_read(port, UART_IIR);
538 (void)siu_read(port, UART_MSR);
539
540 return 0;
541 }
542
543 static void siu_shutdown(struct uart_port *port)
544 {
545 unsigned long flags;
546 uint8_t lcr;
547
548 siu_write(port, UART_IER, 0);
549
550 spin_lock_irqsave(&port->lock, flags);
551
552 port->mctrl &= ~TIOCM_OUT2;
553 siu_set_mctrl(port, port->mctrl);
554
555 spin_unlock_irqrestore(&port->lock, flags);
556
557 lcr = siu_read(port, UART_LCR);
558 lcr &= ~UART_LCR_SBC;
559 siu_write(port, UART_LCR, lcr);
560
561 siu_clear_fifo(port);
562
563 (void)siu_read(port, UART_RX);
564
565 if (port->type == PORT_VR41XX_DSIU)
566 vr41xx_disable_dsiuint(DSIUINT_ALL);
567
568 free_irq(port->irq, port);
569 }
570
571 static void siu_set_termios(struct uart_port *port, struct termios *new,
572 struct termios *old)
573 {
574 tcflag_t c_cflag, c_iflag;
575 uint8_t lcr, fcr, ier;
576 unsigned int baud, quot;
577 unsigned long flags;
578
579 c_cflag = new->c_cflag;
580 switch (c_cflag & CSIZE) {
581 case CS5:
582 lcr = UART_LCR_WLEN5;
583 break;
584 case CS6:
585 lcr = UART_LCR_WLEN6;
586 break;
587 case CS7:
588 lcr = UART_LCR_WLEN7;
589 break;
590 default:
591 lcr = UART_LCR_WLEN8;
592 break;
593 }
594
595 if (c_cflag & CSTOPB)
596 lcr |= UART_LCR_STOP;
597 if (c_cflag & PARENB)
598 lcr |= UART_LCR_PARITY;
599 if ((c_cflag & PARODD) != PARODD)
600 lcr |= UART_LCR_EPAR;
601 if (c_cflag & CMSPAR)
602 lcr |= UART_LCR_SPAR;
603
604 baud = uart_get_baud_rate(port, new, old, 0, port->uartclk/16);
605 quot = uart_get_divisor(port, baud);
606
607 fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10;
608
609 spin_lock_irqsave(&port->lock, flags);
610
611 uart_update_timeout(port, c_cflag, baud);
612
613 c_iflag = new->c_iflag;
614
615 port->read_status_mask = UART_LSR_THRE | UART_LSR_OE | UART_LSR_DR;
616 if (c_iflag & INPCK)
617 port->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
618 if (c_iflag & (BRKINT | PARMRK))
619 port->read_status_mask |= UART_LSR_BI;
620
621 port->ignore_status_mask = 0;
622 if (c_iflag & IGNPAR)
623 port->ignore_status_mask |= UART_LSR_FE | UART_LSR_PE;
624 if (c_iflag & IGNBRK) {
625 port->ignore_status_mask |= UART_LSR_BI;
626 if (c_iflag & IGNPAR)
627 port->ignore_status_mask |= UART_LSR_OE;
628 }
629
630 if ((c_cflag & CREAD) == 0)
631 port->ignore_status_mask |= UART_LSR_DR;
632
633 ier = siu_read(port, UART_IER);
634 ier &= ~UART_IER_MSI;
635 if (UART_ENABLE_MS(port, c_cflag))
636 ier |= UART_IER_MSI;
637 siu_write(port, UART_IER, ier);
638
639 siu_write(port, UART_LCR, lcr | UART_LCR_DLAB);
640
641 siu_write(port, UART_DLL, (uint8_t)quot);
642 siu_write(port, UART_DLM, (uint8_t)(quot >> 8));
643
644 siu_write(port, UART_LCR, lcr);
645
646 siu_write(port, UART_FCR, fcr);
647
648 siu_set_mctrl(port, port->mctrl);
649
650 spin_unlock_irqrestore(&port->lock, flags);
651 }
652
653 static void siu_pm(struct uart_port *port, unsigned int state, unsigned int oldstate)
654 {
655 switch (state) {
656 case 0:
657 switch (port->type) {
658 case PORT_VR41XX_SIU:
659 vr41xx_supply_clock(SIU_CLOCK);
660 break;
661 case PORT_VR41XX_DSIU:
662 vr41xx_supply_clock(DSIU_CLOCK);
663 break;
664 }
665 break;
666 case 3:
667 switch (port->type) {
668 case PORT_VR41XX_SIU:
669 vr41xx_mask_clock(SIU_CLOCK);
670 break;
671 case PORT_VR41XX_DSIU:
672 vr41xx_mask_clock(DSIU_CLOCK);
673 break;
674 }
675 break;
676 }
677 }
678
679 static const char *siu_type(struct uart_port *port)
680 {
681 return siu_type_name(port);
682 }
683
684 static void siu_release_port(struct uart_port *port)
685 {
686 unsigned long size;
687
688 if (port->flags & UPF_IOREMAP) {
689 iounmap(port->membase);
690 port->membase = NULL;
691 }
692
693 size = siu_port_size(port);
694 release_mem_region(port->mapbase, size);
695 }
696
697 static int siu_request_port(struct uart_port *port)
698 {
699 unsigned long size;
700 struct resource *res;
701
702 size = siu_port_size(port);
703 res = request_mem_region(port->mapbase, size, siu_type_name(port));
704 if (res == NULL)
705 return -EBUSY;
706
707 if (port->flags & UPF_IOREMAP) {
708 port->membase = ioremap(port->mapbase, size);
709 if (port->membase == NULL) {
710 release_resource(res);
711 return -ENOMEM;
712 }
713 }
714
715 return 0;
716 }
717
718 static void siu_config_port(struct uart_port *port, int flags)
719 {
720 if (flags & UART_CONFIG_TYPE) {
721 port->type = siu_check_type(port);
722 (void)siu_request_port(port);
723 }
724 }
725
726 static int siu_verify_port(struct uart_port *port, struct serial_struct *serial)
727 {
728 if (port->type != PORT_VR41XX_SIU && port->type != PORT_VR41XX_DSIU)
729 return -EINVAL;
730 if (port->irq != serial->irq)
731 return -EINVAL;
732 if (port->iotype != serial->io_type)
733 return -EINVAL;
734 if (port->mapbase != (unsigned long)serial->iomem_base)
735 return -EINVAL;
736
737 return 0;
738 }
739
740 static struct uart_ops siu_uart_ops = {
741 .tx_empty = siu_tx_empty,
742 .set_mctrl = siu_set_mctrl,
743 .get_mctrl = siu_get_mctrl,
744 .stop_tx = siu_stop_tx,
745 .start_tx = siu_start_tx,
746 .stop_rx = siu_stop_rx,
747 .enable_ms = siu_enable_ms,
748 .break_ctl = siu_break_ctl,
749 .startup = siu_startup,
750 .shutdown = siu_shutdown,
751 .set_termios = siu_set_termios,
752 .pm = siu_pm,
753 .type = siu_type,
754 .release_port = siu_release_port,
755 .request_port = siu_request_port,
756 .config_port = siu_config_port,
757 .verify_port = siu_verify_port,
758 };
759
760 static int siu_init_ports(void)
761 {
762 const struct siu_port *siu;
763 struct uart_port *port;
764 int i, num;
765
766 switch (current_cpu_data.cputype) {
767 case CPU_VR4111:
768 case CPU_VR4121:
769 siu = siu_type1_ports;
770 break;
771 case CPU_VR4122:
772 case CPU_VR4131:
773 case CPU_VR4133:
774 siu = siu_type2_ports;
775 break;
776 default:
777 return 0;
778 }
779
780 port = siu_uart_ports;
781 num = siu_probe_ports();
782 for (i = 0; i < num; i++) {
783 spin_lock_init(&port->lock);
784 port->irq = siu->irq;
785 port->uartclk = SIU_BAUD_BASE * 16;
786 port->fifosize = 16;
787 port->regshift = 0;
788 port->iotype = UPIO_MEM;
789 port->flags = UPF_IOREMAP | UPF_BOOT_AUTOCONF;
790 port->type = siu->type;
791 port->line = i;
792 port->mapbase = siu->start;
793 siu++;
794 port++;
795 }
796
797 return num;
798 }
799
800 #ifdef CONFIG_SERIAL_VR41XX_CONSOLE
801
802 #define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE)
803
804 static void wait_for_xmitr(struct uart_port *port)
805 {
806 int timeout = 10000;
807 uint8_t lsr, msr;
808
809 do {
810 lsr = siu_read(port, UART_LSR);
811 if (lsr & UART_LSR_BI)
812 lsr_break_flag[port->line] = UART_LSR_BI;
813
814 if ((lsr & BOTH_EMPTY) == BOTH_EMPTY)
815 break;
816 } while (timeout-- > 0);
817
818 if (port->flags & UPF_CONS_FLOW) {
819 timeout = 1000000;
820
821 do {
822 msr = siu_read(port, UART_MSR);
823 if ((msr & UART_MSR_CTS) != 0)
824 break;
825 } while (timeout-- > 0);
826 }
827 }
828
829 static void siu_console_write(struct console *con, const char *s, unsigned count)
830 {
831 struct uart_port *port;
832 uint8_t ier;
833 unsigned i;
834
835 port = &siu_uart_ports[con->index];
836
837 ier = siu_read(port, UART_IER);
838 siu_write(port, UART_IER, 0);
839
840 for (i = 0; i < count && *s != '\0'; i++, s++) {
841 wait_for_xmitr(port);
842 siu_write(port, UART_TX, *s);
843 if (*s == '\n') {
844 wait_for_xmitr(port);
845 siu_write(port, UART_TX, '\r');
846 }
847 }
848
849 wait_for_xmitr(port);
850 siu_write(port, UART_IER, ier);
851 }
852
853 static int siu_console_setup(struct console *con, char *options)
854 {
855 struct uart_port *port;
856 int baud = 9600;
857 int parity = 'n';
858 int bits = 8;
859 int flow = 'n';
860
861 if (con->index >= SIU_PORTS_MAX)
862 con->index = 0;
863
864 port = &siu_uart_ports[con->index];
865 if (port->membase == NULL) {
866 if (port->mapbase == 0)
867 return -ENODEV;
868 port->membase = ioremap(port->mapbase, siu_port_size(port));
869 }
870
871 vr41xx_select_siu_interface(SIU_INTERFACE_RS232C);
872
873 if (options != NULL)
874 uart_parse_options(options, &baud, &parity, &bits, &flow);
875
876 return uart_set_options(port, con, baud, parity, bits, flow);
877 }
878
879 static struct uart_driver siu_uart_driver;
880
881 static struct console siu_console = {
882 .name = "ttyVR",
883 .write = siu_console_write,
884 .device = uart_console_device,
885 .setup = siu_console_setup,
886 .flags = CON_PRINTBUFFER,
887 .index = -1,
888 .data = &siu_uart_driver,
889 };
890
891 static int __devinit siu_console_init(void)
892 {
893 struct uart_port *port;
894 int num, i;
895
896 num = siu_init_ports();
897 if (num <= 0)
898 return -ENODEV;
899
900 for (i = 0; i < num; i++) {
901 port = &siu_uart_ports[i];
902 port->ops = &siu_uart_ops;
903 }
904
905 register_console(&siu_console);
906
907 return 0;
908 }
909
910 console_initcall(siu_console_init);
911
912 #define SERIAL_VR41XX_CONSOLE &siu_console
913 #else
914 #define SERIAL_VR41XX_CONSOLE NULL
915 #endif
916
917 static struct uart_driver siu_uart_driver = {
918 .owner = THIS_MODULE,
919 .driver_name = "SIU",
920 .dev_name = "ttyVR",
921 .devfs_name = "ttvr/",
922 .major = SIU_MAJOR,
923 .minor = SIU_MINOR_BASE,
924 .cons = SERIAL_VR41XX_CONSOLE,
925 };
926
927 static int siu_probe(struct device *dev)
928 {
929 struct uart_port *port;
930 int num, i, retval;
931
932 num = siu_init_ports();
933 if (num <= 0)
934 return -ENODEV;
935
936 siu_uart_driver.nr = num;
937 retval = uart_register_driver(&siu_uart_driver);
938 if (retval)
939 return retval;
940
941 for (i = 0; i < num; i++) {
942 port = &siu_uart_ports[i];
943 port->ops = &siu_uart_ops;
944 port->dev = dev;
945
946 retval = uart_add_one_port(&siu_uart_driver, port);
947 if (retval < 0) {
948 port->dev = NULL;
949 break;
950 }
951 }
952
953 if (i == 0 && retval < 0) {
954 uart_unregister_driver(&siu_uart_driver);
955 return retval;
956 }
957
958 return 0;
959 }
960
961 static int siu_remove(struct device *dev)
962 {
963 struct uart_port *port;
964 int i;
965
966 for (i = 0; i < siu_uart_driver.nr; i++) {
967 port = &siu_uart_ports[i];
968 if (port->dev == dev) {
969 uart_remove_one_port(&siu_uart_driver, port);
970 port->dev = NULL;
971 }
972 }
973
974 uart_unregister_driver(&siu_uart_driver);
975
976 return 0;
977 }
978
979 static int siu_suspend(struct device *dev, pm_message_t state, u32 level)
980 {
981 struct uart_port *port;
982 int i;
983
984 if (level != SUSPEND_DISABLE)
985 return 0;
986
987 for (i = 0; i < siu_uart_driver.nr; i++) {
988 port = &siu_uart_ports[i];
989 if ((port->type == PORT_VR41XX_SIU ||
990 port->type == PORT_VR41XX_DSIU) && port->dev == dev)
991 uart_suspend_port(&siu_uart_driver, port);
992
993 }
994
995 return 0;
996 }
997
998 static int siu_resume(struct device *dev, u32 level)
999 {
1000 struct uart_port *port;
1001 int i;
1002
1003 if (level != RESUME_ENABLE)
1004 return 0;
1005
1006 for (i = 0; i < siu_uart_driver.nr; i++) {
1007 port = &siu_uart_ports[i];
1008 if ((port->type == PORT_VR41XX_SIU ||
1009 port->type == PORT_VR41XX_DSIU) && port->dev == dev)
1010 uart_resume_port(&siu_uart_driver, port);
1011 }
1012
1013 return 0;
1014 }
1015
1016 static struct platform_device *siu_platform_device;
1017
1018 static struct device_driver siu_device_driver = {
1019 .name = "SIU",
1020 .bus = &platform_bus_type,
1021 .probe = siu_probe,
1022 .remove = siu_remove,
1023 .suspend = siu_suspend,
1024 .resume = siu_resume,
1025 };
1026
1027 static int __devinit vr41xx_siu_init(void)
1028 {
1029 int retval;
1030
1031 siu_platform_device = platform_device_register_simple("SIU", -1, NULL, 0);
1032 if (IS_ERR(siu_platform_device))
1033 return PTR_ERR(siu_platform_device);
1034
1035 retval = driver_register(&siu_device_driver);
1036 if (retval < 0)
1037 platform_device_unregister(siu_platform_device);
1038
1039 return retval;
1040 }
1041
1042 static void __devexit vr41xx_siu_exit(void)
1043 {
1044 driver_unregister(&siu_device_driver);
1045
1046 platform_device_unregister(siu_platform_device);
1047 }
1048
1049 module_init(vr41xx_siu_init);
1050 module_exit(vr41xx_siu_exit);
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