Fix rpc shutdown event condition bug
[linux-2.6.git] / drivers / serial / vr41xx_siu.c
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/platform_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)
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)
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                 ch = siu_read(port, UART_RX);
375                 port->icount.rx++;
376                 flag = TTY_NORMAL;
377
378 #ifdef CONFIG_SERIAL_VR41XX_CONSOLE
379                 lsr |= lsr_break_flag[port->line];
380                 lsr_break_flag[port->line] = 0;
381 #endif
382                 if (unlikely(lsr & (UART_LSR_BI | UART_LSR_FE |
383                                     UART_LSR_PE | UART_LSR_OE))) {
384                         if (lsr & UART_LSR_BI) {
385                                 lsr &= ~(UART_LSR_FE | UART_LSR_PE);
386                                 port->icount.brk++;
387
388                                 if (uart_handle_break(port))
389                                         goto ignore_char;
390                         }
391
392                         if (lsr & UART_LSR_FE)
393                                 port->icount.frame++;
394                         if (lsr & UART_LSR_PE)
395                                 port->icount.parity++;
396                         if (lsr & UART_LSR_OE)
397                                 port->icount.overrun++;
398
399                         lsr &= port->read_status_mask;
400                         if (lsr & UART_LSR_BI)
401                                 flag = TTY_BREAK;
402                         if (lsr & UART_LSR_FE)
403                                 flag = TTY_FRAME;
404                         if (lsr & UART_LSR_PE)
405                                 flag = TTY_PARITY;
406                 }
407
408                 if (uart_handle_sysrq_char(port, ch, regs))
409                         goto ignore_char;
410
411                 uart_insert_char(port, lsr, UART_LSR_OE, ch, flag);
412
413         ignore_char:
414                 lsr = siu_read(port, UART_LSR);
415         } while ((lsr & UART_LSR_DR) && (max_count-- > 0));
416
417         tty_flip_buffer_push(tty);
418
419         *status = lsr;
420 }
421
422 static inline void check_modem_status(struct uart_port *port)
423 {
424         uint8_t msr;
425
426         msr = siu_read(port, UART_MSR);
427         if ((msr & UART_MSR_ANY_DELTA) == 0)
428                 return;
429         if (msr & UART_MSR_DDCD)
430                 uart_handle_dcd_change(port, msr & UART_MSR_DCD);
431         if (msr & UART_MSR_TERI)
432                 port->icount.rng++;
433         if (msr & UART_MSR_DDSR)
434                 port->icount.dsr++;
435         if (msr & UART_MSR_DCTS)
436                 uart_handle_cts_change(port, msr & UART_MSR_CTS);
437
438         wake_up_interruptible(&port->info->delta_msr_wait);
439 }
440
441 static inline void transmit_chars(struct uart_port *port)
442 {
443         struct circ_buf *xmit;
444         int max_count = TX_MAX_COUNT;
445
446         xmit = &port->info->xmit;
447
448         if (port->x_char) {
449                 siu_write(port, UART_TX, port->x_char);
450                 port->icount.tx++;
451                 port->x_char = 0;
452                 return;
453         }
454
455         if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
456                 siu_stop_tx(port);
457                 return;
458         }
459
460         do {
461                 siu_write(port, UART_TX, xmit->buf[xmit->tail]);
462                 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
463                 port->icount.tx++;
464                 if (uart_circ_empty(xmit))
465                         break;
466         } while (max_count-- > 0);
467
468         if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
469                 uart_write_wakeup(port);
470
471         if (uart_circ_empty(xmit))
472                 siu_stop_tx(port);
473 }
474
475 static irqreturn_t siu_interrupt(int irq, void *dev_id, struct pt_regs *regs)
476 {
477         struct uart_port *port;
478         uint8_t iir, lsr;
479
480         port = (struct uart_port *)dev_id;
481
482         iir = siu_read(port, UART_IIR);
483         if (iir & UART_IIR_NO_INT)
484                 return IRQ_NONE;
485
486         lsr = siu_read(port, UART_LSR);
487         if (lsr & UART_LSR_DR)
488                 receive_chars(port, &lsr, regs);
489
490         check_modem_status(port);
491
492         if (lsr & UART_LSR_THRE)
493                 transmit_chars(port);
494
495         return IRQ_HANDLED;
496 }
497
498 static int siu_startup(struct uart_port *port)
499 {
500         int retval;
501
502         if (port->membase == NULL)
503                 return -ENODEV;
504
505         siu_clear_fifo(port);
506
507         (void)siu_read(port, UART_LSR);
508         (void)siu_read(port, UART_RX);
509         (void)siu_read(port, UART_IIR);
510         (void)siu_read(port, UART_MSR);
511
512         if (siu_read(port, UART_LSR) == 0xff)
513                 return -ENODEV;
514
515         retval = request_irq(port->irq, siu_interrupt, 0, siu_type_name(port), port);
516         if (retval)
517                 return retval;
518
519         if (port->type == PORT_VR41XX_DSIU)
520                 vr41xx_enable_dsiuint(DSIUINT_ALL);
521
522         siu_write(port, UART_LCR, UART_LCR_WLEN8);
523
524         spin_lock_irq(&port->lock);
525         siu_set_mctrl(port, port->mctrl);
526         spin_unlock_irq(&port->lock);
527
528         siu_write(port, UART_IER, UART_IER_RLSI | UART_IER_RDI);
529
530         (void)siu_read(port, UART_LSR);
531         (void)siu_read(port, UART_RX);
532         (void)siu_read(port, UART_IIR);
533         (void)siu_read(port, UART_MSR);
534
535         return 0;
536 }
537
538 static void siu_shutdown(struct uart_port *port)
539 {
540         unsigned long flags;
541         uint8_t lcr;
542
543         siu_write(port, UART_IER, 0);
544
545         spin_lock_irqsave(&port->lock, flags);
546
547         port->mctrl &= ~TIOCM_OUT2;
548         siu_set_mctrl(port, port->mctrl);
549
550         spin_unlock_irqrestore(&port->lock, flags);
551
552         lcr = siu_read(port, UART_LCR);
553         lcr &= ~UART_LCR_SBC;
554         siu_write(port, UART_LCR, lcr);
555
556         siu_clear_fifo(port);
557
558         (void)siu_read(port, UART_RX);
559
560         if (port->type == PORT_VR41XX_DSIU)
561                 vr41xx_disable_dsiuint(DSIUINT_ALL);
562
563         free_irq(port->irq, port);
564 }
565
566 static void siu_set_termios(struct uart_port *port, struct termios *new,
567                             struct termios *old)
568 {
569         tcflag_t c_cflag, c_iflag;
570         uint8_t lcr, fcr, ier;
571         unsigned int baud, quot;
572         unsigned long flags;
573
574         c_cflag = new->c_cflag;
575         switch (c_cflag & CSIZE) {
576         case CS5:
577                 lcr = UART_LCR_WLEN5;
578                 break;
579         case CS6:
580                 lcr = UART_LCR_WLEN6;
581                 break;
582         case CS7:
583                 lcr = UART_LCR_WLEN7;
584                 break;
585         default:
586                 lcr = UART_LCR_WLEN8;
587                 break;
588         }
589
590         if (c_cflag & CSTOPB)
591                 lcr |= UART_LCR_STOP;
592         if (c_cflag & PARENB)
593                 lcr |= UART_LCR_PARITY;
594         if ((c_cflag & PARODD) != PARODD)
595                 lcr |= UART_LCR_EPAR;
596         if (c_cflag & CMSPAR)
597                 lcr |= UART_LCR_SPAR;
598
599         baud = uart_get_baud_rate(port, new, old, 0, port->uartclk/16);
600         quot = uart_get_divisor(port, baud);
601
602         fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10;
603
604         spin_lock_irqsave(&port->lock, flags);
605
606         uart_update_timeout(port, c_cflag, baud);
607
608         c_iflag = new->c_iflag;
609
610         port->read_status_mask = UART_LSR_THRE | UART_LSR_OE | UART_LSR_DR;
611         if (c_iflag & INPCK)
612                 port->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
613         if (c_iflag & (BRKINT | PARMRK))
614                 port->read_status_mask |= UART_LSR_BI;
615
616         port->ignore_status_mask = 0;
617         if (c_iflag & IGNPAR)
618                 port->ignore_status_mask |= UART_LSR_FE | UART_LSR_PE;
619         if (c_iflag & IGNBRK) {
620                 port->ignore_status_mask |= UART_LSR_BI;
621                 if (c_iflag & IGNPAR)
622                         port->ignore_status_mask |= UART_LSR_OE;
623         }
624
625         if ((c_cflag & CREAD) == 0)
626                 port->ignore_status_mask |= UART_LSR_DR;
627
628         ier = siu_read(port, UART_IER);
629         ier &= ~UART_IER_MSI;
630         if (UART_ENABLE_MS(port, c_cflag))
631                 ier |= UART_IER_MSI;
632         siu_write(port, UART_IER, ier);
633
634         siu_write(port, UART_LCR, lcr | UART_LCR_DLAB);
635
636         siu_write(port, UART_DLL, (uint8_t)quot);
637         siu_write(port, UART_DLM, (uint8_t)(quot >> 8));
638
639         siu_write(port, UART_LCR, lcr);
640
641         siu_write(port, UART_FCR, fcr);
642
643         siu_set_mctrl(port, port->mctrl);
644
645         spin_unlock_irqrestore(&port->lock, flags);
646 }
647
648 static void siu_pm(struct uart_port *port, unsigned int state, unsigned int oldstate)
649 {
650         switch (state) {
651         case 0:
652                 switch (port->type) {
653                 case PORT_VR41XX_SIU:
654                         vr41xx_supply_clock(SIU_CLOCK);
655                         break;
656                 case PORT_VR41XX_DSIU:
657                         vr41xx_supply_clock(DSIU_CLOCK);
658                         break;
659                 }
660                 break;
661         case 3:
662                 switch (port->type) {
663                 case PORT_VR41XX_SIU:
664                         vr41xx_mask_clock(SIU_CLOCK);
665                         break;
666                 case PORT_VR41XX_DSIU:
667                         vr41xx_mask_clock(DSIU_CLOCK);
668                         break;
669                 }
670                 break;
671         }
672 }
673
674 static const char *siu_type(struct uart_port *port)
675 {
676         return siu_type_name(port);
677 }
678
679 static void siu_release_port(struct uart_port *port)
680 {
681         unsigned long size;
682
683         if (port->flags & UPF_IOREMAP) {
684                 iounmap(port->membase);
685                 port->membase = NULL;
686         }
687
688         size = siu_port_size(port);
689         release_mem_region(port->mapbase, size);
690 }
691
692 static int siu_request_port(struct uart_port *port)
693 {
694         unsigned long size;
695         struct resource *res;
696
697         size = siu_port_size(port);
698         res = request_mem_region(port->mapbase, size, siu_type_name(port));
699         if (res == NULL)
700                 return -EBUSY;
701
702         if (port->flags & UPF_IOREMAP) {
703                 port->membase = ioremap(port->mapbase, size);
704                 if (port->membase == NULL) {
705                         release_resource(res);
706                         return -ENOMEM;
707                 }
708         }
709
710         return 0;
711 }
712
713 static void siu_config_port(struct uart_port *port, int flags)
714 {
715         if (flags & UART_CONFIG_TYPE) {
716                 port->type = siu_check_type(port);
717                 (void)siu_request_port(port);
718         }
719 }
720
721 static int siu_verify_port(struct uart_port *port, struct serial_struct *serial)
722 {
723         if (port->type != PORT_VR41XX_SIU && port->type != PORT_VR41XX_DSIU)
724                 return -EINVAL;
725         if (port->irq != serial->irq)
726                 return -EINVAL;
727         if (port->iotype != serial->io_type)
728                 return -EINVAL;
729         if (port->mapbase != (unsigned long)serial->iomem_base)
730                 return -EINVAL;
731
732         return 0;
733 }
734
735 static struct uart_ops siu_uart_ops = {
736         .tx_empty       = siu_tx_empty,
737         .set_mctrl      = siu_set_mctrl,
738         .get_mctrl      = siu_get_mctrl,
739         .stop_tx        = siu_stop_tx,
740         .start_tx       = siu_start_tx,
741         .stop_rx        = siu_stop_rx,
742         .enable_ms      = siu_enable_ms,
743         .break_ctl      = siu_break_ctl,
744         .startup        = siu_startup,
745         .shutdown       = siu_shutdown,
746         .set_termios    = siu_set_termios,
747         .pm             = siu_pm,
748         .type           = siu_type,
749         .release_port   = siu_release_port,
750         .request_port   = siu_request_port,
751         .config_port    = siu_config_port,
752         .verify_port    = siu_verify_port,
753 };
754
755 static int siu_init_ports(void)
756 {
757         const struct siu_port *siu;
758         struct uart_port *port;
759         int i, num;
760
761         switch (current_cpu_data.cputype) {
762         case CPU_VR4111:
763         case CPU_VR4121:
764                 siu = siu_type1_ports;
765                 break;
766         case CPU_VR4122:
767         case CPU_VR4131:
768         case CPU_VR4133:
769                 siu = siu_type2_ports;
770                 break;
771         default:
772                 return 0;
773         }
774
775         port = siu_uart_ports;
776         num = siu_probe_ports();
777         for (i = 0; i < num; i++) {
778                 spin_lock_init(&port->lock);
779                 port->irq = siu->irq;
780                 port->uartclk = SIU_BAUD_BASE * 16;
781                 port->fifosize = 16;
782                 port->regshift = 0;
783                 port->iotype = UPIO_MEM;
784                 port->flags = UPF_IOREMAP | UPF_BOOT_AUTOCONF;
785                 port->type = siu->type;
786                 port->line = i;
787                 port->mapbase = siu->start;
788                 siu++;
789                 port++;
790         }
791
792         return num;
793 }
794
795 #ifdef CONFIG_SERIAL_VR41XX_CONSOLE
796
797 #define BOTH_EMPTY      (UART_LSR_TEMT | UART_LSR_THRE)
798
799 static void wait_for_xmitr(struct uart_port *port)
800 {
801         int timeout = 10000;
802         uint8_t lsr, msr;
803
804         do {
805                 lsr = siu_read(port, UART_LSR);
806                 if (lsr & UART_LSR_BI)
807                         lsr_break_flag[port->line] = UART_LSR_BI;
808
809                 if ((lsr & BOTH_EMPTY) == BOTH_EMPTY)
810                         break;
811         } while (timeout-- > 0);
812
813         if (port->flags & UPF_CONS_FLOW) {
814                 timeout = 1000000;
815
816                 do {
817                         msr = siu_read(port, UART_MSR);
818                         if ((msr & UART_MSR_CTS) != 0)
819                                 break;
820                 } while (timeout-- > 0);
821         }
822 }
823
824 static void siu_console_write(struct console *con, const char *s, unsigned count)
825 {
826         struct uart_port *port;
827         uint8_t ier;
828         unsigned i;
829
830         port = &siu_uart_ports[con->index];
831
832         ier = siu_read(port, UART_IER);
833         siu_write(port, UART_IER, 0);
834
835         for (i = 0; i < count && *s != '\0'; i++, s++) {
836                 wait_for_xmitr(port);
837                 siu_write(port, UART_TX, *s);
838                 if (*s == '\n') {
839                         wait_for_xmitr(port);
840                         siu_write(port, UART_TX, '\r');
841                 }
842         }
843
844         wait_for_xmitr(port);
845         siu_write(port, UART_IER, ier);
846 }
847
848 static int siu_console_setup(struct console *con, char *options)
849 {
850         struct uart_port *port;
851         int baud = 9600;
852         int parity = 'n';
853         int bits = 8;
854         int flow = 'n';
855
856         if (con->index >= SIU_PORTS_MAX)
857                 con->index = 0;
858
859         port = &siu_uart_ports[con->index];
860         if (port->membase == NULL) {
861                 if (port->mapbase == 0)
862                         return -ENODEV;
863                 port->membase = ioremap(port->mapbase, siu_port_size(port));
864         }
865
866         vr41xx_select_siu_interface(SIU_INTERFACE_RS232C);
867
868         if (options != NULL)
869                 uart_parse_options(options, &baud, &parity, &bits, &flow);
870
871         return uart_set_options(port, con, baud, parity, bits, flow);
872 }
873
874 static struct uart_driver siu_uart_driver;
875
876 static struct console siu_console = {
877         .name   = "ttyVR",
878         .write  = siu_console_write,
879         .device = uart_console_device,
880         .setup  = siu_console_setup,
881         .flags  = CON_PRINTBUFFER,
882         .index  = -1,
883         .data   = &siu_uart_driver,
884 };
885
886 static int __devinit siu_console_init(void)
887 {
888         struct uart_port *port;
889         int num, i;
890
891         num = siu_init_ports();
892         if (num <= 0)
893                 return -ENODEV;
894
895         for (i = 0; i < num; i++) {
896                 port = &siu_uart_ports[i];
897                 port->ops = &siu_uart_ops;
898         }
899
900         register_console(&siu_console);
901
902         return 0;
903 }
904
905 console_initcall(siu_console_init);
906
907 #define SERIAL_VR41XX_CONSOLE   &siu_console
908 #else
909 #define SERIAL_VR41XX_CONSOLE   NULL
910 #endif
911
912 static struct uart_driver siu_uart_driver = {
913         .owner          = THIS_MODULE,
914         .driver_name    = "SIU",
915         .dev_name       = "ttyVR",
916         .devfs_name     = "ttvr/",
917         .major          = SIU_MAJOR,
918         .minor          = SIU_MINOR_BASE,
919         .cons           = SERIAL_VR41XX_CONSOLE,
920 };
921
922 static int siu_probe(struct platform_device *dev)
923 {
924         struct uart_port *port;
925         int num, i, retval;
926
927         num = siu_init_ports();
928         if (num <= 0)
929                 return -ENODEV;
930
931         siu_uart_driver.nr = num;
932         retval = uart_register_driver(&siu_uart_driver);
933         if (retval)
934                 return retval;
935
936         for (i = 0; i < num; i++) {
937                 port = &siu_uart_ports[i];
938                 port->ops = &siu_uart_ops;
939                 port->dev = &dev->dev;
940
941                 retval = uart_add_one_port(&siu_uart_driver, port);
942                 if (retval < 0) {
943                         port->dev = NULL;
944                         break;
945                 }
946         }
947
948         if (i == 0 && retval < 0) {
949                 uart_unregister_driver(&siu_uart_driver);
950                 return retval;
951         }
952
953         return 0;
954 }
955
956 static int siu_remove(struct platform_device *dev)
957 {
958         struct uart_port *port;
959         int i;
960
961         for (i = 0; i < siu_uart_driver.nr; i++) {
962                 port = &siu_uart_ports[i];
963                 if (port->dev == &dev->dev) {
964                         uart_remove_one_port(&siu_uart_driver, port);
965                         port->dev = NULL;
966                 }
967         }
968
969         uart_unregister_driver(&siu_uart_driver);
970
971         return 0;
972 }
973
974 static int siu_suspend(struct platform_device *dev, pm_message_t state)
975 {
976         struct uart_port *port;
977         int i;
978
979         for (i = 0; i < siu_uart_driver.nr; i++) {
980                 port = &siu_uart_ports[i];
981                 if ((port->type == PORT_VR41XX_SIU ||
982                      port->type == PORT_VR41XX_DSIU) && port->dev == &dev->dev)
983                         uart_suspend_port(&siu_uart_driver, port);
984
985         }
986
987         return 0;
988 }
989
990 static int siu_resume(struct platform_device *dev)
991 {
992         struct uart_port *port;
993         int i;
994
995         for (i = 0; i < siu_uart_driver.nr; i++) {
996                 port = &siu_uart_ports[i];
997                 if ((port->type == PORT_VR41XX_SIU ||
998                      port->type == PORT_VR41XX_DSIU) && port->dev == &dev->dev)
999                         uart_resume_port(&siu_uart_driver, port);
1000         }
1001
1002         return 0;
1003 }
1004
1005 static struct platform_device *siu_platform_device;
1006
1007 static struct platform_driver siu_device_driver = {
1008         .probe          = siu_probe,
1009         .remove         = siu_remove,
1010         .suspend        = siu_suspend,
1011         .resume         = siu_resume,
1012         .driver         = {
1013                 .name   = "SIU",
1014         },
1015 };
1016
1017 static int __devinit vr41xx_siu_init(void)
1018 {
1019         int retval;
1020
1021         siu_platform_device = platform_device_register_simple("SIU", -1, NULL, 0);
1022         if (IS_ERR(siu_platform_device))
1023                 return PTR_ERR(siu_platform_device);
1024
1025         retval = platform_driver_register(&siu_device_driver);
1026         if (retval < 0)
1027                 platform_device_unregister(siu_platform_device);
1028
1029         return retval;
1030 }
1031
1032 static void __devexit vr41xx_siu_exit(void)
1033 {
1034         platform_driver_unregister(&siu_device_driver);
1035
1036         platform_device_unregister(siu_platform_device);
1037 }
1038
1039 module_init(vr41xx_siu_init);
1040 module_exit(vr41xx_siu_exit);