MIPS: Malta: Change CPU default to R2.
[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 <yoichi_yuasa@tripeaks.co.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                 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);
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);
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 platform_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->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 platform_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->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 platform_device *dev, pm_message_t state)
980 {
981         struct uart_port *port;
982         int i;
983
984         for (i = 0; i < siu_uart_driver.nr; i++) {
985                 port = &siu_uart_ports[i];
986                 if ((port->type == PORT_VR41XX_SIU ||
987                      port->type == PORT_VR41XX_DSIU) && port->dev == &dev->dev)
988                         uart_suspend_port(&siu_uart_driver, port);
989
990         }
991
992         return 0;
993 }
994
995 static int siu_resume(struct platform_device *dev)
996 {
997         struct uart_port *port;
998         int i;
999
1000         for (i = 0; i < siu_uart_driver.nr; i++) {
1001                 port = &siu_uart_ports[i];
1002                 if ((port->type == PORT_VR41XX_SIU ||
1003                      port->type == PORT_VR41XX_DSIU) && port->dev == &dev->dev)
1004                         uart_resume_port(&siu_uart_driver, port);
1005         }
1006
1007         return 0;
1008 }
1009
1010 static struct platform_device *siu_platform_device;
1011
1012 static struct platform_driver siu_device_driver = {
1013         .probe          = siu_probe,
1014         .remove         = siu_remove,
1015         .suspend        = siu_suspend,
1016         .resume         = siu_resume,
1017         .driver         = {
1018                 .name   = "SIU",
1019         },
1020 };
1021
1022 static int __devinit vr41xx_siu_init(void)
1023 {
1024         int retval;
1025
1026         siu_platform_device = platform_device_register_simple("SIU", -1, NULL, 0);
1027         if (IS_ERR(siu_platform_device))
1028                 return PTR_ERR(siu_platform_device);
1029
1030         retval = platform_driver_register(&siu_device_driver);
1031         if (retval < 0)
1032                 platform_device_unregister(siu_platform_device);
1033
1034         return retval;
1035 }
1036
1037 static void __devexit vr41xx_siu_exit(void)
1038 {
1039         platform_driver_unregister(&siu_device_driver);
1040
1041         platform_device_unregister(siu_platform_device);
1042 }
1043
1044 module_init(vr41xx_siu_init);
1045 module_exit(vr41xx_siu_exit);