Merge branch 'for-linus' of git://oss.sgi.com:8090/xfs/xfs-2.6
[linux-2.6] / drivers / serial / vr41xx_siu.c
1 /*
2  *  Driver for NEC VR4100 series Serial Interface Unit.
3  *
4  *  Copyright (C) 2004-2007  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
23 #if defined(CONFIG_SERIAL_VR41XX_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
24 #define SUPPORT_SYSRQ
25 #endif
26
27 #include <linux/console.h>
28 #include <linux/errno.h>
29 #include <linux/init.h>
30 #include <linux/interrupt.h>
31 #include <linux/ioport.h>
32 #include <linux/module.h>
33 #include <linux/platform_device.h>
34 #include <linux/serial.h>
35 #include <linux/serial_core.h>
36 #include <linux/serial_reg.h>
37 #include <linux/tty.h>
38 #include <linux/tty_flip.h>
39
40 #include <asm/io.h>
41 #include <asm/vr41xx/siu.h>
42 #include <asm/vr41xx/vr41xx.h>
43
44 #define SIU_BAUD_BASE   1152000
45 #define SIU_MAJOR       204
46 #define SIU_MINOR_BASE  82
47
48 #define RX_MAX_COUNT    256
49 #define TX_MAX_COUNT    15
50
51 #define SIUIRSEL        0x08
52  #define TMICMODE       0x20
53  #define TMICTX         0x10
54  #define IRMSEL         0x0c
55  #define IRMSEL_HP      0x08
56  #define IRMSEL_TEMIC   0x04
57  #define IRMSEL_SHARP   0x00
58  #define IRUSESEL       0x02
59  #define SIRSEL         0x01
60
61 static struct uart_port siu_uart_ports[SIU_PORTS_MAX] = {
62         [0 ... SIU_PORTS_MAX-1] = {
63                 .lock   = __SPIN_LOCK_UNLOCKED(siu_uart_ports->lock),
64                 .irq    = -1,
65         },
66 };
67
68 static uint8_t lsr_break_flag[SIU_PORTS_MAX];
69
70 #define siu_read(port, offset)          readb((port)->membase + (offset))
71 #define siu_write(port, offset, value)  writeb((value), (port)->membase + (offset))
72
73 void vr41xx_select_siu_interface(siu_interface_t interface)
74 {
75         struct uart_port *port;
76         unsigned long flags;
77         uint8_t irsel;
78
79         port = &siu_uart_ports[0];
80
81         spin_lock_irqsave(&port->lock, flags);
82
83         irsel = siu_read(port, SIUIRSEL);
84         if (interface == SIU_INTERFACE_IRDA)
85                 irsel |= SIRSEL;
86         else
87                 irsel &= ~SIRSEL;
88         siu_write(port, SIUIRSEL, irsel);
89
90         spin_unlock_irqrestore(&port->lock, flags);
91 }
92 EXPORT_SYMBOL_GPL(vr41xx_select_siu_interface);
93
94 void vr41xx_use_irda(irda_use_t use)
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 (use == FIR_USE_IRDA)
106                 irsel |= IRUSESEL;
107         else
108                 irsel &= ~IRUSESEL;
109         siu_write(port, SIUIRSEL, irsel);
110
111         spin_unlock_irqrestore(&port->lock, flags);
112 }
113 EXPORT_SYMBOL_GPL(vr41xx_use_irda);
114
115 void vr41xx_select_irda_module(irda_module_t module, irda_speed_t speed)
116 {
117         struct uart_port *port;
118         unsigned long flags;
119         uint8_t irsel;
120
121         port = &siu_uart_ports[0];
122
123         spin_lock_irqsave(&port->lock, flags);
124
125         irsel = siu_read(port, SIUIRSEL);
126         irsel &= ~(IRMSEL | TMICTX | TMICMODE);
127         switch (module) {
128         case SHARP_IRDA:
129                 irsel |= IRMSEL_SHARP;
130                 break;
131         case TEMIC_IRDA:
132                 irsel |= IRMSEL_TEMIC | TMICMODE;
133                 if (speed == IRDA_TX_4MBPS)
134                         irsel |= TMICTX;
135                 break;
136         case HP_IRDA:
137                 irsel |= IRMSEL_HP;
138                 break;
139         default:
140                 break;
141         }
142         siu_write(port, SIUIRSEL, irsel);
143
144         spin_unlock_irqrestore(&port->lock, flags);
145 }
146 EXPORT_SYMBOL_GPL(vr41xx_select_irda_module);
147
148 static inline void siu_clear_fifo(struct uart_port *port)
149 {
150         siu_write(port, UART_FCR, UART_FCR_ENABLE_FIFO);
151         siu_write(port, UART_FCR, UART_FCR_ENABLE_FIFO | UART_FCR_CLEAR_RCVR |
152                                   UART_FCR_CLEAR_XMIT);
153         siu_write(port, UART_FCR, 0);
154 }
155
156 static inline unsigned long siu_port_size(struct uart_port *port)
157 {
158         switch (port->type) {
159         case PORT_VR41XX_SIU:
160                 return 11UL;
161         case PORT_VR41XX_DSIU:
162                 return 8UL;
163         }
164
165         return 0;
166 }
167
168 static inline unsigned int siu_check_type(struct uart_port *port)
169 {
170         if (port->line == 0)
171                 return PORT_VR41XX_SIU;
172         if (port->line == 1 && port->irq != -1)
173                 return PORT_VR41XX_DSIU;
174
175         return PORT_UNKNOWN;
176 }
177
178 static inline const char *siu_type_name(struct uart_port *port)
179 {
180         switch (port->type) {
181         case PORT_VR41XX_SIU:
182                 return "SIU";
183         case PORT_VR41XX_DSIU:
184                 return "DSIU";
185         }
186
187         return NULL;
188 }
189
190 static unsigned int siu_tx_empty(struct uart_port *port)
191 {
192         uint8_t lsr;
193
194         lsr = siu_read(port, UART_LSR);
195         if (lsr & UART_LSR_TEMT)
196                 return TIOCSER_TEMT;
197
198         return 0;
199 }
200
201 static void siu_set_mctrl(struct uart_port *port, unsigned int mctrl)
202 {
203         uint8_t mcr = 0;
204
205         if (mctrl & TIOCM_DTR)
206                 mcr |= UART_MCR_DTR;
207         if (mctrl & TIOCM_RTS)
208                 mcr |= UART_MCR_RTS;
209         if (mctrl & TIOCM_OUT1)
210                 mcr |= UART_MCR_OUT1;
211         if (mctrl & TIOCM_OUT2)
212                 mcr |= UART_MCR_OUT2;
213         if (mctrl & TIOCM_LOOP)
214                 mcr |= UART_MCR_LOOP;
215
216         siu_write(port, UART_MCR, mcr);
217 }
218
219 static unsigned int siu_get_mctrl(struct uart_port *port)
220 {
221         uint8_t msr;
222         unsigned int mctrl = 0;
223
224         msr = siu_read(port, UART_MSR);
225         if (msr & UART_MSR_DCD)
226                 mctrl |= TIOCM_CAR;
227         if (msr & UART_MSR_RI)
228                 mctrl |= TIOCM_RNG;
229         if (msr & UART_MSR_DSR)
230                 mctrl |= TIOCM_DSR;
231         if (msr & UART_MSR_CTS)
232                 mctrl |= TIOCM_CTS;
233
234         return mctrl;
235 }
236
237 static void siu_stop_tx(struct uart_port *port)
238 {
239         unsigned long flags;
240         uint8_t ier;
241
242         spin_lock_irqsave(&port->lock, flags);
243
244         ier = siu_read(port, UART_IER);
245         ier &= ~UART_IER_THRI;
246         siu_write(port, UART_IER, ier);
247
248         spin_unlock_irqrestore(&port->lock, flags);
249 }
250
251 static void siu_start_tx(struct uart_port *port)
252 {
253         unsigned long flags;
254         uint8_t ier;
255
256         spin_lock_irqsave(&port->lock, flags);
257
258         ier = siu_read(port, UART_IER);
259         ier |= UART_IER_THRI;
260         siu_write(port, UART_IER, ier);
261
262         spin_unlock_irqrestore(&port->lock, flags);
263 }
264
265 static void siu_stop_rx(struct uart_port *port)
266 {
267         unsigned long flags;
268         uint8_t ier;
269
270         spin_lock_irqsave(&port->lock, flags);
271
272         ier = siu_read(port, UART_IER);
273         ier &= ~UART_IER_RLSI;
274         siu_write(port, UART_IER, ier);
275
276         port->read_status_mask &= ~UART_LSR_DR;
277
278         spin_unlock_irqrestore(&port->lock, flags);
279 }
280
281 static void siu_enable_ms(struct uart_port *port)
282 {
283         unsigned long flags;
284         uint8_t ier;
285
286         spin_lock_irqsave(&port->lock, flags);
287
288         ier = siu_read(port, UART_IER);
289         ier |= UART_IER_MSI;
290         siu_write(port, UART_IER, ier);
291
292         spin_unlock_irqrestore(&port->lock, flags);
293 }
294
295 static void siu_break_ctl(struct uart_port *port, int ctl)
296 {
297         unsigned long flags;
298         uint8_t lcr;
299
300         spin_lock_irqsave(&port->lock, flags);
301
302         lcr = siu_read(port, UART_LCR);
303         if (ctl == -1)
304                 lcr |= UART_LCR_SBC;
305         else
306                 lcr &= ~UART_LCR_SBC;
307         siu_write(port, UART_LCR, lcr);
308
309         spin_unlock_irqrestore(&port->lock, flags);
310 }
311
312 static inline void receive_chars(struct uart_port *port, uint8_t *status)
313 {
314         struct tty_struct *tty;
315         uint8_t lsr, ch;
316         char flag;
317         int max_count = RX_MAX_COUNT;
318
319         tty = port->info->tty;
320         lsr = *status;
321
322         do {
323                 ch = siu_read(port, UART_RX);
324                 port->icount.rx++;
325                 flag = TTY_NORMAL;
326
327 #ifdef CONFIG_SERIAL_VR41XX_CONSOLE
328                 lsr |= lsr_break_flag[port->line];
329                 lsr_break_flag[port->line] = 0;
330 #endif
331                 if (unlikely(lsr & (UART_LSR_BI | UART_LSR_FE |
332                                     UART_LSR_PE | UART_LSR_OE))) {
333                         if (lsr & UART_LSR_BI) {
334                                 lsr &= ~(UART_LSR_FE | UART_LSR_PE);
335                                 port->icount.brk++;
336
337                                 if (uart_handle_break(port))
338                                         goto ignore_char;
339                         }
340
341                         if (lsr & UART_LSR_FE)
342                                 port->icount.frame++;
343                         if (lsr & UART_LSR_PE)
344                                 port->icount.parity++;
345                         if (lsr & UART_LSR_OE)
346                                 port->icount.overrun++;
347
348                         lsr &= port->read_status_mask;
349                         if (lsr & UART_LSR_BI)
350                                 flag = TTY_BREAK;
351                         if (lsr & UART_LSR_FE)
352                                 flag = TTY_FRAME;
353                         if (lsr & UART_LSR_PE)
354                                 flag = TTY_PARITY;
355                 }
356
357                 if (uart_handle_sysrq_char(port, ch))
358                         goto ignore_char;
359
360                 uart_insert_char(port, lsr, UART_LSR_OE, ch, flag);
361
362         ignore_char:
363                 lsr = siu_read(port, UART_LSR);
364         } while ((lsr & UART_LSR_DR) && (max_count-- > 0));
365
366         tty_flip_buffer_push(tty);
367
368         *status = lsr;
369 }
370
371 static inline void check_modem_status(struct uart_port *port)
372 {
373         uint8_t msr;
374
375         msr = siu_read(port, UART_MSR);
376         if ((msr & UART_MSR_ANY_DELTA) == 0)
377                 return;
378         if (msr & UART_MSR_DDCD)
379                 uart_handle_dcd_change(port, msr & UART_MSR_DCD);
380         if (msr & UART_MSR_TERI)
381                 port->icount.rng++;
382         if (msr & UART_MSR_DDSR)
383                 port->icount.dsr++;
384         if (msr & UART_MSR_DCTS)
385                 uart_handle_cts_change(port, msr & UART_MSR_CTS);
386
387         wake_up_interruptible(&port->info->delta_msr_wait);
388 }
389
390 static inline void transmit_chars(struct uart_port *port)
391 {
392         struct circ_buf *xmit;
393         int max_count = TX_MAX_COUNT;
394
395         xmit = &port->info->xmit;
396
397         if (port->x_char) {
398                 siu_write(port, UART_TX, port->x_char);
399                 port->icount.tx++;
400                 port->x_char = 0;
401                 return;
402         }
403
404         if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
405                 siu_stop_tx(port);
406                 return;
407         }
408
409         do {
410                 siu_write(port, UART_TX, xmit->buf[xmit->tail]);
411                 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
412                 port->icount.tx++;
413                 if (uart_circ_empty(xmit))
414                         break;
415         } while (max_count-- > 0);
416
417         if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
418                 uart_write_wakeup(port);
419
420         if (uart_circ_empty(xmit))
421                 siu_stop_tx(port);
422 }
423
424 static irqreturn_t siu_interrupt(int irq, void *dev_id)
425 {
426         struct uart_port *port;
427         uint8_t iir, lsr;
428
429         port = (struct uart_port *)dev_id;
430
431         iir = siu_read(port, UART_IIR);
432         if (iir & UART_IIR_NO_INT)
433                 return IRQ_NONE;
434
435         lsr = siu_read(port, UART_LSR);
436         if (lsr & UART_LSR_DR)
437                 receive_chars(port, &lsr);
438
439         check_modem_status(port);
440
441         if (lsr & UART_LSR_THRE)
442                 transmit_chars(port);
443
444         return IRQ_HANDLED;
445 }
446
447 static int siu_startup(struct uart_port *port)
448 {
449         int retval;
450
451         if (port->membase == NULL)
452                 return -ENODEV;
453
454         siu_clear_fifo(port);
455
456         (void)siu_read(port, UART_LSR);
457         (void)siu_read(port, UART_RX);
458         (void)siu_read(port, UART_IIR);
459         (void)siu_read(port, UART_MSR);
460
461         if (siu_read(port, UART_LSR) == 0xff)
462                 return -ENODEV;
463
464         retval = request_irq(port->irq, siu_interrupt, 0, siu_type_name(port), port);
465         if (retval)
466                 return retval;
467
468         if (port->type == PORT_VR41XX_DSIU)
469                 vr41xx_enable_dsiuint(DSIUINT_ALL);
470
471         siu_write(port, UART_LCR, UART_LCR_WLEN8);
472
473         spin_lock_irq(&port->lock);
474         siu_set_mctrl(port, port->mctrl);
475         spin_unlock_irq(&port->lock);
476
477         siu_write(port, UART_IER, UART_IER_RLSI | UART_IER_RDI);
478
479         (void)siu_read(port, UART_LSR);
480         (void)siu_read(port, UART_RX);
481         (void)siu_read(port, UART_IIR);
482         (void)siu_read(port, UART_MSR);
483
484         return 0;
485 }
486
487 static void siu_shutdown(struct uart_port *port)
488 {
489         unsigned long flags;
490         uint8_t lcr;
491
492         siu_write(port, UART_IER, 0);
493
494         spin_lock_irqsave(&port->lock, flags);
495
496         port->mctrl &= ~TIOCM_OUT2;
497         siu_set_mctrl(port, port->mctrl);
498
499         spin_unlock_irqrestore(&port->lock, flags);
500
501         lcr = siu_read(port, UART_LCR);
502         lcr &= ~UART_LCR_SBC;
503         siu_write(port, UART_LCR, lcr);
504
505         siu_clear_fifo(port);
506
507         (void)siu_read(port, UART_RX);
508
509         if (port->type == PORT_VR41XX_DSIU)
510                 vr41xx_disable_dsiuint(DSIUINT_ALL);
511
512         free_irq(port->irq, port);
513 }
514
515 static void siu_set_termios(struct uart_port *port, struct ktermios *new,
516                             struct ktermios *old)
517 {
518         tcflag_t c_cflag, c_iflag;
519         uint8_t lcr, fcr, ier;
520         unsigned int baud, quot;
521         unsigned long flags;
522
523         c_cflag = new->c_cflag;
524         switch (c_cflag & CSIZE) {
525         case CS5:
526                 lcr = UART_LCR_WLEN5;
527                 break;
528         case CS6:
529                 lcr = UART_LCR_WLEN6;
530                 break;
531         case CS7:
532                 lcr = UART_LCR_WLEN7;
533                 break;
534         default:
535                 lcr = UART_LCR_WLEN8;
536                 break;
537         }
538
539         if (c_cflag & CSTOPB)
540                 lcr |= UART_LCR_STOP;
541         if (c_cflag & PARENB)
542                 lcr |= UART_LCR_PARITY;
543         if ((c_cflag & PARODD) != PARODD)
544                 lcr |= UART_LCR_EPAR;
545         if (c_cflag & CMSPAR)
546                 lcr |= UART_LCR_SPAR;
547
548         baud = uart_get_baud_rate(port, new, old, 0, port->uartclk/16);
549         quot = uart_get_divisor(port, baud);
550
551         fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10;
552
553         spin_lock_irqsave(&port->lock, flags);
554
555         uart_update_timeout(port, c_cflag, baud);
556
557         c_iflag = new->c_iflag;
558
559         port->read_status_mask = UART_LSR_THRE | UART_LSR_OE | UART_LSR_DR;
560         if (c_iflag & INPCK)
561                 port->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
562         if (c_iflag & (BRKINT | PARMRK))
563                 port->read_status_mask |= UART_LSR_BI;
564
565         port->ignore_status_mask = 0;
566         if (c_iflag & IGNPAR)
567                 port->ignore_status_mask |= UART_LSR_FE | UART_LSR_PE;
568         if (c_iflag & IGNBRK) {
569                 port->ignore_status_mask |= UART_LSR_BI;
570                 if (c_iflag & IGNPAR)
571                         port->ignore_status_mask |= UART_LSR_OE;
572         }
573
574         if ((c_cflag & CREAD) == 0)
575                 port->ignore_status_mask |= UART_LSR_DR;
576
577         ier = siu_read(port, UART_IER);
578         ier &= ~UART_IER_MSI;
579         if (UART_ENABLE_MS(port, c_cflag))
580                 ier |= UART_IER_MSI;
581         siu_write(port, UART_IER, ier);
582
583         siu_write(port, UART_LCR, lcr | UART_LCR_DLAB);
584
585         siu_write(port, UART_DLL, (uint8_t)quot);
586         siu_write(port, UART_DLM, (uint8_t)(quot >> 8));
587
588         siu_write(port, UART_LCR, lcr);
589
590         siu_write(port, UART_FCR, fcr);
591
592         siu_set_mctrl(port, port->mctrl);
593
594         spin_unlock_irqrestore(&port->lock, flags);
595 }
596
597 static void siu_pm(struct uart_port *port, unsigned int state, unsigned int oldstate)
598 {
599         switch (state) {
600         case 0:
601                 switch (port->type) {
602                 case PORT_VR41XX_SIU:
603                         vr41xx_supply_clock(SIU_CLOCK);
604                         break;
605                 case PORT_VR41XX_DSIU:
606                         vr41xx_supply_clock(DSIU_CLOCK);
607                         break;
608                 }
609                 break;
610         case 3:
611                 switch (port->type) {
612                 case PORT_VR41XX_SIU:
613                         vr41xx_mask_clock(SIU_CLOCK);
614                         break;
615                 case PORT_VR41XX_DSIU:
616                         vr41xx_mask_clock(DSIU_CLOCK);
617                         break;
618                 }
619                 break;
620         }
621 }
622
623 static const char *siu_type(struct uart_port *port)
624 {
625         return siu_type_name(port);
626 }
627
628 static void siu_release_port(struct uart_port *port)
629 {
630         unsigned long size;
631
632         if (port->flags & UPF_IOREMAP) {
633                 iounmap(port->membase);
634                 port->membase = NULL;
635         }
636
637         size = siu_port_size(port);
638         release_mem_region(port->mapbase, size);
639 }
640
641 static int siu_request_port(struct uart_port *port)
642 {
643         unsigned long size;
644         struct resource *res;
645
646         size = siu_port_size(port);
647         res = request_mem_region(port->mapbase, size, siu_type_name(port));
648         if (res == NULL)
649                 return -EBUSY;
650
651         if (port->flags & UPF_IOREMAP) {
652                 port->membase = ioremap(port->mapbase, size);
653                 if (port->membase == NULL) {
654                         release_resource(res);
655                         return -ENOMEM;
656                 }
657         }
658
659         return 0;
660 }
661
662 static void siu_config_port(struct uart_port *port, int flags)
663 {
664         if (flags & UART_CONFIG_TYPE) {
665                 port->type = siu_check_type(port);
666                 (void)siu_request_port(port);
667         }
668 }
669
670 static int siu_verify_port(struct uart_port *port, struct serial_struct *serial)
671 {
672         if (port->type != PORT_VR41XX_SIU && port->type != PORT_VR41XX_DSIU)
673                 return -EINVAL;
674         if (port->irq != serial->irq)
675                 return -EINVAL;
676         if (port->iotype != serial->io_type)
677                 return -EINVAL;
678         if (port->mapbase != (unsigned long)serial->iomem_base)
679                 return -EINVAL;
680
681         return 0;
682 }
683
684 static struct uart_ops siu_uart_ops = {
685         .tx_empty       = siu_tx_empty,
686         .set_mctrl      = siu_set_mctrl,
687         .get_mctrl      = siu_get_mctrl,
688         .stop_tx        = siu_stop_tx,
689         .start_tx       = siu_start_tx,
690         .stop_rx        = siu_stop_rx,
691         .enable_ms      = siu_enable_ms,
692         .break_ctl      = siu_break_ctl,
693         .startup        = siu_startup,
694         .shutdown       = siu_shutdown,
695         .set_termios    = siu_set_termios,
696         .pm             = siu_pm,
697         .type           = siu_type,
698         .release_port   = siu_release_port,
699         .request_port   = siu_request_port,
700         .config_port    = siu_config_port,
701         .verify_port    = siu_verify_port,
702 };
703
704 static int siu_init_ports(struct platform_device *pdev)
705 {
706         struct uart_port *port;
707         struct resource *res;
708         int *type = pdev->dev.platform_data;
709         int i;
710
711         if (!type)
712                 return 0;
713
714         port = siu_uart_ports;
715         for (i = 0; i < SIU_PORTS_MAX; i++) {
716                 port->type = type[i];
717                 if (port->type == PORT_UNKNOWN)
718                         continue;
719                 port->irq = platform_get_irq(pdev, i);
720                 port->uartclk = SIU_BAUD_BASE * 16;
721                 port->fifosize = 16;
722                 port->regshift = 0;
723                 port->iotype = UPIO_MEM;
724                 port->flags = UPF_IOREMAP | UPF_BOOT_AUTOCONF;
725                 port->line = i;
726                 res = platform_get_resource(pdev, IORESOURCE_MEM, i);
727                 port->mapbase = res->start;
728                 port++;
729         }
730
731         return i;
732 }
733
734 #ifdef CONFIG_SERIAL_VR41XX_CONSOLE
735
736 #define BOTH_EMPTY      (UART_LSR_TEMT | UART_LSR_THRE)
737
738 static void wait_for_xmitr(struct uart_port *port)
739 {
740         int timeout = 10000;
741         uint8_t lsr, msr;
742
743         do {
744                 lsr = siu_read(port, UART_LSR);
745                 if (lsr & UART_LSR_BI)
746                         lsr_break_flag[port->line] = UART_LSR_BI;
747
748                 if ((lsr & BOTH_EMPTY) == BOTH_EMPTY)
749                         break;
750         } while (timeout-- > 0);
751
752         if (port->flags & UPF_CONS_FLOW) {
753                 timeout = 1000000;
754
755                 do {
756                         msr = siu_read(port, UART_MSR);
757                         if ((msr & UART_MSR_CTS) != 0)
758                                 break;
759                 } while (timeout-- > 0);
760         }
761 }
762
763 static void siu_console_putchar(struct uart_port *port, int ch)
764 {
765         wait_for_xmitr(port);
766         siu_write(port, UART_TX, ch);
767 }
768
769 static void siu_console_write(struct console *con, const char *s, unsigned count)
770 {
771         struct uart_port *port;
772         uint8_t ier;
773
774         port = &siu_uart_ports[con->index];
775
776         ier = siu_read(port, UART_IER);
777         siu_write(port, UART_IER, 0);
778
779         uart_console_write(port, s, count, siu_console_putchar);
780
781         wait_for_xmitr(port);
782         siu_write(port, UART_IER, ier);
783 }
784
785 static int siu_console_setup(struct console *con, char *options)
786 {
787         struct uart_port *port;
788         int baud = 9600;
789         int parity = 'n';
790         int bits = 8;
791         int flow = 'n';
792
793         if (con->index >= SIU_PORTS_MAX)
794                 con->index = 0;
795
796         port = &siu_uart_ports[con->index];
797         if (port->membase == NULL) {
798                 if (port->mapbase == 0)
799                         return -ENODEV;
800                 port->membase = ioremap(port->mapbase, siu_port_size(port));
801         }
802
803         vr41xx_select_siu_interface(SIU_INTERFACE_RS232C);
804
805         if (options != NULL)
806                 uart_parse_options(options, &baud, &parity, &bits, &flow);
807
808         return uart_set_options(port, con, baud, parity, bits, flow);
809 }
810
811 static struct uart_driver siu_uart_driver;
812
813 static struct console siu_console = {
814         .name   = "ttyVR",
815         .write  = siu_console_write,
816         .device = uart_console_device,
817         .setup  = siu_console_setup,
818         .flags  = CON_PRINTBUFFER,
819         .index  = -1,
820         .data   = &siu_uart_driver,
821 };
822
823 static int __devinit siu_console_init(void)
824 {
825         struct uart_port *port;
826         int i;
827
828         for (i = 0; i < SIU_PORTS_MAX; i++) {
829                 port = &siu_uart_ports[i];
830                 port->ops = &siu_uart_ops;
831         }
832
833         register_console(&siu_console);
834
835         return 0;
836 }
837
838 console_initcall(siu_console_init);
839
840 #define SERIAL_VR41XX_CONSOLE   &siu_console
841 #else
842 #define SERIAL_VR41XX_CONSOLE   NULL
843 #endif
844
845 static struct uart_driver siu_uart_driver = {
846         .owner          = THIS_MODULE,
847         .driver_name    = "SIU",
848         .dev_name       = "ttyVR",
849         .major          = SIU_MAJOR,
850         .minor          = SIU_MINOR_BASE,
851         .cons           = SERIAL_VR41XX_CONSOLE,
852 };
853
854 static int __devinit siu_probe(struct platform_device *dev)
855 {
856         struct uart_port *port;
857         int num, i, retval;
858
859         num = siu_init_ports(dev);
860         if (num <= 0)
861                 return -ENODEV;
862
863         siu_uart_driver.nr = num;
864         retval = uart_register_driver(&siu_uart_driver);
865         if (retval)
866                 return retval;
867
868         for (i = 0; i < num; i++) {
869                 port = &siu_uart_ports[i];
870                 port->ops = &siu_uart_ops;
871                 port->dev = &dev->dev;
872
873                 retval = uart_add_one_port(&siu_uart_driver, port);
874                 if (retval < 0) {
875                         port->dev = NULL;
876                         break;
877                 }
878         }
879
880         if (i == 0 && retval < 0) {
881                 uart_unregister_driver(&siu_uart_driver);
882                 return retval;
883         }
884
885         return 0;
886 }
887
888 static int __devexit siu_remove(struct platform_device *dev)
889 {
890         struct uart_port *port;
891         int i;
892
893         for (i = 0; i < siu_uart_driver.nr; i++) {
894                 port = &siu_uart_ports[i];
895                 if (port->dev == &dev->dev) {
896                         uart_remove_one_port(&siu_uart_driver, port);
897                         port->dev = NULL;
898                 }
899         }
900
901         uart_unregister_driver(&siu_uart_driver);
902
903         return 0;
904 }
905
906 static int siu_suspend(struct platform_device *dev, pm_message_t state)
907 {
908         struct uart_port *port;
909         int i;
910
911         for (i = 0; i < siu_uart_driver.nr; i++) {
912                 port = &siu_uart_ports[i];
913                 if ((port->type == PORT_VR41XX_SIU ||
914                      port->type == PORT_VR41XX_DSIU) && port->dev == &dev->dev)
915                         uart_suspend_port(&siu_uart_driver, port);
916
917         }
918
919         return 0;
920 }
921
922 static int siu_resume(struct platform_device *dev)
923 {
924         struct uart_port *port;
925         int i;
926
927         for (i = 0; i < siu_uart_driver.nr; i++) {
928                 port = &siu_uart_ports[i];
929                 if ((port->type == PORT_VR41XX_SIU ||
930                      port->type == PORT_VR41XX_DSIU) && port->dev == &dev->dev)
931                         uart_resume_port(&siu_uart_driver, port);
932         }
933
934         return 0;
935 }
936
937 static struct platform_driver siu_device_driver = {
938         .probe          = siu_probe,
939         .remove         = __devexit_p(siu_remove),
940         .suspend        = siu_suspend,
941         .resume         = siu_resume,
942         .driver         = {
943                 .name   = "SIU",
944                 .owner  = THIS_MODULE,
945         },
946 };
947
948 static int __init vr41xx_siu_init(void)
949 {
950         return platform_driver_register(&siu_device_driver);
951 }
952
953 static void __exit vr41xx_siu_exit(void)
954 {
955         platform_driver_unregister(&siu_device_driver);
956 }
957
958 module_init(vr41xx_siu_init);
959 module_exit(vr41xx_siu_exit);