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path: root/drivers/serial/vr41xx_siu.c
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-rw-r--r--drivers/serial/vr41xx_siu.c1100
1 files changed, 1100 insertions, 0 deletions
diff --git a/drivers/serial/vr41xx_siu.c b/drivers/serial/vr41xx_siu.c
new file mode 100644
index 000000000000..ebc59c27a85c
--- /dev/null
+++ b/drivers/serial/vr41xx_siu.c
@@ -0,0 +1,1100 @@
1/*
2 * Driver for NEC VR4100 series Serial Interface Unit.
3 *
4 * Copyright (C) 2004-2005 Yoichi Yuasa <yuasa@hh.iij4u.or.jp>
5 *
6 * Based on drivers/serial/8250.c, by Russell King.
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 */
22#include <linux/config.h>
23
24#if defined(CONFIG_SERIAL_VR41XX_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
25#define SUPPORT_SYSRQ
26#endif
27
28#include <linux/console.h>
29#include <linux/device.h>
30#include <linux/err.h>
31#include <linux/ioport.h>
32#include <linux/init.h>
33#include <linux/interrupt.h>
34#include <linux/module.h>
35#include <linux/serial.h>
36#include <linux/serial_core.h>
37#include <linux/serial_reg.h>
38#include <linux/tty.h>
39#include <linux/tty_flip.h>
40
41#include <asm/io.h>
42#include <asm/vr41xx/siu.h>
43#include <asm/vr41xx/vr41xx.h>
44
45#define SIU_PORTS_MAX 2
46#define SIU_BAUD_BASE 1152000
47#define SIU_MAJOR 204
48#define SIU_MINOR_BASE 82
49
50#define RX_MAX_COUNT 256
51#define TX_MAX_COUNT 15
52
53#define SIUIRSEL 0x08
54 #define TMICMODE 0x20
55 #define TMICTX 0x10
56 #define IRMSEL 0x0c
57 #define IRMSEL_HP 0x08
58 #define IRMSEL_TEMIC 0x04
59 #define IRMSEL_SHARP 0x00
60 #define IRUSESEL 0x02
61 #define SIRSEL 0x01
62
63struct siu_port {
64 unsigned int type;
65 unsigned int irq;
66 unsigned long start;
67};
68
69static 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
77static 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
88static struct uart_port siu_uart_ports[SIU_PORTS_MAX];
89static 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
94void 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
114EXPORT_SYMBOL_GPL(vr41xx_select_siu_interface);
115
116void 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
136EXPORT_SYMBOL_GPL(vr41xx_use_irda);
137
138void 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
170EXPORT_SYMBOL_GPL(vr41xx_select_irda_module);
171
172static 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
180static 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
195static 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
207static 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
228static 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 "unknown";
238}
239
240static 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
251static 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
269static 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
287static void siu_stop_tx(struct uart_port *port, unsigned int tty_stop)
288{
289 unsigned long flags;
290 uint8_t ier;
291
292 spin_lock_irqsave(&port->lock, flags);
293
294 ier = siu_read(port, UART_IER);
295 ier &= ~UART_IER_THRI;
296 siu_write(port, UART_IER, ier);
297
298 spin_unlock_irqrestore(&port->lock, flags);
299}
300
301static void siu_start_tx(struct uart_port *port, unsigned int tty_start)
302{
303 unsigned long flags;
304 uint8_t ier;
305
306 spin_lock_irqsave(&port->lock, flags);
307
308 ier = siu_read(port, UART_IER);
309 ier |= UART_IER_THRI;
310 siu_write(port, UART_IER, ier);
311
312 spin_unlock_irqrestore(&port->lock, flags);
313}
314
315static 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
331static 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
345static 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
362static 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 if ((lsr & port->ignore_status_mask) == 0)
416 tty_insert_flip_char(tty, ch, flag);
417 if ((lsr & UART_LSR_OE) && (tty->flip.count < TTY_FLIPBUF_SIZE))
418 tty_insert_flip_char(tty, 0, TTY_OVERRUN);
419
420 ignore_char:
421 lsr = siu_read(port, UART_LSR);
422 } while ((lsr & UART_LSR_DR) && (max_count-- > 0));
423
424 tty_flip_buffer_push(tty);
425
426 *status = lsr;
427}
428
429static inline void check_modem_status(struct uart_port *port)
430{
431 uint8_t msr;
432
433 msr = siu_read(port, UART_MSR);
434 if ((msr & UART_MSR_ANY_DELTA) == 0)
435 return;
436 if (msr & UART_MSR_DDCD)
437 uart_handle_dcd_change(port, msr & UART_MSR_DCD);
438 if (msr & UART_MSR_TERI)
439 port->icount.rng++;
440 if (msr & UART_MSR_DDSR)
441 port->icount.dsr++;
442 if (msr & UART_MSR_DCTS)
443 uart_handle_cts_change(port, msr & UART_MSR_CTS);
444
445 wake_up_interruptible(&port->info->delta_msr_wait);
446}
447
448static inline void transmit_chars(struct uart_port *port)
449{
450 struct circ_buf *xmit;
451 int max_count = TX_MAX_COUNT;
452
453 xmit = &port->info->xmit;
454
455 if (port->x_char) {
456 siu_write(port, UART_TX, port->x_char);
457 port->icount.tx++;
458 port->x_char = 0;
459 return;
460 }
461
462 if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
463 siu_stop_tx(port, 0);
464 return;
465 }
466
467 do {
468 siu_write(port, UART_TX, xmit->buf[xmit->tail]);
469 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
470 port->icount.tx++;
471 if (uart_circ_empty(xmit))
472 break;
473 } while (max_count-- > 0);
474
475 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
476 uart_write_wakeup(port);
477
478 if (uart_circ_empty(xmit))
479 siu_stop_tx(port, 0);
480}
481
482static irqreturn_t siu_interrupt(int irq, void *dev_id, struct pt_regs *regs)
483{
484 struct uart_port *port;
485 uint8_t iir, lsr;
486
487 if (dev_id == NULL)
488 return IRQ_NONE;
489
490 port = (struct uart_port *)dev_id;
491
492 iir = siu_read(port, UART_IIR);
493 if (iir & UART_IIR_NO_INT)
494 return IRQ_NONE;
495
496 lsr = siu_read(port, UART_LSR);
497 if (lsr & UART_LSR_DR)
498 receive_chars(port, &lsr, regs);
499
500 check_modem_status(port);
501
502 if (lsr & UART_LSR_THRE)
503 transmit_chars(port);
504
505 return IRQ_HANDLED;
506}
507
508static int siu_startup(struct uart_port *port)
509{
510 int retval;
511
512 siu_clear_fifo(port);
513
514 (void)siu_read(port, UART_LSR);
515 (void)siu_read(port, UART_RX);
516 (void)siu_read(port, UART_IIR);
517 (void)siu_read(port, UART_MSR);
518
519 if (siu_read(port, UART_LSR) == 0xff)
520 return -ENODEV;
521
522 retval = request_irq(port->irq, siu_interrupt, 0, siu_type_name(port), port);
523 if (retval)
524 return retval;
525
526 if (port->type == PORT_VR41XX_DSIU)
527 vr41xx_enable_dsiuint(DSIUINT_ALL);
528
529 siu_write(port, UART_LCR, UART_LCR_WLEN8);
530
531 spin_lock_irq(&port->lock);
532 siu_set_mctrl(port, port->mctrl);
533 spin_unlock_irq(&port->lock);
534
535 siu_write(port, UART_IER, UART_IER_RLSI | UART_IER_RDI);
536
537 (void)siu_read(port, UART_LSR);
538 (void)siu_read(port, UART_RX);
539 (void)siu_read(port, UART_IIR);
540 (void)siu_read(port, UART_MSR);
541
542 return 0;
543}
544
545static void siu_shutdown(struct uart_port *port)
546{
547 unsigned long flags;
548 uint8_t lcr;
549
550 if (port->membase == NULL)
551 return;
552
553 siu_write(port, UART_IER, 0);
554
555 spin_lock_irqsave(&port->lock, flags);
556
557 port->mctrl &= ~TIOCM_OUT2;
558 siu_set_mctrl(port, port->mctrl);
559
560 spin_unlock_irqrestore(&port->lock, flags);
561
562 lcr = siu_read(port, UART_LCR);
563 lcr &= ~UART_LCR_SBC;
564 siu_write(port, UART_LCR, lcr);
565
566 siu_clear_fifo(port);
567
568 (void)siu_read(port, UART_RX);
569
570 if (port->type == PORT_VR41XX_DSIU)
571 vr41xx_disable_dsiuint(DSIUINT_ALL);
572
573 free_irq(port->irq, port);
574}
575
576static void siu_set_termios(struct uart_port *port, struct termios *new,
577 struct termios *old)
578{
579 tcflag_t c_cflag, c_iflag;
580 uint8_t lcr, fcr, ier;
581 unsigned int baud, quot;
582 unsigned long flags;
583
584 c_cflag = new->c_cflag;
585 switch (c_cflag & CSIZE) {
586 case CS5:
587 lcr = UART_LCR_WLEN5;
588 break;
589 case CS6:
590 lcr = UART_LCR_WLEN6;
591 break;
592 case CS7:
593 lcr = UART_LCR_WLEN7;
594 break;
595 default:
596 lcr = UART_LCR_WLEN8;
597 break;
598 }
599
600 if (c_cflag & CSTOPB)
601 lcr |= UART_LCR_STOP;
602 if (c_cflag & PARENB)
603 lcr |= UART_LCR_PARITY;
604 if ((c_cflag & PARODD) != PARODD)
605 lcr |= UART_LCR_EPAR;
606 if (c_cflag & CMSPAR)
607 lcr |= UART_LCR_SPAR;
608
609 baud = uart_get_baud_rate(port, new, old, 0, port->uartclk/16);
610 quot = uart_get_divisor(port, baud);
611
612 fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10;
613
614 spin_lock_irqsave(&port->lock, flags);
615
616 uart_update_timeout(port, c_cflag, baud);
617
618 c_iflag = new->c_iflag;
619
620 port->read_status_mask = UART_LSR_THRE | UART_LSR_OE | UART_LSR_DR;
621 if (c_iflag & INPCK)
622 port->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
623 if (c_iflag & (BRKINT | PARMRK))
624 port->read_status_mask |= UART_LSR_BI;
625
626 port->ignore_status_mask = 0;
627 if (c_iflag & IGNPAR)
628 port->ignore_status_mask |= UART_LSR_FE | UART_LSR_PE;
629 if (c_iflag & IGNBRK) {
630 port->ignore_status_mask |= UART_LSR_BI;
631 if (c_iflag & IGNPAR)
632 port->ignore_status_mask |= UART_LSR_OE;
633 }
634
635 if ((c_cflag & CREAD) == 0)
636 port->ignore_status_mask |= UART_LSR_DR;
637
638 ier = siu_read(port, UART_IER);
639 ier &= ~UART_IER_MSI;
640 if (UART_ENABLE_MS(port, c_cflag))
641 ier |= UART_IER_MSI;
642 siu_write(port, UART_IER, ier);
643
644 siu_write(port, UART_LCR, lcr | UART_LCR_DLAB);
645
646 siu_write(port, UART_DLL, (uint8_t)quot);
647 siu_write(port, UART_DLM, (uint8_t)(quot >> 8));
648
649 siu_write(port, UART_LCR, lcr);
650
651 siu_write(port, UART_FCR, fcr);
652
653 siu_set_mctrl(port, port->mctrl);
654
655 spin_unlock_irqrestore(&port->lock, flags);
656}
657
658static void siu_pm(struct uart_port *port, unsigned int state, unsigned int oldstate)
659{
660 switch (state) {
661 case 0:
662 switch (port->type) {
663 case PORT_VR41XX_SIU:
664 vr41xx_supply_clock(SIU_CLOCK);
665 break;
666 case PORT_VR41XX_DSIU:
667 vr41xx_supply_clock(DSIU_CLOCK);
668 break;
669 }
670 break;
671 case 3:
672 switch (port->type) {
673 case PORT_VR41XX_SIU:
674 vr41xx_mask_clock(SIU_CLOCK);
675 break;
676 case PORT_VR41XX_DSIU:
677 vr41xx_mask_clock(DSIU_CLOCK);
678 break;
679 }
680 break;
681 }
682}
683
684static const char *siu_type(struct uart_port *port)
685{
686 return siu_type_name(port);
687}
688
689static void siu_release_port(struct uart_port *port)
690{
691 unsigned long size;
692
693 if (port->flags & UPF_IOREMAP) {
694 iounmap(port->membase);
695 port->membase = NULL;
696 }
697
698 size = siu_port_size(port);
699 release_mem_region(port->mapbase, size);
700}
701
702static int siu_request_port(struct uart_port *port)
703{
704 unsigned long size;
705 struct resource *res;
706
707 size = siu_port_size(port);
708 res = request_mem_region(port->mapbase, size, siu_type_name(port));
709 if (res == NULL)
710 return -EBUSY;
711
712 if (port->flags & UPF_IOREMAP) {
713 port->membase = ioremap(port->mapbase, size);
714 if (port->membase == NULL) {
715 release_resource(res);
716 return -ENOMEM;
717 }
718 }
719
720 return 0;
721}
722
723static void siu_config_port(struct uart_port *port, int flags)
724{
725 if (flags & UART_CONFIG_TYPE) {
726 port->type = siu_check_type(port);
727 (void)siu_request_port(port);
728 }
729}
730
731static int siu_verify_port(struct uart_port *port, struct serial_struct *serial)
732{
733 if (port->type != PORT_VR41XX_SIU && port->type != PORT_VR41XX_DSIU)
734 return -EINVAL;
735 if (port->irq != serial->irq)
736 return -EINVAL;
737 if (port->iotype != serial->io_type)
738 return -EINVAL;
739 if (port->mapbase != (unsigned long)serial->iomem_base)
740 return -EINVAL;
741
742 return 0;
743}
744
745static struct uart_ops siu_uart_ops = {
746 .tx_empty = siu_tx_empty,
747 .set_mctrl = siu_set_mctrl,
748 .get_mctrl = siu_get_mctrl,
749 .stop_tx = siu_stop_tx,
750 .start_tx = siu_start_tx,
751 .stop_rx = siu_stop_rx,
752 .enable_ms = siu_enable_ms,
753 .break_ctl = siu_break_ctl,
754 .startup = siu_startup,
755 .shutdown = siu_shutdown,
756 .set_termios = siu_set_termios,
757 .pm = siu_pm,
758 .type = siu_type,
759 .release_port = siu_release_port,
760 .request_port = siu_request_port,
761 .config_port = siu_config_port,
762 .verify_port = siu_verify_port,
763};
764
765static int siu_init_ports(void)
766{
767 const struct siu_port *siu;
768 struct uart_port *port;
769 int i, num;
770
771 switch (current_cpu_data.cputype) {
772 case CPU_VR4111:
773 case CPU_VR4121:
774 siu = siu_type1_ports;
775 break;
776 case CPU_VR4122:
777 case CPU_VR4131:
778 case CPU_VR4133:
779 siu = siu_type2_ports;
780 break;
781 default:
782 return 0;
783 }
784
785 port = siu_uart_ports;
786 num = siu_probe_ports();
787 for (i = 0; i < num; i++) {
788 spin_lock_init(&port->lock);
789 port->irq = siu->irq;
790 port->uartclk = SIU_BAUD_BASE * 16;
791 port->fifosize = 16;
792 port->regshift = 0;
793 port->iotype = UPIO_MEM;
794 port->flags = UPF_IOREMAP | UPF_BOOT_AUTOCONF;
795 port->type = siu->type;
796 port->line = i;
797 port->mapbase = siu->start;
798 siu++;
799 port++;
800 }
801
802 return num;
803}
804
805#ifdef CONFIG_SERIAL_VR41XX_CONSOLE
806
807static void early_set_termios(struct uart_port *port, struct termios *new,
808 struct termios *old)
809{
810 tcflag_t c_cflag;
811 uint8_t lcr;
812 unsigned int baud, quot;
813
814 c_cflag = new->c_cflag;
815 switch (c_cflag & CSIZE) {
816 case CS5:
817 lcr = UART_LCR_WLEN5;
818 break;
819 case CS6:
820 lcr = UART_LCR_WLEN6;
821 break;
822 case CS7:
823 lcr = UART_LCR_WLEN7;
824 break;
825 default:
826 lcr = UART_LCR_WLEN8;
827 break;
828 }
829
830 if (c_cflag & CSTOPB)
831 lcr |= UART_LCR_STOP;
832 if (c_cflag & PARENB)
833 lcr |= UART_LCR_PARITY;
834 if ((c_cflag & PARODD) != PARODD)
835 lcr |= UART_LCR_EPAR;
836 if (c_cflag & CMSPAR)
837 lcr |= UART_LCR_SPAR;
838
839 baud = uart_get_baud_rate(port, new, old, 0, port->uartclk/16);
840 quot = uart_get_divisor(port, baud);
841
842 siu_write(port, UART_LCR, lcr | UART_LCR_DLAB);
843
844 siu_write(port, UART_DLL, (uint8_t)quot);
845 siu_write(port, UART_DLM, (uint8_t)(quot >> 8));
846
847 siu_write(port, UART_LCR, lcr);
848}
849
850static struct uart_ops early_uart_ops = {
851 .set_termios = early_set_termios,
852};
853
854#define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE)
855
856static void wait_for_xmitr(struct uart_port *port)
857{
858 int timeout = 10000;
859 uint8_t lsr, msr;
860
861 do {
862 lsr = siu_read(port, UART_LSR);
863 if (lsr & UART_LSR_BI)
864 lsr_break_flag[port->line] = UART_LSR_BI;
865
866 if ((lsr & BOTH_EMPTY) == BOTH_EMPTY)
867 break;
868 } while (timeout-- > 0);
869
870 if (port->flags & UPF_CONS_FLOW) {
871 timeout = 1000000;
872
873 do {
874 msr = siu_read(port, UART_MSR);
875 if ((msr & UART_MSR_CTS) != 0)
876 break;
877 } while (timeout-- > 0);
878 }
879}
880
881static void siu_console_write(struct console *con, const char *s, unsigned count)
882{
883 struct uart_port *port;
884 uint8_t ier;
885 unsigned i;
886
887 port = &siu_uart_ports[con->index];
888
889 ier = siu_read(port, UART_IER);
890 siu_write(port, UART_IER, 0);
891
892 for (i = 0; i < count && *s != '\0'; i++, s++) {
893 wait_for_xmitr(port);
894 siu_write(port, UART_TX, *s);
895 if (*s == '\n') {
896 wait_for_xmitr(port);
897 siu_write(port, UART_TX, '\r');
898 }
899 }
900
901 wait_for_xmitr(port);
902 siu_write(port, UART_IER, ier);
903}
904
905static int siu_console_setup(struct console *con, char *options)
906{
907 struct uart_port *port;
908 int baud = 9600;
909 int parity = 'n';
910 int bits = 8;
911 int flow = 'n';
912
913 if (con->index >= SIU_PORTS_MAX)
914 con->index = 0;
915
916 port = &siu_uart_ports[con->index];
917 if (port->membase == NULL) {
918 if (port->mapbase == 0)
919 return -ENODEV;
920 port->membase = (unsigned char __iomem *)KSEG1ADDR(port->mapbase);
921 }
922
923 vr41xx_select_siu_interface(SIU_INTERFACE_RS232C);
924
925 if (options != NULL)
926 uart_parse_options(options, &baud, &parity, &bits, &flow);
927
928 return uart_set_options(port, con, baud, parity, bits, flow);
929}
930
931static struct uart_driver siu_uart_driver;
932
933static struct console siu_console = {
934 .name = "ttyVR",
935 .write = siu_console_write,
936 .device = uart_console_device,
937 .setup = siu_console_setup,
938 .flags = CON_PRINTBUFFER,
939 .index = -1,
940 .data = &siu_uart_driver,
941};
942
943static int __devinit siu_console_init(void)
944{
945 struct uart_port *port;
946 int num, i;
947
948 num = siu_init_ports();
949 if (num <= 0)
950 return -ENODEV;
951
952 for (i = 0; i < num; i++) {
953 port = &siu_uart_ports[i];
954 port->ops = &early_uart_ops;
955 }
956
957 register_console(&siu_console);
958
959 return 0;
960}
961
962console_initcall(siu_console_init);
963
964#define SERIAL_VR41XX_CONSOLE &siu_console
965#else
966#define SERIAL_VR41XX_CONSOLE NULL
967#endif
968
969static struct uart_driver siu_uart_driver = {
970 .owner = THIS_MODULE,
971 .driver_name = "SIU",
972 .dev_name = "ttyVR",
973 .devfs_name = "ttvr/",
974 .major = SIU_MAJOR,
975 .minor = SIU_MINOR_BASE,
976 .cons = SERIAL_VR41XX_CONSOLE,
977};
978
979static int siu_probe(struct device *dev)
980{
981 struct uart_port *port;
982 int num, i, retval;
983
984 num = siu_init_ports();
985 if (num <= 0)
986 return -ENODEV;
987
988 siu_uart_driver.nr = num;
989 retval = uart_register_driver(&siu_uart_driver);
990 if (retval)
991 return retval;
992
993 for (i = 0; i < num; i++) {
994 port = &siu_uart_ports[i];
995 port->ops = &siu_uart_ops;
996 port->dev = dev;
997
998 retval = uart_add_one_port(&siu_uart_driver, port);
999 if (retval)
1000 break;
1001 }
1002
1003 if (i == 0 && retval < 0) {
1004 uart_unregister_driver(&siu_uart_driver);
1005 return retval;
1006 }
1007
1008 return 0;
1009}
1010
1011static int siu_remove(struct device *dev)
1012{
1013 struct uart_port *port;
1014 int i;
1015
1016 for (i = 0; i < siu_uart_driver.nr; i++) {
1017 port = &siu_uart_ports[i];
1018 if (port->dev == dev) {
1019 uart_remove_one_port(&siu_uart_driver, port);
1020 port->dev = NULL;
1021 }
1022 }
1023
1024 uart_unregister_driver(&siu_uart_driver);
1025
1026 return 0;
1027}
1028
1029static int siu_suspend(struct device *dev, u32 state, u32 level)
1030{
1031 struct uart_port *port;
1032 int i;
1033
1034 if (level != SUSPEND_DISABLE)
1035 return 0;
1036
1037 for (i = 0; i < siu_uart_driver.nr; i++) {
1038 port = &siu_uart_ports[i];
1039 if ((port->type == PORT_VR41XX_SIU ||
1040 port->type == PORT_VR41XX_DSIU) && port->dev == dev)
1041 uart_suspend_port(&siu_uart_driver, port);
1042
1043 }
1044
1045 return 0;
1046}
1047
1048static int siu_resume(struct device *dev, u32 level)
1049{
1050 struct uart_port *port;
1051 int i;
1052
1053 if (level != RESUME_ENABLE)
1054 return 0;
1055
1056 for (i = 0; i < siu_uart_driver.nr; i++) {
1057 port = &siu_uart_ports[i];
1058 if ((port->type == PORT_VR41XX_SIU ||
1059 port->type == PORT_VR41XX_DSIU) && port->dev == dev)
1060 uart_resume_port(&siu_uart_driver, port);
1061 }
1062
1063 return 0;
1064}
1065
1066static struct platform_device *siu_platform_device;
1067
1068static struct device_driver siu_device_driver = {
1069 .name = "SIU",
1070 .bus = &platform_bus_type,
1071 .probe = siu_probe,
1072 .remove = siu_remove,
1073 .suspend = siu_suspend,
1074 .resume = siu_resume,
1075};
1076
1077static int __devinit vr41xx_siu_init(void)
1078{
1079 int retval;
1080
1081 siu_platform_device = platform_device_register_simple("SIU", -1, NULL, 0);
1082 if (IS_ERR(siu_platform_device))
1083 return PTR_ERR(siu_platform_device);
1084
1085 retval = driver_register(&siu_device_driver);
1086 if (retval < 0)
1087 platform_device_unregister(siu_platform_device);
1088
1089 return retval;
1090}
1091
1092static void __devexit vr41xx_siu_exit(void)
1093{
1094 driver_unregister(&siu_device_driver);
1095
1096 platform_device_unregister(siu_platform_device);
1097}
1098
1099module_init(vr41xx_siu_init);
1100module_exit(vr41xx_siu_exit);
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-24 23:04:40 -0500