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Merge tag 'backlight-next-4.18' of git://git.kernel.org/pub/scm/linux/kernel/git...
[linux-2.6-block.git] / drivers / tty / serial / vr41xx_siu.c
CommitLineData
e3b3d0f5 1// SPDX-License-Identifier: GPL-2.0+
1da177e4
LT		 2/*
3 * Driver for NEC VR4100 series Serial Interface Unit.
4 *
ada8e951 5 * Copyright (C) 2004-2008 Yoichi Yuasa <yuasa@linux-mips.org>
1da177e4
LT		 6 *
7 * Based on drivers/serial/8250.c, by Russell King.
1da177e4 8 */
1da177e4
LT		 9
10#if defined(CONFIG_SERIAL_VR41XX_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
11#define SUPPORT_SYSRQ
12#endif
13
14#include <linux/console.h>
89164940 15#include <linux/errno.h>
1da177e4
LT		 16#include <linux/init.h>
17#include <linux/interrupt.h>
89164940 18#include <linux/ioport.h>
1da177e4 19#include <linux/module.h>
89164940 20#include <linux/platform_device.h>
1da177e4
LT		 21#include <linux/serial.h>
22#include <linux/serial_core.h>
23#include <linux/serial_reg.h>
24#include <linux/tty.h>
25#include <linux/tty_flip.h>
26
27#include <asm/io.h>
28#include <asm/vr41xx/siu.h>
29#include <asm/vr41xx/vr41xx.h>
30
1da177e4
LT		 31#define SIU_BAUD_BASE 1152000
32#define SIU_MAJOR 204
33#define SIU_MINOR_BASE 82
34
35#define RX_MAX_COUNT 256
36#define TX_MAX_COUNT 15
37
38#define SIUIRSEL 0x08
39 #define TMICMODE 0x20
40 #define TMICTX 0x10
41 #define IRMSEL 0x0c
42 #define IRMSEL_HP 0x08
43 #define IRMSEL_TEMIC 0x04
44 #define IRMSEL_SHARP 0x00
45 #define IRUSESEL 0x02
46 #define SIRSEL 0x01
47
89164940
YY		 48static struct uart_port siu_uart_ports[SIU_PORTS_MAX] = {
49 [0 ... SIU_PORTS_MAX-1] = {
50 .lock = __SPIN_LOCK_UNLOCKED(siu_uart_ports->lock),
d4e33fac 51 .irq = 0,
89164940 52 },
1da177e4
LT		 53};
54
2174041d 55#ifdef CONFIG_SERIAL_VR41XX_CONSOLE
1da177e4 56static uint8_t lsr_break_flag[SIU_PORTS_MAX];
2174041d 57#endif
1da177e4
LT		 58
59#define siu_read(port, offset) readb((port)->membase + (offset))
60#define siu_write(port, offset, value) writeb((value), (port)->membase + (offset))
61
62void vr41xx_select_siu_interface(siu_interface_t interface)
63{
64 struct uart_port *port;
65 unsigned long flags;
66 uint8_t irsel;
67
68 port = &siu_uart_ports[0];
69
70 spin_lock_irqsave(&port->lock, flags);
71
72 irsel = siu_read(port, SIUIRSEL);
73 if (interface == SIU_INTERFACE_IRDA)
74 irsel |= SIRSEL;
75 else
76 irsel &= ~SIRSEL;
77 siu_write(port, SIUIRSEL, irsel);
78
79 spin_unlock_irqrestore(&port->lock, flags);
80}
1da177e4
LT		 81EXPORT_SYMBOL_GPL(vr41xx_select_siu_interface);
82
83void vr41xx_use_irda(irda_use_t use)
84{
85 struct uart_port *port;
86 unsigned long flags;
87 uint8_t irsel;
88
89 port = &siu_uart_ports[0];
90
91 spin_lock_irqsave(&port->lock, flags);
92
93 irsel = siu_read(port, SIUIRSEL);
94 if (use == FIR_USE_IRDA)
95 irsel |= IRUSESEL;
96 else
97 irsel &= ~IRUSESEL;
98 siu_write(port, SIUIRSEL, irsel);
99
100 spin_unlock_irqrestore(&port->lock, flags);
101}
1da177e4
LT		 102EXPORT_SYMBOL_GPL(vr41xx_use_irda);
103
104void vr41xx_select_irda_module(irda_module_t module, irda_speed_t speed)
105{
106 struct uart_port *port;
107 unsigned long flags;
108 uint8_t irsel;
109
110 port = &siu_uart_ports[0];
111
112 spin_lock_irqsave(&port->lock, flags);
113
114 irsel = siu_read(port, SIUIRSEL);
115 irsel &= ~(IRMSEL | TMICTX | TMICMODE);
116 switch (module) {
117 case SHARP_IRDA:
118 irsel |= IRMSEL_SHARP;
119 break;
120 case TEMIC_IRDA:
121 irsel |= IRMSEL_TEMIC | TMICMODE;
122 if (speed == IRDA_TX_4MBPS)
123 irsel |= TMICTX;
124 break;
125 case HP_IRDA:
126 irsel |= IRMSEL_HP;
127 break;
128 default:
129 break;
130 }
131 siu_write(port, SIUIRSEL, irsel);
132
133 spin_unlock_irqrestore(&port->lock, flags);
134}
1da177e4
LT		 135EXPORT_SYMBOL_GPL(vr41xx_select_irda_module);
136
137static inline void siu_clear_fifo(struct uart_port *port)
138{
139 siu_write(port, UART_FCR, UART_FCR_ENABLE_FIFO);
140 siu_write(port, UART_FCR, UART_FCR_ENABLE_FIFO | UART_FCR_CLEAR_RCVR |
141 UART_FCR_CLEAR_XMIT);
142 siu_write(port, UART_FCR, 0);
143}
144
1da177e4
LT		 145static inline unsigned long siu_port_size(struct uart_port *port)
146{
147 switch (port->type) {
148 case PORT_VR41XX_SIU:
149 return 11UL;
150 case PORT_VR41XX_DSIU:
151 return 8UL;
152 }
153
154 return 0;
155}
156
157static inline unsigned int siu_check_type(struct uart_port *port)
158{
89164940
YY		 159 if (port->line == 0)
160 return PORT_VR41XX_SIU;
d4e33fac 161 if (port->line == 1 && port->irq)
89164940 162 return PORT_VR41XX_DSIU;
1da177e4
LT		 163
164 return PORT_UNKNOWN;
165}
166
167static inline const char *siu_type_name(struct uart_port *port)
168{
169 switch (port->type) {
170 case PORT_VR41XX_SIU:
171 return "SIU";
172 case PORT_VR41XX_DSIU:
173 return "DSIU";
174 }
175
eae936e2 176 return NULL;
1da177e4
LT		 177}
178
179static unsigned int siu_tx_empty(struct uart_port *port)
180{
181 uint8_t lsr;
182
183 lsr = siu_read(port, UART_LSR);
184 if (lsr & UART_LSR_TEMT)
185 return TIOCSER_TEMT;
186
187 return 0;
188}
189
190static void siu_set_mctrl(struct uart_port *port, unsigned int mctrl)
191{
192 uint8_t mcr = 0;
193
194 if (mctrl & TIOCM_DTR)
195 mcr |= UART_MCR_DTR;
196 if (mctrl & TIOCM_RTS)
197 mcr |= UART_MCR_RTS;
198 if (mctrl & TIOCM_OUT1)
199 mcr |= UART_MCR_OUT1;
200 if (mctrl & TIOCM_OUT2)
201 mcr |= UART_MCR_OUT2;
202 if (mctrl & TIOCM_LOOP)
203 mcr |= UART_MCR_LOOP;
204
205 siu_write(port, UART_MCR, mcr);
206}
207
208static unsigned int siu_get_mctrl(struct uart_port *port)
209{
210 uint8_t msr;
211 unsigned int mctrl = 0;
212
213 msr = siu_read(port, UART_MSR);
214 if (msr & UART_MSR_DCD)
215 mctrl |= TIOCM_CAR;
216 if (msr & UART_MSR_RI)
217 mctrl |= TIOCM_RNG;
218 if (msr & UART_MSR_DSR)
219 mctrl |= TIOCM_DSR;
220 if (msr & UART_MSR_CTS)
221 mctrl |= TIOCM_CTS;
222
223 return mctrl;
224}
225
b129a8cc 226static void siu_stop_tx(struct uart_port *port)
1da177e4
LT		 227{
228 unsigned long flags;
229 uint8_t ier;
230
231 spin_lock_irqsave(&port->lock, flags);
232
233 ier = siu_read(port, UART_IER);
234 ier &= ~UART_IER_THRI;
235 siu_write(port, UART_IER, ier);
236
237 spin_unlock_irqrestore(&port->lock, flags);
238}
239
b129a8cc 240static void siu_start_tx(struct uart_port *port)
1da177e4
LT		 241{
242 unsigned long flags;
243 uint8_t ier;
244
245 spin_lock_irqsave(&port->lock, flags);
246
247 ier = siu_read(port, UART_IER);
248 ier |= UART_IER_THRI;
249 siu_write(port, UART_IER, ier);
250
251 spin_unlock_irqrestore(&port->lock, flags);
252}
253
254static void siu_stop_rx(struct uart_port *port)
255{
256 unsigned long flags;
257 uint8_t ier;
258
259 spin_lock_irqsave(&port->lock, flags);
260
261 ier = siu_read(port, UART_IER);
262 ier &= ~UART_IER_RLSI;
263 siu_write(port, UART_IER, ier);
264
265 port->read_status_mask &= ~UART_LSR_DR;
266
267 spin_unlock_irqrestore(&port->lock, flags);
268}
269
270static void siu_enable_ms(struct uart_port *port)
271{
272 unsigned long flags;
273 uint8_t ier;
274
275 spin_lock_irqsave(&port->lock, flags);
276
277 ier = siu_read(port, UART_IER);
278 ier |= UART_IER_MSI;
279 siu_write(port, UART_IER, ier);
280
281 spin_unlock_irqrestore(&port->lock, flags);
282}
283
284static void siu_break_ctl(struct uart_port *port, int ctl)
285{
286 unsigned long flags;
287 uint8_t lcr;
288
289 spin_lock_irqsave(&port->lock, flags);
290
291 lcr = siu_read(port, UART_LCR);
292 if (ctl == -1)
293 lcr |= UART_LCR_SBC;
294 else
295 lcr &= ~UART_LCR_SBC;
296 siu_write(port, UART_LCR, lcr);
297
298 spin_unlock_irqrestore(&port->lock, flags);
299}
300
7d12e780 301static inline void receive_chars(struct uart_port *port, uint8_t *status)
1da177e4 302{
1da177e4
LT		 303 uint8_t lsr, ch;
304 char flag;
305 int max_count = RX_MAX_COUNT;
306
1da177e4
LT		 307 lsr = *status;
308
309 do {
1da177e4
LT		 310 ch = siu_read(port, UART_RX);
311 port->icount.rx++;
312 flag = TTY_NORMAL;
313
314#ifdef CONFIG_SERIAL_VR41XX_CONSOLE
315 lsr |= lsr_break_flag[port->line];
316 lsr_break_flag[port->line] = 0;
317#endif
318 if (unlikely(lsr & (UART_LSR_BI | UART_LSR_FE |
319 UART_LSR_PE | UART_LSR_OE))) {
320 if (lsr & UART_LSR_BI) {
321 lsr &= ~(UART_LSR_FE | UART_LSR_PE);
322 port->icount.brk++;
323
324 if (uart_handle_break(port))
325 goto ignore_char;
326 }
327
328 if (lsr & UART_LSR_FE)
329 port->icount.frame++;
330 if (lsr & UART_LSR_PE)
331 port->icount.parity++;
332 if (lsr & UART_LSR_OE)
333 port->icount.overrun++;
334
335 lsr &= port->read_status_mask;
336 if (lsr & UART_LSR_BI)
337 flag = TTY_BREAK;
338 if (lsr & UART_LSR_FE)
339 flag = TTY_FRAME;
340 if (lsr & UART_LSR_PE)
341 flag = TTY_PARITY;
342 }
343
7d12e780 344 if (uart_handle_sysrq_char(port, ch))
1da177e4 345 goto ignore_char;
05ab3014
RK		 346
347 uart_insert_char(port, lsr, UART_LSR_OE, ch, flag);
1da177e4
LT		 348
349 ignore_char:
350 lsr = siu_read(port, UART_LSR);
351 } while ((lsr & UART_LSR_DR) && (max_count-- > 0));
352
2e124b4a 353 tty_flip_buffer_push(&port->state->port);
1da177e4
LT		 354
355 *status = lsr;
356}
357
358static inline void check_modem_status(struct uart_port *port)
359{
360 uint8_t msr;
361
362 msr = siu_read(port, UART_MSR);
363 if ((msr & UART_MSR_ANY_DELTA) == 0)
364 return;
365 if (msr & UART_MSR_DDCD)
366 uart_handle_dcd_change(port, msr & UART_MSR_DCD);
367 if (msr & UART_MSR_TERI)
368 port->icount.rng++;
369 if (msr & UART_MSR_DDSR)
370 port->icount.dsr++;
371 if (msr & UART_MSR_DCTS)
372 uart_handle_cts_change(port, msr & UART_MSR_CTS);
373
bdc04e31 374 wake_up_interruptible(&port->state->port.delta_msr_wait);
1da177e4
LT		 375}
376
377static inline void transmit_chars(struct uart_port *port)
378{
379 struct circ_buf *xmit;
380 int max_count = TX_MAX_COUNT;
381
ebd2c8f6 382 xmit = &port->state->xmit;
1da177e4
LT		 383
384 if (port->x_char) {
385 siu_write(port, UART_TX, port->x_char);
386 port->icount.tx++;
387 port->x_char = 0;
388 return;
389 }
390
391 if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
b129a8cc 392 siu_stop_tx(port);
1da177e4
LT		 393 return;
394 }
395
396 do {
397 siu_write(port, UART_TX, xmit->buf[xmit->tail]);
398 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
399 port->icount.tx++;
400 if (uart_circ_empty(xmit))
401 break;
402 } while (max_count-- > 0);
403
404 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
405 uart_write_wakeup(port);
406
407 if (uart_circ_empty(xmit))
b129a8cc 408 siu_stop_tx(port);
1da177e4
LT		 409}
410
7d12e780 411static irqreturn_t siu_interrupt(int irq, void *dev_id)
1da177e4
LT		 412{
413 struct uart_port *port;
414 uint8_t iir, lsr;
415
1da177e4
LT		 416 port = (struct uart_port *)dev_id;
417
418 iir = siu_read(port, UART_IIR);
419 if (iir & UART_IIR_NO_INT)
420 return IRQ_NONE;
421
422 lsr = siu_read(port, UART_LSR);
423 if (lsr & UART_LSR_DR)
7d12e780 424 receive_chars(port, &lsr);
1da177e4
LT		 425
426 check_modem_status(port);
427
428 if (lsr & UART_LSR_THRE)
429 transmit_chars(port);
430
431 return IRQ_HANDLED;
432}
433
434static int siu_startup(struct uart_port *port)
435{
436 int retval;
437
eae936e2
YY		 438 if (port->membase == NULL)
439 return -ENODEV;
440
1da177e4
LT		 441 siu_clear_fifo(port);
442
443 (void)siu_read(port, UART_LSR);
444 (void)siu_read(port, UART_RX);
445 (void)siu_read(port, UART_IIR);
446 (void)siu_read(port, UART_MSR);
447
448 if (siu_read(port, UART_LSR) == 0xff)
449 return -ENODEV;
450
451 retval = request_irq(port->irq, siu_interrupt, 0, siu_type_name(port), port);
452 if (retval)
453 return retval;
454
455 if (port->type == PORT_VR41XX_DSIU)
456 vr41xx_enable_dsiuint(DSIUINT_ALL);
457
458 siu_write(port, UART_LCR, UART_LCR_WLEN8);
459
460 spin_lock_irq(&port->lock);
461 siu_set_mctrl(port, port->mctrl);
462 spin_unlock_irq(&port->lock);
463
464 siu_write(port, UART_IER, UART_IER_RLSI | UART_IER_RDI);
465
466 (void)siu_read(port, UART_LSR);
467 (void)siu_read(port, UART_RX);
468 (void)siu_read(port, UART_IIR);
469 (void)siu_read(port, UART_MSR);
470
471 return 0;
472}
473
474static void siu_shutdown(struct uart_port *port)
475{
476 unsigned long flags;
477 uint8_t lcr;
478
1da177e4
LT		 479 siu_write(port, UART_IER, 0);
480
481 spin_lock_irqsave(&port->lock, flags);
482
483 port->mctrl &= ~TIOCM_OUT2;
484 siu_set_mctrl(port, port->mctrl);
485
486 spin_unlock_irqrestore(&port->lock, flags);
487
488 lcr = siu_read(port, UART_LCR);
489 lcr &= ~UART_LCR_SBC;
490 siu_write(port, UART_LCR, lcr);
491
492 siu_clear_fifo(port);
493
494 (void)siu_read(port, UART_RX);
495
496 if (port->type == PORT_VR41XX_DSIU)
497 vr41xx_disable_dsiuint(DSIUINT_ALL);
498
499 free_irq(port->irq, port);
500}
501
606d099c
AC		 502static void siu_set_termios(struct uart_port *port, struct ktermios *new,
503 struct ktermios *old)
1da177e4
LT		 504{
505 tcflag_t c_cflag, c_iflag;
506 uint8_t lcr, fcr, ier;
507 unsigned int baud, quot;
508 unsigned long flags;
509
510 c_cflag = new->c_cflag;
511 switch (c_cflag & CSIZE) {
512 case CS5:
513 lcr = UART_LCR_WLEN5;
514 break;
515 case CS6:
516 lcr = UART_LCR_WLEN6;
517 break;
518 case CS7:
519 lcr = UART_LCR_WLEN7;
520 break;
521 default:
522 lcr = UART_LCR_WLEN8;
523 break;
524 }
525
526 if (c_cflag & CSTOPB)
527 lcr |= UART_LCR_STOP;
528 if (c_cflag & PARENB)
529 lcr |= UART_LCR_PARITY;
530 if ((c_cflag & PARODD) != PARODD)
531 lcr |= UART_LCR_EPAR;
532 if (c_cflag & CMSPAR)
533 lcr |= UART_LCR_SPAR;
534
535 baud = uart_get_baud_rate(port, new, old, 0, port->uartclk/16);
536 quot = uart_get_divisor(port, baud);
537
538 fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10;
539
540 spin_lock_irqsave(&port->lock, flags);
541
542 uart_update_timeout(port, c_cflag, baud);
543
544 c_iflag = new->c_iflag;
545
546 port->read_status_mask = UART_LSR_THRE | UART_LSR_OE | UART_LSR_DR;
547 if (c_iflag & INPCK)
548 port->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
ef8b9ddc 549 if (c_iflag & (IGNBRK | BRKINT | PARMRK))
1da177e4
LT		 550 port->read_status_mask |= UART_LSR_BI;
551
552 port->ignore_status_mask = 0;
553 if (c_iflag & IGNPAR)
554 port->ignore_status_mask |= UART_LSR_FE | UART_LSR_PE;
555 if (c_iflag & IGNBRK) {
556 port->ignore_status_mask |= UART_LSR_BI;
557 if (c_iflag & IGNPAR)
558 port->ignore_status_mask |= UART_LSR_OE;
559 }
560
561 if ((c_cflag & CREAD) == 0)
562 port->ignore_status_mask |= UART_LSR_DR;
563
564 ier = siu_read(port, UART_IER);
565 ier &= ~UART_IER_MSI;
566 if (UART_ENABLE_MS(port, c_cflag))
567 ier |= UART_IER_MSI;
568 siu_write(port, UART_IER, ier);
569
570 siu_write(port, UART_LCR, lcr | UART_LCR_DLAB);
571
572 siu_write(port, UART_DLL, (uint8_t)quot);
573 siu_write(port, UART_DLM, (uint8_t)(quot >> 8));
574
575 siu_write(port, UART_LCR, lcr);
576
577 siu_write(port, UART_FCR, fcr);
578
579 siu_set_mctrl(port, port->mctrl);
580
581 spin_unlock_irqrestore(&port->lock, flags);
582}
583
584static void siu_pm(struct uart_port *port, unsigned int state, unsigned int oldstate)
585{
586 switch (state) {
587 case 0:
588 switch (port->type) {
589 case PORT_VR41XX_SIU:
590 vr41xx_supply_clock(SIU_CLOCK);
591 break;
592 case PORT_VR41XX_DSIU:
593 vr41xx_supply_clock(DSIU_CLOCK);
594 break;
595 }
596 break;
597 case 3:
598 switch (port->type) {
599 case PORT_VR41XX_SIU:
600 vr41xx_mask_clock(SIU_CLOCK);
601 break;
602 case PORT_VR41XX_DSIU:
603 vr41xx_mask_clock(DSIU_CLOCK);
604 break;
605 }
606 break;
607 }
608}
609
610static const char *siu_type(struct uart_port *port)
611{
612 return siu_type_name(port);
613}
614
615static void siu_release_port(struct uart_port *port)
616{
617 unsigned long size;
618
619 if (port->flags & UPF_IOREMAP) {
620 iounmap(port->membase);
621 port->membase = NULL;
622 }
623
624 size = siu_port_size(port);
625 release_mem_region(port->mapbase, size);
626}
627
628static int siu_request_port(struct uart_port *port)
629{
630 unsigned long size;
631 struct resource *res;
632
633 size = siu_port_size(port);
634 res = request_mem_region(port->mapbase, size, siu_type_name(port));
635 if (res == NULL)
636 return -EBUSY;
637
638 if (port->flags & UPF_IOREMAP) {
639 port->membase = ioremap(port->mapbase, size);
640 if (port->membase == NULL) {
641 release_resource(res);
642 return -ENOMEM;
643 }
644 }
645
646 return 0;
647}
648
649static void siu_config_port(struct uart_port *port, int flags)
650{
651 if (flags & UART_CONFIG_TYPE) {
652 port->type = siu_check_type(port);
653 (void)siu_request_port(port);
654 }
655}
656
657static int siu_verify_port(struct uart_port *port, struct serial_struct *serial)
658{
659 if (port->type != PORT_VR41XX_SIU && port->type != PORT_VR41XX_DSIU)
660 return -EINVAL;
661 if (port->irq != serial->irq)
662 return -EINVAL;
663 if (port->iotype != serial->io_type)
664 return -EINVAL;
665 if (port->mapbase != (unsigned long)serial->iomem_base)
666 return -EINVAL;
667
668 return 0;
669}
670
2331e068 671static const struct uart_ops siu_uart_ops = {
1da177e4
LT		 672 .tx_empty = siu_tx_empty,
673 .set_mctrl = siu_set_mctrl,
674 .get_mctrl = siu_get_mctrl,
675 .stop_tx = siu_stop_tx,
676 .start_tx = siu_start_tx,
677 .stop_rx = siu_stop_rx,
678 .enable_ms = siu_enable_ms,
679 .break_ctl = siu_break_ctl,
680 .startup = siu_startup,
681 .shutdown = siu_shutdown,
682 .set_termios = siu_set_termios,
683 .pm = siu_pm,
684 .type = siu_type,
685 .release_port = siu_release_port,
686 .request_port = siu_request_port,
687 .config_port = siu_config_port,
688 .verify_port = siu_verify_port,
689};
690
89164940 691static int siu_init_ports(struct platform_device *pdev)
1da177e4 692{
1da177e4 693 struct uart_port *port;
89164940 694 struct resource *res;
574de559 695 int *type = dev_get_platdata(&pdev->dev);
89164940 696 int i;
1da177e4 697
89164940 698 if (!type)
1da177e4 699 return 0;
1da177e4
LT		 700
701 port = siu_uart_ports;
89164940
YY		 702 for (i = 0; i < SIU_PORTS_MAX; i++) {
703 port->type = type[i];
704 if (port->type == PORT_UNKNOWN)
705 continue;
706 port->irq = platform_get_irq(pdev, i);
1da177e4
LT		 707 port->uartclk = SIU_BAUD_BASE * 16;
708 port->fifosize = 16;
709 port->regshift = 0;
710 port->iotype = UPIO_MEM;
711 port->flags = UPF_IOREMAP | UPF_BOOT_AUTOCONF;
1da177e4 712 port->line = i;
89164940
YY		 713 res = platform_get_resource(pdev, IORESOURCE_MEM, i);
714 port->mapbase = res->start;
1da177e4
LT		 715 port++;
716 }
717
89164940 718 return i;
1da177e4
LT		 719}
720
721#ifdef CONFIG_SERIAL_VR41XX_CONSOLE
722
1da177e4
LT		 723#define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE)
724
725static void wait_for_xmitr(struct uart_port *port)
726{
727 int timeout = 10000;
728 uint8_t lsr, msr;
729
730 do {
731 lsr = siu_read(port, UART_LSR);
732 if (lsr & UART_LSR_BI)
733 lsr_break_flag[port->line] = UART_LSR_BI;
734
735 if ((lsr & BOTH_EMPTY) == BOTH_EMPTY)
736 break;
737 } while (timeout-- > 0);
738
739 if (port->flags & UPF_CONS_FLOW) {
740 timeout = 1000000;
741
742 do {
743 msr = siu_read(port, UART_MSR);
744 if ((msr & UART_MSR_CTS) != 0)
745 break;
746 } while (timeout-- > 0);
747 }
748}
749
d358788f
RK		 750static void siu_console_putchar(struct uart_port *port, int ch)
751{
752 wait_for_xmitr(port);
753 siu_write(port, UART_TX, ch);
754}
755
1da177e4
LT		 756static void siu_console_write(struct console *con, const char *s, unsigned count)
757{
758 struct uart_port *port;
759 uint8_t ier;
1da177e4
LT		 760
761 port = &siu_uart_ports[con->index];
762
763 ier = siu_read(port, UART_IER);
764 siu_write(port, UART_IER, 0);
765
d358788f 766 uart_console_write(port, s, count, siu_console_putchar);
1da177e4
LT		 767
768 wait_for_xmitr(port);
769 siu_write(port, UART_IER, ier);
770}
771
a24ac9fb 772static int __init siu_console_setup(struct console *con, char *options)
1da177e4
LT		 773{
774 struct uart_port *port;
775 int baud = 9600;
776 int parity = 'n';
777 int bits = 8;
778 int flow = 'n';
779
780 if (con->index >= SIU_PORTS_MAX)
781 con->index = 0;
782
783 port = &siu_uart_ports[con->index];
784 if (port->membase == NULL) {
785 if (port->mapbase == 0)
786 return -ENODEV;
eae936e2 787 port->membase = ioremap(port->mapbase, siu_port_size(port));
1da177e4
LT		 788 }
789
a95d3209
YY		 790 if (port->type == PORT_VR41XX_SIU)
791 vr41xx_select_siu_interface(SIU_INTERFACE_RS232C);
1da177e4
LT		 792
793 if (options != NULL)
794 uart_parse_options(options, &baud, &parity, &bits, &flow);
795
796 return uart_set_options(port, con, baud, parity, bits, flow);
797}
798
799static struct uart_driver siu_uart_driver;
800
801static struct console siu_console = {
802 .name = "ttyVR",
803 .write = siu_console_write,
804 .device = uart_console_device,
805 .setup = siu_console_setup,
806 .flags = CON_PRINTBUFFER,
807 .index = -1,
808 .data = &siu_uart_driver,
809};
810
9671f099 811static int siu_console_init(void)
1da177e4
LT		 812{
813 struct uart_port *port;
89164940 814 int i;
1da177e4 815
89164940 816 for (i = 0; i < SIU_PORTS_MAX; i++) {
1da177e4 817 port = &siu_uart_ports[i];
eae936e2 818 port->ops = &siu_uart_ops;
1da177e4
LT		 819 }
820
821 register_console(&siu_console);
822
823 return 0;
824}
825
826console_initcall(siu_console_init);
827
baac5895
YY		 828void __init vr41xx_siu_early_setup(struct uart_port *port)
829{
830 if (port->type == PORT_UNKNOWN)
831 return;
832
833 siu_uart_ports[port->line].line = port->line;
834 siu_uart_ports[port->line].type = port->type;
835 siu_uart_ports[port->line].uartclk = SIU_BAUD_BASE * 16;
836 siu_uart_ports[port->line].mapbase = port->mapbase;
baac5895
YY		 837 siu_uart_ports[port->line].ops = &siu_uart_ops;
838}
839
1da177e4
LT		 840#define SERIAL_VR41XX_CONSOLE &siu_console
841#else
842#define SERIAL_VR41XX_CONSOLE NULL
843#endif
844
845static struct uart_driver siu_uart_driver = {
846 .owner = THIS_MODULE,
847 .driver_name = "SIU",
848 .dev_name = "ttyVR",
1da177e4
LT		 849 .major = SIU_MAJOR,
850 .minor = SIU_MINOR_BASE,
851 .cons = SERIAL_VR41XX_CONSOLE,
852};
853
9671f099 854static int siu_probe(struct platform_device *dev)
1da177e4
LT		 855{
856 struct uart_port *port;
857 int num, i, retval;
858
89164940 859 num = siu_init_ports(dev);
1da177e4
LT		 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;
3ae5eaec 871 port->dev = &dev->dev;
1da177e4
LT		 872
873 retval = uart_add_one_port(&siu_uart_driver, port);
eae936e2
YY		 874 if (retval < 0) {
875 port->dev = NULL;
1da177e4 876 break;
eae936e2 877 }
1da177e4
LT		 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
ae8d8a14 888static int siu_remove(struct platform_device *dev)
1da177e4
LT		 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];
3ae5eaec 895 if (port->dev == &dev->dev) {
1da177e4
LT		 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
3ae5eaec 906static int siu_suspend(struct platform_device *dev, pm_message_t state)
1da177e4
LT		 907{
908 struct uart_port *port;
909 int i;
910
1da177e4
LT		 911 for (i = 0; i < siu_uart_driver.nr; i++) {
912 port = &siu_uart_ports[i];
913 if ((port->type == PORT_VR41XX_SIU ||
3ae5eaec 914 port->type == PORT_VR41XX_DSIU) && port->dev == &dev->dev)
1da177e4
LT		 915 uart_suspend_port(&siu_uart_driver, port);
916
917 }
918
919 return 0;
920}
921
3ae5eaec 922static int siu_resume(struct platform_device *dev)
1da177e4
LT		 923{
924 struct uart_port *port;
925 int i;
926
1da177e4
LT		 927 for (i = 0; i < siu_uart_driver.nr; i++) {
928 port = &siu_uart_ports[i];
929 if ((port->type == PORT_VR41XX_SIU ||
3ae5eaec 930 port->type == PORT_VR41XX_DSIU) && port->dev == &dev->dev)
1da177e4
LT		 931 uart_resume_port(&siu_uart_driver, port);
932 }
933
934 return 0;
935}
936
3ae5eaec 937static struct platform_driver siu_device_driver = {
1da177e4 938 .probe = siu_probe,
2d47b716 939 .remove = siu_remove,
1da177e4
LT		 940 .suspend = siu_suspend,
941 .resume = siu_resume,
3ae5eaec
RK		 942 .driver = {
943 .name = "SIU",
944 },
1da177e4
LT		 945};
946
c8381c15 947module_platform_driver(siu_device_driver);
e169c139
KS		 948
949MODULE_LICENSE("GPL");
950MODULE_ALIAS("platform:SIU");
Linux 6.x block layer and io_uring tree(s)