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16#include <linux/kernel.h>
17#include <linux/init.h>
18#include <linux/interrupt.h>
19#include <linux/module.h>
20#include <linux/console.h>
21#include <linux/tty.h>
22#include <linux/tty_flip.h>
23#include <linux/serial.h>
24#include <linux/serial_core.h>
25#include <linux/io.h>
26#include <linux/uaccess.h>
27#include <asm/coldfire.h>
28#include <asm/mcfsim.h>
29#include <asm/mcfuart.h>
30#include <asm/nettel.h>
31
32
33
34
35
36
37
38
39
40#if !defined(mcf_getppdcd)
41#define mcf_getppdcd(p) (1)
42#endif
43#if !defined(mcf_getppdtr)
44#define mcf_getppdtr(p) (1)
45#endif
46#if !defined(mcf_setppdtr)
47#define mcf_setppdtr(p, v) do { } while (0)
48#endif
49
50
51
52
53
54
55struct mcf_uart {
56 struct uart_port port;
57 unsigned int sigs;
58 unsigned char imr;
59 struct serial_rs485 rs485;
60};
61
62
63
64static unsigned int mcf_tx_empty(struct uart_port *port)
65{
66 return (readb(port->membase + MCFUART_USR) & MCFUART_USR_TXEMPTY) ?
67 TIOCSER_TEMT : 0;
68}
69
70
71
72static unsigned int mcf_get_mctrl(struct uart_port *port)
73{
74 struct mcf_uart *pp = container_of(port, struct mcf_uart, port);
75 unsigned int sigs;
76
77 sigs = (readb(port->membase + MCFUART_UIPR) & MCFUART_UIPR_CTS) ?
78 0 : TIOCM_CTS;
79 sigs |= (pp->sigs & TIOCM_RTS);
80 sigs |= (mcf_getppdcd(port->line) ? TIOCM_CD : 0);
81 sigs |= (mcf_getppdtr(port->line) ? TIOCM_DTR : 0);
82
83 return sigs;
84}
85
86
87
88static void mcf_set_mctrl(struct uart_port *port, unsigned int sigs)
89{
90 struct mcf_uart *pp = container_of(port, struct mcf_uart, port);
91
92 pp->sigs = sigs;
93 mcf_setppdtr(port->line, (sigs & TIOCM_DTR));
94 if (sigs & TIOCM_RTS)
95 writeb(MCFUART_UOP_RTS, port->membase + MCFUART_UOP1);
96 else
97 writeb(MCFUART_UOP_RTS, port->membase + MCFUART_UOP0);
98}
99
100
101
102static void mcf_start_tx(struct uart_port *port)
103{
104 struct mcf_uart *pp = container_of(port, struct mcf_uart, port);
105
106 if (pp->rs485.flags & SER_RS485_ENABLED) {
107
108 writeb(MCFUART_UCR_TXENABLE, port->membase + MCFUART_UCR);
109
110 writeb(MCFUART_UOP_RTS, port->membase + MCFUART_UOP1);
111 }
112 pp->imr |= MCFUART_UIR_TXREADY;
113 writeb(pp->imr, port->membase + MCFUART_UIMR);
114}
115
116
117
118static void mcf_stop_tx(struct uart_port *port)
119{
120 struct mcf_uart *pp = container_of(port, struct mcf_uart, port);
121
122 pp->imr &= ~MCFUART_UIR_TXREADY;
123 writeb(pp->imr, port->membase + MCFUART_UIMR);
124}
125
126
127
128static void mcf_stop_rx(struct uart_port *port)
129{
130 struct mcf_uart *pp = container_of(port, struct mcf_uart, port);
131
132 pp->imr &= ~MCFUART_UIR_RXREADY;
133 writeb(pp->imr, port->membase + MCFUART_UIMR);
134}
135
136
137
138static void mcf_break_ctl(struct uart_port *port, int break_state)
139{
140 unsigned long flags;
141
142 spin_lock_irqsave(&port->lock, flags);
143 if (break_state == -1)
144 writeb(MCFUART_UCR_CMDBREAKSTART, port->membase + MCFUART_UCR);
145 else
146 writeb(MCFUART_UCR_CMDBREAKSTOP, port->membase + MCFUART_UCR);
147 spin_unlock_irqrestore(&port->lock, flags);
148}
149
150
151
152static void mcf_enable_ms(struct uart_port *port)
153{
154}
155
156
157
158static int mcf_startup(struct uart_port *port)
159{
160 struct mcf_uart *pp = container_of(port, struct mcf_uart, port);
161 unsigned long flags;
162
163 spin_lock_irqsave(&port->lock, flags);
164
165
166 writeb(MCFUART_UCR_CMDRESETRX, port->membase + MCFUART_UCR);
167 writeb(MCFUART_UCR_CMDRESETTX, port->membase + MCFUART_UCR);
168
169
170 writeb(MCFUART_UCR_RXENABLE | MCFUART_UCR_TXENABLE,
171 port->membase + MCFUART_UCR);
172
173
174 pp->imr = MCFUART_UIR_RXREADY;
175 writeb(pp->imr, port->membase + MCFUART_UIMR);
176
177 spin_unlock_irqrestore(&port->lock, flags);
178
179 return 0;
180}
181
182
183
184static void mcf_shutdown(struct uart_port *port)
185{
186 struct mcf_uart *pp = container_of(port, struct mcf_uart, port);
187 unsigned long flags;
188
189 spin_lock_irqsave(&port->lock, flags);
190
191
192 pp->imr = 0;
193 writeb(pp->imr, port->membase + MCFUART_UIMR);
194
195
196 writeb(MCFUART_UCR_CMDRESETRX, port->membase + MCFUART_UCR);
197 writeb(MCFUART_UCR_CMDRESETTX, port->membase + MCFUART_UCR);
198
199 spin_unlock_irqrestore(&port->lock, flags);
200}
201
202
203
204static void mcf_set_termios(struct uart_port *port, struct ktermios *termios,
205 struct ktermios *old)
206{
207 struct mcf_uart *pp = container_of(port, struct mcf_uart, port);
208 unsigned long flags;
209 unsigned int baud, baudclk;
210#if defined(CONFIG_M5272)
211 unsigned int baudfr;
212#endif
213 unsigned char mr1, mr2;
214
215 baud = uart_get_baud_rate(port, termios, old, 0, 230400);
216#if defined(CONFIG_M5272)
217 baudclk = (MCF_BUSCLK / baud) / 32;
218 baudfr = (((MCF_BUSCLK / baud) + 1) / 2) % 16;
219#else
220 baudclk = ((MCF_BUSCLK / baud) + 16) / 32;
221#endif
222
223 mr1 = MCFUART_MR1_RXIRQRDY | MCFUART_MR1_RXERRCHAR;
224 mr2 = 0;
225
226 switch (termios->c_cflag & CSIZE) {
227 case CS5: mr1 |= MCFUART_MR1_CS5; break;
228 case CS6: mr1 |= MCFUART_MR1_CS6; break;
229 case CS7: mr1 |= MCFUART_MR1_CS7; break;
230 case CS8:
231 default: mr1 |= MCFUART_MR1_CS8; break;
232 }
233
234 if (termios->c_cflag & PARENB) {
235 if (termios->c_cflag & CMSPAR) {
236 if (termios->c_cflag & PARODD)
237 mr1 |= MCFUART_MR1_PARITYMARK;
238 else
239 mr1 |= MCFUART_MR1_PARITYSPACE;
240 } else {
241 if (termios->c_cflag & PARODD)
242 mr1 |= MCFUART_MR1_PARITYODD;
243 else
244 mr1 |= MCFUART_MR1_PARITYEVEN;
245 }
246 } else {
247 mr1 |= MCFUART_MR1_PARITYNONE;
248 }
249
250 if (termios->c_cflag & CSTOPB)
251 mr2 |= MCFUART_MR2_STOP2;
252 else
253 mr2 |= MCFUART_MR2_STOP1;
254
255 if (termios->c_cflag & CRTSCTS) {
256 mr1 |= MCFUART_MR1_RXRTS;
257 mr2 |= MCFUART_MR2_TXCTS;
258 }
259
260 if (pp->rs485.flags & SER_RS485_ENABLED) {
261 dev_dbg(port->dev, "Setting UART to RS485\n");
262 mr2 |= MCFUART_MR2_TXRTS;
263 }
264
265 spin_lock_irqsave(&port->lock, flags);
266 uart_update_timeout(port, termios->c_cflag, baud);
267 writeb(MCFUART_UCR_CMDRESETRX, port->membase + MCFUART_UCR);
268 writeb(MCFUART_UCR_CMDRESETTX, port->membase + MCFUART_UCR);
269 writeb(MCFUART_UCR_CMDRESETMRPTR, port->membase + MCFUART_UCR);
270 writeb(mr1, port->membase + MCFUART_UMR);
271 writeb(mr2, port->membase + MCFUART_UMR);
272 writeb((baudclk & 0xff00) >> 8, port->membase + MCFUART_UBG1);
273 writeb((baudclk & 0xff), port->membase + MCFUART_UBG2);
274#if defined(CONFIG_M5272)
275 writeb((baudfr & 0x0f), port->membase + MCFUART_UFPD);
276#endif
277 writeb(MCFUART_UCSR_RXCLKTIMER | MCFUART_UCSR_TXCLKTIMER,
278 port->membase + MCFUART_UCSR);
279 writeb(MCFUART_UCR_RXENABLE | MCFUART_UCR_TXENABLE,
280 port->membase + MCFUART_UCR);
281 spin_unlock_irqrestore(&port->lock, flags);
282}
283
284
285
286static void mcf_rx_chars(struct mcf_uart *pp)
287{
288 struct uart_port *port = &pp->port;
289 unsigned char status, ch, flag;
290
291 while ((status = readb(port->membase + MCFUART_USR)) & MCFUART_USR_RXREADY) {
292 ch = readb(port->membase + MCFUART_URB);
293 flag = TTY_NORMAL;
294 port->icount.rx++;
295
296 if (status & MCFUART_USR_RXERR) {
297 writeb(MCFUART_UCR_CMDRESETERR,
298 port->membase + MCFUART_UCR);
299
300 if (status & MCFUART_USR_RXBREAK) {
301 port->icount.brk++;
302 if (uart_handle_break(port))
303 continue;
304 } else if (status & MCFUART_USR_RXPARITY) {
305 port->icount.parity++;
306 } else if (status & MCFUART_USR_RXOVERRUN) {
307 port->icount.overrun++;
308 } else if (status & MCFUART_USR_RXFRAMING) {
309 port->icount.frame++;
310 }
311
312 status &= port->read_status_mask;
313
314 if (status & MCFUART_USR_RXBREAK)
315 flag = TTY_BREAK;
316 else if (status & MCFUART_USR_RXPARITY)
317 flag = TTY_PARITY;
318 else if (status & MCFUART_USR_RXFRAMING)
319 flag = TTY_FRAME;
320 }
321
322 if (uart_handle_sysrq_char(port, ch))
323 continue;
324 uart_insert_char(port, status, MCFUART_USR_RXOVERRUN, ch, flag);
325 }
326
327 tty_flip_buffer_push(&port->state->port);
328}
329
330
331
332static void mcf_tx_chars(struct mcf_uart *pp)
333{
334 struct uart_port *port = &pp->port;
335 struct circ_buf *xmit = &port->state->xmit;
336
337 if (port->x_char) {
338
339 writeb(port->x_char, port->membase + MCFUART_UTB);
340 port->x_char = 0;
341 port->icount.tx++;
342 return;
343 }
344
345 while (readb(port->membase + MCFUART_USR) & MCFUART_USR_TXREADY) {
346 if (xmit->head == xmit->tail)
347 break;
348 writeb(xmit->buf[xmit->tail], port->membase + MCFUART_UTB);
349 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE -1);
350 port->icount.tx++;
351 }
352
353 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
354 uart_write_wakeup(port);
355
356 if (xmit->head == xmit->tail) {
357 pp->imr &= ~MCFUART_UIR_TXREADY;
358 writeb(pp->imr, port->membase + MCFUART_UIMR);
359
360 if (pp->rs485.flags & SER_RS485_ENABLED)
361 writeb(MCFUART_UCR_TXDISABLE,
362 port->membase + MCFUART_UCR);
363 }
364}
365
366
367
368static irqreturn_t mcf_interrupt(int irq, void *data)
369{
370 struct uart_port *port = data;
371 struct mcf_uart *pp = container_of(port, struct mcf_uart, port);
372 unsigned int isr;
373 irqreturn_t ret = IRQ_NONE;
374
375 isr = readb(port->membase + MCFUART_UISR) & pp->imr;
376
377 spin_lock(&port->lock);
378 if (isr & MCFUART_UIR_RXREADY) {
379 mcf_rx_chars(pp);
380 ret = IRQ_HANDLED;
381 }
382 if (isr & MCFUART_UIR_TXREADY) {
383 mcf_tx_chars(pp);
384 ret = IRQ_HANDLED;
385 }
386 spin_unlock(&port->lock);
387
388 return ret;
389}
390
391
392
393static void mcf_config_port(struct uart_port *port, int flags)
394{
395 port->type = PORT_MCF;
396 port->fifosize = MCFUART_TXFIFOSIZE;
397
398
399 writeb(0, port->membase + MCFUART_UIMR);
400
401 if (request_irq(port->irq, mcf_interrupt, 0, "UART", port))
402 printk(KERN_ERR "MCF: unable to attach ColdFire UART %d "
403 "interrupt vector=%d\n", port->line, port->irq);
404}
405
406
407
408static const char *mcf_type(struct uart_port *port)
409{
410 return (port->type == PORT_MCF) ? "ColdFire UART" : NULL;
411}
412
413
414
415static int mcf_request_port(struct uart_port *port)
416{
417
418 return 0;
419}
420
421
422
423static void mcf_release_port(struct uart_port *port)
424{
425
426}
427
428
429
430static int mcf_verify_port(struct uart_port *port, struct serial_struct *ser)
431{
432 if ((ser->type != PORT_UNKNOWN) && (ser->type != PORT_MCF))
433 return -EINVAL;
434 return 0;
435}
436
437
438
439
440static void mcf_config_rs485(struct uart_port *port, struct serial_rs485 *rs485)
441{
442 struct mcf_uart *pp = container_of(port, struct mcf_uart, port);
443 unsigned long flags;
444 unsigned char mr1, mr2;
445
446 spin_lock_irqsave(&port->lock, flags);
447
448 mr1 = readb(port->membase + MCFUART_UMR);
449 mr2 = readb(port->membase + MCFUART_UMR);
450 if (rs485->flags & SER_RS485_ENABLED) {
451 dev_dbg(port->dev, "Setting UART to RS485\n");
452
453 mr2 |= MCFUART_MR2_TXRTS;
454 } else {
455 dev_dbg(port->dev, "Setting UART to RS232\n");
456 mr2 &= ~MCFUART_MR2_TXRTS;
457 }
458 writeb(mr1, port->membase + MCFUART_UMR);
459 writeb(mr2, port->membase + MCFUART_UMR);
460 pp->rs485 = *rs485;
461 spin_unlock_irqrestore(&port->lock, flags);
462}
463
464static int mcf_ioctl(struct uart_port *port, unsigned int cmd,
465 unsigned long arg)
466{
467 switch (cmd) {
468 case TIOCSRS485: {
469 struct serial_rs485 rs485;
470 if (copy_from_user(&rs485, (struct serial_rs485 *)arg,
471 sizeof(struct serial_rs485)))
472 return -EFAULT;
473 mcf_config_rs485(port, &rs485);
474 break;
475 }
476 case TIOCGRS485: {
477 struct mcf_uart *pp = container_of(port, struct mcf_uart, port);
478 if (copy_to_user((struct serial_rs485 *)arg, &pp->rs485,
479 sizeof(struct serial_rs485)))
480 return -EFAULT;
481 break;
482 }
483 default:
484 return -ENOIOCTLCMD;
485 }
486 return 0;
487}
488
489
490
491
492
493
494static const struct uart_ops mcf_uart_ops = {
495 .tx_empty = mcf_tx_empty,
496 .get_mctrl = mcf_get_mctrl,
497 .set_mctrl = mcf_set_mctrl,
498 .start_tx = mcf_start_tx,
499 .stop_tx = mcf_stop_tx,
500 .stop_rx = mcf_stop_rx,
501 .enable_ms = mcf_enable_ms,
502 .break_ctl = mcf_break_ctl,
503 .startup = mcf_startup,
504 .shutdown = mcf_shutdown,
505 .set_termios = mcf_set_termios,
506 .type = mcf_type,
507 .request_port = mcf_request_port,
508 .release_port = mcf_release_port,
509 .config_port = mcf_config_port,
510 .verify_port = mcf_verify_port,
511 .ioctl = mcf_ioctl,
512};
513
514static struct mcf_uart mcf_ports[4];
515
516#define MCF_MAXPORTS ARRAY_SIZE(mcf_ports)
517
518
519#if defined(CONFIG_SERIAL_MCF_CONSOLE)
520
521
522int __init early_mcf_setup(struct mcf_platform_uart *platp)
523{
524 struct uart_port *port;
525 int i;
526
527 for (i = 0; ((i < MCF_MAXPORTS) && (platp[i].mapbase)); i++) {
528 port = &mcf_ports[i].port;
529
530 port->line = i;
531 port->type = PORT_MCF;
532 port->mapbase = platp[i].mapbase;
533 port->membase = (platp[i].membase) ? platp[i].membase :
534 (unsigned char __iomem *) port->mapbase;
535 port->iotype = SERIAL_IO_MEM;
536 port->irq = platp[i].irq;
537 port->uartclk = MCF_BUSCLK;
538 port->flags = ASYNC_BOOT_AUTOCONF;
539 port->ops = &mcf_uart_ops;
540 }
541
542 return 0;
543}
544
545
546
547static void mcf_console_putc(struct console *co, const char c)
548{
549 struct uart_port *port = &(mcf_ports + co->index)->port;
550 int i;
551
552 for (i = 0; (i < 0x10000); i++) {
553 if (readb(port->membase + MCFUART_USR) & MCFUART_USR_TXREADY)
554 break;
555 }
556 writeb(c, port->membase + MCFUART_UTB);
557 for (i = 0; (i < 0x10000); i++) {
558 if (readb(port->membase + MCFUART_USR) & MCFUART_USR_TXREADY)
559 break;
560 }
561}
562
563
564
565static void mcf_console_write(struct console *co, const char *s, unsigned int count)
566{
567 for (; (count); count--, s++) {
568 mcf_console_putc(co, *s);
569 if (*s == '\n')
570 mcf_console_putc(co, '\r');
571 }
572}
573
574
575
576static int __init mcf_console_setup(struct console *co, char *options)
577{
578 struct uart_port *port;
579 int baud = CONFIG_SERIAL_MCF_BAUDRATE;
580 int bits = 8;
581 int parity = 'n';
582 int flow = 'n';
583
584 if ((co->index < 0) || (co->index >= MCF_MAXPORTS))
585 co->index = 0;
586 port = &mcf_ports[co->index].port;
587 if (port->membase == 0)
588 return -ENODEV;
589
590 if (options)
591 uart_parse_options(options, &baud, &parity, &bits, &flow);
592
593 return uart_set_options(port, co, baud, parity, bits, flow);
594}
595
596
597
598static struct uart_driver mcf_driver;
599
600static struct console mcf_console = {
601 .name = "ttyS",
602 .write = mcf_console_write,
603 .device = uart_console_device,
604 .setup = mcf_console_setup,
605 .flags = CON_PRINTBUFFER,
606 .index = -1,
607 .data = &mcf_driver,
608};
609
610static int __init mcf_console_init(void)
611{
612 register_console(&mcf_console);
613 return 0;
614}
615
616console_initcall(mcf_console_init);
617
618#define MCF_CONSOLE &mcf_console
619
620
621#else
622
623
624#define MCF_CONSOLE NULL
625
626
627#endif
628
629
630
631
632
633static struct uart_driver mcf_driver = {
634 .owner = THIS_MODULE,
635 .driver_name = "mcf",
636 .dev_name = "ttyS",
637 .major = TTY_MAJOR,
638 .minor = 64,
639 .nr = MCF_MAXPORTS,
640 .cons = MCF_CONSOLE,
641};
642
643
644
645static int mcf_probe(struct platform_device *pdev)
646{
647 struct mcf_platform_uart *platp = pdev->dev.platform_data;
648 struct uart_port *port;
649 int i;
650
651 for (i = 0; ((i < MCF_MAXPORTS) && (platp[i].mapbase)); i++) {
652 port = &mcf_ports[i].port;
653
654 port->line = i;
655 port->type = PORT_MCF;
656 port->mapbase = platp[i].mapbase;
657 port->membase = (platp[i].membase) ? platp[i].membase :
658 (unsigned char __iomem *) platp[i].mapbase;
659 port->iotype = SERIAL_IO_MEM;
660 port->irq = platp[i].irq;
661 port->uartclk = MCF_BUSCLK;
662 port->ops = &mcf_uart_ops;
663 port->flags = ASYNC_BOOT_AUTOCONF;
664
665 uart_add_one_port(&mcf_driver, port);
666 }
667
668 return 0;
669}
670
671
672
673static int mcf_remove(struct platform_device *pdev)
674{
675 struct uart_port *port;
676 int i;
677
678 for (i = 0; (i < MCF_MAXPORTS); i++) {
679 port = &mcf_ports[i].port;
680 if (port)
681 uart_remove_one_port(&mcf_driver, port);
682 }
683
684 return 0;
685}
686
687
688
689static struct platform_driver mcf_platform_driver = {
690 .probe = mcf_probe,
691 .remove = mcf_remove,
692 .driver = {
693 .name = "mcfuart",
694 .owner = THIS_MODULE,
695 },
696};
697
698
699
700static int __init mcf_init(void)
701{
702 int rc;
703
704 printk("ColdFire internal UART serial driver\n");
705
706 rc = uart_register_driver(&mcf_driver);
707 if (rc)
708 return rc;
709 rc = platform_driver_register(&mcf_platform_driver);
710 if (rc) {
711 uart_unregister_driver(&mcf_driver);
712 return rc;
713 }
714 return 0;
715}
716
717
718
719static void __exit mcf_exit(void)
720{
721 platform_driver_unregister(&mcf_platform_driver);
722 uart_unregister_driver(&mcf_driver);
723}
724
725
726
727module_init(mcf_init);
728module_exit(mcf_exit);
729
730MODULE_AUTHOR("Greg Ungerer <gerg@snapgear.com>");
731MODULE_DESCRIPTION("Freescale ColdFire UART driver");
732MODULE_LICENSE("GPL");
733MODULE_ALIAS("platform:mcfuart");
734
735
736
