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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 <linux/platform_device.h>
28#include <asm/coldfire.h>
29#include <asm/mcfsim.h>
30#include <asm/mcfuart.h>
31#include <asm/nettel.h>
32
33
34
35
36
37
38
39
40
41#if !defined(mcf_getppdcd)
42#define mcf_getppdcd(p) (1)
43#endif
44#if !defined(mcf_getppdtr)
45#define mcf_getppdtr(p) (1)
46#endif
47#if !defined(mcf_setppdtr)
48#define mcf_setppdtr(p, v) do { } while (0)
49#endif
50
51
52
53
54
55
56struct mcf_uart {
57 struct uart_port port;
58 unsigned int sigs;
59 unsigned char imr;
60 struct serial_rs485 rs485;
61};
62
63
64
65static unsigned int mcf_tx_empty(struct uart_port *port)
66{
67 return (readb(port->membase + MCFUART_USR) & MCFUART_USR_TXEMPTY) ?
68 TIOCSER_TEMT : 0;
69}
70
71
72
73static unsigned int mcf_get_mctrl(struct uart_port *port)
74{
75 struct mcf_uart *pp = container_of(port, struct mcf_uart, port);
76 unsigned int sigs;
77
78 sigs = (readb(port->membase + MCFUART_UIPR) & MCFUART_UIPR_CTS) ?
79 0 : TIOCM_CTS;
80 sigs |= (pp->sigs & TIOCM_RTS);
81 sigs |= (mcf_getppdcd(port->line) ? TIOCM_CD : 0);
82 sigs |= (mcf_getppdtr(port->line) ? TIOCM_DTR : 0);
83
84 return sigs;
85}
86
87
88
89static void mcf_set_mctrl(struct uart_port *port, unsigned int sigs)
90{
91 struct mcf_uart *pp = container_of(port, struct mcf_uart, port);
92
93 pp->sigs = sigs;
94 mcf_setppdtr(port->line, (sigs & TIOCM_DTR));
95 if (sigs & TIOCM_RTS)
96 writeb(MCFUART_UOP_RTS, port->membase + MCFUART_UOP1);
97 else
98 writeb(MCFUART_UOP_RTS, port->membase + MCFUART_UOP0);
99}
100
101
102
103static void mcf_start_tx(struct uart_port *port)
104{
105 struct mcf_uart *pp = container_of(port, struct mcf_uart, port);
106
107 if (pp->rs485.flags & SER_RS485_ENABLED) {
108
109 writeb(MCFUART_UCR_TXENABLE, port->membase + MCFUART_UCR);
110
111 writeb(MCFUART_UOP_RTS, port->membase + MCFUART_UOP1);
112 }
113 pp->imr |= MCFUART_UIR_TXREADY;
114 writeb(pp->imr, port->membase + MCFUART_UIMR);
115}
116
117
118
119static void mcf_stop_tx(struct uart_port *port)
120{
121 struct mcf_uart *pp = container_of(port, struct mcf_uart, port);
122
123 pp->imr &= ~MCFUART_UIR_TXREADY;
124 writeb(pp->imr, port->membase + MCFUART_UIMR);
125}
126
127
128
129static void mcf_stop_rx(struct uart_port *port)
130{
131 struct mcf_uart *pp = container_of(port, struct mcf_uart, port);
132
133 pp->imr &= ~MCFUART_UIR_RXREADY;
134 writeb(pp->imr, port->membase + MCFUART_UIMR);
135}
136
137
138
139static void mcf_break_ctl(struct uart_port *port, int break_state)
140{
141 unsigned long flags;
142
143 spin_lock_irqsave(&port->lock, flags);
144 if (break_state == -1)
145 writeb(MCFUART_UCR_CMDBREAKSTART, port->membase + MCFUART_UCR);
146 else
147 writeb(MCFUART_UCR_CMDBREAKSTOP, port->membase + MCFUART_UCR);
148 spin_unlock_irqrestore(&port->lock, flags);
149}
150
151
152
153static void mcf_enable_ms(struct uart_port *port)
154{
155}
156
157
158
159static int mcf_startup(struct uart_port *port)
160{
161 struct mcf_uart *pp = container_of(port, struct mcf_uart, port);
162 unsigned long flags;
163
164 spin_lock_irqsave(&port->lock, flags);
165
166
167 writeb(MCFUART_UCR_CMDRESETRX, port->membase + MCFUART_UCR);
168 writeb(MCFUART_UCR_CMDRESETTX, port->membase + MCFUART_UCR);
169
170
171 writeb(MCFUART_UCR_RXENABLE | MCFUART_UCR_TXENABLE,
172 port->membase + MCFUART_UCR);
173
174
175 pp->imr = MCFUART_UIR_RXREADY;
176 writeb(pp->imr, port->membase + MCFUART_UIMR);
177
178 spin_unlock_irqrestore(&port->lock, flags);
179
180 return 0;
181}
182
183
184
185static void mcf_shutdown(struct uart_port *port)
186{
187 struct mcf_uart *pp = container_of(port, struct mcf_uart, port);
188 unsigned long flags;
189
190 spin_lock_irqsave(&port->lock, flags);
191
192
193 pp->imr = 0;
194 writeb(pp->imr, port->membase + MCFUART_UIMR);
195
196
197 writeb(MCFUART_UCR_CMDRESETRX, port->membase + MCFUART_UCR);
198 writeb(MCFUART_UCR_CMDRESETTX, port->membase + MCFUART_UCR);
199
200 spin_unlock_irqrestore(&port->lock, flags);
201}
202
203
204
205static void mcf_set_termios(struct uart_port *port, struct ktermios *termios,
206 struct ktermios *old)
207{
208 struct mcf_uart *pp = container_of(port, struct mcf_uart, port);
209 unsigned long flags;
210 unsigned int baud, baudclk;
211#if defined(CONFIG_M5272)
212 unsigned int baudfr;
213#endif
214 unsigned char mr1, mr2;
215
216 baud = uart_get_baud_rate(port, termios, old, 0, 230400);
217#if defined(CONFIG_M5272)
218 baudclk = (MCF_BUSCLK / baud) / 32;
219 baudfr = (((MCF_BUSCLK / baud) + 1) / 2) % 16;
220#else
221 baudclk = ((MCF_BUSCLK / baud) + 16) / 32;
222#endif
223
224 mr1 = MCFUART_MR1_RXIRQRDY | MCFUART_MR1_RXERRCHAR;
225 mr2 = 0;
226
227 switch (termios->c_cflag & CSIZE) {
228 case CS5: mr1 |= MCFUART_MR1_CS5; break;
229 case CS6: mr1 |= MCFUART_MR1_CS6; break;
230 case CS7: mr1 |= MCFUART_MR1_CS7; break;
231 case CS8:
232 default: mr1 |= MCFUART_MR1_CS8; break;
233 }
234
235 if (termios->c_cflag & PARENB) {
236 if (termios->c_cflag & CMSPAR) {
237 if (termios->c_cflag & PARODD)
238 mr1 |= MCFUART_MR1_PARITYMARK;
239 else
240 mr1 |= MCFUART_MR1_PARITYSPACE;
241 } else {
242 if (termios->c_cflag & PARODD)
243 mr1 |= MCFUART_MR1_PARITYODD;
244 else
245 mr1 |= MCFUART_MR1_PARITYEVEN;
246 }
247 } else {
248 mr1 |= MCFUART_MR1_PARITYNONE;
249 }
250
251 if (termios->c_cflag & CSTOPB)
252 mr2 |= MCFUART_MR2_STOP2;
253 else
254 mr2 |= MCFUART_MR2_STOP1;
255
256 if (termios->c_cflag & CRTSCTS) {
257 mr1 |= MCFUART_MR1_RXRTS;
258 mr2 |= MCFUART_MR2_TXCTS;
259 }
260
261 if (pp->rs485.flags & SER_RS485_ENABLED) {
262 dev_dbg(port->dev, "Setting UART to RS485\n");
263 mr2 |= MCFUART_MR2_TXRTS;
264 }
265
266 spin_lock_irqsave(&port->lock, flags);
267 uart_update_timeout(port, termios->c_cflag, baud);
268 writeb(MCFUART_UCR_CMDRESETRX, port->membase + MCFUART_UCR);
269 writeb(MCFUART_UCR_CMDRESETTX, port->membase + MCFUART_UCR);
270 writeb(MCFUART_UCR_CMDRESETMRPTR, port->membase + MCFUART_UCR);
271 writeb(mr1, port->membase + MCFUART_UMR);
272 writeb(mr2, port->membase + MCFUART_UMR);
273 writeb((baudclk & 0xff00) >> 8, port->membase + MCFUART_UBG1);
274 writeb((baudclk & 0xff), port->membase + MCFUART_UBG2);
275#if defined(CONFIG_M5272)
276 writeb((baudfr & 0x0f), port->membase + MCFUART_UFPD);
277#endif
278 writeb(MCFUART_UCSR_RXCLKTIMER | MCFUART_UCSR_TXCLKTIMER,
279 port->membase + MCFUART_UCSR);
280 writeb(MCFUART_UCR_RXENABLE | MCFUART_UCR_TXENABLE,
281 port->membase + MCFUART_UCR);
282 spin_unlock_irqrestore(&port->lock, flags);
283}
284
285
286
287static void mcf_rx_chars(struct mcf_uart *pp)
288{
289 struct uart_port *port = &pp->port;
290 unsigned char status, ch, flag;
291
292 while ((status = readb(port->membase + MCFUART_USR)) & MCFUART_USR_RXREADY) {
293 ch = readb(port->membase + MCFUART_URB);
294 flag = TTY_NORMAL;
295 port->icount.rx++;
296
297 if (status & MCFUART_USR_RXERR) {
298 writeb(MCFUART_UCR_CMDRESETERR,
299 port->membase + MCFUART_UCR);
300
301 if (status & MCFUART_USR_RXBREAK) {
302 port->icount.brk++;
303 if (uart_handle_break(port))
304 continue;
305 } else if (status & MCFUART_USR_RXPARITY) {
306 port->icount.parity++;
307 } else if (status & MCFUART_USR_RXOVERRUN) {
308 port->icount.overrun++;
309 } else if (status & MCFUART_USR_RXFRAMING) {
310 port->icount.frame++;
311 }
312
313 status &= port->read_status_mask;
314
315 if (status & MCFUART_USR_RXBREAK)
316 flag = TTY_BREAK;
317 else if (status & MCFUART_USR_RXPARITY)
318 flag = TTY_PARITY;
319 else if (status & MCFUART_USR_RXFRAMING)
320 flag = TTY_FRAME;
321 }
322
323 if (uart_handle_sysrq_char(port, ch))
324 continue;
325 uart_insert_char(port, status, MCFUART_USR_RXOVERRUN, ch, flag);
326 }
327
328 spin_unlock(&port->lock);
329 tty_flip_buffer_push(&port->state->port);
330 spin_lock(&port->lock);
331}
332
333
334
335static void mcf_tx_chars(struct mcf_uart *pp)
336{
337 struct uart_port *port = &pp->port;
338 struct circ_buf *xmit = &port->state->xmit;
339
340 if (port->x_char) {
341
342 writeb(port->x_char, port->membase + MCFUART_UTB);
343 port->x_char = 0;
344 port->icount.tx++;
345 return;
346 }
347
348 while (readb(port->membase + MCFUART_USR) & MCFUART_USR_TXREADY) {
349 if (xmit->head == xmit->tail)
350 break;
351 writeb(xmit->buf[xmit->tail], port->membase + MCFUART_UTB);
352 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE -1);
353 port->icount.tx++;
354 }
355
356 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
357 uart_write_wakeup(port);
358
359 if (xmit->head == xmit->tail) {
360 pp->imr &= ~MCFUART_UIR_TXREADY;
361 writeb(pp->imr, port->membase + MCFUART_UIMR);
362
363 if (pp->rs485.flags & SER_RS485_ENABLED)
364 writeb(MCFUART_UCR_TXDISABLE,
365 port->membase + MCFUART_UCR);
366 }
367}
368
369
370
371static irqreturn_t mcf_interrupt(int irq, void *data)
372{
373 struct uart_port *port = data;
374 struct mcf_uart *pp = container_of(port, struct mcf_uart, port);
375 unsigned int isr;
376 irqreturn_t ret = IRQ_NONE;
377
378 isr = readb(port->membase + MCFUART_UISR) & pp->imr;
379
380 spin_lock(&port->lock);
381 if (isr & MCFUART_UIR_RXREADY) {
382 mcf_rx_chars(pp);
383 ret = IRQ_HANDLED;
384 }
385 if (isr & MCFUART_UIR_TXREADY) {
386 mcf_tx_chars(pp);
387 ret = IRQ_HANDLED;
388 }
389 spin_unlock(&port->lock);
390
391 return ret;
392}
393
394
395
396static void mcf_config_port(struct uart_port *port, int flags)
397{
398 port->type = PORT_MCF;
399 port->fifosize = MCFUART_TXFIFOSIZE;
400
401
402 writeb(0, port->membase + MCFUART_UIMR);
403
404 if (request_irq(port->irq, mcf_interrupt, 0, "UART", port))
405 printk(KERN_ERR "MCF: unable to attach ColdFire UART %d "
406 "interrupt vector=%d\n", port->line, port->irq);
407}
408
409
410
411static const char *mcf_type(struct uart_port *port)
412{
413 return (port->type == PORT_MCF) ? "ColdFire UART" : NULL;
414}
415
416
417
418static int mcf_request_port(struct uart_port *port)
419{
420
421 return 0;
422}
423
424
425
426static void mcf_release_port(struct uart_port *port)
427{
428
429}
430
431
432
433static int mcf_verify_port(struct uart_port *port, struct serial_struct *ser)
434{
435 if ((ser->type != PORT_UNKNOWN) && (ser->type != PORT_MCF))
436 return -EINVAL;
437 return 0;
438}
439
440
441
442
443static void mcf_config_rs485(struct uart_port *port, struct serial_rs485 *rs485)
444{
445 struct mcf_uart *pp = container_of(port, struct mcf_uart, port);
446 unsigned long flags;
447 unsigned char mr1, mr2;
448
449 spin_lock_irqsave(&port->lock, flags);
450
451 mr1 = readb(port->membase + MCFUART_UMR);
452 mr2 = readb(port->membase + MCFUART_UMR);
453 if (rs485->flags & SER_RS485_ENABLED) {
454 dev_dbg(port->dev, "Setting UART to RS485\n");
455
456 mr2 |= MCFUART_MR2_TXRTS;
457 } else {
458 dev_dbg(port->dev, "Setting UART to RS232\n");
459 mr2 &= ~MCFUART_MR2_TXRTS;
460 }
461 writeb(mr1, port->membase + MCFUART_UMR);
462 writeb(mr2, port->membase + MCFUART_UMR);
463 pp->rs485 = *rs485;
464 spin_unlock_irqrestore(&port->lock, flags);
465}
466
467static int mcf_ioctl(struct uart_port *port, unsigned int cmd,
468 unsigned long arg)
469{
470 switch (cmd) {
471 case TIOCSRS485: {
472 struct serial_rs485 rs485;
473 if (copy_from_user(&rs485, (struct serial_rs485 *)arg,
474 sizeof(struct serial_rs485)))
475 return -EFAULT;
476 mcf_config_rs485(port, &rs485);
477 break;
478 }
479 case TIOCGRS485: {
480 struct mcf_uart *pp = container_of(port, struct mcf_uart, port);
481 if (copy_to_user((struct serial_rs485 *)arg, &pp->rs485,
482 sizeof(struct serial_rs485)))
483 return -EFAULT;
484 break;
485 }
486 default:
487 return -ENOIOCTLCMD;
488 }
489 return 0;
490}
491
492
493
494
495
496
497static const struct uart_ops mcf_uart_ops = {
498 .tx_empty = mcf_tx_empty,
499 .get_mctrl = mcf_get_mctrl,
500 .set_mctrl = mcf_set_mctrl,
501 .start_tx = mcf_start_tx,
502 .stop_tx = mcf_stop_tx,
503 .stop_rx = mcf_stop_rx,
504 .enable_ms = mcf_enable_ms,
505 .break_ctl = mcf_break_ctl,
506 .startup = mcf_startup,
507 .shutdown = mcf_shutdown,
508 .set_termios = mcf_set_termios,
509 .type = mcf_type,
510 .request_port = mcf_request_port,
511 .release_port = mcf_release_port,
512 .config_port = mcf_config_port,
513 .verify_port = mcf_verify_port,
514 .ioctl = mcf_ioctl,
515};
516
517static struct mcf_uart mcf_ports[4];
518
519#define MCF_MAXPORTS ARRAY_SIZE(mcf_ports)
520
521
522#if defined(CONFIG_SERIAL_MCF_CONSOLE)
523
524
525int __init early_mcf_setup(struct mcf_platform_uart *platp)
526{
527 struct uart_port *port;
528 int i;
529
530 for (i = 0; ((i < MCF_MAXPORTS) && (platp[i].mapbase)); i++) {
531 port = &mcf_ports[i].port;
532
533 port->line = i;
534 port->type = PORT_MCF;
535 port->mapbase = platp[i].mapbase;
536 port->membase = (platp[i].membase) ? platp[i].membase :
537 (unsigned char __iomem *) port->mapbase;
538 port->iotype = SERIAL_IO_MEM;
539 port->irq = platp[i].irq;
540 port->uartclk = MCF_BUSCLK;
541 port->flags = ASYNC_BOOT_AUTOCONF;
542 port->ops = &mcf_uart_ops;
543 }
544
545 return 0;
546}
547
548
549
550static void mcf_console_putc(struct console *co, const char c)
551{
552 struct uart_port *port = &(mcf_ports + co->index)->port;
553 int i;
554
555 for (i = 0; (i < 0x10000); i++) {
556 if (readb(port->membase + MCFUART_USR) & MCFUART_USR_TXREADY)
557 break;
558 }
559 writeb(c, port->membase + MCFUART_UTB);
560 for (i = 0; (i < 0x10000); i++) {
561 if (readb(port->membase + MCFUART_USR) & MCFUART_USR_TXREADY)
562 break;
563 }
564}
565
566
567
568static void mcf_console_write(struct console *co, const char *s, unsigned int count)
569{
570 for (; (count); count--, s++) {
571 mcf_console_putc(co, *s);
572 if (*s == '\n')
573 mcf_console_putc(co, '\r');
574 }
575}
576
577
578
579static int __init mcf_console_setup(struct console *co, char *options)
580{
581 struct uart_port *port;
582 int baud = CONFIG_SERIAL_MCF_BAUDRATE;
583 int bits = 8;
584 int parity = 'n';
585 int flow = 'n';
586
587 if ((co->index < 0) || (co->index >= MCF_MAXPORTS))
588 co->index = 0;
589 port = &mcf_ports[co->index].port;
590 if (port->membase == 0)
591 return -ENODEV;
592
593 if (options)
594 uart_parse_options(options, &baud, &parity, &bits, &flow);
595
596 return uart_set_options(port, co, baud, parity, bits, flow);
597}
598
599
600
601static struct uart_driver mcf_driver;
602
603static struct console mcf_console = {
604 .name = "ttyS",
605 .write = mcf_console_write,
606 .device = uart_console_device,
607 .setup = mcf_console_setup,
608 .flags = CON_PRINTBUFFER,
609 .index = -1,
610 .data = &mcf_driver,
611};
612
613static int __init mcf_console_init(void)
614{
615 register_console(&mcf_console);
616 return 0;
617}
618
619console_initcall(mcf_console_init);
620
621#define MCF_CONSOLE &mcf_console
622
623
624#else
625
626
627#define MCF_CONSOLE NULL
628
629
630#endif
631
632
633
634
635
636static struct uart_driver mcf_driver = {
637 .owner = THIS_MODULE,
638 .driver_name = "mcf",
639 .dev_name = "ttyS",
640 .major = TTY_MAJOR,
641 .minor = 64,
642 .nr = MCF_MAXPORTS,
643 .cons = MCF_CONSOLE,
644};
645
646
647
648static int mcf_probe(struct platform_device *pdev)
649{
650 struct mcf_platform_uart *platp = dev_get_platdata(&pdev->dev);
651 struct uart_port *port;
652 int i;
653
654 for (i = 0; ((i < MCF_MAXPORTS) && (platp[i].mapbase)); i++) {
655 port = &mcf_ports[i].port;
656
657 port->line = i;
658 port->type = PORT_MCF;
659 port->mapbase = platp[i].mapbase;
660 port->membase = (platp[i].membase) ? platp[i].membase :
661 (unsigned char __iomem *) platp[i].mapbase;
662 port->iotype = SERIAL_IO_MEM;
663 port->irq = platp[i].irq;
664 port->uartclk = MCF_BUSCLK;
665 port->ops = &mcf_uart_ops;
666 port->flags = ASYNC_BOOT_AUTOCONF;
667
668 uart_add_one_port(&mcf_driver, port);
669 }
670
671 return 0;
672}
673
674
675
676static int mcf_remove(struct platform_device *pdev)
677{
678 struct uart_port *port;
679 int i;
680
681 for (i = 0; (i < MCF_MAXPORTS); i++) {
682 port = &mcf_ports[i].port;
683 if (port)
684 uart_remove_one_port(&mcf_driver, port);
685 }
686
687 return 0;
688}
689
690
691
692static struct platform_driver mcf_platform_driver = {
693 .probe = mcf_probe,
694 .remove = mcf_remove,
695 .driver = {
696 .name = "mcfuart",
697 .owner = THIS_MODULE,
698 },
699};
700
701
702
703static int __init mcf_init(void)
704{
705 int rc;
706
707 printk("ColdFire internal UART serial driver\n");
708
709 rc = uart_register_driver(&mcf_driver);
710 if (rc)
711 return rc;
712 rc = platform_driver_register(&mcf_platform_driver);
713 if (rc) {
714 uart_unregister_driver(&mcf_driver);
715 return rc;
716 }
717 return 0;
718}
719
720
721
722static void __exit mcf_exit(void)
723{
724 platform_driver_unregister(&mcf_platform_driver);
725 uart_unregister_driver(&mcf_driver);
726}
727
728
729
730module_init(mcf_init);
731module_exit(mcf_exit);
732
733MODULE_AUTHOR("Greg Ungerer <gerg@snapgear.com>");
734MODULE_DESCRIPTION("Freescale ColdFire UART driver");
735MODULE_LICENSE("GPL");
736MODULE_ALIAS("platform:mcfuart");
737
738
739
