1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
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};
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 (port->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 int mcf_startup(struct uart_port *port)
153{
154 struct mcf_uart *pp = container_of(port, struct mcf_uart, port);
155 unsigned long flags;
156
157 spin_lock_irqsave(&port->lock, flags);
158
159
160 writeb(MCFUART_UCR_CMDRESETRX, port->membase + MCFUART_UCR);
161 writeb(MCFUART_UCR_CMDRESETTX, port->membase + MCFUART_UCR);
162
163
164 writeb(MCFUART_UCR_RXENABLE | MCFUART_UCR_TXENABLE,
165 port->membase + MCFUART_UCR);
166
167
168 pp->imr = MCFUART_UIR_RXREADY;
169 writeb(pp->imr, port->membase + MCFUART_UIMR);
170
171 spin_unlock_irqrestore(&port->lock, flags);
172
173 return 0;
174}
175
176
177
178static void mcf_shutdown(struct uart_port *port)
179{
180 struct mcf_uart *pp = container_of(port, struct mcf_uart, port);
181 unsigned long flags;
182
183 spin_lock_irqsave(&port->lock, flags);
184
185
186 pp->imr = 0;
187 writeb(pp->imr, port->membase + MCFUART_UIMR);
188
189
190 writeb(MCFUART_UCR_CMDRESETRX, port->membase + MCFUART_UCR);
191 writeb(MCFUART_UCR_CMDRESETTX, port->membase + MCFUART_UCR);
192
193 spin_unlock_irqrestore(&port->lock, flags);
194}
195
196
197
198static void mcf_set_termios(struct uart_port *port, struct ktermios *termios,
199 struct ktermios *old)
200{
201 unsigned long flags;
202 unsigned int baud, baudclk;
203#if defined(CONFIG_M5272)
204 unsigned int baudfr;
205#endif
206 unsigned char mr1, mr2;
207
208 baud = uart_get_baud_rate(port, termios, old, 0, 230400);
209#if defined(CONFIG_M5272)
210 baudclk = (MCF_BUSCLK / baud) / 32;
211 baudfr = (((MCF_BUSCLK / baud) + 1) / 2) % 16;
212#else
213 baudclk = ((MCF_BUSCLK / baud) + 16) / 32;
214#endif
215
216 mr1 = MCFUART_MR1_RXIRQRDY | MCFUART_MR1_RXERRCHAR;
217 mr2 = 0;
218
219 switch (termios->c_cflag & CSIZE) {
220 case CS5: mr1 |= MCFUART_MR1_CS5; break;
221 case CS6: mr1 |= MCFUART_MR1_CS6; break;
222 case CS7: mr1 |= MCFUART_MR1_CS7; break;
223 case CS8:
224 default: mr1 |= MCFUART_MR1_CS8; break;
225 }
226
227 if (termios->c_cflag & PARENB) {
228 if (termios->c_cflag & CMSPAR) {
229 if (termios->c_cflag & PARODD)
230 mr1 |= MCFUART_MR1_PARITYMARK;
231 else
232 mr1 |= MCFUART_MR1_PARITYSPACE;
233 } else {
234 if (termios->c_cflag & PARODD)
235 mr1 |= MCFUART_MR1_PARITYODD;
236 else
237 mr1 |= MCFUART_MR1_PARITYEVEN;
238 }
239 } else {
240 mr1 |= MCFUART_MR1_PARITYNONE;
241 }
242
243
244
245
246
247
248
249 if (termios->c_cflag & CSTOPB)
250 mr2 |= MCFUART_MR2_STOP2;
251 else
252 mr2 |= MCFUART_MR2_STOP1;
253
254 if (termios->c_cflag & CRTSCTS) {
255 mr1 |= MCFUART_MR1_RXRTS;
256 mr2 |= MCFUART_MR2_TXCTS;
257 }
258
259 spin_lock_irqsave(&port->lock, flags);
260 if (port->rs485.flags & SER_RS485_ENABLED) {
261 dev_dbg(port->dev, "Setting UART to RS485\n");
262 mr2 |= MCFUART_MR2_TXRTS;
263 }
264
265 uart_update_timeout(port, termios->c_cflag, baud);
266 writeb(MCFUART_UCR_CMDRESETRX, port->membase + MCFUART_UCR);
267 writeb(MCFUART_UCR_CMDRESETTX, port->membase + MCFUART_UCR);
268 writeb(MCFUART_UCR_CMDRESETMRPTR, port->membase + MCFUART_UCR);
269 writeb(mr1, port->membase + MCFUART_UMR);
270 writeb(mr2, port->membase + MCFUART_UMR);
271 writeb((baudclk & 0xff00) >> 8, port->membase + MCFUART_UBG1);
272 writeb((baudclk & 0xff), port->membase + MCFUART_UBG2);
273#if defined(CONFIG_M5272)
274 writeb((baudfr & 0x0f), port->membase + MCFUART_UFPD);
275#endif
276 writeb(MCFUART_UCSR_RXCLKTIMER | MCFUART_UCSR_TXCLKTIMER,
277 port->membase + MCFUART_UCSR);
278 writeb(MCFUART_UCR_RXENABLE | MCFUART_UCR_TXENABLE,
279 port->membase + MCFUART_UCR);
280 spin_unlock_irqrestore(&port->lock, flags);
281}
282
283
284
285static void mcf_rx_chars(struct mcf_uart *pp)
286{
287 struct uart_port *port = &pp->port;
288 unsigned char status, ch, flag;
289
290 while ((status = readb(port->membase + MCFUART_USR)) & MCFUART_USR_RXREADY) {
291 ch = readb(port->membase + MCFUART_URB);
292 flag = TTY_NORMAL;
293 port->icount.rx++;
294
295 if (status & MCFUART_USR_RXERR) {
296 writeb(MCFUART_UCR_CMDRESETERR,
297 port->membase + MCFUART_UCR);
298
299 if (status & MCFUART_USR_RXBREAK) {
300 port->icount.brk++;
301 if (uart_handle_break(port))
302 continue;
303 } else if (status & MCFUART_USR_RXPARITY) {
304 port->icount.parity++;
305 } else if (status & MCFUART_USR_RXOVERRUN) {
306 port->icount.overrun++;
307 } else if (status & MCFUART_USR_RXFRAMING) {
308 port->icount.frame++;
309 }
310
311 status &= port->read_status_mask;
312
313 if (status & MCFUART_USR_RXBREAK)
314 flag = TTY_BREAK;
315 else if (status & MCFUART_USR_RXPARITY)
316 flag = TTY_PARITY;
317 else if (status & MCFUART_USR_RXFRAMING)
318 flag = TTY_FRAME;
319 }
320
321 if (uart_handle_sysrq_char(port, ch))
322 continue;
323 uart_insert_char(port, status, MCFUART_USR_RXOVERRUN, ch, flag);
324 }
325
326 spin_unlock(&port->lock);
327 tty_flip_buffer_push(&port->state->port);
328 spin_lock(&port->lock);
329}
330
331
332
333static void mcf_tx_chars(struct mcf_uart *pp)
334{
335 struct uart_port *port = &pp->port;
336 struct circ_buf *xmit = &port->state->xmit;
337
338 if (port->x_char) {
339
340 writeb(port->x_char, port->membase + MCFUART_UTB);
341 port->x_char = 0;
342 port->icount.tx++;
343 return;
344 }
345
346 while (readb(port->membase + MCFUART_USR) & MCFUART_USR_TXREADY) {
347 if (xmit->head == xmit->tail)
348 break;
349 writeb(xmit->buf[xmit->tail], port->membase + MCFUART_UTB);
350 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE -1);
351 port->icount.tx++;
352 }
353
354 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
355 uart_write_wakeup(port);
356
357 if (xmit->head == xmit->tail) {
358 pp->imr &= ~MCFUART_UIR_TXREADY;
359 writeb(pp->imr, port->membase + MCFUART_UIMR);
360
361 if (port->rs485.flags & SER_RS485_ENABLED)
362 writeb(MCFUART_UCR_TXDISABLE,
363 port->membase + MCFUART_UCR);
364 }
365}
366
367
368
369static irqreturn_t mcf_interrupt(int irq, void *data)
370{
371 struct uart_port *port = data;
372 struct mcf_uart *pp = container_of(port, struct mcf_uart, port);
373 unsigned int isr;
374 irqreturn_t ret = IRQ_NONE;
375
376 isr = readb(port->membase + MCFUART_UISR) & pp->imr;
377
378 spin_lock(&port->lock);
379 if (isr & MCFUART_UIR_RXREADY) {
380 mcf_rx_chars(pp);
381 ret = IRQ_HANDLED;
382 }
383 if (isr & MCFUART_UIR_TXREADY) {
384 mcf_tx_chars(pp);
385 ret = IRQ_HANDLED;
386 }
387 spin_unlock(&port->lock);
388
389 return ret;
390}
391
392
393
394static void mcf_config_port(struct uart_port *port, int flags)
395{
396 port->type = PORT_MCF;
397 port->fifosize = MCFUART_TXFIFOSIZE;
398
399
400 writeb(0, port->membase + MCFUART_UIMR);
401
402 if (request_irq(port->irq, mcf_interrupt, 0, "UART", port))
403 printk(KERN_ERR "MCF: unable to attach ColdFire UART %d "
404 "interrupt vector=%d\n", port->line, port->irq);
405}
406
407
408
409static const char *mcf_type(struct uart_port *port)
410{
411 return (port->type == PORT_MCF) ? "ColdFire UART" : NULL;
412}
413
414
415
416static int mcf_request_port(struct uart_port *port)
417{
418
419 return 0;
420}
421
422
423
424static void mcf_release_port(struct uart_port *port)
425{
426
427}
428
429
430
431static int mcf_verify_port(struct uart_port *port, struct serial_struct *ser)
432{
433 if ((ser->type != PORT_UNKNOWN) && (ser->type != PORT_MCF))
434 return -EINVAL;
435 return 0;
436}
437
438
439
440
441static int mcf_config_rs485(struct uart_port *port, struct serial_rs485 *rs485)
442{
443 unsigned char mr1, mr2;
444
445
446 mr1 = readb(port->membase + MCFUART_UMR);
447 mr2 = readb(port->membase + MCFUART_UMR);
448 if (rs485->flags & SER_RS485_ENABLED) {
449 dev_dbg(port->dev, "Setting UART to RS485\n");
450
451 mr2 |= MCFUART_MR2_TXRTS;
452 } else {
453 dev_dbg(port->dev, "Setting UART to RS232\n");
454 mr2 &= ~MCFUART_MR2_TXRTS;
455 }
456 writeb(mr1, port->membase + MCFUART_UMR);
457 writeb(mr2, port->membase + MCFUART_UMR);
458 port->rs485 = *rs485;
459
460 return 0;
461}
462
463
464
465
466
467
468static const struct uart_ops mcf_uart_ops = {
469 .tx_empty = mcf_tx_empty,
470 .get_mctrl = mcf_get_mctrl,
471 .set_mctrl = mcf_set_mctrl,
472 .start_tx = mcf_start_tx,
473 .stop_tx = mcf_stop_tx,
474 .stop_rx = mcf_stop_rx,
475 .break_ctl = mcf_break_ctl,
476 .startup = mcf_startup,
477 .shutdown = mcf_shutdown,
478 .set_termios = mcf_set_termios,
479 .type = mcf_type,
480 .request_port = mcf_request_port,
481 .release_port = mcf_release_port,
482 .config_port = mcf_config_port,
483 .verify_port = mcf_verify_port,
484};
485
486static struct mcf_uart mcf_ports[4];
487
488#define MCF_MAXPORTS ARRAY_SIZE(mcf_ports)
489
490
491#if defined(CONFIG_SERIAL_MCF_CONSOLE)
492
493
494int __init early_mcf_setup(struct mcf_platform_uart *platp)
495{
496 struct uart_port *port;
497 int i;
498
499 for (i = 0; ((i < MCF_MAXPORTS) && (platp[i].mapbase)); i++) {
500 port = &mcf_ports[i].port;
501
502 port->line = i;
503 port->type = PORT_MCF;
504 port->mapbase = platp[i].mapbase;
505 port->membase = (platp[i].membase) ? platp[i].membase :
506 (unsigned char __iomem *) port->mapbase;
507 port->iotype = SERIAL_IO_MEM;
508 port->irq = platp[i].irq;
509 port->uartclk = MCF_BUSCLK;
510 port->flags = UPF_BOOT_AUTOCONF;
511 port->rs485_config = mcf_config_rs485;
512 port->ops = &mcf_uart_ops;
513 }
514
515 return 0;
516}
517
518
519
520static void mcf_console_putc(struct console *co, const char c)
521{
522 struct uart_port *port = &(mcf_ports + co->index)->port;
523 int i;
524
525 for (i = 0; (i < 0x10000); i++) {
526 if (readb(port->membase + MCFUART_USR) & MCFUART_USR_TXREADY)
527 break;
528 }
529 writeb(c, port->membase + MCFUART_UTB);
530 for (i = 0; (i < 0x10000); i++) {
531 if (readb(port->membase + MCFUART_USR) & MCFUART_USR_TXREADY)
532 break;
533 }
534}
535
536
537
538static void mcf_console_write(struct console *co, const char *s, unsigned int count)
539{
540 for (; (count); count--, s++) {
541 mcf_console_putc(co, *s);
542 if (*s == '\n')
543 mcf_console_putc(co, '\r');
544 }
545}
546
547
548
549static int __init mcf_console_setup(struct console *co, char *options)
550{
551 struct uart_port *port;
552 int baud = CONFIG_SERIAL_MCF_BAUDRATE;
553 int bits = 8;
554 int parity = 'n';
555 int flow = 'n';
556
557 if ((co->index < 0) || (co->index >= MCF_MAXPORTS))
558 co->index = 0;
559 port = &mcf_ports[co->index].port;
560 if (port->membase == 0)
561 return -ENODEV;
562
563 if (options)
564 uart_parse_options(options, &baud, &parity, &bits, &flow);
565
566 return uart_set_options(port, co, baud, parity, bits, flow);
567}
568
569
570
571static struct uart_driver mcf_driver;
572
573static struct console mcf_console = {
574 .name = "ttyS",
575 .write = mcf_console_write,
576 .device = uart_console_device,
577 .setup = mcf_console_setup,
578 .flags = CON_PRINTBUFFER,
579 .index = -1,
580 .data = &mcf_driver,
581};
582
583static int __init mcf_console_init(void)
584{
585 register_console(&mcf_console);
586 return 0;
587}
588
589console_initcall(mcf_console_init);
590
591#define MCF_CONSOLE &mcf_console
592
593
594#else
595
596
597#define MCF_CONSOLE NULL
598
599
600#endif
601
602
603
604
605
606static struct uart_driver mcf_driver = {
607 .owner = THIS_MODULE,
608 .driver_name = "mcf",
609 .dev_name = "ttyS",
610 .major = TTY_MAJOR,
611 .minor = 64,
612 .nr = MCF_MAXPORTS,
613 .cons = MCF_CONSOLE,
614};
615
616
617
618static int mcf_probe(struct platform_device *pdev)
619{
620 struct mcf_platform_uart *platp = dev_get_platdata(&pdev->dev);
621 struct uart_port *port;
622 int i;
623
624 for (i = 0; ((i < MCF_MAXPORTS) && (platp[i].mapbase)); i++) {
625 port = &mcf_ports[i].port;
626
627 port->line = i;
628 port->type = PORT_MCF;
629 port->mapbase = platp[i].mapbase;
630 port->membase = (platp[i].membase) ? platp[i].membase :
631 (unsigned char __iomem *) platp[i].mapbase;
632 port->dev = &pdev->dev;
633 port->iotype = SERIAL_IO_MEM;
634 port->irq = platp[i].irq;
635 port->uartclk = MCF_BUSCLK;
636 port->ops = &mcf_uart_ops;
637 port->flags = UPF_BOOT_AUTOCONF;
638 port->rs485_config = mcf_config_rs485;
639
640 uart_add_one_port(&mcf_driver, port);
641 }
642
643 return 0;
644}
645
646
647
648static int mcf_remove(struct platform_device *pdev)
649{
650 struct uart_port *port;
651 int i;
652
653 for (i = 0; (i < MCF_MAXPORTS); i++) {
654 port = &mcf_ports[i].port;
655 if (port)
656 uart_remove_one_port(&mcf_driver, port);
657 }
658
659 return 0;
660}
661
662
663
664static struct platform_driver mcf_platform_driver = {
665 .probe = mcf_probe,
666 .remove = mcf_remove,
667 .driver = {
668 .name = "mcfuart",
669 },
670};
671
672
673
674static int __init mcf_init(void)
675{
676 int rc;
677
678 printk("ColdFire internal UART serial driver\n");
679
680 rc = uart_register_driver(&mcf_driver);
681 if (rc)
682 return rc;
683 rc = platform_driver_register(&mcf_platform_driver);
684 if (rc) {
685 uart_unregister_driver(&mcf_driver);
686 return rc;
687 }
688 return 0;
689}
690
691
692
693static void __exit mcf_exit(void)
694{
695 platform_driver_unregister(&mcf_platform_driver);
696 uart_unregister_driver(&mcf_driver);
697}
698
699
700
701module_init(mcf_init);
702module_exit(mcf_exit);
703
704MODULE_AUTHOR("Greg Ungerer <gerg@uclinux.org>");
705MODULE_DESCRIPTION("Freescale ColdFire UART driver");
706MODULE_LICENSE("GPL");
707MODULE_ALIAS("platform:mcfuart");
708
709
710
