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-rw-r--r--arch/mn10300/kernel/mn10300-serial.c1480
1 files changed, 1480 insertions, 0 deletions
diff --git a/arch/mn10300/kernel/mn10300-serial.c b/arch/mn10300/kernel/mn10300-serial.c
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index 000000000000..b9c268c6b2fb
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1/* MN10300 On-chip serial port UART driver
2 *
3 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public Licence
8 * as published by the Free Software Foundation; either version
9 * 2 of the Licence, or (at your option) any later version.
10 */
11
12static const char serial_name[] = "MN10300 Serial driver";
13static const char serial_version[] = "mn10300_serial-1.0";
14static const char serial_revdate[] = "2007-11-06";
15
16#if defined(CONFIG_MN10300_TTYSM_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
17#define SUPPORT_SYSRQ
18#endif
19
20#include <linux/version.h>
21#include <linux/module.h>
22#include <linux/serial.h>
23#include <linux/circ_buf.h>
24#include <linux/errno.h>
25#include <linux/signal.h>
26#include <linux/sched.h>
27#include <linux/timer.h>
28#include <linux/interrupt.h>
29#include <linux/tty.h>
30#include <linux/tty_flip.h>
31#include <linux/major.h>
32#include <linux/string.h>
33#include <linux/ioport.h>
34#include <linux/mm.h>
35#include <linux/slab.h>
36#include <linux/init.h>
37#include <linux/console.h>
38#include <linux/sysrq.h>
39
40#include <asm/system.h>
41#include <asm/io.h>
42#include <asm/irq.h>
43#include <asm/bitops.h>
44#include <asm/serial-regs.h>
45#include <asm/unit/timex.h>
46#include "mn10300-serial.h"
47
48static inline __attribute__((format(printf, 1, 2)))
49void no_printk(const char *fmt, ...)
50{
51}
52
53#define kenter(FMT, ...) \
54 printk(KERN_DEBUG "-->%s(" FMT ")\n", __func__, ##__VA_ARGS__)
55#define _enter(FMT, ...) \
56 no_printk(KERN_DEBUG "-->%s(" FMT ")\n", __func__, ##__VA_ARGS__)
57#define kdebug(FMT, ...) \
58 printk(KERN_DEBUG "--- " FMT "\n", ##__VA_ARGS__)
59#define _debug(FMT, ...) \
60 no_printk(KERN_DEBUG "--- " FMT "\n", ##__VA_ARGS__)
61#define kproto(FMT, ...) \
62 printk(KERN_DEBUG "### MNSERIAL " FMT " ###\n", ##__VA_ARGS__)
63#define _proto(FMT, ...) \
64 no_printk(KERN_DEBUG "### MNSERIAL " FMT " ###\n", ##__VA_ARGS__)
65
66#define NR_UARTS 3
67
68#ifdef CONFIG_MN10300_TTYSM_CONSOLE
69static void mn10300_serial_console_write(struct console *co,
70 const char *s, unsigned count);
71static int __init mn10300_serial_console_setup(struct console *co,
72 char *options);
73
74static struct uart_driver mn10300_serial_driver;
75static struct console mn10300_serial_console = {
76 .name = "ttySM",
77 .write = mn10300_serial_console_write,
78 .device = uart_console_device,
79 .setup = mn10300_serial_console_setup,
80 .flags = CON_PRINTBUFFER,
81 .index = -1,
82 .data = &mn10300_serial_driver,
83};
84#endif
85
86static struct uart_driver mn10300_serial_driver = {
87 .owner = NULL,
88 .driver_name = "mn10300-serial",
89 .dev_name = "ttySM",
90 .major = TTY_MAJOR,
91 .minor = 128,
92 .nr = NR_UARTS,
93#ifdef CONFIG_MN10300_TTYSM_CONSOLE
94 .cons = &mn10300_serial_console,
95#endif
96};
97
98static unsigned int mn10300_serial_tx_empty(struct uart_port *);
99static void mn10300_serial_set_mctrl(struct uart_port *, unsigned int mctrl);
100static unsigned int mn10300_serial_get_mctrl(struct uart_port *);
101static void mn10300_serial_stop_tx(struct uart_port *);
102static void mn10300_serial_start_tx(struct uart_port *);
103static void mn10300_serial_send_xchar(struct uart_port *, char ch);
104static void mn10300_serial_stop_rx(struct uart_port *);
105static void mn10300_serial_enable_ms(struct uart_port *);
106static void mn10300_serial_break_ctl(struct uart_port *, int ctl);
107static int mn10300_serial_startup(struct uart_port *);
108static void mn10300_serial_shutdown(struct uart_port *);
109static void mn10300_serial_set_termios(struct uart_port *,
110 struct ktermios *new,
111 struct ktermios *old);
112static const char *mn10300_serial_type(struct uart_port *);
113static void mn10300_serial_release_port(struct uart_port *);
114static int mn10300_serial_request_port(struct uart_port *);
115static void mn10300_serial_config_port(struct uart_port *, int);
116static int mn10300_serial_verify_port(struct uart_port *,
117 struct serial_struct *);
118
119static const struct uart_ops mn10300_serial_ops = {
120 .tx_empty = mn10300_serial_tx_empty,
121 .set_mctrl = mn10300_serial_set_mctrl,
122 .get_mctrl = mn10300_serial_get_mctrl,
123 .stop_tx = mn10300_serial_stop_tx,
124 .start_tx = mn10300_serial_start_tx,
125 .send_xchar = mn10300_serial_send_xchar,
126 .stop_rx = mn10300_serial_stop_rx,
127 .enable_ms = mn10300_serial_enable_ms,
128 .break_ctl = mn10300_serial_break_ctl,
129 .startup = mn10300_serial_startup,
130 .shutdown = mn10300_serial_shutdown,
131 .set_termios = mn10300_serial_set_termios,
132 .type = mn10300_serial_type,
133 .release_port = mn10300_serial_release_port,
134 .request_port = mn10300_serial_request_port,
135 .config_port = mn10300_serial_config_port,
136 .verify_port = mn10300_serial_verify_port,
137};
138
139static irqreturn_t mn10300_serial_interrupt(int irq, void *dev_id);
140
141/*
142 * the first on-chip serial port: ttySM0 (aka SIF0)
143 */
144#ifdef CONFIG_MN10300_TTYSM0
145struct mn10300_serial_port mn10300_serial_port_sif0 = {
146 .uart.ops = &mn10300_serial_ops,
147 .uart.membase = (void __iomem *) &SC0CTR,
148 .uart.mapbase = (unsigned long) &SC0CTR,
149 .uart.iotype = UPIO_MEM,
150 .uart.irq = 0,
151 .uart.uartclk = 0, /* MN10300_IOCLK, */
152 .uart.fifosize = 1,
153 .uart.flags = UPF_BOOT_AUTOCONF,
154 .uart.line = 0,
155 .uart.type = PORT_MN10300,
156 .uart.lock =
157 __SPIN_LOCK_UNLOCKED(mn10300_serial_port_sif0.uart.lock),
158 .name = "ttySM0",
159 ._iobase = &SC0CTR,
160 ._control = &SC0CTR,
161 ._status = (volatile u8 *) &SC0STR,
162 ._intr = &SC0ICR,
163 ._rxb = &SC0RXB,
164 ._txb = &SC0TXB,
165 .rx_name = "ttySM0/Rx",
166 .tx_name = "ttySM0/Tx",
167#ifdef CONFIG_MN10300_TTYSM0_TIMER8
168 .tm_name = "ttySM0/Timer8",
169 ._tmxmd = &TM8MD,
170 ._tmxbr = &TM8BR,
171 ._tmicr = &TM8ICR,
172 .tm_irq = TM8IRQ,
173 .div_timer = MNSCx_DIV_TIMER_16BIT,
174#else /* CONFIG_MN10300_TTYSM0_TIMER2 */
175 .tm_name = "ttySM0/Timer2",
176 ._tmxmd = &TM2MD,
177 ._tmxbr = (volatile u16 *) &TM2BR,
178 ._tmicr = &TM2ICR,
179 .tm_irq = TM2IRQ,
180 .div_timer = MNSCx_DIV_TIMER_8BIT,
181#endif
182 .rx_irq = SC0RXIRQ,
183 .tx_irq = SC0TXIRQ,
184 .rx_icr = &GxICR(SC0RXIRQ),
185 .tx_icr = &GxICR(SC0TXIRQ),
186 .clock_src = MNSCx_CLOCK_SRC_IOCLK,
187 .options = 0,
188#ifdef CONFIG_GDBSTUB_ON_TTYSM0
189 .gdbstub = 1,
190#endif
191};
192#endif /* CONFIG_MN10300_TTYSM0 */
193
194/*
195 * the second on-chip serial port: ttySM1 (aka SIF1)
196 */
197#ifdef CONFIG_MN10300_TTYSM1
198struct mn10300_serial_port mn10300_serial_port_sif1 = {
199 .uart.ops = &mn10300_serial_ops,
200 .uart.membase = (void __iomem *) &SC1CTR,
201 .uart.mapbase = (unsigned long) &SC1CTR,
202 .uart.iotype = UPIO_MEM,
203 .uart.irq = 0,
204 .uart.uartclk = 0, /* MN10300_IOCLK, */
205 .uart.fifosize = 1,
206 .uart.flags = UPF_BOOT_AUTOCONF,
207 .uart.line = 1,
208 .uart.type = PORT_MN10300,
209 .uart.lock =
210 __SPIN_LOCK_UNLOCKED(mn10300_serial_port_sif1.uart.lock),
211 .name = "ttySM1",
212 ._iobase = &SC1CTR,
213 ._control = &SC1CTR,
214 ._status = (volatile u8 *) &SC1STR,
215 ._intr = &SC1ICR,
216 ._rxb = &SC1RXB,
217 ._txb = &SC1TXB,
218 .rx_name = "ttySM1/Rx",
219 .tx_name = "ttySM1/Tx",
220#ifdef CONFIG_MN10300_TTYSM1_TIMER9
221 .tm_name = "ttySM1/Timer9",
222 ._tmxmd = &TM9MD,
223 ._tmxbr = &TM9BR,
224 ._tmicr = &TM9ICR,
225 .tm_irq = TM9IRQ,
226 .div_timer = MNSCx_DIV_TIMER_16BIT,
227#else /* CONFIG_MN10300_TTYSM1_TIMER3 */
228 .tm_name = "ttySM1/Timer3",
229 ._tmxmd = &TM3MD,
230 ._tmxbr = (volatile u16 *) &TM3BR,
231 ._tmicr = &TM3ICR,
232 .tm_irq = TM3IRQ,
233 .div_timer = MNSCx_DIV_TIMER_8BIT,
234#endif
235 .rx_irq = SC1RXIRQ,
236 .tx_irq = SC1TXIRQ,
237 .rx_icr = &GxICR(SC1RXIRQ),
238 .tx_icr = &GxICR(SC1TXIRQ),
239 .clock_src = MNSCx_CLOCK_SRC_IOCLK,
240 .options = 0,
241#ifdef CONFIG_GDBSTUB_ON_TTYSM1
242 .gdbstub = 1,
243#endif
244};
245#endif /* CONFIG_MN10300_TTYSM1 */
246
247/*
248 * the third on-chip serial port: ttySM2 (aka SIF2)
249 */
250#ifdef CONFIG_MN10300_TTYSM2
251struct mn10300_serial_port mn10300_serial_port_sif2 = {
252 .uart.ops = &mn10300_serial_ops,
253 .uart.membase = (void __iomem *) &SC2CTR,
254 .uart.mapbase = (unsigned long) &SC2CTR,
255 .uart.iotype = UPIO_MEM,
256 .uart.irq = 0,
257 .uart.uartclk = 0, /* MN10300_IOCLK, */
258 .uart.fifosize = 1,
259 .uart.flags = UPF_BOOT_AUTOCONF,
260 .uart.line = 2,
261#ifdef CONFIG_MN10300_TTYSM2_CTS
262 .uart.type = PORT_MN10300_CTS,
263#else
264 .uart.type = PORT_MN10300,
265#endif
266 .uart.lock =
267 __SPIN_LOCK_UNLOCKED(mn10300_serial_port_sif2.uart.lock),
268 .name = "ttySM2",
269 .rx_name = "ttySM2/Rx",
270 .tx_name = "ttySM2/Tx",
271 .tm_name = "ttySM2/Timer10",
272 ._iobase = &SC2CTR,
273 ._control = &SC2CTR,
274 ._status = &SC2STR,
275 ._intr = &SC2ICR,
276 ._rxb = &SC2RXB,
277 ._txb = &SC2TXB,
278 ._tmxmd = &TM10MD,
279 ._tmxbr = &TM10BR,
280 ._tmicr = &TM10ICR,
281 .tm_irq = TM10IRQ,
282 .div_timer = MNSCx_DIV_TIMER_16BIT,
283 .rx_irq = SC2RXIRQ,
284 .tx_irq = SC2TXIRQ,
285 .rx_icr = &GxICR(SC2RXIRQ),
286 .tx_icr = &GxICR(SC2TXIRQ),
287 .clock_src = MNSCx_CLOCK_SRC_IOCLK,
288#ifdef CONFIG_MN10300_TTYSM2_CTS
289 .options = MNSCx_OPT_CTS,
290#else
291 .options = 0,
292#endif
293#ifdef CONFIG_GDBSTUB_ON_TTYSM2
294 .gdbstub = 1,
295#endif
296};
297#endif /* CONFIG_MN10300_TTYSM2 */
298
299
300/*
301 * list of available serial ports
302 */
303struct mn10300_serial_port *mn10300_serial_ports[NR_UARTS + 1] = {
304#ifdef CONFIG_MN10300_TTYSM0
305 [0] = &mn10300_serial_port_sif0,
306#endif
307#ifdef CONFIG_MN10300_TTYSM1
308 [1] = &mn10300_serial_port_sif1,
309#endif
310#ifdef CONFIG_MN10300_TTYSM2
311 [2] = &mn10300_serial_port_sif2,
312#endif
313 [NR_UARTS] = NULL,
314};
315
316
317/*
318 * we abuse the serial ports' baud timers' interrupt lines to get the ability
319 * to deliver interrupts to userspace as we use the ports' interrupt lines to
320 * do virtual DMA on account of the ports having no hardware FIFOs
321 *
322 * we can generate an interrupt manually in the assembly stubs by writing to
323 * the enable and detect bits in the interrupt control register, so all we need
324 * to do here is disable the interrupt line
325 *
326 * note that we can't just leave the line enabled as the baud rate timer *also*
327 * generates interrupts
328 */
329static void mn10300_serial_mask_ack(unsigned int irq)
330{
331 u16 tmp;
332 GxICR(irq) = GxICR_LEVEL_6;
333 tmp = GxICR(irq); /* flush write buffer */
334}
335
336static void mn10300_serial_nop(unsigned int irq)
337{
338}
339
340static struct irq_chip mn10300_serial_pic = {
341 .name = "mnserial",
342 .ack = mn10300_serial_mask_ack,
343 .mask = mn10300_serial_mask_ack,
344 .mask_ack = mn10300_serial_mask_ack,
345 .unmask = mn10300_serial_nop,
346 .end = mn10300_serial_nop,
347};
348
349
350/*
351 * serial virtual DMA interrupt jump table
352 */
353struct mn10300_serial_int mn10300_serial_int_tbl[NR_IRQS];
354
355static void mn10300_serial_dis_tx_intr(struct mn10300_serial_port *port)
356{
357 u16 x;
358 *port->tx_icr = GxICR_LEVEL_1 | GxICR_DETECT;
359 x = *port->tx_icr;
360}
361
362static void mn10300_serial_en_tx_intr(struct mn10300_serial_port *port)
363{
364 u16 x;
365 *port->tx_icr = GxICR_LEVEL_1 | GxICR_ENABLE;
366 x = *port->tx_icr;
367}
368
369static void mn10300_serial_dis_rx_intr(struct mn10300_serial_port *port)
370{
371 u16 x;
372 *port->rx_icr = GxICR_LEVEL_1 | GxICR_DETECT;
373 x = *port->rx_icr;
374}
375
376/*
377 * multi-bit equivalent of test_and_clear_bit()
378 */
379static int mask_test_and_clear(volatile u8 *ptr, u8 mask)
380{
381 u32 epsw;
382 asm volatile(" bclr %1,(%2) \n"
383 " mov epsw,%0 \n"
384 : "=d"(epsw) : "d"(mask), "a"(ptr));
385 return !(epsw & EPSW_FLAG_Z);
386}
387
388/*
389 * receive chars from the ring buffer for this serial port
390 * - must do break detection here (not done in the UART)
391 */
392static void mn10300_serial_receive_interrupt(struct mn10300_serial_port *port)
393{
394 struct uart_icount *icount = &port->uart.icount;
395 struct tty_struct *tty = port->uart.info->tty;
396 unsigned ix;
397 int count;
398 u8 st, ch, push, status, overrun;
399
400 _enter("%s", port->name);
401
402 push = 0;
403
404 count = CIRC_CNT(port->rx_inp, port->rx_outp, MNSC_BUFFER_SIZE);
405 count = tty_buffer_request_room(tty, count);
406 if (count == 0) {
407 if (!tty->low_latency)
408 tty_flip_buffer_push(tty);
409 return;
410 }
411
412try_again:
413 /* pull chars out of the hat */
414 ix = port->rx_outp;
415 if (ix == port->rx_inp) {
416 if (push && !tty->low_latency)
417 tty_flip_buffer_push(tty);
418 return;
419 }
420
421 ch = port->rx_buffer[ix++];
422 st = port->rx_buffer[ix++];
423 smp_rmb();
424 port->rx_outp = ix & (MNSC_BUFFER_SIZE - 1);
425 port->uart.icount.rx++;
426
427 st &= SC01STR_FEF | SC01STR_PEF | SC01STR_OEF;
428 status = 0;
429 overrun = 0;
430
431 /* the UART doesn't detect BREAK, so we have to do that ourselves
432 * - it starts as a framing error on a NUL character
433 * - then we count another two NUL characters before issuing TTY_BREAK
434 * - then we end on a normal char or one that has all the bottom bits
435 * zero and the top bits set
436 */
437 switch (port->rx_brk) {
438 case 0:
439 /* not breaking at the moment */
440 break;
441
442 case 1:
443 if (st & SC01STR_FEF && ch == 0) {
444 port->rx_brk = 2;
445 goto try_again;
446 }
447 goto not_break;
448
449 case 2:
450 if (st & SC01STR_FEF && ch == 0) {
451 port->rx_brk = 3;
452 _proto("Rx Break Detected");
453 icount->brk++;
454 if (uart_handle_break(&port->uart))
455 goto ignore_char;
456 status |= 1 << TTY_BREAK;
457 goto insert;
458 }
459 goto not_break;
460
461 default:
462 if (st & (SC01STR_FEF | SC01STR_PEF | SC01STR_OEF))
463 goto try_again; /* still breaking */
464
465 port->rx_brk = 0; /* end of the break */
466
467 switch (ch) {
468 case 0xFF:
469 case 0xFE:
470 case 0xFC:
471 case 0xF8:
472 case 0xF0:
473 case 0xE0:
474 case 0xC0:
475 case 0x80:
476 case 0x00:
477 /* discard char at probable break end */
478 goto try_again;
479 }
480 break;
481 }
482
483process_errors:
484 /* handle framing error */
485 if (st & SC01STR_FEF) {
486 if (ch == 0) {
487 /* framing error with NUL char is probably a BREAK */
488 port->rx_brk = 1;
489 goto try_again;
490 }
491
492 _proto("Rx Framing Error");
493 icount->frame++;
494 status |= 1 << TTY_FRAME;
495 }
496
497 /* handle parity error */
498 if (st & SC01STR_PEF) {
499 _proto("Rx Parity Error");
500 icount->parity++;
501 status = TTY_PARITY;
502 }
503
504 /* handle normal char */
505 if (status == 0) {
506 if (uart_handle_sysrq_char(&port->uart, ch))
507 goto ignore_char;
508 status = (1 << TTY_NORMAL);
509 }
510
511 /* handle overrun error */
512 if (st & SC01STR_OEF) {
513 if (port->rx_brk)
514 goto try_again;
515
516 _proto("Rx Overrun Error");
517 icount->overrun++;
518 overrun = 1;
519 }
520
521insert:
522 status &= port->uart.read_status_mask;
523
524 if (!overrun && !(status & port->uart.ignore_status_mask)) {
525 int flag;
526
527 if (status & (1 << TTY_BREAK))
528 flag = TTY_BREAK;
529 else if (status & (1 << TTY_PARITY))
530 flag = TTY_PARITY;
531 else if (status & (1 << TTY_FRAME))
532 flag = TTY_FRAME;
533 else
534 flag = TTY_NORMAL;
535
536 tty_insert_flip_char(tty, ch, flag);
537 }
538
539 /* overrun is special, since it's reported immediately, and doesn't
540 * affect the current character
541 */
542 if (overrun)
543 tty_insert_flip_char(tty, 0, TTY_OVERRUN);
544
545 count--;
546 if (count <= 0) {
547 if (!tty->low_latency)
548 tty_flip_buffer_push(tty);
549 return;
550 }
551
552ignore_char:
553 push = 1;
554 goto try_again;
555
556not_break:
557 port->rx_brk = 0;
558 goto process_errors;
559}
560
561/*
562 * handle an interrupt from the serial transmission "virtual DMA" driver
563 * - note: the interrupt routine will disable its own interrupts when the Tx
564 * buffer is empty
565 */
566static void mn10300_serial_transmit_interrupt(struct mn10300_serial_port *port)
567{
568 _enter("%s", port->name);
569
570 if (uart_tx_stopped(&port->uart) ||
571 uart_circ_empty(&port->uart.info->xmit))
572 mn10300_serial_dis_tx_intr(port);
573
574 if (uart_circ_chars_pending(&port->uart.info->xmit) < WAKEUP_CHARS)
575 uart_write_wakeup(&port->uart);
576}
577
578/*
579 * deal with a change in the status of the CTS line
580 */
581static void mn10300_serial_cts_changed(struct mn10300_serial_port *port, u8 st)
582{
583 u16 ctr;
584
585 port->tx_cts = st;
586 port->uart.icount.cts++;
587
588 /* flip the CTS state selector flag to interrupt when it changes
589 * back */
590 ctr = *port->_control;
591 ctr ^= SC2CTR_TWS;
592 *port->_control = ctr;
593
594 uart_handle_cts_change(&port->uart, st & SC2STR_CTS);
595 wake_up_interruptible(&port->uart.info->delta_msr_wait);
596}
597
598/*
599 * handle a virtual interrupt generated by the lower level "virtual DMA"
600 * routines (irq is the baud timer interrupt)
601 */
602static irqreturn_t mn10300_serial_interrupt(int irq, void *dev_id)
603{
604 struct mn10300_serial_port *port = dev_id;
605 u8 st;
606
607 spin_lock(&port->uart.lock);
608
609 if (port->intr_flags) {
610 _debug("INT %s: %x", port->name, port->intr_flags);
611
612 if (mask_test_and_clear(&port->intr_flags, MNSCx_RX_AVAIL))
613 mn10300_serial_receive_interrupt(port);
614
615 if (mask_test_and_clear(&port->intr_flags,
616 MNSCx_TX_SPACE | MNSCx_TX_EMPTY))
617 mn10300_serial_transmit_interrupt(port);
618 }
619
620 /* the only modem control line amongst the whole lot is CTS on
621 * serial port 2 */
622 if (port->type == PORT_MN10300_CTS) {
623 st = *port->_status;
624 if ((port->tx_cts ^ st) & SC2STR_CTS)
625 mn10300_serial_cts_changed(port, st);
626 }
627
628 spin_unlock(&port->uart.lock);
629
630 return IRQ_HANDLED;
631}
632
633/*
634 * return indication of whether the hardware transmit buffer is empty
635 */
636static unsigned int mn10300_serial_tx_empty(struct uart_port *_port)
637{
638 struct mn10300_serial_port *port =
639 container_of(_port, struct mn10300_serial_port, uart);
640
641 _enter("%s", port->name);
642
643 return (*port->_status & (SC01STR_TXF | SC01STR_TBF)) ?
644 0 : TIOCSER_TEMT;
645}
646
647/*
648 * set the modem control lines (we don't have any)
649 */
650static void mn10300_serial_set_mctrl(struct uart_port *_port,
651 unsigned int mctrl)
652{
653 struct mn10300_serial_port *port =
654 container_of(_port, struct mn10300_serial_port, uart);
655
656 _enter("%s,%x", port->name, mctrl);
657}
658
659/*
660 * get the modem control line statuses
661 */
662static unsigned int mn10300_serial_get_mctrl(struct uart_port *_port)
663{
664 struct mn10300_serial_port *port =
665 container_of(_port, struct mn10300_serial_port, uart);
666
667 _enter("%s", port->name);
668
669 if (port->type == PORT_MN10300_CTS && !(*port->_status & SC2STR_CTS))
670 return TIOCM_CAR | TIOCM_DSR;
671
672 return TIOCM_CAR | TIOCM_CTS | TIOCM_DSR;
673}
674
675/*
676 * stop transmitting characters
677 */
678static void mn10300_serial_stop_tx(struct uart_port *_port)
679{
680 struct mn10300_serial_port *port =
681 container_of(_port, struct mn10300_serial_port, uart);
682
683 _enter("%s", port->name);
684
685 /* disable the virtual DMA */
686 mn10300_serial_dis_tx_intr(port);
687}
688
689/*
690 * start transmitting characters
691 * - jump-start transmission if it has stalled
692 * - enable the serial Tx interrupt (used by the virtual DMA controller)
693 * - force an interrupt to happen if necessary
694 */
695static void mn10300_serial_start_tx(struct uart_port *_port)
696{
697 struct mn10300_serial_port *port =
698 container_of(_port, struct mn10300_serial_port, uart);
699
700 u16 x;
701
702 _enter("%s{%lu}",
703 port->name,
704 CIRC_CNT(&port->uart.info->xmit.head,
705 &port->uart.info->xmit.tail,
706 UART_XMIT_SIZE));
707
708 /* kick the virtual DMA controller */
709 x = *port->tx_icr;
710 x |= GxICR_ENABLE;
711
712 if (*port->_status & SC01STR_TBF)
713 x &= ~(GxICR_REQUEST | GxICR_DETECT);
714 else
715 x |= GxICR_REQUEST | GxICR_DETECT;
716
717 _debug("CTR=%04hx ICR=%02hx STR=%04x TMD=%02hx TBR=%04hx ICR=%04hx",
718 *port->_control, *port->_intr, *port->_status,
719 *port->_tmxmd, *port->_tmxbr, *port->tx_icr);
720
721 *port->tx_icr = x;
722 x = *port->tx_icr;
723}
724
725/*
726 * transmit a high-priority XON/XOFF character
727 */
728static void mn10300_serial_send_xchar(struct uart_port *_port, char ch)
729{
730 struct mn10300_serial_port *port =
731 container_of(_port, struct mn10300_serial_port, uart);
732
733 _enter("%s,%02x", port->name, ch);
734
735 if (likely(port->gdbstub)) {
736 port->tx_xchar = ch;
737 if (ch)
738 mn10300_serial_en_tx_intr(port);
739 }
740}
741
742/*
743 * stop receiving characters
744 * - called whilst the port is being closed
745 */
746static void mn10300_serial_stop_rx(struct uart_port *_port)
747{
748 struct mn10300_serial_port *port =
749 container_of(_port, struct mn10300_serial_port, uart);
750
751 u16 ctr;
752
753 _enter("%s", port->name);
754
755 ctr = *port->_control;
756 ctr &= ~SC01CTR_RXE;
757 *port->_control = ctr;
758
759 mn10300_serial_dis_rx_intr(port);
760}
761
762/*
763 * enable modem status interrupts
764 */
765static void mn10300_serial_enable_ms(struct uart_port *_port)
766{
767 struct mn10300_serial_port *port =
768 container_of(_port, struct mn10300_serial_port, uart);
769
770 u16 ctr, cts;
771
772 _enter("%s", port->name);
773
774 if (port->type == PORT_MN10300_CTS) {
775 /* want to interrupt when CTS goes low if CTS is now high and
776 * vice versa
777 */
778 port->tx_cts = *port->_status;
779
780 cts = (port->tx_cts & SC2STR_CTS) ?
781 SC2CTR_TWE : SC2CTR_TWE | SC2CTR_TWS;
782
783 ctr = *port->_control;
784 ctr &= ~SC2CTR_TWS;
785 ctr |= cts;
786 *port->_control = ctr;
787
788 mn10300_serial_en_tx_intr(port);
789 }
790}
791
792/*
793 * transmit or cease transmitting a break signal
794 */
795static void mn10300_serial_break_ctl(struct uart_port *_port, int ctl)
796{
797 struct mn10300_serial_port *port =
798 container_of(_port, struct mn10300_serial_port, uart);
799
800 _enter("%s,%d", port->name, ctl);
801
802 if (ctl) {
803 /* tell the virtual DMA handler to assert BREAK */
804 port->tx_break = 1;
805 mn10300_serial_en_tx_intr(port);
806 } else {
807 port->tx_break = 0;
808 *port->_control &= ~SC01CTR_BKE;
809 mn10300_serial_en_tx_intr(port);
810 }
811}
812
813/*
814 * grab the interrupts and enable the port for reception
815 */
816static int mn10300_serial_startup(struct uart_port *_port)
817{
818 struct mn10300_serial_port *port =
819 container_of(_port, struct mn10300_serial_port, uart);
820 struct mn10300_serial_int *pint;
821
822 _enter("%s{%d}", port->name, port->gdbstub);
823
824 if (unlikely(port->gdbstub))
825 return -EBUSY;
826
827 /* allocate an Rx buffer for the virtual DMA handler */
828 port->rx_buffer = kmalloc(MNSC_BUFFER_SIZE, GFP_KERNEL);
829 if (!port->rx_buffer)
830 return -ENOMEM;
831
832 port->rx_inp = port->rx_outp = 0;
833
834 /* finally, enable the device */
835 *port->_intr = SC01ICR_TI;
836 *port->_control |= SC01CTR_TXE | SC01CTR_RXE;
837
838 pint = &mn10300_serial_int_tbl[port->rx_irq];
839 pint->port = port;
840 pint->vdma = mn10300_serial_vdma_rx_handler;
841 pint = &mn10300_serial_int_tbl[port->tx_irq];
842 pint->port = port;
843 pint->vdma = mn10300_serial_vdma_tx_handler;
844
845 set_intr_level(port->rx_irq, GxICR_LEVEL_1);
846 set_intr_level(port->tx_irq, GxICR_LEVEL_1);
847 set_irq_chip(port->tm_irq, &mn10300_serial_pic);
848
849 if (request_irq(port->rx_irq, mn10300_serial_interrupt,
850 IRQF_DISABLED, port->rx_name, port) < 0)
851 goto error;
852
853 if (request_irq(port->tx_irq, mn10300_serial_interrupt,
854 IRQF_DISABLED, port->tx_name, port) < 0)
855 goto error2;
856
857 if (request_irq(port->tm_irq, mn10300_serial_interrupt,
858 IRQF_DISABLED, port->tm_name, port) < 0)
859 goto error3;
860 mn10300_serial_mask_ack(port->tm_irq);
861
862 return 0;
863
864error3:
865 free_irq(port->tx_irq, port);
866error2:
867 free_irq(port->rx_irq, port);
868error:
869 kfree(port->rx_buffer);
870 port->rx_buffer = NULL;
871 return -EBUSY;
872}
873
874/*
875 * shutdown the port and release interrupts
876 */
877static void mn10300_serial_shutdown(struct uart_port *_port)
878{
879 struct mn10300_serial_port *port =
880 container_of(_port, struct mn10300_serial_port, uart);
881
882 _enter("%s", port->name);
883
884 /* disable the serial port and its baud rate timer */
885 port->tx_break = 0;
886 *port->_control &= ~(SC01CTR_TXE | SC01CTR_RXE | SC01CTR_BKE);
887 *port->_tmxmd = 0;
888
889 if (port->rx_buffer) {
890 void *buf = port->rx_buffer;
891 port->rx_buffer = NULL;
892 kfree(buf);
893 }
894
895 /* disable all intrs */
896 free_irq(port->tm_irq, port);
897 free_irq(port->rx_irq, port);
898 free_irq(port->tx_irq, port);
899
900 *port->rx_icr = GxICR_LEVEL_1;
901 *port->tx_icr = GxICR_LEVEL_1;
902}
903
904/*
905 * this routine is called to set the UART divisor registers to match the
906 * specified baud rate for a serial port.
907 */
908static void mn10300_serial_change_speed(struct mn10300_serial_port *port,
909 struct ktermios *new,
910 struct ktermios *old)
911{
912 unsigned long flags;
913 unsigned long ioclk = port->ioclk;
914 unsigned cflag;
915 int baud, bits, xdiv, tmp;
916 u16 tmxbr, scxctr;
917 u8 tmxmd, battempt;
918 u8 div_timer = port->div_timer;
919
920 _enter("%s{%lu}", port->name, ioclk);
921
922 /* byte size and parity */
923 cflag = new->c_cflag;
924 switch (cflag & CSIZE) {
925 case CS7: scxctr = SC01CTR_CLN_7BIT; bits = 9; break;
926 case CS8: scxctr = SC01CTR_CLN_8BIT; bits = 10; break;
927 default: scxctr = SC01CTR_CLN_8BIT; bits = 10; break;
928 }
929
930 if (cflag & CSTOPB) {
931 scxctr |= SC01CTR_STB_2BIT;
932 bits++;
933 }
934
935 if (cflag & PARENB) {
936 bits++;
937 if (cflag & PARODD)
938 scxctr |= SC01CTR_PB_ODD;
939#ifdef CMSPAR
940 else if (cflag & CMSPAR)
941 scxctr |= SC01CTR_PB_FIXED0;
942#endif
943 else
944 scxctr |= SC01CTR_PB_EVEN;
945 }
946
947 /* Determine divisor based on baud rate */
948 battempt = 0;
949
950 if (div_timer == MNSCx_DIV_TIMER_16BIT)
951 scxctr |= SC0CTR_CK_TM8UFLOW_8; /* ( == SC1CTR_CK_TM9UFLOW_8
952 * == SC2CTR_CK_TM10UFLOW) */
953 else if (div_timer == MNSCx_DIV_TIMER_8BIT)
954 scxctr |= SC0CTR_CK_TM2UFLOW_8;
955
956try_alternative:
957 baud = uart_get_baud_rate(&port->uart, new, old, 0,
958 port->ioclk / 8);
959
960 _debug("ALT %d [baud %d]", battempt, baud);
961
962 if (!baud)
963 baud = 9600; /* B0 transition handled in rs_set_termios */
964 xdiv = 1;
965 if (baud == 134) {
966 baud = 269; /* 134 is really 134.5 */
967 xdiv = 2;
968 }
969
970 if (baud == 38400 &&
971 (port->uart.flags & UPF_SPD_MASK) == UPF_SPD_CUST
972 ) {
973 _debug("CUSTOM %u", port->uart.custom_divisor);
974
975 if (div_timer == MNSCx_DIV_TIMER_16BIT) {
976 if (port->uart.custom_divisor <= 65535) {
977 tmxmd = TM8MD_SRC_IOCLK;
978 tmxbr = port->uart.custom_divisor;
979 port->uart.uartclk = ioclk;
980 goto timer_okay;
981 }
982 if (port->uart.custom_divisor / 8 <= 65535) {
983 tmxmd = TM8MD_SRC_IOCLK_8;
984 tmxbr = port->uart.custom_divisor / 8;
985 port->uart.custom_divisor = tmxbr * 8;
986 port->uart.uartclk = ioclk / 8;
987 goto timer_okay;
988 }
989 if (port->uart.custom_divisor / 32 <= 65535) {
990 tmxmd = TM8MD_SRC_IOCLK_32;
991 tmxbr = port->uart.custom_divisor / 32;
992 port->uart.custom_divisor = tmxbr * 32;
993 port->uart.uartclk = ioclk / 32;
994 goto timer_okay;
995 }
996
997 } else if (div_timer == MNSCx_DIV_TIMER_8BIT) {
998 if (port->uart.custom_divisor <= 255) {
999 tmxmd = TM2MD_SRC_IOCLK;
1000 tmxbr = port->uart.custom_divisor;
1001 port->uart.uartclk = ioclk;
1002 goto timer_okay;
1003 }
1004 if (port->uart.custom_divisor / 8 <= 255) {
1005 tmxmd = TM2MD_SRC_IOCLK_8;
1006 tmxbr = port->uart.custom_divisor / 8;
1007 port->uart.custom_divisor = tmxbr * 8;
1008 port->uart.uartclk = ioclk / 8;
1009 goto timer_okay;
1010 }
1011 if (port->uart.custom_divisor / 32 <= 255) {
1012 tmxmd = TM2MD_SRC_IOCLK_32;
1013 tmxbr = port->uart.custom_divisor / 32;
1014 port->uart.custom_divisor = tmxbr * 32;
1015 port->uart.uartclk = ioclk / 32;
1016 goto timer_okay;
1017 }
1018 }
1019 }
1020
1021 switch (div_timer) {
1022 case MNSCx_DIV_TIMER_16BIT:
1023 port->uart.uartclk = ioclk;
1024 tmxmd = TM8MD_SRC_IOCLK;
1025 tmxbr = tmp = (ioclk / (baud * xdiv) + 4) / 8 - 1;
1026 if (tmp > 0 && tmp <= 65535)
1027 goto timer_okay;
1028
1029 port->uart.uartclk = ioclk / 8;
1030 tmxmd = TM8MD_SRC_IOCLK_8;
1031 tmxbr = tmp = (ioclk / (baud * 8 * xdiv) + 4) / 8 - 1;
1032 if (tmp > 0 && tmp <= 65535)
1033 goto timer_okay;
1034
1035 port->uart.uartclk = ioclk / 32;
1036 tmxmd = TM8MD_SRC_IOCLK_32;
1037 tmxbr = tmp = (ioclk / (baud * 32 * xdiv) + 4) / 8 - 1;
1038 if (tmp > 0 && tmp <= 65535)
1039 goto timer_okay;
1040 break;
1041
1042 case MNSCx_DIV_TIMER_8BIT:
1043 port->uart.uartclk = ioclk;
1044 tmxmd = TM2MD_SRC_IOCLK;
1045 tmxbr = tmp = (ioclk / (baud * xdiv) + 4) / 8 - 1;
1046 if (tmp > 0 && tmp <= 255)
1047 goto timer_okay;
1048
1049 port->uart.uartclk = ioclk / 8;
1050 tmxmd = TM2MD_SRC_IOCLK_8;
1051 tmxbr = tmp = (ioclk / (baud * 8 * xdiv) + 4) / 8 - 1;
1052 if (tmp > 0 && tmp <= 255)
1053 goto timer_okay;
1054
1055 port->uart.uartclk = ioclk / 32;
1056 tmxmd = TM2MD_SRC_IOCLK_32;
1057 tmxbr = tmp = (ioclk / (baud * 32 * xdiv) + 4) / 8 - 1;
1058 if (tmp > 0 && tmp <= 255)
1059 goto timer_okay;
1060 break;
1061
1062 default:
1063 BUG();
1064 return;
1065 }
1066
1067 /* refuse to change to a baud rate we can't support */
1068 _debug("CAN'T SUPPORT");
1069
1070 switch (battempt) {
1071 case 0:
1072 if (old) {
1073 new->c_cflag &= ~CBAUD;
1074 new->c_cflag |= (old->c_cflag & CBAUD);
1075 battempt = 1;
1076 goto try_alternative;
1077 }
1078
1079 case 1:
1080 /* as a last resort, if the quotient is zero, default to 9600
1081 * bps */
1082 new->c_cflag &= ~CBAUD;
1083 new->c_cflag |= B9600;
1084 battempt = 2;
1085 goto try_alternative;
1086
1087 default:
1088 /* hmmm... can't seem to support 9600 either
1089 * - we could try iterating through the speeds we know about to
1090 * find the lowest
1091 */
1092 new->c_cflag &= ~CBAUD;
1093 new->c_cflag |= B0;
1094
1095 if (div_timer == MNSCx_DIV_TIMER_16BIT)
1096 tmxmd = TM8MD_SRC_IOCLK_32;
1097 else if (div_timer == MNSCx_DIV_TIMER_8BIT)
1098 tmxmd = TM2MD_SRC_IOCLK_32;
1099 tmxbr = 1;
1100
1101 port->uart.uartclk = ioclk / 32;
1102 break;
1103 }
1104timer_okay:
1105
1106 _debug("UARTCLK: %u / %hu", port->uart.uartclk, tmxbr);
1107
1108 /* make the changes */
1109 spin_lock_irqsave(&port->uart.lock, flags);
1110
1111 uart_update_timeout(&port->uart, new->c_cflag, baud);
1112
1113 /* set the timer to produce the required baud rate */
1114 switch (div_timer) {
1115 case MNSCx_DIV_TIMER_16BIT:
1116 *port->_tmxmd = 0;
1117 *port->_tmxbr = tmxbr;
1118 *port->_tmxmd = TM8MD_INIT_COUNTER;
1119 *port->_tmxmd = tmxmd | TM8MD_COUNT_ENABLE;
1120 break;
1121
1122 case MNSCx_DIV_TIMER_8BIT:
1123 *port->_tmxmd = 0;
1124 *(volatile u8 *) port->_tmxbr = (u8) tmxbr;
1125 *port->_tmxmd = TM2MD_INIT_COUNTER;
1126 *port->_tmxmd = tmxmd | TM2MD_COUNT_ENABLE;
1127 break;
1128 }
1129
1130 /* CTS flow control flag and modem status interrupts */
1131 scxctr &= ~(SC2CTR_TWE | SC2CTR_TWS);
1132
1133 if (port->type == PORT_MN10300_CTS && cflag & CRTSCTS) {
1134 /* want to interrupt when CTS goes low if CTS is now
1135 * high and vice versa
1136 */
1137 port->tx_cts = *port->_status;
1138
1139 if (port->tx_cts & SC2STR_CTS)
1140 scxctr |= SC2CTR_TWE;
1141 else
1142 scxctr |= SC2CTR_TWE | SC2CTR_TWS;
1143 }
1144
1145 /* set up parity check flag */
1146 port->uart.read_status_mask = (1 << TTY_NORMAL) | (1 << TTY_OVERRUN);
1147 if (new->c_iflag & INPCK)
1148 port->uart.read_status_mask |=
1149 (1 << TTY_PARITY) | (1 << TTY_FRAME);
1150 if (new->c_iflag & (BRKINT | PARMRK))
1151 port->uart.read_status_mask |= (1 << TTY_BREAK);
1152
1153 /* characters to ignore */
1154 port->uart.ignore_status_mask = 0;
1155 if (new->c_iflag & IGNPAR)
1156 port->uart.ignore_status_mask |=
1157 (1 << TTY_PARITY) | (1 << TTY_FRAME);
1158 if (new->c_iflag & IGNBRK) {
1159 port->uart.ignore_status_mask |= (1 << TTY_BREAK);
1160 /*
1161 * If we're ignoring parity and break indicators,
1162 * ignore overruns to (for real raw support).
1163 */
1164 if (new->c_iflag & IGNPAR)
1165 port->uart.ignore_status_mask |= (1 << TTY_OVERRUN);
1166 }
1167
1168 /* Ignore all characters if CREAD is not set */
1169 if ((new->c_cflag & CREAD) == 0)
1170 port->uart.ignore_status_mask |= (1 << TTY_NORMAL);
1171
1172 scxctr |= *port->_control & (SC01CTR_TXE | SC01CTR_RXE | SC01CTR_BKE);
1173 *port->_control = scxctr;
1174
1175 spin_unlock_irqrestore(&port->uart.lock, flags);
1176}
1177
1178/*
1179 * set the terminal I/O parameters
1180 */
1181static void mn10300_serial_set_termios(struct uart_port *_port,
1182 struct ktermios *new,
1183 struct ktermios *old)
1184{
1185 struct mn10300_serial_port *port =
1186 container_of(_port, struct mn10300_serial_port, uart);
1187
1188 _enter("%s,%p,%p", port->name, new, old);
1189
1190 mn10300_serial_change_speed(port, new, old);
1191
1192 /* handle turning off CRTSCTS */
1193 if (!(new->c_cflag & CRTSCTS)) {
1194 u16 ctr = *port->_control;
1195 ctr &= ~SC2CTR_TWE;
1196 *port->_control = ctr;
1197 }
1198}
1199
1200/*
1201 * return description of port type
1202 */
1203static const char *mn10300_serial_type(struct uart_port *_port)
1204{
1205 struct mn10300_serial_port *port =
1206 container_of(_port, struct mn10300_serial_port, uart);
1207
1208 if (port->uart.type == PORT_MN10300_CTS)
1209 return "MN10300 SIF_CTS";
1210
1211 return "MN10300 SIF";
1212}
1213
1214/*
1215 * release I/O and memory regions in use by port
1216 */
1217static void mn10300_serial_release_port(struct uart_port *_port)
1218{
1219 struct mn10300_serial_port *port =
1220 container_of(_port, struct mn10300_serial_port, uart);
1221
1222 _enter("%s", port->name);
1223
1224 release_mem_region((unsigned long) port->_iobase, 16);
1225}
1226
1227/*
1228 * request I/O and memory regions for port
1229 */
1230static int mn10300_serial_request_port(struct uart_port *_port)
1231{
1232 struct mn10300_serial_port *port =
1233 container_of(_port, struct mn10300_serial_port, uart);
1234
1235 _enter("%s", port->name);
1236
1237 request_mem_region((unsigned long) port->_iobase, 16, port->name);
1238 return 0;
1239}
1240
1241/*
1242 * configure the type and reserve the ports
1243 */
1244static void mn10300_serial_config_port(struct uart_port *_port, int type)
1245{
1246 struct mn10300_serial_port *port =
1247 container_of(_port, struct mn10300_serial_port, uart);
1248
1249 _enter("%s", port->name);
1250
1251 port->uart.type = PORT_MN10300;
1252
1253 if (port->options & MNSCx_OPT_CTS)
1254 port->uart.type = PORT_MN10300_CTS;
1255
1256 mn10300_serial_request_port(_port);
1257}
1258
1259/*
1260 * verify serial parameters are suitable for this port type
1261 */
1262static int mn10300_serial_verify_port(struct uart_port *_port,
1263 struct serial_struct *ss)
1264{
1265 struct mn10300_serial_port *port =
1266 container_of(_port, struct mn10300_serial_port, uart);
1267 void *mapbase = (void *) (unsigned long) port->uart.mapbase;
1268
1269 _enter("%s", port->name);
1270
1271 /* these things may not be changed */
1272 if (ss->irq != port->uart.irq ||
1273 ss->port != port->uart.iobase ||
1274 ss->io_type != port->uart.iotype ||
1275 ss->iomem_base != mapbase ||
1276 ss->iomem_reg_shift != port->uart.regshift ||
1277 ss->hub6 != port->uart.hub6 ||
1278 ss->xmit_fifo_size != port->uart.fifosize)
1279 return -EINVAL;
1280
1281 /* type may be changed on a port that supports CTS */
1282 if (ss->type != port->uart.type) {
1283 if (!(port->options & MNSCx_OPT_CTS))
1284 return -EINVAL;
1285
1286 if (ss->type != PORT_MN10300 &&
1287 ss->type != PORT_MN10300_CTS)
1288 return -EINVAL;
1289 }
1290
1291 return 0;
1292}
1293
1294/*
1295 * initialise the MN10300 on-chip UARTs
1296 */
1297static int __init mn10300_serial_init(void)
1298{
1299 struct mn10300_serial_port *port;
1300 int ret, i;
1301
1302 printk(KERN_INFO "%s version %s (%s)\n",
1303 serial_name, serial_version, serial_revdate);
1304
1305#ifdef CONFIG_MN10300_TTYSM2
1306 SC2TIM = 8; /* make the baud base of timer 2 IOCLK/8 */
1307#endif
1308
1309 set_intr_stub(EXCEP_IRQ_LEVEL1, mn10300_serial_vdma_interrupt);
1310
1311 ret = uart_register_driver(&mn10300_serial_driver);
1312 if (!ret) {
1313 for (i = 0 ; i < NR_PORTS ; i++) {
1314 port = mn10300_serial_ports[i];
1315 if (!port || port->gdbstub)
1316 continue;
1317
1318 switch (port->clock_src) {
1319 case MNSCx_CLOCK_SRC_IOCLK:
1320 port->ioclk = MN10300_IOCLK;
1321 break;
1322
1323#ifdef MN10300_IOBCLK
1324 case MNSCx_CLOCK_SRC_IOBCLK:
1325 port->ioclk = MN10300_IOBCLK;
1326 break;
1327#endif
1328 default:
1329 BUG();
1330 }
1331
1332 ret = uart_add_one_port(&mn10300_serial_driver,
1333 &port->uart);
1334
1335 if (ret < 0) {
1336 _debug("ERROR %d", -ret);
1337 break;
1338 }
1339 }
1340
1341 if (ret)
1342 uart_unregister_driver(&mn10300_serial_driver);
1343 }
1344
1345 return ret;
1346}
1347
1348__initcall(mn10300_serial_init);
1349
1350
1351#ifdef CONFIG_MN10300_TTYSM_CONSOLE
1352
1353/*
1354 * print a string to the serial port without disturbing the real user of the
1355 * port too much
1356 * - the console must be locked by the caller
1357 */
1358static void mn10300_serial_console_write(struct console *co,
1359 const char *s, unsigned count)
1360{
1361 struct mn10300_serial_port *port;
1362 unsigned i;
1363 u16 scxctr, txicr, tmp;
1364 u8 tmxmd;
1365
1366 port = mn10300_serial_ports[co->index];
1367
1368 /* firstly hijack the serial port from the "virtual DMA" controller */
1369 txicr = *port->tx_icr;
1370 *port->tx_icr = GxICR_LEVEL_1;
1371 tmp = *port->tx_icr;
1372
1373 /* the transmitter may be disabled */
1374 scxctr = *port->_control;
1375 if (!(scxctr & SC01CTR_TXE)) {
1376 /* restart the UART clock */
1377 tmxmd = *port->_tmxmd;
1378
1379 switch (port->div_timer) {
1380 case MNSCx_DIV_TIMER_16BIT:
1381 *port->_tmxmd = 0;
1382 *port->_tmxmd = TM8MD_INIT_COUNTER;
1383 *port->_tmxmd = tmxmd | TM8MD_COUNT_ENABLE;
1384 break;
1385
1386 case MNSCx_DIV_TIMER_8BIT:
1387 *port->_tmxmd = 0;
1388 *port->_tmxmd = TM2MD_INIT_COUNTER;
1389 *port->_tmxmd = tmxmd | TM2MD_COUNT_ENABLE;
1390 break;
1391 }
1392
1393 /* enable the transmitter */
1394 *port->_control = (scxctr & ~SC01CTR_BKE) | SC01CTR_TXE;
1395
1396 } else if (scxctr & SC01CTR_BKE) {
1397 /* stop transmitting BREAK */
1398 *port->_control = (scxctr & ~SC01CTR_BKE);
1399 }
1400
1401 /* send the chars into the serial port (with LF -> LFCR conversion) */
1402 for (i = 0; i < count; i++) {
1403 char ch = *s++;
1404
1405 while (*port->_status & SC01STR_TBF)
1406 continue;
1407 *(u8 *) port->_txb = ch;
1408
1409 if (ch == 0x0a) {
1410 while (*port->_status & SC01STR_TBF)
1411 continue;
1412 *(u8 *) port->_txb = 0xd;
1413 }
1414 }
1415
1416 /* can't let the transmitter be turned off if it's actually
1417 * transmitting */
1418 while (*port->_status & (SC01STR_TXF | SC01STR_TBF))
1419 continue;
1420
1421 /* disable the transmitter if we re-enabled it */
1422 if (!(scxctr & SC01CTR_TXE))
1423 *port->_control = scxctr;
1424
1425 *port->tx_icr = txicr;
1426 tmp = *port->tx_icr;
1427}
1428
1429/*
1430 * set up a serial port as a console
1431 * - construct a cflag setting for the first rs_open()
1432 * - initialize the serial port
1433 * - return non-zero if we didn't find a serial port.
1434 */
1435static int __init mn10300_serial_console_setup(struct console *co,
1436 char *options)
1437{
1438 struct mn10300_serial_port *port;
1439 int i, parity = 'n', baud = 9600, bits = 8, flow = 0;
1440
1441 for (i = 0 ; i < NR_PORTS ; i++) {
1442 port = mn10300_serial_ports[i];
1443 if (port && !port->gdbstub && port->uart.line == co->index)
1444 goto found_device;
1445 }
1446
1447 return -ENODEV;
1448
1449found_device:
1450 switch (port->clock_src) {
1451 case MNSCx_CLOCK_SRC_IOCLK:
1452 port->ioclk = MN10300_IOCLK;
1453 break;
1454
1455#ifdef MN10300_IOBCLK
1456 case MNSCx_CLOCK_SRC_IOBCLK:
1457 port->ioclk = MN10300_IOBCLK;
1458 break;
1459#endif
1460 default:
1461 BUG();
1462 }
1463
1464 if (options)
1465 uart_parse_options(options, &baud, &parity, &bits, &flow);
1466
1467 return uart_set_options(&port->uart, co, baud, parity, bits, flow);
1468}
1469
1470/*
1471 * register console
1472 */
1473static int __init mn10300_serial_console_init(void)
1474{
1475 register_console(&mn10300_serial_console);
1476 return 0;
1477}
1478
1479console_initcall(mn10300_serial_console_init);
1480#endif
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-28 02:22:48 -0500