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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/cooloney...
[wrt350n-kernel.git] / drivers / serial / sunzilog.c
blobcb2e405063794f97922aaa6f5eaf9e0d77a15302
1 /* sunzilog.c: Zilog serial driver for Sparc systems.
2 *
3 * Driver for Zilog serial chips found on Sun workstations and
4 * servers. This driver could actually be made more generic.
5 *
6 * This is based on the old drivers/sbus/char/zs.c code. A lot
7 * of code has been simply moved over directly from there but
8 * much has been rewritten. Credits therefore go out to Eddie
9 * C. Dost, Pete Zaitcev, Ted Ts'o and Alex Buell for their
10 * work there.
11 *
12 * Copyright (C) 2002, 2006, 2007 David S. Miller (davem@davemloft.net)
13 */
14
15 #include <linux/module.h>
16 #include <linux/kernel.h>
17 #include <linux/errno.h>
18 #include <linux/delay.h>
19 #include <linux/tty.h>
20 #include <linux/tty_flip.h>
21 #include <linux/major.h>
22 #include <linux/string.h>
23 #include <linux/ptrace.h>
24 #include <linux/ioport.h>
25 #include <linux/slab.h>
26 #include <linux/circ_buf.h>
27 #include <linux/serial.h>
28 #include <linux/sysrq.h>
29 #include <linux/console.h>
30 #include <linux/spinlock.h>
31 #ifdef CONFIG_SERIO
32 #include <linux/serio.h>
33 #endif
34 #include <linux/init.h>
35
36 #include <asm/io.h>
37 #include <asm/irq.h>
38 #include <asm/prom.h>
39 #include <asm/of_device.h>
40
41 #if defined(CONFIG_SERIAL_SUNZILOG_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
42 #define SUPPORT_SYSRQ
43 #endif
44
45 #include <linux/serial_core.h>
46
47 #include "suncore.h"
48 #include "sunzilog.h"
49
50 /* On 32-bit sparcs we need to delay after register accesses
51 * to accommodate sun4 systems, but we do not need to flush writes.
52 * On 64-bit sparc we only need to flush single writes to ensure
53 * completion.
54 */
55 #ifndef CONFIG_SPARC64
56 #define ZSDELAY() udelay(5)
57 #define ZSDELAY_LONG() udelay(20)
58 #define ZS_WSYNC(channel) do { } while (0)
59 #else
60 #define ZSDELAY()
61 #define ZSDELAY_LONG()
62 #define ZS_WSYNC(__channel) \
63 readb(&((__channel)->control))
64 #endif
65
66 #define ZS_CLOCK 4915200 /* Zilog input clock rate. */
67 #define ZS_CLOCK_DIVISOR 16 /* Divisor this driver uses. */
68
69 /*
70 * We wrap our port structure around the generic uart_port.
71 */
72 struct uart_sunzilog_port {
73 struct uart_port port;
74
75 /* IRQ servicing chain. */
76 struct uart_sunzilog_port *next;
77
78 /* Current values of Zilog write registers. */
79 unsigned char curregs[NUM_ZSREGS];
80
81 unsigned int flags;
82 #define SUNZILOG_FLAG_CONS_KEYB 0x00000001
83 #define SUNZILOG_FLAG_CONS_MOUSE 0x00000002
84 #define SUNZILOG_FLAG_IS_CONS 0x00000004
85 #define SUNZILOG_FLAG_IS_KGDB 0x00000008
86 #define SUNZILOG_FLAG_MODEM_STATUS 0x00000010
87 #define SUNZILOG_FLAG_IS_CHANNEL_A 0x00000020
88 #define SUNZILOG_FLAG_REGS_HELD 0x00000040
89 #define SUNZILOG_FLAG_TX_STOPPED 0x00000080
90 #define SUNZILOG_FLAG_TX_ACTIVE 0x00000100
91 #define SUNZILOG_FLAG_ESCC 0x00000200
92 #define SUNZILOG_FLAG_ISR_HANDLER 0x00000400
93
94 unsigned int cflag;
95
96 unsigned char parity_mask;
97 unsigned char prev_status;
98
99 #ifdef CONFIG_SERIO
100 struct serio serio;
101 int serio_open;
102 #endif
103 };
104
105 #define ZILOG_CHANNEL_FROM_PORT(PORT) ((struct zilog_channel __iomem *)((PORT)->membase))
106 #define UART_ZILOG(PORT) ((struct uart_sunzilog_port *)(PORT))
107
108 #define ZS_IS_KEYB(UP) ((UP)->flags & SUNZILOG_FLAG_CONS_KEYB)
109 #define ZS_IS_MOUSE(UP) ((UP)->flags & SUNZILOG_FLAG_CONS_MOUSE)
110 #define ZS_IS_CONS(UP) ((UP)->flags & SUNZILOG_FLAG_IS_CONS)
111 #define ZS_IS_KGDB(UP) ((UP)->flags & SUNZILOG_FLAG_IS_KGDB)
112 #define ZS_WANTS_MODEM_STATUS(UP) ((UP)->flags & SUNZILOG_FLAG_MODEM_STATUS)
113 #define ZS_IS_CHANNEL_A(UP) ((UP)->flags & SUNZILOG_FLAG_IS_CHANNEL_A)
114 #define ZS_REGS_HELD(UP) ((UP)->flags & SUNZILOG_FLAG_REGS_HELD)
115 #define ZS_TX_STOPPED(UP) ((UP)->flags & SUNZILOG_FLAG_TX_STOPPED)
116 #define ZS_TX_ACTIVE(UP) ((UP)->flags & SUNZILOG_FLAG_TX_ACTIVE)
117
118 /* Reading and writing Zilog8530 registers. The delays are to make this
119 * driver work on the Sun4 which needs a settling delay after each chip
120 * register access, other machines handle this in hardware via auxiliary
121 * flip-flops which implement the settle time we do in software.
122 *
123 * The port lock must be held and local IRQs must be disabled
124 * when {read,write}_zsreg is invoked.
125 */
126 static unsigned char read_zsreg(struct zilog_channel __iomem *channel,
127 unsigned char reg)
128 {
129 unsigned char retval;
130
131 writeb(reg, &channel->control);
132 ZSDELAY();
133 retval = readb(&channel->control);
134 ZSDELAY();
135
136 return retval;
137 }
138
139 static void write_zsreg(struct zilog_channel __iomem *channel,
140 unsigned char reg, unsigned char value)
141 {
142 writeb(reg, &channel->control);
143 ZSDELAY();
144 writeb(value, &channel->control);
145 ZSDELAY();
146 }
147
148 static void sunzilog_clear_fifo(struct zilog_channel __iomem *channel)
149 {
150 int i;
151
152 for (i = 0; i < 32; i++) {
153 unsigned char regval;
154
155 regval = readb(&channel->control);
156 ZSDELAY();
157 if (regval & Rx_CH_AV)
158 break;
159
160 regval = read_zsreg(channel, R1);
161 readb(&channel->data);
162 ZSDELAY();
163
164 if (regval & (PAR_ERR | Rx_OVR | CRC_ERR)) {
165 writeb(ERR_RES, &channel->control);
166 ZSDELAY();
167 ZS_WSYNC(channel);
168 }
169 }
170 }
171
172 /* This function must only be called when the TX is not busy. The UART
173 * port lock must be held and local interrupts disabled.
174 */
175 static int __load_zsregs(struct zilog_channel __iomem *channel, unsigned char *regs)
176 {
177 int i;
178 int escc;
179 unsigned char r15;
180
181 /* Let pending transmits finish. */
182 for (i = 0; i < 1000; i++) {
183 unsigned char stat = read_zsreg(channel, R1);
184 if (stat & ALL_SNT)
185 break;
186 udelay(100);
187 }
188
189 writeb(ERR_RES, &channel->control);
190 ZSDELAY();
191 ZS_WSYNC(channel);
192
193 sunzilog_clear_fifo(channel);
194
195 /* Disable all interrupts. */
196 write_zsreg(channel, R1,
197 regs[R1] & ~(RxINT_MASK | TxINT_ENAB | EXT_INT_ENAB));
198
199 /* Set parity, sync config, stop bits, and clock divisor. */
200 write_zsreg(channel, R4, regs[R4]);
201
202 /* Set misc. TX/RX control bits. */
203 write_zsreg(channel, R10, regs[R10]);
204
205 /* Set TX/RX controls sans the enable bits. */
206 write_zsreg(channel, R3, regs[R3] & ~RxENAB);
207 write_zsreg(channel, R5, regs[R5] & ~TxENAB);
208
209 /* Synchronous mode config. */
210 write_zsreg(channel, R6, regs[R6]);
211 write_zsreg(channel, R7, regs[R7]);
212
213 /* Don't mess with the interrupt vector (R2, unused by us) and
214 * master interrupt control (R9). We make sure this is setup
215 * properly at probe time then never touch it again.
216 */
217
218 /* Disable baud generator. */
219 write_zsreg(channel, R14, regs[R14] & ~BRENAB);
220
221 /* Clock mode control. */
222 write_zsreg(channel, R11, regs[R11]);
223
224 /* Lower and upper byte of baud rate generator divisor. */
225 write_zsreg(channel, R12, regs[R12]);
226 write_zsreg(channel, R13, regs[R13]);
227
228 /* Now rewrite R14, with BRENAB (if set). */
229 write_zsreg(channel, R14, regs[R14]);
230
231 /* External status interrupt control. */
232 write_zsreg(channel, R15, (regs[R15] | WR7pEN) & ~FIFOEN);
233
234 /* ESCC Extension Register */
235 r15 = read_zsreg(channel, R15);
236 if (r15 & 0x01) {
237 write_zsreg(channel, R7, regs[R7p]);
238
239 /* External status interrupt and FIFO control. */
240 write_zsreg(channel, R15, regs[R15] & ~WR7pEN);
241 escc = 1;
242 } else {
243 /* Clear FIFO bit case it is an issue */
244 regs[R15] &= ~FIFOEN;
245 escc = 0;
246 }
247
248 /* Reset external status interrupts. */
249 write_zsreg(channel, R0, RES_EXT_INT); /* First Latch */
250 write_zsreg(channel, R0, RES_EXT_INT); /* Second Latch */
251
252 /* Rewrite R3/R5, this time without enables masked. */
253 write_zsreg(channel, R3, regs[R3]);
254 write_zsreg(channel, R5, regs[R5]);
255
256 /* Rewrite R1, this time without IRQ enabled masked. */
257 write_zsreg(channel, R1, regs[R1]);
258
259 return escc;
260 }
261
262 /* Reprogram the Zilog channel HW registers with the copies found in the
263 * software state struct. If the transmitter is busy, we defer this update
264 * until the next TX complete interrupt. Else, we do it right now.
265 *
266 * The UART port lock must be held and local interrupts disabled.
267 */
268 static void sunzilog_maybe_update_regs(struct uart_sunzilog_port *up,
269 struct zilog_channel __iomem *channel)
270 {
271 if (!ZS_REGS_HELD(up)) {
272 if (ZS_TX_ACTIVE(up)) {
273 up->flags |= SUNZILOG_FLAG_REGS_HELD;
274 } else {
275 __load_zsregs(channel, up->curregs);
276 }
277 }
278 }
279
280 static void sunzilog_change_mouse_baud(struct uart_sunzilog_port *up)
281 {
282 unsigned int cur_cflag = up->cflag;
283 int brg, new_baud;
284
285 up->cflag &= ~CBAUD;
286 up->cflag |= suncore_mouse_baud_cflag_next(cur_cflag, &new_baud);
287
288 brg = BPS_TO_BRG(new_baud, ZS_CLOCK / ZS_CLOCK_DIVISOR);
289 up->curregs[R12] = (brg & 0xff);
290 up->curregs[R13] = (brg >> 8) & 0xff;
291 sunzilog_maybe_update_regs(up, ZILOG_CHANNEL_FROM_PORT(&up->port));
292 }
293
294 static void sunzilog_kbdms_receive_chars(struct uart_sunzilog_port *up,
295 unsigned char ch, int is_break)
296 {
297 if (ZS_IS_KEYB(up)) {
298 /* Stop-A is handled by drivers/char/keyboard.c now. */
299 #ifdef CONFIG_SERIO
300 if (up->serio_open)
301 serio_interrupt(&up->serio, ch, 0);
302 #endif
303 } else if (ZS_IS_MOUSE(up)) {
304 int ret = suncore_mouse_baud_detection(ch, is_break);
305
306 switch (ret) {
307 case 2:
308 sunzilog_change_mouse_baud(up);
309 /* fallthru */
310 case 1:
311 break;
312
313 case 0:
314 #ifdef CONFIG_SERIO
315 if (up->serio_open)
316 serio_interrupt(&up->serio, ch, 0);
317 #endif
318 break;
319 };
320 }
321 }
322
323 static struct tty_struct *
324 sunzilog_receive_chars(struct uart_sunzilog_port *up,
325 struct zilog_channel __iomem *channel)
326 {
327 struct tty_struct *tty;
328 unsigned char ch, r1, flag;
329
330 tty = NULL;
331 if (up->port.info != NULL && /* Unopened serial console */
332 up->port.info->tty != NULL) /* Keyboard || mouse */
333 tty = up->port.info->tty;
334
335 for (;;) {
336
337 r1 = read_zsreg(channel, R1);
338 if (r1 & (PAR_ERR | Rx_OVR | CRC_ERR)) {
339 writeb(ERR_RES, &channel->control);
340 ZSDELAY();
341 ZS_WSYNC(channel);
342 }
343
344 ch = readb(&channel->control);
345 ZSDELAY();
346
347 /* This funny hack depends upon BRK_ABRT not interfering
348 * with the other bits we care about in R1.
349 */
350 if (ch & BRK_ABRT)
351 r1 |= BRK_ABRT;
352
353 if (!(ch & Rx_CH_AV))
354 break;
355
356 ch = readb(&channel->data);
357 ZSDELAY();
358
359 ch &= up->parity_mask;
360
361 if (unlikely(ZS_IS_KEYB(up)) || unlikely(ZS_IS_MOUSE(up))) {
362 sunzilog_kbdms_receive_chars(up, ch, 0);
363 continue;
364 }
365
366 if (tty == NULL) {
367 uart_handle_sysrq_char(&up->port, ch);
368 continue;
369 }
370
371 /* A real serial line, record the character and status. */
372 flag = TTY_NORMAL;
373 up->port.icount.rx++;
374 if (r1 & (BRK_ABRT | PAR_ERR | Rx_OVR | CRC_ERR)) {
375 if (r1 & BRK_ABRT) {
376 r1 &= ~(PAR_ERR | CRC_ERR);
377 up->port.icount.brk++;
378 if (uart_handle_break(&up->port))
379 continue;
380 }
381 else if (r1 & PAR_ERR)
382 up->port.icount.parity++;
383 else if (r1 & CRC_ERR)
384 up->port.icount.frame++;
385 if (r1 & Rx_OVR)
386 up->port.icount.overrun++;
387 r1 &= up->port.read_status_mask;
388 if (r1 & BRK_ABRT)
389 flag = TTY_BREAK;
390 else if (r1 & PAR_ERR)
391 flag = TTY_PARITY;
392 else if (r1 & CRC_ERR)
393 flag = TTY_FRAME;
394 }
395 if (uart_handle_sysrq_char(&up->port, ch))
396 continue;
397
398 if (up->port.ignore_status_mask == 0xff ||
399 (r1 & up->port.ignore_status_mask) == 0) {
400 tty_insert_flip_char(tty, ch, flag);
401 }
402 if (r1 & Rx_OVR)
403 tty_insert_flip_char(tty, 0, TTY_OVERRUN);
404 }
405
406 return tty;
407 }
408
409 static void sunzilog_status_handle(struct uart_sunzilog_port *up,
410 struct zilog_channel __iomem *channel)
411 {
412 unsigned char status;
413
414 status = readb(&channel->control);
415 ZSDELAY();
416
417 writeb(RES_EXT_INT, &channel->control);
418 ZSDELAY();
419 ZS_WSYNC(channel);
420
421 if (status & BRK_ABRT) {
422 if (ZS_IS_MOUSE(up))
423 sunzilog_kbdms_receive_chars(up, 0, 1);
424 if (ZS_IS_CONS(up)) {
425 /* Wait for BREAK to deassert to avoid potentially
426 * confusing the PROM.
427 */
428 while (1) {
429 status = readb(&channel->control);
430 ZSDELAY();
431 if (!(status & BRK_ABRT))
432 break;
433 }
434 sun_do_break();
435 return;
436 }
437 }
438
439 if (ZS_WANTS_MODEM_STATUS(up)) {
440 if (status & SYNC)
441 up->port.icount.dsr++;
442
443 /* The Zilog just gives us an interrupt when DCD/CTS/etc. change.
444 * But it does not tell us which bit has changed, we have to keep
445 * track of this ourselves.
446 */
447 if ((status ^ up->prev_status) ^ DCD)
448 uart_handle_dcd_change(&up->port,
449 (status & DCD));
450 if ((status ^ up->prev_status) ^ CTS)
451 uart_handle_cts_change(&up->port,
452 (status & CTS));
453
454 wake_up_interruptible(&up->port.info->delta_msr_wait);
455 }
456
457 up->prev_status = status;
458 }
459
460 static void sunzilog_transmit_chars(struct uart_sunzilog_port *up,
461 struct zilog_channel __iomem *channel)
462 {
463 struct circ_buf *xmit;
464
465 if (ZS_IS_CONS(up)) {
466 unsigned char status = readb(&channel->control);
467 ZSDELAY();
468
469 /* TX still busy? Just wait for the next TX done interrupt.
470 *
471 * It can occur because of how we do serial console writes. It would
472 * be nice to transmit console writes just like we normally would for
473 * a TTY line. (ie. buffered and TX interrupt driven). That is not
474 * easy because console writes cannot sleep. One solution might be
475 * to poll on enough port->xmit space becomming free. -DaveM
476 */
477 if (!(status & Tx_BUF_EMP))
478 return;
479 }
480
481 up->flags &= ~SUNZILOG_FLAG_TX_ACTIVE;
482
483 if (ZS_REGS_HELD(up)) {
484 __load_zsregs(channel, up->curregs);
485 up->flags &= ~SUNZILOG_FLAG_REGS_HELD;
486 }
487
488 if (ZS_TX_STOPPED(up)) {
489 up->flags &= ~SUNZILOG_FLAG_TX_STOPPED;
490 goto ack_tx_int;
491 }
492
493 if (up->port.x_char) {
494 up->flags |= SUNZILOG_FLAG_TX_ACTIVE;
495 writeb(up->port.x_char, &channel->data);
496 ZSDELAY();
497 ZS_WSYNC(channel);
498
499 up->port.icount.tx++;
500 up->port.x_char = 0;
501 return;
502 }
503
504 if (up->port.info == NULL)
505 goto ack_tx_int;
506 xmit = &up->port.info->xmit;
507 if (uart_circ_empty(xmit))
508 goto ack_tx_int;
509
510 if (uart_tx_stopped(&up->port))
511 goto ack_tx_int;
512
513 up->flags |= SUNZILOG_FLAG_TX_ACTIVE;
514 writeb(xmit->buf[xmit->tail], &channel->data);
515 ZSDELAY();
516 ZS_WSYNC(channel);
517
518 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
519 up->port.icount.tx++;
520
521 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
522 uart_write_wakeup(&up->port);
523
524 return;
525
526 ack_tx_int:
527 writeb(RES_Tx_P, &channel->control);
528 ZSDELAY();
529 ZS_WSYNC(channel);
530 }
531
532 static irqreturn_t sunzilog_interrupt(int irq, void *dev_id)
533 {
534 struct uart_sunzilog_port *up = dev_id;
535
536 while (up) {
537 struct zilog_channel __iomem *channel
538 = ZILOG_CHANNEL_FROM_PORT(&up->port);
539 struct tty_struct *tty;
540 unsigned char r3;
541
542 spin_lock(&up->port.lock);
543 r3 = read_zsreg(channel, R3);
544
545 /* Channel A */
546 tty = NULL;
547 if (r3 & (CHAEXT | CHATxIP | CHARxIP)) {
548 writeb(RES_H_IUS, &channel->control);
549 ZSDELAY();
550 ZS_WSYNC(channel);
551
552 if (r3 & CHARxIP)
553 tty = sunzilog_receive_chars(up, channel);
554 if (r3 & CHAEXT)
555 sunzilog_status_handle(up, channel);
556 if (r3 & CHATxIP)
557 sunzilog_transmit_chars(up, channel);
558 }
559 spin_unlock(&up->port.lock);
560
561 if (tty)
562 tty_flip_buffer_push(tty);
563
564 /* Channel B */
565 up = up->next;
566 channel = ZILOG_CHANNEL_FROM_PORT(&up->port);
567
568 spin_lock(&up->port.lock);
569 tty = NULL;
570 if (r3 & (CHBEXT | CHBTxIP | CHBRxIP)) {
571 writeb(RES_H_IUS, &channel->control);
572 ZSDELAY();
573 ZS_WSYNC(channel);
574
575 if (r3 & CHBRxIP)
576 tty = sunzilog_receive_chars(up, channel);
577 if (r3 & CHBEXT)
578 sunzilog_status_handle(up, channel);
579 if (r3 & CHBTxIP)
580 sunzilog_transmit_chars(up, channel);
581 }
582 spin_unlock(&up->port.lock);
583
584 if (tty)
585 tty_flip_buffer_push(tty);
586
587 up = up->next;
588 }
589
590 return IRQ_HANDLED;
591 }
592
593 /* A convenient way to quickly get R0 status. The caller must _not_ hold the
594 * port lock, it is acquired here.
595 */
596 static __inline__ unsigned char sunzilog_read_channel_status(struct uart_port *port)
597 {
598 struct zilog_channel __iomem *channel;
599 unsigned char status;
600
601 channel = ZILOG_CHANNEL_FROM_PORT(port);
602 status = readb(&channel->control);
603 ZSDELAY();
604
605 return status;
606 }
607
608 /* The port lock is not held. */
609 static unsigned int sunzilog_tx_empty(struct uart_port *port)
610 {
611 unsigned long flags;
612 unsigned char status;
613 unsigned int ret;
614
615 spin_lock_irqsave(&port->lock, flags);
616
617 status = sunzilog_read_channel_status(port);
618
619 spin_unlock_irqrestore(&port->lock, flags);
620
621 if (status & Tx_BUF_EMP)
622 ret = TIOCSER_TEMT;
623 else
624 ret = 0;
625
626 return ret;
627 }
628
629 /* The port lock is held and interrupts are disabled. */
630 static unsigned int sunzilog_get_mctrl(struct uart_port *port)
631 {
632 unsigned char status;
633 unsigned int ret;
634
635 status = sunzilog_read_channel_status(port);
636
637 ret = 0;
638 if (status & DCD)
639 ret |= TIOCM_CAR;
640 if (status & SYNC)
641 ret |= TIOCM_DSR;
642 if (status & CTS)
643 ret |= TIOCM_CTS;
644
645 return ret;
646 }
647
648 /* The port lock is held and interrupts are disabled. */
649 static void sunzilog_set_mctrl(struct uart_port *port, unsigned int mctrl)
650 {
651 struct uart_sunzilog_port *up = (struct uart_sunzilog_port *) port;
652 struct zilog_channel __iomem *channel = ZILOG_CHANNEL_FROM_PORT(port);
653 unsigned char set_bits, clear_bits;
654
655 set_bits = clear_bits = 0;
656
657 if (mctrl & TIOCM_RTS)
658 set_bits |= RTS;
659 else
660 clear_bits |= RTS;
661 if (mctrl & TIOCM_DTR)
662 set_bits |= DTR;
663 else
664 clear_bits |= DTR;
665
666 /* NOTE: Not subject to 'transmitter active' rule. */
667 up->curregs[R5] |= set_bits;
668 up->curregs[R5] &= ~clear_bits;
669 write_zsreg(channel, R5, up->curregs[R5]);
670 }
671
672 /* The port lock is held and interrupts are disabled. */
673 static void sunzilog_stop_tx(struct uart_port *port)
674 {
675 struct uart_sunzilog_port *up = (struct uart_sunzilog_port *) port;
676
677 up->flags |= SUNZILOG_FLAG_TX_STOPPED;
678 }
679
680 /* The port lock is held and interrupts are disabled. */
681 static void sunzilog_start_tx(struct uart_port *port)
682 {
683 struct uart_sunzilog_port *up = (struct uart_sunzilog_port *) port;
684 struct zilog_channel __iomem *channel = ZILOG_CHANNEL_FROM_PORT(port);
685 unsigned char status;
686
687 up->flags |= SUNZILOG_FLAG_TX_ACTIVE;
688 up->flags &= ~SUNZILOG_FLAG_TX_STOPPED;
689
690 status = readb(&channel->control);
691 ZSDELAY();
692
693 /* TX busy? Just wait for the TX done interrupt. */
694 if (!(status & Tx_BUF_EMP))
695 return;
696
697 /* Send the first character to jump-start the TX done
698 * IRQ sending engine.
699 */
700 if (port->x_char) {
701 writeb(port->x_char, &channel->data);
702 ZSDELAY();
703 ZS_WSYNC(channel);
704
705 port->icount.tx++;
706 port->x_char = 0;
707 } else {
708 struct circ_buf *xmit = &port->info->xmit;
709
710 writeb(xmit->buf[xmit->tail], &channel->data);
711 ZSDELAY();
712 ZS_WSYNC(channel);
713
714 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
715 port->icount.tx++;
716
717 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
718 uart_write_wakeup(&up->port);
719 }
720 }
721
722 /* The port lock is held. */
723 static void sunzilog_stop_rx(struct uart_port *port)
724 {
725 struct uart_sunzilog_port *up = UART_ZILOG(port);
726 struct zilog_channel __iomem *channel;
727
728 if (ZS_IS_CONS(up))
729 return;
730
731 channel = ZILOG_CHANNEL_FROM_PORT(port);
732
733 /* Disable all RX interrupts. */
734 up->curregs[R1] &= ~RxINT_MASK;
735 sunzilog_maybe_update_regs(up, channel);
736 }
737
738 /* The port lock is held. */
739 static void sunzilog_enable_ms(struct uart_port *port)
740 {
741 struct uart_sunzilog_port *up = (struct uart_sunzilog_port *) port;
742 struct zilog_channel __iomem *channel = ZILOG_CHANNEL_FROM_PORT(port);
743 unsigned char new_reg;
744
745 new_reg = up->curregs[R15] | (DCDIE | SYNCIE | CTSIE);
746 if (new_reg != up->curregs[R15]) {
747 up->curregs[R15] = new_reg;
748
749 /* NOTE: Not subject to 'transmitter active' rule. */
750 write_zsreg(channel, R15, up->curregs[R15] & ~WR7pEN);
751 }
752 }
753
754 /* The port lock is not held. */
755 static void sunzilog_break_ctl(struct uart_port *port, int break_state)
756 {
757 struct uart_sunzilog_port *up = (struct uart_sunzilog_port *) port;
758 struct zilog_channel __iomem *channel = ZILOG_CHANNEL_FROM_PORT(port);
759 unsigned char set_bits, clear_bits, new_reg;
760 unsigned long flags;
761
762 set_bits = clear_bits = 0;
763
764 if (break_state)
765 set_bits |= SND_BRK;
766 else
767 clear_bits |= SND_BRK;
768
769 spin_lock_irqsave(&port->lock, flags);
770
771 new_reg = (up->curregs[R5] | set_bits) & ~clear_bits;
772 if (new_reg != up->curregs[R5]) {
773 up->curregs[R5] = new_reg;
774
775 /* NOTE: Not subject to 'transmitter active' rule. */
776 write_zsreg(channel, R5, up->curregs[R5]);
777 }
778
779 spin_unlock_irqrestore(&port->lock, flags);
780 }
781
782 static void __sunzilog_startup(struct uart_sunzilog_port *up)
783 {
784 struct zilog_channel __iomem *channel;
785
786 channel = ZILOG_CHANNEL_FROM_PORT(&up->port);
787 up->prev_status = readb(&channel->control);
788
789 /* Enable receiver and transmitter. */
790 up->curregs[R3] |= RxENAB;
791 up->curregs[R5] |= TxENAB;
792
793 up->curregs[R1] |= EXT_INT_ENAB | INT_ALL_Rx | TxINT_ENAB;
794 sunzilog_maybe_update_regs(up, channel);
795 }
796
797 static int sunzilog_startup(struct uart_port *port)
798 {
799 struct uart_sunzilog_port *up = UART_ZILOG(port);
800 unsigned long flags;
801
802 if (ZS_IS_CONS(up))
803 return 0;
804
805 spin_lock_irqsave(&port->lock, flags);
806 __sunzilog_startup(up);
807 spin_unlock_irqrestore(&port->lock, flags);
808 return 0;
809 }
810
811 /*
812 * The test for ZS_IS_CONS is explained by the following e-mail:
813 *****
814 * From: Russell King <rmk@arm.linux.org.uk>
815 * Date: Sun, 8 Dec 2002 10:18:38 +0000
816 *
817 * On Sun, Dec 08, 2002 at 02:43:36AM -0500, Pete Zaitcev wrote:
818 * > I boot my 2.5 boxes using "console=ttyS0,9600" argument,
819 * > and I noticed that something is not right with reference
820 * > counting in this case. It seems that when the console
821 * > is open by kernel initially, this is not accounted
822 * > as an open, and uart_startup is not called.
823 *
824 * That is correct. We are unable to call uart_startup when the serial
825 * console is initialised because it may need to allocate memory (as
826 * request_irq does) and the memory allocators may not have been
827 * initialised.
828 *
829 * 1. initialise the port into a state where it can send characters in the
830 * console write method.
831 *
832 * 2. don't do the actual hardware shutdown in your shutdown() method (but
833 * do the normal software shutdown - ie, free irqs etc)
834 *****
835 */
836 static void sunzilog_shutdown(struct uart_port *port)
837 {
838 struct uart_sunzilog_port *up = UART_ZILOG(port);
839 struct zilog_channel __iomem *channel;
840 unsigned long flags;
841
842 if (ZS_IS_CONS(up))
843 return;
844
845 spin_lock_irqsave(&port->lock, flags);
846
847 channel = ZILOG_CHANNEL_FROM_PORT(port);
848
849 /* Disable receiver and transmitter. */
850 up->curregs[R3] &= ~RxENAB;
851 up->curregs[R5] &= ~TxENAB;
852
853 /* Disable all interrupts and BRK assertion. */
854 up->curregs[R1] &= ~(EXT_INT_ENAB | TxINT_ENAB | RxINT_MASK);
855 up->curregs[R5] &= ~SND_BRK;
856 sunzilog_maybe_update_regs(up, channel);
857
858 spin_unlock_irqrestore(&port->lock, flags);
859 }
860
861 /* Shared by TTY driver and serial console setup. The port lock is held
862 * and local interrupts are disabled.
863 */
864 static void
865 sunzilog_convert_to_zs(struct uart_sunzilog_port *up, unsigned int cflag,
866 unsigned int iflag, int brg)
867 {
868
869 up->curregs[R10] = NRZ;
870 up->curregs[R11] = TCBR | RCBR;
871
872 /* Program BAUD and clock source. */
873 up->curregs[R4] &= ~XCLK_MASK;
874 up->curregs[R4] |= X16CLK;
875 up->curregs[R12] = brg & 0xff;
876 up->curregs[R13] = (brg >> 8) & 0xff;
877 up->curregs[R14] = BRSRC | BRENAB;
878
879 /* Character size, stop bits, and parity. */
880 up->curregs[R3] &= ~RxN_MASK;
881 up->curregs[R5] &= ~TxN_MASK;
882 switch (cflag & CSIZE) {
883 case CS5:
884 up->curregs[R3] |= Rx5;
885 up->curregs[R5] |= Tx5;
886 up->parity_mask = 0x1f;
887 break;
888 case CS6:
889 up->curregs[R3] |= Rx6;
890 up->curregs[R5] |= Tx6;
891 up->parity_mask = 0x3f;
892 break;
893 case CS7:
894 up->curregs[R3] |= Rx7;
895 up->curregs[R5] |= Tx7;
896 up->parity_mask = 0x7f;
897 break;
898 case CS8:
899 default:
900 up->curregs[R3] |= Rx8;
901 up->curregs[R5] |= Tx8;
902 up->parity_mask = 0xff;
903 break;
904 };
905 up->curregs[R4] &= ~0x0c;
906 if (cflag & CSTOPB)
907 up->curregs[R4] |= SB2;
908 else
909 up->curregs[R4] |= SB1;
910 if (cflag & PARENB)
911 up->curregs[R4] |= PAR_ENAB;
912 else
913 up->curregs[R4] &= ~PAR_ENAB;
914 if (!(cflag & PARODD))
915 up->curregs[R4] |= PAR_EVEN;
916 else
917 up->curregs[R4] &= ~PAR_EVEN;
918
919 up->port.read_status_mask = Rx_OVR;
920 if (iflag & INPCK)
921 up->port.read_status_mask |= CRC_ERR | PAR_ERR;
922 if (iflag & (BRKINT | PARMRK))
923 up->port.read_status_mask |= BRK_ABRT;
924
925 up->port.ignore_status_mask = 0;
926 if (iflag & IGNPAR)
927 up->port.ignore_status_mask |= CRC_ERR | PAR_ERR;
928 if (iflag & IGNBRK) {
929 up->port.ignore_status_mask |= BRK_ABRT;
930 if (iflag & IGNPAR)
931 up->port.ignore_status_mask |= Rx_OVR;
932 }
933
934 if ((cflag & CREAD) == 0)
935 up->port.ignore_status_mask = 0xff;
936 }
937
938 /* The port lock is not held. */
939 static void
940 sunzilog_set_termios(struct uart_port *port, struct ktermios *termios,
941 struct ktermios *old)
942 {
943 struct uart_sunzilog_port *up = (struct uart_sunzilog_port *) port;
944 unsigned long flags;
945 int baud, brg;
946
947 baud = uart_get_baud_rate(port, termios, old, 1200, 76800);
948
949 spin_lock_irqsave(&up->port.lock, flags);
950
951 brg = BPS_TO_BRG(baud, ZS_CLOCK / ZS_CLOCK_DIVISOR);
952
953 sunzilog_convert_to_zs(up, termios->c_cflag, termios->c_iflag, brg);
954
955 if (UART_ENABLE_MS(&up->port, termios->c_cflag))
956 up->flags |= SUNZILOG_FLAG_MODEM_STATUS;
957 else
958 up->flags &= ~SUNZILOG_FLAG_MODEM_STATUS;
959
960 up->cflag = termios->c_cflag;
961
962 sunzilog_maybe_update_regs(up, ZILOG_CHANNEL_FROM_PORT(port));
963
964 uart_update_timeout(port, termios->c_cflag, baud);
965
966 spin_unlock_irqrestore(&up->port.lock, flags);
967 }
968
969 static const char *sunzilog_type(struct uart_port *port)
970 {
971 struct uart_sunzilog_port *up = UART_ZILOG(port);
972
973 return (up->flags & SUNZILOG_FLAG_ESCC) ? "zs (ESCC)" : "zs";
974 }
975
976 /* We do not request/release mappings of the registers here, this
977 * happens at early serial probe time.
978 */
979 static void sunzilog_release_port(struct uart_port *port)
980 {
981 }
982
983 static int sunzilog_request_port(struct uart_port *port)
984 {
985 return 0;
986 }
987
988 /* These do not need to do anything interesting either. */
989 static void sunzilog_config_port(struct uart_port *port, int flags)
990 {
991 }
992
993 /* We do not support letting the user mess with the divisor, IRQ, etc. */
994 static int sunzilog_verify_port(struct uart_port *port, struct serial_struct *ser)
995 {
996 return -EINVAL;
997 }
998
999 static struct uart_ops sunzilog_pops = {
1000 .tx_empty = sunzilog_tx_empty,
1001 .set_mctrl = sunzilog_set_mctrl,
1002 .get_mctrl = sunzilog_get_mctrl,
1003 .stop_tx = sunzilog_stop_tx,
1004 .start_tx = sunzilog_start_tx,
1005 .stop_rx = sunzilog_stop_rx,
1006 .enable_ms = sunzilog_enable_ms,
1007 .break_ctl = sunzilog_break_ctl,
1008 .startup = sunzilog_startup,
1009 .shutdown = sunzilog_shutdown,
1010 .set_termios = sunzilog_set_termios,
1011 .type = sunzilog_type,
1012 .release_port = sunzilog_release_port,
1013 .request_port = sunzilog_request_port,
1014 .config_port = sunzilog_config_port,
1015 .verify_port = sunzilog_verify_port,
1016 };
1017
1018 static struct uart_sunzilog_port *sunzilog_port_table;
1019 static struct zilog_layout __iomem **sunzilog_chip_regs;
1020
1021 static struct uart_sunzilog_port *sunzilog_irq_chain;
1022
1023 static struct uart_driver sunzilog_reg = {
1024 .owner = THIS_MODULE,
1025 .driver_name = "ttyS",
1026 .dev_name = "ttyS",
1027 .major = TTY_MAJOR,
1028 };
1029
1030 static int __init sunzilog_alloc_tables(int num_sunzilog)
1031 {
1032 struct uart_sunzilog_port *up;
1033 unsigned long size;
1034 int num_channels = num_sunzilog * 2;
1035 int i;
1036
1037 size = num_channels * sizeof(struct uart_sunzilog_port);
1038 sunzilog_port_table = kzalloc(size, GFP_KERNEL);
1039 if (!sunzilog_port_table)
1040 return -ENOMEM;
1041
1042 for (i = 0; i < num_channels; i++) {
1043 up = &sunzilog_port_table[i];
1044
1045 spin_lock_init(&up->port.lock);
1046
1047 if (i == 0)
1048 sunzilog_irq_chain = up;
1049
1050 if (i < num_channels - 1)
1051 up->next = up + 1;
1052 else
1053 up->next = NULL;
1054 }
1055
1056 size = num_sunzilog * sizeof(struct zilog_layout __iomem *);
1057 sunzilog_chip_regs = kzalloc(size, GFP_KERNEL);
1058 if (!sunzilog_chip_regs) {
1059 kfree(sunzilog_port_table);
1060 sunzilog_irq_chain = NULL;
1061 return -ENOMEM;
1062 }
1063
1064 return 0;
1065 }
1066
1067 static void sunzilog_free_tables(void)
1068 {
1069 kfree(sunzilog_port_table);
1070 sunzilog_irq_chain = NULL;
1071 kfree(sunzilog_chip_regs);
1072 }
1073
1074 #define ZS_PUT_CHAR_MAX_DELAY 2000 /* 10 ms */
1075
1076 static void sunzilog_putchar(struct uart_port *port, int ch)
1077 {
1078 struct zilog_channel __iomem *channel = ZILOG_CHANNEL_FROM_PORT(port);
1079 int loops = ZS_PUT_CHAR_MAX_DELAY;
1080
1081 /* This is a timed polling loop so do not switch the explicit
1082 * udelay with ZSDELAY as that is a NOP on some platforms. -DaveM
1083 */
1084 do {
1085 unsigned char val = readb(&channel->control);
1086 if (val & Tx_BUF_EMP) {
1087 ZSDELAY();
1088 break;
1089 }
1090 udelay(5);
1091 } while (--loops);
1092
1093 writeb(ch, &channel->data);
1094 ZSDELAY();
1095 ZS_WSYNC(channel);
1096 }
1097
1098 #ifdef CONFIG_SERIO
1099
1100 static DEFINE_SPINLOCK(sunzilog_serio_lock);
1101
1102 static int sunzilog_serio_write(struct serio *serio, unsigned char ch)
1103 {
1104 struct uart_sunzilog_port *up = serio->port_data;
1105 unsigned long flags;
1106
1107 spin_lock_irqsave(&sunzilog_serio_lock, flags);
1108
1109 sunzilog_putchar(&up->port, ch);
1110
1111 spin_unlock_irqrestore(&sunzilog_serio_lock, flags);
1112
1113 return 0;
1114 }
1115
1116 static int sunzilog_serio_open(struct serio *serio)
1117 {
1118 struct uart_sunzilog_port *up = serio->port_data;
1119 unsigned long flags;
1120 int ret;
1121
1122 spin_lock_irqsave(&sunzilog_serio_lock, flags);
1123 if (!up->serio_open) {
1124 up->serio_open = 1;
1125 ret = 0;
1126 } else
1127 ret = -EBUSY;
1128 spin_unlock_irqrestore(&sunzilog_serio_lock, flags);
1129
1130 return ret;
1131 }
1132
1133 static void sunzilog_serio_close(struct serio *serio)
1134 {
1135 struct uart_sunzilog_port *up = serio->port_data;
1136 unsigned long flags;
1137
1138 spin_lock_irqsave(&sunzilog_serio_lock, flags);
1139 up->serio_open = 0;
1140 spin_unlock_irqrestore(&sunzilog_serio_lock, flags);
1141 }
1142
1143 #endif /* CONFIG_SERIO */
1144
1145 #ifdef CONFIG_SERIAL_SUNZILOG_CONSOLE
1146 static void
1147 sunzilog_console_write(struct console *con, const char *s, unsigned int count)
1148 {
1149 struct uart_sunzilog_port *up = &sunzilog_port_table[con->index];
1150 unsigned long flags;
1151 int locked = 1;
1152
1153 local_irq_save(flags);
1154 if (up->port.sysrq) {
1155 locked = 0;
1156 } else if (oops_in_progress) {
1157 locked = spin_trylock(&up->port.lock);
1158 } else
1159 spin_lock(&up->port.lock);
1160
1161 uart_console_write(&up->port, s, count, sunzilog_putchar);
1162 udelay(2);
1163
1164 if (locked)
1165 spin_unlock(&up->port.lock);
1166 local_irq_restore(flags);
1167 }
1168
1169 static int __init sunzilog_console_setup(struct console *con, char *options)
1170 {
1171 struct uart_sunzilog_port *up = &sunzilog_port_table[con->index];
1172 unsigned long flags;
1173 int baud, brg;
1174
1175 if (up->port.type != PORT_SUNZILOG)
1176 return -1;
1177
1178 printk(KERN_INFO "Console: ttyS%d (SunZilog zs%d)\n",
1179 (sunzilog_reg.minor - 64) + con->index, con->index);
1180
1181 /* Get firmware console settings. */
1182 sunserial_console_termios(con);
1183
1184 /* Firmware console speed is limited to 150-->38400 baud so
1185 * this hackish cflag thing is OK.
1186 */
1187 switch (con->cflag & CBAUD) {
1188 case B150: baud = 150; break;
1189 case B300: baud = 300; break;
1190 case B600: baud = 600; break;
1191 case B1200: baud = 1200; break;
1192 case B2400: baud = 2400; break;
1193 case B4800: baud = 4800; break;
1194 default: case B9600: baud = 9600; break;
1195 case B19200: baud = 19200; break;
1196 case B38400: baud = 38400; break;
1197 };
1198
1199 brg = BPS_TO_BRG(baud, ZS_CLOCK / ZS_CLOCK_DIVISOR);
1200
1201 spin_lock_irqsave(&up->port.lock, flags);
1202
1203 up->curregs[R15] |= BRKIE;
1204 sunzilog_convert_to_zs(up, con->cflag, 0, brg);
1205
1206 sunzilog_set_mctrl(&up->port, TIOCM_DTR | TIOCM_RTS);
1207 __sunzilog_startup(up);
1208
1209 spin_unlock_irqrestore(&up->port.lock, flags);
1210
1211 return 0;
1212 }
1213
1214 static struct console sunzilog_console_ops = {
1215 .name = "ttyS",
1216 .write = sunzilog_console_write,
1217 .device = uart_console_device,
1218 .setup = sunzilog_console_setup,
1219 .flags = CON_PRINTBUFFER,
1220 .index = -1,
1221 .data = &sunzilog_reg,
1222 };
1223
1224 static inline struct console *SUNZILOG_CONSOLE(void)
1225 {
1226 return &sunzilog_console_ops;
1227 }
1228
1229 #else
1230 #define SUNZILOG_CONSOLE() (NULL)
1231 #endif
1232
1233 static void __devinit sunzilog_init_kbdms(struct uart_sunzilog_port *up, int channel)
1234 {
1235 int baud, brg;
1236
1237 if (up->flags & SUNZILOG_FLAG_CONS_KEYB) {
1238 up->cflag = B1200 | CS8 | CLOCAL | CREAD;
1239 baud = 1200;
1240 } else {
1241 up->cflag = B4800 | CS8 | CLOCAL | CREAD;
1242 baud = 4800;
1243 }
1244
1245 up->curregs[R15] |= BRKIE;
1246 brg = BPS_TO_BRG(baud, ZS_CLOCK / ZS_CLOCK_DIVISOR);
1247 sunzilog_convert_to_zs(up, up->cflag, 0, brg);
1248 sunzilog_set_mctrl(&up->port, TIOCM_DTR | TIOCM_RTS);
1249 __sunzilog_startup(up);
1250 }
1251
1252 #ifdef CONFIG_SERIO
1253 static void __devinit sunzilog_register_serio(struct uart_sunzilog_port *up)
1254 {
1255 struct serio *serio = &up->serio;
1256
1257 serio->port_data = up;
1258
1259 serio->id.type = SERIO_RS232;
1260 if (up->flags & SUNZILOG_FLAG_CONS_KEYB) {
1261 serio->id.proto = SERIO_SUNKBD;
1262 strlcpy(serio->name, "zskbd", sizeof(serio->name));
1263 } else {
1264 serio->id.proto = SERIO_SUN;
1265 serio->id.extra = 1;
1266 strlcpy(serio->name, "zsms", sizeof(serio->name));
1267 }
1268 strlcpy(serio->phys,
1269 ((up->flags & SUNZILOG_FLAG_CONS_KEYB) ?
1270 "zs/serio0" : "zs/serio1"),
1271 sizeof(serio->phys));
1272
1273 serio->write = sunzilog_serio_write;
1274 serio->open = sunzilog_serio_open;
1275 serio->close = sunzilog_serio_close;
1276 serio->dev.parent = up->port.dev;
1277
1278 serio_register_port(serio);
1279 }
1280 #endif
1281
1282 static void __devinit sunzilog_init_hw(struct uart_sunzilog_port *up)
1283 {
1284 struct zilog_channel __iomem *channel;
1285 unsigned long flags;
1286 int baud, brg;
1287
1288 channel = ZILOG_CHANNEL_FROM_PORT(&up->port);
1289
1290 spin_lock_irqsave(&up->port.lock, flags);
1291 if (ZS_IS_CHANNEL_A(up)) {
1292 write_zsreg(channel, R9, FHWRES);
1293 ZSDELAY_LONG();
1294 (void) read_zsreg(channel, R0);
1295 }
1296
1297 if (up->flags & (SUNZILOG_FLAG_CONS_KEYB |
1298 SUNZILOG_FLAG_CONS_MOUSE)) {
1299 up->curregs[R1] = EXT_INT_ENAB | INT_ALL_Rx | TxINT_ENAB;
1300 up->curregs[R4] = PAR_EVEN | X16CLK | SB1;
1301 up->curregs[R3] = RxENAB | Rx8;
1302 up->curregs[R5] = TxENAB | Tx8;
1303 up->curregs[R6] = 0x00; /* SDLC Address */
1304 up->curregs[R7] = 0x7E; /* SDLC Flag */
1305 up->curregs[R9] = NV;
1306 up->curregs[R7p] = 0x00;
1307 sunzilog_init_kbdms(up, up->port.line);
1308 /* Only enable interrupts if an ISR handler available */
1309 if (up->flags & SUNZILOG_FLAG_ISR_HANDLER)
1310 up->curregs[R9] |= MIE;
1311 write_zsreg(channel, R9, up->curregs[R9]);
1312 } else {
1313 /* Normal serial TTY. */
1314 up->parity_mask = 0xff;
1315 up->curregs[R1] = EXT_INT_ENAB | INT_ALL_Rx | TxINT_ENAB;
1316 up->curregs[R4] = PAR_EVEN | X16CLK | SB1;
1317 up->curregs[R3] = RxENAB | Rx8;
1318 up->curregs[R5] = TxENAB | Tx8;
1319 up->curregs[R6] = 0x00; /* SDLC Address */
1320 up->curregs[R7] = 0x7E; /* SDLC Flag */
1321 up->curregs[R9] = NV;
1322 up->curregs[R10] = NRZ;
1323 up->curregs[R11] = TCBR | RCBR;
1324 baud = 9600;
1325 brg = BPS_TO_BRG(baud, ZS_CLOCK / ZS_CLOCK_DIVISOR);
1326 up->curregs[R12] = (brg & 0xff);
1327 up->curregs[R13] = (brg >> 8) & 0xff;
1328 up->curregs[R14] = BRSRC | BRENAB;
1329 up->curregs[R15] = FIFOEN; /* Use FIFO if on ESCC */
1330 up->curregs[R7p] = TxFIFO_LVL | RxFIFO_LVL;
1331 if (__load_zsregs(channel, up->curregs)) {
1332 up->flags |= SUNZILOG_FLAG_ESCC;
1333 }
1334 /* Only enable interrupts if an ISR handler available */
1335 if (up->flags & SUNZILOG_FLAG_ISR_HANDLER)
1336 up->curregs[R9] |= MIE;
1337 write_zsreg(channel, R9, up->curregs[R9]);
1338 }
1339
1340 spin_unlock_irqrestore(&up->port.lock, flags);
1341
1342 #ifdef CONFIG_SERIO
1343 if (up->flags & (SUNZILOG_FLAG_CONS_KEYB |
1344 SUNZILOG_FLAG_CONS_MOUSE))
1345 sunzilog_register_serio(up);
1346 #endif
1347 }
1348
1349 static int zilog_irq = -1;
1350
1351 static int __devinit zs_probe(struct of_device *op, const struct of_device_id *match)
1352 {
1353 static int inst;
1354 struct uart_sunzilog_port *up;
1355 struct zilog_layout __iomem *rp;
1356 int keyboard_mouse;
1357 int err;
1358
1359 keyboard_mouse = 0;
1360 if (of_find_property(op->node, "keyboard", NULL))
1361 keyboard_mouse = 1;
1362
1363 sunzilog_chip_regs[inst] = of_ioremap(&op->resource[0], 0,
1364 sizeof(struct zilog_layout),
1365 "zs");
1366 if (!sunzilog_chip_regs[inst])
1367 return -ENOMEM;
1368
1369 rp = sunzilog_chip_regs[inst];
1370
1371 if (zilog_irq == -1)
1372 zilog_irq = op->irqs[0];
1373
1374 up = &sunzilog_port_table[inst * 2];
1375
1376 /* Channel A */
1377 up[0].port.mapbase = op->resource[0].start + 0x00;
1378 up[0].port.membase = (void __iomem *) &rp->channelA;
1379 up[0].port.iotype = UPIO_MEM;
1380 up[0].port.irq = op->irqs[0];
1381 up[0].port.uartclk = ZS_CLOCK;
1382 up[0].port.fifosize = 1;
1383 up[0].port.ops = &sunzilog_pops;
1384 up[0].port.type = PORT_SUNZILOG;
1385 up[0].port.flags = 0;
1386 up[0].port.line = (inst * 2) + 0;
1387 up[0].port.dev = &op->dev;
1388 up[0].flags |= SUNZILOG_FLAG_IS_CHANNEL_A;
1389 if (keyboard_mouse)
1390 up[0].flags |= SUNZILOG_FLAG_CONS_KEYB;
1391 sunzilog_init_hw(&up[0]);
1392
1393 /* Channel B */
1394 up[1].port.mapbase = op->resource[0].start + 0x04;
1395 up[1].port.membase = (void __iomem *) &rp->channelB;
1396 up[1].port.iotype = UPIO_MEM;
1397 up[1].port.irq = op->irqs[0];
1398 up[1].port.uartclk = ZS_CLOCK;
1399 up[1].port.fifosize = 1;
1400 up[1].port.ops = &sunzilog_pops;
1401 up[1].port.type = PORT_SUNZILOG;
1402 up[1].port.flags = 0;
1403 up[1].port.line = (inst * 2) + 1;
1404 up[1].port.dev = &op->dev;
1405 up[1].flags |= 0;
1406 if (keyboard_mouse)
1407 up[1].flags |= SUNZILOG_FLAG_CONS_MOUSE;
1408 sunzilog_init_hw(&up[1]);
1409
1410 if (!keyboard_mouse) {
1411 if (sunserial_console_match(SUNZILOG_CONSOLE(), op->node,
1412 &sunzilog_reg, up[0].port.line))
1413 up->flags |= SUNZILOG_FLAG_IS_CONS;
1414 err = uart_add_one_port(&sunzilog_reg, &up[0].port);
1415 if (err) {
1416 of_iounmap(&op->resource[0],
1417 rp, sizeof(struct zilog_layout));
1418 return err;
1419 }
1420 if (sunserial_console_match(SUNZILOG_CONSOLE(), op->node,
1421 &sunzilog_reg, up[1].port.line))
1422 up->flags |= SUNZILOG_FLAG_IS_CONS;
1423 err = uart_add_one_port(&sunzilog_reg, &up[1].port);
1424 if (err) {
1425 uart_remove_one_port(&sunzilog_reg, &up[0].port);
1426 of_iounmap(&op->resource[0],
1427 rp, sizeof(struct zilog_layout));
1428 return err;
1429 }
1430 } else {
1431 printk(KERN_INFO "%s: Keyboard at MMIO 0x%llx (irq = %d) "
1432 "is a %s\n",
1433 op->dev.bus_id,
1434 (unsigned long long) up[0].port.mapbase,
1435 op->irqs[0], sunzilog_type(&up[0].port));
1436 printk(KERN_INFO "%s: Mouse at MMIO 0x%llx (irq = %d) "
1437 "is a %s\n",
1438 op->dev.bus_id,
1439 (unsigned long long) up[1].port.mapbase,
1440 op->irqs[0], sunzilog_type(&up[1].port));
1441 }
1442
1443 dev_set_drvdata(&op->dev, &up[0]);
1444
1445 inst++;
1446
1447 return 0;
1448 }
1449
1450 static void __devexit zs_remove_one(struct uart_sunzilog_port *up)
1451 {
1452 if (ZS_IS_KEYB(up) || ZS_IS_MOUSE(up)) {
1453 #ifdef CONFIG_SERIO
1454 serio_unregister_port(&up->serio);
1455 #endif
1456 } else
1457 uart_remove_one_port(&sunzilog_reg, &up->port);
1458 }
1459
1460 static int __devexit zs_remove(struct of_device *op)
1461 {
1462 struct uart_sunzilog_port *up = dev_get_drvdata(&op->dev);
1463 struct zilog_layout __iomem *regs;
1464
1465 zs_remove_one(&up[0]);
1466 zs_remove_one(&up[1]);
1467
1468 regs = sunzilog_chip_regs[up[0].port.line / 2];
1469 of_iounmap(&op->resource[0], regs, sizeof(struct zilog_layout));
1470
1471 dev_set_drvdata(&op->dev, NULL);
1472
1473 return 0;
1474 }
1475
1476 static struct of_device_id zs_match[] = {
1477 {
1478 .name = "zs",
1479 },
1480 {},
1481 };
1482 MODULE_DEVICE_TABLE(of, zs_match);
1483
1484 static struct of_platform_driver zs_driver = {
1485 .name = "zs",
1486 .match_table = zs_match,
1487 .probe = zs_probe,
1488 .remove = __devexit_p(zs_remove),
1489 };
1490
1491 static int __init sunzilog_init(void)
1492 {
1493 struct device_node *dp;
1494 int err, uart_count;
1495 int num_keybms;
1496 int num_sunzilog = 0;
1497
1498 num_keybms = 0;
1499 for_each_node_by_name(dp, "zs") {
1500 num_sunzilog++;
1501 if (of_find_property(dp, "keyboard", NULL))
1502 num_keybms++;
1503 }
1504
1505 uart_count = 0;
1506 if (num_sunzilog) {
1507 int uart_count;
1508
1509 err = sunzilog_alloc_tables(num_sunzilog);
1510 if (err)
1511 goto out;
1512
1513 uart_count = (num_sunzilog * 2) - (2 * num_keybms);
1514
1515 err = sunserial_register_minors(&sunzilog_reg, uart_count);
1516 if (err)
1517 goto out_free_tables;
1518 }
1519
1520 err = of_register_driver(&zs_driver, &of_bus_type);
1521 if (err)
1522 goto out_unregister_uart;
1523
1524 if (zilog_irq != -1) {
1525 struct uart_sunzilog_port *up = sunzilog_irq_chain;
1526 err = request_irq(zilog_irq, sunzilog_interrupt, IRQF_SHARED,
1527 "zs", sunzilog_irq_chain);
1528 if (err)
1529 goto out_unregister_driver;
1530
1531 /* Enable Interrupts */
1532 while (up) {
1533 struct zilog_channel __iomem *channel;
1534
1535 /* printk (KERN_INFO "Enable IRQ for ZILOG Hardware %p\n", up); */
1536 channel = ZILOG_CHANNEL_FROM_PORT(&up->port);
1537 up->flags |= SUNZILOG_FLAG_ISR_HANDLER;
1538 up->curregs[R9] |= MIE;
1539 write_zsreg(channel, R9, up->curregs[R9]);
1540 up = up->next;
1541 }
1542 }
1543
1544 out:
1545 return err;
1546
1547 out_unregister_driver:
1548 of_unregister_driver(&zs_driver);
1549
1550 out_unregister_uart:
1551 if (num_sunzilog) {
1552 sunserial_unregister_minors(&sunzilog_reg, num_sunzilog);
1553 sunzilog_reg.cons = NULL;
1554 }
1555
1556 out_free_tables:
1557 sunzilog_free_tables();
1558 goto out;
1559 }
1560
1561 static void __exit sunzilog_exit(void)
1562 {
1563 of_unregister_driver(&zs_driver);
1564
1565 if (zilog_irq != -1) {
1566 struct uart_sunzilog_port *up = sunzilog_irq_chain;
1567
1568 /* Disable Interrupts */
1569 while (up) {
1570 struct zilog_channel __iomem *channel;
1571
1572 /* printk (KERN_INFO "Disable IRQ for ZILOG Hardware %p\n", up); */
1573 channel = ZILOG_CHANNEL_FROM_PORT(&up->port);
1574 up->flags &= ~SUNZILOG_FLAG_ISR_HANDLER;
1575 up->curregs[R9] &= ~MIE;
1576 write_zsreg(channel, R9, up->curregs[R9]);
1577 up = up->next;
1578 }
1579
1580 free_irq(zilog_irq, sunzilog_irq_chain);
1581 zilog_irq = -1;
1582 }
1583
1584 if (sunzilog_reg.nr) {
1585 sunserial_unregister_minors(&sunzilog_reg, sunzilog_reg.nr);
1586 sunzilog_free_tables();
1587 }
1588 }
1589
1590 module_init(sunzilog_init);
1591 module_exit(sunzilog_exit);
1592
1593 MODULE_AUTHOR("David S. Miller");
1594 MODULE_DESCRIPTION("Sun Zilog serial port driver");
1595 MODULE_VERSION("2.0");
1596 MODULE_LICENSE("GPL");
WRT350N Kernel Patches