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[SERIAL]: Fix console write locking in sparc drivers.
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / serial / sunzilog.c
blob0a3e10a4a35dec59485e1455b5ee8f30a0277c25
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 static int num_sunzilog;
67 #define NUM_SUNZILOG num_sunzilog
68 #define NUM_CHANNELS (NUM_SUNZILOG * 2)
69
70 #define ZS_CLOCK 4915200 /* Zilog input clock rate. */
71 #define ZS_CLOCK_DIVISOR 16 /* Divisor this driver uses. */
72
73 /*
74 * We wrap our port structure around the generic uart_port.
75 */
76 struct uart_sunzilog_port {
77 struct uart_port port;
78
79 /* IRQ servicing chain. */
80 struct uart_sunzilog_port *next;
81
82 /* Current values of Zilog write registers. */
83 unsigned char curregs[NUM_ZSREGS];
84
85 unsigned int flags;
86 #define SUNZILOG_FLAG_CONS_KEYB 0x00000001
87 #define SUNZILOG_FLAG_CONS_MOUSE 0x00000002
88 #define SUNZILOG_FLAG_IS_CONS 0x00000004
89 #define SUNZILOG_FLAG_IS_KGDB 0x00000008
90 #define SUNZILOG_FLAG_MODEM_STATUS 0x00000010
91 #define SUNZILOG_FLAG_IS_CHANNEL_A 0x00000020
92 #define SUNZILOG_FLAG_REGS_HELD 0x00000040
93 #define SUNZILOG_FLAG_TX_STOPPED 0x00000080
94 #define SUNZILOG_FLAG_TX_ACTIVE 0x00000100
95 #define SUNZILOG_FLAG_ESCC 0x00000200
96 #define SUNZILOG_FLAG_ISR_HANDLER 0x00000400
97
98 unsigned int cflag;
99
100 unsigned char parity_mask;
101 unsigned char prev_status;
102
103 #ifdef CONFIG_SERIO
104 struct serio serio;
105 int serio_open;
106 #endif
107 };
108
109 #define ZILOG_CHANNEL_FROM_PORT(PORT) ((struct zilog_channel __iomem *)((PORT)->membase))
110 #define UART_ZILOG(PORT) ((struct uart_sunzilog_port *)(PORT))
111
112 #define ZS_IS_KEYB(UP) ((UP)->flags & SUNZILOG_FLAG_CONS_KEYB)
113 #define ZS_IS_MOUSE(UP) ((UP)->flags & SUNZILOG_FLAG_CONS_MOUSE)
114 #define ZS_IS_CONS(UP) ((UP)->flags & SUNZILOG_FLAG_IS_CONS)
115 #define ZS_IS_KGDB(UP) ((UP)->flags & SUNZILOG_FLAG_IS_KGDB)
116 #define ZS_WANTS_MODEM_STATUS(UP) ((UP)->flags & SUNZILOG_FLAG_MODEM_STATUS)
117 #define ZS_IS_CHANNEL_A(UP) ((UP)->flags & SUNZILOG_FLAG_IS_CHANNEL_A)
118 #define ZS_REGS_HELD(UP) ((UP)->flags & SUNZILOG_FLAG_REGS_HELD)
119 #define ZS_TX_STOPPED(UP) ((UP)->flags & SUNZILOG_FLAG_TX_STOPPED)
120 #define ZS_TX_ACTIVE(UP) ((UP)->flags & SUNZILOG_FLAG_TX_ACTIVE)
121
122 /* Reading and writing Zilog8530 registers. The delays are to make this
123 * driver work on the Sun4 which needs a settling delay after each chip
124 * register access, other machines handle this in hardware via auxiliary
125 * flip-flops which implement the settle time we do in software.
126 *
127 * The port lock must be held and local IRQs must be disabled
128 * when {read,write}_zsreg is invoked.
129 */
130 static unsigned char read_zsreg(struct zilog_channel __iomem *channel,
131 unsigned char reg)
132 {
133 unsigned char retval;
134
135 writeb(reg, &channel->control);
136 ZSDELAY();
137 retval = readb(&channel->control);
138 ZSDELAY();
139
140 return retval;
141 }
142
143 static void write_zsreg(struct zilog_channel __iomem *channel,
144 unsigned char reg, unsigned char value)
145 {
146 writeb(reg, &channel->control);
147 ZSDELAY();
148 writeb(value, &channel->control);
149 ZSDELAY();
150 }
151
152 static void sunzilog_clear_fifo(struct zilog_channel __iomem *channel)
153 {
154 int i;
155
156 for (i = 0; i < 32; i++) {
157 unsigned char regval;
158
159 regval = readb(&channel->control);
160 ZSDELAY();
161 if (regval & Rx_CH_AV)
162 break;
163
164 regval = read_zsreg(channel, R1);
165 readb(&channel->data);
166 ZSDELAY();
167
168 if (regval & (PAR_ERR | Rx_OVR | CRC_ERR)) {
169 writeb(ERR_RES, &channel->control);
170 ZSDELAY();
171 ZS_WSYNC(channel);
172 }
173 }
174 }
175
176 /* This function must only be called when the TX is not busy. The UART
177 * port lock must be held and local interrupts disabled.
178 */
179 static int __load_zsregs(struct zilog_channel __iomem *channel, unsigned char *regs)
180 {
181 int i;
182 int escc;
183 unsigned char r15;
184
185 /* Let pending transmits finish. */
186 for (i = 0; i < 1000; i++) {
187 unsigned char stat = read_zsreg(channel, R1);
188 if (stat & ALL_SNT)
189 break;
190 udelay(100);
191 }
192
193 writeb(ERR_RES, &channel->control);
194 ZSDELAY();
195 ZS_WSYNC(channel);
196
197 sunzilog_clear_fifo(channel);
198
199 /* Disable all interrupts. */
200 write_zsreg(channel, R1,
201 regs[R1] & ~(RxINT_MASK | TxINT_ENAB | EXT_INT_ENAB));
202
203 /* Set parity, sync config, stop bits, and clock divisor. */
204 write_zsreg(channel, R4, regs[R4]);
205
206 /* Set misc. TX/RX control bits. */
207 write_zsreg(channel, R10, regs[R10]);
208
209 /* Set TX/RX controls sans the enable bits. */
210 write_zsreg(channel, R3, regs[R3] & ~RxENAB);
211 write_zsreg(channel, R5, regs[R5] & ~TxENAB);
212
213 /* Synchronous mode config. */
214 write_zsreg(channel, R6, regs[R6]);
215 write_zsreg(channel, R7, regs[R7]);
216
217 /* Don't mess with the interrupt vector (R2, unused by us) and
218 * master interrupt control (R9). We make sure this is setup
219 * properly at probe time then never touch it again.
220 */
221
222 /* Disable baud generator. */
223 write_zsreg(channel, R14, regs[R14] & ~BRENAB);
224
225 /* Clock mode control. */
226 write_zsreg(channel, R11, regs[R11]);
227
228 /* Lower and upper byte of baud rate generator divisor. */
229 write_zsreg(channel, R12, regs[R12]);
230 write_zsreg(channel, R13, regs[R13]);
231
232 /* Now rewrite R14, with BRENAB (if set). */
233 write_zsreg(channel, R14, regs[R14]);
234
235 /* External status interrupt control. */
236 write_zsreg(channel, R15, (regs[R15] | WR7pEN) & ~FIFOEN);
237
238 /* ESCC Extension Register */
239 r15 = read_zsreg(channel, R15);
240 if (r15 & 0x01) {
241 write_zsreg(channel, R7, regs[R7p]);
242
243 /* External status interrupt and FIFO control. */
244 write_zsreg(channel, R15, regs[R15] & ~WR7pEN);
245 escc = 1;
246 } else {
247 /* Clear FIFO bit case it is an issue */
248 regs[R15] &= ~FIFOEN;
249 escc = 0;
250 }
251
252 /* Reset external status interrupts. */
253 write_zsreg(channel, R0, RES_EXT_INT); /* First Latch */
254 write_zsreg(channel, R0, RES_EXT_INT); /* Second Latch */
255
256 /* Rewrite R3/R5, this time without enables masked. */
257 write_zsreg(channel, R3, regs[R3]);
258 write_zsreg(channel, R5, regs[R5]);
259
260 /* Rewrite R1, this time without IRQ enabled masked. */
261 write_zsreg(channel, R1, regs[R1]);
262
263 return escc;
264 }
265
266 /* Reprogram the Zilog channel HW registers with the copies found in the
267 * software state struct. If the transmitter is busy, we defer this update
268 * until the next TX complete interrupt. Else, we do it right now.
269 *
270 * The UART port lock must be held and local interrupts disabled.
271 */
272 static void sunzilog_maybe_update_regs(struct uart_sunzilog_port *up,
273 struct zilog_channel __iomem *channel)
274 {
275 if (!ZS_REGS_HELD(up)) {
276 if (ZS_TX_ACTIVE(up)) {
277 up->flags |= SUNZILOG_FLAG_REGS_HELD;
278 } else {
279 __load_zsregs(channel, up->curregs);
280 }
281 }
282 }
283
284 static void sunzilog_change_mouse_baud(struct uart_sunzilog_port *up)
285 {
286 unsigned int cur_cflag = up->cflag;
287 int brg, new_baud;
288
289 up->cflag &= ~CBAUD;
290 up->cflag |= suncore_mouse_baud_cflag_next(cur_cflag, &new_baud);
291
292 brg = BPS_TO_BRG(new_baud, ZS_CLOCK / ZS_CLOCK_DIVISOR);
293 up->curregs[R12] = (brg & 0xff);
294 up->curregs[R13] = (brg >> 8) & 0xff;
295 sunzilog_maybe_update_regs(up, ZILOG_CHANNEL_FROM_PORT(&up->port));
296 }
297
298 static void sunzilog_kbdms_receive_chars(struct uart_sunzilog_port *up,
299 unsigned char ch, int is_break)
300 {
301 if (ZS_IS_KEYB(up)) {
302 /* Stop-A is handled by drivers/char/keyboard.c now. */
303 #ifdef CONFIG_SERIO
304 if (up->serio_open)
305 serio_interrupt(&up->serio, ch, 0);
306 #endif
307 } else if (ZS_IS_MOUSE(up)) {
308 int ret = suncore_mouse_baud_detection(ch, is_break);
309
310 switch (ret) {
311 case 2:
312 sunzilog_change_mouse_baud(up);
313 /* fallthru */
314 case 1:
315 break;
316
317 case 0:
318 #ifdef CONFIG_SERIO
319 if (up->serio_open)
320 serio_interrupt(&up->serio, ch, 0);
321 #endif
322 break;
323 };
324 }
325 }
326
327 static struct tty_struct *
328 sunzilog_receive_chars(struct uart_sunzilog_port *up,
329 struct zilog_channel __iomem *channel)
330 {
331 struct tty_struct *tty;
332 unsigned char ch, r1, flag;
333
334 tty = NULL;
335 if (up->port.info != NULL && /* Unopened serial console */
336 up->port.info->tty != NULL) /* Keyboard || mouse */
337 tty = up->port.info->tty;
338
339 for (;;) {
340
341 r1 = read_zsreg(channel, R1);
342 if (r1 & (PAR_ERR | Rx_OVR | CRC_ERR)) {
343 writeb(ERR_RES, &channel->control);
344 ZSDELAY();
345 ZS_WSYNC(channel);
346 }
347
348 ch = readb(&channel->control);
349 ZSDELAY();
350
351 /* This funny hack depends upon BRK_ABRT not interfering
352 * with the other bits we care about in R1.
353 */
354 if (ch & BRK_ABRT)
355 r1 |= BRK_ABRT;
356
357 if (!(ch & Rx_CH_AV))
358 break;
359
360 ch = readb(&channel->data);
361 ZSDELAY();
362
363 ch &= up->parity_mask;
364
365 if (unlikely(ZS_IS_KEYB(up)) || unlikely(ZS_IS_MOUSE(up))) {
366 sunzilog_kbdms_receive_chars(up, ch, 0);
367 continue;
368 }
369
370 if (tty == NULL) {
371 uart_handle_sysrq_char(&up->port, ch);
372 continue;
373 }
374
375 /* A real serial line, record the character and status. */
376 flag = TTY_NORMAL;
377 up->port.icount.rx++;
378 if (r1 & (BRK_ABRT | PAR_ERR | Rx_OVR | CRC_ERR)) {
379 if (r1 & BRK_ABRT) {
380 r1 &= ~(PAR_ERR | CRC_ERR);
381 up->port.icount.brk++;
382 if (uart_handle_break(&up->port))
383 continue;
384 }
385 else if (r1 & PAR_ERR)
386 up->port.icount.parity++;
387 else if (r1 & CRC_ERR)
388 up->port.icount.frame++;
389 if (r1 & Rx_OVR)
390 up->port.icount.overrun++;
391 r1 &= up->port.read_status_mask;
392 if (r1 & BRK_ABRT)
393 flag = TTY_BREAK;
394 else if (r1 & PAR_ERR)
395 flag = TTY_PARITY;
396 else if (r1 & CRC_ERR)
397 flag = TTY_FRAME;
398 }
399 if (uart_handle_sysrq_char(&up->port, ch))
400 continue;
401
402 if (up->port.ignore_status_mask == 0xff ||
403 (r1 & up->port.ignore_status_mask) == 0) {
404 tty_insert_flip_char(tty, ch, flag);
405 }
406 if (r1 & Rx_OVR)
407 tty_insert_flip_char(tty, 0, TTY_OVERRUN);
408 }
409
410 return tty;
411 }
412
413 static void sunzilog_status_handle(struct uart_sunzilog_port *up,
414 struct zilog_channel __iomem *channel)
415 {
416 unsigned char status;
417
418 status = readb(&channel->control);
419 ZSDELAY();
420
421 writeb(RES_EXT_INT, &channel->control);
422 ZSDELAY();
423 ZS_WSYNC(channel);
424
425 if (status & BRK_ABRT) {
426 if (ZS_IS_MOUSE(up))
427 sunzilog_kbdms_receive_chars(up, 0, 1);
428 if (ZS_IS_CONS(up)) {
429 /* Wait for BREAK to deassert to avoid potentially
430 * confusing the PROM.
431 */
432 while (1) {
433 status = readb(&channel->control);
434 ZSDELAY();
435 if (!(status & BRK_ABRT))
436 break;
437 }
438 sun_do_break();
439 return;
440 }
441 }
442
443 if (ZS_WANTS_MODEM_STATUS(up)) {
444 if (status & SYNC)
445 up->port.icount.dsr++;
446
447 /* The Zilog just gives us an interrupt when DCD/CTS/etc. change.
448 * But it does not tell us which bit has changed, we have to keep
449 * track of this ourselves.
450 */
451 if ((status ^ up->prev_status) ^ DCD)
452 uart_handle_dcd_change(&up->port,
453 (status & DCD));
454 if ((status ^ up->prev_status) ^ CTS)
455 uart_handle_cts_change(&up->port,
456 (status & CTS));
457
458 wake_up_interruptible(&up->port.info->delta_msr_wait);
459 }
460
461 up->prev_status = status;
462 }
463
464 static void sunzilog_transmit_chars(struct uart_sunzilog_port *up,
465 struct zilog_channel __iomem *channel)
466 {
467 struct circ_buf *xmit;
468
469 if (ZS_IS_CONS(up)) {
470 unsigned char status = readb(&channel->control);
471 ZSDELAY();
472
473 /* TX still busy? Just wait for the next TX done interrupt.
474 *
475 * It can occur because of how we do serial console writes. It would
476 * be nice to transmit console writes just like we normally would for
477 * a TTY line. (ie. buffered and TX interrupt driven). That is not
478 * easy because console writes cannot sleep. One solution might be
479 * to poll on enough port->xmit space becomming free. -DaveM
480 */
481 if (!(status & Tx_BUF_EMP))
482 return;
483 }
484
485 up->flags &= ~SUNZILOG_FLAG_TX_ACTIVE;
486
487 if (ZS_REGS_HELD(up)) {
488 __load_zsregs(channel, up->curregs);
489 up->flags &= ~SUNZILOG_FLAG_REGS_HELD;
490 }
491
492 if (ZS_TX_STOPPED(up)) {
493 up->flags &= ~SUNZILOG_FLAG_TX_STOPPED;
494 goto ack_tx_int;
495 }
496
497 if (up->port.x_char) {
498 up->flags |= SUNZILOG_FLAG_TX_ACTIVE;
499 writeb(up->port.x_char, &channel->data);
500 ZSDELAY();
501 ZS_WSYNC(channel);
502
503 up->port.icount.tx++;
504 up->port.x_char = 0;
505 return;
506 }
507
508 if (up->port.info == NULL)
509 goto ack_tx_int;
510 xmit = &up->port.info->xmit;
511 if (uart_circ_empty(xmit))
512 goto ack_tx_int;
513
514 if (uart_tx_stopped(&up->port))
515 goto ack_tx_int;
516
517 up->flags |= SUNZILOG_FLAG_TX_ACTIVE;
518 writeb(xmit->buf[xmit->tail], &channel->data);
519 ZSDELAY();
520 ZS_WSYNC(channel);
521
522 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
523 up->port.icount.tx++;
524
525 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
526 uart_write_wakeup(&up->port);
527
528 return;
529
530 ack_tx_int:
531 writeb(RES_Tx_P, &channel->control);
532 ZSDELAY();
533 ZS_WSYNC(channel);
534 }
535
536 static irqreturn_t sunzilog_interrupt(int irq, void *dev_id)
537 {
538 struct uart_sunzilog_port *up = dev_id;
539
540 while (up) {
541 struct zilog_channel __iomem *channel
542 = ZILOG_CHANNEL_FROM_PORT(&up->port);
543 struct tty_struct *tty;
544 unsigned char r3;
545
546 spin_lock(&up->port.lock);
547 r3 = read_zsreg(channel, R3);
548
549 /* Channel A */
550 tty = NULL;
551 if (r3 & (CHAEXT | CHATxIP | CHARxIP)) {
552 writeb(RES_H_IUS, &channel->control);
553 ZSDELAY();
554 ZS_WSYNC(channel);
555
556 if (r3 & CHARxIP)
557 tty = sunzilog_receive_chars(up, channel);
558 if (r3 & CHAEXT)
559 sunzilog_status_handle(up, channel);
560 if (r3 & CHATxIP)
561 sunzilog_transmit_chars(up, channel);
562 }
563 spin_unlock(&up->port.lock);
564
565 if (tty)
566 tty_flip_buffer_push(tty);
567
568 /* Channel B */
569 up = up->next;
570 channel = ZILOG_CHANNEL_FROM_PORT(&up->port);
571
572 spin_lock(&up->port.lock);
573 tty = NULL;
574 if (r3 & (CHBEXT | CHBTxIP | CHBRxIP)) {
575 writeb(RES_H_IUS, &channel->control);
576 ZSDELAY();
577 ZS_WSYNC(channel);
578
579 if (r3 & CHBRxIP)
580 tty = sunzilog_receive_chars(up, channel);
581 if (r3 & CHBEXT)
582 sunzilog_status_handle(up, channel);
583 if (r3 & CHBTxIP)
584 sunzilog_transmit_chars(up, channel);
585 }
586 spin_unlock(&up->port.lock);
587
588 if (tty)
589 tty_flip_buffer_push(tty);
590
591 up = up->next;
592 }
593
594 return IRQ_HANDLED;
595 }
596
597 /* A convenient way to quickly get R0 status. The caller must _not_ hold the
598 * port lock, it is acquired here.
599 */
600 static __inline__ unsigned char sunzilog_read_channel_status(struct uart_port *port)
601 {
602 struct zilog_channel __iomem *channel;
603 unsigned char status;
604
605 channel = ZILOG_CHANNEL_FROM_PORT(port);
606 status = readb(&channel->control);
607 ZSDELAY();
608
609 return status;
610 }
611
612 /* The port lock is not held. */
613 static unsigned int sunzilog_tx_empty(struct uart_port *port)
614 {
615 unsigned long flags;
616 unsigned char status;
617 unsigned int ret;
618
619 spin_lock_irqsave(&port->lock, flags);
620
621 status = sunzilog_read_channel_status(port);
622
623 spin_unlock_irqrestore(&port->lock, flags);
624
625 if (status & Tx_BUF_EMP)
626 ret = TIOCSER_TEMT;
627 else
628 ret = 0;
629
630 return ret;
631 }
632
633 /* The port lock is held and interrupts are disabled. */
634 static unsigned int sunzilog_get_mctrl(struct uart_port *port)
635 {
636 unsigned char status;
637 unsigned int ret;
638
639 status = sunzilog_read_channel_status(port);
640
641 ret = 0;
642 if (status & DCD)
643 ret |= TIOCM_CAR;
644 if (status & SYNC)
645 ret |= TIOCM_DSR;
646 if (status & CTS)
647 ret |= TIOCM_CTS;
648
649 return ret;
650 }
651
652 /* The port lock is held and interrupts are disabled. */
653 static void sunzilog_set_mctrl(struct uart_port *port, unsigned int mctrl)
654 {
655 struct uart_sunzilog_port *up = (struct uart_sunzilog_port *) port;
656 struct zilog_channel __iomem *channel = ZILOG_CHANNEL_FROM_PORT(port);
657 unsigned char set_bits, clear_bits;
658
659 set_bits = clear_bits = 0;
660
661 if (mctrl & TIOCM_RTS)
662 set_bits |= RTS;
663 else
664 clear_bits |= RTS;
665 if (mctrl & TIOCM_DTR)
666 set_bits |= DTR;
667 else
668 clear_bits |= DTR;
669
670 /* NOTE: Not subject to 'transmitter active' rule. */
671 up->curregs[R5] |= set_bits;
672 up->curregs[R5] &= ~clear_bits;
673 write_zsreg(channel, R5, up->curregs[R5]);
674 }
675
676 /* The port lock is held and interrupts are disabled. */
677 static void sunzilog_stop_tx(struct uart_port *port)
678 {
679 struct uart_sunzilog_port *up = (struct uart_sunzilog_port *) port;
680
681 up->flags |= SUNZILOG_FLAG_TX_STOPPED;
682 }
683
684 /* The port lock is held and interrupts are disabled. */
685 static void sunzilog_start_tx(struct uart_port *port)
686 {
687 struct uart_sunzilog_port *up = (struct uart_sunzilog_port *) port;
688 struct zilog_channel __iomem *channel = ZILOG_CHANNEL_FROM_PORT(port);
689 unsigned char status;
690
691 up->flags |= SUNZILOG_FLAG_TX_ACTIVE;
692 up->flags &= ~SUNZILOG_FLAG_TX_STOPPED;
693
694 status = readb(&channel->control);
695 ZSDELAY();
696
697 /* TX busy? Just wait for the TX done interrupt. */
698 if (!(status & Tx_BUF_EMP))
699 return;
700
701 /* Send the first character to jump-start the TX done
702 * IRQ sending engine.
703 */
704 if (port->x_char) {
705 writeb(port->x_char, &channel->data);
706 ZSDELAY();
707 ZS_WSYNC(channel);
708
709 port->icount.tx++;
710 port->x_char = 0;
711 } else {
712 struct circ_buf *xmit = &port->info->xmit;
713
714 writeb(xmit->buf[xmit->tail], &channel->data);
715 ZSDELAY();
716 ZS_WSYNC(channel);
717
718 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
719 port->icount.tx++;
720
721 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
722 uart_write_wakeup(&up->port);
723 }
724 }
725
726 /* The port lock is held. */
727 static void sunzilog_stop_rx(struct uart_port *port)
728 {
729 struct uart_sunzilog_port *up = UART_ZILOG(port);
730 struct zilog_channel __iomem *channel;
731
732 if (ZS_IS_CONS(up))
733 return;
734
735 channel = ZILOG_CHANNEL_FROM_PORT(port);
736
737 /* Disable all RX interrupts. */
738 up->curregs[R1] &= ~RxINT_MASK;
739 sunzilog_maybe_update_regs(up, channel);
740 }
741
742 /* The port lock is held. */
743 static void sunzilog_enable_ms(struct uart_port *port)
744 {
745 struct uart_sunzilog_port *up = (struct uart_sunzilog_port *) port;
746 struct zilog_channel __iomem *channel = ZILOG_CHANNEL_FROM_PORT(port);
747 unsigned char new_reg;
748
749 new_reg = up->curregs[R15] | (DCDIE | SYNCIE | CTSIE);
750 if (new_reg != up->curregs[R15]) {
751 up->curregs[R15] = new_reg;
752
753 /* NOTE: Not subject to 'transmitter active' rule. */
754 write_zsreg(channel, R15, up->curregs[R15] & ~WR7pEN);
755 }
756 }
757
758 /* The port lock is not held. */
759 static void sunzilog_break_ctl(struct uart_port *port, int break_state)
760 {
761 struct uart_sunzilog_port *up = (struct uart_sunzilog_port *) port;
762 struct zilog_channel __iomem *channel = ZILOG_CHANNEL_FROM_PORT(port);
763 unsigned char set_bits, clear_bits, new_reg;
764 unsigned long flags;
765
766 set_bits = clear_bits = 0;
767
768 if (break_state)
769 set_bits |= SND_BRK;
770 else
771 clear_bits |= SND_BRK;
772
773 spin_lock_irqsave(&port->lock, flags);
774
775 new_reg = (up->curregs[R5] | set_bits) & ~clear_bits;
776 if (new_reg != up->curregs[R5]) {
777 up->curregs[R5] = new_reg;
778
779 /* NOTE: Not subject to 'transmitter active' rule. */
780 write_zsreg(channel, R5, up->curregs[R5]);
781 }
782
783 spin_unlock_irqrestore(&port->lock, flags);
784 }
785
786 static void __sunzilog_startup(struct uart_sunzilog_port *up)
787 {
788 struct zilog_channel __iomem *channel;
789
790 channel = ZILOG_CHANNEL_FROM_PORT(&up->port);
791 up->prev_status = readb(&channel->control);
792
793 /* Enable receiver and transmitter. */
794 up->curregs[R3] |= RxENAB;
795 up->curregs[R5] |= TxENAB;
796
797 up->curregs[R1] |= EXT_INT_ENAB | INT_ALL_Rx | TxINT_ENAB;
798 sunzilog_maybe_update_regs(up, channel);
799 }
800
801 static int sunzilog_startup(struct uart_port *port)
802 {
803 struct uart_sunzilog_port *up = UART_ZILOG(port);
804 unsigned long flags;
805
806 if (ZS_IS_CONS(up))
807 return 0;
808
809 spin_lock_irqsave(&port->lock, flags);
810 __sunzilog_startup(up);
811 spin_unlock_irqrestore(&port->lock, flags);
812 return 0;
813 }
814
815 /*
816 * The test for ZS_IS_CONS is explained by the following e-mail:
817 *****
818 * From: Russell King <rmk@arm.linux.org.uk>
819 * Date: Sun, 8 Dec 2002 10:18:38 +0000
820 *
821 * On Sun, Dec 08, 2002 at 02:43:36AM -0500, Pete Zaitcev wrote:
822 * > I boot my 2.5 boxes using "console=ttyS0,9600" argument,
823 * > and I noticed that something is not right with reference
824 * > counting in this case. It seems that when the console
825 * > is open by kernel initially, this is not accounted
826 * > as an open, and uart_startup is not called.
827 *
828 * That is correct. We are unable to call uart_startup when the serial
829 * console is initialised because it may need to allocate memory (as
830 * request_irq does) and the memory allocators may not have been
831 * initialised.
832 *
833 * 1. initialise the port into a state where it can send characters in the
834 * console write method.
835 *
836 * 2. don't do the actual hardware shutdown in your shutdown() method (but
837 * do the normal software shutdown - ie, free irqs etc)
838 *****
839 */
840 static void sunzilog_shutdown(struct uart_port *port)
841 {
842 struct uart_sunzilog_port *up = UART_ZILOG(port);
843 struct zilog_channel __iomem *channel;
844 unsigned long flags;
845
846 if (ZS_IS_CONS(up))
847 return;
848
849 spin_lock_irqsave(&port->lock, flags);
850
851 channel = ZILOG_CHANNEL_FROM_PORT(port);
852
853 /* Disable receiver and transmitter. */
854 up->curregs[R3] &= ~RxENAB;
855 up->curregs[R5] &= ~TxENAB;
856
857 /* Disable all interrupts and BRK assertion. */
858 up->curregs[R1] &= ~(EXT_INT_ENAB | TxINT_ENAB | RxINT_MASK);
859 up->curregs[R5] &= ~SND_BRK;
860 sunzilog_maybe_update_regs(up, channel);
861
862 spin_unlock_irqrestore(&port->lock, flags);
863 }
864
865 /* Shared by TTY driver and serial console setup. The port lock is held
866 * and local interrupts are disabled.
867 */
868 static void
869 sunzilog_convert_to_zs(struct uart_sunzilog_port *up, unsigned int cflag,
870 unsigned int iflag, int brg)
871 {
872
873 up->curregs[R10] = NRZ;
874 up->curregs[R11] = TCBR | RCBR;
875
876 /* Program BAUD and clock source. */
877 up->curregs[R4] &= ~XCLK_MASK;
878 up->curregs[R4] |= X16CLK;
879 up->curregs[R12] = brg & 0xff;
880 up->curregs[R13] = (brg >> 8) & 0xff;
881 up->curregs[R14] = BRSRC | BRENAB;
882
883 /* Character size, stop bits, and parity. */
884 up->curregs[R3] &= ~RxN_MASK;
885 up->curregs[R5] &= ~TxN_MASK;
886 switch (cflag & CSIZE) {
887 case CS5:
888 up->curregs[R3] |= Rx5;
889 up->curregs[R5] |= Tx5;
890 up->parity_mask = 0x1f;
891 break;
892 case CS6:
893 up->curregs[R3] |= Rx6;
894 up->curregs[R5] |= Tx6;
895 up->parity_mask = 0x3f;
896 break;
897 case CS7:
898 up->curregs[R3] |= Rx7;
899 up->curregs[R5] |= Tx7;
900 up->parity_mask = 0x7f;
901 break;
902 case CS8:
903 default:
904 up->curregs[R3] |= Rx8;
905 up->curregs[R5] |= Tx8;
906 up->parity_mask = 0xff;
907 break;
908 };
909 up->curregs[R4] &= ~0x0c;
910 if (cflag & CSTOPB)
911 up->curregs[R4] |= SB2;
912 else
913 up->curregs[R4] |= SB1;
914 if (cflag & PARENB)
915 up->curregs[R4] |= PAR_ENAB;
916 else
917 up->curregs[R4] &= ~PAR_ENAB;
918 if (!(cflag & PARODD))
919 up->curregs[R4] |= PAR_EVEN;
920 else
921 up->curregs[R4] &= ~PAR_EVEN;
922
923 up->port.read_status_mask = Rx_OVR;
924 if (iflag & INPCK)
925 up->port.read_status_mask |= CRC_ERR | PAR_ERR;
926 if (iflag & (BRKINT | PARMRK))
927 up->port.read_status_mask |= BRK_ABRT;
928
929 up->port.ignore_status_mask = 0;
930 if (iflag & IGNPAR)
931 up->port.ignore_status_mask |= CRC_ERR | PAR_ERR;
932 if (iflag & IGNBRK) {
933 up->port.ignore_status_mask |= BRK_ABRT;
934 if (iflag & IGNPAR)
935 up->port.ignore_status_mask |= Rx_OVR;
936 }
937
938 if ((cflag & CREAD) == 0)
939 up->port.ignore_status_mask = 0xff;
940 }
941
942 /* The port lock is not held. */
943 static void
944 sunzilog_set_termios(struct uart_port *port, struct ktermios *termios,
945 struct ktermios *old)
946 {
947 struct uart_sunzilog_port *up = (struct uart_sunzilog_port *) port;
948 unsigned long flags;
949 int baud, brg;
950
951 baud = uart_get_baud_rate(port, termios, old, 1200, 76800);
952
953 spin_lock_irqsave(&up->port.lock, flags);
954
955 brg = BPS_TO_BRG(baud, ZS_CLOCK / ZS_CLOCK_DIVISOR);
956
957 sunzilog_convert_to_zs(up, termios->c_cflag, termios->c_iflag, brg);
958
959 if (UART_ENABLE_MS(&up->port, termios->c_cflag))
960 up->flags |= SUNZILOG_FLAG_MODEM_STATUS;
961 else
962 up->flags &= ~SUNZILOG_FLAG_MODEM_STATUS;
963
964 up->cflag = termios->c_cflag;
965
966 sunzilog_maybe_update_regs(up, ZILOG_CHANNEL_FROM_PORT(port));
967
968 uart_update_timeout(port, termios->c_cflag, baud);
969
970 spin_unlock_irqrestore(&up->port.lock, flags);
971 }
972
973 static const char *sunzilog_type(struct uart_port *port)
974 {
975 struct uart_sunzilog_port *up = UART_ZILOG(port);
976
977 return (up->flags & SUNZILOG_FLAG_ESCC) ? "zs (ESCC)" : "zs";
978 }
979
980 /* We do not request/release mappings of the registers here, this
981 * happens at early serial probe time.
982 */
983 static void sunzilog_release_port(struct uart_port *port)
984 {
985 }
986
987 static int sunzilog_request_port(struct uart_port *port)
988 {
989 return 0;
990 }
991
992 /* These do not need to do anything interesting either. */
993 static void sunzilog_config_port(struct uart_port *port, int flags)
994 {
995 }
996
997 /* We do not support letting the user mess with the divisor, IRQ, etc. */
998 static int sunzilog_verify_port(struct uart_port *port, struct serial_struct *ser)
999 {
1000 return -EINVAL;
1001 }
1002
1003 static struct uart_ops sunzilog_pops = {
1004 .tx_empty = sunzilog_tx_empty,
1005 .set_mctrl = sunzilog_set_mctrl,
1006 .get_mctrl = sunzilog_get_mctrl,
1007 .stop_tx = sunzilog_stop_tx,
1008 .start_tx = sunzilog_start_tx,
1009 .stop_rx = sunzilog_stop_rx,
1010 .enable_ms = sunzilog_enable_ms,
1011 .break_ctl = sunzilog_break_ctl,
1012 .startup = sunzilog_startup,
1013 .shutdown = sunzilog_shutdown,
1014 .set_termios = sunzilog_set_termios,
1015 .type = sunzilog_type,
1016 .release_port = sunzilog_release_port,
1017 .request_port = sunzilog_request_port,
1018 .config_port = sunzilog_config_port,
1019 .verify_port = sunzilog_verify_port,
1020 };
1021
1022 static struct uart_sunzilog_port *sunzilog_port_table;
1023 static struct zilog_layout __iomem **sunzilog_chip_regs;
1024
1025 static struct uart_sunzilog_port *sunzilog_irq_chain;
1026
1027 static struct uart_driver sunzilog_reg = {
1028 .owner = THIS_MODULE,
1029 .driver_name = "ttyS",
1030 .dev_name = "ttyS",
1031 .major = TTY_MAJOR,
1032 };
1033
1034 static int __init sunzilog_alloc_tables(void)
1035 {
1036 struct uart_sunzilog_port *up;
1037 unsigned long size;
1038 int i;
1039
1040 size = NUM_CHANNELS * sizeof(struct uart_sunzilog_port);
1041 sunzilog_port_table = kzalloc(size, GFP_KERNEL);
1042 if (!sunzilog_port_table)
1043 return -ENOMEM;
1044
1045 for (i = 0; i < NUM_CHANNELS; i++) {
1046 up = &sunzilog_port_table[i];
1047
1048 spin_lock_init(&up->port.lock);
1049
1050 if (i == 0)
1051 sunzilog_irq_chain = up;
1052
1053 if (i < NUM_CHANNELS - 1)
1054 up->next = up + 1;
1055 else
1056 up->next = NULL;
1057 }
1058
1059 size = NUM_SUNZILOG * sizeof(struct zilog_layout __iomem *);
1060 sunzilog_chip_regs = kzalloc(size, GFP_KERNEL);
1061 if (!sunzilog_chip_regs) {
1062 kfree(sunzilog_port_table);
1063 sunzilog_irq_chain = NULL;
1064 return -ENOMEM;
1065 }
1066
1067 return 0;
1068 }
1069
1070 static void sunzilog_free_tables(void)
1071 {
1072 kfree(sunzilog_port_table);
1073 sunzilog_irq_chain = NULL;
1074 kfree(sunzilog_chip_regs);
1075 }
1076
1077 #define ZS_PUT_CHAR_MAX_DELAY 2000 /* 10 ms */
1078
1079 static void sunzilog_putchar(struct uart_port *port, int ch)
1080 {
1081 struct zilog_channel __iomem *channel = ZILOG_CHANNEL_FROM_PORT(port);
1082 int loops = ZS_PUT_CHAR_MAX_DELAY;
1083
1084 /* This is a timed polling loop so do not switch the explicit
1085 * udelay with ZSDELAY as that is a NOP on some platforms. -DaveM
1086 */
1087 do {
1088 unsigned char val = readb(&channel->control);
1089 if (val & Tx_BUF_EMP) {
1090 ZSDELAY();
1091 break;
1092 }
1093 udelay(5);
1094 } while (--loops);
1095
1096 writeb(ch, &channel->data);
1097 ZSDELAY();
1098 ZS_WSYNC(channel);
1099 }
1100
1101 #ifdef CONFIG_SERIO
1102
1103 static DEFINE_SPINLOCK(sunzilog_serio_lock);
1104
1105 static int sunzilog_serio_write(struct serio *serio, unsigned char ch)
1106 {
1107 struct uart_sunzilog_port *up = serio->port_data;
1108 unsigned long flags;
1109
1110 spin_lock_irqsave(&sunzilog_serio_lock, flags);
1111
1112 sunzilog_putchar(&up->port, ch);
1113
1114 spin_unlock_irqrestore(&sunzilog_serio_lock, flags);
1115
1116 return 0;
1117 }
1118
1119 static int sunzilog_serio_open(struct serio *serio)
1120 {
1121 struct uart_sunzilog_port *up = serio->port_data;
1122 unsigned long flags;
1123 int ret;
1124
1125 spin_lock_irqsave(&sunzilog_serio_lock, flags);
1126 if (!up->serio_open) {
1127 up->serio_open = 1;
1128 ret = 0;
1129 } else
1130 ret = -EBUSY;
1131 spin_unlock_irqrestore(&sunzilog_serio_lock, flags);
1132
1133 return ret;
1134 }
1135
1136 static void sunzilog_serio_close(struct serio *serio)
1137 {
1138 struct uart_sunzilog_port *up = serio->port_data;
1139 unsigned long flags;
1140
1141 spin_lock_irqsave(&sunzilog_serio_lock, flags);
1142 up->serio_open = 0;
1143 spin_unlock_irqrestore(&sunzilog_serio_lock, flags);
1144 }
1145
1146 #endif /* CONFIG_SERIO */
1147
1148 #ifdef CONFIG_SERIAL_SUNZILOG_CONSOLE
1149 static void
1150 sunzilog_console_write(struct console *con, const char *s, unsigned int count)
1151 {
1152 struct uart_sunzilog_port *up = &sunzilog_port_table[con->index];
1153 unsigned long flags;
1154 int locked = 1;
1155
1156 local_irq_save(flags);
1157 if (up->port.sysrq) {
1158 locked = 0;
1159 } else if (oops_in_progress) {
1160 locked = spin_trylock(&up->port.lock);
1161 } else
1162 spin_lock(&up->port.lock);
1163
1164 uart_console_write(&up->port, s, count, sunzilog_putchar);
1165 udelay(2);
1166
1167 if (locked)
1168 spin_unlock(&up->port.lock);
1169 local_irq_restore(flags);
1170 }
1171
1172 static int __init sunzilog_console_setup(struct console *con, char *options)
1173 {
1174 struct uart_sunzilog_port *up = &sunzilog_port_table[con->index];
1175 unsigned long flags;
1176 int baud, brg;
1177
1178 if (up->port.type != PORT_SUNZILOG)
1179 return -1;
1180
1181 printk(KERN_INFO "Console: ttyS%d (SunZilog zs%d)\n",
1182 (sunzilog_reg.minor - 64) + con->index, con->index);
1183
1184 /* Get firmware console settings. */
1185 sunserial_console_termios(con);
1186
1187 /* Firmware console speed is limited to 150-->38400 baud so
1188 * this hackish cflag thing is OK.
1189 */
1190 switch (con->cflag & CBAUD) {
1191 case B150: baud = 150; break;
1192 case B300: baud = 300; break;
1193 case B600: baud = 600; break;
1194 case B1200: baud = 1200; break;
1195 case B2400: baud = 2400; break;
1196 case B4800: baud = 4800; break;
1197 default: case B9600: baud = 9600; break;
1198 case B19200: baud = 19200; break;
1199 case B38400: baud = 38400; break;
1200 };
1201
1202 brg = BPS_TO_BRG(baud, ZS_CLOCK / ZS_CLOCK_DIVISOR);
1203
1204 spin_lock_irqsave(&up->port.lock, flags);
1205
1206 up->curregs[R15] |= BRKIE;
1207 sunzilog_convert_to_zs(up, con->cflag, 0, brg);
1208
1209 sunzilog_set_mctrl(&up->port, TIOCM_DTR | TIOCM_RTS);
1210 __sunzilog_startup(up);
1211
1212 spin_unlock_irqrestore(&up->port.lock, flags);
1213
1214 return 0;
1215 }
1216
1217 static struct console sunzilog_console_ops = {
1218 .name = "ttyS",
1219 .write = sunzilog_console_write,
1220 .device = uart_console_device,
1221 .setup = sunzilog_console_setup,
1222 .flags = CON_PRINTBUFFER,
1223 .index = -1,
1224 .data = &sunzilog_reg,
1225 };
1226
1227 static inline struct console *SUNZILOG_CONSOLE(void)
1228 {
1229 int i;
1230
1231 if (con_is_present())
1232 return NULL;
1233
1234 for (i = 0; i < NUM_CHANNELS; i++) {
1235 int this_minor = sunzilog_reg.minor + i;
1236
1237 if ((this_minor - 64) == (serial_console - 1))
1238 break;
1239 }
1240 if (i == NUM_CHANNELS)
1241 return NULL;
1242
1243 sunzilog_console_ops.index = i;
1244 sunzilog_port_table[i].flags |= SUNZILOG_FLAG_IS_CONS;
1245
1246 return &sunzilog_console_ops;
1247 }
1248
1249 #else
1250 #define SUNZILOG_CONSOLE() (NULL)
1251 #endif
1252
1253 static void __devinit sunzilog_init_kbdms(struct uart_sunzilog_port *up, int channel)
1254 {
1255 int baud, brg;
1256
1257 if (up->flags & SUNZILOG_FLAG_CONS_KEYB) {
1258 up->cflag = B1200 | CS8 | CLOCAL | CREAD;
1259 baud = 1200;
1260 } else {
1261 up->cflag = B4800 | CS8 | CLOCAL | CREAD;
1262 baud = 4800;
1263 }
1264
1265 up->curregs[R15] |= BRKIE;
1266 brg = BPS_TO_BRG(baud, ZS_CLOCK / ZS_CLOCK_DIVISOR);
1267 sunzilog_convert_to_zs(up, up->cflag, 0, brg);
1268 sunzilog_set_mctrl(&up->port, TIOCM_DTR | TIOCM_RTS);
1269 __sunzilog_startup(up);
1270 }
1271
1272 #ifdef CONFIG_SERIO
1273 static void __devinit sunzilog_register_serio(struct uart_sunzilog_port *up)
1274 {
1275 struct serio *serio = &up->serio;
1276
1277 serio->port_data = up;
1278
1279 serio->id.type = SERIO_RS232;
1280 if (up->flags & SUNZILOG_FLAG_CONS_KEYB) {
1281 serio->id.proto = SERIO_SUNKBD;
1282 strlcpy(serio->name, "zskbd", sizeof(serio->name));
1283 } else {
1284 serio->id.proto = SERIO_SUN;
1285 serio->id.extra = 1;
1286 strlcpy(serio->name, "zsms", sizeof(serio->name));
1287 }
1288 strlcpy(serio->phys,
1289 ((up->flags & SUNZILOG_FLAG_CONS_KEYB) ?
1290 "zs/serio0" : "zs/serio1"),
1291 sizeof(serio->phys));
1292
1293 serio->write = sunzilog_serio_write;
1294 serio->open = sunzilog_serio_open;
1295 serio->close = sunzilog_serio_close;
1296 serio->dev.parent = up->port.dev;
1297
1298 serio_register_port(serio);
1299 }
1300 #endif
1301
1302 static void __devinit sunzilog_init_hw(struct uart_sunzilog_port *up)
1303 {
1304 struct zilog_channel __iomem *channel;
1305 unsigned long flags;
1306 int baud, brg;
1307
1308 channel = ZILOG_CHANNEL_FROM_PORT(&up->port);
1309
1310 spin_lock_irqsave(&up->port.lock, flags);
1311 if (ZS_IS_CHANNEL_A(up)) {
1312 write_zsreg(channel, R9, FHWRES);
1313 ZSDELAY_LONG();
1314 (void) read_zsreg(channel, R0);
1315 }
1316
1317 if (up->flags & (SUNZILOG_FLAG_CONS_KEYB |
1318 SUNZILOG_FLAG_CONS_MOUSE)) {
1319 up->curregs[R1] = EXT_INT_ENAB | INT_ALL_Rx | TxINT_ENAB;
1320 up->curregs[R4] = PAR_EVEN | X16CLK | SB1;
1321 up->curregs[R3] = RxENAB | Rx8;
1322 up->curregs[R5] = TxENAB | Tx8;
1323 up->curregs[R6] = 0x00; /* SDLC Address */
1324 up->curregs[R7] = 0x7E; /* SDLC Flag */
1325 up->curregs[R9] = NV;
1326 up->curregs[R7p] = 0x00;
1327 sunzilog_init_kbdms(up, up->port.line);
1328 /* Only enable interrupts if an ISR handler available */
1329 if (up->flags & SUNZILOG_FLAG_ISR_HANDLER)
1330 up->curregs[R9] |= MIE;
1331 write_zsreg(channel, R9, up->curregs[R9]);
1332 } else {
1333 /* Normal serial TTY. */
1334 up->parity_mask = 0xff;
1335 up->curregs[R1] = EXT_INT_ENAB | INT_ALL_Rx | TxINT_ENAB;
1336 up->curregs[R4] = PAR_EVEN | X16CLK | SB1;
1337 up->curregs[R3] = RxENAB | Rx8;
1338 up->curregs[R5] = TxENAB | Tx8;
1339 up->curregs[R6] = 0x00; /* SDLC Address */
1340 up->curregs[R7] = 0x7E; /* SDLC Flag */
1341 up->curregs[R9] = NV;
1342 up->curregs[R10] = NRZ;
1343 up->curregs[R11] = TCBR | RCBR;
1344 baud = 9600;
1345 brg = BPS_TO_BRG(baud, ZS_CLOCK / ZS_CLOCK_DIVISOR);
1346 up->curregs[R12] = (brg & 0xff);
1347 up->curregs[R13] = (brg >> 8) & 0xff;
1348 up->curregs[R14] = BRSRC | BRENAB;
1349 up->curregs[R15] = FIFOEN; /* Use FIFO if on ESCC */
1350 up->curregs[R7p] = TxFIFO_LVL | RxFIFO_LVL;
1351 if (__load_zsregs(channel, up->curregs)) {
1352 up->flags |= SUNZILOG_FLAG_ESCC;
1353 }
1354 /* Only enable interrupts if an ISR handler available */
1355 if (up->flags & SUNZILOG_FLAG_ISR_HANDLER)
1356 up->curregs[R9] |= MIE;
1357 write_zsreg(channel, R9, up->curregs[R9]);
1358 }
1359
1360 spin_unlock_irqrestore(&up->port.lock, flags);
1361
1362 #ifdef CONFIG_SERIO
1363 if (up->flags & (SUNZILOG_FLAG_CONS_KEYB |
1364 SUNZILOG_FLAG_CONS_MOUSE))
1365 sunzilog_register_serio(up);
1366 #endif
1367 }
1368
1369 static int zilog_irq = -1;
1370
1371 static int __devinit zs_probe(struct of_device *op, const struct of_device_id *match)
1372 {
1373 static int inst;
1374 struct uart_sunzilog_port *up;
1375 struct zilog_layout __iomem *rp;
1376 int keyboard_mouse;
1377 int err;
1378
1379 keyboard_mouse = 0;
1380 if (of_find_property(op->node, "keyboard", NULL))
1381 keyboard_mouse = 1;
1382
1383 sunzilog_chip_regs[inst] = of_ioremap(&op->resource[0], 0,
1384 sizeof(struct zilog_layout),
1385 "zs");
1386 if (!sunzilog_chip_regs[inst])
1387 return -ENOMEM;
1388
1389 rp = sunzilog_chip_regs[inst];
1390
1391 if (zilog_irq == -1)
1392 zilog_irq = op->irqs[0];
1393
1394 up = &sunzilog_port_table[inst * 2];
1395
1396 /* Channel A */
1397 up[0].port.mapbase = op->resource[0].start + 0x00;
1398 up[0].port.membase = (void __iomem *) &rp->channelA;
1399 up[0].port.iotype = UPIO_MEM;
1400 up[0].port.irq = op->irqs[0];
1401 up[0].port.uartclk = ZS_CLOCK;
1402 up[0].port.fifosize = 1;
1403 up[0].port.ops = &sunzilog_pops;
1404 up[0].port.type = PORT_SUNZILOG;
1405 up[0].port.flags = 0;
1406 up[0].port.line = (inst * 2) + 0;
1407 up[0].port.dev = &op->dev;
1408 up[0].flags |= SUNZILOG_FLAG_IS_CHANNEL_A;
1409 if (keyboard_mouse)
1410 up[0].flags |= SUNZILOG_FLAG_CONS_KEYB;
1411 sunzilog_init_hw(&up[0]);
1412
1413 /* Channel B */
1414 up[1].port.mapbase = op->resource[0].start + 0x04;
1415 up[1].port.membase = (void __iomem *) &rp->channelB;
1416 up[1].port.iotype = UPIO_MEM;
1417 up[1].port.irq = op->irqs[0];
1418 up[1].port.uartclk = ZS_CLOCK;
1419 up[1].port.fifosize = 1;
1420 up[1].port.ops = &sunzilog_pops;
1421 up[1].port.type = PORT_SUNZILOG;
1422 up[1].port.flags = 0;
1423 up[1].port.line = (inst * 2) + 1;
1424 up[1].port.dev = &op->dev;
1425 up[1].flags |= 0;
1426 if (keyboard_mouse)
1427 up[1].flags |= SUNZILOG_FLAG_CONS_MOUSE;
1428 sunzilog_init_hw(&up[1]);
1429
1430 if (!keyboard_mouse) {
1431 err = uart_add_one_port(&sunzilog_reg, &up[0].port);
1432 if (err) {
1433 of_iounmap(&op->resource[0],
1434 rp, sizeof(struct zilog_layout));
1435 return err;
1436 }
1437 err = uart_add_one_port(&sunzilog_reg, &up[1].port);
1438 if (err) {
1439 uart_remove_one_port(&sunzilog_reg, &up[0].port);
1440 of_iounmap(&op->resource[0],
1441 rp, sizeof(struct zilog_layout));
1442 return err;
1443 }
1444 } else {
1445 printk(KERN_INFO "%s: Keyboard at MMIO 0x%lx (irq = %d) "
1446 "is a %s\n",
1447 op->dev.bus_id, up[0].port.mapbase, op->irqs[0],
1448 sunzilog_type (&up[0].port));
1449 printk(KERN_INFO "%s: Mouse at MMIO 0x%lx (irq = %d) "
1450 "is a %s\n",
1451 op->dev.bus_id, up[1].port.mapbase, op->irqs[0],
1452 sunzilog_type (&up[1].port));
1453 }
1454
1455 dev_set_drvdata(&op->dev, &up[0]);
1456
1457 inst++;
1458
1459 return 0;
1460 }
1461
1462 static void __devexit zs_remove_one(struct uart_sunzilog_port *up)
1463 {
1464 if (ZS_IS_KEYB(up) || ZS_IS_MOUSE(up)) {
1465 #ifdef CONFIG_SERIO
1466 serio_unregister_port(&up->serio);
1467 #endif
1468 } else
1469 uart_remove_one_port(&sunzilog_reg, &up->port);
1470 }
1471
1472 static int __devexit zs_remove(struct of_device *op)
1473 {
1474 struct uart_sunzilog_port *up = dev_get_drvdata(&op->dev);
1475 struct zilog_layout __iomem *regs;
1476
1477 zs_remove_one(&up[0]);
1478 zs_remove_one(&up[1]);
1479
1480 regs = sunzilog_chip_regs[up[0].port.line / 2];
1481 of_iounmap(&op->resource[0], regs, sizeof(struct zilog_layout));
1482
1483 dev_set_drvdata(&op->dev, NULL);
1484
1485 return 0;
1486 }
1487
1488 static struct of_device_id zs_match[] = {
1489 {
1490 .name = "zs",
1491 },
1492 {},
1493 };
1494 MODULE_DEVICE_TABLE(of, zs_match);
1495
1496 static struct of_platform_driver zs_driver = {
1497 .name = "zs",
1498 .match_table = zs_match,
1499 .probe = zs_probe,
1500 .remove = __devexit_p(zs_remove),
1501 };
1502
1503 static int __init sunzilog_init(void)
1504 {
1505 struct device_node *dp;
1506 int err, uart_count;
1507 int num_keybms;
1508
1509 NUM_SUNZILOG = 0;
1510 num_keybms = 0;
1511 for_each_node_by_name(dp, "zs") {
1512 NUM_SUNZILOG++;
1513 if (of_find_property(dp, "keyboard", NULL))
1514 num_keybms++;
1515 }
1516
1517 uart_count = 0;
1518 if (NUM_SUNZILOG) {
1519 int uart_count;
1520
1521 err = sunzilog_alloc_tables();
1522 if (err)
1523 goto out;
1524
1525 uart_count = (NUM_SUNZILOG * 2) - (2 * num_keybms);
1526
1527 sunzilog_reg.nr = uart_count;
1528 sunzilog_reg.minor = sunserial_current_minor;
1529 err = uart_register_driver(&sunzilog_reg);
1530 if (err)
1531 goto out_free_tables;
1532
1533 sunzilog_reg.tty_driver->name_base = sunzilog_reg.minor - 64;
1534 sunzilog_reg.cons = SUNZILOG_CONSOLE();
1535
1536 sunserial_current_minor += uart_count;
1537 }
1538
1539 err = of_register_driver(&zs_driver, &of_bus_type);
1540 if (err)
1541 goto out_unregister_uart;
1542
1543 if (zilog_irq != -1) {
1544 struct uart_sunzilog_port *up = sunzilog_irq_chain;
1545 err = request_irq(zilog_irq, sunzilog_interrupt, IRQF_SHARED,
1546 "zs", sunzilog_irq_chain);
1547 if (err)
1548 goto out_unregister_driver;
1549
1550 /* Enable Interrupts */
1551 while (up) {
1552 struct zilog_channel __iomem *channel;
1553
1554 /* printk (KERN_INFO "Enable IRQ for ZILOG Hardware %p\n", up); */
1555 channel = ZILOG_CHANNEL_FROM_PORT(&up->port);
1556 up->flags |= SUNZILOG_FLAG_ISR_HANDLER;
1557 up->curregs[R9] |= MIE;
1558 write_zsreg(channel, R9, up->curregs[R9]);
1559 up = up->next;
1560 }
1561 }
1562
1563 out:
1564 return err;
1565
1566 out_unregister_driver:
1567 of_unregister_driver(&zs_driver);
1568
1569 out_unregister_uart:
1570 if (NUM_SUNZILOG) {
1571 uart_unregister_driver(&sunzilog_reg);
1572 sunzilog_reg.cons = NULL;
1573 }
1574
1575 out_free_tables:
1576 sunzilog_free_tables();
1577 goto out;
1578 }
1579
1580 static void __exit sunzilog_exit(void)
1581 {
1582 of_unregister_driver(&zs_driver);
1583
1584 if (zilog_irq != -1) {
1585 struct uart_sunzilog_port *up = sunzilog_irq_chain;
1586
1587 /* Disable Interrupts */
1588 while (up) {
1589 struct zilog_channel __iomem *channel;
1590
1591 /* printk (KERN_INFO "Disable IRQ for ZILOG Hardware %p\n", up); */
1592 channel = ZILOG_CHANNEL_FROM_PORT(&up->port);
1593 up->flags &= ~SUNZILOG_FLAG_ISR_HANDLER;
1594 up->curregs[R9] &= ~MIE;
1595 write_zsreg(channel, R9, up->curregs[R9]);
1596 up = up->next;
1597 }
1598
1599 free_irq(zilog_irq, sunzilog_irq_chain);
1600 zilog_irq = -1;
1601 }
1602
1603 if (NUM_SUNZILOG) {
1604 uart_unregister_driver(&sunzilog_reg);
1605 sunzilog_free_tables();
1606 }
1607 }
1608
1609 module_init(sunzilog_init);
1610 module_exit(sunzilog_exit);
1611
1612 MODULE_AUTHOR("David S. Miller");
1613 MODULE_DESCRIPTION("Sun Zilog serial port driver");
1614 MODULE_VERSION("2.0");
1615 MODULE_LICENSE("GPL");
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree