?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
sh: sh7724: Add JPU support
[linux-2.6/mini2440.git] / drivers / serial / sunzilog.c
blobe09d3cebb4fb4d221b12b8b0b022a434ebaee7f4
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 #include <linux/of_device.h>
36
37 #include <asm/io.h>
38 #include <asm/irq.h>
39 #include <asm/prom.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->port.tty != NULL) /* Keyboard || mouse */
333 tty = up->port.info->port.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 int uart_chip_count;
1019 static struct uart_sunzilog_port *sunzilog_port_table;
1020 static struct zilog_layout __iomem **sunzilog_chip_regs;
1021
1022 static struct uart_sunzilog_port *sunzilog_irq_chain;
1023
1024 static struct uart_driver sunzilog_reg = {
1025 .owner = THIS_MODULE,
1026 .driver_name = "sunzilog",
1027 .dev_name = "ttyS",
1028 .major = TTY_MAJOR,
1029 };
1030
1031 static int __init sunzilog_alloc_tables(int num_sunzilog)
1032 {
1033 struct uart_sunzilog_port *up;
1034 unsigned long size;
1035 int num_channels = num_sunzilog * 2;
1036 int i;
1037
1038 size = num_channels * sizeof(struct uart_sunzilog_port);
1039 sunzilog_port_table = kzalloc(size, GFP_KERNEL);
1040 if (!sunzilog_port_table)
1041 return -ENOMEM;
1042
1043 for (i = 0; i < num_channels; i++) {
1044 up = &sunzilog_port_table[i];
1045
1046 spin_lock_init(&up->port.lock);
1047
1048 if (i == 0)
1049 sunzilog_irq_chain = up;
1050
1051 if (i < num_channels - 1)
1052 up->next = up + 1;
1053 else
1054 up->next = NULL;
1055 }
1056
1057 size = num_sunzilog * sizeof(struct zilog_layout __iomem *);
1058 sunzilog_chip_regs = kzalloc(size, GFP_KERNEL);
1059 if (!sunzilog_chip_regs) {
1060 kfree(sunzilog_port_table);
1061 sunzilog_irq_chain = NULL;
1062 return -ENOMEM;
1063 }
1064
1065 return 0;
1066 }
1067
1068 static void sunzilog_free_tables(void)
1069 {
1070 kfree(sunzilog_port_table);
1071 sunzilog_irq_chain = NULL;
1072 kfree(sunzilog_chip_regs);
1073 }
1074
1075 #define ZS_PUT_CHAR_MAX_DELAY 2000 /* 10 ms */
1076
1077 static void sunzilog_putchar(struct uart_port *port, int ch)
1078 {
1079 struct zilog_channel __iomem *channel = ZILOG_CHANNEL_FROM_PORT(port);
1080 int loops = ZS_PUT_CHAR_MAX_DELAY;
1081
1082 /* This is a timed polling loop so do not switch the explicit
1083 * udelay with ZSDELAY as that is a NOP on some platforms. -DaveM
1084 */
1085 do {
1086 unsigned char val = readb(&channel->control);
1087 if (val & Tx_BUF_EMP) {
1088 ZSDELAY();
1089 break;
1090 }
1091 udelay(5);
1092 } while (--loops);
1093
1094 writeb(ch, &channel->data);
1095 ZSDELAY();
1096 ZS_WSYNC(channel);
1097 }
1098
1099 #ifdef CONFIG_SERIO
1100
1101 static DEFINE_SPINLOCK(sunzilog_serio_lock);
1102
1103 static int sunzilog_serio_write(struct serio *serio, unsigned char ch)
1104 {
1105 struct uart_sunzilog_port *up = serio->port_data;
1106 unsigned long flags;
1107
1108 spin_lock_irqsave(&sunzilog_serio_lock, flags);
1109
1110 sunzilog_putchar(&up->port, ch);
1111
1112 spin_unlock_irqrestore(&sunzilog_serio_lock, flags);
1113
1114 return 0;
1115 }
1116
1117 static int sunzilog_serio_open(struct serio *serio)
1118 {
1119 struct uart_sunzilog_port *up = serio->port_data;
1120 unsigned long flags;
1121 int ret;
1122
1123 spin_lock_irqsave(&sunzilog_serio_lock, flags);
1124 if (!up->serio_open) {
1125 up->serio_open = 1;
1126 ret = 0;
1127 } else
1128 ret = -EBUSY;
1129 spin_unlock_irqrestore(&sunzilog_serio_lock, flags);
1130
1131 return ret;
1132 }
1133
1134 static void sunzilog_serio_close(struct serio *serio)
1135 {
1136 struct uart_sunzilog_port *up = serio->port_data;
1137 unsigned long flags;
1138
1139 spin_lock_irqsave(&sunzilog_serio_lock, flags);
1140 up->serio_open = 0;
1141 spin_unlock_irqrestore(&sunzilog_serio_lock, flags);
1142 }
1143
1144 #endif /* CONFIG_SERIO */
1145
1146 #ifdef CONFIG_SERIAL_SUNZILOG_CONSOLE
1147 static void
1148 sunzilog_console_write(struct console *con, const char *s, unsigned int count)
1149 {
1150 struct uart_sunzilog_port *up = &sunzilog_port_table[con->index];
1151 unsigned long flags;
1152 int locked = 1;
1153
1154 local_irq_save(flags);
1155 if (up->port.sysrq) {
1156 locked = 0;
1157 } else if (oops_in_progress) {
1158 locked = spin_trylock(&up->port.lock);
1159 } else
1160 spin_lock(&up->port.lock);
1161
1162 uart_console_write(&up->port, s, count, sunzilog_putchar);
1163 udelay(2);
1164
1165 if (locked)
1166 spin_unlock(&up->port.lock);
1167 local_irq_restore(flags);
1168 }
1169
1170 static int __init sunzilog_console_setup(struct console *con, char *options)
1171 {
1172 struct uart_sunzilog_port *up = &sunzilog_port_table[con->index];
1173 unsigned long flags;
1174 int baud, brg;
1175
1176 if (up->port.type != PORT_SUNZILOG)
1177 return -1;
1178
1179 printk(KERN_INFO "Console: ttyS%d (SunZilog zs%d)\n",
1180 (sunzilog_reg.minor - 64) + con->index, con->index);
1181
1182 /* Get firmware console settings. */
1183 sunserial_console_termios(con);
1184
1185 /* Firmware console speed is limited to 150-->38400 baud so
1186 * this hackish cflag thing is OK.
1187 */
1188 switch (con->cflag & CBAUD) {
1189 case B150: baud = 150; break;
1190 case B300: baud = 300; break;
1191 case B600: baud = 600; break;
1192 case B1200: baud = 1200; break;
1193 case B2400: baud = 2400; break;
1194 case B4800: baud = 4800; break;
1195 default: case B9600: baud = 9600; break;
1196 case B19200: baud = 19200; break;
1197 case B38400: baud = 38400; break;
1198 };
1199
1200 brg = BPS_TO_BRG(baud, ZS_CLOCK / ZS_CLOCK_DIVISOR);
1201
1202 spin_lock_irqsave(&up->port.lock, flags);
1203
1204 up->curregs[R15] |= BRKIE;
1205 sunzilog_convert_to_zs(up, con->cflag, 0, brg);
1206
1207 sunzilog_set_mctrl(&up->port, TIOCM_DTR | TIOCM_RTS);
1208 __sunzilog_startup(up);
1209
1210 spin_unlock_irqrestore(&up->port.lock, flags);
1211
1212 return 0;
1213 }
1214
1215 static struct console sunzilog_console_ops = {
1216 .name = "ttyS",
1217 .write = sunzilog_console_write,
1218 .device = uart_console_device,
1219 .setup = sunzilog_console_setup,
1220 .flags = CON_PRINTBUFFER,
1221 .index = -1,
1222 .data = &sunzilog_reg,
1223 };
1224
1225 static inline struct console *SUNZILOG_CONSOLE(void)
1226 {
1227 return &sunzilog_console_ops;
1228 }
1229
1230 #else
1231 #define SUNZILOG_CONSOLE() (NULL)
1232 #endif
1233
1234 static void __devinit sunzilog_init_kbdms(struct uart_sunzilog_port *up)
1235 {
1236 int baud, brg;
1237
1238 if (up->flags & SUNZILOG_FLAG_CONS_KEYB) {
1239 up->cflag = B1200 | CS8 | CLOCAL | CREAD;
1240 baud = 1200;
1241 } else {
1242 up->cflag = B4800 | CS8 | CLOCAL | CREAD;
1243 baud = 4800;
1244 }
1245
1246 up->curregs[R15] |= BRKIE;
1247 brg = BPS_TO_BRG(baud, ZS_CLOCK / ZS_CLOCK_DIVISOR);
1248 sunzilog_convert_to_zs(up, up->cflag, 0, brg);
1249 sunzilog_set_mctrl(&up->port, TIOCM_DTR | TIOCM_RTS);
1250 __sunzilog_startup(up);
1251 }
1252
1253 #ifdef CONFIG_SERIO
1254 static void __devinit sunzilog_register_serio(struct uart_sunzilog_port *up)
1255 {
1256 struct serio *serio = &up->serio;
1257
1258 serio->port_data = up;
1259
1260 serio->id.type = SERIO_RS232;
1261 if (up->flags & SUNZILOG_FLAG_CONS_KEYB) {
1262 serio->id.proto = SERIO_SUNKBD;
1263 strlcpy(serio->name, "zskbd", sizeof(serio->name));
1264 } else {
1265 serio->id.proto = SERIO_SUN;
1266 serio->id.extra = 1;
1267 strlcpy(serio->name, "zsms", sizeof(serio->name));
1268 }
1269 strlcpy(serio->phys,
1270 ((up->flags & SUNZILOG_FLAG_CONS_KEYB) ?
1271 "zs/serio0" : "zs/serio1"),
1272 sizeof(serio->phys));
1273
1274 serio->write = sunzilog_serio_write;
1275 serio->open = sunzilog_serio_open;
1276 serio->close = sunzilog_serio_close;
1277 serio->dev.parent = up->port.dev;
1278
1279 serio_register_port(serio);
1280 }
1281 #endif
1282
1283 static void __devinit sunzilog_init_hw(struct uart_sunzilog_port *up)
1284 {
1285 struct zilog_channel __iomem *channel;
1286 unsigned long flags;
1287 int baud, brg;
1288
1289 channel = ZILOG_CHANNEL_FROM_PORT(&up->port);
1290
1291 spin_lock_irqsave(&up->port.lock, flags);
1292 if (ZS_IS_CHANNEL_A(up)) {
1293 write_zsreg(channel, R9, FHWRES);
1294 ZSDELAY_LONG();
1295 (void) read_zsreg(channel, R0);
1296 }
1297
1298 if (up->flags & (SUNZILOG_FLAG_CONS_KEYB |
1299 SUNZILOG_FLAG_CONS_MOUSE)) {
1300 up->curregs[R1] = EXT_INT_ENAB | INT_ALL_Rx | TxINT_ENAB;
1301 up->curregs[R4] = PAR_EVEN | X16CLK | SB1;
1302 up->curregs[R3] = RxENAB | Rx8;
1303 up->curregs[R5] = TxENAB | Tx8;
1304 up->curregs[R6] = 0x00; /* SDLC Address */
1305 up->curregs[R7] = 0x7E; /* SDLC Flag */
1306 up->curregs[R9] = NV;
1307 up->curregs[R7p] = 0x00;
1308 sunzilog_init_kbdms(up);
1309 /* Only enable interrupts if an ISR handler available */
1310 if (up->flags & SUNZILOG_FLAG_ISR_HANDLER)
1311 up->curregs[R9] |= MIE;
1312 write_zsreg(channel, R9, up->curregs[R9]);
1313 } else {
1314 /* Normal serial TTY. */
1315 up->parity_mask = 0xff;
1316 up->curregs[R1] = EXT_INT_ENAB | INT_ALL_Rx | TxINT_ENAB;
1317 up->curregs[R4] = PAR_EVEN | X16CLK | SB1;
1318 up->curregs[R3] = RxENAB | Rx8;
1319 up->curregs[R5] = TxENAB | Tx8;
1320 up->curregs[R6] = 0x00; /* SDLC Address */
1321 up->curregs[R7] = 0x7E; /* SDLC Flag */
1322 up->curregs[R9] = NV;
1323 up->curregs[R10] = NRZ;
1324 up->curregs[R11] = TCBR | RCBR;
1325 baud = 9600;
1326 brg = BPS_TO_BRG(baud, ZS_CLOCK / ZS_CLOCK_DIVISOR);
1327 up->curregs[R12] = (brg & 0xff);
1328 up->curregs[R13] = (brg >> 8) & 0xff;
1329 up->curregs[R14] = BRSRC | BRENAB;
1330 up->curregs[R15] = FIFOEN; /* Use FIFO if on ESCC */
1331 up->curregs[R7p] = TxFIFO_LVL | RxFIFO_LVL;
1332 if (__load_zsregs(channel, up->curregs)) {
1333 up->flags |= SUNZILOG_FLAG_ESCC;
1334 }
1335 /* Only enable interrupts if an ISR handler available */
1336 if (up->flags & SUNZILOG_FLAG_ISR_HANDLER)
1337 up->curregs[R9] |= MIE;
1338 write_zsreg(channel, R9, up->curregs[R9]);
1339 }
1340
1341 spin_unlock_irqrestore(&up->port.lock, flags);
1342
1343 #ifdef CONFIG_SERIO
1344 if (up->flags & (SUNZILOG_FLAG_CONS_KEYB |
1345 SUNZILOG_FLAG_CONS_MOUSE))
1346 sunzilog_register_serio(up);
1347 #endif
1348 }
1349
1350 static int zilog_irq = -1;
1351
1352 static int __devinit zs_probe(struct of_device *op, const struct of_device_id *match)
1353 {
1354 static int kbm_inst, uart_inst;
1355 int inst;
1356 struct uart_sunzilog_port *up;
1357 struct zilog_layout __iomem *rp;
1358 int keyboard_mouse = 0;
1359 int err;
1360
1361 if (of_find_property(op->node, "keyboard", NULL))
1362 keyboard_mouse = 1;
1363
1364 /* uarts must come before keyboards/mice */
1365 if (keyboard_mouse)
1366 inst = uart_chip_count + kbm_inst;
1367 else
1368 inst = uart_inst;
1369
1370 sunzilog_chip_regs[inst] = of_ioremap(&op->resource[0], 0,
1371 sizeof(struct zilog_layout),
1372 "zs");
1373 if (!sunzilog_chip_regs[inst])
1374 return -ENOMEM;
1375
1376 rp = sunzilog_chip_regs[inst];
1377
1378 if (zilog_irq == -1)
1379 zilog_irq = op->irqs[0];
1380
1381 up = &sunzilog_port_table[inst * 2];
1382
1383 /* Channel A */
1384 up[0].port.mapbase = op->resource[0].start + 0x00;
1385 up[0].port.membase = (void __iomem *) &rp->channelA;
1386 up[0].port.iotype = UPIO_MEM;
1387 up[0].port.irq = op->irqs[0];
1388 up[0].port.uartclk = ZS_CLOCK;
1389 up[0].port.fifosize = 1;
1390 up[0].port.ops = &sunzilog_pops;
1391 up[0].port.type = PORT_SUNZILOG;
1392 up[0].port.flags = 0;
1393 up[0].port.line = (inst * 2) + 0;
1394 up[0].port.dev = &op->dev;
1395 up[0].flags |= SUNZILOG_FLAG_IS_CHANNEL_A;
1396 if (keyboard_mouse)
1397 up[0].flags |= SUNZILOG_FLAG_CONS_KEYB;
1398 sunzilog_init_hw(&up[0]);
1399
1400 /* Channel B */
1401 up[1].port.mapbase = op->resource[0].start + 0x04;
1402 up[1].port.membase = (void __iomem *) &rp->channelB;
1403 up[1].port.iotype = UPIO_MEM;
1404 up[1].port.irq = op->irqs[0];
1405 up[1].port.uartclk = ZS_CLOCK;
1406 up[1].port.fifosize = 1;
1407 up[1].port.ops = &sunzilog_pops;
1408 up[1].port.type = PORT_SUNZILOG;
1409 up[1].port.flags = 0;
1410 up[1].port.line = (inst * 2) + 1;
1411 up[1].port.dev = &op->dev;
1412 up[1].flags |= 0;
1413 if (keyboard_mouse)
1414 up[1].flags |= SUNZILOG_FLAG_CONS_MOUSE;
1415 sunzilog_init_hw(&up[1]);
1416
1417 if (!keyboard_mouse) {
1418 if (sunserial_console_match(SUNZILOG_CONSOLE(), op->node,
1419 &sunzilog_reg, up[0].port.line))
1420 up->flags |= SUNZILOG_FLAG_IS_CONS;
1421 err = uart_add_one_port(&sunzilog_reg, &up[0].port);
1422 if (err) {
1423 of_iounmap(&op->resource[0],
1424 rp, sizeof(struct zilog_layout));
1425 return err;
1426 }
1427 if (sunserial_console_match(SUNZILOG_CONSOLE(), op->node,
1428 &sunzilog_reg, up[1].port.line))
1429 up->flags |= SUNZILOG_FLAG_IS_CONS;
1430 err = uart_add_one_port(&sunzilog_reg, &up[1].port);
1431 if (err) {
1432 uart_remove_one_port(&sunzilog_reg, &up[0].port);
1433 of_iounmap(&op->resource[0],
1434 rp, sizeof(struct zilog_layout));
1435 return err;
1436 }
1437 uart_inst++;
1438 } else {
1439 printk(KERN_INFO "%s: Keyboard at MMIO 0x%llx (irq = %d) "
1440 "is a %s\n",
1441 dev_name(&op->dev),
1442 (unsigned long long) up[0].port.mapbase,
1443 op->irqs[0], sunzilog_type(&up[0].port));
1444 printk(KERN_INFO "%s: Mouse at MMIO 0x%llx (irq = %d) "
1445 "is a %s\n",
1446 dev_name(&op->dev),
1447 (unsigned long long) up[1].port.mapbase,
1448 op->irqs[0], sunzilog_type(&up[1].port));
1449 kbm_inst++;
1450 }
1451
1452 dev_set_drvdata(&op->dev, &up[0]);
1453
1454 return 0;
1455 }
1456
1457 static void __devexit zs_remove_one(struct uart_sunzilog_port *up)
1458 {
1459 if (ZS_IS_KEYB(up) || ZS_IS_MOUSE(up)) {
1460 #ifdef CONFIG_SERIO
1461 serio_unregister_port(&up->serio);
1462 #endif
1463 } else
1464 uart_remove_one_port(&sunzilog_reg, &up->port);
1465 }
1466
1467 static int __devexit zs_remove(struct of_device *op)
1468 {
1469 struct uart_sunzilog_port *up = dev_get_drvdata(&op->dev);
1470 struct zilog_layout __iomem *regs;
1471
1472 zs_remove_one(&up[0]);
1473 zs_remove_one(&up[1]);
1474
1475 regs = sunzilog_chip_regs[up[0].port.line / 2];
1476 of_iounmap(&op->resource[0], regs, sizeof(struct zilog_layout));
1477
1478 dev_set_drvdata(&op->dev, NULL);
1479
1480 return 0;
1481 }
1482
1483 static const struct of_device_id zs_match[] = {
1484 {
1485 .name = "zs",
1486 },
1487 {},
1488 };
1489 MODULE_DEVICE_TABLE(of, zs_match);
1490
1491 static struct of_platform_driver zs_driver = {
1492 .name = "zs",
1493 .match_table = zs_match,
1494 .probe = zs_probe,
1495 .remove = __devexit_p(zs_remove),
1496 };
1497
1498 static int __init sunzilog_init(void)
1499 {
1500 struct device_node *dp;
1501 int err;
1502 int num_keybms = 0;
1503 int num_sunzilog = 0;
1504
1505 for_each_node_by_name(dp, "zs") {
1506 num_sunzilog++;
1507 if (of_find_property(dp, "keyboard", NULL))
1508 num_keybms++;
1509 }
1510
1511 if (num_sunzilog) {
1512 err = sunzilog_alloc_tables(num_sunzilog);
1513 if (err)
1514 goto out;
1515
1516 uart_chip_count = num_sunzilog - num_keybms;
1517
1518 err = sunserial_register_minors(&sunzilog_reg,
1519 uart_chip_count * 2);
1520 if (err)
1521 goto out_free_tables;
1522 }
1523
1524 err = of_register_driver(&zs_driver, &of_bus_type);
1525 if (err)
1526 goto out_unregister_uart;
1527
1528 if (zilog_irq != -1) {
1529 struct uart_sunzilog_port *up = sunzilog_irq_chain;
1530 err = request_irq(zilog_irq, sunzilog_interrupt, IRQF_SHARED,
1531 "zs", sunzilog_irq_chain);
1532 if (err)
1533 goto out_unregister_driver;
1534
1535 /* Enable Interrupts */
1536 while (up) {
1537 struct zilog_channel __iomem *channel;
1538
1539 /* printk (KERN_INFO "Enable IRQ for ZILOG Hardware %p\n", up); */
1540 channel = ZILOG_CHANNEL_FROM_PORT(&up->port);
1541 up->flags |= SUNZILOG_FLAG_ISR_HANDLER;
1542 up->curregs[R9] |= MIE;
1543 write_zsreg(channel, R9, up->curregs[R9]);
1544 up = up->next;
1545 }
1546 }
1547
1548 out:
1549 return err;
1550
1551 out_unregister_driver:
1552 of_unregister_driver(&zs_driver);
1553
1554 out_unregister_uart:
1555 if (num_sunzilog) {
1556 sunserial_unregister_minors(&sunzilog_reg, num_sunzilog);
1557 sunzilog_reg.cons = NULL;
1558 }
1559
1560 out_free_tables:
1561 sunzilog_free_tables();
1562 goto out;
1563 }
1564
1565 static void __exit sunzilog_exit(void)
1566 {
1567 of_unregister_driver(&zs_driver);
1568
1569 if (zilog_irq != -1) {
1570 struct uart_sunzilog_port *up = sunzilog_irq_chain;
1571
1572 /* Disable Interrupts */
1573 while (up) {
1574 struct zilog_channel __iomem *channel;
1575
1576 /* printk (KERN_INFO "Disable IRQ for ZILOG Hardware %p\n", up); */
1577 channel = ZILOG_CHANNEL_FROM_PORT(&up->port);
1578 up->flags &= ~SUNZILOG_FLAG_ISR_HANDLER;
1579 up->curregs[R9] &= ~MIE;
1580 write_zsreg(channel, R9, up->curregs[R9]);
1581 up = up->next;
1582 }
1583
1584 free_irq(zilog_irq, sunzilog_irq_chain);
1585 zilog_irq = -1;
1586 }
1587
1588 if (sunzilog_reg.nr) {
1589 sunserial_unregister_minors(&sunzilog_reg, sunzilog_reg.nr);
1590 sunzilog_free_tables();
1591 }
1592 }
1593
1594 module_init(sunzilog_init);
1595 module_exit(sunzilog_exit);
1596
1597 MODULE_AUTHOR("David S. Miller");
1598 MODULE_DESCRIPTION("Sun Zilog serial port driver");
1599 MODULE_VERSION("2.0");
1600 MODULE_LICENSE("GPL");
Support for the Chinese Samsung S3C2440 based development boards