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[CPUFREQ] Fix the p4-clockmod N60 errata workaround.
[linux-2.6/mini2440.git] / drivers / serial / sunzilog.c
blob5cc4d4c2935ce7e3f2b685d4ed44e69025b12b1e
1 /*
2 * sunzilog.c
3 *
4 * Driver for Zilog serial chips found on Sun workstations and
5 * servers. This driver could actually be made more generic.
6 *
7 * This is based on the old drivers/sbus/char/zs.c code. A lot
8 * of code has been simply moved over directly from there but
9 * much has been rewritten. Credits therefore go out to Eddie
10 * C. Dost, Pete Zaitcev, Ted Ts'o and Alex Buell for their
11 * work there.
12 *
13 * Copyright (C) 2002 David S. Miller (davem@redhat.com)
14 */
15
16 #include <linux/config.h>
17 #include <linux/module.h>
18 #include <linux/kernel.h>
19 #include <linux/sched.h>
20 #include <linux/errno.h>
21 #include <linux/delay.h>
22 #include <linux/tty.h>
23 #include <linux/tty_flip.h>
24 #include <linux/major.h>
25 #include <linux/string.h>
26 #include <linux/ptrace.h>
27 #include <linux/ioport.h>
28 #include <linux/slab.h>
29 #include <linux/circ_buf.h>
30 #include <linux/serial.h>
31 #include <linux/sysrq.h>
32 #include <linux/console.h>
33 #include <linux/spinlock.h>
34 #ifdef CONFIG_SERIO
35 #include <linux/serio.h>
36 #endif
37 #include <linux/init.h>
38
39 #include <asm/io.h>
40 #include <asm/irq.h>
41 #ifdef CONFIG_SPARC64
42 #include <asm/fhc.h>
43 #endif
44 #include <asm/sbus.h>
45
46 #if defined(CONFIG_SERIAL_SUNZILOG_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
47 #define SUPPORT_SYSRQ
48 #endif
49
50 #include <linux/serial_core.h>
51
52 #include "suncore.h"
53 #include "sunzilog.h"
54
55 /* On 32-bit sparcs we need to delay after register accesses
56 * to accommodate sun4 systems, but we do not need to flush writes.
57 * On 64-bit sparc we only need to flush single writes to ensure
58 * completion.
59 */
60 #ifndef CONFIG_SPARC64
61 #define ZSDELAY() udelay(5)
62 #define ZSDELAY_LONG() udelay(20)
63 #define ZS_WSYNC(channel) do { } while (0)
64 #else
65 #define ZSDELAY()
66 #define ZSDELAY_LONG()
67 #define ZS_WSYNC(__channel) \
68 sbus_readb(&((__channel)->control))
69 #endif
70
71 static int num_sunzilog;
72 #define NUM_SUNZILOG num_sunzilog
73 #define NUM_CHANNELS (NUM_SUNZILOG * 2)
74
75 #define KEYBOARD_LINE 0x2
76 #define MOUSE_LINE 0x3
77
78 #define ZS_CLOCK 4915200 /* Zilog input clock rate. */
79 #define ZS_CLOCK_DIVISOR 16 /* Divisor this driver uses. */
80
81 /*
82 * We wrap our port structure around the generic uart_port.
83 */
84 struct uart_sunzilog_port {
85 struct uart_port port;
86
87 /* IRQ servicing chain. */
88 struct uart_sunzilog_port *next;
89
90 /* Current values of Zilog write registers. */
91 unsigned char curregs[NUM_ZSREGS];
92
93 unsigned int flags;
94 #define SUNZILOG_FLAG_CONS_KEYB 0x00000001
95 #define SUNZILOG_FLAG_CONS_MOUSE 0x00000002
96 #define SUNZILOG_FLAG_IS_CONS 0x00000004
97 #define SUNZILOG_FLAG_IS_KGDB 0x00000008
98 #define SUNZILOG_FLAG_MODEM_STATUS 0x00000010
99 #define SUNZILOG_FLAG_IS_CHANNEL_A 0x00000020
100 #define SUNZILOG_FLAG_REGS_HELD 0x00000040
101 #define SUNZILOG_FLAG_TX_STOPPED 0x00000080
102 #define SUNZILOG_FLAG_TX_ACTIVE 0x00000100
103
104 unsigned int cflag;
105
106 unsigned char parity_mask;
107 unsigned char prev_status;
108
109 #ifdef CONFIG_SERIO
110 struct serio *serio;
111 int serio_open;
112 #endif
113 };
114
115 #define ZILOG_CHANNEL_FROM_PORT(PORT) ((struct zilog_channel __iomem *)((PORT)->membase))
116 #define UART_ZILOG(PORT) ((struct uart_sunzilog_port *)(PORT))
117
118 #define ZS_IS_KEYB(UP) ((UP)->flags & SUNZILOG_FLAG_CONS_KEYB)
119 #define ZS_IS_MOUSE(UP) ((UP)->flags & SUNZILOG_FLAG_CONS_MOUSE)
120 #define ZS_IS_CONS(UP) ((UP)->flags & SUNZILOG_FLAG_IS_CONS)
121 #define ZS_IS_KGDB(UP) ((UP)->flags & SUNZILOG_FLAG_IS_KGDB)
122 #define ZS_WANTS_MODEM_STATUS(UP) ((UP)->flags & SUNZILOG_FLAG_MODEM_STATUS)
123 #define ZS_IS_CHANNEL_A(UP) ((UP)->flags & SUNZILOG_FLAG_IS_CHANNEL_A)
124 #define ZS_REGS_HELD(UP) ((UP)->flags & SUNZILOG_FLAG_REGS_HELD)
125 #define ZS_TX_STOPPED(UP) ((UP)->flags & SUNZILOG_FLAG_TX_STOPPED)
126 #define ZS_TX_ACTIVE(UP) ((UP)->flags & SUNZILOG_FLAG_TX_ACTIVE)
127
128 /* Reading and writing Zilog8530 registers. The delays are to make this
129 * driver work on the Sun4 which needs a settling delay after each chip
130 * register access, other machines handle this in hardware via auxiliary
131 * flip-flops which implement the settle time we do in software.
132 *
133 * The port lock must be held and local IRQs must be disabled
134 * when {read,write}_zsreg is invoked.
135 */
136 static unsigned char read_zsreg(struct zilog_channel __iomem *channel,
137 unsigned char reg)
138 {
139 unsigned char retval;
140
141 sbus_writeb(reg, &channel->control);
142 ZSDELAY();
143 retval = sbus_readb(&channel->control);
144 ZSDELAY();
145
146 return retval;
147 }
148
149 static void write_zsreg(struct zilog_channel __iomem *channel,
150 unsigned char reg, unsigned char value)
151 {
152 sbus_writeb(reg, &channel->control);
153 ZSDELAY();
154 sbus_writeb(value, &channel->control);
155 ZSDELAY();
156 }
157
158 static void sunzilog_clear_fifo(struct zilog_channel __iomem *channel)
159 {
160 int i;
161
162 for (i = 0; i < 32; i++) {
163 unsigned char regval;
164
165 regval = sbus_readb(&channel->control);
166 ZSDELAY();
167 if (regval & Rx_CH_AV)
168 break;
169
170 regval = read_zsreg(channel, R1);
171 sbus_readb(&channel->data);
172 ZSDELAY();
173
174 if (regval & (PAR_ERR | Rx_OVR | CRC_ERR)) {
175 sbus_writeb(ERR_RES, &channel->control);
176 ZSDELAY();
177 ZS_WSYNC(channel);
178 }
179 }
180 }
181
182 /* This function must only be called when the TX is not busy. The UART
183 * port lock must be held and local interrupts disabled.
184 */
185 static void __load_zsregs(struct zilog_channel __iomem *channel, unsigned char *regs)
186 {
187 int i;
188
189 /* Let pending transmits finish. */
190 for (i = 0; i < 1000; i++) {
191 unsigned char stat = read_zsreg(channel, R1);
192 if (stat & ALL_SNT)
193 break;
194 udelay(100);
195 }
196
197 sbus_writeb(ERR_RES, &channel->control);
198 ZSDELAY();
199 ZS_WSYNC(channel);
200
201 sunzilog_clear_fifo(channel);
202
203 /* Disable all interrupts. */
204 write_zsreg(channel, R1,
205 regs[R1] & ~(RxINT_MASK | TxINT_ENAB | EXT_INT_ENAB));
206
207 /* Set parity, sync config, stop bits, and clock divisor. */
208 write_zsreg(channel, R4, regs[R4]);
209
210 /* Set misc. TX/RX control bits. */
211 write_zsreg(channel, R10, regs[R10]);
212
213 /* Set TX/RX controls sans the enable bits. */
214 write_zsreg(channel, R3, regs[R3] & ~RxENAB);
215 write_zsreg(channel, R5, regs[R5] & ~TxENAB);
216
217 /* Synchronous mode config. */
218 write_zsreg(channel, R6, regs[R6]);
219 write_zsreg(channel, R7, regs[R7]);
220
221 /* Don't mess with the interrupt vector (R2, unused by us) and
222 * master interrupt control (R9). We make sure this is setup
223 * properly at probe time then never touch it again.
224 */
225
226 /* Disable baud generator. */
227 write_zsreg(channel, R14, regs[R14] & ~BRENAB);
228
229 /* Clock mode control. */
230 write_zsreg(channel, R11, regs[R11]);
231
232 /* Lower and upper byte of baud rate generator divisor. */
233 write_zsreg(channel, R12, regs[R12]);
234 write_zsreg(channel, R13, regs[R13]);
235
236 /* Now rewrite R14, with BRENAB (if set). */
237 write_zsreg(channel, R14, regs[R14]);
238
239 /* External status interrupt control. */
240 write_zsreg(channel, R15, regs[R15]);
241
242 /* Reset external status interrupts. */
243 write_zsreg(channel, R0, RES_EXT_INT);
244 write_zsreg(channel, R0, RES_EXT_INT);
245
246 /* Rewrite R3/R5, this time without enables masked. */
247 write_zsreg(channel, R3, regs[R3]);
248 write_zsreg(channel, R5, regs[R5]);
249
250 /* Rewrite R1, this time without IRQ enabled masked. */
251 write_zsreg(channel, R1, regs[R1]);
252 }
253
254 /* Reprogram the Zilog channel HW registers with the copies found in the
255 * software state struct. If the transmitter is busy, we defer this update
256 * until the next TX complete interrupt. Else, we do it right now.
257 *
258 * The UART port lock must be held and local interrupts disabled.
259 */
260 static void sunzilog_maybe_update_regs(struct uart_sunzilog_port *up,
261 struct zilog_channel __iomem *channel)
262 {
263 if (!ZS_REGS_HELD(up)) {
264 if (ZS_TX_ACTIVE(up)) {
265 up->flags |= SUNZILOG_FLAG_REGS_HELD;
266 } else {
267 __load_zsregs(channel, up->curregs);
268 }
269 }
270 }
271
272 static void sunzilog_change_mouse_baud(struct uart_sunzilog_port *up)
273 {
274 unsigned int cur_cflag = up->cflag;
275 int brg, new_baud;
276
277 up->cflag &= ~CBAUD;
278 up->cflag |= suncore_mouse_baud_cflag_next(cur_cflag, &new_baud);
279
280 brg = BPS_TO_BRG(new_baud, ZS_CLOCK / ZS_CLOCK_DIVISOR);
281 up->curregs[R12] = (brg & 0xff);
282 up->curregs[R13] = (brg >> 8) & 0xff;
283 sunzilog_maybe_update_regs(up, ZILOG_CHANNEL_FROM_PORT(&up->port));
284 }
285
286 static void sunzilog_kbdms_receive_chars(struct uart_sunzilog_port *up,
287 unsigned char ch, int is_break,
288 struct pt_regs *regs)
289 {
290 if (ZS_IS_KEYB(up)) {
291 /* Stop-A is handled by drivers/char/keyboard.c now. */
292 #ifdef CONFIG_SERIO
293 if (up->serio_open)
294 serio_interrupt(up->serio, ch, 0, regs);
295 #endif
296 } else if (ZS_IS_MOUSE(up)) {
297 int ret = suncore_mouse_baud_detection(ch, is_break);
298
299 switch (ret) {
300 case 2:
301 sunzilog_change_mouse_baud(up);
302 /* fallthru */
303 case 1:
304 break;
305
306 case 0:
307 #ifdef CONFIG_SERIO
308 if (up->serio_open)
309 serio_interrupt(up->serio, ch, 0, regs);
310 #endif
311 break;
312 };
313 }
314 }
315
316 static struct tty_struct *
317 sunzilog_receive_chars(struct uart_sunzilog_port *up,
318 struct zilog_channel __iomem *channel,
319 struct pt_regs *regs)
320 {
321 struct tty_struct *tty;
322 unsigned char ch, r1, flag;
323
324 tty = NULL;
325 if (up->port.info != NULL && /* Unopened serial console */
326 up->port.info->tty != NULL) /* Keyboard || mouse */
327 tty = up->port.info->tty;
328
329 for (;;) {
330
331 r1 = read_zsreg(channel, R1);
332 if (r1 & (PAR_ERR | Rx_OVR | CRC_ERR)) {
333 sbus_writeb(ERR_RES, &channel->control);
334 ZSDELAY();
335 ZS_WSYNC(channel);
336 }
337
338 ch = sbus_readb(&channel->control);
339 ZSDELAY();
340
341 /* This funny hack depends upon BRK_ABRT not interfering
342 * with the other bits we care about in R1.
343 */
344 if (ch & BRK_ABRT)
345 r1 |= BRK_ABRT;
346
347 if (!(ch & Rx_CH_AV))
348 break;
349
350 ch = sbus_readb(&channel->data);
351 ZSDELAY();
352
353 ch &= up->parity_mask;
354
355 if (unlikely(ZS_IS_KEYB(up)) || unlikely(ZS_IS_MOUSE(up))) {
356 sunzilog_kbdms_receive_chars(up, ch, 0, regs);
357 continue;
358 }
359
360 if (tty == NULL) {
361 uart_handle_sysrq_char(&up->port, ch, regs);
362 continue;
363 }
364
365 /* A real serial line, record the character and status. */
366 flag = TTY_NORMAL;
367 up->port.icount.rx++;
368 if (r1 & (BRK_ABRT | PAR_ERR | Rx_OVR | CRC_ERR)) {
369 if (r1 & BRK_ABRT) {
370 r1 &= ~(PAR_ERR | CRC_ERR);
371 up->port.icount.brk++;
372 if (uart_handle_break(&up->port))
373 continue;
374 }
375 else if (r1 & PAR_ERR)
376 up->port.icount.parity++;
377 else if (r1 & CRC_ERR)
378 up->port.icount.frame++;
379 if (r1 & Rx_OVR)
380 up->port.icount.overrun++;
381 r1 &= up->port.read_status_mask;
382 if (r1 & BRK_ABRT)
383 flag = TTY_BREAK;
384 else if (r1 & PAR_ERR)
385 flag = TTY_PARITY;
386 else if (r1 & CRC_ERR)
387 flag = TTY_FRAME;
388 }
389 if (uart_handle_sysrq_char(&up->port, ch, regs))
390 continue;
391
392 if (up->port.ignore_status_mask == 0xff ||
393 (r1 & up->port.ignore_status_mask) == 0) {
394 tty_insert_flip_char(tty, ch, flag);
395 }
396 if (r1 & Rx_OVR)
397 tty_insert_flip_char(tty, 0, TTY_OVERRUN);
398 }
399
400 return tty;
401 }
402
403 static void sunzilog_status_handle(struct uart_sunzilog_port *up,
404 struct zilog_channel __iomem *channel,
405 struct pt_regs *regs)
406 {
407 unsigned char status;
408
409 status = sbus_readb(&channel->control);
410 ZSDELAY();
411
412 sbus_writeb(RES_EXT_INT, &channel->control);
413 ZSDELAY();
414 ZS_WSYNC(channel);
415
416 if (status & BRK_ABRT) {
417 if (ZS_IS_MOUSE(up))
418 sunzilog_kbdms_receive_chars(up, 0, 1, regs);
419 if (ZS_IS_CONS(up)) {
420 /* Wait for BREAK to deassert to avoid potentially
421 * confusing the PROM.
422 */
423 while (1) {
424 status = sbus_readb(&channel->control);
425 ZSDELAY();
426 if (!(status & BRK_ABRT))
427 break;
428 }
429 sun_do_break();
430 return;
431 }
432 }
433
434 if (ZS_WANTS_MODEM_STATUS(up)) {
435 if (status & SYNC)
436 up->port.icount.dsr++;
437
438 /* The Zilog just gives us an interrupt when DCD/CTS/etc. change.
439 * But it does not tell us which bit has changed, we have to keep
440 * track of this ourselves.
441 */
442 if ((status ^ up->prev_status) ^ DCD)
443 uart_handle_dcd_change(&up->port,
444 (status & DCD));
445 if ((status ^ up->prev_status) ^ CTS)
446 uart_handle_cts_change(&up->port,
447 (status & CTS));
448
449 wake_up_interruptible(&up->port.info->delta_msr_wait);
450 }
451
452 up->prev_status = status;
453 }
454
455 static void sunzilog_transmit_chars(struct uart_sunzilog_port *up,
456 struct zilog_channel __iomem *channel)
457 {
458 struct circ_buf *xmit;
459
460 if (ZS_IS_CONS(up)) {
461 unsigned char status = sbus_readb(&channel->control);
462 ZSDELAY();
463
464 /* TX still busy? Just wait for the next TX done interrupt.
465 *
466 * It can occur because of how we do serial console writes. It would
467 * be nice to transmit console writes just like we normally would for
468 * a TTY line. (ie. buffered and TX interrupt driven). That is not
469 * easy because console writes cannot sleep. One solution might be
470 * to poll on enough port->xmit space becomming free. -DaveM
471 */
472 if (!(status & Tx_BUF_EMP))
473 return;
474 }
475
476 up->flags &= ~SUNZILOG_FLAG_TX_ACTIVE;
477
478 if (ZS_REGS_HELD(up)) {
479 __load_zsregs(channel, up->curregs);
480 up->flags &= ~SUNZILOG_FLAG_REGS_HELD;
481 }
482
483 if (ZS_TX_STOPPED(up)) {
484 up->flags &= ~SUNZILOG_FLAG_TX_STOPPED;
485 goto ack_tx_int;
486 }
487
488 if (up->port.x_char) {
489 up->flags |= SUNZILOG_FLAG_TX_ACTIVE;
490 sbus_writeb(up->port.x_char, &channel->data);
491 ZSDELAY();
492 ZS_WSYNC(channel);
493
494 up->port.icount.tx++;
495 up->port.x_char = 0;
496 return;
497 }
498
499 if (up->port.info == NULL)
500 goto ack_tx_int;
501 xmit = &up->port.info->xmit;
502 if (uart_circ_empty(xmit))
503 goto ack_tx_int;
504
505 if (uart_tx_stopped(&up->port))
506 goto ack_tx_int;
507
508 up->flags |= SUNZILOG_FLAG_TX_ACTIVE;
509 sbus_writeb(xmit->buf[xmit->tail], &channel->data);
510 ZSDELAY();
511 ZS_WSYNC(channel);
512
513 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
514 up->port.icount.tx++;
515
516 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
517 uart_write_wakeup(&up->port);
518
519 return;
520
521 ack_tx_int:
522 sbus_writeb(RES_Tx_P, &channel->control);
523 ZSDELAY();
524 ZS_WSYNC(channel);
525 }
526
527 static irqreturn_t sunzilog_interrupt(int irq, void *dev_id, struct pt_regs *regs)
528 {
529 struct uart_sunzilog_port *up = dev_id;
530
531 while (up) {
532 struct zilog_channel __iomem *channel
533 = ZILOG_CHANNEL_FROM_PORT(&up->port);
534 struct tty_struct *tty;
535 unsigned char r3;
536
537 spin_lock(&up->port.lock);
538 r3 = read_zsreg(channel, R3);
539
540 /* Channel A */
541 tty = NULL;
542 if (r3 & (CHAEXT | CHATxIP | CHARxIP)) {
543 sbus_writeb(RES_H_IUS, &channel->control);
544 ZSDELAY();
545 ZS_WSYNC(channel);
546
547 if (r3 & CHARxIP)
548 tty = sunzilog_receive_chars(up, channel, regs);
549 if (r3 & CHAEXT)
550 sunzilog_status_handle(up, channel, regs);
551 if (r3 & CHATxIP)
552 sunzilog_transmit_chars(up, channel);
553 }
554 spin_unlock(&up->port.lock);
555
556 if (tty)
557 tty_flip_buffer_push(tty);
558
559 /* Channel B */
560 up = up->next;
561 channel = ZILOG_CHANNEL_FROM_PORT(&up->port);
562
563 spin_lock(&up->port.lock);
564 tty = NULL;
565 if (r3 & (CHBEXT | CHBTxIP | CHBRxIP)) {
566 sbus_writeb(RES_H_IUS, &channel->control);
567 ZSDELAY();
568 ZS_WSYNC(channel);
569
570 if (r3 & CHBRxIP)
571 tty = sunzilog_receive_chars(up, channel, regs);
572 if (r3 & CHBEXT)
573 sunzilog_status_handle(up, channel, regs);
574 if (r3 & CHBTxIP)
575 sunzilog_transmit_chars(up, channel);
576 }
577 spin_unlock(&up->port.lock);
578
579 if (tty)
580 tty_flip_buffer_push(tty);
581
582 up = up->next;
583 }
584
585 return IRQ_HANDLED;
586 }
587
588 /* A convenient way to quickly get R0 status. The caller must _not_ hold the
589 * port lock, it is acquired here.
590 */
591 static __inline__ unsigned char sunzilog_read_channel_status(struct uart_port *port)
592 {
593 struct zilog_channel __iomem *channel;
594 unsigned char status;
595
596 channel = ZILOG_CHANNEL_FROM_PORT(port);
597 status = sbus_readb(&channel->control);
598 ZSDELAY();
599
600 return status;
601 }
602
603 /* The port lock is not held. */
604 static unsigned int sunzilog_tx_empty(struct uart_port *port)
605 {
606 unsigned long flags;
607 unsigned char status;
608 unsigned int ret;
609
610 spin_lock_irqsave(&port->lock, flags);
611
612 status = sunzilog_read_channel_status(port);
613
614 spin_unlock_irqrestore(&port->lock, flags);
615
616 if (status & Tx_BUF_EMP)
617 ret = TIOCSER_TEMT;
618 else
619 ret = 0;
620
621 return ret;
622 }
623
624 /* The port lock is held and interrupts are disabled. */
625 static unsigned int sunzilog_get_mctrl(struct uart_port *port)
626 {
627 unsigned char status;
628 unsigned int ret;
629
630 status = sunzilog_read_channel_status(port);
631
632 ret = 0;
633 if (status & DCD)
634 ret |= TIOCM_CAR;
635 if (status & SYNC)
636 ret |= TIOCM_DSR;
637 if (status & CTS)
638 ret |= TIOCM_CTS;
639
640 return ret;
641 }
642
643 /* The port lock is held and interrupts are disabled. */
644 static void sunzilog_set_mctrl(struct uart_port *port, unsigned int mctrl)
645 {
646 struct uart_sunzilog_port *up = (struct uart_sunzilog_port *) port;
647 struct zilog_channel __iomem *channel = ZILOG_CHANNEL_FROM_PORT(port);
648 unsigned char set_bits, clear_bits;
649
650 set_bits = clear_bits = 0;
651
652 if (mctrl & TIOCM_RTS)
653 set_bits |= RTS;
654 else
655 clear_bits |= RTS;
656 if (mctrl & TIOCM_DTR)
657 set_bits |= DTR;
658 else
659 clear_bits |= DTR;
660
661 /* NOTE: Not subject to 'transmitter active' rule. */
662 up->curregs[R5] |= set_bits;
663 up->curregs[R5] &= ~clear_bits;
664 write_zsreg(channel, R5, up->curregs[R5]);
665 }
666
667 /* The port lock is held and interrupts are disabled. */
668 static void sunzilog_stop_tx(struct uart_port *port)
669 {
670 struct uart_sunzilog_port *up = (struct uart_sunzilog_port *) port;
671
672 up->flags |= SUNZILOG_FLAG_TX_STOPPED;
673 }
674
675 /* The port lock is held and interrupts are disabled. */
676 static void sunzilog_start_tx(struct uart_port *port)
677 {
678 struct uart_sunzilog_port *up = (struct uart_sunzilog_port *) port;
679 struct zilog_channel __iomem *channel = ZILOG_CHANNEL_FROM_PORT(port);
680 unsigned char status;
681
682 up->flags |= SUNZILOG_FLAG_TX_ACTIVE;
683 up->flags &= ~SUNZILOG_FLAG_TX_STOPPED;
684
685 status = sbus_readb(&channel->control);
686 ZSDELAY();
687
688 /* TX busy? Just wait for the TX done interrupt. */
689 if (!(status & Tx_BUF_EMP))
690 return;
691
692 /* Send the first character to jump-start the TX done
693 * IRQ sending engine.
694 */
695 if (port->x_char) {
696 sbus_writeb(port->x_char, &channel->data);
697 ZSDELAY();
698 ZS_WSYNC(channel);
699
700 port->icount.tx++;
701 port->x_char = 0;
702 } else {
703 struct circ_buf *xmit = &port->info->xmit;
704
705 sbus_writeb(xmit->buf[xmit->tail], &channel->data);
706 ZSDELAY();
707 ZS_WSYNC(channel);
708
709 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
710 port->icount.tx++;
711
712 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
713 uart_write_wakeup(&up->port);
714 }
715 }
716
717 /* The port lock is held. */
718 static void sunzilog_stop_rx(struct uart_port *port)
719 {
720 struct uart_sunzilog_port *up = UART_ZILOG(port);
721 struct zilog_channel __iomem *channel;
722
723 if (ZS_IS_CONS(up))
724 return;
725
726 channel = ZILOG_CHANNEL_FROM_PORT(port);
727
728 /* Disable all RX interrupts. */
729 up->curregs[R1] &= ~RxINT_MASK;
730 sunzilog_maybe_update_regs(up, channel);
731 }
732
733 /* The port lock is held. */
734 static void sunzilog_enable_ms(struct uart_port *port)
735 {
736 struct uart_sunzilog_port *up = (struct uart_sunzilog_port *) port;
737 struct zilog_channel __iomem *channel = ZILOG_CHANNEL_FROM_PORT(port);
738 unsigned char new_reg;
739
740 new_reg = up->curregs[R15] | (DCDIE | SYNCIE | CTSIE);
741 if (new_reg != up->curregs[R15]) {
742 up->curregs[R15] = new_reg;
743
744 /* NOTE: Not subject to 'transmitter active' rule. */
745 write_zsreg(channel, R15, up->curregs[R15]);
746 }
747 }
748
749 /* The port lock is not held. */
750 static void sunzilog_break_ctl(struct uart_port *port, int break_state)
751 {
752 struct uart_sunzilog_port *up = (struct uart_sunzilog_port *) port;
753 struct zilog_channel __iomem *channel = ZILOG_CHANNEL_FROM_PORT(port);
754 unsigned char set_bits, clear_bits, new_reg;
755 unsigned long flags;
756
757 set_bits = clear_bits = 0;
758
759 if (break_state)
760 set_bits |= SND_BRK;
761 else
762 clear_bits |= SND_BRK;
763
764 spin_lock_irqsave(&port->lock, flags);
765
766 new_reg = (up->curregs[R5] | set_bits) & ~clear_bits;
767 if (new_reg != up->curregs[R5]) {
768 up->curregs[R5] = new_reg;
769
770 /* NOTE: Not subject to 'transmitter active' rule. */
771 write_zsreg(channel, R5, up->curregs[R5]);
772 }
773
774 spin_unlock_irqrestore(&port->lock, flags);
775 }
776
777 static void __sunzilog_startup(struct uart_sunzilog_port *up)
778 {
779 struct zilog_channel __iomem *channel;
780
781 channel = ZILOG_CHANNEL_FROM_PORT(&up->port);
782 up->prev_status = sbus_readb(&channel->control);
783
784 /* Enable receiver and transmitter. */
785 up->curregs[R3] |= RxENAB;
786 up->curregs[R5] |= TxENAB;
787
788 up->curregs[R1] |= EXT_INT_ENAB | INT_ALL_Rx | TxINT_ENAB;
789 sunzilog_maybe_update_regs(up, channel);
790 }
791
792 static int sunzilog_startup(struct uart_port *port)
793 {
794 struct uart_sunzilog_port *up = UART_ZILOG(port);
795 unsigned long flags;
796
797 if (ZS_IS_CONS(up))
798 return 0;
799
800 spin_lock_irqsave(&port->lock, flags);
801 __sunzilog_startup(up);
802 spin_unlock_irqrestore(&port->lock, flags);
803 return 0;
804 }
805
806 /*
807 * The test for ZS_IS_CONS is explained by the following e-mail:
808 *****
809 * From: Russell King <rmk@arm.linux.org.uk>
810 * Date: Sun, 8 Dec 2002 10:18:38 +0000
811 *
812 * On Sun, Dec 08, 2002 at 02:43:36AM -0500, Pete Zaitcev wrote:
813 * > I boot my 2.5 boxes using "console=ttyS0,9600" argument,
814 * > and I noticed that something is not right with reference
815 * > counting in this case. It seems that when the console
816 * > is open by kernel initially, this is not accounted
817 * > as an open, and uart_startup is not called.
818 *
819 * That is correct. We are unable to call uart_startup when the serial
820 * console is initialised because it may need to allocate memory (as
821 * request_irq does) and the memory allocators may not have been
822 * initialised.
823 *
824 * 1. initialise the port into a state where it can send characters in the
825 * console write method.
826 *
827 * 2. don't do the actual hardware shutdown in your shutdown() method (but
828 * do the normal software shutdown - ie, free irqs etc)
829 *****
830 */
831 static void sunzilog_shutdown(struct uart_port *port)
832 {
833 struct uart_sunzilog_port *up = UART_ZILOG(port);
834 struct zilog_channel __iomem *channel;
835 unsigned long flags;
836
837 if (ZS_IS_CONS(up))
838 return;
839
840 spin_lock_irqsave(&port->lock, flags);
841
842 channel = ZILOG_CHANNEL_FROM_PORT(port);
843
844 /* Disable receiver and transmitter. */
845 up->curregs[R3] &= ~RxENAB;
846 up->curregs[R5] &= ~TxENAB;
847
848 /* Disable all interrupts and BRK assertion. */
849 up->curregs[R1] &= ~(EXT_INT_ENAB | TxINT_ENAB | RxINT_MASK);
850 up->curregs[R5] &= ~SND_BRK;
851 sunzilog_maybe_update_regs(up, channel);
852
853 spin_unlock_irqrestore(&port->lock, flags);
854 }
855
856 /* Shared by TTY driver and serial console setup. The port lock is held
857 * and local interrupts are disabled.
858 */
859 static void
860 sunzilog_convert_to_zs(struct uart_sunzilog_port *up, unsigned int cflag,
861 unsigned int iflag, int brg)
862 {
863
864 up->curregs[R10] = NRZ;
865 up->curregs[R11] = TCBR | RCBR;
866
867 /* Program BAUD and clock source. */
868 up->curregs[R4] &= ~XCLK_MASK;
869 up->curregs[R4] |= X16CLK;
870 up->curregs[R12] = brg & 0xff;
871 up->curregs[R13] = (brg >> 8) & 0xff;
872 up->curregs[R14] = BRSRC | BRENAB;
873
874 /* Character size, stop bits, and parity. */
875 up->curregs[3] &= ~RxN_MASK;
876 up->curregs[5] &= ~TxN_MASK;
877 switch (cflag & CSIZE) {
878 case CS5:
879 up->curregs[3] |= Rx5;
880 up->curregs[5] |= Tx5;
881 up->parity_mask = 0x1f;
882 break;
883 case CS6:
884 up->curregs[3] |= Rx6;
885 up->curregs[5] |= Tx6;
886 up->parity_mask = 0x3f;
887 break;
888 case CS7:
889 up->curregs[3] |= Rx7;
890 up->curregs[5] |= Tx7;
891 up->parity_mask = 0x7f;
892 break;
893 case CS8:
894 default:
895 up->curregs[3] |= Rx8;
896 up->curregs[5] |= Tx8;
897 up->parity_mask = 0xff;
898 break;
899 };
900 up->curregs[4] &= ~0x0c;
901 if (cflag & CSTOPB)
902 up->curregs[4] |= SB2;
903 else
904 up->curregs[4] |= SB1;
905 if (cflag & PARENB)
906 up->curregs[4] |= PAR_ENAB;
907 else
908 up->curregs[4] &= ~PAR_ENAB;
909 if (!(cflag & PARODD))
910 up->curregs[4] |= PAR_EVEN;
911 else
912 up->curregs[4] &= ~PAR_EVEN;
913
914 up->port.read_status_mask = Rx_OVR;
915 if (iflag & INPCK)
916 up->port.read_status_mask |= CRC_ERR | PAR_ERR;
917 if (iflag & (BRKINT | PARMRK))
918 up->port.read_status_mask |= BRK_ABRT;
919
920 up->port.ignore_status_mask = 0;
921 if (iflag & IGNPAR)
922 up->port.ignore_status_mask |= CRC_ERR | PAR_ERR;
923 if (iflag & IGNBRK) {
924 up->port.ignore_status_mask |= BRK_ABRT;
925 if (iflag & IGNPAR)
926 up->port.ignore_status_mask |= Rx_OVR;
927 }
928
929 if ((cflag & CREAD) == 0)
930 up->port.ignore_status_mask = 0xff;
931 }
932
933 /* The port lock is not held. */
934 static void
935 sunzilog_set_termios(struct uart_port *port, struct termios *termios,
936 struct termios *old)
937 {
938 struct uart_sunzilog_port *up = (struct uart_sunzilog_port *) port;
939 unsigned long flags;
940 int baud, brg;
941
942 baud = uart_get_baud_rate(port, termios, old, 1200, 76800);
943
944 spin_lock_irqsave(&up->port.lock, flags);
945
946 brg = BPS_TO_BRG(baud, ZS_CLOCK / ZS_CLOCK_DIVISOR);
947
948 sunzilog_convert_to_zs(up, termios->c_cflag, termios->c_iflag, brg);
949
950 if (UART_ENABLE_MS(&up->port, termios->c_cflag))
951 up->flags |= SUNZILOG_FLAG_MODEM_STATUS;
952 else
953 up->flags &= ~SUNZILOG_FLAG_MODEM_STATUS;
954
955 up->cflag = termios->c_cflag;
956
957 sunzilog_maybe_update_regs(up, ZILOG_CHANNEL_FROM_PORT(port));
958
959 uart_update_timeout(port, termios->c_cflag, baud);
960
961 spin_unlock_irqrestore(&up->port.lock, flags);
962 }
963
964 static const char *sunzilog_type(struct uart_port *port)
965 {
966 return "SunZilog";
967 }
968
969 /* We do not request/release mappings of the registers here, this
970 * happens at early serial probe time.
971 */
972 static void sunzilog_release_port(struct uart_port *port)
973 {
974 }
975
976 static int sunzilog_request_port(struct uart_port *port)
977 {
978 return 0;
979 }
980
981 /* These do not need to do anything interesting either. */
982 static void sunzilog_config_port(struct uart_port *port, int flags)
983 {
984 }
985
986 /* We do not support letting the user mess with the divisor, IRQ, etc. */
987 static int sunzilog_verify_port(struct uart_port *port, struct serial_struct *ser)
988 {
989 return -EINVAL;
990 }
991
992 static struct uart_ops sunzilog_pops = {
993 .tx_empty = sunzilog_tx_empty,
994 .set_mctrl = sunzilog_set_mctrl,
995 .get_mctrl = sunzilog_get_mctrl,
996 .stop_tx = sunzilog_stop_tx,
997 .start_tx = sunzilog_start_tx,
998 .stop_rx = sunzilog_stop_rx,
999 .enable_ms = sunzilog_enable_ms,
1000 .break_ctl = sunzilog_break_ctl,
1001 .startup = sunzilog_startup,
1002 .shutdown = sunzilog_shutdown,
1003 .set_termios = sunzilog_set_termios,
1004 .type = sunzilog_type,
1005 .release_port = sunzilog_release_port,
1006 .request_port = sunzilog_request_port,
1007 .config_port = sunzilog_config_port,
1008 .verify_port = sunzilog_verify_port,
1009 };
1010
1011 static struct uart_sunzilog_port *sunzilog_port_table;
1012 static struct zilog_layout __iomem **sunzilog_chip_regs;
1013
1014 static struct uart_sunzilog_port *sunzilog_irq_chain;
1015 static int zilog_irq = -1;
1016
1017 static struct uart_driver sunzilog_reg = {
1018 .owner = THIS_MODULE,
1019 .driver_name = "ttyS",
1020 .devfs_name = "tts/",
1021 .dev_name = "ttyS",
1022 .major = TTY_MAJOR,
1023 };
1024
1025 static void * __init alloc_one_table(unsigned long size)
1026 {
1027 void *ret;
1028
1029 ret = kmalloc(size, GFP_KERNEL);
1030 if (ret != NULL)
1031 memset(ret, 0, size);
1032
1033 return ret;
1034 }
1035
1036 static void __init sunzilog_alloc_tables(void)
1037 {
1038 sunzilog_port_table =
1039 alloc_one_table(NUM_CHANNELS * sizeof(struct uart_sunzilog_port));
1040 sunzilog_chip_regs =
1041 alloc_one_table(NUM_SUNZILOG * sizeof(struct zilog_layout __iomem *));
1042
1043 if (sunzilog_port_table == NULL || sunzilog_chip_regs == NULL) {
1044 prom_printf("SunZilog: Cannot allocate tables.\n");
1045 prom_halt();
1046 }
1047 }
1048
1049 #ifdef CONFIG_SPARC64
1050
1051 /* We used to attempt to use the address property of the Zilog device node
1052 * but that totally is not necessary on sparc64.
1053 */
1054 static struct zilog_layout __iomem * __init get_zs_sun4u(int chip, int zsnode)
1055 {
1056 void __iomem *mapped_addr;
1057 unsigned int sun4u_ino;
1058 struct sbus_bus *sbus = NULL;
1059 struct sbus_dev *sdev = NULL;
1060 int err;
1061
1062 if (central_bus == NULL) {
1063 for_each_sbus(sbus) {
1064 for_each_sbusdev(sdev, sbus) {
1065 if (sdev->prom_node == zsnode)
1066 goto found;
1067 }
1068 }
1069 }
1070 found:
1071 if (sdev == NULL && central_bus == NULL) {
1072 prom_printf("SunZilog: sdev&&central == NULL for "
1073 "Zilog %d in get_zs_sun4u.\n", chip);
1074 prom_halt();
1075 }
1076 if (central_bus == NULL) {
1077 mapped_addr =
1078 sbus_ioremap(&sdev->resource[0], 0,
1079 PAGE_SIZE,
1080 "Zilog Registers");
1081 } else {
1082 struct linux_prom_registers zsregs[1];
1083
1084 err = prom_getproperty(zsnode, "reg",
1085 (char *) &zsregs[0],
1086 sizeof(zsregs));
1087 if (err == -1) {
1088 prom_printf("SunZilog: Cannot map "
1089 "Zilog %d regs on "
1090 "central bus.\n", chip);
1091 prom_halt();
1092 }
1093 apply_fhc_ranges(central_bus->child,
1094 &zsregs[0], 1);
1095 apply_central_ranges(central_bus, &zsregs[0], 1);
1096 mapped_addr = (void __iomem *)
1097 ((((u64)zsregs[0].which_io)<<32UL) |
1098 ((u64)zsregs[0].phys_addr));
1099 }
1100
1101 if (zilog_irq == -1) {
1102 if (central_bus) {
1103 unsigned long iclr, imap;
1104
1105 iclr = central_bus->child->fhc_regs.uregs
1106 + FHC_UREGS_ICLR;
1107 imap = central_bus->child->fhc_regs.uregs
1108 + FHC_UREGS_IMAP;
1109 zilog_irq = build_irq(12, 0, iclr, imap);
1110 } else {
1111 err = prom_getproperty(zsnode, "interrupts",
1112 (char *) &sun4u_ino,
1113 sizeof(sun4u_ino));
1114 zilog_irq = sbus_build_irq(sbus_root, sun4u_ino);
1115 }
1116 }
1117
1118 return (struct zilog_layout __iomem *) mapped_addr;
1119 }
1120 #else /* CONFIG_SPARC64 */
1121
1122 /*
1123 * XXX The sun4d case is utterly screwed: it tries to re-walk the tree
1124 * (for the 3rd time) in order to find bootbus and cpu. Streamline it.
1125 */
1126 static struct zilog_layout __iomem * __init get_zs_sun4cmd(int chip, int node)
1127 {
1128 struct linux_prom_irqs irq_info[2];
1129 void __iomem *mapped_addr = NULL;
1130 int zsnode, cpunode, bbnode;
1131 struct linux_prom_registers zsreg[4];
1132 struct resource res;
1133
1134 if (sparc_cpu_model == sun4d) {
1135 int walk;
1136
1137 zsnode = 0;
1138 bbnode = 0;
1139 cpunode = 0;
1140 for (walk = prom_getchild(prom_root_node);
1141 (walk = prom_searchsiblings(walk, "cpu-unit")) != 0;
1142 walk = prom_getsibling(walk)) {
1143 bbnode = prom_getchild(walk);
1144 if (bbnode &&
1145 (bbnode = prom_searchsiblings(bbnode, "bootbus"))) {
1146 if ((zsnode = prom_getchild(bbnode)) == node) {
1147 cpunode = walk;
1148 break;
1149 }
1150 }
1151 }
1152 if (!walk) {
1153 prom_printf("SunZilog: Cannot find the %d'th bootbus on sun4d.\n",
1154 (chip / 2));
1155 prom_halt();
1156 }
1157
1158 if (prom_getproperty(zsnode, "reg",
1159 (char *) zsreg, sizeof(zsreg)) == -1) {
1160 prom_printf("SunZilog: Cannot map Zilog %d\n", chip);
1161 prom_halt();
1162 }
1163 /* XXX Looks like an off by one? */
1164 prom_apply_generic_ranges(bbnode, cpunode, zsreg, 1);
1165 res.start = zsreg[0].phys_addr;
1166 res.end = res.start + (8 - 1);
1167 res.flags = zsreg[0].which_io | IORESOURCE_IO;
1168 mapped_addr = sbus_ioremap(&res, 0, 8, "Zilog Serial");
1169
1170 } else {
1171 zsnode = node;
1172
1173 #if 0 /* XXX When was this used? */
1174 if (prom_getintdefault(zsnode, "slave", -1) != chipid) {
1175 zsnode = prom_getsibling(zsnode);
1176 continue;
1177 }
1178 #endif
1179
1180 /*
1181 * "address" is only present on ports that OBP opened
1182 * (from Mitch Bradley's "Hitchhiker's Guide to OBP").
1183 * We do not use it.
1184 */
1185
1186 if (prom_getproperty(zsnode, "reg",
1187 (char *) zsreg, sizeof(zsreg)) == -1) {
1188 prom_printf("SunZilog: Cannot map Zilog %d\n", chip);
1189 prom_halt();
1190 }
1191 if (sparc_cpu_model == sun4m) /* Crude. Pass parent. XXX */
1192 prom_apply_obio_ranges(zsreg, 1);
1193 res.start = zsreg[0].phys_addr;
1194 res.end = res.start + (8 - 1);
1195 res.flags = zsreg[0].which_io | IORESOURCE_IO;
1196 mapped_addr = sbus_ioremap(&res, 0, 8, "Zilog Serial");
1197 }
1198
1199 if (prom_getproperty(zsnode, "intr",
1200 (char *) irq_info, sizeof(irq_info))
1201 % sizeof(struct linux_prom_irqs)) {
1202 prom_printf("SunZilog: Cannot get IRQ property for Zilog %d.\n",
1203 chip);
1204 prom_halt();
1205 }
1206 if (zilog_irq == -1) {
1207 zilog_irq = irq_info[0].pri;
1208 } else if (zilog_irq != irq_info[0].pri) {
1209 /* XXX. Dumb. Should handle per-chip IRQ, for add-ons. */
1210 prom_printf("SunZilog: Inconsistent IRQ layout for Zilog %d.\n",
1211 chip);
1212 prom_halt();
1213 }
1214
1215 return (struct zilog_layout __iomem *) mapped_addr;
1216 }
1217 #endif /* !(CONFIG_SPARC64) */
1218
1219 /* Get the address of the registers for SunZilog instance CHIP. */
1220 static struct zilog_layout __iomem * __init get_zs(int chip, int node)
1221 {
1222 if (chip < 0 || chip >= NUM_SUNZILOG) {
1223 prom_printf("SunZilog: Illegal chip number %d in get_zs.\n", chip);
1224 prom_halt();
1225 }
1226
1227 #ifdef CONFIG_SPARC64
1228 return get_zs_sun4u(chip, node);
1229 #else
1230
1231 if (sparc_cpu_model == sun4) {
1232 struct resource res;
1233
1234 /* Not probe-able, hard code it. */
1235 switch (chip) {
1236 case 0:
1237 res.start = 0xf1000000;
1238 break;
1239 case 1:
1240 res.start = 0xf0000000;
1241 break;
1242 };
1243 zilog_irq = 12;
1244 res.end = (res.start + (8 - 1));
1245 res.flags = IORESOURCE_IO;
1246 return sbus_ioremap(&res, 0, 8, "SunZilog");
1247 }
1248
1249 return get_zs_sun4cmd(chip, node);
1250 #endif
1251 }
1252
1253 #define ZS_PUT_CHAR_MAX_DELAY 2000 /* 10 ms */
1254
1255 static void sunzilog_put_char(struct zilog_channel __iomem *channel, unsigned char ch)
1256 {
1257 int loops = ZS_PUT_CHAR_MAX_DELAY;
1258
1259 /* This is a timed polling loop so do not switch the explicit
1260 * udelay with ZSDELAY as that is a NOP on some platforms. -DaveM
1261 */
1262 do {
1263 unsigned char val = sbus_readb(&channel->control);
1264 if (val & Tx_BUF_EMP) {
1265 ZSDELAY();
1266 break;
1267 }
1268 udelay(5);
1269 } while (--loops);
1270
1271 sbus_writeb(ch, &channel->data);
1272 ZSDELAY();
1273 ZS_WSYNC(channel);
1274 }
1275
1276 #ifdef CONFIG_SERIO
1277
1278 static DEFINE_SPINLOCK(sunzilog_serio_lock);
1279
1280 static int sunzilog_serio_write(struct serio *serio, unsigned char ch)
1281 {
1282 struct uart_sunzilog_port *up = serio->port_data;
1283 unsigned long flags;
1284
1285 spin_lock_irqsave(&sunzilog_serio_lock, flags);
1286
1287 sunzilog_put_char(ZILOG_CHANNEL_FROM_PORT(&up->port), ch);
1288
1289 spin_unlock_irqrestore(&sunzilog_serio_lock, flags);
1290
1291 return 0;
1292 }
1293
1294 static int sunzilog_serio_open(struct serio *serio)
1295 {
1296 struct uart_sunzilog_port *up = serio->port_data;
1297 unsigned long flags;
1298 int ret;
1299
1300 spin_lock_irqsave(&sunzilog_serio_lock, flags);
1301 if (!up->serio_open) {
1302 up->serio_open = 1;
1303 ret = 0;
1304 } else
1305 ret = -EBUSY;
1306 spin_unlock_irqrestore(&sunzilog_serio_lock, flags);
1307
1308 return ret;
1309 }
1310
1311 static void sunzilog_serio_close(struct serio *serio)
1312 {
1313 struct uart_sunzilog_port *up = serio->port_data;
1314 unsigned long flags;
1315
1316 spin_lock_irqsave(&sunzilog_serio_lock, flags);
1317 up->serio_open = 0;
1318 spin_unlock_irqrestore(&sunzilog_serio_lock, flags);
1319 }
1320
1321 #endif /* CONFIG_SERIO */
1322
1323 #ifdef CONFIG_SERIAL_SUNZILOG_CONSOLE
1324 static void
1325 sunzilog_console_write(struct console *con, const char *s, unsigned int count)
1326 {
1327 struct uart_sunzilog_port *up = &sunzilog_port_table[con->index];
1328 struct zilog_channel *channel = ZILOG_CHANNEL_FROM_PORT(&up->port);
1329 unsigned long flags;
1330 int i;
1331
1332 spin_lock_irqsave(&up->port.lock, flags);
1333 for (i = 0; i < count; i++, s++) {
1334 sunzilog_put_char(channel, *s);
1335 if (*s == 10)
1336 sunzilog_put_char(channel, 13);
1337 }
1338 udelay(2);
1339 spin_unlock_irqrestore(&up->port.lock, flags);
1340 }
1341
1342 static int __init sunzilog_console_setup(struct console *con, char *options)
1343 {
1344 struct uart_sunzilog_port *up = &sunzilog_port_table[con->index];
1345 unsigned long flags;
1346 int baud, brg;
1347
1348 printk(KERN_INFO "Console: ttyS%d (SunZilog zs%d)\n",
1349 (sunzilog_reg.minor - 64) + con->index, con->index);
1350
1351 /* Get firmware console settings. */
1352 sunserial_console_termios(con);
1353
1354 /* Firmware console speed is limited to 150-->38400 baud so
1355 * this hackish cflag thing is OK.
1356 */
1357 switch (con->cflag & CBAUD) {
1358 case B150: baud = 150; break;
1359 case B300: baud = 300; break;
1360 case B600: baud = 600; break;
1361 case B1200: baud = 1200; break;
1362 case B2400: baud = 2400; break;
1363 case B4800: baud = 4800; break;
1364 default: case B9600: baud = 9600; break;
1365 case B19200: baud = 19200; break;
1366 case B38400: baud = 38400; break;
1367 };
1368
1369 brg = BPS_TO_BRG(baud, ZS_CLOCK / ZS_CLOCK_DIVISOR);
1370
1371 spin_lock_irqsave(&up->port.lock, flags);
1372
1373 up->curregs[R15] = BRKIE;
1374 sunzilog_convert_to_zs(up, con->cflag, 0, brg);
1375
1376 sunzilog_set_mctrl(&up->port, TIOCM_DTR | TIOCM_RTS);
1377 __sunzilog_startup(up);
1378
1379 spin_unlock_irqrestore(&up->port.lock, flags);
1380
1381 return 0;
1382 }
1383
1384 static struct console sunzilog_console = {
1385 .name = "ttyS",
1386 .write = sunzilog_console_write,
1387 .device = uart_console_device,
1388 .setup = sunzilog_console_setup,
1389 .flags = CON_PRINTBUFFER,
1390 .index = -1,
1391 .data = &sunzilog_reg,
1392 };
1393 #define SUNZILOG_CONSOLE (&sunzilog_console)
1394
1395 static int __init sunzilog_console_init(void)
1396 {
1397 int i;
1398
1399 if (con_is_present())
1400 return 0;
1401
1402 for (i = 0; i < NUM_CHANNELS; i++) {
1403 int this_minor = sunzilog_reg.minor + i;
1404
1405 if ((this_minor - 64) == (serial_console - 1))
1406 break;
1407 }
1408 if (i == NUM_CHANNELS)
1409 return 0;
1410
1411 sunzilog_console.index = i;
1412 sunzilog_port_table[i].flags |= SUNZILOG_FLAG_IS_CONS;
1413 register_console(&sunzilog_console);
1414 return 0;
1415 }
1416 #else
1417 #define SUNZILOG_CONSOLE (NULL)
1418 #define sunzilog_console_init() do { } while (0)
1419 #endif
1420
1421 /*
1422 * We scan the PROM tree recursively. This is the most reliable way
1423 * to find Zilog nodes on various platforms. However, we face an extreme
1424 * shortage of kernel stack, so we must be very careful. To that end,
1425 * we scan only to a certain depth, and we use a common property buffer
1426 * in the scan structure.
1427 */
1428 #define ZS_PROPSIZE 128
1429 #define ZS_SCAN_DEPTH 5
1430
1431 struct zs_probe_scan {
1432 int depth;
1433 void (*scanner)(struct zs_probe_scan *t, int node);
1434
1435 int devices;
1436 char prop[ZS_PROPSIZE];
1437 };
1438
1439 static int __inline__ sunzilog_node_ok(int node, const char *name, int len)
1440 {
1441 if (strncmp(name, "zs", len) == 0)
1442 return 1;
1443 /* Don't fold this procedure just yet. Compare to su_node_ok(). */
1444 return 0;
1445 }
1446
1447 static void __init sunzilog_scan(struct zs_probe_scan *t, int node)
1448 {
1449 int len;
1450
1451 for (; node != 0; node = prom_getsibling(node)) {
1452 len = prom_getproperty(node, "name", t->prop, ZS_PROPSIZE);
1453 if (len <= 1)
1454 continue; /* Broken PROM node */
1455 if (sunzilog_node_ok(node, t->prop, len)) {
1456 (*t->scanner)(t, node);
1457 } else {
1458 if (t->depth < ZS_SCAN_DEPTH) {
1459 t->depth++;
1460 sunzilog_scan(t, prom_getchild(node));
1461 --t->depth;
1462 }
1463 }
1464 }
1465 }
1466
1467 static void __init sunzilog_prepare(void)
1468 {
1469 struct uart_sunzilog_port *up;
1470 struct zilog_layout __iomem *rp;
1471 int channel, chip;
1472
1473 /*
1474 * Temporary fix.
1475 */
1476 for (channel = 0; channel < NUM_CHANNELS; channel++)
1477 spin_lock_init(&sunzilog_port_table[channel].port.lock);
1478
1479 sunzilog_irq_chain = up = &sunzilog_port_table[0];
1480 for (channel = 0; channel < NUM_CHANNELS - 1; channel++)
1481 up[channel].next = &up[channel + 1];
1482 up[channel].next = NULL;
1483
1484 for (chip = 0; chip < NUM_SUNZILOG; chip++) {
1485 rp = sunzilog_chip_regs[chip];
1486 up[(chip * 2) + 0].port.membase = (void __iomem *)&rp->channelA;
1487 up[(chip * 2) + 1].port.membase = (void __iomem *)&rp->channelB;
1488
1489 /* Channel A */
1490 up[(chip * 2) + 0].port.iotype = UPIO_MEM;
1491 up[(chip * 2) + 0].port.irq = zilog_irq;
1492 up[(chip * 2) + 0].port.uartclk = ZS_CLOCK;
1493 up[(chip * 2) + 0].port.fifosize = 1;
1494 up[(chip * 2) + 0].port.ops = &sunzilog_pops;
1495 up[(chip * 2) + 0].port.type = PORT_SUNZILOG;
1496 up[(chip * 2) + 0].port.flags = 0;
1497 up[(chip * 2) + 0].port.line = (chip * 2) + 0;
1498 up[(chip * 2) + 0].flags |= SUNZILOG_FLAG_IS_CHANNEL_A;
1499
1500 /* Channel B */
1501 up[(chip * 2) + 1].port.iotype = UPIO_MEM;
1502 up[(chip * 2) + 1].port.irq = zilog_irq;
1503 up[(chip * 2) + 1].port.uartclk = ZS_CLOCK;
1504 up[(chip * 2) + 1].port.fifosize = 1;
1505 up[(chip * 2) + 1].port.ops = &sunzilog_pops;
1506 up[(chip * 2) + 1].port.type = PORT_SUNZILOG;
1507 up[(chip * 2) + 1].port.flags = 0;
1508 up[(chip * 2) + 1].port.line = (chip * 2) + 1;
1509 up[(chip * 2) + 1].flags |= 0;
1510 }
1511 }
1512
1513 static void __init sunzilog_init_kbdms(struct uart_sunzilog_port *up, int channel)
1514 {
1515 int baud, brg;
1516
1517 if (channel == KEYBOARD_LINE) {
1518 up->flags |= SUNZILOG_FLAG_CONS_KEYB;
1519 up->cflag = B1200 | CS8 | CLOCAL | CREAD;
1520 baud = 1200;
1521 } else {
1522 up->flags |= SUNZILOG_FLAG_CONS_MOUSE;
1523 up->cflag = B4800 | CS8 | CLOCAL | CREAD;
1524 baud = 4800;
1525 }
1526 printk(KERN_INFO "zs%d at 0x%p (irq = %s) is a SunZilog\n",
1527 channel, up->port.membase, __irq_itoa(zilog_irq));
1528
1529 up->curregs[R15] = BRKIE;
1530 brg = BPS_TO_BRG(baud, ZS_CLOCK / ZS_CLOCK_DIVISOR);
1531 sunzilog_convert_to_zs(up, up->cflag, 0, brg);
1532 sunzilog_set_mctrl(&up->port, TIOCM_DTR | TIOCM_RTS);
1533 __sunzilog_startup(up);
1534 }
1535
1536 #ifdef CONFIG_SERIO
1537 static void __init sunzilog_register_serio(struct uart_sunzilog_port *up, int channel)
1538 {
1539 struct serio *serio;
1540
1541 up->serio = serio = kmalloc(sizeof(struct serio), GFP_KERNEL);
1542 if (serio) {
1543 memset(serio, 0, sizeof(*serio));
1544
1545 serio->port_data = up;
1546
1547 serio->id.type = SERIO_RS232;
1548 if (channel == KEYBOARD_LINE) {
1549 serio->id.proto = SERIO_SUNKBD;
1550 strlcpy(serio->name, "zskbd", sizeof(serio->name));
1551 } else {
1552 serio->id.proto = SERIO_SUN;
1553 serio->id.extra = 1;
1554 strlcpy(serio->name, "zsms", sizeof(serio->name));
1555 }
1556 strlcpy(serio->phys,
1557 (channel == KEYBOARD_LINE ? "zs/serio0" : "zs/serio1"),
1558 sizeof(serio->phys));
1559
1560 serio->write = sunzilog_serio_write;
1561 serio->open = sunzilog_serio_open;
1562 serio->close = sunzilog_serio_close;
1563
1564 serio_register_port(serio);
1565 } else {
1566 printk(KERN_WARNING "zs%d: not enough memory for serio port\n",
1567 channel);
1568 }
1569 }
1570 #endif
1571
1572 static void __init sunzilog_init_hw(void)
1573 {
1574 int i;
1575
1576 for (i = 0; i < NUM_CHANNELS; i++) {
1577 struct uart_sunzilog_port *up = &sunzilog_port_table[i];
1578 struct zilog_channel __iomem *channel = ZILOG_CHANNEL_FROM_PORT(&up->port);
1579 unsigned long flags;
1580 int baud, brg;
1581
1582 spin_lock_irqsave(&up->port.lock, flags);
1583
1584 if (ZS_IS_CHANNEL_A(up)) {
1585 write_zsreg(channel, R9, FHWRES);
1586 ZSDELAY_LONG();
1587 (void) read_zsreg(channel, R0);
1588 }
1589
1590 if (i == KEYBOARD_LINE || i == MOUSE_LINE) {
1591 sunzilog_init_kbdms(up, i);
1592 up->curregs[R9] |= (NV | MIE);
1593 write_zsreg(channel, R9, up->curregs[R9]);
1594 } else {
1595 /* Normal serial TTY. */
1596 up->parity_mask = 0xff;
1597 up->curregs[R1] = EXT_INT_ENAB | INT_ALL_Rx | TxINT_ENAB;
1598 up->curregs[R4] = PAR_EVEN | X16CLK | SB1;
1599 up->curregs[R3] = RxENAB | Rx8;
1600 up->curregs[R5] = TxENAB | Tx8;
1601 up->curregs[R9] = NV | MIE;
1602 up->curregs[R10] = NRZ;
1603 up->curregs[R11] = TCBR | RCBR;
1604 baud = 9600;
1605 brg = BPS_TO_BRG(baud, ZS_CLOCK / ZS_CLOCK_DIVISOR);
1606 up->curregs[R12] = (brg & 0xff);
1607 up->curregs[R13] = (brg >> 8) & 0xff;
1608 up->curregs[R14] = BRSRC | BRENAB;
1609 __load_zsregs(channel, up->curregs);
1610 write_zsreg(channel, R9, up->curregs[R9]);
1611 }
1612
1613 spin_unlock_irqrestore(&up->port.lock, flags);
1614
1615 #ifdef CONFIG_SERIO
1616 if (i == KEYBOARD_LINE || i == MOUSE_LINE)
1617 sunzilog_register_serio(up, i);
1618 #endif
1619 }
1620 }
1621
1622 static struct zilog_layout __iomem * __init get_zs(int chip, int node);
1623
1624 static void __init sunzilog_scan_probe(struct zs_probe_scan *t, int node)
1625 {
1626 sunzilog_chip_regs[t->devices] = get_zs(t->devices, node);
1627 t->devices++;
1628 }
1629
1630 static int __init sunzilog_ports_init(void)
1631 {
1632 struct zs_probe_scan scan;
1633 int ret;
1634 int uart_count;
1635 int i;
1636
1637 printk(KERN_DEBUG "SunZilog: %d chips.\n", NUM_SUNZILOG);
1638
1639 scan.scanner = sunzilog_scan_probe;
1640 scan.depth = 0;
1641 scan.devices = 0;
1642 sunzilog_scan(&scan, prom_getchild(prom_root_node));
1643
1644 sunzilog_prepare();
1645
1646 if (request_irq(zilog_irq, sunzilog_interrupt, SA_SHIRQ,
1647 "SunZilog", sunzilog_irq_chain)) {
1648 prom_printf("SunZilog: Unable to register zs interrupt handler.\n");
1649 prom_halt();
1650 }
1651
1652 sunzilog_init_hw();
1653
1654 /* We can only init this once we have probed the Zilogs
1655 * in the system. Do not count channels assigned to keyboards
1656 * or mice when we are deciding how many ports to register.
1657 */
1658 uart_count = 0;
1659 for (i = 0; i < NUM_CHANNELS; i++) {
1660 struct uart_sunzilog_port *up = &sunzilog_port_table[i];
1661
1662 if (ZS_IS_KEYB(up) || ZS_IS_MOUSE(up))
1663 continue;
1664
1665 uart_count++;
1666 }
1667
1668 sunzilog_reg.nr = uart_count;
1669 sunzilog_reg.cons = SUNZILOG_CONSOLE;
1670
1671 sunzilog_reg.minor = sunserial_current_minor;
1672 sunserial_current_minor += uart_count;
1673
1674 ret = uart_register_driver(&sunzilog_reg);
1675 if (ret == 0) {
1676 sunzilog_console_init();
1677 for (i = 0; i < NUM_CHANNELS; i++) {
1678 struct uart_sunzilog_port *up = &sunzilog_port_table[i];
1679
1680 if (ZS_IS_KEYB(up) || ZS_IS_MOUSE(up))
1681 continue;
1682
1683 if (uart_add_one_port(&sunzilog_reg, &up->port)) {
1684 printk(KERN_ERR
1685 "SunZilog: failed to add port zs%d\n", i);
1686 }
1687 }
1688 }
1689
1690 return ret;
1691 }
1692
1693 static void __init sunzilog_scan_count(struct zs_probe_scan *t, int node)
1694 {
1695 t->devices++;
1696 }
1697
1698 static int __init sunzilog_ports_count(void)
1699 {
1700 struct zs_probe_scan scan;
1701
1702 /* Sun4 Zilog setup is hard coded, no probing to do. */
1703 if (sparc_cpu_model == sun4)
1704 return 2;
1705
1706 scan.scanner = sunzilog_scan_count;
1707 scan.depth = 0;
1708 scan.devices = 0;
1709
1710 sunzilog_scan(&scan, prom_getchild(prom_root_node));
1711
1712 return scan.devices;
1713 }
1714
1715 static int __init sunzilog_init(void)
1716 {
1717
1718 NUM_SUNZILOG = sunzilog_ports_count();
1719 if (NUM_SUNZILOG == 0)
1720 return -ENODEV;
1721
1722 sunzilog_alloc_tables();
1723
1724 sunzilog_ports_init();
1725
1726 return 0;
1727 }
1728
1729 static void __exit sunzilog_exit(void)
1730 {
1731 int i;
1732
1733 for (i = 0; i < NUM_CHANNELS; i++) {
1734 struct uart_sunzilog_port *up = &sunzilog_port_table[i];
1735
1736 if (ZS_IS_KEYB(up) || ZS_IS_MOUSE(up)) {
1737 #ifdef CONFIG_SERIO
1738 if (up->serio) {
1739 serio_unregister_port(up->serio);
1740 up->serio = NULL;
1741 }
1742 #endif
1743 } else
1744 uart_remove_one_port(&sunzilog_reg, &up->port);
1745 }
1746
1747 uart_unregister_driver(&sunzilog_reg);
1748 }
1749
1750 module_init(sunzilog_init);
1751 module_exit(sunzilog_exit);
1752
1753 MODULE_AUTHOR("David S. Miller");
1754 MODULE_DESCRIPTION("Sun Zilog serial port driver");
1755 MODULE_LICENSE("GPL");
Support for the Chinese Samsung S3C2440 based development boards