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Linux-2.6.12-rc2
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / serial / sunzilog.c
blob5c4231ae295b05cf7750a4ba3bd7533f154532f3
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;
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 if (unlikely(tty->flip.count >= TTY_FLIPBUF_SIZE)) {
366 tty->flip.work.func((void *)tty);
367 /*
368 * The 8250 bails out of the loop here,
369 * but we need to read everything, or die.
370 */
371 if (tty->flip.count >= TTY_FLIPBUF_SIZE)
372 continue;
373 }
374
375 /* A real serial line, record the character and status. */
376 *tty->flip.char_buf_ptr = ch;
377 *tty->flip.flag_buf_ptr = TTY_NORMAL;
378 up->port.icount.rx++;
379 if (r1 & (BRK_ABRT | PAR_ERR | Rx_OVR | CRC_ERR)) {
380 if (r1 & BRK_ABRT) {
381 r1 &= ~(PAR_ERR | CRC_ERR);
382 up->port.icount.brk++;
383 if (uart_handle_break(&up->port))
384 continue;
385 }
386 else if (r1 & PAR_ERR)
387 up->port.icount.parity++;
388 else if (r1 & CRC_ERR)
389 up->port.icount.frame++;
390 if (r1 & Rx_OVR)
391 up->port.icount.overrun++;
392 r1 &= up->port.read_status_mask;
393 if (r1 & BRK_ABRT)
394 *tty->flip.flag_buf_ptr = TTY_BREAK;
395 else if (r1 & PAR_ERR)
396 *tty->flip.flag_buf_ptr = TTY_PARITY;
397 else if (r1 & CRC_ERR)
398 *tty->flip.flag_buf_ptr = TTY_FRAME;
399 }
400 if (uart_handle_sysrq_char(&up->port, ch, regs))
401 continue;
402
403 if (up->port.ignore_status_mask == 0xff ||
404 (r1 & up->port.ignore_status_mask) == 0) {
405 tty->flip.flag_buf_ptr++;
406 tty->flip.char_buf_ptr++;
407 tty->flip.count++;
408 }
409 if ((r1 & Rx_OVR) &&
410 tty->flip.count < TTY_FLIPBUF_SIZE) {
411 *tty->flip.flag_buf_ptr = TTY_OVERRUN;
412 tty->flip.flag_buf_ptr++;
413 tty->flip.char_buf_ptr++;
414 tty->flip.count++;
415 }
416 }
417
418 return tty;
419 }
420
421 static void sunzilog_status_handle(struct uart_sunzilog_port *up,
422 struct zilog_channel __iomem *channel,
423 struct pt_regs *regs)
424 {
425 unsigned char status;
426
427 status = sbus_readb(&channel->control);
428 ZSDELAY();
429
430 sbus_writeb(RES_EXT_INT, &channel->control);
431 ZSDELAY();
432 ZS_WSYNC(channel);
433
434 if (status & BRK_ABRT) {
435 if (ZS_IS_MOUSE(up))
436 sunzilog_kbdms_receive_chars(up, 0, 1, regs);
437 if (ZS_IS_CONS(up)) {
438 /* Wait for BREAK to deassert to avoid potentially
439 * confusing the PROM.
440 */
441 while (1) {
442 status = sbus_readb(&channel->control);
443 ZSDELAY();
444 if (!(status & BRK_ABRT))
445 break;
446 }
447 sun_do_break();
448 return;
449 }
450 }
451
452 if (ZS_WANTS_MODEM_STATUS(up)) {
453 if (status & SYNC)
454 up->port.icount.dsr++;
455
456 /* The Zilog just gives us an interrupt when DCD/CTS/etc. change.
457 * But it does not tell us which bit has changed, we have to keep
458 * track of this ourselves.
459 */
460 if ((status ^ up->prev_status) ^ DCD)
461 uart_handle_dcd_change(&up->port,
462 (status & DCD));
463 if ((status ^ up->prev_status) ^ CTS)
464 uart_handle_cts_change(&up->port,
465 (status & CTS));
466
467 wake_up_interruptible(&up->port.info->delta_msr_wait);
468 }
469
470 up->prev_status = status;
471 }
472
473 static void sunzilog_transmit_chars(struct uart_sunzilog_port *up,
474 struct zilog_channel __iomem *channel)
475 {
476 struct circ_buf *xmit;
477
478 if (ZS_IS_CONS(up)) {
479 unsigned char status = sbus_readb(&channel->control);
480 ZSDELAY();
481
482 /* TX still busy? Just wait for the next TX done interrupt.
483 *
484 * It can occur because of how we do serial console writes. It would
485 * be nice to transmit console writes just like we normally would for
486 * a TTY line. (ie. buffered and TX interrupt driven). That is not
487 * easy because console writes cannot sleep. One solution might be
488 * to poll on enough port->xmit space becomming free. -DaveM
489 */
490 if (!(status & Tx_BUF_EMP))
491 return;
492 }
493
494 up->flags &= ~SUNZILOG_FLAG_TX_ACTIVE;
495
496 if (ZS_REGS_HELD(up)) {
497 __load_zsregs(channel, up->curregs);
498 up->flags &= ~SUNZILOG_FLAG_REGS_HELD;
499 }
500
501 if (ZS_TX_STOPPED(up)) {
502 up->flags &= ~SUNZILOG_FLAG_TX_STOPPED;
503 goto ack_tx_int;
504 }
505
506 if (up->port.x_char) {
507 up->flags |= SUNZILOG_FLAG_TX_ACTIVE;
508 sbus_writeb(up->port.x_char, &channel->data);
509 ZSDELAY();
510 ZS_WSYNC(channel);
511
512 up->port.icount.tx++;
513 up->port.x_char = 0;
514 return;
515 }
516
517 if (up->port.info == NULL)
518 goto ack_tx_int;
519 xmit = &up->port.info->xmit;
520 if (uart_circ_empty(xmit)) {
521 uart_write_wakeup(&up->port);
522 goto ack_tx_int;
523 }
524 if (uart_tx_stopped(&up->port))
525 goto ack_tx_int;
526
527 up->flags |= SUNZILOG_FLAG_TX_ACTIVE;
528 sbus_writeb(xmit->buf[xmit->tail], &channel->data);
529 ZSDELAY();
530 ZS_WSYNC(channel);
531
532 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
533 up->port.icount.tx++;
534
535 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
536 uart_write_wakeup(&up->port);
537
538 return;
539
540 ack_tx_int:
541 sbus_writeb(RES_Tx_P, &channel->control);
542 ZSDELAY();
543 ZS_WSYNC(channel);
544 }
545
546 static irqreturn_t sunzilog_interrupt(int irq, void *dev_id, struct pt_regs *regs)
547 {
548 struct uart_sunzilog_port *up = dev_id;
549
550 while (up) {
551 struct zilog_channel __iomem *channel
552 = ZILOG_CHANNEL_FROM_PORT(&up->port);
553 struct tty_struct *tty;
554 unsigned char r3;
555
556 spin_lock(&up->port.lock);
557 r3 = read_zsreg(channel, R3);
558
559 /* Channel A */
560 tty = NULL;
561 if (r3 & (CHAEXT | CHATxIP | CHARxIP)) {
562 sbus_writeb(RES_H_IUS, &channel->control);
563 ZSDELAY();
564 ZS_WSYNC(channel);
565
566 if (r3 & CHARxIP)
567 tty = sunzilog_receive_chars(up, channel, regs);
568 if (r3 & CHAEXT)
569 sunzilog_status_handle(up, channel, regs);
570 if (r3 & CHATxIP)
571 sunzilog_transmit_chars(up, channel);
572 }
573 spin_unlock(&up->port.lock);
574
575 if (tty)
576 tty_flip_buffer_push(tty);
577
578 /* Channel B */
579 up = up->next;
580 channel = ZILOG_CHANNEL_FROM_PORT(&up->port);
581
582 spin_lock(&up->port.lock);
583 tty = NULL;
584 if (r3 & (CHBEXT | CHBTxIP | CHBRxIP)) {
585 sbus_writeb(RES_H_IUS, &channel->control);
586 ZSDELAY();
587 ZS_WSYNC(channel);
588
589 if (r3 & CHBRxIP)
590 tty = sunzilog_receive_chars(up, channel, regs);
591 if (r3 & CHBEXT)
592 sunzilog_status_handle(up, channel, regs);
593 if (r3 & CHBTxIP)
594 sunzilog_transmit_chars(up, channel);
595 }
596 spin_unlock(&up->port.lock);
597
598 if (tty)
599 tty_flip_buffer_push(tty);
600
601 up = up->next;
602 }
603
604 return IRQ_HANDLED;
605 }
606
607 /* A convenient way to quickly get R0 status. The caller must _not_ hold the
608 * port lock, it is acquired here.
609 */
610 static __inline__ unsigned char sunzilog_read_channel_status(struct uart_port *port)
611 {
612 struct zilog_channel __iomem *channel;
613 unsigned long flags;
614 unsigned char status;
615
616 spin_lock_irqsave(&port->lock, flags);
617
618 channel = ZILOG_CHANNEL_FROM_PORT(port);
619 status = sbus_readb(&channel->control);
620 ZSDELAY();
621
622 spin_unlock_irqrestore(&port->lock, flags);
623
624 return status;
625 }
626
627 /* The port lock is not held. */
628 static unsigned int sunzilog_tx_empty(struct uart_port *port)
629 {
630 unsigned char status;
631 unsigned int ret;
632
633 status = sunzilog_read_channel_status(port);
634 if (status & Tx_BUF_EMP)
635 ret = TIOCSER_TEMT;
636 else
637 ret = 0;
638
639 return ret;
640 }
641
642 /* The port lock is not held. */
643 static unsigned int sunzilog_get_mctrl(struct uart_port *port)
644 {
645 unsigned char status;
646 unsigned int ret;
647
648 status = sunzilog_read_channel_status(port);
649
650 ret = 0;
651 if (status & DCD)
652 ret |= TIOCM_CAR;
653 if (status & SYNC)
654 ret |= TIOCM_DSR;
655 if (status & CTS)
656 ret |= TIOCM_CTS;
657
658 return ret;
659 }
660
661 /* The port lock is held and interrupts are disabled. */
662 static void sunzilog_set_mctrl(struct uart_port *port, unsigned int mctrl)
663 {
664 struct uart_sunzilog_port *up = (struct uart_sunzilog_port *) port;
665 struct zilog_channel __iomem *channel = ZILOG_CHANNEL_FROM_PORT(port);
666 unsigned char set_bits, clear_bits;
667
668 set_bits = clear_bits = 0;
669
670 if (mctrl & TIOCM_RTS)
671 set_bits |= RTS;
672 else
673 clear_bits |= RTS;
674 if (mctrl & TIOCM_DTR)
675 set_bits |= DTR;
676 else
677 clear_bits |= DTR;
678
679 /* NOTE: Not subject to 'transmitter active' rule. */
680 up->curregs[R5] |= set_bits;
681 up->curregs[R5] &= ~clear_bits;
682 write_zsreg(channel, R5, up->curregs[R5]);
683 }
684
685 /* The port lock is held and interrupts are disabled. */
686 static void sunzilog_stop_tx(struct uart_port *port, unsigned int tty_stop)
687 {
688 struct uart_sunzilog_port *up = (struct uart_sunzilog_port *) port;
689
690 up->flags |= SUNZILOG_FLAG_TX_STOPPED;
691 }
692
693 /* The port lock is held and interrupts are disabled. */
694 static void sunzilog_start_tx(struct uart_port *port, unsigned int tty_start)
695 {
696 struct uart_sunzilog_port *up = (struct uart_sunzilog_port *) port;
697 struct zilog_channel __iomem *channel = ZILOG_CHANNEL_FROM_PORT(port);
698 unsigned char status;
699
700 up->flags |= SUNZILOG_FLAG_TX_ACTIVE;
701 up->flags &= ~SUNZILOG_FLAG_TX_STOPPED;
702
703 status = sbus_readb(&channel->control);
704 ZSDELAY();
705
706 /* TX busy? Just wait for the TX done interrupt. */
707 if (!(status & Tx_BUF_EMP))
708 return;
709
710 /* Send the first character to jump-start the TX done
711 * IRQ sending engine.
712 */
713 if (port->x_char) {
714 sbus_writeb(port->x_char, &channel->data);
715 ZSDELAY();
716 ZS_WSYNC(channel);
717
718 port->icount.tx++;
719 port->x_char = 0;
720 } else {
721 struct circ_buf *xmit = &port->info->xmit;
722
723 sbus_writeb(xmit->buf[xmit->tail], &channel->data);
724 ZSDELAY();
725 ZS_WSYNC(channel);
726
727 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
728 port->icount.tx++;
729
730 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
731 uart_write_wakeup(&up->port);
732 }
733 }
734
735 /* The port lock is held. */
736 static void sunzilog_stop_rx(struct uart_port *port)
737 {
738 struct uart_sunzilog_port *up = UART_ZILOG(port);
739 struct zilog_channel __iomem *channel;
740
741 if (ZS_IS_CONS(up))
742 return;
743
744 channel = ZILOG_CHANNEL_FROM_PORT(port);
745
746 /* Disable all RX interrupts. */
747 up->curregs[R1] &= ~RxINT_MASK;
748 sunzilog_maybe_update_regs(up, channel);
749 }
750
751 /* The port lock is held. */
752 static void sunzilog_enable_ms(struct uart_port *port)
753 {
754 struct uart_sunzilog_port *up = (struct uart_sunzilog_port *) port;
755 struct zilog_channel __iomem *channel = ZILOG_CHANNEL_FROM_PORT(port);
756 unsigned char new_reg;
757
758 new_reg = up->curregs[R15] | (DCDIE | SYNCIE | CTSIE);
759 if (new_reg != up->curregs[R15]) {
760 up->curregs[R15] = new_reg;
761
762 /* NOTE: Not subject to 'transmitter active' rule. */
763 write_zsreg(channel, R15, up->curregs[R15]);
764 }
765 }
766
767 /* The port lock is not held. */
768 static void sunzilog_break_ctl(struct uart_port *port, int break_state)
769 {
770 struct uart_sunzilog_port *up = (struct uart_sunzilog_port *) port;
771 struct zilog_channel __iomem *channel = ZILOG_CHANNEL_FROM_PORT(port);
772 unsigned char set_bits, clear_bits, new_reg;
773 unsigned long flags;
774
775 set_bits = clear_bits = 0;
776
777 if (break_state)
778 set_bits |= SND_BRK;
779 else
780 clear_bits |= SND_BRK;
781
782 spin_lock_irqsave(&port->lock, flags);
783
784 new_reg = (up->curregs[R5] | set_bits) & ~clear_bits;
785 if (new_reg != up->curregs[R5]) {
786 up->curregs[R5] = new_reg;
787
788 /* NOTE: Not subject to 'transmitter active' rule. */
789 write_zsreg(channel, R5, up->curregs[R5]);
790 }
791
792 spin_unlock_irqrestore(&port->lock, flags);
793 }
794
795 static void __sunzilog_startup(struct uart_sunzilog_port *up)
796 {
797 struct zilog_channel __iomem *channel;
798
799 channel = ZILOG_CHANNEL_FROM_PORT(&up->port);
800 up->prev_status = sbus_readb(&channel->control);
801
802 /* Enable receiver and transmitter. */
803 up->curregs[R3] |= RxENAB;
804 up->curregs[R5] |= TxENAB;
805
806 up->curregs[R1] |= EXT_INT_ENAB | INT_ALL_Rx | TxINT_ENAB;
807 sunzilog_maybe_update_regs(up, channel);
808 }
809
810 static int sunzilog_startup(struct uart_port *port)
811 {
812 struct uart_sunzilog_port *up = UART_ZILOG(port);
813 unsigned long flags;
814
815 if (ZS_IS_CONS(up))
816 return 0;
817
818 spin_lock_irqsave(&port->lock, flags);
819 __sunzilog_startup(up);
820 spin_unlock_irqrestore(&port->lock, flags);
821 return 0;
822 }
823
824 /*
825 * The test for ZS_IS_CONS is explained by the following e-mail:
826 *****
827 * From: Russell King <rmk@arm.linux.org.uk>
828 * Date: Sun, 8 Dec 2002 10:18:38 +0000
829 *
830 * On Sun, Dec 08, 2002 at 02:43:36AM -0500, Pete Zaitcev wrote:
831 * > I boot my 2.5 boxes using "console=ttyS0,9600" argument,
832 * > and I noticed that something is not right with reference
833 * > counting in this case. It seems that when the console
834 * > is open by kernel initially, this is not accounted
835 * > as an open, and uart_startup is not called.
836 *
837 * That is correct. We are unable to call uart_startup when the serial
838 * console is initialised because it may need to allocate memory (as
839 * request_irq does) and the memory allocators may not have been
840 * initialised.
841 *
842 * 1. initialise the port into a state where it can send characters in the
843 * console write method.
844 *
845 * 2. don't do the actual hardware shutdown in your shutdown() method (but
846 * do the normal software shutdown - ie, free irqs etc)
847 *****
848 */
849 static void sunzilog_shutdown(struct uart_port *port)
850 {
851 struct uart_sunzilog_port *up = UART_ZILOG(port);
852 struct zilog_channel __iomem *channel;
853 unsigned long flags;
854
855 if (ZS_IS_CONS(up))
856 return;
857
858 spin_lock_irqsave(&port->lock, flags);
859
860 channel = ZILOG_CHANNEL_FROM_PORT(port);
861
862 /* Disable receiver and transmitter. */
863 up->curregs[R3] &= ~RxENAB;
864 up->curregs[R5] &= ~TxENAB;
865
866 /* Disable all interrupts and BRK assertion. */
867 up->curregs[R1] &= ~(EXT_INT_ENAB | TxINT_ENAB | RxINT_MASK);
868 up->curregs[R5] &= ~SND_BRK;
869 sunzilog_maybe_update_regs(up, channel);
870
871 spin_unlock_irqrestore(&port->lock, flags);
872 }
873
874 /* Shared by TTY driver and serial console setup. The port lock is held
875 * and local interrupts are disabled.
876 */
877 static void
878 sunzilog_convert_to_zs(struct uart_sunzilog_port *up, unsigned int cflag,
879 unsigned int iflag, int brg)
880 {
881
882 up->curregs[R10] = NRZ;
883 up->curregs[R11] = TCBR | RCBR;
884
885 /* Program BAUD and clock source. */
886 up->curregs[R4] &= ~XCLK_MASK;
887 up->curregs[R4] |= X16CLK;
888 up->curregs[R12] = brg & 0xff;
889 up->curregs[R13] = (brg >> 8) & 0xff;
890 up->curregs[R14] = BRSRC | BRENAB;
891
892 /* Character size, stop bits, and parity. */
893 up->curregs[3] &= ~RxN_MASK;
894 up->curregs[5] &= ~TxN_MASK;
895 switch (cflag & CSIZE) {
896 case CS5:
897 up->curregs[3] |= Rx5;
898 up->curregs[5] |= Tx5;
899 up->parity_mask = 0x1f;
900 break;
901 case CS6:
902 up->curregs[3] |= Rx6;
903 up->curregs[5] |= Tx6;
904 up->parity_mask = 0x3f;
905 break;
906 case CS7:
907 up->curregs[3] |= Rx7;
908 up->curregs[5] |= Tx7;
909 up->parity_mask = 0x7f;
910 break;
911 case CS8:
912 default:
913 up->curregs[3] |= Rx8;
914 up->curregs[5] |= Tx8;
915 up->parity_mask = 0xff;
916 break;
917 };
918 up->curregs[4] &= ~0x0c;
919 if (cflag & CSTOPB)
920 up->curregs[4] |= SB2;
921 else
922 up->curregs[4] |= SB1;
923 if (cflag & PARENB)
924 up->curregs[4] |= PAR_ENAB;
925 else
926 up->curregs[4] &= ~PAR_ENAB;
927 if (!(cflag & PARODD))
928 up->curregs[4] |= PAR_EVEN;
929 else
930 up->curregs[4] &= ~PAR_EVEN;
931
932 up->port.read_status_mask = Rx_OVR;
933 if (iflag & INPCK)
934 up->port.read_status_mask |= CRC_ERR | PAR_ERR;
935 if (iflag & (BRKINT | PARMRK))
936 up->port.read_status_mask |= BRK_ABRT;
937
938 up->port.ignore_status_mask = 0;
939 if (iflag & IGNPAR)
940 up->port.ignore_status_mask |= CRC_ERR | PAR_ERR;
941 if (iflag & IGNBRK) {
942 up->port.ignore_status_mask |= BRK_ABRT;
943 if (iflag & IGNPAR)
944 up->port.ignore_status_mask |= Rx_OVR;
945 }
946
947 if ((cflag & CREAD) == 0)
948 up->port.ignore_status_mask = 0xff;
949 }
950
951 /* The port lock is not held. */
952 static void
953 sunzilog_set_termios(struct uart_port *port, struct termios *termios,
954 struct termios *old)
955 {
956 struct uart_sunzilog_port *up = (struct uart_sunzilog_port *) port;
957 unsigned long flags;
958 int baud, brg;
959
960 baud = uart_get_baud_rate(port, termios, old, 1200, 76800);
961
962 spin_lock_irqsave(&up->port.lock, flags);
963
964 brg = BPS_TO_BRG(baud, ZS_CLOCK / ZS_CLOCK_DIVISOR);
965
966 sunzilog_convert_to_zs(up, termios->c_cflag, termios->c_iflag, brg);
967
968 if (UART_ENABLE_MS(&up->port, termios->c_cflag))
969 up->flags |= SUNZILOG_FLAG_MODEM_STATUS;
970 else
971 up->flags &= ~SUNZILOG_FLAG_MODEM_STATUS;
972
973 up->cflag = termios->c_cflag;
974
975 sunzilog_maybe_update_regs(up, ZILOG_CHANNEL_FROM_PORT(port));
976
977 uart_update_timeout(port, termios->c_cflag, baud);
978
979 spin_unlock_irqrestore(&up->port.lock, flags);
980 }
981
982 static const char *sunzilog_type(struct uart_port *port)
983 {
984 return "SunZilog";
985 }
986
987 /* We do not request/release mappings of the registers here, this
988 * happens at early serial probe time.
989 */
990 static void sunzilog_release_port(struct uart_port *port)
991 {
992 }
993
994 static int sunzilog_request_port(struct uart_port *port)
995 {
996 return 0;
997 }
998
999 /* These do not need to do anything interesting either. */
1000 static void sunzilog_config_port(struct uart_port *port, int flags)
1001 {
1002 }
1003
1004 /* We do not support letting the user mess with the divisor, IRQ, etc. */
1005 static int sunzilog_verify_port(struct uart_port *port, struct serial_struct *ser)
1006 {
1007 return -EINVAL;
1008 }
1009
1010 static struct uart_ops sunzilog_pops = {
1011 .tx_empty = sunzilog_tx_empty,
1012 .set_mctrl = sunzilog_set_mctrl,
1013 .get_mctrl = sunzilog_get_mctrl,
1014 .stop_tx = sunzilog_stop_tx,
1015 .start_tx = sunzilog_start_tx,
1016 .stop_rx = sunzilog_stop_rx,
1017 .enable_ms = sunzilog_enable_ms,
1018 .break_ctl = sunzilog_break_ctl,
1019 .startup = sunzilog_startup,
1020 .shutdown = sunzilog_shutdown,
1021 .set_termios = sunzilog_set_termios,
1022 .type = sunzilog_type,
1023 .release_port = sunzilog_release_port,
1024 .request_port = sunzilog_request_port,
1025 .config_port = sunzilog_config_port,
1026 .verify_port = sunzilog_verify_port,
1027 };
1028
1029 static struct uart_sunzilog_port *sunzilog_port_table;
1030 static struct zilog_layout __iomem **sunzilog_chip_regs;
1031
1032 static struct uart_sunzilog_port *sunzilog_irq_chain;
1033 static int zilog_irq = -1;
1034
1035 static struct uart_driver sunzilog_reg = {
1036 .owner = THIS_MODULE,
1037 .driver_name = "ttyS",
1038 .devfs_name = "tts/",
1039 .dev_name = "ttyS",
1040 .major = TTY_MAJOR,
1041 };
1042
1043 static void * __init alloc_one_table(unsigned long size)
1044 {
1045 void *ret;
1046
1047 ret = kmalloc(size, GFP_KERNEL);
1048 if (ret != NULL)
1049 memset(ret, 0, size);
1050
1051 return ret;
1052 }
1053
1054 static void __init sunzilog_alloc_tables(void)
1055 {
1056 sunzilog_port_table =
1057 alloc_one_table(NUM_CHANNELS * sizeof(struct uart_sunzilog_port));
1058 sunzilog_chip_regs =
1059 alloc_one_table(NUM_SUNZILOG * sizeof(struct zilog_layout __iomem *));
1060
1061 if (sunzilog_port_table == NULL || sunzilog_chip_regs == NULL) {
1062 prom_printf("SunZilog: Cannot allocate tables.\n");
1063 prom_halt();
1064 }
1065 }
1066
1067 #ifdef CONFIG_SPARC64
1068
1069 /* We used to attempt to use the address property of the Zilog device node
1070 * but that totally is not necessary on sparc64.
1071 */
1072 static struct zilog_layout __iomem * __init get_zs_sun4u(int chip, int zsnode)
1073 {
1074 unsigned long mapped_addr;
1075 unsigned int sun4u_ino;
1076 struct sbus_bus *sbus = NULL;
1077 struct sbus_dev *sdev = NULL;
1078 int err;
1079
1080 if (central_bus == NULL) {
1081 for_each_sbus(sbus) {
1082 for_each_sbusdev(sdev, sbus) {
1083 if (sdev->prom_node == zsnode)
1084 goto found;
1085 }
1086 }
1087 }
1088 found:
1089 if (sdev == NULL && central_bus == NULL) {
1090 prom_printf("SunZilog: sdev&&central == NULL for "
1091 "Zilog %d in get_zs_sun4u.\n", chip);
1092 prom_halt();
1093 }
1094 if (central_bus == NULL) {
1095 mapped_addr =
1096 sbus_ioremap(&sdev->resource[0], 0,
1097 PAGE_SIZE,
1098 "Zilog Registers");
1099 } else {
1100 struct linux_prom_registers zsregs[1];
1101
1102 err = prom_getproperty(zsnode, "reg",
1103 (char *) &zsregs[0],
1104 sizeof(zsregs));
1105 if (err == -1) {
1106 prom_printf("SunZilog: Cannot map "
1107 "Zilog %d regs on "
1108 "central bus.\n", chip);
1109 prom_halt();
1110 }
1111 apply_fhc_ranges(central_bus->child,
1112 &zsregs[0], 1);
1113 apply_central_ranges(central_bus, &zsregs[0], 1);
1114 mapped_addr =
1115 (((u64)zsregs[0].which_io)<<32UL) |
1116 ((u64)zsregs[0].phys_addr);
1117 }
1118
1119 if (zilog_irq == -1) {
1120 if (central_bus) {
1121 unsigned long iclr, imap;
1122
1123 iclr = central_bus->child->fhc_regs.uregs
1124 + FHC_UREGS_ICLR;
1125 imap = central_bus->child->fhc_regs.uregs
1126 + FHC_UREGS_IMAP;
1127 zilog_irq = build_irq(12, 0, iclr, imap);
1128 } else {
1129 err = prom_getproperty(zsnode, "interrupts",
1130 (char *) &sun4u_ino,
1131 sizeof(sun4u_ino));
1132 zilog_irq = sbus_build_irq(sbus_root, sun4u_ino);
1133 }
1134 }
1135
1136 return (struct zilog_layout __iomem *) mapped_addr;
1137 }
1138 #else /* CONFIG_SPARC64 */
1139
1140 /*
1141 * XXX The sun4d case is utterly screwed: it tries to re-walk the tree
1142 * (for the 3rd time) in order to find bootbus and cpu. Streamline it.
1143 */
1144 static struct zilog_layout __iomem * __init get_zs_sun4cmd(int chip, int node)
1145 {
1146 struct linux_prom_irqs irq_info[2];
1147 void __iomem *mapped_addr = NULL;
1148 int zsnode, cpunode, bbnode;
1149 struct linux_prom_registers zsreg[4];
1150 struct resource res;
1151
1152 if (sparc_cpu_model == sun4d) {
1153 int walk;
1154
1155 zsnode = 0;
1156 bbnode = 0;
1157 cpunode = 0;
1158 for (walk = prom_getchild(prom_root_node);
1159 (walk = prom_searchsiblings(walk, "cpu-unit")) != 0;
1160 walk = prom_getsibling(walk)) {
1161 bbnode = prom_getchild(walk);
1162 if (bbnode &&
1163 (bbnode = prom_searchsiblings(bbnode, "bootbus"))) {
1164 if ((zsnode = prom_getchild(bbnode)) == node) {
1165 cpunode = walk;
1166 break;
1167 }
1168 }
1169 }
1170 if (!walk) {
1171 prom_printf("SunZilog: Cannot find the %d'th bootbus on sun4d.\n",
1172 (chip / 2));
1173 prom_halt();
1174 }
1175
1176 if (prom_getproperty(zsnode, "reg",
1177 (char *) zsreg, sizeof(zsreg)) == -1) {
1178 prom_printf("SunZilog: Cannot map Zilog %d\n", chip);
1179 prom_halt();
1180 }
1181 /* XXX Looks like an off by one? */
1182 prom_apply_generic_ranges(bbnode, cpunode, zsreg, 1);
1183 res.start = zsreg[0].phys_addr;
1184 res.end = res.start + (8 - 1);
1185 res.flags = zsreg[0].which_io | IORESOURCE_IO;
1186 mapped_addr = sbus_ioremap(&res, 0, 8, "Zilog Serial");
1187
1188 } else {
1189 zsnode = node;
1190
1191 #if 0 /* XXX When was this used? */
1192 if (prom_getintdefault(zsnode, "slave", -1) != chipid) {
1193 zsnode = prom_getsibling(zsnode);
1194 continue;
1195 }
1196 #endif
1197
1198 /*
1199 * "address" is only present on ports that OBP opened
1200 * (from Mitch Bradley's "Hitchhiker's Guide to OBP").
1201 * We do not use it.
1202 */
1203
1204 if (prom_getproperty(zsnode, "reg",
1205 (char *) zsreg, sizeof(zsreg)) == -1) {
1206 prom_printf("SunZilog: Cannot map Zilog %d\n", chip);
1207 prom_halt();
1208 }
1209 if (sparc_cpu_model == sun4m) /* Crude. Pass parent. XXX */
1210 prom_apply_obio_ranges(zsreg, 1);
1211 res.start = zsreg[0].phys_addr;
1212 res.end = res.start + (8 - 1);
1213 res.flags = zsreg[0].which_io | IORESOURCE_IO;
1214 mapped_addr = sbus_ioremap(&res, 0, 8, "Zilog Serial");
1215 }
1216
1217 if (prom_getproperty(zsnode, "intr",
1218 (char *) irq_info, sizeof(irq_info))
1219 % sizeof(struct linux_prom_irqs)) {
1220 prom_printf("SunZilog: Cannot get IRQ property for Zilog %d.\n",
1221 chip);
1222 prom_halt();
1223 }
1224 if (zilog_irq == -1) {
1225 zilog_irq = irq_info[0].pri;
1226 } else if (zilog_irq != irq_info[0].pri) {
1227 /* XXX. Dumb. Should handle per-chip IRQ, for add-ons. */
1228 prom_printf("SunZilog: Inconsistent IRQ layout for Zilog %d.\n",
1229 chip);
1230 prom_halt();
1231 }
1232
1233 return (struct zilog_layout __iomem *) mapped_addr;
1234 }
1235 #endif /* !(CONFIG_SPARC64) */
1236
1237 /* Get the address of the registers for SunZilog instance CHIP. */
1238 static struct zilog_layout __iomem * __init get_zs(int chip, int node)
1239 {
1240 if (chip < 0 || chip >= NUM_SUNZILOG) {
1241 prom_printf("SunZilog: Illegal chip number %d in get_zs.\n", chip);
1242 prom_halt();
1243 }
1244
1245 #ifdef CONFIG_SPARC64
1246 return get_zs_sun4u(chip, node);
1247 #else
1248
1249 if (sparc_cpu_model == sun4) {
1250 struct resource res;
1251
1252 /* Not probe-able, hard code it. */
1253 switch (chip) {
1254 case 0:
1255 res.start = 0xf1000000;
1256 break;
1257 case 1:
1258 res.start = 0xf0000000;
1259 break;
1260 };
1261 zilog_irq = 12;
1262 res.end = (res.start + (8 - 1));
1263 res.flags = IORESOURCE_IO;
1264 return sbus_ioremap(&res, 0, 8, "SunZilog");
1265 }
1266
1267 return get_zs_sun4cmd(chip, node);
1268 #endif
1269 }
1270
1271 #define ZS_PUT_CHAR_MAX_DELAY 2000 /* 10 ms */
1272
1273 static void sunzilog_put_char(struct zilog_channel __iomem *channel, unsigned char ch)
1274 {
1275 int loops = ZS_PUT_CHAR_MAX_DELAY;
1276
1277 /* This is a timed polling loop so do not switch the explicit
1278 * udelay with ZSDELAY as that is a NOP on some platforms. -DaveM
1279 */
1280 do {
1281 unsigned char val = sbus_readb(&channel->control);
1282 if (val & Tx_BUF_EMP) {
1283 ZSDELAY();
1284 break;
1285 }
1286 udelay(5);
1287 } while (--loops);
1288
1289 sbus_writeb(ch, &channel->data);
1290 ZSDELAY();
1291 ZS_WSYNC(channel);
1292 }
1293
1294 #ifdef CONFIG_SERIO
1295
1296 static DEFINE_SPINLOCK(sunzilog_serio_lock);
1297
1298 static int sunzilog_serio_write(struct serio *serio, unsigned char ch)
1299 {
1300 struct uart_sunzilog_port *up = serio->port_data;
1301 unsigned long flags;
1302
1303 spin_lock_irqsave(&sunzilog_serio_lock, flags);
1304
1305 sunzilog_put_char(ZILOG_CHANNEL_FROM_PORT(&up->port), ch);
1306
1307 spin_unlock_irqrestore(&sunzilog_serio_lock, flags);
1308
1309 return 0;
1310 }
1311
1312 static int sunzilog_serio_open(struct serio *serio)
1313 {
1314 struct uart_sunzilog_port *up = serio->port_data;
1315 unsigned long flags;
1316 int ret;
1317
1318 spin_lock_irqsave(&sunzilog_serio_lock, flags);
1319 if (!up->serio_open) {
1320 up->serio_open = 1;
1321 ret = 0;
1322 } else
1323 ret = -EBUSY;
1324 spin_unlock_irqrestore(&sunzilog_serio_lock, flags);
1325
1326 return ret;
1327 }
1328
1329 static void sunzilog_serio_close(struct serio *serio)
1330 {
1331 struct uart_sunzilog_port *up = serio->port_data;
1332 unsigned long flags;
1333
1334 spin_lock_irqsave(&sunzilog_serio_lock, flags);
1335 up->serio_open = 0;
1336 spin_unlock_irqrestore(&sunzilog_serio_lock, flags);
1337 }
1338
1339 #endif /* CONFIG_SERIO */
1340
1341 #ifdef CONFIG_SERIAL_SUNZILOG_CONSOLE
1342 static void
1343 sunzilog_console_write(struct console *con, const char *s, unsigned int count)
1344 {
1345 struct uart_sunzilog_port *up = &sunzilog_port_table[con->index];
1346 struct zilog_channel *channel = ZILOG_CHANNEL_FROM_PORT(&up->port);
1347 unsigned long flags;
1348 int i;
1349
1350 spin_lock_irqsave(&up->port.lock, flags);
1351 for (i = 0; i < count; i++, s++) {
1352 sunzilog_put_char(channel, *s);
1353 if (*s == 10)
1354 sunzilog_put_char(channel, 13);
1355 }
1356 udelay(2);
1357 spin_unlock_irqrestore(&up->port.lock, flags);
1358 }
1359
1360 static int __init sunzilog_console_setup(struct console *con, char *options)
1361 {
1362 struct uart_sunzilog_port *up = &sunzilog_port_table[con->index];
1363 unsigned long flags;
1364 int baud, brg;
1365
1366 printk(KERN_INFO "Console: ttyS%d (SunZilog zs%d)\n",
1367 (sunzilog_reg.minor - 64) + con->index, con->index);
1368
1369 /* Get firmware console settings. */
1370 sunserial_console_termios(con);
1371
1372 /* Firmware console speed is limited to 150-->38400 baud so
1373 * this hackish cflag thing is OK.
1374 */
1375 switch (con->cflag & CBAUD) {
1376 case B150: baud = 150; break;
1377 case B300: baud = 300; break;
1378 case B600: baud = 600; break;
1379 case B1200: baud = 1200; break;
1380 case B2400: baud = 2400; break;
1381 case B4800: baud = 4800; break;
1382 default: case B9600: baud = 9600; break;
1383 case B19200: baud = 19200; break;
1384 case B38400: baud = 38400; break;
1385 };
1386
1387 brg = BPS_TO_BRG(baud, ZS_CLOCK / ZS_CLOCK_DIVISOR);
1388
1389 spin_lock_irqsave(&up->port.lock, flags);
1390
1391 up->curregs[R15] = BRKIE;
1392 sunzilog_convert_to_zs(up, con->cflag, 0, brg);
1393
1394 sunzilog_set_mctrl(&up->port, TIOCM_DTR | TIOCM_RTS);
1395 __sunzilog_startup(up);
1396
1397 spin_unlock_irqrestore(&up->port.lock, flags);
1398
1399 return 0;
1400 }
1401
1402 static struct console sunzilog_console = {
1403 .name = "ttyS",
1404 .write = sunzilog_console_write,
1405 .device = uart_console_device,
1406 .setup = sunzilog_console_setup,
1407 .flags = CON_PRINTBUFFER,
1408 .index = -1,
1409 .data = &sunzilog_reg,
1410 };
1411 #define SUNZILOG_CONSOLE (&sunzilog_console)
1412
1413 static int __init sunzilog_console_init(void)
1414 {
1415 int i;
1416
1417 if (con_is_present())
1418 return 0;
1419
1420 for (i = 0; i < NUM_CHANNELS; i++) {
1421 int this_minor = sunzilog_reg.minor + i;
1422
1423 if ((this_minor - 64) == (serial_console - 1))
1424 break;
1425 }
1426 if (i == NUM_CHANNELS)
1427 return 0;
1428
1429 sunzilog_console.index = i;
1430 sunzilog_port_table[i].flags |= SUNZILOG_FLAG_IS_CONS;
1431 register_console(&sunzilog_console);
1432 return 0;
1433 }
1434 #else
1435 #define SUNZILOG_CONSOLE (NULL)
1436 #define sunzilog_console_init() do { } while (0)
1437 #endif
1438
1439 /*
1440 * We scan the PROM tree recursively. This is the most reliable way
1441 * to find Zilog nodes on various platforms. However, we face an extreme
1442 * shortage of kernel stack, so we must be very careful. To that end,
1443 * we scan only to a certain depth, and we use a common property buffer
1444 * in the scan structure.
1445 */
1446 #define ZS_PROPSIZE 128
1447 #define ZS_SCAN_DEPTH 5
1448
1449 struct zs_probe_scan {
1450 int depth;
1451 void (*scanner)(struct zs_probe_scan *t, int node);
1452
1453 int devices;
1454 char prop[ZS_PROPSIZE];
1455 };
1456
1457 static int __inline__ sunzilog_node_ok(int node, const char *name, int len)
1458 {
1459 if (strncmp(name, "zs", len) == 0)
1460 return 1;
1461 /* Don't fold this procedure just yet. Compare to su_node_ok(). */
1462 return 0;
1463 }
1464
1465 static void __init sunzilog_scan(struct zs_probe_scan *t, int node)
1466 {
1467 int len;
1468
1469 for (; node != 0; node = prom_getsibling(node)) {
1470 len = prom_getproperty(node, "name", t->prop, ZS_PROPSIZE);
1471 if (len <= 1)
1472 continue; /* Broken PROM node */
1473 if (sunzilog_node_ok(node, t->prop, len)) {
1474 (*t->scanner)(t, node);
1475 } else {
1476 if (t->depth < ZS_SCAN_DEPTH) {
1477 t->depth++;
1478 sunzilog_scan(t, prom_getchild(node));
1479 --t->depth;
1480 }
1481 }
1482 }
1483 }
1484
1485 static void __init sunzilog_prepare(void)
1486 {
1487 struct uart_sunzilog_port *up;
1488 struct zilog_layout __iomem *rp;
1489 int channel, chip;
1490
1491 /*
1492 * Temporary fix.
1493 */
1494 for (channel = 0; channel < NUM_CHANNELS; channel++)
1495 spin_lock_init(&sunzilog_port_table[channel].port.lock);
1496
1497 sunzilog_irq_chain = up = &sunzilog_port_table[0];
1498 for (channel = 0; channel < NUM_CHANNELS - 1; channel++)
1499 up[channel].next = &up[channel + 1];
1500 up[channel].next = NULL;
1501
1502 for (chip = 0; chip < NUM_SUNZILOG; chip++) {
1503 rp = sunzilog_chip_regs[chip];
1504 up[(chip * 2) + 0].port.membase = (void __iomem *)&rp->channelA;
1505 up[(chip * 2) + 1].port.membase = (void __iomem *)&rp->channelB;
1506
1507 /* Channel A */
1508 up[(chip * 2) + 0].port.iotype = SERIAL_IO_MEM;
1509 up[(chip * 2) + 0].port.irq = zilog_irq;
1510 up[(chip * 2) + 0].port.uartclk = ZS_CLOCK;
1511 up[(chip * 2) + 0].port.fifosize = 1;
1512 up[(chip * 2) + 0].port.ops = &sunzilog_pops;
1513 up[(chip * 2) + 0].port.type = PORT_SUNZILOG;
1514 up[(chip * 2) + 0].port.flags = 0;
1515 up[(chip * 2) + 0].port.line = (chip * 2) + 0;
1516 up[(chip * 2) + 0].flags |= SUNZILOG_FLAG_IS_CHANNEL_A;
1517
1518 /* Channel B */
1519 up[(chip * 2) + 1].port.iotype = SERIAL_IO_MEM;
1520 up[(chip * 2) + 1].port.irq = zilog_irq;
1521 up[(chip * 2) + 1].port.uartclk = ZS_CLOCK;
1522 up[(chip * 2) + 1].port.fifosize = 1;
1523 up[(chip * 2) + 1].port.ops = &sunzilog_pops;
1524 up[(chip * 2) + 1].port.type = PORT_SUNZILOG;
1525 up[(chip * 2) + 1].port.flags = 0;
1526 up[(chip * 2) + 1].port.line = (chip * 2) + 1;
1527 up[(chip * 2) + 1].flags |= 0;
1528 }
1529 }
1530
1531 static void __init sunzilog_init_kbdms(struct uart_sunzilog_port *up, int channel)
1532 {
1533 int baud, brg;
1534
1535 if (channel == KEYBOARD_LINE) {
1536 up->flags |= SUNZILOG_FLAG_CONS_KEYB;
1537 up->cflag = B1200 | CS8 | CLOCAL | CREAD;
1538 baud = 1200;
1539 } else {
1540 up->flags |= SUNZILOG_FLAG_CONS_MOUSE;
1541 up->cflag = B4800 | CS8 | CLOCAL | CREAD;
1542 baud = 4800;
1543 }
1544 printk(KERN_INFO "zs%d at 0x%p (irq = %s) is a SunZilog\n",
1545 channel, up->port.membase, __irq_itoa(zilog_irq));
1546
1547 up->curregs[R15] = BRKIE;
1548 brg = BPS_TO_BRG(baud, ZS_CLOCK / ZS_CLOCK_DIVISOR);
1549 sunzilog_convert_to_zs(up, up->cflag, 0, brg);
1550 sunzilog_set_mctrl(&up->port, TIOCM_DTR | TIOCM_RTS);
1551 __sunzilog_startup(up);
1552 }
1553
1554 #ifdef CONFIG_SERIO
1555 static void __init sunzilog_register_serio(struct uart_sunzilog_port *up, int channel)
1556 {
1557 struct serio *serio;
1558
1559 up->serio = serio = kmalloc(sizeof(struct serio), GFP_KERNEL);
1560 if (serio) {
1561 memset(serio, 0, sizeof(*serio));
1562
1563 serio->port_data = up;
1564
1565 serio->id.type = SERIO_RS232;
1566 if (channel == KEYBOARD_LINE) {
1567 serio->id.proto = SERIO_SUNKBD;
1568 strlcpy(serio->name, "zskbd", sizeof(serio->name));
1569 } else {
1570 serio->id.proto = SERIO_SUN;
1571 serio->id.extra = 1;
1572 strlcpy(serio->name, "zsms", sizeof(serio->name));
1573 }
1574 strlcpy(serio->phys,
1575 (channel == KEYBOARD_LINE ? "zs/serio0" : "zs/serio1"),
1576 sizeof(serio->phys));
1577
1578 serio->write = sunzilog_serio_write;
1579 serio->open = sunzilog_serio_open;
1580 serio->close = sunzilog_serio_close;
1581
1582 serio_register_port(serio);
1583 } else {
1584 printk(KERN_WARNING "zs%d: not enough memory for serio port\n",
1585 channel);
1586 }
1587 }
1588 #endif
1589
1590 static void __init sunzilog_init_hw(void)
1591 {
1592 int i;
1593
1594 for (i = 0; i < NUM_CHANNELS; i++) {
1595 struct uart_sunzilog_port *up = &sunzilog_port_table[i];
1596 struct zilog_channel __iomem *channel = ZILOG_CHANNEL_FROM_PORT(&up->port);
1597 unsigned long flags;
1598 int baud, brg;
1599
1600 spin_lock_irqsave(&up->port.lock, flags);
1601
1602 if (ZS_IS_CHANNEL_A(up)) {
1603 write_zsreg(channel, R9, FHWRES);
1604 ZSDELAY_LONG();
1605 (void) read_zsreg(channel, R0);
1606 }
1607
1608 if (i == KEYBOARD_LINE || i == MOUSE_LINE) {
1609 sunzilog_init_kbdms(up, i);
1610 up->curregs[R9] |= (NV | MIE);
1611 write_zsreg(channel, R9, up->curregs[R9]);
1612 } else {
1613 /* Normal serial TTY. */
1614 up->parity_mask = 0xff;
1615 up->curregs[R1] = EXT_INT_ENAB | INT_ALL_Rx | TxINT_ENAB;
1616 up->curregs[R4] = PAR_EVEN | X16CLK | SB1;
1617 up->curregs[R3] = RxENAB | Rx8;
1618 up->curregs[R5] = TxENAB | Tx8;
1619 up->curregs[R9] = NV | MIE;
1620 up->curregs[R10] = NRZ;
1621 up->curregs[R11] = TCBR | RCBR;
1622 baud = 9600;
1623 brg = BPS_TO_BRG(baud, ZS_CLOCK / ZS_CLOCK_DIVISOR);
1624 up->curregs[R12] = (brg & 0xff);
1625 up->curregs[R13] = (brg >> 8) & 0xff;
1626 up->curregs[R14] = BRSRC | BRENAB;
1627 __load_zsregs(channel, up->curregs);
1628 write_zsreg(channel, R9, up->curregs[R9]);
1629 }
1630
1631 spin_unlock_irqrestore(&up->port.lock, flags);
1632
1633 #ifdef CONFIG_SERIO
1634 if (i == KEYBOARD_LINE || i == MOUSE_LINE)
1635 sunzilog_register_serio(up, i);
1636 #endif
1637 }
1638 }
1639
1640 static struct zilog_layout __iomem * __init get_zs(int chip, int node);
1641
1642 static void __init sunzilog_scan_probe(struct zs_probe_scan *t, int node)
1643 {
1644 sunzilog_chip_regs[t->devices] = get_zs(t->devices, node);
1645 t->devices++;
1646 }
1647
1648 static int __init sunzilog_ports_init(void)
1649 {
1650 struct zs_probe_scan scan;
1651 int ret;
1652 int uart_count;
1653 int i;
1654
1655 printk(KERN_DEBUG "SunZilog: %d chips.\n", NUM_SUNZILOG);
1656
1657 scan.scanner = sunzilog_scan_probe;
1658 scan.depth = 0;
1659 scan.devices = 0;
1660 sunzilog_scan(&scan, prom_getchild(prom_root_node));
1661
1662 sunzilog_prepare();
1663
1664 if (request_irq(zilog_irq, sunzilog_interrupt, SA_SHIRQ,
1665 "SunZilog", sunzilog_irq_chain)) {
1666 prom_printf("SunZilog: Unable to register zs interrupt handler.\n");
1667 prom_halt();
1668 }
1669
1670 sunzilog_init_hw();
1671
1672 /* We can only init this once we have probed the Zilogs
1673 * in the system. Do not count channels assigned to keyboards
1674 * or mice when we are deciding how many ports to register.
1675 */
1676 uart_count = 0;
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 uart_count++;
1684 }
1685
1686 sunzilog_reg.nr = uart_count;
1687 sunzilog_reg.cons = SUNZILOG_CONSOLE;
1688
1689 sunzilog_reg.minor = sunserial_current_minor;
1690 sunserial_current_minor += uart_count;
1691
1692 ret = uart_register_driver(&sunzilog_reg);
1693 if (ret == 0) {
1694 sunzilog_console_init();
1695 for (i = 0; i < NUM_CHANNELS; i++) {
1696 struct uart_sunzilog_port *up = &sunzilog_port_table[i];
1697
1698 if (ZS_IS_KEYB(up) || ZS_IS_MOUSE(up))
1699 continue;
1700
1701 if (uart_add_one_port(&sunzilog_reg, &up->port)) {
1702 printk(KERN_ERR
1703 "SunZilog: failed to add port zs%d\n", i);
1704 }
1705 }
1706 }
1707
1708 return ret;
1709 }
1710
1711 static void __init sunzilog_scan_count(struct zs_probe_scan *t, int node)
1712 {
1713 t->devices++;
1714 }
1715
1716 static int __init sunzilog_ports_count(void)
1717 {
1718 struct zs_probe_scan scan;
1719
1720 /* Sun4 Zilog setup is hard coded, no probing to do. */
1721 if (sparc_cpu_model == sun4)
1722 return 2;
1723
1724 scan.scanner = sunzilog_scan_count;
1725 scan.depth = 0;
1726 scan.devices = 0;
1727
1728 sunzilog_scan(&scan, prom_getchild(prom_root_node));
1729
1730 return scan.devices;
1731 }
1732
1733 static int __init sunzilog_init(void)
1734 {
1735
1736 NUM_SUNZILOG = sunzilog_ports_count();
1737 if (NUM_SUNZILOG == 0)
1738 return -ENODEV;
1739
1740 sunzilog_alloc_tables();
1741
1742 sunzilog_ports_init();
1743
1744 return 0;
1745 }
1746
1747 static void __exit sunzilog_exit(void)
1748 {
1749 int i;
1750
1751 for (i = 0; i < NUM_CHANNELS; i++) {
1752 struct uart_sunzilog_port *up = &sunzilog_port_table[i];
1753
1754 if (ZS_IS_KEYB(up) || ZS_IS_MOUSE(up)) {
1755 #ifdef CONFIG_SERIO
1756 if (up->serio) {
1757 serio_unregister_port(up->serio);
1758 up->serio = NULL;
1759 }
1760 #endif
1761 } else
1762 uart_remove_one_port(&sunzilog_reg, &up->port);
1763 }
1764
1765 uart_unregister_driver(&sunzilog_reg);
1766 }
1767
1768 module_init(sunzilog_init);
1769 module_exit(sunzilog_exit);
1770
1771 MODULE_AUTHOR("David S. Miller");
1772 MODULE_DESCRIPTION("Sun Zilog serial port driver");
1773 MODULE_LICENSE("GPL");
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree