Loading...
1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * Driver for PowerMac Z85c30 based ESCC cell found in the
4 * "macio" ASICs of various PowerMac models
5 *
6 * Copyright (C) 2003 Ben. Herrenschmidt (benh@kernel.crashing.org)
7 *
8 * Derived from drivers/macintosh/macserial.c by Paul Mackerras
9 * and drivers/serial/sunzilog.c by David S. Miller
10 *
11 * Hrm... actually, I ripped most of sunzilog (Thanks David !) and
12 * adapted special tweaks needed for us. I don't think it's worth
13 * merging back those though. The DMA code still has to get in
14 * and once done, I expect that driver to remain fairly stable in
15 * the long term, unless we change the driver model again...
16 *
17 * 2004-08-06 Harald Welte <laforge@gnumonks.org>
18 * - Enable BREAK interrupt
19 * - Add support for sysreq
20 *
21 * TODO: - Add DMA support
22 * - Defer port shutdown to a few seconds after close
23 * - maybe put something right into uap->clk_divisor
24 */
25
26#undef DEBUG
27#undef USE_CTRL_O_SYSRQ
28
29#include <linux/module.h>
30#include <linux/tty.h>
31
32#include <linux/tty_flip.h>
33#include <linux/major.h>
34#include <linux/string.h>
35#include <linux/fcntl.h>
36#include <linux/mm.h>
37#include <linux/kernel.h>
38#include <linux/delay.h>
39#include <linux/init.h>
40#include <linux/console.h>
41#include <linux/adb.h>
42#include <linux/pmu.h>
43#include <linux/bitops.h>
44#include <linux/sysrq.h>
45#include <linux/mutex.h>
46#include <linux/of_address.h>
47#include <linux/of_irq.h>
48#include <asm/sections.h>
49#include <linux/io.h>
50#include <asm/irq.h>
51
52#ifdef CONFIG_PPC_PMAC
53#include <asm/machdep.h>
54#include <asm/pmac_feature.h>
55#include <asm/macio.h>
56#else
57#include <linux/platform_device.h>
58#define of_machine_is_compatible(x) (0)
59#endif
60
61#include <linux/serial.h>
62#include <linux/serial_core.h>
63
64#include "pmac_zilog.h"
65
66MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>");
67MODULE_DESCRIPTION("Driver for the Mac and PowerMac serial ports.");
68MODULE_LICENSE("GPL");
69
70#ifdef CONFIG_SERIAL_PMACZILOG_TTYS
71#define PMACZILOG_MAJOR TTY_MAJOR
72#define PMACZILOG_MINOR 64
73#define PMACZILOG_NAME "ttyS"
74#else
75#define PMACZILOG_MAJOR 204
76#define PMACZILOG_MINOR 192
77#define PMACZILOG_NAME "ttyPZ"
78#endif
79
80#define pmz_debug(fmt, arg...) pr_debug("ttyPZ%d: " fmt, uap->port.line, ## arg)
81#define pmz_error(fmt, arg...) pr_err("ttyPZ%d: " fmt, uap->port.line, ## arg)
82#define pmz_info(fmt, arg...) pr_info("ttyPZ%d: " fmt, uap->port.line, ## arg)
83
84/*
85 * For the sake of early serial console, we can do a pre-probe
86 * (optional) of the ports at rather early boot time.
87 */
88static struct uart_pmac_port pmz_ports[MAX_ZS_PORTS];
89static int pmz_ports_count;
90
91static struct uart_driver pmz_uart_reg = {
92 .owner = THIS_MODULE,
93 .driver_name = PMACZILOG_NAME,
94 .dev_name = PMACZILOG_NAME,
95 .major = PMACZILOG_MAJOR,
96 .minor = PMACZILOG_MINOR,
97};
98
99
100/*
101 * Load all registers to reprogram the port
102 * This function must only be called when the TX is not busy. The UART
103 * port lock must be held and local interrupts disabled.
104 */
105static void pmz_load_zsregs(struct uart_pmac_port *uap, u8 *regs)
106{
107 int i;
108
109 /* Let pending transmits finish. */
110 for (i = 0; i < 1000; i++) {
111 unsigned char stat = read_zsreg(uap, R1);
112 if (stat & ALL_SNT)
113 break;
114 udelay(100);
115 }
116
117 ZS_CLEARERR(uap);
118 zssync(uap);
119 ZS_CLEARFIFO(uap);
120 zssync(uap);
121 ZS_CLEARERR(uap);
122
123 /* Disable all interrupts. */
124 write_zsreg(uap, R1,
125 regs[R1] & ~(RxINT_MASK | TxINT_ENAB | EXT_INT_ENAB));
126
127 /* Set parity, sync config, stop bits, and clock divisor. */
128 write_zsreg(uap, R4, regs[R4]);
129
130 /* Set misc. TX/RX control bits. */
131 write_zsreg(uap, R10, regs[R10]);
132
133 /* Set TX/RX controls sans the enable bits. */
134 write_zsreg(uap, R3, regs[R3] & ~RxENABLE);
135 write_zsreg(uap, R5, regs[R5] & ~TxENABLE);
136
137 /* now set R7 "prime" on ESCC */
138 write_zsreg(uap, R15, regs[R15] | EN85C30);
139 write_zsreg(uap, R7, regs[R7P]);
140
141 /* make sure we use R7 "non-prime" on ESCC */
142 write_zsreg(uap, R15, regs[R15] & ~EN85C30);
143
144 /* Synchronous mode config. */
145 write_zsreg(uap, R6, regs[R6]);
146 write_zsreg(uap, R7, regs[R7]);
147
148 /* Disable baud generator. */
149 write_zsreg(uap, R14, regs[R14] & ~BRENAB);
150
151 /* Clock mode control. */
152 write_zsreg(uap, R11, regs[R11]);
153
154 /* Lower and upper byte of baud rate generator divisor. */
155 write_zsreg(uap, R12, regs[R12]);
156 write_zsreg(uap, R13, regs[R13]);
157
158 /* Now rewrite R14, with BRENAB (if set). */
159 write_zsreg(uap, R14, regs[R14]);
160
161 /* Reset external status interrupts. */
162 write_zsreg(uap, R0, RES_EXT_INT);
163 write_zsreg(uap, R0, RES_EXT_INT);
164
165 /* Rewrite R3/R5, this time without enables masked. */
166 write_zsreg(uap, R3, regs[R3]);
167 write_zsreg(uap, R5, regs[R5]);
168
169 /* Rewrite R1, this time without IRQ enabled masked. */
170 write_zsreg(uap, R1, regs[R1]);
171
172 /* Enable interrupts */
173 write_zsreg(uap, R9, regs[R9]);
174}
175
176/*
177 * We do like sunzilog to avoid disrupting pending Tx
178 * Reprogram the Zilog channel HW registers with the copies found in the
179 * software state struct. If the transmitter is busy, we defer this update
180 * until the next TX complete interrupt. Else, we do it right now.
181 *
182 * The UART port lock must be held and local interrupts disabled.
183 */
184static void pmz_maybe_update_regs(struct uart_pmac_port *uap)
185{
186 if (!ZS_REGS_HELD(uap)) {
187 if (ZS_TX_ACTIVE(uap)) {
188 uap->flags |= PMACZILOG_FLAG_REGS_HELD;
189 } else {
190 pmz_debug("pmz: maybe_update_regs: updating\n");
191 pmz_load_zsregs(uap, uap->curregs);
192 }
193 }
194}
195
196static void pmz_interrupt_control(struct uart_pmac_port *uap, int enable)
197{
198 if (enable) {
199 uap->curregs[1] |= INT_ALL_Rx | TxINT_ENAB;
200 if (!ZS_IS_EXTCLK(uap))
201 uap->curregs[1] |= EXT_INT_ENAB;
202 } else {
203 uap->curregs[1] &= ~(EXT_INT_ENAB | TxINT_ENAB | RxINT_MASK);
204 }
205 write_zsreg(uap, R1, uap->curregs[1]);
206}
207
208static bool pmz_receive_chars(struct uart_pmac_port *uap)
209 __must_hold(&uap->port.lock)
210{
211 struct tty_port *port;
212 unsigned char ch, r1, drop, flag;
213 int loops = 0;
214
215 /* Sanity check, make sure the old bug is no longer happening */
216 if (uap->port.state == NULL) {
217 WARN_ON(1);
218 (void)read_zsdata(uap);
219 return false;
220 }
221 port = &uap->port.state->port;
222
223 while (1) {
224 drop = 0;
225
226 r1 = read_zsreg(uap, R1);
227 ch = read_zsdata(uap);
228
229 if (r1 & (PAR_ERR | Rx_OVR | CRC_ERR)) {
230 write_zsreg(uap, R0, ERR_RES);
231 zssync(uap);
232 }
233
234 ch &= uap->parity_mask;
235 if (ch == 0 && uap->flags & PMACZILOG_FLAG_BREAK) {
236 uap->flags &= ~PMACZILOG_FLAG_BREAK;
237 }
238
239#if defined(CONFIG_MAGIC_SYSRQ) && defined(CONFIG_SERIAL_CORE_CONSOLE)
240#ifdef USE_CTRL_O_SYSRQ
241 /* Handle the SysRq ^O Hack */
242 if (ch == '\x0f') {
243 uap->port.sysrq = jiffies + HZ*5;
244 goto next_char;
245 }
246#endif /* USE_CTRL_O_SYSRQ */
247 if (uap->port.sysrq) {
248 int swallow;
249 uart_port_unlock(&uap->port);
250 swallow = uart_handle_sysrq_char(&uap->port, ch);
251 uart_port_lock(&uap->port);
252 if (swallow)
253 goto next_char;
254 }
255#endif /* CONFIG_MAGIC_SYSRQ && CONFIG_SERIAL_CORE_CONSOLE */
256
257 /* A real serial line, record the character and status. */
258 if (drop)
259 goto next_char;
260
261 flag = TTY_NORMAL;
262 uap->port.icount.rx++;
263
264 if (r1 & (PAR_ERR | Rx_OVR | CRC_ERR | BRK_ABRT)) {
265 if (r1 & BRK_ABRT) {
266 pmz_debug("pmz: got break !\n");
267 r1 &= ~(PAR_ERR | CRC_ERR);
268 uap->port.icount.brk++;
269 if (uart_handle_break(&uap->port))
270 goto next_char;
271 }
272 else if (r1 & PAR_ERR)
273 uap->port.icount.parity++;
274 else if (r1 & CRC_ERR)
275 uap->port.icount.frame++;
276 if (r1 & Rx_OVR)
277 uap->port.icount.overrun++;
278 r1 &= uap->port.read_status_mask;
279 if (r1 & BRK_ABRT)
280 flag = TTY_BREAK;
281 else if (r1 & PAR_ERR)
282 flag = TTY_PARITY;
283 else if (r1 & CRC_ERR)
284 flag = TTY_FRAME;
285 }
286
287 if (uap->port.ignore_status_mask == 0xff ||
288 (r1 & uap->port.ignore_status_mask) == 0) {
289 tty_insert_flip_char(port, ch, flag);
290 }
291 if (r1 & Rx_OVR)
292 tty_insert_flip_char(port, 0, TTY_OVERRUN);
293 next_char:
294 /* We can get stuck in an infinite loop getting char 0 when the
295 * line is in a wrong HW state, we break that here.
296 * When that happens, I disable the receive side of the driver.
297 * Note that what I've been experiencing is a real irq loop where
298 * I'm getting flooded regardless of the actual port speed.
299 * Something strange is going on with the HW
300 */
301 if ((++loops) > 1000)
302 goto flood;
303 ch = read_zsreg(uap, R0);
304 if (!(ch & Rx_CH_AV))
305 break;
306 }
307
308 return true;
309 flood:
310 pmz_interrupt_control(uap, 0);
311 pmz_error("pmz: rx irq flood !\n");
312 return true;
313}
314
315static void pmz_status_handle(struct uart_pmac_port *uap)
316{
317 unsigned char status;
318
319 status = read_zsreg(uap, R0);
320 write_zsreg(uap, R0, RES_EXT_INT);
321 zssync(uap);
322
323 if (ZS_IS_OPEN(uap) && ZS_WANTS_MODEM_STATUS(uap)) {
324 if (status & SYNC_HUNT)
325 uap->port.icount.dsr++;
326
327 /* The Zilog just gives us an interrupt when DCD/CTS/etc. change.
328 * But it does not tell us which bit has changed, we have to keep
329 * track of this ourselves.
330 * The CTS input is inverted for some reason. -- paulus
331 */
332 if ((status ^ uap->prev_status) & DCD)
333 uart_handle_dcd_change(&uap->port,
334 (status & DCD));
335 if ((status ^ uap->prev_status) & CTS)
336 uart_handle_cts_change(&uap->port,
337 !(status & CTS));
338
339 wake_up_interruptible(&uap->port.state->port.delta_msr_wait);
340 }
341
342 if (status & BRK_ABRT)
343 uap->flags |= PMACZILOG_FLAG_BREAK;
344
345 uap->prev_status = status;
346}
347
348static void pmz_transmit_chars(struct uart_pmac_port *uap)
349{
350 struct circ_buf *xmit;
351
352 if (ZS_IS_CONS(uap)) {
353 unsigned char status = read_zsreg(uap, R0);
354
355 /* TX still busy? Just wait for the next TX done interrupt.
356 *
357 * It can occur because of how we do serial console writes. It would
358 * be nice to transmit console writes just like we normally would for
359 * a TTY line. (ie. buffered and TX interrupt driven). That is not
360 * easy because console writes cannot sleep. One solution might be
361 * to poll on enough port->xmit space becoming free. -DaveM
362 */
363 if (!(status & Tx_BUF_EMP))
364 return;
365 }
366
367 uap->flags &= ~PMACZILOG_FLAG_TX_ACTIVE;
368
369 if (ZS_REGS_HELD(uap)) {
370 pmz_load_zsregs(uap, uap->curregs);
371 uap->flags &= ~PMACZILOG_FLAG_REGS_HELD;
372 }
373
374 if (ZS_TX_STOPPED(uap)) {
375 uap->flags &= ~PMACZILOG_FLAG_TX_STOPPED;
376 goto ack_tx_int;
377 }
378
379 /* Under some circumstances, we see interrupts reported for
380 * a closed channel. The interrupt mask in R1 is clear, but
381 * R3 still signals the interrupts and we see them when taking
382 * an interrupt for the other channel (this could be a qemu
383 * bug but since the ESCC doc doesn't specify precsiely whether
384 * R3 interrup status bits are masked by R1 interrupt enable
385 * bits, better safe than sorry). --BenH.
386 */
387 if (!ZS_IS_OPEN(uap))
388 goto ack_tx_int;
389
390 if (uap->port.x_char) {
391 uap->flags |= PMACZILOG_FLAG_TX_ACTIVE;
392 write_zsdata(uap, uap->port.x_char);
393 zssync(uap);
394 uap->port.icount.tx++;
395 uap->port.x_char = 0;
396 return;
397 }
398
399 if (uap->port.state == NULL)
400 goto ack_tx_int;
401 xmit = &uap->port.state->xmit;
402 if (uart_circ_empty(xmit)) {
403 uart_write_wakeup(&uap->port);
404 goto ack_tx_int;
405 }
406 if (uart_tx_stopped(&uap->port))
407 goto ack_tx_int;
408
409 uap->flags |= PMACZILOG_FLAG_TX_ACTIVE;
410 write_zsdata(uap, xmit->buf[xmit->tail]);
411 zssync(uap);
412
413 uart_xmit_advance(&uap->port, 1);
414
415 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
416 uart_write_wakeup(&uap->port);
417
418 return;
419
420ack_tx_int:
421 write_zsreg(uap, R0, RES_Tx_P);
422 zssync(uap);
423}
424
425/* Hrm... we register that twice, fixme later.... */
426static irqreturn_t pmz_interrupt(int irq, void *dev_id)
427{
428 struct uart_pmac_port *uap = dev_id;
429 struct uart_pmac_port *uap_a;
430 struct uart_pmac_port *uap_b;
431 int rc = IRQ_NONE;
432 bool push;
433 u8 r3;
434
435 uap_a = pmz_get_port_A(uap);
436 uap_b = uap_a->mate;
437
438 uart_port_lock(&uap_a->port);
439 r3 = read_zsreg(uap_a, R3);
440
441 /* Channel A */
442 push = false;
443 if (r3 & (CHAEXT | CHATxIP | CHARxIP)) {
444 if (!ZS_IS_OPEN(uap_a)) {
445 pmz_debug("ChanA interrupt while not open !\n");
446 goto skip_a;
447 }
448 write_zsreg(uap_a, R0, RES_H_IUS);
449 zssync(uap_a);
450 if (r3 & CHAEXT)
451 pmz_status_handle(uap_a);
452 if (r3 & CHARxIP)
453 push = pmz_receive_chars(uap_a);
454 if (r3 & CHATxIP)
455 pmz_transmit_chars(uap_a);
456 rc = IRQ_HANDLED;
457 }
458 skip_a:
459 uart_port_unlock(&uap_a->port);
460 if (push)
461 tty_flip_buffer_push(&uap->port.state->port);
462
463 if (!uap_b)
464 goto out;
465
466 uart_port_lock(&uap_b->port);
467 push = false;
468 if (r3 & (CHBEXT | CHBTxIP | CHBRxIP)) {
469 if (!ZS_IS_OPEN(uap_b)) {
470 pmz_debug("ChanB interrupt while not open !\n");
471 goto skip_b;
472 }
473 write_zsreg(uap_b, R0, RES_H_IUS);
474 zssync(uap_b);
475 if (r3 & CHBEXT)
476 pmz_status_handle(uap_b);
477 if (r3 & CHBRxIP)
478 push = pmz_receive_chars(uap_b);
479 if (r3 & CHBTxIP)
480 pmz_transmit_chars(uap_b);
481 rc = IRQ_HANDLED;
482 }
483 skip_b:
484 uart_port_unlock(&uap_b->port);
485 if (push)
486 tty_flip_buffer_push(&uap->port.state->port);
487
488 out:
489 return rc;
490}
491
492/*
493 * Peek the status register, lock not held by caller
494 */
495static inline u8 pmz_peek_status(struct uart_pmac_port *uap)
496{
497 unsigned long flags;
498 u8 status;
499
500 uart_port_lock_irqsave(&uap->port, &flags);
501 status = read_zsreg(uap, R0);
502 uart_port_unlock_irqrestore(&uap->port, flags);
503
504 return status;
505}
506
507/*
508 * Check if transmitter is empty
509 * The port lock is not held.
510 */
511static unsigned int pmz_tx_empty(struct uart_port *port)
512{
513 unsigned char status;
514
515 status = pmz_peek_status(to_pmz(port));
516 if (status & Tx_BUF_EMP)
517 return TIOCSER_TEMT;
518 return 0;
519}
520
521/*
522 * Set Modem Control (RTS & DTR) bits
523 * The port lock is held and interrupts are disabled.
524 * Note: Shall we really filter out RTS on external ports or
525 * should that be dealt at higher level only ?
526 */
527static void pmz_set_mctrl(struct uart_port *port, unsigned int mctrl)
528{
529 struct uart_pmac_port *uap = to_pmz(port);
530 unsigned char set_bits, clear_bits;
531
532 /* Do nothing for irda for now... */
533 if (ZS_IS_IRDA(uap))
534 return;
535 /* We get called during boot with a port not up yet */
536 if (!(ZS_IS_OPEN(uap) || ZS_IS_CONS(uap)))
537 return;
538
539 set_bits = clear_bits = 0;
540
541 if (ZS_IS_INTMODEM(uap)) {
542 if (mctrl & TIOCM_RTS)
543 set_bits |= RTS;
544 else
545 clear_bits |= RTS;
546 }
547 if (mctrl & TIOCM_DTR)
548 set_bits |= DTR;
549 else
550 clear_bits |= DTR;
551
552 /* NOTE: Not subject to 'transmitter active' rule. */
553 uap->curregs[R5] |= set_bits;
554 uap->curregs[R5] &= ~clear_bits;
555
556 write_zsreg(uap, R5, uap->curregs[R5]);
557 pmz_debug("pmz_set_mctrl: set bits: %x, clear bits: %x -> %x\n",
558 set_bits, clear_bits, uap->curregs[R5]);
559 zssync(uap);
560}
561
562/*
563 * Get Modem Control bits (only the input ones, the core will
564 * or that with a cached value of the control ones)
565 * The port lock is held and interrupts are disabled.
566 */
567static unsigned int pmz_get_mctrl(struct uart_port *port)
568{
569 struct uart_pmac_port *uap = to_pmz(port);
570 unsigned char status;
571 unsigned int ret;
572
573 status = read_zsreg(uap, R0);
574
575 ret = 0;
576 if (status & DCD)
577 ret |= TIOCM_CAR;
578 if (status & SYNC_HUNT)
579 ret |= TIOCM_DSR;
580 if (!(status & CTS))
581 ret |= TIOCM_CTS;
582
583 return ret;
584}
585
586/*
587 * Stop TX side. Dealt like sunzilog at next Tx interrupt,
588 * though for DMA, we will have to do a bit more.
589 * The port lock is held and interrupts are disabled.
590 */
591static void pmz_stop_tx(struct uart_port *port)
592{
593 to_pmz(port)->flags |= PMACZILOG_FLAG_TX_STOPPED;
594}
595
596/*
597 * Kick the Tx side.
598 * The port lock is held and interrupts are disabled.
599 */
600static void pmz_start_tx(struct uart_port *port)
601{
602 struct uart_pmac_port *uap = to_pmz(port);
603 unsigned char status;
604
605 uap->flags |= PMACZILOG_FLAG_TX_ACTIVE;
606 uap->flags &= ~PMACZILOG_FLAG_TX_STOPPED;
607
608 status = read_zsreg(uap, R0);
609
610 /* TX busy? Just wait for the TX done interrupt. */
611 if (!(status & Tx_BUF_EMP))
612 return;
613
614 /* Send the first character to jump-start the TX done
615 * IRQ sending engine.
616 */
617 if (port->x_char) {
618 write_zsdata(uap, port->x_char);
619 zssync(uap);
620 port->icount.tx++;
621 port->x_char = 0;
622 } else {
623 struct circ_buf *xmit = &port->state->xmit;
624
625 if (uart_circ_empty(xmit))
626 return;
627 write_zsdata(uap, xmit->buf[xmit->tail]);
628 zssync(uap);
629 uart_xmit_advance(port, 1);
630
631 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
632 uart_write_wakeup(&uap->port);
633 }
634}
635
636/*
637 * Stop Rx side, basically disable emitting of
638 * Rx interrupts on the port. We don't disable the rx
639 * side of the chip proper though
640 * The port lock is held.
641 */
642static void pmz_stop_rx(struct uart_port *port)
643{
644 struct uart_pmac_port *uap = to_pmz(port);
645
646 /* Disable all RX interrupts. */
647 uap->curregs[R1] &= ~RxINT_MASK;
648 pmz_maybe_update_regs(uap);
649}
650
651/*
652 * Enable modem status change interrupts
653 * The port lock is held.
654 */
655static void pmz_enable_ms(struct uart_port *port)
656{
657 struct uart_pmac_port *uap = to_pmz(port);
658 unsigned char new_reg;
659
660 if (ZS_IS_IRDA(uap))
661 return;
662 new_reg = uap->curregs[R15] | (DCDIE | SYNCIE | CTSIE);
663 if (new_reg != uap->curregs[R15]) {
664 uap->curregs[R15] = new_reg;
665
666 /* NOTE: Not subject to 'transmitter active' rule. */
667 write_zsreg(uap, R15, uap->curregs[R15]);
668 }
669}
670
671/*
672 * Control break state emission
673 * The port lock is not held.
674 */
675static void pmz_break_ctl(struct uart_port *port, int break_state)
676{
677 struct uart_pmac_port *uap = to_pmz(port);
678 unsigned char set_bits, clear_bits, new_reg;
679 unsigned long flags;
680
681 set_bits = clear_bits = 0;
682
683 if (break_state)
684 set_bits |= SND_BRK;
685 else
686 clear_bits |= SND_BRK;
687
688 uart_port_lock_irqsave(port, &flags);
689
690 new_reg = (uap->curregs[R5] | set_bits) & ~clear_bits;
691 if (new_reg != uap->curregs[R5]) {
692 uap->curregs[R5] = new_reg;
693 write_zsreg(uap, R5, uap->curregs[R5]);
694 }
695
696 uart_port_unlock_irqrestore(port, flags);
697}
698
699#ifdef CONFIG_PPC_PMAC
700
701/*
702 * Turn power on or off to the SCC and associated stuff
703 * (port drivers, modem, IR port, etc.)
704 * Returns the number of milliseconds we should wait before
705 * trying to use the port.
706 */
707static int pmz_set_scc_power(struct uart_pmac_port *uap, int state)
708{
709 int delay = 0;
710 int rc;
711
712 if (state) {
713 rc = pmac_call_feature(
714 PMAC_FTR_SCC_ENABLE, uap->node, uap->port_type, 1);
715 pmz_debug("port power on result: %d\n", rc);
716 if (ZS_IS_INTMODEM(uap)) {
717 rc = pmac_call_feature(
718 PMAC_FTR_MODEM_ENABLE, uap->node, 0, 1);
719 delay = 2500; /* wait for 2.5s before using */
720 pmz_debug("modem power result: %d\n", rc);
721 }
722 } else {
723 /* TODO: Make that depend on a timer, don't power down
724 * immediately
725 */
726 if (ZS_IS_INTMODEM(uap)) {
727 rc = pmac_call_feature(
728 PMAC_FTR_MODEM_ENABLE, uap->node, 0, 0);
729 pmz_debug("port power off result: %d\n", rc);
730 }
731 pmac_call_feature(PMAC_FTR_SCC_ENABLE, uap->node, uap->port_type, 0);
732 }
733 return delay;
734}
735
736#else
737
738static int pmz_set_scc_power(struct uart_pmac_port *uap, int state)
739{
740 return 0;
741}
742
743#endif /* !CONFIG_PPC_PMAC */
744
745/*
746 * FixZeroBug....Works around a bug in the SCC receiving channel.
747 * Inspired from Darwin code, 15 Sept. 2000 -DanM
748 *
749 * The following sequence prevents a problem that is seen with O'Hare ASICs
750 * (most versions -- also with some Heathrow and Hydra ASICs) where a zero
751 * at the input to the receiver becomes 'stuck' and locks up the receiver.
752 * This problem can occur as a result of a zero bit at the receiver input
753 * coincident with any of the following events:
754 *
755 * The SCC is initialized (hardware or software).
756 * A framing error is detected.
757 * The clocking option changes from synchronous or X1 asynchronous
758 * clocking to X16, X32, or X64 asynchronous clocking.
759 * The decoding mode is changed among NRZ, NRZI, FM0, or FM1.
760 *
761 * This workaround attempts to recover from the lockup condition by placing
762 * the SCC in synchronous loopback mode with a fast clock before programming
763 * any of the asynchronous modes.
764 */
765static void pmz_fix_zero_bug_scc(struct uart_pmac_port *uap)
766{
767 write_zsreg(uap, 9, ZS_IS_CHANNEL_A(uap) ? CHRA : CHRB);
768 zssync(uap);
769 udelay(10);
770 write_zsreg(uap, 9, (ZS_IS_CHANNEL_A(uap) ? CHRA : CHRB) | NV);
771 zssync(uap);
772
773 write_zsreg(uap, 4, X1CLK | MONSYNC);
774 write_zsreg(uap, 3, Rx8);
775 write_zsreg(uap, 5, Tx8 | RTS);
776 write_zsreg(uap, 9, NV); /* Didn't we already do this? */
777 write_zsreg(uap, 11, RCBR | TCBR);
778 write_zsreg(uap, 12, 0);
779 write_zsreg(uap, 13, 0);
780 write_zsreg(uap, 14, (LOOPBAK | BRSRC));
781 write_zsreg(uap, 14, (LOOPBAK | BRSRC | BRENAB));
782 write_zsreg(uap, 3, Rx8 | RxENABLE);
783 write_zsreg(uap, 0, RES_EXT_INT);
784 write_zsreg(uap, 0, RES_EXT_INT);
785 write_zsreg(uap, 0, RES_EXT_INT); /* to kill some time */
786
787 /* The channel should be OK now, but it is probably receiving
788 * loopback garbage.
789 * Switch to asynchronous mode, disable the receiver,
790 * and discard everything in the receive buffer.
791 */
792 write_zsreg(uap, 9, NV);
793 write_zsreg(uap, 4, X16CLK | SB_MASK);
794 write_zsreg(uap, 3, Rx8);
795
796 while (read_zsreg(uap, 0) & Rx_CH_AV) {
797 (void)read_zsreg(uap, 8);
798 write_zsreg(uap, 0, RES_EXT_INT);
799 write_zsreg(uap, 0, ERR_RES);
800 }
801}
802
803/*
804 * Real startup routine, powers up the hardware and sets up
805 * the SCC. Returns a delay in ms where you need to wait before
806 * actually using the port, this is typically the internal modem
807 * powerup delay. This routine expect the lock to be taken.
808 */
809static int __pmz_startup(struct uart_pmac_port *uap)
810{
811 int pwr_delay = 0;
812
813 memset(&uap->curregs, 0, sizeof(uap->curregs));
814
815 /* Power up the SCC & underlying hardware (modem/irda) */
816 pwr_delay = pmz_set_scc_power(uap, 1);
817
818 /* Nice buggy HW ... */
819 pmz_fix_zero_bug_scc(uap);
820
821 /* Reset the channel */
822 uap->curregs[R9] = 0;
823 write_zsreg(uap, 9, ZS_IS_CHANNEL_A(uap) ? CHRA : CHRB);
824 zssync(uap);
825 udelay(10);
826 write_zsreg(uap, 9, 0);
827 zssync(uap);
828
829 /* Clear the interrupt registers */
830 write_zsreg(uap, R1, 0);
831 write_zsreg(uap, R0, ERR_RES);
832 write_zsreg(uap, R0, ERR_RES);
833 write_zsreg(uap, R0, RES_H_IUS);
834 write_zsreg(uap, R0, RES_H_IUS);
835
836 /* Setup some valid baud rate */
837 uap->curregs[R4] = X16CLK | SB1;
838 uap->curregs[R3] = Rx8;
839 uap->curregs[R5] = Tx8 | RTS;
840 if (!ZS_IS_IRDA(uap))
841 uap->curregs[R5] |= DTR;
842 uap->curregs[R12] = 0;
843 uap->curregs[R13] = 0;
844 uap->curregs[R14] = BRENAB;
845
846 /* Clear handshaking, enable BREAK interrupts */
847 uap->curregs[R15] = BRKIE;
848
849 /* Master interrupt enable */
850 uap->curregs[R9] |= NV | MIE;
851
852 pmz_load_zsregs(uap, uap->curregs);
853
854 /* Enable receiver and transmitter. */
855 write_zsreg(uap, R3, uap->curregs[R3] |= RxENABLE);
856 write_zsreg(uap, R5, uap->curregs[R5] |= TxENABLE);
857
858 /* Remember status for DCD/CTS changes */
859 uap->prev_status = read_zsreg(uap, R0);
860
861 return pwr_delay;
862}
863
864static void pmz_irda_reset(struct uart_pmac_port *uap)
865{
866 unsigned long flags;
867
868 uart_port_lock_irqsave(&uap->port, &flags);
869 uap->curregs[R5] |= DTR;
870 write_zsreg(uap, R5, uap->curregs[R5]);
871 zssync(uap);
872 uart_port_unlock_irqrestore(&uap->port, flags);
873 msleep(110);
874
875 uart_port_lock_irqsave(&uap->port, &flags);
876 uap->curregs[R5] &= ~DTR;
877 write_zsreg(uap, R5, uap->curregs[R5]);
878 zssync(uap);
879 uart_port_unlock_irqrestore(&uap->port, flags);
880 msleep(10);
881}
882
883/*
884 * This is the "normal" startup routine, using the above one
885 * wrapped with the lock and doing a schedule delay
886 */
887static int pmz_startup(struct uart_port *port)
888{
889 struct uart_pmac_port *uap = to_pmz(port);
890 unsigned long flags;
891 int pwr_delay = 0;
892
893 uap->flags |= PMACZILOG_FLAG_IS_OPEN;
894
895 /* A console is never powered down. Else, power up and
896 * initialize the chip
897 */
898 if (!ZS_IS_CONS(uap)) {
899 uart_port_lock_irqsave(port, &flags);
900 pwr_delay = __pmz_startup(uap);
901 uart_port_unlock_irqrestore(port, flags);
902 }
903 sprintf(uap->irq_name, PMACZILOG_NAME"%d", uap->port.line);
904 if (request_irq(uap->port.irq, pmz_interrupt, IRQF_SHARED,
905 uap->irq_name, uap)) {
906 pmz_error("Unable to register zs interrupt handler.\n");
907 pmz_set_scc_power(uap, 0);
908 return -ENXIO;
909 }
910
911 /* Right now, we deal with delay by blocking here, I'll be
912 * smarter later on
913 */
914 if (pwr_delay != 0) {
915 pmz_debug("pmz: delaying %d ms\n", pwr_delay);
916 msleep(pwr_delay);
917 }
918
919 /* IrDA reset is done now */
920 if (ZS_IS_IRDA(uap))
921 pmz_irda_reset(uap);
922
923 /* Enable interrupt requests for the channel */
924 uart_port_lock_irqsave(port, &flags);
925 pmz_interrupt_control(uap, 1);
926 uart_port_unlock_irqrestore(port, flags);
927
928 return 0;
929}
930
931static void pmz_shutdown(struct uart_port *port)
932{
933 struct uart_pmac_port *uap = to_pmz(port);
934 unsigned long flags;
935
936 uart_port_lock_irqsave(port, &flags);
937
938 /* Disable interrupt requests for the channel */
939 pmz_interrupt_control(uap, 0);
940
941 if (!ZS_IS_CONS(uap)) {
942 /* Disable receiver and transmitter */
943 uap->curregs[R3] &= ~RxENABLE;
944 uap->curregs[R5] &= ~TxENABLE;
945
946 /* Disable break assertion */
947 uap->curregs[R5] &= ~SND_BRK;
948 pmz_maybe_update_regs(uap);
949 }
950
951 uart_port_unlock_irqrestore(port, flags);
952
953 /* Release interrupt handler */
954 free_irq(uap->port.irq, uap);
955
956 uart_port_lock_irqsave(port, &flags);
957
958 uap->flags &= ~PMACZILOG_FLAG_IS_OPEN;
959
960 if (!ZS_IS_CONS(uap))
961 pmz_set_scc_power(uap, 0); /* Shut the chip down */
962
963 uart_port_unlock_irqrestore(port, flags);
964}
965
966/* Shared by TTY driver and serial console setup. The port lock is held
967 * and local interrupts are disabled.
968 */
969static void pmz_convert_to_zs(struct uart_pmac_port *uap, unsigned int cflag,
970 unsigned int iflag, unsigned long baud)
971{
972 int brg;
973
974 /* Switch to external clocking for IrDA high clock rates. That
975 * code could be re-used for Midi interfaces with different
976 * multipliers
977 */
978 if (baud >= 115200 && ZS_IS_IRDA(uap)) {
979 uap->curregs[R4] = X1CLK;
980 uap->curregs[R11] = RCTRxCP | TCTRxCP;
981 uap->curregs[R14] = 0; /* BRG off */
982 uap->curregs[R12] = 0;
983 uap->curregs[R13] = 0;
984 uap->flags |= PMACZILOG_FLAG_IS_EXTCLK;
985 } else {
986 switch (baud) {
987 case ZS_CLOCK/16: /* 230400 */
988 uap->curregs[R4] = X16CLK;
989 uap->curregs[R11] = 0;
990 uap->curregs[R14] = 0;
991 break;
992 case ZS_CLOCK/32: /* 115200 */
993 uap->curregs[R4] = X32CLK;
994 uap->curregs[R11] = 0;
995 uap->curregs[R14] = 0;
996 break;
997 default:
998 uap->curregs[R4] = X16CLK;
999 uap->curregs[R11] = TCBR | RCBR;
1000 brg = BPS_TO_BRG(baud, ZS_CLOCK / 16);
1001 uap->curregs[R12] = (brg & 255);
1002 uap->curregs[R13] = ((brg >> 8) & 255);
1003 uap->curregs[R14] = BRENAB;
1004 }
1005 uap->flags &= ~PMACZILOG_FLAG_IS_EXTCLK;
1006 }
1007
1008 /* Character size, stop bits, and parity. */
1009 uap->curregs[3] &= ~RxN_MASK;
1010 uap->curregs[5] &= ~TxN_MASK;
1011
1012 switch (cflag & CSIZE) {
1013 case CS5:
1014 uap->curregs[3] |= Rx5;
1015 uap->curregs[5] |= Tx5;
1016 uap->parity_mask = 0x1f;
1017 break;
1018 case CS6:
1019 uap->curregs[3] |= Rx6;
1020 uap->curregs[5] |= Tx6;
1021 uap->parity_mask = 0x3f;
1022 break;
1023 case CS7:
1024 uap->curregs[3] |= Rx7;
1025 uap->curregs[5] |= Tx7;
1026 uap->parity_mask = 0x7f;
1027 break;
1028 case CS8:
1029 default:
1030 uap->curregs[3] |= Rx8;
1031 uap->curregs[5] |= Tx8;
1032 uap->parity_mask = 0xff;
1033 break;
1034 }
1035 uap->curregs[4] &= ~(SB_MASK);
1036 if (cflag & CSTOPB)
1037 uap->curregs[4] |= SB2;
1038 else
1039 uap->curregs[4] |= SB1;
1040 if (cflag & PARENB)
1041 uap->curregs[4] |= PAR_ENAB;
1042 else
1043 uap->curregs[4] &= ~PAR_ENAB;
1044 if (!(cflag & PARODD))
1045 uap->curregs[4] |= PAR_EVEN;
1046 else
1047 uap->curregs[4] &= ~PAR_EVEN;
1048
1049 uap->port.read_status_mask = Rx_OVR;
1050 if (iflag & INPCK)
1051 uap->port.read_status_mask |= CRC_ERR | PAR_ERR;
1052 if (iflag & (IGNBRK | BRKINT | PARMRK))
1053 uap->port.read_status_mask |= BRK_ABRT;
1054
1055 uap->port.ignore_status_mask = 0;
1056 if (iflag & IGNPAR)
1057 uap->port.ignore_status_mask |= CRC_ERR | PAR_ERR;
1058 if (iflag & IGNBRK) {
1059 uap->port.ignore_status_mask |= BRK_ABRT;
1060 if (iflag & IGNPAR)
1061 uap->port.ignore_status_mask |= Rx_OVR;
1062 }
1063
1064 if ((cflag & CREAD) == 0)
1065 uap->port.ignore_status_mask = 0xff;
1066}
1067
1068
1069/*
1070 * Set the irda codec on the imac to the specified baud rate.
1071 */
1072static void pmz_irda_setup(struct uart_pmac_port *uap, unsigned long *baud)
1073{
1074 u8 cmdbyte;
1075 int t, version;
1076
1077 switch (*baud) {
1078 /* SIR modes */
1079 case 2400:
1080 cmdbyte = 0x53;
1081 break;
1082 case 4800:
1083 cmdbyte = 0x52;
1084 break;
1085 case 9600:
1086 cmdbyte = 0x51;
1087 break;
1088 case 19200:
1089 cmdbyte = 0x50;
1090 break;
1091 case 38400:
1092 cmdbyte = 0x4f;
1093 break;
1094 case 57600:
1095 cmdbyte = 0x4e;
1096 break;
1097 case 115200:
1098 cmdbyte = 0x4d;
1099 break;
1100 /* The FIR modes aren't really supported at this point, how
1101 * do we select the speed ? via the FCR on KeyLargo ?
1102 */
1103 case 1152000:
1104 cmdbyte = 0;
1105 break;
1106 case 4000000:
1107 cmdbyte = 0;
1108 break;
1109 default: /* 9600 */
1110 cmdbyte = 0x51;
1111 *baud = 9600;
1112 break;
1113 }
1114
1115 /* Wait for transmitter to drain */
1116 t = 10000;
1117 while ((read_zsreg(uap, R0) & Tx_BUF_EMP) == 0
1118 || (read_zsreg(uap, R1) & ALL_SNT) == 0) {
1119 if (--t <= 0) {
1120 pmz_error("transmitter didn't drain\n");
1121 return;
1122 }
1123 udelay(10);
1124 }
1125
1126 /* Drain the receiver too */
1127 t = 100;
1128 (void)read_zsdata(uap);
1129 (void)read_zsdata(uap);
1130 (void)read_zsdata(uap);
1131 mdelay(10);
1132 while (read_zsreg(uap, R0) & Rx_CH_AV) {
1133 read_zsdata(uap);
1134 mdelay(10);
1135 if (--t <= 0) {
1136 pmz_error("receiver didn't drain\n");
1137 return;
1138 }
1139 }
1140
1141 /* Switch to command mode */
1142 uap->curregs[R5] |= DTR;
1143 write_zsreg(uap, R5, uap->curregs[R5]);
1144 zssync(uap);
1145 mdelay(1);
1146
1147 /* Switch SCC to 19200 */
1148 pmz_convert_to_zs(uap, CS8, 0, 19200);
1149 pmz_load_zsregs(uap, uap->curregs);
1150 mdelay(1);
1151
1152 /* Write get_version command byte */
1153 write_zsdata(uap, 1);
1154 t = 5000;
1155 while ((read_zsreg(uap, R0) & Rx_CH_AV) == 0) {
1156 if (--t <= 0) {
1157 pmz_error("irda_setup timed out on get_version byte\n");
1158 goto out;
1159 }
1160 udelay(10);
1161 }
1162 version = read_zsdata(uap);
1163
1164 if (version < 4) {
1165 pmz_info("IrDA: dongle version %d not supported\n", version);
1166 goto out;
1167 }
1168
1169 /* Send speed mode */
1170 write_zsdata(uap, cmdbyte);
1171 t = 5000;
1172 while ((read_zsreg(uap, R0) & Rx_CH_AV) == 0) {
1173 if (--t <= 0) {
1174 pmz_error("irda_setup timed out on speed mode byte\n");
1175 goto out;
1176 }
1177 udelay(10);
1178 }
1179 t = read_zsdata(uap);
1180 if (t != cmdbyte)
1181 pmz_error("irda_setup speed mode byte = %x (%x)\n", t, cmdbyte);
1182
1183 pmz_info("IrDA setup for %ld bps, dongle version: %d\n",
1184 *baud, version);
1185
1186 (void)read_zsdata(uap);
1187 (void)read_zsdata(uap);
1188 (void)read_zsdata(uap);
1189
1190 out:
1191 /* Switch back to data mode */
1192 uap->curregs[R5] &= ~DTR;
1193 write_zsreg(uap, R5, uap->curregs[R5]);
1194 zssync(uap);
1195
1196 (void)read_zsdata(uap);
1197 (void)read_zsdata(uap);
1198 (void)read_zsdata(uap);
1199}
1200
1201
1202static void __pmz_set_termios(struct uart_port *port, struct ktermios *termios,
1203 const struct ktermios *old)
1204{
1205 struct uart_pmac_port *uap = to_pmz(port);
1206 unsigned long baud;
1207
1208 /* XXX Check which revs of machines actually allow 1 and 4Mb speeds
1209 * on the IR dongle. Note that the IRTTY driver currently doesn't know
1210 * about the FIR mode and high speed modes. So these are unused. For
1211 * implementing proper support for these, we should probably add some
1212 * DMA as well, at least on the Rx side, which isn't a simple thing
1213 * at this point.
1214 */
1215 if (ZS_IS_IRDA(uap)) {
1216 /* Calc baud rate */
1217 baud = uart_get_baud_rate(port, termios, old, 1200, 4000000);
1218 pmz_debug("pmz: switch IRDA to %ld bauds\n", baud);
1219 /* Cet the irda codec to the right rate */
1220 pmz_irda_setup(uap, &baud);
1221 /* Set final baud rate */
1222 pmz_convert_to_zs(uap, termios->c_cflag, termios->c_iflag, baud);
1223 pmz_load_zsregs(uap, uap->curregs);
1224 zssync(uap);
1225 } else {
1226 baud = uart_get_baud_rate(port, termios, old, 1200, 230400);
1227 pmz_convert_to_zs(uap, termios->c_cflag, termios->c_iflag, baud);
1228 /* Make sure modem status interrupts are correctly configured */
1229 if (UART_ENABLE_MS(&uap->port, termios->c_cflag)) {
1230 uap->curregs[R15] |= DCDIE | SYNCIE | CTSIE;
1231 uap->flags |= PMACZILOG_FLAG_MODEM_STATUS;
1232 } else {
1233 uap->curregs[R15] &= ~(DCDIE | SYNCIE | CTSIE);
1234 uap->flags &= ~PMACZILOG_FLAG_MODEM_STATUS;
1235 }
1236
1237 /* Load registers to the chip */
1238 pmz_maybe_update_regs(uap);
1239 }
1240 uart_update_timeout(port, termios->c_cflag, baud);
1241}
1242
1243/* The port lock is not held. */
1244static void pmz_set_termios(struct uart_port *port, struct ktermios *termios,
1245 const struct ktermios *old)
1246{
1247 struct uart_pmac_port *uap = to_pmz(port);
1248 unsigned long flags;
1249
1250 uart_port_lock_irqsave(port, &flags);
1251
1252 /* Disable IRQs on the port */
1253 pmz_interrupt_control(uap, 0);
1254
1255 /* Setup new port configuration */
1256 __pmz_set_termios(port, termios, old);
1257
1258 /* Re-enable IRQs on the port */
1259 if (ZS_IS_OPEN(uap))
1260 pmz_interrupt_control(uap, 1);
1261
1262 uart_port_unlock_irqrestore(port, flags);
1263}
1264
1265static const char *pmz_type(struct uart_port *port)
1266{
1267 struct uart_pmac_port *uap = to_pmz(port);
1268
1269 if (ZS_IS_IRDA(uap))
1270 return "Z85c30 ESCC - Infrared port";
1271 else if (ZS_IS_INTMODEM(uap))
1272 return "Z85c30 ESCC - Internal modem";
1273 return "Z85c30 ESCC - Serial port";
1274}
1275
1276/* We do not request/release mappings of the registers here, this
1277 * happens at early serial probe time.
1278 */
1279static void pmz_release_port(struct uart_port *port)
1280{
1281}
1282
1283static int pmz_request_port(struct uart_port *port)
1284{
1285 return 0;
1286}
1287
1288/* These do not need to do anything interesting either. */
1289static void pmz_config_port(struct uart_port *port, int flags)
1290{
1291}
1292
1293/* We do not support letting the user mess with the divisor, IRQ, etc. */
1294static int pmz_verify_port(struct uart_port *port, struct serial_struct *ser)
1295{
1296 return -EINVAL;
1297}
1298
1299#ifdef CONFIG_CONSOLE_POLL
1300
1301static int pmz_poll_get_char(struct uart_port *port)
1302{
1303 struct uart_pmac_port *uap =
1304 container_of(port, struct uart_pmac_port, port);
1305 int tries = 2;
1306
1307 while (tries) {
1308 if ((read_zsreg(uap, R0) & Rx_CH_AV) != 0)
1309 return read_zsdata(uap);
1310 if (tries--)
1311 udelay(5);
1312 }
1313
1314 return NO_POLL_CHAR;
1315}
1316
1317static void pmz_poll_put_char(struct uart_port *port, unsigned char c)
1318{
1319 struct uart_pmac_port *uap =
1320 container_of(port, struct uart_pmac_port, port);
1321
1322 /* Wait for the transmit buffer to empty. */
1323 while ((read_zsreg(uap, R0) & Tx_BUF_EMP) == 0)
1324 udelay(5);
1325 write_zsdata(uap, c);
1326}
1327
1328#endif /* CONFIG_CONSOLE_POLL */
1329
1330static const struct uart_ops pmz_pops = {
1331 .tx_empty = pmz_tx_empty,
1332 .set_mctrl = pmz_set_mctrl,
1333 .get_mctrl = pmz_get_mctrl,
1334 .stop_tx = pmz_stop_tx,
1335 .start_tx = pmz_start_tx,
1336 .stop_rx = pmz_stop_rx,
1337 .enable_ms = pmz_enable_ms,
1338 .break_ctl = pmz_break_ctl,
1339 .startup = pmz_startup,
1340 .shutdown = pmz_shutdown,
1341 .set_termios = pmz_set_termios,
1342 .type = pmz_type,
1343 .release_port = pmz_release_port,
1344 .request_port = pmz_request_port,
1345 .config_port = pmz_config_port,
1346 .verify_port = pmz_verify_port,
1347#ifdef CONFIG_CONSOLE_POLL
1348 .poll_get_char = pmz_poll_get_char,
1349 .poll_put_char = pmz_poll_put_char,
1350#endif
1351};
1352
1353#ifdef CONFIG_PPC_PMAC
1354
1355/*
1356 * Setup one port structure after probing, HW is down at this point,
1357 * Unlike sunzilog, we don't need to pre-init the spinlock as we don't
1358 * register our console before uart_add_one_port() is called
1359 */
1360static int __init pmz_init_port(struct uart_pmac_port *uap)
1361{
1362 struct device_node *np = uap->node;
1363 const char *conn;
1364 const struct slot_names_prop {
1365 int count;
1366 char name[1];
1367 } *slots;
1368 int len;
1369 struct resource r_ports;
1370
1371 /*
1372 * Request & map chip registers
1373 */
1374 if (of_address_to_resource(np, 0, &r_ports))
1375 return -ENODEV;
1376 uap->port.mapbase = r_ports.start;
1377 uap->port.membase = ioremap(uap->port.mapbase, 0x1000);
1378
1379 uap->control_reg = uap->port.membase;
1380 uap->data_reg = uap->control_reg + 0x10;
1381
1382 /*
1383 * Detect port type
1384 */
1385 if (of_device_is_compatible(np, "cobalt"))
1386 uap->flags |= PMACZILOG_FLAG_IS_INTMODEM;
1387 conn = of_get_property(np, "AAPL,connector", &len);
1388 if (conn && (strcmp(conn, "infrared") == 0))
1389 uap->flags |= PMACZILOG_FLAG_IS_IRDA;
1390 uap->port_type = PMAC_SCC_ASYNC;
1391 /* 1999 Powerbook G3 has slot-names property instead */
1392 slots = of_get_property(np, "slot-names", &len);
1393 if (slots && slots->count > 0) {
1394 if (strcmp(slots->name, "IrDA") == 0)
1395 uap->flags |= PMACZILOG_FLAG_IS_IRDA;
1396 else if (strcmp(slots->name, "Modem") == 0)
1397 uap->flags |= PMACZILOG_FLAG_IS_INTMODEM;
1398 }
1399 if (ZS_IS_IRDA(uap))
1400 uap->port_type = PMAC_SCC_IRDA;
1401 if (ZS_IS_INTMODEM(uap)) {
1402 struct device_node* i2c_modem =
1403 of_find_node_by_name(NULL, "i2c-modem");
1404 if (i2c_modem) {
1405 const char* mid =
1406 of_get_property(i2c_modem, "modem-id", NULL);
1407 if (mid) switch(*mid) {
1408 case 0x04 :
1409 case 0x05 :
1410 case 0x07 :
1411 case 0x08 :
1412 case 0x0b :
1413 case 0x0c :
1414 uap->port_type = PMAC_SCC_I2S1;
1415 }
1416 printk(KERN_INFO "pmac_zilog: i2c-modem detected, id: %d\n",
1417 mid ? (*mid) : 0);
1418 of_node_put(i2c_modem);
1419 } else {
1420 printk(KERN_INFO "pmac_zilog: serial modem detected\n");
1421 }
1422 }
1423
1424 /*
1425 * Init remaining bits of "port" structure
1426 */
1427 uap->port.iotype = UPIO_MEM;
1428 uap->port.irq = irq_of_parse_and_map(np, 0);
1429 uap->port.uartclk = ZS_CLOCK;
1430 uap->port.fifosize = 1;
1431 uap->port.ops = &pmz_pops;
1432 uap->port.type = PORT_PMAC_ZILOG;
1433 uap->port.flags = 0;
1434
1435 /*
1436 * Fixup for the port on Gatwick for which the device-tree has
1437 * missing interrupts. Normally, the macio_dev would contain
1438 * fixed up interrupt info, but we use the device-tree directly
1439 * here due to early probing so we need the fixup too.
1440 */
1441 if (uap->port.irq == 0 &&
1442 np->parent && np->parent->parent &&
1443 of_device_is_compatible(np->parent->parent, "gatwick")) {
1444 /* IRQs on gatwick are offset by 64 */
1445 uap->port.irq = irq_create_mapping(NULL, 64 + 15);
1446 }
1447
1448 /* Setup some valid baud rate information in the register
1449 * shadows so we don't write crap there before baud rate is
1450 * first initialized.
1451 */
1452 pmz_convert_to_zs(uap, CS8, 0, 9600);
1453
1454 return 0;
1455}
1456
1457/*
1458 * Get rid of a port on module removal
1459 */
1460static void pmz_dispose_port(struct uart_pmac_port *uap)
1461{
1462 struct device_node *np;
1463
1464 np = uap->node;
1465 iounmap(uap->control_reg);
1466 uap->node = NULL;
1467 of_node_put(np);
1468 memset(uap, 0, sizeof(struct uart_pmac_port));
1469}
1470
1471/*
1472 * Called upon match with an escc node in the device-tree.
1473 */
1474static int pmz_attach(struct macio_dev *mdev, const struct of_device_id *match)
1475{
1476 struct uart_pmac_port *uap;
1477 int i;
1478
1479 /* Iterate the pmz_ports array to find a matching entry
1480 */
1481 for (i = 0; i < MAX_ZS_PORTS; i++)
1482 if (pmz_ports[i].node == mdev->ofdev.dev.of_node)
1483 break;
1484 if (i >= MAX_ZS_PORTS)
1485 return -ENODEV;
1486
1487
1488 uap = &pmz_ports[i];
1489 uap->dev = mdev;
1490 uap->port.dev = &mdev->ofdev.dev;
1491 dev_set_drvdata(&mdev->ofdev.dev, uap);
1492
1493 /* We still activate the port even when failing to request resources
1494 * to work around bugs in ancient Apple device-trees
1495 */
1496 if (macio_request_resources(uap->dev, "pmac_zilog"))
1497 printk(KERN_WARNING "%pOFn: Failed to request resource"
1498 ", port still active\n",
1499 uap->node);
1500 else
1501 uap->flags |= PMACZILOG_FLAG_RSRC_REQUESTED;
1502
1503 return uart_add_one_port(&pmz_uart_reg, &uap->port);
1504}
1505
1506/*
1507 * That one should not be called, macio isn't really a hotswap device,
1508 * we don't expect one of those serial ports to go away...
1509 */
1510static int pmz_detach(struct macio_dev *mdev)
1511{
1512 struct uart_pmac_port *uap = dev_get_drvdata(&mdev->ofdev.dev);
1513
1514 if (!uap)
1515 return -ENODEV;
1516
1517 uart_remove_one_port(&pmz_uart_reg, &uap->port);
1518
1519 if (uap->flags & PMACZILOG_FLAG_RSRC_REQUESTED) {
1520 macio_release_resources(uap->dev);
1521 uap->flags &= ~PMACZILOG_FLAG_RSRC_REQUESTED;
1522 }
1523 dev_set_drvdata(&mdev->ofdev.dev, NULL);
1524 uap->dev = NULL;
1525 uap->port.dev = NULL;
1526
1527 return 0;
1528}
1529
1530
1531static int pmz_suspend(struct macio_dev *mdev, pm_message_t pm_state)
1532{
1533 struct uart_pmac_port *uap = dev_get_drvdata(&mdev->ofdev.dev);
1534
1535 if (uap == NULL) {
1536 printk("HRM... pmz_suspend with NULL uap\n");
1537 return 0;
1538 }
1539
1540 uart_suspend_port(&pmz_uart_reg, &uap->port);
1541
1542 return 0;
1543}
1544
1545
1546static int pmz_resume(struct macio_dev *mdev)
1547{
1548 struct uart_pmac_port *uap = dev_get_drvdata(&mdev->ofdev.dev);
1549
1550 if (uap == NULL)
1551 return 0;
1552
1553 uart_resume_port(&pmz_uart_reg, &uap->port);
1554
1555 return 0;
1556}
1557
1558/*
1559 * Probe all ports in the system and build the ports array, we register
1560 * with the serial layer later, so we get a proper struct device which
1561 * allows the tty to attach properly. This is later than it used to be
1562 * but the tty layer really wants it that way.
1563 */
1564static int __init pmz_probe(void)
1565{
1566 struct device_node *node_p, *node_a, *node_b, *np;
1567 int count = 0;
1568 int rc;
1569
1570 /*
1571 * Find all escc chips in the system
1572 */
1573 for_each_node_by_name(node_p, "escc") {
1574 /*
1575 * First get channel A/B node pointers
1576 *
1577 * TODO: Add routines with proper locking to do that...
1578 */
1579 node_a = node_b = NULL;
1580 for_each_child_of_node(node_p, np) {
1581 if (of_node_name_prefix(np, "ch-a"))
1582 node_a = of_node_get(np);
1583 else if (of_node_name_prefix(np, "ch-b"))
1584 node_b = of_node_get(np);
1585 }
1586 if (!node_a && !node_b) {
1587 of_node_put(node_a);
1588 of_node_put(node_b);
1589 printk(KERN_ERR "pmac_zilog: missing node %c for escc %pOF\n",
1590 (!node_a) ? 'a' : 'b', node_p);
1591 continue;
1592 }
1593
1594 /*
1595 * Fill basic fields in the port structures
1596 */
1597 if (node_b != NULL) {
1598 pmz_ports[count].mate = &pmz_ports[count+1];
1599 pmz_ports[count+1].mate = &pmz_ports[count];
1600 }
1601 pmz_ports[count].flags = PMACZILOG_FLAG_IS_CHANNEL_A;
1602 pmz_ports[count].node = node_a;
1603 pmz_ports[count+1].node = node_b;
1604 pmz_ports[count].port.line = count;
1605 pmz_ports[count+1].port.line = count+1;
1606
1607 /*
1608 * Setup the ports for real
1609 */
1610 rc = pmz_init_port(&pmz_ports[count]);
1611 if (rc == 0 && node_b != NULL)
1612 rc = pmz_init_port(&pmz_ports[count+1]);
1613 if (rc != 0) {
1614 of_node_put(node_a);
1615 of_node_put(node_b);
1616 memset(&pmz_ports[count], 0, sizeof(struct uart_pmac_port));
1617 memset(&pmz_ports[count+1], 0, sizeof(struct uart_pmac_port));
1618 continue;
1619 }
1620 count += 2;
1621 }
1622 pmz_ports_count = count;
1623
1624 return 0;
1625}
1626
1627#else
1628
1629/* On PCI PowerMacs, pmz_probe() does an explicit search of the OpenFirmware
1630 * tree to obtain the device_nodes needed to start the console before the
1631 * macio driver. On Macs without OpenFirmware, global platform_devices take
1632 * the place of those device_nodes.
1633 */
1634extern struct platform_device scc_a_pdev, scc_b_pdev;
1635
1636static int __init pmz_init_port(struct uart_pmac_port *uap)
1637{
1638 struct resource *r_ports;
1639 int irq;
1640
1641 r_ports = platform_get_resource(uap->pdev, IORESOURCE_MEM, 0);
1642 if (!r_ports)
1643 return -ENODEV;
1644
1645 irq = platform_get_irq(uap->pdev, 0);
1646 if (irq < 0)
1647 return irq;
1648
1649 uap->port.mapbase = r_ports->start;
1650 uap->port.membase = (unsigned char __iomem *) r_ports->start;
1651 uap->port.iotype = UPIO_MEM;
1652 uap->port.irq = irq;
1653 uap->port.uartclk = ZS_CLOCK;
1654 uap->port.fifosize = 1;
1655 uap->port.ops = &pmz_pops;
1656 uap->port.type = PORT_PMAC_ZILOG;
1657 uap->port.flags = 0;
1658
1659 uap->control_reg = uap->port.membase;
1660 uap->data_reg = uap->control_reg + 4;
1661 uap->port_type = 0;
1662 uap->port.has_sysrq = IS_ENABLED(CONFIG_SERIAL_PMACZILOG_CONSOLE);
1663
1664 pmz_convert_to_zs(uap, CS8, 0, 9600);
1665
1666 return 0;
1667}
1668
1669static int __init pmz_probe(void)
1670{
1671 int err;
1672
1673 pmz_ports_count = 0;
1674
1675 pmz_ports[0].port.line = 0;
1676 pmz_ports[0].flags = PMACZILOG_FLAG_IS_CHANNEL_A;
1677 pmz_ports[0].pdev = &scc_a_pdev;
1678 err = pmz_init_port(&pmz_ports[0]);
1679 if (err)
1680 return err;
1681 pmz_ports_count++;
1682
1683 pmz_ports[0].mate = &pmz_ports[1];
1684 pmz_ports[1].mate = &pmz_ports[0];
1685 pmz_ports[1].port.line = 1;
1686 pmz_ports[1].flags = 0;
1687 pmz_ports[1].pdev = &scc_b_pdev;
1688 err = pmz_init_port(&pmz_ports[1]);
1689 if (err)
1690 return err;
1691 pmz_ports_count++;
1692
1693 return 0;
1694}
1695
1696static void pmz_dispose_port(struct uart_pmac_port *uap)
1697{
1698 memset(uap, 0, sizeof(struct uart_pmac_port));
1699}
1700
1701static int __init pmz_attach(struct platform_device *pdev)
1702{
1703 struct uart_pmac_port *uap;
1704 int i;
1705
1706 /* Iterate the pmz_ports array to find a matching entry */
1707 for (i = 0; i < pmz_ports_count; i++)
1708 if (pmz_ports[i].pdev == pdev)
1709 break;
1710 if (i >= pmz_ports_count)
1711 return -ENODEV;
1712
1713 uap = &pmz_ports[i];
1714 uap->port.dev = &pdev->dev;
1715 platform_set_drvdata(pdev, uap);
1716
1717 return uart_add_one_port(&pmz_uart_reg, &uap->port);
1718}
1719
1720static int __exit pmz_detach(struct platform_device *pdev)
1721{
1722 struct uart_pmac_port *uap = platform_get_drvdata(pdev);
1723
1724 if (!uap)
1725 return -ENODEV;
1726
1727 uart_remove_one_port(&pmz_uart_reg, &uap->port);
1728
1729 uap->port.dev = NULL;
1730
1731 return 0;
1732}
1733
1734#endif /* !CONFIG_PPC_PMAC */
1735
1736#ifdef CONFIG_SERIAL_PMACZILOG_CONSOLE
1737
1738static void pmz_console_write(struct console *con, const char *s, unsigned int count);
1739static int __init pmz_console_setup(struct console *co, char *options);
1740
1741static struct console pmz_console = {
1742 .name = PMACZILOG_NAME,
1743 .write = pmz_console_write,
1744 .device = uart_console_device,
1745 .setup = pmz_console_setup,
1746 .flags = CON_PRINTBUFFER,
1747 .index = -1,
1748 .data = &pmz_uart_reg,
1749};
1750
1751#define PMACZILOG_CONSOLE &pmz_console
1752#else /* CONFIG_SERIAL_PMACZILOG_CONSOLE */
1753#define PMACZILOG_CONSOLE (NULL)
1754#endif /* CONFIG_SERIAL_PMACZILOG_CONSOLE */
1755
1756/*
1757 * Register the driver, console driver and ports with the serial
1758 * core
1759 */
1760static int __init pmz_register(void)
1761{
1762 pmz_uart_reg.nr = pmz_ports_count;
1763 pmz_uart_reg.cons = PMACZILOG_CONSOLE;
1764
1765 /*
1766 * Register this driver with the serial core
1767 */
1768 return uart_register_driver(&pmz_uart_reg);
1769}
1770
1771#ifdef CONFIG_PPC_PMAC
1772
1773static const struct of_device_id pmz_match[] =
1774{
1775 {
1776 .name = "ch-a",
1777 },
1778 {
1779 .name = "ch-b",
1780 },
1781 {},
1782};
1783MODULE_DEVICE_TABLE (of, pmz_match);
1784
1785static struct macio_driver pmz_driver = {
1786 .driver = {
1787 .name = "pmac_zilog",
1788 .owner = THIS_MODULE,
1789 .of_match_table = pmz_match,
1790 },
1791 .probe = pmz_attach,
1792 .remove = pmz_detach,
1793 .suspend = pmz_suspend,
1794 .resume = pmz_resume,
1795};
1796
1797#else
1798
1799static struct platform_driver pmz_driver = {
1800 .remove = __exit_p(pmz_detach),
1801 .driver = {
1802 .name = "scc",
1803 },
1804};
1805
1806#endif /* !CONFIG_PPC_PMAC */
1807
1808static int __init init_pmz(void)
1809{
1810 int rc, i;
1811
1812 /*
1813 * First, we need to do a direct OF-based probe pass. We
1814 * do that because we want serial console up before the
1815 * macio stuffs calls us back, and since that makes it
1816 * easier to pass the proper number of channels to
1817 * uart_register_driver()
1818 */
1819 if (pmz_ports_count == 0)
1820 pmz_probe();
1821
1822 /*
1823 * Bail early if no port found
1824 */
1825 if (pmz_ports_count == 0)
1826 return -ENODEV;
1827
1828 /*
1829 * Now we register with the serial layer
1830 */
1831 rc = pmz_register();
1832 if (rc) {
1833 printk(KERN_ERR
1834 "pmac_zilog: Error registering serial device, disabling pmac_zilog.\n"
1835 "pmac_zilog: Did another serial driver already claim the minors?\n");
1836 /* effectively "pmz_unprobe()" */
1837 for (i=0; i < pmz_ports_count; i++)
1838 pmz_dispose_port(&pmz_ports[i]);
1839 return rc;
1840 }
1841
1842 /*
1843 * Then we register the macio driver itself
1844 */
1845#ifdef CONFIG_PPC_PMAC
1846 return macio_register_driver(&pmz_driver);
1847#else
1848 return platform_driver_probe(&pmz_driver, pmz_attach);
1849#endif
1850}
1851
1852static void __exit exit_pmz(void)
1853{
1854 int i;
1855
1856#ifdef CONFIG_PPC_PMAC
1857 /* Get rid of macio-driver (detach from macio) */
1858 macio_unregister_driver(&pmz_driver);
1859#else
1860 platform_driver_unregister(&pmz_driver);
1861#endif
1862
1863 for (i = 0; i < pmz_ports_count; i++) {
1864 struct uart_pmac_port *uport = &pmz_ports[i];
1865#ifdef CONFIG_PPC_PMAC
1866 if (uport->node != NULL)
1867 pmz_dispose_port(uport);
1868#else
1869 if (uport->pdev != NULL)
1870 pmz_dispose_port(uport);
1871#endif
1872 }
1873 /* Unregister UART driver */
1874 uart_unregister_driver(&pmz_uart_reg);
1875}
1876
1877#ifdef CONFIG_SERIAL_PMACZILOG_CONSOLE
1878
1879static void pmz_console_putchar(struct uart_port *port, unsigned char ch)
1880{
1881 struct uart_pmac_port *uap =
1882 container_of(port, struct uart_pmac_port, port);
1883
1884 /* Wait for the transmit buffer to empty. */
1885 while ((read_zsreg(uap, R0) & Tx_BUF_EMP) == 0)
1886 udelay(5);
1887 write_zsdata(uap, ch);
1888}
1889
1890/*
1891 * Print a string to the serial port trying not to disturb
1892 * any possible real use of the port...
1893 */
1894static void pmz_console_write(struct console *con, const char *s, unsigned int count)
1895{
1896 struct uart_pmac_port *uap = &pmz_ports[con->index];
1897 unsigned long flags;
1898
1899 uart_port_lock_irqsave(&uap->port, &flags);
1900
1901 /* Turn of interrupts and enable the transmitter. */
1902 write_zsreg(uap, R1, uap->curregs[1] & ~TxINT_ENAB);
1903 write_zsreg(uap, R5, uap->curregs[5] | TxENABLE | RTS | DTR);
1904
1905 uart_console_write(&uap->port, s, count, pmz_console_putchar);
1906
1907 /* Restore the values in the registers. */
1908 write_zsreg(uap, R1, uap->curregs[1]);
1909 /* Don't disable the transmitter. */
1910
1911 uart_port_unlock_irqrestore(&uap->port, flags);
1912}
1913
1914/*
1915 * Setup the serial console
1916 */
1917static int __init pmz_console_setup(struct console *co, char *options)
1918{
1919 struct uart_pmac_port *uap;
1920 struct uart_port *port;
1921 int baud = 38400;
1922 int bits = 8;
1923 int parity = 'n';
1924 int flow = 'n';
1925 unsigned long pwr_delay;
1926
1927 /*
1928 * XServe's default to 57600 bps
1929 */
1930 if (of_machine_is_compatible("RackMac1,1")
1931 || of_machine_is_compatible("RackMac1,2")
1932 || of_machine_is_compatible("MacRISC4"))
1933 baud = 57600;
1934
1935 /*
1936 * Check whether an invalid uart number has been specified, and
1937 * if so, search for the first available port that does have
1938 * console support.
1939 */
1940 if (co->index >= pmz_ports_count)
1941 co->index = 0;
1942 uap = &pmz_ports[co->index];
1943#ifdef CONFIG_PPC_PMAC
1944 if (uap->node == NULL)
1945 return -ENODEV;
1946#else
1947 if (uap->pdev == NULL)
1948 return -ENODEV;
1949#endif
1950 port = &uap->port;
1951
1952 /*
1953 * Mark port as beeing a console
1954 */
1955 uap->flags |= PMACZILOG_FLAG_IS_CONS;
1956
1957 /*
1958 * Temporary fix for uart layer who didn't setup the spinlock yet
1959 */
1960 spin_lock_init(&port->lock);
1961
1962 /*
1963 * Enable the hardware
1964 */
1965 pwr_delay = __pmz_startup(uap);
1966 if (pwr_delay)
1967 mdelay(pwr_delay);
1968
1969 if (options)
1970 uart_parse_options(options, &baud, &parity, &bits, &flow);
1971
1972 return uart_set_options(port, co, baud, parity, bits, flow);
1973}
1974
1975static int __init pmz_console_init(void)
1976{
1977 /* Probe ports */
1978 pmz_probe();
1979
1980 if (pmz_ports_count == 0)
1981 return -ENODEV;
1982
1983 /* TODO: Autoprobe console based on OF */
1984 /* pmz_console.index = i; */
1985 register_console(&pmz_console);
1986
1987 return 0;
1988
1989}
1990console_initcall(pmz_console_init);
1991#endif /* CONFIG_SERIAL_PMACZILOG_CONSOLE */
1992
1993module_init(init_pmz);
1994module_exit(exit_pmz);
1/*
2 * Driver for PowerMac Z85c30 based ESCC cell found in the
3 * "macio" ASICs of various PowerMac models
4 *
5 * Copyright (C) 2003 Ben. Herrenschmidt (benh@kernel.crashing.org)
6 *
7 * Derived from drivers/macintosh/macserial.c by Paul Mackerras
8 * and drivers/serial/sunzilog.c by David S. Miller
9 *
10 * Hrm... actually, I ripped most of sunzilog (Thanks David !) and
11 * adapted special tweaks needed for us. I don't think it's worth
12 * merging back those though. The DMA code still has to get in
13 * and once done, I expect that driver to remain fairly stable in
14 * the long term, unless we change the driver model again...
15 *
16 * This program is free software; you can redistribute it and/or modify
17 * it under the terms of the GNU General Public License as published by
18 * the Free Software Foundation; either version 2 of the License, or
19 * (at your option) any later version.
20 *
21 * This program is distributed in the hope that it will be useful,
22 * but WITHOUT ANY WARRANTY; without even the implied warranty of
23 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
24 * GNU General Public License for more details.
25 *
26 * You should have received a copy of the GNU General Public License
27 * along with this program; if not, write to the Free Software
28 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
29 *
30 * 2004-08-06 Harald Welte <laforge@gnumonks.org>
31 * - Enable BREAK interrupt
32 * - Add support for sysreq
33 *
34 * TODO: - Add DMA support
35 * - Defer port shutdown to a few seconds after close
36 * - maybe put something right into uap->clk_divisor
37 */
38
39#undef DEBUG
40#undef DEBUG_HARD
41#undef USE_CTRL_O_SYSRQ
42
43#include <linux/module.h>
44#include <linux/tty.h>
45
46#include <linux/tty_flip.h>
47#include <linux/major.h>
48#include <linux/string.h>
49#include <linux/fcntl.h>
50#include <linux/mm.h>
51#include <linux/kernel.h>
52#include <linux/delay.h>
53#include <linux/init.h>
54#include <linux/console.h>
55#include <linux/adb.h>
56#include <linux/pmu.h>
57#include <linux/bitops.h>
58#include <linux/sysrq.h>
59#include <linux/mutex.h>
60#include <asm/sections.h>
61#include <asm/io.h>
62#include <asm/irq.h>
63
64#ifdef CONFIG_PPC_PMAC
65#include <asm/prom.h>
66#include <asm/machdep.h>
67#include <asm/pmac_feature.h>
68#include <asm/dbdma.h>
69#include <asm/macio.h>
70#else
71#include <linux/platform_device.h>
72#define of_machine_is_compatible(x) (0)
73#endif
74
75#if defined (CONFIG_SERIAL_PMACZILOG_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
76#define SUPPORT_SYSRQ
77#endif
78
79#include <linux/serial.h>
80#include <linux/serial_core.h>
81
82#include "pmac_zilog.h"
83
84/* Not yet implemented */
85#undef HAS_DBDMA
86
87static char version[] __initdata = "pmac_zilog: 0.6 (Benjamin Herrenschmidt <benh@kernel.crashing.org>)";
88MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>");
89MODULE_DESCRIPTION("Driver for the Mac and PowerMac serial ports.");
90MODULE_LICENSE("GPL");
91
92#ifdef CONFIG_SERIAL_PMACZILOG_TTYS
93#define PMACZILOG_MAJOR TTY_MAJOR
94#define PMACZILOG_MINOR 64
95#define PMACZILOG_NAME "ttyS"
96#else
97#define PMACZILOG_MAJOR 204
98#define PMACZILOG_MINOR 192
99#define PMACZILOG_NAME "ttyPZ"
100#endif
101
102#define pmz_debug(fmt, arg...) pr_debug("ttyPZ%d: " fmt, uap->port.line, ## arg)
103#define pmz_error(fmt, arg...) pr_err("ttyPZ%d: " fmt, uap->port.line, ## arg)
104#define pmz_info(fmt, arg...) pr_info("ttyPZ%d: " fmt, uap->port.line, ## arg)
105
106/*
107 * For the sake of early serial console, we can do a pre-probe
108 * (optional) of the ports at rather early boot time.
109 */
110static struct uart_pmac_port pmz_ports[MAX_ZS_PORTS];
111static int pmz_ports_count;
112
113static struct uart_driver pmz_uart_reg = {
114 .owner = THIS_MODULE,
115 .driver_name = PMACZILOG_NAME,
116 .dev_name = PMACZILOG_NAME,
117 .major = PMACZILOG_MAJOR,
118 .minor = PMACZILOG_MINOR,
119};
120
121
122/*
123 * Load all registers to reprogram the port
124 * This function must only be called when the TX is not busy. The UART
125 * port lock must be held and local interrupts disabled.
126 */
127static void pmz_load_zsregs(struct uart_pmac_port *uap, u8 *regs)
128{
129 int i;
130
131 /* Let pending transmits finish. */
132 for (i = 0; i < 1000; i++) {
133 unsigned char stat = read_zsreg(uap, R1);
134 if (stat & ALL_SNT)
135 break;
136 udelay(100);
137 }
138
139 ZS_CLEARERR(uap);
140 zssync(uap);
141 ZS_CLEARFIFO(uap);
142 zssync(uap);
143 ZS_CLEARERR(uap);
144
145 /* Disable all interrupts. */
146 write_zsreg(uap, R1,
147 regs[R1] & ~(RxINT_MASK | TxINT_ENAB | EXT_INT_ENAB));
148
149 /* Set parity, sync config, stop bits, and clock divisor. */
150 write_zsreg(uap, R4, regs[R4]);
151
152 /* Set misc. TX/RX control bits. */
153 write_zsreg(uap, R10, regs[R10]);
154
155 /* Set TX/RX controls sans the enable bits. */
156 write_zsreg(uap, R3, regs[R3] & ~RxENABLE);
157 write_zsreg(uap, R5, regs[R5] & ~TxENABLE);
158
159 /* now set R7 "prime" on ESCC */
160 write_zsreg(uap, R15, regs[R15] | EN85C30);
161 write_zsreg(uap, R7, regs[R7P]);
162
163 /* make sure we use R7 "non-prime" on ESCC */
164 write_zsreg(uap, R15, regs[R15] & ~EN85C30);
165
166 /* Synchronous mode config. */
167 write_zsreg(uap, R6, regs[R6]);
168 write_zsreg(uap, R7, regs[R7]);
169
170 /* Disable baud generator. */
171 write_zsreg(uap, R14, regs[R14] & ~BRENAB);
172
173 /* Clock mode control. */
174 write_zsreg(uap, R11, regs[R11]);
175
176 /* Lower and upper byte of baud rate generator divisor. */
177 write_zsreg(uap, R12, regs[R12]);
178 write_zsreg(uap, R13, regs[R13]);
179
180 /* Now rewrite R14, with BRENAB (if set). */
181 write_zsreg(uap, R14, regs[R14]);
182
183 /* Reset external status interrupts. */
184 write_zsreg(uap, R0, RES_EXT_INT);
185 write_zsreg(uap, R0, RES_EXT_INT);
186
187 /* Rewrite R3/R5, this time without enables masked. */
188 write_zsreg(uap, R3, regs[R3]);
189 write_zsreg(uap, R5, regs[R5]);
190
191 /* Rewrite R1, this time without IRQ enabled masked. */
192 write_zsreg(uap, R1, regs[R1]);
193
194 /* Enable interrupts */
195 write_zsreg(uap, R9, regs[R9]);
196}
197
198/*
199 * We do like sunzilog to avoid disrupting pending Tx
200 * Reprogram the Zilog channel HW registers with the copies found in the
201 * software state struct. If the transmitter is busy, we defer this update
202 * until the next TX complete interrupt. Else, we do it right now.
203 *
204 * The UART port lock must be held and local interrupts disabled.
205 */
206static void pmz_maybe_update_regs(struct uart_pmac_port *uap)
207{
208 if (!ZS_REGS_HELD(uap)) {
209 if (ZS_TX_ACTIVE(uap)) {
210 uap->flags |= PMACZILOG_FLAG_REGS_HELD;
211 } else {
212 pmz_debug("pmz: maybe_update_regs: updating\n");
213 pmz_load_zsregs(uap, uap->curregs);
214 }
215 }
216}
217
218static void pmz_interrupt_control(struct uart_pmac_port *uap, int enable)
219{
220 if (enable) {
221 uap->curregs[1] |= INT_ALL_Rx | TxINT_ENAB;
222 if (!ZS_IS_EXTCLK(uap))
223 uap->curregs[1] |= EXT_INT_ENAB;
224 } else {
225 uap->curregs[1] &= ~(EXT_INT_ENAB | TxINT_ENAB | RxINT_MASK);
226 }
227 write_zsreg(uap, R1, uap->curregs[1]);
228}
229
230static struct tty_struct *pmz_receive_chars(struct uart_pmac_port *uap)
231{
232 struct tty_struct *tty = NULL;
233 unsigned char ch, r1, drop, error, flag;
234 int loops = 0;
235
236 /* Sanity check, make sure the old bug is no longer happening */
237 if (uap->port.state == NULL || uap->port.state->port.tty == NULL) {
238 WARN_ON(1);
239 (void)read_zsdata(uap);
240 return NULL;
241 }
242 tty = uap->port.state->port.tty;
243
244 while (1) {
245 error = 0;
246 drop = 0;
247
248 r1 = read_zsreg(uap, R1);
249 ch = read_zsdata(uap);
250
251 if (r1 & (PAR_ERR | Rx_OVR | CRC_ERR)) {
252 write_zsreg(uap, R0, ERR_RES);
253 zssync(uap);
254 }
255
256 ch &= uap->parity_mask;
257 if (ch == 0 && uap->flags & PMACZILOG_FLAG_BREAK) {
258 uap->flags &= ~PMACZILOG_FLAG_BREAK;
259 }
260
261#if defined(CONFIG_MAGIC_SYSRQ) && defined(CONFIG_SERIAL_CORE_CONSOLE)
262#ifdef USE_CTRL_O_SYSRQ
263 /* Handle the SysRq ^O Hack */
264 if (ch == '\x0f') {
265 uap->port.sysrq = jiffies + HZ*5;
266 goto next_char;
267 }
268#endif /* USE_CTRL_O_SYSRQ */
269 if (uap->port.sysrq) {
270 int swallow;
271 spin_unlock(&uap->port.lock);
272 swallow = uart_handle_sysrq_char(&uap->port, ch);
273 spin_lock(&uap->port.lock);
274 if (swallow)
275 goto next_char;
276 }
277#endif /* CONFIG_MAGIC_SYSRQ && CONFIG_SERIAL_CORE_CONSOLE */
278
279 /* A real serial line, record the character and status. */
280 if (drop)
281 goto next_char;
282
283 flag = TTY_NORMAL;
284 uap->port.icount.rx++;
285
286 if (r1 & (PAR_ERR | Rx_OVR | CRC_ERR | BRK_ABRT)) {
287 error = 1;
288 if (r1 & BRK_ABRT) {
289 pmz_debug("pmz: got break !\n");
290 r1 &= ~(PAR_ERR | CRC_ERR);
291 uap->port.icount.brk++;
292 if (uart_handle_break(&uap->port))
293 goto next_char;
294 }
295 else if (r1 & PAR_ERR)
296 uap->port.icount.parity++;
297 else if (r1 & CRC_ERR)
298 uap->port.icount.frame++;
299 if (r1 & Rx_OVR)
300 uap->port.icount.overrun++;
301 r1 &= uap->port.read_status_mask;
302 if (r1 & BRK_ABRT)
303 flag = TTY_BREAK;
304 else if (r1 & PAR_ERR)
305 flag = TTY_PARITY;
306 else if (r1 & CRC_ERR)
307 flag = TTY_FRAME;
308 }
309
310 if (uap->port.ignore_status_mask == 0xff ||
311 (r1 & uap->port.ignore_status_mask) == 0) {
312 tty_insert_flip_char(tty, ch, flag);
313 }
314 if (r1 & Rx_OVR)
315 tty_insert_flip_char(tty, 0, TTY_OVERRUN);
316 next_char:
317 /* We can get stuck in an infinite loop getting char 0 when the
318 * line is in a wrong HW state, we break that here.
319 * When that happens, I disable the receive side of the driver.
320 * Note that what I've been experiencing is a real irq loop where
321 * I'm getting flooded regardless of the actual port speed.
322 * Something strange is going on with the HW
323 */
324 if ((++loops) > 1000)
325 goto flood;
326 ch = read_zsreg(uap, R0);
327 if (!(ch & Rx_CH_AV))
328 break;
329 }
330
331 return tty;
332 flood:
333 pmz_interrupt_control(uap, 0);
334 pmz_error("pmz: rx irq flood !\n");
335 return tty;
336}
337
338static void pmz_status_handle(struct uart_pmac_port *uap)
339{
340 unsigned char status;
341
342 status = read_zsreg(uap, R0);
343 write_zsreg(uap, R0, RES_EXT_INT);
344 zssync(uap);
345
346 if (ZS_IS_OPEN(uap) && ZS_WANTS_MODEM_STATUS(uap)) {
347 if (status & SYNC_HUNT)
348 uap->port.icount.dsr++;
349
350 /* The Zilog just gives us an interrupt when DCD/CTS/etc. change.
351 * But it does not tell us which bit has changed, we have to keep
352 * track of this ourselves.
353 * The CTS input is inverted for some reason. -- paulus
354 */
355 if ((status ^ uap->prev_status) & DCD)
356 uart_handle_dcd_change(&uap->port,
357 (status & DCD));
358 if ((status ^ uap->prev_status) & CTS)
359 uart_handle_cts_change(&uap->port,
360 !(status & CTS));
361
362 wake_up_interruptible(&uap->port.state->port.delta_msr_wait);
363 }
364
365 if (status & BRK_ABRT)
366 uap->flags |= PMACZILOG_FLAG_BREAK;
367
368 uap->prev_status = status;
369}
370
371static void pmz_transmit_chars(struct uart_pmac_port *uap)
372{
373 struct circ_buf *xmit;
374
375 if (ZS_IS_CONS(uap)) {
376 unsigned char status = read_zsreg(uap, R0);
377
378 /* TX still busy? Just wait for the next TX done interrupt.
379 *
380 * It can occur because of how we do serial console writes. It would
381 * be nice to transmit console writes just like we normally would for
382 * a TTY line. (ie. buffered and TX interrupt driven). That is not
383 * easy because console writes cannot sleep. One solution might be
384 * to poll on enough port->xmit space becoming free. -DaveM
385 */
386 if (!(status & Tx_BUF_EMP))
387 return;
388 }
389
390 uap->flags &= ~PMACZILOG_FLAG_TX_ACTIVE;
391
392 if (ZS_REGS_HELD(uap)) {
393 pmz_load_zsregs(uap, uap->curregs);
394 uap->flags &= ~PMACZILOG_FLAG_REGS_HELD;
395 }
396
397 if (ZS_TX_STOPPED(uap)) {
398 uap->flags &= ~PMACZILOG_FLAG_TX_STOPPED;
399 goto ack_tx_int;
400 }
401
402 /* Under some circumstances, we see interrupts reported for
403 * a closed channel. The interrupt mask in R1 is clear, but
404 * R3 still signals the interrupts and we see them when taking
405 * an interrupt for the other channel (this could be a qemu
406 * bug but since the ESCC doc doesn't specify precsiely whether
407 * R3 interrup status bits are masked by R1 interrupt enable
408 * bits, better safe than sorry). --BenH.
409 */
410 if (!ZS_IS_OPEN(uap))
411 goto ack_tx_int;
412
413 if (uap->port.x_char) {
414 uap->flags |= PMACZILOG_FLAG_TX_ACTIVE;
415 write_zsdata(uap, uap->port.x_char);
416 zssync(uap);
417 uap->port.icount.tx++;
418 uap->port.x_char = 0;
419 return;
420 }
421
422 if (uap->port.state == NULL)
423 goto ack_tx_int;
424 xmit = &uap->port.state->xmit;
425 if (uart_circ_empty(xmit)) {
426 uart_write_wakeup(&uap->port);
427 goto ack_tx_int;
428 }
429 if (uart_tx_stopped(&uap->port))
430 goto ack_tx_int;
431
432 uap->flags |= PMACZILOG_FLAG_TX_ACTIVE;
433 write_zsdata(uap, xmit->buf[xmit->tail]);
434 zssync(uap);
435
436 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
437 uap->port.icount.tx++;
438
439 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
440 uart_write_wakeup(&uap->port);
441
442 return;
443
444ack_tx_int:
445 write_zsreg(uap, R0, RES_Tx_P);
446 zssync(uap);
447}
448
449/* Hrm... we register that twice, fixme later.... */
450static irqreturn_t pmz_interrupt(int irq, void *dev_id)
451{
452 struct uart_pmac_port *uap = dev_id;
453 struct uart_pmac_port *uap_a;
454 struct uart_pmac_port *uap_b;
455 int rc = IRQ_NONE;
456 struct tty_struct *tty;
457 u8 r3;
458
459 uap_a = pmz_get_port_A(uap);
460 uap_b = uap_a->mate;
461
462 spin_lock(&uap_a->port.lock);
463 r3 = read_zsreg(uap_a, R3);
464
465#ifdef DEBUG_HARD
466 pmz_debug("irq, r3: %x\n", r3);
467#endif
468 /* Channel A */
469 tty = NULL;
470 if (r3 & (CHAEXT | CHATxIP | CHARxIP)) {
471 if (!ZS_IS_OPEN(uap_a)) {
472 pmz_debug("ChanA interrupt while not open !\n");
473 goto skip_a;
474 }
475 write_zsreg(uap_a, R0, RES_H_IUS);
476 zssync(uap_a);
477 if (r3 & CHAEXT)
478 pmz_status_handle(uap_a);
479 if (r3 & CHARxIP)
480 tty = pmz_receive_chars(uap_a);
481 if (r3 & CHATxIP)
482 pmz_transmit_chars(uap_a);
483 rc = IRQ_HANDLED;
484 }
485 skip_a:
486 spin_unlock(&uap_a->port.lock);
487 if (tty != NULL)
488 tty_flip_buffer_push(tty);
489
490 if (!uap_b)
491 goto out;
492
493 spin_lock(&uap_b->port.lock);
494 tty = NULL;
495 if (r3 & (CHBEXT | CHBTxIP | CHBRxIP)) {
496 if (!ZS_IS_OPEN(uap_b)) {
497 pmz_debug("ChanB interrupt while not open !\n");
498 goto skip_b;
499 }
500 write_zsreg(uap_b, R0, RES_H_IUS);
501 zssync(uap_b);
502 if (r3 & CHBEXT)
503 pmz_status_handle(uap_b);
504 if (r3 & CHBRxIP)
505 tty = pmz_receive_chars(uap_b);
506 if (r3 & CHBTxIP)
507 pmz_transmit_chars(uap_b);
508 rc = IRQ_HANDLED;
509 }
510 skip_b:
511 spin_unlock(&uap_b->port.lock);
512 if (tty != NULL)
513 tty_flip_buffer_push(tty);
514
515 out:
516 return rc;
517}
518
519/*
520 * Peek the status register, lock not held by caller
521 */
522static inline u8 pmz_peek_status(struct uart_pmac_port *uap)
523{
524 unsigned long flags;
525 u8 status;
526
527 spin_lock_irqsave(&uap->port.lock, flags);
528 status = read_zsreg(uap, R0);
529 spin_unlock_irqrestore(&uap->port.lock, flags);
530
531 return status;
532}
533
534/*
535 * Check if transmitter is empty
536 * The port lock is not held.
537 */
538static unsigned int pmz_tx_empty(struct uart_port *port)
539{
540 unsigned char status;
541
542 status = pmz_peek_status(to_pmz(port));
543 if (status & Tx_BUF_EMP)
544 return TIOCSER_TEMT;
545 return 0;
546}
547
548/*
549 * Set Modem Control (RTS & DTR) bits
550 * The port lock is held and interrupts are disabled.
551 * Note: Shall we really filter out RTS on external ports or
552 * should that be dealt at higher level only ?
553 */
554static void pmz_set_mctrl(struct uart_port *port, unsigned int mctrl)
555{
556 struct uart_pmac_port *uap = to_pmz(port);
557 unsigned char set_bits, clear_bits;
558
559 /* Do nothing for irda for now... */
560 if (ZS_IS_IRDA(uap))
561 return;
562 /* We get called during boot with a port not up yet */
563 if (!(ZS_IS_OPEN(uap) || ZS_IS_CONS(uap)))
564 return;
565
566 set_bits = clear_bits = 0;
567
568 if (ZS_IS_INTMODEM(uap)) {
569 if (mctrl & TIOCM_RTS)
570 set_bits |= RTS;
571 else
572 clear_bits |= RTS;
573 }
574 if (mctrl & TIOCM_DTR)
575 set_bits |= DTR;
576 else
577 clear_bits |= DTR;
578
579 /* NOTE: Not subject to 'transmitter active' rule. */
580 uap->curregs[R5] |= set_bits;
581 uap->curregs[R5] &= ~clear_bits;
582
583 write_zsreg(uap, R5, uap->curregs[R5]);
584 pmz_debug("pmz_set_mctrl: set bits: %x, clear bits: %x -> %x\n",
585 set_bits, clear_bits, uap->curregs[R5]);
586 zssync(uap);
587}
588
589/*
590 * Get Modem Control bits (only the input ones, the core will
591 * or that with a cached value of the control ones)
592 * The port lock is held and interrupts are disabled.
593 */
594static unsigned int pmz_get_mctrl(struct uart_port *port)
595{
596 struct uart_pmac_port *uap = to_pmz(port);
597 unsigned char status;
598 unsigned int ret;
599
600 status = read_zsreg(uap, R0);
601
602 ret = 0;
603 if (status & DCD)
604 ret |= TIOCM_CAR;
605 if (status & SYNC_HUNT)
606 ret |= TIOCM_DSR;
607 if (!(status & CTS))
608 ret |= TIOCM_CTS;
609
610 return ret;
611}
612
613/*
614 * Stop TX side. Dealt like sunzilog at next Tx interrupt,
615 * though for DMA, we will have to do a bit more.
616 * The port lock is held and interrupts are disabled.
617 */
618static void pmz_stop_tx(struct uart_port *port)
619{
620 to_pmz(port)->flags |= PMACZILOG_FLAG_TX_STOPPED;
621}
622
623/*
624 * Kick the Tx side.
625 * The port lock is held and interrupts are disabled.
626 */
627static void pmz_start_tx(struct uart_port *port)
628{
629 struct uart_pmac_port *uap = to_pmz(port);
630 unsigned char status;
631
632 pmz_debug("pmz: start_tx()\n");
633
634 uap->flags |= PMACZILOG_FLAG_TX_ACTIVE;
635 uap->flags &= ~PMACZILOG_FLAG_TX_STOPPED;
636
637 status = read_zsreg(uap, R0);
638
639 /* TX busy? Just wait for the TX done interrupt. */
640 if (!(status & Tx_BUF_EMP))
641 return;
642
643 /* Send the first character to jump-start the TX done
644 * IRQ sending engine.
645 */
646 if (port->x_char) {
647 write_zsdata(uap, port->x_char);
648 zssync(uap);
649 port->icount.tx++;
650 port->x_char = 0;
651 } else {
652 struct circ_buf *xmit = &port->state->xmit;
653
654 write_zsdata(uap, xmit->buf[xmit->tail]);
655 zssync(uap);
656 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
657 port->icount.tx++;
658
659 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
660 uart_write_wakeup(&uap->port);
661 }
662 pmz_debug("pmz: start_tx() done.\n");
663}
664
665/*
666 * Stop Rx side, basically disable emitting of
667 * Rx interrupts on the port. We don't disable the rx
668 * side of the chip proper though
669 * The port lock is held.
670 */
671static void pmz_stop_rx(struct uart_port *port)
672{
673 struct uart_pmac_port *uap = to_pmz(port);
674
675 pmz_debug("pmz: stop_rx()()\n");
676
677 /* Disable all RX interrupts. */
678 uap->curregs[R1] &= ~RxINT_MASK;
679 pmz_maybe_update_regs(uap);
680
681 pmz_debug("pmz: stop_rx() done.\n");
682}
683
684/*
685 * Enable modem status change interrupts
686 * The port lock is held.
687 */
688static void pmz_enable_ms(struct uart_port *port)
689{
690 struct uart_pmac_port *uap = to_pmz(port);
691 unsigned char new_reg;
692
693 if (ZS_IS_IRDA(uap))
694 return;
695 new_reg = uap->curregs[R15] | (DCDIE | SYNCIE | CTSIE);
696 if (new_reg != uap->curregs[R15]) {
697 uap->curregs[R15] = new_reg;
698
699 /* NOTE: Not subject to 'transmitter active' rule. */
700 write_zsreg(uap, R15, uap->curregs[R15]);
701 }
702}
703
704/*
705 * Control break state emission
706 * The port lock is not held.
707 */
708static void pmz_break_ctl(struct uart_port *port, int break_state)
709{
710 struct uart_pmac_port *uap = to_pmz(port);
711 unsigned char set_bits, clear_bits, new_reg;
712 unsigned long flags;
713
714 set_bits = clear_bits = 0;
715
716 if (break_state)
717 set_bits |= SND_BRK;
718 else
719 clear_bits |= SND_BRK;
720
721 spin_lock_irqsave(&port->lock, flags);
722
723 new_reg = (uap->curregs[R5] | set_bits) & ~clear_bits;
724 if (new_reg != uap->curregs[R5]) {
725 uap->curregs[R5] = new_reg;
726 write_zsreg(uap, R5, uap->curregs[R5]);
727 }
728
729 spin_unlock_irqrestore(&port->lock, flags);
730}
731
732#ifdef CONFIG_PPC_PMAC
733
734/*
735 * Turn power on or off to the SCC and associated stuff
736 * (port drivers, modem, IR port, etc.)
737 * Returns the number of milliseconds we should wait before
738 * trying to use the port.
739 */
740static int pmz_set_scc_power(struct uart_pmac_port *uap, int state)
741{
742 int delay = 0;
743 int rc;
744
745 if (state) {
746 rc = pmac_call_feature(
747 PMAC_FTR_SCC_ENABLE, uap->node, uap->port_type, 1);
748 pmz_debug("port power on result: %d\n", rc);
749 if (ZS_IS_INTMODEM(uap)) {
750 rc = pmac_call_feature(
751 PMAC_FTR_MODEM_ENABLE, uap->node, 0, 1);
752 delay = 2500; /* wait for 2.5s before using */
753 pmz_debug("modem power result: %d\n", rc);
754 }
755 } else {
756 /* TODO: Make that depend on a timer, don't power down
757 * immediately
758 */
759 if (ZS_IS_INTMODEM(uap)) {
760 rc = pmac_call_feature(
761 PMAC_FTR_MODEM_ENABLE, uap->node, 0, 0);
762 pmz_debug("port power off result: %d\n", rc);
763 }
764 pmac_call_feature(PMAC_FTR_SCC_ENABLE, uap->node, uap->port_type, 0);
765 }
766 return delay;
767}
768
769#else
770
771static int pmz_set_scc_power(struct uart_pmac_port *uap, int state)
772{
773 return 0;
774}
775
776#endif /* !CONFIG_PPC_PMAC */
777
778/*
779 * FixZeroBug....Works around a bug in the SCC receiving channel.
780 * Inspired from Darwin code, 15 Sept. 2000 -DanM
781 *
782 * The following sequence prevents a problem that is seen with O'Hare ASICs
783 * (most versions -- also with some Heathrow and Hydra ASICs) where a zero
784 * at the input to the receiver becomes 'stuck' and locks up the receiver.
785 * This problem can occur as a result of a zero bit at the receiver input
786 * coincident with any of the following events:
787 *
788 * The SCC is initialized (hardware or software).
789 * A framing error is detected.
790 * The clocking option changes from synchronous or X1 asynchronous
791 * clocking to X16, X32, or X64 asynchronous clocking.
792 * The decoding mode is changed among NRZ, NRZI, FM0, or FM1.
793 *
794 * This workaround attempts to recover from the lockup condition by placing
795 * the SCC in synchronous loopback mode with a fast clock before programming
796 * any of the asynchronous modes.
797 */
798static void pmz_fix_zero_bug_scc(struct uart_pmac_port *uap)
799{
800 write_zsreg(uap, 9, ZS_IS_CHANNEL_A(uap) ? CHRA : CHRB);
801 zssync(uap);
802 udelay(10);
803 write_zsreg(uap, 9, (ZS_IS_CHANNEL_A(uap) ? CHRA : CHRB) | NV);
804 zssync(uap);
805
806 write_zsreg(uap, 4, X1CLK | MONSYNC);
807 write_zsreg(uap, 3, Rx8);
808 write_zsreg(uap, 5, Tx8 | RTS);
809 write_zsreg(uap, 9, NV); /* Didn't we already do this? */
810 write_zsreg(uap, 11, RCBR | TCBR);
811 write_zsreg(uap, 12, 0);
812 write_zsreg(uap, 13, 0);
813 write_zsreg(uap, 14, (LOOPBAK | BRSRC));
814 write_zsreg(uap, 14, (LOOPBAK | BRSRC | BRENAB));
815 write_zsreg(uap, 3, Rx8 | RxENABLE);
816 write_zsreg(uap, 0, RES_EXT_INT);
817 write_zsreg(uap, 0, RES_EXT_INT);
818 write_zsreg(uap, 0, RES_EXT_INT); /* to kill some time */
819
820 /* The channel should be OK now, but it is probably receiving
821 * loopback garbage.
822 * Switch to asynchronous mode, disable the receiver,
823 * and discard everything in the receive buffer.
824 */
825 write_zsreg(uap, 9, NV);
826 write_zsreg(uap, 4, X16CLK | SB_MASK);
827 write_zsreg(uap, 3, Rx8);
828
829 while (read_zsreg(uap, 0) & Rx_CH_AV) {
830 (void)read_zsreg(uap, 8);
831 write_zsreg(uap, 0, RES_EXT_INT);
832 write_zsreg(uap, 0, ERR_RES);
833 }
834}
835
836/*
837 * Real startup routine, powers up the hardware and sets up
838 * the SCC. Returns a delay in ms where you need to wait before
839 * actually using the port, this is typically the internal modem
840 * powerup delay. This routine expect the lock to be taken.
841 */
842static int __pmz_startup(struct uart_pmac_port *uap)
843{
844 int pwr_delay = 0;
845
846 memset(&uap->curregs, 0, sizeof(uap->curregs));
847
848 /* Power up the SCC & underlying hardware (modem/irda) */
849 pwr_delay = pmz_set_scc_power(uap, 1);
850
851 /* Nice buggy HW ... */
852 pmz_fix_zero_bug_scc(uap);
853
854 /* Reset the channel */
855 uap->curregs[R9] = 0;
856 write_zsreg(uap, 9, ZS_IS_CHANNEL_A(uap) ? CHRA : CHRB);
857 zssync(uap);
858 udelay(10);
859 write_zsreg(uap, 9, 0);
860 zssync(uap);
861
862 /* Clear the interrupt registers */
863 write_zsreg(uap, R1, 0);
864 write_zsreg(uap, R0, ERR_RES);
865 write_zsreg(uap, R0, ERR_RES);
866 write_zsreg(uap, R0, RES_H_IUS);
867 write_zsreg(uap, R0, RES_H_IUS);
868
869 /* Setup some valid baud rate */
870 uap->curregs[R4] = X16CLK | SB1;
871 uap->curregs[R3] = Rx8;
872 uap->curregs[R5] = Tx8 | RTS;
873 if (!ZS_IS_IRDA(uap))
874 uap->curregs[R5] |= DTR;
875 uap->curregs[R12] = 0;
876 uap->curregs[R13] = 0;
877 uap->curregs[R14] = BRENAB;
878
879 /* Clear handshaking, enable BREAK interrupts */
880 uap->curregs[R15] = BRKIE;
881
882 /* Master interrupt enable */
883 uap->curregs[R9] |= NV | MIE;
884
885 pmz_load_zsregs(uap, uap->curregs);
886
887 /* Enable receiver and transmitter. */
888 write_zsreg(uap, R3, uap->curregs[R3] |= RxENABLE);
889 write_zsreg(uap, R5, uap->curregs[R5] |= TxENABLE);
890
891 /* Remember status for DCD/CTS changes */
892 uap->prev_status = read_zsreg(uap, R0);
893
894 return pwr_delay;
895}
896
897static void pmz_irda_reset(struct uart_pmac_port *uap)
898{
899 unsigned long flags;
900
901 spin_lock_irqsave(&uap->port.lock, flags);
902 uap->curregs[R5] |= DTR;
903 write_zsreg(uap, R5, uap->curregs[R5]);
904 zssync(uap);
905 spin_unlock_irqrestore(&uap->port.lock, flags);
906 msleep(110);
907
908 spin_lock_irqsave(&uap->port.lock, flags);
909 uap->curregs[R5] &= ~DTR;
910 write_zsreg(uap, R5, uap->curregs[R5]);
911 zssync(uap);
912 spin_unlock_irqrestore(&uap->port.lock, flags);
913 msleep(10);
914}
915
916/*
917 * This is the "normal" startup routine, using the above one
918 * wrapped with the lock and doing a schedule delay
919 */
920static int pmz_startup(struct uart_port *port)
921{
922 struct uart_pmac_port *uap = to_pmz(port);
923 unsigned long flags;
924 int pwr_delay = 0;
925
926 pmz_debug("pmz: startup()\n");
927
928 uap->flags |= PMACZILOG_FLAG_IS_OPEN;
929
930 /* A console is never powered down. Else, power up and
931 * initialize the chip
932 */
933 if (!ZS_IS_CONS(uap)) {
934 spin_lock_irqsave(&port->lock, flags);
935 pwr_delay = __pmz_startup(uap);
936 spin_unlock_irqrestore(&port->lock, flags);
937 }
938 sprintf(uap->irq_name, PMACZILOG_NAME"%d", uap->port.line);
939 if (request_irq(uap->port.irq, pmz_interrupt, IRQF_SHARED,
940 uap->irq_name, uap)) {
941 pmz_error("Unable to register zs interrupt handler.\n");
942 pmz_set_scc_power(uap, 0);
943 return -ENXIO;
944 }
945
946 /* Right now, we deal with delay by blocking here, I'll be
947 * smarter later on
948 */
949 if (pwr_delay != 0) {
950 pmz_debug("pmz: delaying %d ms\n", pwr_delay);
951 msleep(pwr_delay);
952 }
953
954 /* IrDA reset is done now */
955 if (ZS_IS_IRDA(uap))
956 pmz_irda_reset(uap);
957
958 /* Enable interrupt requests for the channel */
959 spin_lock_irqsave(&port->lock, flags);
960 pmz_interrupt_control(uap, 1);
961 spin_unlock_irqrestore(&port->lock, flags);
962
963 pmz_debug("pmz: startup() done.\n");
964
965 return 0;
966}
967
968static void pmz_shutdown(struct uart_port *port)
969{
970 struct uart_pmac_port *uap = to_pmz(port);
971 unsigned long flags;
972
973 pmz_debug("pmz: shutdown()\n");
974
975 spin_lock_irqsave(&port->lock, flags);
976
977 /* Disable interrupt requests for the channel */
978 pmz_interrupt_control(uap, 0);
979
980 if (!ZS_IS_CONS(uap)) {
981 /* Disable receiver and transmitter */
982 uap->curregs[R3] &= ~RxENABLE;
983 uap->curregs[R5] &= ~TxENABLE;
984
985 /* Disable break assertion */
986 uap->curregs[R5] &= ~SND_BRK;
987 pmz_maybe_update_regs(uap);
988 }
989
990 spin_unlock_irqrestore(&port->lock, flags);
991
992 /* Release interrupt handler */
993 free_irq(uap->port.irq, uap);
994
995 spin_lock_irqsave(&port->lock, flags);
996
997 uap->flags &= ~PMACZILOG_FLAG_IS_OPEN;
998
999 if (!ZS_IS_CONS(uap))
1000 pmz_set_scc_power(uap, 0); /* Shut the chip down */
1001
1002 spin_unlock_irqrestore(&port->lock, flags);
1003
1004 pmz_debug("pmz: shutdown() done.\n");
1005}
1006
1007/* Shared by TTY driver and serial console setup. The port lock is held
1008 * and local interrupts are disabled.
1009 */
1010static void pmz_convert_to_zs(struct uart_pmac_port *uap, unsigned int cflag,
1011 unsigned int iflag, unsigned long baud)
1012{
1013 int brg;
1014
1015 /* Switch to external clocking for IrDA high clock rates. That
1016 * code could be re-used for Midi interfaces with different
1017 * multipliers
1018 */
1019 if (baud >= 115200 && ZS_IS_IRDA(uap)) {
1020 uap->curregs[R4] = X1CLK;
1021 uap->curregs[R11] = RCTRxCP | TCTRxCP;
1022 uap->curregs[R14] = 0; /* BRG off */
1023 uap->curregs[R12] = 0;
1024 uap->curregs[R13] = 0;
1025 uap->flags |= PMACZILOG_FLAG_IS_EXTCLK;
1026 } else {
1027 switch (baud) {
1028 case ZS_CLOCK/16: /* 230400 */
1029 uap->curregs[R4] = X16CLK;
1030 uap->curregs[R11] = 0;
1031 uap->curregs[R14] = 0;
1032 break;
1033 case ZS_CLOCK/32: /* 115200 */
1034 uap->curregs[R4] = X32CLK;
1035 uap->curregs[R11] = 0;
1036 uap->curregs[R14] = 0;
1037 break;
1038 default:
1039 uap->curregs[R4] = X16CLK;
1040 uap->curregs[R11] = TCBR | RCBR;
1041 brg = BPS_TO_BRG(baud, ZS_CLOCK / 16);
1042 uap->curregs[R12] = (brg & 255);
1043 uap->curregs[R13] = ((brg >> 8) & 255);
1044 uap->curregs[R14] = BRENAB;
1045 }
1046 uap->flags &= ~PMACZILOG_FLAG_IS_EXTCLK;
1047 }
1048
1049 /* Character size, stop bits, and parity. */
1050 uap->curregs[3] &= ~RxN_MASK;
1051 uap->curregs[5] &= ~TxN_MASK;
1052
1053 switch (cflag & CSIZE) {
1054 case CS5:
1055 uap->curregs[3] |= Rx5;
1056 uap->curregs[5] |= Tx5;
1057 uap->parity_mask = 0x1f;
1058 break;
1059 case CS6:
1060 uap->curregs[3] |= Rx6;
1061 uap->curregs[5] |= Tx6;
1062 uap->parity_mask = 0x3f;
1063 break;
1064 case CS7:
1065 uap->curregs[3] |= Rx7;
1066 uap->curregs[5] |= Tx7;
1067 uap->parity_mask = 0x7f;
1068 break;
1069 case CS8:
1070 default:
1071 uap->curregs[3] |= Rx8;
1072 uap->curregs[5] |= Tx8;
1073 uap->parity_mask = 0xff;
1074 break;
1075 };
1076 uap->curregs[4] &= ~(SB_MASK);
1077 if (cflag & CSTOPB)
1078 uap->curregs[4] |= SB2;
1079 else
1080 uap->curregs[4] |= SB1;
1081 if (cflag & PARENB)
1082 uap->curregs[4] |= PAR_ENAB;
1083 else
1084 uap->curregs[4] &= ~PAR_ENAB;
1085 if (!(cflag & PARODD))
1086 uap->curregs[4] |= PAR_EVEN;
1087 else
1088 uap->curregs[4] &= ~PAR_EVEN;
1089
1090 uap->port.read_status_mask = Rx_OVR;
1091 if (iflag & INPCK)
1092 uap->port.read_status_mask |= CRC_ERR | PAR_ERR;
1093 if (iflag & (BRKINT | PARMRK))
1094 uap->port.read_status_mask |= BRK_ABRT;
1095
1096 uap->port.ignore_status_mask = 0;
1097 if (iflag & IGNPAR)
1098 uap->port.ignore_status_mask |= CRC_ERR | PAR_ERR;
1099 if (iflag & IGNBRK) {
1100 uap->port.ignore_status_mask |= BRK_ABRT;
1101 if (iflag & IGNPAR)
1102 uap->port.ignore_status_mask |= Rx_OVR;
1103 }
1104
1105 if ((cflag & CREAD) == 0)
1106 uap->port.ignore_status_mask = 0xff;
1107}
1108
1109
1110/*
1111 * Set the irda codec on the imac to the specified baud rate.
1112 */
1113static void pmz_irda_setup(struct uart_pmac_port *uap, unsigned long *baud)
1114{
1115 u8 cmdbyte;
1116 int t, version;
1117
1118 switch (*baud) {
1119 /* SIR modes */
1120 case 2400:
1121 cmdbyte = 0x53;
1122 break;
1123 case 4800:
1124 cmdbyte = 0x52;
1125 break;
1126 case 9600:
1127 cmdbyte = 0x51;
1128 break;
1129 case 19200:
1130 cmdbyte = 0x50;
1131 break;
1132 case 38400:
1133 cmdbyte = 0x4f;
1134 break;
1135 case 57600:
1136 cmdbyte = 0x4e;
1137 break;
1138 case 115200:
1139 cmdbyte = 0x4d;
1140 break;
1141 /* The FIR modes aren't really supported at this point, how
1142 * do we select the speed ? via the FCR on KeyLargo ?
1143 */
1144 case 1152000:
1145 cmdbyte = 0;
1146 break;
1147 case 4000000:
1148 cmdbyte = 0;
1149 break;
1150 default: /* 9600 */
1151 cmdbyte = 0x51;
1152 *baud = 9600;
1153 break;
1154 }
1155
1156 /* Wait for transmitter to drain */
1157 t = 10000;
1158 while ((read_zsreg(uap, R0) & Tx_BUF_EMP) == 0
1159 || (read_zsreg(uap, R1) & ALL_SNT) == 0) {
1160 if (--t <= 0) {
1161 pmz_error("transmitter didn't drain\n");
1162 return;
1163 }
1164 udelay(10);
1165 }
1166
1167 /* Drain the receiver too */
1168 t = 100;
1169 (void)read_zsdata(uap);
1170 (void)read_zsdata(uap);
1171 (void)read_zsdata(uap);
1172 mdelay(10);
1173 while (read_zsreg(uap, R0) & Rx_CH_AV) {
1174 read_zsdata(uap);
1175 mdelay(10);
1176 if (--t <= 0) {
1177 pmz_error("receiver didn't drain\n");
1178 return;
1179 }
1180 }
1181
1182 /* Switch to command mode */
1183 uap->curregs[R5] |= DTR;
1184 write_zsreg(uap, R5, uap->curregs[R5]);
1185 zssync(uap);
1186 mdelay(1);
1187
1188 /* Switch SCC to 19200 */
1189 pmz_convert_to_zs(uap, CS8, 0, 19200);
1190 pmz_load_zsregs(uap, uap->curregs);
1191 mdelay(1);
1192
1193 /* Write get_version command byte */
1194 write_zsdata(uap, 1);
1195 t = 5000;
1196 while ((read_zsreg(uap, R0) & Rx_CH_AV) == 0) {
1197 if (--t <= 0) {
1198 pmz_error("irda_setup timed out on get_version byte\n");
1199 goto out;
1200 }
1201 udelay(10);
1202 }
1203 version = read_zsdata(uap);
1204
1205 if (version < 4) {
1206 pmz_info("IrDA: dongle version %d not supported\n", version);
1207 goto out;
1208 }
1209
1210 /* Send speed mode */
1211 write_zsdata(uap, cmdbyte);
1212 t = 5000;
1213 while ((read_zsreg(uap, R0) & Rx_CH_AV) == 0) {
1214 if (--t <= 0) {
1215 pmz_error("irda_setup timed out on speed mode byte\n");
1216 goto out;
1217 }
1218 udelay(10);
1219 }
1220 t = read_zsdata(uap);
1221 if (t != cmdbyte)
1222 pmz_error("irda_setup speed mode byte = %x (%x)\n", t, cmdbyte);
1223
1224 pmz_info("IrDA setup for %ld bps, dongle version: %d\n",
1225 *baud, version);
1226
1227 (void)read_zsdata(uap);
1228 (void)read_zsdata(uap);
1229 (void)read_zsdata(uap);
1230
1231 out:
1232 /* Switch back to data mode */
1233 uap->curregs[R5] &= ~DTR;
1234 write_zsreg(uap, R5, uap->curregs[R5]);
1235 zssync(uap);
1236
1237 (void)read_zsdata(uap);
1238 (void)read_zsdata(uap);
1239 (void)read_zsdata(uap);
1240}
1241
1242
1243static void __pmz_set_termios(struct uart_port *port, struct ktermios *termios,
1244 struct ktermios *old)
1245{
1246 struct uart_pmac_port *uap = to_pmz(port);
1247 unsigned long baud;
1248
1249 pmz_debug("pmz: set_termios()\n");
1250
1251 memcpy(&uap->termios_cache, termios, sizeof(struct ktermios));
1252
1253 /* XXX Check which revs of machines actually allow 1 and 4Mb speeds
1254 * on the IR dongle. Note that the IRTTY driver currently doesn't know
1255 * about the FIR mode and high speed modes. So these are unused. For
1256 * implementing proper support for these, we should probably add some
1257 * DMA as well, at least on the Rx side, which isn't a simple thing
1258 * at this point.
1259 */
1260 if (ZS_IS_IRDA(uap)) {
1261 /* Calc baud rate */
1262 baud = uart_get_baud_rate(port, termios, old, 1200, 4000000);
1263 pmz_debug("pmz: switch IRDA to %ld bauds\n", baud);
1264 /* Cet the irda codec to the right rate */
1265 pmz_irda_setup(uap, &baud);
1266 /* Set final baud rate */
1267 pmz_convert_to_zs(uap, termios->c_cflag, termios->c_iflag, baud);
1268 pmz_load_zsregs(uap, uap->curregs);
1269 zssync(uap);
1270 } else {
1271 baud = uart_get_baud_rate(port, termios, old, 1200, 230400);
1272 pmz_convert_to_zs(uap, termios->c_cflag, termios->c_iflag, baud);
1273 /* Make sure modem status interrupts are correctly configured */
1274 if (UART_ENABLE_MS(&uap->port, termios->c_cflag)) {
1275 uap->curregs[R15] |= DCDIE | SYNCIE | CTSIE;
1276 uap->flags |= PMACZILOG_FLAG_MODEM_STATUS;
1277 } else {
1278 uap->curregs[R15] &= ~(DCDIE | SYNCIE | CTSIE);
1279 uap->flags &= ~PMACZILOG_FLAG_MODEM_STATUS;
1280 }
1281
1282 /* Load registers to the chip */
1283 pmz_maybe_update_regs(uap);
1284 }
1285 uart_update_timeout(port, termios->c_cflag, baud);
1286
1287 pmz_debug("pmz: set_termios() done.\n");
1288}
1289
1290/* The port lock is not held. */
1291static void pmz_set_termios(struct uart_port *port, struct ktermios *termios,
1292 struct ktermios *old)
1293{
1294 struct uart_pmac_port *uap = to_pmz(port);
1295 unsigned long flags;
1296
1297 spin_lock_irqsave(&port->lock, flags);
1298
1299 /* Disable IRQs on the port */
1300 pmz_interrupt_control(uap, 0);
1301
1302 /* Setup new port configuration */
1303 __pmz_set_termios(port, termios, old);
1304
1305 /* Re-enable IRQs on the port */
1306 if (ZS_IS_OPEN(uap))
1307 pmz_interrupt_control(uap, 1);
1308
1309 spin_unlock_irqrestore(&port->lock, flags);
1310}
1311
1312static const char *pmz_type(struct uart_port *port)
1313{
1314 struct uart_pmac_port *uap = to_pmz(port);
1315
1316 if (ZS_IS_IRDA(uap))
1317 return "Z85c30 ESCC - Infrared port";
1318 else if (ZS_IS_INTMODEM(uap))
1319 return "Z85c30 ESCC - Internal modem";
1320 return "Z85c30 ESCC - Serial port";
1321}
1322
1323/* We do not request/release mappings of the registers here, this
1324 * happens at early serial probe time.
1325 */
1326static void pmz_release_port(struct uart_port *port)
1327{
1328}
1329
1330static int pmz_request_port(struct uart_port *port)
1331{
1332 return 0;
1333}
1334
1335/* These do not need to do anything interesting either. */
1336static void pmz_config_port(struct uart_port *port, int flags)
1337{
1338}
1339
1340/* We do not support letting the user mess with the divisor, IRQ, etc. */
1341static int pmz_verify_port(struct uart_port *port, struct serial_struct *ser)
1342{
1343 return -EINVAL;
1344}
1345
1346#ifdef CONFIG_CONSOLE_POLL
1347
1348static int pmz_poll_get_char(struct uart_port *port)
1349{
1350 struct uart_pmac_port *uap = (struct uart_pmac_port *)port;
1351 int tries = 2;
1352
1353 while (tries) {
1354 if ((read_zsreg(uap, R0) & Rx_CH_AV) != 0)
1355 return read_zsdata(uap);
1356 if (tries--)
1357 udelay(5);
1358 }
1359
1360 return NO_POLL_CHAR;
1361}
1362
1363static void pmz_poll_put_char(struct uart_port *port, unsigned char c)
1364{
1365 struct uart_pmac_port *uap = (struct uart_pmac_port *)port;
1366
1367 /* Wait for the transmit buffer to empty. */
1368 while ((read_zsreg(uap, R0) & Tx_BUF_EMP) == 0)
1369 udelay(5);
1370 write_zsdata(uap, c);
1371}
1372
1373#endif /* CONFIG_CONSOLE_POLL */
1374
1375static struct uart_ops pmz_pops = {
1376 .tx_empty = pmz_tx_empty,
1377 .set_mctrl = pmz_set_mctrl,
1378 .get_mctrl = pmz_get_mctrl,
1379 .stop_tx = pmz_stop_tx,
1380 .start_tx = pmz_start_tx,
1381 .stop_rx = pmz_stop_rx,
1382 .enable_ms = pmz_enable_ms,
1383 .break_ctl = pmz_break_ctl,
1384 .startup = pmz_startup,
1385 .shutdown = pmz_shutdown,
1386 .set_termios = pmz_set_termios,
1387 .type = pmz_type,
1388 .release_port = pmz_release_port,
1389 .request_port = pmz_request_port,
1390 .config_port = pmz_config_port,
1391 .verify_port = pmz_verify_port,
1392#ifdef CONFIG_CONSOLE_POLL
1393 .poll_get_char = pmz_poll_get_char,
1394 .poll_put_char = pmz_poll_put_char,
1395#endif
1396};
1397
1398#ifdef CONFIG_PPC_PMAC
1399
1400/*
1401 * Setup one port structure after probing, HW is down at this point,
1402 * Unlike sunzilog, we don't need to pre-init the spinlock as we don't
1403 * register our console before uart_add_one_port() is called
1404 */
1405static int __init pmz_init_port(struct uart_pmac_port *uap)
1406{
1407 struct device_node *np = uap->node;
1408 const char *conn;
1409 const struct slot_names_prop {
1410 int count;
1411 char name[1];
1412 } *slots;
1413 int len;
1414 struct resource r_ports, r_rxdma, r_txdma;
1415
1416 /*
1417 * Request & map chip registers
1418 */
1419 if (of_address_to_resource(np, 0, &r_ports))
1420 return -ENODEV;
1421 uap->port.mapbase = r_ports.start;
1422 uap->port.membase = ioremap(uap->port.mapbase, 0x1000);
1423
1424 uap->control_reg = uap->port.membase;
1425 uap->data_reg = uap->control_reg + 0x10;
1426
1427 /*
1428 * Request & map DBDMA registers
1429 */
1430#ifdef HAS_DBDMA
1431 if (of_address_to_resource(np, 1, &r_txdma) == 0 &&
1432 of_address_to_resource(np, 2, &r_rxdma) == 0)
1433 uap->flags |= PMACZILOG_FLAG_HAS_DMA;
1434#else
1435 memset(&r_txdma, 0, sizeof(struct resource));
1436 memset(&r_rxdma, 0, sizeof(struct resource));
1437#endif
1438 if (ZS_HAS_DMA(uap)) {
1439 uap->tx_dma_regs = ioremap(r_txdma.start, 0x100);
1440 if (uap->tx_dma_regs == NULL) {
1441 uap->flags &= ~PMACZILOG_FLAG_HAS_DMA;
1442 goto no_dma;
1443 }
1444 uap->rx_dma_regs = ioremap(r_rxdma.start, 0x100);
1445 if (uap->rx_dma_regs == NULL) {
1446 iounmap(uap->tx_dma_regs);
1447 uap->tx_dma_regs = NULL;
1448 uap->flags &= ~PMACZILOG_FLAG_HAS_DMA;
1449 goto no_dma;
1450 }
1451 uap->tx_dma_irq = irq_of_parse_and_map(np, 1);
1452 uap->rx_dma_irq = irq_of_parse_and_map(np, 2);
1453 }
1454no_dma:
1455
1456 /*
1457 * Detect port type
1458 */
1459 if (of_device_is_compatible(np, "cobalt"))
1460 uap->flags |= PMACZILOG_FLAG_IS_INTMODEM;
1461 conn = of_get_property(np, "AAPL,connector", &len);
1462 if (conn && (strcmp(conn, "infrared") == 0))
1463 uap->flags |= PMACZILOG_FLAG_IS_IRDA;
1464 uap->port_type = PMAC_SCC_ASYNC;
1465 /* 1999 Powerbook G3 has slot-names property instead */
1466 slots = of_get_property(np, "slot-names", &len);
1467 if (slots && slots->count > 0) {
1468 if (strcmp(slots->name, "IrDA") == 0)
1469 uap->flags |= PMACZILOG_FLAG_IS_IRDA;
1470 else if (strcmp(slots->name, "Modem") == 0)
1471 uap->flags |= PMACZILOG_FLAG_IS_INTMODEM;
1472 }
1473 if (ZS_IS_IRDA(uap))
1474 uap->port_type = PMAC_SCC_IRDA;
1475 if (ZS_IS_INTMODEM(uap)) {
1476 struct device_node* i2c_modem =
1477 of_find_node_by_name(NULL, "i2c-modem");
1478 if (i2c_modem) {
1479 const char* mid =
1480 of_get_property(i2c_modem, "modem-id", NULL);
1481 if (mid) switch(*mid) {
1482 case 0x04 :
1483 case 0x05 :
1484 case 0x07 :
1485 case 0x08 :
1486 case 0x0b :
1487 case 0x0c :
1488 uap->port_type = PMAC_SCC_I2S1;
1489 }
1490 printk(KERN_INFO "pmac_zilog: i2c-modem detected, id: %d\n",
1491 mid ? (*mid) : 0);
1492 of_node_put(i2c_modem);
1493 } else {
1494 printk(KERN_INFO "pmac_zilog: serial modem detected\n");
1495 }
1496 }
1497
1498 /*
1499 * Init remaining bits of "port" structure
1500 */
1501 uap->port.iotype = UPIO_MEM;
1502 uap->port.irq = irq_of_parse_and_map(np, 0);
1503 uap->port.uartclk = ZS_CLOCK;
1504 uap->port.fifosize = 1;
1505 uap->port.ops = &pmz_pops;
1506 uap->port.type = PORT_PMAC_ZILOG;
1507 uap->port.flags = 0;
1508
1509 /*
1510 * Fixup for the port on Gatwick for which the device-tree has
1511 * missing interrupts. Normally, the macio_dev would contain
1512 * fixed up interrupt info, but we use the device-tree directly
1513 * here due to early probing so we need the fixup too.
1514 */
1515 if (uap->port.irq == 0 &&
1516 np->parent && np->parent->parent &&
1517 of_device_is_compatible(np->parent->parent, "gatwick")) {
1518 /* IRQs on gatwick are offset by 64 */
1519 uap->port.irq = irq_create_mapping(NULL, 64 + 15);
1520 uap->tx_dma_irq = irq_create_mapping(NULL, 64 + 4);
1521 uap->rx_dma_irq = irq_create_mapping(NULL, 64 + 5);
1522 }
1523
1524 /* Setup some valid baud rate information in the register
1525 * shadows so we don't write crap there before baud rate is
1526 * first initialized.
1527 */
1528 pmz_convert_to_zs(uap, CS8, 0, 9600);
1529
1530 return 0;
1531}
1532
1533/*
1534 * Get rid of a port on module removal
1535 */
1536static void pmz_dispose_port(struct uart_pmac_port *uap)
1537{
1538 struct device_node *np;
1539
1540 np = uap->node;
1541 iounmap(uap->rx_dma_regs);
1542 iounmap(uap->tx_dma_regs);
1543 iounmap(uap->control_reg);
1544 uap->node = NULL;
1545 of_node_put(np);
1546 memset(uap, 0, sizeof(struct uart_pmac_port));
1547}
1548
1549/*
1550 * Called upon match with an escc node in the device-tree.
1551 */
1552static int pmz_attach(struct macio_dev *mdev, const struct of_device_id *match)
1553{
1554 struct uart_pmac_port *uap;
1555 int i;
1556
1557 /* Iterate the pmz_ports array to find a matching entry
1558 */
1559 for (i = 0; i < MAX_ZS_PORTS; i++)
1560 if (pmz_ports[i].node == mdev->ofdev.dev.of_node)
1561 break;
1562 if (i >= MAX_ZS_PORTS)
1563 return -ENODEV;
1564
1565
1566 uap = &pmz_ports[i];
1567 uap->dev = mdev;
1568 uap->port.dev = &mdev->ofdev.dev;
1569 dev_set_drvdata(&mdev->ofdev.dev, uap);
1570
1571 /* We still activate the port even when failing to request resources
1572 * to work around bugs in ancient Apple device-trees
1573 */
1574 if (macio_request_resources(uap->dev, "pmac_zilog"))
1575 printk(KERN_WARNING "%s: Failed to request resource"
1576 ", port still active\n",
1577 uap->node->name);
1578 else
1579 uap->flags |= PMACZILOG_FLAG_RSRC_REQUESTED;
1580
1581 return uart_add_one_port(&pmz_uart_reg, &uap->port);
1582}
1583
1584/*
1585 * That one should not be called, macio isn't really a hotswap device,
1586 * we don't expect one of those serial ports to go away...
1587 */
1588static int pmz_detach(struct macio_dev *mdev)
1589{
1590 struct uart_pmac_port *uap = dev_get_drvdata(&mdev->ofdev.dev);
1591
1592 if (!uap)
1593 return -ENODEV;
1594
1595 uart_remove_one_port(&pmz_uart_reg, &uap->port);
1596
1597 if (uap->flags & PMACZILOG_FLAG_RSRC_REQUESTED) {
1598 macio_release_resources(uap->dev);
1599 uap->flags &= ~PMACZILOG_FLAG_RSRC_REQUESTED;
1600 }
1601 dev_set_drvdata(&mdev->ofdev.dev, NULL);
1602 uap->dev = NULL;
1603 uap->port.dev = NULL;
1604
1605 return 0;
1606}
1607
1608
1609static int pmz_suspend(struct macio_dev *mdev, pm_message_t pm_state)
1610{
1611 struct uart_pmac_port *uap = dev_get_drvdata(&mdev->ofdev.dev);
1612
1613 if (uap == NULL) {
1614 printk("HRM... pmz_suspend with NULL uap\n");
1615 return 0;
1616 }
1617
1618 uart_suspend_port(&pmz_uart_reg, &uap->port);
1619
1620 return 0;
1621}
1622
1623
1624static int pmz_resume(struct macio_dev *mdev)
1625{
1626 struct uart_pmac_port *uap = dev_get_drvdata(&mdev->ofdev.dev);
1627
1628 if (uap == NULL)
1629 return 0;
1630
1631 uart_resume_port(&pmz_uart_reg, &uap->port);
1632
1633 return 0;
1634}
1635
1636/*
1637 * Probe all ports in the system and build the ports array, we register
1638 * with the serial layer later, so we get a proper struct device which
1639 * allows the tty to attach properly. This is later than it used to be
1640 * but the tty layer really wants it that way.
1641 */
1642static int __init pmz_probe(void)
1643{
1644 struct device_node *node_p, *node_a, *node_b, *np;
1645 int count = 0;
1646 int rc;
1647
1648 /*
1649 * Find all escc chips in the system
1650 */
1651 node_p = of_find_node_by_name(NULL, "escc");
1652 while (node_p) {
1653 /*
1654 * First get channel A/B node pointers
1655 *
1656 * TODO: Add routines with proper locking to do that...
1657 */
1658 node_a = node_b = NULL;
1659 for (np = NULL; (np = of_get_next_child(node_p, np)) != NULL;) {
1660 if (strncmp(np->name, "ch-a", 4) == 0)
1661 node_a = of_node_get(np);
1662 else if (strncmp(np->name, "ch-b", 4) == 0)
1663 node_b = of_node_get(np);
1664 }
1665 if (!node_a && !node_b) {
1666 of_node_put(node_a);
1667 of_node_put(node_b);
1668 printk(KERN_ERR "pmac_zilog: missing node %c for escc %s\n",
1669 (!node_a) ? 'a' : 'b', node_p->full_name);
1670 goto next;
1671 }
1672
1673 /*
1674 * Fill basic fields in the port structures
1675 */
1676 if (node_b != NULL) {
1677 pmz_ports[count].mate = &pmz_ports[count+1];
1678 pmz_ports[count+1].mate = &pmz_ports[count];
1679 }
1680 pmz_ports[count].flags = PMACZILOG_FLAG_IS_CHANNEL_A;
1681 pmz_ports[count].node = node_a;
1682 pmz_ports[count+1].node = node_b;
1683 pmz_ports[count].port.line = count;
1684 pmz_ports[count+1].port.line = count+1;
1685
1686 /*
1687 * Setup the ports for real
1688 */
1689 rc = pmz_init_port(&pmz_ports[count]);
1690 if (rc == 0 && node_b != NULL)
1691 rc = pmz_init_port(&pmz_ports[count+1]);
1692 if (rc != 0) {
1693 of_node_put(node_a);
1694 of_node_put(node_b);
1695 memset(&pmz_ports[count], 0, sizeof(struct uart_pmac_port));
1696 memset(&pmz_ports[count+1], 0, sizeof(struct uart_pmac_port));
1697 goto next;
1698 }
1699 count += 2;
1700next:
1701 node_p = of_find_node_by_name(node_p, "escc");
1702 }
1703 pmz_ports_count = count;
1704
1705 return 0;
1706}
1707
1708#else
1709
1710extern struct platform_device scc_a_pdev, scc_b_pdev;
1711
1712static int __init pmz_init_port(struct uart_pmac_port *uap)
1713{
1714 struct resource *r_ports;
1715 int irq;
1716
1717 r_ports = platform_get_resource(uap->pdev, IORESOURCE_MEM, 0);
1718 irq = platform_get_irq(uap->pdev, 0);
1719 if (!r_ports || !irq)
1720 return -ENODEV;
1721
1722 uap->port.mapbase = r_ports->start;
1723 uap->port.membase = (unsigned char __iomem *) r_ports->start;
1724 uap->port.iotype = UPIO_MEM;
1725 uap->port.irq = irq;
1726 uap->port.uartclk = ZS_CLOCK;
1727 uap->port.fifosize = 1;
1728 uap->port.ops = &pmz_pops;
1729 uap->port.type = PORT_PMAC_ZILOG;
1730 uap->port.flags = 0;
1731
1732 uap->control_reg = uap->port.membase;
1733 uap->data_reg = uap->control_reg + 4;
1734 uap->port_type = 0;
1735
1736 pmz_convert_to_zs(uap, CS8, 0, 9600);
1737
1738 return 0;
1739}
1740
1741static int __init pmz_probe(void)
1742{
1743 int err;
1744
1745 pmz_ports_count = 0;
1746
1747 pmz_ports[0].port.line = 0;
1748 pmz_ports[0].flags = PMACZILOG_FLAG_IS_CHANNEL_A;
1749 pmz_ports[0].pdev = &scc_a_pdev;
1750 err = pmz_init_port(&pmz_ports[0]);
1751 if (err)
1752 return err;
1753 pmz_ports_count++;
1754
1755 pmz_ports[0].mate = &pmz_ports[1];
1756 pmz_ports[1].mate = &pmz_ports[0];
1757 pmz_ports[1].port.line = 1;
1758 pmz_ports[1].flags = 0;
1759 pmz_ports[1].pdev = &scc_b_pdev;
1760 err = pmz_init_port(&pmz_ports[1]);
1761 if (err)
1762 return err;
1763 pmz_ports_count++;
1764
1765 return 0;
1766}
1767
1768static void pmz_dispose_port(struct uart_pmac_port *uap)
1769{
1770 memset(uap, 0, sizeof(struct uart_pmac_port));
1771}
1772
1773static int __init pmz_attach(struct platform_device *pdev)
1774{
1775 struct uart_pmac_port *uap;
1776 int i;
1777
1778 /* Iterate the pmz_ports array to find a matching entry */
1779 for (i = 0; i < pmz_ports_count; i++)
1780 if (pmz_ports[i].pdev == pdev)
1781 break;
1782 if (i >= pmz_ports_count)
1783 return -ENODEV;
1784
1785 uap = &pmz_ports[i];
1786 uap->port.dev = &pdev->dev;
1787 platform_set_drvdata(pdev, uap);
1788
1789 return uart_add_one_port(&pmz_uart_reg, &uap->port);
1790}
1791
1792static int __exit pmz_detach(struct platform_device *pdev)
1793{
1794 struct uart_pmac_port *uap = platform_get_drvdata(pdev);
1795
1796 if (!uap)
1797 return -ENODEV;
1798
1799 uart_remove_one_port(&pmz_uart_reg, &uap->port);
1800
1801 platform_set_drvdata(pdev, NULL);
1802 uap->port.dev = NULL;
1803
1804 return 0;
1805}
1806
1807#endif /* !CONFIG_PPC_PMAC */
1808
1809#ifdef CONFIG_SERIAL_PMACZILOG_CONSOLE
1810
1811static void pmz_console_write(struct console *con, const char *s, unsigned int count);
1812static int __init pmz_console_setup(struct console *co, char *options);
1813
1814static struct console pmz_console = {
1815 .name = PMACZILOG_NAME,
1816 .write = pmz_console_write,
1817 .device = uart_console_device,
1818 .setup = pmz_console_setup,
1819 .flags = CON_PRINTBUFFER,
1820 .index = -1,
1821 .data = &pmz_uart_reg,
1822};
1823
1824#define PMACZILOG_CONSOLE &pmz_console
1825#else /* CONFIG_SERIAL_PMACZILOG_CONSOLE */
1826#define PMACZILOG_CONSOLE (NULL)
1827#endif /* CONFIG_SERIAL_PMACZILOG_CONSOLE */
1828
1829/*
1830 * Register the driver, console driver and ports with the serial
1831 * core
1832 */
1833static int __init pmz_register(void)
1834{
1835 pmz_uart_reg.nr = pmz_ports_count;
1836 pmz_uart_reg.cons = PMACZILOG_CONSOLE;
1837
1838 /*
1839 * Register this driver with the serial core
1840 */
1841 return uart_register_driver(&pmz_uart_reg);
1842}
1843
1844#ifdef CONFIG_PPC_PMAC
1845
1846static struct of_device_id pmz_match[] =
1847{
1848 {
1849 .name = "ch-a",
1850 },
1851 {
1852 .name = "ch-b",
1853 },
1854 {},
1855};
1856MODULE_DEVICE_TABLE (of, pmz_match);
1857
1858static struct macio_driver pmz_driver = {
1859 .driver = {
1860 .name = "pmac_zilog",
1861 .owner = THIS_MODULE,
1862 .of_match_table = pmz_match,
1863 },
1864 .probe = pmz_attach,
1865 .remove = pmz_detach,
1866 .suspend = pmz_suspend,
1867 .resume = pmz_resume,
1868};
1869
1870#else
1871
1872static struct platform_driver pmz_driver = {
1873 .remove = __exit_p(pmz_detach),
1874 .driver = {
1875 .name = "scc",
1876 .owner = THIS_MODULE,
1877 },
1878};
1879
1880#endif /* !CONFIG_PPC_PMAC */
1881
1882static int __init init_pmz(void)
1883{
1884 int rc, i;
1885 printk(KERN_INFO "%s\n", version);
1886
1887 /*
1888 * First, we need to do a direct OF-based probe pass. We
1889 * do that because we want serial console up before the
1890 * macio stuffs calls us back, and since that makes it
1891 * easier to pass the proper number of channels to
1892 * uart_register_driver()
1893 */
1894 if (pmz_ports_count == 0)
1895 pmz_probe();
1896
1897 /*
1898 * Bail early if no port found
1899 */
1900 if (pmz_ports_count == 0)
1901 return -ENODEV;
1902
1903 /*
1904 * Now we register with the serial layer
1905 */
1906 rc = pmz_register();
1907 if (rc) {
1908 printk(KERN_ERR
1909 "pmac_zilog: Error registering serial device, disabling pmac_zilog.\n"
1910 "pmac_zilog: Did another serial driver already claim the minors?\n");
1911 /* effectively "pmz_unprobe()" */
1912 for (i=0; i < pmz_ports_count; i++)
1913 pmz_dispose_port(&pmz_ports[i]);
1914 return rc;
1915 }
1916
1917 /*
1918 * Then we register the macio driver itself
1919 */
1920#ifdef CONFIG_PPC_PMAC
1921 return macio_register_driver(&pmz_driver);
1922#else
1923 return platform_driver_probe(&pmz_driver, pmz_attach);
1924#endif
1925}
1926
1927static void __exit exit_pmz(void)
1928{
1929 int i;
1930
1931#ifdef CONFIG_PPC_PMAC
1932 /* Get rid of macio-driver (detach from macio) */
1933 macio_unregister_driver(&pmz_driver);
1934#else
1935 platform_driver_unregister(&pmz_driver);
1936#endif
1937
1938 for (i = 0; i < pmz_ports_count; i++) {
1939 struct uart_pmac_port *uport = &pmz_ports[i];
1940#ifdef CONFIG_PPC_PMAC
1941 if (uport->node != NULL)
1942 pmz_dispose_port(uport);
1943#else
1944 if (uport->pdev != NULL)
1945 pmz_dispose_port(uport);
1946#endif
1947 }
1948 /* Unregister UART driver */
1949 uart_unregister_driver(&pmz_uart_reg);
1950}
1951
1952#ifdef CONFIG_SERIAL_PMACZILOG_CONSOLE
1953
1954static void pmz_console_putchar(struct uart_port *port, int ch)
1955{
1956 struct uart_pmac_port *uap = (struct uart_pmac_port *)port;
1957
1958 /* Wait for the transmit buffer to empty. */
1959 while ((read_zsreg(uap, R0) & Tx_BUF_EMP) == 0)
1960 udelay(5);
1961 write_zsdata(uap, ch);
1962}
1963
1964/*
1965 * Print a string to the serial port trying not to disturb
1966 * any possible real use of the port...
1967 */
1968static void pmz_console_write(struct console *con, const char *s, unsigned int count)
1969{
1970 struct uart_pmac_port *uap = &pmz_ports[con->index];
1971 unsigned long flags;
1972
1973 spin_lock_irqsave(&uap->port.lock, flags);
1974
1975 /* Turn of interrupts and enable the transmitter. */
1976 write_zsreg(uap, R1, uap->curregs[1] & ~TxINT_ENAB);
1977 write_zsreg(uap, R5, uap->curregs[5] | TxENABLE | RTS | DTR);
1978
1979 uart_console_write(&uap->port, s, count, pmz_console_putchar);
1980
1981 /* Restore the values in the registers. */
1982 write_zsreg(uap, R1, uap->curregs[1]);
1983 /* Don't disable the transmitter. */
1984
1985 spin_unlock_irqrestore(&uap->port.lock, flags);
1986}
1987
1988/*
1989 * Setup the serial console
1990 */
1991static int __init pmz_console_setup(struct console *co, char *options)
1992{
1993 struct uart_pmac_port *uap;
1994 struct uart_port *port;
1995 int baud = 38400;
1996 int bits = 8;
1997 int parity = 'n';
1998 int flow = 'n';
1999 unsigned long pwr_delay;
2000
2001 /*
2002 * XServe's default to 57600 bps
2003 */
2004 if (of_machine_is_compatible("RackMac1,1")
2005 || of_machine_is_compatible("RackMac1,2")
2006 || of_machine_is_compatible("MacRISC4"))
2007 baud = 57600;
2008
2009 /*
2010 * Check whether an invalid uart number has been specified, and
2011 * if so, search for the first available port that does have
2012 * console support.
2013 */
2014 if (co->index >= pmz_ports_count)
2015 co->index = 0;
2016 uap = &pmz_ports[co->index];
2017#ifdef CONFIG_PPC_PMAC
2018 if (uap->node == NULL)
2019 return -ENODEV;
2020#else
2021 if (uap->pdev == NULL)
2022 return -ENODEV;
2023#endif
2024 port = &uap->port;
2025
2026 /*
2027 * Mark port as beeing a console
2028 */
2029 uap->flags |= PMACZILOG_FLAG_IS_CONS;
2030
2031 /*
2032 * Temporary fix for uart layer who didn't setup the spinlock yet
2033 */
2034 spin_lock_init(&port->lock);
2035
2036 /*
2037 * Enable the hardware
2038 */
2039 pwr_delay = __pmz_startup(uap);
2040 if (pwr_delay)
2041 mdelay(pwr_delay);
2042
2043 if (options)
2044 uart_parse_options(options, &baud, &parity, &bits, &flow);
2045
2046 return uart_set_options(port, co, baud, parity, bits, flow);
2047}
2048
2049static int __init pmz_console_init(void)
2050{
2051 /* Probe ports */
2052 pmz_probe();
2053
2054 /* TODO: Autoprobe console based on OF */
2055 /* pmz_console.index = i; */
2056 register_console(&pmz_console);
2057
2058 return 0;
2059
2060}
2061console_initcall(pmz_console_init);
2062#endif /* CONFIG_SERIAL_PMACZILOG_CONSOLE */
2063
2064module_init(init_pmz);
2065module_exit(exit_pmz);