xref: /openbmc/linux/drivers/tty/serial/pmac_zilog.c (revision 724ba675)
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 
66 MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>");
67 MODULE_DESCRIPTION("Driver for the Mac and PowerMac serial ports.");
68 MODULE_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  */
88 static struct uart_pmac_port	pmz_ports[MAX_ZS_PORTS];
89 static int			pmz_ports_count;
90 
91 static 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  */
105 static 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  */
184 static 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 
196 static 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 
208 static 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 			spin_unlock(&uap->port.lock);
250 			swallow = uart_handle_sysrq_char(&uap->port, ch);
251 			spin_lock(&uap->port.lock);
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 
315 static 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 
348 static 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 
420 ack_tx_int:
421 	write_zsreg(uap, R0, RES_Tx_P);
422 	zssync(uap);
423 }
424 
425 /* Hrm... we register that twice, fixme later.... */
426 static 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 	spin_lock(&uap_a->port.lock);
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 	spin_unlock(&uap_a->port.lock);
460 	if (push)
461 		tty_flip_buffer_push(&uap->port.state->port);
462 
463 	if (!uap_b)
464 		goto out;
465 
466 	spin_lock(&uap_b->port.lock);
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 	spin_unlock(&uap_b->port.lock);
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  */
495 static inline u8 pmz_peek_status(struct uart_pmac_port *uap)
496 {
497 	unsigned long flags;
498 	u8 status;
499 
500 	spin_lock_irqsave(&uap->port.lock, flags);
501 	status = read_zsreg(uap, R0);
502 	spin_unlock_irqrestore(&uap->port.lock, flags);
503 
504 	return status;
505 }
506 
507 /*
508  * Check if transmitter is empty
509  * The port lock is not held.
510  */
511 static 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  */
527 static 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  */
567 static 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  */
591 static 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  */
600 static 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  */
642 static 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  */
655 static 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  */
675 static 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 	spin_lock_irqsave(&port->lock, 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 	spin_unlock_irqrestore(&port->lock, 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  */
707 static 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 
738 static 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  */
765 static 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  */
809 static 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 
864 static void pmz_irda_reset(struct uart_pmac_port *uap)
865 {
866 	unsigned long flags;
867 
868 	spin_lock_irqsave(&uap->port.lock, flags);
869 	uap->curregs[R5] |= DTR;
870 	write_zsreg(uap, R5, uap->curregs[R5]);
871 	zssync(uap);
872 	spin_unlock_irqrestore(&uap->port.lock, flags);
873 	msleep(110);
874 
875 	spin_lock_irqsave(&uap->port.lock, flags);
876 	uap->curregs[R5] &= ~DTR;
877 	write_zsreg(uap, R5, uap->curregs[R5]);
878 	zssync(uap);
879 	spin_unlock_irqrestore(&uap->port.lock, 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  */
887 static 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 		spin_lock_irqsave(&port->lock, flags);
900 		pwr_delay = __pmz_startup(uap);
901 		spin_unlock_irqrestore(&port->lock, 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 	spin_lock_irqsave(&port->lock, flags);
925 	pmz_interrupt_control(uap, 1);
926 	spin_unlock_irqrestore(&port->lock, flags);
927 
928 	return 0;
929 }
930 
931 static void pmz_shutdown(struct uart_port *port)
932 {
933 	struct uart_pmac_port *uap = to_pmz(port);
934 	unsigned long flags;
935 
936 	spin_lock_irqsave(&port->lock, 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 	spin_unlock_irqrestore(&port->lock, flags);
952 
953 	/* Release interrupt handler */
954 	free_irq(uap->port.irq, uap);
955 
956 	spin_lock_irqsave(&port->lock, 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 	spin_unlock_irqrestore(&port->lock, flags);
964 }
965 
966 /* Shared by TTY driver and serial console setup.  The port lock is held
967  * and local interrupts are disabled.
968  */
969 static 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  */
1072 static 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 
1202 static 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.  */
1244 static 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 	spin_lock_irqsave(&port->lock, 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 	spin_unlock_irqrestore(&port->lock, flags);
1263 }
1264 
1265 static 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  */
1279 static void pmz_release_port(struct uart_port *port)
1280 {
1281 }
1282 
1283 static int pmz_request_port(struct uart_port *port)
1284 {
1285 	return 0;
1286 }
1287 
1288 /* These do not need to do anything interesting either.  */
1289 static 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. */
1294 static int pmz_verify_port(struct uart_port *port, struct serial_struct *ser)
1295 {
1296 	return -EINVAL;
1297 }
1298 
1299 #ifdef CONFIG_CONSOLE_POLL
1300 
1301 static 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 
1317 static 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 
1330 static 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  */
1360 static 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  */
1460 static 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  */
1474 static 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  */
1510 static 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 
1531 static 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 
1546 static 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  */
1564 static 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  */
1634 extern struct platform_device scc_a_pdev, scc_b_pdev;
1635 
1636 static 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 
1669 static 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 
1696 static void pmz_dispose_port(struct uart_pmac_port *uap)
1697 {
1698 	memset(uap, 0, sizeof(struct uart_pmac_port));
1699 }
1700 
1701 static 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 
1720 static 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 
1738 static void pmz_console_write(struct console *con, const char *s, unsigned int count);
1739 static int __init pmz_console_setup(struct console *co, char *options);
1740 
1741 static 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  */
1760 static 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 
1773 static const struct of_device_id pmz_match[] =
1774 {
1775 	{
1776 	.name		= "ch-a",
1777 	},
1778 	{
1779 	.name		= "ch-b",
1780 	},
1781 	{},
1782 };
1783 MODULE_DEVICE_TABLE (of, pmz_match);
1784 
1785 static 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 
1799 static 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 
1808 static 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 
1852 static 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 
1879 static 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  */
1894 static 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 	spin_lock_irqsave(&uap->port.lock, 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 	spin_unlock_irqrestore(&uap->port.lock, flags);
1912 }
1913 
1914 /*
1915  * Setup the serial console
1916  */
1917 static 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 
1975 static 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 }
1990 console_initcall(pmz_console_init);
1991 #endif /* CONFIG_SERIAL_PMACZILOG_CONSOLE */
1992 
1993 module_init(init_pmz);
1994 module_exit(exit_pmz);
1995