1 // SPDX-License-Identifier: GPL-2.0+
3 * Driver for PowerMac Z85c30 based ESCC cell found in the
4 * "macio" ASICs of various PowerMac models
6 * Copyright (C) 2003 Ben. Herrenschmidt (benh@kernel.crashing.org)
8 * Derived from drivers/macintosh/macserial.c by Paul Mackerras
9 * and drivers/serial/sunzilog.c by David S. Miller
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...
17 * 2004-08-06 Harald Welte <laforge@gnumonks.org>
18 * - Enable BREAK interrupt
19 * - Add support for sysreq
21 * TODO: - Add DMA support
22 * - Defer port shutdown to a few seconds after close
23 * - maybe put something right into uap->clk_divisor
27 #undef USE_CTRL_O_SYSRQ
29 #include <linux/module.h>
30 #include <linux/tty.h>
32 #include <linux/tty_flip.h>
33 #include <linux/major.h>
34 #include <linux/string.h>
35 #include <linux/fcntl.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>
52 #ifdef CONFIG_PPC_PMAC
53 #include <asm/machdep.h>
54 #include <asm/pmac_feature.h>
55 #include <asm/macio.h>
57 #include <linux/platform_device.h>
58 #define of_machine_is_compatible(x) (0)
61 #include <linux/serial.h>
62 #include <linux/serial_core.h>
64 #include "pmac_zilog.h"
66 MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>");
67 MODULE_DESCRIPTION("Driver for the Mac and PowerMac serial ports.");
68 MODULE_LICENSE("GPL");
70 #ifdef CONFIG_SERIAL_PMACZILOG_TTYS
71 #define PMACZILOG_MAJOR TTY_MAJOR
72 #define PMACZILOG_MINOR 64
73 #define PMACZILOG_NAME "ttyS"
75 #define PMACZILOG_MAJOR 204
76 #define PMACZILOG_MINOR 192
77 #define PMACZILOG_NAME "ttyPZ"
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)
85 * For the sake of early serial console, we can do a pre-probe
86 * (optional) of the ports at rather early boot time.
88 static struct uart_pmac_port pmz_ports[MAX_ZS_PORTS];
89 static int pmz_ports_count;
91 static struct uart_driver pmz_uart_reg = {
93 .driver_name = PMACZILOG_NAME,
94 .dev_name = PMACZILOG_NAME,
95 .major = PMACZILOG_MAJOR,
96 .minor = PMACZILOG_MINOR,
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.
105 static void pmz_load_zsregs(struct uart_pmac_port *uap, u8 *regs)
109 /* Let pending transmits finish. */
110 for (i = 0; i < 1000; i++) {
111 unsigned char stat = read_zsreg(uap, R1);
123 /* Disable all interrupts. */
125 regs[R1] & ~(RxINT_MASK | TxINT_ENAB | EXT_INT_ENAB));
127 /* Set parity, sync config, stop bits, and clock divisor. */
128 write_zsreg(uap, R4, regs[R4]);
130 /* Set misc. TX/RX control bits. */
131 write_zsreg(uap, R10, regs[R10]);
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);
137 /* now set R7 "prime" on ESCC */
138 write_zsreg(uap, R15, regs[R15] | EN85C30);
139 write_zsreg(uap, R7, regs[R7P]);
141 /* make sure we use R7 "non-prime" on ESCC */
142 write_zsreg(uap, R15, regs[R15] & ~EN85C30);
144 /* Synchronous mode config. */
145 write_zsreg(uap, R6, regs[R6]);
146 write_zsreg(uap, R7, regs[R7]);
148 /* Disable baud generator. */
149 write_zsreg(uap, R14, regs[R14] & ~BRENAB);
151 /* Clock mode control. */
152 write_zsreg(uap, R11, regs[R11]);
154 /* Lower and upper byte of baud rate generator divisor. */
155 write_zsreg(uap, R12, regs[R12]);
156 write_zsreg(uap, R13, regs[R13]);
158 /* Now rewrite R14, with BRENAB (if set). */
159 write_zsreg(uap, R14, regs[R14]);
161 /* Reset external status interrupts. */
162 write_zsreg(uap, R0, RES_EXT_INT);
163 write_zsreg(uap, R0, RES_EXT_INT);
165 /* Rewrite R3/R5, this time without enables masked. */
166 write_zsreg(uap, R3, regs[R3]);
167 write_zsreg(uap, R5, regs[R5]);
169 /* Rewrite R1, this time without IRQ enabled masked. */
170 write_zsreg(uap, R1, regs[R1]);
172 /* Enable interrupts */
173 write_zsreg(uap, R9, regs[R9]);
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.
182 * The UART port lock must be held and local interrupts disabled.
184 static void pmz_maybe_update_regs(struct uart_pmac_port *uap)
186 if (!ZS_REGS_HELD(uap)) {
187 if (ZS_TX_ACTIVE(uap)) {
188 uap->flags |= PMACZILOG_FLAG_REGS_HELD;
190 pmz_debug("pmz: maybe_update_regs: updating\n");
191 pmz_load_zsregs(uap, uap->curregs);
196 static void pmz_interrupt_control(struct uart_pmac_port *uap, int enable)
199 uap->curregs[1] |= INT_ALL_Rx | TxINT_ENAB;
200 if (!ZS_IS_EXTCLK(uap))
201 uap->curregs[1] |= EXT_INT_ENAB;
203 uap->curregs[1] &= ~(EXT_INT_ENAB | TxINT_ENAB | RxINT_MASK);
205 write_zsreg(uap, R1, uap->curregs[1]);
208 static bool pmz_receive_chars(struct uart_pmac_port *uap)
209 __must_hold(&uap->port.lock)
211 struct tty_port *port;
212 unsigned char ch, r1, drop, flag;
215 /* Sanity check, make sure the old bug is no longer happening */
216 if (uap->port.state == NULL) {
218 (void)read_zsdata(uap);
221 port = &uap->port.state->port;
226 r1 = read_zsreg(uap, R1);
227 ch = read_zsdata(uap);
229 if (r1 & (PAR_ERR | Rx_OVR | CRC_ERR)) {
230 write_zsreg(uap, R0, ERR_RES);
234 ch &= uap->parity_mask;
235 if (ch == 0 && uap->flags & PMACZILOG_FLAG_BREAK) {
236 uap->flags &= ~PMACZILOG_FLAG_BREAK;
239 #if defined(CONFIG_MAGIC_SYSRQ) && defined(CONFIG_SERIAL_CORE_CONSOLE)
240 #ifdef USE_CTRL_O_SYSRQ
241 /* Handle the SysRq ^O Hack */
243 uap->port.sysrq = jiffies + HZ*5;
246 #endif /* USE_CTRL_O_SYSRQ */
247 if (uap->port.sysrq) {
249 spin_unlock(&uap->port.lock);
250 swallow = uart_handle_sysrq_char(&uap->port, ch);
251 spin_lock(&uap->port.lock);
255 #endif /* CONFIG_MAGIC_SYSRQ && CONFIG_SERIAL_CORE_CONSOLE */
257 /* A real serial line, record the character and status. */
262 uap->port.icount.rx++;
264 if (r1 & (PAR_ERR | Rx_OVR | CRC_ERR | 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))
272 else if (r1 & PAR_ERR)
273 uap->port.icount.parity++;
274 else if (r1 & CRC_ERR)
275 uap->port.icount.frame++;
277 uap->port.icount.overrun++;
278 r1 &= uap->port.read_status_mask;
281 else if (r1 & PAR_ERR)
283 else if (r1 & CRC_ERR)
287 if (uap->port.ignore_status_mask == 0xff ||
288 (r1 & uap->port.ignore_status_mask) == 0) {
289 tty_insert_flip_char(port, ch, flag);
292 tty_insert_flip_char(port, 0, TTY_OVERRUN);
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
301 if ((++loops) > 1000)
303 ch = read_zsreg(uap, R0);
304 if (!(ch & Rx_CH_AV))
310 pmz_interrupt_control(uap, 0);
311 pmz_error("pmz: rx irq flood !\n");
315 static void pmz_status_handle(struct uart_pmac_port *uap)
317 unsigned char status;
319 status = read_zsreg(uap, R0);
320 write_zsreg(uap, R0, RES_EXT_INT);
323 if (ZS_IS_OPEN(uap) && ZS_WANTS_MODEM_STATUS(uap)) {
324 if (status & SYNC_HUNT)
325 uap->port.icount.dsr++;
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
332 if ((status ^ uap->prev_status) & DCD)
333 uart_handle_dcd_change(&uap->port,
335 if ((status ^ uap->prev_status) & CTS)
336 uart_handle_cts_change(&uap->port,
339 wake_up_interruptible(&uap->port.state->port.delta_msr_wait);
342 if (status & BRK_ABRT)
343 uap->flags |= PMACZILOG_FLAG_BREAK;
345 uap->prev_status = status;
348 static void pmz_transmit_chars(struct uart_pmac_port *uap)
350 struct circ_buf *xmit;
352 if (ZS_IS_CONS(uap)) {
353 unsigned char status = read_zsreg(uap, R0);
355 /* TX still busy? Just wait for the next TX done interrupt.
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
363 if (!(status & Tx_BUF_EMP))
367 uap->flags &= ~PMACZILOG_FLAG_TX_ACTIVE;
369 if (ZS_REGS_HELD(uap)) {
370 pmz_load_zsregs(uap, uap->curregs);
371 uap->flags &= ~PMACZILOG_FLAG_REGS_HELD;
374 if (ZS_TX_STOPPED(uap)) {
375 uap->flags &= ~PMACZILOG_FLAG_TX_STOPPED;
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.
387 if (!ZS_IS_OPEN(uap))
390 if (uap->port.x_char) {
391 uap->flags |= PMACZILOG_FLAG_TX_ACTIVE;
392 write_zsdata(uap, uap->port.x_char);
394 uap->port.icount.tx++;
395 uap->port.x_char = 0;
399 if (uap->port.state == NULL)
401 xmit = &uap->port.state->xmit;
402 if (uart_circ_empty(xmit)) {
403 uart_write_wakeup(&uap->port);
406 if (uart_tx_stopped(&uap->port))
409 uap->flags |= PMACZILOG_FLAG_TX_ACTIVE;
410 write_zsdata(uap, xmit->buf[xmit->tail]);
413 uart_xmit_advance(&uap->port, 1);
415 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
416 uart_write_wakeup(&uap->port);
421 write_zsreg(uap, R0, RES_Tx_P);
425 /* Hrm... we register that twice, fixme later.... */
426 static irqreturn_t pmz_interrupt(int irq, void *dev_id)
428 struct uart_pmac_port *uap = dev_id;
429 struct uart_pmac_port *uap_a;
430 struct uart_pmac_port *uap_b;
435 uap_a = pmz_get_port_A(uap);
438 spin_lock(&uap_a->port.lock);
439 r3 = read_zsreg(uap_a, R3);
443 if (r3 & (CHAEXT | CHATxIP | CHARxIP)) {
444 if (!ZS_IS_OPEN(uap_a)) {
445 pmz_debug("ChanA interrupt while not open !\n");
448 write_zsreg(uap_a, R0, RES_H_IUS);
451 pmz_status_handle(uap_a);
453 push = pmz_receive_chars(uap_a);
455 pmz_transmit_chars(uap_a);
459 spin_unlock(&uap_a->port.lock);
461 tty_flip_buffer_push(&uap->port.state->port);
466 spin_lock(&uap_b->port.lock);
468 if (r3 & (CHBEXT | CHBTxIP | CHBRxIP)) {
469 if (!ZS_IS_OPEN(uap_b)) {
470 pmz_debug("ChanB interrupt while not open !\n");
473 write_zsreg(uap_b, R0, RES_H_IUS);
476 pmz_status_handle(uap_b);
478 push = pmz_receive_chars(uap_b);
480 pmz_transmit_chars(uap_b);
484 spin_unlock(&uap_b->port.lock);
486 tty_flip_buffer_push(&uap->port.state->port);
493 * Peek the status register, lock not held by caller
495 static inline u8 pmz_peek_status(struct uart_pmac_port *uap)
500 spin_lock_irqsave(&uap->port.lock, flags);
501 status = read_zsreg(uap, R0);
502 spin_unlock_irqrestore(&uap->port.lock, flags);
508 * Check if transmitter is empty
509 * The port lock is not held.
511 static unsigned int pmz_tx_empty(struct uart_port *port)
513 unsigned char status;
515 status = pmz_peek_status(to_pmz(port));
516 if (status & Tx_BUF_EMP)
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 ?
527 static void pmz_set_mctrl(struct uart_port *port, unsigned int mctrl)
529 struct uart_pmac_port *uap = to_pmz(port);
530 unsigned char set_bits, clear_bits;
532 /* Do nothing for irda for now... */
535 /* We get called during boot with a port not up yet */
536 if (!(ZS_IS_OPEN(uap) || ZS_IS_CONS(uap)))
539 set_bits = clear_bits = 0;
541 if (ZS_IS_INTMODEM(uap)) {
542 if (mctrl & TIOCM_RTS)
547 if (mctrl & TIOCM_DTR)
552 /* NOTE: Not subject to 'transmitter active' rule. */
553 uap->curregs[R5] |= set_bits;
554 uap->curregs[R5] &= ~clear_bits;
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]);
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.
567 static unsigned int pmz_get_mctrl(struct uart_port *port)
569 struct uart_pmac_port *uap = to_pmz(port);
570 unsigned char status;
573 status = read_zsreg(uap, R0);
578 if (status & SYNC_HUNT)
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.
591 static void pmz_stop_tx(struct uart_port *port)
593 to_pmz(port)->flags |= PMACZILOG_FLAG_TX_STOPPED;
598 * The port lock is held and interrupts are disabled.
600 static void pmz_start_tx(struct uart_port *port)
602 struct uart_pmac_port *uap = to_pmz(port);
603 unsigned char status;
605 uap->flags |= PMACZILOG_FLAG_TX_ACTIVE;
606 uap->flags &= ~PMACZILOG_FLAG_TX_STOPPED;
608 status = read_zsreg(uap, R0);
610 /* TX busy? Just wait for the TX done interrupt. */
611 if (!(status & Tx_BUF_EMP))
614 /* Send the first character to jump-start the TX done
615 * IRQ sending engine.
618 write_zsdata(uap, port->x_char);
623 struct circ_buf *xmit = &port->state->xmit;
625 if (uart_circ_empty(xmit))
627 write_zsdata(uap, xmit->buf[xmit->tail]);
629 uart_xmit_advance(port, 1);
631 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
632 uart_write_wakeup(&uap->port);
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.
642 static void pmz_stop_rx(struct uart_port *port)
644 struct uart_pmac_port *uap = to_pmz(port);
646 /* Disable all RX interrupts. */
647 uap->curregs[R1] &= ~RxINT_MASK;
648 pmz_maybe_update_regs(uap);
652 * Enable modem status change interrupts
653 * The port lock is held.
655 static void pmz_enable_ms(struct uart_port *port)
657 struct uart_pmac_port *uap = to_pmz(port);
658 unsigned char new_reg;
662 new_reg = uap->curregs[R15] | (DCDIE | SYNCIE | CTSIE);
663 if (new_reg != uap->curregs[R15]) {
664 uap->curregs[R15] = new_reg;
666 /* NOTE: Not subject to 'transmitter active' rule. */
667 write_zsreg(uap, R15, uap->curregs[R15]);
672 * Control break state emission
673 * The port lock is not held.
675 static void pmz_break_ctl(struct uart_port *port, int break_state)
677 struct uart_pmac_port *uap = to_pmz(port);
678 unsigned char set_bits, clear_bits, new_reg;
681 set_bits = clear_bits = 0;
686 clear_bits |= SND_BRK;
688 spin_lock_irqsave(&port->lock, flags);
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]);
696 spin_unlock_irqrestore(&port->lock, flags);
699 #ifdef CONFIG_PPC_PMAC
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.
707 static int pmz_set_scc_power(struct uart_pmac_port *uap, int 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);
723 /* TODO: Make that depend on a timer, don't power down
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);
731 pmac_call_feature(PMAC_FTR_SCC_ENABLE, uap->node, uap->port_type, 0);
738 static int pmz_set_scc_power(struct uart_pmac_port *uap, int state)
743 #endif /* !CONFIG_PPC_PMAC */
746 * FixZeroBug....Works around a bug in the SCC receiving channel.
747 * Inspired from Darwin code, 15 Sept. 2000 -DanM
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:
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.
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.
765 static void pmz_fix_zero_bug_scc(struct uart_pmac_port *uap)
767 write_zsreg(uap, 9, ZS_IS_CHANNEL_A(uap) ? CHRA : CHRB);
770 write_zsreg(uap, 9, (ZS_IS_CHANNEL_A(uap) ? CHRA : CHRB) | NV);
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 */
787 /* The channel should be OK now, but it is probably receiving
789 * Switch to asynchronous mode, disable the receiver,
790 * and discard everything in the receive buffer.
792 write_zsreg(uap, 9, NV);
793 write_zsreg(uap, 4, X16CLK | SB_MASK);
794 write_zsreg(uap, 3, Rx8);
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);
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.
809 static int __pmz_startup(struct uart_pmac_port *uap)
813 memset(&uap->curregs, 0, sizeof(uap->curregs));
815 /* Power up the SCC & underlying hardware (modem/irda) */
816 pwr_delay = pmz_set_scc_power(uap, 1);
818 /* Nice buggy HW ... */
819 pmz_fix_zero_bug_scc(uap);
821 /* Reset the channel */
822 uap->curregs[R9] = 0;
823 write_zsreg(uap, 9, ZS_IS_CHANNEL_A(uap) ? CHRA : CHRB);
826 write_zsreg(uap, 9, 0);
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);
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;
846 /* Clear handshaking, enable BREAK interrupts */
847 uap->curregs[R15] = BRKIE;
849 /* Master interrupt enable */
850 uap->curregs[R9] |= NV | MIE;
852 pmz_load_zsregs(uap, uap->curregs);
854 /* Enable receiver and transmitter. */
855 write_zsreg(uap, R3, uap->curregs[R3] |= RxENABLE);
856 write_zsreg(uap, R5, uap->curregs[R5] |= TxENABLE);
858 /* Remember status for DCD/CTS changes */
859 uap->prev_status = read_zsreg(uap, R0);
864 static void pmz_irda_reset(struct uart_pmac_port *uap)
868 spin_lock_irqsave(&uap->port.lock, flags);
869 uap->curregs[R5] |= DTR;
870 write_zsreg(uap, R5, uap->curregs[R5]);
872 spin_unlock_irqrestore(&uap->port.lock, flags);
875 spin_lock_irqsave(&uap->port.lock, flags);
876 uap->curregs[R5] &= ~DTR;
877 write_zsreg(uap, R5, uap->curregs[R5]);
879 spin_unlock_irqrestore(&uap->port.lock, flags);
884 * This is the "normal" startup routine, using the above one
885 * wrapped with the lock and doing a schedule delay
887 static int pmz_startup(struct uart_port *port)
889 struct uart_pmac_port *uap = to_pmz(port);
893 uap->flags |= PMACZILOG_FLAG_IS_OPEN;
895 /* A console is never powered down. Else, power up and
896 * initialize the chip
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);
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);
911 /* Right now, we deal with delay by blocking here, I'll be
914 if (pwr_delay != 0) {
915 pmz_debug("pmz: delaying %d ms\n", pwr_delay);
919 /* IrDA reset is done now */
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);
931 static void pmz_shutdown(struct uart_port *port)
933 struct uart_pmac_port *uap = to_pmz(port);
936 spin_lock_irqsave(&port->lock, flags);
938 /* Disable interrupt requests for the channel */
939 pmz_interrupt_control(uap, 0);
941 if (!ZS_IS_CONS(uap)) {
942 /* Disable receiver and transmitter */
943 uap->curregs[R3] &= ~RxENABLE;
944 uap->curregs[R5] &= ~TxENABLE;
946 /* Disable break assertion */
947 uap->curregs[R5] &= ~SND_BRK;
948 pmz_maybe_update_regs(uap);
951 spin_unlock_irqrestore(&port->lock, flags);
953 /* Release interrupt handler */
954 free_irq(uap->port.irq, uap);
956 spin_lock_irqsave(&port->lock, flags);
958 uap->flags &= ~PMACZILOG_FLAG_IS_OPEN;
960 if (!ZS_IS_CONS(uap))
961 pmz_set_scc_power(uap, 0); /* Shut the chip down */
963 spin_unlock_irqrestore(&port->lock, flags);
966 /* Shared by TTY driver and serial console setup. The port lock is held
967 * and local interrupts are disabled.
969 static void pmz_convert_to_zs(struct uart_pmac_port *uap, unsigned int cflag,
970 unsigned int iflag, unsigned long baud)
974 /* Switch to external clocking for IrDA high clock rates. That
975 * code could be re-used for Midi interfaces with different
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;
987 case ZS_CLOCK/16: /* 230400 */
988 uap->curregs[R4] = X16CLK;
989 uap->curregs[R11] = 0;
990 uap->curregs[R14] = 0;
992 case ZS_CLOCK/32: /* 115200 */
993 uap->curregs[R4] = X32CLK;
994 uap->curregs[R11] = 0;
995 uap->curregs[R14] = 0;
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;
1005 uap->flags &= ~PMACZILOG_FLAG_IS_EXTCLK;
1008 /* Character size, stop bits, and parity. */
1009 uap->curregs[3] &= ~RxN_MASK;
1010 uap->curregs[5] &= ~TxN_MASK;
1012 switch (cflag & CSIZE) {
1014 uap->curregs[3] |= Rx5;
1015 uap->curregs[5] |= Tx5;
1016 uap->parity_mask = 0x1f;
1019 uap->curregs[3] |= Rx6;
1020 uap->curregs[5] |= Tx6;
1021 uap->parity_mask = 0x3f;
1024 uap->curregs[3] |= Rx7;
1025 uap->curregs[5] |= Tx7;
1026 uap->parity_mask = 0x7f;
1030 uap->curregs[3] |= Rx8;
1031 uap->curregs[5] |= Tx8;
1032 uap->parity_mask = 0xff;
1035 uap->curregs[4] &= ~(SB_MASK);
1037 uap->curregs[4] |= SB2;
1039 uap->curregs[4] |= SB1;
1041 uap->curregs[4] |= PAR_ENAB;
1043 uap->curregs[4] &= ~PAR_ENAB;
1044 if (!(cflag & PARODD))
1045 uap->curregs[4] |= PAR_EVEN;
1047 uap->curregs[4] &= ~PAR_EVEN;
1049 uap->port.read_status_mask = Rx_OVR;
1051 uap->port.read_status_mask |= CRC_ERR | PAR_ERR;
1052 if (iflag & (IGNBRK | BRKINT | PARMRK))
1053 uap->port.read_status_mask |= BRK_ABRT;
1055 uap->port.ignore_status_mask = 0;
1057 uap->port.ignore_status_mask |= CRC_ERR | PAR_ERR;
1058 if (iflag & IGNBRK) {
1059 uap->port.ignore_status_mask |= BRK_ABRT;
1061 uap->port.ignore_status_mask |= Rx_OVR;
1064 if ((cflag & CREAD) == 0)
1065 uap->port.ignore_status_mask = 0xff;
1070 * Set the irda codec on the imac to the specified baud rate.
1072 static void pmz_irda_setup(struct uart_pmac_port *uap, unsigned long *baud)
1100 /* The FIR modes aren't really supported at this point, how
1101 * do we select the speed ? via the FCR on KeyLargo ?
1115 /* Wait for transmitter to drain */
1117 while ((read_zsreg(uap, R0) & Tx_BUF_EMP) == 0
1118 || (read_zsreg(uap, R1) & ALL_SNT) == 0) {
1120 pmz_error("transmitter didn't drain\n");
1126 /* Drain the receiver too */
1128 (void)read_zsdata(uap);
1129 (void)read_zsdata(uap);
1130 (void)read_zsdata(uap);
1132 while (read_zsreg(uap, R0) & Rx_CH_AV) {
1136 pmz_error("receiver didn't drain\n");
1141 /* Switch to command mode */
1142 uap->curregs[R5] |= DTR;
1143 write_zsreg(uap, R5, uap->curregs[R5]);
1147 /* Switch SCC to 19200 */
1148 pmz_convert_to_zs(uap, CS8, 0, 19200);
1149 pmz_load_zsregs(uap, uap->curregs);
1152 /* Write get_version command byte */
1153 write_zsdata(uap, 1);
1155 while ((read_zsreg(uap, R0) & Rx_CH_AV) == 0) {
1157 pmz_error("irda_setup timed out on get_version byte\n");
1162 version = read_zsdata(uap);
1165 pmz_info("IrDA: dongle version %d not supported\n", version);
1169 /* Send speed mode */
1170 write_zsdata(uap, cmdbyte);
1172 while ((read_zsreg(uap, R0) & Rx_CH_AV) == 0) {
1174 pmz_error("irda_setup timed out on speed mode byte\n");
1179 t = read_zsdata(uap);
1181 pmz_error("irda_setup speed mode byte = %x (%x)\n", t, cmdbyte);
1183 pmz_info("IrDA setup for %ld bps, dongle version: %d\n",
1186 (void)read_zsdata(uap);
1187 (void)read_zsdata(uap);
1188 (void)read_zsdata(uap);
1191 /* Switch back to data mode */
1192 uap->curregs[R5] &= ~DTR;
1193 write_zsreg(uap, R5, uap->curregs[R5]);
1196 (void)read_zsdata(uap);
1197 (void)read_zsdata(uap);
1198 (void)read_zsdata(uap);
1202 static void __pmz_set_termios(struct uart_port *port, struct ktermios *termios,
1203 const struct ktermios *old)
1205 struct uart_pmac_port *uap = to_pmz(port);
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
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);
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;
1233 uap->curregs[R15] &= ~(DCDIE | SYNCIE | CTSIE);
1234 uap->flags &= ~PMACZILOG_FLAG_MODEM_STATUS;
1237 /* Load registers to the chip */
1238 pmz_maybe_update_regs(uap);
1240 uart_update_timeout(port, termios->c_cflag, baud);
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)
1247 struct uart_pmac_port *uap = to_pmz(port);
1248 unsigned long flags;
1250 spin_lock_irqsave(&port->lock, flags);
1252 /* Disable IRQs on the port */
1253 pmz_interrupt_control(uap, 0);
1255 /* Setup new port configuration */
1256 __pmz_set_termios(port, termios, old);
1258 /* Re-enable IRQs on the port */
1259 if (ZS_IS_OPEN(uap))
1260 pmz_interrupt_control(uap, 1);
1262 spin_unlock_irqrestore(&port->lock, flags);
1265 static const char *pmz_type(struct uart_port *port)
1267 struct uart_pmac_port *uap = to_pmz(port);
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";
1276 /* We do not request/release mappings of the registers here, this
1277 * happens at early serial probe time.
1279 static void pmz_release_port(struct uart_port *port)
1283 static int pmz_request_port(struct uart_port *port)
1288 /* These do not need to do anything interesting either. */
1289 static void pmz_config_port(struct uart_port *port, int flags)
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)
1299 #ifdef CONFIG_CONSOLE_POLL
1301 static int pmz_poll_get_char(struct uart_port *port)
1303 struct uart_pmac_port *uap =
1304 container_of(port, struct uart_pmac_port, port);
1308 if ((read_zsreg(uap, R0) & Rx_CH_AV) != 0)
1309 return read_zsdata(uap);
1314 return NO_POLL_CHAR;
1317 static void pmz_poll_put_char(struct uart_port *port, unsigned char c)
1319 struct uart_pmac_port *uap =
1320 container_of(port, struct uart_pmac_port, port);
1322 /* Wait for the transmit buffer to empty. */
1323 while ((read_zsreg(uap, R0) & Tx_BUF_EMP) == 0)
1325 write_zsdata(uap, c);
1328 #endif /* CONFIG_CONSOLE_POLL */
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,
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,
1353 #ifdef CONFIG_PPC_PMAC
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
1360 static int __init pmz_init_port(struct uart_pmac_port *uap)
1362 struct device_node *np = uap->node;
1364 const struct slot_names_prop {
1369 struct resource r_ports;
1372 * Request & map chip registers
1374 if (of_address_to_resource(np, 0, &r_ports))
1376 uap->port.mapbase = r_ports.start;
1377 uap->port.membase = ioremap(uap->port.mapbase, 0x1000);
1379 uap->control_reg = uap->port.membase;
1380 uap->data_reg = uap->control_reg + 0x10;
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;
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");
1406 of_get_property(i2c_modem, "modem-id", NULL);
1407 if (mid) switch(*mid) {
1414 uap->port_type = PMAC_SCC_I2S1;
1416 printk(KERN_INFO "pmac_zilog: i2c-modem detected, id: %d\n",
1418 of_node_put(i2c_modem);
1420 printk(KERN_INFO "pmac_zilog: serial modem detected\n");
1425 * Init remaining bits of "port" structure
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;
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.
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);
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.
1452 pmz_convert_to_zs(uap, CS8, 0, 9600);
1458 * Get rid of a port on module removal
1460 static void pmz_dispose_port(struct uart_pmac_port *uap)
1462 struct device_node *np;
1465 iounmap(uap->control_reg);
1468 memset(uap, 0, sizeof(struct uart_pmac_port));
1472 * Called upon match with an escc node in the device-tree.
1474 static int pmz_attach(struct macio_dev *mdev, const struct of_device_id *match)
1476 struct uart_pmac_port *uap;
1479 /* Iterate the pmz_ports array to find a matching entry
1481 for (i = 0; i < MAX_ZS_PORTS; i++)
1482 if (pmz_ports[i].node == mdev->ofdev.dev.of_node)
1484 if (i >= MAX_ZS_PORTS)
1488 uap = &pmz_ports[i];
1490 uap->port.dev = &mdev->ofdev.dev;
1491 dev_set_drvdata(&mdev->ofdev.dev, uap);
1493 /* We still activate the port even when failing to request resources
1494 * to work around bugs in ancient Apple device-trees
1496 if (macio_request_resources(uap->dev, "pmac_zilog"))
1497 printk(KERN_WARNING "%pOFn: Failed to request resource"
1498 ", port still active\n",
1501 uap->flags |= PMACZILOG_FLAG_RSRC_REQUESTED;
1503 return uart_add_one_port(&pmz_uart_reg, &uap->port);
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...
1510 static int pmz_detach(struct macio_dev *mdev)
1512 struct uart_pmac_port *uap = dev_get_drvdata(&mdev->ofdev.dev);
1517 uart_remove_one_port(&pmz_uart_reg, &uap->port);
1519 if (uap->flags & PMACZILOG_FLAG_RSRC_REQUESTED) {
1520 macio_release_resources(uap->dev);
1521 uap->flags &= ~PMACZILOG_FLAG_RSRC_REQUESTED;
1523 dev_set_drvdata(&mdev->ofdev.dev, NULL);
1525 uap->port.dev = NULL;
1531 static int pmz_suspend(struct macio_dev *mdev, pm_message_t pm_state)
1533 struct uart_pmac_port *uap = dev_get_drvdata(&mdev->ofdev.dev);
1536 printk("HRM... pmz_suspend with NULL uap\n");
1540 uart_suspend_port(&pmz_uart_reg, &uap->port);
1546 static int pmz_resume(struct macio_dev *mdev)
1548 struct uart_pmac_port *uap = dev_get_drvdata(&mdev->ofdev.dev);
1553 uart_resume_port(&pmz_uart_reg, &uap->port);
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.
1564 static int __init pmz_probe(void)
1566 struct device_node *node_p, *node_a, *node_b, *np;
1571 * Find all escc chips in the system
1573 for_each_node_by_name(node_p, "escc") {
1575 * First get channel A/B node pointers
1577 * TODO: Add routines with proper locking to do that...
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);
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);
1595 * Fill basic fields in the port structures
1597 if (node_b != NULL) {
1598 pmz_ports[count].mate = &pmz_ports[count+1];
1599 pmz_ports[count+1].mate = &pmz_ports[count];
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;
1608 * Setup the ports for real
1610 rc = pmz_init_port(&pmz_ports[count]);
1611 if (rc == 0 && node_b != NULL)
1612 rc = pmz_init_port(&pmz_ports[count+1]);
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));
1622 pmz_ports_count = count;
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.
1634 extern struct platform_device scc_a_pdev, scc_b_pdev;
1636 static int __init pmz_init_port(struct uart_pmac_port *uap)
1638 struct resource *r_ports;
1641 r_ports = platform_get_resource(uap->pdev, IORESOURCE_MEM, 0);
1645 irq = platform_get_irq(uap->pdev, 0);
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;
1659 uap->control_reg = uap->port.membase;
1660 uap->data_reg = uap->control_reg + 4;
1662 uap->port.has_sysrq = IS_ENABLED(CONFIG_SERIAL_PMACZILOG_CONSOLE);
1664 pmz_convert_to_zs(uap, CS8, 0, 9600);
1669 static int __init pmz_probe(void)
1673 pmz_ports_count = 0;
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]);
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]);
1696 static void pmz_dispose_port(struct uart_pmac_port *uap)
1698 memset(uap, 0, sizeof(struct uart_pmac_port));
1701 static int __init pmz_attach(struct platform_device *pdev)
1703 struct uart_pmac_port *uap;
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)
1710 if (i >= pmz_ports_count)
1713 uap = &pmz_ports[i];
1714 uap->port.dev = &pdev->dev;
1715 platform_set_drvdata(pdev, uap);
1717 return uart_add_one_port(&pmz_uart_reg, &uap->port);
1720 static int __exit pmz_detach(struct platform_device *pdev)
1722 struct uart_pmac_port *uap = platform_get_drvdata(pdev);
1727 uart_remove_one_port(&pmz_uart_reg, &uap->port);
1729 uap->port.dev = NULL;
1734 #endif /* !CONFIG_PPC_PMAC */
1736 #ifdef CONFIG_SERIAL_PMACZILOG_CONSOLE
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);
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,
1748 .data = &pmz_uart_reg,
1751 #define PMACZILOG_CONSOLE &pmz_console
1752 #else /* CONFIG_SERIAL_PMACZILOG_CONSOLE */
1753 #define PMACZILOG_CONSOLE (NULL)
1754 #endif /* CONFIG_SERIAL_PMACZILOG_CONSOLE */
1757 * Register the driver, console driver and ports with the serial
1760 static int __init pmz_register(void)
1762 pmz_uart_reg.nr = pmz_ports_count;
1763 pmz_uart_reg.cons = PMACZILOG_CONSOLE;
1766 * Register this driver with the serial core
1768 return uart_register_driver(&pmz_uart_reg);
1771 #ifdef CONFIG_PPC_PMAC
1773 static const struct of_device_id pmz_match[] =
1783 MODULE_DEVICE_TABLE (of, pmz_match);
1785 static struct macio_driver pmz_driver = {
1787 .name = "pmac_zilog",
1788 .owner = THIS_MODULE,
1789 .of_match_table = pmz_match,
1791 .probe = pmz_attach,
1792 .remove = pmz_detach,
1793 .suspend = pmz_suspend,
1794 .resume = pmz_resume,
1799 static struct platform_driver pmz_driver = {
1800 .remove = __exit_p(pmz_detach),
1806 #endif /* !CONFIG_PPC_PMAC */
1808 static int __init init_pmz(void)
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()
1819 if (pmz_ports_count == 0)
1823 * Bail early if no port found
1825 if (pmz_ports_count == 0)
1829 * Now we register with the serial layer
1831 rc = pmz_register();
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]);
1843 * Then we register the macio driver itself
1845 #ifdef CONFIG_PPC_PMAC
1846 return macio_register_driver(&pmz_driver);
1848 return platform_driver_probe(&pmz_driver, pmz_attach);
1852 static void __exit exit_pmz(void)
1856 #ifdef CONFIG_PPC_PMAC
1857 /* Get rid of macio-driver (detach from macio) */
1858 macio_unregister_driver(&pmz_driver);
1860 platform_driver_unregister(&pmz_driver);
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);
1869 if (uport->pdev != NULL)
1870 pmz_dispose_port(uport);
1873 /* Unregister UART driver */
1874 uart_unregister_driver(&pmz_uart_reg);
1877 #ifdef CONFIG_SERIAL_PMACZILOG_CONSOLE
1879 static void pmz_console_putchar(struct uart_port *port, unsigned char ch)
1881 struct uart_pmac_port *uap =
1882 container_of(port, struct uart_pmac_port, port);
1884 /* Wait for the transmit buffer to empty. */
1885 while ((read_zsreg(uap, R0) & Tx_BUF_EMP) == 0)
1887 write_zsdata(uap, ch);
1891 * Print a string to the serial port trying not to disturb
1892 * any possible real use of the port...
1894 static void pmz_console_write(struct console *con, const char *s, unsigned int count)
1896 struct uart_pmac_port *uap = &pmz_ports[con->index];
1897 unsigned long flags;
1899 spin_lock_irqsave(&uap->port.lock, flags);
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);
1905 uart_console_write(&uap->port, s, count, pmz_console_putchar);
1907 /* Restore the values in the registers. */
1908 write_zsreg(uap, R1, uap->curregs[1]);
1909 /* Don't disable the transmitter. */
1911 spin_unlock_irqrestore(&uap->port.lock, flags);
1915 * Setup the serial console
1917 static int __init pmz_console_setup(struct console *co, char *options)
1919 struct uart_pmac_port *uap;
1920 struct uart_port *port;
1925 unsigned long pwr_delay;
1928 * XServe's default to 57600 bps
1930 if (of_machine_is_compatible("RackMac1,1")
1931 || of_machine_is_compatible("RackMac1,2")
1932 || of_machine_is_compatible("MacRISC4"))
1936 * Check whether an invalid uart number has been specified, and
1937 * if so, search for the first available port that does have
1940 if (co->index >= pmz_ports_count)
1942 uap = &pmz_ports[co->index];
1943 #ifdef CONFIG_PPC_PMAC
1944 if (uap->node == NULL)
1947 if (uap->pdev == NULL)
1953 * Mark port as beeing a console
1955 uap->flags |= PMACZILOG_FLAG_IS_CONS;
1958 * Temporary fix for uart layer who didn't setup the spinlock yet
1960 spin_lock_init(&port->lock);
1963 * Enable the hardware
1965 pwr_delay = __pmz_startup(uap);
1970 uart_parse_options(options, &baud, &parity, &bits, &flow);
1972 return uart_set_options(port, co, baud, parity, bits, flow);
1975 static int __init pmz_console_init(void)
1980 if (pmz_ports_count == 0)
1983 /* TODO: Autoprobe console based on OF */
1984 /* pmz_console.index = i; */
1985 register_console(&pmz_console);
1990 console_initcall(pmz_console_init);
1991 #endif /* CONFIG_SERIAL_PMACZILOG_CONSOLE */
1993 module_init(init_pmz);
1994 module_exit(exit_pmz);