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
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...
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
28 #undef USE_CTRL_O_SYSRQ
30 #include <linux/module.h>
31 #include <linux/tty.h>
33 #include <linux/tty_flip.h>
34 #include <linux/major.h>
35 #include <linux/string.h>
36 #include <linux/fcntl.h>
38 #include <linux/kernel.h>
39 #include <linux/delay.h>
40 #include <linux/init.h>
41 #include <linux/console.h>
42 #include <linux/adb.h>
43 #include <linux/pmu.h>
44 #include <linux/bitops.h>
45 #include <linux/sysrq.h>
46 #include <linux/mutex.h>
47 #include <linux/of_address.h>
48 #include <linux/of_irq.h>
49 #include <asm/sections.h>
53 #ifdef CONFIG_PPC_PMAC
55 #include <asm/machdep.h>
56 #include <asm/pmac_feature.h>
57 #include <asm/dbdma.h>
58 #include <asm/macio.h>
60 #include <linux/platform_device.h>
61 #define of_machine_is_compatible(x) (0)
64 #include <linux/serial.h>
65 #include <linux/serial_core.h>
67 #include "pmac_zilog.h"
69 /* Not yet implemented */
72 static char version[] __initdata = "pmac_zilog: 0.6 (Benjamin Herrenschmidt <
[email protected]>)";
74 MODULE_DESCRIPTION("Driver for the Mac and PowerMac serial ports.");
75 MODULE_LICENSE("GPL");
77 #ifdef CONFIG_SERIAL_PMACZILOG_TTYS
78 #define PMACZILOG_MAJOR TTY_MAJOR
79 #define PMACZILOG_MINOR 64
80 #define PMACZILOG_NAME "ttyS"
82 #define PMACZILOG_MAJOR 204
83 #define PMACZILOG_MINOR 192
84 #define PMACZILOG_NAME "ttyPZ"
87 #define pmz_debug(fmt, arg...) pr_debug("ttyPZ%d: " fmt, uap->port.line, ## arg)
88 #define pmz_error(fmt, arg...) pr_err("ttyPZ%d: " fmt, uap->port.line, ## arg)
89 #define pmz_info(fmt, arg...) pr_info("ttyPZ%d: " fmt, uap->port.line, ## arg)
92 * For the sake of early serial console, we can do a pre-probe
93 * (optional) of the ports at rather early boot time.
95 static struct uart_pmac_port pmz_ports[MAX_ZS_PORTS];
96 static int pmz_ports_count;
98 static struct uart_driver pmz_uart_reg = {
100 .driver_name = PMACZILOG_NAME,
101 .dev_name = PMACZILOG_NAME,
102 .major = PMACZILOG_MAJOR,
103 .minor = PMACZILOG_MINOR,
108 * Load all registers to reprogram the port
109 * This function must only be called when the TX is not busy. The UART
110 * port lock must be held and local interrupts disabled.
112 static void pmz_load_zsregs(struct uart_pmac_port *uap, u8 *regs)
116 /* Let pending transmits finish. */
117 for (i = 0; i < 1000; i++) {
118 unsigned char stat = read_zsreg(uap, R1);
130 /* Disable all interrupts. */
132 regs[R1] & ~(RxINT_MASK | TxINT_ENAB | EXT_INT_ENAB));
134 /* Set parity, sync config, stop bits, and clock divisor. */
135 write_zsreg(uap, R4, regs[R4]);
137 /* Set misc. TX/RX control bits. */
138 write_zsreg(uap, R10, regs[R10]);
140 /* Set TX/RX controls sans the enable bits. */
141 write_zsreg(uap, R3, regs[R3] & ~RxENABLE);
142 write_zsreg(uap, R5, regs[R5] & ~TxENABLE);
144 /* now set R7 "prime" on ESCC */
145 write_zsreg(uap, R15, regs[R15] | EN85C30);
146 write_zsreg(uap, R7, regs[R7P]);
148 /* make sure we use R7 "non-prime" on ESCC */
149 write_zsreg(uap, R15, regs[R15] & ~EN85C30);
151 /* Synchronous mode config. */
152 write_zsreg(uap, R6, regs[R6]);
153 write_zsreg(uap, R7, regs[R7]);
155 /* Disable baud generator. */
156 write_zsreg(uap, R14, regs[R14] & ~BRENAB);
158 /* Clock mode control. */
159 write_zsreg(uap, R11, regs[R11]);
161 /* Lower and upper byte of baud rate generator divisor. */
162 write_zsreg(uap, R12, regs[R12]);
163 write_zsreg(uap, R13, regs[R13]);
165 /* Now rewrite R14, with BRENAB (if set). */
166 write_zsreg(uap, R14, regs[R14]);
168 /* Reset external status interrupts. */
169 write_zsreg(uap, R0, RES_EXT_INT);
170 write_zsreg(uap, R0, RES_EXT_INT);
172 /* Rewrite R3/R5, this time without enables masked. */
173 write_zsreg(uap, R3, regs[R3]);
174 write_zsreg(uap, R5, regs[R5]);
176 /* Rewrite R1, this time without IRQ enabled masked. */
177 write_zsreg(uap, R1, regs[R1]);
179 /* Enable interrupts */
180 write_zsreg(uap, R9, regs[R9]);
184 * We do like sunzilog to avoid disrupting pending Tx
185 * Reprogram the Zilog channel HW registers with the copies found in the
186 * software state struct. If the transmitter is busy, we defer this update
187 * until the next TX complete interrupt. Else, we do it right now.
189 * The UART port lock must be held and local interrupts disabled.
191 static void pmz_maybe_update_regs(struct uart_pmac_port *uap)
193 if (!ZS_REGS_HELD(uap)) {
194 if (ZS_TX_ACTIVE(uap)) {
195 uap->flags |= PMACZILOG_FLAG_REGS_HELD;
197 pmz_debug("pmz: maybe_update_regs: updating\n");
198 pmz_load_zsregs(uap, uap->curregs);
203 static void pmz_interrupt_control(struct uart_pmac_port *uap, int enable)
206 uap->curregs[1] |= INT_ALL_Rx | TxINT_ENAB;
207 if (!ZS_IS_EXTCLK(uap))
208 uap->curregs[1] |= EXT_INT_ENAB;
210 uap->curregs[1] &= ~(EXT_INT_ENAB | TxINT_ENAB | RxINT_MASK);
212 write_zsreg(uap, R1, uap->curregs[1]);
215 static bool pmz_receive_chars(struct uart_pmac_port *uap)
216 __must_hold(&uap->port.lock)
218 struct tty_port *port;
219 unsigned char ch, r1, drop, flag;
222 /* Sanity check, make sure the old bug is no longer happening */
223 if (uap->port.state == NULL) {
225 (void)read_zsdata(uap);
228 port = &uap->port.state->port;
233 r1 = read_zsreg(uap, R1);
234 ch = read_zsdata(uap);
236 if (r1 & (PAR_ERR | Rx_OVR | CRC_ERR)) {
237 write_zsreg(uap, R0, ERR_RES);
241 ch &= uap->parity_mask;
242 if (ch == 0 && uap->flags & PMACZILOG_FLAG_BREAK) {
243 uap->flags &= ~PMACZILOG_FLAG_BREAK;
246 #if defined(CONFIG_MAGIC_SYSRQ) && defined(CONFIG_SERIAL_CORE_CONSOLE)
247 #ifdef USE_CTRL_O_SYSRQ
248 /* Handle the SysRq ^O Hack */
250 uap->port.sysrq = jiffies + HZ*5;
253 #endif /* USE_CTRL_O_SYSRQ */
254 if (uap->port.sysrq) {
256 spin_unlock(&uap->port.lock);
257 swallow = uart_handle_sysrq_char(&uap->port, ch);
258 spin_lock(&uap->port.lock);
262 #endif /* CONFIG_MAGIC_SYSRQ && CONFIG_SERIAL_CORE_CONSOLE */
264 /* A real serial line, record the character and status. */
269 uap->port.icount.rx++;
271 if (r1 & (PAR_ERR | Rx_OVR | CRC_ERR | BRK_ABRT)) {
273 pmz_debug("pmz: got break !\n");
274 r1 &= ~(PAR_ERR | CRC_ERR);
275 uap->port.icount.brk++;
276 if (uart_handle_break(&uap->port))
279 else if (r1 & PAR_ERR)
280 uap->port.icount.parity++;
281 else if (r1 & CRC_ERR)
282 uap->port.icount.frame++;
284 uap->port.icount.overrun++;
285 r1 &= uap->port.read_status_mask;
288 else if (r1 & PAR_ERR)
290 else if (r1 & CRC_ERR)
294 if (uap->port.ignore_status_mask == 0xff ||
295 (r1 & uap->port.ignore_status_mask) == 0) {
296 tty_insert_flip_char(port, ch, flag);
299 tty_insert_flip_char(port, 0, TTY_OVERRUN);
301 /* We can get stuck in an infinite loop getting char 0 when the
302 * line is in a wrong HW state, we break that here.
303 * When that happens, I disable the receive side of the driver.
304 * Note that what I've been experiencing is a real irq loop where
305 * I'm getting flooded regardless of the actual port speed.
306 * Something strange is going on with the HW
308 if ((++loops) > 1000)
310 ch = read_zsreg(uap, R0);
311 if (!(ch & Rx_CH_AV))
317 pmz_interrupt_control(uap, 0);
318 pmz_error("pmz: rx irq flood !\n");
322 static void pmz_status_handle(struct uart_pmac_port *uap)
324 unsigned char status;
326 status = read_zsreg(uap, R0);
327 write_zsreg(uap, R0, RES_EXT_INT);
330 if (ZS_IS_OPEN(uap) && ZS_WANTS_MODEM_STATUS(uap)) {
331 if (status & SYNC_HUNT)
332 uap->port.icount.dsr++;
334 /* The Zilog just gives us an interrupt when DCD/CTS/etc. change.
335 * But it does not tell us which bit has changed, we have to keep
336 * track of this ourselves.
337 * The CTS input is inverted for some reason. -- paulus
339 if ((status ^ uap->prev_status) & DCD)
340 uart_handle_dcd_change(&uap->port,
342 if ((status ^ uap->prev_status) & CTS)
343 uart_handle_cts_change(&uap->port,
346 wake_up_interruptible(&uap->port.state->port.delta_msr_wait);
349 if (status & BRK_ABRT)
350 uap->flags |= PMACZILOG_FLAG_BREAK;
352 uap->prev_status = status;
355 static void pmz_transmit_chars(struct uart_pmac_port *uap)
357 struct circ_buf *xmit;
359 if (ZS_IS_CONS(uap)) {
360 unsigned char status = read_zsreg(uap, R0);
362 /* TX still busy? Just wait for the next TX done interrupt.
364 * It can occur because of how we do serial console writes. It would
365 * be nice to transmit console writes just like we normally would for
366 * a TTY line. (ie. buffered and TX interrupt driven). That is not
367 * easy because console writes cannot sleep. One solution might be
368 * to poll on enough port->xmit space becoming free. -DaveM
370 if (!(status & Tx_BUF_EMP))
374 uap->flags &= ~PMACZILOG_FLAG_TX_ACTIVE;
376 if (ZS_REGS_HELD(uap)) {
377 pmz_load_zsregs(uap, uap->curregs);
378 uap->flags &= ~PMACZILOG_FLAG_REGS_HELD;
381 if (ZS_TX_STOPPED(uap)) {
382 uap->flags &= ~PMACZILOG_FLAG_TX_STOPPED;
386 /* Under some circumstances, we see interrupts reported for
387 * a closed channel. The interrupt mask in R1 is clear, but
388 * R3 still signals the interrupts and we see them when taking
389 * an interrupt for the other channel (this could be a qemu
390 * bug but since the ESCC doc doesn't specify precsiely whether
391 * R3 interrup status bits are masked by R1 interrupt enable
392 * bits, better safe than sorry). --BenH.
394 if (!ZS_IS_OPEN(uap))
397 if (uap->port.x_char) {
398 uap->flags |= PMACZILOG_FLAG_TX_ACTIVE;
399 write_zsdata(uap, uap->port.x_char);
401 uap->port.icount.tx++;
402 uap->port.x_char = 0;
406 if (uap->port.state == NULL)
408 xmit = &uap->port.state->xmit;
409 if (uart_circ_empty(xmit)) {
410 uart_write_wakeup(&uap->port);
413 if (uart_tx_stopped(&uap->port))
416 uap->flags |= PMACZILOG_FLAG_TX_ACTIVE;
417 write_zsdata(uap, xmit->buf[xmit->tail]);
420 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
421 uap->port.icount.tx++;
423 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
424 uart_write_wakeup(&uap->port);
429 write_zsreg(uap, R0, RES_Tx_P);
433 /* Hrm... we register that twice, fixme later.... */
434 static irqreturn_t pmz_interrupt(int irq, void *dev_id)
436 struct uart_pmac_port *uap = dev_id;
437 struct uart_pmac_port *uap_a;
438 struct uart_pmac_port *uap_b;
443 uap_a = pmz_get_port_A(uap);
446 spin_lock(&uap_a->port.lock);
447 r3 = read_zsreg(uap_a, R3);
450 pmz_debug("irq, r3: %x\n", r3);
454 if (r3 & (CHAEXT | CHATxIP | CHARxIP)) {
455 if (!ZS_IS_OPEN(uap_a)) {
456 pmz_debug("ChanA interrupt while not open !\n");
459 write_zsreg(uap_a, R0, RES_H_IUS);
462 pmz_status_handle(uap_a);
464 push = pmz_receive_chars(uap_a);
466 pmz_transmit_chars(uap_a);
470 spin_unlock(&uap_a->port.lock);
472 tty_flip_buffer_push(&uap->port.state->port);
477 spin_lock(&uap_b->port.lock);
479 if (r3 & (CHBEXT | CHBTxIP | CHBRxIP)) {
480 if (!ZS_IS_OPEN(uap_b)) {
481 pmz_debug("ChanB interrupt while not open !\n");
484 write_zsreg(uap_b, R0, RES_H_IUS);
487 pmz_status_handle(uap_b);
489 push = pmz_receive_chars(uap_b);
491 pmz_transmit_chars(uap_b);
495 spin_unlock(&uap_b->port.lock);
497 tty_flip_buffer_push(&uap->port.state->port);
504 * Peek the status register, lock not held by caller
506 static inline u8 pmz_peek_status(struct uart_pmac_port *uap)
511 spin_lock_irqsave(&uap->port.lock, flags);
512 status = read_zsreg(uap, R0);
513 spin_unlock_irqrestore(&uap->port.lock, flags);
519 * Check if transmitter is empty
520 * The port lock is not held.
522 static unsigned int pmz_tx_empty(struct uart_port *port)
524 unsigned char status;
526 status = pmz_peek_status(to_pmz(port));
527 if (status & Tx_BUF_EMP)
533 * Set Modem Control (RTS & DTR) bits
534 * The port lock is held and interrupts are disabled.
535 * Note: Shall we really filter out RTS on external ports or
536 * should that be dealt at higher level only ?
538 static void pmz_set_mctrl(struct uart_port *port, unsigned int mctrl)
540 struct uart_pmac_port *uap = to_pmz(port);
541 unsigned char set_bits, clear_bits;
543 /* Do nothing for irda for now... */
546 /* We get called during boot with a port not up yet */
547 if (!(ZS_IS_OPEN(uap) || ZS_IS_CONS(uap)))
550 set_bits = clear_bits = 0;
552 if (ZS_IS_INTMODEM(uap)) {
553 if (mctrl & TIOCM_RTS)
558 if (mctrl & TIOCM_DTR)
563 /* NOTE: Not subject to 'transmitter active' rule. */
564 uap->curregs[R5] |= set_bits;
565 uap->curregs[R5] &= ~clear_bits;
567 write_zsreg(uap, R5, uap->curregs[R5]);
568 pmz_debug("pmz_set_mctrl: set bits: %x, clear bits: %x -> %x\n",
569 set_bits, clear_bits, uap->curregs[R5]);
574 * Get Modem Control bits (only the input ones, the core will
575 * or that with a cached value of the control ones)
576 * The port lock is held and interrupts are disabled.
578 static unsigned int pmz_get_mctrl(struct uart_port *port)
580 struct uart_pmac_port *uap = to_pmz(port);
581 unsigned char status;
584 status = read_zsreg(uap, R0);
589 if (status & SYNC_HUNT)
598 * Stop TX side. Dealt like sunzilog at next Tx interrupt,
599 * though for DMA, we will have to do a bit more.
600 * The port lock is held and interrupts are disabled.
602 static void pmz_stop_tx(struct uart_port *port)
604 to_pmz(port)->flags |= PMACZILOG_FLAG_TX_STOPPED;
609 * The port lock is held and interrupts are disabled.
611 static void pmz_start_tx(struct uart_port *port)
613 struct uart_pmac_port *uap = to_pmz(port);
614 unsigned char status;
616 pmz_debug("pmz: start_tx()\n");
618 uap->flags |= PMACZILOG_FLAG_TX_ACTIVE;
619 uap->flags &= ~PMACZILOG_FLAG_TX_STOPPED;
621 status = read_zsreg(uap, R0);
623 /* TX busy? Just wait for the TX done interrupt. */
624 if (!(status & Tx_BUF_EMP))
627 /* Send the first character to jump-start the TX done
628 * IRQ sending engine.
631 write_zsdata(uap, port->x_char);
636 struct circ_buf *xmit = &port->state->xmit;
638 if (uart_circ_empty(xmit))
640 write_zsdata(uap, xmit->buf[xmit->tail]);
642 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
645 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
646 uart_write_wakeup(&uap->port);
649 pmz_debug("pmz: start_tx() done.\n");
653 * Stop Rx side, basically disable emitting of
654 * Rx interrupts on the port. We don't disable the rx
655 * side of the chip proper though
656 * The port lock is held.
658 static void pmz_stop_rx(struct uart_port *port)
660 struct uart_pmac_port *uap = to_pmz(port);
662 pmz_debug("pmz: stop_rx()()\n");
664 /* Disable all RX interrupts. */
665 uap->curregs[R1] &= ~RxINT_MASK;
666 pmz_maybe_update_regs(uap);
668 pmz_debug("pmz: stop_rx() done.\n");
672 * Enable modem status change interrupts
673 * The port lock is held.
675 static void pmz_enable_ms(struct uart_port *port)
677 struct uart_pmac_port *uap = to_pmz(port);
678 unsigned char new_reg;
682 new_reg = uap->curregs[R15] | (DCDIE | SYNCIE | CTSIE);
683 if (new_reg != uap->curregs[R15]) {
684 uap->curregs[R15] = new_reg;
686 /* NOTE: Not subject to 'transmitter active' rule. */
687 write_zsreg(uap, R15, uap->curregs[R15]);
692 * Control break state emission
693 * The port lock is not held.
695 static void pmz_break_ctl(struct uart_port *port, int break_state)
697 struct uart_pmac_port *uap = to_pmz(port);
698 unsigned char set_bits, clear_bits, new_reg;
701 set_bits = clear_bits = 0;
706 clear_bits |= SND_BRK;
708 spin_lock_irqsave(&port->lock, flags);
710 new_reg = (uap->curregs[R5] | set_bits) & ~clear_bits;
711 if (new_reg != uap->curregs[R5]) {
712 uap->curregs[R5] = new_reg;
713 write_zsreg(uap, R5, uap->curregs[R5]);
716 spin_unlock_irqrestore(&port->lock, flags);
719 #ifdef CONFIG_PPC_PMAC
722 * Turn power on or off to the SCC and associated stuff
723 * (port drivers, modem, IR port, etc.)
724 * Returns the number of milliseconds we should wait before
725 * trying to use the port.
727 static int pmz_set_scc_power(struct uart_pmac_port *uap, int state)
733 rc = pmac_call_feature(
734 PMAC_FTR_SCC_ENABLE, uap->node, uap->port_type, 1);
735 pmz_debug("port power on result: %d\n", rc);
736 if (ZS_IS_INTMODEM(uap)) {
737 rc = pmac_call_feature(
738 PMAC_FTR_MODEM_ENABLE, uap->node, 0, 1);
739 delay = 2500; /* wait for 2.5s before using */
740 pmz_debug("modem power result: %d\n", rc);
743 /* TODO: Make that depend on a timer, don't power down
746 if (ZS_IS_INTMODEM(uap)) {
747 rc = pmac_call_feature(
748 PMAC_FTR_MODEM_ENABLE, uap->node, 0, 0);
749 pmz_debug("port power off result: %d\n", rc);
751 pmac_call_feature(PMAC_FTR_SCC_ENABLE, uap->node, uap->port_type, 0);
758 static int pmz_set_scc_power(struct uart_pmac_port *uap, int state)
763 #endif /* !CONFIG_PPC_PMAC */
766 * FixZeroBug....Works around a bug in the SCC receiving channel.
767 * Inspired from Darwin code, 15 Sept. 2000 -DanM
769 * The following sequence prevents a problem that is seen with O'Hare ASICs
770 * (most versions -- also with some Heathrow and Hydra ASICs) where a zero
771 * at the input to the receiver becomes 'stuck' and locks up the receiver.
772 * This problem can occur as a result of a zero bit at the receiver input
773 * coincident with any of the following events:
775 * The SCC is initialized (hardware or software).
776 * A framing error is detected.
777 * The clocking option changes from synchronous or X1 asynchronous
778 * clocking to X16, X32, or X64 asynchronous clocking.
779 * The decoding mode is changed among NRZ, NRZI, FM0, or FM1.
781 * This workaround attempts to recover from the lockup condition by placing
782 * the SCC in synchronous loopback mode with a fast clock before programming
783 * any of the asynchronous modes.
785 static void pmz_fix_zero_bug_scc(struct uart_pmac_port *uap)
787 write_zsreg(uap, 9, ZS_IS_CHANNEL_A(uap) ? CHRA : CHRB);
790 write_zsreg(uap, 9, (ZS_IS_CHANNEL_A(uap) ? CHRA : CHRB) | NV);
793 write_zsreg(uap, 4, X1CLK | MONSYNC);
794 write_zsreg(uap, 3, Rx8);
795 write_zsreg(uap, 5, Tx8 | RTS);
796 write_zsreg(uap, 9, NV); /* Didn't we already do this? */
797 write_zsreg(uap, 11, RCBR | TCBR);
798 write_zsreg(uap, 12, 0);
799 write_zsreg(uap, 13, 0);
800 write_zsreg(uap, 14, (LOOPBAK | BRSRC));
801 write_zsreg(uap, 14, (LOOPBAK | BRSRC | BRENAB));
802 write_zsreg(uap, 3, Rx8 | RxENABLE);
803 write_zsreg(uap, 0, RES_EXT_INT);
804 write_zsreg(uap, 0, RES_EXT_INT);
805 write_zsreg(uap, 0, RES_EXT_INT); /* to kill some time */
807 /* The channel should be OK now, but it is probably receiving
809 * Switch to asynchronous mode, disable the receiver,
810 * and discard everything in the receive buffer.
812 write_zsreg(uap, 9, NV);
813 write_zsreg(uap, 4, X16CLK | SB_MASK);
814 write_zsreg(uap, 3, Rx8);
816 while (read_zsreg(uap, 0) & Rx_CH_AV) {
817 (void)read_zsreg(uap, 8);
818 write_zsreg(uap, 0, RES_EXT_INT);
819 write_zsreg(uap, 0, ERR_RES);
824 * Real startup routine, powers up the hardware and sets up
825 * the SCC. Returns a delay in ms where you need to wait before
826 * actually using the port, this is typically the internal modem
827 * powerup delay. This routine expect the lock to be taken.
829 static int __pmz_startup(struct uart_pmac_port *uap)
833 memset(&uap->curregs, 0, sizeof(uap->curregs));
835 /* Power up the SCC & underlying hardware (modem/irda) */
836 pwr_delay = pmz_set_scc_power(uap, 1);
838 /* Nice buggy HW ... */
839 pmz_fix_zero_bug_scc(uap);
841 /* Reset the channel */
842 uap->curregs[R9] = 0;
843 write_zsreg(uap, 9, ZS_IS_CHANNEL_A(uap) ? CHRA : CHRB);
846 write_zsreg(uap, 9, 0);
849 /* Clear the interrupt registers */
850 write_zsreg(uap, R1, 0);
851 write_zsreg(uap, R0, ERR_RES);
852 write_zsreg(uap, R0, ERR_RES);
853 write_zsreg(uap, R0, RES_H_IUS);
854 write_zsreg(uap, R0, RES_H_IUS);
856 /* Setup some valid baud rate */
857 uap->curregs[R4] = X16CLK | SB1;
858 uap->curregs[R3] = Rx8;
859 uap->curregs[R5] = Tx8 | RTS;
860 if (!ZS_IS_IRDA(uap))
861 uap->curregs[R5] |= DTR;
862 uap->curregs[R12] = 0;
863 uap->curregs[R13] = 0;
864 uap->curregs[R14] = BRENAB;
866 /* Clear handshaking, enable BREAK interrupts */
867 uap->curregs[R15] = BRKIE;
869 /* Master interrupt enable */
870 uap->curregs[R9] |= NV | MIE;
872 pmz_load_zsregs(uap, uap->curregs);
874 /* Enable receiver and transmitter. */
875 write_zsreg(uap, R3, uap->curregs[R3] |= RxENABLE);
876 write_zsreg(uap, R5, uap->curregs[R5] |= TxENABLE);
878 /* Remember status for DCD/CTS changes */
879 uap->prev_status = read_zsreg(uap, R0);
884 static void pmz_irda_reset(struct uart_pmac_port *uap)
888 spin_lock_irqsave(&uap->port.lock, flags);
889 uap->curregs[R5] |= DTR;
890 write_zsreg(uap, R5, uap->curregs[R5]);
892 spin_unlock_irqrestore(&uap->port.lock, flags);
895 spin_lock_irqsave(&uap->port.lock, flags);
896 uap->curregs[R5] &= ~DTR;
897 write_zsreg(uap, R5, uap->curregs[R5]);
899 spin_unlock_irqrestore(&uap->port.lock, flags);
904 * This is the "normal" startup routine, using the above one
905 * wrapped with the lock and doing a schedule delay
907 static int pmz_startup(struct uart_port *port)
909 struct uart_pmac_port *uap = to_pmz(port);
913 pmz_debug("pmz: startup()\n");
915 uap->flags |= PMACZILOG_FLAG_IS_OPEN;
917 /* A console is never powered down. Else, power up and
918 * initialize the chip
920 if (!ZS_IS_CONS(uap)) {
921 spin_lock_irqsave(&port->lock, flags);
922 pwr_delay = __pmz_startup(uap);
923 spin_unlock_irqrestore(&port->lock, flags);
925 sprintf(uap->irq_name, PMACZILOG_NAME"%d", uap->port.line);
926 if (request_irq(uap->port.irq, pmz_interrupt, IRQF_SHARED,
927 uap->irq_name, uap)) {
928 pmz_error("Unable to register zs interrupt handler.\n");
929 pmz_set_scc_power(uap, 0);
933 /* Right now, we deal with delay by blocking here, I'll be
936 if (pwr_delay != 0) {
937 pmz_debug("pmz: delaying %d ms\n", pwr_delay);
941 /* IrDA reset is done now */
945 /* Enable interrupt requests for the channel */
946 spin_lock_irqsave(&port->lock, flags);
947 pmz_interrupt_control(uap, 1);
948 spin_unlock_irqrestore(&port->lock, flags);
950 pmz_debug("pmz: startup() done.\n");
955 static void pmz_shutdown(struct uart_port *port)
957 struct uart_pmac_port *uap = to_pmz(port);
960 pmz_debug("pmz: shutdown()\n");
962 spin_lock_irqsave(&port->lock, flags);
964 /* Disable interrupt requests for the channel */
965 pmz_interrupt_control(uap, 0);
967 if (!ZS_IS_CONS(uap)) {
968 /* Disable receiver and transmitter */
969 uap->curregs[R3] &= ~RxENABLE;
970 uap->curregs[R5] &= ~TxENABLE;
972 /* Disable break assertion */
973 uap->curregs[R5] &= ~SND_BRK;
974 pmz_maybe_update_regs(uap);
977 spin_unlock_irqrestore(&port->lock, flags);
979 /* Release interrupt handler */
980 free_irq(uap->port.irq, uap);
982 spin_lock_irqsave(&port->lock, flags);
984 uap->flags &= ~PMACZILOG_FLAG_IS_OPEN;
986 if (!ZS_IS_CONS(uap))
987 pmz_set_scc_power(uap, 0); /* Shut the chip down */
989 spin_unlock_irqrestore(&port->lock, flags);
991 pmz_debug("pmz: shutdown() done.\n");
994 /* Shared by TTY driver and serial console setup. The port lock is held
995 * and local interrupts are disabled.
997 static void pmz_convert_to_zs(struct uart_pmac_port *uap, unsigned int cflag,
998 unsigned int iflag, unsigned long baud)
1002 /* Switch to external clocking for IrDA high clock rates. That
1003 * code could be re-used for Midi interfaces with different
1006 if (baud >= 115200 && ZS_IS_IRDA(uap)) {
1007 uap->curregs[R4] = X1CLK;
1008 uap->curregs[R11] = RCTRxCP | TCTRxCP;
1009 uap->curregs[R14] = 0; /* BRG off */
1010 uap->curregs[R12] = 0;
1011 uap->curregs[R13] = 0;
1012 uap->flags |= PMACZILOG_FLAG_IS_EXTCLK;
1015 case ZS_CLOCK/16: /* 230400 */
1016 uap->curregs[R4] = X16CLK;
1017 uap->curregs[R11] = 0;
1018 uap->curregs[R14] = 0;
1020 case ZS_CLOCK/32: /* 115200 */
1021 uap->curregs[R4] = X32CLK;
1022 uap->curregs[R11] = 0;
1023 uap->curregs[R14] = 0;
1026 uap->curregs[R4] = X16CLK;
1027 uap->curregs[R11] = TCBR | RCBR;
1028 brg = BPS_TO_BRG(baud, ZS_CLOCK / 16);
1029 uap->curregs[R12] = (brg & 255);
1030 uap->curregs[R13] = ((brg >> 8) & 255);
1031 uap->curregs[R14] = BRENAB;
1033 uap->flags &= ~PMACZILOG_FLAG_IS_EXTCLK;
1036 /* Character size, stop bits, and parity. */
1037 uap->curregs[3] &= ~RxN_MASK;
1038 uap->curregs[5] &= ~TxN_MASK;
1040 switch (cflag & CSIZE) {
1042 uap->curregs[3] |= Rx5;
1043 uap->curregs[5] |= Tx5;
1044 uap->parity_mask = 0x1f;
1047 uap->curregs[3] |= Rx6;
1048 uap->curregs[5] |= Tx6;
1049 uap->parity_mask = 0x3f;
1052 uap->curregs[3] |= Rx7;
1053 uap->curregs[5] |= Tx7;
1054 uap->parity_mask = 0x7f;
1058 uap->curregs[3] |= Rx8;
1059 uap->curregs[5] |= Tx8;
1060 uap->parity_mask = 0xff;
1063 uap->curregs[4] &= ~(SB_MASK);
1065 uap->curregs[4] |= SB2;
1067 uap->curregs[4] |= SB1;
1069 uap->curregs[4] |= PAR_ENAB;
1071 uap->curregs[4] &= ~PAR_ENAB;
1072 if (!(cflag & PARODD))
1073 uap->curregs[4] |= PAR_EVEN;
1075 uap->curregs[4] &= ~PAR_EVEN;
1077 uap->port.read_status_mask = Rx_OVR;
1079 uap->port.read_status_mask |= CRC_ERR | PAR_ERR;
1080 if (iflag & (IGNBRK | BRKINT | PARMRK))
1081 uap->port.read_status_mask |= BRK_ABRT;
1083 uap->port.ignore_status_mask = 0;
1085 uap->port.ignore_status_mask |= CRC_ERR | PAR_ERR;
1086 if (iflag & IGNBRK) {
1087 uap->port.ignore_status_mask |= BRK_ABRT;
1089 uap->port.ignore_status_mask |= Rx_OVR;
1092 if ((cflag & CREAD) == 0)
1093 uap->port.ignore_status_mask = 0xff;
1098 * Set the irda codec on the imac to the specified baud rate.
1100 static void pmz_irda_setup(struct uart_pmac_port *uap, unsigned long *baud)
1128 /* The FIR modes aren't really supported at this point, how
1129 * do we select the speed ? via the FCR on KeyLargo ?
1143 /* Wait for transmitter to drain */
1145 while ((read_zsreg(uap, R0) & Tx_BUF_EMP) == 0
1146 || (read_zsreg(uap, R1) & ALL_SNT) == 0) {
1148 pmz_error("transmitter didn't drain\n");
1154 /* Drain the receiver too */
1156 (void)read_zsdata(uap);
1157 (void)read_zsdata(uap);
1158 (void)read_zsdata(uap);
1160 while (read_zsreg(uap, R0) & Rx_CH_AV) {
1164 pmz_error("receiver didn't drain\n");
1169 /* Switch to command mode */
1170 uap->curregs[R5] |= DTR;
1171 write_zsreg(uap, R5, uap->curregs[R5]);
1175 /* Switch SCC to 19200 */
1176 pmz_convert_to_zs(uap, CS8, 0, 19200);
1177 pmz_load_zsregs(uap, uap->curregs);
1180 /* Write get_version command byte */
1181 write_zsdata(uap, 1);
1183 while ((read_zsreg(uap, R0) & Rx_CH_AV) == 0) {
1185 pmz_error("irda_setup timed out on get_version byte\n");
1190 version = read_zsdata(uap);
1193 pmz_info("IrDA: dongle version %d not supported\n", version);
1197 /* Send speed mode */
1198 write_zsdata(uap, cmdbyte);
1200 while ((read_zsreg(uap, R0) & Rx_CH_AV) == 0) {
1202 pmz_error("irda_setup timed out on speed mode byte\n");
1207 t = read_zsdata(uap);
1209 pmz_error("irda_setup speed mode byte = %x (%x)\n", t, cmdbyte);
1211 pmz_info("IrDA setup for %ld bps, dongle version: %d\n",
1214 (void)read_zsdata(uap);
1215 (void)read_zsdata(uap);
1216 (void)read_zsdata(uap);
1219 /* Switch back to data mode */
1220 uap->curregs[R5] &= ~DTR;
1221 write_zsreg(uap, R5, uap->curregs[R5]);
1224 (void)read_zsdata(uap);
1225 (void)read_zsdata(uap);
1226 (void)read_zsdata(uap);
1230 static void __pmz_set_termios(struct uart_port *port, struct ktermios *termios,
1231 struct ktermios *old)
1233 struct uart_pmac_port *uap = to_pmz(port);
1236 pmz_debug("pmz: set_termios()\n");
1238 memcpy(&uap->termios_cache, termios, sizeof(struct ktermios));
1240 /* XXX Check which revs of machines actually allow 1 and 4Mb speeds
1241 * on the IR dongle. Note that the IRTTY driver currently doesn't know
1242 * about the FIR mode and high speed modes. So these are unused. For
1243 * implementing proper support for these, we should probably add some
1244 * DMA as well, at least on the Rx side, which isn't a simple thing
1247 if (ZS_IS_IRDA(uap)) {
1248 /* Calc baud rate */
1249 baud = uart_get_baud_rate(port, termios, old, 1200, 4000000);
1250 pmz_debug("pmz: switch IRDA to %ld bauds\n", baud);
1251 /* Cet the irda codec to the right rate */
1252 pmz_irda_setup(uap, &baud);
1253 /* Set final baud rate */
1254 pmz_convert_to_zs(uap, termios->c_cflag, termios->c_iflag, baud);
1255 pmz_load_zsregs(uap, uap->curregs);
1258 baud = uart_get_baud_rate(port, termios, old, 1200, 230400);
1259 pmz_convert_to_zs(uap, termios->c_cflag, termios->c_iflag, baud);
1260 /* Make sure modem status interrupts are correctly configured */
1261 if (UART_ENABLE_MS(&uap->port, termios->c_cflag)) {
1262 uap->curregs[R15] |= DCDIE | SYNCIE | CTSIE;
1263 uap->flags |= PMACZILOG_FLAG_MODEM_STATUS;
1265 uap->curregs[R15] &= ~(DCDIE | SYNCIE | CTSIE);
1266 uap->flags &= ~PMACZILOG_FLAG_MODEM_STATUS;
1269 /* Load registers to the chip */
1270 pmz_maybe_update_regs(uap);
1272 uart_update_timeout(port, termios->c_cflag, baud);
1274 pmz_debug("pmz: set_termios() done.\n");
1277 /* The port lock is not held. */
1278 static void pmz_set_termios(struct uart_port *port, struct ktermios *termios,
1279 struct ktermios *old)
1281 struct uart_pmac_port *uap = to_pmz(port);
1282 unsigned long flags;
1284 spin_lock_irqsave(&port->lock, flags);
1286 /* Disable IRQs on the port */
1287 pmz_interrupt_control(uap, 0);
1289 /* Setup new port configuration */
1290 __pmz_set_termios(port, termios, old);
1292 /* Re-enable IRQs on the port */
1293 if (ZS_IS_OPEN(uap))
1294 pmz_interrupt_control(uap, 1);
1296 spin_unlock_irqrestore(&port->lock, flags);
1299 static const char *pmz_type(struct uart_port *port)
1301 struct uart_pmac_port *uap = to_pmz(port);
1303 if (ZS_IS_IRDA(uap))
1304 return "Z85c30 ESCC - Infrared port";
1305 else if (ZS_IS_INTMODEM(uap))
1306 return "Z85c30 ESCC - Internal modem";
1307 return "Z85c30 ESCC - Serial port";
1310 /* We do not request/release mappings of the registers here, this
1311 * happens at early serial probe time.
1313 static void pmz_release_port(struct uart_port *port)
1317 static int pmz_request_port(struct uart_port *port)
1322 /* These do not need to do anything interesting either. */
1323 static void pmz_config_port(struct uart_port *port, int flags)
1327 /* We do not support letting the user mess with the divisor, IRQ, etc. */
1328 static int pmz_verify_port(struct uart_port *port, struct serial_struct *ser)
1333 #ifdef CONFIG_CONSOLE_POLL
1335 static int pmz_poll_get_char(struct uart_port *port)
1337 struct uart_pmac_port *uap =
1338 container_of(port, struct uart_pmac_port, port);
1342 if ((read_zsreg(uap, R0) & Rx_CH_AV) != 0)
1343 return read_zsdata(uap);
1348 return NO_POLL_CHAR;
1351 static void pmz_poll_put_char(struct uart_port *port, unsigned char c)
1353 struct uart_pmac_port *uap =
1354 container_of(port, struct uart_pmac_port, port);
1356 /* Wait for the transmit buffer to empty. */
1357 while ((read_zsreg(uap, R0) & Tx_BUF_EMP) == 0)
1359 write_zsdata(uap, c);
1362 #endif /* CONFIG_CONSOLE_POLL */
1364 static const struct uart_ops pmz_pops = {
1365 .tx_empty = pmz_tx_empty,
1366 .set_mctrl = pmz_set_mctrl,
1367 .get_mctrl = pmz_get_mctrl,
1368 .stop_tx = pmz_stop_tx,
1369 .start_tx = pmz_start_tx,
1370 .stop_rx = pmz_stop_rx,
1371 .enable_ms = pmz_enable_ms,
1372 .break_ctl = pmz_break_ctl,
1373 .startup = pmz_startup,
1374 .shutdown = pmz_shutdown,
1375 .set_termios = pmz_set_termios,
1377 .release_port = pmz_release_port,
1378 .request_port = pmz_request_port,
1379 .config_port = pmz_config_port,
1380 .verify_port = pmz_verify_port,
1381 #ifdef CONFIG_CONSOLE_POLL
1382 .poll_get_char = pmz_poll_get_char,
1383 .poll_put_char = pmz_poll_put_char,
1387 #ifdef CONFIG_PPC_PMAC
1390 * Setup one port structure after probing, HW is down at this point,
1391 * Unlike sunzilog, we don't need to pre-init the spinlock as we don't
1392 * register our console before uart_add_one_port() is called
1394 static int __init pmz_init_port(struct uart_pmac_port *uap)
1396 struct device_node *np = uap->node;
1398 const struct slot_names_prop {
1403 struct resource r_ports, r_rxdma, r_txdma;
1406 * Request & map chip registers
1408 if (of_address_to_resource(np, 0, &r_ports))
1410 uap->port.mapbase = r_ports.start;
1411 uap->port.membase = ioremap(uap->port.mapbase, 0x1000);
1413 uap->control_reg = uap->port.membase;
1414 uap->data_reg = uap->control_reg + 0x10;
1417 * Request & map DBDMA registers
1420 if (of_address_to_resource(np, 1, &r_txdma) == 0 &&
1421 of_address_to_resource(np, 2, &r_rxdma) == 0)
1422 uap->flags |= PMACZILOG_FLAG_HAS_DMA;
1424 memset(&r_txdma, 0, sizeof(struct resource));
1425 memset(&r_rxdma, 0, sizeof(struct resource));
1427 if (ZS_HAS_DMA(uap)) {
1428 uap->tx_dma_regs = ioremap(r_txdma.start, 0x100);
1429 if (uap->tx_dma_regs == NULL) {
1430 uap->flags &= ~PMACZILOG_FLAG_HAS_DMA;
1433 uap->rx_dma_regs = ioremap(r_rxdma.start, 0x100);
1434 if (uap->rx_dma_regs == NULL) {
1435 iounmap(uap->tx_dma_regs);
1436 uap->tx_dma_regs = NULL;
1437 uap->flags &= ~PMACZILOG_FLAG_HAS_DMA;
1440 uap->tx_dma_irq = irq_of_parse_and_map(np, 1);
1441 uap->rx_dma_irq = irq_of_parse_and_map(np, 2);
1448 if (of_device_is_compatible(np, "cobalt"))
1449 uap->flags |= PMACZILOG_FLAG_IS_INTMODEM;
1450 conn = of_get_property(np, "AAPL,connector", &len);
1451 if (conn && (strcmp(conn, "infrared") == 0))
1452 uap->flags |= PMACZILOG_FLAG_IS_IRDA;
1453 uap->port_type = PMAC_SCC_ASYNC;
1454 /* 1999 Powerbook G3 has slot-names property instead */
1455 slots = of_get_property(np, "slot-names", &len);
1456 if (slots && slots->count > 0) {
1457 if (strcmp(slots->name, "IrDA") == 0)
1458 uap->flags |= PMACZILOG_FLAG_IS_IRDA;
1459 else if (strcmp(slots->name, "Modem") == 0)
1460 uap->flags |= PMACZILOG_FLAG_IS_INTMODEM;
1462 if (ZS_IS_IRDA(uap))
1463 uap->port_type = PMAC_SCC_IRDA;
1464 if (ZS_IS_INTMODEM(uap)) {
1465 struct device_node* i2c_modem =
1466 of_find_node_by_name(NULL, "i2c-modem");
1469 of_get_property(i2c_modem, "modem-id", NULL);
1470 if (mid) switch(*mid) {
1477 uap->port_type = PMAC_SCC_I2S1;
1479 printk(KERN_INFO "pmac_zilog: i2c-modem detected, id: %d\n",
1481 of_node_put(i2c_modem);
1483 printk(KERN_INFO "pmac_zilog: serial modem detected\n");
1488 * Init remaining bits of "port" structure
1490 uap->port.iotype = UPIO_MEM;
1491 uap->port.irq = irq_of_parse_and_map(np, 0);
1492 uap->port.uartclk = ZS_CLOCK;
1493 uap->port.fifosize = 1;
1494 uap->port.ops = &pmz_pops;
1495 uap->port.type = PORT_PMAC_ZILOG;
1496 uap->port.flags = 0;
1499 * Fixup for the port on Gatwick for which the device-tree has
1500 * missing interrupts. Normally, the macio_dev would contain
1501 * fixed up interrupt info, but we use the device-tree directly
1502 * here due to early probing so we need the fixup too.
1504 if (uap->port.irq == 0 &&
1505 np->parent && np->parent->parent &&
1506 of_device_is_compatible(np->parent->parent, "gatwick")) {
1507 /* IRQs on gatwick are offset by 64 */
1508 uap->port.irq = irq_create_mapping(NULL, 64 + 15);
1509 uap->tx_dma_irq = irq_create_mapping(NULL, 64 + 4);
1510 uap->rx_dma_irq = irq_create_mapping(NULL, 64 + 5);
1513 /* Setup some valid baud rate information in the register
1514 * shadows so we don't write crap there before baud rate is
1515 * first initialized.
1517 pmz_convert_to_zs(uap, CS8, 0, 9600);
1523 * Get rid of a port on module removal
1525 static void pmz_dispose_port(struct uart_pmac_port *uap)
1527 struct device_node *np;
1530 iounmap(uap->rx_dma_regs);
1531 iounmap(uap->tx_dma_regs);
1532 iounmap(uap->control_reg);
1535 memset(uap, 0, sizeof(struct uart_pmac_port));
1539 * Called upon match with an escc node in the device-tree.
1541 static int pmz_attach(struct macio_dev *mdev, const struct of_device_id *match)
1543 struct uart_pmac_port *uap;
1546 /* Iterate the pmz_ports array to find a matching entry
1548 for (i = 0; i < MAX_ZS_PORTS; i++)
1549 if (pmz_ports[i].node == mdev->ofdev.dev.of_node)
1551 if (i >= MAX_ZS_PORTS)
1555 uap = &pmz_ports[i];
1557 uap->port.dev = &mdev->ofdev.dev;
1558 dev_set_drvdata(&mdev->ofdev.dev, uap);
1560 /* We still activate the port even when failing to request resources
1561 * to work around bugs in ancient Apple device-trees
1563 if (macio_request_resources(uap->dev, "pmac_zilog"))
1564 printk(KERN_WARNING "%pOFn: Failed to request resource"
1565 ", port still active\n",
1568 uap->flags |= PMACZILOG_FLAG_RSRC_REQUESTED;
1570 return uart_add_one_port(&pmz_uart_reg, &uap->port);
1574 * That one should not be called, macio isn't really a hotswap device,
1575 * we don't expect one of those serial ports to go away...
1577 static int pmz_detach(struct macio_dev *mdev)
1579 struct uart_pmac_port *uap = dev_get_drvdata(&mdev->ofdev.dev);
1584 uart_remove_one_port(&pmz_uart_reg, &uap->port);
1586 if (uap->flags & PMACZILOG_FLAG_RSRC_REQUESTED) {
1587 macio_release_resources(uap->dev);
1588 uap->flags &= ~PMACZILOG_FLAG_RSRC_REQUESTED;
1590 dev_set_drvdata(&mdev->ofdev.dev, NULL);
1592 uap->port.dev = NULL;
1598 static int pmz_suspend(struct macio_dev *mdev, pm_message_t pm_state)
1600 struct uart_pmac_port *uap = dev_get_drvdata(&mdev->ofdev.dev);
1603 printk("HRM... pmz_suspend with NULL uap\n");
1607 uart_suspend_port(&pmz_uart_reg, &uap->port);
1613 static int pmz_resume(struct macio_dev *mdev)
1615 struct uart_pmac_port *uap = dev_get_drvdata(&mdev->ofdev.dev);
1620 uart_resume_port(&pmz_uart_reg, &uap->port);
1626 * Probe all ports in the system and build the ports array, we register
1627 * with the serial layer later, so we get a proper struct device which
1628 * allows the tty to attach properly. This is later than it used to be
1629 * but the tty layer really wants it that way.
1631 static int __init pmz_probe(void)
1633 struct device_node *node_p, *node_a, *node_b, *np;
1638 * Find all escc chips in the system
1640 for_each_node_by_name(node_p, "escc") {
1642 * First get channel A/B node pointers
1644 * TODO: Add routines with proper locking to do that...
1646 node_a = node_b = NULL;
1647 for_each_child_of_node(node_p, np) {
1648 if (of_node_name_prefix(np, "ch-a"))
1649 node_a = of_node_get(np);
1650 else if (of_node_name_prefix(np, "ch-b"))
1651 node_b = of_node_get(np);
1653 if (!node_a && !node_b) {
1654 of_node_put(node_a);
1655 of_node_put(node_b);
1656 printk(KERN_ERR "pmac_zilog: missing node %c for escc %pOF\n",
1657 (!node_a) ? 'a' : 'b', node_p);
1662 * Fill basic fields in the port structures
1664 if (node_b != NULL) {
1665 pmz_ports[count].mate = &pmz_ports[count+1];
1666 pmz_ports[count+1].mate = &pmz_ports[count];
1668 pmz_ports[count].flags = PMACZILOG_FLAG_IS_CHANNEL_A;
1669 pmz_ports[count].node = node_a;
1670 pmz_ports[count+1].node = node_b;
1671 pmz_ports[count].port.line = count;
1672 pmz_ports[count+1].port.line = count+1;
1675 * Setup the ports for real
1677 rc = pmz_init_port(&pmz_ports[count]);
1678 if (rc == 0 && node_b != NULL)
1679 rc = pmz_init_port(&pmz_ports[count+1]);
1681 of_node_put(node_a);
1682 of_node_put(node_b);
1683 memset(&pmz_ports[count], 0, sizeof(struct uart_pmac_port));
1684 memset(&pmz_ports[count+1], 0, sizeof(struct uart_pmac_port));
1689 pmz_ports_count = count;
1696 extern struct platform_device scc_a_pdev, scc_b_pdev;
1698 static int __init pmz_init_port(struct uart_pmac_port *uap)
1700 struct resource *r_ports;
1703 r_ports = platform_get_resource(uap->pdev, IORESOURCE_MEM, 0);
1704 irq = platform_get_irq(uap->pdev, 0);
1705 if (!r_ports || irq <= 0)
1708 uap->port.mapbase = r_ports->start;
1709 uap->port.membase = (unsigned char __iomem *) r_ports->start;
1710 uap->port.iotype = UPIO_MEM;
1711 uap->port.irq = irq;
1712 uap->port.uartclk = ZS_CLOCK;
1713 uap->port.fifosize = 1;
1714 uap->port.ops = &pmz_pops;
1715 uap->port.type = PORT_PMAC_ZILOG;
1716 uap->port.flags = 0;
1718 uap->control_reg = uap->port.membase;
1719 uap->data_reg = uap->control_reg + 4;
1721 uap->port.has_sysrq = IS_ENABLED(CONFIG_SERIAL_PMACZILOG_CONSOLE);
1723 pmz_convert_to_zs(uap, CS8, 0, 9600);
1728 static int __init pmz_probe(void)
1732 pmz_ports_count = 0;
1734 pmz_ports[0].port.line = 0;
1735 pmz_ports[0].flags = PMACZILOG_FLAG_IS_CHANNEL_A;
1736 pmz_ports[0].pdev = &scc_a_pdev;
1737 err = pmz_init_port(&pmz_ports[0]);
1742 pmz_ports[0].mate = &pmz_ports[1];
1743 pmz_ports[1].mate = &pmz_ports[0];
1744 pmz_ports[1].port.line = 1;
1745 pmz_ports[1].flags = 0;
1746 pmz_ports[1].pdev = &scc_b_pdev;
1747 err = pmz_init_port(&pmz_ports[1]);
1755 static void pmz_dispose_port(struct uart_pmac_port *uap)
1757 memset(uap, 0, sizeof(struct uart_pmac_port));
1760 static int __init pmz_attach(struct platform_device *pdev)
1762 struct uart_pmac_port *uap;
1765 /* Iterate the pmz_ports array to find a matching entry */
1766 for (i = 0; i < pmz_ports_count; i++)
1767 if (pmz_ports[i].pdev == pdev)
1769 if (i >= pmz_ports_count)
1772 uap = &pmz_ports[i];
1773 uap->port.dev = &pdev->dev;
1774 platform_set_drvdata(pdev, uap);
1776 return uart_add_one_port(&pmz_uart_reg, &uap->port);
1779 static int __exit pmz_detach(struct platform_device *pdev)
1781 struct uart_pmac_port *uap = platform_get_drvdata(pdev);
1786 uart_remove_one_port(&pmz_uart_reg, &uap->port);
1788 uap->port.dev = NULL;
1793 #endif /* !CONFIG_PPC_PMAC */
1795 #ifdef CONFIG_SERIAL_PMACZILOG_CONSOLE
1797 static void pmz_console_write(struct console *con, const char *s, unsigned int count);
1798 static int __init pmz_console_setup(struct console *co, char *options);
1800 static struct console pmz_console = {
1801 .name = PMACZILOG_NAME,
1802 .write = pmz_console_write,
1803 .device = uart_console_device,
1804 .setup = pmz_console_setup,
1805 .flags = CON_PRINTBUFFER,
1807 .data = &pmz_uart_reg,
1810 #define PMACZILOG_CONSOLE &pmz_console
1811 #else /* CONFIG_SERIAL_PMACZILOG_CONSOLE */
1812 #define PMACZILOG_CONSOLE (NULL)
1813 #endif /* CONFIG_SERIAL_PMACZILOG_CONSOLE */
1816 * Register the driver, console driver and ports with the serial
1819 static int __init pmz_register(void)
1821 pmz_uart_reg.nr = pmz_ports_count;
1822 pmz_uart_reg.cons = PMACZILOG_CONSOLE;
1825 * Register this driver with the serial core
1827 return uart_register_driver(&pmz_uart_reg);
1830 #ifdef CONFIG_PPC_PMAC
1832 static const struct of_device_id pmz_match[] =
1842 MODULE_DEVICE_TABLE (of, pmz_match);
1844 static struct macio_driver pmz_driver = {
1846 .name = "pmac_zilog",
1847 .owner = THIS_MODULE,
1848 .of_match_table = pmz_match,
1850 .probe = pmz_attach,
1851 .remove = pmz_detach,
1852 .suspend = pmz_suspend,
1853 .resume = pmz_resume,
1858 static struct platform_driver pmz_driver = {
1859 .remove = __exit_p(pmz_detach),
1865 #endif /* !CONFIG_PPC_PMAC */
1867 static int __init init_pmz(void)
1870 printk(KERN_INFO "%s\n", version);
1873 * First, we need to do a direct OF-based probe pass. We
1874 * do that because we want serial console up before the
1875 * macio stuffs calls us back, and since that makes it
1876 * easier to pass the proper number of channels to
1877 * uart_register_driver()
1879 if (pmz_ports_count == 0)
1883 * Bail early if no port found
1885 if (pmz_ports_count == 0)
1889 * Now we register with the serial layer
1891 rc = pmz_register();
1894 "pmac_zilog: Error registering serial device, disabling pmac_zilog.\n"
1895 "pmac_zilog: Did another serial driver already claim the minors?\n");
1896 /* effectively "pmz_unprobe()" */
1897 for (i=0; i < pmz_ports_count; i++)
1898 pmz_dispose_port(&pmz_ports[i]);
1903 * Then we register the macio driver itself
1905 #ifdef CONFIG_PPC_PMAC
1906 return macio_register_driver(&pmz_driver);
1908 return platform_driver_probe(&pmz_driver, pmz_attach);
1912 static void __exit exit_pmz(void)
1916 #ifdef CONFIG_PPC_PMAC
1917 /* Get rid of macio-driver (detach from macio) */
1918 macio_unregister_driver(&pmz_driver);
1920 platform_driver_unregister(&pmz_driver);
1923 for (i = 0; i < pmz_ports_count; i++) {
1924 struct uart_pmac_port *uport = &pmz_ports[i];
1925 #ifdef CONFIG_PPC_PMAC
1926 if (uport->node != NULL)
1927 pmz_dispose_port(uport);
1929 if (uport->pdev != NULL)
1930 pmz_dispose_port(uport);
1933 /* Unregister UART driver */
1934 uart_unregister_driver(&pmz_uart_reg);
1937 #ifdef CONFIG_SERIAL_PMACZILOG_CONSOLE
1939 static void pmz_console_putchar(struct uart_port *port, int ch)
1941 struct uart_pmac_port *uap =
1942 container_of(port, struct uart_pmac_port, port);
1944 /* Wait for the transmit buffer to empty. */
1945 while ((read_zsreg(uap, R0) & Tx_BUF_EMP) == 0)
1947 write_zsdata(uap, ch);
1951 * Print a string to the serial port trying not to disturb
1952 * any possible real use of the port...
1954 static void pmz_console_write(struct console *con, const char *s, unsigned int count)
1956 struct uart_pmac_port *uap = &pmz_ports[con->index];
1957 unsigned long flags;
1959 spin_lock_irqsave(&uap->port.lock, flags);
1961 /* Turn of interrupts and enable the transmitter. */
1962 write_zsreg(uap, R1, uap->curregs[1] & ~TxINT_ENAB);
1963 write_zsreg(uap, R5, uap->curregs[5] | TxENABLE | RTS | DTR);
1965 uart_console_write(&uap->port, s, count, pmz_console_putchar);
1967 /* Restore the values in the registers. */
1968 write_zsreg(uap, R1, uap->curregs[1]);
1969 /* Don't disable the transmitter. */
1971 spin_unlock_irqrestore(&uap->port.lock, flags);
1975 * Setup the serial console
1977 static int __init pmz_console_setup(struct console *co, char *options)
1979 struct uart_pmac_port *uap;
1980 struct uart_port *port;
1985 unsigned long pwr_delay;
1988 * XServe's default to 57600 bps
1990 if (of_machine_is_compatible("RackMac1,1")
1991 || of_machine_is_compatible("RackMac1,2")
1992 || of_machine_is_compatible("MacRISC4"))
1996 * Check whether an invalid uart number has been specified, and
1997 * if so, search for the first available port that does have
2000 if (co->index >= pmz_ports_count)
2002 uap = &pmz_ports[co->index];
2003 #ifdef CONFIG_PPC_PMAC
2004 if (uap->node == NULL)
2007 if (uap->pdev == NULL)
2013 * Mark port as beeing a console
2015 uap->flags |= PMACZILOG_FLAG_IS_CONS;
2018 * Temporary fix for uart layer who didn't setup the spinlock yet
2020 spin_lock_init(&port->lock);
2023 * Enable the hardware
2025 pwr_delay = __pmz_startup(uap);
2030 uart_parse_options(options, &baud, &parity, &bits, &flow);
2032 return uart_set_options(port, co, baud, parity, bits, flow);
2035 static int __init pmz_console_init(void)
2040 if (pmz_ports_count == 0)
2043 /* TODO: Autoprobe console based on OF */
2044 /* pmz_console.index = i; */
2045 register_console(&pmz_console);
2050 console_initcall(pmz_console_init);
2051 #endif /* CONFIG_SERIAL_PMACZILOG_CONSOLE */
2053 module_init(init_pmz);
2054 module_exit(exit_pmz);