1 /* sunzilog.c: Zilog serial driver for Sparc systems.
3 * Driver for Zilog serial chips found on Sun workstations and
4 * servers. This driver could actually be made more generic.
6 * This is based on the old drivers/sbus/char/zs.c code. A lot
7 * of code has been simply moved over directly from there but
8 * much has been rewritten. Credits therefore go out to Eddie
9 * C. Dost, Pete Zaitcev, Ted Ts'o and Alex Buell for their
12 * Copyright (C) 2002, 2006 David S. Miller (davem@davemloft.net)
15 #include <linux/module.h>
16 #include <linux/kernel.h>
17 #include <linux/sched.h>
18 #include <linux/errno.h>
19 #include <linux/delay.h>
20 #include <linux/tty.h>
21 #include <linux/tty_flip.h>
22 #include <linux/major.h>
23 #include <linux/string.h>
24 #include <linux/ptrace.h>
25 #include <linux/ioport.h>
26 #include <linux/slab.h>
27 #include <linux/circ_buf.h>
28 #include <linux/serial.h>
29 #include <linux/sysrq.h>
30 #include <linux/console.h>
31 #include <linux/spinlock.h>
33 #include <linux/serio.h>
35 #include <linux/init.h>
40 #include <asm/of_device.h>
42 #if defined(CONFIG_SERIAL_SUNZILOG_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
46 #include <linux/serial_core.h>
51 /* On 32-bit sparcs we need to delay after register accesses
52 * to accommodate sun4 systems, but we do not need to flush writes.
53 * On 64-bit sparc we only need to flush single writes to ensure
56 #ifndef CONFIG_SPARC64
57 #define ZSDELAY() udelay(5)
58 #define ZSDELAY_LONG() udelay(20)
59 #define ZS_WSYNC(channel) do { } while (0)
62 #define ZSDELAY_LONG()
63 #define ZS_WSYNC(__channel) \
64 readb(&((__channel)->control))
67 static int num_sunzilog;
68 #define NUM_SUNZILOG num_sunzilog
69 #define NUM_CHANNELS (NUM_SUNZILOG * 2)
71 #define ZS_CLOCK 4915200 /* Zilog input clock rate. */
72 #define ZS_CLOCK_DIVISOR 16 /* Divisor this driver uses. */
75 * We wrap our port structure around the generic uart_port.
77 struct uart_sunzilog_port {
78 struct uart_port port;
80 /* IRQ servicing chain. */
81 struct uart_sunzilog_port *next;
83 /* Current values of Zilog write registers. */
84 unsigned char curregs[NUM_ZSREGS];
87 #define SUNZILOG_FLAG_CONS_KEYB 0x00000001
88 #define SUNZILOG_FLAG_CONS_MOUSE 0x00000002
89 #define SUNZILOG_FLAG_IS_CONS 0x00000004
90 #define SUNZILOG_FLAG_IS_KGDB 0x00000008
91 #define SUNZILOG_FLAG_MODEM_STATUS 0x00000010
92 #define SUNZILOG_FLAG_IS_CHANNEL_A 0x00000020
93 #define SUNZILOG_FLAG_REGS_HELD 0x00000040
94 #define SUNZILOG_FLAG_TX_STOPPED 0x00000080
95 #define SUNZILOG_FLAG_TX_ACTIVE 0x00000100
99 unsigned char parity_mask;
100 unsigned char prev_status;
108 #define ZILOG_CHANNEL_FROM_PORT(PORT) ((struct zilog_channel __iomem *)((PORT)->membase))
109 #define UART_ZILOG(PORT) ((struct uart_sunzilog_port *)(PORT))
111 #define ZS_IS_KEYB(UP) ((UP)->flags & SUNZILOG_FLAG_CONS_KEYB)
112 #define ZS_IS_MOUSE(UP) ((UP)->flags & SUNZILOG_FLAG_CONS_MOUSE)
113 #define ZS_IS_CONS(UP) ((UP)->flags & SUNZILOG_FLAG_IS_CONS)
114 #define ZS_IS_KGDB(UP) ((UP)->flags & SUNZILOG_FLAG_IS_KGDB)
115 #define ZS_WANTS_MODEM_STATUS(UP) ((UP)->flags & SUNZILOG_FLAG_MODEM_STATUS)
116 #define ZS_IS_CHANNEL_A(UP) ((UP)->flags & SUNZILOG_FLAG_IS_CHANNEL_A)
117 #define ZS_REGS_HELD(UP) ((UP)->flags & SUNZILOG_FLAG_REGS_HELD)
118 #define ZS_TX_STOPPED(UP) ((UP)->flags & SUNZILOG_FLAG_TX_STOPPED)
119 #define ZS_TX_ACTIVE(UP) ((UP)->flags & SUNZILOG_FLAG_TX_ACTIVE)
121 /* Reading and writing Zilog8530 registers. The delays are to make this
122 * driver work on the Sun4 which needs a settling delay after each chip
123 * register access, other machines handle this in hardware via auxiliary
124 * flip-flops which implement the settle time we do in software.
126 * The port lock must be held and local IRQs must be disabled
127 * when {read,write}_zsreg is invoked.
129 static unsigned char read_zsreg(struct zilog_channel __iomem *channel,
132 unsigned char retval;
134 writeb(reg, &channel->control);
136 retval = readb(&channel->control);
142 static void write_zsreg(struct zilog_channel __iomem *channel,
143 unsigned char reg, unsigned char value)
145 writeb(reg, &channel->control);
147 writeb(value, &channel->control);
151 static void sunzilog_clear_fifo(struct zilog_channel __iomem *channel)
155 for (i = 0; i < 32; i++) {
156 unsigned char regval;
158 regval = readb(&channel->control);
160 if (regval & Rx_CH_AV)
163 regval = read_zsreg(channel, R1);
164 readb(&channel->data);
167 if (regval & (PAR_ERR | Rx_OVR | CRC_ERR)) {
168 writeb(ERR_RES, &channel->control);
175 /* This function must only be called when the TX is not busy. The UART
176 * port lock must be held and local interrupts disabled.
178 static void __load_zsregs(struct zilog_channel __iomem *channel, unsigned char *regs)
182 /* Let pending transmits finish. */
183 for (i = 0; i < 1000; i++) {
184 unsigned char stat = read_zsreg(channel, R1);
190 writeb(ERR_RES, &channel->control);
194 sunzilog_clear_fifo(channel);
196 /* Disable all interrupts. */
197 write_zsreg(channel, R1,
198 regs[R1] & ~(RxINT_MASK | TxINT_ENAB | EXT_INT_ENAB));
200 /* Set parity, sync config, stop bits, and clock divisor. */
201 write_zsreg(channel, R4, regs[R4]);
203 /* Set misc. TX/RX control bits. */
204 write_zsreg(channel, R10, regs[R10]);
206 /* Set TX/RX controls sans the enable bits. */
207 write_zsreg(channel, R3, regs[R3] & ~RxENAB);
208 write_zsreg(channel, R5, regs[R5] & ~TxENAB);
210 /* Synchronous mode config. */
211 write_zsreg(channel, R6, regs[R6]);
212 write_zsreg(channel, R7, regs[R7]);
214 /* Don't mess with the interrupt vector (R2, unused by us) and
215 * master interrupt control (R9). We make sure this is setup
216 * properly at probe time then never touch it again.
219 /* Disable baud generator. */
220 write_zsreg(channel, R14, regs[R14] & ~BRENAB);
222 /* Clock mode control. */
223 write_zsreg(channel, R11, regs[R11]);
225 /* Lower and upper byte of baud rate generator divisor. */
226 write_zsreg(channel, R12, regs[R12]);
227 write_zsreg(channel, R13, regs[R13]);
229 /* Now rewrite R14, with BRENAB (if set). */
230 write_zsreg(channel, R14, regs[R14]);
232 /* External status interrupt control. */
233 write_zsreg(channel, R15, regs[R15]);
235 /* Reset external status interrupts. */
236 write_zsreg(channel, R0, RES_EXT_INT);
237 write_zsreg(channel, R0, RES_EXT_INT);
239 /* Rewrite R3/R5, this time without enables masked. */
240 write_zsreg(channel, R3, regs[R3]);
241 write_zsreg(channel, R5, regs[R5]);
243 /* Rewrite R1, this time without IRQ enabled masked. */
244 write_zsreg(channel, R1, regs[R1]);
247 /* Reprogram the Zilog channel HW registers with the copies found in the
248 * software state struct. If the transmitter is busy, we defer this update
249 * until the next TX complete interrupt. Else, we do it right now.
251 * The UART port lock must be held and local interrupts disabled.
253 static void sunzilog_maybe_update_regs(struct uart_sunzilog_port *up,
254 struct zilog_channel __iomem *channel)
256 if (!ZS_REGS_HELD(up)) {
257 if (ZS_TX_ACTIVE(up)) {
258 up->flags |= SUNZILOG_FLAG_REGS_HELD;
260 __load_zsregs(channel, up->curregs);
265 static void sunzilog_change_mouse_baud(struct uart_sunzilog_port *up)
267 unsigned int cur_cflag = up->cflag;
271 up->cflag |= suncore_mouse_baud_cflag_next(cur_cflag, &new_baud);
273 brg = BPS_TO_BRG(new_baud, ZS_CLOCK / ZS_CLOCK_DIVISOR);
274 up->curregs[R12] = (brg & 0xff);
275 up->curregs[R13] = (brg >> 8) & 0xff;
276 sunzilog_maybe_update_regs(up, ZILOG_CHANNEL_FROM_PORT(&up->port));
279 static void sunzilog_kbdms_receive_chars(struct uart_sunzilog_port *up,
280 unsigned char ch, int is_break,
281 struct pt_regs *regs)
283 if (ZS_IS_KEYB(up)) {
284 /* Stop-A is handled by drivers/char/keyboard.c now. */
287 serio_interrupt(&up->serio, ch, 0, regs);
289 } else if (ZS_IS_MOUSE(up)) {
290 int ret = suncore_mouse_baud_detection(ch, is_break);
294 sunzilog_change_mouse_baud(up);
302 serio_interrupt(&up->serio, ch, 0, regs);
309 static struct tty_struct *
310 sunzilog_receive_chars(struct uart_sunzilog_port *up,
311 struct zilog_channel __iomem *channel,
312 struct pt_regs *regs)
314 struct tty_struct *tty;
315 unsigned char ch, r1, flag;
318 if (up->port.info != NULL && /* Unopened serial console */
319 up->port.info->tty != NULL) /* Keyboard || mouse */
320 tty = up->port.info->tty;
324 r1 = read_zsreg(channel, R1);
325 if (r1 & (PAR_ERR | Rx_OVR | CRC_ERR)) {
326 writeb(ERR_RES, &channel->control);
331 ch = readb(&channel->control);
334 /* This funny hack depends upon BRK_ABRT not interfering
335 * with the other bits we care about in R1.
340 if (!(ch & Rx_CH_AV))
343 ch = readb(&channel->data);
346 ch &= up->parity_mask;
348 if (unlikely(ZS_IS_KEYB(up)) || unlikely(ZS_IS_MOUSE(up))) {
349 sunzilog_kbdms_receive_chars(up, ch, 0, regs);
354 uart_handle_sysrq_char(&up->port, ch, regs);
358 /* A real serial line, record the character and status. */
360 up->port.icount.rx++;
361 if (r1 & (BRK_ABRT | PAR_ERR | Rx_OVR | CRC_ERR)) {
363 r1 &= ~(PAR_ERR | CRC_ERR);
364 up->port.icount.brk++;
365 if (uart_handle_break(&up->port))
368 else if (r1 & PAR_ERR)
369 up->port.icount.parity++;
370 else if (r1 & CRC_ERR)
371 up->port.icount.frame++;
373 up->port.icount.overrun++;
374 r1 &= up->port.read_status_mask;
377 else if (r1 & PAR_ERR)
379 else if (r1 & CRC_ERR)
382 if (uart_handle_sysrq_char(&up->port, ch, regs))
385 if (up->port.ignore_status_mask == 0xff ||
386 (r1 & up->port.ignore_status_mask) == 0) {
387 tty_insert_flip_char(tty, ch, flag);
390 tty_insert_flip_char(tty, 0, TTY_OVERRUN);
396 static void sunzilog_status_handle(struct uart_sunzilog_port *up,
397 struct zilog_channel __iomem *channel,
398 struct pt_regs *regs)
400 unsigned char status;
402 status = readb(&channel->control);
405 writeb(RES_EXT_INT, &channel->control);
409 if (status & BRK_ABRT) {
411 sunzilog_kbdms_receive_chars(up, 0, 1, regs);
412 if (ZS_IS_CONS(up)) {
413 /* Wait for BREAK to deassert to avoid potentially
414 * confusing the PROM.
417 status = readb(&channel->control);
419 if (!(status & BRK_ABRT))
427 if (ZS_WANTS_MODEM_STATUS(up)) {
429 up->port.icount.dsr++;
431 /* The Zilog just gives us an interrupt when DCD/CTS/etc. change.
432 * But it does not tell us which bit has changed, we have to keep
433 * track of this ourselves.
435 if ((status ^ up->prev_status) ^ DCD)
436 uart_handle_dcd_change(&up->port,
438 if ((status ^ up->prev_status) ^ CTS)
439 uart_handle_cts_change(&up->port,
442 wake_up_interruptible(&up->port.info->delta_msr_wait);
445 up->prev_status = status;
448 static void sunzilog_transmit_chars(struct uart_sunzilog_port *up,
449 struct zilog_channel __iomem *channel)
451 struct circ_buf *xmit;
453 if (ZS_IS_CONS(up)) {
454 unsigned char status = readb(&channel->control);
457 /* TX still busy? Just wait for the next TX done interrupt.
459 * It can occur because of how we do serial console writes. It would
460 * be nice to transmit console writes just like we normally would for
461 * a TTY line. (ie. buffered and TX interrupt driven). That is not
462 * easy because console writes cannot sleep. One solution might be
463 * to poll on enough port->xmit space becomming free. -DaveM
465 if (!(status & Tx_BUF_EMP))
469 up->flags &= ~SUNZILOG_FLAG_TX_ACTIVE;
471 if (ZS_REGS_HELD(up)) {
472 __load_zsregs(channel, up->curregs);
473 up->flags &= ~SUNZILOG_FLAG_REGS_HELD;
476 if (ZS_TX_STOPPED(up)) {
477 up->flags &= ~SUNZILOG_FLAG_TX_STOPPED;
481 if (up->port.x_char) {
482 up->flags |= SUNZILOG_FLAG_TX_ACTIVE;
483 writeb(up->port.x_char, &channel->data);
487 up->port.icount.tx++;
492 if (up->port.info == NULL)
494 xmit = &up->port.info->xmit;
495 if (uart_circ_empty(xmit))
498 if (uart_tx_stopped(&up->port))
501 up->flags |= SUNZILOG_FLAG_TX_ACTIVE;
502 writeb(xmit->buf[xmit->tail], &channel->data);
506 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
507 up->port.icount.tx++;
509 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
510 uart_write_wakeup(&up->port);
515 writeb(RES_Tx_P, &channel->control);
520 static irqreturn_t sunzilog_interrupt(int irq, void *dev_id, struct pt_regs *regs)
522 struct uart_sunzilog_port *up = dev_id;
525 struct zilog_channel __iomem *channel
526 = ZILOG_CHANNEL_FROM_PORT(&up->port);
527 struct tty_struct *tty;
530 spin_lock(&up->port.lock);
531 r3 = read_zsreg(channel, R3);
535 if (r3 & (CHAEXT | CHATxIP | CHARxIP)) {
536 writeb(RES_H_IUS, &channel->control);
541 tty = sunzilog_receive_chars(up, channel, regs);
543 sunzilog_status_handle(up, channel, regs);
545 sunzilog_transmit_chars(up, channel);
547 spin_unlock(&up->port.lock);
550 tty_flip_buffer_push(tty);
554 channel = ZILOG_CHANNEL_FROM_PORT(&up->port);
556 spin_lock(&up->port.lock);
558 if (r3 & (CHBEXT | CHBTxIP | CHBRxIP)) {
559 writeb(RES_H_IUS, &channel->control);
564 tty = sunzilog_receive_chars(up, channel, regs);
566 sunzilog_status_handle(up, channel, regs);
568 sunzilog_transmit_chars(up, channel);
570 spin_unlock(&up->port.lock);
573 tty_flip_buffer_push(tty);
581 /* A convenient way to quickly get R0 status. The caller must _not_ hold the
582 * port lock, it is acquired here.
584 static __inline__ unsigned char sunzilog_read_channel_status(struct uart_port *port)
586 struct zilog_channel __iomem *channel;
587 unsigned char status;
589 channel = ZILOG_CHANNEL_FROM_PORT(port);
590 status = readb(&channel->control);
596 /* The port lock is not held. */
597 static unsigned int sunzilog_tx_empty(struct uart_port *port)
600 unsigned char status;
603 spin_lock_irqsave(&port->lock, flags);
605 status = sunzilog_read_channel_status(port);
607 spin_unlock_irqrestore(&port->lock, flags);
609 if (status & Tx_BUF_EMP)
617 /* The port lock is held and interrupts are disabled. */
618 static unsigned int sunzilog_get_mctrl(struct uart_port *port)
620 unsigned char status;
623 status = sunzilog_read_channel_status(port);
636 /* The port lock is held and interrupts are disabled. */
637 static void sunzilog_set_mctrl(struct uart_port *port, unsigned int mctrl)
639 struct uart_sunzilog_port *up = (struct uart_sunzilog_port *) port;
640 struct zilog_channel __iomem *channel = ZILOG_CHANNEL_FROM_PORT(port);
641 unsigned char set_bits, clear_bits;
643 set_bits = clear_bits = 0;
645 if (mctrl & TIOCM_RTS)
649 if (mctrl & TIOCM_DTR)
654 /* NOTE: Not subject to 'transmitter active' rule. */
655 up->curregs[R5] |= set_bits;
656 up->curregs[R5] &= ~clear_bits;
657 write_zsreg(channel, R5, up->curregs[R5]);
660 /* The port lock is held and interrupts are disabled. */
661 static void sunzilog_stop_tx(struct uart_port *port)
663 struct uart_sunzilog_port *up = (struct uart_sunzilog_port *) port;
665 up->flags |= SUNZILOG_FLAG_TX_STOPPED;
668 /* The port lock is held and interrupts are disabled. */
669 static void sunzilog_start_tx(struct uart_port *port)
671 struct uart_sunzilog_port *up = (struct uart_sunzilog_port *) port;
672 struct zilog_channel __iomem *channel = ZILOG_CHANNEL_FROM_PORT(port);
673 unsigned char status;
675 up->flags |= SUNZILOG_FLAG_TX_ACTIVE;
676 up->flags &= ~SUNZILOG_FLAG_TX_STOPPED;
678 status = readb(&channel->control);
681 /* TX busy? Just wait for the TX done interrupt. */
682 if (!(status & Tx_BUF_EMP))
685 /* Send the first character to jump-start the TX done
686 * IRQ sending engine.
689 writeb(port->x_char, &channel->data);
696 struct circ_buf *xmit = &port->info->xmit;
698 writeb(xmit->buf[xmit->tail], &channel->data);
702 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
705 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
706 uart_write_wakeup(&up->port);
710 /* The port lock is held. */
711 static void sunzilog_stop_rx(struct uart_port *port)
713 struct uart_sunzilog_port *up = UART_ZILOG(port);
714 struct zilog_channel __iomem *channel;
719 channel = ZILOG_CHANNEL_FROM_PORT(port);
721 /* Disable all RX interrupts. */
722 up->curregs[R1] &= ~RxINT_MASK;
723 sunzilog_maybe_update_regs(up, channel);
726 /* The port lock is held. */
727 static void sunzilog_enable_ms(struct uart_port *port)
729 struct uart_sunzilog_port *up = (struct uart_sunzilog_port *) port;
730 struct zilog_channel __iomem *channel = ZILOG_CHANNEL_FROM_PORT(port);
731 unsigned char new_reg;
733 new_reg = up->curregs[R15] | (DCDIE | SYNCIE | CTSIE);
734 if (new_reg != up->curregs[R15]) {
735 up->curregs[R15] = new_reg;
737 /* NOTE: Not subject to 'transmitter active' rule. */
738 write_zsreg(channel, R15, up->curregs[R15]);
742 /* The port lock is not held. */
743 static void sunzilog_break_ctl(struct uart_port *port, int break_state)
745 struct uart_sunzilog_port *up = (struct uart_sunzilog_port *) port;
746 struct zilog_channel __iomem *channel = ZILOG_CHANNEL_FROM_PORT(port);
747 unsigned char set_bits, clear_bits, new_reg;
750 set_bits = clear_bits = 0;
755 clear_bits |= SND_BRK;
757 spin_lock_irqsave(&port->lock, flags);
759 new_reg = (up->curregs[R5] | set_bits) & ~clear_bits;
760 if (new_reg != up->curregs[R5]) {
761 up->curregs[R5] = new_reg;
763 /* NOTE: Not subject to 'transmitter active' rule. */
764 write_zsreg(channel, R5, up->curregs[R5]);
767 spin_unlock_irqrestore(&port->lock, flags);
770 static void __sunzilog_startup(struct uart_sunzilog_port *up)
772 struct zilog_channel __iomem *channel;
774 channel = ZILOG_CHANNEL_FROM_PORT(&up->port);
775 up->prev_status = readb(&channel->control);
777 /* Enable receiver and transmitter. */
778 up->curregs[R3] |= RxENAB;
779 up->curregs[R5] |= TxENAB;
781 up->curregs[R1] |= EXT_INT_ENAB | INT_ALL_Rx | TxINT_ENAB;
782 sunzilog_maybe_update_regs(up, channel);
785 static int sunzilog_startup(struct uart_port *port)
787 struct uart_sunzilog_port *up = UART_ZILOG(port);
793 spin_lock_irqsave(&port->lock, flags);
794 __sunzilog_startup(up);
795 spin_unlock_irqrestore(&port->lock, flags);
800 * The test for ZS_IS_CONS is explained by the following e-mail:
802 * From: Russell King <rmk@arm.linux.org.uk>
803 * Date: Sun, 8 Dec 2002 10:18:38 +0000
805 * On Sun, Dec 08, 2002 at 02:43:36AM -0500, Pete Zaitcev wrote:
806 * > I boot my 2.5 boxes using "console=ttyS0,9600" argument,
807 * > and I noticed that something is not right with reference
808 * > counting in this case. It seems that when the console
809 * > is open by kernel initially, this is not accounted
810 * > as an open, and uart_startup is not called.
812 * That is correct. We are unable to call uart_startup when the serial
813 * console is initialised because it may need to allocate memory (as
814 * request_irq does) and the memory allocators may not have been
817 * 1. initialise the port into a state where it can send characters in the
818 * console write method.
820 * 2. don't do the actual hardware shutdown in your shutdown() method (but
821 * do the normal software shutdown - ie, free irqs etc)
824 static void sunzilog_shutdown(struct uart_port *port)
826 struct uart_sunzilog_port *up = UART_ZILOG(port);
827 struct zilog_channel __iomem *channel;
833 spin_lock_irqsave(&port->lock, flags);
835 channel = ZILOG_CHANNEL_FROM_PORT(port);
837 /* Disable receiver and transmitter. */
838 up->curregs[R3] &= ~RxENAB;
839 up->curregs[R5] &= ~TxENAB;
841 /* Disable all interrupts and BRK assertion. */
842 up->curregs[R1] &= ~(EXT_INT_ENAB | TxINT_ENAB | RxINT_MASK);
843 up->curregs[R5] &= ~SND_BRK;
844 sunzilog_maybe_update_regs(up, channel);
846 spin_unlock_irqrestore(&port->lock, flags);
849 /* Shared by TTY driver and serial console setup. The port lock is held
850 * and local interrupts are disabled.
853 sunzilog_convert_to_zs(struct uart_sunzilog_port *up, unsigned int cflag,
854 unsigned int iflag, int brg)
857 up->curregs[R10] = NRZ;
858 up->curregs[R11] = TCBR | RCBR;
860 /* Program BAUD and clock source. */
861 up->curregs[R4] &= ~XCLK_MASK;
862 up->curregs[R4] |= X16CLK;
863 up->curregs[R12] = brg & 0xff;
864 up->curregs[R13] = (brg >> 8) & 0xff;
865 up->curregs[R14] = BRSRC | BRENAB;
867 /* Character size, stop bits, and parity. */
868 up->curregs[3] &= ~RxN_MASK;
869 up->curregs[5] &= ~TxN_MASK;
870 switch (cflag & CSIZE) {
872 up->curregs[3] |= Rx5;
873 up->curregs[5] |= Tx5;
874 up->parity_mask = 0x1f;
877 up->curregs[3] |= Rx6;
878 up->curregs[5] |= Tx6;
879 up->parity_mask = 0x3f;
882 up->curregs[3] |= Rx7;
883 up->curregs[5] |= Tx7;
884 up->parity_mask = 0x7f;
888 up->curregs[3] |= Rx8;
889 up->curregs[5] |= Tx8;
890 up->parity_mask = 0xff;
893 up->curregs[4] &= ~0x0c;
895 up->curregs[4] |= SB2;
897 up->curregs[4] |= SB1;
899 up->curregs[4] |= PAR_ENAB;
901 up->curregs[4] &= ~PAR_ENAB;
902 if (!(cflag & PARODD))
903 up->curregs[4] |= PAR_EVEN;
905 up->curregs[4] &= ~PAR_EVEN;
907 up->port.read_status_mask = Rx_OVR;
909 up->port.read_status_mask |= CRC_ERR | PAR_ERR;
910 if (iflag & (BRKINT | PARMRK))
911 up->port.read_status_mask |= BRK_ABRT;
913 up->port.ignore_status_mask = 0;
915 up->port.ignore_status_mask |= CRC_ERR | PAR_ERR;
916 if (iflag & IGNBRK) {
917 up->port.ignore_status_mask |= BRK_ABRT;
919 up->port.ignore_status_mask |= Rx_OVR;
922 if ((cflag & CREAD) == 0)
923 up->port.ignore_status_mask = 0xff;
926 /* The port lock is not held. */
928 sunzilog_set_termios(struct uart_port *port, struct termios *termios,
931 struct uart_sunzilog_port *up = (struct uart_sunzilog_port *) port;
935 baud = uart_get_baud_rate(port, termios, old, 1200, 76800);
937 spin_lock_irqsave(&up->port.lock, flags);
939 brg = BPS_TO_BRG(baud, ZS_CLOCK / ZS_CLOCK_DIVISOR);
941 sunzilog_convert_to_zs(up, termios->c_cflag, termios->c_iflag, brg);
943 if (UART_ENABLE_MS(&up->port, termios->c_cflag))
944 up->flags |= SUNZILOG_FLAG_MODEM_STATUS;
946 up->flags &= ~SUNZILOG_FLAG_MODEM_STATUS;
948 up->cflag = termios->c_cflag;
950 sunzilog_maybe_update_regs(up, ZILOG_CHANNEL_FROM_PORT(port));
952 uart_update_timeout(port, termios->c_cflag, baud);
954 spin_unlock_irqrestore(&up->port.lock, flags);
957 static const char *sunzilog_type(struct uart_port *port)
962 /* We do not request/release mappings of the registers here, this
963 * happens at early serial probe time.
965 static void sunzilog_release_port(struct uart_port *port)
969 static int sunzilog_request_port(struct uart_port *port)
974 /* These do not need to do anything interesting either. */
975 static void sunzilog_config_port(struct uart_port *port, int flags)
979 /* We do not support letting the user mess with the divisor, IRQ, etc. */
980 static int sunzilog_verify_port(struct uart_port *port, struct serial_struct *ser)
985 static struct uart_ops sunzilog_pops = {
986 .tx_empty = sunzilog_tx_empty,
987 .set_mctrl = sunzilog_set_mctrl,
988 .get_mctrl = sunzilog_get_mctrl,
989 .stop_tx = sunzilog_stop_tx,
990 .start_tx = sunzilog_start_tx,
991 .stop_rx = sunzilog_stop_rx,
992 .enable_ms = sunzilog_enable_ms,
993 .break_ctl = sunzilog_break_ctl,
994 .startup = sunzilog_startup,
995 .shutdown = sunzilog_shutdown,
996 .set_termios = sunzilog_set_termios,
997 .type = sunzilog_type,
998 .release_port = sunzilog_release_port,
999 .request_port = sunzilog_request_port,
1000 .config_port = sunzilog_config_port,
1001 .verify_port = sunzilog_verify_port,
1004 static struct uart_sunzilog_port *sunzilog_port_table;
1005 static struct zilog_layout __iomem **sunzilog_chip_regs;
1007 static struct uart_sunzilog_port *sunzilog_irq_chain;
1009 static struct uart_driver sunzilog_reg = {
1010 .owner = THIS_MODULE,
1011 .driver_name = "ttyS",
1016 static int __init sunzilog_alloc_tables(void)
1018 struct uart_sunzilog_port *up;
1022 size = NUM_CHANNELS * sizeof(struct uart_sunzilog_port);
1023 sunzilog_port_table = kzalloc(size, GFP_KERNEL);
1024 if (!sunzilog_port_table)
1027 for (i = 0; i < NUM_CHANNELS; i++) {
1028 up = &sunzilog_port_table[i];
1030 spin_lock_init(&up->port.lock);
1033 sunzilog_irq_chain = up;
1035 if (i < NUM_CHANNELS - 1)
1041 size = NUM_SUNZILOG * sizeof(struct zilog_layout __iomem *);
1042 sunzilog_chip_regs = kzalloc(size, GFP_KERNEL);
1043 if (!sunzilog_chip_regs) {
1044 kfree(sunzilog_port_table);
1045 sunzilog_irq_chain = NULL;
1052 static void sunzilog_free_tables(void)
1054 kfree(sunzilog_port_table);
1055 sunzilog_irq_chain = NULL;
1056 kfree(sunzilog_chip_regs);
1059 #define ZS_PUT_CHAR_MAX_DELAY 2000 /* 10 ms */
1061 static void sunzilog_putchar(struct uart_port *port, int ch)
1063 struct zilog_channel *channel = ZILOG_CHANNEL_FROM_PORT(port);
1064 int loops = ZS_PUT_CHAR_MAX_DELAY;
1066 /* This is a timed polling loop so do not switch the explicit
1067 * udelay with ZSDELAY as that is a NOP on some platforms. -DaveM
1070 unsigned char val = readb(&channel->control);
1071 if (val & Tx_BUF_EMP) {
1078 writeb(ch, &channel->data);
1085 static DEFINE_SPINLOCK(sunzilog_serio_lock);
1087 static int sunzilog_serio_write(struct serio *serio, unsigned char ch)
1089 struct uart_sunzilog_port *up = serio->port_data;
1090 unsigned long flags;
1092 spin_lock_irqsave(&sunzilog_serio_lock, flags);
1094 sunzilog_putchar(&up->port, ch);
1096 spin_unlock_irqrestore(&sunzilog_serio_lock, flags);
1101 static int sunzilog_serio_open(struct serio *serio)
1103 struct uart_sunzilog_port *up = serio->port_data;
1104 unsigned long flags;
1107 spin_lock_irqsave(&sunzilog_serio_lock, flags);
1108 if (!up->serio_open) {
1113 spin_unlock_irqrestore(&sunzilog_serio_lock, flags);
1118 static void sunzilog_serio_close(struct serio *serio)
1120 struct uart_sunzilog_port *up = serio->port_data;
1121 unsigned long flags;
1123 spin_lock_irqsave(&sunzilog_serio_lock, flags);
1125 spin_unlock_irqrestore(&sunzilog_serio_lock, flags);
1128 #endif /* CONFIG_SERIO */
1130 #ifdef CONFIG_SERIAL_SUNZILOG_CONSOLE
1132 sunzilog_console_write(struct console *con, const char *s, unsigned int count)
1134 struct uart_sunzilog_port *up = &sunzilog_port_table[con->index];
1135 unsigned long flags;
1137 spin_lock_irqsave(&up->port.lock, flags);
1138 uart_console_write(&up->port, s, count, sunzilog_putchar);
1140 spin_unlock_irqrestore(&up->port.lock, flags);
1143 static int __init sunzilog_console_setup(struct console *con, char *options)
1145 struct uart_sunzilog_port *up = &sunzilog_port_table[con->index];
1146 unsigned long flags;
1149 printk(KERN_INFO "Console: ttyS%d (SunZilog zs%d)\n",
1150 (sunzilog_reg.minor - 64) + con->index, con->index);
1152 /* Get firmware console settings. */
1153 sunserial_console_termios(con);
1155 /* Firmware console speed is limited to 150-->38400 baud so
1156 * this hackish cflag thing is OK.
1158 switch (con->cflag & CBAUD) {
1159 case B150: baud = 150; break;
1160 case B300: baud = 300; break;
1161 case B600: baud = 600; break;
1162 case B1200: baud = 1200; break;
1163 case B2400: baud = 2400; break;
1164 case B4800: baud = 4800; break;
1165 default: case B9600: baud = 9600; break;
1166 case B19200: baud = 19200; break;
1167 case B38400: baud = 38400; break;
1170 brg = BPS_TO_BRG(baud, ZS_CLOCK / ZS_CLOCK_DIVISOR);
1172 spin_lock_irqsave(&up->port.lock, flags);
1174 up->curregs[R15] = BRKIE;
1175 sunzilog_convert_to_zs(up, con->cflag, 0, brg);
1177 sunzilog_set_mctrl(&up->port, TIOCM_DTR | TIOCM_RTS);
1178 __sunzilog_startup(up);
1180 spin_unlock_irqrestore(&up->port.lock, flags);
1185 static struct console sunzilog_console = {
1187 .write = sunzilog_console_write,
1188 .device = uart_console_device,
1189 .setup = sunzilog_console_setup,
1190 .flags = CON_PRINTBUFFER,
1192 .data = &sunzilog_reg,
1195 static inline struct console *SUNZILOG_CONSOLE(void)
1199 if (con_is_present())
1202 for (i = 0; i < NUM_CHANNELS; i++) {
1203 int this_minor = sunzilog_reg.minor + i;
1205 if ((this_minor - 64) == (serial_console - 1))
1208 if (i == NUM_CHANNELS)
1211 sunzilog_console.index = i;
1212 sunzilog_port_table[i].flags |= SUNZILOG_FLAG_IS_CONS;
1214 return &sunzilog_console;
1218 #define SUNZILOG_CONSOLE() (NULL)
1221 static void __init sunzilog_init_kbdms(struct uart_sunzilog_port *up, int channel)
1225 if (up->flags & SUNZILOG_FLAG_CONS_KEYB) {
1226 up->cflag = B1200 | CS8 | CLOCAL | CREAD;
1229 up->cflag = B4800 | CS8 | CLOCAL | CREAD;
1233 up->curregs[R15] = BRKIE;
1234 brg = BPS_TO_BRG(baud, ZS_CLOCK / ZS_CLOCK_DIVISOR);
1235 sunzilog_convert_to_zs(up, up->cflag, 0, brg);
1236 sunzilog_set_mctrl(&up->port, TIOCM_DTR | TIOCM_RTS);
1237 __sunzilog_startup(up);
1241 static void __init sunzilog_register_serio(struct uart_sunzilog_port *up)
1243 struct serio *serio = &up->serio;
1245 serio->port_data = up;
1247 serio->id.type = SERIO_RS232;
1248 if (up->flags & SUNZILOG_FLAG_CONS_KEYB) {
1249 serio->id.proto = SERIO_SUNKBD;
1250 strlcpy(serio->name, "zskbd", sizeof(serio->name));
1252 serio->id.proto = SERIO_SUN;
1253 serio->id.extra = 1;
1254 strlcpy(serio->name, "zsms", sizeof(serio->name));
1256 strlcpy(serio->phys,
1257 ((up->flags & SUNZILOG_FLAG_CONS_KEYB) ?
1258 "zs/serio0" : "zs/serio1"),
1259 sizeof(serio->phys));
1261 serio->write = sunzilog_serio_write;
1262 serio->open = sunzilog_serio_open;
1263 serio->close = sunzilog_serio_close;
1264 serio->dev.parent = up->port.dev;
1266 serio_register_port(serio);
1270 static void __init sunzilog_init_hw(struct uart_sunzilog_port *up)
1272 struct zilog_channel __iomem *channel;
1273 unsigned long flags;
1276 channel = ZILOG_CHANNEL_FROM_PORT(&up->port);
1278 spin_lock_irqsave(&up->port.lock, flags);
1279 if (ZS_IS_CHANNEL_A(up)) {
1280 write_zsreg(channel, R9, FHWRES);
1282 (void) read_zsreg(channel, R0);
1285 if (up->flags & (SUNZILOG_FLAG_CONS_KEYB |
1286 SUNZILOG_FLAG_CONS_MOUSE)) {
1287 sunzilog_init_kbdms(up, up->port.line);
1288 up->curregs[R9] |= (NV | MIE);
1289 write_zsreg(channel, R9, up->curregs[R9]);
1291 /* Normal serial TTY. */
1292 up->parity_mask = 0xff;
1293 up->curregs[R1] = EXT_INT_ENAB | INT_ALL_Rx | TxINT_ENAB;
1294 up->curregs[R4] = PAR_EVEN | X16CLK | SB1;
1295 up->curregs[R3] = RxENAB | Rx8;
1296 up->curregs[R5] = TxENAB | Tx8;
1297 up->curregs[R9] = NV | MIE;
1298 up->curregs[R10] = NRZ;
1299 up->curregs[R11] = TCBR | RCBR;
1301 brg = BPS_TO_BRG(baud, ZS_CLOCK / ZS_CLOCK_DIVISOR);
1302 up->curregs[R12] = (brg & 0xff);
1303 up->curregs[R13] = (brg >> 8) & 0xff;
1304 up->curregs[R14] = BRSRC | BRENAB;
1305 __load_zsregs(channel, up->curregs);
1306 write_zsreg(channel, R9, up->curregs[R9]);
1309 spin_unlock_irqrestore(&up->port.lock, flags);
1312 if (up->flags & (SUNZILOG_FLAG_CONS_KEYB |
1313 SUNZILOG_FLAG_CONS_MOUSE))
1314 sunzilog_register_serio(up);
1318 static int zilog_irq = -1;
1320 static int __devinit zs_probe(struct of_device *op, const struct of_device_id *match)
1323 struct uart_sunzilog_port *up;
1324 struct zilog_layout __iomem *rp;
1329 if (of_find_property(op->node, "keyboard", NULL))
1332 sunzilog_chip_regs[inst] = of_ioremap(&op->resource[0], 0,
1333 sizeof(struct zilog_layout),
1335 if (!sunzilog_chip_regs[inst])
1338 rp = sunzilog_chip_regs[inst];
1340 if (zilog_irq == -1)
1341 zilog_irq = op->irqs[0];
1343 up = &sunzilog_port_table[inst * 2];
1346 up[0].port.mapbase = op->resource[0].start + 0x00;
1347 up[0].port.membase = (void __iomem *) &rp->channelA;
1348 up[0].port.iotype = UPIO_MEM;
1349 up[0].port.irq = op->irqs[0];
1350 up[0].port.uartclk = ZS_CLOCK;
1351 up[0].port.fifosize = 1;
1352 up[0].port.ops = &sunzilog_pops;
1353 up[0].port.type = PORT_SUNZILOG;
1354 up[0].port.flags = 0;
1355 up[0].port.line = (inst * 2) + 0;
1356 up[0].port.dev = &op->dev;
1357 up[0].flags |= SUNZILOG_FLAG_IS_CHANNEL_A;
1359 up[0].flags |= SUNZILOG_FLAG_CONS_KEYB;
1360 sunzilog_init_hw(&up[0]);
1363 up[1].port.mapbase = op->resource[0].start + 0x04;
1364 up[1].port.membase = (void __iomem *) &rp->channelB;
1365 up[1].port.iotype = UPIO_MEM;
1366 up[1].port.irq = op->irqs[0];
1367 up[1].port.uartclk = ZS_CLOCK;
1368 up[1].port.fifosize = 1;
1369 up[1].port.ops = &sunzilog_pops;
1370 up[1].port.type = PORT_SUNZILOG;
1371 up[1].port.flags = 0;
1372 up[1].port.line = (inst * 2) + 1;
1373 up[1].port.dev = &op->dev;
1376 up[1].flags |= SUNZILOG_FLAG_CONS_MOUSE;
1377 sunzilog_init_hw(&up[1]);
1379 if (!keyboard_mouse) {
1380 err = uart_add_one_port(&sunzilog_reg, &up[0].port);
1382 of_iounmap(rp, sizeof(struct zilog_layout));
1385 err = uart_add_one_port(&sunzilog_reg, &up[1].port);
1387 uart_remove_one_port(&sunzilog_reg, &up[0].port);
1388 of_iounmap(rp, sizeof(struct zilog_layout));
1392 printk(KERN_INFO "%s: Keyboard at MMIO %lx (irq = %d) "
1394 op->dev.bus_id, up[0].port.mapbase, op->irqs[0]);
1395 printk(KERN_INFO "%s: Mouse at MMIO %lx (irq = %d) "
1397 op->dev.bus_id, up[1].port.mapbase, op->irqs[0]);
1400 dev_set_drvdata(&op->dev, &up[0]);
1407 static void __devexit zs_remove_one(struct uart_sunzilog_port *up)
1409 if (ZS_IS_KEYB(up) || ZS_IS_MOUSE(up)) {
1411 serio_unregister_port(&up->serio);
1414 uart_remove_one_port(&sunzilog_reg, &up->port);
1417 static int __devexit zs_remove(struct of_device *dev)
1419 struct uart_sunzilog_port *up = dev_get_drvdata(&dev->dev);
1420 struct zilog_layout __iomem *regs;
1422 zs_remove_one(&up[0]);
1423 zs_remove_one(&up[1]);
1425 regs = sunzilog_chip_regs[up[0].port.line / 2];
1426 of_iounmap(regs, sizeof(struct zilog_layout));
1428 dev_set_drvdata(&dev->dev, NULL);
1433 static struct of_device_id zs_match[] = {
1439 MODULE_DEVICE_TABLE(of, zs_match);
1441 static struct of_platform_driver zs_driver = {
1443 .match_table = zs_match,
1445 .remove = __devexit_p(zs_remove),
1448 static int __init sunzilog_init(void)
1450 struct device_node *dp;
1451 int err, uart_count;
1456 for_each_node_by_name(dp, "zs") {
1458 if (of_find_property(dp, "keyboard", NULL))
1466 err = sunzilog_alloc_tables();
1470 uart_count = (NUM_SUNZILOG * 2) - (2 * num_keybms);
1472 sunzilog_reg.nr = uart_count;
1473 sunzilog_reg.minor = sunserial_current_minor;
1474 err = uart_register_driver(&sunzilog_reg);
1476 goto out_free_tables;
1478 sunzilog_reg.tty_driver->name_base = sunzilog_reg.minor - 64;
1479 sunzilog_reg.cons = SUNZILOG_CONSOLE();
1481 sunserial_current_minor += uart_count;
1484 err = of_register_driver(&zs_driver, &of_bus_type);
1486 goto out_unregister_uart;
1488 if (zilog_irq != -1) {
1489 err = request_irq(zilog_irq, sunzilog_interrupt, IRQF_SHARED,
1490 "zs", sunzilog_irq_chain);
1492 goto out_unregister_driver;
1498 out_unregister_driver:
1499 of_unregister_driver(&zs_driver);
1501 out_unregister_uart:
1503 uart_unregister_driver(&sunzilog_reg);
1504 sunzilog_reg.cons = NULL;
1508 sunzilog_free_tables();
1512 static void __exit sunzilog_exit(void)
1514 of_unregister_driver(&zs_driver);
1516 if (zilog_irq != -1) {
1517 free_irq(zilog_irq, sunzilog_irq_chain);
1522 uart_unregister_driver(&sunzilog_reg);
1523 sunzilog_free_tables();
1527 module_init(sunzilog_init);
1528 module_exit(sunzilog_exit);
1530 MODULE_AUTHOR("David S. Miller");
1531 MODULE_DESCRIPTION("Sun Zilog serial port driver");
1532 MODULE_VERSION("2.0");
1533 MODULE_LICENSE("GPL");