blob: b11f6dea27049858b19f8e4d3be26c610c02033f [file] [log] [blame]
David S. Miller36764632006-06-29 15:13:17 -07001/* sunzilog.c: Zilog serial driver for Sparc systems.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002 *
3 * Driver for Zilog serial chips found on Sun workstations and
4 * servers. This driver could actually be made more generic.
5 *
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
10 * work there.
11 *
David S. Miller36764632006-06-29 15:13:17 -070012 * Copyright (C) 2002, 2006 David S. Miller (davem@davemloft.net)
Linus Torvalds1da177e2005-04-16 15:20:36 -070013 */
14
Linus Torvalds1da177e2005-04-16 15:20:36 -070015#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>
32#ifdef CONFIG_SERIO
33#include <linux/serio.h>
34#endif
35#include <linux/init.h>
36
37#include <asm/io.h>
38#include <asm/irq.h>
David S. Miller36764632006-06-29 15:13:17 -070039#include <asm/prom.h>
40#include <asm/of_device.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070041
42#if defined(CONFIG_SERIAL_SUNZILOG_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
43#define SUPPORT_SYSRQ
44#endif
45
46#include <linux/serial_core.h>
47
48#include "suncore.h"
49#include "sunzilog.h"
50
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
54 * completion.
55 */
56#ifndef CONFIG_SPARC64
57#define ZSDELAY() udelay(5)
58#define ZSDELAY_LONG() udelay(20)
59#define ZS_WSYNC(channel) do { } while (0)
60#else
61#define ZSDELAY()
62#define ZSDELAY_LONG()
63#define ZS_WSYNC(__channel) \
David S. Miller36764632006-06-29 15:13:17 -070064 readb(&((__channel)->control))
Linus Torvalds1da177e2005-04-16 15:20:36 -070065#endif
66
67static int num_sunzilog;
68#define NUM_SUNZILOG num_sunzilog
69#define NUM_CHANNELS (NUM_SUNZILOG * 2)
70
Linus Torvalds1da177e2005-04-16 15:20:36 -070071#define ZS_CLOCK 4915200 /* Zilog input clock rate. */
72#define ZS_CLOCK_DIVISOR 16 /* Divisor this driver uses. */
73
74/*
75 * We wrap our port structure around the generic uart_port.
76 */
77struct uart_sunzilog_port {
78 struct uart_port port;
79
80 /* IRQ servicing chain. */
81 struct uart_sunzilog_port *next;
82
83 /* Current values of Zilog write registers. */
84 unsigned char curregs[NUM_ZSREGS];
85
86 unsigned int flags;
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
96
97 unsigned int cflag;
98
99 unsigned char parity_mask;
100 unsigned char prev_status;
101
102#ifdef CONFIG_SERIO
David S. Miller36764632006-06-29 15:13:17 -0700103 struct serio serio;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104 int serio_open;
105#endif
106};
107
108#define ZILOG_CHANNEL_FROM_PORT(PORT) ((struct zilog_channel __iomem *)((PORT)->membase))
109#define UART_ZILOG(PORT) ((struct uart_sunzilog_port *)(PORT))
110
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)
120
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.
125 *
126 * The port lock must be held and local IRQs must be disabled
127 * when {read,write}_zsreg is invoked.
128 */
129static unsigned char read_zsreg(struct zilog_channel __iomem *channel,
130 unsigned char reg)
131{
132 unsigned char retval;
133
David S. Miller36764632006-06-29 15:13:17 -0700134 writeb(reg, &channel->control);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135 ZSDELAY();
David S. Miller36764632006-06-29 15:13:17 -0700136 retval = readb(&channel->control);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137 ZSDELAY();
138
139 return retval;
140}
141
142static void write_zsreg(struct zilog_channel __iomem *channel,
143 unsigned char reg, unsigned char value)
144{
David S. Miller36764632006-06-29 15:13:17 -0700145 writeb(reg, &channel->control);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146 ZSDELAY();
David S. Miller36764632006-06-29 15:13:17 -0700147 writeb(value, &channel->control);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148 ZSDELAY();
149}
150
151static void sunzilog_clear_fifo(struct zilog_channel __iomem *channel)
152{
153 int i;
154
155 for (i = 0; i < 32; i++) {
156 unsigned char regval;
157
David S. Miller36764632006-06-29 15:13:17 -0700158 regval = readb(&channel->control);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159 ZSDELAY();
160 if (regval & Rx_CH_AV)
161 break;
162
163 regval = read_zsreg(channel, R1);
David S. Miller36764632006-06-29 15:13:17 -0700164 readb(&channel->data);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165 ZSDELAY();
166
167 if (regval & (PAR_ERR | Rx_OVR | CRC_ERR)) {
David S. Miller36764632006-06-29 15:13:17 -0700168 writeb(ERR_RES, &channel->control);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169 ZSDELAY();
170 ZS_WSYNC(channel);
171 }
172 }
173}
174
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.
177 */
178static void __load_zsregs(struct zilog_channel __iomem *channel, unsigned char *regs)
179{
180 int i;
181
182 /* Let pending transmits finish. */
183 for (i = 0; i < 1000; i++) {
184 unsigned char stat = read_zsreg(channel, R1);
185 if (stat & ALL_SNT)
186 break;
187 udelay(100);
188 }
189
David S. Miller36764632006-06-29 15:13:17 -0700190 writeb(ERR_RES, &channel->control);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191 ZSDELAY();
192 ZS_WSYNC(channel);
193
194 sunzilog_clear_fifo(channel);
195
196 /* Disable all interrupts. */
197 write_zsreg(channel, R1,
198 regs[R1] & ~(RxINT_MASK | TxINT_ENAB | EXT_INT_ENAB));
199
200 /* Set parity, sync config, stop bits, and clock divisor. */
201 write_zsreg(channel, R4, regs[R4]);
202
203 /* Set misc. TX/RX control bits. */
204 write_zsreg(channel, R10, regs[R10]);
205
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);
209
210 /* Synchronous mode config. */
211 write_zsreg(channel, R6, regs[R6]);
212 write_zsreg(channel, R7, regs[R7]);
213
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.
217 */
218
219 /* Disable baud generator. */
220 write_zsreg(channel, R14, regs[R14] & ~BRENAB);
221
222 /* Clock mode control. */
223 write_zsreg(channel, R11, regs[R11]);
224
225 /* Lower and upper byte of baud rate generator divisor. */
226 write_zsreg(channel, R12, regs[R12]);
227 write_zsreg(channel, R13, regs[R13]);
228
229 /* Now rewrite R14, with BRENAB (if set). */
230 write_zsreg(channel, R14, regs[R14]);
231
232 /* External status interrupt control. */
233 write_zsreg(channel, R15, regs[R15]);
234
235 /* Reset external status interrupts. */
236 write_zsreg(channel, R0, RES_EXT_INT);
237 write_zsreg(channel, R0, RES_EXT_INT);
238
239 /* Rewrite R3/R5, this time without enables masked. */
240 write_zsreg(channel, R3, regs[R3]);
241 write_zsreg(channel, R5, regs[R5]);
242
243 /* Rewrite R1, this time without IRQ enabled masked. */
244 write_zsreg(channel, R1, regs[R1]);
245}
246
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.
250 *
251 * The UART port lock must be held and local interrupts disabled.
252 */
253static void sunzilog_maybe_update_regs(struct uart_sunzilog_port *up,
254 struct zilog_channel __iomem *channel)
255{
256 if (!ZS_REGS_HELD(up)) {
257 if (ZS_TX_ACTIVE(up)) {
258 up->flags |= SUNZILOG_FLAG_REGS_HELD;
259 } else {
260 __load_zsregs(channel, up->curregs);
261 }
262 }
263}
264
265static void sunzilog_change_mouse_baud(struct uart_sunzilog_port *up)
266{
267 unsigned int cur_cflag = up->cflag;
268 int brg, new_baud;
269
270 up->cflag &= ~CBAUD;
271 up->cflag |= suncore_mouse_baud_cflag_next(cur_cflag, &new_baud);
272
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));
277}
278
279static void sunzilog_kbdms_receive_chars(struct uart_sunzilog_port *up,
David Howells7d12e782006-10-05 14:55:46 +0100280 unsigned char ch, int is_break)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700281{
282 if (ZS_IS_KEYB(up)) {
283 /* Stop-A is handled by drivers/char/keyboard.c now. */
284#ifdef CONFIG_SERIO
285 if (up->serio_open)
David Howells7d12e782006-10-05 14:55:46 +0100286 serio_interrupt(&up->serio, ch, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287#endif
288 } else if (ZS_IS_MOUSE(up)) {
289 int ret = suncore_mouse_baud_detection(ch, is_break);
290
291 switch (ret) {
292 case 2:
293 sunzilog_change_mouse_baud(up);
294 /* fallthru */
295 case 1:
296 break;
297
298 case 0:
299#ifdef CONFIG_SERIO
300 if (up->serio_open)
David Howells7d12e782006-10-05 14:55:46 +0100301 serio_interrupt(&up->serio, ch, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302#endif
303 break;
304 };
305 }
306}
307
308static struct tty_struct *
309sunzilog_receive_chars(struct uart_sunzilog_port *up,
David Howells7d12e782006-10-05 14:55:46 +0100310 struct zilog_channel __iomem *channel)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700311{
312 struct tty_struct *tty;
Alan Cox33f0f882006-01-09 20:54:13 -0800313 unsigned char ch, r1, flag;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314
315 tty = NULL;
316 if (up->port.info != NULL && /* Unopened serial console */
317 up->port.info->tty != NULL) /* Keyboard || mouse */
318 tty = up->port.info->tty;
319
320 for (;;) {
321
322 r1 = read_zsreg(channel, R1);
323 if (r1 & (PAR_ERR | Rx_OVR | CRC_ERR)) {
David S. Miller36764632006-06-29 15:13:17 -0700324 writeb(ERR_RES, &channel->control);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700325 ZSDELAY();
326 ZS_WSYNC(channel);
327 }
328
David S. Miller36764632006-06-29 15:13:17 -0700329 ch = readb(&channel->control);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700330 ZSDELAY();
331
332 /* This funny hack depends upon BRK_ABRT not interfering
333 * with the other bits we care about in R1.
334 */
335 if (ch & BRK_ABRT)
336 r1 |= BRK_ABRT;
337
338 if (!(ch & Rx_CH_AV))
339 break;
340
David S. Miller36764632006-06-29 15:13:17 -0700341 ch = readb(&channel->data);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700342 ZSDELAY();
343
344 ch &= up->parity_mask;
345
346 if (unlikely(ZS_IS_KEYB(up)) || unlikely(ZS_IS_MOUSE(up))) {
David Howells7d12e782006-10-05 14:55:46 +0100347 sunzilog_kbdms_receive_chars(up, ch, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348 continue;
349 }
350
351 if (tty == NULL) {
David Howells7d12e782006-10-05 14:55:46 +0100352 uart_handle_sysrq_char(&up->port, ch);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700353 continue;
354 }
355
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356 /* A real serial line, record the character and status. */
Alan Cox33f0f882006-01-09 20:54:13 -0800357 flag = TTY_NORMAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700358 up->port.icount.rx++;
359 if (r1 & (BRK_ABRT | PAR_ERR | Rx_OVR | CRC_ERR)) {
360 if (r1 & BRK_ABRT) {
361 r1 &= ~(PAR_ERR | CRC_ERR);
362 up->port.icount.brk++;
363 if (uart_handle_break(&up->port))
364 continue;
365 }
366 else if (r1 & PAR_ERR)
367 up->port.icount.parity++;
368 else if (r1 & CRC_ERR)
369 up->port.icount.frame++;
370 if (r1 & Rx_OVR)
371 up->port.icount.overrun++;
372 r1 &= up->port.read_status_mask;
373 if (r1 & BRK_ABRT)
Alan Cox33f0f882006-01-09 20:54:13 -0800374 flag = TTY_BREAK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375 else if (r1 & PAR_ERR)
Alan Cox33f0f882006-01-09 20:54:13 -0800376 flag = TTY_PARITY;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700377 else if (r1 & CRC_ERR)
Alan Cox33f0f882006-01-09 20:54:13 -0800378 flag = TTY_FRAME;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700379 }
David Howells7d12e782006-10-05 14:55:46 +0100380 if (uart_handle_sysrq_char(&up->port, ch))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700381 continue;
382
383 if (up->port.ignore_status_mask == 0xff ||
384 (r1 & up->port.ignore_status_mask) == 0) {
Alan Cox33f0f882006-01-09 20:54:13 -0800385 tty_insert_flip_char(tty, ch, flag);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700386 }
Alan Cox33f0f882006-01-09 20:54:13 -0800387 if (r1 & Rx_OVR)
388 tty_insert_flip_char(tty, 0, TTY_OVERRUN);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700389 }
390
391 return tty;
392}
393
394static void sunzilog_status_handle(struct uart_sunzilog_port *up,
David Howells7d12e782006-10-05 14:55:46 +0100395 struct zilog_channel __iomem *channel)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700396{
397 unsigned char status;
398
David S. Miller36764632006-06-29 15:13:17 -0700399 status = readb(&channel->control);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700400 ZSDELAY();
401
David S. Miller36764632006-06-29 15:13:17 -0700402 writeb(RES_EXT_INT, &channel->control);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700403 ZSDELAY();
404 ZS_WSYNC(channel);
405
406 if (status & BRK_ABRT) {
407 if (ZS_IS_MOUSE(up))
David Howells7d12e782006-10-05 14:55:46 +0100408 sunzilog_kbdms_receive_chars(up, 0, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700409 if (ZS_IS_CONS(up)) {
410 /* Wait for BREAK to deassert to avoid potentially
411 * confusing the PROM.
412 */
413 while (1) {
David S. Miller36764632006-06-29 15:13:17 -0700414 status = readb(&channel->control);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700415 ZSDELAY();
416 if (!(status & BRK_ABRT))
417 break;
418 }
419 sun_do_break();
420 return;
421 }
422 }
423
424 if (ZS_WANTS_MODEM_STATUS(up)) {
425 if (status & SYNC)
426 up->port.icount.dsr++;
427
428 /* The Zilog just gives us an interrupt when DCD/CTS/etc. change.
429 * But it does not tell us which bit has changed, we have to keep
430 * track of this ourselves.
431 */
432 if ((status ^ up->prev_status) ^ DCD)
433 uart_handle_dcd_change(&up->port,
434 (status & DCD));
435 if ((status ^ up->prev_status) ^ CTS)
436 uart_handle_cts_change(&up->port,
437 (status & CTS));
438
439 wake_up_interruptible(&up->port.info->delta_msr_wait);
440 }
441
442 up->prev_status = status;
443}
444
445static void sunzilog_transmit_chars(struct uart_sunzilog_port *up,
446 struct zilog_channel __iomem *channel)
447{
448 struct circ_buf *xmit;
449
450 if (ZS_IS_CONS(up)) {
David S. Miller36764632006-06-29 15:13:17 -0700451 unsigned char status = readb(&channel->control);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700452 ZSDELAY();
453
454 /* TX still busy? Just wait for the next TX done interrupt.
455 *
456 * It can occur because of how we do serial console writes. It would
457 * be nice to transmit console writes just like we normally would for
458 * a TTY line. (ie. buffered and TX interrupt driven). That is not
459 * easy because console writes cannot sleep. One solution might be
460 * to poll on enough port->xmit space becomming free. -DaveM
461 */
462 if (!(status & Tx_BUF_EMP))
463 return;
464 }
465
466 up->flags &= ~SUNZILOG_FLAG_TX_ACTIVE;
467
468 if (ZS_REGS_HELD(up)) {
469 __load_zsregs(channel, up->curregs);
470 up->flags &= ~SUNZILOG_FLAG_REGS_HELD;
471 }
472
473 if (ZS_TX_STOPPED(up)) {
474 up->flags &= ~SUNZILOG_FLAG_TX_STOPPED;
475 goto ack_tx_int;
476 }
477
478 if (up->port.x_char) {
479 up->flags |= SUNZILOG_FLAG_TX_ACTIVE;
David S. Miller36764632006-06-29 15:13:17 -0700480 writeb(up->port.x_char, &channel->data);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700481 ZSDELAY();
482 ZS_WSYNC(channel);
483
484 up->port.icount.tx++;
485 up->port.x_char = 0;
486 return;
487 }
488
489 if (up->port.info == NULL)
490 goto ack_tx_int;
491 xmit = &up->port.info->xmit;
David S. Millerb8df1102005-10-10 20:43:22 -0700492 if (uart_circ_empty(xmit))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700493 goto ack_tx_int;
David S. Millerb8df1102005-10-10 20:43:22 -0700494
Linus Torvalds1da177e2005-04-16 15:20:36 -0700495 if (uart_tx_stopped(&up->port))
496 goto ack_tx_int;
497
498 up->flags |= SUNZILOG_FLAG_TX_ACTIVE;
David S. Miller36764632006-06-29 15:13:17 -0700499 writeb(xmit->buf[xmit->tail], &channel->data);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700500 ZSDELAY();
501 ZS_WSYNC(channel);
502
503 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
504 up->port.icount.tx++;
505
506 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
507 uart_write_wakeup(&up->port);
508
509 return;
510
511ack_tx_int:
David S. Miller36764632006-06-29 15:13:17 -0700512 writeb(RES_Tx_P, &channel->control);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700513 ZSDELAY();
514 ZS_WSYNC(channel);
515}
516
David Howells7d12e782006-10-05 14:55:46 +0100517static irqreturn_t sunzilog_interrupt(int irq, void *dev_id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700518{
519 struct uart_sunzilog_port *up = dev_id;
520
521 while (up) {
522 struct zilog_channel __iomem *channel
523 = ZILOG_CHANNEL_FROM_PORT(&up->port);
524 struct tty_struct *tty;
525 unsigned char r3;
526
527 spin_lock(&up->port.lock);
528 r3 = read_zsreg(channel, R3);
529
530 /* Channel A */
531 tty = NULL;
532 if (r3 & (CHAEXT | CHATxIP | CHARxIP)) {
David S. Miller36764632006-06-29 15:13:17 -0700533 writeb(RES_H_IUS, &channel->control);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700534 ZSDELAY();
535 ZS_WSYNC(channel);
536
537 if (r3 & CHARxIP)
David Howells7d12e782006-10-05 14:55:46 +0100538 tty = sunzilog_receive_chars(up, channel);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700539 if (r3 & CHAEXT)
David Howells7d12e782006-10-05 14:55:46 +0100540 sunzilog_status_handle(up, channel);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700541 if (r3 & CHATxIP)
542 sunzilog_transmit_chars(up, channel);
543 }
544 spin_unlock(&up->port.lock);
545
546 if (tty)
547 tty_flip_buffer_push(tty);
548
549 /* Channel B */
550 up = up->next;
551 channel = ZILOG_CHANNEL_FROM_PORT(&up->port);
552
553 spin_lock(&up->port.lock);
554 tty = NULL;
555 if (r3 & (CHBEXT | CHBTxIP | CHBRxIP)) {
David S. Miller36764632006-06-29 15:13:17 -0700556 writeb(RES_H_IUS, &channel->control);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700557 ZSDELAY();
558 ZS_WSYNC(channel);
559
560 if (r3 & CHBRxIP)
David Howells7d12e782006-10-05 14:55:46 +0100561 tty = sunzilog_receive_chars(up, channel);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700562 if (r3 & CHBEXT)
David Howells7d12e782006-10-05 14:55:46 +0100563 sunzilog_status_handle(up, channel);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700564 if (r3 & CHBTxIP)
565 sunzilog_transmit_chars(up, channel);
566 }
567 spin_unlock(&up->port.lock);
568
569 if (tty)
570 tty_flip_buffer_push(tty);
571
572 up = up->next;
573 }
574
575 return IRQ_HANDLED;
576}
577
578/* A convenient way to quickly get R0 status. The caller must _not_ hold the
579 * port lock, it is acquired here.
580 */
581static __inline__ unsigned char sunzilog_read_channel_status(struct uart_port *port)
582{
583 struct zilog_channel __iomem *channel;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700584 unsigned char status;
585
Linus Torvalds1da177e2005-04-16 15:20:36 -0700586 channel = ZILOG_CHANNEL_FROM_PORT(port);
David S. Miller36764632006-06-29 15:13:17 -0700587 status = readb(&channel->control);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700588 ZSDELAY();
589
Linus Torvalds1da177e2005-04-16 15:20:36 -0700590 return status;
591}
592
593/* The port lock is not held. */
594static unsigned int sunzilog_tx_empty(struct uart_port *port)
595{
Russell Kingc5f46442005-06-29 09:42:38 +0100596 unsigned long flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700597 unsigned char status;
598 unsigned int ret;
599
Russell Kingc5f46442005-06-29 09:42:38 +0100600 spin_lock_irqsave(&port->lock, flags);
601
Linus Torvalds1da177e2005-04-16 15:20:36 -0700602 status = sunzilog_read_channel_status(port);
Russell Kingc5f46442005-06-29 09:42:38 +0100603
604 spin_unlock_irqrestore(&port->lock, flags);
605
Linus Torvalds1da177e2005-04-16 15:20:36 -0700606 if (status & Tx_BUF_EMP)
607 ret = TIOCSER_TEMT;
608 else
609 ret = 0;
610
611 return ret;
612}
613
Russell Kingc5f46442005-06-29 09:42:38 +0100614/* The port lock is held and interrupts are disabled. */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700615static unsigned int sunzilog_get_mctrl(struct uart_port *port)
616{
617 unsigned char status;
618 unsigned int ret;
619
620 status = sunzilog_read_channel_status(port);
621
622 ret = 0;
623 if (status & DCD)
624 ret |= TIOCM_CAR;
625 if (status & SYNC)
626 ret |= TIOCM_DSR;
627 if (status & CTS)
628 ret |= TIOCM_CTS;
629
630 return ret;
631}
632
633/* The port lock is held and interrupts are disabled. */
634static void sunzilog_set_mctrl(struct uart_port *port, unsigned int mctrl)
635{
636 struct uart_sunzilog_port *up = (struct uart_sunzilog_port *) port;
637 struct zilog_channel __iomem *channel = ZILOG_CHANNEL_FROM_PORT(port);
638 unsigned char set_bits, clear_bits;
639
640 set_bits = clear_bits = 0;
641
642 if (mctrl & TIOCM_RTS)
643 set_bits |= RTS;
644 else
645 clear_bits |= RTS;
646 if (mctrl & TIOCM_DTR)
647 set_bits |= DTR;
648 else
649 clear_bits |= DTR;
650
651 /* NOTE: Not subject to 'transmitter active' rule. */
652 up->curregs[R5] |= set_bits;
653 up->curregs[R5] &= ~clear_bits;
654 write_zsreg(channel, R5, up->curregs[R5]);
655}
656
657/* The port lock is held and interrupts are disabled. */
Russell Kingb129a8c2005-08-31 10:12:14 +0100658static void sunzilog_stop_tx(struct uart_port *port)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700659{
660 struct uart_sunzilog_port *up = (struct uart_sunzilog_port *) port;
661
662 up->flags |= SUNZILOG_FLAG_TX_STOPPED;
663}
664
665/* The port lock is held and interrupts are disabled. */
Russell Kingb129a8c2005-08-31 10:12:14 +0100666static void sunzilog_start_tx(struct uart_port *port)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700667{
668 struct uart_sunzilog_port *up = (struct uart_sunzilog_port *) port;
669 struct zilog_channel __iomem *channel = ZILOG_CHANNEL_FROM_PORT(port);
670 unsigned char status;
671
672 up->flags |= SUNZILOG_FLAG_TX_ACTIVE;
673 up->flags &= ~SUNZILOG_FLAG_TX_STOPPED;
674
David S. Miller36764632006-06-29 15:13:17 -0700675 status = readb(&channel->control);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700676 ZSDELAY();
677
678 /* TX busy? Just wait for the TX done interrupt. */
679 if (!(status & Tx_BUF_EMP))
680 return;
681
682 /* Send the first character to jump-start the TX done
683 * IRQ sending engine.
684 */
685 if (port->x_char) {
David S. Miller36764632006-06-29 15:13:17 -0700686 writeb(port->x_char, &channel->data);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700687 ZSDELAY();
688 ZS_WSYNC(channel);
689
690 port->icount.tx++;
691 port->x_char = 0;
692 } else {
693 struct circ_buf *xmit = &port->info->xmit;
694
David S. Miller36764632006-06-29 15:13:17 -0700695 writeb(xmit->buf[xmit->tail], &channel->data);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700696 ZSDELAY();
697 ZS_WSYNC(channel);
698
699 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
700 port->icount.tx++;
701
702 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
703 uart_write_wakeup(&up->port);
704 }
705}
706
707/* The port lock is held. */
708static void sunzilog_stop_rx(struct uart_port *port)
709{
710 struct uart_sunzilog_port *up = UART_ZILOG(port);
711 struct zilog_channel __iomem *channel;
712
713 if (ZS_IS_CONS(up))
714 return;
715
716 channel = ZILOG_CHANNEL_FROM_PORT(port);
717
718 /* Disable all RX interrupts. */
719 up->curregs[R1] &= ~RxINT_MASK;
720 sunzilog_maybe_update_regs(up, channel);
721}
722
723/* The port lock is held. */
724static void sunzilog_enable_ms(struct uart_port *port)
725{
726 struct uart_sunzilog_port *up = (struct uart_sunzilog_port *) port;
727 struct zilog_channel __iomem *channel = ZILOG_CHANNEL_FROM_PORT(port);
728 unsigned char new_reg;
729
730 new_reg = up->curregs[R15] | (DCDIE | SYNCIE | CTSIE);
731 if (new_reg != up->curregs[R15]) {
732 up->curregs[R15] = new_reg;
733
734 /* NOTE: Not subject to 'transmitter active' rule. */
735 write_zsreg(channel, R15, up->curregs[R15]);
736 }
737}
738
739/* The port lock is not held. */
740static void sunzilog_break_ctl(struct uart_port *port, int break_state)
741{
742 struct uart_sunzilog_port *up = (struct uart_sunzilog_port *) port;
743 struct zilog_channel __iomem *channel = ZILOG_CHANNEL_FROM_PORT(port);
744 unsigned char set_bits, clear_bits, new_reg;
745 unsigned long flags;
746
747 set_bits = clear_bits = 0;
748
749 if (break_state)
750 set_bits |= SND_BRK;
751 else
752 clear_bits |= SND_BRK;
753
754 spin_lock_irqsave(&port->lock, flags);
755
756 new_reg = (up->curregs[R5] | set_bits) & ~clear_bits;
757 if (new_reg != up->curregs[R5]) {
758 up->curregs[R5] = new_reg;
759
760 /* NOTE: Not subject to 'transmitter active' rule. */
761 write_zsreg(channel, R5, up->curregs[R5]);
762 }
763
764 spin_unlock_irqrestore(&port->lock, flags);
765}
766
767static void __sunzilog_startup(struct uart_sunzilog_port *up)
768{
769 struct zilog_channel __iomem *channel;
770
771 channel = ZILOG_CHANNEL_FROM_PORT(&up->port);
David S. Miller36764632006-06-29 15:13:17 -0700772 up->prev_status = readb(&channel->control);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700773
774 /* Enable receiver and transmitter. */
775 up->curregs[R3] |= RxENAB;
776 up->curregs[R5] |= TxENAB;
777
778 up->curregs[R1] |= EXT_INT_ENAB | INT_ALL_Rx | TxINT_ENAB;
779 sunzilog_maybe_update_regs(up, channel);
780}
781
782static int sunzilog_startup(struct uart_port *port)
783{
784 struct uart_sunzilog_port *up = UART_ZILOG(port);
785 unsigned long flags;
786
787 if (ZS_IS_CONS(up))
788 return 0;
789
790 spin_lock_irqsave(&port->lock, flags);
791 __sunzilog_startup(up);
792 spin_unlock_irqrestore(&port->lock, flags);
793 return 0;
794}
795
796/*
797 * The test for ZS_IS_CONS is explained by the following e-mail:
798 *****
799 * From: Russell King <rmk@arm.linux.org.uk>
800 * Date: Sun, 8 Dec 2002 10:18:38 +0000
801 *
802 * On Sun, Dec 08, 2002 at 02:43:36AM -0500, Pete Zaitcev wrote:
803 * > I boot my 2.5 boxes using "console=ttyS0,9600" argument,
804 * > and I noticed that something is not right with reference
805 * > counting in this case. It seems that when the console
806 * > is open by kernel initially, this is not accounted
807 * > as an open, and uart_startup is not called.
808 *
809 * That is correct. We are unable to call uart_startup when the serial
810 * console is initialised because it may need to allocate memory (as
811 * request_irq does) and the memory allocators may not have been
812 * initialised.
813 *
814 * 1. initialise the port into a state where it can send characters in the
815 * console write method.
816 *
817 * 2. don't do the actual hardware shutdown in your shutdown() method (but
818 * do the normal software shutdown - ie, free irqs etc)
819 *****
820 */
821static void sunzilog_shutdown(struct uart_port *port)
822{
823 struct uart_sunzilog_port *up = UART_ZILOG(port);
824 struct zilog_channel __iomem *channel;
825 unsigned long flags;
826
827 if (ZS_IS_CONS(up))
828 return;
829
830 spin_lock_irqsave(&port->lock, flags);
831
832 channel = ZILOG_CHANNEL_FROM_PORT(port);
833
834 /* Disable receiver and transmitter. */
835 up->curregs[R3] &= ~RxENAB;
836 up->curregs[R5] &= ~TxENAB;
837
838 /* Disable all interrupts and BRK assertion. */
839 up->curregs[R1] &= ~(EXT_INT_ENAB | TxINT_ENAB | RxINT_MASK);
840 up->curregs[R5] &= ~SND_BRK;
841 sunzilog_maybe_update_regs(up, channel);
842
843 spin_unlock_irqrestore(&port->lock, flags);
844}
845
846/* Shared by TTY driver and serial console setup. The port lock is held
847 * and local interrupts are disabled.
848 */
849static void
850sunzilog_convert_to_zs(struct uart_sunzilog_port *up, unsigned int cflag,
851 unsigned int iflag, int brg)
852{
853
854 up->curregs[R10] = NRZ;
855 up->curregs[R11] = TCBR | RCBR;
856
857 /* Program BAUD and clock source. */
858 up->curregs[R4] &= ~XCLK_MASK;
859 up->curregs[R4] |= X16CLK;
860 up->curregs[R12] = brg & 0xff;
861 up->curregs[R13] = (brg >> 8) & 0xff;
862 up->curregs[R14] = BRSRC | BRENAB;
863
864 /* Character size, stop bits, and parity. */
865 up->curregs[3] &= ~RxN_MASK;
866 up->curregs[5] &= ~TxN_MASK;
867 switch (cflag & CSIZE) {
868 case CS5:
869 up->curregs[3] |= Rx5;
870 up->curregs[5] |= Tx5;
871 up->parity_mask = 0x1f;
872 break;
873 case CS6:
874 up->curregs[3] |= Rx6;
875 up->curregs[5] |= Tx6;
876 up->parity_mask = 0x3f;
877 break;
878 case CS7:
879 up->curregs[3] |= Rx7;
880 up->curregs[5] |= Tx7;
881 up->parity_mask = 0x7f;
882 break;
883 case CS8:
884 default:
885 up->curregs[3] |= Rx8;
886 up->curregs[5] |= Tx8;
887 up->parity_mask = 0xff;
888 break;
889 };
890 up->curregs[4] &= ~0x0c;
891 if (cflag & CSTOPB)
892 up->curregs[4] |= SB2;
893 else
894 up->curregs[4] |= SB1;
895 if (cflag & PARENB)
896 up->curregs[4] |= PAR_ENAB;
897 else
898 up->curregs[4] &= ~PAR_ENAB;
899 if (!(cflag & PARODD))
900 up->curregs[4] |= PAR_EVEN;
901 else
902 up->curregs[4] &= ~PAR_EVEN;
903
904 up->port.read_status_mask = Rx_OVR;
905 if (iflag & INPCK)
906 up->port.read_status_mask |= CRC_ERR | PAR_ERR;
907 if (iflag & (BRKINT | PARMRK))
908 up->port.read_status_mask |= BRK_ABRT;
909
910 up->port.ignore_status_mask = 0;
911 if (iflag & IGNPAR)
912 up->port.ignore_status_mask |= CRC_ERR | PAR_ERR;
913 if (iflag & IGNBRK) {
914 up->port.ignore_status_mask |= BRK_ABRT;
915 if (iflag & IGNPAR)
916 up->port.ignore_status_mask |= Rx_OVR;
917 }
918
919 if ((cflag & CREAD) == 0)
920 up->port.ignore_status_mask = 0xff;
921}
922
923/* The port lock is not held. */
924static void
925sunzilog_set_termios(struct uart_port *port, struct termios *termios,
926 struct termios *old)
927{
928 struct uart_sunzilog_port *up = (struct uart_sunzilog_port *) port;
929 unsigned long flags;
930 int baud, brg;
931
932 baud = uart_get_baud_rate(port, termios, old, 1200, 76800);
933
934 spin_lock_irqsave(&up->port.lock, flags);
935
936 brg = BPS_TO_BRG(baud, ZS_CLOCK / ZS_CLOCK_DIVISOR);
937
938 sunzilog_convert_to_zs(up, termios->c_cflag, termios->c_iflag, brg);
939
940 if (UART_ENABLE_MS(&up->port, termios->c_cflag))
941 up->flags |= SUNZILOG_FLAG_MODEM_STATUS;
942 else
943 up->flags &= ~SUNZILOG_FLAG_MODEM_STATUS;
944
945 up->cflag = termios->c_cflag;
946
947 sunzilog_maybe_update_regs(up, ZILOG_CHANNEL_FROM_PORT(port));
948
949 uart_update_timeout(port, termios->c_cflag, baud);
950
951 spin_unlock_irqrestore(&up->port.lock, flags);
952}
953
954static const char *sunzilog_type(struct uart_port *port)
955{
David S. Miller36764632006-06-29 15:13:17 -0700956 return "zs";
Linus Torvalds1da177e2005-04-16 15:20:36 -0700957}
958
959/* We do not request/release mappings of the registers here, this
960 * happens at early serial probe time.
961 */
962static void sunzilog_release_port(struct uart_port *port)
963{
964}
965
966static int sunzilog_request_port(struct uart_port *port)
967{
968 return 0;
969}
970
971/* These do not need to do anything interesting either. */
972static void sunzilog_config_port(struct uart_port *port, int flags)
973{
974}
975
976/* We do not support letting the user mess with the divisor, IRQ, etc. */
977static int sunzilog_verify_port(struct uart_port *port, struct serial_struct *ser)
978{
979 return -EINVAL;
980}
981
982static struct uart_ops sunzilog_pops = {
983 .tx_empty = sunzilog_tx_empty,
984 .set_mctrl = sunzilog_set_mctrl,
985 .get_mctrl = sunzilog_get_mctrl,
986 .stop_tx = sunzilog_stop_tx,
987 .start_tx = sunzilog_start_tx,
988 .stop_rx = sunzilog_stop_rx,
989 .enable_ms = sunzilog_enable_ms,
990 .break_ctl = sunzilog_break_ctl,
991 .startup = sunzilog_startup,
992 .shutdown = sunzilog_shutdown,
993 .set_termios = sunzilog_set_termios,
994 .type = sunzilog_type,
995 .release_port = sunzilog_release_port,
996 .request_port = sunzilog_request_port,
997 .config_port = sunzilog_config_port,
998 .verify_port = sunzilog_verify_port,
999};
1000
1001static struct uart_sunzilog_port *sunzilog_port_table;
1002static struct zilog_layout __iomem **sunzilog_chip_regs;
1003
1004static struct uart_sunzilog_port *sunzilog_irq_chain;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001005
1006static struct uart_driver sunzilog_reg = {
1007 .owner = THIS_MODULE,
1008 .driver_name = "ttyS",
Linus Torvalds1da177e2005-04-16 15:20:36 -07001009 .dev_name = "ttyS",
1010 .major = TTY_MAJOR,
1011};
1012
David S. Miller36764632006-06-29 15:13:17 -07001013static int __init sunzilog_alloc_tables(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001014{
David S. Miller36764632006-06-29 15:13:17 -07001015 struct uart_sunzilog_port *up;
1016 unsigned long size;
1017 int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001018
David S. Miller36764632006-06-29 15:13:17 -07001019 size = NUM_CHANNELS * sizeof(struct uart_sunzilog_port);
1020 sunzilog_port_table = kzalloc(size, GFP_KERNEL);
1021 if (!sunzilog_port_table)
1022 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001023
David S. Miller36764632006-06-29 15:13:17 -07001024 for (i = 0; i < NUM_CHANNELS; i++) {
1025 up = &sunzilog_port_table[i];
1026
1027 spin_lock_init(&up->port.lock);
1028
1029 if (i == 0)
1030 sunzilog_irq_chain = up;
1031
1032 if (i < NUM_CHANNELS - 1)
1033 up->next = up + 1;
1034 else
1035 up->next = NULL;
1036 }
1037
1038 size = NUM_SUNZILOG * sizeof(struct zilog_layout __iomem *);
1039 sunzilog_chip_regs = kzalloc(size, GFP_KERNEL);
1040 if (!sunzilog_chip_regs) {
1041 kfree(sunzilog_port_table);
1042 sunzilog_irq_chain = NULL;
1043 return -ENOMEM;
1044 }
1045
1046 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001047}
1048
David S. Miller36764632006-06-29 15:13:17 -07001049static void sunzilog_free_tables(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001050{
David S. Miller36764632006-06-29 15:13:17 -07001051 kfree(sunzilog_port_table);
1052 sunzilog_irq_chain = NULL;
1053 kfree(sunzilog_chip_regs);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001054}
1055
1056#define ZS_PUT_CHAR_MAX_DELAY 2000 /* 10 ms */
1057
Russell Kingd3587882006-03-20 20:00:09 +00001058static void sunzilog_putchar(struct uart_port *port, int ch)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001059{
Russell Kingd3587882006-03-20 20:00:09 +00001060 struct zilog_channel *channel = ZILOG_CHANNEL_FROM_PORT(port);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001061 int loops = ZS_PUT_CHAR_MAX_DELAY;
1062
1063 /* This is a timed polling loop so do not switch the explicit
1064 * udelay with ZSDELAY as that is a NOP on some platforms. -DaveM
1065 */
1066 do {
David S. Miller36764632006-06-29 15:13:17 -07001067 unsigned char val = readb(&channel->control);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001068 if (val & Tx_BUF_EMP) {
1069 ZSDELAY();
1070 break;
1071 }
1072 udelay(5);
1073 } while (--loops);
1074
David S. Miller36764632006-06-29 15:13:17 -07001075 writeb(ch, &channel->data);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001076 ZSDELAY();
1077 ZS_WSYNC(channel);
1078}
1079
1080#ifdef CONFIG_SERIO
1081
1082static DEFINE_SPINLOCK(sunzilog_serio_lock);
1083
1084static int sunzilog_serio_write(struct serio *serio, unsigned char ch)
1085{
1086 struct uart_sunzilog_port *up = serio->port_data;
1087 unsigned long flags;
1088
1089 spin_lock_irqsave(&sunzilog_serio_lock, flags);
1090
Russell Kingd3587882006-03-20 20:00:09 +00001091 sunzilog_putchar(&up->port, ch);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001092
1093 spin_unlock_irqrestore(&sunzilog_serio_lock, flags);
1094
1095 return 0;
1096}
1097
1098static int sunzilog_serio_open(struct serio *serio)
1099{
1100 struct uart_sunzilog_port *up = serio->port_data;
1101 unsigned long flags;
1102 int ret;
1103
1104 spin_lock_irqsave(&sunzilog_serio_lock, flags);
1105 if (!up->serio_open) {
1106 up->serio_open = 1;
1107 ret = 0;
1108 } else
1109 ret = -EBUSY;
1110 spin_unlock_irqrestore(&sunzilog_serio_lock, flags);
1111
1112 return ret;
1113}
1114
1115static void sunzilog_serio_close(struct serio *serio)
1116{
1117 struct uart_sunzilog_port *up = serio->port_data;
1118 unsigned long flags;
1119
1120 spin_lock_irqsave(&sunzilog_serio_lock, flags);
1121 up->serio_open = 0;
1122 spin_unlock_irqrestore(&sunzilog_serio_lock, flags);
1123}
1124
1125#endif /* CONFIG_SERIO */
1126
1127#ifdef CONFIG_SERIAL_SUNZILOG_CONSOLE
1128static void
1129sunzilog_console_write(struct console *con, const char *s, unsigned int count)
1130{
1131 struct uart_sunzilog_port *up = &sunzilog_port_table[con->index];
Linus Torvalds1da177e2005-04-16 15:20:36 -07001132 unsigned long flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001133
1134 spin_lock_irqsave(&up->port.lock, flags);
Russell Kingd3587882006-03-20 20:00:09 +00001135 uart_console_write(&up->port, s, count, sunzilog_putchar);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001136 udelay(2);
1137 spin_unlock_irqrestore(&up->port.lock, flags);
1138}
1139
1140static int __init sunzilog_console_setup(struct console *con, char *options)
1141{
1142 struct uart_sunzilog_port *up = &sunzilog_port_table[con->index];
1143 unsigned long flags;
1144 int baud, brg;
1145
David S. Millerb8b99e82006-08-23 15:53:39 -07001146 if (up->port.type != PORT_SUNZILOG)
1147 return -1;
1148
Linus Torvalds1da177e2005-04-16 15:20:36 -07001149 printk(KERN_INFO "Console: ttyS%d (SunZilog zs%d)\n",
1150 (sunzilog_reg.minor - 64) + con->index, con->index);
1151
1152 /* Get firmware console settings. */
1153 sunserial_console_termios(con);
1154
1155 /* Firmware console speed is limited to 150-->38400 baud so
1156 * this hackish cflag thing is OK.
1157 */
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;
1168 };
1169
1170 brg = BPS_TO_BRG(baud, ZS_CLOCK / ZS_CLOCK_DIVISOR);
1171
1172 spin_lock_irqsave(&up->port.lock, flags);
1173
1174 up->curregs[R15] = BRKIE;
1175 sunzilog_convert_to_zs(up, con->cflag, 0, brg);
1176
1177 sunzilog_set_mctrl(&up->port, TIOCM_DTR | TIOCM_RTS);
1178 __sunzilog_startup(up);
1179
1180 spin_unlock_irqrestore(&up->port.lock, flags);
1181
1182 return 0;
1183}
1184
1185static struct console sunzilog_console = {
1186 .name = "ttyS",
1187 .write = sunzilog_console_write,
1188 .device = uart_console_device,
1189 .setup = sunzilog_console_setup,
1190 .flags = CON_PRINTBUFFER,
1191 .index = -1,
1192 .data = &sunzilog_reg,
1193};
Linus Torvalds1da177e2005-04-16 15:20:36 -07001194
David S. Miller1ddb7c92006-02-13 20:09:10 -08001195static inline struct console *SUNZILOG_CONSOLE(void)
1196{
1197 int i;
1198
1199 if (con_is_present())
1200 return NULL;
1201
1202 for (i = 0; i < NUM_CHANNELS; i++) {
1203 int this_minor = sunzilog_reg.minor + i;
1204
1205 if ((this_minor - 64) == (serial_console - 1))
1206 break;
1207 }
1208 if (i == NUM_CHANNELS)
1209 return NULL;
1210
1211 sunzilog_console.index = i;
1212 sunzilog_port_table[i].flags |= SUNZILOG_FLAG_IS_CONS;
1213
1214 return &sunzilog_console;
1215}
1216
Linus Torvalds1da177e2005-04-16 15:20:36 -07001217#else
David S. Miller1ddb7c92006-02-13 20:09:10 -08001218#define SUNZILOG_CONSOLE() (NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001219#endif
1220
Linus Torvalds1da177e2005-04-16 15:20:36 -07001221static void __init sunzilog_init_kbdms(struct uart_sunzilog_port *up, int channel)
1222{
1223 int baud, brg;
1224
David S. Miller8a84eb12006-07-19 22:55:08 -07001225 if (up->flags & SUNZILOG_FLAG_CONS_KEYB) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001226 up->cflag = B1200 | CS8 | CLOCAL | CREAD;
1227 baud = 1200;
1228 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001229 up->cflag = B4800 | CS8 | CLOCAL | CREAD;
1230 baud = 4800;
1231 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001232
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);
1238}
1239
1240#ifdef CONFIG_SERIO
David S. Miller8a84eb12006-07-19 22:55:08 -07001241static void __init sunzilog_register_serio(struct uart_sunzilog_port *up)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001242{
David S. Miller36764632006-06-29 15:13:17 -07001243 struct serio *serio = &up->serio;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001244
David S. Miller36764632006-06-29 15:13:17 -07001245 serio->port_data = up;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001246
David S. Miller36764632006-06-29 15:13:17 -07001247 serio->id.type = SERIO_RS232;
David S. Miller8a84eb12006-07-19 22:55:08 -07001248 if (up->flags & SUNZILOG_FLAG_CONS_KEYB) {
David S. Miller36764632006-06-29 15:13:17 -07001249 serio->id.proto = SERIO_SUNKBD;
1250 strlcpy(serio->name, "zskbd", sizeof(serio->name));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001251 } else {
David S. Miller36764632006-06-29 15:13:17 -07001252 serio->id.proto = SERIO_SUN;
1253 serio->id.extra = 1;
1254 strlcpy(serio->name, "zsms", sizeof(serio->name));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001255 }
David S. Miller36764632006-06-29 15:13:17 -07001256 strlcpy(serio->phys,
David S. Miller8a84eb12006-07-19 22:55:08 -07001257 ((up->flags & SUNZILOG_FLAG_CONS_KEYB) ?
1258 "zs/serio0" : "zs/serio1"),
David S. Miller36764632006-06-29 15:13:17 -07001259 sizeof(serio->phys));
1260
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;
1265
1266 serio_register_port(serio);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001267}
1268#endif
1269
David S. Millerfbe96f92006-09-27 19:52:35 -07001270static void __devinit sunzilog_init_hw(struct uart_sunzilog_port *up)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001271{
David S. Miller36764632006-06-29 15:13:17 -07001272 struct zilog_channel __iomem *channel;
1273 unsigned long flags;
1274 int baud, brg;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001275
David S. Miller36764632006-06-29 15:13:17 -07001276 channel = ZILOG_CHANNEL_FROM_PORT(&up->port);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001277
David S. Miller36764632006-06-29 15:13:17 -07001278 spin_lock_irqsave(&up->port.lock, flags);
1279 if (ZS_IS_CHANNEL_A(up)) {
1280 write_zsreg(channel, R9, FHWRES);
1281 ZSDELAY_LONG();
1282 (void) read_zsreg(channel, R0);
1283 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001284
David S. Miller8a84eb12006-07-19 22:55:08 -07001285 if (up->flags & (SUNZILOG_FLAG_CONS_KEYB |
1286 SUNZILOG_FLAG_CONS_MOUSE)) {
David S. Miller36764632006-06-29 15:13:17 -07001287 sunzilog_init_kbdms(up, up->port.line);
1288 up->curregs[R9] |= (NV | MIE);
1289 write_zsreg(channel, R9, up->curregs[R9]);
1290 } else {
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;
1300 baud = 9600;
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]);
1307 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001308
David S. Miller36764632006-06-29 15:13:17 -07001309 spin_unlock_irqrestore(&up->port.lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001310
1311#ifdef CONFIG_SERIO
David S. Miller8a84eb12006-07-19 22:55:08 -07001312 if (up->flags & (SUNZILOG_FLAG_CONS_KEYB |
1313 SUNZILOG_FLAG_CONS_MOUSE))
1314 sunzilog_register_serio(up);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001315#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001316}
1317
David S. Miller4fa97dc2006-06-29 15:13:40 -07001318static int zilog_irq = -1;
1319
David S. Miller67e23a12006-07-17 21:07:17 -07001320static int __devinit zs_probe(struct of_device *op, const struct of_device_id *match)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001321{
David S. Miller8a84eb12006-07-19 22:55:08 -07001322 static int inst;
David S. Miller36764632006-06-29 15:13:17 -07001323 struct uart_sunzilog_port *up;
1324 struct zilog_layout __iomem *rp;
David S. Miller8a84eb12006-07-19 22:55:08 -07001325 int keyboard_mouse;
David S. Miller36764632006-06-29 15:13:17 -07001326 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001327
David S. Miller8a84eb12006-07-19 22:55:08 -07001328 keyboard_mouse = 0;
1329 if (of_find_property(op->node, "keyboard", NULL))
1330 keyboard_mouse = 1;
1331
David S. Miller36764632006-06-29 15:13:17 -07001332 sunzilog_chip_regs[inst] = of_ioremap(&op->resource[0], 0,
1333 sizeof(struct zilog_layout),
1334 "zs");
1335 if (!sunzilog_chip_regs[inst])
1336 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001337
David S. Miller36764632006-06-29 15:13:17 -07001338 rp = sunzilog_chip_regs[inst];
Linus Torvalds1da177e2005-04-16 15:20:36 -07001339
David S. Millerb77d35b2006-07-19 21:04:04 -07001340 if (zilog_irq == -1)
David S. Miller36764632006-06-29 15:13:17 -07001341 zilog_irq = op->irqs[0];
Linus Torvalds1da177e2005-04-16 15:20:36 -07001342
David S. Miller36764632006-06-29 15:13:17 -07001343 up = &sunzilog_port_table[inst * 2];
Linus Torvalds1da177e2005-04-16 15:20:36 -07001344
David S. Miller36764632006-06-29 15:13:17 -07001345 /* Channel A */
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;
David S. Miller8a84eb12006-07-19 22:55:08 -07001358 if (keyboard_mouse)
David S. Miller36764632006-06-29 15:13:17 -07001359 up[0].flags |= SUNZILOG_FLAG_CONS_KEYB;
1360 sunzilog_init_hw(&up[0]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001361
David S. Miller36764632006-06-29 15:13:17 -07001362 /* Channel B */
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;
1374 up[1].flags |= 0;
David S. Miller8a84eb12006-07-19 22:55:08 -07001375 if (keyboard_mouse)
David S. Miller36764632006-06-29 15:13:17 -07001376 up[1].flags |= SUNZILOG_FLAG_CONS_MOUSE;
1377 sunzilog_init_hw(&up[1]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001378
David S. Miller8a84eb12006-07-19 22:55:08 -07001379 if (!keyboard_mouse) {
David S. Miller36764632006-06-29 15:13:17 -07001380 err = uart_add_one_port(&sunzilog_reg, &up[0].port);
1381 if (err) {
1382 of_iounmap(rp, sizeof(struct zilog_layout));
1383 return err;
1384 }
1385 err = uart_add_one_port(&sunzilog_reg, &up[1].port);
1386 if (err) {
1387 uart_remove_one_port(&sunzilog_reg, &up[0].port);
1388 of_iounmap(rp, sizeof(struct zilog_layout));
1389 return err;
1390 }
David S. Miller8a84eb12006-07-19 22:55:08 -07001391 } else {
1392 printk(KERN_INFO "%s: Keyboard at MMIO %lx (irq = %d) "
1393 "is a zs\n",
1394 op->dev.bus_id, up[0].port.mapbase, op->irqs[0]);
1395 printk(KERN_INFO "%s: Mouse at MMIO %lx (irq = %d) "
1396 "is a zs\n",
1397 op->dev.bus_id, up[1].port.mapbase, op->irqs[0]);
David S. Miller36764632006-06-29 15:13:17 -07001398 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001399
David S. Miller67e23a12006-07-17 21:07:17 -07001400 dev_set_drvdata(&op->dev, &up[0]);
David S. Miller4fa97dc2006-06-29 15:13:40 -07001401
David S. Miller8a84eb12006-07-19 22:55:08 -07001402 inst++;
1403
Linus Torvalds1da177e2005-04-16 15:20:36 -07001404 return 0;
1405}
1406
David S. Miller4fa97dc2006-06-29 15:13:40 -07001407static void __devexit zs_remove_one(struct uart_sunzilog_port *up)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001408{
David S. Miller36764632006-06-29 15:13:17 -07001409 if (ZS_IS_KEYB(up) || ZS_IS_MOUSE(up)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001410#ifdef CONFIG_SERIO
David S. Miller36764632006-06-29 15:13:17 -07001411 serio_unregister_port(&up->serio);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001412#endif
David S. Miller36764632006-06-29 15:13:17 -07001413 } else
1414 uart_remove_one_port(&sunzilog_reg, &up->port);
David S. Miller4fa97dc2006-06-29 15:13:40 -07001415}
David S. Miller36764632006-06-29 15:13:17 -07001416
David S. Miller4fa97dc2006-06-29 15:13:40 -07001417static int __devexit zs_remove(struct of_device *dev)
1418{
1419 struct uart_sunzilog_port *up = dev_get_drvdata(&dev->dev);
1420 struct zilog_layout __iomem *regs;
David S. Miller36764632006-06-29 15:13:17 -07001421
David S. Miller4fa97dc2006-06-29 15:13:40 -07001422 zs_remove_one(&up[0]);
1423 zs_remove_one(&up[1]);
1424
1425 regs = sunzilog_chip_regs[up[0].port.line / 2];
1426 of_iounmap(regs, sizeof(struct zilog_layout));
1427
1428 dev_set_drvdata(&dev->dev, NULL);
David S. Miller36764632006-06-29 15:13:17 -07001429
1430 return 0;
1431}
1432
1433static struct of_device_id zs_match[] = {
1434 {
1435 .name = "zs",
1436 },
1437 {},
1438};
1439MODULE_DEVICE_TABLE(of, zs_match);
1440
1441static struct of_platform_driver zs_driver = {
1442 .name = "zs",
1443 .match_table = zs_match,
1444 .probe = zs_probe,
1445 .remove = __devexit_p(zs_remove),
1446};
1447
1448static int __init sunzilog_init(void)
1449{
1450 struct device_node *dp;
David S. Miller67e23a12006-07-17 21:07:17 -07001451 int err, uart_count;
David S. Miller8a84eb12006-07-19 22:55:08 -07001452 int num_keybms;
David S. Miller36764632006-06-29 15:13:17 -07001453
1454 NUM_SUNZILOG = 0;
David S. Miller8a84eb12006-07-19 22:55:08 -07001455 num_keybms = 0;
1456 for_each_node_by_name(dp, "zs") {
David S. Miller36764632006-06-29 15:13:17 -07001457 NUM_SUNZILOG++;
David S. Miller8a84eb12006-07-19 22:55:08 -07001458 if (of_find_property(dp, "keyboard", NULL))
1459 num_keybms++;
1460 }
David S. Miller36764632006-06-29 15:13:17 -07001461
David S. Miller67e23a12006-07-17 21:07:17 -07001462 uart_count = 0;
David S. Miller36764632006-06-29 15:13:17 -07001463 if (NUM_SUNZILOG) {
1464 int uart_count;
1465
1466 err = sunzilog_alloc_tables();
1467 if (err)
David S. Miller67e23a12006-07-17 21:07:17 -07001468 goto out;
David S. Miller36764632006-06-29 15:13:17 -07001469
David S. Miller8a84eb12006-07-19 22:55:08 -07001470 uart_count = (NUM_SUNZILOG * 2) - (2 * num_keybms);
David S. Miller36764632006-06-29 15:13:17 -07001471
1472 sunzilog_reg.nr = uart_count;
1473 sunzilog_reg.minor = sunserial_current_minor;
1474 err = uart_register_driver(&sunzilog_reg);
David S. Miller67e23a12006-07-17 21:07:17 -07001475 if (err)
1476 goto out_free_tables;
1477
David S. Miller36764632006-06-29 15:13:17 -07001478 sunzilog_reg.tty_driver->name_base = sunzilog_reg.minor - 64;
1479 sunzilog_reg.cons = SUNZILOG_CONSOLE();
1480
1481 sunserial_current_minor += uart_count;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001482 }
1483
David S. Miller67e23a12006-07-17 21:07:17 -07001484 err = of_register_driver(&zs_driver, &of_bus_type);
1485 if (err)
1486 goto out_unregister_uart;
1487
1488 if (zilog_irq != -1) {
1489 err = request_irq(zilog_irq, sunzilog_interrupt, IRQF_SHARED,
1490 "zs", sunzilog_irq_chain);
1491 if (err)
1492 goto out_unregister_driver;
1493 }
1494
1495out:
1496 return err;
1497
1498out_unregister_driver:
1499 of_unregister_driver(&zs_driver);
1500
1501out_unregister_uart:
1502 if (NUM_SUNZILOG) {
1503 uart_unregister_driver(&sunzilog_reg);
1504 sunzilog_reg.cons = NULL;
1505 }
1506
1507out_free_tables:
1508 sunzilog_free_tables();
1509 goto out;
David S. Miller36764632006-06-29 15:13:17 -07001510}
1511
1512static void __exit sunzilog_exit(void)
1513{
1514 of_unregister_driver(&zs_driver);
1515
David S. Miller4fa97dc2006-06-29 15:13:40 -07001516 if (zilog_irq != -1) {
1517 free_irq(zilog_irq, sunzilog_irq_chain);
1518 zilog_irq = -1;
1519 }
1520
David S. Miller36764632006-06-29 15:13:17 -07001521 if (NUM_SUNZILOG) {
1522 uart_unregister_driver(&sunzilog_reg);
1523 sunzilog_free_tables();
1524 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001525}
1526
1527module_init(sunzilog_init);
1528module_exit(sunzilog_exit);
1529
1530MODULE_AUTHOR("David S. Miller");
1531MODULE_DESCRIPTION("Sun Zilog serial port driver");
David S. Miller9efc3712006-06-29 15:14:17 -07001532MODULE_VERSION("2.0");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001533MODULE_LICENSE("GPL");