blob: 283bef0d24cb47a0fa0e956af5ef5a95c800a9ce [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. Millerf3c681c2007-07-15 23:53:32 -070012 * Copyright (C) 2002, 2006, 2007 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>
Linus Torvalds1da177e2005-04-16 15:20:36 -070017#include <linux/errno.h>
18#include <linux/delay.h>
19#include <linux/tty.h>
20#include <linux/tty_flip.h>
21#include <linux/major.h>
22#include <linux/string.h>
23#include <linux/ptrace.h>
24#include <linux/ioport.h>
25#include <linux/slab.h>
26#include <linux/circ_buf.h>
27#include <linux/serial.h>
28#include <linux/sysrq.h>
29#include <linux/console.h>
30#include <linux/spinlock.h>
31#ifdef CONFIG_SERIO
32#include <linux/serio.h>
33#endif
34#include <linux/init.h>
35
36#include <asm/io.h>
37#include <asm/irq.h>
David S. Miller36764632006-06-29 15:13:17 -070038#include <asm/prom.h>
39#include <asm/of_device.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070040
41#if defined(CONFIG_SERIAL_SUNZILOG_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
42#define SUPPORT_SYSRQ
43#endif
44
45#include <linux/serial_core.h>
46
47#include "suncore.h"
48#include "sunzilog.h"
49
50/* On 32-bit sparcs we need to delay after register accesses
51 * to accommodate sun4 systems, but we do not need to flush writes.
52 * On 64-bit sparc we only need to flush single writes to ensure
53 * completion.
54 */
55#ifndef CONFIG_SPARC64
56#define ZSDELAY() udelay(5)
57#define ZSDELAY_LONG() udelay(20)
58#define ZS_WSYNC(channel) do { } while (0)
59#else
60#define ZSDELAY()
61#define ZSDELAY_LONG()
62#define ZS_WSYNC(__channel) \
David S. Miller36764632006-06-29 15:13:17 -070063 readb(&((__channel)->control))
Linus Torvalds1da177e2005-04-16 15:20:36 -070064#endif
65
66static int num_sunzilog;
67#define NUM_SUNZILOG num_sunzilog
68#define NUM_CHANNELS (NUM_SUNZILOG * 2)
69
Linus Torvalds1da177e2005-04-16 15:20:36 -070070#define ZS_CLOCK 4915200 /* Zilog input clock rate. */
71#define ZS_CLOCK_DIVISOR 16 /* Divisor this driver uses. */
72
73/*
74 * We wrap our port structure around the generic uart_port.
75 */
76struct uart_sunzilog_port {
77 struct uart_port port;
78
79 /* IRQ servicing chain. */
80 struct uart_sunzilog_port *next;
81
82 /* Current values of Zilog write registers. */
83 unsigned char curregs[NUM_ZSREGS];
84
85 unsigned int flags;
86#define SUNZILOG_FLAG_CONS_KEYB 0x00000001
87#define SUNZILOG_FLAG_CONS_MOUSE 0x00000002
88#define SUNZILOG_FLAG_IS_CONS 0x00000004
89#define SUNZILOG_FLAG_IS_KGDB 0x00000008
90#define SUNZILOG_FLAG_MODEM_STATUS 0x00000010
91#define SUNZILOG_FLAG_IS_CHANNEL_A 0x00000020
92#define SUNZILOG_FLAG_REGS_HELD 0x00000040
93#define SUNZILOG_FLAG_TX_STOPPED 0x00000080
94#define SUNZILOG_FLAG_TX_ACTIVE 0x00000100
Mark Fortescue7cc5c852007-05-09 13:49:04 -070095#define SUNZILOG_FLAG_ESCC 0x00000200
96#define SUNZILOG_FLAG_ISR_HANDLER 0x00000400
Linus Torvalds1da177e2005-04-16 15:20:36 -070097
98 unsigned int cflag;
99
100 unsigned char parity_mask;
101 unsigned char prev_status;
102
103#ifdef CONFIG_SERIO
David S. Miller36764632006-06-29 15:13:17 -0700104 struct serio serio;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105 int serio_open;
106#endif
107};
108
109#define ZILOG_CHANNEL_FROM_PORT(PORT) ((struct zilog_channel __iomem *)((PORT)->membase))
110#define UART_ZILOG(PORT) ((struct uart_sunzilog_port *)(PORT))
111
112#define ZS_IS_KEYB(UP) ((UP)->flags & SUNZILOG_FLAG_CONS_KEYB)
113#define ZS_IS_MOUSE(UP) ((UP)->flags & SUNZILOG_FLAG_CONS_MOUSE)
114#define ZS_IS_CONS(UP) ((UP)->flags & SUNZILOG_FLAG_IS_CONS)
115#define ZS_IS_KGDB(UP) ((UP)->flags & SUNZILOG_FLAG_IS_KGDB)
116#define ZS_WANTS_MODEM_STATUS(UP) ((UP)->flags & SUNZILOG_FLAG_MODEM_STATUS)
117#define ZS_IS_CHANNEL_A(UP) ((UP)->flags & SUNZILOG_FLAG_IS_CHANNEL_A)
118#define ZS_REGS_HELD(UP) ((UP)->flags & SUNZILOG_FLAG_REGS_HELD)
119#define ZS_TX_STOPPED(UP) ((UP)->flags & SUNZILOG_FLAG_TX_STOPPED)
120#define ZS_TX_ACTIVE(UP) ((UP)->flags & SUNZILOG_FLAG_TX_ACTIVE)
121
122/* Reading and writing Zilog8530 registers. The delays are to make this
123 * driver work on the Sun4 which needs a settling delay after each chip
124 * register access, other machines handle this in hardware via auxiliary
125 * flip-flops which implement the settle time we do in software.
126 *
127 * The port lock must be held and local IRQs must be disabled
128 * when {read,write}_zsreg is invoked.
129 */
130static unsigned char read_zsreg(struct zilog_channel __iomem *channel,
131 unsigned char reg)
132{
133 unsigned char retval;
134
David S. Miller36764632006-06-29 15:13:17 -0700135 writeb(reg, &channel->control);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136 ZSDELAY();
David S. Miller36764632006-06-29 15:13:17 -0700137 retval = readb(&channel->control);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138 ZSDELAY();
139
140 return retval;
141}
142
143static void write_zsreg(struct zilog_channel __iomem *channel,
144 unsigned char reg, unsigned char value)
145{
David S. Miller36764632006-06-29 15:13:17 -0700146 writeb(reg, &channel->control);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147 ZSDELAY();
David S. Miller36764632006-06-29 15:13:17 -0700148 writeb(value, &channel->control);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149 ZSDELAY();
150}
151
152static void sunzilog_clear_fifo(struct zilog_channel __iomem *channel)
153{
154 int i;
155
156 for (i = 0; i < 32; i++) {
157 unsigned char regval;
158
David S. Miller36764632006-06-29 15:13:17 -0700159 regval = readb(&channel->control);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160 ZSDELAY();
161 if (regval & Rx_CH_AV)
162 break;
163
164 regval = read_zsreg(channel, R1);
David S. Miller36764632006-06-29 15:13:17 -0700165 readb(&channel->data);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166 ZSDELAY();
167
168 if (regval & (PAR_ERR | Rx_OVR | CRC_ERR)) {
David S. Miller36764632006-06-29 15:13:17 -0700169 writeb(ERR_RES, &channel->control);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170 ZSDELAY();
171 ZS_WSYNC(channel);
172 }
173 }
174}
175
176/* This function must only be called when the TX is not busy. The UART
177 * port lock must be held and local interrupts disabled.
178 */
Mark Fortescue7cc5c852007-05-09 13:49:04 -0700179static int __load_zsregs(struct zilog_channel __iomem *channel, unsigned char *regs)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180{
181 int i;
Mark Fortescue7cc5c852007-05-09 13:49:04 -0700182 int escc;
183 unsigned char r15;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184
185 /* Let pending transmits finish. */
186 for (i = 0; i < 1000; i++) {
187 unsigned char stat = read_zsreg(channel, R1);
188 if (stat & ALL_SNT)
189 break;
190 udelay(100);
191 }
192
David S. Miller36764632006-06-29 15:13:17 -0700193 writeb(ERR_RES, &channel->control);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194 ZSDELAY();
195 ZS_WSYNC(channel);
196
197 sunzilog_clear_fifo(channel);
198
199 /* Disable all interrupts. */
200 write_zsreg(channel, R1,
201 regs[R1] & ~(RxINT_MASK | TxINT_ENAB | EXT_INT_ENAB));
202
203 /* Set parity, sync config, stop bits, and clock divisor. */
204 write_zsreg(channel, R4, regs[R4]);
205
206 /* Set misc. TX/RX control bits. */
207 write_zsreg(channel, R10, regs[R10]);
208
209 /* Set TX/RX controls sans the enable bits. */
210 write_zsreg(channel, R3, regs[R3] & ~RxENAB);
211 write_zsreg(channel, R5, regs[R5] & ~TxENAB);
212
213 /* Synchronous mode config. */
214 write_zsreg(channel, R6, regs[R6]);
215 write_zsreg(channel, R7, regs[R7]);
216
217 /* Don't mess with the interrupt vector (R2, unused by us) and
218 * master interrupt control (R9). We make sure this is setup
219 * properly at probe time then never touch it again.
220 */
221
222 /* Disable baud generator. */
223 write_zsreg(channel, R14, regs[R14] & ~BRENAB);
224
225 /* Clock mode control. */
226 write_zsreg(channel, R11, regs[R11]);
227
228 /* Lower and upper byte of baud rate generator divisor. */
229 write_zsreg(channel, R12, regs[R12]);
230 write_zsreg(channel, R13, regs[R13]);
231
232 /* Now rewrite R14, with BRENAB (if set). */
233 write_zsreg(channel, R14, regs[R14]);
234
235 /* External status interrupt control. */
Mark Fortescue7cc5c852007-05-09 13:49:04 -0700236 write_zsreg(channel, R15, (regs[R15] | WR7pEN) & ~FIFOEN);
237
238 /* ESCC Extension Register */
239 r15 = read_zsreg(channel, R15);
240 if (r15 & 0x01) {
241 write_zsreg(channel, R7, regs[R7p]);
242
243 /* External status interrupt and FIFO control. */
244 write_zsreg(channel, R15, regs[R15] & ~WR7pEN);
245 escc = 1;
246 } else {
247 /* Clear FIFO bit case it is an issue */
248 regs[R15] &= ~FIFOEN;
249 escc = 0;
250 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251
252 /* Reset external status interrupts. */
Mark Fortescue7cc5c852007-05-09 13:49:04 -0700253 write_zsreg(channel, R0, RES_EXT_INT); /* First Latch */
254 write_zsreg(channel, R0, RES_EXT_INT); /* Second Latch */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700255
256 /* Rewrite R3/R5, this time without enables masked. */
257 write_zsreg(channel, R3, regs[R3]);
258 write_zsreg(channel, R5, regs[R5]);
259
260 /* Rewrite R1, this time without IRQ enabled masked. */
261 write_zsreg(channel, R1, regs[R1]);
Mark Fortescue7cc5c852007-05-09 13:49:04 -0700262
263 return escc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264}
265
266/* Reprogram the Zilog channel HW registers with the copies found in the
267 * software state struct. If the transmitter is busy, we defer this update
268 * until the next TX complete interrupt. Else, we do it right now.
269 *
270 * The UART port lock must be held and local interrupts disabled.
271 */
272static void sunzilog_maybe_update_regs(struct uart_sunzilog_port *up,
273 struct zilog_channel __iomem *channel)
274{
275 if (!ZS_REGS_HELD(up)) {
276 if (ZS_TX_ACTIVE(up)) {
277 up->flags |= SUNZILOG_FLAG_REGS_HELD;
278 } else {
279 __load_zsregs(channel, up->curregs);
280 }
281 }
282}
283
284static void sunzilog_change_mouse_baud(struct uart_sunzilog_port *up)
285{
286 unsigned int cur_cflag = up->cflag;
287 int brg, new_baud;
288
289 up->cflag &= ~CBAUD;
290 up->cflag |= suncore_mouse_baud_cflag_next(cur_cflag, &new_baud);
291
292 brg = BPS_TO_BRG(new_baud, ZS_CLOCK / ZS_CLOCK_DIVISOR);
293 up->curregs[R12] = (brg & 0xff);
294 up->curregs[R13] = (brg >> 8) & 0xff;
295 sunzilog_maybe_update_regs(up, ZILOG_CHANNEL_FROM_PORT(&up->port));
296}
297
298static void sunzilog_kbdms_receive_chars(struct uart_sunzilog_port *up,
David Howells7d12e782006-10-05 14:55:46 +0100299 unsigned char ch, int is_break)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300{
301 if (ZS_IS_KEYB(up)) {
302 /* Stop-A is handled by drivers/char/keyboard.c now. */
303#ifdef CONFIG_SERIO
304 if (up->serio_open)
David Howells7d12e782006-10-05 14:55:46 +0100305 serio_interrupt(&up->serio, ch, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306#endif
307 } else if (ZS_IS_MOUSE(up)) {
308 int ret = suncore_mouse_baud_detection(ch, is_break);
309
310 switch (ret) {
311 case 2:
312 sunzilog_change_mouse_baud(up);
313 /* fallthru */
314 case 1:
315 break;
316
317 case 0:
318#ifdef CONFIG_SERIO
319 if (up->serio_open)
David Howells7d12e782006-10-05 14:55:46 +0100320 serio_interrupt(&up->serio, ch, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700321#endif
322 break;
323 };
324 }
325}
326
327static struct tty_struct *
328sunzilog_receive_chars(struct uart_sunzilog_port *up,
David Howells7d12e782006-10-05 14:55:46 +0100329 struct zilog_channel __iomem *channel)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700330{
331 struct tty_struct *tty;
Alan Cox33f0f882006-01-09 20:54:13 -0800332 unsigned char ch, r1, flag;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700333
334 tty = NULL;
335 if (up->port.info != NULL && /* Unopened serial console */
336 up->port.info->tty != NULL) /* Keyboard || mouse */
337 tty = up->port.info->tty;
338
339 for (;;) {
340
341 r1 = read_zsreg(channel, R1);
342 if (r1 & (PAR_ERR | Rx_OVR | CRC_ERR)) {
David S. Miller36764632006-06-29 15:13:17 -0700343 writeb(ERR_RES, &channel->control);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344 ZSDELAY();
345 ZS_WSYNC(channel);
346 }
347
David S. Miller36764632006-06-29 15:13:17 -0700348 ch = readb(&channel->control);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349 ZSDELAY();
350
351 /* This funny hack depends upon BRK_ABRT not interfering
352 * with the other bits we care about in R1.
353 */
354 if (ch & BRK_ABRT)
355 r1 |= BRK_ABRT;
356
357 if (!(ch & Rx_CH_AV))
358 break;
359
David S. Miller36764632006-06-29 15:13:17 -0700360 ch = readb(&channel->data);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361 ZSDELAY();
362
363 ch &= up->parity_mask;
364
365 if (unlikely(ZS_IS_KEYB(up)) || unlikely(ZS_IS_MOUSE(up))) {
David Howells7d12e782006-10-05 14:55:46 +0100366 sunzilog_kbdms_receive_chars(up, ch, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700367 continue;
368 }
369
370 if (tty == NULL) {
David Howells7d12e782006-10-05 14:55:46 +0100371 uart_handle_sysrq_char(&up->port, ch);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700372 continue;
373 }
374
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375 /* A real serial line, record the character and status. */
Alan Cox33f0f882006-01-09 20:54:13 -0800376 flag = TTY_NORMAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700377 up->port.icount.rx++;
378 if (r1 & (BRK_ABRT | PAR_ERR | Rx_OVR | CRC_ERR)) {
379 if (r1 & BRK_ABRT) {
380 r1 &= ~(PAR_ERR | CRC_ERR);
381 up->port.icount.brk++;
382 if (uart_handle_break(&up->port))
383 continue;
384 }
385 else if (r1 & PAR_ERR)
386 up->port.icount.parity++;
387 else if (r1 & CRC_ERR)
388 up->port.icount.frame++;
389 if (r1 & Rx_OVR)
390 up->port.icount.overrun++;
391 r1 &= up->port.read_status_mask;
392 if (r1 & BRK_ABRT)
Alan Cox33f0f882006-01-09 20:54:13 -0800393 flag = TTY_BREAK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394 else if (r1 & PAR_ERR)
Alan Cox33f0f882006-01-09 20:54:13 -0800395 flag = TTY_PARITY;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700396 else if (r1 & CRC_ERR)
Alan Cox33f0f882006-01-09 20:54:13 -0800397 flag = TTY_FRAME;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700398 }
David Howells7d12e782006-10-05 14:55:46 +0100399 if (uart_handle_sysrq_char(&up->port, ch))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700400 continue;
401
402 if (up->port.ignore_status_mask == 0xff ||
403 (r1 & up->port.ignore_status_mask) == 0) {
Alan Cox33f0f882006-01-09 20:54:13 -0800404 tty_insert_flip_char(tty, ch, flag);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700405 }
Alan Cox33f0f882006-01-09 20:54:13 -0800406 if (r1 & Rx_OVR)
407 tty_insert_flip_char(tty, 0, TTY_OVERRUN);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700408 }
409
410 return tty;
411}
412
413static void sunzilog_status_handle(struct uart_sunzilog_port *up,
David Howells7d12e782006-10-05 14:55:46 +0100414 struct zilog_channel __iomem *channel)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700415{
416 unsigned char status;
417
David S. Miller36764632006-06-29 15:13:17 -0700418 status = readb(&channel->control);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700419 ZSDELAY();
420
David S. Miller36764632006-06-29 15:13:17 -0700421 writeb(RES_EXT_INT, &channel->control);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700422 ZSDELAY();
423 ZS_WSYNC(channel);
424
425 if (status & BRK_ABRT) {
426 if (ZS_IS_MOUSE(up))
David Howells7d12e782006-10-05 14:55:46 +0100427 sunzilog_kbdms_receive_chars(up, 0, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700428 if (ZS_IS_CONS(up)) {
429 /* Wait for BREAK to deassert to avoid potentially
430 * confusing the PROM.
431 */
432 while (1) {
David S. Miller36764632006-06-29 15:13:17 -0700433 status = readb(&channel->control);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700434 ZSDELAY();
435 if (!(status & BRK_ABRT))
436 break;
437 }
438 sun_do_break();
439 return;
440 }
441 }
442
443 if (ZS_WANTS_MODEM_STATUS(up)) {
444 if (status & SYNC)
445 up->port.icount.dsr++;
446
447 /* The Zilog just gives us an interrupt when DCD/CTS/etc. change.
448 * But it does not tell us which bit has changed, we have to keep
449 * track of this ourselves.
450 */
451 if ((status ^ up->prev_status) ^ DCD)
452 uart_handle_dcd_change(&up->port,
453 (status & DCD));
454 if ((status ^ up->prev_status) ^ CTS)
455 uart_handle_cts_change(&up->port,
456 (status & CTS));
457
458 wake_up_interruptible(&up->port.info->delta_msr_wait);
459 }
460
461 up->prev_status = status;
462}
463
464static void sunzilog_transmit_chars(struct uart_sunzilog_port *up,
465 struct zilog_channel __iomem *channel)
466{
467 struct circ_buf *xmit;
468
469 if (ZS_IS_CONS(up)) {
David S. Miller36764632006-06-29 15:13:17 -0700470 unsigned char status = readb(&channel->control);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700471 ZSDELAY();
472
473 /* TX still busy? Just wait for the next TX done interrupt.
474 *
475 * It can occur because of how we do serial console writes. It would
476 * be nice to transmit console writes just like we normally would for
477 * a TTY line. (ie. buffered and TX interrupt driven). That is not
478 * easy because console writes cannot sleep. One solution might be
479 * to poll on enough port->xmit space becomming free. -DaveM
480 */
481 if (!(status & Tx_BUF_EMP))
482 return;
483 }
484
485 up->flags &= ~SUNZILOG_FLAG_TX_ACTIVE;
486
487 if (ZS_REGS_HELD(up)) {
488 __load_zsregs(channel, up->curregs);
489 up->flags &= ~SUNZILOG_FLAG_REGS_HELD;
490 }
491
492 if (ZS_TX_STOPPED(up)) {
493 up->flags &= ~SUNZILOG_FLAG_TX_STOPPED;
494 goto ack_tx_int;
495 }
496
497 if (up->port.x_char) {
498 up->flags |= SUNZILOG_FLAG_TX_ACTIVE;
David S. Miller36764632006-06-29 15:13:17 -0700499 writeb(up->port.x_char, &channel->data);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700500 ZSDELAY();
501 ZS_WSYNC(channel);
502
503 up->port.icount.tx++;
504 up->port.x_char = 0;
505 return;
506 }
507
508 if (up->port.info == NULL)
509 goto ack_tx_int;
510 xmit = &up->port.info->xmit;
David S. Millerb8df1102005-10-10 20:43:22 -0700511 if (uart_circ_empty(xmit))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700512 goto ack_tx_int;
David S. Millerb8df1102005-10-10 20:43:22 -0700513
Linus Torvalds1da177e2005-04-16 15:20:36 -0700514 if (uart_tx_stopped(&up->port))
515 goto ack_tx_int;
516
517 up->flags |= SUNZILOG_FLAG_TX_ACTIVE;
David S. Miller36764632006-06-29 15:13:17 -0700518 writeb(xmit->buf[xmit->tail], &channel->data);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700519 ZSDELAY();
520 ZS_WSYNC(channel);
521
522 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
523 up->port.icount.tx++;
524
525 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
526 uart_write_wakeup(&up->port);
527
528 return;
529
530ack_tx_int:
David S. Miller36764632006-06-29 15:13:17 -0700531 writeb(RES_Tx_P, &channel->control);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700532 ZSDELAY();
533 ZS_WSYNC(channel);
534}
535
David Howells7d12e782006-10-05 14:55:46 +0100536static irqreturn_t sunzilog_interrupt(int irq, void *dev_id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700537{
538 struct uart_sunzilog_port *up = dev_id;
539
540 while (up) {
541 struct zilog_channel __iomem *channel
542 = ZILOG_CHANNEL_FROM_PORT(&up->port);
543 struct tty_struct *tty;
544 unsigned char r3;
545
546 spin_lock(&up->port.lock);
547 r3 = read_zsreg(channel, R3);
548
549 /* Channel A */
550 tty = NULL;
551 if (r3 & (CHAEXT | CHATxIP | CHARxIP)) {
David S. Miller36764632006-06-29 15:13:17 -0700552 writeb(RES_H_IUS, &channel->control);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700553 ZSDELAY();
554 ZS_WSYNC(channel);
555
556 if (r3 & CHARxIP)
David Howells7d12e782006-10-05 14:55:46 +0100557 tty = sunzilog_receive_chars(up, channel);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700558 if (r3 & CHAEXT)
David Howells7d12e782006-10-05 14:55:46 +0100559 sunzilog_status_handle(up, channel);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700560 if (r3 & CHATxIP)
561 sunzilog_transmit_chars(up, channel);
562 }
563 spin_unlock(&up->port.lock);
564
565 if (tty)
566 tty_flip_buffer_push(tty);
567
568 /* Channel B */
569 up = up->next;
570 channel = ZILOG_CHANNEL_FROM_PORT(&up->port);
571
572 spin_lock(&up->port.lock);
573 tty = NULL;
574 if (r3 & (CHBEXT | CHBTxIP | CHBRxIP)) {
David S. Miller36764632006-06-29 15:13:17 -0700575 writeb(RES_H_IUS, &channel->control);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700576 ZSDELAY();
577 ZS_WSYNC(channel);
578
579 if (r3 & CHBRxIP)
David Howells7d12e782006-10-05 14:55:46 +0100580 tty = sunzilog_receive_chars(up, channel);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700581 if (r3 & CHBEXT)
David Howells7d12e782006-10-05 14:55:46 +0100582 sunzilog_status_handle(up, channel);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700583 if (r3 & CHBTxIP)
584 sunzilog_transmit_chars(up, channel);
585 }
586 spin_unlock(&up->port.lock);
587
588 if (tty)
589 tty_flip_buffer_push(tty);
590
591 up = up->next;
592 }
593
594 return IRQ_HANDLED;
595}
596
597/* A convenient way to quickly get R0 status. The caller must _not_ hold the
598 * port lock, it is acquired here.
599 */
600static __inline__ unsigned char sunzilog_read_channel_status(struct uart_port *port)
601{
602 struct zilog_channel __iomem *channel;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700603 unsigned char status;
604
Linus Torvalds1da177e2005-04-16 15:20:36 -0700605 channel = ZILOG_CHANNEL_FROM_PORT(port);
David S. Miller36764632006-06-29 15:13:17 -0700606 status = readb(&channel->control);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700607 ZSDELAY();
608
Linus Torvalds1da177e2005-04-16 15:20:36 -0700609 return status;
610}
611
612/* The port lock is not held. */
613static unsigned int sunzilog_tx_empty(struct uart_port *port)
614{
Russell Kingc5f46442005-06-29 09:42:38 +0100615 unsigned long flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700616 unsigned char status;
617 unsigned int ret;
618
Russell Kingc5f46442005-06-29 09:42:38 +0100619 spin_lock_irqsave(&port->lock, flags);
620
Linus Torvalds1da177e2005-04-16 15:20:36 -0700621 status = sunzilog_read_channel_status(port);
Russell Kingc5f46442005-06-29 09:42:38 +0100622
623 spin_unlock_irqrestore(&port->lock, flags);
624
Linus Torvalds1da177e2005-04-16 15:20:36 -0700625 if (status & Tx_BUF_EMP)
626 ret = TIOCSER_TEMT;
627 else
628 ret = 0;
629
630 return ret;
631}
632
Russell Kingc5f46442005-06-29 09:42:38 +0100633/* The port lock is held and interrupts are disabled. */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700634static unsigned int sunzilog_get_mctrl(struct uart_port *port)
635{
636 unsigned char status;
637 unsigned int ret;
638
639 status = sunzilog_read_channel_status(port);
640
641 ret = 0;
642 if (status & DCD)
643 ret |= TIOCM_CAR;
644 if (status & SYNC)
645 ret |= TIOCM_DSR;
646 if (status & CTS)
647 ret |= TIOCM_CTS;
648
649 return ret;
650}
651
652/* The port lock is held and interrupts are disabled. */
653static void sunzilog_set_mctrl(struct uart_port *port, unsigned int mctrl)
654{
655 struct uart_sunzilog_port *up = (struct uart_sunzilog_port *) port;
656 struct zilog_channel __iomem *channel = ZILOG_CHANNEL_FROM_PORT(port);
657 unsigned char set_bits, clear_bits;
658
659 set_bits = clear_bits = 0;
660
661 if (mctrl & TIOCM_RTS)
662 set_bits |= RTS;
663 else
664 clear_bits |= RTS;
665 if (mctrl & TIOCM_DTR)
666 set_bits |= DTR;
667 else
668 clear_bits |= DTR;
669
670 /* NOTE: Not subject to 'transmitter active' rule. */
671 up->curregs[R5] |= set_bits;
672 up->curregs[R5] &= ~clear_bits;
673 write_zsreg(channel, R5, up->curregs[R5]);
674}
675
676/* The port lock is held and interrupts are disabled. */
Russell Kingb129a8c2005-08-31 10:12:14 +0100677static void sunzilog_stop_tx(struct uart_port *port)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700678{
679 struct uart_sunzilog_port *up = (struct uart_sunzilog_port *) port;
680
681 up->flags |= SUNZILOG_FLAG_TX_STOPPED;
682}
683
684/* The port lock is held and interrupts are disabled. */
Russell Kingb129a8c2005-08-31 10:12:14 +0100685static void sunzilog_start_tx(struct uart_port *port)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700686{
687 struct uart_sunzilog_port *up = (struct uart_sunzilog_port *) port;
688 struct zilog_channel __iomem *channel = ZILOG_CHANNEL_FROM_PORT(port);
689 unsigned char status;
690
691 up->flags |= SUNZILOG_FLAG_TX_ACTIVE;
692 up->flags &= ~SUNZILOG_FLAG_TX_STOPPED;
693
David S. Miller36764632006-06-29 15:13:17 -0700694 status = readb(&channel->control);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700695 ZSDELAY();
696
697 /* TX busy? Just wait for the TX done interrupt. */
698 if (!(status & Tx_BUF_EMP))
699 return;
700
701 /* Send the first character to jump-start the TX done
702 * IRQ sending engine.
703 */
704 if (port->x_char) {
David S. Miller36764632006-06-29 15:13:17 -0700705 writeb(port->x_char, &channel->data);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700706 ZSDELAY();
707 ZS_WSYNC(channel);
708
709 port->icount.tx++;
710 port->x_char = 0;
711 } else {
712 struct circ_buf *xmit = &port->info->xmit;
713
David S. Miller36764632006-06-29 15:13:17 -0700714 writeb(xmit->buf[xmit->tail], &channel->data);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700715 ZSDELAY();
716 ZS_WSYNC(channel);
717
718 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
719 port->icount.tx++;
720
721 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
722 uart_write_wakeup(&up->port);
723 }
724}
725
726/* The port lock is held. */
727static void sunzilog_stop_rx(struct uart_port *port)
728{
729 struct uart_sunzilog_port *up = UART_ZILOG(port);
730 struct zilog_channel __iomem *channel;
731
732 if (ZS_IS_CONS(up))
733 return;
734
735 channel = ZILOG_CHANNEL_FROM_PORT(port);
736
737 /* Disable all RX interrupts. */
738 up->curregs[R1] &= ~RxINT_MASK;
739 sunzilog_maybe_update_regs(up, channel);
740}
741
742/* The port lock is held. */
743static void sunzilog_enable_ms(struct uart_port *port)
744{
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 new_reg;
748
749 new_reg = up->curregs[R15] | (DCDIE | SYNCIE | CTSIE);
750 if (new_reg != up->curregs[R15]) {
751 up->curregs[R15] = new_reg;
752
753 /* NOTE: Not subject to 'transmitter active' rule. */
Mark Fortescue7cc5c852007-05-09 13:49:04 -0700754 write_zsreg(channel, R15, up->curregs[R15] & ~WR7pEN);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700755 }
756}
757
758/* The port lock is not held. */
759static void sunzilog_break_ctl(struct uart_port *port, int break_state)
760{
761 struct uart_sunzilog_port *up = (struct uart_sunzilog_port *) port;
762 struct zilog_channel __iomem *channel = ZILOG_CHANNEL_FROM_PORT(port);
763 unsigned char set_bits, clear_bits, new_reg;
764 unsigned long flags;
765
766 set_bits = clear_bits = 0;
767
768 if (break_state)
769 set_bits |= SND_BRK;
770 else
771 clear_bits |= SND_BRK;
772
773 spin_lock_irqsave(&port->lock, flags);
774
775 new_reg = (up->curregs[R5] | set_bits) & ~clear_bits;
776 if (new_reg != up->curregs[R5]) {
777 up->curregs[R5] = new_reg;
778
779 /* NOTE: Not subject to 'transmitter active' rule. */
780 write_zsreg(channel, R5, up->curregs[R5]);
781 }
782
783 spin_unlock_irqrestore(&port->lock, flags);
784}
785
786static void __sunzilog_startup(struct uart_sunzilog_port *up)
787{
788 struct zilog_channel __iomem *channel;
789
790 channel = ZILOG_CHANNEL_FROM_PORT(&up->port);
David S. Miller36764632006-06-29 15:13:17 -0700791 up->prev_status = readb(&channel->control);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700792
793 /* Enable receiver and transmitter. */
794 up->curregs[R3] |= RxENAB;
795 up->curregs[R5] |= TxENAB;
796
797 up->curregs[R1] |= EXT_INT_ENAB | INT_ALL_Rx | TxINT_ENAB;
798 sunzilog_maybe_update_regs(up, channel);
799}
800
801static int sunzilog_startup(struct uart_port *port)
802{
803 struct uart_sunzilog_port *up = UART_ZILOG(port);
804 unsigned long flags;
805
806 if (ZS_IS_CONS(up))
807 return 0;
808
809 spin_lock_irqsave(&port->lock, flags);
810 __sunzilog_startup(up);
811 spin_unlock_irqrestore(&port->lock, flags);
812 return 0;
813}
814
815/*
816 * The test for ZS_IS_CONS is explained by the following e-mail:
817 *****
818 * From: Russell King <rmk@arm.linux.org.uk>
819 * Date: Sun, 8 Dec 2002 10:18:38 +0000
820 *
821 * On Sun, Dec 08, 2002 at 02:43:36AM -0500, Pete Zaitcev wrote:
822 * > I boot my 2.5 boxes using "console=ttyS0,9600" argument,
823 * > and I noticed that something is not right with reference
824 * > counting in this case. It seems that when the console
825 * > is open by kernel initially, this is not accounted
826 * > as an open, and uart_startup is not called.
827 *
828 * That is correct. We are unable to call uart_startup when the serial
829 * console is initialised because it may need to allocate memory (as
830 * request_irq does) and the memory allocators may not have been
831 * initialised.
832 *
833 * 1. initialise the port into a state where it can send characters in the
834 * console write method.
835 *
836 * 2. don't do the actual hardware shutdown in your shutdown() method (but
837 * do the normal software shutdown - ie, free irqs etc)
838 *****
839 */
840static void sunzilog_shutdown(struct uart_port *port)
841{
842 struct uart_sunzilog_port *up = UART_ZILOG(port);
843 struct zilog_channel __iomem *channel;
844 unsigned long flags;
845
846 if (ZS_IS_CONS(up))
847 return;
848
849 spin_lock_irqsave(&port->lock, flags);
850
851 channel = ZILOG_CHANNEL_FROM_PORT(port);
852
853 /* Disable receiver and transmitter. */
854 up->curregs[R3] &= ~RxENAB;
855 up->curregs[R5] &= ~TxENAB;
856
857 /* Disable all interrupts and BRK assertion. */
858 up->curregs[R1] &= ~(EXT_INT_ENAB | TxINT_ENAB | RxINT_MASK);
859 up->curregs[R5] &= ~SND_BRK;
860 sunzilog_maybe_update_regs(up, channel);
861
862 spin_unlock_irqrestore(&port->lock, flags);
863}
864
865/* Shared by TTY driver and serial console setup. The port lock is held
866 * and local interrupts are disabled.
867 */
868static void
869sunzilog_convert_to_zs(struct uart_sunzilog_port *up, unsigned int cflag,
870 unsigned int iflag, int brg)
871{
872
873 up->curregs[R10] = NRZ;
874 up->curregs[R11] = TCBR | RCBR;
875
876 /* Program BAUD and clock source. */
877 up->curregs[R4] &= ~XCLK_MASK;
878 up->curregs[R4] |= X16CLK;
879 up->curregs[R12] = brg & 0xff;
880 up->curregs[R13] = (brg >> 8) & 0xff;
881 up->curregs[R14] = BRSRC | BRENAB;
882
883 /* Character size, stop bits, and parity. */
Mark Fortescue7cc5c852007-05-09 13:49:04 -0700884 up->curregs[R3] &= ~RxN_MASK;
885 up->curregs[R5] &= ~TxN_MASK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700886 switch (cflag & CSIZE) {
887 case CS5:
Mark Fortescue7cc5c852007-05-09 13:49:04 -0700888 up->curregs[R3] |= Rx5;
889 up->curregs[R5] |= Tx5;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700890 up->parity_mask = 0x1f;
891 break;
892 case CS6:
Mark Fortescue7cc5c852007-05-09 13:49:04 -0700893 up->curregs[R3] |= Rx6;
894 up->curregs[R5] |= Tx6;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700895 up->parity_mask = 0x3f;
896 break;
897 case CS7:
Mark Fortescue7cc5c852007-05-09 13:49:04 -0700898 up->curregs[R3] |= Rx7;
899 up->curregs[R5] |= Tx7;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700900 up->parity_mask = 0x7f;
901 break;
902 case CS8:
903 default:
Mark Fortescue7cc5c852007-05-09 13:49:04 -0700904 up->curregs[R3] |= Rx8;
905 up->curregs[R5] |= Tx8;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700906 up->parity_mask = 0xff;
907 break;
908 };
Mark Fortescue7cc5c852007-05-09 13:49:04 -0700909 up->curregs[R4] &= ~0x0c;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700910 if (cflag & CSTOPB)
Mark Fortescue7cc5c852007-05-09 13:49:04 -0700911 up->curregs[R4] |= SB2;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700912 else
Mark Fortescue7cc5c852007-05-09 13:49:04 -0700913 up->curregs[R4] |= SB1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700914 if (cflag & PARENB)
Mark Fortescue7cc5c852007-05-09 13:49:04 -0700915 up->curregs[R4] |= PAR_ENAB;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700916 else
Mark Fortescue7cc5c852007-05-09 13:49:04 -0700917 up->curregs[R4] &= ~PAR_ENAB;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700918 if (!(cflag & PARODD))
Mark Fortescue7cc5c852007-05-09 13:49:04 -0700919 up->curregs[R4] |= PAR_EVEN;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700920 else
Mark Fortescue7cc5c852007-05-09 13:49:04 -0700921 up->curregs[R4] &= ~PAR_EVEN;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700922
923 up->port.read_status_mask = Rx_OVR;
924 if (iflag & INPCK)
925 up->port.read_status_mask |= CRC_ERR | PAR_ERR;
926 if (iflag & (BRKINT | PARMRK))
927 up->port.read_status_mask |= BRK_ABRT;
928
929 up->port.ignore_status_mask = 0;
930 if (iflag & IGNPAR)
931 up->port.ignore_status_mask |= CRC_ERR | PAR_ERR;
932 if (iflag & IGNBRK) {
933 up->port.ignore_status_mask |= BRK_ABRT;
934 if (iflag & IGNPAR)
935 up->port.ignore_status_mask |= Rx_OVR;
936 }
937
938 if ((cflag & CREAD) == 0)
939 up->port.ignore_status_mask = 0xff;
940}
941
942/* The port lock is not held. */
943static void
Alan Cox606d0992006-12-08 02:38:45 -0800944sunzilog_set_termios(struct uart_port *port, struct ktermios *termios,
945 struct ktermios *old)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700946{
947 struct uart_sunzilog_port *up = (struct uart_sunzilog_port *) port;
948 unsigned long flags;
949 int baud, brg;
950
951 baud = uart_get_baud_rate(port, termios, old, 1200, 76800);
952
953 spin_lock_irqsave(&up->port.lock, flags);
954
955 brg = BPS_TO_BRG(baud, ZS_CLOCK / ZS_CLOCK_DIVISOR);
956
957 sunzilog_convert_to_zs(up, termios->c_cflag, termios->c_iflag, brg);
958
959 if (UART_ENABLE_MS(&up->port, termios->c_cflag))
960 up->flags |= SUNZILOG_FLAG_MODEM_STATUS;
961 else
962 up->flags &= ~SUNZILOG_FLAG_MODEM_STATUS;
963
964 up->cflag = termios->c_cflag;
965
966 sunzilog_maybe_update_regs(up, ZILOG_CHANNEL_FROM_PORT(port));
967
968 uart_update_timeout(port, termios->c_cflag, baud);
969
970 spin_unlock_irqrestore(&up->port.lock, flags);
971}
972
973static const char *sunzilog_type(struct uart_port *port)
974{
Mark Fortescue7cc5c852007-05-09 13:49:04 -0700975 struct uart_sunzilog_port *up = UART_ZILOG(port);
976
977 return (up->flags & SUNZILOG_FLAG_ESCC) ? "zs (ESCC)" : "zs";
Linus Torvalds1da177e2005-04-16 15:20:36 -0700978}
979
980/* We do not request/release mappings of the registers here, this
981 * happens at early serial probe time.
982 */
983static void sunzilog_release_port(struct uart_port *port)
984{
985}
986
987static int sunzilog_request_port(struct uart_port *port)
988{
989 return 0;
990}
991
992/* These do not need to do anything interesting either. */
993static void sunzilog_config_port(struct uart_port *port, int flags)
994{
995}
996
997/* We do not support letting the user mess with the divisor, IRQ, etc. */
998static int sunzilog_verify_port(struct uart_port *port, struct serial_struct *ser)
999{
1000 return -EINVAL;
1001}
1002
1003static struct uart_ops sunzilog_pops = {
1004 .tx_empty = sunzilog_tx_empty,
1005 .set_mctrl = sunzilog_set_mctrl,
1006 .get_mctrl = sunzilog_get_mctrl,
1007 .stop_tx = sunzilog_stop_tx,
1008 .start_tx = sunzilog_start_tx,
1009 .stop_rx = sunzilog_stop_rx,
1010 .enable_ms = sunzilog_enable_ms,
1011 .break_ctl = sunzilog_break_ctl,
1012 .startup = sunzilog_startup,
1013 .shutdown = sunzilog_shutdown,
1014 .set_termios = sunzilog_set_termios,
1015 .type = sunzilog_type,
1016 .release_port = sunzilog_release_port,
1017 .request_port = sunzilog_request_port,
1018 .config_port = sunzilog_config_port,
1019 .verify_port = sunzilog_verify_port,
1020};
1021
1022static struct uart_sunzilog_port *sunzilog_port_table;
1023static struct zilog_layout __iomem **sunzilog_chip_regs;
1024
1025static struct uart_sunzilog_port *sunzilog_irq_chain;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001026
1027static struct uart_driver sunzilog_reg = {
1028 .owner = THIS_MODULE,
1029 .driver_name = "ttyS",
Linus Torvalds1da177e2005-04-16 15:20:36 -07001030 .dev_name = "ttyS",
1031 .major = TTY_MAJOR,
1032};
1033
David S. Miller36764632006-06-29 15:13:17 -07001034static int __init sunzilog_alloc_tables(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001035{
David S. Miller36764632006-06-29 15:13:17 -07001036 struct uart_sunzilog_port *up;
1037 unsigned long size;
1038 int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001039
David S. Miller36764632006-06-29 15:13:17 -07001040 size = NUM_CHANNELS * sizeof(struct uart_sunzilog_port);
1041 sunzilog_port_table = kzalloc(size, GFP_KERNEL);
1042 if (!sunzilog_port_table)
1043 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001044
David S. Miller36764632006-06-29 15:13:17 -07001045 for (i = 0; i < NUM_CHANNELS; i++) {
1046 up = &sunzilog_port_table[i];
1047
1048 spin_lock_init(&up->port.lock);
1049
1050 if (i == 0)
1051 sunzilog_irq_chain = up;
1052
1053 if (i < NUM_CHANNELS - 1)
1054 up->next = up + 1;
1055 else
1056 up->next = NULL;
1057 }
1058
1059 size = NUM_SUNZILOG * sizeof(struct zilog_layout __iomem *);
1060 sunzilog_chip_regs = kzalloc(size, GFP_KERNEL);
1061 if (!sunzilog_chip_regs) {
1062 kfree(sunzilog_port_table);
1063 sunzilog_irq_chain = NULL;
1064 return -ENOMEM;
1065 }
1066
1067 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001068}
1069
David S. Miller36764632006-06-29 15:13:17 -07001070static void sunzilog_free_tables(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001071{
David S. Miller36764632006-06-29 15:13:17 -07001072 kfree(sunzilog_port_table);
1073 sunzilog_irq_chain = NULL;
1074 kfree(sunzilog_chip_regs);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001075}
1076
1077#define ZS_PUT_CHAR_MAX_DELAY 2000 /* 10 ms */
1078
Russell Kingd3587882006-03-20 20:00:09 +00001079static void sunzilog_putchar(struct uart_port *port, int ch)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001080{
Al Viro48343272006-10-10 22:44:47 +01001081 struct zilog_channel __iomem *channel = ZILOG_CHANNEL_FROM_PORT(port);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001082 int loops = ZS_PUT_CHAR_MAX_DELAY;
1083
1084 /* This is a timed polling loop so do not switch the explicit
1085 * udelay with ZSDELAY as that is a NOP on some platforms. -DaveM
1086 */
1087 do {
David S. Miller36764632006-06-29 15:13:17 -07001088 unsigned char val = readb(&channel->control);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001089 if (val & Tx_BUF_EMP) {
1090 ZSDELAY();
1091 break;
1092 }
1093 udelay(5);
1094 } while (--loops);
1095
David S. Miller36764632006-06-29 15:13:17 -07001096 writeb(ch, &channel->data);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001097 ZSDELAY();
1098 ZS_WSYNC(channel);
1099}
1100
1101#ifdef CONFIG_SERIO
1102
1103static DEFINE_SPINLOCK(sunzilog_serio_lock);
1104
1105static int sunzilog_serio_write(struct serio *serio, unsigned char ch)
1106{
1107 struct uart_sunzilog_port *up = serio->port_data;
1108 unsigned long flags;
1109
1110 spin_lock_irqsave(&sunzilog_serio_lock, flags);
1111
Russell Kingd3587882006-03-20 20:00:09 +00001112 sunzilog_putchar(&up->port, ch);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001113
1114 spin_unlock_irqrestore(&sunzilog_serio_lock, flags);
1115
1116 return 0;
1117}
1118
1119static int sunzilog_serio_open(struct serio *serio)
1120{
1121 struct uart_sunzilog_port *up = serio->port_data;
1122 unsigned long flags;
1123 int ret;
1124
1125 spin_lock_irqsave(&sunzilog_serio_lock, flags);
1126 if (!up->serio_open) {
1127 up->serio_open = 1;
1128 ret = 0;
1129 } else
1130 ret = -EBUSY;
1131 spin_unlock_irqrestore(&sunzilog_serio_lock, flags);
1132
1133 return ret;
1134}
1135
1136static void sunzilog_serio_close(struct serio *serio)
1137{
1138 struct uart_sunzilog_port *up = serio->port_data;
1139 unsigned long flags;
1140
1141 spin_lock_irqsave(&sunzilog_serio_lock, flags);
1142 up->serio_open = 0;
1143 spin_unlock_irqrestore(&sunzilog_serio_lock, flags);
1144}
1145
1146#endif /* CONFIG_SERIO */
1147
1148#ifdef CONFIG_SERIAL_SUNZILOG_CONSOLE
1149static void
1150sunzilog_console_write(struct console *con, const char *s, unsigned int count)
1151{
1152 struct uart_sunzilog_port *up = &sunzilog_port_table[con->index];
Linus Torvalds1da177e2005-04-16 15:20:36 -07001153 unsigned long flags;
David S. Millerf3c681c2007-07-15 23:53:32 -07001154 int locked = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001155
David S. Millerf3c681c2007-07-15 23:53:32 -07001156 local_irq_save(flags);
1157 if (up->port.sysrq) {
1158 locked = 0;
1159 } else if (oops_in_progress) {
1160 locked = spin_trylock(&up->port.lock);
1161 } else
1162 spin_lock(&up->port.lock);
1163
Russell Kingd3587882006-03-20 20:00:09 +00001164 uart_console_write(&up->port, s, count, sunzilog_putchar);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001165 udelay(2);
David S. Millerf3c681c2007-07-15 23:53:32 -07001166
1167 if (locked)
1168 spin_unlock(&up->port.lock);
1169 local_irq_restore(flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001170}
1171
1172static int __init sunzilog_console_setup(struct console *con, char *options)
1173{
1174 struct uart_sunzilog_port *up = &sunzilog_port_table[con->index];
1175 unsigned long flags;
1176 int baud, brg;
1177
David S. Millerb8b99e82006-08-23 15:53:39 -07001178 if (up->port.type != PORT_SUNZILOG)
1179 return -1;
1180
Linus Torvalds1da177e2005-04-16 15:20:36 -07001181 printk(KERN_INFO "Console: ttyS%d (SunZilog zs%d)\n",
1182 (sunzilog_reg.minor - 64) + con->index, con->index);
1183
1184 /* Get firmware console settings. */
1185 sunserial_console_termios(con);
1186
1187 /* Firmware console speed is limited to 150-->38400 baud so
1188 * this hackish cflag thing is OK.
1189 */
1190 switch (con->cflag & CBAUD) {
1191 case B150: baud = 150; break;
1192 case B300: baud = 300; break;
1193 case B600: baud = 600; break;
1194 case B1200: baud = 1200; break;
1195 case B2400: baud = 2400; break;
1196 case B4800: baud = 4800; break;
1197 default: case B9600: baud = 9600; break;
1198 case B19200: baud = 19200; break;
1199 case B38400: baud = 38400; break;
1200 };
1201
1202 brg = BPS_TO_BRG(baud, ZS_CLOCK / ZS_CLOCK_DIVISOR);
1203
1204 spin_lock_irqsave(&up->port.lock, flags);
1205
Mark Fortescue7cc5c852007-05-09 13:49:04 -07001206 up->curregs[R15] |= BRKIE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001207 sunzilog_convert_to_zs(up, con->cflag, 0, brg);
1208
1209 sunzilog_set_mctrl(&up->port, TIOCM_DTR | TIOCM_RTS);
1210 __sunzilog_startup(up);
1211
1212 spin_unlock_irqrestore(&up->port.lock, flags);
1213
1214 return 0;
1215}
1216
Martin Habetseba8cef2006-10-10 14:44:01 -07001217static struct console sunzilog_console_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001218 .name = "ttyS",
1219 .write = sunzilog_console_write,
1220 .device = uart_console_device,
1221 .setup = sunzilog_console_setup,
1222 .flags = CON_PRINTBUFFER,
1223 .index = -1,
1224 .data = &sunzilog_reg,
1225};
Linus Torvalds1da177e2005-04-16 15:20:36 -07001226
David S. Miller1ddb7c92006-02-13 20:09:10 -08001227static inline struct console *SUNZILOG_CONSOLE(void)
1228{
Martin Habetseba8cef2006-10-10 14:44:01 -07001229 return &sunzilog_console_ops;
David S. Miller1ddb7c92006-02-13 20:09:10 -08001230}
1231
Linus Torvalds1da177e2005-04-16 15:20:36 -07001232#else
David S. Miller1ddb7c92006-02-13 20:09:10 -08001233#define SUNZILOG_CONSOLE() (NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001234#endif
1235
Krzysztof Helt9977e392007-05-19 12:06:02 -07001236static void __devinit sunzilog_init_kbdms(struct uart_sunzilog_port *up, int channel)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001237{
1238 int baud, brg;
1239
David S. Miller8a84eb12006-07-19 22:55:08 -07001240 if (up->flags & SUNZILOG_FLAG_CONS_KEYB) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001241 up->cflag = B1200 | CS8 | CLOCAL | CREAD;
1242 baud = 1200;
1243 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001244 up->cflag = B4800 | CS8 | CLOCAL | CREAD;
1245 baud = 4800;
1246 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001247
Mark Fortescue7cc5c852007-05-09 13:49:04 -07001248 up->curregs[R15] |= BRKIE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001249 brg = BPS_TO_BRG(baud, ZS_CLOCK / ZS_CLOCK_DIVISOR);
1250 sunzilog_convert_to_zs(up, up->cflag, 0, brg);
1251 sunzilog_set_mctrl(&up->port, TIOCM_DTR | TIOCM_RTS);
1252 __sunzilog_startup(up);
1253}
1254
1255#ifdef CONFIG_SERIO
Krzysztof Helt9977e392007-05-19 12:06:02 -07001256static void __devinit sunzilog_register_serio(struct uart_sunzilog_port *up)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001257{
David S. Miller36764632006-06-29 15:13:17 -07001258 struct serio *serio = &up->serio;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001259
David S. Miller36764632006-06-29 15:13:17 -07001260 serio->port_data = up;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001261
David S. Miller36764632006-06-29 15:13:17 -07001262 serio->id.type = SERIO_RS232;
David S. Miller8a84eb12006-07-19 22:55:08 -07001263 if (up->flags & SUNZILOG_FLAG_CONS_KEYB) {
David S. Miller36764632006-06-29 15:13:17 -07001264 serio->id.proto = SERIO_SUNKBD;
1265 strlcpy(serio->name, "zskbd", sizeof(serio->name));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001266 } else {
David S. Miller36764632006-06-29 15:13:17 -07001267 serio->id.proto = SERIO_SUN;
1268 serio->id.extra = 1;
1269 strlcpy(serio->name, "zsms", sizeof(serio->name));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001270 }
David S. Miller36764632006-06-29 15:13:17 -07001271 strlcpy(serio->phys,
David S. Miller8a84eb12006-07-19 22:55:08 -07001272 ((up->flags & SUNZILOG_FLAG_CONS_KEYB) ?
1273 "zs/serio0" : "zs/serio1"),
David S. Miller36764632006-06-29 15:13:17 -07001274 sizeof(serio->phys));
1275
1276 serio->write = sunzilog_serio_write;
1277 serio->open = sunzilog_serio_open;
1278 serio->close = sunzilog_serio_close;
1279 serio->dev.parent = up->port.dev;
1280
1281 serio_register_port(serio);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001282}
1283#endif
1284
David S. Millerfbe96f92006-09-27 19:52:35 -07001285static void __devinit sunzilog_init_hw(struct uart_sunzilog_port *up)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001286{
David S. Miller36764632006-06-29 15:13:17 -07001287 struct zilog_channel __iomem *channel;
1288 unsigned long flags;
1289 int baud, brg;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001290
David S. Miller36764632006-06-29 15:13:17 -07001291 channel = ZILOG_CHANNEL_FROM_PORT(&up->port);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001292
David S. Miller36764632006-06-29 15:13:17 -07001293 spin_lock_irqsave(&up->port.lock, flags);
1294 if (ZS_IS_CHANNEL_A(up)) {
1295 write_zsreg(channel, R9, FHWRES);
1296 ZSDELAY_LONG();
1297 (void) read_zsreg(channel, R0);
1298 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001299
David S. Miller8a84eb12006-07-19 22:55:08 -07001300 if (up->flags & (SUNZILOG_FLAG_CONS_KEYB |
1301 SUNZILOG_FLAG_CONS_MOUSE)) {
Mark Fortescue7cc5c852007-05-09 13:49:04 -07001302 up->curregs[R1] = EXT_INT_ENAB | INT_ALL_Rx | TxINT_ENAB;
1303 up->curregs[R4] = PAR_EVEN | X16CLK | SB1;
1304 up->curregs[R3] = RxENAB | Rx8;
1305 up->curregs[R5] = TxENAB | Tx8;
1306 up->curregs[R6] = 0x00; /* SDLC Address */
1307 up->curregs[R7] = 0x7E; /* SDLC Flag */
1308 up->curregs[R9] = NV;
1309 up->curregs[R7p] = 0x00;
David S. Miller36764632006-06-29 15:13:17 -07001310 sunzilog_init_kbdms(up, up->port.line);
Mark Fortescue7cc5c852007-05-09 13:49:04 -07001311 /* Only enable interrupts if an ISR handler available */
1312 if (up->flags & SUNZILOG_FLAG_ISR_HANDLER)
1313 up->curregs[R9] |= MIE;
David S. Miller36764632006-06-29 15:13:17 -07001314 write_zsreg(channel, R9, up->curregs[R9]);
1315 } else {
1316 /* Normal serial TTY. */
1317 up->parity_mask = 0xff;
1318 up->curregs[R1] = EXT_INT_ENAB | INT_ALL_Rx | TxINT_ENAB;
1319 up->curregs[R4] = PAR_EVEN | X16CLK | SB1;
1320 up->curregs[R3] = RxENAB | Rx8;
1321 up->curregs[R5] = TxENAB | Tx8;
Mark Fortescue7cc5c852007-05-09 13:49:04 -07001322 up->curregs[R6] = 0x00; /* SDLC Address */
1323 up->curregs[R7] = 0x7E; /* SDLC Flag */
1324 up->curregs[R9] = NV;
David S. Miller36764632006-06-29 15:13:17 -07001325 up->curregs[R10] = NRZ;
1326 up->curregs[R11] = TCBR | RCBR;
1327 baud = 9600;
1328 brg = BPS_TO_BRG(baud, ZS_CLOCK / ZS_CLOCK_DIVISOR);
1329 up->curregs[R12] = (brg & 0xff);
1330 up->curregs[R13] = (brg >> 8) & 0xff;
1331 up->curregs[R14] = BRSRC | BRENAB;
Mark Fortescue7cc5c852007-05-09 13:49:04 -07001332 up->curregs[R15] = FIFOEN; /* Use FIFO if on ESCC */
1333 up->curregs[R7p] = TxFIFO_LVL | RxFIFO_LVL;
1334 if (__load_zsregs(channel, up->curregs)) {
1335 up->flags |= SUNZILOG_FLAG_ESCC;
1336 }
1337 /* Only enable interrupts if an ISR handler available */
1338 if (up->flags & SUNZILOG_FLAG_ISR_HANDLER)
1339 up->curregs[R9] |= MIE;
David S. Miller36764632006-06-29 15:13:17 -07001340 write_zsreg(channel, R9, up->curregs[R9]);
1341 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001342
David S. Miller36764632006-06-29 15:13:17 -07001343 spin_unlock_irqrestore(&up->port.lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001344
1345#ifdef CONFIG_SERIO
David S. Miller8a84eb12006-07-19 22:55:08 -07001346 if (up->flags & (SUNZILOG_FLAG_CONS_KEYB |
1347 SUNZILOG_FLAG_CONS_MOUSE))
1348 sunzilog_register_serio(up);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001349#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001350}
1351
David S. Miller4fa97dc2006-06-29 15:13:40 -07001352static int zilog_irq = -1;
1353
David S. Miller67e23a12006-07-17 21:07:17 -07001354static int __devinit zs_probe(struct of_device *op, const struct of_device_id *match)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001355{
David S. Miller8a84eb12006-07-19 22:55:08 -07001356 static int inst;
David S. Miller36764632006-06-29 15:13:17 -07001357 struct uart_sunzilog_port *up;
1358 struct zilog_layout __iomem *rp;
David S. Miller8a84eb12006-07-19 22:55:08 -07001359 int keyboard_mouse;
David S. Miller36764632006-06-29 15:13:17 -07001360 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001361
David S. Miller8a84eb12006-07-19 22:55:08 -07001362 keyboard_mouse = 0;
1363 if (of_find_property(op->node, "keyboard", NULL))
1364 keyboard_mouse = 1;
1365
David S. Miller36764632006-06-29 15:13:17 -07001366 sunzilog_chip_regs[inst] = of_ioremap(&op->resource[0], 0,
1367 sizeof(struct zilog_layout),
1368 "zs");
1369 if (!sunzilog_chip_regs[inst])
1370 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001371
David S. Miller36764632006-06-29 15:13:17 -07001372 rp = sunzilog_chip_regs[inst];
Linus Torvalds1da177e2005-04-16 15:20:36 -07001373
David S. Millerb77d35b2006-07-19 21:04:04 -07001374 if (zilog_irq == -1)
David S. Miller36764632006-06-29 15:13:17 -07001375 zilog_irq = op->irqs[0];
Linus Torvalds1da177e2005-04-16 15:20:36 -07001376
David S. Miller36764632006-06-29 15:13:17 -07001377 up = &sunzilog_port_table[inst * 2];
Linus Torvalds1da177e2005-04-16 15:20:36 -07001378
David S. Miller36764632006-06-29 15:13:17 -07001379 /* Channel A */
1380 up[0].port.mapbase = op->resource[0].start + 0x00;
1381 up[0].port.membase = (void __iomem *) &rp->channelA;
1382 up[0].port.iotype = UPIO_MEM;
1383 up[0].port.irq = op->irqs[0];
1384 up[0].port.uartclk = ZS_CLOCK;
1385 up[0].port.fifosize = 1;
1386 up[0].port.ops = &sunzilog_pops;
1387 up[0].port.type = PORT_SUNZILOG;
1388 up[0].port.flags = 0;
1389 up[0].port.line = (inst * 2) + 0;
1390 up[0].port.dev = &op->dev;
1391 up[0].flags |= SUNZILOG_FLAG_IS_CHANNEL_A;
David S. Miller8a84eb12006-07-19 22:55:08 -07001392 if (keyboard_mouse)
David S. Miller36764632006-06-29 15:13:17 -07001393 up[0].flags |= SUNZILOG_FLAG_CONS_KEYB;
1394 sunzilog_init_hw(&up[0]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001395
David S. Miller36764632006-06-29 15:13:17 -07001396 /* Channel B */
1397 up[1].port.mapbase = op->resource[0].start + 0x04;
1398 up[1].port.membase = (void __iomem *) &rp->channelB;
1399 up[1].port.iotype = UPIO_MEM;
1400 up[1].port.irq = op->irqs[0];
1401 up[1].port.uartclk = ZS_CLOCK;
1402 up[1].port.fifosize = 1;
1403 up[1].port.ops = &sunzilog_pops;
1404 up[1].port.type = PORT_SUNZILOG;
1405 up[1].port.flags = 0;
1406 up[1].port.line = (inst * 2) + 1;
1407 up[1].port.dev = &op->dev;
1408 up[1].flags |= 0;
David S. Miller8a84eb12006-07-19 22:55:08 -07001409 if (keyboard_mouse)
David S. Miller36764632006-06-29 15:13:17 -07001410 up[1].flags |= SUNZILOG_FLAG_CONS_MOUSE;
1411 sunzilog_init_hw(&up[1]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001412
David S. Miller8a84eb12006-07-19 22:55:08 -07001413 if (!keyboard_mouse) {
David S. Millerc73fcc82007-07-20 16:59:26 -07001414 if (sunserial_console_match(SUNZILOG_CONSOLE(), op->node,
1415 &sunzilog_reg, up[0].port.line))
1416 up->flags |= SUNZILOG_FLAG_IS_CONS;
David S. Miller36764632006-06-29 15:13:17 -07001417 err = uart_add_one_port(&sunzilog_reg, &up[0].port);
1418 if (err) {
David S. Millere3a411a32006-12-28 21:01:32 -08001419 of_iounmap(&op->resource[0],
1420 rp, sizeof(struct zilog_layout));
David S. Miller36764632006-06-29 15:13:17 -07001421 return err;
1422 }
David S. Millerc73fcc82007-07-20 16:59:26 -07001423 if (sunserial_console_match(SUNZILOG_CONSOLE(), op->node,
1424 &sunzilog_reg, up[1].port.line))
1425 up->flags |= SUNZILOG_FLAG_IS_CONS;
David S. Miller36764632006-06-29 15:13:17 -07001426 err = uart_add_one_port(&sunzilog_reg, &up[1].port);
1427 if (err) {
1428 uart_remove_one_port(&sunzilog_reg, &up[0].port);
David S. Millere3a411a32006-12-28 21:01:32 -08001429 of_iounmap(&op->resource[0],
1430 rp, sizeof(struct zilog_layout));
David S. Miller36764632006-06-29 15:13:17 -07001431 return err;
1432 }
David S. Miller8a84eb12006-07-19 22:55:08 -07001433 } else {
David S. Miller4f1296a2007-08-25 15:17:31 -07001434 printk(KERN_INFO "%s: Keyboard at MMIO 0x%llx (irq = %d) "
Mark Fortescue7cc5c852007-05-09 13:49:04 -07001435 "is a %s\n",
David S. Miller4f1296a2007-08-25 15:17:31 -07001436 op->dev.bus_id,
1437 (unsigned long long) up[0].port.mapbase,
1438 op->irqs[0], sunzilog_type(&up[0].port));
1439 printk(KERN_INFO "%s: Mouse at MMIO 0x%llx (irq = %d) "
Mark Fortescue7cc5c852007-05-09 13:49:04 -07001440 "is a %s\n",
David S. Miller4f1296a2007-08-25 15:17:31 -07001441 op->dev.bus_id,
1442 (unsigned long long) up[1].port.mapbase,
1443 op->irqs[0], sunzilog_type(&up[1].port));
David S. Miller36764632006-06-29 15:13:17 -07001444 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001445
David S. Miller67e23a12006-07-17 21:07:17 -07001446 dev_set_drvdata(&op->dev, &up[0]);
David S. Miller4fa97dc2006-06-29 15:13:40 -07001447
David S. Miller8a84eb12006-07-19 22:55:08 -07001448 inst++;
1449
Linus Torvalds1da177e2005-04-16 15:20:36 -07001450 return 0;
1451}
1452
David S. Miller4fa97dc2006-06-29 15:13:40 -07001453static void __devexit zs_remove_one(struct uart_sunzilog_port *up)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001454{
David S. Miller36764632006-06-29 15:13:17 -07001455 if (ZS_IS_KEYB(up) || ZS_IS_MOUSE(up)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001456#ifdef CONFIG_SERIO
David S. Miller36764632006-06-29 15:13:17 -07001457 serio_unregister_port(&up->serio);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001458#endif
David S. Miller36764632006-06-29 15:13:17 -07001459 } else
1460 uart_remove_one_port(&sunzilog_reg, &up->port);
David S. Miller4fa97dc2006-06-29 15:13:40 -07001461}
David S. Miller36764632006-06-29 15:13:17 -07001462
David S. Millere3a411a32006-12-28 21:01:32 -08001463static int __devexit zs_remove(struct of_device *op)
David S. Miller4fa97dc2006-06-29 15:13:40 -07001464{
David S. Millere3a411a32006-12-28 21:01:32 -08001465 struct uart_sunzilog_port *up = dev_get_drvdata(&op->dev);
David S. Miller4fa97dc2006-06-29 15:13:40 -07001466 struct zilog_layout __iomem *regs;
David S. Miller36764632006-06-29 15:13:17 -07001467
David S. Miller4fa97dc2006-06-29 15:13:40 -07001468 zs_remove_one(&up[0]);
1469 zs_remove_one(&up[1]);
1470
1471 regs = sunzilog_chip_regs[up[0].port.line / 2];
David S. Millere3a411a32006-12-28 21:01:32 -08001472 of_iounmap(&op->resource[0], regs, sizeof(struct zilog_layout));
David S. Miller4fa97dc2006-06-29 15:13:40 -07001473
David S. Millere3a411a32006-12-28 21:01:32 -08001474 dev_set_drvdata(&op->dev, NULL);
David S. Miller36764632006-06-29 15:13:17 -07001475
1476 return 0;
1477}
1478
1479static struct of_device_id zs_match[] = {
1480 {
1481 .name = "zs",
1482 },
1483 {},
1484};
1485MODULE_DEVICE_TABLE(of, zs_match);
1486
1487static struct of_platform_driver zs_driver = {
1488 .name = "zs",
1489 .match_table = zs_match,
1490 .probe = zs_probe,
1491 .remove = __devexit_p(zs_remove),
1492};
1493
1494static int __init sunzilog_init(void)
1495{
1496 struct device_node *dp;
David S. Miller67e23a12006-07-17 21:07:17 -07001497 int err, uart_count;
David S. Miller8a84eb12006-07-19 22:55:08 -07001498 int num_keybms;
David S. Miller36764632006-06-29 15:13:17 -07001499
1500 NUM_SUNZILOG = 0;
David S. Miller8a84eb12006-07-19 22:55:08 -07001501 num_keybms = 0;
1502 for_each_node_by_name(dp, "zs") {
David S. Miller36764632006-06-29 15:13:17 -07001503 NUM_SUNZILOG++;
David S. Miller8a84eb12006-07-19 22:55:08 -07001504 if (of_find_property(dp, "keyboard", NULL))
1505 num_keybms++;
1506 }
David S. Miller36764632006-06-29 15:13:17 -07001507
David S. Miller67e23a12006-07-17 21:07:17 -07001508 uart_count = 0;
David S. Miller36764632006-06-29 15:13:17 -07001509 if (NUM_SUNZILOG) {
1510 int uart_count;
1511
1512 err = sunzilog_alloc_tables();
1513 if (err)
David S. Miller67e23a12006-07-17 21:07:17 -07001514 goto out;
David S. Miller36764632006-06-29 15:13:17 -07001515
David S. Miller8a84eb12006-07-19 22:55:08 -07001516 uart_count = (NUM_SUNZILOG * 2) - (2 * num_keybms);
David S. Miller36764632006-06-29 15:13:17 -07001517
1518 sunzilog_reg.nr = uart_count;
1519 sunzilog_reg.minor = sunserial_current_minor;
1520 err = uart_register_driver(&sunzilog_reg);
David S. Miller67e23a12006-07-17 21:07:17 -07001521 if (err)
1522 goto out_free_tables;
1523
David S. Miller36764632006-06-29 15:13:17 -07001524 sunzilog_reg.tty_driver->name_base = sunzilog_reg.minor - 64;
David S. Miller36764632006-06-29 15:13:17 -07001525
1526 sunserial_current_minor += uart_count;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001527 }
1528
David S. Miller67e23a12006-07-17 21:07:17 -07001529 err = of_register_driver(&zs_driver, &of_bus_type);
1530 if (err)
1531 goto out_unregister_uart;
1532
1533 if (zilog_irq != -1) {
Mark Fortescue7cc5c852007-05-09 13:49:04 -07001534 struct uart_sunzilog_port *up = sunzilog_irq_chain;
David S. Miller67e23a12006-07-17 21:07:17 -07001535 err = request_irq(zilog_irq, sunzilog_interrupt, IRQF_SHARED,
1536 "zs", sunzilog_irq_chain);
1537 if (err)
1538 goto out_unregister_driver;
Mark Fortescue7cc5c852007-05-09 13:49:04 -07001539
1540 /* Enable Interrupts */
1541 while (up) {
1542 struct zilog_channel __iomem *channel;
1543
1544 /* printk (KERN_INFO "Enable IRQ for ZILOG Hardware %p\n", up); */
1545 channel = ZILOG_CHANNEL_FROM_PORT(&up->port);
1546 up->flags |= SUNZILOG_FLAG_ISR_HANDLER;
1547 up->curregs[R9] |= MIE;
1548 write_zsreg(channel, R9, up->curregs[R9]);
1549 up = up->next;
1550 }
David S. Miller67e23a12006-07-17 21:07:17 -07001551 }
1552
1553out:
1554 return err;
1555
1556out_unregister_driver:
1557 of_unregister_driver(&zs_driver);
1558
1559out_unregister_uart:
1560 if (NUM_SUNZILOG) {
1561 uart_unregister_driver(&sunzilog_reg);
1562 sunzilog_reg.cons = NULL;
1563 }
1564
1565out_free_tables:
1566 sunzilog_free_tables();
1567 goto out;
David S. Miller36764632006-06-29 15:13:17 -07001568}
1569
1570static void __exit sunzilog_exit(void)
1571{
1572 of_unregister_driver(&zs_driver);
1573
David S. Miller4fa97dc2006-06-29 15:13:40 -07001574 if (zilog_irq != -1) {
Mark Fortescue7cc5c852007-05-09 13:49:04 -07001575 struct uart_sunzilog_port *up = sunzilog_irq_chain;
1576
1577 /* Disable Interrupts */
1578 while (up) {
1579 struct zilog_channel __iomem *channel;
1580
1581 /* printk (KERN_INFO "Disable IRQ for ZILOG Hardware %p\n", up); */
1582 channel = ZILOG_CHANNEL_FROM_PORT(&up->port);
1583 up->flags &= ~SUNZILOG_FLAG_ISR_HANDLER;
1584 up->curregs[R9] &= ~MIE;
1585 write_zsreg(channel, R9, up->curregs[R9]);
1586 up = up->next;
1587 }
1588
David S. Miller4fa97dc2006-06-29 15:13:40 -07001589 free_irq(zilog_irq, sunzilog_irq_chain);
1590 zilog_irq = -1;
1591 }
1592
David S. Miller36764632006-06-29 15:13:17 -07001593 if (NUM_SUNZILOG) {
1594 uart_unregister_driver(&sunzilog_reg);
1595 sunzilog_free_tables();
1596 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001597}
1598
1599module_init(sunzilog_init);
1600module_exit(sunzilog_exit);
1601
1602MODULE_AUTHOR("David S. Miller");
1603MODULE_DESCRIPTION("Sun Zilog serial port driver");
David S. Miller9efc3712006-06-29 15:14:17 -07001604MODULE_VERSION("2.0");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001605MODULE_LICENSE("GPL");