Commit | Line | Data |
---|---|---|
36764631 | 1 | /* sunzilog.c: Zilog serial driver for Sparc systems. |
1da177e4 LT |
2 | * |
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 | * | |
36764631 | 12 | * Copyright (C) 2002, 2006 David S. Miller (davem@davemloft.net) |
1da177e4 LT |
13 | */ |
14 | ||
1da177e4 LT |
15 | #include <linux/module.h> |
16 | #include <linux/kernel.h> | |
1da177e4 LT |
17 | #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> | |
36764631 DM |
38 | #include <asm/prom.h> |
39 | #include <asm/of_device.h> | |
1da177e4 LT |
40 | |
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) \ | |
36764631 | 63 | readb(&((__channel)->control)) |
1da177e4 LT |
64 | #endif |
65 | ||
66 | static int num_sunzilog; | |
67 | #define NUM_SUNZILOG num_sunzilog | |
68 | #define NUM_CHANNELS (NUM_SUNZILOG * 2) | |
69 | ||
1da177e4 LT |
70 | #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 | */ | |
76 | struct 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 | |
95 | ||
96 | unsigned int cflag; | |
97 | ||
98 | unsigned char parity_mask; | |
99 | unsigned char prev_status; | |
100 | ||
101 | #ifdef CONFIG_SERIO | |
36764631 | 102 | struct serio serio; |
1da177e4 LT |
103 | int serio_open; |
104 | #endif | |
105 | }; | |
106 | ||
107 | #define ZILOG_CHANNEL_FROM_PORT(PORT) ((struct zilog_channel __iomem *)((PORT)->membase)) | |
108 | #define UART_ZILOG(PORT) ((struct uart_sunzilog_port *)(PORT)) | |
109 | ||
110 | #define ZS_IS_KEYB(UP) ((UP)->flags & SUNZILOG_FLAG_CONS_KEYB) | |
111 | #define ZS_IS_MOUSE(UP) ((UP)->flags & SUNZILOG_FLAG_CONS_MOUSE) | |
112 | #define ZS_IS_CONS(UP) ((UP)->flags & SUNZILOG_FLAG_IS_CONS) | |
113 | #define ZS_IS_KGDB(UP) ((UP)->flags & SUNZILOG_FLAG_IS_KGDB) | |
114 | #define ZS_WANTS_MODEM_STATUS(UP) ((UP)->flags & SUNZILOG_FLAG_MODEM_STATUS) | |
115 | #define ZS_IS_CHANNEL_A(UP) ((UP)->flags & SUNZILOG_FLAG_IS_CHANNEL_A) | |
116 | #define ZS_REGS_HELD(UP) ((UP)->flags & SUNZILOG_FLAG_REGS_HELD) | |
117 | #define ZS_TX_STOPPED(UP) ((UP)->flags & SUNZILOG_FLAG_TX_STOPPED) | |
118 | #define ZS_TX_ACTIVE(UP) ((UP)->flags & SUNZILOG_FLAG_TX_ACTIVE) | |
119 | ||
120 | /* Reading and writing Zilog8530 registers. The delays are to make this | |
121 | * driver work on the Sun4 which needs a settling delay after each chip | |
122 | * register access, other machines handle this in hardware via auxiliary | |
123 | * flip-flops which implement the settle time we do in software. | |
124 | * | |
125 | * The port lock must be held and local IRQs must be disabled | |
126 | * when {read,write}_zsreg is invoked. | |
127 | */ | |
128 | static unsigned char read_zsreg(struct zilog_channel __iomem *channel, | |
129 | unsigned char reg) | |
130 | { | |
131 | unsigned char retval; | |
132 | ||
36764631 | 133 | writeb(reg, &channel->control); |
1da177e4 | 134 | ZSDELAY(); |
36764631 | 135 | retval = readb(&channel->control); |
1da177e4 LT |
136 | ZSDELAY(); |
137 | ||
138 | return retval; | |
139 | } | |
140 | ||
141 | static void write_zsreg(struct zilog_channel __iomem *channel, | |
142 | unsigned char reg, unsigned char value) | |
143 | { | |
36764631 | 144 | writeb(reg, &channel->control); |
1da177e4 | 145 | ZSDELAY(); |
36764631 | 146 | writeb(value, &channel->control); |
1da177e4 LT |
147 | ZSDELAY(); |
148 | } | |
149 | ||
150 | static void sunzilog_clear_fifo(struct zilog_channel __iomem *channel) | |
151 | { | |
152 | int i; | |
153 | ||
154 | for (i = 0; i < 32; i++) { | |
155 | unsigned char regval; | |
156 | ||
36764631 | 157 | regval = readb(&channel->control); |
1da177e4 LT |
158 | ZSDELAY(); |
159 | if (regval & Rx_CH_AV) | |
160 | break; | |
161 | ||
162 | regval = read_zsreg(channel, R1); | |
36764631 | 163 | readb(&channel->data); |
1da177e4 LT |
164 | ZSDELAY(); |
165 | ||
166 | if (regval & (PAR_ERR | Rx_OVR | CRC_ERR)) { | |
36764631 | 167 | writeb(ERR_RES, &channel->control); |
1da177e4 LT |
168 | ZSDELAY(); |
169 | ZS_WSYNC(channel); | |
170 | } | |
171 | } | |
172 | } | |
173 | ||
174 | /* This function must only be called when the TX is not busy. The UART | |
175 | * port lock must be held and local interrupts disabled. | |
176 | */ | |
177 | static void __load_zsregs(struct zilog_channel __iomem *channel, unsigned char *regs) | |
178 | { | |
179 | int i; | |
180 | ||
181 | /* Let pending transmits finish. */ | |
182 | for (i = 0; i < 1000; i++) { | |
183 | unsigned char stat = read_zsreg(channel, R1); | |
184 | if (stat & ALL_SNT) | |
185 | break; | |
186 | udelay(100); | |
187 | } | |
188 | ||
36764631 | 189 | writeb(ERR_RES, &channel->control); |
1da177e4 LT |
190 | ZSDELAY(); |
191 | ZS_WSYNC(channel); | |
192 | ||
193 | sunzilog_clear_fifo(channel); | |
194 | ||
195 | /* Disable all interrupts. */ | |
196 | write_zsreg(channel, R1, | |
197 | regs[R1] & ~(RxINT_MASK | TxINT_ENAB | EXT_INT_ENAB)); | |
198 | ||
199 | /* Set parity, sync config, stop bits, and clock divisor. */ | |
200 | write_zsreg(channel, R4, regs[R4]); | |
201 | ||
202 | /* Set misc. TX/RX control bits. */ | |
203 | write_zsreg(channel, R10, regs[R10]); | |
204 | ||
205 | /* Set TX/RX controls sans the enable bits. */ | |
206 | write_zsreg(channel, R3, regs[R3] & ~RxENAB); | |
207 | write_zsreg(channel, R5, regs[R5] & ~TxENAB); | |
208 | ||
209 | /* Synchronous mode config. */ | |
210 | write_zsreg(channel, R6, regs[R6]); | |
211 | write_zsreg(channel, R7, regs[R7]); | |
212 | ||
213 | /* Don't mess with the interrupt vector (R2, unused by us) and | |
214 | * master interrupt control (R9). We make sure this is setup | |
215 | * properly at probe time then never touch it again. | |
216 | */ | |
217 | ||
218 | /* Disable baud generator. */ | |
219 | write_zsreg(channel, R14, regs[R14] & ~BRENAB); | |
220 | ||
221 | /* Clock mode control. */ | |
222 | write_zsreg(channel, R11, regs[R11]); | |
223 | ||
224 | /* Lower and upper byte of baud rate generator divisor. */ | |
225 | write_zsreg(channel, R12, regs[R12]); | |
226 | write_zsreg(channel, R13, regs[R13]); | |
227 | ||
228 | /* Now rewrite R14, with BRENAB (if set). */ | |
229 | write_zsreg(channel, R14, regs[R14]); | |
230 | ||
231 | /* External status interrupt control. */ | |
232 | write_zsreg(channel, R15, regs[R15]); | |
233 | ||
234 | /* Reset external status interrupts. */ | |
235 | write_zsreg(channel, R0, RES_EXT_INT); | |
236 | write_zsreg(channel, R0, RES_EXT_INT); | |
237 | ||
238 | /* Rewrite R3/R5, this time without enables masked. */ | |
239 | write_zsreg(channel, R3, regs[R3]); | |
240 | write_zsreg(channel, R5, regs[R5]); | |
241 | ||
242 | /* Rewrite R1, this time without IRQ enabled masked. */ | |
243 | write_zsreg(channel, R1, regs[R1]); | |
244 | } | |
245 | ||
246 | /* Reprogram the Zilog channel HW registers with the copies found in the | |
247 | * software state struct. If the transmitter is busy, we defer this update | |
248 | * until the next TX complete interrupt. Else, we do it right now. | |
249 | * | |
250 | * The UART port lock must be held and local interrupts disabled. | |
251 | */ | |
252 | static void sunzilog_maybe_update_regs(struct uart_sunzilog_port *up, | |
253 | struct zilog_channel __iomem *channel) | |
254 | { | |
255 | if (!ZS_REGS_HELD(up)) { | |
256 | if (ZS_TX_ACTIVE(up)) { | |
257 | up->flags |= SUNZILOG_FLAG_REGS_HELD; | |
258 | } else { | |
259 | __load_zsregs(channel, up->curregs); | |
260 | } | |
261 | } | |
262 | } | |
263 | ||
264 | static void sunzilog_change_mouse_baud(struct uart_sunzilog_port *up) | |
265 | { | |
266 | unsigned int cur_cflag = up->cflag; | |
267 | int brg, new_baud; | |
268 | ||
269 | up->cflag &= ~CBAUD; | |
270 | up->cflag |= suncore_mouse_baud_cflag_next(cur_cflag, &new_baud); | |
271 | ||
272 | brg = BPS_TO_BRG(new_baud, ZS_CLOCK / ZS_CLOCK_DIVISOR); | |
273 | up->curregs[R12] = (brg & 0xff); | |
274 | up->curregs[R13] = (brg >> 8) & 0xff; | |
275 | sunzilog_maybe_update_regs(up, ZILOG_CHANNEL_FROM_PORT(&up->port)); | |
276 | } | |
277 | ||
278 | static void sunzilog_kbdms_receive_chars(struct uart_sunzilog_port *up, | |
7d12e780 | 279 | unsigned char ch, int is_break) |
1da177e4 LT |
280 | { |
281 | if (ZS_IS_KEYB(up)) { | |
282 | /* Stop-A is handled by drivers/char/keyboard.c now. */ | |
283 | #ifdef CONFIG_SERIO | |
284 | if (up->serio_open) | |
7d12e780 | 285 | serio_interrupt(&up->serio, ch, 0); |
1da177e4 LT |
286 | #endif |
287 | } else if (ZS_IS_MOUSE(up)) { | |
288 | int ret = suncore_mouse_baud_detection(ch, is_break); | |
289 | ||
290 | switch (ret) { | |
291 | case 2: | |
292 | sunzilog_change_mouse_baud(up); | |
293 | /* fallthru */ | |
294 | case 1: | |
295 | break; | |
296 | ||
297 | case 0: | |
298 | #ifdef CONFIG_SERIO | |
299 | if (up->serio_open) | |
7d12e780 | 300 | serio_interrupt(&up->serio, ch, 0); |
1da177e4 LT |
301 | #endif |
302 | break; | |
303 | }; | |
304 | } | |
305 | } | |
306 | ||
307 | static struct tty_struct * | |
308 | sunzilog_receive_chars(struct uart_sunzilog_port *up, | |
7d12e780 | 309 | struct zilog_channel __iomem *channel) |
1da177e4 LT |
310 | { |
311 | struct tty_struct *tty; | |
33f0f88f | 312 | unsigned char ch, r1, flag; |
1da177e4 LT |
313 | |
314 | tty = NULL; | |
315 | if (up->port.info != NULL && /* Unopened serial console */ | |
316 | up->port.info->tty != NULL) /* Keyboard || mouse */ | |
317 | tty = up->port.info->tty; | |
318 | ||
319 | for (;;) { | |
320 | ||
321 | r1 = read_zsreg(channel, R1); | |
322 | if (r1 & (PAR_ERR | Rx_OVR | CRC_ERR)) { | |
36764631 | 323 | writeb(ERR_RES, &channel->control); |
1da177e4 LT |
324 | ZSDELAY(); |
325 | ZS_WSYNC(channel); | |
326 | } | |
327 | ||
36764631 | 328 | ch = readb(&channel->control); |
1da177e4 LT |
329 | ZSDELAY(); |
330 | ||
331 | /* This funny hack depends upon BRK_ABRT not interfering | |
332 | * with the other bits we care about in R1. | |
333 | */ | |
334 | if (ch & BRK_ABRT) | |
335 | r1 |= BRK_ABRT; | |
336 | ||
337 | if (!(ch & Rx_CH_AV)) | |
338 | break; | |
339 | ||
36764631 | 340 | ch = readb(&channel->data); |
1da177e4 LT |
341 | ZSDELAY(); |
342 | ||
343 | ch &= up->parity_mask; | |
344 | ||
345 | if (unlikely(ZS_IS_KEYB(up)) || unlikely(ZS_IS_MOUSE(up))) { | |
7d12e780 | 346 | sunzilog_kbdms_receive_chars(up, ch, 0); |
1da177e4 LT |
347 | continue; |
348 | } | |
349 | ||
350 | if (tty == NULL) { | |
7d12e780 | 351 | uart_handle_sysrq_char(&up->port, ch); |
1da177e4 LT |
352 | continue; |
353 | } | |
354 | ||
1da177e4 | 355 | /* A real serial line, record the character and status. */ |
33f0f88f | 356 | flag = TTY_NORMAL; |
1da177e4 LT |
357 | up->port.icount.rx++; |
358 | if (r1 & (BRK_ABRT | PAR_ERR | Rx_OVR | CRC_ERR)) { | |
359 | if (r1 & BRK_ABRT) { | |
360 | r1 &= ~(PAR_ERR | CRC_ERR); | |
361 | up->port.icount.brk++; | |
362 | if (uart_handle_break(&up->port)) | |
363 | continue; | |
364 | } | |
365 | else if (r1 & PAR_ERR) | |
366 | up->port.icount.parity++; | |
367 | else if (r1 & CRC_ERR) | |
368 | up->port.icount.frame++; | |
369 | if (r1 & Rx_OVR) | |
370 | up->port.icount.overrun++; | |
371 | r1 &= up->port.read_status_mask; | |
372 | if (r1 & BRK_ABRT) | |
33f0f88f | 373 | flag = TTY_BREAK; |
1da177e4 | 374 | else if (r1 & PAR_ERR) |
33f0f88f | 375 | flag = TTY_PARITY; |
1da177e4 | 376 | else if (r1 & CRC_ERR) |
33f0f88f | 377 | flag = TTY_FRAME; |
1da177e4 | 378 | } |
7d12e780 | 379 | if (uart_handle_sysrq_char(&up->port, ch)) |
1da177e4 LT |
380 | continue; |
381 | ||
382 | if (up->port.ignore_status_mask == 0xff || | |
383 | (r1 & up->port.ignore_status_mask) == 0) { | |
33f0f88f | 384 | tty_insert_flip_char(tty, ch, flag); |
1da177e4 | 385 | } |
33f0f88f AC |
386 | if (r1 & Rx_OVR) |
387 | tty_insert_flip_char(tty, 0, TTY_OVERRUN); | |
1da177e4 LT |
388 | } |
389 | ||
390 | return tty; | |
391 | } | |
392 | ||
393 | static void sunzilog_status_handle(struct uart_sunzilog_port *up, | |
7d12e780 | 394 | struct zilog_channel __iomem *channel) |
1da177e4 LT |
395 | { |
396 | unsigned char status; | |
397 | ||
36764631 | 398 | status = readb(&channel->control); |
1da177e4 LT |
399 | ZSDELAY(); |
400 | ||
36764631 | 401 | writeb(RES_EXT_INT, &channel->control); |
1da177e4 LT |
402 | ZSDELAY(); |
403 | ZS_WSYNC(channel); | |
404 | ||
405 | if (status & BRK_ABRT) { | |
406 | if (ZS_IS_MOUSE(up)) | |
7d12e780 | 407 | sunzilog_kbdms_receive_chars(up, 0, 1); |
1da177e4 LT |
408 | if (ZS_IS_CONS(up)) { |
409 | /* Wait for BREAK to deassert to avoid potentially | |
410 | * confusing the PROM. | |
411 | */ | |
412 | while (1) { | |
36764631 | 413 | status = readb(&channel->control); |
1da177e4 LT |
414 | ZSDELAY(); |
415 | if (!(status & BRK_ABRT)) | |
416 | break; | |
417 | } | |
418 | sun_do_break(); | |
419 | return; | |
420 | } | |
421 | } | |
422 | ||
423 | if (ZS_WANTS_MODEM_STATUS(up)) { | |
424 | if (status & SYNC) | |
425 | up->port.icount.dsr++; | |
426 | ||
427 | /* The Zilog just gives us an interrupt when DCD/CTS/etc. change. | |
428 | * But it does not tell us which bit has changed, we have to keep | |
429 | * track of this ourselves. | |
430 | */ | |
431 | if ((status ^ up->prev_status) ^ DCD) | |
432 | uart_handle_dcd_change(&up->port, | |
433 | (status & DCD)); | |
434 | if ((status ^ up->prev_status) ^ CTS) | |
435 | uart_handle_cts_change(&up->port, | |
436 | (status & CTS)); | |
437 | ||
438 | wake_up_interruptible(&up->port.info->delta_msr_wait); | |
439 | } | |
440 | ||
441 | up->prev_status = status; | |
442 | } | |
443 | ||
444 | static void sunzilog_transmit_chars(struct uart_sunzilog_port *up, | |
445 | struct zilog_channel __iomem *channel) | |
446 | { | |
447 | struct circ_buf *xmit; | |
448 | ||
449 | if (ZS_IS_CONS(up)) { | |
36764631 | 450 | unsigned char status = readb(&channel->control); |
1da177e4 LT |
451 | ZSDELAY(); |
452 | ||
453 | /* TX still busy? Just wait for the next TX done interrupt. | |
454 | * | |
455 | * It can occur because of how we do serial console writes. It would | |
456 | * be nice to transmit console writes just like we normally would for | |
457 | * a TTY line. (ie. buffered and TX interrupt driven). That is not | |
458 | * easy because console writes cannot sleep. One solution might be | |
459 | * to poll on enough port->xmit space becomming free. -DaveM | |
460 | */ | |
461 | if (!(status & Tx_BUF_EMP)) | |
462 | return; | |
463 | } | |
464 | ||
465 | up->flags &= ~SUNZILOG_FLAG_TX_ACTIVE; | |
466 | ||
467 | if (ZS_REGS_HELD(up)) { | |
468 | __load_zsregs(channel, up->curregs); | |
469 | up->flags &= ~SUNZILOG_FLAG_REGS_HELD; | |
470 | } | |
471 | ||
472 | if (ZS_TX_STOPPED(up)) { | |
473 | up->flags &= ~SUNZILOG_FLAG_TX_STOPPED; | |
474 | goto ack_tx_int; | |
475 | } | |
476 | ||
477 | if (up->port.x_char) { | |
478 | up->flags |= SUNZILOG_FLAG_TX_ACTIVE; | |
36764631 | 479 | writeb(up->port.x_char, &channel->data); |
1da177e4 LT |
480 | ZSDELAY(); |
481 | ZS_WSYNC(channel); | |
482 | ||
483 | up->port.icount.tx++; | |
484 | up->port.x_char = 0; | |
485 | return; | |
486 | } | |
487 | ||
488 | if (up->port.info == NULL) | |
489 | goto ack_tx_int; | |
490 | xmit = &up->port.info->xmit; | |
b8df110f | 491 | if (uart_circ_empty(xmit)) |
1da177e4 | 492 | goto ack_tx_int; |
b8df110f | 493 | |
1da177e4 LT |
494 | if (uart_tx_stopped(&up->port)) |
495 | goto ack_tx_int; | |
496 | ||
497 | up->flags |= SUNZILOG_FLAG_TX_ACTIVE; | |
36764631 | 498 | writeb(xmit->buf[xmit->tail], &channel->data); |
1da177e4 LT |
499 | ZSDELAY(); |
500 | ZS_WSYNC(channel); | |
501 | ||
502 | xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); | |
503 | up->port.icount.tx++; | |
504 | ||
505 | if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) | |
506 | uart_write_wakeup(&up->port); | |
507 | ||
508 | return; | |
509 | ||
510 | ack_tx_int: | |
36764631 | 511 | writeb(RES_Tx_P, &channel->control); |
1da177e4 LT |
512 | ZSDELAY(); |
513 | ZS_WSYNC(channel); | |
514 | } | |
515 | ||
7d12e780 | 516 | static irqreturn_t sunzilog_interrupt(int irq, void *dev_id) |
1da177e4 LT |
517 | { |
518 | struct uart_sunzilog_port *up = dev_id; | |
519 | ||
520 | while (up) { | |
521 | struct zilog_channel __iomem *channel | |
522 | = ZILOG_CHANNEL_FROM_PORT(&up->port); | |
523 | struct tty_struct *tty; | |
524 | unsigned char r3; | |
525 | ||
526 | spin_lock(&up->port.lock); | |
527 | r3 = read_zsreg(channel, R3); | |
528 | ||
529 | /* Channel A */ | |
530 | tty = NULL; | |
531 | if (r3 & (CHAEXT | CHATxIP | CHARxIP)) { | |
36764631 | 532 | writeb(RES_H_IUS, &channel->control); |
1da177e4 LT |
533 | ZSDELAY(); |
534 | ZS_WSYNC(channel); | |
535 | ||
536 | if (r3 & CHARxIP) | |
7d12e780 | 537 | tty = sunzilog_receive_chars(up, channel); |
1da177e4 | 538 | if (r3 & CHAEXT) |
7d12e780 | 539 | sunzilog_status_handle(up, channel); |
1da177e4 LT |
540 | if (r3 & CHATxIP) |
541 | sunzilog_transmit_chars(up, channel); | |
542 | } | |
543 | spin_unlock(&up->port.lock); | |
544 | ||
545 | if (tty) | |
546 | tty_flip_buffer_push(tty); | |
547 | ||
548 | /* Channel B */ | |
549 | up = up->next; | |
550 | channel = ZILOG_CHANNEL_FROM_PORT(&up->port); | |
551 | ||
552 | spin_lock(&up->port.lock); | |
553 | tty = NULL; | |
554 | if (r3 & (CHBEXT | CHBTxIP | CHBRxIP)) { | |
36764631 | 555 | writeb(RES_H_IUS, &channel->control); |
1da177e4 LT |
556 | ZSDELAY(); |
557 | ZS_WSYNC(channel); | |
558 | ||
559 | if (r3 & CHBRxIP) | |
7d12e780 | 560 | tty = sunzilog_receive_chars(up, channel); |
1da177e4 | 561 | if (r3 & CHBEXT) |
7d12e780 | 562 | sunzilog_status_handle(up, channel); |
1da177e4 LT |
563 | if (r3 & CHBTxIP) |
564 | sunzilog_transmit_chars(up, channel); | |
565 | } | |
566 | spin_unlock(&up->port.lock); | |
567 | ||
568 | if (tty) | |
569 | tty_flip_buffer_push(tty); | |
570 | ||
571 | up = up->next; | |
572 | } | |
573 | ||
574 | return IRQ_HANDLED; | |
575 | } | |
576 | ||
577 | /* A convenient way to quickly get R0 status. The caller must _not_ hold the | |
578 | * port lock, it is acquired here. | |
579 | */ | |
580 | static __inline__ unsigned char sunzilog_read_channel_status(struct uart_port *port) | |
581 | { | |
582 | struct zilog_channel __iomem *channel; | |
1da177e4 LT |
583 | unsigned char status; |
584 | ||
1da177e4 | 585 | channel = ZILOG_CHANNEL_FROM_PORT(port); |
36764631 | 586 | status = readb(&channel->control); |
1da177e4 LT |
587 | ZSDELAY(); |
588 | ||
1da177e4 LT |
589 | return status; |
590 | } | |
591 | ||
592 | /* The port lock is not held. */ | |
593 | static unsigned int sunzilog_tx_empty(struct uart_port *port) | |
594 | { | |
c5f4644e | 595 | unsigned long flags; |
1da177e4 LT |
596 | unsigned char status; |
597 | unsigned int ret; | |
598 | ||
c5f4644e RK |
599 | spin_lock_irqsave(&port->lock, flags); |
600 | ||
1da177e4 | 601 | status = sunzilog_read_channel_status(port); |
c5f4644e RK |
602 | |
603 | spin_unlock_irqrestore(&port->lock, flags); | |
604 | ||
1da177e4 LT |
605 | if (status & Tx_BUF_EMP) |
606 | ret = TIOCSER_TEMT; | |
607 | else | |
608 | ret = 0; | |
609 | ||
610 | return ret; | |
611 | } | |
612 | ||
c5f4644e | 613 | /* The port lock is held and interrupts are disabled. */ |
1da177e4 LT |
614 | static unsigned int sunzilog_get_mctrl(struct uart_port *port) |
615 | { | |
616 | unsigned char status; | |
617 | unsigned int ret; | |
618 | ||
619 | status = sunzilog_read_channel_status(port); | |
620 | ||
621 | ret = 0; | |
622 | if (status & DCD) | |
623 | ret |= TIOCM_CAR; | |
624 | if (status & SYNC) | |
625 | ret |= TIOCM_DSR; | |
626 | if (status & CTS) | |
627 | ret |= TIOCM_CTS; | |
628 | ||
629 | return ret; | |
630 | } | |
631 | ||
632 | /* The port lock is held and interrupts are disabled. */ | |
633 | static void sunzilog_set_mctrl(struct uart_port *port, unsigned int mctrl) | |
634 | { | |
635 | struct uart_sunzilog_port *up = (struct uart_sunzilog_port *) port; | |
636 | struct zilog_channel __iomem *channel = ZILOG_CHANNEL_FROM_PORT(port); | |
637 | unsigned char set_bits, clear_bits; | |
638 | ||
639 | set_bits = clear_bits = 0; | |
640 | ||
641 | if (mctrl & TIOCM_RTS) | |
642 | set_bits |= RTS; | |
643 | else | |
644 | clear_bits |= RTS; | |
645 | if (mctrl & TIOCM_DTR) | |
646 | set_bits |= DTR; | |
647 | else | |
648 | clear_bits |= DTR; | |
649 | ||
650 | /* NOTE: Not subject to 'transmitter active' rule. */ | |
651 | up->curregs[R5] |= set_bits; | |
652 | up->curregs[R5] &= ~clear_bits; | |
653 | write_zsreg(channel, R5, up->curregs[R5]); | |
654 | } | |
655 | ||
656 | /* The port lock is held and interrupts are disabled. */ | |
b129a8cc | 657 | static void sunzilog_stop_tx(struct uart_port *port) |
1da177e4 LT |
658 | { |
659 | struct uart_sunzilog_port *up = (struct uart_sunzilog_port *) port; | |
660 | ||
661 | up->flags |= SUNZILOG_FLAG_TX_STOPPED; | |
662 | } | |
663 | ||
664 | /* The port lock is held and interrupts are disabled. */ | |
b129a8cc | 665 | static void sunzilog_start_tx(struct uart_port *port) |
1da177e4 LT |
666 | { |
667 | struct uart_sunzilog_port *up = (struct uart_sunzilog_port *) port; | |
668 | struct zilog_channel __iomem *channel = ZILOG_CHANNEL_FROM_PORT(port); | |
669 | unsigned char status; | |
670 | ||
671 | up->flags |= SUNZILOG_FLAG_TX_ACTIVE; | |
672 | up->flags &= ~SUNZILOG_FLAG_TX_STOPPED; | |
673 | ||
36764631 | 674 | status = readb(&channel->control); |
1da177e4 LT |
675 | ZSDELAY(); |
676 | ||
677 | /* TX busy? Just wait for the TX done interrupt. */ | |
678 | if (!(status & Tx_BUF_EMP)) | |
679 | return; | |
680 | ||
681 | /* Send the first character to jump-start the TX done | |
682 | * IRQ sending engine. | |
683 | */ | |
684 | if (port->x_char) { | |
36764631 | 685 | writeb(port->x_char, &channel->data); |
1da177e4 LT |
686 | ZSDELAY(); |
687 | ZS_WSYNC(channel); | |
688 | ||
689 | port->icount.tx++; | |
690 | port->x_char = 0; | |
691 | } else { | |
692 | struct circ_buf *xmit = &port->info->xmit; | |
693 | ||
36764631 | 694 | writeb(xmit->buf[xmit->tail], &channel->data); |
1da177e4 LT |
695 | ZSDELAY(); |
696 | ZS_WSYNC(channel); | |
697 | ||
698 | xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); | |
699 | port->icount.tx++; | |
700 | ||
701 | if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) | |
702 | uart_write_wakeup(&up->port); | |
703 | } | |
704 | } | |
705 | ||
706 | /* The port lock is held. */ | |
707 | static void sunzilog_stop_rx(struct uart_port *port) | |
708 | { | |
709 | struct uart_sunzilog_port *up = UART_ZILOG(port); | |
710 | struct zilog_channel __iomem *channel; | |
711 | ||
712 | if (ZS_IS_CONS(up)) | |
713 | return; | |
714 | ||
715 | channel = ZILOG_CHANNEL_FROM_PORT(port); | |
716 | ||
717 | /* Disable all RX interrupts. */ | |
718 | up->curregs[R1] &= ~RxINT_MASK; | |
719 | sunzilog_maybe_update_regs(up, channel); | |
720 | } | |
721 | ||
722 | /* The port lock is held. */ | |
723 | static void sunzilog_enable_ms(struct uart_port *port) | |
724 | { | |
725 | struct uart_sunzilog_port *up = (struct uart_sunzilog_port *) port; | |
726 | struct zilog_channel __iomem *channel = ZILOG_CHANNEL_FROM_PORT(port); | |
727 | unsigned char new_reg; | |
728 | ||
729 | new_reg = up->curregs[R15] | (DCDIE | SYNCIE | CTSIE); | |
730 | if (new_reg != up->curregs[R15]) { | |
731 | up->curregs[R15] = new_reg; | |
732 | ||
733 | /* NOTE: Not subject to 'transmitter active' rule. */ | |
734 | write_zsreg(channel, R15, up->curregs[R15]); | |
735 | } | |
736 | } | |
737 | ||
738 | /* The port lock is not held. */ | |
739 | static void sunzilog_break_ctl(struct uart_port *port, int break_state) | |
740 | { | |
741 | struct uart_sunzilog_port *up = (struct uart_sunzilog_port *) port; | |
742 | struct zilog_channel __iomem *channel = ZILOG_CHANNEL_FROM_PORT(port); | |
743 | unsigned char set_bits, clear_bits, new_reg; | |
744 | unsigned long flags; | |
745 | ||
746 | set_bits = clear_bits = 0; | |
747 | ||
748 | if (break_state) | |
749 | set_bits |= SND_BRK; | |
750 | else | |
751 | clear_bits |= SND_BRK; | |
752 | ||
753 | spin_lock_irqsave(&port->lock, flags); | |
754 | ||
755 | new_reg = (up->curregs[R5] | set_bits) & ~clear_bits; | |
756 | if (new_reg != up->curregs[R5]) { | |
757 | up->curregs[R5] = new_reg; | |
758 | ||
759 | /* NOTE: Not subject to 'transmitter active' rule. */ | |
760 | write_zsreg(channel, R5, up->curregs[R5]); | |
761 | } | |
762 | ||
763 | spin_unlock_irqrestore(&port->lock, flags); | |
764 | } | |
765 | ||
766 | static void __sunzilog_startup(struct uart_sunzilog_port *up) | |
767 | { | |
768 | struct zilog_channel __iomem *channel; | |
769 | ||
770 | channel = ZILOG_CHANNEL_FROM_PORT(&up->port); | |
36764631 | 771 | up->prev_status = readb(&channel->control); |
1da177e4 LT |
772 | |
773 | /* Enable receiver and transmitter. */ | |
774 | up->curregs[R3] |= RxENAB; | |
775 | up->curregs[R5] |= TxENAB; | |
776 | ||
777 | up->curregs[R1] |= EXT_INT_ENAB | INT_ALL_Rx | TxINT_ENAB; | |
778 | sunzilog_maybe_update_regs(up, channel); | |
779 | } | |
780 | ||
781 | static int sunzilog_startup(struct uart_port *port) | |
782 | { | |
783 | struct uart_sunzilog_port *up = UART_ZILOG(port); | |
784 | unsigned long flags; | |
785 | ||
786 | if (ZS_IS_CONS(up)) | |
787 | return 0; | |
788 | ||
789 | spin_lock_irqsave(&port->lock, flags); | |
790 | __sunzilog_startup(up); | |
791 | spin_unlock_irqrestore(&port->lock, flags); | |
792 | return 0; | |
793 | } | |
794 | ||
795 | /* | |
796 | * The test for ZS_IS_CONS is explained by the following e-mail: | |
797 | ***** | |
798 | * From: Russell King <rmk@arm.linux.org.uk> | |
799 | * Date: Sun, 8 Dec 2002 10:18:38 +0000 | |
800 | * | |
801 | * On Sun, Dec 08, 2002 at 02:43:36AM -0500, Pete Zaitcev wrote: | |
802 | * > I boot my 2.5 boxes using "console=ttyS0,9600" argument, | |
803 | * > and I noticed that something is not right with reference | |
804 | * > counting in this case. It seems that when the console | |
805 | * > is open by kernel initially, this is not accounted | |
806 | * > as an open, and uart_startup is not called. | |
807 | * | |
808 | * That is correct. We are unable to call uart_startup when the serial | |
809 | * console is initialised because it may need to allocate memory (as | |
810 | * request_irq does) and the memory allocators may not have been | |
811 | * initialised. | |
812 | * | |
813 | * 1. initialise the port into a state where it can send characters in the | |
814 | * console write method. | |
815 | * | |
816 | * 2. don't do the actual hardware shutdown in your shutdown() method (but | |
817 | * do the normal software shutdown - ie, free irqs etc) | |
818 | ***** | |
819 | */ | |
820 | static void sunzilog_shutdown(struct uart_port *port) | |
821 | { | |
822 | struct uart_sunzilog_port *up = UART_ZILOG(port); | |
823 | struct zilog_channel __iomem *channel; | |
824 | unsigned long flags; | |
825 | ||
826 | if (ZS_IS_CONS(up)) | |
827 | return; | |
828 | ||
829 | spin_lock_irqsave(&port->lock, flags); | |
830 | ||
831 | channel = ZILOG_CHANNEL_FROM_PORT(port); | |
832 | ||
833 | /* Disable receiver and transmitter. */ | |
834 | up->curregs[R3] &= ~RxENAB; | |
835 | up->curregs[R5] &= ~TxENAB; | |
836 | ||
837 | /* Disable all interrupts and BRK assertion. */ | |
838 | up->curregs[R1] &= ~(EXT_INT_ENAB | TxINT_ENAB | RxINT_MASK); | |
839 | up->curregs[R5] &= ~SND_BRK; | |
840 | sunzilog_maybe_update_regs(up, channel); | |
841 | ||
842 | spin_unlock_irqrestore(&port->lock, flags); | |
843 | } | |
844 | ||
845 | /* Shared by TTY driver and serial console setup. The port lock is held | |
846 | * and local interrupts are disabled. | |
847 | */ | |
848 | static void | |
849 | sunzilog_convert_to_zs(struct uart_sunzilog_port *up, unsigned int cflag, | |
850 | unsigned int iflag, int brg) | |
851 | { | |
852 | ||
853 | up->curregs[R10] = NRZ; | |
854 | up->curregs[R11] = TCBR | RCBR; | |
855 | ||
856 | /* Program BAUD and clock source. */ | |
857 | up->curregs[R4] &= ~XCLK_MASK; | |
858 | up->curregs[R4] |= X16CLK; | |
859 | up->curregs[R12] = brg & 0xff; | |
860 | up->curregs[R13] = (brg >> 8) & 0xff; | |
861 | up->curregs[R14] = BRSRC | BRENAB; | |
862 | ||
863 | /* Character size, stop bits, and parity. */ | |
864 | up->curregs[3] &= ~RxN_MASK; | |
865 | up->curregs[5] &= ~TxN_MASK; | |
866 | switch (cflag & CSIZE) { | |
867 | case CS5: | |
868 | up->curregs[3] |= Rx5; | |
869 | up->curregs[5] |= Tx5; | |
870 | up->parity_mask = 0x1f; | |
871 | break; | |
872 | case CS6: | |
873 | up->curregs[3] |= Rx6; | |
874 | up->curregs[5] |= Tx6; | |
875 | up->parity_mask = 0x3f; | |
876 | break; | |
877 | case CS7: | |
878 | up->curregs[3] |= Rx7; | |
879 | up->curregs[5] |= Tx7; | |
880 | up->parity_mask = 0x7f; | |
881 | break; | |
882 | case CS8: | |
883 | default: | |
884 | up->curregs[3] |= Rx8; | |
885 | up->curregs[5] |= Tx8; | |
886 | up->parity_mask = 0xff; | |
887 | break; | |
888 | }; | |
889 | up->curregs[4] &= ~0x0c; | |
890 | if (cflag & CSTOPB) | |
891 | up->curregs[4] |= SB2; | |
892 | else | |
893 | up->curregs[4] |= SB1; | |
894 | if (cflag & PARENB) | |
895 | up->curregs[4] |= PAR_ENAB; | |
896 | else | |
897 | up->curregs[4] &= ~PAR_ENAB; | |
898 | if (!(cflag & PARODD)) | |
899 | up->curregs[4] |= PAR_EVEN; | |
900 | else | |
901 | up->curregs[4] &= ~PAR_EVEN; | |
902 | ||
903 | up->port.read_status_mask = Rx_OVR; | |
904 | if (iflag & INPCK) | |
905 | up->port.read_status_mask |= CRC_ERR | PAR_ERR; | |
906 | if (iflag & (BRKINT | PARMRK)) | |
907 | up->port.read_status_mask |= BRK_ABRT; | |
908 | ||
909 | up->port.ignore_status_mask = 0; | |
910 | if (iflag & IGNPAR) | |
911 | up->port.ignore_status_mask |= CRC_ERR | PAR_ERR; | |
912 | if (iflag & IGNBRK) { | |
913 | up->port.ignore_status_mask |= BRK_ABRT; | |
914 | if (iflag & IGNPAR) | |
915 | up->port.ignore_status_mask |= Rx_OVR; | |
916 | } | |
917 | ||
918 | if ((cflag & CREAD) == 0) | |
919 | up->port.ignore_status_mask = 0xff; | |
920 | } | |
921 | ||
922 | /* The port lock is not held. */ | |
923 | static void | |
606d099c AC |
924 | sunzilog_set_termios(struct uart_port *port, struct ktermios *termios, |
925 | struct ktermios *old) | |
1da177e4 LT |
926 | { |
927 | struct uart_sunzilog_port *up = (struct uart_sunzilog_port *) port; | |
928 | unsigned long flags; | |
929 | int baud, brg; | |
930 | ||
931 | baud = uart_get_baud_rate(port, termios, old, 1200, 76800); | |
932 | ||
933 | spin_lock_irqsave(&up->port.lock, flags); | |
934 | ||
935 | brg = BPS_TO_BRG(baud, ZS_CLOCK / ZS_CLOCK_DIVISOR); | |
936 | ||
937 | sunzilog_convert_to_zs(up, termios->c_cflag, termios->c_iflag, brg); | |
938 | ||
939 | if (UART_ENABLE_MS(&up->port, termios->c_cflag)) | |
940 | up->flags |= SUNZILOG_FLAG_MODEM_STATUS; | |
941 | else | |
942 | up->flags &= ~SUNZILOG_FLAG_MODEM_STATUS; | |
943 | ||
944 | up->cflag = termios->c_cflag; | |
945 | ||
946 | sunzilog_maybe_update_regs(up, ZILOG_CHANNEL_FROM_PORT(port)); | |
947 | ||
948 | uart_update_timeout(port, termios->c_cflag, baud); | |
949 | ||
950 | spin_unlock_irqrestore(&up->port.lock, flags); | |
951 | } | |
952 | ||
953 | static const char *sunzilog_type(struct uart_port *port) | |
954 | { | |
36764631 | 955 | return "zs"; |
1da177e4 LT |
956 | } |
957 | ||
958 | /* We do not request/release mappings of the registers here, this | |
959 | * happens at early serial probe time. | |
960 | */ | |
961 | static void sunzilog_release_port(struct uart_port *port) | |
962 | { | |
963 | } | |
964 | ||
965 | static int sunzilog_request_port(struct uart_port *port) | |
966 | { | |
967 | return 0; | |
968 | } | |
969 | ||
970 | /* These do not need to do anything interesting either. */ | |
971 | static void sunzilog_config_port(struct uart_port *port, int flags) | |
972 | { | |
973 | } | |
974 | ||
975 | /* We do not support letting the user mess with the divisor, IRQ, etc. */ | |
976 | static int sunzilog_verify_port(struct uart_port *port, struct serial_struct *ser) | |
977 | { | |
978 | return -EINVAL; | |
979 | } | |
980 | ||
981 | static struct uart_ops sunzilog_pops = { | |
982 | .tx_empty = sunzilog_tx_empty, | |
983 | .set_mctrl = sunzilog_set_mctrl, | |
984 | .get_mctrl = sunzilog_get_mctrl, | |
985 | .stop_tx = sunzilog_stop_tx, | |
986 | .start_tx = sunzilog_start_tx, | |
987 | .stop_rx = sunzilog_stop_rx, | |
988 | .enable_ms = sunzilog_enable_ms, | |
989 | .break_ctl = sunzilog_break_ctl, | |
990 | .startup = sunzilog_startup, | |
991 | .shutdown = sunzilog_shutdown, | |
992 | .set_termios = sunzilog_set_termios, | |
993 | .type = sunzilog_type, | |
994 | .release_port = sunzilog_release_port, | |
995 | .request_port = sunzilog_request_port, | |
996 | .config_port = sunzilog_config_port, | |
997 | .verify_port = sunzilog_verify_port, | |
998 | }; | |
999 | ||
1000 | static struct uart_sunzilog_port *sunzilog_port_table; | |
1001 | static struct zilog_layout __iomem **sunzilog_chip_regs; | |
1002 | ||
1003 | static struct uart_sunzilog_port *sunzilog_irq_chain; | |
1da177e4 LT |
1004 | |
1005 | static struct uart_driver sunzilog_reg = { | |
1006 | .owner = THIS_MODULE, | |
1007 | .driver_name = "ttyS", | |
1da177e4 LT |
1008 | .dev_name = "ttyS", |
1009 | .major = TTY_MAJOR, | |
1010 | }; | |
1011 | ||
36764631 | 1012 | static int __init sunzilog_alloc_tables(void) |
1da177e4 | 1013 | { |
36764631 DM |
1014 | struct uart_sunzilog_port *up; |
1015 | unsigned long size; | |
1016 | int i; | |
1da177e4 | 1017 | |
36764631 DM |
1018 | size = NUM_CHANNELS * sizeof(struct uart_sunzilog_port); |
1019 | sunzilog_port_table = kzalloc(size, GFP_KERNEL); | |
1020 | if (!sunzilog_port_table) | |
1021 | return -ENOMEM; | |
1da177e4 | 1022 | |
36764631 DM |
1023 | for (i = 0; i < NUM_CHANNELS; i++) { |
1024 | up = &sunzilog_port_table[i]; | |
1da177e4 | 1025 | |
36764631 | 1026 | spin_lock_init(&up->port.lock); |
1da177e4 | 1027 | |
36764631 DM |
1028 | if (i == 0) |
1029 | sunzilog_irq_chain = up; | |
1da177e4 | 1030 | |
36764631 DM |
1031 | if (i < NUM_CHANNELS - 1) |
1032 | up->next = up + 1; | |
1033 | else | |
1034 | up->next = NULL; | |
1da177e4 LT |
1035 | } |
1036 | ||
36764631 DM |
1037 | size = NUM_SUNZILOG * sizeof(struct zilog_layout __iomem *); |
1038 | sunzilog_chip_regs = kzalloc(size, GFP_KERNEL); | |
1039 | if (!sunzilog_chip_regs) { | |
1040 | kfree(sunzilog_port_table); | |
1041 | sunzilog_irq_chain = NULL; | |
1042 | return -ENOMEM; | |
1da177e4 LT |
1043 | } |
1044 | ||
36764631 | 1045 | return 0; |
1da177e4 | 1046 | } |
1da177e4 | 1047 | |
36764631 | 1048 | static void sunzilog_free_tables(void) |
1da177e4 | 1049 | { |
36764631 DM |
1050 | kfree(sunzilog_port_table); |
1051 | sunzilog_irq_chain = NULL; | |
1052 | kfree(sunzilog_chip_regs); | |
1da177e4 LT |
1053 | } |
1054 | ||
1055 | #define ZS_PUT_CHAR_MAX_DELAY 2000 /* 10 ms */ | |
1056 | ||
d358788f | 1057 | static void sunzilog_putchar(struct uart_port *port, int ch) |
1da177e4 | 1058 | { |
48343273 | 1059 | struct zilog_channel __iomem *channel = ZILOG_CHANNEL_FROM_PORT(port); |
1da177e4 LT |
1060 | int loops = ZS_PUT_CHAR_MAX_DELAY; |
1061 | ||
1062 | /* This is a timed polling loop so do not switch the explicit | |
1063 | * udelay with ZSDELAY as that is a NOP on some platforms. -DaveM | |
1064 | */ | |
1065 | do { | |
36764631 | 1066 | unsigned char val = readb(&channel->control); |
1da177e4 LT |
1067 | if (val & Tx_BUF_EMP) { |
1068 | ZSDELAY(); | |
1069 | break; | |
1070 | } | |
1071 | udelay(5); | |
1072 | } while (--loops); | |
1073 | ||
36764631 | 1074 | writeb(ch, &channel->data); |
1da177e4 LT |
1075 | ZSDELAY(); |
1076 | ZS_WSYNC(channel); | |
1077 | } | |
1078 | ||
1079 | #ifdef CONFIG_SERIO | |
1080 | ||
1081 | static DEFINE_SPINLOCK(sunzilog_serio_lock); | |
1082 | ||
1083 | static int sunzilog_serio_write(struct serio *serio, unsigned char ch) | |
1084 | { | |
1085 | struct uart_sunzilog_port *up = serio->port_data; | |
1086 | unsigned long flags; | |
1087 | ||
1088 | spin_lock_irqsave(&sunzilog_serio_lock, flags); | |
1089 | ||
d358788f | 1090 | sunzilog_putchar(&up->port, ch); |
1da177e4 LT |
1091 | |
1092 | spin_unlock_irqrestore(&sunzilog_serio_lock, flags); | |
1093 | ||
1094 | return 0; | |
1095 | } | |
1096 | ||
1097 | static int sunzilog_serio_open(struct serio *serio) | |
1098 | { | |
1099 | struct uart_sunzilog_port *up = serio->port_data; | |
1100 | unsigned long flags; | |
1101 | int ret; | |
1102 | ||
1103 | spin_lock_irqsave(&sunzilog_serio_lock, flags); | |
1104 | if (!up->serio_open) { | |
1105 | up->serio_open = 1; | |
1106 | ret = 0; | |
1107 | } else | |
1108 | ret = -EBUSY; | |
1109 | spin_unlock_irqrestore(&sunzilog_serio_lock, flags); | |
1110 | ||
1111 | return ret; | |
1112 | } | |
1113 | ||
1114 | static void sunzilog_serio_close(struct serio *serio) | |
1115 | { | |
1116 | struct uart_sunzilog_port *up = serio->port_data; | |
1117 | unsigned long flags; | |
1118 | ||
1119 | spin_lock_irqsave(&sunzilog_serio_lock, flags); | |
1120 | up->serio_open = 0; | |
1121 | spin_unlock_irqrestore(&sunzilog_serio_lock, flags); | |
1122 | } | |
1123 | ||
1124 | #endif /* CONFIG_SERIO */ | |
1125 | ||
1126 | #ifdef CONFIG_SERIAL_SUNZILOG_CONSOLE | |
1127 | static void | |
1128 | sunzilog_console_write(struct console *con, const char *s, unsigned int count) | |
1129 | { | |
1130 | struct uart_sunzilog_port *up = &sunzilog_port_table[con->index]; | |
1da177e4 | 1131 | unsigned long flags; |
1da177e4 LT |
1132 | |
1133 | spin_lock_irqsave(&up->port.lock, flags); | |
d358788f | 1134 | uart_console_write(&up->port, s, count, sunzilog_putchar); |
1da177e4 LT |
1135 | udelay(2); |
1136 | spin_unlock_irqrestore(&up->port.lock, flags); | |
1137 | } | |
1138 | ||
1139 | static int __init sunzilog_console_setup(struct console *con, char *options) | |
1140 | { | |
1141 | struct uart_sunzilog_port *up = &sunzilog_port_table[con->index]; | |
1142 | unsigned long flags; | |
1143 | int baud, brg; | |
1144 | ||
b8b99e85 DM |
1145 | if (up->port.type != PORT_SUNZILOG) |
1146 | return -1; | |
1147 | ||
1da177e4 LT |
1148 | printk(KERN_INFO "Console: ttyS%d (SunZilog zs%d)\n", |
1149 | (sunzilog_reg.minor - 64) + con->index, con->index); | |
1150 | ||
1151 | /* Get firmware console settings. */ | |
1152 | sunserial_console_termios(con); | |
1153 | ||
1154 | /* Firmware console speed is limited to 150-->38400 baud so | |
1155 | * this hackish cflag thing is OK. | |
1156 | */ | |
1157 | switch (con->cflag & CBAUD) { | |
1158 | case B150: baud = 150; break; | |
1159 | case B300: baud = 300; break; | |
1160 | case B600: baud = 600; break; | |
1161 | case B1200: baud = 1200; break; | |
1162 | case B2400: baud = 2400; break; | |
1163 | case B4800: baud = 4800; break; | |
1164 | default: case B9600: baud = 9600; break; | |
1165 | case B19200: baud = 19200; break; | |
1166 | case B38400: baud = 38400; break; | |
1167 | }; | |
1168 | ||
1169 | brg = BPS_TO_BRG(baud, ZS_CLOCK / ZS_CLOCK_DIVISOR); | |
1170 | ||
1171 | spin_lock_irqsave(&up->port.lock, flags); | |
1172 | ||
1173 | up->curregs[R15] = BRKIE; | |
1174 | sunzilog_convert_to_zs(up, con->cflag, 0, brg); | |
1175 | ||
1176 | sunzilog_set_mctrl(&up->port, TIOCM_DTR | TIOCM_RTS); | |
1177 | __sunzilog_startup(up); | |
1178 | ||
1179 | spin_unlock_irqrestore(&up->port.lock, flags); | |
1180 | ||
1181 | return 0; | |
1182 | } | |
1183 | ||
eba8cefc | 1184 | static struct console sunzilog_console_ops = { |
1da177e4 LT |
1185 | .name = "ttyS", |
1186 | .write = sunzilog_console_write, | |
1187 | .device = uart_console_device, | |
1188 | .setup = sunzilog_console_setup, | |
1189 | .flags = CON_PRINTBUFFER, | |
1190 | .index = -1, | |
1191 | .data = &sunzilog_reg, | |
1192 | }; | |
1da177e4 | 1193 | |
1ddb7c98 DM |
1194 | static inline struct console *SUNZILOG_CONSOLE(void) |
1195 | { | |
1196 | int i; | |
1197 | ||
1198 | if (con_is_present()) | |
1199 | return NULL; | |
1200 | ||
1201 | for (i = 0; i < NUM_CHANNELS; i++) { | |
1202 | int this_minor = sunzilog_reg.minor + i; | |
1203 | ||
1204 | if ((this_minor - 64) == (serial_console - 1)) | |
1205 | break; | |
1206 | } | |
1207 | if (i == NUM_CHANNELS) | |
1208 | return NULL; | |
1209 | ||
eba8cefc | 1210 | sunzilog_console_ops.index = i; |
1ddb7c98 DM |
1211 | sunzilog_port_table[i].flags |= SUNZILOG_FLAG_IS_CONS; |
1212 | ||
eba8cefc | 1213 | return &sunzilog_console_ops; |
1ddb7c98 DM |
1214 | } |
1215 | ||
1da177e4 | 1216 | #else |
1ddb7c98 | 1217 | #define SUNZILOG_CONSOLE() (NULL) |
1da177e4 LT |
1218 | #endif |
1219 | ||
1da177e4 LT |
1220 | static void __init sunzilog_init_kbdms(struct uart_sunzilog_port *up, int channel) |
1221 | { | |
1222 | int baud, brg; | |
1223 | ||
8a84eb16 | 1224 | if (up->flags & SUNZILOG_FLAG_CONS_KEYB) { |
1da177e4 LT |
1225 | up->cflag = B1200 | CS8 | CLOCAL | CREAD; |
1226 | baud = 1200; | |
1227 | } else { | |
1da177e4 LT |
1228 | up->cflag = B4800 | CS8 | CLOCAL | CREAD; |
1229 | baud = 4800; | |
1230 | } | |
1da177e4 LT |
1231 | |
1232 | up->curregs[R15] = BRKIE; | |
1233 | brg = BPS_TO_BRG(baud, ZS_CLOCK / ZS_CLOCK_DIVISOR); | |
1234 | sunzilog_convert_to_zs(up, up->cflag, 0, brg); | |
1235 | sunzilog_set_mctrl(&up->port, TIOCM_DTR | TIOCM_RTS); | |
1236 | __sunzilog_startup(up); | |
1237 | } | |
1238 | ||
1239 | #ifdef CONFIG_SERIO | |
8a84eb16 | 1240 | static void __init sunzilog_register_serio(struct uart_sunzilog_port *up) |
1da177e4 | 1241 | { |
36764631 | 1242 | struct serio *serio = &up->serio; |
1da177e4 | 1243 | |
36764631 | 1244 | serio->port_data = up; |
1da177e4 | 1245 | |
36764631 | 1246 | serio->id.type = SERIO_RS232; |
8a84eb16 | 1247 | if (up->flags & SUNZILOG_FLAG_CONS_KEYB) { |
36764631 DM |
1248 | serio->id.proto = SERIO_SUNKBD; |
1249 | strlcpy(serio->name, "zskbd", sizeof(serio->name)); | |
1da177e4 | 1250 | } else { |
36764631 DM |
1251 | serio->id.proto = SERIO_SUN; |
1252 | serio->id.extra = 1; | |
1253 | strlcpy(serio->name, "zsms", sizeof(serio->name)); | |
1da177e4 | 1254 | } |
36764631 | 1255 | strlcpy(serio->phys, |
8a84eb16 DM |
1256 | ((up->flags & SUNZILOG_FLAG_CONS_KEYB) ? |
1257 | "zs/serio0" : "zs/serio1"), | |
36764631 DM |
1258 | sizeof(serio->phys)); |
1259 | ||
1260 | serio->write = sunzilog_serio_write; | |
1261 | serio->open = sunzilog_serio_open; | |
1262 | serio->close = sunzilog_serio_close; | |
1263 | serio->dev.parent = up->port.dev; | |
1264 | ||
1265 | serio_register_port(serio); | |
1da177e4 LT |
1266 | } |
1267 | #endif | |
1268 | ||
fbe96f92 | 1269 | static void __devinit sunzilog_init_hw(struct uart_sunzilog_port *up) |
1da177e4 | 1270 | { |
36764631 DM |
1271 | struct zilog_channel __iomem *channel; |
1272 | unsigned long flags; | |
1273 | int baud, brg; | |
1da177e4 | 1274 | |
36764631 | 1275 | channel = ZILOG_CHANNEL_FROM_PORT(&up->port); |
1da177e4 | 1276 | |
36764631 DM |
1277 | spin_lock_irqsave(&up->port.lock, flags); |
1278 | if (ZS_IS_CHANNEL_A(up)) { | |
1279 | write_zsreg(channel, R9, FHWRES); | |
1280 | ZSDELAY_LONG(); | |
1281 | (void) read_zsreg(channel, R0); | |
1282 | } | |
1da177e4 | 1283 | |
8a84eb16 DM |
1284 | if (up->flags & (SUNZILOG_FLAG_CONS_KEYB | |
1285 | SUNZILOG_FLAG_CONS_MOUSE)) { | |
36764631 DM |
1286 | sunzilog_init_kbdms(up, up->port.line); |
1287 | up->curregs[R9] |= (NV | MIE); | |
1288 | write_zsreg(channel, R9, up->curregs[R9]); | |
1289 | } else { | |
1290 | /* Normal serial TTY. */ | |
1291 | up->parity_mask = 0xff; | |
1292 | up->curregs[R1] = EXT_INT_ENAB | INT_ALL_Rx | TxINT_ENAB; | |
1293 | up->curregs[R4] = PAR_EVEN | X16CLK | SB1; | |
1294 | up->curregs[R3] = RxENAB | Rx8; | |
1295 | up->curregs[R5] = TxENAB | Tx8; | |
1296 | up->curregs[R9] = NV | MIE; | |
1297 | up->curregs[R10] = NRZ; | |
1298 | up->curregs[R11] = TCBR | RCBR; | |
1299 | baud = 9600; | |
1300 | brg = BPS_TO_BRG(baud, ZS_CLOCK / ZS_CLOCK_DIVISOR); | |
1301 | up->curregs[R12] = (brg & 0xff); | |
1302 | up->curregs[R13] = (brg >> 8) & 0xff; | |
1303 | up->curregs[R14] = BRSRC | BRENAB; | |
1304 | __load_zsregs(channel, up->curregs); | |
1305 | write_zsreg(channel, R9, up->curregs[R9]); | |
1306 | } | |
1da177e4 | 1307 | |
36764631 | 1308 | spin_unlock_irqrestore(&up->port.lock, flags); |
1da177e4 LT |
1309 | |
1310 | #ifdef CONFIG_SERIO | |
8a84eb16 DM |
1311 | if (up->flags & (SUNZILOG_FLAG_CONS_KEYB | |
1312 | SUNZILOG_FLAG_CONS_MOUSE)) | |
1313 | sunzilog_register_serio(up); | |
1da177e4 | 1314 | #endif |
1da177e4 LT |
1315 | } |
1316 | ||
4fa97dcf DM |
1317 | static int zilog_irq = -1; |
1318 | ||
67e23a1e | 1319 | static int __devinit zs_probe(struct of_device *op, const struct of_device_id *match) |
36764631 | 1320 | { |
8a84eb16 | 1321 | static int inst; |
36764631 DM |
1322 | struct uart_sunzilog_port *up; |
1323 | struct zilog_layout __iomem *rp; | |
8a84eb16 | 1324 | int keyboard_mouse; |
36764631 | 1325 | int err; |
1da177e4 | 1326 | |
8a84eb16 DM |
1327 | keyboard_mouse = 0; |
1328 | if (of_find_property(op->node, "keyboard", NULL)) | |
1329 | keyboard_mouse = 1; | |
1330 | ||
36764631 DM |
1331 | sunzilog_chip_regs[inst] = of_ioremap(&op->resource[0], 0, |
1332 | sizeof(struct zilog_layout), | |
1333 | "zs"); | |
1334 | if (!sunzilog_chip_regs[inst]) | |
1335 | return -ENOMEM; | |
1da177e4 | 1336 | |
36764631 | 1337 | rp = sunzilog_chip_regs[inst]; |
1da177e4 | 1338 | |
b77d35b7 | 1339 | if (zilog_irq == -1) |
36764631 | 1340 | zilog_irq = op->irqs[0]; |
1ddb7c98 | 1341 | |
36764631 DM |
1342 | up = &sunzilog_port_table[inst * 2]; |
1343 | ||
1344 | /* Channel A */ | |
1345 | up[0].port.mapbase = op->resource[0].start + 0x00; | |
1346 | up[0].port.membase = (void __iomem *) &rp->channelA; | |
1347 | up[0].port.iotype = UPIO_MEM; | |
1348 | up[0].port.irq = op->irqs[0]; | |
1349 | up[0].port.uartclk = ZS_CLOCK; | |
1350 | up[0].port.fifosize = 1; | |
1351 | up[0].port.ops = &sunzilog_pops; | |
1352 | up[0].port.type = PORT_SUNZILOG; | |
1353 | up[0].port.flags = 0; | |
1354 | up[0].port.line = (inst * 2) + 0; | |
1355 | up[0].port.dev = &op->dev; | |
1356 | up[0].flags |= SUNZILOG_FLAG_IS_CHANNEL_A; | |
8a84eb16 | 1357 | if (keyboard_mouse) |
36764631 DM |
1358 | up[0].flags |= SUNZILOG_FLAG_CONS_KEYB; |
1359 | sunzilog_init_hw(&up[0]); | |
1360 | ||
1361 | /* Channel B */ | |
1362 | up[1].port.mapbase = op->resource[0].start + 0x04; | |
1363 | up[1].port.membase = (void __iomem *) &rp->channelB; | |
1364 | up[1].port.iotype = UPIO_MEM; | |
1365 | up[1].port.irq = op->irqs[0]; | |
1366 | up[1].port.uartclk = ZS_CLOCK; | |
1367 | up[1].port.fifosize = 1; | |
1368 | up[1].port.ops = &sunzilog_pops; | |
1369 | up[1].port.type = PORT_SUNZILOG; | |
1370 | up[1].port.flags = 0; | |
1371 | up[1].port.line = (inst * 2) + 1; | |
1372 | up[1].port.dev = &op->dev; | |
1373 | up[1].flags |= 0; | |
8a84eb16 | 1374 | if (keyboard_mouse) |
36764631 DM |
1375 | up[1].flags |= SUNZILOG_FLAG_CONS_MOUSE; |
1376 | sunzilog_init_hw(&up[1]); | |
1377 | ||
8a84eb16 | 1378 | if (!keyboard_mouse) { |
36764631 DM |
1379 | err = uart_add_one_port(&sunzilog_reg, &up[0].port); |
1380 | if (err) { | |
e3a411a3 DM |
1381 | of_iounmap(&op->resource[0], |
1382 | rp, sizeof(struct zilog_layout)); | |
36764631 DM |
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); | |
e3a411a3 DM |
1388 | of_iounmap(&op->resource[0], |
1389 | rp, sizeof(struct zilog_layout)); | |
36764631 | 1390 | return err; |
1da177e4 | 1391 | } |
8a84eb16 DM |
1392 | } else { |
1393 | printk(KERN_INFO "%s: Keyboard at MMIO %lx (irq = %d) " | |
1394 | "is a zs\n", | |
1395 | op->dev.bus_id, up[0].port.mapbase, op->irqs[0]); | |
1396 | printk(KERN_INFO "%s: Mouse at MMIO %lx (irq = %d) " | |
1397 | "is a zs\n", | |
1398 | op->dev.bus_id, up[1].port.mapbase, op->irqs[0]); | |
1da177e4 LT |
1399 | } |
1400 | ||
67e23a1e | 1401 | dev_set_drvdata(&op->dev, &up[0]); |
4fa97dcf | 1402 | |
8a84eb16 DM |
1403 | inst++; |
1404 | ||
36764631 | 1405 | return 0; |
1da177e4 LT |
1406 | } |
1407 | ||
4fa97dcf | 1408 | static void __devexit zs_remove_one(struct uart_sunzilog_port *up) |
1da177e4 | 1409 | { |
36764631 DM |
1410 | if (ZS_IS_KEYB(up) || ZS_IS_MOUSE(up)) { |
1411 | #ifdef CONFIG_SERIO | |
1412 | serio_unregister_port(&up->serio); | |
1413 | #endif | |
1414 | } else | |
1415 | uart_remove_one_port(&sunzilog_reg, &up->port); | |
4fa97dcf | 1416 | } |
1da177e4 | 1417 | |
e3a411a3 | 1418 | static int __devexit zs_remove(struct of_device *op) |
4fa97dcf | 1419 | { |
e3a411a3 | 1420 | struct uart_sunzilog_port *up = dev_get_drvdata(&op->dev); |
4fa97dcf DM |
1421 | struct zilog_layout __iomem *regs; |
1422 | ||
1423 | zs_remove_one(&up[0]); | |
1424 | zs_remove_one(&up[1]); | |
1da177e4 | 1425 | |
4fa97dcf | 1426 | regs = sunzilog_chip_regs[up[0].port.line / 2]; |
e3a411a3 | 1427 | of_iounmap(&op->resource[0], regs, sizeof(struct zilog_layout)); |
4fa97dcf | 1428 | |
e3a411a3 | 1429 | dev_set_drvdata(&op->dev, NULL); |
1da177e4 | 1430 | |
36764631 | 1431 | return 0; |
1da177e4 LT |
1432 | } |
1433 | ||
36764631 DM |
1434 | static struct of_device_id zs_match[] = { |
1435 | { | |
1436 | .name = "zs", | |
1437 | }, | |
1438 | {}, | |
1439 | }; | |
1440 | MODULE_DEVICE_TABLE(of, zs_match); | |
1441 | ||
1442 | static struct of_platform_driver zs_driver = { | |
1443 | .name = "zs", | |
1444 | .match_table = zs_match, | |
1445 | .probe = zs_probe, | |
1446 | .remove = __devexit_p(zs_remove), | |
1447 | }; | |
1448 | ||
1da177e4 LT |
1449 | static int __init sunzilog_init(void) |
1450 | { | |
36764631 | 1451 | struct device_node *dp; |
67e23a1e | 1452 | int err, uart_count; |
8a84eb16 | 1453 | int num_keybms; |
1da177e4 | 1454 | |
36764631 | 1455 | NUM_SUNZILOG = 0; |
8a84eb16 DM |
1456 | num_keybms = 0; |
1457 | for_each_node_by_name(dp, "zs") { | |
36764631 | 1458 | NUM_SUNZILOG++; |
8a84eb16 DM |
1459 | if (of_find_property(dp, "keyboard", NULL)) |
1460 | num_keybms++; | |
1461 | } | |
1da177e4 | 1462 | |
67e23a1e | 1463 | uart_count = 0; |
36764631 DM |
1464 | if (NUM_SUNZILOG) { |
1465 | int uart_count; | |
1da177e4 | 1466 | |
36764631 DM |
1467 | err = sunzilog_alloc_tables(); |
1468 | if (err) | |
67e23a1e | 1469 | goto out; |
1da177e4 | 1470 | |
8a84eb16 | 1471 | uart_count = (NUM_SUNZILOG * 2) - (2 * num_keybms); |
36764631 DM |
1472 | |
1473 | sunzilog_reg.nr = uart_count; | |
1474 | sunzilog_reg.minor = sunserial_current_minor; | |
1475 | err = uart_register_driver(&sunzilog_reg); | |
67e23a1e DM |
1476 | if (err) |
1477 | goto out_free_tables; | |
1478 | ||
36764631 DM |
1479 | sunzilog_reg.tty_driver->name_base = sunzilog_reg.minor - 64; |
1480 | sunzilog_reg.cons = SUNZILOG_CONSOLE(); | |
1481 | ||
1482 | sunserial_current_minor += uart_count; | |
1483 | } | |
1484 | ||
67e23a1e DM |
1485 | err = of_register_driver(&zs_driver, &of_bus_type); |
1486 | if (err) | |
1487 | goto out_unregister_uart; | |
1488 | ||
1489 | if (zilog_irq != -1) { | |
1490 | err = request_irq(zilog_irq, sunzilog_interrupt, IRQF_SHARED, | |
1491 | "zs", sunzilog_irq_chain); | |
1492 | if (err) | |
1493 | goto out_unregister_driver; | |
1494 | } | |
1495 | ||
1496 | out: | |
1497 | return err; | |
1498 | ||
1499 | out_unregister_driver: | |
1500 | of_unregister_driver(&zs_driver); | |
1501 | ||
1502 | out_unregister_uart: | |
1503 | if (NUM_SUNZILOG) { | |
1504 | uart_unregister_driver(&sunzilog_reg); | |
1505 | sunzilog_reg.cons = NULL; | |
1506 | } | |
1507 | ||
1508 | out_free_tables: | |
1509 | sunzilog_free_tables(); | |
1510 | goto out; | |
1da177e4 LT |
1511 | } |
1512 | ||
1513 | static void __exit sunzilog_exit(void) | |
1514 | { | |
36764631 | 1515 | of_unregister_driver(&zs_driver); |
1da177e4 | 1516 | |
4fa97dcf DM |
1517 | if (zilog_irq != -1) { |
1518 | free_irq(zilog_irq, sunzilog_irq_chain); | |
1519 | zilog_irq = -1; | |
1520 | } | |
1521 | ||
36764631 DM |
1522 | if (NUM_SUNZILOG) { |
1523 | uart_unregister_driver(&sunzilog_reg); | |
1524 | sunzilog_free_tables(); | |
1da177e4 | 1525 | } |
1da177e4 LT |
1526 | } |
1527 | ||
1528 | module_init(sunzilog_init); | |
1529 | module_exit(sunzilog_exit); | |
1530 | ||
1531 | MODULE_AUTHOR("David S. Miller"); | |
1532 | MODULE_DESCRIPTION("Sun Zilog serial port driver"); | |
9efc3715 | 1533 | MODULE_VERSION("2.0"); |
1da177e4 | 1534 | MODULE_LICENSE("GPL"); |