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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Driver for Zilog serial chips found on SGI workstations and | |
3 | * servers. This driver could actually be made more generic. | |
4 | * | |
5 | * This is based on the drivers/serial/sunzilog.c code as of 2.6.0-test7 and the | |
6 | * old drivers/sgi/char/sgiserial.c code which itself is based of the original | |
7 | * drivers/sbus/char/zs.c code. A lot of code has been simply moved over | |
8 | * directly from there but much has been rewritten. Credits therefore go out | |
9 | * to David S. Miller, Eddie C. Dost, Pete Zaitcev, Ted Ts'o and Alex Buell | |
10 | * for their work there. | |
11 | * | |
12 | * Copyright (C) 2002 Ralf Baechle (ralf@linux-mips.org) | |
13 | * Copyright (C) 2002 David S. Miller (davem@redhat.com) | |
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 | #include <linux/init.h> | |
32 | ||
33 | #include <asm/io.h> | |
34 | #include <asm/irq.h> | |
35 | #include <asm/sgialib.h> | |
36 | #include <asm/sgi/ioc.h> | |
37 | #include <asm/sgi/hpc3.h> | |
38 | #include <asm/sgi/ip22.h> | |
39 | ||
40 | #if defined(CONFIG_SERIAL_IP22_ZILOG_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ) | |
41 | #define SUPPORT_SYSRQ | |
42 | #endif | |
43 | ||
44 | #include <linux/serial_core.h> | |
45 | ||
46 | #include "ip22zilog.h" | |
47 | ||
48 | void ip22_do_break(void); | |
49 | ||
50 | /* | |
51 | * On IP22 we need to delay after register accesses but we do not need to | |
52 | * flush writes. | |
53 | */ | |
54 | #define ZSDELAY() udelay(5) | |
55 | #define ZSDELAY_LONG() udelay(20) | |
56 | #define ZS_WSYNC(channel) do { } while (0) | |
57 | ||
58 | #define NUM_IP22ZILOG 1 | |
59 | #define NUM_CHANNELS (NUM_IP22ZILOG * 2) | |
60 | ||
61 | #define ZS_CLOCK 3672000 /* Zilog input clock rate. */ | |
62 | #define ZS_CLOCK_DIVISOR 16 /* Divisor this driver uses. */ | |
63 | ||
64 | /* | |
65 | * We wrap our port structure around the generic uart_port. | |
66 | */ | |
67 | struct uart_ip22zilog_port { | |
68 | struct uart_port port; | |
69 | ||
70 | /* IRQ servicing chain. */ | |
71 | struct uart_ip22zilog_port *next; | |
72 | ||
73 | /* Current values of Zilog write registers. */ | |
74 | unsigned char curregs[NUM_ZSREGS]; | |
75 | ||
76 | unsigned int flags; | |
77 | #define IP22ZILOG_FLAG_IS_CONS 0x00000004 | |
78 | #define IP22ZILOG_FLAG_IS_KGDB 0x00000008 | |
79 | #define IP22ZILOG_FLAG_MODEM_STATUS 0x00000010 | |
80 | #define IP22ZILOG_FLAG_IS_CHANNEL_A 0x00000020 | |
81 | #define IP22ZILOG_FLAG_REGS_HELD 0x00000040 | |
82 | #define IP22ZILOG_FLAG_TX_STOPPED 0x00000080 | |
83 | #define IP22ZILOG_FLAG_TX_ACTIVE 0x00000100 | |
84 | ||
85 | unsigned int cflag; | |
86 | ||
87 | /* L1-A keyboard break state. */ | |
88 | int kbd_id; | |
89 | int l1_down; | |
90 | ||
91 | unsigned char parity_mask; | |
92 | unsigned char prev_status; | |
93 | }; | |
94 | ||
95 | #define ZILOG_CHANNEL_FROM_PORT(PORT) ((struct zilog_channel *)((PORT)->membase)) | |
96 | #define UART_ZILOG(PORT) ((struct uart_ip22zilog_port *)(PORT)) | |
97 | #define IP22ZILOG_GET_CURR_REG(PORT, REGNUM) \ | |
98 | (UART_ZILOG(PORT)->curregs[REGNUM]) | |
99 | #define IP22ZILOG_SET_CURR_REG(PORT, REGNUM, REGVAL) \ | |
100 | ((UART_ZILOG(PORT)->curregs[REGNUM]) = (REGVAL)) | |
101 | #define ZS_IS_CONS(UP) ((UP)->flags & IP22ZILOG_FLAG_IS_CONS) | |
102 | #define ZS_IS_KGDB(UP) ((UP)->flags & IP22ZILOG_FLAG_IS_KGDB) | |
103 | #define ZS_WANTS_MODEM_STATUS(UP) ((UP)->flags & IP22ZILOG_FLAG_MODEM_STATUS) | |
104 | #define ZS_IS_CHANNEL_A(UP) ((UP)->flags & IP22ZILOG_FLAG_IS_CHANNEL_A) | |
105 | #define ZS_REGS_HELD(UP) ((UP)->flags & IP22ZILOG_FLAG_REGS_HELD) | |
106 | #define ZS_TX_STOPPED(UP) ((UP)->flags & IP22ZILOG_FLAG_TX_STOPPED) | |
107 | #define ZS_TX_ACTIVE(UP) ((UP)->flags & IP22ZILOG_FLAG_TX_ACTIVE) | |
108 | ||
109 | /* Reading and writing Zilog8530 registers. The delays are to make this | |
110 | * driver work on the IP22 which needs a settling delay after each chip | |
111 | * register access, other machines handle this in hardware via auxiliary | |
112 | * flip-flops which implement the settle time we do in software. | |
113 | * | |
114 | * The port lock must be held and local IRQs must be disabled | |
115 | * when {read,write}_zsreg is invoked. | |
116 | */ | |
117 | static unsigned char read_zsreg(struct zilog_channel *channel, | |
118 | unsigned char reg) | |
119 | { | |
120 | unsigned char retval; | |
121 | ||
122 | writeb(reg, &channel->control); | |
123 | ZSDELAY(); | |
124 | retval = readb(&channel->control); | |
125 | ZSDELAY(); | |
126 | ||
127 | return retval; | |
128 | } | |
129 | ||
130 | static void write_zsreg(struct zilog_channel *channel, | |
131 | unsigned char reg, unsigned char value) | |
132 | { | |
133 | writeb(reg, &channel->control); | |
134 | ZSDELAY(); | |
135 | writeb(value, &channel->control); | |
136 | ZSDELAY(); | |
137 | } | |
138 | ||
139 | static void ip22zilog_clear_fifo(struct zilog_channel *channel) | |
140 | { | |
141 | int i; | |
142 | ||
143 | for (i = 0; i < 32; i++) { | |
144 | unsigned char regval; | |
145 | ||
146 | regval = readb(&channel->control); | |
147 | ZSDELAY(); | |
148 | if (regval & Rx_CH_AV) | |
149 | break; | |
150 | ||
151 | regval = read_zsreg(channel, R1); | |
152 | readb(&channel->data); | |
153 | ZSDELAY(); | |
154 | ||
155 | if (regval & (PAR_ERR | Rx_OVR | CRC_ERR)) { | |
156 | writeb(ERR_RES, &channel->control); | |
157 | ZSDELAY(); | |
158 | ZS_WSYNC(channel); | |
159 | } | |
160 | } | |
161 | } | |
162 | ||
163 | /* This function must only be called when the TX is not busy. The UART | |
164 | * port lock must be held and local interrupts disabled. | |
165 | */ | |
166 | static void __load_zsregs(struct zilog_channel *channel, unsigned char *regs) | |
167 | { | |
168 | int i; | |
169 | ||
170 | /* Let pending transmits finish. */ | |
171 | for (i = 0; i < 1000; i++) { | |
172 | unsigned char stat = read_zsreg(channel, R1); | |
173 | if (stat & ALL_SNT) | |
174 | break; | |
175 | udelay(100); | |
176 | } | |
177 | ||
178 | writeb(ERR_RES, &channel->control); | |
179 | ZSDELAY(); | |
180 | ZS_WSYNC(channel); | |
181 | ||
182 | ip22zilog_clear_fifo(channel); | |
183 | ||
184 | /* Disable all interrupts. */ | |
185 | write_zsreg(channel, R1, | |
186 | regs[R1] & ~(RxINT_MASK | TxINT_ENAB | EXT_INT_ENAB)); | |
187 | ||
188 | /* Set parity, sync config, stop bits, and clock divisor. */ | |
189 | write_zsreg(channel, R4, regs[R4]); | |
190 | ||
191 | /* Set misc. TX/RX control bits. */ | |
192 | write_zsreg(channel, R10, regs[R10]); | |
193 | ||
194 | /* Set TX/RX controls sans the enable bits. */ | |
195 | write_zsreg(channel, R3, regs[R3] & ~RxENAB); | |
196 | write_zsreg(channel, R5, regs[R5] & ~TxENAB); | |
197 | ||
198 | /* Synchronous mode config. */ | |
199 | write_zsreg(channel, R6, regs[R6]); | |
200 | write_zsreg(channel, R7, regs[R7]); | |
201 | ||
202 | /* Don't mess with the interrupt vector (R2, unused by us) and | |
203 | * master interrupt control (R9). We make sure this is setup | |
204 | * properly at probe time then never touch it again. | |
205 | */ | |
206 | ||
207 | /* Disable baud generator. */ | |
208 | write_zsreg(channel, R14, regs[R14] & ~BRENAB); | |
209 | ||
210 | /* Clock mode control. */ | |
211 | write_zsreg(channel, R11, regs[R11]); | |
212 | ||
213 | /* Lower and upper byte of baud rate generator divisor. */ | |
214 | write_zsreg(channel, R12, regs[R12]); | |
215 | write_zsreg(channel, R13, regs[R13]); | |
7369a8b3 | 216 | |
1da177e4 LT |
217 | /* Now rewrite R14, with BRENAB (if set). */ |
218 | write_zsreg(channel, R14, regs[R14]); | |
219 | ||
220 | /* External status interrupt control. */ | |
221 | write_zsreg(channel, R15, regs[R15]); | |
222 | ||
223 | /* Reset external status interrupts. */ | |
224 | write_zsreg(channel, R0, RES_EXT_INT); | |
225 | write_zsreg(channel, R0, RES_EXT_INT); | |
226 | ||
227 | /* Rewrite R3/R5, this time without enables masked. */ | |
228 | write_zsreg(channel, R3, regs[R3]); | |
229 | write_zsreg(channel, R5, regs[R5]); | |
230 | ||
231 | /* Rewrite R1, this time without IRQ enabled masked. */ | |
232 | write_zsreg(channel, R1, regs[R1]); | |
233 | } | |
234 | ||
235 | /* Reprogram the Zilog channel HW registers with the copies found in the | |
236 | * software state struct. If the transmitter is busy, we defer this update | |
237 | * until the next TX complete interrupt. Else, we do it right now. | |
238 | * | |
239 | * The UART port lock must be held and local interrupts disabled. | |
240 | */ | |
241 | static void ip22zilog_maybe_update_regs(struct uart_ip22zilog_port *up, | |
242 | struct zilog_channel *channel) | |
243 | { | |
244 | if (!ZS_REGS_HELD(up)) { | |
245 | if (ZS_TX_ACTIVE(up)) { | |
246 | up->flags |= IP22ZILOG_FLAG_REGS_HELD; | |
247 | } else { | |
248 | __load_zsregs(channel, up->curregs); | |
249 | } | |
250 | } | |
251 | } | |
252 | ||
253 | static void ip22zilog_receive_chars(struct uart_ip22zilog_port *up, | |
7d12e780 | 254 | struct zilog_channel *channel) |
1da177e4 LT |
255 | { |
256 | struct tty_struct *tty = up->port.info->tty; /* XXX info==NULL? */ | |
257 | ||
258 | while (1) { | |
33f0f88f | 259 | unsigned char ch, r1, flag; |
1da177e4 LT |
260 | |
261 | r1 = read_zsreg(channel, R1); | |
262 | if (r1 & (PAR_ERR | Rx_OVR | CRC_ERR)) { | |
263 | writeb(ERR_RES, &channel->control); | |
264 | ZSDELAY(); | |
265 | ZS_WSYNC(channel); | |
266 | } | |
267 | ||
268 | ch = readb(&channel->control); | |
269 | ZSDELAY(); | |
270 | ||
271 | /* This funny hack depends upon BRK_ABRT not interfering | |
272 | * with the other bits we care about in R1. | |
273 | */ | |
274 | if (ch & BRK_ABRT) | |
275 | r1 |= BRK_ABRT; | |
276 | ||
277 | ch = readb(&channel->data); | |
278 | ZSDELAY(); | |
279 | ||
280 | ch &= up->parity_mask; | |
281 | ||
282 | if (ZS_IS_CONS(up) && (r1 & BRK_ABRT)) { | |
283 | /* Wait for BREAK to deassert to avoid potentially | |
284 | * confusing the PROM. | |
285 | */ | |
286 | while (1) { | |
287 | ch = readb(&channel->control); | |
288 | ZSDELAY(); | |
289 | if (!(ch & BRK_ABRT)) | |
290 | break; | |
291 | } | |
292 | ip22_do_break(); | |
293 | return; | |
294 | } | |
295 | ||
296 | /* A real serial line, record the character and status. */ | |
33f0f88f | 297 | flag = TTY_NORMAL; |
1da177e4 LT |
298 | up->port.icount.rx++; |
299 | if (r1 & (BRK_ABRT | PAR_ERR | Rx_OVR | CRC_ERR)) { | |
300 | if (r1 & BRK_ABRT) { | |
301 | r1 &= ~(PAR_ERR | CRC_ERR); | |
302 | up->port.icount.brk++; | |
303 | if (uart_handle_break(&up->port)) | |
304 | goto next_char; | |
305 | } | |
306 | else if (r1 & PAR_ERR) | |
307 | up->port.icount.parity++; | |
308 | else if (r1 & CRC_ERR) | |
309 | up->port.icount.frame++; | |
310 | if (r1 & Rx_OVR) | |
311 | up->port.icount.overrun++; | |
312 | r1 &= up->port.read_status_mask; | |
313 | if (r1 & BRK_ABRT) | |
33f0f88f | 314 | flag = TTY_BREAK; |
1da177e4 | 315 | else if (r1 & PAR_ERR) |
33f0f88f | 316 | flag = TTY_PARITY; |
1da177e4 | 317 | else if (r1 & CRC_ERR) |
33f0f88f | 318 | flag = TTY_FRAME; |
1da177e4 | 319 | } |
7d12e780 | 320 | if (uart_handle_sysrq_char(&up->port, ch)) |
1da177e4 LT |
321 | goto next_char; |
322 | ||
323 | if (up->port.ignore_status_mask == 0xff || | |
33f0f88f AC |
324 | (r1 & up->port.ignore_status_mask) == 0) |
325 | tty_insert_flip_char(tty, ch, flag); | |
326 | ||
327 | if (r1 & Rx_OVR) | |
328 | tty_insert_flip_char(tty, 0, TTY_OVERRUN); | |
1da177e4 LT |
329 | next_char: |
330 | ch = readb(&channel->control); | |
331 | ZSDELAY(); | |
332 | if (!(ch & Rx_CH_AV)) | |
333 | break; | |
334 | } | |
335 | ||
336 | tty_flip_buffer_push(tty); | |
337 | } | |
338 | ||
339 | static void ip22zilog_status_handle(struct uart_ip22zilog_port *up, | |
7d12e780 | 340 | struct zilog_channel *channel) |
1da177e4 LT |
341 | { |
342 | unsigned char status; | |
343 | ||
344 | status = readb(&channel->control); | |
345 | ZSDELAY(); | |
346 | ||
347 | writeb(RES_EXT_INT, &channel->control); | |
348 | ZSDELAY(); | |
349 | ZS_WSYNC(channel); | |
350 | ||
351 | if (ZS_WANTS_MODEM_STATUS(up)) { | |
352 | if (status & SYNC) | |
353 | up->port.icount.dsr++; | |
354 | ||
355 | /* The Zilog just gives us an interrupt when DCD/CTS/etc. change. | |
356 | * But it does not tell us which bit has changed, we have to keep | |
357 | * track of this ourselves. | |
358 | */ | |
359 | if ((status & DCD) ^ up->prev_status) | |
360 | uart_handle_dcd_change(&up->port, | |
361 | (status & DCD)); | |
362 | if ((status & CTS) ^ up->prev_status) | |
363 | uart_handle_cts_change(&up->port, | |
364 | (status & CTS)); | |
365 | ||
366 | wake_up_interruptible(&up->port.info->delta_msr_wait); | |
367 | } | |
368 | ||
369 | up->prev_status = status; | |
370 | } | |
371 | ||
372 | static void ip22zilog_transmit_chars(struct uart_ip22zilog_port *up, | |
373 | struct zilog_channel *channel) | |
374 | { | |
375 | struct circ_buf *xmit; | |
376 | ||
377 | if (ZS_IS_CONS(up)) { | |
378 | unsigned char status = readb(&channel->control); | |
379 | ZSDELAY(); | |
380 | ||
381 | /* TX still busy? Just wait for the next TX done interrupt. | |
382 | * | |
383 | * It can occur because of how we do serial console writes. It would | |
384 | * be nice to transmit console writes just like we normally would for | |
385 | * a TTY line. (ie. buffered and TX interrupt driven). That is not | |
386 | * easy because console writes cannot sleep. One solution might be | |
387 | * to poll on enough port->xmit space becomming free. -DaveM | |
388 | */ | |
389 | if (!(status & Tx_BUF_EMP)) | |
390 | return; | |
391 | } | |
392 | ||
393 | up->flags &= ~IP22ZILOG_FLAG_TX_ACTIVE; | |
394 | ||
395 | if (ZS_REGS_HELD(up)) { | |
396 | __load_zsregs(channel, up->curregs); | |
397 | up->flags &= ~IP22ZILOG_FLAG_REGS_HELD; | |
398 | } | |
399 | ||
400 | if (ZS_TX_STOPPED(up)) { | |
401 | up->flags &= ~IP22ZILOG_FLAG_TX_STOPPED; | |
402 | goto ack_tx_int; | |
403 | } | |
404 | ||
405 | if (up->port.x_char) { | |
406 | up->flags |= IP22ZILOG_FLAG_TX_ACTIVE; | |
407 | writeb(up->port.x_char, &channel->data); | |
408 | ZSDELAY(); | |
409 | ZS_WSYNC(channel); | |
410 | ||
411 | up->port.icount.tx++; | |
412 | up->port.x_char = 0; | |
413 | return; | |
414 | } | |
415 | ||
416 | if (up->port.info == NULL) | |
417 | goto ack_tx_int; | |
418 | xmit = &up->port.info->xmit; | |
c4432c41 | 419 | if (uart_circ_empty(xmit)) |
1da177e4 | 420 | goto ack_tx_int; |
1da177e4 LT |
421 | if (uart_tx_stopped(&up->port)) |
422 | goto ack_tx_int; | |
423 | ||
424 | up->flags |= IP22ZILOG_FLAG_TX_ACTIVE; | |
425 | writeb(xmit->buf[xmit->tail], &channel->data); | |
426 | ZSDELAY(); | |
427 | ZS_WSYNC(channel); | |
428 | ||
429 | xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); | |
430 | up->port.icount.tx++; | |
431 | ||
432 | if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) | |
433 | uart_write_wakeup(&up->port); | |
434 | ||
435 | return; | |
436 | ||
437 | ack_tx_int: | |
438 | writeb(RES_Tx_P, &channel->control); | |
439 | ZSDELAY(); | |
440 | ZS_WSYNC(channel); | |
441 | } | |
442 | ||
7d12e780 | 443 | static irqreturn_t ip22zilog_interrupt(int irq, void *dev_id) |
1da177e4 LT |
444 | { |
445 | struct uart_ip22zilog_port *up = dev_id; | |
446 | ||
447 | while (up) { | |
448 | struct zilog_channel *channel | |
449 | = ZILOG_CHANNEL_FROM_PORT(&up->port); | |
450 | unsigned char r3; | |
451 | ||
452 | spin_lock(&up->port.lock); | |
453 | r3 = read_zsreg(channel, R3); | |
454 | ||
455 | /* Channel A */ | |
456 | if (r3 & (CHAEXT | CHATxIP | CHARxIP)) { | |
457 | writeb(RES_H_IUS, &channel->control); | |
458 | ZSDELAY(); | |
459 | ZS_WSYNC(channel); | |
460 | ||
461 | if (r3 & CHARxIP) | |
7d12e780 | 462 | ip22zilog_receive_chars(up, channel); |
1da177e4 | 463 | if (r3 & CHAEXT) |
7d12e780 | 464 | ip22zilog_status_handle(up, channel); |
1da177e4 LT |
465 | if (r3 & CHATxIP) |
466 | ip22zilog_transmit_chars(up, channel); | |
467 | } | |
468 | spin_unlock(&up->port.lock); | |
469 | ||
470 | /* Channel B */ | |
471 | up = up->next; | |
472 | channel = ZILOG_CHANNEL_FROM_PORT(&up->port); | |
473 | ||
474 | spin_lock(&up->port.lock); | |
475 | if (r3 & (CHBEXT | CHBTxIP | CHBRxIP)) { | |
476 | writeb(RES_H_IUS, &channel->control); | |
477 | ZSDELAY(); | |
478 | ZS_WSYNC(channel); | |
479 | ||
480 | if (r3 & CHBRxIP) | |
7d12e780 | 481 | ip22zilog_receive_chars(up, channel); |
1da177e4 | 482 | if (r3 & CHBEXT) |
7d12e780 | 483 | ip22zilog_status_handle(up, channel); |
1da177e4 LT |
484 | if (r3 & CHBTxIP) |
485 | ip22zilog_transmit_chars(up, channel); | |
486 | } | |
487 | spin_unlock(&up->port.lock); | |
488 | ||
489 | up = up->next; | |
490 | } | |
491 | ||
492 | return IRQ_HANDLED; | |
493 | } | |
494 | ||
495 | /* A convenient way to quickly get R0 status. The caller must _not_ hold the | |
496 | * port lock, it is acquired here. | |
497 | */ | |
498 | static __inline__ unsigned char ip22zilog_read_channel_status(struct uart_port *port) | |
499 | { | |
500 | struct zilog_channel *channel; | |
1da177e4 LT |
501 | unsigned char status; |
502 | ||
1da177e4 LT |
503 | channel = ZILOG_CHANNEL_FROM_PORT(port); |
504 | status = readb(&channel->control); | |
505 | ZSDELAY(); | |
506 | ||
1da177e4 LT |
507 | return status; |
508 | } | |
509 | ||
510 | /* The port lock is not held. */ | |
511 | static unsigned int ip22zilog_tx_empty(struct uart_port *port) | |
512 | { | |
c5f4644e | 513 | unsigned long flags; |
1da177e4 LT |
514 | unsigned char status; |
515 | unsigned int ret; | |
516 | ||
c5f4644e RK |
517 | spin_lock_irqsave(&port->lock, flags); |
518 | ||
1da177e4 | 519 | status = ip22zilog_read_channel_status(port); |
c5f4644e RK |
520 | |
521 | spin_unlock_irqrestore(&port->lock, flags); | |
522 | ||
1da177e4 LT |
523 | if (status & Tx_BUF_EMP) |
524 | ret = TIOCSER_TEMT; | |
525 | else | |
526 | ret = 0; | |
527 | ||
528 | return ret; | |
529 | } | |
530 | ||
c5f4644e | 531 | /* The port lock is held and interrupts are disabled. */ |
1da177e4 LT |
532 | static unsigned int ip22zilog_get_mctrl(struct uart_port *port) |
533 | { | |
534 | unsigned char status; | |
535 | unsigned int ret; | |
536 | ||
537 | status = ip22zilog_read_channel_status(port); | |
538 | ||
539 | ret = 0; | |
540 | if (status & DCD) | |
541 | ret |= TIOCM_CAR; | |
542 | if (status & SYNC) | |
543 | ret |= TIOCM_DSR; | |
544 | if (status & CTS) | |
545 | ret |= TIOCM_CTS; | |
546 | ||
547 | return ret; | |
548 | } | |
549 | ||
550 | /* The port lock is held and interrupts are disabled. */ | |
551 | static void ip22zilog_set_mctrl(struct uart_port *port, unsigned int mctrl) | |
552 | { | |
553 | struct uart_ip22zilog_port *up = (struct uart_ip22zilog_port *) port; | |
554 | struct zilog_channel *channel = ZILOG_CHANNEL_FROM_PORT(port); | |
555 | unsigned char set_bits, clear_bits; | |
556 | ||
557 | set_bits = clear_bits = 0; | |
558 | ||
559 | if (mctrl & TIOCM_RTS) | |
560 | set_bits |= RTS; | |
561 | else | |
562 | clear_bits |= RTS; | |
563 | if (mctrl & TIOCM_DTR) | |
564 | set_bits |= DTR; | |
565 | else | |
566 | clear_bits |= DTR; | |
567 | ||
7369a8b3 | 568 | /* NOTE: Not subject to 'transmitter active' rule. */ |
1da177e4 LT |
569 | up->curregs[R5] |= set_bits; |
570 | up->curregs[R5] &= ~clear_bits; | |
571 | write_zsreg(channel, R5, up->curregs[R5]); | |
572 | } | |
573 | ||
574 | /* The port lock is held and interrupts are disabled. */ | |
b129a8cc | 575 | static void ip22zilog_stop_tx(struct uart_port *port) |
1da177e4 LT |
576 | { |
577 | struct uart_ip22zilog_port *up = (struct uart_ip22zilog_port *) port; | |
578 | ||
579 | up->flags |= IP22ZILOG_FLAG_TX_STOPPED; | |
580 | } | |
581 | ||
582 | /* The port lock is held and interrupts are disabled. */ | |
b129a8cc | 583 | static void ip22zilog_start_tx(struct uart_port *port) |
1da177e4 LT |
584 | { |
585 | struct uart_ip22zilog_port *up = (struct uart_ip22zilog_port *) port; | |
586 | struct zilog_channel *channel = ZILOG_CHANNEL_FROM_PORT(port); | |
587 | unsigned char status; | |
588 | ||
589 | up->flags |= IP22ZILOG_FLAG_TX_ACTIVE; | |
590 | up->flags &= ~IP22ZILOG_FLAG_TX_STOPPED; | |
591 | ||
592 | status = readb(&channel->control); | |
593 | ZSDELAY(); | |
594 | ||
595 | /* TX busy? Just wait for the TX done interrupt. */ | |
596 | if (!(status & Tx_BUF_EMP)) | |
597 | return; | |
598 | ||
599 | /* Send the first character to jump-start the TX done | |
600 | * IRQ sending engine. | |
601 | */ | |
602 | if (port->x_char) { | |
603 | writeb(port->x_char, &channel->data); | |
604 | ZSDELAY(); | |
605 | ZS_WSYNC(channel); | |
606 | ||
607 | port->icount.tx++; | |
608 | port->x_char = 0; | |
609 | } else { | |
610 | struct circ_buf *xmit = &port->info->xmit; | |
611 | ||
612 | writeb(xmit->buf[xmit->tail], &channel->data); | |
613 | ZSDELAY(); | |
614 | ZS_WSYNC(channel); | |
615 | ||
616 | xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); | |
617 | port->icount.tx++; | |
618 | ||
619 | if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) | |
620 | uart_write_wakeup(&up->port); | |
621 | } | |
622 | } | |
623 | ||
624 | /* The port lock is held and interrupts are disabled. */ | |
625 | static void ip22zilog_stop_rx(struct uart_port *port) | |
626 | { | |
627 | struct uart_ip22zilog_port *up = UART_ZILOG(port); | |
628 | struct zilog_channel *channel; | |
629 | ||
630 | if (ZS_IS_CONS(up)) | |
631 | return; | |
632 | ||
633 | channel = ZILOG_CHANNEL_FROM_PORT(port); | |
634 | ||
635 | /* Disable all RX interrupts. */ | |
636 | up->curregs[R1] &= ~RxINT_MASK; | |
637 | ip22zilog_maybe_update_regs(up, channel); | |
638 | } | |
639 | ||
640 | /* The port lock is held. */ | |
641 | static void ip22zilog_enable_ms(struct uart_port *port) | |
642 | { | |
643 | struct uart_ip22zilog_port *up = (struct uart_ip22zilog_port *) port; | |
644 | struct zilog_channel *channel = ZILOG_CHANNEL_FROM_PORT(port); | |
645 | unsigned char new_reg; | |
646 | ||
647 | new_reg = up->curregs[R15] | (DCDIE | SYNCIE | CTSIE); | |
648 | if (new_reg != up->curregs[R15]) { | |
649 | up->curregs[R15] = new_reg; | |
650 | ||
7369a8b3 | 651 | /* NOTE: Not subject to 'transmitter active' rule. */ |
1da177e4 LT |
652 | write_zsreg(channel, R15, up->curregs[R15]); |
653 | } | |
654 | } | |
655 | ||
656 | /* The port lock is not held. */ | |
657 | static void ip22zilog_break_ctl(struct uart_port *port, int break_state) | |
658 | { | |
659 | struct uart_ip22zilog_port *up = (struct uart_ip22zilog_port *) port; | |
660 | struct zilog_channel *channel = ZILOG_CHANNEL_FROM_PORT(port); | |
661 | unsigned char set_bits, clear_bits, new_reg; | |
662 | unsigned long flags; | |
663 | ||
664 | set_bits = clear_bits = 0; | |
665 | ||
666 | if (break_state) | |
667 | set_bits |= SND_BRK; | |
668 | else | |
669 | clear_bits |= SND_BRK; | |
670 | ||
671 | spin_lock_irqsave(&port->lock, flags); | |
672 | ||
673 | new_reg = (up->curregs[R5] | set_bits) & ~clear_bits; | |
674 | if (new_reg != up->curregs[R5]) { | |
675 | up->curregs[R5] = new_reg; | |
676 | ||
7369a8b3 | 677 | /* NOTE: Not subject to 'transmitter active' rule. */ |
1da177e4 LT |
678 | write_zsreg(channel, R5, up->curregs[R5]); |
679 | } | |
680 | ||
681 | spin_unlock_irqrestore(&port->lock, flags); | |
682 | } | |
683 | ||
684 | static void __ip22zilog_startup(struct uart_ip22zilog_port *up) | |
685 | { | |
686 | struct zilog_channel *channel; | |
687 | ||
688 | channel = ZILOG_CHANNEL_FROM_PORT(&up->port); | |
689 | up->prev_status = readb(&channel->control); | |
690 | ||
691 | /* Enable receiver and transmitter. */ | |
692 | up->curregs[R3] |= RxENAB; | |
693 | up->curregs[R5] |= TxENAB; | |
694 | ||
695 | up->curregs[R1] |= EXT_INT_ENAB | INT_ALL_Rx | TxINT_ENAB; | |
696 | ip22zilog_maybe_update_regs(up, channel); | |
697 | } | |
698 | ||
699 | static int ip22zilog_startup(struct uart_port *port) | |
700 | { | |
701 | struct uart_ip22zilog_port *up = UART_ZILOG(port); | |
702 | unsigned long flags; | |
703 | ||
704 | if (ZS_IS_CONS(up)) | |
705 | return 0; | |
706 | ||
707 | spin_lock_irqsave(&port->lock, flags); | |
708 | __ip22zilog_startup(up); | |
709 | spin_unlock_irqrestore(&port->lock, flags); | |
710 | return 0; | |
711 | } | |
712 | ||
713 | /* | |
714 | * The test for ZS_IS_CONS is explained by the following e-mail: | |
715 | ***** | |
716 | * From: Russell King <rmk@arm.linux.org.uk> | |
717 | * Date: Sun, 8 Dec 2002 10:18:38 +0000 | |
718 | * | |
719 | * On Sun, Dec 08, 2002 at 02:43:36AM -0500, Pete Zaitcev wrote: | |
720 | * > I boot my 2.5 boxes using "console=ttyS0,9600" argument, | |
721 | * > and I noticed that something is not right with reference | |
722 | * > counting in this case. It seems that when the console | |
723 | * > is open by kernel initially, this is not accounted | |
724 | * > as an open, and uart_startup is not called. | |
725 | * | |
726 | * That is correct. We are unable to call uart_startup when the serial | |
727 | * console is initialised because it may need to allocate memory (as | |
728 | * request_irq does) and the memory allocators may not have been | |
729 | * initialised. | |
730 | * | |
731 | * 1. initialise the port into a state where it can send characters in the | |
732 | * console write method. | |
733 | * | |
734 | * 2. don't do the actual hardware shutdown in your shutdown() method (but | |
735 | * do the normal software shutdown - ie, free irqs etc) | |
736 | ***** | |
737 | */ | |
738 | static void ip22zilog_shutdown(struct uart_port *port) | |
739 | { | |
740 | struct uart_ip22zilog_port *up = UART_ZILOG(port); | |
741 | struct zilog_channel *channel; | |
742 | unsigned long flags; | |
743 | ||
744 | if (ZS_IS_CONS(up)) | |
745 | return; | |
746 | ||
747 | spin_lock_irqsave(&port->lock, flags); | |
748 | ||
749 | channel = ZILOG_CHANNEL_FROM_PORT(port); | |
750 | ||
751 | /* Disable receiver and transmitter. */ | |
752 | up->curregs[R3] &= ~RxENAB; | |
753 | up->curregs[R5] &= ~TxENAB; | |
754 | ||
755 | /* Disable all interrupts and BRK assertion. */ | |
756 | up->curregs[R1] &= ~(EXT_INT_ENAB | TxINT_ENAB | RxINT_MASK); | |
757 | up->curregs[R5] &= ~SND_BRK; | |
758 | ip22zilog_maybe_update_regs(up, channel); | |
759 | ||
760 | spin_unlock_irqrestore(&port->lock, flags); | |
761 | } | |
762 | ||
763 | /* Shared by TTY driver and serial console setup. The port lock is held | |
764 | * and local interrupts are disabled. | |
765 | */ | |
766 | static void | |
767 | ip22zilog_convert_to_zs(struct uart_ip22zilog_port *up, unsigned int cflag, | |
768 | unsigned int iflag, int brg) | |
769 | { | |
770 | ||
771 | up->curregs[R10] = NRZ; | |
772 | up->curregs[R11] = TCBR | RCBR; | |
773 | ||
774 | /* Program BAUD and clock source. */ | |
775 | up->curregs[R4] &= ~XCLK_MASK; | |
776 | up->curregs[R4] |= X16CLK; | |
777 | up->curregs[R12] = brg & 0xff; | |
778 | up->curregs[R13] = (brg >> 8) & 0xff; | |
779 | up->curregs[R14] = BRENAB; | |
780 | ||
781 | /* Character size, stop bits, and parity. */ | |
782 | up->curregs[3] &= ~RxN_MASK; | |
783 | up->curregs[5] &= ~TxN_MASK; | |
784 | switch (cflag & CSIZE) { | |
785 | case CS5: | |
786 | up->curregs[3] |= Rx5; | |
787 | up->curregs[5] |= Tx5; | |
788 | up->parity_mask = 0x1f; | |
789 | break; | |
790 | case CS6: | |
791 | up->curregs[3] |= Rx6; | |
792 | up->curregs[5] |= Tx6; | |
793 | up->parity_mask = 0x3f; | |
794 | break; | |
795 | case CS7: | |
796 | up->curregs[3] |= Rx7; | |
797 | up->curregs[5] |= Tx7; | |
798 | up->parity_mask = 0x7f; | |
799 | break; | |
800 | case CS8: | |
801 | default: | |
802 | up->curregs[3] |= Rx8; | |
803 | up->curregs[5] |= Tx8; | |
804 | up->parity_mask = 0xff; | |
805 | break; | |
806 | }; | |
807 | up->curregs[4] &= ~0x0c; | |
808 | if (cflag & CSTOPB) | |
809 | up->curregs[4] |= SB2; | |
810 | else | |
811 | up->curregs[4] |= SB1; | |
812 | if (cflag & PARENB) | |
813 | up->curregs[4] |= PAR_ENAB; | |
814 | else | |
815 | up->curregs[4] &= ~PAR_ENAB; | |
816 | if (!(cflag & PARODD)) | |
817 | up->curregs[4] |= PAR_EVEN; | |
818 | else | |
819 | up->curregs[4] &= ~PAR_EVEN; | |
820 | ||
821 | up->port.read_status_mask = Rx_OVR; | |
822 | if (iflag & INPCK) | |
823 | up->port.read_status_mask |= CRC_ERR | PAR_ERR; | |
824 | if (iflag & (BRKINT | PARMRK)) | |
825 | up->port.read_status_mask |= BRK_ABRT; | |
826 | ||
827 | up->port.ignore_status_mask = 0; | |
828 | if (iflag & IGNPAR) | |
829 | up->port.ignore_status_mask |= CRC_ERR | PAR_ERR; | |
830 | if (iflag & IGNBRK) { | |
831 | up->port.ignore_status_mask |= BRK_ABRT; | |
832 | if (iflag & IGNPAR) | |
833 | up->port.ignore_status_mask |= Rx_OVR; | |
834 | } | |
835 | ||
836 | if ((cflag & CREAD) == 0) | |
837 | up->port.ignore_status_mask = 0xff; | |
838 | } | |
839 | ||
840 | /* The port lock is not held. */ | |
841 | static void | |
606d099c AC |
842 | ip22zilog_set_termios(struct uart_port *port, struct ktermios *termios, |
843 | struct ktermios *old) | |
1da177e4 LT |
844 | { |
845 | struct uart_ip22zilog_port *up = (struct uart_ip22zilog_port *) port; | |
846 | unsigned long flags; | |
847 | int baud, brg; | |
848 | ||
849 | baud = uart_get_baud_rate(port, termios, old, 1200, 76800); | |
850 | ||
851 | spin_lock_irqsave(&up->port.lock, flags); | |
852 | ||
853 | brg = BPS_TO_BRG(baud, ZS_CLOCK / ZS_CLOCK_DIVISOR); | |
854 | ||
855 | ip22zilog_convert_to_zs(up, termios->c_cflag, termios->c_iflag, brg); | |
856 | ||
857 | if (UART_ENABLE_MS(&up->port, termios->c_cflag)) | |
858 | up->flags |= IP22ZILOG_FLAG_MODEM_STATUS; | |
859 | else | |
860 | up->flags &= ~IP22ZILOG_FLAG_MODEM_STATUS; | |
861 | ||
862 | up->cflag = termios->c_cflag; | |
863 | ||
864 | ip22zilog_maybe_update_regs(up, ZILOG_CHANNEL_FROM_PORT(port)); | |
c1fbac44 | 865 | uart_update_timeout(port, termios->c_cflag, baud); |
1da177e4 LT |
866 | |
867 | spin_unlock_irqrestore(&up->port.lock, flags); | |
868 | } | |
869 | ||
870 | static const char *ip22zilog_type(struct uart_port *port) | |
871 | { | |
872 | return "IP22-Zilog"; | |
873 | } | |
874 | ||
875 | /* We do not request/release mappings of the registers here, this | |
876 | * happens at early serial probe time. | |
877 | */ | |
878 | static void ip22zilog_release_port(struct uart_port *port) | |
879 | { | |
880 | } | |
881 | ||
882 | static int ip22zilog_request_port(struct uart_port *port) | |
883 | { | |
884 | return 0; | |
885 | } | |
886 | ||
887 | /* These do not need to do anything interesting either. */ | |
888 | static void ip22zilog_config_port(struct uart_port *port, int flags) | |
889 | { | |
890 | } | |
891 | ||
892 | /* We do not support letting the user mess with the divisor, IRQ, etc. */ | |
893 | static int ip22zilog_verify_port(struct uart_port *port, struct serial_struct *ser) | |
894 | { | |
895 | return -EINVAL; | |
896 | } | |
897 | ||
898 | static struct uart_ops ip22zilog_pops = { | |
899 | .tx_empty = ip22zilog_tx_empty, | |
900 | .set_mctrl = ip22zilog_set_mctrl, | |
901 | .get_mctrl = ip22zilog_get_mctrl, | |
902 | .stop_tx = ip22zilog_stop_tx, | |
903 | .start_tx = ip22zilog_start_tx, | |
904 | .stop_rx = ip22zilog_stop_rx, | |
905 | .enable_ms = ip22zilog_enable_ms, | |
906 | .break_ctl = ip22zilog_break_ctl, | |
907 | .startup = ip22zilog_startup, | |
908 | .shutdown = ip22zilog_shutdown, | |
909 | .set_termios = ip22zilog_set_termios, | |
910 | .type = ip22zilog_type, | |
911 | .release_port = ip22zilog_release_port, | |
912 | .request_port = ip22zilog_request_port, | |
913 | .config_port = ip22zilog_config_port, | |
914 | .verify_port = ip22zilog_verify_port, | |
915 | }; | |
916 | ||
917 | static struct uart_ip22zilog_port *ip22zilog_port_table; | |
918 | static struct zilog_layout **ip22zilog_chip_regs; | |
919 | ||
920 | static struct uart_ip22zilog_port *ip22zilog_irq_chain; | |
921 | static int zilog_irq = -1; | |
922 | ||
923 | static void * __init alloc_one_table(unsigned long size) | |
924 | { | |
8f31bb39 | 925 | return kzalloc(size, GFP_KERNEL); |
1da177e4 LT |
926 | } |
927 | ||
928 | static void __init ip22zilog_alloc_tables(void) | |
929 | { | |
930 | ip22zilog_port_table = (struct uart_ip22zilog_port *) | |
931 | alloc_one_table(NUM_CHANNELS * sizeof(struct uart_ip22zilog_port)); | |
932 | ip22zilog_chip_regs = (struct zilog_layout **) | |
933 | alloc_one_table(NUM_IP22ZILOG * sizeof(struct zilog_layout *)); | |
934 | ||
935 | if (ip22zilog_port_table == NULL || ip22zilog_chip_regs == NULL) { | |
936 | panic("IP22-Zilog: Cannot allocate IP22-Zilog tables."); | |
937 | } | |
938 | } | |
939 | ||
940 | /* Get the address of the registers for IP22-Zilog instance CHIP. */ | |
941 | static struct zilog_layout * __init get_zs(int chip) | |
942 | { | |
943 | unsigned long base; | |
944 | ||
945 | if (chip < 0 || chip >= NUM_IP22ZILOG) { | |
946 | panic("IP22-Zilog: Illegal chip number %d in get_zs.", chip); | |
947 | } | |
948 | ||
949 | /* Not probe-able, hard code it. */ | |
950 | base = (unsigned long) &sgioc->uart; | |
951 | ||
952 | zilog_irq = SGI_SERIAL_IRQ; | |
953 | request_mem_region(base, 8, "IP22-Zilog"); | |
954 | ||
955 | return (struct zilog_layout *) base; | |
956 | } | |
957 | ||
958 | #define ZS_PUT_CHAR_MAX_DELAY 2000 /* 10 ms */ | |
959 | ||
960 | #ifdef CONFIG_SERIAL_IP22_ZILOG_CONSOLE | |
d358788f | 961 | static void ip22zilog_put_char(struct uart_port *port, int ch) |
1da177e4 | 962 | { |
d358788f | 963 | struct zilog_channel *channel = ZILOG_CHANNEL_FROM_PORT(port); |
1da177e4 LT |
964 | int loops = ZS_PUT_CHAR_MAX_DELAY; |
965 | ||
966 | /* This is a timed polling loop so do not switch the explicit | |
967 | * udelay with ZSDELAY as that is a NOP on some platforms. -DaveM | |
968 | */ | |
969 | do { | |
970 | unsigned char val = readb(&channel->control); | |
971 | if (val & Tx_BUF_EMP) { | |
972 | ZSDELAY(); | |
973 | break; | |
974 | } | |
975 | udelay(5); | |
976 | } while (--loops); | |
977 | ||
978 | writeb(ch, &channel->data); | |
979 | ZSDELAY(); | |
980 | ZS_WSYNC(channel); | |
981 | } | |
982 | ||
983 | static void | |
984 | ip22zilog_console_write(struct console *con, const char *s, unsigned int count) | |
985 | { | |
986 | struct uart_ip22zilog_port *up = &ip22zilog_port_table[con->index]; | |
1da177e4 | 987 | unsigned long flags; |
1da177e4 LT |
988 | |
989 | spin_lock_irqsave(&up->port.lock, flags); | |
d358788f | 990 | uart_console_write(&up->port, s, count, ip22zilog_put_char); |
1da177e4 LT |
991 | udelay(2); |
992 | spin_unlock_irqrestore(&up->port.lock, flags); | |
993 | } | |
994 | ||
995 | void | |
996 | ip22serial_console_termios(struct console *con, char *options) | |
997 | { | |
998 | int baud = 9600, bits = 8, cflag; | |
999 | int parity = 'n'; | |
1000 | int flow = 'n'; | |
1001 | ||
1002 | if (options) | |
1003 | uart_parse_options(options, &baud, &parity, &bits, &flow); | |
1004 | ||
1005 | cflag = CREAD | HUPCL | CLOCAL; | |
1006 | ||
1007 | switch (baud) { | |
1008 | case 150: cflag |= B150; break; | |
1009 | case 300: cflag |= B300; break; | |
1010 | case 600: cflag |= B600; break; | |
1011 | case 1200: cflag |= B1200; break; | |
1012 | case 2400: cflag |= B2400; break; | |
1013 | case 4800: cflag |= B4800; break; | |
1014 | case 9600: cflag |= B9600; break; | |
1015 | case 19200: cflag |= B19200; break; | |
1016 | case 38400: cflag |= B38400; break; | |
1017 | default: baud = 9600; cflag |= B9600; break; | |
1018 | } | |
1019 | ||
1020 | con->cflag = cflag | CS8; /* 8N1 */ | |
c1fbac44 TS |
1021 | |
1022 | uart_update_timeout(&ip22zilog_port_table[con->index].port, cflag, baud); | |
1da177e4 LT |
1023 | } |
1024 | ||
1025 | static int __init ip22zilog_console_setup(struct console *con, char *options) | |
1026 | { | |
1027 | struct uart_ip22zilog_port *up = &ip22zilog_port_table[con->index]; | |
1028 | unsigned long flags; | |
1029 | int baud, brg; | |
1030 | ||
1031 | printk("Console: ttyS%d (IP22-Zilog)\n", con->index); | |
1032 | ||
1033 | /* Get firmware console settings. */ | |
1034 | ip22serial_console_termios(con, options); | |
1035 | ||
1036 | /* Firmware console speed is limited to 150-->38400 baud so | |
1037 | * this hackish cflag thing is OK. | |
1038 | */ | |
1039 | switch (con->cflag & CBAUD) { | |
1040 | case B150: baud = 150; break; | |
1041 | case B300: baud = 300; break; | |
1042 | case B600: baud = 600; break; | |
1043 | case B1200: baud = 1200; break; | |
1044 | case B2400: baud = 2400; break; | |
1045 | case B4800: baud = 4800; break; | |
1046 | default: case B9600: baud = 9600; break; | |
1047 | case B19200: baud = 19200; break; | |
1048 | case B38400: baud = 38400; break; | |
1049 | }; | |
1050 | ||
1051 | brg = BPS_TO_BRG(baud, ZS_CLOCK / ZS_CLOCK_DIVISOR); | |
1052 | ||
1053 | spin_lock_irqsave(&up->port.lock, flags); | |
1054 | ||
1055 | up->curregs[R15] = BRKIE; | |
1056 | ip22zilog_convert_to_zs(up, con->cflag, 0, brg); | |
1057 | ||
1058 | __ip22zilog_startup(up); | |
1059 | ||
1060 | spin_unlock_irqrestore(&up->port.lock, flags); | |
1061 | ||
1062 | return 0; | |
1063 | } | |
1064 | ||
1065 | static struct uart_driver ip22zilog_reg; | |
1066 | ||
1067 | static struct console ip22zilog_console = { | |
1068 | .name = "ttyS", | |
1069 | .write = ip22zilog_console_write, | |
1070 | .device = uart_console_device, | |
1071 | .setup = ip22zilog_console_setup, | |
1072 | .flags = CON_PRINTBUFFER, | |
1073 | .index = -1, | |
1074 | .data = &ip22zilog_reg, | |
1075 | }; | |
1076 | #endif /* CONFIG_SERIAL_IP22_ZILOG_CONSOLE */ | |
1077 | ||
1078 | static struct uart_driver ip22zilog_reg = { | |
1079 | .owner = THIS_MODULE, | |
1080 | .driver_name = "serial", | |
1da177e4 LT |
1081 | .dev_name = "ttyS", |
1082 | .major = TTY_MAJOR, | |
1083 | .minor = 64, | |
1084 | .nr = NUM_CHANNELS, | |
1085 | #ifdef CONFIG_SERIAL_IP22_ZILOG_CONSOLE | |
1086 | .cons = &ip22zilog_console, | |
1087 | #endif | |
1088 | }; | |
1089 | ||
1090 | static void __init ip22zilog_prepare(void) | |
1091 | { | |
1092 | struct uart_ip22zilog_port *up; | |
1093 | struct zilog_layout *rp; | |
1094 | int channel, chip; | |
1095 | ||
1096 | /* | |
1097 | * Temporary fix. | |
1098 | */ | |
1099 | for (channel = 0; channel < NUM_CHANNELS; channel++) | |
1100 | spin_lock_init(&ip22zilog_port_table[channel].port.lock); | |
1101 | ||
1102 | ip22zilog_irq_chain = &ip22zilog_port_table[NUM_CHANNELS - 1]; | |
1103 | up = &ip22zilog_port_table[0]; | |
1104 | for (channel = NUM_CHANNELS - 1 ; channel > 0; channel--) | |
1105 | up[channel].next = &up[channel - 1]; | |
1106 | up[channel].next = NULL; | |
1107 | ||
1108 | for (chip = 0; chip < NUM_IP22ZILOG; chip++) { | |
1109 | if (!ip22zilog_chip_regs[chip]) { | |
1110 | ip22zilog_chip_regs[chip] = rp = get_zs(chip); | |
1111 | ||
1112 | up[(chip * 2) + 0].port.membase = (char *) &rp->channelB; | |
1113 | up[(chip * 2) + 1].port.membase = (char *) &rp->channelA; | |
1114 | ||
1115 | /* In theory mapbase is the physical address ... */ | |
1116 | up[(chip * 2) + 0].port.mapbase = | |
1117 | (unsigned long) ioremap((unsigned long) &rp->channelB, 8); | |
1118 | up[(chip * 2) + 1].port.mapbase = | |
1119 | (unsigned long) ioremap((unsigned long) &rp->channelA, 8); | |
1120 | } | |
1121 | ||
1122 | /* Channel A */ | |
1123 | up[(chip * 2) + 0].port.iotype = UPIO_MEM; | |
1124 | up[(chip * 2) + 0].port.irq = zilog_irq; | |
1125 | up[(chip * 2) + 0].port.uartclk = ZS_CLOCK; | |
1126 | up[(chip * 2) + 0].port.fifosize = 1; | |
1127 | up[(chip * 2) + 0].port.ops = &ip22zilog_pops; | |
1128 | up[(chip * 2) + 0].port.type = PORT_IP22ZILOG; | |
1129 | up[(chip * 2) + 0].port.flags = 0; | |
1130 | up[(chip * 2) + 0].port.line = (chip * 2) + 0; | |
1131 | up[(chip * 2) + 0].flags = 0; | |
1132 | ||
1133 | /* Channel B */ | |
1134 | up[(chip * 2) + 1].port.iotype = UPIO_MEM; | |
1135 | up[(chip * 2) + 1].port.irq = zilog_irq; | |
1136 | up[(chip * 2) + 1].port.uartclk = ZS_CLOCK; | |
1137 | up[(chip * 2) + 1].port.fifosize = 1; | |
1138 | up[(chip * 2) + 1].port.ops = &ip22zilog_pops; | |
1139 | up[(chip * 2) + 1].port.type = PORT_IP22ZILOG; | |
1da177e4 | 1140 | up[(chip * 2) + 1].port.line = (chip * 2) + 1; |
c65b15cf | 1141 | up[(chip * 2) + 1].flags |= IP22ZILOG_FLAG_IS_CHANNEL_A; |
1da177e4 LT |
1142 | } |
1143 | } | |
1144 | ||
1145 | static void __init ip22zilog_init_hw(void) | |
1146 | { | |
1147 | int i; | |
1148 | ||
1149 | for (i = 0; i < NUM_CHANNELS; i++) { | |
1150 | struct uart_ip22zilog_port *up = &ip22zilog_port_table[i]; | |
1151 | struct zilog_channel *channel = ZILOG_CHANNEL_FROM_PORT(&up->port); | |
1152 | unsigned long flags; | |
1153 | int baud, brg; | |
1154 | ||
1155 | spin_lock_irqsave(&up->port.lock, flags); | |
1156 | ||
1157 | if (ZS_IS_CHANNEL_A(up)) { | |
1158 | write_zsreg(channel, R9, FHWRES); | |
1159 | ZSDELAY_LONG(); | |
1160 | (void) read_zsreg(channel, R0); | |
1161 | } | |
1162 | ||
1163 | /* Normal serial TTY. */ | |
1164 | up->parity_mask = 0xff; | |
1165 | up->curregs[R1] = EXT_INT_ENAB | INT_ALL_Rx | TxINT_ENAB; | |
1166 | up->curregs[R4] = PAR_EVEN | X16CLK | SB1; | |
1167 | up->curregs[R3] = RxENAB | Rx8; | |
1168 | up->curregs[R5] = TxENAB | Tx8; | |
1169 | up->curregs[R9] = NV | MIE; | |
1170 | up->curregs[R10] = NRZ; | |
1171 | up->curregs[R11] = TCBR | RCBR; | |
1172 | baud = 9600; | |
1173 | brg = BPS_TO_BRG(baud, ZS_CLOCK / ZS_CLOCK_DIVISOR); | |
1174 | up->curregs[R12] = (brg & 0xff); | |
1175 | up->curregs[R13] = (brg >> 8) & 0xff; | |
1176 | up->curregs[R14] = BRENAB; | |
1177 | __load_zsregs(channel, up->curregs); | |
1178 | /* set master interrupt enable */ | |
1179 | write_zsreg(channel, R9, up->curregs[R9]); | |
1180 | ||
1181 | spin_unlock_irqrestore(&up->port.lock, flags); | |
1182 | } | |
1183 | } | |
1184 | ||
1185 | static int __init ip22zilog_ports_init(void) | |
1186 | { | |
1187 | int ret; | |
1188 | ||
1189 | printk(KERN_INFO "Serial: IP22 Zilog driver (%d chips).\n", NUM_IP22ZILOG); | |
1190 | ||
1191 | ip22zilog_prepare(); | |
1192 | ||
1193 | if (request_irq(zilog_irq, ip22zilog_interrupt, 0, | |
1194 | "IP22-Zilog", ip22zilog_irq_chain)) { | |
1195 | panic("IP22-Zilog: Unable to register zs interrupt handler.\n"); | |
1196 | } | |
1197 | ||
1198 | ip22zilog_init_hw(); | |
1199 | ||
1200 | ret = uart_register_driver(&ip22zilog_reg); | |
1201 | if (ret == 0) { | |
1202 | int i; | |
1203 | ||
1204 | for (i = 0; i < NUM_CHANNELS; i++) { | |
1205 | struct uart_ip22zilog_port *up = &ip22zilog_port_table[i]; | |
1206 | ||
1207 | uart_add_one_port(&ip22zilog_reg, &up->port); | |
1208 | } | |
1209 | } | |
1210 | ||
1211 | return ret; | |
1212 | } | |
1213 | ||
1214 | static int __init ip22zilog_init(void) | |
1215 | { | |
1216 | /* IP22 Zilog setup is hard coded, no probing to do. */ | |
1217 | ip22zilog_alloc_tables(); | |
1218 | ip22zilog_ports_init(); | |
1219 | ||
1220 | return 0; | |
1221 | } | |
1222 | ||
1223 | static void __exit ip22zilog_exit(void) | |
1224 | { | |
1225 | int i; | |
6257b3bd | 1226 | struct uart_ip22zilog_port *up; |
1da177e4 LT |
1227 | |
1228 | for (i = 0; i < NUM_CHANNELS; i++) { | |
6257b3bd | 1229 | up = &ip22zilog_port_table[i]; |
1da177e4 LT |
1230 | |
1231 | uart_remove_one_port(&ip22zilog_reg, &up->port); | |
1232 | } | |
1233 | ||
6257b3bd AL |
1234 | /* Free IO mem */ |
1235 | up = &ip22zilog_port_table[0]; | |
1236 | for (i = 0; i < NUM_IP22ZILOG; i++) { | |
1237 | if (up[(i * 2) + 0].port.mapbase) { | |
1238 | iounmap((void*)up[(i * 2) + 0].port.mapbase); | |
1239 | up[(i * 2) + 0].port.mapbase = 0; | |
1240 | } | |
1241 | if (up[(i * 2) + 1].port.mapbase) { | |
1242 | iounmap((void*)up[(i * 2) + 1].port.mapbase); | |
1243 | up[(i * 2) + 1].port.mapbase = 0; | |
1244 | } | |
1245 | } | |
1246 | ||
1da177e4 LT |
1247 | uart_unregister_driver(&ip22zilog_reg); |
1248 | } | |
1249 | ||
1250 | module_init(ip22zilog_init); | |
1251 | module_exit(ip22zilog_exit); | |
1252 | ||
1253 | /* David wrote it but I'm to blame for the bugs ... */ | |
1254 | MODULE_AUTHOR("Ralf Baechle <ralf@linux-mips.org>"); | |
1255 | MODULE_DESCRIPTION("SGI Zilog serial port driver"); | |
1256 | MODULE_LICENSE("GPL"); |