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1da177e4 LT |
1 | /* |
2 | * decserial.c: Serial port driver for IOASIC DECstations. | |
3 | * | |
4 | * Derived from drivers/sbus/char/sunserial.c by Paul Mackerras. | |
5 | * Derived from drivers/macintosh/macserial.c by Harald Koerfgen. | |
6 | * | |
7 | * DECstation changes | |
8 | * Copyright (C) 1998-2000 Harald Koerfgen | |
9 | * Copyright (C) 2000, 2001, 2002, 2003, 2004 Maciej W. Rozycki | |
10 | * | |
11 | * For the rest of the code the original Copyright applies: | |
12 | * Copyright (C) 1996 Paul Mackerras (Paul.Mackerras@cs.anu.edu.au) | |
13 | * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu) | |
14 | * | |
15 | * | |
16 | * Note: for IOASIC systems the wiring is as follows: | |
17 | * | |
18 | * mouse/keyboard: | |
19 | * DIN-7 MJ-4 signal SCC | |
20 | * 2 1 TxD <- A.TxD | |
21 | * 3 4 RxD -> A.RxD | |
22 | * | |
23 | * EIA-232/EIA-423: | |
24 | * DB-25 MMJ-6 signal SCC | |
25 | * 2 2 TxD <- B.TxD | |
26 | * 3 5 RxD -> B.RxD | |
27 | * 4 RTS <- ~A.RTS | |
28 | * 5 CTS -> ~B.CTS | |
29 | * 6 6 DSR -> ~A.SYNC | |
30 | * 8 CD -> ~B.DCD | |
31 | * 12 DSRS(DCE) -> ~A.CTS (*) | |
32 | * 15 TxC -> B.TxC | |
33 | * 17 RxC -> B.RxC | |
34 | * 20 1 DTR <- ~A.DTR | |
35 | * 22 RI -> ~A.DCD | |
36 | * 23 DSRS(DTE) <- ~B.RTS | |
37 | * | |
38 | * (*) EIA-232 defines the signal at this pin to be SCD, while DSRS(DCE) | |
39 | * is shared with DSRS(DTE) at pin 23. | |
40 | */ | |
41 | ||
42 | #include <linux/config.h> | |
43 | #include <linux/errno.h> | |
44 | #include <linux/signal.h> | |
45 | #include <linux/sched.h> | |
46 | #include <linux/timer.h> | |
47 | #include <linux/interrupt.h> | |
48 | #include <linux/tty.h> | |
49 | #include <linux/tty_flip.h> | |
50 | #include <linux/major.h> | |
51 | #include <linux/string.h> | |
52 | #include <linux/fcntl.h> | |
53 | #include <linux/mm.h> | |
54 | #include <linux/kernel.h> | |
55 | #include <linux/delay.h> | |
56 | #include <linux/init.h> | |
57 | #include <linux/ioport.h> | |
58 | #ifdef CONFIG_SERIAL_DEC_CONSOLE | |
59 | #include <linux/console.h> | |
60 | #endif | |
61 | ||
62 | #include <asm/io.h> | |
63 | #include <asm/pgtable.h> | |
64 | #include <asm/irq.h> | |
65 | #include <asm/system.h> | |
66 | #include <asm/uaccess.h> | |
67 | #include <asm/bootinfo.h> | |
68 | #include <asm/dec/serial.h> | |
69 | ||
70 | #ifdef CONFIG_MACH_DECSTATION | |
71 | #include <asm/dec/interrupts.h> | |
72 | #include <asm/dec/machtype.h> | |
73 | #include <asm/dec/tc.h> | |
74 | #include <asm/dec/ioasic_addrs.h> | |
75 | #endif | |
76 | #ifdef CONFIG_KGDB | |
77 | #include <asm/kgdb.h> | |
78 | #endif | |
79 | #ifdef CONFIG_MAGIC_SYSRQ | |
80 | #include <linux/sysrq.h> | |
81 | #endif | |
82 | ||
83 | #include "zs.h" | |
84 | ||
85 | /* | |
86 | * It would be nice to dynamically allocate everything that | |
87 | * depends on NUM_SERIAL, so we could support any number of | |
88 | * Z8530s, but for now... | |
89 | */ | |
90 | #define NUM_SERIAL 2 /* Max number of ZS chips supported */ | |
91 | #define NUM_CHANNELS (NUM_SERIAL * 2) /* 2 channels per chip */ | |
92 | #define CHANNEL_A_NR (zs_parms->channel_a_offset > zs_parms->channel_b_offset) | |
93 | /* Number of channel A in the chip */ | |
94 | #define ZS_CHAN_IO_SIZE 8 | |
95 | #define ZS_CLOCK 7372800 /* Z8530 RTxC input clock rate */ | |
96 | ||
97 | #define RECOVERY_DELAY udelay(2) | |
98 | ||
99 | struct zs_parms { | |
100 | unsigned long scc0; | |
101 | unsigned long scc1; | |
102 | int channel_a_offset; | |
103 | int channel_b_offset; | |
104 | int irq0; | |
105 | int irq1; | |
106 | int clock; | |
107 | }; | |
108 | ||
109 | static struct zs_parms *zs_parms; | |
110 | ||
111 | #ifdef CONFIG_MACH_DECSTATION | |
112 | static struct zs_parms ds_parms = { | |
113 | scc0 : IOASIC_SCC0, | |
114 | scc1 : IOASIC_SCC1, | |
115 | channel_a_offset : 1, | |
116 | channel_b_offset : 9, | |
117 | irq0 : -1, | |
118 | irq1 : -1, | |
119 | clock : ZS_CLOCK | |
120 | }; | |
121 | #endif | |
122 | ||
123 | #ifdef CONFIG_MACH_DECSTATION | |
124 | #define DS_BUS_PRESENT (IOASIC) | |
125 | #else | |
126 | #define DS_BUS_PRESENT 0 | |
127 | #endif | |
128 | ||
129 | #define BUS_PRESENT (DS_BUS_PRESENT) | |
130 | ||
131 | struct dec_zschannel zs_channels[NUM_CHANNELS]; | |
132 | struct dec_serial zs_soft[NUM_CHANNELS]; | |
133 | int zs_channels_found; | |
134 | struct dec_serial *zs_chain; /* list of all channels */ | |
135 | ||
136 | struct tty_struct zs_ttys[NUM_CHANNELS]; | |
137 | ||
138 | #ifdef CONFIG_SERIAL_DEC_CONSOLE | |
139 | static struct console sercons; | |
140 | #endif | |
141 | #if defined(CONFIG_SERIAL_DEC_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ) && \ | |
142 | !defined(MODULE) | |
143 | static unsigned long break_pressed; /* break, really ... */ | |
144 | #endif | |
145 | ||
146 | static unsigned char zs_init_regs[16] __initdata = { | |
147 | 0, /* write 0 */ | |
148 | 0, /* write 1 */ | |
149 | 0, /* write 2 */ | |
150 | 0, /* write 3 */ | |
151 | (X16CLK), /* write 4 */ | |
152 | 0, /* write 5 */ | |
153 | 0, 0, 0, /* write 6, 7, 8 */ | |
154 | (MIE | DLC | NV), /* write 9 */ | |
155 | (NRZ), /* write 10 */ | |
156 | (TCBR | RCBR), /* write 11 */ | |
157 | 0, 0, /* BRG time constant, write 12 + 13 */ | |
158 | (BRSRC | BRENABL), /* write 14 */ | |
159 | 0 /* write 15 */ | |
160 | }; | |
161 | ||
162 | DECLARE_TASK_QUEUE(tq_zs_serial); | |
163 | ||
164 | static struct tty_driver *serial_driver; | |
165 | ||
166 | /* serial subtype definitions */ | |
167 | #define SERIAL_TYPE_NORMAL 1 | |
168 | ||
169 | /* number of characters left in xmit buffer before we ask for more */ | |
170 | #define WAKEUP_CHARS 256 | |
171 | ||
172 | /* | |
173 | * Debugging. | |
174 | */ | |
175 | #undef SERIAL_DEBUG_OPEN | |
176 | #undef SERIAL_DEBUG_FLOW | |
177 | #undef SERIAL_DEBUG_THROTTLE | |
178 | #undef SERIAL_PARANOIA_CHECK | |
179 | ||
180 | #undef ZS_DEBUG_REGS | |
181 | ||
182 | #ifdef SERIAL_DEBUG_THROTTLE | |
183 | #define _tty_name(tty,buf) tty_name(tty,buf) | |
184 | #endif | |
185 | ||
186 | #define RS_STROBE_TIME 10 | |
187 | #define RS_ISR_PASS_LIMIT 256 | |
188 | ||
189 | #define _INLINE_ inline | |
190 | ||
191 | static void probe_sccs(void); | |
192 | static void change_speed(struct dec_serial *info); | |
193 | static void rs_wait_until_sent(struct tty_struct *tty, int timeout); | |
194 | ||
195 | /* | |
196 | * tmp_buf is used as a temporary buffer by serial_write. We need to | |
197 | * lock it in case the copy_from_user blocks while swapping in a page, | |
198 | * and some other program tries to do a serial write at the same time. | |
199 | * Since the lock will only come under contention when the system is | |
200 | * swapping and available memory is low, it makes sense to share one | |
201 | * buffer across all the serial ports, since it significantly saves | |
202 | * memory if large numbers of serial ports are open. | |
203 | */ | |
204 | static unsigned char tmp_buf[4096]; /* This is cheating */ | |
205 | static DECLARE_MUTEX(tmp_buf_sem); | |
206 | ||
207 | static inline int serial_paranoia_check(struct dec_serial *info, | |
208 | char *name, const char *routine) | |
209 | { | |
210 | #ifdef SERIAL_PARANOIA_CHECK | |
211 | static const char *badmagic = | |
212 | "Warning: bad magic number for serial struct %s in %s\n"; | |
213 | static const char *badinfo = | |
214 | "Warning: null mac_serial for %s in %s\n"; | |
215 | ||
216 | if (!info) { | |
217 | printk(badinfo, name, routine); | |
218 | return 1; | |
219 | } | |
220 | if (info->magic != SERIAL_MAGIC) { | |
221 | printk(badmagic, name, routine); | |
222 | return 1; | |
223 | } | |
224 | #endif | |
225 | return 0; | |
226 | } | |
227 | ||
228 | /* | |
229 | * This is used to figure out the divisor speeds and the timeouts | |
230 | */ | |
231 | static int baud_table[] = { | |
232 | 0, 50, 75, 110, 134, 150, 200, 300, 600, 1200, 1800, 2400, 4800, | |
233 | 9600, 19200, 38400, 57600, 115200, 0 }; | |
234 | ||
235 | /* | |
236 | * Reading and writing Z8530 registers. | |
237 | */ | |
238 | static inline unsigned char read_zsreg(struct dec_zschannel *channel, | |
239 | unsigned char reg) | |
240 | { | |
241 | unsigned char retval; | |
242 | ||
243 | if (reg != 0) { | |
244 | *channel->control = reg & 0xf; | |
245 | fast_iob(); RECOVERY_DELAY; | |
246 | } | |
247 | retval = *channel->control; | |
248 | RECOVERY_DELAY; | |
249 | return retval; | |
250 | } | |
251 | ||
252 | static inline void write_zsreg(struct dec_zschannel *channel, | |
253 | unsigned char reg, unsigned char value) | |
254 | { | |
255 | if (reg != 0) { | |
256 | *channel->control = reg & 0xf; | |
257 | fast_iob(); RECOVERY_DELAY; | |
258 | } | |
259 | *channel->control = value; | |
260 | fast_iob(); RECOVERY_DELAY; | |
261 | return; | |
262 | } | |
263 | ||
264 | static inline unsigned char read_zsdata(struct dec_zschannel *channel) | |
265 | { | |
266 | unsigned char retval; | |
267 | ||
268 | retval = *channel->data; | |
269 | RECOVERY_DELAY; | |
270 | return retval; | |
271 | } | |
272 | ||
273 | static inline void write_zsdata(struct dec_zschannel *channel, | |
274 | unsigned char value) | |
275 | { | |
276 | *channel->data = value; | |
277 | fast_iob(); RECOVERY_DELAY; | |
278 | return; | |
279 | } | |
280 | ||
281 | static inline void load_zsregs(struct dec_zschannel *channel, | |
282 | unsigned char *regs) | |
283 | { | |
284 | /* ZS_CLEARERR(channel); | |
285 | ZS_CLEARFIFO(channel); */ | |
286 | /* Load 'em up */ | |
287 | write_zsreg(channel, R3, regs[R3] & ~RxENABLE); | |
288 | write_zsreg(channel, R5, regs[R5] & ~TxENAB); | |
289 | write_zsreg(channel, R4, regs[R4]); | |
290 | write_zsreg(channel, R9, regs[R9]); | |
291 | write_zsreg(channel, R1, regs[R1]); | |
292 | write_zsreg(channel, R2, regs[R2]); | |
293 | write_zsreg(channel, R10, regs[R10]); | |
294 | write_zsreg(channel, R11, regs[R11]); | |
295 | write_zsreg(channel, R12, regs[R12]); | |
296 | write_zsreg(channel, R13, regs[R13]); | |
297 | write_zsreg(channel, R14, regs[R14]); | |
298 | write_zsreg(channel, R15, regs[R15]); | |
299 | write_zsreg(channel, R3, regs[R3]); | |
300 | write_zsreg(channel, R5, regs[R5]); | |
301 | return; | |
302 | } | |
303 | ||
304 | /* Sets or clears DTR/RTS on the requested line */ | |
305 | static inline void zs_rtsdtr(struct dec_serial *info, int which, int set) | |
306 | { | |
307 | unsigned long flags; | |
308 | ||
309 | ||
310 | save_flags(flags); cli(); | |
311 | if (info->zs_channel != info->zs_chan_a) { | |
312 | if (set) { | |
313 | info->zs_chan_a->curregs[5] |= (which & (RTS | DTR)); | |
314 | } else { | |
315 | info->zs_chan_a->curregs[5] &= ~(which & (RTS | DTR)); | |
316 | } | |
317 | write_zsreg(info->zs_chan_a, 5, info->zs_chan_a->curregs[5]); | |
318 | } | |
319 | restore_flags(flags); | |
320 | } | |
321 | ||
322 | /* Utility routines for the Zilog */ | |
323 | static inline int get_zsbaud(struct dec_serial *ss) | |
324 | { | |
325 | struct dec_zschannel *channel = ss->zs_channel; | |
326 | int brg; | |
327 | ||
328 | /* The baud rate is split up between two 8-bit registers in | |
329 | * what is termed 'BRG time constant' format in my docs for | |
330 | * the chip, it is a function of the clk rate the chip is | |
331 | * receiving which happens to be constant. | |
332 | */ | |
333 | brg = (read_zsreg(channel, 13) << 8); | |
334 | brg |= read_zsreg(channel, 12); | |
335 | return BRG_TO_BPS(brg, (zs_parms->clock/(ss->clk_divisor))); | |
336 | } | |
337 | ||
338 | /* On receive, this clears errors and the receiver interrupts */ | |
339 | static inline void rs_recv_clear(struct dec_zschannel *zsc) | |
340 | { | |
341 | write_zsreg(zsc, 0, ERR_RES); | |
342 | write_zsreg(zsc, 0, RES_H_IUS); /* XXX this is unnecessary */ | |
343 | } | |
344 | ||
345 | /* | |
346 | * ---------------------------------------------------------------------- | |
347 | * | |
348 | * Here starts the interrupt handling routines. All of the following | |
349 | * subroutines are declared as inline and are folded into | |
350 | * rs_interrupt(). They were separated out for readability's sake. | |
351 | * | |
352 | * - Ted Ts'o (tytso@mit.edu), 7-Mar-93 | |
353 | * ----------------------------------------------------------------------- | |
354 | */ | |
355 | ||
356 | /* | |
357 | * This routine is used by the interrupt handler to schedule | |
358 | * processing in the software interrupt portion of the driver. | |
359 | */ | |
360 | static _INLINE_ void rs_sched_event(struct dec_serial *info, | |
361 | int event) | |
362 | { | |
363 | info->event |= 1 << event; | |
364 | queue_task(&info->tqueue, &tq_zs_serial); | |
365 | mark_bh(SERIAL_BH); | |
366 | } | |
367 | ||
368 | static _INLINE_ void receive_chars(struct dec_serial *info, | |
369 | struct pt_regs *regs) | |
370 | { | |
371 | struct tty_struct *tty = info->tty; | |
372 | unsigned char ch, stat, flag; | |
373 | ||
374 | while ((read_zsreg(info->zs_channel, R0) & Rx_CH_AV) != 0) { | |
375 | ||
376 | stat = read_zsreg(info->zs_channel, R1); | |
377 | ch = read_zsdata(info->zs_channel); | |
378 | ||
379 | if (!tty && (!info->hook || !info->hook->rx_char)) | |
380 | continue; | |
381 | ||
382 | flag = TTY_NORMAL; | |
383 | if (info->tty_break) { | |
384 | info->tty_break = 0; | |
385 | flag = TTY_BREAK; | |
386 | if (info->flags & ZILOG_SAK) | |
387 | do_SAK(tty); | |
388 | /* Ignore the null char got when BREAK is removed. */ | |
389 | if (ch == 0) | |
390 | continue; | |
391 | } else { | |
392 | if (stat & Rx_OVR) { | |
393 | flag = TTY_OVERRUN; | |
394 | } else if (stat & FRM_ERR) { | |
395 | flag = TTY_FRAME; | |
396 | } else if (stat & PAR_ERR) { | |
397 | flag = TTY_PARITY; | |
398 | } | |
399 | if (flag != TTY_NORMAL) | |
400 | /* reset the error indication */ | |
401 | write_zsreg(info->zs_channel, R0, ERR_RES); | |
402 | } | |
403 | ||
404 | #if defined(CONFIG_SERIAL_DEC_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ) && \ | |
405 | !defined(MODULE) | |
406 | if (break_pressed && info->line == sercons.index) { | |
407 | /* Ignore the null char got when BREAK is removed. */ | |
408 | if (ch == 0) | |
409 | continue; | |
410 | if (time_before(jiffies, break_pressed + HZ * 5)) { | |
411 | handle_sysrq(ch, regs, NULL); | |
412 | break_pressed = 0; | |
413 | continue; | |
414 | } | |
415 | break_pressed = 0; | |
416 | } | |
417 | #endif | |
418 | ||
419 | if (info->hook && info->hook->rx_char) { | |
420 | (*info->hook->rx_char)(ch, flag); | |
421 | return; | |
422 | } | |
423 | ||
424 | tty_insert_flip_char(tty, ch, flag); | |
425 | } | |
426 | if (tty) | |
427 | tty_flip_buffer_push(tty); | |
428 | } | |
429 | ||
430 | static void transmit_chars(struct dec_serial *info) | |
431 | { | |
432 | if ((read_zsreg(info->zs_channel, R0) & Tx_BUF_EMP) == 0) | |
433 | return; | |
434 | info->tx_active = 0; | |
435 | ||
436 | if (info->x_char) { | |
437 | /* Send next char */ | |
438 | write_zsdata(info->zs_channel, info->x_char); | |
439 | info->x_char = 0; | |
440 | info->tx_active = 1; | |
441 | return; | |
442 | } | |
443 | ||
444 | if ((info->xmit_cnt <= 0) || (info->tty && info->tty->stopped) | |
445 | || info->tx_stopped) { | |
446 | write_zsreg(info->zs_channel, R0, RES_Tx_P); | |
447 | return; | |
448 | } | |
449 | /* Send char */ | |
450 | write_zsdata(info->zs_channel, info->xmit_buf[info->xmit_tail++]); | |
451 | info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1); | |
452 | info->xmit_cnt--; | |
453 | info->tx_active = 1; | |
454 | ||
455 | if (info->xmit_cnt < WAKEUP_CHARS) | |
456 | rs_sched_event(info, RS_EVENT_WRITE_WAKEUP); | |
457 | } | |
458 | ||
459 | static _INLINE_ void status_handle(struct dec_serial *info) | |
460 | { | |
461 | unsigned char stat; | |
462 | ||
463 | /* Get status from Read Register 0 */ | |
464 | stat = read_zsreg(info->zs_channel, R0); | |
465 | ||
466 | if ((stat & BRK_ABRT) && !(info->read_reg_zero & BRK_ABRT)) { | |
467 | #if defined(CONFIG_SERIAL_DEC_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ) && \ | |
468 | !defined(MODULE) | |
469 | if (info->line == sercons.index) { | |
470 | if (!break_pressed) | |
471 | break_pressed = jiffies; | |
472 | } else | |
473 | #endif | |
474 | info->tty_break = 1; | |
475 | } | |
476 | ||
477 | if (info->zs_channel != info->zs_chan_a) { | |
478 | ||
479 | /* Check for DCD transitions */ | |
480 | if (info->tty && !C_CLOCAL(info->tty) && | |
481 | ((stat ^ info->read_reg_zero) & DCD) != 0 ) { | |
482 | if (stat & DCD) { | |
483 | wake_up_interruptible(&info->open_wait); | |
484 | } else { | |
485 | tty_hangup(info->tty); | |
486 | } | |
487 | } | |
488 | ||
489 | /* Check for CTS transitions */ | |
490 | if (info->tty && C_CRTSCTS(info->tty)) { | |
491 | if ((stat & CTS) != 0) { | |
492 | if (info->tx_stopped) { | |
493 | info->tx_stopped = 0; | |
494 | if (!info->tx_active) | |
495 | transmit_chars(info); | |
496 | } | |
497 | } else { | |
498 | info->tx_stopped = 1; | |
499 | } | |
500 | } | |
501 | ||
502 | } | |
503 | ||
504 | /* Clear status condition... */ | |
505 | write_zsreg(info->zs_channel, R0, RES_EXT_INT); | |
506 | info->read_reg_zero = stat; | |
507 | } | |
508 | ||
509 | /* | |
510 | * This is the serial driver's generic interrupt routine | |
511 | */ | |
512 | void rs_interrupt(int irq, void *dev_id, struct pt_regs * regs) | |
513 | { | |
514 | struct dec_serial *info = (struct dec_serial *) dev_id; | |
515 | unsigned char zs_intreg; | |
516 | int shift; | |
517 | ||
518 | /* NOTE: The read register 3, which holds the irq status, | |
519 | * does so for both channels on each chip. Although | |
520 | * the status value itself must be read from the A | |
521 | * channel and is only valid when read from channel A. | |
522 | * Yes... broken hardware... | |
523 | */ | |
524 | #define CHAN_IRQMASK (CHBRxIP | CHBTxIP | CHBEXT) | |
525 | ||
526 | if (info->zs_chan_a == info->zs_channel) | |
527 | shift = 3; /* Channel A */ | |
528 | else | |
529 | shift = 0; /* Channel B */ | |
530 | ||
531 | for (;;) { | |
532 | zs_intreg = read_zsreg(info->zs_chan_a, R3) >> shift; | |
533 | if ((zs_intreg & CHAN_IRQMASK) == 0) | |
534 | break; | |
535 | ||
536 | if (zs_intreg & CHBRxIP) { | |
537 | receive_chars(info, regs); | |
538 | } | |
539 | if (zs_intreg & CHBTxIP) { | |
540 | transmit_chars(info); | |
541 | } | |
542 | if (zs_intreg & CHBEXT) { | |
543 | status_handle(info); | |
544 | } | |
545 | } | |
546 | ||
547 | /* Why do we need this ? */ | |
548 | write_zsreg(info->zs_channel, 0, RES_H_IUS); | |
549 | } | |
550 | ||
551 | #ifdef ZS_DEBUG_REGS | |
552 | void zs_dump (void) { | |
553 | int i, j; | |
554 | for (i = 0; i < zs_channels_found; i++) { | |
555 | struct dec_zschannel *ch = &zs_channels[i]; | |
556 | if ((long)ch->control == UNI_IO_BASE+UNI_SCC1A_CTRL) { | |
557 | for (j = 0; j < 15; j++) { | |
558 | printk("W%d = 0x%x\t", | |
559 | j, (int)ch->curregs[j]); | |
560 | } | |
561 | for (j = 0; j < 15; j++) { | |
562 | printk("R%d = 0x%x\t", | |
563 | j, (int)read_zsreg(ch,j)); | |
564 | } | |
565 | printk("\n\n"); | |
566 | } | |
567 | } | |
568 | } | |
569 | #endif | |
570 | ||
571 | /* | |
572 | * ------------------------------------------------------------------- | |
573 | * Here ends the serial interrupt routines. | |
574 | * ------------------------------------------------------------------- | |
575 | */ | |
576 | ||
577 | /* | |
578 | * ------------------------------------------------------------ | |
579 | * rs_stop() and rs_start() | |
580 | * | |
581 | * This routines are called before setting or resetting tty->stopped. | |
582 | * ------------------------------------------------------------ | |
583 | */ | |
584 | static void rs_stop(struct tty_struct *tty) | |
585 | { | |
586 | struct dec_serial *info = (struct dec_serial *)tty->driver_data; | |
587 | unsigned long flags; | |
588 | ||
589 | if (serial_paranoia_check(info, tty->name, "rs_stop")) | |
590 | return; | |
591 | ||
592 | #if 1 | |
593 | save_flags(flags); cli(); | |
594 | if (info->zs_channel->curregs[5] & TxENAB) { | |
595 | info->zs_channel->curregs[5] &= ~TxENAB; | |
596 | write_zsreg(info->zs_channel, 5, info->zs_channel->curregs[5]); | |
597 | } | |
598 | restore_flags(flags); | |
599 | #endif | |
600 | } | |
601 | ||
602 | static void rs_start(struct tty_struct *tty) | |
603 | { | |
604 | struct dec_serial *info = (struct dec_serial *)tty->driver_data; | |
605 | unsigned long flags; | |
606 | ||
607 | if (serial_paranoia_check(info, tty->name, "rs_start")) | |
608 | return; | |
609 | ||
610 | save_flags(flags); cli(); | |
611 | #if 1 | |
612 | if (info->xmit_cnt && info->xmit_buf && !(info->zs_channel->curregs[5] & TxENAB)) { | |
613 | info->zs_channel->curregs[5] |= TxENAB; | |
614 | write_zsreg(info->zs_channel, 5, info->zs_channel->curregs[5]); | |
615 | } | |
616 | #else | |
617 | if (info->xmit_cnt && info->xmit_buf && !info->tx_active) { | |
618 | transmit_chars(info); | |
619 | } | |
620 | #endif | |
621 | restore_flags(flags); | |
622 | } | |
623 | ||
624 | /* | |
625 | * This routine is used to handle the "bottom half" processing for the | |
626 | * serial driver, known also the "software interrupt" processing. | |
627 | * This processing is done at the kernel interrupt level, after the | |
628 | * rs_interrupt() has returned, BUT WITH INTERRUPTS TURNED ON. This | |
629 | * is where time-consuming activities which can not be done in the | |
630 | * interrupt driver proper are done; the interrupt driver schedules | |
631 | * them using rs_sched_event(), and they get done here. | |
632 | */ | |
633 | static void do_serial_bh(void) | |
634 | { | |
635 | run_task_queue(&tq_zs_serial); | |
636 | } | |
637 | ||
638 | static void do_softint(void *private_) | |
639 | { | |
640 | struct dec_serial *info = (struct dec_serial *) private_; | |
641 | struct tty_struct *tty; | |
642 | ||
643 | tty = info->tty; | |
644 | if (!tty) | |
645 | return; | |
646 | ||
647 | if (test_and_clear_bit(RS_EVENT_WRITE_WAKEUP, &info->event)) { | |
648 | tty_wakeup(tty); | |
649 | } | |
650 | } | |
651 | ||
652 | int zs_startup(struct dec_serial * info) | |
653 | { | |
654 | unsigned long flags; | |
655 | ||
656 | if (info->flags & ZILOG_INITIALIZED) | |
657 | return 0; | |
658 | ||
659 | if (!info->xmit_buf) { | |
660 | info->xmit_buf = (unsigned char *) get_zeroed_page(GFP_KERNEL); | |
661 | if (!info->xmit_buf) | |
662 | return -ENOMEM; | |
663 | } | |
664 | ||
665 | save_flags(flags); cli(); | |
666 | ||
667 | #ifdef SERIAL_DEBUG_OPEN | |
668 | printk("starting up ttyS%d (irq %d)...", info->line, info->irq); | |
669 | #endif | |
670 | ||
671 | /* | |
672 | * Clear the receive FIFO. | |
673 | */ | |
674 | ZS_CLEARFIFO(info->zs_channel); | |
675 | info->xmit_fifo_size = 1; | |
676 | ||
677 | /* | |
678 | * Clear the interrupt registers. | |
679 | */ | |
680 | write_zsreg(info->zs_channel, R0, ERR_RES); | |
681 | write_zsreg(info->zs_channel, R0, RES_H_IUS); | |
682 | ||
683 | /* | |
684 | * Set the speed of the serial port | |
685 | */ | |
686 | change_speed(info); | |
687 | ||
688 | /* | |
689 | * Turn on RTS and DTR. | |
690 | */ | |
691 | zs_rtsdtr(info, RTS | DTR, 1); | |
692 | ||
693 | /* | |
694 | * Finally, enable sequencing and interrupts | |
695 | */ | |
696 | info->zs_channel->curregs[R1] &= ~RxINT_MASK; | |
697 | info->zs_channel->curregs[R1] |= (RxINT_ALL | TxINT_ENAB | | |
698 | EXT_INT_ENAB); | |
699 | info->zs_channel->curregs[R3] |= RxENABLE; | |
700 | info->zs_channel->curregs[R5] |= TxENAB; | |
701 | info->zs_channel->curregs[R15] |= (DCDIE | CTSIE | TxUIE | BRKIE); | |
702 | write_zsreg(info->zs_channel, R1, info->zs_channel->curregs[R1]); | |
703 | write_zsreg(info->zs_channel, R3, info->zs_channel->curregs[R3]); | |
704 | write_zsreg(info->zs_channel, R5, info->zs_channel->curregs[R5]); | |
705 | write_zsreg(info->zs_channel, R15, info->zs_channel->curregs[R15]); | |
706 | ||
707 | /* | |
708 | * And clear the interrupt registers again for luck. | |
709 | */ | |
710 | write_zsreg(info->zs_channel, R0, ERR_RES); | |
711 | write_zsreg(info->zs_channel, R0, RES_H_IUS); | |
712 | ||
713 | /* Save the current value of RR0 */ | |
714 | info->read_reg_zero = read_zsreg(info->zs_channel, R0); | |
715 | ||
716 | if (info->tty) | |
717 | clear_bit(TTY_IO_ERROR, &info->tty->flags); | |
718 | info->xmit_cnt = info->xmit_head = info->xmit_tail = 0; | |
719 | ||
720 | info->flags |= ZILOG_INITIALIZED; | |
721 | restore_flags(flags); | |
722 | return 0; | |
723 | } | |
724 | ||
725 | /* | |
726 | * This routine will shutdown a serial port; interrupts are disabled, and | |
727 | * DTR is dropped if the hangup on close termio flag is on. | |
728 | */ | |
729 | static void shutdown(struct dec_serial * info) | |
730 | { | |
731 | unsigned long flags; | |
732 | ||
733 | if (!(info->flags & ZILOG_INITIALIZED)) | |
734 | return; | |
735 | ||
736 | #ifdef SERIAL_DEBUG_OPEN | |
737 | printk("Shutting down serial port %d (irq %d)....", info->line, | |
738 | info->irq); | |
739 | #endif | |
740 | ||
741 | save_flags(flags); cli(); /* Disable interrupts */ | |
742 | ||
743 | if (info->xmit_buf) { | |
744 | free_page((unsigned long) info->xmit_buf); | |
745 | info->xmit_buf = 0; | |
746 | } | |
747 | ||
748 | info->zs_channel->curregs[1] = 0; | |
749 | write_zsreg(info->zs_channel, 1, info->zs_channel->curregs[1]); /* no interrupts */ | |
750 | ||
751 | info->zs_channel->curregs[3] &= ~RxENABLE; | |
752 | write_zsreg(info->zs_channel, 3, info->zs_channel->curregs[3]); | |
753 | ||
754 | info->zs_channel->curregs[5] &= ~TxENAB; | |
755 | write_zsreg(info->zs_channel, 5, info->zs_channel->curregs[5]); | |
756 | if (!info->tty || C_HUPCL(info->tty)) { | |
757 | zs_rtsdtr(info, RTS | DTR, 0); | |
758 | } | |
759 | ||
760 | if (info->tty) | |
761 | set_bit(TTY_IO_ERROR, &info->tty->flags); | |
762 | ||
763 | info->flags &= ~ZILOG_INITIALIZED; | |
764 | restore_flags(flags); | |
765 | } | |
766 | ||
767 | /* | |
768 | * This routine is called to set the UART divisor registers to match | |
769 | * the specified baud rate for a serial port. | |
770 | */ | |
771 | static void change_speed(struct dec_serial *info) | |
772 | { | |
773 | unsigned cflag; | |
774 | int i; | |
775 | int brg, bits; | |
776 | unsigned long flags; | |
777 | ||
778 | if (!info->hook) { | |
779 | if (!info->tty || !info->tty->termios) | |
780 | return; | |
781 | cflag = info->tty->termios->c_cflag; | |
782 | if (!info->port) | |
783 | return; | |
784 | } else { | |
785 | cflag = info->hook->cflags; | |
786 | } | |
787 | ||
788 | i = cflag & CBAUD; | |
789 | if (i & CBAUDEX) { | |
790 | i &= ~CBAUDEX; | |
791 | if (i < 1 || i > 2) { | |
792 | if (!info->hook) | |
793 | info->tty->termios->c_cflag &= ~CBAUDEX; | |
794 | else | |
795 | info->hook->cflags &= ~CBAUDEX; | |
796 | } else | |
797 | i += 15; | |
798 | } | |
799 | ||
800 | save_flags(flags); cli(); | |
801 | info->zs_baud = baud_table[i]; | |
802 | if (info->zs_baud) { | |
803 | brg = BPS_TO_BRG(info->zs_baud, zs_parms->clock/info->clk_divisor); | |
804 | info->zs_channel->curregs[12] = (brg & 255); | |
805 | info->zs_channel->curregs[13] = ((brg >> 8) & 255); | |
806 | zs_rtsdtr(info, DTR, 1); | |
807 | } else { | |
808 | zs_rtsdtr(info, RTS | DTR, 0); | |
809 | return; | |
810 | } | |
811 | ||
812 | /* byte size and parity */ | |
813 | info->zs_channel->curregs[3] &= ~RxNBITS_MASK; | |
814 | info->zs_channel->curregs[5] &= ~TxNBITS_MASK; | |
815 | switch (cflag & CSIZE) { | |
816 | case CS5: | |
817 | bits = 7; | |
818 | info->zs_channel->curregs[3] |= Rx5; | |
819 | info->zs_channel->curregs[5] |= Tx5; | |
820 | break; | |
821 | case CS6: | |
822 | bits = 8; | |
823 | info->zs_channel->curregs[3] |= Rx6; | |
824 | info->zs_channel->curregs[5] |= Tx6; | |
825 | break; | |
826 | case CS7: | |
827 | bits = 9; | |
828 | info->zs_channel->curregs[3] |= Rx7; | |
829 | info->zs_channel->curregs[5] |= Tx7; | |
830 | break; | |
831 | case CS8: | |
832 | default: /* defaults to 8 bits */ | |
833 | bits = 10; | |
834 | info->zs_channel->curregs[3] |= Rx8; | |
835 | info->zs_channel->curregs[5] |= Tx8; | |
836 | break; | |
837 | } | |
838 | ||
839 | info->timeout = ((info->xmit_fifo_size*HZ*bits) / info->zs_baud); | |
840 | info->timeout += HZ/50; /* Add .02 seconds of slop */ | |
841 | ||
842 | info->zs_channel->curregs[4] &= ~(SB_MASK | PAR_ENA | PAR_EVEN); | |
843 | if (cflag & CSTOPB) { | |
844 | info->zs_channel->curregs[4] |= SB2; | |
845 | } else { | |
846 | info->zs_channel->curregs[4] |= SB1; | |
847 | } | |
848 | if (cflag & PARENB) { | |
849 | info->zs_channel->curregs[4] |= PAR_ENA; | |
850 | } | |
851 | if (!(cflag & PARODD)) { | |
852 | info->zs_channel->curregs[4] |= PAR_EVEN; | |
853 | } | |
854 | ||
855 | if (!(cflag & CLOCAL)) { | |
856 | if (!(info->zs_channel->curregs[15] & DCDIE)) | |
857 | info->read_reg_zero = read_zsreg(info->zs_channel, 0); | |
858 | info->zs_channel->curregs[15] |= DCDIE; | |
859 | } else | |
860 | info->zs_channel->curregs[15] &= ~DCDIE; | |
861 | if (cflag & CRTSCTS) { | |
862 | info->zs_channel->curregs[15] |= CTSIE; | |
863 | if ((read_zsreg(info->zs_channel, 0) & CTS) == 0) | |
864 | info->tx_stopped = 1; | |
865 | } else { | |
866 | info->zs_channel->curregs[15] &= ~CTSIE; | |
867 | info->tx_stopped = 0; | |
868 | } | |
869 | ||
870 | /* Load up the new values */ | |
871 | load_zsregs(info->zs_channel, info->zs_channel->curregs); | |
872 | ||
873 | restore_flags(flags); | |
874 | } | |
875 | ||
876 | static void rs_flush_chars(struct tty_struct *tty) | |
877 | { | |
878 | struct dec_serial *info = (struct dec_serial *)tty->driver_data; | |
879 | unsigned long flags; | |
880 | ||
881 | if (serial_paranoia_check(info, tty->name, "rs_flush_chars")) | |
882 | return; | |
883 | ||
884 | if (info->xmit_cnt <= 0 || tty->stopped || info->tx_stopped || | |
885 | !info->xmit_buf) | |
886 | return; | |
887 | ||
888 | /* Enable transmitter */ | |
889 | save_flags(flags); cli(); | |
890 | transmit_chars(info); | |
891 | restore_flags(flags); | |
892 | } | |
893 | ||
894 | static int rs_write(struct tty_struct * tty, | |
895 | const unsigned char *buf, int count) | |
896 | { | |
897 | int c, total = 0; | |
898 | struct dec_serial *info = (struct dec_serial *)tty->driver_data; | |
899 | unsigned long flags; | |
900 | ||
901 | if (serial_paranoia_check(info, tty->name, "rs_write")) | |
902 | return 0; | |
903 | ||
904 | if (!tty || !info->xmit_buf) | |
905 | return 0; | |
906 | ||
907 | save_flags(flags); | |
908 | while (1) { | |
909 | cli(); | |
910 | c = min(count, min(SERIAL_XMIT_SIZE - info->xmit_cnt - 1, | |
911 | SERIAL_XMIT_SIZE - info->xmit_head)); | |
912 | if (c <= 0) | |
913 | break; | |
914 | ||
915 | if (from_user) { | |
916 | down(&tmp_buf_sem); | |
917 | copy_from_user(tmp_buf, buf, c); | |
918 | c = min(c, min(SERIAL_XMIT_SIZE - info->xmit_cnt - 1, | |
919 | SERIAL_XMIT_SIZE - info->xmit_head)); | |
920 | memcpy(info->xmit_buf + info->xmit_head, tmp_buf, c); | |
921 | up(&tmp_buf_sem); | |
922 | } else | |
923 | memcpy(info->xmit_buf + info->xmit_head, buf, c); | |
924 | info->xmit_head = (info->xmit_head + c) & (SERIAL_XMIT_SIZE-1); | |
925 | info->xmit_cnt += c; | |
926 | restore_flags(flags); | |
927 | buf += c; | |
928 | count -= c; | |
929 | total += c; | |
930 | } | |
931 | ||
932 | if (info->xmit_cnt && !tty->stopped && !info->tx_stopped | |
933 | && !info->tx_active) | |
934 | transmit_chars(info); | |
935 | restore_flags(flags); | |
936 | return total; | |
937 | } | |
938 | ||
939 | static int rs_write_room(struct tty_struct *tty) | |
940 | { | |
941 | struct dec_serial *info = (struct dec_serial *)tty->driver_data; | |
942 | int ret; | |
943 | ||
944 | if (serial_paranoia_check(info, tty->name, "rs_write_room")) | |
945 | return 0; | |
946 | ret = SERIAL_XMIT_SIZE - info->xmit_cnt - 1; | |
947 | if (ret < 0) | |
948 | ret = 0; | |
949 | return ret; | |
950 | } | |
951 | ||
952 | static int rs_chars_in_buffer(struct tty_struct *tty) | |
953 | { | |
954 | struct dec_serial *info = (struct dec_serial *)tty->driver_data; | |
955 | ||
956 | if (serial_paranoia_check(info, tty->name, "rs_chars_in_buffer")) | |
957 | return 0; | |
958 | return info->xmit_cnt; | |
959 | } | |
960 | ||
961 | static void rs_flush_buffer(struct tty_struct *tty) | |
962 | { | |
963 | struct dec_serial *info = (struct dec_serial *)tty->driver_data; | |
964 | ||
965 | if (serial_paranoia_check(info, tty->name, "rs_flush_buffer")) | |
966 | return; | |
967 | cli(); | |
968 | info->xmit_cnt = info->xmit_head = info->xmit_tail = 0; | |
969 | sti(); | |
970 | tty_wakeup(tty); | |
971 | } | |
972 | ||
973 | /* | |
974 | * ------------------------------------------------------------ | |
975 | * rs_throttle() | |
976 | * | |
977 | * This routine is called by the upper-layer tty layer to signal that | |
978 | * incoming characters should be throttled. | |
979 | * ------------------------------------------------------------ | |
980 | */ | |
981 | static void rs_throttle(struct tty_struct * tty) | |
982 | { | |
983 | struct dec_serial *info = (struct dec_serial *)tty->driver_data; | |
984 | unsigned long flags; | |
985 | ||
986 | #ifdef SERIAL_DEBUG_THROTTLE | |
987 | char buf[64]; | |
988 | ||
989 | printk("throttle %s: %d....\n", _tty_name(tty, buf), | |
990 | tty->ldisc.chars_in_buffer(tty)); | |
991 | #endif | |
992 | ||
993 | if (serial_paranoia_check(info, tty->name, "rs_throttle")) | |
994 | return; | |
995 | ||
996 | if (I_IXOFF(tty)) { | |
997 | save_flags(flags); cli(); | |
998 | info->x_char = STOP_CHAR(tty); | |
999 | if (!info->tx_active) | |
1000 | transmit_chars(info); | |
1001 | restore_flags(flags); | |
1002 | } | |
1003 | ||
1004 | if (C_CRTSCTS(tty)) { | |
1005 | zs_rtsdtr(info, RTS, 0); | |
1006 | } | |
1007 | } | |
1008 | ||
1009 | static void rs_unthrottle(struct tty_struct * tty) | |
1010 | { | |
1011 | struct dec_serial *info = (struct dec_serial *)tty->driver_data; | |
1012 | unsigned long flags; | |
1013 | ||
1014 | #ifdef SERIAL_DEBUG_THROTTLE | |
1015 | char buf[64]; | |
1016 | ||
1017 | printk("unthrottle %s: %d....\n", _tty_name(tty, buf), | |
1018 | tty->ldisc.chars_in_buffer(tty)); | |
1019 | #endif | |
1020 | ||
1021 | if (serial_paranoia_check(info, tty->name, "rs_unthrottle")) | |
1022 | return; | |
1023 | ||
1024 | if (I_IXOFF(tty)) { | |
1025 | save_flags(flags); cli(); | |
1026 | if (info->x_char) | |
1027 | info->x_char = 0; | |
1028 | else { | |
1029 | info->x_char = START_CHAR(tty); | |
1030 | if (!info->tx_active) | |
1031 | transmit_chars(info); | |
1032 | } | |
1033 | restore_flags(flags); | |
1034 | } | |
1035 | ||
1036 | if (C_CRTSCTS(tty)) { | |
1037 | zs_rtsdtr(info, RTS, 1); | |
1038 | } | |
1039 | } | |
1040 | ||
1041 | /* | |
1042 | * ------------------------------------------------------------ | |
1043 | * rs_ioctl() and friends | |
1044 | * ------------------------------------------------------------ | |
1045 | */ | |
1046 | ||
1047 | static int get_serial_info(struct dec_serial * info, | |
1048 | struct serial_struct * retinfo) | |
1049 | { | |
1050 | struct serial_struct tmp; | |
1051 | ||
1052 | if (!retinfo) | |
1053 | return -EFAULT; | |
1054 | memset(&tmp, 0, sizeof(tmp)); | |
1055 | tmp.type = info->type; | |
1056 | tmp.line = info->line; | |
1057 | tmp.port = info->port; | |
1058 | tmp.irq = info->irq; | |
1059 | tmp.flags = info->flags; | |
1060 | tmp.baud_base = info->baud_base; | |
1061 | tmp.close_delay = info->close_delay; | |
1062 | tmp.closing_wait = info->closing_wait; | |
1063 | tmp.custom_divisor = info->custom_divisor; | |
1064 | return copy_to_user(retinfo,&tmp,sizeof(*retinfo)) ? -EFAULT : 0; | |
1065 | } | |
1066 | ||
1067 | static int set_serial_info(struct dec_serial * info, | |
1068 | struct serial_struct * new_info) | |
1069 | { | |
1070 | struct serial_struct new_serial; | |
1071 | struct dec_serial old_info; | |
1072 | int retval = 0; | |
1073 | ||
1074 | if (!new_info) | |
1075 | return -EFAULT; | |
1076 | copy_from_user(&new_serial,new_info,sizeof(new_serial)); | |
1077 | old_info = *info; | |
1078 | ||
1079 | if (!capable(CAP_SYS_ADMIN)) { | |
1080 | if ((new_serial.baud_base != info->baud_base) || | |
1081 | (new_serial.type != info->type) || | |
1082 | (new_serial.close_delay != info->close_delay) || | |
1083 | ((new_serial.flags & ~ZILOG_USR_MASK) != | |
1084 | (info->flags & ~ZILOG_USR_MASK))) | |
1085 | return -EPERM; | |
1086 | info->flags = ((info->flags & ~ZILOG_USR_MASK) | | |
1087 | (new_serial.flags & ZILOG_USR_MASK)); | |
1088 | info->custom_divisor = new_serial.custom_divisor; | |
1089 | goto check_and_exit; | |
1090 | } | |
1091 | ||
1092 | if (info->count > 1) | |
1093 | return -EBUSY; | |
1094 | ||
1095 | /* | |
1096 | * OK, past this point, all the error checking has been done. | |
1097 | * At this point, we start making changes..... | |
1098 | */ | |
1099 | ||
1100 | info->baud_base = new_serial.baud_base; | |
1101 | info->flags = ((info->flags & ~ZILOG_FLAGS) | | |
1102 | (new_serial.flags & ZILOG_FLAGS)); | |
1103 | info->type = new_serial.type; | |
1104 | info->close_delay = new_serial.close_delay; | |
1105 | info->closing_wait = new_serial.closing_wait; | |
1106 | ||
1107 | check_and_exit: | |
1108 | retval = zs_startup(info); | |
1109 | return retval; | |
1110 | } | |
1111 | ||
1112 | /* | |
1113 | * get_lsr_info - get line status register info | |
1114 | * | |
1115 | * Purpose: Let user call ioctl() to get info when the UART physically | |
1116 | * is emptied. On bus types like RS485, the transmitter must | |
1117 | * release the bus after transmitting. This must be done when | |
1118 | * the transmit shift register is empty, not be done when the | |
1119 | * transmit holding register is empty. This functionality | |
1120 | * allows an RS485 driver to be written in user space. | |
1121 | */ | |
1122 | static int get_lsr_info(struct dec_serial * info, unsigned int *value) | |
1123 | { | |
1124 | unsigned char status; | |
1125 | ||
1126 | cli(); | |
1127 | status = read_zsreg(info->zs_channel, 0); | |
1128 | sti(); | |
1129 | put_user(status,value); | |
1130 | return 0; | |
1131 | } | |
1132 | ||
1133 | static int rs_tiocmget(struct tty_struct *tty, struct file *file) | |
1134 | { | |
1135 | struct dec_serial * info = (struct dec_serial *)tty->driver_data; | |
1136 | unsigned char control, status_a, status_b; | |
1137 | unsigned int result; | |
1138 | ||
1139 | if (info->hook) | |
1140 | return -ENODEV; | |
1141 | ||
1142 | if (serial_paranoia_check(info, tty->name, __FUNCTION__)) | |
1143 | return -ENODEV; | |
1144 | ||
1145 | if (tty->flags & (1 << TTY_IO_ERROR)) | |
1146 | return -EIO; | |
1147 | ||
1148 | if (info->zs_channel == info->zs_chan_a) | |
1149 | result = 0; | |
1150 | else { | |
1151 | cli(); | |
1152 | control = info->zs_chan_a->curregs[5]; | |
1153 | status_a = read_zsreg(info->zs_chan_a, 0); | |
1154 | status_b = read_zsreg(info->zs_channel, 0); | |
1155 | sti(); | |
1156 | result = ((control & RTS) ? TIOCM_RTS: 0) | |
1157 | | ((control & DTR) ? TIOCM_DTR: 0) | |
1158 | | ((status_b & DCD) ? TIOCM_CAR: 0) | |
1159 | | ((status_a & DCD) ? TIOCM_RNG: 0) | |
1160 | | ((status_a & SYNC_HUNT) ? TIOCM_DSR: 0) | |
1161 | | ((status_b & CTS) ? TIOCM_CTS: 0); | |
1162 | } | |
1163 | return result; | |
1164 | } | |
1165 | ||
1166 | static int rs_tiocmset(struct tty_struct *tty, struct file *file, | |
1167 | unsigned int set, unsigned int clear) | |
1168 | { | |
1169 | struct dec_serial * info = (struct dec_serial *)tty->driver_data; | |
1170 | int error; | |
1171 | unsigned int arg, bits; | |
1172 | ||
1173 | if (info->hook) | |
1174 | return -ENODEV; | |
1175 | ||
1176 | if (serial_paranoia_check(info, tty->name, __FUNCTION__)) | |
1177 | return -ENODEV; | |
1178 | ||
1179 | if (tty->flags & (1 << TTY_IO_ERROR)) | |
1180 | return -EIO; | |
1181 | ||
1182 | if (info->zs_channel == info->zs_chan_a) | |
1183 | return 0; | |
1184 | ||
1185 | get_user(arg, value); | |
1186 | cli(); | |
1187 | if (set & TIOCM_RTS) | |
1188 | info->zs_chan_a->curregs[5] |= RTS; | |
1189 | if (set & TIOCM_DTR) | |
1190 | info->zs_chan_a->curregs[5] |= DTR; | |
1191 | if (clear & TIOCM_RTS) | |
1192 | info->zs_chan_a->curregs[5] &= ~RTS; | |
1193 | if (clear & TIOCM_DTR) | |
1194 | info->zs_chan_a->curregs[5] &= ~DTR; | |
1195 | write_zsreg(info->zs_chan_a, 5, info->zs_chan_a->curregs[5]); | |
1196 | sti(); | |
1197 | return 0; | |
1198 | } | |
1199 | ||
1200 | /* | |
1201 | * rs_break - turn transmit break condition on/off | |
1202 | */ | |
1203 | static void rs_break(struct tty_struct *tty, int break_state) | |
1204 | { | |
1205 | struct dec_serial *info = (struct dec_serial *) tty->driver_data; | |
1206 | unsigned long flags; | |
1207 | ||
1208 | if (serial_paranoia_check(info, tty->name, "rs_break")) | |
1209 | return; | |
1210 | if (!info->port) | |
1211 | return; | |
1212 | ||
1213 | save_flags(flags); cli(); | |
1214 | if (break_state == -1) | |
1215 | info->zs_channel->curregs[5] |= SND_BRK; | |
1216 | else | |
1217 | info->zs_channel->curregs[5] &= ~SND_BRK; | |
1218 | write_zsreg(info->zs_channel, 5, info->zs_channel->curregs[5]); | |
1219 | restore_flags(flags); | |
1220 | } | |
1221 | ||
1222 | static int rs_ioctl(struct tty_struct *tty, struct file * file, | |
1223 | unsigned int cmd, unsigned long arg) | |
1224 | { | |
1225 | int error; | |
1226 | struct dec_serial * info = (struct dec_serial *)tty->driver_data; | |
1227 | ||
1228 | if (info->hook) | |
1229 | return -ENODEV; | |
1230 | ||
1231 | if (serial_paranoia_check(info, tty->name, "rs_ioctl")) | |
1232 | return -ENODEV; | |
1233 | ||
1234 | if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) && | |
1235 | (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGWILD) && | |
1236 | (cmd != TIOCSERSWILD) && (cmd != TIOCSERGSTRUCT)) { | |
1237 | if (tty->flags & (1 << TTY_IO_ERROR)) | |
1238 | return -EIO; | |
1239 | } | |
1240 | ||
1241 | switch (cmd) { | |
1242 | case TIOCGSERIAL: | |
1243 | if (!access_ok(VERIFY_WRITE, (void *)arg, | |
1244 | sizeof(struct serial_struct))) | |
1245 | return -EFAULT; | |
1246 | return get_serial_info(info, (struct serial_struct *)arg); | |
1247 | ||
1248 | case TIOCSSERIAL: | |
1249 | return set_serial_info(info, (struct serial_struct *)arg); | |
1250 | ||
1251 | case TIOCSERGETLSR: /* Get line status register */ | |
1252 | if (!access_ok(VERIFY_WRITE, (void *)arg, | |
1253 | sizeof(unsigned int))) | |
1254 | return -EFAULT; | |
1255 | return get_lsr_info(info, (unsigned int *)arg); | |
1256 | ||
1257 | case TIOCSERGSTRUCT: | |
1258 | if (!access_ok(VERIFY_WRITE, (void *)arg, | |
1259 | sizeof(struct dec_serial))) | |
1260 | return -EFAULT; | |
1261 | copy_from_user((struct dec_serial *)arg, info, | |
1262 | sizeof(struct dec_serial)); | |
1263 | return 0; | |
1264 | ||
1265 | default: | |
1266 | return -ENOIOCTLCMD; | |
1267 | } | |
1268 | return 0; | |
1269 | } | |
1270 | ||
1271 | static void rs_set_termios(struct tty_struct *tty, struct termios *old_termios) | |
1272 | { | |
1273 | struct dec_serial *info = (struct dec_serial *)tty->driver_data; | |
1274 | int was_stopped; | |
1275 | ||
1276 | if (tty->termios->c_cflag == old_termios->c_cflag) | |
1277 | return; | |
1278 | was_stopped = info->tx_stopped; | |
1279 | ||
1280 | change_speed(info); | |
1281 | ||
1282 | if (was_stopped && !info->tx_stopped) | |
1283 | rs_start(tty); | |
1284 | } | |
1285 | ||
1286 | /* | |
1287 | * ------------------------------------------------------------ | |
1288 | * rs_close() | |
1289 | * | |
1290 | * This routine is called when the serial port gets closed. | |
1291 | * Wait for the last remaining data to be sent. | |
1292 | * ------------------------------------------------------------ | |
1293 | */ | |
1294 | static void rs_close(struct tty_struct *tty, struct file * filp) | |
1295 | { | |
1296 | struct dec_serial * info = (struct dec_serial *)tty->driver_data; | |
1297 | unsigned long flags; | |
1298 | ||
1299 | if (!info || serial_paranoia_check(info, tty->name, "rs_close")) | |
1300 | return; | |
1301 | ||
1302 | save_flags(flags); cli(); | |
1303 | ||
1304 | if (tty_hung_up_p(filp)) { | |
1305 | restore_flags(flags); | |
1306 | return; | |
1307 | } | |
1308 | ||
1309 | #ifdef SERIAL_DEBUG_OPEN | |
1310 | printk("rs_close ttyS%d, count = %d\n", info->line, info->count); | |
1311 | #endif | |
1312 | if ((tty->count == 1) && (info->count != 1)) { | |
1313 | /* | |
1314 | * Uh, oh. tty->count is 1, which means that the tty | |
1315 | * structure will be freed. Info->count should always | |
1316 | * be one in these conditions. If it's greater than | |
1317 | * one, we've got real problems, since it means the | |
1318 | * serial port won't be shutdown. | |
1319 | */ | |
1320 | printk("rs_close: bad serial port count; tty->count is 1, " | |
1321 | "info->count is %d\n", info->count); | |
1322 | info->count = 1; | |
1323 | } | |
1324 | if (--info->count < 0) { | |
1325 | printk("rs_close: bad serial port count for ttyS%d: %d\n", | |
1326 | info->line, info->count); | |
1327 | info->count = 0; | |
1328 | } | |
1329 | if (info->count) { | |
1330 | restore_flags(flags); | |
1331 | return; | |
1332 | } | |
1333 | info->flags |= ZILOG_CLOSING; | |
1334 | /* | |
1335 | * Now we wait for the transmit buffer to clear; and we notify | |
1336 | * the line discipline to only process XON/XOFF characters. | |
1337 | */ | |
1338 | tty->closing = 1; | |
1339 | if (info->closing_wait != ZILOG_CLOSING_WAIT_NONE) | |
1340 | tty_wait_until_sent(tty, info->closing_wait); | |
1341 | /* | |
1342 | * At this point we stop accepting input. To do this, we | |
1343 | * disable the receiver and receive interrupts. | |
1344 | */ | |
1345 | info->zs_channel->curregs[3] &= ~RxENABLE; | |
1346 | write_zsreg(info->zs_channel, 3, info->zs_channel->curregs[3]); | |
1347 | info->zs_channel->curregs[1] = 0; /* disable any rx ints */ | |
1348 | write_zsreg(info->zs_channel, 1, info->zs_channel->curregs[1]); | |
1349 | ZS_CLEARFIFO(info->zs_channel); | |
1350 | if (info->flags & ZILOG_INITIALIZED) { | |
1351 | /* | |
1352 | * Before we drop DTR, make sure the SCC transmitter | |
1353 | * has completely drained. | |
1354 | */ | |
1355 | rs_wait_until_sent(tty, info->timeout); | |
1356 | } | |
1357 | ||
1358 | shutdown(info); | |
1359 | if (tty->driver->flush_buffer) | |
1360 | tty->driver->flush_buffer(tty); | |
1361 | tty_ldisc_flush(tty); | |
1362 | tty->closing = 0; | |
1363 | info->event = 0; | |
1364 | info->tty = 0; | |
1365 | if (info->blocked_open) { | |
1366 | if (info->close_delay) { | |
1367 | msleep_interruptible(jiffies_to_msecs(info->close_delay)); | |
1368 | } | |
1369 | wake_up_interruptible(&info->open_wait); | |
1370 | } | |
1371 | info->flags &= ~(ZILOG_NORMAL_ACTIVE|ZILOG_CLOSING); | |
1372 | wake_up_interruptible(&info->close_wait); | |
1373 | restore_flags(flags); | |
1374 | } | |
1375 | ||
1376 | /* | |
1377 | * rs_wait_until_sent() --- wait until the transmitter is empty | |
1378 | */ | |
1379 | static void rs_wait_until_sent(struct tty_struct *tty, int timeout) | |
1380 | { | |
1381 | struct dec_serial *info = (struct dec_serial *) tty->driver_data; | |
1382 | unsigned long orig_jiffies; | |
1383 | int char_time; | |
1384 | ||
1385 | if (serial_paranoia_check(info, tty->name, "rs_wait_until_sent")) | |
1386 | return; | |
1387 | ||
1388 | orig_jiffies = jiffies; | |
1389 | /* | |
1390 | * Set the check interval to be 1/5 of the estimated time to | |
1391 | * send a single character, and make it at least 1. The check | |
1392 | * interval should also be less than the timeout. | |
1393 | */ | |
1394 | char_time = (info->timeout - HZ/50) / info->xmit_fifo_size; | |
1395 | char_time = char_time / 5; | |
1396 | if (char_time == 0) | |
1397 | char_time = 1; | |
1398 | if (timeout) | |
1399 | char_time = min(char_time, timeout); | |
1400 | while ((read_zsreg(info->zs_channel, 1) & Tx_BUF_EMP) == 0) { | |
1401 | msleep_interruptible(jiffies_to_msecs(char_time)); | |
1402 | if (signal_pending(current)) | |
1403 | break; | |
1404 | if (timeout && time_after(jiffies, orig_jiffies + timeout)) | |
1405 | break; | |
1406 | } | |
1407 | current->state = TASK_RUNNING; | |
1408 | } | |
1409 | ||
1410 | /* | |
1411 | * rs_hangup() --- called by tty_hangup() when a hangup is signaled. | |
1412 | */ | |
1413 | void rs_hangup(struct tty_struct *tty) | |
1414 | { | |
1415 | struct dec_serial * info = (struct dec_serial *)tty->driver_data; | |
1416 | ||
1417 | if (serial_paranoia_check(info, tty->name, "rs_hangup")) | |
1418 | return; | |
1419 | ||
1420 | rs_flush_buffer(tty); | |
1421 | shutdown(info); | |
1422 | info->event = 0; | |
1423 | info->count = 0; | |
1424 | info->flags &= ~ZILOG_NORMAL_ACTIVE; | |
1425 | info->tty = 0; | |
1426 | wake_up_interruptible(&info->open_wait); | |
1427 | } | |
1428 | ||
1429 | /* | |
1430 | * ------------------------------------------------------------ | |
1431 | * rs_open() and friends | |
1432 | * ------------------------------------------------------------ | |
1433 | */ | |
1434 | static int block_til_ready(struct tty_struct *tty, struct file * filp, | |
1435 | struct dec_serial *info) | |
1436 | { | |
1437 | DECLARE_WAITQUEUE(wait, current); | |
1438 | int retval; | |
1439 | int do_clocal = 0; | |
1440 | ||
1441 | /* | |
1442 | * If the device is in the middle of being closed, then block | |
1443 | * until it's done, and then try again. | |
1444 | */ | |
1445 | if (info->flags & ZILOG_CLOSING) { | |
1446 | interruptible_sleep_on(&info->close_wait); | |
1447 | #ifdef SERIAL_DO_RESTART | |
1448 | return ((info->flags & ZILOG_HUP_NOTIFY) ? | |
1449 | -EAGAIN : -ERESTARTSYS); | |
1450 | #else | |
1451 | return -EAGAIN; | |
1452 | #endif | |
1453 | } | |
1454 | ||
1455 | /* | |
1456 | * If non-blocking mode is set, or the port is not enabled, | |
1457 | * then make the check up front and then exit. | |
1458 | */ | |
1459 | if ((filp->f_flags & O_NONBLOCK) || | |
1460 | (tty->flags & (1 << TTY_IO_ERROR))) { | |
1461 | info->flags |= ZILOG_NORMAL_ACTIVE; | |
1462 | return 0; | |
1463 | } | |
1464 | ||
1465 | if (tty->termios->c_cflag & CLOCAL) | |
1466 | do_clocal = 1; | |
1467 | ||
1468 | /* | |
1469 | * Block waiting for the carrier detect and the line to become | |
1470 | * free (i.e., not in use by the callout). While we are in | |
1471 | * this loop, info->count is dropped by one, so that | |
1472 | * rs_close() knows when to free things. We restore it upon | |
1473 | * exit, either normal or abnormal. | |
1474 | */ | |
1475 | retval = 0; | |
1476 | add_wait_queue(&info->open_wait, &wait); | |
1477 | #ifdef SERIAL_DEBUG_OPEN | |
1478 | printk("block_til_ready before block: ttyS%d, count = %d\n", | |
1479 | info->line, info->count); | |
1480 | #endif | |
1481 | cli(); | |
1482 | if (!tty_hung_up_p(filp)) | |
1483 | info->count--; | |
1484 | sti(); | |
1485 | info->blocked_open++; | |
1486 | while (1) { | |
1487 | cli(); | |
1488 | if (tty->termios->c_cflag & CBAUD) | |
1489 | zs_rtsdtr(info, RTS | DTR, 1); | |
1490 | sti(); | |
1491 | set_current_state(TASK_INTERRUPTIBLE); | |
1492 | if (tty_hung_up_p(filp) || | |
1493 | !(info->flags & ZILOG_INITIALIZED)) { | |
1494 | #ifdef SERIAL_DO_RESTART | |
1495 | if (info->flags & ZILOG_HUP_NOTIFY) | |
1496 | retval = -EAGAIN; | |
1497 | else | |
1498 | retval = -ERESTARTSYS; | |
1499 | #else | |
1500 | retval = -EAGAIN; | |
1501 | #endif | |
1502 | break; | |
1503 | } | |
1504 | if (!(info->flags & ZILOG_CLOSING) && | |
1505 | (do_clocal || (read_zsreg(info->zs_channel, 0) & DCD))) | |
1506 | break; | |
1507 | if (signal_pending(current)) { | |
1508 | retval = -ERESTARTSYS; | |
1509 | break; | |
1510 | } | |
1511 | #ifdef SERIAL_DEBUG_OPEN | |
1512 | printk("block_til_ready blocking: ttyS%d, count = %d\n", | |
1513 | info->line, info->count); | |
1514 | #endif | |
1515 | schedule(); | |
1516 | } | |
1517 | current->state = TASK_RUNNING; | |
1518 | remove_wait_queue(&info->open_wait, &wait); | |
1519 | if (!tty_hung_up_p(filp)) | |
1520 | info->count++; | |
1521 | info->blocked_open--; | |
1522 | #ifdef SERIAL_DEBUG_OPEN | |
1523 | printk("block_til_ready after blocking: ttyS%d, count = %d\n", | |
1524 | info->line, info->count); | |
1525 | #endif | |
1526 | if (retval) | |
1527 | return retval; | |
1528 | info->flags |= ZILOG_NORMAL_ACTIVE; | |
1529 | return 0; | |
1530 | } | |
1531 | ||
1532 | /* | |
1533 | * This routine is called whenever a serial port is opened. It | |
1534 | * enables interrupts for a serial port, linking in its ZILOG structure into | |
1535 | * the IRQ chain. It also performs the serial-specific | |
1536 | * initialization for the tty structure. | |
1537 | */ | |
1538 | int rs_open(struct tty_struct *tty, struct file * filp) | |
1539 | { | |
1540 | struct dec_serial *info; | |
1541 | int retval, line; | |
1542 | ||
1543 | line = tty->index; | |
1544 | if ((line < 0) || (line >= zs_channels_found)) | |
1545 | return -ENODEV; | |
1546 | info = zs_soft + line; | |
1547 | ||
1548 | if (info->hook) | |
1549 | return -ENODEV; | |
1550 | ||
1551 | if (serial_paranoia_check(info, tty->name, "rs_open")) | |
1552 | return -ENODEV; | |
1553 | #ifdef SERIAL_DEBUG_OPEN | |
1554 | printk("rs_open %s, count = %d\n", tty->name, info->count); | |
1555 | #endif | |
1556 | ||
1557 | info->count++; | |
1558 | tty->driver_data = info; | |
1559 | info->tty = tty; | |
1560 | ||
1561 | /* | |
1562 | * If the port is the middle of closing, bail out now | |
1563 | */ | |
1564 | if (tty_hung_up_p(filp) || | |
1565 | (info->flags & ZILOG_CLOSING)) { | |
1566 | if (info->flags & ZILOG_CLOSING) | |
1567 | interruptible_sleep_on(&info->close_wait); | |
1568 | #ifdef SERIAL_DO_RESTART | |
1569 | return ((info->flags & ZILOG_HUP_NOTIFY) ? | |
1570 | -EAGAIN : -ERESTARTSYS); | |
1571 | #else | |
1572 | return -EAGAIN; | |
1573 | #endif | |
1574 | } | |
1575 | ||
1576 | /* | |
1577 | * Start up serial port | |
1578 | */ | |
1579 | retval = zs_startup(info); | |
1580 | if (retval) | |
1581 | return retval; | |
1582 | ||
1583 | retval = block_til_ready(tty, filp, info); | |
1584 | if (retval) { | |
1585 | #ifdef SERIAL_DEBUG_OPEN | |
1586 | printk("rs_open returning after block_til_ready with %d\n", | |
1587 | retval); | |
1588 | #endif | |
1589 | return retval; | |
1590 | } | |
1591 | ||
1592 | #ifdef CONFIG_SERIAL_DEC_CONSOLE | |
1593 | if (sercons.cflag && sercons.index == line) { | |
1594 | tty->termios->c_cflag = sercons.cflag; | |
1595 | sercons.cflag = 0; | |
1596 | change_speed(info); | |
1597 | } | |
1598 | #endif | |
1599 | ||
1600 | #ifdef SERIAL_DEBUG_OPEN | |
1601 | printk("rs_open %s successful...", tty->name); | |
1602 | #endif | |
1603 | /* tty->low_latency = 1; */ | |
1604 | return 0; | |
1605 | } | |
1606 | ||
1607 | /* Finally, routines used to initialize the serial driver. */ | |
1608 | ||
1609 | static void __init show_serial_version(void) | |
1610 | { | |
1611 | printk("DECstation Z8530 serial driver version 0.09\n"); | |
1612 | } | |
1613 | ||
1614 | /* Initialize Z8530s zs_channels | |
1615 | */ | |
1616 | ||
1617 | static void __init probe_sccs(void) | |
1618 | { | |
1619 | struct dec_serial **pp; | |
1620 | int i, n, n_chips = 0, n_channels, chip, channel; | |
1621 | unsigned long flags; | |
1622 | ||
1623 | /* | |
1624 | * did we get here by accident? | |
1625 | */ | |
1626 | if(!BUS_PRESENT) { | |
1627 | printk("Not on JUNKIO machine, skipping probe_sccs\n"); | |
1628 | return; | |
1629 | } | |
1630 | ||
1631 | /* | |
1632 | * When serial console is activated, tc_init has not been called yet | |
1633 | * and system_base is undefined. Unfortunately we have to hardcode | |
1634 | * system_base for this case :-(. HK | |
1635 | */ | |
1636 | switch(mips_machtype) { | |
1637 | #ifdef CONFIG_MACH_DECSTATION | |
1638 | case MACH_DS5000_2X0: | |
1639 | case MACH_DS5900: | |
1640 | system_base = KSEG1ADDR(0x1f800000); | |
1641 | n_chips = 2; | |
1642 | zs_parms = &ds_parms; | |
1643 | zs_parms->irq0 = dec_interrupt[DEC_IRQ_SCC0]; | |
1644 | zs_parms->irq1 = dec_interrupt[DEC_IRQ_SCC1]; | |
1645 | break; | |
1646 | case MACH_DS5000_1XX: | |
1647 | system_base = KSEG1ADDR(0x1c000000); | |
1648 | n_chips = 2; | |
1649 | zs_parms = &ds_parms; | |
1650 | zs_parms->irq0 = dec_interrupt[DEC_IRQ_SCC0]; | |
1651 | zs_parms->irq1 = dec_interrupt[DEC_IRQ_SCC1]; | |
1652 | break; | |
1653 | case MACH_DS5000_XX: | |
1654 | system_base = KSEG1ADDR(0x1c000000); | |
1655 | n_chips = 1; | |
1656 | zs_parms = &ds_parms; | |
1657 | zs_parms->irq0 = dec_interrupt[DEC_IRQ_SCC0]; | |
1658 | break; | |
1659 | #endif | |
1660 | default: | |
1661 | panic("zs: unsupported bus"); | |
1662 | } | |
1663 | if (!zs_parms) | |
1664 | panic("zs: uninitialized parms"); | |
1665 | ||
1666 | pp = &zs_chain; | |
1667 | ||
1668 | n_channels = 0; | |
1669 | ||
1670 | for (chip = 0; chip < n_chips; chip++) { | |
1671 | for (channel = 0; channel <= 1; channel++) { | |
1672 | /* | |
1673 | * The sccs reside on the high byte of the 16 bit IOBUS | |
1674 | */ | |
1675 | zs_channels[n_channels].control = | |
1676 | (volatile unsigned char *)system_base + | |
1677 | (0 == chip ? zs_parms->scc0 : zs_parms->scc1) + | |
1678 | (0 == channel ? zs_parms->channel_a_offset : | |
1679 | zs_parms->channel_b_offset); | |
1680 | zs_channels[n_channels].data = | |
1681 | zs_channels[n_channels].control + 4; | |
1682 | ||
1683 | #ifndef CONFIG_SERIAL_DEC_CONSOLE | |
1684 | /* | |
1685 | * We're called early and memory managment isn't up, yet. | |
fb911ee8 | 1686 | * Thus request_region would fail. |
1da177e4 LT |
1687 | */ |
1688 | if (!request_region((unsigned long) | |
1689 | zs_channels[n_channels].control, | |
1690 | ZS_CHAN_IO_SIZE, "SCC")) | |
1691 | panic("SCC I/O region is not free"); | |
1692 | #endif | |
1693 | zs_soft[n_channels].zs_channel = &zs_channels[n_channels]; | |
1694 | /* HACK alert! */ | |
1695 | if (!(chip & 1)) | |
1696 | zs_soft[n_channels].irq = zs_parms->irq0; | |
1697 | else | |
1698 | zs_soft[n_channels].irq = zs_parms->irq1; | |
1699 | ||
1700 | /* | |
1701 | * Identification of channel A. Location of channel A | |
1702 | * inside chip depends on mapping of internal address | |
1703 | * the chip decodes channels by. | |
1704 | * CHANNEL_A_NR returns either 0 (in case of | |
1705 | * DECstations) or 1 (in case of Baget). | |
1706 | */ | |
1707 | if (CHANNEL_A_NR == channel) | |
1708 | zs_soft[n_channels].zs_chan_a = | |
1709 | &zs_channels[n_channels+1-2*CHANNEL_A_NR]; | |
1710 | else | |
1711 | zs_soft[n_channels].zs_chan_a = | |
1712 | &zs_channels[n_channels]; | |
1713 | ||
1714 | *pp = &zs_soft[n_channels]; | |
1715 | pp = &zs_soft[n_channels].zs_next; | |
1716 | n_channels++; | |
1717 | } | |
1718 | } | |
1719 | ||
1720 | *pp = 0; | |
1721 | zs_channels_found = n_channels; | |
1722 | ||
1723 | for (n = 0; n < zs_channels_found; n++) { | |
1724 | for (i = 0; i < 16; i++) { | |
1725 | zs_soft[n].zs_channel->curregs[i] = zs_init_regs[i]; | |
1726 | } | |
1727 | } | |
1728 | ||
1729 | save_and_cli(flags); | |
1730 | for (n = 0; n < zs_channels_found; n++) { | |
1731 | if (n % 2 == 0) { | |
1732 | write_zsreg(zs_soft[n].zs_chan_a, R9, FHWRES); | |
1733 | udelay(10); | |
1734 | write_zsreg(zs_soft[n].zs_chan_a, R9, 0); | |
1735 | } | |
1736 | load_zsregs(zs_soft[n].zs_channel, | |
1737 | zs_soft[n].zs_channel->curregs); | |
1738 | } | |
1739 | restore_flags(flags); | |
1740 | } | |
1741 | ||
1742 | static struct tty_operations serial_ops = { | |
1743 | .open = rs_open, | |
1744 | .close = rs_close, | |
1745 | .write = rs_write, | |
1746 | .flush_chars = rs_flush_chars, | |
1747 | .write_room = rs_write_room, | |
1748 | .chars_in_buffer = rs_chars_in_buffer, | |
1749 | .flush_buffer = rs_flush_buffer, | |
1750 | .ioctl = rs_ioctl, | |
1751 | .throttle = rs_throttle, | |
1752 | .unthrottle = rs_unthrottle, | |
1753 | .set_termios = rs_set_termios, | |
1754 | .stop = rs_stop, | |
1755 | .start = rs_start, | |
1756 | .hangup = rs_hangup, | |
1757 | .break_ctl = rs_break, | |
1758 | .wait_until_sent = rs_wait_until_sent, | |
1759 | .tiocmget = rs_tiocmget, | |
1760 | .tiocmset = rs_tiocmset, | |
1761 | }; | |
1762 | ||
1763 | /* zs_init inits the driver */ | |
1764 | int __init zs_init(void) | |
1765 | { | |
1766 | int channel, i; | |
1767 | struct dec_serial *info; | |
1768 | ||
1769 | if(!BUS_PRESENT) | |
1770 | return -ENODEV; | |
1771 | ||
1772 | /* Setup base handler, and timer table. */ | |
1773 | init_bh(SERIAL_BH, do_serial_bh); | |
1774 | ||
1775 | /* Find out how many Z8530 SCCs we have */ | |
1776 | if (zs_chain == 0) | |
1777 | probe_sccs(); | |
1778 | serial_driver = alloc_tty_driver(zs_channels_found); | |
1779 | if (!serial_driver) | |
1780 | return -ENOMEM; | |
1781 | ||
1782 | show_serial_version(); | |
1783 | ||
1784 | /* Initialize the tty_driver structure */ | |
1785 | /* Not all of this is exactly right for us. */ | |
1786 | ||
1787 | serial_driver->owner = THIS_MODULE; | |
1788 | serial_driver->devfs_name = "tts/"; | |
1789 | serial_driver->name = "ttyS"; | |
1790 | serial_driver->major = TTY_MAJOR; | |
1791 | serial_driver->minor_start = 64; | |
1792 | serial_driver->type = TTY_DRIVER_TYPE_SERIAL; | |
1793 | serial_driver->subtype = SERIAL_TYPE_NORMAL; | |
1794 | serial_driver->init_termios = tty_std_termios; | |
1795 | serial_driver->init_termios.c_cflag = | |
1796 | B9600 | CS8 | CREAD | HUPCL | CLOCAL; | |
1797 | serial_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_NO_DEVFS; | |
1798 | tty_set_operations(serial_driver, &serial_ops); | |
1799 | ||
1800 | if (tty_register_driver(serial_driver)) | |
1801 | panic("Couldn't register serial driver"); | |
1802 | ||
1803 | for (info = zs_chain, i = 0; info; info = info->zs_next, i++) { | |
1804 | ||
1805 | /* Needed before interrupts are enabled. */ | |
1806 | info->tty = 0; | |
1807 | info->x_char = 0; | |
1808 | ||
1809 | if (info->hook && info->hook->init_info) { | |
1810 | (*info->hook->init_info)(info); | |
1811 | continue; | |
1812 | } | |
1813 | ||
1814 | info->magic = SERIAL_MAGIC; | |
1815 | info->port = (int) info->zs_channel->control; | |
1816 | info->line = i; | |
1817 | info->custom_divisor = 16; | |
1818 | info->close_delay = 50; | |
1819 | info->closing_wait = 3000; | |
1820 | info->event = 0; | |
1821 | info->count = 0; | |
1822 | info->blocked_open = 0; | |
1823 | info->tqueue.routine = do_softint; | |
1824 | info->tqueue.data = info; | |
1825 | init_waitqueue_head(&info->open_wait); | |
1826 | init_waitqueue_head(&info->close_wait); | |
1827 | printk("ttyS%02d at 0x%08x (irq = %d) is a Z85C30 SCC\n", | |
1828 | info->line, info->port, info->irq); | |
1829 | tty_register_device(serial_driver, info->line, NULL); | |
1830 | ||
1831 | } | |
1832 | ||
1833 | for (channel = 0; channel < zs_channels_found; ++channel) { | |
1834 | zs_soft[channel].clk_divisor = 16; | |
1835 | zs_soft[channel].zs_baud = get_zsbaud(&zs_soft[channel]); | |
1836 | ||
1837 | if (request_irq(zs_soft[channel].irq, rs_interrupt, SA_SHIRQ, | |
1838 | "scc", &zs_soft[channel])) | |
1839 | printk(KERN_ERR "decserial: can't get irq %d\n", | |
1840 | zs_soft[channel].irq); | |
1841 | ||
1842 | if (zs_soft[channel].hook) { | |
1843 | zs_startup(&zs_soft[channel]); | |
1844 | if (zs_soft[channel].hook->init_channel) | |
1845 | (*zs_soft[channel].hook->init_channel) | |
1846 | (&zs_soft[channel]); | |
1847 | } | |
1848 | } | |
1849 | ||
1850 | return 0; | |
1851 | } | |
1852 | ||
1853 | /* | |
1854 | * polling I/O routines | |
1855 | */ | |
1856 | static int | |
1857 | zs_poll_tx_char(void *handle, unsigned char ch) | |
1858 | { | |
1859 | struct dec_serial *info = handle; | |
1860 | struct dec_zschannel *chan = info->zs_channel; | |
1861 | int ret; | |
1862 | ||
1863 | if(chan) { | |
1864 | int loops = 10000; | |
1865 | ||
1866 | while (loops && !(read_zsreg(chan, 0) & Tx_BUF_EMP)) | |
1867 | loops--; | |
1868 | ||
1869 | if (loops) { | |
1870 | write_zsdata(chan, ch); | |
1871 | ret = 0; | |
1872 | } else | |
1873 | ret = -EAGAIN; | |
1874 | ||
1875 | return ret; | |
1876 | } else | |
1877 | return -ENODEV; | |
1878 | } | |
1879 | ||
1880 | static int | |
1881 | zs_poll_rx_char(void *handle) | |
1882 | { | |
1883 | struct dec_serial *info = handle; | |
1884 | struct dec_zschannel *chan = info->zs_channel; | |
1885 | int ret; | |
1886 | ||
1887 | if(chan) { | |
1888 | int loops = 10000; | |
1889 | ||
1890 | while (loops && !(read_zsreg(chan, 0) & Rx_CH_AV)) | |
1891 | loops--; | |
1892 | ||
1893 | if (loops) | |
1894 | ret = read_zsdata(chan); | |
1895 | else | |
1896 | ret = -EAGAIN; | |
1897 | ||
1898 | return ret; | |
1899 | } else | |
1900 | return -ENODEV; | |
1901 | } | |
1902 | ||
1903 | int register_zs_hook(unsigned int channel, struct dec_serial_hook *hook) | |
1904 | { | |
1905 | struct dec_serial *info = &zs_soft[channel]; | |
1906 | ||
1907 | if (info->hook) { | |
1908 | printk("%s: line %d has already a hook registered\n", | |
1909 | __FUNCTION__, channel); | |
1910 | ||
1911 | return 0; | |
1912 | } else { | |
1913 | hook->poll_rx_char = zs_poll_rx_char; | |
1914 | hook->poll_tx_char = zs_poll_tx_char; | |
1915 | info->hook = hook; | |
1916 | ||
1917 | return 1; | |
1918 | } | |
1919 | } | |
1920 | ||
1921 | int unregister_zs_hook(unsigned int channel) | |
1922 | { | |
1923 | struct dec_serial *info = &zs_soft[channel]; | |
1924 | ||
1925 | if (info->hook) { | |
1926 | info->hook = NULL; | |
1927 | return 1; | |
1928 | } else { | |
1929 | printk("%s: trying to unregister hook on line %d," | |
1930 | " but none is registered\n", __FUNCTION__, channel); | |
1931 | return 0; | |
1932 | } | |
1933 | } | |
1934 | ||
1935 | /* | |
1936 | * ------------------------------------------------------------ | |
1937 | * Serial console driver | |
1938 | * ------------------------------------------------------------ | |
1939 | */ | |
1940 | #ifdef CONFIG_SERIAL_DEC_CONSOLE | |
1941 | ||
1942 | ||
1943 | /* | |
1944 | * Print a string to the serial port trying not to disturb | |
1945 | * any possible real use of the port... | |
1946 | */ | |
1947 | static void serial_console_write(struct console *co, const char *s, | |
1948 | unsigned count) | |
1949 | { | |
1950 | struct dec_serial *info; | |
1951 | int i; | |
1952 | ||
1953 | info = zs_soft + co->index; | |
1954 | ||
1955 | for (i = 0; i < count; i++, s++) { | |
1956 | if(*s == '\n') | |
1957 | zs_poll_tx_char(info, '\r'); | |
1958 | zs_poll_tx_char(info, *s); | |
1959 | } | |
1960 | } | |
1961 | ||
1962 | static struct tty_driver *serial_console_device(struct console *c, int *index) | |
1963 | { | |
1964 | *index = c->index; | |
1965 | return serial_driver; | |
1966 | } | |
1967 | ||
1968 | /* | |
1969 | * Setup initial baud/bits/parity. We do two things here: | |
1970 | * - construct a cflag setting for the first rs_open() | |
1971 | * - initialize the serial port | |
1972 | * Return non-zero if we didn't find a serial port. | |
1973 | */ | |
1974 | static int __init serial_console_setup(struct console *co, char *options) | |
1975 | { | |
1976 | struct dec_serial *info; | |
1977 | int baud = 9600; | |
1978 | int bits = 8; | |
1979 | int parity = 'n'; | |
1980 | int cflag = CREAD | HUPCL | CLOCAL; | |
1981 | int clk_divisor = 16; | |
1982 | int brg; | |
1983 | char *s; | |
1984 | unsigned long flags; | |
1985 | ||
1986 | if(!BUS_PRESENT) | |
1987 | return -ENODEV; | |
1988 | ||
1989 | info = zs_soft + co->index; | |
1990 | ||
1991 | if (zs_chain == 0) | |
1992 | probe_sccs(); | |
1993 | ||
1994 | info->is_cons = 1; | |
1995 | ||
1996 | if (options) { | |
1997 | baud = simple_strtoul(options, NULL, 10); | |
1998 | s = options; | |
1999 | while(*s >= '0' && *s <= '9') | |
2000 | s++; | |
2001 | if (*s) | |
2002 | parity = *s++; | |
2003 | if (*s) | |
2004 | bits = *s - '0'; | |
2005 | } | |
2006 | ||
2007 | /* | |
2008 | * Now construct a cflag setting. | |
2009 | */ | |
2010 | switch(baud) { | |
2011 | case 1200: | |
2012 | cflag |= B1200; | |
2013 | break; | |
2014 | case 2400: | |
2015 | cflag |= B2400; | |
2016 | break; | |
2017 | case 4800: | |
2018 | cflag |= B4800; | |
2019 | break; | |
2020 | case 19200: | |
2021 | cflag |= B19200; | |
2022 | break; | |
2023 | case 38400: | |
2024 | cflag |= B38400; | |
2025 | break; | |
2026 | case 57600: | |
2027 | cflag |= B57600; | |
2028 | break; | |
2029 | case 115200: | |
2030 | cflag |= B115200; | |
2031 | break; | |
2032 | case 9600: | |
2033 | default: | |
2034 | cflag |= B9600; | |
2035 | /* | |
2036 | * Set this to a sane value to prevent a divide error. | |
2037 | */ | |
2038 | baud = 9600; | |
2039 | break; | |
2040 | } | |
2041 | switch(bits) { | |
2042 | case 7: | |
2043 | cflag |= CS7; | |
2044 | break; | |
2045 | default: | |
2046 | case 8: | |
2047 | cflag |= CS8; | |
2048 | break; | |
2049 | } | |
2050 | switch(parity) { | |
2051 | case 'o': case 'O': | |
2052 | cflag |= PARODD; | |
2053 | break; | |
2054 | case 'e': case 'E': | |
2055 | cflag |= PARENB; | |
2056 | break; | |
2057 | } | |
2058 | co->cflag = cflag; | |
2059 | ||
2060 | save_and_cli(flags); | |
2061 | ||
2062 | /* | |
2063 | * Set up the baud rate generator. | |
2064 | */ | |
2065 | brg = BPS_TO_BRG(baud, zs_parms->clock / clk_divisor); | |
2066 | info->zs_channel->curregs[R12] = (brg & 255); | |
2067 | info->zs_channel->curregs[R13] = ((brg >> 8) & 255); | |
2068 | ||
2069 | /* | |
2070 | * Set byte size and parity. | |
2071 | */ | |
2072 | if (bits == 7) { | |
2073 | info->zs_channel->curregs[R3] |= Rx7; | |
2074 | info->zs_channel->curregs[R5] |= Tx7; | |
2075 | } else { | |
2076 | info->zs_channel->curregs[R3] |= Rx8; | |
2077 | info->zs_channel->curregs[R5] |= Tx8; | |
2078 | } | |
2079 | if (cflag & PARENB) { | |
2080 | info->zs_channel->curregs[R4] |= PAR_ENA; | |
2081 | } | |
2082 | if (!(cflag & PARODD)) { | |
2083 | info->zs_channel->curregs[R4] |= PAR_EVEN; | |
2084 | } | |
2085 | info->zs_channel->curregs[R4] |= SB1; | |
2086 | ||
2087 | /* | |
2088 | * Turn on RTS and DTR. | |
2089 | */ | |
2090 | zs_rtsdtr(info, RTS | DTR, 1); | |
2091 | ||
2092 | /* | |
2093 | * Finally, enable sequencing. | |
2094 | */ | |
2095 | info->zs_channel->curregs[R3] |= RxENABLE; | |
2096 | info->zs_channel->curregs[R5] |= TxENAB; | |
2097 | ||
2098 | /* | |
2099 | * Clear the interrupt registers. | |
2100 | */ | |
2101 | write_zsreg(info->zs_channel, R0, ERR_RES); | |
2102 | write_zsreg(info->zs_channel, R0, RES_H_IUS); | |
2103 | ||
2104 | /* | |
2105 | * Load up the new values. | |
2106 | */ | |
2107 | load_zsregs(info->zs_channel, info->zs_channel->curregs); | |
2108 | ||
2109 | /* Save the current value of RR0 */ | |
2110 | info->read_reg_zero = read_zsreg(info->zs_channel, R0); | |
2111 | ||
2112 | zs_soft[co->index].clk_divisor = clk_divisor; | |
2113 | zs_soft[co->index].zs_baud = get_zsbaud(&zs_soft[co->index]); | |
2114 | ||
2115 | restore_flags(flags); | |
2116 | ||
2117 | return 0; | |
2118 | } | |
2119 | ||
2120 | static struct console sercons = { | |
2121 | .name = "ttyS", | |
2122 | .write = serial_console_write, | |
2123 | .device = serial_console_device, | |
2124 | .setup = serial_console_setup, | |
2125 | .flags = CON_PRINTBUFFER, | |
2126 | .index = -1, | |
2127 | }; | |
2128 | ||
2129 | /* | |
2130 | * Register console. | |
2131 | */ | |
2132 | void __init zs_serial_console_init(void) | |
2133 | { | |
2134 | register_console(&sercons); | |
2135 | } | |
2136 | #endif /* ifdef CONFIG_SERIAL_DEC_CONSOLE */ | |
2137 | ||
2138 | #ifdef CONFIG_KGDB | |
2139 | struct dec_zschannel *zs_kgdbchan; | |
2140 | static unsigned char scc_inittab[] = { | |
2141 | 9, 0x80, /* reset A side (CHRA) */ | |
2142 | 13, 0, /* set baud rate divisor */ | |
2143 | 12, 1, | |
2144 | 14, 1, /* baud rate gen enable, src=rtxc (BRENABL) */ | |
2145 | 11, 0x50, /* clocks = br gen (RCBR | TCBR) */ | |
2146 | 5, 0x6a, /* tx 8 bits, assert RTS (Tx8 | TxENAB | RTS) */ | |
2147 | 4, 0x44, /* x16 clock, 1 stop (SB1 | X16CLK)*/ | |
2148 | 3, 0xc1, /* rx enable, 8 bits (RxENABLE | Rx8)*/ | |
2149 | }; | |
2150 | ||
2151 | /* These are for receiving and sending characters under the kgdb | |
2152 | * source level kernel debugger. | |
2153 | */ | |
2154 | void putDebugChar(char kgdb_char) | |
2155 | { | |
2156 | struct dec_zschannel *chan = zs_kgdbchan; | |
2157 | while ((read_zsreg(chan, 0) & Tx_BUF_EMP) == 0) | |
2158 | RECOVERY_DELAY; | |
2159 | write_zsdata(chan, kgdb_char); | |
2160 | } | |
2161 | char getDebugChar(void) | |
2162 | { | |
2163 | struct dec_zschannel *chan = zs_kgdbchan; | |
2164 | while((read_zsreg(chan, 0) & Rx_CH_AV) == 0) | |
2165 | eieio(); /*barrier();*/ | |
2166 | return read_zsdata(chan); | |
2167 | } | |
2168 | void kgdb_interruptible(int yes) | |
2169 | { | |
2170 | struct dec_zschannel *chan = zs_kgdbchan; | |
2171 | int one, nine; | |
2172 | nine = read_zsreg(chan, 9); | |
2173 | if (yes == 1) { | |
2174 | one = EXT_INT_ENAB|RxINT_ALL; | |
2175 | nine |= MIE; | |
2176 | printk("turning serial ints on\n"); | |
2177 | } else { | |
2178 | one = RxINT_DISAB; | |
2179 | nine &= ~MIE; | |
2180 | printk("turning serial ints off\n"); | |
2181 | } | |
2182 | write_zsreg(chan, 1, one); | |
2183 | write_zsreg(chan, 9, nine); | |
2184 | } | |
2185 | ||
2186 | static int kgdbhook_init_channel(void *handle) | |
2187 | { | |
2188 | return 0; | |
2189 | } | |
2190 | ||
2191 | static void kgdbhook_init_info(void *handle) | |
2192 | { | |
2193 | } | |
2194 | ||
2195 | static void kgdbhook_rx_char(void *handle, unsigned char ch, unsigned char fl) | |
2196 | { | |
2197 | struct dec_serial *info = handle; | |
2198 | ||
2199 | if (fl != TTY_NORMAL) | |
2200 | return; | |
2201 | if (ch == 0x03 || ch == '$') | |
2202 | breakpoint(); | |
2203 | } | |
2204 | ||
2205 | /* This sets up the serial port we're using, and turns on | |
2206 | * interrupts for that channel, so kgdb is usable once we're done. | |
2207 | */ | |
2208 | static inline void kgdb_chaninit(struct dec_zschannel *ms, int intson, int bps) | |
2209 | { | |
2210 | int brg; | |
2211 | int i, x; | |
2212 | volatile char *sccc = ms->control; | |
2213 | brg = BPS_TO_BRG(bps, zs_parms->clock/16); | |
2214 | printk("setting bps on kgdb line to %d [brg=%x]\n", bps, brg); | |
2215 | for (i = 20000; i != 0; --i) { | |
2216 | x = *sccc; eieio(); | |
2217 | } | |
2218 | for (i = 0; i < sizeof(scc_inittab); ++i) { | |
2219 | write_zsreg(ms, scc_inittab[i], scc_inittab[i+1]); | |
2220 | i++; | |
2221 | } | |
2222 | } | |
2223 | /* This is called at boot time to prime the kgdb serial debugging | |
2224 | * serial line. The 'tty_num' argument is 0 for /dev/ttya and 1 | |
2225 | * for /dev/ttyb which is determined in setup_arch() from the | |
2226 | * boot command line flags. | |
2227 | */ | |
2228 | struct dec_serial_hook zs_kgdbhook = { | |
2229 | .init_channel = kgdbhook_init_channel, | |
2230 | .init_info = kgdbhook_init_info, | |
2231 | .rx_char = kgdbhook_rx_char, | |
2232 | .cflags = B38400 | CS8 | CLOCAL, | |
2233 | } | |
2234 | ||
2235 | void __init zs_kgdb_hook(int tty_num) | |
2236 | { | |
2237 | /* Find out how many Z8530 SCCs we have */ | |
2238 | if (zs_chain == 0) | |
2239 | probe_sccs(); | |
2240 | zs_soft[tty_num].zs_channel = &zs_channels[tty_num]; | |
2241 | zs_kgdbchan = zs_soft[tty_num].zs_channel; | |
2242 | zs_soft[tty_num].change_needed = 0; | |
2243 | zs_soft[tty_num].clk_divisor = 16; | |
2244 | zs_soft[tty_num].zs_baud = 38400; | |
2245 | zs_soft[tty_num].hook = &zs_kgdbhook; /* This runs kgdb */ | |
2246 | /* Turn on transmitter/receiver at 8-bits/char */ | |
2247 | kgdb_chaninit(zs_soft[tty_num].zs_channel, 1, 38400); | |
2248 | printk("KGDB: on channel %d initialized\n", tty_num); | |
2249 | set_debug_traps(); /* init stub */ | |
2250 | } | |
2251 | #endif /* ifdef CONFIG_KGDB */ | |
2252 | ||
2253 |