Commit | Line | Data |
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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 | |
0905780a | 9 | * Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005 Maciej W. Rozycki |
1da177e4 LT |
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> | |
0905780a | 58 | #include <linux/spinlock.h> |
1da177e4 LT |
59 | #ifdef CONFIG_SERIAL_DEC_CONSOLE |
60 | #include <linux/console.h> | |
61 | #endif | |
62 | ||
63 | #include <asm/io.h> | |
64 | #include <asm/pgtable.h> | |
65 | #include <asm/irq.h> | |
66 | #include <asm/system.h> | |
1da177e4 | 67 | #include <asm/bootinfo.h> |
1da177e4 | 68 | |
1da177e4 | 69 | #include <asm/dec/interrupts.h> |
a5fc9c0b | 70 | #include <asm/dec/ioasic_addrs.h> |
1da177e4 | 71 | #include <asm/dec/machtype.h> |
a5fc9c0b MR |
72 | #include <asm/dec/serial.h> |
73 | #include <asm/dec/system.h> | |
1da177e4 | 74 | #include <asm/dec/tc.h> |
a5fc9c0b | 75 | |
1da177e4 LT |
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 | ||
0905780a MR |
131 | DEFINE_SPINLOCK(zs_lock); |
132 | ||
1da177e4 LT |
133 | struct dec_zschannel zs_channels[NUM_CHANNELS]; |
134 | struct dec_serial zs_soft[NUM_CHANNELS]; | |
135 | int zs_channels_found; | |
136 | struct dec_serial *zs_chain; /* list of all channels */ | |
137 | ||
138 | struct tty_struct zs_ttys[NUM_CHANNELS]; | |
139 | ||
140 | #ifdef CONFIG_SERIAL_DEC_CONSOLE | |
141 | static struct console sercons; | |
142 | #endif | |
143 | #if defined(CONFIG_SERIAL_DEC_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ) && \ | |
144 | !defined(MODULE) | |
145 | static unsigned long break_pressed; /* break, really ... */ | |
146 | #endif | |
147 | ||
148 | static unsigned char zs_init_regs[16] __initdata = { | |
149 | 0, /* write 0 */ | |
150 | 0, /* write 1 */ | |
151 | 0, /* write 2 */ | |
152 | 0, /* write 3 */ | |
153 | (X16CLK), /* write 4 */ | |
154 | 0, /* write 5 */ | |
155 | 0, 0, 0, /* write 6, 7, 8 */ | |
156 | (MIE | DLC | NV), /* write 9 */ | |
157 | (NRZ), /* write 10 */ | |
158 | (TCBR | RCBR), /* write 11 */ | |
159 | 0, 0, /* BRG time constant, write 12 + 13 */ | |
160 | (BRSRC | BRENABL), /* write 14 */ | |
161 | 0 /* write 15 */ | |
162 | }; | |
163 | ||
1da177e4 LT |
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 | ||
1da177e4 LT |
189 | static void probe_sccs(void); |
190 | static void change_speed(struct dec_serial *info); | |
191 | static void rs_wait_until_sent(struct tty_struct *tty, int timeout); | |
192 | ||
1da177e4 LT |
193 | static inline int serial_paranoia_check(struct dec_serial *info, |
194 | char *name, const char *routine) | |
195 | { | |
196 | #ifdef SERIAL_PARANOIA_CHECK | |
197 | static const char *badmagic = | |
198 | "Warning: bad magic number for serial struct %s in %s\n"; | |
199 | static const char *badinfo = | |
200 | "Warning: null mac_serial for %s in %s\n"; | |
201 | ||
202 | if (!info) { | |
203 | printk(badinfo, name, routine); | |
204 | return 1; | |
205 | } | |
206 | if (info->magic != SERIAL_MAGIC) { | |
207 | printk(badmagic, name, routine); | |
208 | return 1; | |
209 | } | |
210 | #endif | |
211 | return 0; | |
212 | } | |
213 | ||
214 | /* | |
215 | * This is used to figure out the divisor speeds and the timeouts | |
216 | */ | |
217 | static int baud_table[] = { | |
218 | 0, 50, 75, 110, 134, 150, 200, 300, 600, 1200, 1800, 2400, 4800, | |
219 | 9600, 19200, 38400, 57600, 115200, 0 }; | |
220 | ||
221 | /* | |
222 | * Reading and writing Z8530 registers. | |
223 | */ | |
224 | static inline unsigned char read_zsreg(struct dec_zschannel *channel, | |
225 | unsigned char reg) | |
226 | { | |
227 | unsigned char retval; | |
228 | ||
229 | if (reg != 0) { | |
230 | *channel->control = reg & 0xf; | |
231 | fast_iob(); RECOVERY_DELAY; | |
232 | } | |
233 | retval = *channel->control; | |
234 | RECOVERY_DELAY; | |
235 | return retval; | |
236 | } | |
237 | ||
238 | static inline void write_zsreg(struct dec_zschannel *channel, | |
239 | unsigned char reg, unsigned char value) | |
240 | { | |
241 | if (reg != 0) { | |
242 | *channel->control = reg & 0xf; | |
243 | fast_iob(); RECOVERY_DELAY; | |
244 | } | |
245 | *channel->control = value; | |
246 | fast_iob(); RECOVERY_DELAY; | |
247 | return; | |
248 | } | |
249 | ||
250 | static inline unsigned char read_zsdata(struct dec_zschannel *channel) | |
251 | { | |
252 | unsigned char retval; | |
253 | ||
254 | retval = *channel->data; | |
255 | RECOVERY_DELAY; | |
256 | return retval; | |
257 | } | |
258 | ||
259 | static inline void write_zsdata(struct dec_zschannel *channel, | |
260 | unsigned char value) | |
261 | { | |
262 | *channel->data = value; | |
263 | fast_iob(); RECOVERY_DELAY; | |
264 | return; | |
265 | } | |
266 | ||
267 | static inline void load_zsregs(struct dec_zschannel *channel, | |
268 | unsigned char *regs) | |
269 | { | |
270 | /* ZS_CLEARERR(channel); | |
271 | ZS_CLEARFIFO(channel); */ | |
272 | /* Load 'em up */ | |
273 | write_zsreg(channel, R3, regs[R3] & ~RxENABLE); | |
274 | write_zsreg(channel, R5, regs[R5] & ~TxENAB); | |
275 | write_zsreg(channel, R4, regs[R4]); | |
276 | write_zsreg(channel, R9, regs[R9]); | |
277 | write_zsreg(channel, R1, regs[R1]); | |
278 | write_zsreg(channel, R2, regs[R2]); | |
279 | write_zsreg(channel, R10, regs[R10]); | |
280 | write_zsreg(channel, R11, regs[R11]); | |
281 | write_zsreg(channel, R12, regs[R12]); | |
282 | write_zsreg(channel, R13, regs[R13]); | |
283 | write_zsreg(channel, R14, regs[R14]); | |
284 | write_zsreg(channel, R15, regs[R15]); | |
285 | write_zsreg(channel, R3, regs[R3]); | |
286 | write_zsreg(channel, R5, regs[R5]); | |
287 | return; | |
288 | } | |
289 | ||
290 | /* Sets or clears DTR/RTS on the requested line */ | |
291 | static inline void zs_rtsdtr(struct dec_serial *info, int which, int set) | |
292 | { | |
293 | unsigned long flags; | |
294 | ||
0905780a | 295 | spin_lock_irqsave(&zs_lock, flags); |
1da177e4 LT |
296 | if (info->zs_channel != info->zs_chan_a) { |
297 | if (set) { | |
298 | info->zs_chan_a->curregs[5] |= (which & (RTS | DTR)); | |
299 | } else { | |
300 | info->zs_chan_a->curregs[5] &= ~(which & (RTS | DTR)); | |
301 | } | |
302 | write_zsreg(info->zs_chan_a, 5, info->zs_chan_a->curregs[5]); | |
303 | } | |
0905780a | 304 | spin_unlock_irqrestore(&zs_lock, flags); |
1da177e4 LT |
305 | } |
306 | ||
307 | /* Utility routines for the Zilog */ | |
308 | static inline int get_zsbaud(struct dec_serial *ss) | |
309 | { | |
310 | struct dec_zschannel *channel = ss->zs_channel; | |
311 | int brg; | |
312 | ||
313 | /* The baud rate is split up between two 8-bit registers in | |
314 | * what is termed 'BRG time constant' format in my docs for | |
315 | * the chip, it is a function of the clk rate the chip is | |
316 | * receiving which happens to be constant. | |
317 | */ | |
318 | brg = (read_zsreg(channel, 13) << 8); | |
319 | brg |= read_zsreg(channel, 12); | |
320 | return BRG_TO_BPS(brg, (zs_parms->clock/(ss->clk_divisor))); | |
321 | } | |
322 | ||
323 | /* On receive, this clears errors and the receiver interrupts */ | |
324 | static inline void rs_recv_clear(struct dec_zschannel *zsc) | |
325 | { | |
326 | write_zsreg(zsc, 0, ERR_RES); | |
327 | write_zsreg(zsc, 0, RES_H_IUS); /* XXX this is unnecessary */ | |
328 | } | |
329 | ||
330 | /* | |
331 | * ---------------------------------------------------------------------- | |
332 | * | |
333 | * Here starts the interrupt handling routines. All of the following | |
334 | * subroutines are declared as inline and are folded into | |
335 | * rs_interrupt(). They were separated out for readability's sake. | |
336 | * | |
337 | * - Ted Ts'o (tytso@mit.edu), 7-Mar-93 | |
338 | * ----------------------------------------------------------------------- | |
339 | */ | |
340 | ||
341 | /* | |
342 | * This routine is used by the interrupt handler to schedule | |
343 | * processing in the software interrupt portion of the driver. | |
344 | */ | |
41c28ff1 | 345 | static void rs_sched_event(struct dec_serial *info, int event) |
1da177e4 LT |
346 | { |
347 | info->event |= 1 << event; | |
0905780a | 348 | tasklet_schedule(&info->tlet); |
1da177e4 LT |
349 | } |
350 | ||
41c28ff1 | 351 | static void receive_chars(struct dec_serial *info, struct pt_regs *regs) |
1da177e4 LT |
352 | { |
353 | struct tty_struct *tty = info->tty; | |
354 | unsigned char ch, stat, flag; | |
355 | ||
356 | while ((read_zsreg(info->zs_channel, R0) & Rx_CH_AV) != 0) { | |
357 | ||
358 | stat = read_zsreg(info->zs_channel, R1); | |
359 | ch = read_zsdata(info->zs_channel); | |
360 | ||
361 | if (!tty && (!info->hook || !info->hook->rx_char)) | |
362 | continue; | |
363 | ||
364 | flag = TTY_NORMAL; | |
365 | if (info->tty_break) { | |
366 | info->tty_break = 0; | |
367 | flag = TTY_BREAK; | |
368 | if (info->flags & ZILOG_SAK) | |
369 | do_SAK(tty); | |
370 | /* Ignore the null char got when BREAK is removed. */ | |
371 | if (ch == 0) | |
372 | continue; | |
373 | } else { | |
374 | if (stat & Rx_OVR) { | |
375 | flag = TTY_OVERRUN; | |
376 | } else if (stat & FRM_ERR) { | |
377 | flag = TTY_FRAME; | |
378 | } else if (stat & PAR_ERR) { | |
379 | flag = TTY_PARITY; | |
380 | } | |
381 | if (flag != TTY_NORMAL) | |
382 | /* reset the error indication */ | |
383 | write_zsreg(info->zs_channel, R0, ERR_RES); | |
384 | } | |
385 | ||
386 | #if defined(CONFIG_SERIAL_DEC_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ) && \ | |
387 | !defined(MODULE) | |
388 | if (break_pressed && info->line == sercons.index) { | |
389 | /* Ignore the null char got when BREAK is removed. */ | |
390 | if (ch == 0) | |
391 | continue; | |
392 | if (time_before(jiffies, break_pressed + HZ * 5)) { | |
393 | handle_sysrq(ch, regs, NULL); | |
394 | break_pressed = 0; | |
395 | continue; | |
396 | } | |
397 | break_pressed = 0; | |
398 | } | |
399 | #endif | |
400 | ||
401 | if (info->hook && info->hook->rx_char) { | |
402 | (*info->hook->rx_char)(ch, flag); | |
403 | return; | |
404 | } | |
405 | ||
406 | tty_insert_flip_char(tty, ch, flag); | |
407 | } | |
408 | if (tty) | |
409 | tty_flip_buffer_push(tty); | |
410 | } | |
411 | ||
412 | static void transmit_chars(struct dec_serial *info) | |
413 | { | |
414 | if ((read_zsreg(info->zs_channel, R0) & Tx_BUF_EMP) == 0) | |
415 | return; | |
416 | info->tx_active = 0; | |
417 | ||
418 | if (info->x_char) { | |
419 | /* Send next char */ | |
420 | write_zsdata(info->zs_channel, info->x_char); | |
421 | info->x_char = 0; | |
422 | info->tx_active = 1; | |
423 | return; | |
424 | } | |
425 | ||
426 | if ((info->xmit_cnt <= 0) || (info->tty && info->tty->stopped) | |
427 | || info->tx_stopped) { | |
428 | write_zsreg(info->zs_channel, R0, RES_Tx_P); | |
429 | return; | |
430 | } | |
431 | /* Send char */ | |
432 | write_zsdata(info->zs_channel, info->xmit_buf[info->xmit_tail++]); | |
433 | info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1); | |
434 | info->xmit_cnt--; | |
435 | info->tx_active = 1; | |
436 | ||
437 | if (info->xmit_cnt < WAKEUP_CHARS) | |
438 | rs_sched_event(info, RS_EVENT_WRITE_WAKEUP); | |
439 | } | |
440 | ||
41c28ff1 | 441 | static void status_handle(struct dec_serial *info) |
1da177e4 LT |
442 | { |
443 | unsigned char stat; | |
444 | ||
445 | /* Get status from Read Register 0 */ | |
446 | stat = read_zsreg(info->zs_channel, R0); | |
447 | ||
448 | if ((stat & BRK_ABRT) && !(info->read_reg_zero & BRK_ABRT)) { | |
449 | #if defined(CONFIG_SERIAL_DEC_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ) && \ | |
450 | !defined(MODULE) | |
451 | if (info->line == sercons.index) { | |
452 | if (!break_pressed) | |
453 | break_pressed = jiffies; | |
454 | } else | |
455 | #endif | |
456 | info->tty_break = 1; | |
457 | } | |
458 | ||
459 | if (info->zs_channel != info->zs_chan_a) { | |
460 | ||
461 | /* Check for DCD transitions */ | |
462 | if (info->tty && !C_CLOCAL(info->tty) && | |
463 | ((stat ^ info->read_reg_zero) & DCD) != 0 ) { | |
464 | if (stat & DCD) { | |
465 | wake_up_interruptible(&info->open_wait); | |
466 | } else { | |
467 | tty_hangup(info->tty); | |
468 | } | |
469 | } | |
470 | ||
471 | /* Check for CTS transitions */ | |
472 | if (info->tty && C_CRTSCTS(info->tty)) { | |
473 | if ((stat & CTS) != 0) { | |
474 | if (info->tx_stopped) { | |
475 | info->tx_stopped = 0; | |
476 | if (!info->tx_active) | |
477 | transmit_chars(info); | |
478 | } | |
479 | } else { | |
480 | info->tx_stopped = 1; | |
481 | } | |
482 | } | |
483 | ||
484 | } | |
485 | ||
486 | /* Clear status condition... */ | |
487 | write_zsreg(info->zs_channel, R0, RES_EXT_INT); | |
488 | info->read_reg_zero = stat; | |
489 | } | |
490 | ||
491 | /* | |
492 | * This is the serial driver's generic interrupt routine | |
493 | */ | |
0905780a | 494 | static irqreturn_t rs_interrupt(int irq, void *dev_id, struct pt_regs *regs) |
1da177e4 LT |
495 | { |
496 | struct dec_serial *info = (struct dec_serial *) dev_id; | |
0905780a | 497 | irqreturn_t status = IRQ_NONE; |
1da177e4 LT |
498 | unsigned char zs_intreg; |
499 | int shift; | |
500 | ||
501 | /* NOTE: The read register 3, which holds the irq status, | |
502 | * does so for both channels on each chip. Although | |
503 | * the status value itself must be read from the A | |
504 | * channel and is only valid when read from channel A. | |
505 | * Yes... broken hardware... | |
506 | */ | |
507 | #define CHAN_IRQMASK (CHBRxIP | CHBTxIP | CHBEXT) | |
508 | ||
509 | if (info->zs_chan_a == info->zs_channel) | |
510 | shift = 3; /* Channel A */ | |
511 | else | |
512 | shift = 0; /* Channel B */ | |
513 | ||
514 | for (;;) { | |
515 | zs_intreg = read_zsreg(info->zs_chan_a, R3) >> shift; | |
516 | if ((zs_intreg & CHAN_IRQMASK) == 0) | |
517 | break; | |
518 | ||
0905780a MR |
519 | status = IRQ_HANDLED; |
520 | ||
1da177e4 LT |
521 | if (zs_intreg & CHBRxIP) { |
522 | receive_chars(info, regs); | |
523 | } | |
524 | if (zs_intreg & CHBTxIP) { | |
525 | transmit_chars(info); | |
526 | } | |
527 | if (zs_intreg & CHBEXT) { | |
528 | status_handle(info); | |
529 | } | |
530 | } | |
531 | ||
532 | /* Why do we need this ? */ | |
533 | write_zsreg(info->zs_channel, 0, RES_H_IUS); | |
0905780a MR |
534 | |
535 | return status; | |
1da177e4 LT |
536 | } |
537 | ||
538 | #ifdef ZS_DEBUG_REGS | |
539 | void zs_dump (void) { | |
540 | int i, j; | |
541 | for (i = 0; i < zs_channels_found; i++) { | |
542 | struct dec_zschannel *ch = &zs_channels[i]; | |
543 | if ((long)ch->control == UNI_IO_BASE+UNI_SCC1A_CTRL) { | |
544 | for (j = 0; j < 15; j++) { | |
545 | printk("W%d = 0x%x\t", | |
546 | j, (int)ch->curregs[j]); | |
547 | } | |
548 | for (j = 0; j < 15; j++) { | |
549 | printk("R%d = 0x%x\t", | |
550 | j, (int)read_zsreg(ch,j)); | |
551 | } | |
552 | printk("\n\n"); | |
553 | } | |
554 | } | |
555 | } | |
556 | #endif | |
557 | ||
558 | /* | |
559 | * ------------------------------------------------------------------- | |
560 | * Here ends the serial interrupt routines. | |
561 | * ------------------------------------------------------------------- | |
562 | */ | |
563 | ||
564 | /* | |
565 | * ------------------------------------------------------------ | |
566 | * rs_stop() and rs_start() | |
567 | * | |
568 | * This routines are called before setting or resetting tty->stopped. | |
569 | * ------------------------------------------------------------ | |
570 | */ | |
571 | static void rs_stop(struct tty_struct *tty) | |
572 | { | |
573 | struct dec_serial *info = (struct dec_serial *)tty->driver_data; | |
574 | unsigned long flags; | |
575 | ||
576 | if (serial_paranoia_check(info, tty->name, "rs_stop")) | |
577 | return; | |
578 | ||
579 | #if 1 | |
0905780a | 580 | spin_lock_irqsave(&zs_lock, flags); |
1da177e4 LT |
581 | if (info->zs_channel->curregs[5] & TxENAB) { |
582 | info->zs_channel->curregs[5] &= ~TxENAB; | |
583 | write_zsreg(info->zs_channel, 5, info->zs_channel->curregs[5]); | |
584 | } | |
0905780a | 585 | spin_unlock_irqrestore(&zs_lock, flags); |
1da177e4 LT |
586 | #endif |
587 | } | |
588 | ||
589 | static void rs_start(struct tty_struct *tty) | |
590 | { | |
591 | struct dec_serial *info = (struct dec_serial *)tty->driver_data; | |
592 | unsigned long flags; | |
593 | ||
594 | if (serial_paranoia_check(info, tty->name, "rs_start")) | |
595 | return; | |
596 | ||
0905780a | 597 | spin_lock_irqsave(&zs_lock, flags); |
1da177e4 LT |
598 | #if 1 |
599 | if (info->xmit_cnt && info->xmit_buf && !(info->zs_channel->curregs[5] & TxENAB)) { | |
600 | info->zs_channel->curregs[5] |= TxENAB; | |
601 | write_zsreg(info->zs_channel, 5, info->zs_channel->curregs[5]); | |
602 | } | |
603 | #else | |
604 | if (info->xmit_cnt && info->xmit_buf && !info->tx_active) { | |
605 | transmit_chars(info); | |
606 | } | |
607 | #endif | |
0905780a | 608 | spin_unlock_irqrestore(&zs_lock, flags); |
1da177e4 LT |
609 | } |
610 | ||
611 | /* | |
612 | * This routine is used to handle the "bottom half" processing for the | |
613 | * serial driver, known also the "software interrupt" processing. | |
614 | * This processing is done at the kernel interrupt level, after the | |
615 | * rs_interrupt() has returned, BUT WITH INTERRUPTS TURNED ON. This | |
616 | * is where time-consuming activities which can not be done in the | |
617 | * interrupt driver proper are done; the interrupt driver schedules | |
618 | * them using rs_sched_event(), and they get done here. | |
619 | */ | |
1da177e4 | 620 | |
0905780a | 621 | static void do_softint(unsigned long private_) |
1da177e4 LT |
622 | { |
623 | struct dec_serial *info = (struct dec_serial *) private_; | |
624 | struct tty_struct *tty; | |
625 | ||
626 | tty = info->tty; | |
627 | if (!tty) | |
628 | return; | |
629 | ||
630 | if (test_and_clear_bit(RS_EVENT_WRITE_WAKEUP, &info->event)) { | |
631 | tty_wakeup(tty); | |
0905780a | 632 | wake_up_interruptible(&tty->write_wait); |
1da177e4 LT |
633 | } |
634 | } | |
635 | ||
0905780a | 636 | static int zs_startup(struct dec_serial * info) |
1da177e4 LT |
637 | { |
638 | unsigned long flags; | |
639 | ||
640 | if (info->flags & ZILOG_INITIALIZED) | |
641 | return 0; | |
642 | ||
643 | if (!info->xmit_buf) { | |
644 | info->xmit_buf = (unsigned char *) get_zeroed_page(GFP_KERNEL); | |
645 | if (!info->xmit_buf) | |
646 | return -ENOMEM; | |
647 | } | |
648 | ||
0905780a | 649 | spin_lock_irqsave(&zs_lock, flags); |
1da177e4 LT |
650 | |
651 | #ifdef SERIAL_DEBUG_OPEN | |
652 | printk("starting up ttyS%d (irq %d)...", info->line, info->irq); | |
653 | #endif | |
654 | ||
655 | /* | |
656 | * Clear the receive FIFO. | |
657 | */ | |
658 | ZS_CLEARFIFO(info->zs_channel); | |
659 | info->xmit_fifo_size = 1; | |
660 | ||
661 | /* | |
662 | * Clear the interrupt registers. | |
663 | */ | |
664 | write_zsreg(info->zs_channel, R0, ERR_RES); | |
665 | write_zsreg(info->zs_channel, R0, RES_H_IUS); | |
666 | ||
667 | /* | |
668 | * Set the speed of the serial port | |
669 | */ | |
670 | change_speed(info); | |
671 | ||
672 | /* | |
673 | * Turn on RTS and DTR. | |
674 | */ | |
675 | zs_rtsdtr(info, RTS | DTR, 1); | |
676 | ||
677 | /* | |
678 | * Finally, enable sequencing and interrupts | |
679 | */ | |
680 | info->zs_channel->curregs[R1] &= ~RxINT_MASK; | |
681 | info->zs_channel->curregs[R1] |= (RxINT_ALL | TxINT_ENAB | | |
682 | EXT_INT_ENAB); | |
683 | info->zs_channel->curregs[R3] |= RxENABLE; | |
684 | info->zs_channel->curregs[R5] |= TxENAB; | |
685 | info->zs_channel->curregs[R15] |= (DCDIE | CTSIE | TxUIE | BRKIE); | |
686 | write_zsreg(info->zs_channel, R1, info->zs_channel->curregs[R1]); | |
687 | write_zsreg(info->zs_channel, R3, info->zs_channel->curregs[R3]); | |
688 | write_zsreg(info->zs_channel, R5, info->zs_channel->curregs[R5]); | |
689 | write_zsreg(info->zs_channel, R15, info->zs_channel->curregs[R15]); | |
690 | ||
691 | /* | |
692 | * And clear the interrupt registers again for luck. | |
693 | */ | |
694 | write_zsreg(info->zs_channel, R0, ERR_RES); | |
695 | write_zsreg(info->zs_channel, R0, RES_H_IUS); | |
696 | ||
697 | /* Save the current value of RR0 */ | |
698 | info->read_reg_zero = read_zsreg(info->zs_channel, R0); | |
699 | ||
700 | if (info->tty) | |
701 | clear_bit(TTY_IO_ERROR, &info->tty->flags); | |
702 | info->xmit_cnt = info->xmit_head = info->xmit_tail = 0; | |
703 | ||
704 | info->flags |= ZILOG_INITIALIZED; | |
0905780a | 705 | spin_unlock_irqrestore(&zs_lock, flags); |
1da177e4 LT |
706 | return 0; |
707 | } | |
708 | ||
709 | /* | |
710 | * This routine will shutdown a serial port; interrupts are disabled, and | |
711 | * DTR is dropped if the hangup on close termio flag is on. | |
712 | */ | |
713 | static void shutdown(struct dec_serial * info) | |
714 | { | |
715 | unsigned long flags; | |
716 | ||
717 | if (!(info->flags & ZILOG_INITIALIZED)) | |
718 | return; | |
719 | ||
720 | #ifdef SERIAL_DEBUG_OPEN | |
721 | printk("Shutting down serial port %d (irq %d)....", info->line, | |
722 | info->irq); | |
723 | #endif | |
724 | ||
0905780a | 725 | spin_lock_irqsave(&zs_lock, flags); |
1da177e4 LT |
726 | |
727 | if (info->xmit_buf) { | |
728 | free_page((unsigned long) info->xmit_buf); | |
729 | info->xmit_buf = 0; | |
730 | } | |
731 | ||
732 | info->zs_channel->curregs[1] = 0; | |
733 | write_zsreg(info->zs_channel, 1, info->zs_channel->curregs[1]); /* no interrupts */ | |
734 | ||
735 | info->zs_channel->curregs[3] &= ~RxENABLE; | |
736 | write_zsreg(info->zs_channel, 3, info->zs_channel->curregs[3]); | |
737 | ||
738 | info->zs_channel->curregs[5] &= ~TxENAB; | |
739 | write_zsreg(info->zs_channel, 5, info->zs_channel->curregs[5]); | |
740 | if (!info->tty || C_HUPCL(info->tty)) { | |
741 | zs_rtsdtr(info, RTS | DTR, 0); | |
742 | } | |
743 | ||
744 | if (info->tty) | |
745 | set_bit(TTY_IO_ERROR, &info->tty->flags); | |
746 | ||
747 | info->flags &= ~ZILOG_INITIALIZED; | |
0905780a | 748 | spin_unlock_irqrestore(&zs_lock, flags); |
1da177e4 LT |
749 | } |
750 | ||
751 | /* | |
752 | * This routine is called to set the UART divisor registers to match | |
753 | * the specified baud rate for a serial port. | |
754 | */ | |
755 | static void change_speed(struct dec_serial *info) | |
756 | { | |
757 | unsigned cflag; | |
758 | int i; | |
759 | int brg, bits; | |
760 | unsigned long flags; | |
761 | ||
762 | if (!info->hook) { | |
763 | if (!info->tty || !info->tty->termios) | |
764 | return; | |
765 | cflag = info->tty->termios->c_cflag; | |
766 | if (!info->port) | |
767 | return; | |
768 | } else { | |
769 | cflag = info->hook->cflags; | |
770 | } | |
771 | ||
772 | i = cflag & CBAUD; | |
773 | if (i & CBAUDEX) { | |
774 | i &= ~CBAUDEX; | |
775 | if (i < 1 || i > 2) { | |
776 | if (!info->hook) | |
777 | info->tty->termios->c_cflag &= ~CBAUDEX; | |
778 | else | |
779 | info->hook->cflags &= ~CBAUDEX; | |
780 | } else | |
781 | i += 15; | |
782 | } | |
783 | ||
0905780a | 784 | spin_lock_irqsave(&zs_lock, flags); |
1da177e4 LT |
785 | info->zs_baud = baud_table[i]; |
786 | if (info->zs_baud) { | |
787 | brg = BPS_TO_BRG(info->zs_baud, zs_parms->clock/info->clk_divisor); | |
788 | info->zs_channel->curregs[12] = (brg & 255); | |
789 | info->zs_channel->curregs[13] = ((brg >> 8) & 255); | |
790 | zs_rtsdtr(info, DTR, 1); | |
791 | } else { | |
792 | zs_rtsdtr(info, RTS | DTR, 0); | |
793 | return; | |
794 | } | |
795 | ||
796 | /* byte size and parity */ | |
797 | info->zs_channel->curregs[3] &= ~RxNBITS_MASK; | |
798 | info->zs_channel->curregs[5] &= ~TxNBITS_MASK; | |
799 | switch (cflag & CSIZE) { | |
800 | case CS5: | |
801 | bits = 7; | |
802 | info->zs_channel->curregs[3] |= Rx5; | |
803 | info->zs_channel->curregs[5] |= Tx5; | |
804 | break; | |
805 | case CS6: | |
806 | bits = 8; | |
807 | info->zs_channel->curregs[3] |= Rx6; | |
808 | info->zs_channel->curregs[5] |= Tx6; | |
809 | break; | |
810 | case CS7: | |
811 | bits = 9; | |
812 | info->zs_channel->curregs[3] |= Rx7; | |
813 | info->zs_channel->curregs[5] |= Tx7; | |
814 | break; | |
815 | case CS8: | |
816 | default: /* defaults to 8 bits */ | |
817 | bits = 10; | |
818 | info->zs_channel->curregs[3] |= Rx8; | |
819 | info->zs_channel->curregs[5] |= Tx8; | |
820 | break; | |
821 | } | |
822 | ||
823 | info->timeout = ((info->xmit_fifo_size*HZ*bits) / info->zs_baud); | |
824 | info->timeout += HZ/50; /* Add .02 seconds of slop */ | |
825 | ||
826 | info->zs_channel->curregs[4] &= ~(SB_MASK | PAR_ENA | PAR_EVEN); | |
827 | if (cflag & CSTOPB) { | |
828 | info->zs_channel->curregs[4] |= SB2; | |
829 | } else { | |
830 | info->zs_channel->curregs[4] |= SB1; | |
831 | } | |
832 | if (cflag & PARENB) { | |
833 | info->zs_channel->curregs[4] |= PAR_ENA; | |
834 | } | |
835 | if (!(cflag & PARODD)) { | |
836 | info->zs_channel->curregs[4] |= PAR_EVEN; | |
837 | } | |
838 | ||
839 | if (!(cflag & CLOCAL)) { | |
840 | if (!(info->zs_channel->curregs[15] & DCDIE)) | |
841 | info->read_reg_zero = read_zsreg(info->zs_channel, 0); | |
842 | info->zs_channel->curregs[15] |= DCDIE; | |
843 | } else | |
844 | info->zs_channel->curregs[15] &= ~DCDIE; | |
845 | if (cflag & CRTSCTS) { | |
846 | info->zs_channel->curregs[15] |= CTSIE; | |
847 | if ((read_zsreg(info->zs_channel, 0) & CTS) == 0) | |
848 | info->tx_stopped = 1; | |
849 | } else { | |
850 | info->zs_channel->curregs[15] &= ~CTSIE; | |
851 | info->tx_stopped = 0; | |
852 | } | |
853 | ||
854 | /* Load up the new values */ | |
855 | load_zsregs(info->zs_channel, info->zs_channel->curregs); | |
856 | ||
0905780a | 857 | spin_unlock_irqrestore(&zs_lock, flags); |
1da177e4 LT |
858 | } |
859 | ||
860 | static void rs_flush_chars(struct tty_struct *tty) | |
861 | { | |
862 | struct dec_serial *info = (struct dec_serial *)tty->driver_data; | |
863 | unsigned long flags; | |
864 | ||
865 | if (serial_paranoia_check(info, tty->name, "rs_flush_chars")) | |
866 | return; | |
867 | ||
868 | if (info->xmit_cnt <= 0 || tty->stopped || info->tx_stopped || | |
869 | !info->xmit_buf) | |
870 | return; | |
871 | ||
872 | /* Enable transmitter */ | |
0905780a | 873 | spin_lock_irqsave(&zs_lock, flags); |
1da177e4 | 874 | transmit_chars(info); |
0905780a | 875 | spin_unlock_irqrestore(&zs_lock, flags); |
1da177e4 LT |
876 | } |
877 | ||
878 | static int rs_write(struct tty_struct * tty, | |
879 | const unsigned char *buf, int count) | |
880 | { | |
881 | int c, total = 0; | |
882 | struct dec_serial *info = (struct dec_serial *)tty->driver_data; | |
883 | unsigned long flags; | |
884 | ||
885 | if (serial_paranoia_check(info, tty->name, "rs_write")) | |
886 | return 0; | |
887 | ||
888 | if (!tty || !info->xmit_buf) | |
889 | return 0; | |
890 | ||
1da177e4 | 891 | while (1) { |
0905780a | 892 | spin_lock_irqsave(&zs_lock, flags); |
1da177e4 LT |
893 | c = min(count, min(SERIAL_XMIT_SIZE - info->xmit_cnt - 1, |
894 | SERIAL_XMIT_SIZE - info->xmit_head)); | |
895 | if (c <= 0) | |
896 | break; | |
897 | ||
0905780a | 898 | memcpy(info->xmit_buf + info->xmit_head, buf, c); |
1da177e4 LT |
899 | info->xmit_head = (info->xmit_head + c) & (SERIAL_XMIT_SIZE-1); |
900 | info->xmit_cnt += c; | |
0905780a | 901 | spin_unlock_irqrestore(&zs_lock, flags); |
1da177e4 LT |
902 | buf += c; |
903 | count -= c; | |
904 | total += c; | |
905 | } | |
906 | ||
907 | if (info->xmit_cnt && !tty->stopped && !info->tx_stopped | |
908 | && !info->tx_active) | |
909 | transmit_chars(info); | |
0905780a | 910 | spin_unlock_irqrestore(&zs_lock, flags); |
1da177e4 LT |
911 | return total; |
912 | } | |
913 | ||
914 | static int rs_write_room(struct tty_struct *tty) | |
915 | { | |
916 | struct dec_serial *info = (struct dec_serial *)tty->driver_data; | |
917 | int ret; | |
918 | ||
919 | if (serial_paranoia_check(info, tty->name, "rs_write_room")) | |
920 | return 0; | |
921 | ret = SERIAL_XMIT_SIZE - info->xmit_cnt - 1; | |
922 | if (ret < 0) | |
923 | ret = 0; | |
924 | return ret; | |
925 | } | |
926 | ||
927 | static int rs_chars_in_buffer(struct tty_struct *tty) | |
928 | { | |
929 | struct dec_serial *info = (struct dec_serial *)tty->driver_data; | |
930 | ||
931 | if (serial_paranoia_check(info, tty->name, "rs_chars_in_buffer")) | |
932 | return 0; | |
933 | return info->xmit_cnt; | |
934 | } | |
935 | ||
936 | static void rs_flush_buffer(struct tty_struct *tty) | |
937 | { | |
938 | struct dec_serial *info = (struct dec_serial *)tty->driver_data; | |
939 | ||
940 | if (serial_paranoia_check(info, tty->name, "rs_flush_buffer")) | |
941 | return; | |
0905780a | 942 | spin_lock_irq(&zs_lock); |
1da177e4 | 943 | info->xmit_cnt = info->xmit_head = info->xmit_tail = 0; |
0905780a | 944 | spin_unlock_irq(&zs_lock); |
1da177e4 LT |
945 | tty_wakeup(tty); |
946 | } | |
947 | ||
948 | /* | |
949 | * ------------------------------------------------------------ | |
950 | * rs_throttle() | |
951 | * | |
952 | * This routine is called by the upper-layer tty layer to signal that | |
953 | * incoming characters should be throttled. | |
954 | * ------------------------------------------------------------ | |
955 | */ | |
956 | static void rs_throttle(struct tty_struct * tty) | |
957 | { | |
958 | struct dec_serial *info = (struct dec_serial *)tty->driver_data; | |
959 | unsigned long flags; | |
960 | ||
961 | #ifdef SERIAL_DEBUG_THROTTLE | |
962 | char buf[64]; | |
963 | ||
964 | printk("throttle %s: %d....\n", _tty_name(tty, buf), | |
965 | tty->ldisc.chars_in_buffer(tty)); | |
966 | #endif | |
967 | ||
968 | if (serial_paranoia_check(info, tty->name, "rs_throttle")) | |
969 | return; | |
970 | ||
971 | if (I_IXOFF(tty)) { | |
0905780a | 972 | spin_lock_irqsave(&zs_lock, flags); |
1da177e4 LT |
973 | info->x_char = STOP_CHAR(tty); |
974 | if (!info->tx_active) | |
975 | transmit_chars(info); | |
0905780a | 976 | spin_unlock_irqrestore(&zs_lock, flags); |
1da177e4 LT |
977 | } |
978 | ||
979 | if (C_CRTSCTS(tty)) { | |
980 | zs_rtsdtr(info, RTS, 0); | |
981 | } | |
982 | } | |
983 | ||
984 | static void rs_unthrottle(struct tty_struct * tty) | |
985 | { | |
986 | struct dec_serial *info = (struct dec_serial *)tty->driver_data; | |
987 | unsigned long flags; | |
988 | ||
989 | #ifdef SERIAL_DEBUG_THROTTLE | |
990 | char buf[64]; | |
991 | ||
992 | printk("unthrottle %s: %d....\n", _tty_name(tty, buf), | |
993 | tty->ldisc.chars_in_buffer(tty)); | |
994 | #endif | |
995 | ||
996 | if (serial_paranoia_check(info, tty->name, "rs_unthrottle")) | |
997 | return; | |
998 | ||
999 | if (I_IXOFF(tty)) { | |
0905780a | 1000 | spin_lock_irqsave(&zs_lock, flags); |
1da177e4 LT |
1001 | if (info->x_char) |
1002 | info->x_char = 0; | |
1003 | else { | |
1004 | info->x_char = START_CHAR(tty); | |
1005 | if (!info->tx_active) | |
1006 | transmit_chars(info); | |
1007 | } | |
0905780a | 1008 | spin_unlock_irqrestore(&zs_lock, flags); |
1da177e4 LT |
1009 | } |
1010 | ||
1011 | if (C_CRTSCTS(tty)) { | |
1012 | zs_rtsdtr(info, RTS, 1); | |
1013 | } | |
1014 | } | |
1015 | ||
1016 | /* | |
1017 | * ------------------------------------------------------------ | |
1018 | * rs_ioctl() and friends | |
1019 | * ------------------------------------------------------------ | |
1020 | */ | |
1021 | ||
1022 | static int get_serial_info(struct dec_serial * info, | |
1023 | struct serial_struct * retinfo) | |
1024 | { | |
1025 | struct serial_struct tmp; | |
1026 | ||
1027 | if (!retinfo) | |
1028 | return -EFAULT; | |
1029 | memset(&tmp, 0, sizeof(tmp)); | |
1030 | tmp.type = info->type; | |
1031 | tmp.line = info->line; | |
1032 | tmp.port = info->port; | |
1033 | tmp.irq = info->irq; | |
1034 | tmp.flags = info->flags; | |
1035 | tmp.baud_base = info->baud_base; | |
1036 | tmp.close_delay = info->close_delay; | |
1037 | tmp.closing_wait = info->closing_wait; | |
1038 | tmp.custom_divisor = info->custom_divisor; | |
1039 | return copy_to_user(retinfo,&tmp,sizeof(*retinfo)) ? -EFAULT : 0; | |
1040 | } | |
1041 | ||
1042 | static int set_serial_info(struct dec_serial * info, | |
1043 | struct serial_struct * new_info) | |
1044 | { | |
1045 | struct serial_struct new_serial; | |
1046 | struct dec_serial old_info; | |
1047 | int retval = 0; | |
1048 | ||
1049 | if (!new_info) | |
1050 | return -EFAULT; | |
1051 | copy_from_user(&new_serial,new_info,sizeof(new_serial)); | |
1052 | old_info = *info; | |
1053 | ||
1054 | if (!capable(CAP_SYS_ADMIN)) { | |
1055 | if ((new_serial.baud_base != info->baud_base) || | |
1056 | (new_serial.type != info->type) || | |
1057 | (new_serial.close_delay != info->close_delay) || | |
1058 | ((new_serial.flags & ~ZILOG_USR_MASK) != | |
1059 | (info->flags & ~ZILOG_USR_MASK))) | |
1060 | return -EPERM; | |
1061 | info->flags = ((info->flags & ~ZILOG_USR_MASK) | | |
1062 | (new_serial.flags & ZILOG_USR_MASK)); | |
1063 | info->custom_divisor = new_serial.custom_divisor; | |
1064 | goto check_and_exit; | |
1065 | } | |
1066 | ||
1067 | if (info->count > 1) | |
1068 | return -EBUSY; | |
1069 | ||
1070 | /* | |
1071 | * OK, past this point, all the error checking has been done. | |
1072 | * At this point, we start making changes..... | |
1073 | */ | |
1074 | ||
1075 | info->baud_base = new_serial.baud_base; | |
1076 | info->flags = ((info->flags & ~ZILOG_FLAGS) | | |
1077 | (new_serial.flags & ZILOG_FLAGS)); | |
1078 | info->type = new_serial.type; | |
1079 | info->close_delay = new_serial.close_delay; | |
1080 | info->closing_wait = new_serial.closing_wait; | |
1081 | ||
1082 | check_and_exit: | |
1083 | retval = zs_startup(info); | |
1084 | return retval; | |
1085 | } | |
1086 | ||
1087 | /* | |
1088 | * get_lsr_info - get line status register info | |
1089 | * | |
1090 | * Purpose: Let user call ioctl() to get info when the UART physically | |
1091 | * is emptied. On bus types like RS485, the transmitter must | |
1092 | * release the bus after transmitting. This must be done when | |
1093 | * the transmit shift register is empty, not be done when the | |
1094 | * transmit holding register is empty. This functionality | |
1095 | * allows an RS485 driver to be written in user space. | |
1096 | */ | |
1097 | static int get_lsr_info(struct dec_serial * info, unsigned int *value) | |
1098 | { | |
1099 | unsigned char status; | |
1100 | ||
0905780a | 1101 | spin_lock(&zs_lock); |
1da177e4 | 1102 | status = read_zsreg(info->zs_channel, 0); |
0905780a | 1103 | spin_unlock_irq(&zs_lock); |
1da177e4 LT |
1104 | put_user(status,value); |
1105 | return 0; | |
1106 | } | |
1107 | ||
1108 | static int rs_tiocmget(struct tty_struct *tty, struct file *file) | |
1109 | { | |
1110 | struct dec_serial * info = (struct dec_serial *)tty->driver_data; | |
1111 | unsigned char control, status_a, status_b; | |
1112 | unsigned int result; | |
1113 | ||
1114 | if (info->hook) | |
1115 | return -ENODEV; | |
1116 | ||
1117 | if (serial_paranoia_check(info, tty->name, __FUNCTION__)) | |
1118 | return -ENODEV; | |
1119 | ||
1120 | if (tty->flags & (1 << TTY_IO_ERROR)) | |
1121 | return -EIO; | |
1122 | ||
1123 | if (info->zs_channel == info->zs_chan_a) | |
1124 | result = 0; | |
1125 | else { | |
0905780a | 1126 | spin_lock(&zs_lock); |
1da177e4 LT |
1127 | control = info->zs_chan_a->curregs[5]; |
1128 | status_a = read_zsreg(info->zs_chan_a, 0); | |
1129 | status_b = read_zsreg(info->zs_channel, 0); | |
0905780a | 1130 | spin_unlock_irq(&zs_lock); |
1da177e4 LT |
1131 | result = ((control & RTS) ? TIOCM_RTS: 0) |
1132 | | ((control & DTR) ? TIOCM_DTR: 0) | |
1133 | | ((status_b & DCD) ? TIOCM_CAR: 0) | |
1134 | | ((status_a & DCD) ? TIOCM_RNG: 0) | |
1135 | | ((status_a & SYNC_HUNT) ? TIOCM_DSR: 0) | |
1136 | | ((status_b & CTS) ? TIOCM_CTS: 0); | |
1137 | } | |
1138 | return result; | |
1139 | } | |
1140 | ||
1141 | static int rs_tiocmset(struct tty_struct *tty, struct file *file, | |
1142 | unsigned int set, unsigned int clear) | |
1143 | { | |
1144 | struct dec_serial * info = (struct dec_serial *)tty->driver_data; | |
1da177e4 LT |
1145 | |
1146 | if (info->hook) | |
1147 | return -ENODEV; | |
1148 | ||
1149 | if (serial_paranoia_check(info, tty->name, __FUNCTION__)) | |
1150 | return -ENODEV; | |
1151 | ||
1152 | if (tty->flags & (1 << TTY_IO_ERROR)) | |
1153 | return -EIO; | |
1154 | ||
1155 | if (info->zs_channel == info->zs_chan_a) | |
1156 | return 0; | |
1157 | ||
0905780a | 1158 | spin_lock(&zs_lock); |
1da177e4 LT |
1159 | if (set & TIOCM_RTS) |
1160 | info->zs_chan_a->curregs[5] |= RTS; | |
1161 | if (set & TIOCM_DTR) | |
1162 | info->zs_chan_a->curregs[5] |= DTR; | |
1163 | if (clear & TIOCM_RTS) | |
1164 | info->zs_chan_a->curregs[5] &= ~RTS; | |
1165 | if (clear & TIOCM_DTR) | |
1166 | info->zs_chan_a->curregs[5] &= ~DTR; | |
1167 | write_zsreg(info->zs_chan_a, 5, info->zs_chan_a->curregs[5]); | |
0905780a | 1168 | spin_unlock_irq(&zs_lock); |
1da177e4 LT |
1169 | return 0; |
1170 | } | |
1171 | ||
1172 | /* | |
1173 | * rs_break - turn transmit break condition on/off | |
1174 | */ | |
1175 | static void rs_break(struct tty_struct *tty, int break_state) | |
1176 | { | |
1177 | struct dec_serial *info = (struct dec_serial *) tty->driver_data; | |
1178 | unsigned long flags; | |
1179 | ||
1180 | if (serial_paranoia_check(info, tty->name, "rs_break")) | |
1181 | return; | |
1182 | if (!info->port) | |
1183 | return; | |
1184 | ||
0905780a | 1185 | spin_lock_irqsave(&zs_lock, flags); |
1da177e4 LT |
1186 | if (break_state == -1) |
1187 | info->zs_channel->curregs[5] |= SND_BRK; | |
1188 | else | |
1189 | info->zs_channel->curregs[5] &= ~SND_BRK; | |
1190 | write_zsreg(info->zs_channel, 5, info->zs_channel->curregs[5]); | |
0905780a | 1191 | spin_unlock_irqrestore(&zs_lock, flags); |
1da177e4 LT |
1192 | } |
1193 | ||
1194 | static int rs_ioctl(struct tty_struct *tty, struct file * file, | |
1195 | unsigned int cmd, unsigned long arg) | |
1196 | { | |
1da177e4 LT |
1197 | struct dec_serial * info = (struct dec_serial *)tty->driver_data; |
1198 | ||
1199 | if (info->hook) | |
1200 | return -ENODEV; | |
1201 | ||
1202 | if (serial_paranoia_check(info, tty->name, "rs_ioctl")) | |
1203 | return -ENODEV; | |
1204 | ||
1205 | if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) && | |
1206 | (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGWILD) && | |
1207 | (cmd != TIOCSERSWILD) && (cmd != TIOCSERGSTRUCT)) { | |
1208 | if (tty->flags & (1 << TTY_IO_ERROR)) | |
1209 | return -EIO; | |
1210 | } | |
1211 | ||
1212 | switch (cmd) { | |
1213 | case TIOCGSERIAL: | |
1214 | if (!access_ok(VERIFY_WRITE, (void *)arg, | |
1215 | sizeof(struct serial_struct))) | |
1216 | return -EFAULT; | |
1217 | return get_serial_info(info, (struct serial_struct *)arg); | |
1218 | ||
1219 | case TIOCSSERIAL: | |
1220 | return set_serial_info(info, (struct serial_struct *)arg); | |
1221 | ||
1222 | case TIOCSERGETLSR: /* Get line status register */ | |
1223 | if (!access_ok(VERIFY_WRITE, (void *)arg, | |
1224 | sizeof(unsigned int))) | |
1225 | return -EFAULT; | |
1226 | return get_lsr_info(info, (unsigned int *)arg); | |
1227 | ||
1228 | case TIOCSERGSTRUCT: | |
1229 | if (!access_ok(VERIFY_WRITE, (void *)arg, | |
1230 | sizeof(struct dec_serial))) | |
1231 | return -EFAULT; | |
1232 | copy_from_user((struct dec_serial *)arg, info, | |
1233 | sizeof(struct dec_serial)); | |
1234 | return 0; | |
1235 | ||
1236 | default: | |
1237 | return -ENOIOCTLCMD; | |
1238 | } | |
1239 | return 0; | |
1240 | } | |
1241 | ||
1242 | static void rs_set_termios(struct tty_struct *tty, struct termios *old_termios) | |
1243 | { | |
1244 | struct dec_serial *info = (struct dec_serial *)tty->driver_data; | |
1245 | int was_stopped; | |
1246 | ||
1247 | if (tty->termios->c_cflag == old_termios->c_cflag) | |
1248 | return; | |
1249 | was_stopped = info->tx_stopped; | |
1250 | ||
1251 | change_speed(info); | |
1252 | ||
1253 | if (was_stopped && !info->tx_stopped) | |
1254 | rs_start(tty); | |
1255 | } | |
1256 | ||
1257 | /* | |
1258 | * ------------------------------------------------------------ | |
1259 | * rs_close() | |
1260 | * | |
1261 | * This routine is called when the serial port gets closed. | |
1262 | * Wait for the last remaining data to be sent. | |
1263 | * ------------------------------------------------------------ | |
1264 | */ | |
1265 | static void rs_close(struct tty_struct *tty, struct file * filp) | |
1266 | { | |
1267 | struct dec_serial * info = (struct dec_serial *)tty->driver_data; | |
1268 | unsigned long flags; | |
1269 | ||
1270 | if (!info || serial_paranoia_check(info, tty->name, "rs_close")) | |
1271 | return; | |
1272 | ||
0905780a | 1273 | spin_lock_irqsave(&zs_lock, flags); |
1da177e4 LT |
1274 | |
1275 | if (tty_hung_up_p(filp)) { | |
0905780a | 1276 | spin_unlock_irqrestore(&zs_lock, flags); |
1da177e4 LT |
1277 | return; |
1278 | } | |
1279 | ||
1280 | #ifdef SERIAL_DEBUG_OPEN | |
1281 | printk("rs_close ttyS%d, count = %d\n", info->line, info->count); | |
1282 | #endif | |
1283 | if ((tty->count == 1) && (info->count != 1)) { | |
1284 | /* | |
1285 | * Uh, oh. tty->count is 1, which means that the tty | |
1286 | * structure will be freed. Info->count should always | |
1287 | * be one in these conditions. If it's greater than | |
1288 | * one, we've got real problems, since it means the | |
1289 | * serial port won't be shutdown. | |
1290 | */ | |
1291 | printk("rs_close: bad serial port count; tty->count is 1, " | |
1292 | "info->count is %d\n", info->count); | |
1293 | info->count = 1; | |
1294 | } | |
1295 | if (--info->count < 0) { | |
1296 | printk("rs_close: bad serial port count for ttyS%d: %d\n", | |
1297 | info->line, info->count); | |
1298 | info->count = 0; | |
1299 | } | |
1300 | if (info->count) { | |
0905780a | 1301 | spin_unlock_irqrestore(&zs_lock, flags); |
1da177e4 LT |
1302 | return; |
1303 | } | |
1304 | info->flags |= ZILOG_CLOSING; | |
1305 | /* | |
1306 | * Now we wait for the transmit buffer to clear; and we notify | |
1307 | * the line discipline to only process XON/XOFF characters. | |
1308 | */ | |
1309 | tty->closing = 1; | |
1310 | if (info->closing_wait != ZILOG_CLOSING_WAIT_NONE) | |
1311 | tty_wait_until_sent(tty, info->closing_wait); | |
1312 | /* | |
1313 | * At this point we stop accepting input. To do this, we | |
1314 | * disable the receiver and receive interrupts. | |
1315 | */ | |
1316 | info->zs_channel->curregs[3] &= ~RxENABLE; | |
1317 | write_zsreg(info->zs_channel, 3, info->zs_channel->curregs[3]); | |
1318 | info->zs_channel->curregs[1] = 0; /* disable any rx ints */ | |
1319 | write_zsreg(info->zs_channel, 1, info->zs_channel->curregs[1]); | |
1320 | ZS_CLEARFIFO(info->zs_channel); | |
1321 | if (info->flags & ZILOG_INITIALIZED) { | |
1322 | /* | |
1323 | * Before we drop DTR, make sure the SCC transmitter | |
1324 | * has completely drained. | |
1325 | */ | |
1326 | rs_wait_until_sent(tty, info->timeout); | |
1327 | } | |
1328 | ||
1329 | shutdown(info); | |
1330 | if (tty->driver->flush_buffer) | |
1331 | tty->driver->flush_buffer(tty); | |
1332 | tty_ldisc_flush(tty); | |
1333 | tty->closing = 0; | |
1334 | info->event = 0; | |
1335 | info->tty = 0; | |
1336 | if (info->blocked_open) { | |
1337 | if (info->close_delay) { | |
1338 | msleep_interruptible(jiffies_to_msecs(info->close_delay)); | |
1339 | } | |
1340 | wake_up_interruptible(&info->open_wait); | |
1341 | } | |
1342 | info->flags &= ~(ZILOG_NORMAL_ACTIVE|ZILOG_CLOSING); | |
1343 | wake_up_interruptible(&info->close_wait); | |
0905780a | 1344 | spin_unlock_irqrestore(&zs_lock, flags); |
1da177e4 LT |
1345 | } |
1346 | ||
1347 | /* | |
1348 | * rs_wait_until_sent() --- wait until the transmitter is empty | |
1349 | */ | |
1350 | static void rs_wait_until_sent(struct tty_struct *tty, int timeout) | |
1351 | { | |
1352 | struct dec_serial *info = (struct dec_serial *) tty->driver_data; | |
1353 | unsigned long orig_jiffies; | |
1354 | int char_time; | |
1355 | ||
1356 | if (serial_paranoia_check(info, tty->name, "rs_wait_until_sent")) | |
1357 | return; | |
1358 | ||
1359 | orig_jiffies = jiffies; | |
1360 | /* | |
1361 | * Set the check interval to be 1/5 of the estimated time to | |
1362 | * send a single character, and make it at least 1. The check | |
1363 | * interval should also be less than the timeout. | |
1364 | */ | |
1365 | char_time = (info->timeout - HZ/50) / info->xmit_fifo_size; | |
1366 | char_time = char_time / 5; | |
1367 | if (char_time == 0) | |
1368 | char_time = 1; | |
1369 | if (timeout) | |
1370 | char_time = min(char_time, timeout); | |
1371 | while ((read_zsreg(info->zs_channel, 1) & Tx_BUF_EMP) == 0) { | |
1372 | msleep_interruptible(jiffies_to_msecs(char_time)); | |
1373 | if (signal_pending(current)) | |
1374 | break; | |
1375 | if (timeout && time_after(jiffies, orig_jiffies + timeout)) | |
1376 | break; | |
1377 | } | |
1378 | current->state = TASK_RUNNING; | |
1379 | } | |
1380 | ||
1381 | /* | |
1382 | * rs_hangup() --- called by tty_hangup() when a hangup is signaled. | |
1383 | */ | |
0905780a | 1384 | static void rs_hangup(struct tty_struct *tty) |
1da177e4 LT |
1385 | { |
1386 | struct dec_serial * info = (struct dec_serial *)tty->driver_data; | |
1387 | ||
1388 | if (serial_paranoia_check(info, tty->name, "rs_hangup")) | |
1389 | return; | |
1390 | ||
1391 | rs_flush_buffer(tty); | |
1392 | shutdown(info); | |
1393 | info->event = 0; | |
1394 | info->count = 0; | |
1395 | info->flags &= ~ZILOG_NORMAL_ACTIVE; | |
1396 | info->tty = 0; | |
1397 | wake_up_interruptible(&info->open_wait); | |
1398 | } | |
1399 | ||
1400 | /* | |
1401 | * ------------------------------------------------------------ | |
1402 | * rs_open() and friends | |
1403 | * ------------------------------------------------------------ | |
1404 | */ | |
1405 | static int block_til_ready(struct tty_struct *tty, struct file * filp, | |
1406 | struct dec_serial *info) | |
1407 | { | |
1408 | DECLARE_WAITQUEUE(wait, current); | |
1409 | int retval; | |
1410 | int do_clocal = 0; | |
1411 | ||
1412 | /* | |
1413 | * If the device is in the middle of being closed, then block | |
1414 | * until it's done, and then try again. | |
1415 | */ | |
1416 | if (info->flags & ZILOG_CLOSING) { | |
1417 | interruptible_sleep_on(&info->close_wait); | |
1418 | #ifdef SERIAL_DO_RESTART | |
1419 | return ((info->flags & ZILOG_HUP_NOTIFY) ? | |
1420 | -EAGAIN : -ERESTARTSYS); | |
1421 | #else | |
1422 | return -EAGAIN; | |
1423 | #endif | |
1424 | } | |
1425 | ||
1426 | /* | |
1427 | * If non-blocking mode is set, or the port is not enabled, | |
1428 | * then make the check up front and then exit. | |
1429 | */ | |
1430 | if ((filp->f_flags & O_NONBLOCK) || | |
1431 | (tty->flags & (1 << TTY_IO_ERROR))) { | |
1432 | info->flags |= ZILOG_NORMAL_ACTIVE; | |
1433 | return 0; | |
1434 | } | |
1435 | ||
1436 | if (tty->termios->c_cflag & CLOCAL) | |
1437 | do_clocal = 1; | |
1438 | ||
1439 | /* | |
1440 | * Block waiting for the carrier detect and the line to become | |
1441 | * free (i.e., not in use by the callout). While we are in | |
1442 | * this loop, info->count is dropped by one, so that | |
1443 | * rs_close() knows when to free things. We restore it upon | |
1444 | * exit, either normal or abnormal. | |
1445 | */ | |
1446 | retval = 0; | |
1447 | add_wait_queue(&info->open_wait, &wait); | |
1448 | #ifdef SERIAL_DEBUG_OPEN | |
1449 | printk("block_til_ready before block: ttyS%d, count = %d\n", | |
1450 | info->line, info->count); | |
1451 | #endif | |
0905780a | 1452 | spin_lock(&zs_lock); |
1da177e4 LT |
1453 | if (!tty_hung_up_p(filp)) |
1454 | info->count--; | |
0905780a | 1455 | spin_unlock_irq(&zs_lock); |
1da177e4 LT |
1456 | info->blocked_open++; |
1457 | while (1) { | |
0905780a | 1458 | spin_lock(&zs_lock); |
1da177e4 LT |
1459 | if (tty->termios->c_cflag & CBAUD) |
1460 | zs_rtsdtr(info, RTS | DTR, 1); | |
0905780a | 1461 | spin_unlock_irq(&zs_lock); |
1da177e4 LT |
1462 | set_current_state(TASK_INTERRUPTIBLE); |
1463 | if (tty_hung_up_p(filp) || | |
1464 | !(info->flags & ZILOG_INITIALIZED)) { | |
1465 | #ifdef SERIAL_DO_RESTART | |
1466 | if (info->flags & ZILOG_HUP_NOTIFY) | |
1467 | retval = -EAGAIN; | |
1468 | else | |
1469 | retval = -ERESTARTSYS; | |
1470 | #else | |
1471 | retval = -EAGAIN; | |
1472 | #endif | |
1473 | break; | |
1474 | } | |
1475 | if (!(info->flags & ZILOG_CLOSING) && | |
1476 | (do_clocal || (read_zsreg(info->zs_channel, 0) & DCD))) | |
1477 | break; | |
1478 | if (signal_pending(current)) { | |
1479 | retval = -ERESTARTSYS; | |
1480 | break; | |
1481 | } | |
1482 | #ifdef SERIAL_DEBUG_OPEN | |
1483 | printk("block_til_ready blocking: ttyS%d, count = %d\n", | |
1484 | info->line, info->count); | |
1485 | #endif | |
1486 | schedule(); | |
1487 | } | |
1488 | current->state = TASK_RUNNING; | |
1489 | remove_wait_queue(&info->open_wait, &wait); | |
1490 | if (!tty_hung_up_p(filp)) | |
1491 | info->count++; | |
1492 | info->blocked_open--; | |
1493 | #ifdef SERIAL_DEBUG_OPEN | |
1494 | printk("block_til_ready after blocking: ttyS%d, count = %d\n", | |
1495 | info->line, info->count); | |
1496 | #endif | |
1497 | if (retval) | |
1498 | return retval; | |
1499 | info->flags |= ZILOG_NORMAL_ACTIVE; | |
1500 | return 0; | |
1501 | } | |
1502 | ||
1503 | /* | |
1504 | * This routine is called whenever a serial port is opened. It | |
1505 | * enables interrupts for a serial port, linking in its ZILOG structure into | |
1506 | * the IRQ chain. It also performs the serial-specific | |
1507 | * initialization for the tty structure. | |
1508 | */ | |
0905780a | 1509 | static int rs_open(struct tty_struct *tty, struct file * filp) |
1da177e4 LT |
1510 | { |
1511 | struct dec_serial *info; | |
1512 | int retval, line; | |
1513 | ||
1514 | line = tty->index; | |
1515 | if ((line < 0) || (line >= zs_channels_found)) | |
1516 | return -ENODEV; | |
1517 | info = zs_soft + line; | |
1518 | ||
1519 | if (info->hook) | |
1520 | return -ENODEV; | |
1521 | ||
1522 | if (serial_paranoia_check(info, tty->name, "rs_open")) | |
1523 | return -ENODEV; | |
1524 | #ifdef SERIAL_DEBUG_OPEN | |
1525 | printk("rs_open %s, count = %d\n", tty->name, info->count); | |
1526 | #endif | |
1527 | ||
1528 | info->count++; | |
1529 | tty->driver_data = info; | |
1530 | info->tty = tty; | |
1531 | ||
1532 | /* | |
1533 | * If the port is the middle of closing, bail out now | |
1534 | */ | |
1535 | if (tty_hung_up_p(filp) || | |
1536 | (info->flags & ZILOG_CLOSING)) { | |
1537 | if (info->flags & ZILOG_CLOSING) | |
1538 | interruptible_sleep_on(&info->close_wait); | |
1539 | #ifdef SERIAL_DO_RESTART | |
1540 | return ((info->flags & ZILOG_HUP_NOTIFY) ? | |
1541 | -EAGAIN : -ERESTARTSYS); | |
1542 | #else | |
1543 | return -EAGAIN; | |
1544 | #endif | |
1545 | } | |
1546 | ||
1547 | /* | |
1548 | * Start up serial port | |
1549 | */ | |
1550 | retval = zs_startup(info); | |
1551 | if (retval) | |
1552 | return retval; | |
1553 | ||
1554 | retval = block_til_ready(tty, filp, info); | |
1555 | if (retval) { | |
1556 | #ifdef SERIAL_DEBUG_OPEN | |
1557 | printk("rs_open returning after block_til_ready with %d\n", | |
1558 | retval); | |
1559 | #endif | |
1560 | return retval; | |
1561 | } | |
1562 | ||
1563 | #ifdef CONFIG_SERIAL_DEC_CONSOLE | |
1564 | if (sercons.cflag && sercons.index == line) { | |
1565 | tty->termios->c_cflag = sercons.cflag; | |
1566 | sercons.cflag = 0; | |
1567 | change_speed(info); | |
1568 | } | |
1569 | #endif | |
1570 | ||
1571 | #ifdef SERIAL_DEBUG_OPEN | |
1572 | printk("rs_open %s successful...", tty->name); | |
1573 | #endif | |
1574 | /* tty->low_latency = 1; */ | |
1575 | return 0; | |
1576 | } | |
1577 | ||
1578 | /* Finally, routines used to initialize the serial driver. */ | |
1579 | ||
1580 | static void __init show_serial_version(void) | |
1581 | { | |
1582 | printk("DECstation Z8530 serial driver version 0.09\n"); | |
1583 | } | |
1584 | ||
1585 | /* Initialize Z8530s zs_channels | |
1586 | */ | |
1587 | ||
1588 | static void __init probe_sccs(void) | |
1589 | { | |
1590 | struct dec_serial **pp; | |
1591 | int i, n, n_chips = 0, n_channels, chip, channel; | |
1592 | unsigned long flags; | |
1593 | ||
1594 | /* | |
1595 | * did we get here by accident? | |
1596 | */ | |
1597 | if(!BUS_PRESENT) { | |
1598 | printk("Not on JUNKIO machine, skipping probe_sccs\n"); | |
1599 | return; | |
1600 | } | |
1601 | ||
1da177e4 LT |
1602 | switch(mips_machtype) { |
1603 | #ifdef CONFIG_MACH_DECSTATION | |
1604 | case MACH_DS5000_2X0: | |
1605 | case MACH_DS5900: | |
1da177e4 LT |
1606 | n_chips = 2; |
1607 | zs_parms = &ds_parms; | |
1608 | zs_parms->irq0 = dec_interrupt[DEC_IRQ_SCC0]; | |
1609 | zs_parms->irq1 = dec_interrupt[DEC_IRQ_SCC1]; | |
1610 | break; | |
1611 | case MACH_DS5000_1XX: | |
1da177e4 LT |
1612 | n_chips = 2; |
1613 | zs_parms = &ds_parms; | |
1614 | zs_parms->irq0 = dec_interrupt[DEC_IRQ_SCC0]; | |
1615 | zs_parms->irq1 = dec_interrupt[DEC_IRQ_SCC1]; | |
1616 | break; | |
1617 | case MACH_DS5000_XX: | |
1da177e4 LT |
1618 | n_chips = 1; |
1619 | zs_parms = &ds_parms; | |
1620 | zs_parms->irq0 = dec_interrupt[DEC_IRQ_SCC0]; | |
1621 | break; | |
1622 | #endif | |
1623 | default: | |
1624 | panic("zs: unsupported bus"); | |
1625 | } | |
1626 | if (!zs_parms) | |
1627 | panic("zs: uninitialized parms"); | |
1628 | ||
1629 | pp = &zs_chain; | |
1630 | ||
1631 | n_channels = 0; | |
1632 | ||
1633 | for (chip = 0; chip < n_chips; chip++) { | |
1634 | for (channel = 0; channel <= 1; channel++) { | |
1635 | /* | |
1636 | * The sccs reside on the high byte of the 16 bit IOBUS | |
1637 | */ | |
1638 | zs_channels[n_channels].control = | |
a5fc9c0b | 1639 | (volatile void *)CKSEG1ADDR(dec_kn_slot_base + |
1da177e4 LT |
1640 | (0 == chip ? zs_parms->scc0 : zs_parms->scc1) + |
1641 | (0 == channel ? zs_parms->channel_a_offset : | |
a5fc9c0b | 1642 | zs_parms->channel_b_offset)); |
1da177e4 LT |
1643 | zs_channels[n_channels].data = |
1644 | zs_channels[n_channels].control + 4; | |
1645 | ||
1646 | #ifndef CONFIG_SERIAL_DEC_CONSOLE | |
1647 | /* | |
1648 | * We're called early and memory managment isn't up, yet. | |
fb911ee8 | 1649 | * Thus request_region would fail. |
1da177e4 LT |
1650 | */ |
1651 | if (!request_region((unsigned long) | |
1652 | zs_channels[n_channels].control, | |
1653 | ZS_CHAN_IO_SIZE, "SCC")) | |
1654 | panic("SCC I/O region is not free"); | |
1655 | #endif | |
1656 | zs_soft[n_channels].zs_channel = &zs_channels[n_channels]; | |
1657 | /* HACK alert! */ | |
1658 | if (!(chip & 1)) | |
1659 | zs_soft[n_channels].irq = zs_parms->irq0; | |
1660 | else | |
1661 | zs_soft[n_channels].irq = zs_parms->irq1; | |
1662 | ||
1663 | /* | |
1664 | * Identification of channel A. Location of channel A | |
1665 | * inside chip depends on mapping of internal address | |
1666 | * the chip decodes channels by. | |
1667 | * CHANNEL_A_NR returns either 0 (in case of | |
1668 | * DECstations) or 1 (in case of Baget). | |
1669 | */ | |
1670 | if (CHANNEL_A_NR == channel) | |
1671 | zs_soft[n_channels].zs_chan_a = | |
1672 | &zs_channels[n_channels+1-2*CHANNEL_A_NR]; | |
1673 | else | |
1674 | zs_soft[n_channels].zs_chan_a = | |
1675 | &zs_channels[n_channels]; | |
1676 | ||
1677 | *pp = &zs_soft[n_channels]; | |
1678 | pp = &zs_soft[n_channels].zs_next; | |
1679 | n_channels++; | |
1680 | } | |
1681 | } | |
1682 | ||
1683 | *pp = 0; | |
1684 | zs_channels_found = n_channels; | |
1685 | ||
1686 | for (n = 0; n < zs_channels_found; n++) { | |
1687 | for (i = 0; i < 16; i++) { | |
1688 | zs_soft[n].zs_channel->curregs[i] = zs_init_regs[i]; | |
1689 | } | |
1690 | } | |
1691 | ||
0905780a | 1692 | spin_lock_irqsave(&zs_lock, flags); |
1da177e4 LT |
1693 | for (n = 0; n < zs_channels_found; n++) { |
1694 | if (n % 2 == 0) { | |
1695 | write_zsreg(zs_soft[n].zs_chan_a, R9, FHWRES); | |
1696 | udelay(10); | |
1697 | write_zsreg(zs_soft[n].zs_chan_a, R9, 0); | |
1698 | } | |
1699 | load_zsregs(zs_soft[n].zs_channel, | |
1700 | zs_soft[n].zs_channel->curregs); | |
1701 | } | |
0905780a | 1702 | spin_unlock_irqrestore(&zs_lock, flags); |
1da177e4 LT |
1703 | } |
1704 | ||
1705 | static struct tty_operations serial_ops = { | |
1706 | .open = rs_open, | |
1707 | .close = rs_close, | |
1708 | .write = rs_write, | |
1709 | .flush_chars = rs_flush_chars, | |
1710 | .write_room = rs_write_room, | |
1711 | .chars_in_buffer = rs_chars_in_buffer, | |
1712 | .flush_buffer = rs_flush_buffer, | |
1713 | .ioctl = rs_ioctl, | |
1714 | .throttle = rs_throttle, | |
1715 | .unthrottle = rs_unthrottle, | |
1716 | .set_termios = rs_set_termios, | |
1717 | .stop = rs_stop, | |
1718 | .start = rs_start, | |
1719 | .hangup = rs_hangup, | |
1720 | .break_ctl = rs_break, | |
1721 | .wait_until_sent = rs_wait_until_sent, | |
1722 | .tiocmget = rs_tiocmget, | |
1723 | .tiocmset = rs_tiocmset, | |
1724 | }; | |
1725 | ||
1726 | /* zs_init inits the driver */ | |
1727 | int __init zs_init(void) | |
1728 | { | |
1729 | int channel, i; | |
1730 | struct dec_serial *info; | |
1731 | ||
1732 | if(!BUS_PRESENT) | |
1733 | return -ENODEV; | |
1734 | ||
1da177e4 LT |
1735 | /* Find out how many Z8530 SCCs we have */ |
1736 | if (zs_chain == 0) | |
1737 | probe_sccs(); | |
1738 | serial_driver = alloc_tty_driver(zs_channels_found); | |
1739 | if (!serial_driver) | |
1740 | return -ENOMEM; | |
1741 | ||
1742 | show_serial_version(); | |
1743 | ||
1744 | /* Initialize the tty_driver structure */ | |
1745 | /* Not all of this is exactly right for us. */ | |
1746 | ||
1747 | serial_driver->owner = THIS_MODULE; | |
1748 | serial_driver->devfs_name = "tts/"; | |
1749 | serial_driver->name = "ttyS"; | |
1750 | serial_driver->major = TTY_MAJOR; | |
1751 | serial_driver->minor_start = 64; | |
1752 | serial_driver->type = TTY_DRIVER_TYPE_SERIAL; | |
1753 | serial_driver->subtype = SERIAL_TYPE_NORMAL; | |
1754 | serial_driver->init_termios = tty_std_termios; | |
1755 | serial_driver->init_termios.c_cflag = | |
1756 | B9600 | CS8 | CREAD | HUPCL | CLOCAL; | |
1757 | serial_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_NO_DEVFS; | |
1758 | tty_set_operations(serial_driver, &serial_ops); | |
1759 | ||
1760 | if (tty_register_driver(serial_driver)) | |
1761 | panic("Couldn't register serial driver"); | |
1762 | ||
1763 | for (info = zs_chain, i = 0; info; info = info->zs_next, i++) { | |
1764 | ||
1765 | /* Needed before interrupts are enabled. */ | |
1766 | info->tty = 0; | |
1767 | info->x_char = 0; | |
1768 | ||
1769 | if (info->hook && info->hook->init_info) { | |
1770 | (*info->hook->init_info)(info); | |
1771 | continue; | |
1772 | } | |
1773 | ||
1774 | info->magic = SERIAL_MAGIC; | |
1775 | info->port = (int) info->zs_channel->control; | |
1776 | info->line = i; | |
1777 | info->custom_divisor = 16; | |
1778 | info->close_delay = 50; | |
1779 | info->closing_wait = 3000; | |
1780 | info->event = 0; | |
1781 | info->count = 0; | |
1782 | info->blocked_open = 0; | |
0905780a | 1783 | tasklet_init(&info->tlet, do_softint, (unsigned long)info); |
1da177e4 LT |
1784 | init_waitqueue_head(&info->open_wait); |
1785 | init_waitqueue_head(&info->close_wait); | |
1786 | printk("ttyS%02d at 0x%08x (irq = %d) is a Z85C30 SCC\n", | |
1787 | info->line, info->port, info->irq); | |
1788 | tty_register_device(serial_driver, info->line, NULL); | |
1789 | ||
1790 | } | |
1791 | ||
1792 | for (channel = 0; channel < zs_channels_found; ++channel) { | |
1793 | zs_soft[channel].clk_divisor = 16; | |
1794 | zs_soft[channel].zs_baud = get_zsbaud(&zs_soft[channel]); | |
1795 | ||
1796 | if (request_irq(zs_soft[channel].irq, rs_interrupt, SA_SHIRQ, | |
1797 | "scc", &zs_soft[channel])) | |
1798 | printk(KERN_ERR "decserial: can't get irq %d\n", | |
1799 | zs_soft[channel].irq); | |
1800 | ||
1801 | if (zs_soft[channel].hook) { | |
1802 | zs_startup(&zs_soft[channel]); | |
1803 | if (zs_soft[channel].hook->init_channel) | |
1804 | (*zs_soft[channel].hook->init_channel) | |
1805 | (&zs_soft[channel]); | |
1806 | } | |
1807 | } | |
1808 | ||
1809 | return 0; | |
1810 | } | |
1811 | ||
1812 | /* | |
1813 | * polling I/O routines | |
1814 | */ | |
0905780a | 1815 | static int zs_poll_tx_char(void *handle, unsigned char ch) |
1da177e4 LT |
1816 | { |
1817 | struct dec_serial *info = handle; | |
1818 | struct dec_zschannel *chan = info->zs_channel; | |
1819 | int ret; | |
1820 | ||
1821 | if(chan) { | |
1822 | int loops = 10000; | |
1823 | ||
1824 | while (loops && !(read_zsreg(chan, 0) & Tx_BUF_EMP)) | |
1825 | loops--; | |
1826 | ||
1827 | if (loops) { | |
1828 | write_zsdata(chan, ch); | |
1829 | ret = 0; | |
1830 | } else | |
1831 | ret = -EAGAIN; | |
1832 | ||
1833 | return ret; | |
1834 | } else | |
1835 | return -ENODEV; | |
1836 | } | |
1837 | ||
0905780a | 1838 | static int zs_poll_rx_char(void *handle) |
1da177e4 LT |
1839 | { |
1840 | struct dec_serial *info = handle; | |
1841 | struct dec_zschannel *chan = info->zs_channel; | |
1842 | int ret; | |
1843 | ||
1844 | if(chan) { | |
1845 | int loops = 10000; | |
1846 | ||
1847 | while (loops && !(read_zsreg(chan, 0) & Rx_CH_AV)) | |
1848 | loops--; | |
1849 | ||
1850 | if (loops) | |
1851 | ret = read_zsdata(chan); | |
1852 | else | |
1853 | ret = -EAGAIN; | |
1854 | ||
1855 | return ret; | |
1856 | } else | |
1857 | return -ENODEV; | |
1858 | } | |
1859 | ||
1860 | int register_zs_hook(unsigned int channel, struct dec_serial_hook *hook) | |
1861 | { | |
1862 | struct dec_serial *info = &zs_soft[channel]; | |
1863 | ||
1864 | if (info->hook) { | |
1865 | printk("%s: line %d has already a hook registered\n", | |
1866 | __FUNCTION__, channel); | |
1867 | ||
1868 | return 0; | |
1869 | } else { | |
1870 | hook->poll_rx_char = zs_poll_rx_char; | |
1871 | hook->poll_tx_char = zs_poll_tx_char; | |
1872 | info->hook = hook; | |
1873 | ||
1874 | return 1; | |
1875 | } | |
1876 | } | |
1877 | ||
1878 | int unregister_zs_hook(unsigned int channel) | |
1879 | { | |
1880 | struct dec_serial *info = &zs_soft[channel]; | |
1881 | ||
1882 | if (info->hook) { | |
1883 | info->hook = NULL; | |
1884 | return 1; | |
1885 | } else { | |
1886 | printk("%s: trying to unregister hook on line %d," | |
1887 | " but none is registered\n", __FUNCTION__, channel); | |
1888 | return 0; | |
1889 | } | |
1890 | } | |
1891 | ||
1892 | /* | |
1893 | * ------------------------------------------------------------ | |
1894 | * Serial console driver | |
1895 | * ------------------------------------------------------------ | |
1896 | */ | |
1897 | #ifdef CONFIG_SERIAL_DEC_CONSOLE | |
1898 | ||
1899 | ||
1900 | /* | |
1901 | * Print a string to the serial port trying not to disturb | |
1902 | * any possible real use of the port... | |
1903 | */ | |
1904 | static void serial_console_write(struct console *co, const char *s, | |
1905 | unsigned count) | |
1906 | { | |
1907 | struct dec_serial *info; | |
1908 | int i; | |
1909 | ||
1910 | info = zs_soft + co->index; | |
1911 | ||
1912 | for (i = 0; i < count; i++, s++) { | |
1913 | if(*s == '\n') | |
1914 | zs_poll_tx_char(info, '\r'); | |
1915 | zs_poll_tx_char(info, *s); | |
1916 | } | |
1917 | } | |
1918 | ||
1919 | static struct tty_driver *serial_console_device(struct console *c, int *index) | |
1920 | { | |
1921 | *index = c->index; | |
1922 | return serial_driver; | |
1923 | } | |
1924 | ||
1925 | /* | |
1926 | * Setup initial baud/bits/parity. We do two things here: | |
1927 | * - construct a cflag setting for the first rs_open() | |
1928 | * - initialize the serial port | |
1929 | * Return non-zero if we didn't find a serial port. | |
1930 | */ | |
1931 | static int __init serial_console_setup(struct console *co, char *options) | |
1932 | { | |
1933 | struct dec_serial *info; | |
1934 | int baud = 9600; | |
1935 | int bits = 8; | |
1936 | int parity = 'n'; | |
1937 | int cflag = CREAD | HUPCL | CLOCAL; | |
1938 | int clk_divisor = 16; | |
1939 | int brg; | |
1940 | char *s; | |
1941 | unsigned long flags; | |
1942 | ||
1943 | if(!BUS_PRESENT) | |
1944 | return -ENODEV; | |
1945 | ||
1946 | info = zs_soft + co->index; | |
1947 | ||
1948 | if (zs_chain == 0) | |
1949 | probe_sccs(); | |
1950 | ||
1951 | info->is_cons = 1; | |
1952 | ||
1953 | if (options) { | |
1954 | baud = simple_strtoul(options, NULL, 10); | |
1955 | s = options; | |
1956 | while(*s >= '0' && *s <= '9') | |
1957 | s++; | |
1958 | if (*s) | |
1959 | parity = *s++; | |
1960 | if (*s) | |
1961 | bits = *s - '0'; | |
1962 | } | |
1963 | ||
1964 | /* | |
1965 | * Now construct a cflag setting. | |
1966 | */ | |
1967 | switch(baud) { | |
1968 | case 1200: | |
1969 | cflag |= B1200; | |
1970 | break; | |
1971 | case 2400: | |
1972 | cflag |= B2400; | |
1973 | break; | |
1974 | case 4800: | |
1975 | cflag |= B4800; | |
1976 | break; | |
1977 | case 19200: | |
1978 | cflag |= B19200; | |
1979 | break; | |
1980 | case 38400: | |
1981 | cflag |= B38400; | |
1982 | break; | |
1983 | case 57600: | |
1984 | cflag |= B57600; | |
1985 | break; | |
1986 | case 115200: | |
1987 | cflag |= B115200; | |
1988 | break; | |
1989 | case 9600: | |
1990 | default: | |
1991 | cflag |= B9600; | |
1992 | /* | |
1993 | * Set this to a sane value to prevent a divide error. | |
1994 | */ | |
1995 | baud = 9600; | |
1996 | break; | |
1997 | } | |
1998 | switch(bits) { | |
1999 | case 7: | |
2000 | cflag |= CS7; | |
2001 | break; | |
2002 | default: | |
2003 | case 8: | |
2004 | cflag |= CS8; | |
2005 | break; | |
2006 | } | |
2007 | switch(parity) { | |
2008 | case 'o': case 'O': | |
2009 | cflag |= PARODD; | |
2010 | break; | |
2011 | case 'e': case 'E': | |
2012 | cflag |= PARENB; | |
2013 | break; | |
2014 | } | |
2015 | co->cflag = cflag; | |
2016 | ||
0905780a | 2017 | spin_lock_irqsave(&zs_lock, flags); |
1da177e4 LT |
2018 | |
2019 | /* | |
2020 | * Set up the baud rate generator. | |
2021 | */ | |
2022 | brg = BPS_TO_BRG(baud, zs_parms->clock / clk_divisor); | |
2023 | info->zs_channel->curregs[R12] = (brg & 255); | |
2024 | info->zs_channel->curregs[R13] = ((brg >> 8) & 255); | |
2025 | ||
2026 | /* | |
2027 | * Set byte size and parity. | |
2028 | */ | |
2029 | if (bits == 7) { | |
2030 | info->zs_channel->curregs[R3] |= Rx7; | |
2031 | info->zs_channel->curregs[R5] |= Tx7; | |
2032 | } else { | |
2033 | info->zs_channel->curregs[R3] |= Rx8; | |
2034 | info->zs_channel->curregs[R5] |= Tx8; | |
2035 | } | |
2036 | if (cflag & PARENB) { | |
2037 | info->zs_channel->curregs[R4] |= PAR_ENA; | |
2038 | } | |
2039 | if (!(cflag & PARODD)) { | |
2040 | info->zs_channel->curregs[R4] |= PAR_EVEN; | |
2041 | } | |
2042 | info->zs_channel->curregs[R4] |= SB1; | |
2043 | ||
2044 | /* | |
2045 | * Turn on RTS and DTR. | |
2046 | */ | |
2047 | zs_rtsdtr(info, RTS | DTR, 1); | |
2048 | ||
2049 | /* | |
2050 | * Finally, enable sequencing. | |
2051 | */ | |
2052 | info->zs_channel->curregs[R3] |= RxENABLE; | |
2053 | info->zs_channel->curregs[R5] |= TxENAB; | |
2054 | ||
2055 | /* | |
2056 | * Clear the interrupt registers. | |
2057 | */ | |
2058 | write_zsreg(info->zs_channel, R0, ERR_RES); | |
2059 | write_zsreg(info->zs_channel, R0, RES_H_IUS); | |
2060 | ||
2061 | /* | |
2062 | * Load up the new values. | |
2063 | */ | |
2064 | load_zsregs(info->zs_channel, info->zs_channel->curregs); | |
2065 | ||
2066 | /* Save the current value of RR0 */ | |
2067 | info->read_reg_zero = read_zsreg(info->zs_channel, R0); | |
2068 | ||
2069 | zs_soft[co->index].clk_divisor = clk_divisor; | |
2070 | zs_soft[co->index].zs_baud = get_zsbaud(&zs_soft[co->index]); | |
2071 | ||
0905780a | 2072 | spin_unlock_irqrestore(&zs_lock, flags); |
1da177e4 LT |
2073 | |
2074 | return 0; | |
2075 | } | |
2076 | ||
2077 | static struct console sercons = { | |
2078 | .name = "ttyS", | |
2079 | .write = serial_console_write, | |
2080 | .device = serial_console_device, | |
2081 | .setup = serial_console_setup, | |
2082 | .flags = CON_PRINTBUFFER, | |
2083 | .index = -1, | |
2084 | }; | |
2085 | ||
2086 | /* | |
2087 | * Register console. | |
2088 | */ | |
2089 | void __init zs_serial_console_init(void) | |
2090 | { | |
2091 | register_console(&sercons); | |
2092 | } | |
2093 | #endif /* ifdef CONFIG_SERIAL_DEC_CONSOLE */ | |
2094 | ||
2095 | #ifdef CONFIG_KGDB | |
2096 | struct dec_zschannel *zs_kgdbchan; | |
2097 | static unsigned char scc_inittab[] = { | |
2098 | 9, 0x80, /* reset A side (CHRA) */ | |
2099 | 13, 0, /* set baud rate divisor */ | |
2100 | 12, 1, | |
2101 | 14, 1, /* baud rate gen enable, src=rtxc (BRENABL) */ | |
2102 | 11, 0x50, /* clocks = br gen (RCBR | TCBR) */ | |
2103 | 5, 0x6a, /* tx 8 bits, assert RTS (Tx8 | TxENAB | RTS) */ | |
2104 | 4, 0x44, /* x16 clock, 1 stop (SB1 | X16CLK)*/ | |
2105 | 3, 0xc1, /* rx enable, 8 bits (RxENABLE | Rx8)*/ | |
2106 | }; | |
2107 | ||
2108 | /* These are for receiving and sending characters under the kgdb | |
2109 | * source level kernel debugger. | |
2110 | */ | |
2111 | void putDebugChar(char kgdb_char) | |
2112 | { | |
2113 | struct dec_zschannel *chan = zs_kgdbchan; | |
2114 | while ((read_zsreg(chan, 0) & Tx_BUF_EMP) == 0) | |
2115 | RECOVERY_DELAY; | |
2116 | write_zsdata(chan, kgdb_char); | |
2117 | } | |
2118 | char getDebugChar(void) | |
2119 | { | |
2120 | struct dec_zschannel *chan = zs_kgdbchan; | |
2121 | while((read_zsreg(chan, 0) & Rx_CH_AV) == 0) | |
2122 | eieio(); /*barrier();*/ | |
2123 | return read_zsdata(chan); | |
2124 | } | |
2125 | void kgdb_interruptible(int yes) | |
2126 | { | |
2127 | struct dec_zschannel *chan = zs_kgdbchan; | |
2128 | int one, nine; | |
2129 | nine = read_zsreg(chan, 9); | |
2130 | if (yes == 1) { | |
2131 | one = EXT_INT_ENAB|RxINT_ALL; | |
2132 | nine |= MIE; | |
2133 | printk("turning serial ints on\n"); | |
2134 | } else { | |
2135 | one = RxINT_DISAB; | |
2136 | nine &= ~MIE; | |
2137 | printk("turning serial ints off\n"); | |
2138 | } | |
2139 | write_zsreg(chan, 1, one); | |
2140 | write_zsreg(chan, 9, nine); | |
2141 | } | |
2142 | ||
2143 | static int kgdbhook_init_channel(void *handle) | |
2144 | { | |
2145 | return 0; | |
2146 | } | |
2147 | ||
2148 | static void kgdbhook_init_info(void *handle) | |
2149 | { | |
2150 | } | |
2151 | ||
2152 | static void kgdbhook_rx_char(void *handle, unsigned char ch, unsigned char fl) | |
2153 | { | |
2154 | struct dec_serial *info = handle; | |
2155 | ||
2156 | if (fl != TTY_NORMAL) | |
2157 | return; | |
2158 | if (ch == 0x03 || ch == '$') | |
2159 | breakpoint(); | |
2160 | } | |
2161 | ||
2162 | /* This sets up the serial port we're using, and turns on | |
2163 | * interrupts for that channel, so kgdb is usable once we're done. | |
2164 | */ | |
2165 | static inline void kgdb_chaninit(struct dec_zschannel *ms, int intson, int bps) | |
2166 | { | |
2167 | int brg; | |
2168 | int i, x; | |
2169 | volatile char *sccc = ms->control; | |
2170 | brg = BPS_TO_BRG(bps, zs_parms->clock/16); | |
2171 | printk("setting bps on kgdb line to %d [brg=%x]\n", bps, brg); | |
2172 | for (i = 20000; i != 0; --i) { | |
2173 | x = *sccc; eieio(); | |
2174 | } | |
2175 | for (i = 0; i < sizeof(scc_inittab); ++i) { | |
2176 | write_zsreg(ms, scc_inittab[i], scc_inittab[i+1]); | |
2177 | i++; | |
2178 | } | |
2179 | } | |
2180 | /* This is called at boot time to prime the kgdb serial debugging | |
2181 | * serial line. The 'tty_num' argument is 0 for /dev/ttya and 1 | |
2182 | * for /dev/ttyb which is determined in setup_arch() from the | |
2183 | * boot command line flags. | |
2184 | */ | |
2185 | struct dec_serial_hook zs_kgdbhook = { | |
2186 | .init_channel = kgdbhook_init_channel, | |
2187 | .init_info = kgdbhook_init_info, | |
2188 | .rx_char = kgdbhook_rx_char, | |
2189 | .cflags = B38400 | CS8 | CLOCAL, | |
2190 | } | |
2191 | ||
2192 | void __init zs_kgdb_hook(int tty_num) | |
2193 | { | |
2194 | /* Find out how many Z8530 SCCs we have */ | |
2195 | if (zs_chain == 0) | |
2196 | probe_sccs(); | |
2197 | zs_soft[tty_num].zs_channel = &zs_channels[tty_num]; | |
2198 | zs_kgdbchan = zs_soft[tty_num].zs_channel; | |
2199 | zs_soft[tty_num].change_needed = 0; | |
2200 | zs_soft[tty_num].clk_divisor = 16; | |
2201 | zs_soft[tty_num].zs_baud = 38400; | |
2202 | zs_soft[tty_num].hook = &zs_kgdbhook; /* This runs kgdb */ | |
2203 | /* Turn on transmitter/receiver at 8-bits/char */ | |
2204 | kgdb_chaninit(zs_soft[tty_num].zs_channel, 1, 38400); | |
2205 | printk("KGDB: on channel %d initialized\n", tty_num); | |
2206 | set_debug_traps(); /* init stub */ | |
2207 | } | |
2208 | #endif /* ifdef CONFIG_KGDB */ |