Commit | Line | Data |
---|---|---|
d9fcf2fb JM |
1 | /* Remote serial interface for local (hardwired) serial ports for GO32. |
2 | Copyright 1992, 1993, 2000 Free Software Foundation, Inc. | |
c906108c SS |
3 | |
4 | Contributed by Nigel Stephens, Algorithmics Ltd. (nigel@algor.co.uk). | |
5 | ||
6 | This version uses DPMI interrupts to handle buffered i/o | |
7 | without the separate "asynctsr" program. | |
8 | ||
9 | This file is part of GDB. | |
10 | ||
11 | This program is free software; you can redistribute it and/or modify | |
12 | it under the terms of the GNU General Public License as published by | |
13 | the Free Software Foundation; either version 2 of the License, or | |
14 | (at your option) any later version. | |
15 | ||
16 | This program is distributed in the hope that it will be useful, | |
17 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
18 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
19 | GNU General Public License for more details. | |
20 | ||
21 | You should have received a copy of the GNU General Public License | |
22 | along with this program; if not, write to the Free Software | |
c5aa993b JM |
23 | Foundation, Inc., 59 Temple Place - Suite 330, |
24 | Boston, MA 02111-1307, USA. */ | |
c906108c SS |
25 | |
26 | #include "defs.h" | |
27 | #include "gdbcmd.h" | |
28 | #include "serial.h" | |
29 | ||
30 | ||
31 | /* | |
32 | * NS16550 UART registers | |
33 | */ | |
34 | ||
35 | #define COM1ADDR 0x3f8 | |
36 | #define COM2ADDR 0x2f8 | |
37 | #define COM3ADDR 0x3e8 | |
38 | #define COM4ADDR 0x3e0 | |
39 | ||
40 | #define com_data 0 /* data register (R/W) */ | |
41 | #define com_dlbl 0 /* divisor latch low (W) */ | |
42 | #define com_ier 1 /* interrupt enable (W) */ | |
43 | #define com_dlbh 1 /* divisor latch high (W) */ | |
44 | #define com_iir 2 /* interrupt identification (R) */ | |
45 | #define com_fifo 2 /* FIFO control (W) */ | |
46 | #define com_lctl 3 /* line control register (R/W) */ | |
47 | #define com_cfcr 3 /* line control register (R/W) */ | |
48 | #define com_mcr 4 /* modem control register (R/W) */ | |
49 | #define com_lsr 5 /* line status register (R/W) */ | |
50 | #define com_msr 6 /* modem status register (R/W) */ | |
51 | ||
52 | /* | |
53 | * Constants for computing 16 bit baud rate divisor (lower byte | |
54 | * in com_dlbl, upper in com_dlbh) from 1.8432MHz crystal. Divisor is | |
55 | * 1.8432 MHz / (16 * X) for X bps. If the baud rate can't be set | |
56 | * to within +- (desired_rate*SPEED_TOLERANCE/1000) bps, we fail. | |
57 | */ | |
58 | #define COMTICK (1843200/16) | |
59 | #define SPEED_TOLERANCE 30 /* thousandths; real == desired +- 3.0% */ | |
60 | ||
61 | /* interrupt enable register */ | |
62 | #define IER_ERXRDY 0x1 /* int on rx ready */ | |
63 | #define IER_ETXRDY 0x2 /* int on tx ready */ | |
64 | #define IER_ERLS 0x4 /* int on line status change */ | |
65 | #define IER_EMSC 0x8 /* int on modem status change */ | |
66 | ||
67 | /* interrupt identification register */ | |
68 | #define IIR_FIFO_MASK 0xc0 /* set if FIFOs are enabled */ | |
69 | #define IIR_IMASK 0xf /* interrupt cause mask */ | |
70 | #define IIR_NOPEND 0x1 /* nothing pending */ | |
71 | #define IIR_RLS 0x6 /* receive line status */ | |
72 | #define IIR_RXRDY 0x4 /* receive ready */ | |
73 | #define IIR_RXTOUT 0xc /* receive timeout */ | |
74 | #define IIR_TXRDY 0x2 /* transmit ready */ | |
75 | #define IIR_MLSC 0x0 /* modem status */ | |
76 | ||
77 | ||
78 | /* fifo control register */ | |
79 | #define FIFO_ENABLE 0x01 /* enable fifo */ | |
80 | #define FIFO_RCV_RST 0x02 /* reset receive fifo */ | |
81 | #define FIFO_XMT_RST 0x04 /* reset transmit fifo */ | |
82 | #define FIFO_DMA_MODE 0x08 /* enable dma mode */ | |
83 | #define FIFO_TRIGGER_1 0x00 /* trigger at 1 char */ | |
84 | #define FIFO_TRIGGER_4 0x40 /* trigger at 4 chars */ | |
85 | #define FIFO_TRIGGER_8 0x80 /* trigger at 8 chars */ | |
86 | #define FIFO_TRIGGER_14 0xc0 /* trigger at 14 chars */ | |
87 | ||
88 | /* character format control register */ | |
89 | #define CFCR_DLAB 0x80 /* divisor latch */ | |
90 | #define CFCR_SBREAK 0x40 /* send break */ | |
91 | #define CFCR_PZERO 0x30 /* zero parity */ | |
92 | #define CFCR_PONE 0x20 /* one parity */ | |
93 | #define CFCR_PEVEN 0x10 /* even parity */ | |
94 | #define CFCR_PODD 0x00 /* odd parity */ | |
95 | #define CFCR_PENAB 0x08 /* parity enable */ | |
96 | #define CFCR_STOPB 0x04 /* 2 stop bits */ | |
97 | #define CFCR_8BITS 0x03 /* 8 data bits */ | |
98 | #define CFCR_7BITS 0x02 /* 7 data bits */ | |
99 | #define CFCR_6BITS 0x01 /* 6 data bits */ | |
100 | #define CFCR_5BITS 0x00 /* 5 data bits */ | |
101 | ||
102 | /* modem control register */ | |
103 | #define MCR_LOOPBACK 0x10 /* loopback */ | |
104 | #define MCR_IENABLE 0x08 /* output 2 = int enable */ | |
105 | #define MCR_DRS 0x04 /* output 1 = xxx */ | |
106 | #define MCR_RTS 0x02 /* enable RTS */ | |
107 | #define MCR_DTR 0x01 /* enable DTR */ | |
108 | ||
109 | /* line status register */ | |
110 | #define LSR_RCV_FIFO 0x80 /* error in receive fifo */ | |
111 | #define LSR_TSRE 0x40 /* transmitter empty */ | |
112 | #define LSR_TXRDY 0x20 /* transmitter ready */ | |
113 | #define LSR_BI 0x10 /* break detected */ | |
114 | #define LSR_FE 0x08 /* framing error */ | |
115 | #define LSR_PE 0x04 /* parity error */ | |
116 | #define LSR_OE 0x02 /* overrun error */ | |
117 | #define LSR_RXRDY 0x01 /* receiver ready */ | |
118 | #define LSR_RCV_MASK 0x1f | |
119 | ||
120 | /* modem status register */ | |
121 | #define MSR_DCD 0x80 | |
122 | #define MSR_RI 0x40 | |
123 | #define MSR_DSR 0x20 | |
124 | #define MSR_CTS 0x10 | |
125 | #define MSR_DDCD 0x08 | |
126 | #define MSR_TERI 0x04 | |
127 | #define MSR_DDSR 0x02 | |
128 | #define MSR_DCTS 0x01 | |
129 | ||
9d271fd8 | 130 | #include <string.h> |
b83266a0 SS |
131 | #include <dos.h> |
132 | #include <go32.h> | |
133 | #include <dpmi.h> | |
134 | typedef unsigned long u_long; | |
c906108c | 135 | |
c906108c SS |
136 | /* 16550 rx fifo trigger point */ |
137 | #define FIFO_TRIGGER FIFO_TRIGGER_4 | |
138 | ||
139 | /* input buffer size */ | |
140 | #define CBSIZE 4096 | |
141 | ||
142 | /* return raw 18Hz clock count */ | |
143 | extern long rawclock (void); | |
144 | ||
145 | #define RAWHZ 18 | |
146 | ||
147 | #ifdef DOS_STATS | |
148 | #define CNT_RX 16 | |
149 | #define CNT_TX 17 | |
150 | #define CNT_STRAY 18 | |
151 | #define CNT_ORUN 19 | |
152 | #define NCNT 20 | |
153 | ||
c5aa993b JM |
154 | static int intrcnt; |
155 | static int cnts[NCNT]; | |
156 | static char *cntnames[NCNT] = | |
157 | { | |
c906108c | 158 | /* h/w interrupt counts. */ |
c5aa993b JM |
159 | "mlsc", "nopend", "txrdy", "?3", |
160 | "rxrdy", "?5", "rls", "?7", | |
161 | "?8", "?9", "?a", "?b", | |
162 | "rxtout", "?d", "?e", "?f", | |
c906108c | 163 | /* s/w counts. */ |
c5aa993b | 164 | "rxcnt", "txcnt", "stray", "swoflo" |
c906108c SS |
165 | }; |
166 | ||
167 | #define COUNT(x) cnts[x]++ | |
168 | #else | |
c5aa993b | 169 | #define COUNT(x) |
c906108c SS |
170 | #endif |
171 | ||
172 | /* Main interrupt controller port addresses. */ | |
173 | #define ICU_BASE 0x20 | |
174 | #define ICU_OCW2 (ICU_BASE + 0) | |
175 | #define ICU_MASK (ICU_BASE + 1) | |
176 | ||
177 | /* Original interrupt controller mask register. */ | |
c5aa993b | 178 | unsigned char icu_oldmask; |
c906108c SS |
179 | |
180 | /* Maximum of 8 interrupts (we don't handle the slave icu yet). */ | |
181 | #define NINTR 8 | |
182 | ||
183 | static struct intrupt | |
c5aa993b JM |
184 | { |
185 | char inuse; | |
186 | struct dos_ttystate *port; | |
187 | _go32_dpmi_seginfo old_rmhandler; | |
188 | _go32_dpmi_seginfo old_pmhandler; | |
189 | _go32_dpmi_seginfo new_rmhandler; | |
190 | _go32_dpmi_seginfo new_pmhandler; | |
191 | _go32_dpmi_registers regs; | |
192 | } | |
193 | intrupts[NINTR]; | |
c906108c SS |
194 | |
195 | ||
196 | static struct dos_ttystate | |
c5aa993b JM |
197 | { |
198 | int base; | |
199 | int irq; | |
200 | int refcnt; | |
201 | struct intrupt *intrupt; | |
202 | int fifo; | |
203 | int baudrate; | |
204 | unsigned char cbuf[CBSIZE]; | |
205 | unsigned int first; | |
206 | unsigned int count; | |
207 | int txbusy; | |
208 | unsigned char old_mcr; | |
209 | int ferr; | |
210 | int perr; | |
211 | int oflo; | |
212 | int msr; | |
213 | } | |
214 | ports[4] = | |
c906108c | 215 | { |
c5aa993b | 216 | { |
feba2e88 | 217 | COM1ADDR, 4, 0, NULL, 0, 0, "", 0, 0, 0, 0, 0, 0, 0, 0 |
c5aa993b JM |
218 | } |
219 | , | |
220 | { | |
feba2e88 | 221 | COM2ADDR, 3, 0, NULL, 0, 0, "", 0, 0, 0, 0, 0, 0, 0, 0 |
c5aa993b JM |
222 | } |
223 | , | |
224 | { | |
feba2e88 | 225 | COM3ADDR, 4, 0, NULL, 0, 0, "", 0, 0, 0, 0, 0, 0, 0, 0 |
c5aa993b JM |
226 | } |
227 | , | |
228 | { | |
feba2e88 | 229 | COM4ADDR, 3, 0, NULL, 0, 0, "", 0, 0, 0, 0, 0, 0, 0, 0 |
c5aa993b | 230 | } |
c906108c SS |
231 | }; |
232 | ||
233 | static int dos_open PARAMS ((serial_t scb, const char *name)); | |
234 | static void dos_raw PARAMS ((serial_t scb)); | |
235 | static int dos_readchar PARAMS ((serial_t scb, int timeout)); | |
236 | static int dos_setbaudrate PARAMS ((serial_t scb, int rate)); | |
237 | static int dos_write PARAMS ((serial_t scb, const char *str, int len)); | |
238 | static void dos_close PARAMS ((serial_t scb)); | |
239 | static serial_ttystate dos_get_tty_state PARAMS ((serial_t scb)); | |
240 | static int dos_set_tty_state PARAMS ((serial_t scb, serial_ttystate state)); | |
241 | static int dos_baudconv PARAMS ((int rate)); | |
242 | ||
243 | #define inb(p,a) inportb((p)->base + (a)) | |
244 | #define outb(p,a,v) outportb((p)->base + (a), (v)) | |
245 | #define disable() asm volatile ("cli"); | |
246 | #define enable() asm volatile ("sti"); | |
247 | ||
248 | ||
249 | static int | |
250 | dos_getc (port) | |
251 | volatile struct dos_ttystate *port; | |
252 | { | |
c5aa993b | 253 | int c; |
c906108c | 254 | |
c5aa993b JM |
255 | if (port->count == 0) |
256 | return -1; | |
c906108c | 257 | |
c5aa993b JM |
258 | c = port->cbuf[port->first]; |
259 | disable (); | |
260 | port->first = (port->first + 1) & (CBSIZE - 1); | |
261 | port->count--; | |
262 | enable (); | |
263 | return c; | |
c906108c | 264 | } |
c906108c | 265 | |
c5aa993b JM |
266 | |
267 | static int | |
c906108c SS |
268 | dos_putc (c, port) |
269 | int c; | |
270 | struct dos_ttystate *port; | |
271 | { | |
c5aa993b JM |
272 | if (port->count >= CBSIZE - 1) |
273 | return -1; | |
274 | port->cbuf[(port->first + port->count) & (CBSIZE - 1)] = c; | |
275 | port->count++; | |
276 | return 0; | |
c906108c | 277 | } |
c906108c SS |
278 | \f |
279 | ||
c5aa993b | 280 | |
c906108c SS |
281 | static void |
282 | dos_comisr (irq) | |
283 | int irq; | |
284 | { | |
285 | struct dos_ttystate *port; | |
286 | unsigned char iir, lsr, c; | |
287 | ||
288 | disable (); /* Paranoia */ | |
289 | outportb (ICU_OCW2, 0x20); /* End-Of-Interrupt */ | |
290 | #ifdef DOS_STATS | |
291 | ++intrcnt; | |
292 | #endif | |
293 | ||
294 | port = intrupts[irq].port; | |
c5aa993b | 295 | if (!port) |
c906108c SS |
296 | { |
297 | COUNT (CNT_STRAY); | |
c5aa993b | 298 | return; /* not open */ |
c906108c SS |
299 | } |
300 | ||
301 | while (1) | |
302 | { | |
303 | iir = inb (port, com_iir) & IIR_IMASK; | |
c5aa993b | 304 | switch (iir) |
c906108c | 305 | { |
c5aa993b | 306 | |
c906108c SS |
307 | case IIR_RLS: |
308 | lsr = inb (port, com_lsr); | |
309 | goto rx; | |
c5aa993b | 310 | |
c906108c SS |
311 | case IIR_RXTOUT: |
312 | case IIR_RXRDY: | |
313 | lsr = 0; | |
c5aa993b JM |
314 | |
315 | rx: | |
316 | do | |
c906108c SS |
317 | { |
318 | c = inb (port, com_data); | |
319 | if (lsr & (LSR_BI | LSR_FE | LSR_PE | LSR_OE)) | |
320 | { | |
321 | if (lsr & (LSR_BI | LSR_FE)) | |
322 | port->ferr++; | |
323 | else if (lsr & LSR_PE) | |
324 | port->perr++; | |
325 | if (lsr & LSR_OE) | |
326 | port->oflo++; | |
327 | } | |
328 | ||
329 | if (dos_putc (c, port) < 0) | |
330 | { | |
331 | COUNT (CNT_ORUN); | |
332 | } | |
333 | else | |
334 | { | |
335 | COUNT (CNT_RX); | |
336 | } | |
337 | } | |
338 | while ((lsr = inb (port, com_lsr)) & LSR_RXRDY); | |
339 | break; | |
c5aa993b | 340 | |
c906108c SS |
341 | case IIR_MLSC: |
342 | /* could be used to flowcontrol Tx */ | |
343 | port->msr = inb (port, com_msr); | |
344 | break; | |
c5aa993b | 345 | |
c906108c SS |
346 | case IIR_TXRDY: |
347 | port->txbusy = 0; | |
348 | break; | |
349 | ||
350 | case IIR_NOPEND: | |
351 | /* no more pending interrupts, all done */ | |
352 | return; | |
353 | ||
354 | default: | |
355 | /* unexpected interrupt, ignore */ | |
356 | break; | |
357 | } | |
358 | COUNT (iir); | |
c5aa993b | 359 | } |
c906108c SS |
360 | } |
361 | ||
362 | #ifdef __STDC__ | |
363 | #define ISRNAME(x) dos_comisr##x | |
364 | #else | |
365 | #define ISRNAME(x) dos_comisr/**/x | |
366 | #endif | |
367 | #define ISR(x) static void ISRNAME(x)() {dos_comisr(x);} | |
368 | ||
c5aa993b JM |
369 | ISR (0) ISR (1) ISR (2) ISR (3) |
370 | ISR (4) ISR (5) ISR (6) ISR (7) | |
c906108c | 371 | |
c5aa993b | 372 | typedef void (*isr_t) (); |
c906108c | 373 | |
c5aa993b JM |
374 | static isr_t isrs[NINTR] = |
375 | { | |
376 | ISRNAME (0), ISRNAME (1), ISRNAME (2), ISRNAME (3), | |
377 | ISRNAME (4), ISRNAME (5), ISRNAME (6), ISRNAME (7) | |
c906108c | 378 | }; |
c906108c SS |
379 | \f |
380 | ||
c5aa993b JM |
381 | |
382 | static struct intrupt * | |
383 | dos_hookirq (irq) | |
c906108c SS |
384 | unsigned int irq; |
385 | { | |
386 | struct intrupt *intr; | |
387 | unsigned int vec; | |
388 | isr_t isr; | |
389 | ||
390 | if (irq >= NINTR) | |
391 | return 0; | |
392 | ||
393 | intr = &intrupts[irq]; | |
394 | if (intr->inuse) | |
395 | return 0; | |
c5aa993b | 396 | |
c906108c SS |
397 | vec = 0x08 + irq; |
398 | isr = isrs[irq]; | |
399 | ||
400 | /* setup real mode handler */ | |
401 | _go32_dpmi_get_real_mode_interrupt_vector (vec, &intr->old_rmhandler); | |
402 | ||
c5aa993b JM |
403 | intr->new_rmhandler.pm_selector = _go32_my_cs (); |
404 | intr->new_rmhandler.pm_offset = (u_long) isr; | |
c906108c SS |
405 | if (_go32_dpmi_allocate_real_mode_callback_iret (&intr->new_rmhandler, |
406 | &intr->regs)) | |
407 | { | |
408 | return 0; | |
409 | } | |
410 | ||
411 | if (_go32_dpmi_set_real_mode_interrupt_vector (vec, &intr->new_rmhandler)) | |
412 | { | |
413 | return 0; | |
414 | } | |
c5aa993b | 415 | |
c906108c | 416 | /* setup protected mode handler */ |
c5aa993b | 417 | _go32_dpmi_get_protected_mode_interrupt_vector (vec, &intr->old_pmhandler); |
c906108c | 418 | |
c5aa993b JM |
419 | intr->new_pmhandler.pm_selector = _go32_my_cs (); |
420 | intr->new_pmhandler.pm_offset = (u_long) isr; | |
c906108c SS |
421 | _go32_dpmi_allocate_iret_wrapper (&intr->new_pmhandler); |
422 | ||
c5aa993b | 423 | if (_go32_dpmi_set_protected_mode_interrupt_vector (vec, &intr->new_pmhandler)) |
c906108c SS |
424 | { |
425 | return 0; | |
426 | } | |
427 | ||
428 | /* setup interrupt controller mask */ | |
429 | disable (); | |
430 | outportb (ICU_MASK, inportb (ICU_MASK) & ~(1 << irq)); | |
431 | enable (); | |
432 | ||
433 | intr->inuse = 1; | |
434 | return intr; | |
435 | } | |
436 | ||
437 | ||
438 | static void | |
439 | dos_unhookirq (intr) | |
440 | struct intrupt *intr; | |
441 | { | |
442 | unsigned int irq, vec; | |
443 | unsigned char mask; | |
444 | ||
445 | irq = intr - intrupts; | |
446 | vec = 0x08 + irq; | |
447 | ||
448 | /* restore old interrupt mask bit */ | |
449 | mask = 1 << irq; | |
450 | disable (); | |
451 | outportb (ICU_MASK, inportb (ICU_MASK) | (mask & icu_oldmask)); | |
452 | enable (); | |
453 | ||
454 | /* remove real mode handler */ | |
455 | _go32_dpmi_set_real_mode_interrupt_vector (vec, &intr->old_rmhandler); | |
456 | _go32_dpmi_free_real_mode_callback (&intr->new_rmhandler); | |
c5aa993b | 457 | |
c906108c SS |
458 | /* remove protected mode handler */ |
459 | _go32_dpmi_set_protected_mode_interrupt_vector (vec, &intr->old_pmhandler); | |
460 | _go32_dpmi_free_iret_wrapper (&intr->new_pmhandler); | |
461 | intr->inuse = 0; | |
462 | } | |
c906108c SS |
463 | \f |
464 | ||
c5aa993b | 465 | |
c906108c SS |
466 | static int |
467 | dos_open (scb, name) | |
468 | serial_t scb; | |
469 | const char *name; | |
470 | { | |
471 | struct dos_ttystate *port; | |
472 | int fd, i; | |
473 | ||
474 | if (strncasecmp (name, "/dev/", 5) == 0) | |
475 | name += 5; | |
476 | else if (strncasecmp (name, "\\dev\\", 5) == 0) | |
477 | name += 5; | |
478 | ||
479 | if (strlen (name) != 4 || strncasecmp (name, "com", 3) != 0) | |
480 | { | |
481 | errno = ENOENT; | |
482 | return -1; | |
483 | } | |
484 | ||
485 | if (name[3] < '1' || name[3] > '4') | |
486 | { | |
487 | errno = ENOENT; | |
488 | return -1; | |
489 | } | |
490 | ||
dfed996b EZ |
491 | /* FIXME: this is a Bad Idea (tm)! One should *never* invent file |
492 | handles, since they might be already used by other files/devices. | |
493 | The Right Way to do this is to create a real handle by dup()'ing | |
494 | some existing one. */ | |
c906108c SS |
495 | fd = name[3] - '1'; |
496 | port = &ports[fd]; | |
497 | if (port->refcnt++ > 0) | |
498 | { | |
499 | /* Device already opened another user. Just point at it. */ | |
500 | scb->fd = fd; | |
501 | return 0; | |
502 | } | |
503 | ||
504 | /* force access to ID reg */ | |
c5aa993b JM |
505 | outb (port, com_cfcr, 0); |
506 | outb (port, com_iir, 0); | |
507 | for (i = 0; i < 17; i++) | |
508 | { | |
509 | if ((inb (port, com_iir) & 0x38) == 0) | |
510 | goto ok; | |
511 | (void) inb (port, com_data); /* clear recv */ | |
512 | } | |
c906108c SS |
513 | errno = ENODEV; |
514 | return -1; | |
515 | ||
516 | ok: | |
517 | /* disable all interrupts in chip */ | |
c5aa993b | 518 | outb (port, com_ier, 0); |
c906108c SS |
519 | |
520 | /* tentatively enable 16550 fifo, and see if it responds */ | |
c5aa993b JM |
521 | outb (port, com_fifo, FIFO_ENABLE | FIFO_RCV_RST | FIFO_XMT_RST | FIFO_TRIGGER); |
522 | sleep (1); | |
523 | port->fifo = ((inb (port, com_iir) & IIR_FIFO_MASK) == IIR_FIFO_MASK); | |
c906108c SS |
524 | |
525 | /* clear pending status reports. */ | |
c5aa993b JM |
526 | (void) inb (port, com_lsr); |
527 | (void) inb (port, com_msr); | |
c906108c SS |
528 | |
529 | /* enable external interrupt gate (to avoid floating IRQ) */ | |
c5aa993b | 530 | outb (port, com_mcr, MCR_IENABLE); |
c906108c SS |
531 | |
532 | /* hook up interrupt handler and initialise icu */ | |
533 | port->intrupt = dos_hookirq (port->irq); | |
534 | if (!port->intrupt) | |
535 | { | |
c5aa993b JM |
536 | outb (port, com_mcr, 0); |
537 | outb (port, com_fifo, 0); | |
c906108c SS |
538 | errno = ENODEV; |
539 | return -1; | |
540 | } | |
541 | ||
542 | disable (); | |
543 | ||
544 | /* record port */ | |
c5aa993b | 545 | port->intrupt->port = port; |
c906108c SS |
546 | scb->fd = fd; |
547 | ||
548 | /* clear rx buffer, tx busy flag and overflow count */ | |
549 | port->first = port->count = 0; | |
550 | port->txbusy = 0; | |
551 | port->oflo = 0; | |
552 | ||
553 | /* set default baud rate and mode: 9600,8,n,1 */ | |
554 | i = dos_baudconv (port->baudrate = 9600); | |
c5aa993b JM |
555 | outb (port, com_cfcr, CFCR_DLAB); |
556 | outb (port, com_dlbl, i & 0xff); | |
557 | outb (port, com_dlbh, i >> 8); | |
558 | outb (port, com_cfcr, CFCR_8BITS); | |
c906108c SS |
559 | |
560 | /* enable all interrupts */ | |
c5aa993b | 561 | outb (port, com_ier, IER_ETXRDY | IER_ERXRDY | IER_ERLS | IER_EMSC); |
c906108c SS |
562 | |
563 | /* enable DTR & RTS */ | |
c5aa993b | 564 | outb (port, com_mcr, MCR_DTR | MCR_RTS | MCR_IENABLE); |
c906108c SS |
565 | |
566 | enable (); | |
567 | ||
568 | return 0; | |
569 | } | |
570 | ||
571 | ||
572 | static void | |
573 | dos_close (scb) | |
574 | serial_t scb; | |
575 | { | |
c5aa993b JM |
576 | struct dos_ttystate *port; |
577 | struct intrupt *intrupt; | |
c906108c | 578 | |
c5aa993b JM |
579 | if (!scb) |
580 | return; | |
581 | ||
582 | port = &ports[scb->fd]; | |
583 | ||
584 | if (port->refcnt-- > 1) | |
585 | return; | |
c906108c | 586 | |
c5aa993b JM |
587 | if (!(intrupt = port->intrupt)) |
588 | return; | |
589 | ||
590 | /* disable interrupts, fifo, flow control */ | |
591 | disable (); | |
592 | port->intrupt = 0; | |
593 | intrupt->port = 0; | |
594 | outb (port, com_fifo, 0); | |
595 | outb (port, com_ier, 0); | |
596 | enable (); | |
597 | ||
598 | /* unhook handler, and disable interrupt gate */ | |
599 | dos_unhookirq (intrupt); | |
600 | outb (port, com_mcr, 0); | |
601 | ||
602 | /* Check for overflow errors */ | |
603 | if (port->oflo) | |
604 | { | |
605 | fprintf_unfiltered (gdb_stderr, | |
606 | "Serial input overruns occurred.\n"); | |
607 | fprintf_unfiltered (gdb_stderr, "This system %s handle %d baud.\n", | |
608 | port->fifo ? "cannot" : "needs a 16550 to", | |
609 | port->baudrate); | |
610 | } | |
611 | } | |
c906108c SS |
612 | \f |
613 | ||
c5aa993b | 614 | |
c906108c | 615 | static int |
263fe37d | 616 | dos_noop (serial_t scb ATTRIBUTE_UNUSED) |
c906108c SS |
617 | { |
618 | return 0; | |
619 | } | |
620 | ||
621 | static void | |
263fe37d | 622 | dos_raw (serial_t scb ATTRIBUTE_UNUSED) |
c906108c SS |
623 | { |
624 | /* Always in raw mode */ | |
625 | } | |
626 | ||
627 | static int | |
628 | dos_readchar (scb, timeout) | |
629 | serial_t scb; | |
630 | int timeout; | |
631 | { | |
632 | struct dos_ttystate *port = &ports[scb->fd]; | |
633 | long then; | |
634 | int c; | |
635 | ||
c5aa993b | 636 | then = rawclock () + (timeout * RAWHZ); |
c906108c SS |
637 | while ((c = dos_getc (port)) < 0) |
638 | { | |
639 | if (timeout >= 0 && (rawclock () - then) >= 0) | |
640 | return SERIAL_TIMEOUT; | |
641 | notice_quit (); | |
642 | } | |
643 | ||
644 | return c; | |
645 | } | |
646 | ||
647 | ||
648 | static serial_ttystate | |
649 | dos_get_tty_state (scb) | |
650 | serial_t scb; | |
651 | { | |
652 | struct dos_ttystate *port = &ports[scb->fd]; | |
653 | struct dos_ttystate *state; | |
654 | ||
dfed996b EZ |
655 | /* Are they asking about a port we opened? */ |
656 | if (port->refcnt <= 0) | |
657 | { | |
658 | /* We've never heard about this port. We should fail this call, | |
659 | unless they are asking about one of the 3 standard handles, | |
660 | in which case we pretend the handle was open by us if it is | |
661 | connected to a terminal device. This is beacuse Unix | |
662 | terminals use the serial interface, so GDB expects the | |
663 | standard handles to go through here. */ | |
664 | if (scb->fd >= 3 || !isatty (scb->fd)) | |
665 | return NULL; | |
666 | } | |
667 | ||
c906108c SS |
668 | state = (struct dos_ttystate *) xmalloc (sizeof *state); |
669 | *state = *port; | |
670 | return (serial_ttystate) state; | |
671 | } | |
672 | ||
673 | static int | |
674 | dos_set_tty_state (scb, ttystate) | |
675 | serial_t scb; | |
676 | serial_ttystate ttystate; | |
677 | { | |
678 | struct dos_ttystate *state; | |
679 | ||
680 | state = (struct dos_ttystate *) ttystate; | |
681 | dos_setbaudrate (scb, state->baudrate); | |
682 | return 0; | |
683 | } | |
684 | ||
685 | static int | |
263fe37d EZ |
686 | dos_noflush_set_tty_state (serial_t scb, serial_ttystate new_ttystate, |
687 | serial_ttystate old_ttystate ATTRIBUTE_UNUSED) | |
c906108c SS |
688 | { |
689 | struct dos_ttystate *state; | |
690 | ||
691 | state = (struct dos_ttystate *) new_ttystate; | |
692 | dos_setbaudrate (scb, state->baudrate); | |
693 | return 0; | |
694 | } | |
695 | ||
696 | static int | |
697 | dos_flush_input (scb) | |
698 | serial_t scb; | |
699 | { | |
700 | struct dos_ttystate *port = &ports[scb->fd]; | |
c5aa993b | 701 | disable (); |
c906108c SS |
702 | port->first = port->count = 0; |
703 | if (port->fifo) | |
c5aa993b JM |
704 | outb (port, com_fifo, FIFO_ENABLE | FIFO_RCV_RST | FIFO_TRIGGER); |
705 | enable (); | |
9d271fd8 | 706 | return 0; |
c906108c SS |
707 | } |
708 | ||
709 | static void | |
263fe37d EZ |
710 | dos_print_tty_state (serial_t scb ATTRIBUTE_UNUSED, |
711 | serial_ttystate ttystate ATTRIBUTE_UNUSED, | |
712 | struct ui_file *stream ATTRIBUTE_UNUSED) | |
c906108c SS |
713 | { |
714 | /* Nothing to print */ | |
715 | return; | |
716 | } | |
717 | ||
718 | static int | |
719 | dos_baudconv (rate) | |
720 | int rate; | |
721 | { | |
722 | long x, err; | |
c5aa993b JM |
723 | |
724 | if (rate <= 0) | |
c906108c SS |
725 | return -1; |
726 | ||
c5aa993b JM |
727 | #define divrnd(n, q) (((n) * 2 / (q) + 1) / 2) /* divide and round off */ |
728 | x = divrnd (COMTICK, rate); | |
c906108c SS |
729 | if (x <= 0) |
730 | return -1; | |
c5aa993b JM |
731 | |
732 | err = divrnd (1000 * COMTICK, x * rate) - 1000; | |
c906108c SS |
733 | if (err < 0) |
734 | err = -err; | |
735 | if (err > SPEED_TOLERANCE) | |
736 | return -1; | |
737 | #undef divrnd | |
738 | return x; | |
739 | } | |
740 | ||
741 | ||
742 | static int | |
743 | dos_setbaudrate (scb, rate) | |
744 | serial_t scb; | |
745 | int rate; | |
746 | { | |
c5aa993b | 747 | struct dos_ttystate *port = &ports[scb->fd]; |
c906108c | 748 | |
c5aa993b JM |
749 | if (port->baudrate != rate) |
750 | { | |
751 | int x; | |
752 | unsigned char cfcr; | |
753 | ||
754 | x = dos_baudconv (rate); | |
755 | if (x <= 0) | |
756 | { | |
757 | fprintf_unfiltered (gdb_stderr, "%d: impossible baudrate\n", rate); | |
758 | errno = EINVAL; | |
759 | return -1; | |
760 | } | |
761 | ||
762 | disable (); | |
763 | cfcr = inb (port, com_cfcr); | |
764 | ||
765 | outb (port, com_cfcr, CFCR_DLAB); | |
766 | outb (port, com_dlbl, x & 0xff); | |
767 | outb (port, com_dlbh, x >> 8); | |
768 | outb (port, com_cfcr, cfcr); | |
769 | port->baudrate = rate; | |
770 | enable (); | |
771 | } | |
772 | ||
773 | return 0; | |
c906108c SS |
774 | } |
775 | ||
776 | static int | |
777 | dos_setstopbits (scb, num) | |
778 | serial_t scb; | |
779 | int num; | |
780 | { | |
c5aa993b JM |
781 | struct dos_ttystate *port = &ports[scb->fd]; |
782 | unsigned char cfcr; | |
c906108c | 783 | |
c5aa993b JM |
784 | disable (); |
785 | cfcr = inb (port, com_cfcr); | |
786 | ||
787 | switch (num) | |
788 | { | |
789 | case SERIAL_1_STOPBITS: | |
790 | outb (port, com_cfcr, cfcr & ~CFCR_STOPB); | |
791 | break; | |
792 | case SERIAL_1_AND_A_HALF_STOPBITS: | |
793 | case SERIAL_2_STOPBITS: | |
794 | outb (port, com_cfcr, cfcr | CFCR_STOPB); | |
795 | break; | |
796 | default: | |
797 | enable (); | |
798 | return 1; | |
799 | } | |
800 | enable (); | |
801 | ||
802 | return 0; | |
c906108c SS |
803 | } |
804 | ||
805 | static int | |
806 | dos_write (scb, str, len) | |
807 | serial_t scb; | |
808 | const char *str; | |
809 | int len; | |
810 | { | |
811 | volatile struct dos_ttystate *port = &ports[scb->fd]; | |
812 | int fifosize = port->fifo ? 16 : 1; | |
813 | long then; | |
814 | int cnt; | |
815 | ||
c5aa993b JM |
816 | while (len > 0) |
817 | { | |
818 | /* send the data, fifosize bytes at a time */ | |
819 | cnt = fifosize > len ? len : fifosize; | |
820 | port->txbusy = 1; | |
821 | outportsb (port->base + com_data, str, cnt); | |
822 | str += cnt; | |
823 | len -= cnt; | |
c906108c | 824 | #ifdef DOS_STATS |
c5aa993b | 825 | cnts[CNT_TX] += cnt; |
c906108c | 826 | #endif |
c5aa993b JM |
827 | /* wait for transmission to complete (max 1 sec) */ |
828 | then = rawclock () + RAWHZ; | |
829 | while (port->txbusy) | |
830 | { | |
831 | if ((rawclock () - then) >= 0) | |
832 | { | |
833 | errno = EIO; | |
834 | return SERIAL_ERROR; | |
835 | } | |
836 | } | |
c906108c SS |
837 | } |
838 | return 0; | |
839 | } | |
840 | ||
841 | ||
842 | static int | |
843 | dos_sendbreak (scb) | |
844 | serial_t scb; | |
845 | { | |
846 | volatile struct dos_ttystate *port = &ports[scb->fd]; | |
847 | unsigned char cfcr; | |
848 | long then; | |
849 | ||
c5aa993b JM |
850 | cfcr = inb (port, com_cfcr); |
851 | outb (port, com_cfcr, cfcr | CFCR_SBREAK); | |
c906108c SS |
852 | |
853 | /* 0.25 sec delay */ | |
854 | then = rawclock () + RAWHZ / 4; | |
855 | while ((rawclock () - then) < 0) | |
856 | continue; | |
857 | ||
c5aa993b | 858 | outb (port, com_cfcr, cfcr); |
c906108c SS |
859 | return 0; |
860 | } | |
861 | ||
862 | ||
863 | static struct serial_ops dos_ops = | |
864 | { | |
865 | "hardwire", | |
866 | 0, | |
867 | dos_open, | |
868 | dos_close, | |
869 | dos_readchar, | |
870 | dos_write, | |
871 | dos_noop, /* flush output */ | |
872 | dos_flush_input, | |
873 | dos_sendbreak, | |
874 | dos_raw, | |
875 | dos_get_tty_state, | |
876 | dos_set_tty_state, | |
877 | dos_print_tty_state, | |
878 | dos_noflush_set_tty_state, | |
879 | dos_setbaudrate, | |
880 | dos_setstopbits, | |
881 | dos_noop, /* wait for output to drain */ | |
feba2e88 | 882 | (void (*)(serial_t, int))NULL /* change into async mode */ |
c906108c SS |
883 | }; |
884 | ||
885 | ||
886 | static void | |
263fe37d | 887 | dos_info (char *arg ATTRIBUTE_UNUSED, int from_tty ATTRIBUTE_UNUSED) |
c906108c SS |
888 | { |
889 | struct dos_ttystate *port; | |
263fe37d | 890 | #ifdef DOS_STATS |
c906108c | 891 | int i; |
263fe37d | 892 | #endif |
c906108c | 893 | |
c5aa993b | 894 | for (port = ports; port < &ports[4]; port++) |
c906108c SS |
895 | { |
896 | if (port->baudrate == 0) | |
897 | continue; | |
263fe37d | 898 | printf_filtered ("Port:\tCOM%ld (%sactive)\n", (long)(port - ports) + 1, |
c906108c SS |
899 | port->intrupt ? "" : "not "); |
900 | printf_filtered ("Addr:\t0x%03x (irq %d)\n", port->base, port->irq); | |
901 | printf_filtered ("16550:\t%s\n", port->fifo ? "yes" : "no"); | |
902 | printf_filtered ("Speed:\t%d baud\n", port->baudrate); | |
c5aa993b | 903 | printf_filtered ("Errs:\tframing %d parity %d overflow %d\n\n", |
c906108c SS |
904 | port->ferr, port->perr, port->oflo); |
905 | } | |
906 | ||
907 | #ifdef DOS_STATS | |
908 | printf_filtered ("\nTotal interrupts: %d\n", intrcnt); | |
909 | for (i = 0; i < NCNT; i++) | |
910 | if (cnts[i]) | |
911 | printf_filtered ("%s:\t%d\n", cntnames[i], cnts[i]); | |
912 | #endif | |
913 | } | |
914 | ||
915 | ||
916 | void | |
917 | _initialize_ser_dos () | |
918 | { | |
c906108c SS |
919 | serial_add_interface (&dos_ops); |
920 | ||
921 | /* Save original interrupt mask register. */ | |
922 | icu_oldmask = inportb (ICU_MASK); | |
923 | ||
924 | /* Mark fixed motherboard irqs as inuse. */ | |
925 | intrupts[0].inuse = /* timer tick */ | |
926 | intrupts[1].inuse = /* keyboard */ | |
c5aa993b JM |
927 | intrupts[2].inuse = 1; /* slave icu */ |
928 | ||
c906108c | 929 | add_show_from_set ( |
c5aa993b JM |
930 | add_set_cmd ("com1base", class_obscure, var_zinteger, |
931 | (char *) &ports[0].base, | |
932 | "Set COM1 base i/o port address.", | |
933 | &setlist), | |
934 | &showlist); | |
c906108c SS |
935 | |
936 | add_show_from_set ( | |
c5aa993b JM |
937 | add_set_cmd ("com1irq", class_obscure, var_zinteger, |
938 | (char *) &ports[0].irq, | |
939 | "Set COM1 interrupt request.", | |
940 | &setlist), | |
941 | &showlist); | |
c906108c SS |
942 | |
943 | add_show_from_set ( | |
c5aa993b JM |
944 | add_set_cmd ("com2base", class_obscure, var_zinteger, |
945 | (char *) &ports[1].base, | |
946 | "Set COM2 base i/o port address.", | |
947 | &setlist), | |
948 | &showlist); | |
c906108c SS |
949 | |
950 | add_show_from_set ( | |
c5aa993b JM |
951 | add_set_cmd ("com2irq", class_obscure, var_zinteger, |
952 | (char *) &ports[1].irq, | |
953 | "Set COM2 interrupt request.", | |
954 | &setlist), | |
955 | &showlist); | |
c906108c SS |
956 | |
957 | add_show_from_set ( | |
c5aa993b JM |
958 | add_set_cmd ("com3base", class_obscure, var_zinteger, |
959 | (char *) &ports[2].base, | |
960 | "Set COM3 base i/o port address.", | |
961 | &setlist), | |
962 | &showlist); | |
c906108c SS |
963 | |
964 | add_show_from_set ( | |
c5aa993b JM |
965 | add_set_cmd ("com3irq", class_obscure, var_zinteger, |
966 | (char *) &ports[2].irq, | |
967 | "Set COM3 interrupt request.", | |
968 | &setlist), | |
969 | &showlist); | |
c906108c SS |
970 | |
971 | add_show_from_set ( | |
c5aa993b JM |
972 | add_set_cmd ("com4base", class_obscure, var_zinteger, |
973 | (char *) &ports[3].base, | |
974 | "Set COM4 base i/o port address.", | |
975 | &setlist), | |
976 | &showlist); | |
c906108c SS |
977 | |
978 | add_show_from_set ( | |
c5aa993b JM |
979 | add_set_cmd ("com4irq", class_obscure, var_zinteger, |
980 | (char *) &ports[3].irq, | |
981 | "Set COM4 interrupt request.", | |
982 | &setlist), | |
983 | &showlist); | |
c906108c SS |
984 | |
985 | add_info ("serial", dos_info, | |
986 | "Print DOS serial port status."); | |
987 | } |