Commit | Line | Data |
---|---|---|
d9fcf2fb | 1 | /* Remote serial interface for local (hardwired) serial ports for GO32. |
6aba47ca | 2 | Copyright (C) 1992, 1993, 2000, 2001, 2007 Free Software Foundation, Inc. |
c906108c SS |
3 | |
4 | Contributed by Nigel Stephens, Algorithmics Ltd. (nigel@algor.co.uk). | |
5 | ||
4d277981 | 6 | This version uses DPMI interrupts to handle buffered i/o |
c906108c SS |
7 | without the separate "asynctsr" program. |
8 | ||
4d277981 | 9 | This file is part of GDB. |
c906108c SS |
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 | |
a9762ec7 | 13 | the Free Software Foundation; either version 3 of the License, or |
c906108c SS |
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 | |
a9762ec7 | 22 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
c906108c SS |
23 | |
24 | #include "defs.h" | |
25 | #include "gdbcmd.h" | |
26 | #include "serial.h" | |
4d277981 | 27 | #include "gdb_string.h" |
c906108c SS |
28 | |
29 | ||
30 | /* | |
31 | * NS16550 UART registers | |
32 | */ | |
33 | ||
34 | #define COM1ADDR 0x3f8 | |
35 | #define COM2ADDR 0x2f8 | |
36 | #define COM3ADDR 0x3e8 | |
37 | #define COM4ADDR 0x3e0 | |
38 | ||
39 | #define com_data 0 /* data register (R/W) */ | |
40 | #define com_dlbl 0 /* divisor latch low (W) */ | |
41 | #define com_ier 1 /* interrupt enable (W) */ | |
42 | #define com_dlbh 1 /* divisor latch high (W) */ | |
43 | #define com_iir 2 /* interrupt identification (R) */ | |
44 | #define com_fifo 2 /* FIFO control (W) */ | |
45 | #define com_lctl 3 /* line control register (R/W) */ | |
46 | #define com_cfcr 3 /* line control register (R/W) */ | |
47 | #define com_mcr 4 /* modem control register (R/W) */ | |
48 | #define com_lsr 5 /* line status register (R/W) */ | |
49 | #define com_msr 6 /* modem status register (R/W) */ | |
50 | ||
51 | /* | |
52 | * Constants for computing 16 bit baud rate divisor (lower byte | |
53 | * in com_dlbl, upper in com_dlbh) from 1.8432MHz crystal. Divisor is | |
54 | * 1.8432 MHz / (16 * X) for X bps. If the baud rate can't be set | |
55 | * to within +- (desired_rate*SPEED_TOLERANCE/1000) bps, we fail. | |
56 | */ | |
57 | #define COMTICK (1843200/16) | |
58 | #define SPEED_TOLERANCE 30 /* thousandths; real == desired +- 3.0% */ | |
59 | ||
60 | /* interrupt enable register */ | |
61 | #define IER_ERXRDY 0x1 /* int on rx ready */ | |
62 | #define IER_ETXRDY 0x2 /* int on tx ready */ | |
63 | #define IER_ERLS 0x4 /* int on line status change */ | |
64 | #define IER_EMSC 0x8 /* int on modem status change */ | |
65 | ||
66 | /* interrupt identification register */ | |
67 | #define IIR_FIFO_MASK 0xc0 /* set if FIFOs are enabled */ | |
68 | #define IIR_IMASK 0xf /* interrupt cause mask */ | |
69 | #define IIR_NOPEND 0x1 /* nothing pending */ | |
70 | #define IIR_RLS 0x6 /* receive line status */ | |
71 | #define IIR_RXRDY 0x4 /* receive ready */ | |
72 | #define IIR_RXTOUT 0xc /* receive timeout */ | |
73 | #define IIR_TXRDY 0x2 /* transmit ready */ | |
74 | #define IIR_MLSC 0x0 /* modem status */ | |
75 | ||
76 | ||
77 | /* fifo control register */ | |
78 | #define FIFO_ENABLE 0x01 /* enable fifo */ | |
79 | #define FIFO_RCV_RST 0x02 /* reset receive fifo */ | |
80 | #define FIFO_XMT_RST 0x04 /* reset transmit fifo */ | |
81 | #define FIFO_DMA_MODE 0x08 /* enable dma mode */ | |
82 | #define FIFO_TRIGGER_1 0x00 /* trigger at 1 char */ | |
83 | #define FIFO_TRIGGER_4 0x40 /* trigger at 4 chars */ | |
84 | #define FIFO_TRIGGER_8 0x80 /* trigger at 8 chars */ | |
85 | #define FIFO_TRIGGER_14 0xc0 /* trigger at 14 chars */ | |
86 | ||
87 | /* character format control register */ | |
88 | #define CFCR_DLAB 0x80 /* divisor latch */ | |
89 | #define CFCR_SBREAK 0x40 /* send break */ | |
90 | #define CFCR_PZERO 0x30 /* zero parity */ | |
91 | #define CFCR_PONE 0x20 /* one parity */ | |
92 | #define CFCR_PEVEN 0x10 /* even parity */ | |
93 | #define CFCR_PODD 0x00 /* odd parity */ | |
94 | #define CFCR_PENAB 0x08 /* parity enable */ | |
95 | #define CFCR_STOPB 0x04 /* 2 stop bits */ | |
96 | #define CFCR_8BITS 0x03 /* 8 data bits */ | |
97 | #define CFCR_7BITS 0x02 /* 7 data bits */ | |
98 | #define CFCR_6BITS 0x01 /* 6 data bits */ | |
99 | #define CFCR_5BITS 0x00 /* 5 data bits */ | |
100 | ||
101 | /* modem control register */ | |
102 | #define MCR_LOOPBACK 0x10 /* loopback */ | |
103 | #define MCR_IENABLE 0x08 /* output 2 = int enable */ | |
104 | #define MCR_DRS 0x04 /* output 1 = xxx */ | |
105 | #define MCR_RTS 0x02 /* enable RTS */ | |
106 | #define MCR_DTR 0x01 /* enable DTR */ | |
107 | ||
108 | /* line status register */ | |
109 | #define LSR_RCV_FIFO 0x80 /* error in receive fifo */ | |
110 | #define LSR_TSRE 0x40 /* transmitter empty */ | |
111 | #define LSR_TXRDY 0x20 /* transmitter ready */ | |
112 | #define LSR_BI 0x10 /* break detected */ | |
113 | #define LSR_FE 0x08 /* framing error */ | |
114 | #define LSR_PE 0x04 /* parity error */ | |
115 | #define LSR_OE 0x02 /* overrun error */ | |
116 | #define LSR_RXRDY 0x01 /* receiver ready */ | |
117 | #define LSR_RCV_MASK 0x1f | |
118 | ||
119 | /* modem status register */ | |
120 | #define MSR_DCD 0x80 | |
121 | #define MSR_RI 0x40 | |
122 | #define MSR_DSR 0x20 | |
123 | #define MSR_CTS 0x10 | |
124 | #define MSR_DDCD 0x08 | |
125 | #define MSR_TERI 0x04 | |
126 | #define MSR_DDSR 0x02 | |
127 | #define MSR_DCTS 0x01 | |
128 | ||
4d277981 | 129 | #include <time.h> |
b83266a0 SS |
130 | #include <dos.h> |
131 | #include <go32.h> | |
132 | #include <dpmi.h> | |
133 | typedef unsigned long u_long; | |
c906108c | 134 | |
c906108c SS |
135 | /* 16550 rx fifo trigger point */ |
136 | #define FIFO_TRIGGER FIFO_TRIGGER_4 | |
137 | ||
138 | /* input buffer size */ | |
139 | #define CBSIZE 4096 | |
140 | ||
c906108c SS |
141 | #define RAWHZ 18 |
142 | ||
143 | #ifdef DOS_STATS | |
144 | #define CNT_RX 16 | |
145 | #define CNT_TX 17 | |
146 | #define CNT_STRAY 18 | |
147 | #define CNT_ORUN 19 | |
148 | #define NCNT 20 | |
149 | ||
c5aa993b JM |
150 | static int intrcnt; |
151 | static int cnts[NCNT]; | |
152 | static char *cntnames[NCNT] = | |
153 | { | |
c906108c | 154 | /* h/w interrupt counts. */ |
c5aa993b JM |
155 | "mlsc", "nopend", "txrdy", "?3", |
156 | "rxrdy", "?5", "rls", "?7", | |
157 | "?8", "?9", "?a", "?b", | |
158 | "rxtout", "?d", "?e", "?f", | |
c906108c | 159 | /* s/w counts. */ |
c5aa993b | 160 | "rxcnt", "txcnt", "stray", "swoflo" |
c906108c SS |
161 | }; |
162 | ||
163 | #define COUNT(x) cnts[x]++ | |
164 | #else | |
c5aa993b | 165 | #define COUNT(x) |
c906108c SS |
166 | #endif |
167 | ||
168 | /* Main interrupt controller port addresses. */ | |
169 | #define ICU_BASE 0x20 | |
170 | #define ICU_OCW2 (ICU_BASE + 0) | |
171 | #define ICU_MASK (ICU_BASE + 1) | |
172 | ||
173 | /* Original interrupt controller mask register. */ | |
c5aa993b | 174 | unsigned char icu_oldmask; |
c906108c SS |
175 | |
176 | /* Maximum of 8 interrupts (we don't handle the slave icu yet). */ | |
177 | #define NINTR 8 | |
178 | ||
179 | static struct intrupt | |
c5aa993b JM |
180 | { |
181 | char inuse; | |
182 | struct dos_ttystate *port; | |
183 | _go32_dpmi_seginfo old_rmhandler; | |
184 | _go32_dpmi_seginfo old_pmhandler; | |
185 | _go32_dpmi_seginfo new_rmhandler; | |
186 | _go32_dpmi_seginfo new_pmhandler; | |
187 | _go32_dpmi_registers regs; | |
188 | } | |
189 | intrupts[NINTR]; | |
c906108c SS |
190 | |
191 | ||
192 | static struct dos_ttystate | |
c5aa993b JM |
193 | { |
194 | int base; | |
195 | int irq; | |
196 | int refcnt; | |
197 | struct intrupt *intrupt; | |
198 | int fifo; | |
199 | int baudrate; | |
200 | unsigned char cbuf[CBSIZE]; | |
201 | unsigned int first; | |
202 | unsigned int count; | |
203 | int txbusy; | |
204 | unsigned char old_mcr; | |
205 | int ferr; | |
206 | int perr; | |
207 | int oflo; | |
208 | int msr; | |
209 | } | |
210 | ports[4] = | |
c906108c | 211 | { |
c5aa993b | 212 | { |
feba2e88 | 213 | COM1ADDR, 4, 0, NULL, 0, 0, "", 0, 0, 0, 0, 0, 0, 0, 0 |
c5aa993b JM |
214 | } |
215 | , | |
216 | { | |
feba2e88 | 217 | COM2ADDR, 3, 0, NULL, 0, 0, "", 0, 0, 0, 0, 0, 0, 0, 0 |
c5aa993b JM |
218 | } |
219 | , | |
220 | { | |
feba2e88 | 221 | COM3ADDR, 4, 0, NULL, 0, 0, "", 0, 0, 0, 0, 0, 0, 0, 0 |
c5aa993b JM |
222 | } |
223 | , | |
224 | { | |
feba2e88 | 225 | COM4ADDR, 3, 0, NULL, 0, 0, "", 0, 0, 0, 0, 0, 0, 0, 0 |
c5aa993b | 226 | } |
c906108c SS |
227 | }; |
228 | ||
819cc324 AC |
229 | static int dos_open (struct serial *scb, const char *name); |
230 | static void dos_raw (struct serial *scb); | |
231 | static int dos_readchar (struct serial *scb, int timeout); | |
232 | static int dos_setbaudrate (struct serial *scb, int rate); | |
233 | static int dos_write (struct serial *scb, const char *str, int len); | |
234 | static void dos_close (struct serial *scb); | |
235 | static serial_ttystate dos_get_tty_state (struct serial *scb); | |
236 | static int dos_set_tty_state (struct serial *scb, serial_ttystate state); | |
b1eeef9a | 237 | static int dos_baudconv (int rate); |
c906108c SS |
238 | |
239 | #define inb(p,a) inportb((p)->base + (a)) | |
240 | #define outb(p,a,v) outportb((p)->base + (a), (v)) | |
241 | #define disable() asm volatile ("cli"); | |
242 | #define enable() asm volatile ("sti"); | |
243 | ||
244 | ||
245 | static int | |
fba45db2 | 246 | dos_getc (volatile struct dos_ttystate *port) |
c906108c | 247 | { |
c5aa993b | 248 | int c; |
c906108c | 249 | |
c5aa993b JM |
250 | if (port->count == 0) |
251 | return -1; | |
c906108c | 252 | |
c5aa993b JM |
253 | c = port->cbuf[port->first]; |
254 | disable (); | |
255 | port->first = (port->first + 1) & (CBSIZE - 1); | |
256 | port->count--; | |
257 | enable (); | |
258 | return c; | |
c906108c | 259 | } |
c906108c | 260 | |
c5aa993b JM |
261 | |
262 | static int | |
fba45db2 | 263 | dos_putc (int c, struct dos_ttystate *port) |
c906108c | 264 | { |
c5aa993b JM |
265 | if (port->count >= CBSIZE - 1) |
266 | return -1; | |
267 | port->cbuf[(port->first + port->count) & (CBSIZE - 1)] = c; | |
268 | port->count++; | |
269 | return 0; | |
c906108c | 270 | } |
c906108c SS |
271 | \f |
272 | ||
c5aa993b | 273 | |
c906108c | 274 | static void |
fba45db2 | 275 | dos_comisr (int irq) |
c906108c SS |
276 | { |
277 | struct dos_ttystate *port; | |
278 | unsigned char iir, lsr, c; | |
279 | ||
280 | disable (); /* Paranoia */ | |
281 | outportb (ICU_OCW2, 0x20); /* End-Of-Interrupt */ | |
282 | #ifdef DOS_STATS | |
283 | ++intrcnt; | |
284 | #endif | |
285 | ||
286 | port = intrupts[irq].port; | |
c5aa993b | 287 | if (!port) |
c906108c SS |
288 | { |
289 | COUNT (CNT_STRAY); | |
c5aa993b | 290 | return; /* not open */ |
c906108c SS |
291 | } |
292 | ||
293 | while (1) | |
294 | { | |
295 | iir = inb (port, com_iir) & IIR_IMASK; | |
c5aa993b | 296 | switch (iir) |
c906108c | 297 | { |
c5aa993b | 298 | |
c906108c SS |
299 | case IIR_RLS: |
300 | lsr = inb (port, com_lsr); | |
301 | goto rx; | |
c5aa993b | 302 | |
c906108c SS |
303 | case IIR_RXTOUT: |
304 | case IIR_RXRDY: | |
305 | lsr = 0; | |
c5aa993b JM |
306 | |
307 | rx: | |
308 | do | |
c906108c SS |
309 | { |
310 | c = inb (port, com_data); | |
311 | if (lsr & (LSR_BI | LSR_FE | LSR_PE | LSR_OE)) | |
312 | { | |
313 | if (lsr & (LSR_BI | LSR_FE)) | |
314 | port->ferr++; | |
315 | else if (lsr & LSR_PE) | |
316 | port->perr++; | |
317 | if (lsr & LSR_OE) | |
318 | port->oflo++; | |
319 | } | |
320 | ||
321 | if (dos_putc (c, port) < 0) | |
322 | { | |
323 | COUNT (CNT_ORUN); | |
324 | } | |
325 | else | |
326 | { | |
327 | COUNT (CNT_RX); | |
328 | } | |
329 | } | |
330 | while ((lsr = inb (port, com_lsr)) & LSR_RXRDY); | |
331 | break; | |
c5aa993b | 332 | |
c906108c SS |
333 | case IIR_MLSC: |
334 | /* could be used to flowcontrol Tx */ | |
335 | port->msr = inb (port, com_msr); | |
336 | break; | |
c5aa993b | 337 | |
c906108c SS |
338 | case IIR_TXRDY: |
339 | port->txbusy = 0; | |
340 | break; | |
341 | ||
342 | case IIR_NOPEND: | |
343 | /* no more pending interrupts, all done */ | |
344 | return; | |
345 | ||
346 | default: | |
347 | /* unexpected interrupt, ignore */ | |
348 | break; | |
349 | } | |
350 | COUNT (iir); | |
c5aa993b | 351 | } |
c906108c SS |
352 | } |
353 | ||
c906108c | 354 | #define ISRNAME(x) dos_comisr##x |
4d277981 | 355 | #define ISR(x) static void ISRNAME(x)(void) {dos_comisr(x);} |
c906108c | 356 | |
570b8f7c AC |
357 | ISR (0) ISR (1) ISR (2) ISR (3) /* OK */ |
358 | ISR (4) ISR (5) ISR (6) ISR (7) /* OK */ | |
c906108c | 359 | |
4d277981 | 360 | typedef void (*isr_t) (void); |
c906108c | 361 | |
4d277981 EZ |
362 | static isr_t isrs[NINTR] = |
363 | { | |
c5aa993b JM |
364 | ISRNAME (0), ISRNAME (1), ISRNAME (2), ISRNAME (3), |
365 | ISRNAME (4), ISRNAME (5), ISRNAME (6), ISRNAME (7) | |
4d277981 | 366 | }; |
c906108c SS |
367 | \f |
368 | ||
c5aa993b | 369 | |
4d277981 EZ |
370 | static struct intrupt * |
371 | dos_hookirq (unsigned int irq) | |
c906108c SS |
372 | { |
373 | struct intrupt *intr; | |
374 | unsigned int vec; | |
375 | isr_t isr; | |
376 | ||
377 | if (irq >= NINTR) | |
378 | return 0; | |
379 | ||
380 | intr = &intrupts[irq]; | |
381 | if (intr->inuse) | |
382 | return 0; | |
c5aa993b | 383 | |
c906108c SS |
384 | vec = 0x08 + irq; |
385 | isr = isrs[irq]; | |
386 | ||
387 | /* setup real mode handler */ | |
388 | _go32_dpmi_get_real_mode_interrupt_vector (vec, &intr->old_rmhandler); | |
389 | ||
c5aa993b JM |
390 | intr->new_rmhandler.pm_selector = _go32_my_cs (); |
391 | intr->new_rmhandler.pm_offset = (u_long) isr; | |
c906108c SS |
392 | if (_go32_dpmi_allocate_real_mode_callback_iret (&intr->new_rmhandler, |
393 | &intr->regs)) | |
394 | { | |
395 | return 0; | |
396 | } | |
397 | ||
398 | if (_go32_dpmi_set_real_mode_interrupt_vector (vec, &intr->new_rmhandler)) | |
399 | { | |
400 | return 0; | |
401 | } | |
c5aa993b | 402 | |
c906108c | 403 | /* setup protected mode handler */ |
c5aa993b | 404 | _go32_dpmi_get_protected_mode_interrupt_vector (vec, &intr->old_pmhandler); |
c906108c | 405 | |
c5aa993b JM |
406 | intr->new_pmhandler.pm_selector = _go32_my_cs (); |
407 | intr->new_pmhandler.pm_offset = (u_long) isr; | |
c906108c SS |
408 | _go32_dpmi_allocate_iret_wrapper (&intr->new_pmhandler); |
409 | ||
4d277981 EZ |
410 | if (_go32_dpmi_set_protected_mode_interrupt_vector (vec, |
411 | &intr->new_pmhandler)) | |
c906108c SS |
412 | { |
413 | return 0; | |
414 | } | |
415 | ||
416 | /* setup interrupt controller mask */ | |
417 | disable (); | |
418 | outportb (ICU_MASK, inportb (ICU_MASK) & ~(1 << irq)); | |
419 | enable (); | |
420 | ||
421 | intr->inuse = 1; | |
422 | return intr; | |
423 | } | |
424 | ||
425 | ||
426 | static void | |
fba45db2 | 427 | dos_unhookirq (struct intrupt *intr) |
c906108c SS |
428 | { |
429 | unsigned int irq, vec; | |
430 | unsigned char mask; | |
431 | ||
432 | irq = intr - intrupts; | |
433 | vec = 0x08 + irq; | |
434 | ||
435 | /* restore old interrupt mask bit */ | |
436 | mask = 1 << irq; | |
437 | disable (); | |
438 | outportb (ICU_MASK, inportb (ICU_MASK) | (mask & icu_oldmask)); | |
439 | enable (); | |
440 | ||
441 | /* remove real mode handler */ | |
442 | _go32_dpmi_set_real_mode_interrupt_vector (vec, &intr->old_rmhandler); | |
443 | _go32_dpmi_free_real_mode_callback (&intr->new_rmhandler); | |
c5aa993b | 444 | |
c906108c SS |
445 | /* remove protected mode handler */ |
446 | _go32_dpmi_set_protected_mode_interrupt_vector (vec, &intr->old_pmhandler); | |
447 | _go32_dpmi_free_iret_wrapper (&intr->new_pmhandler); | |
448 | intr->inuse = 0; | |
449 | } | |
c906108c SS |
450 | \f |
451 | ||
c5aa993b | 452 | |
c906108c | 453 | static int |
819cc324 | 454 | dos_open (struct serial *scb, const char *name) |
c906108c SS |
455 | { |
456 | struct dos_ttystate *port; | |
457 | int fd, i; | |
458 | ||
459 | if (strncasecmp (name, "/dev/", 5) == 0) | |
460 | name += 5; | |
461 | else if (strncasecmp (name, "\\dev\\", 5) == 0) | |
462 | name += 5; | |
463 | ||
464 | if (strlen (name) != 4 || strncasecmp (name, "com", 3) != 0) | |
465 | { | |
466 | errno = ENOENT; | |
467 | return -1; | |
468 | } | |
469 | ||
470 | if (name[3] < '1' || name[3] > '4') | |
471 | { | |
472 | errno = ENOENT; | |
473 | return -1; | |
474 | } | |
475 | ||
dfed996b EZ |
476 | /* FIXME: this is a Bad Idea (tm)! One should *never* invent file |
477 | handles, since they might be already used by other files/devices. | |
478 | The Right Way to do this is to create a real handle by dup()'ing | |
479 | some existing one. */ | |
c906108c SS |
480 | fd = name[3] - '1'; |
481 | port = &ports[fd]; | |
482 | if (port->refcnt++ > 0) | |
483 | { | |
484 | /* Device already opened another user. Just point at it. */ | |
485 | scb->fd = fd; | |
486 | return 0; | |
487 | } | |
488 | ||
489 | /* force access to ID reg */ | |
c5aa993b JM |
490 | outb (port, com_cfcr, 0); |
491 | outb (port, com_iir, 0); | |
492 | for (i = 0; i < 17; i++) | |
493 | { | |
494 | if ((inb (port, com_iir) & 0x38) == 0) | |
495 | goto ok; | |
496 | (void) inb (port, com_data); /* clear recv */ | |
497 | } | |
c906108c SS |
498 | errno = ENODEV; |
499 | return -1; | |
500 | ||
501 | ok: | |
502 | /* disable all interrupts in chip */ | |
c5aa993b | 503 | outb (port, com_ier, 0); |
c906108c SS |
504 | |
505 | /* tentatively enable 16550 fifo, and see if it responds */ | |
4d277981 EZ |
506 | outb (port, com_fifo, |
507 | FIFO_ENABLE | FIFO_RCV_RST | FIFO_XMT_RST | FIFO_TRIGGER); | |
c5aa993b JM |
508 | sleep (1); |
509 | port->fifo = ((inb (port, com_iir) & IIR_FIFO_MASK) == IIR_FIFO_MASK); | |
c906108c SS |
510 | |
511 | /* clear pending status reports. */ | |
c5aa993b JM |
512 | (void) inb (port, com_lsr); |
513 | (void) inb (port, com_msr); | |
c906108c SS |
514 | |
515 | /* enable external interrupt gate (to avoid floating IRQ) */ | |
c5aa993b | 516 | outb (port, com_mcr, MCR_IENABLE); |
c906108c SS |
517 | |
518 | /* hook up interrupt handler and initialise icu */ | |
519 | port->intrupt = dos_hookirq (port->irq); | |
520 | if (!port->intrupt) | |
521 | { | |
c5aa993b JM |
522 | outb (port, com_mcr, 0); |
523 | outb (port, com_fifo, 0); | |
c906108c SS |
524 | errno = ENODEV; |
525 | return -1; | |
526 | } | |
527 | ||
528 | disable (); | |
529 | ||
530 | /* record port */ | |
c5aa993b | 531 | port->intrupt->port = port; |
c906108c SS |
532 | scb->fd = fd; |
533 | ||
534 | /* clear rx buffer, tx busy flag and overflow count */ | |
535 | port->first = port->count = 0; | |
536 | port->txbusy = 0; | |
537 | port->oflo = 0; | |
538 | ||
539 | /* set default baud rate and mode: 9600,8,n,1 */ | |
540 | i = dos_baudconv (port->baudrate = 9600); | |
c5aa993b JM |
541 | outb (port, com_cfcr, CFCR_DLAB); |
542 | outb (port, com_dlbl, i & 0xff); | |
543 | outb (port, com_dlbh, i >> 8); | |
544 | outb (port, com_cfcr, CFCR_8BITS); | |
c906108c SS |
545 | |
546 | /* enable all interrupts */ | |
c5aa993b | 547 | outb (port, com_ier, IER_ETXRDY | IER_ERXRDY | IER_ERLS | IER_EMSC); |
c906108c SS |
548 | |
549 | /* enable DTR & RTS */ | |
c5aa993b | 550 | outb (port, com_mcr, MCR_DTR | MCR_RTS | MCR_IENABLE); |
c906108c SS |
551 | |
552 | enable (); | |
553 | ||
554 | return 0; | |
555 | } | |
556 | ||
557 | ||
558 | static void | |
819cc324 | 559 | dos_close (struct serial *scb) |
c906108c | 560 | { |
c5aa993b JM |
561 | struct dos_ttystate *port; |
562 | struct intrupt *intrupt; | |
c906108c | 563 | |
c5aa993b JM |
564 | if (!scb) |
565 | return; | |
566 | ||
567 | port = &ports[scb->fd]; | |
568 | ||
569 | if (port->refcnt-- > 1) | |
570 | return; | |
c906108c | 571 | |
c5aa993b JM |
572 | if (!(intrupt = port->intrupt)) |
573 | return; | |
574 | ||
575 | /* disable interrupts, fifo, flow control */ | |
576 | disable (); | |
577 | port->intrupt = 0; | |
578 | intrupt->port = 0; | |
579 | outb (port, com_fifo, 0); | |
580 | outb (port, com_ier, 0); | |
581 | enable (); | |
582 | ||
583 | /* unhook handler, and disable interrupt gate */ | |
584 | dos_unhookirq (intrupt); | |
585 | outb (port, com_mcr, 0); | |
586 | ||
587 | /* Check for overflow errors */ | |
588 | if (port->oflo) | |
589 | { | |
590 | fprintf_unfiltered (gdb_stderr, | |
591 | "Serial input overruns occurred.\n"); | |
592 | fprintf_unfiltered (gdb_stderr, "This system %s handle %d baud.\n", | |
593 | port->fifo ? "cannot" : "needs a 16550 to", | |
594 | port->baudrate); | |
595 | } | |
596 | } | |
c906108c SS |
597 | \f |
598 | ||
c5aa993b | 599 | |
c906108c | 600 | static int |
819cc324 | 601 | dos_noop (struct serial *scb) |
c906108c SS |
602 | { |
603 | return 0; | |
604 | } | |
605 | ||
606 | static void | |
819cc324 | 607 | dos_raw (struct serial *scb) |
c906108c SS |
608 | { |
609 | /* Always in raw mode */ | |
610 | } | |
611 | ||
612 | static int | |
819cc324 | 613 | dos_readchar (struct serial *scb, int timeout) |
c906108c SS |
614 | { |
615 | struct dos_ttystate *port = &ports[scb->fd]; | |
616 | long then; | |
617 | int c; | |
618 | ||
c5aa993b | 619 | then = rawclock () + (timeout * RAWHZ); |
c906108c SS |
620 | while ((c = dos_getc (port)) < 0) |
621 | { | |
622 | if (timeout >= 0 && (rawclock () - then) >= 0) | |
623 | return SERIAL_TIMEOUT; | |
c906108c SS |
624 | } |
625 | ||
626 | return c; | |
627 | } | |
628 | ||
629 | ||
630 | static serial_ttystate | |
819cc324 | 631 | dos_get_tty_state (struct serial *scb) |
c906108c SS |
632 | { |
633 | struct dos_ttystate *port = &ports[scb->fd]; | |
634 | struct dos_ttystate *state; | |
635 | ||
dfed996b EZ |
636 | /* Are they asking about a port we opened? */ |
637 | if (port->refcnt <= 0) | |
638 | { | |
639 | /* We've never heard about this port. We should fail this call, | |
640 | unless they are asking about one of the 3 standard handles, | |
641 | in which case we pretend the handle was open by us if it is | |
642 | connected to a terminal device. This is beacuse Unix | |
643 | terminals use the serial interface, so GDB expects the | |
644 | standard handles to go through here. */ | |
645 | if (scb->fd >= 3 || !isatty (scb->fd)) | |
646 | return NULL; | |
647 | } | |
648 | ||
c906108c SS |
649 | state = (struct dos_ttystate *) xmalloc (sizeof *state); |
650 | *state = *port; | |
651 | return (serial_ttystate) state; | |
652 | } | |
653 | ||
654 | static int | |
819cc324 | 655 | dos_set_tty_state (struct serial *scb, serial_ttystate ttystate) |
c906108c SS |
656 | { |
657 | struct dos_ttystate *state; | |
658 | ||
659 | state = (struct dos_ttystate *) ttystate; | |
660 | dos_setbaudrate (scb, state->baudrate); | |
661 | return 0; | |
662 | } | |
663 | ||
664 | static int | |
819cc324 | 665 | dos_noflush_set_tty_state (struct serial *scb, serial_ttystate new_ttystate, |
4d277981 | 666 | serial_ttystate old_ttystate) |
c906108c SS |
667 | { |
668 | struct dos_ttystate *state; | |
669 | ||
670 | state = (struct dos_ttystate *) new_ttystate; | |
671 | dos_setbaudrate (scb, state->baudrate); | |
672 | return 0; | |
673 | } | |
674 | ||
675 | static int | |
819cc324 | 676 | dos_flush_input (struct serial *scb) |
c906108c SS |
677 | { |
678 | struct dos_ttystate *port = &ports[scb->fd]; | |
c5aa993b | 679 | disable (); |
c906108c SS |
680 | port->first = port->count = 0; |
681 | if (port->fifo) | |
c5aa993b JM |
682 | outb (port, com_fifo, FIFO_ENABLE | FIFO_RCV_RST | FIFO_TRIGGER); |
683 | enable (); | |
9d271fd8 | 684 | return 0; |
c906108c SS |
685 | } |
686 | ||
687 | static void | |
819cc324 | 688 | dos_print_tty_state (struct serial *scb, serial_ttystate ttystate, |
4d277981 | 689 | struct ui_file *stream) |
c906108c SS |
690 | { |
691 | /* Nothing to print */ | |
692 | return; | |
693 | } | |
694 | ||
695 | static int | |
fba45db2 | 696 | dos_baudconv (int rate) |
c906108c SS |
697 | { |
698 | long x, err; | |
c5aa993b JM |
699 | |
700 | if (rate <= 0) | |
c906108c SS |
701 | return -1; |
702 | ||
4d277981 | 703 | #define divrnd(n, q) (((n) * 2 / (q) + 1) / 2) /* divide and round off */ |
c5aa993b | 704 | x = divrnd (COMTICK, rate); |
c906108c SS |
705 | if (x <= 0) |
706 | return -1; | |
c5aa993b JM |
707 | |
708 | err = divrnd (1000 * COMTICK, x * rate) - 1000; | |
c906108c SS |
709 | if (err < 0) |
710 | err = -err; | |
711 | if (err > SPEED_TOLERANCE) | |
712 | return -1; | |
713 | #undef divrnd | |
714 | return x; | |
715 | } | |
716 | ||
717 | ||
718 | static int | |
819cc324 | 719 | dos_setbaudrate (struct serial *scb, int rate) |
c906108c | 720 | { |
c5aa993b | 721 | struct dos_ttystate *port = &ports[scb->fd]; |
c906108c | 722 | |
c5aa993b JM |
723 | if (port->baudrate != rate) |
724 | { | |
725 | int x; | |
726 | unsigned char cfcr; | |
727 | ||
728 | x = dos_baudconv (rate); | |
729 | if (x <= 0) | |
730 | { | |
731 | fprintf_unfiltered (gdb_stderr, "%d: impossible baudrate\n", rate); | |
732 | errno = EINVAL; | |
733 | return -1; | |
734 | } | |
735 | ||
736 | disable (); | |
737 | cfcr = inb (port, com_cfcr); | |
738 | ||
739 | outb (port, com_cfcr, CFCR_DLAB); | |
740 | outb (port, com_dlbl, x & 0xff); | |
741 | outb (port, com_dlbh, x >> 8); | |
742 | outb (port, com_cfcr, cfcr); | |
743 | port->baudrate = rate; | |
744 | enable (); | |
745 | } | |
746 | ||
747 | return 0; | |
c906108c SS |
748 | } |
749 | ||
750 | static int | |
819cc324 | 751 | dos_setstopbits (struct serial *scb, int num) |
c906108c | 752 | { |
c5aa993b JM |
753 | struct dos_ttystate *port = &ports[scb->fd]; |
754 | unsigned char cfcr; | |
c906108c | 755 | |
c5aa993b JM |
756 | disable (); |
757 | cfcr = inb (port, com_cfcr); | |
758 | ||
759 | switch (num) | |
760 | { | |
761 | case SERIAL_1_STOPBITS: | |
762 | outb (port, com_cfcr, cfcr & ~CFCR_STOPB); | |
763 | break; | |
764 | case SERIAL_1_AND_A_HALF_STOPBITS: | |
765 | case SERIAL_2_STOPBITS: | |
766 | outb (port, com_cfcr, cfcr | CFCR_STOPB); | |
767 | break; | |
768 | default: | |
769 | enable (); | |
770 | return 1; | |
771 | } | |
772 | enable (); | |
773 | ||
774 | return 0; | |
c906108c SS |
775 | } |
776 | ||
777 | static int | |
819cc324 | 778 | dos_write (struct serial *scb, const char *str, int len) |
c906108c SS |
779 | { |
780 | volatile struct dos_ttystate *port = &ports[scb->fd]; | |
781 | int fifosize = port->fifo ? 16 : 1; | |
782 | long then; | |
783 | int cnt; | |
784 | ||
c5aa993b JM |
785 | while (len > 0) |
786 | { | |
787 | /* send the data, fifosize bytes at a time */ | |
788 | cnt = fifosize > len ? len : fifosize; | |
789 | port->txbusy = 1; | |
cd42d3a8 EZ |
790 | /* Francisco Pastor <fpastor.etra-id@etra.es> says OUTSB messes |
791 | up the communications with UARTs with FIFOs. */ | |
792 | #ifdef UART_FIFO_WORKS | |
c5aa993b JM |
793 | outportsb (port->base + com_data, str, cnt); |
794 | str += cnt; | |
795 | len -= cnt; | |
cd42d3a8 EZ |
796 | #else |
797 | for ( ; cnt > 0; cnt--, len--) | |
798 | outportb (port->base + com_data, *str++); | |
799 | #endif | |
c906108c | 800 | #ifdef DOS_STATS |
c5aa993b | 801 | cnts[CNT_TX] += cnt; |
c906108c | 802 | #endif |
c5aa993b JM |
803 | /* wait for transmission to complete (max 1 sec) */ |
804 | then = rawclock () + RAWHZ; | |
805 | while (port->txbusy) | |
806 | { | |
807 | if ((rawclock () - then) >= 0) | |
808 | { | |
809 | errno = EIO; | |
810 | return SERIAL_ERROR; | |
811 | } | |
812 | } | |
c906108c SS |
813 | } |
814 | return 0; | |
815 | } | |
816 | ||
817 | ||
818 | static int | |
819cc324 | 819 | dos_sendbreak (struct serial *scb) |
c906108c SS |
820 | { |
821 | volatile struct dos_ttystate *port = &ports[scb->fd]; | |
822 | unsigned char cfcr; | |
823 | long then; | |
824 | ||
c5aa993b JM |
825 | cfcr = inb (port, com_cfcr); |
826 | outb (port, com_cfcr, cfcr | CFCR_SBREAK); | |
c906108c SS |
827 | |
828 | /* 0.25 sec delay */ | |
829 | then = rawclock () + RAWHZ / 4; | |
830 | while ((rawclock () - then) < 0) | |
831 | continue; | |
832 | ||
c5aa993b | 833 | outb (port, com_cfcr, cfcr); |
c906108c SS |
834 | return 0; |
835 | } | |
836 | ||
837 | ||
838 | static struct serial_ops dos_ops = | |
839 | { | |
840 | "hardwire", | |
841 | 0, | |
842 | dos_open, | |
843 | dos_close, | |
844 | dos_readchar, | |
845 | dos_write, | |
846 | dos_noop, /* flush output */ | |
847 | dos_flush_input, | |
848 | dos_sendbreak, | |
849 | dos_raw, | |
850 | dos_get_tty_state, | |
851 | dos_set_tty_state, | |
852 | dos_print_tty_state, | |
853 | dos_noflush_set_tty_state, | |
854 | dos_setbaudrate, | |
855 | dos_setstopbits, | |
856 | dos_noop, /* wait for output to drain */ | |
819cc324 | 857 | (void (*)(struct serial *, int))NULL /* change into async mode */ |
c906108c SS |
858 | }; |
859 | ||
860 | ||
861 | static void | |
4d277981 | 862 | dos_info (char *arg, int from_tty) |
c906108c SS |
863 | { |
864 | struct dos_ttystate *port; | |
263fe37d | 865 | #ifdef DOS_STATS |
c906108c | 866 | int i; |
263fe37d | 867 | #endif |
c906108c | 868 | |
c5aa993b | 869 | for (port = ports; port < &ports[4]; port++) |
c906108c SS |
870 | { |
871 | if (port->baudrate == 0) | |
872 | continue; | |
263fe37d | 873 | printf_filtered ("Port:\tCOM%ld (%sactive)\n", (long)(port - ports) + 1, |
c906108c SS |
874 | port->intrupt ? "" : "not "); |
875 | printf_filtered ("Addr:\t0x%03x (irq %d)\n", port->base, port->irq); | |
876 | printf_filtered ("16550:\t%s\n", port->fifo ? "yes" : "no"); | |
877 | printf_filtered ("Speed:\t%d baud\n", port->baudrate); | |
c5aa993b | 878 | printf_filtered ("Errs:\tframing %d parity %d overflow %d\n\n", |
c906108c SS |
879 | port->ferr, port->perr, port->oflo); |
880 | } | |
881 | ||
882 | #ifdef DOS_STATS | |
883 | printf_filtered ("\nTotal interrupts: %d\n", intrcnt); | |
884 | for (i = 0; i < NCNT; i++) | |
885 | if (cnts[i]) | |
886 | printf_filtered ("%s:\t%d\n", cntnames[i], cnts[i]); | |
887 | #endif | |
888 | } | |
889 | ||
890 | ||
891 | void | |
fba45db2 | 892 | _initialize_ser_dos (void) |
c906108c | 893 | { |
c906108c SS |
894 | serial_add_interface (&dos_ops); |
895 | ||
896 | /* Save original interrupt mask register. */ | |
897 | icu_oldmask = inportb (ICU_MASK); | |
898 | ||
899 | /* Mark fixed motherboard irqs as inuse. */ | |
900 | intrupts[0].inuse = /* timer tick */ | |
901 | intrupts[1].inuse = /* keyboard */ | |
c5aa993b JM |
902 | intrupts[2].inuse = 1; /* slave icu */ |
903 | ||
85c07804 AC |
904 | add_setshow_zinteger_cmd ("com1base", class_obscure, &ports[0].base, _("\ |
905 | Set COM1 base i/o port address."), _("\ | |
906 | Show COM1 base i/o port address."), NULL, | |
907 | NULL, | |
908 | NULL, /* FIXME: i18n: */ | |
909 | &setlist, &showlist); | |
910 | ||
911 | add_setshow_zinteger_cmd ("com1irq", class_obscure, &ports[0].irq, _("\ | |
912 | Set COM1 interrupt request."), _("\ | |
913 | Show COM1 interrupt request."), NULL, | |
914 | NULL, | |
915 | NULL, /* FIXME: i18n: */ | |
916 | &setlist, &showlist); | |
917 | ||
918 | add_setshow_zinteger_cmd ("com2base", class_obscure, &ports[1].base, _("\ | |
919 | Set COM2 base i/o port address."), _("\ | |
920 | Show COM2 base i/o port address."), NULL, | |
921 | NULL, | |
922 | NULL, /* FIXME: i18n: */ | |
923 | &setlist, &showlist); | |
924 | ||
925 | add_setshow_zinteger_cmd ("com2irq", class_obscure, &ports[1].irq, _("\ | |
926 | Set COM2 interrupt request."), _("\ | |
927 | Show COM2 interrupt request."), NULL, | |
928 | NULL, | |
929 | NULL, /* FIXME: i18n: */ | |
930 | &setlist, &showlist); | |
931 | ||
932 | add_setshow_zinteger_cmd ("com3base", class_obscure, &ports[2].base, _("\ | |
933 | Set COM3 base i/o port address."), _("\ | |
934 | Show COM3 base i/o port address."), NULL, | |
935 | NULL, | |
936 | NULL, /* FIXME: i18n: */ | |
937 | &setlist, &showlist); | |
938 | ||
939 | add_setshow_zinteger_cmd ("com3irq", class_obscure, &ports[2].irq, _("\ | |
940 | Set COM3 interrupt request."), _("\ | |
941 | Show COM3 interrupt request."), NULL, | |
942 | NULL, | |
943 | NULL, /* FIXME: i18n: */ | |
944 | &setlist, &showlist); | |
945 | ||
946 | add_setshow_zinteger_cmd ("com4base", class_obscure, &ports[3].base, _("\ | |
947 | Set COM4 base i/o port address."), _("\ | |
948 | Show COM4 base i/o port address."), NULL, | |
949 | NULL, | |
950 | NULL, /* FIXME: i18n: */ | |
951 | &setlist, &showlist); | |
952 | ||
953 | add_setshow_zinteger_cmd ("com4irq", class_obscure, &ports[3].irq, _("\ | |
954 | Set COM4 interrupt request."), _("\ | |
955 | Show COM4 interrupt request."), NULL, | |
956 | NULL, | |
957 | NULL, /* FIXME: i18n: */ | |
958 | &setlist, &showlist); | |
c906108c SS |
959 | |
960 | add_info ("serial", dos_info, | |
1bedd215 | 961 | _("Print DOS serial port status.")); |
c906108c | 962 | } |