Commit | Line | Data |
---|---|---|
d9fcf2fb | 1 | /* Remote serial interface for local (hardwired) serial ports for GO32. |
7b6bb8da | 2 | Copyright (C) 1992, 1993, 2000, 2001, 2007, 2008, 2009, 2010, 2011 |
9b254dd1 | 3 | Free Software Foundation, Inc. |
c906108c SS |
4 | |
5 | Contributed by Nigel Stephens, Algorithmics Ltd. (nigel@algor.co.uk). | |
6 | ||
4d277981 | 7 | This version uses DPMI interrupts to handle buffered i/o |
c906108c SS |
8 | without the separate "asynctsr" program. |
9 | ||
4d277981 | 10 | This file is part of GDB. |
c906108c SS |
11 | |
12 | This program is free software; you can redistribute it and/or modify | |
13 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 14 | the Free Software Foundation; either version 3 of the License, or |
c906108c SS |
15 | (at your option) any later version. |
16 | ||
17 | This program is distributed in the hope that it will be useful, | |
18 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
19 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
20 | GNU General Public License for more details. | |
21 | ||
22 | You should have received a copy of the GNU General Public License | |
a9762ec7 | 23 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
c906108c SS |
24 | |
25 | #include "defs.h" | |
26 | #include "gdbcmd.h" | |
27 | #include "serial.h" | |
4d277981 | 28 | #include "gdb_string.h" |
c906108c SS |
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 | ||
4d277981 | 130 | #include <time.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 | ||
c906108c SS |
142 | #define RAWHZ 18 |
143 | ||
144 | #ifdef DOS_STATS | |
145 | #define CNT_RX 16 | |
146 | #define CNT_TX 17 | |
147 | #define CNT_STRAY 18 | |
148 | #define CNT_ORUN 19 | |
149 | #define NCNT 20 | |
150 | ||
c5aa993b JM |
151 | static int intrcnt; |
152 | static int cnts[NCNT]; | |
153 | static char *cntnames[NCNT] = | |
154 | { | |
c906108c | 155 | /* h/w interrupt counts. */ |
c5aa993b JM |
156 | "mlsc", "nopend", "txrdy", "?3", |
157 | "rxrdy", "?5", "rls", "?7", | |
158 | "?8", "?9", "?a", "?b", | |
159 | "rxtout", "?d", "?e", "?f", | |
c906108c | 160 | /* s/w counts. */ |
c5aa993b | 161 | "rxcnt", "txcnt", "stray", "swoflo" |
c906108c SS |
162 | }; |
163 | ||
164 | #define COUNT(x) cnts[x]++ | |
165 | #else | |
c5aa993b | 166 | #define COUNT(x) |
c906108c SS |
167 | #endif |
168 | ||
169 | /* Main interrupt controller port addresses. */ | |
170 | #define ICU_BASE 0x20 | |
171 | #define ICU_OCW2 (ICU_BASE + 0) | |
172 | #define ICU_MASK (ICU_BASE + 1) | |
173 | ||
174 | /* Original interrupt controller mask register. */ | |
c5aa993b | 175 | unsigned char icu_oldmask; |
c906108c SS |
176 | |
177 | /* Maximum of 8 interrupts (we don't handle the slave icu yet). */ | |
178 | #define NINTR 8 | |
179 | ||
180 | static struct intrupt | |
c5aa993b JM |
181 | { |
182 | char inuse; | |
183 | struct dos_ttystate *port; | |
184 | _go32_dpmi_seginfo old_rmhandler; | |
185 | _go32_dpmi_seginfo old_pmhandler; | |
186 | _go32_dpmi_seginfo new_rmhandler; | |
187 | _go32_dpmi_seginfo new_pmhandler; | |
188 | _go32_dpmi_registers regs; | |
189 | } | |
190 | intrupts[NINTR]; | |
c906108c SS |
191 | |
192 | ||
193 | static struct dos_ttystate | |
c5aa993b JM |
194 | { |
195 | int base; | |
196 | int irq; | |
197 | int refcnt; | |
198 | struct intrupt *intrupt; | |
199 | int fifo; | |
200 | int baudrate; | |
201 | unsigned char cbuf[CBSIZE]; | |
202 | unsigned int first; | |
203 | unsigned int count; | |
204 | int txbusy; | |
205 | unsigned char old_mcr; | |
206 | int ferr; | |
207 | int perr; | |
208 | int oflo; | |
209 | int msr; | |
210 | } | |
211 | ports[4] = | |
c906108c | 212 | { |
c5aa993b | 213 | { |
feba2e88 | 214 | COM1ADDR, 4, 0, NULL, 0, 0, "", 0, 0, 0, 0, 0, 0, 0, 0 |
c5aa993b JM |
215 | } |
216 | , | |
217 | { | |
feba2e88 | 218 | COM2ADDR, 3, 0, NULL, 0, 0, "", 0, 0, 0, 0, 0, 0, 0, 0 |
c5aa993b JM |
219 | } |
220 | , | |
221 | { | |
feba2e88 | 222 | COM3ADDR, 4, 0, NULL, 0, 0, "", 0, 0, 0, 0, 0, 0, 0, 0 |
c5aa993b JM |
223 | } |
224 | , | |
225 | { | |
feba2e88 | 226 | COM4ADDR, 3, 0, NULL, 0, 0, "", 0, 0, 0, 0, 0, 0, 0, 0 |
c5aa993b | 227 | } |
c906108c SS |
228 | }; |
229 | ||
819cc324 AC |
230 | static int dos_open (struct serial *scb, const char *name); |
231 | static void dos_raw (struct serial *scb); | |
232 | static int dos_readchar (struct serial *scb, int timeout); | |
233 | static int dos_setbaudrate (struct serial *scb, int rate); | |
234 | static int dos_write (struct serial *scb, const char *str, int len); | |
235 | static void dos_close (struct serial *scb); | |
236 | static serial_ttystate dos_get_tty_state (struct serial *scb); | |
237 | static int dos_set_tty_state (struct serial *scb, serial_ttystate state); | |
b1eeef9a | 238 | static int dos_baudconv (int rate); |
c906108c SS |
239 | |
240 | #define inb(p,a) inportb((p)->base + (a)) | |
241 | #define outb(p,a,v) outportb((p)->base + (a), (v)) | |
242 | #define disable() asm volatile ("cli"); | |
243 | #define enable() asm volatile ("sti"); | |
244 | ||
245 | ||
246 | static int | |
fba45db2 | 247 | dos_getc (volatile struct dos_ttystate *port) |
c906108c | 248 | { |
c5aa993b | 249 | int c; |
c906108c | 250 | |
c5aa993b JM |
251 | if (port->count == 0) |
252 | return -1; | |
c906108c | 253 | |
c5aa993b JM |
254 | c = port->cbuf[port->first]; |
255 | disable (); | |
256 | port->first = (port->first + 1) & (CBSIZE - 1); | |
257 | port->count--; | |
258 | enable (); | |
259 | return c; | |
c906108c | 260 | } |
c906108c | 261 | |
c5aa993b JM |
262 | |
263 | static int | |
fba45db2 | 264 | dos_putc (int c, struct dos_ttystate *port) |
c906108c | 265 | { |
c5aa993b JM |
266 | if (port->count >= CBSIZE - 1) |
267 | return -1; | |
268 | port->cbuf[(port->first + port->count) & (CBSIZE - 1)] = c; | |
269 | port->count++; | |
270 | return 0; | |
c906108c | 271 | } |
c906108c SS |
272 | \f |
273 | ||
c5aa993b | 274 | |
c906108c | 275 | static void |
fba45db2 | 276 | dos_comisr (int irq) |
c906108c SS |
277 | { |
278 | struct dos_ttystate *port; | |
279 | unsigned char iir, lsr, c; | |
280 | ||
281 | disable (); /* Paranoia */ | |
282 | outportb (ICU_OCW2, 0x20); /* End-Of-Interrupt */ | |
283 | #ifdef DOS_STATS | |
284 | ++intrcnt; | |
285 | #endif | |
286 | ||
287 | port = intrupts[irq].port; | |
c5aa993b | 288 | if (!port) |
c906108c SS |
289 | { |
290 | COUNT (CNT_STRAY); | |
c5aa993b | 291 | return; /* not open */ |
c906108c SS |
292 | } |
293 | ||
294 | while (1) | |
295 | { | |
296 | iir = inb (port, com_iir) & IIR_IMASK; | |
c5aa993b | 297 | switch (iir) |
c906108c | 298 | { |
c5aa993b | 299 | |
c906108c SS |
300 | case IIR_RLS: |
301 | lsr = inb (port, com_lsr); | |
302 | goto rx; | |
c5aa993b | 303 | |
c906108c SS |
304 | case IIR_RXTOUT: |
305 | case IIR_RXRDY: | |
306 | lsr = 0; | |
c5aa993b JM |
307 | |
308 | rx: | |
309 | do | |
c906108c SS |
310 | { |
311 | c = inb (port, com_data); | |
312 | if (lsr & (LSR_BI | LSR_FE | LSR_PE | LSR_OE)) | |
313 | { | |
314 | if (lsr & (LSR_BI | LSR_FE)) | |
315 | port->ferr++; | |
316 | else if (lsr & LSR_PE) | |
317 | port->perr++; | |
318 | if (lsr & LSR_OE) | |
319 | port->oflo++; | |
320 | } | |
321 | ||
322 | if (dos_putc (c, port) < 0) | |
323 | { | |
324 | COUNT (CNT_ORUN); | |
325 | } | |
326 | else | |
327 | { | |
328 | COUNT (CNT_RX); | |
329 | } | |
330 | } | |
331 | while ((lsr = inb (port, com_lsr)) & LSR_RXRDY); | |
332 | break; | |
c5aa993b | 333 | |
c906108c SS |
334 | case IIR_MLSC: |
335 | /* could be used to flowcontrol Tx */ | |
336 | port->msr = inb (port, com_msr); | |
337 | break; | |
c5aa993b | 338 | |
c906108c SS |
339 | case IIR_TXRDY: |
340 | port->txbusy = 0; | |
341 | break; | |
342 | ||
343 | case IIR_NOPEND: | |
344 | /* no more pending interrupts, all done */ | |
345 | return; | |
346 | ||
347 | default: | |
348 | /* unexpected interrupt, ignore */ | |
349 | break; | |
350 | } | |
351 | COUNT (iir); | |
c5aa993b | 352 | } |
c906108c SS |
353 | } |
354 | ||
c906108c | 355 | #define ISRNAME(x) dos_comisr##x |
4d277981 | 356 | #define ISR(x) static void ISRNAME(x)(void) {dos_comisr(x);} |
c906108c | 357 | |
570b8f7c AC |
358 | ISR (0) ISR (1) ISR (2) ISR (3) /* OK */ |
359 | ISR (4) ISR (5) ISR (6) ISR (7) /* OK */ | |
c906108c | 360 | |
4d277981 | 361 | typedef void (*isr_t) (void); |
c906108c | 362 | |
4d277981 EZ |
363 | static isr_t isrs[NINTR] = |
364 | { | |
c5aa993b JM |
365 | ISRNAME (0), ISRNAME (1), ISRNAME (2), ISRNAME (3), |
366 | ISRNAME (4), ISRNAME (5), ISRNAME (6), ISRNAME (7) | |
4d277981 | 367 | }; |
c906108c SS |
368 | \f |
369 | ||
c5aa993b | 370 | |
4d277981 EZ |
371 | static struct intrupt * |
372 | dos_hookirq (unsigned int irq) | |
c906108c SS |
373 | { |
374 | struct intrupt *intr; | |
375 | unsigned int vec; | |
376 | isr_t isr; | |
377 | ||
378 | if (irq >= NINTR) | |
379 | return 0; | |
380 | ||
381 | intr = &intrupts[irq]; | |
382 | if (intr->inuse) | |
383 | return 0; | |
c5aa993b | 384 | |
c906108c SS |
385 | vec = 0x08 + irq; |
386 | isr = isrs[irq]; | |
387 | ||
388 | /* setup real mode handler */ | |
389 | _go32_dpmi_get_real_mode_interrupt_vector (vec, &intr->old_rmhandler); | |
390 | ||
c5aa993b JM |
391 | intr->new_rmhandler.pm_selector = _go32_my_cs (); |
392 | intr->new_rmhandler.pm_offset = (u_long) isr; | |
c906108c SS |
393 | if (_go32_dpmi_allocate_real_mode_callback_iret (&intr->new_rmhandler, |
394 | &intr->regs)) | |
395 | { | |
396 | return 0; | |
397 | } | |
398 | ||
399 | if (_go32_dpmi_set_real_mode_interrupt_vector (vec, &intr->new_rmhandler)) | |
400 | { | |
401 | return 0; | |
402 | } | |
c5aa993b | 403 | |
c906108c | 404 | /* setup protected mode handler */ |
c5aa993b | 405 | _go32_dpmi_get_protected_mode_interrupt_vector (vec, &intr->old_pmhandler); |
c906108c | 406 | |
c5aa993b JM |
407 | intr->new_pmhandler.pm_selector = _go32_my_cs (); |
408 | intr->new_pmhandler.pm_offset = (u_long) isr; | |
c906108c SS |
409 | _go32_dpmi_allocate_iret_wrapper (&intr->new_pmhandler); |
410 | ||
4d277981 EZ |
411 | if (_go32_dpmi_set_protected_mode_interrupt_vector (vec, |
412 | &intr->new_pmhandler)) | |
c906108c SS |
413 | { |
414 | return 0; | |
415 | } | |
416 | ||
417 | /* setup interrupt controller mask */ | |
418 | disable (); | |
419 | outportb (ICU_MASK, inportb (ICU_MASK) & ~(1 << irq)); | |
420 | enable (); | |
421 | ||
422 | intr->inuse = 1; | |
423 | return intr; | |
424 | } | |
425 | ||
426 | ||
427 | static void | |
fba45db2 | 428 | dos_unhookirq (struct intrupt *intr) |
c906108c SS |
429 | { |
430 | unsigned int irq, vec; | |
431 | unsigned char mask; | |
432 | ||
433 | irq = intr - intrupts; | |
434 | vec = 0x08 + irq; | |
435 | ||
436 | /* restore old interrupt mask bit */ | |
437 | mask = 1 << irq; | |
438 | disable (); | |
439 | outportb (ICU_MASK, inportb (ICU_MASK) | (mask & icu_oldmask)); | |
440 | enable (); | |
441 | ||
442 | /* remove real mode handler */ | |
443 | _go32_dpmi_set_real_mode_interrupt_vector (vec, &intr->old_rmhandler); | |
444 | _go32_dpmi_free_real_mode_callback (&intr->new_rmhandler); | |
c5aa993b | 445 | |
c906108c SS |
446 | /* remove protected mode handler */ |
447 | _go32_dpmi_set_protected_mode_interrupt_vector (vec, &intr->old_pmhandler); | |
448 | _go32_dpmi_free_iret_wrapper (&intr->new_pmhandler); | |
449 | intr->inuse = 0; | |
450 | } | |
c906108c SS |
451 | \f |
452 | ||
c5aa993b | 453 | |
c906108c | 454 | static int |
819cc324 | 455 | dos_open (struct serial *scb, const char *name) |
c906108c SS |
456 | { |
457 | struct dos_ttystate *port; | |
458 | int fd, i; | |
459 | ||
460 | if (strncasecmp (name, "/dev/", 5) == 0) | |
461 | name += 5; | |
462 | else if (strncasecmp (name, "\\dev\\", 5) == 0) | |
463 | name += 5; | |
464 | ||
465 | if (strlen (name) != 4 || strncasecmp (name, "com", 3) != 0) | |
466 | { | |
467 | errno = ENOENT; | |
468 | return -1; | |
469 | } | |
470 | ||
471 | if (name[3] < '1' || name[3] > '4') | |
472 | { | |
473 | errno = ENOENT; | |
474 | return -1; | |
475 | } | |
476 | ||
dfed996b EZ |
477 | /* FIXME: this is a Bad Idea (tm)! One should *never* invent file |
478 | handles, since they might be already used by other files/devices. | |
479 | The Right Way to do this is to create a real handle by dup()'ing | |
480 | some existing one. */ | |
c906108c SS |
481 | fd = name[3] - '1'; |
482 | port = &ports[fd]; | |
483 | if (port->refcnt++ > 0) | |
484 | { | |
485 | /* Device already opened another user. Just point at it. */ | |
486 | scb->fd = fd; | |
487 | return 0; | |
488 | } | |
489 | ||
490 | /* force access to ID reg */ | |
c5aa993b JM |
491 | outb (port, com_cfcr, 0); |
492 | outb (port, com_iir, 0); | |
493 | for (i = 0; i < 17; i++) | |
494 | { | |
495 | if ((inb (port, com_iir) & 0x38) == 0) | |
496 | goto ok; | |
497 | (void) inb (port, com_data); /* clear recv */ | |
498 | } | |
c906108c SS |
499 | errno = ENODEV; |
500 | return -1; | |
501 | ||
502 | ok: | |
503 | /* disable all interrupts in chip */ | |
c5aa993b | 504 | outb (port, com_ier, 0); |
c906108c SS |
505 | |
506 | /* tentatively enable 16550 fifo, and see if it responds */ | |
4d277981 EZ |
507 | outb (port, com_fifo, |
508 | FIFO_ENABLE | FIFO_RCV_RST | FIFO_XMT_RST | FIFO_TRIGGER); | |
c5aa993b JM |
509 | sleep (1); |
510 | port->fifo = ((inb (port, com_iir) & IIR_FIFO_MASK) == IIR_FIFO_MASK); | |
c906108c SS |
511 | |
512 | /* clear pending status reports. */ | |
c5aa993b JM |
513 | (void) inb (port, com_lsr); |
514 | (void) inb (port, com_msr); | |
c906108c SS |
515 | |
516 | /* enable external interrupt gate (to avoid floating IRQ) */ | |
c5aa993b | 517 | outb (port, com_mcr, MCR_IENABLE); |
c906108c SS |
518 | |
519 | /* hook up interrupt handler and initialise icu */ | |
520 | port->intrupt = dos_hookirq (port->irq); | |
521 | if (!port->intrupt) | |
522 | { | |
c5aa993b JM |
523 | outb (port, com_mcr, 0); |
524 | outb (port, com_fifo, 0); | |
c906108c SS |
525 | errno = ENODEV; |
526 | return -1; | |
527 | } | |
528 | ||
529 | disable (); | |
530 | ||
531 | /* record port */ | |
c5aa993b | 532 | port->intrupt->port = port; |
c906108c SS |
533 | scb->fd = fd; |
534 | ||
535 | /* clear rx buffer, tx busy flag and overflow count */ | |
536 | port->first = port->count = 0; | |
537 | port->txbusy = 0; | |
538 | port->oflo = 0; | |
539 | ||
540 | /* set default baud rate and mode: 9600,8,n,1 */ | |
541 | i = dos_baudconv (port->baudrate = 9600); | |
c5aa993b JM |
542 | outb (port, com_cfcr, CFCR_DLAB); |
543 | outb (port, com_dlbl, i & 0xff); | |
544 | outb (port, com_dlbh, i >> 8); | |
545 | outb (port, com_cfcr, CFCR_8BITS); | |
c906108c SS |
546 | |
547 | /* enable all interrupts */ | |
c5aa993b | 548 | outb (port, com_ier, IER_ETXRDY | IER_ERXRDY | IER_ERLS | IER_EMSC); |
c906108c SS |
549 | |
550 | /* enable DTR & RTS */ | |
c5aa993b | 551 | outb (port, com_mcr, MCR_DTR | MCR_RTS | MCR_IENABLE); |
c906108c SS |
552 | |
553 | enable (); | |
554 | ||
555 | return 0; | |
556 | } | |
557 | ||
558 | ||
559 | static void | |
819cc324 | 560 | dos_close (struct serial *scb) |
c906108c | 561 | { |
c5aa993b JM |
562 | struct dos_ttystate *port; |
563 | struct intrupt *intrupt; | |
c906108c | 564 | |
c5aa993b JM |
565 | if (!scb) |
566 | return; | |
567 | ||
568 | port = &ports[scb->fd]; | |
569 | ||
570 | if (port->refcnt-- > 1) | |
571 | return; | |
c906108c | 572 | |
c5aa993b JM |
573 | if (!(intrupt = port->intrupt)) |
574 | return; | |
575 | ||
576 | /* disable interrupts, fifo, flow control */ | |
577 | disable (); | |
578 | port->intrupt = 0; | |
579 | intrupt->port = 0; | |
580 | outb (port, com_fifo, 0); | |
581 | outb (port, com_ier, 0); | |
582 | enable (); | |
583 | ||
584 | /* unhook handler, and disable interrupt gate */ | |
585 | dos_unhookirq (intrupt); | |
586 | outb (port, com_mcr, 0); | |
587 | ||
588 | /* Check for overflow errors */ | |
589 | if (port->oflo) | |
590 | { | |
591 | fprintf_unfiltered (gdb_stderr, | |
592 | "Serial input overruns occurred.\n"); | |
593 | fprintf_unfiltered (gdb_stderr, "This system %s handle %d baud.\n", | |
594 | port->fifo ? "cannot" : "needs a 16550 to", | |
595 | port->baudrate); | |
596 | } | |
597 | } | |
c906108c SS |
598 | \f |
599 | ||
c5aa993b | 600 | |
c906108c | 601 | static int |
819cc324 | 602 | dos_noop (struct serial *scb) |
c906108c SS |
603 | { |
604 | return 0; | |
605 | } | |
606 | ||
607 | static void | |
819cc324 | 608 | dos_raw (struct serial *scb) |
c906108c SS |
609 | { |
610 | /* Always in raw mode */ | |
611 | } | |
612 | ||
613 | static int | |
819cc324 | 614 | dos_readchar (struct serial *scb, int timeout) |
c906108c SS |
615 | { |
616 | struct dos_ttystate *port = &ports[scb->fd]; | |
617 | long then; | |
618 | int c; | |
619 | ||
c5aa993b | 620 | then = rawclock () + (timeout * RAWHZ); |
c906108c SS |
621 | while ((c = dos_getc (port)) < 0) |
622 | { | |
623 | if (timeout >= 0 && (rawclock () - then) >= 0) | |
624 | return SERIAL_TIMEOUT; | |
c906108c SS |
625 | } |
626 | ||
627 | return c; | |
628 | } | |
629 | ||
630 | ||
631 | static serial_ttystate | |
819cc324 | 632 | dos_get_tty_state (struct serial *scb) |
c906108c SS |
633 | { |
634 | struct dos_ttystate *port = &ports[scb->fd]; | |
635 | struct dos_ttystate *state; | |
636 | ||
dfed996b EZ |
637 | /* Are they asking about a port we opened? */ |
638 | if (port->refcnt <= 0) | |
639 | { | |
640 | /* We've never heard about this port. We should fail this call, | |
641 | unless they are asking about one of the 3 standard handles, | |
642 | in which case we pretend the handle was open by us if it is | |
643 | connected to a terminal device. This is beacuse Unix | |
644 | terminals use the serial interface, so GDB expects the | |
645 | standard handles to go through here. */ | |
646 | if (scb->fd >= 3 || !isatty (scb->fd)) | |
647 | return NULL; | |
648 | } | |
649 | ||
c906108c SS |
650 | state = (struct dos_ttystate *) xmalloc (sizeof *state); |
651 | *state = *port; | |
652 | return (serial_ttystate) state; | |
653 | } | |
654 | ||
655 | static int | |
819cc324 | 656 | dos_set_tty_state (struct serial *scb, serial_ttystate ttystate) |
c906108c SS |
657 | { |
658 | struct dos_ttystate *state; | |
659 | ||
660 | state = (struct dos_ttystate *) ttystate; | |
661 | dos_setbaudrate (scb, state->baudrate); | |
662 | return 0; | |
663 | } | |
664 | ||
665 | static int | |
819cc324 | 666 | dos_noflush_set_tty_state (struct serial *scb, serial_ttystate new_ttystate, |
4d277981 | 667 | serial_ttystate old_ttystate) |
c906108c SS |
668 | { |
669 | struct dos_ttystate *state; | |
670 | ||
671 | state = (struct dos_ttystate *) new_ttystate; | |
672 | dos_setbaudrate (scb, state->baudrate); | |
673 | return 0; | |
674 | } | |
675 | ||
676 | static int | |
819cc324 | 677 | dos_flush_input (struct serial *scb) |
c906108c SS |
678 | { |
679 | struct dos_ttystate *port = &ports[scb->fd]; | |
433759f7 | 680 | |
c5aa993b | 681 | disable (); |
c906108c SS |
682 | port->first = port->count = 0; |
683 | if (port->fifo) | |
c5aa993b JM |
684 | outb (port, com_fifo, FIFO_ENABLE | FIFO_RCV_RST | FIFO_TRIGGER); |
685 | enable (); | |
9d271fd8 | 686 | return 0; |
c906108c SS |
687 | } |
688 | ||
689 | static void | |
819cc324 | 690 | dos_print_tty_state (struct serial *scb, serial_ttystate ttystate, |
4d277981 | 691 | struct ui_file *stream) |
c906108c SS |
692 | { |
693 | /* Nothing to print */ | |
694 | return; | |
695 | } | |
696 | ||
697 | static int | |
fba45db2 | 698 | dos_baudconv (int rate) |
c906108c SS |
699 | { |
700 | long x, err; | |
c5aa993b JM |
701 | |
702 | if (rate <= 0) | |
c906108c SS |
703 | return -1; |
704 | ||
4d277981 | 705 | #define divrnd(n, q) (((n) * 2 / (q) + 1) / 2) /* divide and round off */ |
c5aa993b | 706 | x = divrnd (COMTICK, rate); |
c906108c SS |
707 | if (x <= 0) |
708 | return -1; | |
c5aa993b JM |
709 | |
710 | err = divrnd (1000 * COMTICK, x * rate) - 1000; | |
c906108c SS |
711 | if (err < 0) |
712 | err = -err; | |
713 | if (err > SPEED_TOLERANCE) | |
714 | return -1; | |
715 | #undef divrnd | |
716 | return x; | |
717 | } | |
718 | ||
719 | ||
720 | static int | |
819cc324 | 721 | dos_setbaudrate (struct serial *scb, int rate) |
c906108c | 722 | { |
c5aa993b | 723 | struct dos_ttystate *port = &ports[scb->fd]; |
c906108c | 724 | |
c5aa993b JM |
725 | if (port->baudrate != rate) |
726 | { | |
727 | int x; | |
728 | unsigned char cfcr; | |
729 | ||
730 | x = dos_baudconv (rate); | |
731 | if (x <= 0) | |
732 | { | |
733 | fprintf_unfiltered (gdb_stderr, "%d: impossible baudrate\n", rate); | |
734 | errno = EINVAL; | |
735 | return -1; | |
736 | } | |
737 | ||
738 | disable (); | |
739 | cfcr = inb (port, com_cfcr); | |
740 | ||
741 | outb (port, com_cfcr, CFCR_DLAB); | |
742 | outb (port, com_dlbl, x & 0xff); | |
743 | outb (port, com_dlbh, x >> 8); | |
744 | outb (port, com_cfcr, cfcr); | |
745 | port->baudrate = rate; | |
746 | enable (); | |
747 | } | |
748 | ||
749 | return 0; | |
c906108c SS |
750 | } |
751 | ||
752 | static int | |
819cc324 | 753 | dos_setstopbits (struct serial *scb, int num) |
c906108c | 754 | { |
c5aa993b JM |
755 | struct dos_ttystate *port = &ports[scb->fd]; |
756 | unsigned char cfcr; | |
c906108c | 757 | |
c5aa993b JM |
758 | disable (); |
759 | cfcr = inb (port, com_cfcr); | |
760 | ||
761 | switch (num) | |
762 | { | |
763 | case SERIAL_1_STOPBITS: | |
764 | outb (port, com_cfcr, cfcr & ~CFCR_STOPB); | |
765 | break; | |
766 | case SERIAL_1_AND_A_HALF_STOPBITS: | |
767 | case SERIAL_2_STOPBITS: | |
768 | outb (port, com_cfcr, cfcr | CFCR_STOPB); | |
769 | break; | |
770 | default: | |
771 | enable (); | |
772 | return 1; | |
773 | } | |
774 | enable (); | |
775 | ||
776 | return 0; | |
c906108c SS |
777 | } |
778 | ||
779 | static int | |
819cc324 | 780 | dos_write (struct serial *scb, const char *str, int len) |
c906108c SS |
781 | { |
782 | volatile struct dos_ttystate *port = &ports[scb->fd]; | |
783 | int fifosize = port->fifo ? 16 : 1; | |
784 | long then; | |
785 | int cnt; | |
786 | ||
c5aa993b JM |
787 | while (len > 0) |
788 | { | |
789 | /* send the data, fifosize bytes at a time */ | |
790 | cnt = fifosize > len ? len : fifosize; | |
791 | port->txbusy = 1; | |
cd42d3a8 EZ |
792 | /* Francisco Pastor <fpastor.etra-id@etra.es> says OUTSB messes |
793 | up the communications with UARTs with FIFOs. */ | |
794 | #ifdef UART_FIFO_WORKS | |
c5aa993b JM |
795 | outportsb (port->base + com_data, str, cnt); |
796 | str += cnt; | |
797 | len -= cnt; | |
cd42d3a8 EZ |
798 | #else |
799 | for ( ; cnt > 0; cnt--, len--) | |
800 | outportb (port->base + com_data, *str++); | |
801 | #endif | |
c906108c | 802 | #ifdef DOS_STATS |
c5aa993b | 803 | cnts[CNT_TX] += cnt; |
c906108c | 804 | #endif |
c5aa993b JM |
805 | /* wait for transmission to complete (max 1 sec) */ |
806 | then = rawclock () + RAWHZ; | |
807 | while (port->txbusy) | |
808 | { | |
809 | if ((rawclock () - then) >= 0) | |
810 | { | |
811 | errno = EIO; | |
812 | return SERIAL_ERROR; | |
813 | } | |
814 | } | |
c906108c SS |
815 | } |
816 | return 0; | |
817 | } | |
818 | ||
819 | ||
820 | static int | |
819cc324 | 821 | dos_sendbreak (struct serial *scb) |
c906108c SS |
822 | { |
823 | volatile struct dos_ttystate *port = &ports[scb->fd]; | |
824 | unsigned char cfcr; | |
825 | long then; | |
826 | ||
c5aa993b JM |
827 | cfcr = inb (port, com_cfcr); |
828 | outb (port, com_cfcr, cfcr | CFCR_SBREAK); | |
c906108c SS |
829 | |
830 | /* 0.25 sec delay */ | |
831 | then = rawclock () + RAWHZ / 4; | |
832 | while ((rawclock () - then) < 0) | |
833 | continue; | |
834 | ||
c5aa993b | 835 | outb (port, com_cfcr, cfcr); |
c906108c SS |
836 | return 0; |
837 | } | |
838 | ||
839 | ||
840 | static struct serial_ops dos_ops = | |
841 | { | |
842 | "hardwire", | |
843 | 0, | |
844 | dos_open, | |
845 | dos_close, | |
c1b5be38 | 846 | NULL, /* fdopen, not implemented */ |
c906108c SS |
847 | dos_readchar, |
848 | dos_write, | |
849 | dos_noop, /* flush output */ | |
850 | dos_flush_input, | |
851 | dos_sendbreak, | |
852 | dos_raw, | |
853 | dos_get_tty_state, | |
854 | dos_set_tty_state, | |
855 | dos_print_tty_state, | |
856 | dos_noflush_set_tty_state, | |
857 | dos_setbaudrate, | |
858 | dos_setstopbits, | |
859 | dos_noop, /* wait for output to drain */ | |
819cc324 | 860 | (void (*)(struct serial *, int))NULL /* change into async mode */ |
c906108c SS |
861 | }; |
862 | ||
58f07bae PA |
863 | int |
864 | gdb_pipe (int pdes[2]) | |
865 | { | |
866 | /* No support for pipes. */ | |
867 | errno = ENOSYS; | |
868 | return -1; | |
869 | } | |
c906108c SS |
870 | |
871 | static void | |
4d277981 | 872 | dos_info (char *arg, int from_tty) |
c906108c SS |
873 | { |
874 | struct dos_ttystate *port; | |
263fe37d | 875 | #ifdef DOS_STATS |
c906108c | 876 | int i; |
263fe37d | 877 | #endif |
c906108c | 878 | |
c5aa993b | 879 | for (port = ports; port < &ports[4]; port++) |
c906108c SS |
880 | { |
881 | if (port->baudrate == 0) | |
882 | continue; | |
263fe37d | 883 | printf_filtered ("Port:\tCOM%ld (%sactive)\n", (long)(port - ports) + 1, |
c906108c SS |
884 | port->intrupt ? "" : "not "); |
885 | printf_filtered ("Addr:\t0x%03x (irq %d)\n", port->base, port->irq); | |
886 | printf_filtered ("16550:\t%s\n", port->fifo ? "yes" : "no"); | |
887 | printf_filtered ("Speed:\t%d baud\n", port->baudrate); | |
c5aa993b | 888 | printf_filtered ("Errs:\tframing %d parity %d overflow %d\n\n", |
c906108c SS |
889 | port->ferr, port->perr, port->oflo); |
890 | } | |
891 | ||
892 | #ifdef DOS_STATS | |
893 | printf_filtered ("\nTotal interrupts: %d\n", intrcnt); | |
894 | for (i = 0; i < NCNT; i++) | |
895 | if (cnts[i]) | |
896 | printf_filtered ("%s:\t%d\n", cntnames[i], cnts[i]); | |
897 | #endif | |
898 | } | |
899 | ||
900 | ||
901 | void | |
fba45db2 | 902 | _initialize_ser_dos (void) |
c906108c | 903 | { |
c906108c SS |
904 | serial_add_interface (&dos_ops); |
905 | ||
906 | /* Save original interrupt mask register. */ | |
907 | icu_oldmask = inportb (ICU_MASK); | |
908 | ||
909 | /* Mark fixed motherboard irqs as inuse. */ | |
910 | intrupts[0].inuse = /* timer tick */ | |
911 | intrupts[1].inuse = /* keyboard */ | |
c5aa993b JM |
912 | intrupts[2].inuse = 1; /* slave icu */ |
913 | ||
85c07804 AC |
914 | add_setshow_zinteger_cmd ("com1base", class_obscure, &ports[0].base, _("\ |
915 | Set COM1 base i/o port address."), _("\ | |
916 | Show COM1 base i/o port address."), NULL, | |
917 | NULL, | |
918 | NULL, /* FIXME: i18n: */ | |
919 | &setlist, &showlist); | |
920 | ||
921 | add_setshow_zinteger_cmd ("com1irq", class_obscure, &ports[0].irq, _("\ | |
922 | Set COM1 interrupt request."), _("\ | |
923 | Show COM1 interrupt request."), NULL, | |
924 | NULL, | |
925 | NULL, /* FIXME: i18n: */ | |
926 | &setlist, &showlist); | |
927 | ||
928 | add_setshow_zinteger_cmd ("com2base", class_obscure, &ports[1].base, _("\ | |
929 | Set COM2 base i/o port address."), _("\ | |
930 | Show COM2 base i/o port address."), NULL, | |
931 | NULL, | |
932 | NULL, /* FIXME: i18n: */ | |
933 | &setlist, &showlist); | |
934 | ||
935 | add_setshow_zinteger_cmd ("com2irq", class_obscure, &ports[1].irq, _("\ | |
936 | Set COM2 interrupt request."), _("\ | |
937 | Show COM2 interrupt request."), NULL, | |
938 | NULL, | |
939 | NULL, /* FIXME: i18n: */ | |
940 | &setlist, &showlist); | |
941 | ||
942 | add_setshow_zinteger_cmd ("com3base", class_obscure, &ports[2].base, _("\ | |
943 | Set COM3 base i/o port address."), _("\ | |
944 | Show COM3 base i/o port address."), NULL, | |
945 | NULL, | |
946 | NULL, /* FIXME: i18n: */ | |
947 | &setlist, &showlist); | |
948 | ||
949 | add_setshow_zinteger_cmd ("com3irq", class_obscure, &ports[2].irq, _("\ | |
950 | Set COM3 interrupt request."), _("\ | |
951 | Show COM3 interrupt request."), NULL, | |
952 | NULL, | |
953 | NULL, /* FIXME: i18n: */ | |
954 | &setlist, &showlist); | |
955 | ||
956 | add_setshow_zinteger_cmd ("com4base", class_obscure, &ports[3].base, _("\ | |
957 | Set COM4 base i/o port address."), _("\ | |
958 | Show COM4 base i/o port address."), NULL, | |
959 | NULL, | |
960 | NULL, /* FIXME: i18n: */ | |
961 | &setlist, &showlist); | |
962 | ||
963 | add_setshow_zinteger_cmd ("com4irq", class_obscure, &ports[3].irq, _("\ | |
964 | Set COM4 interrupt request."), _("\ | |
965 | Show COM4 interrupt request."), NULL, | |
966 | NULL, | |
967 | NULL, /* FIXME: i18n: */ | |
968 | &setlist, &showlist); | |
c906108c SS |
969 | |
970 | add_info ("serial", dos_info, | |
1bedd215 | 971 | _("Print DOS serial port status.")); |
c906108c | 972 | } |