| 1 | /* Remote serial interface for local (hardwired) serial ports for |
| 2 | GO32. Copyright 1992, 1993 Free Software Foundation, Inc. |
| 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 |
| 23 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ |
| 24 | |
| 25 | #include "defs.h" |
| 26 | #include "gdbcmd.h" |
| 27 | #include "serial.h" |
| 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 | |
| 129 | #include <sys/dos.h> |
| 130 | #include <sys/go32.h> |
| 131 | #include <sys/dpmi.h> |
| 132 | |
| 133 | /* DPMI Communication */ |
| 134 | static union REGS dpmi_regs; |
| 135 | static struct SREGS dpmi_sregs; |
| 136 | |
| 137 | /* 16550 rx fifo trigger point */ |
| 138 | #define FIFO_TRIGGER FIFO_TRIGGER_4 |
| 139 | |
| 140 | /* input buffer size */ |
| 141 | #define CBSIZE 4096 |
| 142 | |
| 143 | /* return raw 18Hz clock count */ |
| 144 | extern long rawclock (void); |
| 145 | |
| 146 | #define RAWHZ 18 |
| 147 | |
| 148 | #ifdef DOS_STATS |
| 149 | #define CNT_RX 16 |
| 150 | #define CNT_TX 17 |
| 151 | #define CNT_STRAY 18 |
| 152 | #define CNT_ORUN 19 |
| 153 | #define NCNT 20 |
| 154 | |
| 155 | static int intrcnt; |
| 156 | static int cnts[NCNT]; |
| 157 | static char *cntnames[NCNT] = { |
| 158 | /* h/w interrupt counts. */ |
| 159 | "mlsc", "nopend", "txrdy", "?3", |
| 160 | "rxrdy", "?5", "rls", "?7", |
| 161 | "?8", "?9", "?a", "?b", |
| 162 | "rxtout", "?d", "?e", "?f", |
| 163 | /* s/w counts. */ |
| 164 | "rxcnt", "txcnt", "stray", "swoflo" |
| 165 | }; |
| 166 | |
| 167 | #define COUNT(x) cnts[x]++ |
| 168 | #else |
| 169 | #define COUNT(x) |
| 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. */ |
| 178 | unsigned char icu_oldmask; |
| 179 | |
| 180 | /* Maximum of 8 interrupts (we don't handle the slave icu yet). */ |
| 181 | #define NINTR 8 |
| 182 | |
| 183 | static struct intrupt |
| 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 | } intrupts[NINTR]; |
| 193 | |
| 194 | |
| 195 | static struct dos_ttystate |
| 196 | { |
| 197 | int base; |
| 198 | int irq; |
| 199 | int refcnt; |
| 200 | struct intrupt *intrupt; |
| 201 | int fifo; |
| 202 | int baudrate; |
| 203 | unsigned char cbuf[CBSIZE]; |
| 204 | unsigned int first; |
| 205 | unsigned int count; |
| 206 | int txbusy; |
| 207 | unsigned char old_mcr; |
| 208 | int ferr; |
| 209 | int perr; |
| 210 | int oflo; |
| 211 | int msr; |
| 212 | } ports[4] = { |
| 213 | {COM1ADDR, 4}, |
| 214 | {COM2ADDR, 3}, |
| 215 | {COM3ADDR, 4}, |
| 216 | {COM4ADDR, 3} |
| 217 | }; |
| 218 | |
| 219 | static int dos_open PARAMS ((serial_t scb, const char *name)); |
| 220 | static void dos_raw PARAMS ((serial_t scb)); |
| 221 | static int dos_readchar PARAMS ((serial_t scb, int timeout)); |
| 222 | static int dos_setbaudrate PARAMS ((serial_t scb, int rate)); |
| 223 | static int dos_write PARAMS ((serial_t scb, const char *str, int len)); |
| 224 | static void dos_close PARAMS ((serial_t scb)); |
| 225 | static serial_ttystate dos_get_tty_state PARAMS ((serial_t scb)); |
| 226 | static int dos_set_tty_state PARAMS ((serial_t scb, serial_ttystate state)); |
| 227 | static int dos_baudconv PARAMS ((int rate)); |
| 228 | |
| 229 | #define inb(p,a) inportb((p)->base + (a)) |
| 230 | #define outb(p,a,v) outportb((p)->base + (a), (v)) |
| 231 | #define disable() asm volatile ("cli"); |
| 232 | #define enable() asm volatile ("sti"); |
| 233 | |
| 234 | |
| 235 | static int |
| 236 | dos_getc (port) |
| 237 | volatile struct dos_ttystate *port; |
| 238 | { |
| 239 | int c; |
| 240 | |
| 241 | if (port->count == 0) |
| 242 | return -1; |
| 243 | |
| 244 | c = port->cbuf[port->first]; |
| 245 | disable (); |
| 246 | port->first = (port->first + 1) & (CBSIZE - 1); |
| 247 | port->count--; |
| 248 | enable (); |
| 249 | return c; |
| 250 | } |
| 251 | |
| 252 | |
| 253 | static int |
| 254 | dos_putc (c, port) |
| 255 | int c; |
| 256 | struct dos_ttystate *port; |
| 257 | { |
| 258 | if (port->count >= CBSIZE - 1) |
| 259 | return -1; |
| 260 | port->cbuf[(port->first + port->count) & (CBSIZE - 1)] = c; |
| 261 | port->count++; |
| 262 | return 0; |
| 263 | } |
| 264 | |
| 265 | \f |
| 266 | |
| 267 | static void |
| 268 | dos_comisr (irq) |
| 269 | int irq; |
| 270 | { |
| 271 | struct dos_ttystate *port; |
| 272 | unsigned char iir, lsr, c; |
| 273 | |
| 274 | disable (); /* Paranoia */ |
| 275 | outportb (ICU_OCW2, 0x20); /* End-Of-Interrupt */ |
| 276 | #ifdef DOS_STATS |
| 277 | ++intrcnt; |
| 278 | #endif |
| 279 | |
| 280 | port = intrupts[irq].port; |
| 281 | if (!port) |
| 282 | { |
| 283 | COUNT (CNT_STRAY); |
| 284 | return; /* not open */ |
| 285 | } |
| 286 | |
| 287 | while (1) |
| 288 | { |
| 289 | iir = inb (port, com_iir) & IIR_IMASK; |
| 290 | switch (iir) |
| 291 | { |
| 292 | |
| 293 | case IIR_RLS: |
| 294 | lsr = inb (port, com_lsr); |
| 295 | goto rx; |
| 296 | |
| 297 | case IIR_RXTOUT: |
| 298 | case IIR_RXRDY: |
| 299 | lsr = 0; |
| 300 | |
| 301 | rx: |
| 302 | do |
| 303 | { |
| 304 | c = inb (port, com_data); |
| 305 | if (lsr & (LSR_BI | LSR_FE | LSR_PE | LSR_OE)) |
| 306 | { |
| 307 | if (lsr & (LSR_BI | LSR_FE)) |
| 308 | port->ferr++; |
| 309 | else if (lsr & LSR_PE) |
| 310 | port->perr++; |
| 311 | if (lsr & LSR_OE) |
| 312 | port->oflo++; |
| 313 | } |
| 314 | |
| 315 | if (dos_putc (c, port) < 0) |
| 316 | { |
| 317 | COUNT (CNT_ORUN); |
| 318 | } |
| 319 | else |
| 320 | { |
| 321 | COUNT (CNT_RX); |
| 322 | } |
| 323 | } |
| 324 | while ((lsr = inb (port, com_lsr)) & LSR_RXRDY); |
| 325 | break; |
| 326 | |
| 327 | case IIR_MLSC: |
| 328 | /* could be used to flowcontrol Tx */ |
| 329 | port->msr = inb (port, com_msr); |
| 330 | break; |
| 331 | |
| 332 | case IIR_TXRDY: |
| 333 | port->txbusy = 0; |
| 334 | break; |
| 335 | |
| 336 | case IIR_NOPEND: |
| 337 | /* no more pending interrupts, all done */ |
| 338 | return; |
| 339 | |
| 340 | default: |
| 341 | /* unexpected interrupt, ignore */ |
| 342 | break; |
| 343 | } |
| 344 | COUNT (iir); |
| 345 | } |
| 346 | } |
| 347 | |
| 348 | #ifdef __STDC__ |
| 349 | #define ISRNAME(x) dos_comisr##x |
| 350 | #else |
| 351 | #define ISRNAME(x) dos_comisr/**/x |
| 352 | #endif |
| 353 | #define ISR(x) static void ISRNAME(x)() {dos_comisr(x);} |
| 354 | |
| 355 | ISR(0) ISR(1) ISR(2) ISR(3) |
| 356 | ISR(4) ISR(5) ISR(6) ISR(7) |
| 357 | |
| 358 | typedef void (*isr_t)(); |
| 359 | |
| 360 | static isr_t isrs[NINTR] = { |
| 361 | ISRNAME(0), ISRNAME(1), ISRNAME(2), ISRNAME(3), |
| 362 | ISRNAME(4), ISRNAME(5), ISRNAME(6), ISRNAME(7) |
| 363 | }; |
| 364 | |
| 365 | \f |
| 366 | |
| 367 | static struct intrupt * |
| 368 | dos_hookirq (irq) |
| 369 | unsigned int irq; |
| 370 | { |
| 371 | struct intrupt *intr; |
| 372 | unsigned int vec; |
| 373 | isr_t isr; |
| 374 | |
| 375 | if (irq >= NINTR) |
| 376 | return 0; |
| 377 | |
| 378 | intr = &intrupts[irq]; |
| 379 | if (intr->inuse) |
| 380 | return 0; |
| 381 | |
| 382 | vec = 0x08 + irq; |
| 383 | isr = isrs[irq]; |
| 384 | |
| 385 | /* setup real mode handler */ |
| 386 | _go32_dpmi_get_real_mode_interrupt_vector (vec, &intr->old_rmhandler); |
| 387 | |
| 388 | intr->new_rmhandler.pm_selector = _go32_my_cs(); |
| 389 | intr->new_rmhandler.pm_offset = (u_long)isr; |
| 390 | if (_go32_dpmi_allocate_real_mode_callback_iret (&intr->new_rmhandler, |
| 391 | &intr->regs)) |
| 392 | { |
| 393 | return 0; |
| 394 | } |
| 395 | |
| 396 | if (_go32_dpmi_set_real_mode_interrupt_vector (vec, &intr->new_rmhandler)) |
| 397 | { |
| 398 | return 0; |
| 399 | } |
| 400 | |
| 401 | /* setup protected mode handler */ |
| 402 | _go32_dpmi_get_protected_mode_interrupt_vector(vec, &intr->old_pmhandler); |
| 403 | |
| 404 | intr->new_pmhandler.pm_selector = _go32_my_cs(); |
| 405 | intr->new_pmhandler.pm_offset = (u_long)isr; |
| 406 | _go32_dpmi_allocate_iret_wrapper (&intr->new_pmhandler); |
| 407 | |
| 408 | if (_go32_dpmi_set_protected_mode_interrupt_vector(vec, &intr->new_pmhandler)) |
| 409 | { |
| 410 | return 0; |
| 411 | } |
| 412 | |
| 413 | /* setup interrupt controller mask */ |
| 414 | disable (); |
| 415 | outportb (ICU_MASK, inportb (ICU_MASK) & ~(1 << irq)); |
| 416 | enable (); |
| 417 | |
| 418 | intr->inuse = 1; |
| 419 | return intr; |
| 420 | } |
| 421 | |
| 422 | |
| 423 | static void |
| 424 | dos_unhookirq (intr) |
| 425 | struct intrupt *intr; |
| 426 | { |
| 427 | unsigned int irq, vec; |
| 428 | unsigned char mask; |
| 429 | |
| 430 | irq = intr - intrupts; |
| 431 | vec = 0x08 + irq; |
| 432 | |
| 433 | /* restore old interrupt mask bit */ |
| 434 | mask = 1 << irq; |
| 435 | disable (); |
| 436 | outportb (ICU_MASK, inportb (ICU_MASK) | (mask & icu_oldmask)); |
| 437 | enable (); |
| 438 | |
| 439 | /* remove real mode handler */ |
| 440 | _go32_dpmi_set_real_mode_interrupt_vector (vec, &intr->old_rmhandler); |
| 441 | _go32_dpmi_free_real_mode_callback (&intr->new_rmhandler); |
| 442 | |
| 443 | /* remove protected mode handler */ |
| 444 | _go32_dpmi_set_protected_mode_interrupt_vector (vec, &intr->old_pmhandler); |
| 445 | _go32_dpmi_free_iret_wrapper (&intr->new_pmhandler); |
| 446 | intr->inuse = 0; |
| 447 | } |
| 448 | |
| 449 | \f |
| 450 | |
| 451 | static int |
| 452 | dos_open (scb, name) |
| 453 | serial_t scb; |
| 454 | const char *name; |
| 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 | |
| 476 | fd = name[3] - '1'; |
| 477 | port = &ports[fd]; |
| 478 | if (port->refcnt++ > 0) |
| 479 | { |
| 480 | /* Device already opened another user. Just point at it. */ |
| 481 | scb->fd = fd; |
| 482 | return 0; |
| 483 | } |
| 484 | |
| 485 | /* force access to ID reg */ |
| 486 | outb(port, com_cfcr, 0); |
| 487 | outb(port, com_iir, 0); |
| 488 | for (i = 0; i < 17; i++) { |
| 489 | if ((inb(port, com_iir) & 0x38) == 0) |
| 490 | goto ok; |
| 491 | (void) inb(port, com_data); /* clear recv */ |
| 492 | } |
| 493 | errno = ENODEV; |
| 494 | return -1; |
| 495 | |
| 496 | ok: |
| 497 | /* disable all interrupts in chip */ |
| 498 | outb(port, com_ier, 0); |
| 499 | |
| 500 | /* tentatively enable 16550 fifo, and see if it responds */ |
| 501 | outb(port, com_fifo, FIFO_ENABLE|FIFO_RCV_RST|FIFO_XMT_RST|FIFO_TRIGGER); |
| 502 | sleep(1); |
| 503 | port->fifo = ((inb(port, com_iir) & IIR_FIFO_MASK) == IIR_FIFO_MASK); |
| 504 | |
| 505 | /* clear pending status reports. */ |
| 506 | (void) inb(port, com_lsr); |
| 507 | (void) inb(port, com_msr); |
| 508 | |
| 509 | /* enable external interrupt gate (to avoid floating IRQ) */ |
| 510 | outb(port, com_mcr, MCR_IENABLE); |
| 511 | |
| 512 | /* hook up interrupt handler and initialise icu */ |
| 513 | port->intrupt = dos_hookirq (port->irq); |
| 514 | if (!port->intrupt) |
| 515 | { |
| 516 | outb(port, com_mcr, 0); |
| 517 | outb(port, com_fifo, 0); |
| 518 | errno = ENODEV; |
| 519 | return -1; |
| 520 | } |
| 521 | |
| 522 | disable (); |
| 523 | |
| 524 | /* record port */ |
| 525 | port->intrupt->port = port; |
| 526 | scb->fd = fd; |
| 527 | |
| 528 | /* clear rx buffer, tx busy flag and overflow count */ |
| 529 | port->first = port->count = 0; |
| 530 | port->txbusy = 0; |
| 531 | port->oflo = 0; |
| 532 | |
| 533 | /* set default baud rate and mode: 9600,8,n,1 */ |
| 534 | i = dos_baudconv (port->baudrate = 9600); |
| 535 | outb(port, com_cfcr, CFCR_DLAB); |
| 536 | outb(port, com_dlbl, i & 0xff); |
| 537 | outb(port, com_dlbh, i >> 8); |
| 538 | outb(port, com_cfcr, CFCR_8BITS); |
| 539 | |
| 540 | /* enable all interrupts */ |
| 541 | outb(port, com_ier, IER_ETXRDY | IER_ERXRDY | IER_ERLS | IER_EMSC); |
| 542 | |
| 543 | /* enable DTR & RTS */ |
| 544 | outb(port, com_mcr, MCR_DTR | MCR_RTS | MCR_IENABLE); |
| 545 | |
| 546 | enable (); |
| 547 | |
| 548 | return 0; |
| 549 | } |
| 550 | |
| 551 | |
| 552 | static void |
| 553 | dos_close (scb) |
| 554 | serial_t scb; |
| 555 | { |
| 556 | struct dos_ttystate *port; |
| 557 | struct intrupt *intrupt; |
| 558 | |
| 559 | if (!scb) |
| 560 | return; |
| 561 | |
| 562 | port = &ports[scb->fd]; |
| 563 | |
| 564 | if (port->refcnt-- > 1) |
| 565 | return; |
| 566 | |
| 567 | if (!(intrupt = port->intrupt)) |
| 568 | return; |
| 569 | |
| 570 | /* disable interrupts, fifo, flow control */ |
| 571 | disable (); |
| 572 | port->intrupt = 0; |
| 573 | intrupt->port = 0; |
| 574 | outb(port, com_fifo, 0); |
| 575 | outb(port, com_ier, 0); |
| 576 | enable (); |
| 577 | |
| 578 | /* unhook handler, and disable interrupt gate */ |
| 579 | dos_unhookirq (intrupt); |
| 580 | outb(port, com_mcr, 0); |
| 581 | |
| 582 | /* Check for overflow errors */ |
| 583 | if (port->oflo) |
| 584 | { |
| 585 | fprintf_unfiltered (gdb_stderr, |
| 586 | "Serial input overruns occurred.\n"); |
| 587 | fprintf_unfiltered (gdb_stderr, "This system %s handle %d baud.\n", |
| 588 | port->fifo ? "cannot" : "needs a 16550 to", |
| 589 | port->baudrate); |
| 590 | } |
| 591 | } |
| 592 | |
| 593 | \f |
| 594 | |
| 595 | static int |
| 596 | dos_noop (scb) |
| 597 | serial_t scb; |
| 598 | { |
| 599 | return 0; |
| 600 | } |
| 601 | |
| 602 | static void |
| 603 | dos_raw (scb) |
| 604 | serial_t scb; |
| 605 | { |
| 606 | /* Always in raw mode */ |
| 607 | } |
| 608 | |
| 609 | static int |
| 610 | dos_readchar (scb, timeout) |
| 611 | serial_t scb; |
| 612 | int timeout; |
| 613 | { |
| 614 | struct dos_ttystate *port = &ports[scb->fd]; |
| 615 | long then; |
| 616 | int c; |
| 617 | |
| 618 | then = rawclock() + (timeout * RAWHZ); |
| 619 | while ((c = dos_getc (port)) < 0) |
| 620 | { |
| 621 | if (timeout >= 0 && (rawclock () - then) >= 0) |
| 622 | return SERIAL_TIMEOUT; |
| 623 | notice_quit (); |
| 624 | } |
| 625 | |
| 626 | return c; |
| 627 | } |
| 628 | |
| 629 | |
| 630 | static serial_ttystate |
| 631 | dos_get_tty_state (scb) |
| 632 | serial_t scb; |
| 633 | { |
| 634 | struct dos_ttystate *port = &ports[scb->fd]; |
| 635 | struct dos_ttystate *state; |
| 636 | |
| 637 | state = (struct dos_ttystate *) xmalloc (sizeof *state); |
| 638 | *state = *port; |
| 639 | return (serial_ttystate) state; |
| 640 | } |
| 641 | |
| 642 | static int |
| 643 | dos_set_tty_state (scb, ttystate) |
| 644 | serial_t scb; |
| 645 | serial_ttystate ttystate; |
| 646 | { |
| 647 | struct dos_ttystate *state; |
| 648 | |
| 649 | state = (struct dos_ttystate *) ttystate; |
| 650 | dos_setbaudrate (scb, state->baudrate); |
| 651 | return 0; |
| 652 | } |
| 653 | |
| 654 | static int |
| 655 | dos_noflush_set_tty_state (scb, new_ttystate, old_ttystate) |
| 656 | serial_t scb; |
| 657 | serial_ttystate new_ttystate; |
| 658 | serial_ttystate old_ttystate; |
| 659 | { |
| 660 | struct dos_ttystate *state; |
| 661 | |
| 662 | state = (struct dos_ttystate *) new_ttystate; |
| 663 | dos_setbaudrate (scb, state->baudrate); |
| 664 | return 0; |
| 665 | } |
| 666 | |
| 667 | static int |
| 668 | dos_flush_input (scb) |
| 669 | serial_t scb; |
| 670 | { |
| 671 | struct dos_ttystate *port = &ports[scb->fd]; |
| 672 | disable(); |
| 673 | port->first = port->count = 0; |
| 674 | if (port->fifo) |
| 675 | outb(port, com_fifo, FIFO_ENABLE|FIFO_RCV_RST|FIFO_TRIGGER); |
| 676 | enable(); |
| 677 | } |
| 678 | |
| 679 | static void |
| 680 | dos_print_tty_state (scb, ttystate) |
| 681 | serial_t scb; |
| 682 | serial_ttystate ttystate; |
| 683 | { |
| 684 | /* Nothing to print */ |
| 685 | return; |
| 686 | } |
| 687 | |
| 688 | static int |
| 689 | dos_baudconv (rate) |
| 690 | int rate; |
| 691 | { |
| 692 | long x, err; |
| 693 | |
| 694 | if (rate <= 0) |
| 695 | return -1; |
| 696 | |
| 697 | #define divrnd(n, q) (((n) * 2 / (q) + 1) / 2) /* divide and round off */ |
| 698 | x = divrnd(COMTICK, rate); |
| 699 | if (x <= 0) |
| 700 | return -1; |
| 701 | |
| 702 | err = divrnd(1000 * COMTICK, x * rate) - 1000; |
| 703 | if (err < 0) |
| 704 | err = -err; |
| 705 | if (err > SPEED_TOLERANCE) |
| 706 | return -1; |
| 707 | #undef divrnd |
| 708 | return x; |
| 709 | } |
| 710 | |
| 711 | |
| 712 | static int |
| 713 | dos_setbaudrate (scb, rate) |
| 714 | serial_t scb; |
| 715 | int rate; |
| 716 | { |
| 717 | struct dos_ttystate *port = &ports[scb->fd]; |
| 718 | |
| 719 | if (port->baudrate != rate) |
| 720 | { |
| 721 | int x; |
| 722 | unsigned char cfcr; |
| 723 | |
| 724 | x = dos_baudconv (rate); |
| 725 | if (x <= 0) |
| 726 | { |
| 727 | fprintf_unfiltered (gdb_stderr, "%d: impossible baudrate\n", rate); |
| 728 | errno = EINVAL; |
| 729 | return -1; |
| 730 | } |
| 731 | |
| 732 | disable (); |
| 733 | cfcr = inb (port, com_cfcr); |
| 734 | |
| 735 | outb(port, com_cfcr, CFCR_DLAB); |
| 736 | outb(port, com_dlbl, x & 0xff); |
| 737 | outb(port, com_dlbh, x >> 8); |
| 738 | outb(port, com_cfcr, cfcr); |
| 739 | port->baudrate = rate; |
| 740 | enable (); |
| 741 | } |
| 742 | |
| 743 | return 0; |
| 744 | } |
| 745 | |
| 746 | static int |
| 747 | dos_setstopbits (scb, num) |
| 748 | serial_t scb; |
| 749 | int num; |
| 750 | { |
| 751 | struct dos_ttystate *port = &ports[scb->fd]; |
| 752 | unsigned char cfcr; |
| 753 | |
| 754 | disable (); |
| 755 | cfcr = inb (port, com_cfcr); |
| 756 | |
| 757 | switch (num) |
| 758 | { |
| 759 | case SERIAL_1_STOPBITS: |
| 760 | outb (port, com_cfcr, cfcr & ~CFCR_STOPB); |
| 761 | break; |
| 762 | case SERIAL_1_AND_A_HALF_STOPBITS: |
| 763 | case SERIAL_2_STOPBITS: |
| 764 | outb (port, com_cfcr, cfcr | CFCR_STOPB); |
| 765 | break; |
| 766 | default: |
| 767 | enable (); |
| 768 | return 1; |
| 769 | } |
| 770 | enable (); |
| 771 | |
| 772 | return 0; |
| 773 | } |
| 774 | |
| 775 | static int |
| 776 | dos_write (scb, str, len) |
| 777 | serial_t scb; |
| 778 | const char *str; |
| 779 | int len; |
| 780 | { |
| 781 | volatile struct dos_ttystate *port = &ports[scb->fd]; |
| 782 | int fifosize = port->fifo ? 16 : 1; |
| 783 | long then; |
| 784 | int cnt; |
| 785 | |
| 786 | while (len > 0) |
| 787 | { |
| 788 | /* send the data, fifosize bytes at a time */ |
| 789 | cnt = fifosize > len ? len : fifosize; |
| 790 | port->txbusy = 1; |
| 791 | outportsb (port->base + com_data, str, cnt); |
| 792 | str += cnt; |
| 793 | len -= cnt; |
| 794 | #ifdef DOS_STATS |
| 795 | cnts[CNT_TX] += cnt; |
| 796 | #endif |
| 797 | /* wait for transmission to complete (max 1 sec) */ |
| 798 | then = rawclock() + RAWHZ; |
| 799 | while (port->txbusy) |
| 800 | { |
| 801 | if ((rawclock () - then) >= 0) |
| 802 | { |
| 803 | errno = EIO; |
| 804 | return SERIAL_ERROR; |
| 805 | } |
| 806 | } |
| 807 | } |
| 808 | return 0; |
| 809 | } |
| 810 | |
| 811 | |
| 812 | static int |
| 813 | dos_sendbreak (scb) |
| 814 | serial_t scb; |
| 815 | { |
| 816 | volatile struct dos_ttystate *port = &ports[scb->fd]; |
| 817 | unsigned char cfcr; |
| 818 | long then; |
| 819 | |
| 820 | cfcr = inb(port, com_cfcr); |
| 821 | outb(port, com_cfcr, cfcr | CFCR_SBREAK); |
| 822 | |
| 823 | /* 0.25 sec delay */ |
| 824 | then = rawclock () + RAWHZ / 4; |
| 825 | while ((rawclock () - then) < 0) |
| 826 | continue; |
| 827 | |
| 828 | outb(port, com_cfcr, cfcr); |
| 829 | return 0; |
| 830 | } |
| 831 | |
| 832 | |
| 833 | static struct serial_ops dos_ops = |
| 834 | { |
| 835 | "hardwire", |
| 836 | 0, |
| 837 | dos_open, |
| 838 | dos_close, |
| 839 | dos_readchar, |
| 840 | dos_write, |
| 841 | dos_noop, /* flush output */ |
| 842 | dos_flush_input, |
| 843 | dos_sendbreak, |
| 844 | dos_raw, |
| 845 | dos_get_tty_state, |
| 846 | dos_set_tty_state, |
| 847 | dos_print_tty_state, |
| 848 | dos_noflush_set_tty_state, |
| 849 | dos_setbaudrate, |
| 850 | dos_setstopbits, |
| 851 | }; |
| 852 | |
| 853 | |
| 854 | static void |
| 855 | dos_info (arg, from_tty) |
| 856 | char *arg; |
| 857 | int from_tty; |
| 858 | { |
| 859 | struct dos_ttystate *port; |
| 860 | int i; |
| 861 | |
| 862 | for (port = ports; port < &ports[4]; port++) |
| 863 | { |
| 864 | if (port->baudrate == 0) |
| 865 | continue; |
| 866 | printf_filtered ("Port:\tCOM%d (%sactive)\n", port - ports + 1, |
| 867 | port->intrupt ? "" : "not "); |
| 868 | printf_filtered ("Addr:\t0x%03x (irq %d)\n", port->base, port->irq); |
| 869 | printf_filtered ("16550:\t%s\n", port->fifo ? "yes" : "no"); |
| 870 | printf_filtered ("Speed:\t%d baud\n", port->baudrate); |
| 871 | printf_filtered ("Errs:\tframing %d parity %d overflow %d\n\n", |
| 872 | port->ferr, port->perr, port->oflo); |
| 873 | } |
| 874 | |
| 875 | #ifdef DOS_STATS |
| 876 | printf_filtered ("\nTotal interrupts: %d\n", intrcnt); |
| 877 | for (i = 0; i < NCNT; i++) |
| 878 | if (cnts[i]) |
| 879 | printf_filtered ("%s:\t%d\n", cntnames[i], cnts[i]); |
| 880 | #endif |
| 881 | } |
| 882 | |
| 883 | |
| 884 | void |
| 885 | _initialize_ser_dos () |
| 886 | { |
| 887 | struct cmd_list_element *c; |
| 888 | |
| 889 | serial_add_interface (&dos_ops); |
| 890 | |
| 891 | /* Save original interrupt mask register. */ |
| 892 | icu_oldmask = inportb (ICU_MASK); |
| 893 | |
| 894 | /* Mark fixed motherboard irqs as inuse. */ |
| 895 | intrupts[0].inuse = /* timer tick */ |
| 896 | intrupts[1].inuse = /* keyboard */ |
| 897 | intrupts[2].inuse = 1; /* slave icu */ |
| 898 | |
| 899 | add_show_from_set ( |
| 900 | add_set_cmd ("com1base", class_obscure, var_zinteger, |
| 901 | (char *) &ports[0].base, |
| 902 | "Set COM1 base i/o port address.", |
| 903 | &setlist), |
| 904 | &showlist); |
| 905 | |
| 906 | add_show_from_set ( |
| 907 | add_set_cmd ("com1irq", class_obscure, var_zinteger, |
| 908 | (char *) &ports[0].irq, |
| 909 | "Set COM1 interrupt request.", |
| 910 | &setlist), |
| 911 | &showlist); |
| 912 | |
| 913 | add_show_from_set ( |
| 914 | add_set_cmd ("com2base", class_obscure, var_zinteger, |
| 915 | (char *) &ports[1].base, |
| 916 | "Set COM2 base i/o port address.", |
| 917 | &setlist), |
| 918 | &showlist); |
| 919 | |
| 920 | add_show_from_set ( |
| 921 | add_set_cmd ("com2irq", class_obscure, var_zinteger, |
| 922 | (char *) &ports[1].irq, |
| 923 | "Set COM2 interrupt request.", |
| 924 | &setlist), |
| 925 | &showlist); |
| 926 | |
| 927 | add_show_from_set ( |
| 928 | add_set_cmd ("com3base", class_obscure, var_zinteger, |
| 929 | (char *) &ports[2].base, |
| 930 | "Set COM3 base i/o port address.", |
| 931 | &setlist), |
| 932 | &showlist); |
| 933 | |
| 934 | add_show_from_set ( |
| 935 | add_set_cmd ("com3irq", class_obscure, var_zinteger, |
| 936 | (char *) &ports[2].irq, |
| 937 | "Set COM3 interrupt request.", |
| 938 | &setlist), |
| 939 | &showlist); |
| 940 | |
| 941 | add_show_from_set ( |
| 942 | add_set_cmd ("com4base", class_obscure, var_zinteger, |
| 943 | (char *) &ports[3].base, |
| 944 | "Set COM4 base i/o port address.", |
| 945 | &setlist), |
| 946 | &showlist); |
| 947 | |
| 948 | add_show_from_set ( |
| 949 | add_set_cmd ("com4irq", class_obscure, var_zinteger, |
| 950 | (char *) &ports[3].irq, |
| 951 | "Set COM4 interrupt request.", |
| 952 | &setlist), |
| 953 | &showlist); |
| 954 | |
| 955 | add_info ("serial", dos_info, |
| 956 | "Print DOS serial port status."); |
| 957 | } |