isa.c revision 1.28.2.13
1 /*- 2 * Copyright (c) 1993 Charles Hannum. 3 * Copyright (c) 1991 The Regents of the University of California. 4 * All rights reserved. 5 * 6 * This code is derived from software contributed to Berkeley by 7 * William Jolitz. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed by the University of 20 * California, Berkeley and its contributors. 21 * 4. Neither the name of the University nor the names of its contributors 22 * may be used to endorse or promote products derived from this software 23 * without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 35 * SUCH DAMAGE. 36 * 37 * from: @(#)isa.c 7.2 (Berkeley) 5/13/91 38 * $Id: isa.c,v 1.28.2.13 1993/10/16 04:00:59 mycroft Exp $ 39 */ 40 41 /* 42 * code to manage AT bus 43 */ 44 45 #include "param.h" 46 #include "systm.h" 47 #include "conf.h" 48 #include "file.h" 49 #include "syslog.h" 50 #include "machine/cpu.h" 51 #include "machine/pio.h" 52 #include "sys/device.h" 53 #include "vm/vm.h" 54 #include "i386/isa/isa.h" 55 #include "i386/isa/isavar.h" 56 #include "i386/isa/icu.h" 57 #include "i386/isa/timerreg.h" 58 #include "i386/isa/spkr_reg.h" 59 60 isa_type isa_bustype; /* type of bus */ 61 62 static int isaprobe __P((struct device *, struct cfdata *, void *)); 63 static void isaattach __P((struct device *, struct device *, void *)); 64 static int isasubmatch __P((struct device *, struct cfdata *, void *)); 65 66 struct cfdriver isacd = 67 { NULL, "isa", isaprobe, isaattach, DV_DULL, sizeof(struct isa_softc) }; 68 69 static void isa_defaultirq __P((void)); 70 static int isaprint __P((void *, char *)); 71 static void isa_flushintrs __P((void)); 72 static void isa_intrmaskwickedness __P((void)); 73 74 /* 75 * We think there might be an ISA bus here. Check it out. 76 */ 77 static int 78 isaprobe(parent, cf, aux) 79 struct device *parent; 80 struct cfdata *cf; 81 void *aux; 82 { 83 84 /* XXX should do a real probe */ 85 isa_bustype = BUS_ISA; 86 return 1; 87 } 88 89 /* 90 * Probe succeeded, someone called config_attach. Now we have to 91 * probe the ISA bus itself in our turn. 92 */ 93 static void 94 isaattach(parent, self, aux) 95 struct device *parent, *self; 96 void *aux; 97 { 98 99 /* XXX should print ISA/EISA & bus clock frequency and anything else 100 we can figure out? */ 101 printf("\n"); 102 103 isa_defaultirq(); 104 disable_intr(); 105 intr_enable(IRQ_SLAVE); 106 107 /* Iterate ``isasubmatch'' over all devices configured here. */ 108 (void)config_search(isasubmatch, self, (void *)NULL); 109 110 isa_intrmaskwickedness(); 111 112 isa_flushintrs(); 113 enable_intr(); 114 splnone(); 115 } 116 117 /* 118 * isaattach (above) iterates this function over all the sub-devices that 119 * were configured at the ``isa'' device. Our job is to provide defaults 120 * and do some internal/external representation conversion (some of which 121 * is scheduled to get cleaned up later), then call the device's probe 122 * function. If this says the device is there, we try to reserve ISA 123 * bus memory and ports for the device, and attach it. 124 * 125 * Note that we always return 0, but our ultimate caller (isaattach) 126 * does not care that we never `match' anything. (In fact, our return 127 * value is entirely irrelevant; this function is run entirely for its 128 * side effects.) 129 */ 130 static int 131 isasubmatch(isa, cf, aux) 132 struct device *isa; 133 struct cfdata *cf; 134 void *aux; 135 { 136 struct isa_attach_args ia; 137 138 #ifdef DIAGNOSTIC 139 if (cf->cf_driver->cd_match == NULL) { 140 /* we really ought to add printf formats to panic(). */ 141 printf("isasubmatch: no match function for `%s' device\n", 142 cf->cf_driver->cd_name); 143 panic("isasubmatch: no match function\n"); 144 } 145 #endif 146 147 /* Init the info needed in the device probe and attach routines. */ 148 ia.ia_iobase = cf->cf_iobase; 149 ia.ia_iosize = cf->cf_iosize; 150 if (cf->cf_irq == -1) 151 ia.ia_irq = IRQUNK; 152 else 153 ia.ia_irq = 1 << cf->cf_irq; 154 ia.ia_drq = cf->cf_drq; 155 ia.ia_maddr = (caddr_t)cf->cf_maddr; 156 ia.ia_msize = cf->cf_msize; 157 158 /* If driver says it's not there, believe it. */ 159 if (!cf->cf_driver->cd_match(isa, cf, &ia)) 160 return 0; 161 162 /* Check for port or shared memory conflicts. */ 163 if (ia.ia_iosize && !isa_portcheck(ia.ia_iobase, ia.ia_iosize)) 164 return 0; 165 if (ia.ia_msize && !isa_memcheck(ia.ia_maddr, ia.ia_msize)) 166 return 0; 167 168 /* Reserve I/O ports and/or shared memory. */ 169 if (ia.ia_iosize) 170 isa_portalloc(ia.ia_iobase, ia.ia_iosize); 171 if (ia.ia_msize) 172 isa_memalloc(ia.ia_maddr, ia.ia_msize); 173 174 /* Configure device. */ 175 config_attach(isa, cf, &ia, isaprint); 176 177 return 0; 178 } 179 180 /* 181 * Called indirectly via config_attach (see above). Config has already 182 * printed, e.g., "wdc0 at isa0". We can ignore our ``isaname'' arg 183 * (it is always NULL, by definition) and just extend the line with 184 * the standard info (port(s), irq, drq, and iomem). 185 */ 186 static int 187 isaprint(aux, isaname) 188 void *aux; 189 char *isaname; 190 { 191 struct isa_attach_args *ia = aux; 192 193 if (ia->ia_iosize) 194 printf(" port 0x%x", ia->ia_iobase); 195 if (ia->ia_iosize > 1) 196 printf("-0x%x", ia->ia_iobase + ia->ia_iosize - 1); 197 if (ia->ia_msize) 198 printf(" iomem 0x%x", ia->ia_maddr); 199 if (ia->ia_msize > 1) 200 printf("-0x%x", ia->ia_maddr + ia->ia_msize - 1); 201 #ifdef DIAGNOSTIC 202 if (ia->ia_irq == IRQUNK) 203 printf(" THIS IS A BUG ->"); 204 #endif 205 if (ia->ia_irq != IRQNONE) 206 printf(" irq %d", ffs(ia->ia_irq) - 1); 207 if (ia->ia_drq != DRQUNK) 208 printf(" drq %d", ia->ia_drq); 209 /* XXXX print flags */ 210 return QUIET; /* actually, our return value is irrelevant. */ 211 } 212 213 /* 214 int isa_portcheck __P((u_int, u_int)); 215 int isa_memcheck __P((u_int, u_int)); 216 void isa_portalloc __P((u_int, u_int)); 217 void isa_memalloc __P((u_int, u_int)); 218 */ 219 220 int intrmask[NIRQ]; 221 struct intrhand *intrhand[NIRQ]; 222 223 /* 224 * Register an interrupt handler. 225 */ 226 void 227 intr_establish(intr, handler, class) 228 int intr; 229 struct intrhand *handler; 230 enum devclass class; 231 { 232 int irqnum = ffs(intr) - 1; 233 234 #ifdef DIAGNOSTIC 235 if (intr == IRQUNK || intr == IRQNONE || 236 (intr &~ (1 << irqnum)) != IRQNONE) 237 panic("intr_establish: weird irq"); 238 #endif 239 240 switch (class) { 241 case DV_DULL: 242 break; 243 case DV_DISK: 244 case DV_TAPE: 245 biomask |= intr; 246 break; 247 case DV_IFNET: 248 netmask |= intr; 249 break; 250 case DV_TTY: 251 ttymask |= intr; 252 break; 253 case DV_CPU: 254 default: 255 panic("intrhand: weird devclass"); 256 } 257 258 handler->ih_count = 0; 259 handler->ih_next = intrhand[irqnum]; 260 intrhand[irqnum] = handler; 261 262 intr_enable(intr); 263 } 264 265 /* 266 * Set up the masks for each interrupt handler based on the information 267 * recorded by intr_establish(). 268 */ 269 static void 270 isa_intrmaskwickedness() 271 { 272 int irq, mask; 273 274 for (irq = 0; irq < NIRQ; irq++) { 275 mask = (1 << irq) | astmask; 276 if (biomask & (1 << irq)) 277 mask |= biomask; 278 if (ttymask & (1 << irq)) 279 mask |= ttymask; 280 if (netmask & (1 << irq)) 281 mask |= netmask; 282 intrmask[irq] = mask; 283 } 284 285 impmask = netmask | ttymask; 286 printf("biomask %x ttymask %x netmask %x impmask %x astmask %s\n", 287 biomask, ttymask, netmask, impmask, astmask); 288 } 289 290 #define IDTVEC(name) __CONCAT(X,name) 291 /* default interrupt vector table entries */ 292 extern *IDTVEC(intr)[NIRQ]; 293 /* out of range default interrupt vector gate entry */ 294 extern IDTVEC(stray); 295 296 /* 297 * Fill in default interrupt table, and mask all interrupts. 298 */ 299 static void 300 isa_defaultirq() 301 { 302 int i; 303 304 /* icu vectors */ 305 for (i = ICU_OFFSET; i < ICU_OFFSET + ICU_LEN ; i++) 306 setidt(i, IDTVEC(intr)[i], SDT_SYS386IGT, SEL_KPL); 307 308 /* out of range vectors */ 309 for (; i < NIDT; i++) 310 setidt(i, &IDTVEC(stray), SDT_SYS386IGT, SEL_KPL); 311 312 /* initialize 8259's */ 313 outb(IO_ICU1, 0x11); /* reset; program device, four bytes */ 314 outb(IO_ICU1+1, ICU_OFFSET); /* starting at this vector index */ 315 outb(IO_ICU1+1, IRQ_SLAVE); 316 #ifdef AUTO_EOI_1 317 outb(IO_ICU1+1, 2 | 1); /* auto EOI, 8086 mode */ 318 #else 319 outb(IO_ICU1+1, 1); /* 8086 mode */ 320 #endif 321 outb(IO_ICU1+1, 0xff); /* leave interrupts masked */ 322 outb(IO_ICU1, 0x0a); /* default to IRR on read */ 323 #ifdef REORDER_IRQ 324 outb(IO_ICU1, 0xc0 | (3 - 1)); /* pri order 3-7, 0-2 (com2 first) */ 325 #endif 326 327 outb(IO_ICU2, 0x11); /* reset; program device, four bytes */ 328 outb(IO_ICU2+1, ICU_OFFSET+8); /* staring at this vector index */ 329 outb(IO_ICU2+1, ffs(IRQ_SLAVE)-1); 330 #ifdef AUTO_EOI_2 331 outb(IO_ICU2+1, 2 | 1); /* auto EOI, 8086 mode */ 332 #else 333 outb(IO_ICU2+1, 1); /* 8086 mode */ 334 #endif 335 outb(IO_ICU2+1, 0xff); /* leave interrupts masked */ 336 outb(IO_ICU2, 0x0a); /* default to IRR on read */ 337 } 338 339 /* 340 * Flush any pending interrupts. 341 */ 342 static void 343 isa_flushintrs() 344 { 345 register int i; 346 347 /* clear any pending interrupts */ 348 for (i = 0; i < 8; i++) { 349 outb(IO_ICU1, ICU_EOI); 350 outb(IO_ICU2, ICU_EOI); 351 } 352 } 353 354 /* 355 * Determine what IRQ a device is using by trying to force it to generate an 356 * interrupt and seeing which IRQ line goes high. It is not safe to call 357 * this function after autoconfig. 358 */ 359 u_short 360 isa_discoverintr(force, aux) 361 void (*force)(); 362 { 363 int time = TIMER_FREQ * 1; /* wait up to 1 second */ 364 u_int last, now; 365 u_short iobase = IO_TIMER1; 366 367 isa_flushintrs(); 368 /* attempt to force interrupt */ 369 force(aux); 370 /* set timer 2 to a known state */ 371 outb(iobase + TIMER_MODE, TIMER_SEL2|TIMER_RATEGEN|TIMER_16BIT); 372 outb(iobase + TIMER_CNTR2, 0xff); 373 outb(iobase + TIMER_CNTR2, 0xff); 374 last = 0xffff; 375 while (time > 0) { 376 register u_char irr, lo, hi; 377 irr = inb(IO_ICU1) & ~IRQ_SLAVE; 378 if (irr) 379 return 1 << (ffs(irr) - 1); 380 irr = inb(IO_ICU2); 381 if (irr) 382 return 1 << (ffs(irr) + 7); 383 outb(iobase + TIMER_MODE, TIMER_SEL2|TIMER_LATCH); 384 lo = inb(iobase + TIMER_CNTR2); 385 hi = inb(iobase + TIMER_CNTR2); 386 now = (hi << 8) | lo; 387 if (now <= last) 388 time -= (last - now); 389 else 390 time -= 0x10000 - (now - last); 391 last = now; 392 } 393 return IRQNONE; 394 } 395 396 /* 397 * Handle a NMI, possibly a machine check. 398 * return true to panic system, false to ignore. 399 * 400 * This implementation is hist[oe]rical. 401 */ 402 int 403 isa_nmi() 404 { 405 406 log(LOG_CRIT, "NMI port 61 %x, port 70 %x\n", inb(0x61), inb(0x70)); 407 return 0; 408 } 409 410 /* 411 * Caught a stray interrupt, notify 412 */ 413 void 414 isa_strayintr(d) 415 int d; 416 { 417 extern u_long intrcnt_stray; 418 419 /* 420 * Stray level 7 interrupts occur when someone raises an interrupt 421 * and then drops it before the CPU acknowledges it. This means 422 * either the device is screwed or something is cli'ing too long 423 * and it's timing out. 424 * 425 * -1 is passed by the generic handler for out of range exceptions, 426 * since we don't really want 208 little vectors. (It wouldn't be 427 * all that much code, but why bother?) 428 */ 429 if (intrcnt_stray++ < 5) 430 if (d == -1) 431 log(LOG_ERR, "wild interrupt\n"); 432 else 433 log(LOG_ERR, "stray interrupt %d\n", d); 434 if (intrcnt_stray == 5) 435 log(LOG_ERR, "too many stray interrupts; stopped logging\n"); 436 } 437 438 static int beeping; 439 440 static void 441 sysbeepstop(int f) 442 { 443 444 /* disable counter 2 */ 445 disable_intr(); 446 outb(PITAUX_PORT, inb(PITAUX_PORT) & ~PIT_SPKR); 447 enable_intr(); 448 if (f) 449 timeout((timeout_t)sysbeepstop, (caddr_t)0, f); 450 else 451 beeping = 0; 452 } 453 454 void 455 sysbeep(int pitch, int period) 456 { 457 static int last_pitch, last_period; 458 459 if (beeping) { 460 untimeout((timeout_t)sysbeepstop, (caddr_t)(last_period/2)); 461 untimeout((timeout_t)sysbeepstop, (caddr_t)0); 462 } 463 if (!beeping || last_pitch != pitch) { 464 /* 465 * XXX - move timer stuff to clock.c. 466 */ 467 disable_intr(); 468 outb(TIMER_MODE, TIMER_SEL2|TIMER_16BIT|TIMER_SQWAVE); 469 outb(TIMER_CNTR2, TIMER_DIV(pitch)); 470 outb(TIMER_CNTR2, TIMER_DIV(pitch)>>8); 471 outb(PITAUX_PORT, inb(PITAUX_PORT) | PIT_SPKR); /* enable counter 2 */ 472 enable_intr(); 473 } 474 last_pitch = pitch; 475 beeping = last_period = period; 476 timeout((timeout_t)sysbeepstop, (caddr_t)(period/2), period); 477 } 478
Indexes created Thu Oct 02 01:09:59 GMT 2025