isa.c revision 1.28.2.9
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 1.28.2.9 1993/10/15 03:16:19 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 73 /* 74 * We think there might be an ISA bus here. Check it out. 75 */ 76 static int 77 isaprobe(parent, cf, aux) 78 struct device *parent; 79 struct cfdata *cf; 80 void *aux; 81 { 82 83 /* XXX should do a real probe */ 84 isa_bustype = BUS_ISA; 85 return 1; 86 } 87 88 /* 89 * Probe succeeded, someone called config_attach. Now we have to 90 * probe the ISA bus itself in our turn. 91 */ 92 static void 93 isaattach(parent, self, aux) 94 struct device *parent, *self; 95 void *aux; 96 { 97 98 /* XXX should print ISA/EISA & bus clock frequency and anything else 99 we can figure out? */ 100 printf("\n"); 101 102 isa_defaultirq(); 103 disable_intr(); 104 intr_enable(IRQ_SLAVE); 105 106 /* Iterate ``isasubmatch'' over all devices configured here. */ 107 (void)config_search(isasubmatch, self, (void *)NULL); 108 109 printf("biomask %x ttymask %x netmask %x impmask %x astmask %s\n", 110 biomask, ttymask, netmask, impmask, astmask); 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 routine. */ 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 /* Driver says it is there. Try to reserve ports and memory. */ 163 if (isa_reserveports(ia.ia_iobase, ia.ia_iosize)) { 164 if (isa_reservemem(ia.ia_maddr, ia.ia_msize)) 165 config_attach(isa, cf, &ia, isaprint); /* victory! */ 166 else 167 isa_unreserveports(ia.ia_iobase, ia.ia_iosize); 168 } 169 170 /* In any case, move on to next config entry. */ 171 return 0; 172 } 173 174 /* 175 * Called indirectly via config_attach (see above). Config has already 176 * printed, e.g., "wdc0 at isa0". We can ignore our ``isaname'' arg 177 * (it is always NULL, by definition) and just extend the line with 178 * the standard info (port(s), irq, drq, and iomem). 179 */ 180 static int 181 isaprint(aux, isaname) 182 void *aux; 183 char *isaname; 184 { 185 struct isa_attach_args *ia = aux; 186 187 if (ia->ia_iosize) 188 printf(" port 0x%x", ia->ia_iobase); 189 if (ia->ia_iosize > 1) 190 printf("-0x%x", ia->ia_iobase + ia->ia_iosize - 1); 191 #ifdef DIAGNOSTIC 192 if (ia->ia_irq == IRQUNK) 193 printf(" THIS IS A BUG ->"); 194 #endif 195 if (ia->ia_irq != IRQNONE) 196 printf(" irq %d", ffs(ia->ia_irq) - 1); 197 if (ia->ia_drq != DRQUNK) 198 printf(" drq %d", ia->ia_drq); 199 if (ia->ia_msize) 200 printf(" iomem 0x%x", ia->ia_maddr); 201 if (ia->ia_msize > 1) 202 printf("-0x%x", ia->ia_maddr + ia->ia_msize - 1); 203 /* XXXX print flags */ 204 return QUIET; /* actually, our return value is irrelevant. */ 205 } 206 207 208 #define IDTVEC(name) __CONCAT(X,name) 209 /* default interrupt vector table entries */ 210 extern *IDTVEC(intr)[NIRQ]; 211 /* out of range default interrupt vector gate entry */ 212 extern IDTVEC(stray); 213 214 /* 215 * Fill in default interrupt table, and mask all interrupts. 216 */ 217 static void 218 isa_defaultirq() 219 { 220 int i; 221 222 /* icu vectors */ 223 for (i = ICU_OFFSET; i < ICU_OFFSET + ICU_LEN ; i++) 224 setidt(i, IDTVEC(intr)[i], SDT_SYS386IGT, SEL_KPL); 225 226 /* out of range vectors */ 227 for (; i < NIDT; i++) 228 setidt(i, &IDTVEC(stray), SDT_SYS386IGT, SEL_KPL); 229 230 /* initialize 8259's */ 231 outb(IO_ICU1, 0x11); /* reset; program device, four bytes */ 232 outb(IO_ICU1+1, ICU_OFFSET); /* starting at this vector index */ 233 outb(IO_ICU1+1, IRQ_SLAVE); 234 #ifdef AUTO_EOI_1 235 outb(IO_ICU1+1, 2 | 1); /* auto EOI, 8086 mode */ 236 #else 237 outb(IO_ICU1+1, 1); /* 8086 mode */ 238 #endif 239 outb(IO_ICU1+1, 0xff); /* leave interrupts masked */ 240 outb(IO_ICU1, 0x0a); /* default to IRR on read */ 241 #ifdef REORDER_IRQ 242 outb(IO_ICU1, 0xc0 | (3 - 1)); /* pri order 3-7, 0-2 (com2 first) */ 243 #endif 244 245 outb(IO_ICU2, 0x11); /* reset; program device, four bytes */ 246 outb(IO_ICU2+1, ICU_OFFSET+8); /* staring at this vector index */ 247 outb(IO_ICU2+1, ffs(IRQ_SLAVE)-1); 248 #ifdef AUTO_EOI_2 249 outb(IO_ICU2+1, 2 | 1); /* auto EOI, 8086 mode */ 250 #else 251 outb(IO_ICU2+1, 1); /* 8086 mode */ 252 #endif 253 outb(IO_ICU2+1, 0xff); /* leave interrupts masked */ 254 outb(IO_ICU2, 0x0a); /* default to IRR on read */ 255 } 256 257 /* 258 * Flush any pending interrupts. 259 */ 260 static void 261 isa_flushintrs() 262 { 263 register int i; 264 265 /* clear any pending interrupts */ 266 for (i = 0; i < 8; i++) { 267 outb(IO_ICU1, ICU_EOI); 268 outb(IO_ICU2, ICU_EOI); 269 } 270 } 271 272 /* 273 * Determine what IRQ a device is using by trying to force it to generate an 274 * interrupt and seeing which IRQ line goes high. It is not safe to call 275 * this function after autoconfig. 276 */ 277 u_short 278 isa_discoverintr(force, aux) 279 void (*force)(); 280 { 281 int time = TIMER_FREQ * 1; /* wait up to 1 second */ 282 u_int last, now; 283 u_short iobase = IO_TIMER1; 284 285 isa_flushintrs(); 286 /* attempt to force interrupt */ 287 force(aux); 288 /* set timer 2 to a known state */ 289 outb(iobase + TIMER_MODE, TIMER_SEL2|TIMER_RATEGEN|TIMER_16BIT); 290 outb(iobase + TIMER_CNTR2, 0xff); 291 outb(iobase + TIMER_CNTR2, 0xff); 292 last = 0xffff; 293 while (time > 0) { 294 register u_char irr, lo, hi; 295 irr = inb(IO_ICU1); 296 if (irr) 297 return 1 << (ffs(irr) - 1); 298 irr = inb(IO_ICU2); 299 if (irr) 300 return 1 << (ffs(irr) + 7); 301 outb(iobase + TIMER_MODE, TIMER_SEL2|TIMER_LATCH); 302 lo = inb(iobase + TIMER_CNTR2); 303 hi = inb(iobase + TIMER_CNTR2); 304 now = (hi << 8) | lo; 305 if (now <= last) 306 time -= (last - now); 307 else 308 time -= 0xffff - (now - last); 309 last = now; 310 } 311 return IRQNONE; 312 } 313 314 /* 315 * Handle a NMI, possibly a machine check. 316 * return true to panic system, false to ignore. 317 * 318 * This implementation is hist[oe]rical. 319 */ 320 int 321 isa_nmi() 322 { 323 324 log(LOG_CRIT, "NMI port 61 %x, port 70 %x\n", inb(0x61), inb(0x70)); 325 return 0; 326 } 327 328 /* 329 * Caught a stray interrupt, notify 330 */ 331 void 332 isa_strayintr(d) 333 int d; 334 { 335 extern u_long intrcnt_stray; 336 337 /* 338 * Stray level 7 interrupts occur when someone raises an interrupt 339 * and then drops it before the CPU acknowledges it. This means 340 * either the device is screwed or something is cli'ing too long 341 * and it's timing out. 342 * 343 * -1 is passed by the generic handler for out of range exceptions, 344 * since we don't really want 208 little vectors. (It wouldn't be 345 * all that much code, but why bother?) 346 */ 347 if (intrcnt_stray++ < 5) 348 if (d == -1) 349 log(LOG_ERR, "wild interrupt\n"); 350 else 351 log(LOG_ERR, "stray interrupt %d\n", d); 352 if (intrcnt_stray == 5) 353 log(LOG_ERR, "too many stray interrupts; stopped logging\n"); 354 } 355 356 static int beeping; 357 358 static void 359 sysbeepstop(int f) 360 { 361 362 /* disable counter 2 */ 363 disable_intr(); 364 outb(PITAUX_PORT, inb(PITAUX_PORT) & ~PIT_SPKR); 365 enable_intr(); 366 if (f) 367 timeout((timeout_t)sysbeepstop, (caddr_t)0, f); 368 else 369 beeping = 0; 370 } 371 372 void 373 sysbeep(int pitch, int period) 374 { 375 static int last_pitch, last_period; 376 377 if (beeping) { 378 untimeout((timeout_t)sysbeepstop, (caddr_t)(last_period/2)); 379 untimeout((timeout_t)sysbeepstop, (caddr_t)0); 380 } 381 if (!beeping || last_pitch != pitch) { 382 /* 383 * XXX - move timer stuff to clock.c. 384 */ 385 disable_intr(); 386 outb(TIMER_MODE, TIMER_SEL2|TIMER_16BIT|TIMER_SQWAVE); 387 outb(TIMER_CNTR2, TIMER_DIV(pitch)); 388 outb(TIMER_CNTR2, TIMER_DIV(pitch)>>8); 389 outb(PITAUX_PORT, inb(PITAUX_PORT) | PIT_SPKR); /* enable counter 2 */ 390 enable_intr(); 391 } 392 last_pitch = pitch; 393 beeping = last_period = period; 394 timeout((timeout_t)sysbeepstop, (caddr_t)(period/2), period); 395 } 396
Indexes created Thu Oct 02 01:09:59 GMT 2025