isa.c revision 24236
1/*- 2 * Copyright (c) 1991 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * William Jolitz. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * from: @(#)isa.c 7.2 (Berkeley) 5/13/91 37 * $Id: isa.c,v 1.77 1997/02/22 09:36:40 peter Exp $ 38 */ 39 40/* 41 * code to manage AT bus 42 * 43 * 92/08/18 Frank P. MacLachlan (fpm@crash.cts.com): 44 * Fixed uninitialized variable problem and added code to deal 45 * with DMA page boundaries in isa_dmarangecheck(). Fixed word 46 * mode DMA count compution and reorganized DMA setup code in 47 * isa_dmastart() 48 */ 49 50#include "opt_auto_eoi.h" 51 52#include <sys/param.h> 53#include <sys/systm.h> 54#include <sys/buf.h> 55#include <sys/syslog.h> 56#include <sys/malloc.h> 57#include <machine/md_var.h> 58#include <machine/segments.h> 59#include <vm/vm.h> 60#include <vm/vm_param.h> 61#include <vm/pmap.h> 62#include <i386/isa/isa_device.h> 63#include <i386/isa/isa.h> 64#include <i386/isa/icu.h> 65#include <i386/isa/ic/i8237.h> 66#include "vector.h" 67 68/* 69** Register definitions for DMA controller 1 (channels 0..3): 70*/ 71#define DMA1_CHN(c) (IO_DMA1 + 1*(2*(c))) /* addr reg for channel c */ 72#define DMA1_SMSK (IO_DMA1 + 1*10) /* single mask register */ 73#define DMA1_MODE (IO_DMA1 + 1*11) /* mode register */ 74#define DMA1_FFC (IO_DMA1 + 1*12) /* clear first/last FF */ 75 76/* 77** Register definitions for DMA controller 2 (channels 4..7): 78*/ 79#define DMA2_CHN(c) (IO_DMA2 + 2*(2*(c))) /* addr reg for channel c */ 80#define DMA2_SMSK (IO_DMA2 + 2*10) /* single mask register */ 81#define DMA2_MODE (IO_DMA2 + 2*11) /* mode register */ 82#define DMA2_FFC (IO_DMA2 + 2*12) /* clear first/last FF */ 83 84u_long *intr_countp[ICU_LEN]; 85inthand2_t *intr_handler[ICU_LEN]; 86u_int intr_mask[ICU_LEN]; 87u_int* intr_mptr[ICU_LEN]; 88int intr_unit[ICU_LEN]; 89 90static inthand_t *fastintr[ICU_LEN] = { 91 &IDTVEC(fastintr0), &IDTVEC(fastintr1), 92 &IDTVEC(fastintr2), &IDTVEC(fastintr3), 93 &IDTVEC(fastintr4), &IDTVEC(fastintr5), 94 &IDTVEC(fastintr6), &IDTVEC(fastintr7), 95 &IDTVEC(fastintr8), &IDTVEC(fastintr9), 96 &IDTVEC(fastintr10), &IDTVEC(fastintr11), 97 &IDTVEC(fastintr12), &IDTVEC(fastintr13), 98 &IDTVEC(fastintr14), &IDTVEC(fastintr15) 99}; 100 101static inthand_t *slowintr[ICU_LEN] = { 102 &IDTVEC(intr0), &IDTVEC(intr1), &IDTVEC(intr2), &IDTVEC(intr3), 103 &IDTVEC(intr4), &IDTVEC(intr5), &IDTVEC(intr6), &IDTVEC(intr7), 104 &IDTVEC(intr8), &IDTVEC(intr9), &IDTVEC(intr10), &IDTVEC(intr11), 105 &IDTVEC(intr12), &IDTVEC(intr13), &IDTVEC(intr14), &IDTVEC(intr15) 106}; 107 108static void config_isadev __P((struct isa_device *isdp, u_int *mp)); 109static void config_isadev_c __P((struct isa_device *isdp, u_int *mp, 110 int reconfig)); 111static void conflict __P((struct isa_device *dvp, struct isa_device *tmpdvp, 112 int item, char const *whatnot, char const *reason, 113 char const *format)); 114static int haveseen __P((struct isa_device *dvp, struct isa_device *tmpdvp, 115 u_int checkbits)); 116static int isa_dmarangecheck __P((caddr_t va, u_int length, int chan)); 117static inthand2_t isa_strayintr; 118static void register_imask __P((struct isa_device *dvp, u_int mask)); 119 120/* 121 * print a conflict message 122 */ 123static void 124conflict(dvp, tmpdvp, item, whatnot, reason, format) 125 struct isa_device *dvp; 126 struct isa_device *tmpdvp; 127 int item; 128 char const *whatnot; 129 char const *reason; 130 char const *format; 131{ 132 printf("%s%d not %sed due to %s conflict with %s%d at ", 133 dvp->id_driver->name, dvp->id_unit, whatnot, reason, 134 tmpdvp->id_driver->name, tmpdvp->id_unit); 135 printf(format, item); 136 printf("\n"); 137} 138 139/* 140 * Check to see if things are already in use, like IRQ's, I/O addresses 141 * and Memory addresses. 142 */ 143static int 144haveseen(dvp, tmpdvp, checkbits) 145 struct isa_device *dvp; 146 struct isa_device *tmpdvp; 147 u_int checkbits; 148{ 149 /* 150 * Only check against devices that have already been found and are not 151 * unilaterally allowed to conflict anyway. 152 */ 153 if (tmpdvp->id_alive && !dvp->id_conflicts) { 154 char const *whatnot; 155 156 whatnot = checkbits & CC_ATTACH ? "attach" : "prob"; 157 /* 158 * Check for I/O address conflict. We can only check the 159 * starting address of the device against the range of the 160 * device that has already been probed since we do not 161 * know how many I/O addresses this device uses. 162 */ 163 if (checkbits & CC_IOADDR && tmpdvp->id_alive != -1) { 164 if ((dvp->id_iobase >= tmpdvp->id_iobase) && 165 (dvp->id_iobase <= 166 (tmpdvp->id_iobase + tmpdvp->id_alive - 1))) { 167 conflict(dvp, tmpdvp, dvp->id_iobase, whatnot, 168 "I/O address", "0x%x"); 169 return 1; 170 } 171 } 172 /* 173 * Check for Memory address conflict. We can check for 174 * range overlap, but it will not catch all cases since the 175 * driver may adjust the msize paramater during probe, for 176 * now we just check that the starting address does not 177 * fall within any allocated region. 178 * XXX could add a second check after the probe for overlap, 179 * since at that time we would know the full range. 180 * XXX KERNBASE is a hack, we should have vaddr in the table! 181 */ 182 if (checkbits & CC_MEMADDR && tmpdvp->id_maddr) { 183 if ((KERNBASE + dvp->id_maddr >= tmpdvp->id_maddr) && 184 (KERNBASE + dvp->id_maddr <= 185 (tmpdvp->id_maddr + tmpdvp->id_msize - 1))) { 186 conflict(dvp, tmpdvp, (int)dvp->id_maddr, 187 whatnot, "maddr", "0x%x"); 188 return 1; 189 } 190 } 191 /* 192 * Check for IRQ conflicts. 193 */ 194 if (checkbits & CC_IRQ && tmpdvp->id_irq) { 195 if (tmpdvp->id_irq == dvp->id_irq) { 196 conflict(dvp, tmpdvp, ffs(dvp->id_irq) - 1, 197 whatnot, "irq", "%d"); 198 return 1; 199 } 200 } 201 /* 202 * Check for DRQ conflicts. 203 */ 204 if (checkbits & CC_DRQ && tmpdvp->id_drq != -1) { 205 if (tmpdvp->id_drq == dvp->id_drq) { 206 conflict(dvp, tmpdvp, dvp->id_drq, whatnot, 207 "drq", "%d"); 208 return 1; 209 } 210 } 211 } 212 return 0; 213} 214 215/* 216 * Search through all the isa_devtab_* tables looking for anything that 217 * conflicts with the current device. 218 */ 219int 220haveseen_isadev(dvp, checkbits) 221 struct isa_device *dvp; 222 u_int checkbits; 223{ 224 struct isa_device *tmpdvp; 225 int status = 0; 226 227 for (tmpdvp = isa_devtab_tty; tmpdvp->id_driver; tmpdvp++) { 228 status |= haveseen(dvp, tmpdvp, checkbits); 229 if (status) 230 return status; 231 } 232 for (tmpdvp = isa_devtab_bio; tmpdvp->id_driver; tmpdvp++) { 233 status |= haveseen(dvp, tmpdvp, checkbits); 234 if (status) 235 return status; 236 } 237 for (tmpdvp = isa_devtab_net; tmpdvp->id_driver; tmpdvp++) { 238 status |= haveseen(dvp, tmpdvp, checkbits); 239 if (status) 240 return status; 241 } 242 for (tmpdvp = isa_devtab_null; tmpdvp->id_driver; tmpdvp++) { 243 status |= haveseen(dvp, tmpdvp, checkbits); 244 if (status) 245 return status; 246 } 247 return(status); 248} 249 250/* 251 * Configure all ISA devices 252 */ 253void 254isa_configure() { 255 struct isa_device *dvp; 256 257 splhigh(); 258 printf("Probing for devices on the ISA bus:\n"); 259 /* First probe all the sensitive probes */ 260 for (dvp = isa_devtab_tty; dvp->id_driver; dvp++) 261 if (dvp->id_driver->sensitive_hw) 262 config_isadev(dvp, &tty_imask); 263 for (dvp = isa_devtab_bio; dvp->id_driver; dvp++) 264 if (dvp->id_driver->sensitive_hw) 265 config_isadev(dvp, &bio_imask); 266 for (dvp = isa_devtab_net; dvp->id_driver; dvp++) 267 if (dvp->id_driver->sensitive_hw) 268 config_isadev(dvp, &net_imask); 269 for (dvp = isa_devtab_null; dvp->id_driver; dvp++) 270 if (dvp->id_driver->sensitive_hw) 271 config_isadev(dvp, (u_int *)NULL); 272 273 /* Then all the bad ones */ 274 for (dvp = isa_devtab_tty; dvp->id_driver; dvp++) 275 if (!dvp->id_driver->sensitive_hw) 276 config_isadev(dvp, &tty_imask); 277 for (dvp = isa_devtab_bio; dvp->id_driver; dvp++) 278 if (!dvp->id_driver->sensitive_hw) 279 config_isadev(dvp, &bio_imask); 280 for (dvp = isa_devtab_net; dvp->id_driver; dvp++) 281 if (!dvp->id_driver->sensitive_hw) 282 config_isadev(dvp, &net_imask); 283 for (dvp = isa_devtab_null; dvp->id_driver; dvp++) 284 if (!dvp->id_driver->sensitive_hw) 285 config_isadev(dvp, (u_int *)NULL); 286 287 bio_imask |= SWI_CLOCK_MASK; 288 net_imask |= SWI_NET_MASK; 289 tty_imask |= SWI_TTY_MASK; 290 291/* 292 * XXX we should really add the tty device to net_imask when the line is 293 * switched to SLIPDISC, and then remove it when it is switched away from 294 * SLIPDISC. No need to block out ALL ttys during a splimp when only one 295 * of them is running slip. 296 * 297 * XXX actually, blocking all ttys during a splimp doesn't matter so much 298 * with sio because the serial interrupt layer doesn't use tty_imask. Only 299 * non-serial ttys suffer. It's more stupid that ALL 'net's are blocked 300 * during spltty. 301 */ 302#include "sl.h" 303#if NSL > 0 304 net_imask |= tty_imask; 305 tty_imask = net_imask; 306#endif 307 308 /* bio_imask |= tty_imask ; can some tty devices use buffers? */ 309 310 if (bootverbose) 311 printf("imasks: bio %x, tty %x, net %x\n", 312 bio_imask, tty_imask, net_imask); 313 314 /* 315 * Finish initializing intr_mask[]. Note that the partly 316 * constructed masks aren't actually used since we're at splhigh. 317 * For fully dynamic initialization, register_intr() and 318 * unregister_intr() will have to adjust the masks for _all_ 319 * interrupts and for tty_imask, etc. 320 */ 321 for (dvp = isa_devtab_tty; dvp->id_driver; dvp++) 322 register_imask(dvp, tty_imask); 323 for (dvp = isa_devtab_bio; dvp->id_driver; dvp++) 324 register_imask(dvp, bio_imask); 325 for (dvp = isa_devtab_net; dvp->id_driver; dvp++) 326 register_imask(dvp, net_imask); 327 for (dvp = isa_devtab_null; dvp->id_driver; dvp++) 328 register_imask(dvp, SWI_CLOCK_MASK); 329 spl0(); 330} 331 332/* 333 * Configure an ISA device. 334 */ 335 336 337static void 338config_isadev(isdp, mp) 339 struct isa_device *isdp; 340 u_int *mp; 341{ 342 config_isadev_c(isdp, mp, 0); 343} 344 345void 346reconfig_isadev(isdp, mp) 347 struct isa_device *isdp; 348 u_int *mp; 349{ 350 config_isadev_c(isdp, mp, 1); 351} 352 353static void 354config_isadev_c(isdp, mp, reconfig) 355 struct isa_device *isdp; 356 u_int *mp; 357 int reconfig; 358{ 359 u_int checkbits; 360 int id_alive; 361 int last_alive; 362 struct isa_driver *dp = isdp->id_driver; 363 364 if (!isdp->id_enabled) { 365 printf("%s%d: disabled, not probed.\n", 366 dp->name, isdp->id_unit); 367 return; 368 } 369 checkbits = CC_DRQ | CC_IOADDR | CC_MEMADDR; 370 if (!reconfig && haveseen_isadev(isdp, checkbits)) 371 return; 372 if (!reconfig && isdp->id_maddr) { 373 isdp->id_maddr -= ISA_HOLE_START; 374 isdp->id_maddr += atdevbase; 375 } 376 if (reconfig) { 377 last_alive = isdp->id_alive; 378 isdp->id_reconfig = 1; 379 } 380 else { 381 last_alive = 0; 382 isdp->id_reconfig = 0; 383 } 384 id_alive = (*dp->probe)(isdp); 385 if (id_alive) { 386 /* 387 * Only print the I/O address range if id_alive != -1 388 * Right now this is a temporary fix just for the new 389 * NPX code so that if it finds a 486 that can use trap 390 * 16 it will not report I/O addresses. 391 * Rod Grimes 04/26/94 392 */ 393 if (!isdp->id_reconfig) { 394 printf("%s%d", dp->name, isdp->id_unit); 395 if (id_alive != -1) { 396 if (isdp->id_iobase == -1) 397 printf(" at <not configured>"); 398 else if (isdp->id_iobase != -2) { 399 printf(" at 0x%x", isdp->id_iobase); 400 if (isdp->id_iobase + id_alive - 1 != 401 isdp->id_iobase) { 402 printf("-0x%x", 403 isdp->id_iobase + id_alive - 1); 404 } 405 } 406 } 407 if (isdp->id_irq) 408 printf(" irq %d", ffs(isdp->id_irq) - 1); 409 if (isdp->id_drq != -1) 410 printf(" drq %d", isdp->id_drq); 411 if (isdp->id_maddr) 412 printf(" maddr 0x%lx", kvtop(isdp->id_maddr)); 413 if (isdp->id_msize) 414 printf(" msize %d", isdp->id_msize); 415 if (isdp->id_flags) 416 printf(" flags 0x%x", isdp->id_flags); 417 if (isdp->id_iobase && !(isdp->id_iobase & 0xf300)) { 418 printf(" on motherboard"); 419 } else if (isdp->id_iobase >= 0x1000 && 420 !(isdp->id_iobase & 0x300)) { 421 printf (" on eisa slot %d", 422 isdp->id_iobase >> 12); 423 } else { 424 printf (" on isa"); 425 } 426 printf("\n"); 427 /* 428 * Check for conflicts again. The driver may have 429 * changed *dvp. We should weaken the early check 430 * since the driver may have been able to change 431 * *dvp to avoid conflicts if given a chance. We 432 * already skip the early check for IRQs and force 433 * a check for IRQs in the next group of checks. 434 */ 435 checkbits |= CC_IRQ; 436 if (haveseen_isadev(isdp, checkbits)) 437 return; 438 isdp->id_alive = id_alive; 439 } 440 (*dp->attach)(isdp); 441 if (isdp->id_irq) { 442 if (mp) 443 INTRMASK(*mp, isdp->id_irq); 444 register_intr(ffs(isdp->id_irq) - 1, isdp->id_id, 445 isdp->id_ri_flags, isdp->id_intr, 446 mp, isdp->id_unit); 447 INTREN(isdp->id_irq); 448 } 449 } else { 450 if (isdp->id_reconfig) { 451 (*dp->attach)(isdp); /* reconfiguration attach */ 452 } 453 if (!last_alive) { 454 if (!isdp->id_reconfig) { 455 printf("%s%d not found", 456 dp->name, isdp->id_unit); 457 if (isdp->id_iobase == -1) 458 printf(" at <not configured>"); 459 else if (isdp->id_iobase != -2) 460 printf(" at 0x%x", isdp->id_iobase); 461 printf("\n"); 462 } 463 } 464 else { 465 /* This code has not been tested.... */ 466 if (isdp->id_irq) { 467 INTRDIS(isdp->id_irq); 468 unregister_intr(ffs(isdp->id_irq) - 1, 469 isdp->id_intr); 470 if (mp) 471 INTRUNMASK(*mp, isdp->id_irq); 472 } 473 } 474 } 475} 476 477/* 478 * Fill in default interrupt table (in case of spuruious interrupt 479 * during configuration of kernel, setup interrupt control unit 480 */ 481void 482isa_defaultirq() 483{ 484 int i; 485 486 /* icu vectors */ 487 for (i = 0; i < ICU_LEN; i++) 488 unregister_intr(i, (inthand2_t *)NULL); 489 490 /* initialize 8259's */ 491 outb(IO_ICU1, 0x11); /* reset; program device, four bytes */ 492 outb(IO_ICU1+1, NRSVIDT); /* starting at this vector index */ 493 outb(IO_ICU1+1, 1<<2); /* slave on line 2 */ 494#ifdef AUTO_EOI_1 495 outb(IO_ICU1+1, 2 | 1); /* auto EOI, 8086 mode */ 496#else 497 outb(IO_ICU1+1, 1); /* 8086 mode */ 498#endif 499 outb(IO_ICU1+1, 0xff); /* leave interrupts masked */ 500 outb(IO_ICU1, 0x0a); /* default to IRR on read */ 501 outb(IO_ICU1, 0xc0 | (3 - 1)); /* pri order 3-7, 0-2 (com2 first) */ 502 503 outb(IO_ICU2, 0x11); /* reset; program device, four bytes */ 504 outb(IO_ICU2+1, NRSVIDT+8); /* staring at this vector index */ 505 outb(IO_ICU2+1,2); /* my slave id is 2 */ 506#ifdef AUTO_EOI_2 507 outb(IO_ICU2+1, 2 | 1); /* auto EOI, 8086 mode */ 508#else 509 outb(IO_ICU2+1,1); /* 8086 mode */ 510#endif 511 outb(IO_ICU2+1, 0xff); /* leave interrupts masked */ 512 outb(IO_ICU2, 0x0a); /* default to IRR on read */ 513} 514 515static caddr_t dma_bouncebuf[8]; 516static u_int dma_bouncebufsize[8]; 517static u_int8_t dma_bounced = 0; 518static u_int8_t dma_busy = 0; /* Used in isa_dmastart() */ 519static u_int8_t dma_inuse = 0; /* User for acquire/release */ 520 521#define VALID_DMA_MASK (7) 522 523/* high byte of address is stored in this port for i-th dma channel */ 524static int dmapageport[8] = { 0x87, 0x83, 0x81, 0x82, 0x8f, 0x8b, 0x89, 0x8a }; 525 526/* 527 * Setup a DMA channel's bounce buffer. 528 */ 529void 530isa_dmainit(chan, bouncebufsize) 531 int chan; 532 u_int bouncebufsize; 533{ 534 void *buf; 535 536#ifdef DIAGNOSTIC 537 if (chan & ~VALID_DMA_MASK) 538 panic("isa_dmainit: channel out of range"); 539 540 if (dma_bouncebuf[chan] != NULL) 541 panic("isa_dmainit: impossible request"); 542#endif 543 544 dma_bouncebufsize[chan] = bouncebufsize; 545 546 /* Try malloc() first. It works better if it works. */ 547 buf = malloc(bouncebufsize, M_DEVBUF, M_NOWAIT); 548 if (buf != NULL) { 549 if (isa_dmarangecheck(buf, bouncebufsize, chan) == 0) { 550 dma_bouncebuf[chan] = buf; 551 return; 552 } 553 free(buf, M_DEVBUF); 554 } 555 buf = contigmalloc(bouncebufsize, M_DEVBUF, M_NOWAIT, 0ul, 0xfffffful, 556 1ul, chan & 4 ? 0x20000ul : 0x10000ul); 557 if (buf == NULL) 558 printf("isa_dmainit(%d, %d) failed\n", chan, bouncebufsize); 559 else 560 dma_bouncebuf[chan] = buf; 561} 562 563/* 564 * Register a DMA channel's usage. Usually called from a device driver 565 * in open() or during it's initialization. 566 */ 567int 568isa_dma_acquire(chan) 569 int chan; 570{ 571#ifdef DIAGNOSTIC 572 if (chan & ~VALID_DMA_MASK) 573 panic("isa_dma_acquire: channel out of range"); 574#endif 575 576 if (dma_inuse & (1 << chan)) { 577 printf("isa_dma_acquire: channel %d already in use\n", chan); 578 return (EBUSY); 579 } 580 dma_inuse |= (1 << chan); 581 582 return (0); 583} 584 585/* 586 * Unregister a DMA channel's usage. Usually called from a device driver 587 * during close() or during it's shutdown. 588 */ 589void 590isa_dma_release(chan) 591 int chan; 592{ 593#ifdef DIAGNOSTIC 594 if (chan & ~VALID_DMA_MASK) 595 panic("isa_dma_release: channel out of range"); 596 597 if (dma_inuse & (1 << chan) == 0) 598 printf("isa_dma_release: channel %d not in use\n", chan); 599#endif 600 601 if (dma_busy & (1 << chan)) { 602 dma_busy &= ~(1 << chan); 603 /* 604 * XXX We should also do "dma_bounced &= (1 << chan);" 605 * because we are acting on behalf of isa_dmadone() which 606 * was not called to end the last DMA operation. This does 607 * not matter now, but it may in the future. 608 */ 609 } 610 611 dma_inuse &= ~(1 << chan); 612} 613 614/* 615 * isa_dmacascade(): program 8237 DMA controller channel to accept 616 * external dma control by a board. 617 */ 618void isa_dmacascade(chan) 619 int chan; 620{ 621#ifdef DIAGNOSTIC 622 if (chan & ~VALID_DMA_MASK) 623 panic("isa_dmacascade: channel out of range"); 624#endif 625 626 /* set dma channel mode, and set dma channel mode */ 627 if ((chan & 4) == 0) { 628 outb(DMA1_MODE, DMA37MD_CASCADE | chan); 629 outb(DMA1_SMSK, chan); 630 } else { 631 outb(DMA2_MODE, DMA37MD_CASCADE | (chan & 3)); 632 outb(DMA2_SMSK, chan & 3); 633 } 634} 635 636/* 637 * isa_dmastart(): program 8237 DMA controller channel, avoid page alignment 638 * problems by using a bounce buffer. 639 */ 640void isa_dmastart(int flags, caddr_t addr, u_int nbytes, int chan) 641{ 642 vm_offset_t phys; 643 int waport; 644 caddr_t newaddr; 645 646#ifdef DIAGNOSTIC 647 if (chan & ~VALID_DMA_MASK) 648 panic("isa_dmastart: channel out of range"); 649 650 if ((chan < 4 && nbytes > (1<<16)) 651 || (chan >= 4 && (nbytes > (1<<17) || (u_int)addr & 1))) 652 panic("isa_dmastart: impossible request"); 653 654 if (dma_inuse & (1 << chan) == 0) 655 printf("isa_dmastart: channel %d not acquired\n", chan); 656#endif 657 658 if (dma_busy & (1 << chan)) 659 printf("isa_dmastart: channel %d busy\n", chan); 660 661 dma_busy |= (1 << chan); 662 663 if (isa_dmarangecheck(addr, nbytes, chan)) { 664 if (dma_bouncebuf[chan] == NULL 665 || dma_bouncebufsize[chan] < nbytes) 666 panic("isa_dmastart: bad bounce buffer"); 667 dma_bounced |= (1 << chan); 668 newaddr = dma_bouncebuf[chan]; 669 670 /* copy bounce buffer on write */ 671 if (!(flags & B_READ)) 672 bcopy(addr, newaddr, nbytes); 673 addr = newaddr; 674 } 675 676 /* translate to physical */ 677 phys = pmap_extract(pmap_kernel(), (vm_offset_t)addr); 678 679 if ((chan & 4) == 0) { 680 /* 681 * Program one of DMA channels 0..3. These are 682 * byte mode channels. 683 */ 684 /* set dma channel mode, and reset address ff */ 685 686 /* If B_RAW flag is set, then use autoinitialise mode */ 687 if (flags & B_RAW) { 688 if (flags & B_READ) 689 outb(DMA1_MODE, DMA37MD_AUTO|DMA37MD_WRITE|chan); 690 else 691 outb(DMA1_MODE, DMA37MD_AUTO|DMA37MD_READ|chan); 692 } 693 else 694 if (flags & B_READ) 695 outb(DMA1_MODE, DMA37MD_SINGLE|DMA37MD_WRITE|chan); 696 else 697 outb(DMA1_MODE, DMA37MD_SINGLE|DMA37MD_READ|chan); 698 outb(DMA1_FFC, 0); 699 700 /* send start address */ 701 waport = DMA1_CHN(chan); 702 outb(waport, phys); 703 outb(waport, phys>>8); 704 outb(dmapageport[chan], phys>>16); 705 706 /* send count */ 707 outb(waport + 1, --nbytes); 708 outb(waport + 1, nbytes>>8); 709 710 /* unmask channel */ 711 outb(DMA1_SMSK, chan); 712 } else { 713 /* 714 * Program one of DMA channels 4..7. These are 715 * word mode channels. 716 */ 717 /* set dma channel mode, and reset address ff */ 718 719 /* If B_RAW flag is set, then use autoinitialise mode */ 720 if (flags & B_RAW) { 721 if (flags & B_READ) 722 outb(DMA2_MODE, DMA37MD_AUTO|DMA37MD_WRITE|(chan&3)); 723 else 724 outb(DMA2_MODE, DMA37MD_AUTO|DMA37MD_READ|(chan&3)); 725 } 726 else 727 if (flags & B_READ) 728 outb(DMA2_MODE, DMA37MD_SINGLE|DMA37MD_WRITE|(chan&3)); 729 else 730 outb(DMA2_MODE, DMA37MD_SINGLE|DMA37MD_READ|(chan&3)); 731 outb(DMA2_FFC, 0); 732 733 /* send start address */ 734 waport = DMA2_CHN(chan - 4); 735 outb(waport, phys>>1); 736 outb(waport, phys>>9); 737 outb(dmapageport[chan], phys>>16); 738 739 /* send count */ 740 nbytes >>= 1; 741 outb(waport + 2, --nbytes); 742 outb(waport + 2, nbytes>>8); 743 744 /* unmask channel */ 745 outb(DMA2_SMSK, chan & 3); 746 } 747} 748 749void isa_dmadone(int flags, caddr_t addr, int nbytes, int chan) 750{ 751#ifdef DIAGNOSTIC 752 if (chan & ~VALID_DMA_MASK) 753 panic("isa_dmadone: channel out of range"); 754 755 if (dma_inuse & (1 << chan) == 0) 756 printf("isa_dmadone: channel %d not acquired\n", chan); 757#endif 758 759#if 0 760 /* 761 * XXX This should be checked, but drivers like ad1848 only call 762 * isa_dmastart() once because they use Auto DMA mode. If we 763 * leave this in, drivers that do this will print this continuously. 764 */ 765 if (dma_busy & (1 << chan) == 0) 766 printf("isa_dmadone: channel %d not busy\n", chan); 767#endif 768 769 if (dma_bounced & (1 << chan)) { 770 /* copy bounce buffer on read */ 771 if (flags & B_READ) 772 bcopy(dma_bouncebuf[chan], addr, nbytes); 773 774 dma_bounced &= ~(1 << chan); 775 } 776 dma_busy &= ~(1 << chan); 777} 778 779/* 780 * Check for problems with the address range of a DMA transfer 781 * (non-contiguous physical pages, outside of bus address space, 782 * crossing DMA page boundaries). 783 * Return true if special handling needed. 784 */ 785 786static int 787isa_dmarangecheck(caddr_t va, u_int length, int chan) { 788 vm_offset_t phys, priorpage = 0, endva; 789 u_int dma_pgmsk = (chan & 4) ? ~(128*1024-1) : ~(64*1024-1); 790 791 endva = (vm_offset_t)round_page(va + length); 792 for (; va < (caddr_t) endva ; va += PAGE_SIZE) { 793 phys = trunc_page(pmap_extract(pmap_kernel(), (vm_offset_t)va)); 794#define ISARAM_END RAM_END 795 if (phys == 0) 796 panic("isa_dmacheck: no physical page present"); 797 if (phys >= ISARAM_END) 798 return (1); 799 if (priorpage) { 800 if (priorpage + PAGE_SIZE != phys) 801 return (1); 802 /* check if crossing a DMA page boundary */ 803 if (((u_int)priorpage ^ (u_int)phys) & dma_pgmsk) 804 return (1); 805 } 806 priorpage = phys; 807 } 808 return (0); 809} 810 811#define NMI_PARITY (1 << 7) 812#define NMI_IOCHAN (1 << 6) 813#define ENMI_WATCHDOG (1 << 7) 814#define ENMI_BUSTIMER (1 << 6) 815#define ENMI_IOSTATUS (1 << 5) 816 817/* 818 * Handle a NMI, possibly a machine check. 819 * return true to panic system, false to ignore. 820 */ 821int 822isa_nmi(cd) 823 int cd; 824{ 825 int isa_port = inb(0x61); 826 int eisa_port = inb(0x461); 827 if(isa_port & NMI_PARITY) { 828 panic("RAM parity error, likely hardware failure."); 829 } else if(isa_port & NMI_IOCHAN) { 830 panic("I/O channel check, likely hardware failure."); 831 } else if(eisa_port & ENMI_WATCHDOG) { 832 panic("EISA watchdog timer expired, likely hardware failure."); 833 } else if(eisa_port & ENMI_BUSTIMER) { 834 panic("EISA bus timeout, likely hardware failure."); 835 } else if(eisa_port & ENMI_IOSTATUS) { 836 panic("EISA I/O port status error."); 837 } else { 838 printf("\nNMI ISA %x, EISA %x\n", isa_port, eisa_port); 839 return(0); 840 } 841} 842 843/* 844 * Caught a stray interrupt, notify 845 */ 846static void 847isa_strayintr(d) 848 int d; 849{ 850 851 /* DON'T BOTHER FOR NOW! */ 852 /* for some reason, we get bursts of intr #7, even if not enabled! */ 853 /* 854 * Well the reason you got bursts of intr #7 is because someone 855 * raised an interrupt line and dropped it before the 8259 could 856 * prioritize it. This is documented in the intel data book. This 857 * means you have BAD hardware! I have changed this so that only 858 * the first 5 get logged, then it quits logging them, and puts 859 * out a special message. rgrimes 3/25/1993 860 */ 861 /* 862 * XXX TODO print a different message for #7 if it is for a 863 * glitch. Glitches can be distinguished from real #7's by 864 * testing that the in-service bit is _not_ set. The test 865 * must be done before sending an EOI so it can't be done if 866 * we are using AUTO_EOI_1. 867 */ 868 if (intrcnt[NR_DEVICES + d] <= 5) 869 log(LOG_ERR, "stray irq %d\n", d); 870 if (intrcnt[NR_DEVICES + d] == 5) 871 log(LOG_CRIT, 872 "too many stray irq %d's; not logging any more\n", d); 873} 874 875/* 876 * Find the highest priority enabled display device. Since we can't 877 * distinguish display devices from ttys, depend on display devices 878 * being sensitive and before sensitive non-display devices (if any) 879 * in isa_devtab_tty. 880 * 881 * XXX we should add capability flags IAMDISPLAY and ISUPPORTCONSOLES. 882 */ 883struct isa_device * 884find_display() 885{ 886 struct isa_device *dvp; 887 888 for (dvp = isa_devtab_tty; dvp->id_driver != NULL; dvp++) 889 if (dvp->id_driver->sensitive_hw && dvp->id_enabled) 890 return (dvp); 891 return (NULL); 892} 893 894/* 895 * find an ISA device in a given isa_devtab_* table, given 896 * the table to search, the expected id_driver entry, and the unit number. 897 * 898 * this function is defined in isa_device.h, and this location is debatable; 899 * i put it there because it's useless w/o, and directly operates on 900 * the other stuff in that file. 901 * 902 */ 903 904struct isa_device *find_isadev(table, driverp, unit) 905 struct isa_device *table; 906 struct isa_driver *driverp; 907 int unit; 908{ 909 if (driverp == NULL) /* sanity check */ 910 return NULL; 911 912 while ((table->id_driver != driverp) || (table->id_unit != unit)) { 913 if (table->id_driver == 0) 914 return NULL; 915 916 table++; 917 } 918 919 return table; 920} 921 922/* 923 * Return nonzero if a (masked) irq is pending for a given device. 924 */ 925int 926isa_irq_pending(dvp) 927 struct isa_device *dvp; 928{ 929 unsigned id_irq; 930 931 id_irq = dvp->id_irq; 932 if (id_irq & 0xff) 933 return (inb(IO_ICU1) & id_irq); 934 return (inb(IO_ICU2) & (id_irq >> 8)); 935} 936 937int 938update_intr_masks(void) 939{ 940 int intr, n=0; 941 u_int mask,*maskptr; 942 943 for (intr=0; intr < ICU_LEN; intr ++) { 944 if (intr==2) continue; 945 maskptr = intr_mptr[intr]; 946 if (!maskptr) continue; 947 *maskptr |= 1 << intr; 948 mask = *maskptr; 949 if (mask != intr_mask[intr]) { 950#if 0 951 printf ("intr_mask[%2d] old=%08x new=%08x ptr=%p.\n", 952 intr, intr_mask[intr], mask, maskptr); 953#endif 954 intr_mask[intr]=mask; 955 n++; 956 } 957 958 } 959 return (n); 960} 961 962int 963register_intr(intr, device_id, flags, handler, maskptr, unit) 964 int intr; 965 int device_id; 966 u_int flags; 967 inthand2_t *handler; 968 u_int *maskptr; 969 int unit; 970{ 971 char *cp; 972 u_long ef; 973 int id; 974 u_int mask = (maskptr ? *maskptr : 0); 975 976 if ((u_int)intr >= ICU_LEN || intr == 2 977 || (u_int)device_id >= NR_DEVICES) 978 return (EINVAL); 979 if (intr_handler[intr] != isa_strayintr) 980 return (EBUSY); 981 ef = read_eflags(); 982 disable_intr(); 983 intr_countp[intr] = &intrcnt[device_id]; 984 intr_handler[intr] = handler; 985 intr_mptr[intr] = maskptr; 986 intr_mask[intr] = mask | (1 << intr); 987 intr_unit[intr] = unit; 988 setidt(ICU_OFFSET + intr, 989 flags & RI_FAST ? fastintr[intr] : slowintr[intr], 990 SDT_SYS386IGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 991 write_eflags(ef); 992 for (cp = intrnames, id = 0; id <= device_id; id++) 993 while (*cp++ != '\0') 994 ; 995 if (cp > eintrnames) 996 return (0); 997 if (intr < 10) { 998 cp[-3] = intr + '0'; 999 cp[-2] = ' '; 1000 } else { 1001 cp[-3] = '1'; 1002 cp[-2] = intr - 10 + '0'; 1003 } 1004 return (0); 1005} 1006 1007static void 1008register_imask(dvp, mask) 1009 struct isa_device *dvp; 1010 u_int mask; 1011{ 1012 if (dvp->id_alive && dvp->id_irq) { 1013 int intr; 1014 1015 intr = ffs(dvp->id_irq) - 1; 1016 intr_mask[intr] = mask | (1 <<intr); 1017 } 1018 (void) update_intr_masks(); 1019} 1020 1021int 1022unregister_intr(intr, handler) 1023 int intr; 1024 inthand2_t *handler; 1025{ 1026 u_long ef; 1027 1028 if ((u_int)intr >= ICU_LEN || handler != intr_handler[intr]) 1029 return (EINVAL); 1030 ef = read_eflags(); 1031 disable_intr(); 1032 intr_countp[intr] = &intrcnt[NR_DEVICES + intr]; 1033 intr_handler[intr] = isa_strayintr; 1034 intr_mptr[intr] = NULL; 1035 intr_mask[intr] = HWI_MASK | SWI_MASK; 1036 intr_unit[intr] = intr; 1037 setidt(ICU_OFFSET + intr, slowintr[intr], SDT_SYS386IGT, SEL_KPL, 1038 GSEL(GCODE_SEL, SEL_KPL)); 1039 write_eflags(ef); 1040 return (0); 1041} 1042