isa.c revision 18084
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 1.71 1996/06/25 20:30:36 bde 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/sysctl.h> 55#include <sys/buf.h> 56#include <sys/syslog.h> 57#include <sys/malloc.h> 58#include <machine/md_var.h> 59#include <machine/segments.h> 60#include <vm/vm.h> 61#include <vm/vm_param.h> 62#include <vm/pmap.h> 63#include <i386/isa/isa_device.h> 64#include <i386/isa/isa.h> 65#include <i386/isa/icu.h> 66#include <i386/isa/ic/i8237.h> 67#include "vector.h" 68 69/* 70** Register definitions for DMA controller 1 (channels 0..3): 71*/ 72#define DMA1_CHN(c) (IO_DMA1 + 1*(2*(c))) /* addr reg for channel c */ 73#define DMA1_SMSK (IO_DMA1 + 1*10) /* single mask register */ 74#define DMA1_MODE (IO_DMA1 + 1*11) /* mode register */ 75#define DMA1_FFC (IO_DMA1 + 1*12) /* clear first/last FF */ 76 77/* 78** Register definitions for DMA controller 2 (channels 4..7): 79*/ 80#define DMA2_CHN(c) (IO_DMA2 + 2*(2*(c))) /* addr reg for channel c */ 81#define DMA2_SMSK (IO_DMA2 + 2*10) /* single mask register */ 82#define DMA2_MODE (IO_DMA2 + 2*11) /* mode register */ 83#define DMA2_FFC (IO_DMA2 + 2*12) /* clear first/last FF */ 84 85u_long *intr_countp[ICU_LEN]; 86inthand2_t *intr_handler[ICU_LEN]; 87u_int intr_mask[ICU_LEN]; 88u_int* intr_mptr[ICU_LEN]; 89int intr_unit[ICU_LEN]; 90 91static inthand_t *fastintr[ICU_LEN] = { 92 &IDTVEC(fastintr0), &IDTVEC(fastintr1), 93 &IDTVEC(fastintr2), &IDTVEC(fastintr3), 94 &IDTVEC(fastintr4), &IDTVEC(fastintr5), 95 &IDTVEC(fastintr6), &IDTVEC(fastintr7), 96 &IDTVEC(fastintr8), &IDTVEC(fastintr9), 97 &IDTVEC(fastintr10), &IDTVEC(fastintr11), 98 &IDTVEC(fastintr12), &IDTVEC(fastintr13), 99 &IDTVEC(fastintr14), &IDTVEC(fastintr15) 100}; 101 102static inthand_t *slowintr[ICU_LEN] = { 103 &IDTVEC(intr0), &IDTVEC(intr1), &IDTVEC(intr2), &IDTVEC(intr3), 104 &IDTVEC(intr4), &IDTVEC(intr5), &IDTVEC(intr6), &IDTVEC(intr7), 105 &IDTVEC(intr8), &IDTVEC(intr9), &IDTVEC(intr10), &IDTVEC(intr11), 106 &IDTVEC(intr12), &IDTVEC(intr13), &IDTVEC(intr14), &IDTVEC(intr15) 107}; 108 109static void config_isadev __P((struct isa_device *isdp, u_int *mp)); 110static void config_isadev_c __P((struct isa_device *isdp, u_int *mp, 111 int reconfig)); 112static void conflict __P((struct isa_device *dvp, struct isa_device *tmpdvp, 113 int item, char const *whatnot, char const *reason, 114 char const *format)); 115static int haveseen __P((struct isa_device *dvp, struct isa_device *tmpdvp, 116 u_int checkbits)); 117static int isa_dmarangecheck __P((caddr_t va, u_int length, int chan)); 118static inthand2_t isa_strayintr; 119static void register_imask __P((struct isa_device *dvp, u_int mask)); 120 121/* 122 * print a conflict message 123 */ 124static void 125conflict(dvp, tmpdvp, item, whatnot, reason, format) 126 struct isa_device *dvp; 127 struct isa_device *tmpdvp; 128 int item; 129 char const *whatnot; 130 char const *reason; 131 char const *format; 132{ 133 printf("%s%d not %sed due to %s conflict with %s%d at ", 134 dvp->id_driver->name, dvp->id_unit, whatnot, reason, 135 tmpdvp->id_driver->name, tmpdvp->id_unit); 136 printf(format, item); 137 printf("\n"); 138} 139 140/* 141 * Check to see if things are already in use, like IRQ's, I/O addresses 142 * and Memory addresses. 143 */ 144static int 145haveseen(dvp, tmpdvp, checkbits) 146 struct isa_device *dvp; 147 struct isa_device *tmpdvp; 148 u_int checkbits; 149{ 150 /* 151 * Only check against devices that have already been found and are not 152 * unilaterally allowed to conflict anyway. 153 */ 154 if (tmpdvp->id_alive && !dvp->id_conflicts) { 155 char const *whatnot; 156 157 whatnot = checkbits & CC_ATTACH ? "attach" : "prob"; 158 /* 159 * Check for I/O address conflict. We can only check the 160 * starting address of the device against the range of the 161 * device that has already been probed since we do not 162 * know how many I/O addresses this device uses. 163 */ 164 if (checkbits & CC_IOADDR && tmpdvp->id_alive != -1) { 165 if ((dvp->id_iobase >= tmpdvp->id_iobase) && 166 (dvp->id_iobase <= 167 (tmpdvp->id_iobase + tmpdvp->id_alive - 1))) { 168 conflict(dvp, tmpdvp, dvp->id_iobase, whatnot, 169 "I/O address", "0x%x"); 170 return 1; 171 } 172 } 173 /* 174 * Check for Memory address conflict. We can check for 175 * range overlap, but it will not catch all cases since the 176 * driver may adjust the msize paramater during probe, for 177 * now we just check that the starting address does not 178 * fall within any allocated region. 179 * XXX could add a second check after the probe for overlap, 180 * since at that time we would know the full range. 181 * XXX KERNBASE is a hack, we should have vaddr in the table! 182 */ 183 if (checkbits & CC_MEMADDR && tmpdvp->id_maddr) { 184 if ((KERNBASE + dvp->id_maddr >= tmpdvp->id_maddr) && 185 (KERNBASE + dvp->id_maddr <= 186 (tmpdvp->id_maddr + tmpdvp->id_msize - 1))) { 187 conflict(dvp, tmpdvp, (int)dvp->id_maddr, 188 whatnot, "maddr", "0x%x"); 189 return 1; 190 } 191 } 192 /* 193 * Check for IRQ conflicts. 194 */ 195 if (checkbits & CC_IRQ && tmpdvp->id_irq) { 196 if (tmpdvp->id_irq == dvp->id_irq) { 197 conflict(dvp, tmpdvp, ffs(dvp->id_irq) - 1, 198 whatnot, "irq", "%d"); 199 return 1; 200 } 201 } 202 /* 203 * Check for DRQ conflicts. 204 */ 205 if (checkbits & CC_DRQ && tmpdvp->id_drq != -1) { 206 if (tmpdvp->id_drq == dvp->id_drq) { 207 conflict(dvp, tmpdvp, dvp->id_drq, whatnot, 208 "drq", "%d"); 209 return 1; 210 } 211 } 212 } 213 return 0; 214} 215 216/* 217 * Search through all the isa_devtab_* tables looking for anything that 218 * conflicts with the current device. 219 */ 220int 221haveseen_isadev(dvp, checkbits) 222 struct isa_device *dvp; 223 u_int checkbits; 224{ 225 struct isa_device *tmpdvp; 226 int status = 0; 227 228 for (tmpdvp = isa_devtab_tty; tmpdvp->id_driver; tmpdvp++) { 229 status |= haveseen(dvp, tmpdvp, checkbits); 230 if (status) 231 return status; 232 } 233 for (tmpdvp = isa_devtab_bio; tmpdvp->id_driver; tmpdvp++) { 234 status |= haveseen(dvp, tmpdvp, checkbits); 235 if (status) 236 return status; 237 } 238 for (tmpdvp = isa_devtab_net; tmpdvp->id_driver; tmpdvp++) { 239 status |= haveseen(dvp, tmpdvp, checkbits); 240 if (status) 241 return status; 242 } 243 for (tmpdvp = isa_devtab_null; tmpdvp->id_driver; tmpdvp++) { 244 status |= haveseen(dvp, tmpdvp, checkbits); 245 if (status) 246 return status; 247 } 248 return(status); 249} 250 251/* 252 * Configure all ISA devices 253 */ 254void 255isa_configure() { 256 struct isa_device *dvp; 257 258 splhigh(); 259 printf("Probing for devices on the ISA bus:\n"); 260 /* First probe all the sensitive probes */ 261 for (dvp = isa_devtab_tty; dvp->id_driver; dvp++) 262 if (dvp->id_driver->sensitive_hw) 263 config_isadev(dvp, &tty_imask); 264 for (dvp = isa_devtab_bio; dvp->id_driver; dvp++) 265 if (dvp->id_driver->sensitive_hw) 266 config_isadev(dvp, &bio_imask); 267 for (dvp = isa_devtab_net; dvp->id_driver; dvp++) 268 if (dvp->id_driver->sensitive_hw) 269 config_isadev(dvp, &net_imask); 270 for (dvp = isa_devtab_null; dvp->id_driver; dvp++) 271 if (dvp->id_driver->sensitive_hw) 272 config_isadev(dvp, (u_int *)NULL); 273 274 /* Then all the bad ones */ 275 for (dvp = isa_devtab_tty; dvp->id_driver; dvp++) 276 if (!dvp->id_driver->sensitive_hw) 277 config_isadev(dvp, &tty_imask); 278 for (dvp = isa_devtab_bio; dvp->id_driver; dvp++) 279 if (!dvp->id_driver->sensitive_hw) 280 config_isadev(dvp, &bio_imask); 281 for (dvp = isa_devtab_net; dvp->id_driver; dvp++) 282 if (!dvp->id_driver->sensitive_hw) 283 config_isadev(dvp, &net_imask); 284 for (dvp = isa_devtab_null; dvp->id_driver; dvp++) 285 if (!dvp->id_driver->sensitive_hw) 286 config_isadev(dvp, (u_int *)NULL); 287 288 bio_imask |= SWI_CLOCK_MASK; 289 net_imask |= SWI_NET_MASK; 290 tty_imask |= SWI_TTY_MASK; 291 292/* 293 * XXX we should really add the tty device to net_imask when the line is 294 * switched to SLIPDISC, and then remove it when it is switched away from 295 * SLIPDISC. No need to block out ALL ttys during a splimp when only one 296 * of them is running slip. 297 * 298 * XXX actually, blocking all ttys during a splimp doesn't matter so much 299 * with sio because the serial interrupt layer doesn't use tty_imask. Only 300 * non-serial ttys suffer. It's more stupid that ALL 'net's are blocked 301 * during spltty. 302 */ 303#include "sl.h" 304#if NSL > 0 305 net_imask |= tty_imask; 306 tty_imask = net_imask; 307#endif 308 309 /* bio_imask |= tty_imask ; can some tty devices use buffers? */ 310 311 if (bootverbose) 312 printf("imasks: bio %x, tty %x, net %x\n", 313 bio_imask, tty_imask, net_imask); 314 315 /* 316 * Finish initializing intr_mask[]. Note that the partly 317 * constructed masks aren't actually used since we're at splhigh. 318 * For fully dynamic initialization, register_intr() and 319 * unregister_intr() will have to adjust the masks for _all_ 320 * interrupts and for tty_imask, etc. 321 */ 322 for (dvp = isa_devtab_tty; dvp->id_driver; dvp++) 323 register_imask(dvp, tty_imask); 324 for (dvp = isa_devtab_bio; dvp->id_driver; dvp++) 325 register_imask(dvp, bio_imask); 326 for (dvp = isa_devtab_net; dvp->id_driver; dvp++) 327 register_imask(dvp, net_imask); 328 for (dvp = isa_devtab_null; dvp->id_driver; dvp++) 329 register_imask(dvp, SWI_CLOCK_MASK); 330 spl0(); 331} 332 333/* 334 * Configure an ISA device. 335 */ 336 337 338static void 339config_isadev(isdp, mp) 340 struct isa_device *isdp; 341 u_int *mp; 342{ 343 config_isadev_c(isdp, mp, 0); 344} 345 346void 347reconfig_isadev(isdp, mp) 348 struct isa_device *isdp; 349 u_int *mp; 350{ 351 config_isadev_c(isdp, mp, 1); 352} 353 354static void 355config_isadev_c(isdp, mp, reconfig) 356 struct isa_device *isdp; 357 u_int *mp; 358 int reconfig; 359{ 360 u_int checkbits; 361 int id_alive; 362 int last_alive; 363 struct isa_driver *dp = isdp->id_driver; 364 365 if (!isdp->id_enabled) { 366 printf("%s%d: disabled, not probed.\n", 367 dp->name, isdp->id_unit); 368 return; 369 } 370 checkbits = CC_DRQ | CC_IOADDR | CC_MEMADDR; 371 if (!reconfig && haveseen_isadev(isdp, checkbits)) 372 return; 373 if (!reconfig && isdp->id_maddr) { 374 isdp->id_maddr -= 0xa0000; /* XXX should be a define */ 375 isdp->id_maddr += atdevbase; 376 } 377 if (reconfig) { 378 last_alive = isdp->id_alive; 379 isdp->id_reconfig = 1; 380 } 381 else { 382 last_alive = 0; 383 isdp->id_reconfig = 0; 384 } 385 id_alive = (*dp->probe)(isdp); 386 if (id_alive) { 387 /* 388 * Only print the I/O address range if id_alive != -1 389 * Right now this is a temporary fix just for the new 390 * NPX code so that if it finds a 486 that can use trap 391 * 16 it will not report I/O addresses. 392 * Rod Grimes 04/26/94 393 */ 394 if (!isdp->id_reconfig) { 395 printf("%s%d", dp->name, isdp->id_unit); 396 if (id_alive != -1) { 397 printf(" at 0x%x", isdp->id_iobase); 398 if (isdp->id_iobase + id_alive - 1 != 399 isdp->id_iobase) { 400 printf("-0x%x", 401 isdp->id_iobase + id_alive - 1); 402 } 403 } 404 if (isdp->id_irq) 405 printf(" irq %d", ffs(isdp->id_irq) - 1); 406 if (isdp->id_drq != -1) 407 printf(" drq %d", isdp->id_drq); 408 if (isdp->id_maddr) 409 printf(" maddr 0x%lx", kvtop(isdp->id_maddr)); 410 if (isdp->id_msize) 411 printf(" msize %d", isdp->id_msize); 412 if (isdp->id_flags) 413 printf(" flags 0x%x", isdp->id_flags); 414 if (isdp->id_iobase && !(isdp->id_iobase & 0xf300)) { 415 printf(" on motherboard"); 416 } else if (isdp->id_iobase >= 0x1000 && 417 !(isdp->id_iobase & 0x300)) { 418 printf (" on eisa slot %d", 419 isdp->id_iobase >> 12); 420 } else { 421 printf (" on isa"); 422 } 423 printf("\n"); 424 /* 425 * Check for conflicts again. The driver may have 426 * changed *dvp. We should weaken the early check 427 * since the driver may have been able to change 428 * *dvp to avoid conflicts if given a chance. We 429 * already skip the early check for IRQs and force 430 * a check for IRQs in the next group of checks. 431 */ 432 checkbits |= CC_IRQ; 433 if (haveseen_isadev(isdp, checkbits)) 434 return; 435 isdp->id_alive = id_alive; 436 } 437 (*dp->attach)(isdp); 438 if (isdp->id_irq) { 439 if (mp) 440 INTRMASK(*mp, isdp->id_irq); 441 register_intr(ffs(isdp->id_irq) - 1, isdp->id_id, 442 isdp->id_ri_flags, isdp->id_intr, 443 mp, isdp->id_unit); 444 INTREN(isdp->id_irq); 445 } 446 } else { 447 if (isdp->id_reconfig) { 448 (*dp->attach)(isdp); /* reconfiguration attach */ 449 } 450 if (!last_alive) { 451 if (!isdp->id_reconfig) { 452 printf("%s%d not found", 453 dp->name, isdp->id_unit); 454 if (isdp->id_iobase) { 455 printf(" at 0x%x", isdp->id_iobase); 456 } 457 printf("\n"); 458 } 459 } 460 else { 461 /* This code has not been tested.... */ 462 if (isdp->id_irq) { 463 INTRDIS(isdp->id_irq); 464 unregister_intr(ffs(isdp->id_irq) - 1, 465 isdp->id_intr); 466 if (mp) 467 INTRUNMASK(*mp, isdp->id_irq); 468 } 469 } 470 } 471} 472 473/* 474 * Fill in default interrupt table (in case of spuruious interrupt 475 * during configuration of kernel, setup interrupt control unit 476 */ 477void 478isa_defaultirq() 479{ 480 int i; 481 482 /* icu vectors */ 483 for (i = 0; i < ICU_LEN; i++) 484 unregister_intr(i, (inthand2_t *)NULL); 485 486 /* initialize 8259's */ 487 outb(IO_ICU1, 0x11); /* reset; program device, four bytes */ 488 outb(IO_ICU1+1, NRSVIDT); /* starting at this vector index */ 489 outb(IO_ICU1+1, 1<<2); /* slave on line 2 */ 490#ifdef AUTO_EOI_1 491 outb(IO_ICU1+1, 2 | 1); /* auto EOI, 8086 mode */ 492#else 493 outb(IO_ICU1+1, 1); /* 8086 mode */ 494#endif 495 outb(IO_ICU1+1, 0xff); /* leave interrupts masked */ 496 outb(IO_ICU1, 0x0a); /* default to IRR on read */ 497 outb(IO_ICU1, 0xc0 | (3 - 1)); /* pri order 3-7, 0-2 (com2 first) */ 498 499 outb(IO_ICU2, 0x11); /* reset; program device, four bytes */ 500 outb(IO_ICU2+1, NRSVIDT+8); /* staring at this vector index */ 501 outb(IO_ICU2+1,2); /* my slave id is 2 */ 502#ifdef AUTO_EOI_2 503 outb(IO_ICU2+1, 2 | 1); /* auto EOI, 8086 mode */ 504#else 505 outb(IO_ICU2+1,1); /* 8086 mode */ 506#endif 507 outb(IO_ICU2+1, 0xff); /* leave interrupts masked */ 508 outb(IO_ICU2, 0x0a); /* default to IRR on read */ 509} 510 511static caddr_t dma_bouncebuf[8]; 512static u_int dma_bouncebufsize[8]; 513static u_int8_t dma_bounced = 0; 514static u_int8_t dma_busy = 0; /* Used in isa_dmastart() */ 515static u_int8_t dma_inuse = 0; /* User for acquire/release */ 516 517#define VALID_DMA_MASK (7) 518 519/* high byte of address is stored in this port for i-th dma channel */ 520static short dmapageport[8] = 521 { 0x87, 0x83, 0x81, 0x82, 0x8f, 0x8b, 0x89, 0x8a }; 522 523/* 524 * Setup a DMA channel's bounce buffer. 525 */ 526void 527isa_dmainit(chan, bouncebufsize) 528 int chan; 529 u_int bouncebufsize; 530{ 531 void *buf; 532 533#ifdef DIAGNOSTIC 534 if (chan & ~VALID_DMA_MASK) 535 panic("isa_dmainit: channel out of range"); 536 537 if (dma_bouncebuf[chan] != NULL) 538 panic("isa_dmainit: impossible request"); 539#endif 540 541 dma_bouncebufsize[chan] = bouncebufsize; 542 543 /* Try malloc() first. It works better if it works. */ 544 buf = malloc(bouncebufsize, M_DEVBUF, M_NOWAIT); 545 if (buf != NULL) { 546 if (isa_dmarangecheck(buf, bouncebufsize, chan) == 0) { 547 dma_bouncebuf[chan] = buf; 548 return; 549 } 550 free(buf, M_DEVBUF); 551 } 552 buf = contigmalloc(bouncebufsize, M_DEVBUF, M_NOWAIT, 0ul, 0xfffffful, 553 1ul, chan & 4 ? 0x20000ul : 0x10000ul); 554 if (buf == NULL) 555 printf("isa_dmainit(%d, %d) failed\n", chan, bouncebufsize); 556 else 557 dma_bouncebuf[chan] = buf; 558} 559 560/* 561 * Register a DMA channel's usage. Usually called from a device driver 562 * in open() or during it's initialization. 563 */ 564int 565isa_dma_acquire(chan) 566 int chan; 567{ 568#ifdef DIAGNOSTIC 569 if (chan & ~VALID_DMA_MASK) 570 panic("isa_dma_acquire: channel out of range"); 571#endif 572 573 if (dma_inuse & (1 << chan)) { 574 printf("isa_dma_acquire: channel %d already in use\n", chan); 575 return (EBUSY); 576 } 577 dma_inuse |= (1 << chan); 578 579 return (0); 580} 581 582/* 583 * Unregister a DMA channel's usage. Usually called from a device driver 584 * during close() or during it's shutdown. 585 */ 586void 587isa_dma_release(chan) 588 int chan; 589{ 590#ifdef DIAGNOSTIC 591 if (chan & ~VALID_DMA_MASK) 592 panic("isa_dma_release: channel out of range"); 593 594 if (dma_inuse & (1 << chan) == 0) 595 printf("isa_dma_release: channel %d not in use\n", chan); 596#endif 597 598 if (dma_busy & (1 << chan)) { 599 dma_busy &= ~(1 << chan); 600 /* 601 * XXX We should also do "dma_bounced &= (1 << chan);" 602 * because we are acting on behalf of isa_dmadone() which 603 * was not called to end the last DMA operation. This does 604 * not matter now, but it may in the future. 605 */ 606 } 607 608 dma_inuse &= ~(1 << chan); 609} 610 611/* 612 * isa_dmacascade(): program 8237 DMA controller channel to accept 613 * external dma control by a board. 614 */ 615void isa_dmacascade(chan) 616 int chan; 617{ 618#ifdef DIAGNOSTIC 619 if (chan & ~VALID_DMA_MASK) 620 panic("isa_dmacascade: channel out of range"); 621#endif 622 623 /* set dma channel mode, and set dma channel mode */ 624 if ((chan & 4) == 0) { 625 outb(DMA1_MODE, DMA37MD_CASCADE | chan); 626 outb(DMA1_SMSK, chan); 627 } else { 628 outb(DMA2_MODE, DMA37MD_CASCADE | (chan & 3)); 629 outb(DMA2_SMSK, chan & 3); 630 } 631} 632 633/* 634 * isa_dmastart(): program 8237 DMA controller channel, avoid page alignment 635 * problems by using a bounce buffer. 636 */ 637void isa_dmastart(int flags, caddr_t addr, u_int nbytes, int chan) 638{ 639 vm_offset_t phys; 640 int waport; 641 caddr_t newaddr; 642 643#ifdef DIAGNOSTIC 644 if (chan & ~VALID_DMA_MASK) 645 panic("isa_dmastart: channel out of range"); 646 647 if ((chan < 4 && nbytes > (1<<16)) 648 || (chan >= 4 && (nbytes > (1<<17) || (u_int)addr & 1))) 649 panic("isa_dmastart: impossible request"); 650 651 if (dma_inuse & (1 << chan) == 0) 652 printf("isa_dmastart: channel %d not acquired\n", chan); 653#endif 654 655 if (dma_busy & (1 << chan)) 656 printf("isa_dmastart: channel %d busy\n", chan); 657 658 dma_busy |= (1 << chan); 659 660 if (isa_dmarangecheck(addr, nbytes, chan)) { 661 if (dma_bouncebuf[chan] == NULL 662 || dma_bouncebufsize[chan] < nbytes) 663 panic("isa_dmastart: bad bounce buffer"); 664 dma_bounced |= (1 << chan); 665 newaddr = dma_bouncebuf[chan]; 666 667 /* copy bounce buffer on write */ 668 if (!(flags & B_READ)) 669 bcopy(addr, newaddr, nbytes); 670 addr = newaddr; 671 } 672 673 /* translate to physical */ 674 phys = pmap_extract(pmap_kernel(), (vm_offset_t)addr); 675 676 if ((chan & 4) == 0) { 677 /* 678 * Program one of DMA channels 0..3. These are 679 * byte mode channels. 680 */ 681 /* set dma channel mode, and reset address ff */ 682 683 /* If B_RAW flag is set, then use autoinitialise mode */ 684 if (flags & B_RAW) { 685 if (flags & B_READ) 686 outb(DMA1_MODE, DMA37MD_AUTO|DMA37MD_WRITE|chan); 687 else 688 outb(DMA1_MODE, DMA37MD_AUTO|DMA37MD_READ|chan); 689 } 690 else 691 if (flags & B_READ) 692 outb(DMA1_MODE, DMA37MD_SINGLE|DMA37MD_WRITE|chan); 693 else 694 outb(DMA1_MODE, DMA37MD_SINGLE|DMA37MD_READ|chan); 695 outb(DMA1_FFC, 0); 696 697 /* send start address */ 698 waport = DMA1_CHN(chan); 699 outb(waport, phys); 700 outb(waport, phys>>8); 701 outb(dmapageport[chan], phys>>16); 702 703 /* send count */ 704 outb(waport + 1, --nbytes); 705 outb(waport + 1, nbytes>>8); 706 707 /* unmask channel */ 708 outb(DMA1_SMSK, chan); 709 } else { 710 /* 711 * Program one of DMA channels 4..7. These are 712 * word mode channels. 713 */ 714 /* set dma channel mode, and reset address ff */ 715 716 /* If B_RAW flag is set, then use autoinitialise mode */ 717 if (flags & B_RAW) { 718 if (flags & B_READ) 719 outb(DMA2_MODE, DMA37MD_AUTO|DMA37MD_WRITE|(chan&3)); 720 else 721 outb(DMA2_MODE, DMA37MD_AUTO|DMA37MD_READ|(chan&3)); 722 } 723 else 724 if (flags & B_READ) 725 outb(DMA2_MODE, DMA37MD_SINGLE|DMA37MD_WRITE|(chan&3)); 726 else 727 outb(DMA2_MODE, DMA37MD_SINGLE|DMA37MD_READ|(chan&3)); 728 outb(DMA2_FFC, 0); 729 730 /* send start address */ 731 waport = DMA2_CHN(chan - 4); 732 outb(waport, phys>>1); 733 outb(waport, phys>>9); 734 outb(dmapageport[chan], phys>>16); 735 736 /* send count */ 737 nbytes >>= 1; 738 outb(waport + 2, --nbytes); 739 outb(waport + 2, nbytes>>8); 740 741 /* unmask channel */ 742 outb(DMA2_SMSK, chan & 3); 743 } 744} 745 746void isa_dmadone(int flags, caddr_t addr, int nbytes, int chan) 747{ 748#ifdef DIAGNOSTIC 749 if (chan & ~VALID_DMA_MASK) 750 panic("isa_dmadone: channel out of range"); 751 752 if (dma_inuse & (1 << chan) == 0) 753 printf("isa_dmadone: channel %d not acquired\n", chan); 754#endif 755 756#if 0 757 /* 758 * XXX This should be checked, but drivers like ad1848 only call 759 * isa_dmastart() once because they use Auto DMA mode. If we 760 * leave this in, drivers that do this will print this continuously. 761 */ 762 if (dma_busy & (1 << chan) == 0) 763 printf("isa_dmadone: channel %d not busy\n", chan); 764#endif 765 766 if (dma_bounced & (1 << chan)) { 767 /* copy bounce buffer on read */ 768 if (flags & B_READ) 769 bcopy(dma_bouncebuf[chan], addr, nbytes); 770 771 dma_bounced &= ~(1 << chan); 772 } 773 dma_busy &= ~(1 << chan); 774} 775 776/* 777 * Check for problems with the address range of a DMA transfer 778 * (non-contiguous physical pages, outside of bus address space, 779 * crossing DMA page boundaries). 780 * Return true if special handling needed. 781 */ 782 783static int 784isa_dmarangecheck(caddr_t va, u_int length, int chan) { 785 vm_offset_t phys, priorpage = 0, endva; 786 u_int dma_pgmsk = (chan & 4) ? ~(128*1024-1) : ~(64*1024-1); 787 788 endva = (vm_offset_t)round_page(va + length); 789 for (; va < (caddr_t) endva ; va += PAGE_SIZE) { 790 phys = trunc_page(pmap_extract(pmap_kernel(), (vm_offset_t)va)); 791#define ISARAM_END RAM_END 792 if (phys == 0) 793 panic("isa_dmacheck: no physical page present"); 794 if (phys >= ISARAM_END) 795 return (1); 796 if (priorpage) { 797 if (priorpage + PAGE_SIZE != phys) 798 return (1); 799 /* check if crossing a DMA page boundary */ 800 if (((u_int)priorpage ^ (u_int)phys) & dma_pgmsk) 801 return (1); 802 } 803 priorpage = phys; 804 } 805 return (0); 806} 807 808#define NMI_PARITY (1 << 7) 809#define NMI_IOCHAN (1 << 6) 810#define ENMI_WATCHDOG (1 << 7) 811#define ENMI_BUSTIMER (1 << 6) 812#define ENMI_IOSTATUS (1 << 5) 813 814/* 815 * Handle a NMI, possibly a machine check. 816 * return true to panic system, false to ignore. 817 */ 818int 819isa_nmi(cd) 820 int cd; 821{ 822 int isa_port = inb(0x61); 823 int eisa_port = inb(0x461); 824 if(isa_port & NMI_PARITY) { 825 panic("RAM parity error, likely hardware failure."); 826 } else if(isa_port & NMI_IOCHAN) { 827 panic("I/O channel check, likely hardware failure."); 828 } else if(eisa_port & ENMI_WATCHDOG) { 829 panic("EISA watchdog timer expired, likely hardware failure."); 830 } else if(eisa_port & ENMI_BUSTIMER) { 831 panic("EISA bus timeout, likely hardware failure."); 832 } else if(eisa_port & ENMI_IOSTATUS) { 833 panic("EISA I/O port status error."); 834 } else { 835 printf("\nNMI ISA %x, EISA %x\n", isa_port, eisa_port); 836 return(0); 837 } 838} 839 840/* 841 * Caught a stray interrupt, notify 842 */ 843static void 844isa_strayintr(d) 845 int d; 846{ 847 848 /* DON'T BOTHER FOR NOW! */ 849 /* for some reason, we get bursts of intr #7, even if not enabled! */ 850 /* 851 * Well the reason you got bursts of intr #7 is because someone 852 * raised an interrupt line and dropped it before the 8259 could 853 * prioritize it. This is documented in the intel data book. This 854 * means you have BAD hardware! I have changed this so that only 855 * the first 5 get logged, then it quits logging them, and puts 856 * out a special message. rgrimes 3/25/1993 857 */ 858 /* 859 * XXX TODO print a different message for #7 if it is for a 860 * glitch. Glitches can be distinguished from real #7's by 861 * testing that the in-service bit is _not_ set. The test 862 * must be done before sending an EOI so it can't be done if 863 * we are using AUTO_EOI_1. 864 */ 865 if (intrcnt[NR_DEVICES + d] <= 5) 866 log(LOG_ERR, "stray irq %d\n", d); 867 if (intrcnt[NR_DEVICES + d] == 5) 868 log(LOG_CRIT, 869 "too many stray irq %d's; not logging any more\n", d); 870} 871 872/* 873 * Find the highest priority enabled display device. Since we can't 874 * distinguish display devices from ttys, depend on display devices 875 * being sensitive and before sensitive non-display devices (if any) 876 * in isa_devtab_tty. 877 * 878 * XXX we should add capability flags IAMDISPLAY and ISUPPORTCONSOLES. 879 */ 880struct isa_device * 881find_display() 882{ 883 struct isa_device *dvp; 884 885 for (dvp = isa_devtab_tty; dvp->id_driver != NULL; dvp++) 886 if (dvp->id_driver->sensitive_hw && dvp->id_enabled) 887 return (dvp); 888 return (NULL); 889} 890 891/* 892 * find an ISA device in a given isa_devtab_* table, given 893 * the table to search, the expected id_driver entry, and the unit number. 894 * 895 * this function is defined in isa_device.h, and this location is debatable; 896 * i put it there because it's useless w/o, and directly operates on 897 * the other stuff in that file. 898 * 899 */ 900 901struct isa_device *find_isadev(table, driverp, unit) 902 struct isa_device *table; 903 struct isa_driver *driverp; 904 int unit; 905{ 906 if (driverp == NULL) /* sanity check */ 907 return NULL; 908 909 while ((table->id_driver != driverp) || (table->id_unit != unit)) { 910 if (table->id_driver == 0) 911 return NULL; 912 913 table++; 914 } 915 916 return table; 917} 918 919/* 920 * Return nonzero if a (masked) irq is pending for a given device. 921 */ 922int 923isa_irq_pending(dvp) 924 struct isa_device *dvp; 925{ 926 unsigned id_irq; 927 928 id_irq = dvp->id_irq; 929 if (id_irq & 0xff) 930 return (inb(IO_ICU1) & id_irq); 931 return (inb(IO_ICU2) & (id_irq >> 8)); 932} 933 934int 935update_intr_masks(void) 936{ 937 int intr, n=0; 938 u_int mask,*maskptr; 939 940 for (intr=0; intr < ICU_LEN; intr ++) { 941 if (intr==2) continue; 942 maskptr = intr_mptr[intr]; 943 if (!maskptr) continue; 944 *maskptr |= 1 << intr; 945 mask = *maskptr; 946 if (mask != intr_mask[intr]) { 947#if 0 948 printf ("intr_mask[%2d] old=%08x new=%08x ptr=%p.\n", 949 intr, intr_mask[intr], mask, maskptr); 950#endif 951 intr_mask[intr]=mask; 952 n++; 953 } 954 955 } 956 return (n); 957} 958 959int 960register_intr(intr, device_id, flags, handler, maskptr, unit) 961 int intr; 962 int device_id; 963 u_int flags; 964 inthand2_t *handler; 965 u_int *maskptr; 966 int unit; 967{ 968 char *cp; 969 u_long ef; 970 int id; 971 u_int mask = (maskptr ? *maskptr : 0); 972 973 if ((u_int)intr >= ICU_LEN || intr == 2 974 || (u_int)device_id >= NR_DEVICES) 975 return (EINVAL); 976 if (intr_handler[intr] != isa_strayintr) 977 return (EBUSY); 978 ef = read_eflags(); 979 disable_intr(); 980 intr_countp[intr] = &intrcnt[device_id]; 981 intr_handler[intr] = handler; 982 intr_mptr[intr] = maskptr; 983 intr_mask[intr] = mask | (1 << intr); 984 intr_unit[intr] = unit; 985 setidt(ICU_OFFSET + intr, 986 flags & RI_FAST ? fastintr[intr] : slowintr[intr], 987 SDT_SYS386IGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 988 write_eflags(ef); 989 for (cp = intrnames, id = 0; id <= device_id; id++) 990 while (*cp++ != '\0') 991 ; 992 if (cp > eintrnames) 993 return (0); 994 if (intr < 10) { 995 cp[-3] = intr + '0'; 996 cp[-2] = ' '; 997 } else { 998 cp[-3] = '1'; 999 cp[-2] = intr - 10 + '0'; 1000 } 1001 return (0); 1002} 1003 1004static void 1005register_imask(dvp, mask) 1006 struct isa_device *dvp; 1007 u_int mask; 1008{ 1009 if (dvp->id_alive && dvp->id_irq) { 1010 int intr; 1011 1012 intr = ffs(dvp->id_irq) - 1; 1013 intr_mask[intr] = mask | (1 <<intr); 1014 } 1015 (void) update_intr_masks(); 1016} 1017 1018int 1019unregister_intr(intr, handler) 1020 int intr; 1021 inthand2_t *handler; 1022{ 1023 u_long ef; 1024 1025 if ((u_int)intr >= ICU_LEN || handler != intr_handler[intr]) 1026 return (EINVAL); 1027 ef = read_eflags(); 1028 disable_intr(); 1029 intr_countp[intr] = &intrcnt[NR_DEVICES + intr]; 1030 intr_handler[intr] = isa_strayintr; 1031 intr_mptr[intr] = NULL; 1032 intr_mask[intr] = HWI_MASK | SWI_MASK; 1033 intr_unit[intr] = intr; 1034 setidt(ICU_OFFSET + intr, slowintr[intr], SDT_SYS386IGT, SEL_KPL, 1035 GSEL(GCODE_SEL, SEL_KPL)); 1036 write_eflags(ef); 1037 return (0); 1038} 1039