isa.c revision 18233
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 1.72 1996/09/06 23:07:45 phk 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 -= 0xa0000; /* XXX should be a define */ 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 printf(" at 0x%x", isdp->id_iobase); 397 if (isdp->id_iobase + id_alive - 1 != 398 isdp->id_iobase) { 399 printf("-0x%x", 400 isdp->id_iobase + id_alive - 1); 401 } 402 } 403 if (isdp->id_irq) 404 printf(" irq %d", ffs(isdp->id_irq) - 1); 405 if (isdp->id_drq != -1) 406 printf(" drq %d", isdp->id_drq); 407 if (isdp->id_maddr) 408 printf(" maddr 0x%lx", kvtop(isdp->id_maddr)); 409 if (isdp->id_msize) 410 printf(" msize %d", isdp->id_msize); 411 if (isdp->id_flags) 412 printf(" flags 0x%x", isdp->id_flags); 413 if (isdp->id_iobase && !(isdp->id_iobase & 0xf300)) { 414 printf(" on motherboard"); 415 } else if (isdp->id_iobase >= 0x1000 && 416 !(isdp->id_iobase & 0x300)) { 417 printf (" on eisa slot %d", 418 isdp->id_iobase >> 12); 419 } else { 420 printf (" on isa"); 421 } 422 printf("\n"); 423 /* 424 * Check for conflicts again. The driver may have 425 * changed *dvp. We should weaken the early check 426 * since the driver may have been able to change 427 * *dvp to avoid conflicts if given a chance. We 428 * already skip the early check for IRQs and force 429 * a check for IRQs in the next group of checks. 430 */ 431 checkbits |= CC_IRQ; 432 if (haveseen_isadev(isdp, checkbits)) 433 return; 434 isdp->id_alive = id_alive; 435 } 436 (*dp->attach)(isdp); 437 if (isdp->id_irq) { 438 if (mp) 439 INTRMASK(*mp, isdp->id_irq); 440 register_intr(ffs(isdp->id_irq) - 1, isdp->id_id, 441 isdp->id_ri_flags, isdp->id_intr, 442 mp, isdp->id_unit); 443 INTREN(isdp->id_irq); 444 } 445 } else { 446 if (isdp->id_reconfig) { 447 (*dp->attach)(isdp); /* reconfiguration attach */ 448 } 449 if (!last_alive) { 450 if (!isdp->id_reconfig) { 451 printf("%s%d not found", 452 dp->name, isdp->id_unit); 453 if (isdp->id_iobase) { 454 printf(" at 0x%x", isdp->id_iobase); 455 } 456 printf("\n"); 457 } 458 } 459 else { 460 /* This code has not been tested.... */ 461 if (isdp->id_irq) { 462 INTRDIS(isdp->id_irq); 463 unregister_intr(ffs(isdp->id_irq) - 1, 464 isdp->id_intr); 465 if (mp) 466 INTRUNMASK(*mp, isdp->id_irq); 467 } 468 } 469 } 470} 471 472/* 473 * Fill in default interrupt table (in case of spuruious interrupt 474 * during configuration of kernel, setup interrupt control unit 475 */ 476void 477isa_defaultirq() 478{ 479 int i; 480 481 /* icu vectors */ 482 for (i = 0; i < ICU_LEN; i++) 483 unregister_intr(i, (inthand2_t *)NULL); 484 485 /* initialize 8259's */ 486 outb(IO_ICU1, 0x11); /* reset; program device, four bytes */ 487 outb(IO_ICU1+1, NRSVIDT); /* starting at this vector index */ 488 outb(IO_ICU1+1, 1<<2); /* slave on line 2 */ 489#ifdef AUTO_EOI_1 490 outb(IO_ICU1+1, 2 | 1); /* auto EOI, 8086 mode */ 491#else 492 outb(IO_ICU1+1, 1); /* 8086 mode */ 493#endif 494 outb(IO_ICU1+1, 0xff); /* leave interrupts masked */ 495 outb(IO_ICU1, 0x0a); /* default to IRR on read */ 496 outb(IO_ICU1, 0xc0 | (3 - 1)); /* pri order 3-7, 0-2 (com2 first) */ 497 498 outb(IO_ICU2, 0x11); /* reset; program device, four bytes */ 499 outb(IO_ICU2+1, NRSVIDT+8); /* staring at this vector index */ 500 outb(IO_ICU2+1,2); /* my slave id is 2 */ 501#ifdef AUTO_EOI_2 502 outb(IO_ICU2+1, 2 | 1); /* auto EOI, 8086 mode */ 503#else 504 outb(IO_ICU2+1,1); /* 8086 mode */ 505#endif 506 outb(IO_ICU2+1, 0xff); /* leave interrupts masked */ 507 outb(IO_ICU2, 0x0a); /* default to IRR on read */ 508} 509 510static caddr_t dma_bouncebuf[8]; 511static u_int dma_bouncebufsize[8]; 512static u_int8_t dma_bounced = 0; 513static u_int8_t dma_busy = 0; /* Used in isa_dmastart() */ 514static u_int8_t dma_inuse = 0; /* User for acquire/release */ 515 516#define VALID_DMA_MASK (7) 517 518/* high byte of address is stored in this port for i-th dma channel */ 519static short dmapageport[8] = 520 { 0x87, 0x83, 0x81, 0x82, 0x8f, 0x8b, 0x89, 0x8a }; 521 522/* 523 * Setup a DMA channel's bounce buffer. 524 */ 525void 526isa_dmainit(chan, bouncebufsize) 527 int chan; 528 u_int bouncebufsize; 529{ 530 void *buf; 531 532#ifdef DIAGNOSTIC 533 if (chan & ~VALID_DMA_MASK) 534 panic("isa_dmainit: channel out of range"); 535 536 if (dma_bouncebuf[chan] != NULL) 537 panic("isa_dmainit: impossible request"); 538#endif 539 540 dma_bouncebufsize[chan] = bouncebufsize; 541 542 /* Try malloc() first. It works better if it works. */ 543 buf = malloc(bouncebufsize, M_DEVBUF, M_NOWAIT); 544 if (buf != NULL) { 545 if (isa_dmarangecheck(buf, bouncebufsize, chan) == 0) { 546 dma_bouncebuf[chan] = buf; 547 return; 548 } 549 free(buf, M_DEVBUF); 550 } 551 buf = contigmalloc(bouncebufsize, M_DEVBUF, M_NOWAIT, 0ul, 0xfffffful, 552 1ul, chan & 4 ? 0x20000ul : 0x10000ul); 553 if (buf == NULL) 554 printf("isa_dmainit(%d, %d) failed\n", chan, bouncebufsize); 555 else 556 dma_bouncebuf[chan] = buf; 557} 558 559/* 560 * Register a DMA channel's usage. Usually called from a device driver 561 * in open() or during it's initialization. 562 */ 563int 564isa_dma_acquire(chan) 565 int chan; 566{ 567#ifdef DIAGNOSTIC 568 if (chan & ~VALID_DMA_MASK) 569 panic("isa_dma_acquire: channel out of range"); 570#endif 571 572 if (dma_inuse & (1 << chan)) { 573 printf("isa_dma_acquire: channel %d already in use\n", chan); 574 return (EBUSY); 575 } 576 dma_inuse |= (1 << chan); 577 578 return (0); 579} 580 581/* 582 * Unregister a DMA channel's usage. Usually called from a device driver 583 * during close() or during it's shutdown. 584 */ 585void 586isa_dma_release(chan) 587 int chan; 588{ 589#ifdef DIAGNOSTIC 590 if (chan & ~VALID_DMA_MASK) 591 panic("isa_dma_release: channel out of range"); 592 593 if (dma_inuse & (1 << chan) == 0) 594 printf("isa_dma_release: channel %d not in use\n", chan); 595#endif 596 597 if (dma_busy & (1 << chan)) { 598 dma_busy &= ~(1 << chan); 599 /* 600 * XXX We should also do "dma_bounced &= (1 << chan);" 601 * because we are acting on behalf of isa_dmadone() which 602 * was not called to end the last DMA operation. This does 603 * not matter now, but it may in the future. 604 */ 605 } 606 607 dma_inuse &= ~(1 << chan); 608} 609 610/* 611 * isa_dmacascade(): program 8237 DMA controller channel to accept 612 * external dma control by a board. 613 */ 614void isa_dmacascade(chan) 615 int chan; 616{ 617#ifdef DIAGNOSTIC 618 if (chan & ~VALID_DMA_MASK) 619 panic("isa_dmacascade: channel out of range"); 620#endif 621 622 /* set dma channel mode, and set dma channel mode */ 623 if ((chan & 4) == 0) { 624 outb(DMA1_MODE, DMA37MD_CASCADE | chan); 625 outb(DMA1_SMSK, chan); 626 } else { 627 outb(DMA2_MODE, DMA37MD_CASCADE | (chan & 3)); 628 outb(DMA2_SMSK, chan & 3); 629 } 630} 631 632/* 633 * isa_dmastart(): program 8237 DMA controller channel, avoid page alignment 634 * problems by using a bounce buffer. 635 */ 636void isa_dmastart(int flags, caddr_t addr, u_int nbytes, int chan) 637{ 638 vm_offset_t phys; 639 int waport; 640 caddr_t newaddr; 641 642#ifdef DIAGNOSTIC 643 if (chan & ~VALID_DMA_MASK) 644 panic("isa_dmastart: channel out of range"); 645 646 if ((chan < 4 && nbytes > (1<<16)) 647 || (chan >= 4 && (nbytes > (1<<17) || (u_int)addr & 1))) 648 panic("isa_dmastart: impossible request"); 649 650 if (dma_inuse & (1 << chan) == 0) 651 printf("isa_dmastart: channel %d not acquired\n", chan); 652#endif 653 654 if (dma_busy & (1 << chan)) 655 printf("isa_dmastart: channel %d busy\n", chan); 656 657 dma_busy |= (1 << chan); 658 659 if (isa_dmarangecheck(addr, nbytes, chan)) { 660 if (dma_bouncebuf[chan] == NULL 661 || dma_bouncebufsize[chan] < nbytes) 662 panic("isa_dmastart: bad bounce buffer"); 663 dma_bounced |= (1 << chan); 664 newaddr = dma_bouncebuf[chan]; 665 666 /* copy bounce buffer on write */ 667 if (!(flags & B_READ)) 668 bcopy(addr, newaddr, nbytes); 669 addr = newaddr; 670 } 671 672 /* translate to physical */ 673 phys = pmap_extract(pmap_kernel(), (vm_offset_t)addr); 674 675 if ((chan & 4) == 0) { 676 /* 677 * Program one of DMA channels 0..3. These are 678 * byte mode channels. 679 */ 680 /* set dma channel mode, and reset address ff */ 681 682 /* If B_RAW flag is set, then use autoinitialise mode */ 683 if (flags & B_RAW) { 684 if (flags & B_READ) 685 outb(DMA1_MODE, DMA37MD_AUTO|DMA37MD_WRITE|chan); 686 else 687 outb(DMA1_MODE, DMA37MD_AUTO|DMA37MD_READ|chan); 688 } 689 else 690 if (flags & B_READ) 691 outb(DMA1_MODE, DMA37MD_SINGLE|DMA37MD_WRITE|chan); 692 else 693 outb(DMA1_MODE, DMA37MD_SINGLE|DMA37MD_READ|chan); 694 outb(DMA1_FFC, 0); 695 696 /* send start address */ 697 waport = DMA1_CHN(chan); 698 outb(waport, phys); 699 outb(waport, phys>>8); 700 outb(dmapageport[chan], phys>>16); 701 702 /* send count */ 703 outb(waport + 1, --nbytes); 704 outb(waport + 1, nbytes>>8); 705 706 /* unmask channel */ 707 outb(DMA1_SMSK, chan); 708 } else { 709 /* 710 * Program one of DMA channels 4..7. These are 711 * word mode channels. 712 */ 713 /* set dma channel mode, and reset address ff */ 714 715 /* If B_RAW flag is set, then use autoinitialise mode */ 716 if (flags & B_RAW) { 717 if (flags & B_READ) 718 outb(DMA2_MODE, DMA37MD_AUTO|DMA37MD_WRITE|(chan&3)); 719 else 720 outb(DMA2_MODE, DMA37MD_AUTO|DMA37MD_READ|(chan&3)); 721 } 722 else 723 if (flags & B_READ) 724 outb(DMA2_MODE, DMA37MD_SINGLE|DMA37MD_WRITE|(chan&3)); 725 else 726 outb(DMA2_MODE, DMA37MD_SINGLE|DMA37MD_READ|(chan&3)); 727 outb(DMA2_FFC, 0); 728 729 /* send start address */ 730 waport = DMA2_CHN(chan - 4); 731 outb(waport, phys>>1); 732 outb(waport, phys>>9); 733 outb(dmapageport[chan], phys>>16); 734 735 /* send count */ 736 nbytes >>= 1; 737 outb(waport + 2, --nbytes); 738 outb(waport + 2, nbytes>>8); 739 740 /* unmask channel */ 741 outb(DMA2_SMSK, chan & 3); 742 } 743} 744 745void isa_dmadone(int flags, caddr_t addr, int nbytes, int chan) 746{ 747#ifdef DIAGNOSTIC 748 if (chan & ~VALID_DMA_MASK) 749 panic("isa_dmadone: channel out of range"); 750 751 if (dma_inuse & (1 << chan) == 0) 752 printf("isa_dmadone: channel %d not acquired\n", chan); 753#endif 754 755#if 0 756 /* 757 * XXX This should be checked, but drivers like ad1848 only call 758 * isa_dmastart() once because they use Auto DMA mode. If we 759 * leave this in, drivers that do this will print this continuously. 760 */ 761 if (dma_busy & (1 << chan) == 0) 762 printf("isa_dmadone: channel %d not busy\n", chan); 763#endif 764 765 if (dma_bounced & (1 << chan)) { 766 /* copy bounce buffer on read */ 767 if (flags & B_READ) 768 bcopy(dma_bouncebuf[chan], addr, nbytes); 769 770 dma_bounced &= ~(1 << chan); 771 } 772 dma_busy &= ~(1 << chan); 773} 774 775/* 776 * Check for problems with the address range of a DMA transfer 777 * (non-contiguous physical pages, outside of bus address space, 778 * crossing DMA page boundaries). 779 * Return true if special handling needed. 780 */ 781 782static int 783isa_dmarangecheck(caddr_t va, u_int length, int chan) { 784 vm_offset_t phys, priorpage = 0, endva; 785 u_int dma_pgmsk = (chan & 4) ? ~(128*1024-1) : ~(64*1024-1); 786 787 endva = (vm_offset_t)round_page(va + length); 788 for (; va < (caddr_t) endva ; va += PAGE_SIZE) { 789 phys = trunc_page(pmap_extract(pmap_kernel(), (vm_offset_t)va)); 790#define ISARAM_END RAM_END 791 if (phys == 0) 792 panic("isa_dmacheck: no physical page present"); 793 if (phys >= ISARAM_END) 794 return (1); 795 if (priorpage) { 796 if (priorpage + PAGE_SIZE != phys) 797 return (1); 798 /* check if crossing a DMA page boundary */ 799 if (((u_int)priorpage ^ (u_int)phys) & dma_pgmsk) 800 return (1); 801 } 802 priorpage = phys; 803 } 804 return (0); 805} 806 807#define NMI_PARITY (1 << 7) 808#define NMI_IOCHAN (1 << 6) 809#define ENMI_WATCHDOG (1 << 7) 810#define ENMI_BUSTIMER (1 << 6) 811#define ENMI_IOSTATUS (1 << 5) 812 813/* 814 * Handle a NMI, possibly a machine check. 815 * return true to panic system, false to ignore. 816 */ 817int 818isa_nmi(cd) 819 int cd; 820{ 821 int isa_port = inb(0x61); 822 int eisa_port = inb(0x461); 823 if(isa_port & NMI_PARITY) { 824 panic("RAM parity error, likely hardware failure."); 825 } else if(isa_port & NMI_IOCHAN) { 826 panic("I/O channel check, likely hardware failure."); 827 } else if(eisa_port & ENMI_WATCHDOG) { 828 panic("EISA watchdog timer expired, likely hardware failure."); 829 } else if(eisa_port & ENMI_BUSTIMER) { 830 panic("EISA bus timeout, likely hardware failure."); 831 } else if(eisa_port & ENMI_IOSTATUS) { 832 panic("EISA I/O port status error."); 833 } else { 834 printf("\nNMI ISA %x, EISA %x\n", isa_port, eisa_port); 835 return(0); 836 } 837} 838 839/* 840 * Caught a stray interrupt, notify 841 */ 842static void 843isa_strayintr(d) 844 int d; 845{ 846 847 /* DON'T BOTHER FOR NOW! */ 848 /* for some reason, we get bursts of intr #7, even if not enabled! */ 849 /* 850 * Well the reason you got bursts of intr #7 is because someone 851 * raised an interrupt line and dropped it before the 8259 could 852 * prioritize it. This is documented in the intel data book. This 853 * means you have BAD hardware! I have changed this so that only 854 * the first 5 get logged, then it quits logging them, and puts 855 * out a special message. rgrimes 3/25/1993 856 */ 857 /* 858 * XXX TODO print a different message for #7 if it is for a 859 * glitch. Glitches can be distinguished from real #7's by 860 * testing that the in-service bit is _not_ set. The test 861 * must be done before sending an EOI so it can't be done if 862 * we are using AUTO_EOI_1. 863 */ 864 if (intrcnt[NR_DEVICES + d] <= 5) 865 log(LOG_ERR, "stray irq %d\n", d); 866 if (intrcnt[NR_DEVICES + d] == 5) 867 log(LOG_CRIT, 868 "too many stray irq %d's; not logging any more\n", d); 869} 870 871/* 872 * Find the highest priority enabled display device. Since we can't 873 * distinguish display devices from ttys, depend on display devices 874 * being sensitive and before sensitive non-display devices (if any) 875 * in isa_devtab_tty. 876 * 877 * XXX we should add capability flags IAMDISPLAY and ISUPPORTCONSOLES. 878 */ 879struct isa_device * 880find_display() 881{ 882 struct isa_device *dvp; 883 884 for (dvp = isa_devtab_tty; dvp->id_driver != NULL; dvp++) 885 if (dvp->id_driver->sensitive_hw && dvp->id_enabled) 886 return (dvp); 887 return (NULL); 888} 889 890/* 891 * find an ISA device in a given isa_devtab_* table, given 892 * the table to search, the expected id_driver entry, and the unit number. 893 * 894 * this function is defined in isa_device.h, and this location is debatable; 895 * i put it there because it's useless w/o, and directly operates on 896 * the other stuff in that file. 897 * 898 */ 899 900struct isa_device *find_isadev(table, driverp, unit) 901 struct isa_device *table; 902 struct isa_driver *driverp; 903 int unit; 904{ 905 if (driverp == NULL) /* sanity check */ 906 return NULL; 907 908 while ((table->id_driver != driverp) || (table->id_unit != unit)) { 909 if (table->id_driver == 0) 910 return NULL; 911 912 table++; 913 } 914 915 return table; 916} 917 918/* 919 * Return nonzero if a (masked) irq is pending for a given device. 920 */ 921int 922isa_irq_pending(dvp) 923 struct isa_device *dvp; 924{ 925 unsigned id_irq; 926 927 id_irq = dvp->id_irq; 928 if (id_irq & 0xff) 929 return (inb(IO_ICU1) & id_irq); 930 return (inb(IO_ICU2) & (id_irq >> 8)); 931} 932 933int 934update_intr_masks(void) 935{ 936 int intr, n=0; 937 u_int mask,*maskptr; 938 939 for (intr=0; intr < ICU_LEN; intr ++) { 940 if (intr==2) continue; 941 maskptr = intr_mptr[intr]; 942 if (!maskptr) continue; 943 *maskptr |= 1 << intr; 944 mask = *maskptr; 945 if (mask != intr_mask[intr]) { 946#if 0 947 printf ("intr_mask[%2d] old=%08x new=%08x ptr=%p.\n", 948 intr, intr_mask[intr], mask, maskptr); 949#endif 950 intr_mask[intr]=mask; 951 n++; 952 } 953 954 } 955 return (n); 956} 957 958int 959register_intr(intr, device_id, flags, handler, maskptr, unit) 960 int intr; 961 int device_id; 962 u_int flags; 963 inthand2_t *handler; 964 u_int *maskptr; 965 int unit; 966{ 967 char *cp; 968 u_long ef; 969 int id; 970 u_int mask = (maskptr ? *maskptr : 0); 971 972 if ((u_int)intr >= ICU_LEN || intr == 2 973 || (u_int)device_id >= NR_DEVICES) 974 return (EINVAL); 975 if (intr_handler[intr] != isa_strayintr) 976 return (EBUSY); 977 ef = read_eflags(); 978 disable_intr(); 979 intr_countp[intr] = &intrcnt[device_id]; 980 intr_handler[intr] = handler; 981 intr_mptr[intr] = maskptr; 982 intr_mask[intr] = mask | (1 << intr); 983 intr_unit[intr] = unit; 984 setidt(ICU_OFFSET + intr, 985 flags & RI_FAST ? fastintr[intr] : slowintr[intr], 986 SDT_SYS386IGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 987 write_eflags(ef); 988 for (cp = intrnames, id = 0; id <= device_id; id++) 989 while (*cp++ != '\0') 990 ; 991 if (cp > eintrnames) 992 return (0); 993 if (intr < 10) { 994 cp[-3] = intr + '0'; 995 cp[-2] = ' '; 996 } else { 997 cp[-3] = '1'; 998 cp[-2] = intr - 10 + '0'; 999 } 1000 return (0); 1001} 1002 1003static void 1004register_imask(dvp, mask) 1005 struct isa_device *dvp; 1006 u_int mask; 1007{ 1008 if (dvp->id_alive && dvp->id_irq) { 1009 int intr; 1010 1011 intr = ffs(dvp->id_irq) - 1; 1012 intr_mask[intr] = mask | (1 <<intr); 1013 } 1014 (void) update_intr_masks(); 1015} 1016 1017int 1018unregister_intr(intr, handler) 1019 int intr; 1020 inthand2_t *handler; 1021{ 1022 u_long ef; 1023 1024 if ((u_int)intr >= ICU_LEN || handler != intr_handler[intr]) 1025 return (EINVAL); 1026 ef = read_eflags(); 1027 disable_intr(); 1028 intr_countp[intr] = &intrcnt[NR_DEVICES + intr]; 1029 intr_handler[intr] = isa_strayintr; 1030 intr_mptr[intr] = NULL; 1031 intr_mask[intr] = HWI_MASK | SWI_MASK; 1032 intr_unit[intr] = intr; 1033 setidt(ICU_OFFSET + intr, slowintr[intr], SDT_SYS386IGT, SEL_KPL, 1034 GSEL(GCODE_SEL, SEL_KPL)); 1035 write_eflags(ef); 1036 return (0); 1037} 1038