isa.c revision 26949
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 1.2 1997/06/25 20:12:23 smp Exp smp $ 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 <sys/param.h> 51#include <sys/systm.h> 52#include <sys/buf.h> 53#include <sys/syslog.h> 54#include <sys/malloc.h> 55#include <machine/ipl.h> 56#include <machine/md_var.h> 57#include <machine/segments.h> 58#ifdef APIC_IO 59#include <machine/smp.h> 60#include <machine/apic.h> 61#endif /* APIC_IO */ 62#include <vm/vm.h> 63#include <vm/vm_param.h> 64#include <vm/pmap.h> 65#include <i386/isa/isa_device.h> 66#include <i386/isa/intr_machdep.h> 67#include <i386/isa/isa.h> 68#include <i386/isa/icu.h> 69#include <i386/isa/ic/i8237.h> 70#include "vector.h" 71 72#include <sys/interrupt.h> 73 74/* 75** Register definitions for DMA controller 1 (channels 0..3): 76*/ 77#define DMA1_CHN(c) (IO_DMA1 + 1*(2*(c))) /* addr reg for channel c */ 78#define DMA1_SMSK (IO_DMA1 + 1*10) /* single mask register */ 79#define DMA1_MODE (IO_DMA1 + 1*11) /* mode register */ 80#define DMA1_FFC (IO_DMA1 + 1*12) /* clear first/last FF */ 81 82/* 83** Register definitions for DMA controller 2 (channels 4..7): 84*/ 85#define DMA2_CHN(c) (IO_DMA2 + 2*(2*(c))) /* addr reg for channel c */ 86#define DMA2_SMSK (IO_DMA2 + 2*10) /* single mask register */ 87#define DMA2_MODE (IO_DMA2 + 2*11) /* mode register */ 88#define DMA2_FFC (IO_DMA2 + 2*12) /* clear first/last FF */ 89 90static void config_isadev __P((struct isa_device *isdp, u_int *mp)); 91static void config_isadev_c __P((struct isa_device *isdp, u_int *mp, 92 int reconfig)); 93static void conflict __P((struct isa_device *dvp, struct isa_device *tmpdvp, 94 int item, char const *whatnot, char const *reason, 95 char const *format)); 96static int haveseen __P((struct isa_device *dvp, struct isa_device *tmpdvp, 97 u_int checkbits)); 98static int isa_dmarangecheck __P((caddr_t va, u_int length, int chan)); 99 100/* 101 * print a conflict message 102 */ 103static void 104conflict(dvp, tmpdvp, item, whatnot, reason, format) 105 struct isa_device *dvp; 106 struct isa_device *tmpdvp; 107 int item; 108 char const *whatnot; 109 char const *reason; 110 char const *format; 111{ 112 printf("%s%d not %sed due to %s conflict with %s%d at ", 113 dvp->id_driver->name, dvp->id_unit, whatnot, reason, 114 tmpdvp->id_driver->name, tmpdvp->id_unit); 115 printf(format, item); 116 printf("\n"); 117} 118 119/* 120 * Check to see if things are already in use, like IRQ's, I/O addresses 121 * and Memory addresses. 122 */ 123static int 124haveseen(dvp, tmpdvp, checkbits) 125 struct isa_device *dvp; 126 struct isa_device *tmpdvp; 127 u_int checkbits; 128{ 129 /* 130 * Only check against devices that have already been found and are not 131 * unilaterally allowed to conflict anyway. 132 */ 133 if (tmpdvp->id_alive && !dvp->id_conflicts) { 134 char const *whatnot; 135 136 whatnot = checkbits & CC_ATTACH ? "attach" : "prob"; 137 /* 138 * Check for I/O address conflict. We can only check the 139 * starting address of the device against the range of the 140 * device that has already been probed since we do not 141 * know how many I/O addresses this device uses. 142 */ 143 if (checkbits & CC_IOADDR && tmpdvp->id_alive != -1) { 144 if ((dvp->id_iobase >= tmpdvp->id_iobase) && 145 (dvp->id_iobase <= 146 (tmpdvp->id_iobase + tmpdvp->id_alive - 1))) { 147 conflict(dvp, tmpdvp, dvp->id_iobase, whatnot, 148 "I/O address", "0x%x"); 149 return 1; 150 } 151 } 152 /* 153 * Check for Memory address conflict. We can check for 154 * range overlap, but it will not catch all cases since the 155 * driver may adjust the msize paramater during probe, for 156 * now we just check that the starting address does not 157 * fall within any allocated region. 158 * XXX could add a second check after the probe for overlap, 159 * since at that time we would know the full range. 160 * XXX KERNBASE is a hack, we should have vaddr in the table! 161 */ 162 if (checkbits & CC_MEMADDR && tmpdvp->id_maddr) { 163 if ((KERNBASE + dvp->id_maddr >= tmpdvp->id_maddr) && 164 (KERNBASE + dvp->id_maddr <= 165 (tmpdvp->id_maddr + tmpdvp->id_msize - 1))) { 166 conflict(dvp, tmpdvp, (int)dvp->id_maddr, 167 whatnot, "maddr", "0x%x"); 168 return 1; 169 } 170 } 171 /* 172 * Check for IRQ conflicts. 173 */ 174 if (checkbits & CC_IRQ && tmpdvp->id_irq) { 175 if (tmpdvp->id_irq == dvp->id_irq) { 176 conflict(dvp, tmpdvp, ffs(dvp->id_irq) - 1, 177 whatnot, "irq", "%d"); 178 return 1; 179 } 180 } 181 /* 182 * Check for DRQ conflicts. 183 */ 184 if (checkbits & CC_DRQ && tmpdvp->id_drq != -1) { 185 if (tmpdvp->id_drq == dvp->id_drq) { 186 conflict(dvp, tmpdvp, dvp->id_drq, whatnot, 187 "drq", "%d"); 188 return 1; 189 } 190 } 191 } 192 return 0; 193} 194 195#ifdef RESOURCE_CHECK 196#include <sys/drvresource.h> 197 198static int 199checkone (struct isa_device *dvp, int type, addr_t low, addr_t high, 200 char *resname, char *resfmt, int attaching) 201{ 202 int result = 0; 203 if (bootverbose) { 204 if (low == high) 205 printf("\tcheck %s: 0x%x\n", resname, low); 206 else 207 printf("\tcheck %s: 0x%x to 0x%x\n", 208 resname, low, high); 209 } 210 if (resource_check(type, RESF_NONE, low, high) != NULL) { 211 char *whatnot = attaching ? "attach" : "prob"; 212 static struct isa_device dummydev; 213 static struct isa_driver dummydrv; 214 struct isa_device *tmpdvp = &dummydev; 215 216 dummydev.id_driver = &dummydrv; 217 dummydev.id_unit = 0; 218 dummydrv.name = "pci"; 219 conflict(dvp, tmpdvp, low, whatnot, resname, resfmt); 220 result = 1; 221 } else if (attaching) { 222 if (low == high) 223 printf("\tregister %s: 0x%x\n", resname, low); 224 else 225 printf("\tregister %s: 0x%x to 0x%x\n", 226 resname, low, high); 227 resource_claim(dvp, type, RESF_NONE, low, high); 228 } 229 return (result); 230} 231 232static int 233check_pciconflict(struct isa_device *dvp, int checkbits) 234{ 235 int result = 0; 236 int attaching = (checkbits & CC_ATTACH) != 0; 237 238 if (checkbits & CC_MEMADDR) { 239 long maddr = dvp->id_maddr; 240 long msize = dvp->id_msize; 241 if (msize > 0) { 242 if (checkone(dvp, REST_MEM, maddr, maddr + msize - 1, 243 "maddr", "0x%x", attaching) != 0) { 244 result = 1; 245 attaching = 0; 246 } 247 } 248 } 249 if (checkbits & CC_IOADDR) { 250 unsigned iobase = dvp->id_iobase; 251 unsigned iosize = dvp->id_alive; 252 if (iosize == -1) 253 iosize = 1; /* XXX can't do much about this ... */ 254 if (iosize > 0) { 255 if (checkone(dvp, REST_PORT, iobase, iobase + iosize -1, 256 "I/O address", "0x%x", attaching) != 0) { 257 result = 1; 258 attaching = 0; 259 } 260 } 261 } 262 if (checkbits & CC_IRQ) { 263 int irq = ffs(dvp->id_irq) - 1; 264 if (irq >= 0) { 265 if (checkone(dvp, REST_INT, irq, irq, 266 "irq", "%d", attaching) != 0) { 267 result = 1; 268 attaching = 0; 269 } 270 } 271 } 272 if (checkbits & CC_DRQ) { 273 int drq = dvp->id_drq; 274 if (drq >= 0) { 275 if (checkone(dvp, REST_DMA, drq, drq, 276 "drq", "%d", attaching) != 0) { 277 result = 1; 278 attaching = 0; 279 } 280 } 281 } 282 if (result != 0) 283 resource_free (dvp); 284 return (result); 285} 286#endif /* RESOURCE_CHECK */ 287 288/* 289 * Search through all the isa_devtab_* tables looking for anything that 290 * conflicts with the current device. 291 */ 292int 293haveseen_isadev(dvp, checkbits) 294 struct isa_device *dvp; 295 u_int checkbits; 296{ 297 struct isa_device *tmpdvp; 298 int status = 0; 299 300 for (tmpdvp = isa_devtab_tty; tmpdvp->id_driver; tmpdvp++) { 301 status |= haveseen(dvp, tmpdvp, checkbits); 302 if (status) 303 return status; 304 } 305 for (tmpdvp = isa_devtab_bio; tmpdvp->id_driver; tmpdvp++) { 306 status |= haveseen(dvp, tmpdvp, checkbits); 307 if (status) 308 return status; 309 } 310 for (tmpdvp = isa_devtab_net; tmpdvp->id_driver; tmpdvp++) { 311 status |= haveseen(dvp, tmpdvp, checkbits); 312 if (status) 313 return status; 314 } 315 for (tmpdvp = isa_devtab_null; tmpdvp->id_driver; tmpdvp++) { 316 status |= haveseen(dvp, tmpdvp, checkbits); 317 if (status) 318 return status; 319 } 320#ifdef RESOURCE_CHECK 321 if (!dvp->id_conflicts) { 322 status = check_pciconflict(dvp, checkbits); 323 } else if (bootverbose) 324 printf("\tnot checking for resource conflicts ...\n"); 325 } 326#endif /* RESOURCE_CHECK */ 327 return(status); 328} 329 330/* 331 * Configure all ISA devices 332 */ 333void 334isa_configure() { 335 struct isa_device *dvp; 336 337 splhigh(); 338 printf("Probing for devices on the ISA bus:\n"); 339 /* First probe all the sensitive probes */ 340 for (dvp = isa_devtab_tty; dvp->id_driver; dvp++) 341 if (dvp->id_driver->sensitive_hw) 342 config_isadev(dvp, &tty_imask); 343 for (dvp = isa_devtab_bio; dvp->id_driver; dvp++) 344 if (dvp->id_driver->sensitive_hw) 345 config_isadev(dvp, &bio_imask); 346 for (dvp = isa_devtab_net; dvp->id_driver; dvp++) 347 if (dvp->id_driver->sensitive_hw) 348 config_isadev(dvp, &net_imask); 349 for (dvp = isa_devtab_null; dvp->id_driver; dvp++) 350 if (dvp->id_driver->sensitive_hw) 351 config_isadev(dvp, (u_int *)NULL); 352 353 /* Then all the bad ones */ 354 for (dvp = isa_devtab_tty; dvp->id_driver; dvp++) 355 if (!dvp->id_driver->sensitive_hw) 356 config_isadev(dvp, &tty_imask); 357 for (dvp = isa_devtab_bio; dvp->id_driver; dvp++) 358 if (!dvp->id_driver->sensitive_hw) 359 config_isadev(dvp, &bio_imask); 360 for (dvp = isa_devtab_net; dvp->id_driver; dvp++) 361 if (!dvp->id_driver->sensitive_hw) 362 config_isadev(dvp, &net_imask); 363 for (dvp = isa_devtab_null; dvp->id_driver; dvp++) 364 if (!dvp->id_driver->sensitive_hw) 365 config_isadev(dvp, (u_int *)NULL); 366 367 bio_imask |= SWI_CLOCK_MASK; 368 net_imask |= SWI_NET_MASK; 369 tty_imask |= SWI_TTY_MASK; 370 371/* 372 * XXX we should really add the tty device to net_imask when the line is 373 * switched to SLIPDISC, and then remove it when it is switched away from 374 * SLIPDISC. No need to block out ALL ttys during a splimp when only one 375 * of them is running slip. 376 * 377 * XXX actually, blocking all ttys during a splimp doesn't matter so much 378 * with sio because the serial interrupt layer doesn't use tty_imask. Only 379 * non-serial ttys suffer. It's more stupid that ALL 'net's are blocked 380 * during spltty. 381 */ 382#include "sl.h" 383#if NSL > 0 384 net_imask |= tty_imask; 385 tty_imask = net_imask; 386#endif 387 388 /* bio_imask |= tty_imask ; can some tty devices use buffers? */ 389 390 if (bootverbose) 391 printf("imasks: bio %x, tty %x, net %x\n", 392 bio_imask, tty_imask, net_imask); 393 394 /* 395 * Finish initializing intr_mask[]. Note that the partly 396 * constructed masks aren't actually used since we're at splhigh. 397 * For fully dynamic initialization, register_intr() and 398 * icu_unset() will have to adjust the masks for _all_ 399 * interrupts and for tty_imask, etc. 400 */ 401 for (dvp = isa_devtab_tty; dvp->id_driver; dvp++) 402 register_imask(dvp, tty_imask); 403 for (dvp = isa_devtab_bio; dvp->id_driver; dvp++) 404 register_imask(dvp, bio_imask); 405 for (dvp = isa_devtab_net; dvp->id_driver; dvp++) 406 register_imask(dvp, net_imask); 407 for (dvp = isa_devtab_null; dvp->id_driver; dvp++) 408 register_imask(dvp, SWI_CLOCK_MASK); 409 spl0(); 410} 411 412/* 413 * Configure an ISA device. 414 */ 415 416 417static void 418config_isadev(isdp, mp) 419 struct isa_device *isdp; 420 u_int *mp; 421{ 422 config_isadev_c(isdp, mp, 0); 423} 424 425void 426reconfig_isadev(isdp, mp) 427 struct isa_device *isdp; 428 u_int *mp; 429{ 430 config_isadev_c(isdp, mp, 1); 431} 432 433static void 434config_isadev_c(isdp, mp, reconfig) 435 struct isa_device *isdp; 436 u_int *mp; 437 int reconfig; 438{ 439 u_int checkbits; 440 int id_alive; 441 int last_alive; 442 struct isa_driver *dp = isdp->id_driver; 443 444 if (!isdp->id_enabled) { 445 printf("%s%d: disabled, not probed.\n", 446 dp->name, isdp->id_unit); 447 return; 448 } 449 checkbits = CC_DRQ | CC_IOADDR | CC_MEMADDR; 450 if (!reconfig && haveseen_isadev(isdp, checkbits)) 451 return; 452 if (!reconfig && isdp->id_maddr) { 453 isdp->id_maddr -= ISA_HOLE_START; 454 isdp->id_maddr += atdevbase; 455 } 456 if (reconfig) { 457 last_alive = isdp->id_alive; 458 isdp->id_reconfig = 1; 459 } 460 else { 461 last_alive = 0; 462 isdp->id_reconfig = 0; 463 } 464 id_alive = (*dp->probe)(isdp); 465 if (id_alive) { 466 /* 467 * Only print the I/O address range if id_alive != -1 468 * Right now this is a temporary fix just for the new 469 * NPX code so that if it finds a 486 that can use trap 470 * 16 it will not report I/O addresses. 471 * Rod Grimes 04/26/94 472 */ 473 if (!isdp->id_reconfig) { 474 printf("%s%d", dp->name, isdp->id_unit); 475 if (id_alive != -1) { 476 if (isdp->id_iobase == -1) 477 printf(" at ?"); 478 else { 479 printf(" at 0x%x", isdp->id_iobase); 480 if (isdp->id_iobase + id_alive - 1 != 481 isdp->id_iobase) { 482 printf("-0x%x", 483 isdp->id_iobase + id_alive - 1); 484 } 485 } 486 } 487 if (isdp->id_irq) 488 printf(" irq %d", ffs(isdp->id_irq) - 1); 489 if (isdp->id_drq != -1) 490 printf(" drq %d", isdp->id_drq); 491 if (isdp->id_maddr) 492 printf(" maddr 0x%lx", kvtop(isdp->id_maddr)); 493 if (isdp->id_msize) 494 printf(" msize %d", isdp->id_msize); 495 if (isdp->id_flags) 496 printf(" flags 0x%x", isdp->id_flags); 497 if (isdp->id_iobase && !(isdp->id_iobase & 0xf300)) { 498 printf(" on motherboard"); 499 } else if (isdp->id_iobase >= 0x1000 && 500 !(isdp->id_iobase & 0x300)) { 501 printf (" on eisa slot %d", 502 isdp->id_iobase >> 12); 503 } else { 504 printf (" on isa"); 505 } 506 printf("\n"); 507 /* 508 * Check for conflicts again. The driver may have 509 * changed *dvp. We should weaken the early check 510 * since the driver may have been able to change 511 * *dvp to avoid conflicts if given a chance. We 512 * already skip the early check for IRQs and force 513 * a check for IRQs in the next group of checks. 514 */ 515 checkbits |= CC_IRQ; 516 if (haveseen_isadev(isdp, checkbits)) { 517 return; 518 } 519 isdp->id_alive = id_alive; 520 } 521 (*dp->attach)(isdp); 522 if (isdp->id_irq) { 523#ifdef APIC_IO 524 /* 525 * Some motherboards use upper IRQs for traditional 526 * ISA INTerrupt sources. In particular we have 527 * seen the secondary IDE connected to IRQ20. 528 * This code detects and fixes this situation. 529 */ 530 u_int apic_mask; 531 int rirq; 532 533 apic_mask = isa_apic_mask(isdp->id_irq); 534 if (apic_mask != isdp->id_irq) { 535 rirq = ffs(isdp->id_irq) - 1; 536 isdp->id_irq = apic_mask; 537 undirect_isa_irq(rirq); /* free for ISA */ 538 } 539#endif /* APIC_IO */ 540 if (!isdp->id_conflicts 541 || (!intr_registered(ffs(isdp->id_irq) - 1) 542 && isdp->id_intr != NULL)) 543 register_intr(ffs(isdp->id_irq) - 1, 544 isdp->id_id, 545 isdp->id_ri_flags, 546 isdp->id_intr, 547 mp, isdp->id_unit); 548 } 549 } else { 550 if (isdp->id_reconfig) { 551 (*dp->attach)(isdp); /* reconfiguration attach */ 552 } 553 if (!last_alive) { 554 if (!isdp->id_reconfig) { 555 printf("%s%d not found", 556 dp->name, isdp->id_unit); 557 if (isdp->id_iobase != -1) 558 printf(" at 0x%x", isdp->id_iobase); 559 printf("\n"); 560 } 561 } 562 else { 563#if 0 564 /* This code has not been tested.... */ 565 if (isdp->id_irq) { 566 icu_unset(ffs(isdp->id_irq) - 1, 567 isdp->id_intr); 568 if (mp) 569 INTRUNMASK(*mp, isdp->id_irq); 570 } 571#else 572 printf ("icu_unset() not supported here ...\n"); 573#endif 574 } 575 } 576} 577 578static caddr_t dma_bouncebuf[8]; 579static u_int dma_bouncebufsize[8]; 580static u_int8_t dma_bounced = 0; 581static u_int8_t dma_busy = 0; /* Used in isa_dmastart() */ 582static u_int8_t dma_inuse = 0; /* User for acquire/release */ 583 584#define VALID_DMA_MASK (7) 585 586/* high byte of address is stored in this port for i-th dma channel */ 587static int dmapageport[8] = { 0x87, 0x83, 0x81, 0x82, 0x8f, 0x8b, 0x89, 0x8a }; 588 589/* 590 * Setup a DMA channel's bounce buffer. 591 */ 592void 593isa_dmainit(chan, bouncebufsize) 594 int chan; 595 u_int bouncebufsize; 596{ 597 void *buf; 598 599#ifdef DIAGNOSTIC 600 if (chan & ~VALID_DMA_MASK) 601 panic("isa_dmainit: channel out of range"); 602 603 if (dma_bouncebuf[chan] != NULL) 604 panic("isa_dmainit: impossible request"); 605#endif 606 607 dma_bouncebufsize[chan] = bouncebufsize; 608 609 /* Try malloc() first. It works better if it works. */ 610 buf = malloc(bouncebufsize, M_DEVBUF, M_NOWAIT); 611 if (buf != NULL) { 612 if (isa_dmarangecheck(buf, bouncebufsize, chan) == 0) { 613 dma_bouncebuf[chan] = buf; 614 return; 615 } 616 free(buf, M_DEVBUF); 617 } 618 buf = contigmalloc(bouncebufsize, M_DEVBUF, M_NOWAIT, 0ul, 0xfffffful, 619 1ul, chan & 4 ? 0x20000ul : 0x10000ul); 620 if (buf == NULL) 621 printf("isa_dmainit(%d, %d) failed\n", chan, bouncebufsize); 622 else 623 dma_bouncebuf[chan] = buf; 624} 625 626/* 627 * Register a DMA channel's usage. Usually called from a device driver 628 * in open() or during it's initialization. 629 */ 630int 631isa_dma_acquire(chan) 632 int chan; 633{ 634#ifdef DIAGNOSTIC 635 if (chan & ~VALID_DMA_MASK) 636 panic("isa_dma_acquire: channel out of range"); 637#endif 638 639 if (dma_inuse & (1 << chan)) { 640 printf("isa_dma_acquire: channel %d already in use\n", chan); 641 return (EBUSY); 642 } 643 dma_inuse |= (1 << chan); 644 645 return (0); 646} 647 648/* 649 * Unregister a DMA channel's usage. Usually called from a device driver 650 * during close() or during it's shutdown. 651 */ 652void 653isa_dma_release(chan) 654 int chan; 655{ 656#ifdef DIAGNOSTIC 657 if (chan & ~VALID_DMA_MASK) 658 panic("isa_dma_release: channel out of range"); 659 660 if (dma_inuse & (1 << chan) == 0) 661 printf("isa_dma_release: channel %d not in use\n", chan); 662#endif 663 664 if (dma_busy & (1 << chan)) { 665 dma_busy &= ~(1 << chan); 666 /* 667 * XXX We should also do "dma_bounced &= (1 << chan);" 668 * because we are acting on behalf of isa_dmadone() which 669 * was not called to end the last DMA operation. This does 670 * not matter now, but it may in the future. 671 */ 672 } 673 674 dma_inuse &= ~(1 << chan); 675} 676 677/* 678 * isa_dmacascade(): program 8237 DMA controller channel to accept 679 * external dma control by a board. 680 */ 681void isa_dmacascade(chan) 682 int chan; 683{ 684#ifdef DIAGNOSTIC 685 if (chan & ~VALID_DMA_MASK) 686 panic("isa_dmacascade: channel out of range"); 687#endif 688 689 /* set dma channel mode, and set dma channel mode */ 690 if ((chan & 4) == 0) { 691 outb(DMA1_MODE, DMA37MD_CASCADE | chan); 692 outb(DMA1_SMSK, chan); 693 } else { 694 outb(DMA2_MODE, DMA37MD_CASCADE | (chan & 3)); 695 outb(DMA2_SMSK, chan & 3); 696 } 697} 698 699/* 700 * isa_dmastart(): program 8237 DMA controller channel, avoid page alignment 701 * problems by using a bounce buffer. 702 */ 703void isa_dmastart(int flags, caddr_t addr, u_int nbytes, int chan) 704{ 705 vm_offset_t phys; 706 int waport; 707 caddr_t newaddr; 708 709#ifdef DIAGNOSTIC 710 if (chan & ~VALID_DMA_MASK) 711 panic("isa_dmastart: channel out of range"); 712 713 if ((chan < 4 && nbytes > (1<<16)) 714 || (chan >= 4 && (nbytes > (1<<17) || (u_int)addr & 1))) 715 panic("isa_dmastart: impossible request"); 716 717 if (dma_inuse & (1 << chan) == 0) 718 printf("isa_dmastart: channel %d not acquired\n", chan); 719#endif 720 721#if 0 722 /* 723 * XXX This should be checked, but drivers like ad1848 only call 724 * isa_dmastart() once because they use Auto DMA mode. If we 725 * leave this in, drivers that do this will print this continuously. 726 */ 727 if (dma_busy & (1 << chan)) 728 printf("isa_dmastart: channel %d busy\n", chan); 729#endif 730 731 dma_busy |= (1 << chan); 732 733 if (isa_dmarangecheck(addr, nbytes, chan)) { 734 if (dma_bouncebuf[chan] == NULL 735 || dma_bouncebufsize[chan] < nbytes) 736 panic("isa_dmastart: bad bounce buffer"); 737 dma_bounced |= (1 << chan); 738 newaddr = dma_bouncebuf[chan]; 739 740 /* copy bounce buffer on write */ 741 if (!(flags & B_READ)) 742 bcopy(addr, newaddr, nbytes); 743 addr = newaddr; 744 } 745 746 /* translate to physical */ 747 phys = pmap_extract(pmap_kernel(), (vm_offset_t)addr); 748 749 if ((chan & 4) == 0) { 750 /* 751 * Program one of DMA channels 0..3. These are 752 * byte mode channels. 753 */ 754 /* set dma channel mode, and reset address ff */ 755 756 /* If B_RAW flag is set, then use autoinitialise mode */ 757 if (flags & B_RAW) { 758 if (flags & B_READ) 759 outb(DMA1_MODE, DMA37MD_AUTO|DMA37MD_WRITE|chan); 760 else 761 outb(DMA1_MODE, DMA37MD_AUTO|DMA37MD_READ|chan); 762 } 763 else 764 if (flags & B_READ) 765 outb(DMA1_MODE, DMA37MD_SINGLE|DMA37MD_WRITE|chan); 766 else 767 outb(DMA1_MODE, DMA37MD_SINGLE|DMA37MD_READ|chan); 768 outb(DMA1_FFC, 0); 769 770 /* send start address */ 771 waport = DMA1_CHN(chan); 772 outb(waport, phys); 773 outb(waport, phys>>8); 774 outb(dmapageport[chan], phys>>16); 775 776 /* send count */ 777 outb(waport + 1, --nbytes); 778 outb(waport + 1, nbytes>>8); 779 780 /* unmask channel */ 781 outb(DMA1_SMSK, chan); 782 } else { 783 /* 784 * Program one of DMA channels 4..7. These are 785 * word mode channels. 786 */ 787 /* set dma channel mode, and reset address ff */ 788 789 /* If B_RAW flag is set, then use autoinitialise mode */ 790 if (flags & B_RAW) { 791 if (flags & B_READ) 792 outb(DMA2_MODE, DMA37MD_AUTO|DMA37MD_WRITE|(chan&3)); 793 else 794 outb(DMA2_MODE, DMA37MD_AUTO|DMA37MD_READ|(chan&3)); 795 } 796 else 797 if (flags & B_READ) 798 outb(DMA2_MODE, DMA37MD_SINGLE|DMA37MD_WRITE|(chan&3)); 799 else 800 outb(DMA2_MODE, DMA37MD_SINGLE|DMA37MD_READ|(chan&3)); 801 outb(DMA2_FFC, 0); 802 803 /* send start address */ 804 waport = DMA2_CHN(chan - 4); 805 outb(waport, phys>>1); 806 outb(waport, phys>>9); 807 outb(dmapageport[chan], phys>>16); 808 809 /* send count */ 810 nbytes >>= 1; 811 outb(waport + 2, --nbytes); 812 outb(waport + 2, nbytes>>8); 813 814 /* unmask channel */ 815 outb(DMA2_SMSK, chan & 3); 816 } 817} 818 819void isa_dmadone(int flags, caddr_t addr, int nbytes, int chan) 820{ 821#ifdef DIAGNOSTIC 822 if (chan & ~VALID_DMA_MASK) 823 panic("isa_dmadone: channel out of range"); 824 825 if (dma_inuse & (1 << chan) == 0) 826 printf("isa_dmadone: channel %d not acquired\n", chan); 827#endif 828 829#if 0 830 /* 831 * XXX This should be checked, but drivers like ad1848 only call 832 * isa_dmastart() once because they use Auto DMA mode. If we 833 * leave this in, drivers that do this will print this continuously. 834 */ 835 if (dma_busy & (1 << chan) == 0) 836 printf("isa_dmadone: channel %d not busy\n", chan); 837#endif 838 839 if (dma_bounced & (1 << chan)) { 840 /* copy bounce buffer on read */ 841 if (flags & B_READ) 842 bcopy(dma_bouncebuf[chan], addr, nbytes); 843 844 dma_bounced &= ~(1 << chan); 845 } 846 dma_busy &= ~(1 << chan); 847} 848 849/* 850 * Check for problems with the address range of a DMA transfer 851 * (non-contiguous physical pages, outside of bus address space, 852 * crossing DMA page boundaries). 853 * Return true if special handling needed. 854 */ 855 856static int 857isa_dmarangecheck(caddr_t va, u_int length, int chan) { 858 vm_offset_t phys, priorpage = 0, endva; 859 u_int dma_pgmsk = (chan & 4) ? ~(128*1024-1) : ~(64*1024-1); 860 861 endva = (vm_offset_t)round_page(va + length); 862 for (; va < (caddr_t) endva ; va += PAGE_SIZE) { 863 phys = trunc_page(pmap_extract(pmap_kernel(), (vm_offset_t)va)); 864#define ISARAM_END RAM_END 865 if (phys == 0) 866 panic("isa_dmacheck: no physical page present"); 867 if (phys >= ISARAM_END) 868 return (1); 869 if (priorpage) { 870 if (priorpage + PAGE_SIZE != phys) 871 return (1); 872 /* check if crossing a DMA page boundary */ 873 if (((u_int)priorpage ^ (u_int)phys) & dma_pgmsk) 874 return (1); 875 } 876 priorpage = phys; 877 } 878 return (0); 879} 880 881/* 882 * Find the highest priority enabled display device. Since we can't 883 * distinguish display devices from ttys, depend on display devices 884 * being sensitive and before sensitive non-display devices (if any) 885 * in isa_devtab_tty. 886 * 887 * XXX we should add capability flags IAMDISPLAY and ISUPPORTCONSOLES. 888 */ 889struct isa_device * 890find_display() 891{ 892 struct isa_device *dvp; 893 894 for (dvp = isa_devtab_tty; dvp->id_driver != NULL; dvp++) 895 if (dvp->id_driver->sensitive_hw && dvp->id_enabled) 896 return (dvp); 897 return (NULL); 898} 899 900/* 901 * find an ISA device in a given isa_devtab_* table, given 902 * the table to search, the expected id_driver entry, and the unit number. 903 * 904 * this function is defined in isa_device.h, and this location is debatable; 905 * i put it there because it's useless w/o, and directly operates on 906 * the other stuff in that file. 907 * 908 */ 909 910struct isa_device *find_isadev(table, driverp, unit) 911 struct isa_device *table; 912 struct isa_driver *driverp; 913 int unit; 914{ 915 if (driverp == NULL) /* sanity check */ 916 return (NULL); 917 918 while ((table->id_driver != driverp) || (table->id_unit != unit)) { 919 if (table->id_driver == 0) 920 return NULL; 921 922 table++; 923 } 924 925 return (table); 926} 927 928