isa.c revision 27749
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 1.98 1997/07/28 09:13:11 msmith 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 <sys/param.h> 51#include <sys/systm.h> 52#include <sys/buf.h> 53#include <sys/malloc.h> 54#include <machine/ipl.h> 55#include <machine/md_var.h> 56#ifdef APIC_IO 57#include <machine/smp.h> 58#include <machine/apic.h> 59#endif /* APIC_IO */ 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/intr_machdep.h> 65#include <i386/isa/isa.h> 66#include <i386/isa/ic/i8237.h> 67 68#include <sys/interrupt.h> 69 70/* 71** Register definitions for DMA controller 1 (channels 0..3): 72*/ 73#define DMA1_CHN(c) (IO_DMA1 + 1*(2*(c))) /* addr reg for channel c */ 74#define DMA1_SMSK (IO_DMA1 + 1*10) /* single mask register */ 75#define DMA1_MODE (IO_DMA1 + 1*11) /* mode register */ 76#define DMA1_FFC (IO_DMA1 + 1*12) /* clear first/last FF */ 77 78/* 79** Register definitions for DMA controller 2 (channels 4..7): 80*/ 81#define DMA2_CHN(c) (IO_DMA2 + 2*(2*(c))) /* addr reg for channel c */ 82#define DMA2_SMSK (IO_DMA2 + 2*10) /* single mask register */ 83#define DMA2_MODE (IO_DMA2 + 2*11) /* mode register */ 84#define DMA2_FFC (IO_DMA2 + 2*12) /* clear first/last FF */ 85 86static void config_isadev __P((struct isa_device *isdp, u_int *mp)); 87static void config_isadev_c __P((struct isa_device *isdp, u_int *mp, 88 int reconfig)); 89static void conflict __P((struct isa_device *dvp, struct isa_device *tmpdvp, 90 int item, char const *whatnot, char const *reason, 91 char const *format)); 92static int haveseen __P((struct isa_device *dvp, struct isa_device *tmpdvp, 93 u_int checkbits)); 94static int isa_dmarangecheck __P((caddr_t va, u_int length, int chan)); 95 96/* 97 * print a conflict message 98 */ 99static void 100conflict(dvp, tmpdvp, item, whatnot, reason, format) 101 struct isa_device *dvp; 102 struct isa_device *tmpdvp; 103 int item; 104 char const *whatnot; 105 char const *reason; 106 char const *format; 107{ 108 printf("%s%d not %sed due to %s conflict with %s%d at ", 109 dvp->id_driver->name, dvp->id_unit, whatnot, reason, 110 tmpdvp->id_driver->name, tmpdvp->id_unit); 111 printf(format, item); 112 printf("\n"); 113} 114 115/* 116 * Check to see if things are already in use, like IRQ's, I/O addresses 117 * and Memory addresses. 118 */ 119static int 120haveseen(dvp, tmpdvp, checkbits) 121 struct isa_device *dvp; 122 struct isa_device *tmpdvp; 123 u_int checkbits; 124{ 125 /* 126 * Only check against devices that have already been found and are not 127 * unilaterally allowed to conflict anyway. 128 */ 129 if (tmpdvp->id_alive && !dvp->id_conflicts) { 130 char const *whatnot; 131 132 whatnot = checkbits & CC_ATTACH ? "attach" : "prob"; 133 /* 134 * Check for I/O address conflict. We can only check the 135 * starting address of the device against the range of the 136 * device that has already been probed since we do not 137 * know how many I/O addresses this device uses. 138 */ 139 if (checkbits & CC_IOADDR && tmpdvp->id_alive != -1) { 140 if ((dvp->id_iobase >= tmpdvp->id_iobase) && 141 (dvp->id_iobase <= 142 (tmpdvp->id_iobase + tmpdvp->id_alive - 1))) { 143 conflict(dvp, tmpdvp, dvp->id_iobase, whatnot, 144 "I/O address", "0x%x"); 145 return 1; 146 } 147 } 148 /* 149 * Check for Memory address conflict. We can check for 150 * range overlap, but it will not catch all cases since the 151 * driver may adjust the msize paramater during probe, for 152 * now we just check that the starting address does not 153 * fall within any allocated region. 154 * XXX could add a second check after the probe for overlap, 155 * since at that time we would know the full range. 156 * XXX KERNBASE is a hack, we should have vaddr in the table! 157 */ 158 if (checkbits & CC_MEMADDR && tmpdvp->id_maddr) { 159 if ((KERNBASE + dvp->id_maddr >= tmpdvp->id_maddr) && 160 (KERNBASE + dvp->id_maddr <= 161 (tmpdvp->id_maddr + tmpdvp->id_msize - 1))) { 162 conflict(dvp, tmpdvp, (int)dvp->id_maddr, 163 whatnot, "maddr", "0x%x"); 164 return 1; 165 } 166 } 167 /* 168 * Check for IRQ conflicts. 169 */ 170 if (checkbits & CC_IRQ && tmpdvp->id_irq) { 171 if (tmpdvp->id_irq == dvp->id_irq) { 172 conflict(dvp, tmpdvp, ffs(dvp->id_irq) - 1, 173 whatnot, "irq", "%d"); 174 return 1; 175 } 176 } 177 /* 178 * Check for DRQ conflicts. 179 */ 180 if (checkbits & CC_DRQ && tmpdvp->id_drq != -1) { 181 if (tmpdvp->id_drq == dvp->id_drq) { 182 conflict(dvp, tmpdvp, dvp->id_drq, whatnot, 183 "drq", "%d"); 184 return 1; 185 } 186 } 187 } 188 return 0; 189} 190 191#ifdef RESOURCE_CHECK 192#include <sys/drvresource.h> 193 194static int 195checkone (struct isa_device *dvp, int type, addr_t low, addr_t high, 196 char *resname, char *resfmt, int attaching) 197{ 198 int result = 0; 199 if (bootverbose) { 200 if (low == high) 201 printf("\tcheck %s: 0x%x\n", resname, low); 202 else 203 printf("\tcheck %s: 0x%x to 0x%x\n", 204 resname, low, high); 205 } 206 if (resource_check(type, RESF_NONE, low, high) != NULL) { 207 char *whatnot = attaching ? "attach" : "prob"; 208 static struct isa_device dummydev; 209 static struct isa_driver dummydrv; 210 struct isa_device *tmpdvp = &dummydev; 211 212 dummydev.id_driver = &dummydrv; 213 dummydev.id_unit = 0; 214 dummydrv.name = "pci"; 215 conflict(dvp, tmpdvp, low, whatnot, resname, resfmt); 216 result = 1; 217 } else if (attaching) { 218 if (low == high) 219 printf("\tregister %s: 0x%x\n", resname, low); 220 else 221 printf("\tregister %s: 0x%x to 0x%x\n", 222 resname, low, high); 223 resource_claim(dvp, type, RESF_NONE, low, high); 224 } 225 return (result); 226} 227 228static int 229check_pciconflict(struct isa_device *dvp, int checkbits) 230{ 231 int result = 0; 232 int attaching = (checkbits & CC_ATTACH) != 0; 233 234 if (checkbits & CC_MEMADDR) { 235 long maddr = dvp->id_maddr; 236 long msize = dvp->id_msize; 237 if (msize > 0) { 238 if (checkone(dvp, REST_MEM, maddr, maddr + msize - 1, 239 "maddr", "0x%x", attaching) != 0) { 240 result = 1; 241 attaching = 0; 242 } 243 } 244 } 245 if (checkbits & CC_IOADDR) { 246 unsigned iobase = dvp->id_iobase; 247 unsigned iosize = dvp->id_alive; 248 if (iosize == -1) 249 iosize = 1; /* XXX can't do much about this ... */ 250 if (iosize > 0) { 251 if (checkone(dvp, REST_PORT, iobase, iobase + iosize -1, 252 "I/O address", "0x%x", attaching) != 0) { 253 result = 1; 254 attaching = 0; 255 } 256 } 257 } 258 if (checkbits & CC_IRQ) { 259 int irq = ffs(dvp->id_irq) - 1; 260 if (irq >= 0) { 261 if (checkone(dvp, REST_INT, irq, irq, 262 "irq", "%d", attaching) != 0) { 263 result = 1; 264 attaching = 0; 265 } 266 } 267 } 268 if (checkbits & CC_DRQ) { 269 int drq = dvp->id_drq; 270 if (drq >= 0) { 271 if (checkone(dvp, REST_DMA, drq, drq, 272 "drq", "%d", attaching) != 0) { 273 result = 1; 274 attaching = 0; 275 } 276 } 277 } 278 if (result != 0) 279 resource_free (dvp); 280 return (result); 281} 282#endif /* RESOURCE_CHECK */ 283 284/* 285 * Search through all the isa_devtab_* tables looking for anything that 286 * conflicts with the current device. 287 */ 288int 289haveseen_isadev(dvp, checkbits) 290 struct isa_device *dvp; 291 u_int checkbits; 292{ 293 struct isa_device *tmpdvp; 294 int status = 0; 295 296 for (tmpdvp = isa_devtab_tty; tmpdvp->id_driver; tmpdvp++) { 297 status |= haveseen(dvp, tmpdvp, checkbits); 298 if (status) 299 return status; 300 } 301 for (tmpdvp = isa_devtab_bio; tmpdvp->id_driver; tmpdvp++) { 302 status |= haveseen(dvp, tmpdvp, checkbits); 303 if (status) 304 return status; 305 } 306 for (tmpdvp = isa_devtab_net; tmpdvp->id_driver; tmpdvp++) { 307 status |= haveseen(dvp, tmpdvp, checkbits); 308 if (status) 309 return status; 310 } 311 for (tmpdvp = isa_devtab_null; tmpdvp->id_driver; tmpdvp++) { 312 status |= haveseen(dvp, tmpdvp, checkbits); 313 if (status) 314 return status; 315 } 316#ifdef RESOURCE_CHECK 317 if (!dvp->id_conflicts) { 318 status = check_pciconflict(dvp, checkbits); 319 } else if (bootverbose) 320 printf("\tnot checking for resource conflicts ...\n"); 321 } 322#endif /* RESOURCE_CHECK */ 323 return(status); 324} 325 326/* 327 * Configure all ISA devices 328 */ 329void 330isa_configure() { 331 struct isa_device *dvp; 332 333 splhigh(); 334 printf("Probing for devices on the ISA bus:\n"); 335 /* First probe all the sensitive probes */ 336 for (dvp = isa_devtab_tty; dvp->id_driver; dvp++) 337 if (dvp->id_driver->sensitive_hw) 338 config_isadev(dvp, &tty_imask); 339 for (dvp = isa_devtab_bio; dvp->id_driver; dvp++) 340 if (dvp->id_driver->sensitive_hw) 341 config_isadev(dvp, &bio_imask); 342 for (dvp = isa_devtab_net; dvp->id_driver; dvp++) 343 if (dvp->id_driver->sensitive_hw) 344 config_isadev(dvp, &net_imask); 345 for (dvp = isa_devtab_null; dvp->id_driver; dvp++) 346 if (dvp->id_driver->sensitive_hw) 347 config_isadev(dvp, (u_int *)NULL); 348 349 /* Then all the bad ones */ 350 for (dvp = isa_devtab_tty; dvp->id_driver; dvp++) 351 if (!dvp->id_driver->sensitive_hw) 352 config_isadev(dvp, &tty_imask); 353 for (dvp = isa_devtab_bio; dvp->id_driver; dvp++) 354 if (!dvp->id_driver->sensitive_hw) 355 config_isadev(dvp, &bio_imask); 356 for (dvp = isa_devtab_net; dvp->id_driver; dvp++) 357 if (!dvp->id_driver->sensitive_hw) 358 config_isadev(dvp, &net_imask); 359 for (dvp = isa_devtab_null; dvp->id_driver; dvp++) 360 if (!dvp->id_driver->sensitive_hw) 361 config_isadev(dvp, (u_int *)NULL); 362 363 bio_imask |= SWI_CLOCK_MASK; 364 net_imask |= SWI_NET_MASK; 365 tty_imask |= SWI_TTY_MASK; 366 367/* 368 * XXX we should really add the tty device to net_imask when the line is 369 * switched to SLIPDISC, and then remove it when it is switched away from 370 * SLIPDISC. No need to block out ALL ttys during a splimp when only one 371 * of them is running slip. 372 * 373 * XXX actually, blocking all ttys during a splimp doesn't matter so much 374 * with sio because the serial interrupt layer doesn't use tty_imask. Only 375 * non-serial ttys suffer. It's more stupid that ALL 'net's are blocked 376 * during spltty. 377 */ 378#include "sl.h" 379#if NSL > 0 380 net_imask |= tty_imask; 381 tty_imask = net_imask; 382#endif 383 384 /* bio_imask |= tty_imask ; can some tty devices use buffers? */ 385 386 if (bootverbose) 387 printf("imasks: bio %x, tty %x, net %x\n", 388 bio_imask, tty_imask, net_imask); 389 390 /* 391 * Finish initializing intr_mask[]. Note that the partly 392 * constructed masks aren't actually used since we're at splhigh. 393 * For fully dynamic initialization, register_intr() and 394 * icu_unset() will have to adjust the masks for _all_ 395 * interrupts and for tty_imask, etc. 396 */ 397 for (dvp = isa_devtab_tty; dvp->id_driver; dvp++) 398 register_imask(dvp, tty_imask); 399 for (dvp = isa_devtab_bio; dvp->id_driver; dvp++) 400 register_imask(dvp, bio_imask); 401 for (dvp = isa_devtab_net; dvp->id_driver; dvp++) 402 register_imask(dvp, net_imask); 403 for (dvp = isa_devtab_null; dvp->id_driver; dvp++) 404 register_imask(dvp, SWI_CLOCK_MASK); 405 spl0(); 406} 407 408/* 409 * Configure an ISA device. 410 */ 411 412 413static void 414config_isadev(isdp, mp) 415 struct isa_device *isdp; 416 u_int *mp; 417{ 418 config_isadev_c(isdp, mp, 0); 419} 420 421void 422reconfig_isadev(isdp, mp) 423 struct isa_device *isdp; 424 u_int *mp; 425{ 426 config_isadev_c(isdp, mp, 1); 427} 428 429static void 430config_isadev_c(isdp, mp, reconfig) 431 struct isa_device *isdp; 432 u_int *mp; 433 int reconfig; 434{ 435 u_int checkbits; 436 int id_alive; 437 int last_alive; 438 struct isa_driver *dp = isdp->id_driver; 439 440 if (!isdp->id_enabled) { 441 printf("%s%d: disabled, not probed.\n", 442 dp->name, isdp->id_unit); 443 return; 444 } 445 checkbits = CC_DRQ | CC_IOADDR | CC_MEMADDR; 446 if (!reconfig && haveseen_isadev(isdp, checkbits)) 447 return; 448 if (!reconfig && isdp->id_maddr) { 449 isdp->id_maddr -= ISA_HOLE_START; 450 isdp->id_maddr += atdevbase; 451 } 452 if (reconfig) { 453 last_alive = isdp->id_alive; 454 isdp->id_reconfig = 1; 455 } 456 else { 457 last_alive = 0; 458 isdp->id_reconfig = 0; 459 } 460 id_alive = (*dp->probe)(isdp); 461 if (id_alive) { 462 /* 463 * Only print the I/O address range if id_alive != -1 464 * Right now this is a temporary fix just for the new 465 * NPX code so that if it finds a 486 that can use trap 466 * 16 it will not report I/O addresses. 467 * Rod Grimes 04/26/94 468 */ 469 if (!isdp->id_reconfig) { 470 printf("%s%d", dp->name, isdp->id_unit); 471 if (id_alive != -1) { 472 if (isdp->id_iobase == -1) 473 printf(" at ?"); 474 else { 475 printf(" at 0x%x", isdp->id_iobase); 476 if (isdp->id_iobase + id_alive - 1 != 477 isdp->id_iobase) { 478 printf("-0x%x", 479 isdp->id_iobase + id_alive - 1); 480 } 481 } 482 } 483 if (isdp->id_irq) 484 printf(" irq %d", ffs(isdp->id_irq) - 1); 485 if (isdp->id_drq != -1) 486 printf(" drq %d", isdp->id_drq); 487 if (isdp->id_maddr) 488 printf(" maddr 0x%lx", kvtop(isdp->id_maddr)); 489 if (isdp->id_msize) 490 printf(" msize %d", isdp->id_msize); 491 if (isdp->id_flags) 492 printf(" flags 0x%x", isdp->id_flags); 493 if (isdp->id_iobase && !(isdp->id_iobase & 0xf300)) { 494 printf(" on motherboard"); 495 } else if (isdp->id_iobase >= 0x1000 && 496 !(isdp->id_iobase & 0x300)) { 497 printf (" on eisa slot %d", 498 isdp->id_iobase >> 12); 499 } else { 500 printf (" on isa"); 501 } 502 printf("\n"); 503 /* 504 * Check for conflicts again. The driver may have 505 * changed *dvp. We should weaken the early check 506 * since the driver may have been able to change 507 * *dvp to avoid conflicts if given a chance. We 508 * already skip the early check for IRQs and force 509 * a check for IRQs in the next group of checks. 510 */ 511 checkbits |= CC_IRQ; 512 if (haveseen_isadev(isdp, checkbits)) { 513 return; 514 } 515 isdp->id_alive = id_alive; 516 } 517 (*dp->attach)(isdp); 518 if (isdp->id_irq) { 519#ifdef APIC_IO 520 /* 521 * Some motherboards use upper IRQs for traditional 522 * ISA INTerrupt sources. In particular we have 523 * seen the secondary IDE connected to IRQ20. 524 * This code detects and fixes this situation. 525 */ 526 u_int apic_mask; 527 int rirq; 528 529 apic_mask = isa_apic_mask(isdp->id_irq); 530 if (apic_mask != isdp->id_irq) { 531 rirq = ffs(isdp->id_irq) - 1; 532 isdp->id_irq = apic_mask; 533 undirect_isa_irq(rirq); /* free for ISA */ 534 } 535#endif /* APIC_IO */ 536 register_intr(ffs(isdp->id_irq) - 1, isdp->id_id, 537 isdp->id_ri_flags, isdp->id_intr, 538 mp, isdp->id_unit); 539 } 540 } else { 541 if (isdp->id_reconfig) { 542 (*dp->attach)(isdp); /* reconfiguration attach */ 543 } 544 if (!last_alive) { 545 if (!isdp->id_reconfig) { 546 printf("%s%d not found", 547 dp->name, isdp->id_unit); 548 if (isdp->id_iobase != -1) 549 printf(" at 0x%x", isdp->id_iobase); 550 printf("\n"); 551 } 552 } 553 else { 554#if 0 555 /* This code has not been tested.... */ 556 if (isdp->id_irq) { 557 icu_unset(ffs(isdp->id_irq) - 1, 558 isdp->id_intr); 559 if (mp) 560 INTRUNMASK(*mp, isdp->id_irq); 561 } 562#else 563 printf ("icu_unset() not supported here ...\n"); 564#endif 565 } 566 } 567} 568 569static caddr_t dma_bouncebuf[8]; 570static u_int dma_bouncebufsize[8]; 571static u_int8_t dma_bounced = 0; 572static u_int8_t dma_busy = 0; /* Used in isa_dmastart() */ 573static u_int8_t dma_inuse = 0; /* User for acquire/release */ 574 575#define VALID_DMA_MASK (7) 576 577/* high byte of address is stored in this port for i-th dma channel */ 578static int dmapageport[8] = { 0x87, 0x83, 0x81, 0x82, 0x8f, 0x8b, 0x89, 0x8a }; 579 580/* 581 * Setup a DMA channel's bounce buffer. 582 */ 583void 584isa_dmainit(chan, bouncebufsize) 585 int chan; 586 u_int bouncebufsize; 587{ 588 void *buf; 589 590#ifdef DIAGNOSTIC 591 if (chan & ~VALID_DMA_MASK) 592 panic("isa_dmainit: channel out of range"); 593 594 if (dma_bouncebuf[chan] != NULL) 595 panic("isa_dmainit: impossible request"); 596#endif 597 598 dma_bouncebufsize[chan] = bouncebufsize; 599 600 /* Try malloc() first. It works better if it works. */ 601 buf = malloc(bouncebufsize, M_DEVBUF, M_NOWAIT); 602 if (buf != NULL) { 603 if (isa_dmarangecheck(buf, bouncebufsize, chan) == 0) { 604 dma_bouncebuf[chan] = buf; 605 return; 606 } 607 free(buf, M_DEVBUF); 608 } 609 buf = contigmalloc(bouncebufsize, M_DEVBUF, M_NOWAIT, 0ul, 0xfffffful, 610 1ul, chan & 4 ? 0x20000ul : 0x10000ul); 611 if (buf == NULL) 612 printf("isa_dmainit(%d, %d) failed\n", chan, bouncebufsize); 613 else 614 dma_bouncebuf[chan] = buf; 615} 616 617/* 618 * Register a DMA channel's usage. Usually called from a device driver 619 * in open() or during it's initialization. 620 */ 621int 622isa_dma_acquire(chan) 623 int chan; 624{ 625#ifdef DIAGNOSTIC 626 if (chan & ~VALID_DMA_MASK) 627 panic("isa_dma_acquire: channel out of range"); 628#endif 629 630 if (dma_inuse & (1 << chan)) { 631 printf("isa_dma_acquire: channel %d already in use\n", chan); 632 return (EBUSY); 633 } 634 dma_inuse |= (1 << chan); 635 636 return (0); 637} 638 639/* 640 * Unregister a DMA channel's usage. Usually called from a device driver 641 * during close() or during it's shutdown. 642 */ 643void 644isa_dma_release(chan) 645 int chan; 646{ 647#ifdef DIAGNOSTIC 648 if (chan & ~VALID_DMA_MASK) 649 panic("isa_dma_release: channel out of range"); 650 651 if (dma_inuse & (1 << chan) == 0) 652 printf("isa_dma_release: channel %d not in use\n", chan); 653#endif 654 655 if (dma_busy & (1 << chan)) { 656 dma_busy &= ~(1 << chan); 657 /* 658 * XXX We should also do "dma_bounced &= (1 << chan);" 659 * because we are acting on behalf of isa_dmadone() which 660 * was not called to end the last DMA operation. This does 661 * not matter now, but it may in the future. 662 */ 663 } 664 665 dma_inuse &= ~(1 << chan); 666} 667 668/* 669 * isa_dmacascade(): program 8237 DMA controller channel to accept 670 * external dma control by a board. 671 */ 672void isa_dmacascade(chan) 673 int chan; 674{ 675#ifdef DIAGNOSTIC 676 if (chan & ~VALID_DMA_MASK) 677 panic("isa_dmacascade: channel out of range"); 678#endif 679 680 /* set dma channel mode, and set dma channel mode */ 681 if ((chan & 4) == 0) { 682 outb(DMA1_MODE, DMA37MD_CASCADE | chan); 683 outb(DMA1_SMSK, chan); 684 } else { 685 outb(DMA2_MODE, DMA37MD_CASCADE | (chan & 3)); 686 outb(DMA2_SMSK, chan & 3); 687 } 688} 689 690/* 691 * isa_dmastart(): program 8237 DMA controller channel, avoid page alignment 692 * problems by using a bounce buffer. 693 */ 694void isa_dmastart(int flags, caddr_t addr, u_int nbytes, int chan) 695{ 696 vm_offset_t phys; 697 int waport; 698 caddr_t newaddr; 699 700#ifdef DIAGNOSTIC 701 if (chan & ~VALID_DMA_MASK) 702 panic("isa_dmastart: channel out of range"); 703 704 if ((chan < 4 && nbytes > (1<<16)) 705 || (chan >= 4 && (nbytes > (1<<17) || (u_int)addr & 1))) 706 panic("isa_dmastart: impossible request"); 707 708 if (dma_inuse & (1 << chan) == 0) 709 printf("isa_dmastart: channel %d not acquired\n", chan); 710#endif 711 712#if 0 713 /* 714 * XXX This should be checked, but drivers like ad1848 only call 715 * isa_dmastart() once because they use Auto DMA mode. If we 716 * leave this in, drivers that do this will print this continuously. 717 */ 718 if (dma_busy & (1 << chan)) 719 printf("isa_dmastart: channel %d busy\n", chan); 720#endif 721 722 dma_busy |= (1 << chan); 723 724 if (isa_dmarangecheck(addr, nbytes, chan)) { 725 if (dma_bouncebuf[chan] == NULL 726 || dma_bouncebufsize[chan] < nbytes) 727 panic("isa_dmastart: bad bounce buffer"); 728 dma_bounced |= (1 << chan); 729 newaddr = dma_bouncebuf[chan]; 730 731 /* copy bounce buffer on write */ 732 if (!(flags & B_READ)) 733 bcopy(addr, newaddr, nbytes); 734 addr = newaddr; 735 } 736 737 /* translate to physical */ 738 phys = pmap_extract(pmap_kernel(), (vm_offset_t)addr); 739 740 if ((chan & 4) == 0) { 741 /* 742 * Program one of DMA channels 0..3. These are 743 * byte mode channels. 744 */ 745 /* set dma channel mode, and reset address ff */ 746 747 /* If B_RAW flag is set, then use autoinitialise mode */ 748 if (flags & B_RAW) { 749 if (flags & B_READ) 750 outb(DMA1_MODE, DMA37MD_AUTO|DMA37MD_WRITE|chan); 751 else 752 outb(DMA1_MODE, DMA37MD_AUTO|DMA37MD_READ|chan); 753 } 754 else 755 if (flags & B_READ) 756 outb(DMA1_MODE, DMA37MD_SINGLE|DMA37MD_WRITE|chan); 757 else 758 outb(DMA1_MODE, DMA37MD_SINGLE|DMA37MD_READ|chan); 759 outb(DMA1_FFC, 0); 760 761 /* send start address */ 762 waport = DMA1_CHN(chan); 763 outb(waport, phys); 764 outb(waport, phys>>8); 765 outb(dmapageport[chan], phys>>16); 766 767 /* send count */ 768 outb(waport + 1, --nbytes); 769 outb(waport + 1, nbytes>>8); 770 771 /* unmask channel */ 772 outb(DMA1_SMSK, chan); 773 } else { 774 /* 775 * Program one of DMA channels 4..7. These are 776 * word mode channels. 777 */ 778 /* set dma channel mode, and reset address ff */ 779 780 /* If B_RAW flag is set, then use autoinitialise mode */ 781 if (flags & B_RAW) { 782 if (flags & B_READ) 783 outb(DMA2_MODE, DMA37MD_AUTO|DMA37MD_WRITE|(chan&3)); 784 else 785 outb(DMA2_MODE, DMA37MD_AUTO|DMA37MD_READ|(chan&3)); 786 } 787 else 788 if (flags & B_READ) 789 outb(DMA2_MODE, DMA37MD_SINGLE|DMA37MD_WRITE|(chan&3)); 790 else 791 outb(DMA2_MODE, DMA37MD_SINGLE|DMA37MD_READ|(chan&3)); 792 outb(DMA2_FFC, 0); 793 794 /* send start address */ 795 waport = DMA2_CHN(chan - 4); 796 outb(waport, phys>>1); 797 outb(waport, phys>>9); 798 outb(dmapageport[chan], phys>>16); 799 800 /* send count */ 801 nbytes >>= 1; 802 outb(waport + 2, --nbytes); 803 outb(waport + 2, nbytes>>8); 804 805 /* unmask channel */ 806 outb(DMA2_SMSK, chan & 3); 807 } 808} 809 810void isa_dmadone(int flags, caddr_t addr, int nbytes, int chan) 811{ 812#ifdef DIAGNOSTIC 813 if (chan & ~VALID_DMA_MASK) 814 panic("isa_dmadone: channel out of range"); 815 816 if (dma_inuse & (1 << chan) == 0) 817 printf("isa_dmadone: channel %d not acquired\n", chan); 818#endif 819 820#if 0 821 /* 822 * XXX This should be checked, but drivers like ad1848 only call 823 * isa_dmastart() once because they use Auto DMA mode. If we 824 * leave this in, drivers that do this will print this continuously. 825 */ 826 if (dma_busy & (1 << chan) == 0) 827 printf("isa_dmadone: channel %d not busy\n", chan); 828#endif 829 830 if (dma_bounced & (1 << chan)) { 831 /* copy bounce buffer on read */ 832 if (flags & B_READ) 833 bcopy(dma_bouncebuf[chan], addr, nbytes); 834 835 dma_bounced &= ~(1 << chan); 836 } 837 dma_busy &= ~(1 << chan); 838} 839 840/* 841 * Check for problems with the address range of a DMA transfer 842 * (non-contiguous physical pages, outside of bus address space, 843 * crossing DMA page boundaries). 844 * Return true if special handling needed. 845 */ 846 847static int 848isa_dmarangecheck(caddr_t va, u_int length, int chan) { 849 vm_offset_t phys, priorpage = 0, endva; 850 u_int dma_pgmsk = (chan & 4) ? ~(128*1024-1) : ~(64*1024-1); 851 852 endva = (vm_offset_t)round_page(va + length); 853 for (; va < (caddr_t) endva ; va += PAGE_SIZE) { 854 phys = trunc_page(pmap_extract(pmap_kernel(), (vm_offset_t)va)); 855#define ISARAM_END RAM_END 856 if (phys == 0) 857 panic("isa_dmacheck: no physical page present"); 858 if (phys >= ISARAM_END) 859 return (1); 860 if (priorpage) { 861 if (priorpage + PAGE_SIZE != phys) 862 return (1); 863 /* check if crossing a DMA page boundary */ 864 if (((u_int)priorpage ^ (u_int)phys) & dma_pgmsk) 865 return (1); 866 } 867 priorpage = phys; 868 } 869 return (0); 870} 871 872/* 873 * Query the progress of a transfer on a DMA channel. 874 * 875 * To avoid having to interrupt a transfer in progress, we sample 876 * each of the high and low databytes twice, and apply the following 877 * logic to determine the correct count. 878 * 879 * Reads are performed with interrupts disabled, thus it is to be 880 * expected that the time between reads is very small. At most 881 * one rollover in the low count byte can be expected within the 882 * four reads that are performed. 883 * 884 * There are three gaps in which a rollover can occur : 885 * 886 * - read low1 887 * gap1 888 * - read high1 889 * gap2 890 * - read low2 891 * gap3 892 * - read high2 893 * 894 * If a rollover occurs in gap1 or gap2, the low2 value will be 895 * greater than the low1 value. In this case, low2 and high2 are a 896 * corresponding pair. 897 * 898 * In any other case, low1 and high1 can be considered to be correct. 899 * 900 * The function returns the number of bytes remaining in the transfer, 901 * or -1 if the channel requested is not active. 902 * 903 */ 904int 905isa_dmastatus(int chan) 906{ 907 u_long cnt = 0; 908 int ffport, waport; 909 u_long low1, high1, low2, high2; 910 u_long ef; 911 912 /* channel active? */ 913 if (dma_inuse & (1 << chan) == 0) { 914 printf("isa_dmastatus: channel %d not active\n", chan); 915 return(-1); 916 } 917 918 /* still busy? */ 919 if (dma_busy & (1 << chan) == 0) { 920 return(0); 921 } 922 923 if (chan < 4) { /* low DMA controller */ 924 ffport = DMA1_FFC; 925 waport = DMA1_CHN(chan) + 1; 926 } else { /* high DMA controller */ 927 ffport = DMA2_FFC; 928 waport = DMA2_CHN(chan - 4) + 2; 929 } 930 931 disable_intr(); /* no interrupts Mr Jones! */ 932 outb(ffport, 0); /* clear register LSB flipflop */ 933 low1 = inb(waport); 934 high1 = inb(waport); 935 outb(ffport, 0); /* clear again */ 936 low2 = inb(waport); 937 high2 = inb(waport); 938 enable_intr(); /* enable interrupts again */ 939 940 /* 941 * Now decide if a wrap has tried to skew our results. 942 * Note that after TC, the count will read 0xffff, while we want 943 * to return zero, so we add and then mask to compensate. 944 */ 945 if (low1 >= low2) { 946 cnt = (low1 + (high1 << 8) + 1) & 0xffff; 947 } else { 948 cnt = (low2 + (high2 << 8) + 1) & 0xffff; 949 } 950 951 if (chan >= 4) /* high channels move words */ 952 cnt *= 2; 953 return(cnt); 954} 955 956/* 957 * Find the highest priority enabled display device. Since we can't 958 * distinguish display devices from ttys, depend on display devices 959 * being sensitive and before sensitive non-display devices (if any) 960 * in isa_devtab_tty. 961 * 962 * XXX we should add capability flags IAMDISPLAY and ISUPPORTCONSOLES. 963 */ 964struct isa_device * 965find_display() 966{ 967 struct isa_device *dvp; 968 969 for (dvp = isa_devtab_tty; dvp->id_driver != NULL; dvp++) 970 if (dvp->id_driver->sensitive_hw && dvp->id_enabled) 971 return (dvp); 972 return (NULL); 973} 974 975/* 976 * find an ISA device in a given isa_devtab_* table, given 977 * the table to search, the expected id_driver entry, and the unit number. 978 * 979 * this function is defined in isa_device.h, and this location is debatable; 980 * i put it there because it's useless w/o, and directly operates on 981 * the other stuff in that file. 982 * 983 */ 984 985struct isa_device *find_isadev(table, driverp, unit) 986 struct isa_device *table; 987 struct isa_driver *driverp; 988 int unit; 989{ 990 if (driverp == NULL) /* sanity check */ 991 return (NULL); 992 993 while ((table->id_driver != driverp) || (table->id_unit != unit)) { 994 if (table->id_driver == 0) 995 return NULL; 996 997 table++; 998 } 999 1000 return (table); 1001} 1002 1003