isa.c revision 30320
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 1.105 1997/09/21 21:41:18 gibbs 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#endif /* APIC_IO */ 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/intr_machdep.h> 64#include <i386/isa/isa.h> 65#include <i386/isa/ic/i8237.h> 66 67#include <sys/interrupt.h> 68 69#include "pnp.h" 70#if NPNP > 0 71#include <i386/isa/pnp.h> 72#endif 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 * Ignore all conflicts except IRQ ones if conflicts are allowed. 131 */ 132 if (dvp->id_conflicts) 133 checkbits &= ~(CC_DRQ | CC_IOADDR | CC_MEMADDR); 134 /* 135 * Only check against devices that have already been found. 136 */ 137 if (tmpdvp->id_alive) { 138 char const *whatnot; 139 140 whatnot = checkbits & CC_ATTACH ? "attach" : "prob"; 141 /* 142 * Check for I/O address conflict. We can only check the 143 * starting address of the device against the range of the 144 * device that has already been probed since we do not 145 * know how many I/O addresses this device uses. 146 */ 147 if (checkbits & CC_IOADDR && tmpdvp->id_alive != -1) { 148 if ((dvp->id_iobase >= tmpdvp->id_iobase) && 149 (dvp->id_iobase <= 150 (tmpdvp->id_iobase + tmpdvp->id_alive - 1))) { 151 conflict(dvp, tmpdvp, dvp->id_iobase, whatnot, 152 "I/O address", "0x%x"); 153 return 1; 154 } 155 } 156 /* 157 * Check for Memory address conflict. We can check for 158 * range overlap, but it will not catch all cases since the 159 * driver may adjust the msize paramater during probe, for 160 * now we just check that the starting address does not 161 * fall within any allocated region. 162 * XXX could add a second check after the probe for overlap, 163 * since at that time we would know the full range. 164 * XXX KERNBASE is a hack, we should have vaddr in the table! 165 */ 166 if (checkbits & CC_MEMADDR && tmpdvp->id_maddr) { 167 if ((KERNBASE + dvp->id_maddr >= tmpdvp->id_maddr) && 168 (KERNBASE + dvp->id_maddr <= 169 (tmpdvp->id_maddr + tmpdvp->id_msize - 1))) { 170 conflict(dvp, tmpdvp, (int)dvp->id_maddr, 171 whatnot, "maddr", "0x%x"); 172 return 1; 173 } 174 } 175 /* 176 * Check for IRQ conflicts. 177 */ 178 if (checkbits & CC_IRQ && tmpdvp->id_irq) { 179 if (tmpdvp->id_irq == dvp->id_irq) { 180 conflict(dvp, tmpdvp, ffs(dvp->id_irq) - 1, 181 whatnot, "irq", "%d"); 182 return 1; 183 } 184 } 185 /* 186 * Check for DRQ conflicts. 187 */ 188 if (checkbits & CC_DRQ && tmpdvp->id_drq != -1) { 189 if (tmpdvp->id_drq == dvp->id_drq) { 190 conflict(dvp, tmpdvp, dvp->id_drq, whatnot, 191 "drq", "%d"); 192 return 1; 193 } 194 } 195 } 196 return 0; 197} 198 199#ifdef RESOURCE_CHECK 200#include <sys/drvresource.h> 201 202static int 203checkone (struct isa_device *dvp, int type, addr_t low, addr_t high, 204 char *resname, char *resfmt, int attaching) 205{ 206 int result = 0; 207 if (bootverbose) { 208 if (low == high) 209 printf("\tcheck %s: 0x%x\n", resname, low); 210 else 211 printf("\tcheck %s: 0x%x to 0x%x\n", 212 resname, low, high); 213 } 214 if (resource_check(type, RESF_NONE, low, high) != NULL) { 215 char *whatnot = attaching ? "attach" : "prob"; 216 static struct isa_device dummydev; 217 static struct isa_driver dummydrv; 218 struct isa_device *tmpdvp = &dummydev; 219 220 dummydev.id_driver = &dummydrv; 221 dummydev.id_unit = 0; 222 dummydrv.name = "pci"; 223 conflict(dvp, tmpdvp, low, whatnot, resname, resfmt); 224 result = 1; 225 } else if (attaching) { 226 if (low == high) 227 printf("\tregister %s: 0x%x\n", resname, low); 228 else 229 printf("\tregister %s: 0x%x to 0x%x\n", 230 resname, low, high); 231 resource_claim(dvp, type, RESF_NONE, low, high); 232 } 233 return (result); 234} 235 236static int 237check_pciconflict(struct isa_device *dvp, int checkbits) 238{ 239 int result = 0; 240 int attaching = (checkbits & CC_ATTACH) != 0; 241 242 if (checkbits & CC_MEMADDR) { 243 long maddr = dvp->id_maddr; 244 long msize = dvp->id_msize; 245 if (msize > 0) { 246 if (checkone(dvp, REST_MEM, maddr, maddr + msize - 1, 247 "maddr", "0x%x", attaching) != 0) { 248 result = 1; 249 attaching = 0; 250 } 251 } 252 } 253 if (checkbits & CC_IOADDR) { 254 unsigned iobase = dvp->id_iobase; 255 unsigned iosize = dvp->id_alive; 256 if (iosize == -1) 257 iosize = 1; /* XXX can't do much about this ... */ 258 if (iosize > 0) { 259 if (checkone(dvp, REST_PORT, iobase, iobase + iosize -1, 260 "I/O address", "0x%x", attaching) != 0) { 261 result = 1; 262 attaching = 0; 263 } 264 } 265 } 266 if (checkbits & CC_IRQ) { 267 int irq = ffs(dvp->id_irq) - 1; 268 if (irq >= 0) { 269 if (checkone(dvp, REST_INT, irq, irq, 270 "irq", "%d", attaching) != 0) { 271 result = 1; 272 attaching = 0; 273 } 274 } 275 } 276 if (checkbits & CC_DRQ) { 277 int drq = dvp->id_drq; 278 if (drq >= 0) { 279 if (checkone(dvp, REST_DMA, drq, drq, 280 "drq", "%d", attaching) != 0) { 281 result = 1; 282 attaching = 0; 283 } 284 } 285 } 286 if (result != 0) 287 resource_free (dvp); 288 return (result); 289} 290#endif /* RESOURCE_CHECK */ 291 292/* 293 * Search through all the isa_devtab_* tables looking for anything that 294 * conflicts with the current device. 295 */ 296int 297haveseen_isadev(dvp, checkbits) 298 struct isa_device *dvp; 299 u_int checkbits; 300{ 301#if NPNP > 0 302 struct pnp_dlist_node *nod; 303#endif 304 struct isa_device *tmpdvp; 305 int status = 0; 306 307 for (tmpdvp = isa_devtab_tty; tmpdvp->id_driver; tmpdvp++) { 308 status |= haveseen(dvp, tmpdvp, checkbits); 309 if (status) 310 return status; 311 } 312 for (tmpdvp = isa_devtab_bio; tmpdvp->id_driver; tmpdvp++) { 313 status |= haveseen(dvp, tmpdvp, checkbits); 314 if (status) 315 return status; 316 } 317 for (tmpdvp = isa_devtab_net; tmpdvp->id_driver; tmpdvp++) { 318 status |= haveseen(dvp, tmpdvp, checkbits); 319 if (status) 320 return status; 321 } 322 for (tmpdvp = isa_devtab_cam; tmpdvp->id_driver; tmpdvp++) { 323 status |= haveseen(dvp, tmpdvp, checkbits); 324 if (status) 325 return status; 326 } 327 for (tmpdvp = isa_devtab_null; tmpdvp->id_driver; tmpdvp++) { 328 status |= haveseen(dvp, tmpdvp, checkbits); 329 if (status) 330 return status; 331 } 332#if NPNP > 0 333 for (nod = pnp_device_list; nod != NULL; nod = nod->next) 334 if (status |= haveseen(dvp, &(nod->dev), checkbits)) 335 return status; 336#endif 337#ifdef RESOURCE_CHECK 338 if (!dvp->id_conflicts) { 339 status = check_pciconflict(dvp, checkbits); 340 } else if (bootverbose) 341 printf("\tnot checking for resource conflicts ...\n"); 342 } 343#endif /* RESOURCE_CHECK */ 344 return(status); 345} 346 347/* 348 * Configure all ISA devices 349 */ 350void 351isa_configure() { 352 struct isa_device *dvp; 353 354 splhigh(); 355 printf("Probing for devices on the ISA bus:\n"); 356 /* First probe all the sensitive probes */ 357 for (dvp = isa_devtab_tty; dvp->id_driver; dvp++) 358 if (dvp->id_driver->sensitive_hw) 359 config_isadev(dvp, &tty_imask); 360 for (dvp = isa_devtab_bio; dvp->id_driver; dvp++) 361 if (dvp->id_driver->sensitive_hw) 362 config_isadev(dvp, &bio_imask); 363 for (dvp = isa_devtab_net; dvp->id_driver; dvp++) 364 if (dvp->id_driver->sensitive_hw) 365 config_isadev(dvp, &net_imask); 366 for (dvp = isa_devtab_cam; dvp->id_driver; dvp++) 367 if (dvp->id_driver->sensitive_hw) 368 config_isadev(dvp, &cam_imask); 369 for (dvp = isa_devtab_null; dvp->id_driver; dvp++) 370 if (dvp->id_driver->sensitive_hw) 371 config_isadev(dvp, (u_int *)NULL); 372 373 /* Then all the bad ones */ 374 for (dvp = isa_devtab_tty; dvp->id_driver; dvp++) 375 if (!dvp->id_driver->sensitive_hw) 376 config_isadev(dvp, &tty_imask); 377 for (dvp = isa_devtab_bio; dvp->id_driver; dvp++) 378 if (!dvp->id_driver->sensitive_hw) 379 config_isadev(dvp, &bio_imask); 380 for (dvp = isa_devtab_net; dvp->id_driver; dvp++) 381 if (!dvp->id_driver->sensitive_hw) 382 config_isadev(dvp, &net_imask); 383 for (dvp = isa_devtab_cam; dvp->id_driver; dvp++) 384 if (!dvp->id_driver->sensitive_hw) 385 config_isadev(dvp, &cam_imask); 386 for (dvp = isa_devtab_null; dvp->id_driver; dvp++) 387 if (!dvp->id_driver->sensitive_hw) 388 config_isadev(dvp, (u_int *)NULL); 389 390 bio_imask |= SWI_CLOCK_MASK; 391 net_imask |= SWI_NET_MASK; 392 tty_imask |= SWI_TTY_MASK; 393 394/* 395 * XXX we should really add the tty device to net_imask when the line is 396 * switched to SLIPDISC, and then remove it when it is switched away from 397 * SLIPDISC. No need to block out ALL ttys during a splimp when only one 398 * of them is running slip. 399 * 400 * XXX actually, blocking all ttys during a splimp doesn't matter so much 401 * with sio because the serial interrupt layer doesn't use tty_imask. Only 402 * non-serial ttys suffer. It's more stupid that ALL 'net's are blocked 403 * during spltty. 404 */ 405#include "sl.h" 406#if NSL > 0 407 net_imask |= tty_imask; 408 tty_imask = net_imask; 409#endif 410 411 /* bio_imask |= tty_imask ; can some tty devices use buffers? */ 412 413 if (bootverbose) 414 printf("imasks: bio %x, tty %x, net %x\n", 415 bio_imask, tty_imask, net_imask); 416 417 /* 418 * Finish initializing intr_mask[]. Note that the partly 419 * constructed masks aren't actually used since we're at splhigh. 420 * For fully dynamic initialization, register_intr() and 421 * icu_unset() will have to adjust the masks for _all_ 422 * interrupts and for tty_imask, etc. 423 */ 424 for (dvp = isa_devtab_tty; dvp->id_driver; dvp++) 425 register_imask(dvp, tty_imask); 426 for (dvp = isa_devtab_bio; dvp->id_driver; dvp++) 427 register_imask(dvp, bio_imask); 428 for (dvp = isa_devtab_net; dvp->id_driver; dvp++) 429 register_imask(dvp, net_imask); 430 for (dvp = isa_devtab_cam; dvp->id_driver; dvp++) 431 register_imask(dvp, cam_imask); 432 for (dvp = isa_devtab_null; dvp->id_driver; dvp++) 433 register_imask(dvp, SWI_CLOCK_MASK); 434 spl0(); 435} 436 437/* 438 * Configure an ISA device. 439 */ 440 441 442static void 443config_isadev(isdp, mp) 444 struct isa_device *isdp; 445 u_int *mp; 446{ 447 config_isadev_c(isdp, mp, 0); 448} 449 450void 451reconfig_isadev(isdp, mp) 452 struct isa_device *isdp; 453 u_int *mp; 454{ 455 config_isadev_c(isdp, mp, 1); 456} 457 458static void 459config_isadev_c(isdp, mp, reconfig) 460 struct isa_device *isdp; 461 u_int *mp; 462 int reconfig; 463{ 464 u_int checkbits; 465 int id_alive; 466 int last_alive; 467 struct isa_driver *dp = isdp->id_driver; 468 469 if (!isdp->id_enabled) { 470 if (bootverbose) 471 printf("%s%d: disabled, not probed.\n", dp->name, isdp->id_unit); 472 return; 473 } 474 checkbits = CC_DRQ | CC_IOADDR | CC_MEMADDR; 475 if (!reconfig && haveseen_isadev(isdp, checkbits)) 476 return; 477 if (!reconfig && isdp->id_maddr) { 478 isdp->id_maddr -= ISA_HOLE_START; 479 isdp->id_maddr += atdevbase; 480 } 481 if (reconfig) { 482 last_alive = isdp->id_alive; 483 isdp->id_reconfig = 1; 484 } 485 else { 486 last_alive = 0; 487 isdp->id_reconfig = 0; 488 } 489 id_alive = (*dp->probe)(isdp); 490 if (id_alive) { 491 /* 492 * Only print the I/O address range if id_alive != -1 493 * Right now this is a temporary fix just for the new 494 * NPX code so that if it finds a 486 that can use trap 495 * 16 it will not report I/O addresses. 496 * Rod Grimes 04/26/94 497 */ 498 if (!isdp->id_reconfig) { 499 printf("%s%d", dp->name, isdp->id_unit); 500 if (id_alive != -1) { 501 if (isdp->id_iobase == -1) 502 printf(" at ?"); 503 else { 504 printf(" at 0x%x", isdp->id_iobase); 505 if (isdp->id_iobase + id_alive - 1 != 506 isdp->id_iobase) { 507 printf("-0x%x", 508 isdp->id_iobase + id_alive - 1); 509 } 510 } 511 } 512 if (isdp->id_irq) 513 printf(" irq %d", ffs(isdp->id_irq) - 1); 514 if (isdp->id_drq != -1) 515 printf(" drq %d", isdp->id_drq); 516 if (isdp->id_maddr) 517 printf(" maddr 0x%lx", kvtop(isdp->id_maddr)); 518 if (isdp->id_msize) 519 printf(" msize %d", isdp->id_msize); 520 if (isdp->id_flags) 521 printf(" flags 0x%x", isdp->id_flags); 522 if (isdp->id_iobase && !(isdp->id_iobase & 0xf300)) { 523 printf(" on motherboard"); 524 } else if (isdp->id_iobase >= 0x1000 && 525 !(isdp->id_iobase & 0x300)) { 526 printf (" on eisa slot %d", 527 isdp->id_iobase >> 12); 528 } else { 529 printf (" on isa"); 530 } 531 printf("\n"); 532 /* 533 * Check for conflicts again. The driver may have 534 * changed *dvp. We should weaken the early check 535 * since the driver may have been able to change 536 * *dvp to avoid conflicts if given a chance. We 537 * already skip the early check for IRQs and force 538 * a check for IRQs in the next group of checks. 539 */ 540 checkbits |= CC_IRQ; 541 if (haveseen_isadev(isdp, checkbits)) 542 return; 543 isdp->id_alive = id_alive; 544 } 545 (*dp->attach)(isdp); 546 if (isdp->id_irq) { 547#ifdef APIC_IO 548 /* 549 * Some motherboards use upper IRQs for traditional 550 * ISA INTerrupt sources. In particular we have 551 * seen the secondary IDE connected to IRQ20. 552 * This code detects and fixes this situation. 553 */ 554 u_int apic_mask; 555 int rirq; 556 557 apic_mask = isa_apic_mask(isdp->id_irq); 558 if (apic_mask != isdp->id_irq) { 559 rirq = ffs(isdp->id_irq) - 1; 560 isdp->id_irq = apic_mask; 561 undirect_isa_irq(rirq); /* free for ISA */ 562 } 563#endif /* APIC_IO */ 564 register_intr(ffs(isdp->id_irq) - 1, isdp->id_id, 565 isdp->id_ri_flags, isdp->id_intr, 566 mp, isdp->id_unit); 567 } 568 } else { 569 if (isdp->id_reconfig) { 570 (*dp->attach)(isdp); /* reconfiguration attach */ 571 } 572 if (!last_alive) { 573 if (!isdp->id_reconfig) { 574 printf("%s%d not found", 575 dp->name, isdp->id_unit); 576 if (isdp->id_iobase != -1) 577 printf(" at 0x%x", isdp->id_iobase); 578 printf("\n"); 579 } 580 } else { 581#if 0 582 /* This code has not been tested.... */ 583 if (isdp->id_irq) { 584 icu_unset(ffs(isdp->id_irq) - 1, 585 isdp->id_intr); 586 if (mp) 587 INTRUNMASK(*mp, isdp->id_irq); 588 } 589#else 590 printf ("icu_unset() not supported here ...\n"); 591#endif 592 } 593 } 594} 595 596static caddr_t dma_bouncebuf[8]; 597static u_int dma_bouncebufsize[8]; 598static u_int8_t dma_bounced = 0; 599static u_int8_t dma_busy = 0; /* Used in isa_dmastart() */ 600static u_int8_t dma_inuse = 0; /* User for acquire/release */ 601static u_int8_t dma_auto_mode = 0; 602 603#define VALID_DMA_MASK (7) 604 605/* high byte of address is stored in this port for i-th dma channel */ 606static int dmapageport[8] = { 0x87, 0x83, 0x81, 0x82, 0x8f, 0x8b, 0x89, 0x8a }; 607 608/* 609 * Setup a DMA channel's bounce buffer. 610 */ 611void 612isa_dmainit(chan, bouncebufsize) 613 int chan; 614 u_int bouncebufsize; 615{ 616 void *buf; 617 618#ifdef DIAGNOSTIC 619 if (chan & ~VALID_DMA_MASK) 620 panic("isa_dmainit: channel out of range"); 621 622 if (dma_bouncebuf[chan] != NULL) 623 panic("isa_dmainit: impossible request"); 624#endif 625 626 dma_bouncebufsize[chan] = bouncebufsize; 627 628 /* Try malloc() first. It works better if it works. */ 629 buf = malloc(bouncebufsize, M_DEVBUF, M_NOWAIT); 630 if (buf != NULL) { 631 if (isa_dmarangecheck(buf, bouncebufsize, chan) == 0) { 632 dma_bouncebuf[chan] = buf; 633 return; 634 } 635 free(buf, M_DEVBUF); 636 } 637 buf = contigmalloc(bouncebufsize, M_DEVBUF, M_NOWAIT, 0ul, 0xfffffful, 638 1ul, chan & 4 ? 0x20000ul : 0x10000ul); 639 if (buf == NULL) 640 printf("isa_dmainit(%d, %d) failed\n", chan, bouncebufsize); 641 else 642 dma_bouncebuf[chan] = buf; 643} 644 645/* 646 * Register a DMA channel's usage. Usually called from a device driver 647 * in open() or during it's initialization. 648 */ 649int 650isa_dma_acquire(chan) 651 int chan; 652{ 653#ifdef DIAGNOSTIC 654 if (chan & ~VALID_DMA_MASK) 655 panic("isa_dma_acquire: channel out of range"); 656#endif 657 658 if (dma_inuse & (1 << chan)) { 659 printf("isa_dma_acquire: channel %d already in use\n", chan); 660 return (EBUSY); 661 } 662 dma_inuse |= (1 << chan); 663 dma_auto_mode &= ~(1 << chan); 664 665 return (0); 666} 667 668/* 669 * Unregister a DMA channel's usage. Usually called from a device driver 670 * during close() or during it's shutdown. 671 */ 672void 673isa_dma_release(chan) 674 int chan; 675{ 676#ifdef DIAGNOSTIC 677 if (chan & ~VALID_DMA_MASK) 678 panic("isa_dma_release: channel out of range"); 679 680 if ((dma_inuse & (1 << chan)) == 0) 681 printf("isa_dma_release: channel %d not in use\n", chan); 682#endif 683 684 if (dma_busy & (1 << chan)) { 685 dma_busy &= ~(1 << chan); 686 /* 687 * XXX We should also do "dma_bounced &= (1 << chan);" 688 * because we are acting on behalf of isa_dmadone() which 689 * was not called to end the last DMA operation. This does 690 * not matter now, but it may in the future. 691 */ 692 } 693 694 dma_inuse &= ~(1 << chan); 695 dma_auto_mode &= ~(1 << chan); 696} 697 698/* 699 * isa_dmacascade(): program 8237 DMA controller channel to accept 700 * external dma control by a board. 701 */ 702void isa_dmacascade(chan) 703 int chan; 704{ 705#ifdef DIAGNOSTIC 706 if (chan & ~VALID_DMA_MASK) 707 panic("isa_dmacascade: channel out of range"); 708#endif 709 710 /* set dma channel mode, and set dma channel mode */ 711 if ((chan & 4) == 0) { 712 outb(DMA1_MODE, DMA37MD_CASCADE | chan); 713 outb(DMA1_SMSK, chan); 714 } else { 715 outb(DMA2_MODE, DMA37MD_CASCADE | (chan & 3)); 716 outb(DMA2_SMSK, chan & 3); 717 } 718} 719 720/* 721 * isa_dmastart(): program 8237 DMA controller channel, avoid page alignment 722 * problems by using a bounce buffer. 723 */ 724void isa_dmastart(int flags, caddr_t addr, u_int nbytes, int chan) 725{ 726 vm_offset_t phys; 727 int waport; 728 caddr_t newaddr; 729 730#ifdef DIAGNOSTIC 731 if (chan & ~VALID_DMA_MASK) 732 panic("isa_dmastart: channel out of range"); 733 734 if ((chan < 4 && nbytes > (1<<16)) 735 || (chan >= 4 && (nbytes > (1<<17) || (u_int)addr & 1))) 736 panic("isa_dmastart: impossible request"); 737 738 if ((dma_inuse & (1 << chan)) == 0) 739 printf("isa_dmastart: channel %d not acquired\n", chan); 740#endif 741 742#if 0 743 /* 744 * XXX This should be checked, but drivers like ad1848 only call 745 * isa_dmastart() once because they use Auto DMA mode. If we 746 * leave this in, drivers that do this will print this continuously. 747 */ 748 if (dma_busy & (1 << chan)) 749 printf("isa_dmastart: channel %d busy\n", chan); 750#endif 751 752 dma_busy |= (1 << chan); 753 754 if (isa_dmarangecheck(addr, nbytes, chan)) { 755 if (dma_bouncebuf[chan] == NULL 756 || dma_bouncebufsize[chan] < nbytes) 757 panic("isa_dmastart: bad bounce buffer"); 758 dma_bounced |= (1 << chan); 759 newaddr = dma_bouncebuf[chan]; 760 761 /* copy bounce buffer on write */ 762 if (!(flags & B_READ)) 763 bcopy(addr, newaddr, nbytes); 764 addr = newaddr; 765 } 766 767 /* translate to physical */ 768 phys = pmap_extract(pmap_kernel(), (vm_offset_t)addr); 769 770 if (flags & B_RAW) { 771 dma_auto_mode |= (1 << chan); 772 } else { 773 dma_auto_mode &= ~(1 << chan); 774 } 775 776 if ((chan & 4) == 0) { 777 /* 778 * Program one of DMA channels 0..3. These are 779 * byte mode channels. 780 */ 781 /* set dma channel mode, and reset address ff */ 782 783 /* If B_RAW flag is set, then use autoinitialise mode */ 784 if (flags & B_RAW) { 785 if (flags & B_READ) 786 outb(DMA1_MODE, DMA37MD_AUTO|DMA37MD_WRITE|chan); 787 else 788 outb(DMA1_MODE, DMA37MD_AUTO|DMA37MD_READ|chan); 789 } 790 else 791 if (flags & B_READ) 792 outb(DMA1_MODE, DMA37MD_SINGLE|DMA37MD_WRITE|chan); 793 else 794 outb(DMA1_MODE, DMA37MD_SINGLE|DMA37MD_READ|chan); 795 outb(DMA1_FFC, 0); 796 797 /* send start address */ 798 waport = DMA1_CHN(chan); 799 outb(waport, phys); 800 outb(waport, phys>>8); 801 outb(dmapageport[chan], phys>>16); 802 803 /* send count */ 804 outb(waport + 1, --nbytes); 805 outb(waport + 1, nbytes>>8); 806 807 /* unmask channel */ 808 outb(DMA1_SMSK, chan); 809 } else { 810 /* 811 * Program one of DMA channels 4..7. These are 812 * word mode channels. 813 */ 814 /* set dma channel mode, and reset address ff */ 815 816 /* If B_RAW flag is set, then use autoinitialise mode */ 817 if (flags & B_RAW) { 818 if (flags & B_READ) 819 outb(DMA2_MODE, DMA37MD_AUTO|DMA37MD_WRITE|(chan&3)); 820 else 821 outb(DMA2_MODE, DMA37MD_AUTO|DMA37MD_READ|(chan&3)); 822 } 823 else 824 if (flags & B_READ) 825 outb(DMA2_MODE, DMA37MD_SINGLE|DMA37MD_WRITE|(chan&3)); 826 else 827 outb(DMA2_MODE, DMA37MD_SINGLE|DMA37MD_READ|(chan&3)); 828 outb(DMA2_FFC, 0); 829 830 /* send start address */ 831 waport = DMA2_CHN(chan - 4); 832 outb(waport, phys>>1); 833 outb(waport, phys>>9); 834 outb(dmapageport[chan], phys>>16); 835 836 /* send count */ 837 nbytes >>= 1; 838 outb(waport + 2, --nbytes); 839 outb(waport + 2, nbytes>>8); 840 841 /* unmask channel */ 842 outb(DMA2_SMSK, chan & 3); 843 } 844} 845 846void isa_dmadone(int flags, caddr_t addr, int nbytes, int chan) 847{ 848#ifdef DIAGNOSTIC 849 if (chan & ~VALID_DMA_MASK) 850 panic("isa_dmadone: channel out of range"); 851 852 if ((dma_inuse & (1 << chan)) == 0) 853 printf("isa_dmadone: channel %d not acquired\n", chan); 854#endif 855 856 if (((dma_busy & (1 << chan)) == 0) && 857 (dma_auto_mode & (1 << chan)) == 0 ) 858 printf("isa_dmadone: channel %d not busy\n", chan); 859 860 861 if (dma_bounced & (1 << chan)) { 862 /* copy bounce buffer on read */ 863 if (flags & B_READ) 864 bcopy(dma_bouncebuf[chan], addr, nbytes); 865 866 dma_bounced &= ~(1 << chan); 867 } 868 dma_busy &= ~(1 << chan); 869} 870 871/* 872 * Check for problems with the address range of a DMA transfer 873 * (non-contiguous physical pages, outside of bus address space, 874 * crossing DMA page boundaries). 875 * Return true if special handling needed. 876 */ 877 878static int 879isa_dmarangecheck(caddr_t va, u_int length, int chan) { 880 vm_offset_t phys, priorpage = 0, endva; 881 u_int dma_pgmsk = (chan & 4) ? ~(128*1024-1) : ~(64*1024-1); 882 883 endva = (vm_offset_t)round_page(va + length); 884 for (; va < (caddr_t) endva ; va += PAGE_SIZE) { 885 phys = trunc_page(pmap_extract(pmap_kernel(), (vm_offset_t)va)); 886#define ISARAM_END RAM_END 887 if (phys == 0) 888 panic("isa_dmacheck: no physical page present"); 889 if (phys >= ISARAM_END) 890 return (1); 891 if (priorpage) { 892 if (priorpage + PAGE_SIZE != phys) 893 return (1); 894 /* check if crossing a DMA page boundary */ 895 if (((u_int)priorpage ^ (u_int)phys) & dma_pgmsk) 896 return (1); 897 } 898 priorpage = phys; 899 } 900 return (0); 901} 902 903/* 904 * Query the progress of a transfer on a DMA channel. 905 * 906 * To avoid having to interrupt a transfer in progress, we sample 907 * each of the high and low databytes twice, and apply the following 908 * logic to determine the correct count. 909 * 910 * Reads are performed with interrupts disabled, thus it is to be 911 * expected that the time between reads is very small. At most 912 * one rollover in the low count byte can be expected within the 913 * four reads that are performed. 914 * 915 * There are three gaps in which a rollover can occur : 916 * 917 * - read low1 918 * gap1 919 * - read high1 920 * gap2 921 * - read low2 922 * gap3 923 * - read high2 924 * 925 * If a rollover occurs in gap1 or gap2, the low2 value will be 926 * greater than the low1 value. In this case, low2 and high2 are a 927 * corresponding pair. 928 * 929 * In any other case, low1 and high1 can be considered to be correct. 930 * 931 * The function returns the number of bytes remaining in the transfer, 932 * or -1 if the channel requested is not active. 933 * 934 */ 935int 936isa_dmastatus(int chan) 937{ 938 u_long cnt = 0; 939 int ffport, waport; 940 u_long low1, high1, low2, high2; 941 942 /* channel active? */ 943 if ((dma_inuse & (1 << chan)) == 0) { 944 printf("isa_dmastatus: channel %d not active\n", chan); 945 return(-1); 946 } 947 /* channel busy? */ 948 949 if (((dma_busy & (1 << chan)) == 0) && 950 (dma_auto_mode & (1 << chan)) == 0 ) { 951 printf("chan %d not busy\n", chan); 952 return -2 ; 953 } 954 if (chan < 4) { /* low DMA controller */ 955 ffport = DMA1_FFC; 956 waport = DMA1_CHN(chan) + 1; 957 } else { /* high DMA controller */ 958 ffport = DMA2_FFC; 959 waport = DMA2_CHN(chan - 4) + 2; 960 } 961 962 disable_intr(); /* no interrupts Mr Jones! */ 963 outb(ffport, 0); /* clear register LSB flipflop */ 964 low1 = inb(waport); 965 high1 = inb(waport); 966 outb(ffport, 0); /* clear again */ 967 low2 = inb(waport); 968 high2 = inb(waport); 969 enable_intr(); /* enable interrupts again */ 970 971 /* 972 * Now decide if a wrap has tried to skew our results. 973 * Note that after TC, the count will read 0xffff, while we want 974 * to return zero, so we add and then mask to compensate. 975 */ 976 if (low1 >= low2) { 977 cnt = (low1 + (high1 << 8) + 1) & 0xffff; 978 } else { 979 cnt = (low2 + (high2 << 8) + 1) & 0xffff; 980 } 981 982 if (chan >= 4) /* high channels move words */ 983 cnt *= 2; 984 return(cnt); 985} 986 987/* 988 * Stop a DMA transfer currently in progress. 989 */ 990int 991isa_dmastop(int chan) 992{ 993 if ((dma_inuse & (1 << chan)) == 0) 994 printf("isa_dmastop: channel %d not acquired\n", chan); 995 996 if (((dma_busy & (1 << chan)) == 0) && 997 ((dma_auto_mode & (1 << chan)) == 0)) { 998 printf("chan %d not busy\n", chan); 999 return -2 ; 1000 } 1001 1002 if ((chan & 4) == 0) { 1003 outb(DMA1_SMSK, (chan & 3) | 4 /* disable mask */); 1004 } else { 1005 outb(DMA2_SMSK, (chan & 3) | 4 /* disable mask */); 1006 } 1007 return(isa_dmastatus(chan)); 1008} 1009 1010/* 1011 * Find the highest priority enabled display device. Since we can't 1012 * distinguish display devices from ttys, depend on display devices 1013 * being sensitive and before sensitive non-display devices (if any) 1014 * in isa_devtab_tty. 1015 * 1016 * XXX we should add capability flags IAMDISPLAY and ISUPPORTCONSOLES. 1017 */ 1018struct isa_device * 1019find_display() 1020{ 1021 struct isa_device *dvp; 1022 1023 for (dvp = isa_devtab_tty; dvp->id_driver != NULL; dvp++) 1024 if (dvp->id_driver->sensitive_hw && dvp->id_enabled) 1025 return (dvp); 1026 return (NULL); 1027} 1028 1029/* 1030 * find an ISA device in a given isa_devtab_* table, given 1031 * the table to search, the expected id_driver entry, and the unit number. 1032 * 1033 * this function is defined in isa_device.h, and this location is debatable; 1034 * i put it there because it's useless w/o, and directly operates on 1035 * the other stuff in that file. 1036 * 1037 */ 1038 1039struct isa_device *find_isadev(table, driverp, unit) 1040 struct isa_device *table; 1041 struct isa_driver *driverp; 1042 int unit; 1043{ 1044 if (driverp == NULL) /* sanity check */ 1045 return (NULL); 1046 1047 while ((table->id_driver != driverp) || (table->id_unit != unit)) { 1048 if (table->id_driver == 0) 1049 return NULL; 1050 1051 table++; 1052 } 1053 1054 return (table); 1055} 1056