isa.c revision 40565
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 1.115 1998/10/13 08:24:38 dg 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 /* 141 * Check for device driver & unit conflict; just drop probing 142 * a device which has already probed true. This is usually 143 * not strictly a conflict, but rather the case of somebody 144 * having specified several mutually exclusive configurations 145 * for a single device. 146 */ 147 if (tmpdvp->id_driver == dvp->id_driver && 148 tmpdvp->id_unit == dvp->id_unit) { 149 return 1; 150 } 151 152 whatnot = checkbits & CC_ATTACH ? "attach" : "prob"; 153 /* 154 * Check for I/O address conflict. We can only check the 155 * starting address of the device against the range of the 156 * device that has already been probed since we do not 157 * know how many I/O addresses this device uses. 158 */ 159 if (checkbits & CC_IOADDR && tmpdvp->id_alive != -1) { 160 if ((dvp->id_iobase >= tmpdvp->id_iobase) && 161 (dvp->id_iobase <= 162 (tmpdvp->id_iobase + tmpdvp->id_alive - 1))) { 163 if (!(checkbits & CC_QUIET)) 164 conflict(dvp, tmpdvp, dvp->id_iobase, 165 whatnot, "I/O address", "0x%x"); 166 return 1; 167 } 168 } 169 /* 170 * Check for Memory address conflict. We can check for 171 * range overlap, but it will not catch all cases since the 172 * driver may adjust the msize paramater during probe, for 173 * now we just check that the starting address does not 174 * fall within any allocated region. 175 * XXX could add a second check after the probe for overlap, 176 * since at that time we would know the full range. 177 * XXX KERNBASE is a hack, we should have vaddr in the table! 178 */ 179 if (checkbits & CC_MEMADDR && tmpdvp->id_maddr) { 180 if ((KERNBASE + dvp->id_maddr >= tmpdvp->id_maddr) && 181 (KERNBASE + dvp->id_maddr <= 182 (tmpdvp->id_maddr + tmpdvp->id_msize - 1))) { 183 if (!(checkbits & CC_QUIET)) 184 conflict(dvp, tmpdvp, 185 (int)dvp->id_maddr, whatnot, 186 "maddr", "0x%x"); 187 return 1; 188 } 189 } 190 /* 191 * Check for IRQ conflicts. 192 */ 193 if (checkbits & CC_IRQ && tmpdvp->id_irq) { 194 if (tmpdvp->id_irq == dvp->id_irq) { 195 if (!(checkbits & CC_QUIET)) 196 conflict(dvp, tmpdvp, 197 ffs(dvp->id_irq) - 1, whatnot, 198 "irq", "%d"); 199 return 1; 200 } 201 } 202 /* 203 * Check for DRQ conflicts. 204 */ 205 if (checkbits & CC_DRQ && tmpdvp->id_drq != -1) { 206 if (tmpdvp->id_drq == dvp->id_drq) { 207 if (!(checkbits & CC_QUIET)) 208 conflict(dvp, tmpdvp, dvp->id_drq, 209 whatnot, "drq", "%d"); 210 return 1; 211 } 212 } 213 } 214 return 0; 215} 216 217#ifdef RESOURCE_CHECK 218#include <sys/drvresource.h> 219 220static int 221checkone (struct isa_device *dvp, int type, addr_t low, addr_t high, 222 char *resname, char *resfmt, int attaching) 223{ 224 int result = 0; 225 if (bootverbose) { 226 if (low == high) 227 printf("\tcheck %s: 0x%x\n", resname, low); 228 else 229 printf("\tcheck %s: 0x%x to 0x%x\n", 230 resname, low, high); 231 } 232 if (resource_check(type, RESF_NONE, low, high) != NULL) { 233 char *whatnot = attaching ? "attach" : "prob"; 234 static struct isa_device dummydev; 235 static struct isa_driver dummydrv; 236 struct isa_device *tmpdvp = &dummydev; 237 238 dummydev.id_driver = &dummydrv; 239 dummydev.id_unit = 0; 240 dummydrv.name = "pci"; 241 conflict(dvp, tmpdvp, low, whatnot, resname, resfmt); 242 result = 1; 243 } else if (attaching) { 244 if (low == high) 245 printf("\tregister %s: 0x%x\n", resname, low); 246 else 247 printf("\tregister %s: 0x%x to 0x%x\n", 248 resname, low, high); 249 resource_claim(dvp, type, RESF_NONE, low, high); 250 } 251 return (result); 252} 253 254static int 255check_pciconflict(struct isa_device *dvp, int checkbits) 256{ 257 int result = 0; 258 int attaching = (checkbits & CC_ATTACH) != 0; 259 260 if (checkbits & CC_MEMADDR) { 261 long maddr = dvp->id_maddr; 262 long msize = dvp->id_msize; 263 if (msize > 0) { 264 if (checkone(dvp, REST_MEM, maddr, maddr + msize - 1, 265 "maddr", "0x%x", attaching) != 0) { 266 result = 1; 267 attaching = 0; 268 } 269 } 270 } 271 if (checkbits & CC_IOADDR) { 272 unsigned iobase = dvp->id_iobase; 273 unsigned iosize = dvp->id_alive; 274 if (iosize == -1) 275 iosize = 1; /* XXX can't do much about this ... */ 276 if (iosize > 0) { 277 if (checkone(dvp, REST_PORT, iobase, iobase + iosize -1, 278 "I/O address", "0x%x", attaching) != 0) { 279 result = 1; 280 attaching = 0; 281 } 282 } 283 } 284 if (checkbits & CC_IRQ) { 285 int irq = ffs(dvp->id_irq) - 1; 286 if (irq >= 0) { 287 if (checkone(dvp, REST_INT, irq, irq, 288 "irq", "%d", attaching) != 0) { 289 result = 1; 290 attaching = 0; 291 } 292 } 293 } 294 if (checkbits & CC_DRQ) { 295 int drq = dvp->id_drq; 296 if (drq >= 0) { 297 if (checkone(dvp, REST_DMA, drq, drq, 298 "drq", "%d", attaching) != 0) { 299 result = 1; 300 attaching = 0; 301 } 302 } 303 } 304 if (result != 0) 305 resource_free (dvp); 306 return (result); 307} 308#endif /* RESOURCE_CHECK */ 309 310/* 311 * Search through all the isa_devtab_* tables looking for anything that 312 * conflicts with the current device. 313 */ 314int 315haveseen_isadev(dvp, checkbits) 316 struct isa_device *dvp; 317 u_int checkbits; 318{ 319#if NPNP > 0 320 struct pnp_dlist_node *nod; 321#endif 322 struct isa_device *tmpdvp; 323 int status = 0; 324 325 for (tmpdvp = isa_devtab_tty; tmpdvp->id_driver; tmpdvp++) { 326 status |= haveseen(dvp, tmpdvp, checkbits); 327 if (status) 328 return status; 329 } 330 for (tmpdvp = isa_devtab_bio; tmpdvp->id_driver; tmpdvp++) { 331 status |= haveseen(dvp, tmpdvp, checkbits); 332 if (status) 333 return status; 334 } 335 for (tmpdvp = isa_devtab_net; tmpdvp->id_driver; tmpdvp++) { 336 status |= haveseen(dvp, tmpdvp, checkbits); 337 if (status) 338 return status; 339 } 340 for (tmpdvp = isa_devtab_cam; tmpdvp->id_driver; tmpdvp++) { 341 status |= haveseen(dvp, tmpdvp, checkbits); 342 if (status) 343 return status; 344 } 345 for (tmpdvp = isa_devtab_null; tmpdvp->id_driver; tmpdvp++) { 346 status |= haveseen(dvp, tmpdvp, checkbits); 347 if (status) 348 return status; 349 } 350#if NPNP > 0 351 for (nod = pnp_device_list; nod != NULL; nod = nod->next) 352 if (status |= haveseen(dvp, &(nod->dev), checkbits)) 353 return status; 354#endif 355#ifdef RESOURCE_CHECK 356 if (!dvp->id_conflicts) 357 status = check_pciconflict(dvp, checkbits); 358 else if (bootverbose) 359 printf("\tnot checking for resource conflicts ...\n"); 360#endif /* RESOURCE_CHECK */ 361 return(status); 362} 363 364/* 365 * Configure all ISA devices 366 */ 367void 368isa_configure() 369{ 370 struct isa_device *dvp; 371 372 printf("Probing for devices on the ISA bus:\n"); 373 /* First probe all the sensitive probes */ 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 /* Then all the bad ones */ 391 for (dvp = isa_devtab_tty; dvp->id_driver; dvp++) 392 if (!dvp->id_driver->sensitive_hw) 393 config_isadev(dvp, &tty_imask); 394 for (dvp = isa_devtab_bio; dvp->id_driver; dvp++) 395 if (!dvp->id_driver->sensitive_hw) 396 config_isadev(dvp, &bio_imask); 397 for (dvp = isa_devtab_net; dvp->id_driver; dvp++) 398 if (!dvp->id_driver->sensitive_hw) 399 config_isadev(dvp, &net_imask); 400 for (dvp = isa_devtab_cam; dvp->id_driver; dvp++) 401 if (!dvp->id_driver->sensitive_hw) 402 config_isadev(dvp, &cam_imask); 403 for (dvp = isa_devtab_null; dvp->id_driver; dvp++) 404 if (!dvp->id_driver->sensitive_hw) 405 config_isadev(dvp, (u_int *)NULL); 406 407 bio_imask |= SWI_CLOCK_MASK; 408 net_imask |= SWI_NET_MASK; 409 tty_imask |= SWI_TTY_MASK; 410 411/* 412 * XXX we should really add the tty device to net_imask when the line is 413 * switched to SLIPDISC, and then remove it when it is switched away from 414 * SLIPDISC. No need to block out ALL ttys during a splimp when only one 415 * of them is running slip. 416 * 417 * XXX actually, blocking all ttys during a splimp doesn't matter so much 418 * with sio because the serial interrupt layer doesn't use tty_imask. Only 419 * non-serial ttys suffer. It's more stupid that ALL 'net's are blocked 420 * during spltty. 421 */ 422#include "sl.h" 423#if NSL > 0 424 net_imask |= tty_imask; 425 tty_imask = net_imask; 426#endif 427 428 /* bio_imask |= tty_imask ; can some tty devices use buffers? */ 429 430 if (bootverbose) 431 printf("imasks: bio %x, tty %x, net %x\n", 432 bio_imask, tty_imask, net_imask); 433 434 /* 435 * Finish initializing intr_mask[]. Note that the partly 436 * constructed masks aren't actually used since we're at splhigh. 437 * For fully dynamic initialization, register_intr() and 438 * icu_unset() will have to adjust the masks for _all_ 439 * interrupts and for tty_imask, etc. 440 */ 441 for (dvp = isa_devtab_tty; dvp->id_driver; dvp++) 442 register_imask(dvp, tty_imask); 443 for (dvp = isa_devtab_bio; dvp->id_driver; dvp++) 444 register_imask(dvp, bio_imask); 445 for (dvp = isa_devtab_net; dvp->id_driver; dvp++) 446 register_imask(dvp, net_imask); 447 for (dvp = isa_devtab_cam; dvp->id_driver; dvp++) 448 register_imask(dvp, cam_imask); 449 for (dvp = isa_devtab_null; dvp->id_driver; dvp++) 450 register_imask(dvp, SWI_CLOCK_MASK); 451} 452 453/* 454 * Configure an ISA device. 455 */ 456static void 457config_isadev(isdp, mp) 458 struct isa_device *isdp; 459 u_int *mp; 460{ 461 config_isadev_c(isdp, mp, 0); 462} 463 464void 465reconfig_isadev(isdp, mp) 466 struct isa_device *isdp; 467 u_int *mp; 468{ 469 config_isadev_c(isdp, mp, 1); 470} 471 472static void 473config_isadev_c(isdp, mp, reconfig) 474 struct isa_device *isdp; 475 u_int *mp; 476 int reconfig; 477{ 478 u_int checkbits; 479 int id_alive; 480 int last_alive; 481 struct isa_driver *dp = isdp->id_driver; 482 483 if (!isdp->id_enabled) { 484 if (bootverbose) 485 printf("%s%d: disabled, not probed.\n", dp->name, isdp->id_unit); 486 return; 487 } 488 checkbits = CC_DRQ | CC_IOADDR | CC_MEMADDR; 489 if (!reconfig && haveseen_isadev(isdp, checkbits)) 490 return; 491 if (!reconfig && isdp->id_maddr) { 492 isdp->id_maddr -= ISA_HOLE_START; 493 isdp->id_maddr += atdevbase; 494 } 495 if (reconfig) { 496 last_alive = isdp->id_alive; 497 isdp->id_reconfig = 1; 498 } 499 else { 500 last_alive = 0; 501 isdp->id_reconfig = 0; 502 } 503 id_alive = (*dp->probe)(isdp); 504 if (id_alive) { 505 /* 506 * Only print the I/O address range if id_alive != -1 507 * Right now this is a temporary fix just for the new 508 * NPX code so that if it finds a 486 that can use trap 509 * 16 it will not report I/O addresses. 510 * Rod Grimes 04/26/94 511 */ 512 if (!isdp->id_reconfig) { 513 printf("%s%d", dp->name, isdp->id_unit); 514 if (id_alive != -1) { 515 if (isdp->id_iobase == -1) 516 printf(" at ?"); 517 else { 518 printf(" at 0x%x", isdp->id_iobase); 519 if (isdp->id_iobase + id_alive - 1 != 520 isdp->id_iobase) { 521 printf("-0x%x", 522 isdp->id_iobase + id_alive - 1); 523 } 524 } 525 } 526 if (isdp->id_irq) 527 printf(" irq %d", ffs(isdp->id_irq) - 1); 528 if (isdp->id_drq != -1) 529 printf(" drq %d", isdp->id_drq); 530 if (isdp->id_maddr) 531 printf(" maddr 0x%lx", kvtop(isdp->id_maddr)); 532 if (isdp->id_msize) 533 printf(" msize %d", isdp->id_msize); 534 if (isdp->id_flags) 535 printf(" flags 0x%x", isdp->id_flags); 536 if (isdp->id_iobase && !(isdp->id_iobase & 0xf300)) { 537 printf(" on motherboard"); 538 } else if (isdp->id_iobase >= 0x1000 && 539 !(isdp->id_iobase & 0x300)) { 540 printf (" on eisa slot %d", 541 isdp->id_iobase >> 12); 542 } else { 543 printf (" on isa"); 544 } 545 printf("\n"); 546 /* 547 * Check for conflicts again. The driver may have 548 * changed *dvp. We should weaken the early check 549 * since the driver may have been able to change 550 * *dvp to avoid conflicts if given a chance. We 551 * already skip the early check for IRQs and force 552 * a check for IRQs in the next group of checks. 553 */ 554 checkbits |= CC_ATTACH | CC_IRQ; 555 if (haveseen_isadev(isdp, checkbits)) 556 return; 557 isdp->id_alive = id_alive; 558 } 559 (*dp->attach)(isdp); 560 if (isdp->id_irq != 0 && isdp->id_intr == NULL) 561 printf("%s%d: irq with no handler\n", 562 dp->name, isdp->id_unit); 563 if (isdp->id_irq != 0 && isdp->id_intr != NULL) { 564#ifdef APIC_IO 565 /* 566 * Some motherboards use upper IRQs for traditional 567 * ISA INTerrupt sources. In particular we have 568 * seen the secondary IDE connected to IRQ20. 569 * This code detects and fixes this situation. 570 */ 571 u_int apic_mask; 572 int rirq; 573 574 apic_mask = isa_apic_mask(isdp->id_irq); 575 if (apic_mask != isdp->id_irq) { 576 rirq = ffs(isdp->id_irq) - 1; 577 isdp->id_irq = apic_mask; 578 undirect_isa_irq(rirq); /* free for ISA */ 579 } 580#endif /* APIC_IO */ 581 register_intr(ffs(isdp->id_irq) - 1, isdp->id_id, 582 isdp->id_ri_flags, isdp->id_intr, 583 mp, isdp->id_unit); 584 } 585 } else { 586 if (isdp->id_reconfig) { 587 (*dp->attach)(isdp); /* reconfiguration attach */ 588 } 589 if (!last_alive) { 590 if (!isdp->id_reconfig) { 591 printf("%s%d not found", 592 dp->name, isdp->id_unit); 593 if (isdp->id_iobase != -1) 594 printf(" at 0x%x", isdp->id_iobase); 595 printf("\n"); 596 } 597 } else { 598#if 0 599 /* This code has not been tested.... */ 600 if (isdp->id_irq != 0 && isdp->id_intr != NULL) { 601 icu_unset(ffs(isdp->id_irq) - 1, 602 isdp->id_intr); 603 if (mp) 604 INTRUNMASK(*mp, isdp->id_irq); 605 } 606#else 607 printf ("icu_unset() not supported here ...\n"); 608#endif 609 } 610 } 611} 612 613static caddr_t dma_bouncebuf[8]; 614static u_int dma_bouncebufsize[8]; 615static u_int8_t dma_bounced = 0; 616static u_int8_t dma_busy = 0; /* Used in isa_dmastart() */ 617static u_int8_t dma_inuse = 0; /* User for acquire/release */ 618static u_int8_t dma_auto_mode = 0; 619 620#define VALID_DMA_MASK (7) 621 622/* high byte of address is stored in this port for i-th dma channel */ 623static int dmapageport[8] = { 0x87, 0x83, 0x81, 0x82, 0x8f, 0x8b, 0x89, 0x8a }; 624 625/* 626 * Setup a DMA channel's bounce buffer. 627 */ 628void 629isa_dmainit(chan, bouncebufsize) 630 int chan; 631 u_int bouncebufsize; 632{ 633 void *buf; 634 635#ifdef DIAGNOSTIC 636 if (chan & ~VALID_DMA_MASK) 637 panic("isa_dmainit: channel out of range"); 638 639 if (dma_bouncebuf[chan] != NULL) 640 panic("isa_dmainit: impossible request"); 641#endif 642 643 dma_bouncebufsize[chan] = bouncebufsize; 644 645 /* Try malloc() first. It works better if it works. */ 646 buf = malloc(bouncebufsize, M_DEVBUF, M_NOWAIT); 647 if (buf != NULL) { 648 if (isa_dmarangecheck(buf, bouncebufsize, chan) == 0) { 649 dma_bouncebuf[chan] = buf; 650 return; 651 } 652 free(buf, M_DEVBUF); 653 } 654 buf = contigmalloc(bouncebufsize, M_DEVBUF, M_NOWAIT, 0ul, 0xfffffful, 655 1ul, chan & 4 ? 0x20000ul : 0x10000ul); 656 if (buf == NULL) 657 printf("isa_dmainit(%d, %d) failed\n", chan, bouncebufsize); 658 else 659 dma_bouncebuf[chan] = buf; 660} 661 662/* 663 * Register a DMA channel's usage. Usually called from a device driver 664 * in open() or during its initialization. 665 */ 666int 667isa_dma_acquire(chan) 668 int chan; 669{ 670#ifdef DIAGNOSTIC 671 if (chan & ~VALID_DMA_MASK) 672 panic("isa_dma_acquire: channel out of range"); 673#endif 674 675 if (dma_inuse & (1 << chan)) { 676 printf("isa_dma_acquire: channel %d already in use\n", chan); 677 return (EBUSY); 678 } 679 dma_inuse |= (1 << chan); 680 dma_auto_mode &= ~(1 << chan); 681 682 return (0); 683} 684 685/* 686 * Unregister a DMA channel's usage. Usually called from a device driver 687 * during close() or during its shutdown. 688 */ 689void 690isa_dma_release(chan) 691 int chan; 692{ 693#ifdef DIAGNOSTIC 694 if (chan & ~VALID_DMA_MASK) 695 panic("isa_dma_release: channel out of range"); 696 697 if ((dma_inuse & (1 << chan)) == 0) 698 printf("isa_dma_release: channel %d not in use\n", chan); 699#endif 700 701 if (dma_busy & (1 << chan)) { 702 dma_busy &= ~(1 << chan); 703 /* 704 * XXX We should also do "dma_bounced &= (1 << chan);" 705 * because we are acting on behalf of isa_dmadone() which 706 * was not called to end the last DMA operation. This does 707 * not matter now, but it may in the future. 708 */ 709 } 710 711 dma_inuse &= ~(1 << chan); 712 dma_auto_mode &= ~(1 << chan); 713} 714 715/* 716 * isa_dmacascade(): program 8237 DMA controller channel to accept 717 * external dma control by a board. 718 */ 719void 720isa_dmacascade(chan) 721 int chan; 722{ 723#ifdef DIAGNOSTIC 724 if (chan & ~VALID_DMA_MASK) 725 panic("isa_dmacascade: channel out of range"); 726#endif 727 728 /* set dma channel mode, and set dma channel mode */ 729 if ((chan & 4) == 0) { 730 outb(DMA1_MODE, DMA37MD_CASCADE | chan); 731 outb(DMA1_SMSK, chan); 732 } else { 733 outb(DMA2_MODE, DMA37MD_CASCADE | (chan & 3)); 734 outb(DMA2_SMSK, chan & 3); 735 } 736} 737 738/* 739 * isa_dmastart(): program 8237 DMA controller channel, avoid page alignment 740 * problems by using a bounce buffer. 741 */ 742void 743isa_dmastart(int flags, caddr_t addr, u_int nbytes, int chan) 744{ 745 vm_offset_t phys; 746 int waport; 747 caddr_t newaddr; 748 749#ifdef DIAGNOSTIC 750 if (chan & ~VALID_DMA_MASK) 751 panic("isa_dmastart: channel out of range"); 752 753 if ((chan < 4 && nbytes > (1<<16)) 754 || (chan >= 4 && (nbytes > (1<<17) || (u_int)addr & 1))) 755 panic("isa_dmastart: impossible request"); 756 757 if ((dma_inuse & (1 << chan)) == 0) 758 printf("isa_dmastart: channel %d not acquired\n", chan); 759#endif 760 761#if 0 762 /* 763 * XXX This should be checked, but drivers like ad1848 only call 764 * isa_dmastart() once because they use Auto DMA mode. If we 765 * leave this in, drivers that do this will print this continuously. 766 */ 767 if (dma_busy & (1 << chan)) 768 printf("isa_dmastart: channel %d busy\n", chan); 769#endif 770 771 dma_busy |= (1 << chan); 772 773 if (isa_dmarangecheck(addr, nbytes, chan)) { 774 if (dma_bouncebuf[chan] == NULL 775 || dma_bouncebufsize[chan] < nbytes) 776 panic("isa_dmastart: bad bounce buffer"); 777 dma_bounced |= (1 << chan); 778 newaddr = dma_bouncebuf[chan]; 779 780 /* copy bounce buffer on write */ 781 if (!(flags & B_READ)) 782 bcopy(addr, newaddr, nbytes); 783 addr = newaddr; 784 } 785 786 /* translate to physical */ 787 phys = pmap_extract(pmap_kernel(), (vm_offset_t)addr); 788 789 if (flags & B_RAW) { 790 dma_auto_mode |= (1 << chan); 791 } else { 792 dma_auto_mode &= ~(1 << chan); 793 } 794 795 if ((chan & 4) == 0) { 796 /* 797 * Program one of DMA channels 0..3. These are 798 * byte mode channels. 799 */ 800 /* set dma channel mode, and reset address ff */ 801 802 /* If B_RAW flag is set, then use autoinitialise mode */ 803 if (flags & B_RAW) { 804 if (flags & B_READ) 805 outb(DMA1_MODE, DMA37MD_AUTO|DMA37MD_WRITE|chan); 806 else 807 outb(DMA1_MODE, DMA37MD_AUTO|DMA37MD_READ|chan); 808 } 809 else 810 if (flags & B_READ) 811 outb(DMA1_MODE, DMA37MD_SINGLE|DMA37MD_WRITE|chan); 812 else 813 outb(DMA1_MODE, DMA37MD_SINGLE|DMA37MD_READ|chan); 814 outb(DMA1_FFC, 0); 815 816 /* send start address */ 817 waport = DMA1_CHN(chan); 818 outb(waport, phys); 819 outb(waport, phys>>8); 820 outb(dmapageport[chan], phys>>16); 821 822 /* send count */ 823 outb(waport + 1, --nbytes); 824 outb(waport + 1, nbytes>>8); 825 826 /* unmask channel */ 827 outb(DMA1_SMSK, chan); 828 } else { 829 /* 830 * Program one of DMA channels 4..7. These are 831 * word mode channels. 832 */ 833 /* set dma channel mode, and reset address ff */ 834 835 /* If B_RAW flag is set, then use autoinitialise mode */ 836 if (flags & B_RAW) { 837 if (flags & B_READ) 838 outb(DMA2_MODE, DMA37MD_AUTO|DMA37MD_WRITE|(chan&3)); 839 else 840 outb(DMA2_MODE, DMA37MD_AUTO|DMA37MD_READ|(chan&3)); 841 } 842 else 843 if (flags & B_READ) 844 outb(DMA2_MODE, DMA37MD_SINGLE|DMA37MD_WRITE|(chan&3)); 845 else 846 outb(DMA2_MODE, DMA37MD_SINGLE|DMA37MD_READ|(chan&3)); 847 outb(DMA2_FFC, 0); 848 849 /* send start address */ 850 waport = DMA2_CHN(chan - 4); 851 outb(waport, phys>>1); 852 outb(waport, phys>>9); 853 outb(dmapageport[chan], phys>>16); 854 855 /* send count */ 856 nbytes >>= 1; 857 outb(waport + 2, --nbytes); 858 outb(waport + 2, nbytes>>8); 859 860 /* unmask channel */ 861 outb(DMA2_SMSK, chan & 3); 862 } 863} 864 865void 866isa_dmadone(int flags, caddr_t addr, int nbytes, int chan) 867{ 868#ifdef DIAGNOSTIC 869 if (chan & ~VALID_DMA_MASK) 870 panic("isa_dmadone: channel out of range"); 871 872 if ((dma_inuse & (1 << chan)) == 0) 873 printf("isa_dmadone: channel %d not acquired\n", chan); 874#endif 875 876 if (((dma_busy & (1 << chan)) == 0) && 877 (dma_auto_mode & (1 << chan)) == 0 ) 878 printf("isa_dmadone: channel %d not busy\n", chan); 879 880 if ((dma_auto_mode & (1 << chan)) == 0) 881 outb(chan & 4 ? DMA2_SMSK : DMA1_SMSK, (chan & 3) | 4); 882 883 if (dma_bounced & (1 << chan)) { 884 /* copy bounce buffer on read */ 885 if (flags & B_READ) 886 bcopy(dma_bouncebuf[chan], addr, nbytes); 887 888 dma_bounced &= ~(1 << chan); 889 } 890 dma_busy &= ~(1 << chan); 891} 892 893/* 894 * Check for problems with the address range of a DMA transfer 895 * (non-contiguous physical pages, outside of bus address space, 896 * crossing DMA page boundaries). 897 * Return true if special handling needed. 898 */ 899 900static int 901isa_dmarangecheck(caddr_t va, u_int length, int chan) 902{ 903 vm_offset_t phys, priorpage = 0, endva; 904 u_int dma_pgmsk = (chan & 4) ? ~(128*1024-1) : ~(64*1024-1); 905 906 endva = (vm_offset_t)round_page((vm_offset_t)va + length); 907 for (; va < (caddr_t) endva ; va += PAGE_SIZE) { 908 phys = trunc_page(pmap_extract(pmap_kernel(), (vm_offset_t)va)); 909#define ISARAM_END RAM_END 910 if (phys == 0) 911 panic("isa_dmacheck: no physical page present"); 912 if (phys >= ISARAM_END) 913 return (1); 914 if (priorpage) { 915 if (priorpage + PAGE_SIZE != phys) 916 return (1); 917 /* check if crossing a DMA page boundary */ 918 if (((u_int)priorpage ^ (u_int)phys) & dma_pgmsk) 919 return (1); 920 } 921 priorpage = phys; 922 } 923 return (0); 924} 925 926/* 927 * Query the progress of a transfer on a DMA channel. 928 * 929 * To avoid having to interrupt a transfer in progress, we sample 930 * each of the high and low databytes twice, and apply the following 931 * logic to determine the correct count. 932 * 933 * Reads are performed with interrupts disabled, thus it is to be 934 * expected that the time between reads is very small. At most 935 * one rollover in the low count byte can be expected within the 936 * four reads that are performed. 937 * 938 * There are three gaps in which a rollover can occur : 939 * 940 * - read low1 941 * gap1 942 * - read high1 943 * gap2 944 * - read low2 945 * gap3 946 * - read high2 947 * 948 * If a rollover occurs in gap1 or gap2, the low2 value will be 949 * greater than the low1 value. In this case, low2 and high2 are a 950 * corresponding pair. 951 * 952 * In any other case, low1 and high1 can be considered to be correct. 953 * 954 * The function returns the number of bytes remaining in the transfer, 955 * or -1 if the channel requested is not active. 956 * 957 */ 958int 959isa_dmastatus(int chan) 960{ 961 u_long cnt = 0; 962 int ffport, waport; 963 u_long low1, high1, low2, high2; 964 965 /* channel active? */ 966 if ((dma_inuse & (1 << chan)) == 0) { 967 printf("isa_dmastatus: channel %d not active\n", chan); 968 return(-1); 969 } 970 /* channel busy? */ 971 972 if (((dma_busy & (1 << chan)) == 0) && 973 (dma_auto_mode & (1 << chan)) == 0 ) { 974 printf("chan %d not busy\n", chan); 975 return -2 ; 976 } 977 if (chan < 4) { /* low DMA controller */ 978 ffport = DMA1_FFC; 979 waport = DMA1_CHN(chan) + 1; 980 } else { /* high DMA controller */ 981 ffport = DMA2_FFC; 982 waport = DMA2_CHN(chan - 4) + 2; 983 } 984 985 disable_intr(); /* no interrupts Mr Jones! */ 986 outb(ffport, 0); /* clear register LSB flipflop */ 987 low1 = inb(waport); 988 high1 = inb(waport); 989 outb(ffport, 0); /* clear again */ 990 low2 = inb(waport); 991 high2 = inb(waport); 992 enable_intr(); /* enable interrupts again */ 993 994 /* 995 * Now decide if a wrap has tried to skew our results. 996 * Note that after TC, the count will read 0xffff, while we want 997 * to return zero, so we add and then mask to compensate. 998 */ 999 if (low1 >= low2) { 1000 cnt = (low1 + (high1 << 8) + 1) & 0xffff; 1001 } else { 1002 cnt = (low2 + (high2 << 8) + 1) & 0xffff; 1003 } 1004 1005 if (chan >= 4) /* high channels move words */ 1006 cnt *= 2; 1007 return(cnt); 1008} 1009 1010/* 1011 * Stop a DMA transfer currently in progress. 1012 */ 1013int 1014isa_dmastop(int chan) 1015{ 1016 if ((dma_inuse & (1 << chan)) == 0) 1017 printf("isa_dmastop: channel %d not acquired\n", chan); 1018 1019 if (((dma_busy & (1 << chan)) == 0) && 1020 ((dma_auto_mode & (1 << chan)) == 0)) { 1021 printf("chan %d not busy\n", chan); 1022 return -2 ; 1023 } 1024 1025 if ((chan & 4) == 0) { 1026 outb(DMA1_SMSK, (chan & 3) | 4 /* disable mask */); 1027 } else { 1028 outb(DMA2_SMSK, (chan & 3) | 4 /* disable mask */); 1029 } 1030 return(isa_dmastatus(chan)); 1031} 1032 1033/* 1034 * Find the highest priority enabled display device. Since we can't 1035 * distinguish display devices from ttys, depend on display devices 1036 * being sensitive and before sensitive non-display devices (if any) 1037 * in isa_devtab_tty. 1038 * 1039 * XXX we should add capability flags IAMDISPLAY and ISUPPORTCONSOLES. 1040 */ 1041struct isa_device * 1042find_display() 1043{ 1044 struct isa_device *dvp; 1045 1046 for (dvp = isa_devtab_tty; dvp->id_driver != NULL; dvp++) 1047 if (dvp->id_driver->sensitive_hw && dvp->id_enabled) 1048 return (dvp); 1049 return (NULL); 1050} 1051 1052/* 1053 * find an ISA device in a given isa_devtab_* table, given 1054 * the table to search, the expected id_driver entry, and the unit number. 1055 * 1056 * this function is defined in isa_device.h, and this location is debatable; 1057 * i put it there because it's useless w/o, and directly operates on 1058 * the other stuff in that file. 1059 * 1060 */ 1061 1062struct isa_device * 1063find_isadev(table, driverp, unit) 1064 struct isa_device *table; 1065 struct isa_driver *driverp; 1066 int unit; 1067{ 1068 if (driverp == NULL) /* sanity check */ 1069 return (NULL); 1070 1071 while ((table->id_driver != driverp) || (table->id_unit != unit)) { 1072 if (table->id_driver == 0) 1073 return NULL; 1074 1075 table++; 1076 } 1077 1078 return (table); 1079} 1080