isa.c revision 3869
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 1.32 1994/10/23 21:27:26 wollman 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> /* isn't it a joy */ 52#include <sys/kernel.h> /* to have three of these */ 53#include <sys/conf.h> 54#include <sys/file.h> 55#include <sys/buf.h> 56#include <sys/uio.h> 57#include <sys/syslog.h> 58#include <sys/malloc.h> 59#include <sys/rlist.h> 60#include <machine/segments.h> 61#include <vm/vm.h> 62#include <machine/spl.h> 63#include <i386/isa/isa_device.h> 64#include <i386/isa/isa.h> 65#include <i386/isa/icu.h> 66#include <i386/isa/ic/i8237.h> 67#include <i386/isa/ic/i8042.h> 68#include <sys/devconf.h> 69#include "vector.h" 70 71/* 72** Register definitions for DMA controller 1 (channels 0..3): 73*/ 74#define DMA1_CHN(c) (IO_DMA1 + 1*(2*(c))) /* addr reg for channel c */ 75#define DMA1_SMSK (IO_DMA1 + 1*10) /* single mask register */ 76#define DMA1_MODE (IO_DMA1 + 1*11) /* mode register */ 77#define DMA1_FFC (IO_DMA1 + 1*12) /* clear first/last FF */ 78 79/* 80** Register definitions for DMA controller 2 (channels 4..7): 81*/ 82#define DMA2_CHN(c) (IO_DMA2 + 2*(2*(c))) /* addr reg for channel c */ 83#define DMA2_SMSK (IO_DMA2 + 2*10) /* single mask register */ 84#define DMA2_MODE (IO_DMA2 + 2*11) /* mode register */ 85#define DMA2_FFC (IO_DMA2 + 2*12) /* clear first/last FF */ 86 87/* 88 * Bits to specify the type and amount of conflict checking. 89 */ 90#define CC_ATTACH (1 << 0) 91#define CC_DRQ (1 << 1) 92#define CC_IOADDR (1 << 2) 93#define CC_IRQ (1 << 3) 94#define CC_MEMADDR (1 << 4) 95 96/* 97 * XXX these defines should be in a central place. 98 */ 99#define read_eflags() ({u_long ef; \ 100 __asm("pushfl; popl %0" : "=a" (ef)); \ 101 ef; }) 102#define write_eflags(ef) __asm("pushl %0; popfl" : : "a" ((u_long)(ef))) 103 104u_long *intr_countp[ICU_LEN]; 105inthand2_t *intr_handler[ICU_LEN]; 106u_int intr_mask[ICU_LEN]; 107int intr_unit[ICU_LEN]; 108 109struct kern_devconf kdc_isa0 = { 110 0, 0, 0, /* filled in by dev_attach */ 111 "isa", 0, { MDDT_BUS, 0 }, 112 0, 0, 0, BUS_EXTERNALLEN, 113 0, /* no parent yet; parent should be CPU */ 114 0, /* no parentdata */ 115 DC_BUSY, /* busses are always busy */ 116 "ISA or EISA bus" 117}; 118 119static inthand_t *fastintr[ICU_LEN] = { 120 &IDTVEC(fastintr0), &IDTVEC(fastintr1), 121 &IDTVEC(fastintr2), &IDTVEC(fastintr3), 122 &IDTVEC(fastintr4), &IDTVEC(fastintr5), 123 &IDTVEC(fastintr6), &IDTVEC(fastintr7), 124 &IDTVEC(fastintr8), &IDTVEC(fastintr9), 125 &IDTVEC(fastintr10), &IDTVEC(fastintr11), 126 &IDTVEC(fastintr12), &IDTVEC(fastintr13), 127 &IDTVEC(fastintr14), &IDTVEC(fastintr15) 128}; 129 130static inthand_t *slowintr[ICU_LEN] = { 131 &IDTVEC(intr0), &IDTVEC(intr1), &IDTVEC(intr2), &IDTVEC(intr3), 132 &IDTVEC(intr4), &IDTVEC(intr5), &IDTVEC(intr6), &IDTVEC(intr7), 133 &IDTVEC(intr8), &IDTVEC(intr9), &IDTVEC(intr10), &IDTVEC(intr11), 134 &IDTVEC(intr12), &IDTVEC(intr13), &IDTVEC(intr14), &IDTVEC(intr15) 135}; 136 137static void config_isadev __P((struct isa_device *isdp, u_int *mp)); 138static void conflict __P((struct isa_device *dvp, struct isa_device *tmpdvp, 139 int item, char const *whatnot, char const *reason, 140 char const *format)); 141static int haveseen __P((struct isa_device *dvp, struct isa_device *tmpdvp, 142 u_int checkbits)); 143static int haveseen_isadev __P((struct isa_device *dvp, u_int checkbits)); 144static inthand2_t isa_strayintr; 145static void register_imask __P((struct isa_device *dvp, u_int mask)); 146 147/* 148 * print a conflict message 149 */ 150static void 151conflict(dvp, tmpdvp, item, whatnot, reason, format) 152 struct isa_device *dvp; 153 struct isa_device *tmpdvp; 154 int item; 155 char const *whatnot; 156 char const *reason; 157 char const *format; 158{ 159 printf("%s%d not %sed due to %s conflict with %s%d at ", 160 dvp->id_driver->name, dvp->id_unit, whatnot, reason, 161 tmpdvp->id_driver->name, tmpdvp->id_unit); 162 printf(format, item); 163 printf("\n"); 164} 165 166/* 167 * Check to see if things are alread in use, like IRQ's, I/O addresses 168 * and Memory addresses. 169 */ 170static int 171haveseen(dvp, tmpdvp, checkbits) 172 struct isa_device *dvp; 173 struct isa_device *tmpdvp; 174 u_int checkbits; 175{ 176 /* 177 * Only check against devices that have already been found 178 */ 179 if (tmpdvp->id_alive) { 180 char const *whatnot; 181 182 whatnot = checkbits & CC_ATTACH ? "attach" : "prob"; 183 /* 184 * Check for I/O address conflict. We can only check the 185 * starting address of the device against the range of the 186 * device that has already been probed since we do not 187 * know how many I/O addresses this device uses. 188 */ 189 if (checkbits & CC_IOADDR && tmpdvp->id_alive != -1) { 190 if ((dvp->id_iobase >= tmpdvp->id_iobase) && 191 (dvp->id_iobase <= 192 (tmpdvp->id_iobase + tmpdvp->id_alive - 1))) { 193 conflict(dvp, tmpdvp, dvp->id_iobase, whatnot, 194 "I/O address", "0x%x"); 195 return 1; 196 } 197 } 198 /* 199 * Check for Memory address conflict. We can check for 200 * range overlap, but it will not catch all cases since the 201 * driver may adjust the msize paramater during probe, for 202 * now we just check that the starting address does not 203 * fall within any allocated region. 204 * XXX could add a second check after the probe for overlap, 205 * since at that time we would know the full range. 206 * XXX KERNBASE is a hack, we should have vaddr in the table! 207 */ 208 if (checkbits & CC_MEMADDR && tmpdvp->id_maddr) { 209 if ((KERNBASE + dvp->id_maddr >= tmpdvp->id_maddr) && 210 (KERNBASE + dvp->id_maddr <= 211 (tmpdvp->id_maddr + tmpdvp->id_msize - 1))) { 212 conflict(dvp, tmpdvp, (int)dvp->id_maddr, 213 whatnot, "maddr", "0x%x"); 214 return 1; 215 } 216 } 217 /* 218 * Check for IRQ conflicts. 219 */ 220 if (checkbits & CC_IRQ && tmpdvp->id_irq) { 221 if (tmpdvp->id_irq == dvp->id_irq) { 222 conflict(dvp, tmpdvp, ffs(dvp->id_irq) - 1, 223 whatnot, "irq", "%d"); 224 return 1; 225 } 226 } 227 /* 228 * Check for DRQ conflicts. 229 */ 230 if (checkbits & CC_DRQ && tmpdvp->id_drq != -1) { 231 if (tmpdvp->id_drq == dvp->id_drq) { 232 conflict(dvp, tmpdvp, dvp->id_drq, whatnot, 233 "drq", "%d"); 234 return 1; 235 } 236 } 237 } 238 return 0; 239} 240 241/* 242 * Search through all the isa_devtab_* tables looking for anything that 243 * conflicts with the current device. 244 */ 245static int 246haveseen_isadev(dvp, checkbits) 247 struct isa_device *dvp; 248 u_int checkbits; 249{ 250 struct isa_device *tmpdvp; 251 int status = 0; 252 253 for (tmpdvp = isa_devtab_tty; tmpdvp->id_driver; tmpdvp++) { 254 status |= haveseen(dvp, tmpdvp, checkbits); 255 if (status) 256 return status; 257 } 258 for (tmpdvp = isa_devtab_bio; tmpdvp->id_driver; tmpdvp++) { 259 status |= haveseen(dvp, tmpdvp, checkbits); 260 if (status) 261 return status; 262 } 263 for (tmpdvp = isa_devtab_net; tmpdvp->id_driver; tmpdvp++) { 264 status |= haveseen(dvp, tmpdvp, checkbits); 265 if (status) 266 return status; 267 } 268 for (tmpdvp = isa_devtab_null; tmpdvp->id_driver; tmpdvp++) { 269 status |= haveseen(dvp, tmpdvp, checkbits); 270 if (status) 271 return status; 272 } 273 return(status); 274} 275 276/* 277 * Configure all ISA devices 278 */ 279void 280isa_configure() { 281 struct isa_device *dvp; 282 283 dev_attach(&kdc_isa0); 284 285 splhigh(); 286 enable_intr(); 287 INTREN(IRQ_SLAVE); 288 printf("Probing for devices on the ISA bus:\n"); 289 /* First probe all the sensitive probes */ 290 for (dvp = isa_devtab_tty; dvp->id_driver; dvp++) 291 if (dvp->id_driver->sensitive_hw) 292 config_isadev(dvp, &tty_imask); 293 for (dvp = isa_devtab_bio; dvp->id_driver; dvp++) 294 if (dvp->id_driver->sensitive_hw) 295 config_isadev(dvp, &bio_imask); 296 for (dvp = isa_devtab_net; dvp->id_driver; dvp++) 297 if (dvp->id_driver->sensitive_hw) 298 config_isadev(dvp, &net_imask); 299 for (dvp = isa_devtab_null; dvp->id_driver; dvp++) 300 if (dvp->id_driver->sensitive_hw) 301 config_isadev(dvp, (u_int *)NULL); 302 303 /* Then all the bad ones */ 304 for (dvp = isa_devtab_tty; dvp->id_driver; dvp++) 305 if (!dvp->id_driver->sensitive_hw) 306 config_isadev(dvp, &tty_imask); 307 for (dvp = isa_devtab_bio; dvp->id_driver; dvp++) 308 if (!dvp->id_driver->sensitive_hw) 309 config_isadev(dvp, &bio_imask); 310 for (dvp = isa_devtab_net; dvp->id_driver; dvp++) 311 if (!dvp->id_driver->sensitive_hw) 312 config_isadev(dvp, &net_imask); 313 for (dvp = isa_devtab_null; dvp->id_driver; dvp++) 314 if (!dvp->id_driver->sensitive_hw) 315 config_isadev(dvp, (u_int *)NULL); 316 317 bio_imask |= SWI_CLOCK_MASK; 318 net_imask |= SWI_NET_MASK; 319 tty_imask |= SWI_TTY_MASK; 320 321/* 322 * XXX we should really add the tty device to net_imask when the line is 323 * switched to SLIPDISC, and then remove it when it is switched away from 324 * SLIPDISC. No need to block out ALL ttys during a splimp when only one 325 * of them is running slip. 326 * 327 * XXX actually, blocking all ttys during a splimp doesn't matter so much 328 * with sio because the serial interrupt layer doesn't use tty_imask. Only 329 * non-serial ttys suffer. It's more stupid that ALL 'net's are blocked 330 * during spltty. 331 */ 332#include "sl.h" 333#include "ppp.h" 334 335#if (NSL > 0) || (NPPP > 0) 336 net_imask |= tty_imask; 337 tty_imask = net_imask; 338#endif 339 /* bio_imask |= tty_imask ; can some tty devices use buffers? */ 340#ifdef DIAGNOSTIC 341 printf("bio_imask %x tty_imask %x net_imask %x\n", 342 bio_imask, tty_imask, net_imask); 343#endif 344 /* 345 * Finish initializing intr_mask[]. Note that the partly 346 * constructed masks aren't actually used since we're at splhigh. 347 * For fully dynamic initialization, register_intr() and 348 * unregister_intr() will have to adjust the masks for _all_ 349 * interrupts and for tty_imask, etc. 350 */ 351 for (dvp = isa_devtab_tty; dvp->id_driver; dvp++) 352 register_imask(dvp, tty_imask); 353 for (dvp = isa_devtab_bio; dvp->id_driver; dvp++) 354 register_imask(dvp, bio_imask); 355 for (dvp = isa_devtab_net; dvp->id_driver; dvp++) 356 register_imask(dvp, net_imask); 357 for (dvp = isa_devtab_null; dvp->id_driver; dvp++) 358 register_imask(dvp, SWI_CLOCK_MASK); 359 spl0(); 360} 361 362/* 363 * Configure an ISA device. 364 */ 365 366 367static void config_isadev_c(); 368 369static void 370config_isadev(isdp, mp) 371 struct isa_device *isdp; 372 u_int *mp; 373{ 374 config_isadev_c(isdp, mp, 0); 375} 376 377void 378reconfig_isadev(isdp, mp) 379 struct isa_device *isdp; 380 u_int *mp; 381{ 382 config_isadev_c(isdp, mp, 1); 383} 384 385static void 386config_isadev_c(isdp, mp, reconfig) 387 struct isa_device *isdp; 388 u_int *mp; 389 int reconfig; 390{ 391 u_int checkbits; 392 int id_alive; 393 int last_alive; 394 struct isa_driver *dp = isdp->id_driver; 395 396 checkbits = 0; 397#ifndef ALLOW_CONFLICT_DRQ 398 checkbits |= CC_DRQ; 399#endif 400#ifndef ALLOW_CONFLICT_IOADDR 401 checkbits |= CC_IOADDR; 402#endif 403#ifndef ALLOW_CONFLICT_MEMADDR 404 checkbits |= CC_MEMADDR; 405#endif 406 if (!reconfig && haveseen_isadev(isdp, checkbits)) 407 return; 408 if (!reconfig && isdp->id_maddr) { 409 isdp->id_maddr -= 0xa0000; /* XXX should be a define */ 410 isdp->id_maddr += atdevbase; 411 } 412 if (reconfig) { 413 last_alive = isdp->id_alive; 414 } 415 else { 416 last_alive = 0; 417 } 418 id_alive = (*dp->probe)(isdp); 419 if (id_alive) { 420 /* 421 * Only print the I/O address range if id_alive != -1 422 * Right now this is a temporary fix just for the new 423 * NPX code so that if it finds a 486 that can use trap 424 * 16 it will not report I/O addresses. 425 * Rod Grimes 04/26/94 426 */ 427 if (!isdp->id_reconfig) { 428 printf("%s%d", dp->name, isdp->id_unit); 429 if (id_alive != -1) { 430 printf(" at 0x%x", isdp->id_iobase); 431 if ((isdp->id_iobase + id_alive - 1) != 432 isdp->id_iobase) { 433 printf("-0x%x", 434 isdp->id_iobase + id_alive - 1); 435 } 436 } 437 if (isdp->id_irq) 438 printf(" irq %d", ffs(isdp->id_irq) - 1); 439 if (isdp->id_drq != -1) 440 printf(" drq %d", isdp->id_drq); 441 if (isdp->id_maddr) 442 printf(" maddr 0x%lx", kvtop(isdp->id_maddr)); 443 if (isdp->id_msize) 444 printf(" msize %d", isdp->id_msize); 445 if (isdp->id_flags) 446 printf(" flags 0x%x", isdp->id_flags); 447 if (isdp->id_iobase) { 448 if (isdp->id_iobase < 0x100) { 449 printf(" on motherboard\n"); 450 } else { 451 if (isdp->id_iobase >= 0x1000) { 452 printf (" on eisa\n"); 453 } else { 454 printf (" on isa\n"); 455 } 456 } 457 } 458 /* 459 * Check for conflicts again. The driver may have 460 * changed *dvp. We should weaken the early check 461 * since the driver may have been able to change 462 * *dvp to avoid conflicts if given a chance. We 463 * already skip the early check for IRQs and force 464 * a check for IRQs in the next group of checks. 465 */ 466#ifndef ALLOW_CONFLICT_IRQ 467 checkbits |= CC_IRQ; 468#endif 469 if (haveseen_isadev(isdp, checkbits)) 470 return; 471 isdp->id_alive = id_alive; 472 } 473 (*dp->attach)(isdp); 474 if (isdp->id_irq) { 475 if (mp) 476 INTRMASK(*mp, isdp->id_irq); 477 register_intr(ffs(isdp->id_irq) - 1, isdp->id_id, 478 isdp->id_ri_flags, isdp->id_intr, 479 mp, isdp->id_unit); 480 INTREN(isdp->id_irq); 481 } 482 } else { 483 if (isdp->id_reconfig) { 484 (*dp->attach)(isdp); /* reconfiguration attach */ 485 } 486 if (!last_alive) { 487 if (!isdp->id_reconfig) { 488 printf("%s%d not found", dp->name, isdp->id_unit); 489 if (isdp->id_iobase) { 490 printf(" at 0x%x", isdp->id_iobase); 491 } 492 printf("\n"); 493 } 494 } 495 else { 496 /* This code has not been tested.... */ 497 if (isdp->id_irq) { 498 INTRDIS(isdp->id_irq); 499 unregister_intr(ffs(isdp->id_irq) - 1, 500 isdp->id_intr); 501 if (mp) 502 INTRUNMASK(*mp, isdp->id_irq); 503 } 504 } 505 } 506} 507 508/* 509 * Provide ISA-specific device information to user programs using the 510 * hw.devconf interface. 511 */ 512int 513isa_externalize(struct isa_device *id, void *userp, size_t *maxlen) 514{ 515 if(*maxlen < sizeof *id) { 516 return ENOMEM; 517 } 518 519 *maxlen -= sizeof *id; 520 return copyout(id, userp, sizeof *id); 521} 522 523/* 524 * Do the same thing for EISA information. EISA information is currently 525 * the same as ISA information plus a slot number, but could be extended in 526 * the future. 527 */ 528int 529eisa_externalize(struct isa_device *id, int slot, void *userp, size_t *maxlen) 530{ 531 int rv; 532 533 if(*maxlen < (sizeof *id) + (sizeof slot)) { 534 return ENOMEM; 535 } 536 *maxlen -= (sizeof *id) + (sizeof slot); 537 538 rv = copyout(id, userp, sizeof *id); 539 if(rv) return rv; 540 541 return copyout(&slot, (char *)userp + sizeof *id, sizeof slot); 542} 543 544/* 545 * This is used to forcibly reconfigure an ISA device. It currently just 546 * returns an error 'cos you can't do that yet. It is here to demonstrate 547 * what the `internalize' routine is supposed to do. 548 */ 549int 550isa_internalize(struct isa_device *id, void **userpp, size_t *len) 551{ 552 struct isa_device myid; 553 char *userp = *userpp; 554 int rv; 555 556 if(*len < sizeof *id) { 557 return EINVAL; 558 } 559 560 rv = copyin(userp, &myid, sizeof myid); 561 if(rv) return rv; 562 *userpp = userp + sizeof myid; 563 *len -= sizeof myid; 564 565 rv = EOPNOTSUPP; 566 /* code would go here to validate the configuration request */ 567 /* code would go here to actually perform the reconfiguration */ 568 return rv; 569} 570 571int 572isa_generic_externalize(struct proc *p, struct kern_devconf *kdc, 573 void *userp, size_t l) 574{ 575 return isa_externalize(kdc->kdc_isa, userp, &l); 576} 577 578int 579eisa_generic_externalize(struct proc *p, struct kern_devconf *kdc, 580 void *userp, size_t l) 581{ 582 return eisa_externalize(kdc->kdc_isa, -1, userp, &l); 583} 584 585/* 586 * Fill in default interrupt table (in case of spuruious interrupt 587 * during configuration of kernel, setup interrupt control unit 588 */ 589void 590isa_defaultirq() 591{ 592 int i; 593 594 /* icu vectors */ 595 for (i = 0; i < ICU_LEN; i++) 596 unregister_intr(i, (inthand2_t *)NULL); 597 598 /* initialize 8259's */ 599 outb(IO_ICU1, 0x11); /* reset; program device, four bytes */ 600 outb(IO_ICU1+1, NRSVIDT); /* starting at this vector index */ 601 outb(IO_ICU1+1, 1<<2); /* slave on line 2 */ 602#ifdef AUTO_EOI_1 603 outb(IO_ICU1+1, 2 | 1); /* auto EOI, 8086 mode */ 604#else 605 outb(IO_ICU1+1, 1); /* 8086 mode */ 606#endif 607 outb(IO_ICU1+1, 0xff); /* leave interrupts masked */ 608 outb(IO_ICU1, 0x0a); /* default to IRR on read */ 609 outb(IO_ICU1, 0xc0 | (3 - 1)); /* pri order 3-7, 0-2 (com2 first) */ 610 611 outb(IO_ICU2, 0x11); /* reset; program device, four bytes */ 612 outb(IO_ICU2+1, NRSVIDT+8); /* staring at this vector index */ 613 outb(IO_ICU2+1,2); /* my slave id is 2 */ 614#ifdef AUTO_EOI_2 615 outb(IO_ICU2+1, 2 | 1); /* auto EOI, 8086 mode */ 616#else 617 outb(IO_ICU2+1,1); /* 8086 mode */ 618#endif 619 outb(IO_ICU2+1, 0xff); /* leave interrupts masked */ 620 outb(IO_ICU2, 0x0a); /* default to IRR on read */ 621} 622 623/* region of physical memory known to be contiguous */ 624vm_offset_t isaphysmem; 625static caddr_t dma_bounce[8]; /* XXX */ 626static char bounced[8]; /* XXX */ 627#define MAXDMASZ 512 /* XXX */ 628 629/* high byte of address is stored in this port for i-th dma channel */ 630static short dmapageport[8] = 631 { 0x87, 0x83, 0x81, 0x82, 0x8f, 0x8b, 0x89, 0x8a }; 632 633/* 634 * isa_dmacascade(): program 8237 DMA controller channel to accept 635 * external dma control by a board. 636 */ 637void isa_dmacascade(unsigned chan) 638{ 639 if (chan > 7) 640 panic("isa_dmacascade: impossible request"); 641 642 /* set dma channel mode, and set dma channel mode */ 643 if ((chan & 4) == 0) { 644 outb(DMA1_MODE, DMA37MD_CASCADE | chan); 645 outb(DMA1_SMSK, chan); 646 } else { 647 outb(DMA2_MODE, DMA37MD_CASCADE | (chan & 3)); 648 outb(DMA2_SMSK, chan & 3); 649 } 650} 651 652static int 653isa_dmarangecheck(caddr_t va, unsigned length, unsigned chan); 654 655/* 656 * isa_dmastart(): program 8237 DMA controller channel, avoid page alignment 657 * problems by using a bounce buffer. 658 */ 659void isa_dmastart(int flags, caddr_t addr, unsigned nbytes, unsigned chan) 660{ vm_offset_t phys; 661 int waport; 662 caddr_t newaddr; 663 664 if ( chan > 7 665 || (chan < 4 && nbytes > (1<<16)) 666 || (chan >= 4 && (nbytes > (1<<17) || (u_int)addr & 1))) 667 panic("isa_dmastart: impossible request"); 668 669 if (isa_dmarangecheck(addr, nbytes, chan)) { 670 if (dma_bounce[chan] == 0) 671 dma_bounce[chan] = 672 /*(caddr_t)malloc(MAXDMASZ, M_TEMP, M_WAITOK);*/ 673 (caddr_t) isaphysmem + NBPG*chan; 674 bounced[chan] = 1; 675 newaddr = dma_bounce[chan]; 676 *(int *) newaddr = 0; /* XXX */ 677 678 /* copy bounce buffer on write */ 679 if (!(flags & B_READ)) 680 bcopy(addr, newaddr, nbytes); 681 addr = newaddr; 682 } 683 684 /* translate to physical */ 685 phys = pmap_extract(pmap_kernel(), (vm_offset_t)addr); 686 687 if ((chan & 4) == 0) { 688 /* 689 * Program one of DMA channels 0..3. These are 690 * byte mode channels. 691 */ 692 /* set dma channel mode, and reset address ff */ 693 if (flags & B_READ) 694 outb(DMA1_MODE, DMA37MD_SINGLE|DMA37MD_WRITE|chan); 695 else 696 outb(DMA1_MODE, DMA37MD_SINGLE|DMA37MD_READ|chan); 697 outb(DMA1_FFC, 0); 698 699 /* send start address */ 700 waport = DMA1_CHN(chan); 701 outb(waport, phys); 702 outb(waport, phys>>8); 703 outb(dmapageport[chan], phys>>16); 704 705 /* send count */ 706 outb(waport + 1, --nbytes); 707 outb(waport + 1, nbytes>>8); 708 709 /* unmask channel */ 710 outb(DMA1_SMSK, chan); 711 } else { 712 /* 713 * Program one of DMA channels 4..7. These are 714 * word mode channels. 715 */ 716 /* set dma channel mode, and reset address ff */ 717 if (flags & B_READ) 718 outb(DMA2_MODE, DMA37MD_SINGLE|DMA37MD_WRITE|(chan&3)); 719 else 720 outb(DMA2_MODE, DMA37MD_SINGLE|DMA37MD_READ|(chan&3)); 721 outb(DMA2_FFC, 0); 722 723 /* send start address */ 724 waport = DMA2_CHN(chan - 4); 725 outb(waport, phys>>1); 726 outb(waport, phys>>9); 727 outb(dmapageport[chan], phys>>16); 728 729 /* send count */ 730 nbytes >>= 1; 731 outb(waport + 2, --nbytes); 732 outb(waport + 2, nbytes>>8); 733 734 /* unmask channel */ 735 outb(DMA2_SMSK, chan & 3); 736 } 737} 738 739void isa_dmadone(int flags, caddr_t addr, int nbytes, int chan) 740{ 741 742 /* copy bounce buffer on read */ 743 /*if ((flags & (B_PHYS|B_READ)) == (B_PHYS|B_READ))*/ 744 if (bounced[chan]) { 745 bcopy(dma_bounce[chan], addr, nbytes); 746 bounced[chan] = 0; 747 } 748} 749 750/* 751 * Check for problems with the address range of a DMA transfer 752 * (non-contiguous physical pages, outside of bus address space, 753 * crossing DMA page boundaries). 754 * Return true if special handling needed. 755 */ 756 757static int 758isa_dmarangecheck(caddr_t va, unsigned length, unsigned chan) { 759 vm_offset_t phys, priorpage = 0, endva; 760 u_int dma_pgmsk = (chan & 4) ? ~(128*1024-1) : ~(64*1024-1); 761 762 endva = (vm_offset_t)round_page(va + length); 763 for (; va < (caddr_t) endva ; va += NBPG) { 764 phys = trunc_page(pmap_extract(pmap_kernel(), (vm_offset_t)va)); 765#define ISARAM_END RAM_END 766 if (phys == 0) 767 panic("isa_dmacheck: no physical page present"); 768 if (phys >= ISARAM_END) 769 return (1); 770 if (priorpage) { 771 if (priorpage + NBPG != phys) 772 return (1); 773 /* check if crossing a DMA page boundary */ 774 if (((u_int)priorpage ^ (u_int)phys) & dma_pgmsk) 775 return (1); 776 } 777 priorpage = phys; 778 } 779 return (0); 780} 781 782/* head of queue waiting for physmem to become available */ 783struct buf isa_physmemq; 784 785/* blocked waiting for resource to become free for exclusive use */ 786static isaphysmemflag; 787/* if waited for and call requested when free (B_CALL) */ 788static void (*isaphysmemunblock)(); /* needs to be a list */ 789 790/* 791 * Allocate contiguous physical memory for transfer, returning 792 * a *virtual* address to region. May block waiting for resource. 793 * (assumed to be called at splbio()) 794 */ 795caddr_t 796isa_allocphysmem(caddr_t va, unsigned length, void (*func)()) { 797 798 isaphysmemunblock = func; 799 while (isaphysmemflag & B_BUSY) { 800 isaphysmemflag |= B_WANTED; 801 tsleep((caddr_t)&isaphysmemflag, PRIBIO, "isaphys", 0); 802 } 803 isaphysmemflag |= B_BUSY; 804 805 return((caddr_t)isaphysmem); 806} 807 808/* 809 * Free contiguous physical memory used for transfer. 810 * (assumed to be called at splbio()) 811 */ 812void 813isa_freephysmem(caddr_t va, unsigned length) { 814 815 isaphysmemflag &= ~B_BUSY; 816 if (isaphysmemflag & B_WANTED) { 817 isaphysmemflag &= B_WANTED; 818 wakeup((caddr_t)&isaphysmemflag); 819 if (isaphysmemunblock) 820 (*isaphysmemunblock)(); 821 } 822} 823 824#define NMI_PARITY (1 << 7) 825#define NMI_IOCHAN (1 << 6) 826#define ENMI_WATCHDOG (1 << 7) 827#define ENMI_BUSTIMER (1 << 6) 828#define ENMI_IOSTATUS (1 << 5) 829 830/* 831 * Handle a NMI, possibly a machine check. 832 * return true to panic system, false to ignore. 833 */ 834int 835isa_nmi(cd) 836 int cd; 837{ 838 int isa_port = inb(0x61); 839 int eisa_port = inb(0x461); 840 if(isa_port & NMI_PARITY) { 841 panic("RAM parity error, likely hardware failure."); 842 } else if(isa_port & NMI_IOCHAN) { 843 panic("I/O channel check, likely hardware failure."); 844 } else if(eisa_port & ENMI_WATCHDOG) { 845 panic("EISA watchdog timer expired, likely hardware failure."); 846 } else if(eisa_port & ENMI_BUSTIMER) { 847 panic("EISA bus timeout, likely hardware failure."); 848 } else if(eisa_port & ENMI_IOSTATUS) { 849 panic("EISA I/O port status error."); 850 } else { 851 printf("\nNMI ISA %x, EISA %x\n", isa_port, eisa_port); 852 return(0); 853 } 854} 855 856/* 857 * Caught a stray interrupt, notify 858 */ 859static void 860isa_strayintr(d) 861 int d; 862{ 863 864 /* DON'T BOTHER FOR NOW! */ 865 /* for some reason, we get bursts of intr #7, even if not enabled! */ 866 /* 867 * Well the reason you got bursts of intr #7 is because someone 868 * raised an interrupt line and dropped it before the 8259 could 869 * prioritize it. This is documented in the intel data book. This 870 * means you have BAD hardware! I have changed this so that only 871 * the first 5 get logged, then it quits logging them, and puts 872 * out a special message. rgrimes 3/25/1993 873 */ 874 /* 875 * XXX TODO print a different message for #7 if it is for a 876 * glitch. Glitches can be distinguished from real #7's by 877 * testing that the in-service bit is _not_ set. The test 878 * must be done before sending an EOI so it can't be done if 879 * we are using AUTO_EOI_1. 880 */ 881 if (intrcnt[NR_DEVICES + d] <= 5) 882 log(LOG_ERR, "stray irq %d\n", d); 883 if (intrcnt[NR_DEVICES + d] == 5) 884 log(LOG_CRIT, 885 "too many stray irq %d's; not logging any more\n", d); 886} 887 888/* 889 * find an ISA device in a given isa_devtab_* table, given 890 * the table to search, the expected id_driver entry, and the unit number. 891 * 892 * this function is defined in isa_device.h, and this location is debatable; 893 * i put it there because it's useless w/o, and directly operates on 894 * the other stuff in that file. 895 * 896 */ 897 898struct isa_device *find_isadev(table, driverp, unit) 899 struct isa_device *table; 900 struct isa_driver *driverp; 901 int unit; 902{ 903 if (driverp == NULL) /* sanity check */ 904 return NULL; 905 906 while ((table->id_driver != driverp) || (table->id_unit != unit)) { 907 if (table->id_driver == 0) 908 return NULL; 909 910 table++; 911 } 912 913 return table; 914} 915 916/* 917 * Return nonzero if a (masked) irq is pending for a given device. 918 */ 919int 920isa_irq_pending(dvp) 921 struct isa_device *dvp; 922{ 923 unsigned id_irq; 924 925 id_irq = dvp->id_irq; 926 if (id_irq & 0xff) 927 return (inb(IO_ICU1) & id_irq); 928 return (inb(IO_ICU2) & (id_irq >> 8)); 929} 930 931int 932register_intr(intr, device_id, flags, handler, maskptr, unit) 933 int intr; 934 int device_id; 935 u_int flags; 936 inthand2_t *handler; 937 u_int *maskptr; 938 int unit; 939{ 940 char *cp; 941 u_long ef; 942 int id; 943 u_int mask = (maskptr ? *maskptr : 0); 944 945 if ((u_int)intr >= ICU_LEN || intr == 2 946 || (u_int)device_id >= NR_DEVICES) 947 return (EINVAL); 948 if (intr_handler[intr] != isa_strayintr) 949 return (EBUSY); 950 ef = read_eflags(); 951 disable_intr(); 952 intr_countp[intr] = &intrcnt[device_id]; 953 intr_handler[intr] = handler; 954 intr_mask[intr] = mask | (1 << intr); 955 intr_unit[intr] = unit; 956 setidt(ICU_OFFSET + intr, 957 flags & RI_FAST ? fastintr[intr] : slowintr[intr], 958 SDT_SYS386IGT, SEL_KPL); 959 write_eflags(ef); 960 for (cp = intrnames, id = 0; id <= device_id; id++) 961 while (*cp++ != '\0') 962 ; 963 if (cp > eintrnames) 964 return (0); 965 if (intr < 10) { 966 cp[-3] = intr + '0'; 967 cp[-2] = ' '; 968 } else { 969 cp[-3] = '1'; 970 cp[-2] = intr - 10 + '0'; 971 } 972 return (0); 973} 974 975static void 976register_imask(dvp, mask) 977 struct isa_device *dvp; 978 u_int mask; 979{ 980 if (dvp->id_alive && dvp->id_irq) { 981 int intr; 982 983 intr = ffs(dvp->id_irq) - 1; 984 intr_mask[intr] = mask | (1 <<intr); 985 } 986} 987 988int 989unregister_intr(intr, handler) 990 int intr; 991 inthand2_t *handler; 992{ 993 u_long ef; 994 995 if ((u_int)intr >= ICU_LEN || handler != intr_handler[intr]) 996 return (EINVAL); 997 ef = read_eflags(); 998 disable_intr(); 999 intr_countp[intr] = &intrcnt[NR_DEVICES + intr]; 1000 intr_handler[intr] = isa_strayintr; 1001 intr_mask[intr] = HWI_MASK | SWI_MASK; 1002 intr_unit[intr] = intr; 1003 setidt(ICU_OFFSET + intr, slowintr[intr], SDT_SYS386IGT, SEL_KPL); 1004 write_eflags(ef); 1005 return (0); 1006} 1007