isa.c revision 3713
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 1.28 1994/10/17 21:16:38 phk 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 109static inthand_t *fastintr[ICU_LEN] = { 110 &IDTVEC(fastintr0), &IDTVEC(fastintr1), 111 &IDTVEC(fastintr2), &IDTVEC(fastintr3), 112 &IDTVEC(fastintr4), &IDTVEC(fastintr5), 113 &IDTVEC(fastintr6), &IDTVEC(fastintr7), 114 &IDTVEC(fastintr8), &IDTVEC(fastintr9), 115 &IDTVEC(fastintr10), &IDTVEC(fastintr11), 116 &IDTVEC(fastintr12), &IDTVEC(fastintr13), 117 &IDTVEC(fastintr14), &IDTVEC(fastintr15) 118}; 119 120static inthand_t *slowintr[ICU_LEN] = { 121 &IDTVEC(intr0), &IDTVEC(intr1), &IDTVEC(intr2), &IDTVEC(intr3), 122 &IDTVEC(intr4), &IDTVEC(intr5), &IDTVEC(intr6), &IDTVEC(intr7), 123 &IDTVEC(intr8), &IDTVEC(intr9), &IDTVEC(intr10), &IDTVEC(intr11), 124 &IDTVEC(intr12), &IDTVEC(intr13), &IDTVEC(intr14), &IDTVEC(intr15) 125}; 126 127static void config_isadev __P((struct isa_device *isdp, u_int *mp)); 128static void conflict __P((struct isa_device *dvp, struct isa_device *tmpdvp, 129 int item, char const *whatnot, char const *reason, 130 char const *format)); 131static int haveseen __P((struct isa_device *dvp, struct isa_device *tmpdvp, 132 u_int checkbits)); 133static int haveseen_isadev __P((struct isa_device *dvp, u_int checkbits)); 134static inthand2_t isa_strayintr; 135static void register_imask __P((struct isa_device *dvp, u_int mask)); 136 137/* 138 * print a conflict message 139 */ 140static void 141conflict(dvp, tmpdvp, item, whatnot, reason, format) 142 struct isa_device *dvp; 143 struct isa_device *tmpdvp; 144 int item; 145 char const *whatnot; 146 char const *reason; 147 char const *format; 148{ 149 printf("%s%d not %sed due to %s conflict with %s%d at ", 150 dvp->id_driver->name, dvp->id_unit, whatnot, reason, 151 tmpdvp->id_driver->name, tmpdvp->id_unit); 152 printf(format, item); 153 printf("\n"); 154} 155 156/* 157 * Check to see if things are alread in use, like IRQ's, I/O addresses 158 * and Memory addresses. 159 */ 160static int 161haveseen(dvp, tmpdvp, checkbits) 162 struct isa_device *dvp; 163 struct isa_device *tmpdvp; 164 u_int checkbits; 165{ 166 /* 167 * Only check against devices that have already been found 168 */ 169 if (tmpdvp->id_alive) { 170 char const *whatnot; 171 172 whatnot = checkbits & CC_ATTACH ? "attach" : "prob"; 173 /* 174 * Check for I/O address conflict. We can only check the 175 * starting address of the device against the range of the 176 * device that has already been probed since we do not 177 * know how many I/O addresses this device uses. 178 */ 179 if (checkbits & CC_IOADDR && tmpdvp->id_alive != -1) { 180 if ((dvp->id_iobase >= tmpdvp->id_iobase) && 181 (dvp->id_iobase <= 182 (tmpdvp->id_iobase + tmpdvp->id_alive - 1))) { 183 conflict(dvp, tmpdvp, dvp->id_iobase, whatnot, 184 "I/O address", "0x%x"); 185 return 1; 186 } 187 } 188 /* 189 * Check for Memory address conflict. We can check for 190 * range overlap, but it will not catch all cases since the 191 * driver may adjust the msize paramater during probe, for 192 * now we just check that the starting address does not 193 * fall within any allocated region. 194 * XXX could add a second check after the probe for overlap, 195 * since at that time we would know the full range. 196 * XXX KERNBASE is a hack, we should have vaddr in the table! 197 */ 198 if (checkbits & CC_MEMADDR && tmpdvp->id_maddr) { 199 if ((KERNBASE + dvp->id_maddr >= tmpdvp->id_maddr) && 200 (KERNBASE + dvp->id_maddr <= 201 (tmpdvp->id_maddr + tmpdvp->id_msize - 1))) { 202 conflict(dvp, tmpdvp, (int)dvp->id_maddr, 203 whatnot, "maddr", "0x%x"); 204 return 1; 205 } 206 } 207 /* 208 * Check for IRQ conflicts. 209 */ 210 if (checkbits & CC_IRQ && tmpdvp->id_irq) { 211 if (tmpdvp->id_irq == dvp->id_irq) { 212 conflict(dvp, tmpdvp, ffs(dvp->id_irq) - 1, 213 whatnot, "irq", "%d"); 214 return 1; 215 } 216 } 217 /* 218 * Check for DRQ conflicts. 219 */ 220 if (checkbits & CC_DRQ && tmpdvp->id_drq != -1) { 221 if (tmpdvp->id_drq == dvp->id_drq) { 222 conflict(dvp, tmpdvp, dvp->id_drq, whatnot, 223 "drq", "%d"); 224 return 1; 225 } 226 } 227 } 228 return 0; 229} 230 231/* 232 * Search through all the isa_devtab_* tables looking for anything that 233 * conflicts with the current device. 234 */ 235static int 236haveseen_isadev(dvp, checkbits) 237 struct isa_device *dvp; 238 u_int checkbits; 239{ 240 struct isa_device *tmpdvp; 241 int status = 0; 242 243 for (tmpdvp = isa_devtab_tty; tmpdvp->id_driver; tmpdvp++) { 244 status |= haveseen(dvp, tmpdvp, checkbits); 245 if (status) 246 return status; 247 } 248 for (tmpdvp = isa_devtab_bio; tmpdvp->id_driver; tmpdvp++) { 249 status |= haveseen(dvp, tmpdvp, checkbits); 250 if (status) 251 return status; 252 } 253 for (tmpdvp = isa_devtab_net; tmpdvp->id_driver; tmpdvp++) { 254 status |= haveseen(dvp, tmpdvp, checkbits); 255 if (status) 256 return status; 257 } 258 for (tmpdvp = isa_devtab_null; tmpdvp->id_driver; tmpdvp++) { 259 status |= haveseen(dvp, tmpdvp, checkbits); 260 if (status) 261 return status; 262 } 263 return(status); 264} 265 266/* 267 * Configure all ISA devices 268 */ 269void 270isa_configure() { 271 struct isa_device *dvp; 272 273 splhigh(); 274 enable_intr(); 275 INTREN(IRQ_SLAVE); 276 printf("Probing for devices on the ISA bus:\n"); 277 /* First probe all the sensitive probes */ 278 for (dvp = isa_devtab_tty; dvp->id_driver; dvp++) 279 if (dvp->id_driver->sensitive_hw) 280 config_isadev(dvp, &tty_imask); 281 for (dvp = isa_devtab_bio; dvp->id_driver; dvp++) 282 if (dvp->id_driver->sensitive_hw) 283 config_isadev(dvp, &bio_imask); 284 for (dvp = isa_devtab_net; dvp->id_driver; dvp++) 285 if (dvp->id_driver->sensitive_hw) 286 config_isadev(dvp, &net_imask); 287 for (dvp = isa_devtab_null; dvp->id_driver; dvp++) 288 if (dvp->id_driver->sensitive_hw) 289 config_isadev(dvp, (u_int *)NULL); 290 291 /* Then all the bad ones */ 292 for (dvp = isa_devtab_tty; dvp->id_driver; dvp++) 293 if (!dvp->id_driver->sensitive_hw) 294 config_isadev(dvp, &tty_imask); 295 for (dvp = isa_devtab_bio; dvp->id_driver; dvp++) 296 if (!dvp->id_driver->sensitive_hw) 297 config_isadev(dvp, &bio_imask); 298 for (dvp = isa_devtab_net; dvp->id_driver; dvp++) 299 if (!dvp->id_driver->sensitive_hw) 300 config_isadev(dvp, &net_imask); 301 for (dvp = isa_devtab_null; dvp->id_driver; dvp++) 302 if (!dvp->id_driver->sensitive_hw) 303 config_isadev(dvp, (u_int *)NULL); 304 305 bio_imask |= SWI_CLOCK_MASK; 306 net_imask |= SWI_NET_MASK; 307 tty_imask |= SWI_TTY_MASK; 308 309/* 310 * XXX we should really add the tty device to net_imask when the line is 311 * switched to SLIPDISC, and then remove it when it is switched away from 312 * SLIPDISC. No need to block out ALL ttys during a splimp when only one 313 * of them is running slip. 314 * 315 * XXX actually, blocking all ttys during a splimp doesn't matter so much 316 * with sio because the serial interrupt layer doesn't use tty_imask. Only 317 * non-serial ttys suffer. It's more stupid that ALL 'net's are blocked 318 * during spltty. 319 */ 320#include "sl.h" 321#include "ppp.h" 322 323#if (NSL > 0) || (NPPP > 0) 324 net_imask |= tty_imask; 325 tty_imask = net_imask; 326#endif 327 /* bio_imask |= tty_imask ; can some tty devices use buffers? */ 328#ifdef DIAGNOSTIC 329 printf("bio_imask %x tty_imask %x net_imask %x\n", 330 bio_imask, tty_imask, net_imask); 331#endif 332 /* 333 * Finish initializing intr_mask[]. Note that the partly 334 * constructed masks aren't actually used since we're at splhigh. 335 * For fully dynamic initialization, register_intr() and 336 * unregister_intr() will have to adjust the masks for _all_ 337 * interrupts and for tty_imask, etc. 338 */ 339 for (dvp = isa_devtab_tty; dvp->id_driver; dvp++) 340 register_imask(dvp, tty_imask); 341 for (dvp = isa_devtab_bio; dvp->id_driver; dvp++) 342 register_imask(dvp, bio_imask); 343 for (dvp = isa_devtab_net; dvp->id_driver; dvp++) 344 register_imask(dvp, net_imask); 345 for (dvp = isa_devtab_null; dvp->id_driver; dvp++) 346 register_imask(dvp, SWI_CLOCK_MASK); 347 spl0(); 348} 349 350/* 351 * Configure an ISA device. 352 */ 353 354 355static void config_isadev_c(); 356 357static void 358config_isadev(isdp, mp) 359 struct isa_device *isdp; 360 u_int *mp; 361{ 362 config_isadev_c(isdp, mp, 0); 363} 364 365void 366reconfig_isadev(isdp, mp) 367 struct isa_device *isdp; 368 u_int *mp; 369{ 370 config_isadev_c(isdp, mp, 1); 371} 372 373static void 374config_isadev_c(isdp, mp, reconfig) 375 struct isa_device *isdp; 376 u_int *mp; 377 int reconfig; 378{ 379 u_int checkbits; 380 int id_alive; 381 int last_alive; 382 struct isa_driver *dp = isdp->id_driver; 383 384 checkbits = 0; 385#ifndef ALLOW_CONFLICT_IRQ 386 checkbits |= CC_IRQ; 387#endif 388#ifndef ALLOW_CONFLICT_DRQ 389 checkbits |= CC_DRQ; 390#endif 391#ifndef ALLOW_CONFLICT_IOADDR 392 checkbits |= CC_IOADDR; 393#endif 394#ifndef ALLOW_CONFLICT_MEMADDR 395 checkbits |= CC_MEMADDR; 396#endif 397 if (!reconfig && haveseen_isadev(isdp, checkbits)) 398 return; 399 if (!reconfig && isdp->id_maddr) { 400 isdp->id_maddr -= 0xa0000; /* XXX should be a define */ 401 isdp->id_maddr += atdevbase; 402 } 403 if (reconfig) { 404 last_alive = isdp->id_alive; 405 } 406 else { 407 last_alive = 0; 408 } 409 id_alive = (*dp->probe)(isdp); 410 if (id_alive) { 411 /* 412 * Only print the I/O address range if id_alive != -1 413 * Right now this is a temporary fix just for the new 414 * NPX code so that if it finds a 486 that can use trap 415 * 16 it will not report I/O addresses. 416 * Rod Grimes 04/26/94 417 */ 418 if (!isdp->id_reconfig) { 419 printf("%s%d", dp->name, isdp->id_unit); 420 if (id_alive != -1) { 421 printf(" at 0x%x", isdp->id_iobase); 422 if ((isdp->id_iobase + id_alive - 1) != 423 isdp->id_iobase) { 424 printf("-0x%x", 425 isdp->id_iobase + id_alive - 1); 426 } 427 } 428 if (isdp->id_irq) 429 printf(" irq %d", ffs(isdp->id_irq) - 1); 430 if (isdp->id_drq != -1) 431 printf(" drq %d", isdp->id_drq); 432 if (isdp->id_maddr) 433 printf(" maddr 0x%lx", kvtop(isdp->id_maddr)); 434 if (isdp->id_msize) 435 printf(" msize %d", isdp->id_msize); 436 if (isdp->id_flags) 437 printf(" flags 0x%x", isdp->id_flags); 438 if (isdp->id_iobase) { 439 if (isdp->id_iobase < 0x100) { 440 printf(" on motherboard\n"); 441 } else { 442 if (isdp->id_iobase >= 0x1000) { 443 printf (" on eisa\n"); 444 } else { 445 printf (" on isa\n"); 446 } 447 } 448 } 449 /* 450 * Check for conflicts again. The driver may have 451 * changed *dvp. We should weaken the early check 452 * since the driver may have been able to change 453 * *dvp to avoid conflicts if given a chance. We 454 * already skip the early check for IRQs and force 455 * a check for IRQs in the next group of checks. 456 */ 457#ifndef ALLOW_CONFLICT_IRQ 458 checkbits |= CC_IRQ; 459#endif 460 if (haveseen_isadev(isdp, checkbits)) 461 return; 462 isdp->id_alive = id_alive; 463 } 464 (*dp->attach)(isdp); 465 if (isdp->id_irq) { 466 if (mp) 467 INTRMASK(*mp, isdp->id_irq); 468 register_intr(ffs(isdp->id_irq) - 1, isdp->id_id, 469 isdp->id_ri_flags, isdp->id_intr, 470 mp ? *mp : 0, isdp->id_unit); 471 INTREN(isdp->id_irq); 472 } 473 } else { 474 if (isdp->id_reconfig) { 475 (*dp->attach)(isdp); /* reconfiguration attach */ 476 } 477 if (!last_alive) { 478 if (!isdp->id_reconfig) { 479 printf("%s%d not found", dp->name, isdp->id_unit); 480 if (isdp->id_iobase) { 481 printf(" at 0x%x", isdp->id_iobase); 482 } 483 printf("\n"); 484 } 485 } 486 else { 487 /* This code has not been tested.... */ 488 if (isdp->id_irq) { 489 INTRDIS(isdp->id_irq); 490 unregister_intr(ffs(isdp->id_irq) - 1, 491 isdp->id_intr); 492 if (mp) 493 INTRUNMASK(*mp, isdp->id_irq); 494 } 495 } 496 } 497} 498 499/* 500 * Provide ISA-specific device information to user programs using the 501 * hw.devconf interface. 502 */ 503int 504isa_externalize(struct isa_device *id, void *userp, size_t *maxlen) 505{ 506 if(*maxlen < sizeof *id) { 507 return ENOMEM; 508 } 509 510 *maxlen -= sizeof *id; 511 return copyout(id, userp, sizeof *id); 512} 513 514/* 515 * Do the same thing for EISA information. EISA information is currently 516 * the same as ISA information plus a slot number, but could be extended in 517 * the future. 518 */ 519int 520eisa_externalize(struct isa_device *id, int slot, void *userp, size_t *maxlen) 521{ 522 int rv; 523 524 if(*maxlen < (sizeof *id) + (sizeof slot)) { 525 return ENOMEM; 526 } 527 *maxlen -= (sizeof *id) + (sizeof slot); 528 529 rv = copyout(id, userp, sizeof *id); 530 if(rv) return rv; 531 532 return copyout(&slot, (char *)userp + sizeof *id, sizeof slot); 533} 534 535/* 536 * This is used to forcibly reconfigure an ISA device. It currently just 537 * returns an error 'cos you can't do that yet. It is here to demonstrate 538 * what the `internalize' routine is supposed to do. 539 */ 540int 541isa_internalize(struct isa_device *id, void **userpp, size_t *len) 542{ 543 struct isa_device myid; 544 char *userp = *userpp; 545 int rv; 546 547 if(*len < sizeof *id) { 548 return EINVAL; 549 } 550 551 rv = copyin(userp, &myid, sizeof myid); 552 if(rv) return rv; 553 *userpp = userp + sizeof myid; 554 *len -= sizeof myid; 555 556 rv = EOPNOTSUPP; 557 /* code would go here to validate the configuration request */ 558 /* code would go here to actually perform the reconfiguration */ 559 return rv; 560} 561 562int 563isa_generic_externalize(struct proc *p, struct kern_devconf *kdc, 564 void *userp, size_t l) 565{ 566 return isa_externalize(kdc->kdc_isa, userp, &l); 567} 568 569int 570eisa_generic_externalize(struct proc *p, struct kern_devconf *kdc, 571 void *userp, size_t l) 572{ 573 return eisa_externalize(kdc->kdc_isa, -1, userp, &l); 574} 575 576/* 577 * Fill in default interrupt table (in case of spuruious interrupt 578 * during configuration of kernel, setup interrupt control unit 579 */ 580void 581isa_defaultirq() 582{ 583 int i; 584 585 /* icu vectors */ 586 for (i = 0; i < ICU_LEN; i++) 587 unregister_intr(i, (inthand2_t *)NULL); 588 589 /* initialize 8259's */ 590 outb(IO_ICU1, 0x11); /* reset; program device, four bytes */ 591 outb(IO_ICU1+1, NRSVIDT); /* starting at this vector index */ 592 outb(IO_ICU1+1, 1<<2); /* slave on line 2 */ 593#ifdef AUTO_EOI_1 594 outb(IO_ICU1+1, 2 | 1); /* auto EOI, 8086 mode */ 595#else 596 outb(IO_ICU1+1, 1); /* 8086 mode */ 597#endif 598 outb(IO_ICU1+1, 0xff); /* leave interrupts masked */ 599 outb(IO_ICU1, 0x0a); /* default to IRR on read */ 600 outb(IO_ICU1, 0xc0 | (3 - 1)); /* pri order 3-7, 0-2 (com2 first) */ 601 602 outb(IO_ICU2, 0x11); /* reset; program device, four bytes */ 603 outb(IO_ICU2+1, NRSVIDT+8); /* staring at this vector index */ 604 outb(IO_ICU2+1,2); /* my slave id is 2 */ 605#ifdef AUTO_EOI_2 606 outb(IO_ICU2+1, 2 | 1); /* auto EOI, 8086 mode */ 607#else 608 outb(IO_ICU2+1,1); /* 8086 mode */ 609#endif 610 outb(IO_ICU2+1, 0xff); /* leave interrupts masked */ 611 outb(IO_ICU2, 0x0a); /* default to IRR on read */ 612} 613 614/* region of physical memory known to be contiguous */ 615vm_offset_t isaphysmem; 616static caddr_t dma_bounce[8]; /* XXX */ 617static char bounced[8]; /* XXX */ 618#define MAXDMASZ 512 /* XXX */ 619 620/* high byte of address is stored in this port for i-th dma channel */ 621static short dmapageport[8] = 622 { 0x87, 0x83, 0x81, 0x82, 0x8f, 0x8b, 0x89, 0x8a }; 623 624/* 625 * isa_dmacascade(): program 8237 DMA controller channel to accept 626 * external dma control by a board. 627 */ 628void isa_dmacascade(unsigned chan) 629{ 630 if (chan > 7) 631 panic("isa_dmacascade: impossible request"); 632 633 /* set dma channel mode, and set dma channel mode */ 634 if ((chan & 4) == 0) { 635 outb(DMA1_MODE, DMA37MD_CASCADE | chan); 636 outb(DMA1_SMSK, chan); 637 } else { 638 outb(DMA2_MODE, DMA37MD_CASCADE | (chan & 3)); 639 outb(DMA2_SMSK, chan & 3); 640 } 641} 642 643static int 644isa_dmarangecheck(caddr_t va, unsigned length, unsigned chan); 645 646/* 647 * isa_dmastart(): program 8237 DMA controller channel, avoid page alignment 648 * problems by using a bounce buffer. 649 */ 650void isa_dmastart(int flags, caddr_t addr, unsigned nbytes, unsigned chan) 651{ vm_offset_t phys; 652 int waport; 653 caddr_t newaddr; 654 655 if ( chan > 7 656 || (chan < 4 && nbytes > (1<<16)) 657 || (chan >= 4 && (nbytes > (1<<17) || (u_int)addr & 1))) 658 panic("isa_dmastart: impossible request"); 659 660 if (isa_dmarangecheck(addr, nbytes, chan)) { 661 if (dma_bounce[chan] == 0) 662 dma_bounce[chan] = 663 /*(caddr_t)malloc(MAXDMASZ, M_TEMP, M_WAITOK);*/ 664 (caddr_t) isaphysmem + NBPG*chan; 665 bounced[chan] = 1; 666 newaddr = dma_bounce[chan]; 667 *(int *) newaddr = 0; /* XXX */ 668 669 /* copy bounce buffer on write */ 670 if (!(flags & B_READ)) 671 bcopy(addr, newaddr, nbytes); 672 addr = newaddr; 673 } 674 675 /* translate to physical */ 676 phys = pmap_extract(pmap_kernel(), (vm_offset_t)addr); 677 678 if ((chan & 4) == 0) { 679 /* 680 * Program one of DMA channels 0..3. These are 681 * byte mode channels. 682 */ 683 /* set dma channel mode, and reset address ff */ 684 if (flags & B_READ) 685 outb(DMA1_MODE, DMA37MD_SINGLE|DMA37MD_WRITE|chan); 686 else 687 outb(DMA1_MODE, DMA37MD_SINGLE|DMA37MD_READ|chan); 688 outb(DMA1_FFC, 0); 689 690 /* send start address */ 691 waport = DMA1_CHN(chan); 692 outb(waport, phys); 693 outb(waport, phys>>8); 694 outb(dmapageport[chan], phys>>16); 695 696 /* send count */ 697 outb(waport + 1, --nbytes); 698 outb(waport + 1, nbytes>>8); 699 700 /* unmask channel */ 701 outb(DMA1_SMSK, chan); 702 } else { 703 /* 704 * Program one of DMA channels 4..7. These are 705 * word mode channels. 706 */ 707 /* set dma channel mode, and reset address ff */ 708 if (flags & B_READ) 709 outb(DMA2_MODE, DMA37MD_SINGLE|DMA37MD_WRITE|(chan&3)); 710 else 711 outb(DMA2_MODE, DMA37MD_SINGLE|DMA37MD_READ|(chan&3)); 712 outb(DMA2_FFC, 0); 713 714 /* send start address */ 715 waport = DMA2_CHN(chan - 4); 716 outb(waport, phys>>1); 717 outb(waport, phys>>9); 718 outb(dmapageport[chan], phys>>16); 719 720 /* send count */ 721 nbytes >>= 1; 722 outb(waport + 2, --nbytes); 723 outb(waport + 2, nbytes>>8); 724 725 /* unmask channel */ 726 outb(DMA2_SMSK, chan & 3); 727 } 728} 729 730void isa_dmadone(int flags, caddr_t addr, int nbytes, int chan) 731{ 732 733 /* copy bounce buffer on read */ 734 /*if ((flags & (B_PHYS|B_READ)) == (B_PHYS|B_READ))*/ 735 if (bounced[chan]) { 736 bcopy(dma_bounce[chan], addr, nbytes); 737 bounced[chan] = 0; 738 } 739} 740 741/* 742 * Check for problems with the address range of a DMA transfer 743 * (non-contiguous physical pages, outside of bus address space, 744 * crossing DMA page boundaries). 745 * Return true if special handling needed. 746 */ 747 748static int 749isa_dmarangecheck(caddr_t va, unsigned length, unsigned chan) { 750 vm_offset_t phys, priorpage = 0, endva; 751 u_int dma_pgmsk = (chan & 4) ? ~(128*1024-1) : ~(64*1024-1); 752 753 endva = (vm_offset_t)round_page(va + length); 754 for (; va < (caddr_t) endva ; va += NBPG) { 755 phys = trunc_page(pmap_extract(pmap_kernel(), (vm_offset_t)va)); 756#define ISARAM_END RAM_END 757 if (phys == 0) 758 panic("isa_dmacheck: no physical page present"); 759 if (phys >= ISARAM_END) 760 return (1); 761 if (priorpage) { 762 if (priorpage + NBPG != phys) 763 return (1); 764 /* check if crossing a DMA page boundary */ 765 if (((u_int)priorpage ^ (u_int)phys) & dma_pgmsk) 766 return (1); 767 } 768 priorpage = phys; 769 } 770 return (0); 771} 772 773/* head of queue waiting for physmem to become available */ 774struct buf isa_physmemq; 775 776/* blocked waiting for resource to become free for exclusive use */ 777static isaphysmemflag; 778/* if waited for and call requested when free (B_CALL) */ 779static void (*isaphysmemunblock)(); /* needs to be a list */ 780 781/* 782 * Allocate contiguous physical memory for transfer, returning 783 * a *virtual* address to region. May block waiting for resource. 784 * (assumed to be called at splbio()) 785 */ 786caddr_t 787isa_allocphysmem(caddr_t va, unsigned length, void (*func)()) { 788 789 isaphysmemunblock = func; 790 while (isaphysmemflag & B_BUSY) { 791 isaphysmemflag |= B_WANTED; 792 tsleep((caddr_t)&isaphysmemflag, PRIBIO, "isaphys", 0); 793 } 794 isaphysmemflag |= B_BUSY; 795 796 return((caddr_t)isaphysmem); 797} 798 799/* 800 * Free contiguous physical memory used for transfer. 801 * (assumed to be called at splbio()) 802 */ 803void 804isa_freephysmem(caddr_t va, unsigned length) { 805 806 isaphysmemflag &= ~B_BUSY; 807 if (isaphysmemflag & B_WANTED) { 808 isaphysmemflag &= B_WANTED; 809 wakeup((caddr_t)&isaphysmemflag); 810 if (isaphysmemunblock) 811 (*isaphysmemunblock)(); 812 } 813} 814 815#define NMI_PARITY (1 << 7) 816#define NMI_IOCHAN (1 << 6) 817#define ENMI_WATCHDOG (1 << 7) 818#define ENMI_BUSTIMER (1 << 6) 819#define ENMI_IOSTATUS (1 << 5) 820 821/* 822 * Handle a NMI, possibly a machine check. 823 * return true to panic system, false to ignore. 824 */ 825int 826isa_nmi(cd) 827 int cd; 828{ 829 int isa_port = inb(0x61); 830 int eisa_port = inb(0x461); 831 if(isa_port & NMI_PARITY) { 832 panic("RAM parity error, likely hardware failure."); 833 } else if(isa_port & NMI_IOCHAN) { 834 panic("I/O channel check, likely hardware failure."); 835 } else if(eisa_port & ENMI_WATCHDOG) { 836 panic("EISA watchdog timer expired, likely hardware failure."); 837 } else if(eisa_port & ENMI_BUSTIMER) { 838 panic("EISA bus timeout, likely hardware failure."); 839 } else if(eisa_port & ENMI_IOSTATUS) { 840 panic("EISA I/O port status error."); 841 } else { 842 printf("\nNMI ISA %x, EISA %x\n", isa_port, eisa_port); 843 return(0); 844 } 845} 846 847/* 848 * Caught a stray interrupt, notify 849 */ 850static void 851isa_strayintr(d) 852 int d; 853{ 854 855 /* DON'T BOTHER FOR NOW! */ 856 /* for some reason, we get bursts of intr #7, even if not enabled! */ 857 /* 858 * Well the reason you got bursts of intr #7 is because someone 859 * raised an interrupt line and dropped it before the 8259 could 860 * prioritize it. This is documented in the intel data book. This 861 * means you have BAD hardware! I have changed this so that only 862 * the first 5 get logged, then it quits logging them, and puts 863 * out a special message. rgrimes 3/25/1993 864 */ 865 /* 866 * XXX TODO print a different message for #7 if it is for a 867 * glitch. Glitches can be distinguished from real #7's by 868 * testing that the in-service bit is _not_ set. The test 869 * must be done before sending an EOI so it can't be done if 870 * we are using AUTO_EOI_1. 871 */ 872 if (intrcnt[NR_DEVICES + d] <= 5) 873 log(LOG_ERR, "stray irq %d\n", d); 874 if (intrcnt[NR_DEVICES + d] == 5) 875 log(LOG_CRIT, 876 "too many stray irq %d's; not logging any more\n", d); 877} 878 879/* 880 * find an ISA device in a given isa_devtab_* table, given 881 * the table to search, the expected id_driver entry, and the unit number. 882 * 883 * this function is defined in isa_device.h, and this location is debatable; 884 * i put it there because it's useless w/o, and directly operates on 885 * the other stuff in that file. 886 * 887 */ 888 889struct isa_device *find_isadev(table, driverp, unit) 890 struct isa_device *table; 891 struct isa_driver *driverp; 892 int unit; 893{ 894 if (driverp == NULL) /* sanity check */ 895 return NULL; 896 897 while ((table->id_driver != driverp) || (table->id_unit != unit)) { 898 if (table->id_driver == 0) 899 return NULL; 900 901 table++; 902 } 903 904 return table; 905} 906 907/* 908 * Return nonzero if a (masked) irq is pending for a given device. 909 */ 910int 911isa_irq_pending(dvp) 912 struct isa_device *dvp; 913{ 914 unsigned id_irq; 915 916 id_irq = dvp->id_irq; 917 if (id_irq & 0xff) 918 return (inb(IO_ICU1) & id_irq); 919 return (inb(IO_ICU2) & (id_irq >> 8)); 920} 921 922int 923register_intr(intr, device_id, flags, handler, mask, unit) 924 int intr; 925 int device_id; 926 u_int flags; 927 inthand2_t *handler; 928 u_int mask; 929 int unit; 930{ 931 char *cp; 932 u_long ef; 933 int id; 934 935 if ((u_int)intr >= ICU_LEN || intr == 2 936 || (u_int)device_id >= NR_DEVICES) 937 return (EINVAL); 938 if (intr_handler[intr] != isa_strayintr) 939 return (EBUSY); 940 ef = read_eflags(); 941 disable_intr(); 942 intr_countp[intr] = &intrcnt[device_id]; 943 intr_handler[intr] = handler; 944 intr_mask[intr] = mask | (1 << intr); 945 intr_unit[intr] = unit; 946 setidt(ICU_OFFSET + intr, 947 flags & RI_FAST ? fastintr[intr] : slowintr[intr], 948 SDT_SYS386IGT, SEL_KPL); 949 write_eflags(ef); 950 for (cp = intrnames, id = 0; id <= device_id; id++) 951 while (*cp++ != '\0') 952 ; 953 if (cp > eintrnames) 954 return (0); 955 if (intr < 10) { 956 cp[-3] = intr + '0'; 957 cp[-2] = ' '; 958 } else { 959 cp[-3] = '1'; 960 cp[-2] = intr - 10 + '0'; 961 } 962 return (0); 963} 964 965static void 966register_imask(dvp, mask) 967 struct isa_device *dvp; 968 u_int mask; 969{ 970 if (dvp->id_alive && dvp->id_irq) { 971 int intr; 972 973 intr = ffs(dvp->id_irq) - 1; 974 intr_mask[intr] = mask | (1 <<intr); 975 } 976} 977 978int 979unregister_intr(intr, handler) 980 int intr; 981 inthand2_t *handler; 982{ 983 u_long ef; 984 985 if ((u_int)intr >= ICU_LEN || handler != intr_handler[intr]) 986 return (EINVAL); 987 ef = read_eflags(); 988 disable_intr(); 989 intr_countp[intr] = &intrcnt[NR_DEVICES + intr]; 990 intr_handler[intr] = isa_strayintr; 991 intr_mask[intr] = HWI_MASK | SWI_MASK; 992 intr_unit[intr] = intr; 993 setidt(ICU_OFFSET + intr, slowintr[intr], SDT_SYS386IGT, SEL_KPL); 994 write_eflags(ef); 995 return (0); 996} 997