isa.c revision 3258
17650Spsandoz/*- 27650Spsandoz * Copyright (c) 1991 The Regents of the University of California. 37650Spsandoz * All rights reserved. 47650Spsandoz * 57650Spsandoz * This code is derived from software contributed to Berkeley by 67650Spsandoz * William Jolitz. 77650Spsandoz * 87650Spsandoz * Redistribution and use in source and binary forms, with or without 97650Spsandoz * modification, are permitted provided that the following conditions 107650Spsandoz * are met: 117650Spsandoz * 1. Redistributions of source code must retain the above copyright 127650Spsandoz * notice, this list of conditions and the following disclaimer. 137650Spsandoz * 2. Redistributions in binary form must reproduce the above copyright 147650Spsandoz * notice, this list of conditions and the following disclaimer in the 157650Spsandoz * documentation and/or other materials provided with the distribution. 167650Spsandoz * 3. All advertising materials mentioning features or use of this software 177650Spsandoz * must display the following acknowledgement: 187650Spsandoz * This product includes software developed by the University of 197650Spsandoz * California, Berkeley and its contributors. 207650Spsandoz * 4. Neither the name of the University nor the names of its contributors 217650Spsandoz * may be used to endorse or promote products derived from this software 227650Spsandoz * without specific prior written permission. 237650Spsandoz * 247650Spsandoz * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 257650Spsandoz * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 267650Spsandoz * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 277650Spsandoz * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 287650Spsandoz * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 297650Spsandoz * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 307650Spsandoz * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 317650Spsandoz * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 327650Spsandoz * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 337650Spsandoz * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 347650Spsandoz * SUCH DAMAGE. 357650Spsandoz * 367650Spsandoz * from: @(#)isa.c 7.2 (Berkeley) 5/13/91 377650Spsandoz * $Id: isa.c,v 1.26 1994/09/30 05:35:55 swallace Exp $ 387650Spsandoz */ 397650Spsandoz 407650Spsandoz/* 417650Spsandoz * code to manage AT bus 427650Spsandoz * 437650Spsandoz * 92/08/18 Frank P. MacLachlan (fpm@crash.cts.com): 447650Spsandoz * Fixed uninitialized variable problem and added code to deal 457650Spsandoz * with DMA page boundaries in isa_dmarangecheck(). Fixed word 467650Spsandoz * mode DMA count compution and reorganized DMA setup code in 477650Spsandoz * isa_dmastart() 487650Spsandoz */ 497650Spsandoz 507650Spsandoz#include <sys/param.h> 517650Spsandoz#include <sys/systm.h> /* isn't it a joy */ 527650Spsandoz#include <sys/kernel.h> /* to have three of these */ 537650Spsandoz#include <sys/conf.h> 547650Spsandoz#include <sys/file.h> 557650Spsandoz#include <sys/buf.h> 567650Spsandoz#include <sys/uio.h> 577650Spsandoz#include <sys/syslog.h> 587650Spsandoz#include <sys/malloc.h> 597650Spsandoz#include <sys/rlist.h> 607650Spsandoz#include <machine/segments.h> 617650Spsandoz#include <vm/vm.h> 627650Spsandoz#include <machine/spl.h> 637650Spsandoz#include <i386/isa/isa_device.h> 647650Spsandoz#include <i386/isa/isa.h> 657650Spsandoz#include <i386/isa/icu.h> 667650Spsandoz#include <i386/isa/ic/i8237.h> 677650Spsandoz#include <i386/isa/ic/i8042.h> 687650Spsandoz#include "vector.h" 697650Spsandoz 707650Spsandoz/* 717650Spsandoz** Register definitions for DMA controller 1 (channels 0..3): 727650Spsandoz*/ 737650Spsandoz#define DMA1_CHN(c) (IO_DMA1 + 1*(2*(c))) /* addr reg for channel c */ 747650Spsandoz#define DMA1_SMSK (IO_DMA1 + 1*10) /* single mask register */ 757650Spsandoz#define DMA1_MODE (IO_DMA1 + 1*11) /* mode register */ 767650Spsandoz#define DMA1_FFC (IO_DMA1 + 1*12) /* clear first/last FF */ 777650Spsandoz 787650Spsandoz/* 797650Spsandoz** Register definitions for DMA controller 2 (channels 4..7): 807650Spsandoz*/ 817650Spsandoz#define DMA2_CHN(c) (IO_DMA2 + 2*(2*(c))) /* addr reg for channel c */ 827650Spsandoz#define DMA2_SMSK (IO_DMA2 + 2*10) /* single mask register */ 837650Spsandoz#define DMA2_MODE (IO_DMA2 + 2*11) /* mode register */ 847650Spsandoz#define DMA2_FFC (IO_DMA2 + 2*12) /* clear first/last FF */ 857650Spsandoz 867650Spsandoz/* 877650Spsandoz * Bits to specify the type and amount of conflict checking. 887650Spsandoz */ 897650Spsandoz#define CC_ATTACH (1 << 0) 907650Spsandoz#define CC_DRQ (1 << 1) 917650Spsandoz#define CC_IOADDR (1 << 2) 927650Spsandoz#define CC_IRQ (1 << 3) 937650Spsandoz#define CC_MEMADDR (1 << 4) 947650Spsandoz 957650Spsandoz/* 967650Spsandoz * XXX these defines should be in a central place. 977650Spsandoz */ 987650Spsandoz#define read_eflags() ({u_long ef; \ 997650Spsandoz __asm("pushfl; popl %0" : "=a" (ef)); \ 1007650Spsandoz ef; }) 1017650Spsandoz#define write_eflags(ef) __asm("pushl %0; popfl" : : "a" ((u_long)(ef))) 1027650Spsandoz 1037650Spsandozu_long *intr_countp[ICU_LEN]; 1047650Spsandozinthand2_t *intr_handler[ICU_LEN]; 1057650Spsandozu_int intr_mask[ICU_LEN]; 1067650Spsandozint intr_unit[ICU_LEN]; 1077650Spsandoz 1087650Spsandozstatic inthand_t *fastintr[ICU_LEN] = { 1097650Spsandoz &IDTVEC(fastintr0), &IDTVEC(fastintr1), 1107650Spsandoz &IDTVEC(fastintr2), &IDTVEC(fastintr3), 1117650Spsandoz &IDTVEC(fastintr4), &IDTVEC(fastintr5), 1127650Spsandoz &IDTVEC(fastintr6), &IDTVEC(fastintr7), 1137650Spsandoz &IDTVEC(fastintr8), &IDTVEC(fastintr9), 1147650Spsandoz &IDTVEC(fastintr10), &IDTVEC(fastintr11), 1157650Spsandoz &IDTVEC(fastintr12), &IDTVEC(fastintr13), 1167650Spsandoz &IDTVEC(fastintr14), &IDTVEC(fastintr15) 1177650Spsandoz}; 1187650Spsandoz 1197650Spsandozstatic inthand_t *slowintr[ICU_LEN] = { 1207650Spsandoz &IDTVEC(intr0), &IDTVEC(intr1), &IDTVEC(intr2), &IDTVEC(intr3), 1217650Spsandoz &IDTVEC(intr4), &IDTVEC(intr5), &IDTVEC(intr6), &IDTVEC(intr7), 1227650Spsandoz &IDTVEC(intr8), &IDTVEC(intr9), &IDTVEC(intr10), &IDTVEC(intr11), 1237650Spsandoz &IDTVEC(intr12), &IDTVEC(intr13), &IDTVEC(intr14), &IDTVEC(intr15) 1247650Spsandoz}; 1257650Spsandoz 1267650Spsandozstatic void config_isadev __P((struct isa_device *isdp, u_int *mp)); 1277650Spsandozstatic void conflict __P((struct isa_device *dvp, struct isa_device *tmpdvp, 1287650Spsandoz int item, char const *whatnot, char const *reason, 1297650Spsandoz char const *format)); 1307650Spsandozstatic int haveseen __P((struct isa_device *dvp, struct isa_device *tmpdvp, 1317650Spsandoz u_int checkbits)); 1327650Spsandozstatic int haveseen_isadev __P((struct isa_device *dvp, u_int checkbits)); 1337650Spsandozstatic inthand2_t isa_strayintr; 1347650Spsandozstatic void register_imask __P((struct isa_device *dvp, u_int mask)); 1357650Spsandoz 1367650Spsandoz/* 1377650Spsandoz * print a conflict message 1387650Spsandoz */ 1397650Spsandozstatic void 1407650Spsandozconflict(dvp, tmpdvp, item, whatnot, reason, format) 1417650Spsandoz struct isa_device *dvp; 1427650Spsandoz struct isa_device *tmpdvp; 1437650Spsandoz int item; 1447650Spsandoz char const *whatnot; 1457650Spsandoz char const *reason; 1467650Spsandoz char const *format; 1477650Spsandoz{ 1487650Spsandoz printf("%s%d not %sed due to %s conflict with %s%d at ", 1497650Spsandoz dvp->id_driver->name, dvp->id_unit, whatnot, reason, 1507650Spsandoz tmpdvp->id_driver->name, tmpdvp->id_unit); 1517650Spsandoz printf(format, item); 1527650Spsandoz printf("\n"); 1537650Spsandoz} 1547650Spsandoz 1557650Spsandoz/* 1567650Spsandoz * Check to see if things are alread in use, like IRQ's, I/O addresses 1577650Spsandoz * and Memory addresses. 1587650Spsandoz */ 1597650Spsandozstatic int 1607650Spsandozhaveseen(dvp, tmpdvp, checkbits) 1617650Spsandoz struct isa_device *dvp; 1627650Spsandoz struct isa_device *tmpdvp; 1637650Spsandoz u_int checkbits; 1647650Spsandoz{ 165 int status = 0; 166 167 /* 168 * Only check against devices that have already been found 169 */ 170 if (tmpdvp->id_alive) { 171 char const *whatnot; 172 173 whatnot = checkbits & CC_ATTACH ? "attach" : "prob"; 174 /* 175 * Check for I/O address conflict. We can only check the 176 * starting address of the device against the range of the 177 * device that has already been probed since we do not 178 * know how many I/O addresses this device uses. 179 */ 180 if (checkbits & CC_IOADDR && tmpdvp->id_alive != -1) { 181 if ((dvp->id_iobase >= tmpdvp->id_iobase) && 182 (dvp->id_iobase <= 183 (tmpdvp->id_iobase + tmpdvp->id_alive - 1))) { 184 conflict(dvp, tmpdvp, dvp->id_iobase, whatnot, 185 "I/O address", "0x%x"); 186 status = 1; 187 } 188 } 189 /* 190 * Check for Memory address conflict. We can check for 191 * range overlap, but it will not catch all cases since the 192 * driver may adjust the msize paramater during probe, for 193 * now we just check that the starting address does not 194 * fall within any allocated region. 195 * XXX could add a second check after the probe for overlap, 196 * since at that time we would know the full range. 197 * XXX KERNBASE is a hack, we should have vaddr in the table! 198 */ 199 if (checkbits & CC_MEMADDR && tmpdvp->id_maddr) { 200 if ((KERNBASE + dvp->id_maddr >= tmpdvp->id_maddr) && 201 (KERNBASE + dvp->id_maddr <= 202 (tmpdvp->id_maddr + tmpdvp->id_msize - 1))) { 203 conflict(dvp, tmpdvp, (int)dvp->id_maddr, 204 whatnot, "maddr", "0x%x"); 205 status = 1; 206 } 207 } 208 /* 209 * Check for IRQ conflicts. 210 */ 211 if (checkbits & CC_IRQ && tmpdvp->id_irq) { 212 if (tmpdvp->id_irq == dvp->id_irq) { 213 conflict(dvp, tmpdvp, ffs(dvp->id_irq) - 1, 214 whatnot, "irq", "%d"); 215 status = 1; 216 } 217 } 218 /* 219 * Check for DRQ conflicts. 220 */ 221 if (checkbits & CC_DRQ && tmpdvp->id_drq != -1) { 222 if (tmpdvp->id_drq == dvp->id_drq) { 223 conflict(dvp, tmpdvp, dvp->id_drq, whatnot, 224 "drq", "%d"); 225 status = 1; 226 } 227 } 228 } 229 return (status); 230} 231 232/* 233 * Search through all the isa_devtab_* tables looking for anything that 234 * conflicts with the current device. 235 */ 236static int 237haveseen_isadev(dvp, checkbits) 238 struct isa_device *dvp; 239 u_int checkbits; 240{ 241 struct isa_device *tmpdvp; 242 int status = 0; 243 244 for (tmpdvp = isa_devtab_tty; tmpdvp->id_driver; tmpdvp++) 245 status |= haveseen(dvp, tmpdvp, checkbits); 246 for (tmpdvp = isa_devtab_bio; tmpdvp->id_driver; tmpdvp++) 247 status |= haveseen(dvp, tmpdvp, checkbits); 248 for (tmpdvp = isa_devtab_net; tmpdvp->id_driver; tmpdvp++) 249 status |= haveseen(dvp, tmpdvp, checkbits); 250 for (tmpdvp = isa_devtab_null; tmpdvp->id_driver; tmpdvp++) 251 status |= haveseen(dvp, tmpdvp, checkbits); 252 return(status); 253} 254 255/* 256 * Configure all ISA devices 257 */ 258void 259isa_configure() { 260 struct isa_device *dvp; 261 262 splhigh(); 263 enable_intr(); 264 INTREN(IRQ_SLAVE); 265 printf("Probing for devices on the ISA bus:\n"); 266 for (dvp = isa_devtab_tty; dvp->id_driver; dvp++) 267 config_isadev(dvp, &tty_imask); 268 for (dvp = isa_devtab_bio; dvp->id_driver; dvp++) 269 config_isadev(dvp, &bio_imask); 270 for (dvp = isa_devtab_net; dvp->id_driver; dvp++) 271 config_isadev(dvp, &net_imask); 272 for (dvp = isa_devtab_null; dvp->id_driver; dvp++) 273 config_isadev(dvp, (u_int *)NULL); 274 bio_imask |= SWI_CLOCK_MASK; 275 net_imask |= SWI_NET_MASK; 276 tty_imask |= SWI_TTY_MASK; 277 278/* 279 * XXX we should really add the tty device to net_imask when the line is 280 * switched to SLIPDISC, and then remove it when it is switched away from 281 * SLIPDISC. No need to block out ALL ttys during a splimp when only one 282 * of them is running slip. 283 * 284 * XXX actually, blocking all ttys during a splimp doesn't matter so much 285 * with sio because the serial interrupt layer doesn't use tty_imask. Only 286 * non-serial ttys suffer. It's more stupid that ALL 'net's are blocked 287 * during spltty. 288 */ 289#include "sl.h" 290#if NSL > 0 291 net_imask |= tty_imask; 292 tty_imask = net_imask; 293#endif 294 /* bio_imask |= tty_imask ; can some tty devices use buffers? */ 295#ifdef DIAGNOSTIC 296 printf("bio_imask %x tty_imask %x net_imask %x\n", 297 bio_imask, tty_imask, net_imask); 298#endif 299 /* 300 * Finish initializing intr_mask[]. Note that the partly 301 * constructed masks aren't actually used since we're at splhigh. 302 * For fully dynamic initialization, register_intr() and 303 * unregister_intr() will have to adjust the masks for _all_ 304 * interrupts and for tty_imask, etc. 305 */ 306 for (dvp = isa_devtab_tty; dvp->id_driver; dvp++) 307 register_imask(dvp, tty_imask); 308 for (dvp = isa_devtab_bio; dvp->id_driver; dvp++) 309 register_imask(dvp, bio_imask); 310 for (dvp = isa_devtab_net; dvp->id_driver; dvp++) 311 register_imask(dvp, net_imask); 312 for (dvp = isa_devtab_null; dvp->id_driver; dvp++) 313 register_imask(dvp, SWI_CLOCK_MASK); 314 spl0(); 315} 316 317/* 318 * Configure an ISA device. 319 */ 320 321 322static void config_isadev_c(); 323 324static void 325config_isadev(isdp, mp) 326 struct isa_device *isdp; 327 u_int *mp; 328{ 329 config_isadev_c(isdp, mp, 0); 330} 331 332void 333reconfig_isadev(isdp, mp) 334 struct isa_device *isdp; 335 u_int *mp; 336{ 337 config_isadev_c(isdp, mp, 1); 338} 339 340static void 341config_isadev_c(isdp, mp, reconfig) 342 struct isa_device *isdp; 343 u_int *mp; 344 int reconfig; 345{ 346 u_int checkbits; 347 int id_alive; 348 int last_alive; 349 struct isa_driver *dp = isdp->id_driver; 350 351 checkbits = 0; 352#ifndef ALLOW_CONFLICT_IRQ 353 checkbits |= CC_IRQ; 354#endif 355#ifndef ALLOW_CONFLICT_DRQ 356 checkbits |= CC_DRQ; 357#endif 358#ifndef ALLOW_CONFLICT_IOADDR 359 checkbits |= CC_IOADDR; 360#endif 361#ifndef ALLOW_CONFLICT_MEMADDR 362 checkbits |= CC_MEMADDR; 363#endif 364 if (!reconfig && haveseen_isadev(isdp, checkbits)) 365 return; 366 if (!reconfig && isdp->id_maddr) { 367 isdp->id_maddr -= 0xa0000; /* XXX should be a define */ 368 isdp->id_maddr += atdevbase; 369 } 370 if (reconfig) { 371 last_alive = isdp->id_alive; 372 } 373 else { 374 last_alive = 0; 375 } 376 id_alive = (*dp->probe)(isdp); 377 if (id_alive) { 378 /* 379 * Only print the I/O address range if id_alive != -1 380 * Right now this is a temporary fix just for the new 381 * NPX code so that if it finds a 486 that can use trap 382 * 16 it will not report I/O addresses. 383 * Rod Grimes 04/26/94 384 */ 385 if (!isdp->id_reconfig) { 386 printf("%s%d", dp->name, isdp->id_unit); 387 if (id_alive != -1) { 388 printf(" at 0x%x", isdp->id_iobase); 389 if ((isdp->id_iobase + id_alive - 1) != 390 isdp->id_iobase) { 391 printf("-0x%x", 392 isdp->id_iobase + id_alive - 1); 393 } 394 } 395 if (isdp->id_irq) 396 printf(" irq %d", ffs(isdp->id_irq) - 1); 397 if (isdp->id_drq != -1) 398 printf(" drq %d", isdp->id_drq); 399 if (isdp->id_maddr) 400 printf(" maddr 0x%lx", kvtop(isdp->id_maddr)); 401 if (isdp->id_msize) 402 printf(" msize %d", isdp->id_msize); 403 if (isdp->id_flags) 404 printf(" flags 0x%x", isdp->id_flags); 405 if (isdp->id_iobase) { 406 if (isdp->id_iobase < 0x100) { 407 printf(" on motherboard\n"); 408 } else { 409 if (isdp->id_iobase >= 0x1000) { 410 printf (" on eisa\n"); 411 } else { 412 printf (" on isa\n"); 413 } 414 } 415 } 416 /* 417 * Check for conflicts again. The driver may have 418 * changed *dvp. We should weaken the early check 419 * since the driver may have been able to change 420 * *dvp to avoid conflicts if given a chance. We 421 * already skip the early check for IRQs and force 422 * a check for IRQs in the next group of checks. 423 */ 424#ifndef ALLOW_CONFLICT_IRQ 425 checkbits |= CC_IRQ; 426#endif 427 if (haveseen_isadev(isdp, checkbits)) 428 return; 429 isdp->id_alive = id_alive; 430 } 431 (*dp->attach)(isdp); 432 if (isdp->id_irq) { 433 if (mp) 434 INTRMASK(*mp, isdp->id_irq); 435 register_intr(ffs(isdp->id_irq) - 1, isdp->id_id, 436 isdp->id_ri_flags, isdp->id_intr, 437 mp ? *mp : 0, isdp->id_unit); 438 INTREN(isdp->id_irq); 439 } 440 } else { 441 if (isdp->id_reconfig) { 442 (*dp->attach)(isdp); /* reconfiguration attach */ 443 } 444 if (!last_alive) { 445 if (!isdp->id_reconfig) { 446 printf("%s%d not found", dp->name, isdp->id_unit); 447 if (isdp->id_iobase) { 448 printf(" at 0x%x", isdp->id_iobase); 449 } 450 printf("\n"); 451 } 452 } 453 else { 454 /* This code has not been tested.... */ 455 if (isdp->id_irq) { 456 INTRDIS(isdp->id_irq); 457 unregister_intr(ffs(isdp->id_irq) - 1, 458 isdp->id_intr); 459 if (mp) 460 INTRUNMASK(*mp, isdp->id_irq); 461 } 462 } 463 } 464} 465 466/* 467 * Fill in default interrupt table (in case of spuruious interrupt 468 * during configuration of kernel, setup interrupt control unit 469 */ 470void 471isa_defaultirq() 472{ 473 int i; 474 475 /* icu vectors */ 476 for (i = 0; i < ICU_LEN; i++) 477 unregister_intr(i, (inthand2_t *)NULL); 478 479 /* initialize 8259's */ 480 outb(IO_ICU1, 0x11); /* reset; program device, four bytes */ 481 outb(IO_ICU1+1, NRSVIDT); /* starting at this vector index */ 482 outb(IO_ICU1+1, 1<<2); /* slave on line 2 */ 483#ifdef AUTO_EOI_1 484 outb(IO_ICU1+1, 2 | 1); /* auto EOI, 8086 mode */ 485#else 486 outb(IO_ICU1+1, 1); /* 8086 mode */ 487#endif 488 outb(IO_ICU1+1, 0xff); /* leave interrupts masked */ 489 outb(IO_ICU1, 0x0a); /* default to IRR on read */ 490 outb(IO_ICU1, 0xc0 | (3 - 1)); /* pri order 3-7, 0-2 (com2 first) */ 491 492 outb(IO_ICU2, 0x11); /* reset; program device, four bytes */ 493 outb(IO_ICU2+1, NRSVIDT+8); /* staring at this vector index */ 494 outb(IO_ICU2+1,2); /* my slave id is 2 */ 495#ifdef AUTO_EOI_2 496 outb(IO_ICU2+1, 2 | 1); /* auto EOI, 8086 mode */ 497#else 498 outb(IO_ICU2+1,1); /* 8086 mode */ 499#endif 500 outb(IO_ICU2+1, 0xff); /* leave interrupts masked */ 501 outb(IO_ICU2, 0x0a); /* default to IRR on read */ 502} 503 504/* region of physical memory known to be contiguous */ 505vm_offset_t isaphysmem; 506static caddr_t dma_bounce[8]; /* XXX */ 507static char bounced[8]; /* XXX */ 508#define MAXDMASZ 512 /* XXX */ 509 510/* high byte of address is stored in this port for i-th dma channel */ 511static short dmapageport[8] = 512 { 0x87, 0x83, 0x81, 0x82, 0x8f, 0x8b, 0x89, 0x8a }; 513 514/* 515 * isa_dmacascade(): program 8237 DMA controller channel to accept 516 * external dma control by a board. 517 */ 518void isa_dmacascade(unsigned chan) 519{ 520 if (chan > 7) 521 panic("isa_dmacascade: impossible request"); 522 523 /* set dma channel mode, and set dma channel mode */ 524 if ((chan & 4) == 0) { 525 outb(DMA1_MODE, DMA37MD_CASCADE | chan); 526 outb(DMA1_SMSK, chan); 527 } else { 528 outb(DMA2_MODE, DMA37MD_CASCADE | (chan & 3)); 529 outb(DMA2_SMSK, chan & 3); 530 } 531} 532 533static int 534isa_dmarangecheck(caddr_t va, unsigned length, unsigned chan); 535 536/* 537 * isa_dmastart(): program 8237 DMA controller channel, avoid page alignment 538 * problems by using a bounce buffer. 539 */ 540void isa_dmastart(int flags, caddr_t addr, unsigned nbytes, unsigned chan) 541{ vm_offset_t phys; 542 int waport; 543 caddr_t newaddr; 544 545 if ( chan > 7 546 || (chan < 4 && nbytes > (1<<16)) 547 || (chan >= 4 && (nbytes > (1<<17) || (u_int)addr & 1))) 548 panic("isa_dmastart: impossible request"); 549 550 if (isa_dmarangecheck(addr, nbytes, chan)) { 551 if (dma_bounce[chan] == 0) 552 dma_bounce[chan] = 553 /*(caddr_t)malloc(MAXDMASZ, M_TEMP, M_WAITOK);*/ 554 (caddr_t) isaphysmem + NBPG*chan; 555 bounced[chan] = 1; 556 newaddr = dma_bounce[chan]; 557 *(int *) newaddr = 0; /* XXX */ 558 559 /* copy bounce buffer on write */ 560 if (!(flags & B_READ)) 561 bcopy(addr, newaddr, nbytes); 562 addr = newaddr; 563 } 564 565 /* translate to physical */ 566 phys = pmap_extract(pmap_kernel(), (vm_offset_t)addr); 567 568 if ((chan & 4) == 0) { 569 /* 570 * Program one of DMA channels 0..3. These are 571 * byte mode channels. 572 */ 573 /* set dma channel mode, and reset address ff */ 574 if (flags & B_READ) 575 outb(DMA1_MODE, DMA37MD_SINGLE|DMA37MD_WRITE|chan); 576 else 577 outb(DMA1_MODE, DMA37MD_SINGLE|DMA37MD_READ|chan); 578 outb(DMA1_FFC, 0); 579 580 /* send start address */ 581 waport = DMA1_CHN(chan); 582 outb(waport, phys); 583 outb(waport, phys>>8); 584 outb(dmapageport[chan], phys>>16); 585 586 /* send count */ 587 outb(waport + 1, --nbytes); 588 outb(waport + 1, nbytes>>8); 589 590 /* unmask channel */ 591 outb(DMA1_SMSK, chan); 592 } else { 593 /* 594 * Program one of DMA channels 4..7. These are 595 * word mode channels. 596 */ 597 /* set dma channel mode, and reset address ff */ 598 if (flags & B_READ) 599 outb(DMA2_MODE, DMA37MD_SINGLE|DMA37MD_WRITE|(chan&3)); 600 else 601 outb(DMA2_MODE, DMA37MD_SINGLE|DMA37MD_READ|(chan&3)); 602 outb(DMA2_FFC, 0); 603 604 /* send start address */ 605 waport = DMA2_CHN(chan - 4); 606 outb(waport, phys>>1); 607 outb(waport, phys>>9); 608 outb(dmapageport[chan], phys>>16); 609 610 /* send count */ 611 nbytes >>= 1; 612 outb(waport + 2, --nbytes); 613 outb(waport + 2, nbytes>>8); 614 615 /* unmask channel */ 616 outb(DMA2_SMSK, chan & 3); 617 } 618} 619 620void isa_dmadone(int flags, caddr_t addr, int nbytes, int chan) 621{ 622 623 /* copy bounce buffer on read */ 624 /*if ((flags & (B_PHYS|B_READ)) == (B_PHYS|B_READ))*/ 625 if (bounced[chan]) { 626 bcopy(dma_bounce[chan], addr, nbytes); 627 bounced[chan] = 0; 628 } 629} 630 631/* 632 * Check for problems with the address range of a DMA transfer 633 * (non-contiguous physical pages, outside of bus address space, 634 * crossing DMA page boundaries). 635 * Return true if special handling needed. 636 */ 637 638static int 639isa_dmarangecheck(caddr_t va, unsigned length, unsigned chan) { 640 vm_offset_t phys, priorpage = 0, endva; 641 u_int dma_pgmsk = (chan & 4) ? ~(128*1024-1) : ~(64*1024-1); 642 643 endva = (vm_offset_t)round_page(va + length); 644 for (; va < (caddr_t) endva ; va += NBPG) { 645 phys = trunc_page(pmap_extract(pmap_kernel(), (vm_offset_t)va)); 646#define ISARAM_END RAM_END 647 if (phys == 0) 648 panic("isa_dmacheck: no physical page present"); 649 if (phys >= ISARAM_END) 650 return (1); 651 if (priorpage) { 652 if (priorpage + NBPG != phys) 653 return (1); 654 /* check if crossing a DMA page boundary */ 655 if (((u_int)priorpage ^ (u_int)phys) & dma_pgmsk) 656 return (1); 657 } 658 priorpage = phys; 659 } 660 return (0); 661} 662 663/* head of queue waiting for physmem to become available */ 664struct buf isa_physmemq; 665 666/* blocked waiting for resource to become free for exclusive use */ 667static isaphysmemflag; 668/* if waited for and call requested when free (B_CALL) */ 669static void (*isaphysmemunblock)(); /* needs to be a list */ 670 671/* 672 * Allocate contiguous physical memory for transfer, returning 673 * a *virtual* address to region. May block waiting for resource. 674 * (assumed to be called at splbio()) 675 */ 676caddr_t 677isa_allocphysmem(caddr_t va, unsigned length, void (*func)()) { 678 679 isaphysmemunblock = func; 680 while (isaphysmemflag & B_BUSY) { 681 isaphysmemflag |= B_WANTED; 682 tsleep((caddr_t)&isaphysmemflag, PRIBIO, "isaphys", 0); 683 } 684 isaphysmemflag |= B_BUSY; 685 686 return((caddr_t)isaphysmem); 687} 688 689/* 690 * Free contiguous physical memory used for transfer. 691 * (assumed to be called at splbio()) 692 */ 693void 694isa_freephysmem(caddr_t va, unsigned length) { 695 696 isaphysmemflag &= ~B_BUSY; 697 if (isaphysmemflag & B_WANTED) { 698 isaphysmemflag &= B_WANTED; 699 wakeup((caddr_t)&isaphysmemflag); 700 if (isaphysmemunblock) 701 (*isaphysmemunblock)(); 702 } 703} 704 705#define NMI_PARITY (1 << 7) 706#define NMI_IOCHAN (1 << 6) 707#define ENMI_WATCHDOG (1 << 7) 708#define ENMI_BUSTIMER (1 << 6) 709#define ENMI_IOSTATUS (1 << 5) 710 711/* 712 * Handle a NMI, possibly a machine check. 713 * return true to panic system, false to ignore. 714 */ 715int 716isa_nmi(cd) 717 int cd; 718{ 719 int isa_port = inb(0x61); 720 int eisa_port = inb(0x461); 721 if(isa_port & NMI_PARITY) { 722 panic("RAM parity error, likely hardware failure."); 723 } else if(isa_port & NMI_IOCHAN) { 724 panic("I/O channel check, likely hardware failure."); 725 } else if(eisa_port & ENMI_WATCHDOG) { 726 panic("EISA watchdog timer expired, likely hardware failure."); 727 } else if(eisa_port & ENMI_BUSTIMER) { 728 panic("EISA bus timeout, likely hardware failure."); 729 } else if(eisa_port & ENMI_IOSTATUS) { 730 panic("EISA I/O port status error."); 731 } else { 732 printf("\nNMI ISA %x, EISA %x\n", isa_port, eisa_port); 733 return(0); 734 } 735} 736 737/* 738 * Caught a stray interrupt, notify 739 */ 740static void 741isa_strayintr(d) 742 int d; 743{ 744 745 /* DON'T BOTHER FOR NOW! */ 746 /* for some reason, we get bursts of intr #7, even if not enabled! */ 747 /* 748 * Well the reason you got bursts of intr #7 is because someone 749 * raised an interrupt line and dropped it before the 8259 could 750 * prioritize it. This is documented in the intel data book. This 751 * means you have BAD hardware! I have changed this so that only 752 * the first 5 get logged, then it quits logging them, and puts 753 * out a special message. rgrimes 3/25/1993 754 */ 755 /* 756 * XXX TODO print a different message for #7 if it is for a 757 * glitch. Glitches can be distinguished from real #7's by 758 * testing that the in-service bit is _not_ set. The test 759 * must be done before sending an EOI so it can't be done if 760 * we are using AUTO_EOI_1. 761 */ 762 if (intrcnt[NR_DEVICES + d] <= 5) 763 log(LOG_ERR, "stray irq %d\n", d); 764 if (intrcnt[NR_DEVICES + d] == 5) 765 log(LOG_CRIT, 766 "too many stray irq %d's; not logging any more\n", d); 767} 768 769/* 770 * find an ISA device in a given isa_devtab_* table, given 771 * the table to search, the expected id_driver entry, and the unit number. 772 * 773 * this function is defined in isa_device.h, and this location is debatable; 774 * i put it there because it's useless w/o, and directly operates on 775 * the other stuff in that file. 776 * 777 */ 778 779struct isa_device *find_isadev(table, driverp, unit) 780 struct isa_device *table; 781 struct isa_driver *driverp; 782 int unit; 783{ 784 if (driverp == NULL) /* sanity check */ 785 return NULL; 786 787 while ((table->id_driver != driverp) || (table->id_unit != unit)) { 788 if (table->id_driver == 0) 789 return NULL; 790 791 table++; 792 } 793 794 return table; 795} 796 797/* 798 * Return nonzero if a (masked) irq is pending for a given device. 799 */ 800int 801isa_irq_pending(dvp) 802 struct isa_device *dvp; 803{ 804 unsigned id_irq; 805 806 id_irq = dvp->id_irq; 807 if (id_irq & 0xff) 808 return (inb(IO_ICU1) & id_irq); 809 return (inb(IO_ICU2) & (id_irq >> 8)); 810} 811 812int 813register_intr(intr, device_id, flags, handler, mask, unit) 814 int intr; 815 int device_id; 816 u_int flags; 817 inthand2_t *handler; 818 u_int mask; 819 int unit; 820{ 821 char *cp; 822 u_long ef; 823 int id; 824 825 if ((u_int)intr >= ICU_LEN || intr == 2 826 || (u_int)device_id >= NR_DEVICES) 827 return (EINVAL); 828 if (intr_handler[intr] != isa_strayintr) 829 return (EBUSY); 830 ef = read_eflags(); 831 disable_intr(); 832 intr_countp[intr] = &intrcnt[device_id]; 833 intr_handler[intr] = handler; 834 intr_mask[intr] = mask | (1 << intr); 835 intr_unit[intr] = unit; 836 setidt(ICU_OFFSET + intr, 837 flags & RI_FAST ? fastintr[intr] : slowintr[intr], 838 SDT_SYS386IGT, SEL_KPL); 839 write_eflags(ef); 840 for (cp = intrnames, id = 0; id <= device_id; id++) 841 while (*cp++ != '\0') 842 ; 843 if (cp > eintrnames) 844 return (0); 845 if (intr < 10) { 846 cp[-3] = intr + '0'; 847 cp[-2] = ' '; 848 } else { 849 cp[-3] = '1'; 850 cp[-2] = intr - 10 + '0'; 851 } 852 return (0); 853} 854 855static void 856register_imask(dvp, mask) 857 struct isa_device *dvp; 858 u_int mask; 859{ 860 if (dvp->id_alive && dvp->id_irq) { 861 int intr; 862 863 intr = ffs(dvp->id_irq) - 1; 864 intr_mask[intr] = mask | (1 <<intr); 865 } 866} 867 868int 869unregister_intr(intr, handler) 870 int intr; 871 inthand2_t *handler; 872{ 873 u_long ef; 874 875 if ((u_int)intr >= ICU_LEN || handler != intr_handler[intr]) 876 return (EINVAL); 877 ef = read_eflags(); 878 disable_intr(); 879 intr_countp[intr] = &intrcnt[NR_DEVICES + intr]; 880 intr_handler[intr] = isa_strayintr; 881 intr_mask[intr] = HWI_MASK | SWI_MASK; 882 intr_unit[intr] = intr; 883 setidt(ICU_OFFSET + intr, slowintr[intr], SDT_SYS386IGT, SEL_KPL); 884 write_eflags(ef); 885 return (0); 886} 887