isa.c revision 13644
1139749Simp/*- 2131901Smarcel * Copyright (c) 1991 The Regents of the University of California. 3131901Smarcel * All rights reserved. 4131901Smarcel * 5131901Smarcel * This code is derived from software contributed to Berkeley by 6131901Smarcel * William Jolitz. 7131901Smarcel * 8131901Smarcel * Redistribution and use in source and binary forms, with or without 9131901Smarcel * modification, are permitted provided that the following conditions 10131901Smarcel * are met: 11131901Smarcel * 1. Redistributions of source code must retain the above copyright 12131901Smarcel * notice, this list of conditions and the following disclaimer. 13131901Smarcel * 2. Redistributions in binary form must reproduce the above copyright 14131901Smarcel * notice, this list of conditions and the following disclaimer in the 15131901Smarcel * documentation and/or other materials provided with the distribution. 16131901Smarcel * 3. All advertising materials mentioning features or use of this software 17131901Smarcel * must display the following acknowledgement: 18131901Smarcel * This product includes software developed by the University of 19131901Smarcel * California, Berkeley and its contributors. 20131901Smarcel * 4. Neither the name of the University nor the names of its contributors 21131901Smarcel * may be used to endorse or promote products derived from this software 22131901Smarcel * without specific prior written permission. 23131901Smarcel * 24131901Smarcel * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25131901Smarcel * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26131901Smarcel * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27131901Smarcel * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28131901Smarcel * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29131901Smarcel * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30131901Smarcel * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31131901Smarcel * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32131901Smarcel * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33131901Smarcel * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34131901Smarcel * SUCH DAMAGE. 35131901Smarcel * 36131901Smarcel * from: @(#)isa.c 7.2 (Berkeley) 5/13/91 37131901Smarcel * $Id: isa.c,v 1.61 1996/01/19 23:38:06 phk Exp $ 38131901Smarcel */ 39131901Smarcel 40131901Smarcel/* 41131901Smarcel * code to manage AT bus 42131901Smarcel * 43131901Smarcel * 92/08/18 Frank P. MacLachlan (fpm@crash.cts.com): 44131901Smarcel * Fixed uninitialized variable problem and added code to deal 45131901Smarcel * with DMA page boundaries in isa_dmarangecheck(). Fixed word 46131901Smarcel * mode DMA count compution and reorganized DMA setup code in 47131901Smarcel * isa_dmastart() 48158950Sphk */ 49131901Smarcel 50131901Smarcel#include <sys/param.h> 51131901Smarcel#include <sys/systm.h> 52131901Smarcel#include <sys/sysctl.h> 53131901Smarcel#include <sys/buf.h> 54131901Smarcel#include <sys/syslog.h> 55131901Smarcel#include <sys/malloc.h> 56131901Smarcel#include <machine/segments.h> 57131901Smarcel#include <vm/vm.h> 58131901Smarcel#include <vm/vm_param.h> 59131901Smarcel#include <vm/pmap.h> 60131901Smarcel#include <machine/cpu.h> 61131901Smarcel#include <i386/isa/isa_device.h> 62131901Smarcel#include <i386/isa/isa.h> 63131901Smarcel#include <i386/isa/icu.h> 64131901Smarcel#include <i386/isa/ic/i8237.h> 65131901Smarcel#include <sys/devconf.h> 66131901Smarcel#include "vector.h" 67131901Smarcel 68131901Smarcel/* 69131901Smarcel** Register definitions for DMA controller 1 (channels 0..3): 70131901Smarcel*/ 71131901Smarcel#define DMA1_CHN(c) (IO_DMA1 + 1*(2*(c))) /* addr reg for channel c */ 72131901Smarcel#define DMA1_SMSK (IO_DMA1 + 1*10) /* single mask register */ 73131901Smarcel#define DMA1_MODE (IO_DMA1 + 1*11) /* mode register */ 74131901Smarcel#define DMA1_FFC (IO_DMA1 + 1*12) /* clear first/last FF */ 75131901Smarcel 76131901Smarcel/* 77131901Smarcel** Register definitions for DMA controller 2 (channels 4..7): 78131901Smarcel*/ 79131901Smarcel#define DMA2_CHN(c) (IO_DMA2 + 2*(2*(c))) /* addr reg for channel c */ 80131901Smarcel#define DMA2_SMSK (IO_DMA2 + 2*10) /* single mask register */ 81131901Smarcel#define DMA2_MODE (IO_DMA2 + 2*11) /* mode register */ 82131901Smarcel#define DMA2_FFC (IO_DMA2 + 2*12) /* clear first/last FF */ 83131901Smarcel 84131901Smarcelu_long *intr_countp[ICU_LEN]; 85131901Smarcelinthand2_t *intr_handler[ICU_LEN]; 86131901Smarcelu_int intr_mask[ICU_LEN]; 87131901Smarcelu_int* intr_mptr[ICU_LEN]; 88131901Smarcelint intr_unit[ICU_LEN]; 89158950Sphk 90131901Smarcelextern struct kern_devconf kdc_cpu0; 91131901Smarcel 92131901Smarcelstruct kern_devconf kdc_isa0 = { 93131901Smarcel 0, 0, 0, /* filled in by dev_attach */ 94 "isa", 0, { MDDT_BUS, 0 }, 95 0, 0, 0, BUS_EXTERNALLEN, 96 &kdc_cpu0, /* parent is the CPU */ 97 0, /* no parentdata */ 98 DC_BUSY, /* busses are always busy */ 99 "ISA or EISA bus", 100 DC_CLS_BUS /* class */ 101}; 102 103static inthand_t *fastintr[ICU_LEN] = { 104 &IDTVEC(fastintr0), &IDTVEC(fastintr1), 105 &IDTVEC(fastintr2), &IDTVEC(fastintr3), 106 &IDTVEC(fastintr4), &IDTVEC(fastintr5), 107 &IDTVEC(fastintr6), &IDTVEC(fastintr7), 108 &IDTVEC(fastintr8), &IDTVEC(fastintr9), 109 &IDTVEC(fastintr10), &IDTVEC(fastintr11), 110 &IDTVEC(fastintr12), &IDTVEC(fastintr13), 111 &IDTVEC(fastintr14), &IDTVEC(fastintr15) 112}; 113 114static inthand_t *slowintr[ICU_LEN] = { 115 &IDTVEC(intr0), &IDTVEC(intr1), &IDTVEC(intr2), &IDTVEC(intr3), 116 &IDTVEC(intr4), &IDTVEC(intr5), &IDTVEC(intr6), &IDTVEC(intr7), 117 &IDTVEC(intr8), &IDTVEC(intr9), &IDTVEC(intr10), &IDTVEC(intr11), 118 &IDTVEC(intr12), &IDTVEC(intr13), &IDTVEC(intr14), &IDTVEC(intr15) 119}; 120 121static void config_isadev __P((struct isa_device *isdp, u_int *mp)); 122static void config_isadev_c __P((struct isa_device *isdp, u_int *mp, 123 int reconfig)); 124static void conflict __P((struct isa_device *dvp, struct isa_device *tmpdvp, 125 int item, char const *whatnot, char const *reason, 126 char const *format)); 127static int haveseen __P((struct isa_device *dvp, struct isa_device *tmpdvp, 128 u_int checkbits)); 129static int isa_dmarangecheck __P((caddr_t va, unsigned length, unsigned chan)); 130static inthand2_t isa_strayintr; 131static void register_imask __P((struct isa_device *dvp, u_int mask)); 132 133/* 134 * print a conflict message 135 */ 136static void 137conflict(dvp, tmpdvp, item, whatnot, reason, format) 138 struct isa_device *dvp; 139 struct isa_device *tmpdvp; 140 int item; 141 char const *whatnot; 142 char const *reason; 143 char const *format; 144{ 145 printf("%s%d not %sed due to %s conflict with %s%d at ", 146 dvp->id_driver->name, dvp->id_unit, whatnot, reason, 147 tmpdvp->id_driver->name, tmpdvp->id_unit); 148 printf(format, item); 149 printf("\n"); 150} 151 152/* 153 * Check to see if things are already in use, like IRQ's, I/O addresses 154 * and Memory addresses. 155 */ 156static int 157haveseen(dvp, tmpdvp, checkbits) 158 struct isa_device *dvp; 159 struct isa_device *tmpdvp; 160 u_int checkbits; 161{ 162 /* 163 * Only check against devices that have already been found and are not 164 * unilaterally allowed to conflict anyway. 165 */ 166 if (tmpdvp->id_alive && !dvp->id_conflicts) { 167 char const *whatnot; 168 169 whatnot = checkbits & CC_ATTACH ? "attach" : "prob"; 170 /* 171 * Check for I/O address conflict. We can only check the 172 * starting address of the device against the range of the 173 * device that has already been probed since we do not 174 * know how many I/O addresses this device uses. 175 */ 176 if (checkbits & CC_IOADDR && tmpdvp->id_alive != -1) { 177 if ((dvp->id_iobase >= tmpdvp->id_iobase) && 178 (dvp->id_iobase <= 179 (tmpdvp->id_iobase + tmpdvp->id_alive - 1))) { 180 conflict(dvp, tmpdvp, dvp->id_iobase, whatnot, 181 "I/O address", "0x%x"); 182 return 1; 183 } 184 } 185 /* 186 * Check for Memory address conflict. We can check for 187 * range overlap, but it will not catch all cases since the 188 * driver may adjust the msize paramater during probe, for 189 * now we just check that the starting address does not 190 * fall within any allocated region. 191 * XXX could add a second check after the probe for overlap, 192 * since at that time we would know the full range. 193 * XXX KERNBASE is a hack, we should have vaddr in the table! 194 */ 195 if (checkbits & CC_MEMADDR && tmpdvp->id_maddr) { 196 if ((KERNBASE + dvp->id_maddr >= tmpdvp->id_maddr) && 197 (KERNBASE + dvp->id_maddr <= 198 (tmpdvp->id_maddr + tmpdvp->id_msize - 1))) { 199 conflict(dvp, tmpdvp, (int)dvp->id_maddr, 200 whatnot, "maddr", "0x%x"); 201 return 1; 202 } 203 } 204 /* 205 * Check for IRQ conflicts. 206 */ 207 if (checkbits & CC_IRQ && tmpdvp->id_irq) { 208 if (tmpdvp->id_irq == dvp->id_irq) { 209 conflict(dvp, tmpdvp, ffs(dvp->id_irq) - 1, 210 whatnot, "irq", "%d"); 211 return 1; 212 } 213 } 214 /* 215 * Check for DRQ conflicts. 216 */ 217 if (checkbits & CC_DRQ && tmpdvp->id_drq != -1) { 218 if (tmpdvp->id_drq == dvp->id_drq) { 219 conflict(dvp, tmpdvp, dvp->id_drq, whatnot, 220 "drq", "%d"); 221 return 1; 222 } 223 } 224 } 225 return 0; 226} 227 228/* 229 * Search through all the isa_devtab_* tables looking for anything that 230 * conflicts with the current device. 231 */ 232int 233haveseen_isadev(dvp, checkbits) 234 struct isa_device *dvp; 235 u_int checkbits; 236{ 237 struct isa_device *tmpdvp; 238 int status = 0; 239 240 for (tmpdvp = isa_devtab_tty; tmpdvp->id_driver; tmpdvp++) { 241 status |= haveseen(dvp, tmpdvp, checkbits); 242 if (status) 243 return status; 244 } 245 for (tmpdvp = isa_devtab_bio; tmpdvp->id_driver; tmpdvp++) { 246 status |= haveseen(dvp, tmpdvp, checkbits); 247 if (status) 248 return status; 249 } 250 for (tmpdvp = isa_devtab_net; tmpdvp->id_driver; tmpdvp++) { 251 status |= haveseen(dvp, tmpdvp, checkbits); 252 if (status) 253 return status; 254 } 255 for (tmpdvp = isa_devtab_null; tmpdvp->id_driver; tmpdvp++) { 256 status |= haveseen(dvp, tmpdvp, checkbits); 257 if (status) 258 return status; 259 } 260 return(status); 261} 262 263/* 264 * Configure all ISA devices 265 */ 266void 267isa_configure() { 268 struct isa_device *dvp; 269 270 dev_attach(&kdc_isa0); 271 272 splhigh(); 273 enable_intr(); 274 INTREN(IRQ_SLAVE); 275 printf("Probing for devices on the ISA bus:\n"); 276 /* First probe all the sensitive probes */ 277 for (dvp = isa_devtab_tty; dvp->id_driver; dvp++) 278 if (dvp->id_driver->sensitive_hw) 279 config_isadev(dvp, &tty_imask); 280 for (dvp = isa_devtab_bio; dvp->id_driver; dvp++) 281 if (dvp->id_driver->sensitive_hw) 282 config_isadev(dvp, &bio_imask); 283 for (dvp = isa_devtab_net; dvp->id_driver; dvp++) 284 if (dvp->id_driver->sensitive_hw) 285 config_isadev(dvp, &net_imask); 286 for (dvp = isa_devtab_null; dvp->id_driver; dvp++) 287 if (dvp->id_driver->sensitive_hw) 288 config_isadev(dvp, (u_int *)NULL); 289 290 /* Then all the bad ones */ 291 for (dvp = isa_devtab_tty; dvp->id_driver; dvp++) 292 if (!dvp->id_driver->sensitive_hw) 293 config_isadev(dvp, &tty_imask); 294 for (dvp = isa_devtab_bio; dvp->id_driver; dvp++) 295 if (!dvp->id_driver->sensitive_hw) 296 config_isadev(dvp, &bio_imask); 297 for (dvp = isa_devtab_net; dvp->id_driver; dvp++) 298 if (!dvp->id_driver->sensitive_hw) 299 config_isadev(dvp, &net_imask); 300 for (dvp = isa_devtab_null; dvp->id_driver; dvp++) 301 if (!dvp->id_driver->sensitive_hw) 302 config_isadev(dvp, (u_int *)NULL); 303 304 bio_imask |= SWI_CLOCK_MASK; 305 net_imask |= SWI_NET_MASK; 306 tty_imask |= SWI_TTY_MASK; 307 308/* 309 * XXX we should really add the tty device to net_imask when the line is 310 * switched to SLIPDISC, and then remove it when it is switched away from 311 * SLIPDISC. No need to block out ALL ttys during a splimp when only one 312 * of them is running slip. 313 * 314 * XXX actually, blocking all ttys during a splimp doesn't matter so much 315 * with sio because the serial interrupt layer doesn't use tty_imask. Only 316 * non-serial ttys suffer. It's more stupid that ALL 'net's are blocked 317 * during spltty. 318 */ 319#include "sl.h" 320#if NSL > 0 321 net_imask |= tty_imask; 322 tty_imask = net_imask; 323#endif 324 325 /* bio_imask |= tty_imask ; can some tty devices use buffers? */ 326 327 if (bootverbose) 328 printf("imasks: bio %x, tty %x, net %x\n", 329 bio_imask, tty_imask, net_imask); 330 331 /* 332 * Finish initializing intr_mask[]. Note that the partly 333 * constructed masks aren't actually used since we're at splhigh. 334 * For fully dynamic initialization, register_intr() and 335 * unregister_intr() will have to adjust the masks for _all_ 336 * interrupts and for tty_imask, etc. 337 */ 338 for (dvp = isa_devtab_tty; dvp->id_driver; dvp++) 339 register_imask(dvp, tty_imask); 340 for (dvp = isa_devtab_bio; dvp->id_driver; dvp++) 341 register_imask(dvp, bio_imask); 342 for (dvp = isa_devtab_net; dvp->id_driver; dvp++) 343 register_imask(dvp, net_imask); 344 for (dvp = isa_devtab_null; dvp->id_driver; dvp++) 345 register_imask(dvp, SWI_CLOCK_MASK); 346 spl0(); 347} 348 349/* 350 * Configure an ISA device. 351 */ 352 353 354static void 355config_isadev(isdp, mp) 356 struct isa_device *isdp; 357 u_int *mp; 358{ 359 config_isadev_c(isdp, mp, 0); 360} 361 362void 363reconfig_isadev(isdp, mp) 364 struct isa_device *isdp; 365 u_int *mp; 366{ 367 config_isadev_c(isdp, mp, 1); 368} 369 370static void 371config_isadev_c(isdp, mp, reconfig) 372 struct isa_device *isdp; 373 u_int *mp; 374 int reconfig; 375{ 376 u_int checkbits; 377 int id_alive; 378 int last_alive; 379 struct isa_driver *dp = isdp->id_driver; 380 381 if (!isdp->id_enabled) { 382 printf("%s%d: disabled, not probed.\n", 383 dp->name, isdp->id_unit); 384 return; 385 } 386 checkbits = CC_DRQ | CC_IOADDR | CC_MEMADDR; 387 if (!reconfig && haveseen_isadev(isdp, checkbits)) 388 return; 389 if (!reconfig && isdp->id_maddr) { 390 isdp->id_maddr -= 0xa0000; /* XXX should be a define */ 391 isdp->id_maddr += atdevbase; 392 } 393 if (reconfig) { 394 last_alive = isdp->id_alive; 395 isdp->id_reconfig = 1; 396 } 397 else { 398 last_alive = 0; 399 isdp->id_reconfig = 0; 400 } 401 id_alive = (*dp->probe)(isdp); 402 if (id_alive) { 403 /* 404 * Only print the I/O address range if id_alive != -1 405 * Right now this is a temporary fix just for the new 406 * NPX code so that if it finds a 486 that can use trap 407 * 16 it will not report I/O addresses. 408 * Rod Grimes 04/26/94 409 */ 410 if (!isdp->id_reconfig) { 411 printf("%s%d", dp->name, isdp->id_unit); 412 if (id_alive != -1) { 413 printf(" at 0x%x", isdp->id_iobase); 414 if (isdp->id_iobase + id_alive - 1 != 415 isdp->id_iobase) { 416 printf("-0x%x", 417 isdp->id_iobase + id_alive - 1); 418 } 419 } 420 if (isdp->id_irq) 421 printf(" irq %d", ffs(isdp->id_irq) - 1); 422 if (isdp->id_drq != -1) 423 printf(" drq %d", isdp->id_drq); 424 if (isdp->id_maddr) 425 printf(" maddr 0x%lx", kvtop(isdp->id_maddr)); 426 if (isdp->id_msize) 427 printf(" msize %d", isdp->id_msize); 428 if (isdp->id_flags) 429 printf(" flags 0x%x", isdp->id_flags); 430 if (isdp->id_iobase && !(isdp->id_iobase & 0xf300)) { 431 printf(" on motherboard"); 432 } else if (isdp->id_iobase >= 0x1000 && 433 !(isdp->id_iobase & 0x300)) { 434 printf (" on eisa slot %d", 435 isdp->id_iobase >> 12); 436 } else { 437 printf (" on isa"); 438 } 439 printf("\n"); 440 /* 441 * Check for conflicts again. The driver may have 442 * changed *dvp. We should weaken the early check 443 * since the driver may have been able to change 444 * *dvp to avoid conflicts if given a chance. We 445 * already skip the early check for IRQs and force 446 * a check for IRQs in the next group of checks. 447 */ 448 checkbits |= CC_IRQ; 449 if (haveseen_isadev(isdp, checkbits)) 450 return; 451 isdp->id_alive = id_alive; 452 } 453 (*dp->attach)(isdp); 454 if (isdp->id_irq) { 455 if (mp) 456 INTRMASK(*mp, isdp->id_irq); 457 register_intr(ffs(isdp->id_irq) - 1, isdp->id_id, 458 isdp->id_ri_flags, isdp->id_intr, 459 mp, isdp->id_unit); 460 INTREN(isdp->id_irq); 461 } 462 } else { 463 if (isdp->id_reconfig) { 464 (*dp->attach)(isdp); /* reconfiguration attach */ 465 } 466 if (!last_alive) { 467 if (!isdp->id_reconfig) { 468 printf("%s%d not found", 469 dp->name, isdp->id_unit); 470 if (isdp->id_iobase) { 471 printf(" at 0x%x", isdp->id_iobase); 472 } 473 printf("\n"); 474 } 475 } 476 else { 477 /* This code has not been tested.... */ 478 if (isdp->id_irq) { 479 INTRDIS(isdp->id_irq); 480 unregister_intr(ffs(isdp->id_irq) - 1, 481 isdp->id_intr); 482 if (mp) 483 INTRUNMASK(*mp, isdp->id_irq); 484 } 485 } 486 } 487} 488 489/* 490 * Provide ISA-specific device information to user programs using the 491 * hw.devconf interface. 492 */ 493int 494isa_externalize(struct isa_device *id, struct sysctl_req *req) 495{ 496 return (SYSCTL_OUT(req, id, sizeof *id)); 497} 498 499/* 500 * This is used to forcibly reconfigure an ISA device. It currently just 501 * returns an error 'cos you can't do that yet. It is here to demonstrate 502 * what the `internalize' routine is supposed to do. 503 */ 504int 505isa_internalize(struct isa_device *id, struct sysctl_req *req) 506{ 507 struct isa_device myid; 508 int rv; 509 510 rv = SYSCTL_IN(req, &myid, sizeof *id); 511 if(rv) 512 return rv; 513 514 rv = EOPNOTSUPP; 515 /* code would go here to validate the configuration request */ 516 /* code would go here to actually perform the reconfiguration */ 517 return rv; 518} 519 520int 521isa_generic_externalize(struct kern_devconf *kdc, struct sysctl_req *req) 522{ 523 return isa_externalize(kdc->kdc_isa, req); 524} 525 526/* 527 * Fill in default interrupt table (in case of spuruious interrupt 528 * during configuration of kernel, setup interrupt control unit 529 */ 530void 531isa_defaultirq() 532{ 533 int i; 534 535 /* icu vectors */ 536 for (i = 0; i < ICU_LEN; i++) 537 unregister_intr(i, (inthand2_t *)NULL); 538 539 /* initialize 8259's */ 540 outb(IO_ICU1, 0x11); /* reset; program device, four bytes */ 541 outb(IO_ICU1+1, NRSVIDT); /* starting at this vector index */ 542 outb(IO_ICU1+1, 1<<2); /* slave on line 2 */ 543#ifdef AUTO_EOI_1 544 outb(IO_ICU1+1, 2 | 1); /* auto EOI, 8086 mode */ 545#else 546 outb(IO_ICU1+1, 1); /* 8086 mode */ 547#endif 548 outb(IO_ICU1+1, 0xff); /* leave interrupts masked */ 549 outb(IO_ICU1, 0x0a); /* default to IRR on read */ 550 outb(IO_ICU1, 0xc0 | (3 - 1)); /* pri order 3-7, 0-2 (com2 first) */ 551 552 outb(IO_ICU2, 0x11); /* reset; program device, four bytes */ 553 outb(IO_ICU2+1, NRSVIDT+8); /* staring at this vector index */ 554 outb(IO_ICU2+1,2); /* my slave id is 2 */ 555#ifdef AUTO_EOI_2 556 outb(IO_ICU2+1, 2 | 1); /* auto EOI, 8086 mode */ 557#else 558 outb(IO_ICU2+1,1); /* 8086 mode */ 559#endif 560 outb(IO_ICU2+1, 0xff); /* leave interrupts masked */ 561 outb(IO_ICU2, 0x0a); /* default to IRR on read */ 562} 563 564/* region of physical memory known to be contiguous */ 565vm_offset_t isaphysmem; 566static caddr_t dma_bounce[8]; /* XXX */ 567static char bounced[8]; /* XXX */ 568#define MAXDMASZ 512 /* XXX */ 569 570/* high byte of address is stored in this port for i-th dma channel */ 571static short dmapageport[8] = 572 { 0x87, 0x83, 0x81, 0x82, 0x8f, 0x8b, 0x89, 0x8a }; 573 574/* 575 * isa_dmacascade(): program 8237 DMA controller channel to accept 576 * external dma control by a board. 577 */ 578void isa_dmacascade(unsigned chan) 579{ 580 if (chan > 7) 581 panic("isa_dmacascade: impossible request"); 582 583 /* set dma channel mode, and set dma channel mode */ 584 if ((chan & 4) == 0) { 585 outb(DMA1_MODE, DMA37MD_CASCADE | chan); 586 outb(DMA1_SMSK, chan); 587 } else { 588 outb(DMA2_MODE, DMA37MD_CASCADE | (chan & 3)); 589 outb(DMA2_SMSK, chan & 3); 590 } 591} 592 593/* 594 * isa_dmastart(): program 8237 DMA controller channel, avoid page alignment 595 * problems by using a bounce buffer. 596 */ 597void isa_dmastart(int flags, caddr_t addr, unsigned nbytes, unsigned chan) 598{ vm_offset_t phys; 599 int waport; 600 caddr_t newaddr; 601 602 if ( chan > 7 603 || (chan < 4 && nbytes > (1<<16)) 604 || (chan >= 4 && (nbytes > (1<<17) || (u_int)addr & 1))) 605 panic("isa_dmastart: impossible request"); 606 607 if (isa_dmarangecheck(addr, nbytes, chan)) { 608 if (dma_bounce[chan] == 0) 609 dma_bounce[chan] = 610 (caddr_t) isaphysmem + NBPG*chan; 611 bounced[chan] = 1; 612 newaddr = dma_bounce[chan]; 613 *(int *) newaddr = 0; /* XXX */ 614 615 /* copy bounce buffer on write */ 616 if (!(flags & B_READ)) 617 bcopy(addr, newaddr, nbytes); 618 addr = newaddr; 619 } 620 621 /* translate to physical */ 622 phys = pmap_extract(pmap_kernel(), (vm_offset_t)addr); 623 624 if ((chan & 4) == 0) { 625 /* 626 * Program one of DMA channels 0..3. These are 627 * byte mode channels. 628 */ 629 /* set dma channel mode, and reset address ff */ 630 631 /* If B_RAW flag is set, then use autoinitialise mode */ 632 if (flags & B_RAW) { 633 if (flags & B_READ) 634 outb(DMA1_MODE, DMA37MD_AUTO|DMA37MD_WRITE|chan); 635 else 636 outb(DMA1_MODE, DMA37MD_AUTO|DMA37MD_READ|chan); 637 } 638 else 639 if (flags & B_READ) 640 outb(DMA1_MODE, DMA37MD_SINGLE|DMA37MD_WRITE|chan); 641 else 642 outb(DMA1_MODE, DMA37MD_SINGLE|DMA37MD_READ|chan); 643 outb(DMA1_FFC, 0); 644 645 /* send start address */ 646 waport = DMA1_CHN(chan); 647 outb(waport, phys); 648 outb(waport, phys>>8); 649 outb(dmapageport[chan], phys>>16); 650 651 /* send count */ 652 outb(waport + 1, --nbytes); 653 outb(waport + 1, nbytes>>8); 654 655 /* unmask channel */ 656 outb(DMA1_SMSK, chan); 657 } else { 658 /* 659 * Program one of DMA channels 4..7. These are 660 * word mode channels. 661 */ 662 /* set dma channel mode, and reset address ff */ 663 664 /* If B_RAW flag is set, then use autoinitialise mode */ 665 if (flags & B_RAW) { 666 if (flags & B_READ) 667 outb(DMA2_MODE, DMA37MD_AUTO|DMA37MD_WRITE|(chan&3)); 668 else 669 outb(DMA2_MODE, DMA37MD_AUTO|DMA37MD_READ|(chan&3)); 670 } 671 else 672 if (flags & B_READ) 673 outb(DMA2_MODE, DMA37MD_SINGLE|DMA37MD_WRITE|(chan&3)); 674 else 675 outb(DMA2_MODE, DMA37MD_SINGLE|DMA37MD_READ|(chan&3)); 676 outb(DMA2_FFC, 0); 677 678 /* send start address */ 679 waport = DMA2_CHN(chan - 4); 680 outb(waport, phys>>1); 681 outb(waport, phys>>9); 682 outb(dmapageport[chan], phys>>16); 683 684 /* send count */ 685 nbytes >>= 1; 686 outb(waport + 2, --nbytes); 687 outb(waport + 2, nbytes>>8); 688 689 /* unmask channel */ 690 outb(DMA2_SMSK, chan & 3); 691 } 692} 693 694void isa_dmadone(int flags, caddr_t addr, int nbytes, int chan) 695{ 696 697 /* copy bounce buffer on read */ 698 /*if ((flags & (B_PHYS|B_READ)) == (B_PHYS|B_READ))*/ 699 if (bounced[chan]) { 700 bcopy(dma_bounce[chan], addr, nbytes); 701 bounced[chan] = 0; 702 } 703} 704 705/* 706 * Check for problems with the address range of a DMA transfer 707 * (non-contiguous physical pages, outside of bus address space, 708 * crossing DMA page boundaries). 709 * Return true if special handling needed. 710 */ 711 712static int 713isa_dmarangecheck(caddr_t va, unsigned length, unsigned chan) { 714 vm_offset_t phys, priorpage = 0, endva; 715 u_int dma_pgmsk = (chan & 4) ? ~(128*1024-1) : ~(64*1024-1); 716 717 endva = (vm_offset_t)round_page(va + length); 718 for (; va < (caddr_t) endva ; va += NBPG) { 719 phys = trunc_page(pmap_extract(pmap_kernel(), (vm_offset_t)va)); 720#define ISARAM_END RAM_END 721 if (phys == 0) 722 panic("isa_dmacheck: no physical page present"); 723 if (phys >= ISARAM_END) 724 return (1); 725 if (priorpage) { 726 if (priorpage + NBPG != phys) 727 return (1); 728 /* check if crossing a DMA page boundary */ 729 if (((u_int)priorpage ^ (u_int)phys) & dma_pgmsk) 730 return (1); 731 } 732 priorpage = phys; 733 } 734 return (0); 735} 736 737#define NMI_PARITY (1 << 7) 738#define NMI_IOCHAN (1 << 6) 739#define ENMI_WATCHDOG (1 << 7) 740#define ENMI_BUSTIMER (1 << 6) 741#define ENMI_IOSTATUS (1 << 5) 742 743/* 744 * Handle a NMI, possibly a machine check. 745 * return true to panic system, false to ignore. 746 */ 747int 748isa_nmi(cd) 749 int cd; 750{ 751 int isa_port = inb(0x61); 752 int eisa_port = inb(0x461); 753 if(isa_port & NMI_PARITY) { 754 panic("RAM parity error, likely hardware failure."); 755 } else if(isa_port & NMI_IOCHAN) { 756 panic("I/O channel check, likely hardware failure."); 757 } else if(eisa_port & ENMI_WATCHDOG) { 758 panic("EISA watchdog timer expired, likely hardware failure."); 759 } else if(eisa_port & ENMI_BUSTIMER) { 760 panic("EISA bus timeout, likely hardware failure."); 761 } else if(eisa_port & ENMI_IOSTATUS) { 762 panic("EISA I/O port status error."); 763 } else { 764 printf("\nNMI ISA %x, EISA %x\n", isa_port, eisa_port); 765 return(0); 766 } 767} 768 769/* 770 * Caught a stray interrupt, notify 771 */ 772static void 773isa_strayintr(d) 774 int d; 775{ 776 777 /* DON'T BOTHER FOR NOW! */ 778 /* for some reason, we get bursts of intr #7, even if not enabled! */ 779 /* 780 * Well the reason you got bursts of intr #7 is because someone 781 * raised an interrupt line and dropped it before the 8259 could 782 * prioritize it. This is documented in the intel data book. This 783 * means you have BAD hardware! I have changed this so that only 784 * the first 5 get logged, then it quits logging them, and puts 785 * out a special message. rgrimes 3/25/1993 786 */ 787 /* 788 * XXX TODO print a different message for #7 if it is for a 789 * glitch. Glitches can be distinguished from real #7's by 790 * testing that the in-service bit is _not_ set. The test 791 * must be done before sending an EOI so it can't be done if 792 * we are using AUTO_EOI_1. 793 */ 794 if (intrcnt[NR_DEVICES + d] <= 5) 795 log(LOG_ERR, "stray irq %d\n", d); 796 if (intrcnt[NR_DEVICES + d] == 5) 797 log(LOG_CRIT, 798 "too many stray irq %d's; not logging any more\n", d); 799} 800 801/* 802 * Find the highest priority enabled display device. Since we can't 803 * distinguish display devices from ttys, depend on display devices 804 * being sensitive and before sensitive non-display devices (if any) 805 * in isa_devtab_tty. 806 * 807 * XXX we should add capability flags IAMDISPLAY and ISUPPORTCONSOLES. 808 */ 809struct isa_device * 810find_display() 811{ 812 struct isa_device *dvp; 813 814 for (dvp = isa_devtab_tty; dvp->id_driver != NULL; dvp++) 815 if (dvp->id_driver->sensitive_hw && dvp->id_enabled) 816 return (dvp); 817 return (NULL); 818} 819 820/* 821 * find an ISA device in a given isa_devtab_* table, given 822 * the table to search, the expected id_driver entry, and the unit number. 823 * 824 * this function is defined in isa_device.h, and this location is debatable; 825 * i put it there because it's useless w/o, and directly operates on 826 * the other stuff in that file. 827 * 828 */ 829 830struct isa_device *find_isadev(table, driverp, unit) 831 struct isa_device *table; 832 struct isa_driver *driverp; 833 int unit; 834{ 835 if (driverp == NULL) /* sanity check */ 836 return NULL; 837 838 while ((table->id_driver != driverp) || (table->id_unit != unit)) { 839 if (table->id_driver == 0) 840 return NULL; 841 842 table++; 843 } 844 845 return table; 846} 847 848/* 849 * Return nonzero if a (masked) irq is pending for a given device. 850 */ 851int 852isa_irq_pending(dvp) 853 struct isa_device *dvp; 854{ 855 unsigned id_irq; 856 857 id_irq = dvp->id_irq; 858 if (id_irq & 0xff) 859 return (inb(IO_ICU1) & id_irq); 860 return (inb(IO_ICU2) & (id_irq >> 8)); 861} 862 863int 864update_intr_masks(void) 865{ 866 int intr, n=0; 867 u_int mask,*maskptr; 868 869 for (intr=0; intr < ICU_LEN; intr ++) { 870 if (intr==2) continue; 871 maskptr = intr_mptr[intr]; 872 if (!maskptr) continue; 873 *maskptr |= 1 << intr; 874 mask = *maskptr; 875 if (mask != intr_mask[intr]) { 876#if 0 877 printf ("intr_mask[%2d] old=%08x new=%08x ptr=%p.\n", 878 intr, intr_mask[intr], mask, maskptr); 879#endif 880 intr_mask[intr]=mask; 881 n++; 882 } 883 884 } 885 return (n); 886} 887 888int 889register_intr(intr, device_id, flags, handler, maskptr, unit) 890 int intr; 891 int device_id; 892 u_int flags; 893 inthand2_t *handler; 894 u_int *maskptr; 895 int unit; 896{ 897 char *cp; 898 u_long ef; 899 int id; 900 u_int mask = (maskptr ? *maskptr : 0); 901 902 if ((u_int)intr >= ICU_LEN || intr == 2 903 || (u_int)device_id >= NR_DEVICES) 904 return (EINVAL); 905 if (intr_handler[intr] != isa_strayintr) 906 return (EBUSY); 907 ef = read_eflags(); 908 disable_intr(); 909 intr_countp[intr] = &intrcnt[device_id]; 910 intr_handler[intr] = handler; 911 intr_mptr[intr] = maskptr; 912 intr_mask[intr] = mask | (1 << intr); 913 intr_unit[intr] = unit; 914 setidt(ICU_OFFSET + intr, 915 flags & RI_FAST ? fastintr[intr] : slowintr[intr], 916 SDT_SYS386IGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 917 write_eflags(ef); 918 for (cp = intrnames, id = 0; id <= device_id; id++) 919 while (*cp++ != '\0') 920 ; 921 if (cp > eintrnames) 922 return (0); 923 if (intr < 10) { 924 cp[-3] = intr + '0'; 925 cp[-2] = ' '; 926 } else { 927 cp[-3] = '1'; 928 cp[-2] = intr - 10 + '0'; 929 } 930 return (0); 931} 932 933static void 934register_imask(dvp, mask) 935 struct isa_device *dvp; 936 u_int mask; 937{ 938 if (dvp->id_alive && dvp->id_irq) { 939 int intr; 940 941 intr = ffs(dvp->id_irq) - 1; 942 intr_mask[intr] = mask | (1 <<intr); 943 } 944 (void) update_intr_masks(); 945} 946 947int 948unregister_intr(intr, handler) 949 int intr; 950 inthand2_t *handler; 951{ 952 u_long ef; 953 954 if ((u_int)intr >= ICU_LEN || handler != intr_handler[intr]) 955 return (EINVAL); 956 ef = read_eflags(); 957 disable_intr(); 958 intr_countp[intr] = &intrcnt[NR_DEVICES + intr]; 959 intr_handler[intr] = isa_strayintr; 960 intr_mptr[intr] = NULL; 961 intr_mask[intr] = HWI_MASK | SWI_MASK; 962 intr_unit[intr] = intr; 963 setidt(ICU_OFFSET + intr, slowintr[intr], SDT_SYS386IGT, SEL_KPL, 964 GSEL(GCODE_SEL, SEL_KPL)); 965 write_eflags(ef); 966 return (0); 967} 968