Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/amd64/isa/isa_dma.c
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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 * 4. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 * from: @(#)isa.c 7.2 (Berkeley) 5/13/91 33 */ 34 35 #include <sys/cdefs.h> 36 __FBSDID("$FreeBSD: releng/8.0/sys/amd64/isa/isa_dma.c 146214 2005-05-14 10:14:56Z nyan $"); 37 38 /* 39 * code to manage AT bus 40 * 41 * 92/08/18 Frank P. MacLachlan (fpm@crash.cts.com): 42 * Fixed uninitialized variable problem and added code to deal 43 * with DMA page boundaries in isa_dmarangecheck(). Fixed word 44 * mode DMA count compution and reorganized DMA setup code in 45 * isa_dmastart() 46 */ 47 48 #include <sys/param.h> 49 #include <sys/systm.h> 50 #include <sys/bus.h> 51 #include <sys/kernel.h> 52 #include <sys/malloc.h> 53 #include <sys/lock.h> 54 #include <sys/proc.h> 55 #include <sys/mutex.h> 56 #include <sys/module.h> 57 #include <vm/vm.h> 58 #include <vm/vm_param.h> 59 #include <vm/pmap.h> 60 #include <isa/isareg.h> 61 #include <isa/isavar.h> 62 #include <isa/isa_dmareg.h> 63 64 #define ISARAM_END 0x1000000 65 66 static int isa_dmarangecheck(caddr_t va, u_int length, int chan); 67 68 static caddr_t dma_bouncebuf[8]; 69 static u_int dma_bouncebufsize[8]; 70 static u_int8_t dma_bounced = 0; 71 static u_int8_t dma_busy = 0; /* Used in isa_dmastart() */ 72 static u_int8_t dma_inuse = 0; /* User for acquire/release */ 73 static u_int8_t dma_auto_mode = 0; 74 75 #define VALID_DMA_MASK (7) 76 77 /* high byte of address is stored in this port for i-th dma channel */ 78 static int dmapageport[8] = { 0x87, 0x83, 0x81, 0x82, 0x8f, 0x8b, 0x89, 0x8a }; 79 80 /* 81 * Setup a DMA channel's bounce buffer. 82 */ 83 int 84 isa_dma_init(int chan, u_int bouncebufsize, int flag) 85 { 86 void *buf; 87 88 /* 89 * If a DMA channel is shared, both drivers have to call isa_dma_init 90 * since they don't know that the other driver will do it. 91 * Just return if we're already set up good. 92 * XXX: this only works if they agree on the bouncebuf size. This 93 * XXX: is typically the case since they are multiple instances of 94 * XXX: the same driver. 95 */ 96 if (dma_bouncebuf[chan] != NULL) 97 return (0); 98 99 #ifdef DIAGNOSTIC 100 if (chan & ~VALID_DMA_MASK) 101 panic("isa_dma_init: channel out of range"); 102 #endif 103 104 dma_bouncebufsize[chan] = bouncebufsize; 105 106 /* Try malloc() first. It works better if it works. */ 107 buf = malloc(bouncebufsize, M_DEVBUF, flag); 108 if (buf != NULL) { 109 if (isa_dmarangecheck(buf, bouncebufsize, chan) == 0) { 110 dma_bouncebuf[chan] = buf; 111 return (0); 112 } 113 free(buf, M_DEVBUF); 114 } 115 buf = contigmalloc(bouncebufsize, M_DEVBUF, flag, 0ul, 0xfffffful, 116 1ul, chan & 4 ? 0x20000ul : 0x10000ul); 117 if (buf == NULL) 118 return (ENOMEM); 119 dma_bouncebuf[chan] = buf; 120 return (0); 121 } 122 123 /* 124 * Register a DMA channel's usage. Usually called from a device driver 125 * in open() or during its initialization. 126 */ 127 int 128 isa_dma_acquire(chan) 129 int chan; 130 { 131 #ifdef DIAGNOSTIC 132 if (chan & ~VALID_DMA_MASK) 133 panic("isa_dma_acquire: channel out of range"); 134 #endif 135 136 if (dma_inuse & (1 << chan)) { 137 printf("isa_dma_acquire: channel %d already in use\n", chan); 138 return (EBUSY); 139 } 140 dma_inuse |= (1 << chan); 141 dma_auto_mode &= ~(1 << chan); 142 143 return (0); 144 } 145 146 /* 147 * Unregister a DMA channel's usage. Usually called from a device driver 148 * during close() or during its shutdown. 149 */ 150 void 151 isa_dma_release(chan) 152 int chan; 153 { 154 #ifdef DIAGNOSTIC 155 if (chan & ~VALID_DMA_MASK) 156 panic("isa_dma_release: channel out of range"); 157 158 if ((dma_inuse & (1 << chan)) == 0) 159 printf("isa_dma_release: channel %d not in use\n", chan); 160 #endif 161 162 if (dma_busy & (1 << chan)) { 163 dma_busy &= ~(1 << chan); 164 /* 165 * XXX We should also do "dma_bounced &= (1 << chan);" 166 * because we are acting on behalf of isa_dmadone() which 167 * was not called to end the last DMA operation. This does 168 * not matter now, but it may in the future. 169 */ 170 } 171 172 dma_inuse &= ~(1 << chan); 173 dma_auto_mode &= ~(1 << chan); 174 } 175 176 /* 177 * isa_dmacascade(): program 8237 DMA controller channel to accept 178 * external dma control by a board. 179 */ 180 void 181 isa_dmacascade(chan) 182 int chan; 183 { 184 #ifdef DIAGNOSTIC 185 if (chan & ~VALID_DMA_MASK) 186 panic("isa_dmacascade: channel out of range"); 187 #endif 188 189 /* set dma channel mode, and set dma channel mode */ 190 if ((chan & 4) == 0) { 191 outb(DMA1_MODE, DMA37MD_CASCADE | chan); 192 outb(DMA1_SMSK, chan); 193 } else { 194 outb(DMA2_MODE, DMA37MD_CASCADE | (chan & 3)); 195 outb(DMA2_SMSK, chan & 3); 196 } 197 } 198 199 /* 200 * isa_dmastart(): program 8237 DMA controller channel, avoid page alignment 201 * problems by using a bounce buffer. 202 */ 203 void 204 isa_dmastart(int flags, caddr_t addr, u_int nbytes, int chan) 205 { 206 vm_paddr_t phys; 207 int waport; 208 caddr_t newaddr; 209 210 GIANT_REQUIRED; 211 212 #ifdef DIAGNOSTIC 213 if (chan & ~VALID_DMA_MASK) 214 panic("isa_dmastart: channel out of range"); 215 216 if ((chan < 4 && nbytes > (1<<16)) 217 || (chan >= 4 && (nbytes > (1<<17) || (uintptr_t)addr & 1))) 218 panic("isa_dmastart: impossible request"); 219 220 if ((dma_inuse & (1 << chan)) == 0) 221 printf("isa_dmastart: channel %d not acquired\n", chan); 222 #endif 223 224 #if 0 225 /* 226 * XXX This should be checked, but drivers like ad1848 only call 227 * isa_dmastart() once because they use Auto DMA mode. If we 228 * leave this in, drivers that do this will print this continuously. 229 */ 230 if (dma_busy & (1 << chan)) 231 printf("isa_dmastart: channel %d busy\n", chan); 232 #endif 233 234 dma_busy |= (1 << chan); 235 236 if (isa_dmarangecheck(addr, nbytes, chan)) { 237 if (dma_bouncebuf[chan] == NULL 238 || dma_bouncebufsize[chan] < nbytes) 239 panic("isa_dmastart: bad bounce buffer"); 240 dma_bounced |= (1 << chan); 241 newaddr = dma_bouncebuf[chan]; 242 243 /* copy bounce buffer on write */ 244 if (!(flags & ISADMA_READ)) 245 bcopy(addr, newaddr, nbytes); 246 addr = newaddr; 247 } 248 249 /* translate to physical */ 250 phys = pmap_extract(kernel_pmap, (vm_offset_t)addr); 251 252 if (flags & ISADMA_RAW) { 253 dma_auto_mode |= (1 << chan); 254 } else { 255 dma_auto_mode &= ~(1 << chan); 256 } 257 258 if ((chan & 4) == 0) { 259 /* 260 * Program one of DMA channels 0..3. These are 261 * byte mode channels. 262 */ 263 /* set dma channel mode, and reset address ff */ 264 265 /* If ISADMA_RAW flag is set, then use autoinitialise mode */ 266 if (flags & ISADMA_RAW) { 267 if (flags & ISADMA_READ) 268 outb(DMA1_MODE, DMA37MD_AUTO|DMA37MD_WRITE|chan); 269 else 270 outb(DMA1_MODE, DMA37MD_AUTO|DMA37MD_READ|chan); 271 } 272 else 273 if (flags & ISADMA_READ) 274 outb(DMA1_MODE, DMA37MD_SINGLE|DMA37MD_WRITE|chan); 275 else 276 outb(DMA1_MODE, DMA37MD_SINGLE|DMA37MD_READ|chan); 277 outb(DMA1_FFC, 0); 278 279 /* send start address */ 280 waport = DMA1_CHN(chan); 281 outb(waport, phys); 282 outb(waport, phys>>8); 283 outb(dmapageport[chan], phys>>16); 284 285 /* send count */ 286 outb(waport + 1, --nbytes); 287 outb(waport + 1, nbytes>>8); 288 289 /* unmask channel */ 290 outb(DMA1_SMSK, chan); 291 } else { 292 /* 293 * Program one of DMA channels 4..7. These are 294 * word mode channels. 295 */ 296 /* set dma channel mode, and reset address ff */ 297 298 /* If ISADMA_RAW flag is set, then use autoinitialise mode */ 299 if (flags & ISADMA_RAW) { 300 if (flags & ISADMA_READ) 301 outb(DMA2_MODE, DMA37MD_AUTO|DMA37MD_WRITE|(chan&3)); 302 else 303 outb(DMA2_MODE, DMA37MD_AUTO|DMA37MD_READ|(chan&3)); 304 } 305 else 306 if (flags & ISADMA_READ) 307 outb(DMA2_MODE, DMA37MD_SINGLE|DMA37MD_WRITE|(chan&3)); 308 else 309 outb(DMA2_MODE, DMA37MD_SINGLE|DMA37MD_READ|(chan&3)); 310 outb(DMA2_FFC, 0); 311 312 /* send start address */ 313 waport = DMA2_CHN(chan - 4); 314 outb(waport, phys>>1); 315 outb(waport, phys>>9); 316 outb(dmapageport[chan], phys>>16); 317 318 /* send count */ 319 nbytes >>= 1; 320 outb(waport + 2, --nbytes); 321 outb(waport + 2, nbytes>>8); 322 323 /* unmask channel */ 324 outb(DMA2_SMSK, chan & 3); 325 } 326 } 327 328 void 329 isa_dmadone(int flags, caddr_t addr, int nbytes, int chan) 330 { 331 #ifdef DIAGNOSTIC 332 if (chan & ~VALID_DMA_MASK) 333 panic("isa_dmadone: channel out of range"); 334 335 if ((dma_inuse & (1 << chan)) == 0) 336 printf("isa_dmadone: channel %d not acquired\n", chan); 337 #endif 338 339 if (((dma_busy & (1 << chan)) == 0) && 340 (dma_auto_mode & (1 << chan)) == 0 ) 341 printf("isa_dmadone: channel %d not busy\n", chan); 342 343 if ((dma_auto_mode & (1 << chan)) == 0) 344 outb(chan & 4 ? DMA2_SMSK : DMA1_SMSK, (chan & 3) | 4); 345 346 if (dma_bounced & (1 << chan)) { 347 /* copy bounce buffer on read */ 348 if (flags & ISADMA_READ) 349 bcopy(dma_bouncebuf[chan], addr, nbytes); 350 351 dma_bounced &= ~(1 << chan); 352 } 353 dma_busy &= ~(1 << chan); 354 } 355 356 /* 357 * Check for problems with the address range of a DMA transfer 358 * (non-contiguous physical pages, outside of bus address space, 359 * crossing DMA page boundaries). 360 * Return true if special handling needed. 361 */ 362 363 static int 364 isa_dmarangecheck(caddr_t va, u_int length, int chan) 365 { 366 vm_paddr_t phys, priorpage = 0; 367 vm_offset_t endva; 368 u_int dma_pgmsk = (chan & 4) ? ~(128*1024-1) : ~(64*1024-1); 369 370 GIANT_REQUIRED; 371 372 endva = (vm_offset_t)round_page((vm_offset_t)va + length); 373 for (; va < (caddr_t) endva ; va += PAGE_SIZE) { 374 phys = trunc_page(pmap_extract(kernel_pmap, (vm_offset_t)va)); 375 if (phys == 0) 376 panic("isa_dmacheck: no physical page present"); 377 if (phys >= ISARAM_END) 378 return (1); 379 if (priorpage) { 380 if (priorpage + PAGE_SIZE != phys) 381 return (1); 382 /* check if crossing a DMA page boundary */ 383 if (((u_int)priorpage ^ (u_int)phys) & dma_pgmsk) 384 return (1); 385 } 386 priorpage = phys; 387 } 388 return (0); 389 } 390 391 /* 392 * Query the progress of a transfer on a DMA channel. 393 * 394 * To avoid having to interrupt a transfer in progress, we sample 395 * each of the high and low databytes twice, and apply the following 396 * logic to determine the correct count. 397 * 398 * Reads are performed with interrupts disabled, thus it is to be 399 * expected that the time between reads is very small. At most 400 * one rollover in the low count byte can be expected within the 401 * four reads that are performed. 402 * 403 * There are three gaps in which a rollover can occur : 404 * 405 * - read low1 406 * gap1 407 * - read high1 408 * gap2 409 * - read low2 410 * gap3 411 * - read high2 412 * 413 * If a rollover occurs in gap1 or gap2, the low2 value will be 414 * greater than the low1 value. In this case, low2 and high2 are a 415 * corresponding pair. 416 * 417 * In any other case, low1 and high1 can be considered to be correct. 418 * 419 * The function returns the number of bytes remaining in the transfer, 420 * or -1 if the channel requested is not active. 421 * 422 */ 423 int 424 isa_dmastatus(int chan) 425 { 426 u_long cnt = 0; 427 int ffport, waport; 428 u_long low1, high1, low2, high2; 429 430 /* channel active? */ 431 if ((dma_inuse & (1 << chan)) == 0) { 432 printf("isa_dmastatus: channel %d not active\n", chan); 433 return(-1); 434 } 435 /* channel busy? */ 436 437 if (((dma_busy & (1 << chan)) == 0) && 438 (dma_auto_mode & (1 << chan)) == 0 ) { 439 printf("chan %d not busy\n", chan); 440 return -2 ; 441 } 442 if (chan < 4) { /* low DMA controller */ 443 ffport = DMA1_FFC; 444 waport = DMA1_CHN(chan) + 1; 445 } else { /* high DMA controller */ 446 ffport = DMA2_FFC; 447 waport = DMA2_CHN(chan - 4) + 2; 448 } 449 450 disable_intr(); /* no interrupts Mr Jones! */ 451 outb(ffport, 0); /* clear register LSB flipflop */ 452 low1 = inb(waport); 453 high1 = inb(waport); 454 outb(ffport, 0); /* clear again */ 455 low2 = inb(waport); 456 high2 = inb(waport); 457 enable_intr(); /* enable interrupts again */ 458 459 /* 460 * Now decide if a wrap has tried to skew our results. 461 * Note that after TC, the count will read 0xffff, while we want 462 * to return zero, so we add and then mask to compensate. 463 */ 464 if (low1 >= low2) { 465 cnt = (low1 + (high1 << 8) + 1) & 0xffff; 466 } else { 467 cnt = (low2 + (high2 << 8) + 1) & 0xffff; 468 } 469 470 if (chan >= 4) /* high channels move words */ 471 cnt *= 2; 472 return(cnt); 473 } 474 475 /* 476 * Reached terminal count yet ? 477 */ 478 int 479 isa_dmatc(int chan) 480 { 481 482 if (chan < 4) 483 return(inb(DMA1_STATUS) & (1 << chan)); 484 else 485 return(inb(DMA2_STATUS) & (1 << (chan & 3))); 486 } 487 488 /* 489 * Stop a DMA transfer currently in progress. 490 */ 491 int 492 isa_dmastop(int chan) 493 { 494 if ((dma_inuse & (1 << chan)) == 0) 495 printf("isa_dmastop: channel %d not acquired\n", chan); 496 497 if (((dma_busy & (1 << chan)) == 0) && 498 ((dma_auto_mode & (1 << chan)) == 0)) { 499 printf("chan %d not busy\n", chan); 500 return -2 ; 501 } 502 503 if ((chan & 4) == 0) { 504 outb(DMA1_SMSK, (chan & 3) | 4 /* disable mask */); 505 } else { 506 outb(DMA2_SMSK, (chan & 3) | 4 /* disable mask */); 507 } 508 return(isa_dmastatus(chan)); 509 } 510 511 /* 512 * Attach to the ISA PnP descriptor for the AT DMA controller 513 */ 514 static struct isa_pnp_id atdma_ids[] = { 515 { 0x0002d041 /* PNP0200 */, "AT DMA controller" }, 516 { 0 } 517 }; 518 519 static int 520 atdma_probe(device_t dev) 521 { 522 int result; 523 524 if ((result = ISA_PNP_PROBE(device_get_parent(dev), dev, atdma_ids)) <= 0) 525 device_quiet(dev); 526 return(result); 527 } 528 529 static int 530 atdma_attach(device_t dev) 531 { 532 return(0); 533 } 534 535 static device_method_t atdma_methods[] = { 536 /* Device interface */ 537 DEVMETHOD(device_probe, atdma_probe), 538 DEVMETHOD(device_attach, atdma_attach), 539 DEVMETHOD(device_detach, bus_generic_detach), 540 DEVMETHOD(device_shutdown, bus_generic_shutdown), 541 DEVMETHOD(device_suspend, bus_generic_suspend), 542 DEVMETHOD(device_resume, bus_generic_resume), 543 { 0, 0 } 544 }; 545 546 static driver_t atdma_driver = { 547 "atdma", 548 atdma_methods, 549 1, /* no softc */ 550 }; 551 552 static devclass_t atdma_devclass; 553 554 DRIVER_MODULE(atdma, isa, atdma_driver, atdma_devclass, 0, 0); 555 DRIVER_MODULE(atdma, acpi, atdma_driver, atdma_devclass, 0, 0);
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