flash.c revision 1.1.4.4
1 /* $NetBSD: flash.c,v 1.1.4.4 2011/05/31 03:04:36 rmind Exp $ */ 2 3 /*- 4 * Copyright (c) 2011 Department of Software Engineering, 5 * University of Szeged, Hungary 6 * Copyright (c) 2011 Adam Hoka <ahoka (at) NetBSD.org> 7 * Copyright (c) 2010 David Tengeri <dtengeri (at) inf.u-szeged.hu> 8 * All rights reserved. 9 * 10 * This code is derived from software contributed to The NetBSD Foundation 11 * by the Department of Software Engineering, University of Szeged, Hungary 12 * 13 * Redistribution and use in source and binary forms, with or without 14 * modification, are permitted provided that the following conditions 15 * are met: 16 * 1. Redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer. 18 * 2. Redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions and the following disclaimer in the 20 * documentation and/or other materials provided with the distribution. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 24 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 25 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 26 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 27 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 28 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 29 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 30 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35 /*- 36 * Framework for storage devices based on Flash technology 37 */ 38 39 #include <sys/cdefs.h> 40 __KERNEL_RCSID(0, "$NetBSD: flash.c,v 1.1.4.4 2011/05/31 03:04:36 rmind Exp $"); 41 42 #include <sys/param.h> 43 #include <sys/types.h> 44 #include <sys/proc.h> 45 #include <sys/errno.h> 46 #include <sys/ioctl.h> 47 #include <sys/device.h> 48 #include <sys/conf.h> 49 #include <sys/kmem.h> 50 #include <sys/uio.h> 51 #include <sys/kernel.h> 52 53 #include <sys/atomic.h> 54 #include <sys/buf.h> 55 #include <sys/bufq.h> 56 #include <sys/disk.h> 57 #include <sys/disklabel.h> 58 #include <sys/malloc.h> 59 #include <sys/reboot.h> 60 61 #include <sys/flashio.h> 62 #include "flash.h" 63 64 #define FLASH_DEBUG 1 65 #ifdef FLASH_DEBUG 66 #define DPRINTF(x) if (flashdebug) printf x 67 #define DPRINTFN(n,x) if (flashdebug>(n)) printf x 68 int flashdebug = FLASH_DEBUG; 69 #else 70 #define DPRINTF(x) 71 #define DPRINTFN(n,x) 72 #endif 73 74 extern struct cfdriver flash_cd; 75 76 dev_type_open(flashopen); 77 dev_type_close(flashclose); 78 dev_type_read(flashread); 79 dev_type_write(flashwrite); 80 dev_type_ioctl(flashioctl); 81 dev_type_strategy(flashstrategy); 82 dev_type_dump(flashdump); 83 dev_type_size(flashsize); 84 85 int flash_print(void *aux, const char *pnp); 86 87 bool flash_shutdown(device_t dev, int how); 88 int flash_nsectors(struct buf *bp); 89 int flash_sector(struct buf *bp); 90 91 static inline flash_off_t flash_get_part_offset(struct flash_softc *fl, 92 size_t poffset); 93 94 int flash_match(device_t parent, cfdata_t match, void *aux); 95 void flash_attach(device_t parent, device_t self, void *aux); 96 int flash_detach(device_t device, int flags); 97 98 CFATTACH_DECL_NEW(flash, sizeof(struct flash_softc), 99 flash_match, flash_attach, flash_detach, NULL); 100 101 /** 102 * Block device's operation 103 */ 104 const struct bdevsw flash_bdevsw = { 105 .d_open = flashopen, 106 .d_close = flashclose, 107 .d_strategy = flashstrategy, 108 .d_ioctl = flashioctl, 109 .d_dump = flashdump, 110 .d_psize = flashsize, 111 .d_flag = D_DISK | D_MPSAFE 112 }; 113 114 /** 115 * Character device's operations 116 */ 117 const struct cdevsw flash_cdevsw = { 118 .d_open = flashopen, 119 .d_close = flashclose, 120 .d_read = flashread, 121 .d_write = flashwrite, 122 .d_ioctl = flashioctl, 123 .d_stop = nostop, 124 .d_tty = notty, 125 .d_poll = nopoll, 126 .d_mmap = nommap, 127 .d_kqfilter = nokqfilter, 128 .d_flag = D_DISK | D_MPSAFE 129 }; 130 131 /* ARGSUSED */ 132 int 133 flash_match(device_t parent, cfdata_t match, void *aux) 134 { 135 /* pseudo device, always attaches */ 136 return 1; 137 } 138 139 /* ARGSUSED */ 140 void 141 flash_attach(device_t parent, device_t self, void *aux) 142 { 143 struct flash_softc *sc = device_private(self); 144 struct flash_attach_args *faa = aux; 145 char pbuf[2][sizeof("9999 KB")]; 146 147 sc->sc_dev = self; 148 sc->sc_parent_dev = parent; 149 sc->flash_if = faa->flash_if; 150 sc->hw_softc = device_private(parent); 151 152 format_bytes(pbuf[0], sizeof(pbuf[0]), sc->flash_if->size); 153 format_bytes(pbuf[1], sizeof(pbuf[1]), sc->flash_if->erasesize); 154 155 aprint_naive("\n"); 156 157 switch (sc->flash_if->type) { 158 case FLASH_TYPE_NOR: 159 aprint_normal(": %s NOR flash\n", pbuf[0]); 160 break; 161 162 case FLASH_TYPE_NAND: 163 aprint_normal(": %s NAND flash\n", pbuf[0]); 164 break; 165 166 default: 167 aprint_normal(": %s unknown flash\n", pbuf[0]); 168 } 169 170 aprint_normal_dev(sc->sc_dev, 171 "size: 0x%jx, offset: 0x%jx", 172 (uintmax_t )sc->flash_if->partition.part_size, 173 (uintmax_t )sc->flash_if->partition.part_offset); 174 175 if (sc->flash_if->partition.part_flags & FLASH_PART_READONLY) { 176 sc->sc_readonly = true; 177 aprint_normal(", read only"); 178 } else { 179 sc->sc_readonly = false; 180 } 181 182 aprint_normal("\n"); 183 184 if (sc->flash_if->partition.part_size == 0) { 185 aprint_error_dev(self, 186 "partition size must be larger than 0\n"); 187 return; 188 } 189 190 switch (sc->flash_if->type) { 191 case FLASH_TYPE_NOR: 192 aprint_normal_dev(sc->sc_dev, 193 "erase size %s bytes, write size %d bytes\n", 194 pbuf[1], sc->flash_if->writesize); 195 break; 196 197 case FLASH_TYPE_NAND: 198 default: 199 aprint_normal_dev(sc->sc_dev, 200 "erase size %s, page size %d bytes, write size %d bytes\n", 201 pbuf[1], sc->flash_if->page_size, 202 sc->flash_if->writesize); 203 break; 204 } 205 206 if (!pmf_device_register1(sc->sc_dev, NULL, NULL, flash_shutdown)) 207 aprint_error_dev(sc->sc_dev, 208 "couldn't establish power handler\n"); 209 } 210 211 int 212 flash_detach(device_t device, int flags) 213 { 214 struct flash_softc *sc = device_private(device); 215 216 pmf_device_deregister(sc->sc_dev); 217 218 /* freeing flash_if is our responsibility */ 219 kmem_free(sc->flash_if, sizeof(*sc->flash_if)); 220 221 return 0; 222 } 223 224 int 225 flash_print(void *aux, const char *pnp) 226 { 227 struct flash_attach_args *arg; 228 const char *type; 229 230 if (pnp != NULL) { 231 arg = aux; 232 switch (arg->flash_if->type) { 233 case FLASH_TYPE_NOR: 234 type = "NOR"; 235 break; 236 case FLASH_TYPE_NAND: 237 type = "NAND"; 238 break; 239 default: 240 panic("flash_print: unknown type %d", 241 arg->flash_if->type); 242 } 243 aprint_normal("%s flash at %s", type, pnp); 244 } 245 return UNCONF; 246 } 247 248 device_t 249 flash_attach_mi(struct flash_interface *flash_if, device_t device) 250 { 251 struct flash_attach_args arg; 252 253 #ifdef DIAGNOSTIC 254 if (flash_if == NULL) { 255 aprint_error("flash_attach_mi: NULL\n"); 256 return 0; 257 } 258 #endif 259 arg.flash_if = flash_if; 260 261 return config_found_ia(device, "flashbus", &arg, flash_print); 262 } 263 264 /** 265 * flash_open - open the character device 266 * Checks if there is a driver registered to the minor number of the open 267 * request. 268 */ 269 int 270 flashopen(dev_t dev, int flags, int fmt, struct lwp *l) 271 { 272 int unit = minor(dev); 273 struct flash_softc *sc; 274 275 DPRINTFN(1, ("flash: opening device unit %d\n", unit)); 276 277 if ((sc = device_lookup_private(&flash_cd, unit)) == NULL) 278 return ENXIO; 279 280 /* TODO return eperm if want to open for writing a read only dev */ 281 282 /* reset buffer length */ 283 // sc->sc_cache->fc_len = 0; 284 285 return 0; 286 } 287 288 /** 289 * flash_close - close device 290 * We don't have to release any resources, so just return 0. 291 */ 292 int 293 flashclose(dev_t dev, int flags, int fmt, struct lwp *l) 294 { 295 int unit = minor(dev); 296 struct flash_softc *sc; 297 int err; 298 299 DPRINTFN(1, ("flash: closing flash device unit %d\n", unit)); 300 301 if ((sc = device_lookup_private(&flash_cd, unit)) == NULL) 302 return ENXIO; 303 304 if (!sc->sc_readonly) { 305 err = flash_sync(sc->sc_dev); 306 if (err) 307 return err; 308 } 309 310 return 0; 311 } 312 313 /** 314 * flash_read - read from character device 315 * This function uses the registered driver's read function to read the requested length to 316 * a buffer and then moves this buffer to userspace. 317 */ 318 int 319 flashread(dev_t dev, struct uio *uio, int flag) 320 { 321 return physio(flashstrategy, NULL, dev, B_READ, minphys, uio); 322 } 323 324 /** 325 * flash_write - write to character device 326 * This function moves the data into a buffer from userspace to kernel space, 327 * then uses the registered driver's write function to write out the data to 328 * the media. 329 */ 330 int 331 flashwrite(dev_t dev, struct uio *uio, int flag) 332 { 333 return physio(flashstrategy, NULL, dev, B_WRITE, minphys, uio); 334 } 335 336 void 337 flashstrategy(struct buf *bp) 338 { 339 struct flash_softc *sc; 340 const struct flash_interface *flash_if; 341 const struct flash_partition *part; 342 int unit, device_blks; 343 344 unit = minor(bp->b_dev); 345 sc = device_lookup_private(&flash_cd, unit); 346 if (sc == NULL) { 347 bp->b_error = ENXIO; 348 goto done; 349 } 350 351 flash_if = sc->flash_if; 352 part = &flash_if->partition; 353 354 /* divider */ 355 KASSERT(flash_if->writesize != 0); 356 357 aprint_debug_dev(sc->sc_dev, "flash_strategy()\n"); 358 359 if (!(bp->b_flags & B_READ) && sc->sc_readonly) { 360 bp->b_error = EACCES; 361 goto done; 362 } 363 364 /* check if length is not negative */ 365 if (bp->b_blkno < 0) { 366 bp->b_error = EINVAL; 367 goto done; 368 } 369 370 /* zero lenght i/o */ 371 if (bp->b_bcount == 0) { 372 goto done; 373 } 374 375 device_blks = sc->flash_if->size / DEV_BSIZE; 376 KASSERT(part->part_offset % DEV_BSIZE == 0); 377 bp->b_rawblkno = bp->b_blkno + (part->part_offset / DEV_BSIZE); 378 379 if (bounds_check_with_mediasize(bp, DEV_BSIZE, device_blks) <= 0) { 380 goto done; 381 } 382 383 bp->b_resid = bp->b_bcount; 384 flash_if->submit(sc->sc_parent_dev, bp); 385 386 return; 387 done: 388 bp->b_resid = bp->b_bcount; 389 biodone(bp); 390 } 391 392 /* 393 * Handle the ioctl for the device 394 */ 395 int 396 flashioctl(dev_t dev, u_long command, void *data, int flags, struct lwp *l) 397 { 398 struct flash_erase_params *ep; 399 struct flash_info_params *ip; 400 struct flash_dump_params *dp; 401 struct flash_badblock_params *bbp; 402 struct flash_erase_instruction ei; 403 struct flash_softc *sc; 404 int unit, err; 405 size_t retlen; 406 flash_off_t offset; 407 bool bad; 408 409 unit = minor(dev); 410 if ((sc = device_lookup_private(&flash_cd, unit)) == NULL) 411 return ENXIO; 412 413 err = 0; 414 switch (command) { 415 case FLASH_ERASE_BLOCK: 416 /** 417 * Set up an erase instruction then call the registered 418 * driver's erase operation. 419 */ 420 ep = data; 421 422 if (sc->sc_readonly) { 423 return EACCES; 424 } 425 426 ei.ei_addr = ep->ep_addr; 427 ei.ei_len = ep->ep_len; 428 ei.ei_callback = NULL; 429 430 err = flash_erase(sc->sc_dev, &ei); 431 if (err) { 432 return err; 433 } 434 435 break; 436 case FLASH_BLOCK_ISBAD: 437 /** 438 * Set up an erase instruction then call the registered 439 * driver's erase operation. 440 */ 441 bbp = data; 442 443 err = flash_block_isbad(sc->sc_dev, bbp->bbp_addr, &bad); 444 if (err) { 445 return err; 446 } 447 bbp->bbp_isbad = bad; 448 449 break; 450 case FLASH_BLOCK_MARKBAD: 451 bbp = data; 452 453 err = flash_block_markbad(sc->sc_dev, bbp->bbp_addr); 454 455 break; 456 case FLASH_DUMP: 457 dp = data; 458 offset = dp->dp_block * sc->flash_if->erasesize; 459 DPRINTF(("Reading from block: %jd len: %jd\n", 460 (intmax_t )dp->dp_block, (intmax_t )dp->dp_len)); 461 err = flash_read(sc->sc_parent_dev, offset, dp->dp_len, 462 &retlen, dp->dp_buf); 463 if (err) 464 return err; 465 if (retlen != dp->dp_len) { 466 dp->dp_len = -1; 467 dp->dp_buf = NULL; 468 } 469 470 break; 471 case FLASH_GET_INFO: 472 ip = data; 473 474 ip->ip_page_size = sc->flash_if->page_size; 475 ip->ip_erase_size = sc->flash_if->erasesize; 476 ip->ip_flash_type = sc->flash_if->type; 477 ip->ip_flash_size = sc->flash_if->size; 478 break; 479 default: 480 err = ENODEV; 481 } 482 483 return err; 484 } 485 486 int 487 flashsize(dev_t dev) 488 { 489 return -1; 490 } 491 492 int 493 flashdump(dev_t dev, daddr_t blkno, void *va, size_t size) 494 { 495 return EACCES; 496 } 497 498 bool 499 flash_shutdown(device_t self, int how) 500 { 501 struct flash_softc *sc = device_private(self); 502 503 if ((how & RB_NOSYNC) == 0 && !sc->sc_readonly) 504 flash_sync(self); 505 506 return true; 507 } 508 509 const struct flash_interface * 510 flash_get_interface(dev_t dev) 511 { 512 struct flash_softc *sc; 513 int unit; 514 515 unit = minor(dev); 516 if ((sc = device_lookup_private(&flash_cd, unit)) == NULL) 517 return NULL; 518 519 return sc->flash_if; 520 } 521 522 const struct flash_softc * 523 flash_get_softc(dev_t dev) 524 { 525 struct flash_softc *sc; 526 int unit; 527 528 unit = minor(dev); 529 sc = device_lookup_private(&flash_cd, unit); 530 531 return sc; 532 } 533 534 device_t 535 flash_get_device(dev_t dev) 536 { 537 struct flash_softc *sc; 538 int unit; 539 540 unit = minor(dev); 541 sc = device_lookup_private(&flash_cd, unit); 542 543 return sc->sc_dev; 544 } 545 546 static inline flash_off_t 547 flash_get_part_offset(struct flash_softc *fl, size_t poffset) 548 { 549 return fl->flash_if->partition.part_offset + poffset; 550 } 551 552 int 553 flash_erase(device_t self, struct flash_erase_instruction *ei) 554 { 555 struct flash_softc *sc = device_private(self); 556 KASSERT(ei != NULL); 557 struct flash_erase_instruction e = *ei; 558 559 if (sc->sc_readonly) 560 return EACCES; 561 562 /* adjust for flash partition */ 563 e.ei_addr += sc->flash_if->partition.part_offset; 564 565 /* bounds check for flash partition */ 566 if (e.ei_addr + e.ei_len > sc->flash_if->partition.part_size + 567 sc->flash_if->partition.part_offset) 568 return EINVAL; 569 570 return sc->flash_if->erase(device_parent(self), &e); 571 } 572 573 int 574 flash_read(device_t self, 575 flash_off_t offset, size_t len, size_t *retlen, uint8_t *buf) 576 { 577 struct flash_softc *sc = device_private(self); 578 579 offset += sc->flash_if->partition.part_offset; 580 581 if (offset + len > sc->flash_if->partition.part_size + 582 sc->flash_if->partition.part_offset) 583 return EINVAL; 584 585 return sc->flash_if->read(device_parent(self), 586 offset, len, retlen, buf); 587 } 588 589 int 590 flash_write(device_t self, 591 flash_off_t offset, size_t len, size_t *retlen, const uint8_t *buf) 592 { 593 struct flash_softc *sc = device_private(self); 594 595 if (sc->sc_readonly) 596 return EACCES; 597 598 offset += sc->flash_if->partition.part_offset; 599 600 if (offset + len > sc->flash_if->partition.part_size + 601 sc->flash_if->partition.part_offset) 602 return EINVAL; 603 604 return sc->flash_if->write(device_parent(self), 605 offset, len, retlen, buf); 606 } 607 608 int 609 flash_block_markbad(device_t self, flash_off_t offset) 610 { 611 struct flash_softc *sc = device_private(self); 612 613 if (sc->sc_readonly) 614 return EACCES; 615 616 offset += sc->flash_if->partition.part_offset; 617 618 if (offset + sc->flash_if->erasesize >= 619 sc->flash_if->partition.part_size + 620 sc->flash_if->partition.part_offset) 621 return EINVAL; 622 623 return sc->flash_if->block_markbad(device_parent(self), offset); 624 } 625 626 int 627 flash_block_isbad(device_t self, flash_off_t offset, bool *bad) 628 { 629 struct flash_softc *sc = device_private(self); 630 631 offset += sc->flash_if->partition.part_offset; 632 633 if (offset + sc->flash_if->erasesize > 634 sc->flash_if->partition.part_size + 635 sc->flash_if->partition.part_offset) 636 return EINVAL; 637 638 return sc->flash_if->block_isbad(device_parent(self), offset, bad); 639 } 640 641 int 642 flash_sync(device_t self) 643 { 644 struct flash_softc *sc = device_private(self); 645 646 if (sc->sc_readonly) 647 return EACCES; 648 649 /* noop now TODO: implement */ 650 return 0; 651 } 652 653 MODULE(MODULE_CLASS_DRIVER, flash, NULL); 654 655 #ifdef _MODULE 656 #include "ioconf.c" 657 #endif 658 659 static int 660 flash_modcmd(modcmd_t cmd, void *opaque) 661 { 662 int error = 0; 663 #ifdef _MODULE 664 int bmaj = -1, cmaj = -1; 665 #endif 666 667 switch (cmd) { 668 case MODULE_CMD_INIT: 669 #ifdef _MODULE 670 error = config_init_component(cfdriver_ioconf_flash, 671 cfattach_ioconf_flash, cfdata_ioconf_flash); 672 if (error) 673 return error; 674 error = devsw_attach("flash", &flash_bdevsw, &bmaj, 675 &flash_cdevsw, &cmaj); 676 if (error) 677 config_fini_component(cfdriver_ioconf_flash, 678 cfattach_ioconf_flash, cfdata_ioconf_flash); 679 #endif 680 return error; 681 case MODULE_CMD_FINI: 682 #ifdef _MODULE 683 devsw_detach(&flash_bdevsw, &flash_cdevsw); 684 error = config_fini_component(cfdriver_ioconf_flash, 685 cfattach_ioconf_flash, cfdata_ioconf_flash); 686 #endif 687 return error; 688 default: 689 return ENOTTY; 690 } 691 } 692
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