flash.c revision 1.1.4.3
1 /* $NetBSD: flash.c,v 1.1.4.3 2011/04/21 01:41:46 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 1.1.4.3 2011/04/21 01:41:46 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 printf("freeing flash_if..."); 220 kmem_free(sc->flash_if, sizeof(*sc->flash_if)); 221 printf("done!\n"); 222 223 return 0; 224 } 225 226 int 227 flash_print(void *aux, const char *pnp) 228 { 229 struct flash_attach_args *arg; 230 const char *type; 231 232 if (pnp != NULL) { 233 arg = aux; 234 switch (arg->flash_if->type) { 235 case FLASH_TYPE_NOR: 236 type = "NOR"; 237 break; 238 case FLASH_TYPE_NAND: 239 type = "NAND"; 240 break; 241 default: 242 panic("flash_print: unknown type %d", 243 arg->flash_if->type); 244 } 245 aprint_normal("%s flash at %s", type, pnp); 246 } 247 return UNCONF; 248 } 249 250 device_t 251 flash_attach_mi(struct flash_interface *flash_if, device_t device) 252 { 253 struct flash_attach_args arg; 254 255 #ifdef DIAGNOSTIC 256 if (flash_if == NULL) { 257 aprint_error("flash_attach_mi: NULL\n"); 258 return 0; 259 } 260 #endif 261 arg.flash_if = flash_if; 262 263 return config_found_ia(device, "flashbus", &arg, flash_print); 264 } 265 266 /** 267 * flash_open - open the character device 268 * Checks if there is a driver registered to the minor number of the open 269 * request. 270 */ 271 int 272 flashopen(dev_t dev, int flags, int fmt, struct lwp *l) 273 { 274 int unit = minor(dev); 275 struct flash_softc *sc; 276 277 DPRINTFN(1, ("flash: opening device unit %d\n", unit)); 278 279 if ((sc = device_lookup_private(&flash_cd, unit)) == NULL) 280 return ENXIO; 281 282 /* TODO return eperm if want to open for writing a read only dev */ 283 284 /* reset buffer length */ 285 // sc->sc_cache->fc_len = 0; 286 287 return 0; 288 } 289 290 /** 291 * flash_close - close device 292 * We don't have to release any resources, so just return 0. 293 */ 294 int 295 flashclose(dev_t dev, int flags, int fmt, struct lwp *l) 296 { 297 int unit = minor(dev); 298 struct flash_softc *sc; 299 int err; 300 301 DPRINTFN(1, ("flash: closing flash device unit %d\n", unit)); 302 303 if ((sc = device_lookup_private(&flash_cd, unit)) == NULL) 304 return ENXIO; 305 306 if (!sc->sc_readonly) { 307 err = flash_sync(sc->sc_dev); 308 if (err) 309 return err; 310 } 311 312 return 0; 313 } 314 315 /** 316 * flash_read - read from character device 317 * This function uses the registered driver's read function to read the requested length to 318 * a buffer and then moves this buffer to userspace. 319 */ 320 int 321 flashread(dev_t dev, struct uio *uio, int flag) 322 { 323 return physio(flashstrategy, NULL, dev, B_READ, minphys, uio); 324 } 325 326 /** 327 * flash_write - write to character device 328 * This function moves the data into a buffer from userspace to kernel space, 329 * then uses the registered driver's write function to write out the data to 330 * the media. 331 */ 332 int 333 flashwrite(dev_t dev, struct uio *uio, int flag) 334 { 335 return physio(flashstrategy, NULL, dev, B_WRITE, minphys, uio); 336 } 337 338 void 339 flashstrategy(struct buf *bp) 340 { 341 struct flash_softc *sc; 342 const struct flash_interface *flash_if; 343 const struct flash_partition *part; 344 int unit, device_blks; 345 346 unit = minor(bp->b_dev); 347 sc = device_lookup_private(&flash_cd, unit); 348 if (sc == NULL) { 349 bp->b_error = ENXIO; 350 goto done; 351 } 352 353 flash_if = sc->flash_if; 354 part = &flash_if->partition; 355 356 /* divider */ 357 KASSERT(flash_if->writesize != 0); 358 359 aprint_debug_dev(sc->sc_dev, "flash_strategy()\n"); 360 361 if (!(bp->b_flags & B_READ) && sc->sc_readonly) { 362 bp->b_error = EACCES; 363 goto done; 364 } 365 366 /* check if length is not negative */ 367 if (bp->b_blkno < 0) { 368 bp->b_error = EINVAL; 369 goto done; 370 } 371 372 /* zero lenght i/o */ 373 if (bp->b_bcount == 0) { 374 goto done; 375 } 376 377 device_blks = sc->flash_if->size / DEV_BSIZE; 378 KASSERT(part->part_offset % DEV_BSIZE == 0); 379 bp->b_rawblkno = bp->b_blkno + (part->part_offset / DEV_BSIZE); 380 381 if (bounds_check_with_mediasize(bp, DEV_BSIZE, device_blks) <= 0) { 382 goto done; 383 } 384 385 bp->b_resid = bp->b_bcount; 386 flash_if->submit(sc->sc_parent_dev, bp); 387 388 return; 389 done: 390 bp->b_resid = bp->b_bcount; 391 biodone(bp); 392 } 393 394 /* 395 * Handle the ioctl for the device 396 */ 397 int 398 flashioctl(dev_t dev, u_long command, void *data, int flags, struct lwp *l) 399 { 400 struct flash_erase_params *ep; 401 struct flash_info_params *ip; 402 struct flash_dump_params *dp; 403 struct flash_badblock_params *bbp; 404 struct flash_erase_instruction ei; 405 struct flash_softc *sc; 406 int unit, err; 407 size_t retlen; 408 flash_off_t offset; 409 bool bad; 410 411 unit = minor(dev); 412 if ((sc = device_lookup_private(&flash_cd, unit)) == NULL) 413 return ENXIO; 414 415 err = 0; 416 switch (command) { 417 case FLASH_ERASE_BLOCK: 418 /** 419 * Set up an erase instruction then call the registered 420 * driver's erase operation. 421 */ 422 ep = data; 423 424 if (sc->sc_readonly) { 425 return EACCES; 426 } 427 428 ei.ei_addr = ep->ep_addr; 429 ei.ei_len = ep->ep_len; 430 ei.ei_callback = NULL; 431 432 err = flash_erase(sc->sc_dev, &ei); 433 if (err) { 434 return err; 435 } 436 437 break; 438 case FLASH_BLOCK_ISBAD: 439 /** 440 * Set up an erase instruction then call the registered 441 * driver's erase operation. 442 */ 443 bbp = data; 444 445 err = flash_block_isbad(sc->sc_dev, bbp->bbp_addr, &bad); 446 if (err) { 447 return err; 448 } 449 bbp->bbp_isbad = bad; 450 451 break; 452 case FLASH_BLOCK_MARKBAD: 453 bbp = data; 454 455 err = flash_block_markbad(sc->sc_dev, bbp->bbp_addr); 456 457 break; 458 case FLASH_DUMP: 459 dp = data; 460 offset = dp->dp_block * sc->flash_if->erasesize; 461 DPRINTF(("Reading from block: %jd len: %jd\n", 462 (intmax_t )dp->dp_block, (intmax_t )dp->dp_len)); 463 err = flash_read(sc->sc_parent_dev, offset, dp->dp_len, 464 &retlen, dp->dp_buf); 465 if (err) 466 return err; 467 if (retlen != dp->dp_len) { 468 dp->dp_len = -1; 469 dp->dp_buf = NULL; 470 } 471 472 break; 473 case FLASH_GET_INFO: 474 ip = data; 475 476 ip->ip_page_size = sc->flash_if->page_size; 477 ip->ip_erase_size = sc->flash_if->erasesize; 478 ip->ip_flash_type = sc->flash_if->type; 479 ip->ip_flash_size = sc->flash_if->size; 480 break; 481 default: 482 err = ENODEV; 483 } 484 485 return err; 486 } 487 488 int 489 flashsize(dev_t dev) 490 { 491 return -1; 492 } 493 494 int 495 flashdump(dev_t dev, daddr_t blkno, void *va, size_t size) 496 { 497 return EACCES; 498 } 499 500 bool 501 flash_shutdown(device_t self, int how) 502 { 503 struct flash_softc *sc = device_private(self); 504 505 if ((how & RB_NOSYNC) == 0 && !sc->sc_readonly) 506 flash_sync(self); 507 508 return true; 509 } 510 511 const struct flash_interface * 512 flash_get_interface(dev_t dev) 513 { 514 struct flash_softc *sc; 515 int unit; 516 517 unit = minor(dev); 518 if ((sc = device_lookup_private(&flash_cd, unit)) == NULL) 519 return NULL; 520 521 return sc->flash_if; 522 } 523 524 const struct flash_softc * 525 flash_get_softc(dev_t dev) 526 { 527 struct flash_softc *sc; 528 int unit; 529 530 unit = minor(dev); 531 sc = device_lookup_private(&flash_cd, unit); 532 533 return sc; 534 } 535 536 device_t 537 flash_get_device(dev_t dev) 538 { 539 struct flash_softc *sc; 540 int unit; 541 542 unit = minor(dev); 543 sc = device_lookup_private(&flash_cd, unit); 544 545 return sc->sc_dev; 546 } 547 548 static inline flash_off_t 549 flash_get_part_offset(struct flash_softc *fl, size_t poffset) 550 { 551 return fl->flash_if->partition.part_offset + poffset; 552 } 553 554 int 555 flash_erase(device_t self, struct flash_erase_instruction *ei) 556 { 557 struct flash_softc *sc = device_private(self); 558 KASSERT(ei != NULL); 559 struct flash_erase_instruction e = *ei; 560 561 if (sc->sc_readonly) 562 return EACCES; 563 564 /* adjust for flash partition */ 565 e.ei_addr += sc->flash_if->partition.part_offset; 566 567 /* bounds check for flash partition */ 568 if (e.ei_addr + e.ei_len > sc->flash_if->partition.part_size + 569 sc->flash_if->partition.part_offset) 570 return EINVAL; 571 572 return sc->flash_if->erase(device_parent(self), &e); 573 } 574 575 int 576 flash_read(device_t self, 577 flash_off_t offset, size_t len, size_t *retlen, uint8_t *buf) 578 { 579 struct flash_softc *sc = device_private(self); 580 581 offset += sc->flash_if->partition.part_offset; 582 583 if (offset + len > sc->flash_if->partition.part_size + 584 sc->flash_if->partition.part_offset) 585 return EINVAL; 586 587 return sc->flash_if->read(device_parent(self), 588 offset, len, retlen, buf); 589 } 590 591 int 592 flash_write(device_t self, 593 flash_off_t offset, size_t len, size_t *retlen, const uint8_t *buf) 594 { 595 struct flash_softc *sc = device_private(self); 596 597 if (sc->sc_readonly) 598 return EACCES; 599 600 offset += sc->flash_if->partition.part_offset; 601 602 if (offset + len > sc->flash_if->partition.part_size + 603 sc->flash_if->partition.part_offset) 604 return EINVAL; 605 606 return sc->flash_if->write(device_parent(self), 607 offset, len, retlen, buf); 608 } 609 610 int 611 flash_block_markbad(device_t self, flash_off_t offset) 612 { 613 struct flash_softc *sc = device_private(self); 614 615 if (sc->sc_readonly) 616 return EACCES; 617 618 offset += sc->flash_if->partition.part_offset; 619 620 if (offset + sc->flash_if->erasesize >= 621 sc->flash_if->partition.part_size + 622 sc->flash_if->partition.part_offset) 623 return EINVAL; 624 625 return sc->flash_if->block_markbad(device_parent(self), offset); 626 } 627 628 int 629 flash_block_isbad(device_t self, flash_off_t offset, bool *bad) 630 { 631 struct flash_softc *sc = device_private(self); 632 633 offset += sc->flash_if->partition.part_offset; 634 635 if (offset + sc->flash_if->erasesize > 636 sc->flash_if->partition.part_size + 637 sc->flash_if->partition.part_offset) 638 return EINVAL; 639 640 return sc->flash_if->block_isbad(device_parent(self), offset, bad); 641 } 642 643 int 644 flash_sync(device_t self) 645 { 646 struct flash_softc *sc = device_private(self); 647 648 if (sc->sc_readonly) 649 return EACCES; 650 651 /* noop now TODO: implement */ 652 return 0; 653 } 654 655 MODULE(MODULE_CLASS_DRIVER, flash, NULL); 656 657 #ifdef _MODULE 658 #include "ioconf.c" 659 #endif 660 661 static int 662 flash_modcmd(modcmd_t cmd, void *opaque) 663 { 664 int error = 0; 665 #ifdef _MODULE 666 int bmaj = -1, cmaj = -1; 667 #endif 668 669 switch (cmd) { 670 case MODULE_CMD_INIT: 671 #ifdef _MODULE 672 error = config_init_component(cfdriver_ioconf_flash, 673 cfattach_ioconf_flash, cfdata_ioconf_flash); 674 if (error) 675 return error; 676 error = devsw_attach("flash", &flash_bdevsw, &bmaj, 677 &flash_cdevsw, &cmaj); 678 if (error) 679 config_fini_component(cfdriver_ioconf_flash, 680 cfattach_ioconf_flash, cfdata_ioconf_flash); 681 #endif 682 return error; 683 case MODULE_CMD_FINI: 684 #ifdef _MODULE 685 devsw_detach(&flash_bdevsw, &flash_cdevsw); 686 error = config_fini_component(cfdriver_ioconf_flash, 687 cfattach_ioconf_flash, cfdata_ioconf_flash); 688 #endif 689 return error; 690 default: 691 return ENOTTY; 692 } 693 } 694
Indexes created Wed Oct 01 07:09:59 GMT 2025