mmc.c revision 170337
1/*- 2 * Copyright (c) 2006 Bernd Walter. All rights reserved. 3 * Copyright (c) 2006 M. Warner Losh. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 17 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 * 25 * Portions of this software may have been developed with reference to 26 * the SD Simplified Specification. The following disclaimer may apply: 27 * 28 * The following conditions apply to the release of the simplified 29 * specification ("Simplified Specification") by the SD Card Association and 30 * the SD Group. The Simplified Specification is a subset of the complete SD 31 * Specification which is owned by the SD Card Association and the SD 32 * Group. This Simplified Specification is provided on a non-confidential 33 * basis subject to the disclaimers below. Any implementation of the 34 * Simplified Specification may require a license from the SD Card 35 * Association, SD Group, SD-3C LLC or other third parties. 36 * 37 * Disclaimers: 38 * 39 * The information contained in the Simplified Specification is presented only 40 * as a standard specification for SD Cards and SD Host/Ancillary products and 41 * is provided "AS-IS" without any representations or warranties of any 42 * kind. No responsibility is assumed by the SD Group, SD-3C LLC or the SD 43 * Card Association for any damages, any infringements of patents or other 44 * right of the SD Group, SD-3C LLC, the SD Card Association or any third 45 * parties, which may result from its use. No license is granted by 46 * implication, estoppel or otherwise under any patent or other rights of the 47 * SD Group, SD-3C LLC, the SD Card Association or any third party. Nothing 48 * herein shall be construed as an obligation by the SD Group, the SD-3C LLC 49 * or the SD Card Association to disclose or distribute any technical 50 * information, know-how or other confidential information to any third party. 51 */ 52 53#include <sys/cdefs.h> 54__FBSDID("$FreeBSD: head/sys/dev/mmc/mmc.c 170337 2007-06-05 17:04:44Z imp $"); 55 56#include <sys/param.h> 57#include <sys/systm.h> 58#include <sys/kernel.h> 59#include <sys/malloc.h> 60#include <sys/lock.h> 61#include <sys/module.h> 62#include <sys/mutex.h> 63#include <sys/bus.h> 64 65#include <dev/mmc/mmcreg.h> 66#include <dev/mmc/mmcbrvar.h> 67#include <dev/mmc/mmcvar.h> 68#include "mmcbr_if.h" 69#include "mmcbus_if.h" 70 71struct mmc_softc { 72 device_t dev; 73 struct mtx sc_mtx; 74 struct intr_config_hook config_intrhook; 75 device_t owner; 76 uint32_t last_rca; 77}; 78 79/* 80 * Per-card data 81 */ 82struct mmc_ivars { 83 uint32_t raw_cid[4]; /* Raw bits of the CID */ 84 uint32_t raw_csd[4]; /* Raw bits of the CSD */ 85 uint16_t rca; 86 enum mmc_card_mode mode; 87 struct mmc_cid cid; /* cid decoded */ 88 struct mmc_csd csd; /* csd decoded */ 89}; 90 91#define CMD_RETRIES 3 92 93/* bus entry points */ 94static int mmc_probe(device_t dev); 95static int mmc_attach(device_t dev); 96static int mmc_detach(device_t dev); 97 98#define MMC_LOCK(_sc) mtx_lock(&(_sc)->sc_mtx) 99#define MMC_UNLOCK(_sc) mtx_unlock(&(_sc)->sc_mtx) 100#define MMC_LOCK_INIT(_sc) \ 101 mtx_init(&_sc->sc_mtx, device_get_nameunit(_sc->dev), \ 102 "mmc", MTX_DEF) 103#define MMC_LOCK_DESTROY(_sc) mtx_destroy(&_sc->sc_mtx); 104#define MMC_ASSERT_LOCKED(_sc) mtx_assert(&_sc->sc_mtx, MA_OWNED); 105#define MMC_ASSERT_UNLOCKED(_sc) mtx_assert(&_sc->sc_mtx, MA_NOTOWNED); 106 107static void mmc_delayed_attach(void *); 108static int mmc_wait_for_cmd(struct mmc_softc *sc, struct mmc_command *cmd, 109 int retries); 110static int mmc_wait_for_command(struct mmc_softc *sc, uint32_t opcode, 111 uint32_t arg, uint32_t flags, uint32_t *resp, int retries); 112 113static void 114mmc_ms_delay(int ms) 115{ 116 DELAY(1000 * ms); /* XXX BAD */ 117} 118 119static int 120mmc_probe(device_t dev) 121{ 122 123 device_set_desc(dev, "mmc/sd bus"); 124 return (0); 125} 126 127static int 128mmc_attach(device_t dev) 129{ 130 struct mmc_softc *sc; 131 132 sc = device_get_softc(dev); 133 sc->dev = dev; 134 MMC_LOCK_INIT(sc); 135 136 /* We'll probe and attach our children later, but before / mount */ 137 sc->config_intrhook.ich_func = mmc_delayed_attach; 138 sc->config_intrhook.ich_arg = sc; 139 if (config_intrhook_establish(&sc->config_intrhook) != 0) 140 device_printf(dev, "config_intrhook_establish failed\n"); 141 return (0); 142} 143 144static int 145mmc_detach(device_t dev) 146{ 147 struct mmc_softc *sc = device_get_softc(dev); 148 device_t *kids; 149 int i, nkid; 150 151 /* kill children [ph33r]. -sorbo */ 152 if (device_get_children(sc->dev, &kids, &nkid) != 0) 153 return 0; 154 for (i = 0; i < nkid; i++) { 155 device_t kid = kids[i]; 156 void *ivar = device_get_ivars(kid); 157 158 device_detach(kid); 159 device_delete_child(sc->dev, kid); 160 free(ivar, M_DEVBUF); 161 } 162 free(kids, M_TEMP); 163 164 MMC_LOCK_DESTROY(sc); 165 166 return 0; 167} 168 169static int 170mmc_acquire_bus(device_t busdev, device_t dev) 171{ 172 struct mmc_softc *sc; 173 int err; 174 int rca; 175 176 err = MMCBR_ACQUIRE_HOST(device_get_parent(busdev), dev); 177 if (err) 178 return (err); 179 sc = device_get_softc(busdev); 180 MMC_LOCK(sc); 181 if (sc->owner) 182 panic("mmc: host bridge didn't seralize us."); 183 sc->owner = dev; 184 MMC_UNLOCK(sc); 185 186 if (busdev != dev) { 187 // Keep track of the last rca that we've selected. If 188 // we're asked to do it again, don't. We never unselect 189 // unless the bus code itself wants the mmc bus. 190 rca = mmc_get_rca(dev); 191 if (sc->last_rca != rca) { 192 mmc_wait_for_command(sc, MMC_SELECT_CARD, rca << 16, 193 MMC_RSP_R1 | MMC_CMD_AC, NULL, CMD_RETRIES); 194 sc->last_rca = rca; 195 } 196 // XXX should set bus width here? 197 } else { 198 // If there's a card selected, stand down. 199 if (sc->last_rca != 0) { 200 mmc_wait_for_command(sc, MMC_SELECT_CARD, 0, 201 MMC_RSP_R1 | MMC_CMD_AC, NULL, CMD_RETRIES); 202 sc->last_rca = 0; 203 } 204 // XXX should set bus width here? 205 } 206 207 return (0); 208} 209 210static int 211mmc_release_bus(device_t busdev, device_t dev) 212{ 213 struct mmc_softc *sc; 214 int err; 215 216 sc = device_get_softc(busdev); 217 218 MMC_LOCK(sc); 219 if (!sc->owner) 220 panic("mmc: releasing unowned bus."); 221 if (sc->owner != dev) 222 panic("mmc: you don't own the bus. game over."); 223 MMC_UNLOCK(sc); 224 err = MMCBR_RELEASE_HOST(device_get_parent(busdev), dev); 225 if (err) 226 return (err); 227 MMC_LOCK(sc); 228 sc->owner = NULL; 229 MMC_UNLOCK(sc); 230 return (0); 231} 232 233static void 234mmc_rescan_cards(struct mmc_softc *sc) 235{ 236 /* XXX: Look at the children and see if they respond to status */ 237} 238 239static uint32_t 240mmc_select_vdd(struct mmc_softc *sc, uint32_t ocr) 241{ 242 // XXX 243 return ocr; 244} 245 246static int 247mmc_highest_voltage(uint32_t ocr) 248{ 249 int i; 250 251 for (i = 30; i >= 0; i--) 252 if (ocr & (1 << i)) 253 return i; 254 return (-1); 255} 256 257static void 258mmc_wakeup(struct mmc_request *req) 259{ 260 struct mmc_softc *sc; 261 262// printf("Wakeup for req %p done_data %p\n", req, req->done_data); 263 sc = (struct mmc_softc *)req->done_data; 264 MMC_LOCK(sc); 265 req->flags |= MMC_REQ_DONE; 266 wakeup(req); 267 MMC_UNLOCK(sc); 268} 269 270static int 271mmc_wait_for_req(struct mmc_softc *sc, struct mmc_request *req) 272{ 273 int err; 274 275 req->done = mmc_wakeup; 276 req->done_data = sc; 277// printf("Submitting request %p sc %p\n", req, sc); 278 MMCBR_REQUEST(device_get_parent(sc->dev), sc->dev, req); 279 MMC_LOCK(sc); 280 do { 281 err = msleep(req, &sc->sc_mtx, PZERO | PCATCH, "mmcreq", 282 hz / 10); 283 } while (!(req->flags & MMC_REQ_DONE) && err == EAGAIN); 284// printf("Request %p done with error %d\n", req, err); 285 MMC_UNLOCK(sc); 286 return (err); 287} 288 289static int 290mmc_wait_for_request(device_t brdev, device_t reqdev, struct mmc_request *req) 291{ 292 struct mmc_softc *sc = device_get_softc(brdev); 293 294 return mmc_wait_for_req(sc, req); 295} 296 297static int 298mmc_wait_for_cmd(struct mmc_softc *sc, struct mmc_command *cmd, int retries) 299{ 300 struct mmc_request mreq; 301 302 memset(&mreq, 0, sizeof(mreq)); 303 memset(cmd->resp, 0, sizeof(cmd->resp)); 304 cmd->retries = retries; 305 cmd->data = NULL; 306 mreq.cmd = cmd; 307// printf("CMD: %x ARG %x\n", cmd->opcode, cmd->arg); 308 mmc_wait_for_req(sc, &mreq); 309 return (cmd->error); 310} 311 312static int 313mmc_wait_for_app_cmd(struct mmc_softc *sc, uint32_t rca, 314 struct mmc_command *cmd, int retries) 315{ 316 struct mmc_command appcmd; 317 int err = MMC_ERR_NONE, i; 318 319 for (i = 0; i <= retries; i++) { 320 appcmd.opcode = MMC_APP_CMD; 321 appcmd.arg = rca << 16; 322 appcmd.flags = MMC_RSP_R1 | MMC_CMD_AC; 323 mmc_wait_for_cmd(sc, &appcmd, 0); 324 err = appcmd.error; 325 if (err != MMC_ERR_NONE) 326 continue; 327 if (!(appcmd.resp[0] & R1_APP_CMD)) 328 return MMC_ERR_FAILED; 329 mmc_wait_for_cmd(sc, cmd, 0); 330 err = cmd->error; 331 if (err == MMC_ERR_NONE) 332 break; 333 } 334 return (err); 335} 336 337static int 338mmc_wait_for_command(struct mmc_softc *sc, uint32_t opcode, 339 uint32_t arg, uint32_t flags, uint32_t *resp, int retries) 340{ 341 struct mmc_command cmd; 342 int err; 343 344 memset(&cmd, 0, sizeof(cmd)); 345 cmd.opcode = opcode; 346 cmd.arg = arg; 347 cmd.flags = flags; 348 err = mmc_wait_for_cmd(sc, &cmd, retries); 349 if (err) 350 return (err); 351 if (cmd.error) 352 return (cmd.error); 353 if (resp) { 354 if (flags & MMC_RSP_136) 355 memcpy(resp, cmd.resp, 4 * sizeof(uint32_t)); 356 else 357 *resp = cmd.resp[0]; 358 } 359 return (0); 360} 361 362static void 363mmc_idle_cards(struct mmc_softc *sc) 364{ 365 device_t dev; 366 struct mmc_command cmd; 367 368 dev = sc->dev; 369 mmcbr_set_chip_select(dev, cs_high); 370 mmcbr_update_ios(dev); 371 mmc_ms_delay(1); 372 373 memset(&cmd, 0, sizeof(cmd)); 374 cmd.opcode = MMC_GO_IDLE_STATE; 375 cmd.arg = 0; 376 cmd.flags = MMC_RSP_NONE | MMC_CMD_BC; 377 mmc_wait_for_cmd(sc, &cmd, 0); 378 mmc_ms_delay(1); 379 380 mmcbr_set_chip_select(dev, cs_dontcare); 381 mmcbr_update_ios(dev); 382 mmc_ms_delay(1); 383} 384 385static int 386mmc_send_app_op_cond(struct mmc_softc *sc, uint32_t ocr, uint32_t *rocr) 387{ 388 struct mmc_command cmd; 389 int err = MMC_ERR_NONE, i; 390 391 memset(&cmd, 0, sizeof(cmd)); 392 cmd.opcode = ACMD_SD_SEND_OP_COND; 393 cmd.arg = ocr; 394 cmd.flags = MMC_RSP_R3 | MMC_CMD_BCR; 395 396 for (i = 0; i < 100; i++) { 397 err = mmc_wait_for_app_cmd(sc, 0, &cmd, CMD_RETRIES); 398 if (err != MMC_ERR_NONE) 399 break; 400 if ((cmd.resp[0] & MMC_OCR_CARD_BUSY) || ocr == 0) 401 break; 402 err = MMC_ERR_TIMEOUT; 403 mmc_ms_delay(10); 404 } 405 if (rocr && err == MMC_ERR_NONE) 406 *rocr = cmd.resp[0]; 407 return err; 408} 409 410static int 411mmc_send_op_cond(struct mmc_softc *sc, uint32_t ocr, uint32_t *rocr) 412{ 413 struct mmc_command cmd; 414 int err = MMC_ERR_NONE, i; 415 416 memset(&cmd, 0, sizeof(cmd)); 417 cmd.opcode = MMC_SEND_OP_COND; 418 cmd.arg = ocr; 419 cmd.flags = MMC_RSP_R3 | MMC_CMD_BCR; 420 421 for (i = 0; i < 100; i++) { 422 err = mmc_wait_for_cmd(sc, &cmd, CMD_RETRIES); 423 if (err != MMC_ERR_NONE) 424 break; 425 if ((cmd.resp[0] & MMC_OCR_CARD_BUSY) || ocr == 0) 426 break; 427 err = MMC_ERR_TIMEOUT; 428 mmc_ms_delay(10); 429 } 430 if (rocr && err == MMC_ERR_NONE) 431 *rocr = cmd.resp[0]; 432 return err; 433} 434 435static void 436mmc_power_up(struct mmc_softc *sc) 437{ 438 device_t dev; 439 440 dev = sc->dev; 441 mmcbr_set_vdd(dev, mmc_highest_voltage(mmcbr_get_host_ocr(dev))); 442 mmcbr_set_bus_mode(dev, opendrain); 443 mmcbr_set_chip_select(dev, cs_dontcare); 444 mmcbr_set_bus_width(dev, bus_width_1); 445 mmcbr_set_power_mode(dev, power_up); 446 mmcbr_set_clock(dev, 0); 447 mmcbr_update_ios(dev); 448 mmc_ms_delay(1); 449 450 mmcbr_set_clock(dev, mmcbr_get_f_min(sc->dev)); 451 mmcbr_set_power_mode(dev, power_on); 452 mmcbr_update_ios(dev); 453 mmc_ms_delay(2); 454} 455 456// I wonder if the following is endian safe. 457static uint32_t 458mmc_get_bits(uint32_t *bits, int start, int size) 459{ 460 const int i = 3 - (start / 32); 461 const int shift = start & 31; 462 uint32_t retval = bits[i] >> shift; 463 if (size + shift > 32) 464 retval |= bits[i - 1] << (32 - shift); 465 return retval & ((1 << size) - 1); 466} 467 468static void 469mmc_decode_cid(int is_sd, uint32_t *raw_cid, struct mmc_cid *cid) 470{ 471 int i; 472 473 memset(cid, 0, sizeof(*cid)); 474 if (is_sd) { 475 /* There's no version info, so we take it on faith */ 476 cid->mid = mmc_get_bits(raw_cid, 120, 8); 477 cid->oid = mmc_get_bits(raw_cid, 104, 16); 478 for (i = 0; i < 5; i++) 479 cid->pnm[i] = mmc_get_bits(raw_cid, 96 - i * 8, 8); 480 cid->prv = mmc_get_bits(raw_cid, 56, 8); 481 cid->psn = mmc_get_bits(raw_cid, 24, 32); 482 cid->mdt_year = mmc_get_bits(raw_cid, 12, 8) + 2001; 483 cid->mdt_month = mmc_get_bits(raw_cid, 8, 4); 484 } else { 485 // XXX write me 486 panic("write mmc cid decoder"); 487 } 488} 489 490static const int exp[8] = { 491 1, 10, 100, 1000, 10000, 100000, 1000000, 10000000 492}; 493static const int mant[16] = { 494 10, 12, 13, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 70, 80 495}; 496static const int cur_min[8] = { 497 500, 1000, 5000, 10000, 25000, 35000, 60000, 100000 498}; 499static const int cur_max[8] = { 500 1000, 5000, 10000, 25000, 35000, 45000, 800000, 200000 501}; 502 503static void 504mmc_decode_csd(int is_sd, uint32_t *raw_csd, struct mmc_csd *csd) 505{ 506 int v; 507 int m; 508 int e; 509 510 memset(csd, 0, sizeof(*csd)); 511 if (is_sd) { 512 csd->csd_structure = v = mmc_get_bits(raw_csd, 126, 2); 513 if (v == 0) { 514 m = mmc_get_bits(raw_csd, 115, 4); 515 e = mmc_get_bits(raw_csd, 112, 3); 516 csd->tacc = exp[e] * mant[m] + 9 / 10; 517 csd->nsac = mmc_get_bits(raw_csd, 104, 8) * 100; 518 m = mmc_get_bits(raw_csd, 99, 4); 519 e = mmc_get_bits(raw_csd, 96, 3); 520 csd->tran_speed = exp[e] * 10000 * mant[m]; 521 csd->ccc = mmc_get_bits(raw_csd, 84, 12); 522 csd->read_bl_len = 1 << mmc_get_bits(raw_csd, 80, 4); 523 csd->read_bl_partial = mmc_get_bits(raw_csd, 79, 1); 524 csd->write_blk_misalign = mmc_get_bits(raw_csd, 78, 1); 525 csd->read_blk_misalign = mmc_get_bits(raw_csd, 77, 1); 526 csd->dsr_imp = mmc_get_bits(raw_csd, 76, 1); 527 csd->vdd_r_curr_min = cur_min[mmc_get_bits(raw_csd, 59, 3)]; 528 csd->vdd_r_curr_max = cur_max[mmc_get_bits(raw_csd, 56, 3)]; 529 csd->vdd_w_curr_min = cur_min[mmc_get_bits(raw_csd, 53, 3)]; 530 csd->vdd_w_curr_max = cur_max[mmc_get_bits(raw_csd, 50, 3)]; 531 m = mmc_get_bits(raw_csd, 62, 12); 532 e = mmc_get_bits(raw_csd, 47, 3); 533 csd->capacity = ((1 + m) << (e + 2)) * csd->read_bl_len; 534 csd->erase_blk_en = mmc_get_bits(raw_csd, 46, 1); 535 csd->sector_size = mmc_get_bits(raw_csd, 39, 7); 536 csd->wp_grp_size = mmc_get_bits(raw_csd, 32, 7); 537 csd->wp_grp_enable = mmc_get_bits(raw_csd, 31, 1); 538 csd->r2w_factor = 1 << mmc_get_bits(raw_csd, 26, 3); 539 csd->write_bl_len = 1 << mmc_get_bits(raw_csd, 22, 4); 540 csd->write_bl_partial = mmc_get_bits(raw_csd, 21, 1); 541 } else if (v == 1) { 542 panic("Write SDHC CSD parser"); 543 } else 544 panic("unknown SD CSD version"); 545 } else { 546 panic("Write a MMC CSD parser"); 547 } 548} 549 550static int 551mmc_all_send_cid(struct mmc_softc *sc, uint32_t *rawcid) 552{ 553 struct mmc_command cmd; 554 int err; 555 556 cmd.opcode = MMC_ALL_SEND_CID; 557 cmd.arg = 0; 558 cmd.flags = MMC_RSP_R2 | MMC_CMD_BCR; 559 err = mmc_wait_for_cmd(sc, &cmd, 0); 560 memcpy(rawcid, cmd.resp, 4 * sizeof(uint32_t)); 561 return (err); 562} 563 564static int 565mmc_send_csd(struct mmc_softc *sc, uint16_t rca, uint32_t *rawcid) 566{ 567 struct mmc_command cmd; 568 int err; 569 570 cmd.opcode = MMC_SEND_CSD; 571 cmd.arg = rca << 16; 572 cmd.flags = MMC_RSP_R2 | MMC_CMD_BCR; 573 err = mmc_wait_for_cmd(sc, &cmd, 0); 574 memcpy(rawcid, cmd.resp, 4 * sizeof(uint32_t)); 575 return (err); 576} 577 578static int 579mmc_send_relative_addr(struct mmc_softc *sc, uint32_t *resp) 580{ 581 struct mmc_command cmd; 582 int err; 583 584 cmd.opcode = SD_SEND_RELATIVE_ADDR; 585 cmd.arg = 0; 586 cmd.flags = MMC_RSP_R6 | MMC_CMD_BCR; 587 err = mmc_wait_for_cmd(sc, &cmd, 0); 588 *resp = cmd.resp[0]; 589 return (err); 590} 591 592static void 593mmc_discover_cards(struct mmc_softc *sc) 594{ 595 struct mmc_ivars *ivar; 596 int err; 597 uint32_t resp; 598 device_t child; 599 600 while (1) { 601 ivar = malloc(sizeof(struct mmc_ivars), M_DEVBUF, M_WAITOK); 602 if (!ivar) 603 return; 604 err = mmc_all_send_cid(sc, ivar->raw_cid); 605 if (err == MMC_ERR_TIMEOUT) 606 break; 607 if (err != MMC_ERR_NONE) { 608 printf("Error reading CID %d\n", err); 609 break; 610 } 611 if (mmcbr_get_mode(sc->dev) == mode_sd) { 612 ivar->mode = mode_sd; 613 mmc_decode_cid(1, ivar->raw_cid, &ivar->cid); 614 mmc_send_relative_addr(sc, &resp); 615 ivar->rca = resp >> 16; 616 // RO check 617 mmc_send_csd(sc, ivar->rca, ivar->raw_csd); 618 mmc_decode_csd(1, ivar->raw_csd, &ivar->csd); 619 printf("SD CARD: %lld bytes\n", (long long) 620 ivar->csd.capacity); 621 child = device_add_child(sc->dev, NULL, -1); 622 device_set_ivars(child, ivar); 623 return; 624 } 625 panic("Write MMC card code here"); 626 } 627 free(ivar, M_DEVBUF); 628} 629 630static void 631mmc_go_discovery(struct mmc_softc *sc) 632{ 633 uint32_t ocr; 634 device_t dev; 635 636 dev = sc->dev; 637 if (mmcbr_get_power_mode(dev) != power_on) { 638 // First, try SD modes 639 mmcbr_set_mode(dev, mode_sd); 640 mmc_power_up(sc); 641 mmcbr_set_bus_mode(dev, pushpull); 642 mmc_idle_cards(sc); 643 if (mmc_send_app_op_cond(sc, 0, &ocr) != MMC_ERR_NONE) { 644 // Failed, try MMC 645 mmcbr_set_mode(dev, mode_mmc); 646 if (mmc_send_op_cond(sc, 0, &ocr) != MMC_ERR_NONE) 647 return; // Failed both, punt! XXX power down? 648 } 649 mmcbr_set_ocr(dev, mmc_select_vdd(sc, ocr)); 650 if (mmcbr_get_ocr(dev) != 0) 651 mmc_idle_cards(sc); 652 } else { 653 mmcbr_set_bus_mode(dev, opendrain); 654 mmcbr_set_clock(dev, mmcbr_get_f_min(dev)); 655 mmcbr_update_ios(dev); 656 // XXX recompute vdd based on new cards? 657 } 658 /* 659 * Make sure that we have a mutually agreeable voltage to at least 660 * one card on the bus. 661 */ 662 if (mmcbr_get_ocr(dev) == 0) 663 return; 664 /* 665 * Reselect the cards after we've idled them above. 666 */ 667 if (mmcbr_get_mode(dev) == mode_sd) 668 mmc_send_app_op_cond(sc, mmcbr_get_ocr(dev), NULL); 669 else 670 mmc_send_op_cond(sc, mmcbr_get_ocr(dev), NULL); 671 mmc_discover_cards(sc); 672 673 mmcbr_set_bus_mode(dev, pushpull); 674 mmcbr_update_ios(dev); 675 bus_generic_attach(dev); 676// mmc_update_children_sysctl(dev); 677} 678 679static int 680mmc_calculate_clock(struct mmc_softc *sc) 681{ 682 int max_dtr = 0; 683 int nkid, i, f_min, f_max; 684 device_t *kids; 685 686 f_min = mmcbr_get_f_min(sc->dev); 687 f_max = mmcbr_get_f_max(sc->dev); 688 max_dtr = f_max; 689 if (device_get_children(sc->dev, &kids, &nkid) != 0) 690 panic("can't get children"); 691 for (i = 0; i < nkid; i++) 692 if (mmc_get_tran_speed(kids[i]) < max_dtr) 693 max_dtr = mmc_get_tran_speed(kids[i]); 694 free(kids, M_TEMP); 695 device_printf(sc->dev, "setting transfer rate to %d.%03dMHz\n", 696 max_dtr / 1000000, (max_dtr / 1000) % 1000); 697 return max_dtr; 698} 699 700static void 701mmc_scan(struct mmc_softc *sc) 702{ 703 device_t dev; 704 705 dev = sc->dev; 706 mmc_acquire_bus(dev, dev); 707 708 if (mmcbr_get_power_mode(dev) == power_on) 709 mmc_rescan_cards(sc); 710 mmc_go_discovery(sc); 711 mmcbr_set_clock(dev, mmc_calculate_clock(sc)); 712 mmcbr_update_ios(dev); 713 714 mmc_release_bus(dev, dev); 715 // XXX probe/attach/detach children? 716} 717 718static int 719mmc_read_ivar(device_t bus, device_t child, int which, u_char *result) 720{ 721 struct mmc_ivars *ivar = device_get_ivars(child); 722 723 switch (which) { 724 default: 725 return (EINVAL); 726 case MMC_IVAR_DSR_IMP: 727 *(int *)result = ivar->csd.dsr_imp; 728 break; 729 case MMC_IVAR_MEDIA_SIZE: 730 *(int *)result = ivar->csd.capacity; 731 break; 732 case MMC_IVAR_RCA: 733 *(int *)result = ivar->rca; 734 break; 735 case MMC_IVAR_SECTOR_SIZE: 736 *(int *)result = 512; 737 break; 738 case MMC_IVAR_TRAN_SPEED: 739 *(int *)result = ivar->csd.tran_speed; 740 break; 741 } 742 return (0); 743} 744 745static int 746mmc_write_ivar(device_t bus, device_t child, int which, uintptr_t value) 747{ 748 // None are writable ATM 749 switch (which) { 750 default: 751 return (EINVAL); 752 } 753 return (0); 754} 755 756 757static void 758mmc_delayed_attach(void *xsc) 759{ 760 struct mmc_softc *sc = xsc; 761 762 mmc_scan(sc); 763 config_intrhook_disestablish(&sc->config_intrhook); 764} 765 766static device_method_t mmc_methods[] = { 767 /* device_if */ 768 DEVMETHOD(device_probe, mmc_probe), 769 DEVMETHOD(device_attach, mmc_attach), 770 DEVMETHOD(device_detach, mmc_detach), 771 772 /* Bus interface */ 773 DEVMETHOD(bus_read_ivar, mmc_read_ivar), 774 DEVMETHOD(bus_write_ivar, mmc_write_ivar), 775 776 /* MMC Bus interface */ 777 DEVMETHOD(mmcbus_wait_for_request, mmc_wait_for_request), 778 DEVMETHOD(mmcbus_acquire_bus, mmc_acquire_bus), 779 DEVMETHOD(mmcbus_release_bus, mmc_release_bus), 780 781 {0, 0}, 782}; 783 784static driver_t mmc_driver = { 785 "mmc", 786 mmc_methods, 787 sizeof(struct mmc_softc), 788}; 789static devclass_t mmc_devclass; 790 791 792DRIVER_MODULE(mmc, at91_mci, mmc_driver, mmc_devclass, 0, 0); 793DRIVER_MODULE(mmc, sdh, mmc_driver, mmc_devclass, 0, 0); 794