1 /* 2 * linux/drivers/mmc/core/sd.c 3 * 4 * Copyright (C) 2003-2004 Russell King, All Rights Reserved. 5 * SD support Copyright (C) 2004 Ian Molton, All Rights Reserved. 6 * Copyright (C) 2005-2007 Pierre Ossman, All Rights Reserved. 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License version 2 as 10 * published by the Free Software Foundation. 11 */ 12 13 #include <linux/err.h> 14 #include <linux/slab.h> 15 16 #include <linux/mmc/host.h> 17 #include <linux/mmc/card.h> 18 #include <linux/mmc/mmc.h> 19 #include <linux/mmc/sd.h> 20 21 #include "core.h" 22 #include "bus.h" 23 #include "mmc_ops.h" 24 #include "sd.h" 25 #include "sd_ops.h" 26 27 static const unsigned int tran_exp[] = { 28 10000, 100000, 1000000, 10000000, 29 0, 0, 0, 0 30 }; 31 32 static const unsigned char tran_mant[] = { 33 0, 10, 12, 13, 15, 20, 25, 30, 34 35, 40, 45, 50, 55, 60, 70, 80, 35 }; 36 37 static const unsigned int tacc_exp[] = { 38 1, 10, 100, 1000, 10000, 100000, 1000000, 10000000, 39 }; 40 41 static const unsigned int tacc_mant[] = { 42 0, 10, 12, 13, 15, 20, 25, 30, 43 35, 40, 45, 50, 55, 60, 70, 80, 44 }; 45 46 #define UNSTUFF_BITS(resp,start,size) \ 47 ({ \ 48 const int __size = size; \ 49 const u32 __mask = (__size < 32 ? 1 << __size : 0) - 1; \ 50 const int __off = 3 - ((start) / 32); \ 51 const int __shft = (start) & 31; \ 52 u32 __res; \ 53 \ 54 __res = resp[__off] >> __shft; \ 55 if (__size + __shft > 32) \ 56 __res |= resp[__off-1] << ((32 - __shft) % 32); \ 57 __res & __mask; \ 58 }) 59 60 /* 61 * Given the decoded CSD structure, decode the raw CID to our CID structure. 62 */ 63 void mmc_decode_cid(struct mmc_card *card) 64 { 65 u32 *resp = card->raw_cid; 66 67 memset(&card->cid, 0, sizeof(struct mmc_cid)); 68 69 /* 70 * SD doesn't currently have a version field so we will 71 * have to assume we can parse this. 72 */ 73 card->cid.manfid = UNSTUFF_BITS(resp, 120, 8); 74 card->cid.oemid = UNSTUFF_BITS(resp, 104, 16); 75 card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8); 76 card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8); 77 card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8); 78 card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8); 79 card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8); 80 card->cid.hwrev = UNSTUFF_BITS(resp, 60, 4); 81 card->cid.fwrev = UNSTUFF_BITS(resp, 56, 4); 82 card->cid.serial = UNSTUFF_BITS(resp, 24, 32); 83 card->cid.year = UNSTUFF_BITS(resp, 12, 8); 84 card->cid.month = UNSTUFF_BITS(resp, 8, 4); 85 86 card->cid.year += 2000; /* SD cards year offset */ 87 } 88 89 /* 90 * Given a 128-bit response, decode to our card CSD structure. 91 */ 92 static int mmc_decode_csd(struct mmc_card *card) 93 { 94 struct mmc_csd *csd = &card->csd; 95 unsigned int e, m, csd_struct; 96 u32 *resp = card->raw_csd; 97 98 csd_struct = UNSTUFF_BITS(resp, 126, 2); 99 100 switch (csd_struct) { 101 case 0: 102 m = UNSTUFF_BITS(resp, 115, 4); 103 e = UNSTUFF_BITS(resp, 112, 3); 104 csd->tacc_ns = (tacc_exp[e] * tacc_mant[m] + 9) / 10; 105 csd->tacc_clks = UNSTUFF_BITS(resp, 104, 8) * 100; 106 107 m = UNSTUFF_BITS(resp, 99, 4); 108 e = UNSTUFF_BITS(resp, 96, 3); 109 csd->max_dtr = tran_exp[e] * tran_mant[m]; 110 csd->cmdclass = UNSTUFF_BITS(resp, 84, 12); 111 112 e = UNSTUFF_BITS(resp, 47, 3); 113 m = UNSTUFF_BITS(resp, 62, 12); 114 csd->capacity = (1 + m) << (e + 2); 115 116 csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4); 117 csd->read_partial = UNSTUFF_BITS(resp, 79, 1); 118 csd->write_misalign = UNSTUFF_BITS(resp, 78, 1); 119 csd->read_misalign = UNSTUFF_BITS(resp, 77, 1); 120 csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3); 121 csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4); 122 csd->write_partial = UNSTUFF_BITS(resp, 21, 1); 123 124 if (UNSTUFF_BITS(resp, 46, 1)) { 125 csd->erase_size = 1; 126 } else if (csd->write_blkbits >= 9) { 127 csd->erase_size = UNSTUFF_BITS(resp, 39, 7) + 1; 128 csd->erase_size <<= csd->write_blkbits - 9; 129 } 130 break; 131 case 1: 132 /* 133 * This is a block-addressed SDHC or SDXC card. Most 134 * interesting fields are unused and have fixed 135 * values. To avoid getting tripped by buggy cards, 136 * we assume those fixed values ourselves. 137 */ 138 mmc_card_set_blockaddr(card); 139 140 csd->tacc_ns = 0; /* Unused */ 141 csd->tacc_clks = 0; /* Unused */ 142 143 m = UNSTUFF_BITS(resp, 99, 4); 144 e = UNSTUFF_BITS(resp, 96, 3); 145 csd->max_dtr = tran_exp[e] * tran_mant[m]; 146 csd->cmdclass = UNSTUFF_BITS(resp, 84, 12); 147 csd->c_size = UNSTUFF_BITS(resp, 48, 22); 148 149 /* SDXC cards have a minimum C_SIZE of 0x00FFFF */ 150 if (csd->c_size >= 0xFFFF) 151 mmc_card_set_ext_capacity(card); 152 153 m = UNSTUFF_BITS(resp, 48, 22); 154 csd->capacity = (1 + m) << 10; 155 156 csd->read_blkbits = 9; 157 csd->read_partial = 0; 158 csd->write_misalign = 0; 159 csd->read_misalign = 0; 160 csd->r2w_factor = 4; /* Unused */ 161 csd->write_blkbits = 9; 162 csd->write_partial = 0; 163 csd->erase_size = 1; 164 break; 165 default: 166 printk(KERN_ERR "%s: unrecognised CSD structure version %d\n", 167 mmc_hostname(card->host), csd_struct); 168 return -EINVAL; 169 } 170 171 card->erase_size = csd->erase_size; 172 173 return 0; 174 } 175 176 /* 177 * Given a 64-bit response, decode to our card SCR structure. 178 */ 179 static int mmc_decode_scr(struct mmc_card *card) 180 { 181 struct sd_scr *scr = &card->scr; 182 unsigned int scr_struct; 183 u32 resp[4]; 184 185 resp[3] = card->raw_scr[1]; 186 resp[2] = card->raw_scr[0]; 187 188 scr_struct = UNSTUFF_BITS(resp, 60, 4); 189 if (scr_struct != 0) { 190 printk(KERN_ERR "%s: unrecognised SCR structure version %d\n", 191 mmc_hostname(card->host), scr_struct); 192 return -EINVAL; 193 } 194 195 scr->sda_vsn = UNSTUFF_BITS(resp, 56, 4); 196 scr->bus_widths = UNSTUFF_BITS(resp, 48, 4); 197 if (scr->sda_vsn == SCR_SPEC_VER_2) 198 /* Check if Physical Layer Spec v3.0 is supported */ 199 scr->sda_spec3 = UNSTUFF_BITS(resp, 47, 1); 200 201 if (UNSTUFF_BITS(resp, 55, 1)) 202 card->erased_byte = 0xFF; 203 else 204 card->erased_byte = 0x0; 205 206 if (scr->sda_spec3) 207 scr->cmds = UNSTUFF_BITS(resp, 32, 2); 208 return 0; 209 } 210 211 /* 212 * Fetch and process SD Status register. 213 */ 214 static int mmc_read_ssr(struct mmc_card *card) 215 { 216 unsigned int au, es, et, eo; 217 int err, i; 218 u32 *ssr; 219 220 if (!(card->csd.cmdclass & CCC_APP_SPEC)) { 221 printk(KERN_WARNING "%s: card lacks mandatory SD Status " 222 "function.\n", mmc_hostname(card->host)); 223 return 0; 224 } 225 226 ssr = kmalloc(64, GFP_KERNEL); 227 if (!ssr) 228 return -ENOMEM; 229 230 err = mmc_app_sd_status(card, ssr); 231 if (err) { 232 printk(KERN_WARNING "%s: problem reading SD Status " 233 "register.\n", mmc_hostname(card->host)); 234 err = 0; 235 goto out; 236 } 237 238 for (i = 0; i < 16; i++) 239 ssr[i] = be32_to_cpu(ssr[i]); 240 241 /* 242 * UNSTUFF_BITS only works with four u32s so we have to offset the 243 * bitfield positions accordingly. 244 */ 245 au = UNSTUFF_BITS(ssr, 428 - 384, 4); 246 if (au > 0 || au <= 9) { 247 card->ssr.au = 1 << (au + 4); 248 es = UNSTUFF_BITS(ssr, 408 - 384, 16); 249 et = UNSTUFF_BITS(ssr, 402 - 384, 6); 250 eo = UNSTUFF_BITS(ssr, 400 - 384, 2); 251 if (es && et) { 252 card->ssr.erase_timeout = (et * 1000) / es; 253 card->ssr.erase_offset = eo * 1000; 254 } 255 } else { 256 printk(KERN_WARNING "%s: SD Status: Invalid Allocation Unit " 257 "size.\n", mmc_hostname(card->host)); 258 } 259 out: 260 kfree(ssr); 261 return err; 262 } 263 264 /* 265 * Fetches and decodes switch information 266 */ 267 static int mmc_read_switch(struct mmc_card *card) 268 { 269 int err; 270 u8 *status; 271 272 if (card->scr.sda_vsn < SCR_SPEC_VER_1) 273 return 0; 274 275 if (!(card->csd.cmdclass & CCC_SWITCH)) { 276 printk(KERN_WARNING "%s: card lacks mandatory switch " 277 "function, performance might suffer.\n", 278 mmc_hostname(card->host)); 279 return 0; 280 } 281 282 err = -EIO; 283 284 status = kmalloc(64, GFP_KERNEL); 285 if (!status) { 286 printk(KERN_ERR "%s: could not allocate a buffer for " 287 "switch capabilities.\n", 288 mmc_hostname(card->host)); 289 return -ENOMEM; 290 } 291 292 /* Find out the supported Bus Speed Modes. */ 293 err = mmc_sd_switch(card, 0, 0, 1, status); 294 if (err) { 295 /* 296 * If the host or the card can't do the switch, 297 * fail more gracefully. 298 */ 299 if (err != -EINVAL && err != -ENOSYS && err != -EFAULT) 300 goto out; 301 302 printk(KERN_WARNING "%s: problem reading Bus Speed modes.\n", 303 mmc_hostname(card->host)); 304 err = 0; 305 306 goto out; 307 } 308 309 if (card->scr.sda_spec3) { 310 card->sw_caps.sd3_bus_mode = status[13]; 311 312 /* Find out Driver Strengths supported by the card */ 313 err = mmc_sd_switch(card, 0, 2, 1, status); 314 if (err) { 315 /* 316 * If the host or the card can't do the switch, 317 * fail more gracefully. 318 */ 319 if (err != -EINVAL && err != -ENOSYS && err != -EFAULT) 320 goto out; 321 322 printk(KERN_WARNING "%s: problem reading " 323 "Driver Strength.\n", 324 mmc_hostname(card->host)); 325 err = 0; 326 327 goto out; 328 } 329 330 card->sw_caps.sd3_drv_type = status[9]; 331 332 /* Find out Current Limits supported by the card */ 333 err = mmc_sd_switch(card, 0, 3, 1, status); 334 if (err) { 335 /* 336 * If the host or the card can't do the switch, 337 * fail more gracefully. 338 */ 339 if (err != -EINVAL && err != -ENOSYS && err != -EFAULT) 340 goto out; 341 342 printk(KERN_WARNING "%s: problem reading " 343 "Current Limit.\n", 344 mmc_hostname(card->host)); 345 err = 0; 346 347 goto out; 348 } 349 350 card->sw_caps.sd3_curr_limit = status[7]; 351 } else { 352 if (status[13] & 0x02) 353 card->sw_caps.hs_max_dtr = 50000000; 354 } 355 356 out: 357 kfree(status); 358 359 return err; 360 } 361 362 /* 363 * Test if the card supports high-speed mode and, if so, switch to it. 364 */ 365 int mmc_sd_switch_hs(struct mmc_card *card) 366 { 367 int err; 368 u8 *status; 369 370 if (card->scr.sda_vsn < SCR_SPEC_VER_1) 371 return 0; 372 373 if (!(card->csd.cmdclass & CCC_SWITCH)) 374 return 0; 375 376 if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED)) 377 return 0; 378 379 if (card->sw_caps.hs_max_dtr == 0) 380 return 0; 381 382 err = -EIO; 383 384 status = kmalloc(64, GFP_KERNEL); 385 if (!status) { 386 printk(KERN_ERR "%s: could not allocate a buffer for " 387 "switch capabilities.\n", mmc_hostname(card->host)); 388 return -ENOMEM; 389 } 390 391 err = mmc_sd_switch(card, 1, 0, 1, status); 392 if (err) 393 goto out; 394 395 if ((status[16] & 0xF) != 1) { 396 printk(KERN_WARNING "%s: Problem switching card " 397 "into high-speed mode!\n", 398 mmc_hostname(card->host)); 399 err = 0; 400 } else { 401 err = 1; 402 } 403 404 out: 405 kfree(status); 406 407 return err; 408 } 409 410 static int sd_select_driver_type(struct mmc_card *card, u8 *status) 411 { 412 int host_drv_type = SD_DRIVER_TYPE_B; 413 int card_drv_type = SD_DRIVER_TYPE_B; 414 int drive_strength; 415 int err; 416 417 /* 418 * If the host doesn't support any of the Driver Types A,C or D, 419 * or there is no board specific handler then default Driver 420 * Type B is used. 421 */ 422 if (!(card->host->caps & (MMC_CAP_DRIVER_TYPE_A | MMC_CAP_DRIVER_TYPE_C 423 | MMC_CAP_DRIVER_TYPE_D))) 424 return 0; 425 426 if (!card->host->ops->select_drive_strength) 427 return 0; 428 429 if (card->host->caps & MMC_CAP_DRIVER_TYPE_A) 430 host_drv_type |= SD_DRIVER_TYPE_A; 431 432 if (card->host->caps & MMC_CAP_DRIVER_TYPE_C) 433 host_drv_type |= SD_DRIVER_TYPE_C; 434 435 if (card->host->caps & MMC_CAP_DRIVER_TYPE_D) 436 host_drv_type |= SD_DRIVER_TYPE_D; 437 438 if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_A) 439 card_drv_type |= SD_DRIVER_TYPE_A; 440 441 if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_C) 442 card_drv_type |= SD_DRIVER_TYPE_C; 443 444 if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_D) 445 card_drv_type |= SD_DRIVER_TYPE_D; 446 447 /* 448 * The drive strength that the hardware can support 449 * depends on the board design. Pass the appropriate 450 * information and let the hardware specific code 451 * return what is possible given the options 452 */ 453 drive_strength = card->host->ops->select_drive_strength( 454 card->sw_caps.uhs_max_dtr, 455 host_drv_type, card_drv_type); 456 457 err = mmc_sd_switch(card, 1, 2, drive_strength, status); 458 if (err) 459 return err; 460 461 if ((status[15] & 0xF) != drive_strength) { 462 printk(KERN_WARNING "%s: Problem setting drive strength!\n", 463 mmc_hostname(card->host)); 464 return 0; 465 } 466 467 mmc_set_driver_type(card->host, drive_strength); 468 469 return 0; 470 } 471 472 static int sd_set_bus_speed_mode(struct mmc_card *card, u8 *status) 473 { 474 unsigned int bus_speed = 0, timing = 0; 475 int err; 476 477 /* 478 * If the host doesn't support any of the UHS-I modes, fallback on 479 * default speed. 480 */ 481 if (!(card->host->caps & (MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25 | 482 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR104 | MMC_CAP_UHS_DDR50))) 483 return 0; 484 485 if ((card->host->caps & MMC_CAP_UHS_SDR104) && 486 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) { 487 bus_speed = UHS_SDR104_BUS_SPEED; 488 timing = MMC_TIMING_UHS_SDR104; 489 card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR; 490 } else if ((card->host->caps & MMC_CAP_UHS_DDR50) && 491 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) { 492 bus_speed = UHS_DDR50_BUS_SPEED; 493 timing = MMC_TIMING_UHS_DDR50; 494 card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR; 495 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 | 496 MMC_CAP_UHS_SDR50)) && (card->sw_caps.sd3_bus_mode & 497 SD_MODE_UHS_SDR50)) { 498 bus_speed = UHS_SDR50_BUS_SPEED; 499 timing = MMC_TIMING_UHS_SDR50; 500 card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR; 501 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 | 502 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25)) && 503 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25)) { 504 bus_speed = UHS_SDR25_BUS_SPEED; 505 timing = MMC_TIMING_UHS_SDR25; 506 card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR; 507 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 | 508 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25 | 509 MMC_CAP_UHS_SDR12)) && (card->sw_caps.sd3_bus_mode & 510 SD_MODE_UHS_SDR12)) { 511 bus_speed = UHS_SDR12_BUS_SPEED; 512 timing = MMC_TIMING_UHS_SDR12; 513 card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR; 514 } 515 516 card->sd_bus_speed = bus_speed; 517 err = mmc_sd_switch(card, 1, 0, bus_speed, status); 518 if (err) 519 return err; 520 521 if ((status[16] & 0xF) != bus_speed) 522 printk(KERN_WARNING "%s: Problem setting bus speed mode!\n", 523 mmc_hostname(card->host)); 524 else { 525 mmc_set_timing(card->host, timing); 526 mmc_set_clock(card->host, card->sw_caps.uhs_max_dtr); 527 } 528 529 return 0; 530 } 531 532 static int sd_set_current_limit(struct mmc_card *card, u8 *status) 533 { 534 int current_limit = 0; 535 int err; 536 537 /* 538 * Current limit switch is only defined for SDR50, SDR104, and DDR50 539 * bus speed modes. For other bus speed modes, we set the default 540 * current limit of 200mA. 541 */ 542 if ((card->sd_bus_speed == UHS_SDR50_BUS_SPEED) || 543 (card->sd_bus_speed == UHS_SDR104_BUS_SPEED) || 544 (card->sd_bus_speed == UHS_DDR50_BUS_SPEED)) { 545 if (card->host->caps & MMC_CAP_MAX_CURRENT_800) { 546 if (card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_800) 547 current_limit = SD_SET_CURRENT_LIMIT_800; 548 else if (card->sw_caps.sd3_curr_limit & 549 SD_MAX_CURRENT_600) 550 current_limit = SD_SET_CURRENT_LIMIT_600; 551 else if (card->sw_caps.sd3_curr_limit & 552 SD_MAX_CURRENT_400) 553 current_limit = SD_SET_CURRENT_LIMIT_400; 554 else if (card->sw_caps.sd3_curr_limit & 555 SD_MAX_CURRENT_200) 556 current_limit = SD_SET_CURRENT_LIMIT_200; 557 } else if (card->host->caps & MMC_CAP_MAX_CURRENT_600) { 558 if (card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_600) 559 current_limit = SD_SET_CURRENT_LIMIT_600; 560 else if (card->sw_caps.sd3_curr_limit & 561 SD_MAX_CURRENT_400) 562 current_limit = SD_SET_CURRENT_LIMIT_400; 563 else if (card->sw_caps.sd3_curr_limit & 564 SD_MAX_CURRENT_200) 565 current_limit = SD_SET_CURRENT_LIMIT_200; 566 } else if (card->host->caps & MMC_CAP_MAX_CURRENT_400) { 567 if (card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_400) 568 current_limit = SD_SET_CURRENT_LIMIT_400; 569 else if (card->sw_caps.sd3_curr_limit & 570 SD_MAX_CURRENT_200) 571 current_limit = SD_SET_CURRENT_LIMIT_200; 572 } else if (card->host->caps & MMC_CAP_MAX_CURRENT_200) { 573 if (card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_200) 574 current_limit = SD_SET_CURRENT_LIMIT_200; 575 } 576 } else 577 current_limit = SD_SET_CURRENT_LIMIT_200; 578 579 err = mmc_sd_switch(card, 1, 3, current_limit, status); 580 if (err) 581 return err; 582 583 if (((status[15] >> 4) & 0x0F) != current_limit) 584 printk(KERN_WARNING "%s: Problem setting current limit!\n", 585 mmc_hostname(card->host)); 586 587 return 0; 588 } 589 590 /* 591 * UHS-I specific initialization procedure 592 */ 593 static int mmc_sd_init_uhs_card(struct mmc_card *card) 594 { 595 int err; 596 u8 *status; 597 598 if (!card->scr.sda_spec3) 599 return 0; 600 601 if (!(card->csd.cmdclass & CCC_SWITCH)) 602 return 0; 603 604 status = kmalloc(64, GFP_KERNEL); 605 if (!status) { 606 printk(KERN_ERR "%s: could not allocate a buffer for " 607 "switch capabilities.\n", mmc_hostname(card->host)); 608 return -ENOMEM; 609 } 610 611 /* Set 4-bit bus width */ 612 if ((card->host->caps & MMC_CAP_4_BIT_DATA) && 613 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) { 614 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4); 615 if (err) 616 goto out; 617 618 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4); 619 } 620 621 /* Set the driver strength for the card */ 622 err = sd_select_driver_type(card, status); 623 if (err) 624 goto out; 625 626 /* Set bus speed mode of the card */ 627 err = sd_set_bus_speed_mode(card, status); 628 if (err) 629 goto out; 630 631 /* Set current limit for the card */ 632 err = sd_set_current_limit(card, status); 633 if (err) 634 goto out; 635 636 /* SPI mode doesn't define CMD19 */ 637 if (!mmc_host_is_spi(card->host) && card->host->ops->execute_tuning) 638 err = card->host->ops->execute_tuning(card->host); 639 640 out: 641 kfree(status); 642 643 return err; 644 } 645 646 MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1], 647 card->raw_cid[2], card->raw_cid[3]); 648 MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1], 649 card->raw_csd[2], card->raw_csd[3]); 650 MMC_DEV_ATTR(scr, "%08x%08x\n", card->raw_scr[0], card->raw_scr[1]); 651 MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year); 652 MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9); 653 MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9); 654 MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev); 655 MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev); 656 MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid); 657 MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name); 658 MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid); 659 MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial); 660 661 662 static struct attribute *sd_std_attrs[] = { 663 &dev_attr_cid.attr, 664 &dev_attr_csd.attr, 665 &dev_attr_scr.attr, 666 &dev_attr_date.attr, 667 &dev_attr_erase_size.attr, 668 &dev_attr_preferred_erase_size.attr, 669 &dev_attr_fwrev.attr, 670 &dev_attr_hwrev.attr, 671 &dev_attr_manfid.attr, 672 &dev_attr_name.attr, 673 &dev_attr_oemid.attr, 674 &dev_attr_serial.attr, 675 NULL, 676 }; 677 678 static struct attribute_group sd_std_attr_group = { 679 .attrs = sd_std_attrs, 680 }; 681 682 static const struct attribute_group *sd_attr_groups[] = { 683 &sd_std_attr_group, 684 NULL, 685 }; 686 687 struct device_type sd_type = { 688 .groups = sd_attr_groups, 689 }; 690 691 /* 692 * Fetch CID from card. 693 */ 694 int mmc_sd_get_cid(struct mmc_host *host, u32 ocr, u32 *cid, u32 *rocr) 695 { 696 int err; 697 698 /* 699 * Since we're changing the OCR value, we seem to 700 * need to tell some cards to go back to the idle 701 * state. We wait 1ms to give cards time to 702 * respond. 703 */ 704 mmc_go_idle(host); 705 706 /* 707 * If SD_SEND_IF_COND indicates an SD 2.0 708 * compliant card and we should set bit 30 709 * of the ocr to indicate that we can handle 710 * block-addressed SDHC cards. 711 */ 712 err = mmc_send_if_cond(host, ocr); 713 if (!err) 714 ocr |= SD_OCR_CCS; 715 716 /* 717 * If the host supports one of UHS-I modes, request the card 718 * to switch to 1.8V signaling level. 719 */ 720 if (host->caps & (MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25 | 721 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR104 | MMC_CAP_UHS_DDR50)) 722 ocr |= SD_OCR_S18R; 723 724 /* If the host can supply more than 150mA, XPC should be set to 1. */ 725 if (host->caps & (MMC_CAP_SET_XPC_330 | MMC_CAP_SET_XPC_300 | 726 MMC_CAP_SET_XPC_180)) 727 ocr |= SD_OCR_XPC; 728 729 try_again: 730 err = mmc_send_app_op_cond(host, ocr, rocr); 731 if (err) 732 return err; 733 734 /* 735 * In case CCS and S18A in the response is set, start Signal Voltage 736 * Switch procedure. SPI mode doesn't support CMD11. 737 */ 738 if (!mmc_host_is_spi(host) && rocr && 739 ((*rocr & 0x41000000) == 0x41000000)) { 740 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180, true); 741 if (err) { 742 ocr &= ~SD_OCR_S18R; 743 goto try_again; 744 } 745 } 746 747 if (mmc_host_is_spi(host)) 748 err = mmc_send_cid(host, cid); 749 else 750 err = mmc_all_send_cid(host, cid); 751 752 return err; 753 } 754 755 int mmc_sd_get_csd(struct mmc_host *host, struct mmc_card *card) 756 { 757 int err; 758 759 /* 760 * Fetch CSD from card. 761 */ 762 err = mmc_send_csd(card, card->raw_csd); 763 if (err) 764 return err; 765 766 err = mmc_decode_csd(card); 767 if (err) 768 return err; 769 770 return 0; 771 } 772 773 int mmc_sd_setup_card(struct mmc_host *host, struct mmc_card *card, 774 bool reinit) 775 { 776 int err; 777 778 if (!reinit) { 779 /* 780 * Fetch SCR from card. 781 */ 782 err = mmc_app_send_scr(card, card->raw_scr); 783 if (err) 784 return err; 785 786 err = mmc_decode_scr(card); 787 if (err) 788 return err; 789 790 /* 791 * Fetch and process SD Status register. 792 */ 793 err = mmc_read_ssr(card); 794 if (err) 795 return err; 796 797 /* Erase init depends on CSD and SSR */ 798 mmc_init_erase(card); 799 800 /* 801 * Fetch switch information from card. 802 */ 803 err = mmc_read_switch(card); 804 if (err) 805 return err; 806 } 807 808 /* 809 * For SPI, enable CRC as appropriate. 810 * This CRC enable is located AFTER the reading of the 811 * card registers because some SDHC cards are not able 812 * to provide valid CRCs for non-512-byte blocks. 813 */ 814 if (mmc_host_is_spi(host)) { 815 err = mmc_spi_set_crc(host, use_spi_crc); 816 if (err) 817 return err; 818 } 819 820 /* 821 * Check if read-only switch is active. 822 */ 823 if (!reinit) { 824 int ro = -1; 825 826 if (host->ops->get_ro) 827 ro = host->ops->get_ro(host); 828 829 if (ro < 0) { 830 printk(KERN_WARNING "%s: host does not " 831 "support reading read-only " 832 "switch. assuming write-enable.\n", 833 mmc_hostname(host)); 834 } else if (ro > 0) { 835 mmc_card_set_readonly(card); 836 } 837 } 838 839 return 0; 840 } 841 842 unsigned mmc_sd_get_max_clock(struct mmc_card *card) 843 { 844 unsigned max_dtr = (unsigned int)-1; 845 846 if (mmc_card_highspeed(card)) { 847 if (max_dtr > card->sw_caps.hs_max_dtr) 848 max_dtr = card->sw_caps.hs_max_dtr; 849 } else if (max_dtr > card->csd.max_dtr) { 850 max_dtr = card->csd.max_dtr; 851 } 852 853 return max_dtr; 854 } 855 856 void mmc_sd_go_highspeed(struct mmc_card *card) 857 { 858 mmc_card_set_highspeed(card); 859 mmc_set_timing(card->host, MMC_TIMING_SD_HS); 860 } 861 862 /* 863 * Handle the detection and initialisation of a card. 864 * 865 * In the case of a resume, "oldcard" will contain the card 866 * we're trying to reinitialise. 867 */ 868 static int mmc_sd_init_card(struct mmc_host *host, u32 ocr, 869 struct mmc_card *oldcard) 870 { 871 struct mmc_card *card; 872 int err; 873 u32 cid[4]; 874 u32 rocr = 0; 875 876 BUG_ON(!host); 877 WARN_ON(!host->claimed); 878 879 err = mmc_sd_get_cid(host, ocr, cid, &rocr); 880 if (err) 881 return err; 882 883 if (oldcard) { 884 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0) 885 return -ENOENT; 886 887 card = oldcard; 888 } else { 889 /* 890 * Allocate card structure. 891 */ 892 card = mmc_alloc_card(host, &sd_type); 893 if (IS_ERR(card)) 894 return PTR_ERR(card); 895 896 card->type = MMC_TYPE_SD; 897 memcpy(card->raw_cid, cid, sizeof(card->raw_cid)); 898 } 899 900 /* 901 * For native busses: get card RCA and quit open drain mode. 902 */ 903 if (!mmc_host_is_spi(host)) { 904 err = mmc_send_relative_addr(host, &card->rca); 905 if (err) 906 return err; 907 908 mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL); 909 } 910 911 if (!oldcard) { 912 err = mmc_sd_get_csd(host, card); 913 if (err) 914 return err; 915 916 mmc_decode_cid(card); 917 } 918 919 /* 920 * Select card, as all following commands rely on that. 921 */ 922 if (!mmc_host_is_spi(host)) { 923 err = mmc_select_card(card); 924 if (err) 925 return err; 926 } 927 928 err = mmc_sd_setup_card(host, card, oldcard != NULL); 929 if (err) 930 goto free_card; 931 932 /* Initialization sequence for UHS-I cards */ 933 if (rocr & SD_ROCR_S18A) { 934 err = mmc_sd_init_uhs_card(card); 935 if (err) 936 goto free_card; 937 938 /* Card is an ultra-high-speed card */ 939 mmc_sd_card_set_uhs(card); 940 941 /* 942 * Since initialization is now complete, enable preset 943 * value registers for UHS-I cards. 944 */ 945 if (host->ops->enable_preset_value) 946 host->ops->enable_preset_value(host, true); 947 } else { 948 /* 949 * Attempt to change to high-speed (if supported) 950 */ 951 err = mmc_sd_switch_hs(card); 952 if (err > 0) 953 mmc_sd_go_highspeed(card); 954 else if (err) 955 goto free_card; 956 957 /* 958 * Set bus speed. 959 */ 960 mmc_set_clock(host, mmc_sd_get_max_clock(card)); 961 962 /* 963 * Switch to wider bus (if supported). 964 */ 965 if ((host->caps & MMC_CAP_4_BIT_DATA) && 966 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) { 967 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4); 968 if (err) 969 goto free_card; 970 971 mmc_set_bus_width(host, MMC_BUS_WIDTH_4); 972 } 973 } 974 975 host->card = card; 976 return 0; 977 978 free_card: 979 if (!oldcard) 980 mmc_remove_card(card); 981 982 return err; 983 } 984 985 /* 986 * Host is being removed. Free up the current card. 987 */ 988 static void mmc_sd_remove(struct mmc_host *host) 989 { 990 BUG_ON(!host); 991 BUG_ON(!host->card); 992 993 mmc_remove_card(host->card); 994 host->card = NULL; 995 } 996 997 /* 998 * Card detection callback from host. 999 */ 1000 static void mmc_sd_detect(struct mmc_host *host) 1001 { 1002 int err; 1003 1004 BUG_ON(!host); 1005 BUG_ON(!host->card); 1006 1007 mmc_claim_host(host); 1008 1009 /* 1010 * Just check if our card has been removed. 1011 */ 1012 err = mmc_send_status(host->card, NULL); 1013 1014 mmc_release_host(host); 1015 1016 if (err) { 1017 mmc_sd_remove(host); 1018 1019 mmc_claim_host(host); 1020 mmc_detach_bus(host); 1021 mmc_release_host(host); 1022 } 1023 } 1024 1025 /* 1026 * Suspend callback from host. 1027 */ 1028 static int mmc_sd_suspend(struct mmc_host *host) 1029 { 1030 BUG_ON(!host); 1031 BUG_ON(!host->card); 1032 1033 mmc_claim_host(host); 1034 if (!mmc_host_is_spi(host)) 1035 mmc_deselect_cards(host); 1036 host->card->state &= ~MMC_STATE_HIGHSPEED; 1037 mmc_release_host(host); 1038 1039 return 0; 1040 } 1041 1042 /* 1043 * Resume callback from host. 1044 * 1045 * This function tries to determine if the same card is still present 1046 * and, if so, restore all state to it. 1047 */ 1048 static int mmc_sd_resume(struct mmc_host *host) 1049 { 1050 int err; 1051 1052 BUG_ON(!host); 1053 BUG_ON(!host->card); 1054 1055 mmc_claim_host(host); 1056 err = mmc_sd_init_card(host, host->ocr, host->card); 1057 mmc_release_host(host); 1058 1059 return err; 1060 } 1061 1062 static int mmc_sd_power_restore(struct mmc_host *host) 1063 { 1064 int ret; 1065 1066 host->card->state &= ~MMC_STATE_HIGHSPEED; 1067 mmc_claim_host(host); 1068 ret = mmc_sd_init_card(host, host->ocr, host->card); 1069 mmc_release_host(host); 1070 1071 return ret; 1072 } 1073 1074 static const struct mmc_bus_ops mmc_sd_ops = { 1075 .remove = mmc_sd_remove, 1076 .detect = mmc_sd_detect, 1077 .suspend = NULL, 1078 .resume = NULL, 1079 .power_restore = mmc_sd_power_restore, 1080 }; 1081 1082 static const struct mmc_bus_ops mmc_sd_ops_unsafe = { 1083 .remove = mmc_sd_remove, 1084 .detect = mmc_sd_detect, 1085 .suspend = mmc_sd_suspend, 1086 .resume = mmc_sd_resume, 1087 .power_restore = mmc_sd_power_restore, 1088 }; 1089 1090 static void mmc_sd_attach_bus_ops(struct mmc_host *host) 1091 { 1092 const struct mmc_bus_ops *bus_ops; 1093 1094 if (!mmc_card_is_removable(host)) 1095 bus_ops = &mmc_sd_ops_unsafe; 1096 else 1097 bus_ops = &mmc_sd_ops; 1098 mmc_attach_bus(host, bus_ops); 1099 } 1100 1101 /* 1102 * Starting point for SD card init. 1103 */ 1104 int mmc_attach_sd(struct mmc_host *host) 1105 { 1106 int err; 1107 u32 ocr; 1108 1109 BUG_ON(!host); 1110 WARN_ON(!host->claimed); 1111 1112 /* Make sure we are at 3.3V signalling voltage */ 1113 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_330, false); 1114 if (err) 1115 return err; 1116 1117 /* Disable preset value enable if already set since last time */ 1118 if (host->ops->enable_preset_value) 1119 host->ops->enable_preset_value(host, false); 1120 1121 err = mmc_send_app_op_cond(host, 0, &ocr); 1122 if (err) 1123 return err; 1124 1125 mmc_sd_attach_bus_ops(host); 1126 if (host->ocr_avail_sd) 1127 host->ocr_avail = host->ocr_avail_sd; 1128 1129 /* 1130 * We need to get OCR a different way for SPI. 1131 */ 1132 if (mmc_host_is_spi(host)) { 1133 mmc_go_idle(host); 1134 1135 err = mmc_spi_read_ocr(host, 0, &ocr); 1136 if (err) 1137 goto err; 1138 } 1139 1140 /* 1141 * Sanity check the voltages that the card claims to 1142 * support. 1143 */ 1144 if (ocr & 0x7F) { 1145 printk(KERN_WARNING "%s: card claims to support voltages " 1146 "below the defined range. These will be ignored.\n", 1147 mmc_hostname(host)); 1148 ocr &= ~0x7F; 1149 } 1150 1151 if ((ocr & MMC_VDD_165_195) && 1152 !(host->ocr_avail_sd & MMC_VDD_165_195)) { 1153 printk(KERN_WARNING "%s: SD card claims to support the " 1154 "incompletely defined 'low voltage range'. This " 1155 "will be ignored.\n", mmc_hostname(host)); 1156 ocr &= ~MMC_VDD_165_195; 1157 } 1158 1159 host->ocr = mmc_select_voltage(host, ocr); 1160 1161 /* 1162 * Can we support the voltage(s) of the card(s)? 1163 */ 1164 if (!host->ocr) { 1165 err = -EINVAL; 1166 goto err; 1167 } 1168 1169 /* 1170 * Detect and init the card. 1171 */ 1172 err = mmc_sd_init_card(host, host->ocr, NULL); 1173 if (err) 1174 goto err; 1175 1176 mmc_release_host(host); 1177 err = mmc_add_card(host->card); 1178 mmc_claim_host(host); 1179 if (err) 1180 goto remove_card; 1181 1182 return 0; 1183 1184 remove_card: 1185 mmc_release_host(host); 1186 mmc_remove_card(host->card); 1187 host->card = NULL; 1188 mmc_claim_host(host); 1189 err: 1190 mmc_detach_bus(host); 1191 1192 printk(KERN_ERR "%s: error %d whilst initialising SD card\n", 1193 mmc_hostname(host), err); 1194 1195 return err; 1196 } 1197 1198