| /* |
| * linux/drivers/mmc/core/sd.c |
| * |
| * Copyright (C) 2003-2004 Russell King, All Rights Reserved. |
| * SD support Copyright (C) 2004 Ian Molton, All Rights Reserved. |
| * Copyright (C) 2005-2007 Pierre Ossman, All Rights Reserved. |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 as |
| * published by the Free Software Foundation. |
| */ |
| |
| #include <linux/err.h> |
| #include <linux/slab.h> |
| #include <linux/stat.h> |
| |
| #include <linux/mmc/host.h> |
| #include <linux/mmc/card.h> |
| #include <linux/mmc/mmc.h> |
| #include <linux/mmc/sd.h> |
| #include <linux/pm_runtime.h> |
| |
| #include "core.h" |
| #include "bus.h" |
| #include "mmc_ops.h" |
| #include "sd.h" |
| #include "sd_ops.h" |
| |
| static const unsigned int tran_exp[] = { |
| 10000, 100000, 1000000, 10000000, |
| 0, 0, 0, 0 |
| }; |
| |
| static const unsigned char tran_mant[] = { |
| 0, 10, 12, 13, 15, 20, 25, 30, |
| 35, 40, 45, 50, 55, 60, 70, 80, |
| }; |
| |
| static const unsigned int tacc_exp[] = { |
| 1, 10, 100, 1000, 10000, 100000, 1000000, 10000000, |
| }; |
| |
| static const unsigned int tacc_mant[] = { |
| 0, 10, 12, 13, 15, 20, 25, 30, |
| 35, 40, 45, 50, 55, 60, 70, 80, |
| }; |
| |
| #define UNSTUFF_BITS(resp,start,size) \ |
| ({ \ |
| const int __size = size; \ |
| const u32 __mask = (__size < 32 ? 1 << __size : 0) - 1; \ |
| const int __off = 3 - ((start) / 32); \ |
| const int __shft = (start) & 31; \ |
| u32 __res; \ |
| \ |
| __res = resp[__off] >> __shft; \ |
| if (__size + __shft > 32) \ |
| __res |= resp[__off-1] << ((32 - __shft) % 32); \ |
| __res & __mask; \ |
| }) |
| |
| /* |
| * Given the decoded CSD structure, decode the raw CID to our CID structure. |
| */ |
| void mmc_decode_cid(struct mmc_card *card) |
| { |
| u32 *resp = card->raw_cid; |
| |
| memset(&card->cid, 0, sizeof(struct mmc_cid)); |
| |
| /* |
| * SD doesn't currently have a version field so we will |
| * have to assume we can parse this. |
| */ |
| card->cid.manfid = UNSTUFF_BITS(resp, 120, 8); |
| card->cid.oemid = UNSTUFF_BITS(resp, 104, 16); |
| card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8); |
| card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8); |
| card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8); |
| card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8); |
| card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8); |
| card->cid.hwrev = UNSTUFF_BITS(resp, 60, 4); |
| card->cid.fwrev = UNSTUFF_BITS(resp, 56, 4); |
| card->cid.serial = UNSTUFF_BITS(resp, 24, 32); |
| card->cid.year = UNSTUFF_BITS(resp, 12, 8); |
| card->cid.month = UNSTUFF_BITS(resp, 8, 4); |
| |
| card->cid.year += 2000; /* SD cards year offset */ |
| } |
| |
| /* |
| * Given a 128-bit response, decode to our card CSD structure. |
| */ |
| static int mmc_decode_csd(struct mmc_card *card) |
| { |
| struct mmc_csd *csd = &card->csd; |
| unsigned int e, m, csd_struct; |
| u32 *resp = card->raw_csd; |
| |
| csd_struct = UNSTUFF_BITS(resp, 126, 2); |
| |
| switch (csd_struct) { |
| case 0: |
| m = UNSTUFF_BITS(resp, 115, 4); |
| e = UNSTUFF_BITS(resp, 112, 3); |
| csd->tacc_ns = (tacc_exp[e] * tacc_mant[m] + 9) / 10; |
| csd->tacc_clks = UNSTUFF_BITS(resp, 104, 8) * 100; |
| |
| m = UNSTUFF_BITS(resp, 99, 4); |
| e = UNSTUFF_BITS(resp, 96, 3); |
| csd->max_dtr = tran_exp[e] * tran_mant[m]; |
| csd->cmdclass = UNSTUFF_BITS(resp, 84, 12); |
| |
| e = UNSTUFF_BITS(resp, 47, 3); |
| m = UNSTUFF_BITS(resp, 62, 12); |
| csd->capacity = (1 + m) << (e + 2); |
| |
| csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4); |
| csd->read_partial = UNSTUFF_BITS(resp, 79, 1); |
| csd->write_misalign = UNSTUFF_BITS(resp, 78, 1); |
| csd->read_misalign = UNSTUFF_BITS(resp, 77, 1); |
| csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3); |
| csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4); |
| csd->write_partial = UNSTUFF_BITS(resp, 21, 1); |
| |
| if (UNSTUFF_BITS(resp, 46, 1)) { |
| csd->erase_size = 1; |
| } else if (csd->write_blkbits >= 9) { |
| csd->erase_size = UNSTUFF_BITS(resp, 39, 7) + 1; |
| csd->erase_size <<= csd->write_blkbits - 9; |
| } |
| break; |
| case 1: |
| /* |
| * This is a block-addressed SDHC or SDXC card. Most |
| * interesting fields are unused and have fixed |
| * values. To avoid getting tripped by buggy cards, |
| * we assume those fixed values ourselves. |
| */ |
| mmc_card_set_blockaddr(card); |
| |
| csd->tacc_ns = 0; /* Unused */ |
| csd->tacc_clks = 0; /* Unused */ |
| |
| m = UNSTUFF_BITS(resp, 99, 4); |
| e = UNSTUFF_BITS(resp, 96, 3); |
| csd->max_dtr = tran_exp[e] * tran_mant[m]; |
| csd->cmdclass = UNSTUFF_BITS(resp, 84, 12); |
| csd->c_size = UNSTUFF_BITS(resp, 48, 22); |
| |
| /* SDXC cards have a minimum C_SIZE of 0x00FFFF */ |
| if (csd->c_size >= 0xFFFF) |
| mmc_card_set_ext_capacity(card); |
| |
| m = UNSTUFF_BITS(resp, 48, 22); |
| csd->capacity = (1 + m) << 10; |
| |
| csd->read_blkbits = 9; |
| csd->read_partial = 0; |
| csd->write_misalign = 0; |
| csd->read_misalign = 0; |
| csd->r2w_factor = 4; /* Unused */ |
| csd->write_blkbits = 9; |
| csd->write_partial = 0; |
| csd->erase_size = 1; |
| break; |
| default: |
| pr_err("%s: unrecognised CSD structure version %d\n", |
| mmc_hostname(card->host), csd_struct); |
| return -EINVAL; |
| } |
| |
| card->erase_size = csd->erase_size; |
| |
| return 0; |
| } |
| |
| /* |
| * Given a 64-bit response, decode to our card SCR structure. |
| */ |
| static int mmc_decode_scr(struct mmc_card *card) |
| { |
| struct sd_scr *scr = &card->scr; |
| unsigned int scr_struct; |
| u32 resp[4]; |
| |
| resp[3] = card->raw_scr[1]; |
| resp[2] = card->raw_scr[0]; |
| |
| scr_struct = UNSTUFF_BITS(resp, 60, 4); |
| if (scr_struct != 0) { |
| pr_err("%s: unrecognised SCR structure version %d\n", |
| mmc_hostname(card->host), scr_struct); |
| return -EINVAL; |
| } |
| |
| scr->sda_vsn = UNSTUFF_BITS(resp, 56, 4); |
| scr->bus_widths = UNSTUFF_BITS(resp, 48, 4); |
| if (scr->sda_vsn == SCR_SPEC_VER_2) |
| /* Check if Physical Layer Spec v3.0 is supported */ |
| scr->sda_spec3 = UNSTUFF_BITS(resp, 47, 1); |
| |
| if (UNSTUFF_BITS(resp, 55, 1)) |
| card->erased_byte = 0xFF; |
| else |
| card->erased_byte = 0x0; |
| |
| if (scr->sda_spec3) |
| scr->cmds = UNSTUFF_BITS(resp, 32, 2); |
| return 0; |
| } |
| |
| /* |
| * Fetch and process SD Status register. |
| */ |
| static int mmc_read_ssr(struct mmc_card *card) |
| { |
| unsigned int au, es, et, eo; |
| int err, i; |
| u32 *ssr; |
| |
| if (!(card->csd.cmdclass & CCC_APP_SPEC)) { |
| pr_warning("%s: card lacks mandatory SD Status " |
| "function.\n", mmc_hostname(card->host)); |
| return 0; |
| } |
| |
| ssr = kmalloc(64, GFP_KERNEL); |
| if (!ssr) |
| return -ENOMEM; |
| |
| err = mmc_app_sd_status(card, ssr); |
| if (err) { |
| pr_warning("%s: problem reading SD Status " |
| "register.\n", mmc_hostname(card->host)); |
| err = 0; |
| goto out; |
| } |
| |
| for (i = 0; i < 16; i++) |
| ssr[i] = be32_to_cpu(ssr[i]); |
| |
| /* |
| * UNSTUFF_BITS only works with four u32s so we have to offset the |
| * bitfield positions accordingly. |
| */ |
| au = UNSTUFF_BITS(ssr, 428 - 384, 4); |
| if (au > 0 || au <= 9) { |
| card->ssr.au = 1 << (au + 4); |
| es = UNSTUFF_BITS(ssr, 408 - 384, 16); |
| et = UNSTUFF_BITS(ssr, 402 - 384, 6); |
| eo = UNSTUFF_BITS(ssr, 400 - 384, 2); |
| if (es && et) { |
| card->ssr.erase_timeout = (et * 1000) / es; |
| card->ssr.erase_offset = eo * 1000; |
| } |
| } else { |
| pr_warning("%s: SD Status: Invalid Allocation Unit " |
| "size.\n", mmc_hostname(card->host)); |
| } |
| out: |
| kfree(ssr); |
| return err; |
| } |
| |
| /* |
| * Fetches and decodes switch information |
| */ |
| static int mmc_read_switch(struct mmc_card *card) |
| { |
| int err; |
| u8 *status; |
| |
| if (card->scr.sda_vsn < SCR_SPEC_VER_1) |
| return 0; |
| |
| if (!(card->csd.cmdclass & CCC_SWITCH)) { |
| pr_warning("%s: card lacks mandatory switch " |
| "function, performance might suffer.\n", |
| mmc_hostname(card->host)); |
| return 0; |
| } |
| |
| err = -EIO; |
| |
| status = kmalloc(64, GFP_KERNEL); |
| if (!status) { |
| pr_err("%s: could not allocate a buffer for " |
| "switch capabilities.\n", |
| mmc_hostname(card->host)); |
| return -ENOMEM; |
| } |
| |
| /* Find out the supported Bus Speed Modes. */ |
| err = mmc_sd_switch(card, 0, 0, 1, status); |
| if (err) { |
| /* |
| * If the host or the card can't do the switch, |
| * fail more gracefully. |
| */ |
| if (err != -EINVAL && err != -ENOSYS && err != -EFAULT) |
| goto out; |
| |
| pr_warning("%s: problem reading Bus Speed modes.\n", |
| mmc_hostname(card->host)); |
| err = 0; |
| |
| goto out; |
| } |
| |
| if (status[13] & SD_MODE_HIGH_SPEED) |
| card->sw_caps.hs_max_dtr = HIGH_SPEED_MAX_DTR; |
| |
| if (card->scr.sda_spec3) { |
| card->sw_caps.sd3_bus_mode = status[13]; |
| |
| /* Find out Driver Strengths supported by the card */ |
| err = mmc_sd_switch(card, 0, 2, 1, status); |
| if (err) { |
| /* |
| * If the host or the card can't do the switch, |
| * fail more gracefully. |
| */ |
| if (err != -EINVAL && err != -ENOSYS && err != -EFAULT) |
| goto out; |
| |
| pr_warning("%s: problem reading " |
| "Driver Strength.\n", |
| mmc_hostname(card->host)); |
| err = 0; |
| |
| goto out; |
| } |
| |
| card->sw_caps.sd3_drv_type = status[9]; |
| |
| /* Find out Current Limits supported by the card */ |
| err = mmc_sd_switch(card, 0, 3, 1, status); |
| if (err) { |
| /* |
| * If the host or the card can't do the switch, |
| * fail more gracefully. |
| */ |
| if (err != -EINVAL && err != -ENOSYS && err != -EFAULT) |
| goto out; |
| |
| pr_warning("%s: problem reading " |
| "Current Limit.\n", |
| mmc_hostname(card->host)); |
| err = 0; |
| |
| goto out; |
| } |
| |
| card->sw_caps.sd3_curr_limit = status[7]; |
| } |
| |
| out: |
| kfree(status); |
| |
| return err; |
| } |
| |
| /* |
| * Test if the card supports high-speed mode and, if so, switch to it. |
| */ |
| int mmc_sd_switch_hs(struct mmc_card *card) |
| { |
| int err; |
| u8 *status; |
| |
| if (card->scr.sda_vsn < SCR_SPEC_VER_1) |
| return 0; |
| |
| if (!(card->csd.cmdclass & CCC_SWITCH)) |
| return 0; |
| |
| if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED)) |
| return 0; |
| |
| if (card->sw_caps.hs_max_dtr == 0) |
| return 0; |
| |
| err = -EIO; |
| |
| status = kmalloc(64, GFP_KERNEL); |
| if (!status) { |
| pr_err("%s: could not allocate a buffer for " |
| "switch capabilities.\n", mmc_hostname(card->host)); |
| return -ENOMEM; |
| } |
| |
| err = mmc_sd_switch(card, 1, 0, 1, status); |
| if (err) |
| goto out; |
| |
| if ((status[16] & 0xF) != 1) { |
| pr_warning("%s: Problem switching card " |
| "into high-speed mode!\n", |
| mmc_hostname(card->host)); |
| err = 0; |
| } else { |
| err = 1; |
| } |
| |
| out: |
| kfree(status); |
| |
| return err; |
| } |
| |
| static int sd_select_driver_type(struct mmc_card *card, u8 *status) |
| { |
| int host_drv_type = SD_DRIVER_TYPE_B; |
| int card_drv_type = SD_DRIVER_TYPE_B; |
| int drive_strength; |
| int err; |
| |
| /* |
| * If the host doesn't support any of the Driver Types A,C or D, |
| * or there is no board specific handler then default Driver |
| * Type B is used. |
| */ |
| if (!(card->host->caps & (MMC_CAP_DRIVER_TYPE_A | MMC_CAP_DRIVER_TYPE_C |
| | MMC_CAP_DRIVER_TYPE_D))) |
| return 0; |
| |
| if (!card->host->ops->select_drive_strength) |
| return 0; |
| |
| if (card->host->caps & MMC_CAP_DRIVER_TYPE_A) |
| host_drv_type |= SD_DRIVER_TYPE_A; |
| |
| if (card->host->caps & MMC_CAP_DRIVER_TYPE_C) |
| host_drv_type |= SD_DRIVER_TYPE_C; |
| |
| if (card->host->caps & MMC_CAP_DRIVER_TYPE_D) |
| host_drv_type |= SD_DRIVER_TYPE_D; |
| |
| if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_A) |
| card_drv_type |= SD_DRIVER_TYPE_A; |
| |
| if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_C) |
| card_drv_type |= SD_DRIVER_TYPE_C; |
| |
| if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_D) |
| card_drv_type |= SD_DRIVER_TYPE_D; |
| |
| /* |
| * The drive strength that the hardware can support |
| * depends on the board design. Pass the appropriate |
| * information and let the hardware specific code |
| * return what is possible given the options |
| */ |
| mmc_host_clk_hold(card->host); |
| drive_strength = card->host->ops->select_drive_strength( |
| card->sw_caps.uhs_max_dtr, |
| host_drv_type, card_drv_type); |
| mmc_host_clk_release(card->host); |
| |
| err = mmc_sd_switch(card, 1, 2, drive_strength, status); |
| if (err) |
| return err; |
| |
| if ((status[15] & 0xF) != drive_strength) { |
| pr_warning("%s: Problem setting drive strength!\n", |
| mmc_hostname(card->host)); |
| return 0; |
| } |
| |
| mmc_set_driver_type(card->host, drive_strength); |
| |
| return 0; |
| } |
| |
| static void sd_update_bus_speed_mode(struct mmc_card *card) |
| { |
| /* |
| * If the host doesn't support any of the UHS-I modes, fallback on |
| * default speed. |
| */ |
| if (!(card->host->caps & (MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25 | |
| MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR104 | MMC_CAP_UHS_DDR50))) { |
| card->sd_bus_speed = 0; |
| return; |
| } |
| |
| if ((card->host->caps & MMC_CAP_UHS_SDR104) && |
| (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) { |
| card->sd_bus_speed = UHS_SDR104_BUS_SPEED; |
| } else if ((card->host->caps & MMC_CAP_UHS_DDR50) && |
| (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) { |
| card->sd_bus_speed = UHS_DDR50_BUS_SPEED; |
| } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 | |
| MMC_CAP_UHS_SDR50)) && (card->sw_caps.sd3_bus_mode & |
| SD_MODE_UHS_SDR50)) { |
| card->sd_bus_speed = UHS_SDR50_BUS_SPEED; |
| } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 | |
| MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25)) && |
| (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25)) { |
| card->sd_bus_speed = UHS_SDR25_BUS_SPEED; |
| } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 | |
| MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25 | |
| MMC_CAP_UHS_SDR12)) && (card->sw_caps.sd3_bus_mode & |
| SD_MODE_UHS_SDR12)) { |
| card->sd_bus_speed = UHS_SDR12_BUS_SPEED; |
| } |
| } |
| |
| static int sd_set_bus_speed_mode(struct mmc_card *card, u8 *status) |
| { |
| int err; |
| unsigned int timing = 0; |
| |
| switch (card->sd_bus_speed) { |
| case UHS_SDR104_BUS_SPEED: |
| timing = MMC_TIMING_UHS_SDR104; |
| card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR; |
| break; |
| case UHS_DDR50_BUS_SPEED: |
| timing = MMC_TIMING_UHS_DDR50; |
| card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR; |
| break; |
| case UHS_SDR50_BUS_SPEED: |
| timing = MMC_TIMING_UHS_SDR50; |
| card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR; |
| break; |
| case UHS_SDR25_BUS_SPEED: |
| timing = MMC_TIMING_UHS_SDR25; |
| card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR; |
| break; |
| case UHS_SDR12_BUS_SPEED: |
| timing = MMC_TIMING_UHS_SDR12; |
| card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR; |
| break; |
| default: |
| return 0; |
| } |
| |
| err = mmc_sd_switch(card, 1, 0, card->sd_bus_speed, status); |
| if (err) |
| return err; |
| |
| if ((status[16] & 0xF) != card->sd_bus_speed) |
| pr_warning("%s: Problem setting bus speed mode!\n", |
| mmc_hostname(card->host)); |
| else { |
| mmc_set_timing(card->host, timing); |
| mmc_set_clock(card->host, card->sw_caps.uhs_max_dtr); |
| } |
| |
| return 0; |
| } |
| |
| static int sd_set_current_limit(struct mmc_card *card, u8 *status) |
| { |
| int current_limit = 0; |
| int err; |
| |
| /* |
| * Current limit switch is only defined for SDR50, SDR104, and DDR50 |
| * bus speed modes. For other bus speed modes, we set the default |
| * current limit of 200mA. |
| */ |
| if ((card->sd_bus_speed == UHS_SDR50_BUS_SPEED) || |
| (card->sd_bus_speed == UHS_SDR104_BUS_SPEED) || |
| (card->sd_bus_speed == UHS_DDR50_BUS_SPEED)) { |
| if (card->host->caps & MMC_CAP_MAX_CURRENT_800) { |
| if (card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_800) |
| current_limit = SD_SET_CURRENT_LIMIT_800; |
| else if (card->sw_caps.sd3_curr_limit & |
| SD_MAX_CURRENT_600) |
| current_limit = SD_SET_CURRENT_LIMIT_600; |
| else if (card->sw_caps.sd3_curr_limit & |
| SD_MAX_CURRENT_400) |
| current_limit = SD_SET_CURRENT_LIMIT_400; |
| else if (card->sw_caps.sd3_curr_limit & |
| SD_MAX_CURRENT_200) |
| current_limit = SD_SET_CURRENT_LIMIT_200; |
| } else if (card->host->caps & MMC_CAP_MAX_CURRENT_600) { |
| if (card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_600) |
| current_limit = SD_SET_CURRENT_LIMIT_600; |
| else if (card->sw_caps.sd3_curr_limit & |
| SD_MAX_CURRENT_400) |
| current_limit = SD_SET_CURRENT_LIMIT_400; |
| else if (card->sw_caps.sd3_curr_limit & |
| SD_MAX_CURRENT_200) |
| current_limit = SD_SET_CURRENT_LIMIT_200; |
| } else if (card->host->caps & MMC_CAP_MAX_CURRENT_400) { |
| if (card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_400) |
| current_limit = SD_SET_CURRENT_LIMIT_400; |
| else if (card->sw_caps.sd3_curr_limit & |
| SD_MAX_CURRENT_200) |
| current_limit = SD_SET_CURRENT_LIMIT_200; |
| } else if (card->host->caps & MMC_CAP_MAX_CURRENT_200) { |
| if (card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_200) |
| current_limit = SD_SET_CURRENT_LIMIT_200; |
| } |
| } else |
| current_limit = SD_SET_CURRENT_LIMIT_200; |
| |
| err = mmc_sd_switch(card, 1, 3, current_limit, status); |
| if (err) |
| return err; |
| |
| if (((status[15] >> 4) & 0x0F) != current_limit) |
| pr_warning("%s: Problem setting current limit!\n", |
| mmc_hostname(card->host)); |
| |
| return 0; |
| } |
| |
| /** |
| * mmc_sd_change_bus_speed() - Change SD card bus frequency at runtime |
| * @host: pointer to mmc host structure |
| * @freq: pointer to desired frequency to be set |
| * |
| * Change the SD card bus frequency at runtime after the card is |
| * initialized. Callers are expected to make sure of the card's |
| * state (DATA/RCV/TRANSFER) beforing changing the frequency at runtime. |
| * |
| * If the frequency to change is greater than max. supported by card, |
| * *freq is changed to max. supported by card and if it is less than min. |
| * supported by host, *freq is changed to min. supported by host. |
| */ |
| static int mmc_sd_change_bus_speed(struct mmc_host *host, unsigned long *freq) |
| { |
| int err = 0; |
| struct mmc_card *card; |
| |
| mmc_claim_host(host); |
| /* |
| * Assign card pointer after claiming host to avoid race |
| * conditions that may arise during removal of the card. |
| */ |
| card = host->card; |
| |
| /* sanity checks */ |
| if (!card || !freq) { |
| err = -EINVAL; |
| goto out; |
| } |
| |
| if (mmc_card_uhs(card)) { |
| if (*freq > card->sw_caps.uhs_max_dtr) |
| *freq = card->sw_caps.uhs_max_dtr; |
| } else { |
| if (*freq > mmc_sd_get_max_clock(card)) |
| *freq = mmc_sd_get_max_clock(card); |
| } |
| |
| if (*freq < host->f_min) |
| *freq = host->f_min; |
| |
| mmc_set_clock(host, (unsigned int) (*freq)); |
| |
| if (!mmc_host_is_spi(card->host) && mmc_sd_card_uhs(card) |
| && card->host->ops->execute_tuning) { |
| /* |
| * We try to probe host driver for tuning for any |
| * frequency, it is host driver responsibility to |
| * perform actual tuning only when required. |
| */ |
| mmc_host_clk_hold(card->host); |
| err = card->host->ops->execute_tuning(card->host, |
| MMC_SEND_TUNING_BLOCK); |
| mmc_host_clk_release(card->host); |
| |
| if (err) |
| pr_warn("%s: %s: tuning execution failed %d\n", |
| mmc_hostname(card->host), __func__, err); |
| } |
| |
| out: |
| mmc_release_host(host); |
| return err; |
| } |
| |
| /* |
| * UHS-I specific initialization procedure |
| */ |
| static int mmc_sd_init_uhs_card(struct mmc_card *card) |
| { |
| int err; |
| u8 *status; |
| |
| if (!card->scr.sda_spec3) |
| return 0; |
| |
| if (!(card->csd.cmdclass & CCC_SWITCH)) |
| return 0; |
| |
| status = kmalloc(64, GFP_KERNEL); |
| if (!status) { |
| pr_err("%s: could not allocate a buffer for " |
| "switch capabilities.\n", mmc_hostname(card->host)); |
| return -ENOMEM; |
| } |
| |
| /* Set 4-bit bus width */ |
| if ((card->host->caps & MMC_CAP_4_BIT_DATA) && |
| (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) { |
| err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4); |
| if (err) |
| goto out; |
| |
| mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4); |
| } |
| |
| /* |
| * Select the bus speed mode depending on host |
| * and card capability. |
| */ |
| sd_update_bus_speed_mode(card); |
| |
| /* Set the driver strength for the card */ |
| err = sd_select_driver_type(card, status); |
| if (err) |
| goto out; |
| |
| /* Set current limit for the card */ |
| err = sd_set_current_limit(card, status); |
| if (err) |
| goto out; |
| |
| /* Set bus speed mode of the card */ |
| err = sd_set_bus_speed_mode(card, status); |
| if (err) |
| goto out; |
| |
| /* SPI mode doesn't define CMD19 */ |
| if (!mmc_host_is_spi(card->host) && card->host->ops->execute_tuning) { |
| mmc_host_clk_hold(card->host); |
| err = card->host->ops->execute_tuning(card->host, |
| MMC_SEND_TUNING_BLOCK); |
| mmc_host_clk_release(card->host); |
| } |
| |
| out: |
| kfree(status); |
| |
| return err; |
| } |
| |
| MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1], |
| card->raw_cid[2], card->raw_cid[3]); |
| MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1], |
| card->raw_csd[2], card->raw_csd[3]); |
| MMC_DEV_ATTR(scr, "%08x%08x\n", card->raw_scr[0], card->raw_scr[1]); |
| MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year); |
| MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9); |
| MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9); |
| MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev); |
| MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev); |
| MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid); |
| MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name); |
| MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid); |
| MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial); |
| |
| |
| static struct attribute *sd_std_attrs[] = { |
| &dev_attr_cid.attr, |
| &dev_attr_csd.attr, |
| &dev_attr_scr.attr, |
| &dev_attr_date.attr, |
| &dev_attr_erase_size.attr, |
| &dev_attr_preferred_erase_size.attr, |
| &dev_attr_fwrev.attr, |
| &dev_attr_hwrev.attr, |
| &dev_attr_manfid.attr, |
| &dev_attr_name.attr, |
| &dev_attr_oemid.attr, |
| &dev_attr_serial.attr, |
| NULL, |
| }; |
| |
| static struct attribute_group sd_std_attr_group = { |
| .attrs = sd_std_attrs, |
| }; |
| |
| static const struct attribute_group *sd_attr_groups[] = { |
| &sd_std_attr_group, |
| NULL, |
| }; |
| |
| struct device_type sd_type = { |
| .groups = sd_attr_groups, |
| }; |
| |
| /* |
| * Fetch CID from card. |
| */ |
| int mmc_sd_get_cid(struct mmc_host *host, u32 ocr, u32 *cid, u32 *rocr) |
| { |
| int err; |
| |
| /* |
| * Since we're changing the OCR value, we seem to |
| * need to tell some cards to go back to the idle |
| * state. We wait 1ms to give cards time to |
| * respond. |
| */ |
| mmc_go_idle(host); |
| |
| /* |
| * If SD_SEND_IF_COND indicates an SD 2.0 |
| * compliant card and we should set bit 30 |
| * of the ocr to indicate that we can handle |
| * block-addressed SDHC cards. |
| */ |
| err = mmc_send_if_cond(host, ocr); |
| if (!err) |
| ocr |= SD_OCR_CCS; |
| |
| /* |
| * If the host supports one of UHS-I modes, request the card |
| * to switch to 1.8V signaling level. |
| */ |
| if (host->caps & (MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25 | |
| MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR104 | MMC_CAP_UHS_DDR50)) |
| ocr |= SD_OCR_S18R; |
| |
| /* If the host can supply more than 150mA, XPC should be set to 1. */ |
| if (host->caps & (MMC_CAP_SET_XPC_330 | MMC_CAP_SET_XPC_300 | |
| MMC_CAP_SET_XPC_180)) |
| ocr |= SD_OCR_XPC; |
| |
| try_again: |
| err = mmc_send_app_op_cond(host, ocr, rocr); |
| if (err) |
| return err; |
| |
| /* |
| * In case CCS and S18A in the response is set, start Signal Voltage |
| * Switch procedure. SPI mode doesn't support CMD11. |
| */ |
| if (!mmc_host_is_spi(host) && rocr && |
| ((*rocr & 0x41000000) == 0x41000000)) { |
| err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180, true); |
| if (err) { |
| ocr &= ~SD_OCR_S18R; |
| goto try_again; |
| } |
| } |
| |
| if (mmc_host_is_spi(host)) |
| err = mmc_send_cid(host, cid); |
| else |
| err = mmc_all_send_cid(host, cid); |
| |
| return err; |
| } |
| |
| int mmc_sd_get_csd(struct mmc_host *host, struct mmc_card *card) |
| { |
| int err; |
| |
| /* |
| * Fetch CSD from card. |
| */ |
| err = mmc_send_csd(card, card->raw_csd); |
| if (err) |
| return err; |
| |
| err = mmc_decode_csd(card); |
| if (err) |
| return err; |
| |
| return 0; |
| } |
| |
| int mmc_sd_setup_card(struct mmc_host *host, struct mmc_card *card, |
| bool reinit) |
| { |
| int err; |
| #ifdef CONFIG_MMC_PARANOID_SD_INIT |
| int retries; |
| #endif |
| |
| if (!reinit) { |
| /* |
| * Fetch SCR from card. |
| */ |
| err = mmc_app_send_scr(card, card->raw_scr); |
| if (err) |
| return err; |
| |
| err = mmc_decode_scr(card); |
| if (err) |
| return err; |
| |
| /* |
| * Fetch and process SD Status register. |
| */ |
| err = mmc_read_ssr(card); |
| if (err) |
| return err; |
| |
| /* Erase init depends on CSD and SSR */ |
| mmc_init_erase(card); |
| |
| /* |
| * Fetch switch information from card. |
| */ |
| #ifdef CONFIG_MMC_PARANOID_SD_INIT |
| for (retries = 1; retries <= 3; retries++) { |
| err = mmc_read_switch(card); |
| if (!err) { |
| if (retries > 1) { |
| printk(KERN_WARNING |
| "%s: recovered\n", |
| mmc_hostname(host)); |
| } |
| break; |
| } else { |
| printk(KERN_WARNING |
| "%s: read switch failed (attempt %d)\n", |
| mmc_hostname(host), retries); |
| } |
| } |
| #else |
| err = mmc_read_switch(card); |
| #endif |
| |
| if (err) |
| return err; |
| } |
| |
| /* |
| * For SPI, enable CRC as appropriate. |
| * This CRC enable is located AFTER the reading of the |
| * card registers because some SDHC cards are not able |
| * to provide valid CRCs for non-512-byte blocks. |
| */ |
| if (mmc_host_is_spi(host)) { |
| err = mmc_spi_set_crc(host, use_spi_crc); |
| if (err) |
| return err; |
| } |
| |
| /* |
| * Check if read-only switch is active. |
| */ |
| if (!reinit) { |
| int ro = -1; |
| |
| if (host->ops->get_ro) { |
| mmc_host_clk_hold(card->host); |
| ro = host->ops->get_ro(host); |
| mmc_host_clk_release(card->host); |
| } |
| |
| if (ro < 0) { |
| pr_warning("%s: host does not " |
| "support reading read-only " |
| "switch. assuming write-enable.\n", |
| mmc_hostname(host)); |
| } else if (ro > 0) { |
| mmc_card_set_readonly(card); |
| } |
| } |
| |
| return 0; |
| } |
| |
| unsigned mmc_sd_get_max_clock(struct mmc_card *card) |
| { |
| unsigned max_dtr = (unsigned int)-1; |
| |
| if (mmc_card_highspeed(card)) { |
| if (max_dtr > card->sw_caps.hs_max_dtr) |
| max_dtr = card->sw_caps.hs_max_dtr; |
| } else if (max_dtr > card->csd.max_dtr) { |
| max_dtr = card->csd.max_dtr; |
| } |
| |
| return max_dtr; |
| } |
| |
| void mmc_sd_go_highspeed(struct mmc_card *card) |
| { |
| mmc_card_set_highspeed(card); |
| mmc_set_timing(card->host, MMC_TIMING_SD_HS); |
| } |
| |
| /* |
| * Handle the detection and initialisation of a card. |
| * |
| * In the case of a resume, "oldcard" will contain the card |
| * we're trying to reinitialise. |
| */ |
| static int mmc_sd_init_card(struct mmc_host *host, u32 ocr, |
| struct mmc_card *oldcard) |
| { |
| struct mmc_card *card; |
| int err; |
| u32 cid[4]; |
| u32 rocr = 0; |
| |
| BUG_ON(!host); |
| WARN_ON(!host->claimed); |
| |
| /* The initialization should be done at 3.3 V I/O voltage. */ |
| mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_330, 0); |
| |
| err = mmc_sd_get_cid(host, ocr, cid, &rocr); |
| if (err) |
| return err; |
| |
| if (oldcard) { |
| if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0) |
| return -ENOENT; |
| |
| card = oldcard; |
| } else { |
| /* |
| * Allocate card structure. |
| */ |
| card = mmc_alloc_card(host, &sd_type); |
| if (IS_ERR(card)) |
| return PTR_ERR(card); |
| |
| card->type = MMC_TYPE_SD; |
| memcpy(card->raw_cid, cid, sizeof(card->raw_cid)); |
| } |
| |
| /* |
| * For native busses: get card RCA and quit open drain mode. |
| */ |
| if (!mmc_host_is_spi(host)) { |
| err = mmc_send_relative_addr(host, &card->rca); |
| if (err) |
| return err; |
| } |
| |
| if (!oldcard) { |
| err = mmc_sd_get_csd(host, card); |
| if (err) |
| return err; |
| |
| mmc_decode_cid(card); |
| } |
| |
| /* |
| * Select card, as all following commands rely on that. |
| */ |
| if (!mmc_host_is_spi(host)) { |
| err = mmc_select_card(card); |
| if (err) |
| return err; |
| } |
| |
| err = mmc_sd_setup_card(host, card, oldcard != NULL); |
| if (err) |
| goto free_card; |
| |
| /* Initialization sequence for UHS-I cards */ |
| if (rocr & SD_ROCR_S18A) { |
| err = mmc_sd_init_uhs_card(card); |
| if (err) |
| goto free_card; |
| |
| /* Card is an ultra-high-speed card */ |
| mmc_card_set_uhs(card); |
| |
| /* |
| * Since initialization is now complete, enable preset |
| * value registers for UHS-I cards. |
| */ |
| if (host->ops->enable_preset_value) { |
| mmc_host_clk_hold(card->host); |
| host->ops->enable_preset_value(host, true); |
| mmc_host_clk_release(card->host); |
| } |
| } else { |
| /* |
| * Attempt to change to high-speed (if supported) |
| */ |
| err = mmc_sd_switch_hs(card); |
| if (err > 0) |
| mmc_sd_go_highspeed(card); |
| else if (err) |
| goto free_card; |
| |
| /* |
| * Set bus speed. |
| */ |
| mmc_set_clock(host, mmc_sd_get_max_clock(card)); |
| |
| /* |
| * Switch to wider bus (if supported). |
| */ |
| if ((host->caps & MMC_CAP_4_BIT_DATA) && |
| (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) { |
| err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4); |
| if (err) |
| goto free_card; |
| |
| mmc_set_bus_width(host, MMC_BUS_WIDTH_4); |
| } |
| } |
| |
| host->card = card; |
| return 0; |
| |
| free_card: |
| if (!oldcard) |
| mmc_remove_card(card); |
| |
| return err; |
| } |
| |
| /* |
| * Host is being removed. Free up the current card. |
| */ |
| static void mmc_sd_remove(struct mmc_host *host) |
| { |
| BUG_ON(!host); |
| BUG_ON(!host->card); |
| |
| mmc_remove_card(host->card); |
| |
| mmc_claim_host(host); |
| host->card = NULL; |
| mmc_exit_clk_scaling(host); |
| mmc_release_host(host); |
| } |
| |
| /* |
| * Card detection - card is alive. |
| */ |
| static int mmc_sd_alive(struct mmc_host *host) |
| { |
| return mmc_send_status(host->card, NULL); |
| } |
| |
| /* |
| * Card detection callback from host. |
| */ |
| static void mmc_sd_detect(struct mmc_host *host) |
| { |
| int err = 0; |
| #ifdef CONFIG_MMC_PARANOID_SD_INIT |
| int retries = 5; |
| #endif |
| |
| BUG_ON(!host); |
| BUG_ON(!host->card); |
| |
| mmc_rpm_hold(host, &host->card->dev); |
| mmc_claim_host(host); |
| |
| /* |
| * Just check if our card has been removed. |
| */ |
| #ifdef CONFIG_MMC_PARANOID_SD_INIT |
| while(retries) { |
| err = mmc_send_status(host->card, NULL); |
| if (err) { |
| retries--; |
| udelay(5); |
| continue; |
| } |
| break; |
| } |
| if (!retries) { |
| printk(KERN_ERR "%s(%s): Unable to re-detect card (%d)\n", |
| __func__, mmc_hostname(host), err); |
| err = _mmc_detect_card_removed(host); |
| } |
| #else |
| err = _mmc_detect_card_removed(host); |
| #endif |
| mmc_release_host(host); |
| |
| /* |
| * if detect fails, the device would be removed anyway; |
| * the rpm framework would mark the device state suspended. |
| */ |
| if (!err) |
| mmc_rpm_release(host, &host->card->dev); |
| |
| if (err) { |
| mmc_sd_remove(host); |
| |
| mmc_claim_host(host); |
| mmc_detach_bus(host); |
| mmc_power_off(host); |
| mmc_release_host(host); |
| } |
| } |
| |
| /* |
| * Suspend callback from host. |
| */ |
| static int mmc_sd_suspend(struct mmc_host *host) |
| { |
| BUG_ON(!host); |
| BUG_ON(!host->card); |
| |
| /* |
| * Disable clock scaling before suspend and enable it after resume so |
| * as to avoid clock scaling decisions kicking in during this window. |
| */ |
| mmc_disable_clk_scaling(host); |
| |
| mmc_claim_host(host); |
| if (!mmc_host_is_spi(host)) |
| mmc_deselect_cards(host); |
| host->card->state &= ~MMC_STATE_HIGHSPEED; |
| mmc_release_host(host); |
| |
| return 0; |
| } |
| |
| /* |
| * Resume callback from host. |
| * |
| * This function tries to determine if the same card is still present |
| * and, if so, restore all state to it. |
| */ |
| static int mmc_sd_resume(struct mmc_host *host) |
| { |
| int err; |
| #ifdef CONFIG_MMC_PARANOID_SD_INIT |
| int retries; |
| #endif |
| |
| BUG_ON(!host); |
| BUG_ON(!host->card); |
| |
| mmc_claim_host(host); |
| #ifdef CONFIG_MMC_PARANOID_SD_INIT |
| retries = 5; |
| while (retries) { |
| err = mmc_sd_init_card(host, host->ocr, host->card); |
| |
| if (err) { |
| printk(KERN_ERR "%s: Re-init card rc = %d (retries = %d)\n", |
| mmc_hostname(host), err, retries); |
| retries--; |
| mmc_power_off(host); |
| usleep_range(5000, 5500); |
| mmc_power_up(host); |
| mmc_select_voltage(host, host->ocr); |
| continue; |
| } |
| break; |
| } |
| #else |
| err = mmc_sd_init_card(host, host->ocr, host->card); |
| #endif |
| mmc_release_host(host); |
| |
| /* |
| * We have done full initialization of the card, |
| * reset the clk scale stats and current frequency. |
| */ |
| if (mmc_can_scale_clk(host)) |
| mmc_init_clk_scaling(host); |
| |
| return err; |
| } |
| |
| static int mmc_sd_power_restore(struct mmc_host *host) |
| { |
| int ret; |
| |
| /* Disable clk scaling to avoid switching frequencies intermittently */ |
| mmc_disable_clk_scaling(host); |
| |
| host->card->state &= ~MMC_STATE_HIGHSPEED; |
| mmc_claim_host(host); |
| ret = mmc_sd_init_card(host, host->ocr, host->card); |
| mmc_release_host(host); |
| |
| if (mmc_can_scale_clk(host)) |
| mmc_init_clk_scaling(host); |
| |
| return ret; |
| } |
| |
| static const struct mmc_bus_ops mmc_sd_ops = { |
| .remove = mmc_sd_remove, |
| .detect = mmc_sd_detect, |
| .suspend = NULL, |
| .resume = NULL, |
| .power_restore = mmc_sd_power_restore, |
| .alive = mmc_sd_alive, |
| .change_bus_speed = mmc_sd_change_bus_speed, |
| }; |
| |
| static const struct mmc_bus_ops mmc_sd_ops_unsafe = { |
| .remove = mmc_sd_remove, |
| .detect = mmc_sd_detect, |
| .suspend = mmc_sd_suspend, |
| .resume = mmc_sd_resume, |
| .power_restore = mmc_sd_power_restore, |
| .alive = mmc_sd_alive, |
| .change_bus_speed = mmc_sd_change_bus_speed, |
| }; |
| |
| static void mmc_sd_attach_bus_ops(struct mmc_host *host) |
| { |
| const struct mmc_bus_ops *bus_ops; |
| |
| if (!mmc_card_is_removable(host)) |
| bus_ops = &mmc_sd_ops_unsafe; |
| else |
| bus_ops = &mmc_sd_ops; |
| mmc_attach_bus(host, bus_ops); |
| } |
| |
| /* |
| * Starting point for SD card init. |
| */ |
| int mmc_attach_sd(struct mmc_host *host) |
| { |
| int err; |
| u32 ocr; |
| #ifdef CONFIG_MMC_PARANOID_SD_INIT |
| int retries; |
| #endif |
| |
| BUG_ON(!host); |
| WARN_ON(!host->claimed); |
| |
| /* Disable preset value enable if already set since last time */ |
| if (host->ops->enable_preset_value) { |
| mmc_host_clk_hold(host); |
| host->ops->enable_preset_value(host, false); |
| mmc_host_clk_release(host); |
| } |
| |
| err = mmc_send_app_op_cond(host, 0, &ocr); |
| if (err) |
| return err; |
| |
| mmc_sd_attach_bus_ops(host); |
| if (host->ocr_avail_sd) |
| host->ocr_avail = host->ocr_avail_sd; |
| |
| /* |
| * We need to get OCR a different way for SPI. |
| */ |
| if (mmc_host_is_spi(host)) { |
| mmc_go_idle(host); |
| |
| err = mmc_spi_read_ocr(host, 0, &ocr); |
| if (err) |
| goto err; |
| } |
| |
| /* |
| * Sanity check the voltages that the card claims to |
| * support. |
| */ |
| if (ocr & 0x7F) { |
| pr_warning("%s: card claims to support voltages " |
| "below the defined range. These will be ignored.\n", |
| mmc_hostname(host)); |
| ocr &= ~0x7F; |
| } |
| |
| if ((ocr & MMC_VDD_165_195) && |
| !(host->ocr_avail_sd & MMC_VDD_165_195)) { |
| pr_warning("%s: SD card claims to support the " |
| "incompletely defined 'low voltage range'. This " |
| "will be ignored.\n", mmc_hostname(host)); |
| ocr &= ~MMC_VDD_165_195; |
| } |
| |
| host->ocr = mmc_select_voltage(host, ocr); |
| |
| /* |
| * Can we support the voltage(s) of the card(s)? |
| */ |
| if (!host->ocr) { |
| err = -EINVAL; |
| goto err; |
| } |
| |
| /* |
| * Detect and init the card. |
| */ |
| #ifdef CONFIG_MMC_PARANOID_SD_INIT |
| retries = 5; |
| while (retries) { |
| err = mmc_sd_init_card(host, host->ocr, NULL); |
| if (err) { |
| retries--; |
| mmc_power_off(host); |
| usleep_range(5000, 5500); |
| mmc_power_up(host); |
| mmc_select_voltage(host, host->ocr); |
| continue; |
| } |
| break; |
| } |
| |
| if (!retries) { |
| printk(KERN_ERR "%s: mmc_sd_init_card() failure (err = %d)\n", |
| mmc_hostname(host), err); |
| goto err; |
| } |
| #else |
| err = mmc_sd_init_card(host, host->ocr, NULL); |
| if (err) |
| goto err; |
| #endif |
| |
| mmc_release_host(host); |
| err = mmc_add_card(host->card); |
| mmc_claim_host(host); |
| if (err) |
| goto remove_card; |
| |
| mmc_init_clk_scaling(host); |
| |
| return 0; |
| |
| remove_card: |
| mmc_release_host(host); |
| mmc_remove_card(host->card); |
| host->card = NULL; |
| mmc_claim_host(host); |
| err: |
| mmc_detach_bus(host); |
| |
| pr_err("%s: error %d whilst initialising SD card\n", |
| mmc_hostname(host), err); |
| |
| return err; |
| } |
| |