| /* |
| * linux/drivers/mmc/sdio.c |
| * |
| * Copyright 2006-2007 Pierre Ossman |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or (at |
| * your option) any later version. |
| */ |
| |
| #include <linux/err.h> |
| #include <linux/pm_runtime.h> |
| |
| #include <linux/mmc/host.h> |
| #include <linux/mmc/card.h> |
| #include <linux/mmc/mmc.h> |
| #include <linux/mmc/sdio.h> |
| #include <linux/mmc/sdio_func.h> |
| #include <linux/mmc/sdio_ids.h> |
| |
| #include "core.h" |
| #include "card.h" |
| #include "host.h" |
| #include "bus.h" |
| #include "quirks.h" |
| #include "sd.h" |
| #include "sdio_bus.h" |
| #include "mmc_ops.h" |
| #include "sd_ops.h" |
| #include "sdio_ops.h" |
| #include "sdio_cis.h" |
| |
| static int sdio_read_fbr(struct sdio_func *func) |
| { |
| int ret; |
| unsigned char data; |
| |
| if (mmc_card_nonstd_func_interface(func->card)) { |
| func->class = SDIO_CLASS_NONE; |
| return 0; |
| } |
| |
| ret = mmc_io_rw_direct(func->card, 0, 0, |
| SDIO_FBR_BASE(func->num) + SDIO_FBR_STD_IF, 0, &data); |
| if (ret) |
| goto out; |
| |
| data &= 0x0f; |
| |
| if (data == 0x0f) { |
| ret = mmc_io_rw_direct(func->card, 0, 0, |
| SDIO_FBR_BASE(func->num) + SDIO_FBR_STD_IF_EXT, 0, &data); |
| if (ret) |
| goto out; |
| } |
| |
| func->class = data; |
| |
| out: |
| return ret; |
| } |
| |
| static int sdio_init_func(struct mmc_card *card, unsigned int fn) |
| { |
| int ret; |
| struct sdio_func *func; |
| |
| if (WARN_ON(fn > SDIO_MAX_FUNCS)) |
| return -EINVAL; |
| |
| func = sdio_alloc_func(card); |
| if (IS_ERR(func)) |
| return PTR_ERR(func); |
| |
| func->num = fn; |
| |
| if (!(card->quirks & MMC_QUIRK_NONSTD_SDIO)) { |
| ret = sdio_read_fbr(func); |
| if (ret) |
| goto fail; |
| |
| ret = sdio_read_func_cis(func); |
| if (ret) |
| goto fail; |
| } else { |
| func->vendor = func->card->cis.vendor; |
| func->device = func->card->cis.device; |
| func->max_blksize = func->card->cis.blksize; |
| } |
| |
| card->sdio_func[fn - 1] = func; |
| |
| return 0; |
| |
| fail: |
| /* |
| * It is okay to remove the function here even though we hold |
| * the host lock as we haven't registered the device yet. |
| */ |
| sdio_remove_func(func); |
| return ret; |
| } |
| |
| static int sdio_read_cccr(struct mmc_card *card, u32 ocr) |
| { |
| int ret; |
| int cccr_vsn; |
| int uhs = ocr & R4_18V_PRESENT; |
| unsigned char data; |
| unsigned char speed; |
| |
| ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_CCCR, 0, &data); |
| if (ret) |
| goto out; |
| |
| cccr_vsn = data & 0x0f; |
| |
| if (cccr_vsn > SDIO_CCCR_REV_3_00) { |
| pr_err("%s: unrecognised CCCR structure version %d\n", |
| mmc_hostname(card->host), cccr_vsn); |
| return -EINVAL; |
| } |
| |
| card->cccr.sdio_vsn = (data & 0xf0) >> 4; |
| |
| ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_CAPS, 0, &data); |
| if (ret) |
| goto out; |
| |
| if (data & SDIO_CCCR_CAP_SMB) |
| card->cccr.multi_block = 1; |
| if (data & SDIO_CCCR_CAP_LSC) |
| card->cccr.low_speed = 1; |
| if (data & SDIO_CCCR_CAP_4BLS) |
| card->cccr.wide_bus = 1; |
| |
| if (cccr_vsn >= SDIO_CCCR_REV_1_10) { |
| ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_POWER, 0, &data); |
| if (ret) |
| goto out; |
| |
| if (data & SDIO_POWER_SMPC) |
| card->cccr.high_power = 1; |
| } |
| |
| if (cccr_vsn >= SDIO_CCCR_REV_1_20) { |
| ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed); |
| if (ret) |
| goto out; |
| |
| card->scr.sda_spec3 = 0; |
| card->sw_caps.sd3_bus_mode = 0; |
| card->sw_caps.sd3_drv_type = 0; |
| if (cccr_vsn >= SDIO_CCCR_REV_3_00 && uhs) { |
| card->scr.sda_spec3 = 1; |
| ret = mmc_io_rw_direct(card, 0, 0, |
| SDIO_CCCR_UHS, 0, &data); |
| if (ret) |
| goto out; |
| |
| if (mmc_host_uhs(card->host)) { |
| if (data & SDIO_UHS_DDR50) |
| card->sw_caps.sd3_bus_mode |
| |= SD_MODE_UHS_DDR50; |
| |
| if (data & SDIO_UHS_SDR50) |
| card->sw_caps.sd3_bus_mode |
| |= SD_MODE_UHS_SDR50; |
| |
| if (data & SDIO_UHS_SDR104) |
| card->sw_caps.sd3_bus_mode |
| |= SD_MODE_UHS_SDR104; |
| } |
| |
| ret = mmc_io_rw_direct(card, 0, 0, |
| SDIO_CCCR_DRIVE_STRENGTH, 0, &data); |
| if (ret) |
| goto out; |
| |
| if (data & SDIO_DRIVE_SDTA) |
| card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_A; |
| if (data & SDIO_DRIVE_SDTC) |
| card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_C; |
| if (data & SDIO_DRIVE_SDTD) |
| card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_D; |
| } |
| |
| /* if no uhs mode ensure we check for high speed */ |
| if (!card->sw_caps.sd3_bus_mode) { |
| if (speed & SDIO_SPEED_SHS) { |
| card->cccr.high_speed = 1; |
| card->sw_caps.hs_max_dtr = 50000000; |
| } else { |
| card->cccr.high_speed = 0; |
| card->sw_caps.hs_max_dtr = 25000000; |
| } |
| } |
| } |
| |
| out: |
| return ret; |
| } |
| |
| static int sdio_enable_wide(struct mmc_card *card) |
| { |
| int ret; |
| u8 ctrl; |
| |
| if (!(card->host->caps & MMC_CAP_4_BIT_DATA)) |
| return 0; |
| |
| if (card->cccr.low_speed && !card->cccr.wide_bus) |
| return 0; |
| |
| ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl); |
| if (ret) |
| return ret; |
| |
| if ((ctrl & SDIO_BUS_WIDTH_MASK) == SDIO_BUS_WIDTH_RESERVED) |
| pr_warn("%s: SDIO_CCCR_IF is invalid: 0x%02x\n", |
| mmc_hostname(card->host), ctrl); |
| |
| /* set as 4-bit bus width */ |
| ctrl &= ~SDIO_BUS_WIDTH_MASK; |
| ctrl |= SDIO_BUS_WIDTH_4BIT; |
| |
| ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL); |
| if (ret) |
| return ret; |
| |
| return 1; |
| } |
| |
| /* |
| * If desired, disconnect the pull-up resistor on CD/DAT[3] (pin 1) |
| * of the card. This may be required on certain setups of boards, |
| * controllers and embedded sdio device which do not need the card's |
| * pull-up. As a result, card detection is disabled and power is saved. |
| */ |
| static int sdio_disable_cd(struct mmc_card *card) |
| { |
| int ret; |
| u8 ctrl; |
| |
| if (!mmc_card_disable_cd(card)) |
| return 0; |
| |
| ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl); |
| if (ret) |
| return ret; |
| |
| ctrl |= SDIO_BUS_CD_DISABLE; |
| |
| return mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL); |
| } |
| |
| /* |
| * Devices that remain active during a system suspend are |
| * put back into 1-bit mode. |
| */ |
| static int sdio_disable_wide(struct mmc_card *card) |
| { |
| int ret; |
| u8 ctrl; |
| |
| if (!(card->host->caps & MMC_CAP_4_BIT_DATA)) |
| return 0; |
| |
| if (card->cccr.low_speed && !card->cccr.wide_bus) |
| return 0; |
| |
| ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl); |
| if (ret) |
| return ret; |
| |
| if (!(ctrl & SDIO_BUS_WIDTH_4BIT)) |
| return 0; |
| |
| ctrl &= ~SDIO_BUS_WIDTH_4BIT; |
| ctrl |= SDIO_BUS_ASYNC_INT; |
| |
| ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL); |
| if (ret) |
| return ret; |
| |
| mmc_set_bus_width(card->host, MMC_BUS_WIDTH_1); |
| |
| return 0; |
| } |
| |
| |
| static int sdio_enable_4bit_bus(struct mmc_card *card) |
| { |
| int err; |
| |
| if (card->type == MMC_TYPE_SDIO) |
| err = sdio_enable_wide(card); |
| else 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) |
| return err; |
| err = sdio_enable_wide(card); |
| if (err <= 0) |
| mmc_app_set_bus_width(card, MMC_BUS_WIDTH_1); |
| } else |
| return 0; |
| |
| if (err > 0) { |
| mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4); |
| err = 0; |
| } |
| |
| return err; |
| } |
| |
| |
| /* |
| * Test if the card supports high-speed mode and, if so, switch to it. |
| */ |
| static int mmc_sdio_switch_hs(struct mmc_card *card, int enable) |
| { |
| int ret; |
| u8 speed; |
| |
| if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED)) |
| return 0; |
| |
| if (!card->cccr.high_speed) |
| return 0; |
| |
| ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed); |
| if (ret) |
| return ret; |
| |
| if (enable) |
| speed |= SDIO_SPEED_EHS; |
| else |
| speed &= ~SDIO_SPEED_EHS; |
| |
| ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_SPEED, speed, NULL); |
| if (ret) |
| return ret; |
| |
| return 1; |
| } |
| |
| /* |
| * Enable SDIO/combo card's high-speed mode. Return 0/1 if [not]supported. |
| */ |
| static int sdio_enable_hs(struct mmc_card *card) |
| { |
| int ret; |
| |
| ret = mmc_sdio_switch_hs(card, true); |
| if (ret <= 0 || card->type == MMC_TYPE_SDIO) |
| return ret; |
| |
| ret = mmc_sd_switch_hs(card); |
| if (ret <= 0) |
| mmc_sdio_switch_hs(card, false); |
| |
| return ret; |
| } |
| |
| static unsigned mmc_sdio_get_max_clock(struct mmc_card *card) |
| { |
| unsigned max_dtr; |
| |
| if (mmc_card_hs(card)) { |
| /* |
| * The SDIO specification doesn't mention how |
| * the CIS transfer speed register relates to |
| * high-speed, but it seems that 50 MHz is |
| * mandatory. |
| */ |
| max_dtr = 50000000; |
| } else { |
| max_dtr = card->cis.max_dtr; |
| } |
| |
| if (card->type == MMC_TYPE_SD_COMBO) |
| max_dtr = min(max_dtr, mmc_sd_get_max_clock(card)); |
| |
| return max_dtr; |
| } |
| |
| static unsigned char host_drive_to_sdio_drive(int host_strength) |
| { |
| switch (host_strength) { |
| case MMC_SET_DRIVER_TYPE_A: |
| return SDIO_DTSx_SET_TYPE_A; |
| case MMC_SET_DRIVER_TYPE_B: |
| return SDIO_DTSx_SET_TYPE_B; |
| case MMC_SET_DRIVER_TYPE_C: |
| return SDIO_DTSx_SET_TYPE_C; |
| case MMC_SET_DRIVER_TYPE_D: |
| return SDIO_DTSx_SET_TYPE_D; |
| default: |
| return SDIO_DTSx_SET_TYPE_B; |
| } |
| } |
| |
| static void sdio_select_driver_type(struct mmc_card *card) |
| { |
| int card_drv_type, drive_strength, drv_type; |
| unsigned char card_strength; |
| int err; |
| |
| card->drive_strength = 0; |
| |
| card_drv_type = card->sw_caps.sd3_drv_type | SD_DRIVER_TYPE_B; |
| |
| drive_strength = mmc_select_drive_strength(card, |
| card->sw_caps.uhs_max_dtr, |
| card_drv_type, &drv_type); |
| |
| if (drive_strength) { |
| /* if error just use default for drive strength B */ |
| err = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_DRIVE_STRENGTH, 0, |
| &card_strength); |
| if (err) |
| return; |
| |
| card_strength &= ~(SDIO_DRIVE_DTSx_MASK<<SDIO_DRIVE_DTSx_SHIFT); |
| card_strength |= host_drive_to_sdio_drive(drive_strength); |
| |
| /* if error default to drive strength B */ |
| err = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_DRIVE_STRENGTH, |
| card_strength, NULL); |
| if (err) |
| return; |
| card->drive_strength = drive_strength; |
| } |
| |
| if (drv_type) |
| mmc_set_driver_type(card->host, drv_type); |
| } |
| |
| |
| static int sdio_set_bus_speed_mode(struct mmc_card *card) |
| { |
| unsigned int bus_speed, timing; |
| int err; |
| unsigned char speed; |
| unsigned int max_rate; |
| |
| /* |
| * If the host doesn't support any of the UHS-I modes, fallback on |
| * default speed. |
| */ |
| if (!mmc_host_uhs(card->host)) |
| return 0; |
| |
| bus_speed = SDIO_SPEED_SDR12; |
| timing = MMC_TIMING_UHS_SDR12; |
| if ((card->host->caps & MMC_CAP_UHS_SDR104) && |
| (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) { |
| bus_speed = SDIO_SPEED_SDR104; |
| timing = MMC_TIMING_UHS_SDR104; |
| card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR; |
| 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)) { |
| bus_speed = SDIO_SPEED_DDR50; |
| timing = MMC_TIMING_UHS_DDR50; |
| card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR; |
| 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)) { |
| bus_speed = SDIO_SPEED_SDR50; |
| timing = MMC_TIMING_UHS_SDR50; |
| card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR; |
| 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)) { |
| bus_speed = SDIO_SPEED_SDR25; |
| timing = MMC_TIMING_UHS_SDR25; |
| card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR; |
| 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)) { |
| bus_speed = SDIO_SPEED_SDR12; |
| timing = MMC_TIMING_UHS_SDR12; |
| card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR; |
| card->sd_bus_speed = UHS_SDR12_BUS_SPEED; |
| } |
| |
| err = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed); |
| if (err) |
| return err; |
| |
| speed &= ~SDIO_SPEED_BSS_MASK; |
| speed |= bus_speed; |
| err = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_SPEED, speed, NULL); |
| if (err) |
| return err; |
| |
| max_rate = min_not_zero(card->quirk_max_rate, |
| card->sw_caps.uhs_max_dtr); |
| |
| if (bus_speed) { |
| mmc_set_timing(card->host, timing); |
| mmc_set_clock(card->host, max_rate); |
| } |
| |
| return 0; |
| } |
| |
| /* |
| * UHS-I specific initialization procedure |
| */ |
| static int mmc_sdio_init_uhs_card(struct mmc_card *card) |
| { |
| int err; |
| |
| if (!card->scr.sda_spec3) |
| return 0; |
| |
| /* Switch to wider bus */ |
| err = sdio_enable_4bit_bus(card); |
| if (err) |
| goto out; |
| |
| /* Set the driver strength for the card */ |
| sdio_select_driver_type(card); |
| |
| /* Set bus speed mode of the card */ |
| err = sdio_set_bus_speed_mode(card); |
| if (err) |
| goto out; |
| |
| /* |
| * SPI mode doesn't define CMD19 and tuning is only valid for SDR50 and |
| * SDR104 mode SD-cards. Note that tuning is mandatory for SDR104. |
| */ |
| if (!mmc_host_is_spi(card->host) && |
| ((card->host->ios.timing == MMC_TIMING_UHS_SDR50) || |
| (card->host->ios.timing == MMC_TIMING_UHS_SDR104))) |
| err = mmc_execute_tuning(card); |
| out: |
| return err; |
| } |
| |
| static void mmc_sdio_resend_if_cond(struct mmc_host *host, |
| struct mmc_card *card) |
| { |
| sdio_reset(host); |
| mmc_go_idle(host); |
| mmc_send_if_cond(host, host->ocr_avail); |
| mmc_remove_card(card); |
| } |
| |
| /* |
| * 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_sdio_init_card(struct mmc_host *host, u32 ocr, |
| struct mmc_card *oldcard, int powered_resume) |
| { |
| struct mmc_card *card; |
| int err; |
| int retries = 10; |
| u32 rocr = 0; |
| u32 ocr_card = ocr; |
| |
| WARN_ON(!host->claimed); |
| |
| /* to query card if 1.8V signalling is supported */ |
| if (mmc_host_uhs(host)) |
| ocr |= R4_18V_PRESENT; |
| |
| try_again: |
| if (!retries) { |
| pr_warn("%s: Skipping voltage switch\n", mmc_hostname(host)); |
| ocr &= ~R4_18V_PRESENT; |
| } |
| |
| /* |
| * Inform the card of the voltage |
| */ |
| if (!powered_resume) { |
| err = mmc_send_io_op_cond(host, ocr, &rocr); |
| if (err) |
| goto err; |
| } |
| |
| /* |
| * For SPI, enable CRC as appropriate. |
| */ |
| if (mmc_host_is_spi(host)) { |
| err = mmc_spi_set_crc(host, use_spi_crc); |
| if (err) |
| goto err; |
| } |
| |
| /* |
| * Allocate card structure. |
| */ |
| card = mmc_alloc_card(host, NULL); |
| if (IS_ERR(card)) { |
| err = PTR_ERR(card); |
| goto err; |
| } |
| |
| if ((rocr & R4_MEMORY_PRESENT) && |
| mmc_sd_get_cid(host, ocr & rocr, card->raw_cid, NULL) == 0) { |
| card->type = MMC_TYPE_SD_COMBO; |
| |
| if (oldcard && (oldcard->type != MMC_TYPE_SD_COMBO || |
| memcmp(card->raw_cid, oldcard->raw_cid, sizeof(card->raw_cid)) != 0)) { |
| mmc_remove_card(card); |
| return -ENOENT; |
| } |
| } else { |
| card->type = MMC_TYPE_SDIO; |
| |
| if (oldcard && oldcard->type != MMC_TYPE_SDIO) { |
| mmc_remove_card(card); |
| return -ENOENT; |
| } |
| } |
| |
| /* |
| * Call the optional HC's init_card function to handle quirks. |
| */ |
| if (host->ops->init_card) |
| host->ops->init_card(host, card); |
| |
| /* |
| * If the host and card support UHS-I mode request the card |
| * to switch to 1.8V signaling level. No 1.8v signalling if |
| * UHS mode is not enabled to maintain compatibility and some |
| * systems that claim 1.8v signalling in fact do not support |
| * it. Per SDIO spec v3, section 3.1.2, if the voltage is already |
| * 1.8v, the card sets S18A to 0 in the R4 response. So it will |
| * fails to check rocr & R4_18V_PRESENT, but we still need to |
| * try to init uhs card. sdio_read_cccr will take over this task |
| * to make sure which speed mode should work. |
| */ |
| if (!powered_resume && (rocr & ocr & R4_18V_PRESENT)) { |
| err = mmc_set_uhs_voltage(host, ocr_card); |
| if (err == -EAGAIN) { |
| mmc_sdio_resend_if_cond(host, card); |
| retries--; |
| goto try_again; |
| } else if (err) { |
| ocr &= ~R4_18V_PRESENT; |
| } |
| } |
| |
| /* |
| * For native busses: set card RCA and quit open drain mode. |
| */ |
| if (!powered_resume && !mmc_host_is_spi(host)) { |
| err = mmc_send_relative_addr(host, &card->rca); |
| if (err) |
| goto remove; |
| |
| /* |
| * Update oldcard with the new RCA received from the SDIO |
| * device -- we're doing this so that it's updated in the |
| * "card" struct when oldcard overwrites that later. |
| */ |
| if (oldcard) |
| oldcard->rca = card->rca; |
| } |
| |
| /* |
| * Read CSD, before selecting the card |
| */ |
| if (!oldcard && card->type == MMC_TYPE_SD_COMBO) { |
| 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 (!powered_resume && !mmc_host_is_spi(host)) { |
| err = mmc_select_card(card); |
| if (err) |
| goto remove; |
| } |
| |
| if (card->quirks & MMC_QUIRK_NONSTD_SDIO) { |
| /* |
| * This is non-standard SDIO device, meaning it doesn't |
| * have any CIA (Common I/O area) registers present. |
| * It's host's responsibility to fill cccr and cis |
| * structures in init_card(). |
| */ |
| mmc_set_clock(host, card->cis.max_dtr); |
| |
| if (card->cccr.high_speed) { |
| mmc_set_timing(card->host, MMC_TIMING_SD_HS); |
| } |
| |
| goto finish; |
| } |
| |
| /* |
| * Read the common registers. Note that we should try to |
| * validate whether UHS would work or not. |
| */ |
| err = sdio_read_cccr(card, ocr); |
| if (err) { |
| mmc_sdio_resend_if_cond(host, card); |
| if (ocr & R4_18V_PRESENT) { |
| /* Retry init sequence, but without R4_18V_PRESENT. */ |
| retries = 0; |
| goto try_again; |
| } |
| return err; |
| } |
| |
| /* |
| * Read the common CIS tuples. |
| */ |
| err = sdio_read_common_cis(card); |
| if (err) |
| goto remove; |
| |
| if (oldcard) { |
| int same = (card->cis.vendor == oldcard->cis.vendor && |
| card->cis.device == oldcard->cis.device); |
| mmc_remove_card(card); |
| if (!same) |
| return -ENOENT; |
| |
| card = oldcard; |
| } |
| card->ocr = ocr_card; |
| mmc_fixup_device(card, sdio_fixup_methods); |
| |
| if (card->type == MMC_TYPE_SD_COMBO) { |
| err = mmc_sd_setup_card(host, card, oldcard != NULL); |
| /* handle as SDIO-only card if memory init failed */ |
| if (err) { |
| mmc_go_idle(host); |
| if (mmc_host_is_spi(host)) |
| /* should not fail, as it worked previously */ |
| mmc_spi_set_crc(host, use_spi_crc); |
| card->type = MMC_TYPE_SDIO; |
| } else |
| card->dev.type = &sd_type; |
| } |
| |
| /* |
| * If needed, disconnect card detection pull-up resistor. |
| */ |
| err = sdio_disable_cd(card); |
| if (err) |
| goto remove; |
| |
| /* Initialization sequence for UHS-I cards */ |
| /* Only if card supports 1.8v and UHS signaling */ |
| if ((ocr & R4_18V_PRESENT) && card->sw_caps.sd3_bus_mode) { |
| err = mmc_sdio_init_uhs_card(card); |
| if (err) |
| goto remove; |
| } else { |
| /* |
| * Switch to high-speed (if supported). |
| */ |
| err = sdio_enable_hs(card); |
| if (err > 0) |
| mmc_set_timing(card->host, MMC_TIMING_SD_HS); |
| else if (err) |
| goto remove; |
| |
| /* |
| * Change to the card's maximum speed. |
| */ |
| mmc_set_clock(host, mmc_sdio_get_max_clock(card)); |
| |
| /* |
| * Switch to wider bus (if supported). |
| */ |
| err = sdio_enable_4bit_bus(card); |
| if (err) |
| goto remove; |
| } |
| |
| if (host->caps2 & MMC_CAP2_AVOID_3_3V && |
| host->ios.signal_voltage == MMC_SIGNAL_VOLTAGE_330) { |
| pr_err("%s: Host failed to negotiate down from 3.3V\n", |
| mmc_hostname(host)); |
| err = -EINVAL; |
| goto remove; |
| } |
| finish: |
| if (!oldcard) |
| host->card = card; |
| return 0; |
| |
| remove: |
| if (!oldcard) |
| mmc_remove_card(card); |
| |
| err: |
| return err; |
| } |
| |
| static int mmc_sdio_reinit_card(struct mmc_host *host, bool powered_resume) |
| { |
| int ret; |
| |
| sdio_reset(host); |
| mmc_go_idle(host); |
| mmc_send_if_cond(host, host->card->ocr); |
| |
| ret = mmc_send_io_op_cond(host, 0, NULL); |
| if (ret) |
| return ret; |
| |
| return mmc_sdio_init_card(host, host->card->ocr, host->card, |
| powered_resume); |
| } |
| |
| /* |
| * Host is being removed. Free up the current card. |
| */ |
| static void mmc_sdio_remove(struct mmc_host *host) |
| { |
| int i; |
| |
| for (i = 0;i < host->card->sdio_funcs;i++) { |
| if (host->card->sdio_func[i]) { |
| sdio_remove_func(host->card->sdio_func[i]); |
| host->card->sdio_func[i] = NULL; |
| } |
| } |
| |
| mmc_remove_card(host->card); |
| host->card = NULL; |
| } |
| |
| /* |
| * Card detection - card is alive. |
| */ |
| static int mmc_sdio_alive(struct mmc_host *host) |
| { |
| return mmc_select_card(host->card); |
| } |
| |
| /* |
| * Card detection callback from host. |
| */ |
| static void mmc_sdio_detect(struct mmc_host *host) |
| { |
| int err; |
| |
| /* Make sure card is powered before detecting it */ |
| if (host->caps & MMC_CAP_POWER_OFF_CARD) { |
| err = pm_runtime_get_sync(&host->card->dev); |
| if (err < 0) { |
| pm_runtime_put_noidle(&host->card->dev); |
| goto out; |
| } |
| } |
| |
| mmc_claim_host(host); |
| |
| /* |
| * Just check if our card has been removed. |
| */ |
| err = _mmc_detect_card_removed(host); |
| |
| mmc_release_host(host); |
| |
| /* |
| * Tell PM core it's OK to power off the card now. |
| * |
| * The _sync variant is used in order to ensure that the card |
| * is left powered off in case an error occurred, and the card |
| * is going to be removed. |
| * |
| * Since there is no specific reason to believe a new user |
| * is about to show up at this point, the _sync variant is |
| * desirable anyway. |
| */ |
| if (host->caps & MMC_CAP_POWER_OFF_CARD) |
| pm_runtime_put_sync(&host->card->dev); |
| |
| out: |
| if (err) { |
| mmc_sdio_remove(host); |
| |
| mmc_claim_host(host); |
| mmc_detach_bus(host); |
| mmc_power_off(host); |
| mmc_release_host(host); |
| } |
| } |
| |
| /* |
| * SDIO pre_suspend. We need to suspend all functions separately. |
| * Therefore all registered functions must have drivers with suspend |
| * and resume methods. Failing that we simply remove the whole card. |
| */ |
| static int mmc_sdio_pre_suspend(struct mmc_host *host) |
| { |
| int i, err = 0; |
| |
| for (i = 0; i < host->card->sdio_funcs; i++) { |
| struct sdio_func *func = host->card->sdio_func[i]; |
| if (func && sdio_func_present(func) && func->dev.driver) { |
| const struct dev_pm_ops *pmops = func->dev.driver->pm; |
| if (!pmops || !pmops->suspend || !pmops->resume) { |
| /* force removal of entire card in that case */ |
| err = -ENOSYS; |
| break; |
| } |
| } |
| } |
| |
| return err; |
| } |
| |
| /* |
| * SDIO suspend. Suspend all functions separately. |
| */ |
| static int mmc_sdio_suspend(struct mmc_host *host) |
| { |
| /* Prevent processing of SDIO IRQs in suspended state. */ |
| mmc_card_set_suspended(host->card); |
| cancel_delayed_work_sync(&host->sdio_irq_work); |
| |
| mmc_claim_host(host); |
| |
| if (mmc_card_keep_power(host) && mmc_card_wake_sdio_irq(host)) |
| sdio_disable_wide(host->card); |
| |
| if (!mmc_card_keep_power(host)) { |
| mmc_power_off(host); |
| } else if (host->retune_period) { |
| mmc_retune_timer_stop(host); |
| mmc_retune_needed(host); |
| } |
| |
| mmc_release_host(host); |
| |
| return 0; |
| } |
| |
| static int mmc_sdio_resume(struct mmc_host *host) |
| { |
| int err = 0; |
| |
| /* Basic card reinitialization. */ |
| mmc_claim_host(host); |
| |
| /* Restore power if needed */ |
| if (!mmc_card_keep_power(host)) { |
| mmc_power_up(host, host->card->ocr); |
| /* |
| * Tell runtime PM core we just powered up the card, |
| * since it still believes the card is powered off. |
| * Note that currently runtime PM is only enabled |
| * for SDIO cards that are MMC_CAP_POWER_OFF_CARD |
| */ |
| if (host->caps & MMC_CAP_POWER_OFF_CARD) { |
| pm_runtime_disable(&host->card->dev); |
| pm_runtime_set_active(&host->card->dev); |
| pm_runtime_enable(&host->card->dev); |
| } |
| } |
| |
| /* No need to reinitialize powered-resumed nonremovable cards */ |
| if (mmc_card_is_removable(host) || !mmc_card_keep_power(host)) { |
| err = mmc_sdio_reinit_card(host, mmc_card_keep_power(host)); |
| } else if (mmc_card_keep_power(host) && mmc_card_wake_sdio_irq(host)) { |
| /* We may have switched to 1-bit mode during suspend */ |
| err = sdio_enable_4bit_bus(host->card); |
| } |
| |
| if (err) |
| goto out; |
| |
| /* Allow SDIO IRQs to be processed again. */ |
| mmc_card_clr_suspended(host->card); |
| |
| if (host->sdio_irqs) { |
| if (!(host->caps2 & MMC_CAP2_SDIO_IRQ_NOTHREAD)) |
| wake_up_process(host->sdio_irq_thread); |
| else if (host->caps & MMC_CAP_SDIO_IRQ) |
| host->ops->enable_sdio_irq(host, 1); |
| } |
| |
| out: |
| mmc_release_host(host); |
| |
| host->pm_flags &= ~MMC_PM_KEEP_POWER; |
| return err; |
| } |
| |
| static int mmc_sdio_power_restore(struct mmc_host *host) |
| { |
| int ret; |
| |
| /* |
| * Reset the card by performing the same steps that are taken by |
| * mmc_rescan_try_freq() and mmc_attach_sdio() during a "normal" probe. |
| * |
| * sdio_reset() is technically not needed. Having just powered up the |
| * hardware, it should already be in reset state. However, some |
| * platforms (such as SD8686 on OLPC) do not instantly cut power, |
| * meaning that a reset is required when restoring power soon after |
| * powering off. It is harmless in other cases. |
| * |
| * The CMD5 reset (mmc_send_io_op_cond()), according to the SDIO spec, |
| * is not necessary for non-removable cards. However, it is required |
| * for OLPC SD8686 (which expects a [CMD5,5,3,7] init sequence), and |
| * harmless in other situations. |
| * |
| */ |
| |
| mmc_claim_host(host); |
| |
| ret = mmc_sdio_reinit_card(host, mmc_card_keep_power(host)); |
| if (!ret && host->sdio_irqs) |
| mmc_signal_sdio_irq(host); |
| |
| mmc_release_host(host); |
| |
| return ret; |
| } |
| |
| static int mmc_sdio_runtime_suspend(struct mmc_host *host) |
| { |
| /* No references to the card, cut the power to it. */ |
| mmc_claim_host(host); |
| mmc_power_off(host); |
| mmc_release_host(host); |
| |
| return 0; |
| } |
| |
| static int mmc_sdio_runtime_resume(struct mmc_host *host) |
| { |
| int ret; |
| |
| /* Restore power and re-initialize. */ |
| mmc_claim_host(host); |
| mmc_power_up(host, host->card->ocr); |
| ret = mmc_sdio_power_restore(host); |
| mmc_release_host(host); |
| |
| return ret; |
| } |
| |
| static int mmc_sdio_hw_reset(struct mmc_host *host) |
| { |
| mmc_power_cycle(host, host->card->ocr); |
| return mmc_sdio_power_restore(host); |
| } |
| |
| static int mmc_sdio_sw_reset(struct mmc_host *host) |
| { |
| mmc_set_clock(host, host->f_init); |
| sdio_reset(host); |
| mmc_go_idle(host); |
| |
| mmc_set_initial_state(host); |
| mmc_set_initial_signal_voltage(host); |
| |
| return mmc_sdio_reinit_card(host, 0); |
| } |
| |
| static const struct mmc_bus_ops mmc_sdio_ops = { |
| .remove = mmc_sdio_remove, |
| .detect = mmc_sdio_detect, |
| .pre_suspend = mmc_sdio_pre_suspend, |
| .suspend = mmc_sdio_suspend, |
| .resume = mmc_sdio_resume, |
| .runtime_suspend = mmc_sdio_runtime_suspend, |
| .runtime_resume = mmc_sdio_runtime_resume, |
| .alive = mmc_sdio_alive, |
| .hw_reset = mmc_sdio_hw_reset, |
| .sw_reset = mmc_sdio_sw_reset, |
| }; |
| |
| |
| /* |
| * Starting point for SDIO card init. |
| */ |
| int mmc_attach_sdio(struct mmc_host *host) |
| { |
| int err, i, funcs; |
| u32 ocr, rocr; |
| struct mmc_card *card; |
| |
| WARN_ON(!host->claimed); |
| |
| err = mmc_send_io_op_cond(host, 0, &ocr); |
| if (err) |
| return err; |
| |
| mmc_attach_bus(host, &mmc_sdio_ops); |
| if (host->ocr_avail_sdio) |
| host->ocr_avail = host->ocr_avail_sdio; |
| |
| |
| rocr = mmc_select_voltage(host, ocr); |
| |
| /* |
| * Can we support the voltage(s) of the card(s)? |
| */ |
| if (!rocr) { |
| err = -EINVAL; |
| goto err; |
| } |
| |
| /* |
| * Detect and init the card. |
| */ |
| err = mmc_sdio_init_card(host, rocr, NULL, 0); |
| if (err) |
| goto err; |
| |
| card = host->card; |
| |
| /* |
| * Enable runtime PM only if supported by host+card+board |
| */ |
| if (host->caps & MMC_CAP_POWER_OFF_CARD) { |
| /* |
| * Do not allow runtime suspend until after SDIO function |
| * devices are added. |
| */ |
| pm_runtime_get_noresume(&card->dev); |
| |
| /* |
| * Let runtime PM core know our card is active |
| */ |
| err = pm_runtime_set_active(&card->dev); |
| if (err) |
| goto remove; |
| |
| /* |
| * Enable runtime PM for this card |
| */ |
| pm_runtime_enable(&card->dev); |
| } |
| |
| /* |
| * The number of functions on the card is encoded inside |
| * the ocr. |
| */ |
| funcs = (ocr & 0x70000000) >> 28; |
| card->sdio_funcs = 0; |
| |
| /* |
| * Initialize (but don't add) all present functions. |
| */ |
| for (i = 0; i < funcs; i++, card->sdio_funcs++) { |
| err = sdio_init_func(host->card, i + 1); |
| if (err) |
| goto remove; |
| |
| /* |
| * Enable Runtime PM for this func (if supported) |
| */ |
| if (host->caps & MMC_CAP_POWER_OFF_CARD) |
| pm_runtime_enable(&card->sdio_func[i]->dev); |
| } |
| |
| /* |
| * First add the card to the driver model... |
| */ |
| mmc_release_host(host); |
| err = mmc_add_card(host->card); |
| if (err) |
| goto remove_added; |
| |
| /* |
| * ...then the SDIO functions. |
| */ |
| for (i = 0;i < funcs;i++) { |
| err = sdio_add_func(host->card->sdio_func[i]); |
| if (err) |
| goto remove_added; |
| } |
| |
| if (host->caps & MMC_CAP_POWER_OFF_CARD) |
| pm_runtime_put(&card->dev); |
| |
| mmc_claim_host(host); |
| return 0; |
| |
| |
| remove: |
| mmc_release_host(host); |
| remove_added: |
| /* |
| * The devices are being deleted so it is not necessary to disable |
| * runtime PM. Similarly we also don't pm_runtime_put() the SDIO card |
| * because it needs to be active to remove any function devices that |
| * were probed, and after that it gets deleted. |
| */ |
| mmc_sdio_remove(host); |
| mmc_claim_host(host); |
| err: |
| mmc_detach_bus(host); |
| |
| pr_err("%s: error %d whilst initialising SDIO card\n", |
| mmc_hostname(host), err); |
| |
| return err; |
| } |
| |