/* * 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 #include #include #include #include #include #include #include #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<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; } else { goto remove; } } /* * 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; } finish: if (!oldcard) host->card = card; return 0; remove: if (!oldcard) mmc_remove_card(card); err: return err; } /* * 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) { 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)) { sdio_reset(host); mmc_go_idle(host); mmc_send_if_cond(host, host->card->ocr); err = mmc_send_io_op_cond(host, 0, NULL); if (!err) err = mmc_sdio_init_card(host, host->card->ocr, host->card, 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 && 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); } 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; mmc_claim_host(host); /* * 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. * */ 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) goto out; ret = mmc_sdio_init_card(host, host->card->ocr, host->card, mmc_card_keep_power(host)); if (!ret && host->sdio_irqs) mmc_signal_sdio_irq(host); out: 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_reset(struct mmc_host *host) { mmc_power_cycle(host, host->card->ocr); return mmc_sdio_power_restore(host); } 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, .power_restore = mmc_sdio_power_restore, .alive = mmc_sdio_alive, .reset = mmc_sdio_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; }