From b2499518b5ad7e28bb3ed348fd3f370eeb1e36c0 Mon Sep 17 00:00:00 2001 From: Adrian Hunter Date: Mon, 29 Aug 2011 16:42:11 +0300 Subject: mmc: core: add eMMC hardware reset support eMMC's may have a hardware reset line. This patch provides a host controller operation to implement hardware reset and a function to reset and reinitialize the card. Also, for MMC, the reset is always performed before initialization. The host must set the new host capability MMC_CAP_HW_RESET to enable hardware reset. Signed-off-by: Adrian Hunter Signed-off-by: Chris Ball --- include/linux/mmc/card.h | 1 + include/linux/mmc/core.h | 3 +++ include/linux/mmc/host.h | 2 ++ include/linux/mmc/mmc.h | 4 ++++ 4 files changed, 10 insertions(+) (limited to 'include/linux') diff --git a/include/linux/mmc/card.h b/include/linux/mmc/card.h index 6dfb293326e..5294ddf382a 100644 --- a/include/linux/mmc/card.h +++ b/include/linux/mmc/card.h @@ -50,6 +50,7 @@ struct mmc_ext_csd { u8 rel_sectors; u8 rel_param; u8 part_config; + u8 rst_n_function; unsigned int part_time; /* Units: ms */ unsigned int sa_timeout; /* Units: 100ns */ unsigned int hs_max_dtr; diff --git a/include/linux/mmc/core.h b/include/linux/mmc/core.h index b8b1b7a311f..56e5625b6f4 100644 --- a/include/linux/mmc/core.h +++ b/include/linux/mmc/core.h @@ -162,6 +162,9 @@ extern int mmc_erase_group_aligned(struct mmc_card *card, unsigned int from, extern unsigned int mmc_calc_max_discard(struct mmc_card *card); extern int mmc_set_blocklen(struct mmc_card *card, unsigned int blocklen); +extern int mmc_hw_reset(struct mmc_host *host); +extern int mmc_hw_reset_check(struct mmc_host *host); +extern int mmc_can_reset(struct mmc_card *card); extern void mmc_set_data_timeout(struct mmc_data *, const struct mmc_card *); extern unsigned int mmc_align_data_size(struct mmc_card *, unsigned int); diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h index 340cc0c9409..b2aefea9704 100644 --- a/include/linux/mmc/host.h +++ b/include/linux/mmc/host.h @@ -151,6 +151,7 @@ struct mmc_host_ops { int (*execute_tuning)(struct mmc_host *host); void (*enable_preset_value)(struct mmc_host *host, bool enable); int (*select_drive_strength)(unsigned int max_dtr, int host_drv, int card_drv); + void (*hw_reset)(struct mmc_host *host); }; struct mmc_card; @@ -233,6 +234,7 @@ struct mmc_host { #define MMC_CAP_MAX_CURRENT_600 (1 << 28) /* Host max current limit is 600mA */ #define MMC_CAP_MAX_CURRENT_800 (1 << 29) /* Host max current limit is 800mA */ #define MMC_CAP_CMD23 (1 << 30) /* CMD23 supported. */ +#define MMC_CAP_HW_RESET (1 << 31) /* Hardware reset */ mmc_pm_flag_t pm_caps; /* supported pm features */ diff --git a/include/linux/mmc/mmc.h b/include/linux/mmc/mmc.h index 5a794cb503e..ed8fca890ee 100644 --- a/include/linux/mmc/mmc.h +++ b/include/linux/mmc/mmc.h @@ -272,6 +272,7 @@ struct _mmc_csd { #define EXT_CSD_PARTITION_ATTRIBUTE 156 /* R/W */ #define EXT_CSD_PARTITION_SUPPORT 160 /* RO */ +#define EXT_CSD_RST_N_FUNCTION 162 /* R/W */ #define EXT_CSD_WR_REL_PARAM 166 /* RO */ #define EXT_CSD_ERASE_GROUP_DEF 175 /* R/W */ #define EXT_CSD_PART_CONFIG 179 /* R/W */ @@ -328,6 +329,9 @@ struct _mmc_csd { #define EXT_CSD_SEC_BD_BLK_EN BIT(2) #define EXT_CSD_SEC_GB_CL_EN BIT(4) +#define EXT_CSD_RST_N_EN_MASK 0x3 +#define EXT_CSD_RST_N_ENABLED 1 /* RST_n is enabled on card */ + /* * MMC_SWITCH access modes */ -- cgit v1.2.3-70-g09d2