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authorAdrian Hunter <adrian.hunter@intel.com>2011-08-29 16:42:11 +0300
committerChris Ball <cjb@laptop.org>2011-10-26 16:32:05 -0400
commitb2499518b5ad7e28bb3ed348fd3f370eeb1e36c0 (patch)
treec4c9597d0631554bffeecbcc6a2a7ec3037ea78c /include/linux
parent8e3336b1e4378f7d205af9b25dcc9e645c8a9609 (diff)
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 <adrian.hunter@intel.com> Signed-off-by: Chris Ball <cjb@laptop.org>
Diffstat (limited to 'include/linux')
-rw-r--r--include/linux/mmc/card.h1
-rw-r--r--include/linux/mmc/core.h3
-rw-r--r--include/linux/mmc/host.h2
-rw-r--r--include/linux/mmc/mmc.h4
4 files changed, 10 insertions, 0 deletions
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
*/