diff options
| author | Shawn Lin <shawn.lin@rock-chips.com> | 2016-01-14 04:08:02 +0300 |
|---|---|---|
| committer | Ulf Hansson <ulf.hansson@linaro.org> | 2016-02-29 13:03:09 +0300 |
| commit | 935a665e15dcda3b0b986829f32e2724db1f20fc (patch) | |
| tree | 523bcaa8f8c40a11922e32b20ebac44052ff0b89 /drivers/mmc/host/dw_mmc.h | |
| parent | aaaaeb7a933471f6413ca44dd36efd57f2fa9429 (diff) | |
| download | linux-935a665e15dcda3b0b986829f32e2724db1f20fc.tar.xz | |
mmc: dw_mmc: add hw_reset support
This patch implement hw_reset function for DesignWare
MMC controller. By adding this feature, mmc blk can
do some basic recovery.
Set the following resets:
software reset – BMOD[0] for IDMAC only
DMA reset - CTRL[2]
FIFO reset - CTRL[1] bits
Program the CARD_RESET register with a value of 0 for the bit
corresponding to the card number; This programming asserts the
RST_n signal and resets the card. After a minimum of 1 ?s, de-asserts the
RST_n signal and takes the card out of reset. The application can program
a new CMD only after a minimum of 200 us
This implementation can be easily tested by cutting off->On vmmc
while doing data accessing in background to simulate that case.
Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>
Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Diffstat (limited to 'drivers/mmc/host/dw_mmc.h')
| -rw-r--r-- | drivers/mmc/host/dw_mmc.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/mmc/host/dw_mmc.h b/drivers/mmc/host/dw_mmc.h index 6fc84b61dc8c..68d5da2dfd19 100644 --- a/drivers/mmc/host/dw_mmc.h +++ b/drivers/mmc/host/dw_mmc.h @@ -46,6 +46,7 @@ #define SDMMC_VERID 0x06c #define SDMMC_HCON 0x070 #define SDMMC_UHS_REG 0x074 +#define SDMMC_RST_N 0x078 #define SDMMC_BMOD 0x080 #define SDMMC_PLDMND 0x084 #define SDMMC_DBADDR 0x088 @@ -169,6 +170,8 @@ #define SDMMC_IDMAC_ENABLE BIT(7) #define SDMMC_IDMAC_FB BIT(1) #define SDMMC_IDMAC_SWRESET BIT(0) +/* H/W reset */ +#define SDMMC_RST_HWACTIVE 0x1 /* Version ID register define */ #define SDMMC_GET_VERID(x) ((x) & 0xFFFF) /* Card read threshold */ |