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| author | Liming Sun <limings@nvidia.com> | 2024-06-12 18:52:38 -0400 |
|---|---|---|
| committer | Ulf Hansson <ulf.hansson@linaro.org> | 2024-07-08 15:02:46 +0200 |
| commit | c17aecf85800ac91ec67fd7134107526a4bab3b0 (patch) | |
| tree | 4c969fb29ca2dcb05e06374c603270f5ebf94a98 /drivers/mmc | |
| parent | f21adcb86653e2b2784bbc0f180c332b50c404df (diff) | |
| download | lwn-c17aecf85800ac91ec67fd7134107526a4bab3b0.tar.gz lwn-c17aecf85800ac91ec67fd7134107526a4bab3b0.zip | |
mmc: dw_mmc-bluefield: Add support for eMMC HW reset
The eMMC RST_N register is implemented as secure register on the BlueField
SoC and controlled by TF-A. This commit sends an SMC call to TF-A for the
eMMC HW reset.
Reviewed-by: David Thompson <davthompson@nvidia.com>
Signed-off-by: Liming Sun <limings@nvidia.com>
Link: https://lore.kernel.org/r/2c459196c6867e325f9386ec0559efea464cfdd6.1718213918.git.limings@nvidia.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Diffstat (limited to 'drivers/mmc')
| -rw-r--r-- | drivers/mmc/host/dw_mmc-bluefield.c | 18 |
1 files changed, 17 insertions, 1 deletions
diff --git a/drivers/mmc/host/dw_mmc-bluefield.c b/drivers/mmc/host/dw_mmc-bluefield.c index 4747e5698f48..24e0b604b405 100644 --- a/drivers/mmc/host/dw_mmc-bluefield.c +++ b/drivers/mmc/host/dw_mmc-bluefield.c @@ -3,6 +3,7 @@ * Copyright (C) 2018 Mellanox Technologies. */ +#include <linux/arm-smccc.h> #include <linux/bitfield.h> #include <linux/bitops.h> #include <linux/mmc/host.h> @@ -20,6 +21,9 @@ #define BLUEFIELD_UHS_REG_EXT_SAMPLE 2 #define BLUEFIELD_UHS_REG_EXT_DRIVE 4 +/* SMC call for RST_N */ +#define BLUEFIELD_SMC_SET_EMMC_RST_N 0x82000007 + static void dw_mci_bluefield_set_ios(struct dw_mci *host, struct mmc_ios *ios) { u32 reg; @@ -34,8 +38,20 @@ static void dw_mci_bluefield_set_ios(struct dw_mci *host, struct mmc_ios *ios) mci_writel(host, UHS_REG_EXT, reg); } +static void dw_mci_bluefield_hw_reset(struct dw_mci *host) +{ + struct arm_smccc_res res = { 0 }; + + arm_smccc_smc(BLUEFIELD_SMC_SET_EMMC_RST_N, 0, 0, 0, 0, 0, 0, 0, + &res); + + if (res.a0) + pr_err("RST_N failed.\n"); +} + static const struct dw_mci_drv_data bluefield_drv_data = { - .set_ios = dw_mci_bluefield_set_ios + .set_ios = dw_mci_bluefield_set_ios, + .hw_reset = dw_mci_bluefield_hw_reset }; static const struct of_device_id dw_mci_bluefield_match[] = { |