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c17aecf858
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>
85 lines
2.2 KiB
C
85 lines
2.2 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2018 Mellanox Technologies.
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*/
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#include <linux/arm-smccc.h>
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#include <linux/bitfield.h>
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#include <linux/bitops.h>
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#include <linux/mmc/host.h>
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#include <linux/mmc/mmc.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/platform_device.h>
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#include <linux/pm_runtime.h>
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#include "dw_mmc.h"
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#include "dw_mmc-pltfm.h"
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#define UHS_REG_EXT_SAMPLE_MASK GENMASK(22, 16)
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#define UHS_REG_EXT_DRIVE_MASK GENMASK(29, 23)
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#define BLUEFIELD_UHS_REG_EXT_SAMPLE 2
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#define BLUEFIELD_UHS_REG_EXT_DRIVE 4
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/* SMC call for RST_N */
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#define BLUEFIELD_SMC_SET_EMMC_RST_N 0x82000007
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static void dw_mci_bluefield_set_ios(struct dw_mci *host, struct mmc_ios *ios)
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{
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u32 reg;
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/* Update the Drive and Sample fields in register UHS_REG_EXT. */
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reg = mci_readl(host, UHS_REG_EXT);
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reg &= ~UHS_REG_EXT_SAMPLE_MASK;
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reg |= FIELD_PREP(UHS_REG_EXT_SAMPLE_MASK,
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BLUEFIELD_UHS_REG_EXT_SAMPLE);
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reg &= ~UHS_REG_EXT_DRIVE_MASK;
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reg |= FIELD_PREP(UHS_REG_EXT_DRIVE_MASK, BLUEFIELD_UHS_REG_EXT_DRIVE);
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mci_writel(host, UHS_REG_EXT, reg);
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}
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static void dw_mci_bluefield_hw_reset(struct dw_mci *host)
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{
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struct arm_smccc_res res = { 0 };
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arm_smccc_smc(BLUEFIELD_SMC_SET_EMMC_RST_N, 0, 0, 0, 0, 0, 0, 0,
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&res);
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if (res.a0)
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pr_err("RST_N failed.\n");
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}
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static const struct dw_mci_drv_data bluefield_drv_data = {
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.set_ios = dw_mci_bluefield_set_ios,
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.hw_reset = dw_mci_bluefield_hw_reset
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};
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static const struct of_device_id dw_mci_bluefield_match[] = {
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{ .compatible = "mellanox,bluefield-dw-mshc",
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.data = &bluefield_drv_data },
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{},
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};
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MODULE_DEVICE_TABLE(of, dw_mci_bluefield_match);
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static int dw_mci_bluefield_probe(struct platform_device *pdev)
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{
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return dw_mci_pltfm_register(pdev, &bluefield_drv_data);
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}
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static struct platform_driver dw_mci_bluefield_pltfm_driver = {
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.probe = dw_mci_bluefield_probe,
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.remove_new = dw_mci_pltfm_remove,
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.driver = {
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.name = "dwmmc_bluefield",
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.probe_type = PROBE_PREFER_ASYNCHRONOUS,
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.of_match_table = dw_mci_bluefield_match,
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.pm = &dw_mci_pltfm_pmops,
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},
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};
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module_platform_driver(dw_mci_bluefield_pltfm_driver);
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MODULE_DESCRIPTION("BlueField DW Multimedia Card driver");
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MODULE_AUTHOR("Mellanox Technologies");
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MODULE_LICENSE("GPL v2");
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