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1// SPDX-License-Identifier: GPL-2.02/*3 * Copyright (C) 2018 Mellanox Technologies.4 */5 6#include <linux/arm-smccc.h>7#include <linux/bitfield.h>8#include <linux/bitops.h>9#include <linux/mmc/host.h>10#include <linux/mmc/mmc.h>11#include <linux/module.h>12#include <linux/of.h>13#include <linux/platform_device.h>14#include <linux/pm_runtime.h>15 16#include "dw_mmc.h"17#include "dw_mmc-pltfm.h"18 19#define UHS_REG_EXT_SAMPLE_MASK GENMASK(22, 16)20#define UHS_REG_EXT_DRIVE_MASK GENMASK(29, 23)21#define BLUEFIELD_UHS_REG_EXT_SAMPLE 222#define BLUEFIELD_UHS_REG_EXT_DRIVE 423 24/* SMC call for RST_N */25#define BLUEFIELD_SMC_SET_EMMC_RST_N 0x8200000726 27static void dw_mci_bluefield_set_ios(struct dw_mci *host, struct mmc_ios *ios)28{29 u32 reg;30 31 /* Update the Drive and Sample fields in register UHS_REG_EXT. */32 reg = mci_readl(host, UHS_REG_EXT);33 reg &= ~UHS_REG_EXT_SAMPLE_MASK;34 reg |= FIELD_PREP(UHS_REG_EXT_SAMPLE_MASK,35 BLUEFIELD_UHS_REG_EXT_SAMPLE);36 reg &= ~UHS_REG_EXT_DRIVE_MASK;37 reg |= FIELD_PREP(UHS_REG_EXT_DRIVE_MASK, BLUEFIELD_UHS_REG_EXT_DRIVE);38 mci_writel(host, UHS_REG_EXT, reg);39}40 41static void dw_mci_bluefield_hw_reset(struct dw_mci *host)42{43 struct arm_smccc_res res = { 0 };44 45 arm_smccc_smc(BLUEFIELD_SMC_SET_EMMC_RST_N, 0, 0, 0, 0, 0, 0, 0,46 &res);47 48 if (res.a0)49 pr_err("RST_N failed.\n");50}51 52static const struct dw_mci_drv_data bluefield_drv_data = {53 .set_ios = dw_mci_bluefield_set_ios,54 .hw_reset = dw_mci_bluefield_hw_reset55};56 57static const struct of_device_id dw_mci_bluefield_match[] = {58 { .compatible = "mellanox,bluefield-dw-mshc",59 .data = &bluefield_drv_data },60 {},61};62MODULE_DEVICE_TABLE(of, dw_mci_bluefield_match);63 64static int dw_mci_bluefield_probe(struct platform_device *pdev)65{66 return dw_mci_pltfm_register(pdev, &bluefield_drv_data);67}68 69static struct platform_driver dw_mci_bluefield_pltfm_driver = {70 .probe = dw_mci_bluefield_probe,71 .remove_new = dw_mci_pltfm_remove,72 .driver = {73 .name = "dwmmc_bluefield",74 .probe_type = PROBE_PREFER_ASYNCHRONOUS,75 .of_match_table = dw_mci_bluefield_match,76 .pm = &dw_mci_pltfm_pmops,77 },78};79 80module_platform_driver(dw_mci_bluefield_pltfm_driver);81 82MODULE_DESCRIPTION("BlueField DW Multimedia Card driver");83MODULE_AUTHOR("Mellanox Technologies");84MODULE_LICENSE("GPL v2");85