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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2018 Mellanox Technologies.
*/
#include <linux/arm-smccc.h>
#include <linux/bitfield.h>
#include <linux/bitops.h>
#include <linux/mmc/host.h>
#include <linux/mmc/mmc.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include "dw_mmc.h"
#include "dw_mmc-pltfm.h"
#define UHS_REG_EXT_SAMPLE_MASK GENMASK(22, 16)
#define UHS_REG_EXT_DRIVE_MASK GENMASK(29, 23)
#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;
/* Update the Drive and Sample fields in register UHS_REG_EXT. */
reg = mci_readl(host, UHS_REG_EXT);
reg &= ~UHS_REG_EXT_SAMPLE_MASK;
reg |= FIELD_PREP(UHS_REG_EXT_SAMPLE_MASK,
BLUEFIELD_UHS_REG_EXT_SAMPLE);
reg &= ~UHS_REG_EXT_DRIVE_MASK;
reg |= FIELD_PREP(UHS_REG_EXT_DRIVE_MASK, BLUEFIELD_UHS_REG_EXT_DRIVE);
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,
.hw_reset = dw_mci_bluefield_hw_reset
};
static const struct of_device_id dw_mci_bluefield_match[] = {
{ .compatible = "mellanox,bluefield-dw-mshc",
.data = &bluefield_drv_data },
{},
};
MODULE_DEVICE_TABLE(of, dw_mci_bluefield_match);
static int dw_mci_bluefield_probe(struct platform_device *pdev)
{
return dw_mci_pltfm_register(pdev, &bluefield_drv_data);
}
static struct platform_driver dw_mci_bluefield_pltfm_driver = {
.probe = dw_mci_bluefield_probe,
.remove_new = dw_mci_pltfm_remove,
.driver = {
.name = "dwmmc_bluefield",
.probe_type = PROBE_PREFER_ASYNCHRONOUS,
.of_match_table = dw_mci_bluefield_match,
.pm = &dw_mci_pltfm_pmops,
},
};
module_platform_driver(dw_mci_bluefield_pltfm_driver);
MODULE_DESCRIPTION("BlueField DW Multimedia Card driver");
MODULE_AUTHOR("Mellanox Technologies");
MODULE_LICENSE("GPL v2");
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