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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2018 HiSilicon Technologies Co., Ltd.
*/
#include <linux/clk.h>
#include <linux/mfd/syscon.h>
#include <linux/mmc/host.h>
#include <linux/module.h>
#include <linux/of_address.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/regmap.h>
#include <linux/regulator/consumer.h>
#include "dw_mmc.h"
#include "dw_mmc-pltfm.h"
#define ALL_INT_CLR 0x1ffff
struct hi3798cv200_priv {
struct clk *sample_clk;
struct clk *drive_clk;
};
static void dw_mci_hi3798cv200_set_ios(struct dw_mci *host, struct mmc_ios *ios)
{
struct hi3798cv200_priv *priv = host->priv;
u32 val;
val = mci_readl(host, UHS_REG);
if (ios->timing == MMC_TIMING_MMC_DDR52 ||
ios->timing == MMC_TIMING_UHS_DDR50)
val |= SDMMC_UHS_DDR;
else
val &= ~SDMMC_UHS_DDR;
mci_writel(host, UHS_REG, val);
val = mci_readl(host, ENABLE_SHIFT);
if (ios->timing == MMC_TIMING_MMC_DDR52)
val |= SDMMC_ENABLE_PHASE;
else
val &= ~SDMMC_ENABLE_PHASE;
mci_writel(host, ENABLE_SHIFT, val);
val = mci_readl(host, DDR_REG);
if (ios->timing == MMC_TIMING_MMC_HS400)
val |= SDMMC_DDR_HS400;
else
val &= ~SDMMC_DDR_HS400;
mci_writel(host, DDR_REG, val);
if (ios->timing == MMC_TIMING_MMC_HS ||
ios->timing == MMC_TIMING_LEGACY)
clk_set_phase(priv->drive_clk, 180);
else if (ios->timing == MMC_TIMING_MMC_HS200)
clk_set_phase(priv->drive_clk, 135);
}
static int dw_mci_hi3798cv200_execute_tuning(struct dw_mci_slot *slot,
u32 opcode)
{
int degrees[] = { 0, 45, 90, 135, 180, 225, 270, 315 };
struct dw_mci *host = slot->host;
struct hi3798cv200_priv *priv = host->priv;
int raise_point = -1, fall_point = -1;
int err, prev_err = -1;
int found = 0;
int i;
for (i = 0; i < ARRAY_SIZE(degrees); i++) {
clk_set_phase(priv->sample_clk, degrees[i]);
mci_writel(host, RINTSTS, ALL_INT_CLR);
err = mmc_send_tuning(slot->mmc, opcode, NULL);
if (!err)
found = 1;
if (i > 0) {
if (err && !prev_err)
fall_point = i - 1;
if (!err && prev_err)
raise_point = i;
}
if (raise_point != -1 && fall_point != -1)
goto tuning_out;
prev_err = err;
err = 0;
}
tuning_out:
if (found) {
if (raise_point == -1)
raise_point = 0;
if (fall_point == -1)
fall_point = ARRAY_SIZE(degrees) - 1;
if (fall_point < raise_point) {
if ((raise_point + fall_point) >
(ARRAY_SIZE(degrees) - 1))
i = fall_point / 2;
else
i = (raise_point + ARRAY_SIZE(degrees) - 1) / 2;
} else {
i = (raise_point + fall_point) / 2;
}
clk_set_phase(priv->sample_clk, degrees[i]);
dev_dbg(host->dev, "Tuning clk_sample[%d, %d], set[%d]\n",
raise_point, fall_point, degrees[i]);
} else {
dev_err(host->dev, "No valid clk_sample shift! use default\n");
err = -EINVAL;
}
mci_writel(host, RINTSTS, ALL_INT_CLR);
return err;
}
static int dw_mci_hi3798cv200_init(struct dw_mci *host)
{
struct hi3798cv200_priv *priv;
int ret;
priv = devm_kzalloc(host->dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
priv->sample_clk = devm_clk_get(host->dev, "ciu-sample");
if (IS_ERR(priv->sample_clk)) {
dev_err(host->dev, "failed to get ciu-sample clock\n");
return PTR_ERR(priv->sample_clk);
}
priv->drive_clk = devm_clk_get(host->dev, "ciu-drive");
if (IS_ERR(priv->drive_clk)) {
dev_err(host->dev, "failed to get ciu-drive clock\n");
return PTR_ERR(priv->drive_clk);
}
ret = clk_prepare_enable(priv->sample_clk);
if (ret) {
dev_err(host->dev, "failed to enable ciu-sample clock\n");
return ret;
}
ret = clk_prepare_enable(priv->drive_clk);
if (ret) {
dev_err(host->dev, "failed to enable ciu-drive clock\n");
goto disable_sample_clk;
}
host->priv = priv;
return 0;
disable_sample_clk:
clk_disable_unprepare(priv->sample_clk);
return ret;
}
static const struct dw_mci_drv_data hi3798cv200_data = {
.init = dw_mci_hi3798cv200_init,
.set_ios = dw_mci_hi3798cv200_set_ios,
.execute_tuning = dw_mci_hi3798cv200_execute_tuning,
};
static int dw_mci_hi3798cv200_probe(struct platform_device *pdev)
{
return dw_mci_pltfm_register(pdev, &hi3798cv200_data);
}
static int dw_mci_hi3798cv200_remove(struct platform_device *pdev)
{
struct dw_mci *host = platform_get_drvdata(pdev);
struct hi3798cv200_priv *priv = host->priv;
clk_disable_unprepare(priv->drive_clk);
clk_disable_unprepare(priv->sample_clk);
return dw_mci_pltfm_remove(pdev);
}
static const struct of_device_id dw_mci_hi3798cv200_match[] = {
{ .compatible = "hisilicon,hi3798cv200-dw-mshc", },
{},
};
MODULE_DEVICE_TABLE(of, dw_mci_hi3798cv200_match);
static struct platform_driver dw_mci_hi3798cv200_driver = {
.probe = dw_mci_hi3798cv200_probe,
.remove = dw_mci_hi3798cv200_remove,
.driver = {
.name = "dwmmc_hi3798cv200",
.of_match_table = dw_mci_hi3798cv200_match,
},
};
module_platform_driver(dw_mci_hi3798cv200_driver);
MODULE_DESCRIPTION("HiSilicon Hi3798CV200 Specific DW-MSHC Driver Extension");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:dwmmc_hi3798cv200");
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