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mmc: sdhci-of-dwcmshc: add SDHCI OF Synopsys DWC MSHC driver

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Add a driver for SDHCI OF Synopsys DesignWare Cores Mobile Storage

Signed-off-by: Jisheng Zhang <Jisheng.Zhang@synaptics.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
This commit is contained in:
Jisheng Zhang 2018-07-06 15:23:55 +08:00 committed by Ulf Hansson
parent aaadfa6690
commit e438cf49b3
3 changed files with 128 additions and 0 deletions
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11
drivers/mmc/host/Kconfig
View File

@ -176,6 +176,17 @@ config MMC_SDHCI_OF_HLWD
If unsure, say N.
config MMC_SDHCI_OF_DWCMSHC
tristate "SDHCI OF support for the Synopsys DWC MSHC"
depends on MMC_SDHCI_PLTFM
depends on OF
depends on COMMON_CLK
help
This selects Synopsys DesignWare Cores Mobile Storage Controller
support.
If you have a controller with this interface, say Y or M here.
If unsure, say N.
config MMC_SDHCI_CADENCE
tristate "SDHCI support for the Cadence SD/SDIO/eMMC controller"
depends on MMC_SDHCI_PLTFM

1
drivers/mmc/host/Makefile
View File

@ -82,6 +82,7 @@ obj-$(CONFIG_MMC_SDHCI_OF_ARASAN) += sdhci-of-arasan.o
obj-$(CONFIG_MMC_SDHCI_OF_AT91) += sdhci-of-at91.o
obj-$(CONFIG_MMC_SDHCI_OF_ESDHC) += sdhci-of-esdhc.o
obj-$(CONFIG_MMC_SDHCI_OF_HLWD) += sdhci-of-hlwd.o
obj-$(CONFIG_MMC_SDHCI_OF_DWCMSHC) += sdhci-of-dwcmshc.o
obj-$(CONFIG_MMC_SDHCI_BCM_KONA) += sdhci-bcm-kona.o
obj-$(CONFIG_MMC_SDHCI_IPROC) += sdhci-iproc.o
obj-$(CONFIG_MMC_SDHCI_MSM) += sdhci-msm.o

116
drivers/mmc/host/sdhci-of-dwcmshc.c Normal file
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@ -0,0 +1,116 @@
// SPDX-License-Identifier: GPL-2.0
/*
* Driver for Synopsys DesignWare Cores Mobile Storage Host Controller
*
* Copyright (C) 2018 Synaptics Incorporated
*
* Author: Jisheng Zhang <jszhang@kernel.org>
*/
#include <linux/clk.h>
#include <linux/module.h>
#include <linux/of.h>
#include "sdhci-pltfm.h"
struct dwcmshc_priv {
struct clk *bus_clk;
};
static const struct sdhci_ops sdhci_dwcmshc_ops = {
.set_clock = sdhci_set_clock,
.set_bus_width = sdhci_set_bus_width,
.set_uhs_signaling = sdhci_set_uhs_signaling,
.get_max_clock = sdhci_pltfm_clk_get_max_clock,
.reset = sdhci_reset,
};
static const struct sdhci_pltfm_data sdhci_dwcmshc_pdata = {
.ops = &sdhci_dwcmshc_ops,
.quirks = SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN,
};
static int dwcmshc_probe(struct platform_device *pdev)
{
struct sdhci_pltfm_host *pltfm_host;
struct sdhci_host *host;
struct dwcmshc_priv *priv;
int err;
host = sdhci_pltfm_init(pdev, &sdhci_dwcmshc_pdata,
sizeof(struct dwcmshc_priv));
if (IS_ERR(host))
return PTR_ERR(host);
pltfm_host = sdhci_priv(host);
priv = sdhci_pltfm_priv(pltfm_host);
pltfm_host->clk = devm_clk_get(&pdev->dev, "core");
if (IS_ERR(pltfm_host->clk)) {
err = PTR_ERR(pltfm_host->clk);
dev_err(&pdev->dev, "failed to get core clk: %d\n", err);
goto free_pltfm;
}
err = clk_prepare_enable(pltfm_host->clk);
if (err)
goto free_pltfm;
priv->bus_clk = devm_clk_get(&pdev->dev, "bus");
if (!IS_ERR(priv->bus_clk))
clk_prepare_enable(priv->bus_clk);
err = mmc_of_parse(host->mmc);
if (err)
goto err_clk;
sdhci_get_of_property(pdev);
err = sdhci_add_host(host);
if (err)
goto err_clk;
return 0;
err_clk:
clk_disable_unprepare(pltfm_host->clk);
clk_disable_unprepare(priv->bus_clk);
free_pltfm:
sdhci_pltfm_free(pdev);
return err;
}
static int dwcmshc_remove(struct platform_device *pdev)
{
struct sdhci_host *host = platform_get_drvdata(pdev);
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct dwcmshc_priv *priv = sdhci_pltfm_priv(pltfm_host);
sdhci_remove_host(host, 0);
clk_disable_unprepare(pltfm_host->clk);
clk_disable_unprepare(priv->bus_clk);
sdhci_pltfm_free(pdev);
return 0;
}
static const struct of_device_id sdhci_dwcmshc_dt_ids[] = {
{ .compatible = "snps,dwcmshc-sdhci" },
{}
};
MODULE_DEVICE_TABLE(of, sdhci_dwcmshc_dt_ids);
static struct platform_driver sdhci_dwcmshc_driver = {
.driver = {
.name = "sdhci-dwcmshc",
.of_match_table = sdhci_dwcmshc_dt_ids,
},
.probe = dwcmshc_probe,
.remove = dwcmshc_remove,
};
module_platform_driver(sdhci_dwcmshc_driver);
MODULE_DESCRIPTION("SDHCI platform driver for Synopsys DWC MSHC");
MODULE_AUTHOR("Jisheng Zhang <jszhang@kernel.org>");
MODULE_LICENSE("GPL v2");