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

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>

diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig
index 0581c199c996546d9f02b8fe5db0f5cfbc9963fc..694d0828215d22a41138dbe16fae3e38c2bbe956 100644 (file)
--- a/drivers/mmc/host/Kconfig
+++ b/drivers/mmc/host/Kconfig
@@ -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

diff --git a/drivers/mmc/host/Makefile b/drivers/mmc/host/Makefile
index 85dc1322c3de1bc50c8456ea3ec5d664215f07d6..a18fbba1b97e792578f713d991eaf967ab470392 100644 (file)
--- a/drivers/mmc/host/Makefile
+++ b/drivers/mmc/host/Makefile
@@ -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

diff --git a/drivers/mmc/host/sdhci-of-dwcmshc.c b/drivers/mmc/host/sdhci-of-dwcmshc.c
new file mode 100644 (file)
index 0000000..1b7cd14
--- /dev/null
+++ b/drivers/mmc/host/sdhci-of-dwcmshc.c
@@ -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");