This platform driver adds initial support for the SDHCI host controller
found on STMicroelectronics SoCs.
It has been tested on STiH41x b2020 platforms currently.
Signed-off-by: Peter Griffin <peter.grif...@linaro.org>
Signed-off-by: Giuseppe Cavallaro <peppe.cavall...@st.com>
---
drivers/mmc/host/Kconfig | 12 +++
drivers/mmc/host/Makefile | 1 +
drivers/mmc/host/sdhci-st.c | 244 ++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 257 insertions(+)
create mode 100644 drivers/mmc/host/sdhci-st.c
diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig
index 8aaf8c1..b62c40d 100644
--- a/drivers/mmc/host/Kconfig
+++ b/drivers/mmc/host/Kconfig
@@ -283,6 +283,18 @@ config MMC_SDHCI_BCM2835
If unsure, say N.
+config MMC_SDHCI_ST
+ tristate "SDHCI support on STMicroelectronics SoC"
+ depends on ARCH_STI
+ depends on MMC_SDHCI_PLTFM
+ select MMC_SDHCI_IO_ACCESSORS
+ help
+ This selects the Secure Digital Host Controller Interface in
+ STMicroelectronics SoCs.
+
+ If you have a controller with this interface, say Y or M here.
+ If unsure, say N.
+
config MMC_OMAP
tristate "TI OMAP Multimedia Card Interface support"
depends on ARCH_OMAP
diff --git a/drivers/mmc/host/Makefile b/drivers/mmc/host/Makefile
index 0c8aa5e..6e0acf7 100644
--- a/drivers/mmc/host/Makefile
+++ b/drivers/mmc/host/Makefile
@@ -64,6 +64,7 @@ obj-$(CONFIG_MMC_SDHCI_OF_HLWD) +=
sdhci-of-hlwd.o
obj-$(CONFIG_MMC_SDHCI_BCM_KONA) += sdhci-bcm-kona.o
obj-$(CONFIG_MMC_SDHCI_BCM2835) += sdhci-bcm2835.o
obj-$(CONFIG_MMC_SDHCI_MSM) += sdhci-msm.o
+obj-$(CONFIG_MMC_SDHCI_ST) += sdhci-st.o
ifeq ($(CONFIG_CB710_DEBUG),y)
CFLAGS-cb710-mmc += -DDEBUG
diff --git a/drivers/mmc/host/sdhci-st.c b/drivers/mmc/host/sdhci-st.c
new file mode 100644
index 0000000..1790fa7
--- /dev/null
+++ b/drivers/mmc/host/sdhci-st.c
@@ -0,0 +1,244 @@
+/*
+ * Support for SDHCI on STMicroelectronics SoCs
+ *
+ * Copyright (C) 2014 STMicroelectronics Ltd
+ * Author: Giuseppe Cavallaro <peppe.cavall...@st.com>
+ *
+ * Based on sdhci-cns3xxx.c
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/module.h>
+#include <linux/err.h>
+#include <linux/of_gpio.h>
+#include <linux/mmc/host.h>
+#include <linux/reset.h>
+
+#include "sdhci-pltfm.h"
+
+struct st_mmc_platform_data {
+ struct reset_control *rstc;
+};
+
+static int sdhci_st_8bit_width(struct sdhci_host *host, int width)
+{
+ u8 ctrl;
+
+ ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
+
+ switch (width) {
+ case MMC_BUS_WIDTH_8:
+ ctrl |= SDHCI_CTRL_8BITBUS;
+ ctrl &= ~SDHCI_CTRL_4BITBUS;
+ break;
+ case MMC_BUS_WIDTH_4:
+ ctrl |= SDHCI_CTRL_4BITBUS;
+ ctrl &= ~SDHCI_CTRL_8BITBUS;
+ break;
+ default:
+ ctrl &= ~(SDHCI_CTRL_8BITBUS | SDHCI_CTRL_4BITBUS);
+ break;
+ }
+
+ sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
+
+ return 0;
+}
+
+static unsigned int sdhci_st_get_max_clk(struct sdhci_host *host)
+{
+ struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
+
+ return clk_get_rate(pltfm_host->clk);
+}
+
+static u32 sdhci_st_readl(struct sdhci_host *host, int reg)
+{
+ u32 ret;
+
+ switch (reg) {
+ case SDHCI_CAPABILITIES:
+ ret = readl(host->ioaddr + reg);
+ /* Support 3.3V and 1.8V */
+ ret &= ~SDHCI_CAN_VDD_300;
+ break;
+ default:
+ ret = readl(host->ioaddr + reg);
+ }
+ return ret;
+}
+
+static const struct sdhci_ops sdhci_st_ops = {
+ .get_max_clock = sdhci_st_get_max_clk,
+ .platform_bus_width = sdhci_st_8bit_width,
+ .read_l = sdhci_st_readl,
+};
+
+static const struct sdhci_pltfm_data sdhci_st_pdata = {
+ .ops = &sdhci_st_ops,
+ .quirks = SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC |
+ SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN,
+};
+
+
+static int sdhci_st_probe(struct platform_device *pdev)
+{
+ struct device_node *np = pdev->dev.of_node;
+ struct sdhci_host *host;
+ struct st_mmc_platform_data *pdata;
+ struct sdhci_pltfm_host *pltfm_host;
+ struct clk *clk;
+ int ret = 0;
+ u16 host_version;
+
+ dev_dbg(&pdev->dev, "SDHCI ST platform driver\n");
+
+ pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
+ if (!pdata)
+ return -ENOMEM;
+
+ pdata->rstc = devm_reset_control_get(&pdev->dev, NULL);
+ if (IS_ERR(pdata->rstc))
+ pdata->rstc = NULL;
+ else
+ reset_control_deassert(pdata->rstc);
+
+ clk = devm_clk_get(&pdev->dev, "mmc");
+ if (IS_ERR(clk)) {
+ dev_err(&pdev->dev, "Perpheral clk not found\n");
+ return PTR_ERR(clk);
+ }
+
+ host = sdhci_pltfm_init(pdev, &sdhci_st_pdata, 0);
+ if (IS_ERR(host)) {
+ dev_err(&pdev->dev, "Failed sdhci_pltfm_init\n");
+ return PTR_ERR(host);
+ }
+
+ clk_prepare_enable(clk);
+
+ host->mmc->caps |= MMC_CAP_8_BIT_DATA | MMC_CAP_BUS_WIDTH_TEST
+ | MMC_CAP_1_8V_DDR;
+
+ if (of_property_read_bool(np, "non-removable"))
+ host->mmc->caps |= MMC_CAP_NONREMOVABLE;
+
+ pltfm_host = sdhci_priv(host);
+ pltfm_host->clk = clk;
+
+ ret = sdhci_add_host(host);
+ if (ret) {
+ dev_err(&pdev->dev, "Failed sdhci_add_host\n");
+ goto err_out;
+ }
+
+ pltfm_host->priv = pdata;
+
+ platform_set_drvdata(pdev, host);
+
+ host_version = readw_relaxed((host->ioaddr + SDHCI_HOST_VERSION));
+
+ dev_dbg(&pdev->dev, "SDHCI ST Initialised: Host Version: 0x%x Vendor
Version 0x%x\n",
+ host_version, ((host_version & SDHCI_VENDOR_VER_MASK) >>
+ SDHCI_VENDOR_VER_SHIFT));
+
+ return 0;
+
+err_out:
+ clk_disable_unprepare(clk);
+ sdhci_pltfm_free(pdev);
+
+ return ret;
+}
+
+static int sdhci_st_remove(struct platform_device *pdev)
+{
+ struct sdhci_host *host = platform_get_drvdata(pdev);
+ struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
+ struct st_mmc_platform_data *pdata = pltfm_host->priv;
+ int ret;
+
+ clk_disable_unprepare(pltfm_host->clk);
+
+ ret = sdhci_pltfm_unregister(pdev);
+
+ if (pdata->rstc)
+ reset_control_assert(pdata->rstc);
+
+ return ret;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int sdhci_st_suspend(struct device *dev)
+{
+ struct sdhci_host *host = dev_get_drvdata(dev);
+ struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
+ struct st_mmc_platform_data *pdata = pltfm_host->priv;
+ int ret = sdhci_suspend_host(host);
+
+ if (ret)
+ goto out;
+
+ if (pdata->rstc)
+ reset_control_assert(pdata->rstc);
+
+ clk_disable_unprepare(pltfm_host->clk);
+out:
+ return ret;
+}
+
+static int sdhci_st_resume(struct device *dev)
+{
+ struct sdhci_host *host = dev_get_drvdata(dev);
+ struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
+ struct st_mmc_platform_data *pdata = pltfm_host->priv;
+
+ clk_prepare_enable(pltfm_host->clk);
+
+ if (pdata->rstc)
+ reset_control_deassert(pdata->rstc);
+
+ return sdhci_resume_host(host);
+}
+
+static SIMPLE_DEV_PM_OPS(sdhci_st_pmops, sdhci_st_suspend, sdhci_st_resume);
+#define SDHCI_ST_PMOPS (&sdhci_st_pmops)
+#else
+#define SDHCI_ST_PMOPS NULL
+#endif
+
+static const struct of_device_id st_sdhci_match[] = {
+ { .compatible = "st,sdhci" },
+ {},
+};
+
+MODULE_DEVICE_TABLE(of, st_sdhci_match);
+
+static struct platform_driver sdhci_st_driver = {
+ .probe = sdhci_st_probe,
+ .remove = sdhci_st_remove,
+ .driver = {
+ .name = "sdhci-st",
+ .owner = THIS_MODULE,
+ .pm = SDHCI_ST_PMOPS,
+ .of_match_table = of_match_ptr(st_sdhci_match),
+ },
+};
+
+module_platform_driver(sdhci_st_driver);
+
+MODULE_DESCRIPTION("SDHCI driver for STMicroelectronics SoCs");
+MODULE_AUTHOR("Giuseppe Cavallaro <peppe.cavall...@st.com>");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:st-sdhci");
--
1.9.1
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