[PATCH v4 01/10] mmc: sdhci-st: Intial support for ST SDHCI controller
Ulf Hansson
ulf.hansson at linaro.org
Thu Jul 10 00:12:32 PDT 2014
On 9 July 2014 17:07, Peter Griffin <peter.griffin at linaro.org> wrote:
> 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: Giuseppe Cavallaro <peppe.cavallaro at st.com>
> Signed-off-by: Peter Griffin <peter.griffin at linaro.org>
> Acked-by: Lee Jones <lee.jones at linaro.org>
> Acked-by: Maxime Coquelin <maxime.coquelin at st.com>
Thanks! Applied for next!
Kind regards
Uffe
> ---
> drivers/mmc/host/Kconfig | 12 +++
> drivers/mmc/host/Makefile | 1 +
> drivers/mmc/host/sdhci-st.c | 176 ++++++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 189 insertions(+)
> create mode 100644 drivers/mmc/host/sdhci-st.c
>
> diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig
> index a565254..6615b79 100644
> --- a/drivers/mmc/host/Kconfig
> +++ b/drivers/mmc/host/Kconfig
> @@ -290,6 +290,18 @@ config MMC_MOXART
> be found on some embedded hardware such as UC-7112-LX.
> If you have a controller with this interface, say Y here.
>
> +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 7f81ddf..f211eed 100644
> --- a/drivers/mmc/host/Makefile
> +++ b/drivers/mmc/host/Makefile
> @@ -68,6 +68,7 @@ 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..328f348
> --- /dev/null
> +++ b/drivers/mmc/host/sdhci-st.c
> @@ -0,0 +1,176 @@
> +/*
> + * Support for SDHCI on STMicroelectronics SoCs
> + *
> + * Copyright (C) 2014 STMicroelectronics Ltd
> + * Author: Giuseppe Cavallaro <peppe.cavallaro at st.com>
> + * Contributors: Peter Griffin <peter.griffin at linaro.org>
> + *
> + * 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/mmc/host.h>
> +
> +#include "sdhci-pltfm.h"
> +
> +static u32 sdhci_st_readl(struct sdhci_host *host, int reg)
> +{
> + u32 ret;
> +
> + switch (reg) {
> + case SDHCI_CAPABILITIES:
> + ret = readl_relaxed(host->ioaddr + reg);
> + /* Support 3.3V and 1.8V */
> + ret &= ~SDHCI_CAN_VDD_300;
> + break;
> + default:
> + ret = readl_relaxed(host->ioaddr + reg);
> + }
> + return ret;
> +}
> +
> +static const struct sdhci_ops sdhci_st_ops = {
> + .get_max_clock = sdhci_pltfm_clk_get_max_clock,
> + .set_clock = sdhci_set_clock,
> + .set_bus_width = sdhci_set_bus_width,
> + .read_l = sdhci_st_readl,
> + .reset = sdhci_reset,
> +};
> +
> +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 sdhci_host *host;
> + struct sdhci_pltfm_host *pltfm_host;
> + struct clk *clk;
> + int ret = 0;
> + u16 host_version;
> +
> + clk = devm_clk_get(&pdev->dev, "mmc");
> + if (IS_ERR(clk)) {
> + dev_err(&pdev->dev, "Peripheral 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);
> + }
> +
> + ret = mmc_of_parse(host->mmc);
> +
> + if (ret) {
> + dev_err(&pdev->dev, "Failed mmc_of_parse\n");
> + return ret;
> + }
> +
> + clk_prepare_enable(clk);
> +
> + 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;
> + }
> +
> + platform_set_drvdata(pdev, host);
> +
> + host_version = readw_relaxed((host->ioaddr + SDHCI_HOST_VERSION));
> +
> + dev_info(&pdev->dev, "SDHCI ST Initialised: Host Version: 0x%x Vendor Version 0x%x\n",
> + ((host_version & SDHCI_SPEC_VER_MASK) >> SDHCI_SPEC_VER_SHIFT),
> + ((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);
> +
> + clk_disable_unprepare(pltfm_host->clk);
> +
> + return sdhci_pltfm_unregister(pdev);
> +}
> +
> +#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);
> + int ret = sdhci_suspend_host(host);
> +
> + if (ret)
> + goto out;
> +
> + 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);
> +
> + clk_prepare_enable(pltfm_host->clk);
> +
> + return sdhci_resume_host(host);
> +}
> +#endif
> +
> +static SIMPLE_DEV_PM_OPS(sdhci_st_pmops, sdhci_st_suspend, sdhci_st_resume);
> +
> +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",
> + .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.cavallaro at st.com>");
> +MODULE_LICENSE("GPL v2");
> +MODULE_ALIAS("platform:st-sdhci");
> --
> 1.9.1
>
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