mmc: sdhci-st: Intial support for ST SDHCI controller (f52d9c4f) · Commits · 戴 / test

drivers/mmc/host/Kconfig

+12 −0

Original line number	Diff line number	Diff line
		@@ -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

drivers/mmc/host/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -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

drivers/mmc/host/sdhci-st.c

0 → 100644

+176 −0

Original line number	Diff line number	Diff line
		/*
		* Support for SDHCI on STMicroelectronics SoCs
		*
		* Copyright (C) 2014 STMicroelectronics Ltd
		* Author: Giuseppe Cavallaro <peppe.cavallaro@st.com>
		* Contributors: Peter Griffin <peter.griffin@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@st.com>");
		MODULE_LICENSE("GPL v2");
		MODULE_ALIAS("platform:st-sdhci");

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