mmc: arasan: Add driver for Arasan SDHCI (e3ec3a3d) · Commits · e / devices / android_kernel_teracube_2e

Documentation/devicetree/bindings/mmc/arasan,sdhci.txt

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		Device Tree Bindings for the Arasan SDHCI Controller

		The bindings follow the mmc[1], clock[2] and interrupt[3] bindings. Only
		deviations are documented here.

		[1] Documentation/devicetree/bindings/mmc/mmc.txt
		[2] Documentation/devicetree/bindings/clock/clock-bindings.txt
		[3] Documentation/devicetree/bindings/interrupt-controller/interrupts.txt

		Required Properties:
		- compatible: Compatibility string. Must be 'arasan,sdhci-8.9a'
		- reg: From mmc bindings: Register location and length.
		- clocks: From clock bindings: Handles to clock inputs.
		- clock-names: From clock bindings: Tuple including "clk_xin" and "clk_ahb"
		- interrupts: Interrupt specifier
		- interrupt-parent: Phandle for the interrupt controller that services
		interrupts for this device.

		Example:
		sdhci@e0100000 {
		compatible = "arasan,sdhci-8.9a";
		reg = <0xe0100000 0x1000>;
		clock-names = "clk_xin", "clk_ahb";
		clocks = <&clkc 21>, <&clkc 32>;
		interrupt-parent = <&gic>;
		interrupts = <0 24 4>;
		} ;

MAINTAINERS

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		@@ -1371,6 +1371,7 @@ T: git git://git.xilinx.com/linux-xlnx.git
		S: Supported
		F: arch/arm/mach-zynq/
		F: drivers/cpuidle/cpuidle-zynq.c
		F: drivers/mmc/host/sdhci-of-arasan.c

		ARM SMMU DRIVER
		M: Will Deacon <will.deacon@arm.com>

drivers/mmc/host/Kconfig

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		@@ -104,6 +104,18 @@ config MMC_SDHCI_PLTFM

		If unsure, say N.

		config MMC_SDHCI_OF_ARASAN
		tristate "SDHCI OF support for the Arasan SDHCI controllers"
		depends on MMC_SDHCI_PLTFM
		depends on OF
		help
		This selects the Arasan Secure Digital Host Controller Interface
		(SDHCI). This hardware is found e.g. in Xilinx' Zynq SoC.

		If you have a controller with this interface, say Y or M here.

		If unsure, say N.

		config MMC_SDHCI_OF_ESDHC
		tristate "SDHCI OF support for the Freescale eSDHC controller"
		depends on MMC_SDHCI_PLTFM

drivers/mmc/host/Makefile

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		@@ -59,6 +59,7 @@ obj-$(CONFIG_MMC_SDHCI_CNS3XXX) += sdhci-cns3xxx.o
		obj-$(CONFIG_MMC_SDHCI_ESDHC_IMX) += sdhci-esdhc-imx.o
		obj-$(CONFIG_MMC_SDHCI_DOVE) += sdhci-dove.o
		obj-$(CONFIG_MMC_SDHCI_TEGRA) += sdhci-tegra.o
		obj-$(CONFIG_MMC_SDHCI_OF_ARASAN) += sdhci-of-arasan.o
		obj-$(CONFIG_MMC_SDHCI_OF_ESDHC) += sdhci-of-esdhc.o
		obj-$(CONFIG_MMC_SDHCI_OF_HLWD) += sdhci-of-hlwd.o
		obj-$(CONFIG_MMC_SDHCI_BCM_KONA) += sdhci-bcm-kona.o

drivers/mmc/host/sdhci-of-arasan.c

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		/*
		* Arasan Secure Digital Host Controller Interface.
		* Copyright (C) 2011 - 2012 Michal Simek <monstr@monstr.eu>
		* Copyright (c) 2012 Wind River Systems, Inc.
		* Copyright (C) 2013 Pengutronix e.K.
		* Copyright (C) 2013 Xilinx Inc.
		*
		* Based on sdhci-of-esdhc.c
		*
		* Copyright (c) 2007 Freescale Semiconductor, Inc.
		* Copyright (c) 2009 MontaVista Software, Inc.
		*
		* Authors: Xiaobo Xie <X.Xie@freescale.com>
		* Anton Vorontsov <avorontsov@ru.mvista.com>
		*
		* This program is free software; you can redistribute it and/or modify
		* it under the terms of the GNU General Public License as published by
		* the Free Software Foundation; either version 2 of the License, or (at
		* your option) any later version.
		*/

		#include <linux/module.h>
		#include "sdhci-pltfm.h"

		#define SDHCI_ARASAN_CLK_CTRL_OFFSET 0x2c

		#define CLK_CTRL_TIMEOUT_SHIFT 16
		#define CLK_CTRL_TIMEOUT_MASK (0xf << CLK_CTRL_TIMEOUT_SHIFT)
		#define CLK_CTRL_TIMEOUT_MIN_EXP 13

		/**
		* struct sdhci_arasan_data
		* @clk_ahb: Pointer to the AHB clock
		*/
		struct sdhci_arasan_data {
		struct clk *clk_ahb;
		};

		static unsigned int sdhci_arasan_get_timeout_clock(struct sdhci_host *host)
		{
		u32 div;
		unsigned long freq;
		struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);

		div = readl(host->ioaddr + SDHCI_ARASAN_CLK_CTRL_OFFSET);
		div = (div & CLK_CTRL_TIMEOUT_MASK) >> CLK_CTRL_TIMEOUT_SHIFT;

		freq = clk_get_rate(pltfm_host->clk);
		freq /= 1 << (CLK_CTRL_TIMEOUT_MIN_EXP + div);

		return freq;
		}

		static struct sdhci_ops sdhci_arasan_ops = {
		.get_max_clock = sdhci_pltfm_clk_get_max_clock,
		.get_timeout_clock = sdhci_arasan_get_timeout_clock,
		};

		static struct sdhci_pltfm_data sdhci_arasan_pdata = {
		.ops = &sdhci_arasan_ops,
		};

		#ifdef CONFIG_PM_SLEEP
		/**
		* sdhci_arasan_suspend - Suspend method for the driver
		* @dev: Address of the device structure
		* Returns 0 on success and error value on error
		*
		* Put the device in a low power state.
		*/
		static int sdhci_arasan_suspend(struct device *dev)
		{
		struct platform_device *pdev = to_platform_device(dev);
		struct sdhci_host *host = platform_get_drvdata(pdev);
		struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
		struct sdhci_arasan_data *sdhci_arasan = pltfm_host->priv;
		int ret;

		ret = sdhci_suspend_host(host);
		if (ret)
		return ret;

		clk_disable(pltfm_host->clk);
		clk_disable(sdhci_arasan->clk_ahb);

		return 0;
		}

		/**
		* sdhci_arasan_resume - Resume method for the driver
		* @dev: Address of the device structure
		* Returns 0 on success and error value on error
		*
		* Resume operation after suspend
		*/
		static int sdhci_arasan_resume(struct device *dev)
		{
		struct platform_device *pdev = to_platform_device(dev);
		struct sdhci_host *host = platform_get_drvdata(pdev);
		struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
		struct sdhci_arasan_data *sdhci_arasan = pltfm_host->priv;
		int ret;

		ret = clk_enable(sdhci_arasan->clk_ahb);
		if (ret) {
		dev_err(dev, "Cannot enable AHB clock.\n");
		return ret;
		}

		ret = clk_enable(pltfm_host->clk);
		if (ret) {
		dev_err(dev, "Cannot enable SD clock.\n");
		clk_disable(sdhci_arasan->clk_ahb);
		return ret;
		}

		return sdhci_resume_host(host);
		}
		#endif /* ! CONFIG_PM_SLEEP */

		static SIMPLE_DEV_PM_OPS(sdhci_arasan_dev_pm_ops, sdhci_arasan_suspend,
		sdhci_arasan_resume);

		static int sdhci_arasan_probe(struct platform_device *pdev)
		{
		int ret;
		struct clk *clk_xin;
		struct sdhci_host *host;
		struct sdhci_pltfm_host *pltfm_host;
		struct sdhci_arasan_data *sdhci_arasan;

		sdhci_arasan = devm_kzalloc(&pdev->dev, sizeof(*sdhci_arasan),
		GFP_KERNEL);
		if (!sdhci_arasan)
		return -ENOMEM;

		sdhci_arasan->clk_ahb = devm_clk_get(&pdev->dev, "clk_ahb");
		if (IS_ERR(sdhci_arasan->clk_ahb)) {
		dev_err(&pdev->dev, "clk_ahb clock not found.\n");
		return PTR_ERR(sdhci_arasan->clk_ahb);
		}

		clk_xin = devm_clk_get(&pdev->dev, "clk_xin");
		if (IS_ERR(clk_xin)) {
		dev_err(&pdev->dev, "clk_xin clock not found.\n");
		return PTR_ERR(clk_xin);
		}

		ret = clk_prepare_enable(sdhci_arasan->clk_ahb);
		if (ret) {
		dev_err(&pdev->dev, "Unable to enable AHB clock.\n");
		return ret;
		}

		ret = clk_prepare_enable(clk_xin);
		if (ret) {
		dev_err(&pdev->dev, "Unable to enable SD clock.\n");
		goto clk_dis_ahb;
		}

		host = sdhci_pltfm_init(pdev, &sdhci_arasan_pdata, 0);
		if (IS_ERR(host)) {
		ret = PTR_ERR(host);
		dev_err(&pdev->dev, "platform init failed (%u)\n", ret);
		goto clk_disable_all;
		}

		sdhci_get_of_property(pdev);
		pltfm_host = sdhci_priv(host);
		pltfm_host->priv = sdhci_arasan;
		pltfm_host->clk = clk_xin;

		ret = sdhci_add_host(host);
		if (ret) {
		dev_err(&pdev->dev, "platform register failed (%u)\n", ret);
		goto err_pltfm_free;
		}

		return 0;

		err_pltfm_free:
		sdhci_pltfm_free(pdev);
		clk_disable_all:
		clk_disable_unprepare(clk_xin);
		clk_dis_ahb:
		clk_disable_unprepare(sdhci_arasan->clk_ahb);

		return ret;
		}

		static int sdhci_arasan_remove(struct platform_device *pdev)
		{
		struct sdhci_host *host = platform_get_drvdata(pdev);
		struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
		struct sdhci_arasan_data *sdhci_arasan = pltfm_host->priv;

		clk_disable_unprepare(pltfm_host->clk);
		clk_disable_unprepare(sdhci_arasan->clk_ahb);

		return sdhci_pltfm_unregister(pdev);
		}

		static const struct of_device_id sdhci_arasan_of_match[] = {
		{ .compatible = "arasan,sdhci-8.9a" },
		{ }
		};
		MODULE_DEVICE_TABLE(of, sdhci_arasan_of_match);

		static struct platform_driver sdhci_arasan_driver = {
		.driver = {
		.name = "sdhci-arasan",
		.owner = THIS_MODULE,
		.of_match_table = sdhci_arasan_of_match,
		.pm = &sdhci_arasan_dev_pm_ops,
		},
		.probe = sdhci_arasan_probe,
		.remove = sdhci_arasan_remove,
		};

		module_platform_driver(sdhci_arasan_driver);

		MODULE_DESCRIPTION("Driver for the Arasan SDHCI Controller");
		MODULE_AUTHOR("Soeren Brinkmann <soren.brinkmann@xilinx.com>");
		MODULE_LICENSE("GPL");