sdhci-spear: ST SPEAr based SDHCI controller glue (c63b3cba) · Commits · 戴 / test

MAINTAINERS

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Original line number	Diff line number	Diff line
		@@ -5004,6 +5004,12 @@ L: linux-mmc@vger.kernel.org
		S: Maintained
		F: drivers/mmc/host/sdhci-s3c.c

		SECURE DIGITAL HOST CONTROLLER INTERFACE (SDHCI) ST SPEAR DRIVER
		M: Viresh Kumar <viresh.kumar@st.com>
		L: linux-mmc@vger.kernel.org
		S: Maintained
		F: drivers/mmc/host/sdhci-spear.c

		SECURITY SUBSYSTEM
		M: James Morris <jmorris@namei.org>
		L: linux-security-module@vger.kernel.org (suggested Cc:)

drivers/mmc/host/Kconfig

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		@@ -136,6 +136,18 @@ config MMC_SDHCI_S3C

		If unsure, say N.

		config MMC_SDHCI_SPEAR
		tristate "SDHCI support on ST SPEAr platform"
		depends on MMC_SDHCI && PLAT_SPEAR
		help
		This selects the Secure Digital Host Controller Interface (SDHCI)
		often referrered to as the HSMMC block in some of the ST SPEAR range
		of SoC

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

		If unsure, say N.

		config MMC_SDHCI_S3C_DMA
		bool "DMA support on S3C SDHCI"
		depends on MMC_SDHCI_S3C && EXPERIMENTAL

drivers/mmc/host/Makefile

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		@@ -14,6 +14,7 @@ obj-$(CONFIG_MMC_SDHCI) += sdhci.o
		obj-$(CONFIG_MMC_SDHCI_PCI) += sdhci-pci.o
		obj-$(CONFIG_MMC_SDHCI_PLTFM) += sdhci-pltfm.o
		obj-$(CONFIG_MMC_SDHCI_S3C) += sdhci-s3c.o
		obj-$(CONFIG_MMC_SDHCI_SPEAR) += sdhci-spear.o
		obj-$(CONFIG_MMC_WBSD) += wbsd.o
		obj-$(CONFIG_MMC_AU1X) += au1xmmc.o
		obj-$(CONFIG_MMC_OMAP) += omap.o

drivers/mmc/host/sdhci-spear.c

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Original line number	Diff line number	Diff line
		/*
		* drivers/mmc/host/sdhci-spear.c
		*
		* Support of SDHCI platform devices for spear soc family
		*
		* Copyright (C) 2010 ST Microelectronics
		* Viresh Kumar<viresh.kumar@st.com>
		*
		* Inspired by sdhci-pltfm.c
		*
		* This file is licensed under the terms of the GNU General Public
		* License version 2. This program is licensed "as is" without any
		* warranty of any kind, whether express or implied.
		*/

		#include <linux/clk.h>
		#include <linux/delay.h>
		#include <linux/gpio.h>
		#include <linux/highmem.h>
		#include <linux/interrupt.h>
		#include <linux/irq.h>
		#include <linux/platform_device.h>
		#include <linux/slab.h>
		#include <linux/mmc/host.h>
		#include <linux/mmc/sdhci-spear.h>
		#include <linux/io.h>
		#include "sdhci.h"

		struct spear_sdhci {
		struct clk *clk;
		struct sdhci_plat_data *data;
		};

		/* sdhci ops */
		static struct sdhci_ops sdhci_pltfm_ops = {
		/* Nothing to do for now. */
		};

		/* gpio card detection interrupt handler */
		static irqreturn_t sdhci_gpio_irq(int irq, void *dev_id)
		{
		struct platform_device *pdev = dev_id;
		struct sdhci_host *host = platform_get_drvdata(pdev);
		struct spear_sdhci *sdhci = dev_get_platdata(&pdev->dev);
		unsigned long gpio_irq_type;
		int val;

		val = gpio_get_value(sdhci->data->card_int_gpio);

		/* val == 1 -> card removed, val == 0 -> card inserted */
		/* if card removed - set irq for low level, else vice versa */
		gpio_irq_type = val ? IRQF_TRIGGER_LOW : IRQF_TRIGGER_HIGH;
		set_irq_type(irq, gpio_irq_type);

		if (sdhci->data->card_power_gpio >= 0) {
		if (!sdhci->data->power_always_enb) {
		/* if card inserted, give power, otherwise remove it */
		val = sdhci->data->power_active_high ? !val : val ;
		gpio_set_value(sdhci->data->card_power_gpio, val);
		}
		}

		/* inform sdhci driver about card insertion/removal */
		tasklet_schedule(&host->card_tasklet);

		return IRQ_HANDLED;
		}

		static int __devinit sdhci_probe(struct platform_device *pdev)
		{
		struct sdhci_host *host;
		struct resource *iomem;
		struct spear_sdhci *sdhci;
		int ret;

		BUG_ON(pdev == NULL);

		iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
		if (!iomem) {
		ret = -ENOMEM;
		dev_dbg(&pdev->dev, "memory resource not defined\n");
		goto err;
		}

		if (!request_mem_region(iomem->start, resource_size(iomem),
		"spear-sdhci")) {
		ret = -EBUSY;
		dev_dbg(&pdev->dev, "cannot request region\n");
		goto err;
		}

		sdhci = kzalloc(sizeof(*sdhci), GFP_KERNEL);
		if (!sdhci) {
		ret = -ENOMEM;
		dev_dbg(&pdev->dev, "cannot allocate memory for sdhci\n");
		goto err_kzalloc;
		}

		/* clk enable */
		sdhci->clk = clk_get(&pdev->dev, NULL);
		if (IS_ERR(sdhci->clk)) {
		ret = PTR_ERR(sdhci->clk);
		dev_dbg(&pdev->dev, "Error getting clock\n");
		goto err_clk_get;
		}

		ret = clk_enable(sdhci->clk);
		if (ret) {
		dev_dbg(&pdev->dev, "Error enabling clock\n");
		goto err_clk_enb;
		}

		/* overwrite platform_data */
		sdhci->data = dev_get_platdata(&pdev->dev);
		pdev->dev.platform_data = sdhci;

		if (pdev->dev.parent)
		host = sdhci_alloc_host(pdev->dev.parent, 0);
		else
		host = sdhci_alloc_host(&pdev->dev, 0);

		if (IS_ERR(host)) {
		ret = PTR_ERR(host);
		dev_dbg(&pdev->dev, "error allocating host\n");
		goto err_alloc_host;
		}

		host->hw_name = "sdhci";
		host->ops = &sdhci_pltfm_ops;
		host->irq = platform_get_irq(pdev, 0);
		host->quirks = SDHCI_QUIRK_BROKEN_ADMA;

		host->ioaddr = ioremap(iomem->start, resource_size(iomem));
		if (!host->ioaddr) {
		ret = -ENOMEM;
		dev_dbg(&pdev->dev, "failed to remap registers\n");
		goto err_ioremap;
		}

		ret = sdhci_add_host(host);
		if (ret) {
		dev_dbg(&pdev->dev, "error adding host\n");
		goto err_add_host;
		}

		platform_set_drvdata(pdev, host);

		/*
		* It is optional to use GPIOs for sdhci Power control & sdhci card
		* interrupt detection. If sdhci->data is NULL, then use original sdhci
		* lines otherwise GPIO lines.
		* If GPIO is selected for power control, then power should be disabled
		* after card removal and should be enabled when card insertion
		* interrupt occurs
		*/
		if (!sdhci->data)
		return 0;

		if (sdhci->data->card_power_gpio >= 0) {
		int val = 0;

		ret = gpio_request(sdhci->data->card_power_gpio, "sdhci");
		if (ret < 0) {
		dev_dbg(&pdev->dev, "gpio request fail: %d\n",
		sdhci->data->card_power_gpio);
		goto err_pgpio_request;
		}

		if (sdhci->data->power_always_enb)
		val = sdhci->data->power_active_high;
		else
		val = !sdhci->data->power_active_high;

		ret = gpio_direction_output(sdhci->data->card_power_gpio, val);
		if (ret) {
		dev_dbg(&pdev->dev, "gpio set direction fail: %d\n",
		sdhci->data->card_power_gpio);
		goto err_pgpio_direction;
		}

		gpio_set_value(sdhci->data->card_power_gpio, 1);
		}

		if (sdhci->data->card_int_gpio >= 0) {
		ret = gpio_request(sdhci->data->card_int_gpio, "sdhci");
		if (ret < 0) {
		dev_dbg(&pdev->dev, "gpio request fail: %d\n",
		sdhci->data->card_int_gpio);
		goto err_igpio_request;
		}

		ret = gpio_direction_input(sdhci->data->card_int_gpio);
		if (ret) {
		dev_dbg(&pdev->dev, "gpio set direction fail: %d\n",
		sdhci->data->card_int_gpio);
		goto err_igpio_direction;
		}
		ret = request_irq(gpio_to_irq(sdhci->data->card_int_gpio),
		sdhci_gpio_irq, IRQF_TRIGGER_LOW,
		mmc_hostname(host->mmc), pdev);
		if (ret) {
		dev_dbg(&pdev->dev, "gpio request irq fail: %d\n",
		sdhci->data->card_int_gpio);
		goto err_igpio_request_irq;
		}

		}

		return 0;

		err_igpio_request_irq:
		err_igpio_direction:
		if (sdhci->data->card_int_gpio >= 0)
		gpio_free(sdhci->data->card_int_gpio);
		err_igpio_request:
		err_pgpio_direction:
		if (sdhci->data->card_power_gpio >= 0)
		gpio_free(sdhci->data->card_power_gpio);
		err_pgpio_request:
		platform_set_drvdata(pdev, NULL);
		sdhci_remove_host(host, 1);
		err_add_host:
		iounmap(host->ioaddr);
		err_ioremap:
		sdhci_free_host(host);
		err_alloc_host:
		clk_disable(sdhci->clk);
		err_clk_enb:
		clk_put(sdhci->clk);
		err_clk_get:
		kfree(sdhci);
		err_kzalloc:
		release_mem_region(iomem->start, resource_size(iomem));
		err:
		dev_err(&pdev->dev, "spear-sdhci probe failed: %d\n", ret);
		return ret;
		}

		static int __devexit sdhci_remove(struct platform_device *pdev)
		{
		struct sdhci_host *host = platform_get_drvdata(pdev);
		struct resource *iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
		struct spear_sdhci *sdhci = dev_get_platdata(&pdev->dev);
		int dead;
		u32 scratch;

		if (sdhci->data) {
		if (sdhci->data->card_int_gpio >= 0) {
		free_irq(gpio_to_irq(sdhci->data->card_int_gpio), pdev);
		gpio_free(sdhci->data->card_int_gpio);
		}

		if (sdhci->data->card_power_gpio >= 0)
		gpio_free(sdhci->data->card_power_gpio);
		}

		platform_set_drvdata(pdev, NULL);
		dead = 0;
		scratch = readl(host->ioaddr + SDHCI_INT_STATUS);
		if (scratch == (u32)-1)
		dead = 1;

		sdhci_remove_host(host, dead);
		iounmap(host->ioaddr);
		sdhci_free_host(host);
		clk_disable(sdhci->clk);
		clk_put(sdhci->clk);
		kfree(sdhci);
		if (iomem)
		release_mem_region(iomem->start, resource_size(iomem));

		return 0;
		}

		static struct platform_driver sdhci_driver = {
		.driver = {
		.name = "sdhci",
		.owner = THIS_MODULE,
		},
		.probe = sdhci_probe,
		.remove = __devexit_p(sdhci_remove),
		};

		static int __init sdhci_init(void)
		{
		return platform_driver_register(&sdhci_driver);
		}
		module_init(sdhci_init);

		static void __exit sdhci_exit(void)
		{
		platform_driver_unregister(&sdhci_driver);
		}
		module_exit(sdhci_exit);

		MODULE_DESCRIPTION("SPEAr Secure Digital Host Controller Interface driver");
		MODULE_AUTHOR("Viresh Kumar <viresh.kumar@st.com>");
		MODULE_LICENSE("GPL v2");

include/linux/mmc/sdhci-spear.h

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		/*
		* include/linux/mmc/sdhci-spear.h
		*
		* SDHCI declarations specific to ST SPEAr platform
		*
		* Copyright (C) 2010 ST Microelectronics
		* Viresh Kumar<viresh.kumar@st.com>
		*
		* This file is licensed under the terms of the GNU General Public
		* License version 2. This program is licensed "as is" without any
		* warranty of any kind, whether express or implied.
		*/

		#ifndef MMC_SDHCI_SPEAR_H
		#define MMC_SDHCI_SPEAR_H

		#include <linux/platform_device.h>
		/*
		* struct sdhci_plat_data: spear sdhci platform data structure
		*
		* @card_power_gpio: gpio pin for enabling/disabling power to sdhci socket
		* @power_active_high: if set, enable power to sdhci socket by setting
		* card_power_gpio
		* @power_always_enb: If set, then enable power on probe, otherwise enable only
		* on card insertion and disable on card removal.
		* card_int_gpio: gpio pin used for card detection
		*/
		struct sdhci_plat_data {
		int card_power_gpio;
		int power_active_high;
		int power_always_enb;
		int card_int_gpio;
		};

		/* This function is used to set platform_data field of pdev->dev */
		static inline void
		sdhci_set_plat_data(struct platform_device pdev, struct sdhci_plat_data data)
		{
		pdev->dev.platform_data = data;
		}

		#endif /* MMC_SDHCI_SPEAR_H */

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