drivers/mmc/host/sdhci-spear.c - kernel/lockdown - Git at Google

 /*
  * drivers/mmc/host/sdhci-spear.c
  *
  * Support of SDHCI platform devices for spear soc family
  *
  * Copyright (C) 2010 ST Microelectronics
  * Viresh Kumar <viresh.linux@gmail.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/module.h>
 #include <linux/interrupt.h>
 #include <linux/irq.h>
 #include <linux/of.h>
 #include <linux/of_gpio.h>
 #include <linux/platform_device.h>
 #include <linux/pm.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 const 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;
 	irq_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;
 }

 #ifdef CONFIG_OF
 static struct sdhci_plat_data *sdhci_probe_config_dt(struct platform_device *pdev)
 {
 	struct device_node *np = pdev->dev.of_node;
 	struct sdhci_plat_data *pdata = NULL;
 	int cd_gpio;

 	cd_gpio = of_get_named_gpio(np, "cd-gpios", 0);
 	if (!gpio_is_valid(cd_gpio))
 		cd_gpio = -1;

 	/* If pdata is required */
 	if (cd_gpio != -1) {
 		pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
 		if (!pdata) {
 			dev_err(&pdev->dev, "DT: kzalloc failed\n");
 			return ERR_PTR(-ENOMEM);
 		}
 	}

 	pdata->card_int_gpio = cd_gpio;

 	return pdata;
 }
 #else
 static struct sdhci_plat_data *sdhci_probe_config_dt(struct platform_device *pdev)
 {
 	return ERR_PTR(-ENOSYS);
 }
 #endif

 static int sdhci_probe(struct platform_device *pdev)
 {
 	struct device_node *np = pdev->dev.of_node;
 	struct sdhci_host *host;
 	struct resource *iomem;
 	struct spear_sdhci *sdhci;
 	int ret;

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

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

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

 	/* 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;
 	}

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

 	ret = clk_set_rate(sdhci->clk, 50000000);
 	if (ret)
 		dev_dbg(&pdev->dev, "Error setting desired clk, clk=%lu\n",
 				clk_get_rate(sdhci->clk));

 	if (np) {
 		sdhci->data = sdhci_probe_config_dt(pdev);
 		if (IS_ERR(sdhci->data)) {
 			dev_err(&pdev->dev, "DT: Failed to get pdata\n");
 			return -ENODEV;
 		}
 	} else {
 		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 disable_clk;
 	}

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

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

 	ret = sdhci_add_host(host);
 	if (ret) {
 		dev_dbg(&pdev->dev, "error adding host\n");
 		goto free_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 = devm_gpio_request(&pdev->dev,
 				sdhci->data->card_power_gpio, "sdhci");
 		if (ret < 0) {
 			dev_dbg(&pdev->dev, "gpio request fail: %d\n",
 					sdhci->data->card_power_gpio);
 			goto set_drvdata;
 		}

 		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 set_drvdata;
 		}
 	}

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

 		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 set_drvdata;
 		}
 		ret = devm_request_irq(&pdev->dev,
 				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 set_drvdata;
 		}

 	}

 	return 0;

 set_drvdata:
 	sdhci_remove_host(host, 1);
 free_host:
 	sdhci_free_host(host);
 disable_clk:
 	clk_disable_unprepare(sdhci->clk);
 put_clk:
 	clk_put(sdhci->clk);
 err:
 	dev_err(&pdev->dev, "spear-sdhci probe failed: %d\n", ret);
 	return ret;
 }

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

 	scratch = readl(host->ioaddr + SDHCI_INT_STATUS);
 	if (scratch == (u32)-1)
 		dead = 1;

 	sdhci_remove_host(host, dead);
 	sdhci_free_host(host);
 	clk_disable_unprepare(sdhci->clk);
 	clk_put(sdhci->clk);

 	return 0;
 }

 #ifdef CONFIG_PM_SLEEP
 static int sdhci_suspend(struct device *dev)
 {
 	struct sdhci_host *host = dev_get_drvdata(dev);
 	struct spear_sdhci *sdhci = dev_get_platdata(dev);
 	int ret;

 	ret = sdhci_suspend_host(host);
 	if (!ret)
 		clk_disable(sdhci->clk);

 	return ret;
 }

 static int sdhci_resume(struct device *dev)
 {
 	struct sdhci_host *host = dev_get_drvdata(dev);
 	struct spear_sdhci *sdhci = dev_get_platdata(dev);
 	int ret;

 	ret = clk_enable(sdhci->clk);
 	if (ret) {
 		dev_dbg(dev, "Resume: Error enabling clock\n");
 		return ret;
 	}

 	return sdhci_resume_host(host);
 }
 #endif

 static SIMPLE_DEV_PM_OPS(sdhci_pm_ops, sdhci_suspend, sdhci_resume);

 #ifdef CONFIG_OF
 static const struct of_device_id sdhci_spear_id_table[] = {
 	{ .compatible = "st,spear300-sdhci" },
 	{}
 };
 MODULE_DEVICE_TABLE(of, sdhci_spear_id_table);
 #endif

 static struct platform_driver sdhci_driver = {
 	.driver = {
 		.name	= "sdhci",
 		.owner	= THIS_MODULE,
 		.pm	= &sdhci_pm_ops,
 		.of_match_table = of_match_ptr(sdhci_spear_id_table),
 	},
 	.probe		= sdhci_probe,
 	.remove		= sdhci_remove,
 };

 module_platform_driver(sdhci_driver);

 MODULE_DESCRIPTION("SPEAr Secure Digital Host Controller Interface driver");
 MODULE_AUTHOR("Viresh Kumar <viresh.linux@gmail.com>");
 MODULE_LICENSE("GPL v2");
	/*
	* drivers/mmc/host/sdhci-spear.c
	*
	* Support of SDHCI platform devices for spear soc family
	*
	* Copyright (C) 2010 ST Microelectronics
	* Viresh Kumar <viresh.linux@gmail.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/module.h>
	#include <linux/interrupt.h>
	#include <linux/irq.h>
	#include <linux/of.h>
	#include <linux/of_gpio.h>
	#include <linux/platform_device.h>
	#include <linux/pm.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 const 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;
	irq_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;
	}

	#ifdef CONFIG_OF
	static struct sdhci_plat_data sdhci_probe_config_dt(struct platform_device pdev)
	{
	struct device_node *np = pdev->dev.of_node;
	struct sdhci_plat_data *pdata = NULL;
	int cd_gpio;

	cd_gpio = of_get_named_gpio(np, "cd-gpios", 0);
	if (!gpio_is_valid(cd_gpio))
	cd_gpio = -1;

	/* If pdata is required */
	if (cd_gpio != -1) {
	pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
	if (!pdata) {
	dev_err(&pdev->dev, "DT: kzalloc failed\n");
	return ERR_PTR(-ENOMEM);
	}
	}

	pdata->card_int_gpio = cd_gpio;

	return pdata;
	}
	#else
	static struct sdhci_plat_data sdhci_probe_config_dt(struct platform_device pdev)
	{
	return ERR_PTR(-ENOSYS);
	}
	#endif

	static int sdhci_probe(struct platform_device *pdev)
	{
	struct device_node *np = pdev->dev.of_node;
	struct sdhci_host *host;
	struct resource *iomem;
	struct spear_sdhci *sdhci;
	int ret;

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

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

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

	/* 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;
	}

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

	ret = clk_set_rate(sdhci->clk, 50000000);
	if (ret)
	dev_dbg(&pdev->dev, "Error setting desired clk, clk=%lu\n",
	clk_get_rate(sdhci->clk));

	if (np) {
	sdhci->data = sdhci_probe_config_dt(pdev);
	if (IS_ERR(sdhci->data)) {
	dev_err(&pdev->dev, "DT: Failed to get pdata\n");
	return -ENODEV;
	}
	} else {
	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 disable_clk;
	}

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

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

	ret = sdhci_add_host(host);
	if (ret) {
	dev_dbg(&pdev->dev, "error adding host\n");
	goto free_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 = devm_gpio_request(&pdev->dev,
	sdhci->data->card_power_gpio, "sdhci");
	if (ret < 0) {
	dev_dbg(&pdev->dev, "gpio request fail: %d\n",
	sdhci->data->card_power_gpio);
	goto set_drvdata;
	}

	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 set_drvdata;
	}
	}

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

	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 set_drvdata;
	}
	ret = devm_request_irq(&pdev->dev,
	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 set_drvdata;
	}

	}

	return 0;

	set_drvdata:
	sdhci_remove_host(host, 1);
	free_host:
	sdhci_free_host(host);
	disable_clk:
	clk_disable_unprepare(sdhci->clk);
	put_clk:
	clk_put(sdhci->clk);
	err:
	dev_err(&pdev->dev, "spear-sdhci probe failed: %d\n", ret);
	return ret;
	}

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

	scratch = readl(host->ioaddr + SDHCI_INT_STATUS);
	if (scratch == (u32)-1)
	dead = 1;

	sdhci_remove_host(host, dead);
	sdhci_free_host(host);
	clk_disable_unprepare(sdhci->clk);
	clk_put(sdhci->clk);

	return 0;
	}

	#ifdef CONFIG_PM_SLEEP
	static int sdhci_suspend(struct device *dev)
	{
	struct sdhci_host *host = dev_get_drvdata(dev);
	struct spear_sdhci *sdhci = dev_get_platdata(dev);
	int ret;

	ret = sdhci_suspend_host(host);
	if (!ret)
	clk_disable(sdhci->clk);

	return ret;
	}

	static int sdhci_resume(struct device *dev)
	{
	struct sdhci_host *host = dev_get_drvdata(dev);
	struct spear_sdhci *sdhci = dev_get_platdata(dev);
	int ret;

	ret = clk_enable(sdhci->clk);
	if (ret) {
	dev_dbg(dev, "Resume: Error enabling clock\n");
	return ret;
	}

	return sdhci_resume_host(host);
	}
	#endif

	static SIMPLE_DEV_PM_OPS(sdhci_pm_ops, sdhci_suspend, sdhci_resume);

	#ifdef CONFIG_OF
	static const struct of_device_id sdhci_spear_id_table[] = {
	{ .compatible = "st,spear300-sdhci" },
	{}
	};
	MODULE_DEVICE_TABLE(of, sdhci_spear_id_table);
	#endif

	static struct platform_driver sdhci_driver = {
	.driver = {
	.name = "sdhci",
	.owner = THIS_MODULE,
	.pm = &sdhci_pm_ops,
	.of_match_table = of_match_ptr(sdhci_spear_id_table),
	},
	.probe = sdhci_probe,
	.remove = sdhci_remove,
	};

	module_platform_driver(sdhci_driver);

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