[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / mmc / host / sdhci-spear.c

/*
 * 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/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 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;
}

static int __devinit sdhci_probe(struct platform_device *pdev)
{
	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_enable(sdhci->clk);
	if (ret) {
		dev_dbg(&pdev->dev, "Error enabling clock\n");
		goto put_clk;
	}

	/* 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 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:
	platform_set_drvdata(pdev, NULL);
	sdhci_remove_host(host, 1);
free_host:
	sdhci_free_host(host);
disable_clk:
	clk_disable(sdhci->clk);
put_clk:
	clk_put(sdhci->clk);
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 spear_sdhci *sdhci = dev_get_platdata(&pdev->dev);
	int dead = 0;
	u32 scratch;

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

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

	return 0;
}

#ifdef CONFIG_PM
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);

static struct platform_driver sdhci_driver = {
	.driver = {
		.name	= "sdhci",
		.owner	= THIS_MODULE,
		.pm	= &sdhci_pm_ops,
	},
	.probe		= sdhci_probe,
	.remove		= __devexit_p(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");
Commit	Line	Data
c63b3cba VK	1	/*
	2	* drivers/mmc/host/sdhci-spear.c
	3	*
	4	* Support of SDHCI platform devices for spear soc family
	5	*
	6	* Copyright (C) 2010 ST Microelectronics
10d8935f	7	* Viresh Kumar <viresh.linux@gmail.com>
c63b3cba VK	8	*
	9	* Inspired by sdhci-pltfm.c
	10	*
	11	* This file is licensed under the terms of the GNU General Public
	12	* License version 2. This program is licensed "as is" without any
	13	* warranty of any kind, whether express or implied.
	14	*/
	15
	16	#include <linux/clk.h>
	17	#include <linux/delay.h>
	18	#include <linux/gpio.h>
	19	#include <linux/highmem.h>
88b47679	20	#include <linux/module.h>
c63b3cba VK	21	#include <linux/interrupt.h>
	22	#include <linux/irq.h>
	23	#include <linux/platform_device.h>
b70a7fab	24	#include <linux/pm.h>
c63b3cba VK	25	#include <linux/slab.h>
	26	#include <linux/mmc/host.h>
	27	#include <linux/mmc/sdhci-spear.h>
	28	#include <linux/io.h>
	29	#include "sdhci.h"
	30
	31	struct spear_sdhci {
	32	struct clk *clk;
	33	struct sdhci_plat_data *data;
	34	};
	35
	36	/* sdhci ops */
	37	static struct sdhci_ops sdhci_pltfm_ops = {
	38	/* Nothing to do for now. */
	39	};
	40
	41	/* gpio card detection interrupt handler */
	42	static irqreturn_t sdhci_gpio_irq(int irq, void *dev_id)
	43	{
	44	struct platform_device *pdev = dev_id;
	45	struct sdhci_host *host = platform_get_drvdata(pdev);
	46	struct spear_sdhci *sdhci = dev_get_platdata(&pdev->dev);
	47	unsigned long gpio_irq_type;
	48	int val;
	49
	50	val = gpio_get_value(sdhci->data->card_int_gpio);
	51
	52	/* val == 1 -> card removed, val == 0 -> card inserted */
	53	/* if card removed - set irq for low level, else vice versa */
	54	gpio_irq_type = val ? IRQF_TRIGGER_LOW : IRQF_TRIGGER_HIGH;
dced35ae	55	irq_set_irq_type(irq, gpio_irq_type);
c63b3cba VK	56
	57	if (sdhci->data->card_power_gpio >= 0) {
	58	if (!sdhci->data->power_always_enb) {
	59	/* if card inserted, give power, otherwise remove it */
	60	val = sdhci->data->power_active_high ? !val : val ;
	61	gpio_set_value(sdhci->data->card_power_gpio, val);
	62	}
	63	}
	64
	65	/* inform sdhci driver about card insertion/removal */
	66	tasklet_schedule(&host->card_tasklet);
	67
	68	return IRQ_HANDLED;
	69	}
	70
	71	static int __devinit sdhci_probe(struct platform_device *pdev)
	72	{
	73	struct sdhci_host *host;
	74	struct resource *iomem;
	75	struct spear_sdhci *sdhci;
	76	int ret;
	77
c63b3cba VK	78	iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	79	if (!iomem) {
	80	ret = -ENOMEM;
	81	dev_dbg(&pdev->dev, "memory resource not defined\n");
	82	goto err;
	83	}
	84
6ebaf8f2 VK	85	if (!devm_request_mem_region(&pdev->dev, iomem->start,
6ebaf8f2 VK	86	resource_size(iomem), "spear-sdhci")) {
c63b3cba VK	87	ret = -EBUSY;
	88	dev_dbg(&pdev->dev, "cannot request region\n");
	89	goto err;
	90	}
	91
6ebaf8f2	92	sdhci = devm_kzalloc(&pdev->dev, sizeof(*sdhci), GFP_KERNEL);
c63b3cba VK	93	if (!sdhci) {
	94	ret = -ENOMEM;
	95	dev_dbg(&pdev->dev, "cannot allocate memory for sdhci\n");
6ebaf8f2	96	goto err;
c63b3cba VK	97	}
	98
	99	/* clk enable */
	100	sdhci->clk = clk_get(&pdev->dev, NULL);
	101	if (IS_ERR(sdhci->clk)) {
	102	ret = PTR_ERR(sdhci->clk);
	103	dev_dbg(&pdev->dev, "Error getting clock\n");
6ebaf8f2	104	goto err;
c63b3cba VK	105	}
	106
	107	ret = clk_enable(sdhci->clk);
	108	if (ret) {
	109	dev_dbg(&pdev->dev, "Error enabling clock\n");
6ebaf8f2	110	goto put_clk;
c63b3cba VK	111	}
	112
	113	/* overwrite platform_data */
	114	sdhci->data = dev_get_platdata(&pdev->dev);
	115	pdev->dev.platform_data = sdhci;
	116
	117	if (pdev->dev.parent)
	118	host = sdhci_alloc_host(pdev->dev.parent, 0);
	119	else
	120	host = sdhci_alloc_host(&pdev->dev, 0);
	121
	122	if (IS_ERR(host)) {
	123	ret = PTR_ERR(host);
	124	dev_dbg(&pdev->dev, "error allocating host\n");
6ebaf8f2	125	goto disable_clk;
c63b3cba VK	126	}
	127
	128	host->hw_name = "sdhci";
	129	host->ops = &sdhci_pltfm_ops;
	130	host->irq = platform_get_irq(pdev, 0);
	131	host->quirks = SDHCI_QUIRK_BROKEN_ADMA;
	132
6ebaf8f2 VK	133	host->ioaddr = devm_ioremap(&pdev->dev, iomem->start,
6ebaf8f2 VK	134	resource_size(iomem));
c63b3cba VK	135	if (!host->ioaddr) {
	136	ret = -ENOMEM;
	137	dev_dbg(&pdev->dev, "failed to remap registers\n");
6ebaf8f2	138	goto free_host;
c63b3cba VK	139	}
	140
	141	ret = sdhci_add_host(host);
	142	if (ret) {
	143	dev_dbg(&pdev->dev, "error adding host\n");
6ebaf8f2	144	goto free_host;
c63b3cba VK	145	}
	146
	147	platform_set_drvdata(pdev, host);
	148
	149	/*
	150	* It is optional to use GPIOs for sdhci Power control & sdhci card
	151	* interrupt detection. If sdhci->data is NULL, then use original sdhci
	152	* lines otherwise GPIO lines.
	153	* If GPIO is selected for power control, then power should be disabled
	154	* after card removal and should be enabled when card insertion
	155	* interrupt occurs
	156	*/
	157	if (!sdhci->data)
	158	return 0;
	159
	160	if (sdhci->data->card_power_gpio >= 0) {
	161	int val = 0;
	162
6ebaf8f2 VK	163	ret = devm_gpio_request(&pdev->dev,
6ebaf8f2 VK	164	sdhci->data->card_power_gpio, "sdhci");
c63b3cba VK	165	if (ret < 0) {
	166	dev_dbg(&pdev->dev, "gpio request fail: %d\n",
	167	sdhci->data->card_power_gpio);
6ebaf8f2	168	goto set_drvdata;
c63b3cba VK	169	}
	170
	171	if (sdhci->data->power_always_enb)
	172	val = sdhci->data->power_active_high;
	173	else
	174	val = !sdhci->data->power_active_high;
	175
	176	ret = gpio_direction_output(sdhci->data->card_power_gpio, val);
	177	if (ret) {
	178	dev_dbg(&pdev->dev, "gpio set direction fail: %d\n",
	179	sdhci->data->card_power_gpio);
6ebaf8f2	180	goto set_drvdata;
c63b3cba	181	}
c63b3cba VK	182	}
	183
	184	if (sdhci->data->card_int_gpio >= 0) {
6ebaf8f2 VK	185	ret = devm_gpio_request(&pdev->dev, sdhci->data->card_int_gpio,
6ebaf8f2 VK	186	"sdhci");
c63b3cba VK	187	if (ret < 0) {
	188	dev_dbg(&pdev->dev, "gpio request fail: %d\n",
	189	sdhci->data->card_int_gpio);
6ebaf8f2	190	goto set_drvdata;
c63b3cba VK	191	}
	192
	193	ret = gpio_direction_input(sdhci->data->card_int_gpio);
	194	if (ret) {
	195	dev_dbg(&pdev->dev, "gpio set direction fail: %d\n",
	196	sdhci->data->card_int_gpio);
6ebaf8f2	197	goto set_drvdata;
c63b3cba	198	}
6ebaf8f2 VK	199	ret = devm_request_irq(&pdev->dev,
6ebaf8f2 VK	200	gpio_to_irq(sdhci->data->card_int_gpio),
c63b3cba VK	201	sdhci_gpio_irq, IRQF_TRIGGER_LOW,
	202	mmc_hostname(host->mmc), pdev);
	203	if (ret) {
	204	dev_dbg(&pdev->dev, "gpio request irq fail: %d\n",
	205	sdhci->data->card_int_gpio);
6ebaf8f2	206	goto set_drvdata;
c63b3cba VK	207	}
	208
	209	}
	210
	211	return 0;
	212
6ebaf8f2	213	set_drvdata:
c63b3cba VK	214	platform_set_drvdata(pdev, NULL);
c63b3cba VK	215	sdhci_remove_host(host, 1);
6ebaf8f2	216	free_host:
c63b3cba	217	sdhci_free_host(host);
6ebaf8f2	218	disable_clk:
c63b3cba	219	clk_disable(sdhci->clk);
6ebaf8f2	220	put_clk:
c63b3cba	221	clk_put(sdhci->clk);
c63b3cba VK	222	err:
	223	dev_err(&pdev->dev, "spear-sdhci probe failed: %d\n", ret);
	224	return ret;
	225	}
	226
	227	static int __devexit sdhci_remove(struct platform_device *pdev)
	228	{
	229	struct sdhci_host *host = platform_get_drvdata(pdev);
c63b3cba	230	struct spear_sdhci *sdhci = dev_get_platdata(&pdev->dev);
6ebaf8f2	231	int dead = 0;
c63b3cba VK	232	u32 scratch;
c63b3cba VK	233
c63b3cba	234	platform_set_drvdata(pdev, NULL);
c63b3cba VK	235	scratch = readl(host->ioaddr + SDHCI_INT_STATUS);
	236	if (scratch == (u32)-1)
	237	dead = 1;
	238
	239	sdhci_remove_host(host, dead);
c63b3cba VK	240	sdhci_free_host(host);
	241	clk_disable(sdhci->clk);
	242	clk_put(sdhci->clk);
c63b3cba VK	243
	244	return 0;
	245	}
	246
b70a7fab VK	247	#ifdef CONFIG_PM
	248	static int sdhci_suspend(struct device *dev)
	249	{
	250	struct sdhci_host *host = dev_get_drvdata(dev);
	251	struct spear_sdhci *sdhci = dev_get_platdata(dev);
b70a7fab VK	252	int ret;
b70a7fab VK	253
984589e5	254	ret = sdhci_suspend_host(host);
b70a7fab VK	255	if (!ret)
	256	clk_disable(sdhci->clk);
	257
	258	return ret;
	259	}
	260
	261	static int sdhci_resume(struct device *dev)
	262	{
	263	struct sdhci_host *host = dev_get_drvdata(dev);
	264	struct spear_sdhci *sdhci = dev_get_platdata(dev);
	265	int ret;
	266
	267	ret = clk_enable(sdhci->clk);
	268	if (ret) {
	269	dev_dbg(dev, "Resume: Error enabling clock\n");
	270	return ret;
	271	}
	272
	273	return sdhci_resume_host(host);
	274	}
b70a7fab VK	275	#endif
b70a7fab VK	276
4b1a6170 SH	277	static SIMPLE_DEV_PM_OPS(sdhci_pm_ops, sdhci_suspend, sdhci_resume);
4b1a6170 SH	278
c63b3cba VK	279	static struct platform_driver sdhci_driver = {
	280	.driver = {
	281	.name = "sdhci",
	282	.owner = THIS_MODULE,
b70a7fab	283	.pm = &sdhci_pm_ops,
c63b3cba VK	284	},
	285	.probe = sdhci_probe,
	286	.remove = __devexit_p(sdhci_remove),
	287	};
	288
d1f81a64	289	module_platform_driver(sdhci_driver);
c63b3cba VK	290
c63b3cba VK	291	MODULE_DESCRIPTION("SPEAr Secure Digital Host Controller Interface driver");
10d8935f	292	MODULE_AUTHOR("Viresh Kumar <viresh.linux@gmail.com>");
c63b3cba	293	MODULE_LICENSE("GPL v2");