[deliverable/linux.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.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/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;

	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;
		}
	}

	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;
}

#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);
	pm_message_t state = {.event = 0};
	int ret;

	ret = sdhci_suspend_host(host, state);
	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);
}

const struct dev_pm_ops sdhci_pm_ops = {
	.suspend	= sdhci_suspend,
	.resume		= sdhci_resume,
};
#endif

static struct platform_driver sdhci_driver = {
	.driver = {
		.name	= "sdhci",
		.owner	= THIS_MODULE,
#ifdef CONFIG_PM
		.pm	= &sdhci_pm_ops,
#endif
	},
	.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.kumar@st.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
	7	* Viresh Kumar<viresh.kumar@st.com>
	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
	78	BUG_ON(pdev == NULL);
	79
	80	iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	81	if (!iomem) {
	82	ret = -ENOMEM;
	83	dev_dbg(&pdev->dev, "memory resource not defined\n");
	84	goto err;
	85	}
	86
	87	if (!request_mem_region(iomem->start, resource_size(iomem),
	88	"spear-sdhci")) {
	89	ret = -EBUSY;
	90	dev_dbg(&pdev->dev, "cannot request region\n");
	91	goto err;
	92	}
	93
	94	sdhci = kzalloc(sizeof(*sdhci), GFP_KERNEL);
	95	if (!sdhci) {
	96	ret = -ENOMEM;
	97	dev_dbg(&pdev->dev, "cannot allocate memory for sdhci\n");
	98	goto err_kzalloc;
	99	}
	100
	101	/* clk enable */
	102	sdhci->clk = clk_get(&pdev->dev, NULL);
	103	if (IS_ERR(sdhci->clk)) {
	104	ret = PTR_ERR(sdhci->clk);
	105	dev_dbg(&pdev->dev, "Error getting clock\n");
	106	goto err_clk_get;
	107	}
	108
	109	ret = clk_enable(sdhci->clk);
	110	if (ret) {
	111	dev_dbg(&pdev->dev, "Error enabling clock\n");
	112	goto err_clk_enb;
	113	}
	114
	115	/* overwrite platform_data */
	116	sdhci->data = dev_get_platdata(&pdev->dev);
	117	pdev->dev.platform_data = sdhci;
	118
	119	if (pdev->dev.parent)
120	host = sdhci_alloc_host(pdev->dev.parent, 0);
121	else
122	host = sdhci_alloc_host(&pdev->dev, 0);
123
124	if (IS_ERR(host)) {
125	ret = PTR_ERR(host);
126	dev_dbg(&pdev->dev, "error allocating host\n");
127	goto err_alloc_host;
128	}
129
130	host->hw_name = "sdhci";
131	host->ops = &sdhci_pltfm_ops;
132	host->irq = platform_get_irq(pdev, 0);
133	host->quirks = SDHCI_QUIRK_BROKEN_ADMA;
134
135	host->ioaddr = ioremap(iomem->start, resource_size(iomem));
136	if (!host->ioaddr) {
137	ret = -ENOMEM;
138	dev_dbg(&pdev->dev, "failed to remap registers\n");
139	goto err_ioremap;
140	}
141
142	ret = sdhci_add_host(host);
143	if (ret) {
144	dev_dbg(&pdev->dev, "error adding host\n");
145	goto err_add_host;
146	}
147
148	platform_set_drvdata(pdev, host);
149
150	/*
151	* It is optional to use GPIOs for sdhci Power control & sdhci card
152	* interrupt detection. If sdhci->data is NULL, then use original sdhci
153	* lines otherwise GPIO lines.
154	* If GPIO is selected for power control, then power should be disabled
155	* after card removal and should be enabled when card insertion
156	* interrupt occurs
157	*/
158	if (!sdhci->data)
159	return 0;
160
161	if (sdhci->data->card_power_gpio >= 0) {
162	int val = 0;
163
164	ret = gpio_request(sdhci->data->card_power_gpio, "sdhci");
165	if (ret < 0) {
166	dev_dbg(&pdev->dev, "gpio request fail: %d\n",
167	sdhci->data->card_power_gpio);
168	goto err_pgpio_request;
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);
180	goto err_pgpio_direction;
181	}
c63b3cba VK	182	}
	183
	184	if (sdhci->data->card_int_gpio >= 0) {
	185	ret = gpio_request(sdhci->data->card_int_gpio, "sdhci");
	186	if (ret < 0) {
	187	dev_dbg(&pdev->dev, "gpio request fail: %d\n",
	188	sdhci->data->card_int_gpio);
	189	goto err_igpio_request;
	190	}
	191
	192	ret = gpio_direction_input(sdhci->data->card_int_gpio);
	193	if (ret) {
	194	dev_dbg(&pdev->dev, "gpio set direction fail: %d\n",
	195	sdhci->data->card_int_gpio);
	196	goto err_igpio_direction;
	197	}
	198	ret = request_irq(gpio_to_irq(sdhci->data->card_int_gpio),
	199	sdhci_gpio_irq, IRQF_TRIGGER_LOW,
	200	mmc_hostname(host->mmc), pdev);
	201	if (ret) {
	202	dev_dbg(&pdev->dev, "gpio request irq fail: %d\n",
	203	sdhci->data->card_int_gpio);
	204	goto err_igpio_request_irq;
	205	}
	206
	207	}
	208
	209	return 0;
	210
	211	err_igpio_request_irq:
	212	err_igpio_direction:
	213	if (sdhci->data->card_int_gpio >= 0)
	214	gpio_free(sdhci->data->card_int_gpio);
	215	err_igpio_request:
	216	err_pgpio_direction:
	217	if (sdhci->data->card_power_gpio >= 0)
	218	gpio_free(sdhci->data->card_power_gpio);
	219	err_pgpio_request:
	220	platform_set_drvdata(pdev, NULL);
	221	sdhci_remove_host(host, 1);
	222	err_add_host:
	223	iounmap(host->ioaddr);
	224	err_ioremap:
	225	sdhci_free_host(host);
	226	err_alloc_host:
	227	clk_disable(sdhci->clk);
	228	err_clk_enb:
	229	clk_put(sdhci->clk);
	230	err_clk_get:
	231	kfree(sdhci);
	232	err_kzalloc:
	233	release_mem_region(iomem->start, resource_size(iomem));
	234	err:
	235	dev_err(&pdev->dev, "spear-sdhci probe failed: %d\n", ret);
	236	return ret;
	237	}
	238
	239	static int __devexit sdhci_remove(struct platform_device *pdev)
	240	{
	241	struct sdhci_host *host = platform_get_drvdata(pdev);
	242	struct resource *iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	243	struct spear_sdhci *sdhci = dev_get_platdata(&pdev->dev);
	244	int dead;
	245	u32 scratch;
246
247	if (sdhci->data) {
248	if (sdhci->data->card_int_gpio >= 0) {
249	free_irq(gpio_to_irq(sdhci->data->card_int_gpio), pdev);
250	gpio_free(sdhci->data->card_int_gpio);
251	}
252
253	if (sdhci->data->card_power_gpio >= 0)
254	gpio_free(sdhci->data->card_power_gpio);
255	}
256
257	platform_set_drvdata(pdev, NULL);
258	dead = 0;
259	scratch = readl(host->ioaddr + SDHCI_INT_STATUS);
260	if (scratch == (u32)-1)
261	dead = 1;
262
263	sdhci_remove_host(host, dead);
264	iounmap(host->ioaddr);
265	sdhci_free_host(host);
266	clk_disable(sdhci->clk);
267	clk_put(sdhci->clk);
268	kfree(sdhci);
269	if (iomem)
270	release_mem_region(iomem->start, resource_size(iomem));
271
272	return 0;
273	}
274
b70a7fab VK	275	#ifdef CONFIG_PM
	276	static int sdhci_suspend(struct device *dev)
	277	{
	278	struct sdhci_host *host = dev_get_drvdata(dev);
	279	struct spear_sdhci *sdhci = dev_get_platdata(dev);
	280	pm_message_t state = {.event = 0};
	281	int ret;
	282
	283	ret = sdhci_suspend_host(host, state);
	284	if (!ret)
	285	clk_disable(sdhci->clk);
	286
	287	return ret;
	288	}
	289
	290	static int sdhci_resume(struct device *dev)
	291	{
	292	struct sdhci_host *host = dev_get_drvdata(dev);
	293	struct spear_sdhci *sdhci = dev_get_platdata(dev);
	294	int ret;
	295
	296	ret = clk_enable(sdhci->clk);
	297	if (ret) {
	298	dev_dbg(dev, "Resume: Error enabling clock\n");
	299	return ret;
	300	}
	301
	302	return sdhci_resume_host(host);
	303	}
	304
	305	const struct dev_pm_ops sdhci_pm_ops = {
	306	.suspend = sdhci_suspend,
	307	.resume = sdhci_resume,
	308	};
	309	#endif
	310
c63b3cba VK	311	static struct platform_driver sdhci_driver = {
	312	.driver = {
	313	.name = "sdhci",
	314	.owner = THIS_MODULE,
b70a7fab VK	315	#ifdef CONFIG_PM
	316	.pm = &sdhci_pm_ops,
	317	#endif
c63b3cba VK	318	},
	319	.probe = sdhci_probe,
	320	.remove = __devexit_p(sdhci_remove),
	321	};
	322
d1f81a64	323	module_platform_driver(sdhci_driver);
c63b3cba VK	324
	325	MODULE_DESCRIPTION("SPEAr Secure Digital Host Controller Interface driver");
	326	MODULE_AUTHOR("Viresh Kumar <viresh.kumar@st.com>");
	327	MODULE_LICENSE("GPL v2");