[linux-2.6-block.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/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;
}

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");
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>
	24	#include <linux/slab.h>
	25	#include <linux/mmc/host.h>
	26	#include <linux/mmc/sdhci-spear.h>
	27	#include <linux/io.h>
	28	#include "sdhci.h"
	29
	30	struct spear_sdhci {
	31	struct clk *clk;
	32	struct sdhci_plat_data *data;
	33	};
	34
	35	/* sdhci ops */
	36	static struct sdhci_ops sdhci_pltfm_ops = {
	37	/* Nothing to do for now. */
	38	};
	39
	40	/* gpio card detection interrupt handler */
	41	static irqreturn_t sdhci_gpio_irq(int irq, void *dev_id)
	42	{
	43	struct platform_device *pdev = dev_id;
	44	struct sdhci_host *host = platform_get_drvdata(pdev);
	45	struct spear_sdhci *sdhci = dev_get_platdata(&pdev->dev);
	46	unsigned long gpio_irq_type;
	47	int val;
	48
	49	val = gpio_get_value(sdhci->data->card_int_gpio);
	50
	51	/* val == 1 -> card removed, val == 0 -> card inserted */
	52	/* if card removed - set irq for low level, else vice versa */
	53	gpio_irq_type = val ? IRQF_TRIGGER_LOW : IRQF_TRIGGER_HIGH;
dced35ae	54	irq_set_irq_type(irq, gpio_irq_type);
c63b3cba VK	55
	56	if (sdhci->data->card_power_gpio >= 0) {
	57	if (!sdhci->data->power_always_enb) {
	58	/* if card inserted, give power, otherwise remove it */
	59	val = sdhci->data->power_active_high ? !val : val ;
	60	gpio_set_value(sdhci->data->card_power_gpio, val);
	61	}
	62	}
	63
	64	/* inform sdhci driver about card insertion/removal */
	65	tasklet_schedule(&host->card_tasklet);
	66
	67	return IRQ_HANDLED;
	68	}
	69
	70	static int __devinit sdhci_probe(struct platform_device *pdev)
	71	{
	72	struct sdhci_host *host;
	73	struct resource *iomem;
	74	struct spear_sdhci *sdhci;
	75	int ret;
	76
	77	BUG_ON(pdev == NULL);
	78
	79	iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	80	if (!iomem) {
	81	ret = -ENOMEM;
	82	dev_dbg(&pdev->dev, "memory resource not defined\n");
	83	goto err;
	84	}
	85
	86	if (!request_mem_region(iomem->start, resource_size(iomem),
	87	"spear-sdhci")) {
	88	ret = -EBUSY;
	89	dev_dbg(&pdev->dev, "cannot request region\n");
	90	goto err;
	91	}
	92
	93	sdhci = kzalloc(sizeof(*sdhci), GFP_KERNEL);
	94	if (!sdhci) {
	95	ret = -ENOMEM;
	96	dev_dbg(&pdev->dev, "cannot allocate memory for sdhci\n");
	97	goto err_kzalloc;
	98	}
	99
	100	/* clk enable */
	101	sdhci->clk = clk_get(&pdev->dev, NULL);
	102	if (IS_ERR(sdhci->clk)) {
	103	ret = PTR_ERR(sdhci->clk);
	104	dev_dbg(&pdev->dev, "Error getting clock\n");
	105	goto err_clk_get;
	106	}
	107
	108	ret = clk_enable(sdhci->clk);
	109	if (ret) {
	110	dev_dbg(&pdev->dev, "Error enabling clock\n");
	111	goto err_clk_enb;
	112	}
	113
	114	/* overwrite platform_data */
	115	sdhci->data = dev_get_platdata(&pdev->dev);
	116	pdev->dev.platform_data = sdhci;
	117
	118	if (pdev->dev.parent)
119	host = sdhci_alloc_host(pdev->dev.parent, 0);
120	else
121	host = sdhci_alloc_host(&pdev->dev, 0);
122
123	if (IS_ERR(host)) {
124	ret = PTR_ERR(host);
125	dev_dbg(&pdev->dev, "error allocating host\n");
126	goto err_alloc_host;
127	}
128
129	host->hw_name = "sdhci";
130	host->ops = &sdhci_pltfm_ops;
131	host->irq = platform_get_irq(pdev, 0);
132	host->quirks = SDHCI_QUIRK_BROKEN_ADMA;
133
134	host->ioaddr = ioremap(iomem->start, resource_size(iomem));
135	if (!host->ioaddr) {
136	ret = -ENOMEM;
137	dev_dbg(&pdev->dev, "failed to remap registers\n");
138	goto err_ioremap;
139	}
140
141	ret = sdhci_add_host(host);
142	if (ret) {
143	dev_dbg(&pdev->dev, "error adding host\n");
144	goto err_add_host;
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
163	ret = gpio_request(sdhci->data->card_power_gpio, "sdhci");
164	if (ret < 0) {
165	dev_dbg(&pdev->dev, "gpio request fail: %d\n",
166	sdhci->data->card_power_gpio);
167	goto err_pgpio_request;
168	}
169
170	if (sdhci->data->power_always_enb)
171	val = sdhci->data->power_active_high;
172	else
173	val = !sdhci->data->power_active_high;
174
175	ret = gpio_direction_output(sdhci->data->card_power_gpio, val);
176	if (ret) {
177	dev_dbg(&pdev->dev, "gpio set direction fail: %d\n",
178	sdhci->data->card_power_gpio);
179	goto err_pgpio_direction;
180	}
c63b3cba VK	181	}
	182
	183	if (sdhci->data->card_int_gpio >= 0) {
	184	ret = gpio_request(sdhci->data->card_int_gpio, "sdhci");
	185	if (ret < 0) {
	186	dev_dbg(&pdev->dev, "gpio request fail: %d\n",
	187	sdhci->data->card_int_gpio);
	188	goto err_igpio_request;
	189	}
	190
	191	ret = gpio_direction_input(sdhci->data->card_int_gpio);
	192	if (ret) {
	193	dev_dbg(&pdev->dev, "gpio set direction fail: %d\n",
	194	sdhci->data->card_int_gpio);
	195	goto err_igpio_direction;
	196	}
	197	ret = request_irq(gpio_to_irq(sdhci->data->card_int_gpio),
	198	sdhci_gpio_irq, IRQF_TRIGGER_LOW,
	199	mmc_hostname(host->mmc), pdev);
	200	if (ret) {
	201	dev_dbg(&pdev->dev, "gpio request irq fail: %d\n",
	202	sdhci->data->card_int_gpio);
	203	goto err_igpio_request_irq;
	204	}
	205
	206	}
	207
	208	return 0;
	209
	210	err_igpio_request_irq:
	211	err_igpio_direction:
	212	if (sdhci->data->card_int_gpio >= 0)
	213	gpio_free(sdhci->data->card_int_gpio);
	214	err_igpio_request:
	215	err_pgpio_direction:
	216	if (sdhci->data->card_power_gpio >= 0)
	217	gpio_free(sdhci->data->card_power_gpio);
	218	err_pgpio_request:
	219	platform_set_drvdata(pdev, NULL);
	220	sdhci_remove_host(host, 1);
	221	err_add_host:
	222	iounmap(host->ioaddr);
	223	err_ioremap:
	224	sdhci_free_host(host);
	225	err_alloc_host:
	226	clk_disable(sdhci->clk);
	227	err_clk_enb:
	228	clk_put(sdhci->clk);
	229	err_clk_get:
	230	kfree(sdhci);
	231	err_kzalloc:
	232	release_mem_region(iomem->start, resource_size(iomem));
	233	err:
	234	dev_err(&pdev->dev, "spear-sdhci probe failed: %d\n", ret);
	235	return ret;
	236	}
	237
	238	static int __devexit sdhci_remove(struct platform_device *pdev)
	239	{
	240	struct sdhci_host *host = platform_get_drvdata(pdev);
	241	struct resource *iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	242	struct spear_sdhci *sdhci = dev_get_platdata(&pdev->dev);
	243	int dead;
	244	u32 scratch;
245
246	if (sdhci->data) {
247	if (sdhci->data->card_int_gpio >= 0) {
248	free_irq(gpio_to_irq(sdhci->data->card_int_gpio), pdev);
249	gpio_free(sdhci->data->card_int_gpio);
250	}
251
252	if (sdhci->data->card_power_gpio >= 0)
253	gpio_free(sdhci->data->card_power_gpio);
254	}
255
256	platform_set_drvdata(pdev, NULL);
257	dead = 0;
258	scratch = readl(host->ioaddr + SDHCI_INT_STATUS);
259	if (scratch == (u32)-1)
260	dead = 1;
261
262	sdhci_remove_host(host, dead);
263	iounmap(host->ioaddr);
264	sdhci_free_host(host);
265	clk_disable(sdhci->clk);
266	clk_put(sdhci->clk);
267	kfree(sdhci);
268	if (iomem)
269	release_mem_region(iomem->start, resource_size(iomem));
270
271	return 0;
272	}
273
274	static struct platform_driver sdhci_driver = {
275	.driver = {
276	.name = "sdhci",
277	.owner = THIS_MODULE,
278	},
279	.probe = sdhci_probe,
280	.remove = __devexit_p(sdhci_remove),
281	};
282
283	static int __init sdhci_init(void)
284	{
285	return platform_driver_register(&sdhci_driver);
286	}
287	module_init(sdhci_init);
288
289	static void __exit sdhci_exit(void)
290	{
291	platform_driver_unregister(&sdhci_driver);
292	}
293	module_exit(sdhci_exit);
294
295	MODULE_DESCRIPTION("SPEAr Secure Digital Host Controller Interface driver");
296	MODULE_AUTHOR("Viresh Kumar <viresh.kumar@st.com>");
297	MODULE_LICENSE("GPL v2");