[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/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");
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>
	20	#include <linux/interrupt.h>
	21	#include <linux/irq.h>
	22	#include <linux/platform_device.h>
	23	#include <linux/slab.h>
	24	#include <linux/mmc/host.h>
	25	#include <linux/mmc/sdhci-spear.h>
	26	#include <linux/io.h>
	27	#include "sdhci.h"
	28
	29	struct spear_sdhci {
	30	struct clk *clk;
	31	struct sdhci_plat_data *data;
	32	};
	33
	34	/* sdhci ops */
	35	static struct sdhci_ops sdhci_pltfm_ops = {
	36	/* Nothing to do for now. */
	37	};
	38
	39	/* gpio card detection interrupt handler */
	40	static irqreturn_t sdhci_gpio_irq(int irq, void *dev_id)
	41	{
	42	struct platform_device *pdev = dev_id;
	43	struct sdhci_host *host = platform_get_drvdata(pdev);
	44	struct spear_sdhci *sdhci = dev_get_platdata(&pdev->dev);
	45	unsigned long gpio_irq_type;
	46	int val;
	47
	48	val = gpio_get_value(sdhci->data->card_int_gpio);
	49
	50	/* val == 1 -> card removed, val == 0 -> card inserted */
	51	/* if card removed - set irq for low level, else vice versa */
	52	gpio_irq_type = val ? IRQF_TRIGGER_LOW : IRQF_TRIGGER_HIGH;
	53	set_irq_type(irq, gpio_irq_type);
	54
	55	if (sdhci->data->card_power_gpio >= 0) {
	56	if (!sdhci->data->power_always_enb) {
	57	/* if card inserted, give power, otherwise remove it */
	58	val = sdhci->data->power_active_high ? !val : val ;
	59	gpio_set_value(sdhci->data->card_power_gpio, val);
	60	}
	61	}
	62
	63	/* inform sdhci driver about card insertion/removal */
	64	tasklet_schedule(&host->card_tasklet);
65
66	return IRQ_HANDLED;
67	}
68
69	static int __devinit sdhci_probe(struct platform_device *pdev)
70	{
71	struct sdhci_host *host;
72	struct resource *iomem;
73	struct spear_sdhci *sdhci;
74	int ret;
75
76	BUG_ON(pdev == NULL);
77
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
85	if (!request_mem_region(iomem->start, resource_size(iomem),
86	"spear-sdhci")) {
87	ret = -EBUSY;
88	dev_dbg(&pdev->dev, "cannot request region\n");
89	goto err;
90	}
91
92	sdhci = kzalloc(sizeof(*sdhci), GFP_KERNEL);
93	if (!sdhci) {
94	ret = -ENOMEM;
95	dev_dbg(&pdev->dev, "cannot allocate memory for sdhci\n");
96	goto err_kzalloc;
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");
104	goto err_clk_get;
105	}
106
107	ret = clk_enable(sdhci->clk);
108	if (ret) {
109	dev_dbg(&pdev->dev, "Error enabling clock\n");
110	goto err_clk_enb;
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");
125	goto err_alloc_host;
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
133	host->ioaddr = ioremap(iomem->start, resource_size(iomem));
134	if (!host->ioaddr) {
135	ret = -ENOMEM;
136	dev_dbg(&pdev->dev, "failed to remap registers\n");
137	goto err_ioremap;
138	}
139
140	ret = sdhci_add_host(host);
141	if (ret) {
142	dev_dbg(&pdev->dev, "error adding host\n");
143	goto err_add_host;
144	}
145
146	platform_set_drvdata(pdev, host);
147
148	/*
149	* It is optional to use GPIOs for sdhci Power control & sdhci card
150	* interrupt detection. If sdhci->data is NULL, then use original sdhci
151	* lines otherwise GPIO lines.
152	* If GPIO is selected for power control, then power should be disabled
153	* after card removal and should be enabled when card insertion
154	* interrupt occurs
155	*/
156	if (!sdhci->data)
157	return 0;
158
159	if (sdhci->data->card_power_gpio >= 0) {
160	int val = 0;
161
162	ret = gpio_request(sdhci->data->card_power_gpio, "sdhci");
163	if (ret < 0) {
164	dev_dbg(&pdev->dev, "gpio request fail: %d\n",
165	sdhci->data->card_power_gpio);
166	goto err_pgpio_request;
167	}
168
169	if (sdhci->data->power_always_enb)
170	val = sdhci->data->power_active_high;
171	else
172	val = !sdhci->data->power_active_high;
173
174	ret = gpio_direction_output(sdhci->data->card_power_gpio, val);
175	if (ret) {
176	dev_dbg(&pdev->dev, "gpio set direction fail: %d\n",
177	sdhci->data->card_power_gpio);
178	goto err_pgpio_direction;
179	}
180
181	gpio_set_value(sdhci->data->card_power_gpio, 1);
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
275	static struct platform_driver sdhci_driver = {
276	.driver = {
277	.name = "sdhci",
278	.owner = THIS_MODULE,
279	},
280	.probe = sdhci_probe,
281	.remove = __devexit_p(sdhci_remove),
282	};
283
284	static int __init sdhci_init(void)
285	{
286	return platform_driver_register(&sdhci_driver);
287	}
288	module_init(sdhci_init);
289
290	static void __exit sdhci_exit(void)
291	{
292	platform_driver_unregister(&sdhci_driver);
293	}
294	module_exit(sdhci_exit);
295
296	MODULE_DESCRIPTION("SPEAr Secure Digital Host Controller Interface driver");
297	MODULE_AUTHOR("Viresh Kumar <viresh.kumar@st.com>");
298	MODULE_LICENSE("GPL v2");