[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 <vireshk@kernel.org>
 *
 * 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/slot-gpio.h>
#include <linux/io.h>
#include "sdhci.h"

struct spear_sdhci {
	struct clk *clk;
	int card_int_gpio;
};

/* sdhci ops */
static const struct sdhci_ops sdhci_pltfm_ops = {
	.set_clock = sdhci_set_clock,
	.set_bus_width = sdhci_set_bus_width,
	.reset = sdhci_reset,
	.set_uhs_signaling = sdhci_set_uhs_signaling,
};

static void sdhci_probe_config_dt(struct device_node *np,
				struct spear_sdhci *host)
{
	int cd_gpio;

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

	host->card_int_gpio = cd_gpio;
}

static int sdhci_probe(struct platform_device *pdev)
{
	struct sdhci_host *host;
	struct resource *iomem;
	struct spear_sdhci *sdhci;
	struct device *dev;
	int ret;

	dev = pdev->dev.parent ? pdev->dev.parent : &pdev->dev;
	host = sdhci_alloc_host(dev, sizeof(*sdhci));
	if (IS_ERR(host)) {
		ret = PTR_ERR(host);
		dev_dbg(&pdev->dev, "cannot allocate memory for sdhci\n");
		goto err;
	}

	iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	host->ioaddr = devm_ioremap_resource(&pdev->dev, iomem);
	if (IS_ERR(host->ioaddr)) {
		ret = PTR_ERR(host->ioaddr);
		dev_dbg(&pdev->dev, "unable to map iomem: %d\n", ret);
		goto err_host;
	}

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

	sdhci = sdhci_priv(host);

	/* clk enable */
	sdhci->clk = devm_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_host;
	}

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

	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));

	sdhci_probe_config_dt(pdev->dev.of_node, sdhci);
	/*
	 * It is optional to use GPIOs for sdhci card detection. If
	 * sdhci->card_int_gpio < 0, then use original sdhci lines otherwise
	 * GPIO lines. We use the built-in GPIO support for this.
	 */
	if (sdhci->card_int_gpio >= 0) {
		ret = mmc_gpio_request_cd(host->mmc, sdhci->card_int_gpio, 0);
		if (ret < 0) {
			dev_dbg(&pdev->dev,
				"failed to request card-detect gpio%d\n",
				sdhci->card_int_gpio);
			goto disable_clk;
		}
	}

	ret = sdhci_add_host(host);
	if (ret) {
		dev_dbg(&pdev->dev, "error adding host\n");
		goto disable_clk;
	}

	platform_set_drvdata(pdev, host);

	return 0;

disable_clk:
	clk_disable_unprepare(sdhci->clk);
err_host:
	sdhci_free_host(host);
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 = sdhci_priv(host);
	int dead = 0;
	u32 scratch;

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

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

	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 = sdhci_priv(host);
	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 = sdhci_priv(host);
	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",
		.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 <vireshk@kernel.org>");
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
da89947b	7	* Viresh Kumar <vireshk@kernel.org>
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>
c63b3cba VK	22	#include <linux/irq.h>
067bf748 VK	23	#include <linux/of.h>
067bf748 VK	24	#include <linux/of_gpio.h>
c63b3cba	25	#include <linux/platform_device.h>
b70a7fab	26	#include <linux/pm.h>
c63b3cba VK	27	#include <linux/slab.h>
c63b3cba VK	28	#include <linux/mmc/host.h>
b42b9b12	29	#include <linux/mmc/slot-gpio.h>
c63b3cba VK	30	#include <linux/io.h>
	31	#include "sdhci.h"
	32
	33	struct spear_sdhci {
	34	struct clk *clk;
03a6d291	35	int card_int_gpio;
c63b3cba VK	36	};
	37
	38	/* sdhci ops */
c915568d	39	static const struct sdhci_ops sdhci_pltfm_ops = {
1771059c	40	.set_clock = sdhci_set_clock,
2317f56c	41	.set_bus_width = sdhci_set_bus_width,
03231f9b	42	.reset = sdhci_reset,
96d7b78c	43	.set_uhs_signaling = sdhci_set_uhs_signaling,
c63b3cba VK	44	};
c63b3cba VK	45
03a6d291 UH	46	static void sdhci_probe_config_dt(struct device_node *np,
03a6d291 UH	47	struct spear_sdhci *host)
067bf748	48	{
067bf748 VK	49	int cd_gpio;
	50
	51	cd_gpio = of_get_named_gpio(np, "cd-gpios", 0);
	52	if (!gpio_is_valid(cd_gpio))
	53	cd_gpio = -1;
	54
03a6d291	55	host->card_int_gpio = cd_gpio;
067bf748	56	}
067bf748	57
c3be1efd	58	static int sdhci_probe(struct platform_device *pdev)
c63b3cba VK	59	{
	60	struct sdhci_host *host;
	61	struct resource *iomem;
	62	struct spear_sdhci *sdhci;
fcdb7c8f	63	struct device *dev;
c63b3cba VK	64	int ret;
c63b3cba VK	65
fcdb7c8f RK	66	dev = pdev->dev.parent ? pdev->dev.parent : &pdev->dev;
	67	host = sdhci_alloc_host(dev, sizeof(*sdhci));
	68	if (IS_ERR(host)) {
	69	ret = PTR_ERR(host);
c63b3cba	70	dev_dbg(&pdev->dev, "cannot allocate memory for sdhci\n");
6ebaf8f2	71	goto err;
c63b3cba VK	72	}
c63b3cba VK	73
475d9e3e RK	74	iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	75	host->ioaddr = devm_ioremap_resource(&pdev->dev, iomem);
	76	if (IS_ERR(host->ioaddr)) {
	77	ret = PTR_ERR(host->ioaddr);
	78	dev_dbg(&pdev->dev, "unable to map iomem: %d\n", ret);
	79	goto err_host;
	80	}
	81
	82	host->hw_name = "sdhci";
	83	host->ops = &sdhci_pltfm_ops;
	84	host->irq = platform_get_irq(pdev, 0);
	85	host->quirks = SDHCI_QUIRK_BROKEN_ADMA;
	86
fcdb7c8f RK	87	sdhci = sdhci_priv(host);
fcdb7c8f RK	88
c63b3cba	89	/* clk enable */
142dbab9	90	sdhci->clk = devm_clk_get(&pdev->dev, NULL);
c63b3cba VK	91	if (IS_ERR(sdhci->clk)) {
	92	ret = PTR_ERR(sdhci->clk);
	93	dev_dbg(&pdev->dev, "Error getting clock\n");
fcdb7c8f	94	goto err_host;
c63b3cba VK	95	}
c63b3cba VK	96
da764f97	97	ret = clk_prepare_enable(sdhci->clk);
c63b3cba VK	98	if (ret) {
c63b3cba VK	99	dev_dbg(&pdev->dev, "Error enabling clock\n");
fcdb7c8f	100	goto err_host;
c63b3cba VK	101	}
c63b3cba VK	102
257f9df1 VKS	103	ret = clk_set_rate(sdhci->clk, 50000000);
	104	if (ret)
	105	dev_dbg(&pdev->dev, "Error setting desired clk, clk=%lu\n",
	106	clk_get_rate(sdhci->clk));
	107
03a6d291	108	sdhci_probe_config_dt(pdev->dev.of_node, sdhci);
b42b9b12 RK	109	/*
b42b9b12 RK	110	* It is optional to use GPIOs for sdhci card detection. If
03a6d291	111	* sdhci->card_int_gpio < 0, then use original sdhci lines otherwise
b42b9b12 RK	112	* GPIO lines. We use the built-in GPIO support for this.
b42b9b12 RK	113	*/
03a6d291 UH	114	if (sdhci->card_int_gpio >= 0) {
03a6d291 UH	115	ret = mmc_gpio_request_cd(host->mmc, sdhci->card_int_gpio, 0);
b42b9b12 RK	116	if (ret < 0) {
	117	dev_dbg(&pdev->dev,
	118	"failed to request card-detect gpio%d\n",
03a6d291	119	sdhci->card_int_gpio);
b42b9b12 RK	120	goto disable_clk;
	121	}
	122	}
	123
c63b3cba VK	124	ret = sdhci_add_host(host);
	125	if (ret) {
	126	dev_dbg(&pdev->dev, "error adding host\n");
fcdb7c8f	127	goto disable_clk;
c63b3cba VK	128	}
	129
	130	platform_set_drvdata(pdev, host);
	131
c63b3cba VK	132	return 0;
c63b3cba VK	133
6ebaf8f2	134	disable_clk:
da764f97	135	clk_disable_unprepare(sdhci->clk);
fcdb7c8f RK	136	err_host:
fcdb7c8f RK	137	sdhci_free_host(host);
c63b3cba VK	138	err:
	139	dev_err(&pdev->dev, "spear-sdhci probe failed: %d\n", ret);
	140	return ret;
	141	}
	142
6e0ee714	143	static int sdhci_remove(struct platform_device *pdev)
c63b3cba VK	144	{
c63b3cba VK	145	struct sdhci_host *host = platform_get_drvdata(pdev);
fcdb7c8f	146	struct spear_sdhci *sdhci = sdhci_priv(host);
6ebaf8f2	147	int dead = 0;
c63b3cba VK	148	u32 scratch;
c63b3cba VK	149
c63b3cba VK	150	scratch = readl(host->ioaddr + SDHCI_INT_STATUS);
	151	if (scratch == (u32)-1)
	152	dead = 1;
	153
	154	sdhci_remove_host(host, dead);
da764f97	155	clk_disable_unprepare(sdhci->clk);
fcdb7c8f	156	sdhci_free_host(host);
c63b3cba VK	157
	158	return 0;
	159	}
	160
b0dd099c	161	#ifdef CONFIG_PM_SLEEP
b70a7fab VK	162	static int sdhci_suspend(struct device *dev)
	163	{
	164	struct sdhci_host *host = dev_get_drvdata(dev);
fcdb7c8f	165	struct spear_sdhci *sdhci = sdhci_priv(host);
b70a7fab VK	166	int ret;
b70a7fab VK	167
984589e5	168	ret = sdhci_suspend_host(host);
b70a7fab	169	if (!ret)
06960a1b	170	clk_disable(sdhci->clk);
b70a7fab VK	171
	172	return ret;
	173	}
	174
	175	static int sdhci_resume(struct device *dev)
	176	{
	177	struct sdhci_host *host = dev_get_drvdata(dev);
fcdb7c8f	178	struct spear_sdhci *sdhci = sdhci_priv(host);
b70a7fab VK	179	int ret;
b70a7fab VK	180
06960a1b	181	ret = clk_enable(sdhci->clk);
b70a7fab VK	182	if (ret) {
	183	dev_dbg(dev, "Resume: Error enabling clock\n");
	184	return ret;
	185	}
	186
	187	return sdhci_resume_host(host);
	188	}
b70a7fab VK	189	#endif
b70a7fab VK	190
4b1a6170 SH	191	static SIMPLE_DEV_PM_OPS(sdhci_pm_ops, sdhci_suspend, sdhci_resume);
4b1a6170 SH	192
067bf748 VK	193	#ifdef CONFIG_OF
	194	static const struct of_device_id sdhci_spear_id_table[] = {
	195	{ .compatible = "st,spear300-sdhci" },
	196	{}
	197	};
	198	MODULE_DEVICE_TABLE(of, sdhci_spear_id_table);
	199	#endif
	200
c63b3cba VK	201	static struct platform_driver sdhci_driver = {
	202	.driver = {
	203	.name = "sdhci",
b70a7fab	204	.pm = &sdhci_pm_ops,
067bf748	205	.of_match_table = of_match_ptr(sdhci_spear_id_table),
c63b3cba VK	206	},
c63b3cba VK	207	.probe = sdhci_probe,
0433c143	208	.remove = sdhci_remove,
c63b3cba VK	209	};
c63b3cba VK	210
d1f81a64	211	module_platform_driver(sdhci_driver);
c63b3cba VK	212
c63b3cba VK	213	MODULE_DESCRIPTION("SPEAr Secure Digital Host Controller Interface driver");
da89947b	214	MODULE_AUTHOR("Viresh Kumar <vireshk@kernel.org>");
c63b3cba	215	MODULE_LICENSE("GPL v2");