[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 <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/highmem.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/of.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;
};

/* 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 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);
	if (host->irq <= 0) {
		ret = -EINVAL;
		goto err_host;
	}
	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));

	/*
	 * It is optional to use GPIOs for sdhci card detection. If we
	 * find a descriptor using slot GPIO, we use it.
	 */
	ret = mmc_gpiod_request_cd(host->mmc, "cd", 0, false, 0, NULL);
	if (ret == -EPROBE_DEFER)
		goto disable_clk;

	ret = sdhci_add_host(host);
	if (ret)
		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;

	if (host->tuning_mode != SDHCI_TUNING_MODE_3)
		mmc_retune_needed(host->mmc);

	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>
c63b3cba	18	#include <linux/highmem.h>
88b47679	19	#include <linux/module.h>
c63b3cba VK	20	#include <linux/interrupt.h>
c63b3cba VK	21	#include <linux/irq.h>
067bf748	22	#include <linux/of.h>
c63b3cba	23	#include <linux/platform_device.h>
b70a7fab	24	#include <linux/pm.h>
c63b3cba VK	25	#include <linux/slab.h>
c63b3cba VK	26	#include <linux/mmc/host.h>
b42b9b12	27	#include <linux/mmc/slot-gpio.h>
c63b3cba VK	28	#include <linux/io.h>
	29	#include "sdhci.h"
	30
	31	struct spear_sdhci {
	32	struct clk *clk;
c63b3cba VK	33	};
	34
	35	/* sdhci ops */
c915568d	36	static const struct sdhci_ops sdhci_pltfm_ops = {
1771059c	37	.set_clock = sdhci_set_clock,
2317f56c	38	.set_bus_width = sdhci_set_bus_width,
03231f9b	39	.reset = sdhci_reset,
96d7b78c	40	.set_uhs_signaling = sdhci_set_uhs_signaling,
c63b3cba VK	41	};
c63b3cba VK	42
c3be1efd	43	static int sdhci_probe(struct platform_device *pdev)
c63b3cba VK	44	{
	45	struct sdhci_host *host;
	46	struct resource *iomem;
	47	struct spear_sdhci *sdhci;
fcdb7c8f	48	struct device *dev;
c63b3cba VK	49	int ret;
c63b3cba VK	50
fcdb7c8f RK	51	dev = pdev->dev.parent ? pdev->dev.parent : &pdev->dev;
	52	host = sdhci_alloc_host(dev, sizeof(*sdhci));
	53	if (IS_ERR(host)) {
	54	ret = PTR_ERR(host);
c63b3cba	55	dev_dbg(&pdev->dev, "cannot allocate memory for sdhci\n");
6ebaf8f2	56	goto err;
c63b3cba VK	57	}
c63b3cba VK	58
475d9e3e RK	59	iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	60	host->ioaddr = devm_ioremap_resource(&pdev->dev, iomem);
	61	if (IS_ERR(host->ioaddr)) {
	62	ret = PTR_ERR(host->ioaddr);
	63	dev_dbg(&pdev->dev, "unable to map iomem: %d\n", ret);
	64	goto err_host;
	65	}
	66
	67	host->hw_name = "sdhci";
	68	host->ops = &sdhci_pltfm_ops;
	69	host->irq = platform_get_irq(pdev, 0);
682798a5 AY	70	if (host->irq <= 0) {
	71	ret = -EINVAL;
	72	goto err_host;
	73	}
475d9e3e RK	74	host->quirks = SDHCI_QUIRK_BROKEN_ADMA;
475d9e3e RK	75
fcdb7c8f RK	76	sdhci = sdhci_priv(host);
fcdb7c8f RK	77
c63b3cba	78	/* clk enable */
142dbab9	79	sdhci->clk = devm_clk_get(&pdev->dev, NULL);
c63b3cba VK	80	if (IS_ERR(sdhci->clk)) {
	81	ret = PTR_ERR(sdhci->clk);
	82	dev_dbg(&pdev->dev, "Error getting clock\n");
fcdb7c8f	83	goto err_host;
c63b3cba VK	84	}
c63b3cba VK	85
da764f97	86	ret = clk_prepare_enable(sdhci->clk);
c63b3cba VK	87	if (ret) {
c63b3cba VK	88	dev_dbg(&pdev->dev, "Error enabling clock\n");
fcdb7c8f	89	goto err_host;
c63b3cba VK	90	}
c63b3cba VK	91
257f9df1 VKS	92	ret = clk_set_rate(sdhci->clk, 50000000);
	93	if (ret)
	94	dev_dbg(&pdev->dev, "Error setting desired clk, clk=%lu\n",
	95	clk_get_rate(sdhci->clk));
	96
b42b9b12	97	/*
b007c4ce LW	98	* It is optional to use GPIOs for sdhci card detection. If we
b007c4ce LW	99	* find a descriptor using slot GPIO, we use it.
b42b9b12	100	*/
b007c4ce LW	101	ret = mmc_gpiod_request_cd(host->mmc, "cd", 0, false, 0, NULL);
	102	if (ret == -EPROBE_DEFER)
	103	goto disable_clk;
b42b9b12	104
c63b3cba	105	ret = sdhci_add_host(host);
fb8617e1	106	if (ret)
fcdb7c8f	107	goto disable_clk;
c63b3cba VK	108
	109	platform_set_drvdata(pdev, host);
	110
c63b3cba VK	111	return 0;
c63b3cba VK	112
6ebaf8f2	113	disable_clk:
da764f97	114	clk_disable_unprepare(sdhci->clk);
fcdb7c8f RK	115	err_host:
fcdb7c8f RK	116	sdhci_free_host(host);
c63b3cba VK	117	err:
	118	dev_err(&pdev->dev, "spear-sdhci probe failed: %d\n", ret);
	119	return ret;
	120	}
	121
6e0ee714	122	static int sdhci_remove(struct platform_device *pdev)
c63b3cba VK	123	{
c63b3cba VK	124	struct sdhci_host *host = platform_get_drvdata(pdev);
fcdb7c8f	125	struct spear_sdhci *sdhci = sdhci_priv(host);
6ebaf8f2	126	int dead = 0;
c63b3cba VK	127	u32 scratch;
c63b3cba VK	128
c63b3cba VK	129	scratch = readl(host->ioaddr + SDHCI_INT_STATUS);
	130	if (scratch == (u32)-1)
	131	dead = 1;
	132
	133	sdhci_remove_host(host, dead);
da764f97	134	clk_disable_unprepare(sdhci->clk);
fcdb7c8f	135	sdhci_free_host(host);
c63b3cba VK	136
	137	return 0;
	138	}
	139
b0dd099c	140	#ifdef CONFIG_PM_SLEEP
b70a7fab VK	141	static int sdhci_suspend(struct device *dev)
	142	{
	143	struct sdhci_host *host = dev_get_drvdata(dev);
fcdb7c8f	144	struct spear_sdhci *sdhci = sdhci_priv(host);
b70a7fab VK	145	int ret;
b70a7fab VK	146
d38dcad4 AH	147	if (host->tuning_mode != SDHCI_TUNING_MODE_3)
	148	mmc_retune_needed(host->mmc);
	149
984589e5	150	ret = sdhci_suspend_host(host);
b70a7fab	151	if (!ret)
06960a1b	152	clk_disable(sdhci->clk);
b70a7fab VK	153
	154	return ret;
	155	}
	156
	157	static int sdhci_resume(struct device *dev)
	158	{
	159	struct sdhci_host *host = dev_get_drvdata(dev);
fcdb7c8f	160	struct spear_sdhci *sdhci = sdhci_priv(host);
b70a7fab VK	161	int ret;
b70a7fab VK	162
06960a1b	163	ret = clk_enable(sdhci->clk);
b70a7fab VK	164	if (ret) {
	165	dev_dbg(dev, "Resume: Error enabling clock\n");
	166	return ret;
	167	}
	168
	169	return sdhci_resume_host(host);
	170	}
b70a7fab VK	171	#endif
b70a7fab VK	172
4b1a6170 SH	173	static SIMPLE_DEV_PM_OPS(sdhci_pm_ops, sdhci_suspend, sdhci_resume);
4b1a6170 SH	174
067bf748 VK	175	#ifdef CONFIG_OF
	176	static const struct of_device_id sdhci_spear_id_table[] = {
	177	{ .compatible = "st,spear300-sdhci" },
	178	{}
	179	};
	180	MODULE_DEVICE_TABLE(of, sdhci_spear_id_table);
	181	#endif
	182
c63b3cba VK	183	static struct platform_driver sdhci_driver = {
	184	.driver = {
	185	.name = "sdhci",
b70a7fab	186	.pm = &sdhci_pm_ops,
067bf748	187	.of_match_table = of_match_ptr(sdhci_spear_id_table),
c63b3cba VK	188	},
c63b3cba VK	189	.probe = sdhci_probe,
0433c143	190	.remove = sdhci_remove,
c63b3cba VK	191	};
c63b3cba VK	192
d1f81a64	193	module_platform_driver(sdhci_driver);
c63b3cba VK	194
c63b3cba VK	195	MODULE_DESCRIPTION("SPEAr Secure Digital Host Controller Interface driver");
da89947b	196	MODULE_AUTHOR("Viresh Kumar <vireshk@kernel.org>");
c63b3cba	197	MODULE_LICENSE("GPL v2");