[deliverable/linux.git] / drivers / mmc / host / sdhci-sirf.c

/*
 * SDHCI support for SiRF primaII and marco SoCs
 *
 * Copyright (c) 2011 Cambridge Silicon Radio Limited, a CSR plc group company.
 *
 * Licensed under GPLv2 or later.
 */

#include <linux/delay.h>
#include <linux/device.h>
#include <linux/mmc/host.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_gpio.h>
#include <linux/mmc/slot-gpio.h>
#include "sdhci-pltfm.h"

struct sdhci_sirf_priv {
	struct clk *clk;
	int gpio_cd;
};

static unsigned int sdhci_sirf_get_max_clk(struct sdhci_host *host)
{
	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
	struct sdhci_sirf_priv *priv = sdhci_pltfm_priv(pltfm_host);
	return clk_get_rate(priv->clk);
}

static struct sdhci_ops sdhci_sirf_ops = {
	.get_max_clock	= sdhci_sirf_get_max_clk,
	.set_bus_width = sdhci_set_bus_width,
	.reset = sdhci_reset,
};

static struct sdhci_pltfm_data sdhci_sirf_pdata = {
	.ops = &sdhci_sirf_ops,
	.quirks = SDHCI_QUIRK_BROKEN_TIMEOUT_VAL |
		SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK |
		SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN |
		SDHCI_QUIRK_INVERTED_WRITE_PROTECT |
		SDHCI_QUIRK_DELAY_AFTER_POWER,
};

static int sdhci_sirf_probe(struct platform_device *pdev)
{
	struct sdhci_host *host;
	struct sdhci_pltfm_host *pltfm_host;
	struct sdhci_sirf_priv *priv;
	struct clk *clk;
	int gpio_cd;
	int ret;

	clk = devm_clk_get(&pdev->dev, NULL);
	if (IS_ERR(clk)) {
		dev_err(&pdev->dev, "unable to get clock");
		return PTR_ERR(clk);
	}

	if (pdev->dev.of_node)
		gpio_cd = of_get_named_gpio(pdev->dev.of_node, "cd-gpios", 0);
	else
		gpio_cd = -EINVAL;

	host = sdhci_pltfm_init(pdev, &sdhci_sirf_pdata, sizeof(struct sdhci_sirf_priv));
	if (IS_ERR(host))
		return PTR_ERR(host);

	pltfm_host = sdhci_priv(host);
	priv = sdhci_pltfm_priv(pltfm_host);
	priv->clk = clk;
	priv->gpio_cd = gpio_cd;

	sdhci_get_of_property(pdev);

	ret = clk_prepare_enable(priv->clk);
	if (ret)
		goto err_clk_prepare;

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

	/*
	 * We must request the IRQ after sdhci_add_host(), as the tasklet only
	 * gets setup in sdhci_add_host() and we oops.
	 */
	if (gpio_is_valid(priv->gpio_cd)) {
		ret = mmc_gpio_request_cd(host->mmc, priv->gpio_cd, 0);
		if (ret) {
			dev_err(&pdev->dev, "card detect irq request failed: %d\n",
				ret);
			goto err_request_cd;
		}
	}

	return 0;

err_request_cd:
	sdhci_remove_host(host, 0);
err_sdhci_add:
	clk_disable_unprepare(priv->clk);
err_clk_prepare:
	sdhci_pltfm_free(pdev);
	return ret;
}

static int sdhci_sirf_remove(struct platform_device *pdev)
{
	struct sdhci_host *host = platform_get_drvdata(pdev);
	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
	struct sdhci_sirf_priv *priv = sdhci_pltfm_priv(pltfm_host);

	sdhci_pltfm_unregister(pdev);

	if (gpio_is_valid(priv->gpio_cd))
		mmc_gpio_free_cd(host->mmc);

	clk_disable_unprepare(priv->clk);
	return 0;
}

#ifdef CONFIG_PM_SLEEP
static int sdhci_sirf_suspend(struct device *dev)
{
	struct sdhci_host *host = dev_get_drvdata(dev);
	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
	struct sdhci_sirf_priv *priv = sdhci_pltfm_priv(pltfm_host);
	int ret;

	ret = sdhci_suspend_host(host);
	if (ret)
		return ret;

	clk_disable(priv->clk);

	return 0;
}

static int sdhci_sirf_resume(struct device *dev)
{
	struct sdhci_host *host = dev_get_drvdata(dev);
	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
	struct sdhci_sirf_priv *priv = sdhci_pltfm_priv(pltfm_host);
	int ret;

	ret = clk_enable(priv->clk);
	if (ret) {
		dev_dbg(dev, "Resume: Error enabling clock\n");
		return ret;
	}

	return sdhci_resume_host(host);
}

static SIMPLE_DEV_PM_OPS(sdhci_sirf_pm_ops, sdhci_sirf_suspend, sdhci_sirf_resume);
#endif

static const struct of_device_id sdhci_sirf_of_match[] = {
	{ .compatible = "sirf,prima2-sdhc" },
	{ }
};
MODULE_DEVICE_TABLE(of, sdhci_sirf_of_match);

static struct platform_driver sdhci_sirf_driver = {
	.driver		= {
		.name	= "sdhci-sirf",
		.owner	= THIS_MODULE,
		.of_match_table = sdhci_sirf_of_match,
#ifdef CONFIG_PM_SLEEP
		.pm	= &sdhci_sirf_pm_ops,
#endif
	},
	.probe		= sdhci_sirf_probe,
	.remove		= sdhci_sirf_remove,
};

module_platform_driver(sdhci_sirf_driver);

MODULE_DESCRIPTION("SDHCI driver for SiRFprimaII/SiRFmarco");
MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
b3b665b0 BS	1	/*
	2	* SDHCI support for SiRF primaII and marco SoCs
	3	*
	4	* Copyright (c) 2011 Cambridge Silicon Radio Limited, a CSR plc group company.
	5	*
	6	* Licensed under GPLv2 or later.
	7	*/
	8
	9	#include <linux/delay.h>
	10	#include <linux/device.h>
	11	#include <linux/mmc/host.h>
	12	#include <linux/module.h>
	13	#include <linux/of.h>
	14	#include <linux/of_gpio.h>
	15	#include <linux/mmc/slot-gpio.h>
b3b665b0 BS	16	#include "sdhci-pltfm.h"
	17
	18	struct sdhci_sirf_priv {
	19	struct clk *clk;
	20	int gpio_cd;
	21	};
	22
	23	static unsigned int sdhci_sirf_get_max_clk(struct sdhci_host *host)
	24	{
	25	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
e2f6aac6	26	struct sdhci_sirf_priv *priv = sdhci_pltfm_priv(pltfm_host);
b3b665b0 BS	27	return clk_get_rate(priv->clk);
	28	}
	29
	30	static struct sdhci_ops sdhci_sirf_ops = {
	31	.get_max_clock = sdhci_sirf_get_max_clk,
2317f56c	32	.set_bus_width = sdhci_set_bus_width,
03231f9b	33	.reset = sdhci_reset,
b3b665b0 BS	34	};
	35
	36	static struct sdhci_pltfm_data sdhci_sirf_pdata = {
	37	.ops = &sdhci_sirf_ops,
	38	.quirks = SDHCI_QUIRK_BROKEN_TIMEOUT_VAL \|
	39	SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK \|
	40	SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN \|
	41	SDHCI_QUIRK_INVERTED_WRITE_PROTECT \|
	42	SDHCI_QUIRK_DELAY_AFTER_POWER,
	43	};
	44
	45	static int sdhci_sirf_probe(struct platform_device *pdev)
	46	{
	47	struct sdhci_host *host;
	48	struct sdhci_pltfm_host *pltfm_host;
	49	struct sdhci_sirf_priv *priv;
e2f6aac6 AB	50	struct clk *clk;
e2f6aac6 AB	51	int gpio_cd;
b3b665b0	52	int ret;
b3b665b0	53
e2f6aac6 AB	54	clk = devm_clk_get(&pdev->dev, NULL);
e2f6aac6 AB	55	if (IS_ERR(clk)) {
b3b665b0	56	dev_err(&pdev->dev, "unable to get clock");
e2f6aac6	57	return PTR_ERR(clk);
b3b665b0 BS	58	}
b3b665b0 BS	59
e2f6aac6 AB	60	if (pdev->dev.of_node)
	61	gpio_cd = of_get_named_gpio(pdev->dev.of_node, "cd-gpios", 0);
	62	else
	63	gpio_cd = -EINVAL;
b3b665b0	64
e2f6aac6 AB	65	host = sdhci_pltfm_init(pdev, &sdhci_sirf_pdata, sizeof(struct sdhci_sirf_priv));
	66	if (IS_ERR(host))
	67	return PTR_ERR(host);
b3b665b0 BS	68
b3b665b0 BS	69	pltfm_host = sdhci_priv(host);
e2f6aac6 AB	70	priv = sdhci_pltfm_priv(pltfm_host);
	71	priv->clk = clk;
	72	priv->gpio_cd = gpio_cd;
b3b665b0 BS	73
	74	sdhci_get_of_property(pdev);
	75
e2f6aac6 AB	76	ret = clk_prepare_enable(priv->clk);
	77	if (ret)
	78	goto err_clk_prepare;
b3b665b0 BS	79
	80	ret = sdhci_add_host(host);
	81	if (ret)
	82	goto err_sdhci_add;
	83
	84	/*
	85	* We must request the IRQ after sdhci_add_host(), as the tasklet only
	86	* gets setup in sdhci_add_host() and we oops.
	87	*/
	88	if (gpio_is_valid(priv->gpio_cd)) {
214fc309	89	ret = mmc_gpio_request_cd(host->mmc, priv->gpio_cd, 0);
b3b665b0 BS	90	if (ret) {
	91	dev_err(&pdev->dev, "card detect irq request failed: %d\n",
	92	ret);
	93	goto err_request_cd;
	94	}
	95	}
	96
	97	return 0;
	98
	99	err_request_cd:
	100	sdhci_remove_host(host, 0);
	101	err_sdhci_add:
	102	clk_disable_unprepare(priv->clk);
e2f6aac6	103	err_clk_prepare:
b3b665b0	104	sdhci_pltfm_free(pdev);
b3b665b0 BS	105	return ret;
	106	}
	107
	108	static int sdhci_sirf_remove(struct platform_device *pdev)
	109	{
	110	struct sdhci_host *host = platform_get_drvdata(pdev);
	111	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
e2f6aac6	112	struct sdhci_sirf_priv *priv = sdhci_pltfm_priv(pltfm_host);
b3b665b0 BS	113
	114	sdhci_pltfm_unregister(pdev);
	115
	116	if (gpio_is_valid(priv->gpio_cd))
	117	mmc_gpio_free_cd(host->mmc);
	118
	119	clk_disable_unprepare(priv->clk);
	120	return 0;
	121	}
	122
	123	#ifdef CONFIG_PM_SLEEP
	124	static int sdhci_sirf_suspend(struct device *dev)
	125	{
	126	struct sdhci_host *host = dev_get_drvdata(dev);
	127	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
e2f6aac6	128	struct sdhci_sirf_priv *priv = sdhci_pltfm_priv(pltfm_host);
b3b665b0 BS	129	int ret;
	130
	131	ret = sdhci_suspend_host(host);
	132	if (ret)
	133	return ret;
	134
	135	clk_disable(priv->clk);
	136
	137	return 0;
	138	}
	139
	140	static int sdhci_sirf_resume(struct device *dev)
	141	{
	142	struct sdhci_host *host = dev_get_drvdata(dev);
	143	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
e2f6aac6	144	struct sdhci_sirf_priv *priv = sdhci_pltfm_priv(pltfm_host);
b3b665b0 BS	145	int ret;
	146
	147	ret = clk_enable(priv->clk);
	148	if (ret) {
	149	dev_dbg(dev, "Resume: Error enabling clock\n");
	150	return ret;
	151	}
	152
	153	return sdhci_resume_host(host);
	154	}
	155
	156	static SIMPLE_DEV_PM_OPS(sdhci_sirf_pm_ops, sdhci_sirf_suspend, sdhci_sirf_resume);
	157	#endif
	158
	159	static const struct of_device_id sdhci_sirf_of_match[] = {
	160	{ .compatible = "sirf,prima2-sdhc" },
	161	{ }
	162	};
	163	MODULE_DEVICE_TABLE(of, sdhci_sirf_of_match);
	164
	165	static struct platform_driver sdhci_sirf_driver = {
	166	.driver = {
	167	.name = "sdhci-sirf",
	168	.owner = THIS_MODULE,
	169	.of_match_table = sdhci_sirf_of_match,
	170	#ifdef CONFIG_PM_SLEEP
	171	.pm = &sdhci_sirf_pm_ops,
	172	#endif
	173	},
	174	.probe = sdhci_sirf_probe,
	175	.remove = sdhci_sirf_remove,
	176	};
	177
	178	module_platform_driver(sdhci_sirf_driver);
	179
	180	MODULE_DESCRIPTION("SDHCI driver for SiRFprimaII/SiRFmarco");
	181	MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
	182	MODULE_LICENSE("GPL v2");