[mirror_ubuntu-zesty-kernel.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 = {
	.set_clock = sdhci_set_clock,
	.get_max_clock	= sdhci_sirf_get_max_clk,
	.set_bus_width = sdhci_set_bus_width,
	.reset = sdhci_reset,
	.set_uhs_signaling = sdhci_set_uhs_signaling,
};

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 = {
1771059c	31	.set_clock = sdhci_set_clock,
b3b665b0	32	.get_max_clock = sdhci_sirf_get_max_clk,
2317f56c	33	.set_bus_width = sdhci_set_bus_width,
03231f9b	34	.reset = sdhci_reset,
96d7b78c	35	.set_uhs_signaling = sdhci_set_uhs_signaling,
b3b665b0 BS	36	};
	37
	38	static struct sdhci_pltfm_data sdhci_sirf_pdata = {
	39	.ops = &sdhci_sirf_ops,
	40	.quirks = SDHCI_QUIRK_BROKEN_TIMEOUT_VAL \|
	41	SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK \|
	42	SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN \|
	43	SDHCI_QUIRK_INVERTED_WRITE_PROTECT \|
	44	SDHCI_QUIRK_DELAY_AFTER_POWER,
	45	};
	46
	47	static int sdhci_sirf_probe(struct platform_device *pdev)
	48	{
	49	struct sdhci_host *host;
	50	struct sdhci_pltfm_host *pltfm_host;
	51	struct sdhci_sirf_priv *priv;
e2f6aac6 AB	52	struct clk *clk;
e2f6aac6 AB	53	int gpio_cd;
b3b665b0	54	int ret;
b3b665b0	55
e2f6aac6 AB	56	clk = devm_clk_get(&pdev->dev, NULL);
e2f6aac6 AB	57	if (IS_ERR(clk)) {
b3b665b0	58	dev_err(&pdev->dev, "unable to get clock");
e2f6aac6	59	return PTR_ERR(clk);
b3b665b0 BS	60	}
b3b665b0 BS	61
e2f6aac6 AB	62	if (pdev->dev.of_node)
	63	gpio_cd = of_get_named_gpio(pdev->dev.of_node, "cd-gpios", 0);
	64	else
	65	gpio_cd = -EINVAL;
b3b665b0	66
e2f6aac6 AB	67	host = sdhci_pltfm_init(pdev, &sdhci_sirf_pdata, sizeof(struct sdhci_sirf_priv));
	68	if (IS_ERR(host))
	69	return PTR_ERR(host);
b3b665b0 BS	70
b3b665b0 BS	71	pltfm_host = sdhci_priv(host);
e2f6aac6 AB	72	priv = sdhci_pltfm_priv(pltfm_host);
	73	priv->clk = clk;
	74	priv->gpio_cd = gpio_cd;
b3b665b0 BS	75
	76	sdhci_get_of_property(pdev);
	77
e2f6aac6 AB	78	ret = clk_prepare_enable(priv->clk);
	79	if (ret)
	80	goto err_clk_prepare;
b3b665b0 BS	81
	82	ret = sdhci_add_host(host);
	83	if (ret)
	84	goto err_sdhci_add;
	85
	86	/*
	87	* We must request the IRQ after sdhci_add_host(), as the tasklet only
	88	* gets setup in sdhci_add_host() and we oops.
	89	*/
	90	if (gpio_is_valid(priv->gpio_cd)) {
214fc309	91	ret = mmc_gpio_request_cd(host->mmc, priv->gpio_cd, 0);
b3b665b0 BS	92	if (ret) {
	93	dev_err(&pdev->dev, "card detect irq request failed: %d\n",
	94	ret);
	95	goto err_request_cd;
	96	}
	97	}
	98
	99	return 0;
	100
	101	err_request_cd:
	102	sdhci_remove_host(host, 0);
	103	err_sdhci_add:
	104	clk_disable_unprepare(priv->clk);
e2f6aac6	105	err_clk_prepare:
b3b665b0	106	sdhci_pltfm_free(pdev);
b3b665b0 BS	107	return ret;
	108	}
	109
	110	static int sdhci_sirf_remove(struct platform_device *pdev)
	111	{
	112	struct sdhci_host *host = platform_get_drvdata(pdev);
	113	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
e2f6aac6	114	struct sdhci_sirf_priv *priv = sdhci_pltfm_priv(pltfm_host);
b3b665b0 BS	115
	116	sdhci_pltfm_unregister(pdev);
	117
	118	if (gpio_is_valid(priv->gpio_cd))
	119	mmc_gpio_free_cd(host->mmc);
	120
	121	clk_disable_unprepare(priv->clk);
	122	return 0;
	123	}
	124
	125	#ifdef CONFIG_PM_SLEEP
	126	static int sdhci_sirf_suspend(struct device *dev)
	127	{
	128	struct sdhci_host *host = dev_get_drvdata(dev);
	129	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
e2f6aac6	130	struct sdhci_sirf_priv *priv = sdhci_pltfm_priv(pltfm_host);
b3b665b0 BS	131	int ret;
	132
	133	ret = sdhci_suspend_host(host);
	134	if (ret)
	135	return ret;
	136
	137	clk_disable(priv->clk);
	138
	139	return 0;
	140	}
	141
	142	static int sdhci_sirf_resume(struct device *dev)
	143	{
	144	struct sdhci_host *host = dev_get_drvdata(dev);
	145	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
e2f6aac6	146	struct sdhci_sirf_priv *priv = sdhci_pltfm_priv(pltfm_host);
b3b665b0 BS	147	int ret;
	148
	149	ret = clk_enable(priv->clk);
	150	if (ret) {
	151	dev_dbg(dev, "Resume: Error enabling clock\n");
	152	return ret;
	153	}
	154
	155	return sdhci_resume_host(host);
	156	}
	157
	158	static SIMPLE_DEV_PM_OPS(sdhci_sirf_pm_ops, sdhci_sirf_suspend, sdhci_sirf_resume);
	159	#endif
	160
	161	static const struct of_device_id sdhci_sirf_of_match[] = {
	162	{ .compatible = "sirf,prima2-sdhc" },
	163	{ }
	164	};
	165	MODULE_DEVICE_TABLE(of, sdhci_sirf_of_match);
	166
	167	static struct platform_driver sdhci_sirf_driver = {
	168	.driver = {
	169	.name = "sdhci-sirf",
	170	.owner = THIS_MODULE,
	171	.of_match_table = sdhci_sirf_of_match,
	172	#ifdef CONFIG_PM_SLEEP
	173	.pm = &sdhci_sirf_pm_ops,
	174	#endif
	175	},
	176	.probe = sdhci_sirf_probe,
	177	.remove = sdhci_sirf_remove,
	178	};
	179
	180	module_platform_driver(sdhci_sirf_driver);
	181
	182	MODULE_DESCRIPTION("SDHCI driver for SiRFprimaII/SiRFmarco");
	183	MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
	184	MODULE_LICENSE("GPL v2");