[linux-2.6-block.git] / drivers / mmc / host / sdhci-st.c

/*
 * Support for SDHCI on STMicroelectronics SoCs
 *
 * Copyright (C) 2014 STMicroelectronics Ltd
 * Author: Giuseppe Cavallaro <peppe.cavallaro@st.com>
 * Contributors: Peter Griffin <peter.griffin@linaro.org>
 *
 * Based on sdhci-cns3xxx.c
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 */

#include <linux/io.h>
#include <linux/of.h>
#include <linux/module.h>
#include <linux/err.h>
#include <linux/mmc/host.h>

#include "sdhci-pltfm.h"

static u32 sdhci_st_readl(struct sdhci_host *host, int reg)
{
	u32 ret;

	switch (reg) {
	case SDHCI_CAPABILITIES:
		ret = readl_relaxed(host->ioaddr + reg);
		/* Support 3.3V and 1.8V */
		ret &= ~SDHCI_CAN_VDD_300;
		break;
	default:
		ret = readl_relaxed(host->ioaddr + reg);
	}
	return ret;
}

static const struct sdhci_ops sdhci_st_ops = {
	.get_max_clock = sdhci_pltfm_clk_get_max_clock,
	.set_clock = sdhci_set_clock,
	.set_bus_width = sdhci_set_bus_width,
	.read_l = sdhci_st_readl,
	.reset = sdhci_reset,
};

static const struct sdhci_pltfm_data sdhci_st_pdata = {
	.ops = &sdhci_st_ops,
	.quirks = SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC |
	    SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN,
};


static int sdhci_st_probe(struct platform_device *pdev)
{
	struct sdhci_host *host;
	struct sdhci_pltfm_host *pltfm_host;
	struct clk *clk;
	int ret = 0;
	u16 host_version;

	clk =  devm_clk_get(&pdev->dev, "mmc");
	if (IS_ERR(clk)) {
		dev_err(&pdev->dev, "Peripheral clk not found\n");
		return PTR_ERR(clk);
	}

	host = sdhci_pltfm_init(pdev, &sdhci_st_pdata, 0);
	if (IS_ERR(host)) {
		dev_err(&pdev->dev, "Failed sdhci_pltfm_init\n");
		return PTR_ERR(host);
	}

	ret = mmc_of_parse(host->mmc);

	if (ret) {
		dev_err(&pdev->dev, "Failed mmc_of_parse\n");
		return ret;
	}

	clk_prepare_enable(clk);

	pltfm_host = sdhci_priv(host);
	pltfm_host->clk = clk;

	ret = sdhci_add_host(host);
	if (ret) {
		dev_err(&pdev->dev, "Failed sdhci_add_host\n");
		goto err_out;
	}

	platform_set_drvdata(pdev, host);

	host_version = readw_relaxed((host->ioaddr + SDHCI_HOST_VERSION));

	dev_info(&pdev->dev, "SDHCI ST Initialised: Host Version: 0x%x Vendor Version 0x%x\n",
		((host_version & SDHCI_SPEC_VER_MASK) >> SDHCI_SPEC_VER_SHIFT),
		((host_version & SDHCI_VENDOR_VER_MASK) >>
		SDHCI_VENDOR_VER_SHIFT));

	return 0;

err_out:
	clk_disable_unprepare(clk);
	sdhci_pltfm_free(pdev);

	return ret;
}

static int sdhci_st_remove(struct platform_device *pdev)
{
	struct sdhci_host *host = platform_get_drvdata(pdev);
	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);

	clk_disable_unprepare(pltfm_host->clk);

	return sdhci_pltfm_unregister(pdev);
}

#ifdef CONFIG_PM_SLEEP
static int sdhci_st_suspend(struct device *dev)
{
	struct sdhci_host *host = dev_get_drvdata(dev);
	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
	int ret = sdhci_suspend_host(host);

	if (ret)
		goto out;

	clk_disable_unprepare(pltfm_host->clk);
out:
	return ret;
}

static int sdhci_st_resume(struct device *dev)
{
	struct sdhci_host *host = dev_get_drvdata(dev);
	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);

	clk_prepare_enable(pltfm_host->clk);

	return sdhci_resume_host(host);
}
#endif

static SIMPLE_DEV_PM_OPS(sdhci_st_pmops, sdhci_st_suspend, sdhci_st_resume);

static const struct of_device_id st_sdhci_match[] = {
	{ .compatible = "st,sdhci" },
	{},
};

MODULE_DEVICE_TABLE(of, st_sdhci_match);

static struct platform_driver sdhci_st_driver = {
	.probe = sdhci_st_probe,
	.remove = sdhci_st_remove,
	.driver = {
		   .name = "sdhci-st",
		   .pm = &sdhci_st_pmops,
		   .of_match_table = of_match_ptr(st_sdhci_match),
		  },
};

module_platform_driver(sdhci_st_driver);

MODULE_DESCRIPTION("SDHCI driver for STMicroelectronics SoCs");
MODULE_AUTHOR("Giuseppe Cavallaro <peppe.cavallaro@st.com>");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:st-sdhci");
Commit	Line	Data
f52d9c4f PG	1	/*
	2	* Support for SDHCI on STMicroelectronics SoCs
	3	*
	4	* Copyright (C) 2014 STMicroelectronics Ltd
	5	* Author: Giuseppe Cavallaro <peppe.cavallaro@st.com>
	6	* Contributors: Peter Griffin <peter.griffin@linaro.org>
	7	*
	8	* Based on sdhci-cns3xxx.c
	9	*
	10	* This program is free software; you can redistribute it and/or modify
	11	* it under the terms of the GNU General Public License version 2 as
	12	* published by the Free Software Foundation.
	13	*
	14	* This program is distributed in the hope that it will be useful,
	15	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	16	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	17	* GNU General Public License for more details.
	18	*
	19	*/
	20
	21	#include <linux/io.h>
	22	#include <linux/of.h>
	23	#include <linux/module.h>
	24	#include <linux/err.h>
	25	#include <linux/mmc/host.h>
	26
	27	#include "sdhci-pltfm.h"
	28
	29	static u32 sdhci_st_readl(struct sdhci_host *host, int reg)
	30	{
	31	u32 ret;
	32
	33	switch (reg) {
	34	case SDHCI_CAPABILITIES:
	35	ret = readl_relaxed(host->ioaddr + reg);
	36	/* Support 3.3V and 1.8V */
	37	ret &= ~SDHCI_CAN_VDD_300;
	38	break;
	39	default:
	40	ret = readl_relaxed(host->ioaddr + reg);
	41	}
	42	return ret;
	43	}
	44
	45	static const struct sdhci_ops sdhci_st_ops = {
	46	.get_max_clock = sdhci_pltfm_clk_get_max_clock,
	47	.set_clock = sdhci_set_clock,
	48	.set_bus_width = sdhci_set_bus_width,
	49	.read_l = sdhci_st_readl,
	50	.reset = sdhci_reset,
	51	};
	52
	53	static const struct sdhci_pltfm_data sdhci_st_pdata = {
	54	.ops = &sdhci_st_ops,
	55	.quirks = SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC \|
	56	SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN,
	57	};
	58
	59
	60	static int sdhci_st_probe(struct platform_device *pdev)
	61	{
	62	struct sdhci_host *host;
	63	struct sdhci_pltfm_host *pltfm_host;
	64	struct clk *clk;
65	int ret = 0;
66	u16 host_version;
67
68	clk = devm_clk_get(&pdev->dev, "mmc");
69	if (IS_ERR(clk)) {
70	dev_err(&pdev->dev, "Peripheral clk not found\n");
71	return PTR_ERR(clk);
72	}
73
74	host = sdhci_pltfm_init(pdev, &sdhci_st_pdata, 0);
75	if (IS_ERR(host)) {
76	dev_err(&pdev->dev, "Failed sdhci_pltfm_init\n");
77	return PTR_ERR(host);
78	}
79
80	ret = mmc_of_parse(host->mmc);
81
82	if (ret) {
83	dev_err(&pdev->dev, "Failed mmc_of_parse\n");
84	return ret;
85	}
86
87	clk_prepare_enable(clk);
88
89	pltfm_host = sdhci_priv(host);
90	pltfm_host->clk = clk;
91
92	ret = sdhci_add_host(host);
93	if (ret) {
94	dev_err(&pdev->dev, "Failed sdhci_add_host\n");
95	goto err_out;
96	}
97
98	platform_set_drvdata(pdev, host);
99
100	host_version = readw_relaxed((host->ioaddr + SDHCI_HOST_VERSION));
101
102	dev_info(&pdev->dev, "SDHCI ST Initialised: Host Version: 0x%x Vendor Version 0x%x\n",
103	((host_version & SDHCI_SPEC_VER_MASK) >> SDHCI_SPEC_VER_SHIFT),
104	((host_version & SDHCI_VENDOR_VER_MASK) >>
105	SDHCI_VENDOR_VER_SHIFT));
106
107	return 0;
108
109	err_out:
110	clk_disable_unprepare(clk);
111	sdhci_pltfm_free(pdev);
112
113	return ret;
114	}
115
116	static int sdhci_st_remove(struct platform_device *pdev)
117	{
118	struct sdhci_host *host = platform_get_drvdata(pdev);
119	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
120
121	clk_disable_unprepare(pltfm_host->clk);
122
123	return sdhci_pltfm_unregister(pdev);
124	}
125
126	#ifdef CONFIG_PM_SLEEP
127	static int sdhci_st_suspend(struct device *dev)
128	{
129	struct sdhci_host *host = dev_get_drvdata(dev);
130	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
131	int ret = sdhci_suspend_host(host);
132
133	if (ret)
134	goto out;
135
136	clk_disable_unprepare(pltfm_host->clk);
137	out:
138	return ret;
139	}
140
141	static int sdhci_st_resume(struct device *dev)
142	{
143	struct sdhci_host *host = dev_get_drvdata(dev);
144	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
145
146	clk_prepare_enable(pltfm_host->clk);
147
148	return sdhci_resume_host(host);
149	}
150	#endif
151
152	static SIMPLE_DEV_PM_OPS(sdhci_st_pmops, sdhci_st_suspend, sdhci_st_resume);
153
154	static const struct of_device_id st_sdhci_match[] = {
155	{ .compatible = "st,sdhci" },
156	{},
157	};
158
159	MODULE_DEVICE_TABLE(of, st_sdhci_match);
160
161	static struct platform_driver sdhci_st_driver = {
162	.probe = sdhci_st_probe,
163	.remove = sdhci_st_remove,
164	.driver = {
165	.name = "sdhci-st",
166	.pm = &sdhci_st_pmops,
167	.of_match_table = of_match_ptr(st_sdhci_match),
168	},
169	};
170
171	module_platform_driver(sdhci_st_driver);
172
173	MODULE_DESCRIPTION("SDHCI driver for STMicroelectronics SoCs");
174	MODULE_AUTHOR("Giuseppe Cavallaro <peppe.cavallaro@st.com>");
175	MODULE_LICENSE("GPL v2");
176	MODULE_ALIAS("platform:st-sdhci");