summaryrefslogtreecommitdiff
path: root/drivers/mmc/host/sdhci-sirf.c
blob: 16fcd48f9556cd3985df3b2af6affd02f234ce60 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
/*
 * 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,
};

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");