summaryrefslogtreecommitdiffstats
path: root/drivers/mmc/host/sdhci-pxa.c
blob: fc406ac5d1933166e9f08757a936d285f2843170 (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
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
/* linux/drivers/mmc/host/sdhci-pxa.c
 *
 * Copyright (C) 2010 Marvell International Ltd.
 *		Zhangfei Gao <zhangfei.gao@marvell.com>
 *		Kevin Wang <dwang4@marvell.com>
 *		Mingwei Wang <mwwang@marvell.com>
 *		Philip Rakity <prakity@marvell.com>
 *		Mark Brown <markb@marvell.com>
 *
 * 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.
 */

/* Supports:
 * SDHCI support for MMP2/PXA910/PXA168
 *
 * Refer to sdhci-s3c.c.
 */

#include <linux/delay.h>
#include <linux/platform_device.h>
#include <linux/mmc/host.h>
#include <linux/clk.h>
#include <linux/io.h>
#include <linux/err.h>
#include <plat/sdhci.h>
#include "sdhci.h"

#define DRIVER_NAME	"sdhci-pxa"

#define SD_FIFO_PARAM		0x104
#define DIS_PAD_SD_CLK_GATE	0x400

struct sdhci_pxa {
	struct sdhci_host		*host;
	struct sdhci_pxa_platdata	*pdata;
	struct clk			*clk;
	struct resource			*res;

	u8 clk_enable;
};

/*****************************************************************************\
 *                                                                           *
 * SDHCI core callbacks                                                      *
 *                                                                           *
\*****************************************************************************/
static void set_clock(struct sdhci_host *host, unsigned int clock)
{
	struct sdhci_pxa *pxa = sdhci_priv(host);
	u32 tmp = 0;

	if (clock == 0) {
		if (pxa->clk_enable) {
			clk_disable(pxa->clk);
			pxa->clk_enable = 0;
		}
	} else {
		if (0 == pxa->clk_enable) {
			if (pxa->pdata->flags & PXA_FLAG_DISABLE_CLOCK_GATING) {
				tmp = readl(host->ioaddr + SD_FIFO_PARAM);
				tmp |= DIS_PAD_SD_CLK_GATE;
				writel(tmp, host->ioaddr + SD_FIFO_PARAM);
			}
			clk_enable(pxa->clk);
			pxa->clk_enable = 1;
		}
	}
}

static struct sdhci_ops sdhci_pxa_ops = {
	.set_clock = set_clock,
};

/*****************************************************************************\
 *                                                                           *
 * Device probing/removal                                                    *
 *                                                                           *
\*****************************************************************************/

static int __devinit sdhci_pxa_probe(struct platform_device *pdev)
{
	struct sdhci_pxa_platdata *pdata = pdev->dev.platform_data;
	struct device *dev = &pdev->dev;
	struct sdhci_host *host = NULL;
	struct resource *iomem = NULL;
	struct sdhci_pxa *pxa = NULL;
	int ret, irq;

	irq = platform_get_irq(pdev, 0);
	if (irq < 0) {
		dev_err(dev, "no irq specified\n");
		return irq;
	}

	iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!iomem) {
		dev_err(dev, "no memory specified\n");
		return -ENOENT;
	}

	host = sdhci_alloc_host(&pdev->dev, sizeof(struct sdhci_pxa));
	if (IS_ERR(host)) {
		dev_err(dev, "failed to alloc host\n");
		return PTR_ERR(host);
	}

	pxa = sdhci_priv(host);
	pxa->host = host;
	pxa->pdata = pdata;
	pxa->clk_enable = 0;

	pxa->clk = clk_get(dev, "PXA-SDHCLK");
	if (IS_ERR(pxa->clk)) {
		dev_err(dev, "failed to get io clock\n");
		ret = PTR_ERR(pxa->clk);
		goto out;
	}

	pxa->res = request_mem_region(iomem->start, resource_size(iomem),
				      mmc_hostname(host->mmc));
	if (!pxa->res) {
		dev_err(&pdev->dev, "cannot request region\n");
		ret = -EBUSY;
		goto out;
	}

	host->ioaddr = ioremap(iomem->start, resource_size(iomem));
	if (!host->ioaddr) {
		dev_err(&pdev->dev, "failed to remap registers\n");
		ret = -ENOMEM;
		goto out;
	}

	host->hw_name = "MMC";
	host->ops = &sdhci_pxa_ops;
	host->irq = irq;
	host->quirks = SDHCI_QUIRK_BROKEN_ADMA | SDHCI_QUIRK_BROKEN_TIMEOUT_VAL;

	if (pdata->quirks)
		host->quirks |= pdata->quirks;

	ret = sdhci_add_host(host);
	if (ret) {
		dev_err(&pdev->dev, "failed to add host\n");
		goto out;
	}

	if (pxa->pdata->max_speed)
		host->mmc->f_max = pxa->pdata->max_speed;

	platform_set_drvdata(pdev, host);

	return 0;
out:
	if (host) {
		clk_put(pxa->clk);
		if (host->ioaddr)
			iounmap(host->ioaddr);
		if (pxa->res)
			release_mem_region(pxa->res->start,
					   resource_size(pxa->res));
		sdhci_free_host(host);
	}

	return ret;
}

static int __devexit sdhci_pxa_remove(struct platform_device *pdev)
{
	struct sdhci_host *host = platform_get_drvdata(pdev);
	struct sdhci_pxa *pxa = sdhci_priv(host);
	int dead = 0;
	u32 scratch;

	if (host) {
		scratch = readl(host->ioaddr + SDHCI_INT_STATUS);
		if (scratch == (u32)-1)
			dead = 1;

		sdhci_remove_host(host, dead);

		if (host->ioaddr)
			iounmap(host->ioaddr);
		if (pxa->res)
			release_mem_region(pxa->res->start,
					   resource_size(pxa->res));
		if (pxa->clk_enable) {
			clk_disable(pxa->clk);
			pxa->clk_enable = 0;
		}
		clk_put(pxa->clk);

		sdhci_free_host(host);
		platform_set_drvdata(pdev, NULL);
	}

	return 0;
}

#ifdef CONFIG_PM
static int sdhci_pxa_suspend(struct platform_device *dev, pm_message_t state)
{
	struct sdhci_host *host = platform_get_drvdata(dev);

	return sdhci_suspend_host(host, state);
}

static int sdhci_pxa_resume(struct platform_device *dev)
{
	struct sdhci_host *host = platform_get_drvdata(dev);

	return sdhci_resume_host(host);
}
#else
#define sdhci_pxa_suspend	NULL
#define sdhci_pxa_resume	NULL
#endif

static struct platform_driver sdhci_pxa_driver = {
	.probe		= sdhci_pxa_probe,
	.remove		= __devexit_p(sdhci_pxa_remove),
	.suspend	= sdhci_pxa_suspend,
	.resume		= sdhci_pxa_resume,
	.driver		= {
		.name	= DRIVER_NAME,
		.owner	= THIS_MODULE,
	},
};

/*****************************************************************************\
 *                                                                           *
 * Driver init/exit                                                          *
 *                                                                           *
\*****************************************************************************/

static int __init sdhci_pxa_init(void)
{
	return platform_driver_register(&sdhci_pxa_driver);
}

static void __exit sdhci_pxa_exit(void)
{
	platform_driver_unregister(&sdhci_pxa_driver);
}

module_init(sdhci_pxa_init);
module_exit(sdhci_pxa_exit);

MODULE_DESCRIPTION("SDH controller driver for PXA168/PXA910/MMP2");
MODULE_AUTHOR("Zhangfei Gao <zhangfei.gao@marvell.com>");
MODULE_LICENSE("GPL v2");
OpenPOWER on IntegriCloud