aboutsummaryrefslogtreecommitdiff
path: root/drivers/mmc/host/sdhci-pltfm.c
blob: c6c3b12435979c8237cb9f5f7c11f26f6cceac92 (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
254
255
256
257
258
259
260
261
/*
 * sdhci-pltfm.c Support for SDHCI platform devices
 * Copyright (c) 2009 Intel Corporation
 *
 * Copyright (c) 2007, 2011 Freescale Semiconductor, Inc.
 * Copyright (c) 2009 MontaVista Software, Inc.
 *
 * Authors: Xiaobo Xie <X.Xie@freescale.com>
 *	    Anton Vorontsov <avorontsov@ru.mvista.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.
 *
 * 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.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

/* Supports:
 * SDHCI platform devices
 *
 * Inspired by sdhci-pci.c, by Pierre Ossman
 */

#include <linux/err.h>
#include <linux/module.h>
#include <linux/of.h>
#ifdef CONFIG_PPC
#include <asm/machdep.h>
#endif
#include "sdhci-pltfm.h"

static struct sdhci_ops sdhci_pltfm_ops = {
};

#ifdef CONFIG_OF
static bool sdhci_of_wp_inverted(struct device_node *np)
{
	if (of_get_property(np, "sdhci,wp-inverted", NULL) ||
	    of_get_property(np, "wp-inverted", NULL))
		return true;

	/* Old device trees don't have the wp-inverted property. */
#ifdef CONFIG_PPC
	return machine_is(mpc837x_rdb) || machine_is(mpc837x_mds);
#else
	return false;
#endif /* CONFIG_PPC */
}

void sdhci_get_of_property(struct platform_device *pdev)
{
	struct device_node *np = pdev->dev.of_node;
	struct sdhci_host *host = platform_get_drvdata(pdev);
	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
	const __be32 *clk;
	u32 bus_width;
	int size;

	if (of_device_is_available(np)) {
		if (of_get_property(np, "sdhci,auto-cmd12", NULL))
			host->quirks |= SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12;

		if (of_get_property(np, "sdhci,1-bit-only", NULL) ||
		    (of_property_read_u32(np, "bus-width", &bus_width) == 0 &&
		    bus_width == 1))
			host->quirks |= SDHCI_QUIRK_FORCE_1_BIT_DATA;

		if (sdhci_of_wp_inverted(np))
			host->quirks |= SDHCI_QUIRK_INVERTED_WRITE_PROTECT;

		if (of_get_property(np, "broken-cd", NULL))
			host->quirks |= SDHCI_QUIRK_BROKEN_CARD_DETECTION;

		if (of_device_is_compatible(np, "fsl,p2020-rev1-esdhc"))
			host->quirks |= SDHCI_QUIRK_BROKEN_DMA;

		if (of_device_is_compatible(np, "fsl,p2020-esdhc") ||
		    of_device_is_compatible(np, "fsl,p1010-esdhc") ||
		    of_device_is_compatible(np, "fsl,mpc8536-esdhc"))
			host->quirks |= SDHCI_QUIRK_BROKEN_TIMEOUT_VAL;

		clk = of_get_property(np, "clock-frequency", &size);
		if (clk && size == sizeof(*clk) && *clk)
			pltfm_host->clock = be32_to_cpup(clk);

		if (of_find_property(np, "keep-power-in-suspend", NULL))
			host->mmc->pm_caps |= MMC_PM_KEEP_POWER;

		if (of_find_property(np, "enable-sdio-wakeup", NULL))
			host->mmc->pm_caps |= MMC_PM_WAKE_SDIO_IRQ;
	}
}
#else
void sdhci_get_of_property(struct platform_device *pdev) {}
#endif /* CONFIG_OF */
EXPORT_SYMBOL_GPL(sdhci_get_of_property);

struct sdhci_host *sdhci_pltfm_init(struct platform_device *pdev,
				    struct sdhci_pltfm_data *pdata)
{
	struct sdhci_host *host;
	struct sdhci_pltfm_host *pltfm_host;
	struct device_node *np = pdev->dev.of_node;
	struct resource *iomem;
	int ret;

	iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!iomem) {
		ret = -ENOMEM;
		goto err;
	}

	if (resource_size(iomem) < 0x100)
		dev_err(&pdev->dev, "Invalid iomem size!\n");

	/* Some PCI-based MFD need the parent here */
	if (pdev->dev.parent != &platform_bus && !np)
		host = sdhci_alloc_host(pdev->dev.parent, sizeof(*pltfm_host));
	else
		host = sdhci_alloc_host(&pdev->dev, sizeof(*pltfm_host));

	if (IS_ERR(host)) {
		ret = PTR_ERR(host);
		goto err;
	}

	pltfm_host = sdhci_priv(host);

	host->hw_name = dev_name(&pdev->dev);
	if (pdata && pdata->ops)
		host->ops = pdata->ops;
	else
		host->ops = &sdhci_pltfm_ops;
	if (pdata)
		host->quirks = pdata->quirks;
	host->irq = platform_get_irq(pdev, 0);

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

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

	/*
	 * Some platforms need to probe the controller to be able to
	 * determine which caps should be used.
	 */
	if (host->ops && host->ops->platform_init)
		host->ops->platform_init(host);

	platform_set_drvdata(pdev, host);

	return host;

err_remap:
	release_mem_region(iomem->start, resource_size(iomem));
err_request:
	sdhci_free_host(host);
err:
	dev_err(&pdev->dev, "%s failed %d\n", __func__, ret);
	return ERR_PTR(ret);
}
EXPORT_SYMBOL_GPL(sdhci_pltfm_init);

void sdhci_pltfm_free(struct platform_device *pdev)
{
	struct sdhci_host *host = platform_get_drvdata(pdev);
	struct resource *iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);

	iounmap(host->ioaddr);
	release_mem_region(iomem->start, resource_size(iomem));
	sdhci_free_host(host);
	platform_set_drvdata(pdev, NULL);
}
EXPORT_SYMBOL_GPL(sdhci_pltfm_free);

int sdhci_pltfm_register(struct platform_device *pdev,
			 struct sdhci_pltfm_data *pdata)
{
	struct sdhci_host *host;
	int ret = 0;

	host = sdhci_pltfm_init(pdev, pdata);
	if (IS_ERR(host))
		return PTR_ERR(host);

	sdhci_get_of_property(pdev);

	ret = sdhci_add_host(host);
	if (ret)
		sdhci_pltfm_free(pdev);

	return ret;
}
EXPORT_SYMBOL_GPL(sdhci_pltfm_register);

int sdhci_pltfm_unregister(struct platform_device *pdev)
{
	struct sdhci_host *host = platform_get_drvdata(pdev);
	int dead = (readl(host->ioaddr + SDHCI_INT_STATUS) == 0xffffffff);

	sdhci_remove_host(host, dead);
	sdhci_pltfm_free(pdev);

	return 0;
}
EXPORT_SYMBOL_GPL(sdhci_pltfm_unregister);

#ifdef CONFIG_PM
static int sdhci_pltfm_suspend(struct device *dev)
{
	struct sdhci_host *host = dev_get_drvdata(dev);

	return sdhci_suspend_host(host);
}

static int sdhci_pltfm_resume(struct device *dev)
{
	struct sdhci_host *host = dev_get_drvdata(dev);

	return sdhci_resume_host(host);
}

const struct dev_pm_ops sdhci_pltfm_pmops = {
	.suspend	= sdhci_pltfm_suspend,
	.resume		= sdhci_pltfm_resume,
};
EXPORT_SYMBOL_GPL(sdhci_pltfm_pmops);
#endif	/* CONFIG_PM */

static int __init sdhci_pltfm_drv_init(void)
{
	pr_info("sdhci-pltfm: SDHCI platform and OF driver helper\n");

	return 0;
}
module_init(sdhci_pltfm_drv_init);

static void __exit sdhci_pltfm_drv_exit(void)
{
}
module_exit(sdhci_pltfm_drv_exit);

MODULE_DESCRIPTION("SDHCI platform and OF driver helper");
MODULE_AUTHOR("Intel Corporation");
MODULE_LICENSE("GPL v2");