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mmc: sdhci-pltfm: add suspend/resume functions
[~shefty/rdma-dev.git] / drivers / mmc / host / sdhci-pltfm.c
1 /*
2  * sdhci-pltfm.c Support for SDHCI platform devices
3  * Copyright (c) 2009 Intel Corporation
4  *
5  * This program is free software; you can redistribute it and/or modify
6  * it under the terms of the GNU General Public License version 2 as
7  * published by the Free Software Foundation.
8  *
9  * This program is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12  * GNU General Public License for more details.
13  *
14  * You should have received a copy of the GNU General Public License
15  * along with this program; if not, write to the Free Software
16  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
17  */
18
19 /* Supports:
20  * SDHCI platform devices
21  *
22  * Inspired by sdhci-pci.c, by Pierre Ossman
23  */
24
25 #include <linux/delay.h>
26 #include <linux/highmem.h>
27 #include <linux/mod_devicetable.h>
28 #include <linux/platform_device.h>
29
30 #include <linux/mmc/host.h>
31
32 #include <linux/io.h>
33 #include <linux/sdhci-pltfm.h>
34
35 #include "sdhci.h"
36 #include "sdhci-pltfm.h"
37
38 /*****************************************************************************\
39  *                                                                           *
40  * SDHCI core callbacks                                                      *
41  *                                                                           *
42 \*****************************************************************************/
43
44 static struct sdhci_ops sdhci_pltfm_ops = {
45 };
46
47 /*****************************************************************************\
48  *                                                                           *
49  * Device probing/removal                                                    *
50  *                                                                           *
51 \*****************************************************************************/
52
53 static int __devinit sdhci_pltfm_probe(struct platform_device *pdev)
54 {
55         struct sdhci_pltfm_data *pdata = pdev->dev.platform_data;
56         const struct platform_device_id *platid = platform_get_device_id(pdev);
57         struct sdhci_host *host;
58         struct resource *iomem;
59         int ret;
60
61         if (!pdata && platid && platid->driver_data)
62                 pdata = (void *)platid->driver_data;
63
64         iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
65         if (!iomem) {
66                 ret = -ENOMEM;
67                 goto err;
68         }
69
70         if (resource_size(iomem) < 0x100)
71                 dev_err(&pdev->dev, "Invalid iomem size. You may "
72                         "experience problems.\n");
73
74         if (pdev->dev.parent)
75                 host = sdhci_alloc_host(pdev->dev.parent, 0);
76         else
77                 host = sdhci_alloc_host(&pdev->dev, 0);
78
79         if (IS_ERR(host)) {
80                 ret = PTR_ERR(host);
81                 goto err;
82         }
83
84         host->hw_name = "platform";
85         if (pdata && pdata->ops)
86                 host->ops = pdata->ops;
87         else
88                 host->ops = &sdhci_pltfm_ops;
89         if (pdata)
90                 host->quirks = pdata->quirks;
91         host->irq = platform_get_irq(pdev, 0);
92
93         if (!request_mem_region(iomem->start, resource_size(iomem),
94                 mmc_hostname(host->mmc))) {
95                 dev_err(&pdev->dev, "cannot request region\n");
96                 ret = -EBUSY;
97                 goto err_request;
98         }
99
100         host->ioaddr = ioremap(iomem->start, resource_size(iomem));
101         if (!host->ioaddr) {
102                 dev_err(&pdev->dev, "failed to remap registers\n");
103                 ret = -ENOMEM;
104                 goto err_remap;
105         }
106
107         if (pdata && pdata->init) {
108                 ret = pdata->init(host);
109                 if (ret)
110                         goto err_plat_init;
111         }
112
113         ret = sdhci_add_host(host);
114         if (ret)
115                 goto err_add_host;
116
117         platform_set_drvdata(pdev, host);
118
119         return 0;
120
121 err_add_host:
122         if (pdata && pdata->exit)
123                 pdata->exit(host);
124 err_plat_init:
125         iounmap(host->ioaddr);
126 err_remap:
127         release_mem_region(iomem->start, resource_size(iomem));
128 err_request:
129         sdhci_free_host(host);
130 err:
131         printk(KERN_ERR"Probing of sdhci-pltfm failed: %d\n", ret);
132         return ret;
133 }
134
135 static int __devexit sdhci_pltfm_remove(struct platform_device *pdev)
136 {
137         struct sdhci_pltfm_data *pdata = pdev->dev.platform_data;
138         struct sdhci_host *host = platform_get_drvdata(pdev);
139         struct resource *iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
140         int dead;
141         u32 scratch;
142
143         dead = 0;
144         scratch = readl(host->ioaddr + SDHCI_INT_STATUS);
145         if (scratch == (u32)-1)
146                 dead = 1;
147
148         sdhci_remove_host(host, dead);
149         if (pdata && pdata->exit)
150                 pdata->exit(host);
151         iounmap(host->ioaddr);
152         release_mem_region(iomem->start, resource_size(iomem));
153         sdhci_free_host(host);
154         platform_set_drvdata(pdev, NULL);
155
156         return 0;
157 }
158
159 static const struct platform_device_id sdhci_pltfm_ids[] = {
160         { "sdhci", },
161 #ifdef CONFIG_MMC_SDHCI_CNS3XXX
162         { "sdhci-cns3xxx", (kernel_ulong_t)&sdhci_cns3xxx_pdata },
163 #endif
164         { },
165 };
166 MODULE_DEVICE_TABLE(platform, sdhci_pltfm_ids);
167
168 #ifdef CONFIG_PM
169 static int sdhci_pltfm_suspend(struct platform_device *dev, pm_message_t state)
170 {
171         struct sdhci_host *host = platform_get_drvdata(dev);
172
173         return sdhci_suspend_host(host, state);
174 }
175
176 static int sdhci_pltfm_resume(struct platform_device *dev)
177 {
178         struct sdhci_host *host = platform_get_drvdata(dev);
179
180         return sdhci_resume_host(host);
181 }
182 #else
183 #define sdhci_pltfm_suspend     NULL
184 #define sdhci_pltfm_resume      NULL
185 #endif  /* CONFIG_PM */
186
187 static struct platform_driver sdhci_pltfm_driver = {
188         .driver = {
189                 .name   = "sdhci",
190                 .owner  = THIS_MODULE,
191         },
192         .probe          = sdhci_pltfm_probe,
193         .remove         = __devexit_p(sdhci_pltfm_remove),
194         .id_table       = sdhci_pltfm_ids,
195         .suspend        = sdhci_pltfm_suspend,
196         .resume         = sdhci_pltfm_resume,
197 };
198
199 /*****************************************************************************\
200  *                                                                           *
201  * Driver init/exit                                                          *
202  *                                                                           *
203 \*****************************************************************************/
204
205 static int __init sdhci_drv_init(void)
206 {
207         return platform_driver_register(&sdhci_pltfm_driver);
208 }
209
210 static void __exit sdhci_drv_exit(void)
211 {
212         platform_driver_unregister(&sdhci_pltfm_driver);
213 }
214
215 module_init(sdhci_drv_init);
216 module_exit(sdhci_drv_exit);
217
218 MODULE_DESCRIPTION("Secure Digital Host Controller Interface platform driver");
219 MODULE_AUTHOR("Mocean Laboratories <info@mocean-labs.com>");
220 MODULE_LICENSE("GPL v2");