mmc: atmel-mci: change namespace
[pandora-kernel.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  * Copyright (c) 2007 Freescale Semiconductor, Inc.
6  * Copyright (c) 2009 MontaVista Software, Inc.
7  *
8  * Authors: Xiaobo Xie <X.Xie@freescale.com>
9  *          Anton Vorontsov <avorontsov@ru.mvista.com>
10  *
11  * This program is free software; you can redistribute it and/or modify
12  * it under the terms of the GNU General Public License version 2 as
13  * published by the Free Software Foundation.
14  *
15  * This program is distributed in the hope that it will be useful,
16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
18  * GNU General Public License for more details.
19  *
20  * You should have received a copy of the GNU General Public License
21  * along with this program; if not, write to the Free Software
22  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
23  */
24
25 /* Supports:
26  * SDHCI platform devices
27  *
28  * Inspired by sdhci-pci.c, by Pierre Ossman
29  */
30
31 #include <linux/err.h>
32 #include <linux/of.h>
33 #ifdef CONFIG_PPC
34 #include <asm/machdep.h>
35 #endif
36 #include "sdhci-pltfm.h"
37
38 static struct sdhci_ops sdhci_pltfm_ops = {
39 };
40
41 #ifdef CONFIG_OF
42 static bool sdhci_of_wp_inverted(struct device_node *np)
43 {
44         if (of_get_property(np, "sdhci,wp-inverted", NULL))
45                 return true;
46
47         /* Old device trees don't have the wp-inverted property. */
48 #ifdef CONFIG_PPC
49         return machine_is(mpc837x_rdb) || machine_is(mpc837x_mds);
50 #else
51         return false;
52 #endif /* CONFIG_PPC */
53 }
54
55 void sdhci_get_of_property(struct platform_device *pdev)
56 {
57         struct device_node *np = pdev->dev.of_node;
58         struct sdhci_host *host = platform_get_drvdata(pdev);
59         struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
60         const __be32 *clk;
61         int size;
62
63         if (of_device_is_available(np)) {
64                 if (of_get_property(np, "sdhci,auto-cmd12", NULL))
65                         host->quirks |= SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12;
66
67                 if (of_get_property(np, "sdhci,1-bit-only", NULL))
68                         host->quirks |= SDHCI_QUIRK_FORCE_1_BIT_DATA;
69
70                 if (sdhci_of_wp_inverted(np))
71                         host->quirks |= SDHCI_QUIRK_INVERTED_WRITE_PROTECT;
72
73                 clk = of_get_property(np, "clock-frequency", &size);
74                 if (clk && size == sizeof(*clk) && *clk)
75                         pltfm_host->clock = be32_to_cpup(clk);
76         }
77 }
78 #else
79 void sdhci_get_of_property(struct platform_device *pdev) {}
80 #endif /* CONFIG_OF */
81 EXPORT_SYMBOL_GPL(sdhci_get_of_property);
82
83 struct sdhci_host *sdhci_pltfm_init(struct platform_device *pdev,
84                                     struct sdhci_pltfm_data *pdata)
85 {
86         struct sdhci_host *host;
87         struct sdhci_pltfm_host *pltfm_host;
88         struct device_node *np = pdev->dev.of_node;
89         struct resource *iomem;
90         int ret;
91
92         iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
93         if (!iomem) {
94                 ret = -ENOMEM;
95                 goto err;
96         }
97
98         if (resource_size(iomem) < 0x100)
99                 dev_err(&pdev->dev, "Invalid iomem size!\n");
100
101         /* Some PCI-based MFD need the parent here */
102         if (pdev->dev.parent != &platform_bus && !np)
103                 host = sdhci_alloc_host(pdev->dev.parent, sizeof(*pltfm_host));
104         else
105                 host = sdhci_alloc_host(&pdev->dev, sizeof(*pltfm_host));
106
107         if (IS_ERR(host)) {
108                 ret = PTR_ERR(host);
109                 goto err;
110         }
111
112         pltfm_host = sdhci_priv(host);
113
114         host->hw_name = dev_name(&pdev->dev);
115         if (pdata && pdata->ops)
116                 host->ops = pdata->ops;
117         else
118                 host->ops = &sdhci_pltfm_ops;
119         if (pdata)
120                 host->quirks = pdata->quirks;
121         host->irq = platform_get_irq(pdev, 0);
122
123         if (!request_mem_region(iomem->start, resource_size(iomem),
124                 mmc_hostname(host->mmc))) {
125                 dev_err(&pdev->dev, "cannot request region\n");
126                 ret = -EBUSY;
127                 goto err_request;
128         }
129
130         host->ioaddr = ioremap(iomem->start, resource_size(iomem));
131         if (!host->ioaddr) {
132                 dev_err(&pdev->dev, "failed to remap registers\n");
133                 ret = -ENOMEM;
134                 goto err_remap;
135         }
136
137         platform_set_drvdata(pdev, host);
138
139         return host;
140
141 err_remap:
142         release_mem_region(iomem->start, resource_size(iomem));
143 err_request:
144         sdhci_free_host(host);
145 err:
146         dev_err(&pdev->dev, "%s failed %d\n", __func__, ret);
147         return ERR_PTR(ret);
148 }
149 EXPORT_SYMBOL_GPL(sdhci_pltfm_init);
150
151 void sdhci_pltfm_free(struct platform_device *pdev)
152 {
153         struct sdhci_host *host = platform_get_drvdata(pdev);
154         struct resource *iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
155
156         iounmap(host->ioaddr);
157         release_mem_region(iomem->start, resource_size(iomem));
158         sdhci_free_host(host);
159         platform_set_drvdata(pdev, NULL);
160 }
161 EXPORT_SYMBOL_GPL(sdhci_pltfm_free);
162
163 int sdhci_pltfm_register(struct platform_device *pdev,
164                          struct sdhci_pltfm_data *pdata)
165 {
166         struct sdhci_host *host;
167         int ret = 0;
168
169         host = sdhci_pltfm_init(pdev, pdata);
170         if (IS_ERR(host))
171                 return PTR_ERR(host);
172
173         sdhci_get_of_property(pdev);
174
175         ret = sdhci_add_host(host);
176         if (ret)
177                 sdhci_pltfm_free(pdev);
178
179         return ret;
180 }
181 EXPORT_SYMBOL_GPL(sdhci_pltfm_register);
182
183 int sdhci_pltfm_unregister(struct platform_device *pdev)
184 {
185         struct sdhci_host *host = platform_get_drvdata(pdev);
186         int dead = (readl(host->ioaddr + SDHCI_INT_STATUS) == 0xffffffff);
187
188         sdhci_remove_host(host, dead);
189         sdhci_pltfm_free(pdev);
190
191         return 0;
192 }
193 EXPORT_SYMBOL_GPL(sdhci_pltfm_unregister);
194
195 #ifdef CONFIG_PM
196 int sdhci_pltfm_suspend(struct platform_device *dev, pm_message_t state)
197 {
198         struct sdhci_host *host = platform_get_drvdata(dev);
199
200         return sdhci_suspend_host(host, state);
201 }
202 EXPORT_SYMBOL_GPL(sdhci_pltfm_suspend);
203
204 int sdhci_pltfm_resume(struct platform_device *dev)
205 {
206         struct sdhci_host *host = platform_get_drvdata(dev);
207
208         return sdhci_resume_host(host);
209 }
210 EXPORT_SYMBOL_GPL(sdhci_pltfm_resume);
211 #endif  /* CONFIG_PM */
212
213 static int __init sdhci_pltfm_drv_init(void)
214 {
215         pr_info("sdhci-pltfm: SDHCI platform and OF driver helper\n");
216
217         return 0;
218 }
219 module_init(sdhci_pltfm_drv_init);
220
221 static void __exit sdhci_pltfm_drv_exit(void)
222 {
223 }
224 module_exit(sdhci_pltfm_drv_exit);
225
226 MODULE_DESCRIPTION("SDHCI platform and OF driver helper");
227 MODULE_AUTHOR("Intel Corporation");
228 MODULE_LICENSE("GPL v2");