net: Add a flow_cache_flush_deferred function
[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/module.h>
33 #include <linux/of.h>
34 #ifdef CONFIG_PPC
35 #include <asm/machdep.h>
36 #endif
37 #include "sdhci-pltfm.h"
38
39 static struct sdhci_ops sdhci_pltfm_ops = {
40 };
41
42 #ifdef CONFIG_OF
43 static bool sdhci_of_wp_inverted(struct device_node *np)
44 {
45         if (of_get_property(np, "sdhci,wp-inverted", NULL))
46                 return true;
47
48         /* Old device trees don't have the wp-inverted property. */
49 #ifdef CONFIG_PPC
50         return machine_is(mpc837x_rdb) || machine_is(mpc837x_mds);
51 #else
52         return false;
53 #endif /* CONFIG_PPC */
54 }
55
56 void sdhci_get_of_property(struct platform_device *pdev)
57 {
58         struct device_node *np = pdev->dev.of_node;
59         struct sdhci_host *host = platform_get_drvdata(pdev);
60         struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
61         const __be32 *clk;
62         int size;
63
64         if (of_device_is_available(np)) {
65                 if (of_get_property(np, "sdhci,auto-cmd12", NULL))
66                         host->quirks |= SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12;
67
68                 if (of_get_property(np, "sdhci,1-bit-only", NULL))
69                         host->quirks |= SDHCI_QUIRK_FORCE_1_BIT_DATA;
70
71                 if (sdhci_of_wp_inverted(np))
72                         host->quirks |= SDHCI_QUIRK_INVERTED_WRITE_PROTECT;
73
74                 clk = of_get_property(np, "clock-frequency", &size);
75                 if (clk && size == sizeof(*clk) && *clk)
76                         pltfm_host->clock = be32_to_cpup(clk);
77         }
78 }
79 #else
80 void sdhci_get_of_property(struct platform_device *pdev) {}
81 #endif /* CONFIG_OF */
82 EXPORT_SYMBOL_GPL(sdhci_get_of_property);
83
84 struct sdhci_host *sdhci_pltfm_init(struct platform_device *pdev,
85                                     struct sdhci_pltfm_data *pdata)
86 {
87         struct sdhci_host *host;
88         struct sdhci_pltfm_host *pltfm_host;
89         struct device_node *np = pdev->dev.of_node;
90         struct resource *iomem;
91         int ret;
92
93         iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
94         if (!iomem) {
95                 ret = -ENOMEM;
96                 goto err;
97         }
98
99         if (resource_size(iomem) < 0x100)
100                 dev_err(&pdev->dev, "Invalid iomem size!\n");
101
102         /* Some PCI-based MFD need the parent here */
103         if (pdev->dev.parent != &platform_bus && !np)
104                 host = sdhci_alloc_host(pdev->dev.parent, sizeof(*pltfm_host));
105         else
106                 host = sdhci_alloc_host(&pdev->dev, sizeof(*pltfm_host));
107
108         if (IS_ERR(host)) {
109                 ret = PTR_ERR(host);
110                 goto err;
111         }
112
113         pltfm_host = sdhci_priv(host);
114
115         host->hw_name = dev_name(&pdev->dev);
116         if (pdata && pdata->ops)
117                 host->ops = pdata->ops;
118         else
119                 host->ops = &sdhci_pltfm_ops;
120         if (pdata)
121                 host->quirks = pdata->quirks;
122         host->irq = platform_get_irq(pdev, 0);
123
124         if (!request_mem_region(iomem->start, resource_size(iomem),
125                 mmc_hostname(host->mmc))) {
126                 dev_err(&pdev->dev, "cannot request region\n");
127                 ret = -EBUSY;
128                 goto err_request;
129         }
130
131         host->ioaddr = ioremap(iomem->start, resource_size(iomem));
132         if (!host->ioaddr) {
133                 dev_err(&pdev->dev, "failed to remap registers\n");
134                 ret = -ENOMEM;
135                 goto err_remap;
136         }
137
138         platform_set_drvdata(pdev, host);
139
140         return host;
141
142 err_remap:
143         release_mem_region(iomem->start, resource_size(iomem));
144 err_request:
145         sdhci_free_host(host);
146 err:
147         dev_err(&pdev->dev, "%s failed %d\n", __func__, ret);
148         return ERR_PTR(ret);
149 }
150 EXPORT_SYMBOL_GPL(sdhci_pltfm_init);
151
152 void sdhci_pltfm_free(struct platform_device *pdev)
153 {
154         struct sdhci_host *host = platform_get_drvdata(pdev);
155         struct resource *iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
156
157         iounmap(host->ioaddr);
158         release_mem_region(iomem->start, resource_size(iomem));
159         sdhci_free_host(host);
160         platform_set_drvdata(pdev, NULL);
161 }
162 EXPORT_SYMBOL_GPL(sdhci_pltfm_free);
163
164 int sdhci_pltfm_register(struct platform_device *pdev,
165                          struct sdhci_pltfm_data *pdata)
166 {
167         struct sdhci_host *host;
168         int ret = 0;
169
170         host = sdhci_pltfm_init(pdev, pdata);
171         if (IS_ERR(host))
172                 return PTR_ERR(host);
173
174         sdhci_get_of_property(pdev);
175
176         ret = sdhci_add_host(host);
177         if (ret)
178                 sdhci_pltfm_free(pdev);
179
180         return ret;
181 }
182 EXPORT_SYMBOL_GPL(sdhci_pltfm_register);
183
184 int sdhci_pltfm_unregister(struct platform_device *pdev)
185 {
186         struct sdhci_host *host = platform_get_drvdata(pdev);
187         int dead = (readl(host->ioaddr + SDHCI_INT_STATUS) == 0xffffffff);
188
189         sdhci_remove_host(host, dead);
190         sdhci_pltfm_free(pdev);
191
192         return 0;
193 }
194 EXPORT_SYMBOL_GPL(sdhci_pltfm_unregister);
195
196 #ifdef CONFIG_PM
197 int sdhci_pltfm_suspend(struct platform_device *dev, pm_message_t state)
198 {
199         struct sdhci_host *host = platform_get_drvdata(dev);
200
201         return sdhci_suspend_host(host, state);
202 }
203 EXPORT_SYMBOL_GPL(sdhci_pltfm_suspend);
204
205 int sdhci_pltfm_resume(struct platform_device *dev)
206 {
207         struct sdhci_host *host = platform_get_drvdata(dev);
208
209         return sdhci_resume_host(host);
210 }
211 EXPORT_SYMBOL_GPL(sdhci_pltfm_resume);
212 #endif  /* CONFIG_PM */
213
214 static int __init sdhci_pltfm_drv_init(void)
215 {
216         pr_info("sdhci-pltfm: SDHCI platform and OF driver helper\n");
217
218         return 0;
219 }
220 module_init(sdhci_pltfm_drv_init);
221
222 static void __exit sdhci_pltfm_drv_exit(void)
223 {
224 }
225 module_exit(sdhci_pltfm_drv_exit);
226
227 MODULE_DESCRIPTION("SDHCI platform and OF driver helper");
228 MODULE_AUTHOR("Intel Corporation");
229 MODULE_LICENSE("GPL v2");