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mmc: sdhci-pltfm: Support optional pm properties
[~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  * Copyright (c) 2007, 2011 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             of_get_property(np, "wp-inverted", NULL))
47                 return true;
48
49         /* Old device trees don't have the wp-inverted property. */
50 #ifdef CONFIG_PPC
51         return machine_is(mpc837x_rdb) || machine_is(mpc837x_mds);
52 #else
53         return false;
54 #endif /* CONFIG_PPC */
55 }
56
57 void sdhci_get_of_property(struct platform_device *pdev)
58 {
59         struct device_node *np = pdev->dev.of_node;
60         struct sdhci_host *host = platform_get_drvdata(pdev);
61         struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
62         const __be32 *clk;
63         u32 bus_width;
64         int size;
65
66         if (of_device_is_available(np)) {
67                 if (of_get_property(np, "sdhci,auto-cmd12", NULL))
68                         host->quirks |= SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12;
69
70                 if (of_get_property(np, "sdhci,1-bit-only", NULL) ||
71                     (of_property_read_u32(np, "bus-width", &bus_width) == 0 &&
72                     bus_width == 1))
73                         host->quirks |= SDHCI_QUIRK_FORCE_1_BIT_DATA;
74
75                 if (sdhci_of_wp_inverted(np))
76                         host->quirks |= SDHCI_QUIRK_INVERTED_WRITE_PROTECT;
77
78                 if (of_get_property(np, "broken-cd", NULL))
79                         host->quirks |= SDHCI_QUIRK_BROKEN_CARD_DETECTION;
80
81                 if (of_device_is_compatible(np, "fsl,p2020-rev1-esdhc"))
82                         host->quirks |= SDHCI_QUIRK_BROKEN_DMA;
83
84                 if (of_device_is_compatible(np, "fsl,p2020-esdhc") ||
85                     of_device_is_compatible(np, "fsl,p1010-esdhc") ||
86                     of_device_is_compatible(np, "fsl,mpc8536-esdhc"))
87                         host->quirks |= SDHCI_QUIRK_BROKEN_TIMEOUT_VAL;
88
89                 clk = of_get_property(np, "clock-frequency", &size);
90                 if (clk && size == sizeof(*clk) && *clk)
91                         pltfm_host->clock = be32_to_cpup(clk);
92
93                 if (of_find_property(np, "keep-power-in-suspend", NULL))
94                         host->mmc->pm_caps |= MMC_PM_KEEP_POWER;
95
96                 if (of_find_property(np, "enable-sdio-wakeup", NULL))
97                         host->mmc->pm_caps |= MMC_PM_WAKE_SDIO_IRQ;
98         }
99 }
100 #else
101 void sdhci_get_of_property(struct platform_device *pdev) {}
102 #endif /* CONFIG_OF */
103 EXPORT_SYMBOL_GPL(sdhci_get_of_property);
104
105 struct sdhci_host *sdhci_pltfm_init(struct platform_device *pdev,
106                                     struct sdhci_pltfm_data *pdata)
107 {
108         struct sdhci_host *host;
109         struct sdhci_pltfm_host *pltfm_host;
110         struct device_node *np = pdev->dev.of_node;
111         struct resource *iomem;
112         int ret;
113
114         iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
115         if (!iomem) {
116                 ret = -ENOMEM;
117                 goto err;
118         }
119
120         if (resource_size(iomem) < 0x100)
121                 dev_err(&pdev->dev, "Invalid iomem size!\n");
122
123         /* Some PCI-based MFD need the parent here */
124         if (pdev->dev.parent != &platform_bus && !np)
125                 host = sdhci_alloc_host(pdev->dev.parent, sizeof(*pltfm_host));
126         else
127                 host = sdhci_alloc_host(&pdev->dev, sizeof(*pltfm_host));
128
129         if (IS_ERR(host)) {
130                 ret = PTR_ERR(host);
131                 goto err;
132         }
133
134         pltfm_host = sdhci_priv(host);
135
136         host->hw_name = dev_name(&pdev->dev);
137         if (pdata && pdata->ops)
138                 host->ops = pdata->ops;
139         else
140                 host->ops = &sdhci_pltfm_ops;
141         if (pdata)
142                 host->quirks = pdata->quirks;
143         host->irq = platform_get_irq(pdev, 0);
144
145         if (!request_mem_region(iomem->start, resource_size(iomem),
146                 mmc_hostname(host->mmc))) {
147                 dev_err(&pdev->dev, "cannot request region\n");
148                 ret = -EBUSY;
149                 goto err_request;
150         }
151
152         host->ioaddr = ioremap(iomem->start, resource_size(iomem));
153         if (!host->ioaddr) {
154                 dev_err(&pdev->dev, "failed to remap registers\n");
155                 ret = -ENOMEM;
156                 goto err_remap;
157         }
158
159         /*
160          * Some platforms need to probe the controller to be able to
161          * determine which caps should be used.
162          */
163         if (host->ops && host->ops->platform_init)
164                 host->ops->platform_init(host);
165
166         platform_set_drvdata(pdev, host);
167
168         return host;
169
170 err_remap:
171         release_mem_region(iomem->start, resource_size(iomem));
172 err_request:
173         sdhci_free_host(host);
174 err:
175         dev_err(&pdev->dev, "%s failed %d\n", __func__, ret);
176         return ERR_PTR(ret);
177 }
178 EXPORT_SYMBOL_GPL(sdhci_pltfm_init);
179
180 void sdhci_pltfm_free(struct platform_device *pdev)
181 {
182         struct sdhci_host *host = platform_get_drvdata(pdev);
183         struct resource *iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
184
185         iounmap(host->ioaddr);
186         release_mem_region(iomem->start, resource_size(iomem));
187         sdhci_free_host(host);
188         platform_set_drvdata(pdev, NULL);
189 }
190 EXPORT_SYMBOL_GPL(sdhci_pltfm_free);
191
192 int sdhci_pltfm_register(struct platform_device *pdev,
193                          struct sdhci_pltfm_data *pdata)
194 {
195         struct sdhci_host *host;
196         int ret = 0;
197
198         host = sdhci_pltfm_init(pdev, pdata);
199         if (IS_ERR(host))
200                 return PTR_ERR(host);
201
202         sdhci_get_of_property(pdev);
203
204         ret = sdhci_add_host(host);
205         if (ret)
206                 sdhci_pltfm_free(pdev);
207
208         return ret;
209 }
210 EXPORT_SYMBOL_GPL(sdhci_pltfm_register);
211
212 int sdhci_pltfm_unregister(struct platform_device *pdev)
213 {
214         struct sdhci_host *host = platform_get_drvdata(pdev);
215         int dead = (readl(host->ioaddr + SDHCI_INT_STATUS) == 0xffffffff);
216
217         sdhci_remove_host(host, dead);
218         sdhci_pltfm_free(pdev);
219
220         return 0;
221 }
222 EXPORT_SYMBOL_GPL(sdhci_pltfm_unregister);
223
224 #ifdef CONFIG_PM
225 static int sdhci_pltfm_suspend(struct device *dev)
226 {
227         struct sdhci_host *host = dev_get_drvdata(dev);
228
229         return sdhci_suspend_host(host);
230 }
231
232 static int sdhci_pltfm_resume(struct device *dev)
233 {
234         struct sdhci_host *host = dev_get_drvdata(dev);
235
236         return sdhci_resume_host(host);
237 }
238
239 const struct dev_pm_ops sdhci_pltfm_pmops = {
240         .suspend        = sdhci_pltfm_suspend,
241         .resume         = sdhci_pltfm_resume,
242 };
243 EXPORT_SYMBOL_GPL(sdhci_pltfm_pmops);
244 #endif  /* CONFIG_PM */
245
246 static int __init sdhci_pltfm_drv_init(void)
247 {
248         pr_info("sdhci-pltfm: SDHCI platform and OF driver helper\n");
249
250         return 0;
251 }
252 module_init(sdhci_pltfm_drv_init);
253
254 static void __exit sdhci_pltfm_drv_exit(void)
255 {
256 }
257 module_exit(sdhci_pltfm_drv_exit);
258
259 MODULE_DESCRIPTION("SDHCI platform and OF driver helper");
260 MODULE_AUTHOR("Intel Corporation");
261 MODULE_LICENSE("GPL v2");