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mmc: dt: add no-1-8-v device tree flag
[~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_get_property(np, "no-1-8-v", NULL))
82                         host->quirks2 |= SDHCI_QUIRK2_NO_1_8_V;
83
84                 if (of_device_is_compatible(np, "fsl,p2020-rev1-esdhc"))
85                         host->quirks |= SDHCI_QUIRK_BROKEN_DMA;
86
87                 if (of_device_is_compatible(np, "fsl,p2020-esdhc") ||
88                     of_device_is_compatible(np, "fsl,p1010-esdhc") ||
89                     of_device_is_compatible(np, "fsl,mpc8536-esdhc"))
90                         host->quirks |= SDHCI_QUIRK_BROKEN_TIMEOUT_VAL;
91
92                 clk = of_get_property(np, "clock-frequency", &size);
93                 if (clk && size == sizeof(*clk) && *clk)
94                         pltfm_host->clock = be32_to_cpup(clk);
95
96                 if (of_find_property(np, "keep-power-in-suspend", NULL))
97                         host->mmc->pm_caps |= MMC_PM_KEEP_POWER;
98
99                 if (of_find_property(np, "enable-sdio-wakeup", NULL))
100                         host->mmc->pm_caps |= MMC_PM_WAKE_SDIO_IRQ;
101         }
102 }
103 #else
104 void sdhci_get_of_property(struct platform_device *pdev) {}
105 #endif /* CONFIG_OF */
106 EXPORT_SYMBOL_GPL(sdhci_get_of_property);
107
108 struct sdhci_host *sdhci_pltfm_init(struct platform_device *pdev,
109                                     struct sdhci_pltfm_data *pdata)
110 {
111         struct sdhci_host *host;
112         struct sdhci_pltfm_host *pltfm_host;
113         struct device_node *np = pdev->dev.of_node;
114         struct resource *iomem;
115         int ret;
116
117         iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
118         if (!iomem) {
119                 ret = -ENOMEM;
120                 goto err;
121         }
122
123         if (resource_size(iomem) < 0x100)
124                 dev_err(&pdev->dev, "Invalid iomem size!\n");
125
126         /* Some PCI-based MFD need the parent here */
127         if (pdev->dev.parent != &platform_bus && !np)
128                 host = sdhci_alloc_host(pdev->dev.parent, sizeof(*pltfm_host));
129         else
130                 host = sdhci_alloc_host(&pdev->dev, sizeof(*pltfm_host));
131
132         if (IS_ERR(host)) {
133                 ret = PTR_ERR(host);
134                 goto err;
135         }
136
137         pltfm_host = sdhci_priv(host);
138
139         host->hw_name = dev_name(&pdev->dev);
140         if (pdata && pdata->ops)
141                 host->ops = pdata->ops;
142         else
143                 host->ops = &sdhci_pltfm_ops;
144         if (pdata)
145                 host->quirks = pdata->quirks;
146         host->irq = platform_get_irq(pdev, 0);
147
148         if (!request_mem_region(iomem->start, resource_size(iomem),
149                 mmc_hostname(host->mmc))) {
150                 dev_err(&pdev->dev, "cannot request region\n");
151                 ret = -EBUSY;
152                 goto err_request;
153         }
154
155         host->ioaddr = ioremap(iomem->start, resource_size(iomem));
156         if (!host->ioaddr) {
157                 dev_err(&pdev->dev, "failed to remap registers\n");
158                 ret = -ENOMEM;
159                 goto err_remap;
160         }
161
162         /*
163          * Some platforms need to probe the controller to be able to
164          * determine which caps should be used.
165          */
166         if (host->ops && host->ops->platform_init)
167                 host->ops->platform_init(host);
168
169         platform_set_drvdata(pdev, host);
170
171         return host;
172
173 err_remap:
174         release_mem_region(iomem->start, resource_size(iomem));
175 err_request:
176         sdhci_free_host(host);
177 err:
178         dev_err(&pdev->dev, "%s failed %d\n", __func__, ret);
179         return ERR_PTR(ret);
180 }
181 EXPORT_SYMBOL_GPL(sdhci_pltfm_init);
182
183 void sdhci_pltfm_free(struct platform_device *pdev)
184 {
185         struct sdhci_host *host = platform_get_drvdata(pdev);
186         struct resource *iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
187
188         iounmap(host->ioaddr);
189         release_mem_region(iomem->start, resource_size(iomem));
190         sdhci_free_host(host);
191         platform_set_drvdata(pdev, NULL);
192 }
193 EXPORT_SYMBOL_GPL(sdhci_pltfm_free);
194
195 int sdhci_pltfm_register(struct platform_device *pdev,
196                          struct sdhci_pltfm_data *pdata)
197 {
198         struct sdhci_host *host;
199         int ret = 0;
200
201         host = sdhci_pltfm_init(pdev, pdata);
202         if (IS_ERR(host))
203                 return PTR_ERR(host);
204
205         sdhci_get_of_property(pdev);
206
207         ret = sdhci_add_host(host);
208         if (ret)
209                 sdhci_pltfm_free(pdev);
210
211         return ret;
212 }
213 EXPORT_SYMBOL_GPL(sdhci_pltfm_register);
214
215 int sdhci_pltfm_unregister(struct platform_device *pdev)
216 {
217         struct sdhci_host *host = platform_get_drvdata(pdev);
218         int dead = (readl(host->ioaddr + SDHCI_INT_STATUS) == 0xffffffff);
219
220         sdhci_remove_host(host, dead);
221         sdhci_pltfm_free(pdev);
222
223         return 0;
224 }
225 EXPORT_SYMBOL_GPL(sdhci_pltfm_unregister);
226
227 #ifdef CONFIG_PM
228 static int sdhci_pltfm_suspend(struct device *dev)
229 {
230         struct sdhci_host *host = dev_get_drvdata(dev);
231
232         return sdhci_suspend_host(host);
233 }
234
235 static int sdhci_pltfm_resume(struct device *dev)
236 {
237         struct sdhci_host *host = dev_get_drvdata(dev);
238
239         return sdhci_resume_host(host);
240 }
241
242 const struct dev_pm_ops sdhci_pltfm_pmops = {
243         .suspend        = sdhci_pltfm_suspend,
244         .resume         = sdhci_pltfm_resume,
245 };
246 EXPORT_SYMBOL_GPL(sdhci_pltfm_pmops);
247 #endif  /* CONFIG_PM */
248
249 static int __init sdhci_pltfm_drv_init(void)
250 {
251         pr_info("sdhci-pltfm: SDHCI platform and OF driver helper\n");
252
253         return 0;
254 }
255 module_init(sdhci_pltfm_drv_init);
256
257 static void __exit sdhci_pltfm_drv_exit(void)
258 {
259 }
260 module_exit(sdhci_pltfm_drv_exit);
261
262 MODULE_DESCRIPTION("SDHCI platform and OF driver helper");
263 MODULE_AUTHOR("Intel Corporation");
264 MODULE_LICENSE("GPL v2");