cgroup: superblock can't be released with active dentries
[firefly-linux-kernel-4.4.55.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                 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                 if (of_device_is_compatible(np, "fsl,p2020-rev1-esdhc"))
75                         host->quirks |= SDHCI_QUIRK_BROKEN_DMA;
76
77                 if (of_device_is_compatible(np, "fsl,p2020-esdhc") ||
78                     of_device_is_compatible(np, "fsl,p1010-esdhc") ||
79                     of_device_is_compatible(np, "fsl,mpc8536-esdhc"))
80                         host->quirks |= SDHCI_QUIRK_BROKEN_TIMEOUT_VAL;
81
82                 clk = of_get_property(np, "clock-frequency", &size);
83                 if (clk && size == sizeof(*clk) && *clk)
84                         pltfm_host->clock = be32_to_cpup(clk);
85         }
86 }
87 #else
88 void sdhci_get_of_property(struct platform_device *pdev) {}
89 #endif /* CONFIG_OF */
90 EXPORT_SYMBOL_GPL(sdhci_get_of_property);
91
92 struct sdhci_host *sdhci_pltfm_init(struct platform_device *pdev,
93                                     struct sdhci_pltfm_data *pdata)
94 {
95         struct sdhci_host *host;
96         struct sdhci_pltfm_host *pltfm_host;
97         struct device_node *np = pdev->dev.of_node;
98         struct resource *iomem;
99         int ret;
100
101         iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
102         if (!iomem) {
103                 ret = -ENOMEM;
104                 goto err;
105         }
106
107         if (resource_size(iomem) < 0x100)
108                 dev_err(&pdev->dev, "Invalid iomem size!\n");
109
110         /* Some PCI-based MFD need the parent here */
111         if (pdev->dev.parent != &platform_bus && !np)
112                 host = sdhci_alloc_host(pdev->dev.parent, sizeof(*pltfm_host));
113         else
114                 host = sdhci_alloc_host(&pdev->dev, sizeof(*pltfm_host));
115
116         if (IS_ERR(host)) {
117                 ret = PTR_ERR(host);
118                 goto err;
119         }
120
121         pltfm_host = sdhci_priv(host);
122
123         host->hw_name = dev_name(&pdev->dev);
124         if (pdata && pdata->ops)
125                 host->ops = pdata->ops;
126         else
127                 host->ops = &sdhci_pltfm_ops;
128         if (pdata)
129                 host->quirks = pdata->quirks;
130         host->irq = platform_get_irq(pdev, 0);
131
132         if (!request_mem_region(iomem->start, resource_size(iomem),
133                 mmc_hostname(host->mmc))) {
134                 dev_err(&pdev->dev, "cannot request region\n");
135                 ret = -EBUSY;
136                 goto err_request;
137         }
138
139         host->ioaddr = ioremap(iomem->start, resource_size(iomem));
140         if (!host->ioaddr) {
141                 dev_err(&pdev->dev, "failed to remap registers\n");
142                 ret = -ENOMEM;
143                 goto err_remap;
144         }
145
146         platform_set_drvdata(pdev, host);
147
148         return host;
149
150 err_remap:
151         release_mem_region(iomem->start, resource_size(iomem));
152 err_request:
153         sdhci_free_host(host);
154 err:
155         dev_err(&pdev->dev, "%s failed %d\n", __func__, ret);
156         return ERR_PTR(ret);
157 }
158 EXPORT_SYMBOL_GPL(sdhci_pltfm_init);
159
160 void sdhci_pltfm_free(struct platform_device *pdev)
161 {
162         struct sdhci_host *host = platform_get_drvdata(pdev);
163         struct resource *iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
164
165         iounmap(host->ioaddr);
166         release_mem_region(iomem->start, resource_size(iomem));
167         sdhci_free_host(host);
168         platform_set_drvdata(pdev, NULL);
169 }
170 EXPORT_SYMBOL_GPL(sdhci_pltfm_free);
171
172 int sdhci_pltfm_register(struct platform_device *pdev,
173                          struct sdhci_pltfm_data *pdata)
174 {
175         struct sdhci_host *host;
176         int ret = 0;
177
178         host = sdhci_pltfm_init(pdev, pdata);
179         if (IS_ERR(host))
180                 return PTR_ERR(host);
181
182         sdhci_get_of_property(pdev);
183
184         ret = sdhci_add_host(host);
185         if (ret)
186                 sdhci_pltfm_free(pdev);
187
188         return ret;
189 }
190 EXPORT_SYMBOL_GPL(sdhci_pltfm_register);
191
192 int sdhci_pltfm_unregister(struct platform_device *pdev)
193 {
194         struct sdhci_host *host = platform_get_drvdata(pdev);
195         int dead = (readl(host->ioaddr + SDHCI_INT_STATUS) == 0xffffffff);
196
197         sdhci_remove_host(host, dead);
198         sdhci_pltfm_free(pdev);
199
200         return 0;
201 }
202 EXPORT_SYMBOL_GPL(sdhci_pltfm_unregister);
203
204 #ifdef CONFIG_PM
205 static int sdhci_pltfm_suspend(struct device *dev)
206 {
207         struct sdhci_host *host = dev_get_drvdata(dev);
208
209         return sdhci_suspend_host(host);
210 }
211
212 static int sdhci_pltfm_resume(struct device *dev)
213 {
214         struct sdhci_host *host = dev_get_drvdata(dev);
215
216         return sdhci_resume_host(host);
217 }
218
219 const struct dev_pm_ops sdhci_pltfm_pmops = {
220         .suspend        = sdhci_pltfm_suspend,
221         .resume         = sdhci_pltfm_resume,
222 };
223 EXPORT_SYMBOL_GPL(sdhci_pltfm_pmops);
224 #endif  /* CONFIG_PM */
225
226 static int __init sdhci_pltfm_drv_init(void)
227 {
228         pr_info("sdhci-pltfm: SDHCI platform and OF driver helper\n");
229
230         return 0;
231 }
232 module_init(sdhci_pltfm_drv_init);
233
234 static void __exit sdhci_pltfm_drv_exit(void)
235 {
236 }
237 module_exit(sdhci_pltfm_drv_exit);
238
239 MODULE_DESCRIPTION("SDHCI platform and OF driver helper");
240 MODULE_AUTHOR("Intel Corporation");
241 MODULE_LICENSE("GPL v2");