ext4: fix undefined behavior in ext4_fill_flex_info()
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / mmc / host / sdhci-pltfm.c
blob297f40ae6ad5623f2695c16c4a5db4886931b791
1 /*
2 * sdhci-pltfm.c Support for SDHCI platform devices
3 * Copyright (c) 2009 Intel Corporation
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
19 /* Supports:
20 * SDHCI platform devices
22 * Inspired by sdhci-pci.c, by Pierre Ossman
25 #include <linux/delay.h>
26 #include <linux/highmem.h>
27 #include <linux/platform_device.h>
29 #include <linux/mmc/host.h>
31 #include <linux/io.h>
33 #include "sdhci.h"
35 /*****************************************************************************\
36 * *
37 * SDHCI core callbacks *
38 * *
39 \*****************************************************************************/
41 static struct sdhci_ops sdhci_pltfm_ops = {
44 /*****************************************************************************\
45 * *
46 * Device probing/removal *
47 * *
48 \*****************************************************************************/
50 static int __devinit sdhci_pltfm_probe(struct platform_device *pdev)
52 struct sdhci_host *host;
53 struct resource *iomem;
54 int ret;
56 BUG_ON(pdev == NULL);
58 iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
59 if (!iomem) {
60 ret = -ENOMEM;
61 goto err;
64 if (resource_size(iomem) != 0x100)
65 dev_err(&pdev->dev, "Invalid iomem size. You may "
66 "experience problems.\n");
68 if (pdev->dev.parent)
69 host = sdhci_alloc_host(pdev->dev.parent, 0);
70 else
71 host = sdhci_alloc_host(&pdev->dev, 0);
73 if (IS_ERR(host)) {
74 ret = PTR_ERR(host);
75 goto err;
78 host->hw_name = "platform";
79 host->ops = &sdhci_pltfm_ops;
80 host->irq = platform_get_irq(pdev, 0);
82 if (!request_mem_region(iomem->start, resource_size(iomem),
83 mmc_hostname(host->mmc))) {
84 dev_err(&pdev->dev, "cannot request region\n");
85 ret = -EBUSY;
86 goto err_request;
89 host->ioaddr = ioremap(iomem->start, resource_size(iomem));
90 if (!host->ioaddr) {
91 dev_err(&pdev->dev, "failed to remap registers\n");
92 ret = -ENOMEM;
93 goto err_remap;
96 ret = sdhci_add_host(host);
97 if (ret)
98 goto err_add_host;
100 platform_set_drvdata(pdev, host);
102 return 0;
104 err_add_host:
105 iounmap(host->ioaddr);
106 err_remap:
107 release_mem_region(iomem->start, resource_size(iomem));
108 err_request:
109 sdhci_free_host(host);
110 err:
111 printk(KERN_ERR"Probing of sdhci-pltfm failed: %d\n", ret);
112 return ret;
115 static int __devexit sdhci_pltfm_remove(struct platform_device *pdev)
117 struct sdhci_host *host = platform_get_drvdata(pdev);
118 struct resource *iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
119 int dead;
120 u32 scratch;
122 dead = 0;
123 scratch = readl(host->ioaddr + SDHCI_INT_STATUS);
124 if (scratch == (u32)-1)
125 dead = 1;
127 sdhci_remove_host(host, dead);
128 iounmap(host->ioaddr);
129 release_mem_region(iomem->start, resource_size(iomem));
130 sdhci_free_host(host);
131 platform_set_drvdata(pdev, NULL);
133 return 0;
136 static struct platform_driver sdhci_pltfm_driver = {
137 .driver = {
138 .name = "sdhci",
139 .owner = THIS_MODULE,
141 .probe = sdhci_pltfm_probe,
142 .remove = __devexit_p(sdhci_pltfm_remove),
145 /*****************************************************************************\
147 * Driver init/exit *
149 \*****************************************************************************/
151 static int __init sdhci_drv_init(void)
153 return platform_driver_register(&sdhci_pltfm_driver);
156 static void __exit sdhci_drv_exit(void)
158 platform_driver_unregister(&sdhci_pltfm_driver);
161 module_init(sdhci_drv_init);
162 module_exit(sdhci_drv_exit);
164 MODULE_DESCRIPTION("Secure Digital Host Controller Interface platform driver");
165 MODULE_AUTHOR("Mocean Laboratories <info@mocean-labs.com>");
166 MODULE_LICENSE("GPL v2");
167 MODULE_ALIAS("platform:sdhci");