drivers/mmc/host/sdhci-pltfm.c

   1 /*
   2  * sdhci-pltfm.c Support for SDHCI platform devices
   3  * Copyright (c) 2009 Intel Corporation
   4  *
   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.
   8  *
   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.
  13  *
  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.
  17  */
  18
  19 /* Supports:
  20  * SDHCI platform devices
  21  *
  22  * Inspired by sdhci-pci.c, by Pierre Ossman
  23  */
  24
  25 #include <linux/delay.h>
  26 #include <linux/highmem.h>
  27 #include <linux/platform_device.h>
  28
  29 #include <linux/mmc/host.h>
  30
  31 #include <linux/io.h>
  32
  33 #include "sdhci.h"
  34
  35 /*****************************************************************************\
  36  *                                                                           *
  37  * SDHCI core callbacks                                                      *
  38  *                                                                           *
  39 \*****************************************************************************/
  40
  41 static struct sdhci_ops sdhci_pltfm_ops = {
  42 };
  43
  44 /*****************************************************************************\
  45  *                                                                           *
  46  * Device probing/removal                                                    *
  47  *                                                                           *
  48 \*****************************************************************************/
  49
  50 static int __devinit sdhci_pltfm_probe(struct platform_device *pdev)
  51 {
  52         struct sdhci_host *host;
  53         struct resource *iomem;
  54         int ret;
  55
  56         BUG_ON(pdev == NULL);
  57
  58         iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  59         if (!iomem) {
  60                 ret = -ENOMEM;
  61                 goto err;
  62         }
  63
  64         if (resource_size(iomem) != 0x100)
  65                 dev_err(&pdev->dev, "Invalid iomem size. You may "
  66                         "experience problems.\n");
  67
  68         if (pdev->dev.parent)
  69                 host = sdhci_alloc_host(pdev->dev.parent, 0);
  70         else
  71                 host = sdhci_alloc_host(&pdev->dev, 0);
  72
  73         if (IS_ERR(host)) {
  74                 ret = PTR_ERR(host);
  75                 goto err;
  76         }
  77
  78         host->hw_name = "platform";
  79         host->ops = &sdhci_pltfm_ops;
  80         host->irq = platform_get_irq(pdev, 0);
  81
  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;
  87         }
  88
  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;
  94         }
  95
  96         ret = sdhci_add_host(host);
  97         if (ret)
  98                 goto err_add_host;
  99
 100         platform_set_drvdata(pdev, host);
 101
 102         return 0;
 103
 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;
 113 }
 114
 115 static int __devexit sdhci_pltfm_remove(struct platform_device *pdev)
 116 {
 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;
 121
 122         dead = 0;
 123         scratch = readl(host->ioaddr + SDHCI_INT_STATUS);
 124         if (scratch == (u32)-1)
 125                 dead = 1;
 126
 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);
 132
 133         return 0;
 134 }
 135
 136 static struct platform_driver sdhci_pltfm_driver = {
 137         .driver = {
 138                 .name   = "sdhci",
 139                 .owner  = THIS_MODULE,
 140         },
 141         .probe          = sdhci_pltfm_probe,
 142         .remove         = __devexit_p(sdhci_pltfm_remove),
 143 };
 144
 145 /*****************************************************************************\
 146  *                                                                           *
 147  * Driver init/exit                                                          *
 148  *                                                                           *
 149 \*****************************************************************************/
 150
 151 static int __init sdhci_drv_init(void)
 152 {
 153         return platform_driver_register(&sdhci_pltfm_driver);
 154 }
 155
 156 static void __exit sdhci_drv_exit(void)
 157 {
 158         platform_driver_unregister(&sdhci_pltfm_driver);
 159 }
 160
 161 module_init(sdhci_drv_init);
 162 module_exit(sdhci_drv_exit);
 163
 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");
 168