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 #include <linux/sdhci-pltfm.h>
  33
  34 #include "sdhci.h"
  35
  36 /*****************************************************************************\
  37  *                                                                           *
  38  * SDHCI core callbacks                                                      *
  39  *                                                                           *
  40 \*****************************************************************************/
  41
  42 static struct sdhci_ops sdhci_pltfm_ops = {
  43 };
  44
  45 /*****************************************************************************\
  46  *                                                                           *
  47  * Device probing/removal                                                    *
  48  *                                                                           *
  49 \*****************************************************************************/
  50
  51 static int __devinit sdhci_pltfm_probe(struct platform_device *pdev)
  52 {
  53         struct sdhci_pltfm_data *pdata = pdev->dev.platform_data;
  54         struct sdhci_host *host;
  55         struct resource *iomem;
  56         int ret;
  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         if (pdata && pdata->ops)
  80                 host->ops = pdata->ops;
  81         else
  82                 host->ops = &sdhci_pltfm_ops;
  83         if (pdata)
  84                 host->quirks = pdata->quirks;
  85         host->irq = platform_get_irq(pdev, 0);
  86
  87         if (!request_mem_region(iomem->start, resource_size(iomem),
  88                 mmc_hostname(host->mmc))) {
  89                 dev_err(&pdev->dev, "cannot request region\n");
  90                 ret = -EBUSY;
  91                 goto err_request;
  92         }
  93
  94         host->ioaddr = ioremap(iomem->start, resource_size(iomem));
  95         if (!host->ioaddr) {
  96                 dev_err(&pdev->dev, "failed to remap registers\n");
  97                 ret = -ENOMEM;
  98                 goto err_remap;
  99         }
 100
 101         if (pdata && pdata->init) {
 102                 ret = pdata->init(host);
 103                 if (ret)
 104                         goto err_plat_init;
 105         }
 106
 107         ret = sdhci_add_host(host);
 108         if (ret)
 109                 goto err_add_host;
 110
 111         platform_set_drvdata(pdev, host);
 112
 113         return 0;
 114
 115 err_add_host:
 116         if (pdata && pdata->exit)
 117                 pdata->exit(host);
 118 err_plat_init:
 119         iounmap(host->ioaddr);
 120 err_remap:
 121         release_mem_region(iomem->start, resource_size(iomem));
 122 err_request:
 123         sdhci_free_host(host);
 124 err:
 125         printk(KERN_ERR"Probing of sdhci-pltfm failed: %d\n", ret);
 126         return ret;
 127 }
 128
 129 static int __devexit sdhci_pltfm_remove(struct platform_device *pdev)
 130 {
 131         struct sdhci_pltfm_data *pdata = pdev->dev.platform_data;
 132         struct sdhci_host *host = platform_get_drvdata(pdev);
 133         struct resource *iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 134         int dead;
 135         u32 scratch;
 136
 137         dead = 0;
 138         scratch = readl(host->ioaddr + SDHCI_INT_STATUS);
 139         if (scratch == (u32)-1)
 140                 dead = 1;
 141
 142         sdhci_remove_host(host, dead);
 143         if (pdata && pdata->exit)
 144                 pdata->exit(host);
 145         iounmap(host->ioaddr);
 146         release_mem_region(iomem->start, resource_size(iomem));
 147         sdhci_free_host(host);
 148         platform_set_drvdata(pdev, NULL);
 149
 150         return 0;
 151 }
 152
 153 static struct platform_driver sdhci_pltfm_driver = {
 154         .driver = {
 155                 .name   = "sdhci",
 156                 .owner  = THIS_MODULE,
 157         },
 158         .probe          = sdhci_pltfm_probe,
 159         .remove         = __devexit_p(sdhci_pltfm_remove),
 160 };
 161
 162 /*****************************************************************************\
 163  *                                                                           *
 164  * Driver init/exit                                                          *
 165  *                                                                           *
 166 \*****************************************************************************/
 167
 168 static int __init sdhci_drv_init(void)
 169 {
 170         return platform_driver_register(&sdhci_pltfm_driver);
 171 }
 172
 173 static void __exit sdhci_drv_exit(void)
 174 {
 175         platform_driver_unregister(&sdhci_pltfm_driver);
 176 }
 177
 178 module_init(sdhci_drv_init);
 179 module_exit(sdhci_drv_exit);
 180
 181 MODULE_DESCRIPTION("Secure Digital Host Controller Interface platform driver");
 182 MODULE_AUTHOR("Mocean Laboratories <info@mocean-labs.com>");
 183 MODULE_LICENSE("GPL v2");
 184 MODULE_ALIAS("platform:sdhci");