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/mod_devicetable.h>
  28 #include <linux/platform_device.h>
  29
  30 #include <linux/mmc/host.h>
  31
  32 #include <linux/io.h>
  33 #include <linux/sdhci-pltfm.h>
  34
  35 #include "sdhci.h"
  36 #include "sdhci-pltfm.h"
  37
  38 /*****************************************************************************\
  39  *                                                                           *
  40  * SDHCI core callbacks                                                      *
  41  *                                                                           *
  42 \*****************************************************************************/
  43
  44 static struct sdhci_ops sdhci_pltfm_ops = {
  45 };
  46
  47 /*****************************************************************************\
  48  *                                                                           *
  49  * Device probing/removal                                                    *
  50  *                                                                           *
  51 \*****************************************************************************/
  52
  53 static int __devinit sdhci_pltfm_probe(struct platform_device *pdev)
  54 {
  55         struct sdhci_pltfm_data *pdata = pdev->dev.platform_data;
  56         const struct platform_device_id *platid = platform_get_device_id(pdev);
  57         struct sdhci_host *host;
  58         struct sdhci_pltfm_host *pltfm_host;
  59         struct resource *iomem;
  60         int ret;
  61
  62         if (!pdata && platid && platid->driver_data)
  63                 pdata = (void *)platid->driver_data;
  64
  65         iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  66         if (!iomem) {
  67                 ret = -ENOMEM;
  68                 goto err;
  69         }
  70
  71         if (resource_size(iomem) < 0x100)
  72                 dev_err(&pdev->dev, "Invalid iomem size. You may "
  73                         "experience problems.\n");
  74
  75         /* Some PCI-based MFD need the parent here */
  76         if (pdev->dev.parent != &platform_bus)
  77                 host = sdhci_alloc_host(pdev->dev.parent, sizeof(*pltfm_host));
  78         else
  79                 host = sdhci_alloc_host(&pdev->dev, sizeof(*pltfm_host));
  80
  81         if (IS_ERR(host)) {
  82                 ret = PTR_ERR(host);
  83                 goto err;
  84         }
  85
  86         pltfm_host = sdhci_priv(host);
  87
  88         host->hw_name = "platform";
  89         if (pdata && pdata->ops)
  90                 host->ops = pdata->ops;
  91         else
  92                 host->ops = &sdhci_pltfm_ops;
  93         if (pdata)
  94                 host->quirks = pdata->quirks;
  95         host->irq = platform_get_irq(pdev, 0);
  96
  97         if (!request_mem_region(iomem->start, resource_size(iomem),
  98                 mmc_hostname(host->mmc))) {
  99                 dev_err(&pdev->dev, "cannot request region\n");
 100                 ret = -EBUSY;
 101                 goto err_request;
 102         }
 103
 104         host->ioaddr = ioremap(iomem->start, resource_size(iomem));
 105         if (!host->ioaddr) {
 106                 dev_err(&pdev->dev, "failed to remap registers\n");
 107                 ret = -ENOMEM;
 108                 goto err_remap;
 109         }
 110
 111         if (pdata && pdata->init) {
 112                 ret = pdata->init(host);
 113                 if (ret)
 114                         goto err_plat_init;
 115         }
 116
 117         ret = sdhci_add_host(host);
 118         if (ret)
 119                 goto err_add_host;
 120
 121         platform_set_drvdata(pdev, host);
 122
 123         return 0;
 124
 125 err_add_host:
 126         if (pdata && pdata->exit)
 127                 pdata->exit(host);
 128 err_plat_init:
 129         iounmap(host->ioaddr);
 130 err_remap:
 131         release_mem_region(iomem->start, resource_size(iomem));
 132 err_request:
 133         sdhci_free_host(host);
 134 err:
 135         printk(KERN_ERR"Probing of sdhci-pltfm failed: %d\n", ret);
 136         return ret;
 137 }
 138
 139 static int __devexit sdhci_pltfm_remove(struct platform_device *pdev)
 140 {
 141         struct sdhci_pltfm_data *pdata = pdev->dev.platform_data;
 142         struct sdhci_host *host = platform_get_drvdata(pdev);
 143         struct resource *iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 144         int dead;
 145         u32 scratch;
 146
 147         dead = 0;
 148         scratch = readl(host->ioaddr + SDHCI_INT_STATUS);
 149         if (scratch == (u32)-1)
 150                 dead = 1;
 151
 152         sdhci_remove_host(host, dead);
 153         if (pdata && pdata->exit)
 154                 pdata->exit(host);
 155         iounmap(host->ioaddr);
 156         release_mem_region(iomem->start, resource_size(iomem));
 157         sdhci_free_host(host);
 158         platform_set_drvdata(pdev, NULL);
 159
 160         return 0;
 161 }
 162
 163 static const struct platform_device_id sdhci_pltfm_ids[] = {
 164         { "sdhci", },
 165 #ifdef CONFIG_MMC_SDHCI_CNS3XXX
 166         { "sdhci-cns3xxx", (kernel_ulong_t)&sdhci_cns3xxx_pdata },
 167 #endif
 168         { },
 169 };
 170 MODULE_DEVICE_TABLE(platform, sdhci_pltfm_ids);
 171
 172 #ifdef CONFIG_PM
 173 static int sdhci_pltfm_suspend(struct platform_device *dev, pm_message_t state)
 174 {
 175         struct sdhci_host *host = platform_get_drvdata(dev);
 176
 177         return sdhci_suspend_host(host, state);
 178 }
 179
 180 static int sdhci_pltfm_resume(struct platform_device *dev)
 181 {
 182         struct sdhci_host *host = platform_get_drvdata(dev);
 183
 184         return sdhci_resume_host(host);
 185 }
 186 #else
 187 #define sdhci_pltfm_suspend     NULL
 188 #define sdhci_pltfm_resume      NULL
 189 #endif  /* CONFIG_PM */
 190
 191 static struct platform_driver sdhci_pltfm_driver = {
 192         .driver = {
 193                 .name   = "sdhci",
 194                 .owner  = THIS_MODULE,
 195         },
 196         .probe          = sdhci_pltfm_probe,
 197         .remove         = __devexit_p(sdhci_pltfm_remove),
 198         .id_table       = sdhci_pltfm_ids,
 199         .suspend        = sdhci_pltfm_suspend,
 200         .resume         = sdhci_pltfm_resume,
 201 };
 202
 203 /*****************************************************************************\
 204  *                                                                           *
 205  * Driver init/exit                                                          *
 206  *                                                                           *
 207 \*****************************************************************************/
 208
 209 static int __init sdhci_drv_init(void)
 210 {
 211         return platform_driver_register(&sdhci_pltfm_driver);
 212 }
 213
 214 static void __exit sdhci_drv_exit(void)
 215 {
 216         platform_driver_unregister(&sdhci_pltfm_driver);
 217 }
 218
 219 module_init(sdhci_drv_init);
 220 module_exit(sdhci_drv_exit);
 221
 222 MODULE_DESCRIPTION("Secure Digital Host Controller Interface platform driver");
 223 MODULE_AUTHOR("Mocean Laboratories <info@mocean-labs.com>");
 224 MODULE_LICENSE("GPL v2");