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 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/of.h>
  33 #ifdef CONFIG_PPC
  34 #include <asm/machdep.h>
  35 #endif
  36 #include "sdhci-pltfm.h"
  37
  38 static struct sdhci_ops sdhci_pltfm_ops = {
  39 };
  40
  41 #ifdef CONFIG_OF
  42 static bool sdhci_of_wp_inverted(struct device_node *np)
  43 {
  44         if (of_get_property(np, "sdhci,wp-inverted", NULL))
  45                 return true;
  46
  47         /* Old device trees don't have the wp-inverted property. */
  48 #ifdef CONFIG_PPC
  49         return machine_is(mpc837x_rdb) || machine_is(mpc837x_mds);
  50 #else
  51         return false;
  52 #endif /* CONFIG_PPC */
  53 }
  54
  55 void sdhci_get_of_property(struct platform_device *pdev)
  56 {
  57         struct device_node *np = pdev->dev.of_node;
  58         struct sdhci_host *host = platform_get_drvdata(pdev);
  59         struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
  60         const __be32 *clk;
  61         int size;
  62
  63         if (of_device_is_available(np)) {
  64                 if (of_get_property(np, "sdhci,auto-cmd12", NULL))
  65                         host->quirks |= SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12;
  66
  67                 if (of_get_property(np, "sdhci,1-bit-only", NULL))
  68                         host->quirks |= SDHCI_QUIRK_FORCE_1_BIT_DATA;
  69
  70                 if (sdhci_of_wp_inverted(np))
  71                         host->quirks |= SDHCI_QUIRK_INVERTED_WRITE_PROTECT;
  72
  73                 clk = of_get_property(np, "clock-frequency", &size);
  74                 if (clk && size == sizeof(*clk) && *clk)
  75                         pltfm_host->clock = be32_to_cpup(clk);
  76         }
  77 }
  78 #else
  79 void sdhci_get_of_property(struct platform_device *pdev) {}
  80 #endif /* CONFIG_OF */
  81 EXPORT_SYMBOL_GPL(sdhci_get_of_property);
  82
  83 struct sdhci_host *sdhci_pltfm_init(struct platform_device *pdev,
  84                                     struct sdhci_pltfm_data *pdata)
  85 {
  86         struct sdhci_host *host;
  87         struct sdhci_pltfm_host *pltfm_host;
  88         struct resource *iomem;
  89         int ret;
  90
  91         iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  92         if (!iomem) {
  93                 ret = -ENOMEM;
  94                 goto err;
  95         }
  96
  97         if (resource_size(iomem) < 0x100)
  98                 dev_err(&pdev->dev, "Invalid iomem size!\n");
  99
 100         /* Some PCI-based MFD need the parent here */
 101         if (pdev->dev.parent != &platform_bus)
 102                 host = sdhci_alloc_host(pdev->dev.parent, sizeof(*pltfm_host));
 103         else
 104                 host = sdhci_alloc_host(&pdev->dev, sizeof(*pltfm_host));
 105
 106         if (IS_ERR(host)) {
 107                 ret = PTR_ERR(host);
 108                 goto err;
 109         }
 110
 111         pltfm_host = sdhci_priv(host);
 112
 113         host->hw_name = dev_name(&pdev->dev);
 114         if (pdata && pdata->ops)
 115                 host->ops = pdata->ops;
 116         else
 117                 host->ops = &sdhci_pltfm_ops;
 118         if (pdata)
 119                 host->quirks = pdata->quirks;
 120         host->irq = platform_get_irq(pdev, 0);
 121
 122         if (!request_mem_region(iomem->start, resource_size(iomem),
 123                 mmc_hostname(host->mmc))) {
 124                 dev_err(&pdev->dev, "cannot request region\n");
 125                 ret = -EBUSY;
 126                 goto err_request;
 127         }
 128
 129         host->ioaddr = ioremap(iomem->start, resource_size(iomem));
 130         if (!host->ioaddr) {
 131                 dev_err(&pdev->dev, "failed to remap registers\n");
 132                 ret = -ENOMEM;
 133                 goto err_remap;
 134         }
 135
 136         platform_set_drvdata(pdev, host);
 137
 138         return host;
 139
 140 err_remap:
 141         release_mem_region(iomem->start, resource_size(iomem));
 142 err_request:
 143         sdhci_free_host(host);
 144 err:
 145         dev_err(&pdev->dev, "%s failed %d\n", __func__, ret);
 146         return ERR_PTR(ret);
 147 }
 148 EXPORT_SYMBOL_GPL(sdhci_pltfm_init);
 149
 150 void sdhci_pltfm_free(struct platform_device *pdev)
 151 {
 152         struct sdhci_host *host = platform_get_drvdata(pdev);
 153         struct resource *iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 154
 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 EXPORT_SYMBOL_GPL(sdhci_pltfm_free);
 161
 162 int sdhci_pltfm_register(struct platform_device *pdev,
 163                          struct sdhci_pltfm_data *pdata)
 164 {
 165         struct sdhci_host *host;
 166         int ret = 0;
 167
 168         host = sdhci_pltfm_init(pdev, pdata);
 169         if (IS_ERR(host))
 170                 return PTR_ERR(host);
 171
 172         sdhci_get_of_property(pdev);
 173
 174         ret = sdhci_add_host(host);
 175         if (ret)
 176                 sdhci_pltfm_free(pdev);
 177
 178         return ret;
 179 }
 180 EXPORT_SYMBOL_GPL(sdhci_pltfm_register);
 181
 182 int sdhci_pltfm_unregister(struct platform_device *pdev)
 183 {
 184         struct sdhci_host *host = platform_get_drvdata(pdev);
 185         int dead = (readl(host->ioaddr + SDHCI_INT_STATUS) == 0xffffffff);
 186
 187         sdhci_remove_host(host, dead);
 188         sdhci_pltfm_free(pdev);
 189
 190         return 0;
 191 }
 192 EXPORT_SYMBOL_GPL(sdhci_pltfm_unregister);
 193
 194 #ifdef CONFIG_PM
 195 int sdhci_pltfm_suspend(struct platform_device *dev, pm_message_t state)
 196 {
 197         struct sdhci_host *host = platform_get_drvdata(dev);
 198
 199         return sdhci_suspend_host(host, state);
 200 }
 201 EXPORT_SYMBOL_GPL(sdhci_pltfm_suspend);
 202
 203 int sdhci_pltfm_resume(struct platform_device *dev)
 204 {
 205         struct sdhci_host *host = platform_get_drvdata(dev);
 206
 207         return sdhci_resume_host(host);
 208 }
 209 EXPORT_SYMBOL_GPL(sdhci_pltfm_resume);
 210 #endif  /* CONFIG_PM */
 211
 212 static int __init sdhci_pltfm_drv_init(void)
 213 {
 214         pr_info("sdhci-pltfm: SDHCI platform and OF driver helper\n");
 215
 216         return 0;
 217 }
 218 module_init(sdhci_pltfm_drv_init);
 219
 220 static void __exit sdhci_pltfm_drv_exit(void)
 221 {
 222 }
 223 module_exit(sdhci_pltfm_drv_exit);
 224
 225 MODULE_DESCRIPTION("SDHCI platform and OF driver helper");
 226 MODULE_AUTHOR("Intel Corporation");
 227 MODULE_LICENSE("GPL v2");