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/module.h>
  33 #include <linux/of.h>
  34 #ifdef CONFIG_PPC
  35 #include <asm/machdep.h>
  36 #endif
  37 #include "sdhci-pltfm.h"
  38
  39 static struct sdhci_ops sdhci_pltfm_ops = {
  40 };
  41
  42 #ifdef CONFIG_OF
  43 static bool sdhci_of_wp_inverted(struct device_node *np)
  44 {
  45         if (of_get_property(np, "sdhci,wp-inverted", NULL))
  46                 return true;
  47
  48         /* Old device trees don't have the wp-inverted property. */
  49 #ifdef CONFIG_PPC
  50         return machine_is(mpc837x_rdb) || machine_is(mpc837x_mds);
  51 #else
  52         return false;
  53 #endif /* CONFIG_PPC */
  54 }
  55
  56 void sdhci_get_of_property(struct platform_device *pdev)
  57 {
  58         struct device_node *np = pdev->dev.of_node;
  59         struct sdhci_host *host = platform_get_drvdata(pdev);
  60         struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
  61         const __be32 *clk;
  62         int size;
  63
  64         if (of_device_is_available(np)) {
  65                 if (of_get_property(np, "sdhci,auto-cmd12", NULL))
  66                         host->quirks |= SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12;
  67
  68                 if (of_get_property(np, "sdhci,1-bit-only", NULL))
  69                         host->quirks |= SDHCI_QUIRK_FORCE_1_BIT_DATA;
  70
  71                 if (sdhci_of_wp_inverted(np))
  72                         host->quirks |= SDHCI_QUIRK_INVERTED_WRITE_PROTECT;
  73
  74                 clk = of_get_property(np, "clock-frequency", &size);
  75                 if (clk && size == sizeof(*clk) && *clk)
  76                         pltfm_host->clock = be32_to_cpup(clk);
  77         }
  78 }
  79 #else
  80 void sdhci_get_of_property(struct platform_device *pdev) {}
  81 #endif /* CONFIG_OF */
  82 EXPORT_SYMBOL_GPL(sdhci_get_of_property);
  83
  84 struct sdhci_host *sdhci_pltfm_init(struct platform_device *pdev,
  85                                     struct sdhci_pltfm_data *pdata)
  86 {
  87         struct sdhci_host *host;
  88         struct sdhci_pltfm_host *pltfm_host;
  89         struct device_node *np = pdev->dev.of_node;
  90         struct resource *iomem;
  91         int ret;
  92
  93         iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  94         if (!iomem) {
  95                 ret = -ENOMEM;
  96                 goto err;
  97         }
  98
  99         if (resource_size(iomem) < 0x100)
 100                 dev_err(&pdev->dev, "Invalid iomem size!\n");
 101
 102         /* Some PCI-based MFD need the parent here */
 103         if (pdev->dev.parent != &platform_bus && !np)
 104                 host = sdhci_alloc_host(pdev->dev.parent, sizeof(*pltfm_host));
 105         else
 106                 host = sdhci_alloc_host(&pdev->dev, sizeof(*pltfm_host));
 107
 108         if (IS_ERR(host)) {
 109                 ret = PTR_ERR(host);
 110                 goto err;
 111         }
 112
 113         pltfm_host = sdhci_priv(host);
 114
 115         host->hw_name = dev_name(&pdev->dev);
 116         if (pdata && pdata->ops)
 117                 host->ops = pdata->ops;
 118         else
 119                 host->ops = &sdhci_pltfm_ops;
 120         if (pdata)
 121                 host->quirks = pdata->quirks;
 122         host->irq = platform_get_irq(pdev, 0);
 123
 124         if (!request_mem_region(iomem->start, resource_size(iomem),
 125                 mmc_hostname(host->mmc))) {
 126                 dev_err(&pdev->dev, "cannot request region\n");
 127                 ret = -EBUSY;
 128                 goto err_request;
 129         }
 130
 131         host->ioaddr = ioremap(iomem->start, resource_size(iomem));
 132         if (!host->ioaddr) {
 133                 dev_err(&pdev->dev, "failed to remap registers\n");
 134                 ret = -ENOMEM;
 135                 goto err_remap;
 136         }
 137
 138         platform_set_drvdata(pdev, host);
 139
 140         return host;
 141
 142 err_remap:
 143         release_mem_region(iomem->start, resource_size(iomem));
 144 err_request:
 145         sdhci_free_host(host);
 146 err:
 147         dev_err(&pdev->dev, "%s failed %d\n", __func__, ret);
 148         return ERR_PTR(ret);
 149 }
 150 EXPORT_SYMBOL_GPL(sdhci_pltfm_init);
 151
 152 void sdhci_pltfm_free(struct platform_device *pdev)
 153 {
 154         struct sdhci_host *host = platform_get_drvdata(pdev);
 155         struct resource *iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 156
 157         iounmap(host->ioaddr);
 158         release_mem_region(iomem->start, resource_size(iomem));
 159         sdhci_free_host(host);
 160         platform_set_drvdata(pdev, NULL);
 161 }
 162 EXPORT_SYMBOL_GPL(sdhci_pltfm_free);
 163
 164 int sdhci_pltfm_register(struct platform_device *pdev,
 165                          struct sdhci_pltfm_data *pdata)
 166 {
 167         struct sdhci_host *host;
 168         int ret = 0;
 169
 170         host = sdhci_pltfm_init(pdev, pdata);
 171         if (IS_ERR(host))
 172                 return PTR_ERR(host);
 173
 174         sdhci_get_of_property(pdev);
 175
 176         ret = sdhci_add_host(host);
 177         if (ret)
 178                 sdhci_pltfm_free(pdev);
 179
 180         return ret;
 181 }
 182 EXPORT_SYMBOL_GPL(sdhci_pltfm_register);
 183
 184 int sdhci_pltfm_unregister(struct platform_device *pdev)
 185 {
 186         struct sdhci_host *host = platform_get_drvdata(pdev);
 187         int dead = (readl(host->ioaddr + SDHCI_INT_STATUS) == 0xffffffff);
 188
 189         sdhci_remove_host(host, dead);
 190         sdhci_pltfm_free(pdev);
 191
 192         return 0;
 193 }
 194 EXPORT_SYMBOL_GPL(sdhci_pltfm_unregister);
 195
 196 #ifdef CONFIG_PM
 197 static int sdhci_pltfm_suspend(struct device *dev)
 198 {
 199         struct sdhci_host *host = dev_get_drvdata(dev);
 200
 201         return sdhci_suspend_host(host);
 202 }
 203
 204 static int sdhci_pltfm_resume(struct device *dev)
 205 {
 206         struct sdhci_host *host = dev_get_drvdata(dev);
 207
 208         return sdhci_resume_host(host);
 209 }
 210
 211 const struct dev_pm_ops sdhci_pltfm_pmops = {
 212         .suspend        = sdhci_pltfm_suspend,
 213         .resume         = sdhci_pltfm_resume,
 214 };
 215 EXPORT_SYMBOL_GPL(sdhci_pltfm_pmops);
 216 #endif  /* CONFIG_PM */
 217
 218 static int __init sdhci_pltfm_drv_init(void)
 219 {
 220         pr_info("sdhci-pltfm: SDHCI platform and OF driver helper\n");
 221
 222         return 0;
 223 }
 224 module_init(sdhci_pltfm_drv_init);
 225
 226 static void __exit sdhci_pltfm_drv_exit(void)
 227 {
 228 }
 229 module_exit(sdhci_pltfm_drv_exit);
 230
 231 MODULE_DESCRIPTION("SDHCI platform and OF driver helper");
 232 MODULE_AUTHOR("Intel Corporation");
 233 MODULE_LICENSE("GPL v2");