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, 2011 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                 if (of_device_is_compatible(np, "fsl,p2020-rev1-esdhc"))
  75                         host->quirks |= SDHCI_QUIRK_BROKEN_DMA;
  76
  77                 if (of_device_is_compatible(np, "fsl,p2020-esdhc") ||
  78                     of_device_is_compatible(np, "fsl,p1010-esdhc") ||
  79                     of_device_is_compatible(np, "fsl,mpc8536-esdhc"))
  80                         host->quirks |= SDHCI_QUIRK_BROKEN_TIMEOUT_VAL;
  81
  82                 clk = of_get_property(np, "clock-frequency", &size);
  83                 if (clk && size == sizeof(*clk) && *clk)
  84                         pltfm_host->clock = be32_to_cpup(clk);
  85         }
  86 }
  87 #else
  88 void sdhci_get_of_property(struct platform_device *pdev) {}
  89 #endif /* CONFIG_OF */
  90 EXPORT_SYMBOL_GPL(sdhci_get_of_property);
  91
  92 struct sdhci_host *sdhci_pltfm_init(struct platform_device *pdev,
  93                                     struct sdhci_pltfm_data *pdata)
  94 {
  95         struct sdhci_host *host;
  96         struct sdhci_pltfm_host *pltfm_host;
  97         struct device_node *np = pdev->dev.of_node;
  98         struct resource *iomem;
  99         int ret;
 100
 101         iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 102         if (!iomem) {
 103                 ret = -ENOMEM;
 104                 goto err;
 105         }
 106
 107         if (resource_size(iomem) < 0x100)
 108                 dev_err(&pdev->dev, "Invalid iomem size!\n");
 109
 110         /* Some PCI-based MFD need the parent here */
 111         if (pdev->dev.parent != &platform_bus && !np)
 112                 host = sdhci_alloc_host(pdev->dev.parent, sizeof(*pltfm_host));
 113         else
 114                 host = sdhci_alloc_host(&pdev->dev, sizeof(*pltfm_host));
 115
 116         if (IS_ERR(host)) {
 117                 ret = PTR_ERR(host);
 118                 goto err;
 119         }
 120
 121         pltfm_host = sdhci_priv(host);
 122
 123         host->hw_name = dev_name(&pdev->dev);
 124         if (pdata && pdata->ops)
 125                 host->ops = pdata->ops;
 126         else
 127                 host->ops = &sdhci_pltfm_ops;
 128         if (pdata)
 129                 host->quirks = pdata->quirks;
 130         host->irq = platform_get_irq(pdev, 0);
 131
 132         if (!request_mem_region(iomem->start, resource_size(iomem),
 133                 mmc_hostname(host->mmc))) {
 134                 dev_err(&pdev->dev, "cannot request region\n");
 135                 ret = -EBUSY;
 136                 goto err_request;
 137         }
 138
 139         host->ioaddr = ioremap(iomem->start, resource_size(iomem));
 140         if (!host->ioaddr) {
 141                 dev_err(&pdev->dev, "failed to remap registers\n");
 142                 ret = -ENOMEM;
 143                 goto err_remap;
 144         }
 145
 146         platform_set_drvdata(pdev, host);
 147
 148         return host;
 149
 150 err_remap:
 151         release_mem_region(iomem->start, resource_size(iomem));
 152 err_request:
 153         sdhci_free_host(host);
 154 err:
 155         dev_err(&pdev->dev, "%s failed %d\n", __func__, ret);
 156         return ERR_PTR(ret);
 157 }
 158 EXPORT_SYMBOL_GPL(sdhci_pltfm_init);
 159
 160 void sdhci_pltfm_free(struct platform_device *pdev)
 161 {
 162         struct sdhci_host *host = platform_get_drvdata(pdev);
 163         struct resource *iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 164
 165         iounmap(host->ioaddr);
 166         release_mem_region(iomem->start, resource_size(iomem));
 167         sdhci_free_host(host);
 168         platform_set_drvdata(pdev, NULL);
 169 }
 170 EXPORT_SYMBOL_GPL(sdhci_pltfm_free);
 171
 172 int sdhci_pltfm_register(struct platform_device *pdev,
 173                          struct sdhci_pltfm_data *pdata)
 174 {
 175         struct sdhci_host *host;
 176         int ret = 0;
 177
 178         host = sdhci_pltfm_init(pdev, pdata);
 179         if (IS_ERR(host))
 180                 return PTR_ERR(host);
 181
 182         sdhci_get_of_property(pdev);
 183
 184         ret = sdhci_add_host(host);
 185         if (ret)
 186                 sdhci_pltfm_free(pdev);
 187
 188         return ret;
 189 }
 190 EXPORT_SYMBOL_GPL(sdhci_pltfm_register);
 191
 192 int sdhci_pltfm_unregister(struct platform_device *pdev)
 193 {
 194         struct sdhci_host *host = platform_get_drvdata(pdev);
 195         int dead = (readl(host->ioaddr + SDHCI_INT_STATUS) == 0xffffffff);
 196
 197         sdhci_remove_host(host, dead);
 198         sdhci_pltfm_free(pdev);
 199
 200         return 0;
 201 }
 202 EXPORT_SYMBOL_GPL(sdhci_pltfm_unregister);
 203
 204 #ifdef CONFIG_PM
 205 static int sdhci_pltfm_suspend(struct device *dev)
 206 {
 207         struct sdhci_host *host = dev_get_drvdata(dev);
 208
 209         return sdhci_suspend_host(host);
 210 }
 211
 212 static int sdhci_pltfm_resume(struct device *dev)
 213 {
 214         struct sdhci_host *host = dev_get_drvdata(dev);
 215
 216         return sdhci_resume_host(host);
 217 }
 218
 219 const struct dev_pm_ops sdhci_pltfm_pmops = {
 220         .suspend        = sdhci_pltfm_suspend,
 221         .resume         = sdhci_pltfm_resume,
 222 };
 223 EXPORT_SYMBOL_GPL(sdhci_pltfm_pmops);
 224 #endif  /* CONFIG_PM */
 225
 226 static int __init sdhci_pltfm_drv_init(void)
 227 {
 228         pr_info("sdhci-pltfm: SDHCI platform and OF driver helper\n");
 229
 230         return 0;
 231 }
 232 module_init(sdhci_pltfm_drv_init);
 233
 234 static void __exit sdhci_pltfm_drv_exit(void)
 235 {
 236 }
 237 module_exit(sdhci_pltfm_drv_exit);
 238
 239 MODULE_DESCRIPTION("SDHCI platform and OF driver helper");
 240 MODULE_AUTHOR("Intel Corporation");
 241 MODULE_LICENSE("GPL v2");