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             of_get_property(np, "wp-inverted", NULL))
  47                 return true;
  48
  49         /* Old device trees don't have the wp-inverted property. */
  50 #ifdef CONFIG_PPC
  51         return machine_is(mpc837x_rdb) || machine_is(mpc837x_mds);
  52 #else
  53         return false;
  54 #endif /* CONFIG_PPC */
  55 }
  56
  57 void sdhci_get_of_property(struct platform_device *pdev)
  58 {
  59         struct device_node *np = pdev->dev.of_node;
  60         struct sdhci_host *host = platform_get_drvdata(pdev);
  61         struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
  62         const __be32 *clk;
  63         u32 bus_width;
  64         int size;
  65
  66         if (of_device_is_available(np)) {
  67                 if (of_get_property(np, "sdhci,auto-cmd12", NULL))
  68                         host->quirks |= SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12;
  69
  70                 if (of_get_property(np, "sdhci,1-bit-only", NULL) ||
  71                     (of_property_read_u32(np, "bus-width", &bus_width) == 0 &&
  72                     bus_width == 1))
  73                         host->quirks |= SDHCI_QUIRK_FORCE_1_BIT_DATA;
  74
  75                 if (sdhci_of_wp_inverted(np))
  76                         host->quirks |= SDHCI_QUIRK_INVERTED_WRITE_PROTECT;
  77
  78                 if (of_get_property(np, "broken-cd", NULL))
  79                         host->quirks |= SDHCI_QUIRK_BROKEN_CARD_DETECTION;
  80
  81                 if (of_device_is_compatible(np, "fsl,p2020-rev1-esdhc"))
  82                         host->quirks |= SDHCI_QUIRK_BROKEN_DMA;
  83
  84                 if (of_device_is_compatible(np, "fsl,p2020-esdhc") ||
  85                     of_device_is_compatible(np, "fsl,p1010-esdhc") ||
  86                     of_device_is_compatible(np, "fsl,mpc8536-esdhc"))
  87                         host->quirks |= SDHCI_QUIRK_BROKEN_TIMEOUT_VAL;
  88
  89                 clk = of_get_property(np, "clock-frequency", &size);
  90                 if (clk && size == sizeof(*clk) && *clk)
  91                         pltfm_host->clock = be32_to_cpup(clk);
  92         }
  93 }
  94 #else
  95 void sdhci_get_of_property(struct platform_device *pdev) {}
  96 #endif /* CONFIG_OF */
  97 EXPORT_SYMBOL_GPL(sdhci_get_of_property);
  98
  99 struct sdhci_host *sdhci_pltfm_init(struct platform_device *pdev,
 100                                     struct sdhci_pltfm_data *pdata)
 101 {
 102         struct sdhci_host *host;
 103         struct sdhci_pltfm_host *pltfm_host;
 104         struct device_node *np = pdev->dev.of_node;
 105         struct resource *iomem;
 106         int ret;
 107
 108         iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 109         if (!iomem) {
 110                 ret = -ENOMEM;
 111                 goto err;
 112         }
 113
 114         if (resource_size(iomem) < 0x100)
 115                 dev_err(&pdev->dev, "Invalid iomem size!\n");
 116
 117         /* Some PCI-based MFD need the parent here */
 118         if (pdev->dev.parent != &platform_bus && !np)
 119                 host = sdhci_alloc_host(pdev->dev.parent, sizeof(*pltfm_host));
 120         else
 121                 host = sdhci_alloc_host(&pdev->dev, sizeof(*pltfm_host));
 122
 123         if (IS_ERR(host)) {
 124                 ret = PTR_ERR(host);
 125                 goto err;
 126         }
 127
 128         pltfm_host = sdhci_priv(host);
 129
 130         host->hw_name = dev_name(&pdev->dev);
 131         if (pdata && pdata->ops)
 132                 host->ops = pdata->ops;
 133         else
 134                 host->ops = &sdhci_pltfm_ops;
 135         if (pdata)
 136                 host->quirks = pdata->quirks;
 137         host->irq = platform_get_irq(pdev, 0);
 138
 139         if (!request_mem_region(iomem->start, resource_size(iomem),
 140                 mmc_hostname(host->mmc))) {
 141                 dev_err(&pdev->dev, "cannot request region\n");
 142                 ret = -EBUSY;
 143                 goto err_request;
 144         }
 145
 146         host->ioaddr = ioremap(iomem->start, resource_size(iomem));
 147         if (!host->ioaddr) {
 148                 dev_err(&pdev->dev, "failed to remap registers\n");
 149                 ret = -ENOMEM;
 150                 goto err_remap;
 151         }
 152
 153         /*
 154          * Some platforms need to probe the controller to be able to
 155          * determine which caps should be used.
 156          */
 157         if (host->ops && host->ops->platform_init)
 158                 host->ops->platform_init(host);
 159
 160         platform_set_drvdata(pdev, host);
 161
 162         return host;
 163
 164 err_remap:
 165         release_mem_region(iomem->start, resource_size(iomem));
 166 err_request:
 167         sdhci_free_host(host);
 168 err:
 169         dev_err(&pdev->dev, "%s failed %d\n", __func__, ret);
 170         return ERR_PTR(ret);
 171 }
 172 EXPORT_SYMBOL_GPL(sdhci_pltfm_init);
 173
 174 void sdhci_pltfm_free(struct platform_device *pdev)
 175 {
 176         struct sdhci_host *host = platform_get_drvdata(pdev);
 177         struct resource *iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 178
 179         iounmap(host->ioaddr);
 180         release_mem_region(iomem->start, resource_size(iomem));
 181         sdhci_free_host(host);
 182         platform_set_drvdata(pdev, NULL);
 183 }
 184 EXPORT_SYMBOL_GPL(sdhci_pltfm_free);
 185
 186 int sdhci_pltfm_register(struct platform_device *pdev,
 187                          struct sdhci_pltfm_data *pdata)
 188 {
 189         struct sdhci_host *host;
 190         int ret = 0;
 191
 192         host = sdhci_pltfm_init(pdev, pdata);
 193         if (IS_ERR(host))
 194                 return PTR_ERR(host);
 195
 196         sdhci_get_of_property(pdev);
 197
 198         ret = sdhci_add_host(host);
 199         if (ret)
 200                 sdhci_pltfm_free(pdev);
 201
 202         return ret;
 203 }
 204 EXPORT_SYMBOL_GPL(sdhci_pltfm_register);
 205
 206 int sdhci_pltfm_unregister(struct platform_device *pdev)
 207 {
 208         struct sdhci_host *host = platform_get_drvdata(pdev);
 209         int dead = (readl(host->ioaddr + SDHCI_INT_STATUS) == 0xffffffff);
 210
 211         sdhci_remove_host(host, dead);
 212         sdhci_pltfm_free(pdev);
 213
 214         return 0;
 215 }
 216 EXPORT_SYMBOL_GPL(sdhci_pltfm_unregister);
 217
 218 #ifdef CONFIG_PM
 219 static int sdhci_pltfm_suspend(struct device *dev)
 220 {
 221         struct sdhci_host *host = dev_get_drvdata(dev);
 222
 223         return sdhci_suspend_host(host);
 224 }
 225
 226 static int sdhci_pltfm_resume(struct device *dev)
 227 {
 228         struct sdhci_host *host = dev_get_drvdata(dev);
 229
 230         return sdhci_resume_host(host);
 231 }
 232
 233 const struct dev_pm_ops sdhci_pltfm_pmops = {
 234         .suspend        = sdhci_pltfm_suspend,
 235         .resume         = sdhci_pltfm_resume,
 236 };
 237 EXPORT_SYMBOL_GPL(sdhci_pltfm_pmops);
 238 #endif  /* CONFIG_PM */
 239
 240 static int __init sdhci_pltfm_drv_init(void)
 241 {
 242         pr_info("sdhci-pltfm: SDHCI platform and OF driver helper\n");
 243
 244         return 0;
 245 }
 246 module_init(sdhci_pltfm_drv_init);
 247
 248 static void __exit sdhci_pltfm_drv_exit(void)
 249 {
 250 }
 251 module_exit(sdhci_pltfm_drv_exit);
 252
 253 MODULE_DESCRIPTION("SDHCI platform and OF driver helper");
 254 MODULE_AUTHOR("Intel Corporation");
 255 MODULE_LICENSE("GPL v2");