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_get_property(np, "no-1-8-v", NULL))
  82                         host->quirks2 |= SDHCI_QUIRK2_NO_1_8_V;
  83
  84                 if (of_device_is_compatible(np, "fsl,p2020-rev1-esdhc"))
  85                         host->quirks |= SDHCI_QUIRK_BROKEN_DMA;
  86
  87                 if (of_device_is_compatible(np, "fsl,p2020-esdhc") ||
  88                     of_device_is_compatible(np, "fsl,p1010-esdhc") ||
  89                     of_device_is_compatible(np, "fsl,mpc8536-esdhc"))
  90                         host->quirks |= SDHCI_QUIRK_BROKEN_TIMEOUT_VAL;
  91
  92                 clk = of_get_property(np, "clock-frequency", &size);
  93                 if (clk && size == sizeof(*clk) && *clk)
  94                         pltfm_host->clock = be32_to_cpup(clk);
  95
  96                 if (of_find_property(np, "keep-power-in-suspend", NULL))
  97                         host->mmc->pm_caps |= MMC_PM_KEEP_POWER;
  98
  99                 if (of_find_property(np, "enable-sdio-wakeup", NULL))
 100                         host->mmc->pm_caps |= MMC_PM_WAKE_SDIO_IRQ;
 101         }
 102 }
 103 #else
 104 void sdhci_get_of_property(struct platform_device *pdev) {}
 105 #endif /* CONFIG_OF */
 106 EXPORT_SYMBOL_GPL(sdhci_get_of_property);
 107
 108 struct sdhci_host *sdhci_pltfm_init(struct platform_device *pdev,
 109                                     struct sdhci_pltfm_data *pdata)
 110 {
 111         struct sdhci_host *host;
 112         struct sdhci_pltfm_host *pltfm_host;
 113         struct device_node *np = pdev->dev.of_node;
 114         struct resource *iomem;
 115         int ret;
 116
 117         iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 118         if (!iomem) {
 119                 ret = -ENOMEM;
 120                 goto err;
 121         }
 122
 123         if (resource_size(iomem) < 0x100)
 124                 dev_err(&pdev->dev, "Invalid iomem size!\n");
 125
 126         /* Some PCI-based MFD need the parent here */
 127         if (pdev->dev.parent != &platform_bus && !np)
 128                 host = sdhci_alloc_host(pdev->dev.parent, sizeof(*pltfm_host));
 129         else
 130                 host = sdhci_alloc_host(&pdev->dev, sizeof(*pltfm_host));
 131
 132         if (IS_ERR(host)) {
 133                 ret = PTR_ERR(host);
 134                 goto err;
 135         }
 136
 137         pltfm_host = sdhci_priv(host);
 138
 139         host->hw_name = dev_name(&pdev->dev);
 140         if (pdata && pdata->ops)
 141                 host->ops = pdata->ops;
 142         else
 143                 host->ops = &sdhci_pltfm_ops;
 144         if (pdata)
 145                 host->quirks = pdata->quirks;
 146         host->irq = platform_get_irq(pdev, 0);
 147
 148         if (!request_mem_region(iomem->start, resource_size(iomem),
 149                 mmc_hostname(host->mmc))) {
 150                 dev_err(&pdev->dev, "cannot request region\n");
 151                 ret = -EBUSY;
 152                 goto err_request;
 153         }
 154
 155         host->ioaddr = ioremap(iomem->start, resource_size(iomem));
 156         if (!host->ioaddr) {
 157                 dev_err(&pdev->dev, "failed to remap registers\n");
 158                 ret = -ENOMEM;
 159                 goto err_remap;
 160         }
 161
 162         /*
 163          * Some platforms need to probe the controller to be able to
 164          * determine which caps should be used.
 165          */
 166         if (host->ops && host->ops->platform_init)
 167                 host->ops->platform_init(host);
 168
 169         platform_set_drvdata(pdev, host);
 170
 171         return host;
 172
 173 err_remap:
 174         release_mem_region(iomem->start, resource_size(iomem));
 175 err_request:
 176         sdhci_free_host(host);
 177 err:
 178         dev_err(&pdev->dev, "%s failed %d\n", __func__, ret);
 179         return ERR_PTR(ret);
 180 }
 181 EXPORT_SYMBOL_GPL(sdhci_pltfm_init);
 182
 183 void sdhci_pltfm_free(struct platform_device *pdev)
 184 {
 185         struct sdhci_host *host = platform_get_drvdata(pdev);
 186         struct resource *iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 187
 188         iounmap(host->ioaddr);
 189         release_mem_region(iomem->start, resource_size(iomem));
 190         sdhci_free_host(host);
 191         platform_set_drvdata(pdev, NULL);
 192 }
 193 EXPORT_SYMBOL_GPL(sdhci_pltfm_free);
 194
 195 int sdhci_pltfm_register(struct platform_device *pdev,
 196                          struct sdhci_pltfm_data *pdata)
 197 {
 198         struct sdhci_host *host;
 199         int ret = 0;
 200
 201         host = sdhci_pltfm_init(pdev, pdata);
 202         if (IS_ERR(host))
 203                 return PTR_ERR(host);
 204
 205         sdhci_get_of_property(pdev);
 206
 207         ret = sdhci_add_host(host);
 208         if (ret)
 209                 sdhci_pltfm_free(pdev);
 210
 211         return ret;
 212 }
 213 EXPORT_SYMBOL_GPL(sdhci_pltfm_register);
 214
 215 int sdhci_pltfm_unregister(struct platform_device *pdev)
 216 {
 217         struct sdhci_host *host = platform_get_drvdata(pdev);
 218         int dead = (readl(host->ioaddr + SDHCI_INT_STATUS) == 0xffffffff);
 219
 220         sdhci_remove_host(host, dead);
 221         sdhci_pltfm_free(pdev);
 222
 223         return 0;
 224 }
 225 EXPORT_SYMBOL_GPL(sdhci_pltfm_unregister);
 226
 227 #ifdef CONFIG_PM
 228 static int sdhci_pltfm_suspend(struct device *dev)
 229 {
 230         struct sdhci_host *host = dev_get_drvdata(dev);
 231
 232         return sdhci_suspend_host(host);
 233 }
 234
 235 static int sdhci_pltfm_resume(struct device *dev)
 236 {
 237         struct sdhci_host *host = dev_get_drvdata(dev);
 238
 239         return sdhci_resume_host(host);
 240 }
 241
 242 const struct dev_pm_ops sdhci_pltfm_pmops = {
 243         .suspend        = sdhci_pltfm_suspend,
 244         .resume         = sdhci_pltfm_resume,
 245 };
 246 EXPORT_SYMBOL_GPL(sdhci_pltfm_pmops);
 247 #endif  /* CONFIG_PM */
 248
 249 static int __init sdhci_pltfm_drv_init(void)
 250 {
 251         pr_info("sdhci-pltfm: SDHCI platform and OF driver helper\n");
 252
 253         return 0;
 254 }
 255 module_init(sdhci_pltfm_drv_init);
 256
 257 static void __exit sdhci_pltfm_drv_exit(void)
 258 {
 259 }
 260 module_exit(sdhci_pltfm_drv_exit);
 261
 262 MODULE_DESCRIPTION("SDHCI platform and OF driver helper");
 263 MODULE_AUTHOR("Intel Corporation");
 264 MODULE_LICENSE("GPL v2");