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 unsigned int sdhci_pltfm_clk_get_max_clock(struct sdhci_host *host)
  40 {
  41         struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
  42
  43         return clk_get_rate(pltfm_host->clk);
  44 }
  45 EXPORT_SYMBOL_GPL(sdhci_pltfm_clk_get_max_clock);
  46
  47 static const struct sdhci_ops sdhci_pltfm_ops = {
  48 };
  49
  50 #ifdef CONFIG_OF
  51 static bool sdhci_of_wp_inverted(struct device_node *np)
  52 {
  53         if (of_get_property(np, "sdhci,wp-inverted", NULL) ||
  54             of_get_property(np, "wp-inverted", NULL))
  55                 return true;
  56
  57         /* Old device trees don't have the wp-inverted property. */
  58 #ifdef CONFIG_PPC
  59         return machine_is(mpc837x_rdb) || machine_is(mpc837x_mds);
  60 #else
  61         return false;
  62 #endif /* CONFIG_PPC */
  63 }
  64
  65 void sdhci_get_of_property(struct platform_device *pdev)
  66 {
  67         struct device_node *np = pdev->dev.of_node;
  68         struct sdhci_host *host = platform_get_drvdata(pdev);
  69         struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
  70         const __be32 *clk;
  71         u32 bus_width;
  72         int size;
  73
  74         if (of_device_is_available(np)) {
  75                 if (of_get_property(np, "sdhci,auto-cmd12", NULL))
  76                         host->quirks |= SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12;
  77
  78                 if (of_get_property(np, "sdhci,1-bit-only", NULL) ||
  79                     (of_property_read_u32(np, "bus-width", &bus_width) == 0 &&
  80                     bus_width == 1))
  81                         host->quirks |= SDHCI_QUIRK_FORCE_1_BIT_DATA;
  82
  83                 if (sdhci_of_wp_inverted(np))
  84                         host->quirks |= SDHCI_QUIRK_INVERTED_WRITE_PROTECT;
  85
  86                 if (of_get_property(np, "broken-cd", NULL))
  87                         host->quirks |= SDHCI_QUIRK_BROKEN_CARD_DETECTION;
  88
  89                 if (of_get_property(np, "no-1-8-v", NULL))
  90                         host->quirks2 |= SDHCI_QUIRK2_NO_1_8_V;
  91
  92                 if (of_device_is_compatible(np, "fsl,p2020-rev1-esdhc"))
  93                         host->quirks |= SDHCI_QUIRK_BROKEN_DMA;
  94
  95                 if (of_device_is_compatible(np, "fsl,p2020-esdhc") ||
  96                     of_device_is_compatible(np, "fsl,p1010-esdhc") ||
  97                     of_device_is_compatible(np, "fsl,t4240-esdhc") ||
  98                     of_device_is_compatible(np, "fsl,mpc8536-esdhc"))
  99                         host->quirks |= SDHCI_QUIRK_BROKEN_TIMEOUT_VAL;
 100
 101                 clk = of_get_property(np, "clock-frequency", &size);
 102                 if (clk && size == sizeof(*clk) && *clk)
 103                         pltfm_host->clock = be32_to_cpup(clk);
 104
 105                 if (of_find_property(np, "keep-power-in-suspend", NULL))
 106                         host->mmc->pm_caps |= MMC_PM_KEEP_POWER;
 107
 108                 if (of_find_property(np, "enable-sdio-wakeup", NULL))
 109                         host->mmc->pm_caps |= MMC_PM_WAKE_SDIO_IRQ;
 110         }
 111 }
 112 #else
 113 void sdhci_get_of_property(struct platform_device *pdev) {}
 114 #endif /* CONFIG_OF */
 115 EXPORT_SYMBOL_GPL(sdhci_get_of_property);
 116
 117 struct sdhci_host *sdhci_pltfm_init(struct platform_device *pdev,
 118                                     const struct sdhci_pltfm_data *pdata)
 119 {
 120         struct sdhci_host *host;
 121         struct sdhci_pltfm_host *pltfm_host;
 122         struct device_node *np = pdev->dev.of_node;
 123         struct resource *iomem;
 124         int ret;
 125
 126         iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 127         if (!iomem) {
 128                 ret = -ENOMEM;
 129                 goto err;
 130         }
 131
 132         if (resource_size(iomem) < 0x100)
 133                 dev_err(&pdev->dev, "Invalid iomem size!\n");
 134
 135         /* Some PCI-based MFD need the parent here */
 136         if (pdev->dev.parent != &platform_bus && !np)
 137                 host = sdhci_alloc_host(pdev->dev.parent, sizeof(*pltfm_host));
 138         else
 139                 host = sdhci_alloc_host(&pdev->dev, sizeof(*pltfm_host));
 140
 141         if (IS_ERR(host)) {
 142                 ret = PTR_ERR(host);
 143                 goto err;
 144         }
 145
 146         pltfm_host = sdhci_priv(host);
 147
 148         host->hw_name = dev_name(&pdev->dev);
 149         if (pdata && pdata->ops)
 150                 host->ops = pdata->ops;
 151         else
 152                 host->ops = &sdhci_pltfm_ops;
 153         if (pdata)
 154                 host->quirks = pdata->quirks;
 155         host->irq = platform_get_irq(pdev, 0);
 156
 157         if (!request_mem_region(iomem->start, resource_size(iomem),
 158                 mmc_hostname(host->mmc))) {
 159                 dev_err(&pdev->dev, "cannot request region\n");
 160                 ret = -EBUSY;
 161                 goto err_request;
 162         }
 163
 164         host->ioaddr = ioremap(iomem->start, resource_size(iomem));
 165         if (!host->ioaddr) {
 166                 dev_err(&pdev->dev, "failed to remap registers\n");
 167                 ret = -ENOMEM;
 168                 goto err_remap;
 169         }
 170
 171         /*
 172          * Some platforms need to probe the controller to be able to
 173          * determine which caps should be used.
 174          */
 175         if (host->ops && host->ops->platform_init)
 176                 host->ops->platform_init(host);
 177
 178         platform_set_drvdata(pdev, host);
 179
 180         return host;
 181
 182 err_remap:
 183         release_mem_region(iomem->start, resource_size(iomem));
 184 err_request:
 185         sdhci_free_host(host);
 186 err:
 187         dev_err(&pdev->dev, "%s failed %d\n", __func__, ret);
 188         return ERR_PTR(ret);
 189 }
 190 EXPORT_SYMBOL_GPL(sdhci_pltfm_init);
 191
 192 void sdhci_pltfm_free(struct platform_device *pdev)
 193 {
 194         struct sdhci_host *host = platform_get_drvdata(pdev);
 195         struct resource *iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 196
 197         iounmap(host->ioaddr);
 198         release_mem_region(iomem->start, resource_size(iomem));
 199         sdhci_free_host(host);
 200         platform_set_drvdata(pdev, NULL);
 201 }
 202 EXPORT_SYMBOL_GPL(sdhci_pltfm_free);
 203
 204 int sdhci_pltfm_register(struct platform_device *pdev,
 205                          const struct sdhci_pltfm_data *pdata)
 206 {
 207         struct sdhci_host *host;
 208         int ret = 0;
 209
 210         host = sdhci_pltfm_init(pdev, pdata);
 211         if (IS_ERR(host))
 212                 return PTR_ERR(host);
 213
 214         sdhci_get_of_property(pdev);
 215
 216         ret = sdhci_add_host(host);
 217         if (ret)
 218                 sdhci_pltfm_free(pdev);
 219
 220         return ret;
 221 }
 222 EXPORT_SYMBOL_GPL(sdhci_pltfm_register);
 223
 224 int sdhci_pltfm_unregister(struct platform_device *pdev)
 225 {
 226         struct sdhci_host *host = platform_get_drvdata(pdev);
 227         int dead = (readl(host->ioaddr + SDHCI_INT_STATUS) == 0xffffffff);
 228
 229         sdhci_remove_host(host, dead);
 230         sdhci_pltfm_free(pdev);
 231
 232         return 0;
 233 }
 234 EXPORT_SYMBOL_GPL(sdhci_pltfm_unregister);
 235
 236 #ifdef CONFIG_PM
 237 static int sdhci_pltfm_suspend(struct device *dev)
 238 {
 239         struct sdhci_host *host = dev_get_drvdata(dev);
 240
 241         return sdhci_suspend_host(host);
 242 }
 243
 244 static int sdhci_pltfm_resume(struct device *dev)
 245 {
 246         struct sdhci_host *host = dev_get_drvdata(dev);
 247
 248         return sdhci_resume_host(host);
 249 }
 250
 251 const struct dev_pm_ops sdhci_pltfm_pmops = {
 252         .suspend        = sdhci_pltfm_suspend,
 253         .resume         = sdhci_pltfm_resume,
 254 };
 255 EXPORT_SYMBOL_GPL(sdhci_pltfm_pmops);
 256 #endif  /* CONFIG_PM */
 257
 258 static int __init sdhci_pltfm_drv_init(void)
 259 {
 260         pr_info("sdhci-pltfm: SDHCI platform and OF driver helper\n");
 261
 262         return 0;
 263 }
 264 module_init(sdhci_pltfm_drv_init);
 265
 266 static void __exit sdhci_pltfm_drv_exit(void)
 267 {
 268 }
 269 module_exit(sdhci_pltfm_drv_exit);
 270
 271 MODULE_DESCRIPTION("SDHCI platform and OF driver helper");
 272 MODULE_AUTHOR("Intel Corporation");
 273 MODULE_LICENSE("GPL v2");