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                                     size_t priv_size)
 120 {
 121         struct sdhci_host *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,
 138                         sizeof(struct sdhci_pltfm_host) + priv_size);
 139         else
 140                 host = sdhci_alloc_host(&pdev->dev,
 141                         sizeof(struct sdhci_pltfm_host) + priv_size);
 142
 143         if (IS_ERR(host)) {
 144                 ret = PTR_ERR(host);
 145                 goto err;
 146         }
 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->quirks2 = pdata->quirks2;
 156         }
 157
 158         host->irq = platform_get_irq(pdev, 0);
 159
 160         if (!request_mem_region(iomem->start, resource_size(iomem),
 161                 mmc_hostname(host->mmc))) {
 162                 dev_err(&pdev->dev, "cannot request region\n");
 163                 ret = -EBUSY;
 164                 goto err_request;
 165         }
 166
 167         host->ioaddr = ioremap(iomem->start, resource_size(iomem));
 168         if (!host->ioaddr) {
 169                 dev_err(&pdev->dev, "failed to remap registers\n");
 170                 ret = -ENOMEM;
 171                 goto err_remap;
 172         }
 173
 174         /*
 175          * Some platforms need to probe the controller to be able to
 176          * determine which caps should be used.
 177          */
 178         if (host->ops && host->ops->platform_init)
 179                 host->ops->platform_init(host);
 180
 181         platform_set_drvdata(pdev, host);
 182
 183         return host;
 184
 185 err_remap:
 186         release_mem_region(iomem->start, resource_size(iomem));
 187 err_request:
 188         sdhci_free_host(host);
 189 err:
 190         dev_err(&pdev->dev, "%s failed %d\n", __func__, ret);
 191         return ERR_PTR(ret);
 192 }
 193 EXPORT_SYMBOL_GPL(sdhci_pltfm_init);
 194
 195 void sdhci_pltfm_free(struct platform_device *pdev)
 196 {
 197         struct sdhci_host *host = platform_get_drvdata(pdev);
 198         struct resource *iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 199
 200         iounmap(host->ioaddr);
 201         release_mem_region(iomem->start, resource_size(iomem));
 202         sdhci_free_host(host);
 203 }
 204 EXPORT_SYMBOL_GPL(sdhci_pltfm_free);
 205
 206 int sdhci_pltfm_register(struct platform_device *pdev,
 207                         const struct sdhci_pltfm_data *pdata,
 208                         size_t priv_size)
 209 {
 210         struct sdhci_host *host;
 211         int ret = 0;
 212
 213         host = sdhci_pltfm_init(pdev, pdata, priv_size);
 214         if (IS_ERR(host))
 215                 return PTR_ERR(host);
 216
 217         sdhci_get_of_property(pdev);
 218
 219         ret = sdhci_add_host(host);
 220         if (ret)
 221                 sdhci_pltfm_free(pdev);
 222
 223         return ret;
 224 }
 225 EXPORT_SYMBOL_GPL(sdhci_pltfm_register);
 226
 227 int sdhci_pltfm_unregister(struct platform_device *pdev)
 228 {
 229         struct sdhci_host *host = platform_get_drvdata(pdev);
 230         int dead = (readl(host->ioaddr + SDHCI_INT_STATUS) == 0xffffffff);
 231
 232         sdhci_remove_host(host, dead);
 233         sdhci_pltfm_free(pdev);
 234
 235         return 0;
 236 }
 237 EXPORT_SYMBOL_GPL(sdhci_pltfm_unregister);
 238
 239 #ifdef CONFIG_PM
 240 static int sdhci_pltfm_suspend(struct device *dev)
 241 {
 242         struct sdhci_host *host = dev_get_drvdata(dev);
 243
 244         return sdhci_suspend_host(host);
 245 }
 246
 247 static int sdhci_pltfm_resume(struct device *dev)
 248 {
 249         struct sdhci_host *host = dev_get_drvdata(dev);
 250
 251         return sdhci_resume_host(host);
 252 }
 253
 254 const struct dev_pm_ops sdhci_pltfm_pmops = {
 255         .suspend        = sdhci_pltfm_suspend,
 256         .resume         = sdhci_pltfm_resume,
 257 };
 258 EXPORT_SYMBOL_GPL(sdhci_pltfm_pmops);
 259 #endif  /* CONFIG_PM */
 260
 261 static int __init sdhci_pltfm_drv_init(void)
 262 {
 263         pr_info("sdhci-pltfm: SDHCI platform and OF driver helper\n");
 264
 265         return 0;
 266 }
 267 module_init(sdhci_pltfm_drv_init);
 268
 269 static void __exit sdhci_pltfm_drv_exit(void)
 270 {
 271 }
 272 module_exit(sdhci_pltfm_drv_exit);
 273
 274 MODULE_DESCRIPTION("SDHCI platform and OF driver helper");
 275 MODULE_AUTHOR("Intel Corporation");
 276 MODULE_LICENSE("GPL v2");