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 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,mpc8536-esdhc"))
  98                         host->quirks |= SDHCI_QUIRK_BROKEN_TIMEOUT_VAL;
  99
 100                 clk = of_get_property(np, "clock-frequency", &size);
 101                 if (clk && size == sizeof(*clk) && *clk)
 102                         pltfm_host->clock = be32_to_cpup(clk);
 103
 104                 if (of_find_property(np, "keep-power-in-suspend", NULL))
 105                         host->mmc->pm_caps |= MMC_PM_KEEP_POWER;
 106
 107                 if (of_find_property(np, "enable-sdio-wakeup", NULL))
 108                         host->mmc->pm_caps |= MMC_PM_WAKE_SDIO_IRQ;
 109         }
 110 }
 111 #else
 112 void sdhci_get_of_property(struct platform_device *pdev) {}
 113 #endif /* CONFIG_OF */
 114 EXPORT_SYMBOL_GPL(sdhci_get_of_property);
 115
 116 struct sdhci_host *sdhci_pltfm_init(struct platform_device *pdev,
 117                                     struct sdhci_pltfm_data *pdata)
 118 {
 119         struct sdhci_host *host;
 120         struct sdhci_pltfm_host *pltfm_host;
 121         struct device_node *np = pdev->dev.of_node;
 122         struct resource *iomem;
 123         int ret;
 124
 125         iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 126         if (!iomem) {
 127                 ret = -ENOMEM;
 128                 goto err;
 129         }
 130
 131         if (resource_size(iomem) < 0x100)
 132                 dev_err(&pdev->dev, "Invalid iomem size!\n");
 133
 134         /* Some PCI-based MFD need the parent here */
 135         if (pdev->dev.parent != &platform_bus && !np)
 136                 host = sdhci_alloc_host(pdev->dev.parent, sizeof(*pltfm_host));
 137         else
 138                 host = sdhci_alloc_host(&pdev->dev, sizeof(*pltfm_host));
 139
 140         if (IS_ERR(host)) {
 141                 ret = PTR_ERR(host);
 142                 goto err;
 143         }
 144
 145         pltfm_host = sdhci_priv(host);
 146
 147         host->hw_name = dev_name(&pdev->dev);
 148         if (pdata && pdata->ops)
 149                 host->ops = pdata->ops;
 150         else
 151                 host->ops = &sdhci_pltfm_ops;
 152         if (pdata)
 153                 host->quirks = pdata->quirks;
 154         host->irq = platform_get_irq(pdev, 0);
 155
 156         if (!request_mem_region(iomem->start, resource_size(iomem),
 157                 mmc_hostname(host->mmc))) {
 158                 dev_err(&pdev->dev, "cannot request region\n");
 159                 ret = -EBUSY;
 160                 goto err_request;
 161         }
 162
 163         host->ioaddr = ioremap(iomem->start, resource_size(iomem));
 164         if (!host->ioaddr) {
 165                 dev_err(&pdev->dev, "failed to remap registers\n");
 166                 ret = -ENOMEM;
 167                 goto err_remap;
 168         }
 169
 170         /*
 171          * Some platforms need to probe the controller to be able to
 172          * determine which caps should be used.
 173          */
 174         if (host->ops && host->ops->platform_init)
 175                 host->ops->platform_init(host);
 176
 177         platform_set_drvdata(pdev, host);
 178
 179         return host;
 180
 181 err_remap:
 182         release_mem_region(iomem->start, resource_size(iomem));
 183 err_request:
 184         sdhci_free_host(host);
 185 err:
 186         dev_err(&pdev->dev, "%s failed %d\n", __func__, ret);
 187         return ERR_PTR(ret);
 188 }
 189 EXPORT_SYMBOL_GPL(sdhci_pltfm_init);
 190
 191 void sdhci_pltfm_free(struct platform_device *pdev)
 192 {
 193         struct sdhci_host *host = platform_get_drvdata(pdev);
 194         struct resource *iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 195
 196         iounmap(host->ioaddr);
 197         release_mem_region(iomem->start, resource_size(iomem));
 198         sdhci_free_host(host);
 199         platform_set_drvdata(pdev, NULL);
 200 }
 201 EXPORT_SYMBOL_GPL(sdhci_pltfm_free);
 202
 203 int sdhci_pltfm_register(struct platform_device *pdev,
 204                          struct sdhci_pltfm_data *pdata)
 205 {
 206         struct sdhci_host *host;
 207         int ret = 0;
 208
 209         host = sdhci_pltfm_init(pdev, pdata);
 210         if (IS_ERR(host))
 211                 return PTR_ERR(host);
 212
 213         sdhci_get_of_property(pdev);
 214
 215         ret = sdhci_add_host(host);
 216         if (ret)
 217                 sdhci_pltfm_free(pdev);
 218
 219         return ret;
 220 }
 221 EXPORT_SYMBOL_GPL(sdhci_pltfm_register);
 222
 223 int sdhci_pltfm_unregister(struct platform_device *pdev)
 224 {
 225         struct sdhci_host *host = platform_get_drvdata(pdev);
 226         int dead = (readl(host->ioaddr + SDHCI_INT_STATUS) == 0xffffffff);
 227
 228         sdhci_remove_host(host, dead);
 229         sdhci_pltfm_free(pdev);
 230
 231         return 0;
 232 }
 233 EXPORT_SYMBOL_GPL(sdhci_pltfm_unregister);
 234
 235 #ifdef CONFIG_PM
 236 static int sdhci_pltfm_suspend(struct device *dev)
 237 {
 238         struct sdhci_host *host = dev_get_drvdata(dev);
 239
 240         return sdhci_suspend_host(host);
 241 }
 242
 243 static int sdhci_pltfm_resume(struct device *dev)
 244 {
 245         struct sdhci_host *host = dev_get_drvdata(dev);
 246
 247         return sdhci_resume_host(host);
 248 }
 249
 250 const struct dev_pm_ops sdhci_pltfm_pmops = {
 251         .suspend        = sdhci_pltfm_suspend,
 252         .resume         = sdhci_pltfm_resume,
 253 };
 254 EXPORT_SYMBOL_GPL(sdhci_pltfm_pmops);
 255 #endif  /* CONFIG_PM */
 256
 257 static int __init sdhci_pltfm_drv_init(void)
 258 {
 259         pr_info("sdhci-pltfm: SDHCI platform and OF driver helper\n");
 260
 261         return 0;
 262 }
 263 module_init(sdhci_pltfm_drv_init);
 264
 265 static void __exit sdhci_pltfm_drv_exit(void)
 266 {
 267 }
 268 module_exit(sdhci_pltfm_drv_exit);
 269
 270 MODULE_DESCRIPTION("SDHCI platform and OF driver helper");
 271 MODULE_AUTHOR("Intel Corporation");
 272 MODULE_LICENSE("GPL v2");