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         .set_clock = sdhci_set_clock,
  49         .set_bus_width = sdhci_set_bus_width,
  50         .reset = sdhci_reset,
  51         .set_uhs_signaling = sdhci_set_uhs_signaling,
  52 };
  53
  54 #ifdef CONFIG_OF
  55 static bool sdhci_of_wp_inverted(struct device_node *np)
  56 {
  57         if (of_get_property(np, "sdhci,wp-inverted", NULL) ||
  58             of_get_property(np, "wp-inverted", NULL))
  59                 return true;
  60
  61         /* Old device trees don't have the wp-inverted property. */
  62 #ifdef CONFIG_PPC
  63         return machine_is(mpc837x_rdb) || machine_is(mpc837x_mds);
  64 #else
  65         return false;
  66 #endif /* CONFIG_PPC */
  67 }
  68
  69 void sdhci_get_of_property(struct platform_device *pdev)
  70 {
  71         struct device_node *np = pdev->dev.of_node;
  72         struct sdhci_host *host = platform_get_drvdata(pdev);
  73         struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
  74         u32 bus_width;
  75
  76         if (of_get_property(np, "sdhci,auto-cmd12", NULL))
  77                 host->quirks |= SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12;
  78
  79         if (of_get_property(np, "sdhci,1-bit-only", NULL) ||
  80             (of_property_read_u32(np, "bus-width", &bus_width) == 0 &&
  81             bus_width == 1))
  82                 host->quirks |= SDHCI_QUIRK_FORCE_1_BIT_DATA;
  83
  84         if (sdhci_of_wp_inverted(np))
  85                 host->quirks |= SDHCI_QUIRK_INVERTED_WRITE_PROTECT;
  86
  87         if (of_get_property(np, "broken-cd", NULL))
  88                 host->quirks |= SDHCI_QUIRK_BROKEN_CARD_DETECTION;
  89
  90         if (of_get_property(np, "no-1-8-v", NULL))
  91                 host->quirks2 |= SDHCI_QUIRK2_NO_1_8_V;
  92
  93         if (of_device_is_compatible(np, "fsl,p2020-rev1-esdhc"))
  94                 host->quirks |= SDHCI_QUIRK_BROKEN_DMA;
  95
  96         if (of_device_is_compatible(np, "fsl,p2020-esdhc") ||
  97             of_device_is_compatible(np, "fsl,p1010-esdhc") ||
  98             of_device_is_compatible(np, "fsl,t4240-esdhc") ||
  99             of_device_is_compatible(np, "fsl,mpc8536-esdhc"))
 100                 host->quirks |= SDHCI_QUIRK_BROKEN_TIMEOUT_VAL;
 101
 102         of_property_read_u32(np, "clock-frequency", &pltfm_host->clock);
 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_property_read_bool(np, "wakeup-source") ||
 108             of_property_read_bool(np, "enable-sdio-wakeup")) /* legacy */
 109                 host->mmc->pm_caps |= MMC_PM_WAKE_SDIO_IRQ;
 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                                     const struct sdhci_pltfm_data *pdata,
 118                                     size_t priv_size)
 119 {
 120         struct sdhci_host *host;
 121         struct resource *iomem;
 122         int ret;
 123
 124         iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 125         if (!iomem) {
 126                 ret = -ENOMEM;
 127                 goto err;
 128         }
 129
 130         if (resource_size(iomem) < 0x100)
 131                 dev_err(&pdev->dev, "Invalid iomem size!\n");
 132
 133         host = sdhci_alloc_host(&pdev->dev,
 134                 sizeof(struct sdhci_pltfm_host) + priv_size);
 135
 136         if (IS_ERR(host)) {
 137                 ret = PTR_ERR(host);
 138                 goto err;
 139         }
 140
 141         host->hw_name = dev_name(&pdev->dev);
 142         if (pdata && pdata->ops)
 143                 host->ops = pdata->ops;
 144         else
 145                 host->ops = &sdhci_pltfm_ops;
 146         if (pdata) {
 147                 host->quirks = pdata->quirks;
 148                 host->quirks2 = pdata->quirks2;
 149         }
 150
 151         host->irq = platform_get_irq(pdev, 0);
 152
 153         if (!request_mem_region(iomem->start, resource_size(iomem),
 154                 mmc_hostname(host->mmc))) {
 155                 dev_err(&pdev->dev, "cannot request region\n");
 156                 ret = -EBUSY;
 157                 goto err_request;
 158         }
 159
 160         host->ioaddr = ioremap(iomem->start, resource_size(iomem));
 161         if (!host->ioaddr) {
 162                 dev_err(&pdev->dev, "failed to remap registers\n");
 163                 ret = -ENOMEM;
 164                 goto err_remap;
 165         }
 166
 167         /*
 168          * Some platforms need to probe the controller to be able to
 169          * determine which caps should be used.
 170          */
 171         if (host->ops && host->ops->platform_init)
 172                 host->ops->platform_init(host);
 173
 174         platform_set_drvdata(pdev, host);
 175
 176         return host;
 177
 178 err_remap:
 179         release_mem_region(iomem->start, resource_size(iomem));
 180 err_request:
 181         sdhci_free_host(host);
 182 err:
 183         dev_err(&pdev->dev, "%s failed %d\n", __func__, ret);
 184         return ERR_PTR(ret);
 185 }
 186 EXPORT_SYMBOL_GPL(sdhci_pltfm_init);
 187
 188 void sdhci_pltfm_free(struct platform_device *pdev)
 189 {
 190         struct sdhci_host *host = platform_get_drvdata(pdev);
 191         struct resource *iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 192
 193         iounmap(host->ioaddr);
 194         release_mem_region(iomem->start, resource_size(iomem));
 195         sdhci_free_host(host);
 196 }
 197 EXPORT_SYMBOL_GPL(sdhci_pltfm_free);
 198
 199 int sdhci_pltfm_register(struct platform_device *pdev,
 200                         const struct sdhci_pltfm_data *pdata,
 201                         size_t priv_size)
 202 {
 203         struct sdhci_host *host;
 204         int ret = 0;
 205
 206         host = sdhci_pltfm_init(pdev, pdata, priv_size);
 207         if (IS_ERR(host))
 208                 return PTR_ERR(host);
 209
 210         sdhci_get_of_property(pdev);
 211
 212         ret = sdhci_add_host(host);
 213         if (ret)
 214                 sdhci_pltfm_free(pdev);
 215
 216         return ret;
 217 }
 218 EXPORT_SYMBOL_GPL(sdhci_pltfm_register);
 219
 220 int sdhci_pltfm_unregister(struct platform_device *pdev)
 221 {
 222         struct sdhci_host *host = platform_get_drvdata(pdev);
 223         struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
 224         int dead = (readl(host->ioaddr + SDHCI_INT_STATUS) == 0xffffffff);
 225
 226         sdhci_remove_host(host, dead);
 227         clk_disable_unprepare(pltfm_host->clk);
 228         sdhci_pltfm_free(pdev);
 229
 230         return 0;
 231 }
 232 EXPORT_SYMBOL_GPL(sdhci_pltfm_unregister);
 233
 234 #ifdef CONFIG_PM
 235 int sdhci_pltfm_suspend(struct device *dev)
 236 {
 237         struct sdhci_host *host = dev_get_drvdata(dev);
 238
 239         return sdhci_suspend_host(host);
 240 }
 241 EXPORT_SYMBOL_GPL(sdhci_pltfm_suspend);
 242
 243 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 EXPORT_SYMBOL_GPL(sdhci_pltfm_resume);
 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");