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/property.h>
  34 #include <linux/of.h>
  35 #ifdef CONFIG_PPC
  36 #include <asm/machdep.h>
  37 #endif
  38 #include "sdhci-pltfm.h"
  39
  40 unsigned int sdhci_pltfm_clk_get_max_clock(struct sdhci_host *host)
  41 {
  42         struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
  43
  44         return clk_get_rate(pltfm_host->clk);
  45 }
  46 EXPORT_SYMBOL_GPL(sdhci_pltfm_clk_get_max_clock);
  47
  48 static const struct sdhci_ops sdhci_pltfm_ops = {
  49         .set_clock = sdhci_set_clock,
  50         .set_bus_width = sdhci_set_bus_width,
  51         .reset = sdhci_reset,
  52         .set_uhs_signaling = sdhci_set_uhs_signaling,
  53 };
  54
  55 static bool sdhci_wp_inverted(struct device *dev)
  56 {
  57         if (device_property_present(dev, "sdhci,wp-inverted") ||
  58             device_property_present(dev, "wp-inverted"))
  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 #ifdef CONFIG_OF
  70 static void sdhci_get_compatibility(struct platform_device *pdev)
  71 {
  72         struct sdhci_host *host = platform_get_drvdata(pdev);
  73         struct device_node *np = pdev->dev.of_node;
  74
  75         if (!np)
  76                 return;
  77
  78         if (of_device_is_compatible(np, "fsl,p2020-rev1-esdhc"))
  79                 host->quirks |= SDHCI_QUIRK_BROKEN_DMA;
  80
  81         if (of_device_is_compatible(np, "fsl,p2020-esdhc") ||
  82             of_device_is_compatible(np, "fsl,p1010-esdhc") ||
  83             of_device_is_compatible(np, "fsl,t4240-esdhc") ||
  84             of_device_is_compatible(np, "fsl,mpc8536-esdhc"))
  85                 host->quirks |= SDHCI_QUIRK_BROKEN_TIMEOUT_VAL;
  86 }
  87 #else
  88 void sdhci_get_compatibility(struct platform_device *pdev) {}
  89 #endif /* CONFIG_OF */
  90
  91 void sdhci_get_property(struct platform_device *pdev)
  92 {
  93         struct device *dev = &pdev->dev;
  94         struct sdhci_host *host = platform_get_drvdata(pdev);
  95         struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
  96         u32 bus_width;
  97
  98         if (device_property_present(dev, "sdhci,auto-cmd12"))
  99                 host->quirks |= SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12;
 100
 101         if (device_property_present(dev, "sdhci,1-bit-only") ||
 102             (device_property_read_u32(dev, "bus-width", &bus_width) == 0 &&
 103             bus_width == 1))
 104                 host->quirks |= SDHCI_QUIRK_FORCE_1_BIT_DATA;
 105
 106         if (sdhci_wp_inverted(dev))
 107                 host->quirks |= SDHCI_QUIRK_INVERTED_WRITE_PROTECT;
 108
 109         if (device_property_present(dev, "broken-cd"))
 110                 host->quirks |= SDHCI_QUIRK_BROKEN_CARD_DETECTION;
 111
 112         if (device_property_present(dev, "no-1-8-v"))
 113                 host->quirks2 |= SDHCI_QUIRK2_NO_1_8_V;
 114
 115         sdhci_get_compatibility(pdev);
 116
 117         device_property_read_u32(dev, "clock-frequency", &pltfm_host->clock);
 118
 119         if (device_property_present(dev, "keep-power-in-suspend"))
 120                 host->mmc->pm_caps |= MMC_PM_KEEP_POWER;
 121
 122         if (device_property_read_bool(dev, "wakeup-source") ||
 123             device_property_read_bool(dev, "enable-sdio-wakeup")) /* legacy */
 124                 host->mmc->pm_caps |= MMC_PM_WAKE_SDIO_IRQ;
 125 }
 126 EXPORT_SYMBOL_GPL(sdhci_get_property);
 127
 128 struct sdhci_host *sdhci_pltfm_init(struct platform_device *pdev,
 129                                     const struct sdhci_pltfm_data *pdata,
 130                                     size_t priv_size)
 131 {
 132         struct sdhci_host *host;
 133         struct resource *iomem;
 134         void __iomem *ioaddr;
 135         int irq, ret;
 136
 137         iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 138         ioaddr = devm_ioremap_resource(&pdev->dev, iomem);
 139         if (IS_ERR(ioaddr)) {
 140                 ret = PTR_ERR(ioaddr);
 141                 goto err;
 142         }
 143
 144         irq = platform_get_irq(pdev, 0);
 145         if (irq < 0) {
 146                 dev_err(&pdev->dev, "failed to get IRQ number\n");
 147                 ret = irq;
 148                 goto err;
 149         }
 150
 151         host = sdhci_alloc_host(&pdev->dev,
 152                 sizeof(struct sdhci_pltfm_host) + priv_size);
 153
 154         if (IS_ERR(host)) {
 155                 ret = PTR_ERR(host);
 156                 goto err;
 157         }
 158
 159         host->ioaddr = ioaddr;
 160         host->irq = irq;
 161         host->hw_name = dev_name(&pdev->dev);
 162         if (pdata && pdata->ops)
 163                 host->ops = pdata->ops;
 164         else
 165                 host->ops = &sdhci_pltfm_ops;
 166         if (pdata) {
 167                 host->quirks = pdata->quirks;
 168                 host->quirks2 = pdata->quirks2;
 169         }
 170
 171         platform_set_drvdata(pdev, host);
 172
 173         return host;
 174 err:
 175         dev_err(&pdev->dev, "%s failed %d\n", __func__, ret);
 176         return ERR_PTR(ret);
 177 }
 178 EXPORT_SYMBOL_GPL(sdhci_pltfm_init);
 179
 180 void sdhci_pltfm_free(struct platform_device *pdev)
 181 {
 182         struct sdhci_host *host = platform_get_drvdata(pdev);
 183
 184         sdhci_free_host(host);
 185 }
 186 EXPORT_SYMBOL_GPL(sdhci_pltfm_free);
 187
 188 int sdhci_pltfm_register(struct platform_device *pdev,
 189                         const struct sdhci_pltfm_data *pdata,
 190                         size_t priv_size)
 191 {
 192         struct sdhci_host *host;
 193         int ret = 0;
 194
 195         host = sdhci_pltfm_init(pdev, pdata, priv_size);
 196         if (IS_ERR(host))
 197                 return PTR_ERR(host);
 198
 199         sdhci_get_property(pdev);
 200
 201         ret = sdhci_add_host(host);
 202         if (ret)
 203                 sdhci_pltfm_free(pdev);
 204
 205         return ret;
 206 }
 207 EXPORT_SYMBOL_GPL(sdhci_pltfm_register);
 208
 209 int sdhci_pltfm_unregister(struct platform_device *pdev)
 210 {
 211         struct sdhci_host *host = platform_get_drvdata(pdev);
 212         struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
 213         int dead = (readl(host->ioaddr + SDHCI_INT_STATUS) == 0xffffffff);
 214
 215         sdhci_remove_host(host, dead);
 216         clk_disable_unprepare(pltfm_host->clk);
 217         sdhci_pltfm_free(pdev);
 218
 219         return 0;
 220 }
 221 EXPORT_SYMBOL_GPL(sdhci_pltfm_unregister);
 222
 223 #ifdef CONFIG_PM_SLEEP
 224 int sdhci_pltfm_suspend(struct device *dev)
 225 {
 226         struct sdhci_host *host = dev_get_drvdata(dev);
 227         struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
 228         int ret;
 229
 230         if (host->tuning_mode != SDHCI_TUNING_MODE_3)
 231                 mmc_retune_needed(host->mmc);
 232
 233         ret = sdhci_suspend_host(host);
 234         if (ret)
 235                 return ret;
 236
 237         clk_disable_unprepare(pltfm_host->clk);
 238
 239         return 0;
 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         struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
 247         int ret;
 248
 249         ret = clk_prepare_enable(pltfm_host->clk);
 250         if (ret)
 251                 return ret;
 252
 253         ret = sdhci_resume_host(host);
 254         if (ret)
 255                 clk_disable_unprepare(pltfm_host->clk);
 256
 257         return ret;
 258 }
 259 EXPORT_SYMBOL_GPL(sdhci_pltfm_resume);
 260 #endif
 261
 262 const struct dev_pm_ops sdhci_pltfm_pmops = {
 263         SET_SYSTEM_SLEEP_PM_OPS(sdhci_pltfm_suspend, sdhci_pltfm_resume)
 264 };
 265 EXPORT_SYMBOL_GPL(sdhci_pltfm_pmops);
 266
 267 static int __init sdhci_pltfm_drv_init(void)
 268 {
 269         pr_info("sdhci-pltfm: SDHCI platform and OF driver helper\n");
 270
 271         return 0;
 272 }
 273 module_init(sdhci_pltfm_drv_init);
 274
 275 static void __exit sdhci_pltfm_drv_exit(void)
 276 {
 277 }
 278 module_exit(sdhci_pltfm_drv_exit);
 279
 280 MODULE_DESCRIPTION("SDHCI platform and OF driver helper");
 281 MODULE_AUTHOR("Intel Corporation");
 282 MODULE_LICENSE("GPL v2");