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         void __iomem *ioaddr;
 123         int irq, ret;
 124
 125         iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 126         ioaddr = devm_ioremap_resource(&pdev->dev, iomem);
 127         if (IS_ERR(ioaddr)) {
 128                 ret = PTR_ERR(ioaddr);
 129                 goto err;
 130         }
 131
 132         irq = platform_get_irq(pdev, 0);
 133         if (irq < 0) {
 134                 dev_err(&pdev->dev, "failed to get IRQ number\n");
 135                 ret = irq;
 136                 goto err;
 137         }
 138
 139         host = sdhci_alloc_host(&pdev->dev,
 140                 sizeof(struct sdhci_pltfm_host) + priv_size);
 141
 142         if (IS_ERR(host)) {
 143                 ret = PTR_ERR(host);
 144                 goto err;
 145         }
 146
 147         host->ioaddr = ioaddr;
 148         host->irq = irq;
 149         host->hw_name = dev_name(&pdev->dev);
 150         if (pdata && pdata->ops)
 151                 host->ops = pdata->ops;
 152         else
 153                 host->ops = &sdhci_pltfm_ops;
 154         if (pdata) {
 155                 host->quirks = pdata->quirks;
 156                 host->quirks2 = pdata->quirks2;
 157         }
 158
 159         platform_set_drvdata(pdev, host);
 160
 161         return host;
 162 err:
 163         dev_err(&pdev->dev, "%s failed %d\n", __func__, ret);
 164         return ERR_PTR(ret);
 165 }
 166 EXPORT_SYMBOL_GPL(sdhci_pltfm_init);
 167
 168 void sdhci_pltfm_free(struct platform_device *pdev)
 169 {
 170         struct sdhci_host *host = platform_get_drvdata(pdev);
 171
 172         sdhci_free_host(host);
 173 }
 174 EXPORT_SYMBOL_GPL(sdhci_pltfm_free);
 175
 176 int sdhci_pltfm_register(struct platform_device *pdev,
 177                         const struct sdhci_pltfm_data *pdata,
 178                         size_t priv_size)
 179 {
 180         struct sdhci_host *host;
 181         int ret = 0;
 182
 183         host = sdhci_pltfm_init(pdev, pdata, priv_size);
 184         if (IS_ERR(host))
 185                 return PTR_ERR(host);
 186
 187         sdhci_get_of_property(pdev);
 188
 189         ret = sdhci_add_host(host);
 190         if (ret)
 191                 sdhci_pltfm_free(pdev);
 192
 193         return ret;
 194 }
 195 EXPORT_SYMBOL_GPL(sdhci_pltfm_register);
 196
 197 int sdhci_pltfm_unregister(struct platform_device *pdev)
 198 {
 199         struct sdhci_host *host = platform_get_drvdata(pdev);
 200         struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
 201         int dead = (readl(host->ioaddr + SDHCI_INT_STATUS) == 0xffffffff);
 202
 203         sdhci_remove_host(host, dead);
 204         clk_disable_unprepare(pltfm_host->clk);
 205         sdhci_pltfm_free(pdev);
 206
 207         return 0;
 208 }
 209 EXPORT_SYMBOL_GPL(sdhci_pltfm_unregister);
 210
 211 #ifdef CONFIG_PM_SLEEP
 212 int sdhci_pltfm_suspend(struct device *dev)
 213 {
 214         struct sdhci_host *host = dev_get_drvdata(dev);
 215         struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
 216         int ret;
 217
 218         if (host->tuning_mode != SDHCI_TUNING_MODE_3)
 219                 mmc_retune_needed(host->mmc);
 220
 221         ret = sdhci_suspend_host(host);
 222         if (ret)
 223                 return ret;
 224
 225         clk_disable_unprepare(pltfm_host->clk);
 226
 227         return 0;
 228 }
 229 EXPORT_SYMBOL_GPL(sdhci_pltfm_suspend);
 230
 231 int sdhci_pltfm_resume(struct device *dev)
 232 {
 233         struct sdhci_host *host = dev_get_drvdata(dev);
 234         struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
 235         int ret;
 236
 237         ret = clk_prepare_enable(pltfm_host->clk);
 238         if (ret)
 239                 return ret;
 240
 241         ret = sdhci_resume_host(host);
 242         if (ret)
 243                 clk_disable_unprepare(pltfm_host->clk);
 244
 245         return ret;
 246 }
 247 EXPORT_SYMBOL_GPL(sdhci_pltfm_resume);
 248 #endif
 249
 250 const struct dev_pm_ops sdhci_pltfm_pmops = {
 251         SET_SYSTEM_SLEEP_PM_OPS(sdhci_pltfm_suspend, sdhci_pltfm_resume)
 252 };
 253 EXPORT_SYMBOL_GPL(sdhci_pltfm_pmops);
 254
 255 static int __init sdhci_pltfm_drv_init(void)
 256 {
 257         pr_info("sdhci-pltfm: SDHCI platform and OF driver helper\n");
 258
 259         return 0;
 260 }
 261 module_init(sdhci_pltfm_drv_init);
 262
 263 static void __exit sdhci_pltfm_drv_exit(void)
 264 {
 265 }
 266 module_exit(sdhci_pltfm_drv_exit);
 267
 268 MODULE_DESCRIPTION("SDHCI platform and OF driver helper");
 269 MODULE_AUTHOR("Intel Corporation");
 270 MODULE_LICENSE("GPL v2");