drivers/mmc/host/sdhci-acpi.c

   1 /*
   2  * Secure Digital Host Controller Interface ACPI driver.
   3  *
   4  * Copyright (c) 2012, Intel Corporation.
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms and conditions of the GNU General Public License,
   8  * version 2, as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope it will be useful, but WITHOUT
  11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  13  * more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along with
  16  * this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  */
  20
  21 #include <linux/init.h>
  22 #include <linux/export.h>
  23 #include <linux/module.h>
  24 #include <linux/device.h>
  25 #include <linux/platform_device.h>
  26 #include <linux/ioport.h>
  27 #include <linux/io.h>
  28 #include <linux/dma-mapping.h>
  29 #include <linux/compiler.h>
  30 #include <linux/stddef.h>
  31 #include <linux/bitops.h>
  32 #include <linux/types.h>
  33 #include <linux/err.h>
  34 #include <linux/interrupt.h>
  35 #include <linux/acpi.h>
  36 #include <linux/pm.h>
  37 #include <linux/pm_runtime.h>
  38
  39 #include <linux/mmc/host.h>
  40 #include <linux/mmc/pm.h>
  41 #include <linux/mmc/sdhci.h>
  42
  43 #include "sdhci.h"
  44
  45 enum {
  46         SDHCI_ACPI_SD_CD        = BIT(0),
  47         SDHCI_ACPI_RUNTIME_PM   = BIT(1),
  48 };
  49
  50 struct sdhci_acpi_chip {
  51         const struct    sdhci_ops *ops;
  52         unsigned int    quirks;
  53         unsigned int    quirks2;
  54         unsigned long   caps;
  55         unsigned int    caps2;
  56         mmc_pm_flag_t   pm_caps;
  57 };
  58
  59 struct sdhci_acpi_slot {
  60         const struct    sdhci_acpi_chip *chip;
  61         unsigned int    quirks;
  62         unsigned int    quirks2;
  63         unsigned long   caps;
  64         unsigned int    caps2;
  65         mmc_pm_flag_t   pm_caps;
  66         unsigned int    flags;
  67 };
  68
  69 struct sdhci_acpi_host {
  70         struct sdhci_host               *host;
  71         const struct sdhci_acpi_slot    *slot;
  72         struct platform_device          *pdev;
  73         bool                            use_runtime_pm;
  74 };
  75
  76 static inline bool sdhci_acpi_flag(struct sdhci_acpi_host *c, unsigned int flag)
  77 {
  78         return c->slot && (c->slot->flags & flag);
  79 }
  80
  81 static int sdhci_acpi_enable_dma(struct sdhci_host *host)
  82 {
  83         return 0;
  84 }
  85
  86 static const struct sdhci_ops sdhci_acpi_ops_dflt = {
  87         .enable_dma = sdhci_acpi_enable_dma,
  88 };
  89
  90 static const struct sdhci_acpi_slot sdhci_acpi_slot_int_sdio = {
  91         .quirks2 = SDHCI_QUIRK2_HOST_OFF_CARD_ON,
  92         .caps    = MMC_CAP_NONREMOVABLE | MMC_CAP_POWER_OFF_CARD,
  93         .flags   = SDHCI_ACPI_RUNTIME_PM,
  94         .pm_caps = MMC_PM_KEEP_POWER,
  95 };
  96
  97 static const struct acpi_device_id sdhci_acpi_ids[] = {
  98         { "INT33C6", (kernel_ulong_t)&sdhci_acpi_slot_int_sdio },
  99         { "PNP0D40" },
 100         { },
 101 };
 102 MODULE_DEVICE_TABLE(acpi, sdhci_acpi_ids);
 103
 104 static const struct sdhci_acpi_slot *sdhci_acpi_get_slot(const char *hid)
 105 {
 106         const struct acpi_device_id *id;
 107
 108         for (id = sdhci_acpi_ids; id->id[0]; id++)
 109                 if (!strcmp(id->id, hid))
 110                         return (const struct sdhci_acpi_slot *)id->driver_data;
 111         return NULL;
 112 }
 113
 114 static int sdhci_acpi_probe(struct platform_device *pdev)
 115 {
 116         struct device *dev = &pdev->dev;
 117         acpi_handle handle = ACPI_HANDLE(dev);
 118         struct acpi_device *device;
 119         struct sdhci_acpi_host *c;
 120         struct sdhci_host *host;
 121         struct resource *iomem;
 122         resource_size_t len;
 123         const char *hid;
 124         int err;
 125
 126         if (acpi_bus_get_device(handle, &device))
 127                 return -ENODEV;
 128
 129         if (acpi_bus_get_status(device) || !device->status.present)
 130                 return -ENODEV;
 131
 132         hid = acpi_device_hid(device);
 133
 134         iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 135         if (!iomem)
 136                 return -ENOMEM;
 137
 138         len = resource_size(iomem);
 139         if (len < 0x100)
 140                 dev_err(dev, "Invalid iomem size!\n");
 141
 142         if (!devm_request_mem_region(dev, iomem->start, len, dev_name(dev)))
 143                 return -ENOMEM;
 144
 145         host = sdhci_alloc_host(dev, sizeof(struct sdhci_acpi_host));
 146         if (IS_ERR(host))
 147                 return PTR_ERR(host);
 148
 149         c = sdhci_priv(host);
 150         c->host = host;
 151         c->slot = sdhci_acpi_get_slot(hid);
 152         c->pdev = pdev;
 153         c->use_runtime_pm = sdhci_acpi_flag(c, SDHCI_ACPI_RUNTIME_PM);
 154
 155         platform_set_drvdata(pdev, c);
 156
 157         host->hw_name   = "ACPI";
 158         host->ops       = &sdhci_acpi_ops_dflt;
 159         host->irq       = platform_get_irq(pdev, 0);
 160
 161         host->ioaddr = devm_ioremap_nocache(dev, iomem->start,
 162                                             resource_size(iomem));
 163         if (host->ioaddr == NULL) {
 164                 err = -ENOMEM;
 165                 goto err_free;
 166         }
 167
 168         if (!dev->dma_mask) {
 169                 u64 dma_mask;
 170
 171                 if (sdhci_readl(host, SDHCI_CAPABILITIES) & SDHCI_CAN_64BIT) {
 172                         /* 64-bit DMA is not supported at present */
 173                         dma_mask = DMA_BIT_MASK(32);
 174                 } else {
 175                         dma_mask = DMA_BIT_MASK(32);
 176                 }
 177
 178                 dev->dma_mask = &dev->coherent_dma_mask;
 179                 dev->coherent_dma_mask = dma_mask;
 180         }
 181
 182         if (c->slot) {
 183                 if (c->slot->chip) {
 184                         host->ops            = c->slot->chip->ops;
 185                         host->quirks        |= c->slot->chip->quirks;
 186                         host->quirks2       |= c->slot->chip->quirks2;
 187                         host->mmc->caps     |= c->slot->chip->caps;
 188                         host->mmc->caps2    |= c->slot->chip->caps2;
 189                         host->mmc->pm_caps  |= c->slot->chip->pm_caps;
 190                 }
 191                 host->quirks        |= c->slot->quirks;
 192                 host->quirks2       |= c->slot->quirks2;
 193                 host->mmc->caps     |= c->slot->caps;
 194                 host->mmc->caps2    |= c->slot->caps2;
 195                 host->mmc->pm_caps  |= c->slot->pm_caps;
 196         }
 197
 198         host->mmc->caps2 |= MMC_CAP2_NO_PRESCAN_POWERUP;
 199
 200         err = sdhci_add_host(host);
 201         if (err)
 202                 goto err_free;
 203
 204         if (c->use_runtime_pm) {
 205                 pm_suspend_ignore_children(dev, 1);
 206                 pm_runtime_set_autosuspend_delay(dev, 50);
 207                 pm_runtime_use_autosuspend(dev);
 208                 pm_runtime_enable(dev);
 209         }
 210
 211         return 0;
 212
 213 err_free:
 214         platform_set_drvdata(pdev, NULL);
 215         sdhci_free_host(c->host);
 216         return err;
 217 }
 218
 219 static int sdhci_acpi_remove(struct platform_device *pdev)
 220 {
 221         struct sdhci_acpi_host *c = platform_get_drvdata(pdev);
 222         struct device *dev = &pdev->dev;
 223         int dead;
 224
 225         if (c->use_runtime_pm) {
 226                 pm_runtime_get_sync(dev);
 227                 pm_runtime_disable(dev);
 228                 pm_runtime_put_noidle(dev);
 229         }
 230
 231         dead = (sdhci_readl(c->host, SDHCI_INT_STATUS) == ~0);
 232         sdhci_remove_host(c->host, dead);
 233         platform_set_drvdata(pdev, NULL);
 234         sdhci_free_host(c->host);
 235
 236         return 0;
 237 }
 238
 239 #ifdef CONFIG_PM_SLEEP
 240
 241 static int sdhci_acpi_suspend(struct device *dev)
 242 {
 243         struct sdhci_acpi_host *c = dev_get_drvdata(dev);
 244
 245         return sdhci_suspend_host(c->host);
 246 }
 247
 248 static int sdhci_acpi_resume(struct device *dev)
 249 {
 250         struct sdhci_acpi_host *c = dev_get_drvdata(dev);
 251
 252         return sdhci_resume_host(c->host);
 253 }
 254
 255 #else
 256
 257 #define sdhci_acpi_suspend      NULL
 258 #define sdhci_acpi_resume       NULL
 259
 260 #endif
 261
 262 #ifdef CONFIG_PM_RUNTIME
 263
 264 static int sdhci_acpi_runtime_suspend(struct device *dev)
 265 {
 266         struct sdhci_acpi_host *c = dev_get_drvdata(dev);
 267
 268         return sdhci_runtime_suspend_host(c->host);
 269 }
 270
 271 static int sdhci_acpi_runtime_resume(struct device *dev)
 272 {
 273         struct sdhci_acpi_host *c = dev_get_drvdata(dev);
 274
 275         return sdhci_runtime_resume_host(c->host);
 276 }
 277
 278 static int sdhci_acpi_runtime_idle(struct device *dev)
 279 {
 280         return 0;
 281 }
 282
 283 #else
 284
 285 #define sdhci_acpi_runtime_suspend      NULL
 286 #define sdhci_acpi_runtime_resume       NULL
 287 #define sdhci_acpi_runtime_idle         NULL
 288
 289 #endif
 290
 291 static const struct dev_pm_ops sdhci_acpi_pm_ops = {
 292         .suspend                = sdhci_acpi_suspend,
 293         .resume                 = sdhci_acpi_resume,
 294         .runtime_suspend        = sdhci_acpi_runtime_suspend,
 295         .runtime_resume         = sdhci_acpi_runtime_resume,
 296         .runtime_idle           = sdhci_acpi_runtime_idle,
 297 };
 298
 299 static struct platform_driver sdhci_acpi_driver = {
 300         .driver = {
 301                 .name                   = "sdhci-acpi",
 302                 .owner                  = THIS_MODULE,
 303                 .acpi_match_table       = sdhci_acpi_ids,
 304                 .pm                     = &sdhci_acpi_pm_ops,
 305         },
 306         .probe  = sdhci_acpi_probe,
 307         .remove = sdhci_acpi_remove,
 308 };
 309
 310 module_platform_driver(sdhci_acpi_driver);
 311
 312 MODULE_DESCRIPTION("Secure Digital Host Controller Interface ACPI driver");
 313 MODULE_AUTHOR("Adrian Hunter");
 314 MODULE_LICENSE("GPL v2");