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 acpi_device_id sdhci_acpi_ids[] = {
  91         { "PNP0D40" },
  92         { },
  93 };
  94 MODULE_DEVICE_TABLE(acpi, sdhci_acpi_ids);
  95
  96 static const struct sdhci_acpi_slot *sdhci_acpi_get_slot(const char *hid)
  97 {
  98         const struct acpi_device_id *id;
  99
 100         for (id = sdhci_acpi_ids; id->id[0]; id++)
 101                 if (!strcmp(id->id, hid))
 102                         return (const struct sdhci_acpi_slot *)id->driver_data;
 103         return NULL;
 104 }
 105
 106 static int __devinit sdhci_acpi_probe(struct platform_device *pdev)
 107 {
 108         struct device *dev = &pdev->dev;
 109         acpi_handle handle = ACPI_HANDLE(dev);
 110         struct acpi_device *device;
 111         struct sdhci_acpi_host *c;
 112         struct sdhci_host *host;
 113         struct resource *iomem;
 114         resource_size_t len;
 115         const char *hid;
 116         int err;
 117
 118         if (acpi_bus_get_device(handle, &device))
 119                 return -ENODEV;
 120
 121         if (acpi_bus_get_status(device) || !device->status.present)
 122                 return -ENODEV;
 123
 124         hid = acpi_device_hid(device);
 125
 126         iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 127         if (!iomem)
 128                 return -ENOMEM;
 129
 130         len = resource_size(iomem);
 131         if (len < 0x100)
 132                 dev_err(dev, "Invalid iomem size!\n");
 133
 134         if (!devm_request_mem_region(dev, iomem->start, len, dev_name(dev)))
 135                 return -ENOMEM;
 136
 137         host = sdhci_alloc_host(dev, sizeof(struct sdhci_acpi_host));
 138         if (IS_ERR(host))
 139                 return PTR_ERR(host);
 140
 141         c = sdhci_priv(host);
 142         c->host = host;
 143         c->slot = sdhci_acpi_get_slot(hid);
 144         c->pdev = pdev;
 145         c->use_runtime_pm = sdhci_acpi_flag(c, SDHCI_ACPI_RUNTIME_PM);
 146
 147         platform_set_drvdata(pdev, c);
 148
 149         host->hw_name   = "ACPI";
 150         host->ops       = &sdhci_acpi_ops_dflt;
 151         host->irq       = platform_get_irq(pdev, 0);
 152
 153         host->ioaddr = devm_ioremap_nocache(dev, iomem->start,
 154                                             resource_size(iomem));
 155         if (host->ioaddr == NULL) {
 156                 err = -ENOMEM;
 157                 goto err_free;
 158         }
 159
 160         if (!dev->dma_mask) {
 161                 u64 dma_mask;
 162
 163                 if (sdhci_readl(host, SDHCI_CAPABILITIES) & SDHCI_CAN_64BIT) {
 164                         /* 64-bit DMA is not supported at present */
 165                         dma_mask = DMA_BIT_MASK(32);
 166                 } else {
 167                         dma_mask = DMA_BIT_MASK(32);
 168                 }
 169
 170                 dev->dma_mask = &dev->coherent_dma_mask;
 171                 dev->coherent_dma_mask = dma_mask;
 172         }
 173
 174         if (c->slot) {
 175                 if (c->slot->chip) {
 176                         host->ops            = c->slot->chip->ops;
 177                         host->quirks        |= c->slot->chip->quirks;
 178                         host->quirks2       |= c->slot->chip->quirks2;
 179                         host->mmc->caps     |= c->slot->chip->caps;
 180                         host->mmc->caps2    |= c->slot->chip->caps2;
 181                         host->mmc->pm_caps  |= c->slot->chip->pm_caps;
 182                 }
 183                 host->quirks        |= c->slot->quirks;
 184                 host->quirks2       |= c->slot->quirks2;
 185                 host->mmc->caps     |= c->slot->caps;
 186                 host->mmc->caps2    |= c->slot->caps2;
 187                 host->mmc->pm_caps  |= c->slot->pm_caps;
 188         }
 189
 190         err = sdhci_add_host(host);
 191         if (err)
 192                 goto err_free;
 193
 194         if (c->use_runtime_pm) {
 195                 pm_suspend_ignore_children(dev, 1);
 196                 pm_runtime_set_autosuspend_delay(dev, 50);
 197                 pm_runtime_use_autosuspend(dev);
 198                 pm_runtime_enable(dev);
 199         }
 200
 201         return 0;
 202
 203 err_free:
 204         platform_set_drvdata(pdev, NULL);
 205         sdhci_free_host(c->host);
 206         return err;
 207 }
 208
 209 static int __devexit sdhci_acpi_remove(struct platform_device *pdev)
 210 {
 211         struct sdhci_acpi_host *c = platform_get_drvdata(pdev);
 212         struct device *dev = &pdev->dev;
 213         int dead;
 214
 215         if (c->use_runtime_pm) {
 216                 pm_runtime_get_sync(dev);
 217                 pm_runtime_disable(dev);
 218                 pm_runtime_put_noidle(dev);
 219         }
 220
 221         dead = (sdhci_readl(c->host, SDHCI_INT_STATUS) == ~0);
 222         sdhci_remove_host(c->host, dead);
 223         platform_set_drvdata(pdev, NULL);
 224         sdhci_free_host(c->host);
 225
 226         return 0;
 227 }
 228
 229 #ifdef CONFIG_PM_SLEEP
 230
 231 static int sdhci_acpi_suspend(struct device *dev)
 232 {
 233         struct sdhci_acpi_host *c = dev_get_drvdata(dev);
 234
 235         return sdhci_suspend_host(c->host);
 236 }
 237
 238 static int sdhci_acpi_resume(struct device *dev)
 239 {
 240         struct sdhci_acpi_host *c = dev_get_drvdata(dev);
 241
 242         return sdhci_resume_host(c->host);
 243 }
 244
 245 #else
 246
 247 #define sdhci_acpi_suspend      NULL
 248 #define sdhci_acpi_resume       NULL
 249
 250 #endif
 251
 252 #ifdef CONFIG_PM_RUNTIME
 253
 254 static int sdhci_acpi_runtime_suspend(struct device *dev)
 255 {
 256         struct sdhci_acpi_host *c = dev_get_drvdata(dev);
 257
 258         return sdhci_runtime_suspend_host(c->host);
 259 }
 260
 261 static int sdhci_acpi_runtime_resume(struct device *dev)
 262 {
 263         struct sdhci_acpi_host *c = dev_get_drvdata(dev);
 264
 265         return sdhci_runtime_resume_host(c->host);
 266 }
 267
 268 static int sdhci_acpi_runtime_idle(struct device *dev)
 269 {
 270         return 0;
 271 }
 272
 273 #else
 274
 275 #define sdhci_acpi_runtime_suspend      NULL
 276 #define sdhci_acpi_runtime_resume       NULL
 277 #define sdhci_acpi_runtime_idle         NULL
 278
 279 #endif
 280
 281 static const struct dev_pm_ops sdhci_acpi_pm_ops = {
 282         .suspend                = sdhci_acpi_suspend,
 283         .resume                 = sdhci_acpi_resume,
 284         .runtime_suspend        = sdhci_acpi_runtime_suspend,
 285         .runtime_resume         = sdhci_acpi_runtime_resume,
 286         .runtime_idle           = sdhci_acpi_runtime_idle,
 287 };
 288
 289 static struct platform_driver sdhci_acpi_driver = {
 290         .driver = {
 291                 .name                   = "sdhci-acpi",
 292                 .owner                  = THIS_MODULE,
 293                 .acpi_match_table       = sdhci_acpi_ids,
 294                 .pm                     = &sdhci_acpi_pm_ops,
 295         },
 296         .probe  = sdhci_acpi_probe,
 297         .remove = __devexit_p(sdhci_acpi_remove),
 298 };
 299
 300 module_platform_driver(sdhci_acpi_driver);
 301
 302 MODULE_DESCRIPTION("Secure Digital Host Controller Interface ACPI driver");
 303 MODULE_AUTHOR("Adrian Hunter");
 304 MODULE_LICENSE("GPL v2");