drivers/mmc/host/sdhci-acpi.c - kernel/lockdown - Git at Google

 /*
  * Secure Digital Host Controller Interface ACPI driver.
  *
  * Copyright (c) 2012, Intel Corporation.
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms and conditions of the GNU General Public License,
  * version 2, as published by the Free Software Foundation.
  *
  * This program is distributed in the hope it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  * more details.
  *
  * You should have received a copy of the GNU General Public License along with
  * this program; if not, write to the Free Software Foundation, Inc.,
  * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
  *
  */

 #include <linux/init.h>
 #include <linux/export.h>
 #include <linux/module.h>
 #include <linux/device.h>
 #include <linux/platform_device.h>
 #include <linux/ioport.h>
 #include <linux/io.h>
 #include <linux/dma-mapping.h>
 #include <linux/compiler.h>
 #include <linux/stddef.h>
 #include <linux/bitops.h>
 #include <linux/types.h>
 #include <linux/err.h>
 #include <linux/gpio/consumer.h>
 #include <linux/interrupt.h>
 #include <linux/acpi.h>
 #include <linux/pm.h>
 #include <linux/pm_runtime.h>
 #include <linux/delay.h>

 #include <linux/mmc/host.h>
 #include <linux/mmc/pm.h>
 #include <linux/mmc/sdhci.h>

 #include "sdhci.h"

 enum {
 	SDHCI_ACPI_SD_CD	= BIT(0),
 	SDHCI_ACPI_RUNTIME_PM	= BIT(1),
 };

 struct sdhci_acpi_chip {
 	const struct	sdhci_ops *ops;
 	unsigned int	quirks;
 	unsigned int	quirks2;
 	unsigned long	caps;
 	unsigned int	caps2;
 	mmc_pm_flag_t	pm_caps;
 };

 struct sdhci_acpi_slot {
 	const struct	sdhci_acpi_chip *chip;
 	unsigned int	quirks;
 	unsigned int	quirks2;
 	unsigned long	caps;
 	unsigned int	caps2;
 	mmc_pm_flag_t	pm_caps;
 	unsigned int	flags;
 };

 struct sdhci_acpi_host {
 	struct sdhci_host		*host;
 	const struct sdhci_acpi_slot	*slot;
 	struct platform_device		*pdev;
 	bool				use_runtime_pm;
 };

 static inline bool sdhci_acpi_flag(struct sdhci_acpi_host *c, unsigned int flag)
 {
 	return c->slot && (c->slot->flags & flag);
 }

 static int sdhci_acpi_enable_dma(struct sdhci_host *host)
 {
 	return 0;
 }

 static void sdhci_acpi_int_hw_reset(struct sdhci_host *host)
 {
 	u8 reg;

 	reg = sdhci_readb(host, SDHCI_POWER_CONTROL);
 	reg |= 0x10;
 	sdhci_writeb(host, reg, SDHCI_POWER_CONTROL);
 	/* For eMMC, minimum is 1us but give it 9us for good measure */
 	udelay(9);
 	reg &= ~0x10;
 	sdhci_writeb(host, reg, SDHCI_POWER_CONTROL);
 	/* For eMMC, minimum is 200us but give it 300us for good measure */
 	usleep_range(300, 1000);
 }

 static const struct sdhci_ops sdhci_acpi_ops_dflt = {
 	.enable_dma = sdhci_acpi_enable_dma,
 };

 static const struct sdhci_ops sdhci_acpi_ops_int = {
 	.enable_dma = sdhci_acpi_enable_dma,
 	.hw_reset   = sdhci_acpi_int_hw_reset,
 };

 static const struct sdhci_acpi_chip sdhci_acpi_chip_int = {
 	.ops = &sdhci_acpi_ops_int,
 };

 static const struct sdhci_acpi_slot sdhci_acpi_slot_int_emmc = {
 	.chip    = &sdhci_acpi_chip_int,
 	.caps    = MMC_CAP_8_BIT_DATA | MMC_CAP_NONREMOVABLE | MMC_CAP_HW_RESET,
 	.caps2   = MMC_CAP2_HC_ERASE_SZ,
 	.flags   = SDHCI_ACPI_RUNTIME_PM,
 };

 static const struct sdhci_acpi_slot sdhci_acpi_slot_int_sdio = {
 	.quirks2 = SDHCI_QUIRK2_HOST_OFF_CARD_ON,
 	.caps    = MMC_CAP_NONREMOVABLE | MMC_CAP_POWER_OFF_CARD,
 	.flags   = SDHCI_ACPI_RUNTIME_PM,
 	.pm_caps = MMC_PM_KEEP_POWER,
 };

 static const struct sdhci_acpi_slot sdhci_acpi_slot_int_sd = {
 	.flags   = SDHCI_ACPI_SD_CD | SDHCI_ACPI_RUNTIME_PM,
 	.quirks2 = SDHCI_QUIRK2_CARD_ON_NEEDS_BUS_ON,
 };

 struct sdhci_acpi_uid_slot {
 	const char *hid;
 	const char *uid;
 	const struct sdhci_acpi_slot *slot;
 };

 static const struct sdhci_acpi_uid_slot sdhci_acpi_uids[] = {
 	{ "80860F14" , "1" , &sdhci_acpi_slot_int_emmc },
 	{ "80860F14" , "3" , &sdhci_acpi_slot_int_sd   },
 	{ "INT33BB"  , "2" , &sdhci_acpi_slot_int_sdio },
 	{ "INT33C6"  , NULL, &sdhci_acpi_slot_int_sdio },
 	{ "INT3436"  , NULL, &sdhci_acpi_slot_int_sdio },
 	{ "PNP0D40"  },
 	{ },
 };

 static const struct acpi_device_id sdhci_acpi_ids[] = {
 	{ "80860F14" },
 	{ "INT33BB"  },
 	{ "INT33C6"  },
 	{ "INT3436"  },
 	{ "PNP0D40"  },
 	{ },
 };
 MODULE_DEVICE_TABLE(acpi, sdhci_acpi_ids);

 static const struct sdhci_acpi_slot *sdhci_acpi_get_slot_by_ids(const char *hid,
 								const char *uid)
 {
 	const struct sdhci_acpi_uid_slot *u;

 	for (u = sdhci_acpi_uids; u->hid; u++) {
 		if (strcmp(u->hid, hid))
 			continue;
 		if (!u->uid)
 			return u->slot;
 		if (uid && !strcmp(u->uid, uid))
 			return u->slot;
 	}
 	return NULL;
 }

 static const struct sdhci_acpi_slot *sdhci_acpi_get_slot(acpi_handle handle,
 							 const char *hid)
 {
 	const struct sdhci_acpi_slot *slot;
 	struct acpi_device_info *info;
 	const char *uid = NULL;
 	acpi_status status;

 	status = acpi_get_object_info(handle, &info);
 	if (!ACPI_FAILURE(status) && (info->valid & ACPI_VALID_UID))
 		uid = info->unique_id.string;

 	slot = sdhci_acpi_get_slot_by_ids(hid, uid);

 	kfree(info);
 	return slot;
 }

 #ifdef CONFIG_PM_RUNTIME

 static irqreturn_t sdhci_acpi_sd_cd(int irq, void *dev_id)
 {
 	mmc_detect_change(dev_id, msecs_to_jiffies(200));
 	return IRQ_HANDLED;
 }

 static int sdhci_acpi_add_own_cd(struct device *dev, struct mmc_host *mmc)
 {
 	struct gpio_desc *desc;
 	unsigned long flags;
 	int err, irq;

 	desc = devm_gpiod_get_index(dev, "sd_cd", 0);
 	if (IS_ERR(desc)) {
 		err = PTR_ERR(desc);
 		goto out;
 	}

 	err = gpiod_direction_input(desc);
 	if (err)
 		goto out_free;

 	irq = gpiod_to_irq(desc);
 	if (irq < 0) {
 		err = irq;
 		goto out_free;
 	}

 	flags = IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING;
 	err = devm_request_irq(dev, irq, sdhci_acpi_sd_cd, flags, "sd_cd", mmc);
 	if (err)
 		goto out_free;

 	return 0;

 out_free:
 	devm_gpiod_put(dev, desc);
 out:
 	dev_warn(dev, "failed to setup card detect wake up\n");
 	return err;
 }

 #else

 static int sdhci_acpi_add_own_cd(struct device *dev, struct mmc_host *mmc)
 {
 	return 0;
 }

 #endif

 static int sdhci_acpi_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
 	acpi_handle handle = ACPI_HANDLE(dev);
 	struct acpi_device *device;
 	struct sdhci_acpi_host *c;
 	struct sdhci_host *host;
 	struct resource *iomem;
 	resource_size_t len;
 	const char *hid;
 	int err;

 	if (acpi_bus_get_device(handle, &device))
 		return -ENODEV;

 	if (acpi_bus_get_status(device) || !device->status.present)
 		return -ENODEV;

 	hid = acpi_device_hid(device);

 	iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	if (!iomem)
 		return -ENOMEM;

 	len = resource_size(iomem);
 	if (len < 0x100)
 		dev_err(dev, "Invalid iomem size!\n");

 	if (!devm_request_mem_region(dev, iomem->start, len, dev_name(dev)))
 		return -ENOMEM;

 	host = sdhci_alloc_host(dev, sizeof(struct sdhci_acpi_host));
 	if (IS_ERR(host))
 		return PTR_ERR(host);

 	c = sdhci_priv(host);
 	c->host = host;
 	c->slot = sdhci_acpi_get_slot(handle, hid);
 	c->pdev = pdev;
 	c->use_runtime_pm = sdhci_acpi_flag(c, SDHCI_ACPI_RUNTIME_PM);

 	platform_set_drvdata(pdev, c);

 	host->hw_name	= "ACPI";
 	host->ops	= &sdhci_acpi_ops_dflt;
 	host->irq	= platform_get_irq(pdev, 0);

 	host->ioaddr = devm_ioremap_nocache(dev, iomem->start,
 					    resource_size(iomem));
 	if (host->ioaddr == NULL) {
 		err = -ENOMEM;
 		goto err_free;
 	}

 	if (!dev->dma_mask) {
 		u64 dma_mask;

 		if (sdhci_readl(host, SDHCI_CAPABILITIES) & SDHCI_CAN_64BIT) {
 			/* 64-bit DMA is not supported at present */
 			dma_mask = DMA_BIT_MASK(32);
 		} else {
 			dma_mask = DMA_BIT_MASK(32);
 		}

 		err = dma_coerce_mask_and_coherent(dev, dma_mask);
 		if (err)
 			goto err_free;
 	}

 	if (c->slot) {
 		if (c->slot->chip) {
 			host->ops            = c->slot->chip->ops;
 			host->quirks        |= c->slot->chip->quirks;
 			host->quirks2       |= c->slot->chip->quirks2;
 			host->mmc->caps     |= c->slot->chip->caps;
 			host->mmc->caps2    |= c->slot->chip->caps2;
 			host->mmc->pm_caps  |= c->slot->chip->pm_caps;
 		}
 		host->quirks        |= c->slot->quirks;
 		host->quirks2       |= c->slot->quirks2;
 		host->mmc->caps     |= c->slot->caps;
 		host->mmc->caps2    |= c->slot->caps2;
 		host->mmc->pm_caps  |= c->slot->pm_caps;
 	}

 	host->mmc->caps2 |= MMC_CAP2_NO_PRESCAN_POWERUP;

 	err = sdhci_add_host(host);
 	if (err)
 		goto err_free;

 	if (sdhci_acpi_flag(c, SDHCI_ACPI_SD_CD)) {
 		if (sdhci_acpi_add_own_cd(dev, host->mmc))
 			c->use_runtime_pm = false;
 	}

 	if (c->use_runtime_pm) {
 		pm_runtime_set_active(dev);
 		pm_suspend_ignore_children(dev, 1);
 		pm_runtime_set_autosuspend_delay(dev, 50);
 		pm_runtime_use_autosuspend(dev);
 		pm_runtime_enable(dev);
 	}

 	return 0;

 err_free:
 	sdhci_free_host(c->host);
 	return err;
 }

 static int sdhci_acpi_remove(struct platform_device *pdev)
 {
 	struct sdhci_acpi_host *c = platform_get_drvdata(pdev);
 	struct device *dev = &pdev->dev;
 	int dead;

 	if (c->use_runtime_pm) {
 		pm_runtime_get_sync(dev);
 		pm_runtime_disable(dev);
 		pm_runtime_put_noidle(dev);
 	}

 	dead = (sdhci_readl(c->host, SDHCI_INT_STATUS) == ~0);
 	sdhci_remove_host(c->host, dead);
 	sdhci_free_host(c->host);

 	return 0;
 }

 #ifdef CONFIG_PM_SLEEP

 static int sdhci_acpi_suspend(struct device *dev)
 {
 	struct sdhci_acpi_host *c = dev_get_drvdata(dev);

 	return sdhci_suspend_host(c->host);
 }

 static int sdhci_acpi_resume(struct device *dev)
 {
 	struct sdhci_acpi_host *c = dev_get_drvdata(dev);

 	return sdhci_resume_host(c->host);
 }

 #else

 #define sdhci_acpi_suspend	NULL
 #define sdhci_acpi_resume	NULL

 #endif

 #ifdef CONFIG_PM_RUNTIME

 static int sdhci_acpi_runtime_suspend(struct device *dev)
 {
 	struct sdhci_acpi_host *c = dev_get_drvdata(dev);

 	return sdhci_runtime_suspend_host(c->host);
 }

 static int sdhci_acpi_runtime_resume(struct device *dev)
 {
 	struct sdhci_acpi_host *c = dev_get_drvdata(dev);

 	return sdhci_runtime_resume_host(c->host);
 }

 static int sdhci_acpi_runtime_idle(struct device *dev)
 {
 	return 0;
 }

 #else

 #define sdhci_acpi_runtime_suspend	NULL
 #define sdhci_acpi_runtime_resume	NULL
 #define sdhci_acpi_runtime_idle		NULL

 #endif

 static const struct dev_pm_ops sdhci_acpi_pm_ops = {
 	.suspend		= sdhci_acpi_suspend,
 	.resume			= sdhci_acpi_resume,
 	.runtime_suspend	= sdhci_acpi_runtime_suspend,
 	.runtime_resume		= sdhci_acpi_runtime_resume,
 	.runtime_idle		= sdhci_acpi_runtime_idle,
 };

 static struct platform_driver sdhci_acpi_driver = {
 	.driver = {
 		.name			= "sdhci-acpi",
 		.owner			= THIS_MODULE,
 		.acpi_match_table	= sdhci_acpi_ids,
 		.pm			= &sdhci_acpi_pm_ops,
 	},
 	.probe	= sdhci_acpi_probe,
 	.remove	= sdhci_acpi_remove,
 };

 module_platform_driver(sdhci_acpi_driver);

 MODULE_DESCRIPTION("Secure Digital Host Controller Interface ACPI driver");
 MODULE_AUTHOR("Adrian Hunter");
 MODULE_LICENSE("GPL v2");
	/*
	* Secure Digital Host Controller Interface ACPI driver.
	*
	* Copyright (c) 2012, Intel Corporation.
	*
	* This program is free software; you can redistribute it and/or modify it
	* under the terms and conditions of the GNU General Public License,
	* version 2, as published by the Free Software Foundation.
	*
	* This program is distributed in the hope it will be useful, but WITHOUT
	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
	* more details.
	*
	* You should have received a copy of the GNU General Public License along with
	* this program; if not, write to the Free Software Foundation, Inc.,
	* 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
	*
	*/

	#include <linux/init.h>
	#include <linux/export.h>
	#include <linux/module.h>
	#include <linux/device.h>
	#include <linux/platform_device.h>
	#include <linux/ioport.h>
	#include <linux/io.h>
	#include <linux/dma-mapping.h>
	#include <linux/compiler.h>
	#include <linux/stddef.h>
	#include <linux/bitops.h>
	#include <linux/types.h>
	#include <linux/err.h>
	#include <linux/gpio/consumer.h>
	#include <linux/interrupt.h>
	#include <linux/acpi.h>
	#include <linux/pm.h>
	#include <linux/pm_runtime.h>
	#include <linux/delay.h>

	#include <linux/mmc/host.h>
	#include <linux/mmc/pm.h>
	#include <linux/mmc/sdhci.h>

	#include "sdhci.h"

	enum {
	SDHCI_ACPI_SD_CD = BIT(0),
	SDHCI_ACPI_RUNTIME_PM = BIT(1),
	};

	struct sdhci_acpi_chip {
	const struct sdhci_ops *ops;
	unsigned int quirks;
	unsigned int quirks2;
	unsigned long caps;
	unsigned int caps2;
	mmc_pm_flag_t pm_caps;
	};

	struct sdhci_acpi_slot {
	const struct sdhci_acpi_chip *chip;
	unsigned int quirks;
	unsigned int quirks2;
	unsigned long caps;
	unsigned int caps2;
	mmc_pm_flag_t pm_caps;
	unsigned int flags;
	};

	struct sdhci_acpi_host {
	struct sdhci_host *host;
	const struct sdhci_acpi_slot *slot;
	struct platform_device *pdev;
	bool use_runtime_pm;
	};

	static inline bool sdhci_acpi_flag(struct sdhci_acpi_host *c, unsigned int flag)
	{
	return c->slot && (c->slot->flags & flag);
	}

	static int sdhci_acpi_enable_dma(struct sdhci_host *host)
	{
	return 0;
	}

	static void sdhci_acpi_int_hw_reset(struct sdhci_host *host)
	{
	u8 reg;

	reg = sdhci_readb(host, SDHCI_POWER_CONTROL);
	reg \|= 0x10;
	sdhci_writeb(host, reg, SDHCI_POWER_CONTROL);
	/* For eMMC, minimum is 1us but give it 9us for good measure */
	udelay(9);
	reg &= ~0x10;
	sdhci_writeb(host, reg, SDHCI_POWER_CONTROL);
	/* For eMMC, minimum is 200us but give it 300us for good measure */
	usleep_range(300, 1000);
	}

	static const struct sdhci_ops sdhci_acpi_ops_dflt = {
	.enable_dma = sdhci_acpi_enable_dma,
	};

	static const struct sdhci_ops sdhci_acpi_ops_int = {
	.enable_dma = sdhci_acpi_enable_dma,
	.hw_reset = sdhci_acpi_int_hw_reset,
	};

	static const struct sdhci_acpi_chip sdhci_acpi_chip_int = {
	.ops = &sdhci_acpi_ops_int,
	};

	static const struct sdhci_acpi_slot sdhci_acpi_slot_int_emmc = {
	.chip = &sdhci_acpi_chip_int,
	.caps = MMC_CAP_8_BIT_DATA \| MMC_CAP_NONREMOVABLE \| MMC_CAP_HW_RESET,
	.caps2 = MMC_CAP2_HC_ERASE_SZ,
	.flags = SDHCI_ACPI_RUNTIME_PM,
	};

	static const struct sdhci_acpi_slot sdhci_acpi_slot_int_sdio = {
	.quirks2 = SDHCI_QUIRK2_HOST_OFF_CARD_ON,
	.caps = MMC_CAP_NONREMOVABLE \| MMC_CAP_POWER_OFF_CARD,
	.flags = SDHCI_ACPI_RUNTIME_PM,
	.pm_caps = MMC_PM_KEEP_POWER,
	};

	static const struct sdhci_acpi_slot sdhci_acpi_slot_int_sd = {
	.flags = SDHCI_ACPI_SD_CD \| SDHCI_ACPI_RUNTIME_PM,
	.quirks2 = SDHCI_QUIRK2_CARD_ON_NEEDS_BUS_ON,
	};

	struct sdhci_acpi_uid_slot {
	const char *hid;
	const char *uid;
	const struct sdhci_acpi_slot *slot;
	};

	static const struct sdhci_acpi_uid_slot sdhci_acpi_uids[] = {
	{ "80860F14" , "1" , &sdhci_acpi_slot_int_emmc },
	{ "80860F14" , "3" , &sdhci_acpi_slot_int_sd },
	{ "INT33BB" , "2" , &sdhci_acpi_slot_int_sdio },
	{ "INT33C6" , NULL, &sdhci_acpi_slot_int_sdio },
	{ "INT3436" , NULL, &sdhci_acpi_slot_int_sdio },
	{ "PNP0D40" },
	{ },
	};

	static const struct acpi_device_id sdhci_acpi_ids[] = {
	{ "80860F14" },
	{ "INT33BB" },
	{ "INT33C6" },
	{ "INT3436" },
	{ "PNP0D40" },
	{ },
	};
	MODULE_DEVICE_TABLE(acpi, sdhci_acpi_ids);

	static const struct sdhci_acpi_slot sdhci_acpi_get_slot_by_ids(const char hid,
	const char *uid)
	{
	const struct sdhci_acpi_uid_slot *u;

	for (u = sdhci_acpi_uids; u->hid; u++) {
	if (strcmp(u->hid, hid))
	continue;
	if (!u->uid)
	return u->slot;
	if (uid && !strcmp(u->uid, uid))
	return u->slot;
	}
	return NULL;
	}

	static const struct sdhci_acpi_slot *sdhci_acpi_get_slot(acpi_handle handle,
	const char *hid)
	{
	const struct sdhci_acpi_slot *slot;
	struct acpi_device_info *info;
	const char *uid = NULL;
	acpi_status status;

	status = acpi_get_object_info(handle, &info);
	if (!ACPI_FAILURE(status) && (info->valid & ACPI_VALID_UID))
	uid = info->unique_id.string;

	slot = sdhci_acpi_get_slot_by_ids(hid, uid);

	kfree(info);
	return slot;
	}

	#ifdef CONFIG_PM_RUNTIME

	static irqreturn_t sdhci_acpi_sd_cd(int irq, void *dev_id)
	{
	mmc_detect_change(dev_id, msecs_to_jiffies(200));
	return IRQ_HANDLED;
	}

	static int sdhci_acpi_add_own_cd(struct device dev, struct mmc_host mmc)
	{
	struct gpio_desc *desc;
	unsigned long flags;
	int err, irq;

	desc = devm_gpiod_get_index(dev, "sd_cd", 0);
	if (IS_ERR(desc)) {
	err = PTR_ERR(desc);
	goto out;
	}

	err = gpiod_direction_input(desc);
	if (err)
	goto out_free;

	irq = gpiod_to_irq(desc);
	if (irq < 0) {
	err = irq;
	goto out_free;
	}

	flags = IRQF_TRIGGER_RISING \| IRQF_TRIGGER_FALLING;
	err = devm_request_irq(dev, irq, sdhci_acpi_sd_cd, flags, "sd_cd", mmc);
	if (err)
	goto out_free;

	return 0;

	out_free:
	devm_gpiod_put(dev, desc);
	out:
	dev_warn(dev, "failed to setup card detect wake up\n");
	return err;
	}

	#else

	static int sdhci_acpi_add_own_cd(struct device dev, struct mmc_host mmc)
	{
	return 0;
	}

	#endif

	static int sdhci_acpi_probe(struct platform_device *pdev)
	{
	struct device *dev = &pdev->dev;
	acpi_handle handle = ACPI_HANDLE(dev);
	struct acpi_device *device;
	struct sdhci_acpi_host *c;
	struct sdhci_host *host;
	struct resource *iomem;
	resource_size_t len;
	const char *hid;
	int err;

	if (acpi_bus_get_device(handle, &device))
	return -ENODEV;

	if (acpi_bus_get_status(device) \|\| !device->status.present)
	return -ENODEV;

	hid = acpi_device_hid(device);

	iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!iomem)
	return -ENOMEM;

	len = resource_size(iomem);
	if (len < 0x100)
	dev_err(dev, "Invalid iomem size!\n");

	if (!devm_request_mem_region(dev, iomem->start, len, dev_name(dev)))
	return -ENOMEM;

	host = sdhci_alloc_host(dev, sizeof(struct sdhci_acpi_host));
	if (IS_ERR(host))
	return PTR_ERR(host);

	c = sdhci_priv(host);
	c->host = host;
	c->slot = sdhci_acpi_get_slot(handle, hid);
	c->pdev = pdev;
	c->use_runtime_pm = sdhci_acpi_flag(c, SDHCI_ACPI_RUNTIME_PM);

	platform_set_drvdata(pdev, c);

	host->hw_name = "ACPI";
	host->ops = &sdhci_acpi_ops_dflt;
	host->irq = platform_get_irq(pdev, 0);

	host->ioaddr = devm_ioremap_nocache(dev, iomem->start,
	resource_size(iomem));
	if (host->ioaddr == NULL) {
	err = -ENOMEM;
	goto err_free;
	}

	if (!dev->dma_mask) {
	u64 dma_mask;

	if (sdhci_readl(host, SDHCI_CAPABILITIES) & SDHCI_CAN_64BIT) {
	/* 64-bit DMA is not supported at present */
	dma_mask = DMA_BIT_MASK(32);
	} else {
	dma_mask = DMA_BIT_MASK(32);
	}

	err = dma_coerce_mask_and_coherent(dev, dma_mask);
	if (err)
	goto err_free;
	}

	if (c->slot) {
	if (c->slot->chip) {
	host->ops = c->slot->chip->ops;
	host->quirks \|= c->slot->chip->quirks;
	host->quirks2 \|= c->slot->chip->quirks2;
	host->mmc->caps \|= c->slot->chip->caps;
	host->mmc->caps2 \|= c->slot->chip->caps2;
	host->mmc->pm_caps \|= c->slot->chip->pm_caps;
	}
	host->quirks \|= c->slot->quirks;
	host->quirks2 \|= c->slot->quirks2;
	host->mmc->caps \|= c->slot->caps;
	host->mmc->caps2 \|= c->slot->caps2;
	host->mmc->pm_caps \|= c->slot->pm_caps;
	}

	host->mmc->caps2 \|= MMC_CAP2_NO_PRESCAN_POWERUP;

	err = sdhci_add_host(host);
	if (err)
	goto err_free;

	if (sdhci_acpi_flag(c, SDHCI_ACPI_SD_CD)) {
	if (sdhci_acpi_add_own_cd(dev, host->mmc))
	c->use_runtime_pm = false;
	}

	if (c->use_runtime_pm) {
	pm_runtime_set_active(dev);
	pm_suspend_ignore_children(dev, 1);
	pm_runtime_set_autosuspend_delay(dev, 50);
	pm_runtime_use_autosuspend(dev);
	pm_runtime_enable(dev);
	}

	return 0;

	err_free:
	sdhci_free_host(c->host);
	return err;
	}

	static int sdhci_acpi_remove(struct platform_device *pdev)
	{
	struct sdhci_acpi_host *c = platform_get_drvdata(pdev);
	struct device *dev = &pdev->dev;
	int dead;

	if (c->use_runtime_pm) {
	pm_runtime_get_sync(dev);
	pm_runtime_disable(dev);
	pm_runtime_put_noidle(dev);
	}

	dead = (sdhci_readl(c->host, SDHCI_INT_STATUS) == ~0);
	sdhci_remove_host(c->host, dead);
	sdhci_free_host(c->host);

	return 0;
	}

	#ifdef CONFIG_PM_SLEEP

	static int sdhci_acpi_suspend(struct device *dev)
	{
	struct sdhci_acpi_host *c = dev_get_drvdata(dev);

	return sdhci_suspend_host(c->host);
	}

	static int sdhci_acpi_resume(struct device *dev)
	{
	struct sdhci_acpi_host *c = dev_get_drvdata(dev);

	return sdhci_resume_host(c->host);
	}

	#else

	#define sdhci_acpi_suspend NULL
	#define sdhci_acpi_resume NULL

	#endif

	#ifdef CONFIG_PM_RUNTIME

	static int sdhci_acpi_runtime_suspend(struct device *dev)
	{
	struct sdhci_acpi_host *c = dev_get_drvdata(dev);

	return sdhci_runtime_suspend_host(c->host);
	}

	static int sdhci_acpi_runtime_resume(struct device *dev)
	{
	struct sdhci_acpi_host *c = dev_get_drvdata(dev);

	return sdhci_runtime_resume_host(c->host);
	}

	static int sdhci_acpi_runtime_idle(struct device *dev)
	{
	return 0;
	}

	#else

	#define sdhci_acpi_runtime_suspend NULL
	#define sdhci_acpi_runtime_resume NULL
	#define sdhci_acpi_runtime_idle NULL

	#endif

	static const struct dev_pm_ops sdhci_acpi_pm_ops = {
	.suspend = sdhci_acpi_suspend,
	.resume = sdhci_acpi_resume,
	.runtime_suspend = sdhci_acpi_runtime_suspend,
	.runtime_resume = sdhci_acpi_runtime_resume,
	.runtime_idle = sdhci_acpi_runtime_idle,
	};

	static struct platform_driver sdhci_acpi_driver = {
	.driver = {
	.name = "sdhci-acpi",
	.owner = THIS_MODULE,
	.acpi_match_table = sdhci_acpi_ids,
	.pm = &sdhci_acpi_pm_ops,
	},
	.probe = sdhci_acpi_probe,
	.remove = sdhci_acpi_remove,
	};

	module_platform_driver(sdhci_acpi_driver);

	MODULE_DESCRIPTION("Secure Digital Host Controller Interface ACPI driver");
	MODULE_AUTHOR("Adrian Hunter");
	MODULE_LICENSE("GPL v2");