drivers/net/wireless/ath/ath9k/pci.c - SHIFTPHONES/mainline/linux - Gitiles

 /*
  * Copyright (c) 2008-2009 Atheros Communications Inc.
  *
  * Permission to use, copy, modify, and/or distribute this software for any
  * purpose with or without fee is hereby granted, provided that the above
  * copyright notice and this permission notice appear in all copies.
  *
  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */

 #include <linux/nl80211.h>
 #include <linux/pci.h>
 #include <linux/ath9k_platform.h>
 #include "ath9k.h"

 static DEFINE_PCI_DEVICE_TABLE(ath_pci_id_table) = {
 	{ PCI_VDEVICE(ATHEROS, 0x0023) }, /* PCI   */
 	{ PCI_VDEVICE(ATHEROS, 0x0024) }, /* PCI-E */
 	{ PCI_VDEVICE(ATHEROS, 0x0027) }, /* PCI   */
 	{ PCI_VDEVICE(ATHEROS, 0x0029) }, /* PCI   */
 	{ PCI_VDEVICE(ATHEROS, 0x002A) }, /* PCI-E */
 	{ PCI_VDEVICE(ATHEROS, 0x002B) }, /* PCI-E */
 	{ PCI_VDEVICE(ATHEROS, 0x002C) }, /* PCI-E 802.11n bonded out */
 	{ PCI_VDEVICE(ATHEROS, 0x002D) }, /* PCI   */
 	{ PCI_VDEVICE(ATHEROS, 0x002E) }, /* PCI-E */
 	{ PCI_VDEVICE(ATHEROS, 0x0030) }, /* PCI-E  AR9300 */
 	{ PCI_VDEVICE(ATHEROS, 0x0032) }, /* PCI-E  AR9485 */
 	{ 0 }
 };

 /* return bus cachesize in 4B word units */
 static void ath_pci_read_cachesize(struct ath_common *common, int *csz)
 {
 	struct ath_softc *sc = (struct ath_softc *) common->priv;
 	u8 u8tmp;

 	pci_read_config_byte(to_pci_dev(sc->dev), PCI_CACHE_LINE_SIZE, &u8tmp);
 	*csz = (int)u8tmp;

 	/*
 	 * This check was put in to avoid "unpleasant" consequences if
 	 * the bootrom has not fully initialized all PCI devices.
 	 * Sometimes the cache line size register is not set
 	 */

 	if (*csz == 0)
 		*csz = DEFAULT_CACHELINE >> 2;   /* Use the default size */
 }

 static bool ath_pci_eeprom_read(struct ath_common *common, u32 off, u16 *data)
 {
 	struct ath_softc *sc = (struct ath_softc *) common->priv;
 	struct ath9k_platform_data *pdata = sc->dev->platform_data;

 	if (pdata) {
 		if (off >= (ARRAY_SIZE(pdata->eeprom_data))) {
 			ath_err(common,
 				"%s: eeprom read failed, offset %08x is out of range\n",
 				__func__, off);
 		}

 		*data = pdata->eeprom_data[off];
 	} else {
 		struct ath_hw *ah = (struct ath_hw *) common->ah;

 		common->ops->read(ah, AR5416_EEPROM_OFFSET +
 				      (off << AR5416_EEPROM_S));

 		if (!ath9k_hw_wait(ah,
 				   AR_EEPROM_STATUS_DATA,
 				   AR_EEPROM_STATUS_DATA_BUSY |
 				   AR_EEPROM_STATUS_DATA_PROT_ACCESS, 0,
 				   AH_WAIT_TIMEOUT)) {
 			return false;
 		}

 		*data = MS(common->ops->read(ah, AR_EEPROM_STATUS_DATA),
 			   AR_EEPROM_STATUS_DATA_VAL);
 	}

 	return true;
 }

 /*
  * Bluetooth coexistance requires disabling ASPM.
  */
 static void ath_pci_bt_coex_prep(struct ath_common *common)
 {
 	struct ath_softc *sc = (struct ath_softc *) common->priv;
 	struct pci_dev *pdev = to_pci_dev(sc->dev);
 	u8 aspm;

 	if (!pci_is_pcie(pdev))
 		return;

 	pci_read_config_byte(pdev, ATH_PCIE_CAP_LINK_CTRL, &aspm);
 	aspm &= ~(ATH_PCIE_CAP_LINK_L0S | ATH_PCIE_CAP_LINK_L1);
 	pci_write_config_byte(pdev, ATH_PCIE_CAP_LINK_CTRL, aspm);
 }

 static void ath_pci_extn_synch_enable(struct ath_common *common)
 {
 	struct ath_softc *sc = (struct ath_softc *) common->priv;
 	struct pci_dev *pdev = to_pci_dev(sc->dev);
 	u8 lnkctl;

 	pci_read_config_byte(pdev, sc->sc_ah->caps.pcie_lcr_offset, &lnkctl);
 	lnkctl |= PCI_EXP_LNKCTL_ES;
 	pci_write_config_byte(pdev, sc->sc_ah->caps.pcie_lcr_offset, lnkctl);
 }

 static const struct ath_bus_ops ath_pci_bus_ops = {
 	.ath_bus_type = ATH_PCI,
 	.read_cachesize = ath_pci_read_cachesize,
 	.eeprom_read = ath_pci_eeprom_read,
 	.bt_coex_prep = ath_pci_bt_coex_prep,
 	.extn_synch_en = ath_pci_extn_synch_enable,
 };

 static int ath_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 {
 	void __iomem *mem;
 	struct ath_softc *sc;
 	struct ieee80211_hw *hw;
 	u8 csz;
 	u16 subsysid;
 	u32 val;
 	int ret = 0;
 	char hw_name[64];

 	if (pci_enable_device(pdev))
 		return -EIO;

 	ret =  pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
 	if (ret) {
 		printk(KERN_ERR "ath9k: 32-bit DMA not available\n");
 		goto err_dma;
 	}

 	ret = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
 	if (ret) {
 		printk(KERN_ERR "ath9k: 32-bit DMA consistent "
 			"DMA enable failed\n");
 		goto err_dma;
 	}

 	/*
 	 * Cache line size is used to size and align various
 	 * structures used to communicate with the hardware.
 	 */
 	pci_read_config_byte(pdev, PCI_CACHE_LINE_SIZE, &csz);
 	if (csz == 0) {
 		/*
 		 * Linux 2.4.18 (at least) writes the cache line size
 		 * register as a 16-bit wide register which is wrong.
 		 * We must have this setup properly for rx buffer
 		 * DMA to work so force a reasonable value here if it
 		 * comes up zero.
 		 */
 		csz = L1_CACHE_BYTES / sizeof(u32);
 		pci_write_config_byte(pdev, PCI_CACHE_LINE_SIZE, csz);
 	}
 	/*
 	 * The default setting of latency timer yields poor results,
 	 * set it to the value used by other systems. It may be worth
 	 * tweaking this setting more.
 	 */
 	pci_write_config_byte(pdev, PCI_LATENCY_TIMER, 0xa8);

 	pci_set_master(pdev);

 	/*
 	 * Disable the RETRY_TIMEOUT register (0x41) to keep
 	 * PCI Tx retries from interfering with C3 CPU state.
 	 */
 	pci_read_config_dword(pdev, 0x40, &val);
 	if ((val & 0x0000ff00) != 0)
 		pci_write_config_dword(pdev, 0x40, val & 0xffff00ff);

 	ret = pci_request_region(pdev, 0, "ath9k");
 	if (ret) {
 		dev_err(&pdev->dev, "PCI memory region reserve error\n");
 		ret = -ENODEV;
 		goto err_region;
 	}

 	mem = pci_iomap(pdev, 0, 0);
 	if (!mem) {
 		printk(KERN_ERR "PCI memory map error\n") ;
 		ret = -EIO;
 		goto err_iomap;
 	}

 	hw = ieee80211_alloc_hw(sizeof(struct ath_softc), &ath9k_ops);
 	if (!hw) {
 		dev_err(&pdev->dev, "No memory for ieee80211_hw\n");
 		ret = -ENOMEM;
 		goto err_alloc_hw;
 	}

 	SET_IEEE80211_DEV(hw, &pdev->dev);
 	pci_set_drvdata(pdev, hw);

 	sc = hw->priv;
 	sc->hw = hw;
 	sc->dev = &pdev->dev;
 	sc->mem = mem;

 	/* Will be cleared in ath9k_start() */
 	sc->sc_flags |= SC_OP_INVALID;

 	ret = request_irq(pdev->irq, ath_isr, IRQF_SHARED, "ath9k", sc);
 	if (ret) {
 		dev_err(&pdev->dev, "request_irq failed\n");
 		goto err_irq;
 	}

 	sc->irq = pdev->irq;

 	pci_read_config_word(pdev, PCI_SUBSYSTEM_ID, &subsysid);
 	ret = ath9k_init_device(id->device, sc, subsysid, &ath_pci_bus_ops);
 	if (ret) {
 		dev_err(&pdev->dev, "Failed to initialize device\n");
 		goto err_init;
 	}

 	ath9k_hw_name(sc->sc_ah, hw_name, sizeof(hw_name));
 	wiphy_info(hw->wiphy, "%s mem=0x%lx, irq=%d\n",
 		   hw_name, (unsigned long)mem, pdev->irq);

 	return 0;

 err_init:
 	free_irq(sc->irq, sc);
 err_irq:
 	ieee80211_free_hw(hw);
 err_alloc_hw:
 	pci_iounmap(pdev, mem);
 err_iomap:
 	pci_release_region(pdev, 0);
 err_region:
 	/* Nothing */
 err_dma:
 	pci_disable_device(pdev);
 	return ret;
 }

 static void ath_pci_remove(struct pci_dev *pdev)
 {
 	struct ieee80211_hw *hw = pci_get_drvdata(pdev);
 	struct ath_softc *sc = hw->priv;
 	void __iomem *mem = sc->mem;

 	if (!is_ath9k_unloaded)
 		sc->sc_ah->ah_flags |= AH_UNPLUGGED;
 	ath9k_deinit_device(sc);
 	free_irq(sc->irq, sc);
 	ieee80211_free_hw(sc->hw);

 	pci_iounmap(pdev, mem);
 	pci_disable_device(pdev);
 	pci_release_region(pdev, 0);
 }

 #ifdef CONFIG_PM

 static int ath_pci_suspend(struct device *device)
 {
 	struct pci_dev *pdev = to_pci_dev(device);
 	struct ieee80211_hw *hw = pci_get_drvdata(pdev);
 	struct ath_softc *sc = hw->priv;

 	ath9k_hw_set_gpio(sc->sc_ah, sc->sc_ah->led_pin, 1);

 	return 0;
 }

 static int ath_pci_resume(struct device *device)
 {
 	struct pci_dev *pdev = to_pci_dev(device);
 	struct ieee80211_hw *hw = pci_get_drvdata(pdev);
 	struct ath_softc *sc = hw->priv;
 	u32 val;

 	/*
 	 * Suspend/Resume resets the PCI configuration space, so we have to
 	 * re-disable the RETRY_TIMEOUT register (0x41) to keep
 	 * PCI Tx retries from interfering with C3 CPU state
 	 */
 	pci_read_config_dword(pdev, 0x40, &val);
 	if ((val & 0x0000ff00) != 0)
 		pci_write_config_dword(pdev, 0x40, val & 0xffff00ff);

 	/* Enable LED */
 	ath9k_hw_cfg_output(sc->sc_ah, sc->sc_ah->led_pin,
 			    AR_GPIO_OUTPUT_MUX_AS_OUTPUT);
 	ath9k_hw_set_gpio(sc->sc_ah, sc->sc_ah->led_pin, 1);

 	  /*
 	   * Reset key cache to sane defaults (all entries cleared) instead of
 	   * semi-random values after suspend/resume.
 	   */
 	ath9k_ps_wakeup(sc);
 	ath9k_init_crypto(sc);
 	ath9k_ps_restore(sc);

 	sc->ps_idle = true;
 	ath_radio_disable(sc, hw);

 	return 0;
 }

 static const struct dev_pm_ops ath9k_pm_ops = {
 	.suspend = ath_pci_suspend,
 	.resume = ath_pci_resume,
 	.freeze = ath_pci_suspend,
 	.thaw = ath_pci_resume,
 	.poweroff = ath_pci_suspend,
 	.restore = ath_pci_resume,
 };

 #define ATH9K_PM_OPS	(&ath9k_pm_ops)

 #else /* !CONFIG_PM */

 #define ATH9K_PM_OPS	NULL

 #endif /* !CONFIG_PM */


 MODULE_DEVICE_TABLE(pci, ath_pci_id_table);

 static struct pci_driver ath_pci_driver = {
 	.name       = "ath9k",
 	.id_table   = ath_pci_id_table,
 	.probe      = ath_pci_probe,
 	.remove     = ath_pci_remove,
 	.driver.pm  = ATH9K_PM_OPS,
 };

 int ath_pci_init(void)
 {
 	return pci_register_driver(&ath_pci_driver);
 }

 void ath_pci_exit(void)
 {
 	pci_unregister_driver(&ath_pci_driver);
 }
	/*
	* Copyright (c) 2008-2009 Atheros Communications Inc.
	*
	* Permission to use, copy, modify, and/or distribute this software for any
	* purpose with or without fee is hereby granted, provided that the above
	* copyright notice and this permission notice appear in all copies.
	*
	* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
	* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
	* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
	* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
	* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
	* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
	* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
	*/

	#include <linux/nl80211.h>
	#include <linux/pci.h>
	#include <linux/ath9k_platform.h>
	#include "ath9k.h"

	static DEFINE_PCI_DEVICE_TABLE(ath_pci_id_table) = {
	{ PCI_VDEVICE(ATHEROS, 0x0023) }, /* PCI */
	{ PCI_VDEVICE(ATHEROS, 0x0024) }, /* PCI-E */
	{ PCI_VDEVICE(ATHEROS, 0x0027) }, /* PCI */
	{ PCI_VDEVICE(ATHEROS, 0x0029) }, /* PCI */
	{ PCI_VDEVICE(ATHEROS, 0x002A) }, /* PCI-E */
	{ PCI_VDEVICE(ATHEROS, 0x002B) }, /* PCI-E */
	{ PCI_VDEVICE(ATHEROS, 0x002C) }, /* PCI-E 802.11n bonded out */
	{ PCI_VDEVICE(ATHEROS, 0x002D) }, /* PCI */
	{ PCI_VDEVICE(ATHEROS, 0x002E) }, /* PCI-E */
	{ PCI_VDEVICE(ATHEROS, 0x0030) }, /* PCI-E AR9300 */
	{ PCI_VDEVICE(ATHEROS, 0x0032) }, /* PCI-E AR9485 */
	{ 0 }
	};

	/* return bus cachesize in 4B word units */
	static void ath_pci_read_cachesize(struct ath_common common, int csz)
	{
	struct ath_softc sc = (struct ath_softc ) common->priv;
	u8 u8tmp;

	pci_read_config_byte(to_pci_dev(sc->dev), PCI_CACHE_LINE_SIZE, &u8tmp);
	*csz = (int)u8tmp;

	/*
	* This check was put in to avoid "unpleasant" consequences if
	* the bootrom has not fully initialized all PCI devices.
	* Sometimes the cache line size register is not set
	*/

	if (*csz == 0)
	csz = DEFAULT_CACHELINE >> 2; / Use the default size */
	}

	static bool ath_pci_eeprom_read(struct ath_common common, u32 off, u16 data)
	{
	struct ath_softc sc = (struct ath_softc ) common->priv;
	struct ath9k_platform_data *pdata = sc->dev->platform_data;

	if (pdata) {
	if (off >= (ARRAY_SIZE(pdata->eeprom_data))) {
	ath_err(common,
	"%s: eeprom read failed, offset %08x is out of range\n",
	__func__, off);
	}

	*data = pdata->eeprom_data[off];
	} else {
	struct ath_hw ah = (struct ath_hw ) common->ah;

	common->ops->read(ah, AR5416_EEPROM_OFFSET +
	(off << AR5416_EEPROM_S));

	if (!ath9k_hw_wait(ah,
	AR_EEPROM_STATUS_DATA,
	AR_EEPROM_STATUS_DATA_BUSY \|
	AR_EEPROM_STATUS_DATA_PROT_ACCESS, 0,
	AH_WAIT_TIMEOUT)) {
	return false;
	}

	*data = MS(common->ops->read(ah, AR_EEPROM_STATUS_DATA),
	AR_EEPROM_STATUS_DATA_VAL);
	}

	return true;
	}

	/*
	* Bluetooth coexistance requires disabling ASPM.
	*/
	static void ath_pci_bt_coex_prep(struct ath_common *common)
	{
	struct ath_softc sc = (struct ath_softc ) common->priv;
	struct pci_dev *pdev = to_pci_dev(sc->dev);
	u8 aspm;

	if (!pci_is_pcie(pdev))
	return;

	pci_read_config_byte(pdev, ATH_PCIE_CAP_LINK_CTRL, &aspm);
	aspm &= ~(ATH_PCIE_CAP_LINK_L0S \| ATH_PCIE_CAP_LINK_L1);
	pci_write_config_byte(pdev, ATH_PCIE_CAP_LINK_CTRL, aspm);
	}

	static void ath_pci_extn_synch_enable(struct ath_common *common)
	{
	struct ath_softc sc = (struct ath_softc ) common->priv;
	struct pci_dev *pdev = to_pci_dev(sc->dev);
	u8 lnkctl;

	pci_read_config_byte(pdev, sc->sc_ah->caps.pcie_lcr_offset, &lnkctl);
	lnkctl \|= PCI_EXP_LNKCTL_ES;
	pci_write_config_byte(pdev, sc->sc_ah->caps.pcie_lcr_offset, lnkctl);
	}

	static const struct ath_bus_ops ath_pci_bus_ops = {
	.ath_bus_type = ATH_PCI,
	.read_cachesize = ath_pci_read_cachesize,
	.eeprom_read = ath_pci_eeprom_read,
	.bt_coex_prep = ath_pci_bt_coex_prep,
	.extn_synch_en = ath_pci_extn_synch_enable,
	};

	static int ath_pci_probe(struct pci_dev pdev, const struct pci_device_id id)
	{
	void __iomem *mem;
	struct ath_softc *sc;
	struct ieee80211_hw *hw;
	u8 csz;
	u16 subsysid;
	u32 val;
	int ret = 0;
	char hw_name[64];

	if (pci_enable_device(pdev))
	return -EIO;

	ret = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
	if (ret) {
	printk(KERN_ERR "ath9k: 32-bit DMA not available\n");
	goto err_dma;
	}

	ret = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
	if (ret) {
	printk(KERN_ERR "ath9k: 32-bit DMA consistent "
	"DMA enable failed\n");
	goto err_dma;
	}

	/*
	* Cache line size is used to size and align various
	* structures used to communicate with the hardware.
	*/
	pci_read_config_byte(pdev, PCI_CACHE_LINE_SIZE, &csz);
	if (csz == 0) {
	/*
	* Linux 2.4.18 (at least) writes the cache line size
	* register as a 16-bit wide register which is wrong.
	* We must have this setup properly for rx buffer
	* DMA to work so force a reasonable value here if it
	* comes up zero.
	*/
	csz = L1_CACHE_BYTES / sizeof(u32);
	pci_write_config_byte(pdev, PCI_CACHE_LINE_SIZE, csz);
	}
	/*
	* The default setting of latency timer yields poor results,
	* set it to the value used by other systems. It may be worth
	* tweaking this setting more.
	*/
	pci_write_config_byte(pdev, PCI_LATENCY_TIMER, 0xa8);

	pci_set_master(pdev);

	/*
	* Disable the RETRY_TIMEOUT register (0x41) to keep
	* PCI Tx retries from interfering with C3 CPU state.
	*/
	pci_read_config_dword(pdev, 0x40, &val);
	if ((val & 0x0000ff00) != 0)
	pci_write_config_dword(pdev, 0x40, val & 0xffff00ff);

	ret = pci_request_region(pdev, 0, "ath9k");
	if (ret) {
	dev_err(&pdev->dev, "PCI memory region reserve error\n");
	ret = -ENODEV;
	goto err_region;
	}

	mem = pci_iomap(pdev, 0, 0);
	if (!mem) {
	printk(KERN_ERR "PCI memory map error\n") ;
	ret = -EIO;
	goto err_iomap;
	}

	hw = ieee80211_alloc_hw(sizeof(struct ath_softc), &ath9k_ops);
	if (!hw) {
	dev_err(&pdev->dev, "No memory for ieee80211_hw\n");
	ret = -ENOMEM;
	goto err_alloc_hw;
	}

	SET_IEEE80211_DEV(hw, &pdev->dev);
	pci_set_drvdata(pdev, hw);

	sc = hw->priv;
	sc->hw = hw;
	sc->dev = &pdev->dev;
	sc->mem = mem;

	/* Will be cleared in ath9k_start() */
	sc->sc_flags \|= SC_OP_INVALID;

	ret = request_irq(pdev->irq, ath_isr, IRQF_SHARED, "ath9k", sc);
	if (ret) {
	dev_err(&pdev->dev, "request_irq failed\n");
	goto err_irq;
	}

	sc->irq = pdev->irq;

	pci_read_config_word(pdev, PCI_SUBSYSTEM_ID, &subsysid);
	ret = ath9k_init_device(id->device, sc, subsysid, &ath_pci_bus_ops);
	if (ret) {
	dev_err(&pdev->dev, "Failed to initialize device\n");
	goto err_init;
	}

	ath9k_hw_name(sc->sc_ah, hw_name, sizeof(hw_name));
	wiphy_info(hw->wiphy, "%s mem=0x%lx, irq=%d\n",
	hw_name, (unsigned long)mem, pdev->irq);

	return 0;

	err_init:
	free_irq(sc->irq, sc);
	err_irq:
	ieee80211_free_hw(hw);
	err_alloc_hw:
	pci_iounmap(pdev, mem);
	err_iomap:
	pci_release_region(pdev, 0);
	err_region:
	/* Nothing */
	err_dma:
	pci_disable_device(pdev);
	return ret;
	}

	static void ath_pci_remove(struct pci_dev *pdev)
	{
	struct ieee80211_hw *hw = pci_get_drvdata(pdev);
	struct ath_softc *sc = hw->priv;
	void __iomem *mem = sc->mem;

	if (!is_ath9k_unloaded)
	sc->sc_ah->ah_flags \|= AH_UNPLUGGED;
	ath9k_deinit_device(sc);
	free_irq(sc->irq, sc);
	ieee80211_free_hw(sc->hw);

	pci_iounmap(pdev, mem);
	pci_disable_device(pdev);
	pci_release_region(pdev, 0);
	}

	#ifdef CONFIG_PM

	static int ath_pci_suspend(struct device *device)
	{
	struct pci_dev *pdev = to_pci_dev(device);
	struct ieee80211_hw *hw = pci_get_drvdata(pdev);
	struct ath_softc *sc = hw->priv;

	ath9k_hw_set_gpio(sc->sc_ah, sc->sc_ah->led_pin, 1);

	return 0;
	}

	static int ath_pci_resume(struct device *device)
	{
	struct pci_dev *pdev = to_pci_dev(device);
	struct ieee80211_hw *hw = pci_get_drvdata(pdev);
	struct ath_softc *sc = hw->priv;
	u32 val;

	/*
	* Suspend/Resume resets the PCI configuration space, so we have to
	* re-disable the RETRY_TIMEOUT register (0x41) to keep
	* PCI Tx retries from interfering with C3 CPU state
	*/
	pci_read_config_dword(pdev, 0x40, &val);
	if ((val & 0x0000ff00) != 0)
	pci_write_config_dword(pdev, 0x40, val & 0xffff00ff);

	/* Enable LED */
	ath9k_hw_cfg_output(sc->sc_ah, sc->sc_ah->led_pin,
	AR_GPIO_OUTPUT_MUX_AS_OUTPUT);
	ath9k_hw_set_gpio(sc->sc_ah, sc->sc_ah->led_pin, 1);

	/*
	* Reset key cache to sane defaults (all entries cleared) instead of
	* semi-random values after suspend/resume.
	*/
	ath9k_ps_wakeup(sc);
	ath9k_init_crypto(sc);
	ath9k_ps_restore(sc);

	sc->ps_idle = true;
	ath_radio_disable(sc, hw);

	return 0;
	}

	static const struct dev_pm_ops ath9k_pm_ops = {
	.suspend = ath_pci_suspend,
	.resume = ath_pci_resume,
	.freeze = ath_pci_suspend,
	.thaw = ath_pci_resume,
	.poweroff = ath_pci_suspend,
	.restore = ath_pci_resume,
	};

	#define ATH9K_PM_OPS (&ath9k_pm_ops)

	#else /* !CONFIG_PM */

	#define ATH9K_PM_OPS NULL

	#endif /* !CONFIG_PM */


	MODULE_DEVICE_TABLE(pci, ath_pci_id_table);

	static struct pci_driver ath_pci_driver = {
	.name = "ath9k",
	.id_table = ath_pci_id_table,
	.probe = ath_pci_probe,
	.remove = ath_pci_remove,
	.driver.pm = ATH9K_PM_OPS,
	};

	int ath_pci_init(void)
	{
	return pci_register_driver(&ath_pci_driver);
	}

	void ath_pci_exit(void)
	{
	pci_unregister_driver(&ath_pci_driver);
	}