path: root/drivers/staging/rt2860/pci_main_dev.c

/*
 *************************************************************************
 * Ralink Tech Inc.
 * 5F., No.36, Taiyuan St., Jhubei City,
 * Hsinchu County 302,
 * Taiwan, R.O.C.
 *
 * (c) Copyright 2002-2007, Ralink Technology, Inc.
 *
 * This program is free software; you can redistribute it and/or modify  *
 * it under the terms of the GNU General Public License as published by  *
 * the Free Software Foundation; either version 2 of the License, or     *
 * (at your option) any later version.                                   *
 *                                                                       *
 * This program is distributed in the hope that 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.,                                       *
 * 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
 *                                                                       *
 *************************************************************************

    Module Name:
    pci_main_dev.c

    Abstract:
    Create and register network interface for PCI based chipsets in Linux platform.

    Revision History:
    Who         When            What
    --------    ----------      ----------------------------------------------
*/

#include "rt_config.h"
#include <linux/pci.h>

//
// Function declarations
//
extern int rt28xx_close(IN struct net_device *net_dev);
extern int rt28xx_open(struct net_device *net_dev);

static VOID __devexit rt2860_remove_one(struct pci_dev *pci_dev);
static INT __devinit rt2860_probe(struct pci_dev *pci_dev, const struct pci_device_id  *ent);
static void __exit rt2860_cleanup_module(void);
static int __init rt2860_init_module(void);

 static VOID RTMPInitPCIeDevice(
    IN  struct pci_dev   *pci_dev,
    IN PRTMP_ADAPTER     pAd);

#ifdef CONFIG_PM
static int rt2860_suspend(struct pci_dev *pci_dev, pm_message_t state);
static int rt2860_resume(struct pci_dev *pci_dev);
#endif // CONFIG_PM //

//
// Ralink PCI device table, include all supported chipsets
//
static struct pci_device_id rt2860_pci_tbl[] __devinitdata =
{
	{PCI_DEVICE(NIC_PCI_VENDOR_ID, NIC2860_PCI_DEVICE_ID)},		//RT28602.4G
	{PCI_DEVICE(NIC_PCI_VENDOR_ID, NIC2860_PCIe_DEVICE_ID)},
	{PCI_DEVICE(NIC_PCI_VENDOR_ID, NIC2760_PCI_DEVICE_ID)},
	{PCI_DEVICE(NIC_PCI_VENDOR_ID, NIC2790_PCIe_DEVICE_ID)},
	{PCI_DEVICE(VEN_AWT_PCI_VENDOR_ID, VEN_AWT_PCIe_DEVICE_ID)},
	{PCI_DEVICE(EDIMAX_PCI_VENDOR_ID, 0x7708)},
	{PCI_DEVICE(EDIMAX_PCI_VENDOR_ID, 0x7728)},
	{PCI_DEVICE(EDIMAX_PCI_VENDOR_ID, 0x7758)},
	{PCI_DEVICE(EDIMAX_PCI_VENDOR_ID, 0x7727)},
	{PCI_DEVICE(EDIMAX_PCI_VENDOR_ID, 0x7738)},
	{PCI_DEVICE(EDIMAX_PCI_VENDOR_ID, 0x7748)},
	{PCI_DEVICE(EDIMAX_PCI_VENDOR_ID, 0x7768)},
    {0,}		// terminate list
};

MODULE_DEVICE_TABLE(pci, rt2860_pci_tbl);
MODULE_LICENSE("GPL");
#ifdef MODULE_VERSION
MODULE_VERSION(STA_DRIVER_VERSION);
#endif


//
// Our PCI driver structure
//
static struct pci_driver rt2860_driver =
{
    name:       "rt2860",
    id_table:   rt2860_pci_tbl,
    probe:      rt2860_probe,
    remove:     __devexit_p(rt2860_remove_one),
#ifdef CONFIG_PM
	suspend:	rt2860_suspend,
	resume:		rt2860_resume,
#endif
};


/***************************************************************************
 *
 *	PCI device initialization related procedures.
 *
 ***************************************************************************/
#ifdef CONFIG_PM

VOID RT2860RejectPendingPackets(
	IN	PRTMP_ADAPTER	pAd)
{
	// clear PS packets
	// clear TxSw packets
}

static int rt2860_suspend(
	struct pci_dev *pci_dev,
	pm_message_t state)
{
	struct net_device *net_dev = pci_get_drvdata(pci_dev);
	PRTMP_ADAPTER pAd = (PRTMP_ADAPTER)NULL;
	INT32 retval = 0;


	DBGPRINT(RT_DEBUG_TRACE, ("===> rt2860_suspend()\n"));

	if (net_dev == NULL)
	{
		DBGPRINT(RT_DEBUG_ERROR, ("net_dev == NULL!\n"));
	}
	else
	{
		GET_PAD_FROM_NET_DEV(pAd, net_dev);

		/* we can not use IFF_UP because ra0 down but ra1 up */
		/* and 1 suspend/resume function for 1 module, not for each interface */
		/* so Linux will call suspend/resume function once */
		if (VIRTUAL_IF_NUM(pAd) > 0)
		{
			// avoid users do suspend after interface is down

			// stop interface
			netif_carrier_off(net_dev);
			netif_stop_queue(net_dev);

			// mark device as removed from system and therefore no longer available
			netif_device_detach(net_dev);

			// mark halt flag
			RTMP_SET_FLAG(pAd, fRTMP_ADAPTER_HALT_IN_PROGRESS);
			RTMP_SET_FLAG(pAd, fRTMP_ADAPTER_RADIO_OFF);

			// take down the device
			rt28xx_close((PNET_DEV)net_dev);

			RT_MOD_DEC_USE_COUNT();
		}
	}

	// reference to http://vovo2000.com/type-lab/linux/kernel-api/linux-kernel-api.html
	// enable device to generate PME# when suspended
	// pci_choose_state(): Choose the power state of a PCI device to be suspended
	retval = pci_enable_wake(pci_dev, pci_choose_state(pci_dev, state), 1);
	// save the PCI configuration space of a device before suspending
	pci_save_state(pci_dev);
	// disable PCI device after use
	pci_disable_device(pci_dev);

	retval = pci_set_power_state(pci_dev, pci_choose_state(pci_dev, state));

	DBGPRINT(RT_DEBUG_TRACE, ("<=== rt2860_suspend()\n"));
	return retval;
}

static int rt2860_resume(
	struct pci_dev *pci_dev)
{
	struct net_device *net_dev = pci_get_drvdata(pci_dev);
	PRTMP_ADAPTER pAd = (PRTMP_ADAPTER)NULL;
	INT32 retval;


	// set the power state of a PCI device
	// PCI has 4 power states, DO (normal) ~ D3(less power)
	// in include/linux/pci.h, you can find that
	// #define PCI_D0          ((pci_power_t __force) 0)
	// #define PCI_D1          ((pci_power_t __force) 1)
	// #define PCI_D2          ((pci_power_t __force) 2)
	// #define PCI_D3hot       ((pci_power_t __force) 3)
	// #define PCI_D3cold      ((pci_power_t __force) 4)
	// #define PCI_UNKNOWN     ((pci_power_t __force) 5)
	// #define PCI_POWER_ERROR ((pci_power_t __force) -1)
	retval = pci_set_power_state(pci_dev, PCI_D0);

	// restore the saved state of a PCI device
	pci_restore_state(pci_dev);

	// initialize device before it's used by a driver
	if (pci_enable_device(pci_dev))
	{
		printk("pci enable fail!\n");
		return 0;
	}

	DBGPRINT(RT_DEBUG_TRACE, ("===> rt2860_resume()\n"));

	if (net_dev == NULL)
	{
		DBGPRINT(RT_DEBUG_ERROR, ("net_dev == NULL!\n"));
	}
	else
		GET_PAD_FROM_NET_DEV(pAd, net_dev);

	if (pAd != NULL)
	{
		/* we can not use IFF_UP because ra0 down but ra1 up */
		/* and 1 suspend/resume function for 1 module, not for each interface */
		/* so Linux will call suspend/resume function once */
		if (VIRTUAL_IF_NUM(pAd) > 0)
		{
			// mark device as attached from system and restart if needed
			netif_device_attach(net_dev);

			if (rt28xx_open((PNET_DEV)net_dev) != 0)
			{
				// open fail
				DBGPRINT(RT_DEBUG_TRACE, ("<=== rt2860_resume()\n"));
				return 0;
			}

			// increase MODULE use count
			RT_MOD_INC_USE_COUNT();

			RTMP_CLEAR_FLAG(pAd, fRTMP_ADAPTER_HALT_IN_PROGRESS);
			RTMP_CLEAR_FLAG(pAd, fRTMP_ADAPTER_RADIO_OFF);

			netif_start_queue(net_dev);
			netif_carrier_on(net_dev);
			netif_wake_queue(net_dev);
		}
	}

	DBGPRINT(RT_DEBUG_TRACE, ("<=== rt2860_resume()\n"));
	return 0;
}
#endif // CONFIG_PM //


static INT __init rt2860_init_module(VOID)
{
	return pci_register_driver(&rt2860_driver);
}


//
// Driver module unload function
//
static VOID __exit rt2860_cleanup_module(VOID)
{
    pci_unregister_driver(&rt2860_driver);
}

module_init(rt2860_init_module);
module_exit(rt2860_cleanup_module);


//
// PCI device probe & initialization function
//
static INT __devinit   rt2860_probe(
    IN  struct pci_dev              *pci_dev,
    IN  const struct pci_device_id  *pci_id)
{
	PRTMP_ADAPTER		pAd = (PRTMP_ADAPTER)NULL;
	struct  net_device		*net_dev;
	PVOID				handle;
	PSTRING				print_name;
	ULONG				csr_addr;
	INT rv = 0;
	RTMP_OS_NETDEV_OP_HOOK	netDevHook;

	DBGPRINT(RT_DEBUG_TRACE, ("===> rt2860_probe\n"));

//PCIDevInit==============================================
	// wake up and enable device
	if ((rv = pci_enable_device(pci_dev))!= 0)
	{
		DBGPRINT(RT_DEBUG_ERROR, ("Enable PCI device failed, errno=%d!\n", rv));
		return rv;
	}

	print_name = pci_name(pci_dev);

	if ((rv = pci_request_regions(pci_dev, print_name)) != 0)
	{
		DBGPRINT(RT_DEBUG_ERROR, ("Request PCI resource failed, errno=%d!\n", rv));
		goto err_out;
	}

	// map physical address to virtual address for accessing register
	csr_addr = (unsigned long) ioremap(pci_resource_start(pci_dev, 0), pci_resource_len(pci_dev, 0));
	if (!csr_addr)
	{
		DBGPRINT(RT_DEBUG_ERROR, ("ioremap failed for device %s, region 0x%lX @ 0x%lX\n",
					print_name, (ULONG)pci_resource_len(pci_dev, 0), (ULONG)pci_resource_start(pci_dev, 0)));
		goto err_out_free_res;
	}
	else
	{
		DBGPRINT(RT_DEBUG_TRACE, ("%s: at 0x%lx, VA 0x%lx, IRQ %d. \n",  print_name,
					(ULONG)pci_resource_start(pci_dev, 0), (ULONG)csr_addr, pci_dev->irq));
	}

	// Set DMA master
	pci_set_master(pci_dev);


//RtmpDevInit==============================================
	// Allocate RTMP_ADAPTER adapter structure
	handle = kmalloc(sizeof(struct os_cookie), GFP_KERNEL);
	if (handle == NULL)
	{
		DBGPRINT(RT_DEBUG_ERROR, ("%s(): Allocate memory for os handle failed!\n", __func__));
		goto err_out_iounmap;
	}

	((POS_COOKIE)handle)->pci_dev = pci_dev;

	rv = RTMPAllocAdapterBlock(handle, &pAd);	//shiang: we may need the pci_dev for allocate structure of "RTMP_ADAPTER"
	if (rv != NDIS_STATUS_SUCCESS)
		goto err_out_iounmap;
	// Here are the RTMP_ADAPTER structure with pci-bus specific parameters.
	pAd->CSRBaseAddress = (PUCHAR)csr_addr;
	DBGPRINT(RT_DEBUG_ERROR, ("pAd->CSRBaseAddress =0x%lx, csr_addr=0x%lx!\n", (ULONG)pAd->CSRBaseAddress, csr_addr));
	RtmpRaDevCtrlInit(pAd, RTMP_DEV_INF_PCI);


//NetDevInit==============================================
	net_dev = RtmpPhyNetDevInit(pAd, &netDevHook);
	if (net_dev == NULL)
		goto err_out_free_radev;

	// Here are the net_device structure with pci-bus specific parameters.
	net_dev->irq = pci_dev->irq;		// Interrupt IRQ number
	net_dev->base_addr = csr_addr;		// Save CSR virtual address and irq to device structure
	pci_set_drvdata(pci_dev, net_dev);	// Set driver data

/* for supporting Network Manager */
	/* Set the sysfs physical device reference for the network logical device
	  * if set prior to registration will cause a symlink during initialization.
	 */
	SET_NETDEV_DEV(net_dev, &(pci_dev->dev));


//All done, it's time to register the net device to linux kernel.
	// Register this device
	rv = RtmpOSNetDevAttach(net_dev, &netDevHook);
	if (rv)
		goto err_out_free_netdev;

	pAd->StaCfg.OriDevType = net_dev->type;
	RTMPInitPCIeDevice(pci_dev, pAd);

#ifdef KTHREAD_SUPPORT
#endif // KTHREAD_SUPPORT //

	DBGPRINT(RT_DEBUG_TRACE, ("<=== rt2860_probe\n"));

	return 0; // probe ok


	/* --------------------------- ERROR HANDLE --------------------------- */
err_out_free_netdev:
	RtmpOSNetDevFree(net_dev);

err_out_free_radev:
	/* free RTMP_ADAPTER strcuture and os_cookie*/
	RTMPFreeAdapter(pAd);

err_out_iounmap:
	iounmap((void *)(csr_addr));
	release_mem_region(pci_resource_start(pci_dev, 0), pci_resource_len(pci_dev, 0));

err_out_free_res:
	pci_release_regions(pci_dev);

err_out:
	pci_disable_device(pci_dev);

	DBGPRINT(RT_DEBUG_ERROR, ("<=== rt2860_probe failed with rv = %d!\n", rv));

	return -ENODEV; /* probe fail */
}


static VOID __devexit rt2860_remove_one(
    IN  struct pci_dev  *pci_dev)
{
	PNET_DEV	net_dev = pci_get_drvdata(pci_dev);
	RTMP_ADAPTER	*pAd = NULL;
	ULONG			csr_addr = net_dev->base_addr; // pAd->CSRBaseAddress;

	GET_PAD_FROM_NET_DEV(pAd, net_dev);

    DBGPRINT(RT_DEBUG_TRACE, ("===> rt2860_remove_one\n"));

	if (pAd != NULL)
	{
		// Unregister/Free all allocated net_device.
		RtmpPhyNetDevExit(pAd, net_dev);

		// Unmap CSR base address
		iounmap((char *)(csr_addr));

		// release memory region
		release_mem_region(pci_resource_start(pci_dev, 0), pci_resource_len(pci_dev, 0));

		// Free RTMP_ADAPTER related structures.
		RtmpRaDevCtrlExit(pAd);

	}
	else
	{
		// Unregister network device
		RtmpOSNetDevDetach(net_dev);

		// Unmap CSR base address
		iounmap((char *)(net_dev->base_addr));

		// release memory region
		release_mem_region(pci_resource_start(pci_dev, 0), pci_resource_len(pci_dev, 0));
	}

	// Free the root net_device
	RtmpOSNetDevFree(net_dev);

}


/*
========================================================================
Routine Description:
    Check the chipset vendor/product ID.

Arguments:
    _dev_p				Point to the PCI or USB device

Return Value:
    TRUE				Check ok
	FALSE				Check fail

Note:
========================================================================
*/
BOOLEAN RT28XXChipsetCheck(
	IN void *_dev_p)
{
	/* always TRUE */
	return TRUE;
}


/***************************************************************************
 *
 *	PCIe device initialization related procedures.
 *
 ***************************************************************************/
 static VOID RTMPInitPCIeDevice(
    IN  struct pci_dev   *pci_dev,
    IN PRTMP_ADAPTER     pAd)
{
	USHORT  device_id;
	POS_COOKIE pObj;

	pObj = (POS_COOKIE) pAd->OS_Cookie;
	pci_read_config_word(pci_dev, PCI_DEVICE_ID, &device_id);
	device_id = le2cpu16(device_id);
	pObj->DeviceID = device_id;
	OPSTATUS_CLEAR_FLAG(pAd, fOP_STATUS_ADVANCE_POWER_SAVE_PCIE_DEVICE);
	if (
		(device_id == NIC2860_PCIe_DEVICE_ID) ||
		(device_id == NIC2790_PCIe_DEVICE_ID) ||
		(device_id == VEN_AWT_PCIe_DEVICE_ID) ||
		 0)
	{
		UINT32 MacCsr0 = 0, Index= 0;
		do
		{
			RTMP_IO_READ32(pAd, MAC_CSR0, &MacCsr0);

			if ((MacCsr0 != 0x00) && (MacCsr0 != 0xFFFFFFFF))
				break;

			RTMPusecDelay(10);
		} while (Index++ < 100);

		// Support advanced power save after 2892/2790.
		// MAC version at offset 0x1000 is 0x2872XXXX/0x2870XXXX(PCIe, USB, SDIO).
		if ((MacCsr0&0xffff0000) != 0x28600000)
		{
			OPSTATUS_SET_FLAG(pAd, fOP_STATUS_ADVANCE_POWER_SAVE_PCIE_DEVICE);
		}
	}
}


VOID RTMPInitPCIeLinkCtrlValue(
	IN	PRTMP_ADAPTER	pAd)
{
    INT     pos;
    USHORT	reg16, data2, PCIePowerSaveLevel, Configuration;
    BOOLEAN	bFindIntel = FALSE;
	POS_COOKIE pObj;

	pObj = (POS_COOKIE) pAd->OS_Cookie;

	if (!OPSTATUS_TEST_FLAG(pAd, fOP_STATUS_ADVANCE_POWER_SAVE_PCIE_DEVICE))
		return;

    DBGPRINT(RT_DEBUG_TRACE, ("%s.===>\n", __func__));
	// Init EEPROM, and save settings
	if (!IS_RT3090(pAd))
	{
		RT28xx_EEPROM_READ16(pAd, 0x22, PCIePowerSaveLevel);
		pAd->PCIePowerSaveLevel = PCIePowerSaveLevel & 0xff;

		if ((PCIePowerSaveLevel&0xff) == 0xff)
		{
			OPSTATUS_CLEAR_FLAG(pAd, fOP_STATUS_ADVANCE_POWER_SAVE_PCIE_DEVICE);
			DBGPRINT(RT_DEBUG_TRACE, ("====> PCIePowerSaveLevel = 0x%x.\n", PCIePowerSaveLevel));
			return;
		}
	else
	{
		PCIePowerSaveLevel &= 0x3;
		RT28xx_EEPROM_READ16(pAd, 0x24, data2);

		if( !(((data2&0xff00) == 0x9200) && ((data2&0x80) !=0)) )
		{
			if (PCIePowerSaveLevel > 1 )
				PCIePowerSaveLevel = 1;
		}

		DBGPRINT(RT_DEBUG_TRACE, ("====> Write 0x83 = 0x%x.\n", PCIePowerSaveLevel));
		AsicSendCommandToMcu(pAd, 0x83, 0xff, (UCHAR)PCIePowerSaveLevel, 0x00);
		RT28xx_EEPROM_READ16(pAd, 0x22, PCIePowerSaveLevel);
		PCIePowerSaveLevel &= 0xff;
		PCIePowerSaveLevel = PCIePowerSaveLevel >> 6;
		switch(PCIePowerSaveLevel)
		{
				case 0:	// Only support L0
					pAd->LnkCtrlBitMask = 0;
				break;
				case 1:	// Only enable L0s
					pAd->LnkCtrlBitMask = 1;
				break;
				case 2:	// enable L1, L0s
					pAd->LnkCtrlBitMask = 3;
				break;
				case 3:	// sync with host clk and enable L1, L0s
				pAd->LnkCtrlBitMask = 0x103;
				break;
		}
		DBGPRINT(RT_DEBUG_TRACE, ("====> LnkCtrlBitMask = 0x%x.\n", pAd->LnkCtrlBitMask));
	}
	}
	else if (IS_RT3090(pAd))
	{
		// 1. read setting from inf file.
		// .....
		USHORT	PCIePowerSetting = 0;
		/* code from windows, default value of rt30xxPowerMode = 0
		PCIePowerSetting = pAd->StaCfg.PSControl.field.rt30xxPowerMode;
		*/
		DBGPRINT(RT_DEBUG_TRACE, ("====> rt30xx Read PowerLevelMode =  0x%x.\n", PCIePowerSetting));
		// 2. Check EnableNewPS
		/*
		if (pAd->StaCfg.PSControl.field.EnableNewPS == FALSE)
			PCIePowerSetting = 1;
		*/

		if ((pAd->MACVersion&0xffff) <= 0x0211)
		{
			// Chip Version E only allow 1
			PCIePowerSetting = 1;
			DBGPRINT(RT_DEBUG_TRACE, ("====> rt30xx Write 0x83 Command = 0x%x.\n", PCIePowerSetting));
			AsicSendCommandToMcu(pAd, 0x83, 0xff, (UCHAR)PCIePowerSetting, 0x00);
		}
		else
		{
			// Chip Version F only allow 1 or 2
			if ((PCIePowerSetting > 2) || (PCIePowerSetting == 0))
				PCIePowerSetting = 1;
			DBGPRINT(RT_DEBUG_TRACE, ("====> rt30xx Write 0x83 Command = 0x%x.\n", PCIePowerSetting));
			AsicSendCommandToMcu(pAd, 0x83, 0xff, (UCHAR)PCIePowerSetting, 0x00);
		}

	}

    // Find Ralink PCIe Device's Express Capability Offset
	pos = pci_find_capability(pObj->pci_dev, PCI_CAP_ID_EXP);

    if (pos != 0)
    {
        // Ralink PCIe Device's Link Control Register Offset
        pAd->RLnkCtrlOffset = pos + PCI_EXP_LNKCTL;
	pci_read_config_word(pObj->pci_dev, pAd->RLnkCtrlOffset, &reg16);
        Configuration = le2cpu16(reg16);
        DBGPRINT(RT_DEBUG_TRACE, ("Read (Ralink PCIe Link Control Register) offset 0x%x = 0x%x\n",
                                    pAd->RLnkCtrlOffset, Configuration));
        pAd->RLnkCtrlConfiguration = (Configuration & 0x103);
        Configuration &= 0xfefc;
        Configuration |= (0x0);
		if ((pObj->DeviceID == NIC2860_PCIe_DEVICE_ID)
			||(pObj->DeviceID == NIC2790_PCIe_DEVICE_ID))
		{
			reg16 = cpu2le16(Configuration);
			pci_write_config_word(pObj->pci_dev, pAd->RLnkCtrlOffset, reg16);
			DBGPRINT(RT_DEBUG_TRACE, ("Write (Ralink PCIe Link Control Register)  offset 0x%x = 0x%x\n",
                                    pos + PCI_EXP_LNKCTL, Configuration));
		}

        RTMPFindHostPCIDev(pAd);
        if (pObj->parent_pci_dev)
        {
		USHORT  vendor_id;

		pci_read_config_word(pObj->parent_pci_dev, PCI_VENDOR_ID, &vendor_id);
		vendor_id = le2cpu16(vendor_id);
		if (vendor_id == PCIBUS_INTEL_VENDOR)
			bFindIntel = TRUE;

		// Find PCI-to-PCI Bridge Express Capability Offset
		pos = pci_find_capability(pObj->parent_pci_dev, PCI_CAP_ID_EXP);

		if (pos != 0)
		{
			BOOLEAN		bChange = FALSE;
			// PCI-to-PCI Bridge Link Control Register Offset
			pAd->HostLnkCtrlOffset = pos + PCI_EXP_LNKCTL;
			pci_read_config_word(pObj->parent_pci_dev, pAd->HostLnkCtrlOffset, &reg16);
			Configuration = le2cpu16(reg16);
			DBGPRINT(RT_DEBUG_TRACE, ("Read (Host PCI-to-PCI Bridge Link Control Register) offset 0x%x = 0x%x\n",
			                            pAd->HostLnkCtrlOffset, Configuration));
			pAd->HostLnkCtrlConfiguration = (Configuration & 0x103);
			Configuration &= 0xfefc;
			Configuration |= (0x0);

			switch (pObj->DeviceID)
			{
				case NIC2860_PCIe_DEVICE_ID:
				case NIC2790_PCIe_DEVICE_ID:
					bChange = TRUE;
					break;
				default:
					break;
			}

			if (bChange)
			{
				reg16 = cpu2le16(Configuration);
				pci_write_config_word(pObj->parent_pci_dev, pAd->HostLnkCtrlOffset, reg16);
				DBGPRINT(RT_DEBUG_TRACE, ("Write (Host PCI-to-PCI Bridge Link Control Register) offset 0x%x = 0x%x\n",
						pAd->HostLnkCtrlOffset, Configuration));
			}
		}
		else
		{
			pAd->HostLnkCtrlOffset = 0;
			DBGPRINT(RT_DEBUG_ERROR, ("%s: cannot find PCI-to-PCI Bridge PCI Express Capability!\n", __func__));
		}
        }
    }
    else
    {
        pAd->RLnkCtrlOffset = 0;
        pAd->HostLnkCtrlOffset = 0;
        DBGPRINT(RT_DEBUG_ERROR, ("%s: cannot find Ralink PCIe Device's PCI Express Capability!\n", __func__));
    }

    if (bFindIntel == FALSE)
	{
		DBGPRINT(RT_DEBUG_TRACE, ("Doesn't find Intel PCI host controller. \n"));
		// Doesn't switch L0, L1, So set PCIePowerSaveLevel to 0xff
		pAd->PCIePowerSaveLevel = 0xff;
		if ((pAd->RLnkCtrlOffset != 0)
		)
		{
			pci_read_config_word(pObj->pci_dev, pAd->RLnkCtrlOffset, &reg16);
			Configuration = le2cpu16(reg16);
			DBGPRINT(RT_DEBUG_TRACE, ("Read (Ralink 30xx PCIe Link Control Register) offset 0x%x = 0x%x\n",
			                        pAd->RLnkCtrlOffset, Configuration));
			pAd->RLnkCtrlConfiguration = (Configuration & 0x103);
			Configuration &= 0xfefc;
			Configuration |= (0x0);
			reg16 = cpu2le16(Configuration);
			pci_write_config_word(pObj->pci_dev, pAd->RLnkCtrlOffset, reg16);
			DBGPRINT(RT_DEBUG_TRACE, ("Write (Ralink PCIe Link Control Register)  offset 0x%x = 0x%x\n",
			                        pos + PCI_EXP_LNKCTL, Configuration));
		}
	}
}

VOID RTMPFindHostPCIDev(
    IN	PRTMP_ADAPTER	pAd)
{
    USHORT  reg16;
    UCHAR   reg8;
	UINT	DevFn;
    PPCI_DEV    pPci_dev;
	POS_COOKIE	pObj;

	pObj = (POS_COOKIE) pAd->OS_Cookie;

	if (!OPSTATUS_TEST_FLAG(pAd, fOP_STATUS_ADVANCE_POWER_SAVE_PCIE_DEVICE))
		return;

    DBGPRINT(RT_DEBUG_TRACE, ("%s.===>\n", __func__));

    pObj->parent_pci_dev = NULL;
    if (pObj->pci_dev->bus->parent)
    {
        for (DevFn = 0; DevFn < 255; DevFn++)
        {
            pPci_dev = pci_get_slot(pObj->pci_dev->bus->parent, DevFn);
            if (pPci_dev)
            {
                pci_read_config_word(pPci_dev, PCI_CLASS_DEVICE, &reg16);
                reg16 = le2cpu16(reg16);
                pci_read_config_byte(pPci_dev, PCI_CB_CARD_BUS, &reg8);
                if ((reg16 == PCI_CLASS_BRIDGE_PCI) &&
                    (reg8 == pObj->pci_dev->bus->number))
                {
                    pObj->parent_pci_dev = pPci_dev;
                }
            }
        }
    }
}

/*
	========================================================================

	Routine Description:

	Arguments:
		Level = RESTORE_HALT : Restore PCI host and Ralink PCIe Link Control field to its default value.
		Level = Other Value : Restore from dot11 power save or radio off status. And force PCI host Link Control fields to 0x1

	========================================================================
*/
VOID RTMPPCIeLinkCtrlValueRestore(
	IN	PRTMP_ADAPTER	pAd,
	IN   UCHAR		Level)
{
	USHORT  PCIePowerSaveLevel, reg16;
	USHORT	Configuration;
	POS_COOKIE	pObj;

	pObj = (POS_COOKIE) pAd->OS_Cookie;

	if (!OPSTATUS_TEST_FLAG(pAd, fOP_STATUS_ADVANCE_POWER_SAVE_PCIE_DEVICE))
		return;

	if (!((pObj->DeviceID == NIC2860_PCIe_DEVICE_ID)
		||(pObj->DeviceID == NIC2790_PCIe_DEVICE_ID)))
		return;

	DBGPRINT(RT_DEBUG_TRACE, ("%s.===>\n", __func__));
	PCIePowerSaveLevel = pAd->PCIePowerSaveLevel;
	if ((PCIePowerSaveLevel&0xff) == 0xff)
	{
		DBGPRINT(RT_DEBUG_TRACE,("return  \n"));
		return;
	}

	if (pObj->parent_pci_dev && (pAd->HostLnkCtrlOffset != 0))
    {
        PCI_REG_READ_WORD(pObj->parent_pci_dev, pAd->HostLnkCtrlOffset, Configuration);
        if ((Configuration != 0) &&
            (Configuration != 0xFFFF))
        {
		Configuration &= 0xfefc;
		// If call from interface down, restore to orginial setting.
		if (Level == RESTORE_CLOSE)
		{
			Configuration |= pAd->HostLnkCtrlConfiguration;
		}
		else
			Configuration |= 0x0;
            PCI_REG_WIRTE_WORD(pObj->parent_pci_dev, pAd->HostLnkCtrlOffset, Configuration);
		DBGPRINT(RT_DEBUG_TRACE, ("Restore PCI host : offset 0x%x = 0x%x\n", pAd->HostLnkCtrlOffset, Configuration));
        }
        else
            DBGPRINT(RT_DEBUG_ERROR, ("Restore PCI host : PCI_REG_READ_WORD failed (Configuration = 0x%x)\n", Configuration));
    }

    if (pObj->pci_dev && (pAd->RLnkCtrlOffset != 0))
    {
        PCI_REG_READ_WORD(pObj->pci_dev, pAd->RLnkCtrlOffset, Configuration);
        if ((Configuration != 0) &&
            (Configuration != 0xFFFF))
        {
		Configuration &= 0xfefc;
			// If call from interface down, restore to orginial setting.
			if (Level == RESTORE_CLOSE)
		Configuration |= pAd->RLnkCtrlConfiguration;
			else
				Configuration |= 0x0;
            PCI_REG_WIRTE_WORD(pObj->pci_dev, pAd->RLnkCtrlOffset, Configuration);
		DBGPRINT(RT_DEBUG_TRACE, ("Restore Ralink : offset 0x%x = 0x%x\n", pAd->RLnkCtrlOffset, Configuration));
        }
        else
            DBGPRINT(RT_DEBUG_ERROR, ("Restore Ralink : PCI_REG_READ_WORD failed (Configuration = 0x%x)\n", Configuration));
	}

	DBGPRINT(RT_DEBUG_TRACE,("%s <===\n", __func__));
}

/*
	========================================================================

	Routine Description:

	Arguments:
		Max : limit Host PCI and Ralink PCIe device's LINK CONTROL field's value.
		Because now frequently set our device to mode 1 or mode 3 will cause problem.

	========================================================================
*/
VOID RTMPPCIeLinkCtrlSetting(
	IN	PRTMP_ADAPTER	pAd,
	IN	USHORT		Max)
{
	USHORT  PCIePowerSaveLevel, reg16;
	USHORT	Configuration;
	POS_COOKIE	pObj;

	pObj = (POS_COOKIE) pAd->OS_Cookie;

	if (!OPSTATUS_TEST_FLAG(pAd, fOP_STATUS_ADVANCE_POWER_SAVE_PCIE_DEVICE))
		return;

	if (!((pObj->DeviceID == NIC2860_PCIe_DEVICE_ID)
		||(pObj->DeviceID == NIC2790_PCIe_DEVICE_ID)))
		return;

	DBGPRINT(RT_DEBUG_TRACE,("%s===>\n", __func__));
	PCIePowerSaveLevel = pAd->PCIePowerSaveLevel;
	if ((PCIePowerSaveLevel&0xff) == 0xff)
	{
		DBGPRINT(RT_DEBUG_TRACE,("return  \n"));
		return;
	}
	PCIePowerSaveLevel = PCIePowerSaveLevel>>6;


	if (pObj->pci_dev && (pAd->RLnkCtrlOffset != 0))
	{
		// first 2892 chip not allow to frequently set mode 3. will cause hang problem.
		if (PCIePowerSaveLevel > Max)
			PCIePowerSaveLevel = Max;

        PCI_REG_READ_WORD(pObj->pci_dev, pAd->RLnkCtrlOffset, Configuration);
		Configuration |= 0x100;
        PCI_REG_WIRTE_WORD(pObj->pci_dev, pAd->RLnkCtrlOffset, Configuration);
		DBGPRINT(RT_DEBUG_TRACE, ("Write Ralink device : offset 0x%x = 0x%x\n", pAd->RLnkCtrlOffset, Configuration));
	}

	DBGPRINT(RT_DEBUG_TRACE,("RTMPPCIePowerLinkCtrl <==============\n"));
}