drivers/gpu/drm/radeon/radeon_agp.c - maze/linux - Git at Google

 /*
  * Copyright 2008 Red Hat Inc.
  * Copyright 2009 Jerome Glisse.
  *
  * Permission is hereby granted, free of charge, to any person obtaining a
  * copy of this software and associated documentation files (the "Software"),
  * to deal in the Software without restriction, including without limitation
  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  * and/or sell copies of the Software, and to permit persons to whom the
  * Software is furnished to do so, subject to the following conditions:
  *
  * The above copyright notice and this permission notice shall be included in
  * all copies or substantial portions of the Software.
  *
  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  * OTHER DEALINGS IN THE SOFTWARE.
  *
  * Authors:
  *    Dave Airlie
  *    Jerome Glisse <glisse@freedesktop.org>
  */
 #include "drmP.h"
 #include "drm.h"
 #include "radeon.h"
 #include "radeon_drm.h"

 #if __OS_HAS_AGP

 struct radeon_agpmode_quirk {
 	u32 hostbridge_vendor;
 	u32 hostbridge_device;
 	u32 chip_vendor;
 	u32 chip_device;
 	u32 subsys_vendor;
 	u32 subsys_device;
 	u32 default_mode;
 };

 static struct radeon_agpmode_quirk radeon_agpmode_quirk_list[] = {
 	/* Intel E7505 Memory Controller Hub / RV350 AR [Radeon 9600XT] Needs AGPMode 4 (deb #515326) */
 	{ PCI_VENDOR_ID_INTEL, 0x2550, PCI_VENDOR_ID_ATI, 0x4152, 0x1458, 0x4038, 4},
 	/* Intel 82865G/PE/P DRAM Controller/Host-Hub / Mobility 9800 Needs AGPMode 4 (deb #462590) */
 	{ PCI_VENDOR_ID_INTEL, 0x2570, PCI_VENDOR_ID_ATI, 0x4a4e, PCI_VENDOR_ID_DELL, 0x5106, 4},
 	/* Intel 82865G/PE/P DRAM Controller/Host-Hub / RV280 [Radeon 9200 SE] Needs AGPMode 4 (lp #300304) */
 	{ PCI_VENDOR_ID_INTEL, 0x2570, PCI_VENDOR_ID_ATI, 0x5964,
 		0x148c, 0x2073, 4},
 	/* Intel 82855PM Processor to I/O Controller / Mobility M6 LY Needs AGPMode 1 (deb #467235) */
 	{ PCI_VENDOR_ID_INTEL, 0x3340, PCI_VENDOR_ID_ATI, 0x4c59,
 		PCI_VENDOR_ID_IBM, 0x052f, 1},
 	/* Intel 82855PM host bridge / Mobility 9600 M10 RV350 Needs AGPMode 1 (lp #195051) */
 	{ PCI_VENDOR_ID_INTEL, 0x3340, PCI_VENDOR_ID_ATI, 0x4e50,
 		PCI_VENDOR_ID_IBM, 0x0550, 1},
 	/* Intel 82855PM host bridge / Mobility M7 needs AGPMode 1 */
 	{ PCI_VENDOR_ID_INTEL, 0x3340, PCI_VENDOR_ID_ATI, 0x4c57,
 		PCI_VENDOR_ID_IBM, 0x0530, 1},
 	/* Intel 82855PM host bridge / FireGL Mobility T2 RV350 Needs AGPMode 2 (fdo #20647) */
 	{ PCI_VENDOR_ID_INTEL, 0x3340, PCI_VENDOR_ID_ATI, 0x4e54,
 		PCI_VENDOR_ID_IBM, 0x054f, 2},
 	/* Intel 82855PM host bridge / Mobility M9+ / VaioPCG-V505DX Needs AGPMode 2 (fdo #17928) */
 	{ PCI_VENDOR_ID_INTEL, 0x3340, PCI_VENDOR_ID_ATI, 0x5c61,
 		PCI_VENDOR_ID_SONY, 0x816b, 2},
 	/* Intel 82855PM Processor to I/O Controller / Mobility M9+ Needs AGPMode 8 (phoronix forum) */
 	{ PCI_VENDOR_ID_INTEL, 0x3340, PCI_VENDOR_ID_ATI, 0x5c61,
 		PCI_VENDOR_ID_SONY, 0x8195, 8},
 	/* Intel 82830 830 Chipset Host Bridge / Mobility M6 LY Needs AGPMode 2 (fdo #17360)*/
 	{ PCI_VENDOR_ID_INTEL, 0x3575, PCI_VENDOR_ID_ATI, 0x4c59,
 		PCI_VENDOR_ID_DELL, 0x00e3, 2},
 	/* Intel 82852/82855 host bridge / Mobility FireGL 9000 R250 Needs AGPMode 1 (lp #296617) */
 	{ PCI_VENDOR_ID_INTEL, 0x3580, PCI_VENDOR_ID_ATI, 0x4c66,
 		PCI_VENDOR_ID_DELL, 0x0149, 1},
 	/* Intel 82852/82855 host bridge / Mobility 9600 M10 RV350 Needs AGPMode 1 (deb #467460) */
 	{ PCI_VENDOR_ID_INTEL, 0x3580, PCI_VENDOR_ID_ATI, 0x4e50,
 		0x1025, 0x0061, 1},
 	/* Intel 82852/82855 host bridge / Mobility 9600 M10 RV350 Needs AGPMode 1 (lp #203007) */
 	{ PCI_VENDOR_ID_INTEL, 0x3580, PCI_VENDOR_ID_ATI, 0x4e50,
 		0x1025, 0x0064, 1},
 	/* Intel 82852/82855 host bridge / Mobility 9600 M10 RV350 Needs AGPMode 1 (lp #141551) */
 	{ PCI_VENDOR_ID_INTEL, 0x3580, PCI_VENDOR_ID_ATI, 0x4e50,
 		PCI_VENDOR_ID_ASUSTEK, 0x1942, 1},
 	/* Intel 82852/82855 host bridge / Mobility 9600/9700 Needs AGPMode 1 (deb #510208) */
 	{ PCI_VENDOR_ID_INTEL, 0x3580, PCI_VENDOR_ID_ATI, 0x4e50,
 		0x10cf, 0x127f, 1},
 	/* ASRock K7VT4A+ AGP 8x / ATI Radeon 9250 AGP Needs AGPMode 4 (lp #133192) */
 	{ 0x1849, 0x3189, PCI_VENDOR_ID_ATI, 0x5960,
 		0x1787, 0x5960, 4},
 	/* VIA K8M800 Host Bridge / RV280 [Radeon 9200 PRO] Needs AGPMode 4 (fdo #12544) */
 	{ PCI_VENDOR_ID_VIA, 0x0204, PCI_VENDOR_ID_ATI, 0x5960,
 		0x17af, 0x2020, 4},
 	/* VIA KT880 Host Bridge / RV350 [Radeon 9550] Needs AGPMode 4 (fdo #19981) */
 	{ PCI_VENDOR_ID_VIA, 0x0269, PCI_VENDOR_ID_ATI, 0x4153,
 		PCI_VENDOR_ID_ASUSTEK, 0x003c, 4},
 	/* VIA VT8363 Host Bridge / R200 QL [Radeon 8500] Needs AGPMode 2 (lp #141551) */
 	{ PCI_VENDOR_ID_VIA, 0x0305, PCI_VENDOR_ID_ATI, 0x514c,
 		PCI_VENDOR_ID_ATI, 0x013a, 2},
 	/* VIA VT82C693A Host Bridge / RV280 [Radeon 9200 PRO] Needs AGPMode 2 (deb #515512) */
 	{ PCI_VENDOR_ID_VIA, 0x0691, PCI_VENDOR_ID_ATI, 0x5960,
 		PCI_VENDOR_ID_ASUSTEK, 0x004c, 2},
 	/* VIA VT82C693A Host Bridge / RV280 [Radeon 9200 PRO] Needs AGPMode 2 */
 	{ PCI_VENDOR_ID_VIA, 0x0691, PCI_VENDOR_ID_ATI, 0x5960,
 		PCI_VENDOR_ID_ASUSTEK, 0x0054, 2},
 	/* VIA VT8377 Host Bridge / R200 QM [Radeon 9100] Needs AGPMode 4 (deb #461144) */
 	{ PCI_VENDOR_ID_VIA, 0x3189, PCI_VENDOR_ID_ATI, 0x514d,
 		0x174b, 0x7149, 4},
 	/* VIA VT8377 Host Bridge / RV280 [Radeon 9200 PRO] Needs AGPMode 4 (lp #312693) */
 	{ PCI_VENDOR_ID_VIA, 0x3189, PCI_VENDOR_ID_ATI, 0x5960,
 		0x1462, 0x0380, 4},
 	/* VIA VT8377 Host Bridge / RV280 Needs AGPMode 4 (ati ML) */
 	{ PCI_VENDOR_ID_VIA, 0x3189, PCI_VENDOR_ID_ATI, 0x5964,
 		0x148c, 0x2073, 4},
 	/* ATI Host Bridge / RV280 [M9+] Needs AGPMode 1 (phoronix forum) */
 	{ PCI_VENDOR_ID_ATI, 0xcbb2, PCI_VENDOR_ID_ATI, 0x5c61,
 		PCI_VENDOR_ID_SONY, 0x8175, 1},
 	/* HP Host Bridge / R300 [FireGL X1] Needs AGPMode 2 (fdo #7770) */
 	{ PCI_VENDOR_ID_HP, 0x122e, PCI_VENDOR_ID_ATI, 0x4e47,
 		PCI_VENDOR_ID_ATI, 0x0152, 2},
 	{ 0, 0, 0, 0, 0, 0, 0 },
 };
 #endif

 int radeon_agp_init(struct radeon_device *rdev)
 {
 #if __OS_HAS_AGP
 	struct radeon_agpmode_quirk *p = radeon_agpmode_quirk_list;
 	struct drm_agp_mode mode;
 	struct drm_agp_info info;
 	uint32_t agp_status;
 	int default_mode;
 	bool is_v3;
 	int ret;

 	if (rdev->ddev->agp->agp_info.aper_size < 32) {
 		dev_warn(rdev->dev, "AGP aperture to small (%dM) "
 			"need at least 32M, disabling AGP\n",
 			rdev->ddev->agp->agp_info.aper_size);
 		return -EINVAL;
 	}

 	/* Acquire AGP. */
 	if (!rdev->ddev->agp->acquired) {
 		ret = drm_agp_acquire(rdev->ddev);
 		if (ret) {
 			DRM_ERROR("Unable to acquire AGP: %d\n", ret);
 			return ret;
 		}
 	}

 	ret = drm_agp_info(rdev->ddev, &info);
 	if (ret) {
 		DRM_ERROR("Unable to get AGP info: %d\n", ret);
 		return ret;
 	}
 	mode.mode = info.mode;
 	agp_status = (RREG32(RADEON_AGP_STATUS) | RADEON_AGPv3_MODE) & mode.mode;
 	is_v3 = !!(agp_status & RADEON_AGPv3_MODE);

 	if (is_v3) {
 		default_mode = (agp_status & RADEON_AGPv3_8X_MODE) ? 8 : 4;
 	} else {
 		if (agp_status & RADEON_AGP_4X_MODE) {
 			default_mode = 4;
 		} else if (agp_status & RADEON_AGP_2X_MODE) {
 			default_mode = 2;
 		} else {
 			default_mode = 1;
 		}
 	}

 	/* Apply AGPMode Quirks */
 	while (p && p->chip_device != 0) {
 		if (info.id_vendor == p->hostbridge_vendor &&
 		    info.id_device == p->hostbridge_device &&
 		    rdev->pdev->vendor == p->chip_vendor &&
 		    rdev->pdev->device == p->chip_device &&
 		    rdev->pdev->subsystem_vendor == p->subsys_vendor &&
 		    rdev->pdev->subsystem_device == p->subsys_device) {
 			default_mode = p->default_mode;
 		}
 		++p;
 	}

 	if (radeon_agpmode > 0) {
 		if ((radeon_agpmode < (is_v3 ? 4 : 1)) ||
 		    (radeon_agpmode > (is_v3 ? 8 : 4)) ||
 		    (radeon_agpmode & (radeon_agpmode - 1))) {
 			DRM_ERROR("Illegal AGP Mode: %d (valid %s), leaving at %d\n",
 				  radeon_agpmode, is_v3 ? "4, 8" : "1, 2, 4",
 				  default_mode);
 			radeon_agpmode = default_mode;
 		} else {
 			DRM_INFO("AGP mode requested: %d\n", radeon_agpmode);
 		}
 	} else {
 		radeon_agpmode = default_mode;
 	}

 	mode.mode &= ~RADEON_AGP_MODE_MASK;
 	if (is_v3) {
 		switch (radeon_agpmode) {
 		case 8:
 			mode.mode |= RADEON_AGPv3_8X_MODE;
 			break;
 		case 4:
 		default:
 			mode.mode |= RADEON_AGPv3_4X_MODE;
 			break;
 		}
 	} else {
 		switch (radeon_agpmode) {
 		case 4:
 			mode.mode |= RADEON_AGP_4X_MODE;
 			break;
 		case 2:
 			mode.mode |= RADEON_AGP_2X_MODE;
 			break;
 		case 1:
 		default:
 			mode.mode |= RADEON_AGP_1X_MODE;
 			break;
 		}
 	}

 	mode.mode &= ~RADEON_AGP_FW_MODE; /* disable fw */
 	ret = drm_agp_enable(rdev->ddev, mode);
 	if (ret) {
 		DRM_ERROR("Unable to enable AGP (mode = 0x%lx)\n", mode.mode);
 		return ret;
 	}

 	rdev->mc.agp_base = rdev->ddev->agp->agp_info.aper_base;
 	rdev->mc.gtt_size = rdev->ddev->agp->agp_info.aper_size << 20;

 	/* workaround some hw issues */
 	if (rdev->family < CHIP_R200) {
 		WREG32(RADEON_AGP_CNTL, RREG32(RADEON_AGP_CNTL) | 0x000e0000);
 	}
 	return 0;
 #else
 	return 0;
 #endif
 }

 void radeon_agp_resume(struct radeon_device *rdev)
 {
 #if __OS_HAS_AGP
 	int r;
 	if (rdev->flags & RADEON_IS_AGP) {
 		r = radeon_agp_init(rdev);
 		if (r)
 			dev_warn(rdev->dev, "radeon AGP reinit failed\n");
 	}
 #endif
 }

 void radeon_agp_fini(struct radeon_device *rdev)
 {
 #if __OS_HAS_AGP
 	if (rdev->ddev->agp && rdev->ddev->agp->acquired) {
 		drm_agp_release(rdev->ddev);
 	}
 #endif
 }
	/*
	* Copyright 2008 Red Hat Inc.
	* Copyright 2009 Jerome Glisse.
	*
	* Permission is hereby granted, free of charge, to any person obtaining a
	* copy of this software and associated documentation files (the "Software"),
	* to deal in the Software without restriction, including without limitation
	* the rights to use, copy, modify, merge, publish, distribute, sublicense,
	* and/or sell copies of the Software, and to permit persons to whom the
	* Software is furnished to do so, subject to the following conditions:
	*
	* The above copyright notice and this permission notice shall be included in
	* all copies or substantial portions of the Software.
	*
	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
	* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
	* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
	* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
	* OTHER DEALINGS IN THE SOFTWARE.
	*
	* Authors:
	* Dave Airlie
	* Jerome Glisse <glisse@freedesktop.org>
	*/
	#include "drmP.h"
	#include "drm.h"
	#include "radeon.h"
	#include "radeon_drm.h"

	#if __OS_HAS_AGP

	struct radeon_agpmode_quirk {
	u32 hostbridge_vendor;
	u32 hostbridge_device;
	u32 chip_vendor;
	u32 chip_device;
	u32 subsys_vendor;
	u32 subsys_device;
	u32 default_mode;
	};

	static struct radeon_agpmode_quirk radeon_agpmode_quirk_list[] = {
	/* Intel E7505 Memory Controller Hub / RV350 AR [Radeon 9600XT] Needs AGPMode 4 (deb #515326) */
	{ PCI_VENDOR_ID_INTEL, 0x2550, PCI_VENDOR_ID_ATI, 0x4152, 0x1458, 0x4038, 4},
	/* Intel 82865G/PE/P DRAM Controller/Host-Hub / Mobility 9800 Needs AGPMode 4 (deb #462590) */
	{ PCI_VENDOR_ID_INTEL, 0x2570, PCI_VENDOR_ID_ATI, 0x4a4e, PCI_VENDOR_ID_DELL, 0x5106, 4},
	/* Intel 82865G/PE/P DRAM Controller/Host-Hub / RV280 [Radeon 9200 SE] Needs AGPMode 4 (lp #300304) */
	{ PCI_VENDOR_ID_INTEL, 0x2570, PCI_VENDOR_ID_ATI, 0x5964,
	0x148c, 0x2073, 4},
	/* Intel 82855PM Processor to I/O Controller / Mobility M6 LY Needs AGPMode 1 (deb #467235) */
	{ PCI_VENDOR_ID_INTEL, 0x3340, PCI_VENDOR_ID_ATI, 0x4c59,
	PCI_VENDOR_ID_IBM, 0x052f, 1},
	/* Intel 82855PM host bridge / Mobility 9600 M10 RV350 Needs AGPMode 1 (lp #195051) */
	{ PCI_VENDOR_ID_INTEL, 0x3340, PCI_VENDOR_ID_ATI, 0x4e50,
	PCI_VENDOR_ID_IBM, 0x0550, 1},
	/* Intel 82855PM host bridge / Mobility M7 needs AGPMode 1 */
	{ PCI_VENDOR_ID_INTEL, 0x3340, PCI_VENDOR_ID_ATI, 0x4c57,
	PCI_VENDOR_ID_IBM, 0x0530, 1},
	/* Intel 82855PM host bridge / FireGL Mobility T2 RV350 Needs AGPMode 2 (fdo #20647) */
	{ PCI_VENDOR_ID_INTEL, 0x3340, PCI_VENDOR_ID_ATI, 0x4e54,
	PCI_VENDOR_ID_IBM, 0x054f, 2},
	/* Intel 82855PM host bridge / Mobility M9+ / VaioPCG-V505DX Needs AGPMode 2 (fdo #17928) */
	{ PCI_VENDOR_ID_INTEL, 0x3340, PCI_VENDOR_ID_ATI, 0x5c61,
	PCI_VENDOR_ID_SONY, 0x816b, 2},
	/* Intel 82855PM Processor to I/O Controller / Mobility M9+ Needs AGPMode 8 (phoronix forum) */
	{ PCI_VENDOR_ID_INTEL, 0x3340, PCI_VENDOR_ID_ATI, 0x5c61,
	PCI_VENDOR_ID_SONY, 0x8195, 8},
	/* Intel 82830 830 Chipset Host Bridge / Mobility M6 LY Needs AGPMode 2 (fdo #17360)*/
	{ PCI_VENDOR_ID_INTEL, 0x3575, PCI_VENDOR_ID_ATI, 0x4c59,
	PCI_VENDOR_ID_DELL, 0x00e3, 2},
	/* Intel 82852/82855 host bridge / Mobility FireGL 9000 R250 Needs AGPMode 1 (lp #296617) */
	{ PCI_VENDOR_ID_INTEL, 0x3580, PCI_VENDOR_ID_ATI, 0x4c66,
	PCI_VENDOR_ID_DELL, 0x0149, 1},
	/* Intel 82852/82855 host bridge / Mobility 9600 M10 RV350 Needs AGPMode 1 (deb #467460) */
	{ PCI_VENDOR_ID_INTEL, 0x3580, PCI_VENDOR_ID_ATI, 0x4e50,
	0x1025, 0x0061, 1},
	/* Intel 82852/82855 host bridge / Mobility 9600 M10 RV350 Needs AGPMode 1 (lp #203007) */
	{ PCI_VENDOR_ID_INTEL, 0x3580, PCI_VENDOR_ID_ATI, 0x4e50,
	0x1025, 0x0064, 1},
	/* Intel 82852/82855 host bridge / Mobility 9600 M10 RV350 Needs AGPMode 1 (lp #141551) */
	{ PCI_VENDOR_ID_INTEL, 0x3580, PCI_VENDOR_ID_ATI, 0x4e50,
	PCI_VENDOR_ID_ASUSTEK, 0x1942, 1},
	/* Intel 82852/82855 host bridge / Mobility 9600/9700 Needs AGPMode 1 (deb #510208) */
	{ PCI_VENDOR_ID_INTEL, 0x3580, PCI_VENDOR_ID_ATI, 0x4e50,
	0x10cf, 0x127f, 1},
	/* ASRock K7VT4A+ AGP 8x / ATI Radeon 9250 AGP Needs AGPMode 4 (lp #133192) */
	{ 0x1849, 0x3189, PCI_VENDOR_ID_ATI, 0x5960,
	0x1787, 0x5960, 4},
	/* VIA K8M800 Host Bridge / RV280 [Radeon 9200 PRO] Needs AGPMode 4 (fdo #12544) */
	{ PCI_VENDOR_ID_VIA, 0x0204, PCI_VENDOR_ID_ATI, 0x5960,
	0x17af, 0x2020, 4},
	/* VIA KT880 Host Bridge / RV350 [Radeon 9550] Needs AGPMode 4 (fdo #19981) */
	{ PCI_VENDOR_ID_VIA, 0x0269, PCI_VENDOR_ID_ATI, 0x4153,
	PCI_VENDOR_ID_ASUSTEK, 0x003c, 4},
	/* VIA VT8363 Host Bridge / R200 QL [Radeon 8500] Needs AGPMode 2 (lp #141551) */
	{ PCI_VENDOR_ID_VIA, 0x0305, PCI_VENDOR_ID_ATI, 0x514c,
	PCI_VENDOR_ID_ATI, 0x013a, 2},
	/* VIA VT82C693A Host Bridge / RV280 [Radeon 9200 PRO] Needs AGPMode 2 (deb #515512) */
	{ PCI_VENDOR_ID_VIA, 0x0691, PCI_VENDOR_ID_ATI, 0x5960,
	PCI_VENDOR_ID_ASUSTEK, 0x004c, 2},
	/* VIA VT82C693A Host Bridge / RV280 [Radeon 9200 PRO] Needs AGPMode 2 */
	{ PCI_VENDOR_ID_VIA, 0x0691, PCI_VENDOR_ID_ATI, 0x5960,
	PCI_VENDOR_ID_ASUSTEK, 0x0054, 2},
	/* VIA VT8377 Host Bridge / R200 QM [Radeon 9100] Needs AGPMode 4 (deb #461144) */
	{ PCI_VENDOR_ID_VIA, 0x3189, PCI_VENDOR_ID_ATI, 0x514d,
	0x174b, 0x7149, 4},
	/* VIA VT8377 Host Bridge / RV280 [Radeon 9200 PRO] Needs AGPMode 4 (lp #312693) */
	{ PCI_VENDOR_ID_VIA, 0x3189, PCI_VENDOR_ID_ATI, 0x5960,
	0x1462, 0x0380, 4},
	/* VIA VT8377 Host Bridge / RV280 Needs AGPMode 4 (ati ML) */
	{ PCI_VENDOR_ID_VIA, 0x3189, PCI_VENDOR_ID_ATI, 0x5964,
	0x148c, 0x2073, 4},
	/* ATI Host Bridge / RV280 [M9+] Needs AGPMode 1 (phoronix forum) */
	{ PCI_VENDOR_ID_ATI, 0xcbb2, PCI_VENDOR_ID_ATI, 0x5c61,
	PCI_VENDOR_ID_SONY, 0x8175, 1},
	/* HP Host Bridge / R300 [FireGL X1] Needs AGPMode 2 (fdo #7770) */
	{ PCI_VENDOR_ID_HP, 0x122e, PCI_VENDOR_ID_ATI, 0x4e47,
	PCI_VENDOR_ID_ATI, 0x0152, 2},
	{ 0, 0, 0, 0, 0, 0, 0 },
	};
	#endif

	int radeon_agp_init(struct radeon_device *rdev)
	{
	#if __OS_HAS_AGP
	struct radeon_agpmode_quirk *p = radeon_agpmode_quirk_list;
	struct drm_agp_mode mode;
	struct drm_agp_info info;
	uint32_t agp_status;
	int default_mode;
	bool is_v3;
	int ret;

	if (rdev->ddev->agp->agp_info.aper_size < 32) {
	dev_warn(rdev->dev, "AGP aperture to small (%dM) "
	"need at least 32M, disabling AGP\n",
	rdev->ddev->agp->agp_info.aper_size);
	return -EINVAL;
	}

	/* Acquire AGP. */
	if (!rdev->ddev->agp->acquired) {
	ret = drm_agp_acquire(rdev->ddev);
	if (ret) {
	DRM_ERROR("Unable to acquire AGP: %d\n", ret);
	return ret;
	}
	}

	ret = drm_agp_info(rdev->ddev, &info);
	if (ret) {
	DRM_ERROR("Unable to get AGP info: %d\n", ret);
	return ret;
	}
	mode.mode = info.mode;
	agp_status = (RREG32(RADEON_AGP_STATUS) \| RADEON_AGPv3_MODE) & mode.mode;
	is_v3 = !!(agp_status & RADEON_AGPv3_MODE);

	if (is_v3) {
	default_mode = (agp_status & RADEON_AGPv3_8X_MODE) ? 8 : 4;
	} else {
	if (agp_status & RADEON_AGP_4X_MODE) {
	default_mode = 4;
	} else if (agp_status & RADEON_AGP_2X_MODE) {
	default_mode = 2;
	} else {
	default_mode = 1;
	}
	}

	/* Apply AGPMode Quirks */
	while (p && p->chip_device != 0) {
	if (info.id_vendor == p->hostbridge_vendor &&
	info.id_device == p->hostbridge_device &&
	rdev->pdev->vendor == p->chip_vendor &&
	rdev->pdev->device == p->chip_device &&
	rdev->pdev->subsystem_vendor == p->subsys_vendor &&
	rdev->pdev->subsystem_device == p->subsys_device) {
	default_mode = p->default_mode;
	}
	++p;
	}

	if (radeon_agpmode > 0) {
	if ((radeon_agpmode < (is_v3 ? 4 : 1)) \|\|
	(radeon_agpmode > (is_v3 ? 8 : 4)) \|\|
	(radeon_agpmode & (radeon_agpmode - 1))) {
	DRM_ERROR("Illegal AGP Mode: %d (valid %s), leaving at %d\n",
	radeon_agpmode, is_v3 ? "4, 8" : "1, 2, 4",
	default_mode);
	radeon_agpmode = default_mode;
	} else {
	DRM_INFO("AGP mode requested: %d\n", radeon_agpmode);
	}
	} else {
	radeon_agpmode = default_mode;
	}

	mode.mode &= ~RADEON_AGP_MODE_MASK;
	if (is_v3) {
	switch (radeon_agpmode) {
	case 8:
	mode.mode \|= RADEON_AGPv3_8X_MODE;
	break;
	case 4:
	default:
	mode.mode \|= RADEON_AGPv3_4X_MODE;
	break;
	}
	} else {
	switch (radeon_agpmode) {
	case 4:
	mode.mode \|= RADEON_AGP_4X_MODE;
	break;
	case 2:
	mode.mode \|= RADEON_AGP_2X_MODE;
	break;
	case 1:
	default:
	mode.mode \|= RADEON_AGP_1X_MODE;
	break;
	}
	}

	mode.mode &= ~RADEON_AGP_FW_MODE; /* disable fw */
	ret = drm_agp_enable(rdev->ddev, mode);
	if (ret) {
	DRM_ERROR("Unable to enable AGP (mode = 0x%lx)\n", mode.mode);
	return ret;
	}

	rdev->mc.agp_base = rdev->ddev->agp->agp_info.aper_base;
	rdev->mc.gtt_size = rdev->ddev->agp->agp_info.aper_size << 20;

	/* workaround some hw issues */
	if (rdev->family < CHIP_R200) {
	WREG32(RADEON_AGP_CNTL, RREG32(RADEON_AGP_CNTL) \| 0x000e0000);
	}
	return 0;
	#else
	return 0;
	#endif
	}

	void radeon_agp_resume(struct radeon_device *rdev)
	{
	#if __OS_HAS_AGP
	int r;
	if (rdev->flags & RADEON_IS_AGP) {
	r = radeon_agp_init(rdev);
	if (r)
	dev_warn(rdev->dev, "radeon AGP reinit failed\n");
	}
	#endif
	}

	void radeon_agp_fini(struct radeon_device *rdev)
	{
	#if __OS_HAS_AGP
	if (rdev->ddev->agp && rdev->ddev->agp->acquired) {
	drm_agp_release(rdev->ddev);
	}
	#endif
	}