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1/*2 * Copyright 2015 Nouveau Project3 *4 * Permission is hereby granted, free of charge, to any person obtaining a5 * copy of this software and associated documentation files (the "Software"),6 * to deal in the Software without restriction, including without limitation7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,8 * and/or sell copies of the Software, and to permit persons to whom the9 * Software is furnished to do so, subject to the following conditions:10 *11 * The above copyright notice and this permission notice shall be included in12 * all copies or substantial portions of the Software.13 *14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR20 * OTHER DEALINGS IN THE SOFTWARE.21 */22#include "agp.h"23#ifdef __NVKM_PCI_AGP_H__24#include <core/option.h>25 26struct nvkm_device_agp_quirk {27 u16 hostbridge_vendor;28 u16 hostbridge_device;29 u16 chip_vendor;30 u16 chip_device;31 int mode;32};33 34static const struct nvkm_device_agp_quirk35nvkm_device_agp_quirks[] = {36 /* VIA Apollo PRO133x / GeForce FX 5600 Ultra - fdo#20341 */37 { PCI_VENDOR_ID_VIA, 0x0691, PCI_VENDOR_ID_NVIDIA, 0x0311, 2 },38 /* SiS 761 does not support AGP cards, use PCI mode */39 { PCI_VENDOR_ID_SI, 0x0761, PCI_ANY_ID, PCI_ANY_ID, 0 },40 {},41};42 43void44nvkm_agp_fini(struct nvkm_pci *pci)45{46 if (pci->agp.acquired) {47 agp_backend_release(pci->agp.bridge);48 pci->agp.acquired = false;49 }50}51 52/* Ensure AGP controller is in a consistent state in case we need to53 * execute the VBIOS DEVINIT scripts.54 */55void56nvkm_agp_preinit(struct nvkm_pci *pci)57{58 struct nvkm_device *device = pci->subdev.device;59 u32 mode = nvkm_pci_rd32(pci, 0x004c);60 u32 save[2];61 62 /* First of all, disable fast writes, otherwise if it's already63 * enabled in the AGP bridge and we disable the card's AGP64 * controller we might be locking ourselves out of it.65 */66 if ((mode | pci->agp.mode) & PCI_AGP_COMMAND_FW) {67 mode = pci->agp.mode & ~PCI_AGP_COMMAND_FW;68 agp_enable(pci->agp.bridge, mode);69 }70 71 /* clear busmaster bit, and disable AGP */72 save[0] = nvkm_pci_rd32(pci, 0x0004);73 nvkm_pci_wr32(pci, 0x0004, save[0] & ~0x00000004);74 nvkm_pci_wr32(pci, 0x004c, 0x00000000);75 76 /* reset PGRAPH, PFIFO and PTIMER */77 save[1] = nvkm_mask(device, 0x000200, 0x00011100, 0x00000000);78 nvkm_mask(device, 0x000200, 0x00011100, save[1]);79 80 /* and restore busmaster bit (gives effect of resetting AGP) */81 nvkm_pci_wr32(pci, 0x0004, save[0]);82}83 84int85nvkm_agp_init(struct nvkm_pci *pci)86{87 if (!agp_backend_acquire(pci->pdev)) {88 nvkm_error(&pci->subdev, "failed to acquire agp\n");89 return -ENODEV;90 }91 92 agp_enable(pci->agp.bridge, pci->agp.mode);93 pci->agp.acquired = true;94 return 0;95}96 97void98nvkm_agp_dtor(struct nvkm_pci *pci)99{100 arch_phys_wc_del(pci->agp.mtrr);101}102 103void104nvkm_agp_ctor(struct nvkm_pci *pci)105{106 const struct nvkm_device_agp_quirk *quirk = nvkm_device_agp_quirks;107 struct nvkm_subdev *subdev = &pci->subdev;108 struct nvkm_device *device = subdev->device;109 struct agp_kern_info info;110 int mode = -1;111 112#ifdef __powerpc__113 /* Disable AGP by default on all PowerPC machines for now -- At114 * least some UniNorth-2 AGP bridges are known to be broken:115 * DMA from the host to the card works just fine, but writeback116 * from the card to the host goes straight to memory117 * untranslated bypassing that GATT somehow, making them quite118 * painful to deal with...119 */120 mode = 0;121#endif122 mode = nvkm_longopt(device->cfgopt, "NvAGP", mode);123 124 /* acquire bridge temporarily, so that we can copy its info */125 if (!(pci->agp.bridge = agp_backend_acquire(pci->pdev))) {126 nvkm_warn(subdev, "failed to acquire agp\n");127 return;128 }129 agp_copy_info(pci->agp.bridge, &info);130 agp_backend_release(pci->agp.bridge);131 132 pci->agp.mode = info.mode;133 pci->agp.base = info.aper_base;134 pci->agp.size = info.aper_size * 1024 * 1024;135 pci->agp.cma = info.cant_use_aperture;136 pci->agp.mtrr = -1;137 138 /* determine if bridge + chipset combination needs a workaround */139 while (quirk->hostbridge_vendor) {140 if (info.device->vendor == quirk->hostbridge_vendor &&141 info.device->device == quirk->hostbridge_device &&142 (quirk->chip_vendor == (u16)PCI_ANY_ID ||143 pci->pdev->vendor == quirk->chip_vendor) &&144 (quirk->chip_device == (u16)PCI_ANY_ID ||145 pci->pdev->device == quirk->chip_device)) {146 nvkm_info(subdev, "forcing default agp mode to %dX, "147 "use NvAGP=<mode> to override\n",148 quirk->mode);149 mode = quirk->mode;150 break;151 }152 quirk++;153 }154 155 /* apply quirk / user-specified mode */156 if (mode >= 1) {157 if (pci->agp.mode & 0x00000008)158 mode /= 4; /* AGPv3 */159 pci->agp.mode &= ~0x00000007;160 pci->agp.mode |= (mode & 0x7);161 } else162 if (mode == 0) {163 pci->agp.bridge = NULL;164 return;165 }166 167 /* fast writes appear to be broken on nv18, they make the card168 * lock up randomly.169 */170 if (device->chipset == 0x18)171 pci->agp.mode &= ~PCI_AGP_COMMAND_FW;172 173 pci->agp.mtrr = arch_phys_wc_add(pci->agp.base, pci->agp.size);174}175#endif176