| 1 | /* $NetBSD: nouveau_agp.c,v 1.3 2015/04/03 01:09:42 riastradh Exp $ */ |
| 2 | |
| 3 | #include <sys/cdefs.h> |
| 4 | __KERNEL_RCSID(0, "$NetBSD: nouveau_agp.c,v 1.3 2015/04/03 01:09:42 riastradh Exp $" ); |
| 5 | |
| 6 | #include <linux/module.h> |
| 7 | #include <linux/moduleparam.h> |
| 8 | |
| 9 | #include <core/device.h> |
| 10 | |
| 11 | #include "nouveau_drm.h" |
| 12 | #include "nouveau_agp.h" |
| 13 | #include "nouveau_reg.h" |
| 14 | |
| 15 | #if __OS_HAS_AGP |
| 16 | MODULE_PARM_DESC(agpmode, "AGP mode (0 to disable AGP)" ); |
| 17 | static int nouveau_agpmode = -1; |
| 18 | module_param_named(agpmode, nouveau_agpmode, int, 0400); |
| 19 | |
| 20 | struct nouveau_agpmode_quirk { |
| 21 | u16 hostbridge_vendor; |
| 22 | u16 hostbridge_device; |
| 23 | u16 chip_vendor; |
| 24 | u16 chip_device; |
| 25 | int mode; |
| 26 | }; |
| 27 | |
| 28 | static struct nouveau_agpmode_quirk nouveau_agpmode_quirk_list[] = { |
| 29 | /* VIA Apollo PRO133x / GeForce FX 5600 Ultra, max agpmode 2, fdo #20341 */ |
| 30 | { PCI_VENDOR_ID_VIA, 0x0691, PCI_VENDOR_ID_NVIDIA, 0x0311, 2 }, |
| 31 | |
| 32 | {}, |
| 33 | }; |
| 34 | |
| 35 | static unsigned long |
| 36 | get_agp_mode(struct nouveau_drm *drm, const struct drm_agp_info *info) |
| 37 | { |
| 38 | struct nouveau_device *device = nv_device(drm->device); |
| 39 | struct nouveau_agpmode_quirk *quirk = nouveau_agpmode_quirk_list; |
| 40 | int agpmode = nouveau_agpmode; |
| 41 | unsigned long mode = info->mode; |
| 42 | |
| 43 | /* |
| 44 | * FW seems to be broken on nv18, it makes the card lock up |
| 45 | * randomly. |
| 46 | */ |
| 47 | if (device->chipset == 0x18) |
| 48 | mode &= ~PCI_AGP_COMMAND_FW; |
| 49 | |
| 50 | /* |
| 51 | * Go through the quirks list and adjust the agpmode accordingly. |
| 52 | */ |
| 53 | while (agpmode == -1 && quirk->hostbridge_vendor) { |
| 54 | if (info->id_vendor == quirk->hostbridge_vendor && |
| 55 | info->id_device == quirk->hostbridge_device && |
| 56 | device->pdev->vendor == quirk->chip_vendor && |
| 57 | device->pdev->device == quirk->chip_device) { |
| 58 | agpmode = quirk->mode; |
| 59 | nv_info(device, "Forcing agp mode to %dX. Use agpmode to override.\n" , |
| 60 | agpmode); |
| 61 | break; |
| 62 | } |
| 63 | ++quirk; |
| 64 | } |
| 65 | |
| 66 | /* |
| 67 | * AGP mode set in the command line. |
| 68 | */ |
| 69 | if (agpmode > 0) { |
| 70 | bool agpv3 = mode & 0x8; |
| 71 | int rate = agpv3 ? agpmode / 4 : agpmode; |
| 72 | |
| 73 | mode = (mode & ~0x7) | (rate & 0x7); |
| 74 | } |
| 75 | |
| 76 | return mode; |
| 77 | } |
| 78 | |
| 79 | static bool |
| 80 | nouveau_agp_enabled(struct nouveau_drm *drm) |
| 81 | { |
| 82 | struct drm_device *dev = drm->dev; |
| 83 | |
| 84 | if (!dev->pdev || !drm_pci_device_is_agp(dev) || !dev->agp) |
| 85 | return false; |
| 86 | |
| 87 | if (drm->agp.stat == UNKNOWN) { |
| 88 | if (!nouveau_agpmode) |
| 89 | return false; |
| 90 | #ifdef __powerpc__ |
| 91 | /* Disable AGP by default on all PowerPC machines for |
| 92 | * now -- At least some UniNorth-2 AGP bridges are |
| 93 | * known to be broken: DMA from the host to the card |
| 94 | * works just fine, but writeback from the card to the |
| 95 | * host goes straight to memory untranslated bypassing |
| 96 | * the GATT somehow, making them quite painful to deal |
| 97 | * with... |
| 98 | */ |
| 99 | if (nouveau_agpmode == -1) |
| 100 | return false; |
| 101 | #endif |
| 102 | return true; |
| 103 | } |
| 104 | |
| 105 | return (drm->agp.stat == ENABLED); |
| 106 | } |
| 107 | #endif |
| 108 | |
| 109 | void |
| 110 | nouveau_agp_reset(struct nouveau_drm *drm) |
| 111 | { |
| 112 | #if __OS_HAS_AGP |
| 113 | struct nouveau_device *device = nv_device(drm->device); |
| 114 | struct drm_device *dev = drm->dev; |
| 115 | u32 save[2]; |
| 116 | int ret; |
| 117 | |
| 118 | if (!nouveau_agp_enabled(drm)) |
| 119 | return; |
| 120 | |
| 121 | /* First of all, disable fast writes, otherwise if it's |
| 122 | * already enabled in the AGP bridge and we disable the card's |
| 123 | * AGP controller we might be locking ourselves out of it. */ |
| 124 | if ((nv_rd32(device, NV04_PBUS_PCI_NV_19) | |
| 125 | dev->agp->mode) & PCI_AGP_COMMAND_FW) { |
| 126 | struct drm_agp_info info; |
| 127 | struct drm_agp_mode mode; |
| 128 | |
| 129 | ret = drm_agp_info(dev, &info); |
| 130 | if (ret) |
| 131 | return; |
| 132 | |
| 133 | mode.mode = get_agp_mode(drm, &info); |
| 134 | mode.mode &= ~PCI_AGP_COMMAND_FW; |
| 135 | |
| 136 | ret = drm_agp_enable(dev, mode); |
| 137 | if (ret) |
| 138 | return; |
| 139 | } |
| 140 | |
| 141 | |
| 142 | /* clear busmaster bit, and disable AGP */ |
| 143 | save[0] = nv_mask(device, NV04_PBUS_PCI_NV_1, 0x00000004, 0x00000000); |
| 144 | nv_wr32(device, NV04_PBUS_PCI_NV_19, 0); |
| 145 | |
| 146 | /* reset PGRAPH, PFIFO and PTIMER */ |
| 147 | save[1] = nv_mask(device, 0x000200, 0x00011100, 0x00000000); |
| 148 | nv_mask(device, 0x000200, 0x00011100, save[1]); |
| 149 | |
| 150 | /* and restore bustmaster bit (gives effect of resetting AGP) */ |
| 151 | nv_wr32(device, NV04_PBUS_PCI_NV_1, save[0]); |
| 152 | #endif |
| 153 | } |
| 154 | |
| 155 | void |
| 156 | nouveau_agp_init(struct nouveau_drm *drm) |
| 157 | { |
| 158 | #if __OS_HAS_AGP |
| 159 | struct nouveau_device *device = nv_device(drm->device); |
| 160 | struct drm_device *dev = drm->dev; |
| 161 | struct drm_agp_info info; |
| 162 | struct drm_agp_mode mode; |
| 163 | int ret; |
| 164 | |
| 165 | if (!nouveau_agp_enabled(drm)) |
| 166 | return; |
| 167 | drm->agp.stat = DISABLE; |
| 168 | |
| 169 | ret = drm_agp_acquire(dev); |
| 170 | if (ret) { |
| 171 | nv_error(device, "unable to acquire AGP: %d\n" , ret); |
| 172 | return; |
| 173 | } |
| 174 | |
| 175 | ret = drm_agp_info(dev, &info); |
| 176 | if (ret) { |
| 177 | nv_error(device, "unable to get AGP info: %d\n" , ret); |
| 178 | return; |
| 179 | } |
| 180 | |
| 181 | /* see agp.h for the AGPSTAT_* modes available */ |
| 182 | mode.mode = get_agp_mode(drm, &info); |
| 183 | |
| 184 | ret = drm_agp_enable(dev, mode); |
| 185 | if (ret) { |
| 186 | nv_error(device, "unable to enable AGP: %d\n" , ret); |
| 187 | return; |
| 188 | } |
| 189 | |
| 190 | drm->agp.stat = ENABLED; |
| 191 | drm->agp.base = info.aperture_base; |
| 192 | drm->agp.size = info.aperture_size; |
| 193 | #ifdef __NetBSD__ |
| 194 | pmap_pv_track(drm->agp.base, drm->agp.size); |
| 195 | #endif |
| 196 | #endif |
| 197 | } |
| 198 | |
| 199 | void |
| 200 | nouveau_agp_fini(struct nouveau_drm *drm) |
| 201 | { |
| 202 | #if __OS_HAS_AGP |
| 203 | struct drm_device *dev = drm->dev; |
| 204 | if (dev->agp && dev->agp->acquired) { |
| 205 | #ifdef __NetBSD__ |
| 206 | pmap_pv_untrack(drm->agp.base, drm->agp.size); |
| 207 | #endif |
| 208 | drm_agp_release(dev); |
| 209 | } |
| 210 | #endif |
| 211 | } |
| 212 | |