drivers/gpu/drm/nouveau/nouveau_agp.c

   1 #include <linux/module.h>
   2
   3 #include "nouveau_drm.h"
   4 #include "nouveau_agp.h"
   5 #include "nouveau_reg.h"
   6
   7 #if __OS_HAS_AGP
   8 MODULE_PARM_DESC(agpmode, "AGP mode (0 to disable AGP)");
   9 static int nouveau_agpmode = -1;
  10 module_param_named(agpmode, nouveau_agpmode, int, 0400);
  11
  12 struct nouveau_agpmode_quirk {
  13         u16 hostbridge_vendor;
  14         u16 hostbridge_device;
  15         u16 chip_vendor;
  16         u16 chip_device;
  17         int mode;
  18 };
  19
  20 static struct nouveau_agpmode_quirk nouveau_agpmode_quirk_list[] = {
  21         /* VIA Apollo PRO133x / GeForce FX 5600 Ultra, max agpmode 2, fdo #20341 */
  22         { PCI_VENDOR_ID_VIA, 0x0691, PCI_VENDOR_ID_NVIDIA, 0x0311, 2 },
  23
  24         {},
  25 };
  26
  27 static unsigned long
  28 get_agp_mode(struct nouveau_drm *drm, const struct drm_agp_info *info)
  29 {
  30         struct nvif_device *device = &drm->device;
  31         struct nouveau_agpmode_quirk *quirk = nouveau_agpmode_quirk_list;
  32         int agpmode = nouveau_agpmode;
  33         unsigned long mode = info->mode;
  34
  35         /*
  36          * FW seems to be broken on nv18, it makes the card lock up
  37          * randomly.
  38          */
  39         if (device->info.chipset == 0x18)
  40                 mode &= ~PCI_AGP_COMMAND_FW;
  41
  42         /*
  43          * Go through the quirks list and adjust the agpmode accordingly.
  44          */
  45         while (agpmode == -1 && quirk->hostbridge_vendor) {
  46                 if (info->id_vendor == quirk->hostbridge_vendor &&
  47                     info->id_device == quirk->hostbridge_device &&
  48                     nvxx_device(device)->pdev->vendor == quirk->chip_vendor &&
  49                     nvxx_device(device)->pdev->device == quirk->chip_device) {
  50                         agpmode = quirk->mode;
  51                         NV_INFO(drm, "Forcing agp mode to %dX. Use agpmode to override.\n",
  52                                 agpmode);
  53                         break;
  54                 }
  55                 ++quirk;
  56         }
  57
  58         /*
  59          * AGP mode set in the command line.
  60          */
  61         if (agpmode > 0) {
  62                 bool agpv3 = mode & 0x8;
  63                 int rate = agpv3 ? agpmode / 4 : agpmode;
  64
  65                 mode = (mode & ~0x7) | (rate & 0x7);
  66         }
  67
  68         return mode;
  69 }
  70
  71 static bool
  72 nouveau_agp_enabled(struct nouveau_drm *drm)
  73 {
  74         struct drm_device *dev = drm->dev;
  75
  76         if (!dev->pdev || !drm_pci_device_is_agp(dev) || !dev->agp)
  77                 return false;
  78
  79         if (drm->agp.stat == UNKNOWN) {
  80                 if (!nouveau_agpmode)
  81                         return false;
  82 #ifdef __powerpc__
  83                 /* Disable AGP by default on all PowerPC machines for
  84                  * now -- At least some UniNorth-2 AGP bridges are
  85                  * known to be broken: DMA from the host to the card
  86                  * works just fine, but writeback from the card to the
  87                  * host goes straight to memory untranslated bypassing
  88                  * the GATT somehow, making them quite painful to deal
  89                  * with...
  90                  */
  91                 if (nouveau_agpmode == -1)
  92                         return false;
  93 #endif
  94                 return true;
  95         }
  96
  97         return (drm->agp.stat == ENABLED);
  98 }
  99 #endif
 100
 101 void
 102 nouveau_agp_reset(struct nouveau_drm *drm)
 103 {
 104 #if __OS_HAS_AGP
 105         struct nvif_device *device = &drm->device;
 106         struct drm_device *dev = drm->dev;
 107         u32 save[2];
 108         int ret;
 109
 110         if (!nouveau_agp_enabled(drm))
 111                 return;
 112
 113         /* First of all, disable fast writes, otherwise if it's
 114          * already enabled in the AGP bridge and we disable the card's
 115          * AGP controller we might be locking ourselves out of it. */
 116         if ((nvif_rd32(device, NV04_PBUS_PCI_NV_19) |
 117              dev->agp->mode) & PCI_AGP_COMMAND_FW) {
 118                 struct drm_agp_info info;
 119                 struct drm_agp_mode mode;
 120
 121                 ret = drm_agp_info(dev, &info);
 122                 if (ret)
 123                         return;
 124
 125                 mode.mode  = get_agp_mode(drm, &info);
 126                 mode.mode &= ~PCI_AGP_COMMAND_FW;
 127
 128                 ret = drm_agp_enable(dev, mode);
 129                 if (ret)
 130                         return;
 131         }
 132
 133
 134         /* clear busmaster bit, and disable AGP */
 135         save[0] = nvif_mask(device, NV04_PBUS_PCI_NV_1, 0x00000004, 0x00000000);
 136         nvif_wr32(device, NV04_PBUS_PCI_NV_19, 0);
 137
 138         /* reset PGRAPH, PFIFO and PTIMER */
 139         save[1] = nvif_mask(device, 0x000200, 0x00011100, 0x00000000);
 140         nvif_mask(device, 0x000200, 0x00011100, save[1]);
 141
 142         /* and restore bustmaster bit (gives effect of resetting AGP) */
 143         nvif_wr32(device, NV04_PBUS_PCI_NV_1, save[0]);
 144 #endif
 145 }
 146
 147 void
 148 nouveau_agp_init(struct nouveau_drm *drm)
 149 {
 150 #if __OS_HAS_AGP
 151         struct drm_device *dev = drm->dev;
 152         struct drm_agp_info info;
 153         struct drm_agp_mode mode;
 154         int ret;
 155
 156         if (!nouveau_agp_enabled(drm))
 157                 return;
 158         drm->agp.stat = DISABLE;
 159
 160         ret = drm_agp_acquire(dev);
 161         if (ret) {
 162                 NV_ERROR(drm, "unable to acquire AGP: %d\n", ret);
 163                 return;
 164         }
 165
 166         ret = drm_agp_info(dev, &info);
 167         if (ret) {
 168                 NV_ERROR(drm, "unable to get AGP info: %d\n", ret);
 169                 return;
 170         }
 171
 172         /* see agp.h for the AGPSTAT_* modes available */
 173         mode.mode = get_agp_mode(drm, &info);
 174
 175         ret = drm_agp_enable(dev, mode);
 176         if (ret) {
 177                 NV_ERROR(drm, "unable to enable AGP: %d\n", ret);
 178                 return;
 179         }
 180
 181         drm->agp.stat = ENABLED;
 182         drm->agp.base = info.aperture_base;
 183         drm->agp.size = info.aperture_size;
 184 #endif
 185 }
 186
 187 void
 188 nouveau_agp_fini(struct nouveau_drm *drm)
 189 {
 190 #if __OS_HAS_AGP
 191         struct drm_device *dev = drm->dev;
 192         if (dev->agp && dev->agp->acquired)
 193                 drm_agp_release(dev);
 194 #endif
 195 }