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#include <linux/module.h>
#include "nouveau_drm.h"
#include "nouveau_agp.h"
#include "nouveau_reg.h"
#if __OS_HAS_AGP
MODULE_PARM_DESC(agpmode, "AGP mode (0 to disable AGP)");
static int nouveau_agpmode = -1;
module_param_named(agpmode, nouveau_agpmode, int, 0400);
struct nouveau_agpmode_quirk {
u16 hostbridge_vendor;
u16 hostbridge_device;
u16 chip_vendor;
u16 chip_device;
int mode;
};
static struct nouveau_agpmode_quirk nouveau_agpmode_quirk_list[] = {
/* VIA Apollo PRO133x / GeForce FX 5600 Ultra, max agpmode 2, fdo #20341 */
{ PCI_VENDOR_ID_VIA, 0x0691, PCI_VENDOR_ID_NVIDIA, 0x0311, 2 },
{},
};
static unsigned long
get_agp_mode(struct nouveau_drm *drm, const struct drm_agp_info *info)
{
struct nvif_device *device = &drm->device;
struct nouveau_agpmode_quirk *quirk = nouveau_agpmode_quirk_list;
int agpmode = nouveau_agpmode;
unsigned long mode = info->mode;
/*
* FW seems to be broken on nv18, it makes the card lock up
* randomly.
*/
if (device->info.chipset == 0x18)
mode &= ~PCI_AGP_COMMAND_FW;
/*
* Go through the quirks list and adjust the agpmode accordingly.
*/
while (agpmode == -1 && quirk->hostbridge_vendor) {
if (info->id_vendor == quirk->hostbridge_vendor &&
info->id_device == quirk->hostbridge_device &&
nvkm_device(device)->pdev->vendor == quirk->chip_vendor &&
nvkm_device(device)->pdev->device == quirk->chip_device) {
agpmode = quirk->mode;
NV_INFO(drm, "Forcing agp mode to %dX. Use agpmode to override.\n",
agpmode);
break;
}
++quirk;
}
/*
* AGP mode set in the command line.
*/
if (agpmode > 0) {
bool agpv3 = mode & 0x8;
int rate = agpv3 ? agpmode / 4 : agpmode;
mode = (mode & ~0x7) | (rate & 0x7);
}
return mode;
}
static bool
nouveau_agp_enabled(struct nouveau_drm *drm)
{
struct drm_device *dev = drm->dev;
if (!dev->pdev || !drm_pci_device_is_agp(dev) || !dev->agp)
return false;
if (drm->agp.stat == UNKNOWN) {
if (!nouveau_agpmode)
return false;
#ifdef __powerpc__
/* Disable AGP by default on all PowerPC machines for
* now -- At least some UniNorth-2 AGP bridges are
* known to be broken: DMA from the host to the card
* works just fine, but writeback from the card to the
* host goes straight to memory untranslated bypassing
* the GATT somehow, making them quite painful to deal
* with...
*/
if (nouveau_agpmode == -1)
return false;
#endif
return true;
}
return (drm->agp.stat == ENABLED);
}
#endif
void
nouveau_agp_reset(struct nouveau_drm *drm)
{
#if __OS_HAS_AGP
struct nvif_device *device = &drm->device;
struct drm_device *dev = drm->dev;
u32 save[2];
int ret;
if (!nouveau_agp_enabled(drm))
return;
/* First of all, disable fast writes, otherwise if it's
* already enabled in the AGP bridge and we disable the card's
* AGP controller we might be locking ourselves out of it. */
if ((nvif_rd32(device, NV04_PBUS_PCI_NV_19) |
dev->agp->mode) & PCI_AGP_COMMAND_FW) {
struct drm_agp_info info;
struct drm_agp_mode mode;
ret = drm_agp_info(dev, &info);
if (ret)
return;
mode.mode = get_agp_mode(drm, &info);
mode.mode &= ~PCI_AGP_COMMAND_FW;
ret = drm_agp_enable(dev, mode);
if (ret)
return;
}
/* clear busmaster bit, and disable AGP */
save[0] = nvif_mask(device, NV04_PBUS_PCI_NV_1, 0x00000004, 0x00000000);
nvif_wr32(device, NV04_PBUS_PCI_NV_19, 0);
/* reset PGRAPH, PFIFO and PTIMER */
save[1] = nvif_mask(device, 0x000200, 0x00011100, 0x00000000);
nvif_mask(device, 0x000200, 0x00011100, save[1]);
/* and restore bustmaster bit (gives effect of resetting AGP) */
nvif_wr32(device, NV04_PBUS_PCI_NV_1, save[0]);
#endif
}
void
nouveau_agp_init(struct nouveau_drm *drm)
{
#if __OS_HAS_AGP
struct drm_device *dev = drm->dev;
struct drm_agp_info info;
struct drm_agp_mode mode;
int ret;
if (!nouveau_agp_enabled(drm))
return;
drm->agp.stat = DISABLE;
ret = drm_agp_acquire(dev);
if (ret) {
NV_ERROR(drm, "unable to acquire AGP: %d\n", ret);
return;
}
ret = drm_agp_info(dev, &info);
if (ret) {
NV_ERROR(drm, "unable to get AGP info: %d\n", ret);
return;
}
/* see agp.h for the AGPSTAT_* modes available */
mode.mode = get_agp_mode(drm, &info);
ret = drm_agp_enable(dev, mode);
if (ret) {
NV_ERROR(drm, "unable to enable AGP: %d\n", ret);
return;
}
drm->agp.stat = ENABLED;
drm->agp.base = info.aperture_base;
drm->agp.size = info.aperture_size;
#endif
}
void
nouveau_agp_fini(struct nouveau_drm *drm)
{
#if __OS_HAS_AGP
struct drm_device *dev = drm->dev;
if (dev->agp && dev->agp->acquired)
drm_agp_release(dev);
#endif
}
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