Attached is a patch (against 2.4.20) which adds a palette hack for Voodoo3/4/5
cards to the offb driver. It's tested and working here on a Voodoo3 and a
Voodoo4. I'd welcome comments, though. Particularly, I think the probing for
a Voodoo card may be a bit shaky. Basically I'm match the OF name with the
pattern "3Dfx,Voodoo*". This may cause problems if there are Voodoo1 or 2
cards available with OF drivers, and so need tightening up.
--- /usr/src/linus-2.6/drivers/video/offb.c 2004-01-05 14:54:57.000000000 -0800
+++ offb.c 2004-01-06 13:21:32.000000000 -0800
@@ -43,6 +43,7 @@
cmap_M3B, /* ATI Rage Mobility M3 Head B */
cmap_radeon, /* ATI Radeon */
cmap_gxt2000, /* IBM GXT2000 */
+ cmap_3dfx, /* 3Dfx Voodoo3/4/5 */
};
struct offb_par {@@ -149,6 +150,18 @@
out_le32((unsigned *) par->cmap_adr + regno,
(red << 16 | green << 8 | blue));
break;
+ case cmap_3dfx:
+ /* Wait for 3 slots in the FIFO */
+ while((in_le32((unsigned *) par->cmap_adr) & 0x1F) < 3);
+ /* Is the desktop using the upper 256 entries of
+ * the CLUT ? */
+ if ((in_le32((unsigned *) par->cmap_adr + 0x5C) & 1 << 12))
+ regno += 256;
+ /* Stuff the palette index and data */
+ out_le32((unsigned *)(par->cmap_adr + 0x50), regno);
+ out_le32((unsigned *)(par->cmap_adr + 0x54),
+ (red << 16 | green << 8 | blue));
+ break;
}
if (regno < 16)
@@ -175,7 +188,7 @@
static int offb_blank(int blank, struct fb_info *info)
{
struct offb_par *par = (struct offb_par *) info->par;
- int i, j;
+ int i, j, regno;
if (!par->cmap_adr)
return 0;@@ -233,6 +246,20 @@
out_le32((unsigned *) par->cmap_adr + i,
0);
break;
+ case cmap_3dfx:
+ /* Wait for 3 slots in the FIFO */
+ while((in_le32((unsigned *) par->cmap_adr) & 0x1F) < 3);
+ /* Is the desktop using the upper 256
+ * entries of the CLUT ? */
+ regno = (in_le32((unsigned *) par->cmap_adr +
+ 0x5C) & 1 << 12) ?
+ i+256 : i;
+ /* Stuff the palette index and data */
+ out_le32((unsigned *)(par->cmap_adr + 0x50),
+ regno);
+ out_le32((unsigned *)(par->cmap_adr + 0x54),
+ 0);
+ break;
}
} else
fb_set_cmap(&info->cmap, 1, info);
@@ -466,6 +493,10 @@
unsigned long regbase = dp->addrs[0].address;
par->cmap_adr = ioremap(regbase + 0x6000, 0x1000);
par->cmap_type = cmap_gxt2000;
+ } else if (!strncmp(name, "3Dfx,Voodoo", 11)) {
+ unsigned long regbase = dp->addrs[2].address;
+ par->cmap_adr = ioremap(regbase, 0xff);
+ par->cmap_type = cmap_3dfx;
}
fix->visual = par->cmap_adr ? FB_VISUAL_PSEUDOCOLOR
: FB_VISUAL_STATIC_PSEUDOCOLOR;
-------------------------------------------------------