Some fixes for tdfxfb on big-endian systems

[dpates@dsdk12.net (Derrik Pates)]

I'm attaching a patch which does fix some of the problems with 3Dfx
video boards on big endian systems (like PowerPC). First, it introduces
setting bit 20 ("Host byte word swizzle", from the Voodoo3 register
docs) in the srcFormat register setting, for the do_putc() and
do_putcs() accelerated text operations, making accelerated text mode
work properly. Second, it enables PCI resource BAR #2 (the IO port
range) for the 3Dfx video board, making video mode switching work
correctly. I may just go ahead and remove the register writes for that
though, since according to the register docs, writing to the same offset
in the register memory range for the 3Dfx does the same thing, plus it
removes the issue of IO port accesses on a non-primary PCI bus (where
its port IO register window is not at 0).

-- 
Derrik Pates
dpates@dsdk12.net
dpates@voxel.net

--- /usr/src/linux/drivers/video/tdfxfb.c	2002-02-25 14:38:07.000000000 -0500
+++ tdfxfb.c	2002-12-14 09:52:08.000000000 -0500
@@ -762,7 +762,12 @@
    tdfx_outl(SRCXY,     0);
    tdfx_outl(DSTXY,     xx | (yy << 16));
    tdfx_outl(COMMAND_2D, COMMAND_2D_H2S_BITBLT | (ROP_COPY << 24));
+#if defined(__BIG_ENDIAN__)
+   /* Add the bit to automatically reorder bytes on BE systems.  -- dpates */
+   tdfx_outl(SRCFORMAT, 0x400000 | 0x100000);
+#elif defined(__LITTLE_ENDIAN__)
    tdfx_outl(SRCFORMAT, 0x400000);
+#endif
    tdfx_outl(DSTFORMAT, fmt);
    tdfx_outl(DSTSIZE,   fontwidth(p) | (fontheight(p) << 16));
    i=fontheight(p);
@@ -820,7 +825,12 @@
    tdfx_outl(COMMAND_3D, COMMAND_3D_NOP);
    tdfx_outl(COLORFORE, fgx);
    tdfx_outl(COLORBACK, bgx);
+#if defined(__BIG_ENDIAN__)
+   /* Add the bit to automatically reorder bytes for BE systems.  -- dpates */
+   tdfx_outl(SRCFORMAT, 0x400000 | 0x100000);
+#elif defined(__LITTLE_ENDIAN__)
    tdfx_outl(SRCFORMAT, 0x400000);
+#endif
    tdfx_outl(DSTFORMAT, fmt);
    tdfx_outl(DSTSIZE, w | (h << 16));
    tdfx_outl(SRCXY,     0);
@@ -1951,6 +1976,10 @@
 		return -ENXIO;
 	}
 
+	/* make sure PCI resource 2 (IO port range) is turned on. of course, if
+	 * this is on a secondary PCI bus (where the IO range isn't at the 
+	 * global 0-offset point), things _will_ break. */
+	pci_enable_device_bars (pdev, 1<<2);
 	fb_info.iobase = pci_resource_start (pdev, 2);
       
 	printk("fb: %s memory = %ldK\n", name, fb_info.bufbase_size >> 10);