fbdev/cirrusfb: Add support for "64 MiB" version of Picasso IV
Some Village Tronic Picasso IV graphics cards identify as a 64 MiB Zorro
device in Zorro III mode.
While the total graphics memory size is the same on such cards, the offset
of the graphics memory differs. Add a quirk to handle this.
Based on src/sys/arch/amiga/dev/grf_cl.c from NetBSD.
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Acked-by: Jeff Garzik <jgarzik@redhat.com>
Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>
diff --git a/drivers/video/cirrusfb.c b/drivers/video/cirrusfb.c
index 816433f..6ea505c 100644
--- a/drivers/video/cirrusfb.c
+++ b/drivers/video/cirrusfb.c
@@ -314,7 +314,7 @@
.type = BT_PICASSO4,
.regoffset = 0x00600000,
.ramsize = 4 * MB_,
- .ramoffset = 0x01000000,
+ .ramoffset = 0x01000000, /* 0x02000000 for 64 MiB boards */
};
static const struct zorrocl zcl_picasso4_z2 __devinitconst = {
@@ -2259,6 +2259,10 @@
ramsize = zcl->ramsize;
if (ramsize) {
rambase = zorro_resource_start(z) + zcl->ramoffset;
+ if (zorro_resource_len(z) == 64 * MB_) {
+ /* Quirk for 64 MiB Picasso IV */
+ rambase += zcl->ramoffset;
+ }
} else {
struct zorro_dev *ram = zorro_find_device(zcl->ramid, NULL);
if (!ram || !zorro_resource_len(ram)) {