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>

1 files changed, 5 insertions, 1 deletions

diff --git a/drivers/video/cirrusfb.c b/drivers/video/cirrusfb.c
index 816433ffec9d..6ea505c6f0c8 100644
--- a/drivers/video/cirrusfb.c
+++ b/drivers/video/cirrusfb.c
@@ -314,7 +314,7 @@ static const struct zorrocl zcl_picasso4_z3 __devinitconst = {
         .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 @@ static int __devinit cirrusfb_zorro_register(struct zorro_dev *z,
         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)) {