fbdev/cirrusfb: Add support for Picasso IV in Zorro II mode

In Zorro II mode, the Village Tronic Picasso IV graphics card shows up as
either 2 or 3 Zorro devices:
  - One for the registers of the Cirrus Logic graphics chip,
  - One for the first bank of 2 MiB of graphics memory,
  - An optional one for the second bank of 2 MiB of graphics memory,
    if there was enough free Zorro II address space.

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, 21 insertions, 0 deletions

diff --git a/drivers/video/cirrusfb.c b/drivers/video/cirrusfb.c
index 357139ab7a0f..816433ffec9d 100644
--- a/drivers/video/cirrusfb.c
+++ b/drivers/video/cirrusfb.c
@@ -287,6 +287,7 @@ struct zorrocl {
                                 /* If zero, use autoprobe on RAM device */
         u32 ramoffset;          /* Offset of video RAM in first Zorro device */
         zorro_id ramid;         /* Zorro ID of RAM device */
+        zorro_id ramid2;        /* Zorro ID of optional second RAM device */
 };
 
 static const struct zorrocl zcl_sd64 __devinitconst = {
@@ -316,6 +317,13 @@ static const struct zorrocl zcl_picasso4_z3 __devinitconst = {
         .ramoffset      = 0x01000000,
 };
 
+static const struct zorrocl zcl_picasso4_z2 __devinitconst = {
+        .type           = BT_PICASSO4,
+        .regoffset      = 0x10000,
+        .ramid          = ZORRO_PROD_VILLAGE_TRONIC_PICASSO_IV_Z2_RAM1,
+        .ramid2         = ZORRO_PROD_VILLAGE_TRONIC_PICASSO_IV_Z2_RAM2,
+};
+
 
 static const struct zorro_device_id cirrusfb_zorro_table[] __devinitconst = {
         {
@@ -333,6 +341,9 @@ static const struct zorro_device_id cirrusfb_zorro_table[] __devinitconst = {
         }, {
                 .id             = ZORRO_PROD_VILLAGE_TRONIC_PICASSO_IV_Z3,
                 .driver_data    = (unsigned long)&zcl_picasso4_z3,
+        }, {
+                .id             = ZORRO_PROD_VILLAGE_TRONIC_PICASSO_IV_Z2_REG,
+                .driver_data    = (unsigned long)&zcl_picasso4_z2,
         },
         { 0 }
 };
@@ -2257,6 +2268,16 @@ static int __devinit cirrusfb_zorro_register(struct zorro_dev *z,
                 }
                 rambase = zorro_resource_start(ram);
                 ramsize = zorro_resource_len(ram);
+                if (zcl->ramid2 &&
+                    (ram = zorro_find_device(zcl->ramid2, NULL))) {
+                        if (zorro_resource_start(ram) != rambase + ramsize) {
+                                dev_warn(info->device,
+                                         "Skipping non-contiguous RAM at %pR\n",
+                                         &ram->resource);
+                        } else {
+                                ramsize += zorro_resource_len(ram);
+                        }
+                }
         }
 
         dev_info(info->device,