[POWERPC] Fix various offb issues

This patch fixes a few issues in offb:

 - A test was inverted causing the palette hack to never work
(no device node was passed down to the init function)

 - Some cards seem to have their assigned-addresses property in a random
order, thus we need to try using of_get_pci_address() first, which will
fail if it's not a PCI device, and fallback to of_get_address() in that
case. of_get_pci_address() properly parsees assigned-addresses to test
the BAR number and thus will get it right whatever the order is.

 - Some cards (like GXT4500) provide a linebytes of 0xffffffff in the
device-tree which does no good. This patch handles that by using the
screen width when that happens. (Also fixes btext.c while at it).

 - Add detection of the GXT4500 in addition to the GXT2000 for the
palette hacks (we use the same hack, palette is linear in register space
at offset 0x6000).

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>

2 files changed, 24 insertions, 14 deletions

diff --git a/arch/powerpc/kernel/btext.c b/arch/powerpc/kernel/btext.c
index 995fcef156fd..93f21aaf7c8e 100644
--- a/arch/powerpc/kernel/btext.c
+++ b/arch/powerpc/kernel/btext.c
@@ -182,7 +182,7 @@ int btext_initialize(struct device_node *np)
         prop = get_property(np, "linux,bootx-linebytes", NULL);
         if (prop == NULL)
                 prop = get_property(np, "linebytes", NULL);
-        if (prop)
+        if (prop && *prop != 0xffffffffu)
                 pitch = *prop;
         if (pitch == 1)
                 pitch = 0x1000;
diff --git a/drivers/video/offb.c b/drivers/video/offb.c
index bad0e98fb3b6..9a40bbecf76b 100644
--- a/drivers/video/offb.c
+++ b/drivers/video/offb.c
@@ -157,7 +157,7 @@ static int offb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
                 out_le32(par->cmap_adr + 0xb4, (red << 16 | green << 8 | blue));
                 break;
         case cmap_gxt2000:
-                out_le32((unsigned __iomem *) par->cmap_adr + regno,
+                out_le32(((unsigned __iomem *) par->cmap_adr) + regno,
                          (red << 16 | green << 8 | blue));
                 break;
         }
@@ -213,7 +213,7 @@ static int offb_blank(int blank, struct fb_info *info)
                                 out_le32(par->cmap_adr + 0xb4, 0);
                                 break;
                         case cmap_gxt2000:
-                                out_le32((unsigned __iomem *) par->cmap_adr + i,
+                                out_le32(((unsigned __iomem *) par->cmap_adr) + i,
                                          0);
                                 break;
                         }
@@ -226,13 +226,23 @@ static int offb_blank(int blank, struct fb_info *info)
 static void __iomem *offb_map_reg(struct device_node *np, int index,
                                   unsigned long offset, unsigned long size)
 {
-        struct resource r;
-
-        if (of_address_to_resource(np, index, &r))
-                return 0;
-        if ((r.start + offset + size) > r.end)
-                return 0;
-        return ioremap(r.start + offset, size);
+        const u32 *addrp;
+        u64 asize, taddr;
+        unsigned int flags;
+
+        addrp = of_get_pci_address(np, index, &asize, &flags);
+        if (addrp == NULL)
+                addrp = of_get_address(np, index, &asize, &flags);
+        if (addrp == NULL)
+                return NULL;
+        if ((flags & (IORESOURCE_IO | IORESOURCE_MEM)) == 0)
+                return NULL;
+        if ((offset + size) > asize)
+                return NULL;
+        taddr = of_translate_address(np, addrp);
+        if (taddr == OF_BAD_ADDR)
+                return NULL;
+        return ioremap(taddr + offset, size);
 }
 
 static void __init offb_init_fb(const char *name, const char *full_name,
@@ -289,7 +299,6 @@ static void __init offb_init_fb(const char *name, const char *full_name,
 
         par->cmap_type = cmap_unknown;
         if (depth == 8) {
-                /* Palette hacks disabled for now */
                 if (dp && !strncmp(name, "ATY,Rage128", 11)) {
                         par->cmap_adr = offb_map_reg(dp, 2, 0, 0x1fff);
                         if (par->cmap_adr)
@@ -313,7 +322,8 @@ static void __init offb_init_fb(const char *name, const char *full_name,
                             ioremap(base + 0x7ff000, 0x1000) + 0xcc0;
                         par->cmap_data = par->cmap_adr + 1;
                         par->cmap_type = cmap_m64;
-                } else if (dp && device_is_compatible(dp, "pci1014,b7")) {
+                } else if (dp && (device_is_compatible(dp, "pci1014,b7") ||
+                                  device_is_compatible(dp, "pci1014,21c"))) {
                         par->cmap_adr = offb_map_reg(dp, 0, 0x6000, 0x1000);
                         if (par->cmap_adr)
                                 par->cmap_type = cmap_gxt2000;
@@ -433,7 +443,7 @@ static void __init offb_init_nodriver(struct device_node *dp, int no_real_node)
         pp = get_property(dp, "linux,bootx-linebytes", &len);
         if (pp == NULL)
                 pp = get_property(dp, "linebytes", &len);
-        if (pp && len == sizeof(u32))
+        if (pp && len == sizeof(u32) && (*pp != 0xffffffffu))
                 pitch = *pp;
         else
                 pitch = width * ((depth + 7) / 8);
@@ -496,7 +506,7 @@ static void __init offb_init_nodriver(struct device_node *dp, int no_real_node)
                 offb_init_fb(no_real_node ? "bootx" : dp->name,
                              no_real_node ? "display" : dp->full_name,
                              width, height, depth, pitch, address,
-                             no_real_node ? dp : NULL);
+                             no_real_node ? NULL : dp);
         }
 }