fbdev: Teaches offb about palette on radeon r5xx/r6xx

The offb driver already has a collection of hacks to be able to set
the palette on various chips. This adds support for r5xx/r6xx radeons.

This is needed as offb is the only console solution on these currently
and the firmware in some cases sets a really bad color palette. This
fixes using some Radeon X16xx on the Powerstation for example.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

1 files changed, 142 insertions, 50 deletions

diff --git a/drivers/video/offb.c b/drivers/video/offb.c
index d7b3dcc0dc43..e1d9eeb1aeaf 100644
--- a/drivers/video/offb.c
+++ b/drivers/video/offb.c
@@ -47,6 +47,7 @@ enum {
         cmap_M3B,               /* ATI Rage Mobility M3 Head B */
         cmap_radeon,            /* ATI Radeon */
         cmap_gxt2000,           /* IBM GXT2000 */
+        cmap_avivo,             /* ATI R5xx */
 };
 
 struct offb_par {
@@ -58,26 +59,36 @@ struct offb_par {
 
 struct offb_par default_par;
 
-    /*
-     *  Interface used by the world
-     */
-
-static int offb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
-                          u_int transp, struct fb_info *info);
-static int offb_blank(int blank, struct fb_info *info);
-
 #ifdef CONFIG_PPC32
 extern boot_infos_t *boot_infos;
 #endif
 
-static struct fb_ops offb_ops = {
-        .owner          = THIS_MODULE,
-        .fb_setcolreg   = offb_setcolreg,
-        .fb_blank       = offb_blank,
-        .fb_fillrect    = cfb_fillrect,
-        .fb_copyarea    = cfb_copyarea,
-        .fb_imageblit   = cfb_imageblit,
-};
+/* Definitions used by the Avivo palette hack */
+#define AVIVO_DC_LUT_RW_SELECT                  0x6480
+#define AVIVO_DC_LUT_RW_MODE                    0x6484
+#define AVIVO_DC_LUT_RW_INDEX                   0x6488
+#define AVIVO_DC_LUT_SEQ_COLOR                  0x648c
+#define AVIVO_DC_LUT_PWL_DATA                   0x6490
+#define AVIVO_DC_LUT_30_COLOR                   0x6494
+#define AVIVO_DC_LUT_READ_PIPE_SELECT           0x6498
+#define AVIVO_DC_LUT_WRITE_EN_MASK              0x649c
+#define AVIVO_DC_LUT_AUTOFILL                   0x64a0
+
+#define AVIVO_DC_LUTA_CONTROL                   0x64c0
+#define AVIVO_DC_LUTA_BLACK_OFFSET_BLUE         0x64c4
+#define AVIVO_DC_LUTA_BLACK_OFFSET_GREEN        0x64c8
+#define AVIVO_DC_LUTA_BLACK_OFFSET_RED          0x64cc
+#define AVIVO_DC_LUTA_WHITE_OFFSET_BLUE         0x64d0
+#define AVIVO_DC_LUTA_WHITE_OFFSET_GREEN        0x64d4
+#define AVIVO_DC_LUTA_WHITE_OFFSET_RED          0x64d8
+
+#define AVIVO_DC_LUTB_CONTROL                   0x6cc0
+#define AVIVO_DC_LUTB_BLACK_OFFSET_BLUE         0x6cc4
+#define AVIVO_DC_LUTB_BLACK_OFFSET_GREEN        0x6cc8
+#define AVIVO_DC_LUTB_BLACK_OFFSET_RED          0x6ccc
+#define AVIVO_DC_LUTB_WHITE_OFFSET_BLUE         0x6cd0
+#define AVIVO_DC_LUTB_WHITE_OFFSET_GREEN        0x6cd4
+#define AVIVO_DC_LUTB_WHITE_OFFSET_RED          0x6cd8
 
     /*
      *  Set a single color register. The values supplied are already
@@ -160,6 +171,17 @@ static int offb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
                 out_le32(((unsigned __iomem *) par->cmap_adr) + regno,
                          (red << 16 | green << 8 | blue));
                 break;
+        case cmap_avivo:
+                /* Write to both LUTs for now */
+                writel(1, par->cmap_adr + AVIVO_DC_LUT_RW_SELECT);
+                writeb(regno, par->cmap_adr + AVIVO_DC_LUT_RW_INDEX);
+                writel(((red) << 22) | ((green) << 12) | ((blue) << 2),
+                       par->cmap_adr + AVIVO_DC_LUT_30_COLOR);
+                writel(0, par->cmap_adr + AVIVO_DC_LUT_RW_SELECT);
+                writeb(regno, par->cmap_adr + AVIVO_DC_LUT_RW_INDEX);
+                writel(((red) << 22) | ((green) << 12) | ((blue) << 2),
+                       par->cmap_adr + AVIVO_DC_LUT_30_COLOR);
+                break;
         }
 
         return 0;
@@ -216,12 +238,59 @@ static int offb_blank(int blank, struct fb_info *info)
                                 out_le32(((unsigned __iomem *) par->cmap_adr) + i,
                                          0);
                                 break;
+                        case cmap_avivo:
+                                writel(1, par->cmap_adr + AVIVO_DC_LUT_RW_SELECT);
+                                writeb(i, par->cmap_adr + AVIVO_DC_LUT_RW_INDEX);
+                                writel(0, par->cmap_adr + AVIVO_DC_LUT_30_COLOR);
+                                writel(0, par->cmap_adr + AVIVO_DC_LUT_RW_SELECT);
+                                writeb(i, par->cmap_adr + AVIVO_DC_LUT_RW_INDEX);
+                                writel(0, par->cmap_adr + AVIVO_DC_LUT_30_COLOR);
+                                break;
                         }
         } else
                 fb_set_cmap(&info->cmap, info);
         return 0;
 }
 
+static int offb_set_par(struct fb_info *info)
+{
+        struct offb_par *par = (struct offb_par *) info->par;
+
+        /* On avivo, initialize palette control */
+        if (par->cmap_type == cmap_avivo) {
+                writel(0, par->cmap_adr + AVIVO_DC_LUTA_CONTROL);
+                writel(0, par->cmap_adr + AVIVO_DC_LUTA_BLACK_OFFSET_BLUE);
+                writel(0, par->cmap_adr + AVIVO_DC_LUTA_BLACK_OFFSET_GREEN);
+                writel(0, par->cmap_adr + AVIVO_DC_LUTA_BLACK_OFFSET_RED);
+                writel(0x0000ffff, par->cmap_adr + AVIVO_DC_LUTA_WHITE_OFFSET_BLUE);
+                writel(0x0000ffff, par->cmap_adr + AVIVO_DC_LUTA_WHITE_OFFSET_GREEN);
+                writel(0x0000ffff, par->cmap_adr + AVIVO_DC_LUTA_WHITE_OFFSET_RED);
+                writel(0, par->cmap_adr + AVIVO_DC_LUTB_CONTROL);
+                writel(0, par->cmap_adr + AVIVO_DC_LUTB_BLACK_OFFSET_BLUE);
+                writel(0, par->cmap_adr + AVIVO_DC_LUTB_BLACK_OFFSET_GREEN);
+                writel(0, par->cmap_adr + AVIVO_DC_LUTB_BLACK_OFFSET_RED);
+                writel(0x0000ffff, par->cmap_adr + AVIVO_DC_LUTB_WHITE_OFFSET_BLUE);
+                writel(0x0000ffff, par->cmap_adr + AVIVO_DC_LUTB_WHITE_OFFSET_GREEN);
+                writel(0x0000ffff, par->cmap_adr + AVIVO_DC_LUTB_WHITE_OFFSET_RED);
+                writel(1, par->cmap_adr + AVIVO_DC_LUT_RW_SELECT);
+                writel(0, par->cmap_adr + AVIVO_DC_LUT_RW_MODE);
+                writel(0x0000003f, par->cmap_adr + AVIVO_DC_LUT_WRITE_EN_MASK);
+                writel(0, par->cmap_adr + AVIVO_DC_LUT_RW_SELECT);
+                writel(0, par->cmap_adr + AVIVO_DC_LUT_RW_MODE);
+                writel(0x0000003f, par->cmap_adr + AVIVO_DC_LUT_WRITE_EN_MASK);
+        }
+        return 0;
+}
+
+static struct fb_ops offb_ops = {
+        .owner          = THIS_MODULE,
+        .fb_setcolreg   = offb_setcolreg,
+        .fb_set_par     = offb_set_par,
+        .fb_blank       = offb_blank,
+        .fb_fillrect    = cfb_fillrect,
+        .fb_copyarea    = cfb_copyarea,
+        .fb_imageblit   = cfb_imageblit,
+};
 
 static void __iomem *offb_map_reg(struct device_node *np, int index,
                                   unsigned long offset, unsigned long size)
@@ -245,6 +314,59 @@ static void __iomem *offb_map_reg(struct device_node *np, int index,
         return ioremap(taddr + offset, size);
 }
 
+static void offb_init_palette_hacks(struct fb_info *info, struct device_node *dp,
+                                    const char *name, unsigned long address)
+{
+        struct offb_par *par = (struct offb_par *) info->par;
+
+        if (dp && !strncmp(name, "ATY,Rage128", 11)) {
+                par->cmap_adr = offb_map_reg(dp, 2, 0, 0x1fff);
+                if (par->cmap_adr)
+                        par->cmap_type = cmap_r128;
+        } else if (dp && (!strncmp(name, "ATY,RageM3pA", 12)
+                          || !strncmp(name, "ATY,RageM3p12A", 14))) {
+                par->cmap_adr = offb_map_reg(dp, 2, 0, 0x1fff);
+                if (par->cmap_adr)
+                        par->cmap_type = cmap_M3A;
+        } else if (dp && !strncmp(name, "ATY,RageM3pB", 12)) {
+                par->cmap_adr = offb_map_reg(dp, 2, 0, 0x1fff);
+                if (par->cmap_adr)
+                        par->cmap_type = cmap_M3B;
+        } else if (dp && !strncmp(name, "ATY,Rage6", 9)) {
+                par->cmap_adr = offb_map_reg(dp, 1, 0, 0x1fff);
+                if (par->cmap_adr)
+                        par->cmap_type = cmap_radeon;
+        } else if (!strncmp(name, "ATY,", 4)) {
+                unsigned long base = address & 0xff000000UL;
+                par->cmap_adr =
+                        ioremap(base + 0x7ff000, 0x1000) + 0xcc0;
+                par->cmap_data = par->cmap_adr + 1;
+                par->cmap_type = cmap_m64;
+        } else if (dp && (of_device_is_compatible(dp, "pci1014,b7") ||
+                          of_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;
+        } else if (dp && !strncmp(name, "vga,Display-", 12)) {
+                /* Look for AVIVO initialized by SLOF */
+                struct device_node *pciparent = of_get_parent(dp);
+                const u32 *vid, *did;
+                vid = of_get_property(pciparent, "vendor-id", NULL);
+                did = of_get_property(pciparent, "device-id", NULL);
+                /* This will match most R5xx */
+                if (vid && did && *vid == 0x1002 &&
+                    ((*did >= 0x7100 && *did < 0x7800) ||
+                     (*did >= 0x9400))) {
+                        par->cmap_adr = offb_map_reg(pciparent, 2, 0, 0x10000);
+                        if (par->cmap_adr)
+                                par->cmap_type = cmap_avivo;
+                }
+                of_node_put(pciparent);
+        }
+        info->fix.visual = (par->cmap_type != cmap_unknown) ?
+                FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_STATIC_PSEUDOCOLOR;
+}
+
 static void __init offb_init_fb(const char *name, const char *full_name,
                                 int width, int height, int depth,
                                 int pitch, unsigned long address,
@@ -283,6 +405,7 @@ static void __init offb_init_fb(const char *name, const char *full_name,
 
         fix = &info->fix;
         var = &info->var;
+        info->par = par;
 
         strcpy(fix->id, "OFfb ");
         strncat(fix->id, name, sizeof(fix->id) - sizeof("OFfb "));
@@ -298,39 +421,9 @@ static void __init offb_init_fb(const char *name, const char *full_name,
         fix->type_aux = 0;
 
         par->cmap_type = cmap_unknown;
-        if (depth == 8) {
-                if (dp && !strncmp(name, "ATY,Rage128", 11)) {
-                        par->cmap_adr = offb_map_reg(dp, 2, 0, 0x1fff);
-                        if (par->cmap_adr)
-                                par->cmap_type = cmap_r128;
-                } else if (dp && (!strncmp(name, "ATY,RageM3pA", 12)
-                                  || !strncmp(name, "ATY,RageM3p12A", 14))) {
-                        par->cmap_adr = offb_map_reg(dp, 2, 0, 0x1fff);
-                        if (par->cmap_adr)
-                                par->cmap_type = cmap_M3A;
-                } else if (dp && !strncmp(name, "ATY,RageM3pB", 12)) {
-                        par->cmap_adr = offb_map_reg(dp, 2, 0, 0x1fff);
-                        if (par->cmap_adr)
-                                par->cmap_type = cmap_M3B;
-                } else if (dp && !strncmp(name, "ATY,Rage6", 9)) {
-                        par->cmap_adr = offb_map_reg(dp, 1, 0, 0x1fff);
-                        if (par->cmap_adr)
-                                par->cmap_type = cmap_radeon;
-                } else if (!strncmp(name, "ATY,", 4)) {
-                        unsigned long base = address & 0xff000000UL;
-                        par->cmap_adr =
-                            ioremap(base + 0x7ff000, 0x1000) + 0xcc0;
-                        par->cmap_data = par->cmap_adr + 1;
-                        par->cmap_type = cmap_m64;
-                } else if (dp && (of_device_is_compatible(dp, "pci1014,b7") ||
-                                  of_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;
-                }
-                fix->visual = (par->cmap_type != cmap_unknown) ?
-                        FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_STATIC_PSEUDOCOLOR;
-        } else
+        if (depth == 8)
+                offb_init_palette_hacks(info, dp, name, address);
+        else
                 fix->visual = FB_VISUAL_TRUECOLOR;
 
         var->xoffset = var->yoffset = 0;
@@ -395,7 +488,6 @@ static void __init offb_init_fb(const char *name, const char *full_name,
 
         info->fbops = &offb_ops;
         info->screen_base = ioremap(address, fix->smem_len);
-        info->par = par;
         info->pseudo_palette = (void *) (info + 1);
         info->flags = FBINFO_DEFAULT | foreign_endian;