pm2fb: Permedia 2V hardware cursor support

This patch adds hardware cursor support for Permedia 2V chips.
The hardware cursor is disabled by default. It does not blink - the
same issue is mentioned in the x11 driver.

Signed-off-by: Krzysztof Helt <krzysztof.h1@wp.pl>
Signed-off-by: Antonino Daplas <adaplas@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2 files changed, 139 insertions, 0 deletions

diff --git a/drivers/video/pm2fb.c b/drivers/video/pm2fb.c
index 19cbde192956..53dd639e9753 100644
--- a/drivers/video/pm2fb.c
+++ b/drivers/video/pm2fb.c
@@ -66,6 +66,7 @@
 /*
  * Driver data
  */
+static int hwcursor;
 static char *mode __devinitdata;
 
 /*
@@ -1245,6 +1246,136 @@ static void pm2fb_imageblit(struct fb_info *info, const struct fb_image *image)
         pm2_WR(par, PM2R_SCISSOR_MODE, 0);
 }
 
+/*
+ *      Hardware cursor support.
+ */
+static const u8 cursor_bits_lookup[16] = {
+        0x00, 0x40, 0x10, 0x50, 0x04, 0x44, 0x14, 0x54,
+        0x01, 0x41, 0x11, 0x51, 0x05, 0x45, 0x15, 0x55
+};
+
+static int pm2vfb_cursor(struct fb_info *info, struct fb_cursor *cursor)
+{
+        struct pm2fb_par *par = info->par;
+        u8 mode;
+
+        if (!hwcursor)
+                return -EINVAL; /* just to force soft_cursor() call */
+
+        /* Too large of a cursor or wrong bpp :-( */
+        if (cursor->image.width > 64 ||
+            cursor->image.height > 64 ||
+            cursor->image.depth > 1)
+                return -EINVAL;
+
+        mode = PM2F_CURSORMODE_TYPE_X;
+        if (cursor->enable)
+                mode |= PM2F_CURSORMODE_CURSOR_ENABLE;
+
+        pm2v_RDAC_WR(par, PM2VI_RD_CURSOR_MODE, mode);
+
+        /*
+         * If the cursor is not be changed this means either we want the
+         * current cursor state (if enable is set) or we want to query what
+         * we can do with the cursor (if enable is not set)
+         */
+        if (!cursor->set)
+                return 0;
+
+        if (cursor->set & FB_CUR_SETPOS) {
+                int x = cursor->image.dx - info->var.xoffset;
+                int y = cursor->image.dy - info->var.yoffset;
+
+                pm2v_RDAC_WR(par, PM2VI_RD_CURSOR_X_LOW, x & 0xff);
+                pm2v_RDAC_WR(par, PM2VI_RD_CURSOR_X_HIGH, (x >> 8) & 0xf);
+                pm2v_RDAC_WR(par, PM2VI_RD_CURSOR_Y_LOW, y & 0xff);
+                pm2v_RDAC_WR(par, PM2VI_RD_CURSOR_Y_HIGH, (y >> 8) & 0xf);
+        }
+
+        if (cursor->set & FB_CUR_SETHOT) {
+                pm2v_RDAC_WR(par, PM2VI_RD_CURSOR_X_HOT,
+                             cursor->hot.x & 0x3f);
+                pm2v_RDAC_WR(par, PM2VI_RD_CURSOR_Y_HOT,
+                             cursor->hot.y & 0x3f);
+        }
+
+        if (cursor->set & FB_CUR_SETCMAP) {
+                u32 fg_idx = cursor->image.fg_color;
+                u32 bg_idx = cursor->image.bg_color;
+                struct fb_cmap cmap = info->cmap;
+
+                /* the X11 driver says one should use these color registers */
+                pm2_WR(par, PM2VR_RD_INDEX_HIGH, PM2VI_RD_CURSOR_PALETTE >> 8);
+                pm2v_RDAC_WR(par, PM2VI_RD_CURSOR_PALETTE + 0,
+                             cmap.red[bg_idx] >> 8 );
+                pm2v_RDAC_WR(par, PM2VI_RD_CURSOR_PALETTE + 1,
+                             cmap.green[bg_idx] >> 8 );
+                pm2v_RDAC_WR(par, PM2VI_RD_CURSOR_PALETTE + 2,
+                             cmap.blue[bg_idx] >> 8 );
+
+                pm2v_RDAC_WR(par, PM2VI_RD_CURSOR_PALETTE + 3,
+                             cmap.red[fg_idx] >> 8 );
+                pm2v_RDAC_WR(par, PM2VI_RD_CURSOR_PALETTE + 4,
+                             cmap.green[fg_idx] >> 8 );
+                pm2v_RDAC_WR(par, PM2VI_RD_CURSOR_PALETTE + 5,
+                             cmap.blue[fg_idx] >> 8 );
+                pm2_WR(par, PM2VR_RD_INDEX_HIGH, 0);
+        }
+
+        if (cursor->set & (FB_CUR_SETSHAPE | FB_CUR_SETIMAGE)) {
+                u8 *bitmap = (u8 *)cursor->image.data;
+                u8 *mask = (u8 *)cursor->mask;
+                int i;
+                int pos = PM2VI_RD_CURSOR_PATTERN;
+
+                for (i = 0; i < cursor->image.height; i++) {
+                        int j = (cursor->image.width + 7) >> 3;
+                        int k = 8 - j;
+
+                        pm2_WR(par, PM2VR_RD_INDEX_HIGH, pos >> 8);
+
+                        for (; j > 0; j--) {
+                                u8 data = *bitmap ^ *mask;
+
+                                if (cursor->rop == ROP_COPY)
+                                        data = *mask & *bitmap;
+                                /* Upper 4 bits of bitmap data */
+                                pm2v_RDAC_WR(par, pos++,
+                                        cursor_bits_lookup[data >> 4] |
+                                        (cursor_bits_lookup[*mask >> 4] << 1));
+                                /* Lower 4 bits of bitmap */
+                                pm2v_RDAC_WR(par, pos++,
+                                        cursor_bits_lookup[data & 0xf] |
+                                        (cursor_bits_lookup[*mask & 0xf] << 1));
+                                bitmap++;
+                                mask++;
+                        }
+                        for (; k > 0; k--) {
+                                pm2v_RDAC_WR(par, pos++, 0);
+                                pm2v_RDAC_WR(par, pos++, 0);
+                        }
+                }
+
+                while (pos < (1024 + PM2VI_RD_CURSOR_PATTERN)) {
+                        pm2_WR(par, PM2VR_RD_INDEX_HIGH, pos >> 8);
+                        pm2v_RDAC_WR(par, pos++, 0);
+                }
+
+                pm2_WR(par, PM2VR_RD_INDEX_HIGH, 0);
+        }
+        return 0;
+}
+
+static int pm2fb_cursor(struct fb_info *info, struct fb_cursor *cursor)
+{
+        struct pm2fb_par *par = info->par;
+
+        if (par->type == PM2_TYPE_PERMEDIA2V)
+                return pm2vfb_cursor(info, cursor);
+
+        return -ENXIO;
+}
+
 /* ------------ Hardware Independent Functions ------------ */
 
 /*
@@ -1262,6 +1393,7 @@ static struct fb_ops pm2fb_ops = {
         .fb_copyarea    = pm2fb_copyarea,
         .fb_imageblit   = pm2fb_imageblit,
         .fb_sync        = pm2fb_sync,
+        .fb_cursor      = pm2fb_cursor,
 };
 
 /*
@@ -1550,6 +1682,8 @@ static int __init pm2fb_setup(char *options)
                         lowhsync = 1;
                 else if (!strcmp(this_opt, "lowvsync"))
                         lowvsync = 1;
+                else if (!strncmp(this_opt, "hwcursor=", 9))
+                        hwcursor = simple_strtoul(this_opt + 9, NULL, 0);
 #ifdef CONFIG_MTRR
                 else if (!strncmp(this_opt, "nomtrr", 6))
                         nomtrr = 1;
@@ -1601,6 +1735,9 @@ module_param(lowvsync, bool, 0);
 MODULE_PARM_DESC(lowvsync, "Force vertical sync low regardless of mode");
 module_param(noaccel, bool, 0);
 MODULE_PARM_DESC(noaccel, "Disable acceleration");
+module_param(hwcursor, int, 0644);
+MODULE_PARM_DESC(hwcursor, "Enable hardware cursor "
+                        "(1=enable, 0=disable, default=0)");
 #ifdef CONFIG_MTRR
 module_param(nomtrr, bool, 0);
 MODULE_PARM_DESC(nomtrr, "Disable MTRR support (0 or 1=disabled) (default=0)");
diff --git a/include/video/permedia2.h b/include/video/permedia2.h
index cf1d95bce412..c6575b834fef 100644
--- a/include/video/permedia2.h
+++ b/include/video/permedia2.h
@@ -232,6 +232,8 @@
 #define PM2F_APERTURE_STANDARD                          0
 #define PM2F_APERTURE_BYTESWAP                          1
 #define PM2F_APERTURE_HALFWORDSWAP                      2
+#define PM2F_CURSORMODE_CURSOR_ENABLE                   (1 << 0)
+#define PM2F_CURSORMODE_TYPE_X                          (1 << 4)
 
 typedef enum {
         PM2_TYPE_PERMEDIA2,