stifb: Implement hardware accelerated copyarea

This patch adds hardware assisted scrolling. The code is based upon the
following investigation: https://parisc.wiki.kernel.org/index.php/NGLE#Blitter

A simple 'time ls -la /usr/bin' test shows 1.6x speed increase over soft
copy and 2.3x increase over FBINFO_READS_FAST (prefer soft copy over
screen redraw) on Artist framebuffer.

Signed-off-by: Alex Ivanov <lausgans@gmail.com>
Signed-off-by: Helge Deller <deller@gmx.de>

1 files changed, 38 insertions, 2 deletions

diff --git a/drivers/video/fbdev/stifb.c b/drivers/video/fbdev/stifb.c
index 86621fabbb8b..735355b0e023 100644
--- a/drivers/video/fbdev/stifb.c
+++ b/drivers/video/fbdev/stifb.c
@@ -121,6 +121,7 @@ static int __initdata stifb_bpp_pref[MAX_STI_ROMS];
 #define REG_3           0x0004a0
 #define REG_4           0x000600
 #define REG_6           0x000800
+#define REG_7           0x000804
 #define REG_8           0x000820
 #define REG_9           0x000a04
 #define REG_10          0x018000
@@ -135,6 +136,8 @@ static int __initdata stifb_bpp_pref[MAX_STI_ROMS];
 #define REG_21          0x200218
 #define REG_22          0x0005a0
 #define REG_23          0x0005c0
+#define REG_24          0x000808
+#define REG_25          0x000b00
 #define REG_26          0x200118
 #define REG_27          0x200308
 #define REG_32          0x21003c
@@ -429,6 +432,9 @@ ARTIST_ENABLE_DISABLE_DISPLAY(struct stifb_info *fb, int enable)
 #define SET_LENXY_START_RECFILL(fb, lenxy) \
         WRITE_WORD(lenxy, fb, REG_9)
 
+#define SETUP_COPYAREA(fb) \
+        WRITE_BYTE(0, fb, REG_16b1)
+
 static void
 HYPER_ENABLE_DISABLE_DISPLAY(struct stifb_info *fb, int enable)
 {
@@ -1004,6 +1010,36 @@ stifb_blank(int blank_mode, struct fb_info *info)
         return 0;
 }
 
+static void
+stifb_copyarea(struct fb_info *info, const struct fb_copyarea *area)
+{
+        struct stifb_info *fb = container_of(info, struct stifb_info, info);
+
+        SETUP_COPYAREA(fb);
+
+        SETUP_HW(fb);
+        if (fb->info.var.bits_per_pixel == 32) {
+                WRITE_WORD(0xBBA0A000, fb, REG_10);
+
+                NGLE_REALLY_SET_IMAGE_PLANEMASK(fb, 0xffffffff);
+        } else {
+                WRITE_WORD(fb->id == S9000_ID_HCRX ? 0x13a02000 : 0x13a01000, fb, REG_10);
+
+                NGLE_REALLY_SET_IMAGE_PLANEMASK(fb, 0xff);
+        }
+
+        NGLE_QUICK_SET_IMAGE_BITMAP_OP(fb,
+                IBOvals(RopSrc, MaskAddrOffset(0),
+                BitmapExtent08, StaticReg(1),
+                DataDynamic, MaskOtc, BGx(0), FGx(0)));
+
+        WRITE_WORD(((area->sx << 16) | area->sy), fb, REG_24);
+        WRITE_WORD(((area->width << 16) | area->height), fb, REG_7);
+        WRITE_WORD(((area->dx << 16) | area->dy), fb, REG_25);
+
+        SETUP_FB(fb);
+}
+
 static void __init
 stifb_init_display(struct stifb_info *fb)
 {
@@ -1069,7 +1105,7 @@ static struct fb_ops stifb_ops = {
         .fb_setcolreg   = stifb_setcolreg,
         .fb_blank       = stifb_blank,
         .fb_fillrect    = cfb_fillrect,
-        .fb_copyarea    = cfb_copyarea,
+        .fb_copyarea    = stifb_copyarea,
         .fb_imageblit   = cfb_imageblit,
 };
 
@@ -1258,7 +1294,7 @@ static int __init stifb_init_fb(struct sti_struct *sti, int bpp_pref)
         info->fbops = &stifb_ops;
         info->screen_base = ioremap_nocache(REGION_BASE(fb,1), fix->smem_len);
         info->screen_size = fix->smem_len;
-        info->flags = FBINFO_DEFAULT;
+        info->flags = FBINFO_DEFAULT | FBINFO_HWACCEL_COPYAREA;
         info->pseudo_palette = &fb->pseudo_palette;
 
         /* This has to be done !!! */