[PATCH] stifb: Implement hardware accelerated copyarea

[lausgans@gmail.com]

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.

Thanks!

Signed-off-by: Alex Ivanov <lausgans@gmail.com>

diff --git a/drivers/video/fbdev/stifb.c b/drivers/video/fbdev/stifb.c
index 86621fa..735355b 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 !!! */