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-rw-r--r--drivers/video/cfbcopyarea.c441
1 files changed, 441 insertions, 0 deletions
diff --git a/drivers/video/cfbcopyarea.c b/drivers/video/cfbcopyarea.c
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index 000000000000..67711f7b11b1
--- /dev/null
+++ b/drivers/video/cfbcopyarea.c
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+/*
+ * Generic function for frame buffer with packed pixels of any depth.
+ *
+ * Copyright (C) 1999-2005 James Simmons <jsimmons@www.infradead.org>
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file COPYING in the main directory of this archive for
+ * more details.
+ *
+ * NOTES:
+ *
+ * This is for cfb packed pixels. Iplan and such are incorporated in the
+ * drivers that need them.
+ *
+ * FIXME
+ *
+ * Also need to add code to deal with cards endians that are different than
+ * the native cpu endians. I also need to deal with MSB position in the word.
+ *
+ * The two functions or copying forward and backward could be split up like
+ * the ones for filling, i.e. in aligned and unaligned versions. This would
+ * help moving some redundant computations and branches out of the loop, too.
+ */
+
+
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/fb.h>
+#include <linux/slab.h>
+#include <asm/types.h>
+#include <asm/io.h>
+
+#if BITS_PER_LONG == 32
+# define FB_WRITEL fb_writel
+# define FB_READL fb_readl
+#else
+# define FB_WRITEL fb_writeq
+# define FB_READL fb_readq
+#endif
+
+ /*
+ * Compose two values, using a bitmask as decision value
+ * This is equivalent to (a & mask) | (b & ~mask)
+ */
+
+static inline unsigned long
+comp(unsigned long a, unsigned long b, unsigned long mask)
+{
+ return ((a ^ b) & mask) ^ b;
+}
+
+ /*
+ * Generic bitwise copy algorithm
+ */
+
+static void
+bitcpy(unsigned long __iomem *dst, int dst_idx, const unsigned long __iomem *src,
+ int src_idx, int bits, unsigned n)
+{
+ unsigned long first, last;
+ int const shift = dst_idx-src_idx;
+ int left, right;
+
+ first = ~0UL >> dst_idx;
+ last = ~(~0UL >> ((dst_idx+n) % bits));
+
+ if (!shift) {
+ // Same alignment for source and dest
+
+ if (dst_idx+n <= bits) {
+ // Single word
+ if (last)
+ first &= last;
+ FB_WRITEL( comp( FB_READL(src), FB_READL(dst), first), dst);
+ } else {
+ // Multiple destination words
+
+ // Leading bits
+ if (first != ~0UL) {
+ FB_WRITEL( comp( FB_READL(src), FB_READL(dst), first), dst);
+ dst++;
+ src++;
+ n -= bits - dst_idx;
+ }
+
+ // Main chunk
+ n /= bits;
+ while (n >= 8) {
+ FB_WRITEL(FB_READL(src++), dst++);
+ FB_WRITEL(FB_READL(src++), dst++);
+ FB_WRITEL(FB_READL(src++), dst++);
+ FB_WRITEL(FB_READL(src++), dst++);
+ FB_WRITEL(FB_READL(src++), dst++);
+ FB_WRITEL(FB_READL(src++), dst++);
+ FB_WRITEL(FB_READL(src++), dst++);
+ FB_WRITEL(FB_READL(src++), dst++);
+ n -= 8;
+ }
+ while (n--)
+ FB_WRITEL(FB_READL(src++), dst++);
+
+ // Trailing bits
+ if (last)
+ FB_WRITEL( comp( FB_READL(src), FB_READL(dst), last), dst);
+ }
+ } else {
+ unsigned long d0, d1;
+ int m;
+ // Different alignment for source and dest
+
+ right = shift & (bits - 1);
+ left = -shift & (bits - 1);
+
+ if (dst_idx+n <= bits) {
+ // Single destination word
+ if (last)
+ first &= last;
+ if (shift > 0) {
+ // Single source word
+ FB_WRITEL( comp( FB_READL(src) >> right, FB_READL(dst), first), dst);
+ } else if (src_idx+n <= bits) {
+ // Single source word
+ FB_WRITEL( comp(FB_READL(src) << left, FB_READL(dst), first), dst);
+ } else {
+ // 2 source words
+ d0 = FB_READL(src++);
+ d1 = FB_READL(src);
+ FB_WRITEL( comp(d0<<left | d1>>right, FB_READL(dst), first), dst);
+ }
+ } else {
+ // Multiple destination words
+ /** We must always remember the last value read, because in case
+ SRC and DST overlap bitwise (e.g. when moving just one pixel in
+ 1bpp), we always collect one full long for DST and that might
+ overlap with the current long from SRC. We store this value in
+ 'd0'. */
+ d0 = FB_READL(src++);
+ // Leading bits
+ if (shift > 0) {
+ // Single source word
+ FB_WRITEL( comp(d0 >> right, FB_READL(dst), first), dst);
+ dst++;
+ n -= bits - dst_idx;
+ } else {
+ // 2 source words
+ d1 = FB_READL(src++);
+ FB_WRITEL( comp(d0<<left | d1>>right, FB_READL(dst), first), dst);
+ d0 = d1;
+ dst++;
+ n -= bits - dst_idx;
+ }
+
+ // Main chunk
+ m = n % bits;
+ n /= bits;
+ while (n >= 4) {
+ d1 = FB_READL(src++);
+ FB_WRITEL(d0 << left | d1 >> right, dst++);
+ d0 = d1;
+ d1 = FB_READL(src++);
+ FB_WRITEL(d0 << left | d1 >> right, dst++);
+ d0 = d1;
+ d1 = FB_READL(src++);
+ FB_WRITEL(d0 << left | d1 >> right, dst++);
+ d0 = d1;
+ d1 = FB_READL(src++);
+ FB_WRITEL(d0 << left | d1 >> right, dst++);
+ d0 = d1;
+ n -= 4;
+ }
+ while (n--) {
+ d1 = FB_READL(src++);
+ FB_WRITEL(d0 << left | d1 >> right, dst++);
+ d0 = d1;
+ }
+
+ // Trailing bits
+ if (last) {
+ if (m <= right) {
+ // Single source word
+ FB_WRITEL( comp(d0 << left, FB_READL(dst), last), dst);
+ } else {
+ // 2 source words
+ d1 = FB_READL(src);
+ FB_WRITEL( comp(d0<<left | d1>>right, FB_READL(dst), last), dst);
+ }
+ }
+ }
+ }
+}
+
+ /*
+ * Generic bitwise copy algorithm, operating backward
+ */
+
+static void
+bitcpy_rev(unsigned long __iomem *dst, int dst_idx, const unsigned long __iomem *src,
+ int src_idx, int bits, unsigned n)
+{
+ unsigned long first, last;
+ int shift;
+
+ dst += (n-1)/bits;
+ src += (n-1)/bits;
+ if ((n-1) % bits) {
+ dst_idx += (n-1) % bits;
+ dst += dst_idx >> (ffs(bits) - 1);
+ dst_idx &= bits - 1;
+ src_idx += (n-1) % bits;
+ src += src_idx >> (ffs(bits) - 1);
+ src_idx &= bits - 1;
+ }
+
+ shift = dst_idx-src_idx;
+
+ first = ~0UL << (bits - 1 - dst_idx);
+ last = ~(~0UL << (bits - 1 - ((dst_idx-n) % bits)));
+
+ if (!shift) {
+ // Same alignment for source and dest
+
+ if ((unsigned long)dst_idx+1 >= n) {
+ // Single word
+ if (last)
+ first &= last;
+ FB_WRITEL( comp( FB_READL(src), FB_READL(dst), first), dst);
+ } else {
+ // Multiple destination words
+
+ // Leading bits
+ if (first != ~0UL) {
+ FB_WRITEL( comp( FB_READL(src), FB_READL(dst), first), dst);
+ dst--;
+ src--;
+ n -= dst_idx+1;
+ }
+
+ // Main chunk
+ n /= bits;
+ while (n >= 8) {
+ FB_WRITEL(FB_READL(src--), dst--);
+ FB_WRITEL(FB_READL(src--), dst--);
+ FB_WRITEL(FB_READL(src--), dst--);
+ FB_WRITEL(FB_READL(src--), dst--);
+ FB_WRITEL(FB_READL(src--), dst--);
+ FB_WRITEL(FB_READL(src--), dst--);
+ FB_WRITEL(FB_READL(src--), dst--);
+ FB_WRITEL(FB_READL(src--), dst--);
+ n -= 8;
+ }
+ while (n--)
+ FB_WRITEL(FB_READL(src--), dst--);
+
+ // Trailing bits
+ if (last)
+ FB_WRITEL( comp( FB_READL(src), FB_READL(dst), last), dst);
+ }
+ } else {
+ // Different alignment for source and dest
+
+ int const left = -shift & (bits-1);
+ int const right = shift & (bits-1);
+
+ if ((unsigned long)dst_idx+1 >= n) {
+ // Single destination word
+ if (last)
+ first &= last;
+ if (shift < 0) {
+ // Single source word
+ FB_WRITEL( comp( FB_READL(src)<<left, FB_READL(dst), first), dst);
+ } else if (1+(unsigned long)src_idx >= n) {
+ // Single source word
+ FB_WRITEL( comp( FB_READL(src)>>right, FB_READL(dst), first), dst);
+ } else {
+ // 2 source words
+ FB_WRITEL( comp( (FB_READL(src)>>right | FB_READL(src-1)<<left), FB_READL(dst), first), dst);
+ }
+ } else {
+ // Multiple destination words
+ /** We must always remember the last value read, because in case
+ SRC and DST overlap bitwise (e.g. when moving just one pixel in
+ 1bpp), we always collect one full long for DST and that might
+ overlap with the current long from SRC. We store this value in
+ 'd0'. */
+ unsigned long d0, d1;
+ int m;
+
+ d0 = FB_READL(src--);
+ // Leading bits
+ if (shift < 0) {
+ // Single source word
+ FB_WRITEL( comp( (d0 << left), FB_READL(dst), first), dst);
+ } else {
+ // 2 source words
+ d1 = FB_READL(src--);
+ FB_WRITEL( comp( (d0>>right | d1<<left), FB_READL(dst), first), dst);
+ d0 = d1;
+ }
+ dst--;
+ n -= dst_idx+1;
+
+ // Main chunk
+ m = n % bits;
+ n /= bits;
+ while (n >= 4) {
+ d1 = FB_READL(src--);
+ FB_WRITEL(d0 >> right | d1 << left, dst--);
+ d0 = d1;
+ d1 = FB_READL(src--);
+ FB_WRITEL(d0 >> right | d1 << left, dst--);
+ d0 = d1;
+ d1 = FB_READL(src--);
+ FB_WRITEL(d0 >> right | d1 << left, dst--);
+ d0 = d1;
+ d1 = FB_READL(src--);
+ FB_WRITEL(d0 >> right | d1 << left, dst--);
+ d0 = d1;
+ n -= 4;
+ }
+ while (n--) {
+ d1 = FB_READL(src--);
+ FB_WRITEL(d0 >> right | d1 << left, dst--);
+ d0 = d1;
+ }
+
+ // Trailing bits
+ if (last) {
+ if (m <= left) {
+ // Single source word
+ FB_WRITEL( comp(d0 >> right, FB_READL(dst), last), dst);
+ } else {
+ // 2 source words
+ d1 = FB_READL(src);
+ FB_WRITEL( comp(d0>>right | d1<<left, FB_READL(dst), last), dst);
+ }
+ }
+ }
+ }
+}
+
+void cfb_copyarea(struct fb_info *p, const struct fb_copyarea *area)
+{
+ u32 dx = area->dx, dy = area->dy, sx = area->sx, sy = area->sy;
+ u32 height = area->height, width = area->width;
+ unsigned long const bits_per_line = p->fix.line_length*8u;
+ unsigned long __iomem *dst = NULL, *src = NULL;
+ int bits = BITS_PER_LONG, bytes = bits >> 3;
+ int dst_idx = 0, src_idx = 0, rev_copy = 0;
+ int x2, y2, vxres, vyres;
+
+ if (p->state != FBINFO_STATE_RUNNING)
+ return;
+
+ /* We want rotation but lack hardware to do it for us. */
+ if (!p->fbops->fb_rotate && p->var.rotate) {
+ }
+
+ vxres = p->var.xres_virtual;
+ vyres = p->var.yres_virtual;
+
+ if (area->dx > vxres || area->sx > vxres ||
+ area->dy > vyres || area->sy > vyres)
+ return;
+
+ /* clip the destination
+ * We could use hardware clipping but on many cards you get around
+ * hardware clipping by writing to framebuffer directly.
+ */
+ x2 = area->dx + area->width;
+ y2 = area->dy + area->height;
+ dx = area->dx > 0 ? area->dx : 0;
+ dy = area->dy > 0 ? area->dy : 0;
+ x2 = x2 < vxres ? x2 : vxres;
+ y2 = y2 < vyres ? y2 : vyres;
+ width = x2 - dx;
+ height = y2 - dy;
+
+ if ((width==0) ||(height==0))
+ return;
+
+ /* update sx1,sy1 */
+ sx += (dx - area->dx);
+ sy += (dy - area->dy);
+
+ /* the source must be completely inside the virtual screen */
+ if (sx < 0 || sy < 0 || (sx + width) > vxres || (sy + height) > vyres)
+ return;
+
+ /* if the beginning of the target area might overlap with the end of
+ the source area, be have to copy the area reverse. */
+ if ((dy == sy && dx > sx) || (dy > sy)) {
+ dy += height;
+ sy += height;
+ rev_copy = 1;
+ }
+
+ // split the base of the framebuffer into a long-aligned address and the
+ // index of the first bit
+ dst = src = (unsigned long __iomem *)((unsigned long)p->screen_base & ~(bytes-1));
+ dst_idx = src_idx = 8*((unsigned long)p->screen_base & (bytes-1));
+ // add offset of source and target area
+ dst_idx += dy*bits_per_line + dx*p->var.bits_per_pixel;
+ src_idx += sy*bits_per_line + sx*p->var.bits_per_pixel;
+
+ if (p->fbops->fb_sync)
+ p->fbops->fb_sync(p);
+
+ if (rev_copy) {
+ while (height--) {
+ dst_idx -= bits_per_line;
+ src_idx -= bits_per_line;
+ dst += dst_idx >> (ffs(bits) - 1);
+ dst_idx &= (bytes - 1);
+ src += src_idx >> (ffs(bits) - 1);
+ src_idx &= (bytes - 1);
+ bitcpy_rev(dst, dst_idx, src, src_idx, bits,
+ width*p->var.bits_per_pixel);
+ }
+ } else {
+ while (height--) {
+ dst += dst_idx >> (ffs(bits) - 1);
+ dst_idx &= (bytes - 1);
+ src += src_idx >> (ffs(bits) - 1);
+ src_idx &= (bytes - 1);
+ bitcpy(dst, dst_idx, src, src_idx, bits,
+ width*p->var.bits_per_pixel);
+ dst_idx += bits_per_line;
+ src_idx += bits_per_line;
+ }
+ }
+}
+
+EXPORT_SYMBOL(cfb_copyarea);
+
+MODULE_AUTHOR("James Simmons <jsimmons@users.sf.net>");
+MODULE_DESCRIPTION("Generic software accelerated copyarea");
+MODULE_LICENSE("GPL");
+
generated by cgit v1.2.3 (git 2.0.4) at 2024-11-17 16:46:14 +0000