405 lines
10 KiB
C
405 lines
10 KiB
C
/*
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* Generic function for frame buffer with packed pixels of any depth.
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*
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* Copyright (C) 1999-2005 James Simmons <jsimmons@www.infradead.org>
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file COPYING in the main directory of this archive for
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* more details.
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*
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* NOTES:
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*
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* This is for cfb packed pixels. Iplan and such are incorporated in the
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* drivers that need them.
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*
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* FIXME
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*
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* Also need to add code to deal with cards endians that are different than
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* the native cpu endians. I also need to deal with MSB position in the word.
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*
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* The two functions or copying forward and backward could be split up like
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* the ones for filling, i.e. in aligned and unaligned versions. This would
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* help moving some redundant computations and branches out of the loop, too.
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/string.h>
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#include <linux/fb.h>
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#include <linux/slab.h>
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#include <asm/types.h>
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#include <asm/io.h>
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#if BITS_PER_LONG == 32
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# define FB_WRITEL fb_writel
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# define FB_READL fb_readl
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#else
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# define FB_WRITEL fb_writeq
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# define FB_READL fb_readq
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#endif
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/*
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* Compose two values, using a bitmask as decision value
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* This is equivalent to (a & mask) | (b & ~mask)
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*/
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static inline unsigned long
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comp(unsigned long a, unsigned long b, unsigned long mask)
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{
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return ((a ^ b) & mask) ^ b;
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}
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/*
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* Generic bitwise copy algorithm
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*/
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static void
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bitcpy(unsigned long __iomem *dst, int dst_idx, const unsigned long __iomem *src,
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int src_idx, int bits, unsigned n)
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{
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unsigned long first, last;
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int const shift = dst_idx-src_idx;
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int left, right;
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first = FB_SHIFT_HIGH(~0UL, dst_idx);
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last = ~(FB_SHIFT_HIGH(~0UL, (dst_idx+n) % bits));
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if (!shift) {
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// Same alignment for source and dest
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if (dst_idx+n <= bits) {
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// Single word
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if (last)
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first &= last;
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FB_WRITEL( comp( FB_READL(src), FB_READL(dst), first), dst);
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} else {
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// Multiple destination words
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// Leading bits
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if (first != ~0UL) {
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FB_WRITEL( comp( FB_READL(src), FB_READL(dst), first), dst);
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dst++;
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src++;
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n -= bits - dst_idx;
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}
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// Main chunk
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n /= bits;
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while (n >= 8) {
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FB_WRITEL(FB_READL(src++), dst++);
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FB_WRITEL(FB_READL(src++), dst++);
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FB_WRITEL(FB_READL(src++), dst++);
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FB_WRITEL(FB_READL(src++), dst++);
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FB_WRITEL(FB_READL(src++), dst++);
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FB_WRITEL(FB_READL(src++), dst++);
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FB_WRITEL(FB_READL(src++), dst++);
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FB_WRITEL(FB_READL(src++), dst++);
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n -= 8;
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}
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while (n--)
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FB_WRITEL(FB_READL(src++), dst++);
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// Trailing bits
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if (last)
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FB_WRITEL( comp( FB_READL(src), FB_READL(dst), last), dst);
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}
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} else {
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unsigned long d0, d1;
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int m;
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// Different alignment for source and dest
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right = shift & (bits - 1);
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left = -shift & (bits - 1);
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if (dst_idx+n <= bits) {
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// Single destination word
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if (last)
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first &= last;
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if (shift > 0) {
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// Single source word
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FB_WRITEL( comp( FB_READL(src) >> right, FB_READL(dst), first), dst);
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} else if (src_idx+n <= bits) {
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// Single source word
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FB_WRITEL( comp(FB_READL(src) << left, FB_READL(dst), first), dst);
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} else {
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// 2 source words
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d0 = FB_READL(src++);
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d1 = FB_READL(src);
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FB_WRITEL( comp(d0<<left | d1>>right, FB_READL(dst), first), dst);
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}
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} else {
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// Multiple destination words
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/** We must always remember the last value read, because in case
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SRC and DST overlap bitwise (e.g. when moving just one pixel in
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1bpp), we always collect one full long for DST and that might
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overlap with the current long from SRC. We store this value in
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'd0'. */
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d0 = FB_READL(src++);
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// Leading bits
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if (shift > 0) {
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// Single source word
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FB_WRITEL( comp(d0 >> right, FB_READL(dst), first), dst);
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dst++;
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n -= bits - dst_idx;
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} else {
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// 2 source words
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d1 = FB_READL(src++);
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FB_WRITEL( comp(d0<<left | d1>>right, FB_READL(dst), first), dst);
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d0 = d1;
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dst++;
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n -= bits - dst_idx;
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}
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// Main chunk
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m = n % bits;
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n /= bits;
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while (n >= 4) {
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d1 = FB_READL(src++);
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FB_WRITEL(d0 << left | d1 >> right, dst++);
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d0 = d1;
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d1 = FB_READL(src++);
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FB_WRITEL(d0 << left | d1 >> right, dst++);
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d0 = d1;
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d1 = FB_READL(src++);
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FB_WRITEL(d0 << left | d1 >> right, dst++);
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d0 = d1;
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d1 = FB_READL(src++);
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FB_WRITEL(d0 << left | d1 >> right, dst++);
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d0 = d1;
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n -= 4;
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}
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while (n--) {
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d1 = FB_READL(src++);
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FB_WRITEL(d0 << left | d1 >> right, dst++);
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d0 = d1;
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}
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// Trailing bits
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if (last) {
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if (m <= right) {
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// Single source word
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FB_WRITEL( comp(d0 << left, FB_READL(dst), last), dst);
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} else {
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// 2 source words
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d1 = FB_READL(src);
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FB_WRITEL( comp(d0<<left | d1>>right, FB_READL(dst), last), dst);
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}
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}
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}
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}
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}
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/*
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* Generic bitwise copy algorithm, operating backward
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*/
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static void
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bitcpy_rev(unsigned long __iomem *dst, int dst_idx, const unsigned long __iomem *src,
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int src_idx, int bits, unsigned n)
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{
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unsigned long first, last;
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int shift;
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dst += (n-1)/bits;
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src += (n-1)/bits;
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if ((n-1) % bits) {
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dst_idx += (n-1) % bits;
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dst += dst_idx >> (ffs(bits) - 1);
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dst_idx &= bits - 1;
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src_idx += (n-1) % bits;
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src += src_idx >> (ffs(bits) - 1);
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src_idx &= bits - 1;
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}
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shift = dst_idx-src_idx;
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first = FB_SHIFT_LOW(~0UL, bits - 1 - dst_idx);
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last = ~(FB_SHIFT_LOW(~0UL, bits - 1 - ((dst_idx-n) % bits)));
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if (!shift) {
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// Same alignment for source and dest
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if ((unsigned long)dst_idx+1 >= n) {
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// Single word
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if (last)
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first &= last;
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FB_WRITEL( comp( FB_READL(src), FB_READL(dst), first), dst);
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} else {
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// Multiple destination words
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// Leading bits
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if (first != ~0UL) {
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FB_WRITEL( comp( FB_READL(src), FB_READL(dst), first), dst);
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dst--;
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src--;
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n -= dst_idx+1;
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}
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// Main chunk
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n /= bits;
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while (n >= 8) {
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FB_WRITEL(FB_READL(src--), dst--);
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FB_WRITEL(FB_READL(src--), dst--);
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FB_WRITEL(FB_READL(src--), dst--);
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FB_WRITEL(FB_READL(src--), dst--);
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FB_WRITEL(FB_READL(src--), dst--);
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FB_WRITEL(FB_READL(src--), dst--);
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FB_WRITEL(FB_READL(src--), dst--);
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FB_WRITEL(FB_READL(src--), dst--);
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n -= 8;
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}
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while (n--)
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FB_WRITEL(FB_READL(src--), dst--);
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// Trailing bits
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if (last)
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FB_WRITEL( comp( FB_READL(src), FB_READL(dst), last), dst);
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}
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} else {
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// Different alignment for source and dest
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int const left = -shift & (bits-1);
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int const right = shift & (bits-1);
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if ((unsigned long)dst_idx+1 >= n) {
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// Single destination word
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if (last)
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first &= last;
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if (shift < 0) {
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// Single source word
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FB_WRITEL( comp( FB_READL(src)<<left, FB_READL(dst), first), dst);
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} else if (1+(unsigned long)src_idx >= n) {
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// Single source word
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FB_WRITEL( comp( FB_READL(src)>>right, FB_READL(dst), first), dst);
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} else {
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// 2 source words
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FB_WRITEL( comp( (FB_READL(src)>>right | FB_READL(src-1)<<left), FB_READL(dst), first), dst);
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}
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} else {
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// Multiple destination words
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/** We must always remember the last value read, because in case
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SRC and DST overlap bitwise (e.g. when moving just one pixel in
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1bpp), we always collect one full long for DST and that might
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overlap with the current long from SRC. We store this value in
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'd0'. */
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unsigned long d0, d1;
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int m;
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d0 = FB_READL(src--);
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// Leading bits
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if (shift < 0) {
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// Single source word
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FB_WRITEL( comp( (d0 << left), FB_READL(dst), first), dst);
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} else {
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// 2 source words
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d1 = FB_READL(src--);
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FB_WRITEL( comp( (d0>>right | d1<<left), FB_READL(dst), first), dst);
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d0 = d1;
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}
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dst--;
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n -= dst_idx+1;
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// Main chunk
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m = n % bits;
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n /= bits;
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while (n >= 4) {
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d1 = FB_READL(src--);
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FB_WRITEL(d0 >> right | d1 << left, dst--);
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d0 = d1;
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d1 = FB_READL(src--);
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FB_WRITEL(d0 >> right | d1 << left, dst--);
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d0 = d1;
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d1 = FB_READL(src--);
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FB_WRITEL(d0 >> right | d1 << left, dst--);
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d0 = d1;
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d1 = FB_READL(src--);
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FB_WRITEL(d0 >> right | d1 << left, dst--);
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d0 = d1;
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n -= 4;
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}
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while (n--) {
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d1 = FB_READL(src--);
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FB_WRITEL(d0 >> right | d1 << left, dst--);
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d0 = d1;
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}
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// Trailing bits
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if (last) {
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if (m <= left) {
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// Single source word
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FB_WRITEL( comp(d0 >> right, FB_READL(dst), last), dst);
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} else {
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// 2 source words
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d1 = FB_READL(src);
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FB_WRITEL( comp(d0>>right | d1<<left, FB_READL(dst), last), dst);
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}
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}
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}
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}
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}
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void cfb_copyarea(struct fb_info *p, const struct fb_copyarea *area)
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{
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u32 dx = area->dx, dy = area->dy, sx = area->sx, sy = area->sy;
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u32 height = area->height, width = area->width;
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unsigned long const bits_per_line = p->fix.line_length*8u;
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unsigned long __iomem *dst = NULL, *src = NULL;
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int bits = BITS_PER_LONG, bytes = bits >> 3;
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int dst_idx = 0, src_idx = 0, rev_copy = 0;
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if (p->state != FBINFO_STATE_RUNNING)
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return;
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/* if the beginning of the target area might overlap with the end of
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the source area, be have to copy the area reverse. */
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if ((dy == sy && dx > sx) || (dy > sy)) {
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dy += height;
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sy += height;
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rev_copy = 1;
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}
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// split the base of the framebuffer into a long-aligned address and the
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// index of the first bit
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dst = src = (unsigned long __iomem *)((unsigned long)p->screen_base & ~(bytes-1));
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dst_idx = src_idx = 8*((unsigned long)p->screen_base & (bytes-1));
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// add offset of source and target area
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dst_idx += dy*bits_per_line + dx*p->var.bits_per_pixel;
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src_idx += sy*bits_per_line + sx*p->var.bits_per_pixel;
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if (p->fbops->fb_sync)
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p->fbops->fb_sync(p);
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if (rev_copy) {
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while (height--) {
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dst_idx -= bits_per_line;
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src_idx -= bits_per_line;
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dst += dst_idx >> (ffs(bits) - 1);
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dst_idx &= (bytes - 1);
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src += src_idx >> (ffs(bits) - 1);
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src_idx &= (bytes - 1);
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bitcpy_rev(dst, dst_idx, src, src_idx, bits,
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width*p->var.bits_per_pixel);
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}
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} else {
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while (height--) {
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dst += dst_idx >> (ffs(bits) - 1);
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dst_idx &= (bytes - 1);
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src += src_idx >> (ffs(bits) - 1);
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src_idx &= (bytes - 1);
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bitcpy(dst, dst_idx, src, src_idx, bits,
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width*p->var.bits_per_pixel);
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dst_idx += bits_per_line;
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src_idx += bits_per_line;
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}
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}
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}
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EXPORT_SYMBOL(cfb_copyarea);
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MODULE_AUTHOR("James Simmons <jsimmons@users.sf.net>");
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MODULE_DESCRIPTION("Generic software accelerated copyarea");
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MODULE_LICENSE("GPL");
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