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/*
* Generic fillrect for frame buffers with packed pixels of any depth.
*
* Copyright (C) 2000 James Simmons (jsimmons@linux-fbdev.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:
*
* The code for depths like 24 that don't have integer number of pixels per
* long is broken and needs to be fixed. For now I turned these types of
* mode off.
*
* 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.
*
*/
#include <linux/config.h>
#include <linux/module.h>
#include <linux/string.h>
#include <linux/fb.h>
#include <asm/types.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;
}
/*
* Create a pattern with the given pixel's color
*/
#if BITS_PER_LONG == 64
static inline unsigned long
pixel_to_pat( u32 bpp, u32 pixel)
{
switch (bpp) {
case 1:
return 0xfffffffffffffffful*pixel;
case 2:
return 0x5555555555555555ul*pixel;
case 4:
return 0x1111111111111111ul*pixel;
case 8:
return 0x0101010101010101ul*pixel;
case 12:
return 0x0001001001001001ul*pixel;
case 16:
return 0x0001000100010001ul*pixel;
case 24:
return 0x0000000001000001ul*pixel;
case 32:
return 0x0000000100000001ul*pixel;
default:
panic("pixel_to_pat(): unsupported pixelformat\n");
}
}
#else
static inline unsigned long
pixel_to_pat( u32 bpp, u32 pixel)
{
switch (bpp) {
case 1:
return 0xfffffffful*pixel;
case 2:
return 0x55555555ul*pixel;
case 4:
return 0x11111111ul*pixel;
case 8:
return 0x01010101ul*pixel;
case 12:
return 0x00001001ul*pixel;
case 16:
return 0x00010001ul*pixel;
case 24:
return 0x00000001ul*pixel;
case 32:
return 0x00000001ul*pixel;
default:
panic("pixel_to_pat(): unsupported pixelformat\n");
}
}
#endif
/*
* Aligned pattern fill using 32/64-bit memory accesses
*/
static void
bitfill_aligned(unsigned long __iomem *dst, int dst_idx, unsigned long pat, unsigned n, int bits)
{
unsigned long first, last;
if (!n)
return;
first = FB_SHIFT_HIGH(~0UL, dst_idx);
last = ~(FB_SHIFT_HIGH(~0UL, (dst_idx+n) % bits));
if (dst_idx+n <= bits) {
// Single word
if (last)
first &= last;
FB_WRITEL(comp(pat, FB_READL(dst), first), dst);
} else {
// Multiple destination words
// Leading bits
if (first!= ~0UL) {
FB_WRITEL(comp(pat, FB_READL(dst), first), dst);
dst++;
n -= bits - dst_idx;
}
// Main chunk
n /= bits;
while (n >= 8) {
FB_WRITEL(pat, dst++);
FB_WRITEL(pat, dst++);
FB_WRITEL(pat, dst++);
FB_WRITEL(pat, dst++);
FB_WRITEL(pat, dst++);
FB_WRITEL(pat, dst++);
FB_WRITEL(pat, dst++);
FB_WRITEL(pat, dst++);
n -= 8;
}
while (n--)
FB_WRITEL(pat, dst++);
// Trailing bits
if (last)
FB_WRITEL(comp(pat, FB_READL(dst), last), dst);
}
}
/*
* Unaligned generic pattern fill using 32/64-bit memory accesses
* The pattern must have been expanded to a full 32/64-bit value
* Left/right are the appropriate shifts to convert to the pattern to be
* used for the next 32/64-bit word
*/
static void
bitfill_unaligned(unsigned long __iomem *dst, int dst_idx, unsigned long pat,
int left, int right, unsigned n, int bits)
{
unsigned long first, last;
if (!n)
return;
first = FB_SHIFT_HIGH(~0UL, dst_idx);
last = ~(FB_SHIFT_HIGH(~0UL, (dst_idx+n) % bits));
if (dst_idx+n <= bits) {
// Single word
if (last)
first &= last;
FB_WRITEL(comp(pat, FB_READL(dst), first), dst);
} else {
// Multiple destination words
// Leading bits
if (first) {
FB_WRITEL(comp(pat, FB_READL(dst), first), dst);
dst++;
pat = pat << left | pat >> right;
n -= bits - dst_idx;
}
// Main chunk
n /= bits;
while (n >= 4) {
FB_WRITEL(pat, dst++);
pat = pat << left | pat >> right;
FB_WRITEL(pat, dst++);
pat = pat << left | pat >> right;
FB_WRITEL(pat, dst++);
pat = pat << left | pat >> right;
FB_WRITEL(pat, dst++);
pat = pat << left | pat >> right;
n -= 4;
}
while (n--) {
FB_WRITEL(pat, dst++);
pat = pat << left | pat >> right;
}
// Trailing bits
if (last)
FB_WRITEL(comp(pat, FB_READL(dst), first), dst);
}
}
/*
* Aligned pattern invert using 32/64-bit memory accesses
*/
static void
bitfill_aligned_rev(unsigned long __iomem *dst, int dst_idx, unsigned long pat, unsigned n, int bits)
{
unsigned long val = pat, dat;
unsigned long first, last;
if (!n)
return;
first = FB_SHIFT_HIGH(~0UL, dst_idx);
last = ~(FB_SHIFT_HIGH(~0UL, (dst_idx+n) % bits));
if (dst_idx+n <= bits) {
// Single word
if (last)
first &= last;
dat = FB_READL(dst);
FB_WRITEL(comp(dat ^ val, dat, first), dst);
} else {
// Multiple destination words
// Leading bits
if (first!=0UL) {
dat = FB_READL(dst);
FB_WRITEL(comp(dat ^ val, dat, first), dst);
dst++;
n -= bits - dst_idx;
}
// Main chunk
n /= bits;
while (n >= 8) {
FB_WRITEL(FB_READL(dst) ^ val, dst);
dst++;
FB_WRITEL(FB_READL(dst) ^ val, dst);
dst++;
FB_WRITEL(FB_READL(dst) ^ val, dst);
dst++;
FB_WRITEL(FB_READL(dst) ^ val, dst);
dst++;
FB_WRITEL(FB_READL(dst) ^ val, dst);
dst++;
FB_WRITEL(FB_READL(dst) ^ val, dst);
dst++;
FB_WRITEL(FB_READL(dst) ^ val, dst);
dst++;
FB_WRITEL(FB_READL(dst) ^ val, dst);
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