diff options
Diffstat (limited to 'drivers/video/cfbcopyarea.c')
| -rw-r--r-- | drivers/video/cfbcopyarea.c | 431 |
1 files changed, 431 insertions, 0 deletions
diff --git a/drivers/video/cfbcopyarea.c b/drivers/video/cfbcopyarea.c new file mode 100644 index 00000000..bb5a96b1 --- /dev/null +++ b/drivers/video/cfbcopyarea.c @@ -0,0 +1,431 @@ +/* + * 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/module.h> +#include <linux/kernel.h> +#include <linux/string.h> +#include <linux/fb.h> +#include <asm/types.h> +#include <asm/io.h> +#include "fb_draw.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 + + /* + * Generic bitwise copy algorithm + */ + +static void +bitcpy(struct fb_info *p, unsigned long __iomem *dst, int dst_idx, + const unsigned long __iomem *src, int src_idx, int bits, + unsigned n, u32 bswapmask) +{ + unsigned long first, last; + int const shift = dst_idx-src_idx; + int left, right; + + first = fb_shifted_pixels_mask_long(p, dst_idx, bswapmask); + last = ~fb_shifted_pixels_mask_long(p, (dst_idx+n) % bits, bswapmask); + + 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 { + /* Different alignment for source and dest */ + unsigned long d0, d1; + int m; + + right = shift & (bits - 1); + left = -shift & (bits - 1); + bswapmask &= shift; + + if (dst_idx+n <= bits) { + // Single destination word + if (last) + first &= last; + d0 = FB_READL(src); + d0 = fb_rev_pixels_in_long(d0, bswapmask); + if (shift > 0) { + // Single source word + d0 >>= right; + } else if (src_idx+n <= bits) { + // Single source word + d0 <<= left; + } else { + // 2 source words + d1 = FB_READL(src + 1); + d1 = fb_rev_pixels_in_long(d1, bswapmask); + d0 = d0<<left | d1>>right; + } + d0 = fb_rev_pixels_in_long(d0, bswapmask); + FB_WRITEL(comp(d0, 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++); + d0 = fb_rev_pixels_in_long(d0, bswapmask); + // Leading bits + if (shift > 0) { + // Single source word + d1 = d0; + d0 >>= right; + dst++; + n -= bits - dst_idx; + } else { + // 2 source words + d1 = FB_READL(src++); + d1 = fb_rev_pixels_in_long(d1, bswapmask); + + d0 = d0<<left | d1>>right; + dst++; + n -= bits - dst_idx; + } + d0 = fb_rev_pixels_in_long(d0, bswapmask); + FB_WRITEL(comp(d0, FB_READL(dst), first), dst); + d0 = d1; + + // Main chunk + m = n % bits; + n /= bits; + while ((n >= 4) && !bswapmask) { + 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++); + d1 = fb_rev_pixels_in_long(d1, bswapmask); + d0 = d0 << left | d1 >> right; + d0 = fb_rev_pixels_in_long(d0, bswapmask); + FB_WRITEL(d0, dst++); + d0 = d1; + } + + // Trailing bits + if (last) { + if (m <= right) { + // Single source word + d0 <<= left; + } else { + // 2 source words + d1 = FB_READL(src); + d1 = fb_rev_pixels_in_long(d1, + bswapmask); + d0 = d0<<left | d1>>right; + } + d0 = fb_rev_pixels_in_long(d0, bswapmask); + FB_WRITEL(comp(d0, FB_READL(dst), last), dst); + } + } + } +} + + /* + * Generic bitwise copy algorithm, operating backward + */ + +static void +bitcpy_rev(struct fb_info *p, unsigned long __iomem *dst, int dst_idx, + const unsigned long __iomem *src, int src_idx, int bits, + unsigned n, u32 bswapmask) +{ + 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 = fb_shifted_pixels_mask_long(p, bits - 1 - dst_idx, bswapmask); + last = ~fb_shifted_pixels_mask_long(p, bits - 1 - ((dst_idx-n) % bits), + bswapmask); + + 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 + unsigned long d0, d1; + int m; + + int const left = -shift & (bits-1); + int const right = shift & (bits-1); + bswapmask &= shift; + + if ((unsigned long)dst_idx+1 >= n) { + // Single destination word + if (last) + first &= last; + d0 = FB_READL(src); + if (shift < 0) { + // Single source word + d0 <<= left; + } else if (1+(unsigned long)src_idx >= n) { + // Single source word + d0 >>= right; + } else { + // 2 source words + d1 = FB_READL(src - 1); + d1 = fb_rev_pixels_in_long(d1, bswapmask); + d0 = d0>>right | d1<<left; + } + d0 = fb_rev_pixels_in_long(d0, bswapmask); + FB_WRITEL(comp(d0, 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--); + d0 = fb_rev_pixels_in_long(d0, bswapmask); + // Leading bits + if (shift < 0) { + // Single source word + d1 = d0; + d0 <<= left; + } else { + // 2 source words + d1 = FB_READL(src--); + d1 = fb_rev_pixels_in_long(d1, bswapmask); + d0 = d0>>right | d1<<left; + } + d0 = fb_rev_pixels_in_long(d0, bswapmask); + FB_WRITEL(comp(d0, FB_READL(dst), first), dst); + d0 = d1; + dst--; + n -= dst_idx+1; + + // Main chunk + m = n % bits; + n /= bits; + while ((n >= 4) && !bswapmask) { + 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--); + d1 = fb_rev_pixels_in_long(d1, bswapmask); + d0 = d0 >> right | d1 << left; + d0 = fb_rev_pixels_in_long(d0, bswapmask); + FB_WRITEL(d0, dst--); + d0 = d1; + } + + // Trailing bits + if (last) { + if (m <= left) { + // Single source word + d0 >>= right; + } else { + // 2 source words + d1 = FB_READL(src); + d1 = fb_rev_pixels_in_long(d1, + bswapmask); + d0 = d0>>right | d1<<left; + } + d0 = fb_rev_pixels_in_long(d0, bswapmask); + FB_WRITEL(comp(d0, 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; + u32 bswapmask = fb_compute_bswapmask(p); + + if (p->state != FBINFO_STATE_RUNNING) + 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(p, dst, dst_idx, src, src_idx, bits, + width*p->var.bits_per_pixel, bswapmask); + } + } else { + while (height--) { + dst += dst_idx >> (ffs(bits) - 1); + dst_idx &= (bytes - 1); + src += src_idx >> (ffs(bits) - 1); + src_idx &= (bytes - 1); + bitcpy(p, dst, dst_idx, src, src_idx, bits, + width*p->var.bits_per_pixel, bswapmask); + 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"); + |