m68k: Atari fb revival

Update the atari fb to 2.6 by Michael Schmitz,
Reformatting and rewrite of bit plane functions by Roman Zippel,
A few more fixes by Geert Uytterhoeven.

Signed-off-by: Michael Schmitz <schmitz@debian.org>
Signed-off-by: Roman Zippel <zippel@linux-m68k.org>
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 293 insertions, 0 deletions

diff --git a/drivers/video/atafb_iplan2p2.c b/drivers/video/atafb_iplan2p2.c
new file mode 100644
index 000000000000..8cc9c50379d0
--- /dev/null
+++ b/drivers/video/atafb_iplan2p2.c
@@ -0,0 +1,293 @@
+/*
+ *  linux/drivers/video/iplan2p2.c -- Low level frame buffer operations for
+ *                                    interleaved bitplanes à la Atari (2
+ *                                    planes, 2 bytes interleave)
+ *
+ *      Created 5 Apr 1997 by Geert Uytterhoeven
+ *
+ *  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.
+ */
+
+#include <linux/module.h>
+#include <linux/string.h>
+#include <linux/fb.h>
+
+#include <asm/setup.h>
+
+#include "atafb.h"
+
+#define BPL     2
+#include "atafb_utils.h"
+
+void atafb_iplan2p2_copyarea(struct fb_info *info, u_long next_line,
+                             int sy, int sx, int dy, int dx,
+                             int height, int width)
+{
+        /*  bmove() has to distinguish two major cases: If both, source and
+         *  destination, start at even addresses or both are at odd
+         *  addresses, just the first odd and last even column (if present)
+         *  require special treatment (memmove_col()). The rest between
+         *  then can be copied by normal operations, because all adjacent
+         *  bytes are affected and are to be stored in the same order.
+         *    The pathological case is when the move should go from an odd
+         *  address to an even or vice versa. Since the bytes in the plane
+         *  words must be assembled in new order, it seems wisest to make
+         *  all movements by memmove_col().
+         */
+
+        u8 *src, *dst;
+        u32 *s, *d;
+        int w, l , i, j;
+        u_int colsize;
+        u_int upwards = (dy < sy) || (dy == sy && dx < sx);
+
+        colsize = height;
+        if (!((sx ^ dx) & 15)) {
+                /* odd->odd or even->even */
+
+                if (upwards) {
+                        src = (u8 *)info->screen_base + sy * next_line + (sx & ~15) / (8 / BPL);
+                        dst = (u8 *)info->screen_base + dy * next_line + (dx & ~15) / (8 / BPL);
+                        if (sx & 15) {
+                                memmove32_col(dst, src, 0xff00ff, height, next_line - BPL * 2);
+                                src += BPL * 2;
+                                dst += BPL * 2;
+                                width -= 8;
+                        }
+                        w = width >> 4;
+                        if (w) {
+                                s = (u32 *)src;
+                                d = (u32 *)dst;
+                                w *= BPL / 2;
+                                l = next_line - w * 4;
+                                for (j = height; j > 0; j--) {
+                                        for (i = w; i > 0; i--)
+                                                *d++ = *s++;
+                                        s = (u32 *)((u8 *)s + l);
+                                        d = (u32 *)((u8 *)d + l);
+                                }
+                        }
+                        if (width & 15)
+                                memmove32_col(dst + width / (8 / BPL), src + width / (8 / BPL),
+                                              0xff00ff00, height, next_line - BPL * 2);
+                } else {
+                        src = (u8 *)info->screen_base + (sy - 1) * next_line + ((sx + width + 8) & ~15) / (8 / BPL);
+                        dst = (u8 *)info->screen_base + (dy - 1) * next_line + ((dx + width + 8) & ~15) / (8 / BPL);
+
+                        if ((sx + width) & 15) {
+                                src -= BPL * 2;
+                                dst -= BPL * 2;
+                                memmove32_col(dst, src, 0xff00ff00, colsize, -next_line - BPL * 2);
+                                width -= 8;
+                        }
+                        w = width >> 4;
+                        if (w) {
+                                s = (u32 *)src;
+                                d = (u32 *)dst;
+                                w *= BPL / 2;
+                                l = next_line - w * 4;
+                                for (j = height; j > 0; j--) {
+                                        for (i = w; i > 0; i--)
+                                                *--d = *--s;
+                                        s = (u32 *)((u8 *)s - l);
+                                        d = (u32 *)((u8 *)d - l);
+                                }
+                        }
+                        if (sx & 15)
+                                memmove32_col(dst - (width - 16) / (8 / BPL),
+                                              src - (width - 16) / (8 / BPL),
+                                              0xff00ff, colsize, -next_line - BPL * 2);
+                }
+        } else {
+                /* odd->even or even->odd */
+                if (upwards) {
+                        u32 *src32, *dst32;
+                        u32 pval[4], v, v1, mask;
+                        int i, j, w, f;
+
+                        src = (u8 *)info->screen_base + sy * next_line + (sx & ~15) / (8 / BPL);
+                        dst = (u8 *)info->screen_base + dy * next_line + (dx & ~15) / (8 / BPL);
+
+                        mask = 0xff00ff00;
+                        f = 0;
+                        w = width;
+                        if (sx & 15) {
+                                f = 1;
+                                w += 8;
+                        }
+                        if ((sx + width) & 15)
+                                f |= 2;
+                        w >>= 4;
+                        for (i = height; i; i--) {
+                                src32 = (u32 *)src;
+                                dst32 = (u32 *)dst;
+
+                                if (f & 1) {
+                                        pval[0] = (*src32++ << 8) & mask;
+                                } else {
+                                        pval[0] = dst32[0] & mask;
+                                }
+
+                                for (j = w; j > 0; j--) {
+                                        v = *src32++;
+                                        v1 = v & mask;
+                                        *dst32++ = pval[0] | (v1 >> 8);
+                                        pval[0] = (v ^ v1) << 8;
+                                }
+
+                                if (f & 2) {
+                                        dst32[0] = (dst32[0] & mask) | pval[0];
+                                }
+
+                                src += next_line;
+                                dst += next_line;
+                        }
+                } else {
+                        u32 *src32, *dst32;
+                        u32 pval[4], v, v1, mask;
+                        int i, j, w, f;
+
+                        src = (u8 *)info->screen_base + (sy - 1) * next_line + ((sx + width + 8) & ~15) / (8 / BPL);
+                        dst = (u8 *)info->screen_base + (dy - 1) * next_line + ((dx + width + 8) & ~15) / (8 / BPL);
+
+                        mask = 0xff00ff;
+                        f = 0;
+                        w = width;
+                        if ((dx + width) & 15)
+                                f = 1;
+                        if (sx & 15) {
+                                f |= 2;
+                                w += 8;
+                        }
+                        w >>= 4;
+                        for (i = height; i; i--) {
+                                src32 = (u32 *)src;
+                                dst32 = (u32 *)dst;
+
+                                if (f & 1) {
+                                        pval[0] = dst32[-1] & mask;
+                                } else {
+                                        pval[0] = (*--src32 >> 8) & mask;
+                                }
+
+                                for (j = w; j > 0; j--) {
+                                        v = *--src32;
+                                        v1 = v & mask;
+                                        *--dst32 = pval[0] | (v1 << 8);
+                                        pval[0] = (v ^ v1) >> 8;
+                                }
+
+                                if (!(f & 2)) {
+                                        dst32[-1] = (dst32[-1] & mask) | pval[0];
+                                }
+
+                                src -= next_line;
+                                dst -= next_line;
+                        }
+                }
+        }
+}
+
+void atafb_iplan2p2_fillrect(struct fb_info *info, u_long next_line, u32 color,
+                             int sy, int sx, int height, int width)
+{
+        u32 *dest;
+        int rows, i;
+        u32 cval[4];
+
+        dest = (u32 *)(info->screen_base + sy * next_line + (sx & ~15) / (8 / BPL));
+        if (sx & 15) {
+                u8 *dest8 = (u8 *)dest + 1;
+
+                expand8_col2mask(color, cval);
+
+                for (i = height; i; i--) {
+                        fill8_col(dest8, cval);
+                        dest8 += next_line;
+                }
+                dest += BPL / 2;
+                width -= 8;
+        }
+
+        expand16_col2mask(color, cval);
+        rows = width >> 4;
+        if (rows) {
+                u32 *d = dest;
+                u32 off = next_line - rows * BPL * 2;
+                for (i = height; i; i--) {
+                        d = fill16_col(d, rows, cval);
+                        d = (u32 *)((long)d + off);
+                }
+                dest += rows * BPL / 2;
+                width &= 15;
+        }
+
+        if (width) {
+                u8 *dest8 = (u8 *)dest;
+
+                expand8_col2mask(color, cval);
+
+                for (i = height; i; i--) {
+                        fill8_col(dest8, cval);
+                        dest8 += next_line;
+                }
+        }
+}
+
+void atafb_iplan2p2_linefill(struct fb_info *info, u_long next_line,
+                             int dy, int dx, u32 width,
+                             const u8 *data, u32 bgcolor, u32 fgcolor)
+{
+        u32 *dest;
+        const u16 *data16;
+        int rows;
+        u32 fgm[4], bgm[4], m;
+
+        dest = (u32 *)(info->screen_base + dy * next_line + (dx & ~15) / (8 / BPL));
+        if (dx & 15) {
+                fill8_2col((u8 *)dest + 1, fgcolor, bgcolor, *data++);
+                dest += BPL / 2;
+                width -= 8;
+        }
+
+        if (width >= 16) {
+                data16 = (const u16 *)data;
+                expand16_2col2mask(fgcolor, bgcolor, fgm, bgm);
+
+                for (rows = width / 16; rows; rows--) {
+                        u16 d = *data16++;
+                        m = d | ((u32)d << 16);
+                        *dest++ = (m & fgm[0]) ^ bgm[0];
+                }
+
+                data = (const u8 *)data16;
+                width &= 15;
+        }
+
+        if (width)
+                fill8_2col((u8 *)dest, fgcolor, bgcolor, *data);
+}
+
+#ifdef MODULE
+MODULE_LICENSE("GPL");
+
+int init_module(void)
+{
+        return 0;
+}
+
+void cleanup_module(void)
+{
+}
+#endif /* MODULE */
+
+
+    /*
+     *  Visible symbols for modules
+     */
+
+EXPORT_SYMBOL(atafb_iplan2p2_copyarea);
+EXPORT_SYMBOL(atafb_iplan2p2_fillrect);
+EXPORT_SYMBOL(atafb_iplan2p2_linefill);