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-rw-r--r--drivers/video/atafb_iplan2p4.c308
1 files changed, 308 insertions, 0 deletions
diff --git a/drivers/video/atafb_iplan2p4.c b/drivers/video/atafb_iplan2p4.c
new file mode 100644
index 000000000000..bee0d89463f7
--- /dev/null
+++ b/drivers/video/atafb_iplan2p4.c
@@ -0,0 +1,308 @@
+/*
+ * linux/drivers/video/iplan2p4.c -- Low level frame buffer operations for
+ * interleaved bitplanes à la Atari (4
+ * 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 4
+#include "atafb_utils.h"
+
+void atafb_iplan2p4_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;
+ pval[1] = (*src32++ << 8) & mask;
+ } else {
+ pval[0] = dst32[0] & mask;
+ pval[1] = dst32[1] & mask;
+ }
+
+ for (j = w; j > 0; j--) {
+ v = *src32++;
+ v1 = v & mask;
+ *dst32++ = pval[0] | (v1 >> 8);
+ pval[0] = (v ^ v1) << 8;
+ v = *src32++;
+ v1 = v & mask;
+ *dst32++ = pval[1] | (v1 >> 8);
+ pval[1] = (v ^ v1) << 8;
+ }
+
+ if (f & 2) {
+ dst32[0] = (dst32[0] & mask) | pval[0];
+ dst32[1] = (dst32[1] & mask) | pval[1];
+ }
+
+ 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;
+ pval[1] = dst32[-2] & mask;
+ } else {
+ pval[0] = (*--src32 >> 8) & mask;
+ pval[1] = (*--src32 >> 8) & mask;
+ }
+
+ for (j = w; j > 0; j--) {
+ v = *--src32;
+ v1 = v & mask;
+ *--dst32 = pval[0] | (v1 << 8);
+ pval[0] = (v ^ v1) >> 8;
+ v = *--src32;
+ v1 = v & mask;
+ *--dst32 = pval[1] | (v1 << 8);
+ pval[1] = (v ^ v1) >> 8;
+ }
+
+ if (!(f & 2)) {
+ dst32[-1] = (dst32[-1] & mask) | pval[0];
+ dst32[-2] = (dst32[-2] & mask) | pval[1];
+ }
+
+ src -= next_line;
+ dst -= next_line;
+ }
+ }
+ }
+}
+
+void atafb_iplan2p4_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_iplan2p4_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];
+ *dest++ = (m & fgm[1]) ^ bgm[1];
+ }
+
+ 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_iplan2p4_copyarea);
+EXPORT_SYMBOL(atafb_iplan2p4_fillrect);
+EXPORT_SYMBOL(atafb_iplan2p4_linefill);
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.