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Diffstat (limited to 'drivers/video/fbdev/atafb_iplan2p8.c')
-rw-r--r--drivers/video/fbdev/atafb_iplan2p8.c345
1 files changed, 345 insertions, 0 deletions
diff --git a/drivers/video/fbdev/atafb_iplan2p8.c b/drivers/video/fbdev/atafb_iplan2p8.c
new file mode 100644
index 000000000000..356fb52ce443
--- /dev/null
+++ b/drivers/video/fbdev/atafb_iplan2p8.c
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1/*
2 * linux/drivers/video/iplan2p8.c -- Low level frame buffer operations for
3 * interleaved bitplanes à la Atari (8
4 * planes, 2 bytes interleave)
5 *
6 * Created 5 Apr 1997 by Geert Uytterhoeven
7 *
8 * This file is subject to the terms and conditions of the GNU General Public
9 * License. See the file COPYING in the main directory of this archive for
10 * more details.
11 */
12
13#include <linux/module.h>
14#include <linux/string.h>
15#include <linux/fb.h>
16
17#include <asm/setup.h>
18
19#include "atafb.h"
20
21#define BPL 8
22#include "atafb_utils.h"
23
24
25/* Copies a 8 plane column from 's', height 'h', to 'd'. */
26
27/* This expands a 8 bit color into two longs for two movepl (8 plane)
28 * operations.
29 */
30
31void atafb_iplan2p8_copyarea(struct fb_info *info, u_long next_line,
32 int sy, int sx, int dy, int dx,
33 int height, int width)
34{
35 /* bmove() has to distinguish two major cases: If both, source and
36 * destination, start at even addresses or both are at odd
37 * addresses, just the first odd and last even column (if present)
38 * require special treatment (memmove_col()). The rest between
39 * then can be copied by normal operations, because all adjacent
40 * bytes are affected and are to be stored in the same order.
41 * The pathological case is when the move should go from an odd
42 * address to an even or vice versa. Since the bytes in the plane
43 * words must be assembled in new order, it seems wisest to make
44 * all movements by memmove_col().
45 */
46
47 u8 *src, *dst;
48 u32 *s, *d;
49 int w, l , i, j;
50 u_int colsize;
51 u_int upwards = (dy < sy) || (dy == sy && dx < sx);
52
53 colsize = height;
54 if (!((sx ^ dx) & 15)) {
55 /* odd->odd or even->even */
56
57 if (upwards) {
58 src = (u8 *)info->screen_base + sy * next_line + (sx & ~15) / (8 / BPL);
59 dst = (u8 *)info->screen_base + dy * next_line + (dx & ~15) / (8 / BPL);
60 if (sx & 15) {
61 memmove32_col(dst, src, 0xff00ff, height, next_line - BPL * 2);
62 src += BPL * 2;
63 dst += BPL * 2;
64 width -= 8;
65 }
66 w = width >> 4;
67 if (w) {
68 s = (u32 *)src;
69 d = (u32 *)dst;
70 w *= BPL / 2;
71 l = next_line - w * 4;
72 for (j = height; j > 0; j--) {
73 for (i = w; i > 0; i--)
74 *d++ = *s++;
75 s = (u32 *)((u8 *)s + l);
76 d = (u32 *)((u8 *)d + l);
77 }
78 }
79 if (width & 15)
80 memmove32_col(dst + width / (8 / BPL), src + width / (8 / BPL),
81 0xff00ff00, height, next_line - BPL * 2);
82 } else {
83 src = (u8 *)info->screen_base + (sy - 1) * next_line + ((sx + width + 8) & ~15) / (8 / BPL);
84 dst = (u8 *)info->screen_base + (dy - 1) * next_line + ((dx + width + 8) & ~15) / (8 / BPL);
85
86 if ((sx + width) & 15) {
87 src -= BPL * 2;
88 dst -= BPL * 2;
89 memmove32_col(dst, src, 0xff00ff00, colsize, -next_line - BPL * 2);
90 width -= 8;
91 }
92 w = width >> 4;
93 if (w) {
94 s = (u32 *)src;
95 d = (u32 *)dst;
96 w *= BPL / 2;
97 l = next_line - w * 4;
98 for (j = height; j > 0; j--) {
99 for (i = w; i > 0; i--)
100 *--d = *--s;
101 s = (u32 *)((u8 *)s - l);
102 d = (u32 *)((u8 *)d - l);
103 }
104 }
105 if (sx & 15)
106 memmove32_col(dst - (width - 16) / (8 / BPL),
107 src - (width - 16) / (8 / BPL),
108 0xff00ff, colsize, -next_line - BPL * 2);
109 }
110 } else {
111 /* odd->even or even->odd */
112 if (upwards) {
113 u32 *src32, *dst32;
114 u32 pval[4], v, v1, mask;
115 int i, j, w, f;
116
117 src = (u8 *)info->screen_base + sy * next_line + (sx & ~15) / (8 / BPL);
118 dst = (u8 *)info->screen_base + dy * next_line + (dx & ~15) / (8 / BPL);
119
120 mask = 0xff00ff00;
121 f = 0;
122 w = width;
123 if (sx & 15) {
124 f = 1;
125 w += 8;
126 }
127 if ((sx + width) & 15)
128 f |= 2;
129 w >>= 4;
130 for (i = height; i; i--) {
131 src32 = (u32 *)src;
132 dst32 = (u32 *)dst;
133
134 if (f & 1) {
135 pval[0] = (*src32++ << 8) & mask;
136 pval[1] = (*src32++ << 8) & mask;
137 pval[2] = (*src32++ << 8) & mask;
138 pval[3] = (*src32++ << 8) & mask;
139 } else {
140 pval[0] = dst32[0] & mask;
141 pval[1] = dst32[1] & mask;
142 pval[2] = dst32[2] & mask;
143 pval[3] = dst32[3] & mask;
144 }
145
146 for (j = w; j > 0; j--) {
147 v = *src32++;
148 v1 = v & mask;
149 *dst32++ = pval[0] | (v1 >> 8);
150 pval[0] = (v ^ v1) << 8;
151 v = *src32++;
152 v1 = v & mask;
153 *dst32++ = pval[1] | (v1 >> 8);
154 pval[1] = (v ^ v1) << 8;
155 v = *src32++;
156 v1 = v & mask;
157 *dst32++ = pval[2] | (v1 >> 8);
158 pval[2] = (v ^ v1) << 8;
159 v = *src32++;
160 v1 = v & mask;
161 *dst32++ = pval[3] | (v1 >> 8);
162 pval[3] = (v ^ v1) << 8;
163 }
164
165 if (f & 2) {
166 dst32[0] = (dst32[0] & mask) | pval[0];
167 dst32[1] = (dst32[1] & mask) | pval[1];
168 dst32[2] = (dst32[2] & mask) | pval[2];
169 dst32[3] = (dst32[3] & mask) | pval[3];
170 }
171
172 src += next_line;
173 dst += next_line;
174 }
175 } else {
176 u32 *src32, *dst32;
177 u32 pval[4], v, v1, mask;
178 int i, j, w, f;
179
180 src = (u8 *)info->screen_base + (sy - 1) * next_line + ((sx + width + 8) & ~15) / (8 / BPL);
181 dst = (u8 *)info->screen_base + (dy - 1) * next_line + ((dx + width + 8) & ~15) / (8 / BPL);
182
183 mask = 0xff00ff;
184 f = 0;
185 w = width;
186 if ((dx + width) & 15)
187 f = 1;
188 if (sx & 15) {
189 f |= 2;
190 w += 8;
191 }
192 w >>= 4;
193 for (i = height; i; i--) {
194 src32 = (u32 *)src;
195 dst32 = (u32 *)dst;
196
197 if (f & 1) {
198 pval[0] = dst32[-1] & mask;
199 pval[1] = dst32[-2] & mask;
200 pval[2] = dst32[-3] & mask;
201 pval[3] = dst32[-4] & mask;
202 } else {
203 pval[0] = (*--src32 >> 8) & mask;
204 pval[1] = (*--src32 >> 8) & mask;
205 pval[2] = (*--src32 >> 8) & mask;
206 pval[3] = (*--src32 >> 8) & mask;
207 }
208
209 for (j = w; j > 0; j--) {
210 v = *--src32;
211 v1 = v & mask;
212 *--dst32 = pval[0] | (v1 << 8);
213 pval[0] = (v ^ v1) >> 8;
214 v = *--src32;
215 v1 = v & mask;
216 *--dst32 = pval[1] | (v1 << 8);
217 pval[1] = (v ^ v1) >> 8;
218 v = *--src32;
219 v1 = v & mask;
220 *--dst32 = pval[2] | (v1 << 8);
221 pval[2] = (v ^ v1) >> 8;
222 v = *--src32;
223 v1 = v & mask;
224 *--dst32 = pval[3] | (v1 << 8);
225 pval[3] = (v ^ v1) >> 8;
226 }
227
228 if (!(f & 2)) {
229 dst32[-1] = (dst32[-1] & mask) | pval[0];
230 dst32[-2] = (dst32[-2] & mask) | pval[1];
231 dst32[-3] = (dst32[-3] & mask) | pval[2];
232 dst32[-4] = (dst32[-4] & mask) | pval[3];
233 }
234
235 src -= next_line;
236 dst -= next_line;
237 }
238 }
239 }
240}
241
242void atafb_iplan2p8_fillrect(struct fb_info *info, u_long next_line, u32 color,
243 int sy, int sx, int height, int width)
244{
245 u32 *dest;
246 int rows, i;
247 u32 cval[4];
248
249 dest = (u32 *)(info->screen_base + sy * next_line + (sx & ~15) / (8 / BPL));
250 if (sx & 15) {
251 u8 *dest8 = (u8 *)dest + 1;
252
253 expand8_col2mask(color, cval);
254
255 for (i = height; i; i--) {
256 fill8_col(dest8, cval);
257 dest8 += next_line;
258 }
259 dest += BPL / 2;
260 width -= 8;
261 }
262
263 expand16_col2mask(color, cval);
264 rows = width >> 4;
265 if (rows) {
266 u32 *d = dest;
267 u32 off = next_line - rows * BPL * 2;
268 for (i = height; i; i--) {
269 d = fill16_col(d, rows, cval);
270 d = (u32 *)((long)d + off);
271 }
272 dest += rows * BPL / 2;
273 width &= 15;
274 }
275
276 if (width) {
277 u8 *dest8 = (u8 *)dest;
278
279 expand8_col2mask(color, cval);
280
281 for (i = height; i; i--) {
282 fill8_col(dest8, cval);
283 dest8 += next_line;
284 }
285 }
286}
287
288void atafb_iplan2p8_linefill(struct fb_info *info, u_long next_line,
289 int dy, int dx, u32 width,
290 const u8 *data, u32 bgcolor, u32 fgcolor)
291{
292 u32 *dest;
293 const u16 *data16;
294 int rows;
295 u32 fgm[4], bgm[4], m;
296
297 dest = (u32 *)(info->screen_base + dy * next_line + (dx & ~15) / (8 / BPL));
298 if (dx & 15) {
299 fill8_2col((u8 *)dest + 1, fgcolor, bgcolor, *data++);
300 dest += BPL / 2;
301 width -= 8;
302 }
303
304 if (width >= 16) {
305 data16 = (const u16 *)data;
306 expand16_2col2mask(fgcolor, bgcolor, fgm, bgm);
307
308 for (rows = width / 16; rows; rows--) {
309 u16 d = *data16++;
310 m = d | ((u32)d << 16);
311 *dest++ = (m & fgm[0]) ^ bgm[0];
312 *dest++ = (m & fgm[1]) ^ bgm[1];
313 *dest++ = (m & fgm[2]) ^ bgm[2];
314 *dest++ = (m & fgm[3]) ^ bgm[3];
315 }
316
317 data = (const u8 *)data16;
318 width &= 15;
319 }
320
321 if (width)
322 fill8_2col((u8 *)dest, fgcolor, bgcolor, *data);
323}
324
325#ifdef MODULE
326MODULE_LICENSE("GPL");
327
328int init_module(void)
329{
330 return 0;
331}
332
333void cleanup_module(void)
334{
335}
336#endif /* MODULE */
337
338
339 /*
340 * Visible symbols for modules
341 */
342
343EXPORT_SYMBOL(atafb_iplan2p8_copyarea);
344EXPORT_SYMBOL(atafb_iplan2p8_fillrect);
345EXPORT_SYMBOL(atafb_iplan2p8_linefill);
generated by cgit v1.2.2 (git 2.25.0) at 2026-01-09 10:50:52 -0500