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Diffstat (limited to 'drivers/video/fbdev/atafb_iplan2p4.c')
-rw-r--r--drivers/video/fbdev/atafb_iplan2p4.c308
1 files changed, 308 insertions, 0 deletions
diff --git a/drivers/video/fbdev/atafb_iplan2p4.c b/drivers/video/fbdev/atafb_iplan2p4.c
new file mode 100644
index 000000000000..bee0d89463f7
--- /dev/null
+++ b/drivers/video/fbdev/atafb_iplan2p4.c
@@ -0,0 +1,308 @@
1/*
2 * linux/drivers/video/iplan2p4.c -- Low level frame buffer operations for
3 * interleaved bitplanes à la Atari (4
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 4
22#include "atafb_utils.h"
23
24void atafb_iplan2p4_copyarea(struct fb_info *info, u_long next_line,
25 int sy, int sx, int dy, int dx,
26 int height, int width)
27{
28 /* bmove() has to distinguish two major cases: If both, source and
29 * destination, start at even addresses or both are at odd
30 * addresses, just the first odd and last even column (if present)
31 * require special treatment (memmove_col()). The rest between
32 * then can be copied by normal operations, because all adjacent
33 * bytes are affected and are to be stored in the same order.
34 * The pathological case is when the move should go from an odd
35 * address to an even or vice versa. Since the bytes in the plane
36 * words must be assembled in new order, it seems wisest to make
37 * all movements by memmove_col().
38 */
39
40 u8 *src, *dst;
41 u32 *s, *d;
42 int w, l , i, j;
43 u_int colsize;
44 u_int upwards = (dy < sy) || (dy == sy && dx < sx);
45
46 colsize = height;
47 if (!((sx ^ dx) & 15)) {
48 /* odd->odd or even->even */
49
50 if (upwards) {
51 src = (u8 *)info->screen_base + sy * next_line + (sx & ~15) / (8 / BPL);
52 dst = (u8 *)info->screen_base + dy * next_line + (dx & ~15) / (8 / BPL);
53 if (sx & 15) {
54 memmove32_col(dst, src, 0xff00ff, height, next_line - BPL * 2);
55 src += BPL * 2;
56 dst += BPL * 2;
57 width -= 8;
58 }
59 w = width >> 4;
60 if (w) {
61 s = (u32 *)src;
62 d = (u32 *)dst;
63 w *= BPL / 2;
64 l = next_line - w * 4;
65 for (j = height; j > 0; j--) {
66 for (i = w; i > 0; i--)
67 *d++ = *s++;
68 s = (u32 *)((u8 *)s + l);
69 d = (u32 *)((u8 *)d + l);
70 }
71 }
72 if (width & 15)
73 memmove32_col(dst + width / (8 / BPL), src + width / (8 / BPL),
74 0xff00ff00, height, next_line - BPL * 2);
75 } else {
76 src = (u8 *)info->screen_base + (sy - 1) * next_line + ((sx + width + 8) & ~15) / (8 / BPL);
77 dst = (u8 *)info->screen_base + (dy - 1) * next_line + ((dx + width + 8) & ~15) / (8 / BPL);
78
79 if ((sx + width) & 15) {
80 src -= BPL * 2;
81 dst -= BPL * 2;
82 memmove32_col(dst, src, 0xff00ff00, colsize, -next_line - BPL * 2);
83 width -= 8;
84 }
85 w = width >> 4;
86 if (w) {
87 s = (u32 *)src;
88 d = (u32 *)dst;
89 w *= BPL / 2;
90 l = next_line - w * 4;
91 for (j = height; j > 0; j--) {
92 for (i = w; i > 0; i--)
93 *--d = *--s;
94 s = (u32 *)((u8 *)s - l);
95 d = (u32 *)((u8 *)d - l);
96 }
97 }
98 if (sx & 15)
99 memmove32_col(dst - (width - 16) / (8 / BPL),
100 src - (width - 16) / (8 / BPL),
101 0xff00ff, colsize, -next_line - BPL * 2);
102 }
103 } else {
104 /* odd->even or even->odd */
105 if (upwards) {
106 u32 *src32, *dst32;
107 u32 pval[4], v, v1, mask;
108 int i, j, w, f;
109
110 src = (u8 *)info->screen_base + sy * next_line + (sx & ~15) / (8 / BPL);
111 dst = (u8 *)info->screen_base + dy * next_line + (dx & ~15) / (8 / BPL);
112
113 mask = 0xff00ff00;
114 f = 0;
115 w = width;
116 if (sx & 15) {
117 f = 1;
118 w += 8;
119 }
120 if ((sx + width) & 15)
121 f |= 2;
122 w >>= 4;
123 for (i = height; i; i--) {
124 src32 = (u32 *)src;
125 dst32 = (u32 *)dst;
126
127 if (f & 1) {
128 pval[0] = (*src32++ << 8) & mask;
129 pval[1] = (*src32++ << 8) & mask;
130 } else {
131 pval[0] = dst32[0] & mask;
132 pval[1] = dst32[1] & mask;
133 }
134
135 for (j = w; j > 0; j--) {
136 v = *src32++;
137 v1 = v & mask;
138 *dst32++ = pval[0] | (v1 >> 8);
139 pval[0] = (v ^ v1) << 8;
140 v = *src32++;
141 v1 = v & mask;
142 *dst32++ = pval[1] | (v1 >> 8);
143 pval[1] = (v ^ v1) << 8;
144 }
145
146 if (f & 2) {
147 dst32[0] = (dst32[0] & mask) | pval[0];
148 dst32[1] = (dst32[1] & mask) | pval[1];
149 }
150
151 src += next_line;
152 dst += next_line;
153 }
154 } else {
155 u32 *src32, *dst32;
156 u32 pval[4], v, v1, mask;
157 int i, j, w, f;
158
159 src = (u8 *)info->screen_base + (sy - 1) * next_line + ((sx + width + 8) & ~15) / (8 / BPL);
160 dst = (u8 *)info->screen_base + (dy - 1) * next_line + ((dx + width + 8) & ~15) / (8 / BPL);
161
162 mask = 0xff00ff;
163 f = 0;
164 w = width;
165 if ((dx + width) & 15)
166 f = 1;
167 if (sx & 15) {
168 f |= 2;
169 w += 8;
170 }
171 w >>= 4;
172 for (i = height; i; i--) {
173 src32 = (u32 *)src;
174 dst32 = (u32 *)dst;
175
176 if (f & 1) {
177 pval[0] = dst32[-1] & mask;
178 pval[1] = dst32[-2] & mask;
179 } else {
180 pval[0] = (*--src32 >> 8) & mask;
181 pval[1] = (*--src32 >> 8) & mask;
182 }
183
184 for (j = w; j > 0; j--) {
185 v = *--src32;
186 v1 = v & mask;
187 *--dst32 = pval[0] | (v1 << 8);
188 pval[0] = (v ^ v1) >> 8;
189 v = *--src32;
190 v1 = v & mask;
191 *--dst32 = pval[1] | (v1 << 8);
192 pval[1] = (v ^ v1) >> 8;
193 }
194
195 if (!(f & 2)) {
196 dst32[-1] = (dst32[-1] & mask) | pval[0];
197 dst32[-2] = (dst32[-2] & mask) | pval[1];
198 }
199
200 src -= next_line;
201 dst -= next_line;
202 }
203 }
204 }
205}
206
207void atafb_iplan2p4_fillrect(struct fb_info *info, u_long next_line, u32 color,
208 int sy, int sx, int height, int width)
209{
210 u32 *dest;
211 int rows, i;
212 u32 cval[4];
213
214 dest = (u32 *)(info->screen_base + sy * next_line + (sx & ~15) / (8 / BPL));
215 if (sx & 15) {
216 u8 *dest8 = (u8 *)dest + 1;
217
218 expand8_col2mask(color, cval);
219
220 for (i = height; i; i--) {
221 fill8_col(dest8, cval);
222 dest8 += next_line;
223 }
224 dest += BPL / 2;
225 width -= 8;
226 }
227
228 expand16_col2mask(color, cval);
229 rows = width >> 4;
230 if (rows) {
231 u32 *d = dest;
232 u32 off = next_line - rows * BPL * 2;
233 for (i = height; i; i--) {
234 d = fill16_col(d, rows, cval);
235 d = (u32 *)((long)d + off);
236 }
237 dest += rows * BPL / 2;
238 width &= 15;
239 }
240
241 if (width) {
242 u8 *dest8 = (u8 *)dest;
243
244 expand8_col2mask(color, cval);
245
246 for (i = height; i; i--) {
247 fill8_col(dest8, cval);
248 dest8 += next_line;
249 }
250 }
251}
252
253void atafb_iplan2p4_linefill(struct fb_info *info, u_long next_line,
254 int dy, int dx, u32 width,
255 const u8 *data, u32 bgcolor, u32 fgcolor)
256{
257 u32 *dest;
258 const u16 *data16;
259 int rows;
260 u32 fgm[4], bgm[4], m;
261
262 dest = (u32 *)(info->screen_base + dy * next_line + (dx & ~15) / (8 / BPL));
263 if (dx & 15) {
264 fill8_2col((u8 *)dest + 1, fgcolor, bgcolor, *data++);
265 dest += BPL / 2;
266 width -= 8;
267 }
268
269 if (width >= 16) {
270 data16 = (const u16 *)data;
271 expand16_2col2mask(fgcolor, bgcolor, fgm, bgm);
272
273 for (rows = width / 16; rows; rows--) {
274 u16 d = *data16++;
275 m = d | ((u32)d << 16);
276 *dest++ = (m & fgm[0]) ^ bgm[0];
277 *dest++ = (m & fgm[1]) ^ bgm[1];
278 }
279
280 data = (const u8 *)data16;
281 width &= 15;
282 }
283
284 if (width)
285 fill8_2col((u8 *)dest, fgcolor, bgcolor, *data);
286}
287
288#ifdef MODULE
289MODULE_LICENSE("GPL");
290
291int init_module(void)
292{
293 return 0;
294}
295
296void cleanup_module(void)
297{
298}
299#endif /* MODULE */
300
301
302 /*
303 * Visible symbols for modules
304 */
305
306EXPORT_SYMBOL(atafb_iplan2p4_copyarea);
307EXPORT_SYMBOL(atafb_iplan2p4_fillrect);
308EXPORT_SYMBOL(atafb_iplan2p4_linefill);
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-20 12:07:53 -0500