Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/shaggy...
[linux-2.6] / drivers / video / atafb_iplan2p4.c
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
24 void 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
207 void 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
253 void 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
289 MODULE_LICENSE("GPL");
290
291 int init_module(void)
292 {
293         return 0;
294 }
295
296 void cleanup_module(void)
297 {
298 }
299 #endif /* MODULE */
300
301
302     /*
303      *  Visible symbols for modules
304      */
305
306 EXPORT_SYMBOL(atafb_iplan2p4_copyarea);
307 EXPORT_SYMBOL(atafb_iplan2p4_fillrect);
308 EXPORT_SYMBOL(atafb_iplan2p4_linefill);