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/string.h>
14 #include <linux/fb.h>
15
16 #include <asm/setup.h>
17
18 #include "atafb.h"
19
20 #define BPL 4
21 #include "atafb_utils.h"
22
23 void atafb_iplan2p4_copyarea(struct fb_info *info, u_long next_line,
24 int sy, int sx, int dy, int dx,
25 int height, int width)
26 {
27 /* bmove() has to distinguish two major cases: If both, source and
28 * destination, start at even addresses or both are at odd
29 * addresses, just the first odd and last even column (if present)
30 * require special treatment (memmove_col()). The rest between
31 * then can be copied by normal operations, because all adjacent
32 * bytes are affected and are to be stored in the same order.
33 * The pathological case is when the move should go from an odd
34 * address to an even or vice versa. Since the bytes in the plane
35 * words must be assembled in new order, it seems wisest to make
36 * all movements by memmove_col().
37 */
38
39 u8 *src, *dst;
40 u32 *s, *d;
41 int w, l , i, j;
42 u_int colsize;
43 u_int upwards = (dy < sy) || (dy == sy && dx < sx);
44
45 colsize = height;
46 if (!((sx ^ dx) & 15)) {
47 /* odd->odd or even->even */
48
49 if (upwards) {
50 src = (u8 *)info->screen_base + sy * next_line + (sx & ~15) / (8 / BPL);
51 dst = (u8 *)info->screen_base + dy * next_line + (dx & ~15) / (8 / BPL);
52 if (sx & 15) {
53 memmove32_col(dst, src, 0xff00ff, height, next_line - BPL * 2);
54 src += BPL * 2;
55 dst += BPL * 2;
56 width -= 8;
57 }
58 w = width >> 4;
59 if (w) {
60 s = (u32 *)src;
61 d = (u32 *)dst;
62 w *= BPL / 2;
63 l = next_line - w * 4;
64 for (j = height; j > 0; j--) {
65 for (i = w; i > 0; i--)
66 *d++ = *s++;
67 s = (u32 *)((u8 *)s + l);
68 d = (u32 *)((u8 *)d + l);
69 }
70 }
71 if (width & 15)
72 memmove32_col(dst + width / (8 / BPL), src + width / (8 / BPL),
73 0xff00ff00, height, next_line - BPL * 2);
74 } else {
75 src = (u8 *)info->screen_base + (sy - 1) * next_line + ((sx + width + 8) & ~15) / (8 / BPL);
76 dst = (u8 *)info->screen_base + (dy - 1) * next_line + ((dx + width + 8) & ~15) / (8 / BPL);
77
78 if ((sx + width) & 15) {
79 src -= BPL * 2;
80 dst -= BPL * 2;
81 memmove32_col(dst, src, 0xff00ff00, colsize, -next_line - BPL * 2);
82 width -= 8;
83 }
84 w = width >> 4;
85 if (w) {
86 s = (u32 *)src;
87 d = (u32 *)dst;
88 w *= BPL / 2;
89 l = next_line - w * 4;
90 for (j = height; j > 0; j--) {
91 for (i = w; i > 0; i--)
92 *--d = *--s;
93 s = (u32 *)((u8 *)s - l);
94 d = (u32 *)((u8 *)d - l);
95 }
96 }
97 if (sx & 15)
98 memmove32_col(dst - (width - 16) / (8 / BPL),
99 src - (width - 16) / (8 / BPL),
100 0xff00ff, colsize, -next_line - BPL * 2);
101 }
102 } else {
103 /* odd->even or even->odd */
104 if (upwards) {
105 u32 *src32, *dst32;
106 u32 pval[4], v, v1, mask;
107 int i, j, w, f;
108
109 src = (u8 *)info->screen_base + sy * next_line + (sx & ~15) / (8 / BPL);
110 dst = (u8 *)info->screen_base + dy * next_line + (dx & ~15) / (8 / BPL);
111
112 mask = 0xff00ff00;
113 f = 0;
114 w = width;
115 if (sx & 15) {
116 f = 1;
117 w += 8;
118 }
119 if ((sx + width) & 15)
120 f |= 2;
121 w >>= 4;
122 for (i = height; i; i--) {
123 src32 = (u32 *)src;
124 dst32 = (u32 *)dst;
125
126 if (f & 1) {
127 pval[0] = (*src32++ << 8) & mask;
128 pval[1] = (*src32++ << 8) & mask;
129 } else {
130 pval[0] = dst32[0] & mask;
131 pval[1] = dst32[1] & mask;
132 }
133
134 for (j = w; j > 0; j--) {
135 v = *src32++;
136 v1 = v & mask;
137 *dst32++ = pval[0] | (v1 >> 8);
138 pval[0] = (v ^ v1) << 8;
139 v = *src32++;
140 v1 = v & mask;
141 *dst32++ = pval[1] | (v1 >> 8);
142 pval[1] = (v ^ v1) << 8;
143 }
144
145 if (f & 2) {
146 dst32[0] = (dst32[0] & mask) | pval[0];
147 dst32[1] = (dst32[1] & mask) | pval[1];
148 }
149
150 src += next_line;
151 dst += next_line;
152 }
153 } else {
154 u32 *src32, *dst32;
155 u32 pval[4], v, v1, mask;
156 int i, j, w, f;
157
158 src = (u8 *)info->screen_base + (sy - 1) * next_line + ((sx + width + 8) & ~15) / (8 / BPL);
159 dst = (u8 *)info->screen_base + (dy - 1) * next_line + ((dx + width + 8) & ~15) / (8 / BPL);
160
161 mask = 0xff00ff;
162 f = 0;
163 w = width;
164 if ((dx + width) & 15)
165 f = 1;
166 if (sx & 15) {
167 f |= 2;
168 w += 8;
169 }
170 w >>= 4;
171 for (i = height; i; i--) {
172 src32 = (u32 *)src;
173 dst32 = (u32 *)dst;
174
175 if (f & 1) {
176 pval[0] = dst32[-1] & mask;
177 pval[1] = dst32[-2] & mask;
178 } else {
179 pval[0] = (*--src32 >> 8) & mask;
180 pval[1] = (*--src32 >> 8) & mask;
181 }
182
183 for (j = w; j > 0; j--) {
184 v = *--src32;
185 v1 = v & mask;
186 *--dst32 = pval[0] | (v1 << 8);
187 pval[0] = (v ^ v1) >> 8;
188 v = *--src32;
189 v1 = v & mask;
190 *--dst32 = pval[1] | (v1 << 8);
191 pval[1] = (v ^ v1) >> 8;
192 }
193
194 if (!(f & 2)) {
195 dst32[-1] = (dst32[-1] & mask) | pval[0];
196 dst32[-2] = (dst32[-2] & mask) | pval[1];
197 }
198
199 src -= next_line;
200 dst -= next_line;
201 }
202 }
203 }
204 }
205
206 void atafb_iplan2p4_fillrect(struct fb_info *info, u_long next_line, u32 color,
207 int sy, int sx, int height, int width)
208 {
209 u32 *dest;
210 int rows, i;
211 u32 cval[4];
212
213 dest = (u32 *)(info->screen_base + sy * next_line + (sx & ~15) / (8 / BPL));
214 if (sx & 15) {
215 u8 *dest8 = (u8 *)dest + 1;
216
217 expand8_col2mask(color, cval);
218
219 for (i = height; i; i--) {
220 fill8_col(dest8, cval);
221 dest8 += next_line;
222 }
223 dest += BPL / 2;
224 width -= 8;
225 }
226
227 expand16_col2mask(color, cval);
228 rows = width >> 4;
229 if (rows) {
230 u32 *d = dest;
231 u32 off = next_line - rows * BPL * 2;
232 for (i = height; i; i--) {
233 d = fill16_col(d, rows, cval);
234 d = (u32 *)((long)d + off);
235 }
236 dest += rows * BPL / 2;
237 width &= 15;
238 }
239
240 if (width) {
241 u8 *dest8 = (u8 *)dest;
242
243 expand8_col2mask(color, cval);
244
245 for (i = height; i; i--) {
246 fill8_col(dest8, cval);
247 dest8 += next_line;
248 }
249 }
250 }
251
252 void atafb_iplan2p4_linefill(struct fb_info *info, u_long next_line,
253 int dy, int dx, u32 width,
254 const u8 *data, u32 bgcolor, u32 fgcolor)
255 {
256 u32 *dest;
257 const u16 *data16;
258 int rows;
259 u32 fgm[4], bgm[4], m;
260
261 dest = (u32 *)(info->screen_base + dy * next_line + (dx & ~15) / (8 / BPL));
262 if (dx & 15) {
263 fill8_2col((u8 *)dest + 1, fgcolor, bgcolor, *data++);
264 dest += BPL / 2;
265 width -= 8;
266 }
267
268 if (width >= 16) {
269 data16 = (const u16 *)data;
270 expand16_2col2mask(fgcolor, bgcolor, fgm, bgm);
271
272 for (rows = width / 16; rows; rows--) {
273 u16 d = *data16++;
274 m = d | ((u32)d << 16);
275 *dest++ = (m & fgm[0]) ^ bgm[0];
276 *dest++ = (m & fgm[1]) ^ bgm[1];
277 }
278
279 data = (const u8 *)data16;
280 width &= 15;
281 }
282
283 if (width)
284 fill8_2col((u8 *)dest, fgcolor, bgcolor, *data);
285 }