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 
31 void 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 
242 void 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 
288 void 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
326 MODULE_LICENSE("GPL");
327 
328 int init_module(void)
329 {
330 	return 0;
331 }
332 
333 void cleanup_module(void)
334 {
335 }
336 #endif /* MODULE */
337 
338 
339     /*
340      *  Visible symbols for modules
341      */
342 
343 EXPORT_SYMBOL(atafb_iplan2p8_copyarea);
344 EXPORT_SYMBOL(atafb_iplan2p8_fillrect);
345 EXPORT_SYMBOL(atafb_iplan2p8_linefill);
346