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);
309