1 /*
2  *  linux/drivers/video/iplan2p2.c -- Low level frame buffer operations for
3  *				      interleaved bitplanes à la Atari (2
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	2
21 #include "atafb_utils.h"
22 
23 void atafb_iplan2p2_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 				} else {
129 					pval[0] = dst32[0] & mask;
130 				}
131 
132 				for (j = w; j > 0; j--) {
133 					v = *src32++;
134 					v1 = v & mask;
135 					*dst32++ = pval[0] | (v1 >> 8);
136 					pval[0] = (v ^ v1) << 8;
137 				}
138 
139 				if (f & 2) {
140 					dst32[0] = (dst32[0] & mask) | pval[0];
141 				}
142 
143 				src += next_line;
144 				dst += next_line;
145 			}
146 		} else {
147 			u32 *src32, *dst32;
148 			u32 pval[4], v, v1, mask;
149 			int i, j, w, f;
150 
151 			src = (u8 *)info->screen_base + (sy - 1) * next_line + ((sx + width + 8) & ~15) / (8 / BPL);
152 			dst = (u8 *)info->screen_base + (dy - 1) * next_line + ((dx + width + 8) & ~15) / (8 / BPL);
153 
154 			mask = 0xff00ff;
155 			f = 0;
156 			w = width;
157 			if ((dx + width) & 15)
158 				f = 1;
159 			if (sx & 15) {
160 				f |= 2;
161 				w += 8;
162 			}
163 			w >>= 4;
164 			for (i = height; i; i--) {
165 				src32 = (u32 *)src;
166 				dst32 = (u32 *)dst;
167 
168 				if (f & 1) {
169 					pval[0] = dst32[-1] & mask;
170 				} else {
171 					pval[0] = (*--src32 >> 8) & mask;
172 				}
173 
174 				for (j = w; j > 0; j--) {
175 					v = *--src32;
176 					v1 = v & mask;
177 					*--dst32 = pval[0] | (v1 << 8);
178 					pval[0] = (v ^ v1) >> 8;
179 				}
180 
181 				if (!(f & 2)) {
182 					dst32[-1] = (dst32[-1] & mask) | pval[0];
183 				}
184 
185 				src -= next_line;
186 				dst -= next_line;
187 			}
188 		}
189 	}
190 }
191 
192 void atafb_iplan2p2_fillrect(struct fb_info *info, u_long next_line, u32 color,
193                              int sy, int sx, int height, int width)
194 {
195 	u32 *dest;
196 	int rows, i;
197 	u32 cval[4];
198 
199 	dest = (u32 *)(info->screen_base + sy * next_line + (sx & ~15) / (8 / BPL));
200 	if (sx & 15) {
201 		u8 *dest8 = (u8 *)dest + 1;
202 
203 		expand8_col2mask(color, cval);
204 
205 		for (i = height; i; i--) {
206 			fill8_col(dest8, cval);
207 			dest8 += next_line;
208 		}
209 		dest += BPL / 2;
210 		width -= 8;
211 	}
212 
213 	expand16_col2mask(color, cval);
214 	rows = width >> 4;
215 	if (rows) {
216 		u32 *d = dest;
217 		u32 off = next_line - rows * BPL * 2;
218 		for (i = height; i; i--) {
219 			d = fill16_col(d, rows, cval);
220 			d = (u32 *)((long)d + off);
221 		}
222 		dest += rows * BPL / 2;
223 		width &= 15;
224 	}
225 
226 	if (width) {
227 		u8 *dest8 = (u8 *)dest;
228 
229 		expand8_col2mask(color, cval);
230 
231 		for (i = height; i; i--) {
232 			fill8_col(dest8, cval);
233 			dest8 += next_line;
234 		}
235 	}
236 }
237 
238 void atafb_iplan2p2_linefill(struct fb_info *info, u_long next_line,
239                              int dy, int dx, u32 width,
240                              const u8 *data, u32 bgcolor, u32 fgcolor)
241 {
242 	u32 *dest;
243 	const u16 *data16;
244 	int rows;
245 	u32 fgm[4], bgm[4], m;
246 
247 	dest = (u32 *)(info->screen_base + dy * next_line + (dx & ~15) / (8 / BPL));
248 	if (dx & 15) {
249 		fill8_2col((u8 *)dest + 1, fgcolor, bgcolor, *data++);
250 		dest += BPL / 2;
251 		width -= 8;
252 	}
253 
254 	if (width >= 16) {
255 		data16 = (const u16 *)data;
256 		expand16_2col2mask(fgcolor, bgcolor, fgm, bgm);
257 
258 		for (rows = width / 16; rows; rows--) {
259 			u16 d = *data16++;
260 			m = d | ((u32)d << 16);
261 			*dest++ = (m & fgm[0]) ^ bgm[0];
262 		}
263 
264 		data = (const u8 *)data16;
265 		width &= 15;
266 	}
267 
268 	if (width)
269 		fill8_2col((u8 *)dest, fgcolor, bgcolor, *data);
270 }
271