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