1/*
2 *  linux/drivers/video/iplan2p4.c -- Low level frame buffer operations for
3 *				      interleaved bitplanes �� 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
23void 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
206void 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
252void 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}
286