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/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	2
22#include "atafb_utils.h"
23
24void atafb_iplan2p2_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				} else {
130					pval[0] = dst32[0] & mask;
131				}
132
133				for (j = w; j > 0; j--) {
134					v = *src32++;
135					v1 = v & mask;
136					*dst32++ = pval[0] | (v1 >> 8);
137					pval[0] = (v ^ v1) << 8;
138				}
139
140				if (f & 2) {
141					dst32[0] = (dst32[0] & mask) | pval[0];
142				}
143
144				src += next_line;
145				dst += next_line;
146			}
147		} else {
148			u32 *src32, *dst32;
149			u32 pval[4], v, v1, mask;
150			int i, j, w, f;
151
152			src = (u8 *)info->screen_base + (sy - 1) * next_line + ((sx + width + 8) & ~15) / (8 / BPL);
153			dst = (u8 *)info->screen_base + (dy - 1) * next_line + ((dx + width + 8) & ~15) / (8 / BPL);
154
155			mask = 0xff00ff;
156			f = 0;
157			w = width;
158			if ((dx + width) & 15)
159				f = 1;
160			if (sx & 15) {
161				f |= 2;
162				w += 8;
163			}
164			w >>= 4;
165			for (i = height; i; i--) {
166				src32 = (u32 *)src;
167				dst32 = (u32 *)dst;
168
169				if (f & 1) {
170					pval[0] = dst32[-1] & mask;
171				} else {
172					pval[0] = (*--src32 >> 8) & mask;
173				}
174
175				for (j = w; j > 0; j--) {
176					v = *--src32;
177					v1 = v & mask;
178					*--dst32 = pval[0] | (v1 << 8);
179					pval[0] = (v ^ v1) >> 8;
180				}
181
182				if (!(f & 2)) {
183					dst32[-1] = (dst32[-1] & mask) | pval[0];
184				}
185
186				src -= next_line;
187				dst -= next_line;
188			}
189		}
190	}
191}
192
193void atafb_iplan2p2_fillrect(struct fb_info *info, u_long next_line, u32 color,
194                             int sy, int sx, int height, int width)
195{
196	u32 *dest;
197	int rows, i;
198	u32 cval[4];
199
200	dest = (u32 *)(info->screen_base + sy * next_line + (sx & ~15) / (8 / BPL));
201	if (sx & 15) {
202		u8 *dest8 = (u8 *)dest + 1;
203
204		expand8_col2mask(color, cval);
205
206		for (i = height; i; i--) {
207			fill8_col(dest8, cval);
208			dest8 += next_line;
209		}
210		dest += BPL / 2;
211		width -= 8;
212	}
213
214	expand16_col2mask(color, cval);
215	rows = width >> 4;
216	if (rows) {
217		u32 *d = dest;
218		u32 off = next_line - rows * BPL * 2;
219		for (i = height; i; i--) {
220			d = fill16_col(d, rows, cval);
221			d = (u32 *)((long)d + off);
222		}
223		dest += rows * BPL / 2;
224		width &= 15;
225	}
226
227	if (width) {
228		u8 *dest8 = (u8 *)dest;
229
230		expand8_col2mask(color, cval);
231
232		for (i = height; i; i--) {
233			fill8_col(dest8, cval);
234			dest8 += next_line;
235		}
236	}
237}
238
239void atafb_iplan2p2_linefill(struct fb_info *info, u_long next_line,
240                             int dy, int dx, u32 width,
241                             const u8 *data, u32 bgcolor, u32 fgcolor)
242{
243	u32 *dest;
244	const u16 *data16;
245	int rows;
246	u32 fgm[4], bgm[4], m;
247
248	dest = (u32 *)(info->screen_base + dy * next_line + (dx & ~15) / (8 / BPL));
249	if (dx & 15) {
250		fill8_2col((u8 *)dest + 1, fgcolor, bgcolor, *data++);
251		dest += BPL / 2;
252		width -= 8;
253	}
254
255	if (width >= 16) {
256		data16 = (const u16 *)data;
257		expand16_2col2mask(fgcolor, bgcolor, fgm, bgm);
258
259		for (rows = width / 16; rows; rows--) {
260			u16 d = *data16++;
261			m = d | ((u32)d << 16);
262			*dest++ = (m & fgm[0]) ^ bgm[0];
263		}
264
265		data = (const u8 *)data16;
266		width &= 15;
267	}
268
269	if (width)
270		fill8_2col((u8 *)dest, fgcolor, bgcolor, *data);
271}
272
273#ifdef MODULE
274MODULE_LICENSE("GPL");
275
276int init_module(void)
277{
278	return 0;
279}
280
281void cleanup_module(void)
282{
283}
284#endif /* MODULE */
285
286
287    /*
288     *  Visible symbols for modules
289     */
290
291EXPORT_SYMBOL(atafb_iplan2p2_copyarea);
292EXPORT_SYMBOL(atafb_iplan2p2_fillrect);
293EXPORT_SYMBOL(atafb_iplan2p2_linefill);
294