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
24void 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
207void 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
253void 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
289MODULE_LICENSE("GPL");
290
291int init_module(void)
292{
293	return 0;
294}
295
296void cleanup_module(void)
297{
298}
299#endif /* MODULE */
300
301
302    /*
303     *  Visible symbols for modules
304     */
305
306EXPORT_SYMBOL(atafb_iplan2p4_copyarea);
307EXPORT_SYMBOL(atafb_iplan2p4_fillrect);
308EXPORT_SYMBOL(atafb_iplan2p4_linefill);
309