i2c: tegra: Add stub runtime power management
[linux-2.6.git] / drivers / video / sysimgblt.c
1 /*
2  *  Generic 1-bit or 8-bit source to 1-32 bit destination expansion
3  *  for frame buffer located in system RAM with packed pixels of any depth.
4  *
5  *  Based almost entirely on cfbimgblt.c
6  *
7  *      Copyright (C)  April 2007 Antonino Daplas <adaplas@pol.net>
8  *
9  *  This file is subject to the terms and conditions of the GNU General Public
10  *  License.  See the file COPYING in the main directory of this archive for
11  *  more details.
12  */
13 #include <linux/module.h>
14 #include <linux/string.h>
15 #include <linux/fb.h>
16 #include <asm/types.h>
17
18 #define DEBUG
19
20 #ifdef DEBUG
21 #define DPRINTK(fmt, args...) printk(KERN_DEBUG "%s: " fmt,__func__,## args)
22 #else
23 #define DPRINTK(fmt, args...)
24 #endif
25
26 static const u32 cfb_tab8_be[] = {
27     0x00000000,0x000000ff,0x0000ff00,0x0000ffff,
28     0x00ff0000,0x00ff00ff,0x00ffff00,0x00ffffff,
29     0xff000000,0xff0000ff,0xff00ff00,0xff00ffff,
30     0xffff0000,0xffff00ff,0xffffff00,0xffffffff
31 };
32
33 static const u32 cfb_tab8_le[] = {
34     0x00000000,0xff000000,0x00ff0000,0xffff0000,
35     0x0000ff00,0xff00ff00,0x00ffff00,0xffffff00,
36     0x000000ff,0xff0000ff,0x00ff00ff,0xffff00ff,
37     0x0000ffff,0xff00ffff,0x00ffffff,0xffffffff
38 };
39
40 static const u32 cfb_tab16_be[] = {
41     0x00000000, 0x0000ffff, 0xffff0000, 0xffffffff
42 };
43
44 static const u32 cfb_tab16_le[] = {
45     0x00000000, 0xffff0000, 0x0000ffff, 0xffffffff
46 };
47
48 static const u32 cfb_tab32[] = {
49         0x00000000, 0xffffffff
50 };
51
52 static void color_imageblit(const struct fb_image *image, struct fb_info *p,
53                             void *dst1, u32 start_index, u32 pitch_index)
54 {
55         /* Draw the penguin */
56         u32 *dst, *dst2;
57         u32 color = 0, val, shift;
58         int i, n, bpp = p->var.bits_per_pixel;
59         u32 null_bits = 32 - bpp;
60         u32 *palette = (u32 *) p->pseudo_palette;
61         const u8 *src = image->data;
62
63         dst2 = dst1;
64         for (i = image->height; i--; ) {
65                 n = image->width;
66                 dst = dst1;
67                 shift = 0;
68                 val = 0;
69
70                 if (start_index) {
71                         u32 start_mask = ~(FB_SHIFT_HIGH(p, ~(u32)0,
72                                                          start_index));
73                         val = *dst & start_mask;
74                         shift = start_index;
75                 }
76                 while (n--) {
77                         if (p->fix.visual == FB_VISUAL_TRUECOLOR ||
78                             p->fix.visual == FB_VISUAL_DIRECTCOLOR )
79                                 color = palette[*src];
80                         else
81                                 color = *src;
82                         color <<= FB_LEFT_POS(p, bpp);
83                         val |= FB_SHIFT_HIGH(p, color, shift);
84                         if (shift >= null_bits) {
85                                 *dst++ = val;
86
87                                 val = (shift == null_bits) ? 0 :
88                                         FB_SHIFT_LOW(p, color, 32 - shift);
89                         }
90                         shift += bpp;
91                         shift &= (32 - 1);
92                         src++;
93                 }
94                 if (shift) {
95                         u32 end_mask = FB_SHIFT_HIGH(p, ~(u32)0, shift);
96
97                         *dst &= end_mask;
98                         *dst |= val;
99                 }
100                 dst1 += p->fix.line_length;
101                 if (pitch_index) {
102                         dst2 += p->fix.line_length;
103                         dst1 = (u8 *)((long)dst2 & ~(sizeof(u32) - 1));
104
105                         start_index += pitch_index;
106                         start_index &= 32 - 1;
107                 }
108         }
109 }
110
111 static void slow_imageblit(const struct fb_image *image, struct fb_info *p,
112                                   void *dst1, u32 fgcolor, u32 bgcolor,
113                                   u32 start_index, u32 pitch_index)
114 {
115         u32 shift, color = 0, bpp = p->var.bits_per_pixel;
116         u32 *dst, *dst2;
117         u32 val, pitch = p->fix.line_length;
118         u32 null_bits = 32 - bpp;
119         u32 spitch = (image->width+7)/8;
120         const u8 *src = image->data, *s;
121         u32 i, j, l;
122
123         dst2 = dst1;
124         fgcolor <<= FB_LEFT_POS(p, bpp);
125         bgcolor <<= FB_LEFT_POS(p, bpp);
126
127         for (i = image->height; i--; ) {
128                 shift = val = 0;
129                 l = 8;
130                 j = image->width;
131                 dst = dst1;
132                 s = src;
133
134                 /* write leading bits */
135                 if (start_index) {
136                         u32 start_mask = ~(FB_SHIFT_HIGH(p, ~(u32)0,
137                                                          start_index));
138                         val = *dst & start_mask;
139                         shift = start_index;
140                 }
141
142                 while (j--) {
143                         l--;
144                         color = (*s & (1 << l)) ? fgcolor : bgcolor;
145                         val |= FB_SHIFT_HIGH(p, color, shift);
146
147                         /* Did the bitshift spill bits to the next long? */
148                         if (shift >= null_bits) {
149                                 *dst++ = val;
150                                 val = (shift == null_bits) ? 0 :
151                                         FB_SHIFT_LOW(p, color, 32 - shift);
152                         }
153                         shift += bpp;
154                         shift &= (32 - 1);
155                         if (!l) { l = 8; s++; };
156                 }
157
158                 /* write trailing bits */
159                 if (shift) {
160                         u32 end_mask = FB_SHIFT_HIGH(p, ~(u32)0, shift);
161
162                         *dst &= end_mask;
163                         *dst |= val;
164                 }
165
166                 dst1 += pitch;
167                 src += spitch;
168                 if (pitch_index) {
169                         dst2 += pitch;
170                         dst1 = (u8 *)((long)dst2 & ~(sizeof(u32) - 1));
171                         start_index += pitch_index;
172                         start_index &= 32 - 1;
173                 }
174
175         }
176 }
177
178 /*
179  * fast_imageblit - optimized monochrome color expansion
180  *
181  * Only if:  bits_per_pixel == 8, 16, or 32
182  *           image->width is divisible by pixel/dword (ppw);
183  *           fix->line_legth is divisible by 4;
184  *           beginning and end of a scanline is dword aligned
185  */
186 static void fast_imageblit(const struct fb_image *image, struct fb_info *p,
187                                   void *dst1, u32 fgcolor, u32 bgcolor)
188 {
189         u32 fgx = fgcolor, bgx = bgcolor, bpp = p->var.bits_per_pixel;
190         u32 ppw = 32/bpp, spitch = (image->width + 7)/8;
191         u32 bit_mask, end_mask, eorx, shift;
192         const char *s = image->data, *src;
193         u32 *dst;
194         const u32 *tab = NULL;
195         int i, j, k;
196
197         switch (bpp) {
198         case 8:
199                 tab = fb_be_math(p) ? cfb_tab8_be : cfb_tab8_le;
200                 break;
201         case 16:
202                 tab = fb_be_math(p) ? cfb_tab16_be : cfb_tab16_le;
203                 break;
204         case 32:
205         default:
206                 tab = cfb_tab32;
207                 break;
208         }
209
210         for (i = ppw-1; i--; ) {
211                 fgx <<= bpp;
212                 bgx <<= bpp;
213                 fgx |= fgcolor;
214                 bgx |= bgcolor;
215         }
216
217         bit_mask = (1 << ppw) - 1;
218         eorx = fgx ^ bgx;
219         k = image->width/ppw;
220
221         for (i = image->height; i--; ) {
222                 dst = dst1;
223                 shift = 8;
224                 src = s;
225
226                 for (j = k; j--; ) {
227                         shift -= ppw;
228                         end_mask = tab[(*src >> shift) & bit_mask];
229                         *dst++ = (end_mask & eorx) ^ bgx;
230                         if (!shift) {
231                                 shift = 8;
232                                 src++;
233                         }
234                 }
235                 dst1 += p->fix.line_length;
236                 s += spitch;
237         }
238 }
239
240 void sys_imageblit(struct fb_info *p, const struct fb_image *image)
241 {
242         u32 fgcolor, bgcolor, start_index, bitstart, pitch_index = 0;
243         u32 bpl = sizeof(u32), bpp = p->var.bits_per_pixel;
244         u32 width = image->width;
245         u32 dx = image->dx, dy = image->dy;
246         void *dst1;
247
248         if (p->state != FBINFO_STATE_RUNNING)
249                 return;
250
251         bitstart = (dy * p->fix.line_length * 8) + (dx * bpp);
252         start_index = bitstart & (32 - 1);
253         pitch_index = (p->fix.line_length & (bpl - 1)) * 8;
254
255         bitstart /= 8;
256         bitstart &= ~(bpl - 1);
257         dst1 = (void __force *)p->screen_base + bitstart;
258
259         if (p->fbops->fb_sync)
260                 p->fbops->fb_sync(p);
261
262         if (image->depth == 1) {
263                 if (p->fix.visual == FB_VISUAL_TRUECOLOR ||
264                     p->fix.visual == FB_VISUAL_DIRECTCOLOR) {
265                         fgcolor = ((u32*)(p->pseudo_palette))[image->fg_color];
266                         bgcolor = ((u32*)(p->pseudo_palette))[image->bg_color];
267                 } else {
268                         fgcolor = image->fg_color;
269                         bgcolor = image->bg_color;
270                 }
271
272                 if (32 % bpp == 0 && !start_index && !pitch_index &&
273                     ((width & (32/bpp-1)) == 0) &&
274                     bpp >= 8 && bpp <= 32)
275                         fast_imageblit(image, p, dst1, fgcolor, bgcolor);
276                 else
277                         slow_imageblit(image, p, dst1, fgcolor, bgcolor,
278                                         start_index, pitch_index);
279         } else
280                 color_imageblit(image, p, dst1, start_index, pitch_index);
281 }
282
283 EXPORT_SYMBOL(sys_imageblit);
284
285 MODULE_AUTHOR("Antonino Daplas <adaplas@pol.net>");
286 MODULE_DESCRIPTION("1-bit/8-bit to 1-32 bit color expansion (sys-to-sys)");
287 MODULE_LICENSE("GPL");
288