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[linux-2.6] / drivers / video / cfbfillrect.c
1 /*
2  *  Generic fillrect for frame buffers with packed pixels of any depth.
3  *
4  *      Copyright (C)  2000 James Simmons (jsimmons@linux-fbdev.org)
5  *
6  *  This file is subject to the terms and conditions of the GNU General Public
7  *  License.  See the file COPYING in the main directory of this archive for
8  *  more details.
9  *
10  * NOTES:
11  *
12  *  The code for depths like 24 that don't have integer number of pixels per
13  *  long is broken and needs to be fixed. For now I turned these types of
14  *  mode off.
15  *
16  *  Also need to add code to deal with cards endians that are different than
17  *  the native cpu endians. I also need to deal with MSB position in the word.
18  *
19  */
20 #include <linux/config.h>
21 #include <linux/module.h>
22 #include <linux/string.h>
23 #include <linux/fb.h>
24 #include <asm/types.h>
25
26 #if BITS_PER_LONG == 32
27 #  define FB_WRITEL fb_writel
28 #  define FB_READL  fb_readl
29 #else
30 #  define FB_WRITEL fb_writeq
31 #  define FB_READL  fb_readq
32 #endif
33
34     /*
35      *  Compose two values, using a bitmask as decision value
36      *  This is equivalent to (a & mask) | (b & ~mask)
37      */
38
39 static inline unsigned long
40 comp(unsigned long a, unsigned long b, unsigned long mask)
41 {
42     return ((a ^ b) & mask) ^ b;
43 }
44
45     /*
46      *  Create a pattern with the given pixel's color
47      */
48
49 #if BITS_PER_LONG == 64
50 static inline unsigned long
51 pixel_to_pat( u32 bpp, u32 pixel)
52 {
53         switch (bpp) {
54         case 1:
55                 return 0xfffffffffffffffful*pixel;
56         case 2:
57                 return 0x5555555555555555ul*pixel;
58         case 4:
59                 return 0x1111111111111111ul*pixel;
60         case 8:
61                 return 0x0101010101010101ul*pixel;
62         case 12:
63                 return 0x0001001001001001ul*pixel;
64         case 16:
65                 return 0x0001000100010001ul*pixel;
66         case 24:
67                 return 0x0000000001000001ul*pixel;
68         case 32:
69                 return 0x0000000100000001ul*pixel;
70         default:
71                 panic("pixel_to_pat(): unsupported pixelformat\n");
72     }
73 }
74 #else
75 static inline unsigned long
76 pixel_to_pat( u32 bpp, u32 pixel)
77 {
78         switch (bpp) {
79         case 1:
80                 return 0xfffffffful*pixel;
81         case 2:
82                 return 0x55555555ul*pixel;
83         case 4:
84                 return 0x11111111ul*pixel;
85         case 8:
86                 return 0x01010101ul*pixel;
87         case 12:
88                 return 0x00001001ul*pixel;
89         case 16:
90                 return 0x00010001ul*pixel;
91         case 24:
92                 return 0x00000001ul*pixel;
93         case 32:
94                 return 0x00000001ul*pixel;
95         default:
96                 panic("pixel_to_pat(): unsupported pixelformat\n");
97     }
98 }
99 #endif
100
101     /*
102      *  Aligned pattern fill using 32/64-bit memory accesses
103      */
104
105 static void
106 bitfill_aligned(unsigned long __iomem *dst, int dst_idx, unsigned long pat, unsigned n, int bits)
107 {
108         unsigned long first, last;
109
110         if (!n)
111                 return;
112
113         first = FB_SHIFT_HIGH(~0UL, dst_idx);
114         last = ~(FB_SHIFT_HIGH(~0UL, (dst_idx+n) % bits));
115
116         if (dst_idx+n <= bits) {
117                 // Single word
118                 if (last)
119                         first &= last;
120                 FB_WRITEL(comp(pat, FB_READL(dst), first), dst);
121         } else {
122                 // Multiple destination words
123
124                 // Leading bits
125                 if (first!= ~0UL) {
126                         FB_WRITEL(comp(pat, FB_READL(dst), first), dst);
127                         dst++;
128                         n -= bits - dst_idx;
129                 }
130
131                 // Main chunk
132                 n /= bits;
133                 while (n >= 8) {
134                         FB_WRITEL(pat, dst++);
135                         FB_WRITEL(pat, dst++);
136                         FB_WRITEL(pat, dst++);
137                         FB_WRITEL(pat, dst++);
138                         FB_WRITEL(pat, dst++);
139                         FB_WRITEL(pat, dst++);
140                         FB_WRITEL(pat, dst++);
141                         FB_WRITEL(pat, dst++);
142                         n -= 8;
143                 }
144                 while (n--)
145                         FB_WRITEL(pat, dst++);
146
147                 // Trailing bits
148                 if (last)
149                         FB_WRITEL(comp(pat, FB_READL(dst), last), dst);
150         }
151 }
152
153
154     /*
155      *  Unaligned generic pattern fill using 32/64-bit memory accesses
156      *  The pattern must have been expanded to a full 32/64-bit value
157      *  Left/right are the appropriate shifts to convert to the pattern to be
158      *  used for the next 32/64-bit word
159      */
160
161 static void
162 bitfill_unaligned(unsigned long __iomem *dst, int dst_idx, unsigned long pat,
163                         int left, int right, unsigned n, int bits)
164 {
165         unsigned long first, last;
166
167         if (!n)
168                 return;
169
170         first = FB_SHIFT_HIGH(~0UL, dst_idx);
171         last = ~(FB_SHIFT_HIGH(~0UL, (dst_idx+n) % bits));
172
173         if (dst_idx+n <= bits) {
174                 // Single word
175                 if (last)
176                         first &= last;
177                 FB_WRITEL(comp(pat, FB_READL(dst), first), dst);
178         } else {
179                 // Multiple destination words
180                 // Leading bits
181                 if (first) {
182                         FB_WRITEL(comp(pat, FB_READL(dst), first), dst);
183                         dst++;
184                         pat = pat << left | pat >> right;
185                         n -= bits - dst_idx;
186                 }
187
188                 // Main chunk
189                 n /= bits;
190                 while (n >= 4) {
191                         FB_WRITEL(pat, dst++);
192                         pat = pat << left | pat >> right;
193                         FB_WRITEL(pat, dst++);
194                         pat = pat << left | pat >> right;
195                         FB_WRITEL(pat, dst++);
196                         pat = pat << left | pat >> right;
197                         FB_WRITEL(pat, dst++);
198                         pat = pat << left | pat >> right;
199                         n -= 4;
200                 }
201                 while (n--) {
202                         FB_WRITEL(pat, dst++);
203                         pat = pat << left | pat >> right;
204                 }
205
206                 // Trailing bits
207                 if (last)
208                         FB_WRITEL(comp(pat, FB_READL(dst), first), dst);
209         }
210 }
211
212     /*
213      *  Aligned pattern invert using 32/64-bit memory accesses
214      */
215 static void
216 bitfill_aligned_rev(unsigned long __iomem *dst, int dst_idx, unsigned long pat, unsigned n, int bits)
217 {
218         unsigned long val = pat, dat;
219         unsigned long first, last;
220
221         if (!n)
222                 return;
223
224         first = FB_SHIFT_HIGH(~0UL, dst_idx);
225         last = ~(FB_SHIFT_HIGH(~0UL, (dst_idx+n) % bits));
226
227         if (dst_idx+n <= bits) {
228                 // Single word
229                 if (last)
230                         first &= last;
231                 dat = FB_READL(dst);
232                 FB_WRITEL(comp(dat ^ val, dat, first), dst);
233         } else {
234                 // Multiple destination words
235                 // Leading bits
236                 if (first!=0UL) {
237                         dat = FB_READL(dst);
238                         FB_WRITEL(comp(dat ^ val, dat, first), dst);
239                         dst++;
240                         n -= bits - dst_idx;
241                 }
242
243                 // Main chunk
244                 n /= bits;
245                 while (n >= 8) {
246                         FB_WRITEL(FB_READL(dst) ^ val, dst);
247                         dst++;
248                         FB_WRITEL(FB_READL(dst) ^ val, dst);
249                         dst++;
250                         FB_WRITEL(FB_READL(dst) ^ val, dst);
251                         dst++;
252                         FB_WRITEL(FB_READL(dst) ^ val, dst);
253                         dst++;
254                         FB_WRITEL(FB_READL(dst) ^ val, dst);
255                         dst++;
256                         FB_WRITEL(FB_READL(dst) ^ val, dst);
257                         dst++;
258                         FB_WRITEL(FB_READL(dst) ^ val, dst);
259                         dst++;
260                         FB_WRITEL(FB_READL(dst) ^ val, dst);
261                         dst++;
262                         n -= 8;
263                 }
264                 while (n--) {
265                         FB_WRITEL(FB_READL(dst) ^ val, dst);
266                         dst++;
267                 }
268                 // Trailing bits
269                 if (last) {
270                         dat = FB_READL(dst);
271                         FB_WRITEL(comp(dat ^ val, dat, last), dst);
272                 }
273         }
274 }
275
276
277     /*
278      *  Unaligned generic pattern invert using 32/64-bit memory accesses
279      *  The pattern must have been expanded to a full 32/64-bit value
280      *  Left/right are the appropriate shifts to convert to the pattern to be
281      *  used for the next 32/64-bit word
282      */
283
284 static void
285 bitfill_unaligned_rev(unsigned long __iomem *dst, int dst_idx, unsigned long pat,
286                         int left, int right, unsigned n, int bits)
287 {
288         unsigned long first, last, dat;
289
290         if (!n)
291                 return;
292
293         first = FB_SHIFT_HIGH(~0UL, dst_idx);
294         last = ~(FB_SHIFT_HIGH(~0UL, (dst_idx+n) % bits));
295
296         if (dst_idx+n <= bits) {
297                 // Single word
298                 if (last)
299                         first &= last;
300                 dat = FB_READL(dst);
301                 FB_WRITEL(comp(dat ^ pat, dat, first), dst);
302         } else {
303                 // Multiple destination words
304
305                 // Leading bits
306                 if (first != 0UL) {
307                         dat = FB_READL(dst);
308                         FB_WRITEL(comp(dat ^ pat, dat, first), dst);
309                         dst++;
310                         pat = pat << left | pat >> right;
311                         n -= bits - dst_idx;
312                 }
313
314                 // Main chunk
315                 n /= bits;
316                 while (n >= 4) {
317                         FB_WRITEL(FB_READL(dst) ^ pat, dst);
318                         dst++;
319                         pat = pat << left | pat >> right;
320                         FB_WRITEL(FB_READL(dst) ^ pat, dst);
321                         dst++;
322                         pat = pat << left | pat >> right;
323                         FB_WRITEL(FB_READL(dst) ^ pat, dst);
324                         dst++;
325                         pat = pat << left | pat >> right;
326                         FB_WRITEL(FB_READL(dst) ^ pat, dst);
327                         dst++;
328                         pat = pat << left | pat >> right;
329                         n -= 4;
330                 }
331                 while (n--) {
332                         FB_WRITEL(FB_READL(dst) ^ pat, dst);
333                         dst++;
334                         pat = pat << left | pat >> right;
335                 }
336
337                 // Trailing bits
338                 if (last) {
339                         dat = FB_READL(dst);
340                         FB_WRITEL(comp(dat ^ pat, dat, last), dst);
341                 }
342         }
343 }
344
345 void cfb_fillrect(struct fb_info *p, const struct fb_fillrect *rect)
346 {
347         unsigned long pat, fg;
348         unsigned long width = rect->width, height = rect->height;
349         int bits = BITS_PER_LONG, bytes = bits >> 3;
350         u32 bpp = p->var.bits_per_pixel;
351         unsigned long __iomem *dst;
352         int dst_idx, left;
353
354         if (p->state != FBINFO_STATE_RUNNING)
355                 return;
356
357         if (p->fix.visual == FB_VISUAL_TRUECOLOR ||
358             p->fix.visual == FB_VISUAL_DIRECTCOLOR )
359                 fg = ((u32 *) (p->pseudo_palette))[rect->color];
360         else
361                 fg = rect->color;
362
363         pat = pixel_to_pat( bpp, fg);
364
365         dst = (unsigned long __iomem *)((unsigned long)p->screen_base & ~(bytes-1));
366         dst_idx = ((unsigned long)p->screen_base & (bytes - 1))*8;
367         dst_idx += rect->dy*p->fix.line_length*8+rect->dx*bpp;
368         /* FIXME For now we support 1-32 bpp only */
369         left = bits % bpp;
370         if (p->fbops->fb_sync)
371                 p->fbops->fb_sync(p);
372         if (!left) {
373                 void (*fill_op32)(unsigned long __iomem *dst, int dst_idx,
374                                   unsigned long pat, unsigned n, int bits) = NULL;
375
376                 switch (rect->rop) {
377                 case ROP_XOR:
378                         fill_op32 = bitfill_aligned_rev;
379                         break;
380                 case ROP_COPY:
381                         fill_op32 = bitfill_aligned;
382                         break;
383                 default:
384                         printk( KERN_ERR "cfb_fillrect(): unknown rop, defaulting to ROP_COPY\n");
385                         fill_op32 = bitfill_aligned;
386                         break;
387                 }
388                 while (height--) {
389                         dst += dst_idx >> (ffs(bits) - 1);
390                         dst_idx &= (bits - 1);
391                         fill_op32(dst, dst_idx, pat, width*bpp, bits);
392                         dst_idx += p->fix.line_length*8;
393                 }
394         } else {
395                 int right;
396                 int r;
397                 int rot = (left-dst_idx) % bpp;
398                 void (*fill_op)(unsigned long __iomem *dst, int dst_idx,
399                                 unsigned long pat, int left, int right,
400                                 unsigned n, int bits) = NULL;
401
402                 /* rotate pattern to correct start position */
403                 pat = pat << rot | pat >> (bpp-rot);
404
405                 right = bpp-left;
406                 switch (rect->rop) {
407                 case ROP_XOR:
408                         fill_op = bitfill_unaligned_rev;
409                         break;
410                 case ROP_COPY:
411                         fill_op = bitfill_unaligned;
412                         break;
413                 default:
414                         printk( KERN_ERR "cfb_fillrect(): unknown rop, defaulting to ROP_COPY\n");
415                         fill_op = bitfill_unaligned;
416                         break;
417                 }
418                 while (height--) {
419                         dst += dst_idx >> (ffs(bits) - 1);
420                         dst_idx &= (bits - 1);
421                         fill_op(dst, dst_idx, pat, left, right,
422                                 width*bpp, bits);
423                         r = (p->fix.line_length*8) % bpp;
424                         pat = pat << (bpp-r) | pat >> r;
425                         dst_idx += p->fix.line_length*8;
426                 }
427         }
428 }
429
430 EXPORT_SYMBOL(cfb_fillrect);
431
432 MODULE_AUTHOR("James Simmons <jsimmons@users.sf.net>");
433 MODULE_DESCRIPTION("Generic software accelerated fill rectangle");
434 MODULE_LICENSE("GPL");