USB: ehci-dbg: fix reading less content of periodic file
[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/module.h>
21 #include <linux/string.h>
22 #include <linux/fb.h>
23 #include <asm/types.h>
24 #include "fb_draw.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      *  Aligned pattern fill using 32/64-bit memory accesses
36      */
37
38 static void
39 bitfill_aligned(struct fb_info *p, unsigned long __iomem *dst, int dst_idx,
40                 unsigned long pat, unsigned n, int bits, u32 bswapmask)
41 {
42         unsigned long first, last;
43
44         if (!n)
45                 return;
46
47         first = fb_shifted_pixels_mask_long(p, dst_idx, bswapmask);
48         last = ~fb_shifted_pixels_mask_long(p, (dst_idx+n) % bits, bswapmask);
49
50         if (dst_idx+n <= bits) {
51                 // Single word
52                 if (last)
53                         first &= last;
54                 FB_WRITEL(comp(pat, FB_READL(dst), first), dst);
55         } else {
56                 // Multiple destination words
57
58                 // Leading bits
59                 if (first!= ~0UL) {
60                         FB_WRITEL(comp(pat, FB_READL(dst), first), dst);
61                         dst++;
62                         n -= bits - dst_idx;
63                 }
64
65                 // Main chunk
66                 n /= bits;
67                 while (n >= 8) {
68                         FB_WRITEL(pat, dst++);
69                         FB_WRITEL(pat, dst++);
70                         FB_WRITEL(pat, dst++);
71                         FB_WRITEL(pat, dst++);
72                         FB_WRITEL(pat, dst++);
73                         FB_WRITEL(pat, dst++);
74                         FB_WRITEL(pat, dst++);
75                         FB_WRITEL(pat, dst++);
76                         n -= 8;
77                 }
78                 while (n--)
79                         FB_WRITEL(pat, dst++);
80
81                 // Trailing bits
82                 if (last)
83                         FB_WRITEL(comp(pat, FB_READL(dst), last), dst);
84         }
85 }
86
87
88     /*
89      *  Unaligned generic pattern fill using 32/64-bit memory accesses
90      *  The pattern must have been expanded to a full 32/64-bit value
91      *  Left/right are the appropriate shifts to convert to the pattern to be
92      *  used for the next 32/64-bit word
93      */
94
95 static void
96 bitfill_unaligned(struct fb_info *p, unsigned long __iomem *dst, int dst_idx,
97                   unsigned long pat, int left, int right, unsigned n, int bits)
98 {
99         unsigned long first, last;
100
101         if (!n)
102                 return;
103
104         first = FB_SHIFT_HIGH(p, ~0UL, dst_idx);
105         last = ~(FB_SHIFT_HIGH(p, ~0UL, (dst_idx+n) % bits));
106
107         if (dst_idx+n <= bits) {
108                 // Single word
109                 if (last)
110                         first &= last;
111                 FB_WRITEL(comp(pat, FB_READL(dst), first), dst);
112         } else {
113                 // Multiple destination words
114                 // Leading bits
115                 if (first) {
116                         FB_WRITEL(comp(pat, FB_READL(dst), first), dst);
117                         dst++;
118                         pat = pat << left | pat >> right;
119                         n -= bits - dst_idx;
120                 }
121
122                 // Main chunk
123                 n /= bits;
124                 while (n >= 4) {
125                         FB_WRITEL(pat, dst++);
126                         pat = pat << left | pat >> right;
127                         FB_WRITEL(pat, dst++);
128                         pat = pat << left | pat >> right;
129                         FB_WRITEL(pat, dst++);
130                         pat = pat << left | pat >> right;
131                         FB_WRITEL(pat, dst++);
132                         pat = pat << left | pat >> right;
133                         n -= 4;
134                 }
135                 while (n--) {
136                         FB_WRITEL(pat, dst++);
137                         pat = pat << left | pat >> right;
138                 }
139
140                 // Trailing bits
141                 if (last)
142                         FB_WRITEL(comp(pat, FB_READL(dst), first), dst);
143         }
144 }
145
146     /*
147      *  Aligned pattern invert using 32/64-bit memory accesses
148      */
149 static void
150 bitfill_aligned_rev(struct fb_info *p, unsigned long __iomem *dst,
151                     int dst_idx, unsigned long pat, unsigned n, int bits,
152                     u32 bswapmask)
153 {
154         unsigned long val = pat, dat;
155         unsigned long first, last;
156
157         if (!n)
158                 return;
159
160         first = fb_shifted_pixels_mask_long(p, dst_idx, bswapmask);
161         last = ~fb_shifted_pixels_mask_long(p, (dst_idx+n) % bits, bswapmask);
162
163         if (dst_idx+n <= bits) {
164                 // Single word
165                 if (last)
166                         first &= last;
167                 dat = FB_READL(dst);
168                 FB_WRITEL(comp(dat ^ val, dat, first), dst);
169         } else {
170                 // Multiple destination words
171                 // Leading bits
172                 if (first!=0UL) {
173                         dat = FB_READL(dst);
174                         FB_WRITEL(comp(dat ^ val, dat, first), dst);
175                         dst++;
176                         n -= bits - dst_idx;
177                 }
178
179                 // Main chunk
180                 n /= bits;
181                 while (n >= 8) {
182                         FB_WRITEL(FB_READL(dst) ^ val, dst);
183                         dst++;
184                         FB_WRITEL(FB_READL(dst) ^ val, dst);
185                         dst++;
186                         FB_WRITEL(FB_READL(dst) ^ val, dst);
187                         dst++;
188                         FB_WRITEL(FB_READL(dst) ^ val, dst);
189                         dst++;
190                         FB_WRITEL(FB_READL(dst) ^ val, dst);
191                         dst++;
192                         FB_WRITEL(FB_READL(dst) ^ val, dst);
193                         dst++;
194                         FB_WRITEL(FB_READL(dst) ^ val, dst);
195                         dst++;
196                         FB_WRITEL(FB_READL(dst) ^ val, dst);
197                         dst++;
198                         n -= 8;
199                 }
200                 while (n--) {
201                         FB_WRITEL(FB_READL(dst) ^ val, dst);
202                         dst++;
203                 }
204                 // Trailing bits
205                 if (last) {
206                         dat = FB_READL(dst);
207                         FB_WRITEL(comp(dat ^ val, dat, last), dst);
208                 }
209         }
210 }
211
212
213     /*
214      *  Unaligned generic pattern invert using 32/64-bit memory accesses
215      *  The pattern must have been expanded to a full 32/64-bit value
216      *  Left/right are the appropriate shifts to convert to the pattern to be
217      *  used for the next 32/64-bit word
218      */
219
220 static void
221 bitfill_unaligned_rev(struct fb_info *p, unsigned long __iomem *dst,
222                       int dst_idx, unsigned long pat, int left, int right,
223                       unsigned n, int bits)
224 {
225         unsigned long first, last, dat;
226
227         if (!n)
228                 return;
229
230         first = FB_SHIFT_HIGH(p, ~0UL, dst_idx);
231         last = ~(FB_SHIFT_HIGH(p, ~0UL, (dst_idx+n) % bits));
232
233         if (dst_idx+n <= bits) {
234                 // Single word
235                 if (last)
236                         first &= last;
237                 dat = FB_READL(dst);
238                 FB_WRITEL(comp(dat ^ pat, dat, first), dst);
239         } else {
240                 // Multiple destination words
241
242                 // Leading bits
243                 if (first != 0UL) {
244                         dat = FB_READL(dst);
245                         FB_WRITEL(comp(dat ^ pat, dat, first), dst);
246                         dst++;
247                         pat = pat << left | pat >> right;
248                         n -= bits - dst_idx;
249                 }
250
251                 // Main chunk
252                 n /= bits;
253                 while (n >= 4) {
254                         FB_WRITEL(FB_READL(dst) ^ pat, dst);
255                         dst++;
256                         pat = pat << left | pat >> right;
257                         FB_WRITEL(FB_READL(dst) ^ pat, dst);
258                         dst++;
259                         pat = pat << left | pat >> right;
260                         FB_WRITEL(FB_READL(dst) ^ pat, dst);
261                         dst++;
262                         pat = pat << left | pat >> right;
263                         FB_WRITEL(FB_READL(dst) ^ pat, dst);
264                         dst++;
265                         pat = pat << left | pat >> right;
266                         n -= 4;
267                 }
268                 while (n--) {
269                         FB_WRITEL(FB_READL(dst) ^ pat, dst);
270                         dst++;
271                         pat = pat << left | pat >> right;
272                 }
273
274                 // Trailing bits
275                 if (last) {
276                         dat = FB_READL(dst);
277                         FB_WRITEL(comp(dat ^ pat, dat, last), dst);
278                 }
279         }
280 }
281
282 void cfb_fillrect(struct fb_info *p, const struct fb_fillrect *rect)
283 {
284         unsigned long pat, fg;
285         unsigned long width = rect->width, height = rect->height;
286         int bits = BITS_PER_LONG, bytes = bits >> 3;
287         u32 bpp = p->var.bits_per_pixel;
288         unsigned long __iomem *dst;
289         int dst_idx, left;
290
291         if (p->state != FBINFO_STATE_RUNNING)
292                 return;
293
294         if (p->fix.visual == FB_VISUAL_TRUECOLOR ||
295             p->fix.visual == FB_VISUAL_DIRECTCOLOR )
296                 fg = ((u32 *) (p->pseudo_palette))[rect->color];
297         else
298                 fg = rect->color;
299
300         pat = pixel_to_pat( bpp, fg);
301
302         dst = (unsigned long __iomem *)((unsigned long)p->screen_base & ~(bytes-1));
303         dst_idx = ((unsigned long)p->screen_base & (bytes - 1))*8;
304         dst_idx += rect->dy*p->fix.line_length*8+rect->dx*bpp;
305         /* FIXME For now we support 1-32 bpp only */
306         left = bits % bpp;
307         if (p->fbops->fb_sync)
308                 p->fbops->fb_sync(p);
309         if (!left) {
310                 u32 bswapmask = fb_compute_bswapmask(p);
311                 void (*fill_op32)(struct fb_info *p,
312                                   unsigned long __iomem *dst, int dst_idx,
313                                   unsigned long pat, unsigned n, int bits,
314                                   u32 bswapmask) = NULL;
315
316                 switch (rect->rop) {
317                 case ROP_XOR:
318                         fill_op32 = bitfill_aligned_rev;
319                         break;
320                 case ROP_COPY:
321                         fill_op32 = bitfill_aligned;
322                         break;
323                 default:
324                         printk( KERN_ERR "cfb_fillrect(): unknown rop, defaulting to ROP_COPY\n");
325                         fill_op32 = bitfill_aligned;
326                         break;
327                 }
328                 while (height--) {
329                         dst += dst_idx >> (ffs(bits) - 1);
330                         dst_idx &= (bits - 1);
331                         fill_op32(p, dst, dst_idx, pat, width*bpp, bits,
332                                   bswapmask);
333                         dst_idx += p->fix.line_length*8;
334                 }
335         } else {
336                 int right;
337                 int r;
338                 int rot = (left-dst_idx) % bpp;
339                 void (*fill_op)(struct fb_info *p, unsigned long __iomem *dst,
340                                 int dst_idx, unsigned long pat, int left,
341                                 int right, unsigned n, int bits) = NULL;
342
343                 /* rotate pattern to correct start position */
344                 pat = pat << rot | pat >> (bpp-rot);
345
346                 right = bpp-left;
347                 switch (rect->rop) {
348                 case ROP_XOR:
349                         fill_op = bitfill_unaligned_rev;
350                         break;
351                 case ROP_COPY:
352                         fill_op = bitfill_unaligned;
353                         break;
354                 default:
355                         printk( KERN_ERR "cfb_fillrect(): unknown rop, defaulting to ROP_COPY\n");
356                         fill_op = bitfill_unaligned;
357                         break;
358                 }
359                 while (height--) {
360                         dst += dst_idx >> (ffs(bits) - 1);
361                         dst_idx &= (bits - 1);
362                         fill_op(p, dst, dst_idx, pat, left, right,
363                                 width*bpp, bits);
364                         r = (p->fix.line_length*8) % bpp;
365                         pat = pat << (bpp-r) | pat >> r;
366                         dst_idx += p->fix.line_length*8;
367                 }
368         }
369 }
370
371 EXPORT_SYMBOL(cfb_fillrect);
372
373 MODULE_AUTHOR("James Simmons <jsimmons@users.sf.net>");
374 MODULE_DESCRIPTION("Generic software accelerated fill rectangle");
375 MODULE_LICENSE("GPL");