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(unsigned long __iomem *dst, int dst_idx, unsigned long pat,
  40                 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(dst_idx, bswapmask);
  48         last = ~fb_shifted_pixels_mask_long((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(unsigned long __iomem *dst, int dst_idx, unsigned long pat,
  97                         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(~0UL, dst_idx);
 105         last = ~(FB_SHIFT_HIGH(~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(unsigned long __iomem *dst, int dst_idx, unsigned long pat,
 151                 unsigned n, int bits, u32 bswapmask)
 152 {
 153         unsigned long val = pat, dat;
 154         unsigned long first, last;
 155
 156         if (!n)
 157                 return;
 158
 159         first = fb_shifted_pixels_mask_long(dst_idx, bswapmask);
 160         last = ~fb_shifted_pixels_mask_long((dst_idx+n) % bits, bswapmask);
 161
 162         if (dst_idx+n <= bits) {
 163                 // Single word
 164                 if (last)
 165                         first &= last;
 166                 dat = FB_READL(dst);
 167                 FB_WRITEL(comp(dat ^ val, dat, first), dst);
 168         } else {
 169                 // Multiple destination words
 170                 // Leading bits
 171                 if (first!=0UL) {
 172                         dat = FB_READL(dst);
 173                         FB_WRITEL(comp(dat ^ val, dat, first), dst);
 174                         dst++;
 175                         n -= bits - dst_idx;
 176                 }
 177
 178                 // Main chunk
 179                 n /= bits;
 180                 while (n >= 8) {
 181                         FB_WRITEL(FB_READL(dst) ^ val, dst);
 182                         dst++;
 183                         FB_WRITEL(FB_READL(dst) ^ val, dst);
 184                         dst++;
 185                         FB_WRITEL(FB_READL(dst) ^ val, dst);
 186                         dst++;
 187                         FB_WRITEL(FB_READL(dst) ^ val, dst);
 188                         dst++;
 189                         FB_WRITEL(FB_READL(dst) ^ val, dst);
 190                         dst++;
 191                         FB_WRITEL(FB_READL(dst) ^ val, dst);
 192                         dst++;
 193                         FB_WRITEL(FB_READL(dst) ^ val, dst);
 194                         dst++;
 195                         FB_WRITEL(FB_READL(dst) ^ val, dst);
 196                         dst++;
 197                         n -= 8;
 198                 }
 199                 while (n--) {
 200                         FB_WRITEL(FB_READL(dst) ^ val, dst);
 201                         dst++;
 202                 }
 203                 // Trailing bits
 204                 if (last) {
 205                         dat = FB_READL(dst);
 206                         FB_WRITEL(comp(dat ^ val, dat, last), dst);
 207                 }
 208         }
 209 }
 210
 211
 212     /*
 213      *  Unaligned generic pattern invert using 32/64-bit memory accesses
 214      *  The pattern must have been expanded to a full 32/64-bit value
 215      *  Left/right are the appropriate shifts to convert to the pattern to be
 216      *  used for the next 32/64-bit word
 217      */
 218
 219 static void
 220 bitfill_unaligned_rev(unsigned long __iomem *dst, int dst_idx, unsigned long pat,
 221                         int left, int right, unsigned n, int bits)
 222 {
 223         unsigned long first, last, dat;
 224
 225         if (!n)
 226                 return;
 227
 228         first = FB_SHIFT_HIGH(~0UL, dst_idx);
 229         last = ~(FB_SHIFT_HIGH(~0UL, (dst_idx+n) % bits));
 230
 231         if (dst_idx+n <= bits) {
 232                 // Single word
 233                 if (last)
 234                         first &= last;
 235                 dat = FB_READL(dst);
 236                 FB_WRITEL(comp(dat ^ pat, dat, first), dst);
 237         } else {
 238                 // Multiple destination words
 239
 240                 // Leading bits
 241                 if (first != 0UL) {
 242                         dat = FB_READL(dst);
 243                         FB_WRITEL(comp(dat ^ pat, dat, first), dst);
 244                         dst++;
 245                         pat = pat << left | pat >> right;
 246                         n -= bits - dst_idx;
 247                 }
 248
 249                 // Main chunk
 250                 n /= bits;
 251                 while (n >= 4) {
 252                         FB_WRITEL(FB_READL(dst) ^ pat, dst);
 253                         dst++;
 254                         pat = pat << left | pat >> right;
 255                         FB_WRITEL(FB_READL(dst) ^ pat, dst);
 256                         dst++;
 257                         pat = pat << left | pat >> right;
 258                         FB_WRITEL(FB_READL(dst) ^ pat, dst);
 259                         dst++;
 260                         pat = pat << left | pat >> right;
 261                         FB_WRITEL(FB_READL(dst) ^ pat, dst);
 262                         dst++;
 263                         pat = pat << left | pat >> right;
 264                         n -= 4;
 265                 }
 266                 while (n--) {
 267                         FB_WRITEL(FB_READL(dst) ^ pat, dst);
 268                         dst++;
 269                         pat = pat << left | pat >> right;
 270                 }
 271
 272                 // Trailing bits
 273                 if (last) {
 274                         dat = FB_READL(dst);
 275                         FB_WRITEL(comp(dat ^ pat, dat, last), dst);
 276                 }
 277         }
 278 }
 279
 280 void cfb_fillrect(struct fb_info *p, const struct fb_fillrect *rect)
 281 {
 282         unsigned long pat, fg;
 283         unsigned long width = rect->width, height = rect->height;
 284         int bits = BITS_PER_LONG, bytes = bits >> 3;
 285         u32 bpp = p->var.bits_per_pixel;
 286         unsigned long __iomem *dst;
 287         int dst_idx, left;
 288
 289         if (p->state != FBINFO_STATE_RUNNING)
 290                 return;
 291
 292         if (p->fix.visual == FB_VISUAL_TRUECOLOR ||
 293             p->fix.visual == FB_VISUAL_DIRECTCOLOR )
 294                 fg = ((u32 *) (p->pseudo_palette))[rect->color];
 295         else
 296                 fg = rect->color;
 297
 298         pat = pixel_to_pat( bpp, fg);
 299
 300         dst = (unsigned long __iomem *)((unsigned long)p->screen_base & ~(bytes-1));
 301         dst_idx = ((unsigned long)p->screen_base & (bytes - 1))*8;
 302         dst_idx += rect->dy*p->fix.line_length*8+rect->dx*bpp;
 303         /* FIXME For now we support 1-32 bpp only */
 304         left = bits % bpp;
 305         if (p->fbops->fb_sync)
 306                 p->fbops->fb_sync(p);
 307         if (!left) {
 308                 u32 bswapmask = fb_compute_bswapmask(p);
 309                 void (*fill_op32)(unsigned long __iomem *dst, int dst_idx,
 310                                   unsigned long pat, unsigned n, int bits,
 311                                   u32 bswapmask) = NULL;
 312
 313                 switch (rect->rop) {
 314                 case ROP_XOR:
 315                         fill_op32 = bitfill_aligned_rev;
 316                         break;
 317                 case ROP_COPY:
 318                         fill_op32 = bitfill_aligned;
 319                         break;
 320                 default:
 321                         printk( KERN_ERR "cfb_fillrect(): unknown rop, defaulting to ROP_COPY\n");
 322                         fill_op32 = bitfill_aligned;
 323                         break;
 324                 }
 325                 while (height--) {
 326                         dst += dst_idx >> (ffs(bits) - 1);
 327                         dst_idx &= (bits - 1);
 328                         fill_op32(dst, dst_idx, pat, width*bpp, bits, bswapmask);
 329                         dst_idx += p->fix.line_length*8;
 330                 }
 331         } else {
 332                 int right;
 333                 int r;
 334                 int rot = (left-dst_idx) % bpp;
 335                 void (*fill_op)(unsigned long __iomem *dst, int dst_idx,
 336                                 unsigned long pat, int left, int right,
 337                                 unsigned n, int bits) = NULL;
 338
 339                 /* rotate pattern to correct start position */
 340                 pat = pat << rot | pat >> (bpp-rot);
 341
 342                 right = bpp-left;
 343                 switch (rect->rop) {
 344                 case ROP_XOR:
 345                         fill_op = bitfill_unaligned_rev;
 346                         break;
 347                 case ROP_COPY:
 348                         fill_op = bitfill_unaligned;
 349                         break;
 350                 default:
 351                         printk( KERN_ERR "cfb_fillrect(): unknown rop, defaulting to ROP_COPY\n");
 352                         fill_op = bitfill_unaligned;
 353                         break;
 354                 }
 355                 while (height--) {
 356                         dst += dst_idx >> (ffs(bits) - 1);
 357                         dst_idx &= (bits - 1);
 358                         fill_op(dst, dst_idx, pat, left, right,
 359                                 width*bpp, bits);
 360                         r = (p->fix.line_length*8) % bpp;
 361                         pat = pat << (bpp-r) | pat >> r;
 362                         dst_idx += p->fix.line_length*8;
 363                 }
 364         }
 365 }
 366
 367 EXPORT_SYMBOL(cfb_fillrect);
 368
 369 MODULE_AUTHOR("James Simmons <jsimmons@users.sf.net>");
 370 MODULE_DESCRIPTION("Generic software accelerated fill rectangle");
 371 MODULE_LICENSE("GPL");