drivers/video/fbdev/core/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  *  Also need to add code to deal with cards endians that are different than
  13  *  the native cpu endians. I also need to deal with MSB position in the word.
  14  *
  15  */
  16 #include <linux/module.h>
  17 #include <linux/string.h>
  18 #include <linux/fb.h>
  19 #include <asm/types.h>
  20 #include "fb_draw.h"
  21
  22 #if BITS_PER_LONG == 32
  23 #  define FB_WRITEL fb_writel
  24 #  define FB_READL  fb_readl
  25 #else
  26 #  define FB_WRITEL fb_writeq
  27 #  define FB_READL  fb_readq
  28 #endif
  29
  30     /*
  31      *  Aligned pattern fill using 32/64-bit memory accesses
  32      */
  33
  34 static void
  35 bitfill_aligned(struct fb_info *p, unsigned long __iomem *dst, int dst_idx,
  36                 unsigned long pat, unsigned n, int bits, u32 bswapmask)
  37 {
  38         unsigned long first, last;
  39
  40         if (!n)
  41                 return;
  42
  43         first = fb_shifted_pixels_mask_long(p, dst_idx, bswapmask);
  44         last = ~fb_shifted_pixels_mask_long(p, (dst_idx+n) % bits, bswapmask);
  45
  46         if (dst_idx+n <= bits) {
  47                 // Single word
  48                 if (last)
  49                         first &= last;
  50                 FB_WRITEL(comp(pat, FB_READL(dst), first), dst);
  51         } else {
  52                 // Multiple destination words
  53
  54                 // Leading bits
  55                 if (first!= ~0UL) {
  56                         FB_WRITEL(comp(pat, FB_READL(dst), first), dst);
  57                         dst++;
  58                         n -= bits - dst_idx;
  59                 }
  60
  61                 // Main chunk
  62                 n /= bits;
  63                 while (n >= 8) {
  64                         FB_WRITEL(pat, dst++);
  65                         FB_WRITEL(pat, dst++);
  66                         FB_WRITEL(pat, dst++);
  67                         FB_WRITEL(pat, dst++);
  68                         FB_WRITEL(pat, dst++);
  69                         FB_WRITEL(pat, dst++);
  70                         FB_WRITEL(pat, dst++);
  71                         FB_WRITEL(pat, dst++);
  72                         n -= 8;
  73                 }
  74                 while (n--)
  75                         FB_WRITEL(pat, dst++);
  76
  77                 // Trailing bits
  78                 if (last)
  79                         FB_WRITEL(comp(pat, FB_READL(dst), last), dst);
  80         }
  81 }
  82
  83
  84     /*
  85      *  Unaligned generic pattern fill using 32/64-bit memory accesses
  86      *  The pattern must have been expanded to a full 32/64-bit value
  87      *  Left/right are the appropriate shifts to convert to the pattern to be
  88      *  used for the next 32/64-bit word
  89      */
  90
  91 static void
  92 bitfill_unaligned(struct fb_info *p, unsigned long __iomem *dst, int dst_idx,
  93                   unsigned long pat, int left, int right, unsigned n, int bits)
  94 {
  95         unsigned long first, last;
  96
  97         if (!n)
  98                 return;
  99
 100         first = FB_SHIFT_HIGH(p, ~0UL, dst_idx);
 101         last = ~(FB_SHIFT_HIGH(p, ~0UL, (dst_idx+n) % bits));
 102
 103         if (dst_idx+n <= bits) {
 104                 // Single word
 105                 if (last)
 106                         first &= last;
 107                 FB_WRITEL(comp(pat, FB_READL(dst), first), dst);
 108         } else {
 109                 // Multiple destination words
 110                 // Leading bits
 111                 if (first) {
 112                         FB_WRITEL(comp(pat, FB_READL(dst), first), dst);
 113                         dst++;
 114                         pat = pat << left | pat >> right;
 115                         n -= bits - dst_idx;
 116                 }
 117
 118                 // Main chunk
 119                 n /= bits;
 120                 while (n >= 4) {
 121                         FB_WRITEL(pat, dst++);
 122                         pat = pat << left | pat >> right;
 123                         FB_WRITEL(pat, dst++);
 124                         pat = pat << left | pat >> right;
 125                         FB_WRITEL(pat, dst++);
 126                         pat = pat << left | pat >> right;
 127                         FB_WRITEL(pat, dst++);
 128                         pat = pat << left | pat >> right;
 129                         n -= 4;
 130                 }
 131                 while (n--) {
 132                         FB_WRITEL(pat, dst++);
 133                         pat = pat << left | pat >> right;
 134                 }
 135
 136                 // Trailing bits
 137                 if (last)
 138                         FB_WRITEL(comp(pat, FB_READL(dst), last), dst);
 139         }
 140 }
 141
 142     /*
 143      *  Aligned pattern invert using 32/64-bit memory accesses
 144      */
 145 static void
 146 bitfill_aligned_rev(struct fb_info *p, unsigned long __iomem *dst,
 147                     int dst_idx, unsigned long pat, unsigned n, int bits,
 148                     u32 bswapmask)
 149 {
 150         unsigned long val = pat, dat;
 151         unsigned long first, last;
 152
 153         if (!n)
 154                 return;
 155
 156         first = fb_shifted_pixels_mask_long(p, dst_idx, bswapmask);
 157         last = ~fb_shifted_pixels_mask_long(p, (dst_idx+n) % bits, bswapmask);
 158
 159         if (dst_idx+n <= bits) {
 160                 // Single word
 161                 if (last)
 162                         first &= last;
 163                 dat = FB_READL(dst);
 164                 FB_WRITEL(comp(dat ^ val, dat, first), dst);
 165         } else {
 166                 // Multiple destination words
 167                 // Leading bits
 168                 if (first!=0UL) {
 169                         dat = FB_READL(dst);
 170                         FB_WRITEL(comp(dat ^ val, dat, first), dst);
 171                         dst++;
 172                         n -= bits - dst_idx;
 173                 }
 174
 175                 // Main chunk
 176                 n /= bits;
 177                 while (n >= 8) {
 178                         FB_WRITEL(FB_READL(dst) ^ val, dst);
 179                         dst++;
 180                         FB_WRITEL(FB_READL(dst) ^ val, dst);
 181                         dst++;
 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                         n -= 8;
 195                 }
 196                 while (n--) {
 197                         FB_WRITEL(FB_READL(dst) ^ val, dst);
 198                         dst++;
 199                 }
 200                 // Trailing bits
 201                 if (last) {
 202                         dat = FB_READL(dst);
 203                         FB_WRITEL(comp(dat ^ val, dat, last), dst);
 204                 }
 205         }
 206 }
 207
 208
 209     /*
 210      *  Unaligned generic pattern invert using 32/64-bit memory accesses
 211      *  The pattern must have been expanded to a full 32/64-bit value
 212      *  Left/right are the appropriate shifts to convert to the pattern to be
 213      *  used for the next 32/64-bit word
 214      */
 215
 216 static void
 217 bitfill_unaligned_rev(struct fb_info *p, unsigned long __iomem *dst,
 218                       int dst_idx, unsigned long pat, int left, int right,
 219                       unsigned n, int bits)
 220 {
 221         unsigned long first, last, dat;
 222
 223         if (!n)
 224                 return;
 225
 226         first = FB_SHIFT_HIGH(p, ~0UL, dst_idx);
 227         last = ~(FB_SHIFT_HIGH(p, ~0UL, (dst_idx+n) % bits));
 228
 229         if (dst_idx+n <= bits) {
 230                 // Single word
 231                 if (last)
 232                         first &= last;
 233                 dat = FB_READL(dst);
 234                 FB_WRITEL(comp(dat ^ pat, dat, first), dst);
 235         } else {
 236                 // Multiple destination words
 237
 238                 // Leading bits
 239                 if (first != 0UL) {
 240                         dat = FB_READL(dst);
 241                         FB_WRITEL(comp(dat ^ pat, dat, first), dst);
 242                         dst++;
 243                         pat = pat << left | pat >> right;
 244                         n -= bits - dst_idx;
 245                 }
 246
 247                 // Main chunk
 248                 n /= bits;
 249                 while (n >= 4) {
 250                         FB_WRITEL(FB_READL(dst) ^ pat, dst);
 251                         dst++;
 252                         pat = pat << left | pat >> right;
 253                         FB_WRITEL(FB_READL(dst) ^ pat, dst);
 254                         dst++;
 255                         pat = pat << left | pat >> right;
 256                         FB_WRITEL(FB_READL(dst) ^ pat, dst);
 257                         dst++;
 258                         pat = pat << left | pat >> right;
 259                         FB_WRITEL(FB_READL(dst) ^ pat, dst);
 260                         dst++;
 261                         pat = pat << left | pat >> right;
 262                         n -= 4;
 263                 }
 264                 while (n--) {
 265                         FB_WRITEL(FB_READL(dst) ^ pat, dst);
 266                         dst++;
 267                         pat = pat << left | pat >> right;
 268                 }
 269
 270                 // Trailing bits
 271                 if (last) {
 272                         dat = FB_READL(dst);
 273                         FB_WRITEL(comp(dat ^ pat, dat, last), dst);
 274                 }
 275         }
 276 }
 277
 278 void cfb_fillrect(struct fb_info *p, const struct fb_fillrect *rect)
 279 {
 280         unsigned long pat, pat2, fg;
 281         unsigned long width = rect->width, height = rect->height;
 282         int bits = BITS_PER_LONG, bytes = bits >> 3;
 283         u32 bpp = p->var.bits_per_pixel;
 284         unsigned long __iomem *dst;
 285         int dst_idx, left;
 286
 287         if (p->state != FBINFO_STATE_RUNNING)
 288                 return;
 289
 290         if (p->fix.visual == FB_VISUAL_TRUECOLOR ||
 291             p->fix.visual == FB_VISUAL_DIRECTCOLOR )
 292                 fg = ((u32 *) (p->pseudo_palette))[rect->color];
 293         else
 294                 fg = rect->color;
 295
 296         pat = pixel_to_pat(bpp, fg);
 297
 298         dst = (unsigned long __iomem *)((unsigned long)p->screen_base & ~(bytes-1));
 299         dst_idx = ((unsigned long)p->screen_base & (bytes - 1))*8;
 300         dst_idx += rect->dy*p->fix.line_length*8+rect->dx*bpp;
 301         /* FIXME For now we support 1-32 bpp only */
 302         left = bits % bpp;
 303         if (p->fbops->fb_sync)
 304                 p->fbops->fb_sync(p);
 305         if (!left) {
 306                 u32 bswapmask = fb_compute_bswapmask(p);
 307                 void (*fill_op32)(struct fb_info *p,
 308                                   unsigned long __iomem *dst, int dst_idx,
 309                                   unsigned long pat, unsigned n, int bits,
 310                                   u32 bswapmask) = NULL;
 311
 312                 switch (rect->rop) {
 313                 case ROP_XOR:
 314                         fill_op32 = bitfill_aligned_rev;
 315                         break;
 316                 case ROP_COPY:
 317                         fill_op32 = bitfill_aligned;
 318                         break;
 319                 default:
 320                         printk( KERN_ERR "cfb_fillrect(): unknown rop, defaulting to ROP_COPY\n");
 321                         fill_op32 = bitfill_aligned;
 322                         break;
 323                 }
 324                 while (height--) {
 325                         dst += dst_idx >> (ffs(bits) - 1);
 326                         dst_idx &= (bits - 1);
 327                         fill_op32(p, dst, dst_idx, pat, width*bpp, bits,
 328                                   bswapmask);
 329                         dst_idx += p->fix.line_length*8;
 330                 }
 331         } else {
 332                 int right, r;
 333                 void (*fill_op)(struct fb_info *p, unsigned long __iomem *dst,
 334                                 int dst_idx, unsigned long pat, int left,
 335                                 int right, unsigned n, int bits) = NULL;
 336 #ifdef __LITTLE_ENDIAN
 337                 right = left;
 338                 left = bpp - right;
 339 #else
 340                 right = bpp - left;
 341 #endif
 342                 switch (rect->rop) {
 343                 case ROP_XOR:
 344                         fill_op = bitfill_unaligned_rev;
 345                         break;
 346                 case ROP_COPY:
 347                         fill_op = bitfill_unaligned;
 348                         break;
 349                 default:
 350                         printk(KERN_ERR "cfb_fillrect(): unknown rop, defaulting to ROP_COPY\n");
 351                         fill_op = bitfill_unaligned;
 352                         break;
 353                 }
 354                 while (height--) {
 355                         dst += dst_idx / bits;
 356                         dst_idx &= (bits - 1);
 357                         r = dst_idx % bpp;
 358                         /* rotate pattern to the correct start position */
 359                         pat2 = le_long_to_cpu(rolx(cpu_to_le_long(pat), r, bpp));
 360                         fill_op(p, dst, dst_idx, pat2, left, right,
 361                                 width*bpp, bits);
 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");