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   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, unsigned n, int bits)
  40 {
  41         unsigned long first, last;
  42
  43         if (!n)
  44                 return;
  45
  46         first = FB_SHIFT_HIGH(~0UL, dst_idx);
  47         last = ~(FB_SHIFT_HIGH(~0UL, (dst_idx+n) % bits));
  48
  49         if (dst_idx+n <= bits) {
  50                 // Single word
  51                 if (last)
  52                         first &= last;
  53                 FB_WRITEL(comp(pat, FB_READL(dst), first), dst);
  54         } else {
  55                 // Multiple destination words
  56
  57                 // Leading bits
  58                 if (first!= ~0UL) {
  59                         FB_WRITEL(comp(pat, FB_READL(dst), first), dst);
  60                         dst++;
  61                         n -= bits - dst_idx;
  62                 }
  63
  64                 // Main chunk
  65                 n /= bits;
  66                 while (n >= 8) {
  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                         FB_WRITEL(pat, dst++);
  73                         FB_WRITEL(pat, dst++);
  74                         FB_WRITEL(pat, dst++);
  75                         n -= 8;
  76                 }
  77                 while (n--)
  78                         FB_WRITEL(pat, dst++);
  79
  80                 // Trailing bits
  81                 if (last)
  82                         FB_WRITEL(comp(pat, FB_READL(dst), last), dst);
  83         }
  84 }
  85
  86
  87     /*
  88      *  Unaligned generic pattern fill using 32/64-bit memory accesses
  89      *  The pattern must have been expanded to a full 32/64-bit value
  90      *  Left/right are the appropriate shifts to convert to the pattern to be
  91      *  used for the next 32/64-bit word
  92      */
  93
  94 static void
  95 bitfill_unaligned(unsigned long __iomem *dst, int dst_idx, unsigned long pat,
  96                         int left, int right, unsigned n, int bits)
  97 {
  98         unsigned long first, last;
  99
 100         if (!n)
 101                 return;
 102
 103         first = FB_SHIFT_HIGH(~0UL, dst_idx);
 104         last = ~(FB_SHIFT_HIGH(~0UL, (dst_idx+n) % bits));
 105
 106         if (dst_idx+n <= bits) {
 107                 // Single word
 108                 if (last)
 109                         first &= last;
 110                 FB_WRITEL(comp(pat, FB_READL(dst), first), dst);
 111         } else {
 112                 // Multiple destination words
 113                 // Leading bits
 114                 if (first) {
 115                         FB_WRITEL(comp(pat, FB_READL(dst), first), dst);
 116                         dst++;
 117                         pat = pat << left | pat >> right;
 118                         n -= bits - dst_idx;
 119                 }
 120
 121                 // Main chunk
 122                 n /= bits;
 123                 while (n >= 4) {
 124                         FB_WRITEL(pat, dst++);
 125                         pat = pat << left | pat >> right;
 126                         FB_WRITEL(pat, dst++);
 127                         pat = pat << left | pat >> right;
 128                         FB_WRITEL(pat, dst++);
 129                         pat = pat << left | pat >> right;
 130                         FB_WRITEL(pat, dst++);
 131                         pat = pat << left | pat >> right;
 132                         n -= 4;
 133                 }
 134                 while (n--) {
 135                         FB_WRITEL(pat, dst++);
 136                         pat = pat << left | pat >> right;
 137                 }
 138
 139                 // Trailing bits
 140                 if (last)
 141                         FB_WRITEL(comp(pat, FB_READL(dst), first), dst);
 142         }
 143 }
 144
 145     /*
 146      *  Aligned pattern invert using 32/64-bit memory accesses
 147      */
 148 static void
 149 bitfill_aligned_rev(unsigned long __iomem *dst, int dst_idx, unsigned long pat, unsigned n, int bits)
 150 {
 151         unsigned long val = pat, dat;
 152         unsigned long first, last;
 153
 154         if (!n)
 155                 return;
 156
 157         first = FB_SHIFT_HIGH(~0UL, dst_idx);
 158         last = ~(FB_SHIFT_HIGH(~0UL, (dst_idx+n) % bits));
 159
 160         if (dst_idx+n <= bits) {
 161                 // Single word
 162                 if (last)
 163                         first &= last;
 164                 dat = FB_READL(dst);
 165                 FB_WRITEL(comp(dat ^ val, dat, first), dst);
 166         } else {
 167                 // Multiple destination words
 168                 // Leading bits
 169                 if (first!=0UL) {
 170                         dat = FB_READL(dst);
 171                         FB_WRITEL(comp(dat ^ val, dat, first), dst);
 172                         dst++;
 173                         n -= bits - dst_idx;
 174                 }
 175
 176                 // Main chunk
 177                 n /= bits;
 178                 while (n >= 8) {
 179                         FB_WRITEL(FB_READL(dst) ^ val, dst);
 180                         dst++;
 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                         n -= 8;
 196                 }
 197                 while (n--) {
 198                         FB_WRITEL(FB_READL(dst) ^ val, dst);
 199                         dst++;
 200                 }
 201                 // Trailing bits
 202                 if (last) {
 203                         dat = FB_READL(dst);
 204                         FB_WRITEL(comp(dat ^ val, dat, last), dst);
 205                 }
 206         }
 207 }
 208
 209
 210     /*
 211      *  Unaligned generic pattern invert using 32/64-bit memory accesses
 212      *  The pattern must have been expanded to a full 32/64-bit value
 213      *  Left/right are the appropriate shifts to convert to the pattern to be
 214      *  used for the next 32/64-bit word
 215      */
 216
 217 static void
 218 bitfill_unaligned_rev(unsigned long __iomem *dst, int dst_idx, unsigned long pat,
 219                         int left, int right, unsigned n, int bits)
 220 {
 221         unsigned long first, last, dat;
 222
 223         if (!n)
 224                 return;
 225
 226         first = FB_SHIFT_HIGH(~0UL, dst_idx);
 227         last = ~(FB_SHIFT_HIGH(~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, 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                 void (*fill_op32)(unsigned long __iomem *dst, int dst_idx,
 307                                   unsigned long pat, unsigned n, int bits) = NULL;
 308
 309                 switch (rect->rop) {
 310                 case ROP_XOR:
 311                         fill_op32 = bitfill_aligned_rev;
 312                         break;
 313                 case ROP_COPY:
 314                         fill_op32 = bitfill_aligned;
 315                         break;
 316                 default:
 317                         printk( KERN_ERR "cfb_fillrect(): unknown rop, defaulting to ROP_COPY\n");
 318                         fill_op32 = bitfill_aligned;
 319                         break;
 320                 }
 321                 while (height--) {
 322                         dst += dst_idx >> (ffs(bits) - 1);
 323                         dst_idx &= (bits - 1);
 324                         fill_op32(dst, dst_idx, pat, width*bpp, bits);
 325                         dst_idx += p->fix.line_length*8;
 326                 }
 327         } else {
 328                 int right;
 329                 int r;
 330                 int rot = (left-dst_idx) % bpp;
 331                 void (*fill_op)(unsigned long __iomem *dst, int dst_idx,
 332                                 unsigned long pat, int left, int right,
 333                                 unsigned n, int bits) = NULL;
 334
 335                 /* rotate pattern to correct start position */
 336                 pat = pat << rot | pat >> (bpp-rot);
 337
 338                 right = bpp-left;
 339                 switch (rect->rop) {
 340                 case ROP_XOR:
 341                         fill_op = bitfill_unaligned_rev;
 342                         break;
 343                 case ROP_COPY:
 344                         fill_op = bitfill_unaligned;
 345                         break;
 346                 default:
 347                         printk( KERN_ERR "cfb_fillrect(): unknown rop, defaulting to ROP_COPY\n");
 348                         fill_op = bitfill_unaligned;
 349                         break;
 350                 }
 351                 while (height--) {
 352                         dst += dst_idx >> (ffs(bits) - 1);
 353                         dst_idx &= (bits - 1);
 354                         fill_op(dst, dst_idx, pat, left, right,
 355                                 width*bpp, bits);
 356                         r = (p->fix.line_length*8) % bpp;
 357                         pat = pat << (bpp-r) | pat >> r;
 358                         dst_idx += p->fix.line_length*8;
 359                 }
 360         }
 361 }
 362
 363 EXPORT_SYMBOL(cfb_fillrect);
 364
 365 MODULE_AUTHOR("James Simmons <jsimmons@users.sf.net>");
 366 MODULE_DESCRIPTION("Generic software accelerated fill rectangle");
 367 MODULE_LICENSE("GPL");