i386/linux-2.3.21/drivers/video/fbcon-cfb16.c

   1 /*
   2  *  linux/drivers/video/cfb16.c -- Low level frame buffer operations for 16 bpp
   3  *                                 truecolor packed pixels
   4  *
   5  *      Created 5 Apr 1997 by Geert Uytterhoeven
   6  *
   7  *  This file is subject to the terms and conditions of the GNU General Public
   8  *  License.  See the file COPYING in the main directory of this archive for
   9  *  more details.
  10  */
  11
  12 #include <linux/module.h>
  13 #include <linux/tty.h>
  14 #include <linux/console.h>
  15 #include <linux/string.h>
  16 #include <linux/fb.h>
  17 #include <asm/io.h>
  18
  19 #include <video/fbcon.h>
  20 #include <video/fbcon-cfb16.h>
  21
  22
  23     /*
  24      *  16 bpp packed pixels
  25      */
  26
  27 static u32 tab_cfb16[] = {
  28 #if defined(__BIG_ENDIAN)
  29     0x00000000, 0x0000ffff, 0xffff0000, 0xffffffff
  30 #elif defined(__LITTLE_ENDIAN)
  31     0x00000000, 0xffff0000, 0x0000ffff, 0xffffffff
  32 #else
  33 #error FIXME: No endianness??
  34 #endif
  35 };
  36
  37 void fbcon_cfb16_setup(struct display *p)
  38 {
  39     p->next_line = p->line_length ? p->line_length : p->var.xres_virtual<<1;
  40     p->next_plane = 0;
  41 }
  42
  43 void fbcon_cfb16_bmove(struct display *p, int sy, int sx, int dy, int dx,
  44                        int height, int width)
  45 {
  46     int bytes = p->next_line, linesize = bytes * fontheight(p), rows;
  47     u8 *src, *dst;
  48
  49     if (sx == 0 && dx == 0 && width * fontwidth(p) * 2 == bytes) {
  50         fb_memmove(p->screen_base + dy * linesize,
  51                   p->screen_base + sy * linesize,
  52                   height * linesize);
  53         return;
  54     }
  55     if (fontwidthlog(p)) {
  56         sx <<= fontwidthlog(p)+1;
  57         dx <<= fontwidthlog(p)+1;
  58         width <<= fontwidthlog(p)+1;
  59     } else {
  60         sx *= fontwidth(p)*2;
  61         dx *= fontwidth(p)*2;
  62         width *= fontwidth(p)*2;
  63     }
  64     if (dy < sy || (dy == sy && dx < sx)) {
  65         src = p->screen_base + sy * linesize + sx;
  66         dst = p->screen_base + dy * linesize + dx;
  67         for (rows = height * fontheight(p); rows--;) {
  68             fb_memmove(dst, src, width);
  69             src += bytes;
  70             dst += bytes;
  71         }
  72     } else {
  73         src = p->screen_base + (sy+height) * linesize + sx - bytes;
  74         dst = p->screen_base + (dy+height) * linesize + dx - bytes;
  75         for (rows = height * fontheight(p); rows--;) {
  76             fb_memmove(dst, src, width);
  77             src -= bytes;
  78             dst -= bytes;
  79         }
  80     }
  81 }
  82
  83 static inline void rectfill(u8 *dest, int width, int height, u32 data,
  84                             int linesize)
  85 {
  86     int i;
  87
  88     data |= data<<16;
  89
  90     while (height-- > 0) {
  91         u32 *p = (u32 *)dest;
  92         for (i = 0; i < width/4; i++) {
  93             fb_writel(data, p++);
  94             fb_writel(data, p++);
  95         }
  96         if (width & 2)
  97             fb_writel(data, p++);
  98         if (width & 1)
  99             fb_writew(data, (u16*)p);
 100         dest += linesize;
 101     }
 102 }
 103
 104 void fbcon_cfb16_clear(struct vc_data *conp, struct display *p, int sy, int sx,
 105                        int height, int width)
 106 {
 107     u8 *dest;
 108     int bytes = p->next_line, lines = height * fontheight(p);
 109     u32 bgx;
 110
 111     dest = p->screen_base + sy * fontheight(p) * bytes + sx * fontwidth(p) * 2;
 112
 113     bgx = ((u16 *)p->dispsw_data)[attr_bgcol_ec(p, conp)];
 114
 115     width *= fontwidth(p)/4;
 116     if (width * 8 == bytes)
 117         rectfill(dest, lines * width * 4, 1, bgx, bytes);
 118     else
 119         rectfill(dest, width * 4, lines, bgx, bytes);
 120 }
 121
 122 void fbcon_cfb16_putc(struct vc_data *conp, struct display *p, int c, int yy,
 123                       int xx)
 124 {
 125     u8 *dest, *cdat, bits;
 126     int bytes = p->next_line, rows;
 127     u32 eorx, fgx, bgx;
 128
 129     dest = p->screen_base + yy * fontheight(p) * bytes + xx * fontwidth(p) * 2;
 130
 131     fgx = ((u16 *)p->dispsw_data)[attr_fgcol(p, c)];
 132     bgx = ((u16 *)p->dispsw_data)[attr_bgcol(p, c)];
 133     fgx |= (fgx << 16);
 134     bgx |= (bgx << 16);
 135     eorx = fgx ^ bgx;
 136
 137     switch (fontwidth(p)) {
 138     case 4:
 139     case 8:
 140         cdat = p->fontdata + (c & p->charmask) * fontheight(p);
 141         for (rows = fontheight(p); rows--; dest += bytes) {
 142             bits = *cdat++;
 143             fb_writel((tab_cfb16[bits >> 6] & eorx) ^ bgx, dest);
 144             fb_writel((tab_cfb16[bits >> 4 & 3] & eorx) ^ bgx, dest+4);
 145             if (fontwidth(p) == 8) {
 146                 fb_writel((tab_cfb16[bits >> 2 & 3] & eorx) ^ bgx, dest+8);
 147                 fb_writel((tab_cfb16[bits & 3] & eorx) ^ bgx, dest+12);
 148             }
 149         }
 150         break;
 151     case 12:
 152     case 16:
 153         cdat = p->fontdata + ((c & p->charmask) * fontheight(p) << 1);
 154         for (rows = fontheight(p); rows--; dest += bytes) {
 155             bits = *cdat++;
 156             fb_writel((tab_cfb16[bits >> 6] & eorx) ^ bgx, dest);
 157             fb_writel((tab_cfb16[bits >> 4 & 3] & eorx) ^ bgx, dest+4);
 158             fb_writel((tab_cfb16[bits >> 2 & 3] & eorx) ^ bgx, dest+8);
 159             fb_writel((tab_cfb16[bits & 3] & eorx) ^ bgx, dest+12);
 160             bits = *cdat++;
 161             fb_writel((tab_cfb16[bits >> 6] & eorx) ^ bgx, dest+16);
 162             fb_writel((tab_cfb16[bits >> 4 & 3] & eorx) ^ bgx, dest+20);
 163             if (fontwidth(p) == 16) {
 164                 fb_writel((tab_cfb16[bits >> 2 & 3] & eorx) ^ bgx, dest+24);
 165                 fb_writel((tab_cfb16[bits & 3] & eorx) ^ bgx, dest+28);
 166             }
 167         }
 168         break;
 169     }
 170 }
 171
 172 void fbcon_cfb16_putcs(struct vc_data *conp, struct display *p,
 173                        const unsigned short *s, int count, int yy, int xx)
 174 {
 175     u8 *cdat, *dest, *dest0;
 176     u16 c;
 177     int rows, bytes = p->next_line;
 178     u32 eorx, fgx, bgx;
 179
 180     dest0 = p->screen_base + yy * fontheight(p) * bytes + xx * fontwidth(p) * 2;
 181     fgx = ((u16 *)p->dispsw_data)[attr_fgcol(p, scr_readw(s))];
 182     bgx = ((u16 *)p->dispsw_data)[attr_bgcol(p, scr_readw(s))];
 183     fgx |= (fgx << 16);
 184     bgx |= (bgx << 16);
 185     eorx = fgx ^ bgx;
 186
 187     switch (fontwidth(p)) {
 188     case 4:
 189     case 8:
 190         while (count--) {
 191             c = scr_readw(s++) & p->charmask;
 192             cdat = p->fontdata + c * fontheight(p);
 193             for (rows = fontheight(p), dest = dest0; rows--; dest += bytes) {
 194                 u8 bits = *cdat++;
 195                 fb_writel((tab_cfb16[bits >> 6] & eorx) ^ bgx, dest);
 196                 fb_writel((tab_cfb16[bits >> 4 & 3] & eorx) ^ bgx, dest+4);
 197                 if (fontwidth(p) == 8) {
 198                     fb_writel((tab_cfb16[bits >> 2 & 3] & eorx) ^ bgx, dest+8);
 199                     fb_writel((tab_cfb16[bits & 3] & eorx) ^ bgx, dest+12);
 200                 }
 201             }
 202             dest0 += fontwidth(p)*2;;
 203         }
 204         break;
 205     case 12:
 206     case 16:
 207         while (count--) {
 208             c = scr_readw(s++) & p->charmask;
 209             cdat = p->fontdata + (c * fontheight(p) << 1);
 210             for (rows = fontheight(p), dest = dest0; rows--; dest += bytes) {
 211                 u8 bits = *cdat++;
 212                 fb_writel((tab_cfb16[bits >> 6] & eorx) ^ bgx, dest);
 213                 fb_writel((tab_cfb16[bits >> 4 & 3] & eorx) ^ bgx, dest+4);
 214                 fb_writel((tab_cfb16[bits >> 2 & 3] & eorx) ^ bgx, dest+8);
 215                 fb_writel((tab_cfb16[bits & 3] & eorx) ^ bgx, dest+12);
 216                 bits = *cdat++;
 217                 fb_writel((tab_cfb16[bits >> 6] & eorx) ^ bgx, dest+16);
 218                 fb_writel((tab_cfb16[bits >> 4 & 3] & eorx) ^ bgx, dest+20);
 219                 if (fontwidth(p) == 16) {
 220                     fb_writel((tab_cfb16[bits >> 2 & 3] & eorx) ^ bgx, dest+24);
 221                     fb_writel((tab_cfb16[bits & 3] & eorx) ^ bgx, dest+28);
 222                 }
 223             }
 224             dest0 += fontwidth(p)*2;
 225         }
 226         break;
 227     }
 228 }
 229
 230 void fbcon_cfb16_revc(struct display *p, int xx, int yy)
 231 {
 232     u8 *dest;
 233     int bytes = p->next_line, rows;
 234
 235     dest = p->screen_base + yy * fontheight(p) * bytes + xx * fontwidth(p)*2;
 236     for (rows = fontheight(p); rows--; dest += bytes) {
 237         switch (fontwidth(p)) {
 238         case 16:
 239             fb_writel(fb_readl(dest+24) ^ 0xffffffff, dest+24);
 240             fb_writel(fb_readl(dest+28) ^ 0xffffffff, dest+28);
 241             /* FALL THROUGH */
 242         case 12:
 243             fb_writel(fb_readl(dest+16) ^ 0xffffffff, dest+16);
 244             fb_writel(fb_readl(dest+20) ^ 0xffffffff, dest+20);
 245             /* FALL THROUGH */
 246         case 8:
 247             fb_writel(fb_readl(dest+8) ^ 0xffffffff, dest+8);
 248             fb_writel(fb_readl(dest+12) ^ 0xffffffff, dest+12);
 249             /* FALL THROUGH */
 250         case 4:
 251             fb_writel(fb_readl(dest+0) ^ 0xffffffff, dest+0);
 252             fb_writel(fb_readl(dest+4) ^ 0xffffffff, dest+4);
 253         }
 254     }
 255 }
 256
 257 void fbcon_cfb16_clear_margins(struct vc_data *conp, struct display *p,
 258                                int bottom_only)
 259 {
 260     int bytes = p->next_line;
 261     u32 bgx;
 262
 263     unsigned int right_start = conp->vc_cols*fontwidth(p);
 264     unsigned int bottom_start = conp->vc_rows*fontheight(p);
 265     unsigned int right_width, bottom_width;
 266
 267     bgx = ((u16 *)p->dispsw_data)[attr_bgcol_ec(p, conp)];
 268
 269     if (!bottom_only && (right_width = p->var.xres-right_start))
 270         rectfill(p->screen_base+right_start*2, right_width,
 271                  p->var.yres_virtual, bgx, bytes);
 272     if ((bottom_width = p->var.yres-bottom_start))
 273         rectfill(p->screen_base+(p->var.yoffset+bottom_start)*bytes,
 274                  right_start, bottom_width, bgx, bytes);
 275 }
 276
 277
 278     /*
 279      *  `switch' for the low level operations
 280      */
 281
 282 struct display_switch fbcon_cfb16 = {
 283     fbcon_cfb16_setup, fbcon_cfb16_bmove, fbcon_cfb16_clear, fbcon_cfb16_putc,
 284     fbcon_cfb16_putcs, fbcon_cfb16_revc, NULL, NULL, fbcon_cfb16_clear_margins,
 285     FONTWIDTH(4)|FONTWIDTH(8)|FONTWIDTH(12)|FONTWIDTH(16)
 286 };
 287
 288
 289 #ifdef MODULE
 290 int init_module(void)
 291 {
 292     return 0;
 293 }
 294
 295 void cleanup_module(void)
 296 {}
 297 #endif /* MODULE */
 298
 299
 300     /*
 301      *  Visible symbols for modules
 302      */
 303
 304 EXPORT_SYMBOL(fbcon_cfb16);
 305 EXPORT_SYMBOL(fbcon_cfb16_setup);
 306 EXPORT_SYMBOL(fbcon_cfb16_bmove);
 307 EXPORT_SYMBOL(fbcon_cfb16_clear);
 308 EXPORT_SYMBOL(fbcon_cfb16_putc);
 309 EXPORT_SYMBOL(fbcon_cfb16_putcs);
 310 EXPORT_SYMBOL(fbcon_cfb16_revc);
 311 EXPORT_SYMBOL(fbcon_cfb16_clear_margins);