1 /* 2 * linux/drivers/video/iplan2p4.c -- Low level frame buffer operations for 3 * interleaved bitplanes à la Atari (4 4 * planes, 2 bytes interleave) 5 * 6 * Created 5 Apr 1997 by Geert Uytterhoeven 7 * 8 * This file is subject to the terms and conditions of the GNU General Public 9 * License. See the file COPYING in the main directory of this archive for 10 * more details. 11 */ 12 13 #include <linux/module.h> 14 #include <linux/string.h> 15 #include <linux/fb.h> 16 17 #include <asm/setup.h> 18 19 #include "atafb.h" 20 21 #define BPL 4 22 #include "atafb_utils.h" 23 24 void atafb_iplan2p4_copyarea(struct fb_info *info, u_long next_line, 25 int sy, int sx, int dy, int dx, 26 int height, int width) 27 { 28 /* bmove() has to distinguish two major cases: If both, source and 29 * destination, start at even addresses or both are at odd 30 * addresses, just the first odd and last even column (if present) 31 * require special treatment (memmove_col()). The rest between 32 * then can be copied by normal operations, because all adjacent 33 * bytes are affected and are to be stored in the same order. 34 * The pathological case is when the move should go from an odd 35 * address to an even or vice versa. Since the bytes in the plane 36 * words must be assembled in new order, it seems wisest to make 37 * all movements by memmove_col(). 38 */ 39 40 u8 *src, *dst; 41 u32 *s, *d; 42 int w, l , i, j; 43 u_int colsize; 44 u_int upwards = (dy < sy) || (dy == sy && dx < sx); 45 46 colsize = height; 47 if (!((sx ^ dx) & 15)) { 48 /* odd->odd or even->even */ 49 50 if (upwards) { 51 src = (u8 *)info->screen_base + sy * next_line + (sx & ~15) / (8 / BPL); 52 dst = (u8 *)info->screen_base + dy * next_line + (dx & ~15) / (8 / BPL); 53 if (sx & 15) { 54 memmove32_col(dst, src, 0xff00ff, height, next_line - BPL * 2); 55 src += BPL * 2; 56 dst += BPL * 2; 57 width -= 8; 58 } 59 w = width >> 4; 60 if (w) { 61 s = (u32 *)src; 62 d = (u32 *)dst; 63 w *= BPL / 2; 64 l = next_line - w * 4; 65 for (j = height; j > 0; j--) { 66 for (i = w; i > 0; i--) 67 *d++ = *s++; 68 s = (u32 *)((u8 *)s + l); 69 d = (u32 *)((u8 *)d + l); 70 } 71 } 72 if (width & 15) 73 memmove32_col(dst + width / (8 / BPL), src + width / (8 / BPL), 74 0xff00ff00, height, next_line - BPL * 2); 75 } else { 76 src = (u8 *)info->screen_base + (sy - 1) * next_line + ((sx + width + 8) & ~15) / (8 / BPL); 77 dst = (u8 *)info->screen_base + (dy - 1) * next_line + ((dx + width + 8) & ~15) / (8 / BPL); 78 79 if ((sx + width) & 15) { 80 src -= BPL * 2; 81 dst -= BPL * 2; 82 memmove32_col(dst, src, 0xff00ff00, colsize, -next_line - BPL * 2); 83 width -= 8; 84 } 85 w = width >> 4; 86 if (w) { 87 s = (u32 *)src; 88 d = (u32 *)dst; 89 w *= BPL / 2; 90 l = next_line - w * 4; 91 for (j = height; j > 0; j--) { 92 for (i = w; i > 0; i--) 93 *--d = *--s; 94 s = (u32 *)((u8 *)s - l); 95 d = (u32 *)((u8 *)d - l); 96 } 97 } 98 if (sx & 15) 99 memmove32_col(dst - (width - 16) / (8 / BPL), 100 src - (width - 16) / (8 / BPL), 101 0xff00ff, colsize, -next_line - BPL * 2); 102 } 103 } else { 104 /* odd->even or even->odd */ 105 if (upwards) { 106 u32 *src32, *dst32; 107 u32 pval[4], v, v1, mask; 108 int i, j, w, f; 109 110 src = (u8 *)info->screen_base + sy * next_line + (sx & ~15) / (8 / BPL); 111 dst = (u8 *)info->screen_base + dy * next_line + (dx & ~15) / (8 / BPL); 112 113 mask = 0xff00ff00; 114 f = 0; 115 w = width; 116 if (sx & 15) { 117 f = 1; 118 w += 8; 119 } 120 if ((sx + width) & 15) 121 f |= 2; 122 w >>= 4; 123 for (i = height; i; i--) { 124 src32 = (u32 *)src; 125 dst32 = (u32 *)dst; 126 127 if (f & 1) { 128 pval[0] = (*src32++ << 8) & mask; 129 pval[1] = (*src32++ << 8) & mask; 130 } else { 131 pval[0] = dst32[0] & mask; 132 pval[1] = dst32[1] & mask; 133 } 134 135 for (j = w; j > 0; j--) { 136 v = *src32++; 137 v1 = v & mask; 138 *dst32++ = pval[0] | (v1 >> 8); 139 pval[0] = (v ^ v1) << 8; 140 v = *src32++; 141 v1 = v & mask; 142 *dst32++ = pval[1] | (v1 >> 8); 143 pval[1] = (v ^ v1) << 8; 144 } 145 146 if (f & 2) { 147 dst32[0] = (dst32[0] & mask) | pval[0]; 148 dst32[1] = (dst32[1] & mask) | pval[1]; 149 } 150 151 src += next_line; 152 dst += next_line; 153 } 154 } else { 155 u32 *src32, *dst32; 156 u32 pval[4], v, v1, mask; 157 int i, j, w, f; 158 159 src = (u8 *)info->screen_base + (sy - 1) * next_line + ((sx + width + 8) & ~15) / (8 / BPL); 160 dst = (u8 *)info->screen_base + (dy - 1) * next_line + ((dx + width + 8) & ~15) / (8 / BPL); 161 162 mask = 0xff00ff; 163 f = 0; 164 w = width; 165 if ((dx + width) & 15) 166 f = 1; 167 if (sx & 15) { 168 f |= 2; 169 w += 8; 170 } 171 w >>= 4; 172 for (i = height; i; i--) { 173 src32 = (u32 *)src; 174 dst32 = (u32 *)dst; 175 176 if (f & 1) { 177 pval[0] = dst32[-1] & mask; 178 pval[1] = dst32[-2] & mask; 179 } else { 180 pval[0] = (*--src32 >> 8) & mask; 181 pval[1] = (*--src32 >> 8) & mask; 182 } 183 184 for (j = w; j > 0; j--) { 185 v = *--src32; 186 v1 = v & mask; 187 *--dst32 = pval[0] | (v1 << 8); 188 pval[0] = (v ^ v1) >> 8; 189 v = *--src32; 190 v1 = v & mask; 191 *--dst32 = pval[1] | (v1 << 8); 192 pval[1] = (v ^ v1) >> 8; 193 } 194 195 if (!(f & 2)) { 196 dst32[-1] = (dst32[-1] & mask) | pval[0]; 197 dst32[-2] = (dst32[-2] & mask) | pval[1]; 198 } 199 200 src -= next_line; 201 dst -= next_line; 202 } 203 } 204 } 205 } 206 207 void atafb_iplan2p4_fillrect(struct fb_info *info, u_long next_line, u32 color, 208 int sy, int sx, int height, int width) 209 { 210 u32 *dest; 211 int rows, i; 212 u32 cval[4]; 213 214 dest = (u32 *)(info->screen_base + sy * next_line + (sx & ~15) / (8 / BPL)); 215 if (sx & 15) { 216 u8 *dest8 = (u8 *)dest + 1; 217 218 expand8_col2mask(color, cval); 219 220 for (i = height; i; i--) { 221 fill8_col(dest8, cval); 222 dest8 += next_line; 223 } 224 dest += BPL / 2; 225 width -= 8; 226 } 227 228 expand16_col2mask(color, cval); 229 rows = width >> 4; 230 if (rows) { 231 u32 *d = dest; 232 u32 off = next_line - rows * BPL * 2; 233 for (i = height; i; i--) { 234 d = fill16_col(d, rows, cval); 235 d = (u32 *)((long)d + off); 236 } 237 dest += rows * BPL / 2; 238 width &= 15; 239 } 240 241 if (width) { 242 u8 *dest8 = (u8 *)dest; 243 244 expand8_col2mask(color, cval); 245 246 for (i = height; i; i--) { 247 fill8_col(dest8, cval); 248 dest8 += next_line; 249 } 250 } 251 } 252 253 void atafb_iplan2p4_linefill(struct fb_info *info, u_long next_line, 254 int dy, int dx, u32 width, 255 const u8 *data, u32 bgcolor, u32 fgcolor) 256 { 257 u32 *dest; 258 const u16 *data16; 259 int rows; 260 u32 fgm[4], bgm[4], m; 261 262 dest = (u32 *)(info->screen_base + dy * next_line + (dx & ~15) / (8 / BPL)); 263 if (dx & 15) { 264 fill8_2col((u8 *)dest + 1, fgcolor, bgcolor, *data++); 265 dest += BPL / 2; 266 width -= 8; 267 } 268 269 if (width >= 16) { 270 data16 = (const u16 *)data; 271 expand16_2col2mask(fgcolor, bgcolor, fgm, bgm); 272 273 for (rows = width / 16; rows; rows--) { 274 u16 d = *data16++; 275 m = d | ((u32)d << 16); 276 *dest++ = (m & fgm[0]) ^ bgm[0]; 277 *dest++ = (m & fgm[1]) ^ bgm[1]; 278 } 279 280 data = (const u8 *)data16; 281 width &= 15; 282 } 283 284 if (width) 285 fill8_2col((u8 *)dest, fgcolor, bgcolor, *data); 286 } 287 288 #ifdef MODULE 289 MODULE_LICENSE("GPL"); 290 291 int init_module(void) 292 { 293 return 0; 294 } 295 296 void cleanup_module(void) 297 { 298 } 299 #endif /* MODULE */ 300 301 302 /* 303 * Visible symbols for modules 304 */ 305 306 EXPORT_SYMBOL(atafb_iplan2p4_copyarea); 307 EXPORT_SYMBOL(atafb_iplan2p4_fillrect); 308 EXPORT_SYMBOL(atafb_iplan2p4_linefill); 309