1 /* 2 * linux/drivers/video/iplan2p2.c -- Low level frame buffer operations for 3 * interleaved bitplanes à la Atari (2 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 2 22 #include "atafb_utils.h" 23 24 void atafb_iplan2p2_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 } else { 130 pval[0] = dst32[0] & mask; 131 } 132 133 for (j = w; j > 0; j--) { 134 v = *src32++; 135 v1 = v & mask; 136 *dst32++ = pval[0] | (v1 >> 8); 137 pval[0] = (v ^ v1) << 8; 138 } 139 140 if (f & 2) { 141 dst32[0] = (dst32[0] & mask) | pval[0]; 142 } 143 144 src += next_line; 145 dst += next_line; 146 } 147 } else { 148 u32 *src32, *dst32; 149 u32 pval[4], v, v1, mask; 150 int i, j, w, f; 151 152 src = (u8 *)info->screen_base + (sy - 1) * next_line + ((sx + width + 8) & ~15) / (8 / BPL); 153 dst = (u8 *)info->screen_base + (dy - 1) * next_line + ((dx + width + 8) & ~15) / (8 / BPL); 154 155 mask = 0xff00ff; 156 f = 0; 157 w = width; 158 if ((dx + width) & 15) 159 f = 1; 160 if (sx & 15) { 161 f |= 2; 162 w += 8; 163 } 164 w >>= 4; 165 for (i = height; i; i--) { 166 src32 = (u32 *)src; 167 dst32 = (u32 *)dst; 168 169 if (f & 1) { 170 pval[0] = dst32[-1] & mask; 171 } else { 172 pval[0] = (*--src32 >> 8) & mask; 173 } 174 175 for (j = w; j > 0; j--) { 176 v = *--src32; 177 v1 = v & mask; 178 *--dst32 = pval[0] | (v1 << 8); 179 pval[0] = (v ^ v1) >> 8; 180 } 181 182 if (!(f & 2)) { 183 dst32[-1] = (dst32[-1] & mask) | pval[0]; 184 } 185 186 src -= next_line; 187 dst -= next_line; 188 } 189 } 190 } 191 } 192 193 void atafb_iplan2p2_fillrect(struct fb_info *info, u_long next_line, u32 color, 194 int sy, int sx, int height, int width) 195 { 196 u32 *dest; 197 int rows, i; 198 u32 cval[4]; 199 200 dest = (u32 *)(info->screen_base + sy * next_line + (sx & ~15) / (8 / BPL)); 201 if (sx & 15) { 202 u8 *dest8 = (u8 *)dest + 1; 203 204 expand8_col2mask(color, cval); 205 206 for (i = height; i; i--) { 207 fill8_col(dest8, cval); 208 dest8 += next_line; 209 } 210 dest += BPL / 2; 211 width -= 8; 212 } 213 214 expand16_col2mask(color, cval); 215 rows = width >> 4; 216 if (rows) { 217 u32 *d = dest; 218 u32 off = next_line - rows * BPL * 2; 219 for (i = height; i; i--) { 220 d = fill16_col(d, rows, cval); 221 d = (u32 *)((long)d + off); 222 } 223 dest += rows * BPL / 2; 224 width &= 15; 225 } 226 227 if (width) { 228 u8 *dest8 = (u8 *)dest; 229 230 expand8_col2mask(color, cval); 231 232 for (i = height; i; i--) { 233 fill8_col(dest8, cval); 234 dest8 += next_line; 235 } 236 } 237 } 238 239 void atafb_iplan2p2_linefill(struct fb_info *info, u_long next_line, 240 int dy, int dx, u32 width, 241 const u8 *data, u32 bgcolor, u32 fgcolor) 242 { 243 u32 *dest; 244 const u16 *data16; 245 int rows; 246 u32 fgm[4], bgm[4], m; 247 248 dest = (u32 *)(info->screen_base + dy * next_line + (dx & ~15) / (8 / BPL)); 249 if (dx & 15) { 250 fill8_2col((u8 *)dest + 1, fgcolor, bgcolor, *data++); 251 dest += BPL / 2; 252 width -= 8; 253 } 254 255 if (width >= 16) { 256 data16 = (const u16 *)data; 257 expand16_2col2mask(fgcolor, bgcolor, fgm, bgm); 258 259 for (rows = width / 16; rows; rows--) { 260 u16 d = *data16++; 261 m = d | ((u32)d << 16); 262 *dest++ = (m & fgm[0]) ^ bgm[0]; 263 } 264 265 data = (const u8 *)data16; 266 width &= 15; 267 } 268 269 if (width) 270 fill8_2col((u8 *)dest, fgcolor, bgcolor, *data); 271 } 272 273 #ifdef MODULE 274 MODULE_LICENSE("GPL"); 275 276 int init_module(void) 277 { 278 return 0; 279 } 280 281 void cleanup_module(void) 282 { 283 } 284 #endif /* MODULE */ 285 286 287 /* 288 * Visible symbols for modules 289 */ 290 291 EXPORT_SYMBOL(atafb_iplan2p2_copyarea); 292 EXPORT_SYMBOL(atafb_iplan2p2_fillrect); 293 EXPORT_SYMBOL(atafb_iplan2p2_linefill); 294