1 /* 2 * framebuffer driver for VBE 2.0 compliant graphic boards 3 * 4 * switching to graphics mode happens at boot time (while 5 * running in real mode, see arch/i386/boot/video.S). 6 * 7 * (c) 1998 Gerd Knorr <kraxel@goldbach.in-berlin.de> 8 * 9 */ 10 11 #include <linux/module.h> 12 #include <linux/kernel.h> 13 #include <linux/errno.h> 14 #include <linux/string.h> 15 #include <linux/mm.h> 16 #include <linux/delay.h> 17 #include <linux/fb.h> 18 #include <linux/ioport.h> 19 #include <linux/init.h> 20 #include <linux/platform_device.h> 21 #include <linux/screen_info.h> 22 23 #include <video/vga.h> 24 #include <asm/io.h> 25 #include <asm/mtrr.h> 26 27 #define dac_reg (0x3c8) 28 #define dac_val (0x3c9) 29 30 /* --------------------------------------------------------------------- */ 31 32 static struct fb_var_screeninfo vesafb_defined = { 33 .activate = FB_ACTIVATE_NOW, 34 .height = -1, 35 .width = -1, 36 .right_margin = 32, 37 .upper_margin = 16, 38 .lower_margin = 4, 39 .vsync_len = 4, 40 .vmode = FB_VMODE_NONINTERLACED, 41 }; 42 43 static struct fb_fix_screeninfo vesafb_fix = { 44 .id = "VESA VGA", 45 .type = FB_TYPE_PACKED_PIXELS, 46 .accel = FB_ACCEL_NONE, 47 }; 48 49 static int inverse __read_mostly; 50 static int mtrr __read_mostly; /* disable mtrr */ 51 static int vram_remap; /* Set amount of memory to be used */ 52 static int vram_total; /* Set total amount of memory */ 53 static int pmi_setpal __read_mostly = 1; /* pmi for palette changes ??? */ 54 static int ypan __read_mostly; /* 0..nothing, 1..ypan, 2..ywrap */ 55 static void (*pmi_start)(void) __read_mostly; 56 static void (*pmi_pal) (void) __read_mostly; 57 static int depth __read_mostly; 58 static int vga_compat __read_mostly; 59 /* --------------------------------------------------------------------- */ 60 61 static int vesafb_pan_display(struct fb_var_screeninfo *var, 62 struct fb_info *info) 63 { 64 #ifdef __i386__ 65 int offset; 66 67 offset = (var->yoffset * info->fix.line_length + var->xoffset) / 4; 68 69 __asm__ __volatile__( 70 "call *(%%edi)" 71 : /* no return value */ 72 : "a" (0x4f07), /* EAX */ 73 "b" (0), /* EBX */ 74 "c" (offset), /* ECX */ 75 "d" (offset >> 16), /* EDX */ 76 "D" (&pmi_start)); /* EDI */ 77 #endif 78 return 0; 79 } 80 81 static int vesa_setpalette(int regno, unsigned red, unsigned green, 82 unsigned blue) 83 { 84 int shift = 16 - depth; 85 int err = -EINVAL; 86 87 /* 88 * Try VGA registers first... 89 */ 90 if (vga_compat) { 91 outb_p(regno, dac_reg); 92 outb_p(red >> shift, dac_val); 93 outb_p(green >> shift, dac_val); 94 outb_p(blue >> shift, dac_val); 95 err = 0; 96 } 97 98 #ifdef __i386__ 99 /* 100 * Fallback to the PMI.... 101 */ 102 if (err && pmi_setpal) { 103 struct { u_char blue, green, red, pad; } entry; 104 105 entry.red = red >> shift; 106 entry.green = green >> shift; 107 entry.blue = blue >> shift; 108 entry.pad = 0; 109 __asm__ __volatile__( 110 "call *(%%esi)" 111 : /* no return value */ 112 : "a" (0x4f09), /* EAX */ 113 "b" (0), /* EBX */ 114 "c" (1), /* ECX */ 115 "d" (regno), /* EDX */ 116 "D" (&entry), /* EDI */ 117 "S" (&pmi_pal)); /* ESI */ 118 err = 0; 119 } 120 #endif 121 122 return err; 123 } 124 125 static int vesafb_setcolreg(unsigned regno, unsigned red, unsigned green, 126 unsigned blue, unsigned transp, 127 struct fb_info *info) 128 { 129 int err = 0; 130 131 /* 132 * Set a single color register. The values supplied are 133 * already rounded down to the hardware's capabilities 134 * (according to the entries in the `var' structure). Return 135 * != 0 for invalid regno. 136 */ 137 138 if (regno >= info->cmap.len) 139 return 1; 140 141 if (info->var.bits_per_pixel == 8) 142 err = vesa_setpalette(regno,red,green,blue); 143 else if (regno < 16) { 144 switch (info->var.bits_per_pixel) { 145 case 16: 146 if (info->var.red.offset == 10) { 147 /* 1:5:5:5 */ 148 ((u32*) (info->pseudo_palette))[regno] = 149 ((red & 0xf800) >> 1) | 150 ((green & 0xf800) >> 6) | 151 ((blue & 0xf800) >> 11); 152 } else { 153 /* 0:5:6:5 */ 154 ((u32*) (info->pseudo_palette))[regno] = 155 ((red & 0xf800) ) | 156 ((green & 0xfc00) >> 5) | 157 ((blue & 0xf800) >> 11); 158 } 159 break; 160 case 24: 161 case 32: 162 red >>= 8; 163 green >>= 8; 164 blue >>= 8; 165 ((u32 *)(info->pseudo_palette))[regno] = 166 (red << info->var.red.offset) | 167 (green << info->var.green.offset) | 168 (blue << info->var.blue.offset); 169 break; 170 } 171 } 172 173 return err; 174 } 175 176 static void vesafb_destroy(struct fb_info *info) 177 { 178 fb_dealloc_cmap(&info->cmap); 179 if (info->screen_base) 180 iounmap(info->screen_base); 181 release_mem_region(info->apertures->ranges[0].base, info->apertures->ranges[0].size); 182 } 183 184 static struct fb_ops vesafb_ops = { 185 .owner = THIS_MODULE, 186 .fb_destroy = vesafb_destroy, 187 .fb_setcolreg = vesafb_setcolreg, 188 .fb_pan_display = vesafb_pan_display, 189 .fb_fillrect = cfb_fillrect, 190 .fb_copyarea = cfb_copyarea, 191 .fb_imageblit = cfb_imageblit, 192 }; 193 194 static int vesafb_setup(char *options) 195 { 196 char *this_opt; 197 198 if (!options || !*options) 199 return 0; 200 201 while ((this_opt = strsep(&options, ",")) != NULL) { 202 if (!*this_opt) continue; 203 204 if (! strcmp(this_opt, "inverse")) 205 inverse=1; 206 else if (! strcmp(this_opt, "redraw")) 207 ypan=0; 208 else if (! strcmp(this_opt, "ypan")) 209 ypan=1; 210 else if (! strcmp(this_opt, "ywrap")) 211 ypan=2; 212 else if (! strcmp(this_opt, "vgapal")) 213 pmi_setpal=0; 214 else if (! strcmp(this_opt, "pmipal")) 215 pmi_setpal=1; 216 else if (! strncmp(this_opt, "mtrr:", 5)) 217 mtrr = simple_strtoul(this_opt+5, NULL, 0); 218 else if (! strcmp(this_opt, "nomtrr")) 219 mtrr=0; 220 else if (! strncmp(this_opt, "vtotal:", 7)) 221 vram_total = simple_strtoul(this_opt+7, NULL, 0); 222 else if (! strncmp(this_opt, "vremap:", 7)) 223 vram_remap = simple_strtoul(this_opt+7, NULL, 0); 224 } 225 return 0; 226 } 227 228 static int vesafb_probe(struct platform_device *dev) 229 { 230 struct fb_info *info; 231 int i, err; 232 unsigned int size_vmode; 233 unsigned int size_remap; 234 unsigned int size_total; 235 char *option = NULL; 236 237 /* ignore error return of fb_get_options */ 238 fb_get_options("vesafb", &option); 239 vesafb_setup(option); 240 241 if (screen_info.orig_video_isVGA != VIDEO_TYPE_VLFB) 242 return -ENODEV; 243 244 vga_compat = (screen_info.capabilities & 2) ? 0 : 1; 245 vesafb_fix.smem_start = screen_info.lfb_base; 246 vesafb_defined.bits_per_pixel = screen_info.lfb_depth; 247 if (15 == vesafb_defined.bits_per_pixel) 248 vesafb_defined.bits_per_pixel = 16; 249 vesafb_defined.xres = screen_info.lfb_width; 250 vesafb_defined.yres = screen_info.lfb_height; 251 vesafb_fix.line_length = screen_info.lfb_linelength; 252 vesafb_fix.visual = (vesafb_defined.bits_per_pixel == 8) ? 253 FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_TRUECOLOR; 254 255 /* size_vmode -- that is the amount of memory needed for the 256 * used video mode, i.e. the minimum amount of 257 * memory we need. */ 258 size_vmode = vesafb_defined.yres * vesafb_fix.line_length; 259 260 /* size_total -- all video memory we have. Used for mtrr 261 * entries, resource allocation and bounds 262 * checking. */ 263 size_total = screen_info.lfb_size * 65536; 264 if (vram_total) 265 size_total = vram_total * 1024 * 1024; 266 if (size_total < size_vmode) 267 size_total = size_vmode; 268 269 /* size_remap -- the amount of video memory we are going to 270 * use for vesafb. With modern cards it is no 271 * option to simply use size_total as that 272 * wastes plenty of kernel address space. */ 273 size_remap = size_vmode * 2; 274 if (vram_remap) 275 size_remap = vram_remap * 1024 * 1024; 276 if (size_remap < size_vmode) 277 size_remap = size_vmode; 278 if (size_remap > size_total) 279 size_remap = size_total; 280 vesafb_fix.smem_len = size_remap; 281 282 #ifndef __i386__ 283 screen_info.vesapm_seg = 0; 284 #endif 285 286 if (!request_mem_region(vesafb_fix.smem_start, size_total, "vesafb")) { 287 printk(KERN_WARNING 288 "vesafb: cannot reserve video memory at 0x%lx\n", 289 vesafb_fix.smem_start); 290 /* We cannot make this fatal. Sometimes this comes from magic 291 spaces our resource handlers simply don't know about */ 292 } 293 294 info = framebuffer_alloc(sizeof(u32) * 256, &dev->dev); 295 if (!info) { 296 release_mem_region(vesafb_fix.smem_start, size_total); 297 return -ENOMEM; 298 } 299 platform_set_drvdata(dev, info); 300 info->pseudo_palette = info->par; 301 info->par = NULL; 302 303 /* set vesafb aperture size for generic probing */ 304 info->apertures = alloc_apertures(1); 305 if (!info->apertures) { 306 err = -ENOMEM; 307 goto err; 308 } 309 info->apertures->ranges[0].base = screen_info.lfb_base; 310 info->apertures->ranges[0].size = size_total; 311 312 printk(KERN_INFO "vesafb: mode is %dx%dx%d, linelength=%d, pages=%d\n", 313 vesafb_defined.xres, vesafb_defined.yres, vesafb_defined.bits_per_pixel, vesafb_fix.line_length, screen_info.pages); 314 315 if (screen_info.vesapm_seg) { 316 printk(KERN_INFO "vesafb: protected mode interface info at %04x:%04x\n", 317 screen_info.vesapm_seg,screen_info.vesapm_off); 318 } 319 320 if (screen_info.vesapm_seg < 0xc000) 321 ypan = pmi_setpal = 0; /* not available or some DOS TSR ... */ 322 323 if (ypan || pmi_setpal) { 324 unsigned short *pmi_base; 325 pmi_base = (unsigned short*)phys_to_virt(((unsigned long)screen_info.vesapm_seg << 4) + screen_info.vesapm_off); 326 pmi_start = (void*)((char*)pmi_base + pmi_base[1]); 327 pmi_pal = (void*)((char*)pmi_base + pmi_base[2]); 328 printk(KERN_INFO "vesafb: pmi: set display start = %p, set palette = %p\n",pmi_start,pmi_pal); 329 if (pmi_base[3]) { 330 printk(KERN_INFO "vesafb: pmi: ports = "); 331 for (i = pmi_base[3]/2; pmi_base[i] != 0xffff; i++) 332 printk("%x ",pmi_base[i]); 333 printk("\n"); 334 if (pmi_base[i] != 0xffff) { 335 /* 336 * memory areas not supported (yet?) 337 * 338 * Rules are: we have to set up a descriptor for the requested 339 * memory area and pass it in the ES register to the BIOS function. 340 */ 341 printk(KERN_INFO "vesafb: can't handle memory requests, pmi disabled\n"); 342 ypan = pmi_setpal = 0; 343 } 344 } 345 } 346 347 if (vesafb_defined.bits_per_pixel == 8 && !pmi_setpal && !vga_compat) { 348 printk(KERN_WARNING "vesafb: hardware palette is unchangeable,\n" 349 " colors may be incorrect\n"); 350 vesafb_fix.visual = FB_VISUAL_STATIC_PSEUDOCOLOR; 351 } 352 353 vesafb_defined.xres_virtual = vesafb_defined.xres; 354 vesafb_defined.yres_virtual = vesafb_fix.smem_len / vesafb_fix.line_length; 355 if (ypan && vesafb_defined.yres_virtual > vesafb_defined.yres) { 356 printk(KERN_INFO "vesafb: scrolling: %s using protected mode interface, yres_virtual=%d\n", 357 (ypan > 1) ? "ywrap" : "ypan",vesafb_defined.yres_virtual); 358 } else { 359 printk(KERN_INFO "vesafb: scrolling: redraw\n"); 360 vesafb_defined.yres_virtual = vesafb_defined.yres; 361 ypan = 0; 362 } 363 364 /* some dummy values for timing to make fbset happy */ 365 vesafb_defined.pixclock = 10000000 / vesafb_defined.xres * 1000 / vesafb_defined.yres; 366 vesafb_defined.left_margin = (vesafb_defined.xres / 8) & 0xf8; 367 vesafb_defined.hsync_len = (vesafb_defined.xres / 8) & 0xf8; 368 369 vesafb_defined.red.offset = screen_info.red_pos; 370 vesafb_defined.red.length = screen_info.red_size; 371 vesafb_defined.green.offset = screen_info.green_pos; 372 vesafb_defined.green.length = screen_info.green_size; 373 vesafb_defined.blue.offset = screen_info.blue_pos; 374 vesafb_defined.blue.length = screen_info.blue_size; 375 vesafb_defined.transp.offset = screen_info.rsvd_pos; 376 vesafb_defined.transp.length = screen_info.rsvd_size; 377 378 if (vesafb_defined.bits_per_pixel <= 8) { 379 depth = vesafb_defined.green.length; 380 vesafb_defined.red.length = 381 vesafb_defined.green.length = 382 vesafb_defined.blue.length = 383 vesafb_defined.bits_per_pixel; 384 } 385 386 printk(KERN_INFO "vesafb: %s: " 387 "size=%d:%d:%d:%d, shift=%d:%d:%d:%d\n", 388 (vesafb_defined.bits_per_pixel > 8) ? 389 "Truecolor" : (vga_compat || pmi_setpal) ? 390 "Pseudocolor" : "Static Pseudocolor", 391 screen_info.rsvd_size, 392 screen_info.red_size, 393 screen_info.green_size, 394 screen_info.blue_size, 395 screen_info.rsvd_pos, 396 screen_info.red_pos, 397 screen_info.green_pos, 398 screen_info.blue_pos); 399 400 vesafb_fix.ypanstep = ypan ? 1 : 0; 401 vesafb_fix.ywrapstep = (ypan>1) ? 1 : 0; 402 403 /* request failure does not faze us, as vgacon probably has this 404 * region already (FIXME) */ 405 request_region(0x3c0, 32, "vesafb"); 406 407 #ifdef CONFIG_MTRR 408 if (mtrr) { 409 unsigned int temp_size = size_total; 410 unsigned int type = 0; 411 412 switch (mtrr) { 413 case 1: 414 type = MTRR_TYPE_UNCACHABLE; 415 break; 416 case 2: 417 type = MTRR_TYPE_WRBACK; 418 break; 419 case 3: 420 type = MTRR_TYPE_WRCOMB; 421 break; 422 case 4: 423 type = MTRR_TYPE_WRTHROUGH; 424 break; 425 default: 426 type = 0; 427 break; 428 } 429 430 if (type) { 431 int rc; 432 433 /* Find the largest power-of-two */ 434 temp_size = roundup_pow_of_two(temp_size); 435 436 /* Try and find a power of two to add */ 437 do { 438 rc = mtrr_add(vesafb_fix.smem_start, temp_size, 439 type, 1); 440 temp_size >>= 1; 441 } while (temp_size >= PAGE_SIZE && rc == -EINVAL); 442 } 443 } 444 #endif 445 446 switch (mtrr) { 447 case 1: /* uncachable */ 448 info->screen_base = ioremap_nocache(vesafb_fix.smem_start, vesafb_fix.smem_len); 449 break; 450 case 2: /* write-back */ 451 info->screen_base = ioremap_cache(vesafb_fix.smem_start, vesafb_fix.smem_len); 452 break; 453 case 3: /* write-combining */ 454 info->screen_base = ioremap_wc(vesafb_fix.smem_start, vesafb_fix.smem_len); 455 break; 456 case 4: /* write-through */ 457 default: 458 info->screen_base = ioremap(vesafb_fix.smem_start, vesafb_fix.smem_len); 459 break; 460 } 461 if (!info->screen_base) { 462 printk(KERN_ERR 463 "vesafb: abort, cannot ioremap video memory 0x%x @ 0x%lx\n", 464 vesafb_fix.smem_len, vesafb_fix.smem_start); 465 err = -EIO; 466 goto err; 467 } 468 469 printk(KERN_INFO "vesafb: framebuffer at 0x%lx, mapped to 0x%p, " 470 "using %dk, total %dk\n", 471 vesafb_fix.smem_start, info->screen_base, 472 size_remap/1024, size_total/1024); 473 474 info->fbops = &vesafb_ops; 475 info->var = vesafb_defined; 476 info->fix = vesafb_fix; 477 info->flags = FBINFO_FLAG_DEFAULT | FBINFO_MISC_FIRMWARE | 478 (ypan ? FBINFO_HWACCEL_YPAN : 0); 479 480 if (!ypan) 481 info->fbops->fb_pan_display = NULL; 482 483 if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) { 484 err = -ENOMEM; 485 goto err; 486 } 487 if (register_framebuffer(info)<0) { 488 err = -EINVAL; 489 fb_dealloc_cmap(&info->cmap); 490 goto err; 491 } 492 fb_info(info, "%s frame buffer device\n", info->fix.id); 493 return 0; 494 err: 495 if (info->screen_base) 496 iounmap(info->screen_base); 497 framebuffer_release(info); 498 release_mem_region(vesafb_fix.smem_start, size_total); 499 return err; 500 } 501 502 static int vesafb_remove(struct platform_device *pdev) 503 { 504 struct fb_info *info = platform_get_drvdata(pdev); 505 506 unregister_framebuffer(info); 507 framebuffer_release(info); 508 509 return 0; 510 } 511 512 static struct platform_driver vesafb_driver = { 513 .driver = { 514 .name = "vesa-framebuffer", 515 }, 516 .probe = vesafb_probe, 517 .remove = vesafb_remove, 518 }; 519 520 module_platform_driver(vesafb_driver); 521 MODULE_LICENSE("GPL"); 522