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