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