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