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/aperture.h> 13 #include <linux/module.h> 14 #include <linux/kernel.h> 15 #include <linux/errno.h> 16 #include <linux/string.h> 17 #include <linux/mm.h> 18 #include <linux/delay.h> 19 #include <linux/fb.h> 20 #include <linux/ioport.h> 21 #include <linux/init.h> 22 #include <linux/platform_device.h> 23 #include <linux/screen_info.h> 24 #include <linux/io.h> 25 26 #include <video/vga.h> 27 28 #define dac_reg (0x3c8) 29 #define dac_val (0x3c9) 30 31 /* --------------------------------------------------------------------- */ 32 33 struct vesafb_par { 34 u32 pseudo_palette[256]; 35 resource_size_t base; 36 resource_size_t size; 37 int wc_cookie; 38 struct resource *region; 39 }; 40 41 static struct fb_var_screeninfo vesafb_defined = { 42 .activate = FB_ACTIVATE_NOW, 43 .height = -1, 44 .width = -1, 45 .right_margin = 32, 46 .upper_margin = 16, 47 .lower_margin = 4, 48 .vsync_len = 4, 49 .vmode = FB_VMODE_NONINTERLACED, 50 }; 51 52 static struct fb_fix_screeninfo vesafb_fix = { 53 .id = "VESA VGA", 54 .type = FB_TYPE_PACKED_PIXELS, 55 .accel = FB_ACCEL_NONE, 56 }; 57 58 static int inverse __read_mostly; 59 static int mtrr __read_mostly; /* disable mtrr */ 60 static int vram_remap; /* Set amount of memory to be used */ 61 static int vram_total; /* Set total amount of memory */ 62 static int pmi_setpal __read_mostly = 1; /* pmi for palette changes ??? */ 63 static int ypan __read_mostly; /* 0..nothing, 1..ypan, 2..ywrap */ 64 static void (*pmi_start)(void) __read_mostly; 65 static void (*pmi_pal) (void) __read_mostly; 66 static int depth __read_mostly; 67 static int vga_compat __read_mostly; 68 /* --------------------------------------------------------------------- */ 69 70 static int vesafb_pan_display(struct fb_var_screeninfo *var, 71 struct fb_info *info) 72 { 73 #ifdef __i386__ 74 int offset; 75 76 offset = (var->yoffset * info->fix.line_length + var->xoffset) / 4; 77 78 __asm__ __volatile__( 79 "call *(%%edi)" 80 : /* no return value */ 81 : "a" (0x4f07), /* EAX */ 82 "b" (0), /* EBX */ 83 "c" (offset), /* ECX */ 84 "d" (offset >> 16), /* EDX */ 85 "D" (&pmi_start)); /* EDI */ 86 #endif 87 return 0; 88 } 89 90 static int vesa_setpalette(int regno, unsigned red, unsigned green, 91 unsigned blue) 92 { 93 int shift = 16 - depth; 94 int err = -EINVAL; 95 96 /* 97 * Try VGA registers first... 98 */ 99 if (vga_compat) { 100 outb_p(regno, dac_reg); 101 outb_p(red >> shift, dac_val); 102 outb_p(green >> shift, dac_val); 103 outb_p(blue >> shift, dac_val); 104 err = 0; 105 } 106 107 #ifdef __i386__ 108 /* 109 * Fallback to the PMI.... 110 */ 111 if (err && pmi_setpal) { 112 struct { u_char blue, green, red, pad; } entry; 113 114 entry.red = red >> shift; 115 entry.green = green >> shift; 116 entry.blue = blue >> shift; 117 entry.pad = 0; 118 __asm__ __volatile__( 119 "call *(%%esi)" 120 : /* no return value */ 121 : "a" (0x4f09), /* EAX */ 122 "b" (0), /* EBX */ 123 "c" (1), /* ECX */ 124 "d" (regno), /* EDX */ 125 "D" (&entry), /* EDI */ 126 "S" (&pmi_pal)); /* ESI */ 127 err = 0; 128 } 129 #endif 130 131 return err; 132 } 133 134 static int vesafb_setcolreg(unsigned regno, unsigned red, unsigned green, 135 unsigned blue, unsigned transp, 136 struct fb_info *info) 137 { 138 int err = 0; 139 140 /* 141 * Set a single color register. The values supplied are 142 * already rounded down to the hardware's capabilities 143 * (according to the entries in the `var' structure). Return 144 * != 0 for invalid regno. 145 */ 146 147 if (regno >= info->cmap.len) 148 return 1; 149 150 if (info->var.bits_per_pixel == 8) 151 err = vesa_setpalette(regno,red,green,blue); 152 else if (regno < 16) { 153 switch (info->var.bits_per_pixel) { 154 case 16: 155 if (info->var.red.offset == 10) { 156 /* 1:5:5:5 */ 157 ((u32*) (info->pseudo_palette))[regno] = 158 ((red & 0xf800) >> 1) | 159 ((green & 0xf800) >> 6) | 160 ((blue & 0xf800) >> 11); 161 } else { 162 /* 0:5:6:5 */ 163 ((u32*) (info->pseudo_palette))[regno] = 164 ((red & 0xf800) ) | 165 ((green & 0xfc00) >> 5) | 166 ((blue & 0xf800) >> 11); 167 } 168 break; 169 case 24: 170 case 32: 171 red >>= 8; 172 green >>= 8; 173 blue >>= 8; 174 ((u32 *)(info->pseudo_palette))[regno] = 175 (red << info->var.red.offset) | 176 (green << info->var.green.offset) | 177 (blue << info->var.blue.offset); 178 break; 179 } 180 } 181 182 return err; 183 } 184 185 /* 186 * fb_ops.fb_destroy is called by the last put_fb_info() call at the end 187 * of unregister_framebuffer() or fb_release(). Do any cleanup here. 188 */ 189 static void vesafb_destroy(struct fb_info *info) 190 { 191 struct vesafb_par *par = info->par; 192 193 fb_dealloc_cmap(&info->cmap); 194 arch_phys_wc_del(par->wc_cookie); 195 if (info->screen_base) 196 iounmap(info->screen_base); 197 release_mem_region(par->base, par->size); 198 199 framebuffer_release(info); 200 } 201 202 static struct fb_ops vesafb_ops = { 203 .owner = THIS_MODULE, 204 FB_DEFAULT_IOMEM_OPS, 205 .fb_destroy = vesafb_destroy, 206 .fb_setcolreg = vesafb_setcolreg, 207 .fb_pan_display = vesafb_pan_display, 208 }; 209 210 static int vesafb_setup(char *options) 211 { 212 char *this_opt; 213 214 if (!options || !*options) 215 return 0; 216 217 while ((this_opt = strsep(&options, ",")) != NULL) { 218 if (!*this_opt) continue; 219 220 if (! strcmp(this_opt, "inverse")) 221 inverse=1; 222 else if (! strcmp(this_opt, "redraw")) 223 ypan=0; 224 else if (! strcmp(this_opt, "ypan")) 225 ypan=1; 226 else if (! strcmp(this_opt, "ywrap")) 227 ypan=2; 228 else if (! strcmp(this_opt, "vgapal")) 229 pmi_setpal=0; 230 else if (! strcmp(this_opt, "pmipal")) 231 pmi_setpal=1; 232 else if (! strncmp(this_opt, "mtrr:", 5)) 233 mtrr = simple_strtoul(this_opt+5, NULL, 0); 234 else if (! strcmp(this_opt, "nomtrr")) 235 mtrr=0; 236 else if (! strncmp(this_opt, "vtotal:", 7)) 237 vram_total = simple_strtoul(this_opt+7, NULL, 0); 238 else if (! strncmp(this_opt, "vremap:", 7)) 239 vram_remap = simple_strtoul(this_opt+7, NULL, 0); 240 } 241 return 0; 242 } 243 244 static int vesafb_probe(struct platform_device *dev) 245 { 246 struct screen_info *si; 247 struct fb_info *info; 248 struct vesafb_par *par; 249 int i, err; 250 unsigned int size_vmode; 251 unsigned int size_remap; 252 unsigned int size_total; 253 char *option = NULL; 254 255 /* 256 * If we fail probing the device, the kernel might try a different 257 * driver. We get a copy of the attached screen_info, so that we can 258 * modify its values without affecting later drivers. 259 */ 260 si = dev_get_platdata(&dev->dev); 261 if (!si) 262 return -ENODEV; 263 si = devm_kmemdup(&dev->dev, si, sizeof(*si), GFP_KERNEL); 264 if (!si) 265 return -ENOMEM; 266 267 /* ignore error return of fb_get_options */ 268 fb_get_options("vesafb", &option); 269 vesafb_setup(option); 270 271 if (si->orig_video_isVGA != VIDEO_TYPE_VLFB) 272 return -ENODEV; 273 274 vga_compat = !__screen_info_vbe_mode_nonvga(si); 275 vesafb_fix.smem_start = si->lfb_base; 276 vesafb_defined.bits_per_pixel = si->lfb_depth; 277 if (15 == vesafb_defined.bits_per_pixel) 278 vesafb_defined.bits_per_pixel = 16; 279 vesafb_defined.xres = si->lfb_width; 280 vesafb_defined.yres = si->lfb_height; 281 vesafb_fix.line_length = si->lfb_linelength; 282 vesafb_fix.visual = (vesafb_defined.bits_per_pixel == 8) ? 283 FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_TRUECOLOR; 284 285 /* size_vmode -- that is the amount of memory needed for the 286 * used video mode, i.e. the minimum amount of 287 * memory we need. */ 288 size_vmode = vesafb_defined.yres * vesafb_fix.line_length; 289 290 /* size_total -- all video memory we have. Used for mtrr 291 * entries, resource allocation and bounds 292 * checking. */ 293 size_total = si->lfb_size * 65536; 294 if (vram_total) 295 size_total = vram_total * 1024 * 1024; 296 if (size_total < size_vmode) 297 size_total = size_vmode; 298 299 /* size_remap -- the amount of video memory we are going to 300 * use for vesafb. With modern cards it is no 301 * option to simply use size_total as that 302 * wastes plenty of kernel address space. */ 303 size_remap = size_vmode * 2; 304 if (vram_remap) 305 size_remap = vram_remap * 1024 * 1024; 306 if (size_remap < size_vmode) 307 size_remap = size_vmode; 308 if (size_remap > size_total) 309 size_remap = size_total; 310 vesafb_fix.smem_len = size_remap; 311 312 #ifndef __i386__ 313 si->vesapm_seg = 0; 314 #endif 315 316 if (!request_mem_region(vesafb_fix.smem_start, size_total, "vesafb")) { 317 dev_warn(&dev->dev, 318 "cannot reserve video memory at 0x%lx\n", 319 vesafb_fix.smem_start); 320 /* We cannot make this fatal. Sometimes this comes from magic 321 spaces our resource handlers simply don't know about */ 322 } 323 324 info = framebuffer_alloc(sizeof(struct vesafb_par), &dev->dev); 325 if (!info) { 326 release_mem_region(vesafb_fix.smem_start, size_total); 327 return -ENOMEM; 328 } 329 platform_set_drvdata(dev, info); 330 par = info->par; 331 info->pseudo_palette = par->pseudo_palette; 332 333 par->base = si->lfb_base; 334 par->size = size_total; 335 336 dev_info(&dev->dev, "mode is %dx%dx%d, linelength=%d, pages=%d\n", 337 vesafb_defined.xres, vesafb_defined.yres, vesafb_defined.bits_per_pixel, 338 vesafb_fix.line_length, si->pages); 339 340 if (si->vesapm_seg) { 341 dev_info(&dev->dev, "protected mode interface info at %04x:%04x\n", 342 si->vesapm_seg, si->vesapm_off); 343 } 344 345 if (si->vesapm_seg < 0xc000) 346 ypan = pmi_setpal = 0; /* not available or some DOS TSR ... */ 347 348 if (ypan || pmi_setpal) { 349 unsigned long pmi_phys; 350 unsigned short *pmi_base; 351 pmi_phys = ((unsigned long)si->vesapm_seg << 4) + si->vesapm_off; 352 pmi_base = (unsigned short *)phys_to_virt(pmi_phys); 353 pmi_start = (void*)((char*)pmi_base + pmi_base[1]); 354 pmi_pal = (void*)((char*)pmi_base + pmi_base[2]); 355 dev_info(&dev->dev, "pmi: set display start = %p, set palette = %p\n", 356 pmi_start, pmi_pal); 357 if (pmi_base[3]) { 358 dev_info(&dev->dev, "pmi: ports = "); 359 for (i = pmi_base[3]/2; pmi_base[i] != 0xffff; i++) 360 printk("%x ", pmi_base[i]); 361 printk("\n"); 362 if (pmi_base[i] != 0xffff) { 363 /* 364 * memory areas not supported (yet?) 365 * 366 * Rules are: we have to set up a descriptor for the requested 367 * memory area and pass it in the ES register to the BIOS function. 368 */ 369 dev_info(&dev->dev, "can't handle memory requests, pmi disabled\n"); 370 ypan = pmi_setpal = 0; 371 } 372 } 373 } 374 375 if (vesafb_defined.bits_per_pixel == 8 && !pmi_setpal && !vga_compat) { 376 dev_warn(&dev->dev, "hardware palette is unchangeable,\n" 377 " colors may be incorrect\n"); 378 vesafb_fix.visual = FB_VISUAL_STATIC_PSEUDOCOLOR; 379 } 380 381 vesafb_defined.xres_virtual = vesafb_defined.xres; 382 vesafb_defined.yres_virtual = vesafb_fix.smem_len / vesafb_fix.line_length; 383 if (ypan && vesafb_defined.yres_virtual > vesafb_defined.yres) { 384 dev_info(&dev->dev, "scrolling: %s using protected mode interface, yres_virtual=%d\n", 385 (ypan > 1) ? "ywrap" : "ypan",vesafb_defined.yres_virtual); 386 } else { 387 dev_info(&dev->dev, "scrolling: redraw\n"); 388 vesafb_defined.yres_virtual = vesafb_defined.yres; 389 ypan = 0; 390 } 391 392 /* some dummy values for timing to make fbset happy */ 393 vesafb_defined.pixclock = 10000000 / vesafb_defined.xres * 1000 / vesafb_defined.yres; 394 vesafb_defined.left_margin = (vesafb_defined.xres / 8) & 0xf8; 395 vesafb_defined.hsync_len = (vesafb_defined.xres / 8) & 0xf8; 396 397 vesafb_defined.red.offset = si->red_pos; 398 vesafb_defined.red.length = si->red_size; 399 vesafb_defined.green.offset = si->green_pos; 400 vesafb_defined.green.length = si->green_size; 401 vesafb_defined.blue.offset = si->blue_pos; 402 vesafb_defined.blue.length = si->blue_size; 403 vesafb_defined.transp.offset = si->rsvd_pos; 404 vesafb_defined.transp.length = si->rsvd_size; 405 406 if (vesafb_defined.bits_per_pixel <= 8) { 407 depth = vesafb_defined.green.length; 408 vesafb_defined.red.length = 409 vesafb_defined.green.length = 410 vesafb_defined.blue.length = 411 vesafb_defined.bits_per_pixel; 412 } 413 414 dev_info(&dev->dev, "%s: " 415 "size=%d:%d:%d:%d, shift=%d:%d:%d:%d\n", 416 (vesafb_defined.bits_per_pixel > 8) ? 417 "Truecolor" : (vga_compat || pmi_setpal) ? 418 "Pseudocolor" : "Static Pseudocolor", 419 si->rsvd_size, 420 si->red_size, 421 si->green_size, 422 si->blue_size, 423 si->rsvd_pos, 424 si->red_pos, 425 si->green_pos, 426 si->blue_pos); 427 428 vesafb_fix.ypanstep = ypan ? 1 : 0; 429 vesafb_fix.ywrapstep = (ypan>1) ? 1 : 0; 430 431 /* request failure does not faze us, as vgacon probably has this 432 * region already (FIXME) */ 433 par->region = request_region(0x3c0, 32, "vesafb"); 434 435 if (mtrr == 3) { 436 unsigned int temp_size = size_total; 437 438 /* Find the largest power-of-two */ 439 temp_size = roundup_pow_of_two(temp_size); 440 441 /* Try and find a power of two to add */ 442 do { 443 par->wc_cookie = 444 arch_phys_wc_add(vesafb_fix.smem_start, 445 temp_size); 446 temp_size >>= 1; 447 } while (temp_size >= PAGE_SIZE && par->wc_cookie < 0); 448 449 info->screen_base = ioremap_wc(vesafb_fix.smem_start, vesafb_fix.smem_len); 450 } else { 451 if (mtrr && mtrr != 3) 452 WARN_ONCE(1, "Only MTRR_TYPE_WRCOMB (3) make sense\n"); 453 info->screen_base = ioremap(vesafb_fix.smem_start, vesafb_fix.smem_len); 454 } 455 456 if (!info->screen_base) { 457 dev_err(&dev->dev, 458 "abort, cannot ioremap video memory 0x%x @ 0x%lx\n", 459 vesafb_fix.smem_len, vesafb_fix.smem_start); 460 err = -EIO; 461 goto err_release_region; 462 } 463 464 dev_info(&dev->dev, "framebuffer at 0x%lx, mapped to 0x%p, " 465 "using %dk, total %dk\n", 466 vesafb_fix.smem_start, info->screen_base, 467 size_remap/1024, size_total/1024); 468 469 if (!ypan) 470 vesafb_ops.fb_pan_display = NULL; 471 472 info->fbops = &vesafb_ops; 473 info->var = vesafb_defined; 474 info->fix = vesafb_fix; 475 info->flags = (ypan ? FBINFO_HWACCEL_YPAN : 0); 476 477 if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) { 478 err = -ENOMEM; 479 goto err_release_region; 480 } 481 err = devm_aperture_acquire_for_platform_device(dev, par->base, par->size); 482 if (err) 483 goto err_fb_dealloc_cmap; 484 if (register_framebuffer(info)<0) { 485 err = -EINVAL; 486 goto err_fb_dealloc_cmap; 487 } 488 fb_info(info, "%s frame buffer device\n", info->fix.id); 489 return 0; 490 err_fb_dealloc_cmap: 491 fb_dealloc_cmap(&info->cmap); 492 err_release_region: 493 arch_phys_wc_del(par->wc_cookie); 494 if (info->screen_base) 495 iounmap(info->screen_base); 496 if (par->region) 497 release_region(0x3c0, 32); 498 framebuffer_release(info); 499 release_mem_region(vesafb_fix.smem_start, size_total); 500 return err; 501 } 502 503 static void vesafb_remove(struct platform_device *pdev) 504 { 505 struct fb_info *info = platform_get_drvdata(pdev); 506 507 if (((struct vesafb_par *)(info->par))->region) 508 release_region(0x3c0, 32); 509 510 /* vesafb_destroy takes care of info cleanup */ 511 unregister_framebuffer(info); 512 } 513 514 static struct platform_driver vesafb_driver = { 515 .driver = { 516 .name = "vesa-framebuffer", 517 }, 518 .probe = vesafb_probe, 519 .remove = vesafb_remove, 520 }; 521 522 module_platform_driver(vesafb_driver); 523 MODULE_LICENSE("GPL"); 524