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 = &screen_info; 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 /* ignore error return of fb_get_options */ 256 fb_get_options("vesafb", &option); 257 vesafb_setup(option); 258 259 if (si->orig_video_isVGA != VIDEO_TYPE_VLFB) 260 return -ENODEV; 261 262 vga_compat = !__screen_info_vbe_mode_nonvga(si); 263 vesafb_fix.smem_start = si->lfb_base; 264 vesafb_defined.bits_per_pixel = si->lfb_depth; 265 if (15 == vesafb_defined.bits_per_pixel) 266 vesafb_defined.bits_per_pixel = 16; 267 vesafb_defined.xres = si->lfb_width; 268 vesafb_defined.yres = si->lfb_height; 269 vesafb_fix.line_length = si->lfb_linelength; 270 vesafb_fix.visual = (vesafb_defined.bits_per_pixel == 8) ? 271 FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_TRUECOLOR; 272 273 /* size_vmode -- that is the amount of memory needed for the 274 * used video mode, i.e. the minimum amount of 275 * memory we need. */ 276 size_vmode = vesafb_defined.yres * vesafb_fix.line_length; 277 278 /* size_total -- all video memory we have. Used for mtrr 279 * entries, resource allocation and bounds 280 * checking. */ 281 size_total = si->lfb_size * 65536; 282 if (vram_total) 283 size_total = vram_total * 1024 * 1024; 284 if (size_total < size_vmode) 285 size_total = size_vmode; 286 287 /* size_remap -- the amount of video memory we are going to 288 * use for vesafb. With modern cards it is no 289 * option to simply use size_total as that 290 * wastes plenty of kernel address space. */ 291 size_remap = size_vmode * 2; 292 if (vram_remap) 293 size_remap = vram_remap * 1024 * 1024; 294 if (size_remap < size_vmode) 295 size_remap = size_vmode; 296 if (size_remap > size_total) 297 size_remap = size_total; 298 vesafb_fix.smem_len = size_remap; 299 300 #ifndef __i386__ 301 si->vesapm_seg = 0; 302 #endif 303 304 if (!request_mem_region(vesafb_fix.smem_start, size_total, "vesafb")) { 305 printk(KERN_WARNING 306 "vesafb: cannot reserve video memory at 0x%lx\n", 307 vesafb_fix.smem_start); 308 /* We cannot make this fatal. Sometimes this comes from magic 309 spaces our resource handlers simply don't know about */ 310 } 311 312 info = framebuffer_alloc(sizeof(struct vesafb_par), &dev->dev); 313 if (!info) { 314 release_mem_region(vesafb_fix.smem_start, size_total); 315 return -ENOMEM; 316 } 317 platform_set_drvdata(dev, info); 318 par = info->par; 319 info->pseudo_palette = par->pseudo_palette; 320 321 par->base = si->lfb_base; 322 par->size = size_total; 323 324 printk(KERN_INFO "vesafb: mode is %dx%dx%d, linelength=%d, pages=%d\n", 325 vesafb_defined.xres, vesafb_defined.yres, vesafb_defined.bits_per_pixel, 326 vesafb_fix.line_length, si->pages); 327 328 if (si->vesapm_seg) { 329 printk(KERN_INFO "vesafb: protected mode interface info at %04x:%04x\n", 330 si->vesapm_seg, si->vesapm_off); 331 } 332 333 if (si->vesapm_seg < 0xc000) 334 ypan = pmi_setpal = 0; /* not available or some DOS TSR ... */ 335 336 if (ypan || pmi_setpal) { 337 unsigned long pmi_phys; 338 unsigned short *pmi_base; 339 pmi_phys = ((unsigned long)si->vesapm_seg << 4) + si->vesapm_off; 340 pmi_base = (unsigned short *)phys_to_virt(pmi_phys); 341 pmi_start = (void*)((char*)pmi_base + pmi_base[1]); 342 pmi_pal = (void*)((char*)pmi_base + pmi_base[2]); 343 printk(KERN_INFO "vesafb: pmi: set display start = %p, set palette = %p\n",pmi_start,pmi_pal); 344 if (pmi_base[3]) { 345 printk(KERN_INFO "vesafb: pmi: ports = "); 346 for (i = pmi_base[3]/2; pmi_base[i] != 0xffff; i++) 347 printk("%x ", pmi_base[i]); 348 printk("\n"); 349 if (pmi_base[i] != 0xffff) { 350 /* 351 * memory areas not supported (yet?) 352 * 353 * Rules are: we have to set up a descriptor for the requested 354 * memory area and pass it in the ES register to the BIOS function. 355 */ 356 printk(KERN_INFO "vesafb: can't handle memory requests, pmi disabled\n"); 357 ypan = pmi_setpal = 0; 358 } 359 } 360 } 361 362 if (vesafb_defined.bits_per_pixel == 8 && !pmi_setpal && !vga_compat) { 363 printk(KERN_WARNING "vesafb: hardware palette is unchangeable,\n" 364 " colors may be incorrect\n"); 365 vesafb_fix.visual = FB_VISUAL_STATIC_PSEUDOCOLOR; 366 } 367 368 vesafb_defined.xres_virtual = vesafb_defined.xres; 369 vesafb_defined.yres_virtual = vesafb_fix.smem_len / vesafb_fix.line_length; 370 if (ypan && vesafb_defined.yres_virtual > vesafb_defined.yres) { 371 printk(KERN_INFO "vesafb: scrolling: %s using protected mode interface, yres_virtual=%d\n", 372 (ypan > 1) ? "ywrap" : "ypan",vesafb_defined.yres_virtual); 373 } else { 374 printk(KERN_INFO "vesafb: scrolling: redraw\n"); 375 vesafb_defined.yres_virtual = vesafb_defined.yres; 376 ypan = 0; 377 } 378 379 /* some dummy values for timing to make fbset happy */ 380 vesafb_defined.pixclock = 10000000 / vesafb_defined.xres * 1000 / vesafb_defined.yres; 381 vesafb_defined.left_margin = (vesafb_defined.xres / 8) & 0xf8; 382 vesafb_defined.hsync_len = (vesafb_defined.xres / 8) & 0xf8; 383 384 vesafb_defined.red.offset = si->red_pos; 385 vesafb_defined.red.length = si->red_size; 386 vesafb_defined.green.offset = si->green_pos; 387 vesafb_defined.green.length = si->green_size; 388 vesafb_defined.blue.offset = si->blue_pos; 389 vesafb_defined.blue.length = si->blue_size; 390 vesafb_defined.transp.offset = si->rsvd_pos; 391 vesafb_defined.transp.length = si->rsvd_size; 392 393 if (vesafb_defined.bits_per_pixel <= 8) { 394 depth = vesafb_defined.green.length; 395 vesafb_defined.red.length = 396 vesafb_defined.green.length = 397 vesafb_defined.blue.length = 398 vesafb_defined.bits_per_pixel; 399 } 400 401 printk(KERN_INFO "vesafb: %s: " 402 "size=%d:%d:%d:%d, shift=%d:%d:%d:%d\n", 403 (vesafb_defined.bits_per_pixel > 8) ? 404 "Truecolor" : (vga_compat || pmi_setpal) ? 405 "Pseudocolor" : "Static Pseudocolor", 406 si->rsvd_size, 407 si->red_size, 408 si->green_size, 409 si->blue_size, 410 si->rsvd_pos, 411 si->red_pos, 412 si->green_pos, 413 si->blue_pos); 414 415 vesafb_fix.ypanstep = ypan ? 1 : 0; 416 vesafb_fix.ywrapstep = (ypan>1) ? 1 : 0; 417 418 /* request failure does not faze us, as vgacon probably has this 419 * region already (FIXME) */ 420 par->region = request_region(0x3c0, 32, "vesafb"); 421 422 if (mtrr == 3) { 423 unsigned int temp_size = size_total; 424 425 /* Find the largest power-of-two */ 426 temp_size = roundup_pow_of_two(temp_size); 427 428 /* Try and find a power of two to add */ 429 do { 430 par->wc_cookie = 431 arch_phys_wc_add(vesafb_fix.smem_start, 432 temp_size); 433 temp_size >>= 1; 434 } while (temp_size >= PAGE_SIZE && par->wc_cookie < 0); 435 436 info->screen_base = ioremap_wc(vesafb_fix.smem_start, vesafb_fix.smem_len); 437 } else { 438 if (mtrr && mtrr != 3) 439 WARN_ONCE(1, "Only MTRR_TYPE_WRCOMB (3) make sense\n"); 440 info->screen_base = ioremap(vesafb_fix.smem_start, vesafb_fix.smem_len); 441 } 442 443 if (!info->screen_base) { 444 printk(KERN_ERR 445 "vesafb: abort, cannot ioremap video memory 0x%x @ 0x%lx\n", 446 vesafb_fix.smem_len, vesafb_fix.smem_start); 447 err = -EIO; 448 goto err_release_region; 449 } 450 451 printk(KERN_INFO "vesafb: framebuffer at 0x%lx, mapped to 0x%p, " 452 "using %dk, total %dk\n", 453 vesafb_fix.smem_start, info->screen_base, 454 size_remap/1024, size_total/1024); 455 456 if (!ypan) 457 vesafb_ops.fb_pan_display = NULL; 458 459 info->fbops = &vesafb_ops; 460 info->var = vesafb_defined; 461 info->fix = vesafb_fix; 462 info->flags = (ypan ? FBINFO_HWACCEL_YPAN : 0); 463 464 if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) { 465 err = -ENOMEM; 466 goto err_release_region; 467 } 468 err = devm_aperture_acquire_for_platform_device(dev, par->base, par->size); 469 if (err) 470 goto err_fb_dealloc_cmap; 471 if (register_framebuffer(info)<0) { 472 err = -EINVAL; 473 goto err_fb_dealloc_cmap; 474 } 475 fb_info(info, "%s frame buffer device\n", info->fix.id); 476 return 0; 477 err_fb_dealloc_cmap: 478 fb_dealloc_cmap(&info->cmap); 479 err_release_region: 480 arch_phys_wc_del(par->wc_cookie); 481 if (info->screen_base) 482 iounmap(info->screen_base); 483 if (par->region) 484 release_region(0x3c0, 32); 485 framebuffer_release(info); 486 release_mem_region(vesafb_fix.smem_start, size_total); 487 return err; 488 } 489 490 static void vesafb_remove(struct platform_device *pdev) 491 { 492 struct fb_info *info = platform_get_drvdata(pdev); 493 494 if (((struct vesafb_par *)(info->par))->region) 495 release_region(0x3c0, 32); 496 497 /* vesafb_destroy takes care of info cleanup */ 498 unregister_framebuffer(info); 499 } 500 501 static struct platform_driver vesafb_driver = { 502 .driver = { 503 .name = "vesa-framebuffer", 504 }, 505 .probe = vesafb_probe, 506 .remove_new = vesafb_remove, 507 }; 508 509 module_platform_driver(vesafb_driver); 510 MODULE_LICENSE("GPL"); 511