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 /* 183 * fb_ops.fb_destroy is called by the last put_fb_info() call at the end 184 * of unregister_framebuffer() or fb_release(). Do any cleanup here. 185 */ 186 static void vesafb_destroy(struct fb_info *info) 187 { 188 struct vesafb_par *par = info->par; 189 190 fb_dealloc_cmap(&info->cmap); 191 arch_phys_wc_del(par->wc_cookie); 192 if (info->screen_base) 193 iounmap(info->screen_base); 194 release_mem_region(info->apertures->ranges[0].base, info->apertures->ranges[0].size); 195 196 framebuffer_release(info); 197 } 198 199 static struct fb_ops vesafb_ops = { 200 .owner = THIS_MODULE, 201 .fb_destroy = vesafb_destroy, 202 .fb_setcolreg = vesafb_setcolreg, 203 .fb_pan_display = vesafb_pan_display, 204 .fb_fillrect = cfb_fillrect, 205 .fb_copyarea = cfb_copyarea, 206 .fb_imageblit = cfb_imageblit, 207 }; 208 209 static int vesafb_setup(char *options) 210 { 211 char *this_opt; 212 213 if (!options || !*options) 214 return 0; 215 216 while ((this_opt = strsep(&options, ",")) != NULL) { 217 if (!*this_opt) continue; 218 219 if (! strcmp(this_opt, "inverse")) 220 inverse=1; 221 else if (! strcmp(this_opt, "redraw")) 222 ypan=0; 223 else if (! strcmp(this_opt, "ypan")) 224 ypan=1; 225 else if (! strcmp(this_opt, "ywrap")) 226 ypan=2; 227 else if (! strcmp(this_opt, "vgapal")) 228 pmi_setpal=0; 229 else if (! strcmp(this_opt, "pmipal")) 230 pmi_setpal=1; 231 else if (! strncmp(this_opt, "mtrr:", 5)) 232 mtrr = simple_strtoul(this_opt+5, NULL, 0); 233 else if (! strcmp(this_opt, "nomtrr")) 234 mtrr=0; 235 else if (! strncmp(this_opt, "vtotal:", 7)) 236 vram_total = simple_strtoul(this_opt+7, NULL, 0); 237 else if (! strncmp(this_opt, "vremap:", 7)) 238 vram_remap = simple_strtoul(this_opt+7, NULL, 0); 239 } 240 return 0; 241 } 242 243 static int vesafb_probe(struct platform_device *dev) 244 { 245 struct fb_info *info; 246 struct vesafb_par *par; 247 int i, err; 248 unsigned int size_vmode; 249 unsigned int size_remap; 250 unsigned int size_total; 251 char *option = NULL; 252 253 /* ignore error return of fb_get_options */ 254 fb_get_options("vesafb", &option); 255 vesafb_setup(option); 256 257 if (screen_info.orig_video_isVGA != VIDEO_TYPE_VLFB) 258 return -ENODEV; 259 260 vga_compat = (screen_info.capabilities & 2) ? 0 : 1; 261 vesafb_fix.smem_start = screen_info.lfb_base; 262 vesafb_defined.bits_per_pixel = screen_info.lfb_depth; 263 if (15 == vesafb_defined.bits_per_pixel) 264 vesafb_defined.bits_per_pixel = 16; 265 vesafb_defined.xres = screen_info.lfb_width; 266 vesafb_defined.yres = screen_info.lfb_height; 267 vesafb_fix.line_length = screen_info.lfb_linelength; 268 vesafb_fix.visual = (vesafb_defined.bits_per_pixel == 8) ? 269 FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_TRUECOLOR; 270 271 /* size_vmode -- that is the amount of memory needed for the 272 * used video mode, i.e. the minimum amount of 273 * memory we need. */ 274 size_vmode = vesafb_defined.yres * vesafb_fix.line_length; 275 276 /* size_total -- all video memory we have. Used for mtrr 277 * entries, resource allocation and bounds 278 * checking. */ 279 size_total = screen_info.lfb_size * 65536; 280 if (vram_total) 281 size_total = vram_total * 1024 * 1024; 282 if (size_total < size_vmode) 283 size_total = size_vmode; 284 285 /* size_remap -- the amount of video memory we are going to 286 * use for vesafb. With modern cards it is no 287 * option to simply use size_total as that 288 * wastes plenty of kernel address space. */ 289 size_remap = size_vmode * 2; 290 if (vram_remap) 291 size_remap = vram_remap * 1024 * 1024; 292 if (size_remap < size_vmode) 293 size_remap = size_vmode; 294 if (size_remap > size_total) 295 size_remap = size_total; 296 vesafb_fix.smem_len = size_remap; 297 298 #ifndef __i386__ 299 screen_info.vesapm_seg = 0; 300 #endif 301 302 if (!request_mem_region(vesafb_fix.smem_start, size_total, "vesafb")) { 303 printk(KERN_WARNING 304 "vesafb: cannot reserve video memory at 0x%lx\n", 305 vesafb_fix.smem_start); 306 /* We cannot make this fatal. Sometimes this comes from magic 307 spaces our resource handlers simply don't know about */ 308 } 309 310 info = framebuffer_alloc(sizeof(struct vesafb_par), &dev->dev); 311 if (!info) { 312 release_mem_region(vesafb_fix.smem_start, size_total); 313 return -ENOMEM; 314 } 315 platform_set_drvdata(dev, info); 316 par = info->par; 317 info->pseudo_palette = par->pseudo_palette; 318 319 /* set vesafb aperture size for generic probing */ 320 info->apertures = alloc_apertures(1); 321 if (!info->apertures) { 322 err = -ENOMEM; 323 goto err; 324 } 325 info->apertures->ranges[0].base = screen_info.lfb_base; 326 info->apertures->ranges[0].size = size_total; 327 328 printk(KERN_INFO "vesafb: mode is %dx%dx%d, linelength=%d, pages=%d\n", 329 vesafb_defined.xres, vesafb_defined.yres, vesafb_defined.bits_per_pixel, vesafb_fix.line_length, screen_info.pages); 330 331 if (screen_info.vesapm_seg) { 332 printk(KERN_INFO "vesafb: protected mode interface info at %04x:%04x\n", 333 screen_info.vesapm_seg,screen_info.vesapm_off); 334 } 335 336 if (screen_info.vesapm_seg < 0xc000) 337 ypan = pmi_setpal = 0; /* not available or some DOS TSR ... */ 338 339 if (ypan || pmi_setpal) { 340 unsigned short *pmi_base; 341 pmi_base = (unsigned short*)phys_to_virt(((unsigned long)screen_info.vesapm_seg << 4) + screen_info.vesapm_off); 342 pmi_start = (void*)((char*)pmi_base + pmi_base[1]); 343 pmi_pal = (void*)((char*)pmi_base + pmi_base[2]); 344 printk(KERN_INFO "vesafb: pmi: set display start = %p, set palette = %p\n",pmi_start,pmi_pal); 345 if (pmi_base[3]) { 346 printk(KERN_INFO "vesafb: pmi: ports = "); 347 for (i = pmi_base[3]/2; pmi_base[i] != 0xffff; i++) 348 printk("%x ", pmi_base[i]); 349 printk("\n"); 350 if (pmi_base[i] != 0xffff) { 351 /* 352 * memory areas not supported (yet?) 353 * 354 * Rules are: we have to set up a descriptor for the requested 355 * memory area and pass it in the ES register to the BIOS function. 356 */ 357 printk(KERN_INFO "vesafb: can't handle memory requests, pmi disabled\n"); 358 ypan = pmi_setpal = 0; 359 } 360 } 361 } 362 363 if (vesafb_defined.bits_per_pixel == 8 && !pmi_setpal && !vga_compat) { 364 printk(KERN_WARNING "vesafb: hardware palette is unchangeable,\n" 365 " colors may be incorrect\n"); 366 vesafb_fix.visual = FB_VISUAL_STATIC_PSEUDOCOLOR; 367 } 368 369 vesafb_defined.xres_virtual = vesafb_defined.xres; 370 vesafb_defined.yres_virtual = vesafb_fix.smem_len / vesafb_fix.line_length; 371 if (ypan && vesafb_defined.yres_virtual > vesafb_defined.yres) { 372 printk(KERN_INFO "vesafb: scrolling: %s using protected mode interface, yres_virtual=%d\n", 373 (ypan > 1) ? "ywrap" : "ypan",vesafb_defined.yres_virtual); 374 } else { 375 printk(KERN_INFO "vesafb: scrolling: redraw\n"); 376 vesafb_defined.yres_virtual = vesafb_defined.yres; 377 ypan = 0; 378 } 379 380 /* some dummy values for timing to make fbset happy */ 381 vesafb_defined.pixclock = 10000000 / vesafb_defined.xres * 1000 / vesafb_defined.yres; 382 vesafb_defined.left_margin = (vesafb_defined.xres / 8) & 0xf8; 383 vesafb_defined.hsync_len = (vesafb_defined.xres / 8) & 0xf8; 384 385 vesafb_defined.red.offset = screen_info.red_pos; 386 vesafb_defined.red.length = screen_info.red_size; 387 vesafb_defined.green.offset = screen_info.green_pos; 388 vesafb_defined.green.length = screen_info.green_size; 389 vesafb_defined.blue.offset = screen_info.blue_pos; 390 vesafb_defined.blue.length = screen_info.blue_size; 391 vesafb_defined.transp.offset = screen_info.rsvd_pos; 392 vesafb_defined.transp.length = screen_info.rsvd_size; 393 394 if (vesafb_defined.bits_per_pixel <= 8) { 395 depth = vesafb_defined.green.length; 396 vesafb_defined.red.length = 397 vesafb_defined.green.length = 398 vesafb_defined.blue.length = 399 vesafb_defined.bits_per_pixel; 400 } 401 402 printk(KERN_INFO "vesafb: %s: " 403 "size=%d:%d:%d:%d, shift=%d:%d:%d:%d\n", 404 (vesafb_defined.bits_per_pixel > 8) ? 405 "Truecolor" : (vga_compat || pmi_setpal) ? 406 "Pseudocolor" : "Static Pseudocolor", 407 screen_info.rsvd_size, 408 screen_info.red_size, 409 screen_info.green_size, 410 screen_info.blue_size, 411 screen_info.rsvd_pos, 412 screen_info.red_pos, 413 screen_info.green_pos, 414 screen_info.blue_pos); 415 416 vesafb_fix.ypanstep = ypan ? 1 : 0; 417 vesafb_fix.ywrapstep = (ypan>1) ? 1 : 0; 418 419 /* request failure does not faze us, as vgacon probably has this 420 * region already (FIXME) */ 421 par->region = request_region(0x3c0, 32, "vesafb"); 422 423 if (mtrr == 3) { 424 unsigned int temp_size = size_total; 425 426 /* Find the largest power-of-two */ 427 temp_size = roundup_pow_of_two(temp_size); 428 429 /* Try and find a power of two to add */ 430 do { 431 par->wc_cookie = 432 arch_phys_wc_add(vesafb_fix.smem_start, 433 temp_size); 434 temp_size >>= 1; 435 } while (temp_size >= PAGE_SIZE && par->wc_cookie < 0); 436 437 info->screen_base = ioremap_wc(vesafb_fix.smem_start, vesafb_fix.smem_len); 438 } else { 439 if (mtrr && mtrr != 3) 440 WARN_ONCE(1, "Only MTRR_TYPE_WRCOMB (3) make sense\n"); 441 info->screen_base = ioremap(vesafb_fix.smem_start, vesafb_fix.smem_len); 442 } 443 444 if (!info->screen_base) { 445 printk(KERN_ERR 446 "vesafb: abort, cannot ioremap video memory 0x%x @ 0x%lx\n", 447 vesafb_fix.smem_len, vesafb_fix.smem_start); 448 err = -EIO; 449 goto err_release_region; 450 } 451 452 printk(KERN_INFO "vesafb: framebuffer at 0x%lx, mapped to 0x%p, " 453 "using %dk, total %dk\n", 454 vesafb_fix.smem_start, info->screen_base, 455 size_remap/1024, size_total/1024); 456 457 if (!ypan) 458 vesafb_ops.fb_pan_display = NULL; 459 460 info->fbops = &vesafb_ops; 461 info->var = vesafb_defined; 462 info->fix = vesafb_fix; 463 info->flags = FBINFO_FLAG_DEFAULT | FBINFO_MISC_FIRMWARE | 464 (ypan ? FBINFO_HWACCEL_YPAN : 0); 465 466 if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) { 467 err = -ENOMEM; 468 goto err_release_region; 469 } 470 if (register_framebuffer(info)<0) { 471 err = -EINVAL; 472 fb_dealloc_cmap(&info->cmap); 473 goto err_release_region; 474 } 475 fb_info(info, "%s frame buffer device\n", info->fix.id); 476 return 0; 477 err_release_region: 478 arch_phys_wc_del(par->wc_cookie); 479 if (info->screen_base) 480 iounmap(info->screen_base); 481 if (par->region) 482 release_region(0x3c0, 32); 483 err: 484 framebuffer_release(info); 485 release_mem_region(vesafb_fix.smem_start, size_total); 486 return err; 487 } 488 489 static int vesafb_remove(struct platform_device *pdev) 490 { 491 struct fb_info *info = platform_get_drvdata(pdev); 492 493 if (((struct vesafb_par *)(info->par))->region) 494 release_region(0x3c0, 32); 495 496 /* vesafb_destroy takes care of info cleanup */ 497 unregister_framebuffer(info); 498 499 return 0; 500 } 501 502 static struct platform_driver vesafb_driver = { 503 .driver = { 504 .name = "vesa-framebuffer", 505 }, 506 .probe = vesafb_probe, 507 .remove = vesafb_remove, 508 }; 509 510 module_platform_driver(vesafb_driver); 511 MODULE_LICENSE("GPL"); 512