1/* 2 * framebuffer driver for VBE 2.0 compliant graphic boards 3 * 4 * switching to graphics mode happens at boot time (while 5 * running in real mode, see arch/i386/boot/video.S). 6 * 7 * (c) 1998 Gerd Knorr <kraxel@goldbach.in-berlin.de> 8 * 9 */ 10 11#include <linux/module.h> 12#include <linux/kernel.h> 13#include <linux/errno.h> 14#include <linux/string.h> 15#include <linux/mm.h> 16#include <linux/delay.h> 17#include <linux/fb.h> 18#include <linux/ioport.h> 19#include <linux/init.h> 20#include <linux/platform_device.h> 21#include <linux/screen_info.h> 22 23#include <video/vga.h> 24#include <asm/io.h> 25#include <asm/mtrr.h> 26 27#define dac_reg (0x3c8) 28#define dac_val (0x3c9) 29 30/* --------------------------------------------------------------------- */ 31 32static struct fb_var_screeninfo vesafb_defined __initdata = { 33 .activate = FB_ACTIVATE_NOW, 34 .height = -1, 35 .width = -1, 36 .right_margin = 32, 37 .upper_margin = 16, 38 .lower_margin = 4, 39 .vsync_len = 4, 40 .vmode = FB_VMODE_NONINTERLACED, 41}; 42 43static struct fb_fix_screeninfo vesafb_fix __initdata = { 44 .id = "VESA VGA", 45 .type = FB_TYPE_PACKED_PIXELS, 46 .accel = FB_ACCEL_NONE, 47}; 48 49static int inverse __read_mostly; 50static int mtrr __read_mostly; /* disable mtrr */ 51static int vram_remap __initdata; /* Set amount of memory to be used */ 52static int vram_total __initdata; /* Set total amount of memory */ 53static int pmi_setpal __read_mostly = 1; /* pmi for palette changes ??? */ 54static int ypan __read_mostly; /* 0..nothing, 1..ypan, 2..ywrap */ 55static void (*pmi_start)(void) __read_mostly; 56static void (*pmi_pal) (void) __read_mostly; 57static int depth __read_mostly; 58static int vga_compat __read_mostly; 59/* --------------------------------------------------------------------- */ 60 61static int vesafb_pan_display(struct fb_var_screeninfo *var, 62 struct fb_info *info) 63{ 64#ifdef __i386__ 65 int offset; 66 67 offset = (var->yoffset * info->fix.line_length + var->xoffset) / 4; 68 69 __asm__ __volatile__( 70 "call *(%%edi)" 71 : /* no return value */ 72 : "a" (0x4f07), /* EAX */ 73 "b" (0), /* EBX */ 74 "c" (offset), /* ECX */ 75 "d" (offset >> 16), /* EDX */ 76 "D" (&pmi_start)); /* EDI */ 77#endif 78 return 0; 79} 80 81static int vesa_setpalette(int regno, unsigned red, unsigned green, 82 unsigned blue) 83{ 84 int shift = 16 - depth; 85 int err = -EINVAL; 86 87/* 88 * Try VGA registers first... 89 */ 90 if (vga_compat) { 91 outb_p(regno, dac_reg); 92 outb_p(red >> shift, dac_val); 93 outb_p(green >> shift, dac_val); 94 outb_p(blue >> shift, dac_val); 95 err = 0; 96 } 97 98#ifdef __i386__ 99/* 100 * Fallback to the PMI.... 101 */ 102 if (err && pmi_setpal) { 103 struct { u_char blue, green, red, pad; } entry; 104 105 entry.red = red >> shift; 106 entry.green = green >> shift; 107 entry.blue = blue >> shift; 108 entry.pad = 0; 109 __asm__ __volatile__( 110 "call *(%%esi)" 111 : /* no return value */ 112 : "a" (0x4f09), /* EAX */ 113 "b" (0), /* EBX */ 114 "c" (1), /* ECX */ 115 "d" (regno), /* EDX */ 116 "D" (&entry), /* EDI */ 117 "S" (&pmi_pal)); /* ESI */ 118 err = 0; 119 } 120#endif 121 122 return err; 123} 124 125static int vesafb_setcolreg(unsigned regno, unsigned red, unsigned green, 126 unsigned blue, unsigned transp, 127 struct fb_info *info) 128{ 129 int err = 0; 130 131 /* 132 * Set a single color register. The values supplied are 133 * already rounded down to the hardware's capabilities 134 * (according to the entries in the `var' structure). Return 135 * != 0 for invalid regno. 136 */ 137 138 if (regno >= info->cmap.len) 139 return 1; 140 141 if (info->var.bits_per_pixel == 8) 142 err = vesa_setpalette(regno,red,green,blue); 143 else if (regno < 16) { 144 switch (info->var.bits_per_pixel) { 145 case 16: 146 if (info->var.red.offset == 10) { 147 /* 1:5:5:5 */ 148 ((u32*) (info->pseudo_palette))[regno] = 149 ((red & 0xf800) >> 1) | 150 ((green & 0xf800) >> 6) | 151 ((blue & 0xf800) >> 11); 152 } else { 153 /* 0:5:6:5 */ 154 ((u32*) (info->pseudo_palette))[regno] = 155 ((red & 0xf800) ) | 156 ((green & 0xfc00) >> 5) | 157 ((blue & 0xf800) >> 11); 158 } 159 break; 160 case 24: 161 case 32: 162 red >>= 8; 163 green >>= 8; 164 blue >>= 8; 165 ((u32 *)(info->pseudo_palette))[regno] = 166 (red << info->var.red.offset) | 167 (green << info->var.green.offset) | 168 (blue << info->var.blue.offset); 169 break; 170 } 171 } 172 173 return err; 174} 175 176static void vesafb_destroy(struct fb_info *info) 177{ 178 if (info->screen_base) 179 iounmap(info->screen_base); 180 release_mem_region(info->apertures->ranges[0].base, info->apertures->ranges[0].size); 181 framebuffer_release(info); 182} 183 184static struct fb_ops vesafb_ops = { 185 .owner = THIS_MODULE, 186 .fb_destroy = vesafb_destroy, 187 .fb_setcolreg = vesafb_setcolreg, 188 .fb_pan_display = vesafb_pan_display, 189 .fb_fillrect = cfb_fillrect, 190 .fb_copyarea = cfb_copyarea, 191 .fb_imageblit = cfb_imageblit, 192}; 193 194static int __init vesafb_setup(char *options) 195{ 196 char *this_opt; 197 198 if (!options || !*options) 199 return 0; 200 201 while ((this_opt = strsep(&options, ",")) != NULL) { 202 if (!*this_opt) continue; 203 204 if (! strcmp(this_opt, "inverse")) 205 inverse=1; 206 else if (! strcmp(this_opt, "redraw")) 207 ypan=0; 208 else if (! strcmp(this_opt, "ypan")) 209 ypan=1; 210 else if (! strcmp(this_opt, "ywrap")) 211 ypan=2; 212 else if (! strcmp(this_opt, "vgapal")) 213 pmi_setpal=0; 214 else if (! strcmp(this_opt, "pmipal")) 215 pmi_setpal=1; 216 else if (! strncmp(this_opt, "mtrr:", 5)) 217 mtrr = simple_strtoul(this_opt+5, NULL, 0); 218 else if (! strcmp(this_opt, "nomtrr")) 219 mtrr=0; 220 else if (! strncmp(this_opt, "vtotal:", 7)) 221 vram_total = simple_strtoul(this_opt+7, NULL, 0); 222 else if (! strncmp(this_opt, "vremap:", 7)) 223 vram_remap = simple_strtoul(this_opt+7, NULL, 0); 224 } 225 return 0; 226} 227 228static int __init vesafb_probe(struct platform_device *dev) 229{ 230 struct fb_info *info; 231 int i, err; 232 unsigned int size_vmode; 233 unsigned int size_remap; 234 unsigned int size_total; 235 236 if (screen_info.orig_video_isVGA != VIDEO_TYPE_VLFB) 237 return -ENODEV; 238 239 vga_compat = (screen_info.capabilities & 2) ? 0 : 1; 240 vesafb_fix.smem_start = screen_info.lfb_base; 241 vesafb_defined.bits_per_pixel = screen_info.lfb_depth; 242 if (15 == vesafb_defined.bits_per_pixel) 243 vesafb_defined.bits_per_pixel = 16; 244 vesafb_defined.xres = screen_info.lfb_width; 245 vesafb_defined.yres = screen_info.lfb_height; 246 vesafb_fix.line_length = screen_info.lfb_linelength; 247 vesafb_fix.visual = (vesafb_defined.bits_per_pixel == 8) ? 248 FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_TRUECOLOR; 249 250 /* size_vmode -- that is the amount of memory needed for the 251 * used video mode, i.e. the minimum amount of 252 * memory we need. */ 253 size_vmode = vesafb_defined.yres * vesafb_fix.line_length; 254 255 /* size_total -- all video memory we have. Used for mtrr 256 * entries, ressource allocation and bounds 257 * checking. */ 258 size_total = screen_info.lfb_size * 65536; 259 if (vram_total) 260 size_total = vram_total * 1024 * 1024; 261 if (size_total < size_vmode) 262 size_total = size_vmode; 263 264 /* size_remap -- the amount of video memory we are going to 265 * use for vesafb. With modern cards it is no 266 * option to simply use size_total as that 267 * wastes plenty of kernel address space. */ 268 size_remap = size_vmode * 2; 269 if (vram_remap) 270 size_remap = vram_remap * 1024 * 1024; 271 if (size_remap < size_vmode) 272 size_remap = size_vmode; 273 if (size_remap > size_total) 274 size_remap = size_total; 275 vesafb_fix.smem_len = size_remap; 276 277#ifndef __i386__ 278 screen_info.vesapm_seg = 0; 279#endif 280 281 if (!request_mem_region(vesafb_fix.smem_start, size_total, "vesafb")) { 282 printk(KERN_WARNING 283 "vesafb: cannot reserve video memory at 0x%lx\n", 284 vesafb_fix.smem_start); 285 /* We cannot make this fatal. Sometimes this comes from magic 286 spaces our resource handlers simply don't know about */ 287 } 288 289 info = framebuffer_alloc(sizeof(u32) * 256, &dev->dev); 290 if (!info) { 291 release_mem_region(vesafb_fix.smem_start, size_total); 292 return -ENOMEM; 293 } 294 info->pseudo_palette = info->par; 295 info->par = NULL; 296 297 /* set vesafb aperture size for generic probing */ 298 info->apertures = alloc_apertures(1); 299 if (!info->apertures) { 300 err = -ENOMEM; 301 goto err; 302 } 303 info->apertures->ranges[0].base = screen_info.lfb_base; 304 info->apertures->ranges[0].size = size_total; 305 306 info->screen_base = ioremap(vesafb_fix.smem_start, vesafb_fix.smem_len); 307 if (!info->screen_base) { 308 printk(KERN_ERR 309 "vesafb: abort, cannot ioremap video memory 0x%x @ 0x%lx\n", 310 vesafb_fix.smem_len, vesafb_fix.smem_start); 311 err = -EIO; 312 goto err; 313 } 314 315 printk(KERN_INFO "vesafb: framebuffer at 0x%lx, mapped to 0x%p, " 316 "using %dk, total %dk\n", 317 vesafb_fix.smem_start, info->screen_base, 318 size_remap/1024, size_total/1024); 319 printk(KERN_INFO "vesafb: mode is %dx%dx%d, linelength=%d, pages=%d\n", 320 vesafb_defined.xres, vesafb_defined.yres, vesafb_defined.bits_per_pixel, vesafb_fix.line_length, screen_info.pages); 321 322 if (screen_info.vesapm_seg) { 323 printk(KERN_INFO "vesafb: protected mode interface info at %04x:%04x\n", 324 screen_info.vesapm_seg,screen_info.vesapm_off); 325 } 326 327 if (screen_info.vesapm_seg < 0xc000) 328 ypan = pmi_setpal = 0; /* not available or some DOS TSR ... */ 329 330 if (ypan || pmi_setpal) { 331 unsigned short *pmi_base; 332 pmi_base = (unsigned short*)phys_to_virt(((unsigned long)screen_info.vesapm_seg << 4) + screen_info.vesapm_off); 333 pmi_start = (void*)((char*)pmi_base + pmi_base[1]); 334 pmi_pal = (void*)((char*)pmi_base + pmi_base[2]); 335 printk(KERN_INFO "vesafb: pmi: set display start = %p, set palette = %p\n",pmi_start,pmi_pal); 336 if (pmi_base[3]) { 337 printk(KERN_INFO "vesafb: pmi: ports = "); 338 for (i = pmi_base[3]/2; pmi_base[i] != 0xffff; i++) 339 printk("%x ",pmi_base[i]); 340 printk("\n"); 341 if (pmi_base[i] != 0xffff) { 342 /* 343 * memory areas not supported (yet?) 344 * 345 * Rules are: we have to set up a descriptor for the requested 346 * memory area and pass it in the ES register to the BIOS function. 347 */ 348 printk(KERN_INFO "vesafb: can't handle memory requests, pmi disabled\n"); 349 ypan = pmi_setpal = 0; 350 } 351 } 352 } 353 354 if (vesafb_defined.bits_per_pixel == 8 && !pmi_setpal && !vga_compat) { 355 printk(KERN_WARNING "vesafb: hardware palette is unchangeable,\n" 356 " colors may be incorrect\n"); 357 vesafb_fix.visual = FB_VISUAL_STATIC_PSEUDOCOLOR; 358 } 359 360 vesafb_defined.xres_virtual = vesafb_defined.xres; 361 vesafb_defined.yres_virtual = vesafb_fix.smem_len / vesafb_fix.line_length; 362 if (ypan && vesafb_defined.yres_virtual > vesafb_defined.yres) { 363 printk(KERN_INFO "vesafb: scrolling: %s using protected mode interface, yres_virtual=%d\n", 364 (ypan > 1) ? "ywrap" : "ypan",vesafb_defined.yres_virtual); 365 } else { 366 printk(KERN_INFO "vesafb: scrolling: redraw\n"); 367 vesafb_defined.yres_virtual = vesafb_defined.yres; 368 ypan = 0; 369 } 370 371 /* some dummy values for timing to make fbset happy */ 372 vesafb_defined.pixclock = 10000000 / vesafb_defined.xres * 1000 / vesafb_defined.yres; 373 vesafb_defined.left_margin = (vesafb_defined.xres / 8) & 0xf8; 374 vesafb_defined.hsync_len = (vesafb_defined.xres / 8) & 0xf8; 375 376 vesafb_defined.red.offset = screen_info.red_pos; 377 vesafb_defined.red.length = screen_info.red_size; 378 vesafb_defined.green.offset = screen_info.green_pos; 379 vesafb_defined.green.length = screen_info.green_size; 380 vesafb_defined.blue.offset = screen_info.blue_pos; 381 vesafb_defined.blue.length = screen_info.blue_size; 382 vesafb_defined.transp.offset = screen_info.rsvd_pos; 383 vesafb_defined.transp.length = screen_info.rsvd_size; 384 385 if (vesafb_defined.bits_per_pixel <= 8) { 386 depth = vesafb_defined.green.length; 387 vesafb_defined.red.length = 388 vesafb_defined.green.length = 389 vesafb_defined.blue.length = 390 vesafb_defined.bits_per_pixel; 391 } 392 393 printk(KERN_INFO "vesafb: %s: " 394 "size=%d:%d:%d:%d, shift=%d:%d:%d:%d\n", 395 (vesafb_defined.bits_per_pixel > 8) ? 396 "Truecolor" : (vga_compat || pmi_setpal) ? 397 "Pseudocolor" : "Static Pseudocolor", 398 screen_info.rsvd_size, 399 screen_info.red_size, 400 screen_info.green_size, 401 screen_info.blue_size, 402 screen_info.rsvd_pos, 403 screen_info.red_pos, 404 screen_info.green_pos, 405 screen_info.blue_pos); 406 407 vesafb_fix.ypanstep = ypan ? 1 : 0; 408 vesafb_fix.ywrapstep = (ypan>1) ? 1 : 0; 409 410 request_region(0x3c0, 32, "vesafb"); 411 412#ifdef CONFIG_MTRR 413 if (mtrr) { 414 unsigned int temp_size = size_total; 415 unsigned int type = 0; 416 417 switch (mtrr) { 418 case 1: 419 type = MTRR_TYPE_UNCACHABLE; 420 break; 421 case 2: 422 type = MTRR_TYPE_WRBACK; 423 break; 424 case 3: 425 type = MTRR_TYPE_WRCOMB; 426 break; 427 case 4: 428 type = MTRR_TYPE_WRTHROUGH; 429 break; 430 default: 431 type = 0; 432 break; 433 } 434 435 if (type) { 436 int rc; 437 438 /* Find the largest power-of-two */ 439 while (temp_size & (temp_size - 1)) 440 temp_size &= (temp_size - 1); 441 442 /* Try and find a power of two to add */ 443 do { 444 rc = mtrr_add(vesafb_fix.smem_start, temp_size, 445 type, 1); 446 temp_size >>= 1; 447 } while (temp_size >= PAGE_SIZE && rc == -EINVAL); 448 } 449 } 450#endif 451 452 info->fbops = &vesafb_ops; 453 info->var = vesafb_defined; 454 info->fix = vesafb_fix; 455 info->flags = FBINFO_FLAG_DEFAULT | FBINFO_MISC_FIRMWARE | 456 (ypan ? FBINFO_HWACCEL_YPAN : 0); 457 458 if (!ypan) 459 info->fbops->fb_pan_display = NULL; 460 461 if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) { 462 err = -ENOMEM; 463 goto err; 464 } 465 if (register_framebuffer(info)<0) { 466 err = -EINVAL; 467 fb_dealloc_cmap(&info->cmap); 468 goto err; 469 } 470 printk(KERN_INFO "fb%d: %s frame buffer device\n", 471 info->node, info->fix.id); 472 return 0; 473err: 474 if (info->screen_base) 475 iounmap(info->screen_base); 476 framebuffer_release(info); 477 release_mem_region(vesafb_fix.smem_start, size_total); 478 return err; 479} 480 481static struct platform_driver vesafb_driver = { 482 .driver = { 483 .name = "vesafb", 484 }, 485}; 486 487static struct platform_device *vesafb_device; 488 489static int __init vesafb_init(void) 490{ 491 int ret; 492 char *option = NULL; 493 494 /* ignore error return of fb_get_options */ 495 fb_get_options("vesafb", &option); 496 vesafb_setup(option); 497 498 vesafb_device = platform_device_alloc("vesafb", 0); 499 if (!vesafb_device) 500 return -ENOMEM; 501 502 ret = platform_device_add(vesafb_device); 503 if (!ret) { 504 ret = platform_driver_probe(&vesafb_driver, vesafb_probe); 505 if (ret) 506 platform_device_del(vesafb_device); 507 } 508 509 if (ret) { 510 platform_device_put(vesafb_device); 511 vesafb_device = NULL; 512 } 513 514 return ret; 515} 516module_init(vesafb_init); 517 518MODULE_LICENSE("GPL"); 519