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