1 /* 2 * Framebuffer driver for EFI/UEFI based system 3 * 4 * (c) 2006 Edgar Hucek <gimli@dark-green.com> 5 * Original efi driver written by Gerd Knorr <kraxel@goldbach.in-berlin.de> 6 * 7 */ 8 9 #include <linux/kernel.h> 10 #include <linux/efi.h> 11 #include <linux/errno.h> 12 #include <linux/fb.h> 13 #include <linux/pci.h> 14 #include <linux/platform_device.h> 15 #include <linux/screen_info.h> 16 #include <video/vga.h> 17 #include <asm/efi.h> 18 19 static bool request_mem_succeeded = false; 20 static bool nowc = false; 21 22 static struct fb_var_screeninfo efifb_defined = { 23 .activate = FB_ACTIVATE_NOW, 24 .height = -1, 25 .width = -1, 26 .right_margin = 32, 27 .upper_margin = 16, 28 .lower_margin = 4, 29 .vsync_len = 4, 30 .vmode = FB_VMODE_NONINTERLACED, 31 }; 32 33 static struct fb_fix_screeninfo efifb_fix = { 34 .id = "EFI VGA", 35 .type = FB_TYPE_PACKED_PIXELS, 36 .accel = FB_ACCEL_NONE, 37 .visual = FB_VISUAL_TRUECOLOR, 38 }; 39 40 static int efifb_setcolreg(unsigned regno, unsigned red, unsigned green, 41 unsigned blue, unsigned transp, 42 struct fb_info *info) 43 { 44 /* 45 * Set a single color register. The values supplied are 46 * already rounded down to the hardware's capabilities 47 * (according to the entries in the `var' structure). Return 48 * != 0 for invalid regno. 49 */ 50 51 if (regno >= info->cmap.len) 52 return 1; 53 54 if (regno < 16) { 55 red >>= 16 - info->var.red.length; 56 green >>= 16 - info->var.green.length; 57 blue >>= 16 - info->var.blue.length; 58 ((u32 *)(info->pseudo_palette))[regno] = 59 (red << info->var.red.offset) | 60 (green << info->var.green.offset) | 61 (blue << info->var.blue.offset); 62 } 63 return 0; 64 } 65 66 static void efifb_destroy(struct fb_info *info) 67 { 68 if (info->screen_base) 69 iounmap(info->screen_base); 70 if (request_mem_succeeded) 71 release_mem_region(info->apertures->ranges[0].base, 72 info->apertures->ranges[0].size); 73 fb_dealloc_cmap(&info->cmap); 74 } 75 76 static struct fb_ops efifb_ops = { 77 .owner = THIS_MODULE, 78 .fb_destroy = efifb_destroy, 79 .fb_setcolreg = efifb_setcolreg, 80 .fb_fillrect = cfb_fillrect, 81 .fb_copyarea = cfb_copyarea, 82 .fb_imageblit = cfb_imageblit, 83 }; 84 85 static int efifb_setup(char *options) 86 { 87 char *this_opt; 88 89 if (options && *options) { 90 while ((this_opt = strsep(&options, ",")) != NULL) { 91 if (!*this_opt) continue; 92 93 efifb_setup_from_dmi(&screen_info, this_opt); 94 95 if (!strncmp(this_opt, "base:", 5)) 96 screen_info.lfb_base = simple_strtoul(this_opt+5, NULL, 0); 97 else if (!strncmp(this_opt, "stride:", 7)) 98 screen_info.lfb_linelength = simple_strtoul(this_opt+7, NULL, 0) * 4; 99 else if (!strncmp(this_opt, "height:", 7)) 100 screen_info.lfb_height = simple_strtoul(this_opt+7, NULL, 0); 101 else if (!strncmp(this_opt, "width:", 6)) 102 screen_info.lfb_width = simple_strtoul(this_opt+6, NULL, 0); 103 else if (!strcmp(this_opt, "nowc")) 104 nowc = true; 105 } 106 } 107 108 return 0; 109 } 110 111 static inline bool fb_base_is_valid(void) 112 { 113 if (screen_info.lfb_base) 114 return true; 115 116 if (!(screen_info.capabilities & VIDEO_CAPABILITY_64BIT_BASE)) 117 return false; 118 119 if (screen_info.ext_lfb_base) 120 return true; 121 122 return false; 123 } 124 125 #define efifb_attr_decl(name, fmt) \ 126 static ssize_t name##_show(struct device *dev, \ 127 struct device_attribute *attr, \ 128 char *buf) \ 129 { \ 130 return sprintf(buf, fmt "\n", (screen_info.lfb_##name)); \ 131 } \ 132 static DEVICE_ATTR_RO(name) 133 134 efifb_attr_decl(base, "0x%x"); 135 efifb_attr_decl(linelength, "%u"); 136 efifb_attr_decl(height, "%u"); 137 efifb_attr_decl(width, "%u"); 138 efifb_attr_decl(depth, "%u"); 139 140 static struct attribute *efifb_attrs[] = { 141 &dev_attr_base.attr, 142 &dev_attr_linelength.attr, 143 &dev_attr_width.attr, 144 &dev_attr_height.attr, 145 &dev_attr_depth.attr, 146 NULL 147 }; 148 ATTRIBUTE_GROUPS(efifb); 149 150 static bool pci_dev_disabled; /* FB base matches BAR of a disabled device */ 151 152 static struct pci_dev *efifb_pci_dev; /* dev with BAR covering the efifb */ 153 static struct resource *bar_resource; 154 static u64 bar_offset; 155 156 static int efifb_probe(struct platform_device *dev) 157 { 158 struct fb_info *info; 159 int err; 160 unsigned int size_vmode; 161 unsigned int size_remap; 162 unsigned int size_total; 163 char *option = NULL; 164 165 if (screen_info.orig_video_isVGA != VIDEO_TYPE_EFI || pci_dev_disabled) 166 return -ENODEV; 167 168 if (fb_get_options("efifb", &option)) 169 return -ENODEV; 170 efifb_setup(option); 171 172 /* We don't get linelength from UGA Draw Protocol, only from 173 * EFI Graphics Protocol. So if it's not in DMI, and it's not 174 * passed in from the user, we really can't use the framebuffer. 175 */ 176 if (!screen_info.lfb_linelength) 177 return -ENODEV; 178 179 if (!screen_info.lfb_depth) 180 screen_info.lfb_depth = 32; 181 if (!screen_info.pages) 182 screen_info.pages = 1; 183 if (!fb_base_is_valid()) { 184 printk(KERN_DEBUG "efifb: invalid framebuffer address\n"); 185 return -ENODEV; 186 } 187 printk(KERN_INFO "efifb: probing for efifb\n"); 188 189 /* just assume they're all unset if any are */ 190 if (!screen_info.blue_size) { 191 screen_info.blue_size = 8; 192 screen_info.blue_pos = 0; 193 screen_info.green_size = 8; 194 screen_info.green_pos = 8; 195 screen_info.red_size = 8; 196 screen_info.red_pos = 16; 197 screen_info.rsvd_size = 8; 198 screen_info.rsvd_pos = 24; 199 } 200 201 efifb_fix.smem_start = screen_info.lfb_base; 202 203 if (screen_info.capabilities & VIDEO_CAPABILITY_64BIT_BASE) { 204 u64 ext_lfb_base; 205 206 ext_lfb_base = (u64)(unsigned long)screen_info.ext_lfb_base << 32; 207 efifb_fix.smem_start |= ext_lfb_base; 208 } 209 210 if (bar_resource && 211 bar_resource->start + bar_offset != efifb_fix.smem_start) { 212 dev_info(&efifb_pci_dev->dev, 213 "BAR has moved, updating efifb address\n"); 214 efifb_fix.smem_start = bar_resource->start + bar_offset; 215 } 216 217 efifb_defined.bits_per_pixel = screen_info.lfb_depth; 218 efifb_defined.xres = screen_info.lfb_width; 219 efifb_defined.yres = screen_info.lfb_height; 220 efifb_fix.line_length = screen_info.lfb_linelength; 221 222 /* size_vmode -- that is the amount of memory needed for the 223 * used video mode, i.e. the minimum amount of 224 * memory we need. */ 225 size_vmode = efifb_defined.yres * efifb_fix.line_length; 226 227 /* size_total -- all video memory we have. Used for 228 * entries, ressource allocation and bounds 229 * checking. */ 230 size_total = screen_info.lfb_size; 231 if (size_total < size_vmode) 232 size_total = size_vmode; 233 234 /* size_remap -- the amount of video memory we are going to 235 * use for efifb. With modern cards it is no 236 * option to simply use size_total as that 237 * wastes plenty of kernel address space. */ 238 size_remap = size_vmode * 2; 239 if (size_remap > size_total) 240 size_remap = size_total; 241 if (size_remap % PAGE_SIZE) 242 size_remap += PAGE_SIZE - (size_remap % PAGE_SIZE); 243 efifb_fix.smem_len = size_remap; 244 245 if (request_mem_region(efifb_fix.smem_start, size_remap, "efifb")) { 246 request_mem_succeeded = true; 247 } else { 248 /* We cannot make this fatal. Sometimes this comes from magic 249 spaces our resource handlers simply don't know about */ 250 pr_warn("efifb: cannot reserve video memory at 0x%lx\n", 251 efifb_fix.smem_start); 252 } 253 254 info = framebuffer_alloc(sizeof(u32) * 16, &dev->dev); 255 if (!info) { 256 pr_err("efifb: cannot allocate framebuffer\n"); 257 err = -ENOMEM; 258 goto err_release_mem; 259 } 260 platform_set_drvdata(dev, info); 261 info->pseudo_palette = info->par; 262 info->par = NULL; 263 264 info->apertures = alloc_apertures(1); 265 if (!info->apertures) { 266 err = -ENOMEM; 267 goto err_release_fb; 268 } 269 info->apertures->ranges[0].base = efifb_fix.smem_start; 270 info->apertures->ranges[0].size = size_remap; 271 272 if (nowc) 273 info->screen_base = ioremap(efifb_fix.smem_start, efifb_fix.smem_len); 274 else 275 info->screen_base = ioremap_wc(efifb_fix.smem_start, efifb_fix.smem_len); 276 if (!info->screen_base) { 277 pr_err("efifb: abort, cannot ioremap video memory 0x%x @ 0x%lx\n", 278 efifb_fix.smem_len, efifb_fix.smem_start); 279 err = -EIO; 280 goto err_release_fb; 281 } 282 283 pr_info("efifb: framebuffer at 0x%lx, using %dk, total %dk\n", 284 efifb_fix.smem_start, size_remap/1024, size_total/1024); 285 pr_info("efifb: mode is %dx%dx%d, linelength=%d, pages=%d\n", 286 efifb_defined.xres, efifb_defined.yres, 287 efifb_defined.bits_per_pixel, efifb_fix.line_length, 288 screen_info.pages); 289 290 efifb_defined.xres_virtual = efifb_defined.xres; 291 efifb_defined.yres_virtual = efifb_fix.smem_len / 292 efifb_fix.line_length; 293 pr_info("efifb: scrolling: redraw\n"); 294 efifb_defined.yres_virtual = efifb_defined.yres; 295 296 /* some dummy values for timing to make fbset happy */ 297 efifb_defined.pixclock = 10000000 / efifb_defined.xres * 298 1000 / efifb_defined.yres; 299 efifb_defined.left_margin = (efifb_defined.xres / 8) & 0xf8; 300 efifb_defined.hsync_len = (efifb_defined.xres / 8) & 0xf8; 301 302 efifb_defined.red.offset = screen_info.red_pos; 303 efifb_defined.red.length = screen_info.red_size; 304 efifb_defined.green.offset = screen_info.green_pos; 305 efifb_defined.green.length = screen_info.green_size; 306 efifb_defined.blue.offset = screen_info.blue_pos; 307 efifb_defined.blue.length = screen_info.blue_size; 308 efifb_defined.transp.offset = screen_info.rsvd_pos; 309 efifb_defined.transp.length = screen_info.rsvd_size; 310 311 pr_info("efifb: %s: " 312 "size=%d:%d:%d:%d, shift=%d:%d:%d:%d\n", 313 "Truecolor", 314 screen_info.rsvd_size, 315 screen_info.red_size, 316 screen_info.green_size, 317 screen_info.blue_size, 318 screen_info.rsvd_pos, 319 screen_info.red_pos, 320 screen_info.green_pos, 321 screen_info.blue_pos); 322 323 efifb_fix.ypanstep = 0; 324 efifb_fix.ywrapstep = 0; 325 326 info->fbops = &efifb_ops; 327 info->var = efifb_defined; 328 info->fix = efifb_fix; 329 info->flags = FBINFO_FLAG_DEFAULT | FBINFO_MISC_FIRMWARE; 330 331 err = sysfs_create_groups(&dev->dev.kobj, efifb_groups); 332 if (err) { 333 pr_err("efifb: cannot add sysfs attrs\n"); 334 goto err_unmap; 335 } 336 err = fb_alloc_cmap(&info->cmap, 256, 0); 337 if (err < 0) { 338 pr_err("efifb: cannot allocate colormap\n"); 339 goto err_groups; 340 } 341 err = register_framebuffer(info); 342 if (err < 0) { 343 pr_err("efifb: cannot register framebuffer\n"); 344 goto err_fb_dealoc; 345 } 346 fb_info(info, "%s frame buffer device\n", info->fix.id); 347 return 0; 348 349 err_fb_dealoc: 350 fb_dealloc_cmap(&info->cmap); 351 err_groups: 352 sysfs_remove_groups(&dev->dev.kobj, efifb_groups); 353 err_unmap: 354 iounmap(info->screen_base); 355 err_release_fb: 356 framebuffer_release(info); 357 err_release_mem: 358 if (request_mem_succeeded) 359 release_mem_region(efifb_fix.smem_start, size_total); 360 return err; 361 } 362 363 static int efifb_remove(struct platform_device *pdev) 364 { 365 struct fb_info *info = platform_get_drvdata(pdev); 366 367 unregister_framebuffer(info); 368 sysfs_remove_groups(&pdev->dev.kobj, efifb_groups); 369 framebuffer_release(info); 370 371 return 0; 372 } 373 374 static struct platform_driver efifb_driver = { 375 .driver = { 376 .name = "efi-framebuffer", 377 }, 378 .probe = efifb_probe, 379 .remove = efifb_remove, 380 }; 381 382 builtin_platform_driver(efifb_driver); 383 384 #if defined(CONFIG_PCI) 385 386 static void record_efifb_bar_resource(struct pci_dev *dev, int idx, u64 offset) 387 { 388 u16 word; 389 390 efifb_pci_dev = dev; 391 392 pci_read_config_word(dev, PCI_COMMAND, &word); 393 if (!(word & PCI_COMMAND_MEMORY)) { 394 pci_dev_disabled = true; 395 dev_err(&dev->dev, 396 "BAR %d: assigned to efifb but device is disabled!\n", 397 idx); 398 return; 399 } 400 401 bar_resource = &dev->resource[idx]; 402 bar_offset = offset; 403 404 dev_info(&dev->dev, "BAR %d: assigned to efifb\n", idx); 405 } 406 407 static void efifb_fixup_resources(struct pci_dev *dev) 408 { 409 u64 base = screen_info.lfb_base; 410 u64 size = screen_info.lfb_size; 411 int i; 412 413 if (efifb_pci_dev || screen_info.orig_video_isVGA != VIDEO_TYPE_EFI) 414 return; 415 416 if (screen_info.capabilities & VIDEO_CAPABILITY_64BIT_BASE) 417 base |= (u64)screen_info.ext_lfb_base << 32; 418 419 if (!base) 420 return; 421 422 for (i = 0; i <= PCI_STD_RESOURCE_END; i++) { 423 struct resource *res = &dev->resource[i]; 424 425 if (!(res->flags & IORESOURCE_MEM)) 426 continue; 427 428 if (res->start <= base && res->end >= base + size - 1) { 429 record_efifb_bar_resource(dev, i, base - res->start); 430 break; 431 } 432 } 433 } 434 DECLARE_PCI_FIXUP_CLASS_HEADER(PCI_ANY_ID, PCI_ANY_ID, PCI_BASE_CLASS_DISPLAY, 435 16, efifb_fixup_resources); 436 437 #endif 438