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/platform_device.h> 14 #include <linux/screen_info.h> 15 #include <video/vga.h> 16 #include <asm/efi.h> 17 18 static bool request_mem_succeeded = false; 19 20 static struct fb_var_screeninfo efifb_defined = { 21 .activate = FB_ACTIVATE_NOW, 22 .height = -1, 23 .width = -1, 24 .right_margin = 32, 25 .upper_margin = 16, 26 .lower_margin = 4, 27 .vsync_len = 4, 28 .vmode = FB_VMODE_NONINTERLACED, 29 }; 30 31 static struct fb_fix_screeninfo efifb_fix = { 32 .id = "EFI VGA", 33 .type = FB_TYPE_PACKED_PIXELS, 34 .accel = FB_ACCEL_NONE, 35 .visual = FB_VISUAL_TRUECOLOR, 36 }; 37 38 static int efifb_setcolreg(unsigned regno, unsigned red, unsigned green, 39 unsigned blue, unsigned transp, 40 struct fb_info *info) 41 { 42 /* 43 * Set a single color register. The values supplied are 44 * already rounded down to the hardware's capabilities 45 * (according to the entries in the `var' structure). Return 46 * != 0 for invalid regno. 47 */ 48 49 if (regno >= info->cmap.len) 50 return 1; 51 52 if (regno < 16) { 53 red >>= 16 - info->var.red.length; 54 green >>= 16 - info->var.green.length; 55 blue >>= 16 - info->var.blue.length; 56 ((u32 *)(info->pseudo_palette))[regno] = 57 (red << info->var.red.offset) | 58 (green << info->var.green.offset) | 59 (blue << info->var.blue.offset); 60 } 61 return 0; 62 } 63 64 static void efifb_destroy(struct fb_info *info) 65 { 66 if (info->screen_base) 67 iounmap(info->screen_base); 68 if (request_mem_succeeded) 69 release_mem_region(info->apertures->ranges[0].base, 70 info->apertures->ranges[0].size); 71 fb_dealloc_cmap(&info->cmap); 72 } 73 74 static struct fb_ops efifb_ops = { 75 .owner = THIS_MODULE, 76 .fb_destroy = efifb_destroy, 77 .fb_setcolreg = efifb_setcolreg, 78 .fb_fillrect = cfb_fillrect, 79 .fb_copyarea = cfb_copyarea, 80 .fb_imageblit = cfb_imageblit, 81 }; 82 83 static int efifb_setup(char *options) 84 { 85 char *this_opt; 86 87 if (options && *options) { 88 while ((this_opt = strsep(&options, ",")) != NULL) { 89 if (!*this_opt) continue; 90 91 efifb_setup_from_dmi(&screen_info, this_opt); 92 93 if (!strncmp(this_opt, "base:", 5)) 94 screen_info.lfb_base = simple_strtoul(this_opt+5, NULL, 0); 95 else if (!strncmp(this_opt, "stride:", 7)) 96 screen_info.lfb_linelength = simple_strtoul(this_opt+7, NULL, 0) * 4; 97 else if (!strncmp(this_opt, "height:", 7)) 98 screen_info.lfb_height = simple_strtoul(this_opt+7, NULL, 0); 99 else if (!strncmp(this_opt, "width:", 6)) 100 screen_info.lfb_width = simple_strtoul(this_opt+6, NULL, 0); 101 } 102 } 103 104 return 0; 105 } 106 107 static inline bool fb_base_is_valid(void) 108 { 109 if (screen_info.lfb_base) 110 return true; 111 112 if (!(screen_info.capabilities & VIDEO_CAPABILITY_64BIT_BASE)) 113 return false; 114 115 if (screen_info.ext_lfb_base) 116 return true; 117 118 return false; 119 } 120 121 static int efifb_probe(struct platform_device *dev) 122 { 123 struct fb_info *info; 124 int err; 125 unsigned int size_vmode; 126 unsigned int size_remap; 127 unsigned int size_total; 128 char *option = NULL; 129 130 if (screen_info.orig_video_isVGA != VIDEO_TYPE_EFI) 131 return -ENODEV; 132 133 if (fb_get_options("efifb", &option)) 134 return -ENODEV; 135 efifb_setup(option); 136 137 /* We don't get linelength from UGA Draw Protocol, only from 138 * EFI Graphics Protocol. So if it's not in DMI, and it's not 139 * passed in from the user, we really can't use the framebuffer. 140 */ 141 if (!screen_info.lfb_linelength) 142 return -ENODEV; 143 144 if (!screen_info.lfb_depth) 145 screen_info.lfb_depth = 32; 146 if (!screen_info.pages) 147 screen_info.pages = 1; 148 if (!fb_base_is_valid()) { 149 printk(KERN_DEBUG "efifb: invalid framebuffer address\n"); 150 return -ENODEV; 151 } 152 printk(KERN_INFO "efifb: probing for efifb\n"); 153 154 /* just assume they're all unset if any are */ 155 if (!screen_info.blue_size) { 156 screen_info.blue_size = 8; 157 screen_info.blue_pos = 0; 158 screen_info.green_size = 8; 159 screen_info.green_pos = 8; 160 screen_info.red_size = 8; 161 screen_info.red_pos = 16; 162 screen_info.rsvd_size = 8; 163 screen_info.rsvd_pos = 24; 164 } 165 166 efifb_fix.smem_start = screen_info.lfb_base; 167 168 if (screen_info.capabilities & VIDEO_CAPABILITY_64BIT_BASE) { 169 u64 ext_lfb_base; 170 171 ext_lfb_base = (u64)(unsigned long)screen_info.ext_lfb_base << 32; 172 efifb_fix.smem_start |= ext_lfb_base; 173 } 174 175 efifb_defined.bits_per_pixel = screen_info.lfb_depth; 176 efifb_defined.xres = screen_info.lfb_width; 177 efifb_defined.yres = screen_info.lfb_height; 178 efifb_fix.line_length = screen_info.lfb_linelength; 179 180 /* size_vmode -- that is the amount of memory needed for the 181 * used video mode, i.e. the minimum amount of 182 * memory we need. */ 183 size_vmode = efifb_defined.yres * efifb_fix.line_length; 184 185 /* size_total -- all video memory we have. Used for 186 * entries, ressource allocation and bounds 187 * checking. */ 188 size_total = screen_info.lfb_size; 189 if (size_total < size_vmode) 190 size_total = size_vmode; 191 192 /* size_remap -- the amount of video memory we are going to 193 * use for efifb. With modern cards it is no 194 * option to simply use size_total as that 195 * wastes plenty of kernel address space. */ 196 size_remap = size_vmode * 2; 197 if (size_remap > size_total) 198 size_remap = size_total; 199 if (size_remap % PAGE_SIZE) 200 size_remap += PAGE_SIZE - (size_remap % PAGE_SIZE); 201 efifb_fix.smem_len = size_remap; 202 203 if (request_mem_region(efifb_fix.smem_start, size_remap, "efifb")) { 204 request_mem_succeeded = true; 205 } else { 206 /* We cannot make this fatal. Sometimes this comes from magic 207 spaces our resource handlers simply don't know about */ 208 printk(KERN_WARNING 209 "efifb: cannot reserve video memory at 0x%lx\n", 210 efifb_fix.smem_start); 211 } 212 213 info = framebuffer_alloc(sizeof(u32) * 16, &dev->dev); 214 if (!info) { 215 printk(KERN_ERR "efifb: cannot allocate framebuffer\n"); 216 err = -ENOMEM; 217 goto err_release_mem; 218 } 219 platform_set_drvdata(dev, info); 220 info->pseudo_palette = info->par; 221 info->par = NULL; 222 223 info->apertures = alloc_apertures(1); 224 if (!info->apertures) { 225 err = -ENOMEM; 226 goto err_release_fb; 227 } 228 info->apertures->ranges[0].base = efifb_fix.smem_start; 229 info->apertures->ranges[0].size = size_remap; 230 231 info->screen_base = ioremap_wc(efifb_fix.smem_start, efifb_fix.smem_len); 232 if (!info->screen_base) { 233 printk(KERN_ERR "efifb: abort, cannot ioremap video memory " 234 "0x%x @ 0x%lx\n", 235 efifb_fix.smem_len, efifb_fix.smem_start); 236 err = -EIO; 237 goto err_release_fb; 238 } 239 240 printk(KERN_INFO "efifb: framebuffer at 0x%lx, using %dk, total %dk\n", 241 efifb_fix.smem_start, size_remap/1024, size_total/1024); 242 printk(KERN_INFO "efifb: mode is %dx%dx%d, linelength=%d, pages=%d\n", 243 efifb_defined.xres, efifb_defined.yres, 244 efifb_defined.bits_per_pixel, efifb_fix.line_length, 245 screen_info.pages); 246 247 efifb_defined.xres_virtual = efifb_defined.xres; 248 efifb_defined.yres_virtual = efifb_fix.smem_len / 249 efifb_fix.line_length; 250 printk(KERN_INFO "efifb: scrolling: redraw\n"); 251 efifb_defined.yres_virtual = efifb_defined.yres; 252 253 /* some dummy values for timing to make fbset happy */ 254 efifb_defined.pixclock = 10000000 / efifb_defined.xres * 255 1000 / efifb_defined.yres; 256 efifb_defined.left_margin = (efifb_defined.xres / 8) & 0xf8; 257 efifb_defined.hsync_len = (efifb_defined.xres / 8) & 0xf8; 258 259 efifb_defined.red.offset = screen_info.red_pos; 260 efifb_defined.red.length = screen_info.red_size; 261 efifb_defined.green.offset = screen_info.green_pos; 262 efifb_defined.green.length = screen_info.green_size; 263 efifb_defined.blue.offset = screen_info.blue_pos; 264 efifb_defined.blue.length = screen_info.blue_size; 265 efifb_defined.transp.offset = screen_info.rsvd_pos; 266 efifb_defined.transp.length = screen_info.rsvd_size; 267 268 printk(KERN_INFO "efifb: %s: " 269 "size=%d:%d:%d:%d, shift=%d:%d:%d:%d\n", 270 "Truecolor", 271 screen_info.rsvd_size, 272 screen_info.red_size, 273 screen_info.green_size, 274 screen_info.blue_size, 275 screen_info.rsvd_pos, 276 screen_info.red_pos, 277 screen_info.green_pos, 278 screen_info.blue_pos); 279 280 efifb_fix.ypanstep = 0; 281 efifb_fix.ywrapstep = 0; 282 283 info->fbops = &efifb_ops; 284 info->var = efifb_defined; 285 info->fix = efifb_fix; 286 info->flags = FBINFO_FLAG_DEFAULT | FBINFO_MISC_FIRMWARE; 287 288 if ((err = fb_alloc_cmap(&info->cmap, 256, 0)) < 0) { 289 printk(KERN_ERR "efifb: cannot allocate colormap\n"); 290 goto err_unmap; 291 } 292 if ((err = register_framebuffer(info)) < 0) { 293 printk(KERN_ERR "efifb: cannot register framebuffer\n"); 294 goto err_fb_dealoc; 295 } 296 fb_info(info, "%s frame buffer device\n", info->fix.id); 297 return 0; 298 299 err_fb_dealoc: 300 fb_dealloc_cmap(&info->cmap); 301 err_unmap: 302 iounmap(info->screen_base); 303 err_release_fb: 304 framebuffer_release(info); 305 err_release_mem: 306 if (request_mem_succeeded) 307 release_mem_region(efifb_fix.smem_start, size_total); 308 return err; 309 } 310 311 static int efifb_remove(struct platform_device *pdev) 312 { 313 struct fb_info *info = platform_get_drvdata(pdev); 314 315 unregister_framebuffer(info); 316 framebuffer_release(info); 317 318 return 0; 319 } 320 321 static struct platform_driver efifb_driver = { 322 .driver = { 323 .name = "efi-framebuffer", 324 }, 325 .probe = efifb_probe, 326 .remove = efifb_remove, 327 }; 328 329 builtin_platform_driver(efifb_driver); 330