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/module.h> 10 #include <linux/kernel.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 <linux/dmi.h> 16 #include <linux/pci.h> 17 #include <video/vga.h> 18 #include <asm/sysfb.h> 19 20 static bool request_mem_succeeded = 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 >>= 8; 56 green >>= 8; 57 blue >>= 8; 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 int i; 89 90 if (options && *options) { 91 while ((this_opt = strsep(&options, ",")) != NULL) { 92 if (!*this_opt) continue; 93 94 for (i = 0; i < M_UNKNOWN; i++) { 95 if (efifb_dmi_list[i].base != 0 && 96 !strcmp(this_opt, efifb_dmi_list[i].optname)) { 97 screen_info.lfb_base = efifb_dmi_list[i].base; 98 screen_info.lfb_linelength = efifb_dmi_list[i].stride; 99 screen_info.lfb_width = efifb_dmi_list[i].width; 100 screen_info.lfb_height = efifb_dmi_list[i].height; 101 } 102 } 103 if (!strncmp(this_opt, "base:", 5)) 104 screen_info.lfb_base = simple_strtoul(this_opt+5, NULL, 0); 105 else if (!strncmp(this_opt, "stride:", 7)) 106 screen_info.lfb_linelength = simple_strtoul(this_opt+7, NULL, 0) * 4; 107 else if (!strncmp(this_opt, "height:", 7)) 108 screen_info.lfb_height = simple_strtoul(this_opt+7, NULL, 0); 109 else if (!strncmp(this_opt, "width:", 6)) 110 screen_info.lfb_width = simple_strtoul(this_opt+6, NULL, 0); 111 } 112 } 113 114 return 0; 115 } 116 117 static int efifb_probe(struct platform_device *dev) 118 { 119 struct fb_info *info; 120 int err; 121 unsigned int size_vmode; 122 unsigned int size_remap; 123 unsigned int size_total; 124 char *option = NULL; 125 126 if (screen_info.orig_video_isVGA != VIDEO_TYPE_EFI) 127 return -ENODEV; 128 129 if (fb_get_options("efifb", &option)) 130 return -ENODEV; 131 efifb_setup(option); 132 133 /* We don't get linelength from UGA Draw Protocol, only from 134 * EFI Graphics Protocol. So if it's not in DMI, and it's not 135 * passed in from the user, we really can't use the framebuffer. 136 */ 137 if (!screen_info.lfb_linelength) 138 return -ENODEV; 139 140 if (!screen_info.lfb_depth) 141 screen_info.lfb_depth = 32; 142 if (!screen_info.pages) 143 screen_info.pages = 1; 144 if (!screen_info.lfb_base) { 145 printk(KERN_DEBUG "efifb: invalid framebuffer address\n"); 146 return -ENODEV; 147 } 148 printk(KERN_INFO "efifb: probing for efifb\n"); 149 150 /* just assume they're all unset if any are */ 151 if (!screen_info.blue_size) { 152 screen_info.blue_size = 8; 153 screen_info.blue_pos = 0; 154 screen_info.green_size = 8; 155 screen_info.green_pos = 8; 156 screen_info.red_size = 8; 157 screen_info.red_pos = 16; 158 screen_info.rsvd_size = 8; 159 screen_info.rsvd_pos = 24; 160 } 161 162 efifb_fix.smem_start = screen_info.lfb_base; 163 efifb_defined.bits_per_pixel = screen_info.lfb_depth; 164 efifb_defined.xres = screen_info.lfb_width; 165 efifb_defined.yres = screen_info.lfb_height; 166 efifb_fix.line_length = screen_info.lfb_linelength; 167 168 /* size_vmode -- that is the amount of memory needed for the 169 * used video mode, i.e. the minimum amount of 170 * memory we need. */ 171 size_vmode = efifb_defined.yres * efifb_fix.line_length; 172 173 /* size_total -- all video memory we have. Used for 174 * entries, ressource allocation and bounds 175 * checking. */ 176 size_total = screen_info.lfb_size; 177 if (size_total < size_vmode) 178 size_total = size_vmode; 179 180 /* size_remap -- the amount of video memory we are going to 181 * use for efifb. With modern cards it is no 182 * option to simply use size_total as that 183 * wastes plenty of kernel address space. */ 184 size_remap = size_vmode * 2; 185 if (size_remap > size_total) 186 size_remap = size_total; 187 if (size_remap % PAGE_SIZE) 188 size_remap += PAGE_SIZE - (size_remap % PAGE_SIZE); 189 efifb_fix.smem_len = size_remap; 190 191 if (request_mem_region(efifb_fix.smem_start, size_remap, "efifb")) { 192 request_mem_succeeded = true; 193 } else { 194 /* We cannot make this fatal. Sometimes this comes from magic 195 spaces our resource handlers simply don't know about */ 196 printk(KERN_WARNING 197 "efifb: cannot reserve video memory at 0x%lx\n", 198 efifb_fix.smem_start); 199 } 200 201 info = framebuffer_alloc(sizeof(u32) * 16, &dev->dev); 202 if (!info) { 203 printk(KERN_ERR "efifb: cannot allocate framebuffer\n"); 204 err = -ENOMEM; 205 goto err_release_mem; 206 } 207 platform_set_drvdata(dev, info); 208 info->pseudo_palette = info->par; 209 info->par = NULL; 210 211 info->apertures = alloc_apertures(1); 212 if (!info->apertures) { 213 err = -ENOMEM; 214 goto err_release_fb; 215 } 216 info->apertures->ranges[0].base = efifb_fix.smem_start; 217 info->apertures->ranges[0].size = size_remap; 218 219 info->screen_base = ioremap_wc(efifb_fix.smem_start, efifb_fix.smem_len); 220 if (!info->screen_base) { 221 printk(KERN_ERR "efifb: abort, cannot ioremap video memory " 222 "0x%x @ 0x%lx\n", 223 efifb_fix.smem_len, efifb_fix.smem_start); 224 err = -EIO; 225 goto err_release_fb; 226 } 227 228 printk(KERN_INFO "efifb: framebuffer at 0x%lx, mapped to 0x%p, " 229 "using %dk, total %dk\n", 230 efifb_fix.smem_start, info->screen_base, 231 size_remap/1024, size_total/1024); 232 printk(KERN_INFO "efifb: mode is %dx%dx%d, linelength=%d, pages=%d\n", 233 efifb_defined.xres, efifb_defined.yres, 234 efifb_defined.bits_per_pixel, efifb_fix.line_length, 235 screen_info.pages); 236 237 efifb_defined.xres_virtual = efifb_defined.xres; 238 efifb_defined.yres_virtual = efifb_fix.smem_len / 239 efifb_fix.line_length; 240 printk(KERN_INFO "efifb: scrolling: redraw\n"); 241 efifb_defined.yres_virtual = efifb_defined.yres; 242 243 /* some dummy values for timing to make fbset happy */ 244 efifb_defined.pixclock = 10000000 / efifb_defined.xres * 245 1000 / efifb_defined.yres; 246 efifb_defined.left_margin = (efifb_defined.xres / 8) & 0xf8; 247 efifb_defined.hsync_len = (efifb_defined.xres / 8) & 0xf8; 248 249 efifb_defined.red.offset = screen_info.red_pos; 250 efifb_defined.red.length = screen_info.red_size; 251 efifb_defined.green.offset = screen_info.green_pos; 252 efifb_defined.green.length = screen_info.green_size; 253 efifb_defined.blue.offset = screen_info.blue_pos; 254 efifb_defined.blue.length = screen_info.blue_size; 255 efifb_defined.transp.offset = screen_info.rsvd_pos; 256 efifb_defined.transp.length = screen_info.rsvd_size; 257 258 printk(KERN_INFO "efifb: %s: " 259 "size=%d:%d:%d:%d, shift=%d:%d:%d:%d\n", 260 "Truecolor", 261 screen_info.rsvd_size, 262 screen_info.red_size, 263 screen_info.green_size, 264 screen_info.blue_size, 265 screen_info.rsvd_pos, 266 screen_info.red_pos, 267 screen_info.green_pos, 268 screen_info.blue_pos); 269 270 efifb_fix.ypanstep = 0; 271 efifb_fix.ywrapstep = 0; 272 273 info->fbops = &efifb_ops; 274 info->var = efifb_defined; 275 info->fix = efifb_fix; 276 info->flags = FBINFO_FLAG_DEFAULT | FBINFO_MISC_FIRMWARE; 277 278 if ((err = fb_alloc_cmap(&info->cmap, 256, 0)) < 0) { 279 printk(KERN_ERR "efifb: cannot allocate colormap\n"); 280 goto err_unmap; 281 } 282 if ((err = register_framebuffer(info)) < 0) { 283 printk(KERN_ERR "efifb: cannot register framebuffer\n"); 284 goto err_fb_dealoc; 285 } 286 fb_info(info, "%s frame buffer device\n", info->fix.id); 287 return 0; 288 289 err_fb_dealoc: 290 fb_dealloc_cmap(&info->cmap); 291 err_unmap: 292 iounmap(info->screen_base); 293 err_release_fb: 294 framebuffer_release(info); 295 err_release_mem: 296 if (request_mem_succeeded) 297 release_mem_region(efifb_fix.smem_start, size_total); 298 return err; 299 } 300 301 static int efifb_remove(struct platform_device *pdev) 302 { 303 struct fb_info *info = platform_get_drvdata(pdev); 304 305 unregister_framebuffer(info); 306 framebuffer_release(info); 307 308 return 0; 309 } 310 311 static struct platform_driver efifb_driver = { 312 .driver = { 313 .name = "efi-framebuffer", 314 .owner = THIS_MODULE, 315 }, 316 .probe = efifb_probe, 317 .remove = efifb_remove, 318 }; 319 320 module_platform_driver(efifb_driver); 321 MODULE_LICENSE("GPL"); 322