drivers/video/efifb.c

   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 pci_dev *default_vga;
  23
  24 static struct fb_var_screeninfo efifb_defined = {
  25         .activate               = FB_ACTIVATE_NOW,
  26         .height                 = -1,
  27         .width                  = -1,
  28         .right_margin           = 32,
  29         .upper_margin           = 16,
  30         .lower_margin           = 4,
  31         .vsync_len              = 4,
  32         .vmode                  = FB_VMODE_NONINTERLACED,
  33 };
  34
  35 static struct fb_fix_screeninfo efifb_fix = {
  36         .id                     = "EFI VGA",
  37         .type                   = FB_TYPE_PACKED_PIXELS,
  38         .accel                  = FB_ACCEL_NONE,
  39         .visual                 = FB_VISUAL_TRUECOLOR,
  40 };
  41
  42 static int efifb_setcolreg(unsigned regno, unsigned red, unsigned green,
  43                            unsigned blue, unsigned transp,
  44                            struct fb_info *info)
  45 {
  46         /*
  47          *  Set a single color register. The values supplied are
  48          *  already rounded down to the hardware's capabilities
  49          *  (according to the entries in the `var' structure). Return
  50          *  != 0 for invalid regno.
  51          */
  52
  53         if (regno >= info->cmap.len)
  54                 return 1;
  55
  56         if (regno < 16) {
  57                 red   >>= 8;
  58                 green >>= 8;
  59                 blue  >>= 8;
  60                 ((u32 *)(info->pseudo_palette))[regno] =
  61                         (red   << info->var.red.offset)   |
  62                         (green << info->var.green.offset) |
  63                         (blue  << info->var.blue.offset);
  64         }
  65         return 0;
  66 }
  67
  68 static void efifb_destroy(struct fb_info *info)
  69 {
  70         if (info->screen_base)
  71                 iounmap(info->screen_base);
  72         if (request_mem_succeeded)
  73                 release_mem_region(info->apertures->ranges[0].base,
  74                                    info->apertures->ranges[0].size);
  75         framebuffer_release(info);
  76 }
  77
  78 static struct fb_ops efifb_ops = {
  79         .owner          = THIS_MODULE,
  80         .fb_destroy     = efifb_destroy,
  81         .fb_setcolreg   = efifb_setcolreg,
  82         .fb_fillrect    = cfb_fillrect,
  83         .fb_copyarea    = cfb_copyarea,
  84         .fb_imageblit   = cfb_imageblit,
  85 };
  86
  87 struct pci_dev *vga_default_device(void)
  88 {
  89         return default_vga;
  90 }
  91
  92 EXPORT_SYMBOL_GPL(vga_default_device);
  93
  94 void vga_set_default_device(struct pci_dev *pdev)
  95 {
  96         default_vga = pdev;
  97 }
  98
  99 static int efifb_setup(char *options)
 100 {
 101         char *this_opt;
 102         int i;
 103         struct pci_dev *dev = NULL;
 104
 105         if (options && *options) {
 106                 while ((this_opt = strsep(&options, ",")) != NULL) {
 107                         if (!*this_opt) continue;
 108
 109                         for (i = 0; i < M_UNKNOWN; i++) {
 110                                 if (!strcmp(this_opt, efifb_dmi_list[i].optname) &&
 111                                     efifb_dmi_list[i].base != 0) {
 112                                         screen_info.lfb_base = efifb_dmi_list[i].base;
 113                                         screen_info.lfb_linelength = efifb_dmi_list[i].stride;
 114                                         screen_info.lfb_width = efifb_dmi_list[i].width;
 115                                         screen_info.lfb_height = efifb_dmi_list[i].height;
 116                                 }
 117                         }
 118                         if (!strncmp(this_opt, "base:", 5))
 119                                 screen_info.lfb_base = simple_strtoul(this_opt+5, NULL, 0);
 120                         else if (!strncmp(this_opt, "stride:", 7))
 121                                 screen_info.lfb_linelength = simple_strtoul(this_opt+7, NULL, 0) * 4;
 122                         else if (!strncmp(this_opt, "height:", 7))
 123                                 screen_info.lfb_height = simple_strtoul(this_opt+7, NULL, 0);
 124                         else if (!strncmp(this_opt, "width:", 6))
 125                                 screen_info.lfb_width = simple_strtoul(this_opt+6, NULL, 0);
 126                 }
 127         }
 128
 129         for_each_pci_dev(dev) {
 130                 int i;
 131
 132                 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
 133                         continue;
 134
 135                 for (i=0; i < DEVICE_COUNT_RESOURCE; i++) {
 136                         resource_size_t start, end;
 137
 138                         if (!(pci_resource_flags(dev, i) & IORESOURCE_MEM))
 139                                 continue;
 140
 141                         start = pci_resource_start(dev, i);
 142                         end  = pci_resource_end(dev, i);
 143
 144                         if (!start || !end)
 145                                 continue;
 146
 147                         if (screen_info.lfb_base >= start &&
 148                             (screen_info.lfb_base + screen_info.lfb_size) < end)
 149                                 default_vga = dev;
 150                 }
 151         }
 152
 153         return 0;
 154 }
 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)
 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 (!screen_info.lfb_base) {
 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         efifb_defined.bits_per_pixel = screen_info.lfb_depth;
 203         efifb_defined.xres = screen_info.lfb_width;
 204         efifb_defined.yres = screen_info.lfb_height;
 205         efifb_fix.line_length = screen_info.lfb_linelength;
 206
 207         /*   size_vmode -- that is the amount of memory needed for the
 208          *                 used video mode, i.e. the minimum amount of
 209          *                 memory we need. */
 210         size_vmode = efifb_defined.yres * efifb_fix.line_length;
 211
 212         /*   size_total -- all video memory we have. Used for
 213          *                 entries, ressource allocation and bounds
 214          *                 checking. */
 215         size_total = screen_info.lfb_size;
 216         if (size_total < size_vmode)
 217                 size_total = size_vmode;
 218
 219         /*   size_remap -- the amount of video memory we are going to
 220          *                 use for efifb.  With modern cards it is no
 221          *                 option to simply use size_total as that
 222          *                 wastes plenty of kernel address space. */
 223         size_remap  = size_vmode * 2;
 224         if (size_remap > size_total)
 225                 size_remap = size_total;
 226         if (size_remap % PAGE_SIZE)
 227                 size_remap += PAGE_SIZE - (size_remap % PAGE_SIZE);
 228         efifb_fix.smem_len = size_remap;
 229
 230         if (request_mem_region(efifb_fix.smem_start, size_remap, "efifb")) {
 231                 request_mem_succeeded = true;
 232         } else {
 233                 /* We cannot make this fatal. Sometimes this comes from magic
 234                    spaces our resource handlers simply don't know about */
 235                 printk(KERN_WARNING
 236                        "efifb: cannot reserve video memory at 0x%lx\n",
 237                         efifb_fix.smem_start);
 238         }
 239
 240         info = framebuffer_alloc(sizeof(u32) * 16, &dev->dev);
 241         if (!info) {
 242                 printk(KERN_ERR "efifb: cannot allocate framebuffer\n");
 243                 err = -ENOMEM;
 244                 goto err_release_mem;
 245         }
 246         info->pseudo_palette = info->par;
 247         info->par = NULL;
 248
 249         info->apertures = alloc_apertures(1);
 250         if (!info->apertures) {
 251                 err = -ENOMEM;
 252                 goto err_release_fb;
 253         }
 254         info->apertures->ranges[0].base = efifb_fix.smem_start;
 255         info->apertures->ranges[0].size = size_remap;
 256
 257         info->screen_base = ioremap_wc(efifb_fix.smem_start, efifb_fix.smem_len);
 258         if (!info->screen_base) {
 259                 printk(KERN_ERR "efifb: abort, cannot ioremap video memory "
 260                                 "0x%x @ 0x%lx\n",
 261                         efifb_fix.smem_len, efifb_fix.smem_start);
 262                 err = -EIO;
 263                 goto err_release_fb;
 264         }
 265
 266         printk(KERN_INFO "efifb: framebuffer at 0x%lx, mapped to 0x%p, "
 267                "using %dk, total %dk\n",
 268                efifb_fix.smem_start, info->screen_base,
 269                size_remap/1024, size_total/1024);
 270         printk(KERN_INFO "efifb: mode is %dx%dx%d, linelength=%d, pages=%d\n",
 271                efifb_defined.xres, efifb_defined.yres,
 272                efifb_defined.bits_per_pixel, efifb_fix.line_length,
 273                screen_info.pages);
 274
 275         efifb_defined.xres_virtual = efifb_defined.xres;
 276         efifb_defined.yres_virtual = efifb_fix.smem_len /
 277                                         efifb_fix.line_length;
 278         printk(KERN_INFO "efifb: scrolling: redraw\n");
 279         efifb_defined.yres_virtual = efifb_defined.yres;
 280
 281         /* some dummy values for timing to make fbset happy */
 282         efifb_defined.pixclock     = 10000000 / efifb_defined.xres *
 283                                         1000 / efifb_defined.yres;
 284         efifb_defined.left_margin  = (efifb_defined.xres / 8) & 0xf8;
 285         efifb_defined.hsync_len    = (efifb_defined.xres / 8) & 0xf8;
 286
 287         efifb_defined.red.offset    = screen_info.red_pos;
 288         efifb_defined.red.length    = screen_info.red_size;
 289         efifb_defined.green.offset  = screen_info.green_pos;
 290         efifb_defined.green.length  = screen_info.green_size;
 291         efifb_defined.blue.offset   = screen_info.blue_pos;
 292         efifb_defined.blue.length   = screen_info.blue_size;
 293         efifb_defined.transp.offset = screen_info.rsvd_pos;
 294         efifb_defined.transp.length = screen_info.rsvd_size;
 295
 296         printk(KERN_INFO "efifb: %s: "
 297                "size=%d:%d:%d:%d, shift=%d:%d:%d:%d\n",
 298                "Truecolor",
 299                screen_info.rsvd_size,
 300                screen_info.red_size,
 301                screen_info.green_size,
 302                screen_info.blue_size,
 303                screen_info.rsvd_pos,
 304                screen_info.red_pos,
 305                screen_info.green_pos,
 306                screen_info.blue_pos);
 307
 308         efifb_fix.ypanstep  = 0;
 309         efifb_fix.ywrapstep = 0;
 310
 311         info->fbops = &efifb_ops;
 312         info->var = efifb_defined;
 313         info->fix = efifb_fix;
 314         info->flags = FBINFO_FLAG_DEFAULT | FBINFO_MISC_FIRMWARE;
 315
 316         if ((err = fb_alloc_cmap(&info->cmap, 256, 0)) < 0) {
 317                 printk(KERN_ERR "efifb: cannot allocate colormap\n");
 318                 goto err_unmap;
 319         }
 320         if ((err = register_framebuffer(info)) < 0) {
 321                 printk(KERN_ERR "efifb: cannot register framebuffer\n");
 322                 goto err_fb_dealoc;
 323         }
 324         printk(KERN_INFO "fb%d: %s frame buffer device\n",
 325                 info->node, info->fix.id);
 326         return 0;
 327
 328 err_fb_dealoc:
 329         fb_dealloc_cmap(&info->cmap);
 330 err_unmap:
 331         iounmap(info->screen_base);
 332 err_release_fb:
 333         framebuffer_release(info);
 334 err_release_mem:
 335         if (request_mem_succeeded)
 336                 release_mem_region(efifb_fix.smem_start, size_total);
 337         return err;
 338 }
 339
 340 static struct platform_driver efifb_driver = {
 341         .driver = {
 342                 .name = "efi-framebuffer",
 343                 .owner = THIS_MODULE,
 344         },
 345         .probe = efifb_probe,
 346 };
 347
 348 module_platform_driver(efifb_driver);
 349 MODULE_LICENSE("GPL");