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         fb_dealloc_cmap(&info->cmap);
  76         framebuffer_release(info);
  77 }
  78
  79 static struct fb_ops efifb_ops = {
  80         .owner          = THIS_MODULE,
  81         .fb_destroy     = efifb_destroy,
  82         .fb_setcolreg   = efifb_setcolreg,
  83         .fb_fillrect    = cfb_fillrect,
  84         .fb_copyarea    = cfb_copyarea,
  85         .fb_imageblit   = cfb_imageblit,
  86 };
  87
  88 struct pci_dev *vga_default_device(void)
  89 {
  90         return default_vga;
  91 }
  92
  93 EXPORT_SYMBOL_GPL(vga_default_device);
  94
  95 void vga_set_default_device(struct pci_dev *pdev)
  96 {
  97         default_vga = pdev;
  98 }
  99
 100 static int efifb_setup(char *options)
 101 {
 102         char *this_opt;
 103         int i;
 104         struct pci_dev *dev = NULL;
 105
 106         if (options && *options) {
 107                 while ((this_opt = strsep(&options, ",")) != NULL) {
 108                         if (!*this_opt) continue;
 109
 110                         for (i = 0; i < M_UNKNOWN; i++) {
 111                                 if (!strcmp(this_opt, efifb_dmi_list[i].optname) &&
 112                                     efifb_dmi_list[i].base != 0) {
 113                                         screen_info.lfb_base = efifb_dmi_list[i].base;
 114                                         screen_info.lfb_linelength = efifb_dmi_list[i].stride;
 115                                         screen_info.lfb_width = efifb_dmi_list[i].width;
 116                                         screen_info.lfb_height = efifb_dmi_list[i].height;
 117                                 }
 118                         }
 119                         if (!strncmp(this_opt, "base:", 5))
 120                                 screen_info.lfb_base = simple_strtoul(this_opt+5, NULL, 0);
 121                         else if (!strncmp(this_opt, "stride:", 7))
 122                                 screen_info.lfb_linelength = simple_strtoul(this_opt+7, NULL, 0) * 4;
 123                         else if (!strncmp(this_opt, "height:", 7))
 124                                 screen_info.lfb_height = simple_strtoul(this_opt+7, NULL, 0);
 125                         else if (!strncmp(this_opt, "width:", 6))
 126                                 screen_info.lfb_width = simple_strtoul(this_opt+6, NULL, 0);
 127                 }
 128         }
 129
 130         for_each_pci_dev(dev) {
 131                 int i;
 132
 133                 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
 134                         continue;
 135
 136                 for (i=0; i < DEVICE_COUNT_RESOURCE; i++) {
 137                         resource_size_t start, end;
 138
 139                         if (!(pci_resource_flags(dev, i) & IORESOURCE_MEM))
 140                                 continue;
 141
 142                         start = pci_resource_start(dev, i);
 143                         end  = pci_resource_end(dev, i);
 144
 145                         if (!start || !end)
 146                                 continue;
 147
 148                         if (screen_info.lfb_base >= start &&
 149                             (screen_info.lfb_base + screen_info.lfb_size) < end)
 150                                 default_vga = dev;
 151                 }
 152         }
 153
 154         return 0;
 155 }
 156
 157 static int efifb_probe(struct platform_device *dev)
 158 {
 159         struct fb_info *info;
 160         int err;
 161         unsigned int size_vmode;
 162         unsigned int size_remap;
 163         unsigned int size_total;
 164         char *option = NULL;
 165
 166         if (screen_info.orig_video_isVGA != VIDEO_TYPE_EFI)
 167                 return -ENODEV;
 168
 169         if (fb_get_options("efifb", &option))
 170                 return -ENODEV;
 171         efifb_setup(option);
 172
 173         /* We don't get linelength from UGA Draw Protocol, only from
 174          * EFI Graphics Protocol.  So if it's not in DMI, and it's not
 175          * passed in from the user, we really can't use the framebuffer.
 176          */
 177         if (!screen_info.lfb_linelength)
 178                 return -ENODEV;
 179
 180         if (!screen_info.lfb_depth)
 181                 screen_info.lfb_depth = 32;
 182         if (!screen_info.pages)
 183                 screen_info.pages = 1;
 184         if (!screen_info.lfb_base) {
 185                 printk(KERN_DEBUG "efifb: invalid framebuffer address\n");
 186                 return -ENODEV;
 187         }
 188         printk(KERN_INFO "efifb: probing for efifb\n");
 189
 190         /* just assume they're all unset if any are */
 191         if (!screen_info.blue_size) {
 192                 screen_info.blue_size = 8;
 193                 screen_info.blue_pos = 0;
 194                 screen_info.green_size = 8;
 195                 screen_info.green_pos = 8;
 196                 screen_info.red_size = 8;
 197                 screen_info.red_pos = 16;
 198                 screen_info.rsvd_size = 8;
 199                 screen_info.rsvd_pos = 24;
 200         }
 201
 202         efifb_fix.smem_start = screen_info.lfb_base;
 203         efifb_defined.bits_per_pixel = screen_info.lfb_depth;
 204         efifb_defined.xres = screen_info.lfb_width;
 205         efifb_defined.yres = screen_info.lfb_height;
 206         efifb_fix.line_length = screen_info.lfb_linelength;
 207
 208         /*   size_vmode -- that is the amount of memory needed for the
 209          *                 used video mode, i.e. the minimum amount of
 210          *                 memory we need. */
 211         size_vmode = efifb_defined.yres * efifb_fix.line_length;
 212
 213         /*   size_total -- all video memory we have. Used for
 214          *                 entries, ressource allocation and bounds
 215          *                 checking. */
 216         size_total = screen_info.lfb_size;
 217         if (size_total < size_vmode)
 218                 size_total = size_vmode;
 219
 220         /*   size_remap -- the amount of video memory we are going to
 221          *                 use for efifb.  With modern cards it is no
 222          *                 option to simply use size_total as that
 223          *                 wastes plenty of kernel address space. */
 224         size_remap  = size_vmode * 2;
 225         if (size_remap > size_total)
 226                 size_remap = size_total;
 227         if (size_remap % PAGE_SIZE)
 228                 size_remap += PAGE_SIZE - (size_remap % PAGE_SIZE);
 229         efifb_fix.smem_len = size_remap;
 230
 231         if (request_mem_region(efifb_fix.smem_start, size_remap, "efifb")) {
 232                 request_mem_succeeded = true;
 233         } else {
 234                 /* We cannot make this fatal. Sometimes this comes from magic
 235                    spaces our resource handlers simply don't know about */
 236                 printk(KERN_WARNING
 237                        "efifb: cannot reserve video memory at 0x%lx\n",
 238                         efifb_fix.smem_start);
 239         }
 240
 241         info = framebuffer_alloc(sizeof(u32) * 16, &dev->dev);
 242         if (!info) {
 243                 printk(KERN_ERR "efifb: cannot allocate framebuffer\n");
 244                 err = -ENOMEM;
 245                 goto err_release_mem;
 246         }
 247         info->pseudo_palette = info->par;
 248         info->par = NULL;
 249
 250         info->apertures = alloc_apertures(1);
 251         if (!info->apertures) {
 252                 err = -ENOMEM;
 253                 goto err_release_fb;
 254         }
 255         info->apertures->ranges[0].base = efifb_fix.smem_start;
 256         info->apertures->ranges[0].size = size_remap;
 257
 258         info->screen_base = ioremap_wc(efifb_fix.smem_start, efifb_fix.smem_len);
 259         if (!info->screen_base) {
 260                 printk(KERN_ERR "efifb: abort, cannot ioremap video memory "
 261                                 "0x%x @ 0x%lx\n",
 262                         efifb_fix.smem_len, efifb_fix.smem_start);
 263                 err = -EIO;
 264                 goto err_release_fb;
 265         }
 266
 267         printk(KERN_INFO "efifb: framebuffer at 0x%lx, mapped to 0x%p, "
 268                "using %dk, total %dk\n",
 269                efifb_fix.smem_start, info->screen_base,
 270                size_remap/1024, size_total/1024);
 271         printk(KERN_INFO "efifb: mode is %dx%dx%d, linelength=%d, pages=%d\n",
 272                efifb_defined.xres, efifb_defined.yres,
 273                efifb_defined.bits_per_pixel, efifb_fix.line_length,
 274                screen_info.pages);
 275
 276         efifb_defined.xres_virtual = efifb_defined.xres;
 277         efifb_defined.yres_virtual = efifb_fix.smem_len /
 278                                         efifb_fix.line_length;
 279         printk(KERN_INFO "efifb: scrolling: redraw\n");
 280         efifb_defined.yres_virtual = efifb_defined.yres;
 281
 282         /* some dummy values for timing to make fbset happy */
 283         efifb_defined.pixclock     = 10000000 / efifb_defined.xres *
 284                                         1000 / efifb_defined.yres;
 285         efifb_defined.left_margin  = (efifb_defined.xres / 8) & 0xf8;
 286         efifb_defined.hsync_len    = (efifb_defined.xres / 8) & 0xf8;
 287
 288         efifb_defined.red.offset    = screen_info.red_pos;
 289         efifb_defined.red.length    = screen_info.red_size;
 290         efifb_defined.green.offset  = screen_info.green_pos;
 291         efifb_defined.green.length  = screen_info.green_size;
 292         efifb_defined.blue.offset   = screen_info.blue_pos;
 293         efifb_defined.blue.length   = screen_info.blue_size;
 294         efifb_defined.transp.offset = screen_info.rsvd_pos;
 295         efifb_defined.transp.length = screen_info.rsvd_size;
 296
 297         printk(KERN_INFO "efifb: %s: "
 298                "size=%d:%d:%d:%d, shift=%d:%d:%d:%d\n",
 299                "Truecolor",
 300                screen_info.rsvd_size,
 301                screen_info.red_size,
 302                screen_info.green_size,
 303                screen_info.blue_size,
 304                screen_info.rsvd_pos,
 305                screen_info.red_pos,
 306                screen_info.green_pos,
 307                screen_info.blue_pos);
 308
 309         efifb_fix.ypanstep  = 0;
 310         efifb_fix.ywrapstep = 0;
 311
 312         info->fbops = &efifb_ops;
 313         info->var = efifb_defined;
 314         info->fix = efifb_fix;
 315         info->flags = FBINFO_FLAG_DEFAULT | FBINFO_MISC_FIRMWARE;
 316
 317         if ((err = fb_alloc_cmap(&info->cmap, 256, 0)) < 0) {
 318                 printk(KERN_ERR "efifb: cannot allocate colormap\n");
 319                 goto err_unmap;
 320         }
 321         if ((err = register_framebuffer(info)) < 0) {
 322                 printk(KERN_ERR "efifb: cannot register framebuffer\n");
 323                 goto err_fb_dealoc;
 324         }
 325         printk(KERN_INFO "fb%d: %s frame buffer device\n",
 326                 info->node, info->fix.id);
 327         return 0;
 328
 329 err_fb_dealoc:
 330         fb_dealloc_cmap(&info->cmap);
 331 err_unmap:
 332         iounmap(info->screen_base);
 333 err_release_fb:
 334         framebuffer_release(info);
 335 err_release_mem:
 336         if (request_mem_succeeded)
 337                 release_mem_region(efifb_fix.smem_start, size_total);
 338         return err;
 339 }
 340
 341 static struct platform_driver efifb_driver = {
 342         .driver = {
 343                 .name = "efi-framebuffer",
 344                 .owner = THIS_MODULE,
 345         },
 346         .probe = efifb_probe,
 347 };
 348
 349 module_platform_driver(efifb_driver);
 350 MODULE_LICENSE("GPL");