drivers/video/fbdev/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/efi.h>
  12 #include <linux/errno.h>
  13 #include <linux/fb.h>
  14 #include <linux/platform_device.h>
  15 #include <linux/screen_info.h>
  16 #include <linux/dmi.h>
  17 #include <linux/pci.h>
  18 #include <video/vga.h>
  19 #include <asm/efi.h>
  20
  21 static bool request_mem_succeeded = false;
  22
  23 static struct fb_var_screeninfo efifb_defined = {
  24         .activate               = FB_ACTIVATE_NOW,
  25         .height                 = -1,
  26         .width                  = -1,
  27         .right_margin           = 32,
  28         .upper_margin           = 16,
  29         .lower_margin           = 4,
  30         .vsync_len              = 4,
  31         .vmode                  = FB_VMODE_NONINTERLACED,
  32 };
  33
  34 static struct fb_fix_screeninfo efifb_fix = {
  35         .id                     = "EFI VGA",
  36         .type                   = FB_TYPE_PACKED_PIXELS,
  37         .accel                  = FB_ACCEL_NONE,
  38         .visual                 = FB_VISUAL_TRUECOLOR,
  39 };
  40
  41 static int efifb_setcolreg(unsigned regno, unsigned red, unsigned green,
  42                            unsigned blue, unsigned transp,
  43                            struct fb_info *info)
  44 {
  45         /*
  46          *  Set a single color register. The values supplied are
  47          *  already rounded down to the hardware's capabilities
  48          *  (according to the entries in the `var' structure). Return
  49          *  != 0 for invalid regno.
  50          */
  51
  52         if (regno >= info->cmap.len)
  53                 return 1;
  54
  55         if (regno < 16) {
  56                 red   >>= 8;
  57                 green >>= 8;
  58                 blue  >>= 8;
  59                 ((u32 *)(info->pseudo_palette))[regno] =
  60                         (red   << info->var.red.offset)   |
  61                         (green << info->var.green.offset) |
  62                         (blue  << info->var.blue.offset);
  63         }
  64         return 0;
  65 }
  66
  67 static void efifb_destroy(struct fb_info *info)
  68 {
  69         if (info->screen_base)
  70                 iounmap(info->screen_base);
  71         if (request_mem_succeeded)
  72                 release_mem_region(info->apertures->ranges[0].base,
  73                                    info->apertures->ranges[0].size);
  74         fb_dealloc_cmap(&info->cmap);
  75 }
  76
  77 static struct fb_ops efifb_ops = {
  78         .owner          = THIS_MODULE,
  79         .fb_destroy     = efifb_destroy,
  80         .fb_setcolreg   = efifb_setcolreg,
  81         .fb_fillrect    = cfb_fillrect,
  82         .fb_copyarea    = cfb_copyarea,
  83         .fb_imageblit   = cfb_imageblit,
  84 };
  85
  86 static int efifb_setup(char *options)
  87 {
  88         char *this_opt;
  89
  90         if (options && *options) {
  91                 while ((this_opt = strsep(&options, ",")) != NULL) {
  92                         if (!*this_opt) continue;
  93
  94                         efifb_setup_from_dmi(&screen_info, this_opt);
  95
  96                         if (!strncmp(this_opt, "base:", 5))
  97                                 screen_info.lfb_base = simple_strtoul(this_opt+5, NULL, 0);
  98                         else if (!strncmp(this_opt, "stride:", 7))
  99                                 screen_info.lfb_linelength = simple_strtoul(this_opt+7, NULL, 0) * 4;
 100                         else if (!strncmp(this_opt, "height:", 7))
 101                                 screen_info.lfb_height = simple_strtoul(this_opt+7, NULL, 0);
 102                         else if (!strncmp(this_opt, "width:", 6))
 103                                 screen_info.lfb_width = simple_strtoul(this_opt+6, NULL, 0);
 104                 }
 105         }
 106
 107         return 0;
 108 }
 109
 110 static inline bool fb_base_is_valid(void)
 111 {
 112         if (screen_info.lfb_base)
 113                 return true;
 114
 115         if (!(screen_info.capabilities & VIDEO_CAPABILITY_64BIT_BASE))
 116                 return false;
 117
 118         if (screen_info.ext_lfb_base)
 119                 return true;
 120
 121         return false;
 122 }
 123
 124 static int efifb_probe(struct platform_device *dev)
 125 {
 126         struct fb_info *info;
 127         int err;
 128         unsigned int size_vmode;
 129         unsigned int size_remap;
 130         unsigned int size_total;
 131         char *option = NULL;
 132
 133         if (screen_info.orig_video_isVGA != VIDEO_TYPE_EFI)
 134                 return -ENODEV;
 135
 136         if (fb_get_options("efifb", &option))
 137                 return -ENODEV;
 138         efifb_setup(option);
 139
 140         /* We don't get linelength from UGA Draw Protocol, only from
 141          * EFI Graphics Protocol.  So if it's not in DMI, and it's not
 142          * passed in from the user, we really can't use the framebuffer.
 143          */
 144         if (!screen_info.lfb_linelength)
 145                 return -ENODEV;
 146
 147         if (!screen_info.lfb_depth)
 148                 screen_info.lfb_depth = 32;
 149         if (!screen_info.pages)
 150                 screen_info.pages = 1;
 151         if (!fb_base_is_valid()) {
 152                 printk(KERN_DEBUG "efifb: invalid framebuffer address\n");
 153                 return -ENODEV;
 154         }
 155         printk(KERN_INFO "efifb: probing for efifb\n");
 156
 157         /* just assume they're all unset if any are */
 158         if (!screen_info.blue_size) {
 159                 screen_info.blue_size = 8;
 160                 screen_info.blue_pos = 0;
 161                 screen_info.green_size = 8;
 162                 screen_info.green_pos = 8;
 163                 screen_info.red_size = 8;
 164                 screen_info.red_pos = 16;
 165                 screen_info.rsvd_size = 8;
 166                 screen_info.rsvd_pos = 24;
 167         }
 168
 169         efifb_fix.smem_start = screen_info.lfb_base;
 170
 171         if (screen_info.capabilities & VIDEO_CAPABILITY_64BIT_BASE) {
 172                 u64 ext_lfb_base;
 173
 174                 ext_lfb_base = (u64)(unsigned long)screen_info.ext_lfb_base << 32;
 175                 efifb_fix.smem_start |= ext_lfb_base;
 176         }
 177
 178         efifb_defined.bits_per_pixel = screen_info.lfb_depth;
 179         efifb_defined.xres = screen_info.lfb_width;
 180         efifb_defined.yres = screen_info.lfb_height;
 181         efifb_fix.line_length = screen_info.lfb_linelength;
 182
 183         /*   size_vmode -- that is the amount of memory needed for the
 184          *                 used video mode, i.e. the minimum amount of
 185          *                 memory we need. */
 186         size_vmode = efifb_defined.yres * efifb_fix.line_length;
 187
 188         /*   size_total -- all video memory we have. Used for
 189          *                 entries, ressource allocation and bounds
 190          *                 checking. */
 191         size_total = screen_info.lfb_size;
 192         if (size_total < size_vmode)
 193                 size_total = size_vmode;
 194
 195         /*   size_remap -- the amount of video memory we are going to
 196          *                 use for efifb.  With modern cards it is no
 197          *                 option to simply use size_total as that
 198          *                 wastes plenty of kernel address space. */
 199         size_remap  = size_vmode * 2;
 200         if (size_remap > size_total)
 201                 size_remap = size_total;
 202         if (size_remap % PAGE_SIZE)
 203                 size_remap += PAGE_SIZE - (size_remap % PAGE_SIZE);
 204         efifb_fix.smem_len = size_remap;
 205
 206         if (request_mem_region(efifb_fix.smem_start, size_remap, "efifb")) {
 207                 request_mem_succeeded = true;
 208         } else {
 209                 /* We cannot make this fatal. Sometimes this comes from magic
 210                    spaces our resource handlers simply don't know about */
 211                 printk(KERN_WARNING
 212                        "efifb: cannot reserve video memory at 0x%lx\n",
 213                         efifb_fix.smem_start);
 214         }
 215
 216         info = framebuffer_alloc(sizeof(u32) * 16, &dev->dev);
 217         if (!info) {
 218                 printk(KERN_ERR "efifb: cannot allocate framebuffer\n");
 219                 err = -ENOMEM;
 220                 goto err_release_mem;
 221         }
 222         platform_set_drvdata(dev, info);
 223         info->pseudo_palette = info->par;
 224         info->par = NULL;
 225
 226         info->apertures = alloc_apertures(1);
 227         if (!info->apertures) {
 228                 err = -ENOMEM;
 229                 goto err_release_fb;
 230         }
 231         info->apertures->ranges[0].base = efifb_fix.smem_start;
 232         info->apertures->ranges[0].size = size_remap;
 233
 234         info->screen_base = ioremap_wc(efifb_fix.smem_start, efifb_fix.smem_len);
 235         if (!info->screen_base) {
 236                 printk(KERN_ERR "efifb: abort, cannot ioremap video memory "
 237                                 "0x%x @ 0x%lx\n",
 238                         efifb_fix.smem_len, efifb_fix.smem_start);
 239                 err = -EIO;
 240                 goto err_release_fb;
 241         }
 242
 243         printk(KERN_INFO "efifb: framebuffer at 0x%lx, mapped to 0x%p, "
 244                "using %dk, total %dk\n",
 245                efifb_fix.smem_start, info->screen_base,
 246                size_remap/1024, size_total/1024);
 247         printk(KERN_INFO "efifb: mode is %dx%dx%d, linelength=%d, pages=%d\n",
 248                efifb_defined.xres, efifb_defined.yres,
 249                efifb_defined.bits_per_pixel, efifb_fix.line_length,
 250                screen_info.pages);
 251
 252         efifb_defined.xres_virtual = efifb_defined.xres;
 253         efifb_defined.yres_virtual = efifb_fix.smem_len /
 254                                         efifb_fix.line_length;
 255         printk(KERN_INFO "efifb: scrolling: redraw\n");
 256         efifb_defined.yres_virtual = efifb_defined.yres;
 257
 258         /* some dummy values for timing to make fbset happy */
 259         efifb_defined.pixclock     = 10000000 / efifb_defined.xres *
 260                                         1000 / efifb_defined.yres;
 261         efifb_defined.left_margin  = (efifb_defined.xres / 8) & 0xf8;
 262         efifb_defined.hsync_len    = (efifb_defined.xres / 8) & 0xf8;
 263
 264         efifb_defined.red.offset    = screen_info.red_pos;
 265         efifb_defined.red.length    = screen_info.red_size;
 266         efifb_defined.green.offset  = screen_info.green_pos;
 267         efifb_defined.green.length  = screen_info.green_size;
 268         efifb_defined.blue.offset   = screen_info.blue_pos;
 269         efifb_defined.blue.length   = screen_info.blue_size;
 270         efifb_defined.transp.offset = screen_info.rsvd_pos;
 271         efifb_defined.transp.length = screen_info.rsvd_size;
 272
 273         printk(KERN_INFO "efifb: %s: "
 274                "size=%d:%d:%d:%d, shift=%d:%d:%d:%d\n",
 275                "Truecolor",
 276                screen_info.rsvd_size,
 277                screen_info.red_size,
 278                screen_info.green_size,
 279                screen_info.blue_size,
 280                screen_info.rsvd_pos,
 281                screen_info.red_pos,
 282                screen_info.green_pos,
 283                screen_info.blue_pos);
 284
 285         efifb_fix.ypanstep  = 0;
 286         efifb_fix.ywrapstep = 0;
 287
 288         info->fbops = &efifb_ops;
 289         info->var = efifb_defined;
 290         info->fix = efifb_fix;
 291         info->flags = FBINFO_FLAG_DEFAULT | FBINFO_MISC_FIRMWARE;
 292
 293         if ((err = fb_alloc_cmap(&info->cmap, 256, 0)) < 0) {
 294                 printk(KERN_ERR "efifb: cannot allocate colormap\n");
 295                 goto err_unmap;
 296         }
 297         if ((err = register_framebuffer(info)) < 0) {
 298                 printk(KERN_ERR "efifb: cannot register framebuffer\n");
 299                 goto err_fb_dealoc;
 300         }
 301         fb_info(info, "%s frame buffer device\n", info->fix.id);
 302         return 0;
 303
 304 err_fb_dealoc:
 305         fb_dealloc_cmap(&info->cmap);
 306 err_unmap:
 307         iounmap(info->screen_base);
 308 err_release_fb:
 309         framebuffer_release(info);
 310 err_release_mem:
 311         if (request_mem_succeeded)
 312                 release_mem_region(efifb_fix.smem_start, size_total);
 313         return err;
 314 }
 315
 316 static int efifb_remove(struct platform_device *pdev)
 317 {
 318         struct fb_info *info = platform_get_drvdata(pdev);
 319
 320         unregister_framebuffer(info);
 321         framebuffer_release(info);
 322
 323         return 0;
 324 }
 325
 326 static struct platform_driver efifb_driver = {
 327         .driver = {
 328                 .name = "efi-framebuffer",
 329         },
 330         .probe = efifb_probe,
 331         .remove = efifb_remove,
 332 };
 333
 334 module_platform_driver(efifb_driver);
 335 MODULE_LICENSE("GPL");