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/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 #define efifb_attr_decl(name, fmt)                                      \
 122 static ssize_t name##_show(struct device *dev,                          \
 123                            struct device_attribute *attr,               \
 124                            char *buf)                                   \
 125 {                                                                       \
 126         return sprintf(buf, fmt "\n", (screen_info.lfb_##name));        \
 127 }                                                                       \
 128 static DEVICE_ATTR_RO(name)
 129
 130 efifb_attr_decl(base, "0x%x");
 131 efifb_attr_decl(linelength, "%u");
 132 efifb_attr_decl(height, "%u");
 133 efifb_attr_decl(width, "%u");
 134 efifb_attr_decl(depth, "%u");
 135
 136 static struct attribute *efifb_attrs[] = {
 137         &dev_attr_base.attr,
 138         &dev_attr_linelength.attr,
 139         &dev_attr_width.attr,
 140         &dev_attr_height.attr,
 141         &dev_attr_depth.attr,
 142         NULL
 143 };
 144 ATTRIBUTE_GROUPS(efifb);
 145
 146 static int efifb_probe(struct platform_device *dev)
 147 {
 148         struct fb_info *info;
 149         int err;
 150         unsigned int size_vmode;
 151         unsigned int size_remap;
 152         unsigned int size_total;
 153         char *option = NULL;
 154
 155         if (screen_info.orig_video_isVGA != VIDEO_TYPE_EFI)
 156                 return -ENODEV;
 157
 158         if (fb_get_options("efifb", &option))
 159                 return -ENODEV;
 160         efifb_setup(option);
 161
 162         /* We don't get linelength from UGA Draw Protocol, only from
 163          * EFI Graphics Protocol.  So if it's not in DMI, and it's not
 164          * passed in from the user, we really can't use the framebuffer.
 165          */
 166         if (!screen_info.lfb_linelength)
 167                 return -ENODEV;
 168
 169         if (!screen_info.lfb_depth)
 170                 screen_info.lfb_depth = 32;
 171         if (!screen_info.pages)
 172                 screen_info.pages = 1;
 173         if (!fb_base_is_valid()) {
 174                 printk(KERN_DEBUG "efifb: invalid framebuffer address\n");
 175                 return -ENODEV;
 176         }
 177         printk(KERN_INFO "efifb: probing for efifb\n");
 178
 179         /* just assume they're all unset if any are */
 180         if (!screen_info.blue_size) {
 181                 screen_info.blue_size = 8;
 182                 screen_info.blue_pos = 0;
 183                 screen_info.green_size = 8;
 184                 screen_info.green_pos = 8;
 185                 screen_info.red_size = 8;
 186                 screen_info.red_pos = 16;
 187                 screen_info.rsvd_size = 8;
 188                 screen_info.rsvd_pos = 24;
 189         }
 190
 191         efifb_fix.smem_start = screen_info.lfb_base;
 192
 193         if (screen_info.capabilities & VIDEO_CAPABILITY_64BIT_BASE) {
 194                 u64 ext_lfb_base;
 195
 196                 ext_lfb_base = (u64)(unsigned long)screen_info.ext_lfb_base << 32;
 197                 efifb_fix.smem_start |= ext_lfb_base;
 198         }
 199
 200         efifb_defined.bits_per_pixel = screen_info.lfb_depth;
 201         efifb_defined.xres = screen_info.lfb_width;
 202         efifb_defined.yres = screen_info.lfb_height;
 203         efifb_fix.line_length = screen_info.lfb_linelength;
 204
 205         /*   size_vmode -- that is the amount of memory needed for the
 206          *                 used video mode, i.e. the minimum amount of
 207          *                 memory we need. */
 208         size_vmode = efifb_defined.yres * efifb_fix.line_length;
 209
 210         /*   size_total -- all video memory we have. Used for
 211          *                 entries, ressource allocation and bounds
 212          *                 checking. */
 213         size_total = screen_info.lfb_size;
 214         if (size_total < size_vmode)
 215                 size_total = size_vmode;
 216
 217         /*   size_remap -- the amount of video memory we are going to
 218          *                 use for efifb.  With modern cards it is no
 219          *                 option to simply use size_total as that
 220          *                 wastes plenty of kernel address space. */
 221         size_remap  = size_vmode * 2;
 222         if (size_remap > size_total)
 223                 size_remap = size_total;
 224         if (size_remap % PAGE_SIZE)
 225                 size_remap += PAGE_SIZE - (size_remap % PAGE_SIZE);
 226         efifb_fix.smem_len = size_remap;
 227
 228         if (request_mem_region(efifb_fix.smem_start, size_remap, "efifb")) {
 229                 request_mem_succeeded = true;
 230         } else {
 231                 /* We cannot make this fatal. Sometimes this comes from magic
 232                    spaces our resource handlers simply don't know about */
 233                 pr_warn("efifb: cannot reserve video memory at 0x%lx\n",
 234                         efifb_fix.smem_start);
 235         }
 236
 237         info = framebuffer_alloc(sizeof(u32) * 16, &dev->dev);
 238         if (!info) {
 239                 pr_err("efifb: cannot allocate framebuffer\n");
 240                 err = -ENOMEM;
 241                 goto err_release_mem;
 242         }
 243         platform_set_drvdata(dev, info);
 244         info->pseudo_palette = info->par;
 245         info->par = NULL;
 246
 247         info->apertures = alloc_apertures(1);
 248         if (!info->apertures) {
 249                 err = -ENOMEM;
 250                 goto err_release_fb;
 251         }
 252         info->apertures->ranges[0].base = efifb_fix.smem_start;
 253         info->apertures->ranges[0].size = size_remap;
 254
 255         info->screen_base = ioremap_wc(efifb_fix.smem_start, efifb_fix.smem_len);
 256         if (!info->screen_base) {
 257                 pr_err("efifb: abort, cannot ioremap video memory 0x%x @ 0x%lx\n",
 258                         efifb_fix.smem_len, efifb_fix.smem_start);
 259                 err = -EIO;
 260                 goto err_release_fb;
 261         }
 262
 263         pr_info("efifb: framebuffer at 0x%lx, using %dk, total %dk\n",
 264                efifb_fix.smem_start, size_remap/1024, size_total/1024);
 265         pr_info("efifb: mode is %dx%dx%d, linelength=%d, pages=%d\n",
 266                efifb_defined.xres, efifb_defined.yres,
 267                efifb_defined.bits_per_pixel, efifb_fix.line_length,
 268                screen_info.pages);
 269
 270         efifb_defined.xres_virtual = efifb_defined.xres;
 271         efifb_defined.yres_virtual = efifb_fix.smem_len /
 272                                         efifb_fix.line_length;
 273         pr_info("efifb: scrolling: redraw\n");
 274         efifb_defined.yres_virtual = efifb_defined.yres;
 275
 276         /* some dummy values for timing to make fbset happy */
 277         efifb_defined.pixclock     = 10000000 / efifb_defined.xres *
 278                                         1000 / efifb_defined.yres;
 279         efifb_defined.left_margin  = (efifb_defined.xres / 8) & 0xf8;
 280         efifb_defined.hsync_len    = (efifb_defined.xres / 8) & 0xf8;
 281
 282         efifb_defined.red.offset    = screen_info.red_pos;
 283         efifb_defined.red.length    = screen_info.red_size;
 284         efifb_defined.green.offset  = screen_info.green_pos;
 285         efifb_defined.green.length  = screen_info.green_size;
 286         efifb_defined.blue.offset   = screen_info.blue_pos;
 287         efifb_defined.blue.length   = screen_info.blue_size;
 288         efifb_defined.transp.offset = screen_info.rsvd_pos;
 289         efifb_defined.transp.length = screen_info.rsvd_size;
 290
 291         pr_info("efifb: %s: "
 292                "size=%d:%d:%d:%d, shift=%d:%d:%d:%d\n",
 293                "Truecolor",
 294                screen_info.rsvd_size,
 295                screen_info.red_size,
 296                screen_info.green_size,
 297                screen_info.blue_size,
 298                screen_info.rsvd_pos,
 299                screen_info.red_pos,
 300                screen_info.green_pos,
 301                screen_info.blue_pos);
 302
 303         efifb_fix.ypanstep  = 0;
 304         efifb_fix.ywrapstep = 0;
 305
 306         info->fbops = &efifb_ops;
 307         info->var = efifb_defined;
 308         info->fix = efifb_fix;
 309         info->flags = FBINFO_FLAG_DEFAULT | FBINFO_MISC_FIRMWARE;
 310
 311         err = sysfs_create_groups(&dev->dev.kobj, efifb_groups);
 312         if (err) {
 313                 pr_err("efifb: cannot add sysfs attrs\n");
 314                 goto err_unmap;
 315         }
 316         err = fb_alloc_cmap(&info->cmap, 256, 0);
 317         if (err < 0) {
 318                 pr_err("efifb: cannot allocate colormap\n");
 319                 goto err_groups;
 320         }
 321         err = register_framebuffer(info);
 322         if (err < 0) {
 323                 pr_err("efifb: cannot register framebuffer\n");
 324                 goto err_fb_dealoc;
 325         }
 326         fb_info(info, "%s frame buffer device\n", info->fix.id);
 327         return 0;
 328
 329 err_fb_dealoc:
 330         fb_dealloc_cmap(&info->cmap);
 331 err_groups:
 332         sysfs_remove_groups(&dev->dev.kobj, efifb_groups);
 333 err_unmap:
 334         iounmap(info->screen_base);
 335 err_release_fb:
 336         framebuffer_release(info);
 337 err_release_mem:
 338         if (request_mem_succeeded)
 339                 release_mem_region(efifb_fix.smem_start, size_total);
 340         return err;
 341 }
 342
 343 static int efifb_remove(struct platform_device *pdev)
 344 {
 345         struct fb_info *info = platform_get_drvdata(pdev);
 346
 347         unregister_framebuffer(info);
 348         sysfs_remove_groups(&pdev->dev.kobj, efifb_groups);
 349         framebuffer_release(info);
 350
 351         return 0;
 352 }
 353
 354 static struct platform_driver efifb_driver = {
 355         .driver = {
 356                 .name = "efi-framebuffer",
 357         },
 358         .probe = efifb_probe,
 359         .remove = efifb_remove,
 360 };
 361
 362 builtin_platform_driver(efifb_driver);