src/lib/edid_fill_fb.c

   1 /* SPDX-License-Identifier: MIT */
   2
   3 #include <console/console.h>
   4 #include <edid.h>
   5 #include <boot/coreboot_tables.h>
   6 #include <framebuffer_info.h>
   7 #include <string.h>
   8 #include <stdlib.h>
   9 #include <commonlib/list.h>
  10
  11 struct fb_info {
  12         struct list_node node;
  13         struct lb_framebuffer fb;
  14 };
  15 static struct list_node list;
  16
  17 /*
  18  * Allocate a new framebuffer info struct on heap.
  19  * Returns NULL on error.
  20  */
  21 static struct fb_info *fb_new_framebuffer_info(void)
  22 {
  23         struct fb_info *ret;
  24         ret = malloc(sizeof(struct fb_info));
  25         if (ret)
  26                 memset(ret, 0, sizeof(struct fb_info));
  27
  28         return ret;
  29 }
  30
  31 /*
  32  * Fills a provided framebuffer info struct and adds it to the internal list if it's
  33  * valid. Returns NULL on error.
  34  */
  35 struct fb_info *
  36 fb_add_framebuffer_info_ex(const struct lb_framebuffer *fb)
  37 {
  38         struct fb_info *info;
  39         uint8_t bpp_mask;
  40
  41         /* Validate input */
  42         if (!fb || !fb->x_resolution || !fb->y_resolution || !fb->bytes_per_line ||
  43             !fb->bits_per_pixel) {
  44                 printk(BIOS_ERR, "%s: Invalid framebuffer data provided\n", __func__);
  45                 return NULL;
  46         }
  47
  48         bpp_mask = fb->blue_mask_size + fb->green_mask_size + fb->red_mask_size +
  49                 fb->reserved_mask_size;
  50         if (bpp_mask > fb->bits_per_pixel) {
  51                 printk(BIOS_ERR,
  52                        "%s: channel bit mask=%d is greater than BPP=%d ."
  53                        " This is a driver bug. Framebuffer is invalid.\n",
  54                        __func__, bpp_mask, fb->bits_per_pixel);
  55                 return NULL;
  56         } else if (bpp_mask != fb->bits_per_pixel) {
  57                 printk(BIOS_WARNING,
  58                        "%s: channel bit mask=%d and BPP=%d don't match."
  59                        " This is a driver bug.\n",
  60                        __func__, bpp_mask, fb->bits_per_pixel);
  61         }
  62
  63         info = fb_new_framebuffer_info();
  64         if (!info)
  65                 return NULL;
  66
  67         printk(BIOS_INFO, "framebuffer_info: bytes_per_line: %d, bits_per_pixel: %d\n "
  68                           "                  x_res x y_res: %d x %d, size: %d at 0x%llx\n",
  69                         fb->bytes_per_line, fb->bits_per_pixel, fb->x_resolution,
  70                         fb->y_resolution, (fb->bytes_per_line * fb->y_resolution),
  71                         fb->physical_address);
  72
  73         /* Update */
  74         info->fb = *fb;
  75
  76         list_insert_after(&info->node, &list);
  77
  78         return info;
  79 }
  80
  81 /*
  82  * Allocates a new framebuffer info struct and fills it for 32/24/16bpp framebuffers.
  83  * Intended for drivers that only support reporting the current information or have a single
  84  * modeset invocation.
  85  *
  86  * Complex drivers should use fb_add_framebuffer_info_ex() instead.
  87  */
  88 struct fb_info *
  89 fb_add_framebuffer_info(uintptr_t fb_addr, uint32_t x_resolution,
  90                         uint32_t y_resolution, uint32_t bytes_per_line,
  91                         uint8_t bits_per_pixel)
  92 {
  93         struct fb_info *info = NULL;
  94
  95         switch (bits_per_pixel) {
  96         case 32:
  97         case 24: {
  98                 /* FIXME: 24 BPP might be RGB8 or XRGB8 */
  99                 /* packed into 4-byte words */
 100
 101                 const struct lb_framebuffer fb = {
 102                         .physical_address    = fb_addr,
 103                         .x_resolution        = x_resolution,
 104                         .y_resolution        = y_resolution,
 105                         .bytes_per_line      = bytes_per_line,
 106                         .bits_per_pixel      = bits_per_pixel,
 107                         .red_mask_pos        = 16,
 108                         .red_mask_size       = 8,
 109                         .green_mask_pos      = 8,
 110                         .green_mask_size     = 8,
 111                         .blue_mask_pos       = 0,
 112                         .blue_mask_size      = 8,
 113                         .reserved_mask_pos   = 24,
 114                         .reserved_mask_size  = 8,
 115                         .orientation         = LB_FB_ORIENTATION_NORMAL,
 116                 };
 117
 118                 info = fb_add_framebuffer_info_ex(&fb);
 119                 break;
 120         }
 121         case 16: {
 122                 /* packed into 2-byte words */
 123                 const struct lb_framebuffer fb = {
 124                         .physical_address   = fb_addr,
 125                         .x_resolution       = x_resolution,
 126                         .y_resolution       = y_resolution,
 127                         .bytes_per_line     = bytes_per_line,
 128                         .bits_per_pixel     = 16,
 129                         .red_mask_pos       = 11,
 130                         .red_mask_size      = 5,
 131                         .green_mask_pos     = 5,
 132                         .green_mask_size    = 6,
 133                         .blue_mask_pos      = 0,
 134                         .blue_mask_size     = 5,
 135                         .reserved_mask_pos  = 0,
 136                         .reserved_mask_size = 0,
 137                         .orientation        = LB_FB_ORIENTATION_NORMAL,
 138                 };
 139                 info = fb_add_framebuffer_info_ex(&fb);
 140                 break;
 141         }
 142         default:
 143                 printk(BIOS_ERR, "%s: unsupported BPP %d\n", __func__, bits_per_pixel);
 144         }
 145         if (!info)
 146                 printk(BIOS_ERR, "%s: failed to add framebuffer info\n", __func__);
 147
 148         return info;
 149 }
 150
 151 /* Wrapper for Ada to have a simpler function signature */
 152 int fb_add_framebuffer_info_simple(uintptr_t fb_addr, uint32_t x_res, uint32_t y_res,
 153                                    uint32_t bytes_per_line, uint8_t bits_per_pixel)
 154 {
 155         return fb_add_framebuffer_info(fb_addr, x_res, y_res, bytes_per_line, bits_per_pixel) != NULL;
 156 }
 157
 158 void fb_set_orientation(struct fb_info *info, enum lb_fb_orientation orientation)
 159 {
 160         if (!info)
 161                 return;
 162
 163         info->fb.orientation = orientation;
 164 }
 165
 166 /*
 167  * Take an edid, and create a framebuffer.
 168  */
 169 struct fb_info *fb_new_framebuffer_info_from_edid(const struct edid *edid,
 170                                                          uintptr_t fb_addr)
 171 {
 172         return fb_add_framebuffer_info(fb_addr, edid->x_resolution, edid->y_resolution,
 173                 edid->bytes_per_line, edid->framebuffer_bits_per_pixel);
 174 }
 175
 176 int fill_lb_framebuffer(struct lb_framebuffer *framebuffer)
 177 {
 178         struct fb_info *i;
 179
 180         list_for_each(i, list, node) {
 181                 //TODO: Add support for advertising all framebuffers in this list
 182                 *framebuffer = i->fb;
 183                 return 0;
 184         }
 185         return -1;
 186 }