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/*
* Copyright 2013 Google Inc.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* on the rights to use, copy, modify, merge, publish, distribute, sub
* license, and/or sell copies of the Software, and to permit persons to whom
* the Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
* IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#include <console/console.h>
#include <edid.h>
#include <boot/coreboot_tables.h>
static int fb_valid;
static struct lb_framebuffer edid_fb;
/*
* Take an edid, and create a framebuffer. Set fb_valid to 1.
*/
void set_vbe_mode_info_valid(const struct edid *edid, uintptr_t fb_addr)
{
edid_fb.physical_address = fb_addr;
edid_fb.x_resolution = edid->x_resolution;
edid_fb.y_resolution = edid->y_resolution;
edid_fb.bytes_per_line = edid->bytes_per_line;
/* In the case of (e.g.) 24 framebuffer bits per pixel, the convention
* nowadays seems to be to round it up to the nearest reasonable
* boundary, because otherwise the byte-packing is hideous.
* So, for example, in RGB with no alpha, the bytes are still
* packed into 32-bit words, the so-called 32bpp-no-alpha mode.
* Or, in 5:6:5 mode, the bytes are also packed into 32-bit words,
* and in 4:4:4 mode, they are packed into 16-bit words.
* Good call on the hardware guys part.
* It's not clear we're covering all cases here, but
* I'm not sure with grahpics you ever can.
*/
edid_fb.bits_per_pixel = edid->framebuffer_bits_per_pixel;
edid_fb.reserved_mask_pos = 0;
edid_fb.reserved_mask_size = 0;
switch (edid->framebuffer_bits_per_pixel) {
case 32:
case 24:
/* packed into 4-byte words */
edid_fb.reserved_mask_pos = 24;
edid_fb.reserved_mask_size = 8;
edid_fb.red_mask_pos = 16;
edid_fb.red_mask_size = 8;
edid_fb.green_mask_pos = 8;
edid_fb.green_mask_size = 8;
edid_fb.blue_mask_pos = 0;
edid_fb.blue_mask_size = 8;
break;
case 16:
/* packed into 2-byte words */
edid_fb.red_mask_pos = 11;
edid_fb.red_mask_size = 5;
edid_fb.green_mask_pos = 5;
edid_fb.green_mask_size = 6;
edid_fb.blue_mask_pos = 0;
edid_fb.blue_mask_size = 5;
break;
default:
printk(BIOS_SPEW, "%s: unsupported BPP %d\n", __func__,
edid->framebuffer_bits_per_pixel);
return;
}
fb_valid = 1;
}
void set_vbe_framebuffer_orientation(enum lb_fb_orientation orientation)
{
edid_fb.orientation = orientation;
}
int fill_lb_framebuffer(struct lb_framebuffer *framebuffer)
{
if (!fb_valid)
return -1;
*framebuffer = edid_fb;
return 0;
}
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