lib/edid: Split out fill_lb_framebuffer()

Place it into new edid_fill_fb.c, and invert the logic of the Kconfig
guard (NATIVE_VGA_INIT_USE_EDID is now !NO_EDID_FILL_FB). It has to be
selected by all drivers that use MAINBOARD_DO_NATIVE_VGA_INIT but pro-
vide their own fill_lb_framebuffer() implementation.

Change-Id: I90634b835bd8e2d150b1c714328a5b2774d891bd
Signed-off-by: Nico Huber <nico.huber@secunet.com>
Reviewed-on: https://review.coreboot.org/19764
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-by: Julius Werner <jwerner@chromium.org>

1 files changed, 92 insertions, 0 deletions

diff --git a/src/lib/edid_fill_fb.c b/src/lib/edid_fill_fb.c
new file mode 100644
index 0000000000..210c727224
--- /dev/null
+++ b/src/lib/edid_fill_fb.c
@@ -0,0 +1,92 @@
+/*
+ * 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;
+}
+
+int fill_lb_framebuffer(struct lb_framebuffer *framebuffer)
+{
+	if (!fb_valid)
+		return -1;
+
+	*framebuffer = edid_fb;
+
+	return 0;
+}