xref: /openbmc/u-boot/common/lcd_simplefb.c (revision 63c011f7)
1 /*
2  * Simplefb device tree support
3  *
4  * (C) Copyright 2015
5  * Stephen Warren <swarren@wwwdotorg.org>
6  *
7  * SPDX-License-Identifier:	GPL-2.0+
8  */
9 
10 #include <common.h>
11 #include <dm.h>
12 #include <lcd.h>
13 #include <fdt_support.h>
14 #include <libfdt.h>
15 #include <video.h>
16 
17 DECLARE_GLOBAL_DATA_PTR;
18 
19 static int lcd_dt_simplefb_configure_node(void *blob, int off)
20 {
21 	int xsize, ysize;
22 	int bpix; /* log2 of bits per pixel */
23 	const char *name;
24 	ulong fb_base;
25 #ifdef CONFIG_DM_VIDEO
26 	struct video_uc_platdata *plat;
27 	struct video_priv *uc_priv;
28 	struct udevice *dev;
29 	int ret;
30 
31 	ret = uclass_first_device_err(UCLASS_VIDEO, &dev);
32 	if (ret)
33 		return ret;
34 	uc_priv = dev_get_uclass_priv(dev);
35 	plat = dev_get_uclass_platdata(dev);
36 	xsize = uc_priv->xsize;
37 	ysize = uc_priv->ysize;
38 	bpix = uc_priv->bpix;
39 	fb_base = plat->base;
40 #else
41 	xsize = lcd_get_pixel_width();
42 	ysize = lcd_get_pixel_height();
43 	bpix = LCD_BPP;
44 	fb_base = gd->fb_base;
45 #endif
46 	switch (bpix) {
47 	case 4: /* VIDEO_BPP16 */
48 		name = "r5g6b5";
49 		break;
50 	case 5: /* VIDEO_BPP32 */
51 		name = "a8r8g8b8";
52 		break;
53 	default:
54 		return -EINVAL;
55 	}
56 
57 	return fdt_setup_simplefb_node(blob, off, fb_base, xsize, ysize,
58 				       xsize * (1 << bpix) / 8, name);
59 }
60 
61 int lcd_dt_simplefb_add_node(void *blob)
62 {
63 	static const char compat[] = "simple-framebuffer";
64 	static const char disabled[] = "disabled";
65 	int off, ret;
66 
67 	off = fdt_add_subnode(blob, 0, "framebuffer");
68 	if (off < 0)
69 		return -1;
70 
71 	ret = fdt_setprop(blob, off, "status", disabled, sizeof(disabled));
72 	if (ret < 0)
73 		return -1;
74 
75 	ret = fdt_setprop(blob, off, "compatible", compat, sizeof(compat));
76 	if (ret < 0)
77 		return -1;
78 
79 	return lcd_dt_simplefb_configure_node(blob, off);
80 }
81 
82 int lcd_dt_simplefb_enable_existing_node(void *blob)
83 {
84 	int off;
85 
86 	off = fdt_node_offset_by_compatible(blob, -1, "simple-framebuffer");
87 	if (off < 0)
88 		return -1;
89 
90 	return lcd_dt_simplefb_configure_node(blob, off);
91 }
92