1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Simplefb device tree support
4 *
5 * (C) Copyright 2015
6 * Stephen Warren <swarren@wwwdotorg.org>
7 */
8
9 #include <common.h>
10 #include <dm.h>
11 #include <lcd.h>
12 #include <fdt_support.h>
13 #include <asm/global_data.h>
14 #include <linux/libfdt.h>
15 #include <video.h>
16
17 DECLARE_GLOBAL_DATA_PTR;
18
lcd_dt_simplefb_configure_node(void * blob,int off)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_plat *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_plat(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
lcd_dt_simplefb_add_node(void * blob)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
lcd_dt_simplefb_enable_existing_node(void * blob)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