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[u-boot] / common / lcd_simplefb.c
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 }