xref: /openbmc/u-boot/drivers/video/bcm2835.c (revision 29b103c7)
1 /*
2  * (C) Copyright 2012 Stephen Warren
3  *
4  * SPDX-License-Identifier:	GPL-2.0+
5  */
6 
7 #include <common.h>
8 #include <lcd.h>
9 #include <asm/arch/mbox.h>
10 #include <asm/global_data.h>
11 
12 DECLARE_GLOBAL_DATA_PTR;
13 
14 /* Global variables that lcd.c expects to exist */
15 vidinfo_t panel_info;
16 
17 static u32 bcm2835_pitch;
18 
19 struct msg_query {
20 	struct bcm2835_mbox_hdr hdr;
21 	struct bcm2835_mbox_tag_physical_w_h physical_w_h;
22 	u32 end_tag;
23 };
24 
25 struct msg_setup {
26 	struct bcm2835_mbox_hdr hdr;
27 	struct bcm2835_mbox_tag_physical_w_h physical_w_h;
28 	struct bcm2835_mbox_tag_virtual_w_h virtual_w_h;
29 	struct bcm2835_mbox_tag_depth depth;
30 	struct bcm2835_mbox_tag_pixel_order pixel_order;
31 	struct bcm2835_mbox_tag_alpha_mode alpha_mode;
32 	struct bcm2835_mbox_tag_virtual_offset virtual_offset;
33 	struct bcm2835_mbox_tag_overscan overscan;
34 	struct bcm2835_mbox_tag_allocate_buffer allocate_buffer;
35 	struct bcm2835_mbox_tag_pitch pitch;
36 	u32 end_tag;
37 };
38 
39 void lcd_ctrl_init(void *lcdbase)
40 {
41 	ALLOC_ALIGN_BUFFER(struct msg_query, msg_query, 1, 16);
42 	ALLOC_ALIGN_BUFFER(struct msg_setup, msg_setup, 1, 16);
43 	int ret;
44 	u32 w, h;
45 
46 	debug("bcm2835: Query resolution...\n");
47 
48 	BCM2835_MBOX_INIT_HDR(msg_query);
49 	BCM2835_MBOX_INIT_TAG_NO_REQ(&msg_query->physical_w_h,
50 					GET_PHYSICAL_W_H);
51 	ret = bcm2835_mbox_call_prop(BCM2835_MBOX_PROP_CHAN, &msg_query->hdr);
52 	if (ret) {
53 		printf("bcm2835: Could not query display resolution\n");
54 		/* FIXME: How to disable the LCD to prevent errors? hang()? */
55 		return;
56 	}
57 
58 	w = msg_query->physical_w_h.body.resp.width;
59 	h = msg_query->physical_w_h.body.resp.height;
60 
61 	debug("bcm2835: Setting up display for %d x %d\n", w, h);
62 
63 	BCM2835_MBOX_INIT_HDR(msg_setup);
64 	BCM2835_MBOX_INIT_TAG(&msg_setup->physical_w_h, SET_PHYSICAL_W_H);
65 	msg_setup->physical_w_h.body.req.width = w;
66 	msg_setup->physical_w_h.body.req.height = h;
67 	BCM2835_MBOX_INIT_TAG(&msg_setup->virtual_w_h, SET_VIRTUAL_W_H);
68 	msg_setup->virtual_w_h.body.req.width = w;
69 	msg_setup->virtual_w_h.body.req.height = h;
70 	BCM2835_MBOX_INIT_TAG(&msg_setup->depth, SET_DEPTH);
71 	msg_setup->depth.body.req.bpp = 16;
72 	BCM2835_MBOX_INIT_TAG(&msg_setup->pixel_order, SET_PIXEL_ORDER);
73 	msg_setup->pixel_order.body.req.order = BCM2835_MBOX_PIXEL_ORDER_BGR;
74 	BCM2835_MBOX_INIT_TAG(&msg_setup->alpha_mode, SET_ALPHA_MODE);
75 	msg_setup->alpha_mode.body.req.alpha = BCM2835_MBOX_ALPHA_MODE_IGNORED;
76 	BCM2835_MBOX_INIT_TAG(&msg_setup->virtual_offset, SET_VIRTUAL_OFFSET);
77 	msg_setup->virtual_offset.body.req.x = 0;
78 	msg_setup->virtual_offset.body.req.y = 0;
79 	BCM2835_MBOX_INIT_TAG(&msg_setup->overscan, SET_OVERSCAN);
80 	msg_setup->overscan.body.req.top = 0;
81 	msg_setup->overscan.body.req.bottom = 0;
82 	msg_setup->overscan.body.req.left = 0;
83 	msg_setup->overscan.body.req.right = 0;
84 	BCM2835_MBOX_INIT_TAG(&msg_setup->allocate_buffer, ALLOCATE_BUFFER);
85 	msg_setup->allocate_buffer.body.req.alignment = 0x100;
86 	BCM2835_MBOX_INIT_TAG_NO_REQ(&msg_setup->pitch, GET_PITCH);
87 
88 	ret = bcm2835_mbox_call_prop(BCM2835_MBOX_PROP_CHAN, &msg_setup->hdr);
89 	if (ret) {
90 		printf("bcm2835: Could not configure display\n");
91 		/* FIXME: How to disable the LCD to prevent errors? hang()? */
92 		return;
93 	}
94 
95 	w = msg_setup->physical_w_h.body.resp.width;
96 	h = msg_setup->physical_w_h.body.resp.height;
97 	bcm2835_pitch = msg_setup->pitch.body.resp.pitch;
98 
99 	debug("bcm2835: Final resolution is %d x %d\n", w, h);
100 
101 	panel_info.vl_col = w;
102 	panel_info.vl_row = h;
103 	panel_info.vl_bpix = LCD_COLOR16;
104 
105 	gd->fb_base = msg_setup->allocate_buffer.body.resp.fb_address;
106 }
107 
108 void lcd_enable(void)
109 {
110 }
111 
112 int lcd_get_size(int *line_length)
113 {
114 	*line_length = bcm2835_pitch;
115 	return *line_length * panel_info.vl_row;
116 }
117