u-boot/drivers/video/bcm2835.c

/*
 * (C) Copyright 2012 Stephen Warren
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */

#include <common.h>
#include <lcd.h>
#include <memalign.h>
#include <phys2bus.h>
#include <asm/arch/mbox.h>
#include <asm/global_data.h>

DECLARE_GLOBAL_DATA_PTR;

/* Global variables that lcd.c expects to exist */
vidinfo_t panel_info;

static u32 bcm2835_pitch;

struct msg_query {
	struct bcm2835_mbox_hdr hdr;
	struct bcm2835_mbox_tag_physical_w_h physical_w_h;
	u32 end_tag;
};

struct msg_setup {
	struct bcm2835_mbox_hdr hdr;
	struct bcm2835_mbox_tag_physical_w_h physical_w_h;
	struct bcm2835_mbox_tag_virtual_w_h virtual_w_h;
	struct bcm2835_mbox_tag_depth depth;
	struct bcm2835_mbox_tag_pixel_order pixel_order;
	struct bcm2835_mbox_tag_alpha_mode alpha_mode;
	struct bcm2835_mbox_tag_virtual_offset virtual_offset;
	struct bcm2835_mbox_tag_overscan overscan;
	struct bcm2835_mbox_tag_allocate_buffer allocate_buffer;
	struct bcm2835_mbox_tag_pitch pitch;
	u32 end_tag;
};

void lcd_ctrl_init(void *lcdbase)
{
	ALLOC_CACHE_ALIGN_BUFFER(struct msg_query, msg_query, 1);
	ALLOC_CACHE_ALIGN_BUFFER(struct msg_setup, msg_setup, 1);
	int ret;
	u32 w, h;
	u32 fb_start, fb_end;

	debug("bcm2835: Query resolution...\n");

	BCM2835_MBOX_INIT_HDR(msg_query);
	BCM2835_MBOX_INIT_TAG_NO_REQ(&msg_query->physical_w_h,
					GET_PHYSICAL_W_H);
	ret = bcm2835_mbox_call_prop(BCM2835_MBOX_PROP_CHAN, &msg_query->hdr);
	if (ret) {
		printf("bcm2835: Could not query display resolution\n");
		/* FIXME: How to disable the LCD to prevent errors? hang()? */
		return;
	}

	w = msg_query->physical_w_h.body.resp.width;
	h = msg_query->physical_w_h.body.resp.height;

	debug("bcm2835: Setting up display for %d x %d\n", w, h);

	BCM2835_MBOX_INIT_HDR(msg_setup);
	BCM2835_MBOX_INIT_TAG(&msg_setup->physical_w_h, SET_PHYSICAL_W_H);
	msg_setup->physical_w_h.body.req.width = w;
	msg_setup->physical_w_h.body.req.height = h;
	BCM2835_MBOX_INIT_TAG(&msg_setup->virtual_w_h, SET_VIRTUAL_W_H);
	msg_setup->virtual_w_h.body.req.width = w;
	msg_setup->virtual_w_h.body.req.height = h;
	BCM2835_MBOX_INIT_TAG(&msg_setup->depth, SET_DEPTH);
	msg_setup->depth.body.req.bpp = 16;
	BCM2835_MBOX_INIT_TAG(&msg_setup->pixel_order, SET_PIXEL_ORDER);
	msg_setup->pixel_order.body.req.order = BCM2835_MBOX_PIXEL_ORDER_BGR;
	BCM2835_MBOX_INIT_TAG(&msg_setup->alpha_mode, SET_ALPHA_MODE);
	msg_setup->alpha_mode.body.req.alpha = BCM2835_MBOX_ALPHA_MODE_IGNORED;
	BCM2835_MBOX_INIT_TAG(&msg_setup->virtual_offset, SET_VIRTUAL_OFFSET);
	msg_setup->virtual_offset.body.req.x = 0;
	msg_setup->virtual_offset.body.req.y = 0;
	BCM2835_MBOX_INIT_TAG(&msg_setup->overscan, SET_OVERSCAN);
	msg_setup->overscan.body.req.top = 0;
	msg_setup->overscan.body.req.bottom = 0;
	msg_setup->overscan.body.req.left = 0;
	msg_setup->overscan.body.req.right = 0;
	BCM2835_MBOX_INIT_TAG(&msg_setup->allocate_buffer, ALLOCATE_BUFFER);
	msg_setup->allocate_buffer.body.req.alignment = 0x100;
	BCM2835_MBOX_INIT_TAG_NO_REQ(&msg_setup->pitch, GET_PITCH);

	ret = bcm2835_mbox_call_prop(BCM2835_MBOX_PROP_CHAN, &msg_setup->hdr);
	if (ret) {
		printf("bcm2835: Could not configure display\n");
		/* FIXME: How to disable the LCD to prevent errors? hang()? */
		return;
	}

	w = msg_setup->physical_w_h.body.resp.width;
	h = msg_setup->physical_w_h.body.resp.height;
	bcm2835_pitch = msg_setup->pitch.body.resp.pitch;

	debug("bcm2835: Final resolution is %d x %d\n", w, h);

	panel_info.vl_col = w;
	panel_info.vl_row = h;
	panel_info.vl_bpix = LCD_COLOR16;

	gd->fb_base = bus_to_phys(
		msg_setup->allocate_buffer.body.resp.fb_address);

	/* Enable dcache for the frame buffer */
	fb_start = gd->fb_base & ~(MMU_SECTION_SIZE - 1);
	fb_end = gd->fb_base + msg_setup->allocate_buffer.body.resp.fb_size;
	fb_end = ALIGN(fb_end, 1 << MMU_SECTION_SHIFT);
	mmu_set_region_dcache_behaviour(fb_start, fb_end - fb_start,
		DCACHE_WRITEBACK);
	lcd_set_flush_dcache(1);
}

void lcd_enable(void)
{
}

int lcd_get_size(int *line_length)
{
	*line_length = bcm2835_pitch;
	return *line_length * panel_info.vl_row;
}