u-boot/post/board/lwmon5/dsp.c

/*
 * (C) Copyright 2008 Dmitry Rakhchev, EmCraft Systems, rda@emcraft.com
 *
 * Developed for DENX Software Engineering GmbH
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */

#include <common.h>

#include <post.h>

#if CONFIG_POST & CONFIG_SYS_POST_DSP
#include <asm/io.h>

/* This test verifies DSP status bits in FPGA */

DECLARE_GLOBAL_DATA_PTR;

#define DSP_STATUS_REG		0xC4000008
#define FPGA_STATUS_REG		0xC400000C

int dsp_post_test(int flags)
{
	uint   old_value;
	uint   read_value;
	int    ret;

	/* momorize fpga status */
	old_value = in_be32((void *)FPGA_STATUS_REG);
	/* enable outputs */
	out_be32((void *)FPGA_STATUS_REG, 0x30);

	/* generate sync signal */
	out_be32((void *)DSP_STATUS_REG, 0x300);
	udelay(5);
	out_be32((void *)DSP_STATUS_REG, 0);
	udelay(500);

	/* read status */
	ret = 0;
	read_value = in_be32((void *)DSP_STATUS_REG) & 0x3;
	if (read_value != 0x03) {
		post_log("\nDSP status read %08X\n", read_value);
		ret = 1;
	}

	/* restore fpga status */
	out_be32((void *)FPGA_STATUS_REG, old_value);

	return ret;
}

#endif /* CONFIG_POST & CONFIG_SYS_POST_DSP */