u-boot/board/freescale/common/mpc85xx_sleep.c

/*
 * Copyright 2014 Freescale Semiconductor, Inc.
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */

#include <common.h>
#include <asm/immap_85xx.h>
#include "sleep.h"

DECLARE_GLOBAL_DATA_PTR;

void __weak board_mem_sleep_setup(void)
{
}

void __weak board_sleep_prepare(void)
{
}

bool is_warm_boot(void)
{
	struct ccsr_gur __iomem *gur = (void *)CONFIG_SYS_MPC85xx_GUTS_ADDR;

	if (in_be32(&gur->scrtsr[0]) & DCFG_CCSR_CRSTSR_WDRFR)
		return 1;

	return 0;
}

void fsl_dp_disable_console(void)
{
	gd->flags |= GD_FLG_SILENT | GD_FLG_DISABLE_CONSOLE;
}

/*
 * When wakeup from deep sleep, the first 128 bytes space
 * will be used to do DDR training which corrupts the data
 * in there. This function will restore them.
 */
static void dp_ddr_restore(void)
{
	volatile u64 *src, *dst;
	int i;
	struct ccsr_scfg __iomem *scfg = (void *)CONFIG_SYS_MPC85xx_SCFG;

	/* get the address of ddr date from SPARECR3 */
	src = (u64 *)in_be32(&scfg->sparecr[2]);
	dst = (u64 *)CONFIG_SYS_SDRAM_BASE;

	for (i = 0; i < DDR_BUFF_LEN / 8; i++)
		*dst++ = *src++;

	flush_dcache();
}

static void dp_resume_prepare(void)
{
	dp_ddr_restore();

	board_sleep_prepare();

	l2cache_init();
#if defined(CONFIG_RAMBOOT_PBL)
	disable_cpc_sram();
#endif
	enable_cpc();
}

int fsl_dp_resume(void)
{
	u32 start_addr;
	void (*kernel_resume)(void);
	struct ccsr_scfg __iomem *scfg = (void *)CONFIG_SYS_MPC85xx_SCFG;

	if (!is_warm_boot())
		return 0;

	dp_resume_prepare();

	/* Get the entry address and jump to kernel */
	start_addr = in_be32(&scfg->sparecr[1]);
	debug("Entry address is 0x%08x\n", start_addr);
	kernel_resume = (void (*)(void))start_addr;
	kernel_resume();

	return 0;
}