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

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

#include <common.h>
#include <asm/io.h>
#if !defined(CONFIG_ARMV7_NONSEC) || !defined(CONFIG_ARMV7_VIRT)
#error " Deep sleep needs non-secure mode support. "
#else
#include <asm/secure.h>
#endif
#include <asm/armv7.h>
#include <asm/cache.h>

#if defined(CONFIG_LS102XA)
#include <asm/arch/immap_ls102xa.h>
#endif

#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_FSL_GUTS_ADDR;

	if (in_be32(&gur->crstsr) & 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)
{
	u64 *src, *dst;
	int i;
	struct ccsr_scfg __iomem *scfg = (void *)CONFIG_SYS_FSL_SCFG_ADDR;

	/* get the address of ddr date from SPARECR3 */
	src = (u64 *)in_le32(&scfg->sparecr[2]);
	dst = (u64 *)CONFIG_SYS_SDRAM_BASE;

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

	flush_dcache_all();
}

static void dp_resume_prepare(void)
{
	dp_ddr_restore();
	board_sleep_prepare();
	armv7_init_nonsec();
	cleanup_before_linux();
}

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

	if (!is_warm_boot())
		return 0;

	dp_resume_prepare();

	/* Get the entry address and jump to kernel */
	start_addr = in_le32(&scfg->sparecr[1]);
	debug("Entry address is 0x%08x\n", start_addr);
	kernel_resume = (void (*)(void))start_addr;
	secure_ram_addr(_do_nonsec_entry)(kernel_resume, 0, 0, 0);

	return 0;
}