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*******************************************************************************/
#include "config_marvell.h"  	/* Required to identify SOC and Board */
#include "mv_os.h"
#include "soc_spec.h"
#include "mvUart.h"
#include "mvSysEnvLib.h"

/************************************************************************************
* Name:		suspendWakeup:
* Desc:		- Detects suspend to RAM state
* 		- reads the return PC
* 		- performs registers write according to a list.
*
* 		The data is stored in the following format
* 		boot_info_addr + 0x0 = magic word
* 		boot_info_addr + 0x4 = resume pc
* 		boot_info_addr + 0x8 + 8*n = register addres (0xFFFFFFFF means end list)
*		boot_info_addr + 0xC + 8*n = register value
* Args:	 	None.
* Notes:
* Returns:	None.
*/
#define BOOT_INFO_ADDR				(0x3000)
#define SUSPEND_MAGIC_WORD			(0xDEADB002)
#define REGISTER_LIST_END			(0xFFFFFFFF)
MV_STATUS suspendWakeup(void)
{
	int *boot_info = (int*)(BOOT_INFO_ADDR);
	int  magic_word;
	void (*resumeFunc)(void) = NULL;
	int *reg_addr, reg_value;

	/* Check Suspend Wakeup support and Wakeup indication: (0 = not supported at all) */
	if (mvSysEnvSuspendWakeupCheck() == MV_SUSPEND_WAKEUP_DISABLED)
		return MV_OK;

	/* Read and clear magic word to avoid successive resumes */
	magic_word =  *(boot_info);
	(*boot_info++) =  0x0; /* boot_info -> return pc */

	if(!(magic_word == SUSPEND_MAGIC_WORD)) {
		DEBUG_INIT_S("Not detected suspend to RAM indication\n");
		return MV_OK;
	}
	DEBUG_INIT_S("Detected suspend to RAM indication\n");

	resumeFunc = (void *)(*boot_info++);
	/* boot_info now points to the 1st register address*/
	reg_addr = (int *)(*boot_info++);

	/* Restore registers */
	while (reg_addr != (int *)REGISTER_LIST_END) {
		reg_value = (*boot_info++);
		*reg_addr = reg_value;
		reg_addr = (int *)(*boot_info++);
	}

	/* Jump back to OS */
	DEBUG_INIT_S("Returning to OS\n");
	resumeFunc();

	return MV_OK;
}