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*******************************************************************************/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>

#include "config_marvell.h"  	/* Required to identify SOC and Board */
#include "bin_hdr_twsi.h"
#include "mvUart.h"

#include "bootstrap_os.h"


/************************************************************************************
* Name:		suspendWakeup -
* Desc:	 	Detectes suspend to RAM state, reads the return PC
* 		and 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_WAKEUP_ADDR 		(0x3000)
#define SUSPEND_MAGIC_WORD 	(0xDEADB002)
#define REGISTER_LIST_END 	(0xFFFFFFFF)

MV_STATUS suspendWakeup(void)
{
	int *boot_info = (int*)(BOOT_INFO_WAKEUP_ADDR);
	int  magic_word;
	void (*resumeFunc)(void) = NULL;
	int *reg_addr, reg_value;

	magic_word =  *(boot_info);

	if(magic_word == SUSPEND_MAGIC_WORD)
	{
		/* Clear magic word to avoid succesive resumes */
		(*boot_info++) =  0x0;

		resumeFunc = (void *)(*boot_info++);

		DEBUG_INIT_S("Detected suspend to RAM. Returning to OS\n");

		/* Restore registers */
		reg_addr = (int *)(*boot_info++);

		while (reg_addr != (int *)REGISTER_LIST_END)
		{
			reg_value = (*boot_info++);
			*reg_addr = reg_value;

			reg_addr = (int *)(*boot_info++);
		}

		/* CLean after bootrom */

		/* Jump back to OS */
		resumeFunc();
	}

	return MV_OK;
}