rlm@1: #include <cstdio>
rlm@1: #include <cstring>
rlm@1: 
rlm@1: #include "Flash.h"
rlm@1: #include "GBA.h"
rlm@1: #include "GBAGlobals.h"
rlm@1: #include "Sram.h"
rlm@1: #include "../common/System.h"
rlm@1: #include "../common/Util.h"
rlm@1: 
rlm@1: #define FLASH_READ_ARRAY         0
rlm@1: #define FLASH_CMD_1              1
rlm@1: #define FLASH_CMD_2              2
rlm@1: #define FLASH_AUTOSELECT         3
rlm@1: #define FLASH_CMD_3              4
rlm@1: #define FLASH_CMD_4              5
rlm@1: #define FLASH_CMD_5              6
rlm@1: #define FLASH_ERASE_COMPLETE     7
rlm@1: #define FLASH_PROGRAM            8
rlm@1: #define FLASH_SETBANK            9
rlm@1: 
rlm@1: u8    flashSaveMemory[0x20000 + 4];
rlm@1: int32 flashState          = FLASH_READ_ARRAY;
rlm@1: int32 flashReadState      = FLASH_READ_ARRAY;
rlm@1: int32 flashSize           = 0x10000;
rlm@1: int32 flashDeviceID       = 0x1b;
rlm@1: int32 flashManufacturerID = 0x32;
rlm@1: int32 flashBank           = 0;
rlm@1: 
rlm@1: static variable_desc flashSaveData[] = {
rlm@1: 	{ &flashState,         sizeof(int32) },
rlm@1: 	{ &flashReadState,     sizeof(int32) },
rlm@1: 	{ &flashSaveMemory[0],       0x10000 },
rlm@1: 	{ NULL,                            0 }
rlm@1: };
rlm@1: 
rlm@1: static variable_desc flashSaveData2[] = {
rlm@1: 	{ &flashState,         sizeof(int32) },
rlm@1: 	{ &flashReadState,     sizeof(int32) },
rlm@1: 	{ &flashSize,          sizeof(int32) },
rlm@1: 	{ &flashSaveMemory[0],       0x20000 },
rlm@1: 	{ NULL,                            0 }
rlm@1: };
rlm@1: 
rlm@1: static variable_desc flashSaveData3[] = {
rlm@1: 	{ &flashState,         sizeof(int32) },
rlm@1: 	{ &flashReadState,     sizeof(int32) },
rlm@1: 	{ &flashSize,          sizeof(int32) },
rlm@1: 	{ &flashBank,          sizeof(int32) },
rlm@1: 	{ &flashSaveMemory[0],       0x20000 },
rlm@1: 	{ NULL,                            0 }
rlm@1: };
rlm@1: 
rlm@1: void flashReset()
rlm@1: {
rlm@1: 	flashState     = FLASH_READ_ARRAY;
rlm@1: 	flashReadState = FLASH_READ_ARRAY;
rlm@1: 	flashBank      = 0;
rlm@1: }
rlm@1: 
rlm@1: void flashErase()
rlm@1: {
rlm@1: 	memset(flashSaveMemory, 0, 0x20000*sizeof(u8));
rlm@1: 	flashState          = FLASH_READ_ARRAY;
rlm@1: 	flashReadState      = FLASH_READ_ARRAY;
rlm@1: 	flashSize           = 0x10000;
rlm@1: 	flashDeviceID       = 0x1b;
rlm@1: 	flashManufacturerID = 0x32;
rlm@1: 	flashBank           = 0;
rlm@1: }
rlm@1: 
rlm@1: void flashSaveGame(gzFile gzFile)
rlm@1: {
rlm@1: 	utilWriteData(gzFile, flashSaveData3);
rlm@1: }
rlm@1: 
rlm@1: void flashReadGame(gzFile gzFile, int version)
rlm@1: {
rlm@1: 	if (version < SAVE_GAME_VERSION_5)
rlm@1: 		utilReadData(gzFile, flashSaveData);
rlm@1: 	else if (version < SAVE_GAME_VERSION_7)
rlm@1: 	{
rlm@1: 		utilReadData(gzFile, flashSaveData2);
rlm@1: 		flashBank = 0;
rlm@1: 		flashSetSize(flashSize);
rlm@1: 	}
rlm@1: 	else
rlm@1: 	{
rlm@1: 		utilReadData(gzFile, flashSaveData3);
rlm@1: 	}
rlm@1: }
rlm@1: 
rlm@1: void flashSetSize(int size)
rlm@1: {
rlm@1: 	//  log("Setting flash size to %d\n", size);
rlm@1: 	flashSize = size;
rlm@1: 	if (size == 0x10000)
rlm@1: 	{
rlm@1: 		flashDeviceID       = 0x1b;
rlm@1: 		flashManufacturerID = 0x32;
rlm@1: 	}
rlm@1: 	else
rlm@1: 	{
rlm@1: 		flashDeviceID       = 0x13; //0x09;
rlm@1: 		flashManufacturerID = 0x62; //0xc2;
rlm@1: 	}
rlm@1: }
rlm@1: 
rlm@1: u8 flashRead(u32 address)
rlm@1: {
rlm@1: 	//  log("Reading %08x from %08x\n", address, reg[15].I);
rlm@1: 	//  log("Current read state is %d\n", flashReadState);
rlm@1: 	address &= 0xFFFF;
rlm@1: 
rlm@1: 	switch (flashReadState)
rlm@1: 	{
rlm@1: 	case FLASH_READ_ARRAY:
rlm@1: 		return flashSaveMemory[(flashBank << 16) + address];
rlm@1: 	case FLASH_AUTOSELECT:
rlm@1: 		switch (address & 0xFF)
rlm@1: 		{
rlm@1: 		case 0:
rlm@1: 			// manufacturer ID
rlm@1: 			return u8(flashManufacturerID);
rlm@1: 		case 1:
rlm@1: 			// device ID
rlm@1: 			return u8(flashDeviceID);
rlm@1: 		}
rlm@1: 		break;
rlm@1: 	case FLASH_ERASE_COMPLETE:
rlm@1: 		flashState     = FLASH_READ_ARRAY;
rlm@1: 		flashReadState = FLASH_READ_ARRAY;
rlm@1: 		return 0xFF;
rlm@1: 	}
rlm@1: 	;
rlm@1: 	return 0;
rlm@1: }
rlm@1: 
rlm@1: void flashSaveDecide(u32 address, u8 byte)
rlm@1: {
rlm@1: 	//  log("Deciding save type %08x\n", address);
rlm@1: 	if (address == 0x0e005555)
rlm@1: 	{
rlm@1: 		saveType        = 2;
rlm@1: 		cpuSaveGameFunc = flashWrite;
rlm@1: 	}
rlm@1: 	else
rlm@1: 	{
rlm@1: 		saveType        = 1;
rlm@1: 		cpuSaveGameFunc = sramWrite;
rlm@1: 	}
rlm@1: 
rlm@1: 	(*cpuSaveGameFunc)(address, byte);
rlm@1: }
rlm@1: 
rlm@1: void flashWrite(u32 address, u8 byte)
rlm@1: {
rlm@1: 	//  log("Writing %02x at %08x\n", byte, address);
rlm@1: 	//  log("Current state is %d\n", flashState);
rlm@1: 	address &= 0xFFFF;
rlm@1: 	switch (flashState)
rlm@1: 	{
rlm@1: 	case FLASH_READ_ARRAY:
rlm@1: 		if (address == 0x5555 && byte == 0xAA)
rlm@1: 			flashState = FLASH_CMD_1;
rlm@1: 		break;
rlm@1: 	case FLASH_CMD_1:
rlm@1: 		if (address == 0x2AAA && byte == 0x55)
rlm@1: 			flashState = FLASH_CMD_2;
rlm@1: 		else
rlm@1: 			flashState = FLASH_READ_ARRAY;
rlm@1: 		break;
rlm@1: 	case FLASH_CMD_2:
rlm@1: 		if (address == 0x5555)
rlm@1: 		{
rlm@1: 			if (byte == 0x90)
rlm@1: 			{
rlm@1: 				flashState     = FLASH_AUTOSELECT;
rlm@1: 				flashReadState = FLASH_AUTOSELECT;
rlm@1: 			}
rlm@1: 			else if (byte == 0x80)
rlm@1: 			{
rlm@1: 				flashState = FLASH_CMD_3;
rlm@1: 			}
rlm@1: 			else if (byte == 0xF0)
rlm@1: 			{
rlm@1: 				flashState     = FLASH_READ_ARRAY;
rlm@1: 				flashReadState = FLASH_READ_ARRAY;
rlm@1: 			}
rlm@1: 			else if (byte == 0xA0)
rlm@1: 			{
rlm@1: 				flashState = FLASH_PROGRAM;
rlm@1: 			}
rlm@1: 			else if (byte == 0xB0 && flashSize == 0x20000)
rlm@1: 			{
rlm@1: 				flashState = FLASH_SETBANK;
rlm@1: 			}
rlm@1: 			else
rlm@1: 			{
rlm@1: 				flashState     = FLASH_READ_ARRAY;
rlm@1: 				flashReadState = FLASH_READ_ARRAY;
rlm@1: 			}
rlm@1: 		}
rlm@1: 		else
rlm@1: 		{
rlm@1: 			flashState     = FLASH_READ_ARRAY;
rlm@1: 			flashReadState = FLASH_READ_ARRAY;
rlm@1: 		}
rlm@1: 		break;
rlm@1: 	case FLASH_CMD_3:
rlm@1: 		if (address == 0x5555 && byte == 0xAA)
rlm@1: 		{
rlm@1: 			flashState = FLASH_CMD_4;
rlm@1: 		}
rlm@1: 		else
rlm@1: 		{
rlm@1: 			flashState     = FLASH_READ_ARRAY;
rlm@1: 			flashReadState = FLASH_READ_ARRAY;
rlm@1: 		}
rlm@1: 		break;
rlm@1: 	case FLASH_CMD_4:
rlm@1: 		if (address == 0x2AAA && byte == 0x55)
rlm@1: 		{
rlm@1: 			flashState = FLASH_CMD_5;
rlm@1: 		}
rlm@1: 		else
rlm@1: 		{
rlm@1: 			flashState     = FLASH_READ_ARRAY;
rlm@1: 			flashReadState = FLASH_READ_ARRAY;
rlm@1: 		}
rlm@1: 		break;
rlm@1: 	case FLASH_CMD_5:
rlm@1: 		if (byte == 0x30)
rlm@1: 		{
rlm@1: 			// SECTOR ERASE
rlm@1: 			memset(&flashSaveMemory[(flashBank << 16) + (address & 0xF000)],
rlm@1: 			       0,
rlm@1: 			       0x1000);
rlm@1: 			systemSaveUpdateCounter = SYSTEM_SAVE_UPDATED;
rlm@1: 			flashReadState = FLASH_ERASE_COMPLETE;
rlm@1: 		}
rlm@1: 		else if (byte == 0x10)
rlm@1: 		{
rlm@1: 			// CHIP ERASE
rlm@1: 			memset(flashSaveMemory, 0, flashSize);
rlm@1: 			systemSaveUpdateCounter = SYSTEM_SAVE_UPDATED;
rlm@1: 			flashReadState = FLASH_ERASE_COMPLETE;
rlm@1: 		}
rlm@1: 		else
rlm@1: 		{
rlm@1: 			flashState     = FLASH_READ_ARRAY;
rlm@1: 			flashReadState = FLASH_READ_ARRAY;
rlm@1: 		}
rlm@1: 		break;
rlm@1: 	case FLASH_AUTOSELECT:
rlm@1: 		if (byte == 0xF0)
rlm@1: 		{
rlm@1: 			flashState     = FLASH_READ_ARRAY;
rlm@1: 			flashReadState = FLASH_READ_ARRAY;
rlm@1: 		}
rlm@1: 		else if (address == 0x5555 && byte == 0xAA)
rlm@1: 			flashState = FLASH_CMD_1;
rlm@1: 		else
rlm@1: 		{
rlm@1: 			flashState     = FLASH_READ_ARRAY;
rlm@1: 			flashReadState = FLASH_READ_ARRAY;
rlm@1: 		}
rlm@1: 		break;
rlm@1: 	case FLASH_PROGRAM:
rlm@1: 		flashSaveMemory[(flashBank<<16)+address] = byte;
rlm@1: 		systemSaveUpdateCounter = SYSTEM_SAVE_UPDATED;
rlm@1: 		flashState     = FLASH_READ_ARRAY;
rlm@1: 		flashReadState = FLASH_READ_ARRAY;
rlm@1: 		break;
rlm@1: 	case FLASH_SETBANK:
rlm@1: 		if (address == 0)
rlm@1: 		{
rlm@1: 			flashBank = (byte & 1);
rlm@1: 		}
rlm@1: 		flashState     = FLASH_READ_ARRAY;
rlm@1: 		flashReadState = FLASH_READ_ARRAY;
rlm@1: 		break;
rlm@1: 	}
rlm@1: }
rlm@1: