Mercurial > vba-linux

     1 #include <cstdio>

     2 #include <cstring>

     3 

     4 #include "Flash.h"

     5 #include "GBA.h"

     6 #include "GBAGlobals.h"

     7 #include "Sram.h"

     8 #include "../common/System.h"

     9 #include "../common/Util.h"

    10 

    11 #define FLASH_READ_ARRAY         0

    12 #define FLASH_CMD_1              1

    13 #define FLASH_CMD_2              2

    14 #define FLASH_AUTOSELECT         3

    15 #define FLASH_CMD_3              4

    16 #define FLASH_CMD_4              5

    17 #define FLASH_CMD_5              6

    18 #define FLASH_ERASE_COMPLETE     7

    19 #define FLASH_PROGRAM            8

    20 #define FLASH_SETBANK            9

    21 

    22 u8    flashSaveMemory[0x20000 + 4];

    23 int32 flashState          = FLASH_READ_ARRAY;

    24 int32 flashReadState      = FLASH_READ_ARRAY;

    25 int32 flashSize           = 0x10000;

    26 int32 flashDeviceID       = 0x1b;

    27 int32 flashManufacturerID = 0x32;

    28 int32 flashBank           = 0;

    29 

    30 static variable_desc flashSaveData[] = {

    31 	{ &flashState,         sizeof(int32) },

    32 	{ &flashReadState,     sizeof(int32) },

    33 	{ &flashSaveMemory[0],       0x10000 },

    34 	{ NULL,                            0 }

    35 };

    36 

    37 static variable_desc flashSaveData2[] = {

    38 	{ &flashState,         sizeof(int32) },

    39 	{ &flashReadState,     sizeof(int32) },

    40 	{ &flashSize,          sizeof(int32) },

    41 	{ &flashSaveMemory[0],       0x20000 },

    42 	{ NULL,                            0 }

    43 };

    44 

    45 static variable_desc flashSaveData3[] = {

    46 	{ &flashState,         sizeof(int32) },

    47 	{ &flashReadState,     sizeof(int32) },

    48 	{ &flashSize,          sizeof(int32) },

    49 	{ &flashBank,          sizeof(int32) },

    50 	{ &flashSaveMemory[0],       0x20000 },

    51 	{ NULL,                            0 }

    52 };

    53 

    54 void flashReset()

    55 {

    56 	flashState     = FLASH_READ_ARRAY;

    57 	flashReadState = FLASH_READ_ARRAY;

    58 	flashBank      = 0;

    59 }

    60 

    61 void flashErase()

    62 {

    63 	memset(flashSaveMemory, 0, 0x20000*sizeof(u8));

    64 	flashState          = FLASH_READ_ARRAY;

    65 	flashReadState      = FLASH_READ_ARRAY;

    66 	flashSize           = 0x10000;

    67 	flashDeviceID       = 0x1b;

    68 	flashManufacturerID = 0x32;

    69 	flashBank           = 0;

    70 }

    71 

    72 void flashSaveGame(gzFile gzFile)

    73 {

    74 	utilWriteData(gzFile, flashSaveData3);

    75 }

    76 

    77 void flashReadGame(gzFile gzFile, int version)

    78 {

    79 	if (version < SAVE_GAME_VERSION_5)

    80 		utilReadData(gzFile, flashSaveData);

    81 	else if (version < SAVE_GAME_VERSION_7)

    82 	{

    83 		utilReadData(gzFile, flashSaveData2);

    84 		flashBank = 0;

    85 		flashSetSize(flashSize);

    86 	}

    87 	else

    88 	{

    89 		utilReadData(gzFile, flashSaveData3);

    90 	}

    91 }

    92 

    93 void flashSetSize(int size)

    94 {

    95 	//  log("Setting flash size to %d\n", size);

    96 	flashSize = size;

    97 	if (size == 0x10000)

    98 	{

    99 		flashDeviceID       = 0x1b;

   100 		flashManufacturerID = 0x32;

   101 	}

   102 	else

   103 	{

   104 		flashDeviceID       = 0x13; //0x09;

   105 		flashManufacturerID = 0x62; //0xc2;

   106 	}

   107 }

   108 

   109 u8 flashRead(u32 address)

   110 {

   111 	//  log("Reading %08x from %08x\n", address, reg[15].I);

   112 	//  log("Current read state is %d\n", flashReadState);

   113 	address &= 0xFFFF;

   114 

   115 	switch (flashReadState)

   116 	{

   117 	case FLASH_READ_ARRAY:

   118 		return flashSaveMemory[(flashBank << 16) + address];

   119 	case FLASH_AUTOSELECT:

   120 		switch (address & 0xFF)

   121 		{

   122 		case 0:

   123 			// manufacturer ID

   124 			return u8(flashManufacturerID);

   125 		case 1:

   126 			// device ID

   127 			return u8(flashDeviceID);

   128 		}

   129 		break;

   130 	case FLASH_ERASE_COMPLETE:

   131 		flashState     = FLASH_READ_ARRAY;

   132 		flashReadState = FLASH_READ_ARRAY;

   133 		return 0xFF;

   134 	}

   135 	;

   136 	return 0;

   137 }

   138 

   139 void flashSaveDecide(u32 address, u8 byte)

   140 {

   141 	//  log("Deciding save type %08x\n", address);

   142 	if (address == 0x0e005555)

   143 	{

   144 		saveType        = 2;

   145 		cpuSaveGameFunc = flashWrite;

   146 	}

   147 	else

   148 	{

   149 		saveType        = 1;

   150 		cpuSaveGameFunc = sramWrite;

   151 	}

   152 

   153 	(*cpuSaveGameFunc)(address, byte);

   154 }

   155 

   156 void flashWrite(u32 address, u8 byte)

   157 {

   158 	//  log("Writing %02x at %08x\n", byte, address);

   159 	//  log("Current state is %d\n", flashState);

   160 	address &= 0xFFFF;

   161 	switch (flashState)

   162 	{

   163 	case FLASH_READ_ARRAY:

   164 		if (address == 0x5555 && byte == 0xAA)

   165 			flashState = FLASH_CMD_1;

   166 		break;

   167 	case FLASH_CMD_1:

   168 		if (address == 0x2AAA && byte == 0x55)

   169 			flashState = FLASH_CMD_2;

   170 		else

   171 			flashState = FLASH_READ_ARRAY;

   172 		break;

   173 	case FLASH_CMD_2:

   174 		if (address == 0x5555)

   175 		{

   176 			if (byte == 0x90)

   177 			{

   178 				flashState     = FLASH_AUTOSELECT;

   179 				flashReadState = FLASH_AUTOSELECT;

   180 			}

   181 			else if (byte == 0x80)

   182 			{

   183 				flashState = FLASH_CMD_3;

   184 			}

   185 			else if (byte == 0xF0)

   186 			{

   187 				flashState     = FLASH_READ_ARRAY;

   188 				flashReadState = FLASH_READ_ARRAY;

   189 			}

   190 			else if (byte == 0xA0)

   191 			{

   192 				flashState = FLASH_PROGRAM;

   193 			}

   194 			else if (byte == 0xB0 && flashSize == 0x20000)

   195 			{

   196 				flashState = FLASH_SETBANK;

   197 			}

   198 			else

   199 			{

   200 				flashState     = FLASH_READ_ARRAY;

   201 				flashReadState = FLASH_READ_ARRAY;

   202 			}

   203 		}

   204 		else

   205 		{

   206 			flashState     = FLASH_READ_ARRAY;

   207 			flashReadState = FLASH_READ_ARRAY;

   208 		}

   209 		break;

   210 	case FLASH_CMD_3:

   211 		if (address == 0x5555 && byte == 0xAA)

   212 		{

   213 			flashState = FLASH_CMD_4;

   214 		}

   215 		else

   216 		{

   217 			flashState     = FLASH_READ_ARRAY;

   218 			flashReadState = FLASH_READ_ARRAY;

   219 		}

   220 		break;

   221 	case FLASH_CMD_4:

   222 		if (address == 0x2AAA && byte == 0x55)

   223 		{

   224 			flashState = FLASH_CMD_5;

   225 		}

   226 		else

   227 		{

   228 			flashState     = FLASH_READ_ARRAY;

   229 			flashReadState = FLASH_READ_ARRAY;

   230 		}

   231 		break;

   232 	case FLASH_CMD_5:

   233 		if (byte == 0x30)

   234 		{

   235 			// SECTOR ERASE

   236 			memset(&flashSaveMemory[(flashBank << 16) + (address & 0xF000)],

   237 			       0,

   238 			       0x1000);

   239 			systemSaveUpdateCounter = SYSTEM_SAVE_UPDATED;

   240 			flashReadState = FLASH_ERASE_COMPLETE;

   241 		}

   242 		else if (byte == 0x10)

   243 		{

   244 			// CHIP ERASE

   245 			memset(flashSaveMemory, 0, flashSize);

   246 			systemSaveUpdateCounter = SYSTEM_SAVE_UPDATED;

   247 			flashReadState = FLASH_ERASE_COMPLETE;

   248 		}

   249 		else

   250 		{

   251 			flashState     = FLASH_READ_ARRAY;

   252 			flashReadState = FLASH_READ_ARRAY;

   253 		}

   254 		break;

   255 	case FLASH_AUTOSELECT:

   256 		if (byte == 0xF0)

   257 		{

   258 			flashState     = FLASH_READ_ARRAY;

   259 			flashReadState = FLASH_READ_ARRAY;

   260 		}

   261 		else if (address == 0x5555 && byte == 0xAA)

   262 			flashState = FLASH_CMD_1;

   263 		else

   264 		{

   265 			flashState     = FLASH_READ_ARRAY;

   266 			flashReadState = FLASH_READ_ARRAY;

   267 		}

   268 		break;

   269 	case FLASH_PROGRAM:

   270 		flashSaveMemory[(flashBank<<16)+address] = byte;

   271 		systemSaveUpdateCounter = SYSTEM_SAVE_UPDATED;

   272 		flashState     = FLASH_READ_ARRAY;

   273 		flashReadState = FLASH_READ_ARRAY;

   274 		break;

   275 	case FLASH_SETBANK:

   276 		if (address == 0)

   277 		{

   278 			flashBank = (byte & 1);

   279 		}

   280 		flashState     = FLASH_READ_ARRAY;

   281 		flashReadState = FLASH_READ_ARRAY;

   282 		break;

   283 	}

   284 }

   285
author	Robert McIntyre <rlm@mit.edu>
date	Sun, 04 Mar 2012 14:33:52 -0600
parents	f9f4f1b99eed
children