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|
/*
io_fcsr.c based on
compact_flash.c
By chishm (Michael Chisholm)
Hardware Routines for using a GBA Flash Cart and SRAM as a
block device.
This software is completely free. No warranty is provided.
If you use it, please give me credit and email me about your
project at chishm@hotmail.com
See gba_nds_fat.txt for help and license details.
The file system must be 512 byte aligned, in cart address space.
SRAM is supported.
*/
#include "io_fcsr.h"
#ifdef SUPPORT_FCSR
#include <string.h>
//---------------------------------------------------------------
// DMA
#ifdef _CF_USE_DMA
#ifndef NDS
#include "gba_dma.h"
#else
#include <nds/dma.h>
#ifdef ARM9
#include <nds/arm9/cache.h>
#endif
#endif
#endif
#ifdef NDS
#define SRAM_START 0x0A000000
#else
#define SRAM_START 0x0E000000
#endif
#define NO_SRAM 0xFFFFFFFF
#define FCSR 0x52534346
const char FCSR_LabelString[] = " Chishm FAT";
u8* FCSR_FileSysPointer = 0;
u8* FCSR_SramSectorPointer[4] = {0,0,0,0};
u32 FCSR_SramSectorStart[4] = {0,0,0,0};
u32 FCSR_SramSectorEnd[4] = {0,0,0,0};
/*-----------------------------------------------------------------
FCSR_IsInserted
Is a GBA Flash Cart with a valid file system inserted?
bool return OUT: true if a GBA FC card is inserted
-----------------------------------------------------------------*/
bool FCSR_IsInserted (void)
{
bool flagFoundFileSys = false;
u32* fileSysPointer = (u32*)0x08000100; // Start at beginning of cart address space, offset by expected location of string
// Search for file system
while ((fileSysPointer < (u32*)0x0A000000) && !flagFoundFileSys) // Only search while not at end of cart address space
{
while ((*fileSysPointer != FCSR) && (fileSysPointer < (u32*)0x0A000000))
fileSysPointer += 0x40;
if ((strncmp(FCSR_LabelString, (char*)(fileSysPointer + 1), 12) == 0) && (fileSysPointer < (u32*)0x0A000000))
{
flagFoundFileSys = true;
} else {
fileSysPointer += 0x80;
}
}
return flagFoundFileSys;
}
/*-----------------------------------------------------------------
FCSR_ClearStatus
Finish any pending operations
bool return OUT: always true for GBA FC
-----------------------------------------------------------------*/
bool FCSR_ClearStatus (void)
{
return true;
}
/*-----------------------------------------------------------------
FCSR_ReadSectors
Read 512 byte sector numbered "sector" into "buffer"
u32 sector IN: address of first 512 byte sector on Flash Cart to read
u8 numSecs IN: number of 512 byte sectors to read,
1 to 256 sectors can be read, 0 = 256
void* buffer OUT: pointer to 512 byte buffer to store data in
bool return OUT: true if successful
-----------------------------------------------------------------*/
bool FCSR_ReadSectors (u32 sector, u8 numSecs, void* buffer)
{
int i;
bool flagSramSector = false;
int numSectors = (numSecs > 0 ? numSecs : 256);
int readLength = numSectors * BYTE_PER_READ;
u8* src;;
u8* dst;
// Find which region this read is in
for (i = 0; (i < 4) && !flagSramSector; i++)
{
if ((sector >= FCSR_SramSectorStart[i]) && (sector < FCSR_SramSectorEnd[i]))
{
flagSramSector = true;
break;
}
}
// Make sure read will be completely in SRAM range if it is partially there
if ( flagSramSector && ((sector + numSectors) > FCSR_SramSectorEnd[i]))
return false;
// Copy data to buffer
if (flagSramSector)
{
src = FCSR_SramSectorPointer[i] + (sector - FCSR_SramSectorStart[i]) * BYTE_PER_READ;
} else {
src = FCSR_FileSysPointer + sector * BYTE_PER_READ;
}
dst = (u8*)buffer;
if (flagSramSector)
{
while (readLength--)
{
*dst++ = *src++;
}
} else { // Reading from Cart ROM
#ifdef _CF_USE_DMA
#ifdef NDS
#ifdef ARM9
DC_FlushRange( buffer, readLength);
#endif // ARM9
DMA3_SRC = (u32)src;
DMA3_DEST = (u32)buffer;
DMA3_CR = (readLength >> 1) | DMA_COPY_HALFWORDS;
#else // ! NDS
DMA3COPY ( src, buffer, (readLength >> 1) | DMA16 | DMA_ENABLE);
#endif // NDS
#else // !_CF_USE_DMA
memcpy (buffer, src, readLength);
#endif // _CF_USE_DMA
} // if (flagSramSector)
return true;
}
/*-----------------------------------------------------------------
FCSR_WriteSectors
Write 512 byte sector numbered "sector" from "buffer"
u32 sector IN: address of 512 byte sector on Flash Cart to read
u8 numSecs IN: number of 512 byte sectors to read,
1 to 256 sectors can be read, 0 = 256
void* buffer IN: pointer to 512 byte buffer to read data from
bool return OUT: true if successful
-----------------------------------------------------------------*/
bool FCSR_WriteSectors (u32 sector, u8 numSecs, void* buffer)
{
int i;
bool flagSramSector = false;
int writeLength = (numSecs > 0 ? numSecs : 256) * BYTE_PER_READ;
u8* src = (u8*) buffer;
u8* dst;
// Find which region this sector belongs in
for (i = 0; (i < 4) && !flagSramSector; i++)
{
if ((sector >= FCSR_SramSectorStart[i]) && (sector < FCSR_SramSectorEnd[i]))
{
flagSramSector = true;
break;
}
}
if (!flagSramSector)
return false;
// Entire write must be within an SRAM region
if ((sector + (numSecs > 0 ? numSecs : 256)) > FCSR_SramSectorEnd[i])
return false;
// Copy data to SRAM
dst = FCSR_SramSectorPointer[i] + (sector - FCSR_SramSectorStart[i]) * BYTE_PER_READ;
while (writeLength--)
{
*dst++ = *src++;
}
return true;
}
/*-----------------------------------------------------------------
FCSR_Shutdown
unload the Flash Cart interface
-----------------------------------------------------------------*/
bool FCSR_Shutdown(void)
{
int i;
if (FCSR_ClearStatus() == false)
return false;
FCSR_FileSysPointer = 0;
for (i=0; i < 4; i++)
{
FCSR_SramSectorPointer[i] = 0;
FCSR_SramSectorStart[i] = 0;
FCSR_SramSectorEnd[i] = 0;
}
return true;
}
/*-----------------------------------------------------------------
FCSR_StartUp
initializes the Flash Cart interface, returns true if successful,
otherwise returns false
-----------------------------------------------------------------*/
bool FCSR_StartUp(void)
{
bool flagFoundFileSys = false;
int i;
int SramRegionSize[4];
u8* srcByte;
u8* destByte;
u32* fileSysPointer = (u32*)0x08000100; // Start at beginning of cart address space, offset by expected location of string
// Search for file system
while ((fileSysPointer < (u32*)0x0A000000) && !flagFoundFileSys) // Only search while not at end of cart address space
{
while ((*fileSysPointer != FCSR) && (fileSysPointer < (u32*)0x0A000000))
fileSysPointer += 0x40;
if ((strncmp(FCSR_LabelString, (char*)(fileSysPointer + 1), 12) == 0) && (fileSysPointer < (u32*)0x0A000000))
{
flagFoundFileSys = true;
} else {
fileSysPointer += 0x80;
}
}
if (!flagFoundFileSys)
return false;
// Flash cart file system pointer has been found
FCSR_FileSysPointer = (u8*)(fileSysPointer - 0x40);
// Get SRAM sector regions from header block
for (i = 0; i < 4; i++)
{
FCSR_SramSectorStart[i] = fileSysPointer[i+4];
SramRegionSize[i] = fileSysPointer[i+8];
FCSR_SramSectorEnd[i] = FCSR_SramSectorStart[i] + SramRegionSize[i];
}
// Calculate SRAM region pointers
FCSR_SramSectorPointer[0] = (u8*)(SRAM_START + 4);
for (i = 1; i < 4; i++)
{
FCSR_SramSectorPointer[i] = FCSR_SramSectorPointer[i-1] + (SramRegionSize[i-1] * BYTE_PER_READ);
}
// Initialise SRAM with overlay if it hasn't been done so
if ( (*((u8*)SRAM_START) != 'F') || (*((u8*)(SRAM_START+1)) != 'C') || (*((u8*)(SRAM_START+2)) != 'S') || (*((u8*)(SRAM_START+3)) != 'R') )
{
*((u8*)SRAM_START) = 'F';
*((u8*)(SRAM_START+1)) = 'C';
*((u8*)(SRAM_START+2)) = 'S';
*((u8*)(SRAM_START+3)) = 'R';
for (i = 0; i < 4; i++)
{
srcByte = FCSR_FileSysPointer + (FCSR_SramSectorStart[i] * BYTE_PER_READ);
destByte = FCSR_SramSectorPointer[i];
while (srcByte < FCSR_FileSysPointer + (FCSR_SramSectorEnd[i] * BYTE_PER_READ) )
*destByte++ = *srcByte++;
}
}
// Get SRAM sector regions from header block
for (i = 0; i < 4; i++)
{
if (SramRegionSize[i] == 0)
{
FCSR_SramSectorStart[i] = NO_SRAM;
FCSR_SramSectorEnd[i] = NO_SRAM;
}
}
return true;
}
/*-----------------------------------------------------------------
the actual interface structure
-----------------------------------------------------------------*/
IO_INTERFACE io_fcsr = {
DEVICE_TYPE_FCSR, // 'FCSR'
FEATURE_MEDIUM_CANREAD | FEATURE_MEDIUM_CANWRITE | FEATURE_SLOT_GBA,
(FN_MEDIUM_STARTUP)&FCSR_StartUp,
(FN_MEDIUM_ISINSERTED)&FCSR_IsInserted,
(FN_MEDIUM_READSECTORS)&FCSR_ReadSectors,
(FN_MEDIUM_WRITESECTORS)&FCSR_WriteSectors,
(FN_MEDIUM_CLEARSTATUS)&FCSR_ClearStatus,
(FN_MEDIUM_SHUTDOWN)&FCSR_Shutdown
} ;
/*-----------------------------------------------------------------
FCSR_GetInterface
returns the interface structure to host
-----------------------------------------------------------------*/
LPIO_INTERFACE FCSR_GetInterface(void) {
return &io_fcsr ;
} ;
#endif // SUPPORT_FCSR
/*
io_fcsr.c based on
compact_flash.c
By chishm (Michael Chisholm)
Hardware Routines for using a GBA Flash Cart and SRAM as a
block device.
This software is completely free. No warranty is provided.
If you use it, please give me credit and email me about your
project at chishm@hotmail.com
See gba_nds_fat.txt for help and license details.
The file system must be 512 byte aligned, in cart address space.
SRAM is supported.
*/
#include "io_fcsr.h"
#ifdef SUPPORT_FCSR
#include <string.h>
//---------------------------------------------------------------
// DMA
#ifdef _CF_USE_DMA
#ifndef NDS
#include "gba_dma.h"
#else
#include <nds/dma.h>
#ifdef ARM9
#include <nds/arm9/cache.h>
#endif
#endif
#endif
#ifdef NDS
#define SRAM_START 0x0A000000
#else
#define SRAM_START 0x0E000000
#endif
#define NO_SRAM 0xFFFFFFFF
#define FCSR 0x52534346
const char FCSR_LabelString[] = " Chishm FAT";
u8* FCSR_FileSysPointer = 0;
u8* FCSR_SramSectorPointer[4] = {0,0,0,0};
u32 FCSR_SramSectorStart[4] = {0,0,0,0};
u32 FCSR_SramSectorEnd[4] = {0,0,0,0};
/*-----------------------------------------------------------------
FCSR_IsInserted
Is a GBA Flash Cart with a valid file system inserted?
bool return OUT: true if a GBA FC card is inserted
-----------------------------------------------------------------*/
bool FCSR_IsInserted (void)
{
bool flagFoundFileSys = false;
u32* fileSysPointer = (u32*)0x08000100; // Start at beginning of cart address space, offset by expected location of string
// Search for file system
while ((fileSysPointer < (u32*)0x0A000000) && !flagFoundFileSys) // Only search while not at end of cart address space
{
while ((*fileSysPointer != FCSR) && (fileSysPointer < (u32*)0x0A000000))
fileSysPointer += 0x40;
if ((strncmp(FCSR_LabelString, (char*)(fileSysPointer + 1), 12) == 0) && (fileSysPointer < (u32*)0x0A000000))
{
flagFoundFileSys = true;
} else {
fileSysPointer += 0x80;
}
}
return flagFoundFileSys;
}
/*-----------------------------------------------------------------
FCSR_ClearStatus
Finish any pending operations
bool return OUT: always true for GBA FC
-----------------------------------------------------------------*/
bool FCSR_ClearStatus (void)
{
return true;
}
/*-----------------------------------------------------------------
FCSR_ReadSectors
Read 512 byte sector numbered "sector" into "buffer"
u32 sector IN: address of first 512 byte sector on Flash Cart to read
u8 numSecs IN: number of 512 byte sectors to read,
1 to 256 sectors can be read, 0 = 256
void* buffer OUT: pointer to 512 byte buffer to store data in
bool return OUT: true if successful
-----------------------------------------------------------------*/
bool FCSR_ReadSectors (u32 sector, u8 numSecs, void* buffer)
{
int i;
bool flagSramSector = false;
int numSectors = (numSecs > 0 ? numSecs : 256);
int readLength = numSectors * BYTE_PER_READ;
u8* src;;
u8* dst;
// Find which region this read is in
for (i = 0; (i < 4) && !flagSramSector; i++)
{
if ((sector >= FCSR_SramSectorStart[i]) && (sector < FCSR_SramSectorEnd[i]))
{
flagSramSector = true;
break;
}
}
// Make sure read will be completely in SRAM range if it is partially there
if ( flagSramSector && ((sector + numSectors) > FCSR_SramSectorEnd[i]))
return false;
// Copy data to buffer
if (flagSramSector)
{
src = FCSR_SramSectorPointer[i] + (sector - FCSR_SramSectorStart[i]) * BYTE_PER_READ;
} else {
src = FCSR_FileSysPointer + sector * BYTE_PER_READ;
}
dst = (u8*)buffer;
if (flagSramSector)
{
while (readLength--)
{
*dst++ = *src++;
}
} else { // Reading from Cart ROM
#ifdef _CF_USE_DMA
#ifdef NDS
#ifdef ARM9
DC_FlushRange( buffer, readLength);
#endif // ARM9
DMA3_SRC = (u32)src;
DMA3_DEST = (u32)buffer;
DMA3_CR = (readLength >> 1) | DMA_COPY_HALFWORDS;
#else // ! NDS
DMA3COPY ( src, buffer, (readLength >> 1) | DMA16 | DMA_ENABLE);
#endif // NDS
#else // !_CF_USE_DMA
memcpy (buffer, src, readLength);
#endif // _CF_USE_DMA
} // if (flagSramSector)
return true;
}
/*-----------------------------------------------------------------
FCSR_WriteSectors
Write 512 byte sector numbered "sector" from "buffer"
u32 sector IN: address of 512 byte sector on Flash Cart to read
u8 numSecs IN: number of 512 byte sectors to read,
1 to 256 sectors can be read, 0 = 256
void* buffer IN: pointer to 512 byte buffer to read data from
bool return OUT: true if successful
-----------------------------------------------------------------*/
bool FCSR_WriteSectors (u32 sector, u8 numSecs, void* buffer)
{
int i;
bool flagSramSector = false;
int writeLength = (numSecs > 0 ? numSecs : 256) * BYTE_PER_READ;
u8* src = (u8*) buffer;
u8* dst;
// Find which region this sector belongs in
for (i = 0; (i < 4) && !flagSramSector; i++)
{
if ((sector >= FCSR_SramSectorStart[i]) && (sector < FCSR_SramSectorEnd[i]))
{
flagSramSector = true;
break;
}
}
if (!flagSramSector)
return false;
// Entire write must be within an SRAM region
if ((sector + (numSecs > 0 ? numSecs : 256)) > FCSR_SramSectorEnd[i])
return false;
// Copy data to SRAM
dst = FCSR_SramSectorPointer[i] + (sector - FCSR_SramSectorStart[i]) * BYTE_PER_READ;
while (writeLength--)
{
*dst++ = *src++;
}
return true;
}
/*-----------------------------------------------------------------
FCSR_Shutdown
unload the Flash Cart interface
-----------------------------------------------------------------*/
bool FCSR_Shutdown(void)
{
int i;
if (FCSR_ClearStatus() == false)
return false;
FCSR_FileSysPointer = 0;
for (i=0; i < 4; i++)
{
FCSR_SramSectorPointer[i] = 0;
FCSR_SramSectorStart[i] = 0;
FCSR_SramSectorEnd[i] = 0;
}
return true;
}
/*-----------------------------------------------------------------
FCSR_StartUp
initializes the Flash Cart interface, returns true if successful,
otherwise returns false
-----------------------------------------------------------------*/
bool FCSR_StartUp(void)
{
bool flagFoundFileSys = false;
int i;
int SramRegionSize[4];
u8* srcByte;
u8* destByte;
u32* fileSysPointer = (u32*)0x08000100; // Start at beginning of cart address space, offset by expected location of string
// Search for file system
while ((fileSysPointer < (u32*)0x0A000000) && !flagFoundFileSys) // Only search while not at end of cart address space
{
while ((*fileSysPointer != FCSR) && (fileSysPointer < (u32*)0x0A000000))
fileSysPointer += 0x40;
if ((strncmp(FCSR_LabelString, (char*)(fileSysPointer + 1), 12) == 0) && (fileSysPointer < (u32*)0x0A000000))
{
flagFoundFileSys = true;
} else {
fileSysPointer += 0x80;
}
}
if (!flagFoundFileSys)
return false;
// Flash cart file system pointer has been found
FCSR_FileSysPointer = (u8*)(fileSysPointer - 0x40);
// Get SRAM sector regions from header block
for (i = 0; i < 4; i++)
{
FCSR_SramSectorStart[i] = fileSysPointer[i+4];
SramRegionSize[i] = fileSysPointer[i+8];
FCSR_SramSectorEnd[i] = FCSR_SramSectorStart[i] + SramRegionSize[i];
}
// Calculate SRAM region pointers
FCSR_SramSectorPointer[0] = (u8*)(SRAM_START + 4);
for (i = 1; i < 4; i++)
{
FCSR_SramSectorPointer[i] = FCSR_SramSectorPointer[i-1] + (SramRegionSize[i-1] * BYTE_PER_READ);
}
// Initialise SRAM with overlay if it hasn't been done so
if ( (*((u8*)SRAM_START) != 'F') || (*((u8*)(SRAM_START+1)) != 'C') || (*((u8*)(SRAM_START+2)) != 'S') || (*((u8*)(SRAM_START+3)) != 'R') )
{
*((u8*)SRAM_START) = 'F';
*((u8*)(SRAM_START+1)) = 'C';
*((u8*)(SRAM_START+2)) = 'S';
*((u8*)(SRAM_START+3)) = 'R';
for (i = 0; i < 4; i++)
{
srcByte = FCSR_FileSysPointer + (FCSR_SramSectorStart[i] * BYTE_PER_READ);
destByte = FCSR_SramSectorPointer[i];
while (srcByte < FCSR_FileSysPointer + (FCSR_SramSectorEnd[i] * BYTE_PER_READ) )
*destByte++ = *srcByte++;
}
}
// Get SRAM sector regions from header block
for (i = 0; i < 4; i++)
{
if (SramRegionSize[i] == 0)
{
FCSR_SramSectorStart[i] = NO_SRAM;
FCSR_SramSectorEnd[i] = NO_SRAM;
}
}
return true;
}
/*-----------------------------------------------------------------
the actual interface structure
-----------------------------------------------------------------*/
IO_INTERFACE io_fcsr = {
DEVICE_TYPE_FCSR, // 'FCSR'
FEATURE_MEDIUM_CANREAD | FEATURE_MEDIUM_CANWRITE | FEATURE_SLOT_GBA,
(FN_MEDIUM_STARTUP)&FCSR_StartUp,
(FN_MEDIUM_ISINSERTED)&FCSR_IsInserted,
(FN_MEDIUM_READSECTORS)&FCSR_ReadSectors,
(FN_MEDIUM_WRITESECTORS)&FCSR_WriteSectors,
(FN_MEDIUM_CLEARSTATUS)&FCSR_ClearStatus,
(FN_MEDIUM_SHUTDOWN)&FCSR_Shutdown
} ;
/*-----------------------------------------------------------------
FCSR_GetInterface
returns the interface structure to host
-----------------------------------------------------------------*/
LPIO_INTERFACE FCSR_GetInterface(void) {
return &io_fcsr ;
} ;
#endif // SUPPORT_FCSR
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