initial commit

1 files changed, 166 insertions, 0 deletions

diff --git a/src/agb_flash_mx.c b/src/agb_flash_mx.c
new file mode 100644
index 0000000..50df609
--- /dev/null
+++ b/src/agb_flash_mx.c
@@ -0,0 +1,166 @@
+#include "gba/gba.h"
+#include "gba/flash_internal.h"
+
+const u16 mxMaxTime[] =
+{
+      10, 65469, TIMER_ENABLE | TIMER_INTR_ENABLE | TIMER_256CLK,
+      10, 65469, TIMER_ENABLE | TIMER_INTR_ENABLE | TIMER_256CLK,
+    2000, 65469, TIMER_ENABLE | TIMER_INTR_ENABLE | TIMER_256CLK,
+    2000, 65469, TIMER_ENABLE | TIMER_INTR_ENABLE | TIMER_256CLK,
+};
+
+const struct FlashSetupInfo MX29L010 =
+{
+    ProgramFlashSector_MX,
+    EraseFlashChip_MX,
+    EraseFlashSector_MX,
+    WaitForFlashWrite_Common,
+    mxMaxTime,
+    {
+        131072, // ROM size
+        {
+            4096, // sector size
+              12, // bit shift to multiply by sector size (4096 == 1 << 12)
+              32, // number of sectors
+               0  // appears to be unused
+        },
+        { 3, 1 }, // wait state setup data
+        { { 0xC2, 0x09 } } // ID
+    }
+};
+
+const struct FlashSetupInfo DefaultFlash =
+{
+    ProgramFlashSector_MX,
+    EraseFlashChip_MX,
+    EraseFlashSector_MX,
+    WaitForFlashWrite_Common,
+    mxMaxTime,
+    {
+        131072, // ROM size
+        {
+            4096, // sector size
+              12, // bit shift to multiply by sector size (4096 == 1 << 12)
+              32, // number of sectors
+               0  // appears to be unused
+        },
+        { 3, 1 }, // wait state setup data
+        { { 0x00, 0x00 } } // ID of 0
+    }
+};
+
+u16 EraseFlashChip_MX(void)
+{
+    u16 result;
+    u16 readFlash1Buffer[0x20];
+
+    REG_WAITCNT = (REG_WAITCNT & ~WAITCNT_SRAM_MASK) | gFlash->wait[0];
+
+    FLASH_WRITE(0x5555, 0xAA);
+    FLASH_WRITE(0x2AAA, 0x55);
+    FLASH_WRITE(0x5555, 0x80);
+    FLASH_WRITE(0x5555, 0xAA);
+    FLASH_WRITE(0x2AAA, 0x55);
+    FLASH_WRITE(0x5555, 0x10);
+
+    SetReadFlash1(readFlash1Buffer);
+
+    result = WaitForFlashWrite(3, FLASH_BASE, 0xFF);
+
+    REG_WAITCNT = (REG_WAITCNT & ~WAITCNT_SRAM_MASK) | WAITCNT_SRAM_8;
+
+    return result;
+}
+
+u16 EraseFlashSector_MX(u16 sectorNum)
+{
+    u16 numTries;
+    u16 result;
+    u8 *addr;
+    u16 readFlash1Buffer[0x20];
+
+    if (sectorNum >= gFlash->sector.count)
+        return 0x80FF;
+
+    SwitchFlashBank(sectorNum / SECTORS_PER_BANK);
+    sectorNum %= SECTORS_PER_BANK;
+
+    numTries = 0;
+
+try_erase:
+    REG_WAITCNT = (REG_WAITCNT & ~WAITCNT_SRAM_MASK) | gFlash->wait[0];
+
+    addr = FLASH_BASE + (sectorNum << gFlash->sector.shift);
+
+    FLASH_WRITE(0x5555, 0xAA);
+    FLASH_WRITE(0x2AAA, 0x55);
+    FLASH_WRITE(0x5555, 0x80);
+    FLASH_WRITE(0x5555, 0xAA);
+    FLASH_WRITE(0x2AAA, 0x55);
+    *addr = 0x30;
+
+    SetReadFlash1(readFlash1Buffer);
+
+    result = WaitForFlashWrite(2, addr, 0xFF);
+
+    if (!(result & 0xA000) || numTries != 0)
+        goto done;
+
+    numTries = 1;
+
+    goto try_erase;
+
+done:
+    REG_WAITCNT = (REG_WAITCNT & ~WAITCNT_SRAM_MASK) | WAITCNT_SRAM_8;
+
+    return result;
+}
+
+static u16 ProgramByte(u8 *src, u8 *dest)
+{
+    FLASH_WRITE(0x5555, 0xAA);
+    FLASH_WRITE(0x2AAA, 0x55);
+    FLASH_WRITE(0x5555, 0xA0);
+    *dest = *src;
+
+    return WaitForFlashWrite(1, dest, *src);
+}
+
+u16 ProgramFlashSector_MX(u16 sectorNum, u8 *src)
+{
+    u16 result;
+    u8 *dest;
+    u16 readFlash1Buffer[0x20];
+
+    if (sectorNum >= gFlash->sector.count)
+        return 0x80FF;
+
+    result = EraseFlashSector_MX(sectorNum);
+
+    if (result != 0)
+        return result;
+
+    SwitchFlashBank(sectorNum / SECTORS_PER_BANK);
+    sectorNum %= SECTORS_PER_BANK;
+
+    SetReadFlash1(readFlash1Buffer);
+
+    REG_WAITCNT = (REG_WAITCNT & ~WAITCNT_SRAM_MASK) | gFlash->wait[0];
+
+    gFlashNumRemainingBytes = gFlash->sector.size;
+    dest = FLASH_BASE + (sectorNum << gFlash->sector.shift);
+
+    while (gFlashNumRemainingBytes > 0)
+    {
+        result = ProgramByte(src, dest);
+
+        if (result != 0)
+            break;
+
+        gFlashNumRemainingBytes--;
+        src++;
+        dest++;
+    }
+
+    return result;
+}