o add snes fatfs dummy

o add fatfs custom chip to bsnes o finishes fatfs linux backend smaple
2009-05-26 17:07:39 +02:00
parent 0fd42d7b1d
commit 660767c464
33 changed files with 1241 additions and 121 deletions
--- a/tools/bsnes/chip/fatfs/fatfs.cpp
+++ b/tools/bsnes/chip/fatfs/fatfs.cpp
@@ -0,0 +1,116 @@
+#include <../base.hpp>
+#include <../cart/cart.hpp>
+#include "fatfs.hpp"
+
+
+#include "diskio.h"
+
+#define CMD_INIT        0x00
+#define CMD_READ        0x01
+#define CMD_WRITE       0x02
+#define CMD_NONE        0xff
+
+#define SHARED_SIZE     512
+#define SHARED_ADDR     0x3f0000
+
+void FATFS::init() {
+  command = CMD_NONE;
+  sector = 0;
+  count = 0;
+  retval = -1;
+  scratch_buffer = (char*)malloc(SHARED_SIZE);
+}
+
+void FATFS::enable() {
+  // command
+  memory::mmio.map(0x3010, *this);
+  // sector
+  memory::mmio.map(0x3011, *this);
+  memory::mmio.map(0x3012, *this);
+  memory::mmio.map(0x3013, *this);
+  memory::mmio.map(0x3014, *this);
+  // offset
+  memory::mmio.map(0x3015, *this);
+  // return value
+  memory::mmio.map(0x3016, *this);
+}
+
+void FATFS::power() {
+  reset();
+}
+
+void FATFS::reset() {
+}
+
+
+void FATFS::fetchMem() {
+  for ( int i=0;i<SHARED_SIZE;i++){
+      scratch_buffer[i] = bus.read(SHARED_ADDR + i);
+  } 
+}
+
+void FATFS::pushMem() {
+  for ( int i=0;i<SHARED_SIZE;i++){
+      bus.write(SHARED_ADDR + i,scratch_buffer[i]);
+  }
+}
+
+uint8 FATFS::mmio_read(unsigned addr) {
+  addr &= 0xffff;
+  if (addr == 0x3016){
+      printf("FATFS::mmio_read retal=%i\n",retval);
+      return retval;
+  }
+  return cpu.regs.mdr;
+}
+
+void FATFS::mmio_write(unsigned addr, uint8 data) {
+  addr &= 0xffff;
+  printf("FATFS::mmio_write 0x%04x 0x%02x (%i)\n",addr,data,data);
+  if (addr == 0x3010){
+      switch(data){
+          case CMD_INIT:
+              printf("FATFS::mmio_write CMD_INIT \n");
+              command = CMD_INIT;
+              disk_initialize(0);
+              break;
+          case CMD_READ:
+              printf("FATFS::mmio_write CMD_READ \n");
+              command = CMD_READ;
+              break;
+          case CMD_WRITE:
+              command = CMD_WRITE;
+              printf("FATFS::mmio_write CMD_WRITE \n");
+              break;
+          default:
+              command = CMD_NONE;
+              printf("FATFS::mmio_write CMD_NONE \n");
+              break;
+      }
+      fflush(stderr);
+  }
+  if (addr >= 0x3011 && addr <= 0x3014){
+      sector = data << ( (3 - ( addr - 0x3011))  << 3);
+      printf("FATFS::mmio_write set sector: byte=%i val=%i sector=%i \n",(3 - ( addr - 0x3011)),data,sector);
+  }
+  if (addr == 0x3015){
+      count = data;
+      printf("FATFS::mmio_write set offset: countr=%i \n",count);
+      if (command == CMD_READ) {
+          retval = disk_read (0, (BYTE*)scratch_buffer, sector, count);
+          if (!retval)
+              pushMem();
+      } else if (command == CMD_WRITE) {
+            fetchMem();
+            retval = disk_write (0, (BYTE*)scratch_buffer, sector, count);
+      } else{
+            printf("FATFS::mmio_write set offset: no command to trigger \n");
+      }
+  }
+  if (addr == 0x3016){
+      printf("FATFS::mmio_write reg 0x3016 retav is RW\n");
+  }
+}
+
+FATFS::FATFS() {
+}