integrate SPI EEPROM

pico/carthw/carthw.c

@@ -8,6 +8,7 @@
 
 #include "../pico_int.h"
 #include "../memory.h"
+#include "eeprom_spi.h"
 
 
 /* The SSFII mapper */
@@ -270,6 +271,7 @@ static carthw_state_chunk carthw_pier_state[] =
 {
   { CHUNK_CARTHW,     sizeof(pier_regs),      pier_regs },
   { CHUNK_CARTHW + 1, sizeof(pier_dump_prot), &pier_dump_prot },
+  { CHUNK_CARTHW + 2, 0,                      NULL }, // filled later
   { 0,                0,                      NULL }
 };
 
@@ -308,7 +310,8 @@ static void carthw_pier_write8(u32 a, u32 d)
       base = d << 19;
       goto do_map;
     case 0x09:
-      // TODO
+      SRam.changed = 1;
+      eeprom_spi_write(d);
       break;
     case 0x0b:
       // eeprom read
@@ -346,7 +349,7 @@ static u32 carthw_pier_read8(u32 a)
     return PicoRead8_io(a);
 
   if (a == 0xa1300b)
-    return 0; // TODO
+    return eeprom_spi_read(a);
 
   elprintf(EL_UIO, "pier r8  [%06x] @%06x", a, SekPc);
   return 0;
@@ -415,10 +418,13 @@ static void carthw_pier_reset(void)
   pier_regs[1] = pier_regs[2] = pier_regs[3] = 0;
   pier_dump_prot = 3;
   carthw_pier_statef();
+  eeprom_spi_init(NULL);
 }
 
 void carthw_pier_startup(void)
 {
+  void *eeprom_state;
+  int eeprom_size = 0;
   int i;
 
   elprintf(EL_STATUS, "Pier Solar mapper startup");
@@ -434,6 +440,16 @@ void carthw_pier_startup(void)
   for (i = 0; i < M68K_BANK_SIZE; i += 0x8000)
     memcpy(Pico.rom + Pico.romsize + i, Pico.rom, 0x8000);
 
+  // save EEPROM
+  eeprom_state = eeprom_spi_init(&eeprom_size);
+  SRam.flags = 0;
+  SRam.size = 0x10000;
+  SRam.data = calloc(1, SRam.size);
+  if (!SRam.data)
+    SRam.size = 0;
+  carthw_pier_state[2].ptr = eeprom_state;
+  carthw_pier_state[2].size = eeprom_size;
+
   PicoCartMemSetup  = carthw_pier_mem_setup;
   PicoResetHook     = carthw_pier_reset;
   PicoLoadStateHook = carthw_pier_statef;
@@ -679,3 +695,4 @@ void carthw_prot_lk3_startup(void)
   PicoCartMemSetup = carthw_prot_lk3_mem_setup;
 }
 
+// vim:ts=2:sw=2:expandtab

pico/carthw/eeprom_spi.c

@@ -36,7 +36,9 @@
  *
  ****************************************************************************************/
 
-#include "shared.h"
+#include "../pico_int.h"
+#include "../cd/genplus_macros.h"
+#include "eeprom_spi.h"
 
 /* max supported size 64KB (25x512/95x512) */
 #define SIZE_MASK 0xffff
@@ -72,16 +74,16 @@ typedef struct
 
 static T_EEPROM_SPI spi_eeprom;
 
-void eeprom_spi_init()
+void *eeprom_spi_init(int *size)
 {
   /* reset eeprom state */
   memset(&spi_eeprom, 0, sizeof(T_EEPROM_SPI));
   spi_eeprom.out = 1;
   spi_eeprom.state = GET_OPCODE;
 
-  /* enable backup RAM */
-  sram.custom = 2;
-  sram.on = 1;
+  if (size)
+    *size = sizeof(T_EEPROM_SPI);
+  return &spi_eeprom;
 }
 
 void eeprom_spi_write(unsigned char data)
@@ -208,7 +210,7 @@ void eeprom_spi_write(unsigned char data)
               if (spi_eeprom.opcode & 0x01)
               {
                 /* READ operation */
-                spi_eeprom.buffer = sram.sram[spi_eeprom.addr];
+                spi_eeprom.buffer = SRam.data[spi_eeprom.addr];
                 spi_eeprom.state = READ_BYTE;
               }
               else
@@ -264,7 +266,7 @@ void eeprom_spi_write(unsigned char data)
                       /* $C000-$FFFF (sector #3) is protected */
                       if (spi_eeprom.addr < 0xC000)
                       {
-                        sram.sram[spi_eeprom.addr] = spi_eeprom.buffer;
+                        SRam.data[spi_eeprom.addr] = spi_eeprom.buffer;
                       }
                       break;
                     }
@@ -274,7 +276,7 @@ void eeprom_spi_write(unsigned char data)
                       /* $8000-$FFFF (sectors #2 and #3) is protected */
                       if (spi_eeprom.addr < 0x8000)
                       {
-                        sram.sram[spi_eeprom.addr] = spi_eeprom.buffer;
+                        SRam.data[spi_eeprom.addr] = spi_eeprom.buffer;
                       }
                       break;
                     }
@@ -288,7 +290,7 @@ void eeprom_spi_write(unsigned char data)
                     default:
                     {
                       /* no sectors protected */
-                      sram.sram[spi_eeprom.addr] = spi_eeprom.buffer;
+                      SRam.data[spi_eeprom.addr] = spi_eeprom.buffer;
                       break;
                     }
                   }
@@ -330,7 +332,7 @@ void eeprom_spi_write(unsigned char data)
               {
                 /* read next array byte */
                 spi_eeprom.addr = (spi_eeprom.addr + 1) & SIZE_MASK;
-                spi_eeprom.buffer = sram.sram[spi_eeprom.addr];
+                spi_eeprom.buffer = SRam.data[spi_eeprom.addr];
               }
             }
           }

pico/carthw/eeprom_spi.h

@@ -40,7 +40,7 @@
 #define _EEPROM_SPI_H_
 
 /* Function prototypes */
-extern void eeprom_spi_init();
+extern void *eeprom_spi_init(int *size);
 extern void eeprom_spi_write(unsigned char data);
 extern unsigned int eeprom_spi_read(unsigned int address);
 

platform/common/common.mak

@@ -102,6 +102,7 @@ endif
 SRCS_COMMON += $(R)pico/pico/pico.c $(R)pico/pico/memory.c $(R)pico/pico/xpcm.c
 # carthw
 SRCS_COMMON += $(R)pico/carthw/carthw.c
+SRCS_COMMON += $(R)pico/carthw/eeprom_spi.c
 # SVP
 SRCS_COMMON += $(R)pico/carthw/svp/svp.c $(R)pico/carthw/svp/memory.c \
 	$(R)pico/carthw/svp/ssp16.c