//
// CD handler
//
-// by cal2
+// by David Raingeard
// GCC/SDL port by Niels Wagenaar (Linux/WIN32) and Caz (BeOS)
-// Cleanups by James L. Hammons
+// Cleanups/fixes by James L. Hammons
//
+#include "m68k.h"
#include "cdrom.h"
-//#define CDROM_LOG
+
+#define CDROM_LOG // For CDROM logging, obviously
+
+/*
+BUTCH equ $DFFF00 ; base of Butch=interrupt control register, R/W
+DSCNTRL equ BUTCH+4 ; DSA control register, R/W
+DS_DATA equ BUTCH+$A ; DSA TX/RX data, R/W
+I2CNTRL equ BUTCH+$10 ; i2s bus control register, R/W
+SBCNTRL equ BUTCH+$14 ; CD subcode control register, R/W
+SUBDATA equ BUTCH+$18 ; Subcode data register A
+SUBDATB equ BUTCH+$1C ; Subcode data register B
+SB_TIME equ BUTCH+$20 ; Subcode time and compare enable (D24)
+FIFO_DATA equ BUTCH+$24 ; i2s FIFO data
+I2SDAT1 equ BUTCH+$24 ; i2s FIFO data
+I2SDAT2 equ BUTCH+$28 ; i2s FIFO data
+2C = ?
+
+;
+; Butch's hardware registers
+;
+;BUTCH equ $DFFF00 ;base of Butch=interrupt control register, R/W
+;
+; When written (Long):
+;
+; bit0 - set to enable interrupts
+; bit1 - enable CD data FIFO half full interrupt
+; bit2 - enable CD subcode frame-time interrupt (@ 2x spped = 7ms.)
+; bit3 - enable pre-set subcode time-match found interrupt
+; bit4 - CD module command transmit buffer empty interrupt
+; bit5 - CD module command receive buffer full
+; bit6 - CIRC failure interrupt
+;
+; bit7-31 reserved, set to 0
+;
+; When read (Long):
+;
+; bit0-8 reserved
+;
+; bit9 - CD data FIFO half-full flag pending
+; bit10 - Frame pending
+; bit11 - Subcode data pending
+; bit12 - Command to CD drive pending (trans buffer empty if 1)
+; bit13 - Response from CD drive pending (rec buffer full if 1)
+; bit14 - CD uncorrectable data error pending
+;
+; Offsets from BUTCH
+;
+O_DSCNTRL equ 4 ; DSA control register, R/W
+O_DS_DATA equ $A ; DSA TX/RX data, R/W
+;
+O_I2CNTRL equ $10 ; i2s bus control register, R/W
+;
+; When read:
+;
+; b0 - I2S data from drive is ON if 1
+; b1 - I2S path to Jerry is ON if 1
+; b2 - reserved
+; b3 - host bus width is 16 if 1, else 32
+; b4 - FIFO state is not empty if 1
+;
+O_SBCNTRL equ $14 ; CD subcode control register, R/W
+O_SUBDATA equ $18 ; Subcode data register A
+O_SUBDATB equ $1C ; Subcode data register B
+O_SB_TIME equ $20 ; Subcode time and compare enable (D24)
+O_FIFODAT equ $24 ; i2s FIFO data
+O_I2SDAT2 equ $28 ; i2s FIFO data (old)
+*/
+char * BReg[11] = { "BUTCH", "DSCNTRL", "DS_DATA", "I2CNTRL", "SBCNTRL", "SUBDATA", "SUBDATB",
+ "SB_TIME", "FIFO_DATA", "I2SDAT1", "I2SDAT2" };
+extern char * whoName[9];
+
static uint8 cdrom_ram[0x100];
static uint16 cdrom_cmd = 0;
{
}
-void cdrom_byte_write(uint32 offset, uint8 data)
+//
+// CD-ROM memory access functions
+//
+
+uint8 CDROMReadByte(uint32 offset, uint32 who/*=UNKNOWN*/)
+{
+#ifdef CDROM_LOG
+ if ((offset & 0xFF) < 11 * 4)
+ WriteLog("[%s] ", BReg[(offset & 0xFF) / 4]);
+ WriteLog("CDROM: %s reading byte $%02X from $%08X [68K PC=$%08X]\n", whoName[who], offset, cdrom_ram[offset & 0xFF], m68k_get_reg(NULL, M68K_REG_PC));
+#endif
+ return cdrom_ram[offset & 0xFF];
+}
+
+uint16 CDROMReadWord(uint32 offset, uint32 who/*=UNKNOWN*/)
+{
+ offset &= 0xFF;
+
+ uint16 data = 0x0000;
+
+ if (offset == 0x00)
+ data = 0x0000;
+ else if (offset == 0x02)
+ data = 0x2000;
+ else if (offset == 0x0A)
+ {
+ if (cdrom_cmd == 0x7001)
+ data = cdrom_cmd;
+ else
+ data = 0x0400;
+ }
+ else
+ data = (cdrom_ram[offset+0] << 8) | cdrom_ram[offset+1];
+
+//Returning $00000008 seems to cause it to use the starfield. Dunno why.
+//Temp, for testing...
+//Very interesting...! Seems to control sumthin' or other...
+/*if (offset == 0x2C || offset == 0x2E)
+ data = 0xFFFF;//*/
+if (offset == 0x2C)
+ data = 0x0000;
+if (offset == 0x2E)
+ data = 0x0008;//*/ // $0000 000F ($B) works, but not $0000 00001... or $7
+
+#ifdef CDROM_LOG
+ if ((offset & 0xFF) < 11 * 4)
+ WriteLog("[%s] ", BReg[(offset & 0xFF) / 4]);
+ WriteLog("CDROM: %s reading word $%04X from $%08X [68K PC=$%08X]\n", whoName[who], data, offset, m68k_get_reg(NULL, M68K_REG_PC));
+#endif
+ return data;
+}
+
+void CDROMWriteByte(uint32 offset, uint8 data, uint32 who/*=UNKNOWN*/)
{
offset &= 0xFF;
cdrom_ram[offset] = data;
#ifdef CDROM_LOG
- fprintf(log_get(),"cdrom: writing byte 0x%.2x at 0x%.8x\n",data,offset);
+ if ((offset & 0xFF) < 11 * 4)
+ WriteLog("[%s] ", BReg[(offset & 0xFF) / 4]);
+ WriteLog("CDROM: %s writing byte $%02X at $%08X [68K PC=$%08X]\n", whoName[who], data, offset, m68k_get_reg(NULL, M68K_REG_PC));
#endif
}
-void cdrom_word_write(uint32 offset, uint16 data)
+void CDROMWriteWord(uint32 offset, uint16 data, uint32 who/*=UNKNOWN*/)
{
offset &= 0xFF;
cdrom_ram[offset+0] = (data >> 8) & 0xFF;
cdrom_cmd=data;
if ((data&0xff00)==0x1500)
{
- fprintf(log_get(),"cdrom: setting mode 0x%.2x\n",data&0xff);
+ WriteLog("CDROM: setting mode 0x%.2x\n",data&0xff);
return;
}
if (data==0x7001)
offset<<=8;
offset|=cdrom_ram[0x05];
- fprintf(log_get(),"cdrom: READ(0x%.8x, 0x%.4x) [68k pc=0x%.8x]\n",offset,size,s68000readPC());
+ WriteLog("CDROM: READ(0x%.8x, 0x%.4x) [68k pc=0x%.8x]\n", offset, size, m68k_get_reg(NULL, M68K_REG_PC));
return;
}
else
- fprintf(log_get(),"cdrom: unknown command 0x%.4x\n",data);
+ WriteLog("CDROM: unknown command 0x%.4x\n",data);
}
-*/
-#ifdef CDROM_LOG
- fprintf(log_get(),"cdrom: writing word 0x%.4x at 0x%.8x\n",data,offset);
-#endif
-}
-
-uint8 cdrom_byte_read(uint32 offset)
-{
+//*/
#ifdef CDROM_LOG
- fprintf(log_get(),"cdrom: reading byte from 0x%.8x\n",offset);
+ if ((offset & 0xFF) < 11 * 4)
+ WriteLog("[%s] ", BReg[(offset & 0xFF) / 4]);
+ WriteLog("CDROM: %s writing word $%04X at $%08X [68K PC=$%08X]\n", whoName[who], data, offset, m68k_get_reg(NULL, M68K_REG_PC));
#endif
- return cdrom_ram[offset & 0xFF];
-}
-
-uint16 cdrom_word_read(uint32 offset)
-{
- offset &= 0xFF;
-
- uint16 data = 0x0000;
-
- if (offset == 0x00)
- data = 0x0000;
- else if (offset == 0x02)
- data = 0x2000;
- else if (offset == 0x0A)
- {
- if (cdrom_cmd == 0x7001)
- data = cdrom_cmd;
- else
- data = 0x0400;
- }
- else
- data = (cdrom_ram[offset+0] << 8) | cdrom_ram[offset+1];
-
-#ifdef CDROM_LOG
- fprintf(log_get(),"cdrom: reading word 0x%.4x from 0x%.8x [68k pc=0x%.8x]\n",data,offset,s68000readPC());
-#endif
- return data;
}
projects / virtualjaguar / blobdiff