cdrom: rewrite lid code

based on tests on real hardware

diff --git a/libpcsxcore/cdrom.c b/libpcsxcore/cdrom.c
index bcf83e7..95e1f05 100644 (file)
--- a/libpcsxcore/cdrom.c
+++ b/libpcsxcore/cdrom.c
@@ -130,6 +130,13 @@ unsigned char Test23[] = { 0x43, 0x58, 0x44, 0x32, 0x39 ,0x34, 0x30, 0x51 };
 // so (PSXCLK / 75) = cdr read time (linuzappz)
 #define cdReadTime (PSXCLK / 75)
 
+enum drive_state {
+       DRIVESTATE_STANDBY = 0,
+       DRIVESTATE_LID_OPEN,
+       DRIVESTATE_RESCAN_CD,
+       DRIVESTATE_PREPARE_CD,
+};
+
 // for cdr.Seeked
 enum seeked_state {
        SEEK_PENDING = 0,
@@ -218,166 +225,76 @@ static void setIrq(void)
                psxHu32ref(0x1070) |= SWAP32((u32)0x4);
 }
 
+// timing used in this function was taken from tests on real hardware
+// (yes it's slow, but you probably don't want to modify it)
 void cdrLidSeekInterrupt()
 {
-       // turn back on checking
-       if( cdr.LidCheck == 0x10 )
-       {
-               cdr.LidCheck = 0;
-       }
-
-       // official lid close
-       else if( cdr.LidCheck == 0x30 )
-       {
-               // GS CDX 3.3: $13
-               cdr.StatP |= STATUS_ROTATING;
-
-
-               // GS CDX 3.3 - ~50 getlocp tries
-               CDRLID_INT( cdReadTime * 3 );
-               cdr.LidCheck = 0x40;
-       }
-
-       // turn off ready
-       else if( cdr.LidCheck == 0x40 )
-       {
-               // GS CDX 3.3: $01
-               cdr.StatP &= ~STATUS_SHELLOPEN;
-               cdr.StatP &= ~STATUS_ROTATING;
-
-
-               // GS CDX 3.3 - ~50 getlocp tries
-               CDRLID_INT( cdReadTime * 3 );
-               cdr.LidCheck = 0x50;
-       }
-
-       // now seek
-       else if( cdr.LidCheck == 0x50 )
-       {
-               // GameShark Lite: Start seeking ($42)
-               cdr.StatP |= STATUS_SEEK;
-               cdr.StatP |= STATUS_ROTATING;
-               cdr.StatP &= ~STATUS_ERROR;
-
-
-               CDRLID_INT( cdReadTime * 3 );
-               cdr.LidCheck = 0x60;
-       }
-
-       // done = cd ready
-       else if( cdr.LidCheck == 0x60 )
-       {
-               // GameShark Lite: Seek detection done ($02)
+       switch (cdr.DriveState) {
+       default:
+       case DRIVESTATE_STANDBY:
                cdr.StatP &= ~STATUS_SEEK;
 
-               cdr.LidCheck = 0;
-       }
-}
-
-static void Check_Shell( int Irq )
-{
-       // check case open/close
-       if (cdr.LidCheck > 0)
-       {
-               CDR_LOG( "LidCheck\n" );
+               if (CDR_getStatus(&stat) == -1)
+                       return;
 
-               // $20 = check lid state
-               if( cdr.LidCheck == 0x20 )
+               if (stat.Status & STATUS_SHELLOPEN)
                {
-                       u32 i;
-
-                       i = stat.Status;
-                       if (CDR_getStatus(&stat) != -1)
-                       {
-                               // BIOS hangs + BIOS error messages
-                               //if (stat.Type == 0xff)
-                                       //cdr.Stat = DiskError;
-
-                               // case now open
-                               if (stat.Status & STATUS_SHELLOPEN)
-                               {
-                                       // Vib Ribbon: pre-CD swap
-                                       StopCdda();
-                                       StopReading();
-
-
-                                       // GameShark Lite: Death if DiskError happens
-                                       //
-                                       // Vib Ribbon: Needs DiskError for CD swap
-
-                                       //if (Irq != CdlNop)
-                                       {
-                                               cdr.Stat = DiskError;
-
-                                               cdr.StatP |= STATUS_ERROR;
-                                               cdr.Result[0] |= STATUS_ERROR;
-                                       }
-
-                                       // GameShark Lite: Wants -exactly- $10
-                                       cdr.StatP |= STATUS_SHELLOPEN;
-                                       cdr.StatP &= ~STATUS_ROTATING;
-
-
-                                       CDRLID_INT( cdReadTime * 3 );
-                                       cdr.LidCheck = 0x10;
-
-
-                                       // GS CDX 3.3 = $11
-                               }
-
-                               // case just closed
-                               else if ( i & STATUS_SHELLOPEN )
-                               {
-                                       cdr.StatP |= STATUS_ROTATING;
-
-                                       CheckCdrom();
-
-
-                                       if( cdr.Stat == NoIntr )
-                                               cdr.Stat = Acknowledge;
-
-                                       setIrq();
+                       StopCdda();
+                       cdr.DriveState = DRIVESTATE_LID_OPEN;
+                       CDRLID_INT(0x800);
+               }
+               break;
 
-                                       // begin close-seek-ready cycle
-                                       CDRLID_INT( cdReadTime * 3 );
-                                       cdr.LidCheck = 0x30;
+       case DRIVESTATE_LID_OPEN:
+               if (CDR_getStatus(&stat) == -1)
+                       stat.Status &= ~STATUS_SHELLOPEN;
 
+               // 02, 12, 10
+               if (!(cdr.StatP & STATUS_SHELLOPEN)) {
+                       StopReading();
+                       cdr.StatP |= STATUS_SHELLOPEN;
 
-                                       // GameShark Lite: Wants -exactly- $42, then $02
-                                       // GS CDX 3.3: Wants $11/$80, $13/$80, $01/$00
-                               }
+                       // could generate error irq here, but real hardware
+                       // only sometimes does that
+                       // (not done when lots of commands are sent?)
 
-                               // case still closed - wait for recheck
-                               else
-                               {
-                                       CDRLID_INT( cdReadTime * 3 );
-                                       cdr.LidCheck = 0x10;
-                               }
-                       }
+                       CDRLID_INT(cdReadTime * 30);
+                       break;
                }
+               else if (cdr.StatP & STATUS_ROTATING) {
+                       cdr.StatP &= ~STATUS_ROTATING;
+               }
+               else if (!(stat.Status & STATUS_SHELLOPEN)) {
+                       // closed now
+                       CheckCdrom();
 
+                       // cdr.StatP STATUS_SHELLOPEN is "sticky"
+                       // and is only cleared by CdlNop
 
-               // GS CDX: clear all values but #1,#2
-               if( (cdr.LidCheck >= 0x30) || (cdr.StatP & STATUS_SHELLOPEN) )
-               {
-                       SetResultSize(16);
-                       memset( cdr.Result, 0, 16 );
-
-                       cdr.Result[0] = cdr.StatP;
+                       cdr.DriveState = DRIVESTATE_RESCAN_CD;
+                       CDRLID_INT(cdReadTime * 105);
+                       break;
+               }
 
+               // recheck for close
+               CDRLID_INT(cdReadTime * 3);
+               break;
 
-                       // GS CDX: special return value
-                       if( cdr.StatP & STATUS_SHELLOPEN )
-                       {
-                               cdr.Result[1] = 0x80;
-                       }
+       case DRIVESTATE_RESCAN_CD:
+               cdr.StatP |= STATUS_ROTATING;
+               cdr.DriveState = DRIVESTATE_PREPARE_CD;
 
+               // this is very long on real hardware, over 6 seconds
+               // make it a bit faster here...
+               CDRLID_INT(cdReadTime * 150);
+               break;
 
-                       if( cdr.Stat == NoIntr )
-                               cdr.Stat = Acknowledge;
+       case DRIVESTATE_PREPARE_CD:
+               cdr.StatP |= STATUS_SEEK;
 
-                       setIrq();
-               }
+               cdr.DriveState = DRIVESTATE_STANDBY;
+               CDRLID_INT(cdReadTime * 26);
+               break;
        }
 }
 
@@ -626,7 +543,8 @@ void cdrInterrupt() {
                        cdr.Result[0] = cdr.StatP;
                        cdr.Stat = Acknowledge;
 
-                       if (cdr.LidCheck == 0) cdr.LidCheck = 0x20;
+                       if (cdr.DriveState != DRIVESTATE_LID_OPEN)
+                               cdr.StatP &= ~STATUS_SHELLOPEN;
                        break;
 
                case CdlSetloc:
@@ -747,8 +665,6 @@ void cdrInterrupt() {
                        cdr.Result[0] = cdr.StatP;
                        cdr.Stat = Complete;
 //                     cdr.Stat = Acknowledge;
-
-                       if (cdr.LidCheck == 0) cdr.LidCheck = 0x20;
                        break;
 
                case CdlPause:
@@ -1046,7 +962,18 @@ void cdrInterrupt() {
                        break;
        }
 
-       Check_Shell( Irq );
+       if (Irq != CdlNop) {
+               switch (cdr.DriveState) {
+               case DRIVESTATE_LID_OPEN:
+               case DRIVESTATE_RESCAN_CD:
+               case DRIVESTATE_PREPARE_CD:
+                       SetResultSize(2);
+                       cdr.Result[0] = cdr.StatP | STATUS_ERROR;
+                       cdr.Result[1] = 0x80;
+                       cdr.Stat = DiskError;
+                       break;
+               }
+       }
 
        cdr.ParamC = 0;
 
@@ -1196,8 +1123,6 @@ void cdrReadInterrupt() {
 
        // update for CdlGetlocP
        ReadTrack(cdr.SetSector);
-
-       Check_Shell(0);
 }
 
 /*
@@ -1628,6 +1553,7 @@ void cdrReset() {
        cdr.Channel = 1;
        cdr.Reg2 = 0x1f;
        cdr.Stat = NoIntr;
+       cdr.DriveState = DRIVESTATE_STANDBY;
        pTransfer = cdr.Transfer;
 
        // BIOS player - default values
@@ -1685,17 +1611,7 @@ int cdrFreeze(void *f, int Mode) {
 }
 
 void LidInterrupt() {
-       cdr.LidCheck = 0x20; // start checker
-
        getCdInfo();
-       
        StopCdda();
-       CDRLID_INT( cdReadTime * 3 );
-
-       // generate interrupt if none active - open or close
-       if (cdr.Irq == 0 || cdr.Irq == 0xff) {
-               cdr.Ctrl |= 0x80;
-               cdr.Stat = NoIntr;
-               AddIrqQueue(CdlNop, 0x800);
-       }
+       cdrLidSeekInterrupt();
 }

diff --git a/libpcsxcore/cdrom.h b/libpcsxcore/cdrom.h
index fc1df46..c2c5464 100644 (file)
--- a/libpcsxcore/cdrom.h
+++ b/libpcsxcore/cdrom.h
@@ -97,7 +97,7 @@ typedef struct {
 
        u8 Seeked;
 
-       u8 LidCheck;
+       u8 DriveState;
        u8 FastForward;
        u8 FastBackward;
        u8 pad;