# HG changeset patch
# User nkeynes
# Date 1166521895 0
# Node ID 4c2b7291d3b0daa4a7969cae1d67790beb39c0e8
# Parent  df1671d533bff8284277e315fbeba0fd8586c9db
First cut of port 576890 (sysreset) and ide enable/disable

--- a/src/asic.c	Sat Dec 16 12:37:44 2006 +0000
+++ b/src/asic.c	Tue Dec 19 09:51:35 2006 +0000
@@ -1,5 +1,5 @@
 /**
- * $Id: asic.c,v 1.20 2006-12-15 10:18:39 nkeynes Exp $
+ * $Id: asic.c,v 1.21 2006-12-19 09:51:35 nkeynes Exp $
  *
  * Support for the miscellaneous ASIC functions (Primarily event multiplexing,
  * and DMA). 
@@ -213,6 +213,13 @@
 	MMIO_WRITE( ASIC, reg, MMIO_READ(ASIC, reg)&~val );
 	asic_check_cleared_events();
 	break;
+    case SYSRESET:
+	if( val == 0x7611 ) {
+	    dreamcast_reset();
+	} else {
+	    WARN( "Unknown value %08X written to SYSRESET port", val );
+	}
+	break;
     case MAPLE_STATE:
 	MMIO_WRITE( ASIC, reg, val );
 	if( val & 1 ) {
@@ -279,6 +286,10 @@
 
 MMIO_REGION_WRITE_FN( EXTDMA, reg, val )
 {
+    if( !idereg.interface_enabled && IS_IDE_REGISTER(reg) ) {
+	return; /* disabled */
+    }
+
     switch( reg ) {
     case IDEALTSTATUS: /* Device control */
 	ide_write_control( val );
@@ -321,6 +332,15 @@
 	MMIO_WRITE( EXTDMA, reg, val );
 	asic_ide_dma_transfer( );
 	break;
+    case IDEACTIVATE:
+	if( val == 0x001FFFFF ) {
+	    idereg.interface_enabled = TRUE;
+	    /* Conventional wisdom says that this is necessary but not
+	     * sufficient to enable the IDE interface.
+	     */
+	} else if( val == 0x000042FE ) {
+	    idereg.interface_enabled = FALSE;
+	}
     default:
             MMIO_WRITE( EXTDMA, reg, val );
     }
@@ -329,6 +349,10 @@
 MMIO_REGION_READ_FN( EXTDMA, reg )
 {
     uint32_t val;
+    if( !idereg.interface_enabled && IS_IDE_REGISTER(reg) ) {
+	return 0xFFFFFFFF; /* disabled */
+    }
+
     switch( reg ) {
     case IDEALTSTATUS: 
 	val = idereg.status;
--- a/src/asic.h	Sat Dec 16 12:37:44 2006 +0000
+++ b/src/asic.h	Tue Dec 19 09:51:35 2006 +0000
@@ -1,5 +1,5 @@
 /**
- * $Id: asic.h,v 1.13 2006-08-02 04:06:42 nkeynes Exp $
+ * $Id: asic.h,v 1.14 2006-12-19 09:51:35 nkeynes Exp $
  *
  * Support for the miscellaneous ASIC functions (Primarily event multiplexing,
  * and DMA). Includes MMIO definitions for the 5f6000 and 5f7000 regions, 
@@ -41,6 +41,7 @@
     LONG_PORT( 0x884, PVRDMARGN, PORT_MRW, 0, "PVR DMA Dest region" )
     LONG_PORT( 0x888, ASICUNKA, PORT_MRW, 0, "ASIC <unknownA>" )
     LONG_PORT( 0x88C, G2STATUS, PORT_MR|PORT_NOTRACE, 0, "G2 Bus status" )
+    LONG_PORT( 0x890, SYSRESET, PORT_W, 0, "System reset port" )
     LONG_PORT( 0x89C, ASICUNKB, PORT_MRW, 0xB, "Unknown, always 0xB?" )
     LONG_PORT( 0x8A0, ASICUNKC, PORT_MRW, 0, "ASIC <unknownC>" )
     LONG_PORT( 0x8A4, ASICUNKD, PORT_MRW, 0, "ASIC <unknownD>" )
@@ -198,6 +199,8 @@
 #define EVENT_PVR_MATRIX_ALLOC_FAIL 67
 #define EVENT_PVR_BAD_INPUT 68
 
+#define IS_IDE_REGISTER(x) ( (x) <= IDEDMACTL2 )
+
 /**
  * Raise an ASIC event 
  */