From 32d26ea407cadf6efbb46c972caf8594a45c4c81 Mon Sep 17 00:00:00 2001
From: Helge Deller <deller@gmx.de>
Date: Sat, 3 Feb 2024 01:04:45 +0100
Subject: [PATCH] lasi: Add reset I/O ports for LASI audio and FDC

Linux writes zeroes at bootup into the default ports for LASI audio and
LASI floppy controller to reset those devices.  Allow writing to those
registers to avoid HPMCs.

Signed-off-by: Helge Deller <deller@gmx.de>
---
 hw/misc/lasi.c         | 11 +++++++++++
 include/hw/misc/lasi.h |  2 ++
 2 files changed, 13 insertions(+)

diff --git a/hw/misc/lasi.c b/hw/misc/lasi.c
index 9cfa5bb316..970fc98b5c 100644
--- a/hw/misc/lasi.c
+++ b/hw/misc/lasi.c
@@ -36,10 +36,13 @@ static bool lasi_chip_mem_valid(void *opaque, hwaddr addr,
     case LASI_IAR:
 
     case LASI_LPT:
+    case LASI_AUDIO:
+    case LASI_AUDIO + 4:
     case LASI_UART:
     case LASI_LAN:
     case LASI_LAN + 12: /* LASI LAN MAC */
     case LASI_RTC:
+    case LASI_FDC:
 
     case LASI_PCR ... LASI_AMR:
         ret = true;
@@ -80,6 +83,7 @@ static MemTxResult lasi_chip_read_with_attrs(void *opaque, hwaddr addr,
     case LASI_UART:
     case LASI_LAN:
     case LASI_LAN + 12:
+    case LASI_FDC:
         val = 0;
         break;
     case LASI_RTC:
@@ -145,12 +149,19 @@ static MemTxResult lasi_chip_write_with_attrs(void *opaque, hwaddr addr,
     case LASI_LPT:
         /* XXX: reset parallel port */
         break;
+    case LASI_AUDIO:
+    case LASI_AUDIO + 4:
+        /* XXX: reset audio port */
+        break;
     case LASI_UART:
         /* XXX: reset serial port */
         break;
     case LASI_LAN:
         /* XXX: reset LAN card */
         break;
+    case LASI_FDC:
+        /* XXX: reset Floppy controller */
+        break;
     case LASI_RTC:
         s->rtc_ref = val - time(NULL);
         break;
diff --git a/include/hw/misc/lasi.h b/include/hw/misc/lasi.h
index 0a8c7352be..f01c0f680a 100644
--- a/include/hw/misc/lasi.h
+++ b/include/hw/misc/lasi.h
@@ -26,9 +26,11 @@ OBJECT_DECLARE_SIMPLE_TYPE(LasiState, LASI_CHIP)
 #define LASI_IAR        0x10
 
 #define LASI_LPT        0x02000
+#define LASI_AUDIO      0x04000
 #define LASI_UART       0x05000
 #define LASI_LAN        0x07000
 #define LASI_RTC        0x09000
+#define LASI_FDC        0x0A000
 
 #define LASI_PCR        0x0C000 /* LASI Power Control register */
 #define LASI_ERRLOG     0x0C004 /* LASI Error Logging register */