2 files changed, 66 insertions, 3 deletions
diff --git a/include/hw/misc/sifive_e_aon.h b/include/hw/misc/sifive_e_aon.h
new file mode 100644
index 0000000..2ae1c41
--- /dev/null
+++ b/include/hw/misc/sifive_e_aon.h
@@ -0,0 +1,60 @@
+/*
+ * SiFive HiFive1 AON (Always On Domain) interface.
+ *
+ * Copyright (c) 2022 SiFive, Inc. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2 or later, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef HW_SIFIVE_AON_H
+#define HW_SIFIVE_AON_H
+
+#include "hw/sysbus.h"
+#include "qom/object.h"
+
+#define TYPE_SIFIVE_E_AON "riscv.sifive.e.aon"
+OBJECT_DECLARE_SIMPLE_TYPE(SiFiveEAONState, SIFIVE_E_AON)
+
+#define SIFIVE_E_AON_WDOGKEY (0x51F15E)
+#define SIFIVE_E_AON_WDOGFEED (0xD09F00D)
+#define SIFIVE_E_LFCLK_DEFAULT_FREQ (32768)
+
+enum {
+    SIFIVE_E_AON_WDT    = 0x0,
+    SIFIVE_E_AON_RTC    = 0x40,
+    SIFIVE_E_AON_LFROSC = 0x70,
+    SIFIVE_E_AON_BACKUP = 0x80,
+    SIFIVE_E_AON_PMU    = 0x100,
+    SIFIVE_E_AON_MAX    = 0x150
+};
+
+struct SiFiveEAONState {
+    /*< private >*/
+    SysBusDevice parent_obj;
+
+    /*< public >*/
+    MemoryRegion mmio;
+
+    /*< watchdog timer >*/
+    QEMUTimer *wdog_timer;
+    qemu_irq wdog_irq;
+    uint64_t wdog_restart_time;
+    uint64_t wdogclk_freq;
+
+    uint32_t wdogcfg;
+    uint16_t wdogcmp0;
+    uint32_t wdogcount;
+    uint8_t wdogunlock;
+};
+
+#endif
diff --git a/include/hw/riscv/sifive_e.h b/include/hw/riscv/sifive_e.h
index b824a79..31180a6 100644
--- a/include/hw/riscv/sifive_e.h
+++ b/include/hw/riscv/sifive_e.h
@@ -22,6 +22,7 @@
 #include "hw/riscv/riscv_hart.h"
 #include "hw/riscv/sifive_cpu.h"
 #include "hw/gpio/sifive_gpio.h"
+#include "hw/misc/sifive_e_aon.h"
 #include "hw/boards.h"
 
 #define TYPE_RISCV_E_SOC "riscv.sifive.e.soc"
@@ -35,6 +36,7 @@ typedef struct SiFiveESoCState {
     /*< public >*/
     RISCVHartArrayState cpus;
     DeviceState *plic;
+    SiFiveEAONState aon;
     SIFIVEGPIOState gpio;
     MemoryRegion xip_mem;
     MemoryRegion mask_rom;
@@ -76,9 +78,10 @@ enum {
 };
 
 enum {
-    SIFIVE_E_UART0_IRQ  = 3,
-    SIFIVE_E_UART1_IRQ  = 4,
-    SIFIVE_E_GPIO0_IRQ0 = 8
+    SIFIVE_E_AON_WDT_IRQ  = 1,
+    SIFIVE_E_UART0_IRQ    = 3,
+    SIFIVE_E_UART1_IRQ    = 4,
+    SIFIVE_E_GPIO0_IRQ0   = 8
 };
 
 #define SIFIVE_E_PLIC_HART_CONFIG "M"