[PATCH v4 2/3] hw/riscv: sifive_e: Support the watchdog timer of HiFive 1 rev b.

[Tommy Wu]

Create the AON device when we realize the sifive_e machine.
This patch only implemented the functionality of the watchdog timer,
not all the functionality of the AON device.

Signed-off-by: Tommy Wu <tommy...@sifive.com>
Reviewed-by: Frank Chang <frank.ch...@sifive.com>
---
 hw/riscv/Kconfig            |  1 +
 hw/riscv/sifive_e.c         | 13 +++++++++++--
 include/hw/riscv/sifive_e.h |  8 +++++---
 3 files changed, 17 insertions(+), 5 deletions(-)

diff --git a/hw/riscv/Kconfig b/hw/riscv/Kconfig
index 6528ebfa3a..b6a5eb4452 100644
--- a/hw/riscv/Kconfig
+++ b/hw/riscv/Kconfig
@@ -60,6 +60,7 @@ config SIFIVE_E
     select SIFIVE_PLIC
     select SIFIVE_UART
     select SIFIVE_E_PRCI
+    select SIFIVE_E_AON
     select UNIMP
 
 config SIFIVE_U
diff --git a/hw/riscv/sifive_e.c b/hw/riscv/sifive_e.c
index 04939b60c3..731ed0e11d 100644
--- a/hw/riscv/sifive_e.c
+++ b/hw/riscv/sifive_e.c
@@ -45,6 +45,7 @@
 #include "hw/intc/riscv_aclint.h"
 #include "hw/intc/sifive_plic.h"
 #include "hw/misc/sifive_e_prci.h"
+#include "hw/misc/sifive_e_aon.h"
 #include "chardev/char.h"
 #include "sysemu/sysemu.h"
 
@@ -223,8 +224,13 @@ static void sifive_e_soc_realize(DeviceState *dev, Error 
**errp)
         RISCV_ACLINT_DEFAULT_MTIMER_SIZE, 0, ms->smp.cpus,
         RISCV_ACLINT_DEFAULT_MTIMECMP, RISCV_ACLINT_DEFAULT_MTIME,
         RISCV_ACLINT_DEFAULT_TIMEBASE_FREQ, false);
-    create_unimplemented_device("riscv.sifive.e.aon",
-        memmap[SIFIVE_E_DEV_AON].base, memmap[SIFIVE_E_DEV_AON].size);
+
+    s->aon = qdev_new(TYPE_SIFIVE_E_AON);
+    if (!sysbus_realize(SYS_BUS_DEVICE(s->aon), errp)) {
+        return;
+    }
+    sysbus_mmio_map(SYS_BUS_DEVICE(s->aon), 0, memmap[SIFIVE_E_DEV_AON].base);
+
     sifive_e_prci_create(memmap[SIFIVE_E_DEV_PRCI].base);
 
     /* GPIO */
@@ -245,6 +251,9 @@ static void sifive_e_soc_realize(DeviceState *dev, Error 
**errp)
                            qdev_get_gpio_in(DEVICE(s->plic),
                                             SIFIVE_E_GPIO0_IRQ0 + i));
     }
+    sysbus_connect_irq(SYS_BUS_DEVICE(s->aon), 0,
+                       qdev_get_gpio_in(DEVICE(s->plic),
+                                        SIFIVE_E_AON_WDT_IRQ));
 
     sifive_uart_create(sys_mem, memmap[SIFIVE_E_DEV_UART0].base,
         serial_hd(0), qdev_get_gpio_in(DEVICE(s->plic), SIFIVE_E_UART0_IRQ));
diff --git a/include/hw/riscv/sifive_e.h b/include/hw/riscv/sifive_e.h
index b824a79e2d..a094b47e0b 100644
--- a/include/hw/riscv/sifive_e.h
+++ b/include/hw/riscv/sifive_e.h
@@ -35,6 +35,7 @@ typedef struct SiFiveESoCState {
     /*< public >*/
     RISCVHartArrayState cpus;
     DeviceState *plic;
+    DeviceState *aon;
     SIFIVEGPIOState gpio;
     MemoryRegion xip_mem;
     MemoryRegion mask_rom;
@@ -76,9 +77,10 @@ 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"
-- 
2.27.0