hw/arm/fsl-imx8mp: Add watchdog support

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Bernhard Beschow <shentey@gmail.com>
Message-id: 20250223114708.1780-13-shentey@gmail.com
[PMM: drop static const from wdog_table for GCC 7.5]
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

2 files changed, 29 insertions, 0 deletions

diff --git a/hw/arm/Kconfig b/hw/arm/Kconfig
index 28ae409..98ac93a 100644
--- a/hw/arm/Kconfig
+++ b/hw/arm/Kconfig
@@ -606,6 +606,7 @@ config FSL_IMX8MP
     select PCI_EXPRESS_FSL_IMX8M_PHY
     select SDHCI
     select UNIMP
+    select WDT_IMX2
 
 config FSL_IMX8MP_EVK
     bool
diff --git a/hw/arm/fsl-imx8mp.c b/hw/arm/fsl-imx8mp.c
index 63f07ec..762f2a5 100644
--- a/hw/arm/fsl-imx8mp.c
+++ b/hw/arm/fsl-imx8mp.c
@@ -228,6 +228,11 @@ static void fsl_imx8mp_init(Object *obj)
         object_initialize_child(obj, name, &s->spi[i], TYPE_IMX_SPI);
     }
 
+    for (i = 0; i < FSL_IMX8MP_NUM_WDTS; i++) {
+        g_autofree char *name = g_strdup_printf("wdt%d", i);
+        object_initialize_child(obj, name, &s->wdt[i], TYPE_IMX2_WDT);
+    }
+
     object_initialize_child(obj, "pcie", &s->pcie, TYPE_DESIGNWARE_PCIE_HOST);
     object_initialize_child(obj, "pcie_phy", &s->pcie_phy,
                             TYPE_FSL_IMX8M_PCIE_PHY);
@@ -491,6 +496,28 @@ static void fsl_imx8mp_realize(DeviceState *dev, Error **errp)
     sysbus_mmio_map(SYS_BUS_DEVICE(&s->snvs), 0,
                     fsl_imx8mp_memmap[FSL_IMX8MP_SNVS_HP].addr);
 
+    /* Watchdogs */
+    for (i = 0; i < FSL_IMX8MP_NUM_WDTS; i++) {
+        struct {
+            hwaddr addr;
+            unsigned int irq;
+        } wdog_table[FSL_IMX8MP_NUM_WDTS] = {
+            { fsl_imx8mp_memmap[FSL_IMX8MP_WDOG1].addr, FSL_IMX8MP_WDOG1_IRQ },
+            { fsl_imx8mp_memmap[FSL_IMX8MP_WDOG2].addr, FSL_IMX8MP_WDOG2_IRQ },
+            { fsl_imx8mp_memmap[FSL_IMX8MP_WDOG3].addr, FSL_IMX8MP_WDOG3_IRQ },
+        };
+
+        object_property_set_bool(OBJECT(&s->wdt[i]), "pretimeout-support",
+                                 true, &error_abort);
+        if (!sysbus_realize(SYS_BUS_DEVICE(&s->wdt[i]), errp)) {
+            return;
+        }
+
+        sysbus_mmio_map(SYS_BUS_DEVICE(&s->wdt[i]), 0, wdog_table[i].addr);
+        sysbus_connect_irq(SYS_BUS_DEVICE(&s->wdt[i]), 0,
+                           qdev_get_gpio_in(gicdev, wdog_table[i].irq));
+    }
+
     /* PCIe */
     if (!sysbus_realize(SYS_BUS_DEVICE(&s->pcie), errp)) {
         return;
@@ -531,6 +558,7 @@ static void fsl_imx8mp_realize(DeviceState *dev, Error **errp)
         case FSL_IMX8MP_SNVS_HP:
         case FSL_IMX8MP_UART1 ... FSL_IMX8MP_UART4:
         case FSL_IMX8MP_USDHC1 ... FSL_IMX8MP_USDHC3:
+        case FSL_IMX8MP_WDOG1 ... FSL_IMX8MP_WDOG3:
             /* device implemented and treated above */
             break;