raspi: add BCM2835 SOC MPHI emulation

Add BCM2835 SOC MPHI (Message-based Parallel Host Interface)
emulation. It is very basic, only providing the FIQ interrupt
needed to allow the dwc-otg USB host controller driver in the
Raspbian kernel to function.

Signed-off-by: Paul Zimmerman <pauldzim@gmail.com>
Acked-by: Philippe Mathieu-Daude <f4bug@amsat.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 20200520235349.21215-2-pauldzim@gmail.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

1 files changed, 17 insertions, 0 deletions

diff --git a/hw/arm/bcm2835_peripherals.c b/hw/arm/bcm2835_peripherals.c
index f1bcc14f55..b3e0495040 100644
--- a/hw/arm/bcm2835_peripherals.c
+++ b/hw/arm/bcm2835_peripherals.c
@@ -125,6 +125,10 @@ static void bcm2835_peripherals_init(Object *obj)
                                    OBJECT(&s->sdhci.sdbus));
     object_property_add_const_link(OBJECT(&s->gpio), "sdbus-sdhost",
                                    OBJECT(&s->sdhost.sdbus));
+
+    /* Mphi */
+    sysbus_init_child_obj(obj, "mphi", &s->mphi, sizeof(s->mphi),
+                          TYPE_BCM2835_MPHI);
 }
 
 static void bcm2835_peripherals_realize(DeviceState *dev, Error **errp)
@@ -360,6 +364,19 @@ static void bcm2835_peripherals_realize(DeviceState *dev, Error **errp)
 
     object_property_add_alias(OBJECT(s), "sd-bus", OBJECT(&s->gpio), "sd-bus");
 
+    /* Mphi */
+    object_property_set_bool(OBJECT(&s->mphi), true, "realized", &err);
+    if (err) {
+        error_propagate(errp, err);
+        return;
+    }
+
+    memory_region_add_subregion(&s->peri_mr, MPHI_OFFSET,
+                sysbus_mmio_get_region(SYS_BUS_DEVICE(&s->mphi), 0));
+    sysbus_connect_irq(SYS_BUS_DEVICE(&s->mphi), 0,
+        qdev_get_gpio_in_named(DEVICE(&s->ic), BCM2835_IC_GPU_IRQ,
+                               INTERRUPT_HOSTPORT));
+
     create_unimp(s, &s->armtmr, "bcm2835-sp804", ARMCTRL_TIMER0_1_OFFSET, 0x40);
     create_unimp(s, &s->cprman, "bcm2835-cprman", CPRMAN_OFFSET, 0x1000);
     create_unimp(s, &s->a2w, "bcm2835-a2w", A2W_OFFSET, 0x1000);