[PATCH 2/5] hw/arm/bcm2838: enable BCM2838 RNG200

[Marcelo Manzo <marcelomanzo@gmail.com>]

Wire the BCM2838 RNG200 device (added in the previous patch) into
the SoC: instantiate it in the peripherals block, map its register
region at the real BCM2711 physical address, and connect its
interrupt through both the GIC and the legacy GPU interrupt
controller path (matching how the device's own realize() wires it,
mirroring the pattern used for the older BCM2835 RNG on raspi0-3).
Also stop raspi4b from masking out the "brcm,bcm2711-rng200"
device-tree node, now that the controller it describes is actually
implemented.

Adapted from patch 16/41 of Sergey Kambalin's Raspberry Pi 4B series
(patchwork series 829638) against current QEMU master.

Signed-off-by: Marcelo Manzo <marcelomanzo@gmail.com>
---
 hw/arm/bcm2838.c                     |  4 ++++
 hw/arm/bcm2838_peripherals.c         | 17 +++++++++++++++++
 hw/arm/raspi4b.c                     |  1 -
 include/hw/arm/bcm2838_peripherals.h |  2 ++
 4 files changed, 23 insertions(+), 1 deletion(-)

diff --git a/hw/arm/bcm2838.c b/hw/arm/bcm2838.c
index f47b96c3..9d96dc11 100644
--- a/hw/arm/bcm2838.c
+++ b/hw/arm/bcm2838.c
@@ -209,6 +209,10 @@ static void bcm2838_realize(DeviceState *dev, Error **errp)
     sysbus_connect_irq(SYS_BUS_DEVICE(&ps_base->dwc2), 0,
                        qdev_get_gpio_in(gicdev, GIC_SPI_INTERRUPT_DWC2));
 
+    /* Connect RNG200 to the interrupt controller */
+    sysbus_connect_irq(SYS_BUS_DEVICE(&ps->rng200), 0,
+                       qdev_get_gpio_in(gicdev, GIC_SPI_INTERRUPT_RNG200));
+
     /* Connect DMA 0-6 to the interrupt controller */
     for (int n = GIC_SPI_INTERRUPT_DMA_0; n <= GIC_SPI_INTERRUPT_DMA_6; n++) {
         sysbus_connect_irq(SYS_BUS_DEVICE(&ps_base->dma),
diff --git a/hw/arm/bcm2838_peripherals.c b/hw/arm/bcm2838_peripherals.c
index de49f48b..7c202b00 100644
--- a/hw/arm/bcm2838_peripherals.c
+++ b/hw/arm/bcm2838_peripherals.c
@@ -40,6 +40,9 @@ static void bcm2838_peripherals_init(Object *obj)
     /* Extended Mass Media Controller 2 */
     object_initialize_child(obj, "emmc2", &s->emmc2, TYPE_SYSBUS_SDHCI);
 
+    /* Random Number Generator */
+    object_initialize_child(obj, "rng200", &s->rng200, TYPE_BCM2838_RNG200);
+
     /* PCIe Host Bridge */
     object_initialize_child(obj, "pcie-host", &s->pcie_host,
                             TYPE_BCM2838_PCIE_HOST);
@@ -82,6 +85,8 @@ static void bcm2838_peripherals_realize(DeviceState *dev, Error **errp)
     BCMSocPeripheralBaseState *s_base = BCM_SOC_PERIPHERALS_BASE(dev);
     MemoryRegion *regs_mr;
     MemoryRegion *mmio_mr;
+    MemoryRegion *rng200_mr;
+    qemu_irq rng_200_irq;
     int n;
 
     bcm_soc_peripherals_common_realize(dev, errp);
@@ -94,6 +99,18 @@ static void bcm2838_peripherals_realize(DeviceState *dev, Error **errp)
                                         BCM2838_VC_PERI_LOW_BASE,
                                         &s->peri_low_mr_alias, 1);
 
+    /* Random Number Generator */
+    if (!sysbus_realize(SYS_BUS_DEVICE(&s->rng200), errp)) {
+        return;
+    }
+
+    rng200_mr = sysbus_mmio_get_region(SYS_BUS_DEVICE(&s->rng200), 0);
+    memory_region_add_subregion(&s_base->peri_mr, RNG_OFFSET, rng200_mr);
+
+    rng_200_irq = qdev_get_gpio_in_named(DEVICE(&s_base->ic),
+                                         BCM2835_IC_GPU_IRQ, INTERRUPT_RNG);
+    sysbus_connect_irq(SYS_BUS_DEVICE(&s->rng200), 0, rng_200_irq);
+
     /* Extended Mass Media Controller 2 */
     object_property_set_uint(OBJECT(&s->emmc2), "sd-spec-version", 3,
                              &error_abort);
diff --git a/hw/arm/raspi4b.c b/hw/arm/raspi4b.c
index 79f60932..1c063a1c 100644
--- a/hw/arm/raspi4b.c
+++ b/hw/arm/raspi4b.c
@@ -64,7 +64,6 @@ static void raspi4_modify_dtb(const struct arm_boot_info *info, void *fdt)
 
     /* Temporarily disable following devices until they are implemented */
     const char *nodes_to_remove[] = {
-        "brcm,bcm2711-rng200",
         "brcm,bcm2711-thermal",
     };
 
diff --git a/include/hw/arm/bcm2838_peripherals.h b/include/hw/arm/bcm2838_peripherals.h
index 5da340f2..52eabf67 100644
--- a/include/hw/arm/bcm2838_peripherals.h
+++ b/include/hw/arm/bcm2838_peripherals.h
@@ -10,6 +10,7 @@
 #define BCM2838_PERIPHERALS_H
 
 #include "hw/arm/bcm2835_peripherals.h"
+#include "hw/misc/bcm2838_rng200.h"
 #include "hw/arm/bcm2838_pcie.h"
 #include "hw/net/bcm2838_genet.h"
 #include "hw/sd/sdhci.h"
@@ -68,6 +69,7 @@ struct BCM2838PeripheralState {
     MemoryRegion peri_low_mr_alias;
     MemoryRegion mphi_mr_alias;
 
+    BCM2838Rng200State rng200;
     SDHCIState emmc2;
     BCM2838PcieHostState pcie_host;
     BCM2838GenetState genet;
-- 
2.47.1