[Qemu-devel] [PATCH V2] bcm2835_property: implement "get board revision" query

[Stephen Warren <swarren@wwwdotorg.org>]

Return a valid value from the BCM2835 property mailbox query "get board
revision". This query is used by U-Boot. Implementing it fixes the first
obvious difference between qemu and real HW.

The value returned is currently hard-coded to match the RPi2 I own. Other
values are legal, e.g. different board manufacturer field values are
likely to exist in the wild.

Cc: Andrew Baumann <Andrew.Baumann@microsoft.com>
Signed-off-by: Stephen Warren <swarren@wwwdotorg.org>
---
V2: Set the property in raspi.c, and pass it through to the property mbox
code via property aliases.

 hw/arm/bcm2835_peripherals.c       | 2 ++
 hw/arm/bcm2836.c                   | 2 ++
 hw/arm/raspi.c                     | 2 ++
 hw/misc/bcm2835_property.c         | 4 ++--
 include/hw/misc/bcm2835_property.h | 1 +
 5 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/hw/arm/bcm2835_peripherals.c b/hw/arm/bcm2835_peripherals.c
index 18b72ecb696c..e4fb48b8035c 100644
--- a/hw/arm/bcm2835_peripherals.c
+++ b/hw/arm/bcm2835_peripherals.c
@@ -58,6 +58,8 @@ static void bcm2835_peripherals_init(Object *obj)
     /* Property channel */
     object_initialize(&s->property, sizeof(s->property), TYPE_BCM2835_PROPERTY);
     object_property_add_child(obj, "property", OBJECT(&s->property), NULL);
+    object_property_add_alias(obj, "board-rev", OBJECT(&s->property),
+                              "board-rev", &error_abort);
     qdev_set_parent_bus(DEVICE(&s->property), sysbus_get_default());
 
     object_property_add_const_link(OBJECT(&s->property), "dma-mr",
diff --git a/hw/arm/bcm2836.c b/hw/arm/bcm2836.c
index 69c7438317c4..8a4d13c7d973 100644
--- a/hw/arm/bcm2836.c
+++ b/hw/arm/bcm2836.c
@@ -39,6 +39,8 @@ static void bcm2836_init(Object *obj)
                       TYPE_BCM2835_PERIPHERALS);
     object_property_add_child(obj, "peripherals", OBJECT(&s->peripherals),
                               &error_abort);
+    object_property_add_alias(obj, "board-rev", OBJECT(&s->peripherals),
+                              "board-rev", &error_abort);
     qdev_set_parent_bus(DEVICE(&s->peripherals), sysbus_get_default());
 }
 
diff --git a/hw/arm/raspi.c b/hw/arm/raspi.c
index 0c9427c40ec4..7d3d21ab3244 100644
--- a/hw/arm/raspi.c
+++ b/hw/arm/raspi.c
@@ -128,6 +128,8 @@ static void raspi2_init(MachineState *machine)
                                    &error_abort);
     object_property_set_int(OBJECT(&s->soc), smp_cpus, "enabled-cpus",
                             &error_abort);
+    object_property_set_int(OBJECT(&s->soc), 0xa21041, "board-rev",
+                            &error_abort);
     object_property_set_bool(OBJECT(&s->soc), true, "realized", &error_abort);
 
     setup_boot(machine, 2, machine->ram_size);
diff --git a/hw/misc/bcm2835_property.c b/hw/misc/bcm2835_property.c
index e42b43e72d56..45bd6c18ce90 100644
--- a/hw/misc/bcm2835_property.c
+++ b/hw/misc/bcm2835_property.c
@@ -43,8 +43,7 @@ static void bcm2835_property_mbox_push(BCM2835PropertyState *s, uint32_t value)
             resplen = 4;
             break;
         case 0x00010002: /* Get board revision */
-            qemu_log_mask(LOG_UNIMP,
-                          "bcm2835_property: %x get board revision NYI\n", tag);
+            stl_phys(&s->dma_as, value + 12, s->board_rev);
             resplen = 4;
             break;
         case 0x00010003: /* Get board MAC address */
@@ -258,6 +257,7 @@ static void bcm2835_property_realize(DeviceState *dev, Error **errp)
 }
 
 static Property bcm2835_property_props[] = {
+    DEFINE_PROP_UINT32("board-rev", BCM2835PropertyState, board_rev, 0),
     DEFINE_PROP_UINT32("ram-size", BCM2835PropertyState, ram_size, 0),
     DEFINE_PROP_END_OF_LIST()
 };
diff --git a/include/hw/misc/bcm2835_property.h b/include/hw/misc/bcm2835_property.h
index fcf5f3decafc..df889eaa08b5 100644
--- a/include/hw/misc/bcm2835_property.h
+++ b/include/hw/misc/bcm2835_property.h
@@ -23,6 +23,7 @@ typedef struct {
     MemoryRegion iomem;
     qemu_irq mbox_irq;
     MACAddr macaddr;
+    uint32_t board_rev;
     uint32_t ram_size;
     uint32_t addr;
     bool pending;
-- 
1.9.1