hw/misc: Implement mailbox properties for customer OTP and device specific private keys

Four mailbox properties are implemented as follows:
1. Customer OTP: GET_CUSTOMER_OTP and SET_CUSTOMER_OTP
2. Device-specific private key: GET_PRIVATE_KEY and
SET_PRIVATE_KEY.

The customer OTP is located in the rows 36-43. The device-specific private key
is located in the rows 56-63.

The customer OTP can be locked with the magic numbers 0xffffffff 0xaffe0000
when running the SET_CUSTOMER_OTP mailbox command. Bit 6 of row 32 indicates
this lock, which is undocumented. The lock also applies to the device-specific
private key.

Signed-off-by: Rayhan Faizel <rayhan.faizel@gmail.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

1 files changed, 2 insertions, 0 deletions

diff --git a/hw/arm/bcm2835_peripherals.c b/hw/arm/bcm2835_peripherals.c
index 7d735bb..ac153a9 100644
--- a/hw/arm/bcm2835_peripherals.c
+++ b/hw/arm/bcm2835_peripherals.c
@@ -132,6 +132,8 @@ static void raspi_peripherals_base_init(Object *obj)
                                    OBJECT(&s->fb));
     object_property_add_const_link(OBJECT(&s->property), "dma-mr",
                                    OBJECT(&s->gpu_bus_mr));
+    object_property_add_const_link(OBJECT(&s->property), "otp",
+                                   OBJECT(&s->otp));
 
     /* Extended Mass Media Controller */
     object_initialize_child(obj, "sdhci", &s->sdhci, TYPE_SYSBUS_SDHCI);