commit 4f2f66a280534c249ad8624e1492610355cfc60c
author Antonio Nino Diaz <antonio.ninodiaz@arm.com> Thu Jul 12 13:38:53 2018 +0100
committer Antonio Nino Diaz <antonio.ninodiaz@arm.com> Sat Jul 14 02:15:55 2018 +0100
tree eb63a1a6ca458b7f4787767c0f73bcf9445456c5
parent 42ba8f747b154fbc349bfbccd47b5fdd6b4f6d81

rpi3: Detect board revision

Implement VideoCore mailbox interface driver and use it to get the board
revision identifier.

For now it is only used to print the model for debug purposes.

This wiki contains the documentation of the mailbox interface:

https://github.com/raspberrypi/firmware/wiki

Change-Id: I11943b99b52cc1409f4a195ebe58eb44ae5b1d6c
Signed-off-by: Antonio Nino Diaz <antonio.ninodiaz@arm.com>

plat/rpi3/rpi3_hw.h

diff --git a/plat/rpi3/rpi3_hw.h b/plat/rpi3/rpi3_hw.h
index f411acb..a83a0ad 100644
--- a/plat/rpi3/rpi3_hw.h
+++ b/plat/rpi3/rpi3_hw.h
@@ -17,6 +17,27 @@
 #define RPI3_IO_SIZE			ULL(0x01000000)
 
 /*
+ * ARM <-> VideoCore mailboxes
+ */
+#define RPI3_MBOX_OFFSET		ULL(0x0000B880)
+#define RPI3_MBOX_BASE			(RPI3_IO_BASE + RPI3_MBOX_OFFSET)
+/* VideoCore -> ARM */
+#define RPI3_MBOX0_READ_OFFSET		ULL(0x00000000)
+#define RPI3_MBOX0_PEEK_OFFSET		ULL(0x00000010)
+#define RPI3_MBOX0_SENDER_OFFSET	ULL(0x00000014)
+#define RPI3_MBOX0_STATUS_OFFSET	ULL(0x00000018)
+#define RPI3_MBOX0_CONFIG_OFFSET	ULL(0x0000001C)
+/* ARM -> VideoCore */
+#define RPI3_MBOX1_WRITE_OFFSET		ULL(0x00000020)
+#define RPI3_MBOX1_PEEK_OFFSET		ULL(0x00000030)
+#define RPI3_MBOX1_SENDER_OFFSET	ULL(0x00000034)
+#define RPI3_MBOX1_STATUS_OFFSET	ULL(0x00000038)
+#define RPI3_MBOX1_CONFIG_OFFSET	ULL(0x0000003C)
+/* Mailbox status constants */
+#define RPI3_MBOX_STATUS_FULL_MASK	U(0x80000000) /* Set if full */
+#define RPI3_MBOX_STATUS_EMPTY_MASK	U(0x40000000) /* Set if empty */
+
+/*
  * Power management, reset controller, watchdog.
  */
 #define RPI3_IO_PM_OFFSET		ULL(0x00100000)