[PATCH v2 13/21] ARM: rpi: add Raspberry Pi 3 64-bit build support

[Ahmad Fatoum]

Have the subarch select the needed symbols to display a 32-bit/64-bit
menu and hide the boards that aren't capable of 64-bit when
CONFIG_64BIT=y. Building for 64-bit throws some warning about mismatched
type sizes, so fix those as well.

Signed-off-by: Ahmad Fatoum <a.fatoum at pengutronix.de>
---
 arch/arm/Kconfig                              |  2 ++
 arch/arm/mach-bcm283x/Kconfig                 | 21 +++++++++++++++----
 arch/arm/mach-bcm283x/include/mach/platform.h |  4 ++--
 arch/arm/mach-bcm283x/mbox.c                  |  2 +-
 images/Makefile.bcm283x                       |  6 ++++++
 5 files changed, 28 insertions(+), 7 deletions(-)

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 03a7e4b6600c..59fce0c601b4 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -60,6 +60,8 @@ config ARCH_BCM283X
 	select OFTREE
 	select OFDEVICE
 	select HAVE_PBL_MULTI_IMAGES
+	select CPU_SUPPORTS_32BIT_KERNEL
+	select CPU_SUPPORTS_64BIT_KERNEL
 
 config ARCH_CLPS711X
 	bool "Cirrus Logic EP711x/EP721x/EP731x"
diff --git a/arch/arm/mach-bcm283x/Kconfig b/arch/arm/mach-bcm283x/Kconfig
index 5be236a68419..af34d1c973e1 100644
--- a/arch/arm/mach-bcm283x/Kconfig
+++ b/arch/arm/mach-bcm283x/Kconfig
@@ -10,29 +10,42 @@ config MACH_RPI_COMMON
 	bool
 	select ARM_USE_COMPRESSED_DTB
 
+config MACH_RPI_AARCH_32_64
+	select MACH_RPI_COMMON
+	select CPU_V7 if 32BIT
+	select ARM_SECURE_MONITOR if 32BIT
+	select CPU_V8 if 64BIT
+	select BOARD_ARM_GENERIC_DT if 64BIT
+	bool
+	help
+	  Select this from CPUs that support both AArch32 and AArch64
+	  execution modes. barebox can be compiled for only one of
+	  these states, depending on the value of
+	  CONFIG_32BIT/CONFIG_64BIT.
+
 menu "select Broadcom BCM283X boards to be built"
 
 config MACH_RPI
 	bool "RaspberryPi (BCM2835/ARM1176JZF-S)"
+	depends on 32BIT
 	select CPU_V6
 	select MACH_RPI_COMMON
 
 config MACH_RPI2
 	bool "RaspberryPi 2 (BCM2836/CORTEX-A7)"
+	depends on 32BIT
 	select CPU_V7
 	select MACH_RPI_COMMON
 
 config MACH_RPI3
 	bool "RaspberryPi 3 (BCM2837/CORTEX-A53)"
-	select CPU_V7
+	select MACH_RPI_AARCH_32_64
 	select MACH_RPI_COMMON
-	select ARM_SECURE_MONITOR
 
 config MACH_RPI_CM3
 	bool "RaspberryPi Compute Module 3 (BCM2837/CORTEX-A53)"
-	select CPU_V7
+	select MACH_RPI_AARCH_32_64
 	select MACH_RPI_COMMON
-	select ARM_SECURE_MONITOR
 
 endmenu
 
diff --git a/arch/arm/mach-bcm283x/include/mach/platform.h b/arch/arm/mach-bcm283x/include/mach/platform.h
index 310f2463f2e5..6917e1f345d7 100644
--- a/arch/arm/mach-bcm283x/include/mach/platform.h
+++ b/arch/arm/mach-bcm283x/include/mach/platform.h
@@ -31,9 +31,9 @@
 #define BCM2835_CACHELINE_SIZE	64
 
 #define BCM2835_PL011_BASE 0x20201000
-#define BCM2836_PL011_BASE 0x3f201000
+#define BCM2836_PL011_BASE 0x3f201000UL
 #define BCM2835_MINIUART_BASE 0x20215040
-#define BCM2836_MINIUART_BASE 0x3f215040
+#define BCM2836_MINIUART_BASE 0x3f215040UL
 
 #endif
 
diff --git a/arch/arm/mach-bcm283x/mbox.c b/arch/arm/mach-bcm283x/mbox.c
index b77065ab305f..4959a1a652ec 100644
--- a/arch/arm/mach-bcm283x/mbox.c
+++ b/arch/arm/mach-bcm283x/mbox.c
@@ -151,7 +151,7 @@ int bcm2835_mbox_call_prop(u32 chan, struct bcm2835_mbox_hdr *buffer)
 	ret = bcm2835_mbox_call_raw(chan, buffer, &rbuffer);
 	if (ret)
 		return ret;
-	if (rbuffer != (u32)buffer) {
+	if (rbuffer != (uintptr_t)buffer) {
 		pr_err("mbox: Response buffer mismatch\n");
 		return -EIO;
 	}
diff --git a/images/Makefile.bcm283x b/images/Makefile.bcm283x
index b591cd58f563..f4ef7f447ccc 100644
--- a/images/Makefile.bcm283x
+++ b/images/Makefile.bcm283x
@@ -3,6 +3,10 @@
 # barebox image generation Makefile for BCM283x images
 #
 
+# New boards use board-dt-2nd.img as common binary
+# and have the videocore pass the correct DT.
+ifeq ($(CONFIG_32BIT),y)
+
 pblb-$(CONFIG_MACH_RPI) += start_raspberry_pi1
 FILE_barebox-raspberry-pi-1.img = start_raspberry_pi1.pblb
 image-$(CONFIG_MACH_RPI) += barebox-raspberry-pi-1.img
@@ -19,6 +23,8 @@ pblb-$(CONFIG_MACH_RPI_CM3) += start_raspberry_pi_cm3
 FILE_barebox-raspberry-pi-cm3.img = start_raspberry_pi_cm3.pblb
 image-$(CONFIG_MACH_RPI_CM3) += barebox-raspberry-pi-cm3.img
 
+endif
+
 pblb-$(CONFIG_MACH_RPI_COMMON) += start_raspberry_pi_generic
 FILE_barebox-raspberry-pi.img = start_raspberry_pi_generic.pblb
 image-$(CONFIG_MACH_RPI_COMMON) += barebox-raspberry-pi.img
-- 
2.30.2