ARM: imx: enable big endian mode
Enable ARM big-endian mode on mach-imx. This requires adding some
byte swapping in the debug functions (which otherwise hang forever)
and of course the secondary core bringup.
Tested (on top of 4.4) on i.MX6 HummingBoard quad-core (IMX6Q).
The patch is pretty much as suggested by Arnd Bergmann, thanks!
Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
diff --git a/arch/arm/include/debug/imx.S b/arch/arm/include/debug/imx.S
index 619d8cc..92c4476 100644
--- a/arch/arm/include/debug/imx.S
+++ b/arch/arm/include/debug/imx.S
@@ -11,6 +11,7 @@
*
*/
+#include <asm/assembler.h>
#include "imx-uart.h"
/*
@@ -34,6 +35,7 @@
.endm
.macro senduart,rd,rx
+ ARM_BE8(rev \rd, \rd)
str \rd, [\rx, #0x40] @ TXDATA
.endm
@@ -42,6 +44,7 @@
.macro busyuart,rd,rx
1002: ldr \rd, [\rx, #0x98] @ SR2
+ ARM_BE8(rev \rd, \rd)
tst \rd, #1 << 3 @ TXDC
beq 1002b @ wait until transmit done
.endm
diff --git a/arch/arm/mach-imx/Kconfig b/arch/arm/mach-imx/Kconfig
index da42fdf..ecc3740 100644
--- a/arch/arm/mach-imx/Kconfig
+++ b/arch/arm/mach-imx/Kconfig
@@ -2,6 +2,7 @@
bool "Freescale i.MX family"
depends on ARCH_MULTI_V4_V5 || ARCH_MULTI_V6_V7 || ARM_SINGLE_ARMV7M
select ARCH_REQUIRE_GPIOLIB
+ select ARCH_SUPPORTS_BIG_ENDIAN
select ARM_CPU_SUSPEND if PM
select CLKSRC_IMX_GPT
select GENERIC_IRQ_CHIP
diff --git a/arch/arm/mach-imx/headsmp.S b/arch/arm/mach-imx/headsmp.S
index b5e9768..6c28d28 100644
--- a/arch/arm/mach-imx/headsmp.S
+++ b/arch/arm/mach-imx/headsmp.S
@@ -12,6 +12,7 @@
#include <linux/linkage.h>
#include <linux/init.h>
+#include <asm/assembler.h>
diag_reg_offset:
.word g_diag_reg - .
@@ -25,6 +26,7 @@
.endm
ENTRY(v7_secondary_startup)
+ARM_BE8(setend be) @ go BE8 if entered LE
set_diag_reg
b secondary_startup
ENDPROC(v7_secondary_startup)