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ARM: imx: enable big endian mode

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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>
This commit is contained in:
Johannes Berg 2016-01-27 17:59:36 +01:00 committed by Shawn Guo
parent c553138fbd
commit 26e30c6489
3 changed files with 6 additions and 0 deletions
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3
arch/arm/include/debug/imx.S
View file

@ -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

1
arch/arm/mach-imx/Kconfig
View file

@ -2,6 +2,7 @@ menuconfig ARCH_MXC
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

2
arch/arm/mach-imx/headsmp.S
View file

@ -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 @@ diag_reg_offset:
.endm
ENTRY(v7_secondary_startup)
ARM_BE8(setend be) @ go BE8 if entered LE
set_diag_reg
b secondary_startup
ENDPROC(v7_secondary_startup)