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Commit 26e30c64 authored by Johannes Berg's avatar Johannes Berg Committed by Shawn Guo
Browse files

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: default avatarJohannes Berg <johannes@sipsolutions.net>
Signed-off-by: default avatarShawn Guo <shawnguo@kernel.org>
parent c553138f

arch/arm/include/debug/imx.S

+3 −0
Original line number Diff line number Diff line
@@ -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

arch/arm/mach-imx/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -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

arch/arm/mach-imx/headsmp.S

+2 −0
Original line number Diff line number Diff line
@@ -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)