From 26e30c6489f4774492c168c7b953e575a16765f7 Mon Sep 17 00:00:00 2001 From: Johannes Berg Date: Wed, 27 Jan 2016 17:59:36 +0100 Subject: [PATCH] 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 Signed-off-by: Shawn Guo --- arch/arm/include/debug/imx.S | 3 +++ arch/arm/mach-imx/Kconfig | 1 + arch/arm/mach-imx/headsmp.S | 2 ++ 3 files changed, 6 insertions(+) diff --git a/arch/arm/include/debug/imx.S b/arch/arm/include/debug/imx.S index 619d8cc1ac12..92c44760d656 100644 --- a/arch/arm/include/debug/imx.S +++ b/arch/arm/include/debug/imx.S @@ -11,6 +11,7 @@ * */ +#include #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 da42fdf7470b..ecc374060c27 100644 --- a/arch/arm/mach-imx/Kconfig +++ b/arch/arm/mach-imx/Kconfig @@ -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 diff --git a/arch/arm/mach-imx/headsmp.S b/arch/arm/mach-imx/headsmp.S index b5e976816b63..6c28d28b3c64 100644 --- a/arch/arm/mach-imx/headsmp.S +++ b/arch/arm/mach-imx/headsmp.S @@ -12,6 +12,7 @@ #include #include +#include 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)