From c08cfc2d2cf43c443f74549aefd7a7f2ffc3d7de Mon Sep 17 00:00:00 2001 From: Michal Simek Date: Fri, 23 Jan 2015 09:45:12 +0100 Subject: ARM: zynq: Enable the Neon instructions Added the lowlevel_init to enable the Neon instructions. Initially the u-boot was causing undefined instruction exception if loaded through tcl, and working fine if loaded through FSBL. The exception was causing in convertion formula of given time to ticks. It was because, the Neon instructions were disabled and hence causing the undefined exception. In FSBL case, the FSBL was enabling the Neon instructions. Hence, added the lowlevel_init to enable the Neon instructions. Also enable neon instructions for non-xilinx toolchain. Signed-off-by: Siva Durga Prasad Paladugu Acked-by: Radhey Shyam Pandey Signed-off-by: Michal Simek --- arch/arm/cpu/armv7/zynq/Makefile | 1 + arch/arm/cpu/armv7/zynq/config.mk | 7 +++++++ arch/arm/cpu/armv7/zynq/cpu.c | 3 --- arch/arm/cpu/armv7/zynq/lowlevel_init.S | 26 ++++++++++++++++++++++++++ 4 files changed, 34 insertions(+), 3 deletions(-) create mode 100644 arch/arm/cpu/armv7/zynq/config.mk create mode 100644 arch/arm/cpu/armv7/zynq/lowlevel_init.S (limited to 'arch/arm/cpu/armv7') diff --git a/arch/arm/cpu/armv7/zynq/Makefile b/arch/arm/cpu/armv7/zynq/Makefile index 3363a3c..901f2ce 100644 --- a/arch/arm/cpu/armv7/zynq/Makefile +++ b/arch/arm/cpu/armv7/zynq/Makefile @@ -13,4 +13,5 @@ obj-y += cpu.o obj-y += ddrc.o obj-y += slcr.o obj-y += clk.o +obj-y += lowlevel_init.o obj-$(CONFIG_SPL_BUILD) += spl.o diff --git a/arch/arm/cpu/armv7/zynq/config.mk b/arch/arm/cpu/armv7/zynq/config.mk new file mode 100644 index 0000000..778a377 --- /dev/null +++ b/arch/arm/cpu/armv7/zynq/config.mk @@ -0,0 +1,7 @@ +# +# Copyright (C) 2013 - 2015 Xilinx, Inc. All rights reserved. +# +# SPDX-License-Identifier: GPL-2.0 +# +# Allow NEON instructions (needed for lowlevel_init.S with GNU toolchain) +PLATFORM_RELFLAGS += -mfpu=neon diff --git a/arch/arm/cpu/armv7/zynq/cpu.c b/arch/arm/cpu/armv7/zynq/cpu.c index 816d0c5..d1bfec9 100644 --- a/arch/arm/cpu/armv7/zynq/cpu.c +++ b/arch/arm/cpu/armv7/zynq/cpu.c @@ -10,9 +10,6 @@ #include #include -void lowlevel_init(void) -{ -} #define ZYNQ_SILICON_VER_MASK 0xF0000000 #define ZYNQ_SILICON_VER_SHIFT 28 diff --git a/arch/arm/cpu/armv7/zynq/lowlevel_init.S b/arch/arm/cpu/armv7/zynq/lowlevel_init.S new file mode 100644 index 0000000..6d714b7 --- /dev/null +++ b/arch/arm/cpu/armv7/zynq/lowlevel_init.S @@ -0,0 +1,26 @@ +/* + * Copyright (C) 2013 Xilinx, Inc. All rights reserved. + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include +#include +#include + +ENTRY(lowlevel_init) + + /* Enable the the VFP */ + mrc p15, 0, r1, c1, c0, 2 + orr r1, r1, #(0x3 << 20) + orr r1, r1, #(0x3 << 20) + mcr p15, 0, r1, c1, c0, 2 + isb + fmrx r1, FPEXC + orr r1,r1, #(1<<30) + fmxr FPEXC, r1 + + /* Move back to caller */ + mov pc, lr + +ENDPROC(lowlevel_init) -- cgit v1.1