Commit c08cfc2d authored by Michal Simek's avatar Michal Simek
Browse files

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: default avatarSiva Durga Prasad Paladugu <sivadur@xilinx.com>
Acked-by: default avatarRadhey Shyam Pandey <radheys@xilinx.com>
Signed-off-by: default avatarMichal Simek <michal.simek@xilinx.com>
parent 92fa7f53
......@@ -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
#
# 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
......@@ -10,9 +10,6 @@
#include <asm/arch/sys_proto.h>
#include <asm/arch/hardware.h>
void lowlevel_init(void)
{
}
#define ZYNQ_SILICON_VER_MASK 0xF0000000
#define ZYNQ_SILICON_VER_SHIFT 28
......
/*
* Copyright (C) 2013 Xilinx, Inc. All rights reserved.
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <asm-offsets.h>
#include <config.h>
#include <linux/linkage.h>
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)
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