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 <sivadur@xilinx.com> Acked-by: Radhey Shyam Pandey <radheys@xilinx.com> Signed-off-by: Michal Simek <michal.simek@xilinx.com>

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 <sivadur@xilinx.com> Acked-by: Radhey Shyam Pandey <radheys@xilinx.com> Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Michal Simek
1 parent 92fa7f53f1
Showing 4 changed files with 34 additions and 3 deletions Side-by-side Diff
arch/arm/cpu/armv7/zynq/Makefile
arch/arm/cpu/armv7/zynq/config.mk
arch/arm/cpu/armv7/zynq/cpu.c
arch/arm/cpu/armv7/zynq/lowlevel_init.S
@@ -13,5 +13,6 @@
 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)
...	...	@@ -13,5 +13,6 @@
13	13	obj-y += ddrc.o
14	14	obj-y += slcr.o
15	15	obj-y += clk.o
	16	+obj-y += lowlevel_init.o
16	17	obj-$(CONFIG_SPL_BUILD) += spl.o
	1	+#
	2	+# Copyright (C) 2013 - 2015 Xilinx, Inc. All rights reserved.
	3	+#
	4	+# SPDX-License-Identifier: GPL-2.0
	5	+#
	6	+# Allow NEON instructions (needed for lowlevel_init.S with GNU toolchain)
	7	+PLATFORM_RELFLAGS += -mfpu=neon
...	...	@@ -10,9 +10,6 @@
10	10	#include <asm/arch/sys_proto.h>
11	11	#include <asm/arch/hardware.h>
12	12
13		-void lowlevel_init(void)
14		-{
15		-}
16	13
17	14	#define ZYNQ_SILICON_VER_MASK 0xF0000000
18	15	#define ZYNQ_SILICON_VER_SHIFT 28
	1	+/*
	2	+ * Copyright (C) 2013 Xilinx, Inc. All rights reserved.
	3	+ *
	4	+ * SPDX-License-Identifier: GPL-2.0+
	5	+ */
	6	+
	7	+#include <asm-offsets.h>
	8	+#include <config.h>
	9	+#include <linux/linkage.h>
	10	+
	11	+ENTRY(lowlevel_init)
	12	+
	13	+ /* Enable the the VFP */
	14	+ mrc p15, 0, r1, c1, c0, 2
	15	+ orr r1, r1, #(0x3 << 20)
	16	+ orr r1, r1, #(0x3 << 20)
	17	+ mcr p15, 0, r1, c1, c0, 2
	18	+ isb
	19	+ fmrx r1, FPEXC
	20	+ orr r1,r1, #(1<<30)
	21	+ fmxr FPEXC, r1
	22	+
	23	+ /* Move back to caller */
	24	+ mov pc, lr
	25	+
	26	+ENDPROC(lowlevel_init)