From c54fd3efa497876a33cc3c6e7df514ae53abc729 Mon Sep 17 00:00:00 2001
From: ken kuo <ken.kuoky@gmail.com>
Date: Thu, 25 Jul 2013 02:17:11 +0800
Subject: [PATCH] nds32: Enable FPU if the version of CPU supported

Some version of Andes core support FPU coprocessor,
if this is the case, and toolchain support FPU instruction set,
we should enable it at low level initialization time.

Signed-off-by: Kuan-Yu Kuo <ken.kuoky@gmail.com>
Cc: Macpaul Lin <macpaul@gmail.com>
---
 arch/nds32/cpu/n1213/ag101/lowlevel_init.S | 26 ++++++++++++++++++++++++++
 arch/nds32/cpu/n1213/ag102/lowlevel_init.S | 26 ++++++++++++++++++++++++++
 2 files changed, 52 insertions(+)

diff --git a/arch/nds32/cpu/n1213/ag101/lowlevel_init.S b/arch/nds32/cpu/n1213/ag101/lowlevel_init.S
index 55985cf..021de86 100644
--- a/arch/nds32/cpu/n1213/ag101/lowlevel_init.S
+++ b/arch/nds32/cpu/n1213/ag101/lowlevel_init.S
@@ -98,6 +98,11 @@ lowlevel_init:
 	led	0x10
 	jal	remap
 
+#if (defined(NDS32_EXT_FPU_DP) || defined(NDS32_EXT_FPU_SP))
+	led	0x1f
+	jal	enable_fpu
+#endif
+
 	led	0x20
 	ret	$r10
 
@@ -234,6 +239,27 @@ relo_base:
 2:
 	ret
 
+	/*
+	 * enable_fpu:
+	 *  Some of Andes CPU version support FPU coprocessor, if so,
+	 *  and toolchain support FPU instruction set, we should enable it.
+	 */
+#if (defined(NDS32_EXT_FPU_DP) || defined(NDS32_EXT_FPU_SP))
+enable_fpu:
+	mfsr    $r0, $CPU_VER     /* enable FPU if it exists */
+	srli    $r0, $r0, 3
+	andi    $r0, $r0, 1
+	beqz    $r0, 1f           /* skip if no COP */
+	mfsr    $r0, $FUCOP_EXIST
+	srli    $r0, $r0, 31
+	beqz    $r0, 1f           /* skip if no FPU */
+	mfsr    $r0, $FUCOP_CTL
+	ori     $r0, $r0, 1
+	mtsr    $r0, $FUCOP_CTL
+1:
+	ret
+#endif
+
 .globl show_led
 show_led:
     li      $r8, (CONFIG_DEBUG_LED)
diff --git a/arch/nds32/cpu/n1213/ag102/lowlevel_init.S b/arch/nds32/cpu/n1213/ag102/lowlevel_init.S
index d842afa..d3b9e16 100644
--- a/arch/nds32/cpu/n1213/ag102/lowlevel_init.S
+++ b/arch/nds32/cpu/n1213/ag102/lowlevel_init.S
@@ -114,6 +114,11 @@ lowlevel_init:
 	led	0x20
 	jal	remap
 
+#if (defined(NDS32_EXT_FPU_DP) || defined(NDS32_EXT_FPU_SP))
+	led	0x2f
+	jal	enable_fpu
+#endif
+
 	led	0x30
 	ret	$r10
 
@@ -289,6 +294,27 @@ relo_base:
 2:
 	ret
 
+	/*
+	 * enable_fpu:
+	 *  Some of Andes CPU version support FPU coprocessor, if so,
+	 *  and toolchain support FPU instruction set, we should enable it.
+	 */
+#if (defined(NDS32_EXT_FPU_DP) || defined(NDS32_EXT_FPU_SP))
+enable_fpu:
+	mfsr    $r0, $CPU_VER     /* enable FPU if it exists */
+	srli    $r0, $r0, 3
+	andi    $r0, $r0, 1
+	beqz    $r0, 1f           /* skip if no COP */
+	mfsr    $r0, $FUCOP_EXIST
+	srli    $r0, $r0, 31
+	beqz    $r0, 1f           /* skip if no FPU */
+	mfsr    $r0, $FUCOP_CTL
+	ori     $r0, $r0, 1
+	mtsr    $r0, $FUCOP_CTL
+1:
+	ret
+#endif
+
 .globl show_led
 show_led:
     li      $r8, (CONFIG_DEBUG_LED)
-- 
2.7.4