From: Kuan-Yu Kuo <ken.kuoky@gmail.com>
To: u-boot@lists.denx.de
Subject: [U-Boot] [PATCH v2] nds32: Enable FPU if the version of CPU supported
Date: Thu, 25 Jul 2013 02:17:11 +0800 [thread overview]
Message-ID: <1374689831-10024-1-git-send-email-ken.kuoky@gmail.com> (raw)
In-Reply-To: <1374081632-3684-1-git-send-email-ken.kuoky@gmail.com>
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>
---
Change for v2:
- Add compile option to determine if current used toolchain support
FPU instruction or not.
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)
--
1.7.9.5
next prev parent reply other threads:[~2013-07-24 18:17 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-07-17 17:20 [U-Boot] [PATCH] nds32: Enable FPU if the version of CPU supported Kuan-Yu Kuo
2013-07-18 7:16 ` uboot at andestech.com
2013-07-24 5:20 ` Macpaul Lin
2013-07-24 18:17 ` Kuan-Yu Kuo [this message]
2013-07-25 9:44 ` [U-Boot] [PATCH v2] " Macpaul Lin
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