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| author | ken kuo <ken.kuoky@gmail.com> | 2013-07-25 02:17:11 +0800 |
|---|---|---|
| committer | Macpaul Lin <macpaul@gmail.com> | 2013-07-25 16:54:19 +0800 |
| commit | c54fd3efa497876a33cc3c6e7df514ae53abc729 (patch) | |
| tree | d641418958a482f81e19df6ebba951497f373186 /arch/nds32/cpu/n1213/ag101/lowlevel_init.S | |
| parent | 99ca91b6d77aeb983008d33dba0ef06c8e644d94 (diff) | |
| download | blackbird-obmc-uboot-c54fd3efa497876a33cc3c6e7df514ae53abc729.tar.gz blackbird-obmc-uboot-c54fd3efa497876a33cc3c6e7df514ae53abc729.zip | |
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>
Diffstat (limited to 'arch/nds32/cpu/n1213/ag101/lowlevel_init.S')
| -rw-r--r-- | arch/nds32/cpu/n1213/ag101/lowlevel_init.S | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/arch/nds32/cpu/n1213/ag101/lowlevel_init.S b/arch/nds32/cpu/n1213/ag101/lowlevel_init.S index 55985cf559..021de8608c 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) |
