MIPS: detect presence of the FRE & UFR bits

Detect the presence of the Config5 FRE & UFE bits, as indicated by the
FREP bit in FPIR. Record this as a CPU option bit, and provide a
cpu_has_fre macro to ease checking of that option bit.

Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Cc: linux-mips@linux-mips.org
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: linux-fsdevel@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/7678/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 2 insertions, 0 deletions

diff --git a/arch/mips/kernel/cpu-probe.c b/arch/mips/kernel/cpu-probe.c
index b27e7ffd1112..d76f189291bc 100644
--- a/arch/mips/kernel/cpu-probe.c
+++ b/arch/mips/kernel/cpu-probe.c
@@ -1317,6 +1317,8 @@ void cpu_probe(void)
                                     MIPS_CPU_ISA_M64R1 | MIPS_CPU_ISA_M64R2)) {
                         if (c->fpu_id & MIPS_FPIR_3D)
                                 c->ases |= MIPS_ASE_MIPS3D;
+                        if (c->fpu_id & MIPS_FPIR_FREP)
+                                c->options |= MIPS_CPU_FRE;
                 }
         }