[MIPS] Add support for BCM47XX CPUs.

Note that the BCM4710 does not support the wait instruction, this
is not a mistake in the code.
    
It originally comes from the OpenWrt patches.
    
Cc: Michael Buesch <mb@bu3sch.de>
Cc: Felix Fietkau <nbd@openwrt.org>
Cc: Florian Schirmer <jolt@tuxbox.org>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 20 insertions, 0 deletions

diff --git a/arch/mips/kernel/cpu-probe.c b/arch/mips/kernel/cpu-probe.c
index 3e004161ebd5..97c03865c06a 100644
--- a/arch/mips/kernel/cpu-probe.c
+++ b/arch/mips/kernel/cpu-probe.c
@@ -159,6 +159,7 @@ static inline void check_wait(void)
         case CPU_5KC:
         case CPU_25KF:
         case CPU_PR4450:
+        case CPU_BCM3302:
                 cpu_wait = r4k_wait;
                 break;
 
@@ -793,6 +794,22 @@ static inline void cpu_probe_philips(struct cpuinfo_mips *c)
 }
 
 
+static inline void cpu_probe_broadcom(struct cpuinfo_mips *c)
+{
+        decode_configs(c);
+        switch (c->processor_id & 0xff00) {
+        case PRID_IMP_BCM3302:
+                c->cputype = CPU_BCM3302;
+                break;
+        case PRID_IMP_BCM4710:
+                c->cputype = CPU_BCM4710;
+                break;
+        default:
+                c->cputype = CPU_UNKNOWN;
+                break;
+        }
+}
+
 __init void cpu_probe(void)
 {
         struct cpuinfo_mips *c = &current_cpu_data;
@@ -815,6 +832,9 @@ __init void cpu_probe(void)
         case PRID_COMP_SIBYTE:
                 cpu_probe_sibyte(c);
                 break;
+        case PRID_COMP_BROADCOM:
+                cpu_probe_broadcom(c);
+                break;
         case PRID_COMP_SANDCRAFT:
                 cpu_probe_sandcraft(c);
                 break;