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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-12-15 14:52:16 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-12-15 14:52:16 -0300
commit8d91c1e411f55d7ea91b1183a2e9f8088fb4d5be (patch)
treee9891aa6c295060d065adffd610c4f49ecf884f3 /arch/mips/mm/sc-mips.c
parenta71852147516bc1cb5b0b3cbd13639bfd4022dc8 (diff)
Linux-libre 4.3.2-gnu
Diffstat (limited to 'arch/mips/mm/sc-mips.c')
-rw-r--r--arch/mips/mm/sc-mips.c42
1 files changed, 42 insertions, 0 deletions
diff --git a/arch/mips/mm/sc-mips.c b/arch/mips/mm/sc-mips.c
index 4ceafd138..53ea8391f 100644
--- a/arch/mips/mm/sc-mips.c
+++ b/arch/mips/mm/sc-mips.c
@@ -14,6 +14,7 @@
#include <asm/pgtable.h>
#include <asm/mmu_context.h>
#include <asm/r4kcache.h>
+#include <asm/mips-cm.h>
/*
* MIPS32/MIPS64 L2 cache handling
@@ -94,6 +95,38 @@ static inline int mips_sc_is_activated(struct cpuinfo_mips *c)
return 1;
}
+static int __init mips_sc_probe_cm3(void)
+{
+ struct cpuinfo_mips *c = &current_cpu_data;
+ unsigned long cfg = read_gcr_l2_config();
+ unsigned long sets, line_sz, assoc;
+
+ if (cfg & CM_GCR_L2_CONFIG_BYPASS_MSK)
+ return 0;
+
+ sets = cfg & CM_GCR_L2_CONFIG_SET_SIZE_MSK;
+ sets >>= CM_GCR_L2_CONFIG_SET_SIZE_SHF;
+ c->scache.sets = 64 << sets;
+
+ line_sz = cfg & CM_GCR_L2_CONFIG_LINE_SIZE_MSK;
+ line_sz >>= CM_GCR_L2_CONFIG_LINE_SIZE_SHF;
+ c->scache.linesz = 2 << line_sz;
+
+ assoc = cfg & CM_GCR_L2_CONFIG_ASSOC_MSK;
+ assoc >>= CM_GCR_L2_CONFIG_ASSOC_SHF;
+ c->scache.ways = assoc + 1;
+ c->scache.waysize = c->scache.sets * c->scache.linesz;
+ c->scache.waybit = __ffs(c->scache.waysize);
+
+ c->scache.flags &= ~MIPS_CACHE_NOT_PRESENT;
+
+ return 1;
+}
+
+void __weak platform_early_l2_init(void)
+{
+}
+
static inline int __init mips_sc_probe(void)
{
struct cpuinfo_mips *c = &current_cpu_data;
@@ -103,6 +136,15 @@ static inline int __init mips_sc_probe(void)
/* Mark as not present until probe completed */
c->scache.flags |= MIPS_CACHE_NOT_PRESENT;
+ /*
+ * Do we need some platform specific probing before
+ * we configure L2?
+ */
+ platform_early_l2_init();
+
+ if (mips_cm_revision() >= CM_REV_CM3)
+ return mips_sc_probe_cm3();
+
/* Ignore anything but MIPSxx processors */
if (!(c->isa_level & (MIPS_CPU_ISA_M32R1 | MIPS_CPU_ISA_M32R2 |
MIPS_CPU_ISA_M32R6 | MIPS_CPU_ISA_M64R1 |