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authorSteven J. Hill <sjhill@mips.com>2012-06-26 06:11:03 +0200
committerSteven J. Hill <sjhill@mips.com>2012-09-13 22:21:47 +0200
commit006a851b10a395955c153a145ad8241494d43688 (patch)
treee636786a07cf84b2e587c5403564465a9d5e8fd4 /arch
parentLinux 3.6-rc3 (diff)
downloadlinux-006a851b10a395955c153a145ad8241494d43688.tar.xz
linux-006a851b10a395955c153a145ad8241494d43688.zip
MIPS: Add support for the 1074K core.
Signed-off-by: Steven J. Hill <sjhill@mips.com>
Diffstat (limited to 'arch')
-rw-r--r--arch/mips/include/asm/cpu.h1
-rw-r--r--arch/mips/include/asm/mipsregs.h2
-rw-r--r--arch/mips/kernel/cpu-probe.c4
-rw-r--r--arch/mips/mm/c-r4k.c21
4 files changed, 28 insertions, 0 deletions
diff --git a/arch/mips/include/asm/cpu.h b/arch/mips/include/asm/cpu.h
index f21b7c04e95a..20c27501b2a8 100644
--- a/arch/mips/include/asm/cpu.h
+++ b/arch/mips/include/asm/cpu.h
@@ -94,6 +94,7 @@
#define PRID_IMP_24KE 0x9600
#define PRID_IMP_74K 0x9700
#define PRID_IMP_1004K 0x9900
+#define PRID_IMP_1074K 0x9a00
#define PRID_IMP_M14KC 0x9c00
/*
diff --git a/arch/mips/include/asm/mipsregs.h b/arch/mips/include/asm/mipsregs.h
index 7f87d824eeb0..60731ff40f41 100644
--- a/arch/mips/include/asm/mipsregs.h
+++ b/arch/mips/include/asm/mipsregs.h
@@ -596,6 +596,8 @@
#define MIPS_CONF4_MMUEXTDEF (_ULCAST_(3) << 14)
#define MIPS_CONF4_MMUEXTDEF_MMUSIZEEXT (_ULCAST_(1) << 14)
+#define MIPS_CONF6_SYND (_ULCAST_(1) << 13)
+
#define MIPS_CONF7_WII (_ULCAST_(1) << 31)
#define MIPS_CONF7_RPS (_ULCAST_(1) << 2)
diff --git a/arch/mips/kernel/cpu-probe.c b/arch/mips/kernel/cpu-probe.c
index 1b51046191e8..ed3eaf6409b4 100644
--- a/arch/mips/kernel/cpu-probe.c
+++ b/arch/mips/kernel/cpu-probe.c
@@ -857,6 +857,10 @@ static inline void cpu_probe_mips(struct cpuinfo_mips *c, unsigned int cpu)
c->cputype = CPU_1004K;
__cpu_name[cpu] = "MIPS 1004Kc";
break;
+ case PRID_IMP_1074K:
+ c->cputype = CPU_74K;
+ __cpu_name[cpu] = "MIPS 1074Kc";
+ break;
}
spram_config();
diff --git a/arch/mips/mm/c-r4k.c b/arch/mips/mm/c-r4k.c
index f092c265dc63..4c32ede464b5 100644
--- a/arch/mips/mm/c-r4k.c
+++ b/arch/mips/mm/c-r4k.c
@@ -786,6 +786,25 @@ static inline void rm7k_erratum31(void)
}
}
+static inline void alias_74k_erratum(struct cpuinfo_mips *c)
+{
+ /*
+ * Early versions of the 74K do not update the cache tags on a
+ * vtag miss/ptag hit which can occur in the case of KSEG0/KUSEG
+ * aliases. In this case it is better to treat the cache as always
+ * having aliases.
+ */
+ if ((c->processor_id & 0xff) <= PRID_REV_ENCODE_332(2, 4, 0))
+ c->dcache.flags |= MIPS_CACHE_VTAG;
+ if ((c->processor_id & 0xff) == PRID_REV_ENCODE_332(2, 4, 0))
+ write_c0_config6(read_c0_config6() | MIPS_CONF6_SYND);
+ if (((c->processor_id & 0xff00) == PRID_IMP_1074K) &&
+ ((c->processor_id & 0xff) <= PRID_REV_ENCODE_332(1, 1, 0))) {
+ c->dcache.flags |= MIPS_CACHE_VTAG;
+ write_c0_config6(read_c0_config6() | MIPS_CONF6_SYND);
+ }
+}
+
static char *way_string[] __cpuinitdata = { NULL, "direct mapped", "2-way",
"3-way", "4-way", "5-way", "6-way", "7-way", "8-way"
};
@@ -1056,6 +1075,8 @@ static void __cpuinit probe_pcache(void)
case CPU_34K:
case CPU_74K:
case CPU_1004K:
+ if (c->cputype == CPU_74K)
+ alias_74k_erratum(c);
if ((read_c0_config7() & (1 << 16))) {
/* effectively physically indexed dcache,
thus no virtual aliases. */