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| author | Steven J. Hill <sjhill@mips.com> | 2012-06-26 06:11:03 +0200 |
|---|---|---|
| committer | Steven J. Hill <sjhill@mips.com> | 2012-09-13 22:21:47 +0200 |
| commit | 006a851b10a395955c153a145ad8241494d43688 (patch) | |
| tree | e636786a07cf84b2e587c5403564465a9d5e8fd4 /arch/mips/mm/c-r4k.c | |
| parent | Linux 3.6-rc3 (diff) | |
| download | linux-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/mips/mm/c-r4k.c')
| -rw-r--r-- | arch/mips/mm/c-r4k.c | 21 |
1 files changed, 21 insertions, 0 deletions
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. */ |