diff options
| author | Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com> | 2018-01-16 19:20:28 +0300 |
|---|---|---|
| committer | Alexey Brodkin <abrodkin@synopsys.com> | 2018-01-19 17:59:34 +0300 |
| commit | b0146f9e29ca2e82262416aca65395c322a618f9 (patch) | |
| tree | b4b98c4f9f067b5258abd5189adbb192291317f9 /arch/arc | |
| parent | 41cada4d2499705b321ab650891e76088d330a37 (diff) | |
ARC: Cache: Disable IOC by default
We'd like to keep IOC HW at the same state as t is right after reset when we
start Linux kernel so there will be no re-configuration of IOC on the go.
The point is U-Boot doesn't benefit a lot from IOC as it doesn't do a
lot of DMA operations especially on multiple cores simultaneously.
At the same time re-configuration of IOC in run-time might become quite
a tricky experience because we need to make sure there're no DMA
trannsactions in flight otherwise unexpected consequencses might affect
us much later and debugging those kinds of issues will be a real
nightmare.
That said let's make our life easier a little bit.
Signed-off-by: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>
Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
Diffstat (limited to 'arch/arc')
| -rw-r--r-- | arch/arc/lib/cache.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/arch/arc/lib/cache.c b/arch/arc/lib/cache.c index a6bbe3ce5d..d17948dbaf 100644 --- a/arch/arc/lib/cache.c +++ b/arch/arc/lib/cache.c @@ -48,6 +48,9 @@ bool slc_exists __section(".data") = false; bool ioc_exists __section(".data") = false; bool pae_exists __section(".data") = false; +/* To force enable IOC set ioc_enable to 'true' */ +bool ioc_enable __section(".data") = false; + void read_decode_mmu_bcr(void) { /* TODO: should we compare mmu version from BCR and from CONFIG? */ @@ -200,7 +203,7 @@ static void read_decode_cache_bcr_arcv2(void) } cbcr; cbcr.word = read_aux_reg(ARC_BCR_CLUSTER); - if (cbcr.fields.c) + if (cbcr.fields.c && ioc_enable) ioc_exists = true; } #endif |