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| author | Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com> | 2018-10-04 16:12:12 +0300 |
|---|---|---|
| committer | Vineet Gupta <vgupta@synopsys.com> | 2018-11-12 10:38:27 -0800 |
| commit | 3624379d90ad2b65f9dbb30d7f7ce5498d2fe322 (patch) | |
| tree | 3f16fff94e092684e752fc241673505c98e0f169 /arch/arc/include | |
| parent | 2c519f583e84eb578d4db48e38160f58aafad2ac (diff) | |
| download | linux-3624379d90ad2b65f9dbb30d7f7ce5498d2fe322.tar.bz2 | |
ARC: IOC: panic if kernel was started with previously enabled IOC
If IOC was already enabled (due to bootloader) it technically needs to
be reconfigured with aperture base,size corresponding to Linux memory map
which will certainly be different than uboot's. But disabling and
reenabling IOC when DMA might be potentially active is tricky business.
To avoid random memory issues later, just panic here and ask user to
upgrade bootloader to one which doesn't enable IOC
This was actually seen as issue on some of the HSDK board with a version
of uboot which enabled IOC. There were random issues later with starting
of X or peripherals etc.
Also while I'm at it, replace hardcoded bits in ARC_REG_IO_COH_PARTIAL
and ARC_REG_IO_COH_ENABLE registers by definitions.
Inspired by: https://lkml.org/lkml/2018/1/19/557
Signed-off-by: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Diffstat (limited to 'arch/arc/include')
| -rw-r--r-- | arch/arc/include/asm/cache.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/arc/include/asm/cache.h b/arch/arc/include/asm/cache.h index ff7d3232764a..f393b663413e 100644 --- a/arch/arc/include/asm/cache.h +++ b/arch/arc/include/asm/cache.h @@ -113,7 +113,9 @@ extern unsigned long perip_base, perip_end; /* IO coherency related Auxiliary registers */ #define ARC_REG_IO_COH_ENABLE 0x500 +#define ARC_IO_COH_ENABLE_BIT BIT(0) #define ARC_REG_IO_COH_PARTIAL 0x501 +#define ARC_IO_COH_PARTIAL_BIT BIT(0) #define ARC_REG_IO_COH_AP0_BASE 0x508 #define ARC_REG_IO_COH_AP0_SIZE 0x509 |