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| author | David Daney <david.daney@cavium.com> | 2015-01-15 14:11:10 +0100 |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 2015-02-20 15:30:42 +0100 |
| commit | 664d699af24ee73cbc147c4c0f76c8c8ff9ef66f (patch) | |
| tree | 364a6315b49e725a956ef18e08611c87c776b767 /arch | |
| parent | MIPS: OCTEON: Delete unused COP2 saving code (diff) | |
| download | linux-664d699af24ee73cbc147c4c0f76c8c8ff9ef66f.tar.xz linux-664d699af24ee73cbc147c4c0f76c8c8ff9ef66f.zip | |
MIPS: OCTEON: Implement the core-16057 workaround
Disable ICache prefetch for certian Octeon II processors.
Signed-off-by: David Daney <david.daney@cavium.com>
Signed-off-by: Aleksey Makarov <aleksey.makarov@auriga.com>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/8938/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/mips/include/asm/mach-cavium-octeon/kernel-entry-init.h | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/arch/mips/include/asm/mach-cavium-octeon/kernel-entry-init.h b/arch/mips/include/asm/mach-cavium-octeon/kernel-entry-init.h index 1668ee57acb9..21732c306635 100644 --- a/arch/mips/include/asm/mach-cavium-octeon/kernel-entry-init.h +++ b/arch/mips/include/asm/mach-cavium-octeon/kernel-entry-init.h @@ -63,6 +63,28 @@ skip: li v1, ~(7 << 7) and v0, v0, v1 ori v0, v0, (6 << 7) + + mfc0 v1, CP0_PRID_REG + and t1, v1, 0xfff8 + xor t1, t1, 0x9000 # 63-P1 + beqz t1, 4f + and t1, v1, 0xfff8 + xor t1, t1, 0x9008 # 63-P2 + beqz t1, 4f + and t1, v1, 0xfff8 + xor t1, t1, 0x9100 # 68-P1 + beqz t1, 4f + and t1, v1, 0xff00 + xor t1, t1, 0x9200 # 66-PX + bnez t1, 5f # Skip WAR for others. + and t1, v1, 0x00ff + slti t1, t1, 2 # 66-P1.2 and later good. + beqz t1, 5f + +4: # core-16057 work around + or v0, v0, 0x2000 # Set IPREF bit. + +5: # No core-16057 work around # Write the cavium control register dmtc0 v0, CP0_CVMCTL_REG sync |