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| author | Matt Redfearn <matt.redfearn@imgtec.com> | 2015-12-18 12:47:00 +0000 |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 2016-01-24 02:09:53 +0100 |
| commit | 497e803ebf98ea88c7191e67333bfcc6ffd64bc6 (patch) | |
| tree | 13da5debc46182d0033906606f0098170b91889c | |
| parent | a68f376844605399cbd28b662d5ed213639f46f7 (diff) | |
| download | lwn-497e803ebf98ea88c7191e67333bfcc6ffd64bc6.tar.gz lwn-497e803ebf98ea88c7191e67333bfcc6ffd64bc6.zip | |
MIPS: smp-cps: Ensure secondary cores start with EVA disabled
The kernel currently assumes that a core will start up in legacy mode
using the exception base provided through the CM GCR registers. If a
core has been configured in hardware to start in EVA mode, these
assumptions will fail.
This patch ensures that secondary cores are initialized to meet these
assumptions.
Signed-off-by: Matt Redfearn <matt.redfearn@imgtec.com>
Reviewed-by: Paul Burton <paul.burton@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/11907/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
| -rw-r--r-- | arch/mips/include/asm/mips-cm.h | 4 | ||||
| -rw-r--r-- | arch/mips/kernel/smp-cps.c | 3 |
2 files changed, 7 insertions, 0 deletions
diff --git a/arch/mips/include/asm/mips-cm.h b/arch/mips/include/asm/mips-cm.h index 6516e9da5133..b196825a1de9 100644 --- a/arch/mips/include/asm/mips-cm.h +++ b/arch/mips/include/asm/mips-cm.h @@ -243,6 +243,10 @@ BUILD_CM_Cx_R_(tcid_8_priority, 0x80) #define CM_GCR_BASE_CMDEFTGT_IOCU0 2 #define CM_GCR_BASE_CMDEFTGT_IOCU1 3 +/* GCR_RESET_EXT_BASE register fields */ +#define CM_GCR_RESET_EXT_BASE_EVARESET BIT(31) +#define CM_GCR_RESET_EXT_BASE_UEB BIT(30) + /* GCR_ACCESS register fields */ #define CM_GCR_ACCESS_ACCESSEN_SHF 0 #define CM_GCR_ACCESS_ACCESSEN_MSK (_ULCAST_(0xff) << 0) diff --git a/arch/mips/kernel/smp-cps.c b/arch/mips/kernel/smp-cps.c index e04c8057b882..2ad4e4c96d61 100644 --- a/arch/mips/kernel/smp-cps.c +++ b/arch/mips/kernel/smp-cps.c @@ -202,6 +202,9 @@ static void boot_core(unsigned core) /* Ensure its coherency is disabled */ write_gcr_co_coherence(0); + /* Start it with the legacy memory map and exception base */ + write_gcr_co_reset_ext_base(CM_GCR_RESET_EXT_BASE_UEB); + /* Ensure the core can access the GCRs */ access = read_gcr_access(); access |= 1 << (CM_GCR_ACCESS_ACCESSEN_SHF + core); |