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| author | Vineet Gupta <vgupta@synopsys.com> | 2015-08-03 10:07:24 (GMT) |
|---|---|---|
| committer | Vineet Gupta <vgupta@synopsys.com> | 2015-08-03 14:04:07 (GMT) |
| commit | e13c42ecbe580509451e021ba2586871e5b47640 (patch) | |
| tree | 1be3e62c4dc5acaf9a5a0e256c2dd41401127d45 /arch/arc/kernel | |
| parent | 450ed0db011d200a691591a75fdbcd7cae1a9b4a (diff) | |
| download | linux-e13c42ecbe580509451e021ba2586871e5b47640.tar.xz | |
ARCv2: Fix the peripheral address space detection
With HS 2.1 release, the peripheral space register no longer contains
the uncached space specifics, causing the kernel to panic early on.
So read the newer NON VOLATILE AUX register to get that info.
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Diffstat (limited to 'arch/arc/kernel')
| -rw-r--r-- | arch/arc/kernel/setup.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/arch/arc/kernel/setup.c b/arch/arc/kernel/setup.c index 18cc015..f2f771b 100644 --- a/arch/arc/kernel/setup.c +++ b/arch/arc/kernel/setup.c @@ -47,6 +47,7 @@ static void read_arc_build_cfg_regs(void) struct bcr_perip uncached_space; struct bcr_generic bcr; struct cpuinfo_arc *cpu = &cpuinfo_arc700[smp_processor_id()]; + unsigned long perip_space; FIX_PTR(cpu); READ_BCR(AUX_IDENTITY, cpu->core); @@ -56,7 +57,12 @@ static void read_arc_build_cfg_regs(void) cpu->vec_base = read_aux_reg(AUX_INTR_VEC_BASE); READ_BCR(ARC_REG_D_UNCACH_BCR, uncached_space); - BUG_ON((uncached_space.start << 24) != ARC_UNCACHED_ADDR_SPACE); + if (uncached_space.ver < 3) + perip_space = uncached_space.start << 24; + else + perip_space = read_aux_reg(AUX_NON_VOL) & 0xF0000000; + + BUG_ON(perip_space != ARC_UNCACHED_ADDR_SPACE); READ_BCR(ARC_REG_MUL_BCR, cpu->extn_mpy); |