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MIPS: Add arch CDMM definitions and probing

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Add architectural definitions and probing for the MIPS Common Device
Memory Map (CDMM) region. When supported and enabled at a particular
physical address, this region allows some number of per-CPU devices to
be discovered and controlled via MMIO.

A bit exists in Config3 to determine whether the feature is present, and
a CDMMBase CP0 register allows the region to be enabled at a particular
physical address.

[ralf@linux-mips.org: Sort conflict with other patches.]

Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/9178/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
James Hogan
2015-02-02 11:45:08 +00:00
committed by Ralf Baechle
parent 4a91d8fb61
commit 9b3274bd58
4 changed files with 18 additions and 0 deletions
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1
arch/mips/include/asm/cpu.h
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@@ -377,6 +377,7 @@ enum cpu_type_enum {
#define MIPS_CPU_MAAR 0x400000000ull /* MAAR(I) registers are present */
#define MIPS_CPU_FRE 0x800000000ull /* FRE & UFE bits implemented */
#define MIPS_CPU_RW_LLB 0x1000000000ull /* LLADDR/LLB writes are allowed */
#define MIPS_CPU_CDMM 0x2000000000ull /* CPU has Common Device Memory Map */
/*
* CPU ASE encodings