From: Huacai Chen <chenhc@lemote.com>
Date: Tue, 4 Nov 2014 06:13:24 +0000 (+0800)
Subject: MIPS: Loongson-3: Add PHYS48_TO_HT40 support
X-Git-Tag: omap-for-v3.19/fixes-rc1~122^2~138
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f490682a6b21ffed5acd7a0d49d8371e5e625d7a;p=pandora-kernel.git

MIPS: Loongson-3: Add PHYS48_TO_HT40 support

The width of HT-bus is only 40-bit, but Loongson-3 has 48-bit physical
address. This implies only node-0's memory is DMAable because high bits
(Node ID) will lost. Fortunately, by configuring address windows in
firmware, we can extract 2bit Node ID (bit 44~47, only bit 44~45 used
now) from Loongson-3's 48-bit address space and embed it into 40-bit
(bit 37~38). Every NUMA node can do DMA now (however, maximum memory of
each node is reduced to 2^37 = 128GB).

Signed-off-by: Huacai Chen <chenhc@lemote.com>
Cc: John Crispin <john@phrozen.org>
Cc: Steven J. Hill <Steven.Hill@imgtec.com>
Cc: linux-mips@linux-mips.org
Cc: Fuxin Zhang <zhangfx@lemote.com>
Cc: Zhangjin Wu <wuzhangjin@gmail.com>
Patchwork: https://patchwork.linux-mips.org/patch/8321/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
---

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