linux-kernel - [PATCH 15/15] MIPS: malta: setup post-I/O hole RAM on non-EVA

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Message-ID: <1432309875-9712-16-git-send-email-paul.burton@imgtec.com>
Date:	Fri, 22 May 2015 16:51:14 +0100
From:	Paul Burton <paul.burton@...tec.com>
To:	<linux-mips@...ux-mips.org>
CC:	<devicetree@...r.kernel.org>, Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	"Paul Burton" <paul.burton@...tec.com>,
	Ralf Baechle <ralf@...ux-mips.org>,
	<linux-kernel@...r.kernel.org>
Subject: [PATCH 15/15] MIPS: malta: setup post-I/O hole RAM on non-EVA

If the system has more than 256MB RAM (ie. more than will fit in the
unmapped kseg[01] regions before the I/O hole) then set up a region to
use that memory via its alias in the upper half of the physical address
space, where the I/O hole is not present. This allows highmem to be used
on Malta without needing to manually specify mem= parameters on the
kernel command line.

Signed-off-by: Paul Burton <paul.burton@...tec.com>
---

 arch/mips/mti-malta/malta-dtshim.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/arch/mips/mti-malta/malta-dtshim.c b/arch/mips/mti-malta/malta-dtshim.c
index 9074951..6320b44 100644
--- a/arch/mips/mti-malta/malta-dtshim.c
+++ b/arch/mips/mti-malta/malta-dtshim.c
@@ -23,7 +23,7 @@ static unsigned char fdt_buf[16 << 10] __initdata;
 /* determined physical memory size, not overridden by command line args	 */
 extern unsigned long physical_memsize;
 
-#define MAX_MEM_ARRAY_ENTRIES 1
+#define MAX_MEM_ARRAY_ENTRIES 2
 
 static unsigned __init gen_fdt_mem_array(__be32 *mem_array, unsigned long size)
 {
@@ -37,6 +37,12 @@ static unsigned __init gen_fdt_mem_array(__be32 *mem_array, unsigned long size)
 	} else {
 		size_preio = min_t(unsigned long, size, 256 << 20);
 		mem_array[1] = cpu_to_be32(PHYS_OFFSET + size_preio);
+
+		if (size > size_preio) {
+			entries++;
+			mem_array[2] = cpu_to_be32(0x80000000 + size_preio);
+			mem_array[3] = cpu_to_be32(size - size_preio);
+		}
 	}
 
 	BUG_ON(entries > MAX_MEM_ARRAY_ENTRIES);
-- 
2.4.1

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