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authorMarkos Chandras <markos.chandras@imgtec.com>2014-01-15 14:11:43 +0000
committerRalf Baechle <ralf@linux-mips.org>2014-03-26 23:09:19 +0100
commitc9fede2afc00c493b33eb607086d4e1d7a220fc1 (patch)
tree3cb006e9e975408d5703c38fd13ff87738c33b95
parentf8b7faf17b36af3f2d0db0dbd3e60358965152fa (diff)
downloadlinux-c9fede2afc00c493b33eb607086d4e1d7a220fc1.tar.bz2
MIPS: malta: spaces.h: Add spaces.h file for Malta (EVA)
Add a spaces.h file for Malta to override certain memory macros when operating in EVA mode. Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>
-rw-r--r--arch/mips/include/asm/mach-malta/spaces.h46
1 files changed, 46 insertions, 0 deletions
diff --git a/arch/mips/include/asm/mach-malta/spaces.h b/arch/mips/include/asm/mach-malta/spaces.h
new file mode 100644
index 000000000000..d7e54971ec66
--- /dev/null
+++ b/arch/mips/include/asm/mach-malta/spaces.h
@@ -0,0 +1,46 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2014 Imagination Technologies Ltd.
+ */
+
+#ifndef _ASM_MALTA_SPACES_H
+#define _ASM_MALTA_SPACES_H
+
+#ifdef CONFIG_EVA
+
+/*
+ * Traditional Malta Board Memory Map for EVA
+ *
+ * 0x00000000 - 0x0fffffff: 1st RAM region, 256MB
+ * 0x10000000 - 0x1bffffff: GIC and CPC Control Registers
+ * 0x1c000000 - 0x1fffffff: I/O And Flash
+ * 0x20000000 - 0x7fffffff: 2nd RAM region, 1.5GB
+ * 0x80000000 - 0xffffffff: Physical memory aliases to 0x0 (2GB)
+ *
+ * The kernel is still located in 0x80000000(kseg0). However,
+ * the physical mask has been shifted to 0x80000000 which exploits the alias
+ * on the Malta board. As a result of which, we override the __pa_symbol
+ * to peform direct mapping from virtual to physical addresses. In other
+ * words, the 0x80000000 virtual address maps to 0x80000000 physical address
+ * which in turn aliases to 0x0. We do this in order to be able to use a flat
+ * 2GB of memory (0x80000000 - 0xffffffff) so we can avoid the I/O hole in
+ * 0x10000000 - 0x1fffffff.
+ * The last 64KB of physical memory are reserved for correct HIGHMEM
+ * macros arithmetics.
+ *
+ */
+
+#define PAGE_OFFSET _AC(0x0, UL)
+#define PHYS_OFFSET _AC(0x80000000, UL)
+#define HIGHMEM_START _AC(0xffff0000, UL)
+
+#define __pa_symbol(x) (RELOC_HIDE((unsigned long)(x), 0))
+
+#endif /* CONFIG_EVA */
+
+#include <asm/mach-generic/spaces.h>
+
+#endif /* _ASM_MALTA_SPACES_H */