From: gerg@uclinux.org (Greg Ungerer)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCHv3 1/4] ARM: versatile: support no-MMU mode addressing
Date: Wed, 1 Mar 2017 11:39:42 +1000 [thread overview]
Message-ID: <1488332385-3367-2-git-send-email-gerg@uclinux.org> (raw)
In-Reply-To: <1488332385-3367-1-git-send-email-gerg@uclinux.org>
Currently for the versatile boards the IO_ADDRESS() macro applies static
virtual address mapping for built-in IO devices. When operating without
the MMU enabled IO devices are accessed at their physical address, no
address translation is required.
For the !CONFIG_MMU case then define the IO_ADDRESS() macro to return the
physical address.
Signed-off-by: Greg Ungerer <gerg@uclinux.org>
---
arch/arm/mach-versatile/versatile_dt.c | 4 ++++
1 file changed, 4 insertions(+)
v2: no change
v3: rebase on top of linux-4.10
diff --git a/arch/arm/mach-versatile/versatile_dt.c b/arch/arm/mach-versatile/versatile_dt.c
index 3c8d39c..8cfa05a 100644
--- a/arch/arm/mach-versatile/versatile_dt.c
+++ b/arch/arm/mach-versatile/versatile_dt.c
@@ -37,7 +37,11 @@
#include <asm/mach/map.h>
/* macro to get at MMIO space when running virtually */
+#ifdef CONFIG_MMU
#define IO_ADDRESS(x) (((x) & 0x0fffffff) + (((x) >> 4) & 0x0f000000) + 0xf0000000)
+#else
+#define IO_ADDRESS(x) (x)
+#endif
#define __io_address(n) ((void __iomem __force *)IO_ADDRESS(n))
/*
--
1.9.1
next prev parent reply other threads:[~2017-03-01 1:39 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-03-01 1:39 [PATCHv3 0/4] arm/versatile: no-MMU support Greg Ungerer
2017-03-01 1:39 ` Greg Ungerer [this message]
2017-03-01 1:39 ` [PATCHv3 2/4] ARM: versatile: define empty debug_ll_io_init() for no-MMU Greg Ungerer
2017-03-06 11:03 ` Vladimir Murzin
2017-03-01 1:50 ` [PATCHv3 3/4] ARM: versatile: empty Makefile.boot needed for no-MMU compile Greg Ungerer
2017-03-01 1:50 ` [PATCHv3 4/4] ARM: versatile: support configuring versatile machine for no-MMU Greg Ungerer
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