From: gerg@uclinux.org (Greg Ungerer)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 1/4] ARM: versatile: support no-MMU mode addressing
Date: Wed, 7 Dec 2016 16:08:29 +1000 [thread overview]
Message-ID: <1481090912-29835-2-git-send-email-gerg@uclinux.org> (raw)
In-Reply-To: <1481090912-29835-1-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(+)
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:[~2016-12-07 6:08 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-12-07 6:08 [PATCH 0/4] arm/versatile: no-MMU support Greg Ungerer
2016-12-07 6:08 ` Greg Ungerer [this message]
2016-12-07 6:08 ` [PATCH 2/4] ARM: versatile: define empty debug_ll_io_init() for no-MMU Greg Ungerer
2016-12-07 9:23 ` [PATCH 0/4] arm/versatile: no-MMU support Vladimir Murzin
2016-12-07 13:57 ` Greg Ungerer
2016-12-07 14:13 ` Vladimir Murzin
2016-12-07 14:21 ` Greg Ungerer
2016-12-07 14:27 ` Vladimir Murzin
2016-12-07 14:40 ` Greg Ungerer
2016-12-07 14:16 ` Linus Walleij
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