ARM: tegra: Prevent dynamically ioremapping device io memory

Change-Id: I893a42bd773b1acdf2b83f8602fe1aa6a8ea6741
Signed-off-by: Colin Cross <ccross@android.com>

1 files changed, 13 insertions, 1 deletions

diff --git a/arch/arm/mach-tegra/io.c b/arch/arm/mach-tegra/io.c
index 0856818e92da..a1674da7dd81 100644
--- a/arch/arm/mach-tegra/io.c
+++ b/arch/arm/mach-tegra/io.c
@@ -86,8 +86,20 @@ void __init tegra_map_common_io(void)
 void __iomem *tegra_ioremap(unsigned long p, size_t size, unsigned int type)
 {
 	void __iomem *v = IO_ADDRESS(p);
-	if (v == NULL)
+
+	/*
+	 * __arm_ioremap fails to set the domain of ioremapped memory
+	 * correctly, only use it on physical memory.
+	 */
+	if (v == NULL && p < SZ_1G)
 		v = __arm_ioremap(p, size, type);
+
+	/*
+	 * If the physical address was not physical memory or statically
+	 * mapped, there's nothing we can do to map it safely.
+	 */
+	BUG_ON(v == NULL);
+
 	return v;
 }
 EXPORT_SYMBOL(tegra_ioremap);