ARM: shmobile: rcar-gen2: Cache Mode Monitor Register Value

[deliverable/linux.git] / arch / arm / mach-shmobile / setup-rcar-gen2.c

diff --git a/arch/arm/mach-shmobile/setup-rcar-gen2.c b/arch/arm/mach-shmobile/setup-rcar-gen2.c
index 10604480f325296347cdfc7a31ed5d40135fd7b1..542c5a47173f9e8a9794a07d39b765704b9c0d75 100644 (file)
--- a/arch/arm/mach-shmobile/setup-rcar-gen2.c
+++ b/arch/arm/mach-shmobile/setup-rcar-gen2.c
@@ -30,12 +30,16 @@
 
 u32 rcar_gen2_read_mode_pins(void)
 {
-       void __iomem *modemr = ioremap_nocache(MODEMR, 4);
-       u32 mode;
-
-       BUG_ON(!modemr);
-       mode = ioread32(modemr);
-       iounmap(modemr);
+       static u32 mode;
+       static bool mode_valid;
+
+       if (!mode_valid) {
+               void __iomem *modemr = ioremap_nocache(MODEMR, 4);
+               BUG_ON(!modemr);
+               mode = ioread32(modemr);
+               iounmap(modemr);
+               mode_valid = true;
+       }
 
        return mode;
 }