davinci: add arch_ioremap() which uses existing static mappings

Add arch-specific ioremap() which uses any existing static mappings in
place of doing a new mapping.  From now on, drivers should always use
ioremap() instead of IO_ADDRESS().

In addition, remove the davinci_[read|write]* macros in favor of using
ioremap.

Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>

1 files changed, 21 insertions, 1 deletions

diff --git a/arch/arm/mach-davinci/io.c b/arch/arm/mach-davinci/io.c
index 71a7ae3..a548abb 100644
--- a/arch/arm/mach-davinci/io.c
+++ b/arch/arm/mach-davinci/io.c
@@ -51,6 +51,26 @@ void __init davinci_map_common_io(void)
 	davinci_check_revision();
 }
 
-void __init davinci_init_common_hw(void)
+#define BETWEEN(p, st, sz)	((p) >= (st) && (p) < ((st) + (sz)))
+#define XLATE(p, pst, vst)	((void __iomem *)((p) - (pst) + (vst)))
+
+/*
+ * Intercept ioremap() requests for addresses in our fixed mapping regions.
+ */
+void __iomem *davinci_ioremap(unsigned long p, size_t size, unsigned int type)
+{
+	if (BETWEEN(p, IO_PHYS, IO_SIZE))
+		return XLATE(p, IO_PHYS, IO_VIRT);
+
+	return __arm_ioremap(p, size, type);
+}
+EXPORT_SYMBOL(davinci_ioremap);
+
+void davinci_iounmap(volatile void __iomem *addr)
 {
+	unsigned long virt = (unsigned long)addr;
+
+	if (virt >= VMALLOC_START && virt < VMALLOC_END)
+		__iounmap(addr);
 }
+EXPORT_SYMBOL(davinci_iounmap);