sh: fixed PMB mode refactoring.

This introduces some much overdue chainsawing of the fixed PMB support.
fixed PMB was introduced initially to work around the fact that dynamic
PMB mode was relatively broken, though they were never intended to
converge. The main areas where there are differences are whether the
system is booted in 29-bit mode or 32-bit mode, and whether legacy
mappings are to be preserved. Any system booting in true 32-bit mode will
not care about legacy mappings, so these are roughly decoupled.

Regardless of the entry point, PMB and 32BIT are directly related as far
as the kernel is concerned, so we also switch back to having one select
the other.

With legacy mappings iterated through and applied in the initialization
path it's now possible to finally merge the two implementations and
permit dynamic remapping overtop of remaining entries regardless of
whether boot mappings are crafted by hand or inherited from the boot
loader.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

1 files changed, 18 insertions, 9 deletions

diff --git a/arch/sh/include/asm/io.h b/arch/sh/include/asm/io.h
index 026dd659a64..f4314d8b05b 100644
--- a/arch/sh/include/asm/io.h
+++ b/arch/sh/include/asm/io.h
@@ -244,18 +244,11 @@ __ioremap(unsigned long offset, unsigned long size, unsigned long flags)
 }
 
 static inline void __iomem *
-__ioremap_mode(unsigned long offset, unsigned long size, unsigned long flags)
+__ioremap_29bit(unsigned long offset, unsigned long size, unsigned long flags)
 {
-#if defined(CONFIG_SUPERH32) && !defined(CONFIG_PMB_FIXED) && !defined(CONFIG_PMB)
+#ifdef CONFIG_29BIT
 	unsigned long last_addr = offset + size - 1;
-#endif
-	void __iomem *ret;
 
-	ret = __ioremap_trapped(offset, size);
-	if (ret)
-		return ret;
-
-#if defined(CONFIG_SUPERH32) && !defined(CONFIG_PMB_FIXED) && !defined(CONFIG_PMB)
 	/*
 	 * For P1 and P2 space this is trivial, as everything is already
 	 * mapped. Uncached access for P1 addresses are done through P2.
@@ -274,6 +267,22 @@ __ioremap_mode(unsigned long offset, unsigned long size, unsigned long flags)
 		return (void __iomem *)P4SEGADDR(offset);
 #endif
 
+	return NULL;
+}
+
+static inline void __iomem *
+__ioremap_mode(unsigned long offset, unsigned long size, unsigned long flags)
+{
+	void __iomem *ret;
+
+	ret = __ioremap_trapped(offset, size);
+	if (ret)
+		return ret;
+
+	ret = __ioremap_29bit(offset, size, flags);
+	if (ret)
+		return ret;
+
 	return __ioremap(offset, size, flags);
 }
 #else