[PATCH v3 2/5] m68k: Fix writew(), writel(), readw(), readl() endianness for classic m68k

[Daniel Palmer]

In Linux these are meant to read a little-endian value and swap
to the CPU endian.

In u-boot for m68k this is currently broken and prevents
virtio-mmio from functioning.

This change is only for classic m68k. Coldfire has read big-endian,
no swap for these in u-boot and Linux and existing drivers probably
depend on this.

Signed-off-by: Daniel Palmer <daniel at thingy.jp>
---
 arch/m68k/include/asm/io.h | 31 ++++++++++++++++++++-----------
 1 file changed, 20 insertions(+), 11 deletions(-)

diff --git a/arch/m68k/include/asm/io.h b/arch/m68k/include/asm/io.h
index 35ad4a1c0444..2577081d8363 100644
--- a/arch/m68k/include/asm/io.h
+++ b/arch/m68k/include/asm/io.h
@@ -23,18 +23,27 @@
 #define __raw_writew(w,addr) ((*(volatile u16 *) (addr)) = (w))
 #define __raw_writel(l,addr) ((*(volatile u32 *) (addr)) = (l))
 
-#define readb(addr)		in_8((volatile u8 *)(addr))
-#define writeb(b,addr)		out_8((volatile u8 *)(addr), (b))
-#if !defined(__BIG_ENDIAN)
-#define readw(addr)		(*(volatile u16 *) (addr))
-#define readl(addr)		(*(volatile u32 *) (addr))
-#define writew(b,addr)		((*(volatile u16 *) (addr)) = (b))
-#define writel(b,addr)		((*(volatile u32 *) (addr)) = (b))
+#define readb(addr)	in_8((volatile u8 *)(addr))
+#define writeb(b, addr)	out_8((volatile u8 *)(addr), (b))
+#ifdef CONFIG_M680x0
+/*
+ * For classic m68k these work the same way as Linux:
+ * Read a little endian value, swap to the CPU endian.
+ */
+#define readw(addr)	in_le16((volatile u16 *)(addr))
+#define readl(addr)	in_le32((volatile u32 *)(addr))
+#define writew(b, addr)	out_le16((volatile u16 *)(addr), (b))
+#define writel(b, addr)	out_le32((volatile u32 *)(addr), (b))
 #else
-#define readw(addr)		in_be16((volatile u16 *)(addr))
-#define readl(addr)		in_be32((volatile u32 *)(addr))
-#define writew(b,addr)		out_be16((volatile u16 *)(addr),(b))
-#define writel(b,addr)		out_be32((volatile u32 *)(addr),(b))
+/*
+ * For coldfire these read a big endian value and use it
+ * as-is. This means that for little endian devices on the
+ * bus like PCI device these won't work as expected currently.
+ */
+#define readw(addr)	in_be16((volatile u16 *)(addr))
+#define readl(addr)	in_be32((volatile u32 *)(addr))
+#define writew(b, addr)	out_be16((volatile u16 *)(addr), (b))
+#define writel(b, addr)	out_be32((volatile u32 *)(addr), (b))
 #endif
 
 /*
-- 
2.51.0