[AVR32] Make I/O access macros work with external devices

Fix the I/O access macros so that they work with externally connected
devices accessed in little-endian mode over any bus width:

* Use a set of macros to define I/O port- and memory operations
  borrowed from MIPS.
* Allow subarchitecture to specify address- and data-mangling
* Implement at32ap-specific port mangling (with build-time
  configurable bus width. Only one bus width at a time supported
  for now.)
* Rewrite iowriteN and friends to use write[bwl] and friends
  (not the __raw counterparts.)

This has been tested using pata_pcmcia to access a CompactFlash card
connected to the EBI (16-bit bus width.)

Signed-off-by: Haavard Skinnemoen <hskinnemoen@atmel.com>

1 files changed, 39 insertions, 0 deletions

diff --git a/include/asm-avr32/arch-at32ap/io.h b/include/asm-avr32/arch-at32ap/io.h
new file mode 100644
index 000000000000..ee59e401f041
--- /dev/null
+++ b/include/asm-avr32/arch-at32ap/io.h
@@ -0,0 +1,39 @@
+#ifndef __ASM_AVR32_ARCH_AT32AP_IO_H
+#define __ASM_AVR32_ARCH_AT32AP_IO_H
+
+/* For "bizarre" halfword swapping */
+#include <linux/byteorder/swabb.h>
+
+#if defined(CONFIG_AP7000_32_BIT_SMC)
+# define __swizzle_addr_b(addr) (addr ^ 3UL)
+# define __swizzle_addr_w(addr) (addr ^ 2UL)
+# define __swizzle_addr_l(addr) (addr)
+# define ioswabb(a, x)          (x)
+# define ioswabw(a, x)          (x)
+# define ioswabl(a, x)          (x)
+# define __mem_ioswabb(a, x)    (x)
+# define __mem_ioswabw(a, x)    swab16(x)
+# define __mem_ioswabl(a, x)    swab32(x)
+#elif defined(CONFIG_AP7000_16_BIT_SMC)
+# define __swizzle_addr_b(addr) (addr ^ 1UL)
+# define __swizzle_addr_w(addr) (addr)
+# define __swizzle_addr_l(addr) (addr)
+# define ioswabb(a, x)          (x)
+# define ioswabw(a, x)          (x)
+# define ioswabl(a, x)          swahw32(x)
+# define __mem_ioswabb(a, x)    (x)
+# define __mem_ioswabw(a, x)    swab16(x)
+# define __mem_ioswabl(a, x)    swahb32(x)
+#else
+# define __swizzle_addr_b(addr) (addr)
+# define __swizzle_addr_w(addr) (addr)
+# define __swizzle_addr_l(addr) (addr)
+# define ioswabb(a, x)          (x)
+# define ioswabw(a, x)          swab16(x)
+# define ioswabl(a, x)          swab32(x)
+# define __mem_ioswabb(a, x)    (x)
+# define __mem_ioswabw(a, x)    (x)
+# define __mem_ioswabl(a, x)    (x)
+#endif
+
+#endif /* __ASM_AVR32_ARCH_AT32AP_IO_H */