linux/include/asm-avr32/arch-at32ap/io.h
Haavard Skinnemoen e3e7d8d4ea [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>
2007-04-27 13:44:14 +02:00

40 lines
1.2 KiB
C

#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 */