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e3e7d8d4ea
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>
40 lines
1.2 KiB
C
40 lines
1.2 KiB
C
#ifndef __ASM_AVR32_ARCH_AT32AP_IO_H
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#define __ASM_AVR32_ARCH_AT32AP_IO_H
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/* For "bizarre" halfword swapping */
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#include <linux/byteorder/swabb.h>
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#if defined(CONFIG_AP7000_32_BIT_SMC)
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# define __swizzle_addr_b(addr) (addr ^ 3UL)
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# define __swizzle_addr_w(addr) (addr ^ 2UL)
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# define __swizzle_addr_l(addr) (addr)
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# define ioswabb(a, x) (x)
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# define ioswabw(a, x) (x)
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# define ioswabl(a, x) (x)
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# define __mem_ioswabb(a, x) (x)
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# define __mem_ioswabw(a, x) swab16(x)
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# define __mem_ioswabl(a, x) swab32(x)
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#elif defined(CONFIG_AP7000_16_BIT_SMC)
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# define __swizzle_addr_b(addr) (addr ^ 1UL)
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# define __swizzle_addr_w(addr) (addr)
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# define __swizzle_addr_l(addr) (addr)
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# define ioswabb(a, x) (x)
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# define ioswabw(a, x) (x)
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# define ioswabl(a, x) swahw32(x)
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# define __mem_ioswabb(a, x) (x)
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# define __mem_ioswabw(a, x) swab16(x)
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# define __mem_ioswabl(a, x) swahb32(x)
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#else
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# define __swizzle_addr_b(addr) (addr)
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# define __swizzle_addr_w(addr) (addr)
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# define __swizzle_addr_l(addr) (addr)
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# define ioswabb(a, x) (x)
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# define ioswabw(a, x) swab16(x)
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# define ioswabl(a, x) swab32(x)
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# define __mem_ioswabb(a, x) (x)
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# define __mem_ioswabw(a, x) (x)
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# define __mem_ioswabl(a, x) (x)
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#endif
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#endif /* __ASM_AVR32_ARCH_AT32AP_IO_H */
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