hardware.h
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上传日期:2009-04-28
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- /* include/asm-arm/arch-lh7a40x/hardware.h
- *
- * Copyright (C) 2004 Coastal Environmental Systems
- *
- * [ Substantially cribbed from include/asm-arm/arch-pxa/hardware.h ]
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * version 2 as published by the Free Software Foundation.
- *
- */
- #ifndef __ASM_ARCH_HARDWARE_H
- #define __ASM_ARCH_HARDWARE_H
- #define io_p2v(x) (0xf0000000 | (((x) & 0xfff00000) >> 4) | ((x) & 0x0000ffff))
- #define io_v2p(x) ( (((x) & 0x0fff0000) << 4) | ((x) & 0x0000ffff))
- #ifdef __ASSEMBLY__
- # define __REG(x) io_p2v(x)
- # define __PREG(x) io_v2p(x)
- #else
- # if 0
- # define __REG(x) (*((volatile u32 *)io_p2v(x)))
- # else
- /*
- * This __REG() version gives the same results as the one above, except
- * that we are fooling gcc somehow so it generates far better and smaller
- * assembly code for access to contigous registers. It's a shame that gcc
- * doesn't guess this by itself.
- */
- #include <asm/types.h>
- typedef struct { volatile u32 offset[4096]; } __regbase;
- # define __REGP(x) ((__regbase *)((x)&~4095))->offset[((x)&4095)>>2]
- # define __REG(x) __REGP(io_p2v(x))
- typedef struct { volatile u16 offset[4096]; } __regbase16;
- # define __REGP16(x) ((__regbase16 *)((x)&~4095))->offset[((x)&4095)>>1]
- # define __REG16(x) __REGP16(io_p2v(x))
- typedef struct { volatile u8 offset[4096]; } __regbase8;
- # define __REGP8(x) ((__regbase8 *)((x)&~4095))->offset[(x)&4095]
- # define __REG8(x) __REGP8(io_p2v(x))
- #endif
- /* Let's kick gcc's ass again... */
- # define __REG2(x,y)
- ( __builtin_constant_p(y) ? (__REG((x) + (y)))
- : (*(volatile u32 *)((u32)&__REG(x) + (y))) )
- # define __PREG(x) (io_v2p((u32)&(x)))
- #endif
- #include "registers.h"
- #endif /* _ASM_ARCH_HARDWARE_H */