include/asm-arm/arch-lh7a40x/hardware.h

   1 /* include/asm-arm/arch-lh7a40x/hardware.h
   2  *
   3  *  Copyright (C) 2004 Coastal Environmental Systems
   4  *
   5  *  [ Substantially cribbed from include/asm-arm/arch-pxa/hardware.h ]
   6  *
   7  *  This program is free software; you can redistribute it and/or
   8  *  modify it under the terms of the GNU General Public License
   9  *  version 2 as published by the Free Software Foundation.
  10  *
  11  */
  12
  13 #ifndef __ASM_ARCH_HARDWARE_H
  14 #define __ASM_ARCH_HARDWARE_H
  15
  16 #define io_p2v(x) (0xf0000000 | (((x) & 0xfff00000) >> 4) | ((x) & 0x0000ffff))
  17 #define io_v2p(x) (             (((x) & 0x0fff0000) << 4) | ((x) & 0x0000ffff))
  18
  19 #ifdef __ASSEMBLY__
  20
  21 # define __REG(x)       io_p2v(x)
  22 # define __PREG(x)      io_v2p(x)
  23
  24 #else
  25
  26 # if 0
  27 #  define __REG(x)      (*((volatile u32 *)io_p2v(x)))
  28 # else
  29 /*
  30  * This __REG() version gives the same results as the one above,  except
  31  * that we are fooling gcc somehow so it generates far better and smaller
  32  * assembly code for access to contigous registers.  It's a shame that gcc
  33  * doesn't guess this by itself.
  34  */
  35 #include <asm/types.h>
  36 typedef struct { volatile u32 offset[4096]; } __regbase;
  37 # define __REGP(x)      ((__regbase *)((x)&~4095))->offset[((x)&4095)>>2]
  38 # define __REG(x)       __REGP(io_p2v(x))
  39 typedef struct { volatile u16 offset[4096]; } __regbase16;
  40 # define __REGP16(x)    ((__regbase16 *)((x)&~4095))->offset[((x)&4095)>>1]
  41 # define __REG16(x)     __REGP16(io_p2v(x))
  42 typedef struct { volatile u8 offset[4096]; } __regbase8;
  43 # define __REGP8(x)     ((__regbase8 *)((x)&~4095))->offset[(x)&4095]
  44 # define __REG8(x)      __REGP8(io_p2v(x))
  45 #endif
  46
  47 /* Let's kick gcc's ass again... */
  48 # define __REG2(x,y)    \
  49         ( __builtin_constant_p(y) ? (__REG((x) + (y))) \
  50                                   : (*(volatile u32 *)((u32)&__REG(x) + (y))) )
  51
  52 # define __PREG(x)      (io_v2p((u32)&(x)))
  53
  54 #endif
  55
  56 #include "registers.h"
  57
  58 #endif  /* _ASM_ARCH_HARDWARE_H */