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io.h

/*
 *  arch/arm/mach-rpc/include/mach/io.h
 *
 *  Copyright (C) 1997 Russell King
 *
 * 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.
 *
 * Modifications:
 *  06-Dec-1997   RMK   Created.
 */
#ifndef __ASM_ARM_ARCH_IO_H
#define __ASM_ARM_ARCH_IO_H

#include <mach/hardware.h>

#define IO_SPACE_LIMIT 0xffffffff

/*
 * We use two different types of addressing - PC style addresses, and ARM
 * addresses.  PC style accesses the PC hardware with the normal PC IO
 * addresses, eg 0x3f8 for serial#1.  ARM addresses are 0x80000000+
 * and are translated to the start of IO.  Note that all addresses are
 * shifted left!
 */
#define __PORT_PCIO(x)  (!((x) & 0x80000000))

/*
 * Dynamic IO functions.
 */
static inline void __outb (unsigned int value, unsigned int port)
{
      unsigned long temp;
      __asm__ __volatile__(
      "tst  %2, #0x80000000\n\t"
      "mov  %0, %4\n\t"
      "addeq      %0, %0, %3\n\t"
      "strb %1, [%0, %2, lsl #2]    @ outb"
      : "=&r" (temp)
      : "r" (value), "r" (port), "Ir" (PCIO_BASE - IO_BASE), "Ir" (IO_BASE)
      : "cc");
}

static inline void __outw (unsigned int value, unsigned int port)
{
      unsigned long temp;
      __asm__ __volatile__(
      "tst  %2, #0x80000000\n\t"
      "mov  %0, %4\n\t"
      "addeq      %0, %0, %3\n\t"
      "str  %1, [%0, %2, lsl #2]    @ outw"
      : "=&r" (temp)
      : "r" (value|value<<16), "r" (port), "Ir" (PCIO_BASE - IO_BASE), "Ir" (IO_BASE)
      : "cc");
}

static inline void __outl (unsigned int value, unsigned int port)
{
      unsigned long temp;
      __asm__ __volatile__(
      "tst  %2, #0x80000000\n\t"
      "mov  %0, %4\n\t"
      "addeq      %0, %0, %3\n\t"
      "str  %1, [%0, %2, lsl #2]    @ outl"
      : "=&r" (temp)
      : "r" (value), "r" (port), "Ir" (PCIO_BASE - IO_BASE), "Ir" (IO_BASE)
      : "cc");
}

#define DECLARE_DYN_IN(sz,fnsuffix,instr)                         \
static inline unsigned sz __in##fnsuffix (unsigned int port)            \
{                                                           \
      unsigned long temp, value;                                  \
      __asm__ __volatile__(                                       \
      "tst  %2, #0x80000000\n\t"                                  \
      "mov  %0, %4\n\t"                                     \
      "addeq      %0, %0, %3\n\t"                                       \
      "ldr" instr "     %1, [%0, %2, lsl #2]    @ in" #fnsuffix               \
      : "=&r" (temp), "=r" (value)                                \
      : "r" (port), "Ir" (PCIO_BASE - IO_BASE), "Ir" (IO_BASE)          \
      : "cc");                                              \
      return (unsigned sz)value;                                  \
}

static inline void __iomem *__deprecated __ioaddr(unsigned int port)
{
      void __iomem *ret;
      if (__PORT_PCIO(port))
            ret = PCIO_BASE;
      else
            ret = IO_BASE;
      return ret + (port << 2);
}

#define DECLARE_IO(sz,fnsuffix,instr)     \
      DECLARE_DYN_IN(sz,fnsuffix,instr)

DECLARE_IO(char,b,"b")
DECLARE_IO(short,w,"")
DECLARE_IO(int,l,"")

#undef DECLARE_IO
#undef DECLARE_DYN_IN

/*
 * Constant address IO functions
 *
 * These have to be macros for the 'J' constraint to work -
 * +/-4096 immediate operand.
 */
#define __outbc(value,port)                                       \
({                                                          \
      if (__PORT_PCIO((port)))                                    \
            __asm__ __volatile__(                                 \
            "strb %0, [%1, %2]      @ outbc"                      \
            : : "r" (value), "r" (PCIO_BASE), "Jr" ((port) << 2));            \
      else                                                  \
            __asm__ __volatile__(                                 \
            "strb %0, [%1, %2]      @ outbc"                      \
            : : "r" (value), "r" (IO_BASE), "r" ((port) << 2));         \
})

#define __inbc(port)                                              \
({                                                          \
      unsigned char result;                                       \
      if (__PORT_PCIO((port)))                                    \
            __asm__ __volatile__(                                 \
            "ldrb %0, [%1, %2]      @ inbc"                             \
            : "=r" (result) : "r" (PCIO_BASE), "Jr" ((port) << 2));           \
      else                                                  \
            __asm__ __volatile__(                                 \
            "ldrb %0, [%1, %2]      @ inbc"                             \
            : "=r" (result) : "r" (IO_BASE), "r" ((port) << 2));        \
      result;                                                     \
})

#define __outwc(value,port)                                       \
({                                                          \
      unsigned long __v = value;                                  \
      if (__PORT_PCIO((port)))                                    \
            __asm__ __volatile__(                                 \
            "str  %0, [%1, %2]      @ outwc"                      \
            : : "r" (__v|__v<<16), "r" (PCIO_BASE), "Jr" ((port) << 2));      \
      else                                                  \
            __asm__ __volatile__(                                 \
            "str  %0, [%1, %2]      @ outwc"                      \
            : : "r" (__v|__v<<16), "r" (IO_BASE), "r" ((port) << 2));         \
})

#define __inwc(port)                                              \
({                                                          \
      unsigned short result;                                      \
      if (__PORT_PCIO((port)))                                    \
            __asm__ __volatile__(                                 \
            "ldr  %0, [%1, %2]      @ inwc"                             \
            : "=r" (result) : "r" (PCIO_BASE), "Jr" ((port) << 2));           \
      else                                                  \
            __asm__ __volatile__(                                 \
            "ldr  %0, [%1, %2]      @ inwc"                             \
            : "=r" (result) : "r" (IO_BASE), "r" ((port) << 2));        \
      result & 0xffff;                                      \
})

#define __outlc(value,port)                                       \
({                                                          \
      unsigned long __v = value;                                  \
      if (__PORT_PCIO((port)))                                    \
            __asm__ __volatile__(                                 \
            "str  %0, [%1, %2]      @ outlc"                      \
            : : "r" (__v), "r" (PCIO_BASE), "Jr" ((port) << 2));        \
      else                                                  \
            __asm__ __volatile__(                                 \
            "str  %0, [%1, %2]      @ outlc"                      \
            : : "r" (__v), "r" (IO_BASE), "r" ((port) << 2));           \
})

#define __inlc(port)                                              \
({                                                          \
      unsigned long result;                                       \
      if (__PORT_PCIO((port)))                                    \
            __asm__ __volatile__(                                 \
            "ldr  %0, [%1, %2]      @ inlc"                             \
            : "=r" (result) : "r" (PCIO_BASE), "Jr" ((port) << 2));           \
      else                                                  \
            __asm__ __volatile__(                                 \
            "ldr  %0, [%1, %2]      @ inlc"                             \
            : "=r" (result) : "r" (IO_BASE), "r" ((port) << 2));        \
      result;                                                     \
})

#define inb(p)          (__builtin_constant_p((p)) ? __inbc(p)    : __inb(p))
#define inw(p)          (__builtin_constant_p((p)) ? __inwc(p)    : __inw(p))
#define inl(p)          (__builtin_constant_p((p)) ? __inlc(p)    : __inl(p))
#define outb(v,p) (__builtin_constant_p((p)) ? __outbc(v,p) : __outb(v,p))
#define outw(v,p) (__builtin_constant_p((p)) ? __outwc(v,p) : __outw(v,p))
#define outl(v,p) (__builtin_constant_p((p)) ? __outlc(v,p) : __outl(v,p))

/* the following macro is deprecated */
#define ioaddr(port)    ((unsigned long)__ioaddr((port)))

#define insb(p,d,l)     __raw_readsb(__ioaddr(p),d,l)
#define insw(p,d,l)     __raw_readsw(__ioaddr(p),d,l)

#define outsb(p,d,l)    __raw_writesb(__ioaddr(p),d,l)
#define outsw(p,d,l)    __raw_writesw(__ioaddr(p),d,l)

/*
 * 1:1 mapping for ioremapped regions.
 */
#define __mem_pci(x)    (x)

#endif

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