io.h

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/*
 *  linux/include/asm-arm/io.h
 *
 *  Copyright (C) 1996-2000 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:
 *  16-Sep-1996	RMK	Inlined the inx/outx functions & optimised for both
 *			constant addresses and variable addresses.
 *  04-Dec-1997	RMK	Moved a lot of this stuff to the new architecture
 *			specific IO header files.
 *  27-Mar-1999	PJB	Second parameter of memcpy_toio is const..
 *  04-Apr-1999	PJB	Added check_signature.
 *  12-Dec-1999	RMK	More cleanups
 *  18-Jun-2000 RMK	Removed virt_to_* and friends definitions
 */
#ifndef __ASM_ARM_IO_H
#define __ASM_ARM_IO_H

#ifdef __KERNEL__

#include <linux/config.h>
#include <linux/types.h>
#include <asm/byteorder.h>
#include <asm/memory.h>
#include <asm/hardware.h>

/*
 * Generic IO read/write.  These perform native-endian accesses.  Note
 * that some architectures will want to re-define __raw_{read,write}w.
 */
extern void __raw_writesb(unsigned int addr, const void *data, int bytelen);
extern void __raw_writesw(unsigned int addr, const void *data, int wordlen);
extern void __raw_writesl(unsigned int addr, const void *data, int longlen);

extern void __raw_readsb(unsigned int addr, void *data, int bytelen);
extern void __raw_readsw(unsigned int addr, void *data, int wordlen);
extern void __raw_readsl(unsigned int addr, void *data, int longlen);

#define __raw_writeb(v,a)       (*(volatile unsigned char  *)(a) = (v))
#define __raw_writew(v,a)       (*(volatile unsigned short *)(a) = (v))
#define __raw_writel(v,a)       (*(volatile unsigned int   *)(a) = (v))

#define __raw_readb(a)          (*(volatile unsigned char  *)(a))
#define __raw_readw(a)          (*(volatile unsigned short *)(a))
#define __raw_readl(a)          (*(volatile unsigned int   *)(a))


/*
 * Bad read/write accesses...
 */
extern void __readwrite_bug(const char *fn);

/*
 * Now, pick up the machine-defined IO definitions
 */

#define IO_SPACE_LIMIT 0xffffffff

/*
 * GCC is totally crap at loading/storing data.  We try to persuade it
 * to do the right thing by using these whereever possible instead of
 * the above.
 */
#define __arch_base_getb(b,o)                   \
 ({                                             \
        unsigned int v, r = (b);                \
        __asm__ __volatile__(                   \
                "ldrb   %0, [%1, %2]"           \
                : "=r" (v)                      \
                : "r" (r), "Ir" (o));           \
        v;                                      \
 })

#define __arch_base_getl(b,o)                   \
 ({                                             \
        unsigned int v, r = (b);                \
        __asm__ __volatile__(                   \
                "ldr    %0, [%1, %2]"           \
                : "=r" (v)                      \
                : "r" (r), "Ir" (o));           \
        v;                                      \
 })

#define __arch_base_putb(v,b,o)                 \
 ({                                             \
        unsigned int r = (b);                   \
        __asm__ __volatile__(                   \
                "strb   %0, [%1, %2]"           \
                :                               \
                : "r" (v), "r" (r), "Ir" (o));  \
 })

#define __arch_base_putl(v,b,o)                 \
 ({                                             \
        unsigned int r = (b);                   \
        __asm__ __volatile__(                   \
                "str    %0, [%1, %2]"           \
                :                               \
                : "r" (v), "r" (r), "Ir" (o));  \
 })

/*
 * 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 - let the compiler
 * optimize the expressions
 */
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 unsigned int __ioaddr (unsigned int port)                 \
{                                                                               \
        if (__PORT_PCIO(port))                                                  \
                return (unsigned int)(PCIO_BASE + (port << 2));                 \
        else                                                                    \
                return (unsigned int)(IO_BASE + (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)))                                                \