io.c

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/*
 * arch/sh/lib/io.c - SH32 optimized I/O routines
 *
 * Copyright (C) 2000  Stuart Menefy
 * Copyright (C) 2005  Paul Mundt
 *
 * Provide real functions which expand to whatever the header file defined.
 * Also definitions of machine independent IO functions.
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 */
#include <linux/module.h>
#include <linux/io.h>

void __raw_readsl(const void __iomem *addr, void *datap, int len)
{
    u32 *data;

    for (data = datap; (len != 0) && (((u32)data & 0x1f) != 0); len--)
        *data++ = __raw_readl(addr);

    if (likely(len >= (0x20 >> 2))) {
        int tmp2, tmp3, tmp4, tmp5, tmp6;

        __asm__ __volatile__(
            "1:         \n\t"
            "mov.l  @%7, r0     \n\t"
            "mov.l  @%7, %2     \n\t"
#ifdef CONFIG_CPU_SH4
            "movca.l r0, @%0    \n\t"
#else
            "mov.l  r0, @%0     \n\t"
#endif
            "mov.l  @%7, %3     \n\t"
            "mov.l  @%7, %4     \n\t"
            "mov.l  @%7, %5     \n\t"
            "mov.l  @%7, %6     \n\t"
            "mov.l  @%7, r7     \n\t"
            "mov.l  @%7, r0     \n\t"
            "mov.l  %2, @(0x04,%0)  \n\t"
            "mov    #0x20>>2, %2    \n\t"
            "mov.l  %3, @(0x08,%0)  \n\t"
            "sub    %2, %1      \n\t"
            "mov.l  %4, @(0x0c,%0)  \n\t"
            "cmp/hi %1, %2      ! T if 32 > len \n\t"
            "mov.l  %5, @(0x10,%0)  \n\t"
            "mov.l  %6, @(0x14,%0)  \n\t"
            "mov.l  r7, @(0x18,%0)  \n\t"
            "mov.l  r0, @(0x1c,%0)  \n\t"
            "bf.s   1b      \n\t"
            " add   #0x20, %0   \n\t"
            : "=&r" (data), "=&r" (len),
              "=&r" (tmp2), "=&r" (tmp3), "=&r" (tmp4),
              "=&r" (tmp5), "=&r" (tmp6)
            : "r"(addr), "0" (data), "1" (len)
            : "r0", "r7", "t", "memory");
    }

    for (; len != 0; len--)
        *data++ = __raw_readl(addr);
}
EXPORT_SYMBOL(__raw_readsl);

void __raw_writesl(void __iomem *addr, const void *data, int len)
{
    if (likely(len != 0)) {
        int tmp1;

        __asm__ __volatile__ (
            "1:             \n\t"
            "mov.l  @%0+, %1    \n\t"
            "dt     %3      \n\t"
            "bf.s       1b      \n\t"
            " mov.l %1, @%4     \n\t"
            : "=&r" (data), "=&r" (tmp1)
            : "0" (data), "r" (len), "r"(addr)
            : "t", "memory");
    }
}
EXPORT_SYMBOL(__raw_writesl);