// SPDX-License-Identifier: GPL-2.0
/*
 * arch/sh/kernel/io.c - Machine independent I/O functions.
 *
 * Copyright (C) 2000 - 2009  Stuart Menefy
 * Copyright (C) 2005  Paul Mundt
 */
#include <linux/module.h>
#include <linux/pci.h>
#include <asm/machvec.h>
#include <asm/io.h>

/*
 * Copy data from IO memory space to "real" memory space.
 */
void memcpy_fromio(void *to, const volatile void __iomem *from, unsigned long count)
{
        /*
         * Would it be worthwhile doing byte and long transfers first
         * to try and get aligned?
         */
#ifdef CONFIG_CPU_SH4
        if ((count >= 0x20) &&
             (((u32)to & 0x1f) == 0) && (((u32)from & 0x3) == 0)) {
                int tmp2, tmp3, tmp4, tmp5, tmp6;

                __asm__ __volatile__(
                        "1:                     \n\t"
                        "mov.l  @%7+, r0        \n\t"
                        "mov.l  @%7+, %2        \n\t"
                        "movca.l r0, @%0        \n\t"
                        "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       \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 > count       \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" (to), "=&r" (count),
                          "=&r" (tmp2), "=&r" (tmp3), "=&r" (tmp4),
                          "=&r" (tmp5), "=&r" (tmp6), "=&r" (from)
                        : "7"(from), "0" (to), "1" (count)
                        : "r0", "r7", "t", "memory");
        }
#endif

        if ((((u32)to | (u32)from) & 0x3) == 0) {
                for (; count > 3; count -= 4) {
                        *(u32 *)to = *(volatile u32 *)from;
                        to += 4;
                        from += 4;
                }
        }

        for (; count > 0; count--) {
                *(u8 *)to = *(volatile u8 *)from;
                to++;
                from++;
        }

        mb();
}
EXPORT_SYMBOL(memcpy_fromio);

/*
 * Copy data from "real" memory space to IO memory space.
 */
void memcpy_toio(volatile void __iomem *to, const void *from, unsigned long count)
{
        if ((((u32)to | (u32)from) & 0x3) == 0) {
                for ( ; count > 3; count -= 4) {
                        *(volatile u32 *)to = *(u32 *)from;
                        to += 4;
                        from += 4;
                }
        }

        for (; count > 0; count--) {
                *(volatile u8 *)to = *(u8 *)from;
                to++;
                from++;
        }

        mb();
}
EXPORT_SYMBOL(memcpy_toio);

/*
 * "memset" on IO memory space.
 * This needs to be optimized.
 */
void memset_io(volatile void __iomem *dst, int c, unsigned long count)
{
        while (count) {
                count--;
                writeb(c, dst);
                dst++;
        }
}
EXPORT_SYMBOL(memset_io);