/* * arch/sh/kernel/io.c - Machine independent I/O functions. * * Copyright (C) 2000 - 2009 Stuart Menefy * Copyright (C) 2005 Paul Mundt * * 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/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);