05ae915851
Implement optimized copies of readsl()/writesl(). Signed-off-by: Paul Mundt <lethal@linux-sh.org>
141 lines
3.3 KiB
C
141 lines
3.3 KiB
C
/*
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* linux/arch/sh/kernel/io.c
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*
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* Copyright (C) 2000 Stuart Menefy
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* Copyright (C) 2005 Paul Mundt
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*
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* Provide real functions which expand to whatever the header file defined.
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* Also definitions of machine independent IO functions.
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*/
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#include <linux/module.h>
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#include <asm/machvec.h>
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#include <asm/io.h>
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/*
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* Copy data from IO memory space to "real" memory space.
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* This needs to be optimized.
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*/
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void memcpy_fromio(void *to, volatile void __iomem *from, unsigned long count)
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{
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char *p = to;
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while (count) {
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count--;
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*p = readb((void __iomem *)from);
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p++;
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from++;
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}
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}
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EXPORT_SYMBOL(memcpy_fromio);
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/*
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* Copy data from "real" memory space to IO memory space.
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* This needs to be optimized.
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*/
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void memcpy_toio(volatile void __iomem *to, const void *from, unsigned long count)
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{
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const char *p = from;
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while (count) {
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count--;
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writeb(*p, (void __iomem *)to);
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p++;
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to++;
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}
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}
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EXPORT_SYMBOL(memcpy_toio);
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/*
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* "memset" on IO memory space.
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* This needs to be optimized.
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*/
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void memset_io(volatile void __iomem *dst, int c, unsigned long count)
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{
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while (count) {
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count--;
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writeb(c, (void __iomem *)dst);
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dst++;
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}
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}
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EXPORT_SYMBOL(memset_io);
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void __raw_readsl(unsigned long addr, void *datap, int len)
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{
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u32 *data;
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for (data = datap; (len != 0) && (((u32)data & 0x1f) != 0); len--)
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*data++ = ctrl_inl(addr);
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if (likely(len >= (0x20 >> 2))) {
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int tmp2, tmp3, tmp4, tmp5, tmp6;
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__asm__ __volatile__(
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"1: \n\t"
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"mov.l @%7, r0 \n\t"
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"mov.l @%7, %2 \n\t"
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#ifdef CONFIG_CPU_SH4
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"movca.l r0, @%0 \n\t"
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#else
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"mov.l r0, @%0 \n\t"
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#endif
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"mov.l @%7, %3 \n\t"
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"mov.l @%7, %4 \n\t"
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"mov.l @%7, %5 \n\t"
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"mov.l @%7, %6 \n\t"
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"mov.l @%7, r7 \n\t"
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"mov.l @%7, r0 \n\t"
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"mov.l %2, @(0x04,%0) \n\t"
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"mov #0x20>>2, %2 \n\t"
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"mov.l %3, @(0x08,%0) \n\t"
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"sub %2, %1 \n\t"
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"mov.l %4, @(0x0c,%0) \n\t"
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"cmp/hi %1, %2 ! T if 32 > len \n\t"
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"mov.l %5, @(0x10,%0) \n\t"
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"mov.l %6, @(0x14,%0) \n\t"
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"mov.l r7, @(0x18,%0) \n\t"
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"mov.l r0, @(0x1c,%0) \n\t"
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"bf.s 1b \n\t"
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" add #0x20, %0 \n\t"
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: "=&r" (data), "=&r" (len),
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"=&r" (tmp2), "=&r" (tmp3), "=&r" (tmp4),
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"=&r" (tmp5), "=&r" (tmp6)
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: "r"(addr), "0" (data), "1" (len)
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: "r0", "r7", "t", "memory");
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}
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for (; len != 0; len--)
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*data++ = ctrl_inl(addr);
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}
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EXPORT_SYMBOL(__raw_readsl);
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void __raw_writesl(unsigned long addr, const void *data, int len)
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{
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if (likely(len != 0)) {
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int tmp1;
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__asm__ __volatile__ (
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"1: \n\t"
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"mov.l @%0+, %1 \n\t"
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"dt %3 \n\t"
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"bf.s 1b \n\t"
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" mov.l %1, @%4 \n\t"
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: "=&r" (data), "=&r" (tmp1)
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: "0" (data), "r" (len), "r"(addr)
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: "t", "memory");
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}
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}
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EXPORT_SYMBOL(__raw_writesl);
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void __iomem *ioport_map(unsigned long port, unsigned int nr)
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{
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return sh_mv.mv_ioport_map(port, nr);
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}
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EXPORT_SYMBOL(ioport_map);
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void ioport_unmap(void __iomem *addr)
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{
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sh_mv.mv_ioport_unmap(addr);
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}
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EXPORT_SYMBOL(ioport_unmap);
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