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io.c

/*
 * linux/arch/sh/kernel/io.c
 *
 * 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 <asm/machvec.h>
#include <asm/io.h>

/*
 * Copy data from IO memory space to "real" memory space.
 * This needs to be optimized.
 */
void memcpy_fromio(void *to, volatile void __iomem *from, unsigned long count)
{
      char *p = to;
        while (count) {
                count--;
                *p = readb((void __iomem *)from);
                p++;
                from++;
        }
}
EXPORT_SYMBOL(memcpy_fromio);

/*
 * Copy data from "real" memory space to IO memory space.
 * This needs to be optimized.
 */
void memcpy_toio(volatile void __iomem *to, const void *from, unsigned long count)
{
      const char *p = from;
        while (count) {
                count--;
                writeb(*p, (void __iomem *)to);
                p++;
                to++;
        }
}
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, (void __iomem *)dst);
                dst++;
        }
}
EXPORT_SYMBOL(memset_io);

void __raw_readsl(unsigned long addr, void *datap, int len)
{
      u32 *data;

      for (data = datap; (len != 0) && (((u32)data & 0x1f) != 0); len--)
            *data++ = ctrl_inl(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++ = ctrl_inl(addr);
}
EXPORT_SYMBOL(__raw_readsl);

void __raw_writesl(unsigned long 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);

void __iomem *ioport_map(unsigned long port, unsigned int nr)
{
      return sh_mv.mv_ioport_map(port, nr);
}
EXPORT_SYMBOL(ioport_map);

void ioport_unmap(void __iomem *addr)
{
      sh_mv.mv_ioport_unmap(addr);
}
EXPORT_SYMBOL(ioport_unmap);

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