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sh: Optimized readsl()/writesl() support. 

Implement optimized copies of readsl()/writesl().

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Paul Mundt 2006-09-27 18:25:24 +09:00
parent 2220d16493
commit 05ae915851
2 changed files with 73 additions and 0 deletions
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67
arch/sh/kernel/io.c
View File

@ -61,6 +61,73 @@ void memset_io(volatile void __iomem *dst, int c, unsigned long count)
}
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);

6
include/asm-sh/io.h
View File

@ -107,6 +107,9 @@
#define __raw_writew(v, a) __writew(v, (void __iomem *)(a))
#define __raw_writel(v, a) __writel(v, (void __iomem *)(a))
void __raw_writesl(unsigned long addr, const void *data, int longlen);
void __raw_readsl(unsigned long addr, void *data, int longlen);
/*
* The platform header files may define some of these macros to use
* the inlined versions where appropriate. These macros may also be
@ -132,6 +135,9 @@
# define writel(v,a) ({ __raw_writel((v),(a)); mb(); })
#endif
#define writesl __raw_writesl
#define readsl __raw_readsl
#define readb_relaxed(a) readb(a)
#define readw_relaxed(a) readw(a)
#define readl_relaxed(a) readl(a)