mirror of https://github.com/Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
111 lines
2.4 KiB
111 lines
2.4 KiB
// 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);
|
|
|