1// SPDX-License-Identifier: GPL-2.0
2/*
3 * arch/sh/kernel/io.c - Machine independent I/O functions.
4 *
5 * Copyright (C) 2000 - 2009  Stuart Menefy
6 * Copyright (C) 2005  Paul Mundt
7 */
8#include <linux/module.h>
9#include <linux/pci.h>
10#include <asm/machvec.h>
11#include <asm/io.h>
12
13/*
14 * Copy data from IO memory space to "real" memory space.
15 */
16void memcpy_fromio(void *to, const volatile void __iomem *from, unsigned long count)
17{
18	/*
19	 * Would it be worthwhile doing byte and long transfers first
20	 * to try and get aligned?
21	 */
22#ifdef CONFIG_CPU_SH4
23	if ((count >= 0x20) &&
24	     (((u32)to & 0x1f) == 0) && (((u32)from & 0x3) == 0)) {
25		int tmp2, tmp3, tmp4, tmp5, tmp6;
26
27		__asm__ __volatile__(
28			"1:			\n\t"
29			"mov.l	@%7+, r0	\n\t"
30			"mov.l	@%7+, %2	\n\t"
31			"movca.l r0, @%0	\n\t"
32			"mov.l	@%7+, %3	\n\t"
33			"mov.l	@%7+, %4	\n\t"
34			"mov.l	@%7+, %5	\n\t"
35			"mov.l	@%7+, %6	\n\t"
36			"mov.l	@%7+, r7	\n\t"
37			"mov.l	@%7+, r0	\n\t"
38			"mov.l	%2, @(0x04,%0)	\n\t"
39			"mov	#0x20, %2	\n\t"
40			"mov.l	%3, @(0x08,%0)	\n\t"
41			"sub	%2, %1		\n\t"
42			"mov.l	%4, @(0x0c,%0)	\n\t"
43			"cmp/hi	%1, %2		! T if 32 > count	\n\t"
44			"mov.l	%5, @(0x10,%0)	\n\t"
45			"mov.l	%6, @(0x14,%0)	\n\t"
46			"mov.l	r7, @(0x18,%0)	\n\t"
47			"mov.l	r0, @(0x1c,%0)	\n\t"
48			"bf.s	1b		\n\t"
49			" add	#0x20, %0	\n\t"
50			: "=&r" (to), "=&r" (count),
51			  "=&r" (tmp2), "=&r" (tmp3), "=&r" (tmp4),
52			  "=&r" (tmp5), "=&r" (tmp6), "=&r" (from)
53			: "7"(from), "0" (to), "1" (count)
54			: "r0", "r7", "t", "memory");
55	}
56#endif
57
58	if ((((u32)to | (u32)from) & 0x3) == 0) {
59		for (; count > 3; count -= 4) {
60			*(u32 *)to = *(volatile u32 *)from;
61			to += 4;
62			from += 4;
63		}
64	}
65
66	for (; count > 0; count--) {
67		*(u8 *)to = *(volatile u8 *)from;
68		to++;
69		from++;
70	}
71
72	mb();
73}
74EXPORT_SYMBOL(memcpy_fromio);
75
76/*
77 * Copy data from "real" memory space to IO memory space.
78 */
79void memcpy_toio(volatile void __iomem *to, const void *from, unsigned long count)
80{
81	if ((((u32)to | (u32)from) & 0x3) == 0) {
82		for ( ; count > 3; count -= 4) {
83			*(volatile u32 *)to = *(u32 *)from;
84			to += 4;
85			from += 4;
86		}
87	}
88
89	for (; count > 0; count--) {
90		*(volatile u8 *)to = *(u8 *)from;
91		to++;
92		from++;
93	}
94
95	mb();
96}
97EXPORT_SYMBOL(memcpy_toio);
98
99/*
100 * "memset" on IO memory space.
101 * This needs to be optimized.
102 */
103void memset_io(volatile void __iomem *dst, int c, unsigned long count)
104{
105        while (count) {
106                count--;
107                writeb(c, dst);
108                dst++;
109        }
110}
111EXPORT_SYMBOL(memset_io);
112