aboutsummaryrefslogtreecommitdiffstats
path: root/arch/sh/kernel/io.c
blob: 4770c241c6790192a4954d2274de144b8da5938a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
/*
 * arch/sh/kernel/io.c - Machine independent I/O functions.
 *
 * Copyright (C) 2000 - 2009  Stuart Menefy
 * Copyright (C) 2005  Paul Mundt
 *
 * 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 <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);

#ifndef CONFIG_GENERIC_IOMAP

void __iomem *ioport_map(unsigned long port, unsigned int nr)
{
	void __iomem *ret;

	ret = __ioport_map_trapped(port, nr);
	if (ret)
		return ret;

	return __ioport_map(port, nr);
}
EXPORT_SYMBOL(ioport_map);

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

#endif /* CONFIG_GENERIC_IOMAP */