1 /*
2 * arch/sh/kernel/io.c - Machine independent I/O functions.
3 *
4 * Copyright (C) 2000 - 2009 Stuart Menefy
5 * Copyright (C) 2005 Paul Mundt
6 *
7 * This file is subject to the terms and conditions of the GNU General Public
8 * License. See the file "COPYING" in the main directory of this archive
9 * for more details.
10 */
11 #include <linux/module.h>
12 #include <linux/pci.h>
13 #include <asm/machvec.h>
14 #include <asm/io.h>
15
16 /*
17 * Copy data from IO memory space to "real" memory space.
18 */
memcpy_fromio(void * to,const volatile void __iomem * from,unsigned long count)19 void memcpy_fromio(void *to, const volatile void __iomem *from, unsigned long count)
20 {
21 /*
22 * Would it be worthwhile doing byte and long transfers first
23 * to try and get aligned?
24 */
25 #ifdef CONFIG_CPU_SH4
26 if ((count >= 0x20) &&
27 (((u32)to & 0x1f) == 0) && (((u32)from & 0x3) == 0)) {
28 int tmp2, tmp3, tmp4, tmp5, tmp6;
29
30 __asm__ __volatile__(
31 "1: \n\t"
32 "mov.l @%7+, r0 \n\t"
33 "mov.l @%7+, %2 \n\t"
34 "movca.l r0, @%0 \n\t"
35 "mov.l @%7+, %3 \n\t"
36 "mov.l @%7+, %4 \n\t"
37 "mov.l @%7+, %5 \n\t"
38 "mov.l @%7+, %6 \n\t"
39 "mov.l @%7+, r7 \n\t"
40 "mov.l @%7+, r0 \n\t"
41 "mov.l %2, @(0x04,%0) \n\t"
42 "mov #0x20, %2 \n\t"
43 "mov.l %3, @(0x08,%0) \n\t"
44 "sub %2, %1 \n\t"
45 "mov.l %4, @(0x0c,%0) \n\t"
46 "cmp/hi %1, %2 ! T if 32 > count \n\t"
47 "mov.l %5, @(0x10,%0) \n\t"
48 "mov.l %6, @(0x14,%0) \n\t"
49 "mov.l r7, @(0x18,%0) \n\t"
50 "mov.l r0, @(0x1c,%0) \n\t"
51 "bf.s 1b \n\t"
52 " add #0x20, %0 \n\t"
53 : "=&r" (to), "=&r" (count),
54 "=&r" (tmp2), "=&r" (tmp3), "=&r" (tmp4),
55 "=&r" (tmp5), "=&r" (tmp6), "=&r" (from)
56 : "7"(from), "0" (to), "1" (count)
57 : "r0", "r7", "t", "memory");
58 }
59 #endif
60
61 if ((((u32)to | (u32)from) & 0x3) == 0) {
62 for (; count > 3; count -= 4) {
63 *(u32 *)to = *(volatile u32 *)from;
64 to += 4;
65 from += 4;
66 }
67 }
68
69 for (; count > 0; count--) {
70 *(u8 *)to = *(volatile u8 *)from;
71 to++;
72 from++;
73 }
74
75 mb();
76 }
77 EXPORT_SYMBOL(memcpy_fromio);
78
79 /*
80 * Copy data from "real" memory space to IO memory space.
81 */
memcpy_toio(volatile void __iomem * to,const void * from,unsigned long count)82 void memcpy_toio(volatile void __iomem *to, const void *from, unsigned long count)
83 {
84 if ((((u32)to | (u32)from) & 0x3) == 0) {
85 for ( ; count > 3; count -= 4) {
86 *(volatile u32 *)to = *(u32 *)from;
87 to += 4;
88 from += 4;
89 }
90 }
91
92 for (; count > 0; count--) {
93 *(volatile u8 *)to = *(u8 *)from;
94 to++;
95 from++;
96 }
97
98 mb();
99 }
100 EXPORT_SYMBOL(memcpy_toio);
101
102 /*
103 * "memset" on IO memory space.
104 * This needs to be optimized.
105 */
memset_io(volatile void __iomem * dst,int c,unsigned long count)106 void memset_io(volatile void __iomem *dst, int c, unsigned long count)
107 {
108 while (count) {
109 count--;
110 writeb(c, dst);
111 dst++;
112 }
113 }
114 EXPORT_SYMBOL(memset_io);
115