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 */
memcpy_fromio(void * to,const volatile void __iomem * from,unsigned long count)16 void 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 }
74 EXPORT_SYMBOL(memcpy_fromio);
75
76 /*
77 * Copy data from "real" memory space to IO memory space.
78 */
memcpy_toio(volatile void __iomem * to,const void * from,unsigned long count)79 void 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 }
97 EXPORT_SYMBOL(memcpy_toio);
98
99 /*
100 * "memset" on IO memory space.
101 * This needs to be optimized.
102 */
memset_io(volatile void __iomem * dst,int c,unsigned long count)103 void 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 }
111 EXPORT_SYMBOL(memset_io);
112