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Source at commit 0de2b2b3be81048189a32f7a3d3ba0ba9ec817b6 created 11 years 11 months ago. By Maarten ter Huurne, MIPS: JZ4740: Fixed value for round robin constant. | |
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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 | */ |
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 | */ |
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 | */ |
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 |
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