1 /*
2 * Copyright (c) 2012 GCT Semiconductor, Inc. All rights reserved.
3 *
4 * This software is licensed under the terms of the GNU General Public
5 * License version 2, as published by the Free Software Foundation, and
6 * may be copied, distributed, and modified under those terms.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 */
13
14 #include <linux/slab.h>
15 #include "gdm_endian.h"
16
gdm_set_endian(struct gdm_endian * ed,u8 dev_endian)17 void gdm_set_endian(struct gdm_endian *ed, u8 dev_endian)
18 {
19 u8 a[2] = {0x12, 0x34};
20 u8 b[2] = {0, };
21 u16 c = 0x1234;
22
23 if (dev_endian == ENDIANNESS_BIG)
24 ed->dev_ed = ENDIANNESS_BIG;
25 else
26 ed->dev_ed = ENDIANNESS_LITTLE;
27
28 memcpy(b, &c, 2);
29
30 if (a[0] != b[0])
31 ed->host_ed = ENDIANNESS_LITTLE;
32 else
33 ed->host_ed = ENDIANNESS_BIG;
34
35 }
36
gdm_cpu_to_dev16(struct gdm_endian * ed,u16 x)37 u16 gdm_cpu_to_dev16(struct gdm_endian *ed, u16 x)
38 {
39 if (ed->dev_ed == ed->host_ed)
40 return x;
41
42 return Endian16_Swap(x);
43 }
44
gdm_dev16_to_cpu(struct gdm_endian * ed,u16 x)45 u16 gdm_dev16_to_cpu(struct gdm_endian *ed, u16 x)
46 {
47 if (ed->dev_ed == ed->host_ed)
48 return x;
49
50 return Endian16_Swap(x);
51 }
52
gdm_cpu_to_dev32(struct gdm_endian * ed,u32 x)53 u32 gdm_cpu_to_dev32(struct gdm_endian *ed, u32 x)
54 {
55 if (ed->dev_ed == ed->host_ed)
56 return x;
57
58 return Endian32_Swap(x);
59 }
60
gdm_dev32_to_cpu(struct gdm_endian * ed,u32 x)61 u32 gdm_dev32_to_cpu(struct gdm_endian *ed, u32 x)
62 {
63 if (ed->dev_ed == ed->host_ed)
64 return x;
65
66 return Endian32_Swap(x);
67 }
68