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
17void 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
37u16 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
45u16 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
53u32 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
61u32 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