1/*
2 * Copyright (C) 2006 - 2008 Lemote Inc. & Institute of Computing Technology
3 * Author: Yanhua, yanh@lemote.com
4 *
5 * This file is subject to the terms and conditions of the GNU General Public
6 * License.  See the file "COPYING" in the main directory of this archive
7 * for more details.
8 */
9#include <linux/cpufreq.h>
10#include <linux/errno.h>
11#include <linux/export.h>
12
13#include <asm/mach-loongson2ef/loongson.h>
14
15enum {
16	DC_ZERO, DC_25PT = 2, DC_37PT, DC_50PT, DC_62PT, DC_75PT,
17	DC_87PT, DC_DISABLE, DC_RESV
18};
19
20struct cpufreq_frequency_table loongson2_clockmod_table[] = {
21	{0, DC_RESV, CPUFREQ_ENTRY_INVALID},
22	{0, DC_ZERO, CPUFREQ_ENTRY_INVALID},
23	{0, DC_25PT, 0},
24	{0, DC_37PT, 0},
25	{0, DC_50PT, 0},
26	{0, DC_62PT, 0},
27	{0, DC_75PT, 0},
28	{0, DC_87PT, 0},
29	{0, DC_DISABLE, 0},
30	{0, DC_RESV, CPUFREQ_TABLE_END},
31};
32EXPORT_SYMBOL_GPL(loongson2_clockmod_table);
33
34int loongson2_cpu_set_rate(unsigned long rate_khz)
35{
36	struct cpufreq_frequency_table *pos;
37	int regval;
38
39	cpufreq_for_each_valid_entry(pos, loongson2_clockmod_table)
40		if (rate_khz == pos->frequency)
41			break;
42	if (rate_khz != pos->frequency)
43		return -ENOTSUPP;
44
45	regval = readl(LOONGSON_CHIPCFG);
46	regval = (regval & ~0x7) | (pos->driver_data - 1);
47	writel(regval, LOONGSON_CHIPCFG);
48
49	return 0;
50}
51EXPORT_SYMBOL_GPL(loongson2_cpu_set_rate);
52