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/*
* Copyright (C) 2006 - 2008 Lemote Inc. & Institute of Computing Technology
* Author: Yanhua, yanh@lemote.com
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*/
#include <linux/cpufreq.h>
#include <linux/errno.h>
#include <linux/export.h>
#include <asm/mach-loongson2ef/loongson.h>
enum {
DC_ZERO, DC_25PT = 2, DC_37PT, DC_50PT, DC_62PT, DC_75PT,
DC_87PT, DC_DISABLE, DC_RESV
};
struct cpufreq_frequency_table loongson2_clockmod_table[] = {
{0, DC_RESV, CPUFREQ_ENTRY_INVALID},
{0, DC_ZERO, CPUFREQ_ENTRY_INVALID},
{0, DC_25PT, 0},
{0, DC_37PT, 0},
{0, DC_50PT, 0},
{0, DC_62PT, 0},
{0, DC_75PT, 0},
{0, DC_87PT, 0},
{0, DC_DISABLE, 0},
{0, DC_RESV, CPUFREQ_TABLE_END},
};
EXPORT_SYMBOL_GPL(loongson2_clockmod_table);
int loongson2_cpu_set_rate(unsigned long rate_khz)
{
struct cpufreq_frequency_table *pos;
int regval;
cpufreq_for_each_valid_entry(pos, loongson2_clockmod_table)
if (rate_khz == pos->frequency)
break;
if (rate_khz != pos->frequency)
return -ENOTSUPP;
regval = readl(LOONGSON_CHIPCFG);
regval = (regval & ~0x7) | (pos->driver_data - 1);
writel(regval, LOONGSON_CHIPCFG);
return 0;
}
EXPORT_SYMBOL_GPL(loongson2_cpu_set_rate);
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