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