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