f8ede0f700
Loongson 2F supports CPU clock scaling. When put it into wait mode by setting the frequency as ZERO it will stay in this mode until an external interrupt wakes the CPU again. To enable clock scaling support, an external timer of a known stable rate is required. Signed-off-by: Wu Zhangjin <wuzhangjin@gmail.com> Cc: linux-mips@linux-mips.org Cc: cpufreq@vger.kernel.org, Cc: Dave Jones <davej@redhat.com>, Cc: Dominik Brodowski <linux@dominikbrodowski.net>, Cc: yanh@lemote.com Cc: huhb@lemote.com, Patchwork: http://patchwork.linux-mips.org/patch/660/ Patchwork: http://patchwork.linux-mips.org/patch/751/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
31 lines
846 B
C
31 lines
846 B
C
/*
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* Copyright (C) 2009 Lemote Inc.
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* Author: Wu Zhangjin, wuzj@lemote.com
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*/
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#include <linux/err.h>
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#include <linux/platform_device.h>
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static struct platform_device loongson2_cpufreq_device = {
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.name = "loongson2_cpufreq",
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.id = -1,
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};
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static int __init loongson2_cpufreq_init(void)
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{
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struct cpuinfo_mips *c = ¤t_cpu_data;
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/* Only 2F revision and it's successors support CPUFreq */
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if ((c->processor_id & PRID_REV_MASK) >= PRID_REV_LOONGSON2F)
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return platform_device_register(&loongson2_cpufreq_device);
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return -ENODEV;
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}
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arch_initcall(loongson2_cpufreq_init);
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