cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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clock.c (1311B)

      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);