cregit-Linux how code gets into the kernel

Release 4.14 drivers/cpufreq/unicore2-cpufreq.c

Directory: drivers/cpufreq
/*
 * clock scaling for the UniCore-II
 *
 * Code specific to PKUnity SoC and UniCore ISA
 *
 *      Maintained by GUAN Xue-tao <gxt@mprc.pku.edu.cn>
 *      Copyright (C) 2001-2010 Guan Xuetao
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/err.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/init.h>
#include <linux/clk.h>
#include <linux/cpufreq.h>

#include <mach/hardware.h>


static struct cpufreq_driver ucv2_driver;

/* make sure that only the "userspace" governor is run
 * -- anything else wouldn't make sense on this platform, anyway.
 */

static int ucv2_verify_speed(struct cpufreq_policy *policy) { if (policy->cpu) return -EINVAL; cpufreq_verify_within_cpu_limits(policy); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Guan Xuetao2793.10%133.33%
Jingoo Han13.45%133.33%
Viresh Kumar13.45%133.33%
Total29100.00%3100.00%


static int ucv2_target(struct cpufreq_policy *policy, unsigned int target_freq, unsigned int relation) { struct cpufreq_freqs freqs; int ret; freqs.old = policy->cur; freqs.new = target_freq; cpufreq_freq_transition_begin(policy, &freqs); ret = clk_set_rate(policy->clk, target_freq * 1000); cpufreq_freq_transition_end(policy, &freqs, ret); return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Guan Xuetao4459.46%116.67%
Viresh Kumar2939.19%466.67%
Chen Gang S11.35%116.67%
Total74100.00%6100.00%


static int __init ucv2_cpu_init(struct cpufreq_policy *policy) { if (policy->cpu != 0) return -EINVAL; policy->min = policy->cpuinfo.min_freq = 250000; policy->max = policy->cpuinfo.max_freq = 1000000; policy->clk = clk_get(NULL, "MAIN_CLK"); return PTR_ERR_OR_ZERO(policy->clk); }

Contributors

PersonTokensPropCommitsCommitProp
Guan Xuetao5074.63%133.33%
Viresh Kumar1623.88%133.33%
Duan Jiong11.49%133.33%
Total67100.00%3100.00%

static struct cpufreq_driver ucv2_driver = { .flags = CPUFREQ_STICKY | CPUFREQ_NO_AUTO_DYNAMIC_SWITCHING, .verify = ucv2_verify_speed, .target = ucv2_target, .get = cpufreq_generic_get, .init = ucv2_cpu_init, .name = "UniCore-II", };
static int __init ucv2_cpufreq_init(void) { return cpufreq_register_driver(&ucv2_driver); }

Contributors

PersonTokensPropCommitsCommitProp
Guan Xuetao16100.00%1100.00%
Total16100.00%1100.00%

arch_initcall(ucv2_cpufreq_init);

Overall Contributors

PersonTokensPropCommitsCommitProp
Guan Xuetao20278.29%19.09%
Viresh Kumar5320.54%763.64%
Chen Gang S10.39%19.09%
Jingoo Han10.39%19.09%
Duan Jiong10.39%19.09%
Total258100.00%11100.00%
Directory: drivers/cpufreq
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