litmus-rt-pandaboard.git - LITMUS^RT and MC^2 V0 support for the pandaboard.

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author	Aaro Koskinen <aaro.koskinen@nokia.com>	2011-03-24 02:45:11 -0400
committer	Dmitry Torokhov <dmitry.torokhov@gmail.com>	2011-03-24 02:50:31 -0400
commit	903427955b9ffe1ca4b76c510089774c3b7a4a8a (patch)
tree	afa8c53b62bcf460203e6f9fd2648117b0443696 /lib/string_helpers.c
parent	ddca6a31345cbea8c7c907e6b7e016339cbb6342 (diff)

Input: tsc2005 - use relative jiffies to schedule the watchdog

Use relative jiffies to schedule the watchdog. Otherwise it will run like a mad one. Signed-off-by: Aaro Koskinen <aaro.koskinen@nokia.com> Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

Diffstat (limited to 'lib/string_helpers.c')

0 files changed, 0 insertions, 0 deletions

s Torvalds <torvalds@ppc970.osdl.org> 2005-04-16 18:20:36 -0400 Linux-2.6.12-rc2' href='/cgit/cgit.cgi/litmus-rt-ext-res.git/commit/arch/sh/kernel/cpufreq.c?id=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2'>1da177e4c3f4

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/*
 * cpufreq driver for the SuperH processors.
 *
 * Copyright (C) 2002 - 2012 Paul Mundt
 * Copyright (C) 2002 M. R. Brown
 *
 * Clock framework bits from arch/avr32/mach-at32ap/cpufreq.c
 *
 *   Copyright (C) 2004-2007 Atmel Corporation
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 */
#define pr_fmt(fmt) "cpufreq: " fmt

#include <linux/types.h>
#include <linux/cpufreq.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/err.h>
#include <linux/cpumask.h>
#include <linux/cpu.h>
#include <linux/smp.h>
#include <linux/sched.h>	/* set_cpus_allowed() */
#include <linux/clk.h>
#include <linux/percpu.h>
#include <linux/sh_clk.h>

static DEFINE_PER_CPU(struct clk, sh_cpuclk);

static unsigned int sh_cpufreq_get(unsigned int cpu)
{
	return (clk_get_rate(&per_cpu(sh_cpuclk, cpu)) + 500) / 1000;
}

/*
 * Here we notify other drivers of the proposed change and the final change.
 */
static int sh_cpufreq_target(struct cpufreq_policy *policy,
			     unsigned int target_freq,
			     unsigned int relation)
{
	unsigned int cpu = policy->cpu;
	struct clk *cpuclk = &per_cpu(sh_cpuclk, cpu);
	cpumask_t cpus_allowed;
	struct cpufreq_freqs freqs;
	struct device *dev;
	long freq;

	cpus_allowed = current->cpus_allowed;
	set_cpus_allowed_ptr(current, cpumask_of(cpu));

	BUG_ON(smp_processor_id() != cpu);

	dev = get_cpu_device(cpu);

	/* Convert target_freq from kHz to Hz */
	freq = clk_round_rate(cpuclk, target_freq * 1000);

	if (freq < (policy->min * 1000) || freq > (policy->max * 1000))
		return -EINVAL;

	dev_dbg(dev, "requested frequency %u Hz\n", target_freq * 1000);


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