linux/drivers/cpufreq/spear-cpufreq.c

/*
 * drivers/cpufreq/spear-cpufreq.c
 *
 * CPU Frequency Scaling for SPEAr platform
 *
 * Copyright (C) 2012 ST Microelectronics
 * Deepak Sikri <[email protected]>
 *
 * This file is licensed under the terms of the GNU General Public
 * License version 2. This program is licensed "as is" without any
 * warranty of any kind, whether express or implied.
 */

#define pr_fmt(fmt) …

#include <linux/clk.h>
#include <linux/cpufreq.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/types.h>

/* SPEAr CPUFreq driver data structure */
static struct { … } spear_cpufreq;

static struct clk *spear1340_cpu_get_possible_parent(unsigned long newfreq)
{ … }

/*
 * In SPEAr1340, we cannot use newfreq directly because we need to actually
 * access a source clock (clk) which might not be ancestor of cpu at present.
 * Hence in SPEAr1340 we would operate on source clock directly before switching
 * cpu clock to it.
 */
static int spear1340_set_cpu_rate(struct clk *sys_pclk, unsigned long newfreq)
{ … }

static int spear_cpufreq_target(struct cpufreq_policy *policy,
		unsigned int index)
{ … }

static int spear_cpufreq_init(struct cpufreq_policy *policy)
{ … }

static struct cpufreq_driver spear_cpufreq_driver = …;

static int spear_cpufreq_probe(struct platform_device *pdev)
{ … }

static struct platform_driver spear_cpufreq_platdrv = …;
module_platform_driver(…) …;

MODULE_AUTHOR(…) …;
MODULE_DESCRIPTION(…) …;
MODULE_LICENSE(…) …;