linux/drivers/cpufreq/pxa2xx-cpufreq.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *  Copyright (C) 2002,2003 Intrinsyc Software
 *
 * History:
 *   31-Jul-2002 : Initial version [FB]
 *   29-Jan-2003 : added PXA255 support [FB]
 *   20-Apr-2003 : ported to v2.5 (Dustin McIntire, Sensoria Corp.)
 *
 * Note:
 *   This driver may change the memory bus clock rate, but will not do any
 *   platform specific access timing changes... for example if you have flash
 *   memory connected to CS0, you will need to register a platform specific
 *   notifier which will adjust the memory access strobes to maintain a
 *   minimum strobe width.
 */

#define pr_fmt(fmt) …

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/init.h>
#include <linux/cpufreq.h>
#include <linux/err.h>
#include <linux/regulator/consumer.h>
#include <linux/soc/pxa/cpu.h>
#include <linux/io.h>

#ifdef DEBUG
static unsigned int freq_debug;
module_param(freq_debug, uint, 0);
MODULE_PARM_DESC(freq_debug, "Set the debug messages to on=1/off=0");
#else
#define freq_debug …
#endif

static struct regulator *vcc_core;

static unsigned int pxa27x_maxfreq;
module_param(pxa27x_maxfreq, uint, 0);
MODULE_PARM_DESC(…) …;

struct pxa_cpufreq_data { … };
static struct pxa_cpufreq_data  pxa_cpufreq_data;

struct pxa_freqs { … };

/*
 * PXA255 definitions
 */
static const struct pxa_freqs pxa255_run_freqs[] = …;

/* Use the turbo mode frequencies for the CPUFREQ_POLICY_POWERSAVE policy */
static const struct pxa_freqs pxa255_turbo_freqs[] = …;

#define NUM_PXA25x_RUN_FREQS …
#define NUM_PXA25x_TURBO_FREQS …

static struct cpufreq_frequency_table
	pxa255_run_freq_table[NUM_PXA25x_RUN_FREQS+1];
static struct cpufreq_frequency_table
	pxa255_turbo_freq_table[NUM_PXA25x_TURBO_FREQS+1];

static unsigned int pxa255_turbo_table;
module_param(pxa255_turbo_table, uint, 0);
MODULE_PARM_DESC(…) …;

static struct pxa_freqs pxa27x_freqs[] = …;

#define NUM_PXA27x_FREQS …
static struct cpufreq_frequency_table
	pxa27x_freq_table[NUM_PXA27x_FREQS+1];

#ifdef CONFIG_REGULATOR

static int pxa_cpufreq_change_voltage(const struct pxa_freqs *pxa_freq)
{ … }

static void pxa_cpufreq_init_voltages(void)
{ … }
#else
static int pxa_cpufreq_change_voltage(const struct pxa_freqs *pxa_freq)
{
	return 0;
}

static void pxa_cpufreq_init_voltages(void) { }
#endif

static void find_freq_tables(struct cpufreq_frequency_table **freq_table,
			     const struct pxa_freqs **pxa_freqs)
{ … }

static void pxa27x_guess_max_freq(void)
{ … }

static unsigned int pxa_cpufreq_get(unsigned int cpu)
{ … }

static int pxa_set_target(struct cpufreq_policy *policy, unsigned int idx)
{ … }

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

static struct cpufreq_driver pxa_cpufreq_driver = …;

static int __init pxa_cpu_init(void)
{ … }

static void __exit pxa_cpu_exit(void)
{ … }


MODULE_AUTHOR(…) …;
MODULE_DESCRIPTION(…) …;
MODULE_LICENSE(…) …;
module_init(…) …;
module_exit(pxa_cpu_exit);