linux/drivers/cpufreq/apple-soc-cpufreq.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Apple SoC CPU cluster performance state driver
 *
 * Copyright The Asahi Linux Contributors
 *
 * Based on scpi-cpufreq.c
 */

#include <linux/bitfield.h>
#include <linux/bitops.h>
#include <linux/cpu.h>
#include <linux/cpufreq.h>
#include <linux/cpumask.h>
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/iopoll.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/pm_opp.h>
#include <linux/slab.h>

#define APPLE_DVFS_CMD …
#define APPLE_DVFS_CMD_BUSY …
#define APPLE_DVFS_CMD_SET …
#define APPLE_DVFS_CMD_PS2 …
#define APPLE_DVFS_CMD_PS1 …

/* Same timebase as CPU counter (24MHz) */
#define APPLE_DVFS_LAST_CHG_TIME …

/*
 * Apple ran out of bits and had to shift this in T8112...
 */
#define APPLE_DVFS_STATUS …
#define APPLE_DVFS_STATUS_CUR_PS_T8103 …
#define APPLE_DVFS_STATUS_CUR_PS_SHIFT_T8103 …
#define APPLE_DVFS_STATUS_TGT_PS_T8103 …
#define APPLE_DVFS_STATUS_CUR_PS_T8112 …
#define APPLE_DVFS_STATUS_CUR_PS_SHIFT_T8112 …
#define APPLE_DVFS_STATUS_TGT_PS_T8112 …

/*
 * Div is +1, base clock is 12MHz on existing SoCs.
 * For documentation purposes. We use the OPP table to
 * get the frequency.
 */
#define APPLE_DVFS_PLL_STATUS …
#define APPLE_DVFS_PLL_FACTOR …
#define APPLE_DVFS_PLL_FACTOR_MULT …
#define APPLE_DVFS_PLL_FACTOR_DIV …

#define APPLE_DVFS_TRANSITION_TIMEOUT …

struct apple_soc_cpufreq_info { … };

struct apple_cpu_priv { … };

static struct cpufreq_driver apple_soc_cpufreq_driver;

static const struct apple_soc_cpufreq_info soc_t8103_info = …;

static const struct apple_soc_cpufreq_info soc_t8112_info = …;

static const struct apple_soc_cpufreq_info soc_default_info = …;

static const struct of_device_id apple_soc_cpufreq_of_match[] __maybe_unused = …;

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

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

static unsigned int apple_soc_cpufreq_fast_switch(struct cpufreq_policy *policy,
						  unsigned int target_freq)
{ … }

static int apple_soc_cpufreq_find_cluster(struct cpufreq_policy *policy,
					  void __iomem **reg_base,
					  const struct apple_soc_cpufreq_info **info)
{ … }

static struct freq_attr *apple_soc_cpufreq_hw_attr[] = …;

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

static void apple_soc_cpufreq_exit(struct cpufreq_policy *policy)
{ … }

static struct cpufreq_driver apple_soc_cpufreq_driver = …;

static int __init apple_soc_cpufreq_module_init(void)
{ … }
module_init(…) …;

static void __exit apple_soc_cpufreq_module_exit(void)
{ … }
module_exit(apple_soc_cpufreq_module_exit);

MODULE_DEVICE_TABLE(of, apple_soc_cpufreq_of_match);
MODULE_AUTHOR(…) …;
MODULE_DESCRIPTION(…) …;
MODULE_LICENSE(…) …;