^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) * cpufreq driver for the SuperH processors.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * Copyright (C) 2002 - 2012 Paul Mundt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright (C) 2002 M. R. Brown
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * Clock framework bits from arch/avr32/mach-at32ap/cpufreq.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) * Copyright (C) 2004-2007 Atmel Corporation
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) * This file is subject to the terms and conditions of the GNU General Public
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) * License. See the file "COPYING" in the main directory of this archive
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) * for more details.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #define pr_fmt(fmt) "cpufreq: " fmt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/cpufreq.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include <linux/err.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #include <linux/cpumask.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #include <linux/cpu.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #include <linux/smp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #include <linux/sched.h> /* set_cpus_allowed() */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #include <linux/clk.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) #include <linux/percpu.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) #include <linux/sh_clk.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) static DEFINE_PER_CPU(struct clk, sh_cpuclk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) struct cpufreq_target {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) struct cpufreq_policy *policy;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) unsigned int freq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) static unsigned int sh_cpufreq_get(unsigned int cpu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) return (clk_get_rate(&per_cpu(sh_cpuclk, cpu)) + 500) / 1000;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) static long __sh_cpufreq_target(void *arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) struct cpufreq_target *target = arg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) struct cpufreq_policy *policy = target->policy;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) int cpu = policy->cpu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) struct clk *cpuclk = &per_cpu(sh_cpuclk, cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) struct cpufreq_freqs freqs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) struct device *dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) long freq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) if (smp_processor_id() != cpu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) dev = get_cpu_device(cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) /* Convert target_freq from kHz to Hz */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) freq = clk_round_rate(cpuclk, target->freq * 1000);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) if (freq < (policy->min * 1000) || freq > (policy->max * 1000))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) dev_dbg(dev, "requested frequency %u Hz\n", target->freq * 1000);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) freqs.old = sh_cpufreq_get(cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) freqs.new = (freq + 500) / 1000;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) freqs.flags = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) cpufreq_freq_transition_begin(target->policy, &freqs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) clk_set_rate(cpuclk, freq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) cpufreq_freq_transition_end(target->policy, &freqs, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) dev_dbg(dev, "set frequency %lu Hz\n", freq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) * Here we notify other drivers of the proposed change and the final change.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) static int sh_cpufreq_target(struct cpufreq_policy *policy,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) unsigned int target_freq,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) unsigned int relation)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) struct cpufreq_target data = { .policy = policy, .freq = target_freq };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) return work_on_cpu(policy->cpu, __sh_cpufreq_target, &data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) static int sh_cpufreq_verify(struct cpufreq_policy_data *policy)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) struct clk *cpuclk = &per_cpu(sh_cpuclk, policy->cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) struct cpufreq_frequency_table *freq_table;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) freq_table = cpuclk->nr_freqs ? cpuclk->freq_table : NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) if (freq_table)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) return cpufreq_frequency_table_verify(policy, freq_table);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) cpufreq_verify_within_cpu_limits(policy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) policy->min = (clk_round_rate(cpuclk, 1) + 500) / 1000;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) policy->max = (clk_round_rate(cpuclk, ~0UL) + 500) / 1000;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) cpufreq_verify_within_cpu_limits(policy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) static int sh_cpufreq_cpu_init(struct cpufreq_policy *policy)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) unsigned int cpu = policy->cpu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) struct clk *cpuclk = &per_cpu(sh_cpuclk, cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) struct cpufreq_frequency_table *freq_table;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) struct device *dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) dev = get_cpu_device(cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) cpuclk = clk_get(dev, "cpu_clk");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) if (IS_ERR(cpuclk)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) dev_err(dev, "couldn't get CPU clk\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) return PTR_ERR(cpuclk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) freq_table = cpuclk->nr_freqs ? cpuclk->freq_table : NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) if (freq_table) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) policy->freq_table = freq_table;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) dev_notice(dev, "no frequency table found, falling back "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) "to rate rounding.\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) policy->min = policy->cpuinfo.min_freq =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) (clk_round_rate(cpuclk, 1) + 500) / 1000;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) policy->max = policy->cpuinfo.max_freq =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) (clk_round_rate(cpuclk, ~0UL) + 500) / 1000;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) static int sh_cpufreq_cpu_exit(struct cpufreq_policy *policy)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) unsigned int cpu = policy->cpu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) struct clk *cpuclk = &per_cpu(sh_cpuclk, cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) clk_put(cpuclk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) static void sh_cpufreq_cpu_ready(struct cpufreq_policy *policy)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) struct device *dev = get_cpu_device(policy->cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) dev_info(dev, "CPU Frequencies - Minimum %u.%03u MHz, "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) "Maximum %u.%03u MHz.\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) policy->min / 1000, policy->min % 1000,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) policy->max / 1000, policy->max % 1000);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) static struct cpufreq_driver sh_cpufreq_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) .name = "sh",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) .flags = CPUFREQ_NO_AUTO_DYNAMIC_SWITCHING,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) .get = sh_cpufreq_get,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) .target = sh_cpufreq_target,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) .verify = sh_cpufreq_verify,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) .init = sh_cpufreq_cpu_init,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) .exit = sh_cpufreq_cpu_exit,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) .ready = sh_cpufreq_cpu_ready,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) .attr = cpufreq_generic_attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) static int __init sh_cpufreq_module_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) pr_notice("SuperH CPU frequency driver.\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) return cpufreq_register_driver(&sh_cpufreq_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) static void __exit sh_cpufreq_module_exit(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) cpufreq_unregister_driver(&sh_cpufreq_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) module_init(sh_cpufreq_module_init);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) module_exit(sh_cpufreq_module_exit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) MODULE_AUTHOR("Paul Mundt <lethal@linux-sh.org>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) MODULE_DESCRIPTION("cpufreq driver for SuperH");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) MODULE_LICENSE("GPL");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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