^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * System Control and Power Interface (SCMI) based CPUFreq Interface driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright (C) 2018 ARM Ltd.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * Sudeep Holla <sudeep.holla@arm.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/clk-provider.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/cpu.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/cpufreq.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/cpumask.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/energy_model.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/export.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/pm_opp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <linux/scmi_protocol.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <linux/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) struct scmi_data {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) int domain_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) struct device *cpu_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) static struct scmi_protocol_handle *ph;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) static const struct scmi_perf_proto_ops *perf_ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) static unsigned int scmi_cpufreq_get_rate(unsigned int cpu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) struct cpufreq_policy *policy = cpufreq_cpu_get_raw(cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) struct scmi_data *priv = policy->driver_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) unsigned long rate;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) ret = perf_ops->freq_get(ph, priv->domain_id, &rate, false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) return rate / 1000;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) * perf_ops->freq_set is not a synchronous, the actual OPP change will
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) * happen asynchronously and can get notified if the events are
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) * subscribed for by the SCMI firmware
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) static int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) scmi_cpufreq_set_target(struct cpufreq_policy *policy, unsigned int index)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) struct scmi_data *priv = policy->driver_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) u64 freq = policy->freq_table[index].frequency;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) return perf_ops->freq_set(ph, priv->domain_id, freq * 1000, false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) static unsigned int scmi_cpufreq_fast_switch(struct cpufreq_policy *policy,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) unsigned int target_freq)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) struct scmi_data *priv = policy->driver_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) if (!perf_ops->freq_set(ph, priv->domain_id,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) target_freq * 1000, true))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) return target_freq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) static int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) scmi_get_sharing_cpus(struct device *cpu_dev, struct cpumask *cpumask)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) int cpu, domain, tdomain;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) struct device *tcpu_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) domain = perf_ops->device_domain_id(cpu_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) if (domain < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) return domain;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) for_each_possible_cpu(cpu) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) if (cpu == cpu_dev->id)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) tcpu_dev = get_cpu_device(cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) if (!tcpu_dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) tdomain = perf_ops->device_domain_id(tcpu_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) if (tdomain == domain)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) cpumask_set_cpu(cpu, cpumask);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) static int __maybe_unused
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) scmi_get_cpu_power(unsigned long *power, unsigned long *KHz,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) struct device *cpu_dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) unsigned long Hz;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) int ret, domain;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) domain = perf_ops->device_domain_id(cpu_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) if (domain < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) return domain;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) /* Get the power cost of the performance domain. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) Hz = *KHz * 1000;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) ret = perf_ops->est_power_get(ph, domain, &Hz, power);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) /* The EM framework specifies the frequency in KHz. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) *KHz = Hz / 1000;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) static int scmi_cpufreq_init(struct cpufreq_policy *policy)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) int ret, nr_opp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) unsigned int latency;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) struct device *cpu_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) struct scmi_data *priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) struct cpufreq_frequency_table *freq_table;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) struct em_data_callback em_cb = EM_DATA_CB(scmi_get_cpu_power);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) bool power_scale_mw;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) cpu_dev = get_cpu_device(policy->cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) if (!cpu_dev) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) pr_err("failed to get cpu%d device\n", policy->cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) ret = perf_ops->device_opps_add(ph, cpu_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) dev_warn(cpu_dev, "failed to add opps to the device\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) ret = scmi_get_sharing_cpus(cpu_dev, policy->cpus);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) dev_warn(cpu_dev, "failed to get sharing cpumask\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) ret = dev_pm_opp_set_sharing_cpus(cpu_dev, policy->cpus);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) dev_err(cpu_dev, "%s: failed to mark OPPs as shared: %d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) __func__, ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) nr_opp = dev_pm_opp_get_opp_count(cpu_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) if (nr_opp <= 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) dev_dbg(cpu_dev, "OPP table is not ready, deferring probe\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) ret = -EPROBE_DEFER;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) goto out_free_opp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) priv = kzalloc(sizeof(*priv), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) if (!priv) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) ret = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) goto out_free_opp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) ret = dev_pm_opp_init_cpufreq_table(cpu_dev, &freq_table);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) dev_err(cpu_dev, "failed to init cpufreq table: %d\n", ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) goto out_free_priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) priv->cpu_dev = cpu_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) priv->domain_id = perf_ops->device_domain_id(cpu_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) policy->driver_data = priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) policy->freq_table = freq_table;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) /* SCMI allows DVFS request for any domain from any CPU */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) policy->dvfs_possible_from_any_cpu = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) latency = perf_ops->transition_latency_get(ph, cpu_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) if (!latency)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) latency = CPUFREQ_ETERNAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) policy->cpuinfo.transition_latency = latency;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) policy->fast_switch_possible =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) perf_ops->fast_switch_possible(ph, cpu_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) power_scale_mw = perf_ops->power_scale_mw_get(ph);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) em_dev_register_perf_domain(cpu_dev, nr_opp, &em_cb, policy->cpus,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) power_scale_mw);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) out_free_priv:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) kfree(priv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) out_free_opp:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) dev_pm_opp_remove_all_dynamic(cpu_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) static int scmi_cpufreq_exit(struct cpufreq_policy *policy)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) struct scmi_data *priv = policy->driver_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) dev_pm_opp_free_cpufreq_table(priv->cpu_dev, &policy->freq_table);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) dev_pm_opp_remove_all_dynamic(priv->cpu_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) kfree(priv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) static struct cpufreq_driver scmi_cpufreq_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) .name = "scmi",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) .flags = CPUFREQ_STICKY | CPUFREQ_HAVE_GOVERNOR_PER_POLICY |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) CPUFREQ_NEED_INITIAL_FREQ_CHECK |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) CPUFREQ_IS_COOLING_DEV,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) .verify = cpufreq_generic_frequency_table_verify,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) .attr = cpufreq_generic_attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) .target_index = scmi_cpufreq_set_target,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) .fast_switch = scmi_cpufreq_fast_switch,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) .get = scmi_cpufreq_get_rate,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) .init = scmi_cpufreq_init,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) .exit = scmi_cpufreq_exit,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) static int scmi_cpufreq_probe(struct scmi_device *sdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) struct device *dev = &sdev->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) const struct scmi_handle *handle;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) handle = sdev->handle;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) if (!handle)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) perf_ops = handle->devm_get_protocol(sdev, SCMI_PROTOCOL_PERF, &ph);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) if (IS_ERR(perf_ops))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) return PTR_ERR(perf_ops);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) #ifdef CONFIG_COMMON_CLK
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) /* dummy clock provider as needed by OPP if clocks property is used */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) if (of_find_property(dev->of_node, "#clock-cells", NULL))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) devm_of_clk_add_hw_provider(dev, of_clk_hw_simple_get, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) ret = cpufreq_register_driver(&scmi_cpufreq_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) dev_err(dev, "%s: registering cpufreq failed, err: %d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) __func__, ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) static void scmi_cpufreq_remove(struct scmi_device *sdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) cpufreq_unregister_driver(&scmi_cpufreq_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) static const struct scmi_device_id scmi_id_table[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) { SCMI_PROTOCOL_PERF, "cpufreq" },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) { },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) MODULE_DEVICE_TABLE(scmi, scmi_id_table);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) static struct scmi_driver scmi_cpufreq_drv = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) .name = "scmi-cpufreq",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) .probe = scmi_cpufreq_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) .remove = scmi_cpufreq_remove,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) .id_table = scmi_id_table,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) module_scmi_driver(scmi_cpufreq_drv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) MODULE_AUTHOR("Sudeep Holla <sudeep.holla@arm.com>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) MODULE_DESCRIPTION("ARM SCMI CPUFreq interface driver");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) MODULE_LICENSE("GPL v2");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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