^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) #include <linux/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) #include <linux/errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) #include <linux/delay.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) #include <linux/pm_qos.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/wait.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/cpu.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/cpufreq.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <asm/prom.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include "windfarm.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #define VERSION "0.3"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) static int clamped;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) static struct wf_control *clamp_control;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) static struct freq_qos_request qos_req;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) static unsigned int min_freq, max_freq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) static int clamp_set(struct wf_control *ct, s32 value)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) unsigned int freq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) if (value) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) freq = min_freq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) printk(KERN_INFO "windfarm: Clamping CPU frequency to "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) "minimum !\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) freq = max_freq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) printk(KERN_INFO "windfarm: CPU frequency unclamped !\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) clamped = value;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) return freq_qos_update_request(&qos_req, freq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) static int clamp_get(struct wf_control *ct, s32 *value)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) *value = clamped;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) static s32 clamp_min(struct wf_control *ct)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) static s32 clamp_max(struct wf_control *ct)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) static const struct wf_control_ops clamp_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) .set_value = clamp_set,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) .get_value = clamp_get,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) .get_min = clamp_min,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) .get_max = clamp_max,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) .owner = THIS_MODULE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) static int __init wf_cpufreq_clamp_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) struct cpufreq_policy *policy;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) struct wf_control *clamp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) struct device *dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) policy = cpufreq_cpu_get(0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) if (!policy) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) pr_warn("%s: cpufreq policy not found cpu0\n", __func__);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) return -EPROBE_DEFER;
^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) min_freq = policy->cpuinfo.min_freq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) max_freq = policy->cpuinfo.max_freq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) ret = freq_qos_add_request(&policy->constraints, &qos_req, FREQ_QOS_MAX,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) max_freq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) cpufreq_cpu_put(policy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) if (ret < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) pr_err("%s: Failed to add freq constraint (%d)\n", __func__,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) dev = get_cpu_device(0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) if (unlikely(!dev)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) pr_warn("%s: No cpu device for cpu0\n", __func__);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) ret = -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) goto fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) clamp = kmalloc(sizeof(struct wf_control), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) if (clamp == NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) ret = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) goto fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) clamp->ops = &clamp_ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) clamp->name = "cpufreq-clamp";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) ret = wf_register_control(clamp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) goto free;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) clamp_control = clamp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) free:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) kfree(clamp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) fail:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) freq_qos_remove_request(&qos_req);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) static void __exit wf_cpufreq_clamp_exit(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) if (clamp_control) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) wf_unregister_control(clamp_control);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) freq_qos_remove_request(&qos_req);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) module_init(wf_cpufreq_clamp_init);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) module_exit(wf_cpufreq_clamp_exit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) MODULE_DESCRIPTION("CPU frequency clamp for PowerMacs thermal control");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) MODULE_LICENSE("GPL");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136)
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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