Orange Pi5 kernel

^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)  * PM domains for CPUs via genpd - managed by cpuidle-psci.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  * Copyright (C) 2019 Linaro Ltd.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  * Author: Ulf Hansson <ulf.hansson@linaro.org>
^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) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #define pr_fmt(fmt) "CPUidle PSCI: " fmt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) 
^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/device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <linux/platform_device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <linux/pm_domain.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include <linux/pm_runtime.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #include <linux/psci.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/string.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) #include "cpuidle-psci.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) struct psci_pd_provider {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) 	struct list_head link;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) 	struct device_node *node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) static LIST_HEAD(psci_pd_providers);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) static bool psci_pd_allow_domain_state;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) static int psci_pd_power_off(struct generic_pm_domain *pd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 	struct genpd_power_state *state = &pd->states[pd->state_idx];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 	u32 *pd_state;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 	if (!state->data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 	if (!psci_pd_allow_domain_state)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 		return -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 	/* OSI mode is enabled, set the corresponding domain state. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 	pd_state = state->data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 	psci_set_domain_state(*pd_state);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) static int psci_pd_parse_state_nodes(struct genpd_power_state *states,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 				     int state_count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 	int i, ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 	u32 psci_state, *psci_state_buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 	for (i = 0; i < state_count; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 		ret = psci_dt_parse_state_node(to_of_node(states[i].fwnode),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 					&psci_state);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 		if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 			goto free_state;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 		psci_state_buf = kmalloc(sizeof(u32), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 		if (!psci_state_buf) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 			ret = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 			goto free_state;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 		*psci_state_buf = psci_state;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 		states[i].data = psci_state_buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) free_state:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 	i--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 	for (; i >= 0; i--)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 		kfree(states[i].data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) static int psci_pd_parse_states(struct device_node *np,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 			struct genpd_power_state **states, int *state_count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 	/* Parse the domain idle states. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 	ret = of_genpd_parse_idle_states(np, states, state_count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 	if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 	/* Fill out the PSCI specifics for each found state. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 	ret = psci_pd_parse_state_nodes(*states, *state_count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 	if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 		kfree(*states);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) static void psci_pd_free_states(struct genpd_power_state *states,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 				unsigned int state_count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 	int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 	for (i = 0; i < state_count; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 		kfree(states[i].data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 	kfree(states);
^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 psci_pd_init(struct device_node *np, bool use_osi)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 	struct generic_pm_domain *pd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 	struct psci_pd_provider *pd_provider;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 	struct dev_power_governor *pd_gov;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 	struct genpd_power_state *states = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 	int ret = -ENOMEM, state_count = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 	pd = kzalloc(sizeof(*pd), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 	if (!pd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 	pd_provider = kzalloc(sizeof(*pd_provider), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 	if (!pd_provider)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 		goto free_pd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 	pd->name = kasprintf(GFP_KERNEL, "%pOF", np);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 	if (!pd->name)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 		goto free_pd_prov;
^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) 	 * Parse the domain idle states and let genpd manage the state selection
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 	 * for those being compatible with "domain-idle-state".
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 	ret = psci_pd_parse_states(np, &states, &state_count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 	if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 		goto free_name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 	pd->free_states = psci_pd_free_states;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 	pd->name = kbasename(pd->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 	pd->states = states;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 	pd->state_count = state_count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 	pd->flags |= GENPD_FLAG_IRQ_SAFE | GENPD_FLAG_CPU_DOMAIN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 	/* Allow power off when OSI has been successfully enabled. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 	if (use_osi)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 		pd->power_off = psci_pd_power_off;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 	else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 		pd->flags |= GENPD_FLAG_ALWAYS_ON;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 	/* Use governor for CPU PM domains if it has some states to manage. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 	pd_gov = state_count > 0 ? &pm_domain_cpu_gov : NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 	ret = pm_genpd_init(pd, pd_gov, false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 	if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 		psci_pd_free_states(states, state_count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 		goto free_name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 	ret = of_genpd_add_provider_simple(np, pd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 	if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 		goto remove_pd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 	pd_provider->node = of_node_get(np);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 	list_add(&pd_provider->link, &psci_pd_providers);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 	pr_debug("init PM domain %s\n", pd->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) remove_pd:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 	pm_genpd_remove(pd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) free_name:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 	kfree(pd->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) free_pd_prov:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 	kfree(pd_provider);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) free_pd:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 	kfree(pd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 	pr_err("failed to init PM domain ret=%d %pOF\n", ret, np);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) static void psci_pd_remove(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 	struct psci_pd_provider *pd_provider, *it;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 	struct generic_pm_domain *genpd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 	list_for_each_entry_safe(pd_provider, it, &psci_pd_providers, link) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 		of_genpd_del_provider(pd_provider->node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 		genpd = of_genpd_remove_last(pd_provider->node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 		if (!IS_ERR(genpd))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 			kfree(genpd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 		of_node_put(pd_provider->node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 		list_del(&pd_provider->link);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 		kfree(pd_provider);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) static int psci_pd_init_topology(struct device_node *np)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 	struct device_node *node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 	struct of_phandle_args child, parent;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 	for_each_child_of_node(np, node) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 		if (of_parse_phandle_with_args(node, "power-domains",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 					"#power-domain-cells", 0, &parent))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 			continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 		child.np = node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 		child.args_count = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 		ret = of_genpd_add_subdomain(&parent, &child);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 		of_node_put(parent.np);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 		if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 			of_node_put(node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 			return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) static bool psci_pd_try_set_osi_mode(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 	if (!psci_has_osi_support())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 		return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 	ret = psci_set_osi_mode(true);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 	if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 		pr_warn("failed to enable OSI mode: %d\n", ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 		return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 	return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) static void psci_cpuidle_domain_sync_state(struct device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 	 * All devices have now been attached/probed to the PM domain topology,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 	 * hence it's fine to allow domain states to be picked.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 	psci_pd_allow_domain_state = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) static const struct of_device_id psci_of_match[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 	{ .compatible = "arm,psci-1.0" },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 	{}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) static int psci_cpuidle_domain_probe(struct platform_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 	struct device_node *np = pdev->dev.of_node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 	struct device_node *node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 	bool use_osi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 	int ret = 0, pd_count = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 	if (!np)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 		return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 	/* If OSI mode is supported, let's try to enable it. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 	use_osi = psci_pd_try_set_osi_mode();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 	 * Parse child nodes for the "#power-domain-cells" property and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 	 * initialize a genpd/genpd-of-provider pair when it's found.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 	for_each_child_of_node(np, node) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 		if (!of_find_property(node, "#power-domain-cells", NULL))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 			continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 		ret = psci_pd_init(node, use_osi);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 		if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 			goto put_node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 		pd_count++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 	/* Bail out if not using the hierarchical CPU topology. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 	if (!pd_count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 		goto no_pd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 	/* Link genpd masters/subdomains to model the CPU topology. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 	ret = psci_pd_init_topology(np);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 	if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 		goto remove_pd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 	pr_info("Initialized CPU PM domain topology\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) put_node:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 	of_node_put(node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) remove_pd:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 	psci_pd_remove();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 	pr_err("failed to create CPU PM domains ret=%d\n", ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) no_pd:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 	if (use_osi)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 		psci_set_osi_mode(false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) static struct platform_driver psci_cpuidle_domain_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) 	.probe  = psci_cpuidle_domain_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 	.driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) 		.name = "psci-cpuidle-domain",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) 		.of_match_table = psci_of_match,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) 		.sync_state = psci_cpuidle_domain_sync_state,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) 	},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) static int __init psci_idle_init_domains(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) 	return platform_driver_register(&psci_cpuidle_domain_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) subsys_initcall(psci_idle_init_domains);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) struct device *psci_dt_attach_cpu(int cpu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) 	struct device *dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) 	dev = dev_pm_domain_attach_by_name(get_cpu_device(cpu), "psci");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) 	if (IS_ERR_OR_NULL(dev))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) 		return dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) 	pm_runtime_irq_safe(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) 	if (cpu_online(cpu))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) 		pm_runtime_get_sync(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) 	dev_pm_syscore_device(dev, true);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) 	return dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) void psci_dt_detach_cpu(struct device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) 	if (IS_ERR_OR_NULL(dev))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) 	dev_pm_domain_detach(dev, false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) }