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-rw-r--r--drivers/firmware/psci/Makefile2
-rw-r--r--drivers/firmware/psci/psci.c7
-rw-r--r--drivers/firmware/psci/psci.h6
-rw-r--r--drivers/firmware/psci/psci_pm_domain.c262
4 files changed, 275 insertions, 2 deletions
diff --git a/drivers/firmware/psci/Makefile b/drivers/firmware/psci/Makefile
index 1956b882470f..ff300f1fec86 100644
--- a/drivers/firmware/psci/Makefile
+++ b/drivers/firmware/psci/Makefile
@@ -1,4 +1,4 @@
# SPDX-License-Identifier: GPL-2.0
#
-obj-$(CONFIG_ARM_PSCI_FW) += psci.o
+obj-$(CONFIG_ARM_PSCI_FW) += psci.o psci_pm_domain.o
obj-$(CONFIG_ARM_PSCI_CHECKER) += psci_checker.o
diff --git a/drivers/firmware/psci/psci.c b/drivers/firmware/psci/psci.c
index 623591b541a4..19af2093151b 100644
--- a/drivers/firmware/psci/psci.c
+++ b/drivers/firmware/psci/psci.c
@@ -704,9 +704,14 @@ static int __init psci_1_0_init(struct device_node *np)
if (err)
return err;
- if (psci_has_osi_support())
+ if (psci_has_osi_support()) {
pr_info("OSI mode supported.\n");
+ /* Make sure we default to PC mode. */
+ invoke_psci_fn(PSCI_1_0_FN_SET_SUSPEND_MODE,
+ PSCI_1_0_SUSPEND_MODE_PC, 0, 0);
+ }
+
return 0;
}
diff --git a/drivers/firmware/psci/psci.h b/drivers/firmware/psci/psci.h
index 7d9d38fd57e1..8cf6d7206fab 100644
--- a/drivers/firmware/psci/psci.h
+++ b/drivers/firmware/psci/psci.h
@@ -11,4 +11,10 @@ void psci_set_domain_state(u32 state);
bool psci_has_osi_support(void);
int psci_dt_parse_state_node(struct device_node *np, u32 *state);
+#ifdef CONFIG_CPU_IDLE
+int psci_dt_init_pm_domains(struct device_node *np);
+#else
+static inline int psci_dt_init_pm_domains(struct device_node *np) { return 0; }
+#endif
+
#endif /* __PSCI_H */
diff --git a/drivers/firmware/psci/psci_pm_domain.c b/drivers/firmware/psci/psci_pm_domain.c
new file mode 100644
index 000000000000..d0dc38e96f85
--- /dev/null
+++ b/drivers/firmware/psci/psci_pm_domain.c
@@ -0,0 +1,262 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * PM domains for CPUs via genpd - managed by PSCI.
+ *
+ * Copyright (C) 2018 Linaro Ltd.
+ * Author: Ulf Hansson <ulf.hansson@linaro.org>
+ *
+ */
+
+#define pr_fmt(fmt) "psci: " fmt
+
+#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/pm_domain.h>
+#include <linux/slab.h>
+#include <linux/string.h>
+
+#include "psci.h"
+
+#ifdef CONFIG_CPU_IDLE
+
+struct psci_pd_provider {
+ struct list_head link;
+ struct device_node *node;
+};
+
+static LIST_HEAD(psci_pd_providers);
+static bool osi_mode_enabled;
+
+static int psci_pd_power_off(struct generic_pm_domain *pd)
+{
+ struct genpd_power_state *state = &pd->states[pd->state_idx];
+ u32 *pd_state;
+ u32 composite_pd_state;
+
+ /* If we have failed to enable OSI mode, then abort power off. */
+ if (psci_has_osi_support() && !osi_mode_enabled)
+ return -EBUSY;
+
+ if (!state->data)
+ return 0;
+
+ /* When OSI mode is enabled, set the corresponding domain state. */
+ pd_state = state->data;
+ composite_pd_state = *pd_state | psci_get_domain_state();
+ psci_set_domain_state(composite_pd_state);
+
+ return 0;
+}
+
+static int psci_pd_parse_state_nodes(struct genpd_power_state *states,
+ int state_count)
+{
+ int i, ret;
+ u32 psci_state, *psci_state_buf;
+
+ for (i = 0; i < state_count; i++) {
+ ret = psci_dt_parse_state_node(to_of_node(states[i].fwnode),
+ &psci_state);
+ if (ret)
+ goto free_state;
+
+ psci_state_buf = kmalloc(sizeof(u32), GFP_KERNEL);
+ if (!psci_state_buf) {
+ ret = -ENOMEM;
+ goto free_state;
+ }
+ *psci_state_buf = psci_state;
+ states[i].data = psci_state_buf;
+ }
+
+ return 0;
+
+free_state:
+ while (i >= 0) {
+ kfree(states[i].data);
+ i--;
+ }
+ return ret;
+}
+
+static int psci_pd_parse_states(struct device_node *np,
+ struct genpd_power_state **states, int *state_count)
+{
+ int ret;
+
+ /* Parse the domain idle states. */
+ ret = of_genpd_parse_idle_states(np, states, state_count);
+ if (ret)
+ return ret;
+
+ /* Fill out the PSCI specifics for each found state. */
+ ret = psci_pd_parse_state_nodes(*states, *state_count);
+ if (ret)
+ kfree(*states);
+
+ return ret;
+}
+
+static int psci_pd_init(struct device_node *np)
+{
+ struct generic_pm_domain *pd;
+ struct psci_pd_provider *pd_provider;
+ struct dev_power_governor *pd_gov;
+ struct genpd_power_state *states = NULL;
+ int i, ret = -ENOMEM, state_count = 0;
+
+ pd = kzalloc(sizeof(*pd), GFP_KERNEL);
+ if (!pd)
+ goto out;
+
+ pd_provider = kzalloc(sizeof(*pd_provider), GFP_KERNEL);
+ if (!pd_provider)
+ goto free_pd;
+
+ pd->name = kasprintf(GFP_KERNEL, "%pOF", np);
+ if (!pd->name)
+ goto free_pd_prov;
+
+ /*
+ * For OSI mode, parse the domain idle states and let genpd manage the
+ * state selection for those being compatible with "domain-idle-state".
+ */
+ if (psci_has_osi_support()) {
+ ret = psci_pd_parse_states(np, &states, &state_count);
+ if (ret)
+ goto free_name;
+ }
+
+ pd->name = kbasename(pd->name);
+ pd->power_off = psci_pd_power_off;
+ pd->states = states;
+ pd->state_count = state_count;
+ pd->flags |= GENPD_FLAG_IRQ_SAFE | GENPD_FLAG_CPU_DOMAIN;
+
+ /* Use governor for CPU PM domains if it has some states to manage. */
+ pd_gov = state_count > 0 ? &pm_domain_cpu_gov : NULL;
+
+ ret = pm_genpd_init(pd, pd_gov, false);
+ if (ret)
+ goto free_state;
+
+ ret = of_genpd_add_provider_simple(np, pd);
+ if (ret)
+ goto remove_pd;
+
+ pd_provider->node = of_node_get(np);
+ list_add(&pd_provider->link, &psci_pd_providers);
+
+ pr_debug("init PM domain %s\n", pd->name);
+ return 0;
+
+remove_pd:
+ pm_genpd_remove(pd);
+free_state:
+ for (i = 0; i < state_count; i++)
+ kfree(states[i].data);
+ kfree(states);
+free_name:
+ kfree(pd->name);
+free_pd_prov:
+ kfree(pd_provider);
+free_pd:
+ kfree(pd);
+out:
+ pr_err("failed to init PM domain ret=%d %pOF\n", ret, np);
+ return ret;
+}
+
+static void psci_pd_remove(void)
+{
+ struct psci_pd_provider *pd_provider, *it;
+ struct generic_pm_domain *genpd;
+ int i;
+
+ list_for_each_entry_safe(pd_provider, it, &psci_pd_providers, link) {
+ of_genpd_del_provider(pd_provider->node);
+
+ genpd = of_genpd_remove_last(pd_provider->node);
+ if (!IS_ERR(genpd)) {
+ for (i = 0; i < genpd->state_count; i++)
+ kfree(genpd->states[i].data);
+ kfree(genpd->states);
+ kfree(genpd);
+ }
+
+ of_node_put(pd_provider->node);
+ list_del(&pd_provider->link);
+ kfree(pd_provider);
+ }
+}
+
+static int psci_pd_init_topology(struct device_node *np)
+{
+ struct device_node *node;
+ struct of_phandle_args child, parent;
+ int ret;
+
+ for_each_child_of_node(np, node) {
+ if (of_parse_phandle_with_args(node, "power-domains",
+ "#power-domain-cells", 0, &parent))
+ continue;
+
+ child.np = node;
+ child.args_count = 0;
+
+ ret = of_genpd_add_subdomain(&parent, &child);
+ of_node_put(parent.np);
+ if (ret) {
+ of_node_put(node);
+ return ret;
+ }
+ }
+
+ return 0;
+}
+
+int psci_dt_init_pm_domains(struct device_node *np)
+{
+ struct device_node *node;
+ int ret, pd_count = 0;
+
+ /*
+ * Parse child nodes for the "#power-domain-cells" property and
+ * initialize a genpd/genpd-of-provider pair when it's found.
+ */
+ for_each_child_of_node(np, node) {
+ if (!of_find_property(node, "#power-domain-cells", NULL))
+ continue;
+
+ ret = psci_pd_init(node);
+ if (ret)
+ goto put_node;
+
+ pd_count++;
+ }
+
+ /* Bail out if not using the hierarchical CPU topology. */
+ if (!pd_count)
+ return 0;
+
+ /* Link genpd masters/subdomains to model the CPU topology. */
+ ret = psci_pd_init_topology(np);
+ if (ret)
+ goto remove_pd;
+
+ /* Try to enable OSI mode if supported. */
+ if (psci_has_osi_support())
+ osi_mode_enabled = psci_set_osi_mode();
+
+ pr_info("Initialized CPU PM domain topology\n");
+ return pd_count;
+
+put_node:
+ of_node_put(node);
+remove_pd:
+ if (pd_count)
+ psci_pd_remove();
+ pr_err("failed to create CPU PM domains ret=%d\n", ret);
+ return ret;
+}
+#endif
generated by cgit v1.2.3 (git 2.25.1) at 2024-04-30 14:38:16 +0000