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![Anup Patel](/assets/img/avatar_default.png)
The generic power domain related code in PSCI domain driver is largely independent of PSCI and can be shared with RISC-V SBI domain driver hence we factor-out this code into dt_idle_genpd.c and dt_idle_genpd.h. Signed-off-by: Anup Patel <anup.patel@wdc.com> Signed-off-by: Anup Patel <apatel@ventanamicro.com> Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org> Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
178 lines
3.6 KiB
C
178 lines
3.6 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* PM domains for CPUs via genpd.
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*
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* Copyright (C) 2019 Linaro Ltd.
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* Author: Ulf Hansson <ulf.hansson@linaro.org>
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*
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* Copyright (c) 2021 Western Digital Corporation or its affiliates.
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* Copyright (c) 2022 Ventana Micro Systems Inc.
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*/
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#define pr_fmt(fmt) "dt-idle-genpd: " fmt
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#include <linux/cpu.h>
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#include <linux/device.h>
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#include <linux/kernel.h>
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#include <linux/pm_domain.h>
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#include <linux/pm_runtime.h>
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#include <linux/slab.h>
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#include <linux/string.h>
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#include "dt_idle_genpd.h"
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static int pd_parse_state_nodes(
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int (*parse_state)(struct device_node *, u32 *),
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struct genpd_power_state *states, int state_count)
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{
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int i, ret;
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u32 state, *state_buf;
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for (i = 0; i < state_count; i++) {
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ret = parse_state(to_of_node(states[i].fwnode), &state);
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if (ret)
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goto free_state;
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state_buf = kmalloc(sizeof(u32), GFP_KERNEL);
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if (!state_buf) {
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ret = -ENOMEM;
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goto free_state;
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}
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*state_buf = state;
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states[i].data = state_buf;
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}
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return 0;
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free_state:
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i--;
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for (; i >= 0; i--)
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kfree(states[i].data);
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return ret;
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}
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static int pd_parse_states(struct device_node *np,
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int (*parse_state)(struct device_node *, u32 *),
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struct genpd_power_state **states,
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int *state_count)
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{
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int ret;
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/* Parse the domain idle states. */
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ret = of_genpd_parse_idle_states(np, states, state_count);
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if (ret)
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return ret;
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/* Fill out the dt specifics for each found state. */
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ret = pd_parse_state_nodes(parse_state, *states, *state_count);
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if (ret)
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kfree(*states);
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return ret;
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}
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static void pd_free_states(struct genpd_power_state *states,
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unsigned int state_count)
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{
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int i;
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for (i = 0; i < state_count; i++)
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kfree(states[i].data);
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kfree(states);
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}
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void dt_idle_pd_free(struct generic_pm_domain *pd)
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{
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pd_free_states(pd->states, pd->state_count);
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kfree(pd->name);
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kfree(pd);
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}
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struct generic_pm_domain *dt_idle_pd_alloc(struct device_node *np,
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int (*parse_state)(struct device_node *, u32 *))
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{
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struct generic_pm_domain *pd;
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struct genpd_power_state *states = NULL;
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int ret, state_count = 0;
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pd = kzalloc(sizeof(*pd), GFP_KERNEL);
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if (!pd)
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goto out;
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pd->name = kasprintf(GFP_KERNEL, "%pOF", np);
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if (!pd->name)
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goto free_pd;
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/*
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* Parse the domain idle states and let genpd manage the state selection
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* for those being compatible with "domain-idle-state".
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*/
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ret = pd_parse_states(np, parse_state, &states, &state_count);
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if (ret)
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goto free_name;
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pd->free_states = pd_free_states;
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pd->name = kbasename(pd->name);
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pd->states = states;
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pd->state_count = state_count;
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pr_debug("alloc PM domain %s\n", pd->name);
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return pd;
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free_name:
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kfree(pd->name);
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free_pd:
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kfree(pd);
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out:
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pr_err("failed to alloc PM domain %pOF\n", np);
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return NULL;
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}
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int dt_idle_pd_init_topology(struct device_node *np)
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{
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struct device_node *node;
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struct of_phandle_args child, parent;
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int ret;
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for_each_child_of_node(np, node) {
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if (of_parse_phandle_with_args(node, "power-domains",
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"#power-domain-cells", 0, &parent))
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continue;
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child.np = node;
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child.args_count = 0;
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ret = of_genpd_add_subdomain(&parent, &child);
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of_node_put(parent.np);
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if (ret) {
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of_node_put(node);
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return ret;
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}
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}
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return 0;
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}
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struct device *dt_idle_attach_cpu(int cpu, const char *name)
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{
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struct device *dev;
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dev = dev_pm_domain_attach_by_name(get_cpu_device(cpu), name);
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if (IS_ERR_OR_NULL(dev))
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return dev;
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pm_runtime_irq_safe(dev);
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if (cpu_online(cpu))
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pm_runtime_get_sync(dev);
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dev_pm_syscore_device(dev, true);
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return dev;
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}
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void dt_idle_detach_cpu(struct device *dev)
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{
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if (IS_ERR_OR_NULL(dev))
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return;
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dev_pm_domain_detach(dev, false);
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}
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