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129 lines
3.1 KiB
129 lines
3.1 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* SCMI Generic power domain support. |
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* |
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* Copyright (C) 2018 ARM Ltd. |
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*/ |
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#include <linux/err.h> |
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#include <linux/io.h> |
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#include <linux/module.h> |
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#include <linux/pm_domain.h> |
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#include <linux/scmi_protocol.h> |
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struct scmi_pm_domain { |
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struct generic_pm_domain genpd; |
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const struct scmi_handle *handle; |
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const char *name; |
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u32 domain; |
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}; |
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#define to_scmi_pd(gpd) container_of(gpd, struct scmi_pm_domain, genpd) |
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static int scmi_pd_power(struct generic_pm_domain *domain, bool power_on) |
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{ |
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int ret; |
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u32 state, ret_state; |
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struct scmi_pm_domain *pd = to_scmi_pd(domain); |
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const struct scmi_power_ops *ops = pd->handle->power_ops; |
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if (power_on) |
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state = SCMI_POWER_STATE_GENERIC_ON; |
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else |
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state = SCMI_POWER_STATE_GENERIC_OFF; |
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ret = ops->state_set(pd->handle, pd->domain, state); |
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if (!ret) |
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ret = ops->state_get(pd->handle, pd->domain, &ret_state); |
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if (!ret && state != ret_state) |
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return -EIO; |
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return ret; |
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} |
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static int scmi_pd_power_on(struct generic_pm_domain *domain) |
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{ |
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return scmi_pd_power(domain, true); |
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} |
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static int scmi_pd_power_off(struct generic_pm_domain *domain) |
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{ |
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return scmi_pd_power(domain, false); |
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} |
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static int scmi_pm_domain_probe(struct scmi_device *sdev) |
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{ |
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int num_domains, i; |
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struct device *dev = &sdev->dev; |
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struct device_node *np = dev->of_node; |
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struct scmi_pm_domain *scmi_pd; |
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struct genpd_onecell_data *scmi_pd_data; |
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struct generic_pm_domain **domains; |
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const struct scmi_handle *handle = sdev->handle; |
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if (!handle || !handle->power_ops) |
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return -ENODEV; |
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num_domains = handle->power_ops->num_domains_get(handle); |
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if (num_domains < 0) { |
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dev_err(dev, "number of domains not found\n"); |
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return num_domains; |
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} |
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scmi_pd = devm_kcalloc(dev, num_domains, sizeof(*scmi_pd), GFP_KERNEL); |
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if (!scmi_pd) |
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return -ENOMEM; |
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scmi_pd_data = devm_kzalloc(dev, sizeof(*scmi_pd_data), GFP_KERNEL); |
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if (!scmi_pd_data) |
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return -ENOMEM; |
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domains = devm_kcalloc(dev, num_domains, sizeof(*domains), GFP_KERNEL); |
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if (!domains) |
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return -ENOMEM; |
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for (i = 0; i < num_domains; i++, scmi_pd++) { |
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u32 state; |
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if (handle->power_ops->state_get(handle, i, &state)) { |
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dev_warn(dev, "failed to get state for domain %d\n", i); |
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continue; |
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} |
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scmi_pd->domain = i; |
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scmi_pd->handle = handle; |
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scmi_pd->name = handle->power_ops->name_get(handle, i); |
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scmi_pd->genpd.name = scmi_pd->name; |
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scmi_pd->genpd.power_off = scmi_pd_power_off; |
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scmi_pd->genpd.power_on = scmi_pd_power_on; |
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pm_genpd_init(&scmi_pd->genpd, NULL, |
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state == SCMI_POWER_STATE_GENERIC_OFF); |
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domains[i] = &scmi_pd->genpd; |
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} |
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scmi_pd_data->domains = domains; |
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scmi_pd_data->num_domains = num_domains; |
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of_genpd_add_provider_onecell(np, scmi_pd_data); |
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return 0; |
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} |
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static const struct scmi_device_id scmi_id_table[] = { |
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{ SCMI_PROTOCOL_POWER, "genpd" }, |
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{ }, |
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}; |
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MODULE_DEVICE_TABLE(scmi, scmi_id_table); |
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static struct scmi_driver scmi_power_domain_driver = { |
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.name = "scmi-power-domain", |
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.probe = scmi_pm_domain_probe, |
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.id_table = scmi_id_table, |
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}; |
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module_scmi_driver(scmi_power_domain_driver); |
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MODULE_AUTHOR("Sudeep Holla <[email protected]>"); |
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MODULE_DESCRIPTION("ARM SCMI power domain driver"); |
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MODULE_LICENSE("GPL v2");
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