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50872a9463
The scmi bus now has support to match the driver with devices not only based on their protocol id but also based on their device name if one is available. This was added to cater the need to support multiple devices and drivers for the same protocol. Let us add the name "genpd" to scmi_device_id table in the driver so that in matches only with device with the same name and protocol id SCMI_PROTOCOL_POWER. Reviewed-by: Cristian Marussi <cristian.marussi@arm.com> Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
130 lines
3.1 KiB
C
130 lines
3.1 KiB
C
// 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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domains[i] = &scmi_pd->genpd;
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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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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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pm_genpd_init(&scmi_pd->genpd, NULL,
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state == SCMI_POWER_STATE_GENERIC_OFF);
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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 <sudeep.holla@arm.com>");
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MODULE_DESCRIPTION("ARM SCMI power domain driver");
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MODULE_LICENSE("GPL v2");
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