205 lines
5.7 KiB
C
205 lines
5.7 KiB
C
/*
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* TI SCI Generic Power Domain Driver
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*
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* Copyright (C) 2015-2017 Texas Instruments Incorporated - http://www.ti.com/
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* J Keerthy <j-keerthy@ti.com>
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* Dave Gerlach <d-gerlach@ti.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/err.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/of.h>
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#include <linux/platform_device.h>
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#include <linux/pm_domain.h>
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#include <linux/slab.h>
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#include <linux/soc/ti/ti_sci_protocol.h>
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/**
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* struct ti_sci_genpd_dev_data: holds data needed for every device attached
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* to this genpd
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* @idx: index of the device that identifies it with the system
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* control processor.
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*/
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struct ti_sci_genpd_dev_data {
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int idx;
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};
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/**
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* struct ti_sci_pm_domain: TI specific data needed for power domain
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* @ti_sci: handle to TI SCI protocol driver that provides ops to
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* communicate with system control processor.
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* @dev: pointer to dev for the driver for devm allocs
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* @pd: generic_pm_domain for use with the genpd framework
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*/
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struct ti_sci_pm_domain {
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const struct ti_sci_handle *ti_sci;
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struct device *dev;
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struct generic_pm_domain pd;
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};
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#define genpd_to_ti_sci_pd(gpd) container_of(gpd, struct ti_sci_pm_domain, pd)
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/**
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* ti_sci_dev_id(): get prepopulated ti_sci id from struct dev
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* @dev: pointer to device associated with this genpd
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*
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* Returns device_id stored from ti,sci_id property
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*/
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static int ti_sci_dev_id(struct device *dev)
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{
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struct generic_pm_domain_data *genpd_data = dev_gpd_data(dev);
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struct ti_sci_genpd_dev_data *sci_dev_data = genpd_data->data;
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return sci_dev_data->idx;
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}
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/**
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* ti_sci_dev_to_sci_handle(): get pointer to ti_sci_handle
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* @dev: pointer to device associated with this genpd
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*
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* Returns ti_sci_handle to be used to communicate with system
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* control processor.
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*/
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static const struct ti_sci_handle *ti_sci_dev_to_sci_handle(struct device *dev)
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{
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struct generic_pm_domain *pd = pd_to_genpd(dev->pm_domain);
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struct ti_sci_pm_domain *ti_sci_genpd = genpd_to_ti_sci_pd(pd);
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return ti_sci_genpd->ti_sci;
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}
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/**
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* ti_sci_dev_start(): genpd device start hook called to turn device on
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* @dev: pointer to device associated with this genpd to be powered on
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*/
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static int ti_sci_dev_start(struct device *dev)
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{
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const struct ti_sci_handle *ti_sci = ti_sci_dev_to_sci_handle(dev);
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int idx = ti_sci_dev_id(dev);
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return ti_sci->ops.dev_ops.get_device(ti_sci, idx);
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}
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/**
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* ti_sci_dev_stop(): genpd device stop hook called to turn device off
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* @dev: pointer to device associated with this genpd to be powered off
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*/
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static int ti_sci_dev_stop(struct device *dev)
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{
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const struct ti_sci_handle *ti_sci = ti_sci_dev_to_sci_handle(dev);
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int idx = ti_sci_dev_id(dev);
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return ti_sci->ops.dev_ops.put_device(ti_sci, idx);
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}
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static int ti_sci_pd_attach_dev(struct generic_pm_domain *domain,
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struct device *dev)
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{
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struct device_node *np = dev->of_node;
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struct of_phandle_args pd_args;
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struct ti_sci_pm_domain *ti_sci_genpd = genpd_to_ti_sci_pd(domain);
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const struct ti_sci_handle *ti_sci = ti_sci_genpd->ti_sci;
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struct ti_sci_genpd_dev_data *sci_dev_data;
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struct generic_pm_domain_data *genpd_data;
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int idx, ret = 0;
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ret = of_parse_phandle_with_args(np, "power-domains",
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"#power-domain-cells", 0, &pd_args);
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if (ret < 0)
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return ret;
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if (pd_args.args_count != 1)
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return -EINVAL;
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idx = pd_args.args[0];
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/*
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* Check the validity of the requested idx, if the index is not valid
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* the PMMC will return a NAK here and we will not allocate it.
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*/
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ret = ti_sci->ops.dev_ops.is_valid(ti_sci, idx);
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if (ret)
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return -EINVAL;
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sci_dev_data = kzalloc(sizeof(*sci_dev_data), GFP_KERNEL);
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if (!sci_dev_data)
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return -ENOMEM;
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sci_dev_data->idx = idx;
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genpd_data = dev_gpd_data(dev);
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genpd_data->data = sci_dev_data;
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return 0;
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}
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static void ti_sci_pd_detach_dev(struct generic_pm_domain *domain,
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struct device *dev)
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{
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struct generic_pm_domain_data *genpd_data = dev_gpd_data(dev);
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struct ti_sci_genpd_dev_data *sci_dev_data = genpd_data->data;
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kfree(sci_dev_data);
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genpd_data->data = NULL;
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}
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static const struct of_device_id ti_sci_pm_domain_matches[] = {
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{ .compatible = "ti,sci-pm-domain", },
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{ },
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};
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MODULE_DEVICE_TABLE(of, ti_sci_pm_domain_matches);
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static int ti_sci_pm_domain_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct device_node *np = dev->of_node;
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struct ti_sci_pm_domain *ti_sci_pd;
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int ret;
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ti_sci_pd = devm_kzalloc(dev, sizeof(*ti_sci_pd), GFP_KERNEL);
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if (!ti_sci_pd)
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return -ENOMEM;
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ti_sci_pd->ti_sci = devm_ti_sci_get_handle(dev);
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if (IS_ERR(ti_sci_pd->ti_sci))
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return PTR_ERR(ti_sci_pd->ti_sci);
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ti_sci_pd->dev = dev;
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ti_sci_pd->pd.name = "ti_sci_pd";
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ti_sci_pd->pd.attach_dev = ti_sci_pd_attach_dev;
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ti_sci_pd->pd.detach_dev = ti_sci_pd_detach_dev;
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ti_sci_pd->pd.dev_ops.start = ti_sci_dev_start;
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ti_sci_pd->pd.dev_ops.stop = ti_sci_dev_stop;
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pm_genpd_init(&ti_sci_pd->pd, NULL, true);
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ret = of_genpd_add_provider_simple(np, &ti_sci_pd->pd);
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return ret;
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}
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static struct platform_driver ti_sci_pm_domains_driver = {
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.probe = ti_sci_pm_domain_probe,
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.driver = {
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.name = "ti_sci_pm_domains",
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.of_match_table = ti_sci_pm_domain_matches,
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},
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};
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module_platform_driver(ti_sci_pm_domains_driver);
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MODULE_LICENSE("GPL v2");
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MODULE_DESCRIPTION("TI System Control Interface (SCI) Power Domain driver");
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MODULE_AUTHOR("Dave Gerlach");
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