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