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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * TI SCI Generic Power Domain Driver4 *5 * Copyright (C) 2015-2017 Texas Instruments Incorporated - http://www.ti.com/6 * J Keerthy <j-keerthy@ti.com>7 * Dave Gerlach <d-gerlach@ti.com>8 */9 10#include <linux/err.h>11#include <linux/module.h>12#include <linux/of.h>13#include <linux/platform_device.h>14#include <linux/pm_domain.h>15#include <linux/slab.h>16#include <linux/soc/ti/ti_sci_protocol.h>17#include <dt-bindings/soc/ti,sci_pm_domain.h>18 19/**20 * struct ti_sci_genpd_provider: holds common TI SCI genpd provider data21 * @ti_sci: handle to TI SCI protocol driver that provides ops to22 * communicate with system control processor.23 * @dev: pointer to dev for the driver for devm allocs24 * @pd_list: list of all the power domains on the device25 * @data: onecell data for genpd core26 */27struct ti_sci_genpd_provider {28 const struct ti_sci_handle *ti_sci;29 struct device *dev;30 struct list_head pd_list;31 struct genpd_onecell_data data;32};33 34/**35 * struct ti_sci_pm_domain: TI specific data needed for power domain36 * @idx: index of the device that identifies it with the system37 * control processor.38 * @exclusive: Permissions for exclusive request or shared request of the39 * device.40 * @pd: generic_pm_domain for use with the genpd framework41 * @node: link for the genpd list42 * @parent: link to the parent TI SCI genpd provider43 */44struct ti_sci_pm_domain {45 int idx;46 u8 exclusive;47 struct generic_pm_domain pd;48 struct list_head node;49 struct ti_sci_genpd_provider *parent;50};51 52#define genpd_to_ti_sci_pd(gpd) container_of(gpd, struct ti_sci_pm_domain, pd)53 54/*55 * ti_sci_pd_power_off(): genpd power down hook56 * @domain: pointer to the powerdomain to power off57 */58static int ti_sci_pd_power_off(struct generic_pm_domain *domain)59{60 struct ti_sci_pm_domain *pd = genpd_to_ti_sci_pd(domain);61 const struct ti_sci_handle *ti_sci = pd->parent->ti_sci;62 63 return ti_sci->ops.dev_ops.put_device(ti_sci, pd->idx);64}65 66/*67 * ti_sci_pd_power_on(): genpd power up hook68 * @domain: pointer to the powerdomain to power on69 */70static int ti_sci_pd_power_on(struct generic_pm_domain *domain)71{72 struct ti_sci_pm_domain *pd = genpd_to_ti_sci_pd(domain);73 const struct ti_sci_handle *ti_sci = pd->parent->ti_sci;74 75 if (pd->exclusive)76 return ti_sci->ops.dev_ops.get_device_exclusive(ti_sci,77 pd->idx);78 else79 return ti_sci->ops.dev_ops.get_device(ti_sci, pd->idx);80}81 82/*83 * ti_sci_pd_xlate(): translation service for TI SCI genpds84 * @genpdspec: DT identification data for the genpd85 * @data: genpd core data for all the powerdomains on the device86 */87static struct generic_pm_domain *ti_sci_pd_xlate(88 const struct of_phandle_args *genpdspec,89 void *data)90{91 struct genpd_onecell_data *genpd_data = data;92 unsigned int idx = genpdspec->args[0];93 94 if (genpdspec->args_count != 1 && genpdspec->args_count != 2)95 return ERR_PTR(-EINVAL);96 97 if (idx >= genpd_data->num_domains) {98 pr_err("%s: invalid domain index %u\n", __func__, idx);99 return ERR_PTR(-EINVAL);100 }101 102 if (!genpd_data->domains[idx])103 return ERR_PTR(-ENOENT);104 105 genpd_to_ti_sci_pd(genpd_data->domains[idx])->exclusive =106 genpdspec->args[1];107 108 return genpd_data->domains[idx];109}110 111static const struct of_device_id ti_sci_pm_domain_matches[] = {112 { .compatible = "ti,sci-pm-domain", },113 { },114};115MODULE_DEVICE_TABLE(of, ti_sci_pm_domain_matches);116 117static bool ti_sci_pm_idx_exists(struct ti_sci_genpd_provider *pd_provider, u32 idx)118{119 struct ti_sci_pm_domain *pd;120 121 list_for_each_entry(pd, &pd_provider->pd_list, node) {122 if (pd->idx == idx)123 return true;124 }125 126 return false;127}128 129static int ti_sci_pm_domain_probe(struct platform_device *pdev)130{131 struct device *dev = &pdev->dev;132 struct ti_sci_genpd_provider *pd_provider;133 struct ti_sci_pm_domain *pd;134 struct device_node *np;135 struct of_phandle_args args;136 int ret;137 u32 max_id = 0;138 int index;139 140 pd_provider = devm_kzalloc(dev, sizeof(*pd_provider), GFP_KERNEL);141 if (!pd_provider)142 return -ENOMEM;143 144 pd_provider->ti_sci = devm_ti_sci_get_handle(dev);145 if (IS_ERR(pd_provider->ti_sci))146 return PTR_ERR(pd_provider->ti_sci);147 148 pd_provider->dev = dev;149 150 INIT_LIST_HEAD(&pd_provider->pd_list);151 152 /* Find highest device ID used for power domains */153 for_each_node_with_property(np, "power-domains") {154 index = 0;155 156 while (1) {157 ret = of_parse_phandle_with_args(np, "power-domains",158 "#power-domain-cells",159 index, &args);160 if (ret)161 break;162 163 if (args.args_count >= 1 && args.np == dev->of_node) {164 if (args.args[0] > max_id) {165 max_id = args.args[0];166 } else {167 if (ti_sci_pm_idx_exists(pd_provider, args.args[0])) {168 index++;169 continue;170 }171 }172 173 pd = devm_kzalloc(dev, sizeof(*pd), GFP_KERNEL);174 if (!pd) {175 of_node_put(np);176 return -ENOMEM;177 }178 179 pd->pd.name = devm_kasprintf(dev, GFP_KERNEL,180 "pd:%d",181 args.args[0]);182 if (!pd->pd.name) {183 of_node_put(np);184 return -ENOMEM;185 }186 187 pd->pd.power_off = ti_sci_pd_power_off;188 pd->pd.power_on = ti_sci_pd_power_on;189 pd->idx = args.args[0];190 pd->parent = pd_provider;191 192 pm_genpd_init(&pd->pd, NULL, true);193 194 list_add(&pd->node, &pd_provider->pd_list);195 }196 index++;197 }198 }199 200 pd_provider->data.domains =201 devm_kcalloc(dev, max_id + 1,202 sizeof(*pd_provider->data.domains),203 GFP_KERNEL);204 if (!pd_provider->data.domains)205 return -ENOMEM;206 207 pd_provider->data.num_domains = max_id + 1;208 pd_provider->data.xlate = ti_sci_pd_xlate;209 210 list_for_each_entry(pd, &pd_provider->pd_list, node)211 pd_provider->data.domains[pd->idx] = &pd->pd;212 213 return of_genpd_add_provider_onecell(dev->of_node, &pd_provider->data);214}215 216static struct platform_driver ti_sci_pm_domains_driver = {217 .probe = ti_sci_pm_domain_probe,218 .driver = {219 .name = "ti_sci_pm_domains",220 .of_match_table = ti_sci_pm_domain_matches,221 },222};223module_platform_driver(ti_sci_pm_domains_driver);224MODULE_LICENSE("GPL v2");225MODULE_DESCRIPTION("TI System Control Interface (SCI) Power Domain driver");226MODULE_AUTHOR("Dave Gerlach");227