1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (c) 2016-2017, NVIDIA CORPORATION. All rights reserved
7 #include <linux/platform_device.h>
8 #include <linux/pm_domain.h>
9 #include <linux/slab.h>
11 #include <soc/tegra/bpmp.h>
12 #include <soc/tegra/bpmp-abi.h>
14 struct tegra_powergate_info {
19 struct tegra_powergate {
20 struct generic_pm_domain genpd;
21 struct tegra_bpmp *bpmp;
25 static inline struct tegra_powergate *
26 to_tegra_powergate(struct generic_pm_domain *genpd)
28 return container_of(genpd, struct tegra_powergate, genpd);
31 static int tegra_bpmp_powergate_set_state(struct tegra_bpmp *bpmp,
32 unsigned int id, u32 state)
34 struct mrq_pg_request request;
35 struct tegra_bpmp_message msg;
38 memset(&request, 0, sizeof(request));
39 request.cmd = CMD_PG_SET_STATE;
41 request.set_state.state = state;
43 memset(&msg, 0, sizeof(msg));
45 msg.tx.data = &request;
46 msg.tx.size = sizeof(request);
48 err = tegra_bpmp_transfer(bpmp, &msg);
51 else if (msg.rx.ret < 0)
57 static int tegra_bpmp_powergate_get_state(struct tegra_bpmp *bpmp,
60 struct mrq_pg_response response;
61 struct mrq_pg_request request;
62 struct tegra_bpmp_message msg;
65 memset(&request, 0, sizeof(request));
66 request.cmd = CMD_PG_GET_STATE;
69 memset(&response, 0, sizeof(response));
71 memset(&msg, 0, sizeof(msg));
73 msg.tx.data = &request;
74 msg.tx.size = sizeof(request);
75 msg.rx.data = &response;
76 msg.rx.size = sizeof(response);
78 err = tegra_bpmp_transfer(bpmp, &msg);
81 else if (msg.rx.ret < 0)
84 return response.get_state.state;
87 static int tegra_bpmp_powergate_get_max_id(struct tegra_bpmp *bpmp)
89 struct mrq_pg_response response;
90 struct mrq_pg_request request;
91 struct tegra_bpmp_message msg;
94 memset(&request, 0, sizeof(request));
95 request.cmd = CMD_PG_GET_MAX_ID;
97 memset(&response, 0, sizeof(response));
99 memset(&msg, 0, sizeof(msg));
101 msg.tx.data = &request;
102 msg.tx.size = sizeof(request);
103 msg.rx.data = &response;
104 msg.rx.size = sizeof(response);
106 err = tegra_bpmp_transfer(bpmp, &msg);
109 else if (msg.rx.ret < 0)
112 return response.get_max_id.max_id;
115 static char *tegra_bpmp_powergate_get_name(struct tegra_bpmp *bpmp,
118 struct mrq_pg_response response;
119 struct mrq_pg_request request;
120 struct tegra_bpmp_message msg;
123 memset(&request, 0, sizeof(request));
124 request.cmd = CMD_PG_GET_NAME;
127 memset(&response, 0, sizeof(response));
129 memset(&msg, 0, sizeof(msg));
131 msg.tx.data = &request;
132 msg.tx.size = sizeof(request);
133 msg.rx.data = &response;
134 msg.rx.size = sizeof(response);
136 err = tegra_bpmp_transfer(bpmp, &msg);
137 if (err < 0 || msg.rx.ret < 0)
140 return kstrdup(response.get_name.name, GFP_KERNEL);
143 static inline bool tegra_bpmp_powergate_is_powered(struct tegra_bpmp *bpmp,
146 return tegra_bpmp_powergate_get_state(bpmp, id) != PG_STATE_OFF;
149 static int tegra_powergate_power_on(struct generic_pm_domain *domain)
151 struct tegra_powergate *powergate = to_tegra_powergate(domain);
152 struct tegra_bpmp *bpmp = powergate->bpmp;
154 return tegra_bpmp_powergate_set_state(bpmp, powergate->id,
158 static int tegra_powergate_power_off(struct generic_pm_domain *domain)
160 struct tegra_powergate *powergate = to_tegra_powergate(domain);
161 struct tegra_bpmp *bpmp = powergate->bpmp;
163 return tegra_bpmp_powergate_set_state(bpmp, powergate->id,
167 static struct tegra_powergate *
168 tegra_powergate_add(struct tegra_bpmp *bpmp,
169 const struct tegra_powergate_info *info)
171 struct tegra_powergate *powergate;
175 off = !tegra_bpmp_powergate_is_powered(bpmp, info->id);
177 powergate = devm_kzalloc(bpmp->dev, sizeof(*powergate), GFP_KERNEL);
179 return ERR_PTR(-ENOMEM);
181 powergate->id = info->id;
182 powergate->bpmp = bpmp;
184 powergate->genpd.name = kstrdup(info->name, GFP_KERNEL);
185 powergate->genpd.power_on = tegra_powergate_power_on;
186 powergate->genpd.power_off = tegra_powergate_power_off;
188 err = pm_genpd_init(&powergate->genpd, NULL, off);
190 kfree(powergate->genpd.name);
197 static void tegra_powergate_remove(struct tegra_powergate *powergate)
199 struct generic_pm_domain *genpd = &powergate->genpd;
200 struct tegra_bpmp *bpmp = powergate->bpmp;
203 err = pm_genpd_remove(genpd);
205 dev_err(bpmp->dev, "failed to remove power domain %s: %d\n",
212 tegra_bpmp_probe_powergates(struct tegra_bpmp *bpmp,
213 struct tegra_powergate_info **powergatesp)
215 struct tegra_powergate_info *powergates;
216 unsigned int max_id, id, count = 0;
217 unsigned int num_holes = 0;
220 err = tegra_bpmp_powergate_get_max_id(bpmp);
226 dev_dbg(bpmp->dev, "maximum powergate ID: %u\n", max_id);
228 powergates = kcalloc(max_id + 1, sizeof(*powergates), GFP_KERNEL);
232 for (id = 0; id <= max_id; id++) {
233 struct tegra_powergate_info *info = &powergates[count];
235 info->name = tegra_bpmp_powergate_get_name(bpmp, id);
236 if (!info->name || info->name[0] == '\0') {
245 dev_dbg(bpmp->dev, "holes: %u\n", num_holes);
247 *powergatesp = powergates;
252 static int tegra_bpmp_add_powergates(struct tegra_bpmp *bpmp,
253 struct tegra_powergate_info *powergates,
256 struct genpd_onecell_data *genpd = &bpmp->genpd;
257 struct generic_pm_domain **domains;
258 struct tegra_powergate *powergate;
262 domains = kcalloc(count, sizeof(*domains), GFP_KERNEL);
266 for (i = 0; i < count; i++) {
267 powergate = tegra_powergate_add(bpmp, &powergates[i]);
268 if (IS_ERR(powergate)) {
269 err = PTR_ERR(powergate);
273 dev_dbg(bpmp->dev, "added power domain %s\n",
274 powergate->genpd.name);
275 domains[i] = &powergate->genpd;
278 genpd->num_domains = count;
279 genpd->domains = domains;
285 powergate = to_tegra_powergate(domains[i]);
286 tegra_powergate_remove(powergate);
289 kfree(genpd->domains);
293 static void tegra_bpmp_remove_powergates(struct tegra_bpmp *bpmp)
295 struct genpd_onecell_data *genpd = &bpmp->genpd;
296 unsigned int i = genpd->num_domains;
297 struct tegra_powergate *powergate;
300 dev_dbg(bpmp->dev, "removing power domain %s\n",
301 genpd->domains[i]->name);
302 powergate = to_tegra_powergate(genpd->domains[i]);
303 tegra_powergate_remove(powergate);
307 static struct generic_pm_domain *
308 tegra_powergate_xlate(struct of_phandle_args *spec, void *data)
310 struct generic_pm_domain *domain = ERR_PTR(-ENOENT);
311 struct genpd_onecell_data *genpd = data;
314 for (i = 0; i < genpd->num_domains; i++) {
315 struct tegra_powergate *powergate;
317 powergate = to_tegra_powergate(genpd->domains[i]);
318 if (powergate->id == spec->args[0]) {
319 domain = &powergate->genpd;
327 int tegra_bpmp_init_powergates(struct tegra_bpmp *bpmp)
329 struct device_node *np = bpmp->dev->of_node;
330 struct tegra_powergate_info *powergates;
331 struct device *dev = bpmp->dev;
332 unsigned int count, i;
335 err = tegra_bpmp_probe_powergates(bpmp, &powergates);
341 dev_dbg(dev, "%u power domains probed\n", count);
343 err = tegra_bpmp_add_powergates(bpmp, powergates, count);
347 bpmp->genpd.xlate = tegra_powergate_xlate;
349 err = of_genpd_add_provider_onecell(np, &bpmp->genpd);
351 dev_err(dev, "failed to add power domain provider: %d\n", err);
352 tegra_bpmp_remove_powergates(bpmp);
356 for (i = 0; i < count; i++)
357 kfree(powergates[i].name);