Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (c) 2016-2017, NVIDIA CORPORATION. All rights reserved
4 */
5
6#include <linux/of.h>
7#include <linux/platform_device.h>
8#include <linux/pm_domain.h>
9#include <linux/slab.h>
10
11#include <soc/tegra/bpmp.h>
12#include <soc/tegra/bpmp-abi.h>
13
14struct tegra_powergate_info {
15 unsigned int id;
16 char *name;
17};
18
19struct tegra_powergate {
20 struct generic_pm_domain genpd;
21 struct tegra_bpmp *bpmp;
22 unsigned int id;
23};
24
25static inline struct tegra_powergate *
26to_tegra_powergate(struct generic_pm_domain *genpd)
27{
28 return container_of(genpd, struct tegra_powergate, genpd);
29}
30
31static int tegra_bpmp_powergate_set_state(struct tegra_bpmp *bpmp,
32 unsigned int id, u32 state)
33{
34 struct mrq_pg_request request;
35 struct tegra_bpmp_message msg;
36 int err;
37
38 memset(&request, 0, sizeof(request));
39 request.cmd = CMD_PG_SET_STATE;
40 request.id = id;
41 request.set_state.state = state;
42
43 memset(&msg, 0, sizeof(msg));
44 msg.mrq = MRQ_PG;
45 msg.tx.data = &request;
46 msg.tx.size = sizeof(request);
47
48 err = tegra_bpmp_transfer(bpmp, &msg);
49 if (err < 0)
50 return err;
51 else if (msg.rx.ret < 0)
52 return -EINVAL;
53
54 return 0;
55}
56
57static int tegra_bpmp_powergate_get_state(struct tegra_bpmp *bpmp,
58 unsigned int id)
59{
60 struct mrq_pg_response response;
61 struct mrq_pg_request request;
62 struct tegra_bpmp_message msg;
63 int err;
64
65 memset(&request, 0, sizeof(request));
66 request.cmd = CMD_PG_GET_STATE;
67 request.id = id;
68
69 memset(&response, 0, sizeof(response));
70
71 memset(&msg, 0, sizeof(msg));
72 msg.mrq = MRQ_PG;
73 msg.tx.data = &request;
74 msg.tx.size = sizeof(request);
75 msg.rx.data = &response;
76 msg.rx.size = sizeof(response);
77
78 err = tegra_bpmp_transfer(bpmp, &msg);
79 if (err < 0)
80 return PG_STATE_OFF;
81 else if (msg.rx.ret < 0)
82 return -EINVAL;
83
84 return response.get_state.state;
85}
86
87static int tegra_bpmp_powergate_get_max_id(struct tegra_bpmp *bpmp)
88{
89 struct mrq_pg_response response;
90 struct mrq_pg_request request;
91 struct tegra_bpmp_message msg;
92 int err;
93
94 memset(&request, 0, sizeof(request));
95 request.cmd = CMD_PG_GET_MAX_ID;
96
97 memset(&response, 0, sizeof(response));
98
99 memset(&msg, 0, sizeof(msg));
100 msg.mrq = MRQ_PG;
101 msg.tx.data = &request;
102 msg.tx.size = sizeof(request);
103 msg.rx.data = &response;
104 msg.rx.size = sizeof(response);
105
106 err = tegra_bpmp_transfer(bpmp, &msg);
107 if (err < 0)
108 return err;
109 else if (msg.rx.ret < 0)
110 return -EINVAL;
111
112 return response.get_max_id.max_id;
113}
114
115static char *tegra_bpmp_powergate_get_name(struct tegra_bpmp *bpmp,
116 unsigned int id)
117{
118 struct mrq_pg_response response;
119 struct mrq_pg_request request;
120 struct tegra_bpmp_message msg;
121 int err;
122
123 memset(&request, 0, sizeof(request));
124 request.cmd = CMD_PG_GET_NAME;
125 request.id = id;
126
127 memset(&response, 0, sizeof(response));
128
129 memset(&msg, 0, sizeof(msg));
130 msg.mrq = MRQ_PG;
131 msg.tx.data = &request;
132 msg.tx.size = sizeof(request);
133 msg.rx.data = &response;
134 msg.rx.size = sizeof(response);
135
136 err = tegra_bpmp_transfer(bpmp, &msg);
137 if (err < 0 || msg.rx.ret < 0)
138 return NULL;
139
140 return kstrdup(response.get_name.name, GFP_KERNEL);
141}
142
143static inline bool tegra_bpmp_powergate_is_powered(struct tegra_bpmp *bpmp,
144 unsigned int id)
145{
146 return tegra_bpmp_powergate_get_state(bpmp, id) != PG_STATE_OFF;
147}
148
149static int tegra_powergate_power_on(struct generic_pm_domain *domain)
150{
151 struct tegra_powergate *powergate = to_tegra_powergate(domain);
152 struct tegra_bpmp *bpmp = powergate->bpmp;
153
154 return tegra_bpmp_powergate_set_state(bpmp, powergate->id,
155 PG_STATE_ON);
156}
157
158static int tegra_powergate_power_off(struct generic_pm_domain *domain)
159{
160 struct tegra_powergate *powergate = to_tegra_powergate(domain);
161 struct tegra_bpmp *bpmp = powergate->bpmp;
162
163 return tegra_bpmp_powergate_set_state(bpmp, powergate->id,
164 PG_STATE_OFF);
165}
166
167static struct tegra_powergate *
168tegra_powergate_add(struct tegra_bpmp *bpmp,
169 const struct tegra_powergate_info *info)
170{
171 struct tegra_powergate *powergate;
172 bool off;
173 int err;
174
175 off = !tegra_bpmp_powergate_is_powered(bpmp, info->id);
176
177 powergate = devm_kzalloc(bpmp->dev, sizeof(*powergate), GFP_KERNEL);
178 if (!powergate)
179 return ERR_PTR(-ENOMEM);
180
181 powergate->id = info->id;
182 powergate->bpmp = bpmp;
183
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;
187 powergate->genpd.flags = GENPD_FLAG_NO_STAY_ON;
188
189 err = pm_genpd_init(&powergate->genpd, NULL, off);
190 if (err < 0) {
191 kfree(powergate->genpd.name);
192 return ERR_PTR(err);
193 }
194
195 return powergate;
196}
197
198static void tegra_powergate_remove(struct tegra_powergate *powergate)
199{
200 struct generic_pm_domain *genpd = &powergate->genpd;
201 struct tegra_bpmp *bpmp = powergate->bpmp;
202 int err;
203
204 err = pm_genpd_remove(genpd);
205 if (err < 0)
206 dev_err(bpmp->dev, "failed to remove power domain %s: %d\n",
207 genpd->name, err);
208
209 kfree(genpd->name);
210}
211
212static int
213tegra_bpmp_probe_powergates(struct tegra_bpmp *bpmp,
214 struct tegra_powergate_info **powergatesp)
215{
216 struct tegra_powergate_info *powergates;
217 unsigned int max_id, id, count = 0;
218 unsigned int num_holes = 0;
219 int err;
220
221 err = tegra_bpmp_powergate_get_max_id(bpmp);
222 if (err < 0)
223 return err;
224
225 max_id = err;
226
227 dev_dbg(bpmp->dev, "maximum powergate ID: %u\n", max_id);
228
229 powergates = kzalloc_objs(*powergates, max_id + 1);
230 if (!powergates)
231 return -ENOMEM;
232
233 for (id = 0; id <= max_id; id++) {
234 struct tegra_powergate_info *info = &powergates[count];
235
236 info->name = tegra_bpmp_powergate_get_name(bpmp, id);
237 if (!info->name || info->name[0] == '\0') {
238 num_holes++;
239 continue;
240 }
241
242 info->id = id;
243 count++;
244 }
245
246 dev_dbg(bpmp->dev, "holes: %u\n", num_holes);
247
248 *powergatesp = powergates;
249
250 return count;
251}
252
253static int tegra_bpmp_add_powergates(struct tegra_bpmp *bpmp,
254 struct tegra_powergate_info *powergates,
255 unsigned int count)
256{
257 struct genpd_onecell_data *genpd = &bpmp->genpd;
258 struct generic_pm_domain **domains;
259 struct tegra_powergate *powergate;
260 unsigned int i;
261 int err;
262
263 domains = kzalloc_objs(*domains, count);
264 if (!domains)
265 return -ENOMEM;
266
267 for (i = 0; i < count; i++) {
268 powergate = tegra_powergate_add(bpmp, &powergates[i]);
269 if (IS_ERR(powergate)) {
270 err = PTR_ERR(powergate);
271 goto remove;
272 }
273
274 dev_dbg(bpmp->dev, "added power domain %s\n",
275 powergate->genpd.name);
276 domains[i] = &powergate->genpd;
277 }
278
279 genpd->num_domains = count;
280 genpd->domains = domains;
281
282 return 0;
283
284remove:
285 while (i--) {
286 powergate = to_tegra_powergate(domains[i]);
287 tegra_powergate_remove(powergate);
288 }
289
290 kfree(domains);
291 return err;
292}
293
294static void tegra_bpmp_remove_powergates(struct tegra_bpmp *bpmp)
295{
296 struct genpd_onecell_data *genpd = &bpmp->genpd;
297 unsigned int i = genpd->num_domains;
298 struct tegra_powergate *powergate;
299
300 while (i--) {
301 dev_dbg(bpmp->dev, "removing power domain %s\n",
302 genpd->domains[i]->name);
303 powergate = to_tegra_powergate(genpd->domains[i]);
304 tegra_powergate_remove(powergate);
305 }
306}
307
308static struct generic_pm_domain *
309tegra_powergate_xlate(const struct of_phandle_args *spec, void *data)
310{
311 struct generic_pm_domain *domain = ERR_PTR(-ENOENT);
312 struct genpd_onecell_data *genpd = data;
313 unsigned int i;
314
315 for (i = 0; i < genpd->num_domains; i++) {
316 struct tegra_powergate *powergate;
317
318 powergate = to_tegra_powergate(genpd->domains[i]);
319 if (powergate->id == spec->args[0]) {
320 domain = &powergate->genpd;
321 break;
322 }
323 }
324
325 return domain;
326}
327
328int tegra_bpmp_init_powergates(struct tegra_bpmp *bpmp)
329{
330 struct device_node *np = bpmp->dev->of_node;
331 struct tegra_powergate_info *powergates;
332 struct device *dev = bpmp->dev;
333 unsigned int count, i;
334 int err;
335
336 err = tegra_bpmp_probe_powergates(bpmp, &powergates);
337 if (err < 0)
338 return err;
339
340 count = err;
341
342 dev_dbg(dev, "%u power domains probed\n", count);
343
344 err = tegra_bpmp_add_powergates(bpmp, powergates, count);
345 if (err < 0)
346 goto free;
347
348 bpmp->genpd.xlate = tegra_powergate_xlate;
349
350 err = of_genpd_add_provider_onecell(np, &bpmp->genpd);
351 if (err < 0) {
352 dev_err(dev, "failed to add power domain provider: %d\n", err);
353 tegra_bpmp_remove_powergates(bpmp);
354 }
355
356free:
357 for (i = 0; i < count; i++)
358 kfree(powergates[i].name);
359
360 kfree(powergates);
361 return err;
362}