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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * System Control and Management Interface (SCMI) Reset Protocol
4 *
5 * Copyright (C) 2019 ARM Ltd.
6 */
7
8#define pr_fmt(fmt) "SCMI Notifications RESET - " fmt
9
10#include <linux/scmi_protocol.h>
11
12#include "common.h"
13#include "notify.h"
14
15enum scmi_reset_protocol_cmd {
16 RESET_DOMAIN_ATTRIBUTES = 0x3,
17 RESET = 0x4,
18 RESET_NOTIFY = 0x5,
19};
20
21#define NUM_RESET_DOMAIN_MASK 0xffff
22#define RESET_NOTIFY_ENABLE BIT(0)
23
24struct scmi_msg_resp_reset_domain_attributes {
25 __le32 attributes;
26#define SUPPORTS_ASYNC_RESET(x) ((x) & BIT(31))
27#define SUPPORTS_NOTIFY_RESET(x) ((x) & BIT(30))
28 __le32 latency;
29 u8 name[SCMI_MAX_STR_SIZE];
30};
31
32struct scmi_msg_reset_domain_reset {
33 __le32 domain_id;
34 __le32 flags;
35#define AUTONOMOUS_RESET BIT(0)
36#define EXPLICIT_RESET_ASSERT BIT(1)
37#define ASYNCHRONOUS_RESET BIT(2)
38 __le32 reset_state;
39#define ARCH_RESET_TYPE BIT(31)
40#define COLD_RESET_STATE BIT(0)
41#define ARCH_COLD_RESET (ARCH_RESET_TYPE | COLD_RESET_STATE)
42};
43
44struct scmi_msg_reset_notify {
45 __le32 id;
46 __le32 event_control;
47#define RESET_TP_NOTIFY_ALL BIT(0)
48};
49
50struct scmi_reset_issued_notify_payld {
51 __le32 agent_id;
52 __le32 domain_id;
53 __le32 reset_state;
54};
55
56struct reset_dom_info {
57 bool async_reset;
58 bool reset_notify;
59 u32 latency_us;
60 char name[SCMI_MAX_STR_SIZE];
61};
62
63struct scmi_reset_info {
64 u32 version;
65 int num_domains;
66 struct reset_dom_info *dom_info;
67};
68
69static int scmi_reset_attributes_get(const struct scmi_handle *handle,
70 struct scmi_reset_info *pi)
71{
72 int ret;
73 struct scmi_xfer *t;
74 u32 attr;
75
76 ret = scmi_xfer_get_init(handle, PROTOCOL_ATTRIBUTES,
77 SCMI_PROTOCOL_RESET, 0, sizeof(attr), &t);
78 if (ret)
79 return ret;
80
81 ret = scmi_do_xfer(handle, t);
82 if (!ret) {
83 attr = get_unaligned_le32(t->rx.buf);
84 pi->num_domains = attr & NUM_RESET_DOMAIN_MASK;
85 }
86
87 scmi_xfer_put(handle, t);
88 return ret;
89}
90
91static int
92scmi_reset_domain_attributes_get(const struct scmi_handle *handle, u32 domain,
93 struct reset_dom_info *dom_info)
94{
95 int ret;
96 struct scmi_xfer *t;
97 struct scmi_msg_resp_reset_domain_attributes *attr;
98
99 ret = scmi_xfer_get_init(handle, RESET_DOMAIN_ATTRIBUTES,
100 SCMI_PROTOCOL_RESET, sizeof(domain),
101 sizeof(*attr), &t);
102 if (ret)
103 return ret;
104
105 put_unaligned_le32(domain, t->tx.buf);
106 attr = t->rx.buf;
107
108 ret = scmi_do_xfer(handle, t);
109 if (!ret) {
110 u32 attributes = le32_to_cpu(attr->attributes);
111
112 dom_info->async_reset = SUPPORTS_ASYNC_RESET(attributes);
113 dom_info->reset_notify = SUPPORTS_NOTIFY_RESET(attributes);
114 dom_info->latency_us = le32_to_cpu(attr->latency);
115 if (dom_info->latency_us == U32_MAX)
116 dom_info->latency_us = 0;
117 strlcpy(dom_info->name, attr->name, SCMI_MAX_STR_SIZE);
118 }
119
120 scmi_xfer_put(handle, t);
121 return ret;
122}
123
124static int scmi_reset_num_domains_get(const struct scmi_handle *handle)
125{
126 struct scmi_reset_info *pi = handle->reset_priv;
127
128 return pi->num_domains;
129}
130
131static char *scmi_reset_name_get(const struct scmi_handle *handle, u32 domain)
132{
133 struct scmi_reset_info *pi = handle->reset_priv;
134 struct reset_dom_info *dom = pi->dom_info + domain;
135
136 return dom->name;
137}
138
139static int scmi_reset_latency_get(const struct scmi_handle *handle, u32 domain)
140{
141 struct scmi_reset_info *pi = handle->reset_priv;
142 struct reset_dom_info *dom = pi->dom_info + domain;
143
144 return dom->latency_us;
145}
146
147static int scmi_domain_reset(const struct scmi_handle *handle, u32 domain,
148 u32 flags, u32 state)
149{
150 int ret;
151 struct scmi_xfer *t;
152 struct scmi_msg_reset_domain_reset *dom;
153 struct scmi_reset_info *pi = handle->reset_priv;
154 struct reset_dom_info *rdom = pi->dom_info + domain;
155
156 if (rdom->async_reset)
157 flags |= ASYNCHRONOUS_RESET;
158
159 ret = scmi_xfer_get_init(handle, RESET, SCMI_PROTOCOL_RESET,
160 sizeof(*dom), 0, &t);
161 if (ret)
162 return ret;
163
164 dom = t->tx.buf;
165 dom->domain_id = cpu_to_le32(domain);
166 dom->flags = cpu_to_le32(flags);
167 dom->reset_state = cpu_to_le32(state);
168
169 if (rdom->async_reset)
170 ret = scmi_do_xfer_with_response(handle, t);
171 else
172 ret = scmi_do_xfer(handle, t);
173
174 scmi_xfer_put(handle, t);
175 return ret;
176}
177
178static int scmi_reset_domain_reset(const struct scmi_handle *handle, u32 domain)
179{
180 return scmi_domain_reset(handle, domain, AUTONOMOUS_RESET,
181 ARCH_COLD_RESET);
182}
183
184static int
185scmi_reset_domain_assert(const struct scmi_handle *handle, u32 domain)
186{
187 return scmi_domain_reset(handle, domain, EXPLICIT_RESET_ASSERT,
188 ARCH_COLD_RESET);
189}
190
191static int
192scmi_reset_domain_deassert(const struct scmi_handle *handle, u32 domain)
193{
194 return scmi_domain_reset(handle, domain, 0, ARCH_COLD_RESET);
195}
196
197static struct scmi_reset_ops reset_ops = {
198 .num_domains_get = scmi_reset_num_domains_get,
199 .name_get = scmi_reset_name_get,
200 .latency_get = scmi_reset_latency_get,
201 .reset = scmi_reset_domain_reset,
202 .assert = scmi_reset_domain_assert,
203 .deassert = scmi_reset_domain_deassert,
204};
205
206static int scmi_reset_notify(const struct scmi_handle *handle, u32 domain_id,
207 bool enable)
208{
209 int ret;
210 u32 evt_cntl = enable ? RESET_TP_NOTIFY_ALL : 0;
211 struct scmi_xfer *t;
212 struct scmi_msg_reset_notify *cfg;
213
214 ret = scmi_xfer_get_init(handle, RESET_NOTIFY,
215 SCMI_PROTOCOL_RESET, sizeof(*cfg), 0, &t);
216 if (ret)
217 return ret;
218
219 cfg = t->tx.buf;
220 cfg->id = cpu_to_le32(domain_id);
221 cfg->event_control = cpu_to_le32(evt_cntl);
222
223 ret = scmi_do_xfer(handle, t);
224
225 scmi_xfer_put(handle, t);
226 return ret;
227}
228
229static int scmi_reset_set_notify_enabled(const struct scmi_handle *handle,
230 u8 evt_id, u32 src_id, bool enable)
231{
232 int ret;
233
234 ret = scmi_reset_notify(handle, src_id, enable);
235 if (ret)
236 pr_debug("FAIL_ENABLED - evt[%X] dom[%d] - ret:%d\n",
237 evt_id, src_id, ret);
238
239 return ret;
240}
241
242static void *scmi_reset_fill_custom_report(const struct scmi_handle *handle,
243 u8 evt_id, ktime_t timestamp,
244 const void *payld, size_t payld_sz,
245 void *report, u32 *src_id)
246{
247 const struct scmi_reset_issued_notify_payld *p = payld;
248 struct scmi_reset_issued_report *r = report;
249
250 if (evt_id != SCMI_EVENT_RESET_ISSUED || sizeof(*p) != payld_sz)
251 return NULL;
252
253 r->timestamp = timestamp;
254 r->agent_id = le32_to_cpu(p->agent_id);
255 r->domain_id = le32_to_cpu(p->domain_id);
256 r->reset_state = le32_to_cpu(p->reset_state);
257 *src_id = r->domain_id;
258
259 return r;
260}
261
262static const struct scmi_event reset_events[] = {
263 {
264 .id = SCMI_EVENT_RESET_ISSUED,
265 .max_payld_sz = sizeof(struct scmi_reset_issued_notify_payld),
266 .max_report_sz = sizeof(struct scmi_reset_issued_report),
267 },
268};
269
270static const struct scmi_event_ops reset_event_ops = {
271 .set_notify_enabled = scmi_reset_set_notify_enabled,
272 .fill_custom_report = scmi_reset_fill_custom_report,
273};
274
275static int scmi_reset_protocol_init(struct scmi_handle *handle)
276{
277 int domain;
278 u32 version;
279 struct scmi_reset_info *pinfo;
280
281 scmi_version_get(handle, SCMI_PROTOCOL_RESET, &version);
282
283 dev_dbg(handle->dev, "Reset Version %d.%d\n",
284 PROTOCOL_REV_MAJOR(version), PROTOCOL_REV_MINOR(version));
285
286 pinfo = devm_kzalloc(handle->dev, sizeof(*pinfo), GFP_KERNEL);
287 if (!pinfo)
288 return -ENOMEM;
289
290 scmi_reset_attributes_get(handle, pinfo);
291
292 pinfo->dom_info = devm_kcalloc(handle->dev, pinfo->num_domains,
293 sizeof(*pinfo->dom_info), GFP_KERNEL);
294 if (!pinfo->dom_info)
295 return -ENOMEM;
296
297 for (domain = 0; domain < pinfo->num_domains; domain++) {
298 struct reset_dom_info *dom = pinfo->dom_info + domain;
299
300 scmi_reset_domain_attributes_get(handle, domain, dom);
301 }
302
303 scmi_register_protocol_events(handle,
304 SCMI_PROTOCOL_RESET, SCMI_PROTO_QUEUE_SZ,
305 &reset_event_ops, reset_events,
306 ARRAY_SIZE(reset_events),
307 pinfo->num_domains);
308
309 pinfo->version = version;
310 handle->reset_ops = &reset_ops;
311 handle->reset_priv = pinfo;
312
313 return 0;
314}
315
316static int __init scmi_reset_init(void)
317{
318 return scmi_protocol_register(SCMI_PROTOCOL_RESET,
319 &scmi_reset_protocol_init);
320}
321subsys_initcall(scmi_reset_init);
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * System Control and Management Interface (SCMI) Reset Protocol
4 *
5 * Copyright (C) 2019 ARM Ltd.
6 */
7
8#include "common.h"
9
10enum scmi_reset_protocol_cmd {
11 RESET_DOMAIN_ATTRIBUTES = 0x3,
12 RESET = 0x4,
13 RESET_NOTIFY = 0x5,
14};
15
16enum scmi_reset_protocol_notify {
17 RESET_ISSUED = 0x0,
18};
19
20#define NUM_RESET_DOMAIN_MASK 0xffff
21#define RESET_NOTIFY_ENABLE BIT(0)
22
23struct scmi_msg_resp_reset_domain_attributes {
24 __le32 attributes;
25#define SUPPORTS_ASYNC_RESET(x) ((x) & BIT(31))
26#define SUPPORTS_NOTIFY_RESET(x) ((x) & BIT(30))
27 __le32 latency;
28 u8 name[SCMI_MAX_STR_SIZE];
29};
30
31struct scmi_msg_reset_domain_reset {
32 __le32 domain_id;
33 __le32 flags;
34#define AUTONOMOUS_RESET BIT(0)
35#define EXPLICIT_RESET_ASSERT BIT(1)
36#define ASYNCHRONOUS_RESET BIT(2)
37 __le32 reset_state;
38#define ARCH_RESET_TYPE BIT(31)
39#define COLD_RESET_STATE BIT(0)
40#define ARCH_COLD_RESET (ARCH_RESET_TYPE | COLD_RESET_STATE)
41};
42
43struct reset_dom_info {
44 bool async_reset;
45 bool reset_notify;
46 u32 latency_us;
47 char name[SCMI_MAX_STR_SIZE];
48};
49
50struct scmi_reset_info {
51 int num_domains;
52 struct reset_dom_info *dom_info;
53};
54
55static int scmi_reset_attributes_get(const struct scmi_handle *handle,
56 struct scmi_reset_info *pi)
57{
58 int ret;
59 struct scmi_xfer *t;
60 u32 attr;
61
62 ret = scmi_xfer_get_init(handle, PROTOCOL_ATTRIBUTES,
63 SCMI_PROTOCOL_RESET, 0, sizeof(attr), &t);
64 if (ret)
65 return ret;
66
67 ret = scmi_do_xfer(handle, t);
68 if (!ret) {
69 attr = get_unaligned_le32(t->rx.buf);
70 pi->num_domains = attr & NUM_RESET_DOMAIN_MASK;
71 }
72
73 scmi_xfer_put(handle, t);
74 return ret;
75}
76
77static int
78scmi_reset_domain_attributes_get(const struct scmi_handle *handle, u32 domain,
79 struct reset_dom_info *dom_info)
80{
81 int ret;
82 struct scmi_xfer *t;
83 struct scmi_msg_resp_reset_domain_attributes *attr;
84
85 ret = scmi_xfer_get_init(handle, RESET_DOMAIN_ATTRIBUTES,
86 SCMI_PROTOCOL_RESET, sizeof(domain),
87 sizeof(*attr), &t);
88 if (ret)
89 return ret;
90
91 put_unaligned_le32(domain, t->tx.buf);
92 attr = t->rx.buf;
93
94 ret = scmi_do_xfer(handle, t);
95 if (!ret) {
96 u32 attributes = le32_to_cpu(attr->attributes);
97
98 dom_info->async_reset = SUPPORTS_ASYNC_RESET(attributes);
99 dom_info->reset_notify = SUPPORTS_NOTIFY_RESET(attributes);
100 dom_info->latency_us = le32_to_cpu(attr->latency);
101 if (dom_info->latency_us == U32_MAX)
102 dom_info->latency_us = 0;
103 strlcpy(dom_info->name, attr->name, SCMI_MAX_STR_SIZE);
104 }
105
106 scmi_xfer_put(handle, t);
107 return ret;
108}
109
110static int scmi_reset_num_domains_get(const struct scmi_handle *handle)
111{
112 struct scmi_reset_info *pi = handle->reset_priv;
113
114 return pi->num_domains;
115}
116
117static char *scmi_reset_name_get(const struct scmi_handle *handle, u32 domain)
118{
119 struct scmi_reset_info *pi = handle->reset_priv;
120 struct reset_dom_info *dom = pi->dom_info + domain;
121
122 return dom->name;
123}
124
125static int scmi_reset_latency_get(const struct scmi_handle *handle, u32 domain)
126{
127 struct scmi_reset_info *pi = handle->reset_priv;
128 struct reset_dom_info *dom = pi->dom_info + domain;
129
130 return dom->latency_us;
131}
132
133static int scmi_domain_reset(const struct scmi_handle *handle, u32 domain,
134 u32 flags, u32 state)
135{
136 int ret;
137 struct scmi_xfer *t;
138 struct scmi_msg_reset_domain_reset *dom;
139 struct scmi_reset_info *pi = handle->reset_priv;
140 struct reset_dom_info *rdom = pi->dom_info + domain;
141
142 if (rdom->async_reset)
143 flags |= ASYNCHRONOUS_RESET;
144
145 ret = scmi_xfer_get_init(handle, RESET, SCMI_PROTOCOL_RESET,
146 sizeof(*dom), 0, &t);
147 if (ret)
148 return ret;
149
150 dom = t->tx.buf;
151 dom->domain_id = cpu_to_le32(domain);
152 dom->flags = cpu_to_le32(flags);
153 dom->reset_state = cpu_to_le32(state);
154
155 if (rdom->async_reset)
156 ret = scmi_do_xfer_with_response(handle, t);
157 else
158 ret = scmi_do_xfer(handle, t);
159
160 scmi_xfer_put(handle, t);
161 return ret;
162}
163
164static int scmi_reset_domain_reset(const struct scmi_handle *handle, u32 domain)
165{
166 return scmi_domain_reset(handle, domain, AUTONOMOUS_RESET,
167 ARCH_COLD_RESET);
168}
169
170static int
171scmi_reset_domain_assert(const struct scmi_handle *handle, u32 domain)
172{
173 return scmi_domain_reset(handle, domain, EXPLICIT_RESET_ASSERT,
174 ARCH_COLD_RESET);
175}
176
177static int
178scmi_reset_domain_deassert(const struct scmi_handle *handle, u32 domain)
179{
180 return scmi_domain_reset(handle, domain, 0, ARCH_COLD_RESET);
181}
182
183static struct scmi_reset_ops reset_ops = {
184 .num_domains_get = scmi_reset_num_domains_get,
185 .name_get = scmi_reset_name_get,
186 .latency_get = scmi_reset_latency_get,
187 .reset = scmi_reset_domain_reset,
188 .assert = scmi_reset_domain_assert,
189 .deassert = scmi_reset_domain_deassert,
190};
191
192static int scmi_reset_protocol_init(struct scmi_handle *handle)
193{
194 int domain;
195 u32 version;
196 struct scmi_reset_info *pinfo;
197
198 scmi_version_get(handle, SCMI_PROTOCOL_RESET, &version);
199
200 dev_dbg(handle->dev, "Reset Version %d.%d\n",
201 PROTOCOL_REV_MAJOR(version), PROTOCOL_REV_MINOR(version));
202
203 pinfo = devm_kzalloc(handle->dev, sizeof(*pinfo), GFP_KERNEL);
204 if (!pinfo)
205 return -ENOMEM;
206
207 scmi_reset_attributes_get(handle, pinfo);
208
209 pinfo->dom_info = devm_kcalloc(handle->dev, pinfo->num_domains,
210 sizeof(*pinfo->dom_info), GFP_KERNEL);
211 if (!pinfo->dom_info)
212 return -ENOMEM;
213
214 for (domain = 0; domain < pinfo->num_domains; domain++) {
215 struct reset_dom_info *dom = pinfo->dom_info + domain;
216
217 scmi_reset_domain_attributes_get(handle, domain, dom);
218 }
219
220 handle->reset_ops = &reset_ops;
221 handle->reset_priv = pinfo;
222
223 return 0;
224}
225
226static int __init scmi_reset_init(void)
227{
228 return scmi_protocol_register(SCMI_PROTOCOL_RESET,
229 &scmi_reset_protocol_init);
230}
231subsys_initcall(scmi_reset_init);