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8#define pr_fmt(fmt) "SCMI Notifications RESET - " fmt
9
10#include <linux/module.h>
11#include <linux/scmi_protocol.h>
12
13#include "common.h"
14#include "notify.h"
15
16enum scmi_reset_protocol_cmd {
17 RESET_DOMAIN_ATTRIBUTES = 0x3,
18 RESET = 0x4,
19 RESET_NOTIFY = 0x5,
20};
21
22#define NUM_RESET_DOMAIN_MASK 0xffff
23#define RESET_NOTIFY_ENABLE BIT(0)
24
25struct scmi_msg_resp_reset_domain_attributes {
26 __le32 attributes;
27#define SUPPORTS_ASYNC_RESET(x) ((x) & BIT(31))
28#define SUPPORTS_NOTIFY_RESET(x) ((x) & BIT(30))
29 __le32 latency;
30 u8 name[SCMI_MAX_STR_SIZE];
31};
32
33struct scmi_msg_reset_domain_reset {
34 __le32 domain_id;
35 __le32 flags;
36#define AUTONOMOUS_RESET BIT(0)
37#define EXPLICIT_RESET_ASSERT BIT(1)
38#define ASYNCHRONOUS_RESET BIT(2)
39 __le32 reset_state;
40#define ARCH_COLD_RESET 0
41};
42
43struct scmi_msg_reset_notify {
44 __le32 id;
45 __le32 event_control;
46#define RESET_TP_NOTIFY_ALL BIT(0)
47};
48
49struct scmi_reset_issued_notify_payld {
50 __le32 agent_id;
51 __le32 domain_id;
52 __le32 reset_state;
53};
54
55struct reset_dom_info {
56 bool async_reset;
57 bool reset_notify;
58 u32 latency_us;
59 char name[SCMI_MAX_STR_SIZE];
60};
61
62struct scmi_reset_info {
63 u32 version;
64 int num_domains;
65 struct reset_dom_info *dom_info;
66};
67
68static int scmi_reset_attributes_get(const struct scmi_protocol_handle *ph,
69 struct scmi_reset_info *pi)
70{
71 int ret;
72 struct scmi_xfer *t;
73 u32 attr;
74
75 ret = ph->xops->xfer_get_init(ph, PROTOCOL_ATTRIBUTES,
76 0, sizeof(attr), &t);
77 if (ret)
78 return ret;
79
80 ret = ph->xops->do_xfer(ph, t);
81 if (!ret) {
82 attr = get_unaligned_le32(t->rx.buf);
83 pi->num_domains = attr & NUM_RESET_DOMAIN_MASK;
84 }
85
86 ph->xops->xfer_put(ph, t);
87 return ret;
88}
89
90static int
91scmi_reset_domain_attributes_get(const struct scmi_protocol_handle *ph,
92 u32 domain, struct reset_dom_info *dom_info)
93{
94 int ret;
95 struct scmi_xfer *t;
96 struct scmi_msg_resp_reset_domain_attributes *attr;
97
98 ret = ph->xops->xfer_get_init(ph, RESET_DOMAIN_ATTRIBUTES,
99 sizeof(domain), sizeof(*attr), &t);
100 if (ret)
101 return ret;
102
103 put_unaligned_le32(domain, t->tx.buf);
104 attr = t->rx.buf;
105
106 ret = ph->xops->do_xfer(ph, t);
107 if (!ret) {
108 u32 attributes = le32_to_cpu(attr->attributes);
109
110 dom_info->async_reset = SUPPORTS_ASYNC_RESET(attributes);
111 dom_info->reset_notify = SUPPORTS_NOTIFY_RESET(attributes);
112 dom_info->latency_us = le32_to_cpu(attr->latency);
113 if (dom_info->latency_us == U32_MAX)
114 dom_info->latency_us = 0;
115 strlcpy(dom_info->name, attr->name, SCMI_MAX_STR_SIZE);
116 }
117
118 ph->xops->xfer_put(ph, t);
119 return ret;
120}
121
122static int scmi_reset_num_domains_get(const struct scmi_protocol_handle *ph)
123{
124 struct scmi_reset_info *pi = ph->get_priv(ph);
125
126 return pi->num_domains;
127}
128
129static char *scmi_reset_name_get(const struct scmi_protocol_handle *ph,
130 u32 domain)
131{
132 struct scmi_reset_info *pi = ph->get_priv(ph);
133
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_protocol_handle *ph,
140 u32 domain)
141{
142 struct scmi_reset_info *pi = ph->get_priv(ph);
143 struct reset_dom_info *dom = pi->dom_info + domain;
144
145 return dom->latency_us;
146}
147
148static int scmi_domain_reset(const struct scmi_protocol_handle *ph, u32 domain,
149 u32 flags, u32 state)
150{
151 int ret;
152 struct scmi_xfer *t;
153 struct scmi_msg_reset_domain_reset *dom;
154 struct scmi_reset_info *pi = ph->get_priv(ph);
155 struct reset_dom_info *rdom = pi->dom_info + domain;
156
157 if (rdom->async_reset)
158 flags |= ASYNCHRONOUS_RESET;
159
160 ret = ph->xops->xfer_get_init(ph, RESET, 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 = ph->xops->do_xfer_with_response(ph, t);
171 else
172 ret = ph->xops->do_xfer(ph, t);
173
174 ph->xops->xfer_put(ph, t);
175 return ret;
176}
177
178static int scmi_reset_domain_reset(const struct scmi_protocol_handle *ph,
179 u32 domain)
180{
181 return scmi_domain_reset(ph, domain, AUTONOMOUS_RESET,
182 ARCH_COLD_RESET);
183}
184
185static int
186scmi_reset_domain_assert(const struct scmi_protocol_handle *ph, u32 domain)
187{
188 return scmi_domain_reset(ph, domain, EXPLICIT_RESET_ASSERT,
189 ARCH_COLD_RESET);
190}
191
192static int
193scmi_reset_domain_deassert(const struct scmi_protocol_handle *ph, u32 domain)
194{
195 return scmi_domain_reset(ph, domain, 0, ARCH_COLD_RESET);
196}
197
198static const struct scmi_reset_proto_ops reset_proto_ops = {
199 .num_domains_get = scmi_reset_num_domains_get,
200 .name_get = scmi_reset_name_get,
201 .latency_get = scmi_reset_latency_get,
202 .reset = scmi_reset_domain_reset,
203 .assert = scmi_reset_domain_assert,
204 .deassert = scmi_reset_domain_deassert,
205};
206
207static int scmi_reset_notify(const struct scmi_protocol_handle *ph,
208 u32 domain_id, bool enable)
209{
210 int ret;
211 u32 evt_cntl = enable ? RESET_TP_NOTIFY_ALL : 0;
212 struct scmi_xfer *t;
213 struct scmi_msg_reset_notify *cfg;
214
215 ret = ph->xops->xfer_get_init(ph, RESET_NOTIFY, 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 = ph->xops->do_xfer(ph, t);
224
225 ph->xops->xfer_put(ph, t);
226 return ret;
227}
228
229static int scmi_reset_set_notify_enabled(const struct scmi_protocol_handle *ph,
230 u8 evt_id, u32 src_id, bool enable)
231{
232 int ret;
233
234 ret = scmi_reset_notify(ph, 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 *
243scmi_reset_fill_custom_report(const struct scmi_protocol_handle *ph,
244 u8 evt_id, ktime_t timestamp,
245 const void *payld, size_t payld_sz,
246 void *report, u32 *src_id)
247{
248 const struct scmi_reset_issued_notify_payld *p = payld;
249 struct scmi_reset_issued_report *r = report;
250
251 if (evt_id != SCMI_EVENT_RESET_ISSUED || sizeof(*p) != payld_sz)
252 return NULL;
253
254 r->timestamp = timestamp;
255 r->agent_id = le32_to_cpu(p->agent_id);
256 r->domain_id = le32_to_cpu(p->domain_id);
257 r->reset_state = le32_to_cpu(p->reset_state);
258 *src_id = r->domain_id;
259
260 return r;
261}
262
263static int scmi_reset_get_num_sources(const struct scmi_protocol_handle *ph)
264{
265 struct scmi_reset_info *pinfo = ph->get_priv(ph);
266
267 if (!pinfo)
268 return -EINVAL;
269
270 return pinfo->num_domains;
271}
272
273static const struct scmi_event reset_events[] = {
274 {
275 .id = SCMI_EVENT_RESET_ISSUED,
276 .max_payld_sz = sizeof(struct scmi_reset_issued_notify_payld),
277 .max_report_sz = sizeof(struct scmi_reset_issued_report),
278 },
279};
280
281static const struct scmi_event_ops reset_event_ops = {
282 .get_num_sources = scmi_reset_get_num_sources,
283 .set_notify_enabled = scmi_reset_set_notify_enabled,
284 .fill_custom_report = scmi_reset_fill_custom_report,
285};
286
287static const struct scmi_protocol_events reset_protocol_events = {
288 .queue_sz = SCMI_PROTO_QUEUE_SZ,
289 .ops = &reset_event_ops,
290 .evts = reset_events,
291 .num_events = ARRAY_SIZE(reset_events),
292};
293
294static int scmi_reset_protocol_init(const struct scmi_protocol_handle *ph)
295{
296 int domain;
297 u32 version;
298 struct scmi_reset_info *pinfo;
299
300 ph->xops->version_get(ph, &version);
301
302 dev_dbg(ph->dev, "Reset Version %d.%d\n",
303 PROTOCOL_REV_MAJOR(version), PROTOCOL_REV_MINOR(version));
304
305 pinfo = devm_kzalloc(ph->dev, sizeof(*pinfo), GFP_KERNEL);
306 if (!pinfo)
307 return -ENOMEM;
308
309 scmi_reset_attributes_get(ph, pinfo);
310
311 pinfo->dom_info = devm_kcalloc(ph->dev, pinfo->num_domains,
312 sizeof(*pinfo->dom_info), GFP_KERNEL);
313 if (!pinfo->dom_info)
314 return -ENOMEM;
315
316 for (domain = 0; domain < pinfo->num_domains; domain++) {
317 struct reset_dom_info *dom = pinfo->dom_info + domain;
318
319 scmi_reset_domain_attributes_get(ph, domain, dom);
320 }
321
322 pinfo->version = version;
323 return ph->set_priv(ph, pinfo);
324}
325
326static const struct scmi_protocol scmi_reset = {
327 .id = SCMI_PROTOCOL_RESET,
328 .owner = THIS_MODULE,
329 .instance_init = &scmi_reset_protocol_init,
330 .ops = &reset_proto_ops,
331 .events = &reset_protocol_events,
332};
333
334DEFINE_SCMI_PROTOCOL_REGISTER_UNREGISTER(reset, scmi_reset)
335
