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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * System Control and Management Interface (SCMI) Base Protocol
4 *
5 * Copyright (C) 2018 ARM Ltd.
6 */
7
8#define pr_fmt(fmt) "SCMI Notifications BASE - " fmt
9
10#include <linux/scmi_protocol.h>
11
12#include "common.h"
13#include "notify.h"
14
15#define SCMI_BASE_NUM_SOURCES 1
16#define SCMI_BASE_MAX_CMD_ERR_COUNT 1024
17
18enum scmi_base_protocol_cmd {
19 BASE_DISCOVER_VENDOR = 0x3,
20 BASE_DISCOVER_SUB_VENDOR = 0x4,
21 BASE_DISCOVER_IMPLEMENT_VERSION = 0x5,
22 BASE_DISCOVER_LIST_PROTOCOLS = 0x6,
23 BASE_DISCOVER_AGENT = 0x7,
24 BASE_NOTIFY_ERRORS = 0x8,
25 BASE_SET_DEVICE_PERMISSIONS = 0x9,
26 BASE_SET_PROTOCOL_PERMISSIONS = 0xa,
27 BASE_RESET_AGENT_CONFIGURATION = 0xb,
28};
29
30struct scmi_msg_resp_base_attributes {
31 u8 num_protocols;
32 u8 num_agents;
33 __le16 reserved;
34};
35
36struct scmi_msg_base_error_notify {
37 __le32 event_control;
38#define BASE_TP_NOTIFY_ALL BIT(0)
39};
40
41struct scmi_base_error_notify_payld {
42 __le32 agent_id;
43 __le32 error_status;
44#define IS_FATAL_ERROR(x) ((x) & BIT(31))
45#define ERROR_CMD_COUNT(x) FIELD_GET(GENMASK(9, 0), (x))
46 __le64 msg_reports[SCMI_BASE_MAX_CMD_ERR_COUNT];
47};
48
49/**
50 * scmi_base_attributes_get() - gets the implementation details
51 * that are associated with the base protocol.
52 *
53 * @handle: SCMI entity handle
54 *
55 * Return: 0 on success, else appropriate SCMI error.
56 */
57static int scmi_base_attributes_get(const struct scmi_handle *handle)
58{
59 int ret;
60 struct scmi_xfer *t;
61 struct scmi_msg_resp_base_attributes *attr_info;
62 struct scmi_revision_info *rev = handle->version;
63
64 ret = scmi_xfer_get_init(handle, PROTOCOL_ATTRIBUTES,
65 SCMI_PROTOCOL_BASE, 0, sizeof(*attr_info), &t);
66 if (ret)
67 return ret;
68
69 ret = scmi_do_xfer(handle, t);
70 if (!ret) {
71 attr_info = t->rx.buf;
72 rev->num_protocols = attr_info->num_protocols;
73 rev->num_agents = attr_info->num_agents;
74 }
75
76 scmi_xfer_put(handle, t);
77
78 return ret;
79}
80
81/**
82 * scmi_base_vendor_id_get() - gets vendor/subvendor identifier ASCII string.
83 *
84 * @handle: SCMI entity handle
85 * @sub_vendor: specify true if sub-vendor ID is needed
86 *
87 * Return: 0 on success, else appropriate SCMI error.
88 */
89static int
90scmi_base_vendor_id_get(const struct scmi_handle *handle, bool sub_vendor)
91{
92 u8 cmd;
93 int ret, size;
94 char *vendor_id;
95 struct scmi_xfer *t;
96 struct scmi_revision_info *rev = handle->version;
97
98 if (sub_vendor) {
99 cmd = BASE_DISCOVER_SUB_VENDOR;
100 vendor_id = rev->sub_vendor_id;
101 size = ARRAY_SIZE(rev->sub_vendor_id);
102 } else {
103 cmd = BASE_DISCOVER_VENDOR;
104 vendor_id = rev->vendor_id;
105 size = ARRAY_SIZE(rev->vendor_id);
106 }
107
108 ret = scmi_xfer_get_init(handle, cmd, SCMI_PROTOCOL_BASE, 0, size, &t);
109 if (ret)
110 return ret;
111
112 ret = scmi_do_xfer(handle, t);
113 if (!ret)
114 memcpy(vendor_id, t->rx.buf, size);
115
116 scmi_xfer_put(handle, t);
117
118 return ret;
119}
120
121/**
122 * scmi_base_implementation_version_get() - gets a vendor-specific
123 * implementation 32-bit version. The format of the version number is
124 * vendor-specific
125 *
126 * @handle: SCMI entity handle
127 *
128 * Return: 0 on success, else appropriate SCMI error.
129 */
130static int
131scmi_base_implementation_version_get(const struct scmi_handle *handle)
132{
133 int ret;
134 __le32 *impl_ver;
135 struct scmi_xfer *t;
136 struct scmi_revision_info *rev = handle->version;
137
138 ret = scmi_xfer_get_init(handle, BASE_DISCOVER_IMPLEMENT_VERSION,
139 SCMI_PROTOCOL_BASE, 0, sizeof(*impl_ver), &t);
140 if (ret)
141 return ret;
142
143 ret = scmi_do_xfer(handle, t);
144 if (!ret) {
145 impl_ver = t->rx.buf;
146 rev->impl_ver = le32_to_cpu(*impl_ver);
147 }
148
149 scmi_xfer_put(handle, t);
150
151 return ret;
152}
153
154/**
155 * scmi_base_implementation_list_get() - gets the list of protocols it is
156 * OSPM is allowed to access
157 *
158 * @handle: SCMI entity handle
159 * @protocols_imp: pointer to hold the list of protocol identifiers
160 *
161 * Return: 0 on success, else appropriate SCMI error.
162 */
163static int scmi_base_implementation_list_get(const struct scmi_handle *handle,
164 u8 *protocols_imp)
165{
166 u8 *list;
167 int ret, loop;
168 struct scmi_xfer *t;
169 __le32 *num_skip, *num_ret;
170 u32 tot_num_ret = 0, loop_num_ret;
171 struct device *dev = handle->dev;
172
173 ret = scmi_xfer_get_init(handle, BASE_DISCOVER_LIST_PROTOCOLS,
174 SCMI_PROTOCOL_BASE, sizeof(*num_skip), 0, &t);
175 if (ret)
176 return ret;
177
178 num_skip = t->tx.buf;
179 num_ret = t->rx.buf;
180 list = t->rx.buf + sizeof(*num_ret);
181
182 do {
183 /* Set the number of protocols to be skipped/already read */
184 *num_skip = cpu_to_le32(tot_num_ret);
185
186 ret = scmi_do_xfer(handle, t);
187 if (ret)
188 break;
189
190 loop_num_ret = le32_to_cpu(*num_ret);
191 if (tot_num_ret + loop_num_ret > MAX_PROTOCOLS_IMP) {
192 dev_err(dev, "No. of Protocol > MAX_PROTOCOLS_IMP");
193 break;
194 }
195
196 for (loop = 0; loop < loop_num_ret; loop++)
197 protocols_imp[tot_num_ret + loop] = *(list + loop);
198
199 tot_num_ret += loop_num_ret;
200 } while (loop_num_ret);
201
202 scmi_xfer_put(handle, t);
203
204 return ret;
205}
206
207/**
208 * scmi_base_discover_agent_get() - discover the name of an agent
209 *
210 * @handle: SCMI entity handle
211 * @id: Agent identifier
212 * @name: Agent identifier ASCII string
213 *
214 * An agent id of 0 is reserved to identify the platform itself.
215 * Generally operating system is represented as "OSPM"
216 *
217 * Return: 0 on success, else appropriate SCMI error.
218 */
219static int scmi_base_discover_agent_get(const struct scmi_handle *handle,
220 int id, char *name)
221{
222 int ret;
223 struct scmi_xfer *t;
224
225 ret = scmi_xfer_get_init(handle, BASE_DISCOVER_AGENT,
226 SCMI_PROTOCOL_BASE, sizeof(__le32),
227 SCMI_MAX_STR_SIZE, &t);
228 if (ret)
229 return ret;
230
231 put_unaligned_le32(id, t->tx.buf);
232
233 ret = scmi_do_xfer(handle, t);
234 if (!ret)
235 strlcpy(name, t->rx.buf, SCMI_MAX_STR_SIZE);
236
237 scmi_xfer_put(handle, t);
238
239 return ret;
240}
241
242static int scmi_base_error_notify(const struct scmi_handle *handle, bool enable)
243{
244 int ret;
245 u32 evt_cntl = enable ? BASE_TP_NOTIFY_ALL : 0;
246 struct scmi_xfer *t;
247 struct scmi_msg_base_error_notify *cfg;
248
249 ret = scmi_xfer_get_init(handle, BASE_NOTIFY_ERRORS,
250 SCMI_PROTOCOL_BASE, sizeof(*cfg), 0, &t);
251 if (ret)
252 return ret;
253
254 cfg = t->tx.buf;
255 cfg->event_control = cpu_to_le32(evt_cntl);
256
257 ret = scmi_do_xfer(handle, t);
258
259 scmi_xfer_put(handle, t);
260 return ret;
261}
262
263static int scmi_base_set_notify_enabled(const struct scmi_handle *handle,
264 u8 evt_id, u32 src_id, bool enable)
265{
266 int ret;
267
268 ret = scmi_base_error_notify(handle, enable);
269 if (ret)
270 pr_debug("FAIL_ENABLED - evt[%X] ret:%d\n", evt_id, ret);
271
272 return ret;
273}
274
275static void *scmi_base_fill_custom_report(const struct scmi_handle *handle,
276 u8 evt_id, ktime_t timestamp,
277 const void *payld, size_t payld_sz,
278 void *report, u32 *src_id)
279{
280 int i;
281 const struct scmi_base_error_notify_payld *p = payld;
282 struct scmi_base_error_report *r = report;
283
284 /*
285 * BaseError notification payload is variable in size but
286 * up to a maximum length determined by the struct ponted by p.
287 * Instead payld_sz is the effective length of this notification
288 * payload so cannot be greater of the maximum allowed size as
289 * pointed by p.
290 */
291 if (evt_id != SCMI_EVENT_BASE_ERROR_EVENT || sizeof(*p) < payld_sz)
292 return NULL;
293
294 r->timestamp = timestamp;
295 r->agent_id = le32_to_cpu(p->agent_id);
296 r->fatal = IS_FATAL_ERROR(le32_to_cpu(p->error_status));
297 r->cmd_count = ERROR_CMD_COUNT(le32_to_cpu(p->error_status));
298 for (i = 0; i < r->cmd_count; i++)
299 r->reports[i] = le64_to_cpu(p->msg_reports[i]);
300 *src_id = 0;
301
302 return r;
303}
304
305static const struct scmi_event base_events[] = {
306 {
307 .id = SCMI_EVENT_BASE_ERROR_EVENT,
308 .max_payld_sz = sizeof(struct scmi_base_error_notify_payld),
309 .max_report_sz = sizeof(struct scmi_base_error_report) +
310 SCMI_BASE_MAX_CMD_ERR_COUNT * sizeof(u64),
311 },
312};
313
314static const struct scmi_event_ops base_event_ops = {
315 .set_notify_enabled = scmi_base_set_notify_enabled,
316 .fill_custom_report = scmi_base_fill_custom_report,
317};
318
319int scmi_base_protocol_init(struct scmi_handle *h)
320{
321 int id, ret;
322 u8 *prot_imp;
323 u32 version;
324 char name[SCMI_MAX_STR_SIZE];
325 const struct scmi_handle *handle = h;
326 struct device *dev = handle->dev;
327 struct scmi_revision_info *rev = handle->version;
328
329 ret = scmi_version_get(handle, SCMI_PROTOCOL_BASE, &version);
330 if (ret)
331 return ret;
332
333 prot_imp = devm_kcalloc(dev, MAX_PROTOCOLS_IMP, sizeof(u8), GFP_KERNEL);
334 if (!prot_imp)
335 return -ENOMEM;
336
337 rev->major_ver = PROTOCOL_REV_MAJOR(version),
338 rev->minor_ver = PROTOCOL_REV_MINOR(version);
339
340 scmi_base_attributes_get(handle);
341 scmi_base_vendor_id_get(handle, false);
342 scmi_base_vendor_id_get(handle, true);
343 scmi_base_implementation_version_get(handle);
344 scmi_base_implementation_list_get(handle, prot_imp);
345 scmi_setup_protocol_implemented(handle, prot_imp);
346
347 dev_info(dev, "SCMI Protocol v%d.%d '%s:%s' Firmware version 0x%x\n",
348 rev->major_ver, rev->minor_ver, rev->vendor_id,
349 rev->sub_vendor_id, rev->impl_ver);
350 dev_dbg(dev, "Found %d protocol(s) %d agent(s)\n", rev->num_protocols,
351 rev->num_agents);
352
353 scmi_register_protocol_events(handle, SCMI_PROTOCOL_BASE,
354 (4 * SCMI_PROTO_QUEUE_SZ),
355 &base_event_ops, base_events,
356 ARRAY_SIZE(base_events),
357 SCMI_BASE_NUM_SOURCES);
358
359 for (id = 0; id < rev->num_agents; id++) {
360 scmi_base_discover_agent_get(handle, id, name);
361 dev_dbg(dev, "Agent %d: %s\n", id, name);
362 }
363
364 return 0;
365}