summaryrefslogtreecommitdiff
path: root/drivers/firmware/arm_scmi/base.c
blob: 9853bd3c4d456b490855a36425935b29378427c6 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
// SPDX-License-Identifier: GPL-2.0
/*
 * System Control and Management Interface (SCMI) Base Protocol
 *
 * Copyright (C) 2018 ARM Ltd.
 */

#define pr_fmt(fmt) "SCMI Notifications BASE - " fmt

#include <linux/scmi_protocol.h>

#include "common.h"
#include "notify.h"

#define SCMI_BASE_NUM_SOURCES		1
#define SCMI_BASE_MAX_CMD_ERR_COUNT	1024

enum scmi_base_protocol_cmd {
	BASE_DISCOVER_VENDOR = 0x3,
	BASE_DISCOVER_SUB_VENDOR = 0x4,
	BASE_DISCOVER_IMPLEMENT_VERSION = 0x5,
	BASE_DISCOVER_LIST_PROTOCOLS = 0x6,
	BASE_DISCOVER_AGENT = 0x7,
	BASE_NOTIFY_ERRORS = 0x8,
	BASE_SET_DEVICE_PERMISSIONS = 0x9,
	BASE_SET_PROTOCOL_PERMISSIONS = 0xa,
	BASE_RESET_AGENT_CONFIGURATION = 0xb,
};

struct scmi_msg_resp_base_attributes {
	u8 num_protocols;
	u8 num_agents;
	__le16 reserved;
};

struct scmi_msg_base_error_notify {
	__le32 event_control;
#define BASE_TP_NOTIFY_ALL	BIT(0)
};

struct scmi_base_error_notify_payld {
	__le32 agent_id;
	__le32 error_status;
#define IS_FATAL_ERROR(x)	((x) & BIT(31))
#define ERROR_CMD_COUNT(x)	FIELD_GET(GENMASK(9, 0), (x))
	__le64 msg_reports[SCMI_BASE_MAX_CMD_ERR_COUNT];
};

/**
 * scmi_base_attributes_get() - gets the implementation details
 *	that are associated with the base protocol.
 *
 * @handle: SCMI entity handle
 *
 * Return: 0 on success, else appropriate SCMI error.
 */
static int scmi_base_attributes_get(const struct scmi_handle *handle)
{
	int ret;
	struct scmi_xfer *t;
	struct scmi_msg_resp_base_attributes *attr_info;
	struct scmi_revision_info *rev = handle->version;

	ret = scmi_xfer_get_init(handle, PROTOCOL_ATTRIBUTES,
				 SCMI_PROTOCOL_BASE, 0, sizeof(*attr_info), &t);
	if (ret)
		return ret;

	ret = scmi_do_xfer(handle, t);
	if (!ret) {
		attr_info = t->rx.buf;
		rev->num_protocols = attr_info->num_protocols;
		rev->num_agents = attr_info->num_agents;
	}

	scmi_xfer_put(handle, t);

	return ret;
}

/**
 * scmi_base_vendor_id_get() - gets vendor/subvendor identifier ASCII string.
 *
 * @handle: SCMI entity handle
 * @sub_vendor: specify true if sub-vendor ID is needed
 *
 * Return: 0 on success, else appropriate SCMI error.
 */
static int
scmi_base_vendor_id_get(const struct scmi_handle *handle, bool sub_vendor)
{
	u8 cmd;
	int ret, size;
	char *vendor_id;
	struct scmi_xfer *t;
	struct scmi_revision_info *rev = handle->version;

	if (sub_vendor) {
		cmd = BASE_DISCOVER_SUB_VENDOR;
		vendor_id = rev->sub_vendor_id;
		size = ARRAY_SIZE(rev->sub_vendor_id);
	} else {
		cmd = BASE_DISCOVER_VENDOR;
		vendor_id = rev->vendor_id;
		size = ARRAY_SIZE(rev->vendor_id);
	}

	ret = scmi_xfer_get_init(handle, cmd, SCMI_PROTOCOL_BASE, 0, size, &t);
	if (ret)
		return ret;

	ret = scmi_do_xfer(handle, t);
	if (!ret)
		memcpy(vendor_id, t->rx.buf, size);

	scmi_xfer_put(handle, t);

	return ret;
}

/**
 * scmi_base_implementation_version_get() - gets a vendor-specific
 *	implementation 32-bit version. The format of the version number is
 *	vendor-specific
 *
 * @handle: SCMI entity handle
 *
 * Return: 0 on success, else appropriate SCMI error.
 */
static int
scmi_base_implementation_version_get(const struct scmi_handle *handle)
{
	int ret;
	__le32 *impl_ver;
	struct scmi_xfer *t;
	struct scmi_revision_info *rev = handle->version;

	ret = scmi_xfer_get_init(handle, BASE_DISCOVER_IMPLEMENT_VERSION,
				 SCMI_PROTOCOL_BASE, 0, sizeof(*impl_ver), &t);
	if (ret)
		return ret;

	ret = scmi_do_xfer(handle, t);
	if (!ret) {
		impl_ver = t->rx.buf;
		rev->impl_ver = le32_to_cpu(*impl_ver);
	}

	scmi_xfer_put(handle, t);

	return ret;
}

/**
 * scmi_base_implementation_list_get() - gets the list of protocols it is
 *	OSPM is allowed to access
 *
 * @handle: SCMI entity handle
 * @protocols_imp: pointer to hold the list of protocol identifiers
 *
 * Return: 0 on success, else appropriate SCMI error.
 */
static int scmi_base_implementation_list_get(const struct scmi_handle *handle,
					     u8 *protocols_imp)
{
	u8 *list;
	int ret, loop;
	struct scmi_xfer *t;
	__le32 *num_skip, *num_ret;
	u32 tot_num_ret = 0, loop_num_ret;
	struct device *dev = handle->dev;

	ret = scmi_xfer_get_init(handle, BASE_DISCOVER_LIST_PROTOCOLS,
				 SCMI_PROTOCOL_BASE, sizeof(*num_skip), 0, &t);
	if (ret)
		return ret;

	num_skip = t->tx.buf;
	num_ret = t->rx.buf;
	list = t->rx.buf + sizeof(*num_ret);

	do {
		/* Set the number of protocols to be skipped/already read */
		*num_skip = cpu_to_le32(tot_num_ret);

		ret = scmi_do_xfer(handle, t);
		if (ret)
			break;

		loop_num_ret = le32_to_cpu(*num_ret);
		if (tot_num_ret + loop_num_ret > MAX_PROTOCOLS_IMP) {
			dev_err(dev, "No. of Protocol > MAX_PROTOCOLS_IMP");
			break;
		}

		for (loop = 0; loop < loop_num_ret; loop++)
			protocols_imp[tot_num_ret + loop] = *(list + loop);

		tot_num_ret += loop_num_ret;
	} while (loop_num_ret);

	scmi_xfer_put(handle, t);

	return ret;
}

/**
 * scmi_base_discover_agent_get() - discover the name of an agent
 *
 * @handle: SCMI entity handle
 * @id: Agent identifier
 * @name: Agent identifier ASCII string
 *
 * An agent id of 0 is reserved to identify the platform itself.
 * Generally operating system is represented as "OSPM"
 *
 * Return: 0 on success, else appropriate SCMI error.
 */
static int scmi_base_discover_agent_get(const struct scmi_handle *handle,
					int id, char *name)
{
	int ret;
	struct scmi_xfer *t;

	ret = scmi_xfer_get_init(handle, BASE_DISCOVER_AGENT,
				 SCMI_PROTOCOL_BASE, sizeof(__le32),
				 SCMI_MAX_STR_SIZE, &t);
	if (ret)
		return ret;

	put_unaligned_le32(id, t->tx.buf);

	ret = scmi_do_xfer(handle, t);
	if (!ret)
		strlcpy(name, t->rx.buf, SCMI_MAX_STR_SIZE);

	scmi_xfer_put(handle, t);

	return ret;
}

static int scmi_base_error_notify(const struct scmi_handle *handle, bool enable)
{
	int ret;
	u32 evt_cntl = enable ? BASE_TP_NOTIFY_ALL : 0;
	struct scmi_xfer *t;
	struct scmi_msg_base_error_notify *cfg;

	ret = scmi_xfer_get_init(handle, BASE_NOTIFY_ERRORS,
				 SCMI_PROTOCOL_BASE, sizeof(*cfg), 0, &t);
	if (ret)
		return ret;

	cfg = t->tx.buf;
	cfg->event_control = cpu_to_le32(evt_cntl);

	ret = scmi_do_xfer(handle, t);

	scmi_xfer_put(handle, t);
	return ret;
}

static int scmi_base_set_notify_enabled(const struct scmi_handle *handle,
					u8 evt_id, u32 src_id, bool enable)
{
	int ret;

	ret = scmi_base_error_notify(handle, enable);
	if (ret)
		pr_debug("FAIL_ENABLED - evt[%X] ret:%d\n", evt_id, ret);

	return ret;
}

static void *scmi_base_fill_custom_report(const struct scmi_handle *handle,
					  u8 evt_id, ktime_t timestamp,
					  const void *payld, size_t payld_sz,
					  void *report, u32 *src_id)
{
	int i;
	const struct scmi_base_error_notify_payld *p = payld;
	struct scmi_base_error_report *r = report;

	/*
	 * BaseError notification payload is variable in size but
	 * up to a maximum length determined by the struct ponted by p.
	 * Instead payld_sz is the effective length of this notification
	 * payload so cannot be greater of the maximum allowed size as
	 * pointed by p.
	 */
	if (evt_id != SCMI_EVENT_BASE_ERROR_EVENT || sizeof(*p) < payld_sz)
		return NULL;

	r->timestamp = timestamp;
	r->agent_id = le32_to_cpu(p->agent_id);
	r->fatal = IS_FATAL_ERROR(le32_to_cpu(p->error_status));
	r->cmd_count = ERROR_CMD_COUNT(le32_to_cpu(p->error_status));
	for (i = 0; i < r->cmd_count; i++)
		r->reports[i] = le64_to_cpu(p->msg_reports[i]);
	*src_id = 0;

	return r;
}

static const struct scmi_event base_events[] = {
	{
		.id = SCMI_EVENT_BASE_ERROR_EVENT,
		.max_payld_sz = sizeof(struct scmi_base_error_notify_payld),
		.max_report_sz = sizeof(struct scmi_base_error_report) +
				  SCMI_BASE_MAX_CMD_ERR_COUNT * sizeof(u64),
	},
};

static const struct scmi_event_ops base_event_ops = {
	.set_notify_enabled = scmi_base_set_notify_enabled,
	.fill_custom_report = scmi_base_fill_custom_report,
};

int scmi_base_protocol_init(struct scmi_handle *h)
{
	int id, ret;
	u8 *prot_imp;
	u32 version;
	char name[SCMI_MAX_STR_SIZE];
	const struct scmi_handle *handle = h;
	struct device *dev = handle->dev;
	struct scmi_revision_info *rev = handle->version;

	ret = scmi_version_get(handle, SCMI_PROTOCOL_BASE, &version);
	if (ret)
		return ret;

	prot_imp = devm_kcalloc(dev, MAX_PROTOCOLS_IMP, sizeof(u8), GFP_KERNEL);
	if (!prot_imp)
		return -ENOMEM;

	rev->major_ver = PROTOCOL_REV_MAJOR(version),
	rev->minor_ver = PROTOCOL_REV_MINOR(version);

	scmi_base_attributes_get(handle);
	scmi_base_vendor_id_get(handle, false);
	scmi_base_vendor_id_get(handle, true);
	scmi_base_implementation_version_get(handle);
	scmi_base_implementation_list_get(handle, prot_imp);
	scmi_setup_protocol_implemented(handle, prot_imp);

	dev_info(dev, "SCMI Protocol v%d.%d '%s:%s' Firmware version 0x%x\n",
		 rev->major_ver, rev->minor_ver, rev->vendor_id,
		 rev->sub_vendor_id, rev->impl_ver);
	dev_dbg(dev, "Found %d protocol(s) %d agent(s)\n", rev->num_protocols,
		rev->num_agents);

	scmi_register_protocol_events(handle, SCMI_PROTOCOL_BASE,
				      (4 * SCMI_PROTO_QUEUE_SZ),
				      &base_event_ops, base_events,
				      ARRAY_SIZE(base_events),
				      SCMI_BASE_NUM_SOURCES);

	for (id = 0; id < rev->num_agents; id++) {
		scmi_base_discover_agent_get(handle, id, name);
		dev_dbg(dev, "Agent %d: %s\n", id, name);
	}

	return 0;
}