summaryrefslogtreecommitdiff
path: root/drivers/soc/qcom/cmd-db.c
blob: 629a7188b576fed4c39a8c76fe276f561fb2bd5f (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
366
/* SPDX-License-Identifier: GPL-2.0 */
/* Copyright (c) 2016-2018, 2020, The Linux Foundation. All rights reserved. */

#include <linux/debugfs.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_reserved_mem.h>
#include <linux/platform_device.h>
#include <linux/seq_file.h>
#include <linux/types.h>

#include <soc/qcom/cmd-db.h>

#define NUM_PRIORITY		2
#define MAX_SLV_ID		8
#define SLAVE_ID_MASK		0x7
#define SLAVE_ID_SHIFT		16

/**
 * struct entry_header: header for each entry in cmddb
 *
 * @id: resource's identifier
 * @priority: unused
 * @addr: the address of the resource
 * @len: length of the data
 * @offset: offset from :@data_offset, start of the data
 */
struct entry_header {
	u8 id[8];
	__le32 priority[NUM_PRIORITY];
	__le32 addr;
	__le16 len;
	__le16 offset;
};

/**
 * struct rsc_hdr: resource header information
 *
 * @slv_id: id for the resource
 * @header_offset: entry's header at offset from the end of the cmd_db_header
 * @data_offset: entry's data at offset from the end of the cmd_db_header
 * @cnt: number of entries for HW type
 * @version: MSB is major, LSB is minor
 * @reserved: reserved for future use.
 */
struct rsc_hdr {
	__le16 slv_id;
	__le16 header_offset;
	__le16 data_offset;
	__le16 cnt;
	__le16 version;
	__le16 reserved[3];
};

/**
 * struct cmd_db_header: The DB header information
 *
 * @version: The cmd db version
 * @magic: constant expected in the database
 * @header: array of resources
 * @checksum: checksum for the header. Unused.
 * @reserved: reserved memory
 * @data: driver specific data
 */
struct cmd_db_header {
	__le32 version;
	u8 magic[4];
	struct rsc_hdr header[MAX_SLV_ID];
	__le32 checksum;
	__le32 reserved;
	u8 data[];
};

/**
 * DOC: Description of the Command DB database.
 *
 * At the start of the command DB memory is the cmd_db_header structure.
 * The cmd_db_header holds the version, checksum, magic key as well as an
 * array for header for each slave (depicted by the rsc_header). Each h/w
 * based accelerator is a 'slave' (shared resource) and has slave id indicating
 * the type of accelerator. The rsc_header is the header for such individual
 * slaves of a given type. The entries for each of these slaves begin at the
 * rsc_hdr.header_offset. In addition each slave could have auxiliary data
 * that may be needed by the driver. The data for the slave starts at the
 * entry_header.offset to the location pointed to by the rsc_hdr.data_offset.
 *
 * Drivers have a stringified key to a slave/resource. They can query the slave
 * information and get the slave id and the auxiliary data and the length of the
 * data. Using this information, they can format the request to be sent to the
 * h/w accelerator and request a resource state.
 */

static const u8 CMD_DB_MAGIC[] = { 0xdb, 0x30, 0x03, 0x0c };

static bool cmd_db_magic_matches(const struct cmd_db_header *header)
{
	const u8 *magic = header->magic;

	return memcmp(magic, CMD_DB_MAGIC, ARRAY_SIZE(CMD_DB_MAGIC)) == 0;
}

static struct cmd_db_header *cmd_db_header;

static inline const void *rsc_to_entry_header(const struct rsc_hdr *hdr)
{
	u16 offset = le16_to_cpu(hdr->header_offset);

	return cmd_db_header->data + offset;
}

static inline void *
rsc_offset(const struct rsc_hdr *hdr, const struct entry_header *ent)
{
	u16 offset = le16_to_cpu(hdr->data_offset);
	u16 loffset = le16_to_cpu(ent->offset);

	return cmd_db_header->data + offset + loffset;
}

/**
 * cmd_db_ready - Indicates if command DB is available
 *
 * Return: 0 on success, errno otherwise
 */
int cmd_db_ready(void)
{
	if (cmd_db_header == NULL)
		return -EPROBE_DEFER;
	else if (!cmd_db_magic_matches(cmd_db_header))
		return -EINVAL;

	return 0;
}
EXPORT_SYMBOL(cmd_db_ready);

static int cmd_db_get_header(const char *id, const struct entry_header **eh,
			     const struct rsc_hdr **rh)
{
	const struct rsc_hdr *rsc_hdr;
	const struct entry_header *ent;
	int ret, i, j;
	u8 query[sizeof(ent->id)] __nonstring;

	ret = cmd_db_ready();
	if (ret)
		return ret;

	/*
	 * Pad out query string to same length as in DB. NOTE: the output
	 * query string is not necessarily '\0' terminated if it bumps up
	 * against the max size. That's OK and expected.
	 */
	strncpy(query, id, sizeof(query));

	for (i = 0; i < MAX_SLV_ID; i++) {
		rsc_hdr = &cmd_db_header->header[i];
		if (!rsc_hdr->slv_id)
			break;

		ent = rsc_to_entry_header(rsc_hdr);
		for (j = 0; j < le16_to_cpu(rsc_hdr->cnt); j++, ent++) {
			if (memcmp(ent->id, query, sizeof(ent->id)) == 0) {
				if (eh)
					*eh = ent;
				if (rh)
					*rh = rsc_hdr;
				return 0;
			}
		}
	}

	return -ENODEV;
}

/**
 * cmd_db_read_addr() - Query command db for resource id address.
 *
 * @id: resource id to query for address
 *
 * Return: resource address on success, 0 on error
 *
 * This is used to retrieve resource address based on resource
 * id.
 */
u32 cmd_db_read_addr(const char *id)
{
	int ret;
	const struct entry_header *ent;

	ret = cmd_db_get_header(id, &ent, NULL);

	return ret < 0 ? 0 : le32_to_cpu(ent->addr);
}
EXPORT_SYMBOL(cmd_db_read_addr);

/**
 * cmd_db_read_aux_data() - Query command db for aux data.
 *
 *  @id: Resource to retrieve AUX Data on
 *  @len: size of data buffer returned
 *
 *  Return: pointer to data on success, error pointer otherwise
 */
const void *cmd_db_read_aux_data(const char *id, size_t *len)
{
	int ret;
	const struct entry_header *ent;
	const struct rsc_hdr *rsc_hdr;

	ret = cmd_db_get_header(id, &ent, &rsc_hdr);
	if (ret)
		return ERR_PTR(ret);

	if (len)
		*len = le16_to_cpu(ent->len);

	return rsc_offset(rsc_hdr, ent);
}
EXPORT_SYMBOL(cmd_db_read_aux_data);

/**
 * cmd_db_read_slave_id - Get the slave ID for a given resource address
 *
 * @id: Resource id to query the DB for version
 *
 * Return: cmd_db_hw_type enum on success, CMD_DB_HW_INVALID on error
 */
enum cmd_db_hw_type cmd_db_read_slave_id(const char *id)
{
	int ret;
	const struct entry_header *ent;
	u32 addr;

	ret = cmd_db_get_header(id, &ent, NULL);
	if (ret < 0)
		return CMD_DB_HW_INVALID;

	addr = le32_to_cpu(ent->addr);
	return (addr >> SLAVE_ID_SHIFT) & SLAVE_ID_MASK;
}
EXPORT_SYMBOL(cmd_db_read_slave_id);

#ifdef CONFIG_DEBUG_FS
static int cmd_db_debugfs_dump(struct seq_file *seq, void *p)
{
	int i, j;
	const struct rsc_hdr *rsc;
	const struct entry_header *ent;
	const char *name;
	u16 len, version;
	u8 major, minor;

	seq_puts(seq, "Command DB DUMP\n");

	for (i = 0; i < MAX_SLV_ID; i++) {
		rsc = &cmd_db_header->header[i];
		if (!rsc->slv_id)
			break;

		switch (le16_to_cpu(rsc->slv_id)) {
		case CMD_DB_HW_ARC:
			name = "ARC";
			break;
		case CMD_DB_HW_VRM:
			name = "VRM";
			break;
		case CMD_DB_HW_BCM:
			name = "BCM";
			break;
		default:
			name = "Unknown";
			break;
		}

		version = le16_to_cpu(rsc->version);
		major = version >> 8;
		minor = version;

		seq_printf(seq, "Slave %s (v%u.%u)\n", name, major, minor);
		seq_puts(seq, "-------------------------\n");

		ent = rsc_to_entry_header(rsc);
		for (j = 0; j < le16_to_cpu(rsc->cnt); j++, ent++) {
			seq_printf(seq, "0x%05x: %*pEp", le32_to_cpu(ent->addr),
				   (int)sizeof(ent->id), ent->id);

			len = le16_to_cpu(ent->len);
			if (len) {
				seq_printf(seq, " [%*ph]",
					   len, rsc_offset(rsc, ent));
			}
			seq_putc(seq, '\n');
		}
	}

	return 0;
}

static int open_cmd_db_debugfs(struct inode *inode, struct file *file)
{
	return single_open(file, cmd_db_debugfs_dump, inode->i_private);
}
#endif

static const struct file_operations cmd_db_debugfs_ops = {
#ifdef CONFIG_DEBUG_FS
	.open = open_cmd_db_debugfs,
#endif
	.read = seq_read,
	.llseek = seq_lseek,
	.release = single_release,
};

static int cmd_db_dev_probe(struct platform_device *pdev)
{
	struct reserved_mem *rmem;
	int ret = 0;

	rmem = of_reserved_mem_lookup(pdev->dev.of_node);
	if (!rmem) {
		dev_err(&pdev->dev, "failed to acquire memory region\n");
		return -EINVAL;
	}

	cmd_db_header = memremap(rmem->base, rmem->size, MEMREMAP_WB);
	if (!cmd_db_header) {
		ret = -ENOMEM;
		cmd_db_header = NULL;
		return ret;
	}

	if (!cmd_db_magic_matches(cmd_db_header)) {
		dev_err(&pdev->dev, "Invalid Command DB Magic\n");
		return -EINVAL;
	}

	debugfs_create_file("cmd-db", 0400, NULL, NULL, &cmd_db_debugfs_ops);

	return 0;
}

static const struct of_device_id cmd_db_match_table[] = {
	{ .compatible = "qcom,cmd-db" },
	{ }
};
MODULE_DEVICE_TABLE(of, cmd_db_match_table);

static struct platform_driver cmd_db_dev_driver = {
	.probe  = cmd_db_dev_probe,
	.driver = {
		   .name = "cmd-db",
		   .of_match_table = cmd_db_match_table,
		   .suppress_bind_attrs = true,
	},
};

static int __init cmd_db_device_init(void)
{
	return platform_driver_register(&cmd_db_dev_driver);
}
arch_initcall(cmd_db_device_init);

MODULE_DESCRIPTION("Qualcomm Technologies, Inc. Command DB Driver");
MODULE_LICENSE("GPL v2");