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1/* SPDX-License-Identifier: GPL-2.0 */
2/* Copyright (c) 2016-2018, The Linux Foundation. All rights reserved. */
3
4#include <linux/debugfs.h>
5#include <linux/kernel.h>
6#include <linux/of.h>
7#include <linux/of_address.h>
8#include <linux/of_reserved_mem.h>
9#include <linux/platform_device.h>
10#include <linux/seq_file.h>
11#include <linux/types.h>
12
13#include <soc/qcom/cmd-db.h>
14
15#define NUM_PRIORITY 2
16#define MAX_SLV_ID 8
17#define SLAVE_ID_MASK 0x7
18#define SLAVE_ID_SHIFT 16
19
20/**
21 * struct entry_header: header for each entry in cmddb
22 *
23 * @id: resource's identifier
24 * @priority: unused
25 * @addr: the address of the resource
26 * @len: length of the data
27 * @offset: offset from :@data_offset, start of the data
28 */
29struct entry_header {
30 u8 id[8];
31 __le32 priority[NUM_PRIORITY];
32 __le32 addr;
33 __le16 len;
34 __le16 offset;
35};
36
37/**
38 * struct rsc_hdr: resource header information
39 *
40 * @slv_id: id for the resource
41 * @header_offset: entry's header at offset from the end of the cmd_db_header
42 * @data_offset: entry's data at offset from the end of the cmd_db_header
43 * @cnt: number of entries for HW type
44 * @version: MSB is major, LSB is minor
45 * @reserved: reserved for future use.
46 */
47struct rsc_hdr {
48 __le16 slv_id;
49 __le16 header_offset;
50 __le16 data_offset;
51 __le16 cnt;
52 __le16 version;
53 __le16 reserved[3];
54};
55
56/**
57 * struct cmd_db_header: The DB header information
58 *
59 * @version: The cmd db version
60 * @magic: constant expected in the database
61 * @header: array of resources
62 * @checksum: checksum for the header. Unused.
63 * @reserved: reserved memory
64 * @data: driver specific data
65 */
66struct cmd_db_header {
67 __le32 version;
68 u8 magic[4];
69 struct rsc_hdr header[MAX_SLV_ID];
70 __le32 checksum;
71 __le32 reserved;
72 u8 data[];
73};
74
75/**
76 * DOC: Description of the Command DB database.
77 *
78 * At the start of the command DB memory is the cmd_db_header structure.
79 * The cmd_db_header holds the version, checksum, magic key as well as an
80 * array for header for each slave (depicted by the rsc_header). Each h/w
81 * based accelerator is a 'slave' (shared resource) and has slave id indicating
82 * the type of accelerator. The rsc_header is the header for such individual
83 * slaves of a given type. The entries for each of these slaves begin at the
84 * rsc_hdr.header_offset. In addition each slave could have auxiliary data
85 * that may be needed by the driver. The data for the slave starts at the
86 * entry_header.offset to the location pointed to by the rsc_hdr.data_offset.
87 *
88 * Drivers have a stringified key to a slave/resource. They can query the slave
89 * information and get the slave id and the auxiliary data and the length of the
90 * data. Using this information, they can format the request to be sent to the
91 * h/w accelerator and request a resource state.
92 */
93
94static const u8 CMD_DB_MAGIC[] = { 0xdb, 0x30, 0x03, 0x0c };
95
96static bool cmd_db_magic_matches(const struct cmd_db_header *header)
97{
98 const u8 *magic = header->magic;
99
100 return memcmp(magic, CMD_DB_MAGIC, ARRAY_SIZE(CMD_DB_MAGIC)) == 0;
101}
102
103static struct cmd_db_header *cmd_db_header;
104
105static inline const void *rsc_to_entry_header(const struct rsc_hdr *hdr)
106{
107 u16 offset = le16_to_cpu(hdr->header_offset);
108
109 return cmd_db_header->data + offset;
110}
111
112static inline void *
113rsc_offset(const struct rsc_hdr *hdr, const struct entry_header *ent)
114{
115 u16 offset = le16_to_cpu(hdr->data_offset);
116 u16 loffset = le16_to_cpu(ent->offset);
117
118 return cmd_db_header->data + offset + loffset;
119}
120
121/**
122 * cmd_db_ready - Indicates if command DB is available
123 *
124 * Return: 0 on success, errno otherwise
125 */
126int cmd_db_ready(void)
127{
128 if (cmd_db_header == NULL)
129 return -EPROBE_DEFER;
130 else if (!cmd_db_magic_matches(cmd_db_header))
131 return -EINVAL;
132
133 return 0;
134}
135EXPORT_SYMBOL(cmd_db_ready);
136
137static int cmd_db_get_header(const char *id, const struct entry_header **eh,
138 const struct rsc_hdr **rh)
139{
140 const struct rsc_hdr *rsc_hdr;
141 const struct entry_header *ent;
142 int ret, i, j;
143 u8 query[8];
144
145 ret = cmd_db_ready();
146 if (ret)
147 return ret;
148
149 /* Pad out query string to same length as in DB */
150 strncpy(query, id, sizeof(query));
151
152 for (i = 0; i < MAX_SLV_ID; i++) {
153 rsc_hdr = &cmd_db_header->header[i];
154 if (!rsc_hdr->slv_id)
155 break;
156
157 ent = rsc_to_entry_header(rsc_hdr);
158 for (j = 0; j < le16_to_cpu(rsc_hdr->cnt); j++, ent++) {
159 if (memcmp(ent->id, query, sizeof(ent->id)) == 0) {
160 if (eh)
161 *eh = ent;
162 if (rh)
163 *rh = rsc_hdr;
164 return 0;
165 }
166 }
167 }
168
169 return -ENODEV;
170}
171
172/**
173 * cmd_db_read_addr() - Query command db for resource id address.
174 *
175 * @id: resource id to query for address
176 *
177 * Return: resource address on success, 0 on error
178 *
179 * This is used to retrieve resource address based on resource
180 * id.
181 */
182u32 cmd_db_read_addr(const char *id)
183{
184 int ret;
185 const struct entry_header *ent;
186
187 ret = cmd_db_get_header(id, &ent, NULL);
188
189 return ret < 0 ? 0 : le32_to_cpu(ent->addr);
190}
191EXPORT_SYMBOL(cmd_db_read_addr);
192
193/**
194 * cmd_db_read_aux_data() - Query command db for aux data.
195 *
196 * @id: Resource to retrieve AUX Data on
197 * @len: size of data buffer returned
198 *
199 * Return: pointer to data on success, error pointer otherwise
200 */
201const void *cmd_db_read_aux_data(const char *id, size_t *len)
202{
203 int ret;
204 const struct entry_header *ent;
205 const struct rsc_hdr *rsc_hdr;
206
207 ret = cmd_db_get_header(id, &ent, &rsc_hdr);
208 if (ret)
209 return ERR_PTR(ret);
210
211 if (len)
212 *len = le16_to_cpu(ent->len);
213
214 return rsc_offset(rsc_hdr, ent);
215}
216EXPORT_SYMBOL(cmd_db_read_aux_data);
217
218/**
219 * cmd_db_read_slave_id - Get the slave ID for a given resource address
220 *
221 * @id: Resource id to query the DB for version
222 *
223 * Return: cmd_db_hw_type enum on success, CMD_DB_HW_INVALID on error
224 */
225enum cmd_db_hw_type cmd_db_read_slave_id(const char *id)
226{
227 int ret;
228 const struct entry_header *ent;
229 u32 addr;
230
231 ret = cmd_db_get_header(id, &ent, NULL);
232 if (ret < 0)
233 return CMD_DB_HW_INVALID;
234
235 addr = le32_to_cpu(ent->addr);
236 return (addr >> SLAVE_ID_SHIFT) & SLAVE_ID_MASK;
237}
238EXPORT_SYMBOL(cmd_db_read_slave_id);
239
240#ifdef CONFIG_DEBUG_FS
241static int cmd_db_debugfs_dump(struct seq_file *seq, void *p)
242{
243 int i, j;
244 const struct rsc_hdr *rsc;
245 const struct entry_header *ent;
246 const char *name;
247 u16 len, version;
248 u8 major, minor;
249
250 seq_puts(seq, "Command DB DUMP\n");
251
252 for (i = 0; i < MAX_SLV_ID; i++) {
253 rsc = &cmd_db_header->header[i];
254 if (!rsc->slv_id)
255 break;
256
257 switch (le16_to_cpu(rsc->slv_id)) {
258 case CMD_DB_HW_ARC:
259 name = "ARC";
260 break;
261 case CMD_DB_HW_VRM:
262 name = "VRM";
263 break;
264 case CMD_DB_HW_BCM:
265 name = "BCM";
266 break;
267 default:
268 name = "Unknown";
269 break;
270 }
271
272 version = le16_to_cpu(rsc->version);
273 major = version >> 8;
274 minor = version;
275
276 seq_printf(seq, "Slave %s (v%u.%u)\n", name, major, minor);
277 seq_puts(seq, "-------------------------\n");
278
279 ent = rsc_to_entry_header(rsc);
280 for (j = 0; j < le16_to_cpu(rsc->cnt); j++, ent++) {
281 seq_printf(seq, "0x%05x: %*pEp", le32_to_cpu(ent->addr),
282 (int)sizeof(ent->id), ent->id);
283
284 len = le16_to_cpu(ent->len);
285 if (len) {
286 seq_printf(seq, " [%*ph]",
287 len, rsc_offset(rsc, ent));
288 }
289 seq_putc(seq, '\n');
290 }
291 }
292
293 return 0;
294}
295
296static int open_cmd_db_debugfs(struct inode *inode, struct file *file)
297{
298 return single_open(file, cmd_db_debugfs_dump, inode->i_private);
299}
300#endif
301
302static const struct file_operations cmd_db_debugfs_ops = {
303#ifdef CONFIG_DEBUG_FS
304 .open = open_cmd_db_debugfs,
305#endif
306 .read = seq_read,
307 .llseek = seq_lseek,
308 .release = single_release,
309};
310
311static int cmd_db_dev_probe(struct platform_device *pdev)
312{
313 struct reserved_mem *rmem;
314 int ret = 0;
315
316 rmem = of_reserved_mem_lookup(pdev->dev.of_node);
317 if (!rmem) {
318 dev_err(&pdev->dev, "failed to acquire memory region\n");
319 return -EINVAL;
320 }
321
322 cmd_db_header = memremap(rmem->base, rmem->size, MEMREMAP_WB);
323 if (!cmd_db_header) {
324 ret = -ENOMEM;
325 cmd_db_header = NULL;
326 return ret;
327 }
328
329 if (!cmd_db_magic_matches(cmd_db_header)) {
330 dev_err(&pdev->dev, "Invalid Command DB Magic\n");
331 return -EINVAL;
332 }
333
334 debugfs_create_file("cmd-db", 0400, NULL, NULL, &cmd_db_debugfs_ops);
335
336 return 0;
337}
338
339static const struct of_device_id cmd_db_match_table[] = {
340 { .compatible = "qcom,cmd-db" },
341 { }
342};
343
344static struct platform_driver cmd_db_dev_driver = {
345 .probe = cmd_db_dev_probe,
346 .driver = {
347 .name = "cmd-db",
348 .of_match_table = cmd_db_match_table,
349 },
350};
351
352static int __init cmd_db_device_init(void)
353{
354 return platform_driver_register(&cmd_db_dev_driver);
355}
356arch_initcall(cmd_db_device_init);
1/* SPDX-License-Identifier: GPL-2.0 */
2/* Copyright (c) 2016-2018, The Linux Foundation. All rights reserved. */
3
4#include <linux/kernel.h>
5#include <linux/of.h>
6#include <linux/of_address.h>
7#include <linux/of_platform.h>
8#include <linux/of_reserved_mem.h>
9#include <linux/platform_device.h>
10#include <linux/types.h>
11
12#include <soc/qcom/cmd-db.h>
13
14#define NUM_PRIORITY 2
15#define MAX_SLV_ID 8
16#define SLAVE_ID_MASK 0x7
17#define SLAVE_ID_SHIFT 16
18
19/**
20 * struct entry_header: header for each entry in cmddb
21 *
22 * @id: resource's identifier
23 * @priority: unused
24 * @addr: the address of the resource
25 * @len: length of the data
26 * @offset: offset from :@data_offset, start of the data
27 */
28struct entry_header {
29 u8 id[8];
30 __le32 priority[NUM_PRIORITY];
31 __le32 addr;
32 __le16 len;
33 __le16 offset;
34};
35
36/**
37 * struct rsc_hdr: resource header information
38 *
39 * @slv_id: id for the resource
40 * @header_offset: entry's header at offset from the end of the cmd_db_header
41 * @data_offset: entry's data at offset from the end of the cmd_db_header
42 * @cnt: number of entries for HW type
43 * @version: MSB is major, LSB is minor
44 * @reserved: reserved for future use.
45 */
46struct rsc_hdr {
47 __le16 slv_id;
48 __le16 header_offset;
49 __le16 data_offset;
50 __le16 cnt;
51 __le16 version;
52 __le16 reserved[3];
53};
54
55/**
56 * struct cmd_db_header: The DB header information
57 *
58 * @version: The cmd db version
59 * @magic: constant expected in the database
60 * @header: array of resources
61 * @checksum: checksum for the header. Unused.
62 * @reserved: reserved memory
63 * @data: driver specific data
64 */
65struct cmd_db_header {
66 __le32 version;
67 u8 magic[4];
68 struct rsc_hdr header[MAX_SLV_ID];
69 __le32 checksum;
70 __le32 reserved;
71 u8 data[];
72};
73
74/**
75 * DOC: Description of the Command DB database.
76 *
77 * At the start of the command DB memory is the cmd_db_header structure.
78 * The cmd_db_header holds the version, checksum, magic key as well as an
79 * array for header for each slave (depicted by the rsc_header). Each h/w
80 * based accelerator is a 'slave' (shared resource) and has slave id indicating
81 * the type of accelerator. The rsc_header is the header for such individual
82 * slaves of a given type. The entries for each of these slaves begin at the
83 * rsc_hdr.header_offset. In addition each slave could have auxiliary data
84 * that may be needed by the driver. The data for the slave starts at the
85 * entry_header.offset to the location pointed to by the rsc_hdr.data_offset.
86 *
87 * Drivers have a stringified key to a slave/resource. They can query the slave
88 * information and get the slave id and the auxiliary data and the length of the
89 * data. Using this information, they can format the request to be sent to the
90 * h/w accelerator and request a resource state.
91 */
92
93static const u8 CMD_DB_MAGIC[] = { 0xdb, 0x30, 0x03, 0x0c };
94
95static bool cmd_db_magic_matches(const struct cmd_db_header *header)
96{
97 const u8 *magic = header->magic;
98
99 return memcmp(magic, CMD_DB_MAGIC, ARRAY_SIZE(CMD_DB_MAGIC)) == 0;
100}
101
102static struct cmd_db_header *cmd_db_header;
103
104static inline const void *rsc_to_entry_header(const struct rsc_hdr *hdr)
105{
106 u16 offset = le16_to_cpu(hdr->header_offset);
107
108 return cmd_db_header->data + offset;
109}
110
111static inline void *
112rsc_offset(const struct rsc_hdr *hdr, const struct entry_header *ent)
113{
114 u16 offset = le16_to_cpu(hdr->data_offset);
115 u16 loffset = le16_to_cpu(ent->offset);
116
117 return cmd_db_header->data + offset + loffset;
118}
119
120/**
121 * cmd_db_ready - Indicates if command DB is available
122 *
123 * Return: 0 on success, errno otherwise
124 */
125int cmd_db_ready(void)
126{
127 if (cmd_db_header == NULL)
128 return -EPROBE_DEFER;
129 else if (!cmd_db_magic_matches(cmd_db_header))
130 return -EINVAL;
131
132 return 0;
133}
134EXPORT_SYMBOL(cmd_db_ready);
135
136static int cmd_db_get_header(const char *id, const struct entry_header **eh,
137 const struct rsc_hdr **rh)
138{
139 const struct rsc_hdr *rsc_hdr;
140 const struct entry_header *ent;
141 int ret, i, j;
142 u8 query[8];
143
144 ret = cmd_db_ready();
145 if (ret)
146 return ret;
147
148 /* Pad out query string to same length as in DB */
149 strncpy(query, id, sizeof(query));
150
151 for (i = 0; i < MAX_SLV_ID; i++) {
152 rsc_hdr = &cmd_db_header->header[i];
153 if (!rsc_hdr->slv_id)
154 break;
155
156 ent = rsc_to_entry_header(rsc_hdr);
157 for (j = 0; j < le16_to_cpu(rsc_hdr->cnt); j++, ent++) {
158 if (memcmp(ent->id, query, sizeof(ent->id)) == 0) {
159 if (eh)
160 *eh = ent;
161 if (rh)
162 *rh = rsc_hdr;
163 return 0;
164 }
165 }
166 }
167
168 return -ENODEV;
169}
170
171/**
172 * cmd_db_read_addr() - Query command db for resource id address.
173 *
174 * @id: resource id to query for address
175 *
176 * Return: resource address on success, 0 on error
177 *
178 * This is used to retrieve resource address based on resource
179 * id.
180 */
181u32 cmd_db_read_addr(const char *id)
182{
183 int ret;
184 const struct entry_header *ent;
185
186 ret = cmd_db_get_header(id, &ent, NULL);
187
188 return ret < 0 ? 0 : le32_to_cpu(ent->addr);
189}
190EXPORT_SYMBOL(cmd_db_read_addr);
191
192/**
193 * cmd_db_read_aux_data() - Query command db for aux data.
194 *
195 * @id: Resource to retrieve AUX Data on
196 * @len: size of data buffer returned
197 *
198 * Return: pointer to data on success, error pointer otherwise
199 */
200const void *cmd_db_read_aux_data(const char *id, size_t *len)
201{
202 int ret;
203 const struct entry_header *ent;
204 const struct rsc_hdr *rsc_hdr;
205
206 ret = cmd_db_get_header(id, &ent, &rsc_hdr);
207 if (ret)
208 return ERR_PTR(ret);
209
210 if (len)
211 *len = le16_to_cpu(ent->len);
212
213 return rsc_offset(rsc_hdr, ent);
214}
215EXPORT_SYMBOL(cmd_db_read_aux_data);
216
217/**
218 * cmd_db_read_slave_id - Get the slave ID for a given resource address
219 *
220 * @id: Resource id to query the DB for version
221 *
222 * Return: cmd_db_hw_type enum on success, CMD_DB_HW_INVALID on error
223 */
224enum cmd_db_hw_type cmd_db_read_slave_id(const char *id)
225{
226 int ret;
227 const struct entry_header *ent;
228 u32 addr;
229
230 ret = cmd_db_get_header(id, &ent, NULL);
231 if (ret < 0)
232 return CMD_DB_HW_INVALID;
233
234 addr = le32_to_cpu(ent->addr);
235 return (addr >> SLAVE_ID_SHIFT) & SLAVE_ID_MASK;
236}
237EXPORT_SYMBOL(cmd_db_read_slave_id);
238
239static int cmd_db_dev_probe(struct platform_device *pdev)
240{
241 struct reserved_mem *rmem;
242 int ret = 0;
243
244 rmem = of_reserved_mem_lookup(pdev->dev.of_node);
245 if (!rmem) {
246 dev_err(&pdev->dev, "failed to acquire memory region\n");
247 return -EINVAL;
248 }
249
250 cmd_db_header = memremap(rmem->base, rmem->size, MEMREMAP_WB);
251 if (!cmd_db_header) {
252 ret = -ENOMEM;
253 cmd_db_header = NULL;
254 return ret;
255 }
256
257 if (!cmd_db_magic_matches(cmd_db_header)) {
258 dev_err(&pdev->dev, "Invalid Command DB Magic\n");
259 return -EINVAL;
260 }
261
262 return 0;
263}
264
265static const struct of_device_id cmd_db_match_table[] = {
266 { .compatible = "qcom,cmd-db" },
267 { },
268};
269
270static struct platform_driver cmd_db_dev_driver = {
271 .probe = cmd_db_dev_probe,
272 .driver = {
273 .name = "cmd-db",
274 .of_match_table = cmd_db_match_table,
275 },
276};
277
278static int __init cmd_db_device_init(void)
279{
280 return platform_driver_register(&cmd_db_dev_driver);
281}
282arch_initcall(cmd_db_device_init);