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2024-10-22 8ac6c7a54ed1b98d142dce24b11c6de6a1e239a5 
 kernel/drivers/soc/qcom/cmd-db.c
....@@ -1,13 +1,14 @@
11 /* SPDX-License-Identifier: GPL-2.0 */
2
-/* Copyright (c) 2016-2018, The Linux Foundation. All rights reserved. */
2
+/* Copyright (c) 2016-2018, 2020, The Linux Foundation. All rights reserved. */
33 
4
+#include <linux/debugfs.h>
45 #include <linux/kernel.h>
56 #include <linux/module.h>
67 #include <linux/of.h>
78 #include <linux/of_address.h>
8
-#include <linux/of_platform.h>
99 #include <linux/of_reserved_mem.h>
1010 #include <linux/platform_device.h>
11
+#include <linux/seq_file.h>
1112 #include <linux/types.h>
1213 
1314 #include <soc/qcom/cmd-db.h>
....@@ -102,8 +103,7 @@
102103 
103104 static struct cmd_db_header *cmd_db_header;
104105 
105
-
106
-static inline void *rsc_to_entry_header(struct rsc_hdr *hdr)
106
+static inline const void *rsc_to_entry_header(const struct rsc_hdr *hdr)
107107 {
108108 	u16 offset = le16_to_cpu(hdr->header_offset);
109109 
....@@ -111,7 +111,7 @@
111111 }
112112 
113113 static inline void *
114
-rsc_offset(struct rsc_hdr *hdr, struct entry_header *ent)
114
+rsc_offset(const struct rsc_hdr *hdr, const struct entry_header *ent)
115115 {
116116 	u16 offset = le16_to_cpu(hdr->data_offset);
117117 	u16 loffset = le16_to_cpu(ent->offset);
....@@ -135,20 +135,17 @@
135135 }
136136 EXPORT_SYMBOL(cmd_db_ready);
137137 
138
-static int cmd_db_get_header(const char *id, struct entry_header *eh,
139
-			     struct rsc_hdr *rh)
138
+static int cmd_db_get_header(const char *id, const struct entry_header **eh,
139
+			     const struct rsc_hdr **rh)
140140 {
141
-	struct rsc_hdr *rsc_hdr;
142
-	struct entry_header *ent;
141
+	const struct rsc_hdr *rsc_hdr;
142
+	const struct entry_header *ent;
143143 	int ret, i, j;
144144 	u8 query[8];
145145 
146146 	ret = cmd_db_ready();
147147 	if (ret)
148148 		return ret;
149
-
150
-	if (!eh || !rh)
151
-		return -EINVAL;
152149 
153150 	/* Pad out query string to same length as in DB */
154151 	strncpy(query, id, sizeof(query));
....@@ -160,14 +157,13 @@
160157 
161158 		ent = rsc_to_entry_header(rsc_hdr);
162159 		for (j = 0; j < le16_to_cpu(rsc_hdr->cnt); j++, ent++) {
163
-			if (memcmp(ent->id, query, sizeof(ent->id)) == 0)
164
-				break;
165
-		}
166
-
167
-		if (j < le16_to_cpu(rsc_hdr->cnt)) {
168
-			memcpy(eh, ent, sizeof(*ent));
169
-			memcpy(rh, rsc_hdr, sizeof(*rh));
170
-			return 0;
160
+			if (memcmp(ent->id, query, sizeof(ent->id)) == 0) {
161
+				if (eh)
162
+					*eh = ent;
163
+				if (rh)
164
+					*rh = rsc_hdr;
165
+				return 0;
166
+			}
171167 		}
172168 	}
173169 
....@@ -187,67 +183,38 @@
187183 u32 cmd_db_read_addr(const char *id)
188184 {
189185 	int ret;
190
-	struct entry_header ent;
191
-	struct rsc_hdr rsc_hdr;
186
+	const struct entry_header *ent;
192187 
193
-	ret = cmd_db_get_header(id, &ent, &rsc_hdr);
188
+	ret = cmd_db_get_header(id, &ent, NULL);
194189 
195
-	return ret < 0 ? 0 : le32_to_cpu(ent.addr);
190
+	return ret < 0 ? 0 : le32_to_cpu(ent->addr);
196191 }
197192 EXPORT_SYMBOL(cmd_db_read_addr);
198193 
199194 /**
200195  * cmd_db_read_aux_data() - Query command db for aux data.
201196  *
202
- *  @id: Resource to retrieve AUX Data on.
203
- *  @data: Data buffer to copy returned aux data to. Returns size on NULL
204
- *  @len: Caller provides size of data buffer passed in.
197
+ *  @id: Resource to retrieve AUX Data on
198
+ *  @len: size of data buffer returned
205199  *
206
- *  Return: size of data on success, errno otherwise
200
+ *  Return: pointer to data on success, error pointer otherwise
207201  */
208
-int cmd_db_read_aux_data(const char *id, u8 *data, size_t len)
202
+const void *cmd_db_read_aux_data(const char *id, size_t *len)
209203 {
210204 	int ret;
211
-	struct entry_header ent;
212
-	struct rsc_hdr rsc_hdr;
213
-	u16 ent_len;
214
-
215
-	if (!data)
216
-		return -EINVAL;
205
+	const struct entry_header *ent;
206
+	const struct rsc_hdr *rsc_hdr;
217207 
218208 	ret = cmd_db_get_header(id, &ent, &rsc_hdr);
219209 	if (ret)
220
-		return ret;
210
+		return ERR_PTR(ret);
221211 
222
-	ent_len = le16_to_cpu(ent.len);
223
-	if (len < ent_len)
224
-		return -EINVAL;
212
+	if (len)
213
+		*len = le16_to_cpu(ent->len);
225214 
226
-	len = min_t(u16, ent_len, len);
227
-	memcpy(data, rsc_offset(&rsc_hdr, &ent), len);
228
-
229
-	return len;
215
+	return rsc_offset(rsc_hdr, ent);
230216 }
231217 EXPORT_SYMBOL(cmd_db_read_aux_data);
232
-
233
-/**
234
- * cmd_db_read_aux_data_len - Get the length of the auxiliary data stored in DB.
235
- *
236
- * @id: Resource to retrieve AUX Data.
237
- *
238
- * Return: size on success, 0 on error
239
- */
240
-size_t cmd_db_read_aux_data_len(const char *id)
241
-{
242
-	int ret;
243
-	struct entry_header ent;
244
-	struct rsc_hdr rsc_hdr;
245
-
246
-	ret = cmd_db_get_header(id, &ent, &rsc_hdr);
247
-
248
-	return ret < 0 ? 0 : le16_to_cpu(ent.len);
249
-}
250
-EXPORT_SYMBOL(cmd_db_read_aux_data_len);
251218 
252219 /**
253220  * cmd_db_read_slave_id - Get the slave ID for a given resource address
....@@ -259,18 +226,88 @@
259226 enum cmd_db_hw_type cmd_db_read_slave_id(const char *id)
260227 {
261228 	int ret;
262
-	struct entry_header ent;
263
-	struct rsc_hdr rsc_hdr;
229
+	const struct entry_header *ent;
264230 	u32 addr;
265231 
266
-	ret = cmd_db_get_header(id, &ent, &rsc_hdr);
232
+	ret = cmd_db_get_header(id, &ent, NULL);
267233 	if (ret < 0)
268234 		return CMD_DB_HW_INVALID;
269235 
270
-	addr = le32_to_cpu(ent.addr);
236
+	addr = le32_to_cpu(ent->addr);
271237 	return (addr >> SLAVE_ID_SHIFT) & SLAVE_ID_MASK;
272238 }
273239 EXPORT_SYMBOL(cmd_db_read_slave_id);
240
+
241
+#ifdef CONFIG_DEBUG_FS
242
+static int cmd_db_debugfs_dump(struct seq_file *seq, void *p)
243
+{
244
+	int i, j;
245
+	const struct rsc_hdr *rsc;
246
+	const struct entry_header *ent;
247
+	const char *name;
248
+	u16 len, version;
249
+	u8 major, minor;
250
+
251
+	seq_puts(seq, "Command DB DUMP\n");
252
+
253
+	for (i = 0; i < MAX_SLV_ID; i++) {
254
+		rsc = &cmd_db_header->header[i];
255
+		if (!rsc->slv_id)
256
+			break;
257
+
258
+		switch (le16_to_cpu(rsc->slv_id)) {
259
+		case CMD_DB_HW_ARC:
260
+			name = "ARC";
261
+			break;
262
+		case CMD_DB_HW_VRM:
263
+			name = "VRM";
264
+			break;
265
+		case CMD_DB_HW_BCM:
266
+			name = "BCM";
267
+			break;
268
+		default:
269
+			name = "Unknown";
270
+			break;
271
+		}
272
+
273
+		version = le16_to_cpu(rsc->version);
274
+		major = version >> 8;
275
+		minor = version;
276
+
277
+		seq_printf(seq, "Slave %s (v%u.%u)\n", name, major, minor);
278
+		seq_puts(seq, "-------------------------\n");
279
+
280
+		ent = rsc_to_entry_header(rsc);
281
+		for (j = 0; j < le16_to_cpu(rsc->cnt); j++, ent++) {
282
+			seq_printf(seq, "0x%05x: %*pEp", le32_to_cpu(ent->addr),
283
+				   (int)sizeof(ent->id), ent->id);
284
+
285
+			len = le16_to_cpu(ent->len);
286
+			if (len) {
287
+				seq_printf(seq, " [%*ph]",
288
+					   len, rsc_offset(rsc, ent));
289
+			}
290
+			seq_putc(seq, '\n');
291
+		}
292
+	}
293
+
294
+	return 0;
295
+}
296
+
297
+static int open_cmd_db_debugfs(struct inode *inode, struct file *file)
298
+{
299
+	return single_open(file, cmd_db_debugfs_dump, inode->i_private);
300
+}
301
+#endif
302
+
303
+static const struct file_operations cmd_db_debugfs_ops = {
304
+#ifdef CONFIG_DEBUG_FS
305
+	.open = open_cmd_db_debugfs,
306
+#endif
307
+	.read = seq_read,
308
+	.llseek = seq_lseek,
309
+	.release = single_release,
310
+};
274311 
275312 static int cmd_db_dev_probe(struct platform_device *pdev)
276313 {
....@@ -295,19 +332,23 @@
295332 		return -EINVAL;
296333 	}
297334 
335
+	debugfs_create_file("cmd-db", 0400, NULL, NULL, &cmd_db_debugfs_ops);
336
+
298337 	return 0;
299338 }
300339 
301340 static const struct of_device_id cmd_db_match_table[] = {
302341 	{ .compatible = "qcom,cmd-db" },
303
-	{ },
342
+	{ }
304343 };
344
+MODULE_DEVICE_TABLE(of, cmd_db_match_table);
305345 
306346 static struct platform_driver cmd_db_dev_driver = {
307347 	.probe  = cmd_db_dev_probe,
308348 	.driver = {
309349 		   .name = "cmd-db",
310350 		   .of_match_table = cmd_db_match_table,
351
+		   .suppress_bind_attrs = true,
311352 	},
312353 };
313354 
....@@ -316,5 +357,6 @@
316357 	return platform_driver_register(&cmd_db_dev_driver);
317358 }
318359 arch_initcall(cmd_db_device_init);
319
-MODULE_DESCRIPTION("Qualcomm Command DB");
360
+
361
+MODULE_DESCRIPTION("Qualcomm Technologies, Inc. Command DB Driver");
320362 MODULE_LICENSE("GPL v2");