1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * Copyright (c) 2016-2018, 2020, The Linux Foundation. All rights reserved. 4 * Copyright (c) 2024, Qualcomm Innovation Center, Inc. All rights reserved. 5 */ 6 7 #include <linux/bitfield.h> 8 #include <linux/debugfs.h> 9 #include <linux/kernel.h> 10 #include <linux/module.h> 11 #include <linux/of.h> 12 #include <linux/of_address.h> 13 #include <linux/of_reserved_mem.h> 14 #include <linux/platform_device.h> 15 #include <linux/seq_file.h> 16 #include <linux/types.h> 17 18 #include <soc/qcom/cmd-db.h> 19 20 #define NUM_PRIORITY 2 21 #define MAX_SLV_ID 8 22 #define SLAVE_ID_MASK 0x7 23 #define SLAVE_ID_SHIFT 16 24 #define SLAVE_ID(addr) FIELD_GET(GENMASK(19, 16), addr) 25 #define VRM_ADDR(addr) FIELD_GET(GENMASK(19, 4), addr) 26 27 /** 28 * struct entry_header: header for each entry in cmddb 29 * 30 * @id: resource's identifier 31 * @priority: unused 32 * @addr: the address of the resource 33 * @len: length of the data 34 * @offset: offset from :@data_offset, start of the data 35 */ 36 struct entry_header { 37 u8 id[8]; 38 __le32 priority[NUM_PRIORITY]; 39 __le32 addr; 40 __le16 len; 41 __le16 offset; 42 }; 43 44 /** 45 * struct rsc_hdr: resource header information 46 * 47 * @slv_id: id for the resource 48 * @header_offset: entry's header at offset from the end of the cmd_db_header 49 * @data_offset: entry's data at offset from the end of the cmd_db_header 50 * @cnt: number of entries for HW type 51 * @version: MSB is major, LSB is minor 52 * @reserved: reserved for future use. 53 */ 54 struct rsc_hdr { 55 __le16 slv_id; 56 __le16 header_offset; 57 __le16 data_offset; 58 __le16 cnt; 59 __le16 version; 60 __le16 reserved[3]; 61 }; 62 63 /** 64 * struct cmd_db_header: The DB header information 65 * 66 * @version: The cmd db version 67 * @magic: constant expected in the database 68 * @header: array of resources 69 * @checksum: checksum for the header. Unused. 70 * @reserved: reserved memory 71 * @data: driver specific data 72 */ 73 struct cmd_db_header { 74 __le32 version; 75 u8 magic[4]; 76 struct rsc_hdr header[MAX_SLV_ID]; 77 __le32 checksum; 78 __le32 reserved; 79 u8 data[]; 80 }; 81 82 /** 83 * DOC: Description of the Command DB database. 84 * 85 * At the start of the command DB memory is the cmd_db_header structure. 86 * The cmd_db_header holds the version, checksum, magic key as well as an 87 * array for header for each slave (depicted by the rsc_header). Each h/w 88 * based accelerator is a 'slave' (shared resource) and has slave id indicating 89 * the type of accelerator. The rsc_header is the header for such individual 90 * slaves of a given type. The entries for each of these slaves begin at the 91 * rsc_hdr.header_offset. In addition each slave could have auxiliary data 92 * that may be needed by the driver. The data for the slave starts at the 93 * entry_header.offset to the location pointed to by the rsc_hdr.data_offset. 94 * 95 * Drivers have a stringified key to a slave/resource. They can query the slave 96 * information and get the slave id and the auxiliary data and the length of the 97 * data. Using this information, they can format the request to be sent to the 98 * h/w accelerator and request a resource state. 99 */ 100 101 static const u8 CMD_DB_MAGIC[] = { 0xdb, 0x30, 0x03, 0x0c }; 102 103 static bool cmd_db_magic_matches(const struct cmd_db_header *header) 104 { 105 const u8 *magic = header->magic; 106 107 return memcmp(magic, CMD_DB_MAGIC, ARRAY_SIZE(CMD_DB_MAGIC)) == 0; 108 } 109 110 static struct cmd_db_header *cmd_db_header; 111 112 static inline const void *rsc_to_entry_header(const struct rsc_hdr *hdr) 113 { 114 u16 offset = le16_to_cpu(hdr->header_offset); 115 116 return cmd_db_header->data + offset; 117 } 118 119 static inline void * 120 rsc_offset(const struct rsc_hdr *hdr, const struct entry_header *ent) 121 { 122 u16 offset = le16_to_cpu(hdr->data_offset); 123 u16 loffset = le16_to_cpu(ent->offset); 124 125 return cmd_db_header->data + offset + loffset; 126 } 127 128 /** 129 * cmd_db_ready - Indicates if command DB is available 130 * 131 * Return: 0 on success, errno otherwise 132 */ 133 int cmd_db_ready(void) 134 { 135 if (cmd_db_header == NULL) 136 return -EPROBE_DEFER; 137 else if (!cmd_db_magic_matches(cmd_db_header)) 138 return -EINVAL; 139 140 return 0; 141 } 142 EXPORT_SYMBOL(cmd_db_ready); 143 144 static int cmd_db_get_header(const char *id, const struct entry_header **eh, 145 const struct rsc_hdr **rh) 146 { 147 const struct rsc_hdr *rsc_hdr; 148 const struct entry_header *ent; 149 int ret, i, j; 150 u8 query[sizeof(ent->id)] __nonstring; 151 152 ret = cmd_db_ready(); 153 if (ret) 154 return ret; 155 156 /* 157 * Pad out query string to same length as in DB. NOTE: the output 158 * query string is not necessarily '\0' terminated if it bumps up 159 * against the max size. That's OK and expected. 160 */ 161 strncpy(query, id, sizeof(query)); 162 163 for (i = 0; i < MAX_SLV_ID; i++) { 164 rsc_hdr = &cmd_db_header->header[i]; 165 if (!rsc_hdr->slv_id) 166 break; 167 168 ent = rsc_to_entry_header(rsc_hdr); 169 for (j = 0; j < le16_to_cpu(rsc_hdr->cnt); j++, ent++) { 170 if (memcmp(ent->id, query, sizeof(ent->id)) == 0) { 171 if (eh) 172 *eh = ent; 173 if (rh) 174 *rh = rsc_hdr; 175 return 0; 176 } 177 } 178 } 179 180 return -ENODEV; 181 } 182 183 /** 184 * cmd_db_read_addr() - Query command db for resource id address. 185 * 186 * @id: resource id to query for address 187 * 188 * Return: resource address on success, 0 on error 189 * 190 * This is used to retrieve resource address based on resource 191 * id. 192 */ 193 u32 cmd_db_read_addr(const char *id) 194 { 195 int ret; 196 const struct entry_header *ent; 197 198 ret = cmd_db_get_header(id, &ent, NULL); 199 200 return ret < 0 ? 0 : le32_to_cpu(ent->addr); 201 } 202 EXPORT_SYMBOL(cmd_db_read_addr); 203 204 /** 205 * cmd_db_read_aux_data() - Query command db for aux data. 206 * 207 * @id: Resource to retrieve AUX Data on 208 * @len: size of data buffer returned 209 * 210 * Return: pointer to data on success, error pointer otherwise 211 */ 212 const void *cmd_db_read_aux_data(const char *id, size_t *len) 213 { 214 int ret; 215 const struct entry_header *ent; 216 const struct rsc_hdr *rsc_hdr; 217 218 ret = cmd_db_get_header(id, &ent, &rsc_hdr); 219 if (ret) 220 return ERR_PTR(ret); 221 222 if (len) 223 *len = le16_to_cpu(ent->len); 224 225 return rsc_offset(rsc_hdr, ent); 226 } 227 EXPORT_SYMBOL(cmd_db_read_aux_data); 228 229 /** 230 * cmd_db_match_resource_addr() - Compare if both Resource addresses are same 231 * 232 * @addr1: Resource address to compare 233 * @addr2: Resource address to compare 234 * 235 * Return: true if two addresses refer to the same resource, false otherwise 236 */ 237 bool cmd_db_match_resource_addr(u32 addr1, u32 addr2) 238 { 239 /* 240 * Each RPMh VRM accelerator resource has 3 or 4 contiguous 4-byte 241 * aligned addresses associated with it. Ignore the offset to check 242 * for VRM requests. 243 */ 244 if (addr1 == addr2) 245 return true; 246 else if (SLAVE_ID(addr1) == CMD_DB_HW_VRM && VRM_ADDR(addr1) == VRM_ADDR(addr2)) 247 return true; 248 249 return false; 250 } 251 EXPORT_SYMBOL_GPL(cmd_db_match_resource_addr); 252 253 /** 254 * cmd_db_read_slave_id - Get the slave ID for a given resource address 255 * 256 * @id: Resource id to query the DB for version 257 * 258 * Return: cmd_db_hw_type enum on success, CMD_DB_HW_INVALID on error 259 */ 260 enum cmd_db_hw_type cmd_db_read_slave_id(const char *id) 261 { 262 int ret; 263 const struct entry_header *ent; 264 u32 addr; 265 266 ret = cmd_db_get_header(id, &ent, NULL); 267 if (ret < 0) 268 return CMD_DB_HW_INVALID; 269 270 addr = le32_to_cpu(ent->addr); 271 return (addr >> SLAVE_ID_SHIFT) & SLAVE_ID_MASK; 272 } 273 EXPORT_SYMBOL(cmd_db_read_slave_id); 274 275 #ifdef CONFIG_DEBUG_FS 276 static int cmd_db_debugfs_dump(struct seq_file *seq, void *p) 277 { 278 int i, j; 279 const struct rsc_hdr *rsc; 280 const struct entry_header *ent; 281 const char *name; 282 u16 len, version; 283 u8 major, minor; 284 285 seq_puts(seq, "Command DB DUMP\n"); 286 287 for (i = 0; i < MAX_SLV_ID; i++) { 288 rsc = &cmd_db_header->header[i]; 289 if (!rsc->slv_id) 290 break; 291 292 switch (le16_to_cpu(rsc->slv_id)) { 293 case CMD_DB_HW_ARC: 294 name = "ARC"; 295 break; 296 case CMD_DB_HW_VRM: 297 name = "VRM"; 298 break; 299 case CMD_DB_HW_BCM: 300 name = "BCM"; 301 break; 302 default: 303 name = "Unknown"; 304 break; 305 } 306 307 version = le16_to_cpu(rsc->version); 308 major = version >> 8; 309 minor = version; 310 311 seq_printf(seq, "Slave %s (v%u.%u)\n", name, major, minor); 312 seq_puts(seq, "-------------------------\n"); 313 314 ent = rsc_to_entry_header(rsc); 315 for (j = 0; j < le16_to_cpu(rsc->cnt); j++, ent++) { 316 seq_printf(seq, "0x%05x: %*pEp", le32_to_cpu(ent->addr), 317 (int)strnlen(ent->id, sizeof(ent->id)), ent->id); 318 319 len = le16_to_cpu(ent->len); 320 if (len) { 321 seq_printf(seq, " [%*ph]", 322 len, rsc_offset(rsc, ent)); 323 } 324 seq_putc(seq, '\n'); 325 } 326 } 327 328 return 0; 329 } 330 331 static int open_cmd_db_debugfs(struct inode *inode, struct file *file) 332 { 333 return single_open(file, cmd_db_debugfs_dump, inode->i_private); 334 } 335 #endif 336 337 static const struct file_operations cmd_db_debugfs_ops = { 338 #ifdef CONFIG_DEBUG_FS 339 .open = open_cmd_db_debugfs, 340 #endif 341 .read = seq_read, 342 .llseek = seq_lseek, 343 .release = single_release, 344 }; 345 346 static int cmd_db_dev_probe(struct platform_device *pdev) 347 { 348 struct reserved_mem *rmem; 349 int ret = 0; 350 351 rmem = of_reserved_mem_lookup(pdev->dev.of_node); 352 if (!rmem) { 353 dev_err(&pdev->dev, "failed to acquire memory region\n"); 354 return -EINVAL; 355 } 356 357 cmd_db_header = memremap(rmem->base, rmem->size, MEMREMAP_WC); 358 if (!cmd_db_header) { 359 ret = -ENOMEM; 360 cmd_db_header = NULL; 361 return ret; 362 } 363 364 if (!cmd_db_magic_matches(cmd_db_header)) { 365 dev_err(&pdev->dev, "Invalid Command DB Magic\n"); 366 return -EINVAL; 367 } 368 369 debugfs_create_file("cmd-db", 0400, NULL, NULL, &cmd_db_debugfs_ops); 370 371 device_set_pm_not_required(&pdev->dev); 372 373 return 0; 374 } 375 376 static const struct of_device_id cmd_db_match_table[] = { 377 { .compatible = "qcom,cmd-db" }, 378 { } 379 }; 380 MODULE_DEVICE_TABLE(of, cmd_db_match_table); 381 382 static struct platform_driver cmd_db_dev_driver = { 383 .probe = cmd_db_dev_probe, 384 .driver = { 385 .name = "cmd-db", 386 .of_match_table = cmd_db_match_table, 387 .suppress_bind_attrs = true, 388 }, 389 }; 390 391 static int __init cmd_db_device_init(void) 392 { 393 return platform_driver_register(&cmd_db_dev_driver); 394 } 395 arch_initcall(cmd_db_device_init); 396 397 MODULE_DESCRIPTION("Qualcomm Technologies, Inc. Command DB Driver"); 398 MODULE_LICENSE("GPL v2"); 399