Lina Iyer | 1c5ab79 | 2017-02-01 13:34:54 -0700 | [diff] [blame] | 1 | /* Copyright (c) 2016-2017, The Linux Foundation. All rights reserved. |
Mahesh Sivasubramanian | cb64952 | 2016-08-19 14:04:44 -0600 | [diff] [blame] | 2 | * |
| 3 | * This program is free software; you can redistribute it and/or modify |
| 4 | * it under the terms of the GNU General Public License version 2 and |
| 5 | * only version 2 as published by the Free Software Foundation. |
| 6 | * |
| 7 | * This program is distributed in the hope that it will be useful, |
| 8 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 9 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 10 | * GNU General Public License for more details. |
| 11 | */ |
| 12 | |
| 13 | #include <linux/module.h> |
| 14 | #include <linux/types.h> |
| 15 | #include <linux/platform_device.h> |
| 16 | #include <linux/slab.h> |
| 17 | #include <linux/io.h> |
| 18 | #include <linux/of.h> |
| 19 | #include <linux/of_address.h> |
| 20 | #include <linux/of_platform.h> |
| 21 | #include <linux/kernel.h> |
| 22 | #include <soc/qcom/cmd-db.h> |
| 23 | |
| 24 | #define RESOURCE_ID_LEN 8 |
| 25 | #define NUM_PRIORITY 2 |
| 26 | #define MAX_SLV_ID 8 |
| 27 | #define CMD_DB_MAGIC 0x0C0330DBUL |
| 28 | #define SLAVE_ID_MASK 0x7 |
| 29 | #define SLAVE_ID_SHIFT 16 |
Lina Iyer | 1c5ab79 | 2017-02-01 13:34:54 -0700 | [diff] [blame] | 30 | #define CMD_DB_STANDALONE_MASK BIT(0) |
Mahesh Sivasubramanian | cb64952 | 2016-08-19 14:04:44 -0600 | [diff] [blame] | 31 | |
| 32 | struct entry_header { |
| 33 | uint64_t res_id; |
| 34 | u32 priority[NUM_PRIORITY]; |
| 35 | u32 addr; |
| 36 | u16 len; |
| 37 | u16 offset; |
| 38 | }; |
| 39 | |
| 40 | struct rsc_hdr { |
| 41 | u16 slv_id; |
| 42 | u16 header_offset; /* Entry header offset from data */ |
| 43 | u16 data_offset; /* Entry offset for data location */ |
| 44 | u16 cnt; /* Number of entries for HW type */ |
| 45 | u16 version; /* MSB is Major and LSB is Minor version |
| 46 | * identifies the HW type of Aux Data |
| 47 | */ |
| 48 | u16 reserved[3]; |
| 49 | }; |
| 50 | |
| 51 | struct cmd_db_header { |
| 52 | u32 version; |
| 53 | u32 magic_num; |
| 54 | struct rsc_hdr header[MAX_SLV_ID]; |
| 55 | u32 check_sum; |
| 56 | u32 reserved; |
| 57 | u8 data[]; |
| 58 | }; |
| 59 | |
| 60 | struct cmd_db_entry { |
| 61 | const char resource_id[RESOURCE_ID_LEN + 1]; /* Unique id per entry */ |
| 62 | const u32 addr; /* TCS Addr Slave ID + Offset address */ |
| 63 | const u32 priority[NUM_PRIORITY]; /* Bitmask for DRV IDs */ |
| 64 | u32 len; /* Aux data len */ |
| 65 | u16 version; |
| 66 | u8 data[]; |
| 67 | }; |
| 68 | |
| 69 | /* CMD DB QUERY TYPES */ |
| 70 | enum cmd_db_query_type { |
| 71 | CMD_DB_QUERY_RES_ID = 0, |
| 72 | CMD_DB_QUERY_ADDRESS, |
| 73 | CMD_DB_QUERY_INVALID, |
| 74 | CMD_DB_QUERY_MAX = 0x7ffffff, |
| 75 | }; |
| 76 | |
| 77 | static void __iomem *start_addr; |
| 78 | static struct cmd_db_header *cmd_db_header; |
| 79 | static int cmd_db_status = -EPROBE_DEFER; |
| 80 | |
| 81 | static u64 cmd_db_get_u64_id(const char *id) |
| 82 | { |
| 83 | uint64_t rsc_id = 0; |
| 84 | uint8_t *ch = (uint8_t *)&rsc_id; |
| 85 | int i; |
| 86 | |
| 87 | for (i = 0; ((i < sizeof(rsc_id)) && id[i]); i++) |
| 88 | ch[i] = id[i]; |
| 89 | |
| 90 | return rsc_id; |
| 91 | } |
| 92 | |
| 93 | static int cmd_db_get_header(u64 query, struct entry_header *eh, |
| 94 | struct rsc_hdr *rh, bool use_addr) |
| 95 | { |
| 96 | struct rsc_hdr *rsc_hdr; |
| 97 | int i, j; |
| 98 | |
| 99 | if (!cmd_db_header) |
| 100 | return -EPROBE_DEFER; |
| 101 | |
| 102 | if (!eh || !rh) |
| 103 | return -EINVAL; |
| 104 | |
| 105 | rsc_hdr = &cmd_db_header->header[0]; |
| 106 | |
| 107 | for (i = 0; i < MAX_SLV_ID ; i++, rsc_hdr++) { |
| 108 | struct entry_header *ent; |
| 109 | |
| 110 | if (!rsc_hdr->slv_id) |
| 111 | break; |
| 112 | |
| 113 | ent = (struct entry_header *)(start_addr |
| 114 | + sizeof(*cmd_db_header) |
| 115 | + rsc_hdr->header_offset); |
| 116 | |
| 117 | for (j = 0; j < rsc_hdr->cnt; j++, ent++) { |
| 118 | if (use_addr) { |
| 119 | if (ent->addr == (u32)(query)) |
| 120 | break; |
| 121 | } else if (ent->res_id == query) |
| 122 | break; |
| 123 | } |
| 124 | |
| 125 | if (j < rsc_hdr->cnt) { |
| 126 | memcpy(eh, ent, sizeof(*ent)); |
| 127 | memcpy(rh, &cmd_db_header->header[i], sizeof(*rh)); |
| 128 | return 0; |
| 129 | } |
| 130 | } |
| 131 | return -ENODEV; |
| 132 | } |
| 133 | |
| 134 | static int cmd_db_get_header_by_addr(u32 addr, |
| 135 | struct entry_header *ent_hdr, |
| 136 | struct rsc_hdr *rsc_hdr) |
| 137 | { |
| 138 | return cmd_db_get_header((u64)addr, ent_hdr, rsc_hdr, true); |
| 139 | } |
| 140 | |
| 141 | static int cmd_db_get_header_by_rsc_id(const char *resource_id, |
| 142 | struct entry_header *ent_hdr, |
| 143 | struct rsc_hdr *rsc_hdr) |
| 144 | { |
| 145 | u64 rsc_id = cmd_db_get_u64_id(resource_id); |
| 146 | |
| 147 | return cmd_db_get_header(rsc_id, ent_hdr, rsc_hdr, false); |
| 148 | } |
| 149 | |
| 150 | u32 cmd_db_get_addr(const char *resource_id) |
| 151 | { |
| 152 | int ret; |
| 153 | struct entry_header ent; |
| 154 | struct rsc_hdr rsc_hdr; |
| 155 | |
| 156 | ret = cmd_db_get_header_by_rsc_id(resource_id, &ent, &rsc_hdr); |
| 157 | |
| 158 | return ret < 0 ? 0 : ent.addr; |
| 159 | } |
| 160 | |
| 161 | bool cmd_db_get_priority(u32 addr, u8 drv_id) |
| 162 | { |
| 163 | int ret; |
| 164 | struct entry_header ent; |
| 165 | struct rsc_hdr rsc_hdr; |
| 166 | |
| 167 | ret = cmd_db_get_header_by_addr(addr, &ent, &rsc_hdr); |
| 168 | |
| 169 | return ret < 0 ? false : (bool)(ent.priority[0] & (1 << drv_id)); |
| 170 | |
| 171 | } |
| 172 | int cmd_db_get_aux_data(const char *resource_id, u8 *data, int len) |
| 173 | { |
| 174 | int ret; |
| 175 | struct entry_header ent; |
| 176 | struct rsc_hdr rsc_hdr; |
| 177 | |
| 178 | if (!data) |
| 179 | return -EINVAL; |
| 180 | |
| 181 | ret = cmd_db_get_header_by_rsc_id(resource_id, &ent, &rsc_hdr); |
| 182 | |
| 183 | if (ret) |
| 184 | return ret; |
| 185 | |
| 186 | if (ent.len < len) |
| 187 | return -EINVAL; |
| 188 | |
| 189 | len = (ent.len < len) ? ent.len : len; |
| 190 | |
| 191 | memcpy_fromio(data, |
| 192 | start_addr + sizeof(*cmd_db_header) |
| 193 | + rsc_hdr.data_offset + ent.offset, |
| 194 | len); |
| 195 | return len; |
| 196 | } |
| 197 | |
| 198 | int cmd_db_get_aux_data_len(const char *resource_id) |
| 199 | { |
| 200 | int ret; |
| 201 | struct entry_header ent; |
| 202 | struct rsc_hdr rsc_hdr; |
| 203 | |
| 204 | ret = cmd_db_get_header_by_rsc_id(resource_id, &ent, &rsc_hdr); |
| 205 | |
| 206 | return ret < 0 ? 0 : ent.len; |
| 207 | } |
| 208 | |
| 209 | u16 cmd_db_get_version(const char *resource_id) |
| 210 | { |
| 211 | int ret; |
| 212 | struct entry_header ent; |
| 213 | struct rsc_hdr rsc_hdr; |
| 214 | |
| 215 | ret = cmd_db_get_header_by_rsc_id(resource_id, &ent, &rsc_hdr); |
| 216 | return ret < 0 ? 0 : rsc_hdr.version; |
| 217 | } |
| 218 | |
| 219 | int cmd_db_ready(void) |
| 220 | { |
| 221 | return cmd_db_status; |
| 222 | } |
| 223 | |
Lina Iyer | 1c5ab79 | 2017-02-01 13:34:54 -0700 | [diff] [blame] | 224 | int cmd_db_is_standalone(void) |
| 225 | { |
| 226 | if (cmd_db_status < 0) |
| 227 | return cmd_db_status; |
| 228 | |
| 229 | return !!(cmd_db_header->reserved & CMD_DB_STANDALONE_MASK); |
| 230 | } |
| 231 | |
Mahesh Sivasubramanian | cb64952 | 2016-08-19 14:04:44 -0600 | [diff] [blame] | 232 | int cmd_db_get_slave_id(const char *resource_id) |
| 233 | { |
| 234 | int ret; |
| 235 | struct entry_header ent; |
| 236 | struct rsc_hdr rsc_hdr; |
| 237 | |
| 238 | ret = cmd_db_get_header_by_rsc_id(resource_id, &ent, &rsc_hdr); |
| 239 | return ret < 0 ? 0 : (ent.addr >> SLAVE_ID_SHIFT) & SLAVE_ID_MASK; |
| 240 | } |
| 241 | |
| 242 | static int cmd_db_dev_probe(struct platform_device *pdev) |
| 243 | { |
| 244 | struct resource *res; |
| 245 | |
| 246 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| 247 | if (!res) { |
| 248 | cmd_db_status = -ENOMEM; |
| 249 | goto failed; |
| 250 | } |
| 251 | |
| 252 | start_addr = devm_ioremap_resource(&pdev->dev, res); |
| 253 | |
| 254 | cmd_db_header = devm_kzalloc(&pdev->dev, sizeof(*cmd_db_header), |
| 255 | GFP_KERNEL); |
| 256 | |
| 257 | if (!cmd_db_header) { |
| 258 | cmd_db_status = -ENOMEM; |
| 259 | goto failed; |
| 260 | } |
| 261 | |
| 262 | memcpy(cmd_db_header, start_addr, sizeof(*cmd_db_header)); |
| 263 | |
| 264 | if (cmd_db_header->magic_num != CMD_DB_MAGIC) { |
| 265 | pr_err("%s(): Invalid Magic\n", __func__); |
| 266 | cmd_db_status = -EINVAL; |
| 267 | goto failed; |
| 268 | } |
| 269 | cmd_db_status = 0; |
| 270 | of_platform_populate(pdev->dev.of_node, NULL, NULL, &pdev->dev); |
Lina Iyer | 1c5ab79 | 2017-02-01 13:34:54 -0700 | [diff] [blame] | 271 | |
| 272 | if (cmd_db_is_standalone() == 1) |
| 273 | pr_info("Command DB is initialized in standalone mode.\n"); |
| 274 | |
Mahesh Sivasubramanian | cb64952 | 2016-08-19 14:04:44 -0600 | [diff] [blame] | 275 | failed: |
| 276 | return cmd_db_status; |
| 277 | } |
| 278 | |
| 279 | static const struct of_device_id cmd_db_match_table[] = { |
| 280 | {.compatible = "qcom,cmd-db"}, |
| 281 | {}, |
| 282 | }; |
| 283 | |
| 284 | static struct platform_driver cmd_db_dev_driver = { |
| 285 | .probe = cmd_db_dev_probe, |
| 286 | .driver = { |
| 287 | .name = "cmd-db", |
| 288 | .owner = THIS_MODULE, |
| 289 | .of_match_table = cmd_db_match_table, |
| 290 | }, |
| 291 | }; |
| 292 | |
| 293 | int __init cmd_db_device_init(void) |
| 294 | { |
| 295 | return platform_driver_register(&cmd_db_dev_driver); |
| 296 | } |
| 297 | arch_initcall(cmd_db_device_init); |