Satya Durga Srinivasu Prabhala | 377d32f | 2017-03-15 11:09:28 -0700 | [diff] [blame] | 1 | /* Copyright (c) 2013-2017, The Linux Foundation. All rights reserved. |
Abhimanyu Kapur | c75b2e1 | 2016-02-22 18:15:13 -0800 | [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/delay.h> |
| 14 | #include <linux/workqueue.h> |
| 15 | #include <linux/reboot.h> |
| 16 | #include "esoc.h" |
Trilok Soni | 8ca296e | 2016-08-21 23:38:25 -0700 | [diff] [blame] | 17 | #include "mdm-dbg.h" |
Abhimanyu Kapur | c75b2e1 | 2016-02-22 18:15:13 -0800 | [diff] [blame] | 18 | |
| 19 | enum { |
| 20 | PWR_OFF = 0x1, |
| 21 | PWR_ON, |
| 22 | BOOT, |
| 23 | RUN, |
| 24 | CRASH, |
| 25 | IN_DEBUG, |
| 26 | SHUTDOWN, |
| 27 | RESET, |
| 28 | PEER_CRASH, |
| 29 | }; |
| 30 | |
| 31 | struct mdm_drv { |
| 32 | unsigned int mode; |
| 33 | struct esoc_eng cmd_eng; |
| 34 | struct completion boot_done; |
| 35 | struct completion req_eng_wait; |
| 36 | struct esoc_clink *esoc_clink; |
| 37 | bool boot_fail; |
| 38 | struct workqueue_struct *mdm_queue; |
| 39 | struct work_struct ssr_work; |
| 40 | struct notifier_block esoc_restart; |
| 41 | }; |
| 42 | #define to_mdm_drv(d) container_of(d, struct mdm_drv, cmd_eng) |
| 43 | |
| 44 | static int esoc_msm_restart_handler(struct notifier_block *nb, |
| 45 | unsigned long action, void *data) |
| 46 | { |
| 47 | struct mdm_drv *mdm_drv = container_of(nb, struct mdm_drv, |
| 48 | esoc_restart); |
| 49 | struct esoc_clink *esoc_clink = mdm_drv->esoc_clink; |
| 50 | const struct esoc_clink_ops * const clink_ops = esoc_clink->clink_ops; |
| 51 | |
| 52 | if (action == SYS_RESTART) { |
Trilok Soni | 8ca296e | 2016-08-21 23:38:25 -0700 | [diff] [blame] | 53 | if (mdm_dbg_stall_notify(ESOC_PRIMARY_REBOOT)) |
| 54 | return NOTIFY_OK; |
Abhimanyu Kapur | c75b2e1 | 2016-02-22 18:15:13 -0800 | [diff] [blame] | 55 | dev_dbg(&esoc_clink->dev, "Notifying esoc of cold reboot\n"); |
| 56 | clink_ops->notify(ESOC_PRIMARY_REBOOT, esoc_clink); |
| 57 | } |
| 58 | return NOTIFY_OK; |
| 59 | } |
| 60 | static void mdm_handle_clink_evt(enum esoc_evt evt, |
| 61 | struct esoc_eng *eng) |
| 62 | { |
| 63 | struct mdm_drv *mdm_drv = to_mdm_drv(eng); |
| 64 | |
| 65 | switch (evt) { |
| 66 | case ESOC_INVALID_STATE: |
| 67 | mdm_drv->boot_fail = true; |
| 68 | complete(&mdm_drv->boot_done); |
| 69 | break; |
| 70 | case ESOC_RUN_STATE: |
| 71 | mdm_drv->boot_fail = false; |
| 72 | mdm_drv->mode = RUN, |
| 73 | complete(&mdm_drv->boot_done); |
| 74 | break; |
| 75 | case ESOC_UNEXPECTED_RESET: |
| 76 | case ESOC_ERR_FATAL: |
| 77 | if (mdm_drv->mode == CRASH) |
| 78 | return; |
| 79 | mdm_drv->mode = CRASH; |
| 80 | queue_work(mdm_drv->mdm_queue, &mdm_drv->ssr_work); |
| 81 | break; |
| 82 | case ESOC_REQ_ENG_ON: |
| 83 | complete(&mdm_drv->req_eng_wait); |
| 84 | break; |
| 85 | default: |
| 86 | break; |
| 87 | } |
| 88 | } |
| 89 | |
| 90 | static void mdm_ssr_fn(struct work_struct *work) |
| 91 | { |
| 92 | struct mdm_drv *mdm_drv = container_of(work, struct mdm_drv, ssr_work); |
| 93 | |
| 94 | /* |
| 95 | * If restarting esoc fails, the SSR framework triggers a kernel panic |
| 96 | */ |
| 97 | esoc_clink_request_ssr(mdm_drv->esoc_clink); |
| 98 | } |
| 99 | |
| 100 | static void mdm_crash_shutdown(const struct subsys_desc *mdm_subsys) |
| 101 | { |
| 102 | struct esoc_clink *esoc_clink = |
| 103 | container_of(mdm_subsys, |
| 104 | struct esoc_clink, |
| 105 | subsys); |
| 106 | const struct esoc_clink_ops * const clink_ops = esoc_clink->clink_ops; |
| 107 | |
Trilok Soni | 8ca296e | 2016-08-21 23:38:25 -0700 | [diff] [blame] | 108 | if (mdm_dbg_stall_notify(ESOC_PRIMARY_CRASH)) |
| 109 | return; |
| 110 | |
Abhimanyu Kapur | c75b2e1 | 2016-02-22 18:15:13 -0800 | [diff] [blame] | 111 | clink_ops->notify(ESOC_PRIMARY_CRASH, esoc_clink); |
| 112 | } |
| 113 | |
| 114 | static int mdm_subsys_shutdown(const struct subsys_desc *crashed_subsys, |
| 115 | bool force_stop) |
| 116 | { |
| 117 | int ret; |
| 118 | struct esoc_clink *esoc_clink = |
| 119 | container_of(crashed_subsys, struct esoc_clink, subsys); |
| 120 | struct mdm_drv *mdm_drv = esoc_get_drv_data(esoc_clink); |
| 121 | const struct esoc_clink_ops * const clink_ops = esoc_clink->clink_ops; |
| 122 | |
| 123 | if (mdm_drv->mode == CRASH || mdm_drv->mode == PEER_CRASH) { |
Trilok Soni | 8ca296e | 2016-08-21 23:38:25 -0700 | [diff] [blame] | 124 | if (mdm_dbg_stall_cmd(ESOC_PREPARE_DEBUG)) |
| 125 | /* We want to mask debug command. |
| 126 | * In this case return success |
| 127 | * to move to next stage |
| 128 | */ |
| 129 | return 0; |
Abhimanyu Kapur | c75b2e1 | 2016-02-22 18:15:13 -0800 | [diff] [blame] | 130 | ret = clink_ops->cmd_exe(ESOC_PREPARE_DEBUG, |
| 131 | esoc_clink); |
| 132 | if (ret) { |
| 133 | dev_err(&esoc_clink->dev, "failed to enter debug\n"); |
| 134 | return ret; |
| 135 | } |
| 136 | mdm_drv->mode = IN_DEBUG; |
| 137 | } else if (!force_stop) { |
| 138 | if (esoc_clink->subsys.sysmon_shutdown_ret) |
| 139 | ret = clink_ops->cmd_exe(ESOC_FORCE_PWR_OFF, |
| 140 | esoc_clink); |
Trilok Soni | 8ca296e | 2016-08-21 23:38:25 -0700 | [diff] [blame] | 141 | else { |
| 142 | if (mdm_dbg_stall_cmd(ESOC_PWR_OFF)) |
| 143 | /* Since power off command is masked |
| 144 | * we return success, and leave the state |
| 145 | * of the command engine as is. |
| 146 | */ |
| 147 | return 0; |
Abhimanyu Kapur | c75b2e1 | 2016-02-22 18:15:13 -0800 | [diff] [blame] | 148 | ret = clink_ops->cmd_exe(ESOC_PWR_OFF, esoc_clink); |
Trilok Soni | 8ca296e | 2016-08-21 23:38:25 -0700 | [diff] [blame] | 149 | } |
Abhimanyu Kapur | c75b2e1 | 2016-02-22 18:15:13 -0800 | [diff] [blame] | 150 | if (ret) { |
| 151 | dev_err(&esoc_clink->dev, "failed to exe power off\n"); |
| 152 | return ret; |
| 153 | } |
| 154 | mdm_drv->mode = PWR_OFF; |
| 155 | } |
| 156 | return 0; |
| 157 | } |
| 158 | |
| 159 | static int mdm_subsys_powerup(const struct subsys_desc *crashed_subsys) |
| 160 | { |
| 161 | int ret; |
| 162 | struct esoc_clink *esoc_clink = |
| 163 | container_of(crashed_subsys, struct esoc_clink, |
| 164 | subsys); |
| 165 | struct mdm_drv *mdm_drv = esoc_get_drv_data(esoc_clink); |
| 166 | const struct esoc_clink_ops * const clink_ops = esoc_clink->clink_ops; |
| 167 | |
| 168 | if (!esoc_req_eng_enabled(esoc_clink)) { |
| 169 | dev_dbg(&esoc_clink->dev, "Wait for req eng registration\n"); |
| 170 | wait_for_completion(&mdm_drv->req_eng_wait); |
| 171 | } |
| 172 | if (mdm_drv->mode == PWR_OFF) { |
Trilok Soni | 8ca296e | 2016-08-21 23:38:25 -0700 | [diff] [blame] | 173 | if (mdm_dbg_stall_cmd(ESOC_PWR_ON)) |
| 174 | return -EBUSY; |
Abhimanyu Kapur | c75b2e1 | 2016-02-22 18:15:13 -0800 | [diff] [blame] | 175 | ret = clink_ops->cmd_exe(ESOC_PWR_ON, esoc_clink); |
| 176 | if (ret) { |
| 177 | dev_err(&esoc_clink->dev, "pwr on fail\n"); |
| 178 | return ret; |
| 179 | } |
| 180 | } else if (mdm_drv->mode == IN_DEBUG) { |
| 181 | ret = clink_ops->cmd_exe(ESOC_EXIT_DEBUG, esoc_clink); |
| 182 | if (ret) { |
| 183 | dev_err(&esoc_clink->dev, "cannot exit debug mode\n"); |
| 184 | return ret; |
| 185 | } |
| 186 | mdm_drv->mode = PWR_OFF; |
| 187 | ret = clink_ops->cmd_exe(ESOC_PWR_ON, esoc_clink); |
| 188 | if (ret) { |
| 189 | dev_err(&esoc_clink->dev, "pwr on fail\n"); |
| 190 | return ret; |
| 191 | } |
| 192 | } |
| 193 | wait_for_completion(&mdm_drv->boot_done); |
| 194 | if (mdm_drv->boot_fail) { |
| 195 | dev_err(&esoc_clink->dev, "booting failed\n"); |
| 196 | return -EIO; |
| 197 | } |
| 198 | return 0; |
| 199 | } |
| 200 | |
| 201 | static int mdm_subsys_ramdumps(int want_dumps, |
| 202 | const struct subsys_desc *crashed_subsys) |
| 203 | { |
| 204 | int ret; |
| 205 | struct esoc_clink *esoc_clink = |
| 206 | container_of(crashed_subsys, struct esoc_clink, |
| 207 | subsys); |
| 208 | const struct esoc_clink_ops * const clink_ops = esoc_clink->clink_ops; |
| 209 | |
| 210 | if (want_dumps) { |
| 211 | ret = clink_ops->cmd_exe(ESOC_EXE_DEBUG, esoc_clink); |
| 212 | if (ret) { |
| 213 | dev_err(&esoc_clink->dev, "debugging failed\n"); |
| 214 | return ret; |
| 215 | } |
| 216 | } |
| 217 | return 0; |
| 218 | } |
| 219 | |
| 220 | static int mdm_register_ssr(struct esoc_clink *esoc_clink) |
| 221 | { |
| 222 | esoc_clink->subsys.shutdown = mdm_subsys_shutdown; |
| 223 | esoc_clink->subsys.ramdump = mdm_subsys_ramdumps; |
| 224 | esoc_clink->subsys.powerup = mdm_subsys_powerup; |
| 225 | esoc_clink->subsys.crash_shutdown = mdm_crash_shutdown; |
| 226 | return esoc_clink_register_ssr(esoc_clink); |
| 227 | } |
| 228 | |
| 229 | int esoc_ssr_probe(struct esoc_clink *esoc_clink, struct esoc_drv *drv) |
| 230 | { |
| 231 | int ret; |
| 232 | struct mdm_drv *mdm_drv; |
| 233 | struct esoc_eng *esoc_eng; |
| 234 | |
| 235 | mdm_drv = devm_kzalloc(&esoc_clink->dev, sizeof(*mdm_drv), GFP_KERNEL); |
Satya Durga Srinivasu Prabhala | 377d32f | 2017-03-15 11:09:28 -0700 | [diff] [blame] | 236 | if (IS_ERR_OR_NULL(mdm_drv)) |
Abhimanyu Kapur | c75b2e1 | 2016-02-22 18:15:13 -0800 | [diff] [blame] | 237 | return PTR_ERR(mdm_drv); |
| 238 | esoc_eng = &mdm_drv->cmd_eng; |
| 239 | esoc_eng->handle_clink_evt = mdm_handle_clink_evt; |
| 240 | ret = esoc_clink_register_cmd_eng(esoc_clink, esoc_eng); |
| 241 | if (ret) { |
| 242 | dev_err(&esoc_clink->dev, "failed to register cmd engine\n"); |
| 243 | return ret; |
| 244 | } |
| 245 | ret = mdm_register_ssr(esoc_clink); |
| 246 | if (ret) |
| 247 | goto ssr_err; |
| 248 | mdm_drv->mdm_queue = alloc_workqueue("mdm_drv_queue", 0, 0); |
| 249 | if (!mdm_drv->mdm_queue) { |
| 250 | dev_err(&esoc_clink->dev, "could not create mdm_queue\n"); |
| 251 | goto queue_err; |
| 252 | } |
| 253 | esoc_set_drv_data(esoc_clink, mdm_drv); |
| 254 | init_completion(&mdm_drv->boot_done); |
| 255 | init_completion(&mdm_drv->req_eng_wait); |
| 256 | INIT_WORK(&mdm_drv->ssr_work, mdm_ssr_fn); |
| 257 | mdm_drv->esoc_clink = esoc_clink; |
| 258 | mdm_drv->mode = PWR_OFF; |
| 259 | mdm_drv->boot_fail = false; |
| 260 | mdm_drv->esoc_restart.notifier_call = esoc_msm_restart_handler; |
| 261 | ret = register_reboot_notifier(&mdm_drv->esoc_restart); |
| 262 | if (ret) |
| 263 | dev_err(&esoc_clink->dev, "register for reboot failed\n"); |
Hanumant Singh | b35bbc6 | 2015-08-10 21:23:16 -0700 | [diff] [blame] | 264 | ret = mdm_dbg_eng_init(drv, esoc_clink); |
Trilok Soni | 8ca296e | 2016-08-21 23:38:25 -0700 | [diff] [blame] | 265 | if (ret) { |
| 266 | debug_init_done = false; |
| 267 | dev_err(&esoc_clink->dev, "dbg engine failure\n"); |
| 268 | } else { |
| 269 | dev_dbg(&esoc_clink->dev, "dbg engine initialized\n"); |
| 270 | debug_init_done = true; |
| 271 | } |
Abhimanyu Kapur | c75b2e1 | 2016-02-22 18:15:13 -0800 | [diff] [blame] | 272 | return 0; |
| 273 | queue_err: |
| 274 | esoc_clink_unregister_ssr(esoc_clink); |
| 275 | ssr_err: |
| 276 | esoc_clink_unregister_cmd_eng(esoc_clink, esoc_eng); |
| 277 | return ret; |
| 278 | } |
| 279 | |
| 280 | static struct esoc_compat compat_table[] = { |
| 281 | { .name = "MDM9x25", |
| 282 | .data = NULL, |
| 283 | }, |
| 284 | { |
| 285 | .name = "MDM9x35", |
| 286 | .data = NULL, |
| 287 | }, |
| 288 | { |
| 289 | .name = "MDM9x55", |
| 290 | .data = NULL, |
| 291 | }, |
| 292 | }; |
| 293 | |
| 294 | static struct esoc_drv esoc_ssr_drv = { |
| 295 | .owner = THIS_MODULE, |
| 296 | .probe = esoc_ssr_probe, |
| 297 | .compat_table = compat_table, |
| 298 | .compat_entries = ARRAY_SIZE(compat_table), |
| 299 | .driver = { |
| 300 | .name = "mdm-4x", |
| 301 | }, |
| 302 | }; |
| 303 | |
| 304 | int __init esoc_ssr_init(void) |
| 305 | { |
| 306 | return esoc_drv_register(&esoc_ssr_drv); |
| 307 | } |
| 308 | module_init(esoc_ssr_init); |
| 309 | MODULE_LICENSE("GPL v2"); |