blob: 31cd8c49a878126a0bedd22de0a997168baf3730 [file] [log] [blame]
/* Copyright (c) 2013-2017, The Linux Foundation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/delay.h>
#include <linux/workqueue.h>
#include <linux/reboot.h>
#include "esoc.h"
#include "mdm-dbg.h"
enum {
PWR_OFF = 0x1,
PWR_ON,
BOOT,
RUN,
CRASH,
IN_DEBUG,
SHUTDOWN,
RESET,
PEER_CRASH,
};
struct mdm_drv {
unsigned int mode;
struct esoc_eng cmd_eng;
struct completion boot_done;
struct completion req_eng_wait;
struct esoc_clink *esoc_clink;
bool boot_fail;
struct workqueue_struct *mdm_queue;
struct work_struct ssr_work;
struct notifier_block esoc_restart;
};
#define to_mdm_drv(d) container_of(d, struct mdm_drv, cmd_eng)
static int esoc_msm_restart_handler(struct notifier_block *nb,
unsigned long action, void *data)
{
struct mdm_drv *mdm_drv = container_of(nb, struct mdm_drv,
esoc_restart);
struct esoc_clink *esoc_clink = mdm_drv->esoc_clink;
const struct esoc_clink_ops * const clink_ops = esoc_clink->clink_ops;
if (action == SYS_RESTART) {
if (mdm_dbg_stall_notify(ESOC_PRIMARY_REBOOT))
return NOTIFY_OK;
dev_dbg(&esoc_clink->dev, "Notifying esoc of cold reboot\n");
clink_ops->notify(ESOC_PRIMARY_REBOOT, esoc_clink);
}
return NOTIFY_OK;
}
static void mdm_handle_clink_evt(enum esoc_evt evt,
struct esoc_eng *eng)
{
struct mdm_drv *mdm_drv = to_mdm_drv(eng);
switch (evt) {
case ESOC_INVALID_STATE:
mdm_drv->boot_fail = true;
complete(&mdm_drv->boot_done);
break;
case ESOC_RUN_STATE:
mdm_drv->boot_fail = false;
mdm_drv->mode = RUN,
complete(&mdm_drv->boot_done);
break;
case ESOC_UNEXPECTED_RESET:
case ESOC_ERR_FATAL:
if (mdm_drv->mode == CRASH)
return;
mdm_drv->mode = CRASH;
queue_work(mdm_drv->mdm_queue, &mdm_drv->ssr_work);
break;
case ESOC_REQ_ENG_ON:
complete(&mdm_drv->req_eng_wait);
break;
default:
break;
}
}
static void mdm_ssr_fn(struct work_struct *work)
{
struct mdm_drv *mdm_drv = container_of(work, struct mdm_drv, ssr_work);
/*
* If restarting esoc fails, the SSR framework triggers a kernel panic
*/
esoc_clink_request_ssr(mdm_drv->esoc_clink);
}
static void mdm_crash_shutdown(const struct subsys_desc *mdm_subsys)
{
struct esoc_clink *esoc_clink =
container_of(mdm_subsys,
struct esoc_clink,
subsys);
const struct esoc_clink_ops * const clink_ops = esoc_clink->clink_ops;
if (mdm_dbg_stall_notify(ESOC_PRIMARY_CRASH))
return;
clink_ops->notify(ESOC_PRIMARY_CRASH, esoc_clink);
}
static int mdm_subsys_shutdown(const struct subsys_desc *crashed_subsys,
bool force_stop)
{
int ret;
struct esoc_clink *esoc_clink =
container_of(crashed_subsys, struct esoc_clink, subsys);
struct mdm_drv *mdm_drv = esoc_get_drv_data(esoc_clink);
const struct esoc_clink_ops * const clink_ops = esoc_clink->clink_ops;
if (mdm_drv->mode == CRASH || mdm_drv->mode == PEER_CRASH) {
if (mdm_dbg_stall_cmd(ESOC_PREPARE_DEBUG))
/* We want to mask debug command.
* In this case return success
* to move to next stage
*/
return 0;
ret = clink_ops->cmd_exe(ESOC_PREPARE_DEBUG,
esoc_clink);
if (ret) {
dev_err(&esoc_clink->dev, "failed to enter debug\n");
return ret;
}
mdm_drv->mode = IN_DEBUG;
} else if (!force_stop) {
if (esoc_clink->subsys.sysmon_shutdown_ret)
ret = clink_ops->cmd_exe(ESOC_FORCE_PWR_OFF,
esoc_clink);
else {
if (mdm_dbg_stall_cmd(ESOC_PWR_OFF))
/* Since power off command is masked
* we return success, and leave the state
* of the command engine as is.
*/
return 0;
ret = clink_ops->cmd_exe(ESOC_PWR_OFF, esoc_clink);
}
if (ret) {
dev_err(&esoc_clink->dev, "failed to exe power off\n");
return ret;
}
mdm_drv->mode = PWR_OFF;
}
return 0;
}
static int mdm_subsys_powerup(const struct subsys_desc *crashed_subsys)
{
int ret;
struct esoc_clink *esoc_clink =
container_of(crashed_subsys, struct esoc_clink,
subsys);
struct mdm_drv *mdm_drv = esoc_get_drv_data(esoc_clink);
const struct esoc_clink_ops * const clink_ops = esoc_clink->clink_ops;
if (!esoc_req_eng_enabled(esoc_clink)) {
dev_dbg(&esoc_clink->dev, "Wait for req eng registration\n");
wait_for_completion(&mdm_drv->req_eng_wait);
}
if (mdm_drv->mode == PWR_OFF) {
if (mdm_dbg_stall_cmd(ESOC_PWR_ON))
return -EBUSY;
ret = clink_ops->cmd_exe(ESOC_PWR_ON, esoc_clink);
if (ret) {
dev_err(&esoc_clink->dev, "pwr on fail\n");
return ret;
}
} else if (mdm_drv->mode == IN_DEBUG) {
ret = clink_ops->cmd_exe(ESOC_EXIT_DEBUG, esoc_clink);
if (ret) {
dev_err(&esoc_clink->dev, "cannot exit debug mode\n");
return ret;
}
mdm_drv->mode = PWR_OFF;
ret = clink_ops->cmd_exe(ESOC_PWR_ON, esoc_clink);
if (ret) {
dev_err(&esoc_clink->dev, "pwr on fail\n");
return ret;
}
}
wait_for_completion(&mdm_drv->boot_done);
if (mdm_drv->boot_fail) {
dev_err(&esoc_clink->dev, "booting failed\n");
return -EIO;
}
return 0;
}
static int mdm_subsys_ramdumps(int want_dumps,
const struct subsys_desc *crashed_subsys)
{
int ret;
struct esoc_clink *esoc_clink =
container_of(crashed_subsys, struct esoc_clink,
subsys);
const struct esoc_clink_ops * const clink_ops = esoc_clink->clink_ops;
if (want_dumps) {
ret = clink_ops->cmd_exe(ESOC_EXE_DEBUG, esoc_clink);
if (ret) {
dev_err(&esoc_clink->dev, "debugging failed\n");
return ret;
}
}
return 0;
}
static int mdm_register_ssr(struct esoc_clink *esoc_clink)
{
esoc_clink->subsys.shutdown = mdm_subsys_shutdown;
esoc_clink->subsys.ramdump = mdm_subsys_ramdumps;
esoc_clink->subsys.powerup = mdm_subsys_powerup;
esoc_clink->subsys.crash_shutdown = mdm_crash_shutdown;
return esoc_clink_register_ssr(esoc_clink);
}
int esoc_ssr_probe(struct esoc_clink *esoc_clink, struct esoc_drv *drv)
{
int ret;
struct mdm_drv *mdm_drv;
struct esoc_eng *esoc_eng;
mdm_drv = devm_kzalloc(&esoc_clink->dev, sizeof(*mdm_drv), GFP_KERNEL);
if (IS_ERR_OR_NULL(mdm_drv))
return PTR_ERR(mdm_drv);
esoc_eng = &mdm_drv->cmd_eng;
esoc_eng->handle_clink_evt = mdm_handle_clink_evt;
ret = esoc_clink_register_cmd_eng(esoc_clink, esoc_eng);
if (ret) {
dev_err(&esoc_clink->dev, "failed to register cmd engine\n");
return ret;
}
ret = mdm_register_ssr(esoc_clink);
if (ret)
goto ssr_err;
mdm_drv->mdm_queue = alloc_workqueue("mdm_drv_queue", 0, 0);
if (!mdm_drv->mdm_queue) {
dev_err(&esoc_clink->dev, "could not create mdm_queue\n");
goto queue_err;
}
esoc_set_drv_data(esoc_clink, mdm_drv);
init_completion(&mdm_drv->boot_done);
init_completion(&mdm_drv->req_eng_wait);
INIT_WORK(&mdm_drv->ssr_work, mdm_ssr_fn);
mdm_drv->esoc_clink = esoc_clink;
mdm_drv->mode = PWR_OFF;
mdm_drv->boot_fail = false;
mdm_drv->esoc_restart.notifier_call = esoc_msm_restart_handler;
ret = register_reboot_notifier(&mdm_drv->esoc_restart);
if (ret)
dev_err(&esoc_clink->dev, "register for reboot failed\n");
ret = mdm_dbg_eng_init(drv, esoc_clink);
if (ret) {
debug_init_done = false;
dev_err(&esoc_clink->dev, "dbg engine failure\n");
} else {
dev_dbg(&esoc_clink->dev, "dbg engine initialized\n");
debug_init_done = true;
}
return 0;
queue_err:
esoc_clink_unregister_ssr(esoc_clink);
ssr_err:
esoc_clink_unregister_cmd_eng(esoc_clink, esoc_eng);
return ret;
}
static struct esoc_compat compat_table[] = {
{ .name = "MDM9x25",
.data = NULL,
},
{
.name = "MDM9x35",
.data = NULL,
},
{
.name = "MDM9x55",
.data = NULL,
},
};
static struct esoc_drv esoc_ssr_drv = {
.owner = THIS_MODULE,
.probe = esoc_ssr_probe,
.compat_table = compat_table,
.compat_entries = ARRAY_SIZE(compat_table),
.driver = {
.name = "mdm-4x",
},
};
int __init esoc_ssr_init(void)
{
return esoc_drv_register(&esoc_ssr_drv);
}
module_init(esoc_ssr_init);
MODULE_LICENSE("GPL v2");