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/* Copyright 2021 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#define DT_DRV_COMPAT cros_clock_control_emul
#include <zephyr/device.h>
#include <zephyr/drivers/clock_control.h>
#include <zephyr/kernel.h>
#include "common.h"
#include "emul/emul_clock_control.h"
#include <zephyr/logging/log.h>
LOG_MODULE_REGISTER(clock_control_emul, CONFIG_CLOCK_CONTROL_EMUL_LOG_LEVEL);
/** Data needed to maintain the current emulator state */
struct emul_clock_ctrl_data {
/** The current clock rate */
uint32_t rate;
/** The current clock status */
enum clock_control_status status;
/** Async k_work structure */
struct k_work async_on_work;
/** Mutex used to guard the callback values */
struct k_mutex cb_mutex;
/** Async callback */
clock_control_cb_t cb;
/** Async user data to pass to the callback */
void *cb_user_data;
/** Async device to pass to the callback */
const struct device *cb_dev;
/** Async subsystem to pass to the callback */
clock_control_subsys_t cb_subsys;
};
static int drv_clock_ctrl_on(const struct device *dev,
clock_control_subsys_t sys)
{
struct emul_clock_ctrl_data *data = dev->data;
int rc;
k_mutex_lock(&data->cb_mutex, K_FOREVER);
if (data->status == CLOCK_CONTROL_STATUS_OFF) {
data->status = CLOCK_CONTROL_STATUS_ON;
rc = 0;
} else {
LOG_ERR("Invalid clock status: %d", data->status);
rc = EC_ERROR_UNIMPLEMENTED;
}
k_mutex_unlock(&data->cb_mutex);
return 0;
}
static int drv_clock_ctrl_off(const struct device *dev,
clock_control_subsys_t sys)
{
struct emul_clock_ctrl_data *data = dev->data;
int rc;
k_mutex_lock(&data->cb_mutex, K_FOREVER);
if (data->status == CLOCK_CONTROL_STATUS_ON) {
data->status = CLOCK_CONTROL_STATUS_OFF;
rc = 0;
} else {
LOG_ERR("Invalid clock status: %d", data->status);
rc = EC_ERROR_UNIMPLEMENTED;
}
k_mutex_unlock(&data->cb_mutex);
return rc;
}
static void clock_ctrl_on_from_work(struct k_work *work)
{
struct emul_clock_ctrl_data *data =
CONTAINER_OF(work, struct emul_clock_ctrl_data, async_on_work);
k_mutex_lock(&data->cb_mutex, K_FOREVER);
if (data->status == CLOCK_CONTROL_STATUS_STARTING) {
data->status = CLOCK_CONTROL_STATUS_ON;
data->cb(data->cb_dev, data->cb_subsys, data->cb_user_data);
data->cb = NULL;
data->cb_dev = NULL;
data->cb_subsys = NULL;
data->cb_user_data = NULL;
} else {
LOG_ERR("Invalid clock status: %d", data->status);
}
k_mutex_unlock(&data->cb_mutex);
}
static int drv_clock_ctrl_async_on(const struct device *dev,
clock_control_subsys_t sys,
clock_control_cb_t cb, void *user_data)
{
struct emul_clock_ctrl_data *data = dev->data;
int rc;
k_mutex_lock(&data->cb_mutex, K_FOREVER);
switch (data->status) {
case CLOCK_CONTROL_STATUS_ON:
rc = 0;
break;
case CLOCK_CONTROL_STATUS_STARTING:
rc = EC_ERROR_BUSY;
break;
case CLOCK_CONTROL_STATUS_OFF:
data->status = CLOCK_CONTROL_STATUS_STARTING;
data->cb = cb;
data->cb_dev = dev;
data->cb_subsys = sys;
data->cb_user_data = user_data;
k_work_init(&data->async_on_work, clock_ctrl_on_from_work);
rc = k_work_submit(&data->async_on_work);
if (rc > 0) {
/*
* Work is already submitted, this should never happen
* because of the above cases.
*/
rc = EC_ERROR_UNKNOWN;
} else if (rc < 0) {
rc = EC_ERROR_BUSY;
}
break;
default:
LOG_ERR("Invalid clock status: %d", data->status);
rc = EC_ERROR_UNIMPLEMENTED;
}
k_mutex_unlock(&data->cb_mutex);
return rc;
}
static int drv_clock_ctrl_get_rate(const struct device *dev,
clock_control_subsys_t sys, uint32_t *rate)
{
struct emul_clock_ctrl_data *data = dev->data;
*rate = data->rate;
return 0;
}
static enum clock_control_status
drv_clock_ctrl_get_status(const struct device *dev, clock_control_subsys_t sys)
{
struct emul_clock_ctrl_data *data = dev->data;
enum clock_control_status status;
k_mutex_lock(&data->cb_mutex, K_FOREVER);
status = data->status;
k_mutex_unlock(&data->cb_mutex);
return status;
}
static const struct clock_control_driver_api driver_api = {
.on = drv_clock_ctrl_on,
.off = drv_clock_ctrl_off,
.async_on = drv_clock_ctrl_async_on,
.get_rate = drv_clock_ctrl_get_rate,
.get_status = drv_clock_ctrl_get_status,
};
static int drv_clock_ctrl_init(const struct device *dev)
{
struct emul_clock_ctrl_data *data = dev->data;
k_mutex_init(&data->cb_mutex);
return 0;
}
#define INIT_CLOCK_CTRL(n) \
static struct emul_clock_ctrl_data emul_clock_ctrl_data_##n = { \
.status = COND_CODE_1(DT_INST_PROP(n, clock_frequency) == 0, \
(CLOCK_CONTROL_STATUS_OFF), \
(CLOCK_CONTROL_STATUS_ON)), \
.rate = DT_INST_PROP(n, clock_frequency), \
}; \
DEVICE_DT_INST_DEFINE(n, drv_clock_ctrl_init, NULL, \
&emul_clock_ctrl_data_##n, NULL, PRE_KERNEL_1, \
CONFIG_KERNEL_INIT_PRIORITY_OBJECTS, \
&driver_api);
DT_INST_FOREACH_STATUS_OKAY(INIT_CLOCK_CTRL)
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