blob: fe5eda5d3d03416f430639312578a6493ced6125 [file] [log] [blame] [edit]
/*
* Copyright (c) 2021, NXP
*
* SPDX-License-Identifier: Apache-2.0
*/
#define DT_DRV_COMPAT nxp_sctimer_pwm
#include <errno.h>
#include <zephyr/drivers/pwm.h>
#include <fsl_sctimer.h>
#include <fsl_clock.h>
#include <zephyr/drivers/pinctrl.h>
#include <zephyr/logging/log.h>
LOG_MODULE_REGISTER(pwm_mcux_sctimer, CONFIG_PWM_LOG_LEVEL);
#define CHANNEL_COUNT FSL_FEATURE_SCT_NUMBER_OF_OUTPUTS
struct pwm_mcux_sctimer_config {
SCT_Type *base;
uint32_t prescale;
const struct pinctrl_dev_config *pincfg;
};
struct pwm_mcux_sctimer_data {
uint32_t period_cycles[CHANNEL_COUNT];
uint32_t event_number[CHANNEL_COUNT];
sctimer_pwm_signal_param_t channel[CHANNEL_COUNT];
};
static int mcux_sctimer_pwm_set_cycles(const struct device *dev,
uint32_t channel, uint32_t period_cycles,
uint32_t pulse_cycles, pwm_flags_t flags)
{
const struct pwm_mcux_sctimer_config *config = dev->config;
struct pwm_mcux_sctimer_data *data = dev->data;
uint8_t duty_cycle;
if (channel >= CHANNEL_COUNT) {
LOG_ERR("Invalid channel");
return -EINVAL;
}
if (period_cycles == 0) {
LOG_ERR("Channel can not be set to inactive level");
return -ENOTSUP;
}
if ((flags & PWM_POLARITY_INVERTED) == 0) {
data->channel[channel].level = kSCTIMER_HighTrue;
} else {
data->channel[channel].level = kSCTIMER_LowTrue;
}
duty_cycle = 100 * pulse_cycles / period_cycles;
if (duty_cycle == 0) {
SCT_Type *base = config->base;
SCTIMER_StopTimer(config->base, kSCTIMER_Counter_U);
/* Set the output to inactive State */
if (data->channel[channel].level == kSCTIMER_HighTrue) {
base->OUTPUT &= ~(1UL << channel);
} else {
base->OUTPUT |= (1UL << channel);
}
return 0;
}
if (period_cycles != data->period_cycles[channel] &&
duty_cycle != data->channel[channel].dutyCyclePercent) {
uint32_t clock_freq;
uint32_t pwm_freq;
data->period_cycles[channel] = period_cycles;
/*
* Do not divide by the prescale factor as this is accounted for in
* the SDK function
*/
clock_freq = CLOCK_GetFreq(kCLOCK_BusClk);
pwm_freq = (clock_freq / config->prescale) / period_cycles;
if (pwm_freq == 0) {
LOG_ERR("Could not set up pwm_freq=%d", pwm_freq);
return -EINVAL;
}
SCTIMER_StopTimer(config->base, kSCTIMER_Counter_U);
LOG_DBG("SETUP dutycycle to %u\n", duty_cycle);
data->channel[channel].dutyCyclePercent = duty_cycle;
if (SCTIMER_SetupPwm(config->base, &data->channel[channel],
kSCTIMER_EdgeAlignedPwm, pwm_freq,
clock_freq, &data->event_number[channel]) == kStatus_Fail) {
LOG_ERR("Could not set up pwm");
return -ENOTSUP;
}
SCTIMER_StartTimer(config->base, kSCTIMER_Counter_U);
} else {
data->period_cycles[channel] = period_cycles;
SCTIMER_UpdatePwmDutycycle(config->base, channel, duty_cycle,
data->event_number[channel]);
}
return 0;
}
static int mcux_sctimer_pwm_get_cycles_per_sec(const struct device *dev,
uint32_t channel,
uint64_t *cycles)
{
const struct pwm_mcux_sctimer_config *config = dev->config;
*cycles = CLOCK_GetFreq(kCLOCK_BusClk) / config->prescale;
return 0;
}
static int mcux_sctimer_pwm_init(const struct device *dev)
{
const struct pwm_mcux_sctimer_config *config = dev->config;
struct pwm_mcux_sctimer_data *data = dev->data;
sctimer_config_t pwm_config;
status_t status;
int i;
int err;
err = pinctrl_apply_state(config->pincfg, PINCTRL_STATE_DEFAULT);
if (err) {
return err;
}
SCTIMER_GetDefaultConfig(&pwm_config);
/* Divide the SCT clock by 8 */
pwm_config.prescale_l = config->prescale - 1;
status = SCTIMER_Init(config->base, &pwm_config);
if (status != kStatus_Success) {
LOG_ERR("Unable to init PWM");
return -EIO;
}
for (i = 0; i < CHANNEL_COUNT; i++) {
data->channel[i].output = i;
data->channel[i].level = kSCTIMER_HighTrue;
data->channel[i].dutyCyclePercent = 0;
data->period_cycles[i] = 0;
}
return 0;
}
static const struct pwm_driver_api pwm_mcux_sctimer_driver_api = {
.set_cycles = mcux_sctimer_pwm_set_cycles,
.get_cycles_per_sec = mcux_sctimer_pwm_get_cycles_per_sec,
};
#define PWM_MCUX_SCTIMER_DEVICE_INIT_MCUX(n) \
PINCTRL_DT_INST_DEFINE(n); \
static struct pwm_mcux_sctimer_data pwm_mcux_sctimer_data_##n; \
\
static const struct pwm_mcux_sctimer_config pwm_mcux_sctimer_config_##n = { \
.base = (SCT_Type *)DT_INST_REG_ADDR(n), \
.prescale = DT_INST_PROP(n, prescaler), \
.pincfg = PINCTRL_DT_INST_DEV_CONFIG_GET(n), \
}; \
\
DEVICE_DT_INST_DEFINE(n, \
mcux_sctimer_pwm_init, \
NULL, \
&pwm_mcux_sctimer_data_##n, \
&pwm_mcux_sctimer_config_##n, \
POST_KERNEL, CONFIG_PWM_INIT_PRIORITY, \
&pwm_mcux_sctimer_driver_api);
DT_INST_FOREACH_STATUS_OKAY(PWM_MCUX_SCTIMER_DEVICE_INIT_MCUX)