blob: cb2c7b8272f84a47047d85184a59ba246ae5530b [file] [log] [blame]
/*
* Copyright 2019 Henrik Brix Andersen <henrik@brixandersen.dk>
*
* Heavily based on pwm_mcux_ftm.c, which is:
* Copyright (c) 2017, NXP
*
* SPDX-License-Identifier: Apache-2.0
*/
#define DT_DRV_COMPAT openisa_rv32m1_tpm
#include <zephyr/drivers/clock_control.h>
#include <errno.h>
#include <zephyr/drivers/pwm.h>
#include <soc.h>
#include <fsl_tpm.h>
#include <fsl_clock.h>
#ifdef CONFIG_PINCTRL
#include <zephyr/drivers/pinctrl.h>
#endif
#define LOG_LEVEL CONFIG_PWM_LOG_LEVEL
#include <zephyr/logging/log.h>
LOG_MODULE_REGISTER(pwm_rv32m1_tpm);
#define MAX_CHANNELS ARRAY_SIZE(TPM0->CONTROLS)
struct rv32m1_tpm_config {
TPM_Type *base;
const struct device *clock_dev;
clock_control_subsys_t clock_subsys;
tpm_clock_source_t tpm_clock_source;
tpm_clock_prescale_t prescale;
uint8_t channel_count;
tpm_pwm_mode_t mode;
#ifdef CONFIG_PINCTRL
const struct pinctrl_dev_config *pincfg;
#endif
};
struct rv32m1_tpm_data {
uint32_t clock_freq;
uint32_t period_cycles;
tpm_chnl_pwm_signal_param_t channel[MAX_CHANNELS];
};
static int rv32m1_tpm_set_cycles(const struct device *dev, uint32_t channel,
uint32_t period_cycles, uint32_t pulse_cycles,
pwm_flags_t flags)
{
const struct rv32m1_tpm_config *config = dev->config;
struct rv32m1_tpm_data *data = dev->data;
uint8_t duty_cycle;
if (period_cycles == 0U) {
LOG_ERR("Channel can not be set to inactive level");
return -ENOTSUP;
}
if (channel >= config->channel_count) {
LOG_ERR("Invalid channel");
return -ENOTSUP;
}
duty_cycle = pulse_cycles * 100U / period_cycles;
data->channel[channel].dutyCyclePercent = duty_cycle;
if ((flags & PWM_POLARITY_INVERTED) == 0) {
data->channel[channel].level = kTPM_HighTrue;
} else {
data->channel[channel].level = kTPM_LowTrue;
}
LOG_DBG("pulse_cycles=%d, period_cycles=%d, duty_cycle=%d, flags=%d",
pulse_cycles, period_cycles, duty_cycle, flags);
if (period_cycles != data->period_cycles) {
uint32_t pwm_freq;
status_t status;
if (data->period_cycles != 0) {
/* Only warn when not changing from zero */
LOG_WRN("Changing period cycles from %d to %d"
" affects all %d channels in %s",
data->period_cycles, period_cycles,
config->channel_count, dev->name);
}
data->period_cycles = period_cycles;
pwm_freq = (data->clock_freq >> config->prescale) /
period_cycles;
LOG_DBG("pwm_freq=%d, clock_freq=%d", pwm_freq,
data->clock_freq);
if (pwm_freq == 0U) {
LOG_ERR("Could not set up pwm_freq=%d", pwm_freq);
return -EINVAL;
}
TPM_StopTimer(config->base);
status = TPM_SetupPwm(config->base, data->channel,
config->channel_count, config->mode,
pwm_freq, data->clock_freq);
if (status != kStatus_Success) {
LOG_ERR("Could not set up pwm");
return -ENOTSUP;
}
TPM_StartTimer(config->base, config->tpm_clock_source);
} else {
TPM_UpdateChnlEdgeLevelSelect(config->base, channel,
data->channel[channel].level);
TPM_UpdatePwmDutycycle(config->base, channel, config->mode,
duty_cycle);
}
return 0;
}
static int rv32m1_tpm_get_cycles_per_sec(const struct device *dev,
uint32_t channel, uint64_t *cycles)
{
const struct rv32m1_tpm_config *config = dev->config;
struct rv32m1_tpm_data *data = dev->data;
*cycles = data->clock_freq >> config->prescale;
return 0;
}
static int rv32m1_tpm_init(const struct device *dev)
{
const struct rv32m1_tpm_config *config = dev->config;
struct rv32m1_tpm_data *data = dev->data;
tpm_chnl_pwm_signal_param_t *channel = data->channel;
tpm_config_t tpm_config;
#ifdef CONFIG_PINCTRL
int err;
#endif
int i;
if (config->channel_count > ARRAY_SIZE(data->channel)) {
LOG_ERR("Invalid channel count");
return -EINVAL;
}
if (clock_control_on(config->clock_dev, config->clock_subsys)) {
LOG_ERR("Could not turn on clock");
return -EINVAL;
}
if (clock_control_get_rate(config->clock_dev, config->clock_subsys,
&data->clock_freq)) {
LOG_ERR("Could not get clock frequency");
return -EINVAL;
}
for (i = 0; i < config->channel_count; i++) {
channel->chnlNumber = i;
channel->level = kTPM_NoPwmSignal;
channel->dutyCyclePercent = 0;
channel->firstEdgeDelayPercent = 0;
channel++;
}
#ifdef CONFIG_PINCTRL
err = pinctrl_apply_state(config->pincfg, PINCTRL_STATE_DEFAULT);
if (err) {
return err;
}
#endif
TPM_GetDefaultConfig(&tpm_config);
tpm_config.prescale = config->prescale;
TPM_Init(config->base, &tpm_config);
return 0;
}
static const struct pwm_driver_api rv32m1_tpm_driver_api = {
.set_cycles = rv32m1_tpm_set_cycles,
.get_cycles_per_sec = rv32m1_tpm_get_cycles_per_sec,
};
#ifdef CONFIG_PINCTRL
#define PINCTRL_INIT(n) .pincfg = PINCTRL_DT_INST_DEV_CONFIG_GET(n),
#define PINCTRL_DEFINE(n) PINCTRL_DT_INST_DEFINE(n);
#else
#define PINCTRL_DEFINE(n)
#define PINCTRL_INIT(n)
#endif
#define TPM_DEVICE(n) \
PINCTRL_DEFINE(n) \
static const struct rv32m1_tpm_config rv32m1_tpm_config_##n = { \
.base = (TPM_Type *) \
DT_INST_REG_ADDR(n), \
.clock_dev = DEVICE_DT_GET(DT_INST_CLOCKS_CTLR(n)), \
.clock_subsys = (clock_control_subsys_t) \
DT_INST_CLOCKS_CELL(n, name), \
.tpm_clock_source = kTPM_SystemClock, \
.prescale = kTPM_Prescale_Divide_16, \
.channel_count = FSL_FEATURE_TPM_CHANNEL_COUNTn((TPM_Type *) \
DT_INST_REG_ADDR(n)), \
.mode = kTPM_EdgeAlignedPwm, \
PINCTRL_INIT(n) \
}; \
static struct rv32m1_tpm_data rv32m1_tpm_data_##n; \
DEVICE_DT_INST_DEFINE(n, &rv32m1_tpm_init, NULL, \
&rv32m1_tpm_data_##n, \
&rv32m1_tpm_config_##n, \
POST_KERNEL, CONFIG_KERNEL_INIT_PRIORITY_DEVICE, \
&rv32m1_tpm_driver_api);
DT_INST_FOREACH_STATUS_OKAY(TPM_DEVICE)