zephyr/drivers/counter/counter_mcux_pit.c

258 lines
7.1 KiB
C

/*
* Copyright 2020 NXP
*
* SPDX-License-Identifier: Apache-2.0
*/
#define DT_DRV_COMPAT nxp_kinetis_pit
#include <zephyr/drivers/counter.h>
#include <fsl_pit.h>
#define LOG_MODULE_NAME counter_pit
#include <zephyr/logging/log.h>
LOG_MODULE_REGISTER(LOG_MODULE_NAME, CONFIG_COUNTER_LOG_LEVEL);
struct mcux_pit_config {
struct counter_config_info info;
PIT_Type *base;
bool enableRunInDebug;
pit_chnl_t pit_channel;
void (*irq_config_func)(const struct device *dev);
};
struct mcux_pit_data {
counter_alarm_callback_t alarm_callback;
counter_top_callback_t top_callback;
void *alarm_user_data;
void *top_user_data;
};
static uint32_t mcux_pit_get_top_value(const struct device *dev)
{
const struct mcux_pit_config *config = dev->config;
pit_chnl_t channel = config->pit_channel;
/*
* According to RM, the LDVAL trigger = clock ticks -1
* The underlying HAL driver function PIT_SetTimerPeriod()
* automatically subtracted 1 from the value that ends up in
* LDVAL so for reporting purposes we need to add it back in
* here to by consistent.
*/
return (config->base->CHANNEL[channel].LDVAL + 1);
}
static int mcux_pit_start(const struct device *dev)
{
const struct mcux_pit_config *config = dev->config;
LOG_DBG("period is %d", mcux_pit_get_top_value(dev));
PIT_EnableInterrupts(config->base, config->pit_channel,
kPIT_TimerInterruptEnable);
PIT_StartTimer(config->base, config->pit_channel);
return 0;
}
static int mcux_pit_stop(const struct device *dev)
{
const struct mcux_pit_config *config = dev->config;
PIT_DisableInterrupts(config->base, config->pit_channel,
kPIT_TimerInterruptEnable);
PIT_StopTimer(config->base, config->pit_channel);
return 0;
}
static int mcux_pit_get_value(const struct device *dev, uint32_t *ticks)
{
const struct mcux_pit_config *config = dev->config;
*ticks = PIT_GetCurrentTimerCount(config->base, config->pit_channel);
return 0;
}
static int mcux_pit_set_top_value(const struct device *dev,
const struct counter_top_cfg *cfg)
{
const struct mcux_pit_config *config = dev->config;
struct mcux_pit_data *data = dev->data;
pit_chnl_t channel = config->pit_channel;
if (cfg->ticks == 0) {
return -EINVAL;
}
data->top_callback = cfg->callback;
data->top_user_data = cfg->user_data;
if (config->base->CHANNEL[channel].TCTRL & PIT_TCTRL_TEN_MASK) {
/* Timer already enabled, check flags before resetting */
if (cfg->flags & COUNTER_TOP_CFG_DONT_RESET) {
return -ENOTSUP;
}
PIT_StopTimer(config->base, channel);
PIT_SetTimerPeriod(config->base, channel, cfg->ticks);
PIT_StartTimer(config->base, channel);
} else {
PIT_SetTimerPeriod(config->base, channel, cfg->ticks);
}
return 0;
}
static uint32_t mcux_pit_get_pending_int(const struct device *dev)
{
const struct mcux_pit_config *config = dev->config;
uint32_t mask = PIT_TFLG_TIF_MASK;
uint32_t flags;
flags = PIT_GetStatusFlags(config->base, config->pit_channel);
return ((flags & mask) == mask);
}
static void mcux_pit_isr(const struct device *dev)
{
const struct mcux_pit_config *config = dev->config;
struct mcux_pit_data *data = dev->data;
uint32_t flags;
uint32_t current = 0;
LOG_DBG("pit counter isr");
flags = PIT_GetStatusFlags(config->base, config->pit_channel);
PIT_ClearStatusFlags(config->base, config->pit_channel, flags);
if (data->top_callback) {
data->top_callback(dev, data->top_user_data);
}
if (data->alarm_callback) {
PIT_StopTimer(config->base, config->pit_channel);
mcux_pit_get_value(dev, &current);
data->alarm_callback(dev, config->pit_channel, current,
data->alarm_user_data);
}
}
static int mcux_pit_set_alarm(const struct device *dev, uint8_t chan_id,
const struct counter_alarm_cfg *alarm_cfg)
{
const struct mcux_pit_config *config = dev->config;
struct mcux_pit_data *data = dev->data;
uint32_t ticks = alarm_cfg->ticks;
if (chan_id != DT_INST_PROP(0, pit_channel)) {
LOG_ERR("Invalid channel id");
return -EINVAL;
}
if (ticks > mcux_pit_get_top_value(dev)) {
LOG_ERR("Invalid ticks");
return -EINVAL;
}
PIT_StopTimer(config->base, chan_id);
PIT_SetTimerPeriod(config->base, chan_id, ticks);
data->alarm_callback = alarm_cfg->callback;
data->alarm_user_data = alarm_cfg->user_data;
LOG_DBG("set alarm to %d", ticks);
PIT_StartTimer(config->base, chan_id);
return 0;
}
static int mcux_pit_cancel_alarm(const struct device *dev, uint8_t chan_id)
{
const struct mcux_pit_config *config = dev->config;
struct mcux_pit_data *data = dev->data;
if (chan_id != DT_INST_PROP(0, pit_channel)) {
LOG_ERR("Invalid channel id");
return -EINVAL;
}
PIT_DisableInterrupts(config->base, chan_id, kPIT_TimerInterruptEnable);
PIT_StopTimer(config->base, chan_id);
data->alarm_callback = NULL;
return 0;
}
static int mcux_pit_init(const struct device *dev)
{
const struct mcux_pit_config *config =
(struct mcux_pit_config *)dev->config;
pit_config_t pit_config;
PIT_GetDefaultConfig(&pit_config);
pit_config.enableRunInDebug = config->enableRunInDebug;
PIT_Init(config->base, &pit_config);
config->irq_config_func(dev);
PIT_SetTimerPeriod(config->base, config->pit_channel,
USEC_TO_COUNT(DT_INST_PROP(0, pit_period),
CLOCK_GetFreq(kCLOCK_BusClk)));
return 0;
}
static const struct counter_driver_api mcux_pit_driver_api = {
.start = mcux_pit_start,
.stop = mcux_pit_stop,
.get_value = mcux_pit_get_value,
.set_top_value = mcux_pit_set_top_value,
.set_alarm = mcux_pit_set_alarm,
.cancel_alarm = mcux_pit_cancel_alarm,
.get_pending_int = mcux_pit_get_pending_int,
.get_top_value = mcux_pit_get_top_value,
};
/*
* This driver is single-instance. If the devicetree contains multiple
* instances, this will fail and the driver needs to be revisited.
*/
BUILD_ASSERT(DT_NUM_INST_STATUS_OKAY(DT_DRV_COMPAT) <= 1,
"unsupported pit instance");
static struct mcux_pit_data mcux_pit_data_0;
static void mcux_pit_irq_config_0(const struct device *dev);
static const struct mcux_pit_config mcux_pit_config_0 = {
.info = {
.max_top_value = UINT32_MAX,
.channels = 1,
.freq = DT_INST_PROP(0, clock_frequency),
},
.base = (PIT_Type *)DT_INST_REG_ADDR(0),
.pit_channel = DT_INST_PROP(0, pit_channel),
.irq_config_func = mcux_pit_irq_config_0,
};
DEVICE_DT_INST_DEFINE(0, &mcux_pit_init, NULL,
&mcux_pit_data_0, &mcux_pit_config_0, POST_KERNEL,
CONFIG_COUNTER_INIT_PRIORITY, &mcux_pit_driver_api);
static void mcux_pit_irq_config_0(const struct device *dev)
{
IRQ_CONNECT(DT_INST_IRQ_BY_IDX(0, 0, irq),
DT_INST_IRQ_BY_IDX(0, 0, priority), mcux_pit_isr,
DEVICE_DT_INST_GET(0), 0);
irq_enable(DT_INST_IRQ_BY_IDX(0, 0, irq));
IRQ_CONNECT(DT_INST_IRQ_BY_IDX(0, 1, irq),
DT_INST_IRQ_BY_IDX(0, 1, priority), mcux_pit_isr,
DEVICE_DT_INST_GET(0), 0);
irq_enable(DT_INST_IRQ_BY_IDX(0, 1, irq));
IRQ_CONNECT(DT_INST_IRQ_BY_IDX(0, 2, irq),
DT_INST_IRQ_BY_IDX(0, 2, priority), mcux_pit_isr,
DEVICE_DT_INST_GET(0), 0);
irq_enable(DT_INST_IRQ_BY_IDX(0, 2, irq));
IRQ_CONNECT(DT_INST_IRQ_BY_IDX(0, 3, irq),
DT_INST_IRQ_BY_IDX(0, 3, priority), mcux_pit_isr,
DEVICE_DT_INST_GET(0), 0);
irq_enable(DT_INST_IRQ_BY_IDX(0, 3, irq));
}