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counter_rpi_pico_timer.c
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/*
* Copyright (c) 2023 TOKITA Hiroshi
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <hardware/timer.h>
#include <zephyr/drivers/counter.h>
#include <zephyr/drivers/clock_control.h>
#include <zephyr/drivers/reset.h>
#include <zephyr/sys/atomic.h>
#include <zephyr/irq.h>
#include <cmsis_core.h>
#define LOG_LEVEL CONFIG_COUNTER_LOG_LEVEL
#include <zephyr/logging/log.h>
LOG_MODULE_REGISTER(counter_rpi_pico_timer, LOG_LEVEL);
#define DT_DRV_COMPAT raspberrypi_pico_timer
struct counter_rpi_pico_timer_ch_data {
counter_alarm_callback_t callback;
void *user_data;
};
struct counter_rpi_pico_timer_data {
struct counter_rpi_pico_timer_ch_data *ch_data;
uint32_t guard_period;
};
struct counter_rpi_pico_timer_config {
struct counter_config_info info;
timer_hw_t *timer;
void (*irq_config)();
const struct device *clk_dev;
clock_control_subsys_t clk_id;
const struct reset_dt_spec reset;
};
static int counter_rpi_pico_timer_start(const struct device *dev)
{
const struct counter_rpi_pico_timer_config *config = dev->config;
config->timer->pause = 0;
return 0;
}
static int counter_rpi_pico_timer_stop(const struct device *dev)
{
const struct counter_rpi_pico_timer_config *config = dev->config;
config->timer->pause = 1u;
config->timer->timelw = 0;
config->timer->timehw = 0;
return 0;
}
static uint32_t counter_rpi_pico_timer_get_top_value(const struct device *dev)
{
const struct counter_rpi_pico_timer_config *config = dev->config;
return config->info.max_top_value;
}
static int counter_rpi_pico_timer_get_value(const struct device *dev, uint32_t *ticks)
{
const struct counter_rpi_pico_timer_config *config = dev->config;
*ticks = timer_time_us_32(config->timer);
return 0;
}
static int counter_rpi_pico_timer_set_alarm(const struct device *dev, uint8_t id,
const struct counter_alarm_cfg *alarm_cfg)
{
const struct counter_rpi_pico_timer_config *config = dev->config;
struct counter_rpi_pico_timer_data *data = dev->data;
struct counter_rpi_pico_timer_ch_data *chdata = &data->ch_data[id];
uint64_t target = (alarm_cfg->flags & COUNTER_ALARM_CFG_ABSOLUTE) ? 0 : alarm_cfg->ticks;
absolute_time_t alarm_at;
bool missed;
update_us_since_boot(&alarm_at, config->timer->timerawl + target);
if (alarm_cfg->ticks > counter_rpi_pico_timer_get_top_value(dev)) {
return -EINVAL;
}
if (chdata->callback) {
return -EBUSY;
}
chdata->callback = alarm_cfg->callback;
chdata->user_data = alarm_cfg->user_data;
missed = timer_hardware_alarm_set_target(config->timer, id, alarm_at);
if (missed) {
if (alarm_cfg->flags & COUNTER_ALARM_CFG_EXPIRE_WHEN_LATE) {
timer_hardware_alarm_force_irq(config->timer, id);
}
chdata->callback = NULL;
chdata->user_data = NULL;
return -ETIME;
}
return 0;
}
static int counter_rpi_pico_timer_cancel_alarm(const struct device *dev, uint8_t id)
{
struct counter_rpi_pico_timer_data *data = dev->data;
struct counter_rpi_pico_timer_ch_data *chdata = &data->ch_data[id];
const struct counter_rpi_pico_timer_config *config = dev->config;
chdata->callback = NULL;
chdata->user_data = NULL;
timer_hardware_alarm_cancel(config->timer, id);
return 0;
}
static int counter_rpi_pico_timer_set_top_value(const struct device *dev,
const struct counter_top_cfg *cfg)
{
ARG_UNUSED(dev);
ARG_UNUSED(cfg);
return -ENOTSUP;
}
static uint32_t counter_rpi_pico_timer_get_pending_int(const struct device *dev)
{
return 0;
}
static uint32_t counter_rpi_pico_timer_get_guard_period(const struct device *dev, uint32_t flags)
{
struct counter_rpi_pico_timer_data *data = dev->data;
return data->guard_period;
}
static int counter_rpi_pico_timer_set_guard_period(const struct device *dev, uint32_t guard,
uint32_t flags)
{
struct counter_rpi_pico_timer_data *data = dev->data;
__ASSERT_NO_MSG(guard < counter_rpi_pico_timer_get_top_value(dev));
data->guard_period = guard;
return 0;
}
static void counter_rpi_pico_irq_handle(uint32_t ch, void *arg)
{
struct device *dev = arg;
const struct counter_rpi_pico_timer_config *config = dev->config;
struct counter_rpi_pico_timer_data *data = dev->data;
counter_alarm_callback_t cb = data->ch_data[ch].callback;
void *user_data = data->ch_data[ch].user_data;
if (cb) {
data->ch_data[ch].callback = NULL;
data->ch_data[ch].user_data = NULL;
cb(dev, ch, timer_time_us_32(config->timer), user_data);
}
}
static int counter_rpi_pico_timer_init(const struct device *dev)
{
const struct counter_rpi_pico_timer_config *config = dev->config;
int ret;
ret = clock_control_on(config->clk_dev, config->clk_id);
if (ret < 0) {
return ret;
}
ret = reset_line_toggle_dt(&config->reset);
if (ret < 0) {
return ret;
}
config->irq_config();
return 0;
}
static DEVICE_API(counter, counter_rpi_pico_driver_api) = {
.start = counter_rpi_pico_timer_start,
.stop = counter_rpi_pico_timer_stop,
.get_value = counter_rpi_pico_timer_get_value,
.set_alarm = counter_rpi_pico_timer_set_alarm,
.cancel_alarm = counter_rpi_pico_timer_cancel_alarm,
.set_top_value = counter_rpi_pico_timer_set_top_value,
.get_pending_int = counter_rpi_pico_timer_get_pending_int,
.get_top_value = counter_rpi_pico_timer_get_top_value,
.get_guard_period = counter_rpi_pico_timer_get_guard_period,
.set_guard_period = counter_rpi_pico_timer_set_guard_period,
};
#define RPI_PICO_TIMER_IRQ_ENABLE(node_id, name, idx) \
do { \
timer_hardware_alarm_set_callback((timer_hw_t *)DT_REG_ADDR(node_id), idx, \
counter_rpi_pico_irq_handle); \
IRQ_CONNECT((DT_IRQ_BY_IDX(node_id, idx, irq)), \
(DT_IRQ_BY_IDX(node_id, idx, priority)), hardware_alarm_irq_handler, \
(DEVICE_DT_GET(node_id)), 0); \
irq_enable((DT_IRQ_BY_IDX(node_id, idx, irq))); \
} while (false);
#define COUNTER_RPI_PICO_TIMER(inst) \
static void counter_irq_config##inst(void) \
{ \
DT_INST_FOREACH_PROP_ELEM(inst, interrupt_names, RPI_PICO_TIMER_IRQ_ENABLE); \
} \
static struct counter_rpi_pico_timer_ch_data \
ch_data##inst[DT_NUM_IRQS(DT_DRV_INST(inst))]; \
static struct counter_rpi_pico_timer_data counter_##inst##_data = { \
.ch_data = ch_data##inst, \
}; \
static const struct counter_rpi_pico_timer_config counter_##inst##_config = { \
.timer = (timer_hw_t *)DT_INST_REG_ADDR(inst), \
.irq_config = counter_irq_config##inst, \
.info = \
{ \
.max_top_value = UINT32_MAX, \
.freq = 1000000, \
.flags = COUNTER_CONFIG_INFO_COUNT_UP, \
.channels = ARRAY_SIZE(ch_data##inst), \
}, \
.clk_dev = DEVICE_DT_GET(DT_INST_CLOCKS_CTLR(inst)), \
.clk_id = (clock_control_subsys_t)DT_INST_PHA_BY_IDX(inst, clocks, 0, clk_id), \
.reset = RESET_DT_SPEC_INST_GET(inst), \
}; \
DEVICE_DT_INST_DEFINE(inst, counter_rpi_pico_timer_init, NULL, &counter_##inst##_data, \
&counter_##inst##_config, PRE_KERNEL_1, \
CONFIG_COUNTER_INIT_PRIORITY, &counter_rpi_pico_driver_api);
DT_INST_FOREACH_STATUS_OKAY(COUNTER_RPI_PICO_TIMER)