blob: a9839df37f13fa4e461cf0b306fecbe51e53054f [file] [log] [blame]
/*
* Copyright (c) 2020 Nuvoton Technology Corporation.
*
* SPDX-License-Identifier: Apache-2.0
*/
#define DT_DRV_COMPAT nuvoton_npcx_adc
#include <assert.h>
#include <zephyr/drivers/adc.h>
#include <zephyr/drivers/adc/adc_npcx_threshold.h>
#include <zephyr/drivers/clock_control.h>
#include <zephyr/drivers/pinctrl.h>
#include <zephyr/kernel.h>
#include <zephyr/pm/policy.h>
#include <soc.h>
#define ADC_CONTEXT_USES_KERNEL_TIMER
#include "adc_context.h"
#include <zephyr/logging/log.h>
LOG_MODULE_REGISTER(adc_npcx, CONFIG_ADC_LOG_LEVEL);
/* ADC speed/delay values during initialization */
#define ADC_REGULAR_DLY_VAL 0x03
#define ADC_REGULAR_ADCCNF2_VAL 0x8B07
#define ADC_REGULAR_GENDLY_VAL 0x0100
#define ADC_REGULAR_MEAST_VAL 0x0001
/* ADC channel number */
#define NPCX_ADC_CH_COUNT DT_INST_PROP(0, channel_count)
/* ADC targeted operating frequency (2MHz) */
#define NPCX_ADC_CLK 2000000
/* ADC internal reference voltage (Unit:mV) */
#define NPCX_ADC_VREF_VOL 2816
/* ADC conversion mode */
#define NPCX_ADC_CHN_CONVERSION_MODE 0
#define NPCX_ADC_SCAN_CONVERSION_MODE 1
#define ADC_NPCX_THRVAL_RESOLUTION 10
#define ADC_NPCX_THRVAL_MAX BIT_MASK(ADC_NPCX_THRVAL_RESOLUTION)
#define THRCTL(dev, ctl_no) (*((volatile uint16_t *) npcx_thrctl_reg(dev, ctl_no)))
/* Device config */
struct adc_npcx_config {
/* adc controller base address */
uintptr_t base;
/* clock configuration */
struct npcx_clk_cfg clk_cfg;
/* amount of thresholds supported */
const uint8_t threshold_count;
/* threshold control register offset */
const uint16_t threshold_reg_offset;
const struct pinctrl_dev_config *pcfg;
};
struct adc_npcx_threshold_control {
/*
* Selects ADC channel number, for which the measured data is compared
* for threshold detection.
*/
uint8_t chnsel;
/*
* Sets relation between measured value and assetion threshold value.
* in thrval:
* 0: Threshold event is generated if Measured data > thrval.
* 1: Threshold event is generated if Measured data <= thrval.
*/
bool l_h;
/* Sets the threshold value to which measured data is compared. */
uint16_t thrval;
/*
* Pointer of work queue thread to be notified when threshold assertion
* occurs.
*/
struct k_work *work;
};
struct adc_npcx_threshold_data {
/*
* While threshold interruption is enabled we need to resume to repetitive
* sampling mode after adc_npcx_read is called. This variable records
* channels being used in repetitive mode in order to set ADC registers
* back to threshold detection when adc_npcx_read is completed.
*/
uint16_t repetitive_channels;
/*
* While threshold interruption is enabled, adc_npcx_read must disable
* all active threshold running to avoid race condition, this variable
* helps restore active threshods after adc_npcs_read has finnished.
*/
uint8_t active_thresholds;
/* This array holds current configuration for each threshold. */
struct adc_npcx_threshold_control
control[DT_INST_PROP(0, threshold_count)];
};
/* Driver data */
struct adc_npcx_data {
/* Input clock for ADC converter */
uint32_t input_clk;
/* mutex of ADC channels */
struct adc_context ctx;
/*
* Bit-mask indicating the channels to be included in each sampling
* of this sequence.
*/
uint16_t channels;
/* ADC Device pointer used in api functions */
const struct device *adc_dev;
uint16_t *buffer;
uint16_t *repeat_buffer;
/* end pointer of buffer to ensure enough space for storing ADC data. */
uint16_t *buf_end;
/* Threshold comparator data pointer */
struct adc_npcx_threshold_data *threshold_data;
#ifdef CONFIG_PM
atomic_t current_pm_lock;
#endif
};
/* Driver convenience defines */
#define HAL_INSTANCE(dev) ((struct adc_reg *)((const struct adc_npcx_config *)(dev)->config)->base)
/* ADC local functions */
#ifdef CONFIG_PM
static void adc_npcx_pm_policy_state_lock_get(struct adc_npcx_data *data)
{
if (atomic_test_and_set_bit(&data->current_pm_lock, 0) == 0) {
pm_policy_state_lock_get(PM_STATE_SUSPEND_TO_IDLE, PM_ALL_SUBSTATES);
}
}
static void adc_npcx_pm_policy_state_lock_put(struct adc_npcx_data *data)
{
if (atomic_test_and_clear_bit(&data->current_pm_lock, 0) == 1) {
pm_policy_state_lock_put(PM_STATE_SUSPEND_TO_IDLE, PM_ALL_SUBSTATES);
}
}
#endif
static inline uint32_t npcx_thrctl_reg(const struct device *dev,
uint32_t ctl_no)
{
const struct adc_npcx_config *config = dev->config;
return (config->base + config->threshold_reg_offset) + (ctl_no - 1) * 2;
}
static void adc_npcx_isr(const struct device *dev)
{
const struct adc_npcx_config *config = dev->config;
struct adc_npcx_data *const data = dev->data;
struct adc_reg *const inst = HAL_INSTANCE(dev);
struct adc_npcx_threshold_data *const t_data = data->threshold_data;
uint16_t status = inst->ADCSTS;
uint16_t result, channel;
/* Clear status pending bits first */
inst->ADCSTS = status;
LOG_DBG("%s: status is %04X\n", __func__, status);
/* Is end of conversion cycle event? ie. Scan conversion is done. */
if (IS_BIT_SET(status, NPCX_ADCSTS_EOCCEV) &&
IS_BIT_SET(inst->ADCCNF, NPCX_ADCCNF_INTECCEN)) {
/* Stop conversion for scan conversion mode */
inst->ADCCNF |= BIT(NPCX_ADCCNF_STOP);
/* Get result for each ADC selected channel */
while (data->channels) {
channel = find_lsb_set(data->channels) - 1;
result = GET_FIELD(CHNDAT(config->base, channel),
NPCX_CHNDAT_CHDAT_FIELD);
/*
* Save ADC result and adc_npcx_validate_buffer_size()
* already ensures that the buffer has enough space for
* storing result.
*/
if (data->buffer < data->buf_end) {
*data->buffer++ = result;
}
data->channels &= ~BIT(channel);
}
/* Disable End of cyclic conversion interruption */
inst->ADCCNF &= ~BIT(NPCX_ADCCNF_INTECCEN);
if (IS_ENABLED(CONFIG_ADC_CMP_NPCX) &&
t_data->active_thresholds) {
/* Set repetitive channels back */
inst->ADCCS = t_data->repetitive_channels;
/* Start conversion */
inst->ADCCNF |= BIT(NPCX_ADCCNF_START);
} else {
/* Disable all channels */
inst->ADCCS = 0;
/* Turn off ADC */
inst->ADCCNF &= ~(BIT(NPCX_ADCCNF_ADCEN));
#ifdef CONFIG_PM
adc_npcx_pm_policy_state_lock_put(data);
#endif
}
/* Inform sampling is done */
adc_context_on_sampling_done(&data->ctx, data->adc_dev);
}
if (!(IS_ENABLED(CONFIG_ADC_CMP_NPCX) && t_data->active_thresholds)) {
return;
}
uint16_t thrcts;
for (uint8_t i = 0; i < config->threshold_count; i++) {
if (IS_BIT_SET(inst->THRCTS, i) && IS_BIT_SET(inst->THRCTS,
(NPCX_THRCTS_THR1_IEN + i))) {
/* Avoid clearing other threshold status */
thrcts = inst->THRCTS &
~GENMASK(config->threshold_count - 1, 0);
/* Clear threshold status */
thrcts |= BIT(i);
inst->THRCTS = thrcts;
/* Notify work thread */
if (t_data->control[i].work) {
k_work_submit(t_data->control[i].work);
}
}
}
}
/*
* Validate the buffer size with adc channels mask. If it is lower than what
* we need return -ENOSPC.
*/
static int adc_npcx_validate_buffer_size(const struct device *dev,
const struct adc_sequence *sequence)
{
uint8_t channels = 0;
uint32_t mask;
size_t needed;
for (mask = BIT(NPCX_ADC_CH_COUNT - 1); mask != 0; mask >>= 1) {
if (mask & sequence->channels) {
channels++;
}
}
needed = channels * sizeof(uint16_t);
if (sequence->options) {
needed *= (1 + sequence->options->extra_samplings);
}
if (sequence->buffer_size < needed) {
return -ENOSPC;
}
return 0;
}
static void adc_npcx_start_scan(const struct device *dev)
{
struct adc_npcx_data *const data = dev->data;
struct adc_reg *const inst = HAL_INSTANCE(dev);
#ifdef CONFIG_PM
adc_npcx_pm_policy_state_lock_get(data);
#endif
/* Turn on ADC first */
inst->ADCCNF |= BIT(NPCX_ADCCNF_ADCEN);
/* Stop conversion for scan conversion mode */
inst->ADCCNF |= BIT(NPCX_ADCCNF_STOP);
/* Clear end of cyclic conversion event status flag */
inst->ADCSTS |= BIT(NPCX_ADCSTS_EOCCEV);
/* Update selected channels in scan mode by channels mask */
inst->ADCCS |= data->channels;
/* Select 'Scan' Conversion mode. */
SET_FIELD(inst->ADCCNF, NPCX_ADCCNF_ADCMD_FIELD,
NPCX_ADC_SCAN_CONVERSION_MODE);
/* Enable end of cyclic conversion event interrupt */
inst->ADCCNF |= BIT(NPCX_ADCCNF_INTECCEN);
/* Start conversion */
inst->ADCCNF |= BIT(NPCX_ADCCNF_START);
LOG_DBG("Start ADC scan conversion and ADCCNF,ADCCS are (%04X,%04X)\n",
inst->ADCCNF, inst->ADCCS);
}
static int adc_npcx_start_read(const struct device *dev,
const struct adc_sequence *sequence)
{
struct adc_npcx_data *const data = dev->data;
int error = 0;
if (!sequence->channels ||
(sequence->channels & ~BIT_MASK(NPCX_ADC_CH_COUNT))) {
LOG_ERR("Invalid ADC channels");
return -EINVAL;
}
/* Fixed 10 bit resolution of npcx ADC */
if (sequence->resolution != 10) {
LOG_ERR("Unfixed 10 bit ADC resolution");
return -ENOTSUP;
}
error = adc_npcx_validate_buffer_size(dev, sequence);
if (error) {
LOG_ERR("ADC buffer size too small");
return error;
}
/* Save ADC sequence sampling buffer and its end pointer address */
data->buffer = sequence->buffer;
data->buf_end = data->buffer + sequence->buffer_size / sizeof(uint16_t);
/* Start ADC conversion */
adc_context_start_read(&data->ctx, sequence);
error = adc_context_wait_for_completion(&data->ctx);
return error;
}
/* ADC api functions */
static void adc_context_start_sampling(struct adc_context *ctx)
{
struct adc_npcx_data *const data =
CONTAINER_OF(ctx, struct adc_npcx_data, ctx);
data->repeat_buffer = data->buffer;
data->channels = ctx->sequence.channels;
/* Start ADC scan conversion */
adc_npcx_start_scan(data->adc_dev);
}
static void adc_context_update_buffer_pointer(struct adc_context *ctx,
bool repeat_sampling)
{
struct adc_npcx_data *const data =
CONTAINER_OF(ctx, struct adc_npcx_data, ctx);
if (repeat_sampling) {
data->buffer = data->repeat_buffer;
}
}
static int adc_npcx_channel_setup(const struct device *dev,
const struct adc_channel_cfg *channel_cfg)
{
uint8_t channel_id = channel_cfg->channel_id;
if (channel_id >= NPCX_ADC_CH_COUNT) {
LOG_ERR("Invalid channel %d", channel_id);
return -EINVAL;
}
if (channel_cfg->acquisition_time != ADC_ACQ_TIME_DEFAULT) {
LOG_ERR("Unsupported channel acquisition time");
return -ENOTSUP;
}
if (channel_cfg->differential) {
LOG_ERR("Differential channels are not supported");
return -ENOTSUP;
}
if (channel_cfg->gain != ADC_GAIN_1) {
LOG_ERR("Unsupported channel gain %d", channel_cfg->gain);
return -ENOTSUP;
}
if (channel_cfg->reference != ADC_REF_INTERNAL) {
LOG_ERR("Unsupported channel reference");
return -ENOTSUP;
}
LOG_DBG("ADC channel %d configured", channel_cfg->channel_id);
return 0;
}
static int adc_npcx_read(const struct device *dev,
const struct adc_sequence *sequence)
{
struct adc_npcx_data *const data = dev->data;
int error;
adc_context_lock(&data->ctx, false, NULL);
error = adc_npcx_start_read(dev, sequence);
adc_context_release(&data->ctx, error);
return error;
}
#if defined(CONFIG_ADC_ASYNC)
static int adc_npcx_read_async(const struct device *dev,
const struct adc_sequence *sequence,
struct k_poll_signal *async)
{
struct adc_npcx_data *const data = dev->data;
int error;
adc_context_lock(&data->ctx, true, async);
error = adc_npcx_start_read(dev, sequence);
adc_context_release(&data->ctx, error);
return error;
}
#endif /* CONFIG_ADC_ASYNC */
static void adc_npcx_set_repetitive(const struct device *dev, int chnsel,
uint8_t enable)
{
struct adc_reg *const inst = HAL_INSTANCE(dev);
struct adc_npcx_data *const data = dev->data;
struct adc_npcx_threshold_data *const t_data = data->threshold_data;
/* Stop ADC conversion */
inst->ADCCNF |= BIT(NPCX_ADCCNF_STOP);
if (enable) {
#ifdef CONFIG_PM
adc_npcx_pm_policy_state_lock_get(data);
#endif
/* Turn on ADC */
inst->ADCCNF |= BIT(NPCX_ADCCNF_ADCEN);
/* Set ADC conversion code to SW conversion mode */
SET_FIELD(inst->ADCCNF, NPCX_ADCCNF_ADCMD_FIELD,
NPCX_ADC_SCAN_CONVERSION_MODE);
/* Update number of channel to be converted */
inst->ADCCS |= BIT(chnsel);
/* Set conversion type to repetitive (runs continuously) */
inst->ADCCNF |= BIT(NPCX_ADCCNF_ADCRPTC);
t_data->repetitive_channels |= BIT(chnsel);
/* Start conversion */
inst->ADCCNF |= BIT(NPCX_ADCCNF_START);
} else {
inst->ADCCS &= ~BIT(chnsel);
t_data->repetitive_channels &= ~BIT(chnsel);
if (!t_data->repetitive_channels) {
/* No thesholdd active left, disable repetitive mode */
inst->ADCCNF &= ~BIT(NPCX_ADCCNF_ADCRPTC);
/* Turn off ADC */
inst->ADCCNF &= ~BIT(NPCX_ADCCNF_ADCEN);
#ifdef CONFIG_PM
adc_npcx_pm_policy_state_lock_put(data);
#endif
} else {
/* Start conversion again */
inst->ADCCNF |= BIT(NPCX_ADCCNF_START);
}
}
}
int adc_npcx_threshold_ctrl_set_param(const struct device *dev,
const uint8_t th_sel,
const struct adc_npcx_threshold_param
*param)
{
const struct adc_npcx_config *config = dev->config;
struct adc_npcx_data *const data = dev->data;
struct adc_npcx_threshold_data *const t_data = data->threshold_data;
struct adc_npcx_threshold_control *const t_ctrl =
&t_data->control[th_sel];
int ret = 0;
if (!IS_ENABLED(CONFIG_ADC_CMP_NPCX)) {
return -EOPNOTSUPP;
}
if (!param || th_sel >= config->threshold_count) {
return -EINVAL;
}
adc_context_lock(&data->ctx, false, NULL);
switch (param->type) {
case ADC_NPCX_THRESHOLD_PARAM_CHNSEL:
if (param->val >= NPCX_ADC_CH_COUNT) {
ret = -EINVAL;
break;
}
t_ctrl->chnsel = (uint8_t)param->val;
break;
case ADC_NPCX_THRESHOLD_PARAM_L_H:
t_ctrl->l_h = !!param->val;
break;
case ADC_NPCX_THRESHOLD_PARAM_THVAL:
if (param->val == 0 || param->val >= ADC_NPCX_THRVAL_MAX) {
ret = -EINVAL;
break;
}
t_ctrl->thrval = (uint16_t)param->val;
break;
case ADC_NPCX_THRESHOLD_PARAM_WORK:
if (param->val == 0) {
ret = -EINVAL;
break;
}
t_ctrl->work = (struct k_work *)param->val;
break;
default:
ret = -EINVAL;
}
adc_context_release(&data->ctx, 0);
return ret;
}
static int adc_npcx_threshold_ctrl_setup(const struct device *dev,
const uint8_t th_sel)
{
struct adc_npcx_data *const data = dev->data;
struct adc_npcx_threshold_data *const t_data = data->threshold_data;
const struct adc_npcx_config *config = dev->config;
struct adc_npcx_threshold_control *const t_ctrl =
&t_data->control[th_sel];
if (th_sel >= config->threshold_count) {
return -EINVAL;
}
adc_context_lock(&data->ctx, false, NULL);
if (t_data->active_thresholds & BIT(th_sel)) {
/* Unable to setup threshold parameters while active */
adc_context_release(&data->ctx, 0);
LOG_ERR("Threshold selected (%d) is active!", th_sel);
return -EBUSY;
}
if (t_ctrl->chnsel >= NPCX_ADC_CH_COUNT ||
t_ctrl->thrval >= NPCX_ADC_VREF_VOL ||
t_ctrl->thrval == 0 || t_ctrl->work == 0) {
adc_context_release(&data->ctx, 0);
LOG_ERR("Threshold selected (%d) is not configured!", th_sel);
return -EINVAL;
}
SET_FIELD(THRCTL(dev, (th_sel + 1)),
NPCX_THRCTL_CHNSEL, t_ctrl->chnsel);
if (t_ctrl->l_h) {
THRCTL(dev, (th_sel + 1)) |= BIT(NPCX_THRCTL_L_H);
} else {
THRCTL(dev, (th_sel + 1)) &= ~BIT(NPCX_THRCTL_L_H);
}
/* Set the threshold value. */
SET_FIELD(THRCTL(dev, (th_sel + 1)), NPCX_THRCTL_THRVAL,
t_ctrl->thrval);
adc_context_release(&data->ctx, 0);
return 0;
}
static int adc_npcx_threshold_enable_irq(const struct device *dev,
const uint8_t th_sel)
{
struct adc_reg *const inst = HAL_INSTANCE(dev);
struct adc_npcx_data *const data = dev->data;
const struct adc_npcx_config *config = dev->config;
struct adc_npcx_threshold_data *const t_data = data->threshold_data;
struct adc_npcx_threshold_control *const t_ctrl =
&t_data->control[th_sel];
uint16_t thrcts;
if (th_sel >= config->threshold_count) {
LOG_ERR("Invalid ADC threshold selection! (%d)", th_sel);
return -EINVAL;
}
adc_context_lock(&data->ctx, false, NULL);
if (t_ctrl->chnsel >= NPCX_ADC_CH_COUNT ||
t_ctrl->thrval >= NPCX_ADC_VREF_VOL ||
t_ctrl->thrval == 0 || t_ctrl->work == 0) {
adc_context_release(&data->ctx, 0);
LOG_ERR("Threshold selected (%d) is not configured!", th_sel);
return -EINVAL;
}
/* Record new active threshold */
t_data->active_thresholds |= BIT(th_sel);
/* avoid clearing other threshold status */
thrcts = inst->THRCTS & ~GENMASK(config->threshold_count - 1, 0);
/* Enable threshold detection */
THRCTL(dev, (th_sel + 1)) |= BIT(NPCX_THRCTL_THEN);
/* clear threshold status */
thrcts |= BIT(th_sel);
/* set enable threshold status */
thrcts |= BIT(NPCX_THRCTS_THR1_IEN + th_sel);
inst->THRCTS = thrcts;
adc_npcx_set_repetitive(dev, t_data->control[th_sel].chnsel, true);
adc_context_release(&data->ctx, 0);
return 0;
}
int adc_npcx_threshold_disable_irq(const struct device *dev,
const uint8_t th_sel)
{
struct adc_reg *const inst = HAL_INSTANCE(dev);
const struct adc_npcx_config *config = dev->config;
struct adc_npcx_data *const data = dev->data;
struct adc_npcx_threshold_data *const t_data = data->threshold_data;
uint16_t thrcts;
if (!IS_ENABLED(CONFIG_ADC_CMP_NPCX)) {
return -EOPNOTSUPP;
}
if (th_sel >= config->threshold_count) {
LOG_ERR("Invalid ADC threshold selection! (%d)", th_sel);
return -EINVAL;
}
adc_context_lock(&data->ctx, false, NULL);
if (!(t_data->active_thresholds & BIT(th_sel))) {
adc_context_release(&data->ctx, 0);
LOG_ERR("Threshold selection (%d) is not enabled", th_sel);
return -ENODEV;
}
/* avoid clearing other threshold status */
thrcts = inst->THRCTS & ~GENMASK(config->threshold_count - 1, 0);
/* set enable threshold status */
thrcts &= ~BIT(NPCX_THRCTS_THR1_IEN + th_sel);
inst->THRCTS = thrcts;
/* Disable threshold detection */
THRCTL(dev, (th_sel + 1)) &= ~BIT(NPCX_THRCTL_THEN);
/* Update active threshold */
t_data->active_thresholds &= ~BIT(th_sel);
adc_npcx_set_repetitive(dev, t_data->control[th_sel].chnsel, false);
adc_context_release(&data->ctx, 0);
return 0;
}
int adc_npcx_threshold_ctrl_enable(const struct device *dev, uint8_t th_sel,
const bool enable)
{
int ret;
if (!IS_ENABLED(CONFIG_ADC_CMP_NPCX)) {
return -EOPNOTSUPP;
}
/* Enable/Disable threshold IRQ */
if (enable) {
/* Set control threshold registers */
ret = adc_npcx_threshold_ctrl_setup(dev, th_sel);
if (ret) {
return ret;
}
ret = adc_npcx_threshold_enable_irq(dev, th_sel);
} else {
ret = adc_npcx_threshold_disable_irq(dev, th_sel);
}
return ret;
}
int adc_npcx_threshold_mv_to_thrval(uint32_t val_mv, uint32_t *thrval)
{
if (!IS_ENABLED(CONFIG_ADC_CMP_NPCX)) {
return -EOPNOTSUPP;
}
if (val_mv >= NPCX_ADC_VREF_VOL) {
return -EINVAL;
}
*thrval = (val_mv << ADC_NPCX_THRVAL_RESOLUTION) /
NPCX_ADC_VREF_VOL;
return 0;
}
/* ADC driver registration */
static const struct adc_driver_api adc_npcx_driver_api = {
.channel_setup = adc_npcx_channel_setup,
.read = adc_npcx_read,
#if defined(CONFIG_ADC_ASYNC)
.read_async = adc_npcx_read_async,
#endif
.ref_internal = NPCX_ADC_VREF_VOL,
};
static int adc_npcx_init(const struct device *dev);
PINCTRL_DT_INST_DEFINE(0);
BUILD_ASSERT(DT_NUM_INST_STATUS_OKAY(DT_DRV_COMPAT) == 1,
"only one 'nuvoton_npcx_adc' compatible node may be present");
static const struct adc_npcx_config adc_npcx_cfg_0 = {
.base = DT_INST_REG_ADDR(0),
.clk_cfg = NPCX_DT_CLK_CFG_ITEM(0),
.threshold_count = DT_INST_PROP(0, threshold_count),
.threshold_reg_offset = DT_INST_PROP(0, threshold_reg_offset),
.pcfg = PINCTRL_DT_INST_DEV_CONFIG_GET(0),
};
static struct adc_npcx_threshold_data threshold_data_0;
static struct adc_npcx_data adc_npcx_data_0 = {
ADC_CONTEXT_INIT_TIMER(adc_npcx_data_0, ctx),
ADC_CONTEXT_INIT_LOCK(adc_npcx_data_0, ctx),
ADC_CONTEXT_INIT_SYNC(adc_npcx_data_0, ctx),
};
DEVICE_DT_INST_DEFINE(0,
adc_npcx_init, NULL,
&adc_npcx_data_0, &adc_npcx_cfg_0,
PRE_KERNEL_1,
CONFIG_ADC_INIT_PRIORITY,
&adc_npcx_driver_api);
static int adc_npcx_init(const struct device *dev)
{
const struct adc_npcx_config *const config = dev->config;
struct adc_npcx_data *const data = dev->data;
struct adc_reg *const inst = HAL_INSTANCE(dev);
const struct device *const clk_dev = DEVICE_DT_GET(NPCX_CLK_CTRL_NODE);
int prescaler = 0, ret;
/* Save ADC device in data */
data->adc_dev = dev;
/* Turn on device clock first and get source clock freq. */
ret = clock_control_on(clk_dev, (clock_control_subsys_t *)
&config->clk_cfg);
if (ret < 0) {
LOG_ERR("Turn on ADC clock fail %d", ret);
return ret;
}
ret = clock_control_get_rate(clk_dev, (clock_control_subsys_t *)
&config->clk_cfg, &data->input_clk);
if (ret < 0) {
LOG_ERR("Get ADC clock rate error %d", ret);
return ret;
}
/* Configure the ADC clock */
prescaler = ceiling_fraction(data->input_clk, NPCX_ADC_CLK);
if (prescaler > 0x40)
prescaler = 0x40;
/* Set Core Clock Division Factor in order to obtain the ADC clock */
SET_FIELD(inst->ATCTL, NPCX_ATCTL_SCLKDIV_FIELD, prescaler - 1);
/* Set regular ADC delay */
SET_FIELD(inst->ATCTL, NPCX_ATCTL_DLY_FIELD, ADC_REGULAR_DLY_VAL);
/* Set ADC speed sequentially */
inst->ADCCNF2 = ADC_REGULAR_ADCCNF2_VAL;
inst->GENDLY = ADC_REGULAR_GENDLY_VAL;
inst->MEAST = ADC_REGULAR_MEAST_VAL;
if (IS_ENABLED(CONFIG_ADC_CMP_NPCX)) {
data->threshold_data = &threshold_data_0;
}
/* Configure ADC interrupt and enable it */
IRQ_CONNECT(DT_INST_IRQN(0), DT_INST_IRQ(0, priority), adc_npcx_isr,
DEVICE_DT_INST_GET(0), 0);
irq_enable(DT_INST_IRQN(0));
/* Initialize mutex of ADC channels */
adc_context_unlock_unconditionally(&data->ctx);
/* Configure pin-mux for ADC device */
ret = pinctrl_apply_state(config->pcfg, PINCTRL_STATE_DEFAULT);
if (ret < 0) {
LOG_ERR("ADC pinctrl setup failed (%d)", ret);
return ret;
}
return 0;
}