drivers/adc/adc_dw.c - third_party/github/zephyrproject-rtos/zephyr - Git at Google

 /* adc_dw.c - Designware ADC driver */

 /*
  * Copyright (c) 2015 Intel Corporation
  *
  * SPDX-License-Identifier: Apache-2.0
  */

 #include <errno.h>

 #include <init.h>
 #include <kernel.h>
 #include <string.h>
 #include <stdlib.h>
 #include <soc.h>
 #include <adc.h>
 #include <arch/cpu.h>

 #define ADC_CONTEXT_USES_KERNEL_TIMER
 #include "adc_context.h"
 #include "adc_dw.h"

 #define LOG_LEVEL CONFIG_ADC_LOG_LEVEL
 #include <logging/log.h>
 LOG_MODULE_REGISTER(adc_dw);

 #define ADC_CLOCK_GATE      (1 << 31)
 #define ADC_DEEP_POWER_DOWN  0x01
 #define ADC_POWER_DOWN       0x01
 #define ADC_STANDBY          0x02
 #define ADC_NORMAL_WITH_CALIB  0x03
 #define ADC_NORMAL_WO_CALIB    0x04
 #define ADC_MODE_MASK        0x07

 #define ONE_BIT_SET     0x1
 #define THREE_BITS_SET   0x7
 #define FIVE_BITS_SET   0x1f
 #define SIX_BITS_SET    0x3f
 #define SEVEN_BITS_SET  0xef
 #define ELEVEN_BITS_SET 0x7ff

 #define INPUT_MODE_POS     5
 #define CAPTURE_MODE_POS   6
 #define OUTPUT_MODE_POS    7
 #define SERIAL_DELAY_POS   8
 #define SEQUENCE_MODE_POS  13
 #define SEQ_ENTRIES_POS    16
 #define THRESHOLD_POS      24

 #define SEQ_DELAY_EVEN_POS 5
 #define SEQ_MUX_ODD_POS    16
 #define SEQ_DELAY_ODD_POS  21

 #ifdef CONFIG_SOC_QUARK_SE_C1000_SS
 #define int_unmask(__mask)                                             \
 	sys_write32(sys_read32((__mask)) & ENABLE_SSS_INTERRUPTS, (__mask))
 #else
 #define int_unmask(...) { ; }
 #endif
 static void adc_config_irq(void);


 struct adc_info adc_info_dev = {
 	ADC_CONTEXT_INIT_TIMER(adc_info_dev, ctx),
 	ADC_CONTEXT_INIT_LOCK(adc_info_dev, ctx),
 	ADC_CONTEXT_INIT_SYNC(adc_info_dev, ctx),
 	.state = ADC_STATE_IDLE,
 #ifdef CONFIG_ADC_DW_CALIBRATION
 	.calibration_value = ADC_NONE_CALIBRATION,
 #endif
 };

 #ifdef CONFIG_ADC_DW_CALIBRATION
 static void calibration_command(u8_t command)
 {
 	u32_t state;
 	u32_t reg_value;

 	state = irq_lock();
 	reg_value = sys_in32(PERIPH_ADDR_BASE_CREG_MST0);
 	reg_value |= (command & THREE_BITS_SET) << 17;
 	reg_value |= 0x10000;
 	sys_out32(reg_value, PERIPH_ADDR_BASE_CREG_MST0);
 	irq_unlock(state);
 	/*Poll waiting for command*/
 	do {
 		reg_value = sys_in32(PERIPH_ADDR_BASE_CREG_SLV0);
 	} while ((reg_value & BIT(4)) == 0);

 	/*Clear Calibration Request*/
 	reg_value = sys_in32(PERIPH_ADDR_BASE_CREG_MST0);
 	reg_value &= ~(0x10000);
 	sys_out32(reg_value, PERIPH_ADDR_BASE_CREG_MST0);
 }

 static void adc_goto_normal_mode(struct device *dev)
 {
 	struct adc_info *info = dev->driver_data;
 	u8_t calibration_value;
 	u32_t reg_value;
 	u32_t state;

 	reg_value = sys_in32(PERIPH_ADDR_BASE_CREG_SLV0);

 	if ((reg_value & ADC_MODE_MASK) != ADC_NORMAL_WITH_CALIB) {

 		state = irq_lock();
 		/*Request  Normal With Calibration Mode*/
 		reg_value = sys_in32(PERIPH_ADDR_BASE_CREG_MST0);
 		reg_value &= ~(ADC_MODE_MASK);
 		reg_value |= ADC_NORMAL_WITH_CALIB;
 		sys_out32(reg_value, PERIPH_ADDR_BASE_CREG_MST0);
 		irq_unlock(state);

 		/*Poll waiting for normal mode*/
 		do {
 			reg_value = sys_in32(PERIPH_ADDR_BASE_CREG_SLV0);
 		} while ((reg_value & BIT(3)) == 0);

 		if (info->calibration_value == ADC_NONE_CALIBRATION) {
 			/*Reset Calibration*/
 			calibration_command(ADC_CMD_RESET_CALIBRATION);
 			/*Request Calibration*/
 			calibration_command(ADC_CMD_START_CALIBRATION);
 			reg_value = sys_in32(PERIPH_ADDR_BASE_CREG_SLV0);
 			calibration_value = (reg_value >> 5) & SEVEN_BITS_SET;
 			info->calibration_value = calibration_value;
 		}

 		/*Load Calibration*/
 		reg_value = sys_in32(PERIPH_ADDR_BASE_CREG_MST0);
 		reg_value |= (info->calibration_value << 20);
 		sys_out32(reg_value, PERIPH_ADDR_BASE_CREG_MST0);
 		calibration_command(ADC_CMD_LOAD_CALIBRATION);
 	}
 }

 #else
 static void adc_goto_normal_mode(struct device *dev)
 {
 	u32_t reg_value;
 	u32_t state;

 	ARG_UNUSED(dev);
 	reg_value = sys_in32(PERIPH_ADDR_BASE_CREG_SLV0);

 	if ((reg_value & ADC_MODE_MASK) == ADC_NORMAL_WO_CALIB) {
 		state = irq_lock();
 		/*Request  Power Down*/
 		reg_value = sys_in32(PERIPH_ADDR_BASE_CREG_MST0);

 		reg_value &= ~(ADC_MODE_MASK);
 		reg_value |= ADC_POWER_DOWN;

 		sys_out32(reg_value, PERIPH_ADDR_BASE_CREG_MST0);
 		irq_unlock(state);

 		do {
 			reg_value = sys_in32(PERIPH_ADDR_BASE_CREG_SLV0);
 		} while ((reg_value & BIT(3)) == 0);
 	}

 	/*Request  Normal With Calibration Mode*/
 	state = irq_lock();
 	reg_value = sys_in32(PERIPH_ADDR_BASE_CREG_MST0);
 	reg_value &= ~(ADC_MODE_MASK);
 	reg_value |= ADC_NORMAL_WO_CALIB;
 	sys_out32(reg_value, PERIPH_ADDR_BASE_CREG_MST0);
 	irq_unlock(state);

 	/*Poll waiting for normal mode*/
 	do {
 		reg_value = sys_in32(PERIPH_ADDR_BASE_CREG_SLV0);
 	} while ((reg_value & BIT(3)) == 0);
 }
 #endif

 static int set_resolution(struct device *dev,
 			   const struct adc_sequence *sequence)
 {
 	u32_t tmp_val;
 	const struct adc_config *config = dev->config->config_info;
 	u32_t adc_base = config->reg_base;

 	tmp_val = sys_in32(adc_base + ADC_SET);
 	tmp_val &= ~FIVE_BITS_SET;

 	switch (sequence->resolution) {
 	case 6:
 		break;
 	case 8:
 		tmp_val |= 1 & FIVE_BITS_SET;
 		break;
 	case 10:
 		tmp_val |= 2 & FIVE_BITS_SET;
 		break;
 	case 12:
 		tmp_val |= 3 & FIVE_BITS_SET;
 		break;
 	default:
 		return -EINVAL;
 	}

 	sys_out32(tmp_val, adc_base + ADC_SET);

 	return 0;
 }

 static void adc_dw_enable(struct device *dev)
 {
 	u32_t reg_value;
 	struct adc_info *info = dev->driver_data;
 	const struct adc_config *config = dev->config->config_info;
 	u32_t adc_base = config->reg_base;

 	/*Go to Normal Mode*/
 	sys_out32(ADC_INT_DSB|ENABLE_ADC, adc_base + ADC_CTRL);
 	adc_goto_normal_mode(dev);

 	/*Clock Gate*/
 	reg_value = sys_in32(PERIPH_ADDR_BASE_CREG_MST0);
 	reg_value &= ~(ADC_CLOCK_GATE);
 	sys_out32(reg_value, PERIPH_ADDR_BASE_CREG_MST0);
 	sys_out32(ENABLE_ADC, adc_base + ADC_CTRL);

 	info->state = ADC_STATE_IDLE;
 }

 /* Implementation of the ADC driver API function: adc_channel_setup. */
 static int adc_dw_channel_setup(struct device *dev,
 				  const struct adc_channel_cfg *channel_cfg)
 {
 	u8_t channel_id = channel_cfg->channel_id;
 	struct adc_info *info = dev->driver_data;

 	if (channel_id >= DW_CHANNEL_COUNT) {
 		LOG_ERR("Invalid channel id");
 		return -EINVAL;
 	}

 	if (channel_cfg->gain != ADC_GAIN_1) {
 		LOG_ERR("Invalid channel gain");
 		return -EINVAL;
 	}

 	if (channel_cfg->reference != ADC_REF_INTERNAL) {
 		LOG_ERR("Invalid channel reference");
 		return -EINVAL;
 	}

 	if (channel_cfg->acquisition_time != ADC_ACQ_TIME_DEFAULT) {
 		LOG_ERR("Invalid channel acquisition time");
 		return -EINVAL;
 	}

 	if (info->state != ADC_STATE_IDLE) {
 		LOG_ERR("ADC is busy or in error state");
 		return -EAGAIN;
 	}

 	info->active_channels |= 1 << channel_id;
 	return 0;
 }

 static int adc_dw_read_request(struct device *dev,
 			       const struct adc_sequence *seq_tbl)
 {
 	struct adc_info *info = dev->driver_data;
 	int error = 0;
 	u32_t saved;

 	/*hardware requires minimum 10 us delay between consecutive samples*/
 	if (seq_tbl->options &&
 	    seq_tbl->options->extra_samplings &&
 	    seq_tbl->options->interval_us < 10) {
 		return -EINVAL;
 	}

 	info->channels = seq_tbl->channels & info->active_channels;

 	if (seq_tbl->channels != info->channels) {
 		return -EINVAL;
 	}

 	error = set_resolution(dev, seq_tbl);
 	if (error) {
 		return error;
 	}

 	saved = irq_lock();
 	info->entries = seq_tbl;
 	info->buffer = (u16_t *)seq_tbl->buffer;

 	if (seq_tbl->options) {
 		info->seq_size = seq_tbl->options->extra_samplings + 1;
 	} else {
 		info->seq_size = 1U;
 	}

 	info->state = ADC_STATE_SAMPLING;
 	irq_unlock(saved);

 	adc_context_start_read(&info->ctx, seq_tbl);
 	error = adc_context_wait_for_completion(&info->ctx);

 	if (info->state == ADC_STATE_ERROR) {
 		info->state = ADC_STATE_IDLE;
 		return -EIO;
 	}

 	return error;
 }

 static int adc_dw_read(struct device *dev, const struct adc_sequence *seq_tbl)
 {
 	struct adc_info *info = dev->driver_data;
 	int ret;

 	adc_context_lock(&info->ctx, false, NULL);
 	ret = adc_dw_read_request(dev, seq_tbl);
 	adc_context_release(&info->ctx, ret);

 	return ret;
 }

 #ifdef CONFIG_ADC_ASYNC
 /* Implementation of the ADC driver API function: adc_read_async. */
 static int adc_dw_read_async(struct device *dev,
 			       const struct adc_sequence *sequence,
 			       struct k_poll_signal *async)
 {
 	struct adc_info *info = dev->driver_data;
 	int ret;

 	adc_context_lock(&info->ctx, true, async);
 	ret = adc_dw_read_request(dev, sequence);
 	adc_context_release(&info->ctx, ret);

 	return ret;
 }
 #endif

 static void adc_dw_start_conversion(struct device *dev)
 {
 	struct adc_info *info = dev->driver_data;
 	const struct adc_config *config = info->dev->config->config_info;
 	const struct adc_sequence *entry = info->ctx.sequence;
 	u32_t adc_base = config->reg_base;
 	u32_t ctrl, tmp_val, interval_us = 0U;

 	info->channel_id = find_lsb_set(info->channels) - 1;

 	ctrl = sys_in32(adc_base + ADC_CTRL);
 	ctrl |= ADC_SEQ_PTR_RST;
 	sys_out32(ctrl, adc_base + ADC_CTRL);

 	tmp_val = sys_in32(adc_base + ADC_SET);
 	tmp_val &= ADC_SEQ_SIZE_SET_MASK;
 	sys_out32(tmp_val, adc_base + ADC_SET);

 	if (entry->options) {
 		interval_us = entry->options->interval_us;
 	}
 	tmp_val = ((interval_us & ELEVEN_BITS_SET)
 			<< SEQ_DELAY_EVEN_POS);
 	tmp_val |= (info->channel_id & FIVE_BITS_SET);

 	sys_out32(tmp_val, adc_base + ADC_SEQ);
 	sys_out32(ctrl | ADC_SEQ_PTR_RST, adc_base + ADC_CTRL);

 	sys_out32(START_ADC_SEQ, adc_base + ADC_CTRL);
 }

 static void adc_context_start_sampling(struct adc_context *ctx)
 {
 	struct adc_info *info = CONTAINER_OF(ctx, struct adc_info, ctx);

 	info->channels = ctx->sequence->channels;

 	adc_dw_start_conversion(info->dev);
 }

 static void adc_context_update_buffer_pointer(struct adc_context *ctx,
 					      bool repeat)
 {
 	struct adc_info *info = CONTAINER_OF(ctx, struct adc_info, ctx);
 	const struct adc_sequence *entry = ctx->sequence;

 	if (repeat) {
 		info->buffer = (u16_t *)entry->buffer;
 	}
 }

 int adc_dw_init(struct device *dev)
 {
 	u32_t tmp_val;
 	u32_t val;
 	const struct adc_config *config = dev->config->config_info;
 	u32_t adc_base = config->reg_base;
 	struct adc_info *info = dev->driver_data;

 	sys_out32(ADC_INT_DSB | ADC_CLK_ENABLE, adc_base + ADC_CTRL);

 	tmp_val = sys_in32(adc_base + ADC_SET);
 	tmp_val &= ADC_CONFIG_SET_MASK;
 	val = ((config->capture_mode & ONE_BIT_SET) << CAPTURE_MODE_POS);
 	val |= ((config->out_mode & ONE_BIT_SET) << OUTPUT_MODE_POS);
 	val |= ((config->serial_dly & FIVE_BITS_SET) << SERIAL_DELAY_POS);
 	val |= ((config->seq_mode & ONE_BIT_SET) << SEQUENCE_MODE_POS);
 	val &= ~(1 << INPUT_MODE_POS);
 	sys_out32(tmp_val|val, adc_base + ADC_SET);

 	sys_out32(config->clock_ratio & ADC_CLK_RATIO_MASK,
 		adc_base + ADC_DIVSEQSTAT);

 	sys_out32(ADC_INT_ENABLE & ~(ADC_CLK_ENABLE),
 		adc_base + ADC_CTRL);

 	config->config_func();

 	int_unmask(config->reg_irq_mask);
 	int_unmask(config->reg_err_mask);

 	info->dev = dev;

 	adc_dw_enable(dev);
 	adc_context_unlock_unconditionally(&info->ctx);
 	return 0;
 }

 static void adc_dw_rx_isr(void *arg)
 {
 	struct device *dev = (struct device *)arg;
 	struct adc_info *info = dev->driver_data;
 	const struct adc_config *config = dev->config->config_info;
 	u32_t adc_base = config->reg_base;
 	u32_t reg_val;

 	reg_val = sys_in32(adc_base + ADC_SET);
 	sys_out32(reg_val|ADC_POP_SAMPLE, adc_base + ADC_SET);
 	*info->buffer++ = sys_in32(adc_base + ADC_SAMPLE);

 	/*Resume ADC state to continue new conversions*/
 	sys_out32(RESUME_ADC_CAPTURE, adc_base + ADC_CTRL);
 	reg_val = sys_in32(adc_base + ADC_SET);
 	sys_out32(reg_val | ADC_FLUSH_RX, adc_base + ADC_SET);

 	/*Clear data A register*/
 	reg_val = sys_in32(adc_base + ADC_CTRL);
 	sys_out32(reg_val | ADC_CLR_DATA_A, adc_base + ADC_CTRL);

 	info->state = ADC_STATE_IDLE;
 	info->channels &= ~BIT(info->channel_id);

 	if (info->channels) {
 		adc_dw_start_conversion(dev);
 	} else {
 		adc_context_on_sampling_done(&info->ctx, dev);
 	}
 }

 static void adc_dw_err_isr(void *arg)
 {
 	struct device *dev = (struct device *) arg;
 	const struct adc_config *config = dev->config->config_info;
 	struct adc_info *info = dev->driver_data;
 	u32_t adc_base = config->reg_base;
 	u32_t reg_val = sys_in32(adc_base + ADC_SET);

 	sys_out32(RESUME_ADC_CAPTURE, adc_base + ADC_CTRL);
 	sys_out32(reg_val | ADC_FLUSH_RX, adc_base + ADC_CTRL);
 	sys_out32(FLUSH_ADC_ERRORS, adc_base + ADC_CTRL);

 	info->state = ADC_STATE_ERROR;
 	adc_context_on_sampling_done(&info->ctx, dev);
 }

 static const struct adc_driver_api api_funcs = {
 	.channel_setup = adc_dw_channel_setup,
 	.read          = adc_dw_read,
 #ifdef CONFIG_ADC_ASYNC
 	.read_async    = adc_dw_read_async,
 #endif
 };

 const static struct adc_config adc_config_dev = {
 	.reg_base = DT_ADC_0_BASE_ADDRESS,
 	.reg_irq_mask = SCSS_REGISTER_BASE + INT_SS_ADC_IRQ_MASK,
 	.reg_err_mask = SCSS_REGISTER_BASE + INT_SS_ADC_ERR_MASK,
 #ifdef CONFIG_ADC_DW_SERIAL
 	.out_mode     = 0,
 #elif CONFIG_ADC_DW_PARALLEL
 	.out_mode     = 1,
 #endif
 	.seq_mode = 0,

 #ifdef CONFIG_ADC_DW_RISING_EDGE
 	.capture_mode = 0,
 #elif CONFIG_ADC_DW_FALLING_EDGE
 	.capture_mode = 1,
 #endif
 	.clock_ratio  = CONFIG_ADC_DW_CLOCK_RATIO,
 	.serial_dly   = CONFIG_ADC_DW_SERIAL_DELAY,
 	.config_func  = adc_config_irq,
 };

 DEVICE_AND_API_INIT(adc_dw, DT_ADC_0_NAME, &adc_dw_init,
 		    &adc_info_dev, &adc_config_dev,
 		    POST_KERNEL, CONFIG_KERNEL_INIT_PRIORITY_DEFAULT,
 		    &api_funcs);

 static void adc_config_irq(void)
 {
 	IRQ_CONNECT(DT_ADC_0_IRQ, DT_ADC_0_IRQ_PRI, adc_dw_rx_isr,
 		    DEVICE_GET(adc_dw), 0);
 	irq_enable(DT_ADC_0_IRQ);

 	IRQ_CONNECT(DT_ADC_IRQ_ERR, DT_ADC_0_IRQ_PRI,
 		    adc_dw_err_isr, DEVICE_GET(adc_dw), 0);
 	irq_enable(DT_ADC_IRQ_ERR);
 }
	/* adc_dw.c - Designware ADC driver */

	/*
	* Copyright (c) 2015 Intel Corporation
	*
	* SPDX-License-Identifier: Apache-2.0
	*/

	#include <errno.h>

	#include <init.h>
	#include <kernel.h>
	#include <string.h>
	#include <stdlib.h>
	#include <soc.h>
	#include <adc.h>
	#include <arch/cpu.h>

	#define ADC_CONTEXT_USES_KERNEL_TIMER
	#include "adc_context.h"
	#include "adc_dw.h"

	#define LOG_LEVEL CONFIG_ADC_LOG_LEVEL
	#include <logging/log.h>
	LOG_MODULE_REGISTER(adc_dw);

	#define ADC_CLOCK_GATE (1 << 31)
	#define ADC_DEEP_POWER_DOWN 0x01
	#define ADC_POWER_DOWN 0x01
	#define ADC_STANDBY 0x02
	#define ADC_NORMAL_WITH_CALIB 0x03
	#define ADC_NORMAL_WO_CALIB 0x04
	#define ADC_MODE_MASK 0x07

	#define ONE_BIT_SET 0x1
	#define THREE_BITS_SET 0x7
	#define FIVE_BITS_SET 0x1f
	#define SIX_BITS_SET 0x3f
	#define SEVEN_BITS_SET 0xef
	#define ELEVEN_BITS_SET 0x7ff

	#define INPUT_MODE_POS 5
	#define CAPTURE_MODE_POS 6
	#define OUTPUT_MODE_POS 7
	#define SERIAL_DELAY_POS 8
	#define SEQUENCE_MODE_POS 13
	#define SEQ_ENTRIES_POS 16
	#define THRESHOLD_POS 24

	#define SEQ_DELAY_EVEN_POS 5
	#define SEQ_MUX_ODD_POS 16
	#define SEQ_DELAY_ODD_POS 21

	#ifdef CONFIG_SOC_QUARK_SE_C1000_SS
	#define int_unmask(__mask) \
	sys_write32(sys_read32((__mask)) & ENABLE_SSS_INTERRUPTS, (__mask))
	#else
	#define int_unmask(...) { ; }
	#endif
	static void adc_config_irq(void);


	struct adc_info adc_info_dev = {
	ADC_CONTEXT_INIT_TIMER(adc_info_dev, ctx),
	ADC_CONTEXT_INIT_LOCK(adc_info_dev, ctx),
	ADC_CONTEXT_INIT_SYNC(adc_info_dev, ctx),
	.state = ADC_STATE_IDLE,
	#ifdef CONFIG_ADC_DW_CALIBRATION
	.calibration_value = ADC_NONE_CALIBRATION,
	#endif
	};

	#ifdef CONFIG_ADC_DW_CALIBRATION
	static void calibration_command(u8_t command)
	{
	u32_t state;
	u32_t reg_value;

	state = irq_lock();
	reg_value = sys_in32(PERIPH_ADDR_BASE_CREG_MST0);
	reg_value \|= (command & THREE_BITS_SET) << 17;
	reg_value \|= 0x10000;
	sys_out32(reg_value, PERIPH_ADDR_BASE_CREG_MST0);
	irq_unlock(state);
	/Poll waiting for command/
	do {
	reg_value = sys_in32(PERIPH_ADDR_BASE_CREG_SLV0);
	} while ((reg_value & BIT(4)) == 0);

	/Clear Calibration Request/
	reg_value = sys_in32(PERIPH_ADDR_BASE_CREG_MST0);
	reg_value &= ~(0x10000);
	sys_out32(reg_value, PERIPH_ADDR_BASE_CREG_MST0);
	}

	static void adc_goto_normal_mode(struct device *dev)
	{
	struct adc_info *info = dev->driver_data;
	u8_t calibration_value;
	u32_t reg_value;
	u32_t state;

	reg_value = sys_in32(PERIPH_ADDR_BASE_CREG_SLV0);

	if ((reg_value & ADC_MODE_MASK) != ADC_NORMAL_WITH_CALIB) {

	state = irq_lock();
	/Request Normal With Calibration Mode/
	reg_value = sys_in32(PERIPH_ADDR_BASE_CREG_MST0);
	reg_value &= ~(ADC_MODE_MASK);
	reg_value \|= ADC_NORMAL_WITH_CALIB;
	sys_out32(reg_value, PERIPH_ADDR_BASE_CREG_MST0);
	irq_unlock(state);

	/Poll waiting for normal mode/
	do {
	reg_value = sys_in32(PERIPH_ADDR_BASE_CREG_SLV0);
	} while ((reg_value & BIT(3)) == 0);

	if (info->calibration_value == ADC_NONE_CALIBRATION) {
	/Reset Calibration/
	calibration_command(ADC_CMD_RESET_CALIBRATION);
	/Request Calibration/
	calibration_command(ADC_CMD_START_CALIBRATION);
	reg_value = sys_in32(PERIPH_ADDR_BASE_CREG_SLV0);
	calibration_value = (reg_value >> 5) & SEVEN_BITS_SET;
	info->calibration_value = calibration_value;
	}

	/Load Calibration/
	reg_value = sys_in32(PERIPH_ADDR_BASE_CREG_MST0);
	reg_value \|= (info->calibration_value << 20);
	sys_out32(reg_value, PERIPH_ADDR_BASE_CREG_MST0);
	calibration_command(ADC_CMD_LOAD_CALIBRATION);
	}
	}

	#else
	static void adc_goto_normal_mode(struct device *dev)
	{
	u32_t reg_value;
	u32_t state;

	ARG_UNUSED(dev);
	reg_value = sys_in32(PERIPH_ADDR_BASE_CREG_SLV0);

	if ((reg_value & ADC_MODE_MASK) == ADC_NORMAL_WO_CALIB) {
	state = irq_lock();
	/Request Power Down/
	reg_value = sys_in32(PERIPH_ADDR_BASE_CREG_MST0);

	reg_value &= ~(ADC_MODE_MASK);
	reg_value \|= ADC_POWER_DOWN;

	sys_out32(reg_value, PERIPH_ADDR_BASE_CREG_MST0);
	irq_unlock(state);

	do {
	reg_value = sys_in32(PERIPH_ADDR_BASE_CREG_SLV0);
	} while ((reg_value & BIT(3)) == 0);
	}

	/Request Normal With Calibration Mode/
	state = irq_lock();
	reg_value = sys_in32(PERIPH_ADDR_BASE_CREG_MST0);
	reg_value &= ~(ADC_MODE_MASK);
	reg_value \|= ADC_NORMAL_WO_CALIB;
	sys_out32(reg_value, PERIPH_ADDR_BASE_CREG_MST0);
	irq_unlock(state);

	/Poll waiting for normal mode/
	do {
	reg_value = sys_in32(PERIPH_ADDR_BASE_CREG_SLV0);
	} while ((reg_value & BIT(3)) == 0);
	}
	#endif

	static int set_resolution(struct device *dev,
	const struct adc_sequence *sequence)
	{
	u32_t tmp_val;
	const struct adc_config *config = dev->config->config_info;
	u32_t adc_base = config->reg_base;

	tmp_val = sys_in32(adc_base + ADC_SET);
	tmp_val &= ~FIVE_BITS_SET;

	switch (sequence->resolution) {
	case 6:
	break;
	case 8:
	tmp_val \|= 1 & FIVE_BITS_SET;
	break;
	case 10:
	tmp_val \|= 2 & FIVE_BITS_SET;
	break;
	case 12:
	tmp_val \|= 3 & FIVE_BITS_SET;
	break;
	default:
	return -EINVAL;
	}

	sys_out32(tmp_val, adc_base + ADC_SET);

	return 0;
	}

	static void adc_dw_enable(struct device *dev)
	{
	u32_t reg_value;
	struct adc_info *info = dev->driver_data;
	const struct adc_config *config = dev->config->config_info;
	u32_t adc_base = config->reg_base;

	/Go to Normal Mode/
	sys_out32(ADC_INT_DSB\|ENABLE_ADC, adc_base + ADC_CTRL);
	adc_goto_normal_mode(dev);

	/Clock Gate/
	reg_value = sys_in32(PERIPH_ADDR_BASE_CREG_MST0);
	reg_value &= ~(ADC_CLOCK_GATE);
	sys_out32(reg_value, PERIPH_ADDR_BASE_CREG_MST0);
	sys_out32(ENABLE_ADC, adc_base + ADC_CTRL);

	info->state = ADC_STATE_IDLE;
	}

	/* Implementation of the ADC driver API function: adc_channel_setup. */
	static int adc_dw_channel_setup(struct device *dev,
	const struct adc_channel_cfg *channel_cfg)
	{
	u8_t channel_id = channel_cfg->channel_id;
	struct adc_info *info = dev->driver_data;

	if (channel_id >= DW_CHANNEL_COUNT) {
	LOG_ERR("Invalid channel id");
	return -EINVAL;
	}

	if (channel_cfg->gain != ADC_GAIN_1) {
	LOG_ERR("Invalid channel gain");
	return -EINVAL;
	}

	if (channel_cfg->reference != ADC_REF_INTERNAL) {
	LOG_ERR("Invalid channel reference");
	return -EINVAL;
	}

	if (channel_cfg->acquisition_time != ADC_ACQ_TIME_DEFAULT) {
	LOG_ERR("Invalid channel acquisition time");
	return -EINVAL;
	}

	if (info->state != ADC_STATE_IDLE) {
	LOG_ERR("ADC is busy or in error state");
	return -EAGAIN;
	}

	info->active_channels \|= 1 << channel_id;
	return 0;
	}

	static int adc_dw_read_request(struct device *dev,
	const struct adc_sequence *seq_tbl)
	{
	struct adc_info *info = dev->driver_data;
	int error = 0;
	u32_t saved;

	/hardware requires minimum 10 us delay between consecutive samples/
	if (seq_tbl->options &&
	seq_tbl->options->extra_samplings &&
	seq_tbl->options->interval_us < 10) {
	return -EINVAL;
	}

	info->channels = seq_tbl->channels & info->active_channels;

	if (seq_tbl->channels != info->channels) {
	return -EINVAL;
	}

	error = set_resolution(dev, seq_tbl);
	if (error) {
	return error;
	}

	saved = irq_lock();
	info->entries = seq_tbl;
	info->buffer = (u16_t *)seq_tbl->buffer;

	if (seq_tbl->options) {
	info->seq_size = seq_tbl->options->extra_samplings + 1;
	} else {
	info->seq_size = 1U;
	}

	info->state = ADC_STATE_SAMPLING;
	irq_unlock(saved);

	adc_context_start_read(&info->ctx, seq_tbl);
	error = adc_context_wait_for_completion(&info->ctx);

	if (info->state == ADC_STATE_ERROR) {
	info->state = ADC_STATE_IDLE;
	return -EIO;
	}

	return error;
	}

	static int adc_dw_read(struct device dev, const struct adc_sequence seq_tbl)
	{
	struct adc_info *info = dev->driver_data;
	int ret;

	adc_context_lock(&info->ctx, false, NULL);
	ret = adc_dw_read_request(dev, seq_tbl);
	adc_context_release(&info->ctx, ret);

	return ret;
	}

	#ifdef CONFIG_ADC_ASYNC
	/* Implementation of the ADC driver API function: adc_read_async. */
	static int adc_dw_read_async(struct device *dev,
	const struct adc_sequence *sequence,
	struct k_poll_signal *async)
	{
	struct adc_info *info = dev->driver_data;
	int ret;

	adc_context_lock(&info->ctx, true, async);
	ret = adc_dw_read_request(dev, sequence);
	adc_context_release(&info->ctx, ret);

	return ret;
	}
	#endif

	static void adc_dw_start_conversion(struct device *dev)
	{
	struct adc_info *info = dev->driver_data;
	const struct adc_config *config = info->dev->config->config_info;
	const struct adc_sequence *entry = info->ctx.sequence;
	u32_t adc_base = config->reg_base;
	u32_t ctrl, tmp_val, interval_us = 0U;

	info->channel_id = find_lsb_set(info->channels) - 1;

	ctrl = sys_in32(adc_base + ADC_CTRL);
	ctrl \|= ADC_SEQ_PTR_RST;
	sys_out32(ctrl, adc_base + ADC_CTRL);

	tmp_val = sys_in32(adc_base + ADC_SET);
	tmp_val &= ADC_SEQ_SIZE_SET_MASK;
	sys_out32(tmp_val, adc_base + ADC_SET);

	if (entry->options) {
	interval_us = entry->options->interval_us;
	}
	tmp_val = ((interval_us & ELEVEN_BITS_SET)
	<< SEQ_DELAY_EVEN_POS);
	tmp_val \|= (info->channel_id & FIVE_BITS_SET);

	sys_out32(tmp_val, adc_base + ADC_SEQ);
	sys_out32(ctrl \| ADC_SEQ_PTR_RST, adc_base + ADC_CTRL);

	sys_out32(START_ADC_SEQ, adc_base + ADC_CTRL);
	}

	static void adc_context_start_sampling(struct adc_context *ctx)
	{
	struct adc_info *info = CONTAINER_OF(ctx, struct adc_info, ctx);

	info->channels = ctx->sequence->channels;

	adc_dw_start_conversion(info->dev);
	}

	static void adc_context_update_buffer_pointer(struct adc_context *ctx,
	bool repeat)
	{
	struct adc_info *info = CONTAINER_OF(ctx, struct adc_info, ctx);
	const struct adc_sequence *entry = ctx->sequence;

	if (repeat) {
	info->buffer = (u16_t *)entry->buffer;
	}
	}

	int adc_dw_init(struct device *dev)
	{
	u32_t tmp_val;
	u32_t val;
	const struct adc_config *config = dev->config->config_info;
	u32_t adc_base = config->reg_base;
	struct adc_info *info = dev->driver_data;

	sys_out32(ADC_INT_DSB \| ADC_CLK_ENABLE, adc_base + ADC_CTRL);

	tmp_val = sys_in32(adc_base + ADC_SET);
	tmp_val &= ADC_CONFIG_SET_MASK;
	val = ((config->capture_mode & ONE_BIT_SET) << CAPTURE_MODE_POS);
	val \|= ((config->out_mode & ONE_BIT_SET) << OUTPUT_MODE_POS);
	val \|= ((config->serial_dly & FIVE_BITS_SET) << SERIAL_DELAY_POS);
	val \|= ((config->seq_mode & ONE_BIT_SET) << SEQUENCE_MODE_POS);
	val &= ~(1 << INPUT_MODE_POS);
	sys_out32(tmp_val\|val, adc_base + ADC_SET);

	sys_out32(config->clock_ratio & ADC_CLK_RATIO_MASK,
	adc_base + ADC_DIVSEQSTAT);

	sys_out32(ADC_INT_ENABLE & ~(ADC_CLK_ENABLE),
	adc_base + ADC_CTRL);

	config->config_func();

	int_unmask(config->reg_irq_mask);
	int_unmask(config->reg_err_mask);

	info->dev = dev;

	adc_dw_enable(dev);
	adc_context_unlock_unconditionally(&info->ctx);
	return 0;
	}

	static void adc_dw_rx_isr(void *arg)
	{
	struct device dev = (struct device )arg;
	struct adc_info *info = dev->driver_data;
	const struct adc_config *config = dev->config->config_info;
	u32_t adc_base = config->reg_base;
	u32_t reg_val;

	reg_val = sys_in32(adc_base + ADC_SET);
	sys_out32(reg_val\|ADC_POP_SAMPLE, adc_base + ADC_SET);
	*info->buffer++ = sys_in32(adc_base + ADC_SAMPLE);

	/Resume ADC state to continue new conversions/
	sys_out32(RESUME_ADC_CAPTURE, adc_base + ADC_CTRL);
	reg_val = sys_in32(adc_base + ADC_SET);
	sys_out32(reg_val \| ADC_FLUSH_RX, adc_base + ADC_SET);

	/Clear data A register/
	reg_val = sys_in32(adc_base + ADC_CTRL);
	sys_out32(reg_val \| ADC_CLR_DATA_A, adc_base + ADC_CTRL);

	info->state = ADC_STATE_IDLE;
	info->channels &= ~BIT(info->channel_id);

	if (info->channels) {
	adc_dw_start_conversion(dev);
	} else {
	adc_context_on_sampling_done(&info->ctx, dev);
	}
	}

	static void adc_dw_err_isr(void *arg)
	{
	struct device dev = (struct device ) arg;
	const struct adc_config *config = dev->config->config_info;
	struct adc_info *info = dev->driver_data;
	u32_t adc_base = config->reg_base;
	u32_t reg_val = sys_in32(adc_base + ADC_SET);

	sys_out32(RESUME_ADC_CAPTURE, adc_base + ADC_CTRL);
	sys_out32(reg_val \| ADC_FLUSH_RX, adc_base + ADC_CTRL);
	sys_out32(FLUSH_ADC_ERRORS, adc_base + ADC_CTRL);

	info->state = ADC_STATE_ERROR;
	adc_context_on_sampling_done(&info->ctx, dev);
	}

	static const struct adc_driver_api api_funcs = {
	.channel_setup = adc_dw_channel_setup,
	.read = adc_dw_read,
	#ifdef CONFIG_ADC_ASYNC
	.read_async = adc_dw_read_async,
	#endif
	};

	const static struct adc_config adc_config_dev = {
	.reg_base = DT_ADC_0_BASE_ADDRESS,
	.reg_irq_mask = SCSS_REGISTER_BASE + INT_SS_ADC_IRQ_MASK,
	.reg_err_mask = SCSS_REGISTER_BASE + INT_SS_ADC_ERR_MASK,
	#ifdef CONFIG_ADC_DW_SERIAL
	.out_mode = 0,
	#elif CONFIG_ADC_DW_PARALLEL
	.out_mode = 1,
	#endif
	.seq_mode = 0,

	#ifdef CONFIG_ADC_DW_RISING_EDGE
	.capture_mode = 0,
	#elif CONFIG_ADC_DW_FALLING_EDGE
	.capture_mode = 1,
	#endif
	.clock_ratio = CONFIG_ADC_DW_CLOCK_RATIO,
	.serial_dly = CONFIG_ADC_DW_SERIAL_DELAY,
	.config_func = adc_config_irq,
	};

	DEVICE_AND_API_INIT(adc_dw, DT_ADC_0_NAME, &adc_dw_init,
	&adc_info_dev, &adc_config_dev,
	POST_KERNEL, CONFIG_KERNEL_INIT_PRIORITY_DEFAULT,
	&api_funcs);

	static void adc_config_irq(void)
	{
	IRQ_CONNECT(DT_ADC_0_IRQ, DT_ADC_0_IRQ_PRI, adc_dw_rx_isr,
	DEVICE_GET(adc_dw), 0);
	irq_enable(DT_ADC_0_IRQ);

	IRQ_CONNECT(DT_ADC_IRQ_ERR, DT_ADC_0_IRQ_PRI,
	adc_dw_err_isr, DEVICE_GET(adc_dw), 0);
	irq_enable(DT_ADC_IRQ_ERR);
	}