|  | /* | 
|  | * Copyright (c) 2022 Florin Stancu <niflostancu@gmail.com> | 
|  | * | 
|  | * SPDX-License-Identifier: Apache-2.0 | 
|  | */ | 
|  |  | 
|  | #define DT_DRV_COMPAT ti_cc13xx_cc26xx_adc | 
|  |  | 
|  | #include <errno.h> | 
|  |  | 
|  | #define LOG_LEVEL CONFIG_ADC_LOG_LEVEL | 
|  | #include <zephyr/logging/log.h> | 
|  | LOG_MODULE_REGISTER(adc_cc13xx_cc26xx); | 
|  |  | 
|  | #include <zephyr/device.h> | 
|  | #include <zephyr/kernel.h> | 
|  | #include <zephyr/init.h> | 
|  | #include <zephyr/drivers/adc.h> | 
|  | #include <soc.h> | 
|  |  | 
|  | /* Driverlib includes */ | 
|  | #include <inc/hw_types.h> | 
|  | #include <driverlib/interrupt.h> | 
|  | #include <driverlib/ioc.h> | 
|  | #include <driverlib/rom.h> | 
|  | #include <driverlib/prcm.h> | 
|  | #include <driverlib/aux_adc.h> | 
|  | #include <ti/devices/cc13x2_cc26x2/inc/hw_aux_evctl.h> | 
|  |  | 
|  | #define ADC_CONTEXT_USES_KERNEL_TIMER | 
|  | #include "adc_context.h" | 
|  |  | 
|  |  | 
|  | /** | 
|  | * Channels are based on ADC_COMPB_IN_* hal_ti definitions, max. index is 16 (included). | 
|  | */ | 
|  | #define MAX_CHAN_ID 0x10 | 
|  |  | 
|  | /** Internal sample time unit conversion entry. */ | 
|  | struct adc_cc13xx_cc26xx_sample_time_entry { | 
|  | uint16_t time_us; | 
|  | uint8_t reg_value; | 
|  | }; | 
|  |  | 
|  | /** Maps standard unit sample times (us) to internal (raw hal_ti register) values */ | 
|  | static const struct adc_cc13xx_cc26xx_sample_time_entry adc_cc13xx_sample_times[] = { | 
|  | { 2, AUXADC_SAMPLE_TIME_2P7_US }, | 
|  | { 5, AUXADC_SAMPLE_TIME_5P3_US }, | 
|  | { 10, AUXADC_SAMPLE_TIME_10P6_US }, | 
|  | { 21, AUXADC_SAMPLE_TIME_21P3_US }, | 
|  | { 42, AUXADC_SAMPLE_TIME_42P6_US }, | 
|  | { 85, AUXADC_SAMPLE_TIME_85P3_US }, | 
|  | { 170, AUXADC_SAMPLE_TIME_170_US }, | 
|  | { 341, AUXADC_SAMPLE_TIME_341_US }, | 
|  | { 682, AUXADC_SAMPLE_TIME_682_US }, | 
|  | { 1370, AUXADC_SAMPLE_TIME_1P37_MS }, | 
|  | { 2730, AUXADC_SAMPLE_TIME_2P73_MS }, | 
|  | { 5460, AUXADC_SAMPLE_TIME_5P46_MS }, | 
|  | { 10900, AUXADC_SAMPLE_TIME_10P9_MS }, | 
|  | }; | 
|  |  | 
|  | struct adc_cc13xx_cc26xx_data { | 
|  | struct adc_context ctx; | 
|  | const struct device *dev; | 
|  | uint32_t ref_source; | 
|  | uint8_t sample_time; | 
|  | uint16_t *buffer; | 
|  | uint16_t *repeat_buffer; | 
|  | }; | 
|  |  | 
|  | struct adc_cc13xx_cc26xx_cfg { | 
|  | unsigned long base; | 
|  | void (*irq_cfg_func)(void); | 
|  | }; | 
|  |  | 
|  |  | 
|  | static void adc_cc13xx_cc26xx_isr(const struct device *dev); | 
|  |  | 
|  |  | 
|  | static void adc_context_start_sampling(struct adc_context *ctx) | 
|  | { | 
|  | struct adc_cc13xx_cc26xx_data *data = | 
|  | CONTAINER_OF(ctx, struct adc_cc13xx_cc26xx_data, ctx); | 
|  |  | 
|  | data->repeat_buffer = data->buffer; | 
|  |  | 
|  | AUXADCEnableSync(data->ref_source, data->sample_time, AUXADC_TRIGGER_MANUAL); | 
|  | AUXADCGenManualTrigger(); | 
|  | } | 
|  |  | 
|  | static void adc_context_update_buffer_pointer(struct adc_context *ctx, | 
|  | bool repeat) | 
|  | { | 
|  | struct adc_cc13xx_cc26xx_data *data = | 
|  | CONTAINER_OF(ctx, struct adc_cc13xx_cc26xx_data, ctx); | 
|  |  | 
|  | if (repeat) { | 
|  | data->buffer = data->repeat_buffer; | 
|  | } else { | 
|  | data->buffer++; | 
|  | } | 
|  | } | 
|  |  | 
|  | static int adc_cc13xx_cc26xx_init(const struct device *dev) | 
|  | { | 
|  | struct adc_cc13xx_cc26xx_data *data = dev->data; | 
|  | const struct adc_cc13xx_cc26xx_cfg *config = dev->config; | 
|  |  | 
|  | data->dev = dev; | 
|  |  | 
|  | /* clear any previous events */ | 
|  | AUXADCDisable(); | 
|  | HWREG(AUX_EVCTL_BASE + AUX_EVCTL_O_EVTOMCUFLAGSCLR) = | 
|  | (AUX_EVCTL_EVTOMCUFLAGS_AUX_ADC_IRQ | AUX_EVCTL_EVTOMCUFLAGS_AUX_ADC_DONE); | 
|  |  | 
|  | config->irq_cfg_func(); | 
|  |  | 
|  | adc_context_unlock_unconditionally(&data->ctx); | 
|  | return 0; | 
|  | } | 
|  |  | 
|  | static int adc_cc13xx_cc26xx_channel_setup(const struct device *dev, | 
|  | const struct adc_channel_cfg *channel_cfg) | 
|  | { | 
|  | struct adc_cc13xx_cc26xx_data *data = dev->data; | 
|  | const uint8_t ch = channel_cfg->channel_id; | 
|  | uint16_t sample_time_us = 0; | 
|  | uint8_t i; | 
|  |  | 
|  | if (ch > MAX_CHAN_ID) { | 
|  | LOG_ERR("Channel 0x%X is not supported, max 0x%X", ch, MAX_CHAN_ID); | 
|  | return -EINVAL; | 
|  | } | 
|  |  | 
|  | switch (ADC_ACQ_TIME_UNIT(channel_cfg->acquisition_time)) { | 
|  | case ADC_ACQ_TIME_TICKS: | 
|  | data->sample_time = (uint16_t)ADC_ACQ_TIME_VALUE(channel_cfg->acquisition_time); | 
|  | break; | 
|  | case ADC_ACQ_TIME_MICROSECONDS: | 
|  | sample_time_us = (uint16_t)ADC_ACQ_TIME_VALUE(channel_cfg->acquisition_time); | 
|  | break; | 
|  | case ADC_ACQ_TIME_NANOSECONDS: | 
|  | sample_time_us = (uint16_t)( | 
|  | ADC_ACQ_TIME_VALUE(channel_cfg->acquisition_time) * 1000); | 
|  | break; | 
|  | default: | 
|  | data->sample_time = AUXADC_SAMPLE_TIME_170_US; | 
|  | break; | 
|  | } | 
|  | if (sample_time_us) { | 
|  | /* choose the nearest sample time configuration */ | 
|  | data->sample_time = adc_cc13xx_sample_times[0].reg_value; | 
|  | for (i = 0; i < ARRAY_SIZE(adc_cc13xx_sample_times); i++) { | 
|  | if (adc_cc13xx_sample_times[i].time_us >= sample_time_us) { | 
|  | break; | 
|  | } | 
|  | data->sample_time = adc_cc13xx_sample_times[i].reg_value; | 
|  | } | 
|  | if (i >= ARRAY_SIZE(adc_cc13xx_sample_times)) { | 
|  | LOG_ERR("Acquisition time is not valid"); | 
|  | return -EINVAL; | 
|  | } | 
|  | } | 
|  |  | 
|  | if (channel_cfg->differential) { | 
|  | LOG_ERR("Differential channels are not supported"); | 
|  | return -EINVAL; | 
|  | } | 
|  |  | 
|  | if (channel_cfg->gain != ADC_GAIN_1) { | 
|  | LOG_ERR("Gain is not valid"); | 
|  | return -EINVAL; | 
|  | } | 
|  |  | 
|  | if (channel_cfg->reference == ADC_REF_INTERNAL) { | 
|  | data->ref_source = AUXADC_REF_FIXED; | 
|  | } else if (channel_cfg->reference == ADC_REF_VDD_1) { | 
|  | data->ref_source = AUXADC_REF_VDDS_REL; | 
|  | } else { | 
|  | LOG_ERR("Reference is not valid"); | 
|  | return -EINVAL; | 
|  | } | 
|  |  | 
|  | LOG_DBG("Setup %d acq time %d", ch, data->sample_time); | 
|  |  | 
|  | AUXADCDisable(); | 
|  | AUXADCSelectInput(ch); | 
|  | return 0; | 
|  | } | 
|  |  | 
|  | static int cc13xx_cc26xx_read(const struct device *dev, | 
|  | const struct adc_sequence *sequence, | 
|  | bool asynchronous, | 
|  | struct k_poll_signal *sig) | 
|  | { | 
|  | struct adc_cc13xx_cc26xx_data *data = dev->data; | 
|  | int rv; | 
|  | size_t exp_size; | 
|  |  | 
|  | if (sequence->resolution != 12) { | 
|  | LOG_ERR("Only 12 Resolution is supported, but %d got", | 
|  | sequence->resolution); | 
|  | return -EINVAL; | 
|  | } | 
|  |  | 
|  | exp_size = sizeof(uint16_t); | 
|  | if (sequence->options) { | 
|  | exp_size *= (1 + sequence->options->extra_samplings); | 
|  | } | 
|  |  | 
|  | if (sequence->buffer_size < exp_size) { | 
|  | LOG_ERR("Required buffer size is %u, but %u got", | 
|  | exp_size, sequence->buffer_size); | 
|  | return -ENOMEM; | 
|  | } | 
|  |  | 
|  | data->buffer = sequence->buffer; | 
|  |  | 
|  | adc_context_lock(&data->ctx, asynchronous, sig); | 
|  | adc_context_start_read(&data->ctx, sequence); | 
|  | rv = adc_context_wait_for_completion(&data->ctx); | 
|  | adc_context_release(&data->ctx, rv); | 
|  | return rv; | 
|  | } | 
|  |  | 
|  | static int adc_cc13xx_cc26xx_read(const struct device *dev, | 
|  | const struct adc_sequence *sequence) | 
|  | { | 
|  | return cc13xx_cc26xx_read(dev, sequence, false, NULL); | 
|  | } | 
|  |  | 
|  | #ifdef CONFIG_ADC_ASYNC | 
|  | static int adc_cc13xx_cc26xx_read_async(const struct device *dev, | 
|  | const struct adc_sequence *sequence, | 
|  | struct k_poll_signal *async) | 
|  | { | 
|  | return cc13xx_cc26xx_read(dev, sequence, true, async); | 
|  | } | 
|  | #endif | 
|  |  | 
|  | /** | 
|  | * AUX_ADC_IRQ handler, called for either of these events: | 
|  | * - conversion complete or DMA done (if used); | 
|  | * - FIFO underflow or overflow; | 
|  | */ | 
|  | static void adc_cc13xx_cc26xx_isr(const struct device *dev) | 
|  | { | 
|  | struct adc_cc13xx_cc26xx_data *data = dev->data; | 
|  | /* get the statuses of ADC_DONE and ADC_IRQ events in order to clear them both */ | 
|  | uint32_t ev_status = ( | 
|  | HWREG(AUX_EVCTL_BASE + AUX_EVCTL_O_EVTOMCUFLAGS) & | 
|  | (AUX_EVCTL_EVTOMCUFLAGS_AUX_ADC_IRQ | AUX_EVCTL_EVTOMCUFLAGS_AUX_ADC_DONE) | 
|  | ); | 
|  | uint32_t fifo_status; | 
|  | uint32_t adc_value; | 
|  |  | 
|  | /* clear the AUXADC-related event flags */ | 
|  | HWREG(AUX_EVCTL_BASE + AUX_EVCTL_O_EVTOMCUFLAGSCLR) = ev_status; | 
|  | /* check the ADC FIFO's status */ | 
|  | fifo_status = AUXADCGetFifoStatus(); | 
|  | LOG_DBG("ISR flags 0x%08X fifo 0x%08X", ev_status, fifo_status); | 
|  | if ((fifo_status & (AUX_ANAIF_ADCFIFOSTAT_OVERFLOW | AUX_ANAIF_ADCFIFOSTAT_UNDERFLOW))) { | 
|  | AUXADCFlushFifo(); | 
|  | } | 
|  | if ((fifo_status & AUX_ANAIF_ADCFIFOSTAT_EMPTY_M)) { | 
|  | /* no ADC values available */ | 
|  | return; | 
|  | } | 
|  | adc_value = AUXADCPopFifo(); | 
|  | LOG_DBG("ADC buf %04X val %d", (unsigned int)data->buffer, adc_value); | 
|  | *data->buffer = adc_value; | 
|  | AUXADCDisable(); | 
|  |  | 
|  | adc_context_on_sampling_done(&data->ctx, dev); | 
|  | } | 
|  |  | 
|  | static DEVICE_API(adc, cc13xx_cc26xx_driver_api) = { | 
|  | .channel_setup = adc_cc13xx_cc26xx_channel_setup, | 
|  | .read = adc_cc13xx_cc26xx_read, | 
|  | #ifdef CONFIG_ADC_ASYNC | 
|  | .read_async = adc_cc13xx_cc26xx_read_async, | 
|  | #endif | 
|  | .ref_internal = 4300, /* fixed reference: 4.3V */ | 
|  | }; | 
|  |  | 
|  | #define CC13XX_CC26XX_ADC_INIT(index)						 \ | 
|  | static void adc_cc13xx_cc26xx_cfg_func_##index(void);			 \ | 
|  | static const struct adc_cc13xx_cc26xx_cfg adc_cc13xx_cc26xx_cfg_##index = { \ | 
|  | .base = DT_INST_REG_ADDR(index),				 \ | 
|  | .irq_cfg_func = adc_cc13xx_cc26xx_cfg_func_##index,		 \ | 
|  | };									 \ | 
|  | static struct adc_cc13xx_cc26xx_data adc_cc13xx_cc26xx_data_##index = { \ | 
|  | ADC_CONTEXT_INIT_TIMER(adc_cc13xx_cc26xx_data_##index, ctx),	 \ | 
|  | ADC_CONTEXT_INIT_LOCK(adc_cc13xx_cc26xx_data_##index, ctx),	 \ | 
|  | ADC_CONTEXT_INIT_SYNC(adc_cc13xx_cc26xx_data_##index, ctx),	 \ | 
|  | };									 \ | 
|  | DEVICE_DT_INST_DEFINE(index,						 \ | 
|  | adc_cc13xx_cc26xx_init, NULL,					 \ | 
|  | &adc_cc13xx_cc26xx_data_##index,				 \ | 
|  | &adc_cc13xx_cc26xx_cfg_##index, POST_KERNEL,			 \ | 
|  | CONFIG_ADC_INIT_PRIORITY,					 \ | 
|  | &cc13xx_cc26xx_driver_api);					 \ | 
|  | \ | 
|  | static void adc_cc13xx_cc26xx_cfg_func_##index(void)			 \ | 
|  | {									 \ | 
|  | IRQ_CONNECT(DT_INST_IRQN(index), DT_INST_IRQ(index, priority),	 \ | 
|  | adc_cc13xx_cc26xx_isr, DEVICE_DT_INST_GET(index), 0); \ | 
|  | irq_enable(DT_INST_IRQN(index));				 \ | 
|  | } | 
|  |  | 
|  | DT_INST_FOREACH_STATUS_OKAY(CC13XX_CC26XX_ADC_INIT) |