304 lines
9 KiB
C
304 lines
9 KiB
C
/*
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* Copyright (c) 2025 Realtek, SIBG-SD7
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#define DT_DRV_COMPAT realtek_rts5912_adc
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#include <zephyr/drivers/adc.h>
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#include <zephyr/drivers/clock_control.h>
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#include <zephyr/drivers/clock_control/clock_control_rts5912.h>
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#include <zephyr/drivers/pinctrl.h>
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#include "reg/reg_adc.h"
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#define ADC_CONTEXT_USES_KERNEL_TIMER
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#include "adc_context.h"
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#include <zephyr/logging/log.h>
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LOG_MODULE_REGISTER(adc_rts5912, CONFIG_ADC_LOG_LEVEL);
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#define RTS5912_ADC_MAX_CHAN 12
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#define RTS5912_ADC_POLLING_TIME_MS 1
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#define RTS5912_ADC_ENABLE_TIMEOUT 100
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struct adc_rts5912_config {
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volatile struct adc_regs *regs;
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const struct pinctrl_dev_config *pcfg;
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#ifdef CONFIG_CLOCK_CONTROL
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const struct device *clk_dev;
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struct rts5912_sccon_subsys sccon_cfg;
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#endif
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};
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struct adc_rts5912_data {
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struct adc_context ctx;
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const struct device *adc_dev;
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volatile uint16_t *buffer;
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volatile uint16_t *repeat_buffer;
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uint32_t channels;
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};
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static void adc_context_start_sampling(struct adc_context *ctx)
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{
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struct adc_rts5912_data *data = CONTAINER_OF(ctx, struct adc_rts5912_data, ctx);
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const struct device *adc_dev = data->adc_dev;
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const struct adc_rts5912_config *const cfg = adc_dev->config;
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volatile struct adc_regs *regs = cfg->regs;
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data->repeat_buffer = data->buffer;
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regs->ctrl |= ADC_CTRL_SGLDNINTEN;
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regs->ctrl |= ADC_CTRL_START;
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}
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static void adc_context_update_buffer_pointer(struct adc_context *ctx, bool repeat_sampling)
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{
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struct adc_rts5912_data *data = CONTAINER_OF(ctx, struct adc_rts5912_data, ctx);
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if (repeat_sampling) {
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data->buffer = data->repeat_buffer;
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}
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}
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static int adc_rts5912_channel_setup(const struct device *dev,
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const struct adc_channel_cfg *channel_cfg)
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{
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const struct adc_rts5912_config *const cfg = dev->config;
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volatile struct adc_regs *regs = cfg->regs;
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if (channel_cfg->acquisition_time != ADC_ACQ_TIME_DEFAULT) {
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LOG_ERR("Conversion time not supported!");
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return -EINVAL;
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}
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if (channel_cfg->channel_id >= RTS5912_ADC_MAX_CHAN) {
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LOG_ERR("Channel %d not supported!", channel_cfg->channel_id);
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return -EINVAL;
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}
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if (channel_cfg->gain != ADC_GAIN_1) {
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LOG_ERR("ADC gain not supported!");
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return -EINVAL;
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}
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uint8_t channel_id = channel_cfg->channel_id;
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regs->chctrl |= ((0x01ul << channel_id) | (ADC_CHCTRL_LPFBP << channel_id));
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LOG_DBG("CHCTRL = 0x%08x", regs->chctrl);
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return 0;
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}
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static bool adc_rts5912_validate_buffer_size(const struct adc_sequence *sequence)
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{
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int chan_count = 0;
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size_t buff_need;
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uint32_t chan_mask;
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for (chan_mask = 0x80; chan_mask != 0; chan_mask >>= 1) {
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if (chan_mask & sequence->channels) {
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chan_count++;
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}
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}
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buff_need = chan_count * sizeof(uint16_t);
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if (sequence->options) {
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buff_need *= 1 + sequence->options->extra_samplings;
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}
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if (buff_need > sequence->buffer_size) {
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return false;
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}
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return true;
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}
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static int adc_rts5912_enable(const struct device *dev)
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{
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const struct adc_rts5912_config *const cfg = dev->config;
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volatile struct adc_regs *regs = cfg->regs;
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int64_t st = k_uptime_get();
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regs->ctrl |= ADC_CTRL_EN;
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while ((k_uptime_get() - st) < RTS5912_ADC_ENABLE_TIMEOUT) {
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if (regs->sts & ADC_STS_RDY) {
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return 0;
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}
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k_msleep(RTS5912_ADC_POLLING_TIME_MS);
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}
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LOG_ERR("ADC enable timeout");
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regs->ctrl &= ~ADC_CTRL_EN;
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return -EIO;
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}
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static int adc_rts5912_start_read(const struct device *dev, const struct adc_sequence *sequence)
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{
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struct adc_rts5912_data *const data = dev->data;
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if (sequence->channels & ~BIT_MASK(RTS5912_ADC_MAX_CHAN)) {
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LOG_ERR("Incorrect channels, bitmask 0x%x", sequence->channels);
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return -EINVAL;
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}
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if (sequence->channels == 0UL) {
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LOG_ERR("No channel selected");
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return -EINVAL;
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}
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if (!adc_rts5912_validate_buffer_size(sequence)) {
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LOG_ERR("Incorrect buffer size");
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return -ENOMEM;
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}
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data->channels = sequence->channels;
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data->buffer = sequence->buffer;
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if (adc_rts5912_enable(dev) < 0) {
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return -EIO;
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}
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adc_context_start_read(&data->ctx, sequence);
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return adc_context_wait_for_completion(&data->ctx);
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}
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static int adc_rts5912_read(const struct device *dev, const struct adc_sequence *sequence)
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{
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struct adc_rts5912_data *const data = dev->data;
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int error;
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adc_context_lock(&data->ctx, false, NULL);
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error = adc_rts5912_start_read(dev, sequence);
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adc_context_release(&data->ctx, error);
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return error;
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}
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static void rts5912_adc_get_sample(const struct device *dev)
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{
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const struct adc_rts5912_config *const cfg = dev->config;
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volatile struct adc_regs *regs = cfg->regs;
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struct adc_rts5912_data *const data = dev->data;
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uint32_t idx;
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uint32_t channels = data->channels;
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uint32_t bit;
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/*
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* Using the enabled channel bit set, from
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* lowest channel number to highest, find out
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* which channel is enabled and copy the ADC
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* values from hardware registers to the data
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* buffer.
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*/
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bit = find_lsb_set(channels);
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while (bit != 0) {
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idx = bit - 1;
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*data->buffer = ((uint16_t)regs->chdata[idx] & ADC_CHDATA_RESULT_Msk);
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data->buffer++;
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LOG_DBG("idx=%d, data=%x", idx, regs->chdata[idx]);
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channels &= ~BIT(idx);
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bit = find_lsb_set(channels);
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}
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}
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static void adc_rts5912_single_isr(const struct device *dev)
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{
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const struct adc_rts5912_config *const cfg = dev->config;
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volatile struct adc_regs *regs = cfg->regs;
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struct adc_rts5912_data *const data = dev->data;
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if (regs->sts & ADC_STS_SGLDN) {
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LOG_DBG("single done interrupt triggered.");
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regs->ctrl &= ~(ADC_CTRL_SGLDNINTEN);
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regs->sts &= regs->sts;
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rts5912_adc_get_sample(dev);
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regs->ctrl &= ~ADC_CTRL_EN;
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adc_context_on_sampling_done(&data->ctx, dev);
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}
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}
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static int adc_rts5912_init(const struct device *dev)
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{
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const struct adc_rts5912_config *const cfg = dev->config;
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struct adc_rts5912_data *const data = dev->data;
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volatile struct adc_regs *regs = cfg->regs;
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int ret;
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data->adc_dev = dev;
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ret = pinctrl_apply_state(cfg->pcfg, PINCTRL_STATE_DEFAULT);
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if (ret != 0) {
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LOG_ERR("rts5912 ADC pinctrl setup failed (%d)", ret);
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return ret;
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}
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#ifdef CONFIG_CLOCK_CONTROL
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if (!device_is_ready(cfg->clk_dev)) {
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LOG_ERR("clock \"%s\" device not ready", cfg->clk_dev->name);
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return -ENODEV;
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}
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ret = clock_control_on(cfg->clk_dev, (clock_control_subsys_t)&cfg->sccon_cfg);
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if (ret != 0) {
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LOG_ERR("clock power on fail");
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return ret;
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}
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#endif
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regs->ctrl = ADC_CTRL_RST;
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NVIC_ClearPendingIRQ(DT_INST_IRQN(0));
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IRQ_CONNECT(DT_INST_IRQN(0), DT_INST_IRQ(0, priority), adc_rts5912_single_isr,
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DEVICE_DT_INST_GET(0), 0);
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irq_enable(DT_INST_IRQN(0));
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adc_context_unlock_unconditionally(&data->ctx);
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return 0;
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}
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#define DEV_CONFIG_CLK_DEV_INIT(n) \
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.clk_dev = DEVICE_DT_GET(DT_INST_CLOCKS_CTLR(n)), \
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.sccon_cfg = { \
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.clk_grp = DT_INST_CLOCKS_CELL(n, clk_grp), \
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.clk_idx = DT_INST_CLOCKS_CELL(n, clk_idx), \
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}
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#define ADC_RTS5912_INIT(n) \
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PINCTRL_DT_INST_DEFINE(n); \
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\
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static DEVICE_API(adc, adc_rts5912_api_##n) = { \
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.channel_setup = adc_rts5912_channel_setup, \
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.read = adc_rts5912_read, \
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.ref_internal = DT_INST_PROP(n, vref_mv), \
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}; \
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\
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static struct adc_rts5912_config adc_rts5912_dev_cfg_##n = { \
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.regs = (struct adc_regs *)(DT_INST_REG_ADDR(n)), \
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.pcfg = PINCTRL_DT_INST_DEV_CONFIG_GET(n), \
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DEV_CONFIG_CLK_DEV_INIT(n)}; \
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\
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static struct adc_rts5912_data adc_rts5912_dev_data_##n = { \
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ADC_CONTEXT_INIT_TIMER(adc_rts5912_dev_data_##n, ctx), \
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ADC_CONTEXT_INIT_LOCK(adc_rts5912_dev_data_##n, ctx), \
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ADC_CONTEXT_INIT_SYNC(adc_rts5912_dev_data_##n, ctx), \
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}; \
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\
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DEVICE_DT_INST_DEFINE(n, adc_rts5912_init, NULL, &adc_rts5912_dev_data_##n, \
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&adc_rts5912_dev_cfg_##n, PRE_KERNEL_1, CONFIG_ADC_INIT_PRIORITY, \
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&adc_rts5912_api_##n);
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DT_INST_FOREACH_STATUS_OKAY(ADC_RTS5912_INIT)
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