348 lines
10 KiB
C
348 lines
10 KiB
C
/*
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* Copyright (c) 2018 Diego Sueiro
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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 silabs_gecko_i2c
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#include <errno.h>
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#include <zephyr/drivers/i2c.h>
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#include <zephyr/kernel.h>
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#include <zephyr/sys/util.h>
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#include <em_cmu.h>
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#include <em_i2c.h>
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#include <em_gpio.h>
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#include <soc.h>
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#define LOG_LEVEL CONFIG_I2C_LOG_LEVEL
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#include <zephyr/logging/log.h>
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LOG_MODULE_REGISTER(i2c_gecko);
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#include "i2c-priv.h"
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#define DEV_BASE(dev) ((I2C_TypeDef *)((const struct i2c_gecko_config *const)(dev)->config)->base)
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struct i2c_gecko_config {
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I2C_TypeDef *base;
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CMU_Clock_TypeDef clock;
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uint32_t bitrate;
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struct soc_gpio_pin pin_sda;
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struct soc_gpio_pin pin_scl;
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#ifdef CONFIG_SOC_GECKO_HAS_INDIVIDUAL_PIN_LOCATION
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uint8_t loc_sda;
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uint8_t loc_scl;
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#else
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uint8_t loc;
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#endif
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#if defined(CONFIG_I2C_TARGET)
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void (*irq_config_func)(const struct device *dev);
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#endif
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};
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struct i2c_gecko_data {
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struct k_sem device_sync_sem;
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uint32_t dev_config;
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#if defined(CONFIG_I2C_TARGET)
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struct i2c_target_config *target_cfg;
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#endif
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};
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void i2c_gecko_config_pins(const struct device *dev, const struct soc_gpio_pin *pin_sda,
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const struct soc_gpio_pin *pin_scl)
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{
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I2C_TypeDef *base = DEV_BASE(dev);
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const struct i2c_gecko_config *config = dev->config;
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GPIO_PinModeSet(pin_scl->port, pin_scl->pin, pin_scl->mode, pin_scl->out);
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GPIO_PinModeSet(pin_sda->port, pin_sda->pin, pin_sda->mode, pin_sda->out);
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#ifdef CONFIG_SOC_GECKO_HAS_INDIVIDUAL_PIN_LOCATION
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base->ROUTEPEN = I2C_ROUTEPEN_SDAPEN | I2C_ROUTEPEN_SCLPEN;
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base->ROUTELOC0 = (config->loc_sda << _I2C_ROUTELOC0_SDALOC_SHIFT) |
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(config->loc_scl << _I2C_ROUTELOC0_SCLLOC_SHIFT);
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#elif defined(GPIO_I2C_ROUTEEN_SCLPEN) && defined(GPIO_I2C_ROUTEEN_SDAPEN)
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GPIO->I2CROUTE[I2C_NUM(base)].ROUTEEN = GPIO_I2C_ROUTEEN_SCLPEN | GPIO_I2C_ROUTEEN_SDAPEN;
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GPIO->I2CROUTE[I2C_NUM(base)].SCLROUTE =
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(config->pin_scl.pin << _GPIO_I2C_SCLROUTE_PIN_SHIFT) |
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(config->pin_scl.port << _GPIO_I2C_SCLROUTE_PORT_SHIFT);
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GPIO->I2CROUTE[I2C_NUM(base)].SDAROUTE =
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(config->pin_sda.pin << _GPIO_I2C_SDAROUTE_PIN_SHIFT) |
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(config->pin_sda.port << _GPIO_I2C_SDAROUTE_PORT_SHIFT);
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#else
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base->ROUTE = I2C_ROUTE_SDAPEN | I2C_ROUTE_SCLPEN | (config->loc << 8);
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#endif
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}
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static int i2c_gecko_configure(const struct device *dev, uint32_t dev_config_raw)
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{
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I2C_TypeDef *base = DEV_BASE(dev);
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struct i2c_gecko_data *data = dev->data;
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I2C_Init_TypeDef i2cInit = I2C_INIT_DEFAULT;
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uint32_t baudrate;
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if (!(I2C_MODE_CONTROLLER & dev_config_raw)) {
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return -EINVAL;
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}
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switch (I2C_SPEED_GET(dev_config_raw)) {
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case I2C_SPEED_STANDARD:
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baudrate = KHZ(100);
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break;
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case I2C_SPEED_FAST:
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baudrate = KHZ(400);
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break;
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case I2C_SPEED_FAST_PLUS:
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baudrate = MHZ(1);
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break;
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default:
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return -EINVAL;
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}
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data->dev_config = dev_config_raw;
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i2cInit.freq = baudrate;
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#if defined(CONFIG_I2C_TARGET)
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i2cInit.master = 0;
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#endif
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I2C_Init(base, &i2cInit);
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return 0;
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}
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static int i2c_gecko_transfer(const struct device *dev, struct i2c_msg *msgs, uint8_t num_msgs,
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uint16_t addr)
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{
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I2C_TypeDef *base = DEV_BASE(dev);
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struct i2c_gecko_data *data = dev->data;
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I2C_TransferSeq_TypeDef seq;
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I2C_TransferReturn_TypeDef ret = -EIO;
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uint32_t timeout = 300000U;
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if (!num_msgs) {
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return 0;
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}
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seq.addr = addr << 1;
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do {
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seq.buf[0].data = msgs->buf;
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seq.buf[0].len = msgs->len;
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if ((msgs->flags & I2C_MSG_RW_MASK) == I2C_MSG_READ) {
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seq.flags = I2C_FLAG_READ;
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} else {
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seq.flags = I2C_FLAG_WRITE;
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if (num_msgs > 1) {
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/* Next message */
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msgs++;
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num_msgs--;
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if ((msgs->flags & I2C_MSG_RW_MASK) == I2C_MSG_READ) {
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seq.flags = I2C_FLAG_WRITE_READ;
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} else {
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seq.flags = I2C_FLAG_WRITE_WRITE;
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}
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seq.buf[1].data = msgs->buf;
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seq.buf[1].len = msgs->len;
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}
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}
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if (data->dev_config & I2C_ADDR_10_BITS) {
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seq.flags |= I2C_FLAG_10BIT_ADDR;
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}
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/* Do a polled transfer */
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ret = I2C_TransferInit(base, &seq);
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while (ret == i2cTransferInProgress && timeout--) {
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ret = I2C_Transfer(base);
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}
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if (ret != i2cTransferDone) {
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goto finish;
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}
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/* Next message */
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msgs++;
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num_msgs--;
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} while (num_msgs);
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finish:
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if (ret != i2cTransferDone) {
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ret = -EIO;
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}
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return ret;
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}
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static int i2c_gecko_init(const struct device *dev)
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{
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const struct i2c_gecko_config *config = dev->config;
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uint32_t bitrate_cfg;
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int error;
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CMU_ClockEnable(config->clock, true);
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i2c_gecko_config_pins(dev, &config->pin_sda, &config->pin_scl);
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bitrate_cfg = i2c_map_dt_bitrate(config->bitrate);
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error = i2c_gecko_configure(dev, I2C_MODE_CONTROLLER | bitrate_cfg);
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if (error) {
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return error;
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}
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return 0;
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}
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#if defined(CONFIG_I2C_TARGET)
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static int i2c_gecko_target_register(const struct device *dev, struct i2c_target_config *cfg)
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{
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const struct i2c_gecko_config *config = dev->config;
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struct i2c_gecko_data *data = dev->data;
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data->target_cfg = cfg;
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I2C_SlaveAddressSet(config->base, cfg->address << _I2C_SADDR_ADDR_SHIFT);
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/* Match with specified address, no wildcards in address */
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I2C_SlaveAddressMaskSet(config->base, _I2C_SADDRMASK_SADDRMASK_MASK);
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I2C_IntDisable(config->base, _I2C_IEN_MASK);
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I2C_IntEnable(config->base, I2C_IEN_ADDR | I2C_IEN_RXDATAV | I2C_IEN_ACK | I2C_IEN_SSTOP |
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I2C_IEN_BUSERR | I2C_IEN_ARBLOST);
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config->irq_config_func(dev);
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return 0;
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}
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static int i2c_gecko_target_unregister(const struct device *dev, struct i2c_target_config *cfg)
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{
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const struct i2c_gecko_config *config = dev->config;
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struct i2c_gecko_data *data = dev->data;
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data->target_cfg = NULL;
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I2C_IntDisable(config->base, _I2C_IEN_MASK);
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return 0;
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}
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#endif
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static const struct i2c_driver_api i2c_gecko_driver_api = {
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.configure = i2c_gecko_configure,
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.transfer = i2c_gecko_transfer,
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#if defined(CONFIG_I2C_TARGET)
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.target_register = i2c_gecko_target_register,
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.target_unregister = i2c_gecko_target_unregister,
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#endif
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};
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#if defined(CONFIG_I2C_TARGET)
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void i2c_gecko_isr(const struct device *dev)
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{
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const struct i2c_gecko_config *config = dev->config;
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struct i2c_gecko_data *data = dev->data;
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uint32_t pending;
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uint32_t rx_byte;
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uint8_t tx_byte;
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pending = config->base->IF;
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/* If some sort of fault, abort transfer. */
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if (pending & (I2C_IF_BUSERR | I2C_IF_ARBLOST)) {
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LOG_ERR("I2C Bus Error");
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I2C_IntClear(config->base, I2C_IF_BUSERR);
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I2C_IntClear(config->base, I2C_IF_ARBLOST);
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} else {
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if (pending & I2C_IF_ADDR) {
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/* Address Match, indicating that reception is started */
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rx_byte = config->base->RXDATA;
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config->base->CMD = I2C_CMD_ACK;
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/* Check if read bit set */
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if (rx_byte & 0x1) {
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data->target_cfg->callbacks->read_requested(data->target_cfg,
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&tx_byte);
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config->base->TXDATA = tx_byte;
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} else {
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data->target_cfg->callbacks->write_requested(data->target_cfg);
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}
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I2C_IntClear(config->base, I2C_IF_ADDR | I2C_IF_RXDATAV);
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} else if (pending & I2C_IF_RXDATAV) {
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rx_byte = config->base->RXDATA;
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/* Read new data and write to target address */
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data->target_cfg->callbacks->write_received(data->target_cfg, rx_byte);
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config->base->CMD = I2C_CMD_ACK;
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I2C_IntClear(config->base, I2C_IF_RXDATAV);
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}
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if (pending & I2C_IF_ACK) {
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/* Leader ACK'ed, so requesting more data */
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data->target_cfg->callbacks->read_processed(data->target_cfg, &tx_byte);
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config->base->TXDATA = tx_byte;
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I2C_IntClear(config->base, I2C_IF_ACK);
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}
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if (pending & I2C_IF_SSTOP) {
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/* End of transaction */
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data->target_cfg->callbacks->stop(data->target_cfg);
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I2C_IntClear(config->base, I2C_IF_SSTOP);
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}
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}
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}
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#endif
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#ifdef CONFIG_SOC_GECKO_HAS_INDIVIDUAL_PIN_LOCATION
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#define I2C_LOC_DATA(idx) \
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.loc_sda = DT_INST_PROP_BY_IDX(idx, location_sda, 0), \
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.loc_scl = DT_INST_PROP_BY_IDX(idx, location_scl, 0)
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#define I2C_VALIDATE_LOC(idx) BUILD_ASSERT(true, "")
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#else
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#define I2C_VALIDATE_LOC(idx) \
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BUILD_ASSERT(DT_INST_PROP_BY_IDX(idx, location_sda, 0) == \
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DT_INST_PROP_BY_IDX(idx, location_scl, 0), \
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"DTS location-* properties must be equal")
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#define I2C_LOC_DATA(idx) .loc = DT_INST_PROP_BY_IDX(idx, location_scl, 0)
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#endif
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#if defined(CONFIG_I2C_TARGET)
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#define GECKO_I2C_IRQ_DEF(idx) static void i2c_gecko_config_func_##idx(const struct device *dev);
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#define GECKO_I2C_IRQ_DATA(idx) .irq_config_func = i2c_gecko_config_func_##idx,
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#define GECKO_I2C_IRQ_HANDLER(idx) \
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static void i2c_gecko_config_func_##idx(const struct device *dev) \
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{ \
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IRQ_CONNECT(DT_INST_IRQ(idx, irq), DT_INST_IRQ(idx, priority), i2c_gecko_isr, \
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DEVICE_DT_INST_GET(idx), 0); \
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irq_enable(DT_INST_IRQ(idx, irq)); \
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}
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#else
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#define GECKO_I2C_IRQ_HANDLER(idx)
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#define GECKO_I2C_IRQ_DEF(idx)
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#define GECKO_I2C_IRQ_DATA(idx)
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#endif
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#define I2C_INIT(idx) \
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I2C_VALIDATE_LOC(idx); \
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GECKO_I2C_IRQ_DEF(idx) \
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static const struct i2c_gecko_config i2c_gecko_config_##idx = { \
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.base = (I2C_TypeDef *)DT_INST_REG_ADDR(idx), \
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.clock = cmuClock_I2C##idx, \
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.pin_sda = {DT_INST_PROP_BY_IDX(idx, location_sda, 1), \
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DT_INST_PROP_BY_IDX(idx, location_sda, 2), gpioModeWiredAnd, 1}, \
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.pin_scl = {DT_INST_PROP_BY_IDX(idx, location_scl, 1), \
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DT_INST_PROP_BY_IDX(idx, location_scl, 2), gpioModeWiredAnd, 1}, \
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I2C_LOC_DATA(idx), \
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.bitrate = DT_INST_PROP(idx, clock_frequency), \
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GECKO_I2C_IRQ_DATA(idx)}; \
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static struct i2c_gecko_data i2c_gecko_data_##idx; \
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I2C_DEVICE_DT_INST_DEFINE(idx, i2c_gecko_init, NULL, &i2c_gecko_data_##idx, \
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&i2c_gecko_config_##idx, POST_KERNEL, CONFIG_I2C_INIT_PRIORITY, \
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&i2c_gecko_driver_api); \
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GECKO_I2C_IRQ_HANDLER(idx)
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DT_INST_FOREACH_STATUS_OKAY(I2C_INIT)
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