383 lines
10 KiB
C
383 lines
10 KiB
C
/*
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* Copyright (c) 2020, Seagate Technology LLC
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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 nxp_lpc11u6x_i2c
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#include <zephyr/kernel.h>
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#include <zephyr/drivers/i2c.h>
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#include <zephyr/drivers/clock_control.h>
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#include "i2c_lpc11u6x.h"
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#define DEV_BASE(dev) (((struct lpc11u6x_i2c_config *)(dev->config))->base)
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static void lpc11u6x_i2c_set_bus_speed(const struct lpc11u6x_i2c_config *cfg,
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const struct device *clk_dev,
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uint32_t speed)
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{
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uint32_t clk, div;
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clock_control_get_rate(clk_dev, (clock_control_subsys_t) cfg->clkid,
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&clk);
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div = clk / speed;
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cfg->base->sclh = div / 2;
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cfg->base->scll = div - (div / 2);
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}
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static int lpc11u6x_i2c_configure(const struct device *dev,
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uint32_t dev_config)
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{
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const struct lpc11u6x_i2c_config *cfg = dev->config;
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struct lpc11u6x_i2c_data *data = dev->data;
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uint32_t speed;
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int ret;
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uint8_t mux_selection = PINCTRL_STATE_DEFAULT;
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switch (I2C_SPEED_GET(dev_config)) {
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case I2C_SPEED_STANDARD:
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speed = 100000;
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break;
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case I2C_SPEED_FAST:
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speed = 400000;
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break;
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case I2C_SPEED_FAST_PLUS:
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mux_selection = PINCTRL_STATE_FAST_PLUS;
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speed = 1000000;
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break;
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case I2C_SPEED_HIGH:
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case I2C_SPEED_ULTRA:
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return -ENOTSUP;
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default:
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return -EINVAL;
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}
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if (dev_config & I2C_ADDR_10_BITS) {
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return -ENOTSUP;
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}
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k_mutex_lock(&data->mutex, K_FOREVER);
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lpc11u6x_i2c_set_bus_speed(cfg, cfg->clock_dev, speed);
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ret = pinctrl_apply_state(cfg->pincfg, mux_selection);
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if (ret) {
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k_mutex_unlock(&data->mutex);
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return ret;
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}
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k_mutex_unlock(&data->mutex);
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return 0;
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}
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static int lpc11u6x_i2c_transfer(const struct device *dev,
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struct i2c_msg *msgs,
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uint8_t num_msgs, uint16_t addr)
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{
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const struct lpc11u6x_i2c_config *cfg = dev->config;
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struct lpc11u6x_i2c_data *data = dev->data;
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int ret = 0;
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if (!num_msgs) {
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return 0;
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}
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k_mutex_lock(&data->mutex, K_FOREVER);
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data->transfer.msgs = msgs;
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data->transfer.curr_buf = msgs->buf;
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data->transfer.curr_len = msgs->len;
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data->transfer.nr_msgs = num_msgs;
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data->transfer.addr = addr;
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/* Reset all control bits */
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cfg->base->con_clr = LPC11U6X_I2C_CONTROL_SI |
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LPC11U6X_I2C_CONTROL_STOP | LPC11U6X_I2C_CONTROL_START;
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/* Send start and wait for completion */
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data->transfer.status = LPC11U6X_I2C_STATUS_BUSY;
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cfg->base->con_set = LPC11U6X_I2C_CONTROL_START;
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k_sem_take(&data->completion, K_FOREVER);
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if (data->transfer.status != LPC11U6X_I2C_STATUS_OK) {
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ret = -EIO;
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}
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data->transfer.status = LPC11U6X_I2C_STATUS_INACTIVE;
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/* If a slave is registered, put the controller in slave mode */
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if (data->slave) {
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cfg->base->con_set = LPC11U6X_I2C_CONTROL_AA;
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}
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k_mutex_unlock(&data->mutex);
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return ret;
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}
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static int lpc11u6x_i2c_slave_register(const struct device *dev,
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struct i2c_target_config *cfg)
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{
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const struct lpc11u6x_i2c_config *dev_cfg = dev->config;
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struct lpc11u6x_i2c_data *data = dev->data;
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int ret = 0;
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if (!cfg) {
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return -EINVAL;
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}
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if (cfg->flags & I2C_TARGET_FLAGS_ADDR_10_BITS) {
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return -ENOTSUP;
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}
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k_mutex_lock(&data->mutex, K_FOREVER);
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if (data->slave) {
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ret = -EBUSY;
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goto exit;
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}
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data->slave = cfg;
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/* Configure controller to act as slave */
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dev_cfg->base->addr0 = (cfg->address << 1);
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dev_cfg->base->con_clr = LPC11U6X_I2C_CONTROL_START |
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LPC11U6X_I2C_CONTROL_STOP | LPC11U6X_I2C_CONTROL_SI;
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dev_cfg->base->con_set = LPC11U6X_I2C_CONTROL_AA;
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exit:
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k_mutex_unlock(&data->mutex);
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return ret;
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}
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static int lpc11u6x_i2c_slave_unregister(const struct device *dev,
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struct i2c_target_config *cfg)
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{
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const struct lpc11u6x_i2c_config *dev_cfg = dev->config;
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struct lpc11u6x_i2c_data *data = dev->data;
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if (!cfg) {
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return -EINVAL;
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}
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if (data->slave != cfg) {
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return -EINVAL;
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}
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k_mutex_lock(&data->mutex, K_FOREVER);
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data->slave = NULL;
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dev_cfg->base->con_clr = LPC11U6X_I2C_CONTROL_AA;
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k_mutex_unlock(&data->mutex);
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return 0;
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}
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static void lpc11u6x_i2c_isr(const struct device *dev)
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{
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struct lpc11u6x_i2c_data *data = dev->data;
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struct lpc11u6x_i2c_regs *i2c = DEV_BASE(dev);
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struct lpc11u6x_i2c_current_transfer *transfer = &data->transfer;
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uint32_t clear = LPC11U6X_I2C_CONTROL_SI;
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uint32_t set = 0;
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uint8_t val;
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switch (i2c->stat) {
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/* Master TX states */
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case LPC11U6X_I2C_MASTER_TX_START:
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case LPC11U6X_I2C_MASTER_TX_RESTART:
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i2c->dat = (transfer->addr << 1) |
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(transfer->msgs->flags & I2C_MSG_READ);
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clear |= LPC11U6X_I2C_CONTROL_START;
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transfer->curr_buf = transfer->msgs->buf;
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transfer->curr_len = transfer->msgs->len;
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break;
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case LPC11U6X_I2C_MASTER_TX_ADR_ACK:
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case LPC11U6X_I2C_MASTER_TX_DAT_ACK:
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if (!transfer->curr_len) {
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transfer->msgs++;
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transfer->nr_msgs--;
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if (!transfer->nr_msgs) {
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transfer->status = LPC11U6X_I2C_STATUS_OK;
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set |= LPC11U6X_I2C_CONTROL_STOP;
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} else {
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set |= LPC11U6X_I2C_CONTROL_START;
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}
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} else {
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i2c->dat = transfer->curr_buf[0];
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transfer->curr_buf++;
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transfer->curr_len--;
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}
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break;
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/* Master RX states */
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case LPC11U6X_I2C_MASTER_RX_DAT_NACK:
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transfer->msgs++;
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transfer->nr_msgs--;
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set |= (transfer->nr_msgs ? LPC11U6X_I2C_CONTROL_START :
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LPC11U6X_I2C_CONTROL_STOP);
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if (!transfer->nr_msgs) {
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transfer->status = LPC11U6X_I2C_STATUS_OK;
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}
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__fallthrough;
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case LPC11U6X_I2C_MASTER_RX_DAT_ACK:
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transfer->curr_buf[0] = i2c->dat;
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transfer->curr_buf++;
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transfer->curr_len--;
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__fallthrough;
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case LPC11U6X_I2C_MASTER_RX_ADR_ACK:
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if (transfer->curr_len <= 1) {
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clear |= LPC11U6X_I2C_CONTROL_AA;
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} else {
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set |= LPC11U6X_I2C_CONTROL_AA;
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}
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break;
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/* Slave States */
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case LPC11U6X_I2C_SLAVE_RX_ADR_ACK:
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case LPC11U6X_I2C_SLAVE_RX_ARB_LOST_ADR_ACK:
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case LPC11U6X_I2C_SLAVE_RX_GC_ACK:
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case LPC11U6X_I2C_SLAVE_RX_ARB_LOST_GC_ACK:
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if (data->slave->callbacks->write_requested(data->slave)) {
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clear |= LPC11U6X_I2C_CONTROL_AA;
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}
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break;
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case LPC11U6X_I2C_SLAVE_RX_DAT_ACK:
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case LPC11U6X_I2C_SLAVE_RX_GC_DAT_ACK:
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val = i2c->dat;
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if (data->slave->callbacks->write_received(data->slave, val)) {
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clear |= LPC11U6X_I2C_CONTROL_AA;
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}
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break;
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case LPC11U6X_I2C_SLAVE_RX_DAT_NACK:
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case LPC11U6X_I2C_SLAVE_RX_GC_DAT_NACK:
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val = i2c->dat;
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data->slave->callbacks->write_received(data->slave, val);
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data->slave->callbacks->stop(data->slave);
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set |= LPC11U6X_I2C_CONTROL_AA;
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break;
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case LPC11U6X_I2C_SLAVE_RX_STOP:
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data->slave->callbacks->stop(data->slave);
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set |= LPC11U6X_I2C_CONTROL_AA;
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break;
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case LPC11U6X_I2C_SLAVE_TX_ADR_ACK:
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case LPC11U6X_I2C_SLAVE_TX_ARB_LOST_ADR_ACK:
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if (data->slave->callbacks->read_requested(data->slave, &val)) {
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clear |= LPC11U6X_I2C_CONTROL_AA;
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}
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i2c->dat = val;
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break;
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case LPC11U6X_I2C_SLAVE_TX_DAT_ACK:
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if (data->slave->callbacks->read_processed(data->slave, &val)) {
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clear |= LPC11U6X_I2C_CONTROL_AA;
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}
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i2c->dat = val;
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break;
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case LPC11U6X_I2C_SLAVE_TX_DAT_NACK:
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case LPC11U6X_I2C_SLAVE_TX_LAST_BYTE:
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data->slave->callbacks->stop(data->slave);
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set |= LPC11U6X_I2C_CONTROL_AA;
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break;
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/* Error cases */
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case LPC11U6X_I2C_MASTER_TX_ADR_NACK:
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case LPC11U6X_I2C_MASTER_RX_ADR_NACK:
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case LPC11U6X_I2C_MASTER_TX_DAT_NACK:
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case LPC11U6X_I2C_MASTER_TX_ARB_LOST:
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transfer->status = LPC11U6X_I2C_STATUS_FAIL;
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set = LPC11U6X_I2C_CONTROL_STOP;
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break;
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default:
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set = LPC11U6X_I2C_CONTROL_STOP;
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break;
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}
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i2c->con_clr = clear;
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i2c->con_set = set;
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if ((transfer->status != LPC11U6X_I2C_STATUS_BUSY) &&
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(transfer->status != LPC11U6X_I2C_STATUS_INACTIVE)) {
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k_sem_give(&data->completion);
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}
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}
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static int lpc11u6x_i2c_init(const struct device *dev)
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{
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const struct lpc11u6x_i2c_config *cfg = dev->config;
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struct lpc11u6x_i2c_data *data = dev->data;
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int err;
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err = pinctrl_apply_state(cfg->pincfg, PINCTRL_STATE_DEFAULT);
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if (err) {
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return err;
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}
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if (!device_is_ready(cfg->clock_dev)) {
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return -ENODEV;
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}
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/* Configure clock and de-assert reset for I2Cx */
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clock_control_on(cfg->clock_dev, (clock_control_subsys_t) cfg->clkid);
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/* Configure bus speed. Default is 100KHz */
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lpc11u6x_i2c_set_bus_speed(cfg, cfg->clock_dev, 100000);
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/* Clear all control bytes and enable I2C interface */
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cfg->base->con_clr = LPC11U6X_I2C_CONTROL_AA | LPC11U6X_I2C_CONTROL_SI |
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LPC11U6X_I2C_CONTROL_START | LPC11U6X_I2C_CONTROL_I2C_EN;
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cfg->base->con_set = LPC11U6X_I2C_CONTROL_I2C_EN;
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/* Initialize mutex and semaphore */
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k_mutex_init(&data->mutex);
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k_sem_init(&data->completion, 0, 1);
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data->transfer.status = LPC11U6X_I2C_STATUS_INACTIVE;
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/* Configure IRQ */
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cfg->irq_config_func(dev);
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return 0;
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}
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static const struct i2c_driver_api i2c_api = {
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.configure = lpc11u6x_i2c_configure,
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.transfer = lpc11u6x_i2c_transfer,
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.target_register = lpc11u6x_i2c_slave_register,
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.target_unregister = lpc11u6x_i2c_slave_unregister,
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};
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#define LPC11U6X_I2C_INIT(idx) \
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\
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static void lpc11u6x_i2c_isr_config_##idx(const struct device *dev); \
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\
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PINCTRL_DT_INST_DEFINE(idx); \
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\
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static const struct lpc11u6x_i2c_config i2c_cfg_##idx = { \
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.base = \
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(struct lpc11u6x_i2c_regs *) DT_INST_REG_ADDR(idx), \
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.clock_dev = DEVICE_DT_GET(DT_INST_CLOCKS_CTLR(idx)), \
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.irq_config_func = lpc11u6x_i2c_isr_config_##idx, \
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.pincfg = PINCTRL_DT_INST_DEV_CONFIG_GET(idx), \
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.clkid = DT_INST_PHA_BY_IDX(idx, clocks, 0, clkid), \
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}; \
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\
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static struct lpc11u6x_i2c_data i2c_data_##idx; \
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\
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I2C_DEVICE_DT_INST_DEFINE(idx, \
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lpc11u6x_i2c_init, \
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NULL, \
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&i2c_data_##idx, &i2c_cfg_##idx, \
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PRE_KERNEL_1, CONFIG_I2C_INIT_PRIORITY, \
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&i2c_api); \
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\
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static void lpc11u6x_i2c_isr_config_##idx(const struct device *dev) \
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{ \
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IRQ_CONNECT(DT_INST_IRQN(idx), \
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DT_INST_IRQ(idx, priority), \
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lpc11u6x_i2c_isr, DEVICE_DT_INST_GET(idx), 0); \
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\
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irq_enable(DT_INST_IRQN(idx)); \
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}
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DT_INST_FOREACH_STATUS_OKAY(LPC11U6X_I2C_INIT);
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