157 lines
4.6 KiB
C
157 lines
4.6 KiB
C
/*
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* Copyright (c) 2020 Nuvoton Technology Corporation.
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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 nuvoton_npcx_i2c_port
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/**
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* @file
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* @brief Nuvoton NPCX smb/i2c port driver
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*
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* This file contains the driver of SMBus/I2C buses (ports) which provides
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* pin-muxing for each i2c io-pads. In order to support "SMBus Multi-Bus"
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* feature, please refer the diagram below, the driver alsp provides connection
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* between Zephyr i2c api functions and i2c controller driver which provides
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* full support for SMBus/I2C transactions.
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*
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* Port SEL
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* |
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* |\|
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* SCL_N Port 0----| \ +--------------+
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* SDA_N Port 0----| |----| SMB/I2C |
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* | |----| Controller N |
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* SCL_N Port 1----| | +--------------+
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* SDA_N Port 1----| /
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* |/
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*
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*/
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#include <assert.h>
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#include <drivers/clock_control.h>
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#include <drivers/i2c.h>
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#include <dt-bindings/i2c/i2c.h>
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#include <soc.h>
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#include <logging/log.h>
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LOG_MODULE_REGISTER(i2c_npcx_port, LOG_LEVEL_ERR);
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#include "i2c_npcx_controller.h"
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#include "i2c-priv.h"
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/* Device config */
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struct i2c_npcx_port_config {
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/* pinmux configuration */
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const uint8_t alts_size;
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const struct npcx_alt *alts_list;
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uint32_t bitrate;
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uint8_t port;
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const struct device *i2c_ctrl;
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};
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/* Driver convenience defines */
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#define DRV_CONFIG(dev) \
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((const struct i2c_npcx_port_config *)(dev)->config)
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/* I2C api functions */
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static int i2c_npcx_port_configure(const struct device *dev,
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uint32_t dev_config)
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{
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const struct i2c_npcx_port_config *const config = DRV_CONFIG(dev);
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if (config->i2c_ctrl == NULL) {
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LOG_ERR("Cannot find i2c controller on port%02x!",
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config->port);
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return -EIO;
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}
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if (!(dev_config & I2C_MODE_MASTER)) {
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return -ENOTSUP;
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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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/* Configure i2c controller */
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return npcx_i2c_ctrl_configure(config->i2c_ctrl, dev_config);
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}
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static int i2c_npcx_port_transfer(const struct device *dev,
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struct i2c_msg *msgs, uint8_t num_msgs, uint16_t addr)
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{
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const struct i2c_npcx_port_config *const config = DRV_CONFIG(dev);
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int ret = 0;
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int idx_ctrl = (config->port & 0xF0) >> 4;
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int idx_port = (config->port & 0x0F);
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if (config->i2c_ctrl == NULL) {
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LOG_ERR("Cannot find i2c controller on port%02x!",
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config->port);
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return -EIO;
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}
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/* Lock mutex of i2c/smb controller */
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npcx_i2c_ctrl_mutex_lock(config->i2c_ctrl);
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/* Switch correct port for i2c controller first */
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npcx_pinctrl_i2c_port_sel(idx_ctrl, idx_port);
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/* Start transaction with i2c controller */
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ret = npcx_i2c_ctrl_transfer(config->i2c_ctrl, msgs, num_msgs, addr,
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config->port);
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/* Unlock mutex of i2c/smb controller */
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npcx_i2c_ctrl_mutex_unlock(config->i2c_ctrl);
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return ret;
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}
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/* I2C driver registration */
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static int i2c_npcx_port_init(const struct device *dev)
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{
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const struct i2c_npcx_port_config *const config = DRV_CONFIG(dev);
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uint32_t i2c_config;
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int ret;
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/* Configure pin-mux for I2C device */
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npcx_pinctrl_mux_configure(config->alts_list, config->alts_size, 1);
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/* Setup initial i2c configuration */
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i2c_config = (I2C_MODE_MASTER | i2c_map_dt_bitrate(config->bitrate));
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ret = i2c_npcx_port_configure(dev, i2c_config);
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if (ret != 0) {
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return ret;
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}
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return 0;
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}
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static const struct i2c_driver_api i2c_port_npcx_driver_api = {
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.configure = i2c_npcx_port_configure,
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.transfer = i2c_npcx_port_transfer,
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};
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/* I2C port init macro functions */
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#define NPCX_I2C_PORT_INIT(inst) \
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static const struct npcx_alt i2c_port_alts##inst[] = \
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NPCX_DT_ALT_ITEMS_LIST(inst); \
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\
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static const struct i2c_npcx_port_config i2c_npcx_port_cfg_##inst = { \
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.port = DT_INST_PROP(inst, port), \
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.bitrate = DT_INST_PROP(inst, clock_frequency), \
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.alts_size = ARRAY_SIZE(i2c_port_alts##inst), \
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.alts_list = i2c_port_alts##inst, \
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.i2c_ctrl = DEVICE_DT_GET(DT_INST_PHANDLE(inst, controller)), \
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}; \
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\
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DEVICE_DT_INST_DEFINE(inst, \
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i2c_npcx_port_init, \
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NULL, NULL, \
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&i2c_npcx_port_cfg_##inst, \
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PRE_KERNEL_1, CONFIG_KERNEL_INIT_PRIORITY_DEVICE, \
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&i2c_port_npcx_driver_api);
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DT_INST_FOREACH_STATUS_OKAY(NPCX_I2C_PORT_INIT)
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