| /* |
| * Copyright (c) 2020 Nuvoton Technology Corporation. |
| * |
| * SPDX-License-Identifier: Apache-2.0 |
| */ |
| |
| #define DT_DRV_COMPAT nuvoton_npcx_i2c_port |
| |
| /** |
| * @file |
| * @brief Nuvoton NPCX smb/i2c port driver |
| * |
| * This file contains the driver of SMBus/I2C buses (ports) which provides |
| * pin-muxing for each i2c io-pads. In order to support "SMBus Multi-Bus" |
| * feature, please refer the diagram below, the driver alsp provides connection |
| * between Zephyr i2c api functions and i2c controller driver which provides |
| * full support for SMBus/I2C transactions. |
| * |
| * Port SEL |
| * | |
| * |\| |
| * SCL_N Port 0----| \ +--------------+ |
| * SDA_N Port 0----| |----| SMB/I2C | |
| * | |----| Controller N | |
| * SCL_N Port 1----| | +--------------+ |
| * SDA_N Port 1----| / |
| * |/ |
| * |
| */ |
| |
| #include <assert.h> |
| #include <drivers/clock_control.h> |
| #include <drivers/i2c.h> |
| #include <dt-bindings/i2c/i2c.h> |
| #include <soc.h> |
| |
| #include <logging/log.h> |
| LOG_MODULE_REGISTER(i2c_npcx_port, LOG_LEVEL_ERR); |
| |
| #include "i2c_npcx_controller.h" |
| #include "i2c-priv.h" |
| |
| /* Device config */ |
| struct i2c_npcx_port_config { |
| /* pinmux configuration */ |
| const uint8_t alts_size; |
| const struct npcx_alt *alts_list; |
| uint32_t bitrate; |
| uint8_t port; |
| const struct device *i2c_ctrl; |
| }; |
| |
| /* Driver convenience defines */ |
| #define DRV_CONFIG(dev) \ |
| ((const struct i2c_npcx_port_config *)(dev)->config) |
| |
| /* I2C api functions */ |
| static int i2c_npcx_port_configure(const struct device *dev, |
| uint32_t dev_config) |
| { |
| const struct i2c_npcx_port_config *const config = DRV_CONFIG(dev); |
| |
| if (config->i2c_ctrl == NULL) { |
| LOG_ERR("Cannot find i2c controller on port%02x!", |
| config->port); |
| return -EIO; |
| } |
| |
| if (!(dev_config & I2C_MODE_MASTER)) { |
| return -ENOTSUP; |
| } |
| |
| if (dev_config & I2C_ADDR_10_BITS) { |
| return -ENOTSUP; |
| } |
| |
| /* Configure i2c controller */ |
| return npcx_i2c_ctrl_configure(config->i2c_ctrl, dev_config); |
| } |
| |
| static int i2c_npcx_port_transfer(const struct device *dev, |
| struct i2c_msg *msgs, uint8_t num_msgs, uint16_t addr) |
| { |
| const struct i2c_npcx_port_config *const config = DRV_CONFIG(dev); |
| int ret = 0; |
| int idx_ctrl = (config->port & 0xF0) >> 4; |
| int idx_port = (config->port & 0x0F); |
| |
| if (config->i2c_ctrl == NULL) { |
| LOG_ERR("Cannot find i2c controller on port%02x!", |
| config->port); |
| return -EIO; |
| } |
| |
| /* Lock mutex of i2c/smb controller */ |
| npcx_i2c_ctrl_mutex_lock(config->i2c_ctrl); |
| |
| /* Switch correct port for i2c controller first */ |
| npcx_pinctrl_i2c_port_sel(idx_ctrl, idx_port); |
| |
| /* Start transaction with i2c controller */ |
| ret = npcx_i2c_ctrl_transfer(config->i2c_ctrl, msgs, num_msgs, addr, |
| config->port); |
| |
| /* Unlock mutex of i2c/smb controller */ |
| npcx_i2c_ctrl_mutex_unlock(config->i2c_ctrl); |
| |
| return ret; |
| } |
| |
| /* I2C driver registration */ |
| static int i2c_npcx_port_init(const struct device *dev) |
| { |
| const struct i2c_npcx_port_config *const config = DRV_CONFIG(dev); |
| uint32_t i2c_config; |
| int ret; |
| |
| /* Configure pin-mux for I2C device */ |
| npcx_pinctrl_mux_configure(config->alts_list, config->alts_size, 1); |
| |
| /* Setup initial i2c configuration */ |
| i2c_config = (I2C_MODE_MASTER | i2c_map_dt_bitrate(config->bitrate)); |
| ret = i2c_npcx_port_configure(dev, i2c_config); |
| if (ret != 0) { |
| return ret; |
| } |
| |
| return 0; |
| } |
| |
| static const struct i2c_driver_api i2c_port_npcx_driver_api = { |
| .configure = i2c_npcx_port_configure, |
| .transfer = i2c_npcx_port_transfer, |
| }; |
| |
| /* I2C port init macro functions */ |
| #define NPCX_I2C_PORT_INIT(inst) \ |
| static const struct npcx_alt i2c_port_alts##inst[] = \ |
| NPCX_DT_ALT_ITEMS_LIST(inst); \ |
| \ |
| static const struct i2c_npcx_port_config i2c_npcx_port_cfg_##inst = { \ |
| .port = DT_INST_PROP(inst, port), \ |
| .bitrate = DT_INST_PROP(inst, clock_frequency), \ |
| .alts_size = ARRAY_SIZE(i2c_port_alts##inst), \ |
| .alts_list = i2c_port_alts##inst, \ |
| .i2c_ctrl = DEVICE_DT_GET(DT_INST_PHANDLE(inst, controller)), \ |
| }; \ |
| \ |
| DEVICE_DT_INST_DEFINE(inst, \ |
| i2c_npcx_port_init, \ |
| NULL, NULL, \ |
| &i2c_npcx_port_cfg_##inst, \ |
| PRE_KERNEL_1, CONFIG_KERNEL_INIT_PRIORITY_DEVICE, \ |
| &i2c_port_npcx_driver_api); |
| |
| DT_INST_FOREACH_STATUS_OKAY(NPCX_I2C_PORT_INIT) |