186 lines
5.7 KiB
C
186 lines
5.7 KiB
C
/*
|
|
* 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;
|
|
};
|
|
|
|
/* Driver data */
|
|
struct i2c_npcx_port_data {
|
|
const struct device *i2c_ctrl;
|
|
};
|
|
|
|
/* Driver convenience defines */
|
|
#define DRV_CONFIG(dev) \
|
|
((const struct i2c_npcx_port_config *)(dev)->config)
|
|
|
|
#define DRV_DATA(dev) \
|
|
((struct i2c_npcx_port_data *)(dev)->data)
|
|
|
|
/* 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);
|
|
struct i2c_npcx_port_data *const data = DRV_DATA(dev);
|
|
|
|
if (data->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(data->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);
|
|
struct i2c_npcx_port_data *const data = DRV_DATA(dev);
|
|
int ret = 0;
|
|
int idx_ctrl = (config->port & 0xF0) >> 4;
|
|
int idx_port = (config->port & 0x0F);
|
|
|
|
if (data->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(data->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(data->i2c_ctrl, msgs, num_msgs, addr,
|
|
config->port);
|
|
|
|
/* Unlock mutex of i2c/smb controller */
|
|
npcx_i2c_ctrl_mutex_unlock(data->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_FUNC(inst) _CONCAT(i2c_npcx_port_init_, inst)
|
|
#define NPCX_I2C_PORT_INIT_FUNC_DECL(inst) \
|
|
static int i2c_npcx_port_init_##inst(const struct device *dev)
|
|
|
|
#define NPCX_I2C_PORT_INIT_FUNC_IMPL(inst) \
|
|
static int i2c_npcx_port_init_##inst(const struct device *dev) \
|
|
{ \
|
|
struct i2c_npcx_port_data *const data = DRV_DATA(dev); \
|
|
\
|
|
data->i2c_ctrl = device_get_binding( \
|
|
DT_LABEL(DT_INST_PHANDLE(inst, controller))); \
|
|
return i2c_npcx_port_init(dev); \
|
|
}
|
|
|
|
#define NPCX_I2C_PORT_INIT(inst) \
|
|
NPCX_I2C_PORT_INIT_FUNC_DECL(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, \
|
|
}; \
|
|
\
|
|
static struct i2c_npcx_port_data i2c_npcx_port_data_##inst; \
|
|
\
|
|
DEVICE_DT_INST_DEFINE(inst, \
|
|
NPCX_I2C_PORT_INIT_FUNC(inst), \
|
|
device_pm_control_nop, \
|
|
&i2c_npcx_port_data_##inst, \
|
|
&i2c_npcx_port_cfg_##inst, \
|
|
PRE_KERNEL_1, CONFIG_KERNEL_INIT_PRIORITY_DEVICE, \
|
|
&i2c_port_npcx_driver_api); \
|
|
\
|
|
NPCX_I2C_PORT_INIT_FUNC_IMPL(inst)
|
|
|
|
DT_INST_FOREACH_STATUS_OKAY(NPCX_I2C_PORT_INIT)
|