300 lines
8.6 KiB
C
300 lines
8.6 KiB
C
/*
|
|
* Copyright (c) 2019, Henrik Brix Andersen <henrik@brixandersen.dk>
|
|
*
|
|
* Based on the i2c_mcux_lpi2c.c driver, which is:
|
|
* Copyright (c) 2016 Freescale Semiconductor, Inc.
|
|
* Copyright (c) 2019, NXP
|
|
*
|
|
* SPDX-License-Identifier: Apache-2.0
|
|
*/
|
|
|
|
#define DT_DRV_COMPAT openisa_rv32m1_lpi2c
|
|
|
|
#include <drivers/i2c.h>
|
|
#include <drivers/clock_control.h>
|
|
#include <fsl_lpi2c.h>
|
|
#include <logging/log.h>
|
|
LOG_MODULE_REGISTER(rv32m1_lpi2c);
|
|
|
|
#include "i2c-priv.h"
|
|
|
|
struct rv32m1_lpi2c_config {
|
|
LPI2C_Type *base;
|
|
char *clock_controller;
|
|
clock_control_subsys_t clock_subsys;
|
|
clock_ip_name_t clock_ip_name;
|
|
uint32_t clock_ip_src;
|
|
uint32_t bitrate;
|
|
void (*irq_config_func)(const struct device *dev);
|
|
};
|
|
|
|
struct rv32m1_lpi2c_data {
|
|
lpi2c_master_handle_t handle;
|
|
struct k_sem transfer_sync;
|
|
struct k_sem completion_sync;
|
|
status_t completion_status;
|
|
};
|
|
|
|
static int rv32m1_lpi2c_configure(const struct device *dev,
|
|
uint32_t dev_config)
|
|
{
|
|
const struct rv32m1_lpi2c_config *config = dev->config;
|
|
const struct device *clk;
|
|
uint32_t baudrate;
|
|
uint32_t clk_freq;
|
|
int err;
|
|
|
|
if (!(I2C_MODE_MASTER & dev_config)) {
|
|
/* Slave mode not supported - yet */
|
|
LOG_ERR("Slave mode not supported");
|
|
return -ENOTSUP;
|
|
}
|
|
|
|
if (I2C_ADDR_10_BITS & dev_config) {
|
|
/* FSL LPI2C driver only supports 7-bit addressing */
|
|
LOG_ERR("10 bit addressing not supported");
|
|
return -ENOTSUP;
|
|
}
|
|
|
|
switch (I2C_SPEED_GET(dev_config)) {
|
|
case I2C_SPEED_STANDARD:
|
|
baudrate = KHZ(100);
|
|
break;
|
|
case I2C_SPEED_FAST:
|
|
baudrate = KHZ(400);
|
|
break;
|
|
case I2C_SPEED_FAST_PLUS:
|
|
baudrate = MHZ(1);
|
|
break;
|
|
/* TODO: only if SCL pin implements current source pull-up */
|
|
/* case I2C_SPEED_HIGH: */
|
|
/* baudrate = KHZ(3400); */
|
|
/* break; */
|
|
/* TODO: ultra-fast requires pin_config setting */
|
|
/* case I2C_SPEED_ULTRA: */
|
|
/* baudrate = MHZ(5); */
|
|
/* break; */
|
|
default:
|
|
LOG_ERR("Unsupported speed");
|
|
return -ENOTSUP;
|
|
}
|
|
|
|
clk = device_get_binding(config->clock_controller);
|
|
if (!clk) {
|
|
LOG_ERR("Could not get clock controller '%s'",
|
|
config->clock_controller);
|
|
return -EINVAL;
|
|
}
|
|
|
|
err = clock_control_get_rate(clk, config->clock_subsys, &clk_freq);
|
|
if (err) {
|
|
LOG_ERR("Could not get clock frequency (err %d)", err);
|
|
return -EINVAL;
|
|
}
|
|
|
|
LPI2C_MasterSetBaudRate(config->base, clk_freq, baudrate);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void rv32m1_lpi2c_master_transfer_callback(LPI2C_Type *base,
|
|
lpi2c_master_handle_t *handle,
|
|
status_t completionStatus,
|
|
void *userData)
|
|
{
|
|
struct rv32m1_lpi2c_data *data = userData;
|
|
|
|
ARG_UNUSED(base);
|
|
ARG_UNUSED(handle);
|
|
|
|
data->completion_status = completionStatus;
|
|
k_sem_give(&data->completion_sync);
|
|
}
|
|
|
|
static uint32_t rv32m1_lpi2c_convert_flags(int msg_flags)
|
|
{
|
|
uint32_t flags = 0U;
|
|
|
|
if (!(msg_flags & I2C_MSG_STOP)) {
|
|
flags |= kLPI2C_TransferNoStopFlag;
|
|
}
|
|
|
|
if (msg_flags & I2C_MSG_RESTART) {
|
|
flags |= kLPI2C_TransferRepeatedStartFlag;
|
|
}
|
|
|
|
return flags;
|
|
}
|
|
|
|
static int rv32m1_lpi2c_transfer(const struct device *dev,
|
|
struct i2c_msg *msgs,
|
|
uint8_t num_msgs, uint16_t addr)
|
|
{
|
|
const struct rv32m1_lpi2c_config *config = dev->config;
|
|
struct rv32m1_lpi2c_data *data = dev->data;
|
|
lpi2c_master_transfer_t transfer;
|
|
status_t status;
|
|
int ret = 0;
|
|
|
|
k_sem_take(&data->transfer_sync, K_FOREVER);
|
|
|
|
/* Iterate over all the messages */
|
|
for (int i = 0; i < num_msgs; i++) {
|
|
if (I2C_MSG_ADDR_10_BITS & msgs->flags) {
|
|
ret = -ENOTSUP;
|
|
goto out;
|
|
}
|
|
|
|
/* Initialize the transfer descriptor */
|
|
transfer.flags = rv32m1_lpi2c_convert_flags(msgs->flags);
|
|
|
|
/* Prevent the controller to send a start condition between
|
|
* messages, except if explicitly requested.
|
|
*/
|
|
if (i != 0 && !(msgs->flags & I2C_MSG_RESTART)) {
|
|
transfer.flags |= kLPI2C_TransferNoStartFlag;
|
|
}
|
|
|
|
transfer.slaveAddress = addr;
|
|
transfer.direction = (msgs->flags & I2C_MSG_READ)
|
|
? kLPI2C_Read : kLPI2C_Write;
|
|
transfer.subaddress = 0;
|
|
transfer.subaddressSize = 0;
|
|
transfer.data = msgs->buf;
|
|
transfer.dataSize = msgs->len;
|
|
|
|
/* Start the transfer */
|
|
status = LPI2C_MasterTransferNonBlocking(config->base,
|
|
&data->handle,
|
|
&transfer);
|
|
|
|
/* Return an error if the transfer didn't start successfully
|
|
* e.g., if the bus was busy
|
|
*/
|
|
if (status != kStatus_Success) {
|
|
LOG_DBG("Could not start transfer (status %d)", status);
|
|
ret = -EIO;
|
|
goto out;
|
|
}
|
|
|
|
/* Wait for the transfer to complete */
|
|
k_sem_take(&data->completion_sync, K_FOREVER);
|
|
|
|
/* Return an error if the transfer didn't complete
|
|
* successfully. e.g., nak, timeout, lost arbitration
|
|
*/
|
|
if (data->completion_status != kStatus_Success) {
|
|
LOG_DBG("Transfer failed (status %d)",
|
|
data->completion_status);
|
|
LPI2C_MasterTransferAbort(config->base, &data->handle);
|
|
ret = -EIO;
|
|
goto out;
|
|
}
|
|
|
|
/* Move to the next message */
|
|
msgs++;
|
|
}
|
|
|
|
out:
|
|
k_sem_give(&data->transfer_sync);
|
|
return ret;
|
|
}
|
|
|
|
static void rv32m1_lpi2c_isr(const struct device *dev)
|
|
{
|
|
const struct rv32m1_lpi2c_config *config = dev->config;
|
|
struct rv32m1_lpi2c_data *data = dev->data;
|
|
|
|
LPI2C_MasterTransferHandleIRQ(config->base, &data->handle);
|
|
}
|
|
|
|
static int rv32m1_lpi2c_init(const struct device *dev)
|
|
{
|
|
const struct rv32m1_lpi2c_config *config = dev->config;
|
|
struct rv32m1_lpi2c_data *data = dev->data;
|
|
lpi2c_master_config_t master_config;
|
|
const struct device *clk;
|
|
uint32_t clk_freq, dev_cfg;
|
|
int err;
|
|
|
|
CLOCK_SetIpSrc(config->clock_ip_name, config->clock_ip_src);
|
|
|
|
clk = device_get_binding(config->clock_controller);
|
|
if (!clk) {
|
|
LOG_ERR("Could not get clock controller '%s'",
|
|
config->clock_controller);
|
|
return -EINVAL;
|
|
}
|
|
|
|
err = clock_control_on(clk, config->clock_subsys);
|
|
if (err) {
|
|
LOG_ERR("Could not turn on clock (err %d)", err);
|
|
return -EINVAL;
|
|
}
|
|
|
|
err = clock_control_get_rate(clk, config->clock_subsys, &clk_freq);
|
|
if (err) {
|
|
LOG_ERR("Could not get clock frequency (err %d)", err);
|
|
return -EINVAL;
|
|
}
|
|
|
|
LPI2C_MasterGetDefaultConfig(&master_config);
|
|
LPI2C_MasterInit(config->base, &master_config, clk_freq);
|
|
LPI2C_MasterTransferCreateHandle(config->base, &data->handle,
|
|
rv32m1_lpi2c_master_transfer_callback,
|
|
data);
|
|
|
|
dev_cfg = i2c_map_dt_bitrate(config->bitrate);
|
|
err = rv32m1_lpi2c_configure(dev, dev_cfg | I2C_MODE_MASTER);
|
|
if (err) {
|
|
LOG_ERR("Could not configure controller (err %d)", err);
|
|
return err;
|
|
}
|
|
|
|
config->irq_config_func(dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct i2c_driver_api rv32m1_lpi2c_driver_api = {
|
|
.configure = rv32m1_lpi2c_configure,
|
|
.transfer = rv32m1_lpi2c_transfer,
|
|
};
|
|
|
|
#define RV32M1_LPI2C_DEVICE(id) \
|
|
static void rv32m1_lpi2c_irq_config_func_##id(const struct device *dev); \
|
|
static const struct rv32m1_lpi2c_config rv32m1_lpi2c_##id##_config = { \
|
|
.base = \
|
|
(LPI2C_Type *)DT_INST_REG_ADDR(id), \
|
|
.clock_controller = DT_INST_CLOCKS_LABEL(id), \
|
|
.clock_subsys = \
|
|
(clock_control_subsys_t) DT_INST_CLOCKS_CELL(id, name),\
|
|
.clock_ip_name = INST_DT_CLOCK_IP_NAME(id), \
|
|
.clock_ip_src = kCLOCK_IpSrcFircAsync, \
|
|
.bitrate = DT_INST_PROP(id, clock_frequency), \
|
|
.irq_config_func = rv32m1_lpi2c_irq_config_func_##id, \
|
|
}; \
|
|
static struct rv32m1_lpi2c_data rv32m1_lpi2c_##id##_data = { \
|
|
.transfer_sync = Z_SEM_INITIALIZER( \
|
|
rv32m1_lpi2c_##id##_data.transfer_sync, 1, 1), \
|
|
.completion_sync = Z_SEM_INITIALIZER( \
|
|
rv32m1_lpi2c_##id##_data.completion_sync, 0, 1), \
|
|
}; \
|
|
DEVICE_AND_API_INIT(rv32m1_lpi2c_##id, \
|
|
DT_INST_LABEL(id), \
|
|
&rv32m1_lpi2c_init, \
|
|
&rv32m1_lpi2c_##id##_data, \
|
|
&rv32m1_lpi2c_##id##_config, \
|
|
POST_KERNEL, CONFIG_I2C_INIT_PRIORITY, \
|
|
&rv32m1_lpi2c_driver_api); \
|
|
static void rv32m1_lpi2c_irq_config_func_##id(const struct device *dev) \
|
|
{ \
|
|
IRQ_CONNECT(DT_INST_IRQN(id), \
|
|
0, \
|
|
rv32m1_lpi2c_isr, DEVICE_GET(rv32m1_lpi2c_##id), \
|
|
0); \
|
|
irq_enable(DT_INST_IRQN(id)); \
|
|
} \
|
|
|
|
DT_INST_FOREACH_STATUS_OKAY(RV32M1_LPI2C_DEVICE)
|