blob: 2a0bd692ea8f72d9d196b53fbd293f4fe6ac1483 [file] [log] [blame]
/*
* Copyright (c) 2016 BayLibre, SAS
* Copyright (c) 2017 Linaro Ltd
*
* SPDX-License-Identifier: Apache-2.0
*
* I2C Driver for: STM32F0, STM32F3, STM32F7, STM32L0, STM32L4 and STM32WB
*
*/
#include <clock_control/stm32_clock_control.h>
#include <drivers/clock_control.h>
#include <sys/util.h>
#include <kernel.h>
#include <soc.h>
#include <errno.h>
#include <drivers/i2c.h>
#include "i2c_ll_stm32.h"
#define LOG_LEVEL CONFIG_I2C_LOG_LEVEL
#include <logging/log.h>
LOG_MODULE_REGISTER(i2c_ll_stm32_v2);
#include "i2c-priv.h"
static inline void msg_init(struct device *dev, struct i2c_msg *msg,
u8_t *next_msg_flags, u16_t slave,
uint32_t transfer)
{
const struct i2c_stm32_config *cfg = DEV_CFG(dev);
struct i2c_stm32_data *data = DEV_DATA(dev);
I2C_TypeDef *i2c = cfg->i2c;
if (LL_I2C_IsEnabledReloadMode(i2c)) {
LL_I2C_SetTransferSize(i2c, msg->len);
} else {
if (I2C_ADDR_10_BITS & data->dev_config) {
LL_I2C_SetMasterAddressingMode(i2c,
LL_I2C_ADDRESSING_MODE_10BIT);
LL_I2C_SetSlaveAddr(i2c, (uint32_t) slave);
} else {
LL_I2C_SetMasterAddressingMode(i2c,
LL_I2C_ADDRESSING_MODE_7BIT);
LL_I2C_SetSlaveAddr(i2c, (uint32_t) slave << 1);
}
if (!(msg->flags & I2C_MSG_STOP) && next_msg_flags &&
!(*next_msg_flags & I2C_MSG_RESTART)) {
LL_I2C_EnableReloadMode(i2c);
} else {
LL_I2C_DisableReloadMode(i2c);
}
LL_I2C_DisableAutoEndMode(i2c);
LL_I2C_SetTransferRequest(i2c, transfer);
LL_I2C_SetTransferSize(i2c, msg->len);
#if defined(CONFIG_I2C_SLAVE)
data->master_active = true;
#endif
LL_I2C_Enable(i2c);
LL_I2C_GenerateStartCondition(i2c);
}
}
#ifdef CONFIG_I2C_STM32_INTERRUPT
static void stm32_i2c_disable_transfer_interrupts(struct device *dev)
{
const struct i2c_stm32_config *cfg = DEV_CFG(dev);
I2C_TypeDef *i2c = cfg->i2c;
LL_I2C_DisableIT_TX(i2c);
LL_I2C_DisableIT_RX(i2c);
LL_I2C_DisableIT_STOP(i2c);
LL_I2C_DisableIT_NACK(i2c);
LL_I2C_DisableIT_TC(i2c);
LL_I2C_DisableIT_ERR(i2c);
}
static void stm32_i2c_enable_transfer_interrupts(struct device *dev)
{
const struct i2c_stm32_config *cfg = DEV_CFG(dev);
I2C_TypeDef *i2c = cfg->i2c;
LL_I2C_EnableIT_STOP(i2c);
LL_I2C_EnableIT_NACK(i2c);
LL_I2C_EnableIT_TC(i2c);
LL_I2C_EnableIT_ERR(i2c);
}
static void stm32_i2c_master_mode_end(struct device *dev)
{
const struct i2c_stm32_config *cfg = DEV_CFG(dev);
struct i2c_stm32_data *data = DEV_DATA(dev);
I2C_TypeDef *i2c = cfg->i2c;
stm32_i2c_disable_transfer_interrupts(dev);
#if defined(CONFIG_I2C_SLAVE)
data->master_active = false;
if (!data->slave_attached) {
LL_I2C_Disable(i2c);
}
#else
LL_I2C_Disable(i2c);
#endif
k_sem_give(&data->device_sync_sem);
}
#if defined(CONFIG_I2C_SLAVE)
static void stm32_i2c_slave_event(struct device *dev)
{
const struct i2c_stm32_config *cfg = DEV_CFG(dev);
struct i2c_stm32_data *data = DEV_DATA(dev);
I2C_TypeDef *i2c = cfg->i2c;
const struct i2c_slave_callbacks *slave_cb =
data->slave_cfg->callbacks;
if (LL_I2C_IsActiveFlag_TXIS(i2c)) {
u8_t val;
slave_cb->read_processed(data->slave_cfg, &val);
LL_I2C_TransmitData8(i2c, val);
return;
}
if (LL_I2C_IsActiveFlag_RXNE(i2c)) {
u8_t val = LL_I2C_ReceiveData8(i2c);
if (slave_cb->write_received(data->slave_cfg, val)) {
LL_I2C_AcknowledgeNextData(i2c, LL_I2C_NACK);
}
return;
}
if (LL_I2C_IsActiveFlag_NACK(i2c)) {
LL_I2C_ClearFlag_NACK(i2c);
}
if (LL_I2C_IsActiveFlag_STOP(i2c)) {
stm32_i2c_disable_transfer_interrupts(dev);
/* Flush remaining TX byte before clearing Stop Flag */
LL_I2C_ClearFlag_TXE(i2c);
LL_I2C_ClearFlag_STOP(i2c);
slave_cb->stop(data->slave_cfg);
/* Prepare to ACK next transmissions address byte */
LL_I2C_AcknowledgeNextData(i2c, LL_I2C_ACK);
}
if (LL_I2C_IsActiveFlag_ADDR(i2c)) {
u32_t dir;
LL_I2C_ClearFlag_ADDR(i2c);
dir = LL_I2C_GetTransferDirection(i2c);
if (dir == LL_I2C_DIRECTION_WRITE) {
slave_cb->write_requested(data->slave_cfg);
LL_I2C_EnableIT_RX(i2c);
} else {
u8_t val;
slave_cb->read_requested(data->slave_cfg, &val);
LL_I2C_TransmitData8(i2c, val);
LL_I2C_EnableIT_TX(i2c);
}
stm32_i2c_enable_transfer_interrupts(dev);
}
}
/* Attach and start I2C as slave */
int i2c_stm32_slave_register(struct device *dev,
struct i2c_slave_config *config)
{
const struct i2c_stm32_config *cfg = DEV_CFG(dev);
struct i2c_stm32_data *data = DEV_DATA(dev);
I2C_TypeDef *i2c = cfg->i2c;
u32_t bitrate_cfg;
int ret;
if (!config) {
return -EINVAL;
}
if (data->slave_attached) {
return -EBUSY;
}
if (data->master_active) {
return -EBUSY;
}
bitrate_cfg = i2c_map_dt_bitrate(cfg->bitrate);
ret = i2c_stm32_runtime_configure(dev, bitrate_cfg);
if (ret < 0) {
LOG_ERR("i2c: failure initializing");
return ret;
}
data->slave_cfg = config;
LL_I2C_Enable(i2c);
LL_I2C_SetOwnAddress1(i2c, config->address << 1,
LL_I2C_OWNADDRESS1_7BIT);
LL_I2C_EnableOwnAddress1(i2c);
data->slave_attached = true;
LOG_DBG("i2c: slave registered");
LL_I2C_EnableIT_ADDR(i2c);
return 0;
}
int i2c_stm32_slave_unregister(struct device *dev,
struct i2c_slave_config *config)
{
const struct i2c_stm32_config *cfg = DEV_CFG(dev);
struct i2c_stm32_data *data = DEV_DATA(dev);
I2C_TypeDef *i2c = cfg->i2c;
if (!data->slave_attached) {
return -EINVAL;
}
if (data->master_active) {
return -EBUSY;
}
LL_I2C_DisableOwnAddress1(i2c);
LL_I2C_DisableIT_ADDR(i2c);
stm32_i2c_disable_transfer_interrupts(dev);
LL_I2C_ClearFlag_NACK(i2c);
LL_I2C_ClearFlag_STOP(i2c);
LL_I2C_ClearFlag_ADDR(i2c);
LL_I2C_Disable(i2c);
data->slave_attached = false;
LOG_DBG("i2c: slave unregistered");
return 0;
}
#endif /* defined(CONFIG_I2C_SLAVE) */
static void stm32_i2c_event(struct device *dev)
{
const struct i2c_stm32_config *cfg = DEV_CFG(dev);
struct i2c_stm32_data *data = DEV_DATA(dev);
I2C_TypeDef *i2c = cfg->i2c;
#if defined(CONFIG_I2C_SLAVE)
if (data->slave_attached && !data->master_active) {
stm32_i2c_slave_event(dev);
return;
}
#endif
if (data->current.len) {
/* Send next byte */
if (LL_I2C_IsActiveFlag_TXIS(i2c)) {
LL_I2C_TransmitData8(i2c, *data->current.buf);
}
/* Receive next byte */
if (LL_I2C_IsActiveFlag_RXNE(i2c)) {
*data->current.buf = LL_I2C_ReceiveData8(i2c);
}
data->current.buf++;
data->current.len--;
}
/* NACK received */
if (LL_I2C_IsActiveFlag_NACK(i2c)) {
LL_I2C_ClearFlag_NACK(i2c);
data->current.is_nack = 1U;
goto end;
}
/* STOP received */
if (LL_I2C_IsActiveFlag_STOP(i2c)) {
LL_I2C_ClearFlag_STOP(i2c);
LL_I2C_DisableReloadMode(i2c);
goto end;
}
/* Transfer Complete or Transfer Complete Reload */
if (LL_I2C_IsActiveFlag_TC(i2c) ||
LL_I2C_IsActiveFlag_TCR(i2c)) {
/* Issue stop condition if necessary */
if (data->current.msg->flags & I2C_MSG_STOP) {
LL_I2C_GenerateStopCondition(i2c);
} else {
stm32_i2c_disable_transfer_interrupts(dev);
k_sem_give(&data->device_sync_sem);
}
}
return;
end:
stm32_i2c_master_mode_end(dev);
}
static int stm32_i2c_error(struct device *dev)
{
const struct i2c_stm32_config *cfg = DEV_CFG(dev);
struct i2c_stm32_data *data = DEV_DATA(dev);
I2C_TypeDef *i2c = cfg->i2c;
#if defined(CONFIG_I2C_SLAVE)
if (data->slave_attached && !data->master_active) {
/* No need for a slave error function right now. */
return 0;
}
#endif
if (LL_I2C_IsActiveFlag_ARLO(i2c)) {
LL_I2C_ClearFlag_ARLO(i2c);
data->current.is_arlo = 1U;
goto end;
}
if (LL_I2C_IsActiveFlag_BERR(i2c)) {
LL_I2C_ClearFlag_BERR(i2c);
data->current.is_err = 1U;
goto end;
}
return 0;
end:
stm32_i2c_master_mode_end(dev);
return -EIO;
}
#ifdef CONFIG_I2C_STM32_COMBINED_INTERRUPT
void stm32_i2c_combined_isr(void *arg)
{
struct device *dev = (struct device *) arg;
if (stm32_i2c_error(dev)) {
return;
}
stm32_i2c_event(dev);
}
#else
void stm32_i2c_event_isr(void *arg)
{
struct device *dev = (struct device *) arg;
stm32_i2c_event(dev);
}
void stm32_i2c_error_isr(void *arg)
{
struct device *dev = (struct device *) arg;
stm32_i2c_error(dev);
}
#endif
int stm32_i2c_msg_write(struct device *dev, struct i2c_msg *msg,
u8_t *next_msg_flags, uint16_t slave)
{
const struct i2c_stm32_config *cfg = DEV_CFG(dev);
struct i2c_stm32_data *data = DEV_DATA(dev);
I2C_TypeDef *i2c = cfg->i2c;
data->current.len = msg->len;
data->current.buf = msg->buf;
data->current.is_write = 1U;
data->current.is_nack = 0U;
data->current.is_err = 0U;
data->current.msg = msg;
msg_init(dev, msg, next_msg_flags, slave, LL_I2C_REQUEST_WRITE);
stm32_i2c_enable_transfer_interrupts(dev);
LL_I2C_EnableIT_TX(i2c);
k_sem_take(&data->device_sync_sem, K_FOREVER);
if (data->current.is_nack || data->current.is_err ||
data->current.is_arlo) {
goto error;
}
return 0;
error:
if (data->current.is_arlo) {
LOG_DBG("%s: ARLO %d", __func__,
data->current.is_arlo);
data->current.is_arlo = 0U;
}
if (data->current.is_nack) {
LOG_DBG("%s: NACK", __func__);
data->current.is_nack = 0U;
}
if (data->current.is_err) {
LOG_DBG("%s: ERR %d", __func__,
data->current.is_err);
data->current.is_err = 0U;
}
return -EIO;
}
int stm32_i2c_msg_read(struct device *dev, struct i2c_msg *msg,
u8_t *next_msg_flags, uint16_t slave)
{
const struct i2c_stm32_config *cfg = DEV_CFG(dev);
struct i2c_stm32_data *data = DEV_DATA(dev);
I2C_TypeDef *i2c = cfg->i2c;
data->current.len = msg->len;
data->current.buf = msg->buf;
data->current.is_write = 0U;
data->current.is_arlo = 0U;
data->current.is_err = 0U;
data->current.is_nack = 0U;
data->current.msg = msg;
msg_init(dev, msg, next_msg_flags, slave, LL_I2C_REQUEST_READ);
stm32_i2c_enable_transfer_interrupts(dev);
LL_I2C_EnableIT_RX(i2c);
k_sem_take(&data->device_sync_sem, K_FOREVER);
if (data->current.is_nack || data->current.is_err ||
data->current.is_arlo) {
goto error;
}
return 0;
error:
if (data->current.is_arlo) {
LOG_DBG("%s: ARLO %d", __func__,
data->current.is_arlo);
data->current.is_arlo = 0U;
}
if (data->current.is_nack) {
LOG_DBG("%s: NACK", __func__);
data->current.is_nack = 0U;
}
if (data->current.is_err) {
LOG_DBG("%s: ERR %d", __func__,
data->current.is_err);
data->current.is_err = 0U;
}
return -EIO;
}
#else /* !CONFIG_I2C_STM32_INTERRUPT */
static inline int check_errors(struct device *dev, const char *funcname)
{
const struct i2c_stm32_config *cfg = DEV_CFG(dev);
I2C_TypeDef *i2c = cfg->i2c;
if (LL_I2C_IsActiveFlag_NACK(i2c)) {
LL_I2C_ClearFlag_NACK(i2c);
LOG_DBG("%s: NACK", funcname);
goto error;
}
if (LL_I2C_IsActiveFlag_ARLO(i2c)) {
LL_I2C_ClearFlag_ARLO(i2c);
LOG_DBG("%s: ARLO", funcname);
goto error;
}
if (LL_I2C_IsActiveFlag_OVR(i2c)) {
LL_I2C_ClearFlag_OVR(i2c);
LOG_DBG("%s: OVR", funcname);
goto error;
}
if (LL_I2C_IsActiveFlag_BERR(i2c)) {
LL_I2C_ClearFlag_BERR(i2c);
LOG_DBG("%s: BERR", funcname);
goto error;
}
return 0;
error:
if (LL_I2C_IsEnabledReloadMode(i2c)) {
LL_I2C_DisableReloadMode(i2c);
}
return -EIO;
}
static inline int msg_done(struct device *dev, unsigned int current_msg_flags)
{
const struct i2c_stm32_config *cfg = DEV_CFG(dev);
I2C_TypeDef *i2c = cfg->i2c;
/* Wait for transfer to complete */
while (!LL_I2C_IsActiveFlag_TC(i2c) && !LL_I2C_IsActiveFlag_TCR(i2c)) {
if (check_errors(dev, __func__)) {
return -EIO;
}
}
/* Issue stop condition if necessary */
if (current_msg_flags & I2C_MSG_STOP) {
LL_I2C_GenerateStopCondition(i2c);
while (!LL_I2C_IsActiveFlag_STOP(i2c)) {
}
LL_I2C_ClearFlag_STOP(i2c);
LL_I2C_DisableReloadMode(i2c);
}
return 0;
}
int stm32_i2c_msg_write(struct device *dev, struct i2c_msg *msg,
u8_t *next_msg_flags, uint16_t slave)
{
const struct i2c_stm32_config *cfg = DEV_CFG(dev);
I2C_TypeDef *i2c = cfg->i2c;
unsigned int len = 0U;
u8_t *buf = msg->buf;
msg_init(dev, msg, next_msg_flags, slave, LL_I2C_REQUEST_WRITE);
len = msg->len;
while (len) {
while (1) {
if (LL_I2C_IsActiveFlag_TXIS(i2c)) {
break;
}
if (check_errors(dev, __func__)) {
return -EIO;
}
}
LL_I2C_TransmitData8(i2c, *buf);
buf++;
len--;
}
return msg_done(dev, msg->flags);
}
int stm32_i2c_msg_read(struct device *dev, struct i2c_msg *msg,
u8_t *next_msg_flags, uint16_t slave)
{
const struct i2c_stm32_config *cfg = DEV_CFG(dev);
I2C_TypeDef *i2c = cfg->i2c;
unsigned int len = 0U;
u8_t *buf = msg->buf;
msg_init(dev, msg, next_msg_flags, slave, LL_I2C_REQUEST_READ);
len = msg->len;
while (len) {
while (!LL_I2C_IsActiveFlag_RXNE(i2c)) {
if (check_errors(dev, __func__)) {
return -EIO;
}
}
*buf = LL_I2C_ReceiveData8(i2c);
buf++;
len--;
}
return msg_done(dev, msg->flags);
}
#endif
int stm32_i2c_configure_timing(struct device *dev, u32_t clock)
{
const struct i2c_stm32_config *cfg = DEV_CFG(dev);
struct i2c_stm32_data *data = DEV_DATA(dev);
I2C_TypeDef *i2c = cfg->i2c;
u32_t i2c_hold_time_min, i2c_setup_time_min;
u32_t i2c_h_min_time, i2c_l_min_time;
u32_t presc = 1U;
u32_t timing = 0U;
switch (I2C_SPEED_GET(data->dev_config)) {
case I2C_SPEED_STANDARD:
i2c_h_min_time = 4000U;
i2c_l_min_time = 4700U;
i2c_hold_time_min = 500U;
i2c_setup_time_min = 1250U;
break;
case I2C_SPEED_FAST:
i2c_h_min_time = 600U;
i2c_l_min_time = 1300U;
i2c_hold_time_min = 375U;
i2c_setup_time_min = 500U;
break;
default:
return -EINVAL;
}
/* Calculate period until prescaler matches */
do {
u32_t t_presc = clock / presc;
u32_t ns_presc = NSEC_PER_SEC / t_presc;
u32_t sclh = i2c_h_min_time / ns_presc;
u32_t scll = i2c_l_min_time / ns_presc;
u32_t sdadel = i2c_hold_time_min / ns_presc;
u32_t scldel = i2c_setup_time_min / ns_presc;
if ((sclh - 1) > 255 || (scll - 1) > 255) {
++presc;
continue;
}
if (sdadel > 15 || (scldel - 1) > 15) {
++presc;
continue;
}
timing = __LL_I2C_CONVERT_TIMINGS(presc - 1,
scldel - 1, sdadel, sclh - 1, scll - 1);
break;
} while (presc < 16);
if (presc >= 16U) {
LOG_DBG("I2C:failed to find prescaler value");
return -EINVAL;
}
LL_I2C_SetTiming(i2c, timing);
return 0;
}