blob: e1a5b432916972da7063ad33aa671611bfc18b1f [file] [log] [blame] [edit]
/*
* Copyright (c) 2019 Derek Hageman <hageman@inthat.cloud>
*
* SPDX-License-Identifier: Apache-2.0
*/
#define DT_DRV_COMPAT atmel_sam0_i2c
#include <errno.h>
#include <zephyr/device.h>
#include <zephyr/init.h>
#include <soc.h>
#include <zephyr/drivers/i2c.h>
#include <zephyr/drivers/dma.h>
#include <zephyr/drivers/pinctrl.h>
#include <zephyr/logging/log.h>
#include <zephyr/irq.h>
LOG_MODULE_REGISTER(i2c_sam0, CONFIG_I2C_LOG_LEVEL);
#include "i2c-priv.h"
#ifndef SERCOM_I2CM_CTRLA_MODE_I2C_MASTER
#define SERCOM_I2CM_CTRLA_MODE_I2C_MASTER SERCOM_I2CM_CTRLA_MODE(5)
#endif
struct i2c_sam0_dev_config {
SercomI2cm *regs;
const struct pinctrl_dev_config *pcfg;
uint32_t bitrate;
#ifdef MCLK
volatile uint32_t *mclk;
uint32_t mclk_mask;
uint16_t gclk_core_id;
#else
uint32_t pm_apbcmask;
uint16_t gclk_clkctrl_id;
#endif
void (*irq_config_func)(const struct device *dev);
#ifdef CONFIG_I2C_SAM0_DMA_DRIVEN
const struct device *dma_dev;
uint8_t write_dma_request;
uint8_t read_dma_request;
uint8_t dma_channel;
#endif
};
struct i2c_sam0_msg {
uint8_t *buffer;
uint32_t size;
uint32_t status;
};
struct i2c_sam0_dev_data {
struct k_sem lock;
struct k_sem sem;
struct i2c_sam0_msg msg;
struct i2c_msg *msgs;
uint8_t num_msgs;
};
static void wait_synchronization(SercomI2cm *regs)
{
#if defined(SERCOM_I2CM_SYNCBUSY_MASK)
/* SYNCBUSY is a register */
while ((regs->SYNCBUSY.reg & SERCOM_I2CM_SYNCBUSY_MASK) != 0) {
}
#elif defined(SERCOM_I2CM_STATUS_SYNCBUSY)
/* SYNCBUSY is a bit */
while ((regs->STATUS.reg & SERCOM_I2CM_STATUS_SYNCBUSY) != 0) {
}
#else
#error Unsupported device
#endif
}
static bool i2c_sam0_terminate_on_error(const struct device *dev)
{
struct i2c_sam0_dev_data *data = dev->data;
const struct i2c_sam0_dev_config *const cfg = dev->config;
SercomI2cm *i2c = cfg->regs;
if (!(i2c->STATUS.reg & (SERCOM_I2CM_STATUS_ARBLOST |
SERCOM_I2CM_STATUS_RXNACK |
#ifdef SERCOM_I2CM_STATUS_LENERR
SERCOM_I2CM_STATUS_LENERR |
#endif
#ifdef SERCOM_I2CM_STATUS_SEXTTOUT
SERCOM_I2CM_STATUS_SEXTTOUT |
#endif
#ifdef SERCOM_I2CM_STATUS_MEXTTOUT
SERCOM_I2CM_STATUS_MEXTTOUT |
#endif
SERCOM_I2CM_STATUS_LOWTOUT |
SERCOM_I2CM_STATUS_BUSERR))) {
return false;
}
#ifdef CONFIG_I2C_SAM0_DMA_DRIVEN
if (cfg->dma_channel != 0xFF) {
dma_stop(cfg->dma_dev, cfg->dma_channel);
}
#endif
data->msg.status = i2c->STATUS.reg;
/*
* Clear all the flags that require an explicit clear
* (as opposed to being cleared by ADDR writes, etc)
*/
i2c->STATUS.reg = SERCOM_I2CM_STATUS_ARBLOST |
#ifdef SERCOM_I2CM_STATUS_LENERR
SERCOM_I2CM_STATUS_LENERR |
#endif
SERCOM_I2CM_STATUS_LOWTOUT |
SERCOM_I2CM_STATUS_BUSERR;
wait_synchronization(i2c);
i2c->INTENCLR.reg = SERCOM_I2CM_INTENCLR_MASK;
if (i2c->INTFLAG.reg & (SERCOM_I2CM_INTFLAG_MB | SERCOM_I2CM_INTFLAG_SB)) {
i2c->CTRLB.bit.CMD = 3;
}
k_sem_give(&data->sem);
return true;
}
static void i2c_sam0_isr(const struct device *dev)
{
struct i2c_sam0_dev_data *data = dev->data;
const struct i2c_sam0_dev_config *const cfg = dev->config;
SercomI2cm *i2c = cfg->regs;
/* Get present interrupts and clear them */
uint32_t status = i2c->INTFLAG.reg;
i2c->INTFLAG.reg = status;
if (i2c_sam0_terminate_on_error(dev)) {
return;
}
/*
* Directly send/receive next message if it is in the same direction and
* the current message has no stop flag and the next message has no
* restart flag.
*/
const bool continue_next = (data->msg.size == 1) && (data->num_msgs > 1) &&
((data->msgs[0].flags & I2C_MSG_RW_MASK) ==
(data->msgs[1].flags & I2C_MSG_RW_MASK)) &&
!(data->msgs[0].flags & I2C_MSG_STOP) &&
!(data->msgs[1].flags & I2C_MSG_RESTART) &&
((status & (SERCOM_I2CM_INTFLAG_MB | SERCOM_I2CM_INTFLAG_SB)));
if (status & SERCOM_I2CM_INTFLAG_MB) {
if (!data->msg.size) {
i2c->INTENCLR.reg = SERCOM_I2CM_INTENCLR_MASK;
/*
* Decide whether to issue a repeated start, or a stop condition...
* - A repeated start can either be accomplished by writing a 0x1
* to the CMD field, or by writing to ADDR - which is what this
* driver does in i2c_sam0_transfer().
* - A stop is accomplished by writing a 0x3 to CMD (below).
*
* This decision is not the same as continue_next, as the value of
* data->msg.size is already zero (not one), and i2c_sam0_transfer()
* is responsible for advancing to the next message, not the ISR.
*/
if ((data->num_msgs <= 1)
|| (data->msgs[0].flags & I2C_MSG_STOP)
|| !(data->msgs[1].flags & I2C_MSG_RESTART)) {
i2c->CTRLB.bit.CMD = 3;
}
k_sem_give(&data->sem);
return;
}
i2c->DATA.reg = *data->msg.buffer;
data->msg.buffer++;
data->msg.size--;
} else if (status & SERCOM_I2CM_INTFLAG_SB) {
if (!continue_next && (data->msg.size == 1)) {
/*
* If this is the last byte, then prepare for an auto
* NACK before doing the actual read. This does not
* require write synchronization.
*/
i2c->CTRLB.bit.ACKACT = 1;
i2c->CTRLB.bit.CMD = 3;
}
*data->msg.buffer = i2c->DATA.reg;
data->msg.buffer++;
data->msg.size--;
if (!continue_next && !data->msg.size) {
i2c->INTENCLR.reg = SERCOM_I2CM_INTENCLR_MASK;
k_sem_give(&data->sem);
return;
}
}
if (continue_next) {
data->msgs++;
data->num_msgs--;
data->msg.buffer = data->msgs->buf;
data->msg.size = data->msgs->len;
data->msg.status = 0;
}
}
#ifdef CONFIG_I2C_SAM0_DMA_DRIVEN
static void i2c_sam0_dma_write_done(const struct device *dma_dev, void *arg,
uint32_t id, int error_code)
{
const struct device *dev = arg;
struct i2c_sam0_dev_data *data = dev->data;
const struct i2c_sam0_dev_config *const cfg = dev->config;
SercomI2cm *i2c = cfg->regs;
ARG_UNUSED(dma_dev);
ARG_UNUSED(id);
unsigned int key = irq_lock();
if (i2c_sam0_terminate_on_error(dev)) {
irq_unlock(key);
return;
}
if (error_code < 0) {
LOG_ERR("DMA write error on %s: %d", dev->name, error_code);
i2c->INTENCLR.reg = SERCOM_I2CM_INTENCLR_MASK;
irq_unlock(key);
data->msg.status = error_code;
k_sem_give(&data->sem);
return;
}
irq_unlock(key);
/*
* DMA has written the whole message now, so just wait for the
* final I2C IRQ to indicate that it's finished transmitting.
*/
data->msg.size = 0;
i2c->INTENSET.reg = SERCOM_I2CM_INTENSET_MB;
}
static bool i2c_sam0_dma_write_start(const struct device *dev)
{
struct i2c_sam0_dev_data *data = dev->data;
const struct i2c_sam0_dev_config *const cfg = dev->config;
SercomI2cm *i2c = cfg->regs;
int retval;
if (cfg->dma_channel == 0xFF) {
return false;
}
if (data->msg.size <= 1) {
/*
* Catch empty writes and skip DMA on single byte transfers.
*/
return false;
}
struct dma_config dma_cfg = { 0 };
struct dma_block_config dma_blk = { 0 };
dma_cfg.channel_direction = MEMORY_TO_PERIPHERAL;
dma_cfg.source_data_size = 1;
dma_cfg.dest_data_size = 1;
dma_cfg.user_data = (void *)dev;
dma_cfg.dma_callback = i2c_sam0_dma_write_done;
dma_cfg.block_count = 1;
dma_cfg.head_block = &dma_blk;
dma_cfg.dma_slot = cfg->write_dma_request;
dma_blk.block_size = data->msg.size;
dma_blk.source_address = (uint32_t)data->msg.buffer;
dma_blk.dest_address = (uint32_t)(&(i2c->DATA.reg));
dma_blk.dest_addr_adj = DMA_ADDR_ADJ_NO_CHANGE;
retval = dma_config(cfg->dma_dev, cfg->dma_channel, &dma_cfg);
if (retval != 0) {
LOG_ERR("Write DMA configure on %s failed: %d",
dev->name, retval);
return false;
}
retval = dma_start(cfg->dma_dev, cfg->dma_channel);
if (retval != 0) {
LOG_ERR("Write DMA start on %s failed: %d",
dev->name, retval);
return false;
}
return true;
}
static void i2c_sam0_dma_read_done(const struct device *dma_dev, void *arg,
uint32_t id, int error_code)
{
const struct device *dev = arg;
struct i2c_sam0_dev_data *data = dev->data;
const struct i2c_sam0_dev_config *const cfg = dev->config;
SercomI2cm *i2c = cfg->regs;
ARG_UNUSED(dma_dev);
ARG_UNUSED(id);
unsigned int key = irq_lock();
if (i2c_sam0_terminate_on_error(dev)) {
irq_unlock(key);
return;
}
if (error_code < 0) {
LOG_ERR("DMA read error on %s: %d", dev->name, error_code);
i2c->INTENCLR.reg = SERCOM_I2CM_INTENCLR_MASK;
irq_unlock(key);
data->msg.status = error_code;
k_sem_give(&data->sem);
return;
}
irq_unlock(key);
/*
* DMA has read all but the last byte now, so let the ISR handle
* that and the terminating NACK.
*/
data->msg.buffer += data->msg.size - 1;
data->msg.size = 1;
i2c->INTENSET.reg = SERCOM_I2CM_INTENSET_SB;
}
static bool i2c_sam0_dma_read_start(const struct device *dev)
{
struct i2c_sam0_dev_data *data = dev->data;
const struct i2c_sam0_dev_config *const cfg = dev->config;
SercomI2cm *i2c = cfg->regs;
int retval;
if (cfg->dma_channel == 0xFF) {
return false;
}
if (data->msg.size <= 2) {
/*
* The last byte is always handled by the I2C ISR so
* just skip a two length read as well.
*/
return false;
}
struct dma_config dma_cfg = { 0 };
struct dma_block_config dma_blk = { 0 };
dma_cfg.channel_direction = PERIPHERAL_TO_MEMORY;
dma_cfg.source_data_size = 1;
dma_cfg.dest_data_size = 1;
dma_cfg.user_data = (void *)dev;
dma_cfg.dma_callback = i2c_sam0_dma_read_done;
dma_cfg.block_count = 1;
dma_cfg.head_block = &dma_blk;
dma_cfg.dma_slot = cfg->read_dma_request;
dma_blk.block_size = data->msg.size - 1;
dma_blk.dest_address = (uint32_t)data->msg.buffer;
dma_blk.source_address = (uint32_t)(&(i2c->DATA.reg));
dma_blk.source_addr_adj = DMA_ADDR_ADJ_NO_CHANGE;
retval = dma_config(cfg->dma_dev, cfg->dma_channel, &dma_cfg);
if (retval != 0) {
LOG_ERR("Read DMA configure on %s failed: %d",
dev->name, retval);
return false;
}
retval = dma_start(cfg->dma_dev, cfg->dma_channel);
if (retval != 0) {
LOG_ERR("Read DMA start on %s failed: %d",
dev->name, retval);
return false;
}
return true;
}
#endif
static int i2c_sam0_transfer(const struct device *dev, struct i2c_msg *msgs,
uint8_t num_msgs, uint16_t addr)
{
struct i2c_sam0_dev_data *data = dev->data;
const struct i2c_sam0_dev_config *const cfg = dev->config;
SercomI2cm *i2c = cfg->regs;
uint32_t addr_reg;
int ret;
if (!num_msgs) {
return 0;
}
k_sem_take(&data->lock, K_FOREVER);
data->num_msgs = num_msgs;
data->msgs = msgs;
for (; data->num_msgs > 0;) {
if (!data->msgs->len) {
if ((data->msgs->flags & I2C_MSG_RW_MASK) == I2C_MSG_READ) {
ret = -EINVAL;
goto unlock;
}
}
i2c->INTENCLR.reg = SERCOM_I2CM_INTENCLR_MASK;
i2c->INTFLAG.reg = SERCOM_I2CM_INTFLAG_MASK;
i2c->STATUS.reg = SERCOM_I2CM_STATUS_ARBLOST |
#ifdef SERCOM_I2CM_STATUS_LENERR
SERCOM_I2CM_STATUS_LENERR |
#endif
SERCOM_I2CM_STATUS_LOWTOUT |
SERCOM_I2CM_STATUS_BUSERR;
wait_synchronization(i2c);
data->msg.buffer = data->msgs->buf;
data->msg.size = data->msgs->len;
data->msg.status = 0;
addr_reg = addr << 1U;
if ((data->msgs->flags & I2C_MSG_RW_MASK) == I2C_MSG_READ) {
addr_reg |= 1U;
/* Set to auto ACK */
i2c->CTRLB.bit.ACKACT = 0;
wait_synchronization(i2c);
}
if (data->msgs->flags & I2C_MSG_ADDR_10_BITS) {
#ifdef SERCOM_I2CM_ADDR_TENBITEN
addr_reg |= SERCOM_I2CM_ADDR_TENBITEN;
#else
ret = -ENOTSUP;
goto unlock;
#endif
}
unsigned int key = irq_lock();
/*
* Writing the address starts the transaction, issuing
* a start/repeated start as required.
*/
i2c->ADDR.reg = addr_reg;
/*
* Have to wait here to make sure the address write
* clears any pending requests or errors before DMA or
* ISR tries to handle it.
*/
wait_synchronization(i2c);
#ifdef SERCOM_I2CM_INTENSET_ERROR
i2c->INTENSET.reg = SERCOM_I2CM_INTENSET_ERROR;
#endif
if ((data->msgs->flags & I2C_MSG_RW_MASK) == I2C_MSG_READ) {
/*
* Always set MB even when reading, since that's how
* some errors are indicated.
*/
i2c->INTENSET.reg = SERCOM_I2CM_INTENSET_MB;
#ifdef CONFIG_I2C_SAM0_DMA_DRIVEN
if (!i2c_sam0_dma_read_start(dev))
#endif
{
i2c->INTENSET.reg = SERCOM_I2CM_INTENSET_SB;
}
} else {
#ifdef CONFIG_I2C_SAM0_DMA_DRIVEN
if (!i2c_sam0_dma_write_start(dev))
#endif
{
i2c->INTENSET.reg = SERCOM_I2CM_INTENSET_MB;
}
}
irq_unlock(key);
/* Now wait for the ISR to handle everything */
k_sem_take(&data->sem, K_FOREVER);
if (data->msg.status) {
if (data->msg.status & SERCOM_I2CM_STATUS_ARBLOST) {
LOG_DBG("Arbitration lost on %s",
dev->name);
ret = -EAGAIN;
goto unlock;
}
LOG_ERR("Transaction error on %s: %08X",
dev->name, data->msg.status);
ret = -EIO;
goto unlock;
}
data->num_msgs--;
data->msgs++;
}
ret = 0;
unlock:
k_sem_give(&data->lock);
return ret;
}
static int i2c_sam0_set_apply_bitrate(const struct device *dev,
uint32_t config)
{
const struct i2c_sam0_dev_config *const cfg = dev->config;
SercomI2cm *i2c = cfg->regs;
uint32_t baud;
uint32_t baud_low;
uint32_t baud_high;
uint32_t CTRLA = i2c->CTRLA.reg;
#ifdef SERCOM_I2CM_CTRLA_SPEED_Msk
CTRLA &= ~SERCOM_I2CM_CTRLA_SPEED_Msk;
#endif
CTRLA &= ~SERCOM_I2CM_CTRLA_SDAHOLD_Msk;
switch (I2C_SPEED_GET(config)) {
case I2C_SPEED_STANDARD:
#ifdef SERCOM_I2CM_CTRLA_SPEED
CTRLA |= SERCOM_I2CM_CTRLA_SPEED(0);
#endif
CTRLA |= SERCOM_I2CM_CTRLA_SDAHOLD(0x0);
i2c->CTRLA.reg = CTRLA;
wait_synchronization(i2c);
/* 5 is the nominal 100ns rise time from the app notes */
baud = (SOC_ATMEL_SAM0_GCLK0_FREQ_HZ / 100000U - 5U - 10U) / 2U;
if (baud > 255U || baud < 1U) {
return -ERANGE;
}
LOG_DBG("Setting %s to standard mode with divisor %u",
dev->name, baud);
i2c->BAUD.reg = SERCOM_I2CM_BAUD_BAUD(baud);
break;
case I2C_SPEED_FAST:
CTRLA |= SERCOM_I2CM_CTRLA_SDAHOLD(0x0);
i2c->CTRLA.reg = CTRLA;
wait_synchronization(i2c);
/* 5 is the nominal 100ns rise time from the app notes */
baud = (SOC_ATMEL_SAM0_GCLK0_FREQ_HZ / 400000U - 5U - 10U) / 2U;
if (baud > 255U || baud < 1U) {
return -ERANGE;
}
LOG_DBG("Setting %s to fast mode with divisor %u",
dev->name, baud);
i2c->BAUD.reg = SERCOM_I2CM_BAUD_BAUD(baud);
break;
case I2C_SPEED_FAST_PLUS:
#ifdef SERCOM_I2CM_CTRLA_SPEED
CTRLA |= SERCOM_I2CM_CTRLA_SPEED(1);
#endif
CTRLA |= SERCOM_I2CM_CTRLA_SDAHOLD(0x2);
i2c->CTRLA.reg = CTRLA;
wait_synchronization(i2c);
/* 5 is the nominal 100ns rise time from the app notes */
baud = (SOC_ATMEL_SAM0_GCLK0_FREQ_HZ / 1000000U - 5U - 10U);
/* 2:1 low:high ratio */
baud_high = baud;
baud_high /= 3U;
baud_high = CLAMP(baud_high, 1U, 255U);
baud_low = baud - baud_high;
if (baud_low < 1U && baud_high > 1U) {
--baud_high;
++baud_low;
}
if (baud_low < 1U || baud_low > 255U) {
return -ERANGE;
}
LOG_DBG("Setting %s to fast mode plus with divisors %u/%u",
dev->name, baud_high, baud_low);
i2c->BAUD.reg = SERCOM_I2CM_BAUD_BAUD(baud_high) |
SERCOM_I2CM_BAUD_BAUDLOW(baud_low);
break;
case I2C_SPEED_HIGH:
#ifdef SERCOM_I2CM_CTRLA_SPEED
CTRLA |= SERCOM_I2CM_CTRLA_SPEED(2);
#endif
CTRLA |= SERCOM_I2CM_CTRLA_SDAHOLD(0x2);
i2c->CTRLA.reg = CTRLA;
wait_synchronization(i2c);
baud = (SOC_ATMEL_SAM0_GCLK0_FREQ_HZ / 3400000U) - 2U;
/* 2:1 low:high ratio */
baud_high = baud;
baud_high /= 3U;
baud_high = CLAMP(baud_high, 1U, 255U);
baud_low = baud - baud_high;
if (baud_low < 1U && baud_high > 1U) {
--baud_high;
++baud_low;
}
if (baud_low < 1U || baud_low > 255U) {
return -ERANGE;
}
#ifdef SERCOM_I2CM_BAUD_HSBAUD
LOG_DBG("Setting %s to high speed with divisors %u/%u",
dev->name, baud_high, baud_low);
/*
* 48 is just from the app notes, but the datasheet says
* it's ignored
*/
i2c->BAUD.reg = SERCOM_I2CM_BAUD_HSBAUD(baud_high) |
SERCOM_I2CM_BAUD_HSBAUDLOW(baud_low) |
SERCOM_I2CM_BAUD_BAUD(48) |
SERCOM_I2CM_BAUD_BAUDLOW(48);
#else
return -ENOTSUP;
#endif
break;
default:
return -ENOTSUP;
}
wait_synchronization(i2c);
return 0;
}
static int i2c_sam0_configure(const struct device *dev, uint32_t config)
{
const struct i2c_sam0_dev_config *const cfg = dev->config;
SercomI2cm *i2c = cfg->regs;
int retval;
if (!(config & I2C_MODE_CONTROLLER)) {
return -EINVAL;
}
if (config & I2C_SPEED_MASK) {
i2c->CTRLA.bit.ENABLE = 0;
wait_synchronization(i2c);
retval = i2c_sam0_set_apply_bitrate(dev, config);
i2c->CTRLA.bit.ENABLE = 1;
wait_synchronization(i2c);
if (retval != 0) {
return retval;
}
}
return 0;
}
static int i2c_sam0_initialize(const struct device *dev)
{
struct i2c_sam0_dev_data *data = dev->data;
const struct i2c_sam0_dev_config *const cfg = dev->config;
SercomI2cm *i2c = cfg->regs;
int retval;
#ifdef MCLK
/* Enable the GCLK */
GCLK->PCHCTRL[cfg->gclk_core_id].reg = GCLK_PCHCTRL_GEN_GCLK0 |
GCLK_PCHCTRL_CHEN;
/* Enable SERCOM clock in MCLK */
*cfg->mclk |= cfg->mclk_mask;
#else
/* Enable the GCLK */
GCLK->CLKCTRL.reg = cfg->gclk_clkctrl_id | GCLK_CLKCTRL_GEN_GCLK0 |
GCLK_CLKCTRL_CLKEN;
/* Enable SERCOM clock in PM */
PM->APBCMASK.reg |= cfg->pm_apbcmask;
#endif
/* Disable all I2C interrupts */
i2c->INTENCLR.reg = SERCOM_I2CM_INTENCLR_MASK;
retval = pinctrl_apply_state(cfg->pcfg, PINCTRL_STATE_DEFAULT);
if (retval < 0) {
return retval;
}
/* I2C mode, enable timeouts */
i2c->CTRLA.reg = SERCOM_I2CM_CTRLA_MODE_I2C_MASTER |
#ifdef SERCOM_I2CM_CTRLA_LOWTOUTEN
SERCOM_I2CM_CTRLA_LOWTOUTEN |
#endif
SERCOM_I2CM_CTRLA_INACTOUT(0x3);
wait_synchronization(i2c);
/* Enable smart mode (auto ACK) */
i2c->CTRLB.reg = SERCOM_I2CM_CTRLB_SMEN;
wait_synchronization(i2c);
retval = i2c_sam0_set_apply_bitrate(dev,
i2c_map_dt_bitrate(cfg->bitrate));
if (retval != 0) {
return retval;
}
k_sem_init(&data->lock, 1, 1);
k_sem_init(&data->sem, 0, 1);
cfg->irq_config_func(dev);
#ifdef CONFIG_I2C_SAM0_DMA_DRIVEN
if (!device_is_ready(cfg->dma_dev)) {
return -ENODEV;
}
#endif
i2c->CTRLA.bit.ENABLE = 1;
wait_synchronization(i2c);
/* Force bus idle */
i2c->STATUS.bit.BUSSTATE = 1;
wait_synchronization(i2c);
return 0;
}
static const struct i2c_driver_api i2c_sam0_driver_api = {
.configure = i2c_sam0_configure,
.transfer = i2c_sam0_transfer,
};
#ifdef CONFIG_I2C_SAM0_DMA_DRIVEN
#define I2C_SAM0_DMA_CHANNELS(n) \
.dma_dev = DEVICE_DT_GET(ATMEL_SAM0_DT_INST_DMA_CTLR(n, tx)), \
.write_dma_request = ATMEL_SAM0_DT_INST_DMA_TRIGSRC(n, tx), \
.read_dma_request = ATMEL_SAM0_DT_INST_DMA_TRIGSRC(n, rx), \
.dma_channel = ATMEL_SAM0_DT_INST_DMA_CHANNEL(n, rx),
#else
#define I2C_SAM0_DMA_CHANNELS(n)
#endif
#define SAM0_I2C_IRQ_CONNECT(n, m) \
do { \
IRQ_CONNECT(DT_INST_IRQ_BY_IDX(n, m, irq), \
DT_INST_IRQ_BY_IDX(n, m, priority), \
i2c_sam0_isr, \
DEVICE_DT_INST_GET(n), 0); \
irq_enable(DT_INST_IRQ_BY_IDX(n, m, irq)); \
} while (false)
#if DT_INST_IRQ_HAS_IDX(0, 3)
#define I2C_SAM0_IRQ_HANDLER(n) \
static void i2c_sam0_irq_config_##n(const struct device *dev) \
{ \
SAM0_I2C_IRQ_CONNECT(n, 0); \
SAM0_I2C_IRQ_CONNECT(n, 1); \
SAM0_I2C_IRQ_CONNECT(n, 2); \
SAM0_I2C_IRQ_CONNECT(n, 3); \
}
#else
#define I2C_SAM0_IRQ_HANDLER(n) \
static void i2c_sam0_irq_config_##n(const struct device *dev) \
{ \
SAM0_I2C_IRQ_CONNECT(n, 0); \
}
#endif
#ifdef MCLK
#define I2C_SAM0_CONFIG(n) \
static const struct i2c_sam0_dev_config i2c_sam0_dev_config_##n = { \
.regs = (SercomI2cm *)DT_INST_REG_ADDR(n), \
.pcfg = PINCTRL_DT_INST_DEV_CONFIG_GET(n), \
.bitrate = DT_INST_PROP(n, clock_frequency), \
.mclk = (volatile uint32_t *)MCLK_MASK_DT_INT_REG_ADDR(n), \
.mclk_mask = BIT(DT_INST_CLOCKS_CELL_BY_NAME(n, mclk, bit)), \
.gclk_core_id = DT_INST_CLOCKS_CELL_BY_NAME(n, gclk, periph_ch),\
.irq_config_func = &i2c_sam0_irq_config_##n, \
I2C_SAM0_DMA_CHANNELS(n) \
}
#else /* !MCLK */
#define I2C_SAM0_CONFIG(n) \
static const struct i2c_sam0_dev_config i2c_sam0_dev_config_##n = { \
.regs = (SercomI2cm *)DT_INST_REG_ADDR(n), \
.pcfg = PINCTRL_DT_INST_DEV_CONFIG_GET(n), \
.bitrate = DT_INST_PROP(n, clock_frequency), \
.pm_apbcmask = BIT(DT_INST_CLOCKS_CELL_BY_NAME(n, pm, bit)), \
.gclk_clkctrl_id = DT_INST_CLOCKS_CELL_BY_NAME(n, gclk, clkctrl_id),\
.irq_config_func = &i2c_sam0_irq_config_##n, \
I2C_SAM0_DMA_CHANNELS(n) \
}
#endif
#define I2C_SAM0_DEVICE(n) \
PINCTRL_DT_INST_DEFINE(n); \
static void i2c_sam0_irq_config_##n(const struct device *dev); \
I2C_SAM0_CONFIG(n); \
static struct i2c_sam0_dev_data i2c_sam0_dev_data_##n; \
I2C_DEVICE_DT_INST_DEFINE(n, \
i2c_sam0_initialize, \
NULL, \
&i2c_sam0_dev_data_##n, \
&i2c_sam0_dev_config_##n, POST_KERNEL, \
CONFIG_I2C_INIT_PRIORITY, \
&i2c_sam0_driver_api); \
I2C_SAM0_IRQ_HANDLER(n)
DT_INST_FOREACH_STATUS_OKAY(I2C_SAM0_DEVICE)