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zephyr/drivers/i2c/i2c_bcm_iproc.c

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/*
* Copyright 2020 Broadcom
* Copyright 2024 Meta Platforms
*
* SPDX-License-Identifier: Apache-2.0
*/
#define DT_DRV_COMPAT brcm_iproc_i2c
#include <errno.h>
#include <stdint.h>
#include <zephyr/drivers/i2c.h>
#include <zephyr/sys/util.h>
#include <zephyr/logging/log.h>
#define LOG_LEVEL CONFIG_I2C_LOG_LEVEL
LOG_MODULE_REGISTER(iproc_i2c);
#include "i2c-priv.h"
/* Registers */
#define CFG_OFFSET 0x00
#define CFG_RESET_SHIFT 31
#define CFG_EN_SHIFT 30
#define CFG_M_RETRY_CNT_SHIFT 16
#define CFG_M_RETRY_CNT_MASK 0x0f
#define TIM_CFG_OFFSET 0x04
#define TIM_CFG_MODE_400_SHIFT 31
#define TIM_RAND_TARGET_STRETCH_SHIFT 24
#define TIM_RAND_TARGET_STRETCH_MASK 0x7f
#define S_ADDR_OFFSET 0x08
#define S_ADDR_OFFSET_ADDR0_MASK 0x7f
#define S_ADDR_OFFSET_ADDR0_SHIFT 0
#define S_ADDR_OFFSET_ADDR0_EN_BIT 7
#define M_FIFO_CTRL_OFFSET 0x0c
#define M_FIFO_RX_FLUSH_SHIFT 31
#define M_FIFO_TX_FLUSH_SHIFT 30
#define M_FIFO_RX_CNT_SHIFT 16
#define M_FIFO_RX_CNT_MASK 0x7f
#define M_FIFO_RX_THLD_SHIFT 8
#define M_FIFO_RX_THLD_MASK 0x3f
#define S_FIFO_CTRL_OFFSET 0x10
#define S_FIFO_RX_FLUSH_SHIFT 31
#define S_FIFO_TX_FLUSH_SHIFT 30
#define M_CMD_OFFSET 0x30
#define M_CMD_START_BUSY_SHIFT 31
#define M_CMD_STATUS_SHIFT 25
#define M_CMD_STATUS_MASK 0x07
#define M_CMD_STATUS_SUCCESS 0x0
#define M_CMD_STATUS_LOST_ARB 0x1
#define M_CMD_STATUS_NACK_ADDR 0x2
#define M_CMD_STATUS_NACK_DATA 0x3
#define M_CMD_STATUS_TIMEOUT 0x4
#define M_CMD_STATUS_FIFO_UNDERRUN 0x5
#define M_CMD_STATUS_RX_FIFO_FULL 0x6
#define M_CMD_SMB_PROT_SHIFT 9
#define M_CMD_SMB_PROT_QUICK 0x0
#define M_CMD_SMB_PROT_MASK 0xf
#define M_CMD_SMB_PROT_BLK_WR 0x7
#define M_CMD_SMB_PROT_BLK_RD 0x8
#define M_CMD_PEC_SHIFT 8
#define M_CMD_RD_CNT_MASK 0xff
#define S_CMD_OFFSET 0x34
#define S_CMD_START_BUSY_SHIFT 31
#define S_CMD_STATUS_SHIFT 23
#define S_CMD_STATUS_MASK 0x07
#define S_CMD_STATUS_TIMEOUT 0x5
#define S_CMD_STATUS_MASTER_ABORT 0x7
#define IE_OFFSET 0x38
#define IE_M_RX_FIFO_FULL_SHIFT 31
#define IE_M_RX_THLD_SHIFT 30
#define IE_M_START_BUSY_SHIFT 28
#define IE_M_TX_UNDERRUN_SHIFT 27
#define IE_S_RX_FIFO_FULL_SHIFT 26
#define IE_S_RX_THLD_SHIFT 25
#define IE_S_RX_EVENT_SHIFT 24
#define IE_S_START_BUSY_SHIFT 23
#define IE_S_TX_UNDERRUN_SHIFT 22
#define IE_S_RD_EN_SHIFT 21
#define IS_OFFSET 0x3c
#define IS_M_RX_FIFO_FULL_SHIFT 31
#define IS_M_RX_THLD_SHIFT 30
#define IS_M_START_BUSY_SHIFT 28
#define IS_M_TX_UNDERRUN_SHIFT 27
#define IS_S_RX_FIFO_FULL_SHIFT 26
#define IS_S_RX_THLD_SHIFT 25
#define IS_S_RX_EVENT_SHIFT 24
#define IS_S_START_BUSY_SHIFT 23
#define IS_S_TX_UNDERRUN_SHIFT 22
#define IS_S_RD_EN_SHIFT 21
#define M_TX_OFFSET 0x40
#define M_TX_WR_STATUS_SHIFT 31
#define M_TX_DATA_MASK 0xff
#define M_RX_OFFSET 0x44
#define M_RX_STATUS_SHIFT 30
#define M_RX_STATUS_MASK 0x03
#define M_RX_PEC_ERR_SHIFT 29
#define M_RX_DATA_SHIFT 0
#define M_RX_DATA_MASK 0xff
#define S_TX_OFFSET 0x48
#define S_TX_WR_STATUS_SHIFT 31
#define S_RX_OFFSET 0x4c
#define S_RX_STATUS_SHIFT 30
#define S_RX_STATUS_MASK 0x03
#define S_RX_DATA_SHIFT 0x0
#define S_RX_DATA_MASK 0xff
#define I2C_TIMEOUT_MSEC 100
#define TX_RX_FIFO_SIZE 64
#define M_RX_FIFO_MAX_THLD_VALUE (TX_RX_FIFO_SIZE - 1)
#define M_RX_FIFO_THLD_VALUE 50
#define I2C_MAX_TARGET_ADDR 0x7f
#define I2C_TARGET_RX_FIFO_EMPTY 0x0
#define I2C_TARGET_RX_START 0x1
#define I2C_TARGET_RX_DATA 0x2
#define I2C_TARGET_RX_END 0x3
#define IE_S_ALL_INTERRUPT_SHIFT 21
#define IE_S_ALL_INTERRUPT_MASK 0x3f
#define TARGET_CLOCK_STRETCH_TIME 25
/*
* To keep running in ISR for less time,
* max target read per interrupt is set to 10 bytes.
*/
#define MAX_TARGET_RX_PER_INT 10
#define ISR_MASK_TARGET \
(BIT(IS_S_START_BUSY_SHIFT) | BIT(IS_S_RX_EVENT_SHIFT) | BIT(IS_S_RD_EN_SHIFT) | \
BIT(IS_S_TX_UNDERRUN_SHIFT) | BIT(IS_S_RX_FIFO_FULL_SHIFT) | BIT(IS_S_RX_THLD_SHIFT))
#define ISR_MASK \
(BIT(IS_M_START_BUSY_SHIFT) | BIT(IS_M_TX_UNDERRUN_SHIFT) | BIT(IS_M_RX_THLD_SHIFT))
#define DEV_CFG(dev) ((struct iproc_i2c_config *)(dev)->config)
#define DEV_DATA(dev) ((struct iproc_i2c_data *)(dev)->data)
#define DEV_BASE(dev) ((DEV_CFG(dev))->base)
struct iproc_i2c_config {
mem_addr_t base;
uint32_t bitrate;
void (*irq_config_func)(const struct device *dev);
};
struct iproc_i2c_data {
struct i2c_target_config *target_cfg;
struct i2c_msg *msg;
uint32_t tx_bytes;
uint32_t rx_bytes;
uint32_t thld_bytes;
uint32_t tx_underrun;
struct k_sem device_sync_sem;
uint32_t target_int_mask;
bool rx_start_rcvd;
bool target_read_complete;
bool target_rx_only;
};
static void iproc_i2c_enable_disable(const struct device *dev, bool enable)
{
mem_addr_t base = DEV_BASE(dev);
uint32_t val;
val = sys_read32(base + CFG_OFFSET);
if (enable) {
val |= BIT(CFG_EN_SHIFT);
} else {
val &= ~BIT(CFG_EN_SHIFT);
}
sys_write32(val, base + CFG_OFFSET);
}
static void iproc_i2c_reset_controller(const struct device *dev)
{
mem_addr_t base = DEV_BASE(dev);
uint32_t val;
/* put controller in reset */
val = sys_read32(base + CFG_OFFSET);
val |= BIT(CFG_RESET_SHIFT);
val &= ~BIT(CFG_EN_SHIFT);
sys_write32(val, base + CFG_OFFSET);
k_busy_wait(100);
/* bring controller out of reset */
sys_clear_bit(base + CFG_OFFSET, CFG_RESET_SHIFT);
}
#ifdef CONFIG_I2C_TARGET
/* Set target addr */
static int iproc_i2c_target_set_address(const struct device *dev, uint16_t addr)
{
mem_addr_t base = DEV_BASE(dev);
uint32_t val;
if ((addr == 0) && (addr > I2C_MAX_TARGET_ADDR)) {
LOG_ERR("Invalid target address(0x%x) received", addr);
return -EINVAL;
}
addr = ((addr & S_ADDR_OFFSET_ADDR0_MASK) | BIT(S_ADDR_OFFSET_ADDR0_EN_BIT));
val = sys_read32(base + S_ADDR_OFFSET);
val &= ~(S_ADDR_OFFSET_ADDR0_MASK | BIT(S_ADDR_OFFSET_ADDR0_EN_BIT));
val |= addr;
sys_write32(val, base + S_ADDR_OFFSET);
return 0;
}
static int iproc_i2c_target_init(const struct device *dev, bool need_reset)
{
struct iproc_i2c_data *dd = DEV_DATA(dev);
mem_addr_t base = DEV_BASE(dev);
struct i2c_target_config *target_config = dd->target_cfg;
uint32_t val;
int ret;
if (need_reset) {
iproc_i2c_reset_controller(dev);
}
/* flush target TX/RX FIFOs */
val = BIT(S_FIFO_RX_FLUSH_SHIFT) | BIT(S_FIFO_TX_FLUSH_SHIFT);
sys_write32(val, base + S_FIFO_CTRL_OFFSET);
/* Maximum target stretch time */
val = sys_read32(base + TIM_CFG_OFFSET);
val &= ~(TIM_RAND_TARGET_STRETCH_MASK << TIM_RAND_TARGET_STRETCH_SHIFT);
val |= (TARGET_CLOCK_STRETCH_TIME << TIM_RAND_TARGET_STRETCH_SHIFT);
sys_write32(val, base + TIM_CFG_OFFSET);
/* Set target address */
ret = iproc_i2c_target_set_address(dev, target_config->address);
if (ret) {
return ret;
}
/* clear all pending target interrupts */
sys_write32(ISR_MASK_TARGET, base + IS_OFFSET);
/* Enable interrupt register to indicate a valid byte in receive fifo */
val = BIT(IE_S_RX_EVENT_SHIFT);
/* Enable interrupt register to indicate target Rx FIFO Full */
val |= BIT(IE_S_RX_FIFO_FULL_SHIFT);
/* Enable interrupt register to indicate a Master read transaction */
val |= BIT(IE_S_RD_EN_SHIFT);
/* Enable interrupt register for the target BUSY command */
val |= BIT(IE_S_START_BUSY_SHIFT);
dd->target_int_mask = val;
sys_write32(val, base + IE_OFFSET);
return ret;
}
static int iproc_i2c_check_target_status(const struct device *dev)
{
mem_addr_t base = DEV_BASE(dev);
uint32_t val;
val = sys_read32(base + S_CMD_OFFSET);
/* status is valid only when START_BUSY is cleared after it was set */
if (val & BIT(S_CMD_START_BUSY_SHIFT)) {
return -EBUSY;
}
val = (val >> S_CMD_STATUS_SHIFT) & S_CMD_STATUS_MASK;
if ((val == S_CMD_STATUS_TIMEOUT) || (val == S_CMD_STATUS_MASTER_ABORT)) {
if (val == S_CMD_STATUS_TIMEOUT) {
LOG_ERR("target random stretch time timeout");
} else if (val == S_CMD_STATUS_MASTER_ABORT) {
LOG_ERR("Master aborted read transaction");
}
/* re-initialize i2c for recovery */
iproc_i2c_enable_disable(dev, false);
iproc_i2c_target_init(dev, true);
iproc_i2c_enable_disable(dev, true);
return -ETIMEDOUT;
}
return 0;
}
static void iproc_i2c_target_read(const struct device *dev)
{
struct iproc_i2c_data *dd = DEV_DATA(dev);
struct i2c_target_config *target_cfg = dd->target_cfg;
mem_addr_t base = DEV_BASE(dev);
uint8_t rx_data, rx_status;
uint32_t rx_bytes = 0;
uint32_t val;
while (rx_bytes < MAX_TARGET_RX_PER_INT) {
val = sys_read32(base + S_RX_OFFSET);
rx_status = (val >> S_RX_STATUS_SHIFT) & S_RX_STATUS_MASK;
rx_data = ((val >> S_RX_DATA_SHIFT) & S_RX_DATA_MASK);
if (rx_status == I2C_TARGET_RX_START) {
/* Start of SMBUS Master write */
target_cfg->callbacks->write_requested(target_cfg);
dd->rx_start_rcvd = true;
dd->target_read_complete = false;
} else if ((rx_status == I2C_TARGET_RX_DATA) && dd->rx_start_rcvd) {
/* Middle of SMBUS Master write */
target_cfg->callbacks->write_received(target_cfg, rx_data);
} else if ((rx_status == I2C_TARGET_RX_END) && dd->rx_start_rcvd) {
/* End of SMBUS Master write */
if (dd->target_rx_only) {
target_cfg->callbacks->write_received(target_cfg, rx_data);
}
target_cfg->callbacks->stop(target_cfg);
} else if (rx_status == I2C_TARGET_RX_FIFO_EMPTY) {
dd->rx_start_rcvd = false;
dd->target_read_complete = true;
break;
}
rx_bytes++;
}
}
static void iproc_i2c_target_rx(const struct device *dev)
{
struct iproc_i2c_data *dd = DEV_DATA(dev);
mem_addr_t base = DEV_BASE(dev);
iproc_i2c_target_read(dev);
if (!dd->target_rx_only && dd->target_read_complete) {
/*
* In case of single byte master-read request,
* IS_S_TX_UNDERRUN_SHIFT event is generated before
* IS_S_START_BUSY_SHIFT event. Hence start target data send
* from first IS_S_TX_UNDERRUN_SHIFT event.
*
* This means don't send any data from target when
* IS_S_RD_EN_SHIFT event is generated else it will increment
* eeprom or other backend target driver read pointer twice.
*/
dd->tx_underrun = 0;
dd->target_int_mask |= BIT(IE_S_TX_UNDERRUN_SHIFT);
/* clear IS_S_RD_EN_SHIFT interrupt */
sys_write32(BIT(IS_S_RD_EN_SHIFT), base + IS_OFFSET);
}
/* enable target interrupts */
sys_write32(dd->target_int_mask, base + IE_OFFSET);
}
static void iproc_i2c_target_isr(const struct device *dev, uint32_t status)
{
struct iproc_i2c_data *dd = DEV_DATA(dev);
struct i2c_target_config *target_cfg = dd->target_cfg;
mem_addr_t base = DEV_BASE(dev);
uint32_t val;
uint8_t data;
LOG_DBG("iproc_i2c(0x%x): %s: sl_sts 0x%x", (uint32_t)base, __func__, status);
if (status & BIT(IS_S_RX_EVENT_SHIFT) || status & BIT(IS_S_RD_EN_SHIFT) ||
status & BIT(IS_S_RX_FIFO_FULL_SHIFT)) {
/* disable target interrupts */
val = sys_read32(base + IE_OFFSET);
val &= ~dd->target_int_mask;
sys_write32(val, base + IE_OFFSET);
if (status & BIT(IS_S_RD_EN_SHIFT)) {
/* Master-write-read request */
dd->target_rx_only = false;
} else {
/* Master-write request only */
dd->target_rx_only = true;
}
/*
* Clear IS_S_RX_EVENT_SHIFT &
* IS_S_RX_FIFO_FULL_SHIFT interrupt
*/
val = BIT(IS_S_RX_EVENT_SHIFT);
if (status & BIT(IS_S_RX_FIFO_FULL_SHIFT)) {
val |= BIT(IS_S_RX_FIFO_FULL_SHIFT);
}
sys_write32(val, base + IS_OFFSET);
iproc_i2c_target_rx(dev);
}
if (status & BIT(IS_S_TX_UNDERRUN_SHIFT)) {
dd->tx_underrun++;
if (dd->tx_underrun == 1) {
/* Start of SMBUS for Master Read */
target_cfg->callbacks->read_requested(target_cfg, &data);
} else {
/* Master read other than start */
target_cfg->callbacks->read_processed(target_cfg, &data);
}
sys_write32(data, base + S_TX_OFFSET);
/* start transfer */
val = BIT(S_CMD_START_BUSY_SHIFT);
sys_write32(val, base + S_CMD_OFFSET);
sys_write32(BIT(IS_S_TX_UNDERRUN_SHIFT), base + IS_OFFSET);
}
/* Stop received from master in case of master read transaction */
if (status & BIT(IS_S_START_BUSY_SHIFT)) {
/*
* Disable interrupt for TX FIFO becomes empty and
* less than PKT_LENGTH bytes were output on the SMBUS
*/
dd->target_int_mask &= ~BIT(IE_S_TX_UNDERRUN_SHIFT);
sys_write32(dd->target_int_mask, base + IE_OFFSET);
/* End of SMBUS for Master Read */
val = BIT(S_TX_WR_STATUS_SHIFT);
sys_write32(val, base + S_TX_OFFSET);
val = BIT(S_CMD_START_BUSY_SHIFT);
sys_write32(val, base + S_CMD_OFFSET);
/* flush TX FIFOs */
val = sys_read32(base + S_FIFO_CTRL_OFFSET);
val |= (BIT(S_FIFO_TX_FLUSH_SHIFT));
sys_write32(val, base + S_FIFO_CTRL_OFFSET);
target_cfg->callbacks->stop(target_cfg);
sys_write32(BIT(IS_S_START_BUSY_SHIFT), base + IS_OFFSET);
}
/* check target transmit status only if target is transmitting */
if (!dd->target_rx_only) {
iproc_i2c_check_target_status(dev);
}
}
static int iproc_i2c_target_register(const struct device *dev,
struct i2c_target_config *target_config)
{
struct iproc_i2c_data *dd = DEV_DATA(dev);
mem_addr_t base = DEV_BASE(dev);
int ret = 0;
if (dd->target_cfg) {
LOG_ERR("Target already registered");
return -EBUSY;
}
/* Save pointer to received target config */
dd->target_cfg = target_config;
ret = iproc_i2c_target_init(dev, false);
if (ret < 0) {
LOG_ERR("Failed to register iproc_i2c(0x%x) as target, ret %d", (uint32_t)base,
ret);
return ret;
}
return 0;
}
static int iproc_i2c_target_unregister(const struct device *dev, struct i2c_target_config *config)
{
uint32_t val;
mem_addr_t base = DEV_BASE(dev);
struct iproc_i2c_data *dd = DEV_DATA(dev);
if (!dd->target_cfg) {
return -EINVAL;
}
/* Erase the target address programmed */
sys_write32(0x0, base + S_ADDR_OFFSET);
/* disable all target interrupts */
val = sys_read32(base + IE_OFFSET);
val &= ~(IE_S_ALL_INTERRUPT_MASK << IE_S_ALL_INTERRUPT_SHIFT);
sys_write32(val, base + IE_OFFSET);
dd->target_cfg = NULL;
return 0;
}
#endif /* CONFIG_I2C_TARGET */
static void iproc_i2c_common_init(const struct device *dev)
{
mem_addr_t base = DEV_BASE(dev);
uint32_t val;
iproc_i2c_reset_controller(dev);
/* flush TX/RX FIFOs and set RX FIFO threshold to zero */
val = BIT(M_FIFO_RX_FLUSH_SHIFT) | BIT(M_FIFO_TX_FLUSH_SHIFT);
sys_write32(val, base + M_FIFO_CTRL_OFFSET);
/* disable all interrupts */
sys_write32(0, base + IE_OFFSET);
/* clear all pending interrupts */
sys_write32(~0, base + IS_OFFSET);
}
static int iproc_i2c_check_status(const struct device *dev, uint16_t dev_addr, struct i2c_msg *msg)
{
mem_addr_t base = DEV_BASE(dev);
uint32_t val;
int rc;
val = sys_read32(base + M_CMD_OFFSET);
val >>= M_CMD_STATUS_SHIFT;
val &= M_CMD_STATUS_MASK;
switch (val) {
case M_CMD_STATUS_SUCCESS:
rc = 0;
break;
case M_CMD_STATUS_LOST_ARB:
LOG_ERR("lost bus arbitration");
rc = -EAGAIN;
break;
case M_CMD_STATUS_NACK_ADDR:
LOG_ERR("NAK addr:0x%02x", dev_addr);
rc = -ENXIO;
break;
case M_CMD_STATUS_NACK_DATA:
LOG_ERR("NAK data");
rc = -ENXIO;
break;
case M_CMD_STATUS_TIMEOUT:
LOG_ERR("bus timeout");
rc = -ETIMEDOUT;
break;
case M_CMD_STATUS_FIFO_UNDERRUN:
LOG_ERR("FIFO Under-run");
rc = -ENXIO;
break;
case M_CMD_STATUS_RX_FIFO_FULL:
LOG_ERR("RX FIFO full");
rc = -ETIMEDOUT;
break;
default:
LOG_ERR("Unknown Error : 0x%x", val);
iproc_i2c_enable_disable(dev, false);
iproc_i2c_common_init(dev);
iproc_i2c_enable_disable(dev, true);
rc = -EIO;
break;
}
if (rc < 0) {
/* flush both Master TX/RX FIFOs */
val = BIT(M_FIFO_RX_FLUSH_SHIFT) | BIT(M_FIFO_TX_FLUSH_SHIFT);
sys_write32(val, base + M_FIFO_CTRL_OFFSET);
}
return rc;
}
static int iproc_i2c_configure(const struct device *dev, uint32_t dev_cfg_raw)
{
mem_addr_t base = DEV_BASE(dev);
if (I2C_ADDR_10_BITS & dev_cfg_raw) {
LOG_ERR("10-bit addressing not supported");
return -ENOTSUP;
}
switch (I2C_SPEED_GET(dev_cfg_raw)) {
case I2C_SPEED_STANDARD:
sys_clear_bit(base + TIM_CFG_OFFSET, TIM_CFG_MODE_400_SHIFT);
break;
case I2C_SPEED_FAST:
sys_set_bit(base + TIM_CFG_OFFSET, TIM_CFG_MODE_400_SHIFT);
break;
default:
LOG_ERR("Only standard or Fast speed modes are supported");
return -ENOTSUP;
}
return 0;
}
static void iproc_i2c_read_valid_bytes(const struct device *dev)
{
mem_addr_t base = DEV_BASE(dev);
struct iproc_i2c_data *dd = DEV_DATA(dev);
struct i2c_msg *msg = dd->msg;
uint32_t val;
/* Read valid data from RX FIFO */
while (dd->rx_bytes < msg->len) {
val = sys_read32(base + M_RX_OFFSET);
/* rx fifo empty */
if (!((val >> M_RX_STATUS_SHIFT) & M_RX_STATUS_MASK)) {
break;
}
msg->buf[dd->rx_bytes] = (val >> M_RX_DATA_SHIFT) & M_RX_DATA_MASK;
dd->rx_bytes++;
}
}
static int iproc_i2c_data_recv(const struct device *dev)
{
struct iproc_i2c_data *dd = DEV_DATA(dev);
mem_addr_t base = DEV_BASE(dev);
struct i2c_msg *msg = dd->msg;
uint32_t bytes_left, val;
iproc_i2c_read_valid_bytes(dev);
bytes_left = msg->len - dd->rx_bytes;
if (bytes_left == 0) {
/* finished reading all data, disable rx thld event */
sys_clear_bit(base + IE_OFFSET, IS_M_RX_THLD_SHIFT);
} else if (bytes_left < dd->thld_bytes) {
/* set bytes left as threshold */
val = sys_read32(base + M_FIFO_CTRL_OFFSET);
val &= ~(M_FIFO_RX_THLD_MASK << M_FIFO_RX_THLD_SHIFT);
val |= (bytes_left << M_FIFO_RX_THLD_SHIFT);
sys_write32(val, base + M_FIFO_CTRL_OFFSET);
dd->thld_bytes = bytes_left;
}
/*
* if bytes_left >= dd->thld_bytes, no need to change the THRESHOLD.
* It will remain as dd->thld_bytes itself
*/
return 0;
}
static int iproc_i2c_transfer_one(const struct device *dev, struct i2c_msg *msg, uint16_t dev_addr)
{
mem_addr_t base = DEV_BASE(dev);
struct iproc_i2c_data *dd = DEV_DATA(dev);
uint32_t val, addr, tx_bytes, val_intr_en;
int rc;
if (!!(sys_read32(base + M_CMD_OFFSET) & BIT(M_CMD_START_BUSY_SHIFT))) {
LOG_ERR("Bus busy, prev xfer ongoing");
return -EBUSY;
}
LOG_DBG("%s: msg dev_addr 0x%x flags 0x%x len 0x%x val 0x%x\n", __func__, dev_addr,
msg->flags, msg->len, msg->buf[0]);
/* Save current i2c_msg */
dd->msg = msg;
addr = dev_addr << 1 | (msg->flags & I2C_MSG_READ ? 1 : 0);
sys_write32(addr, base + M_TX_OFFSET);
tx_bytes = MIN(msg->len, (TX_RX_FIFO_SIZE - 1));
if (!(msg->flags & I2C_MSG_READ)) {
/* Fill master TX fifo */
for (uint32_t i = 0; i < tx_bytes; i++) {
val = msg->buf[i];
/* For the last byte, set MASTER_WR_STATUS bit */
if (i == msg->len - 1) {
val |= BIT(M_TX_WR_STATUS_SHIFT);
}
sys_write32(val, base + M_TX_OFFSET);
}
dd->tx_bytes = tx_bytes;
}
/*
* Enable the "start busy" interrupt, which will be triggered after the
* transaction is done, i.e., the internal start_busy bit, transitions
* from 1 to 0.
*/
val_intr_en = BIT(IE_M_START_BUSY_SHIFT);
if (!(msg->flags & I2C_MSG_READ) && (msg->len > dd->tx_bytes)) {
val_intr_en |= BIT(IE_M_TX_UNDERRUN_SHIFT);
}
/*
* Program master command register (0x30) with protocol type and set
* start_busy_command bit to initiate the write transaction
*/
val = BIT(M_CMD_START_BUSY_SHIFT);
if (msg->len == 0) {
/* SMBUS QUICK Command (Read/Write) */
val |= (M_CMD_SMB_PROT_QUICK << M_CMD_SMB_PROT_SHIFT);
} else if (msg->flags & I2C_MSG_READ) {
uint32_t tmp;
dd->rx_bytes = 0;
/* SMBUS Block Read Command */
val |= M_CMD_SMB_PROT_BLK_RD << M_CMD_SMB_PROT_SHIFT;
val |= msg->len;
if (msg->len > M_RX_FIFO_MAX_THLD_VALUE) {
dd->thld_bytes = M_RX_FIFO_THLD_VALUE;
} else {
dd->thld_bytes = msg->len;
}
/* set threshold value */
tmp = sys_read32(base + M_FIFO_CTRL_OFFSET);
tmp &= ~(M_FIFO_RX_THLD_MASK << M_FIFO_RX_THLD_SHIFT);
tmp |= dd->thld_bytes << M_FIFO_RX_THLD_SHIFT;
sys_write32(tmp, base + M_FIFO_CTRL_OFFSET);
/* enable the RX threshold interrupt */
val_intr_en |= BIT(IE_M_RX_THLD_SHIFT);
} else {
/* SMBUS Block Write Command */
val |= M_CMD_SMB_PROT_BLK_WR << M_CMD_SMB_PROT_SHIFT;
}
sys_write32(val_intr_en, base + IE_OFFSET);
sys_write32(val, base + M_CMD_OFFSET);
/* Wait for the transfer to complete or timeout */
rc = k_sem_take(&dd->device_sync_sem, K_MSEC(I2C_TIMEOUT_MSEC));
/* disable all interrupts */
sys_write32(0, base + IE_OFFSET);
if (rc != 0) {
/* flush both Master TX/RX FIFOs */
val = BIT(M_FIFO_RX_FLUSH_SHIFT) | BIT(M_FIFO_TX_FLUSH_SHIFT);
sys_write32(val, base + M_FIFO_CTRL_OFFSET);
return rc;
}
/* Check for Master Xfer status */
rc = iproc_i2c_check_status(dev, dev_addr, msg);
return rc;
}
static int iproc_i2c_transfer_multi(const struct device *dev, struct i2c_msg *msgs,
uint8_t num_msgs, uint16_t addr)
{
int rc;
struct i2c_msg *msgs_chk = msgs;
if (!msgs_chk) {
return -EINVAL;
}
/* pre-check all msgs */
for (uint8_t i = 0; i < num_msgs; i++, msgs_chk++) {
if (!msgs_chk->buf) {
LOG_ERR("Invalid msg buffer");
return -EINVAL;
}
if (I2C_MSG_ADDR_10_BITS & msgs_chk->flags) {
LOG_ERR("10-bit addressing not supported");
return -ENOTSUP;
}
}
for (uint8_t i = 0; i < num_msgs; i++, msgs++) {
rc = iproc_i2c_transfer_one(dev, msgs, addr);
if (rc < 0) {
return rc;
}
}
return 0;
}
static void iproc_i2c_send_data(const struct device *dev)
{
mem_addr_t base = DEV_BASE(dev);
struct iproc_i2c_data *dd = DEV_DATA(dev);
struct i2c_msg *msg = dd->msg;
uint32_t tx_bytes = msg->len - dd->tx_bytes;
/* can only fill up to the FIFO size */
tx_bytes = MIN(tx_bytes, TX_RX_FIFO_SIZE);
for (uint32_t i = 0; i < tx_bytes; i++) {
/* start from where we left over */
uint32_t idx = dd->tx_bytes + i;
uint32_t val = msg->buf[idx];
/* mark the last byte */
if (idx == (msg->len - 1)) {
uint32_t tmp;
val |= BIT(M_TX_WR_STATUS_SHIFT);
/*
* Since this is the last byte, we should now
* disable TX FIFO underrun interrupt
*/
tmp = sys_read32(base + IE_OFFSET);
tmp &= ~BIT(IE_M_TX_UNDERRUN_SHIFT);
sys_write32(tmp, base + IE_OFFSET);
}
/* load data into TX FIFO */
sys_write32(val, base + M_TX_OFFSET);
}
/* update number of transferred bytes */
dd->tx_bytes += tx_bytes;
}
static void iproc_i2c_master_isr(const struct device *dev, uint32_t status)
{
struct iproc_i2c_data *dd = DEV_DATA(dev);
/* TX FIFO is empty and we have more data to send */
if (status & BIT(IS_M_TX_UNDERRUN_SHIFT)) {
iproc_i2c_send_data(dev);
}
/* RX FIFO threshold is reached and data needs to be read out */
if (status & BIT(IS_M_RX_THLD_SHIFT)) {
iproc_i2c_data_recv(dev);
}
/* transfer is done */
if (status & BIT(IS_M_START_BUSY_SHIFT)) {
k_sem_give(&dd->device_sync_sem);
}
}
static void iproc_i2c_isr(void *arg)
{
const struct device *dev = (const struct device *)arg;
mem_addr_t base = DEV_BASE(dev);
uint32_t status;
uint32_t sl_status, curr_irqs;
curr_irqs = sys_read32(base + IE_OFFSET);
status = sys_read32(base + IS_OFFSET);
/* process only target interrupt which are enabled */
sl_status = status & curr_irqs & ISR_MASK_TARGET;
LOG_DBG("iproc_i2c(0x%x): sts 0x%x, sl_sts 0x%x, curr_ints 0x%x", (uint32_t)base, status,
sl_status, curr_irqs);
#ifdef CONFIG_I2C_TARGET
/* target events */
if (sl_status) {
iproc_i2c_target_isr(dev, sl_status);
return;
}
#endif
status &= ISR_MASK;
/* master events */
if (status) {
iproc_i2c_master_isr(dev, status);
sys_write32(status, base + IS_OFFSET);
}
}
static int iproc_i2c_init(const struct device *dev)
{
const struct iproc_i2c_config *config = DEV_CFG(dev);
struct iproc_i2c_data *dd = DEV_DATA(dev);
uint32_t bitrate = config->bitrate;
int error;
k_sem_init(&dd->device_sync_sem, 0, 1);
iproc_i2c_common_init(dev);
/* Set default clock frequency */
bitrate = i2c_map_dt_bitrate(bitrate);
if (dd->target_cfg == NULL) {
bitrate |= I2C_MODE_CONTROLLER;
}
error = iproc_i2c_configure(dev, bitrate);
if (error) {
return error;
}
config->irq_config_func(dev);
iproc_i2c_enable_disable(dev, true);
return 0;
}
static const struct i2c_driver_api iproc_i2c_driver_api = {
.configure = iproc_i2c_configure,
.transfer = iproc_i2c_transfer_multi,
#ifdef CONFIG_I2C_TARGET
.target_register = iproc_i2c_target_register,
.target_unregister = iproc_i2c_target_unregister,
#endif
#ifdef CONFIG_I2C_RTIO
.iodev_submit = i2c_iodev_submit_fallback,
#endif
};
#define IPROC_I2C_DEVICE_INIT(n) \
static void iproc_i2c_irq_config_func_##n(const struct device *dev) \
{ \
ARG_UNUSED(dev); \
IRQ_CONNECT(DT_INST_IRQN(n), DT_INST_IRQ(n, priority), iproc_i2c_isr, \
DEVICE_DT_INST_GET(n), 0); \
\
irq_enable(DT_INST_IRQN(n)); \
} \
\
static const struct iproc_i2c_config iproc_i2c_config_##n = { \
.base = DT_INST_REG_ADDR(n), \
.irq_config_func = iproc_i2c_irq_config_func_##n, \
.bitrate = DT_INST_PROP(n, clock_frequency), \
}; \
\
static struct iproc_i2c_data iproc_i2c_data_##n; \
\
I2C_DEVICE_DT_INST_DEFINE(n, &iproc_i2c_init, NULL, &iproc_i2c_data_##n, \
&iproc_i2c_config_##n, POST_KERNEL, CONFIG_I2C_INIT_PRIORITY, \
&iproc_i2c_driver_api);
DT_INST_FOREACH_STATUS_OKAY(IPROC_I2C_DEVICE_INIT)
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