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zephyr/drivers/i3c/i3c_mcux.c

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/*
* Copyright (c) 2016 Freescale Semiconductor, Inc.
* Copyright (c) 2019 NXP
* Copyright (c) 2022 Intel Corporation
*
* SPDX-License-Identifier: Apache-2.0
*/
#define DT_DRV_COMPAT nxp_mcux_i3c
#include <string.h>
#include <zephyr/device.h>
#include <zephyr/irq.h>
#include <zephyr/sys/__assert.h>
#include <zephyr/sys/sys_io.h>
#include <zephyr/drivers/clock_control.h>
#include <zephyr/drivers/i3c.h>
#include <zephyr/drivers/pinctrl.h>
/*
* This is from NXP HAL which contains register bits macros
* which are used in this driver.
*/
#include <fsl_i3c.h>
#include <zephyr/logging/log.h>
LOG_MODULE_REGISTER(i3c_mcux, CONFIG_I3C_MCUX_LOG_LEVEL);
#define I3C_MCTRL_REQUEST_NONE I3C_MCTRL_REQUEST(0)
#define I3C_MCTRL_REQUEST_EMIT_START_ADDR I3C_MCTRL_REQUEST(1)
#define I3C_MCTRL_REQUEST_EMIT_STOP I3C_MCTRL_REQUEST(2)
#define I3C_MCTRL_REQUEST_IBI_ACK_NACK I3C_MCTRL_REQUEST(3)
#define I3C_MCTRL_REQUEST_PROCESS_DAA I3C_MCTRL_REQUEST(4)
#define I3C_MCTRL_REQUEST_FORCE_EXIT I3C_MCTRL_REQUEST(6)
#define I3C_MCTRL_REQUEST_AUTO_IBI I3C_MCTRL_REQUEST(7)
#define I3C_MCTRL_IBIRESP_ACK I3C_MCTRL_IBIRESP(0)
#define I3C_MCTRL_IBIRESP_ACK_AUTO I3C_MCTRL_IBIRESP(0)
#define I3C_MCTRL_IBIRESP_NACK I3C_MCTRL_IBIRESP(1)
#define I3C_MCTRL_IBIRESP_ACK_WITH_BYTE I3C_MCTRL_IBIRESP(2)
#define I3C_MCTRL_IBIRESP_MANUAL I3C_MCTRL_IBIRESP(3)
#define I3C_MCTRL_TYPE_I3C I3C_MCTRL_TYPE(0)
#define I3C_MCTRL_TYPE_I2C I3C_MCTRL_TYPE(1)
#define I3C_MCTRL_DIR_WRITE I3C_MCTRL_DIR(0)
#define I3C_MCTRL_DIR_READ I3C_MCTRL_DIR(1)
#define I3C_MSTATUS_STATE_IDLE I3C_MSTATUS_STATE(0)
#define I3C_MSTATUS_STATE_SLVREQ I3C_MSTATUS_STATE(1)
#define I3C_MSTATUS_STATE_MSGSDR I3C_MSTATUS_STATE(2)
#define I3C_MSTATUS_STATE_NORMACT I3C_MSTATUS_STATE(3)
#define I3C_MSTATUS_STATE_MSGDDR I3C_MSTATUS_STATE(4)
#define I3C_MSTATUS_STATE_DAA I3C_MSTATUS_STATE(5)
#define I3C_MSTATUS_STATE_IBIACK I3C_MSTATUS_STATE(6)
#define I3C_MSTATUS_STATE_IBIRCV I3C_MSTATUS_STATE(7)
#define I3C_MSTATUS_IBITYPE_NONE I3C_MSTATUS_IBITYPE(0)
#define I3C_MSTATUS_IBITYPE_IBI I3C_MSTATUS_IBITYPE(1)
#define I3C_MSTATUS_IBITYPE_MR I3C_MSTATUS_IBITYPE(2)
#define I3C_MSTATUS_IBITYPE_HJ I3C_MSTATUS_IBITYPE(3)
struct mcux_i3c_config {
/** Common I3C Driver Config */
struct i3c_driver_config common;
/** Pointer to controller registers. */
I3C_Type *base;
/** Pointer to the clock device. */
const struct device *clock_dev;
/** Clock control subsys related struct. */
clock_control_subsys_t clock_subsys;
/** Pointer to pin control device. */
const struct pinctrl_dev_config *pincfg;
/** Interrupt configuration function. */
void (*irq_config_func)(const struct device *dev);
/** Disable open drain high push pull */
bool disable_open_drain_high_pp;
};
struct mcux_i3c_data {
/** Common I3C Driver Data */
struct i3c_driver_data common;
/** Mutex to serialize access */
struct k_mutex lock;
/** Condvar for waiting for bus to be in IDLE state */
struct k_condvar condvar;
struct {
/**
* Clock divider for use when generating clock for
* I3C Push-pull mode.
*/
uint8_t clk_div_pp;
/**
* Clock divider for use when generating clock for
* I3C open drain mode.
*/
uint8_t clk_div_od;
/**
* Clock divider for the slow time control clock.
*/
uint8_t clk_div_tc;
/** I3C open drain clock frequency in Hz. */
uint32_t i3c_od_scl_hz;
} clocks;
#ifdef CONFIG_I3C_USE_IBI
struct {
/** List of addresses used in the MIBIRULES register. */
uint8_t addr[5];
/** Number of valid addresses in MIBIRULES. */
uint8_t num_addr;
/** True if all addresses have MSB set. */
bool msb;
/**
* True if all target devices require mandatory byte
* for IBI.
*/
bool has_mandatory_byte;
} ibi;
#endif
};
/**
* @brief Read a register and test for bit matches with timeout.
*
* Please be aware that this uses @see k_busy_wait.
*
* @param reg Pointer to 32-bit Register.
* @param mask Mask to the register value.
* @param match Value to match for masked register value.
* @param init_delay_us Initial delay in microsecond before reading register
* (can be 0).
* @param step_delay_us Delay in microsecond between each read of register
* (cannot be 0).
* @param total_delay_us Total delay in microsecond before bailing out.
*
* @retval 0 If masked register value matches before time out.
* @retval -ETIMEDOUT Exhausted all delays without matching.
*/
static int reg32_poll_timeout(volatile uint32_t *reg,
uint32_t mask, uint32_t match,
uint32_t init_delay_us, uint32_t step_delay_us,
uint32_t total_delay_us)
{
uint32_t delayed = init_delay_us;
int ret = -ETIMEDOUT;
if (init_delay_us > 0U) {
k_busy_wait(init_delay_us);
}
while (delayed <= total_delay_us) {
if ((sys_read32((mm_reg_t)reg) & mask) == match) {
ret = 0;
break;
}
k_busy_wait(step_delay_us);
delayed += step_delay_us;
}
return ret;
}
/**
* @brief Update register value.
*
* @param reg Pointer to 32-bit Register.
* @param mask Mask to the register value.
* @param update Value to be updated in register.
*/
static inline void reg32_update(volatile uint32_t *reg,
uint32_t mask, uint32_t update)
{
uint32_t val = sys_read32((mem_addr_t)reg);
val &= ~mask;
val |= (update & mask);
sys_write32(val, (mem_addr_t)reg);
}
/**
* @brief Test if masked register value has certain value.
*
* @param reg Pointer to 32-bit register.
* @param mask Mask to test.
* @param match Value to match.
*
* @return True if bits in @p mask mask matches @p match, false otherwise.
*/
static inline bool reg32_test_match(volatile uint32_t *reg,
uint32_t mask, uint32_t match)
{
uint32_t val = sys_read32((mem_addr_t)reg);
return (val & mask) == match;
}
/**
* @brief Test if masked register value is the same as the mask.
*
* @param reg Pointer to 32-bit register.
* @param mask Mask to test.
*
* @return True if bits in @p mask are all set, false otherwise.
*/
static inline bool reg32_test(volatile uint32_t *reg, uint32_t mask)
{
return reg32_test_match(reg, mask, mask);
}
/**
* @breif Disable all interrupts.
*
* @param base Pointer to controller registers.
*
* @return Previous enabled interrupts.
*/
static uint32_t mcux_i3c_interrupt_disable(I3C_Type *base)
{
uint32_t intmask = base->MINTSET;
base->MINTCLR = intmask;
return intmask;
}
/**
* @brief Enable interrupts according to mask.
*
* @param base Pointer to controller registers.
* @param mask Interrupts to be enabled.
*
*/
static void mcux_i3c_interrupt_enable(I3C_Type *base, uint32_t mask)
{
base->MINTSET = mask;
}
/**
* @brief Check if there are any errors.
*
* This checks if MSTATUS has ERRWARN bit set.
*
* @retval True if there are any errors.
* @retval False if no errors.
*/
static bool mcux_i3c_has_error(I3C_Type *base)
{
uint32_t mstatus, merrwarn;
mstatus = base->MSTATUS;
if ((mstatus & I3C_MSTATUS_ERRWARN_MASK) == I3C_MSTATUS_ERRWARN_MASK) {
merrwarn = base->MERRWARN;
/*
* Note that this uses LOG_DBG() for displaying
* register values for debugging. In production builds,
* printing any error messages should be handled in
* callers of this function.
*/
LOG_DBG("ERROR: MSTATUS 0x%08x MERRWARN 0x%08x",
mstatus, merrwarn);
return true;
}
return false;
}
/**
* @brief Check if there are any errors, and if one of them is time out error.
*
* @retval True if controller times out on operation.
* @retval False if no time out error.
*/
static inline bool mcux_i3c_error_is_timeout(I3C_Type *base)
{
if (mcux_i3c_has_error(base)) {
if (reg32_test(&base->MERRWARN, I3C_MERRWARN_TIMEOUT_MASK)) {
return true;
}
}
return false;
}
/**
* @brief Check if there are any errors, and if one of them is NACK.
*
* NACK is generated when:
* 1. Target does not ACK the last used address.
* 2. All targets do not ACK on 0x7E.
*
* @retval True if NACK is received.
* @retval False if no NACK error.
*/
static inline bool mcux_i3c_error_is_nack(I3C_Type *base)
{
if (mcux_i3c_has_error(base)) {
if (reg32_test(&base->MERRWARN, I3C_MERRWARN_NACK_MASK)) {
return true;
}
}
return false;
}
/**
* @brief Test if certain bits are set in MSTATUS.
*
* @param base Pointer to controller registers.
* @param mask Bits to be tested.
*
* @retval True if @p mask bits are set.
* @retval False if @p mask bits are not set.
*/
static inline bool mcux_i3c_status_is_set(I3C_Type *base, uint32_t mask)
{
return reg32_test(&base->MSTATUS, mask);
}
/**
* @brief Spin wait for MSTATUS bit to be set.
*
* This spins forever for the bits to be set.
*
* @param base Pointer to controller registers.
* @param mask Bits to be tested.
*/
static inline void mcux_i3c_status_wait(I3C_Type *base, uint32_t mask)
{
/* Wait for bits to be set */
while (!mcux_i3c_status_is_set(base, mask)) {
k_busy_wait(1);
};
}
/**
* @brief Wait for MSTATUS bits to be set with time out.
*
* @param base Pointer to controller registers.
* @param mask Bits to be tested.
* @param init_delay_us Initial delay in microsecond before reading register
* (can be 0).
* @param step_delay_us Delay in microsecond between each read of register
* (cannot be 0).
* @param total_delay_us Total delay in microsecond before bailing out.
*
* @retval 0 If bits are set before time out.
* @retval -ETIMEDOUT Exhausted all delays.
*/
static inline int mcux_i3c_status_wait_timeout(I3C_Type *base, uint32_t mask,
uint32_t init_delay_us,
uint32_t step_delay_us,
uint32_t total_delay_us)
{
return reg32_poll_timeout(&base->MSTATUS, mask, mask,
init_delay_us, step_delay_us, total_delay_us);
}
/**
* @brief Clear the MSTATUS bits and wait for them to be cleared.
*
* This spins forever for the bits to be cleared;
*
* @param base Pointer to controller registers.
* @param mask Bits to be cleared.
*/
static inline void mcux_i3c_status_clear(I3C_Type *base, uint32_t mask)
{
/* Try to clear bit until it is cleared */
while (1) {
base->MSTATUS = mask;
if (!mcux_i3c_status_is_set(base, mask)) {
break;
}
k_busy_wait(1);
}
}
/**
* @brief Clear transfer and IBI related bits in MSTATUS.
*
* This spins forever for those bits to be cleared;
*
* @see I3C_MSTATUS_MCTRLDONE_MASK
* @see I3C_MSTATUS_COMPLETE_MASK
* @see I3C_MSTATUS_IBIWON_MASK
* @see I3C_MSTATUS_ERRWARN_MASK
*
* @param base Pointer to controller registers.
*/
static inline void mcux_i3c_status_clear_all(I3C_Type *base)
{
uint32_t mask = I3C_MSTATUS_MCTRLDONE_MASK |
I3C_MSTATUS_COMPLETE_MASK |
I3C_MSTATUS_IBIWON_MASK |
I3C_MSTATUS_ERRWARN_MASK;
mcux_i3c_status_clear(base, mask);
}
/**
* @brief Clear the MSTATUS bits and wait for them to be cleared with time out.
*
* @param base Pointer to controller registers.
* @param mask Bits to be cleared.
* @param init_delay_us Initial delay in microsecond before reading register
* (can be 0).
* @param step_delay_us Delay in microsecond between each read of register
* (cannot be 0).
* @param total_delay_us Total delay in microsecond before bailing out.
*
* @retval 0 If bits are cleared before time out.
* @retval -ETIMEDOUT Exhausted all delays.
*/
static inline int mcux_i3c_status_clear_timeout(I3C_Type *base, uint32_t mask,
uint32_t init_delay_us,
uint32_t step_delay_us,
uint32_t total_delay_us)
{
uint32_t delayed = init_delay_us;
int ret = -ETIMEDOUT;
/* Try to clear bit until it is cleared */
while (delayed <= total_delay_us) {
base->MSTATUS = mask;
if (!mcux_i3c_status_is_set(base, mask)) {
ret = 0;
break;
}
k_busy_wait(step_delay_us);
delayed += step_delay_us;
}
return ret;
}
/**
* @brief Spin wait for MSTATUS bit to be set, and clear it afterwards.
*
* Note that this spins forever waiting for bits to be set, and
* to be cleared.
*
* @see mcux_i3c_status_wait
* @see mcux_i3c_status_clear
*
* @param base Pointer to controller registers.
* @param mask Bits to be set and to be cleared;
*/
static inline void mcux_i3c_status_wait_clear(I3C_Type *base, uint32_t mask)
{
mcux_i3c_status_wait(base, mask);
mcux_i3c_status_clear(base, mask);
}
/**
* @brief Wait for MSTATUS bit to be set, and clear it afterwards, with time out.
*
* @see mcux_i3c_status_wait_timeout
* @see mcux_i3c_status_clear_timeout
*
* @param base Pointer to controller registers.
* @param mask Bits to be set and to be cleared.
* @param init_delay_us Initial delay in microsecond before reading register
* (can be 0).
* @param step_delay_us Delay in microsecond between each read of register
* (cannot be 0).
* @param total_delay_us Total delay in microsecond before bailing out.
*
* @retval 0 If masked register value matches before time out.
* @retval -ETIMEDOUT Exhausted all delays without matching.
*/
static inline int mcux_i3c_status_wait_clear_timeout(I3C_Type *base, uint32_t mask,
uint32_t init_delay_us,
uint32_t step_delay_us,
uint32_t total_delay_us)
{
int ret;
ret = mcux_i3c_status_wait_timeout(base, mask, init_delay_us,
step_delay_us, total_delay_us);
if (ret != 0) {
goto out;
}
ret = mcux_i3c_status_clear_timeout(base, mask, init_delay_us,
step_delay_us, total_delay_us);
out:
return ret;
}
/**
* @brief Clear the MERRWARN register.
*
* @param base Pointer to controller registers.
*/
static inline void mcux_i3c_errwarn_clear_all_nowait(I3C_Type *base)
{
base->MERRWARN = base->MERRWARN;
}
/**
* @brief Tell controller to start DAA process.
*
* @param base Pointer to controller registers.
*/
static inline void mcux_i3c_request_daa(I3C_Type *base)
{
reg32_update(&base->MCTRL,
I3C_MCTRL_REQUEST_MASK | I3C_MCTRL_IBIRESP_MASK | I3C_MCTRL_RDTERM_MASK,
I3C_MCTRL_REQUEST_PROCESS_DAA | I3C_MCTRL_IBIRESP_NACK);
}
/**
* @brief Tell controller to start auto IBI.
*
* @param base Pointer to controller registers.
*/
static inline void mcux_i3c_request_auto_ibi(I3C_Type *base)
{
reg32_update(&base->MCTRL,
I3C_MCTRL_REQUEST_MASK | I3C_MCTRL_IBIRESP_MASK | I3C_MCTRL_RDTERM_MASK,
I3C_MCTRL_REQUEST_AUTO_IBI | I3C_MCTRL_IBIRESP_ACK_AUTO);
/* AUTO_IBI should result in IBIWON bit being set in status */
mcux_i3c_status_wait_clear(base, I3C_MSTATUS_IBIWON_MASK);
}
/**
* @brief Get the controller state.
*
* @param base Pointer to controller registers.
*
* @retval I3C_MSTATUS_STATE_IDLE
* @retval I3C_MSTATUS_STATE_SLVREQ
* @retval I3C_MSTATUS_STATE_MSGSDR
* @retval I3C_MSTATUS_STATE_NORMACT
* @retval I3C_MSTATUS_STATE_MSGDDR
* @retval I3C_MSTATUS_STATE_DAA
* @retval I3C_MSTATUS_STATE_IBIACK
* @retval I3C_MSTATUS_STATE_IBIRCV
*/
static inline uint32_t mcux_i3c_state_get(I3C_Type *base)
{
uint32_t mstatus = base->MSTATUS;
uint32_t state;
/* Make sure we are in a state where we can emit STOP */
state = (mstatus & I3C_MSTATUS_STATE_MASK) >> I3C_MSTATUS_STATE_SHIFT;
return state;
}
/**
* @brief Wait for MSTATUS bit to be set, and clear it afterwards with time out.
*
* @param base Pointer to controller registers.
* @param mask Bits to be set.
* @param init_delay_us Initial delay in microsecond before reading register
* (can be 0).
* @param step_delay_us Delay in microsecond between each read of register
* (cannot be 0).
* @param total_delay_us Total delay in microsecond before bailing out.
*
* @retval 0 If masked register value matches before time out.
* @retval -ETIMEDOUT Exhausted all delays without matching.
*/
static inline int mcux_i3c_state_wait_timeout(I3C_Type *base, uint32_t state,
uint32_t init_delay_us,
uint32_t step_delay_us,
uint32_t total_delay_us)
{
uint32_t delayed = init_delay_us;
int ret = -ETIMEDOUT;
/* Try to clear bit until it is cleared */
while (delayed <= total_delay_us) {
if (mcux_i3c_state_get(base) == state) {
ret = 0;
break;
}
k_busy_wait(step_delay_us);
delayed += step_delay_us;
}
return ret;
}
/**
* @brief Wait for MSTATUS to be IDLE
*
* @param base Pointer to controller registers.
*/
static inline void mcux_i3c_wait_idle(struct mcux_i3c_data *dev_data, I3C_Type *base)
{
while (mcux_i3c_state_get(base) != I3C_MSTATUS_STATE_IDLE) {
k_condvar_wait(&dev_data->condvar,
&dev_data->lock,
K_FOREVER);
}
}
/**
* @brief Tell controller to emit START.
*
* @param base Pointer to controller registers.
* @param addr Target address.
* @param is_i2c True if this is I2C transactions, false if I3C.
* @param is_read True if this is a read transaction, false if write.
* @param read_sz Number of bytes to read if @p is_read is true.
*
* @return 0 if successful, or negative if error.
*/
static int mcux_i3c_request_emit_start(I3C_Type *base, uint8_t addr, bool is_i2c,
bool is_read, size_t read_sz)
{
uint32_t mctrl;
int ret = 0;
mctrl = is_i2c ? I3C_MCTRL_TYPE_I2C : I3C_MCTRL_TYPE_I3C;
mctrl |= I3C_MCTRL_IBIRESP_NACK;
if (is_read) {
mctrl |= I3C_MCTRL_DIR_READ;
/* How many bytes to read */
mctrl |= I3C_MCTRL_RDTERM(read_sz);
} else {
mctrl |= I3C_MCTRL_DIR_WRITE;
}
mctrl |= I3C_MCTRL_REQUEST_EMIT_START_ADDR | I3C_MCTRL_ADDR(addr);
base->MCTRL = mctrl;
/* Wait for controller to say the operation is done */
ret = mcux_i3c_status_wait_clear_timeout(base, I3C_MSTATUS_MCTRLDONE_MASK,
0, 10, 1000);
if (ret == 0) {
/* Check for NACK */
if (mcux_i3c_error_is_nack(base)) {
ret = -ENODEV;
}
}
return ret;
}
/**
* @brief Tell controller to emit STOP.
*
* This emits STOP when controller is in NORMACT state as this is
* the only valid state where STOP can be emitted. This also waits
* for the controller to get out of NORMACT before returning.
*
* @param base Pointer to controller registers.
* @param wait_stop True if need to wait for controller to be
* no longer in NORMACT.
*/
static inline void mcux_i3c_request_emit_stop(struct mcux_i3c_data *dev_data,
I3C_Type *base, bool wait_stop)
{
/* Make sure we are in a state where we can emit STOP */
if (mcux_i3c_state_get(base) == I3C_MSTATUS_STATE_NORMACT) {
reg32_update(&base->MCTRL,
I3C_MCTRL_REQUEST_MASK | I3C_MCTRL_DIR_MASK | I3C_MCTRL_RDTERM_MASK,
I3C_MCTRL_REQUEST_EMIT_STOP);
}
/*
* EMIT_STOP request doesn't result in MCTRLDONE being cleared
* so don't wait for it.
*/
if (wait_stop) {
/*
* Note that we don't exactly wait for I3C_MSTATUS_STATE_IDLE.
* If there is an incoming IBI, it will get stuck forever
* as state would be I3C_MSTATUS_STATE_SLVREQ.
*/
while (reg32_test_match(&base->MSTATUS, I3C_MSTATUS_STATE_MASK,
I3C_MSTATUS_STATE_NORMACT)) {
if (mcux_i3c_has_error(base)) {
/*
* Bail out if there is any error so
* we won't loop forever.
*/
return;
}
k_busy_wait(10);
};
}
/* Release any threads that might have been blocked waiting for IDLE */
k_condvar_broadcast(&dev_data->condvar);
}
/**
* @brief Tell controller to NACK the incoming IBI.
*
* @param base Pointer to controller registers.
*/
static inline void mcux_i3c_ibi_respond_nack(I3C_Type *base)
{
reg32_update(&base->MCTRL,
I3C_MCTRL_REQUEST_MASK | I3C_MCTRL_IBIRESP_MASK,
I3C_MCTRL_REQUEST_IBI_ACK_NACK | I3C_MCTRL_IBIRESP_NACK);
mcux_i3c_status_wait_clear(base, I3C_MSTATUS_MCTRLDONE_MASK);
}
/**
* @brief Tell controller to ACK the incoming IBI.
*
* @param base Pointer to controller registers.
*/
static inline void mcux_i3c_ibi_respond_ack(I3C_Type *base)
{
reg32_update(&base->MCTRL,
I3C_MCTRL_REQUEST_MASK | I3C_MCTRL_IBIRESP_MASK,
I3C_MCTRL_REQUEST_IBI_ACK_NACK | I3C_MCTRL_IBIRESP_ACK);
mcux_i3c_status_wait_clear(base, I3C_MSTATUS_MCTRLDONE_MASK);
}
/**
* @brief Get the number of bytes in RX FIFO.
*
* This returns the number of bytes in RX FIFO which
* can be read.
*
* @param base Pointer to controller registers.
*
* @return Number of bytes in RX FIFO.
*/
static inline int mcux_i3c_fifo_rx_count_get(I3C_Type *base)
{
uint32_t mdatactrl = base->MDATACTRL;
return (int)((mdatactrl & I3C_MDATACTRL_RXCOUNT_MASK) >> I3C_MDATACTRL_RXCOUNT_SHIFT);
}
/**
* @brief Tell controller to flush both TX and RX FIFOs.
*
* @param base Pointer to controller registers.
*/
static inline void mcux_i3c_fifo_flush(I3C_Type *base)
{
base->MDATACTRL = I3C_MDATACTRL_FLUSHFB_MASK | I3C_MDATACTRL_FLUSHTB_MASK;
}
/**
* @brief Prepare the controller for transfers.
*
* This is simply a wrapper to clear out status bits,
* and error bits. Also this tells the controller to
* flush both TX and RX FIFOs.
*
* @param base Pointer to controller registers.
*/
static inline void mcux_i3c_xfer_reset(I3C_Type *base)
{
mcux_i3c_status_clear_all(base);
mcux_i3c_errwarn_clear_all_nowait(base);
mcux_i3c_fifo_flush(base);
}
/**
* @brief Drain RX FIFO.
*
* @param dev Pointer to controller device driver instance.
*/
static void mcux_i3c_fifo_rx_drain(const struct device *dev)
{
const struct mcux_i3c_config *config = dev->config;
I3C_Type *base = config->base;
uint8_t buf;
/* Read from FIFO as long as RXPEND is set. */
while (mcux_i3c_status_is_set(base, I3C_MSTATUS_RXPEND_MASK)) {
buf = base->MRDATAB;
}
}
/**
* @brief Find a registered I3C target device.
*
* This returns the I3C device descriptor of the I3C device
* matching the incoming @p id.
*
* @param dev Pointer to controller device driver instance.
* @param id Pointer to I3C device ID.
*
* @return @see i3c_device_find.
*/
static
struct i3c_device_desc *mcux_i3c_device_find(const struct device *dev,
const struct i3c_device_id *id)
{
const struct mcux_i3c_config *config = dev->config;
return i3c_dev_list_find(&config->common.dev_list, id);
}
/**
* @brief Perform bus recovery.
*
* @param dev Pointer to controller device driver instance.
*/
static int mcux_i3c_recover_bus(const struct device *dev)
{
const struct mcux_i3c_config *config = dev->config;
I3C_Type *base = config->base;
int ret = 0;
/*
* If the controller is in NORMACT state, tells it to emit STOP
* so it can return to IDLE, or is ready to clear any pending
* target initiated IBIs.
*/
if (mcux_i3c_state_get(base) == I3C_MSTATUS_STATE_NORMACT) {
mcux_i3c_request_emit_stop(dev->data, base, true);
};
/* Exhaust all target initiated IBI */
while (mcux_i3c_status_is_set(base, I3C_MSTATUS_SLVSTART_MASK)) {
/* Tell the controller to perform auto IBI. */
mcux_i3c_request_auto_ibi(base);
if (mcux_i3c_status_wait_clear_timeout(base, I3C_MSTATUS_COMPLETE_MASK,
0, 10, 1000) == -ETIMEDOUT) {
break;
}
/* Once auto IBI is done, discard bytes in FIFO. */
mcux_i3c_fifo_rx_drain(dev);
/*
* There might be other IBIs waiting.
* So pause a bit to let other targets initiates
* their IBIs.
*/
k_busy_wait(100);
}
if (reg32_poll_timeout(&base->MSTATUS, I3C_MSTATUS_STATE_MASK,
I3C_MSTATUS_STATE_IDLE, 0, 10, 1000) == -ETIMEDOUT) {
ret = -EBUSY;
}
return ret;
}
/**
* @brief Perform one read transaction.
*
* This reads from RX FIFO until COMPLETE bit is set in MSTATUS
* or time out.
*
* @param base Pointer to controller registers.
* @param buf Buffer to store data.
* @param buf_sz Buffer size in bytes.
*
* @return Number of bytes read, or negative if error.
*/
static int mcux_i3c_do_one_xfer_read(I3C_Type *base, uint8_t *buf, uint8_t buf_sz, bool ibi)
{
int ret = 0;
int offset = 0;
while (offset < buf_sz) {
/*
* Transfer data from FIFO into buffer. Read
* in a tight loop to reduce chance of losing
* FIFO data when the i3c speed is high.
*/
while (offset < buf_sz) {
if (mcux_i3c_fifo_rx_count_get(base) == 0) {
break;
}
buf[offset++] = (uint8_t)base->MRDATAB;
}
/*
* If controller says timed out, we abort the transaction.
*/
if (mcux_i3c_has_error(base)) {
if (mcux_i3c_error_is_timeout(base)) {
ret = -ETIMEDOUT;
}
/* clear error */
base->MERRWARN = base->MERRWARN;
/* for ibi, ignore timeout err if any bytes were
* read, since the code doesn't know how many
* bytes will be sent by device. for regular
* application read request, return err always.
*/
if ((ret == -ETIMEDOUT) && ibi && offset) {
break;
} else {
if (ret == -ETIMEDOUT) {
LOG_ERR("Timeout error");
}
goto one_xfer_read_out;
}
}
}
ret = offset;
one_xfer_read_out:
return ret;
}
/**
* @brief Perform one write transaction.
*
* This writes all data in @p buf to TX FIFO or time out
* waiting for FIFO spaces.
*
* @param base Pointer to controller registers.
* @param buf Buffer containing data to be sent.
* @param buf_sz Number of bytes in @p buf to send.
* @param no_ending True if not to signal end of write message.
*
* @return Number of bytes written, or negative if error.
*/
static int mcux_i3c_do_one_xfer_write(I3C_Type *base, uint8_t *buf, uint8_t buf_sz, bool no_ending)
{
int offset = 0;
int remaining = buf_sz;
int ret = 0;
while (remaining > 0) {
ret = reg32_poll_timeout(&base->MDATACTRL, I3C_MDATACTRL_TXFULL_MASK, 0,
0, 10, 1000);
if (ret == -ETIMEDOUT) {
goto one_xfer_write_out;
}
if ((remaining > 1) || no_ending) {
base->MWDATAB = (uint32_t)buf[offset];
} else {
base->MWDATABE = (uint32_t)buf[offset];
}
offset += 1;
remaining -= 1;
}
ret = offset;
one_xfer_write_out:
return ret;
}
/**
* @brief Perform one transfer transaction.
*
* @param base Pointer to controller registers.
* @param data Pointer to controller device instance data.
* @param addr Target address.
* @param is_i2c True if this is I2C transactions, false if I3C.
* @param buf Buffer for data to be sent or received.
* @param buf_sz Buffer size in bytes.
* @param is_read True if this is a read transaction, false if write.
* @param emit_start True if START is needed before read/write.
* @param emit_stop True if STOP is needed after read/write.
* @param no_ending True if not to signal end of write message.
*
* @return Number of bytes read/written, or negative if error.
*/
static int mcux_i3c_do_one_xfer(I3C_Type *base, struct mcux_i3c_data *data,
uint8_t addr, bool is_i2c,
uint8_t *buf, size_t buf_sz,
bool is_read, bool emit_start, bool emit_stop,
bool no_ending)
{
int ret = 0;
mcux_i3c_status_clear_all(base);
mcux_i3c_errwarn_clear_all_nowait(base);
/* Emit START if so desired */
if (emit_start) {
ret = mcux_i3c_request_emit_start(base, addr, is_i2c, is_read, buf_sz);
if (ret != 0) {
emit_stop = true;
goto out_one_xfer;
}
}
if ((buf == NULL) || (buf_sz == 0)) {
goto out_one_xfer;
}
if (is_read) {
ret = mcux_i3c_do_one_xfer_read(base, buf, buf_sz, false);
} else {
ret = mcux_i3c_do_one_xfer_write(base, buf, buf_sz, no_ending);
}
if (ret < 0) {
goto out_one_xfer;
}
if (is_read || !no_ending) {
/* Wait for controller to say the operation is done */
ret = mcux_i3c_status_wait_clear_timeout(base, I3C_MSTATUS_COMPLETE_MASK,
0, 10, 1000);
if (ret != 0) {
LOG_DBG("%s: timed out addr 0x%02x, buf_sz %u",
__func__, addr, buf_sz);
emit_stop = true;
goto out_one_xfer;
}
}
if (mcux_i3c_has_error(base)) {
ret = -EIO;
}
out_one_xfer:
if (emit_stop) {
mcux_i3c_request_emit_stop(data, base, true);
}
return ret;
}
/**
* @brief Transfer messages in I3C mode.
*
* @see i3c_transfer
*
* @param dev Pointer to device driver instance.
* @param target Pointer to target device descriptor.
* @param msgs Pointer to I3C messages.
* @param num_msgs Number of messages to transfers.
*
* @return @see i3c_transfer
*/
static int mcux_i3c_transfer(const struct device *dev,
struct i3c_device_desc *target,
struct i3c_msg *msgs,
uint8_t num_msgs)
{
const struct mcux_i3c_config *config = dev->config;
struct mcux_i3c_data *dev_data = dev->data;
I3C_Type *base = config->base;
int ret;
bool send_broadcast = true;
if (target->dynamic_addr == 0U) {
ret = -EINVAL;
goto out_xfer_i3c;
}
k_mutex_lock(&dev_data->lock, K_FOREVER);
mcux_i3c_wait_idle(dev_data, base);
mcux_i3c_xfer_reset(base);
/* Iterate over all the messages */
for (int i = 0; i < num_msgs; i++) {
bool is_read = (msgs[i].flags & I3C_MSG_RW_MASK) == I3C_MSG_READ;
bool no_ending = false;
/*
* Emit start if this is the first message or that
* the RESTART flag is set in message.
*/
bool emit_start = (i == 0) ||
((msgs[i].flags & I3C_MSG_RESTART) == I3C_MSG_RESTART);
bool emit_stop = (msgs[i].flags & I3C_MSG_STOP) == I3C_MSG_STOP;
/*
* The controller requires special treatment of last byte of
* a write message. Since the API permits having a bunch of
* write messages without RESTART in between, this is just some
* logic to determine whether to treat the last byte of this
* message to be the last byte of a series of write mssages.
* If not, tell the write function not to treat it that way.
*/
if (!is_read && !emit_stop && ((i + 1) != num_msgs)) {
bool next_is_write =
(msgs[i + 1].flags & I3C_MSG_RW_MASK) == I3C_MSG_WRITE;
bool next_is_restart =
((msgs[i + 1].flags & I3C_MSG_RESTART) == I3C_MSG_RESTART);
if (next_is_write && !next_is_restart) {
no_ending = true;
}
}
/*
* Send broadcast header on first transfer or after a STOP,
* unless flag is set not to.
*/
if (!(msgs[i].flags & I3C_MSG_NBCH) && (send_broadcast)) {
while (1) {
ret = mcux_i3c_request_emit_start(base, I3C_BROADCAST_ADDR,
false, false, 0);
if (ret == -ENODEV) {
LOG_WRN("emit start of broadcast addr got NACK, maybe IBI");
/* wait for idle then try again */
mcux_i3c_wait_idle(dev_data, base);
continue;
}
if (ret < 0) {
LOG_ERR("emit start of broadcast addr failed, error (%d)",
ret);
goto out_xfer_i3c_stop_unlock;
}
break;
}
send_broadcast = false;
}
ret = mcux_i3c_do_one_xfer(base, dev_data, target->dynamic_addr, false,
msgs[i].buf, msgs[i].len,
is_read, emit_start, emit_stop, no_ending);
if (ret < 0) {
goto out_xfer_i3c_stop_unlock;
}
/* write back the total number of bytes transferred */
msgs[i].num_xfer = ret;
if (emit_stop) {
/* After a STOP, send broadcast header before next msg */
send_broadcast = true;
}
}
ret = 0;
out_xfer_i3c_stop_unlock:
mcux_i3c_request_emit_stop(dev_data, base, true);
mcux_i3c_errwarn_clear_all_nowait(base);
mcux_i3c_status_clear_all(base);
k_mutex_unlock(&dev_data->lock);
out_xfer_i3c:
return ret;
}
/**
* @brief Perform Dynamic Address Assignment.
*
* @see i3c_do_daa
*
* @param dev Pointer to controller device driver instance.
*
* @return @see i3c_do_daa
*/
static int mcux_i3c_do_daa(const struct device *dev)
{
const struct mcux_i3c_config *config = dev->config;
struct mcux_i3c_data *data = dev->data;
I3C_Type *base = config->base;
int ret = 0;
uint8_t rx_buf[8] = {0xFFU, 0xFFU, 0xFFU, 0xFFU, 0xFFU, 0xFFU, 0xFFU, 0xFFU};
size_t rx_count;
uint8_t rx_size = 0;
uint32_t intmask;
k_mutex_lock(&data->lock, K_FOREVER);
ret = mcux_i3c_state_wait_timeout(base, I3C_MSTATUS_STATE_IDLE, 0, 100, 100000);
if (ret == -ETIMEDOUT) {
goto out_daa_unlock;
}
LOG_DBG("DAA: ENTDAA");
/* Disable I3C IRQ sources while we configure stuff. */
intmask = mcux_i3c_interrupt_disable(base);
mcux_i3c_xfer_reset(base);
/* Emit process DAA */
mcux_i3c_request_daa(base);
/* Loop until no more responses from devices */
do {
/* Loop to grab data from devices (Provisioned ID, BCR and DCR) */
do {
if (mcux_i3c_has_error(base)) {
LOG_ERR("DAA recv error");
ret = -EIO;
goto out_daa;
}
rx_count = mcux_i3c_fifo_rx_count_get(base);
while (mcux_i3c_status_is_set(base, I3C_MSTATUS_RXPEND_MASK) &&
(rx_count != 0U)) {
rx_buf[rx_size] = (uint8_t)(base->MRDATAB &
I3C_MRDATAB_VALUE_MASK);
rx_size++;
rx_count--;
}
} while (!mcux_i3c_status_is_set(base, I3C_MSTATUS_MCTRLDONE_MASK));
mcux_i3c_status_clear(base, I3C_MSTATUS_MCTRLDONE_MASK);
/* Figure out what address to assign to device */
if ((mcux_i3c_state_get(base) == I3C_MSTATUS_STATE_DAA) &&
(mcux_i3c_status_is_set(base, I3C_MSTATUS_BETWEEN_MASK))) {
struct i3c_device_desc *target;
uint16_t vendor_id;
uint32_t part_no;
uint64_t pid;
uint8_t dyn_addr;
rx_size = 0;
/* Vendor ID portion of Provisioned ID */
vendor_id = (((uint16_t)rx_buf[0] << 8U) | (uint16_t)rx_buf[1]) &
0xFFFEU;
/* Part Number portion of Provisioned ID */
part_no = (uint32_t)rx_buf[2] << 24U | (uint32_t)rx_buf[3] << 16U |
(uint32_t)rx_buf[4] << 8U | (uint32_t)rx_buf[5];
/* ... and combine into one Provisioned ID */
pid = (uint64_t)vendor_id << 32U | (uint64_t)part_no;
LOG_DBG("DAA: Rcvd PID 0x%04x%08x", vendor_id, part_no);
ret = i3c_dev_list_daa_addr_helper(&data->common.attached_dev.addr_slots,
&config->common.dev_list, pid,
false, false,
&target, &dyn_addr);
if (ret != 0) {
goto out_daa;
}
/* Update target descriptor */
target->dynamic_addr = dyn_addr;
target->bcr = rx_buf[6];
target->dcr = rx_buf[7];
/* Mark the address as I3C device */
i3c_addr_slots_mark_i3c(&data->common.attached_dev.addr_slots, dyn_addr);
/*
* If the device has static address, after address assignment,
* the device will not respond to the static address anymore.
* So free the static one from address slots if different from
* newly assigned one.
*/
if ((target->static_addr != 0U) && (dyn_addr != target->static_addr)) {
i3c_addr_slots_mark_free(&data->common.attached_dev.addr_slots,
dyn_addr);
}
/* Emit process DAA again to send the address to the device */
base->MWDATAB = dyn_addr;
mcux_i3c_request_daa(base);
LOG_DBG("PID 0x%04x%08x assigned dynamic address 0x%02x",
vendor_id, part_no, dyn_addr);
}
} while (!mcux_i3c_status_is_set(base, I3C_MSTATUS_COMPLETE_MASK));
out_daa:
/* Clear all flags. */
mcux_i3c_errwarn_clear_all_nowait(base);
mcux_i3c_status_clear_all(base);
/* Re-Enable I3C IRQ sources. */
mcux_i3c_interrupt_enable(base, intmask);
out_daa_unlock:
k_mutex_unlock(&data->lock);
return ret;
}
/**
* @brief Send Common Command Code (CCC).
*
* @see i3c_do_ccc
*
* @param dev Pointer to controller device driver instance.
* @param payload Pointer to CCC payload.
*
* @return @see i3c_do_ccc
*/
static int mcux_i3c_do_ccc(const struct device *dev,
struct i3c_ccc_payload *payload)
{
const struct mcux_i3c_config *config = dev->config;
struct mcux_i3c_data *data = dev->data;
I3C_Type *base = config->base;
int ret = 0;
if (payload == NULL) {
return -EINVAL;
}
if (config->common.dev_list.num_i3c == 0) {
/*
* No i3c devices in dev tree. Just return so
* we don't get errors doing cmds when there
* are no devices listening/responding.
*/
return 0;
}
k_mutex_lock(&data->lock, K_FOREVER);
mcux_i3c_xfer_reset(base);
LOG_DBG("CCC[0x%02x]", payload->ccc.id);
/* Emit START */
ret = mcux_i3c_request_emit_start(base, I3C_BROADCAST_ADDR, false, false, 0);
if (ret < 0) {
LOG_ERR("CCC[0x%02x] %s START error (%d)",
payload->ccc.id,
i3c_ccc_is_payload_broadcast(payload) ? "broadcast" : "direct",
ret);
goto out_ccc_stop;
}
/* Write the CCC code */
mcux_i3c_status_clear_all(base);
mcux_i3c_errwarn_clear_all_nowait(base);
ret = mcux_i3c_do_one_xfer_write(base, &payload->ccc.id, 1,
payload->ccc.data_len > 0);
if (ret < 0) {
LOG_ERR("CCC[0x%02x] %s command error (%d)",
payload->ccc.id,
i3c_ccc_is_payload_broadcast(payload) ? "broadcast" : "direct",
ret);
goto out_ccc_stop;
}
/* Write additional data for CCC if needed */
if (payload->ccc.data_len > 0) {
mcux_i3c_status_clear_all(base);
mcux_i3c_errwarn_clear_all_nowait(base);
ret = mcux_i3c_do_one_xfer_write(base, payload->ccc.data,
payload->ccc.data_len, false);
if (ret < 0) {
LOG_ERR("CCC[0x%02x] %s command payload error (%d)",
payload->ccc.id,
i3c_ccc_is_payload_broadcast(payload) ? "broadcast" : "direct",
ret);
goto out_ccc_stop;
}
/* write back the total number of bytes transferred */
payload->ccc.num_xfer = ret;
}
/* Wait for controller to say the operation is done */
ret = mcux_i3c_status_wait_clear_timeout(base, I3C_MSTATUS_COMPLETE_MASK, 0, 10, 1000);
if (ret != 0) {
goto out_ccc_stop;
}
if (!i3c_ccc_is_payload_broadcast(payload)) {
/*
* If there are payload(s) for each target,
* RESTART and then send payload for each target.
*/
for (int idx = 0; idx < payload->targets.num_targets; idx++) {
struct i3c_ccc_target_payload *tgt_payload =
&payload->targets.payloads[idx];
bool is_read = tgt_payload->rnw == 1U;
bool emit_start = idx == 0;
ret = mcux_i3c_do_one_xfer(base, data,
tgt_payload->addr, false,
tgt_payload->data,
tgt_payload->data_len,
is_read, emit_start, false, false);
if (ret < 0) {
LOG_ERR("CCC[0x%02x] target payload error (%d)",
payload->ccc.id, ret);
goto out_ccc_stop;
}
/* write back the total number of bytes transferred */
tgt_payload->num_xfer = ret;
}
}
out_ccc_stop:
mcux_i3c_request_emit_stop(data, base, true);
if (ret > 0) {
ret = 0;
}
k_mutex_unlock(&data->lock);
return ret;
}
#ifdef CONFIG_I3C_USE_IBI
/**
* @brief Callback to service target initiated IBIs.
*
* @param work Pointer to k_work item.
*/
static void mcux_i3c_ibi_work(struct k_work *work)
{
uint8_t payload[CONFIG_I3C_IBI_MAX_PAYLOAD_SIZE];
size_t payload_sz = 0;
struct i3c_ibi_work *i3c_ibi_work = CONTAINER_OF(work, struct i3c_ibi_work, work);
const struct device *dev = i3c_ibi_work->controller;
const struct mcux_i3c_config *config = dev->config;
struct mcux_i3c_data *data = dev->data;
struct i3c_dev_attached_list *dev_list = &data->common.attached_dev;
I3C_Type *base = config->base;
struct i3c_device_desc *target = NULL;
uint32_t mstatus, ibitype, ibiaddr;
int ret;
k_mutex_lock(&data->lock, K_FOREVER);
if (mcux_i3c_state_get(base) != I3C_MSTATUS_STATE_SLVREQ) {
LOG_DBG("IBI work %p running not because of IBI", work);
LOG_DBG("MSTATUS 0x%08x MERRWARN 0x%08x",
base->MSTATUS, base->MERRWARN);
mcux_i3c_request_emit_stop(data, base, true);
goto out_ibi_work;
};
/* Use auto IBI to service the IBI */
mcux_i3c_request_auto_ibi(base);
mstatus = sys_read32((mem_addr_t)&base->MSTATUS);
ibiaddr = (mstatus & I3C_MSTATUS_IBIADDR_MASK) >> I3C_MSTATUS_IBIADDR_SHIFT;
/*
* Note that the I3C_MSTATUS_IBI_TYPE_* are not shifted right.
* So no need to shift here.
*/
ibitype = (mstatus & I3C_MSTATUS_IBITYPE_MASK);
/*
* Wait for COMPLETE bit to be set to indicate auto IBI
* has finished for hot-join and controller role request.
* For target interrupts, the IBI payload may be longer
* than the RX FIFO so we won't get the COMPLETE bit set
* at the first round of data read. So checking of
* COMPLETE bit is deferred to the reading.
*/
switch (ibitype) {
case I3C_MSTATUS_IBITYPE_HJ:
__fallthrough;
case I3C_MSTATUS_IBITYPE_MR:
if (mcux_i3c_status_wait_timeout(base, I3C_MSTATUS_COMPLETE_MASK,
0, 10, 1000) == -ETIMEDOUT) {
LOG_ERR("Timeout waiting for COMPLETE");
mcux_i3c_request_emit_stop(data, base, true);
goto out_ibi_work;
}
break;
default:
break;
};
switch (ibitype) {
case I3C_MSTATUS_IBITYPE_IBI:
target = i3c_dev_list_i3c_addr_find(dev_list, (uint8_t)ibiaddr);
if (target != NULL) {
ret = mcux_i3c_do_one_xfer_read(base, &payload[0],
sizeof(payload), true);
if (ret >= 0) {
payload_sz = (size_t)ret;
} else {
LOG_ERR("Error reading IBI payload");
mcux_i3c_request_emit_stop(data, base, true);
goto out_ibi_work;
}
} else {
LOG_ERR("IBI from unknown device addr 0x%x", ibiaddr);
/* NACK IBI coming from unknown device */
mcux_i3c_ibi_respond_nack(base);
}
break;
case I3C_MSTATUS_IBITYPE_HJ:
mcux_i3c_ibi_respond_ack(base);
break;
case I3C_MSTATUS_IBITYPE_MR:
LOG_DBG("Controller role handoff not supported");
mcux_i3c_ibi_respond_nack(base);
break;
default:
break;
}
if (mcux_i3c_has_error(base)) {
/*
* If the controller detects any errors, simply
* emit a STOP to abort the IBI. The target will
* raise IBI again if so desired.
*/
mcux_i3c_request_emit_stop(data, base, true);
goto out_ibi_work;
}
switch (ibitype) {
case I3C_MSTATUS_IBITYPE_IBI:
if (target != NULL) {
if (i3c_ibi_work_enqueue_target_irq(target,
&payload[0], payload_sz) != 0) {
LOG_ERR("Error enqueue IBI IRQ work");
}
}
/* Finishing the IBI transaction */
mcux_i3c_request_emit_stop(data, base, true);
break;
case I3C_MSTATUS_IBITYPE_HJ:
if (i3c_ibi_work_enqueue_hotjoin(dev) != 0) {
LOG_ERR("Error enqueue IBI HJ work");
}
break;
case I3C_MSTATUS_IBITYPE_MR:
break;
default:
break;
}
out_ibi_work:
k_mutex_unlock(&data->lock);
/* Re-enable target initiated IBI interrupt. */
base->MINTSET = I3C_MINTSET_SLVSTART_MASK;
}
static void mcux_i3c_ibi_rules_setup(struct mcux_i3c_data *data,
I3C_Type *base)
{
uint32_t ibi_rules;
int idx;
ibi_rules = 0;
for (idx = 0; idx < ARRAY_SIZE(data->ibi.addr); idx++) {
uint32_t addr_6bit;
/* Extract the lower 6-bit of target address */
addr_6bit = (uint32_t)data->ibi.addr[idx] & I3C_MIBIRULES_ADDR0_MASK;
/* Shift into correct place */
addr_6bit <<= idx * I3C_MIBIRULES_ADDR1_SHIFT;
/* Put into the temporary IBI Rules register */
ibi_rules |= addr_6bit;
}
if (!data->ibi.msb) {
/* The MSB0 field is 1 if MSB is 0 */
ibi_rules |= I3C_MIBIRULES_MSB0_MASK;
}
if (!data->ibi.has_mandatory_byte) {
/* The NOBYTE field is 1 if there is no mandatory byte */
ibi_rules |= I3C_MIBIRULES_NOBYTE_MASK;
}
/* Update the register */
base->MIBIRULES = ibi_rules;
LOG_DBG("MIBIRULES 0x%08x", ibi_rules);
}
int mcux_i3c_ibi_enable(const struct device *dev,
struct i3c_device_desc *target)
{
const struct mcux_i3c_config *config = dev->config;
struct mcux_i3c_data *data = dev->data;
I3C_Type *base = config->base;
struct i3c_ccc_events i3c_events;
uint8_t idx;
bool msb, has_mandatory_byte;
int ret = 0;
if (!i3c_device_is_ibi_capable(target)) {
ret = -EINVAL;
goto out1;
}
if (data->ibi.num_addr >= ARRAY_SIZE(data->ibi.addr)) {
/* No more free entries in the IBI Rules table */
ret = -ENOMEM;
goto out1;
}
/* Check for duplicate */
for (idx = 0; idx < ARRAY_SIZE(data->ibi.addr); idx++) {
if (data->ibi.addr[idx] == target->dynamic_addr) {
ret = -EINVAL;
goto out1;
}
}
/* Disable controller interrupt while we configure IBI rules. */
base->MINTCLR = I3C_MINTCLR_SLVSTART_MASK;
LOG_DBG("IBI enabling for 0x%02x (BCR 0x%02x)",
target->dynamic_addr, target->bcr);
msb = (target->dynamic_addr & BIT(6)) == BIT(6);
has_mandatory_byte = i3c_ibi_has_payload(target);
/*
* If there are already addresses in the table, we must
* check if the incoming entry is compatible with
* the existing ones.
*/
if (data->ibi.num_addr > 0) {
/*
* 1. All devices in the table must all use mandatory
* bytes, or do not.
*
* 2. Each address in entry only captures the lowest 6-bit.
* The MSB (7th bit) is captured separated in another bit
* in the register. So all addresses must have the same MSB.
*/
if (has_mandatory_byte != data->ibi.has_mandatory_byte) {
LOG_ERR("New IBI does not have same mandatory byte requirement"
" as previous IBI");
ret = -EINVAL;
goto out;
}
if (msb != data->ibi.msb) {
LOG_ERR("New IBI does not have same msb as previous IBI");
ret = -EINVAL;
goto out;
}
/* Find an empty address slot */
for (idx = 0; idx < ARRAY_SIZE(data->ibi.addr); idx++) {
if (data->ibi.addr[idx] == 0U) {
break;
}
}
if (idx >= ARRAY_SIZE(data->ibi.addr)) {
LOG_ERR("Cannot support more IBIs");
ret = -ENOTSUP;
goto out;
}
} else {
/*
* If the incoming address is the first in the table,
* it dictates future compatibilities.
*/
data->ibi.has_mandatory_byte = has_mandatory_byte;
data->ibi.msb = msb;
idx = 0;
}
data->ibi.addr[idx] = target->dynamic_addr;
data->ibi.num_addr += 1U;
mcux_i3c_ibi_rules_setup(data, base);
/* Tell target to enable IBI */
i3c_events.events = I3C_CCC_EVT_INTR;
ret = i3c_ccc_do_events_set(target, true, &i3c_events);
if (ret != 0) {
LOG_ERR("Error sending IBI ENEC for 0x%02x (%d)",
target->dynamic_addr, ret);
}
out:
if (data->ibi.num_addr > 0U) {
/*
* Enable controller to raise interrupt when a target
* initiates IBI.
*/
base->MINTSET = I3C_MINTSET_SLVSTART_MASK;
}
out1:
return ret;
}
int mcux_i3c_ibi_disable(const struct device *dev,
struct i3c_device_desc *target)
{
const struct mcux_i3c_config *config = dev->config;
struct mcux_i3c_data *data = dev->data;
I3C_Type *base = config->base;
struct i3c_ccc_events i3c_events;
int ret = 0;
int idx;
if (!i3c_device_is_ibi_capable(target)) {
ret = -EINVAL;
goto out;
}
for (idx = 0; idx < ARRAY_SIZE(data->ibi.addr); idx++) {
if (target->dynamic_addr == data->ibi.addr[idx]) {
break;
}
}
if (idx == ARRAY_SIZE(data->ibi.addr)) {
/* Target is not in list of registered addresses. */
ret = -ENODEV;
goto out;
}
/* Disable controller interrupt while we configure IBI rules. */
base->MINTCLR = I3C_MINTCLR_SLVSTART_MASK;
data->ibi.addr[idx] = 0U;
data->ibi.num_addr -= 1U;
/* Tell target to disable IBI */
i3c_events.events = I3C_CCC_EVT_INTR;
ret = i3c_ccc_do_events_set(target, false, &i3c_events);
if (ret != 0) {
LOG_ERR("Error sending IBI DISEC for 0x%02x (%d)",
target->dynamic_addr, ret);
}
mcux_i3c_ibi_rules_setup(data, base);
if (data->ibi.num_addr > 0U) {
/*
* Enable controller to raise interrupt when a target
* initiates IBI.
*/
base->MINTSET = I3C_MINTSET_SLVSTART_MASK;
}
out:
return ret;
}
#endif /* CONFIG_I3C_USE_IBI */
/**
* @brief Interrupt Service Routine
*
* Currently only services interrupts when any target initiates IBIs.
*
* @param dev Pointer to controller device driver instance.
*/
static void mcux_i3c_isr(const struct device *dev)
{
#ifdef CONFIG_I3C_USE_IBI
const struct mcux_i3c_config *config = dev->config;
I3C_Type *base = config->base;
/* Target initiated IBIs */
if (mcux_i3c_status_is_set(base, I3C_MSTATUS_SLVSTART_MASK)) {
int err;
/* Clear SLVSTART interrupt */
base->MSTATUS = I3C_MSTATUS_SLVSTART_MASK;
/*
* Disable further target initiated IBI interrupt
* while we try to service the current one.
*/
base->MINTCLR = I3C_MINTCLR_SLVSTART_MASK;
/*
* Handle IBI in workqueue.
*/
err = i3c_ibi_work_enqueue_cb(dev, mcux_i3c_ibi_work);
if (err) {
LOG_ERR("Error enqueuing ibi work, err %d", err);
base->MINTSET = I3C_MINTCLR_SLVSTART_MASK;
}
}
#else
ARG_UNUSED(dev);
#endif
}
/**
* @brief Configure I3C hardware.
*
* @param dev Pointer to controller device driver instance.
* @param type Type of configuration parameters being passed
* in @p config.
* @param config Pointer to the configuration parameters.
*
* @retval 0 If successful.
* @retval -EINVAL If invalid configure parameters.
* @retval -EIO General Input/Output errors.
* @retval -ENOSYS If not implemented.
*/
static int mcux_i3c_configure(const struct device *dev,
enum i3c_config_type type, void *config)
{
const struct mcux_i3c_config *dev_cfg = dev->config;
struct mcux_i3c_data *dev_data = dev->data;
I3C_Type *base = dev_cfg->base;
i3c_master_config_t master_config;
struct i3c_config_controller *ctrl_cfg = config;
uint32_t clock_freq;
int ret = 0;
if (type != I3C_CONFIG_CONTROLLER) {
ret = -EINVAL;
goto out_configure;
}
/*
* Check for valid configuration parameters.
*
* Currently, must be the primary controller.
*/
if ((ctrl_cfg->is_secondary) ||
(ctrl_cfg->scl.i2c == 0U) ||
(ctrl_cfg->scl.i3c == 0U)) {
ret = -EINVAL;
goto out_configure;
}
/* Get the clock frequency */
if (clock_control_get_rate(dev_cfg->clock_dev, dev_cfg->clock_subsys,
&clock_freq)) {
ret = -EINVAL;
goto out_configure;
}
/*
* Save requested config so next config_get() call returns the
* correct values.
*/
(void)memcpy(&dev_data->common.ctrl_config, ctrl_cfg, sizeof(*ctrl_cfg));
I3C_MasterGetDefaultConfig(&master_config);
master_config.baudRate_Hz.i2cBaud = ctrl_cfg->scl.i2c;
master_config.baudRate_Hz.i3cPushPullBaud = ctrl_cfg->scl.i3c;
master_config.enableOpenDrainHigh = dev_cfg->disable_open_drain_high_pp ? false : true;
if (dev_data->clocks.i3c_od_scl_hz) {
master_config.baudRate_Hz.i3cOpenDrainBaud = dev_data->clocks.i3c_od_scl_hz;
}
/* Initialize hardware */
I3C_MasterInit(base, &master_config, clock_freq);
out_configure:
return ret;
}
/**
* @brief Get configuration of the I3C hardware.
*
* This provides a way to get the current configuration of the I3C hardware.
*
* This can return cached config or probed hardware parameters, but it has to
* be up to date with current configuration.
*
* @param[in] dev Pointer to controller device driver instance.
* @param[in] type Type of configuration parameters being passed
* in @p config.
* @param[in,out] config Pointer to the configuration parameters.
*
* Note that if @p type is @c I3C_CONFIG_CUSTOM, @p config must contain
* the ID of the parameter to be retrieved.
*
* @retval 0 If successful.
* @retval -EIO General Input/Output errors.
* @retval -ENOSYS If not implemented.
*/
static int mcux_i3c_config_get(const struct device *dev,
enum i3c_config_type type, void *config)
{
struct mcux_i3c_data *data = dev->data;
int ret = 0;
if ((type != I3C_CONFIG_CONTROLLER) || (config == NULL)) {
ret = -EINVAL;
goto out_configure;
}
(void)memcpy(config, &data->common.ctrl_config, sizeof(data->common.ctrl_config));
out_configure:
return ret;
}
/**
* @brief Initialize the hardware.
*
* @param dev Pointer to controller device driver instance.
*/
static int mcux_i3c_init(const struct device *dev)
{
const struct mcux_i3c_config *config = dev->config;
struct mcux_i3c_data *data = dev->data;
I3C_Type *base = config->base;
struct i3c_config_controller *ctrl_config = &data->common.ctrl_config;
int ret = 0;
ret = i3c_addr_slots_init(dev);
if (ret != 0) {
goto err_out;
}
CLOCK_SetClkDiv(kCLOCK_DivI3cClk, data->clocks.clk_div_pp);
CLOCK_SetClkDiv(kCLOCK_DivI3cSlowClk, data->clocks.clk_div_od);
CLOCK_SetClkDiv(kCLOCK_DivI3cTcClk, data->clocks.clk_div_tc);
ret = pinctrl_apply_state(config->pincfg, PINCTRL_STATE_DEFAULT);
if (ret != 0) {
goto err_out;
}
k_mutex_init(&data->lock);
k_condvar_init(&data->condvar);
/* Currently can only act as primary controller. */
ctrl_config->is_secondary = false;
/* HDR mode not supported at the moment. */
ctrl_config->supported_hdr = 0U;
ret = mcux_i3c_configure(dev, I3C_CONFIG_CONTROLLER, ctrl_config);
if (ret != 0) {
ret = -EINVAL;
goto err_out;
}
/* Disable all interrupts */
base->MINTCLR = I3C_MINTCLR_SLVSTART_MASK |
I3C_MINTCLR_MCTRLDONE_MASK |
I3C_MINTCLR_COMPLETE_MASK |
I3C_MINTCLR_RXPEND_MASK |
I3C_MINTCLR_TXNOTFULL_MASK |
I3C_MINTCLR_IBIWON_MASK |
I3C_MINTCLR_ERRWARN_MASK |
I3C_MINTCLR_NOWMASTER_MASK;
/* Just in case the bus is not in idle. */
ret = mcux_i3c_recover_bus(dev);
if (ret != 0) {
ret = -EIO;
goto err_out;
}
/* Configure interrupt */
config->irq_config_func(dev);
/* Perform bus initialization */
ret = i3c_bus_init(dev, &config->common.dev_list);
err_out:
return ret;
}
static int mcux_i3c_i2c_api_configure(const struct device *dev, uint32_t dev_config)
{
return -ENOSYS;
}
static int mcux_i3c_i2c_api_transfer(const struct device *dev,
struct i2c_msg *msgs,
uint8_t num_msgs,
uint16_t addr)
{
const struct mcux_i3c_config *config = dev->config;
struct mcux_i3c_data *dev_data = dev->data;
I3C_Type *base = config->base;
int ret;
k_mutex_lock(&dev_data->lock, K_FOREVER);
mcux_i3c_wait_idle(dev_data, base);
mcux_i3c_xfer_reset(base);
/* Iterate over all the messages */
for (int i = 0; i < num_msgs; i++) {
bool is_read = (msgs[i].flags & I2C_MSG_RW_MASK) == I2C_MSG_READ;
bool no_ending = false;
/*
* Emit start if this is the first message or that
* the RESTART flag is set in message.
*/
bool emit_start = (i == 0) ||
((msgs[i].flags & I2C_MSG_RESTART) == I2C_MSG_RESTART);
bool emit_stop = (msgs[i].flags & I2C_MSG_STOP) == I2C_MSG_STOP;
/*
* The controller requires special treatment of last byte of
* a write message. Since the API permits having a bunch of
* write messages without RESTART in between, this is just some
* logic to determine whether to treat the last byte of this
* message to be the last byte of a series of write mssages.
* If not, tell the write function not to treat it that way.
*/
if (!is_read && !emit_stop && ((i + 1) != num_msgs)) {
bool next_is_write =
(msgs[i + 1].flags & I2C_MSG_RW_MASK) == I2C_MSG_WRITE;
bool next_is_restart =
((msgs[i + 1].flags & I2C_MSG_RESTART) == I2C_MSG_RESTART);
if (next_is_write && !next_is_restart) {
no_ending = true;
}
}
ret = mcux_i3c_do_one_xfer(base, dev_data, addr, true,
msgs[i].buf, msgs[i].len,
is_read, emit_start, emit_stop, no_ending);
if (ret < 0) {
goto out_xfer_i2c_stop_unlock;
}
}
ret = 0;
out_xfer_i2c_stop_unlock:
mcux_i3c_request_emit_stop(dev_data, base, true);
mcux_i3c_errwarn_clear_all_nowait(base);
mcux_i3c_status_clear_all(base);
k_mutex_unlock(&dev_data->lock);
return ret;
}
static const struct i3c_driver_api mcux_i3c_driver_api = {
.i2c_api.configure = mcux_i3c_i2c_api_configure,
.i2c_api.transfer = mcux_i3c_i2c_api_transfer,
.i2c_api.recover_bus = mcux_i3c_recover_bus,
.configure = mcux_i3c_configure,
.config_get = mcux_i3c_config_get,
.recover_bus = mcux_i3c_recover_bus,
.do_daa = mcux_i3c_do_daa,
.do_ccc = mcux_i3c_do_ccc,
.i3c_device_find = mcux_i3c_device_find,
.i3c_xfers = mcux_i3c_transfer,
#ifdef CONFIG_I3C_USE_IBI
.ibi_enable = mcux_i3c_ibi_enable,
.ibi_disable = mcux_i3c_ibi_disable,
#endif
};
#define I3C_MCUX_DEVICE(id) \
PINCTRL_DT_INST_DEFINE(id); \
static void mcux_i3c_config_func_##id(const struct device *dev); \
static struct i3c_device_desc mcux_i3c_device_array_##id[] = \
I3C_DEVICE_ARRAY_DT_INST(id); \
static struct i3c_i2c_device_desc mcux_i3c_i2c_device_array_##id[] = \
I3C_I2C_DEVICE_ARRAY_DT_INST(id); \
static const struct mcux_i3c_config mcux_i3c_config_##id = { \
.base = (I3C_Type *) DT_INST_REG_ADDR(id), \
.clock_dev = DEVICE_DT_GET(DT_INST_CLOCKS_CTLR(id)), \
.clock_subsys = \
(clock_control_subsys_t)DT_INST_CLOCKS_CELL(id, name), \
.irq_config_func = mcux_i3c_config_func_##id, \
.common.dev_list.i3c = mcux_i3c_device_array_##id, \
.common.dev_list.num_i3c = ARRAY_SIZE(mcux_i3c_device_array_##id), \
.common.dev_list.i2c = mcux_i3c_i2c_device_array_##id, \
.common.dev_list.num_i2c = ARRAY_SIZE(mcux_i3c_i2c_device_array_##id), \
.pincfg = PINCTRL_DT_INST_DEV_CONFIG_GET(id), \
.disable_open_drain_high_pp = \
DT_INST_PROP(id, disable_open_drain_high_pp), \
}; \
static struct mcux_i3c_data mcux_i3c_data_##id = { \
.clocks.i3c_od_scl_hz = DT_INST_PROP_OR(id, i3c_od_scl_hz, 0), \
.common.ctrl_config.scl.i3c = DT_INST_PROP_OR(id, i3c_scl_hz, 0), \
.common.ctrl_config.scl.i2c = DT_INST_PROP_OR(id, i2c_scl_hz, 0), \
.clocks.clk_div_pp = DT_INST_PROP(id, clk_divider), \
.clocks.clk_div_od = DT_INST_PROP(id, clk_divider_slow), \
.clocks.clk_div_tc = DT_INST_PROP(id, clk_divider_tc), \
}; \
DEVICE_DT_INST_DEFINE(id, \
mcux_i3c_init, \
NULL, \
&mcux_i3c_data_##id, \
&mcux_i3c_config_##id, \
POST_KERNEL, \
CONFIG_I3C_CONTROLLER_INIT_PRIORITY, \
&mcux_i3c_driver_api); \
static void mcux_i3c_config_func_##id(const struct device *dev) \
{ \
IRQ_CONNECT(DT_INST_IRQN(id), \
DT_INST_IRQ(id, priority), \
mcux_i3c_isr, \
DEVICE_DT_INST_GET(id), \
0); \
irq_enable(DT_INST_IRQN(id)); \
}; \
DT_INST_FOREACH_STATUS_OKAY(I3C_MCUX_DEVICE)
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