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drivers: i3c: cdns: add recovery api #97749

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drivers: i3c: cdns: add recovery api #97749

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37 changes: 37 additions & 0 deletions drivers/i3c/i3c_cdns.c
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Original file line number Diff line number Diff line change
Expand Up @@ -3415,6 +3415,39 @@ static int cdns_i3c_target_controller_handoff(const struct device *dev, bool acc
}
#endif
#ifdef CONFIG_I3C_CONTROLLER
/**
* @brief Recover the I3C bus. This only performs a fifo flush.
*
* @param dev Pointer to device driver instance.
*
* @return 0 if successful, errno otherwise.
*/
static int cdns_i3c_recover_bus(const struct device *dev)
{
const struct cdns_i3c_config *config = dev->config;
struct cdns_i3c_data *data = dev->data;

k_mutex_lock(&data->bus_lock, K_FOREVER);

/* Clear main enable bit to disable further transactions */
sys_write32(~CTRL_DEV_EN & sys_read32(config->base + CTRL), config->base + CTRL);

/**
* Flush all queues.
*/
sys_write32(FLUSH_RX_FIFO | FLUSH_TX_FIFO | FLUSH_CMD_FIFO | FLUSH_CMD_RESP,
config->base + FLUSH_CTRL);

/* Re-enable device */
sys_write32(CTRL_DEV_EN | sys_read32(config->base + CTRL), config->base + CTRL);

k_mutex_unlock(&data->bus_lock);

LOG_INF("%s: Bus recovery complete", dev->name);

return 0;
}

/**
* Determine I3C bus mode from the i2c devices on the bus
*
Expand Down Expand Up @@ -3743,6 +3776,7 @@ static DEVICE_API(i3c, api) = {
#ifdef CONFIG_I3C_CONTROLLER
.i2c_api.configure = cdns_i3c_i2c_api_configure,
.i2c_api.transfer = cdns_i3c_i2c_api_transfer,
.i2c_api.recover_bus = cdns_i3c_recover_bus,
#ifdef CONFIG_I2C_RTIO
.i2c_api.iodev_submit = i2c_iodev_submit_fallback,
#endif
Expand All @@ -3751,6 +3785,9 @@ static DEVICE_API(i3c, api) = {
.configure = cdns_i3c_configure,
.config_get = cdns_i3c_config_get,
#ifdef CONFIG_I3C_CONTROLLER

.recover_bus = cdns_i3c_recover_bus,

.attach_i3c_device = cdns_i3c_attach_device,
.reattach_i3c_device = cdns_i3c_reattach_device,
.detach_i3c_device = cdns_i3c_detach_device,
Expand Down