diff options
Diffstat (limited to 'kernel/drivers/net/ieee802154/dw3000_coex.h')
| -rw-r--r-- | kernel/drivers/net/ieee802154/dw3000_coex.h | 55 |
1 files changed, 35 insertions, 20 deletions
diff --git a/kernel/drivers/net/ieee802154/dw3000_coex.h b/kernel/drivers/net/ieee802154/dw3000_coex.h index 42e7288..2f39dc6 100644 --- a/kernel/drivers/net/ieee802154/dw3000_coex.h +++ b/kernel/drivers/net/ieee802154/dw3000_coex.h @@ -25,9 +25,6 @@ #include "dw3000.h" -#define COEX_TIME_US (dw->coex_delay_us) -#define COEX_MARGIN_US (dw->coex_margin_us) - static inline int dw3000_coex_stop(struct dw3000 *dw); /** @@ -45,13 +42,17 @@ static inline int dw3000_coex_stop(struct dw3000 *dw); */ static inline int dw3000_coex_gpio(struct dw3000 *dw, int state, int delay_us) { - int ret; + int rc; - ret = dw->chip_ops->coex_gpio(dw, state, delay_us); - if (!ret) + /* Use SPI in queuing mode */ + dw3000_spi_queue_start(dw); + rc = dw->chip_ops->coex_gpio(dw, state, delay_us); + if (rc) + return dw3000_spi_queue_reset(dw, rc); + rc = dw3000_spi_queue_flush(dw); + if (!rc) dw->coex_status = state; - - return ret; + return rc; } /** @@ -61,40 +62,54 @@ static inline int dw3000_coex_gpio(struct dw3000 *dw, int state, int delay_us) * @trx_date_dtu: pointer to tx/rx_date_dtu parameter to update * @cur_time_dtu: current device time in DTU * + * Calculate a timer delay in us and programme it to ensure the WiFi coex + * GPIO is asserted at least `coex_delay_us` before the next operation. + * + * This function also reset the GPIO immediatly if the calculated timer delay + * is more than `coex_interval_us`. + * * Return: 0 on success, else a negative error code. */ static inline int dw3000_coex_start(struct dw3000 *dw, bool *trx_delayed, u32 *trx_date_dtu, u32 cur_time_dtu) { int delay_us; + int timer_us = 0; if (dw->coex_gpio < 0) return 0; - delay_us = COEX_TIME_US + COEX_MARGIN_US; + /* Add a margin for required SPI transactions to the coex delay time + * to ensure GPIO change at right time. */ + delay_us = dw->coex_delay_us + dw->coex_margin_us; if (*trx_delayed == false) { - /* Change to delayed TX/RX with the configured delay */ + /* Change to delayed TX/RX with the minimum required delay */ *trx_date_dtu = cur_time_dtu + US_TO_DTU(delay_us); *trx_delayed = true; - /* Set gpio now */ - delay_us = 0; + /* Leave timer_us to 0 to set gpio now. */ } else { - /* Calculate when we need to toggle the gpio */ + /* Calculate timer duration to program. */ + /* V TX + * | time_difference_us | + * | margin | timer | delay | + * G + * + * timer = time_difference_us - (delay + margin) + */ int time_difference_dtu = *trx_date_dtu - cur_time_dtu; int time_difference_us = DTU_TO_US(time_difference_dtu); - if (time_difference_us <= delay_us) - delay_us = 0; - else - delay_us = time_difference_us - delay_us; + if (time_difference_us > delay_us) + timer_us = time_difference_us - delay_us; + /* else, too late for timer, set gpio now */ } - trace_dw3000_coex_gpio_start(dw, delay_us, dw->coex_status, + trace_dw3000_coex_gpio_start(dw, timer_us, dw->coex_status, dw->coex_interval_us); if (dw->coex_status) { - if (delay_us < dw->coex_interval_us) + if (timer_us < dw->coex_interval_us) return 0; /* Nothing more to do */ dw3000_coex_stop(dw); } /* Set coexistence gpio on chip */ - return dw3000_coex_gpio(dw, true, delay_us); + return dw3000_coex_gpio(dw, true, timer_us); } /** |