(Patches split per file for review, see cover letter for more information) Signed-off-by: Lachlan Hodges --- drivers/net/wireless/morsemicro/mm81x/ps.c | 239 +++++++++++++++++++++ 1 file changed, 239 insertions(+) create mode 100644 drivers/net/wireless/morsemicro/mm81x/ps.c diff --git a/drivers/net/wireless/morsemicro/mm81x/ps.c b/drivers/net/wireless/morsemicro/mm81x/ps.c new file mode 100644 index 000000000000..432165697acf --- /dev/null +++ b/drivers/net/wireless/morsemicro/mm81x/ps.c @@ -0,0 +1,239 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (c) 2017-2026 Morse Micro + */ +#include +#include +#include +#include +#include +#include +#include +#include +#include "hif.h" +#include "debug.h" +#include "skbq.h" +#include "mac.h" +#include "bus.h" +#include "ps.h" + +#define MM81X_WAKEUP_DELAY_MS 10 + +static bool mm81x_ps_is_busy_pin_asserted(struct mm81x *mm) +{ + bool active_high = + !(mm->firmware_flags & MM81X_FW_FLAGS_BUSY_ACTIVE_LOW); + + if (!mm->ps.gpios_supported) + return false; + + return (gpiod_get_value_cansleep(mm->ps.busy_gpio) == active_high); +} + +static void mm81x_ps_set_wake_gpio(struct mm81x *mm, bool raise) +{ + if (!mm->ps.gpios_supported) + return; + + gpiod_set_value_cansleep(mm->ps.wake_gpio, raise); + + mm81x_dbg(mm, MM81X_DBG_ANY, "%s wake up pin", + (raise) ? "set" : "cleared"); +} + +static void mm81x_ps_wait_after_wake_pin_raise(struct mm81x *mm) +{ + unsigned long timeout; + + if (!mm->ps.gpios_supported) + return; + + if (mm81x_ps_is_busy_pin_asserted(mm)) + return; + + timeout = msecs_to_jiffies(MM81X_WAKEUP_DELAY_MS); + wait_for_completion_timeout(mm->ps.awake, timeout); +} + +static void mm81x_ps_wakeup(struct mm81x_ps *mps) +{ + DECLARE_COMPLETION_ONSTACK(awake); + struct mm81x *mm = container_of(mps, struct mm81x, ps); + + if (!mps->enable || !mps->suspended) + return; + + WRITE_ONCE(mps->awake, &awake); + mm81x_ps_set_wake_gpio(mm, true); + mm81x_ps_wait_after_wake_pin_raise(mm); + WRITE_ONCE(mps->awake, NULL); + + mm81x_set_bus_enable(mm, true); + mps->suspended = false; +} + +static void mm81x_ps_sleep(struct mm81x_ps *mps) +{ + struct mm81x *mm = container_of(mps, struct mm81x, ps); + + if (!mps->enable || mps->suspended) + return; + + mps->suspended = true; + mm81x_set_bus_enable(mm, false); + mm81x_ps_set_wake_gpio(mm, false); +} + +static irqreturn_t mm81x_ps_irq_handle(int irq, void *arg) +{ + struct mm81x_ps *mps = (struct mm81x_ps *)arg; + struct mm81x *mm = container_of(mps, struct mm81x, ps); + struct completion *awake = READ_ONCE(mps->awake); + + if (awake) + complete(awake); + else + queue_work(mm->chip_wq, &mps->async_wake_work); + + return IRQ_HANDLED; +} + +static void mm81x_ps_async_wake_work(struct work_struct *work) +{ + struct mm81x_ps *mps = + container_of(work, struct mm81x_ps, async_wake_work); + struct mm81x *mm = container_of(mps, struct mm81x, ps); + + if (mm81x_ps_is_busy_pin_asserted(mm)) { + mutex_lock(&mps->lock); + mm81x_ps_wakeup(mps); + mutex_unlock(&mps->lock); + } +} + +static void mm81x_ps_evaluate(struct mm81x_ps *mps) +{ + struct mm81x *mm = container_of(mps, struct mm81x, ps); + bool needs_wake = false; + unsigned long expire; + unsigned long flags_on_entry = + (mm->hif.event_flags & + ~BIT(MM81X_HIF_EVT_DATA_TRAFFIC_PAUSE_PEND)); + + if (!mps->enable) + return; + + needs_wake = (mps->wakers > 0); + needs_wake |= (flags_on_entry > 0); + needs_wake |= (mm81x_hif_get_tx_buffered_count(mm) > 0); + + if (needs_wake) { + mm81x_ps_wakeup(mps); + return; + } + + if (!mm81x_ps_is_busy_pin_asserted(mm)) { + mm81x_ps_sleep(mps); + return; + } + + expire = msecs_to_jiffies(DEFAULT_BUS_TIMEOUT_MS); + cancel_delayed_work(&mps->delayed_eval_work); + queue_delayed_work(mm->chip_wq, &mps->delayed_eval_work, expire); +} + +static void mm81x_ps_evaluate_work(struct work_struct *work) +{ + struct mm81x_ps *mps = + container_of(work, struct mm81x_ps, delayed_eval_work.work); + + if (mps->enable) { + mutex_lock(&mps->lock); + mm81x_ps_evaluate(mps); + mutex_unlock(&mps->lock); + } +} + +static int mm81x_ps_irq_init(struct mm81x *mm) +{ + int irq; + struct mm81x_ps *mps = &mm->ps; + + if (!mm->ps.gpios_supported) + return 0; + + irq = gpiod_to_irq(mm->ps.busy_gpio); + if (irq < 0) + return irq; + + return request_irq(irq, (irq_handler_t)mm81x_ps_irq_handle, + (mm->firmware_flags & + MM81X_FW_FLAGS_BUSY_ACTIVE_LOW) ? + IRQF_TRIGGER_FALLING : + IRQF_TRIGGER_RISING, + "mm81x_notify", mps); +} + +static void mm81x_ps_irq_deinit(struct mm81x *mm) +{ + struct mm81x_ps *mps = &mm->ps; + + if (mm->ps.gpios_supported) + free_irq(gpiod_to_irq(mm->ps.busy_gpio), mps); +} + +void mm81x_ps_enable(struct mm81x *mm) +{ + struct mm81x_ps *mps = &mm->ps; + + if (mps->enable) { + mutex_lock(&mps->lock); + if (mps->wakers == 0) { + WARN_ON_ONCE(1); + } else { + mps->wakers--; + mm81x_ps_evaluate(mps); + } + mutex_unlock(&mps->lock); + } +} + +void mm81x_ps_disable(struct mm81x *mm) +{ + struct mm81x_ps *mps = &mm->ps; + + if (mps->enable) { + mutex_lock(&mps->lock); + mps->wakers++; + mm81x_ps_evaluate(mps); + mutex_unlock(&mps->lock); + } +} + +int mm81x_ps_init(struct mm81x *mm) +{ + struct mm81x_ps *mps = &mm->ps; + + mps->enable = !(mm->bus_type == MM81X_BUS_TYPE_SDIO && + !mm->ps.gpios_supported); + mps->suspended = true; + mps->wakers = 1; /* we default to being on */ + mutex_init(&mps->lock); + + INIT_WORK(&mps->async_wake_work, mm81x_ps_async_wake_work); + INIT_DELAYED_WORK(&mps->delayed_eval_work, mm81x_ps_evaluate_work); + + return mm81x_ps_irq_init(mm); +} + +void mm81x_ps_finish(struct mm81x *mm) +{ + struct mm81x_ps *mps = &mm->ps; + + if (mps->enable) { + mps->enable = false; + mm81x_ps_irq_deinit(mm); + cancel_work_sync(&mps->async_wake_work); + cancel_delayed_work_sync(&mps->delayed_eval_work); + } +} -- 2.43.0