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SubjectRe: [PATCH 5/5] net: macb: Add WoL interrupt support for MACB type of Ethernet controller
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On 4/16/2020 10:44 AM, nicolas.ferre@microchip.com wrote:
> From: Nicolas Ferre <nicolas.ferre@microchip.com>
>
> Handle the Wake-on-Lan interrupt for the Cadence MACB Ethernet
> controller.
> As we do for the GEM version, we handle of WoL interrupt in a
> specialized interrupt handler for MACB version that is positionned
> just between suspend() and resume() calls.
>
> Signed-off-by: Nicolas Ferre <nicolas.ferre@microchip.com>
> ---
> drivers/net/ethernet/cadence/macb_main.c | 38 +++++++++++++++++++++++-
> 1 file changed, 37 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/net/ethernet/cadence/macb_main.c b/drivers/net/ethernet/cadence/macb_main.c
> index 71e6afbdfb47..6d535e3e803c 100644
> --- a/drivers/net/ethernet/cadence/macb_main.c
> +++ b/drivers/net/ethernet/cadence/macb_main.c
> @@ -1513,6 +1513,34 @@ static void macb_tx_restart(struct macb_queue *queue)
> macb_writel(bp, NCR, macb_readl(bp, NCR) | MACB_BIT(TSTART));
> }
>
> +static irqreturn_t macb_wol_interrupt(int irq, void *dev_id)
> +{
> + struct macb_queue *queue = dev_id;
> + struct macb *bp = queue->bp;
> + u32 status;
> +
> + status = queue_readl(queue, ISR);
> +
> + if (unlikely(!status))
> + return IRQ_NONE;
> +
> + spin_lock(&bp->lock);
> +
> + if (status & MACB_BIT(WOL)) {
> + queue_writel(queue, IDR, MACB_BIT(WOL));
> + macb_writel(bp, WOL, 0);
> + netdev_vdbg(bp->dev, "MACB WoL: queue = %u, isr = 0x%08lx\n",
> + (unsigned int)(queue - bp->queues),
> + (unsigned long)status);
> + if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE)
> + queue_writel(queue, ISR, MACB_BIT(WOL));
> + }

Likewise, this would need a call to pm_wakeup_event() to record the
wake-up event associated with this device.
--
Florian

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