linux-kernel - Re: [PATCH 5/5] net: macb: Add WoL interrupt support for MACB type of Ethernet controller

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Date:   Thu, 16 Apr 2020 12:26:23 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     nicolas.ferre@...rochip.com, linux-arm-kernel@...ts.infradead.org,
        netdev@...r.kernel.org,
        Claudiu Beznea <claudiu.beznea@...rochip.com>,
        harini.katakam@...inx.com
Cc:     linux-kernel@...r.kernel.org,
        "David S. Miller" <davem@...emloft.net>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        pthombar@...ence.com, sergio.prado@...abworks.com,
        antoine.tenart@...tlin.com, linux@...linux.org.uk, andrew@...n.ch,
        michal.simek@...inx.com
Subject: Re: [PATCH 5/5] net: macb: Add WoL interrupt support for MACB type of
 Ethernet controller



On 4/16/2020 10:44 AM, nicolas.ferre@...rochip.com wrote:
> From: Nicolas Ferre <nicolas.ferre@...rochip.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@...rochip.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