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Date: Thu, 5 Apr 2012 09:30:25 +0800
From: Jason Lin <kernel.jason@...il.com>
To: Florian Fainelli <florian@...nwrt.org>
Cc: netdev@...r.kernel.org
Subject: Re: [RFC] net:phy:phylib: phy shares the same interrupt with mac
But, I need to enable PHY's interrupt by setting PHY's registers.
And after producing a interrupt, there needs a workqueue
to ack the PHY's interrupt.
The phy_start_interrupts() can enable PHY's interrupt.
If I do the following:
1) set phydev->irq = PHY_IGNORE_INTERRUPT;
2) invoke phy_connect();
3) phy_conenct() -> phy_connect_direct() ->
if (phydev->irq > 0)
phy_start_interrupts(phydev);
4) PHY_IGNORE_INTERRUPT = -2, it will not enable PHY's interrupt.
5) phy_start_interrupts() will connect to a callback function
config_intr() of each PHY library.
For example, drivers/net/phy/marvell.c, marvell_config_intr()
Need to set register 0x12 to 0x6400 to enable corresponding interrupts.
Any comments are appreciated.
Thanks.
在 2012年4月3日下午4:49，Florian Fainelli <florian@...nwrt.org> ��道：
> Hi,
>
> Le 04/03/12 04:11, Jason Lin a écrit :
>
>> 1) Add a new definition PHY_MAC if phy shares the same
>> interrupt with mac.
>> 2) Add do_phy_workqueue(), that mac can invoke this function
>> in its ISR when link status changed or other conditions.
>>
>> Does this seems reasonable?
>
>
> No, I think this is well handled by the PHY_IGNORE_INTERRUPT case
> (documented in Documentation/networking/phy.txt) by doing the following:
>
> - distinguish between MAC and PHY interrupts in your MAC interrupt handler
> (most likely you have separate bits for PHY interrupts)
> - once you see a PHY interrupt, call the appropriate PHY state machine
> callbacks to update the PHY state machine
>
>>
>>
>> ---------------------------
>> drivers/net/phy/phy.c | 27 +++++++++++++++++++++++++++
>> drivers/net/phy/phy_device.c | 4 ++--
>> include/linux/phy.h | 3 +++
>> 3 files changed, 32 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/net/phy/phy.c b/drivers/net/phy/phy.c
>> index 7670aac..c8009e9 100644
>> --- a/drivers/net/phy/phy.c
>> +++ b/drivers/net/phy/phy.c
>> @@ -527,6 +527,28 @@ static irqreturn_t phy_interrupt(int irq, void
>> *phy_dat)
>> return IRQ_HANDLED;
>> }
>>
>> +/*
>> + * do_phy_workqueue - PHY interrupt handler used by MAC
>> + * @irq: interrupt line
>> + * @phydev: phy_device pointer
>> + *
>> + * Description: When a PHY use the same interrupt with MAC,
>> + * the handler is invoked by MAC, and schedules a work task
>> + * to clear the PHY's interrupt.
>> + * This handler is invoked only in MAC's ISR.
>> + */
>> +irqreturn_t do_phy_workqueue(int irq, struct phy_device *phydev) {
>> +
>> + BUG_ON(!in_interrupt());
>> +
>> + if (PHY_HALTED == phydev->state)
>> + return IRQ_NONE;
>> +
>> + schedule_work(&phydev->phy_queue);
>> + return IRQ_HANDLED;
>> +}
>> +EXPORT_SYMBOL(do_phy_workqueue);
>> +
>> /**
>> * phy_enable_interrupts - Enable the interrupts from the PHY side
>> * @phydev: target phy_device struct
>> @@ -589,6 +611,11 @@ int phy_start_interrupts(struct phy_device *phydev)
>>
>> INIT_WORK(&phydev->phy_queue, phy_change);
>>
>> + if (phydev->irq == PHY_MAC) {
>> + err = phy_enable_interrupts(phydev);
>> + return err;
>> + }
>> +
>> atomic_set(&phydev->irq_disable, 0);
>> if (request_irq(phydev->irq, phy_interrupt,
>> IRQF_SHARED,
>> diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c
>> index 993c52c..1857097 100644
>> --- a/drivers/net/phy/phy_device.c
>> +++ b/drivers/net/phy/phy_device.c
>> @@ -345,7 +345,7 @@ int phy_connect_direct(struct net_device *dev,
>> struct phy_device *phydev,
>>
>> phy_prepare_link(phydev, handler);
>> phy_start_machine(phydev, NULL);
>> - if (phydev->irq> 0)
>> + if ((phydev->irq> 0) || (phydev->irq == PHY_MAC))
>> phy_start_interrupts(phydev);
>>
>> return 0;
>> @@ -399,7 +399,7 @@ EXPORT_SYMBOL(phy_connect);
>> */
>> void phy_disconnect(struct phy_device *phydev)
>> {
>> - if (phydev->irq> 0)
>> + if ((phydev->irq> 0) || (phydev->irq == PHY_MAC))
>> phy_stop_interrupts(phydev);
>>
>> phy_stop_machine(phydev);
>> diff --git a/include/linux/phy.h b/include/linux/phy.h
>> index 7da5fa8..155822c 100644
>> --- a/include/linux/phy.h
>> +++ b/include/linux/phy.h
>> @@ -44,9 +44,11 @@
>> * Set phydev->irq to PHY_POLL if interrupts are not supported,
>> * or not desired for this PHY. Set to PHY_IGNORE_INTERRUPT if
>> * the attached driver handles the interrupt
>> + * Set to PHY_MAC if using the same interrupt with MAC
>> */
>> #define PHY_POLL -1
>> #define PHY_IGNORE_INTERRUPT -2
>> +#define PHY_MAC -3
>>
>> #define PHY_HAS_INTERRUPT 0x00000001
>> #define PHY_HAS_MAGICANEG 0x00000002
>> @@ -510,6 +512,7 @@ int phy_ethtool_sset(struct phy_device *phydev,
>> struct ethtool_cmd *cmd);
>> int phy_ethtool_gset(struct phy_device *phydev, struct ethtool_cmd *cmd);
>> int phy_mii_ioctl(struct phy_device *phydev,
>> struct ifreq *ifr, int cmd);
>> +irqreturn_t do_phy_workqueue(int irq, struct phy_device *phydev);
>> int phy_start_interrupts(struct phy_device *phydev);
>> void phy_print_status(struct phy_device *phydev);
>> void phy_device_free(struct phy_device *phydev);
>> --
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