cpsw_probe() in linux SDK6.0 / AM335x

Fergal Goggin

Hi,

There are request_irq() calls in cpsw_probe() which are setting up interrupts on pin 2,29(gpio93) and pin 2,30 (gpio94). This appears to be related to a silicon errata “Advisory 1.0.9 Ethernet Media Access Controller and Switch Subsystem: C0_TX_PEND and C0_RX_PEND Interrupts Not Connected to ARM Cortex-A8”.

However, I do not see anything connected to these pins on my AM335x board so my questions are:

1) Am I precluded from using this pins for other purposes?

2) where is the interrupt source for gpio93 and gpio92 coming from? is it the timer block?

Regards

Fergal.

over 9 years ago

0 Biser Gatchev-XID over 9 years ago

TI__Guru**** 393215 points

Hi Fergal,

I will forward this to the SW experts.

0 Ivan Matrakov over 9 years ago in reply to Biser Gatchev-XID

TI__Expert 4475 points

Hi Fergal,

If you use this pin as explained in this source you can't use it for other purposes. If this IRQ not requested you will see the message below "error attaching irq\n". If requested well you can't see any message. If you want to use for other purpose even though you have to change the pinmux of the pin and not to use in this source.
The interrupt source is cpsw_interrupt. See the syntactics of the request_irq() command.

BR
Ivan

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cpsw_probe() in linux SDK6.0 / AM335x