RE: MMC_CAP_SDIO_IRQ for omap 3430

Madhusudhan
2009-10-19T17:27:51Z

________________________________________
From: John Rigby [mailto:jcrigby@gmail.com]
Sent: Sunday, October 18, 2009 7:24 PM
To: Woodruff, Richard
Cc: Dirk Behme; Chikkature Rajashekar, Madhusudhan;
linux-mmc@vger.kernel.org; linux-omap@vger.kernel.org; Steve Sakoman
Subject: Re: MMC_CAP_SDIO_IRQ for omap 3430

Ok I was going to ask where you found that but I just rechecked the TRM and
there it is in plain site:

When this bit is set to 1, the host controller automatically disables all
the input buffers except the buffer of mmci_dat[1] outside of a transaction
in order to detect asynchronous card interrupt on mmci_dat[1] line and
minimize the leakage current of the buffers.

In my defence, I did search the TRM for every occurance of dat1 but not
dat[1].  Oh well live and learn and forget and repeat.

John

So, Does the SDIO card interrupt mode work fine now?

Regards,
Madhu

On Sun, Oct 18, 2009 at 6:17 PM, John Rigby <jcrigby@gmail.com> wrote:
> Richard,
>
> MMCHS_CON.CPTL = 1  < Don't disable input buffer on DAT1 after
> completion to allow seeing SDIO interrupt>
>
> Sounds exactly like what we need.
>
> Thanks
> John
>
> On Sun, Oct 18, 2009 at 5:12 PM, Woodruff, Richard <r-woodruff2@ti.com>
wrote:
>>
>>> From: linux-omap-owner@vger.kernel.org [mailto:linux-omap-
>>> owner@vger.kernel.org] On Behalf Of Dirk Behme
>>> Sent: Sunday, October 18, 2009 11:45 AM
>>
>>> > It would be funny if the TRM was wrong and the CIRQ bit is really
>>> > cleared by writing 1 to it.  I'll try that.
>>
>> A while back I hunted down a few of the bits for this.  Maybe this will
help some.
>>
>> SYSCONFIG.ENAWAKEUP = 1 < allow ocp wrapper to generate an interrupt to
prcm>
>> MMCHS_HCTL.IWE = 1 < route wake up to module ocp wrapper>
>> MMCHS_CON.CPTL = 1  < Don't disable input buffer on DAT1 after completion
to allow seeing SDIO interrupt>
>> MMCHS_HCTL.IWE
>> MMCHS_ISE.CIRQ_ENABLE <bit to write to enable interrupt at pin>
>> MMCHS_STAT<bit to write for clear of SDIO interrupt>
>> CCCCR - IRQ_ENABLE (think host stack will do this)
>>
>> Regards,
>> Richard W.
>>
>