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List:       linux-arm-kernel
Subject:    Re: q:cf/pcmcia
From:       Yann Desplanches <yann.desplanches () cdf ! in2p3 ! fr>
Date:       2004-08-04 9:14:10
Message-ID: ceq9d2$45k$1 () sea ! gmane ! org
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ok,
but unfortunately,on at91rm9200dk evalution board, RDY/BSY is not wired...

Steven Scholz a écrit :
> Yann Desplanches wrote:
> 
>>
>>  > the driver work for ide mode,it need interrupt,but at91rm9200 
>> hardware design only for memory mode ,
>>  > it can't support interrupt,so driver always output info "lost 
>> interrupt".
>>  > I don't know that is right? who can solve this problem.
>>  > I just delete printf in driver
>>
>> I don't be a "kernel specialist"... but working in polling mode (with 
>> timer expiry) with just only a "cfcard ide device" do not seem to be a 
>> problem: in ide_intr() and in ide_timer_expiry(), if drive_is_ready() 
>> we call  hwgroup->handler(). And in  ide_timer_expiry() we just ack 
>> int and print a message.
>> But working with another ide device?? -> timeout problem? sharing same 
>> irq? etc...
> 
> 
> The problems is drivers/at91/pcmcia/at91_lowlevel.c:
> 
> int at91_pcmcia_get_irq_info(struct pcmcia_irq_info *info)
> {
> 
>         if (info->sock >= AT91_PCMCIA_MAX_SOCK)
>                 return -1;
>         info->irq = at91_pcmcia_irqs[0].irq;
>         return 0;
> }
> 
> If your irq line from the CF socket (a.k.a. RDY/BSY) is not connected to 
> the same GPIO port as the status lines (CD1,CD2).
> 
> If you're using a real irq line for the CF socket RDY/BSY signal and no 
> GPIO pin then the above function should return something like
> 
>         info->irq = AT91C_ID_IRQ5;
> 
> instead!!!
> Make sure that you configure and enable the IRQ5 pin.
> 
> It might be possible to connect RDY/BSY to a GPIO pin. Even on the same 
> port as the status lines (CD1,CD2).
> But then you habe to make sure that the at91 pcmcia irq handler supports 
> shared irq.
> 
> But IMHO the first way is the better.
> 
> 


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