PCMCIA support for 860 -- lost interrupt

[Shuangjun Zhu]

>
>Damm wrote:
>>
>>
>>Shuangjun Zhu wrote:
>>>
>>1. what board are you trying to use pcmcia with?
>
>
>I'm using a MPC823 FADS board and PCMCIA for ATA/IDE,
>
>>2. check and see that m8xx_pcmcia gets your MHz or Hz value correct.
>>   The MHz/Hz value is used by my driver to calculate the number of
>>   waitstates necessary for all pcmcia accesses. So, if that is bad
>>   much stuff will get wierd.
>
>
>I have set the M8XX_BUSFREQ as following in m8xx_pcmcia.c,
>BTW, my MPC823 runs' frequency is 48MHZ, which pcmcia uses the SLOT_B.
>
>#ifdef CONFIG_BD_IS_MHZ
>#define M8XX_BUSFREQ (48 * 1000000)
>#else
>#define M8XX_BUSFREQ (48)
>#endif
>
>
>>> 1. why "lost interrupt"? irq for IDE is 9, PCMCIA_INTERRUPT=13,
>>>    so, which hardware trigger IRQ 9?
>>
>>Well, you have to figure out that one for yourself.
>>I have no idea. Maybe the MHz/Hz stuff above could help you.
>>Check proc/interrupts...
>>
>>The m8xx_pcmcia driver handles 1 (one) interrupt.
>>That interrupt is the status changed interrupt and it tells
>>us if someone has inserted/removed a card and some other stuff.
>>
>>Then - the pcmcia package will figure out what other interrupt
>>the device driver for the card you've inserted (ide, serial, etc)
>>will use. And then that (ide) code will request that irq and use
>>is as if it was any other interrupt. That is the second interrupt.
>
>
>From the code ide_cs.c in pcmcia package, the m8xx_pcmcia interrupt
>handler will call the ide_event() in ide_cs.c, this function does
>nothing with ide interrupt handler in the kernel.
>
>Here is Dan's ideas
>>See, this is why I changed the function name in the first place.
>>request_irq() assumes a PC-like interrupt structure, which doesn't work
>>on the MPC8xx internal interrupt controller.  You need to add an
>>indirect function call to the 'md' structure that will install the
>>IDE interrupt handler.  When you use the PCMCIA for ATA/IDE, you should
>>call a function that installs the PCMCIA interrupt vector.
>
>In drivers/block/ide-probe.c,
>init_irq() function has installed the IDE interrupt handler of IRQ 9 as
>ide_intr()
>In m8xx_pcmcia.c from the pcmcia package, Damm has installed the PCMCIA
>interrupt
>IRQ 13 as m8xx_interrupt(), so problem is:
>without 8259 controller in FADS board, how the m8xx_interrupt() route the
>interrupt
>event to the ide_intr(). No hardware triger the IRQ 9, no call ide_intr(),
>so the
>kernel think "lost interrupt", I guess.


Here is the result:
bash# cat /proc/inter*
           CPU0
  5:       2394   8xx SIU       cpm
  9:          0   8xx SIU       ide0
 13:          9   8xx SIU       m8xx_pcmcia
 15:          0   8xx SIU       tbint
BAD:          0


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