proposed patch, notsigned off, comments welcome.

[ron minnich]

This is a first try at a program to grok lxirqs.

Sanity check first, I'm not signing this off yet. Are the enable and
invert tests correct below?

Long term goal is a program that will follow the IRQ through the magic
rabbit hole and up
to the CPU. I don't know how to do vr reads in user mode, however.

Here's the current output on alix1c, which is strange looking to me.
IRQ A, GPIO pin 0
Input Enabled and Not Inverted
IRQ B, GPIO pin 7
Input Enabled and Inverted
IRQ C, GPIO pin 12
Input Enabled and Inverted
IRQ D, GPIO pin 13
Input Disabled and Not Inverted

[Carl-Daniel Hailfinger]

On 11.05.2008 21:33, ron minnich wrote:
> This is a first try at a program to grok lxirqs.
>
> Sanity check first, I'm not signing this off yet. Are the enable and
> invert tests correct below?
>
> Long term goal is a program that will follow the IRQ through the magic
> rabbit hole and up
> to the CPU. I don't know how to do vr reads in user mode, however.

What do you mean with VR? MSRs? If so, we have code in flashrom you can
copy (it's basically opening /dev/msr as file, then seeking to the
desired MSR, followed by read/write). Pleas be aware that you need to
modprobe msr before using /dev/msr.
> Here's the current output on alix1c, which is strange looking to me.
> IRQ A, GPIO pin 0
> Input Enabled and Not Inverted
> IRQ B, GPIO pin 7
> Input Enabled and Inverted
> IRQ C, GPIO pin 12
> Input Enabled and Inverted
> IRQ D, GPIO pin 13
> Input Disabled and Not Inverted

Regards,
Carl-Daniel

[ron minnich]

On Sun, May 11, 2008 at 1:09 PM, Carl-Daniel Hailfinger
 wrote:
> I don't know how to do vr reads in user mode, however.
> >
>
> What do you mean with VR? MSRs?

A vr is a virtual register managed by VSA, as in this:
                vr_write((VRC_MISCELLANEOUS << 8) + PCI_INT_AB,
                         (sb->enable_gpio_int_route & 0xFFFF));

which is this:
 /*
  * Read from a Virtual Register
  * @param class_index The register index
  * @return the 16-bit word of data
  */
static inline u16 vr_read(u16 class_index)
{
        u16 data;
        outl(((u32) VR_UNLOCK << 16) | class_index, VRC_INDEX);
        data = inw(VRC_DATA);
        return data;
}

which seems simple enough if I trust it. Guess I'll try it later. For
now, it's not essential to use it since I know the value is 0x0d0c0700

ron