Re: [PATCH] Add SATA device to VIA IRQ quirk fixup list

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



Hi, Alan 

But can we know if dev->irq is XT-PIC ?  or not ? 
or could we know if IO_APIC or LOCAL_APIC is enabled or
not ?

on linux-2.6.17/drivers/pci/quirks.c    

  * we must mask the PCI_INTERRUPT_LINE value versus 0xf to get
  * interrupts delivered properly.
  */

 static void quirk_via_irq(struct pci_dev *dev)
 {
        u8 irq, new_irq;

I want put here something like:  if ( dev->irq != XT-PIC) return and
don't quirk this dev.
        else 

        new_irq = dev->irq & 0xf;
        pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &irq);



On Wed, 2006-07-26 at 01:42 +0100, Alan Cox wrote:
> A few comments
> 
> "The legacy IDE is using IRQ 14 or 15 not PCI"
> 
> This is half correct - V-Link is not involved in this case, however the
> legacy IRQs are configurable and steerable via func 0 reg 0x4C for some
> chips. If this has been set by a weirdass bios (bits 3-0 not 0x0100 for
> the 8233C  varies for others) then we've never supported it.
> 
> 
> I have full IRQ routing info for some of the VIA chips and it varies by
> chip how this all works.
> 
> The 8233/8233C routes via register 0x4C/0x4D of function 0 for internal
> devices and via 0x55->0x57 (polarities on 0x54) for PCI interrupts. The
> devices use the IRQ number not line. Also to add fun the 8233C has a
> 3com nic part that does this...
> 
> There are then a seperate set of register mappings for SCI and for ISA
> IRQ mapping.
> 
> There is an errata with the internal devices of the 8235 and earlier
> which can be used to detect them fairly well. Only the low four bits of
> 0ffset 0x3C are writable not the full IRQ value.
> 
> 
> Some later chips use bits to indicate PIC v APIC routing.
> 
> -
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> the body of a message to [email protected]
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
> Please read the FAQ at  http://www.tux.org/lkml/
-- 
Sérgio M.B.

Attachment: smime.p7s
Description: S/MIME cryptographic signature


[Index of Archives]     [Kernel Newbies]     [Netfilter]     [Bugtraq]     [Photo]     [Stuff]     [Gimp]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Video 4 Linux]     [Linux for the blind]     [Linux Resources]
  Powered by Linux