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Commit a744e016 authored by Ivan Kokshaysky's avatar Ivan Kokshaysky Committed by Linus Torvalds
Browse files

alpha: resurrect Cypress IDE quirk 



Which was removed in the hope that generic legacy IDE quirk in
drivers/pci/probe.c is sufficient for Cypress IDE.
It isn't, as this controller has non-standard BAR layout:
secondary channel registers are in the BAR0-1 of the second
PCI function - not in the BAR2-3 of the same function, as the
generic quirk routine assumes.

Signed-off-by: default avatarIvan Kokshaysky <ink@jurassic.park.msu.ru>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent d559d4a2

arch/alpha/kernel/pci.c

+17 −0
Original line number Original line Diff line number Diff line
@@ -71,6 +71,23 @@ DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82378, quirk_i 
static void __init

static void __init

quirk_cypress(struct pci_dev *dev)

quirk_cypress(struct pci_dev *dev)

{

{

	/* The Notorious Cy82C693 chip.  */



	/* The generic legacy mode IDE fixup in drivers/pci/probe.c

	   doesn't work correctly with the Cypress IDE controller as

	   it has non-standard register layout.  Fix that.  */

	if (dev->class >> 8 == PCI_CLASS_STORAGE_IDE) {

		dev->resource[2].start = dev->resource[3].start = 0;

		dev->resource[2].end = dev->resource[3].end = 0;

		dev->resource[2].flags = dev->resource[3].flags = 0;

		if (PCI_FUNC(dev->devfn) == 2) {

			dev->resource[0].start = 0x170;

			dev->resource[0].end = 0x177;

			dev->resource[1].start = 0x376;

			dev->resource[1].end = 0x376;

		}

	}



	/* The Cypress bridge responds on the PCI bus in the address range

	/* The Cypress bridge responds on the PCI bus in the address range

	   0xffff0000-0xffffffff (conventional x86 BIOS ROM).  There is no

	   0xffff0000-0xffffffff (conventional x86 BIOS ROM).  There is no

	   way to turn this off.  The bridge also supports several extended

	   way to turn this off.  The bridge also supports several extended