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SubjectRe: [PATCH] yet another yenta resource allocation fix
On Mon, 1 Oct 2001, Martin Diehl wrote:

> On Mon, 1 Oct 2001, Alan Cox wrote:
>
> > Would a generic
> >
> > pci_fixup_device()
> >
> > type function not be more appropriate
>
> IIRC there was some discussion on l-k some time ago, whether such fixups
> should stay close to were the issue appeared or better be placed at
> generic pci quirk location. In this particular case I personally tend to
> the latter one as well, particularly because there may be other BIOS'
> doing similar things with non-cardbus memory bar's.

Just to follow-up myself, seems the general pci-quirk approach is superior
because there is no need to release-modify-reclaim the bad resource when
fixing during pci header scan. Furthermore, there is already a cardbus
specific fixup (disabling legacy registers) in drivers/pci/quirks.c.
So I've just moved and adjusted the stuff to the same location.

Improved patch vs. 2.4.10 below. Successfully tested on my OB-800 where
the "featured" BIOS maps the cardbus bar at 0xe6000.

Regards,
Martin

-------------------------

--- linux-2.4.10/drivers/pci/quirks.c Sun Sep 30 15:55:13 2001
+++ v2.4.10-md/drivers/pci/quirks.c Mon Oct 1 12:48:41 2001
@@ -412,6 +412,57 @@
}


+/* BIOS might have mapped the cardbus memory resource to a bogus location
+ * in legacy memory area and the hostbridge somehow looses this window
+ * after pm-suspend (seen on OB800).
+ * We try to detect and fix this by re-assigning the resource if we
+ * find it mapped to legacy area <1M. But we don't try, if the obsolete
+ * MEM_TYPE_1M flag is set, just in case...
+ */
+
+static void __init quirk_cardbus_bar(struct pci_dev *dev)
+{
+ unsigned long oldstart;
+ u32 temp, extend;
+ struct resource *res;
+
+ if ((PCI_CLASS_BRIDGE_CARDBUS << 8) ^ dev->class)
+ return;
+
+ if (!(dev->resource[0].flags&IORESOURCE_MEM)) /* not cardbus memory BAR */
+ return;
+
+ oldstart = dev->resource[0].start;
+ if (oldstart >= 0x00100000UL) /* mapped above 1MB legacy area - fine! */
+ return;
+
+ pci_read_config_dword(dev, PCI_BASE_ADDRESS_0, &temp);
+ if (temp & PCI_BASE_ADDRESS_MEM_TYPE_1M) {
+ printk(KERN_DEBUG "%s: cardbus memory has obsolete 1M flag set?\n",
+ __FUNCTION__);
+ return;
+ }
+
+ /* re-read required size and flags from device */
+
+ pci_write_config_dword(dev, PCI_BASE_ADDRESS_0, 0xffffffff);
+ pci_read_config_dword(dev, PCI_BASE_ADDRESS_0, &temp);
+ if (temp & PCI_BASE_ADDRESS_SPACE_IO) { /* paranoia */
+ pci_write_config_dword(dev, PCI_BASE_ADDRESS_0, oldstart);
+ printk(KERN_WARNING "%s: cardbus memory mutated to io?\n",
+ __FUNCTION__);
+ return;
+ }
+ extend = ~(u32)(temp & PCI_BASE_ADDRESS_MEM_MASK);
+
+ res = &dev->resource[0];
+ res->start = 0;
+ res->end = res->start + extend;
+ res->flags = IORESOURCE_MEM;
+ if (temp & PCI_BASE_ADDRESS_MEM_PREFETCH)
+ res->flags |= IORESOURCE_PREFETCH;
+}
+
/*
* The main table of quirks.
*/
@@ -462,6 +513,7 @@
{ PCI_FIXUP_FINAL, PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C586_2, quirk_via_irqpic },
{ PCI_FIXUP_FINAL, PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C686_5, quirk_via_irqpic },
{ PCI_FIXUP_FINAL, PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C686_6, quirk_via_irqpic },
+ { PCI_FIXUP_HEADER, PCI_ANY_ID, PCI_ANY_ID, quirk_cardbus_bar },

{ 0 }
};
-
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