Re: [parisc-linux] Re: [PATCH] PCMCIA: Disable probing on parisc

[Helge Deller <deller@gmx.de>]

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On Sunday 11 December 2005 21:37, James Bottomley wrote:
> On Sun, 2005-12-11 at 19:55 +0100, Helge Deller wrote:
> > Seems ok, but I still have the "stuck IRQ" problem:
> 
> Hmm, perhaps the place to start for this is the firmware information:
> In my system, the firmware actually disables the PCMCIA bridge (I assume
> because it doesn't understand it).  That's why I added all the code to
> dino to redo the entire PCI resource tree, so that it automatically
> brings up the PCMCIA bridge.  However, your firmware should understand
> the PCMCIA bridge, but it might have some other way of routing the IRQ.

Grant helped me to analyze this problem.
The pcmcia irq line seems to be allways off-by-one, e.g. PCI irq 25 got local irq 2 on dino which was wrong and should have become "1".
Grants comment on this was: "Sounds like we need a quirk in drivers/pci/quirks.c to deal with this."
 "or our algorithm for routing IRQ_PIN to INTERRUPT_LINE routing is broken."

Based on that I just created the attached patch. With it pcmcia now works for me.
Maybe you have an idea if something in dino is wrong ?

Helge

dmesg:
PCI: Cirrus Cardbus IRQ fixup for 0000:00:02.0, from 25 to 24 (old native irq=2)
Yenta: CardBus bridge found at 0000:00:02.0 [0000:0000]
PCI: Bus 1, cardbus bridge: 0000:00:02.0
  IO window: 00000400-000005ff
  IO window: 00000800-000009ff
  PREFETCH window: f0c00000-f0ffffff
  MEM window: f0900000-f09fffff
Yenta: ISA IRQ mask 0x0000, PCI irq 24
Socket status: 30000007
pcmcia: parent PCI bridge I/O window: 0x0 - 0xffff
pcmcia: parent PCI bridge Memory window: 0xf0800000 - 0xf0ffffff
PCI: Cirrus Cardbus IRQ fixup for 0000:00:02.1, from 26 to 25 (old native irq=3)
Yenta: CardBus bridge found at 0000:00:02.1 [0000:0000]
PCI: Bus 5, cardbus bridge: 0000:00:02.1
  IO window: 00000c00-00000dff
  IO window: 00001000-000011ff
  PREFETCH window: f0a00000-f0afffff
  MEM window: f0b00000-f0bfffff
Yenta: ISA IRQ mask 0x0000, PCI irq 25
Socket status: 30000007
pcmcia: parent PCI bridge I/O window: 0x0 - 0xffff
pcmcia: parent PCI bridge Memory window: 0xf0800000 - 0xf0ffffff
ds: ds_open(socket 0)

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Index: quirks.c
===================================================================
RCS file: /var/cvs/linux-2.6/drivers/pci/quirks.c,v
retrieving revision 1.35
diff -u -p -r1.35 quirks.c
--- quirks.c	12 Nov 2005 04:08:03 -0000	1.35
+++ quirks.c	11 Dec 2005 22:22:58 -0000
@@ -862,6 +862,28 @@ static void __init quirk_eisa_bridge(str
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL,	PCI_DEVICE_ID_INTEL_82375,	quirk_eisa_bridge );
 
 /*
+ * Cirrus 6832 Cardbus reports wrong irq on RDI Tadpole PARISC Laptop.
+ */
+#if defined(CONFIG_PARISC)
+static void __devinit quirk_hp_cardbus(struct pci_dev *dev)
+{
+        u8 irq, new_irq;
+
+	new_irq = dev->irq - 1;
+        pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &irq);
+
+	printk(KERN_ERR "PCI: Cirrus Cardbus IRQ fixup for %s, from %d to %d (old native irq=%d)\n",
+                        pci_name(dev), dev->irq, new_irq, irq);
+	dev->irq = new_irq;
+
+	udelay(15);     /* unknown if delay really needed */
+	pci_write_config_byte(dev, PCI_INTERRUPT_LINE, new_irq);
+
+}
+DECLARE_PCI_FIXUP_ENABLE(PCI_VENDOR_ID_CIRRUS,	PCI_DEVICE_ID_CIRRUS_6832,	quirk_hp_cardbus );
+#endif
+
+/*
  * On ASUS P4B boards, the SMBus PCI Device within the ICH2/4 southbridge
  * is not activated. The myth is that Asus said that they do not want the
  * users to be irritated by just another PCI Device in the Win98 device

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