[PATCH] 2.4.30 PicoPower IRQ router

[Sune Mølgaard <sune@molgaard.org>]

The following patch fixes Picopower PT86C523 (found in e.g. Dell 
Latitude XPI P150CD and, so I've heard, IBM Thinkpad 760 series) getting 
irq 0, and thus not working with yenta.
Patch is made from recommendations from David Hinds.

Best regards,

Sune Mølgaard

--- linux-2.4.30/arch/i386/kernel/pci-irq.c	2005-04-04 03:42:19.000000000 +0200
+++ linux/arch/i386/kernel/pci-irq.c	2005-04-25 08:43:02.501678464 +0200
@@ -157,6 +157,25 @@
 }
 
 /*
+ * PicoPower PT86C523
+ */
+
+static int pirq_pico_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
+{
+  outb(0x10+((pirq-1)>>1), 0x24);
+  return ((pirq-1)&1) ? (inb(0x26)>>4) : (inb(0x26)&0xf);
+}
+
+static int pirq_pico_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq) 
+{ 
+  outb(0x10+((pirq-1)>>1), 0x24);
+  unsigned int x;
+  x = inb(0x26); 
+  x = ((pirq-1)&1) ? ((x&0x0f)|(irq<<4)) : ((x&0xf0)|(irq)); 
+  outb(x,0x26); 
+} 
+
+/*
  * ALI pirq entries are damn ugly, and completely undocumented.
  * This has been figured out from pirq tables, and it's not a pretty
  * picture.
@@ -609,6 +628,23 @@
 
 #endif
 
+static __init int pico_router_probe(struct irq_router *r, struct pci_dev *router, u16 device)
+{
+  switch(device)
+  {
+    case 0x0002:
+      r->name = "PicoPower PT86C523";
+      r->get = pirq_pico_get;
+      r->set = pirq_pico_set;
+      return 1;
+
+    case 0x8002:
+      r->name = "PicoPower PT86C523 rev. BB+";
+      r->get = pirq_pico_get;
+      r->set = pirq_pico_set;
+      return 1;
+  }
+}
 
 static __init int intel_router_probe(struct irq_router *r, struct pci_dev *router, u16 device)
 {
@@ -814,6 +850,7 @@
 }
 		
 static __initdata struct irq_router_handler pirq_routers[] = {
+        { 0x1066, pico_router_probe },
 	{ PCI_VENDOR_ID_INTEL, intel_router_probe },
 	{ PCI_VENDOR_ID_AL, ali_router_probe },
 	{ PCI_VENDOR_ID_ITE, ite_router_probe },