Commit 997a51ae authored by Ivan Kokshaysky's avatar Ivan Kokshaysky Committed by Linus Torvalds
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[PATCH] Alpha: ISA IRQs fixup for dp264 



Basically, this extends original dp264 fixup to all dp264 variations.
Here is one minor change: mask out bits 4-7 of a value assigned by SRM,
because
- newer consoles report ISA IRQs with offset 0xe0;
- even if console IRQ value is bogus, we'll have a value < 16
  so it should be harmless as it won't clash with native IRQs.

Particularly this fixes USB interrupt problem on xp1000 and es40.

Signed-off-by: default avatarIvan Kokshaysky <ink@jurassic.park.msu.ru>
Acked-by: default avatarRichard Henderson <rth@twiddle.net>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 044a500e

arch/alpha/kernel/sys_dp264.c

+23 −18
Original line number Diff line number Diff line
@@ -394,6 +394,22 @@ clipper_init_irq(void) 
 *  10	 64 bit PCI option slot 3 (not bus 0)

 */



static int __init

isa_irq_fixup(struct pci_dev *dev, int irq)

{

	u8 irq8;



	if (irq > 0)

		return irq;



	/* This interrupt is routed via ISA bridge, so we'll

	   just have to trust whatever value the console might

	   have assigned.  */

	pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &irq8);



	return irq8 & 0xf;

}



static int __init

dp264_map_irq(struct pci_dev *dev, u8 slot, u8 pin)

{
@@ -407,25 +423,13 @@ dp264_map_irq(struct pci_dev *dev, u8 slot, u8 pin) 
		{ 16+ 3, 16+ 3, 16+ 2, 16+ 1, 16+ 0}  /* IdSel 10 slot 3 */

	};

	const long min_idsel = 5, max_idsel = 10, irqs_per_slot = 5;



	struct pci_controller *hose = dev->sysdata;

	int irq = COMMON_TABLE_LOOKUP;



	if (irq > 0) {

	if (irq > 0)

		irq += 16 * hose->index;

	} else {

		/* ??? The Contaq IDE controller on the ISA bridge uses

		   "legacy" interrupts 14 and 15.  I don't know if anything

		   can wind up at the same slot+pin on hose1, so we'll

		   just have to trust whatever value the console might

		   have assigned.  */



		u8 irq8;

		pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &irq8);

		irq = irq8;

	}



	return irq;

	return isa_irq_fixup(dev, irq);

}



static int __init
@@ -453,7 +457,8 @@ monet_map_irq(struct pci_dev *dev, u8 slot, u8 pin) 
		{    24,    24,    25,    26,    27}  /* IdSel 15 slot 5 PCI2*/

	};

	const long min_idsel = 3, max_idsel = 15, irqs_per_slot = 5;

	return COMMON_TABLE_LOOKUP;



	return isa_irq_fixup(dev, COMMON_TABLE_LOOKUP);

}



static u8 __init
@@ -507,7 +512,8 @@ webbrick_map_irq(struct pci_dev *dev, u8 slot, u8 pin) 
		{    47,    47,    46,    45,    44}, /* IdSel 17 slot 3 */

	};

	const long min_idsel = 7, max_idsel = 17, irqs_per_slot = 5;

	return COMMON_TABLE_LOOKUP;



	return isa_irq_fixup(dev, COMMON_TABLE_LOOKUP);

}



static int __init
@@ -524,14 +530,13 @@ clipper_map_irq(struct pci_dev *dev, u8 slot, u8 pin) 
		{    -1,    -1,    -1,    -1,    -1}  /* IdSel 7 ISA Bridge */

	};

	const long min_idsel = 1, max_idsel = 7, irqs_per_slot = 5;



	struct pci_controller *hose = dev->sysdata;

	int irq = COMMON_TABLE_LOOKUP;



	if (irq > 0)

		irq += 16 * hose->index;



	return irq;

	return isa_irq_fixup(dev, irq);

}



static void __init

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