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[PATCH] SNI PCIT CPLUS: workaround for messed up PCI irq wiring

To: linux-mips@linux-mips.org
Subject: [PATCH] SNI PCIT CPLUS: workaround for messed up PCI irq wiring
From: tsbogend@alpha.franken.de (Thomas Bogendoerfer)
Date: Thu, 8 Nov 2007 22:09:11 +0100
Cc: ralf@linux-mips.org
Original-recipient: rfc822;linux-mips@linux-mips.org
Sender: linux-mips-bounce@linux-mips.org
User-agent: Mutt/1.5.13 (2006-08-11)
SNI PCIT CPLUS: workaround for messed up irq wiring for onboard PCI bus 1 

Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
---

diff --git a/arch/mips/pci/fixup-sni.c b/arch/mips/pci/fixup-sni.c
index a45bedd..5c8a79b 100644
--- a/arch/mips/pci/fixup-sni.c
+++ b/arch/mips/pci/fixup-sni.c
@@ -113,6 +113,16 @@ static char irq_tab_pcit[13][5] __initdata = {
        {     0,  INTA,  INTB,  INTC,  INTD },  /* Slot 5 */
 };
 
+static char irq_tab_pcit_cplus[13][5] __initdata = {
+       /*       INTA  INTB  INTC  INTD */
+       {     0,     0,     0,     0,     0 },  /* HOST bridge */
+       {     0,  INTB,  INTC,  INTD,  INTA },  /* PCI Slot 9 */
+       {     0,     0,     0,     0,     0 },  /* PCI-EISA */
+       {     0,     0,     0,     0,     0 },  /* Unused */
+       {     0,  INTA,  INTB,  INTC,  INTD },  /* PCI-PCI bridge */
+       {     0,  INTB,  INTC,  INTD,  INTA },  /* fixup */
+};
+
 static inline int is_rm300_revd(void)
 {
        unsigned char csmsr = *(volatile unsigned char *)PCIMT_CSMSR;
@@ -123,8 +133,19 @@ static inline int is_rm300_revd(void)
 int __init pcibios_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
 {
        switch (sni_brd_type) {
-       case SNI_BRD_PCI_TOWER:
        case SNI_BRD_PCI_TOWER_CPLUS:
+               if (slot == 4) {
+                       /*
+                        * SNI messed up interrupt wiring for onboard
+                        * PCI bus 1; we need to fix this up here
+                        */
+                       while (dev && dev->bus->number != 1)
+                               dev = dev->bus->self;
+                       if (dev && dev->devfn >= PCI_DEVFN(4, 0))
+                               slot = 5;
+               }
+               return irq_tab_pcit_cplus[slot][pin];
+       case SNI_BRD_PCI_TOWER:
                return irq_tab_pcit[slot][pin];
 
        case SNI_BRD_PCI_MTOWER:
-- 
Crap can work. Given enough thrust pigs will fly, but it's not necessary a
good idea.                                                [ RFC1925, 2.3 ]

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