[U-Boot] [RESPIN PATCH v2 15/15] x86: queensbay: Change PCIe root ports' interrupt routing

[Bin Meng]

So far interrupt routing works pretty well for any on-chip devices
on Intel Crown Bay. When inserting any PCIe card to any PCIe slot,
Linux kernel is smart enough to do interrupt swizzling and figure
out device's irq using its parent bridge's interrupt routing info
all the way up to its root port. In U-Boot all PCIe root ports'
interrupts were routed to PIRQ E/F/G/H before, while actually all
PCIe downstream ports received INTx are routed to PIRQ A/B/C/D
directly and not configurable. Now we change this mapping so that
any external PCIe device can work correctly.

Signed-off-by: Bin Meng <bmeng.cn at gmail.com>

---

Changes in v2:
- New patch to change PCIe root ports' interrupt routing for queensbay

 arch/x86/cpu/queensbay/tnc.c | 13 +++++++------
 arch/x86/dts/crownbay.dts    | 20 ++++++++++++++++----
 2 files changed, 23 insertions(+), 10 deletions(-)

diff --git a/arch/x86/cpu/queensbay/tnc.c b/arch/x86/cpu/queensbay/tnc.c
index 873de7b..d27b2d9 100644
--- a/arch/x86/cpu/queensbay/tnc.c
+++ b/arch/x86/cpu/queensbay/tnc.c
@@ -69,17 +69,18 @@ void cpu_irq_init(void)
 	 * Route TunnelCreek PCI device interrupt pin to PIRQ
 	 *
 	 * Since PCIe downstream ports received INTx are routed to PIRQ
-	 * A/B/C/D directly and not configurable, we route internal PCI
-	 * device's INTx to PIRQ E/F/G/H.
+	 * A/B/C/D directly and not configurable, we have to route PCIe
+	 * root ports' INTx to PIRQ A/B/C/D as well. For other devices
+	 * on TunneCreek, route them to PIRQ E/F/G/H.
 	 */
 	writew(PIRQE, &rcba->d02ir);
 	writew(PIRQF, &rcba->d03ir);
 	writew(PIRQG, &rcba->d27ir);
 	writew(PIRQH, &rcba->d31ir);
-	writew(PIRQE, &rcba->d23ir);
-	writew(PIRQF, &rcba->d24ir);
-	writew(PIRQG, &rcba->d25ir);
-	writew(PIRQH, &rcba->d26ir);
+	writew(PIRQA, &rcba->d23ir);
+	writew(PIRQB, &rcba->d24ir);
+	writew(PIRQC, &rcba->d25ir);
+	writew(PIRQD, &rcba->d26ir);
 }
 
 int arch_misc_init(void)
diff --git a/arch/x86/dts/crownbay.dts b/arch/x86/dts/crownbay.dts
index b77c65a..60da1f5 100644
--- a/arch/x86/dts/crownbay.dts
+++ b/arch/x86/dts/crownbay.dts
@@ -169,10 +169,22 @@
 				/* TunnelCreek PCI devices */
 				PCI_BDF(0, 2, 0) INTA PIRQE
 				PCI_BDF(0, 3, 0) INTA PIRQF
-				PCI_BDF(0, 23, 0) INTA PIRQE
-				PCI_BDF(0, 24, 0) INTA PIRQF
-				PCI_BDF(0, 25, 0) INTA PIRQG
-				PCI_BDF(0, 26, 0) INTA PIRQH
+				PCI_BDF(0, 23, 0) INTA PIRQA
+				PCI_BDF(0, 23, 0) INTB PIRQB
+				PCI_BDF(0, 23, 0) INTC PIRQC
+				PCI_BDF(0, 23, 0) INTD PIRQD
+				PCI_BDF(0, 24, 0) INTA PIRQB
+				PCI_BDF(0, 24, 0) INTB PIRQC
+				PCI_BDF(0, 24, 0) INTC PIRQD
+				PCI_BDF(0, 24, 0) INTD PIRQA
+				PCI_BDF(0, 25, 0) INTA PIRQC
+				PCI_BDF(0, 25, 0) INTB PIRQD
+				PCI_BDF(0, 25, 0) INTC PIRQA
+				PCI_BDF(0, 25, 0) INTD PIRQB
+				PCI_BDF(0, 26, 0) INTA PIRQD
+				PCI_BDF(0, 26, 0) INTB PIRQA
+				PCI_BDF(0, 26, 0) INTC PIRQB
+				PCI_BDF(0, 26, 0) INTD PIRQC
 				PCI_BDF(0, 27, 0) INTA PIRQG
 				/*
 				 * Topcliff PCI devices
-- 
1.8.2.1