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From: Tim Harvey <tharvey@gateworks.com>
Subject: [PATCH] PCI: imx6: add support for legacy irqs
The i.MX6 supports legacy IRQ's via 155,154,153,152. When devices
are behind a PCIe-to-PCIe switch (at least for the TI XIO2001) the
mapping is reversed from when they are behind a PCIe switch.
This patch still needs some review and clarification before going
upstream.
---
drivers/pci/host/pcie-designware.c | 21 ++++++++++++++++++++-
1 file changed, 20 insertions(+), 1 deletion(-)
--- a/drivers/pci/host/pcie-designware.c
+++ b/drivers/pci/host/pcie-designware.c
@@ -711,7 +711,26 @@ static int dw_pcie_map_irq(const struct
{
struct pcie_port *pp = sys_to_pcie(dev->bus->sysdata);
- return pp->irq;
+ /* TI XIO2001 PCIe-to-PCI bridge IRQs are flipped it seems */
+ if ( dev->bus && dev->bus->self
+ && (dev->bus->self->vendor == 0x104c)
+ && (dev->bus->self->device == 0x8240)) {
+ switch (pin) {
+ case 1: return pp->irq - 3;
+ case 2: return pp->irq - 2;
+ case 3: return pp->irq - 1;
+ case 4: return pp->irq;
+ default: return -1;
+ }
+ } else {
+ switch (pin) {
+ case 1: return pp->irq;
+ case 2: return pp->irq - 1;
+ case 3: return pp->irq - 2;
+ case 4: return pp->irq - 3;
+ default: return -1;
+ }
+ }
}
static void dw_pcie_add_bus(struct pci_bus *bus)
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