2013-10-30 23:31:26 +00:00
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From: Tim Harvey <tharvey@gateworks.com>
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Subject: [PATCH] PCI: imx6: add support for legacy irqs
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The i.MX6 supports legacy IRQ's via 155,154,153,152. When devices
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are behind a PCIe-to-PCIe switch (at least for the TI XIO2001) the
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mapping is reversed from when they are behind a PCIe switch.
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This patch still needs some review and clarification before going
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upstream.
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---
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drivers/pci/host/pcie-designware.c | 21 ++++++++++++++++++++-
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1 file changed, 20 insertions(+), 1 deletion(-)
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--- a/drivers/pci/host/pcie-designware.c
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+++ b/drivers/pci/host/pcie-designware.c
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2013-12-19 02:03:26 +00:00
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@@ -482,7 +482,26 @@ int dw_pcie_map_irq(const struct pci_dev
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2013-10-30 23:31:26 +00:00
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{
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struct pcie_port *pp = sys_to_pcie(dev->bus->sysdata);
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- return pp->irq;
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+ /* TI XIO2001 PCIe-to-PCI bridge IRQs are flipped it seems */
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+ if ( dev->bus && dev->bus->self
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+ && (dev->bus->self->vendor == 0x104c)
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+ && (dev->bus->self->device == 0x8240)) {
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+ switch (pin) {
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+ case 1: return pp->irq - 3;
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+ case 2: return pp->irq - 2;
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+ case 3: return pp->irq - 1;
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+ case 4: return pp->irq;
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+ default: return -1;
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+ }
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+ } else {
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+ switch (pin) {
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+ case 1: return pp->irq;
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+ case 2: return pp->irq - 1;
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+ case 3: return pp->irq - 2;
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+ case 4: return pp->irq - 3;
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+ default: return -1;
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+ }
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+ }
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}
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static struct hw_pci dw_pci = {
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