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commit 2c0d0491438433a1f327f2e754c7b6b55fec51c4
Author: Tim Harvey <tharvey@gateworks.com>
Date: Thu Feb 27 00:59:53 2014 -0800
PCI: imx6: ventana: fixup for IRQ mismapping
The TI XIO2001 PCIe-to-PCI bridge used on several Ventana expansion boards
has its slot-to-bridge IRQ mapping reversed from the PCI specification:
INTA->INTD
INTB->INTC
INTC->INTB
INTD->INTA
Implement a custom swizzle function that does a fixup on the interrupt for
devices on a TI XIO2001 bridge.
Signed-off-by: Tim Harvey <tharvey@gateworks.com>
--- a/drivers/pci/host/pci-imx6.c
+++ b/drivers/pci/host/pci-imx6.c
@@ -540,6 +540,39 @@ static int imx6_add_pcie_port(struct pci
return 0;
}
+/* TI XIO2001 PCIe-to-PCI bridge on GW16082 exp card has IRQs reversed */
+u8 ventana_swizzle(struct pci_dev *dev, u8 *pin)
+{
+ u8 i = 0;
+ struct pci_dev *pdev = dev;
+
+ /* count number of TI XIO2001 bridges on bus */
+ while (!pci_is_root_bus(pdev->bus)) {
+ if (pdev->bus && pdev->bus->self &&
+ (pdev->bus->self->vendor == PCI_VENDOR_ID_TI) &&
+ (pdev->bus->self->device == PCI_DEVICE_ID_TI_XIO2001)) {
+ i++;
+ }
+ pdev = pdev->bus->self;
+ }
+ while (!pci_is_root_bus(dev->bus)) {
+ /* if we are directly downstream from 1st TI XIO2001 bridge */
+ if (dev->bus && dev->bus->self &&
+ (dev->bus->self->vendor == PCI_VENDOR_ID_TI) &&
+ (dev->bus->self->device == PCI_DEVICE_ID_TI_XIO2001)) {
+ if (--i == 0) {
+ /* swap IRQs and swizzle backwards */
+ *pin = (15 - PCI_SLOT(dev->devfn)) + 1;
+ dev = dev->bus->self;
+ continue;
+ }
+ }
+ *pin = pci_swizzle_interrupt_pin(dev, *pin);
+ dev = dev->bus->self;
+ }
+ return PCI_SLOT(dev->devfn);
+}
+
static int __init imx6_pcie_probe(struct platform_device *pdev)
{
struct imx6_pcie *imx6_pcie;
@@ -648,6 +681,9 @@ static int __init imx6_pcie_probe(struct
return PTR_ERR(imx6_pcie->iomuxc_gpr);
}
+ if (of_machine_is_compatible("gw,ventana"))
+ pp->swizzle = ventana_swizzle;
+
ret = imx6_add_pcie_port(pp, pdev);
if (ret < 0)
return ret;
--- a/include/linux/pci_ids.h
+++ b/include/linux/pci_ids.h
@@ -822,6 +822,7 @@
#define PCI_DEVICE_ID_TI_XX12 0x8039
#define PCI_DEVICE_ID_TI_XX12_FM 0x803b
#define PCI_DEVICE_ID_TI_XIO2000A 0x8231
+#define PCI_DEVICE_ID_TI_XIO2001 0x8240
#define PCI_DEVICE_ID_TI_1130 0xac12
#define PCI_DEVICE_ID_TI_1031 0xac13
#define PCI_DEVICE_ID_TI_1131 0xac15
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