target/linux/imx6/patches-3.10/0034-PCI-imx6-add-support-for-legacy-irqs.patch

   1 From: Tim Harvey <tharvey@gateworks.com>
   2 Subject: [PATCH] PCI: imx6: add support for legacy irqs
   3
   4 The i.MX6 supports legacy IRQ's via 155,154,153,152.  When devices
   5 are behind a PCIe-to-PCIe switch (at least for the TI XIO2001) the
   6 mapping is reversed from when they are behind a PCIe switch.
   7
   8 This patch still needs some review and clarification before going
   9 upstream.
  10 ---
  11  drivers/pci/host/pcie-designware.c | 21 ++++++++++++++++++++-
  12  1 file changed, 20 insertions(+), 1 deletion(-)
  13
  14 --- a/drivers/pci/host/pcie-designware.c
  15 +++ b/drivers/pci/host/pcie-designware.c
  16 @@ -482,7 +482,26 @@ int dw_pcie_map_irq(const struct pci_dev
  17  {
  18         struct pcie_port *pp = sys_to_pcie(dev->bus->sysdata);
  19
  20 -       return pp->irq;
  21 +       /* TI XIO2001 PCIe-to-PCI bridge IRQs are flipped it seems */
  22 +       if ( dev->bus && dev->bus->self
  23 +        && (dev->bus->self->vendor == 0x104c)
  24 +        && (dev->bus->self->device == 0x8240)) {
  25 +               switch (pin) {
  26 +               case 1: return pp->irq - 3;
  27 +               case 2: return pp->irq - 2;
  28 +               case 3: return pp->irq - 1;
  29 +               case 4: return pp->irq;
  30 +               default: return -1;
  31 +               }
  32 +       } else {
  33 +               switch (pin) {
  34 +               case 1: return pp->irq;
  35 +               case 2: return pp->irq - 1;
  36 +               case 3: return pp->irq - 2;
  37 +               case 4: return pp->irq - 3;
  38 +               default: return -1;
  39 +               }
  40 +       }
  41  }
  42
  43  static struct hw_pci dw_pci = {