target/linux/octeontx/patches-5.4/0004-PCI-add-quirk-for-Gateworks-PLX-PEX860x-switch-with-.patch

   1 From d0ff7a1bcfe886cab1a237895b08ac51ecfe10e7 Mon Sep 17 00:00:00 2001
   2 From: Tim Harvey <tharvey@gateworks.com>
   3 Date: Wed, 10 Apr 2019 08:00:47 -0700
   4 Subject: [PATCH 04/12] PCI: add quirk for Gateworks PLX PEX860x switch with
   5  GPIO PERST#
   6
   7 Gateworks boards use PLX PEX860x switches where downstream ports
   8 have their PERST# driven from the PEX GPIO.
   9
  10 Signed-off-by: Tim Harvey <tharvey@gateworks.com>
  11 ---
  12  drivers/pci/quirks.c | 32 ++++++++++++++++++++++++++++++++
  13  1 file changed, 32 insertions(+)
  14
  15 --- a/drivers/pci/quirks.c
  16 +++ b/drivers/pci/quirks.c
  17 @@ -25,6 +25,7 @@
  18  #include <linux/ktime.h>
  19  #include <linux/mm.h>
  20  #include <linux/nvme.h>
  21 +#include <linux/of.h>
  22  #include <linux/platform_data/x86/apple.h>
  23  #include <linux/pm_runtime.h>
  24  #include <linux/switchtec.h>
  25 @@ -5564,3 +5565,34 @@ static void apex_pci_fixup_class(struct
  26  }
  27  DECLARE_PCI_FIXUP_CLASS_HEADER(0x1ac1, 0x089a,
  28                                PCI_CLASS_NOT_DEFINED, 8, apex_pci_fixup_class);
  29 +
  30 +#ifdef CONFIG_PCI_HOST_THUNDER_PEM
  31 +/*
  32 + * fixup for PLX PEX8909 bridge to configure GPIO1-7 as output High
  33 + * as they are used for slots1-7 PERST#
  34 + */
  35 +static void newport_pciesw_early_fixup(struct pci_dev *dev)
  36 +{
  37 +       u32 dw;
  38 +
  39 +       if (!of_machine_is_compatible("gw,newport"))
  40 +               return;
  41 +
  42 +       if (dev->devfn != 0)
  43 +               return;
  44 +
  45 +       dev_info(&dev->dev, "de-asserting PERST#\n");
  46 +       pci_read_config_dword(dev, 0x62c, &dw);
  47 +       dw |= 0xaaa8; /* GPIO1-7 outputs */
  48 +       pci_write_config_dword(dev, 0x62c, dw);
  49 +
  50 +       pci_read_config_dword(dev, 0x644, &dw);
  51 +       dw |= 0xfe;   /* GPIO1-7 output high */
  52 +       pci_write_config_dword(dev, 0x644, dw);
  53 +
  54 +       msleep(100);
  55 +}
  56 +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_PLX, 0x8609, newport_pciesw_early_fixup);
  57 +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_PLX, 0x8606, newport_pciesw_early_fixup);
  58 +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_PLX, 0x8604, newport_pciesw_early_fixup);
  59 +#endif /* CONFIG_PCI_HOST_THUNDER_PEM */