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- From d0ff7a1bcfe886cab1a237895b08ac51ecfe10e7 Mon Sep 17 00:00:00 2001
- From: Tim Harvey <[email protected]>
- Date: Wed, 10 Apr 2019 08:00:47 -0700
- Subject: [PATCH 04/12] PCI: add quirk for Gateworks PLX PEX860x switch with
- GPIO PERST#
- Gateworks boards use PLX PEX860x switches where downstream ports
- have their PERST# driven from the PEX GPIO.
- Signed-off-by: Tim Harvey <[email protected]>
- ---
- drivers/pci/quirks.c | 32 ++++++++++++++++++++++++++++++++
- 1 file changed, 32 insertions(+)
- --- a/drivers/pci/quirks.c
- +++ b/drivers/pci/quirks.c
- @@ -25,6 +25,7 @@
- #include <linux/ktime.h>
- #include <linux/mm.h>
- #include <linux/nvme.h>
- +#include <linux/of.h>
- #include <linux/platform_data/x86/apple.h>
- #include <linux/pm_runtime.h>
- #include <linux/suspend.h>
- @@ -5856,3 +5857,34 @@ static void nvidia_ion_ahci_fixup(struct
- pdev->dev_flags |= PCI_DEV_FLAGS_HAS_MSI_MASKING;
- }
- DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_NVIDIA, 0x0ab8, nvidia_ion_ahci_fixup);
- +
- +#ifdef CONFIG_PCI_HOST_THUNDER_PEM
- +/*
- + * fixup for PLX PEX8909 bridge to configure GPIO1-7 as output High
- + * as they are used for slots1-7 PERST#
- + */
- +static void newport_pciesw_early_fixup(struct pci_dev *dev)
- +{
- + u32 dw;
- +
- + if (!of_machine_is_compatible("gw,newport"))
- + return;
- +
- + if (dev->devfn != 0)
- + return;
- +
- + dev_info(&dev->dev, "de-asserting PERST#\n");
- + pci_read_config_dword(dev, 0x62c, &dw);
- + dw |= 0xaaa8; /* GPIO1-7 outputs */
- + pci_write_config_dword(dev, 0x62c, dw);
- +
- + pci_read_config_dword(dev, 0x644, &dw);
- + dw |= 0xfe; /* GPIO1-7 output high */
- + pci_write_config_dword(dev, 0x644, dw);
- +
- + msleep(100);
- +}
- +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_PLX, 0x8609, newport_pciesw_early_fixup);
- +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_PLX, 0x8606, newport_pciesw_early_fixup);
- +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_PLX, 0x8604, newport_pciesw_early_fixup);
- +#endif /* CONFIG_PCI_HOST_THUNDER_PEM */
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