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PCI: Add Broadcom Northstar2 PAXC quirk for device class and MPSS

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The Broadcom Northstar2 SoC has a number of quirks for the PAXC
(internal/fake) PCI bus.  Specifically, the PCI config space is shared
between the root port and the first PF (ie., PF0), and a number of fields
are tied to zero (thus preventing them from being set).  These cannot be
"fixed" in device firmware, so we must fix them with a quirk.

Signed-off-by: Jon Mason <jon.mason@broadcom.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
This commit is contained in:
Jon Mason 2017-01-27 16:44:09 -05:00 committed by Bjorn Helgaas
parent 4d4836ab70
commit ce709f8650
1 changed files with 21 additions and 0 deletions
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21
drivers/pci/quirks.c
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@ -2239,6 +2239,27 @@ DECLARE_PCI_FIXUP_ENABLE(PCI_VENDOR_ID_BROADCOM,
PCI_DEVICE_ID_TIGON3_5719,
quirk_brcm_5719_limit_mrrs);
#ifdef CONFIG_PCIE_IPROC_PLATFORM
static void quirk_paxc_bridge(struct pci_dev *pdev)
{
/* The PCI config space is shared with the PAXC root port and the first
* Ethernet device. So, we need to workaround this by telling the PCI
* code that the bridge is not an Ethernet device.
*/
if (pdev->hdr_type == PCI_HEADER_TYPE_BRIDGE)
pdev->class = PCI_CLASS_BRIDGE_PCI << 8;
/* MPSS is not being set properly (as it is currently 0). This is
* because that area of the PCI config space is hard coded to zero, and
* is not modifiable by firmware. Set this to 2 (e.g., 512 byte MPS)
* so that the MPS can be set to the real max value.
*/
pdev->pcie_mpss = 2;
}
DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_BROADCOM, 0x16cd, quirk_paxc_bridge);
DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_BROADCOM, 0x16f0, quirk_paxc_bridge);
#endif
/* Originally in EDAC sources for i82875P:
* Intel tells BIOS developers to hide device 6 which
* configures the overflow device access containing