[PATCH][Artful] UBUNTU: SAUCE: PCI: Vulcan: AHCI PCI bar fix for Broadcom Vulcan early silicon

[dann frazier]

From: Ashok Kumar Sekar <asekar at redhat.com>

BugLink: https://bugs.launchpad.net/bugs/1718760

PCI BAR 5 is not setup correctly for the on-board AHCI
controller on Broadcom's Vulcan processor. Added a quirk to fix BAR 5
by using BAR 4's resources which are populated correctly but NOT used
by the AHCI controller actually.

Signed-off-by: Ashok Kumar Sekar <asekar at redhat.com>
Signed-off-by: Jayachandran C <jchandra at broadcom.com>
Signed-off-by: Robert Richter <rrichter at cavium.com>
[ dannf: *** There is no need to carry this forward beyond artful *** ]
Signed-off-by: dann frazier <dann.frazier at canonical.com>
---
 drivers/pci/quirks.c | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index b7832fd4dbf4..73bad58d587a 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -4009,6 +4009,30 @@ DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_BROADCOM, 0x9000,
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_BROADCOM, 0x9084,
 				quirk_bridge_cavm_thrx2_pcie_root);
 
+/*
+ * PCI BAR 5 is not setup correctly for the on-board AHCI controller
+ * on Broadcom's Vulcan processor. Added a quirk to fix BAR 5 by
+ * using BAR 4's resources which are populated correctly and NOT
+ * actually used by the AHCI controller.
+ */
+static void quirk_fix_vulcan_ahci_bars(struct pci_dev *dev)
+{
+	struct resource *r =  &dev->resource[4];
+
+	if (!(r->flags & IORESOURCE_MEM) || (r->start == 0))
+		return;
+
+	/* Set BAR5 resource to BAR4 */
+	dev->resource[5] = *r;
+
+	/* Update BAR5 in pci config space */
+	pci_write_config_dword(dev, PCI_BASE_ADDRESS_5, r->start);
+
+	/* Clear BAR4's resource */
+	memset(r, 0, sizeof(*r));
+}
+DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_BROADCOM, 0x9027, quirk_fix_vulcan_ahci_bars);
+
 /*
  * Intersil/Techwell TW686[4589]-based video capture cards have an empty (zero)
  * class code.  Fix it.
-- 
2.14.1