Cisco Network Processing Unit: disable unused PCIe BARs (sonic-net#248)

For Cisco ASIC only BAR0 is valid. Not disabling other BARs
was resulting in pci_enable_device function failure in P0
Pacific ASIC's. Further debugging and consultation with Hardware
team, issue seems to be related to only P0 version of ASIC and
workaround suggested is to disable unused PCI BAR.

This is same pull request reviewed ealier,
sonic-net/sonic-linux-kernel#225

Cisco experimented removing this patch, but identified that
there are boards in the field with Pacific ASIC.

This patch is need for these ASIC's to work, hence re-submitting.

Signed-off-by: Madhava Reddy Siddareddygari <msiddare@cisco.com>

patch/cisco-npu-disable-other-bars.patch

@@ -0,0 +1,77 @@
+From 5b025a4732297147ec5c264225e1ffb50a09bfe5 Mon Sep 17 00:00:00 2001
+From: Madhava Reddy Siddareddygari <msiddare@cisco.com>
+Date: Wed, 1 Dec 2021 13:59:29 -0800
+Subject: [PATCH] NPU disable unused PCI BAR's
+
+For Cisco Network Processing Unit ASIC only BAR0 is valid.
+Not disabling other BAR's was resulting in pci_enable_device
+function failure in P0 Pacific ASIC's. Further debugging and
+consultion with Hardware team, issue seems to be related to
+only P0 version of ASIC and workaround suggested is to disable
+unused PCI BAR.
+
+This patch disables unused PCI BAR of NPU ASIC.
+
+NPU is commonly used name for the packet forwarding ASIC's.
+
+Signed-off-by: Madhava Reddy Siddareddygari <msiddare@cisco.com>
+---
+ drivers/pci/quirks.c | 45 ++++++++++++++++++++++++++++++++++++++++++++
+ 1 file changed, 45 insertions(+)
+
+diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
+index 16fb3d771..0efe3f62a 100644
+--- a/drivers/pci/quirks.c
++++ b/drivers/pci/quirks.c
+@@ -5686,3 +5686,48 @@ static void apex_pci_fixup_class(struct pci_dev *pdev)
+ }
+ DECLARE_PCI_FIXUP_CLASS_HEADER(0x1ac1, 0x089a,
+ 			       PCI_CLASS_NOT_DEFINED, 8, apex_pci_fixup_class);
++
++#define PCI_DEVICE_ID_LEABA_PACIFIC    0xabcd
++#define PCI_DEVICE_ID_LEABA_GIBRALTAR  0xa001
++#define PCI_DEVICE_ID_LEABA_GRAPHENE   0xa003
++#define PCI_DEVICE_ID_LEABA_PALLADIUM  0xa004
++#define PCI_DEVICE_ID_LEABA_ARGON      0xa005
++#define PCI_DEVICE_ID_LEABA_KRYPTON    0xa006
++
++/*
++ * For Pacific A0, only BAR 0 is valid
++ */
++static void silicon_one_fixup(struct pci_dev *dev)
++{
++	int i;
++	struct resource *r;
++
++	for (i = 1; i <= PCI_ROM_RESOURCE; i++) {
++		r = &dev->resource[i];
++		if (!r->start && !r->end && !r->flags)
++			continue;
++
++		pci_info(dev, "Cisco Silicon One BAR %d %pR fixed up\n", i, r);
++		r->start = 0;
++		r->end = 0;
++		r->flags = 0;
++	}
++
++	dev->class = PCI_CLASS_MEMORY_OTHER << 8;
++	pci_info(dev, "Cisco Silicon One class adjusted\n");
++}
++DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_SYNOPSYS, PCI_DEVICE_ID_LEABA_PACIFIC,
++				silicon_one_fixup);
++DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_CISCO, PCI_DEVICE_ID_LEABA_PACIFIC,
++				silicon_one_fixup);
++DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_CISCO, PCI_DEVICE_ID_LEABA_GIBRALTAR,
++				silicon_one_fixup);
++DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_CISCO, PCI_DEVICE_ID_LEABA_GRAPHENE,
++				silicon_one_fixup);
++DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_CISCO, PCI_DEVICE_ID_LEABA_PALLADIUM,
++				silicon_one_fixup);
++DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_CISCO, PCI_DEVICE_ID_LEABA_ARGON,
++				silicon_one_fixup);
++DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_CISCO, PCI_DEVICE_ID_LEABA_KRYPTON,
++				silicon_one_fixup);
++
+-- 
+2.25.1
+

patch/series

@@ -96,6 +96,7 @@ cisco-mdio-mux-support-acpi.patch
 cisco-x86-gpio-config.patch
 cisco-acpi-spi-nor.patch
 cisco-Enable-static-memory-reservation-for-OIRable-PCIe-de.patch
+cisco-npu-disable-other-bars.patch
 
 #
 # Marvell platform patches for 4.19