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Message-Id: <1442529694-1792-3-git-send-email-ddaney.cavm@gmail.com>
Date: Thu, 17 Sep 2015 15:41:33 -0700
From: David Daney <ddaney.cavm@...il.com>
To: linux-kernel@...r.kernel.org, Bjorn Helgaas <bhelgaas@...gle.com>,
linux-pci@...r.kernel.org, Will Deacon <will.deacon@....com>,
Rob Herring <robh+dt@...nel.org>,
Pawel Moll <pawel.moll@....com>,
Mark Rutland <mark.rutland@....com>,
Ian Campbell <ijc+devicetree@...lion.org.uk>,
Kumar Gala <galak@...eaurora.org>,
linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
Marc Zyngier <marc.zyngier@....com>
Cc: David Daney <david.daney@...ium.com>
Subject: [PATCH 2/3] PCI: Add quirks for devices found on Cavium ThunderX SoCs.
From: David Daney <david.daney@...ium.com>
The on-chip devices all have fixed bars. So, fix them up.
Signed-off-by: David Daney <david.daney@...ium.com>
---
drivers/pci/host/Kconfig | 6 +++
drivers/pci/host/Makefile | 1 +
drivers/pci/host/quirks-thunder.c | 95 +++++++++++++++++++++++++++++++++++++++
3 files changed, 102 insertions(+)
create mode 100644 drivers/pci/host/quirks-thunder.c
diff --git a/drivers/pci/host/Kconfig b/drivers/pci/host/Kconfig
index d5e58ba..20d700d 100644
--- a/drivers/pci/host/Kconfig
+++ b/drivers/pci/host/Kconfig
@@ -145,4 +145,10 @@ config PCIE_IPROC_BCMA
Say Y here if you want to use the Broadcom iProc PCIe controller
through the BCMA bus interface
+config PCI_QUIRKS_THUNDER
+ bool "PCI quirks for Cavium ThunderX SoCs"
+ depends on ARM64
+ help
+ Say Y here to support ThunderX SoCs
+
endmenu
diff --git a/drivers/pci/host/Makefile b/drivers/pci/host/Makefile
index 140d66f..3ce7456 100644
--- a/drivers/pci/host/Makefile
+++ b/drivers/pci/host/Makefile
@@ -17,3 +17,4 @@ obj-$(CONFIG_PCI_VERSATILE) += pci-versatile.o
obj-$(CONFIG_PCIE_IPROC) += pcie-iproc.o
obj-$(CONFIG_PCIE_IPROC_PLATFORM) += pcie-iproc-platform.o
obj-$(CONFIG_PCIE_IPROC_BCMA) += pcie-iproc-bcma.o
+obj-$(CONFIG_PCI_QUIRKS_THUNDER) += quirks-thunder.o
diff --git a/drivers/pci/host/quirks-thunder.c b/drivers/pci/host/quirks-thunder.c
new file mode 100644
index 0000000..d615fd8
--- /dev/null
+++ b/drivers/pci/host/quirks-thunder.c
@@ -0,0 +1,95 @@
+/*
+ * PCIe quirks for Cavium Thunder SOC
+ *
+ * Copyright (C) 2014, 2015 Cavium Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ */
+
+#include <linux/module.h>
+#include <linux/pci.h>
+
+#define PCI_DEVICE_ID_THUNDER_BRIDGE 0xa002
+
+/*
+ * All PCIe devices in Thunder have fixed resources, shouldn't be
+ * reassigned.
+ */
+static void thunder_pci_fixup_header(struct pci_dev *dev)
+{
+ int resno;
+
+ /* Only fixup Thunder on-chip devices. */
+ if ((dev->device & 0xff00) != 0xa000)
+ return;
+
+ for (resno = 0; resno < PCI_NUM_RESOURCES; resno++)
+ if (dev->resource[resno].flags)
+ dev->resource[resno].flags |= IORESOURCE_PCI_FIXED;
+#ifdef CONFIG_PCI_IOV
+ if (dev->device == 0xa01e) {
+ dev->resource[PCI_IOV_RESOURCES + 0] = dev->resource[0];
+ dev->resource[PCI_IOV_RESOURCES + 0].start += 0xa0000000;
+ dev->resource[PCI_IOV_RESOURCES + 0].end =
+ dev->resource[PCI_IOV_RESOURCES + 0].start + 0x200000 - 1;
+ dev->resource[PCI_IOV_RESOURCES + 4] = dev->resource[0];
+ dev->resource[PCI_IOV_RESOURCES + 4].start += 0xe0000000;
+ dev->resource[PCI_IOV_RESOURCES + 4].end =
+ dev->resource[PCI_IOV_RESOURCES + 4].start + 0x200000 - 1;
+ }
+#endif
+}
+DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_CAVIUM, PCI_ANY_ID, thunder_pci_fixup_header);
+
+static void thunder_pci_fixup_final(struct pci_dev *dev)
+{
+ struct resource *res;
+ int resno;
+
+ /* Only fixup Thunder on-chip devices. */
+ if ((dev->device & 0xff00) != 0xa000)
+ return;
+
+ if (dev->device == PCI_DEVICE_ID_THUNDER_BRIDGE) {
+ /*
+ * This bridge is just for the sake of supporting ARI
+ * for downstream devices. No resources are attached
+ * to it. Copy upstream root bus resources to bridge
+ * which aide in resource claiming for downstream
+ * devices
+ */
+
+ struct pci_bus *bus;
+ int resno;
+
+ bus = dev->subordinate;
+ for (resno = 0; resno < PCI_BRIDGE_RESOURCE_NUM; resno++) {
+ bus->resource[resno] = pci_bus_resource_n(bus->parent,
+ PCI_BRIDGE_RESOURCE_NUM + resno);
+ }
+
+ for (resno = PCI_BRIDGE_RESOURCES;
+ resno <= PCI_BRIDGE_RESOURCE_END; resno++) {
+ dev->resource[resno].start = dev->resource[resno].end = 0;
+ dev->resource[resno].flags = 0;
+ }
+ } else {
+ /*
+ * Claim the device's valid resources to set
+ * 'res->parent' hierarchy.
+ */
+ for (resno = 0; resno < PCI_BRIDGE_RESOURCES; resno++) {
+ res = &dev->resource[resno];
+ if (res->parent || !(res->flags & IORESOURCE_MEM))
+ continue;
+ pci_claim_resource(dev, resno);
+ }
+ }
+}
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_CAVIUM, PCI_ANY_ID, thunder_pci_fixup_final);
+
+MODULE_DESCRIPTION("PCI quirks for Cavium Thunder ECAM based devices");
+MODULE_LICENSE("GPL v2");
--
1.9.1
--
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