Merge branch 'pci/host/al'

  - Add Amazon Annapurna Labs PCIe host controller driver (Jonathan
    Chocron)

* pci/host/al:
  PCI: al: Add Amazon Annapurna Labs PCIe host controller driver

5 files changed, 113 insertions, 0 deletions

diff --git a/MAINTAINERS b/MAINTAINERS
index ebc2b758f28d..b3d64a7daae8 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -12015,6 +12015,12 @@ T:	git git://git.kernel.org/pub/scm/linux/kernel/git/lpieralisi/pci.git/
 S:	Supported
 F:	drivers/pci/controller/
 
+PCIE DRIVER FOR ANNAPURNA LABS
+M:	Jonathan Chocron <jonnyc@amazon.com>
+L:	linux-pci@vger.kernel.org
+S:	Maintained
+F:	drivers/pci/controller/dwc/pcie-al.c
+
 PCIE DRIVER FOR AMLOGIC MESON
 M:	Yue Wang <yue.wang@Amlogic.com>
 L:	linux-pci@vger.kernel.org
diff --git a/drivers/acpi/pci_mcfg.c b/drivers/acpi/pci_mcfg.c
index a4e8432fc2fb..b42be067fb83 100644
--- a/drivers/acpi/pci_mcfg.c
+++ b/drivers/acpi/pci_mcfg.c
@@ -52,6 +52,18 @@ struct mcfg_fixup {
 static struct mcfg_fixup mcfg_quirks[] = {
 /*	{ OEM_ID, OEM_TABLE_ID, REV, SEGMENT, BUS_RANGE, ops, cfgres }, */
 
+#define AL_ECAM(table_id, rev, seg, ops) \
+	{ "AMAZON", table_id, rev, seg, MCFG_BUS_ANY, ops }
+
+	AL_ECAM("GRAVITON", 0, 0, &al_pcie_ops),
+	AL_ECAM("GRAVITON", 0, 1, &al_pcie_ops),
+	AL_ECAM("GRAVITON", 0, 2, &al_pcie_ops),
+	AL_ECAM("GRAVITON", 0, 3, &al_pcie_ops),
+	AL_ECAM("GRAVITON", 0, 4, &al_pcie_ops),
+	AL_ECAM("GRAVITON", 0, 5, &al_pcie_ops),
+	AL_ECAM("GRAVITON", 0, 6, &al_pcie_ops),
+	AL_ECAM("GRAVITON", 0, 7, &al_pcie_ops),
+
 #define QCOM_ECAM32(seg) \
 	{ "QCOM  ", "QDF2432 ", 1, seg, MCFG_BUS_ANY, &pci_32b_ops }
 
diff --git a/drivers/pci/controller/dwc/Makefile b/drivers/pci/controller/dwc/Makefile
index b5f3b83cc2b3..b085dfd4fab7 100644
--- a/drivers/pci/controller/dwc/Makefile
+++ b/drivers/pci/controller/dwc/Makefile
@@ -28,5 +28,6 @@ obj-$(CONFIG_PCIE_UNIPHIER) += pcie-uniphier.o
 # depending on whether ACPI, the DT driver, or both are enabled.
 
 ifdef CONFIG_PCI
+obj-$(CONFIG_ARM64) += pcie-al.o
 obj-$(CONFIG_ARM64) += pcie-hisi.o
 endif
diff --git a/drivers/pci/controller/dwc/pcie-al.c b/drivers/pci/controller/dwc/pcie-al.c
new file mode 100644
index 000000000000..3ab58f0584a8
--- /dev/null
+++ b/drivers/pci/controller/dwc/pcie-al.c
@@ -0,0 +1,93 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * PCIe host controller driver for Amazon's Annapurna Labs IP (used in chips
+ * such as Graviton and Alpine)
+ *
+ * Copyright 2019 Amazon.com, Inc. or its affiliates. All Rights Reserved.
+ *
+ * Author: Jonathan Chocron <jonnyc@amazon.com>
+ */
+
+#include <linux/pci.h>
+#include <linux/pci-ecam.h>
+#include <linux/pci-acpi.h>
+#include "../../pci.h"
+
+#if defined(CONFIG_ACPI) && defined(CONFIG_PCI_QUIRKS)
+
+struct al_pcie_acpi  {
+	void __iomem *dbi_base;
+};
+
+static void __iomem *al_pcie_map_bus(struct pci_bus *bus, unsigned int devfn,
+				     int where)
+{
+	struct pci_config_window *cfg = bus->sysdata;
+	struct al_pcie_acpi *pcie = cfg->priv;
+	void __iomem *dbi_base = pcie->dbi_base;
+
+	if (bus->number == cfg->busr.start) {
+		/*
+		 * The DW PCIe core doesn't filter out transactions to other
+		 * devices/functions on the root bus num, so we do this here.
+		 */
+		if (PCI_SLOT(devfn) > 0)
+			return NULL;
+		else
+			return dbi_base + where;
+	}
+
+	return pci_ecam_map_bus(bus, devfn, where);
+}
+
+static int al_pcie_init(struct pci_config_window *cfg)
+{
+	struct device *dev = cfg->parent;
+	struct acpi_device *adev = to_acpi_device(dev);
+	struct acpi_pci_root *root = acpi_driver_data(adev);
+	struct al_pcie_acpi *al_pcie;
+	struct resource *res;
+	int ret;
+
+	al_pcie = devm_kzalloc(dev, sizeof(*al_pcie), GFP_KERNEL);
+	if (!al_pcie)
+		return -ENOMEM;
+
+	res = devm_kzalloc(dev, sizeof(*res), GFP_KERNEL);
+	if (!res)
+		return -ENOMEM;
+
+	ret = acpi_get_rc_resources(dev, "AMZN0001", root->segment, res);
+	if (ret) {
+		dev_err(dev, "can't get rc dbi base address for SEG %d\n",
+			root->segment);
+		return ret;
+	}
+
+	dev_dbg(dev, "Root port dbi res: %pR\n", res);
+
+	al_pcie->dbi_base = devm_pci_remap_cfg_resource(dev, res);
+	if (IS_ERR(al_pcie->dbi_base)) {
+		long err = PTR_ERR(al_pcie->dbi_base);
+
+		dev_err(dev, "couldn't remap dbi base %pR (err:%ld)\n",
+			res, err);
+		return err;
+	}
+
+	cfg->priv = al_pcie;
+
+	return 0;
+}
+
+struct pci_ecam_ops al_pcie_ops = {
+	.bus_shift    = 20,
+	.init         =  al_pcie_init,
+	.pci_ops      = {
+		.map_bus    = al_pcie_map_bus,
+		.read       = pci_generic_config_read,
+		.write      = pci_generic_config_write,
+	}
+};
+
+#endif /* defined(CONFIG_ACPI) && defined(CONFIG_PCI_QUIRKS) */
diff --git a/include/linux/pci-ecam.h b/include/linux/pci-ecam.h
index 29efa09d686b..a73164c85e78 100644
--- a/include/linux/pci-ecam.h
+++ b/include/linux/pci-ecam.h
@@ -56,6 +56,7 @@ extern struct pci_ecam_ops thunder_pem_ecam_ops; /* Cavium ThunderX 1.x & 2.x */
 extern struct pci_ecam_ops pci_thunder_ecam_ops; /* Cavium ThunderX 1.x */
 extern struct pci_ecam_ops xgene_v1_pcie_ecam_ops; /* APM X-Gene PCIe v1 */
 extern struct pci_ecam_ops xgene_v2_pcie_ecam_ops; /* APM X-Gene PCIe v2.x */
+extern struct pci_ecam_ops al_pcie_ops; /* Amazon Annapurna Labs PCIe */
 #endif
 
 #ifdef CONFIG_PCI_HOST_COMMON