[PATCH] Add Microchip/Microsemi PolarFire-SoC PCIe support

[Daire McNamara <daire.mcnamara@microchip.com>]

Hi everyone,

This patch contains changes made in order to enable support of PCIe
IP block on Microsemi PolarFire SoCs.

Feedback is welcome!

Thanks,
Daire McNamara


Signed-off-by: Daire McNamara <daire.mcnamara@microchip.com>
---
 .../bindings/pci/microsemi-pcie.txt           |  65 ++
 .../devicetree/bindings/vendor-prefixes.txt   |   1 +
 drivers/pci/controller/Kconfig                |   8 +
 drivers/pci/controller/Makefile               |   1 +
 drivers/pci/controller/pcie-microsemi.c       | 778 ++++++++++++++++++
 5 files changed, 853 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/pci/microsemi-pcie.txt
 create mode 100644 drivers/pci/controller/pcie-microsemi.c

diff --git a/Documentation/devicetree/bindings/pci/microsemi-pcie.txt b/Documentation/devicetree/bindings/pci/microsemi-pcie.txt
new file mode 100644
index 000000000000..a16e48806edc
--- /dev/null
+++ b/Documentation/devicetree/bindings/pci/microsemi-pcie.txt
@@ -0,0 +1,65 @@
+* Microsemi AXI PCIe Root Port Bridge DT description
+
+Required properties:
+- #address-cells: Address representation for root ports, set to <3>
+- #size-cells: Size representation for root ports, set to <2>
+- #interrupt-cells: specifies the number of cells needed to encode an
+	interrupt source. The value must be 1.
+- compatible: Should contain "microsemi,ms-pf-axi-pcie-host"
+- reg: Should contain AXI PCIe registers location and length
+- device_type: must be "pci"
+- interrupts: Should contain AXI PCIe interrupt
+- interrupt-map-mask,
+  interrupt-map: standard PCI properties to define the mapping of the
+	PCI interface to interrupt numbers.
+- ranges: ranges for the PCI memory regions (I/O space region is not
+	supported by hardware)
+	Please refer to the standard PCI bus binding document for a more
+	detailed explanation
+
+Optional properties for PolarFire:
+- bus-range: PCI bus numbers covered
+
+Interrupt controller child node
++++++++++++++++++++++++++++++++
+Required properties:
+- interrupt-controller: identifies the node as an interrupt controller
+- #address-cells: specifies the number of cells needed to encode an
+	address. The value must be 0.
+- #interrupt-cells: specifies the number of cells needed to encode an
+	interrupt source. The value must be 1.
+
+NOTE:
+The core provides a single interrupt for both INTx/MSI messages. So,
+create an interrupt controller node to support 'interrupt-map' DT
+functionality.  The driver will create an IRQ domain for this map, decode
+the four INTx interrupts in ISR and route them to this domain.
+
+
+Example:
+++++++++
+AloeVera:
+
+	pcie: pcie@2030000000 {
+		#address-cells = <3>;
+		#size-cells = <2>;
+		#interrupt-cells = <1>;
+		compatible = "microsemi,ms-pf-axi-pcie-host";
+		device_type = "pci";
+		bus-range = <0x01 0x7f>;
+		interrupt-map = <0 0 0 1 &pcie_intc 1>,
+				<0 0 0 2 &pcie_intc 2>,
+				<0 0 0 3 &pcie_intc 3>,
+				<0 0 0 4 &pcie_intc 4>;
+		interrupt-map-mask = <0 0 0 7>;
+		interrupt-parent = <&L4>;
+		interrupts = <32>;
+		ranges = <0x3000000 0 0x40000000 0x0 0x40000000 0x0 0x20000000>;
+		reg = <0x20 0x30000000 0x0 0x4000000 0x20 0x0 0x0 0x100000>;
+		reg-names = "control", "apb";
+		pcie_intc: interrupt-controller {
+			#address-cells = <0>;
+			#interrupt-cells = <1>;
+			interrupt-controller;
+		};
+	};
diff --git a/Documentation/devicetree/bindings/vendor-prefixes.txt b/Documentation/devicetree/bindings/vendor-prefixes.txt
index 4b1a2a8fcc16..d13f6e40dbf4 100644
--- a/Documentation/devicetree/bindings/vendor-prefixes.txt
+++ b/Documentation/devicetree/bindings/vendor-prefixes.txt
@@ -238,6 +238,7 @@ micrel	Micrel Inc.
 microchip	Microchip Technology Inc.
 microcrystal	Micro Crystal AG
 micron	Micron Technology Inc.
+microsemi	Microsemi Corporation
 mikroe		MikroElektronika d.o.o.
 minix	MINIX Technology Ltd.
 miramems	MiraMEMS Sensing Technology Co., Ltd.
diff --git a/drivers/pci/controller/Kconfig b/drivers/pci/controller/Kconfig
index 6671946dbf66..31fa5e53d765 100644
--- a/drivers/pci/controller/Kconfig
+++ b/drivers/pci/controller/Kconfig
@@ -280,5 +280,13 @@ config VMD
 	  To compile this driver as a module, choose M here: the
 	  module will be called vmd.
 
+config PCIE_MICROSEMI
+	bool "Microsemi AXI PCIe host bridge support"
+	depends on PCI_MSI && OF
+	help
+	  Say 'Y' here if you want kernel to support the Microsemi AXI PCIe
+	  Host Bridge driver.
+
+
 source "drivers/pci/controller/dwc/Kconfig"
 endmenu
diff --git a/drivers/pci/controller/Makefile b/drivers/pci/controller/Makefile
index d56a507495c5..c3b76ff221be 100644
--- a/drivers/pci/controller/Makefile
+++ b/drivers/pci/controller/Makefile
@@ -28,6 +28,7 @@ obj-$(CONFIG_PCIE_ROCKCHIP_HOST) += pcie-rockchip-host.o
 obj-$(CONFIG_PCIE_MEDIATEK) += pcie-mediatek.o
 obj-$(CONFIG_PCIE_MOBIVEIL) += pcie-mobiveil.o
 obj-$(CONFIG_PCIE_TANGO_SMP8759) += pcie-tango.o
+obj-$(CONFIG_PCIE_MICROSEMI) += pcie-microsemi.o
 obj-$(CONFIG_VMD) += vmd.o
 # pcie-hisi.o quirks are needed even without CONFIG_PCIE_DW
 obj-y				+= dwc/
diff --git a/drivers/pci/controller/pcie-microsemi.c b/drivers/pci/controller/pcie-microsemi.c
new file mode 100644
index 000000000000..3572c3e82f5c
--- /dev/null
+++ b/drivers/pci/controller/pcie-microsemi.c
@@ -0,0 +1,778 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * PCIe host controller driver for Microsemi AXI PCIe Bridge
+ *
+ * Copyright (c) 2018 - 2019 Microsemi Corporation.
+ *
+ * Based on:
+ *	pcie-rcar.c
+ *	pcie-xilinx.c
+ *	pcie-altera.c
+ */
+
+#include <linux/bitmap.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/irqdomain.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/msi.h>
+#include <linux/of_address.h>
+#include <linux/of_pci.h>
+#include <linux/of_platform.h>
+#include <linux/of_irq.h>
+#include <linux/pci.h>
+#include <linux/platform_device.h>
+
+#include "../pci.h"
+
+/* ECAM definitions */
+#define ECAM_BUS_NUM_SHIFT		20
+#define ECAM_DEV_NUM_SHIFT		12
+
+/* Number of MSI IRQs */
+#define MICROSEMI_NUM_MSI_IRQS		32
+#define MICROSEMI_NUM_MSI_IRQS_CODED	 5
+
+/* PCIe Bridge Phy and Controller Phy offsets */
+#define MICROSEMI_PCIE0_BRIDGE_ADDR	0x00004000u
+#define MICROSEMI_PCIE0_CTRL_ADDR	0x00006000u
+
+#define MICROSEMI_PCIE1_BRIDGE_ADDR	0x00008000u
+#define MICROSEMI_PCIE1_CTRL_ADDR	0x0000A000u
+
+/* PCIe Controller Phy Regs */
+#define MICROSEMI_SEC_ERROR_INT			0x28
+#define SEC_ERROR_INT_TX_RAM_SEC_ERR_INT	GENMASK(3, 0)
+#define SEC_ERROR_INT_RX_RAM_SEC_ERR_INT	GENMASK(7, 4)
+#define SEC_ERROR_INT_PCIE2AXI_RAM_SEC_ERR_INT	GENMASK(11, 8)
+#define SEC_ERROR_INT_AXI2PCIE_RAM_SEC_ERR_INT	GENMASK(15, 12)
+#define MICROSEMI_SEC_ERROR_INT_MASK		0x2c
+#define MICROSEMI_DED_ERROR_INT			0x30
+#define DED_ERROR_INT_TX_RAM_DED_ERR_INT	GENMASK(3, 0)
+#define DED_ERROR_INT_RX_RAM_DED_ERR_INT	GENMASK(7, 4)
+#define DED_ERROR_INT_PCIE2AXI_RAM_DED_ERR_INT	GENMASK(11, 8)
+#define DED_ERROR_INT_AXI2PCIE_RAM_DED_ERR_INT	GENMASK(15, 12)
+#define MICROSEMI_DED_ERROR_INT_MASK		0x34
+#define MICROSEMI_ECC_CONTROL			0x38
+#define ECC_CONTROL_AXI2PCIE_RAM_ECC_BYPASS	BIT(27)
+#define ECC_CONTROL_PCIE2AXI_RAM_ECC_BYPASS	BIT(26)
+#define ECC_CONTROL_RX_RAM_ECC_BYPASS		BIT(25)
+#define ECC_CONTROL_TX_RAM_ECC_BYPASS		BIT(24)
+#define MICROSEMI_LTSSM_STATE			0x5c
+#define MICROSEMI_LTSSM_L0_STATE		0x10
+#define MICROSEMI_PCIE_EVENT_INT		0x14c
+#define PCIE_EVENT_INT_L2_EXIT_INT		BIT(0)
+#define PCIE_EVENT_INT_HOTRST_EXIT_INT		BIT(1)
+#define PCIE_EVENT_INT_DLUP_EXIT_INT		BIT(2)
+#define PCIE_EVENT_INT_L2_EXIT_INT_MASK		BIT(16)
+#define PCIE_EVENT_INT_HOTRST_EXIT_INT_MASK	BIT(17)
+#define PCIE_EVENT_INT_DLUP_EXIT_INT_MASK	BIT(18)
+
+/* PCIe Bridge Phy Regs */
+#define MICROSEMI_PCIE_PCI_IDS_DW1		0x9c
+#define MICROSEMI_IMASK_LOCAL			0x180
+#define MICROSEMI_PCIE_LOCAL_INT_ENABLE		0x0F000000u
+#define MICROSEMI_PCI_INTS			0x0F000000u
+#define MICROSEMI_PM_MSI_INT_SHIFT		24
+#define MICROSEMI_PCIE_ENABLE_MSI		0x10000000u
+#define MICROSEMI_MSI_INT			0x10000000u
+#define MICROSEMI_MSI_INT_SHIFT			28
+#define MICROSEMI_ISTATUS_LOCAL			0x184
+#define MICROSEMI_IMASK_HOST			0x188
+#define MICROSEMI_ISTATUS_HOST			0x18c
+#define MICROSEMI_ISTATUS_MSI			0x194
+
+/* PCIe AXI slave table init defines */
+#define MICROSEMI_ATR0_AXI4_SLV0_SRCADDR_PARAM	0x800u
+#define ATR_SIZE_SHIFT				(1)
+#define ATR_IMPL_ENABLE				(1)
+#define MICROSEMI_ATR0_AXI4_SLV0_SRC_ADDR	0x804u
+#define MICROSEMI_ATR0_AXI4_SLV0_TRSL_ADDR_LSB	0x808u
+#define MICROSEMI_ATR0_AXI4_SLV0_TRSL_ADDR_UDW	0x80cu
+#define MICROSEMI_ATR0_AXI4_SLV0_TRSL_PARAM	0x810u
+#define MICROSEMI_PCIE_TX_RX_INTERFACE		0x00000000u
+#define MICROSEMI_PCIE_CONFIG_INTERFACE		0x00000001u
+
+#define MICROSEMI_ATR0_AXI4_SLV_SIZE		(32)
+
+/* PCIe Master table init defines */
+#define MICROSEMI_ATR0_PCIE_WIN0_SRCADDR_31_12	0x600u
+#define MICROSEMI_ATR0_PCIE_WIN0_SIZE		(0x1f)
+#define MICROSEMI_ATR0_PCIE_WIN0_SIZE_SHIFT	(1)
+#define MICROSEMI_ATR0_PCIE_WIN0_SRCADDR_63_32	0x604u
+
+#define MICROSEMI_MSI_MSG_ADDR			0x190u
+
+/* PCIe Config space MSI capability structure */
+#define MSI_CAP_CTRL_OFFSET		0xE0u
+#define MSI_ENABLE			(0x01u << 16)
+#define MSI_ENABLE_MULTI		(MICROSEMI_NUM_MSI_IRQS_CODED << 20)
+#define MSI_MSG_ADDR_OFFSET		0xE4u
+#define MSI_MSG_UPPER_ADDR_OFFSET	0xE8u
+#define MSI_MSG_DATA_OFFSET		0xF0u
+
+/**
+ * struct microsemi_pcie_port - PCIe port information
+ * @pcie_base_addr: IO Mapped Register Base
+ * @axi_base_addr: AMBA Mapped Register Base
+ * @irq: Interrupt number
+ * @root_busno: Root Bus number
+ * @dev: Device pointer
+ * @msi_domain: MSI IRQ domain pointer
+ * @leg_domain: Legacy IRQ domain pointer
+ * @resources: Bus Resources
+ */
+struct microsemi_pcie_port {
+	struct platform_device *pdev;
+	void __iomem *pcie_base_addr;
+	void __iomem *axi_base_addr;
+	void __iomem *bridge_base_addr;
+	void __iomem *ctrl_base_addr;
+	int bridge;
+	u32 irq;
+	u8 root_busno;
+	struct device *dev;
+	struct irq_domain *msi_domain;
+	struct irq_domain *leg_domain;
+	struct list_head resources;
+	struct mutex lock;
+};
+
+static DECLARE_BITMAP(msi_irq_in_use, MICROSEMI_NUM_MSI_IRQS);
+
+static inline u32 pcie_read(struct microsemi_pcie_port *port, u32 reg)
+{
+	return readl(port->pcie_base_addr + reg);
+}
+
+static inline void pcie_write(struct microsemi_pcie_port *port,
+			      u32 val, u32 reg)
+{
+	writel(val, port->pcie_base_addr + reg);
+}
+
+static inline bool microsemi_pcie_is_enabled(struct microsemi_pcie_port *port)
+{
+	return (readl(port->bridge_base_addr + MICROSEMI_LTSSM_STATE)
+		& MICROSEMI_LTSSM_L0_STATE) ? 1 : 0;
+}
+
+static inline void microsemi_pcie_enable(struct microsemi_pcie_port *port)
+{
+	u32 enb;
+
+	enb = readl(port->bridge_base_addr + MICROSEMI_LTSSM_STATE);
+	enb |= MICROSEMI_LTSSM_L0_STATE;
+	writel(enb, port->bridge_base_addr + MICROSEMI_LTSSM_STATE);
+}
+
+/**
+ * microsemi_pcie_valid_device - Check if a valid device is present on bus
+ * @bus: PCI Bus structure
+ * @devfn: device/function
+ *
+ * Return: 'true' on success and 'false' if invalid device is found
+ */
+static bool microsemi_pcie_valid_device(struct pci_bus *bus, unsigned int devfn)
+{
+	struct microsemi_pcie_port *port = bus->sysdata;
+
+	/* Only one device down on each root port */
+	if (bus->number == port->root_busno && devfn > 0)
+		return false;
+
+	return true;
+}
+
+/**
+ * microsemi_pcie_map_bus - Get configuration base
+ * @bus: PCI Bus structure
+ * @devfn: Device/function
+ * @where: Offset from base
+ *
+ * Return: Base address of the configuration space needed to be
+ *	 accessed.
+ */
+static void __iomem *microsemi_pcie_map_bus(struct pci_bus *bus,
+					    unsigned int devfn, int where)
+{
+	struct microsemi_pcie_port *port = bus->sysdata;
+	int relbus;
+
+	if (!microsemi_pcie_valid_device(bus, devfn))
+		return NULL;
+
+	relbus = (bus->number << ECAM_BUS_NUM_SHIFT) |
+		(devfn << ECAM_DEV_NUM_SHIFT);
+
+	return port->pcie_base_addr + relbus + where;
+}
+
+/* PCIe operations */
+static struct pci_ops microsemi_pcie_ops = {
+	.map_bus = microsemi_pcie_map_bus,
+	.read	= pci_generic_config_read,
+	.write	= pci_generic_config_write,
+};
+
+/* MSI functions */
+
+/**
+ * microsemi_pcie_destroy_msi - Free MSI number
+ * @irq: IRQ to be freed
+ */
+static void microsemi_pcie_destroy_msi(unsigned int irq)
+{
+	struct msi_desc *msi;
+	struct microsemi_pcie_port *port;
+	struct irq_data *d = irq_get_irq_data(irq);
+	irq_hw_number_t hwirq = irqd_to_hwirq(d);
+
+	if (!test_bit(hwirq, msi_irq_in_use)) {
+		msi = irq_get_msi_desc(irq);
+		port = msi_desc_to_pci_sysdata(msi);
+		dev_err(port->dev, "Trying to free unused MSI#%d\n", irq);
+	} else {
+		clear_bit(hwirq, msi_irq_in_use);
+	}
+}
+
+/**
+ * microsemi_pcie_assign_msi - Allocate MSI number
+ *
+ * Return: A valid IRQ on success and error value on failure.
+ */
+static int microsemi_pcie_assign_msi(struct microsemi_pcie_port *port)
+{
+	int pos;
+
+	mutex_lock(&port->lock);
+	pos = find_first_zero_bit(msi_irq_in_use, MICROSEMI_NUM_MSI_IRQS);
+	if (pos < MICROSEMI_NUM_MSI_IRQS)
+		set_bit(pos, msi_irq_in_use);
+	else {
+		mutex_unlock(&port->lock);
+		return -ENOSPC;
+	}
+
+	mutex_unlock(&port->lock);
+	return pos;
+}
+
+/**
+ * microsemi_msi_teardown_irq - Destroy the MSI
+ * @chip: MSI Chip descriptor
+ * @irq: MSI IRQ to destroy
+ */
+static void microsemi_msi_teardown_irq(struct msi_controller *chip,
+				       unsigned int irq)
+{
+	microsemi_pcie_destroy_msi(irq);
+	irq_dispose_mapping(irq);
+}
+
+/**
+ * microsemi_pcie_msi_setup_irq - Setup MSI request
+ * @chip: MSI chip pointer
+ * @pdev: PCIe device pointer
+ * @desc: MSI descriptor pointer
+ *
+ * Return: '0' on success and error value on failure
+ */
+static int microsemi_pcie_msi_setup_irq(struct msi_controller *chip,
+					struct pci_dev *pdev,
+					struct msi_desc *desc)
+{
+	struct microsemi_pcie_port *port = pdev->bus->sysdata;
+	unsigned int irq;
+	int hwirq;
+	struct msi_msg msg;
+
+	hwirq = microsemi_pcie_assign_msi(port);
+	if (hwirq < 0)
+		return hwirq;
+
+	irq = irq_create_mapping(port->msi_domain, hwirq);
+	if (!irq)
+		return -EINVAL;
+
+	irq_set_msi_desc(irq, desc);
+
+	msg.address_hi = upper_32_bits(MICROSEMI_MSI_MSG_ADDR);
+	msg.address_lo = lower_32_bits(MICROSEMI_MSI_MSG_ADDR);
+	msg.data = hwirq;
+
+	pci_write_msi_msg(irq, &msg);
+
+	return 0;
+}
+
+/* MSI Chip Descriptor */
+static struct msi_controller microsemi_pcie_msi_chip = {
+	.setup_irq = microsemi_pcie_msi_setup_irq,
+	.teardown_irq = microsemi_msi_teardown_irq,
+};
+
+/* HW Interrupt Chip Descriptor */
+static struct irq_chip microsemi_msi_irq_chip = {
+	.name = "Microsemi PCIe MSI",
+	.irq_enable = pci_msi_unmask_irq,
+	.irq_disable = pci_msi_mask_irq,
+	.irq_mask = pci_msi_mask_irq,
+	.irq_unmask = pci_msi_unmask_irq,
+};
+
+/**
+ * microsemi_pcie_msi_map - Set the handler for the MSI and mark IRQ as valid
+ * @domain: IRQ domain
+ * @irq: Virtual IRQ number
+ * @hwirq: HW interrupt number
+ *
+ * Return: Always returns 0.
+ */
+static int microsemi_pcie_msi_map(struct irq_domain *domain, unsigned int irq,
+				  irq_hw_number_t hwirq)
+{
+	irq_set_chip_and_handler(irq, &microsemi_msi_irq_chip,
+				 handle_simple_irq);
+	irq_set_chip_data(irq, domain->host_data);
+
+	return 0;
+}
+
+/* IRQ Domain operations */
+static const struct irq_domain_ops msi_domain_ops = {
+	.map = microsemi_pcie_msi_map,
+};
+
+/**
+ * microsemi_pcie_enable_msi - Enable MSI support
+ * @port: PCIe port information
+ */
+static void microsemi_pcie_enable_msi(struct microsemi_pcie_port *port)
+{
+	u32 cap_ctrl;
+
+	cap_ctrl = pcie_read(port, MSI_CAP_CTRL_OFFSET);
+
+	pcie_write(port, cap_ctrl | MSI_ENABLE_MULTI |
+		MSI_ENABLE, MSI_CAP_CTRL_OFFSET);
+	pcie_write(port, MICROSEMI_MSI_MSG_ADDR, MSI_MSG_ADDR_OFFSET);
+}
+
+/* INTx Functions */
+
+/**
+ * microsemi_pcie_intx_map - Set the handler for the INTx and mark IRQ as valid
+ * @domain: IRQ domain
+ * @irq: Virtual IRQ number
+ * @hwirq: HW interrupt number
+ *
+ * Return: Always returns 0.
+ */
+static int microsemi_pcie_intx_map(struct irq_domain *domain, unsigned int irq,
+				   irq_hw_number_t hwirq)
+{
+	irq_set_chip_and_handler(irq, &dummy_irq_chip, handle_simple_irq);
+	irq_set_chip_data(irq, domain->host_data);
+
+	return 0;
+}
+
+/* INTx IRQ Domain operations */
+static const struct irq_domain_ops intx_domain_ops = {
+	.map = microsemi_pcie_intx_map,
+	.xlate = pci_irqd_intx_xlate,
+};
+
+/* PCIe HW Functions */
+
+/**
+ * microsemi_pcie_intr_handler - Interrupt Service Handler
+ * @irq: IRQ number
+ * @data: PCIe port information
+ *
+ * Return: IRQ_HANDLED on success and IRQ_NONE on failure
+ */
+static irqreturn_t microsemi_pcie_intr_handler(int irq, void *data)
+{
+	struct microsemi_pcie_port *port = (struct microsemi_pcie_port *)data;
+	struct device *dev = port->dev;
+	unsigned long status;
+	unsigned long msi;
+	u32 bit;
+	u32 virq;
+
+	status = readl(port->bridge_base_addr + MICROSEMI_ISTATUS_LOCAL);
+
+	/* Might be sharing interrupt line.  Check if interrupt is for us */
+	if (!status)
+		return IRQ_NONE;
+
+	status = (status & MICROSEMI_PCI_INTS) >> MICROSEMI_PM_MSI_INT_SHIFT;
+	for_each_set_bit(bit, &status, PCI_NUM_INTX) {
+		/* clear that interrupt bit */
+		writel(1 << (bit + MICROSEMI_PM_MSI_INT_SHIFT),
+		       port->bridge_base_addr + MICROSEMI_ISTATUS_LOCAL);
+		virq = irq_find_mapping(port->leg_domain, bit);
+
+		if (virq)
+			generic_handle_irq(virq);
+		else
+			dev_err(dev, "unexpected IRQ, INT%d\n", bit);
+	}
+
+	status = readl(port->bridge_base_addr + MICROSEMI_ISTATUS_LOCAL);
+	if (status & MICROSEMI_MSI_INT) {
+		/* Clear the ISTATUS MSI bit */
+		writel((1 << MICROSEMI_MSI_INT_SHIFT),
+		       port->bridge_base_addr + MICROSEMI_ISTATUS_LOCAL);
+		msi = readl(port->bridge_base_addr + MICROSEMI_ISTATUS_MSI);
+		for_each_set_bit(bit, &msi, MICROSEMI_NUM_MSI_IRQS) {
+			/* clear that MSI interrupt bit */
+			writel((1 << bit),
+			       port->bridge_base_addr + MICROSEMI_ISTATUS_MSI);
+			virq = irq_find_mapping(port->msi_domain, bit);
+			if (virq)
+				generic_handle_irq(virq);
+			else
+				dev_err(dev, "unexpected IRQ, INT%d\n", bit);
+		}
+	}
+
+	return IRQ_HANDLED;
+}
+
+/**
+ * microsemi_pcie_init_irq_domain - Initialize IRQ domain
+ * @port: PCIe port information
+ *
+ * Return: '0' on success and error value on failure
+ */
+static int microsemi_pcie_init_irq_domain(struct microsemi_pcie_port *port)
+{
+	struct device *dev = port->dev;
+	struct device_node *node = dev->of_node;
+	struct device_node *pcie_intc_node;
+
+	/* Setup INTx */
+	pcie_intc_node = of_get_next_child(node, NULL);
+	if (!pcie_intc_node) {
+		dev_err(dev, "No PCIe Intc node found\n");
+		return -ENODEV;
+	}
+	dev_info(dev, "Intc node found %s\n", pcie_intc_node->name);
+
+	port->leg_domain = irq_domain_add_linear(pcie_intc_node, PCI_NUM_INTX,
+						 &intx_domain_ops,
+						 port);
+	if (!port->leg_domain) {
+		dev_err(dev, "Failed to get a INTx IRQ domain\n");
+		return -ENODEV;
+	}
+
+	/* Setup MSI */
+	if (IS_ENABLED(CONFIG_PCI_MSI)) {
+		port->msi_domain =
+			irq_domain_add_linear(node,
+					      MICROSEMI_NUM_MSI_IRQS,
+					      &msi_domain_ops,
+					      &microsemi_pcie_msi_chip);
+		if (!port->msi_domain) {
+			dev_err(dev, "Failed to get a MSI IRQ domain\n");
+			return -ENODEV;
+		}
+		microsemi_pcie_enable_msi(port);
+	}
+
+	/* Enable interrupts */
+	writel(MICROSEMI_PCIE_ENABLE_MSI | MICROSEMI_PCIE_LOCAL_INT_ENABLE,
+	       port->bridge_base_addr + MICROSEMI_IMASK_LOCAL);
+
+	return 0;
+}
+
+/**
+ * microsemi_pcie_init_port - Parse Device tree, Initialize hardware
+ * @port: PCIe port information
+ *
+ * Return: '0' on success and error value on failure
+ */
+static int microsemi_pcie_init_port(struct microsemi_pcie_port *port)
+{
+	struct device *dev = port->dev;
+	struct device_node *node = dev->of_node;
+	struct of_pci_range_parser parser;
+	struct of_pci_range range;
+	struct resource regs;
+	struct resource regs1;
+	resource_size_t size;
+	u32 atr_sz;
+	const char *type;
+	int err;
+	u32 val;
+	int index = 1;
+
+	type = of_get_property(node, "device_type", NULL);
+	if (!type || strcmp(type, "pci")) {
+		dev_err(dev, "invalid \"device_type\" %s\n", type);
+		return -EINVAL;
+	}
+
+	/* Only supporting bridge 1 */
+	port->bridge = 1;
+
+	mutex_init(&port->lock);
+
+	err = of_address_to_resource(node, 0, &regs);
+	if (err) {
+		dev_err(dev, "missing \"reg\" property\n");
+		return err;
+	}
+
+	port->pcie_base_addr = devm_pci_remap_cfg_resource(dev, &regs);
+	if (IS_ERR(port->pcie_base_addr))
+		return PTR_ERR(port->pcie_base_addr);
+
+	err = of_address_to_resource(node, 1, &regs1);
+	if (err) {
+		dev_err(dev, "missing \"reg\" property\n");
+		return err;
+	}
+
+	port->axi_base_addr = devm_ioremap_resource(dev, &regs1);
+	if (IS_ERR(port->axi_base_addr))
+		return PTR_ERR(port->axi_base_addr);
+
+	if (port->bridge == 0) {
+		port->bridge_base_addr = port->axi_base_addr
+			+ MICROSEMI_PCIE0_BRIDGE_ADDR;
+		port->ctrl_base_addr = port->axi_base_addr
+			+ MICROSEMI_PCIE0_CTRL_ADDR;
+	} else {
+		port->bridge_base_addr = port->axi_base_addr
+			+ MICROSEMI_PCIE1_BRIDGE_ADDR;
+		port->ctrl_base_addr = port->axi_base_addr
+			+ MICROSEMI_PCIE1_CTRL_ADDR;
+	}
+
+	port->irq = irq_of_parse_and_map(node, 0);
+
+	err = devm_request_irq(dev, port->irq, microsemi_pcie_intr_handler,
+			       IRQF_SHARED | IRQF_NO_THREAD,
+			       "microsemi-pcie", port);
+	if (err) {
+		dev_err(dev, "unable to request irq %d\n", port->irq);
+		return err;
+	}
+
+	if (!microsemi_pcie_is_enabled(port))
+		microsemi_pcie_enable(port);
+
+	/* Clear and Disable interrupts */
+	val = ECC_CONTROL_AXI2PCIE_RAM_ECC_BYPASS
+		| ECC_CONTROL_PCIE2AXI_RAM_ECC_BYPASS
+		| ECC_CONTROL_RX_RAM_ECC_BYPASS
+		| ECC_CONTROL_TX_RAM_ECC_BYPASS;
+	writel(val, port->ctrl_base_addr + MICROSEMI_ECC_CONTROL);
+
+	val = PCIE_EVENT_INT_L2_EXIT_INT
+		| PCIE_EVENT_INT_HOTRST_EXIT_INT
+		| PCIE_EVENT_INT_DLUP_EXIT_INT
+		| PCIE_EVENT_INT_L2_EXIT_INT_MASK
+		| PCIE_EVENT_INT_HOTRST_EXIT_INT_MASK
+		| PCIE_EVENT_INT_DLUP_EXIT_INT_MASK;
+	writel(val, port->ctrl_base_addr + MICROSEMI_PCIE_EVENT_INT);
+
+	val = SEC_ERROR_INT_TX_RAM_SEC_ERR_INT
+		| SEC_ERROR_INT_RX_RAM_SEC_ERR_INT
+		| SEC_ERROR_INT_PCIE2AXI_RAM_SEC_ERR_INT
+		| SEC_ERROR_INT_AXI2PCIE_RAM_SEC_ERR_INT;
+	writel(val, port->ctrl_base_addr + MICROSEMI_SEC_ERROR_INT);
+	writel(val, port->ctrl_base_addr + MICROSEMI_SEC_ERROR_INT_MASK);
+
+	val = DED_ERROR_INT_TX_RAM_DED_ERR_INT
+		| DED_ERROR_INT_RX_RAM_DED_ERR_INT
+		| DED_ERROR_INT_PCIE2AXI_RAM_DED_ERR_INT
+		| DED_ERROR_INT_AXI2PCIE_RAM_DED_ERR_INT;
+	writel(val, port->ctrl_base_addr + MICROSEMI_DED_ERROR_INT);
+	writel(val, port->ctrl_base_addr + MICROSEMI_DED_ERROR_INT_MASK);
+
+	writel(0x00000000,
+	       port->bridge_base_addr + MICROSEMI_IMASK_LOCAL);
+	writel(GENMASK(31, 0),
+	       port->bridge_base_addr + MICROSEMI_ISTATUS_LOCAL);
+	writel(0x00000000, port->bridge_base_addr + MICROSEMI_IMASK_HOST);
+	writel(GENMASK(31, 0), port->bridge_base_addr + MICROSEMI_ISTATUS_HOST);
+
+	dev_info(dev, "interrupt disabled\n");
+
+	/* Configure Address Translation Table 0 for PCIe config space */
+	writel(MICROSEMI_PCIE_CONFIG_INTERFACE,
+	       port->bridge_base_addr + MICROSEMI_ATR0_AXI4_SLV0_TRSL_PARAM);
+
+	size = resource_size(&regs);
+
+	atr_sz = find_first_bit((const unsigned long *)&size, 64) - 1;
+
+	writel(lower_32_bits(regs.start)
+		| atr_sz << ATR_SIZE_SHIFT | ATR_IMPL_ENABLE,
+		port->bridge_base_addr
+		+ MICROSEMI_ATR0_AXI4_SLV0_SRCADDR_PARAM);
+
+	writel(lower_32_bits(regs.start),
+	       port->bridge_base_addr + MICROSEMI_ATR0_AXI4_SLV0_TRSL_ADDR_LSB);
+
+	if (of_pci_range_parser_init(&parser, node)) {
+		dev_err(dev, "missing \"ranges\" property\n");
+		return -EINVAL;
+	}
+
+	for_each_of_pci_range(&parser, &range) {
+		switch (range.flags & IORESOURCE_TYPE_BITS) {
+		case IORESOURCE_MEM:
+			size = range.size;
+			atr_sz =
+				find_first_bit((const unsigned long *)&size, 64)
+				- 1;
+
+			/* Configure Address Translation Table index for PCIe
+			 * mem space
+			 */
+			writel(MICROSEMI_PCIE_TX_RX_INTERFACE,
+			       port->bridge_base_addr
+				+ (index * MICROSEMI_ATR0_AXI4_SLV_SIZE)
+				+ MICROSEMI_ATR0_AXI4_SLV0_TRSL_PARAM);
+
+			writel(lower_32_bits(range.cpu_addr)
+				| (atr_sz << ATR_SIZE_SHIFT)
+				| ATR_IMPL_ENABLE,
+				port->bridge_base_addr
+				+ (index * MICROSEMI_ATR0_AXI4_SLV_SIZE)
+				+ MICROSEMI_ATR0_AXI4_SLV0_SRCADDR_PARAM);
+
+			writel(lower_32_bits(range.pci_addr),
+			       port->bridge_base_addr
+				+ (index * MICROSEMI_ATR0_AXI4_SLV_SIZE)
+				+ MICROSEMI_ATR0_AXI4_SLV0_TRSL_ADDR_LSB);
+
+			break;
+		}
+		index++;
+	}
+
+	writel(readl(port->bridge_base_addr
+		+ MICROSEMI_ATR0_PCIE_WIN0_SRCADDR_31_12)
+		| (MICROSEMI_ATR0_PCIE_WIN0_SIZE
+		<< MICROSEMI_ATR0_PCIE_WIN0_SIZE_SHIFT),
+		port->bridge_base_addr +
+		MICROSEMI_ATR0_PCIE_WIN0_SRCADDR_31_12);
+
+	writel(0x0,
+	       port->bridge_base_addr + MICROSEMI_ATR0_PCIE_WIN0_SRCADDR_63_32);
+
+	writel((readl(port->bridge_base_addr + MICROSEMI_PCIE_PCI_IDS_DW1)
+		& 0xffff)
+		| (PCI_CLASS_BRIDGE_PCI << 16),
+		port->bridge_base_addr + MICROSEMI_PCIE_PCI_IDS_DW1);
+
+	return 0;
+}
+
+/**
+ * microsemi_pcie_probe - Probe function
+ * @pdev: Platform device pointer
+ *
+ * Return: '0' on success and error value on failure
+ */
+static int microsemi_pcie_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct microsemi_pcie_port *port;
+	struct pci_bus *bus, *child;
+	struct pci_host_bridge *bridge;
+	int err;
+	resource_size_t iobase = 0;
+	LIST_HEAD(res);
+
+	if (!dev->of_node)
+		return -ENODEV;
+
+	bridge = devm_pci_alloc_host_bridge(dev, sizeof(*port));
+	if (!bridge)
+		return -ENODEV;
+
+	port = pci_host_bridge_priv(bridge);
+
+	port->dev = dev;
+	port->pdev = pdev;
+
+	err = microsemi_pcie_init_port(port);
+	if (err) {
+		dev_err(dev, "PCIe port initialization failed\n");
+		return err;
+	}
+
+	err = microsemi_pcie_init_irq_domain(port);
+	if (err) {
+		dev_err(dev, "Failed creating IRQ Domain\n");
+		return err;
+	}
+
+	err = devm_of_pci_get_host_bridge_resources(dev, 0, 0xff, &res,
+						    &iobase);
+	if (err) {
+		dev_err(dev, "Getting bridge resources failed\n");
+		return err;
+	}
+
+	err = devm_request_pci_bus_resources(dev, &res);
+	if (err)
+		goto error;
+
+	list_splice_init(&res, &bridge->windows);
+	bridge->dev.parent = dev;
+	bridge->sysdata = port;
+	bridge->busnr = 0;
+	bridge->ops = &microsemi_pcie_ops;
+	bridge->map_irq = of_irq_parse_and_map_pci;
+	bridge->swizzle_irq = pci_common_swizzle;
+
+#ifdef CONFIG_PCI_MSI
+	microsemi_pcie_msi_chip.dev = dev;
+	bridge->msi = &microsemi_pcie_msi_chip;
+#endif
+	err = pci_scan_root_bus_bridge(bridge);
+	dev_info(dev, "pci_scan_root_bus_bridge done\n");
+	if (err < 0)
+		goto error;
+
+	bus = bridge->bus;
+
+	pci_assign_unassigned_bus_resources(bus);
+	list_for_each_entry(child, &bus->children, node)
+		pcie_bus_configure_settings(child);
+	pci_bus_add_devices(bus);
+
+	return 0;
+
+error:
+	pci_free_resource_list(&res);
+	return err;
+}
+
+static const struct of_device_id microsemi_pcie_of_match[] = {
+	{ .compatible = "microsemi,ms-pf-axi-pcie-host", },
+	{}
+};
+
+static struct platform_driver microsemi_pcie_driver = {
+	.driver = {
+		.name = "microsemi-pcie",
+		.of_match_table = microsemi_pcie_of_match,
+		.suppress_bind_attrs = true,
+	},
+	.probe = microsemi_pcie_probe,
+};
+builtin_platform_driver(microsemi_pcie_driver);
-- 
2.17.1