Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1338 insertions, 0 deletions

diff --git a/drivers/pci/controller/dwc/pci-keystone.c b/drivers/pci/controller/dwc/pci-keystone.c
new file mode 100644
index 0000000000..cf38365613
--- /dev/null
+++ b/drivers/pci/controller/dwc/pci-keystone.c
@@ -0,0 +1,1338 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * PCIe host controller driver for Texas Instruments Keystone SoCs
+ *
+ * Copyright (C) 2013-2014 Texas Instruments., Ltd.
+ *		https://www.ti.com
+ *
+ * Author: Murali Karicheri <m-karicheri2@ti.com>
+ * Implementation based on pci-exynos.c and pcie-designware.c
+ */
+
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/gpio/consumer.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/irqchip/chained_irq.h>
+#include <linux/irqdomain.h>
+#include <linux/mfd/syscon.h>
+#include <linux/msi.h>
+#include <linux/of.h>
+#include <linux/of_irq.h>
+#include <linux/of_pci.h>
+#include <linux/phy/phy.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/resource.h>
+#include <linux/signal.h>
+
+#include "../../pci.h"
+#include "pcie-designware.h"
+
+#define PCIE_VENDORID_MASK	0xffff
+#define PCIE_DEVICEID_SHIFT	16
+
+/* Application registers */
+#define CMD_STATUS			0x004
+#define LTSSM_EN_VAL		        BIT(0)
+#define OB_XLAT_EN_VAL		        BIT(1)
+#define DBI_CS2				BIT(5)
+
+#define CFG_SETUP			0x008
+#define CFG_BUS(x)			(((x) & 0xff) << 16)
+#define CFG_DEVICE(x)			(((x) & 0x1f) << 8)
+#define CFG_FUNC(x)			((x) & 0x7)
+#define CFG_TYPE1			BIT(24)
+
+#define OB_SIZE				0x030
+#define OB_OFFSET_INDEX(n)		(0x200 + (8 * (n)))
+#define OB_OFFSET_HI(n)			(0x204 + (8 * (n)))
+#define OB_ENABLEN			BIT(0)
+#define OB_WIN_SIZE			8	/* 8MB */
+
+#define PCIE_LEGACY_IRQ_ENABLE_SET(n)	(0x188 + (0x10 * ((n) - 1)))
+#define PCIE_LEGACY_IRQ_ENABLE_CLR(n)	(0x18c + (0x10 * ((n) - 1)))
+#define PCIE_EP_IRQ_SET			0x64
+#define PCIE_EP_IRQ_CLR			0x68
+#define INT_ENABLE			BIT(0)
+
+/* IRQ register defines */
+#define IRQ_EOI				0x050
+
+#define MSI_IRQ				0x054
+#define MSI_IRQ_STATUS(n)		(0x104 + ((n) << 4))
+#define MSI_IRQ_ENABLE_SET(n)		(0x108 + ((n) << 4))
+#define MSI_IRQ_ENABLE_CLR(n)		(0x10c + ((n) << 4))
+#define MSI_IRQ_OFFSET			4
+
+#define IRQ_STATUS(n)			(0x184 + ((n) << 4))
+#define IRQ_ENABLE_SET(n)		(0x188 + ((n) << 4))
+#define INTx_EN				BIT(0)
+
+#define ERR_IRQ_STATUS			0x1c4
+#define ERR_IRQ_ENABLE_SET		0x1c8
+#define ERR_AER				BIT(5)	/* ECRC error */
+#define AM6_ERR_AER			BIT(4)	/* AM6 ECRC error */
+#define ERR_AXI				BIT(4)	/* AXI tag lookup fatal error */
+#define ERR_CORR			BIT(3)	/* Correctable error */
+#define ERR_NONFATAL			BIT(2)	/* Non-fatal error */
+#define ERR_FATAL			BIT(1)	/* Fatal error */
+#define ERR_SYS				BIT(0)	/* System error */
+#define ERR_IRQ_ALL			(ERR_AER | ERR_AXI | ERR_CORR | \
+					 ERR_NONFATAL | ERR_FATAL | ERR_SYS)
+
+/* PCIE controller device IDs */
+#define PCIE_RC_K2HK			0xb008
+#define PCIE_RC_K2E			0xb009
+#define PCIE_RC_K2L			0xb00a
+#define PCIE_RC_K2G			0xb00b
+
+#define KS_PCIE_DEV_TYPE_MASK		(0x3 << 1)
+#define KS_PCIE_DEV_TYPE(mode)		((mode) << 1)
+
+#define EP				0x0
+#define LEG_EP				0x1
+#define RC				0x2
+
+#define KS_PCIE_SYSCLOCKOUTEN		BIT(0)
+
+#define AM654_PCIE_DEV_TYPE_MASK	0x3
+#define AM654_WIN_SIZE			SZ_64K
+
+#define APP_ADDR_SPACE_0		(16 * SZ_1K)
+
+#define to_keystone_pcie(x)		dev_get_drvdata((x)->dev)
+
+struct ks_pcie_of_data {
+	enum dw_pcie_device_mode mode;
+	const struct dw_pcie_host_ops *host_ops;
+	const struct dw_pcie_ep_ops *ep_ops;
+	u32 version;
+};
+
+struct keystone_pcie {
+	struct dw_pcie		*pci;
+	/* PCI Device ID */
+	u32			device_id;
+	int			legacy_host_irqs[PCI_NUM_INTX];
+	struct			device_node *legacy_intc_np;
+
+	int			msi_host_irq;
+	int			num_lanes;
+	u32			num_viewport;
+	struct phy		**phy;
+	struct device_link	**link;
+	struct			device_node *msi_intc_np;
+	struct irq_domain	*legacy_irq_domain;
+	struct device_node	*np;
+
+	/* Application register space */
+	void __iomem		*va_app_base;	/* DT 1st resource */
+	struct resource		app;
+	bool			is_am6;
+};
+
+static u32 ks_pcie_app_readl(struct keystone_pcie *ks_pcie, u32 offset)
+{
+	return readl(ks_pcie->va_app_base + offset);
+}
+
+static void ks_pcie_app_writel(struct keystone_pcie *ks_pcie, u32 offset,
+			       u32 val)
+{
+	writel(val, ks_pcie->va_app_base + offset);
+}
+
+static void ks_pcie_msi_irq_ack(struct irq_data *data)
+{
+	struct dw_pcie_rp *pp  = irq_data_get_irq_chip_data(data);
+	struct keystone_pcie *ks_pcie;
+	u32 irq = data->hwirq;
+	struct dw_pcie *pci;
+	u32 reg_offset;
+	u32 bit_pos;
+
+	pci = to_dw_pcie_from_pp(pp);
+	ks_pcie = to_keystone_pcie(pci);
+
+	reg_offset = irq % 8;
+	bit_pos = irq >> 3;
+
+	ks_pcie_app_writel(ks_pcie, MSI_IRQ_STATUS(reg_offset),
+			   BIT(bit_pos));
+	ks_pcie_app_writel(ks_pcie, IRQ_EOI, reg_offset + MSI_IRQ_OFFSET);
+}
+
+static void ks_pcie_compose_msi_msg(struct irq_data *data, struct msi_msg *msg)
+{
+	struct dw_pcie_rp *pp = irq_data_get_irq_chip_data(data);
+	struct keystone_pcie *ks_pcie;
+	struct dw_pcie *pci;
+	u64 msi_target;
+
+	pci = to_dw_pcie_from_pp(pp);
+	ks_pcie = to_keystone_pcie(pci);
+
+	msi_target = ks_pcie->app.start + MSI_IRQ;
+	msg->address_lo = lower_32_bits(msi_target);
+	msg->address_hi = upper_32_bits(msi_target);
+	msg->data = data->hwirq;
+
+	dev_dbg(pci->dev, "msi#%d address_hi %#x address_lo %#x\n",
+		(int)data->hwirq, msg->address_hi, msg->address_lo);
+}
+
+static int ks_pcie_msi_set_affinity(struct irq_data *irq_data,
+				    const struct cpumask *mask, bool force)
+{
+	return -EINVAL;
+}
+
+static void ks_pcie_msi_mask(struct irq_data *data)
+{
+	struct dw_pcie_rp *pp = irq_data_get_irq_chip_data(data);
+	struct keystone_pcie *ks_pcie;
+	u32 irq = data->hwirq;
+	struct dw_pcie *pci;
+	unsigned long flags;
+	u32 reg_offset;
+	u32 bit_pos;
+
+	raw_spin_lock_irqsave(&pp->lock, flags);
+
+	pci = to_dw_pcie_from_pp(pp);
+	ks_pcie = to_keystone_pcie(pci);
+
+	reg_offset = irq % 8;
+	bit_pos = irq >> 3;
+
+	ks_pcie_app_writel(ks_pcie, MSI_IRQ_ENABLE_CLR(reg_offset),
+			   BIT(bit_pos));
+
+	raw_spin_unlock_irqrestore(&pp->lock, flags);
+}
+
+static void ks_pcie_msi_unmask(struct irq_data *data)
+{
+	struct dw_pcie_rp *pp = irq_data_get_irq_chip_data(data);
+	struct keystone_pcie *ks_pcie;
+	u32 irq = data->hwirq;
+	struct dw_pcie *pci;
+	unsigned long flags;
+	u32 reg_offset;
+	u32 bit_pos;
+
+	raw_spin_lock_irqsave(&pp->lock, flags);
+
+	pci = to_dw_pcie_from_pp(pp);
+	ks_pcie = to_keystone_pcie(pci);
+
+	reg_offset = irq % 8;
+	bit_pos = irq >> 3;
+
+	ks_pcie_app_writel(ks_pcie, MSI_IRQ_ENABLE_SET(reg_offset),
+			   BIT(bit_pos));
+
+	raw_spin_unlock_irqrestore(&pp->lock, flags);
+}
+
+static struct irq_chip ks_pcie_msi_irq_chip = {
+	.name = "KEYSTONE-PCI-MSI",
+	.irq_ack = ks_pcie_msi_irq_ack,
+	.irq_compose_msi_msg = ks_pcie_compose_msi_msg,
+	.irq_set_affinity = ks_pcie_msi_set_affinity,
+	.irq_mask = ks_pcie_msi_mask,
+	.irq_unmask = ks_pcie_msi_unmask,
+};
+
+static int ks_pcie_msi_host_init(struct dw_pcie_rp *pp)
+{
+	pp->msi_irq_chip = &ks_pcie_msi_irq_chip;
+	return dw_pcie_allocate_domains(pp);
+}
+
+static void ks_pcie_handle_legacy_irq(struct keystone_pcie *ks_pcie,
+				      int offset)
+{
+	struct dw_pcie *pci = ks_pcie->pci;
+	struct device *dev = pci->dev;
+	u32 pending;
+
+	pending = ks_pcie_app_readl(ks_pcie, IRQ_STATUS(offset));
+
+	if (BIT(0) & pending) {
+		dev_dbg(dev, ": irq: irq_offset %d", offset);
+		generic_handle_domain_irq(ks_pcie->legacy_irq_domain, offset);
+	}
+
+	/* EOI the INTx interrupt */
+	ks_pcie_app_writel(ks_pcie, IRQ_EOI, offset);
+}
+
+static void ks_pcie_enable_error_irq(struct keystone_pcie *ks_pcie)
+{
+	ks_pcie_app_writel(ks_pcie, ERR_IRQ_ENABLE_SET, ERR_IRQ_ALL);
+}
+
+static irqreturn_t ks_pcie_handle_error_irq(struct keystone_pcie *ks_pcie)
+{
+	u32 reg;
+	struct device *dev = ks_pcie->pci->dev;
+
+	reg = ks_pcie_app_readl(ks_pcie, ERR_IRQ_STATUS);
+	if (!reg)
+		return IRQ_NONE;
+
+	if (reg & ERR_SYS)
+		dev_err(dev, "System Error\n");
+
+	if (reg & ERR_FATAL)
+		dev_err(dev, "Fatal Error\n");
+
+	if (reg & ERR_NONFATAL)
+		dev_dbg(dev, "Non Fatal Error\n");
+
+	if (reg & ERR_CORR)
+		dev_dbg(dev, "Correctable Error\n");
+
+	if (!ks_pcie->is_am6 && (reg & ERR_AXI))
+		dev_err(dev, "AXI tag lookup fatal Error\n");
+
+	if (reg & ERR_AER || (ks_pcie->is_am6 && (reg & AM6_ERR_AER)))
+		dev_err(dev, "ECRC Error\n");
+
+	ks_pcie_app_writel(ks_pcie, ERR_IRQ_STATUS, reg);
+
+	return IRQ_HANDLED;
+}
+
+static void ks_pcie_ack_legacy_irq(struct irq_data *d)
+{
+}
+
+static void ks_pcie_mask_legacy_irq(struct irq_data *d)
+{
+}
+
+static void ks_pcie_unmask_legacy_irq(struct irq_data *d)
+{
+}
+
+static struct irq_chip ks_pcie_legacy_irq_chip = {
+	.name = "Keystone-PCI-Legacy-IRQ",
+	.irq_ack = ks_pcie_ack_legacy_irq,
+	.irq_mask = ks_pcie_mask_legacy_irq,
+	.irq_unmask = ks_pcie_unmask_legacy_irq,
+};
+
+static int ks_pcie_init_legacy_irq_map(struct irq_domain *d,
+				       unsigned int irq,
+				       irq_hw_number_t hw_irq)
+{
+	irq_set_chip_and_handler(irq, &ks_pcie_legacy_irq_chip,
+				 handle_level_irq);
+	irq_set_chip_data(irq, d->host_data);
+
+	return 0;
+}
+
+static const struct irq_domain_ops ks_pcie_legacy_irq_domain_ops = {
+	.map = ks_pcie_init_legacy_irq_map,
+	.xlate = irq_domain_xlate_onetwocell,
+};
+
+/**
+ * ks_pcie_set_dbi_mode() - Set DBI mode to access overlaid BAR mask registers
+ * @ks_pcie: A pointer to the keystone_pcie structure which holds the KeyStone
+ *	     PCIe host controller driver information.
+ *
+ * Since modification of dbi_cs2 involves different clock domain, read the
+ * status back to ensure the transition is complete.
+ */
+static void ks_pcie_set_dbi_mode(struct keystone_pcie *ks_pcie)
+{
+	u32 val;
+
+	val = ks_pcie_app_readl(ks_pcie, CMD_STATUS);
+	val |= DBI_CS2;
+	ks_pcie_app_writel(ks_pcie, CMD_STATUS, val);
+
+	do {
+		val = ks_pcie_app_readl(ks_pcie, CMD_STATUS);
+	} while (!(val & DBI_CS2));
+}
+
+/**
+ * ks_pcie_clear_dbi_mode() - Disable DBI mode
+ * @ks_pcie: A pointer to the keystone_pcie structure which holds the KeyStone
+ *	     PCIe host controller driver information.
+ *
+ * Since modification of dbi_cs2 involves different clock domain, read the
+ * status back to ensure the transition is complete.
+ */
+static void ks_pcie_clear_dbi_mode(struct keystone_pcie *ks_pcie)
+{
+	u32 val;
+
+	val = ks_pcie_app_readl(ks_pcie, CMD_STATUS);
+	val &= ~DBI_CS2;
+	ks_pcie_app_writel(ks_pcie, CMD_STATUS, val);
+
+	do {
+		val = ks_pcie_app_readl(ks_pcie, CMD_STATUS);
+	} while (val & DBI_CS2);
+}
+
+static void ks_pcie_setup_rc_app_regs(struct keystone_pcie *ks_pcie)
+{
+	u32 val;
+	u32 num_viewport = ks_pcie->num_viewport;
+	struct dw_pcie *pci = ks_pcie->pci;
+	struct dw_pcie_rp *pp = &pci->pp;
+	u64 start, end;
+	struct resource *mem;
+	int i;
+
+	mem = resource_list_first_type(&pp->bridge->windows, IORESOURCE_MEM)->res;
+	start = mem->start;
+	end = mem->end;
+
+	/* Disable BARs for inbound access */
+	ks_pcie_set_dbi_mode(ks_pcie);
+	dw_pcie_writel_dbi(pci, PCI_BASE_ADDRESS_0, 0);
+	dw_pcie_writel_dbi(pci, PCI_BASE_ADDRESS_1, 0);
+	ks_pcie_clear_dbi_mode(ks_pcie);
+
+	if (ks_pcie->is_am6)
+		return;
+
+	val = ilog2(OB_WIN_SIZE);
+	ks_pcie_app_writel(ks_pcie, OB_SIZE, val);
+
+	/* Using Direct 1:1 mapping of RC <-> PCI memory space */
+	for (i = 0; i < num_viewport && (start < end); i++) {
+		ks_pcie_app_writel(ks_pcie, OB_OFFSET_INDEX(i),
+				   lower_32_bits(start) | OB_ENABLEN);
+		ks_pcie_app_writel(ks_pcie, OB_OFFSET_HI(i),
+				   upper_32_bits(start));
+		start += OB_WIN_SIZE * SZ_1M;
+	}
+
+	val = ks_pcie_app_readl(ks_pcie, CMD_STATUS);
+	val |= OB_XLAT_EN_VAL;
+	ks_pcie_app_writel(ks_pcie, CMD_STATUS, val);
+}
+
+static void __iomem *ks_pcie_other_map_bus(struct pci_bus *bus,
+					   unsigned int devfn, int where)
+{
+	struct dw_pcie_rp *pp = bus->sysdata;
+	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
+	struct keystone_pcie *ks_pcie = to_keystone_pcie(pci);
+	u32 reg;
+
+	reg = CFG_BUS(bus->number) | CFG_DEVICE(PCI_SLOT(devfn)) |
+		CFG_FUNC(PCI_FUNC(devfn));
+	if (!pci_is_root_bus(bus->parent))
+		reg |= CFG_TYPE1;
+	ks_pcie_app_writel(ks_pcie, CFG_SETUP, reg);
+
+	return pp->va_cfg0_base + where;
+}
+
+static struct pci_ops ks_child_pcie_ops = {
+	.map_bus = ks_pcie_other_map_bus,
+	.read = pci_generic_config_read,
+	.write = pci_generic_config_write,
+};
+
+/**
+ * ks_pcie_v3_65_add_bus() - keystone add_bus post initialization
+ * @bus: A pointer to the PCI bus structure.
+ *
+ * This sets BAR0 to enable inbound access for MSI_IRQ register
+ */
+static int ks_pcie_v3_65_add_bus(struct pci_bus *bus)
+{
+	struct dw_pcie_rp *pp = bus->sysdata;
+	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
+	struct keystone_pcie *ks_pcie = to_keystone_pcie(pci);
+
+	if (!pci_is_root_bus(bus))
+		return 0;
+
+	/* Configure and set up BAR0 */
+	ks_pcie_set_dbi_mode(ks_pcie);
+
+	/* Enable BAR0 */
+	dw_pcie_writel_dbi(pci, PCI_BASE_ADDRESS_0, 1);
+	dw_pcie_writel_dbi(pci, PCI_BASE_ADDRESS_0, SZ_4K - 1);
+
+	ks_pcie_clear_dbi_mode(ks_pcie);
+
+	 /*
+	  * For BAR0, just setting bus address for inbound writes (MSI) should
+	  * be sufficient.  Use physical address to avoid any conflicts.
+	  */
+	dw_pcie_writel_dbi(pci, PCI_BASE_ADDRESS_0, ks_pcie->app.start);
+
+	return 0;
+}
+
+static struct pci_ops ks_pcie_ops = {
+	.map_bus = dw_pcie_own_conf_map_bus,
+	.read = pci_generic_config_read,
+	.write = pci_generic_config_write,
+	.add_bus = ks_pcie_v3_65_add_bus,
+};
+
+/**
+ * ks_pcie_link_up() - Check if link up
+ * @pci: A pointer to the dw_pcie structure which holds the DesignWare PCIe host
+ *	 controller driver information.
+ */
+static int ks_pcie_link_up(struct dw_pcie *pci)
+{
+	u32 val;
+
+	val = dw_pcie_readl_dbi(pci, PCIE_PORT_DEBUG0);
+	val &= PORT_LOGIC_LTSSM_STATE_MASK;
+	return (val == PORT_LOGIC_LTSSM_STATE_L0);
+}
+
+static void ks_pcie_stop_link(struct dw_pcie *pci)
+{
+	struct keystone_pcie *ks_pcie = to_keystone_pcie(pci);
+	u32 val;
+
+	/* Disable Link training */
+	val = ks_pcie_app_readl(ks_pcie, CMD_STATUS);
+	val &= ~LTSSM_EN_VAL;
+	ks_pcie_app_writel(ks_pcie, CMD_STATUS, val);
+}
+
+static int ks_pcie_start_link(struct dw_pcie *pci)
+{
+	struct keystone_pcie *ks_pcie = to_keystone_pcie(pci);
+	u32 val;
+
+	/* Initiate Link Training */
+	val = ks_pcie_app_readl(ks_pcie, CMD_STATUS);
+	ks_pcie_app_writel(ks_pcie, CMD_STATUS, LTSSM_EN_VAL | val);
+
+	return 0;
+}
+
+static void ks_pcie_quirk(struct pci_dev *dev)
+{
+	struct pci_bus *bus = dev->bus;
+	struct pci_dev *bridge;
+	static const struct pci_device_id rc_pci_devids[] = {
+		{ PCI_DEVICE(PCI_VENDOR_ID_TI, PCIE_RC_K2HK),
+		 .class = PCI_CLASS_BRIDGE_PCI_NORMAL, .class_mask = ~0, },
+		{ PCI_DEVICE(PCI_VENDOR_ID_TI, PCIE_RC_K2E),
+		 .class = PCI_CLASS_BRIDGE_PCI_NORMAL, .class_mask = ~0, },
+		{ PCI_DEVICE(PCI_VENDOR_ID_TI, PCIE_RC_K2L),
+		 .class = PCI_CLASS_BRIDGE_PCI_NORMAL, .class_mask = ~0, },
+		{ PCI_DEVICE(PCI_VENDOR_ID_TI, PCIE_RC_K2G),
+		 .class = PCI_CLASS_BRIDGE_PCI_NORMAL, .class_mask = ~0, },
+		{ 0, },
+	};
+
+	if (pci_is_root_bus(bus))
+		bridge = dev;
+
+	/* look for the host bridge */
+	while (!pci_is_root_bus(bus)) {
+		bridge = bus->self;
+		bus = bus->parent;
+	}
+
+	if (!bridge)
+		return;
+
+	/*
+	 * Keystone PCI controller has a h/w limitation of
+	 * 256 bytes maximum read request size.  It can't handle
+	 * anything higher than this.  So force this limit on
+	 * all downstream devices.
+	 */
+	if (pci_match_id(rc_pci_devids, bridge)) {
+		if (pcie_get_readrq(dev) > 256) {
+			dev_info(&dev->dev, "limiting MRRS to 256\n");
+			pcie_set_readrq(dev, 256);
+		}
+	}
+}
+DECLARE_PCI_FIXUP_ENABLE(PCI_ANY_ID, PCI_ANY_ID, ks_pcie_quirk);
+
+static void ks_pcie_msi_irq_handler(struct irq_desc *desc)
+{
+	unsigned int irq = desc->irq_data.hwirq;
+	struct keystone_pcie *ks_pcie = irq_desc_get_handler_data(desc);
+	u32 offset = irq - ks_pcie->msi_host_irq;
+	struct dw_pcie *pci = ks_pcie->pci;
+	struct dw_pcie_rp *pp = &pci->pp;
+	struct device *dev = pci->dev;
+	struct irq_chip *chip = irq_desc_get_chip(desc);
+	u32 vector, reg, pos;
+
+	dev_dbg(dev, "%s, irq %d\n", __func__, irq);
+
+	/*
+	 * The chained irq handler installation would have replaced normal
+	 * interrupt driver handler so we need to take care of mask/unmask and
+	 * ack operation.
+	 */
+	chained_irq_enter(chip, desc);
+
+	reg = ks_pcie_app_readl(ks_pcie, MSI_IRQ_STATUS(offset));
+	/*
+	 * MSI0 status bit 0-3 shows vectors 0, 8, 16, 24, MSI1 status bit
+	 * shows 1, 9, 17, 25 and so forth
+	 */
+	for (pos = 0; pos < 4; pos++) {
+		if (!(reg & BIT(pos)))
+			continue;
+
+		vector = offset + (pos << 3);
+		dev_dbg(dev, "irq: bit %d, vector %d\n", pos, vector);
+		generic_handle_domain_irq(pp->irq_domain, vector);
+	}
+
+	chained_irq_exit(chip, desc);
+}
+
+/**
+ * ks_pcie_legacy_irq_handler() - Handle legacy interrupt
+ * @desc: Pointer to irq descriptor
+ *
+ * Traverse through pending legacy interrupts and invoke handler for each. Also
+ * takes care of interrupt controller level mask/ack operation.
+ */
+static void ks_pcie_legacy_irq_handler(struct irq_desc *desc)
+{
+	unsigned int irq = irq_desc_get_irq(desc);
+	struct keystone_pcie *ks_pcie = irq_desc_get_handler_data(desc);
+	struct dw_pcie *pci = ks_pcie->pci;
+	struct device *dev = pci->dev;
+	u32 irq_offset = irq - ks_pcie->legacy_host_irqs[0];
+	struct irq_chip *chip = irq_desc_get_chip(desc);
+
+	dev_dbg(dev, ": Handling legacy irq %d\n", irq);
+
+	/*
+	 * The chained irq handler installation would have replaced normal
+	 * interrupt driver handler so we need to take care of mask/unmask and
+	 * ack operation.
+	 */
+	chained_irq_enter(chip, desc);
+	ks_pcie_handle_legacy_irq(ks_pcie, irq_offset);
+	chained_irq_exit(chip, desc);
+}
+
+static int ks_pcie_config_msi_irq(struct keystone_pcie *ks_pcie)
+{
+	struct device *dev = ks_pcie->pci->dev;
+	struct device_node *np = ks_pcie->np;
+	struct device_node *intc_np;
+	struct irq_data *irq_data;
+	int irq_count, irq, ret, i;
+
+	if (!IS_ENABLED(CONFIG_PCI_MSI))
+		return 0;
+
+	intc_np = of_get_child_by_name(np, "msi-interrupt-controller");
+	if (!intc_np) {
+		if (ks_pcie->is_am6)
+			return 0;
+		dev_warn(dev, "msi-interrupt-controller node is absent\n");
+		return -EINVAL;
+	}
+
+	irq_count = of_irq_count(intc_np);
+	if (!irq_count) {
+		dev_err(dev, "No IRQ entries in msi-interrupt-controller\n");
+		ret = -EINVAL;
+		goto err;
+	}
+
+	for (i = 0; i < irq_count; i++) {
+		irq = irq_of_parse_and_map(intc_np, i);
+		if (!irq) {
+			ret = -EINVAL;
+			goto err;
+		}
+
+		if (!ks_pcie->msi_host_irq) {
+			irq_data = irq_get_irq_data(irq);
+			if (!irq_data) {
+				ret = -EINVAL;
+				goto err;
+			}
+			ks_pcie->msi_host_irq = irq_data->hwirq;
+		}
+
+		irq_set_chained_handler_and_data(irq, ks_pcie_msi_irq_handler,
+						 ks_pcie);
+	}
+
+	of_node_put(intc_np);
+	return 0;
+
+err:
+	of_node_put(intc_np);
+	return ret;
+}
+
+static int ks_pcie_config_legacy_irq(struct keystone_pcie *ks_pcie)
+{
+	struct device *dev = ks_pcie->pci->dev;
+	struct irq_domain *legacy_irq_domain;
+	struct device_node *np = ks_pcie->np;
+	struct device_node *intc_np;
+	int irq_count, irq, ret = 0, i;
+
+	intc_np = of_get_child_by_name(np, "legacy-interrupt-controller");
+	if (!intc_np) {
+		/*
+		 * Since legacy interrupts are modeled as edge-interrupts in
+		 * AM6, keep it disabled for now.
+		 */
+		if (ks_pcie->is_am6)
+			return 0;
+		dev_warn(dev, "legacy-interrupt-controller node is absent\n");
+		return -EINVAL;
+	}
+
+	irq_count = of_irq_count(intc_np);
+	if (!irq_count) {
+		dev_err(dev, "No IRQ entries in legacy-interrupt-controller\n");
+		ret = -EINVAL;
+		goto err;
+	}
+
+	for (i = 0; i < irq_count; i++) {
+		irq = irq_of_parse_and_map(intc_np, i);
+		if (!irq) {
+			ret = -EINVAL;
+			goto err;
+		}
+		ks_pcie->legacy_host_irqs[i] = irq;
+
+		irq_set_chained_handler_and_data(irq,
+						 ks_pcie_legacy_irq_handler,
+						 ks_pcie);
+	}
+
+	legacy_irq_domain =
+		irq_domain_add_linear(intc_np, PCI_NUM_INTX,
+				      &ks_pcie_legacy_irq_domain_ops, NULL);
+	if (!legacy_irq_domain) {
+		dev_err(dev, "Failed to add irq domain for legacy irqs\n");
+		ret = -EINVAL;
+		goto err;
+	}
+	ks_pcie->legacy_irq_domain = legacy_irq_domain;
+
+	for (i = 0; i < PCI_NUM_INTX; i++)
+		ks_pcie_app_writel(ks_pcie, IRQ_ENABLE_SET(i), INTx_EN);
+
+err:
+	of_node_put(intc_np);
+	return ret;
+}
+
+#ifdef CONFIG_ARM
+/*
+ * When a PCI device does not exist during config cycles, keystone host
+ * gets a bus error instead of returning 0xffffffff (PCI_ERROR_RESPONSE).
+ * This handler always returns 0 for this kind of fault.
+ */
+static int ks_pcie_fault(unsigned long addr, unsigned int fsr,
+			 struct pt_regs *regs)
+{
+	unsigned long instr = *(unsigned long *) instruction_pointer(regs);
+
+	if ((instr & 0x0e100090) == 0x00100090) {
+		int reg = (instr >> 12) & 15;
+
+		regs->uregs[reg] = -1;
+		regs->ARM_pc += 4;
+	}
+
+	return 0;
+}
+#endif
+
+static int __init ks_pcie_init_id(struct keystone_pcie *ks_pcie)
+{
+	int ret;
+	unsigned int id;
+	struct regmap *devctrl_regs;
+	struct dw_pcie *pci = ks_pcie->pci;
+	struct device *dev = pci->dev;
+	struct device_node *np = dev->of_node;
+	struct of_phandle_args args;
+	unsigned int offset = 0;
+
+	devctrl_regs = syscon_regmap_lookup_by_phandle(np, "ti,syscon-pcie-id");
+	if (IS_ERR(devctrl_regs))
+		return PTR_ERR(devctrl_regs);
+
+	/* Do not error out to maintain old DT compatibility */
+	ret = of_parse_phandle_with_fixed_args(np, "ti,syscon-pcie-id", 1, 0, &args);
+	if (!ret)
+		offset = args.args[0];
+
+	ret = regmap_read(devctrl_regs, offset, &id);
+	if (ret)
+		return ret;
+
+	dw_pcie_dbi_ro_wr_en(pci);
+	dw_pcie_writew_dbi(pci, PCI_VENDOR_ID, id & PCIE_VENDORID_MASK);
+	dw_pcie_writew_dbi(pci, PCI_DEVICE_ID, id >> PCIE_DEVICEID_SHIFT);
+	dw_pcie_dbi_ro_wr_dis(pci);
+
+	return 0;
+}
+
+static int __init ks_pcie_host_init(struct dw_pcie_rp *pp)
+{
+	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
+	struct keystone_pcie *ks_pcie = to_keystone_pcie(pci);
+	int ret;
+
+	pp->bridge->ops = &ks_pcie_ops;
+	if (!ks_pcie->is_am6)
+		pp->bridge->child_ops = &ks_child_pcie_ops;
+
+	ret = ks_pcie_config_legacy_irq(ks_pcie);
+	if (ret)
+		return ret;
+
+	ret = ks_pcie_config_msi_irq(ks_pcie);
+	if (ret)
+		return ret;
+
+	ks_pcie_stop_link(pci);
+	ks_pcie_setup_rc_app_regs(ks_pcie);
+	writew(PCI_IO_RANGE_TYPE_32 | (PCI_IO_RANGE_TYPE_32 << 8),
+			pci->dbi_base + PCI_IO_BASE);
+
+	ret = ks_pcie_init_id(ks_pcie);
+	if (ret < 0)
+		return ret;
+
+#ifdef CONFIG_ARM
+	/*
+	 * PCIe access errors that result into OCP errors are caught by ARM as
+	 * "External aborts"
+	 */
+	hook_fault_code(17, ks_pcie_fault, SIGBUS, 0,
+			"Asynchronous external abort");
+#endif
+
+	return 0;
+}
+
+static const struct dw_pcie_host_ops ks_pcie_host_ops = {
+	.host_init = ks_pcie_host_init,
+	.msi_host_init = ks_pcie_msi_host_init,
+};
+
+static const struct dw_pcie_host_ops ks_pcie_am654_host_ops = {
+	.host_init = ks_pcie_host_init,
+};
+
+static irqreturn_t ks_pcie_err_irq_handler(int irq, void *priv)
+{
+	struct keystone_pcie *ks_pcie = priv;
+
+	return ks_pcie_handle_error_irq(ks_pcie);
+}
+
+static void ks_pcie_am654_write_dbi2(struct dw_pcie *pci, void __iomem *base,
+				     u32 reg, size_t size, u32 val)
+{
+	struct keystone_pcie *ks_pcie = to_keystone_pcie(pci);
+
+	ks_pcie_set_dbi_mode(ks_pcie);
+	dw_pcie_write(base + reg, size, val);
+	ks_pcie_clear_dbi_mode(ks_pcie);
+}
+
+static const struct dw_pcie_ops ks_pcie_dw_pcie_ops = {
+	.start_link = ks_pcie_start_link,
+	.stop_link = ks_pcie_stop_link,
+	.link_up = ks_pcie_link_up,
+	.write_dbi2 = ks_pcie_am654_write_dbi2,
+};
+
+static void ks_pcie_am654_ep_init(struct dw_pcie_ep *ep)
+{
+	struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
+	int flags;
+
+	ep->page_size = AM654_WIN_SIZE;
+	flags = PCI_BASE_ADDRESS_SPACE_MEMORY | PCI_BASE_ADDRESS_MEM_TYPE_32;
+	dw_pcie_writel_dbi2(pci, PCI_BASE_ADDRESS_0, APP_ADDR_SPACE_0 - 1);
+	dw_pcie_writel_dbi(pci, PCI_BASE_ADDRESS_0, flags);
+}
+
+static void ks_pcie_am654_raise_legacy_irq(struct keystone_pcie *ks_pcie)
+{
+	struct dw_pcie *pci = ks_pcie->pci;
+	u8 int_pin;
+
+	int_pin = dw_pcie_readb_dbi(pci, PCI_INTERRUPT_PIN);
+	if (int_pin == 0 || int_pin > 4)
+		return;
+
+	ks_pcie_app_writel(ks_pcie, PCIE_LEGACY_IRQ_ENABLE_SET(int_pin),
+			   INT_ENABLE);
+	ks_pcie_app_writel(ks_pcie, PCIE_EP_IRQ_SET, INT_ENABLE);
+	mdelay(1);
+	ks_pcie_app_writel(ks_pcie, PCIE_EP_IRQ_CLR, INT_ENABLE);
+	ks_pcie_app_writel(ks_pcie, PCIE_LEGACY_IRQ_ENABLE_CLR(int_pin),
+			   INT_ENABLE);
+}
+
+static int ks_pcie_am654_raise_irq(struct dw_pcie_ep *ep, u8 func_no,
+				   enum pci_epc_irq_type type,
+				   u16 interrupt_num)
+{
+	struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
+	struct keystone_pcie *ks_pcie = to_keystone_pcie(pci);
+
+	switch (type) {
+	case PCI_EPC_IRQ_LEGACY:
+		ks_pcie_am654_raise_legacy_irq(ks_pcie);
+		break;
+	case PCI_EPC_IRQ_MSI:
+		dw_pcie_ep_raise_msi_irq(ep, func_no, interrupt_num);
+		break;
+	case PCI_EPC_IRQ_MSIX:
+		dw_pcie_ep_raise_msix_irq(ep, func_no, interrupt_num);
+		break;
+	default:
+		dev_err(pci->dev, "UNKNOWN IRQ type\n");
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static const struct pci_epc_features ks_pcie_am654_epc_features = {
+	.linkup_notifier = false,
+	.msi_capable = true,
+	.msix_capable = true,
+	.reserved_bar = 1 << BAR_0 | 1 << BAR_1,
+	.bar_fixed_64bit = 1 << BAR_0,
+	.bar_fixed_size[2] = SZ_1M,
+	.bar_fixed_size[3] = SZ_64K,
+	.bar_fixed_size[4] = 256,
+	.bar_fixed_size[5] = SZ_1M,
+	.align = SZ_1M,
+};
+
+static const struct pci_epc_features*
+ks_pcie_am654_get_features(struct dw_pcie_ep *ep)
+{
+	return &ks_pcie_am654_epc_features;
+}
+
+static const struct dw_pcie_ep_ops ks_pcie_am654_ep_ops = {
+	.ep_init = ks_pcie_am654_ep_init,
+	.raise_irq = ks_pcie_am654_raise_irq,
+	.get_features = &ks_pcie_am654_get_features,
+};
+
+static void ks_pcie_disable_phy(struct keystone_pcie *ks_pcie)
+{
+	int num_lanes = ks_pcie->num_lanes;
+
+	while (num_lanes--) {
+		phy_power_off(ks_pcie->phy[num_lanes]);
+		phy_exit(ks_pcie->phy[num_lanes]);
+	}
+}
+
+static int ks_pcie_enable_phy(struct keystone_pcie *ks_pcie)
+{
+	int i;
+	int ret;
+	int num_lanes = ks_pcie->num_lanes;
+
+	for (i = 0; i < num_lanes; i++) {
+		ret = phy_reset(ks_pcie->phy[i]);
+		if (ret < 0)
+			goto err_phy;
+
+		ret = phy_init(ks_pcie->phy[i]);
+		if (ret < 0)
+			goto err_phy;
+
+		ret = phy_power_on(ks_pcie->phy[i]);
+		if (ret < 0) {
+			phy_exit(ks_pcie->phy[i]);
+			goto err_phy;
+		}
+	}
+
+	return 0;
+
+err_phy:
+	while (--i >= 0) {
+		phy_power_off(ks_pcie->phy[i]);
+		phy_exit(ks_pcie->phy[i]);
+	}
+
+	return ret;
+}
+
+static int ks_pcie_set_mode(struct device *dev)
+{
+	struct device_node *np = dev->of_node;
+	struct of_phandle_args args;
+	unsigned int offset = 0;
+	struct regmap *syscon;
+	u32 val;
+	u32 mask;
+	int ret = 0;
+
+	syscon = syscon_regmap_lookup_by_phandle(np, "ti,syscon-pcie-mode");
+	if (IS_ERR(syscon))
+		return 0;
+
+	/* Do not error out to maintain old DT compatibility */
+	ret = of_parse_phandle_with_fixed_args(np, "ti,syscon-pcie-mode", 1, 0, &args);
+	if (!ret)
+		offset = args.args[0];
+
+	mask = KS_PCIE_DEV_TYPE_MASK | KS_PCIE_SYSCLOCKOUTEN;
+	val = KS_PCIE_DEV_TYPE(RC) | KS_PCIE_SYSCLOCKOUTEN;
+
+	ret = regmap_update_bits(syscon, offset, mask, val);
+	if (ret) {
+		dev_err(dev, "failed to set pcie mode\n");
+		return ret;
+	}
+
+	return 0;
+}
+
+static int ks_pcie_am654_set_mode(struct device *dev,
+				  enum dw_pcie_device_mode mode)
+{
+	struct device_node *np = dev->of_node;
+	struct of_phandle_args args;
+	unsigned int offset = 0;
+	struct regmap *syscon;
+	u32 val;
+	u32 mask;
+	int ret = 0;
+
+	syscon = syscon_regmap_lookup_by_phandle(np, "ti,syscon-pcie-mode");
+	if (IS_ERR(syscon))
+		return 0;
+
+	/* Do not error out to maintain old DT compatibility */
+	ret = of_parse_phandle_with_fixed_args(np, "ti,syscon-pcie-mode", 1, 0, &args);
+	if (!ret)
+		offset = args.args[0];
+
+	mask = AM654_PCIE_DEV_TYPE_MASK;
+
+	switch (mode) {
+	case DW_PCIE_RC_TYPE:
+		val = RC;
+		break;
+	case DW_PCIE_EP_TYPE:
+		val = EP;
+		break;
+	default:
+		dev_err(dev, "INVALID device type %d\n", mode);
+		return -EINVAL;
+	}
+
+	ret = regmap_update_bits(syscon, offset, mask, val);
+	if (ret) {
+		dev_err(dev, "failed to set pcie mode\n");
+		return ret;
+	}
+
+	return 0;
+}
+
+static const struct ks_pcie_of_data ks_pcie_rc_of_data = {
+	.host_ops = &ks_pcie_host_ops,
+	.version = DW_PCIE_VER_365A,
+};
+
+static const struct ks_pcie_of_data ks_pcie_am654_rc_of_data = {
+	.host_ops = &ks_pcie_am654_host_ops,
+	.mode = DW_PCIE_RC_TYPE,
+	.version = DW_PCIE_VER_490A,
+};
+
+static const struct ks_pcie_of_data ks_pcie_am654_ep_of_data = {
+	.ep_ops = &ks_pcie_am654_ep_ops,
+	.mode = DW_PCIE_EP_TYPE,
+	.version = DW_PCIE_VER_490A,
+};
+
+static const struct of_device_id ks_pcie_of_match[] = {
+	{
+		.type = "pci",
+		.data = &ks_pcie_rc_of_data,
+		.compatible = "ti,keystone-pcie",
+	},
+	{
+		.data = &ks_pcie_am654_rc_of_data,
+		.compatible = "ti,am654-pcie-rc",
+	},
+	{
+		.data = &ks_pcie_am654_ep_of_data,
+		.compatible = "ti,am654-pcie-ep",
+	},
+	{ },
+};
+
+static int ks_pcie_probe(struct platform_device *pdev)
+{
+	const struct dw_pcie_host_ops *host_ops;
+	const struct dw_pcie_ep_ops *ep_ops;
+	struct device *dev = &pdev->dev;
+	struct device_node *np = dev->of_node;
+	const struct ks_pcie_of_data *data;
+	enum dw_pcie_device_mode mode;
+	struct dw_pcie *pci;
+	struct keystone_pcie *ks_pcie;
+	struct device_link **link;
+	struct gpio_desc *gpiod;
+	struct resource *res;
+	void __iomem *base;
+	u32 num_viewport;
+	struct phy **phy;
+	u32 num_lanes;
+	char name[10];
+	u32 version;
+	int ret;
+	int irq;
+	int i;
+
+	data = of_device_get_match_data(dev);
+	if (!data)
+		return -EINVAL;
+
+	version = data->version;
+	host_ops = data->host_ops;
+	ep_ops = data->ep_ops;
+	mode = data->mode;
+
+	ks_pcie = devm_kzalloc(dev, sizeof(*ks_pcie), GFP_KERNEL);
+	if (!ks_pcie)
+		return -ENOMEM;
+
+	pci = devm_kzalloc(dev, sizeof(*pci), GFP_KERNEL);
+	if (!pci)
+		return -ENOMEM;
+
+	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "app");
+	ks_pcie->va_app_base = devm_ioremap_resource(dev, res);
+	if (IS_ERR(ks_pcie->va_app_base))
+		return PTR_ERR(ks_pcie->va_app_base);
+
+	ks_pcie->app = *res;
+
+	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dbics");
+	base = devm_pci_remap_cfg_resource(dev, res);
+	if (IS_ERR(base))
+		return PTR_ERR(base);
+
+	if (of_device_is_compatible(np, "ti,am654-pcie-rc"))
+		ks_pcie->is_am6 = true;
+
+	pci->dbi_base = base;
+	pci->dbi_base2 = base;
+	pci->dev = dev;
+	pci->ops = &ks_pcie_dw_pcie_ops;
+	pci->version = version;
+
+	irq = platform_get_irq(pdev, 0);
+	if (irq < 0)
+		return irq;
+
+	ret = request_irq(irq, ks_pcie_err_irq_handler, IRQF_SHARED,
+			  "ks-pcie-error-irq", ks_pcie);
+	if (ret < 0) {
+		dev_err(dev, "failed to request error IRQ %d\n",
+			irq);
+		return ret;
+	}
+
+	ret = of_property_read_u32(np, "num-lanes", &num_lanes);
+	if (ret)
+		num_lanes = 1;
+
+	phy = devm_kzalloc(dev, sizeof(*phy) * num_lanes, GFP_KERNEL);
+	if (!phy)
+		return -ENOMEM;
+
+	link = devm_kzalloc(dev, sizeof(*link) * num_lanes, GFP_KERNEL);
+	if (!link)
+		return -ENOMEM;
+
+	for (i = 0; i < num_lanes; i++) {
+		snprintf(name, sizeof(name), "pcie-phy%d", i);
+		phy[i] = devm_phy_optional_get(dev, name);
+		if (IS_ERR(phy[i])) {
+			ret = PTR_ERR(phy[i]);
+			goto err_link;
+		}
+
+		if (!phy[i])
+			continue;
+
+		link[i] = device_link_add(dev, &phy[i]->dev, DL_FLAG_STATELESS);
+		if (!link[i]) {
+			ret = -EINVAL;
+			goto err_link;
+		}
+	}
+
+	ks_pcie->np = np;
+	ks_pcie->pci = pci;
+	ks_pcie->link = link;
+	ks_pcie->num_lanes = num_lanes;
+	ks_pcie->phy = phy;
+
+	gpiod = devm_gpiod_get_optional(dev, "reset",
+					GPIOD_OUT_LOW);
+	if (IS_ERR(gpiod)) {
+		ret = PTR_ERR(gpiod);
+		if (ret != -EPROBE_DEFER)
+			dev_err(dev, "Failed to get reset GPIO\n");
+		goto err_link;
+	}
+
+	/* Obtain references to the PHYs */
+	for (i = 0; i < num_lanes; i++)
+		phy_pm_runtime_get_sync(ks_pcie->phy[i]);
+
+	ret = ks_pcie_enable_phy(ks_pcie);
+
+	/* Release references to the PHYs */
+	for (i = 0; i < num_lanes; i++)
+		phy_pm_runtime_put_sync(ks_pcie->phy[i]);
+
+	if (ret) {
+		dev_err(dev, "failed to enable phy\n");
+		goto err_link;
+	}
+
+	platform_set_drvdata(pdev, ks_pcie);
+	pm_runtime_enable(dev);
+	ret = pm_runtime_get_sync(dev);
+	if (ret < 0) {
+		dev_err(dev, "pm_runtime_get_sync failed\n");
+		goto err_get_sync;
+	}
+
+	if (dw_pcie_ver_is_ge(pci, 480A))
+		ret = ks_pcie_am654_set_mode(dev, mode);
+	else
+		ret = ks_pcie_set_mode(dev);
+	if (ret < 0)
+		goto err_get_sync;
+
+	switch (mode) {
+	case DW_PCIE_RC_TYPE:
+		if (!IS_ENABLED(CONFIG_PCI_KEYSTONE_HOST)) {
+			ret = -ENODEV;
+			goto err_get_sync;
+		}
+
+		ret = of_property_read_u32(np, "num-viewport", &num_viewport);
+		if (ret < 0) {
+			dev_err(dev, "unable to read *num-viewport* property\n");
+			goto err_get_sync;
+		}
+
+		/*
+		 * "Power Sequencing and Reset Signal Timings" table in
+		 * PCI EXPRESS CARD ELECTROMECHANICAL SPECIFICATION, REV. 2.0
+		 * indicates PERST# should be deasserted after minimum of 100us
+		 * once REFCLK is stable. The REFCLK to the connector in RC
+		 * mode is selected while enabling the PHY. So deassert PERST#
+		 * after 100 us.
+		 */
+		if (gpiod) {
+			usleep_range(100, 200);
+			gpiod_set_value_cansleep(gpiod, 1);
+		}
+
+		ks_pcie->num_viewport = num_viewport;
+		pci->pp.ops = host_ops;
+		ret = dw_pcie_host_init(&pci->pp);
+		if (ret < 0)
+			goto err_get_sync;
+		break;
+	case DW_PCIE_EP_TYPE:
+		if (!IS_ENABLED(CONFIG_PCI_KEYSTONE_EP)) {
+			ret = -ENODEV;
+			goto err_get_sync;
+		}
+
+		pci->ep.ops = ep_ops;
+		ret = dw_pcie_ep_init(&pci->ep);
+		if (ret < 0)
+			goto err_get_sync;
+		break;
+	default:
+		dev_err(dev, "INVALID device type %d\n", mode);
+	}
+
+	ks_pcie_enable_error_irq(ks_pcie);
+
+	return 0;
+
+err_get_sync:
+	pm_runtime_put(dev);
+	pm_runtime_disable(dev);
+	ks_pcie_disable_phy(ks_pcie);
+
+err_link:
+	while (--i >= 0 && link[i])
+		device_link_del(link[i]);
+
+	return ret;
+}
+
+static int ks_pcie_remove(struct platform_device *pdev)
+{
+	struct keystone_pcie *ks_pcie = platform_get_drvdata(pdev);
+	struct device_link **link = ks_pcie->link;
+	int num_lanes = ks_pcie->num_lanes;
+	struct device *dev = &pdev->dev;
+
+	pm_runtime_put(dev);
+	pm_runtime_disable(dev);
+	ks_pcie_disable_phy(ks_pcie);
+	while (num_lanes--)
+		device_link_del(link[num_lanes]);
+
+	return 0;
+}
+
+static struct platform_driver ks_pcie_driver = {
+	.probe  = ks_pcie_probe,
+	.remove = ks_pcie_remove,
+	.driver = {
+		.name	= "keystone-pcie",
+		.of_match_table = ks_pcie_of_match,
+	},
+};
+builtin_platform_driver(ks_pcie_driver);