drivers/pci/host/pci-keystone-dw.c - kernel/msm-4.19 - Gitiles

 /*
  * Designware application register space functions for Keystone PCI controller
  *
  * Copyright (C) 2013-2014 Texas Instruments., Ltd.
  *		http://www.ti.com
  *
  * Author: Murali Karicheri <m-karicheri2@ti.com>
  *
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
  * published by the Free Software Foundation.
  */

 #include <linux/irq.h>
 #include <linux/irqdomain.h>
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/of_pci.h>
 #include <linux/pci.h>
 #include <linux/platform_device.h>

 #include "pcie-designware.h"
 #include "pci-keystone.h"

 /* Application register defines */
 #define LTSSM_EN_VAL		        1
 #define LTSSM_STATE_MASK		0x1f
 #define LTSSM_STATE_L0			0x11
 #define DBI_CS2_EN_VAL			0x20
 #define OB_XLAT_EN_VAL		        2

 /* Application registers */
 #define CMD_STATUS			0x004
 #define CFG_SETUP			0x008
 #define OB_SIZE				0x030
 #define CFG_PCIM_WIN_SZ_IDX		3
 #define CFG_PCIM_WIN_CNT		32
 #define SPACE0_REMOTE_CFG_OFFSET	0x1000
 #define OB_OFFSET_INDEX(n)		(0x200 + (8 * n))
 #define OB_OFFSET_HI(n)			(0x204 + (8 * n))

 /* IRQ register defines */
 #define IRQ_EOI				0x050
 #define IRQ_STATUS			0x184
 #define IRQ_ENABLE_SET			0x188
 #define IRQ_ENABLE_CLR			0x18c

 #define MSI_IRQ				0x054
 #define MSI0_IRQ_STATUS			0x104
 #define MSI0_IRQ_ENABLE_SET		0x108
 #define MSI0_IRQ_ENABLE_CLR		0x10c
 #define IRQ_STATUS			0x184
 #define MSI_IRQ_OFFSET			4

 /* Config space registers */
 #define DEBUG0				0x728

 #define to_keystone_pcie(x)	container_of(x, struct keystone_pcie, pp)

 static inline struct pcie_port *sys_to_pcie(struct pci_sys_data *sys)
 {
 	return sys->private_data;
 }

 static inline void update_reg_offset_bit_pos(u32 offset, u32 *reg_offset,
 					     u32 *bit_pos)
 {
 	*reg_offset = offset % 8;
 	*bit_pos = offset >> 3;
 }

 phys_addr_t ks_dw_pcie_get_msi_addr(struct pcie_port *pp)
 {
 	struct keystone_pcie *ks_pcie = to_keystone_pcie(pp);

 	return ks_pcie->app.start + MSI_IRQ;
 }

 void ks_dw_pcie_handle_msi_irq(struct keystone_pcie *ks_pcie, int offset)
 {
 	struct pcie_port *pp = &ks_pcie->pp;
 	u32 pending, vector;
 	int src, virq;

 	pending = readl(ks_pcie->va_app_base + MSI0_IRQ_STATUS + (offset << 4));

 	/*
 	 * MSI0 status bit 0-3 shows vectors 0, 8, 16, 24, MSI1 status bit
 	 * shows 1, 9, 17, 25 and so forth
 	 */
 	for (src = 0; src < 4; src++) {
 		if (BIT(src) & pending) {
 			vector = offset + (src << 3);
 			virq = irq_linear_revmap(pp->irq_domain, vector);
 			dev_dbg(pp->dev, "irq: bit %d, vector %d, virq %d\n",
 				src, vector, virq);
 			generic_handle_irq(virq);
 		}
 	}
 }

 static void ks_dw_pcie_msi_irq_ack(struct irq_data *d)
 {
 	u32 offset, reg_offset, bit_pos;
 	struct keystone_pcie *ks_pcie;
 	struct msi_desc *msi;
 	struct pcie_port *pp;

 	msi = irq_data_get_msi_desc(d);
 	pp = sys_to_pcie(msi_desc_to_pci_sysdata(msi));
 	ks_pcie = to_keystone_pcie(pp);
 	offset = d->irq - irq_linear_revmap(pp->irq_domain, 0);
 	update_reg_offset_bit_pos(offset, &reg_offset, &bit_pos);

 	writel(BIT(bit_pos),
 	       ks_pcie->va_app_base + MSI0_IRQ_STATUS + (reg_offset << 4));
 	writel(reg_offset + MSI_IRQ_OFFSET, ks_pcie->va_app_base + IRQ_EOI);
 }

 void ks_dw_pcie_msi_set_irq(struct pcie_port *pp, int irq)
 {
 	u32 reg_offset, bit_pos;
 	struct keystone_pcie *ks_pcie = to_keystone_pcie(pp);

 	update_reg_offset_bit_pos(irq, &reg_offset, &bit_pos);
 	writel(BIT(bit_pos),
 	       ks_pcie->va_app_base + MSI0_IRQ_ENABLE_SET + (reg_offset << 4));
 }

 void ks_dw_pcie_msi_clear_irq(struct pcie_port *pp, int irq)
 {
 	u32 reg_offset, bit_pos;
 	struct keystone_pcie *ks_pcie = to_keystone_pcie(pp);

 	update_reg_offset_bit_pos(irq, &reg_offset, &bit_pos);
 	writel(BIT(bit_pos),
 	       ks_pcie->va_app_base + MSI0_IRQ_ENABLE_CLR + (reg_offset << 4));
 }

 static void ks_dw_pcie_msi_irq_mask(struct irq_data *d)
 {
 	struct keystone_pcie *ks_pcie;
 	struct msi_desc *msi;
 	struct pcie_port *pp;
 	u32 offset;

 	msi = irq_data_get_msi_desc(d);
 	pp = sys_to_pcie(msi_desc_to_pci_sysdata(msi));
 	ks_pcie = to_keystone_pcie(pp);
 	offset = d->irq - irq_linear_revmap(pp->irq_domain, 0);

 	/* Mask the end point if PVM implemented */
 	if (IS_ENABLED(CONFIG_PCI_MSI)) {
 		if (msi->msi_attrib.maskbit)
 			pci_msi_mask_irq(d);
 	}

 	ks_dw_pcie_msi_clear_irq(pp, offset);
 }

 static void ks_dw_pcie_msi_irq_unmask(struct irq_data *d)
 {
 	struct keystone_pcie *ks_pcie;
 	struct msi_desc *msi;
 	struct pcie_port *pp;
 	u32 offset;

 	msi = irq_data_get_msi_desc(d);
 	pp = sys_to_pcie(msi_desc_to_pci_sysdata(msi));
 	ks_pcie = to_keystone_pcie(pp);
 	offset = d->irq - irq_linear_revmap(pp->irq_domain, 0);

 	/* Mask the end point if PVM implemented */
 	if (IS_ENABLED(CONFIG_PCI_MSI)) {
 		if (msi->msi_attrib.maskbit)
 			pci_msi_unmask_irq(d);
 	}

 	ks_dw_pcie_msi_set_irq(pp, offset);
 }

 static struct irq_chip ks_dw_pcie_msi_irq_chip = {
 	.name = "Keystone-PCIe-MSI-IRQ",
 	.irq_ack = ks_dw_pcie_msi_irq_ack,
 	.irq_mask = ks_dw_pcie_msi_irq_mask,
 	.irq_unmask = ks_dw_pcie_msi_irq_unmask,
 };

 static int ks_dw_pcie_msi_map(struct irq_domain *domain, unsigned int irq,
 			      irq_hw_number_t hwirq)
 {
 	irq_set_chip_and_handler(irq, &ks_dw_pcie_msi_irq_chip,
 				 handle_level_irq);
 	irq_set_chip_data(irq, domain->host_data);

 	return 0;
 }

 static const struct irq_domain_ops ks_dw_pcie_msi_domain_ops = {
 	.map = ks_dw_pcie_msi_map,
 };

 int ks_dw_pcie_msi_host_init(struct pcie_port *pp, struct msi_controller *chip)
 {
 	struct keystone_pcie *ks_pcie = to_keystone_pcie(pp);
 	int i;

 	pp->irq_domain = irq_domain_add_linear(ks_pcie->msi_intc_np,
 					MAX_MSI_IRQS,
 					&ks_dw_pcie_msi_domain_ops,
 					chip);
 	if (!pp->irq_domain) {
 		dev_err(pp->dev, "irq domain init failed\n");
 		return -ENXIO;
 	}

 	for (i = 0; i < MAX_MSI_IRQS; i++)
 		irq_create_mapping(pp->irq_domain, i);

 	return 0;
 }

 void ks_dw_pcie_enable_legacy_irqs(struct keystone_pcie *ks_pcie)
 {
 	int i;

 	for (i = 0; i < MAX_LEGACY_IRQS; i++)
 		writel(0x1, ks_pcie->va_app_base + IRQ_ENABLE_SET + (i << 4));
 }

 void ks_dw_pcie_handle_legacy_irq(struct keystone_pcie *ks_pcie, int offset)
 {
 	struct pcie_port *pp = &ks_pcie->pp;
 	u32 pending;
 	int virq;

 	pending = readl(ks_pcie->va_app_base + IRQ_STATUS + (offset << 4));

 	if (BIT(0) & pending) {
 		virq = irq_linear_revmap(ks_pcie->legacy_irq_domain, offset);
 		dev_dbg(pp->dev, ": irq: irq_offset %d, virq %d\n", offset,
 			virq);
 		generic_handle_irq(virq);
 	}

 	/* EOI the INTx interrupt */
 	writel(offset, ks_pcie->va_app_base + IRQ_EOI);
 }

 static void ks_dw_pcie_ack_legacy_irq(struct irq_data *d)
 {
 }

 static void ks_dw_pcie_mask_legacy_irq(struct irq_data *d)
 {
 }

 static void ks_dw_pcie_unmask_legacy_irq(struct irq_data *d)
 {
 }

 static struct irq_chip ks_dw_pcie_legacy_irq_chip = {
 	.name = "Keystone-PCI-Legacy-IRQ",
 	.irq_ack = ks_dw_pcie_ack_legacy_irq,
 	.irq_mask = ks_dw_pcie_mask_legacy_irq,
 	.irq_unmask = ks_dw_pcie_unmask_legacy_irq,
 };

 static int ks_dw_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_dw_pcie_legacy_irq_chip,
 				 handle_level_irq);
 	irq_set_chip_data(irq, d->host_data);

 	return 0;
 }

 static const struct irq_domain_ops ks_dw_pcie_legacy_irq_domain_ops = {
 	.map = ks_dw_pcie_init_legacy_irq_map,
 	.xlate = irq_domain_xlate_onetwocell,
 };

 /**
  * ks_dw_pcie_set_dbi_mode() - Set DBI mode to access overlaid BAR mask
  * registers
  *
  * Since modification of dbi_cs2 involves different clock domain, read the
  * status back to ensure the transition is complete.
  */
 static void ks_dw_pcie_set_dbi_mode(void __iomem *reg_virt)
 {
 	u32 val;

 	writel(DBI_CS2_EN_VAL | readl(reg_virt + CMD_STATUS),
 	       reg_virt + CMD_STATUS);

 	do {
 		val = readl(reg_virt + CMD_STATUS);
 	} while (!(val & DBI_CS2_EN_VAL));
 }

 /**
  * ks_dw_pcie_clear_dbi_mode() - Disable DBI mode
  *
  * Since modification of dbi_cs2 involves different clock domain, read the
  * status back to ensure the transition is complete.
  */
 static void ks_dw_pcie_clear_dbi_mode(void __iomem *reg_virt)
 {
 	u32 val;

 	writel(~DBI_CS2_EN_VAL & readl(reg_virt + CMD_STATUS),
 		     reg_virt + CMD_STATUS);

 	do {
 		val = readl(reg_virt + CMD_STATUS);
 	} while (val & DBI_CS2_EN_VAL);
 }

 void ks_dw_pcie_setup_rc_app_regs(struct keystone_pcie *ks_pcie)
 {
 	struct pcie_port *pp = &ks_pcie->pp;
 	u32 start = pp->mem->start, end = pp->mem->end;
 	int i, tr_size;

 	/* Disable BARs for inbound access */
 	ks_dw_pcie_set_dbi_mode(ks_pcie->va_app_base);
 	writel(0, pp->dbi_base + PCI_BASE_ADDRESS_0);
 	writel(0, pp->dbi_base + PCI_BASE_ADDRESS_1);
 	ks_dw_pcie_clear_dbi_mode(ks_pcie->va_app_base);

 	/* Set outbound translation size per window division */
 	writel(CFG_PCIM_WIN_SZ_IDX & 0x7, ks_pcie->va_app_base + OB_SIZE);

 	tr_size = (1 << (CFG_PCIM_WIN_SZ_IDX & 0x7)) * SZ_1M;

 	/* Using Direct 1:1 mapping of RC <-> PCI memory space */
 	for (i = 0; (i < CFG_PCIM_WIN_CNT) && (start < end); i++) {
 		writel(start | 1, ks_pcie->va_app_base + OB_OFFSET_INDEX(i));
 		writel(0, ks_pcie->va_app_base + OB_OFFSET_HI(i));
 		start += tr_size;
 	}

 	/* Enable OB translation */
 	writel(OB_XLAT_EN_VAL | readl(ks_pcie->va_app_base + CMD_STATUS),
 	       ks_pcie->va_app_base + CMD_STATUS);
 }

 /**
  * ks_pcie_cfg_setup() - Set up configuration space address for a device
  *
  * @ks_pcie: ptr to keystone_pcie structure
  * @bus: Bus number the device is residing on
  * @devfn: device, function number info
  *
  * Forms and returns the address of configuration space mapped in PCIESS
  * address space 0.  Also configures CFG_SETUP for remote configuration space
  * access.
  *
  * The address space has two regions to access configuration - local and remote.
  * We access local region for bus 0 (as RC is attached on bus 0) and remote
  * region for others with TYPE 1 access when bus > 1.  As for device on bus = 1,
  * we will do TYPE 0 access as it will be on our secondary bus (logical).
  * CFG_SETUP is needed only for remote configuration access.
  */
 static void __iomem *ks_pcie_cfg_setup(struct keystone_pcie *ks_pcie, u8 bus,
 				       unsigned int devfn)
 {
 	u8 device = PCI_SLOT(devfn), function = PCI_FUNC(devfn);
 	struct pcie_port *pp = &ks_pcie->pp;
 	u32 regval;

 	if (bus == 0)
 		return pp->dbi_base;

 	regval = (bus << 16) | (device << 8) | function;

 	/*
 	 * Since Bus#1 will be a virtual bus, we need to have TYPE0
 	 * access only.
 	 * TYPE 1
 	 */
 	if (bus != 1)
 		regval |= BIT(24);

 	writel(regval, ks_pcie->va_app_base + CFG_SETUP);
 	return pp->va_cfg0_base;
 }

 int ks_dw_pcie_rd_other_conf(struct pcie_port *pp, struct pci_bus *bus,
 			     unsigned int devfn, int where, int size, u32 *val)
 {
 	struct keystone_pcie *ks_pcie = to_keystone_pcie(pp);
 	u8 bus_num = bus->number;
 	void __iomem *addr;

 	addr = ks_pcie_cfg_setup(ks_pcie, bus_num, devfn);

 	return dw_pcie_cfg_read(addr + where, size, val);
 }

 int ks_dw_pcie_wr_other_conf(struct pcie_port *pp, struct pci_bus *bus,
 			     unsigned int devfn, int where, int size, u32 val)
 {
 	struct keystone_pcie *ks_pcie = to_keystone_pcie(pp);
 	u8 bus_num = bus->number;
 	void __iomem *addr;

 	addr = ks_pcie_cfg_setup(ks_pcie, bus_num, devfn);

 	return dw_pcie_cfg_write(addr + where, size, val);
 }

 /**
  * ks_dw_pcie_v3_65_scan_bus() - keystone scan_bus post initialization
  *
  * This sets BAR0 to enable inbound access for MSI_IRQ register
  */
 void ks_dw_pcie_v3_65_scan_bus(struct pcie_port *pp)
 {
 	struct keystone_pcie *ks_pcie = to_keystone_pcie(pp);

 	/* Configure and set up BAR0 */
 	ks_dw_pcie_set_dbi_mode(ks_pcie->va_app_base);

 	/* Enable BAR0 */
 	writel(1, pp->dbi_base + PCI_BASE_ADDRESS_0);
 	writel(SZ_4K - 1, pp->dbi_base + PCI_BASE_ADDRESS_0);

 	ks_dw_pcie_clear_dbi_mode(ks_pcie->va_app_base);

 	 /*
 	  * For BAR0, just setting bus address for inbound writes (MSI) should
 	  * be sufficient.  Use physical address to avoid any conflicts.
 	  */
 	writel(ks_pcie->app.start, pp->dbi_base + PCI_BASE_ADDRESS_0);
 }

 /**
  * ks_dw_pcie_link_up() - Check if link up
  */
 int ks_dw_pcie_link_up(struct pcie_port *pp)
 {
 	u32 val = readl(pp->dbi_base + DEBUG0);

 	return (val & LTSSM_STATE_MASK) == LTSSM_STATE_L0;
 }

 void ks_dw_pcie_initiate_link_train(struct keystone_pcie *ks_pcie)
 {
 	u32 val;

 	/* Disable Link training */
 	val = readl(ks_pcie->va_app_base + CMD_STATUS);
 	val &= ~LTSSM_EN_VAL;
 	writel(LTSSM_EN_VAL | val,  ks_pcie->va_app_base + CMD_STATUS);

 	/* Initiate Link Training */
 	val = readl(ks_pcie->va_app_base + CMD_STATUS);
 	writel(LTSSM_EN_VAL | val,  ks_pcie->va_app_base + CMD_STATUS);
 }

 /**
  * ks_dw_pcie_host_init() - initialize host for v3_65 dw hardware
  *
  * Ioremap the register resources, initialize legacy irq domain
  * and call dw_pcie_v3_65_host_init() API to initialize the Keystone
  * PCI host controller.
  */
 int __init ks_dw_pcie_host_init(struct keystone_pcie *ks_pcie,
 				struct device_node *msi_intc_np)
 {
 	struct pcie_port *pp = &ks_pcie->pp;
 	struct platform_device *pdev = to_platform_device(pp->dev);
 	struct resource *res;

 	/* Index 0 is the config reg. space address */
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	pp->dbi_base = devm_ioremap_resource(pp->dev, res);
 	if (IS_ERR(pp->dbi_base))
 		return PTR_ERR(pp->dbi_base);

 	/*
 	 * We set these same and is used in pcie rd/wr_other_conf
 	 * functions
 	 */
 	pp->va_cfg0_base = pp->dbi_base + SPACE0_REMOTE_CFG_OFFSET;
 	pp->va_cfg1_base = pp->va_cfg0_base;

 	/* Index 1 is the application reg. space address */
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
 	ks_pcie->va_app_base = devm_ioremap_resource(pp->dev, res);
 	if (IS_ERR(ks_pcie->va_app_base))
 		return PTR_ERR(ks_pcie->va_app_base);

 	ks_pcie->app = *res;

 	/* Create legacy IRQ domain */
 	ks_pcie->legacy_irq_domain =
 			irq_domain_add_linear(ks_pcie->legacy_intc_np,
 					MAX_LEGACY_IRQS,
 					&ks_dw_pcie_legacy_irq_domain_ops,
 					NULL);
 	if (!ks_pcie->legacy_irq_domain) {
 		dev_err(pp->dev, "Failed to add irq domain for legacy irqs\n");
 		return -EINVAL;
 	}

 	return dw_pcie_host_init(pp);
 }
	/*
	* Designware application register space functions for Keystone PCI controller
	*
	* Copyright (C) 2013-2014 Texas Instruments., Ltd.
	* http://www.ti.com
	*
	* Author: Murali Karicheri <m-karicheri2@ti.com>
	*
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License version 2 as
	* published by the Free Software Foundation.
	*/

	#include <linux/irq.h>
	#include <linux/irqdomain.h>
	#include <linux/module.h>
	#include <linux/of.h>
	#include <linux/of_pci.h>
	#include <linux/pci.h>
	#include <linux/platform_device.h>

	#include "pcie-designware.h"
	#include "pci-keystone.h"

	/* Application register defines */
	#define LTSSM_EN_VAL 1
	#define LTSSM_STATE_MASK 0x1f
	#define LTSSM_STATE_L0 0x11
	#define DBI_CS2_EN_VAL 0x20
	#define OB_XLAT_EN_VAL 2

	/* Application registers */
	#define CMD_STATUS 0x004
	#define CFG_SETUP 0x008
	#define OB_SIZE 0x030
	#define CFG_PCIM_WIN_SZ_IDX 3
	#define CFG_PCIM_WIN_CNT 32
	#define SPACE0_REMOTE_CFG_OFFSET 0x1000
	#define OB_OFFSET_INDEX(n) (0x200 + (8 * n))
	#define OB_OFFSET_HI(n) (0x204 + (8 * n))

	/* IRQ register defines */
	#define IRQ_EOI 0x050
	#define IRQ_STATUS 0x184
	#define IRQ_ENABLE_SET 0x188
	#define IRQ_ENABLE_CLR 0x18c

	#define MSI_IRQ 0x054
	#define MSI0_IRQ_STATUS 0x104
	#define MSI0_IRQ_ENABLE_SET 0x108
	#define MSI0_IRQ_ENABLE_CLR 0x10c
	#define IRQ_STATUS 0x184
	#define MSI_IRQ_OFFSET 4

	/* Config space registers */
	#define DEBUG0 0x728

	#define to_keystone_pcie(x) container_of(x, struct keystone_pcie, pp)

	static inline struct pcie_port sys_to_pcie(struct pci_sys_data sys)
	{
	return sys->private_data;
	}

	static inline void update_reg_offset_bit_pos(u32 offset, u32 *reg_offset,
	u32 *bit_pos)
	{
	*reg_offset = offset % 8;
	*bit_pos = offset >> 3;
	}

	phys_addr_t ks_dw_pcie_get_msi_addr(struct pcie_port *pp)
	{
	struct keystone_pcie *ks_pcie = to_keystone_pcie(pp);

	return ks_pcie->app.start + MSI_IRQ;
	}

	void ks_dw_pcie_handle_msi_irq(struct keystone_pcie *ks_pcie, int offset)
	{
	struct pcie_port *pp = &ks_pcie->pp;
	u32 pending, vector;
	int src, virq;

	pending = readl(ks_pcie->va_app_base + MSI0_IRQ_STATUS + (offset << 4));

	/*
	* MSI0 status bit 0-3 shows vectors 0, 8, 16, 24, MSI1 status bit
	* shows 1, 9, 17, 25 and so forth
	*/
	for (src = 0; src < 4; src++) {
	if (BIT(src) & pending) {
	vector = offset + (src << 3);
	virq = irq_linear_revmap(pp->irq_domain, vector);
	dev_dbg(pp->dev, "irq: bit %d, vector %d, virq %d\n",
	src, vector, virq);
	generic_handle_irq(virq);
	}
	}
	}

	static void ks_dw_pcie_msi_irq_ack(struct irq_data *d)
	{
	u32 offset, reg_offset, bit_pos;
	struct keystone_pcie *ks_pcie;
	struct msi_desc *msi;
	struct pcie_port *pp;

	msi = irq_data_get_msi_desc(d);
	pp = sys_to_pcie(msi_desc_to_pci_sysdata(msi));
	ks_pcie = to_keystone_pcie(pp);
	offset = d->irq - irq_linear_revmap(pp->irq_domain, 0);
	update_reg_offset_bit_pos(offset, &reg_offset, &bit_pos);

	writel(BIT(bit_pos),
	ks_pcie->va_app_base + MSI0_IRQ_STATUS + (reg_offset << 4));
	writel(reg_offset + MSI_IRQ_OFFSET, ks_pcie->va_app_base + IRQ_EOI);
	}

	void ks_dw_pcie_msi_set_irq(struct pcie_port *pp, int irq)
	{
	u32 reg_offset, bit_pos;
	struct keystone_pcie *ks_pcie = to_keystone_pcie(pp);

	update_reg_offset_bit_pos(irq, &reg_offset, &bit_pos);
	writel(BIT(bit_pos),
	ks_pcie->va_app_base + MSI0_IRQ_ENABLE_SET + (reg_offset << 4));
	}

	void ks_dw_pcie_msi_clear_irq(struct pcie_port *pp, int irq)
	{
	u32 reg_offset, bit_pos;
	struct keystone_pcie *ks_pcie = to_keystone_pcie(pp);

	update_reg_offset_bit_pos(irq, &reg_offset, &bit_pos);
	writel(BIT(bit_pos),
	ks_pcie->va_app_base + MSI0_IRQ_ENABLE_CLR + (reg_offset << 4));
	}

	static void ks_dw_pcie_msi_irq_mask(struct irq_data *d)
	{
	struct keystone_pcie *ks_pcie;
	struct msi_desc *msi;
	struct pcie_port *pp;
	u32 offset;

	msi = irq_data_get_msi_desc(d);
	pp = sys_to_pcie(msi_desc_to_pci_sysdata(msi));
	ks_pcie = to_keystone_pcie(pp);
	offset = d->irq - irq_linear_revmap(pp->irq_domain, 0);

	/* Mask the end point if PVM implemented */
	if (IS_ENABLED(CONFIG_PCI_MSI)) {
	if (msi->msi_attrib.maskbit)
	pci_msi_mask_irq(d);
	}

	ks_dw_pcie_msi_clear_irq(pp, offset);
	}

	static void ks_dw_pcie_msi_irq_unmask(struct irq_data *d)
	{
	struct keystone_pcie *ks_pcie;
	struct msi_desc *msi;
	struct pcie_port *pp;
	u32 offset;

	msi = irq_data_get_msi_desc(d);
	pp = sys_to_pcie(msi_desc_to_pci_sysdata(msi));
	ks_pcie = to_keystone_pcie(pp);
	offset = d->irq - irq_linear_revmap(pp->irq_domain, 0);

	/* Mask the end point if PVM implemented */
	if (IS_ENABLED(CONFIG_PCI_MSI)) {
	if (msi->msi_attrib.maskbit)
	pci_msi_unmask_irq(d);
	}

	ks_dw_pcie_msi_set_irq(pp, offset);
	}

	static struct irq_chip ks_dw_pcie_msi_irq_chip = {
	.name = "Keystone-PCIe-MSI-IRQ",
	.irq_ack = ks_dw_pcie_msi_irq_ack,
	.irq_mask = ks_dw_pcie_msi_irq_mask,
	.irq_unmask = ks_dw_pcie_msi_irq_unmask,
	};

	static int ks_dw_pcie_msi_map(struct irq_domain *domain, unsigned int irq,
	irq_hw_number_t hwirq)
	{
	irq_set_chip_and_handler(irq, &ks_dw_pcie_msi_irq_chip,
	handle_level_irq);
	irq_set_chip_data(irq, domain->host_data);

	return 0;
	}

	static const struct irq_domain_ops ks_dw_pcie_msi_domain_ops = {
	.map = ks_dw_pcie_msi_map,
	};

	int ks_dw_pcie_msi_host_init(struct pcie_port pp, struct msi_controller chip)
	{
	struct keystone_pcie *ks_pcie = to_keystone_pcie(pp);
	int i;

	pp->irq_domain = irq_domain_add_linear(ks_pcie->msi_intc_np,
	MAX_MSI_IRQS,
	&ks_dw_pcie_msi_domain_ops,
	chip);
	if (!pp->irq_domain) {
	dev_err(pp->dev, "irq domain init failed\n");
	return -ENXIO;
	}

	for (i = 0; i < MAX_MSI_IRQS; i++)
	irq_create_mapping(pp->irq_domain, i);

	return 0;
	}

	void ks_dw_pcie_enable_legacy_irqs(struct keystone_pcie *ks_pcie)
	{
	int i;

	for (i = 0; i < MAX_LEGACY_IRQS; i++)
	writel(0x1, ks_pcie->va_app_base + IRQ_ENABLE_SET + (i << 4));
	}

	void ks_dw_pcie_handle_legacy_irq(struct keystone_pcie *ks_pcie, int offset)
	{
	struct pcie_port *pp = &ks_pcie->pp;
	u32 pending;
	int virq;

	pending = readl(ks_pcie->va_app_base + IRQ_STATUS + (offset << 4));

	if (BIT(0) & pending) {
	virq = irq_linear_revmap(ks_pcie->legacy_irq_domain, offset);
	dev_dbg(pp->dev, ": irq: irq_offset %d, virq %d\n", offset,
	virq);
	generic_handle_irq(virq);
	}

	/* EOI the INTx interrupt */
	writel(offset, ks_pcie->va_app_base + IRQ_EOI);
	}

	static void ks_dw_pcie_ack_legacy_irq(struct irq_data *d)
	{
	}

	static void ks_dw_pcie_mask_legacy_irq(struct irq_data *d)
	{
	}

	static void ks_dw_pcie_unmask_legacy_irq(struct irq_data *d)
	{
	}

	static struct irq_chip ks_dw_pcie_legacy_irq_chip = {
	.name = "Keystone-PCI-Legacy-IRQ",
	.irq_ack = ks_dw_pcie_ack_legacy_irq,
	.irq_mask = ks_dw_pcie_mask_legacy_irq,
	.irq_unmask = ks_dw_pcie_unmask_legacy_irq,
	};

	static int ks_dw_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_dw_pcie_legacy_irq_chip,
	handle_level_irq);
	irq_set_chip_data(irq, d->host_data);

	return 0;
	}

	static const struct irq_domain_ops ks_dw_pcie_legacy_irq_domain_ops = {
	.map = ks_dw_pcie_init_legacy_irq_map,
	.xlate = irq_domain_xlate_onetwocell,
	};

	/**
	* ks_dw_pcie_set_dbi_mode() - Set DBI mode to access overlaid BAR mask
	* registers
	*
	* Since modification of dbi_cs2 involves different clock domain, read the
	* status back to ensure the transition is complete.
	*/
	static void ks_dw_pcie_set_dbi_mode(void __iomem *reg_virt)
	{
	u32 val;

	writel(DBI_CS2_EN_VAL \| readl(reg_virt + CMD_STATUS),
	reg_virt + CMD_STATUS);

	do {
	val = readl(reg_virt + CMD_STATUS);
	} while (!(val & DBI_CS2_EN_VAL));
	}

	/**
	* ks_dw_pcie_clear_dbi_mode() - Disable DBI mode
	*
	* Since modification of dbi_cs2 involves different clock domain, read the
	* status back to ensure the transition is complete.
	*/
	static void ks_dw_pcie_clear_dbi_mode(void __iomem *reg_virt)
	{
	u32 val;

	writel(~DBI_CS2_EN_VAL & readl(reg_virt + CMD_STATUS),
	reg_virt + CMD_STATUS);

	do {
	val = readl(reg_virt + CMD_STATUS);
	} while (val & DBI_CS2_EN_VAL);
	}

	void ks_dw_pcie_setup_rc_app_regs(struct keystone_pcie *ks_pcie)
	{
	struct pcie_port *pp = &ks_pcie->pp;
	u32 start = pp->mem->start, end = pp->mem->end;
	int i, tr_size;

	/* Disable BARs for inbound access */
	ks_dw_pcie_set_dbi_mode(ks_pcie->va_app_base);
	writel(0, pp->dbi_base + PCI_BASE_ADDRESS_0);
	writel(0, pp->dbi_base + PCI_BASE_ADDRESS_1);
	ks_dw_pcie_clear_dbi_mode(ks_pcie->va_app_base);

	/* Set outbound translation size per window division */
	writel(CFG_PCIM_WIN_SZ_IDX & 0x7, ks_pcie->va_app_base + OB_SIZE);

	tr_size = (1 << (CFG_PCIM_WIN_SZ_IDX & 0x7)) * SZ_1M;

	/* Using Direct 1:1 mapping of RC <-> PCI memory space */
	for (i = 0; (i < CFG_PCIM_WIN_CNT) && (start < end); i++) {
	writel(start \| 1, ks_pcie->va_app_base + OB_OFFSET_INDEX(i));
	writel(0, ks_pcie->va_app_base + OB_OFFSET_HI(i));
	start += tr_size;
	}

	/* Enable OB translation */
	writel(OB_XLAT_EN_VAL \| readl(ks_pcie->va_app_base + CMD_STATUS),
	ks_pcie->va_app_base + CMD_STATUS);
	}

	/**
	* ks_pcie_cfg_setup() - Set up configuration space address for a device
	*
	* @ks_pcie: ptr to keystone_pcie structure
	* @bus: Bus number the device is residing on
	* @devfn: device, function number info
	*
	* Forms and returns the address of configuration space mapped in PCIESS
	* address space 0. Also configures CFG_SETUP for remote configuration space
	* access.
	*
	* The address space has two regions to access configuration - local and remote.
	* We access local region for bus 0 (as RC is attached on bus 0) and remote
	* region for others with TYPE 1 access when bus > 1. As for device on bus = 1,
	* we will do TYPE 0 access as it will be on our secondary bus (logical).
	* CFG_SETUP is needed only for remote configuration access.
	*/
	static void __iomem ks_pcie_cfg_setup(struct keystone_pcie ks_pcie, u8 bus,
	unsigned int devfn)
	{
	u8 device = PCI_SLOT(devfn), function = PCI_FUNC(devfn);
	struct pcie_port *pp = &ks_pcie->pp;
	u32 regval;

	if (bus == 0)
	return pp->dbi_base;

	regval = (bus << 16) \| (device << 8) \| function;

	/*
	* Since Bus#1 will be a virtual bus, we need to have TYPE0
	* access only.
	* TYPE 1
	*/
	if (bus != 1)
	regval \|= BIT(24);

	writel(regval, ks_pcie->va_app_base + CFG_SETUP);
	return pp->va_cfg0_base;
	}

	int ks_dw_pcie_rd_other_conf(struct pcie_port pp, struct pci_bus bus,
	unsigned int devfn, int where, int size, u32 *val)
	{
	struct keystone_pcie *ks_pcie = to_keystone_pcie(pp);
	u8 bus_num = bus->number;
	void __iomem *addr;

	addr = ks_pcie_cfg_setup(ks_pcie, bus_num, devfn);

	return dw_pcie_cfg_read(addr + where, size, val);
	}

	int ks_dw_pcie_wr_other_conf(struct pcie_port pp, struct pci_bus bus,
	unsigned int devfn, int where, int size, u32 val)
	{
	struct keystone_pcie *ks_pcie = to_keystone_pcie(pp);
	u8 bus_num = bus->number;
	void __iomem *addr;

	addr = ks_pcie_cfg_setup(ks_pcie, bus_num, devfn);

	return dw_pcie_cfg_write(addr + where, size, val);
	}

	/**
	* ks_dw_pcie_v3_65_scan_bus() - keystone scan_bus post initialization
	*
	* This sets BAR0 to enable inbound access for MSI_IRQ register
	*/
	void ks_dw_pcie_v3_65_scan_bus(struct pcie_port *pp)
	{
	struct keystone_pcie *ks_pcie = to_keystone_pcie(pp);

	/* Configure and set up BAR0 */
	ks_dw_pcie_set_dbi_mode(ks_pcie->va_app_base);

	/* Enable BAR0 */
	writel(1, pp->dbi_base + PCI_BASE_ADDRESS_0);
	writel(SZ_4K - 1, pp->dbi_base + PCI_BASE_ADDRESS_0);

	ks_dw_pcie_clear_dbi_mode(ks_pcie->va_app_base);

	/*
	* For BAR0, just setting bus address for inbound writes (MSI) should
	* be sufficient. Use physical address to avoid any conflicts.
	*/
	writel(ks_pcie->app.start, pp->dbi_base + PCI_BASE_ADDRESS_0);
	}

	/**
	* ks_dw_pcie_link_up() - Check if link up
	*/
	int ks_dw_pcie_link_up(struct pcie_port *pp)
	{
	u32 val = readl(pp->dbi_base + DEBUG0);

	return (val & LTSSM_STATE_MASK) == LTSSM_STATE_L0;
	}

	void ks_dw_pcie_initiate_link_train(struct keystone_pcie *ks_pcie)
	{
	u32 val;

	/* Disable Link training */
	val = readl(ks_pcie->va_app_base + CMD_STATUS);
	val &= ~LTSSM_EN_VAL;
	writel(LTSSM_EN_VAL \| val, ks_pcie->va_app_base + CMD_STATUS);

	/* Initiate Link Training */
	val = readl(ks_pcie->va_app_base + CMD_STATUS);
	writel(LTSSM_EN_VAL \| val, ks_pcie->va_app_base + CMD_STATUS);
	}

	/**
	* ks_dw_pcie_host_init() - initialize host for v3_65 dw hardware
	*
	* Ioremap the register resources, initialize legacy irq domain
	* and call dw_pcie_v3_65_host_init() API to initialize the Keystone
	* PCI host controller.
	*/
	int __init ks_dw_pcie_host_init(struct keystone_pcie *ks_pcie,
	struct device_node *msi_intc_np)
	{
	struct pcie_port *pp = &ks_pcie->pp;
	struct platform_device *pdev = to_platform_device(pp->dev);
	struct resource *res;

	/* Index 0 is the config reg. space address */
	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	pp->dbi_base = devm_ioremap_resource(pp->dev, res);
	if (IS_ERR(pp->dbi_base))
	return PTR_ERR(pp->dbi_base);

	/*
	* We set these same and is used in pcie rd/wr_other_conf
	* functions
	*/
	pp->va_cfg0_base = pp->dbi_base + SPACE0_REMOTE_CFG_OFFSET;
	pp->va_cfg1_base = pp->va_cfg0_base;

	/* Index 1 is the application reg. space address */
	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
	ks_pcie->va_app_base = devm_ioremap_resource(pp->dev, res);
	if (IS_ERR(ks_pcie->va_app_base))
	return PTR_ERR(ks_pcie->va_app_base);

	ks_pcie->app = *res;

	/* Create legacy IRQ domain */
	ks_pcie->legacy_irq_domain =
	irq_domain_add_linear(ks_pcie->legacy_intc_np,
	MAX_LEGACY_IRQS,
	&ks_dw_pcie_legacy_irq_domain_ops,
	NULL);
	if (!ks_pcie->legacy_irq_domain) {
	dev_err(pp->dev, "Failed to add irq domain for legacy irqs\n");
	return -EINVAL;
	}

	return dw_pcie_host_init(pp);
	}