[mirror_ubuntu-focal-kernel.git] / drivers / pci / host / pci-keystone-dw.c

/*
 * 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;
}

u32 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;
	unsigned int irq = d->irq;
	struct msi_desc *msi;
	struct pcie_port *pp;

	msi = irq_get_msi_desc(irq);
	pp = sys_to_pcie(msi->dev->bus->sysdata);
	ks_pcie = to_keystone_pcie(pp);
	offset = 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;
	unsigned int irq = d->irq;
	struct msi_desc *msi;
	struct pcie_port *pp;
	u32 offset;

	msi = irq_get_msi_desc(irq);
	pp = sys_to_pcie(msi->dev->bus->sysdata);
	ks_pcie = to_keystone_pcie(pp);
	offset = 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;
	unsigned int irq = d->irq;
	struct msi_desc *msi;
	struct pcie_port *pp;
	u32 offset;

	msi = irq_get_msi_desc(irq);
	pp = sys_to_pcie(msi->dev->bus->sysdata);
	ks_pcie = to_keystone_pcie(pp);
	offset = 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);
	set_irq_flags(irq, IRQF_VALID);

	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);
	set_irq_flags(irq, IRQF_VALID);

	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 & ~0x3), 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 & ~0x3), 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->app = *res;
	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);

	/* 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);
}
Commit	Line	Data
0c4ffcfe MK	1	/*
	2	* Designware application register space functions for Keystone PCI controller
	3	*
	4	* Copyright (C) 2013-2014 Texas Instruments., Ltd.
	5	* http://www.ti.com
	6	*
	7	* Author: Murali Karicheri <m-karicheri2@ti.com>
	8	*
	9	*
	10	* This program is free software; you can redistribute it and/or modify
	11	* it under the terms of the GNU General Public License version 2 as
	12	* published by the Free Software Foundation.
	13	*/
	14
	15	#include <linux/irq.h>
	16	#include <linux/irqdomain.h>
	17	#include <linux/module.h>
	18	#include <linux/of.h>
	19	#include <linux/of_pci.h>
	20	#include <linux/pci.h>
	21	#include <linux/platform_device.h>
	22
	23	#include "pcie-designware.h"
	24	#include "pci-keystone.h"
	25
	26	/* Application register defines */
	27	#define LTSSM_EN_VAL 1
	28	#define LTSSM_STATE_MASK 0x1f
	29	#define LTSSM_STATE_L0 0x11
	30	#define DBI_CS2_EN_VAL 0x20
	31	#define OB_XLAT_EN_VAL 2
	32
	33	/* Application registers */
	34	#define CMD_STATUS 0x004
	35	#define CFG_SETUP 0x008
	36	#define OB_SIZE 0x030
	37	#define CFG_PCIM_WIN_SZ_IDX 3
	38	#define CFG_PCIM_WIN_CNT 32
	39	#define SPACE0_REMOTE_CFG_OFFSET 0x1000
	40	#define OB_OFFSET_INDEX(n) (0x200 + (8 * n))
	41	#define OB_OFFSET_HI(n) (0x204 + (8 * n))
	42
	43	/* IRQ register defines */
	44	#define IRQ_EOI 0x050
	45	#define IRQ_STATUS 0x184
	46	#define IRQ_ENABLE_SET 0x188
	47	#define IRQ_ENABLE_CLR 0x18c
	48
	49	#define MSI_IRQ 0x054
	50	#define MSI0_IRQ_STATUS 0x104
	51	#define MSI0_IRQ_ENABLE_SET 0x108
	52	#define MSI0_IRQ_ENABLE_CLR 0x10c
	53	#define IRQ_STATUS 0x184
	54	#define MSI_IRQ_OFFSET 4
	55
	56	/* Config space registers */
	57	#define DEBUG0 0x728
	58
	59	#define to_keystone_pcie(x) container_of(x, struct keystone_pcie, pp)
	60
	61	static inline struct pcie_port sys_to_pcie(struct pci_sys_data sys)
	62	{
	63	return sys->private_data;
	64	}
65
66	static inline void update_reg_offset_bit_pos(u32 offset, u32 *reg_offset,
67	u32 *bit_pos)
68	{
69	*reg_offset = offset % 8;
70	*bit_pos = offset >> 3;
71	}
72
1104528b	73	u32 ks_dw_pcie_get_msi_addr(struct pcie_port *pp)
0c4ffcfe MK	74	{
	75	struct keystone_pcie *ks_pcie = to_keystone_pcie(pp);
	76
	77	return ks_pcie->app.start + MSI_IRQ;
	78	}
	79
	80	void ks_dw_pcie_handle_msi_irq(struct keystone_pcie *ks_pcie, int offset)
	81	{
	82	struct pcie_port *pp = &ks_pcie->pp;
	83	u32 pending, vector;
	84	int src, virq;
	85
	86	pending = readl(ks_pcie->va_app_base + MSI0_IRQ_STATUS + (offset << 4));
	87
	88	/*
	89	* MSI0 status bit 0-3 shows vectors 0, 8, 16, 24, MSI1 status bit
	90	* shows 1, 9, 17, 25 and so forth
	91	*/
	92	for (src = 0; src < 4; src++) {
	93	if (BIT(src) & pending) {
	94	vector = offset + (src << 3);
	95	virq = irq_linear_revmap(pp->irq_domain, vector);
	96	dev_dbg(pp->dev, "irq: bit %d, vector %d, virq %d\n",
	97	src, vector, virq);
	98	generic_handle_irq(virq);
	99	}
	100	}
	101	}
	102
	103	static void ks_dw_pcie_msi_irq_ack(struct irq_data *d)
	104	{
	105	u32 offset, reg_offset, bit_pos;
	106	struct keystone_pcie *ks_pcie;
	107	unsigned int irq = d->irq;
	108	struct msi_desc *msi;
	109	struct pcie_port *pp;
	110
	111	msi = irq_get_msi_desc(irq);
	112	pp = sys_to_pcie(msi->dev->bus->sysdata);
	113	ks_pcie = to_keystone_pcie(pp);
	114	offset = irq - irq_linear_revmap(pp->irq_domain, 0);
	115	update_reg_offset_bit_pos(offset, &reg_offset, &bit_pos);
	116
	117	writel(BIT(bit_pos),
	118	ks_pcie->va_app_base + MSI0_IRQ_STATUS + (reg_offset << 4));
	119	writel(reg_offset + MSI_IRQ_OFFSET, ks_pcie->va_app_base + IRQ_EOI);
	120	}
	121
	122	void ks_dw_pcie_msi_set_irq(struct pcie_port *pp, int irq)
	123	{
	124	u32 reg_offset, bit_pos;
	125	struct keystone_pcie *ks_pcie = to_keystone_pcie(pp);
	126
	127	update_reg_offset_bit_pos(irq, &reg_offset, &bit_pos);
	128	writel(BIT(bit_pos),
	129	ks_pcie->va_app_base + MSI0_IRQ_ENABLE_SET + (reg_offset << 4));
	130	}
	131
	132	void ks_dw_pcie_msi_clear_irq(struct pcie_port *pp, int irq)
	133	{
	134	u32 reg_offset, bit_pos;
	135	struct keystone_pcie *ks_pcie = to_keystone_pcie(pp);
	136
	137	update_reg_offset_bit_pos(irq, &reg_offset, &bit_pos);
138	writel(BIT(bit_pos),
139	ks_pcie->va_app_base + MSI0_IRQ_ENABLE_CLR + (reg_offset << 4));
140	}
141
142	static void ks_dw_pcie_msi_irq_mask(struct irq_data *d)
143	{
144	struct keystone_pcie *ks_pcie;
145	unsigned int irq = d->irq;
146	struct msi_desc *msi;
147	struct pcie_port *pp;
148	u32 offset;
149
150	msi = irq_get_msi_desc(irq);
151	pp = sys_to_pcie(msi->dev->bus->sysdata);
152	ks_pcie = to_keystone_pcie(pp);
153	offset = irq - irq_linear_revmap(pp->irq_domain, 0);
154
155	/* Mask the end point if PVM implemented */
156	if (IS_ENABLED(CONFIG_PCI_MSI)) {
157	if (msi->msi_attrib.maskbit)
280510f1	158	pci_msi_mask_irq(d);
0c4ffcfe MK	159	}
	160
	161	ks_dw_pcie_msi_clear_irq(pp, offset);
	162	}
	163
	164	static void ks_dw_pcie_msi_irq_unmask(struct irq_data *d)
	165	{
	166	struct keystone_pcie *ks_pcie;
	167	unsigned int irq = d->irq;
	168	struct msi_desc *msi;
	169	struct pcie_port *pp;
	170	u32 offset;
	171
	172	msi = irq_get_msi_desc(irq);
	173	pp = sys_to_pcie(msi->dev->bus->sysdata);
	174	ks_pcie = to_keystone_pcie(pp);
	175	offset = irq - irq_linear_revmap(pp->irq_domain, 0);
	176
	177	/* Mask the end point if PVM implemented */
	178	if (IS_ENABLED(CONFIG_PCI_MSI)) {
	179	if (msi->msi_attrib.maskbit)
280510f1	180	pci_msi_unmask_irq(d);
0c4ffcfe MK	181	}
	182
	183	ks_dw_pcie_msi_set_irq(pp, offset);
	184	}
	185
	186	static struct irq_chip ks_dw_pcie_msi_irq_chip = {
	187	.name = "Keystone-PCIe-MSI-IRQ",
	188	.irq_ack = ks_dw_pcie_msi_irq_ack,
	189	.irq_mask = ks_dw_pcie_msi_irq_mask,
	190	.irq_unmask = ks_dw_pcie_msi_irq_unmask,
	191	};
	192
	193	static int ks_dw_pcie_msi_map(struct irq_domain *domain, unsigned int irq,
	194	irq_hw_number_t hwirq)
	195	{
	196	irq_set_chip_and_handler(irq, &ks_dw_pcie_msi_irq_chip,
	197	handle_level_irq);
	198	irq_set_chip_data(irq, domain->host_data);
	199	set_irq_flags(irq, IRQF_VALID);
	200
	201	return 0;
	202	}
	203
5ba8368b	204	static const struct irq_domain_ops ks_dw_pcie_msi_domain_ops = {
0c4ffcfe MK	205	.map = ks_dw_pcie_msi_map,
	206	};
	207
c2791b80	208	int ks_dw_pcie_msi_host_init(struct pcie_port pp, struct msi_controller chip)
0c4ffcfe MK	209	{
	210	struct keystone_pcie *ks_pcie = to_keystone_pcie(pp);
	211	int i;
	212
	213	pp->irq_domain = irq_domain_add_linear(ks_pcie->msi_intc_np,
	214	MAX_MSI_IRQS,
	215	&ks_dw_pcie_msi_domain_ops,
	216	chip);
	217	if (!pp->irq_domain) {
	218	dev_err(pp->dev, "irq domain init failed\n");
	219	return -ENXIO;
	220	}
	221
	222	for (i = 0; i < MAX_MSI_IRQS; i++)
	223	irq_create_mapping(pp->irq_domain, i);
	224
	225	return 0;
	226	}
	227
	228	void ks_dw_pcie_enable_legacy_irqs(struct keystone_pcie *ks_pcie)
	229	{
	230	int i;
	231
	232	for (i = 0; i < MAX_LEGACY_IRQS; i++)
	233	writel(0x1, ks_pcie->va_app_base + IRQ_ENABLE_SET + (i << 4));
	234	}
	235
	236	void ks_dw_pcie_handle_legacy_irq(struct keystone_pcie *ks_pcie, int offset)
	237	{
	238	struct pcie_port *pp = &ks_pcie->pp;
	239	u32 pending;
	240	int virq;
	241
	242	pending = readl(ks_pcie->va_app_base + IRQ_STATUS + (offset << 4));
	243
	244	if (BIT(0) & pending) {
	245	virq = irq_linear_revmap(ks_pcie->legacy_irq_domain, offset);
	246	dev_dbg(pp->dev, ": irq: irq_offset %d, virq %d\n", offset,
	247	virq);
	248	generic_handle_irq(virq);
	249	}
	250
	251	/* EOI the INTx interrupt */
	252	writel(offset, ks_pcie->va_app_base + IRQ_EOI);
	253	}
	254
	255	static void ks_dw_pcie_ack_legacy_irq(struct irq_data *d)
	256	{
	257	}
	258
	259	static void ks_dw_pcie_mask_legacy_irq(struct irq_data *d)
	260	{
	261	}
	262
	263	static void ks_dw_pcie_unmask_legacy_irq(struct irq_data *d)
	264	{
	265	}
	266
	267	static struct irq_chip ks_dw_pcie_legacy_irq_chip = {
	268	.name = "Keystone-PCI-Legacy-IRQ",
	269	.irq_ack = ks_dw_pcie_ack_legacy_irq,
	270	.irq_mask = ks_dw_pcie_mask_legacy_irq,
	271	.irq_unmask = ks_dw_pcie_unmask_legacy_irq,
	272	};
273
274	static int ks_dw_pcie_init_legacy_irq_map(struct irq_domain *d,
275	unsigned int irq, irq_hw_number_t hw_irq)
276	{
277	irq_set_chip_and_handler(irq, &ks_dw_pcie_legacy_irq_chip,
278	handle_level_irq);
279	irq_set_chip_data(irq, d->host_data);
280	set_irq_flags(irq, IRQF_VALID);
281
282	return 0;
283	}
284
285	static const struct irq_domain_ops ks_dw_pcie_legacy_irq_domain_ops = {
286	.map = ks_dw_pcie_init_legacy_irq_map,
287	.xlate = irq_domain_xlate_onetwocell,
288	};
289
290	/**
291	* ks_dw_pcie_set_dbi_mode() - Set DBI mode to access overlaid BAR mask
292	* registers
293	*
294	* Since modification of dbi_cs2 involves different clock domain, read the
295	* status back to ensure the transition is complete.
296	*/
297	static void ks_dw_pcie_set_dbi_mode(void __iomem *reg_virt)
298	{
299	u32 val;
300
301	writel(DBI_CS2_EN_VAL \| readl(reg_virt + CMD_STATUS),
302	reg_virt + CMD_STATUS);
303
304	do {
305	val = readl(reg_virt + CMD_STATUS);
306	} while (!(val & DBI_CS2_EN_VAL));
307	}
308
309	/**
310	* ks_dw_pcie_clear_dbi_mode() - Disable DBI mode
311	*
312	* Since modification of dbi_cs2 involves different clock domain, read the
313	* status back to ensure the transition is complete.
314	*/
315	static void ks_dw_pcie_clear_dbi_mode(void __iomem *reg_virt)
316	{
317	u32 val;
318
319	writel(~DBI_CS2_EN_VAL & readl(reg_virt + CMD_STATUS),
320	reg_virt + CMD_STATUS);
321
322	do {
323	val = readl(reg_virt + CMD_STATUS);
324	} while (val & DBI_CS2_EN_VAL);
325	}
326
327	void ks_dw_pcie_setup_rc_app_regs(struct keystone_pcie *ks_pcie)
328	{
329	struct pcie_port *pp = &ks_pcie->pp;
330	u32 start = pp->mem.start, end = pp->mem.end;
331	int i, tr_size;
332
333	/* Disable BARs for inbound access */
334	ks_dw_pcie_set_dbi_mode(ks_pcie->va_app_base);
335	writel(0, pp->dbi_base + PCI_BASE_ADDRESS_0);
336	writel(0, pp->dbi_base + PCI_BASE_ADDRESS_1);
337	ks_dw_pcie_clear_dbi_mode(ks_pcie->va_app_base);
338
339	/* Set outbound translation size per window division */
340	writel(CFG_PCIM_WIN_SZ_IDX & 0x7, ks_pcie->va_app_base + OB_SIZE);
341
342	tr_size = (1 << (CFG_PCIM_WIN_SZ_IDX & 0x7)) * SZ_1M;
343
344	/* Using Direct 1:1 mapping of RC <-> PCI memory space */
345	for (i = 0; (i < CFG_PCIM_WIN_CNT) && (start < end); i++) {
346	writel(start \| 1, ks_pcie->va_app_base + OB_OFFSET_INDEX(i));
347	writel(0, ks_pcie->va_app_base + OB_OFFSET_HI(i));
348	start += tr_size;
349	}
350
351	/* Enable OB translation */
352	writel(OB_XLAT_EN_VAL \| readl(ks_pcie->va_app_base + CMD_STATUS),
353	ks_pcie->va_app_base + CMD_STATUS);
354	}
355
356	/**
357	* ks_pcie_cfg_setup() - Set up configuration space address for a device
358	*
359	* @ks_pcie: ptr to keystone_pcie structure
360	* @bus: Bus number the device is residing on
361	* @devfn: device, function number info
362	*
363	* Forms and returns the address of configuration space mapped in PCIESS
364	* address space 0. Also configures CFG_SETUP for remote configuration space
365	* access.
366	*
367	* The address space has two regions to access configuration - local and remote.
368	* We access local region for bus 0 (as RC is attached on bus 0) and remote
369	* region for others with TYPE 1 access when bus > 1. As for device on bus = 1,
370	* we will do TYPE 0 access as it will be on our secondary bus (logical).
371	* CFG_SETUP is needed only for remote configuration access.
372	*/
373	static void __iomem ks_pcie_cfg_setup(struct keystone_pcie ks_pcie, u8 bus,
374	unsigned int devfn)
375	{
376	u8 device = PCI_SLOT(devfn), function = PCI_FUNC(devfn);
377	struct pcie_port *pp = &ks_pcie->pp;
378	u32 regval;
379
380	if (bus == 0)
381	return pp->dbi_base;
382
383	regval = (bus << 16) \| (device << 8) \| function;
384
385	/*
386	* Since Bus#1 will be a virtual bus, we need to have TYPE0
387	* access only.
388	* TYPE 1
389	*/
390	if (bus != 1)
391	regval \|= BIT(24);
392
393	writel(regval, ks_pcie->va_app_base + CFG_SETUP);
394	return pp->va_cfg0_base;
395	}
396
397	int ks_dw_pcie_rd_other_conf(struct pcie_port pp, struct pci_bus bus,
398	unsigned int devfn, int where, int size, u32 *val)
399	{
400	struct keystone_pcie *ks_pcie = to_keystone_pcie(pp);
401	u8 bus_num = bus->number;
402	void __iomem *addr;
403
404	addr = ks_pcie_cfg_setup(ks_pcie, bus_num, devfn);
405
406	return dw_pcie_cfg_read(addr + (where & ~0x3), where, size, val);
407	}
408
409	int ks_dw_pcie_wr_other_conf(struct pcie_port pp, struct pci_bus bus,
410	unsigned int devfn, int where, int size, u32 val)
411	{
412	struct keystone_pcie *ks_pcie = to_keystone_pcie(pp);
413	u8 bus_num = bus->number;
414	void __iomem *addr;
415
416	addr = ks_pcie_cfg_setup(ks_pcie, bus_num, devfn);
417
418	return dw_pcie_cfg_write(addr + (where & ~0x3), where, size, val);
419	}
420
421	/**
422	* ks_dw_pcie_v3_65_scan_bus() - keystone scan_bus post initialization
423	*
424	* This sets BAR0 to enable inbound access for MSI_IRQ register
425	*/
426	void ks_dw_pcie_v3_65_scan_bus(struct pcie_port *pp)
427	{
428	struct keystone_pcie *ks_pcie = to_keystone_pcie(pp);
429
430	/* Configure and set up BAR0 */
431	ks_dw_pcie_set_dbi_mode(ks_pcie->va_app_base);
432
433	/* Enable BAR0 */
434	writel(1, pp->dbi_base + PCI_BASE_ADDRESS_0);
435	writel(SZ_4K - 1, pp->dbi_base + PCI_BASE_ADDRESS_0);
436
437	ks_dw_pcie_clear_dbi_mode(ks_pcie->va_app_base);
438
439	/*
440	* For BAR0, just setting bus address for inbound writes (MSI) should
441	* be sufficient. Use physical address to avoid any conflicts.
442	*/
443	writel(ks_pcie->app.start, pp->dbi_base + PCI_BASE_ADDRESS_0);
444	}
445
446	/**
447	* ks_dw_pcie_link_up() - Check if link up
448	*/
449	int ks_dw_pcie_link_up(struct pcie_port *pp)
450	{
451	u32 val = readl(pp->dbi_base + DEBUG0);
452
453	return (val & LTSSM_STATE_MASK) == LTSSM_STATE_L0;
454	}
455
456	void ks_dw_pcie_initiate_link_train(struct keystone_pcie *ks_pcie)
457	{
458	u32 val;
459
460	/* Disable Link training */
461	val = readl(ks_pcie->va_app_base + CMD_STATUS);
462	val &= ~LTSSM_EN_VAL;
463	writel(LTSSM_EN_VAL \| val, ks_pcie->va_app_base + CMD_STATUS);
464
465	/* Initiate Link Training */
466	val = readl(ks_pcie->va_app_base + CMD_STATUS);
467	writel(LTSSM_EN_VAL \| val, ks_pcie->va_app_base + CMD_STATUS);
468	}
469
470	/**
471	* ks_dw_pcie_host_init() - initialize host for v3_65 dw hardware
472	*
473	* Ioremap the register resources, initialize legacy irq domain
474	* and call dw_pcie_v3_65_host_init() API to initialize the Keystone
475	* PCI host controller.
476	*/
477	int __init ks_dw_pcie_host_init(struct keystone_pcie *ks_pcie,
478	struct device_node *msi_intc_np)
479	{
480	struct pcie_port *pp = &ks_pcie->pp;
481	struct platform_device *pdev = to_platform_device(pp->dev);
482	struct resource *res;
483
484	/* Index 0 is the config reg. space address */
485	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
486	pp->dbi_base = devm_ioremap_resource(pp->dev, res);
487	if (IS_ERR(pp->dbi_base))
488	return PTR_ERR(pp->dbi_base);
489
490	/*
491	* We set these same and is used in pcie rd/wr_other_conf
492	* functions
493	*/
494	pp->va_cfg0_base = pp->dbi_base + SPACE0_REMOTE_CFG_OFFSET;
495	pp->va_cfg1_base = pp->va_cfg0_base;
496
497	/* Index 1 is the application reg. space address */
498	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
499	ks_pcie->app = *res;
500	ks_pcie->va_app_base = devm_ioremap_resource(pp->dev, res);
501	if (IS_ERR(ks_pcie->va_app_base))
502	return PTR_ERR(ks_pcie->va_app_base);
503
504	/* Create legacy IRQ domain */
505	ks_pcie->legacy_irq_domain =
506	irq_domain_add_linear(ks_pcie->legacy_intc_np,
507	MAX_LEGACY_IRQS,
508	&ks_dw_pcie_legacy_irq_domain_ops,
509	NULL);
510	if (!ks_pcie->legacy_irq_domain) {
511	dev_err(pp->dev, "Failed to add irq domain for legacy irqs\n");
512	return -EINVAL;
513	}
514
515	return dw_pcie_host_init(pp);
516	}