arch/arm/mach-cns3xxx/pcie.c - maze/linux - Git at Google

 /*
  * PCI-E support for CNS3xxx
  *
  * Copyright 2008 Cavium Networks
  *		  Richard Liu <richard.liu@caviumnetworks.com>
  * Copyright 2010 MontaVista Software, LLC.
  *		  Anton Vorontsov <avorontsov@mvista.com>
  *
  * This file 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/init.h>
 #include <linux/kernel.h>
 #include <linux/bug.h>
 #include <linux/pci.h>
 #include <linux/io.h>
 #include <linux/ioport.h>
 #include <linux/interrupt.h>
 #include <linux/ptrace.h>
 #include <asm/mach/map.h>
 #include <mach/cns3xxx.h>
 #include "core.h"

 enum cns3xxx_access_type {
 	CNS3XXX_HOST_TYPE = 0,
 	CNS3XXX_CFG0_TYPE,
 	CNS3XXX_CFG1_TYPE,
 	CNS3XXX_NUM_ACCESS_TYPES,
 };

 struct cns3xxx_pcie {
 	struct map_desc cfg_bases[CNS3XXX_NUM_ACCESS_TYPES];
 	unsigned int irqs[2];
 	struct resource res_io;
 	struct resource res_mem;
 	struct hw_pci hw_pci;

 	bool linked;
 };

 static struct cns3xxx_pcie cns3xxx_pcie[]; /* forward decl. */

 static struct cns3xxx_pcie *sysdata_to_cnspci(void *sysdata)
 {
 	struct pci_sys_data *root = sysdata;

 	return &cns3xxx_pcie[root->domain];
 }

 static struct cns3xxx_pcie *pdev_to_cnspci(struct pci_dev *dev)
 {
 	return sysdata_to_cnspci(dev->sysdata);
 }

 static struct cns3xxx_pcie *pbus_to_cnspci(struct pci_bus *bus)
 {
 	return sysdata_to_cnspci(bus->sysdata);
 }

 static void __iomem *cns3xxx_pci_cfg_base(struct pci_bus *bus,
 				  unsigned int devfn, int where)
 {
 	struct cns3xxx_pcie *cnspci = pbus_to_cnspci(bus);
 	int busno = bus->number;
 	int slot = PCI_SLOT(devfn);
 	int offset;
 	enum cns3xxx_access_type type;
 	void __iomem *base;

 	/* If there is no link, just show the CNS PCI bridge. */
 	if (!cnspci->linked && (busno > 0 || slot > 0))
 		return NULL;

 	/*
 	 * The CNS PCI bridge doesn't fit into the PCI hierarchy, though
 	 * we still want to access it. For this to work, we must place
 	 * the first device on the same bus as the CNS PCI bridge.
 	 */
 	if (busno == 0) {
 		if (slot > 1)
 			return NULL;
 		type = slot;
 	} else {
 		type = CNS3XXX_CFG1_TYPE;
 	}

 	base = (void __iomem *)cnspci->cfg_bases[type].virtual;
 	offset = ((busno & 0xf) << 20) | (devfn << 12) | (where & 0xffc);

 	return base + offset;
 }

 static int cns3xxx_pci_read_config(struct pci_bus *bus, unsigned int devfn,
 				   int where, int size, u32 *val)
 {
 	u32 v;
 	void __iomem *base;
 	u32 mask = (0x1ull << (size * 8)) - 1;
 	int shift = (where % 4) * 8;

 	base = cns3xxx_pci_cfg_base(bus, devfn, where);
 	if (!base) {
 		*val = 0xffffffff;
 		return PCIBIOS_SUCCESSFUL;
 	}

 	v = __raw_readl(base);

 	if (bus->number == 0 && devfn == 0 &&
 			(where & 0xffc) == PCI_CLASS_REVISION) {
 		/*
 		 * RC's class is 0xb, but Linux PCI driver needs 0x604
 		 * for a PCIe bridge. So we must fixup the class code
 		 * to 0x604 here.
 		 */
 		v &= 0xff;
 		v |= 0x604 << 16;
 	}

 	*val = (v >> shift) & mask;

 	return PCIBIOS_SUCCESSFUL;
 }

 static int cns3xxx_pci_write_config(struct pci_bus *bus, unsigned int devfn,
 				    int where, int size, u32 val)
 {
 	u32 v;
 	void __iomem *base;
 	u32 mask = (0x1ull << (size * 8)) - 1;
 	int shift = (where % 4) * 8;

 	base = cns3xxx_pci_cfg_base(bus, devfn, where);
 	if (!base)
 		return PCIBIOS_SUCCESSFUL;

 	v = __raw_readl(base);

 	v &= ~(mask << shift);
 	v |= (val & mask) << shift;

 	__raw_writel(v, base);

 	return PCIBIOS_SUCCESSFUL;
 }

 static int cns3xxx_pci_setup(int nr, struct pci_sys_data *sys)
 {
 	struct cns3xxx_pcie *cnspci = sysdata_to_cnspci(sys);
 	struct resource *res_io = &cnspci->res_io;
 	struct resource *res_mem = &cnspci->res_mem;
 	struct resource **sysres = sys->resource;

 	BUG_ON(request_resource(&iomem_resource, res_io) ||
 	       request_resource(&iomem_resource, res_mem));

 	sysres[0] = res_io;
 	sysres[1] = res_mem;

 	return 1;
 }

 static struct pci_ops cns3xxx_pcie_ops = {
 	.read = cns3xxx_pci_read_config,
 	.write = cns3xxx_pci_write_config,
 };

 static struct pci_bus *cns3xxx_pci_scan_bus(int nr, struct pci_sys_data *sys)
 {
 	return pci_scan_bus(sys->busnr, &cns3xxx_pcie_ops, sys);
 }

 static int cns3xxx_pcie_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
 {
 	struct cns3xxx_pcie *cnspci = pdev_to_cnspci(dev);
 	int irq = cnspci->irqs[slot];

 	pr_info("PCIe map irq: %04d:%02x:%02x.%02x slot %d, pin %d, irq: %d\n",
 		pci_domain_nr(dev->bus), dev->bus->number, PCI_SLOT(dev->devfn),
 		PCI_FUNC(dev->devfn), slot, pin, irq);

 	return irq;
 }

 static struct cns3xxx_pcie cns3xxx_pcie[] = {
 	[0] = {
 		.cfg_bases = {
 			[CNS3XXX_HOST_TYPE] = {
 				.virtual = CNS3XXX_PCIE0_HOST_BASE_VIRT,
 				.pfn = __phys_to_pfn(CNS3XXX_PCIE0_HOST_BASE),
 				.length = SZ_16M,
 				.type = MT_DEVICE,
 			},
 			[CNS3XXX_CFG0_TYPE] = {
 				.virtual = CNS3XXX_PCIE0_CFG0_BASE_VIRT,
 				.pfn = __phys_to_pfn(CNS3XXX_PCIE0_CFG0_BASE),
 				.length = SZ_16M,
 				.type = MT_DEVICE,
 			},
 			[CNS3XXX_CFG1_TYPE] = {
 				.virtual = CNS3XXX_PCIE0_CFG1_BASE_VIRT,
 				.pfn = __phys_to_pfn(CNS3XXX_PCIE0_CFG1_BASE),
 				.length = SZ_16M,
 				.type = MT_DEVICE,
 			},
 		},
 		.res_io = {
 			.name = "PCIe0 I/O space",
 			.start = CNS3XXX_PCIE0_IO_BASE,
 			.end = CNS3XXX_PCIE0_IO_BASE + SZ_16M - 1,
 			.flags = IORESOURCE_IO,
 		},
 		.res_mem = {
 			.name = "PCIe0 non-prefetchable",
 			.start = CNS3XXX_PCIE0_MEM_BASE,
 			.end = CNS3XXX_PCIE0_MEM_BASE + SZ_16M - 1,
 			.flags = IORESOURCE_MEM,
 		},
 		.irqs = { IRQ_CNS3XXX_PCIE0_RC, IRQ_CNS3XXX_PCIE0_DEVICE, },
 		.hw_pci = {
 			.domain = 0,
 			.swizzle = pci_std_swizzle,
 			.nr_controllers = 1,
 			.setup = cns3xxx_pci_setup,
 			.scan = cns3xxx_pci_scan_bus,
 			.map_irq = cns3xxx_pcie_map_irq,
 		},
 	},
 	[1] = {
 		.cfg_bases = {
 			[CNS3XXX_HOST_TYPE] = {
 				.virtual = CNS3XXX_PCIE1_HOST_BASE_VIRT,
 				.pfn = __phys_to_pfn(CNS3XXX_PCIE1_HOST_BASE),
 				.length = SZ_16M,
 				.type = MT_DEVICE,
 			},
 			[CNS3XXX_CFG0_TYPE] = {
 				.virtual = CNS3XXX_PCIE1_CFG0_BASE_VIRT,
 				.pfn = __phys_to_pfn(CNS3XXX_PCIE1_CFG0_BASE),
 				.length = SZ_16M,
 				.type = MT_DEVICE,
 			},
 			[CNS3XXX_CFG1_TYPE] = {
 				.virtual = CNS3XXX_PCIE1_CFG1_BASE_VIRT,
 				.pfn = __phys_to_pfn(CNS3XXX_PCIE1_CFG1_BASE),
 				.length = SZ_16M,
 				.type = MT_DEVICE,
 			},
 		},
 		.res_io = {
 			.name = "PCIe1 I/O space",
 			.start = CNS3XXX_PCIE1_IO_BASE,
 			.end = CNS3XXX_PCIE1_IO_BASE + SZ_16M - 1,
 			.flags = IORESOURCE_IO,
 		},
 		.res_mem = {
 			.name = "PCIe1 non-prefetchable",
 			.start = CNS3XXX_PCIE1_MEM_BASE,
 			.end = CNS3XXX_PCIE1_MEM_BASE + SZ_16M - 1,
 			.flags = IORESOURCE_MEM,
 		},
 		.irqs = { IRQ_CNS3XXX_PCIE1_RC, IRQ_CNS3XXX_PCIE1_DEVICE, },
 		.hw_pci = {
 			.domain = 1,
 			.swizzle = pci_std_swizzle,
 			.nr_controllers = 1,
 			.setup = cns3xxx_pci_setup,
 			.scan = cns3xxx_pci_scan_bus,
 			.map_irq = cns3xxx_pcie_map_irq,
 		},
 	},
 };

 static void __init cns3xxx_pcie_check_link(struct cns3xxx_pcie *cnspci)
 {
 	int port = cnspci->hw_pci.domain;
 	u32 reg;
 	unsigned long time;

 	reg = __raw_readl(MISC_PCIE_CTRL(port));
 	/*
 	 * Enable Application Request to 1, it will exit L1 automatically,
 	 * but when chip back, it will use another clock, still can use 0x1.
 	 */
 	reg |= 0x3;
 	__raw_writel(reg, MISC_PCIE_CTRL(port));

 	pr_info("PCIe: Port[%d] Enable PCIe LTSSM\n", port);
 	pr_info("PCIe: Port[%d] Check data link layer...", port);

 	time = jiffies;
 	while (1) {
 		reg = __raw_readl(MISC_PCIE_PM_DEBUG(port));
 		if (reg & 0x1) {
 			pr_info("Link up.\n");
 			cnspci->linked = 1;
 			break;
 		} else if (time_after(jiffies, time + 50)) {
 			pr_info("Device not found.\n");
 			break;
 		}
 	}
 }

 static void __init cns3xxx_pcie_hw_init(struct cns3xxx_pcie *cnspci)
 {
 	int port = cnspci->hw_pci.domain;
 	struct pci_sys_data sd = {
 		.domain = port,
 	};
 	struct pci_bus bus = {
 		.number = 0,
 		.ops = &cns3xxx_pcie_ops,
 		.sysdata = &sd,
 	};
 	u32 io_base = cnspci->res_io.start >> 16;
 	u32 mem_base = cnspci->res_mem.start >> 16;
 	u32 host_base = cnspci->cfg_bases[CNS3XXX_HOST_TYPE].pfn;
 	u32 cfg0_base = cnspci->cfg_bases[CNS3XXX_CFG0_TYPE].pfn;
 	u32 devfn = 0;
 	u8 tmp8;
 	u16 pos;
 	u16 dc;

 	host_base = (__pfn_to_phys(host_base) - 1) >> 16;
 	cfg0_base = (__pfn_to_phys(cfg0_base) - 1) >> 16;

 	pci_bus_write_config_byte(&bus, devfn, PCI_PRIMARY_BUS, 0);
 	pci_bus_write_config_byte(&bus, devfn, PCI_SECONDARY_BUS, 1);
 	pci_bus_write_config_byte(&bus, devfn, PCI_SUBORDINATE_BUS, 1);

 	pci_bus_read_config_byte(&bus, devfn, PCI_PRIMARY_BUS, &tmp8);
 	pci_bus_read_config_byte(&bus, devfn, PCI_SECONDARY_BUS, &tmp8);
 	pci_bus_read_config_byte(&bus, devfn, PCI_SUBORDINATE_BUS, &tmp8);

 	pci_bus_write_config_word(&bus, devfn, PCI_MEMORY_BASE, mem_base);
 	pci_bus_write_config_word(&bus, devfn, PCI_MEMORY_LIMIT, host_base);
 	pci_bus_write_config_word(&bus, devfn, PCI_IO_BASE_UPPER16, io_base);
 	pci_bus_write_config_word(&bus, devfn, PCI_IO_LIMIT_UPPER16, cfg0_base);

 	if (!cnspci->linked)
 		return;

 	/* Set Device Max_Read_Request_Size to 128 byte */
 	devfn = PCI_DEVFN(1, 0);
 	pos = pci_bus_find_capability(&bus, devfn, PCI_CAP_ID_EXP);
 	pci_bus_read_config_word(&bus, devfn, pos + PCI_EXP_DEVCTL, &dc);
 	dc &= ~(0x3 << 12);	/* Clear Device Control Register [14:12] */
 	pci_bus_write_config_word(&bus, devfn, pos + PCI_EXP_DEVCTL, dc);
 	pci_bus_read_config_word(&bus, devfn, pos + PCI_EXP_DEVCTL, &dc);
 	if (!(dc & (0x3 << 12)))
 		pr_info("PCIe: Set Device Max_Read_Request_Size to 128 byte\n");

 	/* Disable PCIe0 Interrupt Mask INTA to INTD */
 	__raw_writel(~0x3FFF, MISC_PCIE_INT_MASK(port));
 }

 static int cns3xxx_pcie_abort_handler(unsigned long addr, unsigned int fsr,
 				      struct pt_regs *regs)
 {
 	if (fsr & (1 << 10))
 		regs->ARM_pc += 4;
 	return 0;
 }

 static int __init cns3xxx_pcie_init(void)
 {
 	int i;

 	hook_fault_code(16 + 6, cns3xxx_pcie_abort_handler, SIGBUS, 0,
 			"imprecise external abort");

 	for (i = 0; i < ARRAY_SIZE(cns3xxx_pcie); i++) {
 		iotable_init(cns3xxx_pcie[i].cfg_bases,
 			     ARRAY_SIZE(cns3xxx_pcie[i].cfg_bases));
 		cns3xxx_pwr_clk_en(0x1 << PM_CLK_GATE_REG_OFFSET_PCIE(i));
 		cns3xxx_pwr_soft_rst(0x1 << PM_SOFT_RST_REG_OFFST_PCIE(i));
 		cns3xxx_pcie_check_link(&cns3xxx_pcie[i]);
 		cns3xxx_pcie_hw_init(&cns3xxx_pcie[i]);
 		pci_common_init(&cns3xxx_pcie[i].hw_pci);
 	}

 	pci_assign_unassigned_resources();

 	return 0;
 }
 device_initcall(cns3xxx_pcie_init);
	/*
	* PCI-E support for CNS3xxx
	*
	* Copyright 2008 Cavium Networks
	* Richard Liu <richard.liu@caviumnetworks.com>
	* Copyright 2010 MontaVista Software, LLC.
	* Anton Vorontsov <avorontsov@mvista.com>
	*
	* This file 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/init.h>
	#include <linux/kernel.h>
	#include <linux/bug.h>
	#include <linux/pci.h>
	#include <linux/io.h>
	#include <linux/ioport.h>
	#include <linux/interrupt.h>
	#include <linux/ptrace.h>
	#include <asm/mach/map.h>
	#include <mach/cns3xxx.h>
	#include "core.h"

	enum cns3xxx_access_type {
	CNS3XXX_HOST_TYPE = 0,
	CNS3XXX_CFG0_TYPE,
	CNS3XXX_CFG1_TYPE,
	CNS3XXX_NUM_ACCESS_TYPES,
	};

	struct cns3xxx_pcie {
	struct map_desc cfg_bases[CNS3XXX_NUM_ACCESS_TYPES];
	unsigned int irqs[2];
	struct resource res_io;
	struct resource res_mem;
	struct hw_pci hw_pci;

	bool linked;
	};

	static struct cns3xxx_pcie cns3xxx_pcie[]; /* forward decl. */

	static struct cns3xxx_pcie sysdata_to_cnspci(void sysdata)
	{
	struct pci_sys_data *root = sysdata;

	return &cns3xxx_pcie[root->domain];
	}

	static struct cns3xxx_pcie pdev_to_cnspci(struct pci_dev dev)
	{
	return sysdata_to_cnspci(dev->sysdata);
	}

	static struct cns3xxx_pcie pbus_to_cnspci(struct pci_bus bus)
	{
	return sysdata_to_cnspci(bus->sysdata);
	}

	static void __iomem cns3xxx_pci_cfg_base(struct pci_bus bus,
	unsigned int devfn, int where)
	{
	struct cns3xxx_pcie *cnspci = pbus_to_cnspci(bus);
	int busno = bus->number;
	int slot = PCI_SLOT(devfn);
	int offset;
	enum cns3xxx_access_type type;
	void __iomem *base;

	/* If there is no link, just show the CNS PCI bridge. */
	if (!cnspci->linked && (busno > 0 \|\| slot > 0))
	return NULL;

	/*
	* The CNS PCI bridge doesn't fit into the PCI hierarchy, though
	* we still want to access it. For this to work, we must place
	* the first device on the same bus as the CNS PCI bridge.
	*/
	if (busno == 0) {
	if (slot > 1)
	return NULL;
	type = slot;
	} else {
	type = CNS3XXX_CFG1_TYPE;
	}

	base = (void __iomem *)cnspci->cfg_bases[type].virtual;
	offset = ((busno & 0xf) << 20) \| (devfn << 12) \| (where & 0xffc);

	return base + offset;
	}

	static int cns3xxx_pci_read_config(struct pci_bus *bus, unsigned int devfn,
	int where, int size, u32 *val)
	{
	u32 v;
	void __iomem *base;
	u32 mask = (0x1ull << (size * 8)) - 1;
	int shift = (where % 4) * 8;

	base = cns3xxx_pci_cfg_base(bus, devfn, where);
	if (!base) {
	*val = 0xffffffff;
	return PCIBIOS_SUCCESSFUL;
	}

	v = __raw_readl(base);

	if (bus->number == 0 && devfn == 0 &&
	(where & 0xffc) == PCI_CLASS_REVISION) {
	/*
	* RC's class is 0xb, but Linux PCI driver needs 0x604
	* for a PCIe bridge. So we must fixup the class code
	* to 0x604 here.
	*/
	v &= 0xff;
	v \|= 0x604 << 16;
	}

	*val = (v >> shift) & mask;

	return PCIBIOS_SUCCESSFUL;
	}

	static int cns3xxx_pci_write_config(struct pci_bus *bus, unsigned int devfn,
	int where, int size, u32 val)
	{
	u32 v;
	void __iomem *base;
	u32 mask = (0x1ull << (size * 8)) - 1;
	int shift = (where % 4) * 8;

	base = cns3xxx_pci_cfg_base(bus, devfn, where);
	if (!base)
	return PCIBIOS_SUCCESSFUL;

	v = __raw_readl(base);

	v &= ~(mask << shift);
	v \|= (val & mask) << shift;

	__raw_writel(v, base);

	return PCIBIOS_SUCCESSFUL;
	}

	static int cns3xxx_pci_setup(int nr, struct pci_sys_data *sys)
	{
	struct cns3xxx_pcie *cnspci = sysdata_to_cnspci(sys);
	struct resource *res_io = &cnspci->res_io;
	struct resource *res_mem = &cnspci->res_mem;
	struct resource **sysres = sys->resource;

	BUG_ON(request_resource(&iomem_resource, res_io) \|\|
	request_resource(&iomem_resource, res_mem));

	sysres[0] = res_io;
	sysres[1] = res_mem;

	return 1;
	}

	static struct pci_ops cns3xxx_pcie_ops = {
	.read = cns3xxx_pci_read_config,
	.write = cns3xxx_pci_write_config,
	};

	static struct pci_bus cns3xxx_pci_scan_bus(int nr, struct pci_sys_data sys)
	{
	return pci_scan_bus(sys->busnr, &cns3xxx_pcie_ops, sys);
	}

	static int cns3xxx_pcie_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
	{
	struct cns3xxx_pcie *cnspci = pdev_to_cnspci(dev);
	int irq = cnspci->irqs[slot];

	pr_info("PCIe map irq: %04d:%02x:%02x.%02x slot %d, pin %d, irq: %d\n",
	pci_domain_nr(dev->bus), dev->bus->number, PCI_SLOT(dev->devfn),
	PCI_FUNC(dev->devfn), slot, pin, irq);

	return irq;
	}

	static struct cns3xxx_pcie cns3xxx_pcie[] = {
	[0] = {
	.cfg_bases = {
	[CNS3XXX_HOST_TYPE] = {
	.virtual = CNS3XXX_PCIE0_HOST_BASE_VIRT,
	.pfn = __phys_to_pfn(CNS3XXX_PCIE0_HOST_BASE),
	.length = SZ_16M,
	.type = MT_DEVICE,
	},
	[CNS3XXX_CFG0_TYPE] = {
	.virtual = CNS3XXX_PCIE0_CFG0_BASE_VIRT,
	.pfn = __phys_to_pfn(CNS3XXX_PCIE0_CFG0_BASE),
	.length = SZ_16M,
	.type = MT_DEVICE,
	},
	[CNS3XXX_CFG1_TYPE] = {
	.virtual = CNS3XXX_PCIE0_CFG1_BASE_VIRT,
	.pfn = __phys_to_pfn(CNS3XXX_PCIE0_CFG1_BASE),
	.length = SZ_16M,
	.type = MT_DEVICE,
	},
	},
	.res_io = {
	.name = "PCIe0 I/O space",
	.start = CNS3XXX_PCIE0_IO_BASE,
	.end = CNS3XXX_PCIE0_IO_BASE + SZ_16M - 1,
	.flags = IORESOURCE_IO,
	},
	.res_mem = {
	.name = "PCIe0 non-prefetchable",
	.start = CNS3XXX_PCIE0_MEM_BASE,
	.end = CNS3XXX_PCIE0_MEM_BASE + SZ_16M - 1,
	.flags = IORESOURCE_MEM,
	},
	.irqs = { IRQ_CNS3XXX_PCIE0_RC, IRQ_CNS3XXX_PCIE0_DEVICE, },
	.hw_pci = {
	.domain = 0,
	.swizzle = pci_std_swizzle,
	.nr_controllers = 1,
	.setup = cns3xxx_pci_setup,
	.scan = cns3xxx_pci_scan_bus,
	.map_irq = cns3xxx_pcie_map_irq,
	},
	},
	[1] = {
	.cfg_bases = {
	[CNS3XXX_HOST_TYPE] = {
	.virtual = CNS3XXX_PCIE1_HOST_BASE_VIRT,
	.pfn = __phys_to_pfn(CNS3XXX_PCIE1_HOST_BASE),
	.length = SZ_16M,
	.type = MT_DEVICE,
	},
	[CNS3XXX_CFG0_TYPE] = {
	.virtual = CNS3XXX_PCIE1_CFG0_BASE_VIRT,
	.pfn = __phys_to_pfn(CNS3XXX_PCIE1_CFG0_BASE),
	.length = SZ_16M,
	.type = MT_DEVICE,
	},
	[CNS3XXX_CFG1_TYPE] = {
	.virtual = CNS3XXX_PCIE1_CFG1_BASE_VIRT,
	.pfn = __phys_to_pfn(CNS3XXX_PCIE1_CFG1_BASE),
	.length = SZ_16M,
	.type = MT_DEVICE,
	},
	},
	.res_io = {
	.name = "PCIe1 I/O space",
	.start = CNS3XXX_PCIE1_IO_BASE,
	.end = CNS3XXX_PCIE1_IO_BASE + SZ_16M - 1,
	.flags = IORESOURCE_IO,
	},
	.res_mem = {
	.name = "PCIe1 non-prefetchable",
	.start = CNS3XXX_PCIE1_MEM_BASE,
	.end = CNS3XXX_PCIE1_MEM_BASE + SZ_16M - 1,
	.flags = IORESOURCE_MEM,
	},
	.irqs = { IRQ_CNS3XXX_PCIE1_RC, IRQ_CNS3XXX_PCIE1_DEVICE, },
	.hw_pci = {
	.domain = 1,
	.swizzle = pci_std_swizzle,
	.nr_controllers = 1,
	.setup = cns3xxx_pci_setup,
	.scan = cns3xxx_pci_scan_bus,
	.map_irq = cns3xxx_pcie_map_irq,
	},
	},
	};

	static void __init cns3xxx_pcie_check_link(struct cns3xxx_pcie *cnspci)
	{
	int port = cnspci->hw_pci.domain;
	u32 reg;
	unsigned long time;

	reg = __raw_readl(MISC_PCIE_CTRL(port));
	/*
	* Enable Application Request to 1, it will exit L1 automatically,
	* but when chip back, it will use another clock, still can use 0x1.
	*/
	reg \|= 0x3;
	__raw_writel(reg, MISC_PCIE_CTRL(port));

	pr_info("PCIe: Port[%d] Enable PCIe LTSSM\n", port);
	pr_info("PCIe: Port[%d] Check data link layer...", port);

	time = jiffies;
	while (1) {
	reg = __raw_readl(MISC_PCIE_PM_DEBUG(port));
	if (reg & 0x1) {
	pr_info("Link up.\n");
	cnspci->linked = 1;
	break;
	} else if (time_after(jiffies, time + 50)) {
	pr_info("Device not found.\n");
	break;
	}
	}
	}

	static void __init cns3xxx_pcie_hw_init(struct cns3xxx_pcie *cnspci)
	{
	int port = cnspci->hw_pci.domain;
	struct pci_sys_data sd = {
	.domain = port,
	};
	struct pci_bus bus = {
	.number = 0,
	.ops = &cns3xxx_pcie_ops,
	.sysdata = &sd,
	};
	u32 io_base = cnspci->res_io.start >> 16;
	u32 mem_base = cnspci->res_mem.start >> 16;
	u32 host_base = cnspci->cfg_bases[CNS3XXX_HOST_TYPE].pfn;
	u32 cfg0_base = cnspci->cfg_bases[CNS3XXX_CFG0_TYPE].pfn;
	u32 devfn = 0;
	u8 tmp8;
	u16 pos;
	u16 dc;

	host_base = (__pfn_to_phys(host_base) - 1) >> 16;
	cfg0_base = (__pfn_to_phys(cfg0_base) - 1) >> 16;

	pci_bus_write_config_byte(&bus, devfn, PCI_PRIMARY_BUS, 0);
	pci_bus_write_config_byte(&bus, devfn, PCI_SECONDARY_BUS, 1);
	pci_bus_write_config_byte(&bus, devfn, PCI_SUBORDINATE_BUS, 1);

	pci_bus_read_config_byte(&bus, devfn, PCI_PRIMARY_BUS, &tmp8);
	pci_bus_read_config_byte(&bus, devfn, PCI_SECONDARY_BUS, &tmp8);
	pci_bus_read_config_byte(&bus, devfn, PCI_SUBORDINATE_BUS, &tmp8);

	pci_bus_write_config_word(&bus, devfn, PCI_MEMORY_BASE, mem_base);
	pci_bus_write_config_word(&bus, devfn, PCI_MEMORY_LIMIT, host_base);
	pci_bus_write_config_word(&bus, devfn, PCI_IO_BASE_UPPER16, io_base);
	pci_bus_write_config_word(&bus, devfn, PCI_IO_LIMIT_UPPER16, cfg0_base);

	if (!cnspci->linked)
	return;

	/* Set Device Max_Read_Request_Size to 128 byte */
	devfn = PCI_DEVFN(1, 0);
	pos = pci_bus_find_capability(&bus, devfn, PCI_CAP_ID_EXP);
	pci_bus_read_config_word(&bus, devfn, pos + PCI_EXP_DEVCTL, &dc);
	dc &= ~(0x3 << 12); /* Clear Device Control Register [14:12] */
	pci_bus_write_config_word(&bus, devfn, pos + PCI_EXP_DEVCTL, dc);
	pci_bus_read_config_word(&bus, devfn, pos + PCI_EXP_DEVCTL, &dc);
	if (!(dc & (0x3 << 12)))
	pr_info("PCIe: Set Device Max_Read_Request_Size to 128 byte\n");

	/* Disable PCIe0 Interrupt Mask INTA to INTD */
	__raw_writel(~0x3FFF, MISC_PCIE_INT_MASK(port));
	}

	static int cns3xxx_pcie_abort_handler(unsigned long addr, unsigned int fsr,
	struct pt_regs *regs)
	{
	if (fsr & (1 << 10))
	regs->ARM_pc += 4;
	return 0;
	}

	static int __init cns3xxx_pcie_init(void)
	{
	int i;

	hook_fault_code(16 + 6, cns3xxx_pcie_abort_handler, SIGBUS, 0,
	"imprecise external abort");

	for (i = 0; i < ARRAY_SIZE(cns3xxx_pcie); i++) {
	iotable_init(cns3xxx_pcie[i].cfg_bases,
	ARRAY_SIZE(cns3xxx_pcie[i].cfg_bases));
	cns3xxx_pwr_clk_en(0x1 << PM_CLK_GATE_REG_OFFSET_PCIE(i));
	cns3xxx_pwr_soft_rst(0x1 << PM_SOFT_RST_REG_OFFST_PCIE(i));
	cns3xxx_pcie_check_link(&cns3xxx_pcie[i]);
	cns3xxx_pcie_hw_init(&cns3xxx_pcie[i]);
	pci_common_init(&cns3xxx_pcie[i].hw_pci);
	}

	pci_assign_unassigned_resources();

	return 0;
	}
	device_initcall(cns3xxx_pcie_init);