drivers/pci/dwc/pcie-designware.c - arm/linux - Git at Google

 /*
  * Synopsys DesignWare PCIe host controller driver
  *
  * Copyright (C) 2013 Samsung Electronics Co., Ltd.
  *		http://www.samsung.com
  *
  * Author: Jingoo Han <jg1.han@samsung.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/delay.h>
 #include <linux/of.h>
 #include <linux/types.h>

 #include "pcie-designware.h"

 /* PCIe Port Logic registers */
 #define PLR_OFFSET			0x700
 #define PCIE_PHY_DEBUG_R1		(PLR_OFFSET + 0x2c)
 #define PCIE_PHY_DEBUG_R1_LINK_UP	(0x1 << 4)
 #define PCIE_PHY_DEBUG_R1_LINK_IN_TRAINING	(0x1 << 29)

 int dw_pcie_read(void __iomem *addr, int size, u32 *val)
 {
 	if ((uintptr_t)addr & (size - 1)) {
 		*val = 0;
 		return PCIBIOS_BAD_REGISTER_NUMBER;
 	}

 	if (size == 4) {
 		*val = readl(addr);
 	} else if (size == 2) {
 		*val = readw(addr);
 	} else if (size == 1) {
 		*val = readb(addr);
 	} else {
 		*val = 0;
 		return PCIBIOS_BAD_REGISTER_NUMBER;
 	}

 	return PCIBIOS_SUCCESSFUL;
 }

 int dw_pcie_write(void __iomem *addr, int size, u32 val)
 {
 	if ((uintptr_t)addr & (size - 1))
 		return PCIBIOS_BAD_REGISTER_NUMBER;

 	if (size == 4)
 		writel(val, addr);
 	else if (size == 2)
 		writew(val, addr);
 	else if (size == 1)
 		writeb(val, addr);
 	else
 		return PCIBIOS_BAD_REGISTER_NUMBER;

 	return PCIBIOS_SUCCESSFUL;
 }

 u32 __dw_pcie_read_dbi(struct dw_pcie *pci, void __iomem *base, u32 reg,
 		       size_t size)
 {
 	int ret;
 	u32 val;

 	if (pci->ops->read_dbi)
 		return pci->ops->read_dbi(pci, base, reg, size);

 	ret = dw_pcie_read(base + reg, size, &val);
 	if (ret)
 		dev_err(pci->dev, "read DBI address failed\n");

 	return val;
 }

 void __dw_pcie_write_dbi(struct dw_pcie *pci, void __iomem *base, u32 reg,
 			 size_t size, u32 val)
 {
 	int ret;

 	if (pci->ops->write_dbi) {
 		pci->ops->write_dbi(pci, base, reg, size, val);
 		return;
 	}

 	ret = dw_pcie_write(base + reg, size, val);
 	if (ret)
 		dev_err(pci->dev, "write DBI address failed\n");
 }

 static u32 dw_pcie_readl_ob_unroll(struct dw_pcie *pci, u32 index, u32 reg)
 {
 	u32 offset = PCIE_GET_ATU_OUTB_UNR_REG_OFFSET(index);

 	return dw_pcie_readl_dbi(pci, offset + reg);
 }

 static void dw_pcie_writel_ob_unroll(struct dw_pcie *pci, u32 index, u32 reg,
 				     u32 val)
 {
 	u32 offset = PCIE_GET_ATU_OUTB_UNR_REG_OFFSET(index);

 	dw_pcie_writel_dbi(pci, offset + reg, val);
 }

 static void dw_pcie_prog_outbound_atu_unroll(struct dw_pcie *pci, int index,
 					     int type, u64 cpu_addr,
 					     u64 pci_addr, u32 size)
 {
 	u32 retries, val;

 	dw_pcie_writel_ob_unroll(pci, index, PCIE_ATU_UNR_LOWER_BASE,
 				 lower_32_bits(cpu_addr));
 	dw_pcie_writel_ob_unroll(pci, index, PCIE_ATU_UNR_UPPER_BASE,
 				 upper_32_bits(cpu_addr));
 	dw_pcie_writel_ob_unroll(pci, index, PCIE_ATU_UNR_LIMIT,
 				 lower_32_bits(cpu_addr + size - 1));
 	dw_pcie_writel_ob_unroll(pci, index, PCIE_ATU_UNR_LOWER_TARGET,
 				 lower_32_bits(pci_addr));
 	dw_pcie_writel_ob_unroll(pci, index, PCIE_ATU_UNR_UPPER_TARGET,
 				 upper_32_bits(pci_addr));
 	dw_pcie_writel_ob_unroll(pci, index, PCIE_ATU_UNR_REGION_CTRL1,
 				 type);
 	dw_pcie_writel_ob_unroll(pci, index, PCIE_ATU_UNR_REGION_CTRL2,
 				 PCIE_ATU_ENABLE);

 	/*
 	 * Make sure ATU enable takes effect before any subsequent config
 	 * and I/O accesses.
 	 */
 	for (retries = 0; retries < LINK_WAIT_MAX_IATU_RETRIES; retries++) {
 		val = dw_pcie_readl_ob_unroll(pci, index,
 					      PCIE_ATU_UNR_REGION_CTRL2);
 		if (val & PCIE_ATU_ENABLE)
 			return;

 		usleep_range(LINK_WAIT_IATU_MIN, LINK_WAIT_IATU_MAX);
 	}
 	dev_err(pci->dev, "outbound iATU is not being enabled\n");
 }

 void dw_pcie_prog_outbound_atu(struct dw_pcie *pci, int index, int type,
 			       u64 cpu_addr, u64 pci_addr, u32 size)
 {
 	u32 retries, val;

 	if (pci->ops->cpu_addr_fixup)
 		cpu_addr = pci->ops->cpu_addr_fixup(cpu_addr);

 	if (pci->iatu_unroll_enabled) {
 		dw_pcie_prog_outbound_atu_unroll(pci, index, type, cpu_addr,
 						 pci_addr, size);
 		return;
 	}

 	dw_pcie_writel_dbi(pci, PCIE_ATU_VIEWPORT,
 			   PCIE_ATU_REGION_OUTBOUND | index);
 	dw_pcie_writel_dbi(pci, PCIE_ATU_LOWER_BASE,
 			   lower_32_bits(cpu_addr));
 	dw_pcie_writel_dbi(pci, PCIE_ATU_UPPER_BASE,
 			   upper_32_bits(cpu_addr));
 	dw_pcie_writel_dbi(pci, PCIE_ATU_LIMIT,
 			   lower_32_bits(cpu_addr + size - 1));
 	dw_pcie_writel_dbi(pci, PCIE_ATU_LOWER_TARGET,
 			   lower_32_bits(pci_addr));
 	dw_pcie_writel_dbi(pci, PCIE_ATU_UPPER_TARGET,
 			   upper_32_bits(pci_addr));
 	dw_pcie_writel_dbi(pci, PCIE_ATU_CR1, type);
 	dw_pcie_writel_dbi(pci, PCIE_ATU_CR2, PCIE_ATU_ENABLE);

 	/*
 	 * Make sure ATU enable takes effect before any subsequent config
 	 * and I/O accesses.
 	 */
 	for (retries = 0; retries < LINK_WAIT_MAX_IATU_RETRIES; retries++) {
 		val = dw_pcie_readl_dbi(pci, PCIE_ATU_CR2);
 		if (val & PCIE_ATU_ENABLE)
 			return;

 		usleep_range(LINK_WAIT_IATU_MIN, LINK_WAIT_IATU_MAX);
 	}
 	dev_err(pci->dev, "outbound iATU is not being enabled\n");
 }

 static u32 dw_pcie_readl_ib_unroll(struct dw_pcie *pci, u32 index, u32 reg)
 {
 	u32 offset = PCIE_GET_ATU_INB_UNR_REG_OFFSET(index);

 	return dw_pcie_readl_dbi(pci, offset + reg);
 }

 static void dw_pcie_writel_ib_unroll(struct dw_pcie *pci, u32 index, u32 reg,
 				     u32 val)
 {
 	u32 offset = PCIE_GET_ATU_INB_UNR_REG_OFFSET(index);

 	dw_pcie_writel_dbi(pci, offset + reg, val);
 }

 static int dw_pcie_prog_inbound_atu_unroll(struct dw_pcie *pci, int index,
 					   int bar, u64 cpu_addr,
 					   enum dw_pcie_as_type as_type)
 {
 	int type;
 	u32 retries, val;

 	dw_pcie_writel_ib_unroll(pci, index, PCIE_ATU_UNR_LOWER_TARGET,
 				 lower_32_bits(cpu_addr));
 	dw_pcie_writel_ib_unroll(pci, index, PCIE_ATU_UNR_UPPER_TARGET,
 				 upper_32_bits(cpu_addr));

 	switch (as_type) {
 	case DW_PCIE_AS_MEM:
 		type = PCIE_ATU_TYPE_MEM;
 		break;
 	case DW_PCIE_AS_IO:
 		type = PCIE_ATU_TYPE_IO;
 		break;
 	default:
 		return -EINVAL;
 	}

 	dw_pcie_writel_ib_unroll(pci, index, PCIE_ATU_UNR_REGION_CTRL1, type);
 	dw_pcie_writel_ib_unroll(pci, index, PCIE_ATU_UNR_REGION_CTRL2,
 				 PCIE_ATU_ENABLE |
 				 PCIE_ATU_BAR_MODE_ENABLE | (bar << 8));

 	/*
 	 * Make sure ATU enable takes effect before any subsequent config
 	 * and I/O accesses.
 	 */
 	for (retries = 0; retries < LINK_WAIT_MAX_IATU_RETRIES; retries++) {
 		val = dw_pcie_readl_ib_unroll(pci, index,
 					      PCIE_ATU_UNR_REGION_CTRL2);
 		if (val & PCIE_ATU_ENABLE)
 			return 0;

 		usleep_range(LINK_WAIT_IATU_MIN, LINK_WAIT_IATU_MAX);
 	}
 	dev_err(pci->dev, "inbound iATU is not being enabled\n");

 	return -EBUSY;
 }

 int dw_pcie_prog_inbound_atu(struct dw_pcie *pci, int index, int bar,
 			     u64 cpu_addr, enum dw_pcie_as_type as_type)
 {
 	int type;
 	u32 retries, val;

 	if (pci->iatu_unroll_enabled)
 		return dw_pcie_prog_inbound_atu_unroll(pci, index, bar,
 						       cpu_addr, as_type);

 	dw_pcie_writel_dbi(pci, PCIE_ATU_VIEWPORT, PCIE_ATU_REGION_INBOUND |
 			   index);
 	dw_pcie_writel_dbi(pci, PCIE_ATU_LOWER_TARGET, lower_32_bits(cpu_addr));
 	dw_pcie_writel_dbi(pci, PCIE_ATU_UPPER_TARGET, upper_32_bits(cpu_addr));

 	switch (as_type) {
 	case DW_PCIE_AS_MEM:
 		type = PCIE_ATU_TYPE_MEM;
 		break;
 	case DW_PCIE_AS_IO:
 		type = PCIE_ATU_TYPE_IO;
 		break;
 	default:
 		return -EINVAL;
 	}

 	dw_pcie_writel_dbi(pci, PCIE_ATU_CR1, type);
 	dw_pcie_writel_dbi(pci, PCIE_ATU_CR2, PCIE_ATU_ENABLE
 			   | PCIE_ATU_BAR_MODE_ENABLE | (bar << 8));

 	/*
 	 * Make sure ATU enable takes effect before any subsequent config
 	 * and I/O accesses.
 	 */
 	for (retries = 0; retries < LINK_WAIT_MAX_IATU_RETRIES; retries++) {
 		val = dw_pcie_readl_dbi(pci, PCIE_ATU_CR2);
 		if (val & PCIE_ATU_ENABLE)
 			return 0;

 		usleep_range(LINK_WAIT_IATU_MIN, LINK_WAIT_IATU_MAX);
 	}
 	dev_err(pci->dev, "inbound iATU is not being enabled\n");

 	return -EBUSY;
 }

 void dw_pcie_disable_atu(struct dw_pcie *pci, int index,
 			 enum dw_pcie_region_type type)
 {
 	int region;

 	switch (type) {
 	case DW_PCIE_REGION_INBOUND:
 		region = PCIE_ATU_REGION_INBOUND;
 		break;
 	case DW_PCIE_REGION_OUTBOUND:
 		region = PCIE_ATU_REGION_OUTBOUND;
 		break;
 	default:
 		return;
 	}

 	dw_pcie_writel_dbi(pci, PCIE_ATU_VIEWPORT, region | index);
 	dw_pcie_writel_dbi(pci, PCIE_ATU_CR2, ~PCIE_ATU_ENABLE);
 }

 int dw_pcie_wait_for_link(struct dw_pcie *pci)
 {
 	int retries;

 	/* check if the link is up or not */
 	for (retries = 0; retries < LINK_WAIT_MAX_RETRIES; retries++) {
 		if (dw_pcie_link_up(pci)) {
 			dev_info(pci->dev, "link up\n");
 			return 0;
 		}
 		usleep_range(LINK_WAIT_USLEEP_MIN, LINK_WAIT_USLEEP_MAX);
 	}

 	dev_err(pci->dev, "phy link never came up\n");

 	return -ETIMEDOUT;
 }

 int dw_pcie_link_up(struct dw_pcie *pci)
 {
 	u32 val;

 	if (pci->ops->link_up)
 		return pci->ops->link_up(pci);

 	val = readl(pci->dbi_base + PCIE_PHY_DEBUG_R1);
 	return ((val & PCIE_PHY_DEBUG_R1_LINK_UP) &&
 		(!(val & PCIE_PHY_DEBUG_R1_LINK_IN_TRAINING)));
 }

 void dw_pcie_setup(struct dw_pcie *pci)
 {
 	int ret;
 	u32 val;
 	u32 lanes;
 	struct device *dev = pci->dev;
 	struct device_node *np = dev->of_node;

 	ret = of_property_read_u32(np, "num-lanes", &lanes);
 	if (ret)
 		lanes = 0;

 	/* set the number of lanes */
 	val = dw_pcie_readl_dbi(pci, PCIE_PORT_LINK_CONTROL);
 	val &= ~PORT_LINK_MODE_MASK;
 	switch (lanes) {
 	case 1:
 		val |= PORT_LINK_MODE_1_LANES;
 		break;
 	case 2:
 		val |= PORT_LINK_MODE_2_LANES;
 		break;
 	case 4:
 		val |= PORT_LINK_MODE_4_LANES;
 		break;
 	case 8:
 		val |= PORT_LINK_MODE_8_LANES;
 		break;
 	default:
 		dev_err(pci->dev, "num-lanes %u: invalid value\n", lanes);
 		return;
 	}
 	dw_pcie_writel_dbi(pci, PCIE_PORT_LINK_CONTROL, val);

 	/* set link width speed control register */
 	val = dw_pcie_readl_dbi(pci, PCIE_LINK_WIDTH_SPEED_CONTROL);
 	val &= ~PORT_LOGIC_LINK_WIDTH_MASK;
 	switch (lanes) {
 	case 1:
 		val |= PORT_LOGIC_LINK_WIDTH_1_LANES;
 		break;
 	case 2:
 		val |= PORT_LOGIC_LINK_WIDTH_2_LANES;
 		break;
 	case 4:
 		val |= PORT_LOGIC_LINK_WIDTH_4_LANES;
 		break;
 	case 8:
 		val |= PORT_LOGIC_LINK_WIDTH_8_LANES;
 		break;
 	}
 	dw_pcie_writel_dbi(pci, PCIE_LINK_WIDTH_SPEED_CONTROL, val);
 }
	/*
	* Synopsys DesignWare PCIe host controller driver
	*
	* Copyright (C) 2013 Samsung Electronics Co., Ltd.
	* http://www.samsung.com
	*
	* Author: Jingoo Han <jg1.han@samsung.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/delay.h>
	#include <linux/of.h>
	#include <linux/types.h>

	#include "pcie-designware.h"

	/* PCIe Port Logic registers */
	#define PLR_OFFSET 0x700
	#define PCIE_PHY_DEBUG_R1 (PLR_OFFSET + 0x2c)
	#define PCIE_PHY_DEBUG_R1_LINK_UP (0x1 << 4)
	#define PCIE_PHY_DEBUG_R1_LINK_IN_TRAINING (0x1 << 29)

	int dw_pcie_read(void __iomem addr, int size, u32 val)
	{
	if ((uintptr_t)addr & (size - 1)) {
	*val = 0;
	return PCIBIOS_BAD_REGISTER_NUMBER;
	}

	if (size == 4) {
	*val = readl(addr);
	} else if (size == 2) {
	*val = readw(addr);
	} else if (size == 1) {
	*val = readb(addr);
	} else {
	*val = 0;
	return PCIBIOS_BAD_REGISTER_NUMBER;
	}

	return PCIBIOS_SUCCESSFUL;
	}

	int dw_pcie_write(void __iomem *addr, int size, u32 val)
	{
	if ((uintptr_t)addr & (size - 1))
	return PCIBIOS_BAD_REGISTER_NUMBER;

	if (size == 4)
	writel(val, addr);
	else if (size == 2)
	writew(val, addr);
	else if (size == 1)
	writeb(val, addr);
	else
	return PCIBIOS_BAD_REGISTER_NUMBER;

	return PCIBIOS_SUCCESSFUL;
	}

	u32 __dw_pcie_read_dbi(struct dw_pcie pci, void __iomem base, u32 reg,
	size_t size)
	{
	int ret;
	u32 val;

	if (pci->ops->read_dbi)
	return pci->ops->read_dbi(pci, base, reg, size);

	ret = dw_pcie_read(base + reg, size, &val);
	if (ret)
	dev_err(pci->dev, "read DBI address failed\n");

	return val;
	}

	void __dw_pcie_write_dbi(struct dw_pcie pci, void __iomem base, u32 reg,
	size_t size, u32 val)
	{
	int ret;

	if (pci->ops->write_dbi) {
	pci->ops->write_dbi(pci, base, reg, size, val);
	return;
	}

	ret = dw_pcie_write(base + reg, size, val);
	if (ret)
	dev_err(pci->dev, "write DBI address failed\n");
	}

	static u32 dw_pcie_readl_ob_unroll(struct dw_pcie *pci, u32 index, u32 reg)
	{
	u32 offset = PCIE_GET_ATU_OUTB_UNR_REG_OFFSET(index);

	return dw_pcie_readl_dbi(pci, offset + reg);
	}

	static void dw_pcie_writel_ob_unroll(struct dw_pcie *pci, u32 index, u32 reg,
	u32 val)
	{
	u32 offset = PCIE_GET_ATU_OUTB_UNR_REG_OFFSET(index);

	dw_pcie_writel_dbi(pci, offset + reg, val);
	}

	static void dw_pcie_prog_outbound_atu_unroll(struct dw_pcie *pci, int index,
	int type, u64 cpu_addr,
	u64 pci_addr, u32 size)
	{
	u32 retries, val;

	dw_pcie_writel_ob_unroll(pci, index, PCIE_ATU_UNR_LOWER_BASE,
	lower_32_bits(cpu_addr));
	dw_pcie_writel_ob_unroll(pci, index, PCIE_ATU_UNR_UPPER_BASE,
	upper_32_bits(cpu_addr));
	dw_pcie_writel_ob_unroll(pci, index, PCIE_ATU_UNR_LIMIT,
	lower_32_bits(cpu_addr + size - 1));
	dw_pcie_writel_ob_unroll(pci, index, PCIE_ATU_UNR_LOWER_TARGET,
	lower_32_bits(pci_addr));
	dw_pcie_writel_ob_unroll(pci, index, PCIE_ATU_UNR_UPPER_TARGET,
	upper_32_bits(pci_addr));
	dw_pcie_writel_ob_unroll(pci, index, PCIE_ATU_UNR_REGION_CTRL1,
	type);
	dw_pcie_writel_ob_unroll(pci, index, PCIE_ATU_UNR_REGION_CTRL2,
	PCIE_ATU_ENABLE);

	/*
	* Make sure ATU enable takes effect before any subsequent config
	* and I/O accesses.
	*/
	for (retries = 0; retries < LINK_WAIT_MAX_IATU_RETRIES; retries++) {
	val = dw_pcie_readl_ob_unroll(pci, index,
	PCIE_ATU_UNR_REGION_CTRL2);
	if (val & PCIE_ATU_ENABLE)
	return;

	usleep_range(LINK_WAIT_IATU_MIN, LINK_WAIT_IATU_MAX);
	}
	dev_err(pci->dev, "outbound iATU is not being enabled\n");
	}

	void dw_pcie_prog_outbound_atu(struct dw_pcie *pci, int index, int type,
	u64 cpu_addr, u64 pci_addr, u32 size)
	{
	u32 retries, val;

	if (pci->ops->cpu_addr_fixup)
	cpu_addr = pci->ops->cpu_addr_fixup(cpu_addr);

	if (pci->iatu_unroll_enabled) {
	dw_pcie_prog_outbound_atu_unroll(pci, index, type, cpu_addr,
	pci_addr, size);
	return;
	}

	dw_pcie_writel_dbi(pci, PCIE_ATU_VIEWPORT,
	PCIE_ATU_REGION_OUTBOUND \| index);
	dw_pcie_writel_dbi(pci, PCIE_ATU_LOWER_BASE,
	lower_32_bits(cpu_addr));
	dw_pcie_writel_dbi(pci, PCIE_ATU_UPPER_BASE,
	upper_32_bits(cpu_addr));
	dw_pcie_writel_dbi(pci, PCIE_ATU_LIMIT,
	lower_32_bits(cpu_addr + size - 1));
	dw_pcie_writel_dbi(pci, PCIE_ATU_LOWER_TARGET,
	lower_32_bits(pci_addr));
	dw_pcie_writel_dbi(pci, PCIE_ATU_UPPER_TARGET,
	upper_32_bits(pci_addr));
	dw_pcie_writel_dbi(pci, PCIE_ATU_CR1, type);
	dw_pcie_writel_dbi(pci, PCIE_ATU_CR2, PCIE_ATU_ENABLE);

	/*
	* Make sure ATU enable takes effect before any subsequent config
	* and I/O accesses.
	*/
	for (retries = 0; retries < LINK_WAIT_MAX_IATU_RETRIES; retries++) {
	val = dw_pcie_readl_dbi(pci, PCIE_ATU_CR2);
	if (val & PCIE_ATU_ENABLE)
	return;

	usleep_range(LINK_WAIT_IATU_MIN, LINK_WAIT_IATU_MAX);
	}
	dev_err(pci->dev, "outbound iATU is not being enabled\n");
	}

	static u32 dw_pcie_readl_ib_unroll(struct dw_pcie *pci, u32 index, u32 reg)
	{
	u32 offset = PCIE_GET_ATU_INB_UNR_REG_OFFSET(index);

	return dw_pcie_readl_dbi(pci, offset + reg);
	}

	static void dw_pcie_writel_ib_unroll(struct dw_pcie *pci, u32 index, u32 reg,
	u32 val)
	{
	u32 offset = PCIE_GET_ATU_INB_UNR_REG_OFFSET(index);

	dw_pcie_writel_dbi(pci, offset + reg, val);
	}

	static int dw_pcie_prog_inbound_atu_unroll(struct dw_pcie *pci, int index,
	int bar, u64 cpu_addr,
	enum dw_pcie_as_type as_type)
	{
	int type;
	u32 retries, val;

	dw_pcie_writel_ib_unroll(pci, index, PCIE_ATU_UNR_LOWER_TARGET,
	lower_32_bits(cpu_addr));
	dw_pcie_writel_ib_unroll(pci, index, PCIE_ATU_UNR_UPPER_TARGET,
	upper_32_bits(cpu_addr));

	switch (as_type) {
	case DW_PCIE_AS_MEM:
	type = PCIE_ATU_TYPE_MEM;
	break;
	case DW_PCIE_AS_IO:
	type = PCIE_ATU_TYPE_IO;
	break;
	default:
	return -EINVAL;
	}

	dw_pcie_writel_ib_unroll(pci, index, PCIE_ATU_UNR_REGION_CTRL1, type);
	dw_pcie_writel_ib_unroll(pci, index, PCIE_ATU_UNR_REGION_CTRL2,
	PCIE_ATU_ENABLE \|
	PCIE_ATU_BAR_MODE_ENABLE \| (bar << 8));

	/*
	* Make sure ATU enable takes effect before any subsequent config
	* and I/O accesses.
	*/
	for (retries = 0; retries < LINK_WAIT_MAX_IATU_RETRIES; retries++) {
	val = dw_pcie_readl_ib_unroll(pci, index,
	PCIE_ATU_UNR_REGION_CTRL2);
	if (val & PCIE_ATU_ENABLE)
	return 0;

	usleep_range(LINK_WAIT_IATU_MIN, LINK_WAIT_IATU_MAX);
	}
	dev_err(pci->dev, "inbound iATU is not being enabled\n");

	return -EBUSY;
	}

	int dw_pcie_prog_inbound_atu(struct dw_pcie *pci, int index, int bar,
	u64 cpu_addr, enum dw_pcie_as_type as_type)
	{
	int type;
	u32 retries, val;

	if (pci->iatu_unroll_enabled)
	return dw_pcie_prog_inbound_atu_unroll(pci, index, bar,
	cpu_addr, as_type);

	dw_pcie_writel_dbi(pci, PCIE_ATU_VIEWPORT, PCIE_ATU_REGION_INBOUND \|
	index);
	dw_pcie_writel_dbi(pci, PCIE_ATU_LOWER_TARGET, lower_32_bits(cpu_addr));
	dw_pcie_writel_dbi(pci, PCIE_ATU_UPPER_TARGET, upper_32_bits(cpu_addr));

	switch (as_type) {
	case DW_PCIE_AS_MEM:
	type = PCIE_ATU_TYPE_MEM;
	break;
	case DW_PCIE_AS_IO:
	type = PCIE_ATU_TYPE_IO;
	break;
	default:
	return -EINVAL;
	}

	dw_pcie_writel_dbi(pci, PCIE_ATU_CR1, type);
	dw_pcie_writel_dbi(pci, PCIE_ATU_CR2, PCIE_ATU_ENABLE
	\| PCIE_ATU_BAR_MODE_ENABLE \| (bar << 8));

	/*
	* Make sure ATU enable takes effect before any subsequent config
	* and I/O accesses.
	*/
	for (retries = 0; retries < LINK_WAIT_MAX_IATU_RETRIES; retries++) {
	val = dw_pcie_readl_dbi(pci, PCIE_ATU_CR2);
	if (val & PCIE_ATU_ENABLE)
	return 0;

	usleep_range(LINK_WAIT_IATU_MIN, LINK_WAIT_IATU_MAX);
	}
	dev_err(pci->dev, "inbound iATU is not being enabled\n");

	return -EBUSY;
	}

	void dw_pcie_disable_atu(struct dw_pcie *pci, int index,
	enum dw_pcie_region_type type)
	{
	int region;

	switch (type) {
	case DW_PCIE_REGION_INBOUND:
	region = PCIE_ATU_REGION_INBOUND;
	break;
	case DW_PCIE_REGION_OUTBOUND:
	region = PCIE_ATU_REGION_OUTBOUND;
	break;
	default:
	return;
	}

	dw_pcie_writel_dbi(pci, PCIE_ATU_VIEWPORT, region \| index);
	dw_pcie_writel_dbi(pci, PCIE_ATU_CR2, ~PCIE_ATU_ENABLE);
	}

	int dw_pcie_wait_for_link(struct dw_pcie *pci)
	{
	int retries;

	/* check if the link is up or not */
	for (retries = 0; retries < LINK_WAIT_MAX_RETRIES; retries++) {
	if (dw_pcie_link_up(pci)) {
	dev_info(pci->dev, "link up\n");
	return 0;
	}
	usleep_range(LINK_WAIT_USLEEP_MIN, LINK_WAIT_USLEEP_MAX);
	}

	dev_err(pci->dev, "phy link never came up\n");

	return -ETIMEDOUT;
	}

	int dw_pcie_link_up(struct dw_pcie *pci)
	{
	u32 val;

	if (pci->ops->link_up)
	return pci->ops->link_up(pci);

	val = readl(pci->dbi_base + PCIE_PHY_DEBUG_R1);
	return ((val & PCIE_PHY_DEBUG_R1_LINK_UP) &&
	(!(val & PCIE_PHY_DEBUG_R1_LINK_IN_TRAINING)));
	}

	void dw_pcie_setup(struct dw_pcie *pci)
	{
	int ret;
	u32 val;
	u32 lanes;
	struct device *dev = pci->dev;
	struct device_node *np = dev->of_node;

	ret = of_property_read_u32(np, "num-lanes", &lanes);
	if (ret)
	lanes = 0;

	/* set the number of lanes */
	val = dw_pcie_readl_dbi(pci, PCIE_PORT_LINK_CONTROL);
	val &= ~PORT_LINK_MODE_MASK;
	switch (lanes) {
	case 1:
	val \|= PORT_LINK_MODE_1_LANES;
	break;
	case 2:
	val \|= PORT_LINK_MODE_2_LANES;
	break;
	case 4:
	val \|= PORT_LINK_MODE_4_LANES;
	break;
	case 8:
	val \|= PORT_LINK_MODE_8_LANES;
	break;
	default:
	dev_err(pci->dev, "num-lanes %u: invalid value\n", lanes);
	return;
	}
	dw_pcie_writel_dbi(pci, PCIE_PORT_LINK_CONTROL, val);

	/* set link width speed control register */
	val = dw_pcie_readl_dbi(pci, PCIE_LINK_WIDTH_SPEED_CONTROL);
	val &= ~PORT_LOGIC_LINK_WIDTH_MASK;
	switch (lanes) {
	case 1:
	val \|= PORT_LOGIC_LINK_WIDTH_1_LANES;
	break;
	case 2:
	val \|= PORT_LOGIC_LINK_WIDTH_2_LANES;
	break;
	case 4:
	val \|= PORT_LOGIC_LINK_WIDTH_4_LANES;
	break;
	case 8:
	val \|= PORT_LOGIC_LINK_WIDTH_8_LANES;
	break;
	}
	dw_pcie_writel_dbi(pci, PCIE_LINK_WIDTH_SPEED_CONTROL, val);
	}