[V2] pci: exynos: split into two parts such as Synopsys part and Exynos part

Commit Message

Jingoo Han July 11, 2013, 5:49 a.m. UTC

Exynos PCIe IP consists of Synopsys specific part and Exynos
specific part. Only core block is a Synopsys designware part;
other parts are Exynos specific.
Also, the Synopsys designware part can be shared with other
platforms; thus, it can be split two parts such as Synopsys
designware part and Exynos specific part.

Signed-off-by: Jingoo Han <[e-mail]>
Cc: Pratyush Anand <[e-mail]>
Cc: Mohit KUMAR <[e-mail]>
---
Changes since v1:
- moved the configuration, I/O, memory space handling to dw_pcie_host_init()
- removed exynos_pcie_abort()
- replaced 'purple_base' with 'block_base'
- replaced 'dbi_base' with 'dbi_addr'

 drivers/pci/host/Makefile          |    1 +
 drivers/pci/host/pcie-designware.c |  963 +++++++++---------------------------
 drivers/pci/host/pcie-designware.h |   71 +++
 drivers/pci/host/pcie-exynos.c     |  523 ++++++++++++++++++++
 4 files changed, 822 insertions(+), 736 deletions(-)
 create mode 100644 drivers/pci/host/pcie-designware.h
 create mode 100644 drivers/pci/host/pcie-exynos.c

Comments

Kishon Vijay Abraham I July 11, 2013, 6:40 a.m. UTC | #1

Hi Jingoo,

On Thursday 11 July 2013 11:19 AM, Jingoo Han wrote:
> Exynos PCIe IP consists of Synopsys specific part and Exynos
> specific part. Only core block is a Synopsys designware part;
> other parts are Exynos specific.
> Also, the Synopsys designware part can be shared with other
> platforms; thus, it can be split two parts such as Synopsys
> designware part and Exynos specific part.
> 
> Signed-off-by: Jingoo Han <[e-mail]>
> Cc: Pratyush Anand <[e-mail]>
> Cc: Mohit KUMAR <[e-mail]>
> ---
> Changes since v1:
> - moved the configuration, I/O, memory space handling to dw_pcie_host_init()
> - removed exynos_pcie_abort()
> - replaced 'purple_base' with 'block_base'
> - replaced 'dbi_base' with 'dbi_addr'
> 
>  drivers/pci/host/Makefile          |    1 +
>  drivers/pci/host/pcie-designware.c |  963 +++++++++---------------------------
>  drivers/pci/host/pcie-designware.h |   71 +++
>  drivers/pci/host/pcie-exynos.c     |  523 ++++++++++++++++++++
>  4 files changed, 822 insertions(+), 736 deletions(-)
>  create mode 100644 drivers/pci/host/pcie-designware.h
>  create mode 100644 drivers/pci/host/pcie-exynos.c
> 
> diff --git a/drivers/pci/host/Makefile b/drivers/pci/host/Makefile
> index 086d850..7e59864 100644
> --- a/drivers/pci/host/Makefile
> +++ b/drivers/pci/host/Makefile
> @@ -1,2 +1,3 @@
>  obj-$(CONFIG_PCI_MVEBU) += pci-mvebu.o
>  obj-$(CONFIG_PCIE_DW) += pcie-designware.o
> +obj-$(CONFIG_PCI_EXYNOS) += pcie-exynos.o
> diff --git a/drivers/pci/host/pcie-designware.c b/drivers/pci/host/pcie-designware.c
> index 26bdbda..b372ead 100644
> --- a/drivers/pci/host/pcie-designware.c
> +++ b/drivers/pci/host/pcie-designware.c
> @@ -1,5 +1,5 @@
>  /*
> - * PCIe host controller driver for Samsung EXYNOS SoCs
> + * Synopsys Designware PCIe host controller driver
>   *
>   * Copyright (C) 2013 Samsung Electronics Co., Ltd.
>   *		http://www.samsung.com
> @@ -11,64 +11,14 @@
>   * published by the Free Software Foundation.
>   */
>  
> -#include <linux/clk.h>
> -#include <linux/delay.h>
> -#include <linux/gpio.h>
> -#include <linux/interrupt.h>
>  #include <linux/kernel.h>
> -#include <linux/list.h>
>  #include <linux/module.h>
> -#include <linux/of.h>
>  #include <linux/of_address.h>
> -#include <linux/of_gpio.h>
> -#include <linux/of_pci.h>
>  #include <linux/pci.h>
>  #include <linux/pci_regs.h>
> -#include <linux/platform_device.h>
> -#include <linux/resource.h>
> -#include <linux/signal.h>
> -#include <linux/slab.h>
>  #include <linux/types.h>
>  
> -struct pcie_port_info {
> -	u32		cfg0_size;
> -	u32		cfg1_size;
> -	u32		io_size;
> -	u32		mem_size;
> -	phys_addr_t	io_bus_addr;
> -	phys_addr_t	mem_bus_addr;
> -};
> -
> -struct pcie_port {
> -	struct device		*dev;
> -	u8			controller;
> -	u8			root_bus_nr;
> -	void __iomem		*dbi_base;
> -	void __iomem		*elbi_base;
> -	void __iomem		*phy_base;
> -	void __iomem		*purple_base;
> -	u64			cfg0_base;
> -	void __iomem		*va_cfg0_base;
> -	u64			cfg1_base;
> -	void __iomem		*va_cfg1_base;
> -	u64			io_base;
> -	u64			mem_base;
> -	spinlock_t		conf_lock;
> -	struct resource		cfg;
> -	struct resource		io;
> -	struct resource		mem;
> -	struct pcie_port_info	config;
> -	struct clk		*clk;
> -	struct clk		*bus_clk;
> -	int			irq;
> -	int			reset_gpio;
> -};
> -
> -/*
> - * Exynos PCIe IP consists of Synopsys specific part and Exynos
> - * specific part. Only core block is a Synopsys designware part;
> - * other parts are Exynos specific.
> - */
> +#include "pcie-designware.h"
>  
>  /* Synopsis specific PCIE configuration registers */
>  #define PCIE_PORT_LINK_CONTROL		0x710
> @@ -108,69 +58,14 @@ struct pcie_port {
>  #define PCIE_ATU_FUNC(x)		(((x) & 0x7) << 16)
>  #define PCIE_ATU_UPPER_TARGET		0x91C
>  
> -/* Exynos specific PCIE configuration registers */
> -
> -/* PCIe ELBI registers */
> -#define PCIE_IRQ_PULSE			0x000
> -#define IRQ_INTA_ASSERT			(0x1 << 0)
> -#define IRQ_INTB_ASSERT			(0x1 << 2)
> -#define IRQ_INTC_ASSERT			(0x1 << 4)
> -#define IRQ_INTD_ASSERT			(0x1 << 6)
> -#define PCIE_IRQ_LEVEL			0x004
> -#define PCIE_IRQ_SPECIAL		0x008
> -#define PCIE_IRQ_EN_PULSE		0x00c
> -#define PCIE_IRQ_EN_LEVEL		0x010
> -#define PCIE_IRQ_EN_SPECIAL		0x014
> -#define PCIE_PWR_RESET			0x018
> -#define PCIE_CORE_RESET			0x01c
> -#define PCIE_CORE_RESET_ENABLE		(0x1 << 0)
> -#define PCIE_STICKY_RESET		0x020
> -#define PCIE_NONSTICKY_RESET		0x024
> -#define PCIE_APP_INIT_RESET		0x028
> -#define PCIE_APP_LTSSM_ENABLE		0x02c
> -#define PCIE_ELBI_RDLH_LINKUP		0x064
> -#define PCIE_ELBI_LTSSM_ENABLE		0x1
> -#define PCIE_ELBI_SLV_AWMISC		0x11c
> -#define PCIE_ELBI_SLV_ARMISC		0x120
> -#define PCIE_ELBI_SLV_DBI_ENABLE	(0x1 << 21)
> -
> -/* PCIe Purple registers */
> -#define PCIE_PHY_GLOBAL_RESET		0x000
> -#define PCIE_PHY_COMMON_RESET		0x004
> -#define PCIE_PHY_CMN_REG		0x008
> -#define PCIE_PHY_MAC_RESET		0x00c
> -#define PCIE_PHY_PLL_LOCKED		0x010
> -#define PCIE_PHY_TRSVREG_RESET		0x020
> -#define PCIE_PHY_TRSV_RESET		0x024
> -
> -/* PCIe PHY registers */
> -#define PCIE_PHY_IMPEDANCE		0x004
> -#define PCIE_PHY_PLL_DIV_0		0x008
> -#define PCIE_PHY_PLL_BIAS		0x00c
> -#define PCIE_PHY_DCC_FEEDBACK		0x014
> -#define PCIE_PHY_PLL_DIV_1		0x05c
> -#define PCIE_PHY_TRSV0_EMP_LVL		0x084
> -#define PCIE_PHY_TRSV0_DRV_LVL		0x088
> -#define PCIE_PHY_TRSV0_RXCDR		0x0ac
> -#define PCIE_PHY_TRSV0_LVCC		0x0dc
> -#define PCIE_PHY_TRSV1_EMP_LVL		0x144
> -#define PCIE_PHY_TRSV1_RXCDR		0x16c
> -#define PCIE_PHY_TRSV1_LVCC		0x19c
> -#define PCIE_PHY_TRSV2_EMP_LVL		0x204
> -#define PCIE_PHY_TRSV2_RXCDR		0x22c
> -#define PCIE_PHY_TRSV2_LVCC		0x25c
> -#define PCIE_PHY_TRSV3_EMP_LVL		0x2c4
> -#define PCIE_PHY_TRSV3_RXCDR		0x2ec
> -#define PCIE_PHY_TRSV3_LVCC		0x31c
> -
> -static struct hw_pci exynos_pci;
> +unsigned long global_io_offset;
>  
>  static inline struct pcie_port *sys_to_pcie(struct pci_sys_data *sys)
>  {
>  	return sys->private_data;
>  }
>  
> -static inline int cfg_read(void *addr, int where, int size, u32 *val)
> +int cfg_read(void *addr, int where, int size, u32 *val)
>  {
>  	*val = readl(addr);
>  
> @@ -184,7 +79,7 @@ static inline int cfg_read(void *addr, int where, int size, u32 *val)
>  	return PCIBIOS_SUCCESSFUL;
>  }
>  
> -static inline int cfg_write(void *addr, int where, int size, u32 val)
> +int cfg_write(void *addr, int where, int size, u32 val)
>  {
>  	if (size == 4)
>  		writel(val, addr);
> @@ -198,155 +93,225 @@ static inline int cfg_write(void *addr, int where, int size, u32 val)
>  	return PCIBIOS_SUCCESSFUL;
>  }
>  
> -static void exynos_pcie_sideband_dbi_w_mode(struct pcie_port *pp, bool on)
> -{
> -	u32 val;
> -
> -	if (on) {
> -		val = readl(pp->elbi_base + PCIE_ELBI_SLV_AWMISC);
> -		val |= PCIE_ELBI_SLV_DBI_ENABLE;
> -		writel(val, pp->elbi_base + PCIE_ELBI_SLV_AWMISC);
> -	} else {
> -		val = readl(pp->elbi_base + PCIE_ELBI_SLV_AWMISC);
> -		val &= ~PCIE_ELBI_SLV_DBI_ENABLE;
> -		writel(val, pp->elbi_base + PCIE_ELBI_SLV_AWMISC);
> -	}
> -}
> -
> -static void exynos_pcie_sideband_dbi_r_mode(struct pcie_port *pp, bool on)
> +static inline void dw_pcie_readl_rc(struct pcie_port *pp,
> +				void __iomem *dbi_addr, u32 *val)
>  {
> -	u32 val;
> -
> -	if (on) {
> -		val = readl(pp->elbi_base + PCIE_ELBI_SLV_ARMISC);
> -		val |= PCIE_ELBI_SLV_DBI_ENABLE;
> -		writel(val, pp->elbi_base + PCIE_ELBI_SLV_ARMISC);
> -	} else {
> -		val = readl(pp->elbi_base + PCIE_ELBI_SLV_ARMISC);
> -		val &= ~PCIE_ELBI_SLV_DBI_ENABLE;
> -		writel(val, pp->elbi_base + PCIE_ELBI_SLV_ARMISC);
> -	}
> -}
> -
> -static inline void readl_rc(struct pcie_port *pp, void *dbi_base, u32 *val)
> -{
> -	exynos_pcie_sideband_dbi_r_mode(pp, true);
> -	*val = readl(dbi_base);
> -	exynos_pcie_sideband_dbi_r_mode(pp, false);
> -	return;
> +	if (pp->ops->readl_rc)
> +		pp->ops->readl_rc(pp, dbi_addr, val);
> +	else
> +		*val = readl(dbi_addr);
>  }
>  
> -static inline void writel_rc(struct pcie_port *pp, u32 val, void *dbi_base)
> +static inline void dw_pcie_writel_rc(struct pcie_port *pp,
> +				u32 val, void __iomem *dbi_addr)
>  {
> -	exynos_pcie_sideband_dbi_w_mode(pp, true);
> -	writel(val, dbi_base);
> -	exynos_pcie_sideband_dbi_w_mode(pp, false);
> -	return;
> +	if (pp->ops->writel_rc)
> +		pp->ops->writel_rc(pp, val, dbi_addr);
> +	else
> +		writel(val, dbi_addr);
>  }
>  
> -static int exynos_pcie_rd_own_conf(struct pcie_port *pp, int where, int size,
> +int dw_pcie_rd_own_conf(struct pcie_port *pp, int where, int size,
>  				u32 *val)
>  {
>  	int ret;
>  
> -	exynos_pcie_sideband_dbi_r_mode(pp, true);
> -	ret = cfg_read(pp->dbi_base + (where & ~0x3), where, size, val);
> -	exynos_pcie_sideband_dbi_r_mode(pp, false);
> +	if (pp->ops->rd_own_conf)
> +		ret = pp->ops->rd_own_conf(pp, where, size, val);
> +	else
> +		ret = cfg_read(pp->dbi_base + (where & ~0x3), where, size, val);
> +
>  	return ret;
>  }
>  
> -static int exynos_pcie_wr_own_conf(struct pcie_port *pp, int where, int size,
> +int dw_pcie_wr_own_conf(struct pcie_port *pp, int where, int size,
>  				u32 val)
>  {
>  	int ret;
>  
> -	exynos_pcie_sideband_dbi_w_mode(pp, true);
> -	ret = cfg_write(pp->dbi_base + (where & ~0x3), where, size, val);
> -	exynos_pcie_sideband_dbi_w_mode(pp, false);
> +	if (pp->ops->wr_own_conf)
> +		ret = pp->ops->wr_own_conf(pp, where, size, val);
> +	else
> +		ret = cfg_write(pp->dbi_base + (where & ~0x3), where, size,
> +				val);
> +
>  	return ret;
>  }
>  
> -static void exynos_pcie_prog_viewport_cfg0(struct pcie_port *pp, u32 busdev)
> +int dw_pcie_link_up(struct pcie_port *pp)
> +{
> +	if (pp->ops->link_up)
> +		return pp->ops->link_up(pp);
> +	else
> +		return 0;
> +}
> +
> +int dw_pcie_host_init(struct pcie_port *pp)
> +{
> +	struct device_node *np = pp->dev->of_node;
> +	struct of_pci_range range;
> +	struct of_pci_range_parser parser;
> +	u32 val;
> +
> +	if (of_pci_range_parser_init(&parser, np)) {
> +		dev_err(pp->dev, "missing ranges property\n");
> +		return -EINVAL;
> +	}
> +
> +	/* Get the I/O and memory ranges from DT */
> +	for_each_of_pci_range(&parser, &range) {
> +		unsigned long restype = range.flags & IORESOURCE_TYPE_BITS;
> +		if (restype == IORESOURCE_IO) {
> +			of_pci_range_to_resource(&range, np, &pp->io);
> +			pp->io.name = "I/O";
> +			pp->io.start = max_t(resource_size_t,
> +					     PCIBIOS_MIN_IO,
> +					     range.pci_addr + global_io_offset);
> +			pp->io.end = min_t(resource_size_t,
> +					   IO_SPACE_LIMIT,
> +					   range.pci_addr + range.size
> +					   + global_io_offset);
> +			pp->config.io_size = resource_size(&pp->io);
> +			pp->config.io_bus_addr = range.pci_addr;
> +		}
> +		if (restype == IORESOURCE_MEM) {
> +			of_pci_range_to_resource(&range, np, &pp->mem);
> +			pp->mem.name = "MEM";
> +			pp->config.mem_size = resource_size(&pp->mem);
> +			pp->config.mem_bus_addr = range.pci_addr;
> +		}
> +		if (restype == 0) {
> +			of_pci_range_to_resource(&range, np, &pp->cfg);
> +			pp->config.cfg0_size = resource_size(&pp->cfg)/2;
> +			pp->config.cfg1_size = resource_size(&pp->cfg)/2;
> +		}
> +	}
> +
> +	pp->dbi_base = devm_ioremap(pp->dev, pp->cfg.start,
> +				resource_size(&pp->cfg));
> +	if (!pp->dbi_base) {
> +		dev_err(pp->dev, "error with ioremap\n");
> +		return -ENOMEM;
> +	}
> +
> +	pp->cfg0_base = pp->cfg.start;
> +	pp->cfg1_base = pp->cfg.start + pp->config.cfg0_size;
> +	pp->io_base = pp->io.start;
> +	pp->mem_base = pp->mem.start;
> +
> +	pp->va_cfg0_base = devm_ioremap(pp->dev, pp->cfg0_base,
> +					pp->config.cfg0_size);
> +	if (!pp->va_cfg0_base) {
> +		dev_err(pp->dev, "error with ioremap in function\n");
> +		return -ENOMEM;
> +	}
> +	pp->va_cfg1_base = devm_ioremap(pp->dev, pp->cfg1_base,
> +					pp->config.cfg1_size);
> +	if (!pp->va_cfg1_base) {
> +		dev_err(pp->dev, "error with ioremap\n");
> +		return -ENOMEM;
> +	}
> +
> +	if (pp->ops->host_init)
> +		pp->ops->host_init(pp);
> +
> +	dw_pcie_wr_own_conf(pp, PCI_BASE_ADDRESS_0, 4, 0);
> +
> +	/* program correct class for RC */
> +	dw_pcie_wr_own_conf(pp, PCI_CLASS_DEVICE, 2, PCI_CLASS_BRIDGE_PCI);
> +
> +	dw_pcie_rd_own_conf(pp, PCIE_LINK_WIDTH_SPEED_CONTROL, 4, &val);
> +	val |= PORT_LOGIC_SPEED_CHANGE;
> +	dw_pcie_wr_own_conf(pp, PCIE_LINK_WIDTH_SPEED_CONTROL, 4, val);
> +
> +	return 0;
> +}
> +
> +static void dw_pcie_prog_viewport_cfg0(struct pcie_port *pp, u32 busdev)
>  {
>  	u32 val;
>  	void __iomem *dbi_base = pp->dbi_base;
>  
>  	/* Program viewport 0 : OUTBOUND : CFG0 */
>  	val = PCIE_ATU_REGION_OUTBOUND | PCIE_ATU_REGION_INDEX0;
> -	writel_rc(pp, val, dbi_base + PCIE_ATU_VIEWPORT);
> -	writel_rc(pp, pp->cfg0_base, dbi_base + PCIE_ATU_LOWER_BASE);
> -	writel_rc(pp, (pp->cfg0_base >> 32), dbi_base + PCIE_ATU_UPPER_BASE);
> -	writel_rc(pp, pp->cfg0_base + pp->config.cfg0_size - 1,
> +	dw_pcie_writel_rc(pp, val, dbi_base + PCIE_ATU_VIEWPORT);
> +	dw_pcie_writel_rc(pp, pp->cfg0_base, dbi_base + PCIE_ATU_LOWER_BASE);
> +	dw_pcie_writel_rc(pp, (pp->cfg0_base >> 32),
> +			dbi_base + PCIE_ATU_UPPER_BASE);
> +	dw_pcie_writel_rc(pp, pp->cfg0_base + pp->config.cfg0_size - 1,
>  			dbi_base + PCIE_ATU_LIMIT);
> -	writel_rc(pp, busdev, dbi_base + PCIE_ATU_LOWER_TARGET);
> -	writel_rc(pp, 0, dbi_base + PCIE_ATU_UPPER_TARGET);
> -	writel_rc(pp, PCIE_ATU_TYPE_CFG0, dbi_base + PCIE_ATU_CR1);
> +	dw_pcie_writel_rc(pp, busdev, dbi_base + PCIE_ATU_LOWER_TARGET);
> +	dw_pcie_writel_rc(pp, 0, dbi_base + PCIE_ATU_UPPER_TARGET);
> +	dw_pcie_writel_rc(pp, PCIE_ATU_TYPE_CFG0, dbi_base + PCIE_ATU_CR1);
>  	val = PCIE_ATU_ENABLE;
> -	writel_rc(pp, val, dbi_base + PCIE_ATU_CR2);
> +	dw_pcie_writel_rc(pp, val, dbi_base + PCIE_ATU_CR2);
>  }
>  
> -static void exynos_pcie_prog_viewport_cfg1(struct pcie_port *pp, u32 busdev)
> +static void dw_pcie_prog_viewport_cfg1(struct pcie_port *pp, u32 busdev)
>  {
>  	u32 val;
>  	void __iomem *dbi_base = pp->dbi_base;
>  
>  	/* Program viewport 1 : OUTBOUND : CFG1 */
>  	val = PCIE_ATU_REGION_OUTBOUND | PCIE_ATU_REGION_INDEX1;
> -	writel_rc(pp, val, dbi_base + PCIE_ATU_VIEWPORT);
> -	writel_rc(pp, PCIE_ATU_TYPE_CFG1, dbi_base + PCIE_ATU_CR1);
> +	dw_pcie_writel_rc(pp, val, dbi_base + PCIE_ATU_VIEWPORT);
> +	dw_pcie_writel_rc(pp, PCIE_ATU_TYPE_CFG1, dbi_base + PCIE_ATU_CR1);
>  	val = PCIE_ATU_ENABLE;
> -	writel_rc(pp, val, dbi_base + PCIE_ATU_CR2);
> -	writel_rc(pp, pp->cfg1_base, dbi_base + PCIE_ATU_LOWER_BASE);
> -	writel_rc(pp, (pp->cfg1_base >> 32), dbi_base + PCIE_ATU_UPPER_BASE);
> -	writel_rc(pp, pp->cfg1_base + pp->config.cfg1_size - 1,
> +	dw_pcie_writel_rc(pp, val, dbi_base + PCIE_ATU_CR2);
> +	dw_pcie_writel_rc(pp, pp->cfg1_base, dbi_base + PCIE_ATU_LOWER_BASE);
> +	dw_pcie_writel_rc(pp, (pp->cfg1_base >> 32),
> +			dbi_base + PCIE_ATU_UPPER_BASE);
> +	dw_pcie_writel_rc(pp, pp->cfg1_base + pp->config.cfg1_size - 1,
>  			dbi_base + PCIE_ATU_LIMIT);
> -	writel_rc(pp, busdev, dbi_base + PCIE_ATU_LOWER_TARGET);
> -	writel_rc(pp, 0, dbi_base + PCIE_ATU_UPPER_TARGET);
> +	dw_pcie_writel_rc(pp, busdev, dbi_base + PCIE_ATU_LOWER_TARGET);
> +	dw_pcie_writel_rc(pp, 0, dbi_base + PCIE_ATU_UPPER_TARGET);
>  }
>  
> -static void exynos_pcie_prog_viewport_mem_outbound(struct pcie_port *pp)
> +static void dw_pcie_prog_viewport_mem_outbound(struct pcie_port *pp)
>  {
>  	u32 val;
>  	void __iomem *dbi_base = pp->dbi_base;
>  
>  	/* Program viewport 0 : OUTBOUND : MEM */
>  	val = PCIE_ATU_REGION_OUTBOUND | PCIE_ATU_REGION_INDEX0;
> -	writel_rc(pp, val, dbi_base + PCIE_ATU_VIEWPORT);
> -	writel_rc(pp, PCIE_ATU_TYPE_MEM, dbi_base + PCIE_ATU_CR1);
> +	dw_pcie_writel_rc(pp, val, dbi_base + PCIE_ATU_VIEWPORT);
> +	dw_pcie_writel_rc(pp, PCIE_ATU_TYPE_MEM, dbi_base + PCIE_ATU_CR1);
>  	val = PCIE_ATU_ENABLE;
> -	writel_rc(pp, val, dbi_base + PCIE_ATU_CR2);
> -	writel_rc(pp, pp->mem_base, dbi_base + PCIE_ATU_LOWER_BASE);
> -	writel_rc(pp, (pp->mem_base >> 32), dbi_base + PCIE_ATU_UPPER_BASE);
> -	writel_rc(pp, pp->mem_base + pp->config.mem_size - 1,
> +	dw_pcie_writel_rc(pp, val, dbi_base + PCIE_ATU_CR2);
> +	dw_pcie_writel_rc(pp, pp->mem_base, dbi_base + PCIE_ATU_LOWER_BASE);
> +	dw_pcie_writel_rc(pp, (pp->mem_base >> 32),
> +			dbi_base + PCIE_ATU_UPPER_BASE);
> +	dw_pcie_writel_rc(pp, pp->mem_base + pp->config.mem_size - 1,
>  			dbi_base + PCIE_ATU_LIMIT);
> -	writel_rc(pp, pp->config.mem_bus_addr,
> +	dw_pcie_writel_rc(pp, pp->config.mem_bus_addr,
>  			dbi_base + PCIE_ATU_LOWER_TARGET);
> -	writel_rc(pp, upper_32_bits(pp->config.mem_bus_addr),
> +	dw_pcie_writel_rc(pp, upper_32_bits(pp->config.mem_bus_addr),
>  			dbi_base + PCIE_ATU_UPPER_TARGET);
>  }
>  
> -static void exynos_pcie_prog_viewport_io_outbound(struct pcie_port *pp)
> +static void dw_pcie_prog_viewport_io_outbound(struct pcie_port *pp)
>  {
>  	u32 val;
>  	void __iomem *dbi_base = pp->dbi_base;
>  
>  	/* Program viewport 1 : OUTBOUND : IO */
>  	val = PCIE_ATU_REGION_OUTBOUND | PCIE_ATU_REGION_INDEX1;
> -	writel_rc(pp, val, dbi_base + PCIE_ATU_VIEWPORT);
> -	writel_rc(pp, PCIE_ATU_TYPE_IO, dbi_base + PCIE_ATU_CR1);
> +	dw_pcie_writel_rc(pp, val, dbi_base + PCIE_ATU_VIEWPORT);
> +	dw_pcie_writel_rc(pp, PCIE_ATU_TYPE_IO, dbi_base + PCIE_ATU_CR1);
>  	val = PCIE_ATU_ENABLE;
> -	writel_rc(pp, val, dbi_base + PCIE_ATU_CR2);
> -	writel_rc(pp, pp->io_base, dbi_base + PCIE_ATU_LOWER_BASE);
> -	writel_rc(pp, (pp->io_base >> 32), dbi_base + PCIE_ATU_UPPER_BASE);
> -	writel_rc(pp, pp->io_base + pp->config.io_size - 1,
> +	dw_pcie_writel_rc(pp, val, dbi_base + PCIE_ATU_CR2);
> +	dw_pcie_writel_rc(pp, pp->io_base, dbi_base + PCIE_ATU_LOWER_BASE);
> +	dw_pcie_writel_rc(pp, (pp->io_base >> 32),
> +			dbi_base + PCIE_ATU_UPPER_BASE);
> +	dw_pcie_writel_rc(pp, pp->io_base + pp->config.io_size - 1,
>  			dbi_base + PCIE_ATU_LIMIT);
> -	writel_rc(pp, pp->config.io_bus_addr,
> +	dw_pcie_writel_rc(pp, pp->config.io_bus_addr,
>  			dbi_base + PCIE_ATU_LOWER_TARGET);
> -	writel_rc(pp, upper_32_bits(pp->config.io_bus_addr),
> +	dw_pcie_writel_rc(pp, upper_32_bits(pp->config.io_bus_addr),
>  			dbi_base + PCIE_ATU_UPPER_TARGET);
>  }
>  
> -static int exynos_pcie_rd_other_conf(struct pcie_port *pp, struct pci_bus *bus,
> +static int dw_pcie_rd_other_conf(struct pcie_port *pp, struct pci_bus *bus,
>  		u32 devfn, int where, int size, u32 *val)
>  {
>  	int ret = PCIBIOS_SUCCESSFUL;
> @@ -357,19 +322,19 @@ static int exynos_pcie_rd_other_conf(struct pcie_port *pp, struct pci_bus *bus,
>  	address = where & ~0x3;
>  
>  	if (bus->parent->number == pp->root_bus_nr) {
> -		exynos_pcie_prog_viewport_cfg0(pp, busdev);
> +		dw_pcie_prog_viewport_cfg0(pp, busdev);
>  		ret = cfg_read(pp->va_cfg0_base + address, where, size, val);
> -		exynos_pcie_prog_viewport_mem_outbound(pp);
> +		dw_pcie_prog_viewport_mem_outbound(pp);
>  	} else {
> -		exynos_pcie_prog_viewport_cfg1(pp, busdev);
> +		dw_pcie_prog_viewport_cfg1(pp, busdev);
>  		ret = cfg_read(pp->va_cfg1_base + address, where, size, val);
> -		exynos_pcie_prog_viewport_io_outbound(pp);
> +		dw_pcie_prog_viewport_io_outbound(pp);
>  	}
>  
>  	return ret;
>  }
>  
> -static int exynos_pcie_wr_other_conf(struct pcie_port *pp, struct pci_bus *bus,
> +static int dw_pcie_wr_other_conf(struct pcie_port *pp, struct pci_bus *bus,
>  		u32 devfn, int where, int size, u32 val)
>  {
>  	int ret = PCIBIOS_SUCCESSFUL;
> @@ -380,59 +345,25 @@ static int exynos_pcie_wr_other_conf(struct pcie_port *pp, struct pci_bus *bus,
>  	address = where & ~0x3;
>  
>  	if (bus->parent->number == pp->root_bus_nr) {
> -		exynos_pcie_prog_viewport_cfg0(pp, busdev);
> +		dw_pcie_prog_viewport_cfg0(pp, busdev);
>  		ret = cfg_write(pp->va_cfg0_base + address, where, size, val);
> -		exynos_pcie_prog_viewport_mem_outbound(pp);
> +		dw_pcie_prog_viewport_mem_outbound(pp);
>  	} else {
> -		exynos_pcie_prog_viewport_cfg1(pp, busdev);
> +		dw_pcie_prog_viewport_cfg1(pp, busdev);
>  		ret = cfg_write(pp->va_cfg1_base + address, where, size, val);
> -		exynos_pcie_prog_viewport_io_outbound(pp);
> +		dw_pcie_prog_viewport_io_outbound(pp);
>  	}
>  
>  	return ret;
>  }
>  
> -static unsigned long global_io_offset;
> -
> -static int exynos_pcie_setup(int nr, struct pci_sys_data *sys)
> -{
> -	struct pcie_port *pp;
> -
> -	pp = sys_to_pcie(sys);
> -
> -	if (!pp)
> -		return 0;
> -
> -	if (global_io_offset < SZ_1M && pp->config.io_size > 0) {
> -		sys->io_offset = global_io_offset - pp->config.io_bus_addr;
> -		pci_ioremap_io(sys->io_offset, pp->io.start);
> -		global_io_offset += SZ_64K;
> -		pci_add_resource_offset(&sys->resources, &pp->io,
> -					sys->io_offset);
> -	}
> -
> -	sys->mem_offset = pp->mem.start - pp->config.mem_bus_addr;
> -	pci_add_resource_offset(&sys->resources, &pp->mem, sys->mem_offset);
> -
> -	return 1;
> -}
> -
> -static int exynos_pcie_link_up(struct pcie_port *pp)
> -{
> -	u32 val = readl(pp->elbi_base + PCIE_ELBI_RDLH_LINKUP);
> -
> -	if (val == PCIE_ELBI_LTSSM_ENABLE)
> -		return 1;
>  
> -	return 0;
> -}
> -
> -static int exynos_pcie_valid_config(struct pcie_port *pp,
> +static int dw_pcie_valid_config(struct pcie_port *pp,
>  				struct pci_bus *bus, int dev)
>  {
>  	/* If there is no link, then there is no device */
>  	if (bus->number != pp->root_bus_nr) {
> -		if (!exynos_pcie_link_up(pp))
> +		if (!dw_pcie_link_up(pp))
>  			return 0;
>  	}
>  
> @@ -450,7 +381,7 @@ static int exynos_pcie_valid_config(struct pcie_port *pp,
>  	return 1;
>  }
>  
> -static int exynos_pcie_rd_conf(struct pci_bus *bus, u32 devfn, int where,
> +static int dw_pcie_rd_conf(struct pci_bus *bus, u32 devfn, int where,
>  			int size, u32 *val)
>  {
>  	struct pcie_port *pp = sys_to_pcie(bus->sysdata);
> @@ -462,23 +393,23 @@ static int exynos_pcie_rd_conf(struct pci_bus *bus, u32 devfn, int where,
>  		return -EINVAL;
>  	}
>  
> -	if (exynos_pcie_valid_config(pp, bus, PCI_SLOT(devfn)) == 0) {
> +	if (dw_pcie_valid_config(pp, bus, PCI_SLOT(devfn)) == 0) {
>  		*val = 0xffffffff;
>  		return PCIBIOS_DEVICE_NOT_FOUND;
>  	}
>  
>  	spin_lock_irqsave(&pp->conf_lock, flags);
>  	if (bus->number != pp->root_bus_nr)
> -		ret = exynos_pcie_rd_other_conf(pp, bus, devfn,
> +		ret = dw_pcie_rd_other_conf(pp, bus, devfn,
>  						where, size, val);
>  	else
> -		ret = exynos_pcie_rd_own_conf(pp, where, size, val);
> +		ret = dw_pcie_rd_own_conf(pp, where, size, val);
>  	spin_unlock_irqrestore(&pp->conf_lock, flags);
>  
>  	return ret;
>  }
>  
> -static int exynos_pcie_wr_conf(struct pci_bus *bus, u32 devfn,
> +static int dw_pcie_wr_conf(struct pci_bus *bus, u32 devfn,
>  			int where, int size, u32 val)
>  {
>  	struct pcie_port *pp = sys_to_pcie(bus->sysdata);
> @@ -490,34 +421,56 @@ static int exynos_pcie_wr_conf(struct pci_bus *bus, u32 devfn,
>  		return -EINVAL;
>  	}
>  
> -	if (exynos_pcie_valid_config(pp, bus, PCI_SLOT(devfn)) == 0)
> +	if (dw_pcie_valid_config(pp, bus, PCI_SLOT(devfn)) == 0)
>  		return PCIBIOS_DEVICE_NOT_FOUND;
>  
>  	spin_lock_irqsave(&pp->conf_lock, flags);
>  	if (bus->number != pp->root_bus_nr)
> -		ret = exynos_pcie_wr_other_conf(pp, bus, devfn,
> +		ret = dw_pcie_wr_other_conf(pp, bus, devfn,
>  						where, size, val);
>  	else
> -		ret = exynos_pcie_wr_own_conf(pp, where, size, val);
> +		ret = dw_pcie_wr_own_conf(pp, where, size, val);
>  	spin_unlock_irqrestore(&pp->conf_lock, flags);
>  
>  	return ret;
>  }
>  
> -static struct pci_ops exynos_pcie_ops = {
> -	.read = exynos_pcie_rd_conf,
> -	.write = exynos_pcie_wr_conf,
> +static struct pci_ops dw_pcie_ops = {
> +	.read = dw_pcie_rd_conf,
> +	.write = dw_pcie_wr_conf,
>  };
>  
> -static struct pci_bus *exynos_pcie_scan_bus(int nr,
> -					struct pci_sys_data *sys)
> +int dw_pcie_setup(int nr, struct pci_sys_data *sys)
> +{
> +	struct pcie_port *pp;
> +
> +	pp = sys_to_pcie(sys);
> +
> +	if (!pp)
> +		return 0;
> +
> +	if (global_io_offset < SZ_1M && pp->config.io_size > 0) {
> +		sys->io_offset = global_io_offset - pp->config.io_bus_addr;
> +		pci_ioremap_io(sys->io_offset, pp->io.start);
> +		global_io_offset += SZ_64K;
> +		pci_add_resource_offset(&sys->resources, &pp->io,
> +					sys->io_offset);
> +	}
> +
> +	sys->mem_offset = pp->mem.start - pp->config.mem_bus_addr;
> +	pci_add_resource_offset(&sys->resources, &pp->mem, sys->mem_offset);
> +
> +	return 1;
> +}
> +
> +struct pci_bus *dw_pcie_scan_bus(int nr, struct pci_sys_data *sys)
>  {
>  	struct pci_bus *bus;
>  	struct pcie_port *pp = sys_to_pcie(sys);
>  
>  	if (pp) {
>  		pp->root_bus_nr = sys->busnr;
> -		bus = pci_scan_root_bus(NULL, sys->busnr, &exynos_pcie_ops,
> +		bus = pci_scan_root_bus(NULL, sys->busnr, &dw_pcie_ops,
>  					sys, &sys->resources);
>  	} else {
>  		bus = NULL;
> @@ -527,20 +480,20 @@ static struct pci_bus *exynos_pcie_scan_bus(int nr,
>  	return bus;
>  }
>  
> -static int exynos_pcie_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
> +int dw_pcie_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
>  {
>  	struct pcie_port *pp = sys_to_pcie(dev->bus->sysdata);
>  
>  	return pp->irq;
>  }
>  
> -static struct hw_pci exynos_pci = {
> -	.setup		= exynos_pcie_setup,
> -	.scan		= exynos_pcie_scan_bus,
> -	.map_irq	= exynos_pcie_map_irq,
> +struct hw_pci dw_pci = {
> +	.setup		= dw_pcie_setup,
> +	.scan		= dw_pcie_scan_bus,
> +	.map_irq	= dw_pcie_map_irq,
>  };
>  
> -static void exynos_pcie_setup_rc(struct pcie_port *pp)
> +void dw_pcie_setup_rc(struct pcie_port *pp)
>  {
>  	struct pcie_port_info *config = &pp->config;
>  	void __iomem *dbi_base = pp->dbi_base;
> @@ -549,509 +502,47 @@ static void exynos_pcie_setup_rc(struct pcie_port *pp)
>  	u32 memlimit;
>  
>  	/* set the number of lines as 4 */
> -	readl_rc(pp, dbi_base + PCIE_PORT_LINK_CONTROL, &val);
> +	dw_pcie_readl_rc(pp, dbi_base + PCIE_PORT_LINK_CONTROL, &val);
>  	val &= ~PORT_LINK_MODE_MASK;
>  	val |= PORT_LINK_MODE_4_LANES;
> -	writel_rc(pp, val, dbi_base + PCIE_PORT_LINK_CONTROL);
> +	dw_pcie_writel_rc(pp, val, dbi_base + PCIE_PORT_LINK_CONTROL);
>  
>  	/* set link width speed control register */
> -	readl_rc(pp, dbi_base + PCIE_LINK_WIDTH_SPEED_CONTROL, &val);
> +	dw_pcie_readl_rc(pp, dbi_base + PCIE_LINK_WIDTH_SPEED_CONTROL, &val);
>  	val &= ~PORT_LOGIC_LINK_WIDTH_MASK;
>  	val |= PORT_LOGIC_LINK_WIDTH_4_LANES;
> -	writel_rc(pp, val, dbi_base + PCIE_LINK_WIDTH_SPEED_CONTROL);
> +	dw_pcie_writel_rc(pp, val, dbi_base + PCIE_LINK_WIDTH_SPEED_CONTROL);
>  
>  	/* setup RC BARs */
> -	writel_rc(pp, 0x00000004, dbi_base + PCI_BASE_ADDRESS_0);
> -	writel_rc(pp, 0x00000004, dbi_base + PCI_BASE_ADDRESS_1);
> +	dw_pcie_writel_rc(pp, 0x00000004, dbi_base + PCI_BASE_ADDRESS_0);
> +	dw_pcie_writel_rc(pp, 0x00000004, dbi_base + PCI_BASE_ADDRESS_1);
>  
>  	/* setup interrupt pins */
> -	readl_rc(pp, dbi_base + PCI_INTERRUPT_LINE, &val);
> +	dw_pcie_readl_rc(pp, dbi_base + PCI_INTERRUPT_LINE, &val);
>  	val &= 0xffff00ff;
>  	val |= 0x00000100;
> -	writel_rc(pp, val, dbi_base + PCI_INTERRUPT_LINE);
> +	dw_pcie_writel_rc(pp, val, dbi_base + PCI_INTERRUPT_LINE);
>  
>  	/* setup bus numbers */
> -	readl_rc(pp, dbi_base + PCI_PRIMARY_BUS, &val);
> +	dw_pcie_readl_rc(pp, dbi_base + PCI_PRIMARY_BUS, &val);
>  	val &= 0xff000000;
>  	val |= 0x00010100;
> -	writel_rc(pp, val, dbi_base + PCI_PRIMARY_BUS);
> +	dw_pcie_writel_rc(pp, val, dbi_base + PCI_PRIMARY_BUS);
>  
>  	/* setup memory base, memory limit */
>  	membase = ((u32)pp->mem_base & 0xfff00000) >> 16;
>  	memlimit = (config->mem_size + (u32)pp->mem_base) & 0xfff00000;
>  	val = memlimit | membase;
> -	writel_rc(pp, val, dbi_base + PCI_MEMORY_BASE);
> +	dw_pcie_writel_rc(pp, val, dbi_base + PCI_MEMORY_BASE);
>  
>  	/* setup command register */
> -	readl_rc(pp, dbi_base + PCI_COMMAND, &val);
> +	dw_pcie_readl_rc(pp, dbi_base + PCI_COMMAND, &val);
>  	val &= 0xffff0000;
>  	val |= PCI_COMMAND_IO | PCI_COMMAND_MEMORY |
>  		PCI_COMMAND_MASTER | PCI_COMMAND_SERR;
> -	writel_rc(pp, val, dbi_base + PCI_COMMAND);
> -}
> -
> -static void exynos_pcie_assert_core_reset(struct pcie_port *pp)
> -{
> -	u32 val;
> -	void __iomem *elbi_base = pp->elbi_base;
> -
> -	val = readl(elbi_base + PCIE_CORE_RESET);
> -	val &= ~PCIE_CORE_RESET_ENABLE;
> -	writel(val, elbi_base + PCIE_CORE_RESET);
> -	writel(0, elbi_base + PCIE_PWR_RESET);
> -	writel(0, elbi_base + PCIE_STICKY_RESET);
> -	writel(0, elbi_base + PCIE_NONSTICKY_RESET);
> -}
> -
> -static void exynos_pcie_deassert_core_reset(struct pcie_port *pp)
> -{
> -	u32 val;
> -	void __iomem *elbi_base = pp->elbi_base;
> -	void __iomem *purple_base = pp->purple_base;
> -
> -	val = readl(elbi_base + PCIE_CORE_RESET);
> -	val |= PCIE_CORE_RESET_ENABLE;
> -	writel(val, elbi_base + PCIE_CORE_RESET);
> -	writel(1, elbi_base + PCIE_STICKY_RESET);
> -	writel(1, elbi_base + PCIE_NONSTICKY_RESET);
> -	writel(1, elbi_base + PCIE_APP_INIT_RESET);
> -	writel(0, elbi_base + PCIE_APP_INIT_RESET);
> -	writel(1, purple_base + PCIE_PHY_MAC_RESET);
> -}
> -
> -static void exynos_pcie_assert_phy_reset(struct pcie_port *pp)
> -{
> -	void __iomem *purple_base = pp->purple_base;
> -
> -	writel(0, purple_base + PCIE_PHY_MAC_RESET);
> -	writel(1, purple_base + PCIE_PHY_GLOBAL_RESET);
> -}
> -
> -static void exynos_pcie_deassert_phy_reset(struct pcie_port *pp)
> -{
> -	void __iomem *elbi_base = pp->elbi_base;
> -	void __iomem *purple_base = pp->purple_base;
> -
> -	writel(0, purple_base + PCIE_PHY_GLOBAL_RESET);
> -	writel(1, elbi_base + PCIE_PWR_RESET);
> -	writel(0, purple_base + PCIE_PHY_COMMON_RESET);
> -	writel(0, purple_base + PCIE_PHY_CMN_REG);
> -	writel(0, purple_base + PCIE_PHY_TRSVREG_RESET);
> -	writel(0, purple_base + PCIE_PHY_TRSV_RESET);
> -}
> -
> -static void exynos_pcie_init_phy(struct pcie_port *pp)
> -{
> -	void __iomem *phy_base = pp->phy_base;
> -
> -	/* DCC feedback control off */
> -	writel(0x29, phy_base + PCIE_PHY_DCC_FEEDBACK);
> -
> -	/* set TX/RX impedance */
> -	writel(0xd5, phy_base + PCIE_PHY_IMPEDANCE);
> -
> -	/* set 50Mhz PHY clock */
> -	writel(0x14, phy_base + PCIE_PHY_PLL_DIV_0);
> -	writel(0x12, phy_base + PCIE_PHY_PLL_DIV_1);
> -
> -	/* set TX Differential output for lane 0 */
> -	writel(0x7f, phy_base + PCIE_PHY_TRSV0_DRV_LVL);
> -
> -	/* set TX Pre-emphasis Level Control for lane 0 to minimum */
> -	writel(0x0, phy_base + PCIE_PHY_TRSV0_EMP_LVL);
> -
> -	/* set RX clock and data recovery bandwidth */
> -	writel(0xe7, phy_base + PCIE_PHY_PLL_BIAS);
> -	writel(0x82, phy_base + PCIE_PHY_TRSV0_RXCDR);
> -	writel(0x82, phy_base + PCIE_PHY_TRSV1_RXCDR);
> -	writel(0x82, phy_base + PCIE_PHY_TRSV2_RXCDR);
> -	writel(0x82, phy_base + PCIE_PHY_TRSV3_RXCDR);
> -
> -	/* change TX Pre-emphasis Level Control for lanes */
> -	writel(0x39, phy_base + PCIE_PHY_TRSV0_EMP_LVL);
> -	writel(0x39, phy_base + PCIE_PHY_TRSV1_EMP_LVL);
> -	writel(0x39, phy_base + PCIE_PHY_TRSV2_EMP_LVL);
> -	writel(0x39, phy_base + PCIE_PHY_TRSV3_EMP_LVL);
> -
> -	/* set LVCC */
> -	writel(0x20, phy_base + PCIE_PHY_TRSV0_LVCC);
> -	writel(0xa0, phy_base + PCIE_PHY_TRSV1_LVCC);
> -	writel(0xa0, phy_base + PCIE_PHY_TRSV2_LVCC);
> -	writel(0xa0, phy_base + PCIE_PHY_TRSV3_LVCC);
> -}
> -
> -static void exynos_pcie_assert_reset(struct pcie_port *pp)
> -{
> -	if (pp->reset_gpio >= 0)
> -		devm_gpio_request_one(pp->dev, pp->reset_gpio,
> -				GPIOF_OUT_INIT_HIGH, "RESET");
> -	return;
> -}
> -
> -static int exynos_pcie_establish_link(struct pcie_port *pp)
> -{
> -	u32 val;
> -	int count = 0;
> -	void __iomem *elbi_base = pp->elbi_base;
> -	void __iomem *purple_base = pp->purple_base;
> -	void __iomem *phy_base = pp->phy_base;
> -
> -	if (exynos_pcie_link_up(pp)) {
> -		dev_err(pp->dev, "Link already up\n");
> -		return 0;
> -	}
> -
> -	/* assert reset signals */
> -	exynos_pcie_assert_core_reset(pp);
> -	exynos_pcie_assert_phy_reset(pp);
> -
> -	/* de-assert phy reset */
> -	exynos_pcie_deassert_phy_reset(pp);
> -
> -	/* initialize phy */
> -	exynos_pcie_init_phy(pp);
> -
> -	/* pulse for common reset */
> -	writel(1, purple_base + PCIE_PHY_COMMON_RESET);
> -	udelay(500);
> -	writel(0, purple_base + PCIE_PHY_COMMON_RESET);
> -
> -	/* de-assert core reset */
> -	exynos_pcie_deassert_core_reset(pp);
> -
> -	/* setup root complex */
> -	exynos_pcie_setup_rc(pp);
> -
> -	/* assert reset signal */
> -	exynos_pcie_assert_reset(pp);
> -
> -	/* assert LTSSM enable */
> -	writel(PCIE_ELBI_LTSSM_ENABLE, elbi_base + PCIE_APP_LTSSM_ENABLE);
> -
> -	/* check if the link is up or not */
> -	while (!exynos_pcie_link_up(pp)) {
> -		mdelay(100);
> -		count++;
> -		if (count == 10) {
> -			while (readl(phy_base + PCIE_PHY_PLL_LOCKED) == 0) {
> -				val = readl(purple_base + PCIE_PHY_PLL_LOCKED);
> -				dev_info(pp->dev, "PLL Locked: 0x%x\n", val);
> -			}
> -			dev_err(pp->dev, "PCIe Link Fail\n");
> -			return -EINVAL;
> -		}
> -	}
> -
> -	dev_info(pp->dev, "Link up\n");
> -
> -	return 0;
> -}
> -
> -static void exynos_pcie_clear_irq_pulse(struct pcie_port *pp)
> -{
> -	u32 val;
> -	void __iomem *elbi_base = pp->elbi_base;
> -
> -	val = readl(elbi_base + PCIE_IRQ_PULSE);
> -	writel(val, elbi_base + PCIE_IRQ_PULSE);
> -	return;
> -}
> -
> -static void exynos_pcie_enable_irq_pulse(struct pcie_port *pp)
> -{
> -	u32 val;
> -	void __iomem *elbi_base = pp->elbi_base;
> -
> -	/* enable INTX interrupt */
> -	val = IRQ_INTA_ASSERT | IRQ_INTB_ASSERT |
> -		IRQ_INTC_ASSERT | IRQ_INTD_ASSERT,
> -	writel(val, elbi_base + PCIE_IRQ_EN_PULSE);
> -	return;
> -}
> -
> -static irqreturn_t exynos_pcie_irq_handler(int irq, void *arg)
> -{
> -	struct pcie_port *pp = arg;
> -
> -	exynos_pcie_clear_irq_pulse(pp);
> -	return IRQ_HANDLED;
> -}
> -
> -static void exynos_pcie_enable_interrupts(struct pcie_port *pp)
> -{
> -	exynos_pcie_enable_irq_pulse(pp);
> -	return;
> -}
> -
> -static void exynos_pcie_host_init(struct pcie_port *pp)
> -{
> -	struct pcie_port_info *config = &pp->config;
> -	u32 val;
> -
> -	/* Keep first 64K for IO */
> -	pp->cfg0_base = pp->cfg.start;
> -	pp->cfg1_base = pp->cfg.start + config->cfg0_size;
> -	pp->io_base = pp->io.start;
> -	pp->mem_base = pp->mem.start;
> -
> -	/* enable link */
> -	exynos_pcie_establish_link(pp);
> -
> -	exynos_pcie_wr_own_conf(pp, PCI_BASE_ADDRESS_0, 4, 0);
> -
> -	/* program correct class for RC */
> -	exynos_pcie_wr_own_conf(pp, PCI_CLASS_DEVICE, 2, PCI_CLASS_BRIDGE_PCI);
> -
> -	exynos_pcie_rd_own_conf(pp, PCIE_LINK_WIDTH_SPEED_CONTROL, 4, &val);
> -	val |= PORT_LOGIC_SPEED_CHANGE;
> -	exynos_pcie_wr_own_conf(pp, PCIE_LINK_WIDTH_SPEED_CONTROL, 4, val);
> -
> -	exynos_pcie_enable_interrupts(pp);
> -}
> -
> -static int add_pcie_port(struct pcie_port *pp, struct platform_device *pdev)
> -{
> -	struct resource *elbi_base;
> -	struct resource *phy_base;
> -	struct resource *purple_base;
> -	int ret;
> -
> -	elbi_base = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> -	if (!elbi_base) {
> -		dev_err(&pdev->dev, "couldn't get elbi base resource\n");
> -		return -EINVAL;
> -	}
> -	pp->elbi_base = devm_ioremap_resource(&pdev->dev, elbi_base);
> -	if (IS_ERR(pp->elbi_base))
> -		return PTR_ERR(pp->elbi_base);
> -
> -	phy_base = platform_get_resource(pdev, IORESOURCE_MEM, 1);
> -	if (!phy_base) {
> -		dev_err(&pdev->dev, "couldn't get phy base resource\n");
> -		return -EINVAL;
> -	}
> -	pp->phy_base = devm_ioremap_resource(&pdev->dev, phy_base);
> -	if (IS_ERR(pp->phy_base))
> -		return PTR_ERR(pp->phy_base);
> -
> -	purple_base = platform_get_resource(pdev, IORESOURCE_MEM, 2);
> -	if (!purple_base) {
> -		dev_err(&pdev->dev, "couldn't get purple base resource\n");
> -		return -EINVAL;
> -	}
> -	pp->purple_base = devm_ioremap_resource(&pdev->dev, purple_base);
> -	if (IS_ERR(pp->purple_base))
> -		return PTR_ERR(pp->purple_base);
> -
> -	pp->irq = platform_get_irq(pdev, 1);
> -	if (!pp->irq) {
> -		dev_err(&pdev->dev, "failed to get irq\n");
> -		return -ENODEV;
> -	}
> -	ret = devm_request_irq(&pdev->dev, pp->irq, exynos_pcie_irq_handler,
> -				IRQF_SHARED, "exynos-pcie", pp);
> -	if (ret) {
> -		dev_err(&pdev->dev, "failed to request irq\n");
> -		return ret;
> -	}
> -
> -	pp->dbi_base = devm_ioremap(&pdev->dev, pp->cfg.start,
> -				resource_size(&pp->cfg));
> -	if (!pp->dbi_base) {
> -		dev_err(&pdev->dev, "error with ioremap\n");
> -		return -ENOMEM;
> -	}
> -
> -	pp->root_bus_nr = -1;
> -
> -	spin_lock_init(&pp->conf_lock);
> -	exynos_pcie_host_init(pp);
> -	pp->va_cfg0_base = devm_ioremap(&pdev->dev, pp->cfg0_base,
> -					pp->config.cfg0_size);
> -	if (!pp->va_cfg0_base) {
> -		dev_err(pp->dev, "error with ioremap in function\n");
> -		return -ENOMEM;
> -	}
> -	pp->va_cfg1_base = devm_ioremap(&pdev->dev, pp->cfg1_base,
> -					pp->config.cfg1_size);
> -	if (!pp->va_cfg1_base) {
> -		dev_err(pp->dev, "error with ioremap\n");
> -		return -ENOMEM;
> -	}
> -
> -	return 0;
> -}
> -
> -static int __init exynos_pcie_probe(struct platform_device *pdev)
> -{
> -	struct pcie_port *pp;
> -	struct device_node *np = pdev->dev.of_node;
> -	struct of_pci_range range;
> -	struct of_pci_range_parser parser;
> -	int ret;
> -
> -	pp = devm_kzalloc(&pdev->dev, sizeof(*pp), GFP_KERNEL);
> -	if (!pp) {
> -		dev_err(&pdev->dev, "no memory for pcie port\n");
> -		return -ENOMEM;
> -	}
> -
> -	pp->dev = &pdev->dev;
> -
> -	if (of_pci_range_parser_init(&parser, np)) {
> -		dev_err(&pdev->dev, "missing ranges property\n");
> -		return -EINVAL;
> -	}
> -
> -	/* Get the I/O and memory ranges from DT */
> -	for_each_of_pci_range(&parser, &range) {
> -		unsigned long restype = range.flags & IORESOURCE_TYPE_BITS;
> -		if (restype == IORESOURCE_IO) {
> -			of_pci_range_to_resource(&range, np, &pp->io);
> -			pp->io.name = "I/O";
> -			pp->io.start = max_t(resource_size_t,
> -					     PCIBIOS_MIN_IO,
> -					     range.pci_addr + global_io_offset);
> -			pp->io.end = min_t(resource_size_t,
> -					   IO_SPACE_LIMIT,
> -					   range.pci_addr + range.size
> -					   + global_io_offset);
> -			pp->config.io_size = resource_size(&pp->io);
> -			pp->config.io_bus_addr = range.pci_addr;
> -		}
> -		if (restype == IORESOURCE_MEM) {
> -			of_pci_range_to_resource(&range, np, &pp->mem);
> -			pp->mem.name = "MEM";
> -			pp->config.mem_size = resource_size(&pp->mem);
> -			pp->config.mem_bus_addr = range.pci_addr;
> -		}
> -		if (restype == 0) {
> -			of_pci_range_to_resource(&range, np, &pp->cfg);
> -			pp->config.cfg0_size = resource_size(&pp->cfg)/2;
> -			pp->config.cfg1_size = resource_size(&pp->cfg)/2;
> -		}
> -	}
> -
> -	pp->reset_gpio = of_get_named_gpio(np, "reset-gpio", 0);
> -
> -	pp->clk = devm_clk_get(&pdev->dev, "pcie");
> -	if (IS_ERR(pp->clk)) {
> -		dev_err(&pdev->dev, "Failed to get pcie rc clock\n");
> -		return PTR_ERR(pp->clk);
> -	}
> -	ret = clk_prepare_enable(pp->clk);
> -	if (ret)
> -		return ret;
> -
> -	pp->bus_clk = devm_clk_get(&pdev->dev, "pcie_bus");
> -	if (IS_ERR(pp->bus_clk)) {
> -		dev_err(&pdev->dev, "Failed to get pcie bus clock\n");
> -		ret = PTR_ERR(pp->bus_clk);
> -		goto fail_clk;
> -	}
> -	ret = clk_prepare_enable(pp->bus_clk);
> -	if (ret)
> -		goto fail_clk;
> -
> -	ret = add_pcie_port(pp, pdev);
> -	if (ret < 0)
> -		goto fail_bus_clk;
> -
> -	pp->controller = exynos_pci.nr_controllers;
> -	exynos_pci.nr_controllers = 1;
> -	exynos_pci.private_data = (void **)&pp;
> -
> -	pci_common_init(&exynos_pci);
> -	pci_assign_unassigned_resources();
> -#ifdef CONFIG_PCI_DOMAINS
> -	exynos_pci.domain++;
> -#endif
> -
> -	platform_set_drvdata(pdev, pp);
> -	return 0;
> -
> -fail_bus_clk:
> -	clk_disable_unprepare(pp->bus_clk);
> -fail_clk:
> -	clk_disable_unprepare(pp->clk);
> -	return ret;
> -}
> -
> -static int __exit exynos_pcie_remove(struct platform_device *pdev)
> -{
> -	struct pcie_port *pp = platform_get_drvdata(pdev);
> -
> -	clk_disable_unprepare(pp->bus_clk);
> -	clk_disable_unprepare(pp->clk);
> -
> -	return 0;
> -}
> -
> -static const struct of_device_id exynos_pcie_of_match[] = {
> -	{ .compatible = "samsung,exynos5440-pcie", },
> -	{},
> -};
> -MODULE_DEVICE_TABLE(of, exynos_pcie_of_match);
> -
> -static struct platform_driver exynos_pcie_driver = {
> -	.remove		= __exit_p(exynos_pcie_remove),
> -	.driver = {
> -		.name	= "exynos-pcie",
> -		.owner	= THIS_MODULE,
> -		.of_match_table = of_match_ptr(exynos_pcie_of_match),
> -	},
> -};
> -
> -static int exynos_pcie_abort(unsigned long addr, unsigned int fsr,
> -			struct pt_regs *regs)
> -{
> -	unsigned long pc = instruction_pointer(regs);
> -	unsigned long instr = *(unsigned long *)pc;
> -
> -	WARN_ONCE(1, "pcie abort\n");
> -
> -	/*
> -	 * If the instruction being executed was a read,
> -	 * make it look like it read all-ones.
> -	 */
> -	if ((instr & 0x0c100000) == 0x04100000) {
> -		int reg = (instr >> 12) & 15;
> -		unsigned long val;
> -
> -		if (instr & 0x00400000)
> -			val = 255;
> -		else
> -			val = -1;
> -
> -		regs->uregs[reg] = val;
> -		regs->ARM_pc += 4;
> -		return 0;
> -	}
> -
> -	if ((instr & 0x0e100090) == 0x00100090) {
> -		int reg = (instr >> 12) & 15;
> -
> -		regs->uregs[reg] = -1;
> -		regs->ARM_pc += 4;
> -		return 0;
> -	}
> -
> -	return 1;
> -}
> -
> -/* Exynos PCIe driver does not allow module unload */
> -
> -static int __init pcie_init(void)
> -{
> -	hook_fault_code(16 + 6, exynos_pcie_abort, SIGBUS, 0,
> -			"imprecise external abort");
> -
> -	platform_driver_probe(&exynos_pcie_driver, exynos_pcie_probe);
> -
> -	return 0;
> +	dw_pcie_writel_rc(pp, val, dbi_base + PCI_COMMAND);
>  }
> -subsys_initcall(pcie_init);

How about making this a separate driver in itself that does all the
configurations for designware core? By this I mean we can have a separate dt
node (child node of soc specific wrapper), that will have all the configuration
space/IO space and memory space. pci_common_init/dw_pcie_host_init should be
done in this driver.
We just need to think about a way of passing the ops (since that looks like
very much needed because of the sideband bits you have to enable before
reading/writing).

Thanks
Kishon
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Jingoo Han July 11, 2013, 7:05 a.m. UTC | #2

On Thursday, July 11, 2013 3:40 PM, Kishon Vijay Abraham I wrote:
> On Thursday 11 July 2013 11:19 AM, Jingoo Han wrote:
> >
> >  drivers/pci/host/Makefile          |    1 +
> >  drivers/pci/host/pcie-designware.c |  963 +++++++++---------------------------
> >  drivers/pci/host/pcie-designware.h |   71 +++
> >  drivers/pci/host/pcie-exynos.c     |  523 ++++++++++++++++++++
> >  4 files changed, 822 insertions(+), 736 deletions(-)
> >  create mode 100644 drivers/pci/host/pcie-designware.h
> >  create mode 100644 drivers/pci/host/pcie-exynos.c
> >
> > diff --git a/drivers/pci/host/Makefile b/drivers/pci/host/Makefile
> > index 086d850..7e59864 100644
> > --- a/drivers/pci/host/Makefile
> > +++ b/drivers/pci/host/Makefile
> > @@ -1,2 +1,3 @@
> >  obj-$(CONFIG_PCI_MVEBU) += pci-mvebu.o
> >  obj-$(CONFIG_PCIE_DW) += pcie-designware.o
> > +obj-$(CONFIG_PCI_EXYNOS) += pcie-exynos.o
> > diff --git a/drivers/pci/host/pcie-designware.c b/drivers/pci/host/pcie-designware.c
[...]
> 
> How about making this a separate driver in itself that does all the
> configurations for designware core? By this I mean we can have a separate dt
> node (child node of soc specific wrapper), that will have all the configuration
> space/IO space and memory space. pci_common_init/dw_pcie_host_init should be
> done in this driver.
> We just need to think about a way of passing the ops (since that looks like
> very much needed because of the sideband bits you have to enable before
> reading/writing).
> 

CC'ed Seungwon Jeon(DW-MMC Maintainer), Yulgon Kim (DW-USB Developer)


Um, maybe you mean dwc3 usb driver (./drivers/usb/dwc3/)'?

But, I referenced dw mmc driver (./drivers/mmc/host/dw_mmc*.c).

Now, Exynos PCIe driver, Spear PCIe driver[1], and i.MX PCIe driver[2]
are submitted to PCIe mailing-list, these are using designware PCIe core.

There are many differences between Exynos PCIe and Spear PCIe.
Also, for Exynos PCIe, platform specific part will be changed more.

Thus, the dw mmc driver model looked more suitable.


[1] http://permalink.gmane.org/gmane.linux.kernel.pci/18400
[2] http://www.spinics.net/lists/linux-pci/msg23489.html


Best regards,
Jingoo Han


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Kishon Vijay Abraham I July 11, 2013, 8:35 a.m. UTC | #3

Hi,

On Thursday 11 July 2013 12:35 PM, Jingoo Han wrote:
> On Thursday, July 11, 2013 3:40 PM, Kishon Vijay Abraham I wrote:
>> On Thursday 11 July 2013 11:19 AM, Jingoo Han wrote:
>>>
>>>  drivers/pci/host/Makefile          |    1 +
>>>  drivers/pci/host/pcie-designware.c |  963 +++++++++---------------------------
>>>  drivers/pci/host/pcie-designware.h |   71 +++
>>>  drivers/pci/host/pcie-exynos.c     |  523 ++++++++++++++++++++
>>>  4 files changed, 822 insertions(+), 736 deletions(-)
>>>  create mode 100644 drivers/pci/host/pcie-designware.h
>>>  create mode 100644 drivers/pci/host/pcie-exynos.c
>>>
>>> diff --git a/drivers/pci/host/Makefile b/drivers/pci/host/Makefile
>>> index 086d850..7e59864 100644
>>> --- a/drivers/pci/host/Makefile
>>> +++ b/drivers/pci/host/Makefile
>>> @@ -1,2 +1,3 @@
>>>  obj-$(CONFIG_PCI_MVEBU) += pci-mvebu.o
>>>  obj-$(CONFIG_PCIE_DW) += pcie-designware.o
>>> +obj-$(CONFIG_PCI_EXYNOS) += pcie-exynos.o
>>> diff --git a/drivers/pci/host/pcie-designware.c b/drivers/pci/host/pcie-designware.c
> [...]
>>
>> How about making this a separate driver in itself that does all the
>> configurations for designware core? By this I mean we can have a separate dt
>> node (child node of soc specific wrapper), that will have all the configuration
>> space/IO space and memory space. pci_common_init/dw_pcie_host_init should be
>> done in this driver.
>> We just need to think about a way of passing the ops (since that looks like
>> very much needed because of the sideband bits you have to enable before
>> reading/writing).
>>
> 
> CC'ed Seungwon Jeon(DW-MMC Maintainer), Yulgon Kim (DW-USB Developer)
> 
> 
> Um, maybe you mean dwc3 usb driver (./drivers/usb/dwc3/)'?
> 
> But, I referenced dw mmc driver (./drivers/mmc/host/dw_mmc*.c).
> 
> Now, Exynos PCIe driver, Spear PCIe driver[1], and i.MX PCIe driver[2]
> are submitted to PCIe mailing-list, these are using designware PCIe core.
> 
> There are many differences between Exynos PCIe and Spear PCIe.
> Also, for Exynos PCIe, platform specific part will be changed more.
> 
> Thus, the dw mmc driver model looked more suitable.

Alright. I'll go ahead with a similar implementation then.

Thanks
Kishon
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Kishon Vijay Abraham I July 11, 2013, 8:54 a.m. UTC | #4

Hi,

On Thursday 11 July 2013 11:19 AM, Jingoo Han wrote:
> Exynos PCIe IP consists of Synopsys specific part and Exynos
> specific part. Only core block is a Synopsys designware part;
> other parts are Exynos specific.
> Also, the Synopsys designware part can be shared with other
> platforms; thus, it can be split two parts such as Synopsys
> designware part and Exynos specific part.
> 
> Signed-off-by: Jingoo Han <[e-mail]>
> Cc: Pratyush Anand <[e-mail]>
> Cc: Mohit KUMAR <[e-mail]>
> ---
.
.
<snip>
.
.
> +
> +/* Exynos PCIe driver does not allow module unload */

Just curious, why is this restriction?

Thanks
Kishon
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Thierry Reding July 11, 2013, 3:41 p.m. UTC | #5

On Thu, Jul 11, 2013 at 02:49:43PM +0900, Jingoo Han wrote:
[...]
> diff --git a/drivers/pci/host/Makefile b/drivers/pci/host/Makefile
[...]
>  obj-$(CONFIG_PCI_MVEBU) += pci-mvebu.o
>  obj-$(CONFIG_PCIE_DW) += pcie-designware.o
> +obj-$(CONFIG_PCI_EXYNOS) += pcie-exynos.o

I think we should keep these sorted alphabetically. Also Tegra and
Marvell are PCIe controllers but they still use the pci- prefix instead
of pcie-. Perhaps it'd be good to keep consistency here? I initially
chose pci- because from a software point of view it doesn't matter all
that much whether it's PCI or PCIe and because the drivers are part of
the PCI subsystem. However if Exynos now uses the pcie- prefix it makes
it look like Tegra and Marvell are plain old PCI.

Thierry

Jingoo Han July 11, 2013, 11:28 p.m. UTC | #6

On Friday, July 12, 2013 12:41 AM, Thierry Reding wrote:
> On Thu, Jul 11, 2013 at 02:49:43PM +0900, Jingoo Han wrote:
> [...]
> > diff --git a/drivers/pci/host/Makefile b/drivers/pci/host/Makefile
> [...]
> >  obj-$(CONFIG_PCI_MVEBU) += pci-mvebu.o
> >  obj-$(CONFIG_PCIE_DW) += pcie-designware.o
> > +obj-$(CONFIG_PCI_EXYNOS) += pcie-exynos.o
> 
> I think we should keep these sorted alphabetically. Also Tegra and
> Marvell are PCIe controllers but they still use the pci- prefix instead
> of pcie-. Perhaps it'd be good to keep consistency here? I initially
> chose pci- because from a software point of view it doesn't matter all
> that much whether it's PCI or PCIe and because the drivers are part of
> the PCI subsystem. However if Exynos now uses the pcie- prefix it makes
> it look like Tegra and Marvell are plain old PCI.
> 

Hi Thierry,

I initially chose 'pci-' prefix such as 'pci-designware.c'.

However, Pratyush Anand suggested as below:
"I would suggest to rename it as pcie-designware.c,
because synopsis pcie and pci controllers are different."

If you have a good idea, please give it to me. :)
Thank you.

Best regards,
Jingoo Han


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Jingoo Han July 12, 2013, midnight UTC | #7

On Thursday, July 11, 2013 5:55 PM, Kishon Vijay Abraham I wrote:
> On Thursday 11 July 2013 11:19 AM, Jingoo Han wrote:
> > Exynos PCIe IP consists of Synopsys specific part and Exynos
> > specific part. Only core block is a Synopsys designware part;
> > other parts are Exynos specific.
> > Also, the Synopsys designware part can be shared with other
> > platforms; thus, it can be split two parts such as Synopsys
> > designware part and Exynos specific part.
> >
> > Signed-off-by: Jingoo Han <[e-mail]>
> > Cc: Pratyush Anand <[e-mail]>
> > Cc: Mohit KUMAR <[e-mail]>
> > ---
> .
> .
> <snip>
> .
> .
> > +
> > +/* Exynos PCIe driver does not allow module unload */
> 
> Just curious, why is this restriction?

CC'ed Thierry Reding,

Hi Kishon,

That's a good question.

Now, we don't have the solution to "be able to load and unload
the PCI host driver in a loop definitely without crashing or exposing
any races  or leaks", as Arnd Bergmann said.
Please refer to the following thread in mailing-list.
(http://archive.arm.linux.org.uk/lurker/message/20130614.123849.4ff363c5.pl.html)

Thus, Exynos PCIe did not support unloading module.
(http://archive.arm.linux.org.uk/lurker/message/20130614.125338.7d2bbf62.pl.html)

Best regards,
Jingoo Han


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Kishon Vijay Abraham I July 12, 2013, 5:23 a.m. UTC | #8

On Friday 12 July 2013 05:30 AM, Jingoo Han wrote:
> On Thursday, July 11, 2013 5:55 PM, Kishon Vijay Abraham I wrote:
>> On Thursday 11 July 2013 11:19 AM, Jingoo Han wrote:
>>> Exynos PCIe IP consists of Synopsys specific part and Exynos
>>> specific part. Only core block is a Synopsys designware part;
>>> other parts are Exynos specific.
>>> Also, the Synopsys designware part can be shared with other
>>> platforms; thus, it can be split two parts such as Synopsys
>>> designware part and Exynos specific part.
>>>
>>> Signed-off-by: Jingoo Han <[e-mail]>
>>> Cc: Pratyush Anand <[e-mail]>
>>> Cc: Mohit KUMAR <[e-mail]>
>>> ---
>> .
>> .
>> <snip>
>> .
>> .
>>> +
>>> +/* Exynos PCIe driver does not allow module unload */
>>
>> Just curious, why is this restriction?
> 
> CC'ed Thierry Reding,
> 
> Hi Kishon,
> 
> That's a good question.
> 
> Now, we don't have the solution to "be able to load and unload
> the PCI host driver in a loop definitely without crashing or exposing
> any races  or leaks", as Arnd Bergmann said.
> Please refer to the following thread in mailing-list.
> (http://archive.arm.linux.org.uk/lurker/message/20130614.123849.4ff363c5.pl.html)

That explains.

Thanks
Kishon
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Kishon Vijay Abraham I July 12, 2013, 10:01 a.m. UTC | #9

Hi,

On Thursday 11 July 2013 11:19 AM, Jingoo Han wrote:
> Exynos PCIe IP consists of Synopsys specific part and Exynos
> specific part. Only core block is a Synopsys designware part;
> other parts are Exynos specific.
> Also, the Synopsys designware part can be shared with other
> platforms; thus, it can be split two parts such as Synopsys
> designware part and Exynos specific part.
> 
> Signed-off-by: Jingoo Han <[e-mail]>
> Cc: Pratyush Anand <[e-mail]>
> Cc: Mohit KUMAR <[e-mail]>
> ---
> Changes since v1:
> - moved the configuration, I/O, memory space handling to dw_pcie_host_init()
> - removed exynos_pcie_abort()
> - replaced 'purple_base' with 'block_base'
> - replaced 'dbi_base' with 'dbi_addr'
> 
>  drivers/pci/host/Makefile          |    1 +
>  drivers/pci/host/pcie-designware.c |  963 +++++++++---------------------------
>  drivers/pci/host/pcie-designware.h |   71 +++
>  drivers/pci/host/pcie-exynos.c     |  523 ++++++++++++++++++++
>  4 files changed, 822 insertions(+), 736 deletions(-)
>  create mode 100644 drivers/pci/host/pcie-designware.h
>  create mode 100644 drivers/pci/host/pcie-exynos.c
> 
> diff --git a/drivers/pci/host/Makefile b/drivers/pci/host/Makefile
> index 086d850..7e59864 100644
> --- a/drivers/pci/host/Makefile
> +++ b/drivers/pci/host/Makefile
> @@ -1,2 +1,3 @@
>  obj-$(CONFIG_PCI_MVEBU) += pci-mvebu.o
>  obj-$(CONFIG_PCIE_DW) += pcie-designware.o
> +obj-$(CONFIG_PCI_EXYNOS) += pcie-exynos.o
> diff --git a/drivers/pci/host/pcie-designware.c b/drivers/pci/host/pcie-designware.c
> index 26bdbda..b372ead 100644
> --- a/drivers/pci/host/pcie-designware.c
> +++ b/drivers/pci/host/pcie-designware.c
> @@ -1,5 +1,5 @@
>  /*
> - * PCIe host controller driver for Samsung EXYNOS SoCs
> + * Synopsys Designware PCIe host controller driver
>   *
>   * Copyright (C) 2013 Samsung Electronics Co., Ltd.
>   *		http://www.samsung.com
> @@ -11,64 +11,14 @@
>   * published by the Free Software Foundation.
>   */
>  
> -#include <linux/clk.h>
> -#include <linux/delay.h>
> -#include <linux/gpio.h>
> -#include <linux/interrupt.h>
>  #include <linux/kernel.h>
> -#include <linux/list.h>
>  #include <linux/module.h>
> -#include <linux/of.h>
>  #include <linux/of_address.h>
> -#include <linux/of_gpio.h>
> -#include <linux/of_pci.h>
>  #include <linux/pci.h>
>  #include <linux/pci_regs.h>
> -#include <linux/platform_device.h>
> -#include <linux/resource.h>
> -#include <linux/signal.h>
> -#include <linux/slab.h>
>  #include <linux/types.h>
>  
> -struct pcie_port_info {
> -	u32		cfg0_size;
> -	u32		cfg1_size;
> -	u32		io_size;
> -	u32		mem_size;
> -	phys_addr_t	io_bus_addr;
> -	phys_addr_t	mem_bus_addr;
> -};
> -
> -struct pcie_port {
> -	struct device		*dev;
> -	u8			controller;
> -	u8			root_bus_nr;
> -	void __iomem		*dbi_base;
> -	void __iomem		*elbi_base;
> -	void __iomem		*phy_base;
> -	void __iomem		*purple_base;
> -	u64			cfg0_base;
> -	void __iomem		*va_cfg0_base;
> -	u64			cfg1_base;
> -	void __iomem		*va_cfg1_base;
> -	u64			io_base;
> -	u64			mem_base;
> -	spinlock_t		conf_lock;
> -	struct resource		cfg;
> -	struct resource		io;
> -	struct resource		mem;
> -	struct pcie_port_info	config;
> -	struct clk		*clk;
> -	struct clk		*bus_clk;
> -	int			irq;
> -	int			reset_gpio;
> -};
> -
> -/*
> - * Exynos PCIe IP consists of Synopsys specific part and Exynos
> - * specific part. Only core block is a Synopsys designware part;
> - * other parts are Exynos specific.
> - */
> +#include "pcie-designware.h"
>  
>  /* Synopsis specific PCIE configuration registers */
>  #define PCIE_PORT_LINK_CONTROL		0x710
> @@ -108,69 +58,14 @@ struct pcie_port {
>  #define PCIE_ATU_FUNC(x)		(((x) & 0x7) << 16)
>  #define PCIE_ATU_UPPER_TARGET		0x91C
>  
> -/* Exynos specific PCIE configuration registers */
> -
> -/* PCIe ELBI registers */
> -#define PCIE_IRQ_PULSE			0x000
> -#define IRQ_INTA_ASSERT			(0x1 << 0)
> -#define IRQ_INTB_ASSERT			(0x1 << 2)
> -#define IRQ_INTC_ASSERT			(0x1 << 4)
> -#define IRQ_INTD_ASSERT			(0x1 << 6)
> -#define PCIE_IRQ_LEVEL			0x004
> -#define PCIE_IRQ_SPECIAL		0x008
> -#define PCIE_IRQ_EN_PULSE		0x00c
> -#define PCIE_IRQ_EN_LEVEL		0x010
> -#define PCIE_IRQ_EN_SPECIAL		0x014
> -#define PCIE_PWR_RESET			0x018
> -#define PCIE_CORE_RESET			0x01c
> -#define PCIE_CORE_RESET_ENABLE		(0x1 << 0)
> -#define PCIE_STICKY_RESET		0x020
> -#define PCIE_NONSTICKY_RESET		0x024
> -#define PCIE_APP_INIT_RESET		0x028
> -#define PCIE_APP_LTSSM_ENABLE		0x02c
> -#define PCIE_ELBI_RDLH_LINKUP		0x064
> -#define PCIE_ELBI_LTSSM_ENABLE		0x1
> -#define PCIE_ELBI_SLV_AWMISC		0x11c
> -#define PCIE_ELBI_SLV_ARMISC		0x120
> -#define PCIE_ELBI_SLV_DBI_ENABLE	(0x1 << 21)
> -
> -/* PCIe Purple registers */
> -#define PCIE_PHY_GLOBAL_RESET		0x000
> -#define PCIE_PHY_COMMON_RESET		0x004
> -#define PCIE_PHY_CMN_REG		0x008
> -#define PCIE_PHY_MAC_RESET		0x00c
> -#define PCIE_PHY_PLL_LOCKED		0x010
> -#define PCIE_PHY_TRSVREG_RESET		0x020
> -#define PCIE_PHY_TRSV_RESET		0x024
> -
> -/* PCIe PHY registers */
> -#define PCIE_PHY_IMPEDANCE		0x004
> -#define PCIE_PHY_PLL_DIV_0		0x008
> -#define PCIE_PHY_PLL_BIAS		0x00c
> -#define PCIE_PHY_DCC_FEEDBACK		0x014
> -#define PCIE_PHY_PLL_DIV_1		0x05c
> -#define PCIE_PHY_TRSV0_EMP_LVL		0x084
> -#define PCIE_PHY_TRSV0_DRV_LVL		0x088
> -#define PCIE_PHY_TRSV0_RXCDR		0x0ac
> -#define PCIE_PHY_TRSV0_LVCC		0x0dc
> -#define PCIE_PHY_TRSV1_EMP_LVL		0x144
> -#define PCIE_PHY_TRSV1_RXCDR		0x16c
> -#define PCIE_PHY_TRSV1_LVCC		0x19c
> -#define PCIE_PHY_TRSV2_EMP_LVL		0x204
> -#define PCIE_PHY_TRSV2_RXCDR		0x22c
> -#define PCIE_PHY_TRSV2_LVCC		0x25c
> -#define PCIE_PHY_TRSV3_EMP_LVL		0x2c4
> -#define PCIE_PHY_TRSV3_RXCDR		0x2ec
> -#define PCIE_PHY_TRSV3_LVCC		0x31c
> -
> -static struct hw_pci exynos_pci;
> +unsigned long global_io_offset;
>  
>  static inline struct pcie_port *sys_to_pcie(struct pci_sys_data *sys)
>  {
>  	return sys->private_data;
>  }
>  
> -static inline int cfg_read(void *addr, int where, int size, u32 *val)
> +int cfg_read(void *addr, int where, int size, u32 *val)
>  {
>  	*val = readl(addr);
>  
> @@ -184,7 +79,7 @@ static inline int cfg_read(void *addr, int where, int size, u32 *val)
>  	return PCIBIOS_SUCCESSFUL;
>  }
>  
> -static inline int cfg_write(void *addr, int where, int size, u32 val)
> +int cfg_write(void *addr, int where, int size, u32 val)
>  {
>  	if (size == 4)
>  		writel(val, addr);
> @@ -198,155 +93,225 @@ static inline int cfg_write(void *addr, int where, int size, u32 val)
>  	return PCIBIOS_SUCCESSFUL;
>  }
>  
> -static void exynos_pcie_sideband_dbi_w_mode(struct pcie_port *pp, bool on)
> -{
> -	u32 val;
> -
> -	if (on) {
> -		val = readl(pp->elbi_base + PCIE_ELBI_SLV_AWMISC);
> -		val |= PCIE_ELBI_SLV_DBI_ENABLE;
> -		writel(val, pp->elbi_base + PCIE_ELBI_SLV_AWMISC);
> -	} else {
> -		val = readl(pp->elbi_base + PCIE_ELBI_SLV_AWMISC);
> -		val &= ~PCIE_ELBI_SLV_DBI_ENABLE;
> -		writel(val, pp->elbi_base + PCIE_ELBI_SLV_AWMISC);
> -	}
> -}
> -
> -static void exynos_pcie_sideband_dbi_r_mode(struct pcie_port *pp, bool on)
> +static inline void dw_pcie_readl_rc(struct pcie_port *pp,
> +				void __iomem *dbi_addr, u32 *val)
>  {
> -	u32 val;
> -
> -	if (on) {
> -		val = readl(pp->elbi_base + PCIE_ELBI_SLV_ARMISC);
> -		val |= PCIE_ELBI_SLV_DBI_ENABLE;
> -		writel(val, pp->elbi_base + PCIE_ELBI_SLV_ARMISC);
> -	} else {
> -		val = readl(pp->elbi_base + PCIE_ELBI_SLV_ARMISC);
> -		val &= ~PCIE_ELBI_SLV_DBI_ENABLE;
> -		writel(val, pp->elbi_base + PCIE_ELBI_SLV_ARMISC);
> -	}
> -}
> -
> -static inline void readl_rc(struct pcie_port *pp, void *dbi_base, u32 *val)
> -{
> -	exynos_pcie_sideband_dbi_r_mode(pp, true);
> -	*val = readl(dbi_base);
> -	exynos_pcie_sideband_dbi_r_mode(pp, false);
> -	return;
> +	if (pp->ops->readl_rc)
> +		pp->ops->readl_rc(pp, dbi_addr, val);
> +	else
> +		*val = readl(dbi_addr);
>  }
>  
> -static inline void writel_rc(struct pcie_port *pp, u32 val, void *dbi_base)
> +static inline void dw_pcie_writel_rc(struct pcie_port *pp,
> +				u32 val, void __iomem *dbi_addr)
>  {
> -	exynos_pcie_sideband_dbi_w_mode(pp, true);
> -	writel(val, dbi_base);
> -	exynos_pcie_sideband_dbi_w_mode(pp, false);
> -	return;
> +	if (pp->ops->writel_rc)
> +		pp->ops->writel_rc(pp, val, dbi_addr);
> +	else
> +		writel(val, dbi_addr);
>  }
>  
> -static int exynos_pcie_rd_own_conf(struct pcie_port *pp, int where, int size,
> +int dw_pcie_rd_own_conf(struct pcie_port *pp, int where, int size,
>  				u32 *val)
>  {
>  	int ret;
>  
> -	exynos_pcie_sideband_dbi_r_mode(pp, true);
> -	ret = cfg_read(pp->dbi_base + (where & ~0x3), where, size, val);
> -	exynos_pcie_sideband_dbi_r_mode(pp, false);
> +	if (pp->ops->rd_own_conf)
> +		ret = pp->ops->rd_own_conf(pp, where, size, val);
> +	else
> +		ret = cfg_read(pp->dbi_base + (where & ~0x3), where, size, val);
> +
>  	return ret;
>  }
>  
> -static int exynos_pcie_wr_own_conf(struct pcie_port *pp, int where, int size,
> +int dw_pcie_wr_own_conf(struct pcie_port *pp, int where, int size,
>  				u32 val)
>  {
>  	int ret;
>  
> -	exynos_pcie_sideband_dbi_w_mode(pp, true);
> -	ret = cfg_write(pp->dbi_base + (where & ~0x3), where, size, val);
> -	exynos_pcie_sideband_dbi_w_mode(pp, false);
> +	if (pp->ops->wr_own_conf)
> +		ret = pp->ops->wr_own_conf(pp, where, size, val);
> +	else
> +		ret = cfg_write(pp->dbi_base + (where & ~0x3), where, size,
> +				val);
> +
>  	return ret;
>  }
>  
> -static void exynos_pcie_prog_viewport_cfg0(struct pcie_port *pp, u32 busdev)
> +int dw_pcie_link_up(struct pcie_port *pp)
> +{
> +	if (pp->ops->link_up)
> +		return pp->ops->link_up(pp);
> +	else
> +		return 0;
> +}
> +
> +int dw_pcie_host_init(struct pcie_port *pp)
> +{
> +	struct device_node *np = pp->dev->of_node;
> +	struct of_pci_range range;
> +	struct of_pci_range_parser parser;
> +	u32 val;
> +
> +	if (of_pci_range_parser_init(&parser, np)) {
> +		dev_err(pp->dev, "missing ranges property\n");
> +		return -EINVAL;
> +	}
> +
> +	/* Get the I/O and memory ranges from DT */
> +	for_each_of_pci_range(&parser, &range) {
> +		unsigned long restype = range.flags & IORESOURCE_TYPE_BITS;
> +		if (restype == IORESOURCE_IO) {
> +			of_pci_range_to_resource(&range, np, &pp->io);
> +			pp->io.name = "I/O";
> +			pp->io.start = max_t(resource_size_t,
> +					     PCIBIOS_MIN_IO,
> +					     range.pci_addr + global_io_offset);
> +			pp->io.end = min_t(resource_size_t,
> +					   IO_SPACE_LIMIT,
> +					   range.pci_addr + range.size
> +					   + global_io_offset);
> +			pp->config.io_size = resource_size(&pp->io);
> +			pp->config.io_bus_addr = range.pci_addr;
> +		}
> +		if (restype == IORESOURCE_MEM) {
> +			of_pci_range_to_resource(&range, np, &pp->mem);
> +			pp->mem.name = "MEM";
> +			pp->config.mem_size = resource_size(&pp->mem);
> +			pp->config.mem_bus_addr = range.pci_addr;
> +		}
> +		if (restype == 0) {
> +			of_pci_range_to_resource(&range, np, &pp->cfg);
> +			pp->config.cfg0_size = resource_size(&pp->cfg)/2;
> +			pp->config.cfg1_size = resource_size(&pp->cfg)/2;
> +		}
> +	}
> +
> +	pp->dbi_base = devm_ioremap(pp->dev, pp->cfg.start,
> +				resource_size(&pp->cfg));
> +	if (!pp->dbi_base) {
> +		dev_err(pp->dev, "error with ioremap\n");
> +		return -ENOMEM;
> +	}
> +
> +	pp->cfg0_base = pp->cfg.start;
> +	pp->cfg1_base = pp->cfg.start + pp->config.cfg0_size;
> +	pp->io_base = pp->io.start;
> +	pp->mem_base = pp->mem.start;
> +
> +	pp->va_cfg0_base = devm_ioremap(pp->dev, pp->cfg0_base,
> +					pp->config.cfg0_size);
> +	if (!pp->va_cfg0_base) {
> +		dev_err(pp->dev, "error with ioremap in function\n");
> +		return -ENOMEM;
> +	}
> +	pp->va_cfg1_base = devm_ioremap(pp->dev, pp->cfg1_base,
> +					pp->config.cfg1_size);
> +	if (!pp->va_cfg1_base) {
> +		dev_err(pp->dev, "error with ioremap\n");
> +		return -ENOMEM;
> +	}
> +
> +	if (pp->ops->host_init)
> +		pp->ops->host_init(pp);
> +
> +	dw_pcie_wr_own_conf(pp, PCI_BASE_ADDRESS_0, 4, 0);
> +
> +	/* program correct class for RC */
> +	dw_pcie_wr_own_conf(pp, PCI_CLASS_DEVICE, 2, PCI_CLASS_BRIDGE_PCI);
> +
> +	dw_pcie_rd_own_conf(pp, PCIE_LINK_WIDTH_SPEED_CONTROL, 4, &val);
> +	val |= PORT_LOGIC_SPEED_CHANGE;
> +	dw_pcie_wr_own_conf(pp, PCIE_LINK_WIDTH_SPEED_CONTROL, 4, val);
> +
> +	return 0;
> +}
> +
> +static void dw_pcie_prog_viewport_cfg0(struct pcie_port *pp, u32 busdev)
>  {
>  	u32 val;
>  	void __iomem *dbi_base = pp->dbi_base;
>  
>  	/* Program viewport 0 : OUTBOUND : CFG0 */
>  	val = PCIE_ATU_REGION_OUTBOUND | PCIE_ATU_REGION_INDEX0;
> -	writel_rc(pp, val, dbi_base + PCIE_ATU_VIEWPORT);
> -	writel_rc(pp, pp->cfg0_base, dbi_base + PCIE_ATU_LOWER_BASE);
> -	writel_rc(pp, (pp->cfg0_base >> 32), dbi_base + PCIE_ATU_UPPER_BASE);
> -	writel_rc(pp, pp->cfg0_base + pp->config.cfg0_size - 1,
> +	dw_pcie_writel_rc(pp, val, dbi_base + PCIE_ATU_VIEWPORT);
> +	dw_pcie_writel_rc(pp, pp->cfg0_base, dbi_base + PCIE_ATU_LOWER_BASE);
> +	dw_pcie_writel_rc(pp, (pp->cfg0_base >> 32),
> +			dbi_base + PCIE_ATU_UPPER_BASE);
> +	dw_pcie_writel_rc(pp, pp->cfg0_base + pp->config.cfg0_size - 1,
>  			dbi_base + PCIE_ATU_LIMIT);
> -	writel_rc(pp, busdev, dbi_base + PCIE_ATU_LOWER_TARGET);
> -	writel_rc(pp, 0, dbi_base + PCIE_ATU_UPPER_TARGET);
> -	writel_rc(pp, PCIE_ATU_TYPE_CFG0, dbi_base + PCIE_ATU_CR1);
> +	dw_pcie_writel_rc(pp, busdev, dbi_base + PCIE_ATU_LOWER_TARGET);
> +	dw_pcie_writel_rc(pp, 0, dbi_base + PCIE_ATU_UPPER_TARGET);
> +	dw_pcie_writel_rc(pp, PCIE_ATU_TYPE_CFG0, dbi_base + PCIE_ATU_CR1);
>  	val = PCIE_ATU_ENABLE;
> -	writel_rc(pp, val, dbi_base + PCIE_ATU_CR2);
> +	dw_pcie_writel_rc(pp, val, dbi_base + PCIE_ATU_CR2);
>  }
>  
> -static void exynos_pcie_prog_viewport_cfg1(struct pcie_port *pp, u32 busdev)
> +static void dw_pcie_prog_viewport_cfg1(struct pcie_port *pp, u32 busdev)
>  {
>  	u32 val;
>  	void __iomem *dbi_base = pp->dbi_base;
>  
>  	/* Program viewport 1 : OUTBOUND : CFG1 */
>  	val = PCIE_ATU_REGION_OUTBOUND | PCIE_ATU_REGION_INDEX1;
> -	writel_rc(pp, val, dbi_base + PCIE_ATU_VIEWPORT);
> -	writel_rc(pp, PCIE_ATU_TYPE_CFG1, dbi_base + PCIE_ATU_CR1);
> +	dw_pcie_writel_rc(pp, val, dbi_base + PCIE_ATU_VIEWPORT);
> +	dw_pcie_writel_rc(pp, PCIE_ATU_TYPE_CFG1, dbi_base + PCIE_ATU_CR1);
>  	val = PCIE_ATU_ENABLE;
> -	writel_rc(pp, val, dbi_base + PCIE_ATU_CR2);
> -	writel_rc(pp, pp->cfg1_base, dbi_base + PCIE_ATU_LOWER_BASE);
> -	writel_rc(pp, (pp->cfg1_base >> 32), dbi_base + PCIE_ATU_UPPER_BASE);
> -	writel_rc(pp, pp->cfg1_base + pp->config.cfg1_size - 1,
> +	dw_pcie_writel_rc(pp, val, dbi_base + PCIE_ATU_CR2);
> +	dw_pcie_writel_rc(pp, pp->cfg1_base, dbi_base + PCIE_ATU_LOWER_BASE);
> +	dw_pcie_writel_rc(pp, (pp->cfg1_base >> 32),
> +			dbi_base + PCIE_ATU_UPPER_BASE);
> +	dw_pcie_writel_rc(pp, pp->cfg1_base + pp->config.cfg1_size - 1,
>  			dbi_base + PCIE_ATU_LIMIT);
> -	writel_rc(pp, busdev, dbi_base + PCIE_ATU_LOWER_TARGET);
> -	writel_rc(pp, 0, dbi_base + PCIE_ATU_UPPER_TARGET);
> +	dw_pcie_writel_rc(pp, busdev, dbi_base + PCIE_ATU_LOWER_TARGET);
> +	dw_pcie_writel_rc(pp, 0, dbi_base + PCIE_ATU_UPPER_TARGET);
>  }
>  
> -static void exynos_pcie_prog_viewport_mem_outbound(struct pcie_port *pp)
> +static void dw_pcie_prog_viewport_mem_outbound(struct pcie_port *pp)
>  {
>  	u32 val;
>  	void __iomem *dbi_base = pp->dbi_base;
>  
>  	/* Program viewport 0 : OUTBOUND : MEM */
>  	val = PCIE_ATU_REGION_OUTBOUND | PCIE_ATU_REGION_INDEX0;
> -	writel_rc(pp, val, dbi_base + PCIE_ATU_VIEWPORT);
> -	writel_rc(pp, PCIE_ATU_TYPE_MEM, dbi_base + PCIE_ATU_CR1);
> +	dw_pcie_writel_rc(pp, val, dbi_base + PCIE_ATU_VIEWPORT);
> +	dw_pcie_writel_rc(pp, PCIE_ATU_TYPE_MEM, dbi_base + PCIE_ATU_CR1);
>  	val = PCIE_ATU_ENABLE;
> -	writel_rc(pp, val, dbi_base + PCIE_ATU_CR2);
> -	writel_rc(pp, pp->mem_base, dbi_base + PCIE_ATU_LOWER_BASE);
> -	writel_rc(pp, (pp->mem_base >> 32), dbi_base + PCIE_ATU_UPPER_BASE);
> -	writel_rc(pp, pp->mem_base + pp->config.mem_size - 1,
> +	dw_pcie_writel_rc(pp, val, dbi_base + PCIE_ATU_CR2);
> +	dw_pcie_writel_rc(pp, pp->mem_base, dbi_base + PCIE_ATU_LOWER_BASE);
> +	dw_pcie_writel_rc(pp, (pp->mem_base >> 32),
> +			dbi_base + PCIE_ATU_UPPER_BASE);
> +	dw_pcie_writel_rc(pp, pp->mem_base + pp->config.mem_size - 1,
>  			dbi_base + PCIE_ATU_LIMIT);
> -	writel_rc(pp, pp->config.mem_bus_addr,
> +	dw_pcie_writel_rc(pp, pp->config.mem_bus_addr,
>  			dbi_base + PCIE_ATU_LOWER_TARGET);
> -	writel_rc(pp, upper_32_bits(pp->config.mem_bus_addr),
> +	dw_pcie_writel_rc(pp, upper_32_bits(pp->config.mem_bus_addr),
>  			dbi_base + PCIE_ATU_UPPER_TARGET);
>  }
>  
> -static void exynos_pcie_prog_viewport_io_outbound(struct pcie_port *pp)
> +static void dw_pcie_prog_viewport_io_outbound(struct pcie_port *pp)
>  {
>  	u32 val;
>  	void __iomem *dbi_base = pp->dbi_base;
>  
>  	/* Program viewport 1 : OUTBOUND : IO */
>  	val = PCIE_ATU_REGION_OUTBOUND | PCIE_ATU_REGION_INDEX1;
> -	writel_rc(pp, val, dbi_base + PCIE_ATU_VIEWPORT);
> -	writel_rc(pp, PCIE_ATU_TYPE_IO, dbi_base + PCIE_ATU_CR1);
> +	dw_pcie_writel_rc(pp, val, dbi_base + PCIE_ATU_VIEWPORT);
> +	dw_pcie_writel_rc(pp, PCIE_ATU_TYPE_IO, dbi_base + PCIE_ATU_CR1);
>  	val = PCIE_ATU_ENABLE;
> -	writel_rc(pp, val, dbi_base + PCIE_ATU_CR2);
> -	writel_rc(pp, pp->io_base, dbi_base + PCIE_ATU_LOWER_BASE);
> -	writel_rc(pp, (pp->io_base >> 32), dbi_base + PCIE_ATU_UPPER_BASE);
> -	writel_rc(pp, pp->io_base + pp->config.io_size - 1,
> +	dw_pcie_writel_rc(pp, val, dbi_base + PCIE_ATU_CR2);
> +	dw_pcie_writel_rc(pp, pp->io_base, dbi_base + PCIE_ATU_LOWER_BASE);
> +	dw_pcie_writel_rc(pp, (pp->io_base >> 32),
> +			dbi_base + PCIE_ATU_UPPER_BASE);
> +	dw_pcie_writel_rc(pp, pp->io_base + pp->config.io_size - 1,
>  			dbi_base + PCIE_ATU_LIMIT);
> -	writel_rc(pp, pp->config.io_bus_addr,
> +	dw_pcie_writel_rc(pp, pp->config.io_bus_addr,
>  			dbi_base + PCIE_ATU_LOWER_TARGET);
> -	writel_rc(pp, upper_32_bits(pp->config.io_bus_addr),
> +	dw_pcie_writel_rc(pp, upper_32_bits(pp->config.io_bus_addr),
>  			dbi_base + PCIE_ATU_UPPER_TARGET);
>  }
>  
> -static int exynos_pcie_rd_other_conf(struct pcie_port *pp, struct pci_bus *bus,
> +static int dw_pcie_rd_other_conf(struct pcie_port *pp, struct pci_bus *bus,
>  		u32 devfn, int where, int size, u32 *val)
>  {
>  	int ret = PCIBIOS_SUCCESSFUL;
> @@ -357,19 +322,19 @@ static int exynos_pcie_rd_other_conf(struct pcie_port *pp, struct pci_bus *bus,
>  	address = where & ~0x3;
>  
>  	if (bus->parent->number == pp->root_bus_nr) {
> -		exynos_pcie_prog_viewport_cfg0(pp, busdev);
> +		dw_pcie_prog_viewport_cfg0(pp, busdev);
>  		ret = cfg_read(pp->va_cfg0_base + address, where, size, val);
> -		exynos_pcie_prog_viewport_mem_outbound(pp);
> +		dw_pcie_prog_viewport_mem_outbound(pp);
>  	} else {
> -		exynos_pcie_prog_viewport_cfg1(pp, busdev);
> +		dw_pcie_prog_viewport_cfg1(pp, busdev);
>  		ret = cfg_read(pp->va_cfg1_base + address, where, size, val);
> -		exynos_pcie_prog_viewport_io_outbound(pp);
> +		dw_pcie_prog_viewport_io_outbound(pp);
>  	}
>  
>  	return ret;
>  }
>  
> -static int exynos_pcie_wr_other_conf(struct pcie_port *pp, struct pci_bus *bus,
> +static int dw_pcie_wr_other_conf(struct pcie_port *pp, struct pci_bus *bus,
>  		u32 devfn, int where, int size, u32 val)
>  {
>  	int ret = PCIBIOS_SUCCESSFUL;
> @@ -380,59 +345,25 @@ static int exynos_pcie_wr_other_conf(struct pcie_port *pp, struct pci_bus *bus,
>  	address = where & ~0x3;
>  
>  	if (bus->parent->number == pp->root_bus_nr) {
> -		exynos_pcie_prog_viewport_cfg0(pp, busdev);
> +		dw_pcie_prog_viewport_cfg0(pp, busdev);
>  		ret = cfg_write(pp->va_cfg0_base + address, where, size, val);
> -		exynos_pcie_prog_viewport_mem_outbound(pp);
> +		dw_pcie_prog_viewport_mem_outbound(pp);
>  	} else {
> -		exynos_pcie_prog_viewport_cfg1(pp, busdev);
> +		dw_pcie_prog_viewport_cfg1(pp, busdev);
>  		ret = cfg_write(pp->va_cfg1_base + address, where, size, val);
> -		exynos_pcie_prog_viewport_io_outbound(pp);
> +		dw_pcie_prog_viewport_io_outbound(pp);
>  	}
>  
>  	return ret;
>  }
>  
> -static unsigned long global_io_offset;
> -
> -static int exynos_pcie_setup(int nr, struct pci_sys_data *sys)
> -{
> -	struct pcie_port *pp;
> -
> -	pp = sys_to_pcie(sys);
> -
> -	if (!pp)
> -		return 0;
> -
> -	if (global_io_offset < SZ_1M && pp->config.io_size > 0) {
> -		sys->io_offset = global_io_offset - pp->config.io_bus_addr;
> -		pci_ioremap_io(sys->io_offset, pp->io.start);
> -		global_io_offset += SZ_64K;
> -		pci_add_resource_offset(&sys->resources, &pp->io,
> -					sys->io_offset);
> -	}
> -
> -	sys->mem_offset = pp->mem.start - pp->config.mem_bus_addr;
> -	pci_add_resource_offset(&sys->resources, &pp->mem, sys->mem_offset);
> -
> -	return 1;
> -}
> -
> -static int exynos_pcie_link_up(struct pcie_port *pp)
> -{
> -	u32 val = readl(pp->elbi_base + PCIE_ELBI_RDLH_LINKUP);
> -
> -	if (val == PCIE_ELBI_LTSSM_ENABLE)
> -		return 1;
>  
> -	return 0;
> -}
> -
> -static int exynos_pcie_valid_config(struct pcie_port *pp,
> +static int dw_pcie_valid_config(struct pcie_port *pp,
>  				struct pci_bus *bus, int dev)
>  {
>  	/* If there is no link, then there is no device */
>  	if (bus->number != pp->root_bus_nr) {
> -		if (!exynos_pcie_link_up(pp))
> +		if (!dw_pcie_link_up(pp))
>  			return 0;
>  	}
>  
> @@ -450,7 +381,7 @@ static int exynos_pcie_valid_config(struct pcie_port *pp,
>  	return 1;
>  }
>  
> -static int exynos_pcie_rd_conf(struct pci_bus *bus, u32 devfn, int where,
> +static int dw_pcie_rd_conf(struct pci_bus *bus, u32 devfn, int where,
>  			int size, u32 *val)
>  {
>  	struct pcie_port *pp = sys_to_pcie(bus->sysdata);
> @@ -462,23 +393,23 @@ static int exynos_pcie_rd_conf(struct pci_bus *bus, u32 devfn, int where,
>  		return -EINVAL;
>  	}
>  
> -	if (exynos_pcie_valid_config(pp, bus, PCI_SLOT(devfn)) == 0) {
> +	if (dw_pcie_valid_config(pp, bus, PCI_SLOT(devfn)) == 0) {
>  		*val = 0xffffffff;
>  		return PCIBIOS_DEVICE_NOT_FOUND;
>  	}
>  
>  	spin_lock_irqsave(&pp->conf_lock, flags);
>  	if (bus->number != pp->root_bus_nr)
> -		ret = exynos_pcie_rd_other_conf(pp, bus, devfn,
> +		ret = dw_pcie_rd_other_conf(pp, bus, devfn,
>  						where, size, val);
>  	else
> -		ret = exynos_pcie_rd_own_conf(pp, where, size, val);
> +		ret = dw_pcie_rd_own_conf(pp, where, size, val);
>  	spin_unlock_irqrestore(&pp->conf_lock, flags);
>  
>  	return ret;
>  }
>  
> -static int exynos_pcie_wr_conf(struct pci_bus *bus, u32 devfn,
> +static int dw_pcie_wr_conf(struct pci_bus *bus, u32 devfn,
>  			int where, int size, u32 val)
>  {
>  	struct pcie_port *pp = sys_to_pcie(bus->sysdata);
> @@ -490,34 +421,56 @@ static int exynos_pcie_wr_conf(struct pci_bus *bus, u32 devfn,
>  		return -EINVAL;
>  	}
>  
> -	if (exynos_pcie_valid_config(pp, bus, PCI_SLOT(devfn)) == 0)
> +	if (dw_pcie_valid_config(pp, bus, PCI_SLOT(devfn)) == 0)
>  		return PCIBIOS_DEVICE_NOT_FOUND;
>  
>  	spin_lock_irqsave(&pp->conf_lock, flags);
>  	if (bus->number != pp->root_bus_nr)
> -		ret = exynos_pcie_wr_other_conf(pp, bus, devfn,
> +		ret = dw_pcie_wr_other_conf(pp, bus, devfn,
>  						where, size, val);
>  	else
> -		ret = exynos_pcie_wr_own_conf(pp, where, size, val);
> +		ret = dw_pcie_wr_own_conf(pp, where, size, val);
>  	spin_unlock_irqrestore(&pp->conf_lock, flags);
>  
>  	return ret;
>  }
>  
> -static struct pci_ops exynos_pcie_ops = {
> -	.read = exynos_pcie_rd_conf,
> -	.write = exynos_pcie_wr_conf,
> +static struct pci_ops dw_pcie_ops = {
> +	.read = dw_pcie_rd_conf,
> +	.write = dw_pcie_wr_conf,
>  };
>  
> -static struct pci_bus *exynos_pcie_scan_bus(int nr,
> -					struct pci_sys_data *sys)
> +int dw_pcie_setup(int nr, struct pci_sys_data *sys)
> +{
> +	struct pcie_port *pp;
> +
> +	pp = sys_to_pcie(sys);
> +
> +	if (!pp)
> +		return 0;
> +
> +	if (global_io_offset < SZ_1M && pp->config.io_size > 0) {
> +		sys->io_offset = global_io_offset - pp->config.io_bus_addr;
> +		pci_ioremap_io(sys->io_offset, pp->io.start);
> +		global_io_offset += SZ_64K;
> +		pci_add_resource_offset(&sys->resources, &pp->io,
> +					sys->io_offset);
> +	}
> +
> +	sys->mem_offset = pp->mem.start - pp->config.mem_bus_addr;
> +	pci_add_resource_offset(&sys->resources, &pp->mem, sys->mem_offset);
> +
> +	return 1;
> +}
> +
> +struct pci_bus *dw_pcie_scan_bus(int nr, struct pci_sys_data *sys)
>  {
>  	struct pci_bus *bus;
>  	struct pcie_port *pp = sys_to_pcie(sys);
>  
>  	if (pp) {
>  		pp->root_bus_nr = sys->busnr;
> -		bus = pci_scan_root_bus(NULL, sys->busnr, &exynos_pcie_ops,
> +		bus = pci_scan_root_bus(NULL, sys->busnr, &dw_pcie_ops,
>  					sys, &sys->resources);
>  	} else {
>  		bus = NULL;
> @@ -527,20 +480,20 @@ static struct pci_bus *exynos_pcie_scan_bus(int nr,
>  	return bus;
>  }
>  
> -static int exynos_pcie_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
> +int dw_pcie_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
>  {
>  	struct pcie_port *pp = sys_to_pcie(dev->bus->sysdata);
>  
>  	return pp->irq;
>  }
>  
> -static struct hw_pci exynos_pci = {
> -	.setup		= exynos_pcie_setup,
> -	.scan		= exynos_pcie_scan_bus,
> -	.map_irq	= exynos_pcie_map_irq,
> +struct hw_pci dw_pci = {
> +	.setup		= dw_pcie_setup,
> +	.scan		= dw_pcie_scan_bus,
> +	.map_irq	= dw_pcie_map_irq,
>  };
>  
> -static void exynos_pcie_setup_rc(struct pcie_port *pp)
> +void dw_pcie_setup_rc(struct pcie_port *pp)
>  {
>  	struct pcie_port_info *config = &pp->config;
>  	void __iomem *dbi_base = pp->dbi_base;
> @@ -549,509 +502,47 @@ static void exynos_pcie_setup_rc(struct pcie_port *pp)
>  	u32 memlimit;
>  
>  	/* set the number of lines as 4 */
> -	readl_rc(pp, dbi_base + PCIE_PORT_LINK_CONTROL, &val);
> +	dw_pcie_readl_rc(pp, dbi_base + PCIE_PORT_LINK_CONTROL, &val);
>  	val &= ~PORT_LINK_MODE_MASK;
>  	val |= PORT_LINK_MODE_4_LANES;
> -	writel_rc(pp, val, dbi_base + PCIE_PORT_LINK_CONTROL);
> +	dw_pcie_writel_rc(pp, val, dbi_base + PCIE_PORT_LINK_CONTROL);

I guess here we need to make this configurable. In Jacinto6 this can be either
single lane or double lane. Maybe we should have a dt property to specify the
number of lanes?
>  
>  	/* set link width speed control register */
> -	readl_rc(pp, dbi_base + PCIE_LINK_WIDTH_SPEED_CONTROL, &val);
> +	dw_pcie_readl_rc(pp, dbi_base + PCIE_LINK_WIDTH_SPEED_CONTROL, &val);
>  	val &= ~PORT_LOGIC_LINK_WIDTH_MASK;
>  	val |= PORT_LOGIC_LINK_WIDTH_4_LANES;
> -	writel_rc(pp, val, dbi_base + PCIE_LINK_WIDTH_SPEED_CONTROL);
> +	dw_pcie_writel_rc(pp, val, dbi_base + PCIE_LINK_WIDTH_SPEED_CONTROL);
>  
>  	/* setup RC BARs */
> -	writel_rc(pp, 0x00000004, dbi_base + PCI_BASE_ADDRESS_0);
> -	writel_rc(pp, 0x00000004, dbi_base + PCI_BASE_ADDRESS_1);
> +	dw_pcie_writel_rc(pp, 0x00000004, dbi_base + PCI_BASE_ADDRESS_0);
> +	dw_pcie_writel_rc(pp, 0x00000004, dbi_base + PCI_BASE_ADDRESS_1);
>  
>  	/* setup interrupt pins */
> -	readl_rc(pp, dbi_base + PCI_INTERRUPT_LINE, &val);
> +	dw_pcie_readl_rc(pp, dbi_base + PCI_INTERRUPT_LINE, &val);
>  	val &= 0xffff00ff;
>  	val |= 0x00000100;
> -	writel_rc(pp, val, dbi_base + PCI_INTERRUPT_LINE);
> +	dw_pcie_writel_rc(pp, val, dbi_base + PCI_INTERRUPT_LINE);
>  
>  	/* setup bus numbers */
> -	readl_rc(pp, dbi_base + PCI_PRIMARY_BUS, &val);
> +	dw_pcie_readl_rc(pp, dbi_base + PCI_PRIMARY_BUS, &val);
>  	val &= 0xff000000;
>  	val |= 0x00010100;
> -	writel_rc(pp, val, dbi_base + PCI_PRIMARY_BUS);
> +	dw_pcie_writel_rc(pp, val, dbi_base + PCI_PRIMARY_BUS);
>  
>  	/* setup memory base, memory limit */
>  	membase = ((u32)pp->mem_base & 0xfff00000) >> 16;
>  	memlimit = (config->mem_size + (u32)pp->mem_base) & 0xfff00000;
>  	val = memlimit | membase;
> -	writel_rc(pp, val, dbi_base + PCI_MEMORY_BASE);
> +	dw_pcie_writel_rc(pp, val, dbi_base + PCI_MEMORY_BASE);
>  
>  	/* setup command register */
> -	readl_rc(pp, dbi_base + PCI_COMMAND, &val);
> +	dw_pcie_readl_rc(pp, dbi_base + PCI_COMMAND, &val);
>  	val &= 0xffff0000;
>  	val |= PCI_COMMAND_IO | PCI_COMMAND_MEMORY |
>  		PCI_COMMAND_MASTER | PCI_COMMAND_SERR;
> -	writel_rc(pp, val, dbi_base + PCI_COMMAND);
> -}
> -
> -static void exynos_pcie_assert_core_reset(struct pcie_port *pp)
> -{
> -	u32 val;
> -	void __iomem *elbi_base = pp->elbi_base;
> -
> -	val = readl(elbi_base + PCIE_CORE_RESET);
> -	val &= ~PCIE_CORE_RESET_ENABLE;
> -	writel(val, elbi_base + PCIE_CORE_RESET);
> -	writel(0, elbi_base + PCIE_PWR_RESET);
> -	writel(0, elbi_base + PCIE_STICKY_RESET);
> -	writel(0, elbi_base + PCIE_NONSTICKY_RESET);
> -}
> -
> -static void exynos_pcie_deassert_core_reset(struct pcie_port *pp)
> -{
> -	u32 val;
> -	void __iomem *elbi_base = pp->elbi_base;
> -	void __iomem *purple_base = pp->purple_base;
> -
> -	val = readl(elbi_base + PCIE_CORE_RESET);
> -	val |= PCIE_CORE_RESET_ENABLE;
> -	writel(val, elbi_base + PCIE_CORE_RESET);
> -	writel(1, elbi_base + PCIE_STICKY_RESET);
> -	writel(1, elbi_base + PCIE_NONSTICKY_RESET);
> -	writel(1, elbi_base + PCIE_APP_INIT_RESET);
> -	writel(0, elbi_base + PCIE_APP_INIT_RESET);
> -	writel(1, purple_base + PCIE_PHY_MAC_RESET);
> -}
> -
> -static void exynos_pcie_assert_phy_reset(struct pcie_port *pp)
> -{
> -	void __iomem *purple_base = pp->purple_base;
> -
> -	writel(0, purple_base + PCIE_PHY_MAC_RESET);
> -	writel(1, purple_base + PCIE_PHY_GLOBAL_RESET);
> -}
> -
> -static void exynos_pcie_deassert_phy_reset(struct pcie_port *pp)
> -{
> -	void __iomem *elbi_base = pp->elbi_base;
> -	void __iomem *purple_base = pp->purple_base;
> -
> -	writel(0, purple_base + PCIE_PHY_GLOBAL_RESET);
> -	writel(1, elbi_base + PCIE_PWR_RESET);
> -	writel(0, purple_base + PCIE_PHY_COMMON_RESET);
> -	writel(0, purple_base + PCIE_PHY_CMN_REG);
> -	writel(0, purple_base + PCIE_PHY_TRSVREG_RESET);
> -	writel(0, purple_base + PCIE_PHY_TRSV_RESET);
> -}
> -
> -static void exynos_pcie_init_phy(struct pcie_port *pp)
> -{
> -	void __iomem *phy_base = pp->phy_base;
> -
> -	/* DCC feedback control off */
> -	writel(0x29, phy_base + PCIE_PHY_DCC_FEEDBACK);
> -
> -	/* set TX/RX impedance */
> -	writel(0xd5, phy_base + PCIE_PHY_IMPEDANCE);
> -
> -	/* set 50Mhz PHY clock */
> -	writel(0x14, phy_base + PCIE_PHY_PLL_DIV_0);
> -	writel(0x12, phy_base + PCIE_PHY_PLL_DIV_1);
> -
> -	/* set TX Differential output for lane 0 */
> -	writel(0x7f, phy_base + PCIE_PHY_TRSV0_DRV_LVL);
> -
> -	/* set TX Pre-emphasis Level Control for lane 0 to minimum */
> -	writel(0x0, phy_base + PCIE_PHY_TRSV0_EMP_LVL);
> -
> -	/* set RX clock and data recovery bandwidth */
> -	writel(0xe7, phy_base + PCIE_PHY_PLL_BIAS);
> -	writel(0x82, phy_base + PCIE_PHY_TRSV0_RXCDR);
> -	writel(0x82, phy_base + PCIE_PHY_TRSV1_RXCDR);
> -	writel(0x82, phy_base + PCIE_PHY_TRSV2_RXCDR);
> -	writel(0x82, phy_base + PCIE_PHY_TRSV3_RXCDR);
> -
> -	/* change TX Pre-emphasis Level Control for lanes */
> -	writel(0x39, phy_base + PCIE_PHY_TRSV0_EMP_LVL);
> -	writel(0x39, phy_base + PCIE_PHY_TRSV1_EMP_LVL);
> -	writel(0x39, phy_base + PCIE_PHY_TRSV2_EMP_LVL);
> -	writel(0x39, phy_base + PCIE_PHY_TRSV3_EMP_LVL);
> -
> -	/* set LVCC */
> -	writel(0x20, phy_base + PCIE_PHY_TRSV0_LVCC);
> -	writel(0xa0, phy_base + PCIE_PHY_TRSV1_LVCC);
> -	writel(0xa0, phy_base + PCIE_PHY_TRSV2_LVCC);
> -	writel(0xa0, phy_base + PCIE_PHY_TRSV3_LVCC);
> -}
> -
> -static void exynos_pcie_assert_reset(struct pcie_port *pp)
> -{
> -	if (pp->reset_gpio >= 0)
> -		devm_gpio_request_one(pp->dev, pp->reset_gpio,
> -				GPIOF_OUT_INIT_HIGH, "RESET");
> -	return;
> -}
> -
> -static int exynos_pcie_establish_link(struct pcie_port *pp)
> -{
> -	u32 val;
> -	int count = 0;
> -	void __iomem *elbi_base = pp->elbi_base;
> -	void __iomem *purple_base = pp->purple_base;
> -	void __iomem *phy_base = pp->phy_base;
> -
> -	if (exynos_pcie_link_up(pp)) {
> -		dev_err(pp->dev, "Link already up\n");
> -		return 0;
> -	}
> -
> -	/* assert reset signals */
> -	exynos_pcie_assert_core_reset(pp);
> -	exynos_pcie_assert_phy_reset(pp);
> -
> -	/* de-assert phy reset */
> -	exynos_pcie_deassert_phy_reset(pp);
> -
> -	/* initialize phy */
> -	exynos_pcie_init_phy(pp);
> -
> -	/* pulse for common reset */
> -	writel(1, purple_base + PCIE_PHY_COMMON_RESET);
> -	udelay(500);
> -	writel(0, purple_base + PCIE_PHY_COMMON_RESET);
> -
> -	/* de-assert core reset */
> -	exynos_pcie_deassert_core_reset(pp);
> -
> -	/* setup root complex */
> -	exynos_pcie_setup_rc(pp);
> -
> -	/* assert reset signal */
> -	exynos_pcie_assert_reset(pp);
> -
> -	/* assert LTSSM enable */
> -	writel(PCIE_ELBI_LTSSM_ENABLE, elbi_base + PCIE_APP_LTSSM_ENABLE);
> -
> -	/* check if the link is up or not */
> -	while (!exynos_pcie_link_up(pp)) {
> -		mdelay(100);
> -		count++;
> -		if (count == 10) {
> -			while (readl(phy_base + PCIE_PHY_PLL_LOCKED) == 0) {
> -				val = readl(purple_base + PCIE_PHY_PLL_LOCKED);
> -				dev_info(pp->dev, "PLL Locked: 0x%x\n", val);
> -			}
> -			dev_err(pp->dev, "PCIe Link Fail\n");
> -			return -EINVAL;
> -		}
> -	}
> -
> -	dev_info(pp->dev, "Link up\n");
> -
> -	return 0;
> -}
> -
> -static void exynos_pcie_clear_irq_pulse(struct pcie_port *pp)
> -{
> -	u32 val;
> -	void __iomem *elbi_base = pp->elbi_base;
> -
> -	val = readl(elbi_base + PCIE_IRQ_PULSE);
> -	writel(val, elbi_base + PCIE_IRQ_PULSE);
> -	return;
> -}
> -
> -static void exynos_pcie_enable_irq_pulse(struct pcie_port *pp)
> -{
> -	u32 val;
> -	void __iomem *elbi_base = pp->elbi_base;
> -
> -	/* enable INTX interrupt */
> -	val = IRQ_INTA_ASSERT | IRQ_INTB_ASSERT |
> -		IRQ_INTC_ASSERT | IRQ_INTD_ASSERT,
> -	writel(val, elbi_base + PCIE_IRQ_EN_PULSE);
> -	return;
> -}
> -
> -static irqreturn_t exynos_pcie_irq_handler(int irq, void *arg)
> -{
> -	struct pcie_port *pp = arg;
> -
> -	exynos_pcie_clear_irq_pulse(pp);
> -	return IRQ_HANDLED;
> -}
> -
> -static void exynos_pcie_enable_interrupts(struct pcie_port *pp)
> -{
> -	exynos_pcie_enable_irq_pulse(pp);
> -	return;
> -}
> -
> -static void exynos_pcie_host_init(struct pcie_port *pp)
> -{
> -	struct pcie_port_info *config = &pp->config;
> -	u32 val;
> -
> -	/* Keep first 64K for IO */
> -	pp->cfg0_base = pp->cfg.start;
> -	pp->cfg1_base = pp->cfg.start + config->cfg0_size;
> -	pp->io_base = pp->io.start;
> -	pp->mem_base = pp->mem.start;
> -
> -	/* enable link */
> -	exynos_pcie_establish_link(pp);
> -
> -	exynos_pcie_wr_own_conf(pp, PCI_BASE_ADDRESS_0, 4, 0);
> -
> -	/* program correct class for RC */
> -	exynos_pcie_wr_own_conf(pp, PCI_CLASS_DEVICE, 2, PCI_CLASS_BRIDGE_PCI);
> -
> -	exynos_pcie_rd_own_conf(pp, PCIE_LINK_WIDTH_SPEED_CONTROL, 4, &val);
> -	val |= PORT_LOGIC_SPEED_CHANGE;
> -	exynos_pcie_wr_own_conf(pp, PCIE_LINK_WIDTH_SPEED_CONTROL, 4, val);
> -
> -	exynos_pcie_enable_interrupts(pp);
> -}
> -
> -static int add_pcie_port(struct pcie_port *pp, struct platform_device *pdev)
> -{
> -	struct resource *elbi_base;
> -	struct resource *phy_base;
> -	struct resource *purple_base;
> -	int ret;
> -
> -	elbi_base = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> -	if (!elbi_base) {
> -		dev_err(&pdev->dev, "couldn't get elbi base resource\n");
> -		return -EINVAL;
> -	}
> -	pp->elbi_base = devm_ioremap_resource(&pdev->dev, elbi_base);
> -	if (IS_ERR(pp->elbi_base))
> -		return PTR_ERR(pp->elbi_base);
> -
> -	phy_base = platform_get_resource(pdev, IORESOURCE_MEM, 1);
> -	if (!phy_base) {
> -		dev_err(&pdev->dev, "couldn't get phy base resource\n");
> -		return -EINVAL;
> -	}
> -	pp->phy_base = devm_ioremap_resource(&pdev->dev, phy_base);
> -	if (IS_ERR(pp->phy_base))
> -		return PTR_ERR(pp->phy_base);
> -
> -	purple_base = platform_get_resource(pdev, IORESOURCE_MEM, 2);
> -	if (!purple_base) {
> -		dev_err(&pdev->dev, "couldn't get purple base resource\n");
> -		return -EINVAL;
> -	}
> -	pp->purple_base = devm_ioremap_resource(&pdev->dev, purple_base);
> -	if (IS_ERR(pp->purple_base))
> -		return PTR_ERR(pp->purple_base);
> -
> -	pp->irq = platform_get_irq(pdev, 1);
> -	if (!pp->irq) {
> -		dev_err(&pdev->dev, "failed to get irq\n");
> -		return -ENODEV;
> -	}
> -	ret = devm_request_irq(&pdev->dev, pp->irq, exynos_pcie_irq_handler,
> -				IRQF_SHARED, "exynos-pcie", pp);
> -	if (ret) {
> -		dev_err(&pdev->dev, "failed to request irq\n");
> -		return ret;
> -	}
> -
> -	pp->dbi_base = devm_ioremap(&pdev->dev, pp->cfg.start,
> -				resource_size(&pp->cfg));
> -	if (!pp->dbi_base) {
> -		dev_err(&pdev->dev, "error with ioremap\n");
> -		return -ENOMEM;
> -	}
> -
> -	pp->root_bus_nr = -1;
> -
> -	spin_lock_init(&pp->conf_lock);
> -	exynos_pcie_host_init(pp);
> -	pp->va_cfg0_base = devm_ioremap(&pdev->dev, pp->cfg0_base,
> -					pp->config.cfg0_size);
> -	if (!pp->va_cfg0_base) {
> -		dev_err(pp->dev, "error with ioremap in function\n");
> -		return -ENOMEM;
> -	}
> -	pp->va_cfg1_base = devm_ioremap(&pdev->dev, pp->cfg1_base,
> -					pp->config.cfg1_size);
> -	if (!pp->va_cfg1_base) {
> -		dev_err(pp->dev, "error with ioremap\n");
> -		return -ENOMEM;
> -	}
> -
> -	return 0;
> -}
> -
> -static int __init exynos_pcie_probe(struct platform_device *pdev)
> -{
> -	struct pcie_port *pp;
> -	struct device_node *np = pdev->dev.of_node;
> -	struct of_pci_range range;
> -	struct of_pci_range_parser parser;
> -	int ret;
> -
> -	pp = devm_kzalloc(&pdev->dev, sizeof(*pp), GFP_KERNEL);
> -	if (!pp) {
> -		dev_err(&pdev->dev, "no memory for pcie port\n");
> -		return -ENOMEM;
> -	}
> -
> -	pp->dev = &pdev->dev;
> -
> -	if (of_pci_range_parser_init(&parser, np)) {
> -		dev_err(&pdev->dev, "missing ranges property\n");
> -		return -EINVAL;
> -	}
> -
> -	/* Get the I/O and memory ranges from DT */
> -	for_each_of_pci_range(&parser, &range) {
> -		unsigned long restype = range.flags & IORESOURCE_TYPE_BITS;
> -		if (restype == IORESOURCE_IO) {
> -			of_pci_range_to_resource(&range, np, &pp->io);
> -			pp->io.name = "I/O";
> -			pp->io.start = max_t(resource_size_t,
> -					     PCIBIOS_MIN_IO,
> -					     range.pci_addr + global_io_offset);
> -			pp->io.end = min_t(resource_size_t,
> -					   IO_SPACE_LIMIT,
> -					   range.pci_addr + range.size
> -					   + global_io_offset);
> -			pp->config.io_size = resource_size(&pp->io);
> -			pp->config.io_bus_addr = range.pci_addr;
> -		}
> -		if (restype == IORESOURCE_MEM) {
> -			of_pci_range_to_resource(&range, np, &pp->mem);
> -			pp->mem.name = "MEM";
> -			pp->config.mem_size = resource_size(&pp->mem);
> -			pp->config.mem_bus_addr = range.pci_addr;
> -		}
> -		if (restype == 0) {
> -			of_pci_range_to_resource(&range, np, &pp->cfg);
> -			pp->config.cfg0_size = resource_size(&pp->cfg)/2;
> -			pp->config.cfg1_size = resource_size(&pp->cfg)/2;
> -		}
> -	}
> -
> -	pp->reset_gpio = of_get_named_gpio(np, "reset-gpio", 0);
> -
> -	pp->clk = devm_clk_get(&pdev->dev, "pcie");
> -	if (IS_ERR(pp->clk)) {
> -		dev_err(&pdev->dev, "Failed to get pcie rc clock\n");
> -		return PTR_ERR(pp->clk);
> -	}
> -	ret = clk_prepare_enable(pp->clk);
> -	if (ret)
> -		return ret;
> -
> -	pp->bus_clk = devm_clk_get(&pdev->dev, "pcie_bus");
> -	if (IS_ERR(pp->bus_clk)) {
> -		dev_err(&pdev->dev, "Failed to get pcie bus clock\n");
> -		ret = PTR_ERR(pp->bus_clk);
> -		goto fail_clk;
> -	}
> -	ret = clk_prepare_enable(pp->bus_clk);
> -	if (ret)
> -		goto fail_clk;
> -
> -	ret = add_pcie_port(pp, pdev);
> -	if (ret < 0)
> -		goto fail_bus_clk;
> -
> -	pp->controller = exynos_pci.nr_controllers;
> -	exynos_pci.nr_controllers = 1;
> -	exynos_pci.private_data = (void **)&pp;
> -
> -	pci_common_init(&exynos_pci);
> -	pci_assign_unassigned_resources();
> -#ifdef CONFIG_PCI_DOMAINS
> -	exynos_pci.domain++;
> -#endif
> -
> -	platform_set_drvdata(pdev, pp);
> -	return 0;
> -
> -fail_bus_clk:
> -	clk_disable_unprepare(pp->bus_clk);
> -fail_clk:
> -	clk_disable_unprepare(pp->clk);
> -	return ret;
> -}
> -
> -static int __exit exynos_pcie_remove(struct platform_device *pdev)
> -{
> -	struct pcie_port *pp = platform_get_drvdata(pdev);
> -
> -	clk_disable_unprepare(pp->bus_clk);
> -	clk_disable_unprepare(pp->clk);
> -
> -	return 0;
> -}
> -
> -static const struct of_device_id exynos_pcie_of_match[] = {
> -	{ .compatible = "samsung,exynos5440-pcie", },
> -	{},
> -};
> -MODULE_DEVICE_TABLE(of, exynos_pcie_of_match);
> -
> -static struct platform_driver exynos_pcie_driver = {
> -	.remove		= __exit_p(exynos_pcie_remove),
> -	.driver = {
> -		.name	= "exynos-pcie",
> -		.owner	= THIS_MODULE,
> -		.of_match_table = of_match_ptr(exynos_pcie_of_match),
> -	},
> -};
> -
> -static int exynos_pcie_abort(unsigned long addr, unsigned int fsr,
> -			struct pt_regs *regs)
> -{
> -	unsigned long pc = instruction_pointer(regs);
> -	unsigned long instr = *(unsigned long *)pc;
> -
> -	WARN_ONCE(1, "pcie abort\n");
> -
> -	/*
> -	 * If the instruction being executed was a read,
> -	 * make it look like it read all-ones.
> -	 */
> -	if ((instr & 0x0c100000) == 0x04100000) {
> -		int reg = (instr >> 12) & 15;
> -		unsigned long val;
> -
> -		if (instr & 0x00400000)
> -			val = 255;
> -		else
> -			val = -1;
> -
> -		regs->uregs[reg] = val;
> -		regs->ARM_pc += 4;
> -		return 0;
> -	}
> -
> -	if ((instr & 0x0e100090) == 0x00100090) {
> -		int reg = (instr >> 12) & 15;
> -
> -		regs->uregs[reg] = -1;
> -		regs->ARM_pc += 4;
> -		return 0;
> -	}
> -
> -	return 1;
> -}
> -
> -/* Exynos PCIe driver does not allow module unload */
> -
> -static int __init pcie_init(void)
> -{
> -	hook_fault_code(16 + 6, exynos_pcie_abort, SIGBUS, 0,
> -			"imprecise external abort");
> -
> -	platform_driver_probe(&exynos_pcie_driver, exynos_pcie_probe);
> -
> -	return 0;
> +	dw_pcie_writel_rc(pp, val, dbi_base + PCI_COMMAND);
>  }
> -subsys_initcall(pcie_init);
>  
>  MODULE_AUTHOR("Jingoo Han <[e-mail]>");
> -MODULE_DESCRIPTION("Samsung PCIe host controller driver");
> +MODULE_DESCRIPTION("Designware PCIe host controller driver");
>  MODULE_LICENSE("GPL v2");
> diff --git a/drivers/pci/host/pcie-designware.h b/drivers/pci/host/pcie-designware.h
> new file mode 100644
> index 0000000..ce3afb1
> --- /dev/null
> +++ b/drivers/pci/host/pcie-designware.h
> @@ -0,0 +1,71 @@
> +/*
> + * Synopsys Designware PCIe host controller driver
> + *
> + * Copyright (C) 2013 Samsung Electronics Co., Ltd.
> + *		http://www.samsung.com
> + *
> + * Author: Jingoo Han <[e-mail]>
> + *
> + * 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.
> + */
> +
> +struct pcie_port_info {
> +	u32		cfg0_size;
> +	u32		cfg1_size;
> +	u32		io_size;
> +	u32		mem_size;
> +	phys_addr_t	io_bus_addr;
> +	phys_addr_t	mem_bus_addr;
> +};
> +
> +struct pcie_port {
> +	struct device		*dev;
> +	u8			controller;
> +	u8			root_bus_nr;
> +	void __iomem		*dbi_base;
> +	void __iomem		*elbi_base;
> +	void __iomem		*phy_base;
> +	void __iomem		*block_base;
> +	u64			cfg0_base;
> +	void __iomem		*va_cfg0_base;
> +	u64			cfg1_base;
> +	void __iomem		*va_cfg1_base;
> +	u64			io_base;
> +	u64			mem_base;
> +	spinlock_t		conf_lock;
> +	struct resource		cfg;
> +	struct resource		io;
> +	struct resource		mem;
> +	struct pcie_port_info	config;
> +	struct clk		*clk;
> +	struct clk		*bus_clk;
> +	int			irq;
> +	int			reset_gpio;
> +	struct dw_pcie_host_ops	*ops;
> +};

I think this structure should be split. This has too many of platform specific
fields. Maybe we should make pcie_port have only fields necessary for core part
and have some other structure for platform specific part?

Something like
struct exynos_pcie {
	[...]
	void __iomem		*dbi_base;
	void __iomem		*elbi_base;
	void __iomem		*phy_base;
	int			reset_gpio;
	struct clk		*clk;
	struct clk		*bus_clk;
	[...]
	struct pcie_port	pp;
}

struct pcie_port {
	struct device		*dev;
	u64			cfg0_base;
	void __iomem		*va_cfg0_base;
	u64			cfg1_base;
	void __iomem		*va_cfg1_base;
	u64			io_base;
	u64			mem_base;
	spinlock_t		conf_lock;
	struct resource		cfg;
	struct resource		io;
	struct resource		mem;
	struct pcie_port_info	config;
	int			irq;
	struct dw_pcie_host_ops	*ops;
};

And in ops, you can use container_of to get reference to exynos_pcie (if we
want to write to exynos pcie registers)

Thanks
Kishon
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Thierry Reding July 12, 2013, 5:15 p.m. UTC | #10

On Fri, Jul 12, 2013 at 08:28:05AM +0900, Jingoo Han wrote:
> On Friday, July 12, 2013 12:41 AM, Thierry Reding wrote:
> > On Thu, Jul 11, 2013 at 02:49:43PM +0900, Jingoo Han wrote:
> > [...]
> > > diff --git a/drivers/pci/host/Makefile b/drivers/pci/host/Makefile
> > [...]
> > >  obj-$(CONFIG_PCI_MVEBU) += pci-mvebu.o
> > >  obj-$(CONFIG_PCIE_DW) += pcie-designware.o
> > > +obj-$(CONFIG_PCI_EXYNOS) += pcie-exynos.o
> > 
> > I think we should keep these sorted alphabetically. Also Tegra and
> > Marvell are PCIe controllers but they still use the pci- prefix instead
> > of pcie-. Perhaps it'd be good to keep consistency here? I initially
> > chose pci- because from a software point of view it doesn't matter all
> > that much whether it's PCI or PCIe and because the drivers are part of
> > the PCI subsystem. However if Exynos now uses the pcie- prefix it makes
> > it look like Tegra and Marvell are plain old PCI.
> > 
> 
> Hi Thierry,
> 
> I initially chose 'pci-' prefix such as 'pci-designware.c'.
> 
> However, Pratyush Anand suggested as below:
> "I would suggest to rename it as pcie-designware.c,
> because synopsis pcie and pci controllers are different."
> 
> If you have a good idea, please give it to me. :)

Alternatively the plain old PCI variant could be suffixed -legacy or
similar, but I guess pcie- as a prefix works okay in this case.

However I still think you should sort them properly:

	obj-$(CONFIG_PCIE_DW) += pcie-designware.o
	obj-$(CONFIG_PCI_EXYNOS) += pci-exynos.o
	obj-$(CONFIG_PCI_MVEBU) += pci-mvebu.o

Thierry

Thierry Reding July 12, 2013, 5:31 p.m. UTC | #11

On Fri, Jul 12, 2013 at 03:31:23PM +0530, Kishon Vijay Abraham I wrote:
> Hi,
> 
> On Thursday 11 July 2013 11:19 AM, Jingoo Han wrote:
[...]
> >  	/* set the number of lines as 4 */
> > -	readl_rc(pp, dbi_base + PCIE_PORT_LINK_CONTROL, &val);
> > +	dw_pcie_readl_rc(pp, dbi_base + PCIE_PORT_LINK_CONTROL, &val);
> >  	val &= ~PORT_LINK_MODE_MASK;
> >  	val |= PORT_LINK_MODE_4_LANES;
> > -	writel_rc(pp, val, dbi_base + PCIE_PORT_LINK_CONTROL);
> > +	dw_pcie_writel_rc(pp, val, dbi_base + PCIE_PORT_LINK_CONTROL);
> 
> I guess here we need to make this configurable. In Jacinto6 this can be either
> single lane or double lane. Maybe we should have a dt property to specify the
> number of lanes?

On Tegra we use nvidia,num-lanes to specify the lane count for each
port. Perhaps standardizing on a generic num-lanes property would make
sense? Cc'ing devicetree-discuss mailing list, maybe somebody can
provide some guidance.

Thierry

Jingoo Han July 15, 2013, 8:25 a.m. UTC | #12

On Friday, July 12, 2013 7:01 PM, Kishon Vijay Abraham I wrote:
> On Thursday 11 July 2013 11:19 AM, Jingoo Han wrote:
> > Exynos PCIe IP consists of Synopsys specific part and Exynos
> > specific part. Only core block is a Synopsys designware part;
> > other parts are Exynos specific.
> > Also, the Synopsys designware part can be shared with other
> > platforms; thus, it can be split two parts such as Synopsys
> > designware part and Exynos specific part.
> >
> > Signed-off-by: Jingoo Han <[e-mail]>
> > Cc: Pratyush Anand <[e-mail]>
> > Cc: Mohit KUMAR <[e-mail]>
> > ---
> > Changes since v1:
> > - moved the configuration, I/O, memory space handling to dw_pcie_host_init()
> > - removed exynos_pcie_abort()
> > - replaced 'purple_base' with 'block_base'
> > - replaced 'dbi_base' with 'dbi_addr'
> >
> >  drivers/pci/host/Makefile          |    1 +
> >  drivers/pci/host/pcie-designware.c |  963 +++++++++---------------------------
> >  drivers/pci/host/pcie-designware.h |   71 +++
> >  drivers/pci/host/pcie-exynos.c     |  523 ++++++++++++++++++++
> >  4 files changed, 822 insertions(+), 736 deletions(-)
> >  create mode 100644 drivers/pci/host/pcie-designware.h
> >  create mode 100644 drivers/pci/host/pcie-exynos.c
> >

[...]

> > -static void exynos_pcie_setup_rc(struct pcie_port *pp)
> > +void dw_pcie_setup_rc(struct pcie_port *pp)
> >  {
> >  	struct pcie_port_info *config = &pp->config;
> >  	void __iomem *dbi_base = pp->dbi_base;
> > @@ -549,509 +502,47 @@ static void exynos_pcie_setup_rc(struct pcie_port *pp)
> >  	u32 memlimit;
> >
> >  	/* set the number of lines as 4 */
> > -	readl_rc(pp, dbi_base + PCIE_PORT_LINK_CONTROL, &val);
> > +	dw_pcie_readl_rc(pp, dbi_base + PCIE_PORT_LINK_CONTROL, &val);
> >  	val &= ~PORT_LINK_MODE_MASK;
> >  	val |= PORT_LINK_MODE_4_LANES;
> > -	writel_rc(pp, val, dbi_base + PCIE_PORT_LINK_CONTROL);
> > +	dw_pcie_writel_rc(pp, val, dbi_base + PCIE_PORT_LINK_CONTROL);
> 
> I guess here we need to make this configurable. In Jacinto6 this can be either
> single lane or double lane. Maybe we should have a dt property to specify the
> number of lanes?

OK, I will make it configurable.

[...]

> > +struct pcie_port_info {
> > +	u32		cfg0_size;
> > +	u32		cfg1_size;
> > +	u32		io_size;
> > +	u32		mem_size;
> > +	phys_addr_t	io_bus_addr;
> > +	phys_addr_t	mem_bus_addr;
> > +};
> > +
> > +struct pcie_port {
> > +	struct device		*dev;
> > +	u8			controller;
> > +	u8			root_bus_nr;
> > +	void __iomem		*dbi_base;
> > +	void __iomem		*elbi_base;
> > +	void __iomem		*phy_base;
> > +	void __iomem		*block_base;
> > +	u64			cfg0_base;
> > +	void __iomem		*va_cfg0_base;
> > +	u64			cfg1_base;
> > +	void __iomem		*va_cfg1_base;
> > +	u64			io_base;
> > +	u64			mem_base;
> > +	spinlock_t		conf_lock;
> > +	struct resource		cfg;
> > +	struct resource		io;
> > +	struct resource		mem;
> > +	struct pcie_port_info	config;
> > +	struct clk		*clk;
> > +	struct clk		*bus_clk;
> > +	int			irq;
> > +	int			reset_gpio;
> > +	struct dw_pcie_host_ops	*ops;
> > +};
> 
> I think this structure should be split. This has too many of platform specific
> fields. Maybe we should make pcie_port have only fields necessary for core part
> and have some other structure for platform specific part?
> 
> Something like
> struct exynos_pcie {
> 	[...]
> 	void __iomem		*dbi_base;
> 	void __iomem		*elbi_base;
> 	void __iomem		*phy_base;
> 	int			reset_gpio;
> 	struct clk		*clk;
> 	struct clk		*bus_clk;
> 	[...]
> 	struct pcie_port	pp;
> }
> 
> struct pcie_port {
> 	struct device		*dev;
> 	u64			cfg0_base;
> 	void __iomem		*va_cfg0_base;
> 	u64			cfg1_base;
> 	void __iomem		*va_cfg1_base;
> 	u64			io_base;
> 	u64			mem_base;
> 	spinlock_t		conf_lock;
> 	struct resource		cfg;
> 	struct resource		io;
> 	struct resource		mem;
> 	struct pcie_port_info	config;
> 	int			irq;
> 	struct dw_pcie_host_ops	*ops;
> };
> 
> And in ops, you can use container_of to get reference to exynos_pcie (if we
> want to write to exynos pcie registers)

OK, I see.
It looks good. I will use it as you guided.
Thank you for your suggestion. :)

Best regards,
Jingoo Han


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Jingoo Han July 15, 2013, 8:26 a.m. UTC | #13

On Saturday, July 13, 2013 2:16 AM, Thierry Reding wrote:
> On Fri, Jul 12, 2013 at 08:28:05AM +0900, Jingoo Han wrote:
> > On Friday, July 12, 2013 12:41 AM, Thierry Reding wrote:
> > > On Thu, Jul 11, 2013 at 02:49:43PM +0900, Jingoo Han wrote:
> > > [...]
> > > > diff --git a/drivers/pci/host/Makefile b/drivers/pci/host/Makefile
> > > [...]
> > > >  obj-$(CONFIG_PCI_MVEBU) += pci-mvebu.o
> > > >  obj-$(CONFIG_PCIE_DW) += pcie-designware.o
> > > > +obj-$(CONFIG_PCI_EXYNOS) += pcie-exynos.o
> > >
> > > I think we should keep these sorted alphabetically. Also Tegra and
> > > Marvell are PCIe controllers but they still use the pci- prefix instead
> > > of pcie-. Perhaps it'd be good to keep consistency here? I initially
> > > chose pci- because from a software point of view it doesn't matter all
> > > that much whether it's PCI or PCIe and because the drivers are part of
> > > the PCI subsystem. However if Exynos now uses the pcie- prefix it makes
> > > it look like Tegra and Marvell are plain old PCI.
> > >
> >
> > Hi Thierry,
> >
> > I initially chose 'pci-' prefix such as 'pci-designware.c'.
> >
> > However, Pratyush Anand suggested as below:
> > "I would suggest to rename it as pcie-designware.c,
> > because synopsis pcie and pci controllers are different."
> >
> > If you have a good idea, please give it to me. :)
> 
> Alternatively the plain old PCI variant could be suffixed -legacy or
> similar, but I guess pcie- as a prefix works okay in this case.
> 
> However I still think you should sort them properly:
> 
> 	obj-$(CONFIG_PCIE_DW) += pcie-designware.o
> 	obj-$(CONFIG_PCI_EXYNOS) += pci-exynos.o
> 	obj-$(CONFIG_PCI_MVEBU) += pci-mvebu.o

Hi Thierry Reding,

Thank you for your suggestion. :)
I will use it as you guided.

Best regards,
Jingoo Han


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Patch

diff --git a/drivers/pci/host/Makefile b/drivers/pci/host/Makefile
index 086d850..7e59864 100644
--- a/drivers/pci/host/Makefile
+++ b/drivers/pci/host/Makefile
@@ -1,2 +1,3 @@ 
 obj-$(CONFIG_PCI_MVEBU) += pci-mvebu.o
 obj-$(CONFIG_PCIE_DW) += pcie-designware.o
+obj-$(CONFIG_PCI_EXYNOS) += pcie-exynos.o
diff --git a/drivers/pci/host/pcie-designware.c b/drivers/pci/host/pcie-designware.c
index 26bdbda..b372ead 100644
--- a/drivers/pci/host/pcie-designware.c
+++ b/drivers/pci/host/pcie-designware.c
@@ -1,5 +1,5 @@ 
 /*
- * PCIe host controller driver for Samsung EXYNOS SoCs
+ * Synopsys Designware PCIe host controller driver
  *
  * Copyright (C) 2013 Samsung Electronics Co., Ltd.
  *		http://www.samsung.com
@@ -11,64 +11,14 @@ 
  * published by the Free Software Foundation.
  */
 
-#include <linux/clk.h>
-#include <linux/delay.h>
-#include <linux/gpio.h>
-#include <linux/interrupt.h>
 #include <linux/kernel.h>
-#include <linux/list.h>
 #include <linux/module.h>
-#include <linux/of.h>
 #include <linux/of_address.h>
-#include <linux/of_gpio.h>
-#include <linux/of_pci.h>
 #include <linux/pci.h>
 #include <linux/pci_regs.h>
-#include <linux/platform_device.h>
-#include <linux/resource.h>
-#include <linux/signal.h>
-#include <linux/slab.h>
 #include <linux/types.h>
 
-struct pcie_port_info {
-	u32		cfg0_size;
-	u32		cfg1_size;
-	u32		io_size;
-	u32		mem_size;
-	phys_addr_t	io_bus_addr;
-	phys_addr_t	mem_bus_addr;
-};
-
-struct pcie_port {
-	struct device		*dev;
-	u8			controller;
-	u8			root_bus_nr;
-	void __iomem		*dbi_base;
-	void __iomem		*elbi_base;
-	void __iomem		*phy_base;
-	void __iomem		*purple_base;
-	u64			cfg0_base;
-	void __iomem		*va_cfg0_base;
-	u64			cfg1_base;
-	void __iomem		*va_cfg1_base;
-	u64			io_base;
-	u64			mem_base;
-	spinlock_t		conf_lock;
-	struct resource		cfg;
-	struct resource		io;
-	struct resource		mem;
-	struct pcie_port_info	config;
-	struct clk		*clk;
-	struct clk		*bus_clk;
-	int			irq;
-	int			reset_gpio;
-};
-
-/*
- * Exynos PCIe IP consists of Synopsys specific part and Exynos
- * specific part. Only core block is a Synopsys designware part;
- * other parts are Exynos specific.
- */
+#include "pcie-designware.h"
 
 /* Synopsis specific PCIE configuration registers */
 #define PCIE_PORT_LINK_CONTROL		0x710
@@ -108,69 +58,14 @@  struct pcie_port {
 #define PCIE_ATU_FUNC(x)		(((x) & 0x7) << 16)
 #define PCIE_ATU_UPPER_TARGET		0x91C
 
-/* Exynos specific PCIE configuration registers */
-
-/* PCIe ELBI registers */
-#define PCIE_IRQ_PULSE			0x000
-#define IRQ_INTA_ASSERT			(0x1 << 0)
-#define IRQ_INTB_ASSERT			(0x1 << 2)
-#define IRQ_INTC_ASSERT			(0x1 << 4)
-#define IRQ_INTD_ASSERT			(0x1 << 6)
-#define PCIE_IRQ_LEVEL			0x004
-#define PCIE_IRQ_SPECIAL		0x008
-#define PCIE_IRQ_EN_PULSE		0x00c
-#define PCIE_IRQ_EN_LEVEL		0x010
-#define PCIE_IRQ_EN_SPECIAL		0x014
-#define PCIE_PWR_RESET			0x018
-#define PCIE_CORE_RESET			0x01c
-#define PCIE_CORE_RESET_ENABLE		(0x1 << 0)
-#define PCIE_STICKY_RESET		0x020
-#define PCIE_NONSTICKY_RESET		0x024
-#define PCIE_APP_INIT_RESET		0x028
-#define PCIE_APP_LTSSM_ENABLE		0x02c
-#define PCIE_ELBI_RDLH_LINKUP		0x064
-#define PCIE_ELBI_LTSSM_ENABLE		0x1
-#define PCIE_ELBI_SLV_AWMISC		0x11c
-#define PCIE_ELBI_SLV_ARMISC		0x120
-#define PCIE_ELBI_SLV_DBI_ENABLE	(0x1 << 21)
-
-/* PCIe Purple registers */
-#define PCIE_PHY_GLOBAL_RESET		0x000
-#define PCIE_PHY_COMMON_RESET		0x004
-#define PCIE_PHY_CMN_REG		0x008
-#define PCIE_PHY_MAC_RESET		0x00c
-#define PCIE_PHY_PLL_LOCKED		0x010
-#define PCIE_PHY_TRSVREG_RESET		0x020
-#define PCIE_PHY_TRSV_RESET		0x024
-
-/* PCIe PHY registers */
-#define PCIE_PHY_IMPEDANCE		0x004
-#define PCIE_PHY_PLL_DIV_0		0x008
-#define PCIE_PHY_PLL_BIAS		0x00c
-#define PCIE_PHY_DCC_FEEDBACK		0x014
-#define PCIE_PHY_PLL_DIV_1		0x05c
-#define PCIE_PHY_TRSV0_EMP_LVL		0x084
-#define PCIE_PHY_TRSV0_DRV_LVL		0x088
-#define PCIE_PHY_TRSV0_RXCDR		0x0ac
-#define PCIE_PHY_TRSV0_LVCC		0x0dc
-#define PCIE_PHY_TRSV1_EMP_LVL		0x144
-#define PCIE_PHY_TRSV1_RXCDR		0x16c
-#define PCIE_PHY_TRSV1_LVCC		0x19c
-#define PCIE_PHY_TRSV2_EMP_LVL		0x204
-#define PCIE_PHY_TRSV2_RXCDR		0x22c
-#define PCIE_PHY_TRSV2_LVCC		0x25c
-#define PCIE_PHY_TRSV3_EMP_LVL		0x2c4
-#define PCIE_PHY_TRSV3_RXCDR		0x2ec
-#define PCIE_PHY_TRSV3_LVCC		0x31c
-
-static struct hw_pci exynos_pci;
+unsigned long global_io_offset;
 
 static inline struct pcie_port *sys_to_pcie(struct pci_sys_data *sys)
 {
 	return sys->private_data;
 }
 
-static inline int cfg_read(void *addr, int where, int size, u32 *val)
+int cfg_read(void *addr, int where, int size, u32 *val)
 {
 	*val = readl(addr);
 
@@ -184,7 +79,7 @@  static inline int cfg_read(void *addr, int where, int size, u32 *val)
 	return PCIBIOS_SUCCESSFUL;
 }
 
-static inline int cfg_write(void *addr, int where, int size, u32 val)
+int cfg_write(void *addr, int where, int size, u32 val)
 {
 	if (size == 4)
 		writel(val, addr);
@@ -198,155 +93,225 @@  static inline int cfg_write(void *addr, int where, int size, u32 val)
 	return PCIBIOS_SUCCESSFUL;
 }
 
-static void exynos_pcie_sideband_dbi_w_mode(struct pcie_port *pp, bool on)
-{
-	u32 val;
-
-	if (on) {
-		val = readl(pp->elbi_base + PCIE_ELBI_SLV_AWMISC);
-		val |= PCIE_ELBI_SLV_DBI_ENABLE;
-		writel(val, pp->elbi_base + PCIE_ELBI_SLV_AWMISC);
-	} else {
-		val = readl(pp->elbi_base + PCIE_ELBI_SLV_AWMISC);
-		val &= ~PCIE_ELBI_SLV_DBI_ENABLE;
-		writel(val, pp->elbi_base + PCIE_ELBI_SLV_AWMISC);
-	}
-}
-
-static void exynos_pcie_sideband_dbi_r_mode(struct pcie_port *pp, bool on)
+static inline void dw_pcie_readl_rc(struct pcie_port *pp,
+				void __iomem *dbi_addr, u32 *val)
 {
-	u32 val;
-
-	if (on) {
-		val = readl(pp->elbi_base + PCIE_ELBI_SLV_ARMISC);
-		val |= PCIE_ELBI_SLV_DBI_ENABLE;
-		writel(val, pp->elbi_base + PCIE_ELBI_SLV_ARMISC);
-	} else {
-		val = readl(pp->elbi_base + PCIE_ELBI_SLV_ARMISC);
-		val &= ~PCIE_ELBI_SLV_DBI_ENABLE;
-		writel(val, pp->elbi_base + PCIE_ELBI_SLV_ARMISC);
-	}
-}
-
-static inline void readl_rc(struct pcie_port *pp, void *dbi_base, u32 *val)
-{
-	exynos_pcie_sideband_dbi_r_mode(pp, true);
-	*val = readl(dbi_base);
-	exynos_pcie_sideband_dbi_r_mode(pp, false);
-	return;
+	if (pp->ops->readl_rc)
+		pp->ops->readl_rc(pp, dbi_addr, val);
+	else
+		*val = readl(dbi_addr);
 }
 
-static inline void writel_rc(struct pcie_port *pp, u32 val, void *dbi_base)
+static inline void dw_pcie_writel_rc(struct pcie_port *pp,
+				u32 val, void __iomem *dbi_addr)
 {
-	exynos_pcie_sideband_dbi_w_mode(pp, true);
-	writel(val, dbi_base);
-	exynos_pcie_sideband_dbi_w_mode(pp, false);
-	return;
+	if (pp->ops->writel_rc)
+		pp->ops->writel_rc(pp, val, dbi_addr);
+	else
+		writel(val, dbi_addr);
 }
 
-static int exynos_pcie_rd_own_conf(struct pcie_port *pp, int where, int size,
+int dw_pcie_rd_own_conf(struct pcie_port *pp, int where, int size,
 				u32 *val)
 {
 	int ret;
 
-	exynos_pcie_sideband_dbi_r_mode(pp, true);
-	ret = cfg_read(pp->dbi_base + (where & ~0x3), where, size, val);
-	exynos_pcie_sideband_dbi_r_mode(pp, false);
+	if (pp->ops->rd_own_conf)
+		ret = pp->ops->rd_own_conf(pp, where, size, val);
+	else
+		ret = cfg_read(pp->dbi_base + (where & ~0x3), where, size, val);
+
 	return ret;
 }
 
-static int exynos_pcie_wr_own_conf(struct pcie_port *pp, int where, int size,
+int dw_pcie_wr_own_conf(struct pcie_port *pp, int where, int size,
 				u32 val)
 {
 	int ret;
 
-	exynos_pcie_sideband_dbi_w_mode(pp, true);
-	ret = cfg_write(pp->dbi_base + (where & ~0x3), where, size, val);
-	exynos_pcie_sideband_dbi_w_mode(pp, false);
+	if (pp->ops->wr_own_conf)
+		ret = pp->ops->wr_own_conf(pp, where, size, val);
+	else
+		ret = cfg_write(pp->dbi_base + (where & ~0x3), where, size,
+				val);
+
 	return ret;
 }
 
-static void exynos_pcie_prog_viewport_cfg0(struct pcie_port *pp, u32 busdev)
+int dw_pcie_link_up(struct pcie_port *pp)
+{
+	if (pp->ops->link_up)
+		return pp->ops->link_up(pp);
+	else
+		return 0;
+}
+
+int dw_pcie_host_init(struct pcie_port *pp)
+{
+	struct device_node *np = pp->dev->of_node;
+	struct of_pci_range range;
+	struct of_pci_range_parser parser;
+	u32 val;
+
+	if (of_pci_range_parser_init(&parser, np)) {
+		dev_err(pp->dev, "missing ranges property\n");
+		return -EINVAL;
+	}
+
+	/* Get the I/O and memory ranges from DT */
+	for_each_of_pci_range(&parser, &range) {
+		unsigned long restype = range.flags & IORESOURCE_TYPE_BITS;
+		if (restype == IORESOURCE_IO) {
+			of_pci_range_to_resource(&range, np, &pp->io);
+			pp->io.name = "I/O";
+			pp->io.start = max_t(resource_size_t,
+					     PCIBIOS_MIN_IO,
+					     range.pci_addr + global_io_offset);
+			pp->io.end = min_t(resource_size_t,
+					   IO_SPACE_LIMIT,
+					   range.pci_addr + range.size
+					   + global_io_offset);
+			pp->config.io_size = resource_size(&pp->io);
+			pp->config.io_bus_addr = range.pci_addr;
+		}
+		if (restype == IORESOURCE_MEM) {
+			of_pci_range_to_resource(&range, np, &pp->mem);
+			pp->mem.name = "MEM";
+			pp->config.mem_size = resource_size(&pp->mem);
+			pp->config.mem_bus_addr = range.pci_addr;
+		}
+		if (restype == 0) {
+			of_pci_range_to_resource(&range, np, &pp->cfg);
+			pp->config.cfg0_size = resource_size(&pp->cfg)/2;
+			pp->config.cfg1_size = resource_size(&pp->cfg)/2;
+		}
+	}
+
+	pp->dbi_base = devm_ioremap(pp->dev, pp->cfg.start,
+				resource_size(&pp->cfg));
+	if (!pp->dbi_base) {
+		dev_err(pp->dev, "error with ioremap\n");
+		return -ENOMEM;
+	}
+
+	pp->cfg0_base = pp->cfg.start;
+	pp->cfg1_base = pp->cfg.start + pp->config.cfg0_size;
+	pp->io_base = pp->io.start;
+	pp->mem_base = pp->mem.start;
+
+	pp->va_cfg0_base = devm_ioremap(pp->dev, pp->cfg0_base,
+					pp->config.cfg0_size);
+	if (!pp->va_cfg0_base) {
+		dev_err(pp->dev, "error with ioremap in function\n");
+		return -ENOMEM;
+	}
+	pp->va_cfg1_base = devm_ioremap(pp->dev, pp->cfg1_base,
+					pp->config.cfg1_size);
+	if (!pp->va_cfg1_base) {
+		dev_err(pp->dev, "error with ioremap\n");
+		return -ENOMEM;
+	}
+
+	if (pp->ops->host_init)
+		pp->ops->host_init(pp);
+
+	dw_pcie_wr_own_conf(pp, PCI_BASE_ADDRESS_0, 4, 0);
+
+	/* program correct class for RC */
+	dw_pcie_wr_own_conf(pp, PCI_CLASS_DEVICE, 2, PCI_CLASS_BRIDGE_PCI);
+
+	dw_pcie_rd_own_conf(pp, PCIE_LINK_WIDTH_SPEED_CONTROL, 4, &val);
+	val |= PORT_LOGIC_SPEED_CHANGE;
+	dw_pcie_wr_own_conf(pp, PCIE_LINK_WIDTH_SPEED_CONTROL, 4, val);
+
+	return 0;
+}
+
+static void dw_pcie_prog_viewport_cfg0(struct pcie_port *pp, u32 busdev)
 {
 	u32 val;
 	void __iomem *dbi_base = pp->dbi_base;
 
 	/* Program viewport 0 : OUTBOUND : CFG0 */
 	val = PCIE_ATU_REGION_OUTBOUND | PCIE_ATU_REGION_INDEX0;
-	writel_rc(pp, val, dbi_base + PCIE_ATU_VIEWPORT);
-	writel_rc(pp, pp->cfg0_base, dbi_base + PCIE_ATU_LOWER_BASE);
-	writel_rc(pp, (pp->cfg0_base >> 32), dbi_base + PCIE_ATU_UPPER_BASE);
-	writel_rc(pp, pp->cfg0_base + pp->config.cfg0_size - 1,
+	dw_pcie_writel_rc(pp, val, dbi_base + PCIE_ATU_VIEWPORT);
+	dw_pcie_writel_rc(pp, pp->cfg0_base, dbi_base + PCIE_ATU_LOWER_BASE);
+	dw_pcie_writel_rc(pp, (pp->cfg0_base >> 32),
+			dbi_base + PCIE_ATU_UPPER_BASE);
+	dw_pcie_writel_rc(pp, pp->cfg0_base + pp->config.cfg0_size - 1,
 			dbi_base + PCIE_ATU_LIMIT);
-	writel_rc(pp, busdev, dbi_base + PCIE_ATU_LOWER_TARGET);
-	writel_rc(pp, 0, dbi_base + PCIE_ATU_UPPER_TARGET);
-	writel_rc(pp, PCIE_ATU_TYPE_CFG0, dbi_base + PCIE_ATU_CR1);
+	dw_pcie_writel_rc(pp, busdev, dbi_base + PCIE_ATU_LOWER_TARGET);
+	dw_pcie_writel_rc(pp, 0, dbi_base + PCIE_ATU_UPPER_TARGET);
+	dw_pcie_writel_rc(pp, PCIE_ATU_TYPE_CFG0, dbi_base + PCIE_ATU_CR1);
 	val = PCIE_ATU_ENABLE;
-	writel_rc(pp, val, dbi_base + PCIE_ATU_CR2);
+	dw_pcie_writel_rc(pp, val, dbi_base + PCIE_ATU_CR2);
 }
 
-static void exynos_pcie_prog_viewport_cfg1(struct pcie_port *pp, u32 busdev)
+static void dw_pcie_prog_viewport_cfg1(struct pcie_port *pp, u32 busdev)
 {
 	u32 val;
 	void __iomem *dbi_base = pp->dbi_base;
 
 	/* Program viewport 1 : OUTBOUND : CFG1 */
 	val = PCIE_ATU_REGION_OUTBOUND | PCIE_ATU_REGION_INDEX1;
-	writel_rc(pp, val, dbi_base + PCIE_ATU_VIEWPORT);
-	writel_rc(pp, PCIE_ATU_TYPE_CFG1, dbi_base + PCIE_ATU_CR1);
+	dw_pcie_writel_rc(pp, val, dbi_base + PCIE_ATU_VIEWPORT);
+	dw_pcie_writel_rc(pp, PCIE_ATU_TYPE_CFG1, dbi_base + PCIE_ATU_CR1);
 	val = PCIE_ATU_ENABLE;
-	writel_rc(pp, val, dbi_base + PCIE_ATU_CR2);
-	writel_rc(pp, pp->cfg1_base, dbi_base + PCIE_ATU_LOWER_BASE);
-	writel_rc(pp, (pp->cfg1_base >> 32), dbi_base + PCIE_ATU_UPPER_BASE);
-	writel_rc(pp, pp->cfg1_base + pp->config.cfg1_size - 1,
+	dw_pcie_writel_rc(pp, val, dbi_base + PCIE_ATU_CR2);
+	dw_pcie_writel_rc(pp, pp->cfg1_base, dbi_base + PCIE_ATU_LOWER_BASE);
+	dw_pcie_writel_rc(pp, (pp->cfg1_base >> 32),
+			dbi_base + PCIE_ATU_UPPER_BASE);
+	dw_pcie_writel_rc(pp, pp->cfg1_base + pp->config.cfg1_size - 1,
 			dbi_base + PCIE_ATU_LIMIT);
-	writel_rc(pp, busdev, dbi_base + PCIE_ATU_LOWER_TARGET);
-	writel_rc(pp, 0, dbi_base + PCIE_ATU_UPPER_TARGET);
+	dw_pcie_writel_rc(pp, busdev, dbi_base + PCIE_ATU_LOWER_TARGET);
+	dw_pcie_writel_rc(pp, 0, dbi_base + PCIE_ATU_UPPER_TARGET);
 }
 
-static void exynos_pcie_prog_viewport_mem_outbound(struct pcie_port *pp)
+static void dw_pcie_prog_viewport_mem_outbound(struct pcie_port *pp)
 {
 	u32 val;
 	void __iomem *dbi_base = pp->dbi_base;
 
 	/* Program viewport 0 : OUTBOUND : MEM */
 	val = PCIE_ATU_REGION_OUTBOUND | PCIE_ATU_REGION_INDEX0;
-	writel_rc(pp, val, dbi_base + PCIE_ATU_VIEWPORT);
-	writel_rc(pp, PCIE_ATU_TYPE_MEM, dbi_base + PCIE_ATU_CR1);
+	dw_pcie_writel_rc(pp, val, dbi_base + PCIE_ATU_VIEWPORT);
+	dw_pcie_writel_rc(pp, PCIE_ATU_TYPE_MEM, dbi_base + PCIE_ATU_CR1);
 	val = PCIE_ATU_ENABLE;
-	writel_rc(pp, val, dbi_base + PCIE_ATU_CR2);
-	writel_rc(pp, pp->mem_base, dbi_base + PCIE_ATU_LOWER_BASE);
-	writel_rc(pp, (pp->mem_base >> 32), dbi_base + PCIE_ATU_UPPER_BASE);
-	writel_rc(pp, pp->mem_base + pp->config.mem_size - 1,
+	dw_pcie_writel_rc(pp, val, dbi_base + PCIE_ATU_CR2);
+	dw_pcie_writel_rc(pp, pp->mem_base, dbi_base + PCIE_ATU_LOWER_BASE);
+	dw_pcie_writel_rc(pp, (pp->mem_base >> 32),
+			dbi_base + PCIE_ATU_UPPER_BASE);
+	dw_pcie_writel_rc(pp, pp->mem_base + pp->config.mem_size - 1,
 			dbi_base + PCIE_ATU_LIMIT);
-	writel_rc(pp, pp->config.mem_bus_addr,
+	dw_pcie_writel_rc(pp, pp->config.mem_bus_addr,
 			dbi_base + PCIE_ATU_LOWER_TARGET);
-	writel_rc(pp, upper_32_bits(pp->config.mem_bus_addr),
+	dw_pcie_writel_rc(pp, upper_32_bits(pp->config.mem_bus_addr),
 			dbi_base + PCIE_ATU_UPPER_TARGET);
 }
 
-static void exynos_pcie_prog_viewport_io_outbound(struct pcie_port *pp)
+static void dw_pcie_prog_viewport_io_outbound(struct pcie_port *pp)
 {
 	u32 val;
 	void __iomem *dbi_base = pp->dbi_base;
 
 	/* Program viewport 1 : OUTBOUND : IO */
 	val = PCIE_ATU_REGION_OUTBOUND | PCIE_ATU_REGION_INDEX1;
-	writel_rc(pp, val, dbi_base + PCIE_ATU_VIEWPORT);
-	writel_rc(pp, PCIE_ATU_TYPE_IO, dbi_base + PCIE_ATU_CR1);
+	dw_pcie_writel_rc(pp, val, dbi_base + PCIE_ATU_VIEWPORT);
+	dw_pcie_writel_rc(pp, PCIE_ATU_TYPE_IO, dbi_base + PCIE_ATU_CR1);
 	val = PCIE_ATU_ENABLE;
-	writel_rc(pp, val, dbi_base + PCIE_ATU_CR2);
-	writel_rc(pp, pp->io_base, dbi_base + PCIE_ATU_LOWER_BASE);
-	writel_rc(pp, (pp->io_base >> 32), dbi_base + PCIE_ATU_UPPER_BASE);
-	writel_rc(pp, pp->io_base + pp->config.io_size - 1,
+	dw_pcie_writel_rc(pp, val, dbi_base + PCIE_ATU_CR2);
+	dw_pcie_writel_rc(pp, pp->io_base, dbi_base + PCIE_ATU_LOWER_BASE);
+	dw_pcie_writel_rc(pp, (pp->io_base >> 32),
+			dbi_base + PCIE_ATU_UPPER_BASE);
+	dw_pcie_writel_rc(pp, pp->io_base + pp->config.io_size - 1,
 			dbi_base + PCIE_ATU_LIMIT);
-	writel_rc(pp, pp->config.io_bus_addr,
+	dw_pcie_writel_rc(pp, pp->config.io_bus_addr,
 			dbi_base + PCIE_ATU_LOWER_TARGET);
-	writel_rc(pp, upper_32_bits(pp->config.io_bus_addr),
+	dw_pcie_writel_rc(pp, upper_32_bits(pp->config.io_bus_addr),
 			dbi_base + PCIE_ATU_UPPER_TARGET);
 }
 
-static int exynos_pcie_rd_other_conf(struct pcie_port *pp, struct pci_bus *bus,
+static int dw_pcie_rd_other_conf(struct pcie_port *pp, struct pci_bus *bus,
 		u32 devfn, int where, int size, u32 *val)
 {
 	int ret = PCIBIOS_SUCCESSFUL;
@@ -357,19 +322,19 @@  static int exynos_pcie_rd_other_conf(struct pcie_port *pp, struct pci_bus *bus,
 	address = where & ~0x3;
 
 	if (bus->parent->number == pp->root_bus_nr) {
-		exynos_pcie_prog_viewport_cfg0(pp, busdev);
+		dw_pcie_prog_viewport_cfg0(pp, busdev);
 		ret = cfg_read(pp->va_cfg0_base + address, where, size, val);
-		exynos_pcie_prog_viewport_mem_outbound(pp);
+		dw_pcie_prog_viewport_mem_outbound(pp);
 	} else {
-		exynos_pcie_prog_viewport_cfg1(pp, busdev);
+		dw_pcie_prog_viewport_cfg1(pp, busdev);
 		ret = cfg_read(pp->va_cfg1_base + address, where, size, val);
-		exynos_pcie_prog_viewport_io_outbound(pp);
+		dw_pcie_prog_viewport_io_outbound(pp);
 	}
 
 	return ret;
 }
 
-static int exynos_pcie_wr_other_conf(struct pcie_port *pp, struct pci_bus *bus,
+static int dw_pcie_wr_other_conf(struct pcie_port *pp, struct pci_bus *bus,
 		u32 devfn, int where, int size, u32 val)
 {
 	int ret = PCIBIOS_SUCCESSFUL;
@@ -380,59 +345,25 @@  static int exynos_pcie_wr_other_conf(struct pcie_port *pp, struct pci_bus *bus,
 	address = where & ~0x3;
 
 	if (bus->parent->number == pp->root_bus_nr) {
-		exynos_pcie_prog_viewport_cfg0(pp, busdev);
+		dw_pcie_prog_viewport_cfg0(pp, busdev);
 		ret = cfg_write(pp->va_cfg0_base + address, where, size, val);
-		exynos_pcie_prog_viewport_mem_outbound(pp);
+		dw_pcie_prog_viewport_mem_outbound(pp);
 	} else {
-		exynos_pcie_prog_viewport_cfg1(pp, busdev);
+		dw_pcie_prog_viewport_cfg1(pp, busdev);
 		ret = cfg_write(pp->va_cfg1_base + address, where, size, val);
-		exynos_pcie_prog_viewport_io_outbound(pp);
+		dw_pcie_prog_viewport_io_outbound(pp);
 	}
 
 	return ret;
 }
 
-static unsigned long global_io_offset;
-
-static int exynos_pcie_setup(int nr, struct pci_sys_data *sys)
-{
-	struct pcie_port *pp;
-
-	pp = sys_to_pcie(sys);
-
-	if (!pp)
-		return 0;
-
-	if (global_io_offset < SZ_1M && pp->config.io_size > 0) {
-		sys->io_offset = global_io_offset - pp->config.io_bus_addr;
-		pci_ioremap_io(sys->io_offset, pp->io.start);
-		global_io_offset += SZ_64K;
-		pci_add_resource_offset(&sys->resources, &pp->io,
-					sys->io_offset);
-	}
-
-	sys->mem_offset = pp->mem.start - pp->config.mem_bus_addr;
-	pci_add_resource_offset(&sys->resources, &pp->mem, sys->mem_offset);
-
-	return 1;
-}
-
-static int exynos_pcie_link_up(struct pcie_port *pp)
-{
-	u32 val = readl(pp->elbi_base + PCIE_ELBI_RDLH_LINKUP);
-
-	if (val == PCIE_ELBI_LTSSM_ENABLE)
-		return 1;
 
-	return 0;
-}
-
-static int exynos_pcie_valid_config(struct pcie_port *pp,
+static int dw_pcie_valid_config(struct pcie_port *pp,
 				struct pci_bus *bus, int dev)
 {
 	/* If there is no link, then there is no device */
 	if (bus->number != pp->root_bus_nr) {
-		if (!exynos_pcie_link_up(pp))
+		if (!dw_pcie_link_up(pp))
 			return 0;
 	}
 
@@ -450,7 +381,7 @@  static int exynos_pcie_valid_config(struct pcie_port *pp,
 	return 1;
 }
 
-static int exynos_pcie_rd_conf(struct pci_bus *bus, u32 devfn, int where,
+static int dw_pcie_rd_conf(struct pci_bus *bus, u32 devfn, int where,
 			int size, u32 *val)
 {
 	struct pcie_port *pp = sys_to_pcie(bus->sysdata);
@@ -462,23 +393,23 @@  static int exynos_pcie_rd_conf(struct pci_bus *bus, u32 devfn, int where,
 		return -EINVAL;
 	}
 
-	if (exynos_pcie_valid_config(pp, bus, PCI_SLOT(devfn)) == 0) {
+	if (dw_pcie_valid_config(pp, bus, PCI_SLOT(devfn)) == 0) {
 		*val = 0xffffffff;
 		return PCIBIOS_DEVICE_NOT_FOUND;
 	}
 
 	spin_lock_irqsave(&pp->conf_lock, flags);
 	if (bus->number != pp->root_bus_nr)
-		ret = exynos_pcie_rd_other_conf(pp, bus, devfn,
+		ret = dw_pcie_rd_other_conf(pp, bus, devfn,
 						where, size, val);
 	else
-		ret = exynos_pcie_rd_own_conf(pp, where, size, val);
+		ret = dw_pcie_rd_own_conf(pp, where, size, val);
 	spin_unlock_irqrestore(&pp->conf_lock, flags);
 
 	return ret;
 }
 
-static int exynos_pcie_wr_conf(struct pci_bus *bus, u32 devfn,
+static int dw_pcie_wr_conf(struct pci_bus *bus, u32 devfn,
 			int where, int size, u32 val)
 {
 	struct pcie_port *pp = sys_to_pcie(bus->sysdata);
@@ -490,34 +421,56 @@  static int exynos_pcie_wr_conf(struct pci_bus *bus, u32 devfn,
 		return -EINVAL;
 	}
 
-	if (exynos_pcie_valid_config(pp, bus, PCI_SLOT(devfn)) == 0)
+	if (dw_pcie_valid_config(pp, bus, PCI_SLOT(devfn)) == 0)
 		return PCIBIOS_DEVICE_NOT_FOUND;
 
 	spin_lock_irqsave(&pp->conf_lock, flags);
 	if (bus->number != pp->root_bus_nr)
-		ret = exynos_pcie_wr_other_conf(pp, bus, devfn,
+		ret = dw_pcie_wr_other_conf(pp, bus, devfn,
 						where, size, val);
 	else
-		ret = exynos_pcie_wr_own_conf(pp, where, size, val);
+		ret = dw_pcie_wr_own_conf(pp, where, size, val);
 	spin_unlock_irqrestore(&pp->conf_lock, flags);
 
 	return ret;
 }
 
-static struct pci_ops exynos_pcie_ops = {
-	.read = exynos_pcie_rd_conf,
-	.write = exynos_pcie_wr_conf,
+static struct pci_ops dw_pcie_ops = {
+	.read = dw_pcie_rd_conf,
+	.write = dw_pcie_wr_conf,
 };
 
-static struct pci_bus *exynos_pcie_scan_bus(int nr,
-					struct pci_sys_data *sys)
+int dw_pcie_setup(int nr, struct pci_sys_data *sys)
+{
+	struct pcie_port *pp;
+
+	pp = sys_to_pcie(sys);
+
+	if (!pp)
+		return 0;
+
+	if (global_io_offset < SZ_1M && pp->config.io_size > 0) {
+		sys->io_offset = global_io_offset - pp->config.io_bus_addr;
+		pci_ioremap_io(sys->io_offset, pp->io.start);
+		global_io_offset += SZ_64K;
+		pci_add_resource_offset(&sys->resources, &pp->io,
+					sys->io_offset);
+	}
+
+	sys->mem_offset = pp->mem.start - pp->config.mem_bus_addr;
+	pci_add_resource_offset(&sys->resources, &pp->mem, sys->mem_offset);
+
+	return 1;
+}
+
+struct pci_bus *dw_pcie_scan_bus(int nr, struct pci_sys_data *sys)
 {
 	struct pci_bus *bus;
 	struct pcie_port *pp = sys_to_pcie(sys);
 
 	if (pp) {
 		pp->root_bus_nr = sys->busnr;
-		bus = pci_scan_root_bus(NULL, sys->busnr, &exynos_pcie_ops,
+		bus = pci_scan_root_bus(NULL, sys->busnr, &dw_pcie_ops,
 					sys, &sys->resources);
 	} else {
 		bus = NULL;
@@ -527,20 +480,20 @@  static struct pci_bus *exynos_pcie_scan_bus(int nr,
 	return bus;
 }
 
-static int exynos_pcie_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
+int dw_pcie_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
 {
 	struct pcie_port *pp = sys_to_pcie(dev->bus->sysdata);
 
 	return pp->irq;
 }
 
-static struct hw_pci exynos_pci = {
-	.setup		= exynos_pcie_setup,
-	.scan		= exynos_pcie_scan_bus,
-	.map_irq	= exynos_pcie_map_irq,
+struct hw_pci dw_pci = {
+	.setup		= dw_pcie_setup,
+	.scan		= dw_pcie_scan_bus,
+	.map_irq	= dw_pcie_map_irq,
 };
 
-static void exynos_pcie_setup_rc(struct pcie_port *pp)
+void dw_pcie_setup_rc(struct pcie_port *pp)
 {
 	struct pcie_port_info *config = &pp->config;
 	void __iomem *dbi_base = pp->dbi_base;
@@ -549,509 +502,47 @@  static void exynos_pcie_setup_rc(struct pcie_port *pp)
 	u32 memlimit;
 
 	/* set the number of lines as 4 */
-	readl_rc(pp, dbi_base + PCIE_PORT_LINK_CONTROL, &val);
+	dw_pcie_readl_rc(pp, dbi_base + PCIE_PORT_LINK_CONTROL, &val);
 	val &= ~PORT_LINK_MODE_MASK;
 	val |= PORT_LINK_MODE_4_LANES;
-	writel_rc(pp, val, dbi_base + PCIE_PORT_LINK_CONTROL);
+	dw_pcie_writel_rc(pp, val, dbi_base + PCIE_PORT_LINK_CONTROL);
 
 	/* set link width speed control register */
-	readl_rc(pp, dbi_base + PCIE_LINK_WIDTH_SPEED_CONTROL, &val);
+	dw_pcie_readl_rc(pp, dbi_base + PCIE_LINK_WIDTH_SPEED_CONTROL, &val);
 	val &= ~PORT_LOGIC_LINK_WIDTH_MASK;
 	val |= PORT_LOGIC_LINK_WIDTH_4_LANES;
-	writel_rc(pp, val, dbi_base + PCIE_LINK_WIDTH_SPEED_CONTROL);
+	dw_pcie_writel_rc(pp, val, dbi_base + PCIE_LINK_WIDTH_SPEED_CONTROL);
 
 	/* setup RC BARs */
-	writel_rc(pp, 0x00000004, dbi_base + PCI_BASE_ADDRESS_0);
-	writel_rc(pp, 0x00000004, dbi_base + PCI_BASE_ADDRESS_1);
+	dw_pcie_writel_rc(pp, 0x00000004, dbi_base + PCI_BASE_ADDRESS_0);
+	dw_pcie_writel_rc(pp, 0x00000004, dbi_base + PCI_BASE_ADDRESS_1);
 
 	/* setup interrupt pins */
-	readl_rc(pp, dbi_base + PCI_INTERRUPT_LINE, &val);
+	dw_pcie_readl_rc(pp, dbi_base + PCI_INTERRUPT_LINE, &val);
 	val &= 0xffff00ff;
 	val |= 0x00000100;
-	writel_rc(pp, val, dbi_base + PCI_INTERRUPT_LINE);
+	dw_pcie_writel_rc(pp, val, dbi_base + PCI_INTERRUPT_LINE);
 
 	/* setup bus numbers */
-	readl_rc(pp, dbi_base + PCI_PRIMARY_BUS, &val);
+	dw_pcie_readl_rc(pp, dbi_base + PCI_PRIMARY_BUS, &val);
 	val &= 0xff000000;
 	val |= 0x00010100;
-	writel_rc(pp, val, dbi_base + PCI_PRIMARY_BUS);
+	dw_pcie_writel_rc(pp, val, dbi_base + PCI_PRIMARY_BUS);
 
 	/* setup memory base, memory limit */
 	membase = ((u32)pp->mem_base & 0xfff00000) >> 16;
 	memlimit = (config->mem_size + (u32)pp->mem_base) & 0xfff00000;
 	val = memlimit | membase;
-	writel_rc(pp, val, dbi_base + PCI_MEMORY_BASE);
+	dw_pcie_writel_rc(pp, val, dbi_base + PCI_MEMORY_BASE);
 
 	/* setup command register */
-	readl_rc(pp, dbi_base + PCI_COMMAND, &val);
+	dw_pcie_readl_rc(pp, dbi_base + PCI_COMMAND, &val);
 	val &= 0xffff0000;
 	val |= PCI_COMMAND_IO | PCI_COMMAND_MEMORY |
 		PCI_COMMAND_MASTER | PCI_COMMAND_SERR;
-	writel_rc(pp, val, dbi_base + PCI_COMMAND);
-}
-
-static void exynos_pcie_assert_core_reset(struct pcie_port *pp)
-{
-	u32 val;
-	void __iomem *elbi_base = pp->elbi_base;
-
-	val = readl(elbi_base + PCIE_CORE_RESET);
-	val &= ~PCIE_CORE_RESET_ENABLE;
-	writel(val, elbi_base + PCIE_CORE_RESET);
-	writel(0, elbi_base + PCIE_PWR_RESET);
-	writel(0, elbi_base + PCIE_STICKY_RESET);
-	writel(0, elbi_base + PCIE_NONSTICKY_RESET);
-}
-
-static void exynos_pcie_deassert_core_reset(struct pcie_port *pp)
-{
-	u32 val;
-	void __iomem *elbi_base = pp->elbi_base;
-	void __iomem *purple_base = pp->purple_base;
-
-	val = readl(elbi_base + PCIE_CORE_RESET);
-	val |= PCIE_CORE_RESET_ENABLE;
-	writel(val, elbi_base + PCIE_CORE_RESET);
-	writel(1, elbi_base + PCIE_STICKY_RESET);
-	writel(1, elbi_base + PCIE_NONSTICKY_RESET);
-	writel(1, elbi_base + PCIE_APP_INIT_RESET);
-	writel(0, elbi_base + PCIE_APP_INIT_RESET);
-	writel(1, purple_base + PCIE_PHY_MAC_RESET);
-}
-
-static void exynos_pcie_assert_phy_reset(struct pcie_port *pp)
-{
-	void __iomem *purple_base = pp->purple_base;
-
-	writel(0, purple_base + PCIE_PHY_MAC_RESET);
-	writel(1, purple_base + PCIE_PHY_GLOBAL_RESET);
-}
-
-static void exynos_pcie_deassert_phy_reset(struct pcie_port *pp)
-{
-	void __iomem *elbi_base = pp->elbi_base;
-	void __iomem *purple_base = pp->purple_base;
-
-	writel(0, purple_base + PCIE_PHY_GLOBAL_RESET);
-	writel(1, elbi_base + PCIE_PWR_RESET);
-	writel(0, purple_base + PCIE_PHY_COMMON_RESET);
-	writel(0, purple_base + PCIE_PHY_CMN_REG);
-	writel(0, purple_base + PCIE_PHY_TRSVREG_RESET);
-	writel(0, purple_base + PCIE_PHY_TRSV_RESET);
-}
-
-static void exynos_pcie_init_phy(struct pcie_port *pp)
-{
-	void __iomem *phy_base = pp->phy_base;
-
-	/* DCC feedback control off */
-	writel(0x29, phy_base + PCIE_PHY_DCC_FEEDBACK);
-
-	/* set TX/RX impedance */
-	writel(0xd5, phy_base + PCIE_PHY_IMPEDANCE);
-
-	/* set 50Mhz PHY clock */
-	writel(0x14, phy_base + PCIE_PHY_PLL_DIV_0);
-	writel(0x12, phy_base + PCIE_PHY_PLL_DIV_1);
-
-	/* set TX Differential output for lane 0 */
-	writel(0x7f, phy_base + PCIE_PHY_TRSV0_DRV_LVL);
-
-	/* set TX Pre-emphasis Level Control for lane 0 to minimum */
-	writel(0x0, phy_base + PCIE_PHY_TRSV0_EMP_LVL);
-
-	/* set RX clock and data recovery bandwidth */
-	writel(0xe7, phy_base + PCIE_PHY_PLL_BIAS);
-	writel(0x82, phy_base + PCIE_PHY_TRSV0_RXCDR);
-	writel(0x82, phy_base + PCIE_PHY_TRSV1_RXCDR);
-	writel(0x82, phy_base + PCIE_PHY_TRSV2_RXCDR);
-	writel(0x82, phy_base + PCIE_PHY_TRSV3_RXCDR);
-
-	/* change TX Pre-emphasis Level Control for lanes */
-	writel(0x39, phy_base + PCIE_PHY_TRSV0_EMP_LVL);
-	writel(0x39, phy_base + PCIE_PHY_TRSV1_EMP_LVL);
-	writel(0x39, phy_base + PCIE_PHY_TRSV2_EMP_LVL);
-	writel(0x39, phy_base + PCIE_PHY_TRSV3_EMP_LVL);
-
-	/* set LVCC */
-	writel(0x20, phy_base + PCIE_PHY_TRSV0_LVCC);
-	writel(0xa0, phy_base + PCIE_PHY_TRSV1_LVCC);
-	writel(0xa0, phy_base + PCIE_PHY_TRSV2_LVCC);
-	writel(0xa0, phy_base + PCIE_PHY_TRSV3_LVCC);
-}
-
-static void exynos_pcie_assert_reset(struct pcie_port *pp)
-{
-	if (pp->reset_gpio >= 0)
-		devm_gpio_request_one(pp->dev, pp->reset_gpio,
-				GPIOF_OUT_INIT_HIGH, "RESET");
-	return;
-}
-
-static int exynos_pcie_establish_link(struct pcie_port *pp)
-{
-	u32 val;
-	int count = 0;
-	void __iomem *elbi_base = pp->elbi_base;
-	void __iomem *purple_base = pp->purple_base;
-	void __iomem *phy_base = pp->phy_base;
-
-	if (exynos_pcie_link_up(pp)) {
-		dev_err(pp->dev, "Link already up\n");
-		return 0;
-	}
-
-	/* assert reset signals */
-	exynos_pcie_assert_core_reset(pp);
-	exynos_pcie_assert_phy_reset(pp);
-
-	/* de-assert phy reset */
-	exynos_pcie_deassert_phy_reset(pp);
-
-	/* initialize phy */
-	exynos_pcie_init_phy(pp);
-
-	/* pulse for common reset */
-	writel(1, purple_base + PCIE_PHY_COMMON_RESET);
-	udelay(500);
-	writel(0, purple_base + PCIE_PHY_COMMON_RESET);
-
-	/* de-assert core reset */
-	exynos_pcie_deassert_core_reset(pp);
-
-	/* setup root complex */
-	exynos_pcie_setup_rc(pp);
-
-	/* assert reset signal */
-	exynos_pcie_assert_reset(pp);
-
-	/* assert LTSSM enable */
-	writel(PCIE_ELBI_LTSSM_ENABLE, elbi_base + PCIE_APP_LTSSM_ENABLE);
-
-	/* check if the link is up or not */
-	while (!exynos_pcie_link_up(pp)) {
-		mdelay(100);
-		count++;
-		if (count == 10) {
-			while (readl(phy_base + PCIE_PHY_PLL_LOCKED) == 0) {
-				val = readl(purple_base + PCIE_PHY_PLL_LOCKED);
-				dev_info(pp->dev, "PLL Locked: 0x%x\n", val);
-			}
-			dev_err(pp->dev, "PCIe Link Fail\n");
-			return -EINVAL;
-		}
-	}
-
-	dev_info(pp->dev, "Link up\n");
-
-	return 0;
-}
-
-static void exynos_pcie_clear_irq_pulse(struct pcie_port *pp)
-{
-	u32 val;
-	void __iomem *elbi_base = pp->elbi_base;
-
-	val = readl(elbi_base + PCIE_IRQ_PULSE);
-	writel(val, elbi_base + PCIE_IRQ_PULSE);
-	return;
-}
-
-static void exynos_pcie_enable_irq_pulse(struct pcie_port *pp)
-{
-	u32 val;
-	void __iomem *elbi_base = pp->elbi_base;
-
-	/* enable INTX interrupt */
-	val = IRQ_INTA_ASSERT | IRQ_INTB_ASSERT |
-		IRQ_INTC_ASSERT | IRQ_INTD_ASSERT,
-	writel(val, elbi_base + PCIE_IRQ_EN_PULSE);
-	return;
-}
-
-static irqreturn_t exynos_pcie_irq_handler(int irq, void *arg)
-{
-	struct pcie_port *pp = arg;
-
-	exynos_pcie_clear_irq_pulse(pp);
-	return IRQ_HANDLED;
-}
-
-static void exynos_pcie_enable_interrupts(struct pcie_port *pp)
-{
-	exynos_pcie_enable_irq_pulse(pp);
-	return;
-}
-
-static void exynos_pcie_host_init(struct pcie_port *pp)
-{
-	struct pcie_port_info *config = &pp->config;
-	u32 val;
-
-	/* Keep first 64K for IO */
-	pp->cfg0_base = pp->cfg.start;
-	pp->cfg1_base = pp->cfg.start + config->cfg0_size;
-	pp->io_base = pp->io.start;
-	pp->mem_base = pp->mem.start;
-
-	/* enable link */
-	exynos_pcie_establish_link(pp);
-
-	exynos_pcie_wr_own_conf(pp, PCI_BASE_ADDRESS_0, 4, 0);
-
-	/* program correct class for RC */
-	exynos_pcie_wr_own_conf(pp, PCI_CLASS_DEVICE, 2, PCI_CLASS_BRIDGE_PCI);
-
-	exynos_pcie_rd_own_conf(pp, PCIE_LINK_WIDTH_SPEED_CONTROL, 4, &val);
-	val |= PORT_LOGIC_SPEED_CHANGE;
-	exynos_pcie_wr_own_conf(pp, PCIE_LINK_WIDTH_SPEED_CONTROL, 4, val);
-
-	exynos_pcie_enable_interrupts(pp);
-}
-
-static int add_pcie_port(struct pcie_port *pp, struct platform_device *pdev)
-{
-	struct resource *elbi_base;
-	struct resource *phy_base;
-	struct resource *purple_base;
-	int ret;
-
-	elbi_base = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (!elbi_base) {
-		dev_err(&pdev->dev, "couldn't get elbi base resource\n");
-		return -EINVAL;
-	}
-	pp->elbi_base = devm_ioremap_resource(&pdev->dev, elbi_base);
-	if (IS_ERR(pp->elbi_base))
-		return PTR_ERR(pp->elbi_base);
-
-	phy_base = platform_get_resource(pdev, IORESOURCE_MEM, 1);
-	if (!phy_base) {
-		dev_err(&pdev->dev, "couldn't get phy base resource\n");
-		return -EINVAL;
-	}
-	pp->phy_base = devm_ioremap_resource(&pdev->dev, phy_base);
-	if (IS_ERR(pp->phy_base))
-		return PTR_ERR(pp->phy_base);
-
-	purple_base = platform_get_resource(pdev, IORESOURCE_MEM, 2);
-	if (!purple_base) {
-		dev_err(&pdev->dev, "couldn't get purple base resource\n");
-		return -EINVAL;
-	}
-	pp->purple_base = devm_ioremap_resource(&pdev->dev, purple_base);
-	if (IS_ERR(pp->purple_base))
-		return PTR_ERR(pp->purple_base);
-
-	pp->irq = platform_get_irq(pdev, 1);
-	if (!pp->irq) {
-		dev_err(&pdev->dev, "failed to get irq\n");
-		return -ENODEV;
-	}
-	ret = devm_request_irq(&pdev->dev, pp->irq, exynos_pcie_irq_handler,
-				IRQF_SHARED, "exynos-pcie", pp);
-	if (ret) {
-		dev_err(&pdev->dev, "failed to request irq\n");
-		return ret;
-	}
-
-	pp->dbi_base = devm_ioremap(&pdev->dev, pp->cfg.start,
-				resource_size(&pp->cfg));
-	if (!pp->dbi_base) {
-		dev_err(&pdev->dev, "error with ioremap\n");
-		return -ENOMEM;
-	}
-
-	pp->root_bus_nr = -1;
-
-	spin_lock_init(&pp->conf_lock);
-	exynos_pcie_host_init(pp);
-	pp->va_cfg0_base = devm_ioremap(&pdev->dev, pp->cfg0_base,
-					pp->config.cfg0_size);
-	if (!pp->va_cfg0_base) {
-		dev_err(pp->dev, "error with ioremap in function\n");
-		return -ENOMEM;
-	}
-	pp->va_cfg1_base = devm_ioremap(&pdev->dev, pp->cfg1_base,
-					pp->config.cfg1_size);
-	if (!pp->va_cfg1_base) {
-		dev_err(pp->dev, "error with ioremap\n");
-		return -ENOMEM;
-	}
-
-	return 0;
-}
-
-static int __init exynos_pcie_probe(struct platform_device *pdev)
-{
-	struct pcie_port *pp;
-	struct device_node *np = pdev->dev.of_node;
-	struct of_pci_range range;
-	struct of_pci_range_parser parser;
-	int ret;
-
-	pp = devm_kzalloc(&pdev->dev, sizeof(*pp), GFP_KERNEL);
-	if (!pp) {
-		dev_err(&pdev->dev, "no memory for pcie port\n");
-		return -ENOMEM;
-	}
-
-	pp->dev = &pdev->dev;
-
-	if (of_pci_range_parser_init(&parser, np)) {
-		dev_err(&pdev->dev, "missing ranges property\n");
-		return -EINVAL;
-	}
-
-	/* Get the I/O and memory ranges from DT */
-	for_each_of_pci_range(&parser, &range) {
-		unsigned long restype = range.flags & IORESOURCE_TYPE_BITS;
-		if (restype == IORESOURCE_IO) {
-			of_pci_range_to_resource(&range, np, &pp->io);
-			pp->io.name = "I/O";
-			pp->io.start = max_t(resource_size_t,
-					     PCIBIOS_MIN_IO,
-					     range.pci_addr + global_io_offset);
-			pp->io.end = min_t(resource_size_t,
-					   IO_SPACE_LIMIT,
-					   range.pci_addr + range.size
-					   + global_io_offset);
-			pp->config.io_size = resource_size(&pp->io);
-			pp->config.io_bus_addr = range.pci_addr;
-		}
-		if (restype == IORESOURCE_MEM) {
-			of_pci_range_to_resource(&range, np, &pp->mem);
-			pp->mem.name = "MEM";
-			pp->config.mem_size = resource_size(&pp->mem);
-			pp->config.mem_bus_addr = range.pci_addr;
-		}
-		if (restype == 0) {
-			of_pci_range_to_resource(&range, np, &pp->cfg);
-			pp->config.cfg0_size = resource_size(&pp->cfg)/2;
-			pp->config.cfg1_size = resource_size(&pp->cfg)/2;
-		}
-	}
-
-	pp->reset_gpio = of_get_named_gpio(np, "reset-gpio", 0);
-
-	pp->clk = devm_clk_get(&pdev->dev, "pcie");
-	if (IS_ERR(pp->clk)) {
-		dev_err(&pdev->dev, "Failed to get pcie rc clock\n");
-		return PTR_ERR(pp->clk);
-	}
-	ret = clk_prepare_enable(pp->clk);
-	if (ret)
-		return ret;
-
-	pp->bus_clk = devm_clk_get(&pdev->dev, "pcie_bus");
-	if (IS_ERR(pp->bus_clk)) {
-		dev_err(&pdev->dev, "Failed to get pcie bus clock\n");
-		ret = PTR_ERR(pp->bus_clk);
-		goto fail_clk;
-	}
-	ret = clk_prepare_enable(pp->bus_clk);
-	if (ret)
-		goto fail_clk;
-
-	ret = add_pcie_port(pp, pdev);
-	if (ret < 0)
-		goto fail_bus_clk;
-
-	pp->controller = exynos_pci.nr_controllers;
-	exynos_pci.nr_controllers = 1;
-	exynos_pci.private_data = (void **)&pp;
-
-	pci_common_init(&exynos_pci);
-	pci_assign_unassigned_resources();
-#ifdef CONFIG_PCI_DOMAINS
-	exynos_pci.domain++;
-#endif
-
-	platform_set_drvdata(pdev, pp);
-	return 0;
-
-fail_bus_clk:
-	clk_disable_unprepare(pp->bus_clk);
-fail_clk:
-	clk_disable_unprepare(pp->clk);
-	return ret;
-}
-
-static int __exit exynos_pcie_remove(struct platform_device *pdev)
-{
-	struct pcie_port *pp = platform_get_drvdata(pdev);
-
-	clk_disable_unprepare(pp->bus_clk);
-	clk_disable_unprepare(pp->clk);
-
-	return 0;
-}
-
-static const struct of_device_id exynos_pcie_of_match[] = {
-	{ .compatible = "samsung,exynos5440-pcie", },
-	{},
-};
-MODULE_DEVICE_TABLE(of, exynos_pcie_of_match);
-
-static struct platform_driver exynos_pcie_driver = {
-	.remove		= __exit_p(exynos_pcie_remove),
-	.driver = {
-		.name	= "exynos-pcie",
-		.owner	= THIS_MODULE,
-		.of_match_table = of_match_ptr(exynos_pcie_of_match),
-	},
-};
-
-static int exynos_pcie_abort(unsigned long addr, unsigned int fsr,
-			struct pt_regs *regs)
-{
-	unsigned long pc = instruction_pointer(regs);
-	unsigned long instr = *(unsigned long *)pc;
-
-	WARN_ONCE(1, "pcie abort\n");
-
-	/*
-	 * If the instruction being executed was a read,
-	 * make it look like it read all-ones.
-	 */
-	if ((instr & 0x0c100000) == 0x04100000) {
-		int reg = (instr >> 12) & 15;
-		unsigned long val;
-
-		if (instr & 0x00400000)
-			val = 255;
-		else
-			val = -1;
-
-		regs->uregs[reg] = val;
-		regs->ARM_pc += 4;
-		return 0;
-	}
-
-	if ((instr & 0x0e100090) == 0x00100090) {
-		int reg = (instr >> 12) & 15;
-
-		regs->uregs[reg] = -1;
-		regs->ARM_pc += 4;
-		return 0;
-	}
-
-	return 1;
-}
-
-/* Exynos PCIe driver does not allow module unload */
-
-static int __init pcie_init(void)
-{
-	hook_fault_code(16 + 6, exynos_pcie_abort, SIGBUS, 0,
-			"imprecise external abort");
-
-	platform_driver_probe(&exynos_pcie_driver, exynos_pcie_probe);
-
-	return 0;
+	dw_pcie_writel_rc(pp, val, dbi_base + PCI_COMMAND);
 }
-subsys_initcall(pcie_init);
 
 MODULE_AUTHOR("Jingoo Han <[e-mail]>");
-MODULE_DESCRIPTION("Samsung PCIe host controller driver");
+MODULE_DESCRIPTION("Designware PCIe host controller driver");
 MODULE_LICENSE("GPL v2");
diff --git a/drivers/pci/host/pcie-designware.h b/drivers/pci/host/pcie-designware.h
new file mode 100644
index 0000000..ce3afb1
--- /dev/null
+++ b/drivers/pci/host/pcie-designware.h
@@ -0,0 +1,71 @@ 
+/*
+ * Synopsys Designware PCIe host controller driver
+ *
+ * Copyright (C) 2013 Samsung Electronics Co., Ltd.
+ *		http://www.samsung.com
+ *
+ * Author: Jingoo Han <[e-mail]>
+ *
+ * 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.
+ */
+
+struct pcie_port_info {
+	u32		cfg0_size;
+	u32		cfg1_size;
+	u32		io_size;
+	u32		mem_size;
+	phys_addr_t	io_bus_addr;
+	phys_addr_t	mem_bus_addr;
+};
+
+struct pcie_port {
+	struct device		*dev;
+	u8			controller;
+	u8			root_bus_nr;
+	void __iomem		*dbi_base;
+	void __iomem		*elbi_base;
+	void __iomem		*phy_base;
+	void __iomem		*block_base;
+	u64			cfg0_base;
+	void __iomem		*va_cfg0_base;
+	u64			cfg1_base;
+	void __iomem		*va_cfg1_base;
+	u64			io_base;
+	u64			mem_base;
+	spinlock_t		conf_lock;
+	struct resource		cfg;
+	struct resource		io;
+	struct resource		mem;
+	struct pcie_port_info	config;
+	struct clk		*clk;
+	struct clk		*bus_clk;
+	int			irq;
+	int			reset_gpio;
+	struct dw_pcie_host_ops	*ops;
+};
+
+struct dw_pcie_host_ops {
+	void (*readl_rc)(struct pcie_port *pp, void *dbi_base, u32 *val);
+	void (*writel_rc)(struct pcie_port *pp, u32 val, void *dbi_base);
+	int (*rd_own_conf)(struct pcie_port *pp, int where, int size, u32 *val);
+	int (*wr_own_conf)(struct pcie_port *pp, int where, int size, u32 val);
+	int (*link_up)(struct pcie_port *pp);
+	void (*host_init)(struct pcie_port *pp);
+};
+
+extern struct hw_pci dw_pci;
+
+extern unsigned long global_io_offset;
+
+int cfg_read(void *addr, int where, int size, u32 *val);
+int cfg_write(void *addr, int where, int size, u32 val);
+int dw_pcie_wr_own_conf(struct pcie_port *pp, int where, int size, u32 val);
+int dw_pcie_rd_own_conf(struct pcie_port *pp, int where, int size, u32 *val);
+int dw_pcie_link_up(struct pcie_port *pp);
+void dw_pcie_setup_rc(struct pcie_port *pp);
+int dw_pcie_host_init(struct pcie_port *pp);
+int dw_pcie_setup(int nr, struct pci_sys_data *sys);
+struct pci_bus *dw_pcie_scan_bus(int nr, struct pci_sys_data *sys);
+int dw_pcie_map_irq(const struct pci_dev *dev, u8 slot, u8 pin);
diff --git a/drivers/pci/host/pcie-exynos.c b/drivers/pci/host/pcie-exynos.c
new file mode 100644
index 0000000..e318770
--- /dev/null
+++ b/drivers/pci/host/pcie-exynos.c
@@ -0,0 +1,523 @@ 
+/*
+ * PCIe host controller driver for Samsung EXYNOS SoCs
+ *
+ * Copyright (C) 2013 Samsung Electronics Co., Ltd.
+ *		http://www.samsung.com
+ *
+ * Author: Jingoo Han <[e-mail]>
+ *
+ * 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/clk.h>
+#include <linux/delay.h>
+#include <linux/gpio.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of_gpio.h>
+#include <linux/pci.h>
+#include <linux/platform_device.h>
+#include <linux/resource.h>
+#include <linux/signal.h>
+#include <linux/types.h>
+
+#include "pcie-designware.h"
+
+/* PCIe ELBI registers */
+#define PCIE_IRQ_PULSE			0x000
+#define IRQ_INTA_ASSERT			(0x1 << 0)
+#define IRQ_INTB_ASSERT			(0x1 << 2)
+#define IRQ_INTC_ASSERT			(0x1 << 4)
+#define IRQ_INTD_ASSERT			(0x1 << 6)
+#define PCIE_IRQ_LEVEL			0x004
+#define PCIE_IRQ_SPECIAL		0x008
+#define PCIE_IRQ_EN_PULSE		0x00c
+#define PCIE_IRQ_EN_LEVEL		0x010
+#define PCIE_IRQ_EN_SPECIAL		0x014
+#define PCIE_PWR_RESET			0x018
+#define PCIE_CORE_RESET			0x01c
+#define PCIE_CORE_RESET_ENABLE		(0x1 << 0)
+#define PCIE_STICKY_RESET		0x020
+#define PCIE_NONSTICKY_RESET		0x024
+#define PCIE_APP_INIT_RESET		0x028
+#define PCIE_APP_LTSSM_ENABLE		0x02c
+#define PCIE_ELBI_RDLH_LINKUP		0x064
+#define PCIE_ELBI_LTSSM_ENABLE		0x1
+#define PCIE_ELBI_SLV_AWMISC		0x11c
+#define PCIE_ELBI_SLV_ARMISC		0x120
+#define PCIE_ELBI_SLV_DBI_ENABLE	(0x1 << 21)
+
+/* PCIe Purple registers */
+#define PCIE_PHY_GLOBAL_RESET		0x000
+#define PCIE_PHY_COMMON_RESET		0x004
+#define PCIE_PHY_CMN_REG		0x008
+#define PCIE_PHY_MAC_RESET		0x00c
+#define PCIE_PHY_PLL_LOCKED		0x010
+#define PCIE_PHY_TRSVREG_RESET		0x020
+#define PCIE_PHY_TRSV_RESET		0x024
+
+/* PCIe PHY registers */
+#define PCIE_PHY_IMPEDANCE		0x004
+#define PCIE_PHY_PLL_DIV_0		0x008
+#define PCIE_PHY_PLL_BIAS		0x00c
+#define PCIE_PHY_DCC_FEEDBACK		0x014
+#define PCIE_PHY_PLL_DIV_1		0x05c
+#define PCIE_PHY_TRSV0_EMP_LVL		0x084
+#define PCIE_PHY_TRSV0_DRV_LVL		0x088
+#define PCIE_PHY_TRSV0_RXCDR		0x0ac
+#define PCIE_PHY_TRSV0_LVCC		0x0dc
+#define PCIE_PHY_TRSV1_EMP_LVL		0x144
+#define PCIE_PHY_TRSV1_RXCDR		0x16c
+#define PCIE_PHY_TRSV1_LVCC		0x19c
+#define PCIE_PHY_TRSV2_EMP_LVL		0x204
+#define PCIE_PHY_TRSV2_RXCDR		0x22c
+#define PCIE_PHY_TRSV2_LVCC		0x25c
+#define PCIE_PHY_TRSV3_EMP_LVL		0x2c4
+#define PCIE_PHY_TRSV3_RXCDR		0x2ec
+#define PCIE_PHY_TRSV3_LVCC		0x31c
+
+static void exynos_pcie_sideband_dbi_w_mode(struct pcie_port *pp, bool on)
+{
+	u32 val;
+
+	if (on) {
+		val = readl(pp->elbi_base + PCIE_ELBI_SLV_AWMISC);
+		val |= PCIE_ELBI_SLV_DBI_ENABLE;
+		writel(val, pp->elbi_base + PCIE_ELBI_SLV_AWMISC);
+	} else {
+		val = readl(pp->elbi_base + PCIE_ELBI_SLV_AWMISC);
+		val &= ~PCIE_ELBI_SLV_DBI_ENABLE;
+		writel(val, pp->elbi_base + PCIE_ELBI_SLV_AWMISC);
+	}
+}
+
+static void exynos_pcie_sideband_dbi_r_mode(struct pcie_port *pp, bool on)
+{
+	u32 val;
+
+	if (on) {
+		val = readl(pp->elbi_base + PCIE_ELBI_SLV_ARMISC);
+		val |= PCIE_ELBI_SLV_DBI_ENABLE;
+		writel(val, pp->elbi_base + PCIE_ELBI_SLV_ARMISC);
+	} else {
+		val = readl(pp->elbi_base + PCIE_ELBI_SLV_ARMISC);
+		val &= ~PCIE_ELBI_SLV_DBI_ENABLE;
+		writel(val, pp->elbi_base + PCIE_ELBI_SLV_ARMISC);
+	}
+}
+
+static void exynos_pcie_assert_core_reset(struct pcie_port *pp)
+{
+	u32 val;
+	void __iomem *elbi_base = pp->elbi_base;
+
+	val = readl(elbi_base + PCIE_CORE_RESET);
+	val &= ~PCIE_CORE_RESET_ENABLE;
+	writel(val, elbi_base + PCIE_CORE_RESET);
+	writel(0, elbi_base + PCIE_PWR_RESET);
+	writel(0, elbi_base + PCIE_STICKY_RESET);
+	writel(0, elbi_base + PCIE_NONSTICKY_RESET);
+}
+
+static void exynos_pcie_deassert_core_reset(struct pcie_port *pp)
+{
+	u32 val;
+	void __iomem *elbi_base = pp->elbi_base;
+	void __iomem *block_base = pp->block_base;
+
+	val = readl(elbi_base + PCIE_CORE_RESET);
+	val |= PCIE_CORE_RESET_ENABLE;
+	writel(val, elbi_base + PCIE_CORE_RESET);
+	writel(1, elbi_base + PCIE_STICKY_RESET);
+	writel(1, elbi_base + PCIE_NONSTICKY_RESET);
+	writel(1, elbi_base + PCIE_APP_INIT_RESET);
+	writel(0, elbi_base + PCIE_APP_INIT_RESET);
+	writel(1, block_base + PCIE_PHY_MAC_RESET);
+}
+
+static void exynos_pcie_assert_phy_reset(struct pcie_port *pp)
+{
+	void __iomem *block_base = pp->block_base;
+
+	writel(0, block_base + PCIE_PHY_MAC_RESET);
+	writel(1, block_base + PCIE_PHY_GLOBAL_RESET);
+}
+
+static void exynos_pcie_deassert_phy_reset(struct pcie_port *pp)
+{
+	void __iomem *elbi_base = pp->elbi_base;
+	void __iomem *block_base = pp->block_base;
+
+	writel(0, block_base + PCIE_PHY_GLOBAL_RESET);
+	writel(1, elbi_base + PCIE_PWR_RESET);
+	writel(0, block_base + PCIE_PHY_COMMON_RESET);
+	writel(0, block_base + PCIE_PHY_CMN_REG);
+	writel(0, block_base + PCIE_PHY_TRSVREG_RESET);
+	writel(0, block_base + PCIE_PHY_TRSV_RESET);
+}
+
+static void exynos_pcie_init_phy(struct pcie_port *pp)
+{
+	void __iomem *phy_base = pp->phy_base;
+
+	/* DCC feedback control off */
+	writel(0x29, phy_base + PCIE_PHY_DCC_FEEDBACK);
+
+	/* set TX/RX impedance */
+	writel(0xd5, phy_base + PCIE_PHY_IMPEDANCE);
+
+	/* set 50Mhz PHY clock */
+	writel(0x14, phy_base + PCIE_PHY_PLL_DIV_0);
+	writel(0x12, phy_base + PCIE_PHY_PLL_DIV_1);
+
+	/* set TX Differential output for lane 0 */
+	writel(0x7f, phy_base + PCIE_PHY_TRSV0_DRV_LVL);
+
+	/* set TX Pre-emphasis Level Control for lane 0 to minimum */
+	writel(0x0, phy_base + PCIE_PHY_TRSV0_EMP_LVL);
+
+	/* set RX clock and data recovery bandwidth */
+	writel(0xe7, phy_base + PCIE_PHY_PLL_BIAS);
+	writel(0x82, phy_base + PCIE_PHY_TRSV0_RXCDR);
+	writel(0x82, phy_base + PCIE_PHY_TRSV1_RXCDR);
+	writel(0x82, phy_base + PCIE_PHY_TRSV2_RXCDR);
+	writel(0x82, phy_base + PCIE_PHY_TRSV3_RXCDR);
+
+	/* change TX Pre-emphasis Level Control for lanes */
+	writel(0x39, phy_base + PCIE_PHY_TRSV0_EMP_LVL);
+	writel(0x39, phy_base + PCIE_PHY_TRSV1_EMP_LVL);
+	writel(0x39, phy_base + PCIE_PHY_TRSV2_EMP_LVL);
+	writel(0x39, phy_base + PCIE_PHY_TRSV3_EMP_LVL);
+
+	/* set LVCC */
+	writel(0x20, phy_base + PCIE_PHY_TRSV0_LVCC);
+	writel(0xa0, phy_base + PCIE_PHY_TRSV1_LVCC);
+	writel(0xa0, phy_base + PCIE_PHY_TRSV2_LVCC);
+	writel(0xa0, phy_base + PCIE_PHY_TRSV3_LVCC);
+}
+
+static void exynos_pcie_assert_reset(struct pcie_port *pp)
+{
+	if (pp->reset_gpio >= 0)
+		devm_gpio_request_one(pp->dev, pp->reset_gpio,
+				GPIOF_OUT_INIT_HIGH, "RESET");
+	return;
+}
+
+static int exynos_pcie_establish_link(struct pcie_port *pp)
+{
+	u32 val;
+	int count = 0;
+	void __iomem *elbi_base = pp->elbi_base;
+	void __iomem *block_base = pp->block_base;
+	void __iomem *phy_base = pp->phy_base;
+
+	if (dw_pcie_link_up(pp)) {
+		dev_err(pp->dev, "Link already up\n");
+		return 0;
+	}
+
+	/* assert reset signals */
+	exynos_pcie_assert_core_reset(pp);
+	exynos_pcie_assert_phy_reset(pp);
+
+	/* de-assert phy reset */
+	exynos_pcie_deassert_phy_reset(pp);
+
+	/* initialize phy */
+	exynos_pcie_init_phy(pp);
+
+	/* pulse for common reset */
+	writel(1, block_base + PCIE_PHY_COMMON_RESET);
+	udelay(500);
+	writel(0, block_base + PCIE_PHY_COMMON_RESET);
+
+	/* de-assert core reset */
+	exynos_pcie_deassert_core_reset(pp);
+
+	/* setup root complex */
+	dw_pcie_setup_rc(pp);
+
+	/* assert reset signal */
+	exynos_pcie_assert_reset(pp);
+
+	/* assert LTSSM enable */
+	writel(PCIE_ELBI_LTSSM_ENABLE, elbi_base + PCIE_APP_LTSSM_ENABLE);
+
+	/* check if the link is up or not */
+	while (!dw_pcie_link_up(pp)) {
+		mdelay(100);
+		count++;
+		if (count == 10) {
+			while (readl(phy_base + PCIE_PHY_PLL_LOCKED) == 0) {
+				val = readl(block_base + PCIE_PHY_PLL_LOCKED);
+				dev_info(pp->dev, "PLL Locked: 0x%x\n", val);
+			}
+			dev_err(pp->dev, "PCIe Link Fail\n");
+			return -EINVAL;
+		}
+	}
+
+	dev_info(pp->dev, "Link up\n");
+
+	return 0;
+}
+
+static void exynos_pcie_clear_irq_pulse(struct pcie_port *pp)
+{
+	u32 val;
+	void __iomem *elbi_base = pp->elbi_base;
+
+	val = readl(elbi_base + PCIE_IRQ_PULSE);
+	writel(val, elbi_base + PCIE_IRQ_PULSE);
+	return;
+}
+
+static void exynos_pcie_enable_irq_pulse(struct pcie_port *pp)
+{
+	u32 val;
+	void __iomem *elbi_base = pp->elbi_base;
+
+	/* enable INTX interrupt */
+	val = IRQ_INTA_ASSERT | IRQ_INTB_ASSERT |
+		IRQ_INTC_ASSERT | IRQ_INTD_ASSERT,
+	writel(val, elbi_base + PCIE_IRQ_EN_PULSE);
+	return;
+}
+
+static irqreturn_t exynos_pcie_irq_handler(int irq, void *arg)
+{
+	struct pcie_port *pp = arg;
+
+	exynos_pcie_clear_irq_pulse(pp);
+	return IRQ_HANDLED;
+}
+
+static void exynos_pcie_enable_interrupts(struct pcie_port *pp)
+{
+	exynos_pcie_enable_irq_pulse(pp);
+	return;
+}
+
+static inline void exynos_pcie_readl_rc(struct pcie_port *pp, void *dbi_base,
+					u32 *val)
+{
+	exynos_pcie_sideband_dbi_r_mode(pp, true);
+	*val = readl(dbi_base);
+	exynos_pcie_sideband_dbi_r_mode(pp, false);
+	return;
+}
+
+static inline void exynos_pcie_writel_rc(struct pcie_port *pp, u32 val,
+					void *dbi_base)
+{
+	exynos_pcie_sideband_dbi_w_mode(pp, true);
+	writel(val, dbi_base);
+	exynos_pcie_sideband_dbi_w_mode(pp, false);
+	return;
+}
+
+static int exynos_pcie_rd_own_conf(struct pcie_port *pp, int where, int size,
+				u32 *val)
+{
+	int ret;
+
+	exynos_pcie_sideband_dbi_r_mode(pp, true);
+	ret = cfg_read(pp->dbi_base + (where & ~0x3), where, size, val);
+	exynos_pcie_sideband_dbi_r_mode(pp, false);
+	return ret;
+}
+
+static int exynos_pcie_wr_own_conf(struct pcie_port *pp, int where, int size,
+				u32 val)
+{
+	int ret;
+
+	exynos_pcie_sideband_dbi_w_mode(pp, true);
+	ret = cfg_write(pp->dbi_base + (where & ~0x3), where, size, val);
+	exynos_pcie_sideband_dbi_w_mode(pp, false);
+	return ret;
+}
+
+static int exynos_pcie_link_up(struct pcie_port *pp)
+{
+	u32 val = readl(pp->elbi_base + PCIE_ELBI_RDLH_LINKUP);
+
+	if (val == PCIE_ELBI_LTSSM_ENABLE)
+		return 1;
+
+	return 0;
+}
+
+static void exynos_pcie_host_init(struct pcie_port *pp)
+{
+	exynos_pcie_establish_link(pp);
+	exynos_pcie_enable_interrupts(pp);
+}
+
+static struct dw_pcie_host_ops exynos_pcie_host_ops = {
+	.readl_rc = exynos_pcie_readl_rc,
+	.writel_rc = exynos_pcie_writel_rc,
+	.rd_own_conf = exynos_pcie_rd_own_conf,
+	.wr_own_conf = exynos_pcie_wr_own_conf,
+	.link_up = exynos_pcie_link_up,
+	.host_init = exynos_pcie_host_init,
+};
+
+static int add_pcie_port(struct pcie_port *pp, struct platform_device *pdev)
+{
+	struct resource *elbi_base;
+	struct resource *phy_base;
+	struct resource *block_base;
+	int ret;
+
+	elbi_base = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!elbi_base) {
+		dev_err(&pdev->dev, "couldn't get elbi base resource\n");
+		return -EINVAL;
+	}
+	pp->elbi_base = devm_ioremap_resource(&pdev->dev, elbi_base);
+	if (IS_ERR(pp->elbi_base))
+		return PTR_ERR(pp->elbi_base);
+
+	phy_base = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+	if (!phy_base) {
+		dev_err(&pdev->dev, "couldn't get phy base resource\n");
+		return -EINVAL;
+	}
+	pp->phy_base = devm_ioremap_resource(&pdev->dev, phy_base);
+	if (IS_ERR(pp->phy_base))
+		return PTR_ERR(pp->phy_base);
+
+	block_base = platform_get_resource(pdev, IORESOURCE_MEM, 2);
+	if (!block_base) {
+		dev_err(&pdev->dev, "couldn't get block base resource\n");
+		return -EINVAL;
+	}
+	pp->block_base = devm_ioremap_resource(&pdev->dev, block_base);
+	if (IS_ERR(pp->block_base))
+		return PTR_ERR(pp->block_base);
+
+	pp->irq = platform_get_irq(pdev, 1);
+	if (!pp->irq) {
+		dev_err(&pdev->dev, "failed to get irq\n");
+		return -ENODEV;
+	}
+	ret = devm_request_irq(&pdev->dev, pp->irq, exynos_pcie_irq_handler,
+				IRQF_SHARED, "exynos-pcie", pp);
+	if (ret) {
+		dev_err(&pdev->dev, "failed to request irq\n");
+		return ret;
+	}
+
+	pp->root_bus_nr = -1;
+	pp->ops = &exynos_pcie_host_ops;
+
+	spin_lock_init(&pp->conf_lock);
+	ret = dw_pcie_host_init(pp);
+	if (ret) {
+		dev_err(&pdev->dev, "failed to initialize host\n");
+		return ret;
+	}
+
+	return 0;
+}
+
+static int __init exynos_pcie_probe(struct platform_device *pdev)
+{
+	struct pcie_port *pp;
+	struct device_node *np = pdev->dev.of_node;
+	int ret;
+
+	pp = devm_kzalloc(&pdev->dev, sizeof(*pp), GFP_KERNEL);
+	if (!pp) {
+		dev_err(&pdev->dev, "no memory for pcie port\n");
+		return -ENOMEM;
+	}
+
+	pp->dev = &pdev->dev;
+
+	pp->reset_gpio = of_get_named_gpio(np, "reset-gpio", 0);
+
+	pp->clk = devm_clk_get(&pdev->dev, "pcie");
+	if (IS_ERR(pp->clk)) {
+		dev_err(&pdev->dev, "Failed to get pcie rc clock\n");
+		return PTR_ERR(pp->clk);
+	}
+	ret = clk_prepare_enable(pp->clk);
+	if (ret)
+		return ret;
+
+	pp->bus_clk = devm_clk_get(&pdev->dev, "pcie_bus");
+	if (IS_ERR(pp->bus_clk)) {
+		dev_err(&pdev->dev, "Failed to get pcie bus clock\n");
+		ret = PTR_ERR(pp->bus_clk);
+		goto fail_clk;
+	}
+	ret = clk_prepare_enable(pp->bus_clk);
+	if (ret)
+		goto fail_clk;
+
+	ret = add_pcie_port(pp, pdev);
+	if (ret < 0)
+		goto fail_bus_clk;
+
+	pp->controller = dw_pci.nr_controllers;
+	dw_pci.nr_controllers = 1;
+	dw_pci.private_data = (void **)&pp;
+
+	pci_common_init(&dw_pci);
+	pci_assign_unassigned_resources();
+#ifdef CONFIG_PCI_DOMAINS
+	dw_pci.domain++;
+#endif
+
+	platform_set_drvdata(pdev, pp);
+	return 0;
+
+fail_bus_clk:
+	clk_disable_unprepare(pp->bus_clk);
+fail_clk:
+	clk_disable_unprepare(pp->clk);
+	return ret;
+}
+
+static int __exit exynos_pcie_remove(struct platform_device *pdev)
+{
+	struct pcie_port *pp = platform_get_drvdata(pdev);
+
+	clk_disable_unprepare(pp->bus_clk);
+	clk_disable_unprepare(pp->clk);
+
+	return 0;
+}
+
+static const struct of_device_id exynos_pcie_of_match[] = {
+	{ .compatible = "samsung,exynos5440-pcie", },
+	{},
+};
+MODULE_DEVICE_TABLE(of, exynos_pcie_of_match);
+
+static struct platform_driver exynos_pcie_driver = {
+	.remove		= __exit_p(exynos_pcie_remove),
+	.driver = {
+		.name	= "exynos-pcie",
+		.owner	= THIS_MODULE,
+		.of_match_table = of_match_ptr(exynos_pcie_of_match),
+	},
+};
+
+/* Exynos PCIe driver does not allow module unload */
+
+static int __init pcie_init(void)
+{
+	return platform_driver_probe(&exynos_pcie_driver, exynos_pcie_probe);
+}
+subsys_initcall(pcie_init);
+
+MODULE_AUTHOR("Jingoo Han <[e-mail]>");
+MODULE_DESCRIPTION("Samsung PCIe host controller driver");
+MODULE_LICENSE("GPL v2");