Subject: [PATCH V10 1/4] pci: Add PCIe driver for Samsung Exynos

From: [email-masked] (Bjorn Helgaas)
Date: Mon, 24 Jun 2013 20:11:02 -0600

On Fri, Jun 21, 2013 at 04:24:54PM +0900, Jingoo Han wrote:
> Exynos5440 has a PCIe controller which can be used as Root Complex.
> This driver supports a PCIe controller as Root Complex mode.
> 
> Signed-off-by: Surendranath Gurivireddy Balla <[email-masked]>
> Signed-off-by: Siva Reddy Kallam <[email-masked]>
> Signed-off-by: Jingoo Han <[email-masked]>
> Acked-by: Arnd Bergmann <[email-masked]>

Acked-by: Bjorn Helgaas <[email-masked]>

Please merge this through arm-soc as you discussed.

> ---
>  .../devicetree/bindings/pci/designware-pcie.txt    |   73 ++
>  drivers/pci/host/Kconfig                           |    9 +
>  drivers/pci/host/Makefile                          |    1 +
>  drivers/pci/host/pcie-designware.c                 | 1057 ++++++++++++++++++++
>  4 files changed, 1140 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/pci/designware-pcie.txt
>  create mode 100644 drivers/pci/host/pcie-designware.c
> 
> diff --git a/Documentation/devicetree/bindings/pci/designware-pcie.txt b/Documentation/devicetree/bindings/pci/designware-pcie.txt
> new file mode 100644
> index 0000000..e2371f5
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/pci/designware-pcie.txt
> @@ -0,0 +1,73 @@
> +* Synopsis Designware PCIe interface
> +
> +Required properties:
> +- compatible: should contain "snps,dw-pcie" to identify the
> +	core, plus an identifier for the specific instance, such
> +	as "samsung,exynos5440-pcie".
> +- reg: base addresses and lengths of the pcie controller,
> +	the phy controller, additional register for the phy controller.
> +- interrupts: interrupt values for level interrupt,
> +	pulse interrupt, special interrupt.
> +- clocks: from common clock binding: handle to pci clock.
> +- clock-names: from common clock binding: should be "pcie" and "pcie_bus".
> +- #address-cells: set to <3>
> +- #size-cells: set to <2>
> +- device_type: set to "pci"
> +- ranges: ranges for the PCI memory and I/O regions
> +- #interrupt-cells: set to <1>
> +- interrupt-map-mask and interrupt-map: standard PCI properties
> +	to define the mapping of the PCIe interface to interrupt
> +	numbers.
> +- reset-gpio: gpio pin number of power good signal
> +
> +Example:
> +
> +SoC specific DT Entry:
> +
> +	pcie at 290000 {
> +		compatible = "samsung,exynos5440-pcie", "snps,dw-pcie";
> +		reg = <0x290000 0x1000
> +			0x270000 0x1000
> +			0x271000 0x40>;
> +		interrupts = <0 20 0>, <0 21 0>, <0 22 0>;
> +		clocks = <&clock 28>, <&clock 27>;
> +		clock-names = "pcie", "pcie_bus";
> +		#address-cells = <3>;
> +		#size-cells = <2>;
> +		device_type = "pci";
> +		ranges = <0x00000800 0 0x40000000 0x40000000 0 0x00001000   /* configuration space */
> +			  0x81000000 0 0	  0x40001000 0 0x00010000   /* downstream I/O */
> +			  0x82000000 0 0x40011000 0x40011000 0 0x1ffef000>; /* non-prefetchable memory */
> +		#interrupt-cells = <1>;
> +		interrupt-map-mask = <0 0 0 0>;
> +		interrupt-map = <0x0 0 &gic 53>;
> +	};
> +
> +	pcie at 2a0000 {
> +		compatible = "samsung,exynos5440-pcie", "snps,dw-pcie";
> +		reg = <0x2a0000 0x1000
> +			0x272000 0x1000
> +			0x271040 0x40>;
> +		interrupts = <0 23 0>, <0 24 0>, <0 25 0>;
> +		clocks = <&clock 29>, <&clock 27>;
> +		clock-names = "pcie", "pcie_bus";
> +		#address-cells = <3>;
> +		#size-cells = <2>;
> +		device_type = "pci";
> +		ranges = <0x00000800 0 0x60000000 0x60000000 0 0x00001000   /* configuration space */
> +			  0x81000000 0 0	  0x60001000 0 0x00010000   /* downstream I/O */
> +			  0x82000000 0 0x60011000 0x60011000 0 0x1ffef000>; /* non-prefetchable memory */
> +		#interrupt-cells = <1>;
> +		interrupt-map-mask = <0 0 0 0>;
> +		interrupt-map = <0x0 0 &gic 56>;
> +	};
> +
> +Board specific DT Entry:
> +
> +	pcie at 290000 {
> +		reset-gpio = <&pin_ctrl 5 0>;
> +	};
> +
> +	pcie at 2a0000 {
> +		reset-gpio = <&pin_ctrl 22 0>;
> +	};
> diff --git a/drivers/pci/host/Kconfig b/drivers/pci/host/Kconfig
> index 1f1d67f..1184ff6 100644
> --- a/drivers/pci/host/Kconfig
> +++ b/drivers/pci/host/Kconfig
> @@ -5,4 +5,13 @@ config PCI_MVEBU
>  	bool "Marvell EBU PCIe controller"
>  	depends on ARCH_MVEBU || ARCH_KIRKWOOD
>  
> +config PCIE_DW
> +	bool
> +
> +config PCI_EXYNOS
> +	bool "Samsung Exynos PCIe controller"
> +	depends on SOC_EXYNOS5440
> +	select PCIEPORTBUS
> +	select PCIE_DW
> +
>  endmenu
> diff --git a/drivers/pci/host/Makefile b/drivers/pci/host/Makefile
> index 5ea2d8b..086d850 100644
> --- a/drivers/pci/host/Makefile
> +++ b/drivers/pci/host/Makefile
> @@ -1 +1,2 @@
>  obj-$(CONFIG_PCI_MVEBU) += pci-mvebu.o
> +obj-$(CONFIG_PCIE_DW) += pcie-designware.o
> diff --git a/drivers/pci/host/pcie-designware.c b/drivers/pci/host/pcie-designware.c
> new file mode 100644
> index 0000000..26bdbda
> --- /dev/null
> +++ b/drivers/pci/host/pcie-designware.c
> @@ -0,0 +1,1057 @@
> +/*
> + * PCIe host controller driver for Samsung EXYNOS SoCs
> + *
> + * Copyright (C) 2013 Samsung Electronics Co., Ltd.
> + *		http://www.samsung.com
> + *
> + * Author: Jingoo Han <[email-masked]>
> + *
> + * 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/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.
> + */
> +
> +/* Synopsis specific PCIE configuration registers */
> +#define PCIE_PORT_LINK_CONTROL		0x710
> +#define PORT_LINK_MODE_MASK		(0x3f << 16)
> +#define PORT_LINK_MODE_4_LANES		(0x7 << 16)
> +
> +#define PCIE_LINK_WIDTH_SPEED_CONTROL	0x80C
> +#define PORT_LOGIC_SPEED_CHANGE		(0x1 << 17)
> +#define PORT_LOGIC_LINK_WIDTH_MASK	(0x1ff << 8)
> +#define PORT_LOGIC_LINK_WIDTH_4_LANES	(0x7 << 8)
> +
> +#define PCIE_MSI_ADDR_LO		0x820
> +#define PCIE_MSI_ADDR_HI		0x824
> +#define PCIE_MSI_INTR0_ENABLE		0x828
> +#define PCIE_MSI_INTR0_MASK		0x82C
> +#define PCIE_MSI_INTR0_STATUS		0x830
> +
> +#define PCIE_ATU_VIEWPORT		0x900
> +#define PCIE_ATU_REGION_INBOUND		(0x1 << 31)
> +#define PCIE_ATU_REGION_OUTBOUND	(0x0 << 31)
> +#define PCIE_ATU_REGION_INDEX1		(0x1 << 0)
> +#define PCIE_ATU_REGION_INDEX0		(0x0 << 0)
> +#define PCIE_ATU_CR1			0x904
> +#define PCIE_ATU_TYPE_MEM		(0x0 << 0)
> +#define PCIE_ATU_TYPE_IO		(0x2 << 0)
> +#define PCIE_ATU_TYPE_CFG0		(0x4 << 0)
> +#define PCIE_ATU_TYPE_CFG1		(0x5 << 0)
> +#define PCIE_ATU_CR2			0x908
> +#define PCIE_ATU_ENABLE			(0x1 << 31)
> +#define PCIE_ATU_BAR_MODE_ENABLE	(0x1 << 30)
> +#define PCIE_ATU_LOWER_BASE		0x90C
> +#define PCIE_ATU_UPPER_BASE		0x910
> +#define PCIE_ATU_LIMIT			0x914
> +#define PCIE_ATU_LOWER_TARGET		0x918
> +#define PCIE_ATU_BUS(x)			(((x) & 0xff) << 24)
> +#define PCIE_ATU_DEV(x)			(((x) & 0x1f) << 19)
> +#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;
> +
> +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)
> +{
> +	*val = readl(addr);
> +
> +	if (size == 1)
> +		*val = (*val >> (8 * (where & 3))) & 0xff;
> +	else if (size == 2)
> +		*val = (*val >> (8 * (where & 3))) & 0xffff;
> +	else if (size != 4)
> +		return PCIBIOS_BAD_REGISTER_NUMBER;
> +
> +	return PCIBIOS_SUCCESSFUL;
> +}
> +
> +static inline int cfg_write(void *addr, int where, int size, u32 val)
> +{
> +	if (size == 4)
> +		writel(val, addr);
> +	else if (size == 2)
> +		writew(val, addr + (where & 2));
> +	else if (size == 1)
> +		writeb(val, addr + (where & 3));
> +	else
> +		return PCIBIOS_BAD_REGISTER_NUMBER;
> +
> +	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)
> +{
> +	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;
> +}
> +
> +static inline void 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 void exynos_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,
> +			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);
> +	val = PCIE_ATU_ENABLE;
> +	writel_rc(pp, val, dbi_base + PCIE_ATU_CR2);
> +}
> +
> +static void exynos_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);
> +	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,
> +			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);
> +}
> +
> +static void exynos_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);
> +	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,
> +			dbi_base + PCIE_ATU_LIMIT);
> +	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),
> +			dbi_base + PCIE_ATU_UPPER_TARGET);
> +}
> +
> +static void exynos_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);
> +	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,
> +			dbi_base + PCIE_ATU_LIMIT);
> +	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),
> +			dbi_base + PCIE_ATU_UPPER_TARGET);
> +}
> +
> +static int exynos_pcie_rd_other_conf(struct pcie_port *pp, struct pci_bus *bus,
> +		u32 devfn, int where, int size, u32 *val)
> +{
> +	int ret = PCIBIOS_SUCCESSFUL;
> +	u32 address, busdev;
> +
> +	busdev = PCIE_ATU_BUS(bus->number) | PCIE_ATU_DEV(PCI_SLOT(devfn)) |
> +		 PCIE_ATU_FUNC(PCI_FUNC(devfn));
> +	address = where & ~0x3;
> +
> +	if (bus->parent->number == pp->root_bus_nr) {
> +		exynos_pcie_prog_viewport_cfg0(pp, busdev);
> +		ret = cfg_read(pp->va_cfg0_base + address, where, size, val);
> +		exynos_pcie_prog_viewport_mem_outbound(pp);
> +	} else {
> +		exynos_pcie_prog_viewport_cfg1(pp, busdev);
> +		ret = cfg_read(pp->va_cfg1_base + address, where, size, val);
> +		exynos_pcie_prog_viewport_io_outbound(pp);
> +	}
> +
> +	return ret;
> +}
> +
> +static int exynos_pcie_wr_other_conf(struct pcie_port *pp, struct pci_bus *bus,
> +		u32 devfn, int where, int size, u32 val)
> +{
> +	int ret = PCIBIOS_SUCCESSFUL;
> +	u32 address, busdev;
> +
> +	busdev = PCIE_ATU_BUS(bus->number) | PCIE_ATU_DEV(PCI_SLOT(devfn)) |
> +		 PCIE_ATU_FUNC(PCI_FUNC(devfn));
> +	address = where & ~0x3;
> +
> +	if (bus->parent->number == pp->root_bus_nr) {
> +		exynos_pcie_prog_viewport_cfg0(pp, busdev);
> +		ret = cfg_write(pp->va_cfg0_base + address, where, size, val);
> +		exynos_pcie_prog_viewport_mem_outbound(pp);
> +	} else {
> +		exynos_pcie_prog_viewport_cfg1(pp, busdev);
> +		ret = cfg_write(pp->va_cfg1_base + address, where, size, val);
> +		exynos_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,
> +				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))
> +			return 0;
> +	}
> +
> +	/* access only one slot on each root port */
> +	if (bus->number == pp->root_bus_nr && dev > 0)
> +		return 0;
> +
> +	/*
> +	 * do not read more than one device on the bus directly attached
> +	 * to RC's (Virtual Bridge's) DS side.
> +	 */
> +	if (bus->primary == pp->root_bus_nr && dev > 0)
> +		return 0;
> +
> +	return 1;
> +}
> +
> +static int exynos_pcie_rd_conf(struct pci_bus *bus, u32 devfn, int where,
> +			int size, u32 *val)
> +{
> +	struct pcie_port *pp = sys_to_pcie(bus->sysdata);
> +	unsigned long flags;
> +	int ret;
> +
> +	if (!pp) {
> +		BUG();
> +		return -EINVAL;
> +	}
> +
> +	if (exynos_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,
> +						where, size, val);
> +	else
> +		ret = exynos_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,
> +			int where, int size, u32 val)
> +{
> +	struct pcie_port *pp = sys_to_pcie(bus->sysdata);
> +	unsigned long flags;
> +	int ret;
> +
> +	if (!pp) {
> +		BUG();
> +		return -EINVAL;
> +	}
> +
> +	if (exynos_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,
> +						where, size, val);
> +	else
> +		ret = exynos_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_bus *exynos_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,
> +					sys, &sys->resources);
> +	} else {
> +		bus = NULL;
> +		BUG();
> +	}
> +
> +	return bus;
> +}
> +
> +static int exynos_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,
> +};
> +
> +static void exynos_pcie_setup_rc(struct pcie_port *pp)
> +{
> +	struct pcie_port_info *config = &pp->config;
> +	void __iomem *dbi_base = pp->dbi_base;
> +	u32 val;
> +	u32 membase;
> +	u32 memlimit;
> +
> +	/* set the number of lines as 4 */
> +	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);
> +
> +	/* set link width speed control register */
> +	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);
> +
> +	/* setup RC BARs */
> +	writel_rc(pp, 0x00000004, dbi_base + PCI_BASE_ADDRESS_0);
> +	writel_rc(pp, 0x00000004, dbi_base + PCI_BASE_ADDRESS_1);
> +
> +	/* setup interrupt pins */
> +	readl_rc(pp, dbi_base + PCI_INTERRUPT_LINE, &val);
> +	val &= 0xffff00ff;
> +	val |= 0x00000100;
> +	writel_rc(pp, val, dbi_base + PCI_INTERRUPT_LINE);
> +
> +	/* setup bus numbers */
> +	readl_rc(pp, dbi_base + PCI_PRIMARY_BUS, &val);
> +	val &= 0xff000000;
> +	val |= 0x00010100;
> +	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);
> +
> +	/* setup command register */
> +	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;
> +}
> +subsys_initcall(pcie_init);
> +
> +MODULE_AUTHOR("Jingoo Han <[email-masked]>");
> +MODULE_DESCRIPTION("Samsung PCIe host controller driver");
> +MODULE_LICENSE("GPL v2");
> -- 
> 1.7.10.4
> 
>