PCI: exynos: Split into Synopsys part and Exynos part

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 <jg1.han@samsung.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Cc: Pratyush Anand <pratyush.anand@st.com>
Cc: Mohit KUMAR <Mohit.KUMAR@st.com>
This commit is contained in:
Jingoo Han 2013-07-31 17:14:10 +09:00 committed by Bjorn Helgaas
parent 5477a33b51
commit 4b1ced841b
6 changed files with 1000 additions and 866 deletions

View File

@ -18,6 +18,7 @@ Required properties:
- interrupt-map-mask and interrupt-map: standard PCI properties
to define the mapping of the PCIe interface to interrupt
numbers.
- num-lanes: number of lanes to use
- reset-gpio: gpio pin number of power good signal
Example:
@ -41,6 +42,7 @@ SoC specific DT Entry:
#interrupt-cells = <1>;
interrupt-map-mask = <0 0 0 0>;
interrupt-map = <0x0 0 &gic 53>;
num-lanes = <4>;
};
pcie@2a0000 {
@ -60,6 +62,7 @@ SoC specific DT Entry:
#interrupt-cells = <1>;
interrupt-map-mask = <0 0 0 0>;
interrupt-map = <0x0 0 &gic 56>;
num-lanes = <4>;
};
Board specific DT Entry:

View File

@ -248,6 +248,7 @@
#interrupt-cells = <1>;
interrupt-map-mask = <0 0 0 0>;
interrupt-map = <0x0 0 &gic 53>;
num-lanes = <4>;
};
pcie@2a0000 {
@ -267,5 +268,6 @@
#interrupt-cells = <1>;
interrupt-map-mask = <0 0 0 0>;
interrupt-map = <0x0 0 &gic 56>;
num-lanes = <4>;
};
};

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@ -1,2 +1,3 @@
obj-$(CONFIG_PCI_MVEBU) += pci-mvebu.o
obj-$(CONFIG_PCIE_DW) += pcie-designware.o
obj-$(CONFIG_PCI_EXYNOS) += pci-exynos.o
obj-$(CONFIG_PCI_MVEBU) += pci-mvebu.o

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@ -0,0 +1,530 @@
/*
* PCIe host controller driver for Samsung EXYNOS SoCs
*
* Copyright (C) 2013 Samsung Electronics Co., Ltd.
* http://www.samsung.com
*
* Author: Jingoo Han <jg1.han@samsung.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/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"
#define to_exynos_pcie(x) container_of(x, struct exynos_pcie, pp)
struct exynos_pcie {
void __iomem *elbi_base;
void __iomem *phy_base;
void __iomem *block_base;
int reset_gpio;
struct clk *clk;
struct clk *bus_clk;
struct pcie_port pp;
};
/* 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;
struct exynos_pcie *exynos_pcie = to_exynos_pcie(pp);
if (on) {
val = readl(exynos_pcie->elbi_base + PCIE_ELBI_SLV_AWMISC);
val |= PCIE_ELBI_SLV_DBI_ENABLE;
writel(val, exynos_pcie->elbi_base + PCIE_ELBI_SLV_AWMISC);
} else {
val = readl(exynos_pcie->elbi_base + PCIE_ELBI_SLV_AWMISC);
val &= ~PCIE_ELBI_SLV_DBI_ENABLE;
writel(val, exynos_pcie->elbi_base + PCIE_ELBI_SLV_AWMISC);
}
}
static void exynos_pcie_sideband_dbi_r_mode(struct pcie_port *pp, bool on)
{
u32 val;
struct exynos_pcie *exynos_pcie = to_exynos_pcie(pp);
if (on) {
val = readl(exynos_pcie->elbi_base + PCIE_ELBI_SLV_ARMISC);
val |= PCIE_ELBI_SLV_DBI_ENABLE;
writel(val, exynos_pcie->elbi_base + PCIE_ELBI_SLV_ARMISC);
} else {
val = readl(exynos_pcie->elbi_base + PCIE_ELBI_SLV_ARMISC);
val &= ~PCIE_ELBI_SLV_DBI_ENABLE;
writel(val, exynos_pcie->elbi_base + PCIE_ELBI_SLV_ARMISC);
}
}
static void exynos_pcie_assert_core_reset(struct pcie_port *pp)
{
u32 val;
struct exynos_pcie *exynos_pcie = to_exynos_pcie(pp);
void __iomem *elbi_base = exynos_pcie->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;
struct exynos_pcie *exynos_pcie = to_exynos_pcie(pp);
void __iomem *elbi_base = exynos_pcie->elbi_base;
void __iomem *block_base = exynos_pcie->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)
{
struct exynos_pcie *exynos_pcie = to_exynos_pcie(pp);
void __iomem *block_base = exynos_pcie->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)
{
struct exynos_pcie *exynos_pcie = to_exynos_pcie(pp);
void __iomem *elbi_base = exynos_pcie->elbi_base;
void __iomem *block_base = exynos_pcie->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)
{
struct exynos_pcie *exynos_pcie = to_exynos_pcie(pp);
void __iomem *phy_base = exynos_pcie->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)
{
struct exynos_pcie *exynos_pcie = to_exynos_pcie(pp);
if (exynos_pcie->reset_gpio >= 0)
devm_gpio_request_one(pp->dev, exynos_pcie->reset_gpio,
GPIOF_OUT_INIT_HIGH, "RESET");
return;
}
static int exynos_pcie_establish_link(struct pcie_port *pp)
{
u32 val;
int count = 0;
struct exynos_pcie *exynos_pcie = to_exynos_pcie(pp);
void __iomem *elbi_base = exynos_pcie->elbi_base;
void __iomem *block_base = exynos_pcie->block_base;
void __iomem *phy_base = exynos_pcie->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;
struct exynos_pcie *exynos_pcie = to_exynos_pcie(pp);
void __iomem *elbi_base = exynos_pcie->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;
struct exynos_pcie *exynos_pcie = to_exynos_pcie(pp);
void __iomem *elbi_base = exynos_pcie->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 __iomem *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 __iomem *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)
{
struct exynos_pcie *exynos_pcie = to_exynos_pcie(pp);
u32 val = readl(exynos_pcie->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 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)
{
int ret;
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 exynos_pcie *exynos_pcie;
struct pcie_port *pp;
struct device_node *np = pdev->dev.of_node;
struct resource *elbi_base;
struct resource *phy_base;
struct resource *block_base;
int ret;
exynos_pcie = devm_kzalloc(&pdev->dev, sizeof(*exynos_pcie),
GFP_KERNEL);
if (!exynos_pcie) {
dev_err(&pdev->dev, "no memory for exynos pcie\n");
return -ENOMEM;
}
pp = &exynos_pcie->pp;
pp->dev = &pdev->dev;
exynos_pcie->reset_gpio = of_get_named_gpio(np, "reset-gpio", 0);
exynos_pcie->clk = devm_clk_get(&pdev->dev, "pcie");
if (IS_ERR(exynos_pcie->clk)) {
dev_err(&pdev->dev, "Failed to get pcie rc clock\n");
return PTR_ERR(exynos_pcie->clk);
}
ret = clk_prepare_enable(exynos_pcie->clk);
if (ret)
return ret;
exynos_pcie->bus_clk = devm_clk_get(&pdev->dev, "pcie_bus");
if (IS_ERR(exynos_pcie->bus_clk)) {
dev_err(&pdev->dev, "Failed to get pcie bus clock\n");
ret = PTR_ERR(exynos_pcie->bus_clk);
goto fail_clk;
}
ret = clk_prepare_enable(exynos_pcie->bus_clk);
if (ret)
goto fail_clk;
elbi_base = platform_get_resource(pdev, IORESOURCE_MEM, 0);
exynos_pcie->elbi_base = devm_ioremap_resource(&pdev->dev, elbi_base);
if (IS_ERR(exynos_pcie->elbi_base))
return PTR_ERR(exynos_pcie->elbi_base);
phy_base = platform_get_resource(pdev, IORESOURCE_MEM, 1);
exynos_pcie->phy_base = devm_ioremap_resource(&pdev->dev, phy_base);
if (IS_ERR(exynos_pcie->phy_base))
return PTR_ERR(exynos_pcie->phy_base);
block_base = platform_get_resource(pdev, IORESOURCE_MEM, 2);
exynos_pcie->block_base = devm_ioremap_resource(&pdev->dev, block_base);
if (IS_ERR(exynos_pcie->block_base))
return PTR_ERR(exynos_pcie->block_base);
ret = add_pcie_port(pp, pdev);
if (ret < 0)
goto fail_bus_clk;
platform_set_drvdata(pdev, exynos_pcie);
return 0;
fail_bus_clk:
clk_disable_unprepare(exynos_pcie->bus_clk);
fail_clk:
clk_disable_unprepare(exynos_pcie->clk);
return ret;
}
static int __exit exynos_pcie_remove(struct platform_device *pdev)
{
struct exynos_pcie *exynos_pcie = platform_get_drvdata(pdev);
clk_disable_unprepare(exynos_pcie->bus_clk);
clk_disable_unprepare(exynos_pcie->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 <jg1.han@samsung.com>");
MODULE_DESCRIPTION("Samsung PCIe host controller driver");
MODULE_LICENSE("GPL v2");

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@ -0,0 +1,65 @@
/*
* Synopsys Designware PCIe host controller driver
*
* Copyright (C) 2013 Samsung Electronics Co., Ltd.
* http://www.samsung.com
*
* Author: Jingoo Han <jg1.han@samsung.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
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 root_bus_nr;
void __iomem *dbi_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;
int irq;
u32 lanes;
struct pcie_host_ops *ops;
};
struct pcie_host_ops {
void (*readl_rc)(struct pcie_port *pp,
void __iomem *dbi_base, u32 *val);
void (*writel_rc)(struct pcie_port *pp,
u32 val, void __iomem *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 unsigned long global_io_offset;
int cfg_read(void __iomem *addr, int where, int size, u32 *val);
int cfg_write(void __iomem *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);