[+cc Rob, Yijing]
On Mon, Mar 09, 2015 at 05:38:05PM -0700, Ray Jui wrote:
> This adds the support for Broadcom iProc PCIe controller
>
> pcie-iproc.c servers as the common core driver, and front-end bus
> interface needs to be added to support different bus interfaces
>
> pcie-iproc-pltfm.c contains the support for the platform bus interface
>
> Signed-off-by: Ray Jui <rjui@xxxxxxxxxxxx>
> Reviewed-by: Scott Branden <sbraden@xxxxxxxxxxxx>
> ---
> drivers/pci/host/Kconfig | 17 ++
> drivers/pci/host/Makefile | 2 +
> drivers/pci/host/pcie-iproc-pltfm.c | 108 +++++++++++
> drivers/pci/host/pcie-iproc.c | 351 +++++++++++++++++++++++++++++++++++
> drivers/pci/host/pcie-iproc.h | 42 +++++
> 5 files changed, 520 insertions(+)
> create mode 100644 drivers/pci/host/pcie-iproc-pltfm.c
> create mode 100644 drivers/pci/host/pcie-iproc.c
> create mode 100644 drivers/pci/host/pcie-iproc.h
>
> diff --git a/drivers/pci/host/Kconfig b/drivers/pci/host/Kconfig
> index 7b892a9..f4d9c90 100644
> --- a/drivers/pci/host/Kconfig
> +++ b/drivers/pci/host/Kconfig
> @@ -106,4 +106,21 @@ config PCI_VERSATILE
> bool "ARM Versatile PB PCI controller"
> depends on ARCH_VERSATILE
>
> +config PCIE_IPROC
> + tristate "Broadcom iProc PCIe controller"
> + help
> + This enables the iProc PCIe core controller support for Broadcom's
> + iProc family of SoCs. An appropriate bus interface driver also needs
> + to be enabled
> +
> +config PCIE_IPROC_PLTFM
> + tristate "Broadcom iProc PCIe platform bus driver"
> + depends on ARCH_BCM_IPROC || COMPILE_TEST
> + depends on OF
> + select PCIE_IPROC
> + default ARCH_BCM_IPROC
> + help
> + Say Y here if you want to use the Broadcom iProc PCIe controller
> + through the generic platform bus interface
Do you anticipate additional front-end bus interfaces? If not, and maybe
even if you do, you might squash everything into pcie-iproc.c. Then you
only need one file (no .h file needed) and the package is a little
simpler. I think it's pretty common to have multiple driver registration
methods in the same file (OF, PCI, ACPI, etc.) And I think it's common to
have those methods guarded by the generic config symbol (CONFIG_PCI,
CONFIG_OF, etc.) rather than defining new ones specific to the driver.
> +
> endmenu
> diff --git a/drivers/pci/host/Makefile b/drivers/pci/host/Makefile
> index e61d91c..2e02d20 100644
> --- a/drivers/pci/host/Makefile
> +++ b/drivers/pci/host/Makefile
> @@ -13,3 +13,5 @@ obj-$(CONFIG_PCIE_XILINX) += pcie-xilinx.o
> obj-$(CONFIG_PCI_XGENE) += pci-xgene.o
> obj-$(CONFIG_PCI_LAYERSCAPE) += pci-layerscape.o
> obj-$(CONFIG_PCI_VERSATILE) += pci-versatile.o
> +obj-$(CONFIG_PCIE_IPROC) += pcie-iproc.o
> +obj-$(CONFIG_PCIE_IPROC_PLTFM) += pcie-iproc-pltfm.o
> diff --git a/drivers/pci/host/pcie-iproc-pltfm.c b/drivers/pci/host/pcie-iproc-pltfm.c
> new file mode 100644
> index 0000000..af935ea
> --- /dev/null
> +++ b/drivers/pci/host/pcie-iproc-pltfm.c
> @@ -0,0 +1,108 @@
> +/*
> + * Copyright (C) 2015 Broadcom Corporation
> + *
> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU General Public License as
> + * published by the Free Software Foundation version 2.
> + *
> + * This program is distributed "as is" WITHOUT ANY WARRANTY of any
> + * kind, whether express or implied; without even the implied warranty
> + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + */
> +
> +#include <linux/kernel.h>
> +#include <linux/pci.h>
> +#include <linux/clk.h>
> +#include <linux/module.h>
> +#include <linux/slab.h>
> +#include <linux/interrupt.h>
> +#include <linux/platform_device.h>
> +#include <linux/of_address.h>
> +#include <linux/of_pci.h>
> +#include <linux/of_irq.h>
> +#include <linux/of_platform.h>
> +#include <linux/phy/phy.h>
> +
> +#include "pcie-iproc.h"
> +
> +static int __init iproc_pcie_pltfm_probe(struct platform_device *pdev)
> +{
> + struct iproc_pcie *pcie;
> + struct device_node *np = pdev->dev.of_node;
> + struct resource reg;
> + resource_size_t iobase = 0;
> + LIST_HEAD(res);
> + int ret;
> +
> + pcie = devm_kzalloc(&pdev->dev, sizeof(struct iproc_pcie), GFP_KERNEL);
> + if (!pcie)
> + return -ENOMEM;
> +
> + pcie->dev = &pdev->dev;
> + platform_set_drvdata(pdev, pcie);
> +
> + ret = of_address_to_resource(np, 0, ®);
> + if (ret < 0) {
> + dev_err(pcie->dev, "unable to obtain controller resources\n");
> + return ret;
> + }
> +
> + pcie->base = devm_ioremap(pcie->dev, reg.start, resource_size(®));
> + if (!pcie->base) {
> + dev_err(pcie->dev, "unable to map controller registers\n");
> + return -ENOMEM;
> + }
> +
> + /* PHY use is optional */
> + pcie->phy = devm_phy_get(&pdev->dev, "pcie-phy");
> + if (IS_ERR(pcie->phy)) {
> + if (PTR_ERR(pcie->phy) == -EPROBE_DEFER)
> + return -EPROBE_DEFER;
> + pcie->phy = NULL;
> + }
> +
> + ret = of_pci_get_host_bridge_resources(np, 0, 0xff, &res, &iobase);
> + if (ret) {
> + dev_err(pcie->dev,
> + "unable to get PCI host bridge resources\n");
> + return ret;
> + }
> +
> + pcie->resources = &res;
> +
> + ret = iproc_pcie_setup(pcie);
> + if (ret) {
> + dev_err(pcie->dev, "PCIe controller setup failed\n");
> + return ret;
> + }
> +
> + return 0;
> +}
> +
> +static int iproc_pcie_pltfm_remove(struct platform_device *pdev)
> +{
> + struct iproc_pcie *pcie = platform_get_drvdata(pdev);
> +
> + return iproc_pcie_remove(pcie);
> +}
> +
> +static const struct of_device_id iproc_pcie_of_match_table[] = {
> + { .compatible = "brcm,iproc-pcie", },
> + { /* sentinel */ }
> +};
> +MODULE_DEVICE_TABLE(of, iproc_pcie_of_match_table);
> +
> +static struct platform_driver iproc_pcie_pltfm_driver = {
> + .driver = {
> + .name = "iproc-pcie",
> + .of_match_table = of_match_ptr(iproc_pcie_of_match_table),
> + },
> + .probe = iproc_pcie_pltfm_probe,
> + .remove = iproc_pcie_pltfm_remove,
> +};
> +module_platform_driver(iproc_pcie_pltfm_driver);
> +
> +MODULE_AUTHOR("Ray Jui <rjui@xxxxxxxxxxxx>");
> +MODULE_DESCRIPTION("Broadcom iPROC PCIe platform driver");
> +MODULE_LICENSE("GPL v2");
> diff --git a/drivers/pci/host/pcie-iproc.c b/drivers/pci/host/pcie-iproc.c
> new file mode 100644
> index 0000000..ad6c89e
> --- /dev/null
> +++ b/drivers/pci/host/pcie-iproc.c
> @@ -0,0 +1,351 @@
> +/*
> + * Copyright (C) 2014 Hauke Mehrtens <hauke@xxxxxxxxxx>
> + * Copyright (C) 2015 Broadcom Corporatcommon ion
> + *
> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU General Public License as
> + * published by the Free Software Foundation version 2.
> + *
> + * This program is distributed "as is" WITHOUT ANY WARRANTY of any
> + * kind, whether express or implied; without even the implied warranty
> + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + */
> +
> +#include <linux/kernel.h>
> +#include <linux/pci.h>
> +#include <linux/msi.h>
> +#include <linux/clk.h>
> +#include <linux/module.h>
> +#include <linux/mbus.h>
> +#include <linux/slab.h>
> +#include <linux/delay.h>
> +#include <linux/interrupt.h>
> +#include <linux/platform_device.h>
> +#include <linux/of_address.h>
> +#include <linux/of_pci.h>
> +#include <linux/of_irq.h>
> +#include <linux/of_platform.h>
> +#include <linux/phy/phy.h>
> +
> +#include "pcie-iproc.h"
> +
> +#define CLK_CONTROL_OFFSET 0x000
> +#define EP_MODE_SURVIVE_PERST_SHIFT 1
> +#define EP_MODE_SURVIVE_PERST BIT(EP_MODE_SURVIVE_PERST_SHIFT)
> +#define RC_PCIE_RST_OUTPUT_SHIFT 0
> +#define RC_PCIE_RST_OUTPUT BIT(RC_PCIE_RST_OUTPUT_SHIFT)
> +
> +#define CFG_IND_ADDR_OFFSET 0x120
> +#define CFG_IND_ADDR_MASK 0x00001ffc
> +
> +#define CFG_IND_DATA_OFFSET 0x124
> +
> +#define CFG_ADDR_OFFSET 0x1f8
> +#define CFG_ADDR_BUS_NUM_SHIFT 20
> +#define CFG_ADDR_BUS_NUM_MASK 0x0ff00000
> +#define CFG_ADDR_DEV_NUM_SHIFT 15
> +#define CFG_ADDR_DEV_NUM_MASK 0x000f8000
> +#define CFG_ADDR_FUNC_NUM_SHIFT 12
> +#define CFG_ADDR_FUNC_NUM_MASK 0x00007000
> +#define CFG_ADDR_REG_NUM_SHIFT 2
> +#define CFG_ADDR_REG_NUM_MASK 0x00000ffc
> +#define CFG_ADDR_CFG_TYPE_SHIFT 0
> +#define CFG_ADDR_CFG_TYPE_MASK 0x00000003
> +
> +#define CFG_DATA_OFFSET 0x1fc
> +
> +#define SYS_RC_INTX_EN 0x330
> +#define SYS_RC_INTX_MASK 0xf
> +
> +static inline struct iproc_pcie *sys_to_pcie(struct pci_sys_data *sys)
> +{
> + return sys->private_data;
> +}
> +
> +#define INVALID_ACCESS_OFFSET 0xffffffff
> +static u32 iproc_pcie_cfg_base(struct iproc_pcie *pcie, int busno,
> + unsigned int devfn, int where)
> +{
> + int slot = PCI_SLOT(devfn);
> + int fn = PCI_FUNC(devfn);
> + u32 val;
> +
Would you mind adding a comment to the effect that
CFG_IND_ADDR_OFFSET/CFG_IND_DATA_OFFSET and
CFG_ADDR_OFFSET/CFG_DATA_OFFSET are protected by pci_lock?
They obviously need a mutex, and while I don't have any plans to
change it, I'm not completely 100% sure that pci_lock is the best
place for it.
> + /* root complex access */
> + if (busno == 0) {
> + if (slot >= 1)
> + return INVALID_ACCESS_OFFSET;
> + writel(where & CFG_IND_ADDR_MASK,
> + pcie->base + CFG_IND_ADDR_OFFSET);
> + return CFG_IND_DATA_OFFSET;
> + }
> +
> + if (fn > 1)
> + return INVALID_ACCESS_OFFSET;
> +
> + /* EP device access */
> + val = (busno << CFG_ADDR_BUS_NUM_SHIFT) |
> + (slot << CFG_ADDR_DEV_NUM_SHIFT) |
> + (fn << CFG_ADDR_FUNC_NUM_SHIFT) |
> + (where & CFG_ADDR_REG_NUM_MASK) |
> + (1 & CFG_ADDR_CFG_TYPE_MASK);
> + writel(val, pcie->base + CFG_ADDR_OFFSET);
> +
> + return CFG_DATA_OFFSET;
> +}
> +
> +#define INVALID_CFG_RD 0xffffffff
> +static int iproc_pcie_read_conf(struct iproc_pcie *pcie, int busno,
> + unsigned int devfn, int where, int size,
> + u32 *val)
> +{
> + u32 offset, mask, shift;
> +
> + *val = INVALID_CFG_RD;
> +
> + if (size != 1 && size != 2 && size != 4)
> + return PCIBIOS_BAD_REGISTER_NUMBER;
> + else if ((size == 2) && (where & 1))
> + return PCIBIOS_BAD_REGISTER_NUMBER;
> + else if ((size == 4) && (where & 3))
> + return PCIBIOS_BAD_REGISTER_NUMBER;
> +
> + offset = iproc_pcie_cfg_base(pcie, busno, devfn, where);
> + if (offset == INVALID_ACCESS_OFFSET)
> + return PCIBIOS_BAD_REGISTER_NUMBER;
> +
> + *val = readl(pcie->base + offset);
> +
> + if (size != 4) {
> + mask = (1 << (size * BITS_PER_BYTE)) - 1;
> + shift = (where % 4) * BITS_PER_BYTE;
> + *val = (*val >> shift) & mask;
> + }
> +
> + dev_dbg(pcie->dev,
> + "conf rd: busn=%d devfn=%u where=%d size=%d val=0x%08x\n",
> + busno, devfn, where, size, *val);
> +
> + return PCIBIOS_SUCCESSFUL;
> +}
This looks like maybe it could use Rob Herring's (CC'd) new generic config
accessors? For example, see these:
1f94a94f67e1 ("PCI: Add generic config accessors")
21186728865e ("PCI: generic: Convert to use generic config accessors")
> +
> +static int iproc_pcie_write_conf(struct iproc_pcie *pcie, int busno,
> + unsigned int devfn, int where, int size,
> + u32 val)
> +{
> + u32 offset, mask, shift, data;
> +
> + if (size != 1 && size != 2 && size != 4)
> + return PCIBIOS_BAD_REGISTER_NUMBER;
> + else if ((size == 2) && (where & 1))
> + return PCIBIOS_BAD_REGISTER_NUMBER;
> + else if ((size == 4) && (where & 3))
> + return PCIBIOS_BAD_REGISTER_NUMBER;
> +
> + offset = iproc_pcie_cfg_base(pcie, busno, devfn, where);
> + if (offset == INVALID_ACCESS_OFFSET)
> + return PCIBIOS_BAD_REGISTER_NUMBER;
> +
> + data = readl(pcie->base + offset);
> +
> + if (size != 4) {
> + mask = (1 << (size * BITS_PER_BYTE)) - 1;
> + shift = (where % 4) * BITS_PER_BYTE;
> + data &= ~(mask << shift);
> + data |= (val & mask) << shift;
> + } else {
> + data = val;
> + }
> +
> + writel(data, pcie->base + offset);
> +
> + dev_dbg(pcie->dev,
> + "conf wr: busn=%d devfn=%u where=%d size=%d data=0x%08x\n",
> + busno, devfn, where, size, data);
> +
> + return PCIBIOS_SUCCESSFUL;
> +}
> +
> +static int iproc_pcie_read(struct pci_bus *bus, unsigned int devfn,
> + int where, int size, u32 *val)
> +{
> + struct iproc_pcie *pcie = sys_to_pcie(bus->sysdata);
> +
> + return iproc_pcie_read_conf(pcie, bus->number, devfn, where, size,
> + val);
> +}
> +
> +static int iproc_pcie_write(struct pci_bus *bus, unsigned int devfn,
> + int where, int size, u32 val)
> +{
> + struct iproc_pcie *pcie = sys_to_pcie(bus->sysdata);
> +
> + return iproc_pcie_write_conf(pcie, bus->number, devfn, where, size,
> + val);
> +}
> +
> +static struct pci_ops iproc_pcie_ops = {
> + .read = iproc_pcie_read,
> + .write = iproc_pcie_write,
> +};
> +
> +static void iproc_pcie_reset(struct iproc_pcie *pcie)
> +{
> + u32 val;
> +
> + /*
> + * Configure the PCIe controller as root complex and send a downstream
> + * reset
> + */
> + val = EP_MODE_SURVIVE_PERST | RC_PCIE_RST_OUTPUT;
> + writel(val, pcie->base + CLK_CONTROL_OFFSET);
> + udelay(250);
> + val &= ~EP_MODE_SURVIVE_PERST;
> + writel(val, pcie->base + CLK_CONTROL_OFFSET);
> + msleep(250);
> +}
> +
> +static int iproc_pcie_check_link(struct iproc_pcie *pcie, struct pci_bus *bus)
> +{
> + u8 hdr_type;
> + u32 link_ctrl;
> + u16 pos, link_status;
> + int link_is_active = 0;
> +
> + /* make sure we are not in EP mode */
> + pci_bus_read_config_byte(bus, 0, PCI_HEADER_TYPE, &hdr_type);
> + if ((hdr_type & 0x7f) != PCI_HEADER_TYPE_BRIDGE) {
> + dev_err(pcie->dev, "in EP mode, hdr=0x08%x\n", hdr_type);
> + return -EFAULT;
> + }
> +
> + /* force class to PCI_CLASS_BRIDGE_PCI (0x0604) */
> + pci_bus_write_config_word(bus, 0, PCI_CLASS_DEVICE,
> + PCI_CLASS_BRIDGE_PCI);
> +
> + /* check link status to see if link is active */
> + pos = pci_bus_find_capability(bus, 0, PCI_CAP_ID_EXP);
> + pci_bus_read_config_word(bus, 0, pos + PCI_EXP_LNKSTA, &link_status);
> + if (link_status & PCI_EXP_LNKSTA_NLW)
> + link_is_active = 1;
> +
> + if (!link_is_active) {
> + /* try GEN 1 link speed */
> +#define PCI_LINK_STATUS_CTRL_2_OFFSET 0x0dc
> +#define PCI_TARGET_LINK_SPEED_MASK 0xf
> +#define PCI_TARGET_LINK_SPEED_GEN2 0x2
> +#define PCI_TARGET_LINK_SPEED_GEN1 0x1
> + pci_bus_read_config_dword(bus, 0,
> + PCI_LINK_STATUS_CTRL_2_OFFSET,
> + &link_ctrl);
> + if ((link_ctrl & PCI_TARGET_LINK_SPEED_MASK) ==
> + PCI_TARGET_LINK_SPEED_GEN2) {
> + link_ctrl &= ~PCI_TARGET_LINK_SPEED_MASK;
> + link_ctrl |= PCI_TARGET_LINK_SPEED_GEN1;
> + pci_bus_write_config_dword(bus, 0,
> + PCI_LINK_STATUS_CTRL_2_OFFSET,
> + link_ctrl);
> + msleep(100);
> +
> + pos = pci_bus_find_capability(bus, 0, PCI_CAP_ID_EXP);
> + pci_bus_read_config_word(bus, 0, pos + PCI_EXP_LNKSTA,
> + &link_status);
> + if (link_status & PCI_EXP_LNKSTA_NLW)
> + link_is_active = 1;
> + }
> + }
> +
> + dev_info(pcie->dev, "link: %s\n", link_is_active ? "UP" : "DOWN");
> +
> + return link_is_active ? 0 : -ENODEV;
> +}
> +
> +static void iproc_pcie_enable(struct iproc_pcie *pcie)
> +{
> + writel(SYS_RC_INTX_MASK, pcie->base + SYS_RC_INTX_EN);
> +}
> +
> +int iproc_pcie_setup(struct iproc_pcie *pcie)
> +{
> + int ret;
> + struct pci_bus *bus;
> +
> + if (!pcie || !pcie->dev || !pcie->base)
> + return -EINVAL;
> +
> + if (pcie->phy) {
> + ret = phy_init(pcie->phy);
> + if (ret) {
> + dev_err(pcie->dev, "unable to initialize PCIe PHY\n");
> + return ret;
> + }
> +
> + ret = phy_power_on(pcie->phy);
> + if (ret) {
> + dev_err(pcie->dev, "unable to power on PCIe PHY\n");
> + goto err_exit_phy;
> + }
> +
> + }
> +
> + iproc_pcie_reset(pcie);
> +
> + pcie->sysdata.private_data = pcie;
> +
> + bus = pci_create_root_bus(pcie->dev, 0, &iproc_pcie_ops,
> + &pcie->sysdata, pcie->resources);
> + if (!bus) {
> + dev_err(pcie->dev, "unable to create PCI root bus\n");
> + ret = -ENOMEM;
> + goto err_power_off_phy;
> + }
> + pcie->root_bus = bus;
> +
> + ret = iproc_pcie_check_link(pcie, bus);
> + if (ret) {
> + dev_err(pcie->dev, "no PCIe EP device detected\n");
> + goto err_rm_root_bus;
> + }
> +
> + iproc_pcie_enable(pcie);
> +
> + pci_scan_child_bus(bus);
> + pci_assign_unassigned_bus_resources(bus);
> + pci_bus_add_devices(bus);
> +
> + pci_fixup_irqs(pci_common_swizzle, of_irq_parse_and_map_pci);
I think the IRQ fixup should be before pci_bus_add_devices(). CC'd Yijing,
who's been fixing similar issues.
pci_bus_add_devices() is the point where drivers can claim these devices,
and we don't want to change things after a driver claims the device.
> +
> + return 0;
> +
> +err_rm_root_bus:
> + pci_stop_root_bus(bus);
> + pci_remove_root_bus(bus);
> +
> +err_power_off_phy:
> + if (pcie->phy)
> + phy_power_off(pcie->phy);
> +err_exit_phy:
> + if (pcie->phy)
> + phy_exit(pcie->phy);
> +
> + return ret;
> +}
> +EXPORT_SYMBOL(iproc_pcie_setup);
> +
> +int iproc_pcie_remove(struct iproc_pcie *pcie)
> +{
> + pci_stop_root_bus(pcie->root_bus);
> + pci_remove_root_bus(pcie->root_bus);
> +
> + if (pcie->phy) {
> + phy_power_off(pcie->phy);
> + phy_exit(pcie->phy);
> + }
> +
> + return 0;
> +}
> +EXPORT_SYMBOL(iproc_pcie_remove);
These exports wouldn't be needed if this were all squashed into one file.
> +
> +MODULE_AUTHOR("Ray Jui <rjui@xxxxxxxxxxxx>");
> +MODULE_DESCRIPTION("Broadcom iPROC PCIe common driver");
> +MODULE_LICENSE("GPL v2");
> diff --git a/drivers/pci/host/pcie-iproc.h b/drivers/pci/host/pcie-iproc.h
> new file mode 100644
> index 0000000..569bc04
> --- /dev/null
> +++ b/drivers/pci/host/pcie-iproc.h
> @@ -0,0 +1,42 @@
> +/*
> + * Copyright (C) 2014-2015 Broadcom Corporation
> + *
> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU General Public License as
> + * published by the Free Software Foundation version 2.
> + *
> + * This program is distributed "as is" WITHOUT ANY WARRANTY of any
> + * kind, whether express or implied; without even the implied warranty
> + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + */
> +
> +#ifndef _PCIE_IPROC_H
> +#define _PCIE_IPROC_H
> +
> +#define IPROC_PCIE_MAX_NUM_IRQS 6
> +
> +/**
> + * iProc PCIe device
> + * @dev: pointer to device data structure
> + * @base: PCIe host controller I/O register base
> + * @resources: linked list of all PCI resources
> + * @sysdata: Per PCI controller data
> + * @root_bus: pointer to root bus
> + * @phy: optional PHY device that controls the Serdes
> + * @irqs: interrupt IDs
> + */
> +struct iproc_pcie {
> + struct device *dev;
> + void __iomem *base;
> + struct list_head *resources;
> + struct pci_sys_data sysdata;
> + struct pci_bus *root_bus;
> + struct phy *phy;
> + int irqs[IPROC_PCIE_MAX_NUM_IRQS];
> +};
> +
> +extern int iproc_pcie_setup(struct iproc_pcie *pcie);
> +extern int iproc_pcie_remove(struct iproc_pcie *pcie);
Hopefully you can squash this all into one file, but if you can't, my
preference is to omit "extern" on function declarations.
> +
> +#endif /* _PCIE_IPROC_H */
> --
> 1.7.9.5
>
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