lkml.org 
[lkml]   [2017]   [Jul]   [25]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    Patch in this message
    /
    From
    Date
    Subject[PATCH v3 08/16] switchtec_ntb: introduce initial NTB driver
    Seeing the Switchtec NTB hardware shares the same endpoint as the
    management endpoint we utilize the class_interface API to register
    an NTB driver for every Switchtec device in the system that has the
    NTB class code.

    Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
    Reviewed-by: Stephen Bates <sbates@raithlin.com>
    Reviewed-by: Kurt Schwemmer <kurt.schwemmer@microsemi.com>
    ---
    MAINTAINERS | 1 +
    drivers/ntb/hw/Kconfig | 1 +
    drivers/ntb/hw/Makefile | 1 +
    drivers/ntb/hw/mscc/Kconfig | 9 +++++
    drivers/ntb/hw/mscc/Makefile | 1 +
    drivers/ntb/hw/mscc/switchtec_ntb.c | 81 +++++++++++++++++++++++++++++++++++++
    drivers/pci/switch/switchtec.c | 3 ++
    include/linux/switchtec.h | 4 ++
    8 files changed, 101 insertions(+)
    create mode 100644 drivers/ntb/hw/mscc/Kconfig
    create mode 100644 drivers/ntb/hw/mscc/Makefile
    create mode 100644 drivers/ntb/hw/mscc/switchtec_ntb.c

    diff --git a/MAINTAINERS b/MAINTAINERS
    index 4ff2ad7c1c7b..6e491ce5e876 100644
    --- a/MAINTAINERS
    +++ b/MAINTAINERS
    @@ -10147,6 +10147,7 @@ F: Documentation/ABI/testing/sysfs-class-switchtec
    F: drivers/pci/switch/switchtec*
    F: include/uapi/linux/switchtec_ioctl.h
    F: include/linux/switchtec.h
    +F: drivers/ntb/hw/mscc/

    PCI DRIVER FOR NVIDIA TEGRA
    M: Thierry Reding <thierry.reding@gmail.com>
    diff --git a/drivers/ntb/hw/Kconfig b/drivers/ntb/hw/Kconfig
    index a89243c9fdd3..e51b581fd102 100644
    --- a/drivers/ntb/hw/Kconfig
    +++ b/drivers/ntb/hw/Kconfig
    @@ -1,3 +1,4 @@
    source "drivers/ntb/hw/amd/Kconfig"
    source "drivers/ntb/hw/idt/Kconfig"
    source "drivers/ntb/hw/intel/Kconfig"
    +source "drivers/ntb/hw/mscc/Kconfig"
    diff --git a/drivers/ntb/hw/Makefile b/drivers/ntb/hw/Makefile
    index 87332c3905f0..923c442db750 100644
    --- a/drivers/ntb/hw/Makefile
    +++ b/drivers/ntb/hw/Makefile
    @@ -1,3 +1,4 @@
    obj-$(CONFIG_NTB_AMD) += amd/
    obj-$(CONFIG_NTB_IDT) += idt/
    obj-$(CONFIG_NTB_INTEL) += intel/
    +obj-$(CONFIG_NTB_SWITCHTEC) += mscc/
    diff --git a/drivers/ntb/hw/mscc/Kconfig b/drivers/ntb/hw/mscc/Kconfig
    new file mode 100644
    index 000000000000..013ed6716438
    --- /dev/null
    +++ b/drivers/ntb/hw/mscc/Kconfig
    @@ -0,0 +1,9 @@
    +config NTB_SWITCHTEC
    + tristate "MicroSemi Switchtec Non-Transparent Bridge Support"
    + select PCI_SW_SWITCHTEC
    + help
    + Enables NTB support for Switchtec PCI switches. This also
    + selects the Switchtec management driver as they share the same
    + hardware interface.
    +
    + If unsure, say N.
    diff --git a/drivers/ntb/hw/mscc/Makefile b/drivers/ntb/hw/mscc/Makefile
    new file mode 100644
    index 000000000000..21907b364e19
    --- /dev/null
    +++ b/drivers/ntb/hw/mscc/Makefile
    @@ -0,0 +1 @@
    +obj-$(CONFIG_NTB_SWITCHTEC) += switchtec_ntb.o
    diff --git a/drivers/ntb/hw/mscc/switchtec_ntb.c b/drivers/ntb/hw/mscc/switchtec_ntb.c
    new file mode 100644
    index 000000000000..253efba72275
    --- /dev/null
    +++ b/drivers/ntb/hw/mscc/switchtec_ntb.c
    @@ -0,0 +1,81 @@
    +/*
    + * Microsemi Switchtec(tm) PCIe Management Driver
    + * Copyright (c) 2017, Microsemi Corporation
    + *
    + * This program is free software; you can redistribute it and/or modify it
    + * under the terms and conditions of the GNU General Public License,
    + * version 2, as published by the Free Software Foundation.
    + *
    + * This program is distributed in the hope it will be useful, but WITHOUT
    + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
    + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
    + * more details.
    + *
    + */
    +
    +#include <linux/switchtec.h>
    +#include <linux/module.h>
    +
    +MODULE_DESCRIPTION("Microsemi Switchtec(tm) NTB Driver");
    +MODULE_VERSION("0.1");
    +MODULE_LICENSE("GPL");
    +MODULE_AUTHOR("Microsemi Corporation");
    +
    +struct switchtec_ntb {
    + struct switchtec_dev *stdev;
    +};
    +
    +static int switchtec_ntb_add(struct device *dev,
    + struct class_interface *class_intf)
    +{
    + struct switchtec_dev *stdev = to_stdev(dev);
    + struct switchtec_ntb *sndev;
    +
    + stdev->sndev = NULL;
    +
    + if (stdev->pdev->class != MICROSEMI_NTB_CLASSCODE)
    + return -ENODEV;
    +
    + sndev = kzalloc_node(sizeof(*sndev), GFP_KERNEL, dev_to_node(dev));
    + if (!sndev)
    + return -ENOMEM;
    +
    + sndev->stdev = stdev;
    +
    + stdev->sndev = sndev;
    + dev_info(dev, "NTB device registered");
    +
    + return 0;
    +}
    +
    +void switchtec_ntb_remove(struct device *dev,
    + struct class_interface *class_intf)
    +{
    + struct switchtec_dev *stdev = to_stdev(dev);
    + struct switchtec_ntb *sndev = stdev->sndev;
    +
    + if (!sndev)
    + return;
    +
    + stdev->sndev = NULL;
    + kfree(sndev);
    + dev_info(dev, "ntb device unregistered");
    +}
    +
    +static struct class_interface switchtec_interface = {
    + .add_dev = switchtec_ntb_add,
    + .remove_dev = switchtec_ntb_remove,
    +};
    +
    +static int __init switchtec_ntb_init(void)
    +{
    + switchtec_interface.class = switchtec_class;
    + return class_interface_register(&switchtec_interface);
    +}
    +module_init(switchtec_ntb_init);
    +
    +static void __exit switchtec_ntb_exit(void)
    +{
    + class_interface_unregister(&switchtec_interface);
    +}
    +module_exit(switchtec_ntb_exit);
    diff --git a/drivers/pci/switch/switchtec.c b/drivers/pci/switch/switchtec.c
    index 807569e62bee..0666e33c305b 100644
    --- a/drivers/pci/switch/switchtec.c
    +++ b/drivers/pci/switch/switchtec.c
    @@ -1275,6 +1275,9 @@ static int switchtec_pci_probe(struct pci_dev *pdev,
    struct switchtec_dev *stdev;
    int rc;

    + if (pdev->class == MICROSEMI_NTB_CLASSCODE)
    + request_module_nowait("switchtec_ntb");
    +
    stdev = stdev_create(pdev);
    if (IS_ERR(stdev))
    return PTR_ERR(stdev);
    diff --git a/include/linux/switchtec.h b/include/linux/switchtec.h
    index d8159944f013..09d73d0d1aa8 100644
    --- a/include/linux/switchtec.h
    +++ b/include/linux/switchtec.h
    @@ -320,6 +320,8 @@ struct pff_csr_regs {
    u32 reserved4[174];
    } __packed;

    +struct switchtec_ntb;
    +
    struct switchtec_dev {
    struct pci_dev *pdev;
    struct device dev;
    @@ -357,6 +359,8 @@ struct switchtec_dev {
    struct work_struct link_event_work;
    void (*link_notifier)(struct switchtec_dev *stdev);
    u8 link_event_count[SWITCHTEC_MAX_PFF_CSR];
    +
    + struct switchtec_ntb *sndev;
    };

    static inline struct switchtec_dev *to_stdev(struct device *dev)
    --
    2.11.0
    \
     
     \ /
      Last update: 2017-07-25 22:58    [W:4.153 / U:0.020 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site