From 33dea5aae0320345af26ae9aba0894a930e0d4ec Mon Sep 17 00:00:00 2001 From: Logan Gunthorpe Date: Thu, 3 Aug 2017 12:19:46 -0600 Subject: NTB: 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 Reviewed-by: Stephen Bates Reviewed-by: Kurt Schwemmer Acked-by: Allen Hubbe Acked-by: Bjorn Helgaas Signed-off-by: Jon Mason --- 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/ntb_hw_switchtec.c | 81 ++++++++++++++++++++++++++++++++++ 5 files changed, 93 insertions(+) create mode 100644 drivers/ntb/hw/mscc/Kconfig create mode 100644 drivers/ntb/hw/mscc/Makefile create mode 100644 drivers/ntb/hw/mscc/ntb_hw_switchtec.c (limited to 'drivers/ntb/hw') 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..064686ead1ba --- /dev/null +++ b/drivers/ntb/hw/mscc/Makefile @@ -0,0 +1 @@ +obj-$(CONFIG_NTB_SWITCHTEC) += ntb_hw_switchtec.o diff --git a/drivers/ntb/hw/mscc/ntb_hw_switchtec.c b/drivers/ntb/hw/mscc/ntb_hw_switchtec.c new file mode 100644 index 000000000000..253efba72275 --- /dev/null +++ b/drivers/ntb/hw/mscc/ntb_hw_switchtec.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 +#include + +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); -- cgit v1.2.3