Commit 33dea5aa authored by Logan Gunthorpe's avatar Logan Gunthorpe Committed by Jon Mason
Browse files

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: default avatarLogan Gunthorpe <>
Reviewed-by: default avatarStephen Bates <>
Reviewed-by: default avatarKurt Schwemmer <>
Acked-by: default avatarAllen Hubbe <>
Acked-by: default avatarBjorn Helgaas <>
Signed-off-by: default avatarJon Mason <>
parent fa5ab66e
......@@ -10348,6 +10348,7 @@ 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 MVEBU (Marvell Armada 370 and Armada XP SOC support)
M: Thomas Petazzoni <>
source "drivers/ntb/hw/amd/Kconfig"
source "drivers/ntb/hw/idt/Kconfig"
source "drivers/ntb/hw/intel/Kconfig"
source "drivers/ntb/hw/mscc/Kconfig"
obj-$(CONFIG_NTB_AMD) += amd/
obj-$(CONFIG_NTB_IDT) += idt/
obj-$(CONFIG_NTB_INTEL) += intel/
obj-$(CONFIG_NTB_SWITCHTEC) += mscc/
tristate "MicroSemi Switchtec Non-Transparent Bridge Support"
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.
obj-$(CONFIG_NTB_SWITCHTEC) += ntb_hw_switchtec.o
* 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_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)
stdev->sndev = NULL;
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);
static void __exit switchtec_ntb_exit(void)
......@@ -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)
stdev = stdev_create(pdev);
if (IS_ERR(stdev))
return PTR_ERR(stdev);
......@@ -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)
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