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NTB: switchtec_ntb: Introduce initial NTB driver

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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>
Acked-by: Allen Hubbe <Allen.Hubbe@dell.com>
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Jon Mason <jdmason@kudzu.us>
This commit is contained in:
Logan Gunthorpe 2017-08-03 12:19:46 -06:00 committed by Jon Mason
parent fa5ab66e36
commit 33dea5aae0
8 changed files with 101 additions and 0 deletions
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1
MAINTAINERS
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@ -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 <thomas.petazzoni@free-electrons.com>

1
drivers/ntb/hw/Kconfig
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@ -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"

1
drivers/ntb/hw/Makefile
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@ -1,3 +1,4 @@
obj-$(CONFIG_NTB_AMD) += amd/
obj-$(CONFIG_NTB_IDT) += idt/
obj-$(CONFIG_NTB_INTEL) += intel/
obj-$(CONFIG_NTB_SWITCHTEC) += mscc/

9
drivers/ntb/hw/mscc/Kconfig Normal file
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@ -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.

1
drivers/ntb/hw/mscc/Makefile Normal file
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@ -0,0 +1 @@
obj-$(CONFIG_NTB_SWITCHTEC) += ntb_hw_switchtec.o

81
drivers/ntb/hw/mscc/ntb_hw_switchtec.c Normal file
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@ -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);

3
drivers/pci/switch/switchtec.c
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@ -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("ntb_hw_switchtec");
stdev = stdev_create(pdev);
if (IS_ERR(stdev))
return PTR_ERR(stdev);

4
include/linux/switchtec.h
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@ -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)