subject:"\[RFC PATCH 05\/13\] switchtec_ntb\: introduce initial ntb driver"

[RFC PATCH 05/13] switchtec_ntb: introduce initial ntb driver

2017-06-15 Thread Logan Gunthorpe

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 
---
 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 +
 include/linux/switchtec.h   |  4 ++
 7 files changed, 98 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 6cee5e253ec3..fbd88be1be03 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -9842,6 +9842,7 @@ 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 
diff --git a/drivers/ntb/hw/Kconfig b/drivers/ntb/hw/Kconfig
index 7116472b4625..1d1360db87e1 100644
--- a/drivers/ntb/hw/Kconfig
+++ b/drivers/ntb/hw/Kconfig
@@ -1,2 +1,3 @@
 source "drivers/ntb/hw/amd/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 532e0859b4a1..690c00274174 100644
--- a/drivers/ntb/hw/Makefile
+++ b/drivers/ntb/hw/Makefile
@@ -1,2 +1,3 @@
 obj-$(CONFIG_NTB_AMD)  += amd/
 obj-$(CONFIG_NTB_INTEL)+= intel/
+obj-$(CONFIG_NTB_SWITCHTEC) += mscc/
diff --git a/drivers/ntb/hw/mscc/Kconfig b/drivers/ntb/hw/mscc/Kconfig
new file mode 100644
index ..013ed6716438
--- /dev/null
+++ b/drivers/ntb/hw/mscc/Kconfig
@@ -0,0 +1,9 @@
+config NTB_SWITCHTEC
+   tristate "MicroSemi Switchtec Non-Transparent Bridge Support"
+   select PCI_SW_SWITCHTEC
+   help
+Enables NTB support for Switchtec PCI switches. This also
+selects the Switchtec management driver as they share the same
+hardware interface.
+
+If unsure, say N.
diff --git a/drivers/ntb/hw/mscc/Makefile b/drivers/ntb/hw/mscc/Makefile
new file mode 100644
index ..21907b364e19
--- /dev/null
+++ b/drivers/ntb/hw/mscc/Makefile
@@ -0,0 +1 @@
+obj-$(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 ..1f094216aa1c
--- /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 
+#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  = {
+   .class = _class,
+   .add_dev = switchtec_ntb_add,
+   .remove_dev = switchtec_ntb_remove,
+};
+
+static int __init switchtec_ntb_init(void)
+{
+   return class_interface_register(_interface);
+}
+module_init(switchtec_ntb_init);
+
+static

[RFC PATCH 05/13] switchtec_ntb: introduce initial ntb driver

2017-06-15 Thread Logan Gunthorpe

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 
---
 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 +
 include/linux/switchtec.h   |  4 ++
 7 files changed, 98 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 6cee5e253ec3..fbd88be1be03 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -9842,6 +9842,7 @@ 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 
diff --git a/drivers/ntb/hw/Kconfig b/drivers/ntb/hw/Kconfig
index 7116472b4625..1d1360db87e1 100644
--- a/drivers/ntb/hw/Kconfig
+++ b/drivers/ntb/hw/Kconfig
@@ -1,2 +1,3 @@
 source "drivers/ntb/hw/amd/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 532e0859b4a1..690c00274174 100644
--- a/drivers/ntb/hw/Makefile
+++ b/drivers/ntb/hw/Makefile
@@ -1,2 +1,3 @@
 obj-$(CONFIG_NTB_AMD)  += amd/
 obj-$(CONFIG_NTB_INTEL)+= intel/
+obj-$(CONFIG_NTB_SWITCHTEC) += mscc/
diff --git a/drivers/ntb/hw/mscc/Kconfig b/drivers/ntb/hw/mscc/Kconfig
new file mode 100644
index ..013ed6716438
--- /dev/null
+++ b/drivers/ntb/hw/mscc/Kconfig
@@ -0,0 +1,9 @@
+config NTB_SWITCHTEC
+   tristate "MicroSemi Switchtec Non-Transparent Bridge Support"
+   select PCI_SW_SWITCHTEC
+   help
+Enables NTB support for Switchtec PCI switches. This also
+selects the Switchtec management driver as they share the same
+hardware interface.
+
+If unsure, say N.
diff --git a/drivers/ntb/hw/mscc/Makefile b/drivers/ntb/hw/mscc/Makefile
new file mode 100644
index ..21907b364e19
--- /dev/null
+++ b/drivers/ntb/hw/mscc/Makefile
@@ -0,0 +1 @@
+obj-$(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 ..1f094216aa1c
--- /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 
+#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  = {
+   .class = _class,
+   .add_dev = switchtec_ntb_add,
+   .remove_dev = switchtec_ntb_remove,
+};
+
+static int __init switchtec_ntb_init(void)
+{
+   return class_interface_register(_interface);
+}
+module_init(switchtec_ntb_init);
+
+static void __exit switchtec_ntb_exit(void)
+{
+   class_interface_unregister(_interface);
+}

[RFC PATCH 05/13] switchtec_ntb: introduce initial ntb driver

[RFC PATCH 05/13] switchtec_ntb: introduce initial ntb driver

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