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Commit 5d8e1881 authored by Logan Gunthorpe's avatar Logan Gunthorpe Committed by Bjorn Helgaas
Browse files

switchtec: Add sysfs attributes to the Switchtec driver 



Add a few read-only sysfs attributes which provide some device information
that is exposed from the devices, primarily component and device names and
versions.

These are documented in Documentation/ABI/testing/sysfs-class-switchtec.

Tested-by: default avatarKrishna Dhulipala <krishnad@fb.com>
Signed-off-by: default avatarLogan Gunthorpe <logang@deltatee.com>
Signed-off-by: default avatarStephen Bates <stephen.bates@microsemi.com>
Signed-off-by: default avatarBjorn Helgaas <bhelgaas@google.com>
Reviewed-by: default avatarWei Zhang <wzhang@fb.com>
Reviewed-by: default avatarJens Axboe <axboe@fb.com>
Reviewed-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 44fc691b

Documentation/ABI/testing/sysfs-class-switchtec

0 → 100644
+96 −0
Original line number Diff line number Diff line 
switchtec - Microsemi Switchtec PCI Switch Management Endpoint



For details on this subsystem look at Documentation/switchtec.txt.



What: 		/sys/class/switchtec

Date:		05-Jan-2017

KernelVersion:	v4.11

Contact:	Logan Gunthorpe <logang@deltatee.com>

Description:	The switchtec class subsystem folder.

		Each registered switchtec driver is represented by a switchtecX

		subfolder (X being an integer >= 0).





What:		/sys/class/switchtec/switchtec[0-9]+/component_id

Date:		05-Jan-2017

KernelVersion:	v4.11

Contact:	Logan Gunthorpe <logang@deltatee.com>

Description:	Component identifier as stored in the hardware (eg. PM8543)

		(read only)

Values: 	arbitrary string.





What:		/sys/class/switchtec/switchtec[0-9]+/component_revision

Date:		05-Jan-2017

KernelVersion:	v4.11

Contact:	Logan Gunthorpe <logang@deltatee.com>

Description:	Component revision stored in the hardware (read only)

Values: 	integer.





What:		/sys/class/switchtec/switchtec[0-9]+/component_vendor

Date:		05-Jan-2017

KernelVersion:	v4.11

Contact:	Logan Gunthorpe <logang@deltatee.com>

Description:	Component vendor as stored in the hardware (eg. MICROSEM)

		(read only)

Values: 	arbitrary string.





What:		/sys/class/switchtec/switchtec[0-9]+/device_version

Date:		05-Jan-2017

KernelVersion:	v4.11

Contact:	Logan Gunthorpe <logang@deltatee.com>

Description:	Device version as stored in the hardware (read only)

Values: 	integer.





What:		/sys/class/switchtec/switchtec[0-9]+/fw_version

Date:		05-Jan-2017

KernelVersion:	v4.11

Contact:	Logan Gunthorpe <logang@deltatee.com>

Description:	Currently running firmware version (read only)

Values: 	integer (in hexadecimal).





What:		/sys/class/switchtec/switchtec[0-9]+/partition

Date:		05-Jan-2017

KernelVersion:	v4.11

Contact:	Logan Gunthorpe <logang@deltatee.com>

Description:	Partition number for this device in the switch (read only)

Values: 	integer.





What:		/sys/class/switchtec/switchtec[0-9]+/partition_count

Date:		05-Jan-2017

KernelVersion:	v4.11

Contact:	Logan Gunthorpe <logang@deltatee.com>

Description:	Total number of partitions in the switch (read only)

Values: 	integer.





What:		/sys/class/switchtec/switchtec[0-9]+/product_id

Date:		05-Jan-2017

KernelVersion:	v4.11

Contact:	Logan Gunthorpe <logang@deltatee.com>

Description:	Product identifier as stored in the hardware (eg. PSX 48XG3)

		(read only)

Values: 	arbitrary string.





What:		/sys/class/switchtec/switchtec[0-9]+/product_revision

Date:		05-Jan-2017

KernelVersion:	v4.11

Contact:	Logan Gunthorpe <logang@deltatee.com>

Description:	Product revision stored in the hardware (eg. RevB)

		(read only)

Values: 	arbitrary string.





What:		/sys/class/switchtec/switchtec[0-9]+/product_vendor

Date:		05-Jan-2017

KernelVersion:	v4.11

Contact:	Logan Gunthorpe <logang@deltatee.com>

Description:	Product vendor as stored in the hardware (eg. MICROSEM)

		(read only)

Values: 	arbitrary string.

MAINTAINERS

+1 −0
Original line number Diff line number Diff line
@@ -9662,6 +9662,7 @@ M: Logan Gunthorpe <logang@deltatee.com> 
L:	linux-pci@vger.kernel.org

S:	Maintained

F:	Documentation/switchtec.txt

F:	Documentation/ABI/testing/sysfs-class-switchtec

F:	drivers/pci/switch/switchtec*



PCI DRIVER FOR NVIDIA TEGRA

drivers/pci/switch/switchtec.c

+113 −0
Original line number Diff line number Diff line
@@ -486,6 +486,118 @@ static void mrpc_timeout_work(struct work_struct *work) 
	mutex_unlock(&stdev->mrpc_mutex);

}



static ssize_t device_version_show(struct device *dev,

	struct device_attribute *attr, char *buf)

{

	struct switchtec_dev *stdev = to_stdev(dev);

	u32 ver;



	ver = ioread32(&stdev->mmio_sys_info->device_version);



	return sprintf(buf, "%x\n", ver);

}

static DEVICE_ATTR_RO(device_version);



static ssize_t fw_version_show(struct device *dev,

	struct device_attribute *attr, char *buf)

{

	struct switchtec_dev *stdev = to_stdev(dev);

	u32 ver;



	ver = ioread32(&stdev->mmio_sys_info->firmware_version);



	return sprintf(buf, "%08x\n", ver);

}

static DEVICE_ATTR_RO(fw_version);



static ssize_t io_string_show(char *buf, void __iomem *attr, size_t len)

{

	int i;



	memcpy_fromio(buf, attr, len);

	buf[len] = '\n';

	buf[len + 1] = 0;



	for (i = len - 1; i > 0; i--) {

		if (buf[i] != ' ')

			break;

		buf[i] = '\n';

		buf[i + 1] = 0;

	}



	return strlen(buf);

}



#define DEVICE_ATTR_SYS_INFO_STR(field) \

static ssize_t field ## _show(struct device *dev, \

	struct device_attribute *attr, char *buf) \

{ \

	struct switchtec_dev *stdev = to_stdev(dev); \

	return io_string_show(buf, &stdev->mmio_sys_info->field, \

			    sizeof(stdev->mmio_sys_info->field)); \

} \

\

static DEVICE_ATTR_RO(field)



DEVICE_ATTR_SYS_INFO_STR(vendor_id);

DEVICE_ATTR_SYS_INFO_STR(product_id);

DEVICE_ATTR_SYS_INFO_STR(product_revision);

DEVICE_ATTR_SYS_INFO_STR(component_vendor);



static ssize_t component_id_show(struct device *dev,

	struct device_attribute *attr, char *buf)

{

	struct switchtec_dev *stdev = to_stdev(dev);

	int id = ioread16(&stdev->mmio_sys_info->component_id);



	return sprintf(buf, "PM%04X\n", id);

}

static DEVICE_ATTR_RO(component_id);



static ssize_t component_revision_show(struct device *dev,

	struct device_attribute *attr, char *buf)

{

	struct switchtec_dev *stdev = to_stdev(dev);

	int rev = ioread8(&stdev->mmio_sys_info->component_revision);



	return sprintf(buf, "%d\n", rev);

}

static DEVICE_ATTR_RO(component_revision);



static ssize_t partition_show(struct device *dev,

	struct device_attribute *attr, char *buf)

{

	struct switchtec_dev *stdev = to_stdev(dev);



	return sprintf(buf, "%d\n", stdev->partition);

}

static DEVICE_ATTR_RO(partition);



static ssize_t partition_count_show(struct device *dev,

	struct device_attribute *attr, char *buf)

{

	struct switchtec_dev *stdev = to_stdev(dev);



	return sprintf(buf, "%d\n", stdev->partition_count);

}

static DEVICE_ATTR_RO(partition_count);



static struct attribute *switchtec_device_attrs[] = {

	&dev_attr_device_version.attr,

	&dev_attr_fw_version.attr,

	&dev_attr_vendor_id.attr,

	&dev_attr_product_id.attr,

	&dev_attr_product_revision.attr,

	&dev_attr_component_vendor.attr,

	&dev_attr_component_id.attr,

	&dev_attr_component_revision.attr,

	&dev_attr_partition.attr,

	&dev_attr_partition_count.attr,

	NULL,

};



ATTRIBUTE_GROUPS(switchtec_device);



static int switchtec_dev_open(struct inode *inode, struct file *filp)

{

	struct switchtec_dev *stdev;
@@ -734,6 +846,7 @@ static struct switchtec_dev *stdev_create(struct pci_dev *pdev) 
	device_initialize(dev);

	dev->class = switchtec_class;

	dev->parent = &pdev->dev;

	dev->groups = switchtec_device_groups;

	dev->release = stdev_release;



	minor = ida_simple_get(&switchtec_minor_ida, 0, 0,