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authorAlexandre Bounine2014-04-08 00:38:56 +0200
committerLinus Torvalds2014-04-08 01:36:07 +0200
commit2aaf308b95b24649a6dcfed89cd956e972089b2a (patch)
treea8fdaea74d50c4a38633bd7aafdc8a98723b1628 /drivers/rapidio/rio-driver.c
parentdrivers/rapidio/devices/tsi721_dma.c: optimize use of BDMA descriptors (diff)
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rapidio: rework device hierarchy and introduce mport class of devices
This patch removes an artificial RapidIO bus root device and establishes actual device hierarchy by providing reference to real parent devices. It also introduces device class for RapidIO controller devices (on-chip or an eternal bridge, known as "mport"). Existing implementation was sufficient for SoC-based platforms that have a single RapidIO controller. With introduction of devices using multiple RapidIO controllers and PCIe-to-RapidIO bridges the old scheme is very limiting or does not work at all. The implemented changes allow to properly reference platform's local RapidIO mport devices and provide device details needed for upper layers. This change to RapidIO device hierarchy does not break any known existing kernel or user space interfaces. Signed-off-by: Alexandre Bounine <alexandre.bounine@idt.com> Cc: Matt Porter <mporter@kernel.crashing.org> Cc: Li Yang <leoli@freescale.com> Cc: Kumar Gala <galak@kernel.crashing.org> Cc: Andre van Herk <andre.van.herk@prodrive-technologies.com> Cc: Stef van Os <stef.van.os@prodrive-technologies.com> Cc: Jerry Jacobs <jerry.jacobs@prodrive-technologies.com> Cc: Arno Tiemersma <arno.tiemersma@prodrive-technologies.com> Cc: Rob Landley <rob@landley.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/rapidio/rio-driver.c')
-rw-r--r--drivers/rapidio/rio-driver.c22
1 files changed, 15 insertions, 7 deletions
diff --git a/drivers/rapidio/rio-driver.c b/drivers/rapidio/rio-driver.c
index c9ae692d3451..f301f059bb85 100644
--- a/drivers/rapidio/rio-driver.c
+++ b/drivers/rapidio/rio-driver.c
@@ -167,7 +167,6 @@ void rio_unregister_driver(struct rio_driver *rdrv)
void rio_attach_device(struct rio_dev *rdev)
{
rdev->dev.bus = &rio_bus_type;
- rdev->dev.parent = &rio_bus;
}
EXPORT_SYMBOL_GPL(rio_attach_device);
@@ -216,9 +215,12 @@ static int rio_uevent(struct device *dev, struct kobj_uevent_env *env)
return 0;
}
-struct device rio_bus = {
- .init_name = "rapidio",
+struct class rio_mport_class = {
+ .name = "rapidio_port",
+ .owner = THIS_MODULE,
+ .dev_groups = rio_mport_groups,
};
+EXPORT_SYMBOL_GPL(rio_mport_class);
struct bus_type rio_bus_type = {
.name = "rapidio",
@@ -233,14 +235,20 @@ struct bus_type rio_bus_type = {
/**
* rio_bus_init - Register the RapidIO bus with the device model
*
- * Registers the RIO bus device and RIO bus type with the Linux
+ * Registers the RIO mport device class and RIO bus type with the Linux
* device model.
*/
static int __init rio_bus_init(void)
{
- if (device_register(&rio_bus) < 0)
- printk("RIO: failed to register RIO bus device\n");
- return bus_register(&rio_bus_type);
+ int ret;
+
+ ret = class_register(&rio_mport_class);
+ if (!ret) {
+ ret = bus_register(&rio_bus_type);
+ if (ret)
+ class_unregister(&rio_mport_class);
+ }
+ return ret;
}
postcore_initcall(rio_bus_init);