u-boot.git/include/usb.h, branch v2015.07

usb.h: Always declare usb function prototypes

2015-06-19T12:32:12+00:00

There is no harm in declaring the function prototypes even if nothing
implements them, and when CONFIG_DM_USB=y the various usb functions are
available regardless of any controller drivers being enabled.

This fixes compile warnings due to missing prototypes on ARCHs where
the ARCH Kconfig always enables CONFIG_DM_USB and various usb drivers.

One could argue that in the case of no controllers CONFIG_DM_USB should not
be set, but this problem is typically seen during bringup of boards which
do actually have usb controllers.

Signed-off-by: Hans de Goede

usb: add device connection/disconnection detection

2015-05-15T00:49:33+00:00

Provide a function to detect USB device insertion/removal in order to
avoid having to do USB enumeration in a tight loop when trying to detect
peripheral hotplugging.

Signed-off-by: Vincent Palatin 

Reviewed-by: Stefan Reinauer 
Tested-by: Stefan Reinauer 
Signed-off-by: Simon Glass

dm: usb: Add support for companion controllers

2015-05-15T00:49:31+00:00

USB companion controllers must be scanned after the main controller has
been scanned, so that any devices which the main controller which to hand
over to the companion have actually been handed over before we scan the
companion.

As there are no guarantees that this will magically happen in the right
order, split the scanning of the buses in 2 phases, first main controllers,
and then companion controllers.

Signed-off-by: Hans de Goede 
Acked-by: Simon Glass

dm: usb: Add support for interrupt queues to the dm usb code

2015-05-15T00:49:31+00:00

Interrupt endpoints typically are polled for a long time by the usb
controller before they return anything, so calls to submit_int_msg() can
take a long time to complete this.

To avoid this the u-boot code has the an interrupt queue mechanism / API,
add support for this to the driver-model usb code and implement it for the
dm ehci code.

See the added doc comments for more details.

Signed-off-by: Hans de Goede 
Acked-by: Simon Glass

dm: usb: Copy over usb_device values from usb_scan_device() to final usb_device

2015-05-06T02:58:41+00:00

Currently we copy over a number of usb_device values stored in the on stack
struct usb_device probed in usb_scan_device() to the final driver-model managed
struct usb_device in usb_child_pre_probe() through usb_device_platdata, and
then call usb_select_config() to fill in the rest.

There are 3 problems with this approach:

1) It does not fill in enough fields before calling usb_select_config(),
specifically it does not fill in ep0's maxpacketsize causing a div by zero
exception in the ehci driver.

2) It unnecessarily redoes a number of usb requests making usb probing slower

3) Calling usb_select_config() a second time fails on some usb-1 devices
plugged into usb-2 hubs, causing u-boot to not recognize these devices.

This commit fixes these issues by removing (*) the usb_select_config() call
from usb_child_pre_probe(), and instead of copying over things field by field
through usb_device_platdata, store a pointer to the in stack usb_device
(which is still valid when usb_child_pre_probe() gets called) and copy
over the entire struct.

*) Except for devices which are explictly instantiated through device-tree
rather then discovered through usb_scan_device() such as emulated usb devices
in the sandbox.

Signed-off-by: Hans de Goede 
Acked-by: Simon Glass

dm: usb: Make usb_get_bus easier to use for callers

2015-05-06T02:58:41+00:00

Make usb_get_bus easier to use for callers, by directly returning the bus
rather then returning it via a pass-by-ref argument.

This also removes the error checking from the current callers, as
we already have an assert() for bus not being NULL in usb_get_bus().

Signed-off-by: Hans de Goede 
Acked-by: Simon Glass

dm: usb: sandbox: Add a uclass for USB device emulation

2015-04-18T17:11:26+00:00

With sandbox we want to be able to emulate USB devices so that we can test
the USB stack. Add a uclass to support this. It implements the same
operations as a normal USB device driver, but in this case passes them on
to an emulation driver.

Signed-off-by: Simon Glass 
Reviewed-by: Marek Vasut

dm: usb: Allow USB drivers to be declared and auto-probed

2015-04-18T17:11:25+00:00

USB devices in U-Boot are currently probed only after all devices have
been enumerated. Each type of device is probed by custom code, e.g.:

- USB storage
- Keyboard
- Ethernet

With driver model this approach doesn't work very well. We could build
a picture of the bus and then go back and add the devices later, but
this means that the data structures are incomplete for quite a while.
It also does not follow the model of being able to bind a device when we
discover it.

We would prefer to have devices automatically be bound as the device is
enumerated. This allows us to attach drivers to particular USB classes
or product/vendor IDs. This is the method used by Linux.

Add the required #defines from Linux, a way of declaring a USB driver and
the logic to locate the correct driver given the USB device's descriptors.

Signed-off-by: Simon Glass 
Reviewed-by: Marek Vasut

dm: usb: Refactor port resets

2015-04-18T17:11:20+00:00

Move the port reset code into its own function. Rename usb_hub_reset() to
indicate that is is now a legacy function.

Signed-off-by: Simon Glass 
Reviewed-by: Marek Vasut

dm: usb: Adjust usb_alloc_new_device() to return an error

2015-04-18T17:11:20+00:00

This function returns NULL on error at present. Adjust it so that we can
return a real error, as is needed with driver model. Also improve the
error handling in its caller, usb_hub_port_connect_change(), and adjust
the code order to prepare for driver model.

Signed-off-by: Simon Glass 
Reviewed-by: Marek Vasut