Commit 72246da4 authored by Felipe Balbi's avatar Felipe Balbi Committed by Greg Kroah-Hartman
Browse files

usb: Introduce DesignWare USB3 DRD Driver 

The DesignWare USB3 is a highly
configurable IP Core which can be
instantiated as Dual-Role Device (DRD),
Peripheral Only and Host Only (XHCI)
configurations.

Several other parameters can be configured
like amount of FIFO space, amount of TX and
RX endpoints, amount of Host Interrupters,
etc.

The current driver has been validated with
a virtual model of version 1.73a of that core
and with an FPGA burned with version 1.83a
of the DRD core. We have support for PCIe
bus, which is used on FPGA prototyping, and
for the OMAP5, more adaptation (or glue)
layers can be easily added and the driver
is half prepared to handle any possible
configuration the HW engineer has chosen
considering we have the information on
one of the GHWPARAMS registers to do
runtime checking of certain features.

More runtime checks can, and should, be added
in order to make this driver even more flexible
with regards to number of endpoints, FIFO sizes,
transfer types, etc.

While this supports only the device side, for
now, we will add support for Host side (xHCI -
see the updated series Sebastian has sent [1])
and OTG after we have it all stabilized.

[1] http://marc.info/?l=linux-usb&m=131341992020339&w=2



Signed-off-by: default avatarFelipe Balbi <balbi@ti.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent 500fdf8b

Documentation/usb/dwc3.txt

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 TODO

~~~~~~

Please pick something while reading :)



- Implement streaming support for BULK endpoints

  Tatyana's patch "usb: Add streams support to the gadget framework"

  introduces streaming support for the gadget driver.

  Every usb_request has new field called stream_id which holds its id.

  Every usb_ep has a field num_supported_strms which describes the max

  number of streams supported (for this ep).

  UAS is AFAIK the only gadget with streaming support.



- Convert interrupt handler to per-ep-thread-irq



  As it turns out some DWC3-commands ~1ms to complete. Currently we spin

  until the command completes which is bad.



  Implementation idea:

  - dwc core implements a demultiplexing irq chip for interrupts per

    endpoint. The interrupt numbers are allocated during probe and belong

    to the device. If MSI provides per-endpoint interrupt this dummy

    interrupt chip can be replaced with "real" interrupts.

  - interrupts are requested / allocated on usb_ep_enable() and removed on

    usb_ep_disable(). Worst case are 32 interrupts, the lower limit is two

    for ep0/1.

  - dwc3_send_gadget_ep_cmd() will sleep in wait_for_completion_timeout()

    until the command completes.

  - the interrupt handler is split into the following pieces:

    - primary handler of the device

      goes through every event and calls generic_handle_irq() for event

      it. On return from generic_handle_irq() in acknowledges the event

      counter so interrupt goes away (eventually).



    - threaded handler of the device

      none



    - primary handler of the EP-interrupt

      reads the event and tries to process it. Everything that requries

      sleeping is handed over to the Thread. The event is saved in an

      per-endpoint data-structure.

      We probably have to pay attention not to process events once we

      handed something to thread so we don't process event X prio Y

      where X > Y.



    - threaded handler of the EP-interrupt

      handles the remaining EP work which might sleep such as waiting

      for command completion.



  Latency:

   There should be no increase in latency since the interrupt-thread has a

   high priority and will be run before an average task in user land

   (except the user changed priorities).

drivers/usb/Kconfig

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@@ -111,6 +111,8 @@ config USB 


source "drivers/usb/core/Kconfig"



source "drivers/usb/dwc3/Kconfig"



source "drivers/usb/mon/Kconfig"



source "drivers/usb/wusbcore/Kconfig"

drivers/usb/Makefile

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@@ -6,6 +6,8 @@ 


obj-$(CONFIG_USB)		+= core/



obj-$(CONFIG_USB_DWC3)		+= dwc3/



obj-$(CONFIG_USB_MON)		+= mon/



obj-$(CONFIG_PCI)		+= host/

drivers/usb/dwc3/Kconfig

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config USB_DWC3

	tristate "DesignWare USB3 DRD Core Support"

	depends on (USB || USB_GADGET)

	select USB_OTG_UTILS

	help

	  Say Y or M here if your system has a Dual Role SuperSpeed

	  USB controller based on the DesignWare USB3 IP Core.



	  If you choose to build this driver is a dynamically linked

	  module, the module will be called dwc3.ko.



if USB_DWC3



config USB_DWC3_DEBUG

	bool "Enable Debugging Messages"

	help

	  Say Y here to enable debugging messages on DWC3 Driver.



config USB_DWC3_VERBOSE

	bool "Enable Verbose Debugging Messages"

	depends on USB_DWC3_DEBUG

	help

	  Say Y here to enable verbose debugging messages on DWC3 Driver.



endif

drivers/usb/dwc3/Makefile

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ccflags-$(CONFIG_USB_DWC3_DEBUG)	:= -DDEBUG

ccflags-$(CONFIG_USB_DWC3_VERBOSE)	+= -DVERBOSE_DEBUG



obj-$(CONFIG_USB_DWC3)			+= dwc3.o



dwc3-y					:= core.o



ifneq ($(CONFIG_USB_GADGET_DWC3),)

	dwc3-y				+= gadget.o ep0.o

endif



ifneq ($(CONFIG_DEBUG_FS),)

	dwc3-y				+= debugfs.o

endif



##

# Platform-specific glue layers go here

#

# NOTICE: Make sure your glue layer doesn't depend on anything

# which is arch-specific and that it compiles on all situations.

#

# We want to keep this requirement in order to be able to compile

# the entire driver (with all its glue layers) on several architectures

# and make sure it compiles fine. This will also help with allmodconfig

# and allyesconfig builds.

#

# The only exception is the PCI glue layer, but that's only because

# PCI doesn't provide nops if CONFIG_PCI isn't enabled.

##



obj-$(CONFIG_USB_DWC3)		+= dwc3-omap.o



ifneq ($(CONFIG_PCI),)

	obj-$(CONFIG_USB_DWC3)		+= dwc3-pci.o

endif

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