Amlogic Meson GX SoCs (GXL and AXG) come with a (host-only) dwc3 USB
controller. This requires a clock to be enabled and a reset line to be
pulsed to get the hardware into a known state.
Add the documentation for this IP block, similar to "qcom,dwc3.txt".
Signed-off-by: NMartin Blumenstingl <martin.blumenstingl@googlemail.com>
Reviewed-by: NRob Herring <robh@kernel.org>
Tested-by: NYixun Lan <yixun.lan@amlogic.com>
Signed-off-by: NFelipe Balbi <felipe.balbi@linux.intel.com>

Assign true or false to boolean variables instead of an integer value.

This issue was detected with the help of Coccinelle.
Acked-by: NJohn Youn <johnyoun@synopsys.com>
Signed-off-by: NGustavo A. R. Silva <gustavo@embeddedor.com>
Signed-off-by: NFelipe Balbi <felipe.balbi@linux.intel.com>

Added core state checking in dwc2_hsotg_ep_queue() function
to make sure that application will submit requests only in L0 state.
Signed-off-by: NGrigor Tovmasyan <tovmasya@synopsys.com>
Signed-off-by: NFelipe Balbi <felipe.balbi@linux.intel.com>

Added call_gadget() function call when entering to L1 state
to inform gadget that core is in L1 state.

Did the same thing when exiting from L1 state
to inform gadget that core is in L0 state.
Signed-off-by: NGrigor Tovmasyan <tovmasya@synopsys.com>
Signed-off-by: NFelipe Balbi <felipe.balbi@linux.intel.com>

Configure core in device mode to support LPM according to
programming guide.
Device will start giving valid responses for LPM tokens.
After this patch device side LPM will start working.
Signed-off-by: NSevak Arakelyan <sevaka@synopsys.com>
Signed-off-by: NGrigor Tovmasyan <tovmasya@synopsys.com>
Signed-off-by: NFelipe Balbi <felipe.balbi@linux.intel.com>

Enable "LPM Transaction Received" interrupt for receive an
interrupt when host will send LPM token.
Signed-off-by: NSevak Arakelyan <sevaka@synopsys.com>
Signed-off-by: NGrigor Tovmasyan <tovmasya@synopsys.com>
Signed-off-by: NFelipe Balbi <felipe.balbi@linux.intel.com>

This interrupt indicates that an LPM transaction
was received on the USB bus. After getting this
interrupt we are going from L0 state to L1 state.
Signed-off-by: NSevak Arakelyan <sevaka@synopsys.com>
Signed-off-by: NGrigor Tovmasyan <tovmasya@synopsys.com>
Signed-off-by: NFelipe Balbi <felipe.balbi@linux.intel.com>

Add a function which will be called if device is in L1 sleep state
and Resume/Remote Wakeup Detected interrupt is asserted.
Signed-off-by: NSevak Arakelyan <sevaka@synopsys.com>
Signed-off-by: NGrigor Tovmasyan <tovmasya@synopsys.com>
Signed-off-by: NFelipe Balbi <felipe.balbi@linux.intel.com>

Add lpm, lpm_clock_gating, besl, hird_threshold_en and hird_threshold
core parameters. These will indicate LPM and LPM Errata support
as well as chosen L1 sleeping mode for the core and PHY.
Signed-off-by: NSevak Arakelyan <sevaka@synopsys.com>
Signed-off-by: NGrigor Tovmasyan <tovmasya@synopsys.com>
Signed-off-by: NFelipe Balbi <felipe.balbi@linux.intel.com>

Make field names of GLPMCFG register in definitions to be
the same with the databook.
Signed-off-by: NSevak Arakelyan <sevaka@synopsys.com>
Signed-off-by: NGrigor Tovmasyan <tovmasya@synopsys.com>
Signed-off-by: NFelipe Balbi <felipe.balbi@linux.intel.com>

Backup PCGCCTL1 register when entering hibernation mode and
restore it after exiting from hibernation, to keep active ACG
feature.
Signed-off-by: NRazmik Karapetyan <razmik@synopsys.com>
Signed-off-by: NGrigor Tovmasyan <tovmasya@synopsys.com>
Signed-off-by: NFelipe Balbi <felipe.balbi@linux.intel.com>

Added function for supporting Active Clock Gating functionality
in the driver.

PCGCCTL1 (Power and Clock Control) register will be used
for controlling the core`s active clock gating feature, and
the previously reserved 12th bit in GHWCFG4 now indicates that the
controller supports the Dynamic Power Reduction (Active Clock Gating)
during no traffic scenarios such as L0, idle, resume and suspend
states.

dwc2_enable_acg() function sets GATEEN bit in PCGCCTL1 register
and enables ACG, if it supported.

According to ACG functional specification, enabling of ACG feature
in host mode done in host initialization, before turning Vbus on,
specifically in dwc2_core_host_init function.

Enabling of ACG feature in device mode done in device initialization,
before clearing the SftDiscon bit in DCTL.
This bit was cleared in dwc2_hsotg_core_connect() function.So
dwc2_enable_acg() called before dwc2_core_connect() calls.
Signed-off-by: NRazmik Karapetyan <razmik@synopsys.com>
Signed-off-by: NGrigor Tovmasyan <tovmasya@synopsys.com>
Signed-off-by: NFelipe Balbi <felipe.balbi@linux.intel.com>

We better print an error in case probing of dwc2 fails on
setting the DMA coherent mask.
Signed-off-by: NStefan Wahren <stefan.wahren@i2se.com>
Signed-off-by: NFelipe Balbi <felipe.balbi@linux.intel.com>

Use GPIO descriptors instead of relying on the old method.
Include irq.h header since it is needed and was indirectly
included through of_gpio.h.
Reviewed-by: NLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: NLudovic Desroches <ludovic.desroches@microchip.com>
Signed-off-by: NFelipe Balbi <felipe.balbi@linux.intel.com>

With the removal of AVR platforms, code related to platform stuff
is useless.
Signed-off-by: NLudovic Desroches <ludovic.desroches@microchip.com>
Signed-off-by: NFelipe Balbi <felipe.balbi@linux.intel.com>

The maximum value that unsigned char can hold is 255, meanwhile
the maximum value of interval is  2^(bIntervalMax-1)=2^15.
Signed-off-by: NGrigor Tovmasyan <tovmasya@synopsys.com>
Signed-off-by: NFelipe Balbi <felipe.balbi@linux.intel.com>

The probe function doesn't properly handle errors. Fix it so that it
properly handles cleanup.
Acked-by: NJohn Youn <johnyoun@synopsys.com>
Signed-off-by: NVardan Mikayelyan <mvardan@synopsys.com>
Signed-off-by: NJohn Youn <johnyoun@synopsys.com>
Signed-off-by: NGrigor Tovmasyan <tovmasya@synopsys.com>
Signed-off-by: NFelipe Balbi <felipe.balbi@linux.intel.com>

After platform_device_add(), if we error out, we must do
platform_device_unregister(), which also does the put. So lets move
devm_kzalloc() to simplify error handling and avoid calling of
platform_device_unregister().
Acked-by: NJohn Youn <johnyoun@synopsys.com>
Signed-off-by: NVardan Mikayelyan <mvardan@synopsys.com>
Signed-off-by: NJohn Youn <johnyoun@synopsys.com>
Signed-off-by: NGrigor Tovmasyan <tovmasya@synopsys.com>
Signed-off-by: NFelipe Balbi <felipe.balbi@linux.intel.com>

Move usb_phy_generic_register() function call to the top, to simplify
error handling. If this fails we can simply return instead of cleaning
up.
Acked-by: NJohn Youn <johnyoun@synopsys.com>
Signed-off-by: NVardan Mikayelyan <mvardan@synopsys.com>
Signed-off-by: NJohn Youn <johnyoun@synopsys.com>
Signed-off-by: NGrigor Tovmasyan <tovmasya@synopsys.com>
Signed-off-by: NFelipe Balbi <felipe.balbi@linux.intel.com>

Use devm_kzalloc() and remove the unnecessary kfree().
Acked-by: NJohn Youn <johnyoun@synopsys.com>
Signed-off-by: NVardan Mikayelyan <mvardan@synopsys.com>
Signed-off-by: NJohn Youn <johnyoun@synopsys.com>
Signed-off-by: NGrigor Tovmasyan <tovmasya@synopsys.com>
Signed-off-by: NFelipe Balbi <felipe.balbi@linux.intel.com>

Before flushing fifos required to check AHB master state and
lush when AHB master is in IDLE state.
Acked-by: NJohn Youn <johnyoun@synopsys.com>
Signed-off-by: NMinas Harutyunyan <hminas@synopsys.com>
Signed-off-by: NGrigor Tovmasyan <tovmasya@synopsys.com>
Signed-off-by: NFelipe Balbi <felipe.balbi@linux.intel.com>

Added missing GUSBCFG programming in host mode, which fixes
transaction errors issue on HiKey and Altera Cyclone V boards.

These field even if was programmed in device mode (in function
dwc2_hsotg_core_init_disconnected()) will be resetting to POR values
after core soft reset applied.
So, each time when switching to host mode required to set this field
to correct value.
Acked-by: NJohn Youn <johnyoun@synopsys.com>
Signed-off-by: NMinas Harutyunyan <hminas@synopsys.com>
Signed-off-by: NGrigor Tovmasyan <tovmasya@synopsys.com>
Signed-off-by: NFelipe Balbi <felipe.balbi@linux.intel.com>

According databook in Buffer and External DMA mode
non-split periodic channels can't be halted.
Acked-by: NJohn Youn <johnyoun@synopsys.com>
Signed-off-by: NMinas Harutyunyan <hminas@synopsys.com>
Signed-off-by: NGrigor Tovmasyan <tovmasya@synopsys.com>
Signed-off-by: NFelipe Balbi <felipe.balbi@linux.intel.com>

Removed unnecessary debug prints about DMA mode for host side
from dwc2_gahbcfg_init() function.
Acked-by: NJohn Youn <johnyoun@synopsys.com>
Signed-off-by: NRazmik Karapetyan <razmik@synopsys.com>
Signed-off-by: NGrigor Tovmasyan <tovmasya@synopsys.com>
Signed-off-by: NFelipe Balbi <felipe.balbi@linux.intel.com>

Deleted dwc2_hcd_dump_frrem() function, because it used undefined
parameters from dwc2_hsotg structure. The function body was in #ifdef
statement and was never compiled.

Also removed that parameters from dwc2_hsotg structure, which were
used only in dwc2_hcd_dump_frrem() function.

And also delete dwc2_sample_frrem macro, because without
dwc2_hcd_dump_frrem() function it's lose its purpose.
Acked-by: NJohn Youn <johnyoun@synopsys.com>
Signed-off-by: NGrigor Tovmasyan <tovmasya@synopsys.com>
Signed-off-by: NFelipe Balbi <felipe.balbi@linux.intel.com>

Renamed __orr32 and __bic32 function names to more descriptive
dwc2_set_bit and dwc2_clear_bit respectively.
Acked-by: NJohn Youn <johnyoun@synopsys.com>
Signed-off-by: NRazmik Karapetyan <razmik@synopsys.com>
Signed-off-by: NGrigor Tovmasyan <tovmasya@synopsys.com>
Signed-off-by: NFelipe Balbi <felipe.balbi@linux.intel.com>

Disabled only unmasked endpoints based on DAINTMSK register.
This will allow to minimize GINTSTS_GOUTNAKEFF interrupt handling.
Acked-by: NJohn Youn <johnyoun@synopsys.com>
Signed-off-by: NRazmik Karapetyan <razmik@synopsys.com>
Signed-off-by: NMinas Harutyunyan <hminas@synopsys.com>
Signed-off-by: NGrigor Tovmasyan <tovmasya@synopsys.com>
Signed-off-by: NFelipe Balbi <felipe.balbi@linux.intel.com>

In 'for' loop skipped masked and non-ISOC EPs. Also breaked 'for' loop
after setting SGOUTNAK in DCTL,when one enabled EP was detected.

This will allow to minimize incomplete ISOC OUT interrupt handling.
Acked-by: NJohn Youn <johnyoun@synopsys.com>
Signed-off-by: NRazmik Karapetyan <razmik@synopsys.com>
Signed-off-by: NMinas Harutyunyan <hminas@synopsys.com>
Signed-off-by: NGrigor Tovmasyan <tovmasya@synopsys.com>
Signed-off-by: NFelipe Balbi <felipe.balbi@linux.intel.com>

Disabled only that ISOC endpoints,for which interrupt bit was set
in the DAINTMSK register. This will allow to minimize incomplete
ISOC IN interrupt handling.
Acked-by: NJohn Youn <johnyoun@synopsys.com>
Signed-off-by: NRazmik Karapetyan <razmik@synopsys.com>
Signed-off-by: NMinas Harutyunyan <hminas@synopsys.com>
Signed-off-by: NGrigor Tovmasyan <tovmasya@synopsys.com>
Signed-off-by: NFelipe Balbi <felipe.balbi@linux.intel.com>

Changed AHB burst size from INCR4 to INCR by default.
With this value driver shows excellent DMA performance.
Acked-by: NJohn Youn <johnyoun@synopsys.com>
Signed-off-by: NRazmik Karapetyan <razmik@synopsys.com>
Signed-off-by: NGrigor Tovmasyan <tovmasya@synopsys.com>
Signed-off-by: NFelipe Balbi <felipe.balbi@linux.intel.com>

In dwc2_hsotg_core_init_disconnected() function used AHB burst size
parameter, instead of calculating already calculated value.
Acked-by: NJohn Youn <johnyoun@synopsys.com>
Signed-off-by: NRazmik Karapetyan <razmik@synopsys.com>
Signed-off-by: NGrigor Tovmasyan <tovmasya@synopsys.com>
Signed-off-by: NFelipe Balbi <felipe.balbi@linux.intel.com>

Move dwc2_hsotg_wait_bit_set function to core.c so it can be used
anywhere in the code.

Added dwc2_hsotg_wait_bit_clear function in core.c.

Replace all the parts of register bit polling code with
dwc2_hsotg_wait_bit_set or dwc2_hsotg_wait_bit_clear functions
calls depends on code logic.
Acked-by: NJohn Youn <johnyoun@synopsys.com>
Signed-off-by: NSevak Arakelyan <sevaka@synopsys.com>
Signed-off-by: NGrigor Tovmasyan <tovmasya@synopsys.com>
Signed-off-by: NFelipe Balbi <felipe.balbi@linux.intel.com>

Only check the ID portion of the GSNPSID register and don’t check
the version. This will allow the driver to work with version 4.00a
and later of the DWC_hsotg IP.
Acked-by: NJohn Youn <johnyoun@synopsys.com>
Signed-off-by: NGevorg Sahakyan <sahakyan@synopsys.com>
Signed-off-by: NMinas Harutyunyan <hminas@synopsys.com>
Signed-off-by: NGrigor Tovmasyan <tovmasya@synopsys.com>
Signed-off-by: NFelipe Balbi <felipe.balbi@linux.intel.com>

Some UDC drivers (like the DWC3) expect that the response to a setup()
request is queued from within the setup function itself so that it is
available as soon as setup() has completed.

Upon receiving a setup request the function fs driver creates an event that
is made available to userspace. And only once userspace has acknowledged
that event the response to the setup request is queued.

So it violates the requirement of those UDC drivers and random failures can
be observed. This is basically a race condition and if userspace is able to
read the event and queue the response fast enough all is good. But if it is
not, for example because other processes are currently scheduled to run,
the USB host that sent the setup request will observe an error.

To avoid this the gadget framework provides the USB_GADGET_DELAYED_STATUS
return code. If a setup() callback returns this value the UDC driver is
aware that response is not yet available and can uses the appropriate
methods to handle this case.

Since in the case of function fs the response will never be available when
the setup() function returns make sure that this status code is used.

This fixed random occasional failures that were previously observed on a
DWC3 based system under high system load.
Signed-off-by: NLars-Peter Clausen <lars@metafoo.de>
Signed-off-by: NFelipe Balbi <felipe.balbi@linux.intel.com>

When using a AIO read() operation on the function FS gadget driver a URB is
submitted asynchronously and on URB completion the received data is copied
to the userspace buffer associated with the read operation.

This is done from a kernel worker thread invoking copy_to_user() (through
copy_to_iter()). And while the user space process memory is made available
to the kernel thread using use_mm(), some architecture require in addition
to this that the operation runs with USER_DS set. Otherwise the userspace
memory access will fail.

For example on ARM64 with Privileged Access Never (PAN) and User Access
Override (UAO) enabled the following crash occurs.

	Internal error: Accessing user space memory with fs=KERNEL_DS: 9600004f [#1] SMP
	Modules linked in:
	CPU: 2 PID: 1636 Comm: kworker/2:1 Not tainted 4.9.0-04081-g8ab2dfb-dirty #487
	Hardware name: ZynqMP ZCU102 Rev1.0 (DT)
	Workqueue: events ffs_user_copy_worker
	task: ffffffc87afc8080 task.stack: ffffffc87a00c000
	PC is at __arch_copy_to_user+0x190/0x220
	LR is at copy_to_iter+0x78/0x3c8
	[...]
	[<ffffff800847b790>] __arch_copy_to_user+0x190/0x220
	[<ffffff80086f25d8>] ffs_user_copy_worker+0x70/0x130
	[<ffffff80080b8c64>] process_one_work+0x1dc/0x460
	[<ffffff80080b8f38>] worker_thread+0x50/0x4b0
	[<ffffff80080bf5a0>] kthread+0xd8/0xf0
	[<ffffff8008083680>] ret_from_fork+0x10/0x50

Address this by placing a set_fs(USER_DS) before of the copy operation
and revert it again once the copy operation has finished.

This patch is analogous to commit d7ffde35 ("vhost: use USER_DS in
vhost_worker thread") which addresses the same underlying issue.
Signed-off-by: NLars-Peter Clausen <lars@metafoo.de>
Signed-off-by: NFelipe Balbi <felipe.balbi@linux.intel.com>

Increase max_speed of the mass_storage driver for UDCs that support
SuperSpeed Plus. The composite driver will pass this value to UDC core
to set the device speed on probe (actual speed may be different
depending on whether the USB controller supports it or other external
factors).
Signed-off-by: NThinh Nguyen <thinhn@synopsys.com>
Signed-off-by: NFelipe Balbi <felipe.balbi@linux.intel.com>

When the host wants to fetch OS descriptors, it sends two requests. The
first is only for the header and the second for the full amount
specified by the header in the first request. The OS descriptor handling
code is distinguishing the header-only requests based on the wLength of
the setup packet, but the same code is executed in both cases to
construct the actual header. Simplify this by always constructing the
header and then filling out the rest of the request if the wLength is
greater than the size of the header.

Also remove the duplicate code for queueing the request to ep0 by adding
a goto label.
Signed-off-by: NChris Dickens <christopher.a.dickens@gmail.com>
Signed-off-by: NFelipe Balbi <felipe.balbi@linux.intel.com>

When handling an OS descriptor request, one of the first operations is
to zero out the request buffer using the wLength from the setup packet.
There is no bounds checking, so a wLength > 4096 would clobber memory
adjacent to the request buffer. Fix this by taking the min of wLength
and the request buffer length prior to the memset. While at it, define
the buffer length in a header file so that magic numbers don't appear
throughout the code.

When returning data to the host, the data length should be the min of
the wLength and the valid data we have to return. Currently we are
returning wLength, thus requests for a wLength greater than the amount
of data in the OS descriptor buffer would return invalid (albeit zero'd)
data following the valid descriptor data. Fix this by counting the
number of bytes when constructing the data and using this when
determining the length of the request.
Signed-off-by: NChris Dickens <christopher.a.dickens@gmail.com>
Signed-off-by: NFelipe Balbi <felipe.balbi@linux.intel.com>

The irq is available in hsotg already, so there's no need to pass it as
separate function parameter.
Signed-off-by: NVardan Mikayelyan <mvardan@synopsys.com>
Signed-off-by: NGrigor Tovmasyan <tovmasya@synopsys.com>
Signed-off-by: NFelipe Balbi <felipe.balbi@linux.intel.com>

As devm_ioremap_resource() checks for valid resource,
make use of it instead of testing ourselves. As a bonus
memory region is requested.
Acked-by: NNicolas Ferre <nicolas.ferre@microchip.com>
Signed-off-by: NLadislav Michl <ladis@linux-mips.org>
Signed-off-by: NFelipe Balbi <felipe.balbi@linux.intel.com>