Add host/device hibernation functions which must be wrapped
by core's  dwc2_enter_hibernation()/dwc2_exit_hibernation()
functions.

Make dwc2_backup_global_registers dwc2_restore_global_register
non-static to use them in both host/gadget sides.

Added function names:
dwc2_gadget_enter_hibernation()
dwc2_gadget_exit_hibernation()
dwc2_host_enter_hibernation()
dwc2_host_exit_hibernation()
Signed-off-by: Vardan Mikayelyan <mvardan@synopsys.com>
Signed-off-by: John Youn <johnyoun@synopsys.com>
Signed-off-by: Artur Petrosyan <arturp@synopsys.com>
Signed-off-by: Minas Harutyunyan <hminas@synopsys.com>
Signed-off-by: Grigor Tovmasyan <tovmasya@synopsys.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

Add common (host/device) helper functions, which will be called while
exiting from hibernation, from both sides.

dwc2_restore_essential_regs()
dwc2_hib_restore_common()
Signed-off-by: Vardan Mikayelyan <mvardan@synopsys.com>
Signed-off-by: John Youn <johnyoun@synopsys.com>
Signed-off-by: Artur Petrosyan <arturp@synopsys.com>
Signed-off-by: Minas Harutyunyan <hminas@synopsys.com>
Signed-off-by: Grigor Tovmasyan <tovmasya@synopsys.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

Move hptxfsiz to host register's backup/restore functions, not
needed to have it in global register's backup/restore functions.

Add backup for glpmcfg, and read/write for gi2cctl and pcgcctl.
As requires programming guide.

Affected functions:
dwc2_backup_host_registers()
dwc2_restore_host_registers()
dwc2_backup_global_registers()
dwc2_restore_global_registers()
Signed-off-by: Vardan Mikayelyan <mvardan@synopsys.com>
Signed-off-by: John Youn <johnyoun@synopsys.com>
Signed-off-by: Grigor Tovmasyan <tovmasya@synopsys.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

It will be set once corresponding set_feature command comes.

True if device is allowed to wake-up host by remote-wakeup
signalling.

This is preparation for remote wake-up support implementation,
it will not be implemented until gadget stack provide interface
for bringing remote wake-up signalling.
Signed-off-by: Vardan Mikayelyan <mvardan@synopsys.com>
Signed-off-by: John Youn <johnyoun@synopsys.com>
Signed-off-by: Grigor Tovmasyan <tovmasya@synopsys.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

Added a flag to indicate that core is in hibernation,
it is used to determine the hibernation state of the core.
Signed-off-by: Vardan Mikayelyan <mvardan@synopsys.com>
Signed-off-by: John Youn <johnyoun@synopsys.com>
Signed-off-by: Grigor Tovmasyan <tovmasya@synopsys.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

Add parameter remote_wakeup to dwc2_restore_device_registers()
to be able to restore device registers according to programming
guide for dwc-otg. It says that in case of rem_wakeup DCTL must not
be restored here.

Remove setting of DCTL_PWRONPRGDONE from this function, because it
will be done in function responsible for exiting from hibernation.

WA for enabled EPx's IN and OUT in DDMA mode. On entering to
hibernation wrong value read and saved from DIEPDMAx,
as result BNA interrupt asserted on hibernation exit
by restoring from saved area.
Signed-off-by: Vardan Mikayelyan <mvardan@synopsys.com>
Signed-off-by: John Youn <johnyoun@synopsys.com>
Signed-off-by: Artur Petrosyan <arturp@synopsys.com>
Signed-off-by: Minas Harutyunyan <hminas@synopsys.com>
Signed-off-by: Grigor Tovmasyan <tovmasya@synopsys.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

Moved dtxfsiz from dwc2_gregs_backup to dwc2_dregs_backup,
because it is device register.
Signed-off-by: Vardan Mikayelyan <mvardan@synopsys.com>
Signed-off-by: John Youn <johnyoun@synopsys.com>
Signed-off-by: Grigor Tovmasyan <tovmasya@synopsys.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

Add parameter and it's initialization, needed for hibernation.

Reimplement dwc2_set_param_power_down() to support hibernation too.
Now 'power_down' parameter can be initialized with 0, 1 or 2.
0 - No
1 - Partial power down
2 - Hibernation
Signed-off-by: Vardan Mikayelyan <mvardan@synopsys.com>
Signed-off-by: John Youn <johnyoun@synopsys.com>
Signed-off-by: Grigor Tovmasyan <tovmasya@synopsys.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

No-op change, only rename.

This code was misnamed originally. It was only responsible for partial
power down and not for hibernation.

Rename core_params->hibernation to core_params->power_down,
dwc2_set_param_hibernation() to dwc2_set_param_power_down().
Signed-off-by: Vardan Mikayelyan <mvardan@synopsys.com>
Signed-off-by: John Youn <johnyoun@synopsys.com>
Signed-off-by: Grigor Tovmasyan <tovmasya@synopsys.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

Set 'lpm_capable' flag in the gadget structure so
indicating that LPM is supported.
Signed-off-by: John Youn <johnyoun@synopsys.com>
Signed-off-by: Sevak Arakelyan <sevaka@synopsys.com>
Signed-off-by: Grigor Tovmasyan <tovmasya@synopsys.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

This is useful on platforms (e.g. TI AM437x) that don't
have ID available on a GPIO but do have the OTG block.

We can obtain the ID state via the OTG block and use it
for dual-role switching.
Signed-off-by: Roger Quadros <rogerq@ti.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

This fixes "utmi_phy_clk_enable: timeout waiting for phy to stabilize"
error message.
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

The nop_reset and shutdown methods are called in a context that can sleep,
so use gpiod_set_value_cansleep instead of gpiod_set_value.

If you've connected the reset line to a GPIO expander, you'd get a kernel
"slowpath" warning with gpiod_set_value.
Signed-off-by: Mike Looijmans <mike.looijmans@topic.nl>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

The show() method should use scnprintf() not snprintf() because snprintf()
may returns a value that exceeds its second argument.
Signed-off-by: Jaejoong Kim <climbbb.kim@gmail.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

We don't support PRTCAP == OTG yet, so prevent user from
setting it via debugfs.

Fixes: 41ce1456 ("usb: dwc3: core: make dwc3_set_mode() work properly")
Cc: <stable@vger.kernel.org> # v4.12+
Signed-off-by: Roger Quadros <rogerq@ti.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

Add OTG and GHWPARAMS6 register definitions
Signed-off-by: Roger Quadros <rogerq@ti.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

Amlogic Meson GXL and AXG SoCs come with a (host-only) dwc3 USB
controller. To use this controller a clock has to be enabled and a reset
line has to be pulsed.
Enabling the clock works identical to other SoCs. However, the reset
line has to be pulsed (using reset_control_reset) instead of using a
level reset (reset_control_{assert,deassert}).
Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Tested-by: Yixun Lan <yixun.lan@amlogic.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

Some SoCs (such as Amlogic Meson GXL for example) share the reset line
with other components (in case of the Meson GXL example there's a shared
reset line between the USB2 PHYs, USB3 PHYs and the dwc3 controller).
Additionally SoC implementations may prefer a reset pulse over level
resets.

For now this falls back to the old defaults, which are:
- reset lines are exclusive
- level resets are being used
Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Tested-by: Yixun Lan <yixun.lan@amlogic.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

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: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Tested-by: Yixun Lan <yixun.lan@amlogic.com>
Signed-off-by: Felipe 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: John Youn <johnyoun@synopsys.com>
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Signed-off-by: Felipe 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: Grigor Tovmasyan <tovmasya@synopsys.com>
Signed-off-by: Felipe 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: Grigor Tovmasyan <tovmasya@synopsys.com>
Signed-off-by: Felipe 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: Sevak Arakelyan <sevaka@synopsys.com>
Signed-off-by: Grigor Tovmasyan <tovmasya@synopsys.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

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

Make field names of GLPMCFG register in definitions to be
the same with the databook.
Signed-off-by: Sevak Arakelyan <sevaka@synopsys.com>
Signed-off-by: Grigor Tovmasyan <tovmasya@synopsys.com>
Signed-off-by: Felipe 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: Razmik Karapetyan <razmik@synopsys.com>
Signed-off-by: Grigor Tovmasyan <tovmasya@synopsys.com>
Signed-off-by: Felipe 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: Razmik Karapetyan <razmik@synopsys.com>
Signed-off-by: Grigor Tovmasyan <tovmasya@synopsys.com>
Signed-off-by: Felipe 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: Stefan Wahren <stefan.wahren@i2se.com>
Signed-off-by: Felipe 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: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Ludovic Desroches <ludovic.desroches@microchip.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

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

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

Use devm_kzalloc() and remove the unnecessary kfree().
Acked-by: John Youn <johnyoun@synopsys.com>
Signed-off-by: Vardan Mikayelyan <mvardan@synopsys.com>
Signed-off-by: John Youn <johnyoun@synopsys.com>
Signed-off-by: Grigor Tovmasyan <tovmasya@synopsys.com>
Signed-off-by: Felipe 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: John Youn <johnyoun@synopsys.com>
Signed-off-by: Minas Harutyunyan <hminas@synopsys.com>
Signed-off-by: Grigor Tovmasyan <tovmasya@synopsys.com>
Signed-off-by: Felipe 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: John Youn <johnyoun@synopsys.com>
Signed-off-by: Minas Harutyunyan <hminas@synopsys.com>
Signed-off-by: Grigor Tovmasyan <tovmasya@synopsys.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>