To dump internal LSP and endpoint state debug registers, we must write
to GDBGLSPMUX register. This patch correctly dump LSP and endpoint
states from the debug registers.

If the controller is in device mode, all LSP and endpoint state
registers will be dumped via the debugfs attribute "lsp_dump". In host
mode, the user has to write the LSP number to "lsp_dump" to dump a
specific LSP selection.

Fixes: 80b77634 ("usb: dwc3: Dump LSP and BMU debug info")
Signed-off-by: NThinh Nguyen <thinhn@synopsys.com>
Signed-off-by: NFelipe Balbi <felipe.balbi@linux.intel.com>

The Tx/RxFIFO types in the GDBGFIFOSPACE.FIFO_QUEUE_SELECT are not
queue. Properly rename them.
Signed-off-by: NThinh Nguyen <thinhn@synopsys.com>
Signed-off-by: NFelipe Balbi <felipe.balbi@linux.intel.com>

By default when core sees any transaction error (CRC or overflow) it
replies with terminating retry ACK (Retry=1 and Nump == 0).

Enabling this Auto Retry feature in controller will make the core send
a non-terminanting ACK upon such transaction errors. That is, ACK TP
with Retry=1 and Nump != 0.

Doing so will give controller a chance to recover from transient error
conditions.
Signed-off-by: NAnurag Kumar Vulisha <anurag.kumar.vulisha@xilinx.com>
Signed-off-by: NFelipe Balbi <felipe.balbi@linux.intel.com>

Enable the undefined length INCR burst type and set INCRx.
Different platform may has the different burst size type.
In order to get best performance, we need to tune the burst
size to one special value, instead of the default value.
Signed-off-by: NChangming Huang <jerry.huang@nxp.com>
Signed-off-by: NRan Wang <ran.wang_1@nxp.com>
Signed-off-by: NPengbo Mu <pengbo.mu@nxp.com>
Signed-off-by: NFelipe Balbi <felipe.balbi@linux.intel.com>

Add the macro definition for global soc bus configuration
register 0
Signed-off-by: NChangming Huang <jerry.huang@nxp.com>
Signed-off-by: NRan Wang <ran.wang_1@nxp.com>
Signed-off-by: NPengbo Mu <pengbo.mu@nxp.com>
Signed-off-by: NFelipe Balbi <felipe.balbi@linux.intel.com>

Now, this part of the code is duplicated and brings no extra value to
the driver. Let's remove it.
Signed-off-by: NFelipe Balbi <felipe.balbi@linux.intel.com>

In case we get an event with status set to Missed Isoc, this means we
have missed an isochronous interval and should issue End Transfer
command and wait for the following XferNotReady.

Let's do that early, rather than late.
Signed-off-by: NFelipe Balbi <felipe.balbi@linux.intel.com>

It has no use anymore.
Signed-off-by: NFelipe Balbi <felipe.balbi@linux.intel.com>

That has never proven useful in any way. Just remove it.
Signed-off-by: NFelipe Balbi <felipe.balbi@linux.intel.com>

The present code correctly fetches the req which were previously not
queued from the started_list but fails to continue queuing from the sg
where it previously stopped queuing (because of the unavailable TRB's).
This patch correct's the code to continue queuing from the correct sg
present in the sglist.

For example, consider 5 sgs in req. Because of limited TRB's among the
5 sgs only 3 got queued. This patch corrects the code to start queuing
from correct sg i.e 4th sg when the TRBs are available.
Signed-off-by: NAnurag Kumar Vulisha <anuragku@xilinx.com>
Signed-off-by: NFelipe Balbi <felipe.balbi@linux.intel.com>

The code logic in dwc3_prepare_one_trb() incorrectly uses the address
and length fields present in req packet for mapping TRB's instead of
using the address and length fields of scattergather lists. This patch
correct's the code to use sg->address and sg->length when scattergather
lists are present.
Signed-off-by: NAnurag Kumar Vulisha <anuragku@xilinx.com>
Signed-off-by: NFelipe Balbi <felipe.balbi@linux.intel.com>

Historically, the clocks and resets are handled on the glue layer
side instead of the DWC3 core.  For simple cases, dwc3-of-simple.c
takes care of arbitrary number of clocks and resets.  The DT node
structure typically looks like as follows:

  dwc3-glue {
          compatible = "foo,dwc3";
          clocks = ...;
          resets = ...;
          ...

          dwc3 {
                  compatible = "snps,dwc3";
                  ...
          };
  }

By supporting the clocks and the reset in the dwc3/core.c, it will
be turned into a single node:

  dwc3 {
          compatible = "foo,dwc3", "snps,dwc3";
          clocks = ...;
          resets = ...;
          ...
  }

This commit adds the binding of clocks and resets specific to this IP.
The number of clocks should generally be the same across SoCs, it is
just some SoCs either tie clocks together or do not provide software
control of some of the clocks.

I took the clock names from the Synopsys datasheet: "ref" (ref_clk),
"bus_early" (bus_clk_early), and "suspend" (suspend_clk).

I found only one reset line in the datasheet, hence the reset-names
property is omitted.

Those clocks are required for new platforms.  Enforcing the new
binding breaks existing platforms since they specify clocks (and
resets) in their glue layer node, but nothing in the core node.
I listed such exceptional cases in the DT binding.  The driver
code has been relaxed to accept no clock.  This change is based
on the discussion [1].

I inserted reset_control_deassert() and clk_bulk_enable() before the
first register access, i.e. dwc3_cache_hwparams().

[1] https://patchwork.kernel.org/patch/10284265/Signed-off-by: NMasahiro Yamada <yamada.masahiro@socionext.com>
Reviewed-by: NRob Herring <robh@kernel.org>
Signed-off-by: NFelipe Balbi <felipe.balbi@linux.intel.com>

Dump LSP and BMU debug info.
Signed-off-by: NThinh Nguyen <thinhn@synopsys.com>
Signed-off-by: NFelipe Balbi <felipe.balbi@linux.intel.com>

Check and configure TX/RX threshold for DWC_usb31. Update dwc3 structure
with new fields to store these threshold configurations.
Signed-off-by: NThinh Nguyen <thinhn@synopsys.com>
Signed-off-by: NFelipe Balbi <felipe.balbi@linux.intel.com>

Add new GTXTHRCFG bit field macros for DWC_usb31. The GTXTHRCFG register
fields for DWC_usb31 is as follows:
 +-------+--------------------------+-----------------------------------+
 | BITS  | Name                     | Description                       |
 +=======+==========================+===================================+
 | 31:27 | reserved                 |                                   |
 | 26    | UsbTxPktCntSel           | Async ESS transmit packet         |
 |       |                          | threshold enable                  |
 | 25:21 | UsbTxPktCnt              | Async ESS transmit packet         |
 |       |                          | threshold count                   |
 | 20:16 | UsbMaxTxBurstSize        | Async ESS Max transmit burst size |
 | 15    | UsbTxThrNumPktSel_HS_Prd | HS high bandwidth periodic        |
 |       |                          | transmit packet threshold enable  |
 | 14:13 | UsbTxThrNumPkt_HS_Prd    | HS high bandwidth periodic        |
 |       |                          | transmit packet threshold count   |
 | 12:11 | reserved                 |                                   |
 | 10    | UsbTxThrNumPktSel_Prd    | Periodic ESS transmit packet      |
 |       |                          | threshold enable                  |
 | 9:5   | UsbTxThrNumPkt_Prd       | Periodic ESS transmit packet      |
 |       |                          | threshold count                   |
 | 4:0   | UsbMaxTxBurstSize_Prd    | Max periodic ESS TX burst size    |
 +-------+--------------------------+-----------------------------------+
Signed-off-by: NThinh Nguyen <thinhn@synopsys.com>
Signed-off-by: NFelipe Balbi <felipe.balbi@linux.intel.com>

Add new GRXTHRCFG bit field macros for DWC_usb31. The GRXTHRCFG register
fields for DWC_usb31 is as follows:
 +-------+--------------------------+----------------------------------+
 | BITS  | Name                     | Description                      |
 +=======+==========================+==================================+
 | 31:27 | reserved                 |                                  |
 | 26    | UsbRxPktCntSel           | Async ESS receive packet         |
 |       |                          | threshold enable                 |
 | 25:21 | UsbRxPktCnt              | Async ESS receive packet         |
 |       |                          | threshold count                  |
 | 20:16 | UsbMaxRxBurstSize        | Async ESS Max receive burst size |
 | 15    | UsbRxThrNumPktSel_HS_Prd | HS high bandwidth periodic       |
 |       |                          | receive packet threshold enable  |
 | 14:13 | UsbRxThrNumPkt_HS_Prd    | HS high bandwidth periodic       |
 |       |                          | receive packet threshold count   |
 | 12:11 | reserved                 |                                  |
 | 10    | UsbRxThrNumPktSel_Prd    | Periodic ESS receive packet      |
 |       |                          | threshold enable                 |
 | 9:5   | UsbRxThrNumPkt_Prd       | Periodic ESS receive packet      |
 |       |                          | threshold count                  |
 | 4:0   | UsbMaxRxBurstSize_Prd    | Max periodic ESS RX burst size   |
 +-------+--------------------------+----------------------------------+
Signed-off-by: NThinh Nguyen <thinhn@synopsys.com>
Signed-off-by: NFelipe Balbi <felipe.balbi@linux.intel.com>

Update two GTXFIFOSIZ bit fields for the DWC_usb31 controller. TXFDEP
is a 15-bit value instead of 16-bit value, and bit 15 is TXFRAMNUM.

The GTXFIFOSIZ register for DWC_usb31 is as follows:
 +-------+-----------+----------------------------------+
 | BITS  | Name      | Description                      |
 +=======+===========+==================================+
 | 31:16 | TXFSTADDR | Transmit FIFOn RAM Start Address |
 | 15    | TXFRAMNUM | Asynchronous/Periodic TXFIFO     |
 | 14:0  | TXFDEP    | TXFIFO Depth                     |
 +-------+-----------+----------------------------------+
Signed-off-by: NThinh Nguyen <thinhn@synopsys.com>
Signed-off-by: NFelipe 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: NRoger Quadros <rogerq@ti.com>
Signed-off-by: NFelipe Balbi <felipe.balbi@linux.intel.com>

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

In order for ULPI PHYs to work, dwc3_phy_setup() and dwc3_ulpi_init()
must be doene before dwc3_core_get_phy().

commit 541768b0 ("usb: dwc3: core: Call dwc3_core_get_phy() before initializing phys")
broke this.

The other issue is that dwc3_core_get_phy() and dwc3_ulpi_init() should
be called only once during the life cycle of the driver. However,
as dwc3_core_init() is called during system suspend/resume it will
result in multiple calls to dwc3_core_get_phy() and dwc3_ulpi_init()
which is wrong.

Fix this by moving dwc3_ulpi_init() out of dwc3_phy_setup()
into dwc3_core_ulpi_init(). Use a flag 'ulpi_ready' to ensure that
dwc3_core_ulpi_init() is called only once from dwc3_core_init().

Use another flag 'phys_ready' to call dwc3_core_get_phy() only once from
dwc3_core_init().

Fixes: 541768b0 ("usb: dwc3: core: Call dwc3_core_get_phy() before initializing phys")
Fixes: f54edb53 ("usb: dwc3: core: initialize ULPI before trying to get the PHY")
Cc: linux-stable <stable@vger.kernel.org> # >= v4.13
Signed-off-by: NRoger Quadros <rogerq@ti.com>
Signed-off-by: NFelipe Balbi <felipe.balbi@linux.intel.com>

The FIFO/Queue type values are incorrect. Correct them according to
DWC_usb3 programming guide section 1.2.27 (or DWC_usb31 section 1.2.25).

Additionally, this patch includes ProtocolStatusQ and AuxEventQ types.

Fixes: cf6d867d ("usb: dwc3: core: add fifo space helper")
Signed-off-by: NThinh Nguyen <thinhn@synopsys.com>
Signed-off-by: NFelipe Balbi <felipe.balbi@linux.intel.com>

Some platforms (e.g. TI's DRA7 USB2 instance) have more trouble
with the metastability workaround as it supports only
a High-Speed PHY and the PHY can enter into an Erratic state [1]
when the controller is set in SuperSpeed mode as part of
the metastability workaround.

This causes upto 2 seconds delay in enumeration on DRA7's USB2
instance in gadget mode.

If these platforms can be better off without the workaround,
provide a device tree property to suggest that so the workaround
is avoided.

[1] Device mode enumeration trace showing PHY Erratic Error.
     irq/90-dwc3-969   [000] d...    52.323145: dwc3_event: event (00000901): Erratic Error [U0]
     irq/90-dwc3-969   [000] d...    52.560646: dwc3_event: event (00000901): Erratic Error [U0]
     irq/90-dwc3-969   [000] d...    52.798144: dwc3_event: event (00000901): Erratic Error [U0]
Signed-off-by: NRoger Quadros <rogerq@ti.com>
Signed-off-by: NFelipe Balbi <felipe.balbi@linux.intel.com>

Instead of keeping our own isoch_delay, let's make use of the newly
introduced isoch_delay member in struct usb_gadget. The benefit here
is that we would be using a generic "API" which other UDCs can use,
resulting in a common setup for gadget drivers who may be interested
in Isoch Delay value.
Signed-off-by: NFelipe Balbi <felipe.balbi@linux.intel.com>

Now that the SPDX tag is in all USB files, that identifies the license
in a specific and legally-defined manner.  So the extra GPL text wording
can be removed as it is no longer needed at all.

This is done on a quest to remove the 700+ different ways that files in
the kernel describe the GPL license text.  And there's unneeded stuff
like the address (sometimes incorrect) for the FSF which is never
needed.

No copyright headers or other non-license-description text was removed.

Cc: Kukjin Kim <kgene@kernel.org>
Cc: Krzysztof Kozlowski <krzk@kernel.org>
Cc: Patrice Chotard <patrice.chotard@st.com>
Acked-by: NFelipe Balbi <felipe.balbi@linux.intel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

It's good to have SPDX identifiers in all files to make it easier to
audit the kernel tree for correct licenses.

Update the drivers/usb/ and include/linux/usb* files with the correct
SPDX license identifier based on the license text in the file itself.
The SPDX identifier is a legally binding shorthand, which can be used
instead of the full boiler plate text.

This work is based on a script and data from Thomas Gleixner, Philippe
Ombredanne, and Kate Stewart.

Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Kate Stewart <kstewart@linuxfoundation.org>
Cc: Philippe Ombredanne <pombredanne@nexb.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: NFelipe Balbi <felipe.balbi@linux.intel.com>
Acked-by: NJohan Hovold <johan@kernel.org>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

This is in preparation to simplifying prototype of
__dwc3_gadget_kick_transfer().
Signed-off-by: NFelipe Balbi <felipe.balbi@linux.intel.com>

No functional changes, just making sure we can use these for ReST docs
later.
Signed-off-by: NFelipe Balbi <felipe.balbi@linux.intel.com>

This patch adds a quirk to disable USB 2.0 MAC linestate check
during HS transmit. Refer the dwc3 databook, we can use it for
some special platforms if the linestate not reflect the expected
line state(J) during transmission.

When use this quirk, the controller implements a fixed 40-bit
TxEndDelay after the packet is given on UTMI and ignores the
linestate during the transmit of a token (during token-to-token
and token-to-data IPGAP).

On some rockchip platforms (e.g. rk3399), it requires to disable
the u2mac linestate check to decrease the SSPLIT token to SETUP
token inter-packet delay from 566ns to 466ns, and fix the issue
that FS/LS devices not recognized if inserted through USB 3.0 HUB.
Acked-by: NRob Herring <robh@kernel.org>
Reviewed-by: NGuenter Roeck <groeck@chromium.org>
Signed-off-by: NWilliam Wu <william.wu@rock-chips.com>
Signed-off-by: NFelipe Balbi <felipe.balbi@linux.intel.com>

If dr_mode is "otg" then support dual role mode of operation.
Currently this mode is only supported when an extcon handle is
present in the dwc3 device tree node. This is needed to
get the ID status events of the port.

We're using a workqueue to manage the dual-role state transitions
as the extcon notifier (dwc3_drd_notifier) is called in an atomic
context by extcon_sync() and this doesn't go well with
usb_del_gadget_udc() causing a lockdep and softirq warning.
Signed-off-by: NRoger Quadros <rogerq@ti.com>
Signed-off-by: NFelipe Balbi <felipe.balbi@linux.intel.com>

We can't have both Host and Peripheral roles active at the same time
because of one detail on DWC3: it shares the same memory area for both
Host and Peripheral registers.

When swapping roles we must reinitialize the new role every
time. Let's make sure this works for our debugfs interface.
Signed-off-by: NRoger Quadros <rogerq@ti.com>
Signed-off-by: NFelipe Balbi <felipe.balbi@linux.intel.com>

We're going to use this member to track which role we're currently
playing, that way we can more easily implement dual-role swap in
upcoming patches.
Signed-off-by: NRoger Quadros <rogerq@ti.com>
Signed-off-by: NFelipe Balbi <felipe.balbi@linux.intel.com>

It's much simpler to just add one extra TRB chained to previous TRB to
handle ZLP. This helps us reduce pointless allocations and simplifies
the code a little bit.
Signed-off-by: NFelipe Balbi <felipe.balbi@linux.intel.com>

Just like we did for all other endpoint types, let's rely on a chained
TRB pointing to ep0_bounce_addr in order to align transfer size. This
will make the code simpler.
Signed-off-by: NFelipe Balbi <felipe.balbi@linux.intel.com>

If we pass TRB's own address on bpl/bph fields, we can get our SETUP
packet as immediate data on the TRB itself, without having to allocate
extra memory for it.
Signed-off-by: NFelipe Balbi <felipe.balbi@linux.intel.com>

To avoid checkpatch warnings with new patches let's
start using the BIT() macro wherever possible.
Signed-off-by: NRoger Quadros <rogerq@ti.com>
Signed-off-by: NFelipe Balbi <felipe.balbi@linux.intel.com>

- DWC_USB3_NUM indicates the number of Device mode single directional
  endpoints, including OUT and IN endpoint 0.

- DWC_USB3_NUM_IN_EPS indicates the maximum number of Device mode IN
  endpoints active at any time, including control endpoint 0.

It's possible to configure RTL such that DWC_USB3_NUM_EPS is equal to
DWC_USB3_NUM_IN_EPS.

dwc3-core calculates the number of OUT endpoints as DWC_USB3_NUM minus
DWC_USB3_NUM_IN_EPS. If RTL has been configured with DWC_USB3_NUM_IN_EPS
equal to DWC_USB3_NUM then dwc3-core will calculate the number of OUT
endpoints as zero.

For example a from dwc3_core_num_eps() shows:
[    1.565000]  /usb0@f01d0000: found 8 IN and 0 OUT endpoints

This patch refactors the endpoint calculation down to one variable
dwc->num_eps taking care to maintain the current mapping of endpoints for
fixed FPGA configurations as described in Table 4-7 of version 2.60a of the
DWC USB3 databook.

The endpoint mapping will then be EP-OUT, EP-IN etc, up to DWC_USB3_NUM.
If DWC_USB3_NUM is odd then OUT will take the extra endpoint.
Suggested-by: NFelipe Balbi <balbi@kernel.org>
Signed-off-by: NBryan O'Donoghue <pure.logic@nexus-software.ie>
Signed-off-by: NFelipe Balbi <felipe.balbi@linux.intel.com>

We must make sure that our macros are safe against expressions passed
as arguments. We have seen one problem where GTXFIFOSIZ(n) was failing
when passed the expression (epnum >> 1) as argument. The problem was
caused by operator precedence between >> and *.

To make sure macros are safe, we just wrap argument with () when using
it.
Signed-off-by: NRoger Quadros <rogerq@ti.com>
Signed-off-by: NFelipe Balbi <felipe.balbi@linux.intel.com>

This bit is only supposed to be used with known
buggy PHYs, however some platforms might erroneously
set it. In order to avoid it, let's make sure this
bit is always cleared. If some PHY needs this, we
will need to add a quirk flag.
Signed-off-by: NFelipe Balbi <felipe.balbi@linux.intel.com>

Instead of passing quirk_ep_out_aligned_size, we can use one extra TRB
to align transfer to wMaxPacketSize.
Signed-off-by: NFelipe Balbi <felipe.balbi@linux.intel.com>

Allocate a coherent buffer of 1024 bytes (size of a single superspeed
bulk packet) to serve as bounce buffer for an extra TRB needed to align
transfers to wMaxPacketSize.
Signed-off-by: NFelipe Balbi <felipe.balbi@linux.intel.com>