recover is a much better name than reset, considering
we don't really reset the IP, just run platform-specific
babble recovery algorithm.

while at that, also fix a typo in comment and add kdoc
for recover memeber of platform_ops.
Tested-by: NBin Liu <b-liu@ti.com>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

we're not resetting musb at all, just restarting
the session. This means we don't need to touch PHYs
or VBUS or anything like that. Just make sure session
bit is reenabled after MUSB dropped it.

while at that, make sure to tell usbcore that we're
dropping the session and, thus, disconnecting the
device.
Tested-by: NBin Liu <b-liu@ti.com>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

All we have to do is, really, drop session bit
and let the session restart.

Big thanks goes to Bin Liu <b-liu@ti.com> for
inspiring this work.
Tested-by: NBin Liu <b-liu@ti.com>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

When babble IRQ happens, we need to wait only
5.3us (320 cycles of 60MHz clock), we will give
it some slack and schedule our work a 10 usecs into
the future.
Tested-by: NBin Liu <b-liu@ti.com>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

We do *not* want to touch devctl at all when
trying to recover from babble. All we want to
do is mask IRQs until we're done without our
babble recovery, at which point we will unmask
IRQs.
Tested-by: NBin Liu <b-liu@ti.com>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

sometimes we want to just mask/unmask interrupts
without touching devctl register. For those
cases, let's introduce musb_enable_interrupts and
musb_disable_interrupts()
Tested-by: NBin Liu <b-liu@ti.com>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

this makes it easier to filter function traces.
No functional changes.
Tested-by: NBin Liu <b-liu@ti.com>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

Whenever babble happens, MUSB controller will
drop session automatically.

The only case where it won't drop the session,
is when we're running on AM335x and SW_SESSION_CTRL
bit has been set. In that case, controller will
not touch session bit so SW has a chance to recover
from babble condition.
Tested-by: NBin Liu <b-liu@ti.com>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

We want to check if that particular bit is
set. It could very well be that bootloader
(or romcode) has fiddled with MUSB before
us which could leave other bits set in this
register.
Tested-by: NBin Liu <b-liu@ti.com>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

musb->int_usb already contains the correct
information for musb-core to handle babble.

In fact, this very check was just causing a
nonsensical babble interrupt storm.

With this I can get test.sh to run and, even though
all tests fail with timeout, that's still better
than locking up the system due to IRQ storm.

Also, if I remove g_zero and load g_mass_storage,
then everything works fine again.
Tested-by: NBin Liu <b-liu@ti.com>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

MUSB does not generate a connect IRQ when working
in peripheral mode.
Tested-by: NBin Liu <b-liu@ti.com>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

when musb is operating as host and a remote wakeup
fires up, a resume interrupt will be raised. At that
point SUSPENDM bit is automatically cleared and
RESUME bit is automatically set.

Remove those two from IRQ handler.
Tested-by: NBin Liu <b-liu@ti.com>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

no functional changes, clean up only.
Tested-by: NBin Liu <b-liu@ti.com>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

There was already a proper place where we were
checking for babble interrupts, move babble
recovery there.
Tested-by: NBin Liu <b-liu@ti.com>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

if reset fails, we should return a *negative*
error code, not a positive value.
Tested-by: NBin Liu <b-liu@ti.com>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

FSDEV is set for both HIGH and FULL speeds,
the correct HIGHSPEED check is done through
power register's HSMODE bit.
Tested-by: NBin Liu <b-liu@ti.com>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

no functional changes, clean up only.
Tested-by: NBin Liu <b-liu@ti.com>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

devctl & MUSB_DEVCTL_HM represents a single bit,
just check for the bit, there's really no need
to compare the result against 0.
Tested-by: NBin Liu <b-liu@ti.com>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

instead of using manually spelled out bit-shits
and iterate over each of the 16-bits (one for
each endpoint) on each direction, we can make use
of for_each_set_bit() which internally uses
find_first_bit().

This makes the code slightly more readable while
also making we only iterate over bits which are
actually set.
Signed-off-by: NFelipe Balbi <balbi@ti.com>

As per Mentor Graphics' documentation, we should
always handle TX endpoints before RX endpoints.

This patch fixes that error while also updating
some hard-to-read comments which were scattered
around musb_interrupt().

This patch should be backported as far back as
possible since this error has been in the driver
since it's conception.

Cc: <stable@vger.kernel.org>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

that function is pretty close to a no-op by now,
all we need is a call to musb_stop().
Signed-off-by: NFelipe Balbi <balbi@ti.com>

We still have a combination of legacy phys and generic phys in
use so we need to support both types of phy for musb_dsps.c.

Cc: Brian Hutchinson <b.hutchman@gmail.com>
Signed-off-by: NTony Lindgren <tony@atomide.com>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

The value for the multipoint dts property is ignored when parsing with
of_property_read_bool, so we currently have multipoint always set as 1
even if value 0 is specified in the dts file.

Let's fix this to read the value too instead of just the property like
the binding documentation says as otherwise MUSB will fail to work
on devices with Mentor configuration that does not support multipoint.

Cc: Brian Hutchinson <b.hutchman@gmail.com>
Signed-off-by: NTony Lindgren <tony@atomide.com>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

We need a pm_runtime_get_sync() call from
within musb_gadget_pullup() to make sure
registers are accessible at that time.

The problem is that musb_gadget_pullup() is
called with IRQs disabled and, because of that,
we need to tell pm_runtime that this pm_runtime_get_sync()
is IRQ safe.

We can simply add pm_runtime_irq_safe(), however, because
we need to make our read/write accessor function pointers
have been initialized before trying to use them. This means
that all pm_runtime initialization for musb_core needs to
be moved down so that when we call pm_runtime_irq_safe(),
the pm_runtime_get_sync() that it calls on the parent, won't
cause a crash due to NULL musb_read/write accessors.
Reported-by: NPali Rohár <pali.rohar@gmail.com>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

Enable HCD_BH flag for musb host controller driver.
This improves the MSC/UVC through put. With this enabled
even 640x480@30fps webcam streaming is also supported.
Signed-off-by: NGeorge Cherian <george.cherian@ti.com>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

The commit 889ad3b "usb: musb: try a race-free wakeup" breaks device
hotplug enumeraitonn when the device is connected behind a hub while usb
autosuspend is enabled.

Adding finish_resume_work into runtime resume callback fixes the issue.

Also resume root hub is required to resume the bus from runtime suspend,
so move musb_host_resume_root_hub() back to its original location, where
handles RESUME interrupt.
Signed-off-by: NBin Liu <b-liu@ti.com>
Tested-by: NTony Lindgren <tony@atomide.com>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

bfin_remove() is not (nor should it be) marked as __exit, so we should
not be using __exit_p() wrapper with it, otherwise unbinding through
sysfs does not work properly.
Signed-off-by: NDmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

The omap musb front-end calls into the phy driver directly
instead of using a generic phy interface, which causes a link
error when the specific driver is not built-in:

drivers/built-in.o: In function `omap2430_musb_disable':
usb/musb/omap2430.c:480: undefined reference to `omap_control_usb_set_mode'
drivers/built-in.o: In function `omap2430_musb_enable':
usb/musb/omap2430.c:466: undefined reference to `omap_control_usb_set_mode'
usb/musb/omap2430.c:447: undefined reference to `omap_control_usb_set_mode'
drivers/built-in.o: In function `omap_musb_set_mailbox':
usb/musb/omap2430.c:273: undefined reference to `omap_control_usb_set_mode'
usb/musb/omap2430.c:304: undefined reference to `omap_control_usb_set_mode'
drivers/built-in.o:(.debug_addr+0xbd9e0): more undefined references to `omap_control_usb_set_mode' follow

This adds an explicit dependency.
Signed-off-by: NArnd Bergmann <arnd@arndb.de>
Fixes: ca784be3 ("usb: start using the control module driver")
Cc: <stable@vger.kernel.org> # v3.9+
Signed-off-by: NFelipe Balbi <balbi@ti.com>

Multiple musb glue drivers depend on the generic usb phy support,
but fail to list it as a dependency in Kconfig. This results
in build erros like:

drivers/built-in.o: In function `am35x_remove':
:(.text+0xadacc): undefined reference to `usb_phy_generic_unregister'
drivers/built-in.o: In function `am35x_probe':
:(.text+0xae1c8): undefined reference to `usb_phy_generic_register'
:(.text+0xae244): undefined reference to `usb_phy_generic_unregister'
drivers/built-in.o: In function `jz4740_remove':
:(.text+0xaf648): undefined reference to `usb_phy_generic_unregister'
drivers/built-in.o: In function `jz4740_musb_init':
:(.text+0xaf694): undefined reference to `usb_phy_generic_register'

This adds the ones that are missing.
Signed-off-by: NArnd Bergmann <arnd@arndb.de>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

Delete private selfpowered variable, and use common one.
Signed-off-by: NPeter Chen <peter.chen@freescale.com>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

1. set AUTOREQ to NONE at the beginning of teardown;

2. add delay for dma pipeline to drain;

3. Do not set USB_TDOWN bit for RX teardown.

  The CPPI hw has an issue that when tearing down a RX channel, if
  another RX channel is receiving data, the CPPI will lockup.

  To workaround the issue, do not set the CPPI TD bit. The steps before
  this point ensures the CPPI channel will be torn down properly.
Signed-off-by: NBin Liu <b-liu@ti.com>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

The macro EP_MODE_AUTOREG_* should be called EP_MODE_AUTOREQ_*, as they
are used for register AUTOREQ.
Signed-off-by: NBin Liu <b-liu@ti.com>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

Fix  using the  bare numbers to set the 'wHubCharacteristics' field of the Hub
Descriptor while the values are #define'd in <linux/usb/ch11.h>.
Signed-off-by: NSergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

Fix  using the  bare numbers to set the 'wHubCharacteristics' field of the Hub
Descriptor while the values are #define'd in <linux/usb/ch11.h>.
Signed-off-by: NSergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

While the code is correct and functions well, it's still
a bit misleading to add the reference operator in from of
the buf argument.

This patch simply removes that operator in order to make
use of buf slightly better to the eyes.
Signed-off-by: NMarkus Pargmann <mpa@pengutronix.de>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

since the split of host+gadget mode in commit 74c2e936 ("usb: musb:
factor out hcd initalization") we leak the usb_hcd struct. We call now
musb_host_cleanup() which does basically usb_remove_hcd() and also sets
the hcd variable to NULL. Doing so makes the finall call to
musb_host_free() basically a nop and the usb_hcd remains around for ever
without anowner.
This patch drops that NULL assignment for that reason.

Fixes: 74c2e936 ("usb: musb: factor out hcd initalization")
Cc: <stable@vger.kernel.org> # v3.11+
Cc: Daniel Mack <zonque@gmail.com>
Signed-off-by: NSebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

Commit 82c02f58 ("usb: musb: Allow multiple glue layers to be
built in") enabled selecting multiple glue layers, which in turn
exposed things more for randconfig builds. If NOP_USB_XCEIV is
built-in and TUSB6010 is a loadable module, we will get:

drivers/built-in.o: In function `tusb_remove':
tusb6010.c:(.text+0x16a817): undefined reference to `usb_phy_generic_unregister'
drivers/built-in.o: In function `tusb_probe':
tusb6010.c:(.text+0x16b24e): undefined reference to `usb_phy_generic_register'
make: *** [vmlinux] Error 1

Let's fix this the same way as commit 70c1ff4b ("usb: musb:
tusb-dma can't be built-in if tusb is not").

And while at it, let's not allow selecting the glue layers except
on platforms really using them unless COMPILE_TEST is specified:

- TUSB6010 is in practise only used on omaps

- DSPS is only used on TI platforms

- UX500 is only used on STE platforms

Cc: Linus Walleij <linus.walleij@linaro.org>
Reported-by: NJim Davis <jim.epost@gmail.com>
Signed-off-by: NTony Lindgren <tony@atomide.com>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

!strncmp(buf, "force host", 9) is true if and only if buf starts with
"force hos". This was obviously not what was intended. The same error
exists for "force full-speed", "force high-speed" and "test
packet". Using strstarts avoids the error-prone hardcoding of the
prefix length.

For consistency, also change the other occurences of the !strncmp
idiom.
Signed-off-by: NRasmus Villemoes <linux@rasmusvillemoes.dk>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

commit cc92f681 (usb: musb: Populate new IO
functions for blackfin) added a typo which
prevented MUSB's blackfin glue layer from being
built. Due to lack of tests and compilers for
that architecture, the typo ended up being
merged and causing a build regression.

Fix that here

Cc: Tony Lindgren <tony@atomide.com>
Reported-by: NFengguang Wu <fengguang.wu@intel.com>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

Blackfin's MUSB implementation lacks a bunch of
registers which they end up not defining a macro
for. In order to avoid build breaks, let's ifdef
out some of the registers from our regdump debugfs
utility so that we don't try to use those on
Blackfin builds.
Reported-by: NFengguang Wu <fengguang.wu@intel.com>
Signed-off-by: NFelipe Balbi <balbi@ti.com>