Rename host-driver structure to gb_hd_driver to more clearly separate it
from the host-device structure.

Also remove an outdated description of the struct.
Signed-off-by: Johan Hovold <johan@hovoldconsulting.com>
Reviewed-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

Rename host-device structure gb_host_device to match our other
structures.
Signed-off-by: Johan Hovold <johan@hovoldconsulting.com>
Reviewed-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

Move everything host-device related to hd.c and hd.h.
Signed-off-by: Johan Hovold <johan@hovoldconsulting.com>
Reviewed-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

Remove obsolete comment about the driver model.
Signed-off-by: Johan Hovold <johan@hovoldconsulting.com>
Reviewed-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

Fix yet another ida memory leak due to failure to call the destructor.
Signed-off-by: Johan Hovold <johan@hovoldconsulting.com>
Reviewed-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

Connections are destroyed as part of interface tear down. If we fail to
do that properly it's a bug that should be fixed rather than papered
over by a fall-back clean up function.
Signed-off-by: Johan Hovold <johan@hovoldconsulting.com>
Reviewed-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

We can have connections without bundles so we must not use the bundle
device for error messages when failing to look up a protocol.
Signed-off-by: Johan Hovold <johan@hovoldconsulting.com>
Reviewed-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

We allow connections without bundles so we must not use the bundle
device for error messages after binding the protocol.
Signed-off-by: Johan Hovold <johan@hovoldconsulting.com>
Reviewed-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

Use parent of host device for error messages as the connections bundle
may be NULL.
Signed-off-by: Johan Hovold <johan@hovoldconsulting.com>
Reviewed-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

It is safe to use the bundle device for error messages when we know we
have a bundle.
Signed-off-by: Johan Hovold <johan@hovoldconsulting.com>
Reviewed-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

The connection device type is no longer used.
Signed-off-by: Johan Hovold <johan@hovoldconsulting.com>
Reviewed-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

Remove unused device_id field from host-device structure.
Signed-off-by: Johan Hovold <johan@hovoldconsulting.com>
Reviewed-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

Update obsolete bridge-device comments to better describe our current
ES2 endpoint layout.
Signed-off-by: Johan Hovold <johan@hovoldconsulting.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

Remove request handler for control protocol that makes no sense as we do
not have any incoming control requests defined.
Signed-off-by: Johan Hovold <johan@hovoldconsulting.com>
Reviewed-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

Remove unused time-stamp defines, that were left in when the time-stamp
fifo was removed.
Signed-off-by: Johan Hovold <johan@hovoldconsulting.com>
Reviewed-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

Compiling with clang shows that period_elapsed will be used as a branch
conditional unitialized whenever snd_dev->transfer_done <
runtime->period_size. Since stack can grow up/down as we proceed though
the call stack this should be fixed. This patch fixes by explicitly
initalizing period_elapsed to zero.
Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Reviewed-by: Alex Elder <elder@linaro.org>
Reviewed-by: Mark Greer <mgreer@animalcreek.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

We're one character out here in the placement of the inputs to pr_err().
Later patches show this up when pushing through checkpatch.pl. This patch
fixes by moving the offending variables one character left.
Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

Previously we had only one AP bridge connected to the AP.  We will
now have two.  Now that the have moved the logging related symbols
into the AP device, we can stop assuming there's only on of them.

Specifically, rename symbols like "apb1_*" to be just "apb_*",
because the "1" is no longer meaningful.
Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

Finish moving the logging data structures into the es2 AP data
structure rather than having it be a single global.  This patch
moves the two dentries related to logging.
Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

Continue moving the logging data structures into the es2 AP data
structure rather than having it be a single global.  This patch
moves the fifo.
Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

If an APB has a logging task it is associated with that APB.  Move
the task pointer into the es2_ap_dev structure rather than having it
be a single global.
Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

I tried this once before and Greg NAK'd it because at that point the
es2 code was nearly identical to the es1 code.  This is no longer
the case, and we need to diverge further, so I think it's time to go
down that path.

The ap_dev structure changed significantly for ES2 versus ES1 as of
this commit:
    667f8d3 es2.c: create dedicated struct for cport_in and cport_out
Since the structures are no longer the same, they should not have
the same name.

This patch renames three data structures so the "1" is replaced with
a "2", to reflect the Toshiba AP bridge chip revision we are working
with.  The structures are:
    es1_ap_dev -> es2_ap_dev
    es1_cport_in -> es2_cport_in
    es1_cport_out -> es2_cport_out

It changes names of symbols having this type as well.  To finish the
job, all references "ES1" (in comments and in symbol names) have
been switched to use "ES2" instead.

The result is a lot of changes, but they amount to a global search
and replace of "es1" with "es2" (and "ES1" with "ES2"), and the
result has been compile tested.
Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

We now have an officially assigned Google USB device id for the
APBridge, so add in support for it in the es2 driver.  The old entry can
be removed once the firmware has caught up and uses the new number.

We should use the version field to determine ES1/ES2/ES3, but that will
come later, for now, grab anything with this device id.
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

In apb_ctrl_get_devtree_data(), the value returned by
of_get_named_gpio() has a redundant test for a negative
return value.  GPIO numbers are non-negative, so this
test is redundant--testing gpio_is_valid() is sufficient.
Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

Used dev_err() by mistake, fix it.
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

Fix misspelled "mandatory," and use "GPIOs" for the plural form (no
apostrophe and capitalized) in comments.
Signed-off-by: Alex Elder <elder@linaro.org>
Reviewed-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

The code that fetches the reset GPIO for an AP bridge suffers
from an apparent copy/paste error.  Fix it.
Signed-off-by: Alex Elder <elder@linaro.org>
Reviewed-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

It belongs to the endo layer and should be placed in endo.c instead. Do
it.
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

The module will be released by gb_module_release() once all references
for the module are dropped. And so there is no need to free it in the
error path specially.
Reviewed-by: Johan Hovold <johan@hovoldconsulting.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

The interface will be released by gb_interface_release() once all
references for the interface are dropped. And so there is no need to
free it in the error path specially.
Reviewed-by: Johan Hovold <johan@hovoldconsulting.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

The bundle will be released by gb_bundle_release() once all references
for the bundle are dropped. And so there is no need to free it in the
error path specially.
Reviewed-by: Johan Hovold <johan@hovoldconsulting.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

During endo registration, a unique device id was allocated but then
never used. Instead the default dev_id 0 (due to kzalloc) was used for
device-generation and later for id-deallocation.
Signed-off-by: Johan Hovold <johan@hovoldconsulting.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

Fix use-after-free in endo-registration error path by moving the
id-release to the device release function.
Signed-off-by: Johan Hovold <johan@hovoldconsulting.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

With DB3, we now have AP as a master as far as AP bridges are concerned.
SVC will talk only to AP and AP will control bridges; unlike other
module interfaces.

So AP supposed to manage/control bridges in all power states including
power on reset.

During power on reset AP should follow below sequence -

Sequence (treated as a Cold Boot)

Stage-1
=======
AP:
 - Power On (Power up from PMIC to AP)
 - AP start booting
   Since power to AP bridges are controlled through gpio, power is gated
   to APB1 & 2
   No ref_clk to APB available (under SVC's control)
 - AP configures USB hub to enable HSIC interface to APB
 - As part of platform driver probe, AP follow below sequence
   - Set the pinctrl in default state
   - Hold APBs in reset by pulling down reset pin
   - Enable power to APB by enabling regulator and switches
   - De-assert (set 'low') 'boot_ret' signal
 - AP will assert (set 'high') the wake_detect signal, triggering
   connect/detect event to the SVC
 - AP waits for wake pulse from SVC

 SVC:
 - Power On (power up from PMIC to SVC)
 - SVC starts booting
 - SVC will de-assert reset signal to unipro switch
   - Switch starts booting
 - SVC confirms switch boot status using SPI (or something)
 - SVC waits for 300 msec (ES2 known issue)
 - SVC waits for detect/connect event from AP

Stage-2
=======
SVC:
 - ON connect/detect event, SVC send back wake pulse (cold boot)
   to AP over wake_detect pin, if SVC boot is completed.

AP:
 - On wake pulse from SVC (for cold boot), AP de-asserts (set high')
   reset signal to APB 1 and/or 2
 - Bridges starts booting
 - Eventually Unipro linkup occurs

Testing:

 - Build tested against Helium kernel
 - Due to unavailability of MSM and DB3 platform, only minimal testing
   has been done.
 - Code has been modified for validation on Helium + SDB platform.
    Mostly dts changes for gpio numbers
    And debug messages to check gpio values
 - On Helium + SDB platform, with addition of debug messages validated
   the sequence.

TODO list:

 - Currently _only_ supports power on sequence (cold boot).
   Both warm and cold boot support. Cold and Warm boot is
   differentiated based on pulse width of wake_detect signal
      >=5 msec = Cold boot else Warm boot
 - No support for Power management
   So the "power-down", "power-off", "wake_in" and "wake_out"
   signals are not explored/implemented.
 - Support for Work thread
    repetitive wake signal if no response from peer
    May required for PM support, as we have delays in the sequences
 - pinctrl states, specially to make sure we enable right pullup or pulldown
   when we set wake_detect pin to input
 - Convert gpio list into an array, and associated xxx-gpio-name property
Signed-off-by: Vaibhav Hiremath <vaibhav.hiremath@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

As the svc code is "odd" in how things are set up at initial connection
time, we can't always "know" that we have a valid bundle to use for
error messages.  So just punt and always use pr_*() calls to ensure that
we never incorrectly dereference a pointer.

This will get fixed up soon, but for now, let's just live with a bit
messier error messages in the log.
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Reviewed-by: Viresh Kumar <viresh.kumar@linaro.org>
Reviewed-by: Alex Elder <elder@linaro.org>
Reviewed-by: Johan Hovold <johan@hovoldconsulting.com>

As we are going to be removing the struct device from gb_connection,
there is no need to do anything for uevents for them.  So just remove
the code.  It wasn't doing anything anyway, so no functionality is lost
here at all.

As is_gb_connection() is no longer used, that is also removed in this
patch.
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Reviewed-by: Viresh Kumar <viresh.kumar@linaro.org>
Reviewed-by: Alex Elder <elder@linaro.org>
Reviewed-by: Johan Hovold <johan@hovoldconsulting.com>

The gb_bundle structure needs a private field if we are going to be able
to replace the gb_connection device with this one for all use cases.

Ideally we could use the private pointer within the struct device, but
for now let's just try to mirror how people were using the gb_connection
structure to make the patches simpler, and the logic the same.
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Reviewed-by: Viresh Kumar <viresh.kumar@linaro.org>
Reviewed-by: Alex Elder <elder@linaro.org>
Reviewed-by: Johan Hovold <johan@hovoldconsulting.com>

We are removing struct device from the gb_connection structure in the
near future.  The gb_bundle structure's struct device should be used as
a replacement.

This patch moves the protocol code to use the bundle pointer instead of
the connection pointer when printing out error messages.
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Reviewed-by: Viresh Kumar <viresh.kumar@linaro.org>
Reviewed-by: Alex Elder <elder@linaro.org>
Reviewed-by: Johan Hovold <johan@hovoldconsulting.com>

We are removing struct device from the gb_connection structure in the
near future.  The gb_bundle structure's struct device should be used as
a replacement.

This patch moves the greybus trace code to use the bundle pointer
instead of the connection pointer when printing out tracing messages.
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Reviewed-by: Viresh Kumar <viresh.kumar@linaro.org>
Reviewed-by: Alex Elder <elder@linaro.org>
Reviewed-by: Johan Hovold <johan@hovoldconsulting.com>

We are removing struct device from the gb_connection structure in the
near future.  The gb_bundle structure's struct device should be used as
a replacement.

This patch moves the loopback driver to use the bundle pointer instead
of the connection pointer.
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Reviewed-by: Viresh Kumar <viresh.kumar@linaro.org>
Reviewed-by: Alex Elder <elder@linaro.org>
Reviewed-by: Johan Hovold <johan@hovoldconsulting.com>