net: ipa: register IPA interrupt handlers directly

Declare the microcontroller IPA interrupt handler publicly, and
assign it directly in ipa_interrupt_config(). Make the SUSPEND IPA
interrupt handler public, and rename it ipa_power_suspend_handler().
Assign it directly in ipa_interrupt_config() as well.

This makes it unnecessary to do this in ipa_interrupt_add(). Make
similar changes for removing IPA interrupt handlers.

The next two patches will finish the cleanup, removing the
add/remove functions and the handler array entirely.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

net: ipa: update copyrights

Some source files state copyright dates that are earlier than the
last modification of the file. Change the copyright year to 2022 in
all such cases.

Signed-off-by: Alex Elder <elder@linaro.org>
Link: https://lore.kernel.org/r/20220930224549.3503434-1-elder@linaro.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

net: ipa: rename ipa_clock_* symbols

Rename a number of functions to clarify that there is no longer a
notion of an "IPA clock," but rather that the functions are more
generally related to IPA power management.

ipa_clock_enable() -> ipa_power_enable()
ipa_clock_disable() -> ipa_power_disable()
ipa_clock_rate() -> ipa_core_clock_rate()
ipa_clock_init() -> ipa_power_init()
ipa_clock_exit() -> ipa_power_exit()

Rename the ipa_clock structure to be ipa_power. Rename all
variables and fields using that structure type "power" rather
than "clock".

Rename the ipa_clock_data structure to be ipa_power_data, and more
broadly, just substitute "power" for "clock" in places that
previously represented things related to the "IPA clock".

Update comments throughout.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

net: ipa: introduce ipa_uc_clock()

The first time it's booted, the modem loads and starts the
IPA-resident microcontroller. Once the microcontroller has
completed its initialization, it notifies the AP it's "ready"
by sending an INIT_COMPLETED response message.

Until it receives that microcontroller message, the AP must ensure
the IPA core clock remains operational. Currently, a "proxy" clock
reference is taken in ipa_uc_config(), dropping it again once the
message is received.

However there could be a long delay between when ipa_config()
completes and when modem actually starts. And because the
microcontroller gets loaded by the modem, there's no need to
get the modem "proxy clock" until the first time it starts.

Create a new function ipa_uc_clock() which takes the "proxy" clock
reference for the microcontroller. Call it when we get remoteproc
SSR notification that the modem is about to start. Keep an
additional flag to record whether this proxy clock reference needs
to be dropped at shutdown time, and issue a warning if we get the
microcontroller message either before the clock reference is taken,
or after it has already been dropped.

Drop the nearby use of "hh" length modifiers, which are no longer
encouraged in the kernel.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

net: ipa: set up the microcontroller earlier

Initializing up the IPA-resident microcontroller requires the IPA
clock, and sets up two IPA interrupt handlers, but this does not
require GSI access. The interrupt handlers also require the clock
to be enabled, and require the IPA memory regions to be configured,
but neither requires GSI access. As a result, the microcontroller
can be initialized during the "config" rather than "setup" phase of
IPA initialization.

Initialize the microcontroller in ipa_config() rather than
ipa_setup(), and rename the called function ipa_uc_config().
Do the inverse in ipa_deconfig() rather than ipa_teardown(),
and rename the function for that case ipa_uc_deconfig().

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

soc: qcom: ipa: modem and microcontroller

This patch includes code implementing the modem functionality.
There are several communication paths between the AP and modem,
separate from the main data path provided by IPA. SMP2P provides
primitive messaging and interrupt capability, and QMI allows more
complex out-of-band messaging to occur between entities on the AP
and modem. (SMP2P and QMI support are added by the next patch.)
Management of these (plus the network device implementing the data
path) is done by code within "ipa_modem.c".

Sort of unrelated, this patch also includes the code supporting the
microcontroller CPU present on the IPA. The microcontroller can be
used to implement special handling of packets, but at this time we
don't support that. Still, it is a component that needs to be
initialized, and in the event of a crash we need to do some
synchronization between the AP and the microcontroller.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>