net: ipa: generalize register field functions

Rename functions related to register fields so they don't appear to
be IPA-specific, and move their definitions into "reg.h":
ipa_reg_fmask() -> reg

net: ipa: generalize register field functions

Rename functions related to register fields so they don't appear to
be IPA-specific, and move their definitions into "reg.h":
ipa_reg_fmask() -> reg_fmask()
ipa_reg_bit() -> reg_bit()
ipa_reg_field_max() -> reg_field_max()
ipa_reg_encode() -> reg_encode()
ipa_reg_decode() -> reg_decode()

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

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net: ipa: generalize register offset functions

Rename ipa_reg_offset() to be reg_offset() and move its definition
to "reg.h". Rename ipa_reg_n_offset() to be reg_n_offset() also.

Signed-off-by: Al

net: ipa: generalize register offset functions

Rename ipa_reg_offset() to be reg_offset() and move its definition
to "reg.h". Rename ipa_reg_n_offset() to be reg_n_offset() also.

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

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net: ipa: start generalizing "ipa_reg"

IPA register definitions have evolved with each new version. The
changes required to support more than 32 endpoints in IPA v5.0 made
it best to define a unifi

net: ipa: start generalizing "ipa_reg"

IPA register definitions have evolved with each new version. The
changes required to support more than 32 endpoints in IPA v5.0 made
it best to define a unified mechanism for defining registers and
their fields.

GSI register definitions, meanwhile, have remained fairly stable.
And even as the total number of IPA endpoints goes beyond 32, the
number of GSI channels on a given EE that underly endpoints still
remains 32 or less.

Despite that, GSI v3.0 (which is used with IPA v5.0) extends the
number of channels (and events) it supports to be about 256, and as
a result, many GSI register definitions must change significantly.
To address this, we'll use the same "ipa_reg" mechanism to define
the GSI registers.

As a first step in generalizing the "ipa_reg" to also support GSI
registers, isolate the definitions of the "ipa_reg" and "ipa_regs"
structure types (and some supporting macros) into a new header file,
and remove the "ipa_" and "IPA_" from symbol names.

Separate the IPA register ID validity checking from the generic
check that a register ID is in range. Aside from that, this is
intended to have no functional effect on the code.

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

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net: ipa: kill ipa_interrupt_add()

The dynamic assignment of IPA interrupt handlers isn't needed; we
only handle three IPA interrupt types, and their handler functions
are now assigned directly. We

net: ipa: kill ipa_interrupt_add()

The dynamic assignment of IPA interrupt handlers isn't needed; we
only handle three IPA interrupt types, and their handler functions
are now assigned directly. We can get rid of ipa_interrupt_add()
and ipa_interrupt_remove() now, because they serve no purpose.

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

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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 handl

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>

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net: ipa: enable IPA interrupt handlers separate from registration

Expose ipa_interrupt_enable() and have functions that register
IPA interrupt handlers enable them directly, rather than having the

net: ipa: enable IPA interrupt handlers separate from registration

Expose ipa_interrupt_enable() and have functions that register
IPA interrupt handlers enable them directly, rather than having the
registration process do that. Do the same for disabling IPA
interrupt handlers.

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

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net: ipa: introduce a common microcontroller interrupt handler

The prototype for an IPA interrupt handler supplies the IPA
interrupt ID, so it's possible to use a single function to handle
any type

net: ipa: introduce a common microcontroller interrupt handler

The prototype for an IPA interrupt handler supplies the IPA
interrupt ID, so it's possible to use a single function to handle
any type of microcontroller interrupt.

Introduce ipa_uc_interrupt_handler(), which calls the event or the
response handler depending on the IRQ ID provided. Register the new
function as the handler for both microcontroller IPA interrupt types.

The called functions don't use their "irq_id" arguments, so remove
them.

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

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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: Ale

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>

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net: ipa: define remaining IPA register fields

Define the fields for the ENDP_INIT_DEAGGR, ENDP_INIT_RSRC_GRP,
ENDP_INIT_SEQ, ENDP_STATUS, and ENDP_FILTER_ROUTER_HSH_CFG, and
IPA_IRQ_UC IPA register

net: ipa: define remaining IPA register fields

Define the fields for the ENDP_INIT_DEAGGR, ENDP_INIT_RSRC_GRP,
ENDP_INIT_SEQ, ENDP_STATUS, and ENDP_FILTER_ROUTER_HSH_CFG, and
IPA_IRQ_UC IPA registers for all supported IPA versions.

Create enumerated types to identify fields for these IPA registers.
Use IPA_REG_FIELDS() and IPA_REG_STRIDE_FIELDS() to specify the
field mask values defined for these registers, for each supported
version of IPA.

Use ipa_reg_encode() and ipa_reg_bit() to build up the values to be
written to these registers, remove an inline function and all the
*_FMASK symbols that are now no longer used.

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

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net: ipa: introduce ipa_reg()

Create a new function that returns a register descriptor given its
ID. Change ipa_reg_offset() and ipa_reg_n_offset() so they take a
register descriptor argument rathe

net: ipa: introduce ipa_reg()

Create a new function that returns a register descriptor given its
ID. Change ipa_reg_offset() and ipa_reg_n_offset() so they take a
register descriptor argument rather than an IPA pointer and register
ID. Have them accept null pointers (and return an invalid 0 offset),
to avoid the need for excessive error checking. (A warning is issued
whenever ipa_reg() returns 0).

Call ipa_reg() or ipa_reg_n() to look up information about the
register before calls to ipa_reg_offset() and ipa_reg_n_offset().
Delay looking up offsets until they're needed to read or write
registers.

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

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net: ipa: use IPA register IDs to determine offsets

Expose two inline functions that return the offset for a register
whose ID is provided; one of them takes an additional argument
that's used for r

net: ipa: use IPA register IDs to determine offsets

Expose two inline functions that return the offset for a register
whose ID is provided; one of them takes an additional argument
that's used for registers that are parameterized. These both use
a common helper function __ipa_reg_offset(), which just uses the
offset symbols already defined.

Replace all references to the offset macros defined for IPA
registers with calls to ipa_reg_offset() or ipa_reg_n_offset().

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

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net: ipa: request IPA register values be retained

In some cases, the IPA hardware needs to request the always-on
subsystem (AOSS) to coordinate with the IPA microcontroller to
retain IPA register va

net: ipa: request IPA register values be retained

In some cases, the IPA hardware needs to request the always-on
subsystem (AOSS) to coordinate with the IPA microcontroller to
retain IPA register values at power collapse. This is done by
issuing a QMP request to the AOSS microcontroller. A similar
request ondoes that request.

We must get and hold the "QMP" handle early, because we might get
back EPROBE_DEFER for that. But the actual request should be sent
while we know the IPA clock is active, and when we know the
microcontroller is operational.

Fixes: 1aac309d3207 ("net: ipa: use autosuspend")
Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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net: ipa: request IPA register values be retained

commit 34a081761e4e3c35381cbfad609ebae2962fe2f8 upstream.

In some cases, the IPA hardware needs to request the always-on
subsystem (AOSS) to coordi

net: ipa: request IPA register values be retained

commit 34a081761e4e3c35381cbfad609ebae2962fe2f8 upstream.

In some cases, the IPA hardware needs to request the always-on
subsystem (AOSS) to coordinate with the IPA microcontroller to
retain IPA register values at power collapse. This is done by
issuing a QMP request to the AOSS microcontroller. A similar
request ondoes that request.

We must get and hold the "QMP" handle early, because we might get
back EPROBE_DEFER for that. But the actual request should be sent
while we know the IPA clock is active, and when we know the
microcontroller is operational.

Fixes: 1aac309d3207 ("net: ipa: use autosuspend")
Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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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

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>

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net: ipa: use autosuspend

Use runtime power management autosuspend.

Up until this point, we only suspended the IPA hardware for system
suspend; now we'll suspend it aggressively using runtime power

net: ipa: use autosuspend

Use runtime power management autosuspend.

Up until this point, we only suspended the IPA hardware for system
suspend; now we'll suspend it aggressively using runtime power
management, setting the initial autosuspend delay to half a second
of inactivity.

Replace pm_runtime_put() calls with pm_runtime_put_autosuspend(),
call pm_runtime_mark_last_busy() before each of those. In places
where we're shutting things down, or decrementing power references
for errors, use pm_runtime_put_noidle() instead.

Finally, remove ipa_runtime_idle(), so the ->runtime_suspend
callback will occur if idle.

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

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net: ipa: don't use ipa_clock_get() in "ipa_uc.c"

Replace the ipa_clock_get() call in ipa_uc_clock() when taking the
"proxy" clock reference for the microcontroller with a call to
pm_runtime_get_syn

net: ipa: don't use ipa_clock_get() in "ipa_uc.c"

Replace the ipa_clock_get() call in ipa_uc_clock() when taking the
"proxy" clock reference for the microcontroller with a call to
pm_runtime_get_sync(). Replace calls of ipa_clock_put() for the
microcontroller with pm_runtime_put() calls instead.

There is a chance we get an error when taking the microcontroller
power reference. This is an unlikely scenario, where system suspend
is initiated just before we learn the modem is booting. For now
we'll just accept that this could occur, and report it if it does.

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

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net: ipa: have ipa_clock_get() return a value

We currently assume no errors occur when enabling or disabling the
IPA core clock and interconnects. And although this commit exposes
errors that could

net: ipa: have ipa_clock_get() return a value

We currently assume no errors occur when enabling or disabling the
IPA core clock and interconnects. And although this commit exposes
errors that could occur, we generally assume this won't happen in
practice.

This commit changes ipa_clock_get() and ipa_clock_put() so each
returns a value. The values returned are meant to mimic what the
runtime power management functions return, so we can set up error
handling here before we make the switch. Have ipa_clock_get()
increment the reference count even if it returns an error, to match
the behavior of pm_runtime_get().

More details follow.

When taking a reference in ipa_clock_get(), return 0 for the first
reference, 1 for subsequent references, or a negative error code if
an error occurs. Note that if ipa_clock_get() returns an error, we
must not touch hardware; in some cases such errors now cause entire
blocks of code to be skipped.

When dropping a reference in ipa_clock_put(), we return 0 or an
error code. The error would come from ipa_clock_disable(), which
now returns what ipa_interconnect_disable() returns (either 0 or a
negative error code). For now, callers ignore the return value;
if an error occurs, a message will have already been logged, and
little more can actually be done to improve the situation.

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

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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 th

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>

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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. T

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>

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net: ipa: introduce ipa_mem_find()

Introduce a new function that abstracts finding information about a
region in IPA-local memory, given its memory region ID. For now it
simply uses the region ID a

net: ipa: introduce ipa_mem_find()

Introduce a new function that abstracts finding information about a
region in IPA-local memory, given its memory region ID. For now it
simply uses the region ID as an index into the IPA memory array.
If the region is not defined, ipa_mem_find() returns a null pointer.

Update all code that accesses the ipa->mem[] array directly to use
ipa_mem_find() instead. The return value must be checked for null
when optional memory regions are sought.

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

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net: ipa: support IPA interrupt addresses for IPA v4.7

Starting with IPA v4.7, registers related to IPA interrupts are
located at a fixed offset 0x1000 above than the addresses used for
earlier vers

net: ipa: support IPA interrupt addresses for IPA v4.7

Starting with IPA v4.7, registers related to IPA interrupts are
located at a fixed offset 0x1000 above than the addresses used for
earlier versions. Define and use functions to provide the offset to
use for these registers based on IPA version.

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

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net: ipa: a few last IPA register cleanups

Some last cleanups for the existing IPA register definitions:
- Remove the definition of IPA_REG_ENABLED_PIPES_OFFSET, because
it is not used.
- Us

net: ipa: a few last IPA register cleanups

Some last cleanups for the existing IPA register definitions:
- Remove the definition of IPA_REG_ENABLED_PIPES_OFFSET, because
it is not used.
- Use "IPA_" instead of "BAM_" as the prefix on fields associated
with the FLAVOR_0 register. We use GSI (not BAM), but the
fields apply to both GSI and BAM.
- Get rid of the definition of IPA_CS_RSVD; it is never used.
- Add two missing field mask definitions for the INIT_DEAGGR
endpoint register.
- Eliminate a few of the defined sequencer types, because they
are unused. We can add them back when needed.
- Add a field mask to indicate which bit causes an interrupt on
the microcontroller.

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

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net: ipa: define enumerated types consistently

Consistently define numeric values for enumerated type members using
hexidecimal (rather than decimal) format values. Align the values
assigned in the

net: ipa: define enumerated types consistently

Consistently define numeric values for enumerated type members using
hexidecimal (rather than decimal) format values. Align the values
assigned in the same column in each file.

Only assign values where they really matter, for example don't
assign IPA_ENDPOINT_AP_MODEM_TX the value 0.

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

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net: ipa: ignore the microcontroller log event

The IPA-resident microcontroller has the ability to log various
activity in an area of IPA shared memory. When the microcontroller
starts it generates

net: ipa: ignore the microcontroller log event

The IPA-resident microcontroller has the ability to log various
activity in an area of IPA shared memory. When the microcontroller
starts it generates an event to the AP to provide information about
the log.

We don't support reading this log, and we can safely ignore the
event. So do that rather than treating the log info event we
receive as "unsupported."

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

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net: ipa: fix two comments

In ipa_uc_response_hdlr() a comment uses the wrong function name
when it describes where a clock reference is taken. Fix this.

Also fix the comment in ipa_uc_response_hd

net: ipa: fix two comments

In ipa_uc_response_hdlr() a comment uses the wrong function name
when it describes where a clock reference is taken. Fix this.

Also fix the comment in ipa_uc_response_hdlr() to correctly refer to
ipa_uc_setup(), which is where the clock reference described here is
taken.

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

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