CVS log for src/sys/arch/macppc/dev/ki2c.c

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Keyword substitution: kv
Default branch: MAIN

Use old limit of 32 + 32 bytes to keep combining buffer on stack.
There are no devices on this platform that need more and for larger
values, the driver should be better rewritten.

Add a devhandle_subclass() helper function to simplify the common case
and use it.  Improve some comments.

Fix a memory leak if the "compatible" property is > 32 bytes.

Remove unnecessary references to i2c_attach_args::ia_prop and mark the ones
that remain as XXX.

Port over the changes from thorpej-i2c-spi-conf to thorpej-i2c-spi-conf2,
which is based on a newer HEAD revision.

Merge thorpej-cfargs2.

Adapt to CFARGS().

Move the bus/channel number for multi-channel / mux controllers out of
i2cbus_attach_args and stash it in the i2c_tag_t instead.  This makes it
accessible to platform device tree code when enumerating devices.

Adapt the Keywest i2c controller driver to the new i2c device enumeration
mechanism.  We need to provide our own enumeration callback because these
controllers do not use the standard OpenFirmware bindings.

The Keywest controller supports 2 physical i2c busses on a single controller,
so we logically split it up that way now, rather than encoding the channel in
in the i2c address as was done previously.

Different systems have different I2C device tree topologies.

Some systems use a scheme like this:

	/u3@0,f8000000/i2c@f8001000/temp-monitor@98
	/u3@0,f8000000/i2c@f8001000/fan@15e

Here, we see the channel encoded in bit #8 of the address.

Other systems use a scheme like this:

	/ht@0,f2000000/pci@4000,0,0/mac-io@7/i2c@18000/i2c-bus@0
	/ht@0,f2000000/pci@4000,0,0/mac-io@7/i2c@18000/i2c-bus@0/codec@8c

	/u4@0,f8000000/i2c@f8001000/i2c-bus@1
	/u4@0,f8000000/i2c@f8001000/i2c-bus@1/temp-monitor@94

Here, a separate device tree node represents the channel.
Note that in BOTH cases, the I2C address of the devices are
shifted left by 1 (as it would be on the wire to leave room
for the read/write bit).

Merge thorpej-cfargs branch:

Simplify and make extensible the config_search() / config_found() /
config_attach() interfaces: rather than having different variants for
which arguments you want pass along, just have a single call that
takes a variadic list of tag-value arguments.

Adjust all call sites:
- Simplify wherever possible; don't pass along arguments that aren't
  actually needed.
- Don't be explicit about what interface attribute is attaching if
  the device only has one.  (More simplification.)
- Add a config_probe() function to be used in indirect configuiration
  situations, making is visibly easier to see when indirect config is
  in play, and allowing for future change in semantics.  (As of now,
  this is just a wrapper around config_match(), but that is an
  implementation detail.)

Remove unnecessary or redundant interface attributes where they're not
needed.

There are currently 5 "cfargs" defined:
- CFARG_SUBMATCH (submatch function for direct config)
- CFARG_SEARCH (search function for indirect config)
- CFARG_IATTR (interface attribte)
- CFARG_LOCATORS (locators array)
- CFARG_DEVHANDLE (devhandle_t - wraps OFW, ACPI, etc. handles)

...and a sentinel value CFARG_EOL.

Add some extra sanity checking to ensure that interface attributes
aren't ambiguous.

Use CFARG_DEVHANDLE in MI FDT, OFW, and ACPI code, and macppc and shark
ports to associate those device handles with device_t instance.  This
will trickle trough to more places over time (need back-end for pre-OFW
Sun OBP; any others?).

Convert config_found_ia() call sites where the device only carries
a single interface attribute to bare config_found() calls.

more proplib API catchup

Mostly merge changes from HEAD upto 20200411

Sync with head.

defflag KI2C_DEBUG

if we have more than one i2c-bus node, look for children on both
now we find the light sensor in my shiny new toy

Cleanup i2c bus acquire / release, centralizing all of the logic into
iic_acquire_bus() / iic_release_bus().  "acquire" and "release" hooks
no longer need to be provided by back-end controller drivers (only if
they need special handling, e.g. powering on the i2c controller).
This results in the removal of a bunch of rendundant code from each
back-end controller driver.

Assert that we are not in hard interrupt context in iic_acquire_bus(),
iic_exec(), and iic_release_bus().

pass sensor location info to drivers if we can find it

Synch with HEAD

use channel info and set MODE bits accordingly instead of hoping OF set them
for us
now iic devices on different channels work properly

note to self: OF_getprop() returns -1 on error
now this works properly on sevan's iMac G4

update from HEAD

pass the right OF node to i2c devices

follow sparc64 and do direct config for i2c-devices
while there, make sure we play nice with smbus single byte reads

bus_space-ify

first step to clean up & bus-spacification:
- use i2c addresses with the direction bit shifted out in iic_exec and when
  attaching drivers so things attaching to iic* have a chance of working
- add an empty i2c-devices prop_array_t to keep drivers we don't want from
  attaching to iic*
- printf -> DPRINTF / aprint_*
- usa mapiodev() for now to make this work on G5

Sync with HEAD

zero the i2c_attach_args structure before filling it in.
fixes occasional crashes in iic_attach().

finish device_t-ification

Catchup with rmind-uvmplock merge.

struct device * -> device_t
struct cfdata * -> cfdata_t
use device accessors, use device_private.
some softc/device_t splits (macppc needs a bunch more)
aprint*_dev used considerably more

sync with head

Move counting of faults, traps, intrs, soft[intr]s, syscalls, and nswtch
from uvmexp to per-cpu cpu_data and move them to 64bits.  Remove unneeded
includes of <uvm/uvm_extern.h> and/or <uvm/uvm.h>.

Sync with HEAD.

Commit is split, to avoid a "too many arguments" protocol error.

sync with head.

Sync with HEAD.

ANSIfy another 1261 function definitions.
The only ones left in sys are beyond by sed script!
(or in sys/dist or sys/external)
Mostly they have function pointer parameters.

Change about 4500 of the K&R function definitions to ANSI ones.
There are still about 1600 left, but they have ',' or /* ... */
in the actual variable definitions - which my awk script doesn't handle.
There are also many that need () -> (void).
(The script does handle misordered arguments.)

Remove all the __P() from sys (excluding sys/dist)
Diff checked with grep and MK1 eyeball.
i386 and amd64 GENERIC and sys still build.

Sync with HEAD.

Avoid asking the controller to transfer zero bytes of data, since we have
no clue if this works or not.  This prevents the i2c quick_{read,write}
protocols from working, but the only place those protocols are used is in
the code that enumerates the i2c bus and that just doesn't make sense for
ki2c anyway.

While here, make sure that i2c send_{byte,word} operations will work even
if the caller provides the cmd (ie, register to modify) and the data in
separate args.  This is the normal calling sequence for iic_exec() routines
and will enable dbcool (4) driver to update device registers.

OK'd macallan@

sync with HEAD

Sync with HEAD.

Pullup to HEAD

Sync with HEAD.

Sync with head.

sync with head

lockmgr -> mutex

sync with HEAD

sync with head.

Sync with HEAD.

Follow the merge of pmap.c on i386 and amd64 and move
pmap_init_tmp_pgtbl into arch/x86/x86/pmap.c. Modify the ACPI wakeup
code to restore CR4 before jumping back into kernel space as the large
page option might cover that.

Sync with HEAD.

Sync with head.

sync with head.

Merge the ppcoea-renovation branch to HEAD.

This branch was a major cleanup and rototill of many of the various OEA
cpu based PPC ports that focused on sharing as much code as possible
between the various ports to eliminate near-identical copies of files in
every tree.  Additionally there is a new PIC system that unifies the
interface to interrupt code for all different OEA ppc arches.  The work
for this branch was done by a variety of people, too long to list here.

TODO:
bebox still needs work to complete the transition to -renovation.
ofppc still needs a bunch of work, which I will be looking at.
ev64260 still needs to be renovated
amigappc was not attempted.

NOTES:
pmppc was removed as an arch, and moved to a evbppc target.

Sync with head.

sync with head.

Sync with HEAD

Sync with HEAD.

struct cfattach -> CFATTACH_DECL; compiles again.

use CFATTACH_DECL()

sync with head.

sync with head

sync with head

Merge from HEAD.

Better explicitely specify the "ki2c" interface attribute,
so that the "config_found" can't hit "i2cbus".
Up to now, this relied on the fact that the i2cbus and ki2c
attach args both had a string as first element which was used
to distinguish. Now, interface attributes should take care
that attach arguments are not misinterpreted.

use the "i2cbus" interface attribute rather than putting a string name
into the i2cbus attach args

sync with head.

bare asm -> __asm

merge ktrace-lwp.

Sync with HEAD. Here we go again...

Check for 'i2c-bus' child and if found look for i2c devices there instead of
directly under the ki2c node.
Needed for newer ( 2005? ) OpenFirmware.

allow to attach a normal iic bus, implements only iic_exec() and locking functions so far.

In ki2c_write() Apply __UNCONST() to the data parameter passed to
ki2c_start(). The same back-end routine does reads and writes, so
there's no real type-safety to be had here.

Fix the sync with head I botched.

Sync with HEAD.

Sync with HEAD

file ki2c.c was added on branch ktrace-lwp on 2004-08-03 10:37:21 +0000

add support for the Keywest I2C and snapper audio device, as found on
some iBook and PowerBook models.

this driver was written by Tsubai Masanari and further hacked on by
Jared D. McNeill to work on his iBook.

the driver is limited (master volume control only, and I haven't
tested recording) but has been functioning perfectly on my PowerBook
g4 DVI (ivory) for some time.

ok'd by matt.