Commit Graph

76 Commits

Author SHA1 Message Date
Jessica Clarke
28da7c9ed0 Add syscon power and reset control device driver
This device driver supports both syscon-power and syscon-reset devices,
as specified in [1] and [2]. These provide a very simple interface for
power and reset control, and among other things are used by QEMU's virt
machine on RISC-V. A separate commit will enable this on RISC-V, as that
requires adding a RISC-V-specific riscv_syscon akin to r327936's
aw_syscon.

[1] https://www.kernel.org/doc/Documentation/devicetree/bindings/power/reset/syscon-poweroff.txt
[2] https://www.kernel.org/doc/Documentation/devicetree/bindings/power/reset/syscon-reboot.txt

Reviewed by:	brooks (mentor), jhb (mentor)
Approved by:	brooks (mentor), jhb (mentor)
Obtained from:	CheriBSD
Differential Revision:	https://reviews.freebsd.org/D25724
2020-07-26 18:19:50 +00:00
Michal Meloun
d873a521ca Revert r363123.
As Emanuel poited me the Linux processes these clock assignments in forward
order, not in reversed. I misread the original code.
Tha problem with wrong order for assigned clocks found in tegra (and some imx)
DT should be reanalyzed and solved by different way.

MFC with:	r363123
Reported by;	manu
2020-07-25 06:32:23 +00:00
Michal Meloun
c0c5cf7b31 Reverse the processing order of assigned clocks property.
Linux processes these clocks in reverse order and some DT relies
on this fact. For example, the frequency setting for a given PLL
is the last in the list, preceded by the frequency setting of its
following divider or so...

MFC after:	1 week
2020-07-12 07:59:15 +00:00
Michal Meloun
a9be5d7515 Assigned clocks: fix off-by-one bug, don't leak allocated memory.
MFC after:	1 week
2020-07-12 07:42:21 +00:00
Emmanuel Vadot
9d2c88ab2a extres/syscon_generic: Make device quiet if not in boot verbose
On some boards there is a lot of of syscon node that are unused as
more specific drivers is probed before, no need to flood the console
for the mostly-unused generic ones.

MFC after:	1 week
2020-07-08 17:14:44 +00:00
Pawel Biernacki
7029da5c36 Mark more nodes as CTLFLAG_MPSAFE or CTLFLAG_NEEDGIANT (17 of many)
r357614 added CTLFLAG_NEEDGIANT to make it easier to find nodes that are
still not MPSAFE (or already are but aren’t properly marked).
Use it in preparation for a general review of all nodes.

This is non-functional change that adds annotations to SYSCTL_NODE and
SYSCTL_PROC nodes using one of the soon-to-be-required flags.

Mark all obvious cases as MPSAFE.  All entries that haven't been marked
as MPSAFE before are by default marked as NEEDGIANT

Approved by:	kib (mentor, blanket)
Commented by:	kib, gallatin, melifaro
Differential Revision:	https://reviews.freebsd.org/D23718
2020-02-26 14:26:36 +00:00
Emmanuel Vadot
42d3cf0f82 regulator_fixed: Add a get_voltage method
Some consumer cannot know the voltage of the regulator without it.
While here, refuse to attach is min_voltage != max_voltage, it
shouldn't happens anyway.

Reviewed by:	mmel
MFC after:	1 month
Differential Revision:	https://reviews.freebsd.org/D23003
2020-01-16 20:52:26 +00:00
Kyle Evans
89476f9c99 regulator: small enhancements to regulator_shutdown
Highlights:

- Exit early if we're not disabling unused regulators; there's no need to
  take the regulator topology lock and re-evaluate this every iteration, as
  it's not going to change.
- Don't emit a notice that we're shutting down a regulator if it's not
  enabled, to reduce noise.
- Mention the outcome of the shutdown, to aide debugging and easily let
  developer/user collect list of regulators we actually shutdown to
  determine problematic one.

Reviewed by:	manu
MFC after:	3 days
Differential Revision:	https://reviews.freebsd.org/D22213
2020-01-12 04:07:03 +00:00
Emmanuel Vadot
650a41c6d0 regulator: fix regnode_method_get_voltage
This method is supposed to write the voltage into uvolt
and return an errno compatible value.

Reviewed by:	mmel
Differential Revision:	https://reviews.freebsd.org/D23006
2020-01-08 11:30:42 +00:00
Michal Meloun
124a91ac18 Implement support for (soft)linked clocks.
This kind of clock nodes represent temporary placeholder for clocks
defined later in boot process. Also, these are necessary to break
circular dependencies occasionally occurring in complex clock graphs.

MFC after: 3 weeks
2019-11-08 18:57:41 +00:00
Emmanuel Vadot
9c3a56d076 regulator: Add regulator_check_voltage function
This function will call the regnode_check_voltage method for a given regulator
and check if the desired voltage in reachable by it.
Also adds a default method that check the std_param and which should be enough
for most regulators and add it as the method for axp* rk805 and fixed regulators.

Reviewed by:	mmel
MFC after:	1 month
Differential Revision:	https://reviews.freebsd.org/D22260
2019-11-06 14:55:24 +00:00
Emmanuel Vadot
a601368040 regulator: Add a regnode_set_constraint function
This method check that boot_on or always_on is set to 1 and if it
is it will try to enable the regulator.
The binding docs aren't clear on what to do but Linux enable the regulator
if any of those properties is set so we want to do the same.
The function first check the status to see if the regulator is
already enabled it then get the voltage to check if it is in a acceptable
range and then enables it.
This will be either called from the regnode_init method (if it's needed by the platform)
or by a SYSINIT at SI_SUB_LAST

Reviewed by:	mmel
MFC after:	1 week
Differential Revision:	https://reviews.freebsd.org/D22106
2019-10-23 09:56:53 +00:00
Emmanuel Vadot
a24735546b regulator: Add a regnode_method_init
This is a default init method for regulator that don't really
need one.

MFC after:	1 week
2019-10-23 09:54:12 +00:00
Michal Meloun
7f8c4c78f5 Add method for getting of syscon handle from parent device.
If simple multifuction device also provides syscon interface, its
childern should be able to consume it. Due to this:
- declare coresponding method in syscon interface
- implement it in simple multifunction device driver

MFC after:	1 week
2019-08-18 08:08:56 +00:00
Emmanuel Vadot
8c8b86922a allwinner: Add a new clock aw_clk_m
We used the aw_clk_nm clock for clock with only one divider factor
and used a fake multiplier factor. This cannot work properly as we
end up writing the "fake" factor to the register (and so always set
the LSB to 1).
Create a new clock for those.
The reason for not using the clk_div clock is because those clocks are
a bit special. Since they are (almost) all related to video we also need
to set the parent clock (the main PLL) to a frequency that they can support.
As the main PLL have some minimal frequency that they can support we need to
be able to set the main PLL to a multiple of the desired frequency.
Let say you want to have a 71Mhz pixel clock (typical for a 1280x800 display)
and the main PLL cannot go under 192Mhz, you need to set it to 3 times the
desired frequency and set the divider to 3 on the hdmi clock.
So this also introduce the CLK_SET_ROUND_MULTIPLE flag that allow for this kind
of scenario.
2019-08-10 18:50:37 +00:00
Conrad Meyer
e2e050c8ef Extract eventfilter declarations to sys/_eventfilter.h
This allows replacing "sys/eventfilter.h" includes with "sys/_eventfilter.h"
in other header files (e.g., sys/{bus,conf,cpu}.h) and reduces header
pollution substantially.

EVENTHANDLER_DECLARE and EVENTHANDLER_LIST_DECLAREs were moved out of .c
files into appropriate headers (e.g., sys/proc.h, powernv/opal.h).

As a side effect of reduced header pollution, many .c files and headers no
longer contain needed definitions.  The remainder of the patch addresses
adding appropriate includes to fix those files.

LOCK_DEBUG and LOCK_FILE_LINE_ARG are moved to sys/_lock.h, as required by
sys/mutex.h since r326106 (but silently protected by header pollution prior
to this change).

No functional change (intended).  Of course, any out of tree modules that
relied on header pollution for sys/eventhandler.h, sys/lock.h, or
sys/mutex.h inclusion need to be fixed.  __FreeBSD_version has been bumped.
2019-05-20 00:38:23 +00:00
Michal Meloun
2dd13cf6a4 extres: Unify error codes for <foo>_get_by_ofw_property() methods.
Return:
 - ENOENT if requested property doesn't exist
 - ENODEV if producer device is not (yet) attached
 - ENXIO otherwise

MFC after:	2 weeks
2019-03-19 14:30:54 +00:00
Michal Meloun
1289ca623e Properly define and declare phynode_topo_lock,
it should be single global variable.

X-MFC with:	r340845
Noticed by:	phynode_topo_lock
2019-01-27 15:50:36 +00:00
Emmanuel Vadot
baec4d5985 extres: clk: Fix clk_set_assigned
ofw_bus_parse_xref_list_get_length doesn't returns the number of elements, fix this.
While here when setting the clock to the assigned freqeuncy, allow the clock
driver to round down or up the frequency as sometimes the exact frequency cannot
be obtain.
2018-11-29 19:06:05 +00:00
Emmanuel Vadot
3cb36739ce regulator_fixed: Do not disable fixed regulator at probe
If the regulator is unused it will be disabled by the regulator_shutdown sysinit.

Tested on pinebook where the backlight is controlled by a fixed-regulator.
The regulator doesn't have a regulator-boot-on param (I'm gonna upstream this) and so we disable it at probe.
We later enable it but this cause the screen to go black.
Linux doesn't disable regulator at boot (at least for fixed-regulator) so better match this to have the same UX.

MFC after:	1 month
Differential Revision:	https://reviews.freebsd.org/D17978
2018-11-26 18:46:15 +00:00
Emmanuel Vadot
f9f020a409 Derive PHY class to new one specialized for USB PHY functions.
Submitted by:	mmel
2018-11-23 19:43:18 +00:00
Emmanuel Vadot
79f29de22e regulator: Use bool values instead of 0/1
While here do not attempt to disable regulators if they are meant
to be always on.

Reviewed by:    mmel
Approved by:    re (kib)
2018-09-04 19:18:55 +00:00
Emmanuel Vadot
aed85e3011 extres: clkdiv: Fix div_with_table
We didn't allowed a divider register value of 0 which can exists and
also didn't wrote the value but the divider, which result of a wrong
frequency to be selected
2018-08-05 06:15:35 +00:00
Emmanuel Vadot
cfe196fbed nvmem: Add nvmem interface and helpers
The nvmem interface helps provider of nvmem data to expose themselves to consumer.
NVMEM is generally present on some embedded board in a form of eeprom or fuses.
The nvmem api are helpers for consumer to read/write the cell data from a provider.

Differential Revision:	https://reviews.freebsd.org/D16419
2018-07-31 19:08:24 +00:00
Michal Meloun
bcc0decdc9 Fix handling of enable counter for shared GPIO line in fixed regulator.
For most regulators, the regulator_stop() method can be transformed to
regulator disable. But, in some cases, we needs to maintain shared data
across multiple regulators (e.g. single GPIO pin which works as enable
for multiple regulates). In this case, the implementation of regulator
should perform his own enable counting therefore it is necessary to
distinguish between the regulator enable/disable method (which
increments/decrements enable counter for shared resource) and regulator
stop method (which don't affect it).

So:
- add regnode_stop() method to regulator framework and default it to
  regnode_enable(..., false, ...)
- implement it in regulator_fixed with proper enable counting.

While I'm in, also fix handling of always_on property. If any of regulators
sharing same GPIO pin have it enabled, then none of them can disable regulator.

Tested by: kevans
MFC after: 3 weeks
2018-06-16 08:25:38 +00:00
Kyle Evans
e937d05124 extres/regulator: Switch boot_on/always_on sysctl to uint8
These are represented as booleans on the kernel-side, but were being exposed
as int. This was causing some funky things to happen when read later with
sysctl(8), e.g. randomly reading super-high when the value was actually
'0'/false.

Reviewed by:	manu
2018-06-15 17:29:32 +00:00
Kyle Evans
e5f97ff2cc Revert r335173 at request of mmel@
This was the wrong solution to the problem; regulator_shutdown invokes
regnode_stop. regulator_stop is not a refcounting method, but it invokes
regnode_enable, which is.

mmel@ has a proposed patch/solution to instead provide regnode_fixed_stop
behavior that properly takes shared GPIO pins into account.
2018-06-15 13:14:45 +00:00
Kyle Evans
cba506f2c1 extres/regulator: Properly refcount gpio regulators
regnode::enable_cnt is generally used to refcount regulator nodes. For
GPIOs, the refcount was done on the gpio_entry since more than one regulator
can share a GPIO.

GPIO regulators were not taking part in the node refcount, since they had
their own mechanism. This caused some fallout after manu started disabling
everybody's unused regulators in r331989.

Refcount it.

Glanced over by:	manu
2018-06-14 20:37:25 +00:00
Emmanuel Vadot
0194dcd7a9 regulator: Fix typo (shuting/shutting)
Submitted by:	Jose Luis Duran (github pull #151)
2018-05-30 15:32:31 +00:00
Kyle Evans
4b3c64f722 Remove "All Rights Reserved" on files that I hold sole copyright on
See r333391 for more detail; in summary: it holds no weight and may be
removed.
2018-05-09 16:44:19 +00:00
Emmanuel Vadot
3914c76abb clk: clk_set_assigned: Skip frequency of value 0
A frequency of value 0 mean that we don't want to change the frequency so
skip it.
2018-05-07 09:42:35 +00:00
Emmanuel Vadot
d195d4acee clk: Add support for assigned-clock-rates
The properties 'assigned-clocks', 'assigned-clock-parents' and
'assigned-clock-rates' all work together.
'assigned-clocks' holds the list of clock for which we need to either
assign a new parent or a new frequency.
The old code just supported assigning a new parents, add support for
assigning a new frequency too.
2018-05-07 07:30:40 +00:00
Emmanuel Vadot
ee710ecf32 clk: Put the sysctls under hw.clock instead of clock
This is more consistant with hw.regulator and other hardware related
sysctls.
2018-04-27 00:12:00 +00:00
Emmanuel Vadot
bfeb2bd7ca regulator: Check status before disabling
When disabling regulator when they are unused, check before is they are
enabled.
While here don't check the enable_cnt on the regulator entry as it is
checked by regnode_stop.
This solve the panic on any board using a fixed regulator that is driven
by a gpio when the regulator is unused.

Tested On: OrangePi One
Pointy Hat to:	    myself
Reported by:	kevans, Milan Obuch (freebsd-arm@dino.sk)
2018-04-20 20:30:33 +00:00
Oleksandr Tymoshenko
f7604b1b27 Align OF_getencprop_alloc API with OF_getencprop and OF_getprop_alloc
Change OF_getencprop_alloc semantics to be combination of malloc and
OF_getencprop and return size of the property, not number of elements
allocated.

For the use cases where number of elements is preferred introduce
OF_getencprop_alloc_multi helper function that copies semantics
of OF_getencprop_alloc prior to this change.

This is to make OF_getencprop_alloc and OF_getencprop_alloc_multi
function signatures consistent with OF_getencprop_alloc and
OF_getencprop_alloc_multi.

Functionality-wise this patch is mostly rename of OF_getencprop_alloc
to OF_getencprop_alloc_multi except two calls in ofw_bus_setup_iinfo
where 1 was used as a block size.
2018-04-09 22:06:16 +00:00
Oleksandr Tymoshenko
217d17bcd3 Clean up OF_getprop_alloc API
OF_getprop_alloc takes element size argument and returns number of
elements in the property. There are valid use cases for such behavior
but mostly API consumers pass 1 as element size to get string
properties. What API users would expect from OF_getprop_alloc is to be
a combination of malloc + OF_getprop with the same semantic of return
value. This patch modifies API signature to match these expectations.

For the valid use cases with element size != 1 and to reduce
modification scope new OF_getprop_alloc_multi function has been
introduced that behaves the same way OF_getprop_alloc behaved prior to
this patch.

Reviewed by:	ian, manu
Differential Revision:	https://reviews.freebsd.org/D14850
2018-04-08 22:59:34 +00:00
Emmanuel Vadot
3f01401236 regulator: Disable unused regulator
bootloaders such as u-boot might enable regulators, or simply regulators could
be enabled by default by the PMIC, even if we don't have a driver for
the device or subsystem.
Disable unused regulators just before going to userland.
A tunable hw.regulator.disable_unused is added to not disable them in case
this causes problems on some board but the default behavior is to disable
everything unused.
I prefer to break thinks now and fix them rather than never switch to the
case were we disable regulators.

Tested on : Pine64-LTS (an idle board goes from ~0.33A to ~0.27A)
Tested on : BananaPi M2
Differential Revision:	https://reviews.freebsd.org/D14781
2018-04-04 06:44:24 +00:00
Emmanuel Vadot
82ce05526b extres/regulators: Add sysctls for regulators
For each regulators create an hw.regulator.<regname>. :
uvolt: Current value
always_on: 1 If the reg is always on
boot_on: 1 If the reg is set at boot time
enable_cnt: Number of consumer(s)
enable_delay: Delay before enabling the regulator
ramp_delay: The Ramp delay
max_uamp: The maximum value of the regulator in uAmps
min_uamp: The minimal value of the regulator in uAmps
max_uvolt: The maximum value of the regulator in uVolts
min_uvolt: The minimal value of the regulator in uVolts

Reviewed by:	ian
Differential Revision:	https://reviews.freebsd.org/D14578
2018-03-11 04:37:05 +00:00
Michal Meloun
4a744c0e9d Define meaning of remaining clock rounding flags combinations.
MFC after: 2 weeks
2018-02-27 16:08:08 +00:00
Michal Meloun
f1824e85ef Use more verbose panic messages.
MFC after: 2 weeks
2018-01-30 04:06:30 +00:00
Michal Meloun
962eb1c03f Revert r328511, it was committed with <patch>.diff instead of <patch>.txt as
commit log.
2018-01-30 04:05:03 +00:00
Michal Meloun
6403138990 diff --git a/sys/dev/extres/clk/clk.c b/sys/dev/extres/clk/clk.c
index c6a1f466ceb..c3708a0ce27 100644
--- a/sys/dev/extres/clk/clk.c
+++ b/sys/dev/extres/clk/clk.c
@@ -642,10 +642,11 @@ clknode_adjust_parent(struct clknode *clknode, int idx)
 	if (clknode->parent_cnt == 0)
 		return;
 	if ((idx == CLKNODE_IDX_NONE) || (idx >= clknode->parent_cnt))
-		panic("Invalid clock parent index\n");
+		panic("%s: Invalid parent index %d for clock %s",
+		    __func__, idx, clknode->name);

 	if (clknode->parents[idx] == NULL)
-		panic("%s: Attempt to set invalid parent %d for clock %s",
+		panic("%s: Invalid parent index %d for clock %s",
 		    __func__, idx, clknode->name);

 	/* Remove me from old children list. */
@@ -674,8 +675,8 @@ clknode_init_parent_idx(struct clknode *clknode, int idx)
 	if ((idx == CLKNODE_IDX_NONE) ||
 	    (idx >= clknode->parent_cnt) ||
 	    (clknode->parent_names[idx] == NULL))
-		panic("%s: Invalid clock parent index: %d\n", __func__, idx);
-
+		panic("%s: Invalid parent index %d for clock %s",
+		    __func__, idx, clknode->name);
 	clknode->parent_idx = idx;
 }
2018-01-28 15:20:45 +00:00
Michal Meloun
f8759facd2 Convert extres/phy to kobj model.
Similarly as other extres pseudo-drivers, implement phy by using kobj model.
This detaches it from provider device, so single device driver can export
multiple different phys. Additionally, this  allows phy to be subclassed to
more specialized drivers, like is USB OTG phy, or PCIe phy with hot-plug
capability.

Tested by:	manu (previous version, on Allwinner board)
MFC after:	1 month
2018-01-20 17:02:17 +00:00
Emmanuel Vadot
2b541904af clk: Get new parent freq after set_freq
During set_freq a clknode might have reparent (using a better parent that
have a higher frequency for example), before refreshing the cache, re-get
the parent frequency.

Reviewed by:	mmel
2018-01-20 14:47:27 +00:00
Kyle Evans
5996fd28fe Add SPDX tags to syscon bits, correct inconsistency in Copyright line. 2018-01-13 19:00:41 +00:00
Kyle Evans
a9f41deff6 Introduce aw_syscon(4) for earlier attachment
Attaching syscon_generic earlier than BUS_PASS_DEFAULT makes it more
difficult for specific syscon drivers to attach to the syscon node and to
get ordering right. Further discussion yielded the following set of
decisions:

- Move syscon_generic to BUS_PASS_DEFAULT
- If a platform needs a syscon with different attach order or probe
behavior, it should subclass syscon_generic and match on the SoC specific
compat string
- When we come across a need for a syscon that attaches earlier but only
specifies compatible = "syscon", we should create a syscon_exclusive driver
that provides generic access but probes earlier and only matches if "syscon"
is the only compatible. Such fdt nodes do exist in the wild right now, but
we don't really use them at the moment.

Additionally:

- Any syscon provider that has needs any more complex than a spinlock solely
for syscon access and a single memory resource should subclass syscon
directly rather than attempting to subclass syscon_generic or add complexity
to it. syscon_generic's attach/detach methods may be made public should the
need arise to subclass it with additional attach/detach behavior.

We introduce aw_syscon(4) that just subclasses syscon_generic but probes
earlier to meet our requirements for if_awg and implements #2 above for this
specific situation. It currently only matches a64/a83t/h3 since these are
the only platforms that really need it at the time being.

Discussed with:	ian
Reviewed by:	manu, andrew, bcr (manpages, content unchanged since review)
Differential Revision:	https://reviews.freebsd.org/D13793
2018-01-13 18:46:31 +00:00
Kyle Evans
ea9e0e28e0 Fix bogus pass for syscon_generic introduced in r327621
ian@ pointed out that BUS_PASS_DEFAULT + $anything is bogus, given that
BUS_PASS_DEFAULT is defined as __INT_MAX. Instead, we take a page out of
imx6_usbphy's book and use BUS_PASS_DEFAULT - 1000 to achieve the desired
effect of syscon_generic attaching before if_awg and other potential
consumers, but late enough that more specialized implementations should have
no problem attaching instead.

Reported by:	ian
2018-01-07 02:19:54 +00:00
Kyle Evans
e7cfe78afe Move syscon_generic to attach much later
It still needs to be before if_awg at least in order to be available for
other operations, but it should not be attaching before interrupt
controllers at the very least.

This should make errors involving syscon register space colliding with other
devices a little more innocent, but these conflicts should really be tracked
down and resolved. One such conflict is with the Raspberry Pi 3 local
interrupt controller, noticed by tuexen@

Reported by:	tuexen
2018-01-06 14:21:32 +00:00
Kyle Evans
198ca831a1 extres/syscon: Commit missing bits from r327106
r327106 introduced kobj to syscon so it can be subclassed and fit in with
the rest of the syscon framework. The diff for syscon.c was misapplied in a
clean tree prior to commit, so bring it back to what was included in the
review and tested. The entire file has basically been rewritten from what
was present prior to the kobj work.

Pointy hat to:	me
2017-12-26 16:38:04 +00:00
Alexander Kabaev
151ba7933a Do pass removing some write-only variables from the kernel.
This reduces noise when kernel is compiled by newer GCC versions,
such as one used by external toolchain ports.

Reviewed by: kib, andrew(sys/arm and sys/arm64), emaste(partial), erj(partial)
Reviewed by: jhb (sys/dev/pci/* sys/kern/vfs_aio.c and sys/kern/kern_synch.c)
Differential Revision: https://reviews.freebsd.org/D10385
2017-12-25 04:48:39 +00:00