This patch updates license to use SPDX-License-Identifier
instead of verbose license text.
As original license mentioned, it is GPL-2.0 in SPDX.
Then, MODULE_LICENSE() should be "GPL v2" instead of "GPL".
See ${LINUX}/include/linux/module.h
"GPL" [GNU Public License v2 or later]
"GPL v2" [GNU Public License v2]
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Trivial fix to clean up indentation issues, remove spaces, add missing
tabs
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Clang warns when one enumerated type is implicitly converted to another:
drivers/rtc/rtc-omap.c:574:21: warning: implicit conversion from
enumeration type 'enum rtc_pin_config_param' to different enumeration
type 'enum pin_config_param' [-Wenum-conversion]
{"ti,active-high", PIN_CONFIG_ACTIVE_HIGH, 0},
~ ^~~~~~~~~~~~~~~~~~~~~~
drivers/rtc/rtc-omap.c:579:12: warning: implicit conversion from
enumeration type 'enum rtc_pin_config_param' to different enumeration
type 'enum pin_config_param' [-Wenum-conversion]
PCONFDUMP(PIN_CONFIG_ACTIVE_HIGH, "input active high", NULL, false),
~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
./include/linux/pinctrl/pinconf-generic.h:163:11: note: expanded from
macro 'PCONFDUMP'
.param = a, .display = b, .format = c, .has_arg = d \
^
2 warnings generated.
It is expected that pinctrl drivers can extend pin_config_param because
of the gap between PIN_CONFIG_END and PIN_CONFIG_MAX so this conversion
isn't an issue. Most drivers that take advantage of this define the
PIN_CONFIG variables as constants, rather than enumerated values. Do the
same thing here so that Clang no longer warns.
Link: https://github.com/ClangBuiltLinux/linux/issues/144
Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Fix an issue with the 32-bit range error path in `rtc_hctosys' where no
error code is set and consequently the successful preceding call result
from `rtc_read_time' is propagated to `rtc_hctosys_ret'. This in turn
makes any subsequent call to `hctosys_show' incorrectly report in sysfs
that the system time has been set from this RTC while it has not.
Set the error to ERANGE then if we can't express the result due to an
overflow.
Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org>
Fixes: b3a5ac42ab ("rtc: hctosys: Ensure system time doesn't overflow time_t")
Cc: stable@vger.kernel.org # 4.17+
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
When there is no IRQ configured for the RTC, the rtc-cmos code does not
support alarms, all alarm rtc_ops fail with -EIO / -EINVAL.
The rtc-core expects a rtc driver which does not support rtc alarms to
not have alarm ops at all. Otherwise the wakealarm sysfs attr will read
as empty rather then returning an error, making it impossible for
userspace to find out beforehand if alarms are supported.
A system without an IRQ for the RTC before this patch:
[root@localhost ~]# cat /sys/class/rtc/rtc0/wakealarm
[root@localhost ~]#
After this patch:
[root@localhost ~]# cat /sys/class/rtc/rtc0/wakealarm
cat: /sys/class/rtc/rtc0/wakealarm: No such file or directory
[root@localhost ~]#
This fixes gnome-session + systemd trying to use suspend-then-hibernate,
which causes systemd to abort the suspend when writing the RTC alarm fails.
BugLink: https://github.com/systemd/systemd/issues/9988
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
When registering one RTC device, it will check to see if there is an
alarm already set in RTC hardware by reading RTC alarm, at this time
we should always read the normal alarm put in always-on region by
checking the rtc->registered flag.
Signed-off-by: Baolin Wang <baolin.wang@linaro.org>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
The RTC interrupt enable register is not put in always-power-on region
supplied by VDDRTC, so we should check if we need enable the alarm
interrupt when system booting.
Signed-off-by: Baolin Wang <baolin.wang@linaro.org>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
When registering one rtc device, it will check to see if there is an
alarm already set in rtc hardware by issuing __rtc_read_alarm(). So
we should not disable the RTC interrupts and clear the interrupts
status in probe() function.
Signed-off-by: Baolin Wang <baolin.wang@linaro.org>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
We should clear the SPG value update interrupt status once the SPG value
is updated successfully, in case incorrect status validation for next time.
Signed-off-by: Baolin Wang <baolin.wang@linaro.org>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Set wakeup capability before registering rtc device, in case the alarmtimer
can find one available rtc device.
Signed-off-by: Baolin Wang <baolin.wang@linaro.org>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Clang warns:
drivers/rtc/rtc-s35390a.c:124:27: warning: implicit conversion from
'int' to 'char' changes value from 192 to -64 [-Wconstant-conversion]
buf = S35390A_FLAG_RESET | S35390A_FLAG_24H;
~ ~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~
1 warning generated.
Update buf to be an unsigned 8-bit integer, which matches the buf member
in struct i2c_msg.
https://github.com/ClangBuiltLinux/linux/issues/145
Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
We should get 'driver_data' from 'struct device' directly. Going via
platform_device is an unneeded step back and forth.
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
In preparation to enabling -Wimplicit-fallthrough, mark switch cases
where we are expecting to fall through.
Notice that in this particular case, I replaced "Fall" with a proper
"Fall through" comment.
Addresses-Coverity-ID: 1373875 ("Missing break in switch")
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Instead of confusingly returning -EBUSY on failure to obtain an
interrupt, propagate the real error code. While at it, let the user know
why the interrupt could not be acquired.
Signed-off-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Fix a problem with commit 311ee9c151 ("rtc: cmos: allow using ACPI for
RTC alarm instead of HPET") defining `use_acpi_alarm' module parameter
even for non-ACPI platforms, which ignore it. Wrap the definition into
#ifdef CONFIG_ACPI and use a static inline wrapper function, hardcoded
to return 0 and consequently optimized away for !ACPI, following the
existing pattern with HPET handling functions.
Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org>
Fixes: 311ee9c151 ("rtc: cmos: allow using ACPI for RTC alarm instead of HPET")
Cc: stable@vger.kernel.org # 4.18+
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Fix a commit 311ee9c151 ("rtc: cmos: allow using ACPI for RTC alarm
instead of HPET") `rtc-cmos' regression causing a link error:
drivers/rtc/rtc-cmos.o: In function `cmos_platform_probe':
rtc-cmos.c:(.init.text+0x33c): undefined reference to `hpet_rtc_interrupt'
rtc-cmos.c:(.init.text+0x3f4): undefined reference to `hpet_rtc_interrupt'
with non-ACPI platforms using this driver. The cause is the change of
the condition guarding the use of `hpet_rtc_interrupt'.
Previously it was a call to `is_hpet_enabled'. That function is static
inline and has a hardcoded 0 result for non-ACPI platforms, which imply
!HPET_EMULATE_RTC. Consequently the compiler optimized the whole block
away including the reference to `hpet_rtc_interrupt', which never made
it to the link stage.
Now the guarding condition is a call to `use_hpet_alarm', which is not
static inline and therefore the compiler may not be able to prove that
it actually always returns 0 for non-ACPI platforms. Consequently the
build breaks with an unsatisfied reference, because `hpet_rtc_interrupt'
is nowhere defined at link time.
Fix the problem by marking `use_hpet_alarm' inline. As the `inline'
keyword serves as an optimization hint rather than a requirement the
compiler is still free to choose whether inlining will be beneficial or
not for ACPI platforms.
Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org>
Fixes: 311ee9c151 ("rtc: cmos: allow using ACPI for RTC alarm instead of HPET")
Cc: stable@vger.kernel.org # 4.18+
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Instead of lying to the core when the alarm is invalid, let it handle that
by returning the error.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Tested-by: Gregory CLEMENT <gregory.clement@bootlin.com> (on Armada 375 DB)
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Call the 64bit versions of rtc_time_to_tm now that the range is enforced by
the core.
Also remove the open coded rtc_tm_to_time64.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
rtc_time_to_tm always rturns a valid tm, there is no need to validate it.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Let the core handle offsetting and windowing the RTC range.
The RTC has a 24 bit counter for minutes plus a seconds counter.
Keep the epoch at the beginning of 2000.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Use rtc_add_group to add the sysfs group in a race free manner.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Instead of resetting the RTC to an bogus valid time, let userspace know
that the time is invalid when XSTP is set. Reset XSTP when setting the time
again.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
The name passed to devm_rtc_device_register is now unused. anyway, switch
to devm_rtc_allocate_device to avoid forward declaring rs5c348_driver.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Call the 64bit versions of rtc_time_to_tm and rtc_tm_to_time now that the
range is enforced by the core.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
The IRQ is requested before the struct rtc is allocated and registered, but
this struct is used in the IRQ handler. This may lead to a NULL pointer
dereference.
Switch to devm_rtc_allocate_device/rtc_register_device to allocate the rtc
before requesting the IRQ.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Register frequency test using rtc_add_group to avoid a possible race
condition and simplify the code.
This also moves the attribute to its proper location under the rtc device
instead of the i2c parent device.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Instead of adding a binary sysfs attribute from the driver, use the core to
register an nvmem device.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
/proc is not the correct ABI to display debugging info. Remove
RTC_DS1685_PROC_REGS as the driver hasn't seen any real development since
it was included.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
The license text is specifying GPL v2 only but the MODULE_LICENSE is set to
GPL which means GNU Public License v2 or later. When MODULE_LICENSE and
boiler plate does not match, go for boiler plate license.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
The default word_size and stride of 1 are correct for the tx4939. Also fix
the nvmem folder name.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
The core header file is reserved for the core, stop including it.
Also reorder includes alphabetically.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Move rtc_add_group and rtc_add_groups definition to rtc.h that is available
for all RTC drivers.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
On m41txx you can enable open-drain OUT pin to check if offset is ok.
Enabling OUT pin with frequency_test_enable attribute, OUT pin will tick
512 times faster than 1s tick base.
Enable or Disable FT bit on CONTROL register if freq_test is 1 or 0.
Signed-off-by: Giulio Benetti <giulio.benetti@micronovasrl.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
m41txx chips can hold a calibration value to get correct clock bias.
Add offset handling (ranging between -63ppm and 126ppm) via sysfs.
Signed-off-by: Giulio Benetti <giulio.benetti@micronovasrl.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Use rtc_add_group to add the common sysfs group to avoid a possible race
condition.
[Denis.Osterland@diehl.com: use to_i2c_client(dev->parent)]
Signed-off-by: Denis Osterland <Denis.Osterland@diehl.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
The move of atrim, dtrim usr sysfs properties from i2c device
to rtc device require to access them via dev->parent.
This patch also aligns timestamp0.
Stale mentions of irq_task are left in the kerneldoc after its removal.
Remove them.
There is still one indirect mention left but commit 3c8bb90efb ("rtc: Fix
hrtimer deadlock") can probably be reverted now.
Reported-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Ensure the non managed version of the un/registration functions is not used
anymore. No driver is using it anymore and they should not be necessary.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
The abx804 and abx805 chips have support for a simple watchdog
function that can trigger an external reset.
Signed-off-by: Jeremy Gebben <jgebben@sweptlaser.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
This will allow additional data to be tracked, for future
improvements.
Signed-off-by: Jeremy Gebben <jgebben@sweptlaser.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Switch to devm_rtc_allocate_device to simplify the erro and driver removal
paths.
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
The IRQ is requested before the struct rtc is allocated and registered, but
this struct is used in the IRQ handler. This may lead to a NULL pointer
dereference.
Switch to devm_rtc_allocate_device/rtc_register_device to allocate the rtc
before requesting the IRQ.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
The IRQ is requested before the struct rtc is allocated and registered, but
this struct is used in the IRQ handler. This may lead to a NULL pointer
dereference.
Switch to devm_rtc_allocate_device/rtc_register_device to allocate the rtc
before requesting the IRQ.
Acked-by: Eddie Huang <eddie.huang@mediatek.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Fixes gcc '-Wunused-but-set-variable' warning:
drivers/rtc/rtc-mrst.c: In function 'mrst_procfs':
drivers/rtc/rtc-mrst.c:264:29: warning:
variable 'valid' set but not used [-Wunused-but-set-variable]
unsigned char rtc_control, valid;
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
The Epson rx8803 is mostly similar to the Microcrystal RV8803 but the size
of the offset register is 4 bits vs 6 bits but it has a configurable
temperature compensation.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
devm_kcalloc() returns NULL, it never returns error pointers. In the
current code we would return PTR_ERR(NULL) which is success, instead of
returning the -ENOMEM error code.
Fixes: a0a1a1ba30 ("rtc: sysfs: facilitate attribute add to rtc device")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
One of the more common cases of allocation size calculations is finding
the size of a structure that has a zero-sized array at the end, along
with memory for some number of elements for that array. For example:
struct foo {
int stuff;
void *entry[];
};
instance = kzalloc(sizeof(struct foo) + sizeof(void *) * count, GFP_KERNEL);
Instead of leaving these open-coded and prone to type mistakes, we can
now use the new struct_size() helper:
instance = kzalloc(struct_size(instance, entry, count), GFP_KERNEL);
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Depending on MACH_INGENIC prevent us from creating a generic kernel that
works on more than one MIPS board. Instead, we just depend on MIPS being
set.
Signed-off-by: Paul Cercueil <paul@crapouillou.net>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Cut down the shutdown time from 2 seconds to 1 sec. In case of roll
over try again.
Signed-off-by: Keerthy <j-keerthy@ti.com>
Reviewed-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Use of_device_is_system_power_controller instead of manually reading
the system-power-controller property from the device tree node.
Reviewed-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Keerthy <j-keerthy@ti.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
mrst_read_time() is never called in atomic context.
It calls mdelay() to busily wait, which is not necessary.
mdelay() can be replaced with msleep().
This is found by a static analysis tool named DCNS written by myself.
Signed-off-by: Jia-Ju Bai <baijiaju1990@gmail.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Subsystem:
- new helpers to add custom sysfs attributes
- struct rtc_task removal along with rtc_irq_register/rtc_irq_unregister
- rtc_irq_set_state and rtc_irq_set_freq are not exported anymore
Drivers:
- armada38x: reset after rtc power loss
- ds1307: now supports m41t11
- isl1208: now supports isl1219 and tamper detection
- pcf2127: internal SRAM support
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Merge tag 'rtc-4.19' of git://git.kernel.org/pub/scm/linux/kernel/git/abelloni/linux
Pull RTC updates from Alexandre Belloni:
"It is now possible to add custom sysfs attributes while avoiding a
possible race condition. Unused code has been removed resulting in a
nice reduction of the code base. And more drivers have been switched
to SPDX by their maintainers.
Summary:
Subsystem:
- new helpers to add custom sysfs attributes
- struct rtc_task removal along with rtc_irq_[un]register()
- rtc_irq_set_state and rtc_irq_set_freq are not exported anymore
Drivers:
- armada38x: reset after rtc power loss
- ds1307: now supports m41t11
- isl1208: now supports isl1219 and tamper detection
- pcf2127: internal SRAM support"
* tag 'rtc-4.19' of git://git.kernel.org/pub/scm/linux/kernel/git/abelloni/linux: (34 commits)
rtc: ds1307: simplify hwmon config
rtc: s5m: Add SPDX license identifier
rtc: maxim: Add SPDX license identifiers
rtc: isl1219: add device tree documentation
rtc: isl1208: set ev-evienb bit from device tree
rtc: isl1208: Add "evdet" interrupt source for isl1219
rtc: isl1208: add support for isl1219 with tamper detection
rtc: sysfs: facilitate attribute add to rtc device
rtc: remove struct rtc_task
char: rtc: remove task handling
rtc: pcf85063: preserve control register value between stop and start
rtc: sh: remove unused variable rtc_dev
rtc: unexport rtc_irq_set_*
rtc: simplify rtc_irq_set_state/rtc_irq_set_freq
rtc: remove irq_task and irq_task_lock
rtc: remove rtc_irq_register/rtc_irq_unregister
rtc: sh: remove dead code
rtc: sa1100: don't set PIE frequency
rtc: ds1307: support m41t11 variant
rtc: ds1307: fix data pointer to m41t0
...
We don't have to define an extra config symbol, IS_REACHABLE does
what we need. And having this config symbol just to save the few
bytes of hwmon support on non-DS3231 chips isn't worth it IMO
(especially as the symbol is set per default).
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Add support to disable event in pull-up.
Signed-off-by: Denis Osterland <Denis.Osterland@diehl.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Add support for "evdet" named interrupt source.
The check if i2c client irq matches evdet irq is needed
for the case that there is only one interrupt named "evdet".
In this case i2c client code handles this like an unnamed
interrupt souce and assigns the value.
Signed-off-by: Denis Osterland <Denis.Osterland@diehl.com>
Reviewed-by: Michael Grzeschik <m.grzeschik@pengutronix.de>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
We add support for the ISL1219 chip that got an integrated tamper
detection function. This patch implements the feature by adding
an additional timestamp0 file to sysfs device path.
This file contains seconds since epoch, if an event occurred,
or is empty, if none occurred.
Signed-off-by: Michael Grzeschik <m.grzeschik@pengutronix.de>
Signed-off-by: Denis Osterland <Denis.Osterland@diehl.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
This patches addresses following problem:
rtc_allocate_device
devm_device_add_group <-- kernel oops / null pointer, because
sysfs entry does not yet exist
rtc_register_device
rc = devm_device_add_group
if (rc)
return rc; <-- forbidden to return error code
after device register
This patch adds rtc_add_group(s) functions.
The functions store the sum of attribute groups as device resource.
Signed-off-by: Denis Osterland <Denis.Osterland@diehl.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Fix a bug that caused the Control_1 register to get zeroed whenever the
RTC time is set. The problem occurred between stopping and starting the
RTC clock, wherein the return value of a successful I2C write function
would get written to the register.
Also update variables of the start and stop functions to be more
consistent with the rest of the driver.
Signed-off-by: Alvin Šipraga <alvin@airtame.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
When building rtc-sh, rtc_dev isn't used in function __sh_rtc_periodic.
drivers/rtc/rtc-sh.c: In function ‘__sh_rtc_periodic’:
drivers/rtc/rtc-sh.c:146:21: warning: unused variable ‘rtc_dev’ [-Wunused-variable]
struct rtc_device *rtc_dev = rtc->rtc_dev;
^~~~~~~
Remove the declaration of rtc_dev to dispose the warning.
Fixes: ec623ff014 ("rtc: sh: remove dead code")
Signed-off-by: Anders Roxell <anders.roxell@linaro.org>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Since commit 80d4bb515b ("RTC: Cleanup rtc_class_ops->irq_set_state") and
commit 696160fec1 ("RTC: Cleanup rtc_class_ops->irq_set_freq()"),
sh_rtc_irq_set_state and sh_rtc_irq_set_freq are never called. Remove them
along with task handling.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
It doesn't make sense to set the PIE frequency from the driver. Let
userspace do its job.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
The m41t11 variant is very similar to the already supported m41t00 and
m41t0, but it has also 56 bytes of NVRAM.
Add it to driver taking into account NVRAM section.
Signed-off-by: Giulio Benetti <giulio.benetti@micronovasrl.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
data field points to m41t00, instead it should point to m41t0.
Driver works correctly because on both cases(m41t0 and m41t00) chip_desc
are equal.
Point to right enum m41t0 instead of m41t00.
Signed-off-by: Giulio Benetti <giulio.benetti@micronovasrl.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
getnstimeofday64() is just a wrapper around the ktime accessor, so
we should use that directly.
I considered using ktime_get_boottime_ts64() (to avoid leap second
problems) or ktime_get_real_seconds() (to simplify the calculation,
but in the end concluded that the existing interface is probably
the most appropriate in this case.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
The offset needs to be added after reading the alarm value.
It also needs to be subtracted after the now < alarm test.
Tested-by: Jon Hunter <jonathanh@nvidia.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Pointer 'name' is being assigned but is never used hence it is redundant
and can be removed.
Cleans up clang warning:
warning: variable 'name' set but not used [-Wunused-but-set-variable]
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Drop unnecessary register write-unlock around two read accesses.
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
For completeness re-lock the registers also in the power-off error path.
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Do not set the system power-off callback and omap power-off rtc pointer
until we're done setting up our device to avoid leaving stale pointers
around after a late probe error.
Fixes: 97ea1906b3 ("rtc: omap: Support ext_wakeup configuration")
Cc: stable <stable@vger.kernel.org> # 4.9
Cc: Marcin Niestroj <m.niestroj@grinn-global.com>
Cc: Tony Lindgren <tony@atomide.com>
Signed-off-by: Johan Hovold <johan@kernel.org>
Acked-by: Tony Lindgren <tony@atomide.com>
Reviewed-by: Marcin Niestroj <m.niestroj@grinn-global.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
The array pdev is local to the source and does not need to be in
global scope, so make it static.
Cleans up sparse warning:
symbol 'pdev' was not declared. Should it be static?
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
When the RTC block looses power it needs a reset sequence to make it
usable again. Otherwise, writes to the time register have no effect.
This reset sequence combines information from the mvebu_rtc driver in
the Marvell provided U-Boot, and the SolidRun provided U-Boot repo.
Tested on the Armada 388 based SolidRun Clearfog Base.
Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Acked-by: Gregory CLEMENT <gregory.clement@bootlin.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
As pointed out in the added comment resetting the rtc also stops the
included watchdog. This is bad if the bootloader started the watchdog to
secure the boot process. So don't reset if the watchdog is running.
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Acked-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
The PCF2127 has 512 bytes of internal static RAM and this patch expands
the driver to access this memory.
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
In order to read correctly from asynchronously updated RTC registers,
it's necessary to read repeatedly until their values do not change from
read to read. It's also necessary to wait for three RTC clock ticks for
certain operations. There are no timeouts in this code and these
operations could possibly loop forever.
To avoid kernel hangs, put in timeouts.
The iMX7d can be configured to stop the SRTC on a tamper event, which
will lockup the kernel inside this driver as described above.
These hangs can happen when running under qemu, which doesn't emulate
the SNVS RTC, though currently the driver will refuse to load on qemu
due to a timeout in the driver probe method.
It could also happen if the SRTC block where somehow placed into reset
or the slow speed clock that drives the SRTC counter (but not the CPU)
were to stop.
The symptoms on a two core iMX7d are a work queue hang on
rtc_timer_do_work(), which eventually blocks a systemd fsnotify
operation that triggers a work queue flush, causing systemd to hang and
thus causing all services that should be started by systemd, like a
console getty, to fail to start or stop.
Also optimize the wait code to wait less. It only needs to wait for the
clock to advance three ticks, not to see it change three times.
Cc: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Cc: Fabio Estevam <fabio.estevam@nxp.com>
Cc: Shawn Guo <shawn.guo@linaro.org>
Cc: Bryan O'Donoghue <pure.logic@nexus-software.ie>
Signed-off-by: Trent Piepho <tpiepho@impinj.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
When devm_ioremap fails, the lack of error-handling code may
cause unexpected results.
This patch adds error-handling code after calling devm_ioremap.
Signed-off-by: Zhouyang Jia <jiazhouyang09@gmail.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
At over 4000 #includes, <linux/platform_device.h> is the 9th most
#included header file in the Linux kernel. It does not need
<linux/mod_devicetable.h>, so drop that header and explicitly add
<linux/mod_devicetable.h> to source files that need it.
4146 #include <linux/platform_device.h>
After this patch, there are 225 files that use <linux/mod_devicetable.h>,
for a reduction of around 3900 times that <linux/mod_devicetable.h>
does not have to be read & parsed.
225 #include <linux/mod_devicetable.h>
This patch was build-tested on 20 different arch-es.
It also makes these drivers SubmitChecklist#1 compliant.
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Reported-by: kbuild test robot <lkp@intel.com> # drivers/media/platform/vimc/
Reported-by: kbuild test robot <lkp@intel.com> # drivers/pinctrl/pinctrl-u300.c
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
We should be returning "retval". The "mrst_rtc.rtc" variable is a valid
pointer.
Fixes: 32b41f93dc ("rtc: mrst: switch to devm functions")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Access to the control registers is mostly not needed and can cause runtime
issues (like missed interrupts). Remove this debugging interface.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
The driver exposes an undocumented ABI to access the date and time
registers. It is not actually used by any userspace tools. Remove it.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Subsystem:
- rework of the rtc-test driver which allows to test the core more thoroughly
- rtc_set_alarm() now fails early when alarms are not supported
Drivers:
- mktime is now replaced by mktime64
- RTC range added for 88pm80x, ab-b5ze-s3, at91rm9200, brcmstb-waketimer,
ds1685, ftrtc010, ls1x, mxc_v2, rx8581, sprd, st-lpc, tps6586x, tps65910 and
vr41xx
- Fixed a possible race condition in probe functions
- pxa: fix the probe function that is broken since v4.3
- stm32: now supports stm32mp1
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Merge tag 'rtc-4.18' of git://git.kernel.org/pub/scm/linux/kernel/git/abelloni/linux
Pull RTC updates from Alexandre Belloni:
"Setting the supported range from drivers for RTCs failing soon has
started. A few fixes are developed along the way. Some drivers have
been switched to SPDX by their maintainers.
Subsystem:
- rework of the rtc-test driver which allows to test the core more
thoroughly
- rtc_set_alarm() now fails early when alarms are not supported
Drivers:
- mktime() is now replaced by mktime64()
- RTC range added for 88pm80x, ab-b5ze-s3, at91rm9200,
brcmstb-waketimer, ds1685, ftrtc010, ls1x, mxc_v2, rx8581, sprd,
st-lpc, tps6586x, tps65910 and vr41xx
- fixed a possible race condition in probe functions
- pxa: fix the probe function that is broken since v4.3
- stm32: now supports stm32mp1"
* tag 'rtc-4.18' of git://git.kernel.org/pub/scm/linux/kernel/git/abelloni/linux: (78 commits)
rtc: pxa: fix probe function
rtc: cros-ec: Switch to SPDX identifier.
rtc: cros-ec: Make license text and module license match.
rtc: ensure rtc_set_alarm fails when alarms are not supported
rtc: test: remove alarm support from the first device
rtc: test: convert to devm_rtc_allocate_device
rtc: ftrtc010: let the core handle range
rtc: ftrtc010: handle dates after 2106
rtc: ftrtc010: switch to devm_rtc_allocate_device
rtc: mrst: switch to devm functions
rtc: sunxi: fix possible race condition
rtc: test: remove irq sysfs file
rtc: test: emulate alarms using timers
rtc: test: store time as an offset to system time
rtc: test: allow registering many devices
rtc: test: remove useless proc info
rtc: ds1685: Add range
rtc: ds1685: fix possible race condition
rtc: sprd: Add new RTC power down check method
rtc: sun6i: Fix bit_idx value for clk_register_gate
...
This patch is from static analysis and I don't have the hardware to
to test it. I think the test is reversed so now the probe function
will return success early and the last part of the function is dead
code.
Fixes: 3cdf4ad963 ("rtc: pxa: convert to use shared sa1100 functions")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
The license text is specifying "GPLv2" but the MODULE_LICENSE is set to
GPL which means GNU Public License v2 or later. When MODULE_LICENSE and
boiler plate does not match, go for boiler plate license.
Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
When using RTC_ALM_SET or RTC_WKALM_SET with rtc_wkalrm.enabled not set,
rtc_timer_enqueue() is not called and rtc_set_alarm() may succeed but the
subsequent RTC_AIE_ON ioctl will fail. RTC_ALM_READ would also fail in that
case.
Ensure rtc_set_alarm() fails when alarms are not supported to avoid letting
programs think the alarms are working for a particular RTC when they are
not.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
To test for issues with RTCs that don't provide an alarm, remove alarm
support from the first test RTC device.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
The current range handling is highly suspicious. Anyway, let the core
handle it.
The RTC has a 32 bit counter on top of days + hh:mm:ss registers.
Acked-by: Hans Ulli Kroll <ulli.kroll@googlemail.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Use correct types for offset and time and use
rtc_time64_to_tm/rtc_tm_to_time64 to handle dates after 2106 properly.
Acked-by: Hans Ulli Kroll <ulli.kroll@googlemail.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Switch to devm_rtc_allocate_device/rtc_register_device. This allow or
further improvement and simplifies ftrtc010_rtc_remove().
Acked-by: Hans Ulli Kroll <ulli.kroll@googlemail.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
- Use overflow helpers in 2-factor allocators (Kees, Rasmus)
- Introduce overflow test module (Rasmus, Kees)
- Introduce saturating size helper functions (Matthew, Kees)
- Treewide use of struct_size() for allocators (Kees)
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Merge tag 'overflow-v4.18-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux
Pull overflow updates from Kees Cook:
"This adds the new overflow checking helpers and adds them to the
2-factor argument allocators. And this adds the saturating size
helpers and does a treewide replacement for the struct_size() usage.
Additionally this adds the overflow testing modules to make sure
everything works.
I'm still working on the treewide replacements for allocators with
"simple" multiplied arguments:
*alloc(a * b, ...) -> *alloc_array(a, b, ...)
and
*zalloc(a * b, ...) -> *calloc(a, b, ...)
as well as the more complex cases, but that's separable from this
portion of the series. I expect to have the rest sent before -rc1
closes; there are a lot of messy cases to clean up.
Summary:
- Introduce arithmetic overflow test helper functions (Rasmus)
- Use overflow helpers in 2-factor allocators (Kees, Rasmus)
- Introduce overflow test module (Rasmus, Kees)
- Introduce saturating size helper functions (Matthew, Kees)
- Treewide use of struct_size() for allocators (Kees)"
* tag 'overflow-v4.18-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux:
treewide: Use struct_size() for devm_kmalloc() and friends
treewide: Use struct_size() for vmalloc()-family
treewide: Use struct_size() for kmalloc()-family
device: Use overflow helpers for devm_kmalloc()
mm: Use overflow helpers in kvmalloc()
mm: Use overflow helpers in kmalloc_array*()
test_overflow: Add memory allocation overflow tests
overflow.h: Add allocation size calculation helpers
test_overflow: Report test failures
test_overflow: macrofy some more, do more tests for free
lib: add runtime test of check_*_overflow functions
compiler.h: enable builtin overflow checkers and add fallback code
The IRQ is requested before the struct rtc is allocated and registered, but
this struct is used in the IRQ handler. This may lead to a NULL pointer
dereference.
Switch to devm_rtc_allocate_device/rtc_register_device to allocate the rtc
before requesting the IRQ.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Acked-by: Maxime Ripard <maxime.ripard@bootlin.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Now that alarms are emulated, remove the irq sysfs file that could be used
to send alarms.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Use timers to emulate alarms. Note that multiple alarms may happen if they
are set more than 15 days after the current RTC time.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Store the time as an offset to system time. As the offset is in second, it
is currently always synced with system time.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
The rtc proc callback is useless for two reasosn:
- the test RTC is often not the first RTC so it will never be used
- all the info is available in the name file of the RTC sys folder
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
The IRQ is requested before the struct rtc is allocated and registered, but
this struct is used in the IRQ handler.
Switch to devm_rtc_allocate_device/rtc_register_device to allocate the rtc
before requesting the IRQ.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
We should use the new method to check if RTC was powered down, which
is more solid. Since we have introduced power control and power status
registers, and we just check if the power status is the default value
(0x96), if yes that means the RTC has been powered down. Meanwhile We
can set the power control register to be one valid value to change
the power status to indicate RTC device is valid now.
Signed-off-by: Baolin Wang <baolin.wang@linaro.org>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
clk-gate core will take bit_idx through clk_register_gate
and then do clk_gate_ops by using BIT(bit_idx), but rtc-sun6i
is passing bit_idx as BIT(bit_idx) it becomes BIT(BIT(bit_idx)
which is wrong and eventually external gate clock is not enabling.
This patch fixed by passing bit index and the original change
introduced from below commit.
"rtc: sun6i: Add support for the external oscillator gate"
(sha1: 17ecd24641)
Signed-off-by: Michael Trimarchi <michael@amarulasolutions.com>
Fixes: 17ecd24641 ("rtc: sun6i: Add support for the external oscillator gate")
Cc: stable@vger.kernel.org
Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Acked-by: Maxime Ripard <maxime.ripard@bootlin.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Fix typo introduced for RTC_DRV_JZ4740 in commit 586655d278 ("rtc:
jz4740: make the driver buildable as a module again").
Signed-off-by: Mathieu Malaterre <malat@debian.org>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
There is no point in testing .set_mmss versus .set_mmss64 as there are both
taking the exact same argument (truncated for set_mmss though).
Also, this allows to constify struct rtc_ops.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
The RTC has a 64 bit counter.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Acked-by: Patrice Chotard <patrice.chotard@st.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
The IRQ is requested before the struct rtc is allocated and registered, but
this struct is used in the IRQ handler. This may lead to a NULL pointer
dereference.
Switch to devm_rtc_allocate_device/rtc_register_device to allocate the rtc
before requesting the IRQ.
Acked-by: Patrice Chotard <patrice.chotard@st.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
This patch adds support for stm32mp1 RTC.
Some common registers with previous RTC version have a different offset.
It is the case for Control Register (CR) and ALaRMA Register (ALRMAR).
There are also new registers regarding event flags: now, Alarm event flag
is in Status Register (SR) and write 1 in Status Clear Register (SCR) is
required to clear the event.
Signed-off-by: Amelie Delaunay <amelie.delaunay@st.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
This patch reworks register/bits management because next version of RTC
uses the same way of working but with different register's offset or bits
moved in new registers.
Signed-off-by: Amelie Delaunay <amelie.delaunay@st.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
This patch cleans the following checkpatch complaints:
CHECK: 'initalized' may be misspelled - perhaps 'initialized'?
#644: FILE: drivers/rtc/rtc-stm32.c:644:
+ * the calendar has been initalized or not. INITS flag is reset by a
CHECK: Alignment should match open parenthesis
#669: FILE: drivers/rtc/rtc-stm32.c:669:
+ rtc->rtc_dev = devm_rtc_device_register(&pdev->dev, pdev->name,
+ &stm32_rtc_ops, THIS_MODULE);
Signed-off-by: Amelie Delaunay <amelie.delaunay@st.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
nvmem_register() never returns NULL, so IS_ERR is good enough here.
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
nvmem_register() assumes these values to be 1 if unset, so they don't
need to be set explicitly.
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
This RTC is a 32-bit second counter.
This also solves an issue where mxc_rtc_set_alarm() can return with the
lock taken.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
The IRQ is requested before the struct rtc is allocated and registered, but
this struct is used in the IRQ handler. This may lead to a NULL pointer
dereference.
Switch to devm_rtc_allocate_device/rtc_register_device to allocate the rtc
before requesting the IRQ.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
While the year is encoded on 32 bits in SYS_TOYWRITE1i/SYS_TOYREAD1. The
Loongson 1c datasheet states that the range is from 0 to 99.
The current code exceeds this range and seems to be working, I deduce that
the leap year algorithm will fail in 2100.
Anyway, alarm registers only encode the year on 14 bits so with alarm
support, the range will always be limited to 0 to 16383.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
The error handling in ls1x_rtc_probe used to release resources but since
it is using devm functions, it only returns a value. Make the code clearer
by returning directly instead of using goto.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Let the core handle offsetting and windowing the RTC range.
The RTC has a 40-bit counter counting at 1024 Hz. So its maximum value is
2^(40-10) - 1. Also, let the core handle the offset instead of coding it in
the callbacks. Keep the default epoch at the beginning of 2009 (this will
fail in 2043).
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
The probe function is not allowed to fail after the RTC is registered
because the following may happen:
CPU0: CPU1:
sys_load_module()
do_init_module()
do_one_initcall()
cmos_do_probe()
rtc_device_register()
__register_chrdev()
cdev->owner = struct module*
open("/dev/rtc0")
rtc_device_unregister()
module_put()
free_module()
module_free(mod->module_core)
/* struct module *module is now
freed */
chrdev_open()
spin_lock(cdev_lock)
cdev_get()
try_module_get()
module_is_live()
/* dereferences already
freed struct module* */
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
The vr41xx RTC is a 48-bit counter counting at 32.768 kHz, giving a maximum
value of 2^(48-15)-1 seconds.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
The probe function is not allowed to fail after the RTC is registered
because the following may happen:
CPU0: CPU1:
sys_load_module()
do_init_module()
do_one_initcall()
cmos_do_probe()
rtc_device_register()
__register_chrdev()
cdev->owner = struct module*
open("/dev/rtc0")
rtc_device_unregister()
module_put()
free_module()
module_free(mod->module_core)
/* struct module *module is now
freed */
chrdev_open()
spin_lock(cdev_lock)
cdev_get()
try_module_get()
module_is_live()
/* dereferences already
freed struct module* */
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
rx8581_get_datetime and rx8581_set_datetime are only used after casting dev
to an i2c_client. Remove that useless indirection.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Currently, the IRQs are disabled when the rtc driver is removed (e.g. when
shutting down the platform).
This means that the RTC will be unable to power up the platform.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
The IRQ is requested before the struct rtc is allocated and registered, but
this struct is used in the IRQ handler. This may lead to a NULL pointer
dereference.
Switch to devm_rtc_allocate_device/rtc_register_device to allocate the rtc
before requesting the IRQ.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
The ab-b5ze-s3 RTC is storing the year in an 8bit bcd coded register so it
can handle dates from year 2000 to year 2099.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
The IRQ is requested before the struct rtc is allocated and registered, but
this struct is used in the IRQ handler. This may lead to a NULL pointer
dereference.
Also, the probe function is not allowed to fail after the RTC is registered
because the following may happen:
CPU0: CPU1:
sys_load_module()
do_init_module()
do_one_initcall()
cmos_do_probe()
rtc_device_register()
__register_chrdev()
cdev->owner = struct module*
open("/dev/rtc0")
rtc_device_unregister()
module_put()
free_module()
module_free(mod->module_core)
/* struct module *module is now
freed */
chrdev_open()
spin_lock(cdev_lock)
cdev_get()
try_module_get()
module_is_live()
/* dereferences already
freed struct module* */
Switch to devm_rtc_allocate_device/rtc_register_device to allocate the rtc
before requesting the IRQ and register the RTC as late as possible.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Now that the RTC range is properly checked, convert the driver to
rtc_tm_to_time64/rtc_time64_to_tm
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
The 88pm80x RTC is storing the time as a 32bit offset from a 32bit counter
so it can handle dates from 0 to U32_MAX.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
The IRQ is requested before the struct rtc is allocated and registered, but
this struct is used in the IRQ handler. This may lead to a NULL pointer
dereference.
Switch to devm_rtc_allocate_device/rtc_register_device to allocate the rtc
before requesting the IRQ.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
It doesn't make sense to set the RTC to a default value at probe time. Let
the core handle invalid date and time.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
And stop trying to get a reference on the submodule, procfs code deals
with release after an unloaded module and thus removed proc entry.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
RTC driver should not be aware of the PWR registers offset and bits
position. Furthermore, we can imagine that DBP relative register and bit
mask could change depending on the SoC.
So this patch introduces 2 parameters, dbp_reg and dbp_mask, allowing to
get PWR_CR and PWR_CR_DBP from device tree. And it prepares next RTC
version, backup domain write protection is disabled only if needed.
Signed-off-by: Amelie Delaunay <amelie.delaunay@st.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
RTC alarm interrupt is active high and already configured by device tree.
So remove IRQF_TRIGGER_RISING from driver.
Signed-off-by: Amelie Delaunay <amelie.delaunay@st.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
The tps6586x use a 64-bit 'epoch_start' value, but then computes that
value using an 'mktime()', which has a smaller range and overflows
in 2106 at the latest. As both the hardware and the subsystem interface
support wider than 32-bit ranges for rtc times here, let's change all
the operations on 'seconds' to time64_t.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
The loongson1 platform is 32-bit, so storing a time value in 32 bits
suffers from limited range. In this case it is likely to be correct
until 2106, but it's better to avoid the limitation and just use
the time64_t based mktime64() and rtc_time64_to_tm() interfaces.
The hardware uses a 32-bit year number, and time64_t can cover that
entire range.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
This driver uses mktime() and rtc_time_to_tm() to convert between time
values. This works fine on 64-bit kernels over the whole supported
range, and the vr41xx chip is a 64-bit MIPS implementation, but it is
inconsistent because it doesn't do the same thing on 32-bit kernels that
overflow in 2106 or 2038.
Changing it to use mktime64/rtc_time64_to_tm() should have no visible
impact on vr41xx but gets us closer to removing the 32-bit interfaces.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
The SC27xx RTC can support dates from 1970-01-01 00:00:00 to 2149-06-06
23:59:59.
Signed-off-by: Baolin Wang <baolin.wang@linaro.org>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
This is a preparation patch, changing to use devm_rtc_allocate_device()
that can allow driver to set 'range_max' and 'range_min' for the RTC
device.
Signed-off-by: Baolin Wang <baolin.wang@linaro.org>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
We should get drvdata from struct device directly. Going via
platform_device is an unneeded step back and forth.
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Acked-by: Michal Simek <michal.simek@xilinx.com> (for zynqmp)
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
The OPAL RTC driver does not sleep in case it gets OPAL_BUSY or
OPAL_BUSY_EVENT from firmware, which causes large scheduling
latencies, up to 50 seconds have been observed here when RTC stops
responding (BMC reboot can do it).
Fix this by converting it to the standard form OPAL_BUSY loop that
sleeps.
Fixes: 628daa8d5a ("powerpc/powernv: Add RTC and NVRAM support plus RTAS fallbacks")
Cc: stable@vger.kernel.org # v3.2+
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Acked-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Use ACPI for RTC Alarm only for Intel platforms
1. with Low Power S0 support
2. with HPET RTC emulation enabled
3. no earlier than 2015
Note that, during the test, it is found that this patch
1. works in 4.15-rc kernel
2. hangs the platform after suspend-to-idle for 2 or 3 times, in 4.15.0
3. works again in 4.16-rc3 kernel.
4. works in the latest 4.15.12 stable kernel.
Thus although this patch breaks 4.15.0 kernel for some unknown reason,
still, it is safe for both upstream and backport.
Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Previously, the RTC alarm is acknowledged either by the cmos rtc irq
handler, or by the hpet rtc irq handler.
When using ACPI RTC Fixed event as the RTC alarm, the RTC alarm is
acknowledged by the ACPI RTC event handler, as addressed in the previous
patch.
But, when resume from suspend-to-ram (ACPI S3), the ACPI SCI is cleared
right after resume, thus the ACPI RTC event handler is not invoked at all,
results in the RTC Alarm unacknowledged.
Handle this by comparing the current time and the RTC Alarm time in the
rtc_cmos driver .resume() callback
1. Assume the wakeup event has already been fired if the RTC Alarm time
is earlier than/equal to the current time, and ACK the RTC Alarm.
2. Assume the wakeup event has not been fired if the RTC Alarm time
is later than current time, and re-arm it if needed.
Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
It's found that the HPET timer prevents the platform from entering
Low Power S0 on some new Intel platforms.
This means that
1. users can still use RTC wake Alarm for suspend-to-idle, but the system
never enters Low Power S0, which is a waste of power.
or
2. if users want to put the system into Low Power S0, they can not use
RTC as the wakeup source.
To fix this, we need to stop using the HPET timer for wake alarm.
But disabling CONFIG_HPET_EMULATE_RTC is not an option because HPET
emulates PIT at the same time, and this is needed on some of these
platforms.
Thus, introduce a new mode (use_acpi_alarm) to the rtc_cmos driver,
so that, even with CONFIG_HPET_EMULATE_RTC enabled, it's still possible to
use ACPI SCI for RTC Alarm, including UIE/AIE/wkalrm, instead of HPET.
Only necessary changes are made for the new "use_acpi_alarm" mode, including
1. drop all the calls to HPET emulation code, including the HPET irq
handler for rtc interrupt.
2. enabling/disabling ACPI RTC Fixed event upon RTC UIE/AIE request.
3. acknowledge the RTC Alarm in ACPI RTC Fixed event handler.
There is no functional change made in this patch if the new mode is not
enabled.
Note: this "use_acpi_alarm" mode is made based on the assumption that
ACPI RTC Fixed event is reliable both at runtime and during system wakeup.
And this has been verified on a couple of platforms I have, including
a MS Surface Pro 4 (SKL), a Lenovo Yoga 900 (SKL), and a HP 9360 (KBL).
Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
The core driver should create and manage irq mappings instead of
leaf drivers. This patch change to pass irq domain to
devm_mfd_add_devices() and it will create mapping for irq resources
automatically. And remove irq mapping in rtc driver since this has
been done in core driver.
Signed-off-by: Chen Zhong <chen.zhong@mediatek.com>
Acked-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Subsystem:
- Add tracepoints
- Rework of the RTC/nvmem API to allow drivers to discard struct nvmem_config
after registration
- New range API, drivers can now expose the useful range of the RTC
- New offset API the core is now able to add an offset to the RTC time,
modifying the supported range.
- Multiple rtc_time64_to_tm fixes
- Handle time_t overflow on 32 bit platforms in the core instead of letting
drivers do crazy things.
- remove rtc_control API
New driver:
- Intersil ISL12026
Drivers:
- Drivers exposing the RTC non volatile memory have been converted to use nvmem
- Removed useless time and date validation
- Removed an indirection pattern that was a cargo cult from ancient drivers
- Removed VLA usage
- Fixed a possible race condition in probe functions
- AB8540 support is dropped from ab8500
- pcf85363 now has alarm support
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Merge tag 'rtc-4.17' of git://git.kernel.org/pub/scm/linux/kernel/git/abelloni/linux
Pull RTC updates from Alexandre Belloni:
"This contains a few series that have been in preparation for a while
and that will help systems with RTCs that will fail in 2038, 2069 or
2100.
Subsystem:
- Add tracepoints
- Rework of the RTC/nvmem API to allow drivers to discard struct
nvmem_config after registration
- New range API, drivers can now expose the useful range of the RTC
- New offset API the core is now able to add an offset to the RTC
time, modifying the supported range.
- Multiple rtc_time64_to_tm fixes
- Handle time_t overflow on 32 bit platforms in the core instead of
letting drivers do crazy things.
- remove rtc_control API
New driver:
- Intersil ISL12026
Drivers:
- Drivers exposing the RTC non volatile memory have been converted to
use nvmem
- Removed useless time and date validation
- Removed an indirection pattern that was a cargo cult from ancient
drivers
- Removed VLA usage
- Fixed a possible race condition in probe functions
- AB8540 support is dropped from ab8500
- pcf85363 now has alarm support"
* tag 'rtc-4.17' of git://git.kernel.org/pub/scm/linux/kernel/git/abelloni/linux: (128 commits)
rtc: snvs: Fix usage of snvs_rtc_enable
rtc: mt7622: fix module autoloading for OF platform drivers
rtc: isl12022: use true and false for boolean values
rtc: ab8500: Drop AB8540 support
rtc: remove a warning during scripts/kernel-doc step
rtc: 88pm860x: remove artificial limitation
rtc: 88pm80x: remove artificial limitation
rtc: st-lpc: remove artificial limitation
rtc: mrst: remove artificial limitation
rtc: mv: remove artificial limitation
rtc: hctosys: Ensure system time doesn't overflow time_t
parisc: time: stop validating rtc_time in .read_time
rtc: pcf85063: fix clearing bits in pcf85063_start_clock
rtc: at91sam9: Set name of regmap_config
rtc: s5m: Remove VLA usage
rtc: s5m: Move enum from rtc.h to rtc-s5m.c
rtc: remove VLA usage
rtc: Add useful timestamp definitions
rtc: Add one offset seconds to expand RTC range
rtc: Factor out the RTC range validation into rtc_valid_range()
...
Pull trivial tree updates from Jiri Kosina.
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial:
kfifo: fix inaccurate comment
tools/thermal: tmon: fix for segfault
net: Spelling s/stucture/structure/
edd: don't spam log if no EDD information is present
Documentation: Fix early-microcode.txt references after file rename
tracing: Block comments should align the * on each line
treewide: Fix typos in printk
GenWQE: Fix a typo in two comments
treewide: Align function definition open/close braces
commit 179a502f8c ("rtc: snvs: add Freescale rtc-snvs driver") introduces
the SNVS RTC driver with a function snvs_rtc_enable().
snvs_rtc_enable() can return an error on the enable path however this
driver does not currently trap that failure on the probe() path and
consequently if enabling the RTC fails we encounter a later error spinning
forever in rtc_write_sync_lp().
[ 36.093481] [<c010d630>] (__irq_svc) from [<c0c2e9ec>] (_raw_spin_unlock_irqrestore+0x34/0x44)
[ 36.102122] [<c0c2e9ec>] (_raw_spin_unlock_irqrestore) from [<c072e32c>] (regmap_read+0x4c/0x5c)
[ 36.110938] [<c072e32c>] (regmap_read) from [<c085d0f4>] (rtc_write_sync_lp+0x6c/0x98)
[ 36.118881] [<c085d0f4>] (rtc_write_sync_lp) from [<c085d160>] (snvs_rtc_alarm_irq_enable+0x40/0x4c)
[ 36.128041] [<c085d160>] (snvs_rtc_alarm_irq_enable) from [<c08567b4>] (rtc_timer_do_work+0xd8/0x1a8)
[ 36.137291] [<c08567b4>] (rtc_timer_do_work) from [<c01441b8>] (process_one_work+0x28c/0x76c)
[ 36.145840] [<c01441b8>] (process_one_work) from [<c01446cc>] (worker_thread+0x34/0x58c)
[ 36.153961] [<c01446cc>] (worker_thread) from [<c014aee4>] (kthread+0x138/0x150)
[ 36.161388] [<c014aee4>] (kthread) from [<c0107e14>] (ret_from_fork+0x14/0x20)
[ 36.168635] rcu_sched kthread starved for 2602 jiffies! g496 c495 f0x2 RCU_GP_WAIT_FQS(3) ->state=0x0 ->cpu=0
[ 36.178564] rcu_sched R running task 0 8 2 0x00000000
[ 36.185664] [<c0c288b0>] (__schedule) from [<c0c29134>] (schedule+0x3c/0xa0)
[ 36.192739] [<c0c29134>] (schedule) from [<c0c2db80>] (schedule_timeout+0x78/0x4e0)
[ 36.200422] [<c0c2db80>] (schedule_timeout) from [<c01a7ab0>] (rcu_gp_kthread+0x648/0x1864)
[ 36.208800] [<c01a7ab0>] (rcu_gp_kthread) from [<c014aee4>] (kthread+0x138/0x150)
[ 36.216309] [<c014aee4>] (kthread) from [<c0107e14>] (ret_from_fork+0x14/0x20)
This patch fixes by parsing the result of rtc_write_sync_lp() and
propagating both in the probe and elsewhere. If the RTC doesn't start we
don't proceed loading the driver and don't get into this loop mess later
on.
Fixes: 179a502f8c ("rtc: snvs: add Freescale rtc-snvs driver")
Signed-off-by: Bryan O'Donoghue <pure.logic@nexus-software.ie>
Acked-by: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
It's required to create a modules.alias via MODULE_DEVICE_TABLE helper
for the OF platform driver. Otherwise, module autoloading cannot work.
Signed-off-by: Sean Wang <sean.wang@mediatek.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Assign true or false to boolean variables instead of an integer value.
This issue was detected with the help of Coccinelle.
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
The AB8540 was an evolved version of the AB8500, but it was never
mass produced or put into products, only reference designs exist.
The upstream support was never completed and it is unlikely that
this will happen so drop the support for now to simplify
maintenance of the AB8500.
Cc: Loic Pallardy <loic.pallardy@st.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
During compilation using W=1 one would get:
drivers/rtc/systohc.c:11: info: Scanning doc for rtc_set_ntp_time
drivers/rtc/systohc.c:23: warning: bad line: (
Signed-off-by: Mathieu Malaterre <malat@debian.org>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
The 88pm860x supports time up to 2106 (it is a 32 bit counter). Also, the
year will never be before 1970 as the RTC core forbids that.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
The 88pm80x supports time up to 2106 (it is a 32 bit counter). Also, the
year will never be before 1970 as the RTC core forbids that.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
The LPC RTC supports dates way beyond 2038, don't limit it artificially as
the kernel handles dates after 2038 properly.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Dates after 2038 actually fit on 32 bits. The counter will overflow in
2106. Also, it is bad practice to reset the RTC to a default value.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
On 32bit platforms, time_t is still a signed 32bit long. If it is
overflowed, userspace and the kernel cant agree on the current system time.
This causes multiple issues, in particular with systemd:
https://github.com/systemd/systemd/issues/1143
A good workaround is to simply avoid using hctosys which is something I
greatly encourage as the time is better set by userspace.
However, many distribution enable it and use systemd which is rendering the
system unusable in case the RTC holds a date after 2038 (and more so after
2106). Many drivers have workaround for this case and they should be
eliminated so there is only one place left to fix when userspace is able to
cope with dates after the 31bit overflow.
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
The blackfin architecture is getting removed, so this one is
now obsolete.
Acked-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Acked-by: Aaron Wu <aaron.wu@analog.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
The tile architecture is getting removed, so this driver is
no longer needed.
Acked-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
A lot of Kconfig symbols have architecture specific dependencies.
In those cases that depend on architectures we have already removed,
they can be omitted.
Acked-by: Kalle Valo <kvalo@codeaurora.org>
Acked-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Some functions definitions have either the initial open brace and/or
the closing brace outside of column 1.
Move those braces to column 1.
This allows various function analyzers like gnu complexity to work
properly for these modified functions.
Signed-off-by: Joe Perches <joe@perches.com>
Acked-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Acked-by: Paul Moore <paul@paul-moore.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Acked-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Acked-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Acked-by: Martin K. Petersen <martin.petersen@oracle.com>
Acked-by: Takashi Iwai <tiwai@suse.de>
Acked-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Nicolin Chen <nicoleotsuka@gmail.com>
Acked-by: Martin K. Petersen <martin.petersen@oracle.com>
Acked-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Bit clear operation was missing ~
Signed-off-by: Michael McCormick <michael.mccormick@enatel.net>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
We are now allowing to register debugfs without a valid device, and not
having a valid name will end up using "dummy*" to create debugfs dir.
Signed-off-by: Jeffy Chen <jeffy.chen@rock-chips.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
In preparation to enabling -Wvla, remove VLAs and replace them
with fixed-length arrays instead.
>From a security viewpoint, the use of Variable Length Arrays can be
a vector for stack overflow attacks. Also, in general, as the code
evolves it is easy to lose track of how big a VLA can get. Thus, we
can end up having segfaults that are hard to debug.
Also, fixed as part of the directive to remove all VLAs from
the kernel: https://lkml.org/lkml/2018/3/7/621
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Reviewed-by: Krzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Move this enum to rtc-s5m.c once it is meaningless to others drivers [1].
[1] https://marc.info/?l=linux-rtc&m=152060068925948&w=2
Suggested-by: Krzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Reviewed-by: Krzysztof Kozlowski <krzk@kernel.org>
Acked-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
In preparation to enabling -Wvla, remove VLA and replace it
with a fixed-length array instead.
>From a security viewpoint, the use of Variable Length Arrays can be
a vector for stack overflow attacks. Also, in general, as the code
evolves it is easy to lose track of how big a VLA can get. Thus, we
can end up having segfaults that are hard to debug.
Also, fixed as part of the directive to remove all VLAs from
the kernel: https://lkml.org/lkml/2018/3/7/621
Signed-off-by: Gustavo A. R. Silva <garsilva@embeddedor.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
From our investigation for all RTC drivers, 1 driver will be expired before
year 2017, 7 drivers will be expired before year 2038, 23 drivers will be
expired before year 2069, 72 drivers will be expired before 2100 and 104
drivers will be expired before 2106. Especially for these early expired
drivers, we need to expand the RTC range to make the RTC can still work
after the expired year.
So we can expand the RTC range by adding one offset to the time when reading
from hardware, and subtracting it when writing back. For example, if you have
an RTC that can do 100 years, and currently is configured to be based in
Jan 1 1970, so it can represents times from 1970 to 2069. Then if you change
the start year from 1970 to 2000, which means it can represents times from
2000 to 2099. By adding or subtracting the offset produced by moving the wrap
point, all times between 1970 and 1999 from RTC hardware could get interpreted
as times from 2070 to 2099, but the interpretation of dates between 2000 and
2069 would not change.
Signed-off-by: Baolin Wang <baolin.wang@linaro.org>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
The RTC range validation code can be factored into rtc_valid_range()
function to avoid duplicate code.
Signed-off-by: Baolin Wang <baolin.wang@linaro.org>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Add a way for drivers to inform the core of the supported date/time range.
The core can then check whether the date/time or alarm is in the range
before calling ->set_time, ->set_mmss or ->set_alarm. It returns -ERANGE
when the time is out of range.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Fix possible race condition.
It is not allowed to return with an error code after RTC is registered.
Suggested-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Signed-off-by: Denis Osterland <Denis.Osterland@diehl.com>
Reviewed-by: Michael Grzeschik <m.grzeschik@pengutronix.de>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
The interrupt handler got enabled very early. If the interrupt cause is
triggering immediately before the context is fully prepared. This can
lead to undefined behaviour. Therefor we move the interrupt enable code
to the end of the probe function.
Signed-off-by: Michael Grzeschik <m.grzeschik@pengutronix.de>
Signed-off-by: Denis Osterland <Denis.Osterland@diehl.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Since accessing a Chrome OS EC based rtc is a slow operation, there is a
race window where if the alarm is set for the next second and the second
ticks over right before calculating the alarm offset.
In this case the current driver is setting a 0-second alarm, which would
be considered as disabling alarms by the EC(EC_RTC_ALARM_CLEAR).
This breaks, e.g., hwclock which relies on RTC_UIE_ON ->
rtc_update_irq_enable(), which sets a 1-second alarm and expects it to
fire an interrupt.
So return -ETIME when the alarm is in the past, follow __rtc_set_alarm().
Signed-off-by: Jeffy Chen <jeffy.chen@rock-chips.com>
Reviewed-by: Brian Norris <briannorris@chromium.org>
Tested-by: Brian Norris <briannorris@chromium.org>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
In order to set time in rtc, need to disable
rtc hw before writing into rtc registers.
Also fixes disabling of alarm while setting
rtc time.
Signed-off-by: Mohit Aggarwal <maggarwa@codeaurora.org>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
This config select's MFD_SYSCON, but does not depend on HAS_IOMEM.
Compile testing on architecture without HAS_IOMEM causes "unmet
direct dependencies" in Kconfig phase.
Detected by "make ARCH=score allyesconfig".
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
The probe function must not fail after rtc_register_device. Also, rename
the nvmem device so it is easily identifiable in /sys/bus/nvmem.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
The ISL12026 is a combination RTC and EEPROM device with I2C
interface. The standard RTC driver interface is provided. The EEPROM
is accessed via the NVMEM interface.
Reviewed-by: Rob Herring <robh@kernel.org>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: David Daney <david.daney@cavium.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
The HW default is one tick per second, however instead of assuming this,
lets make sure the waketimer is actually one tick per second before
arming the alarm.
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Justin Chen <justinpopo6@gmail.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
The current correction for leap years will fail in 3477. 3476-12-31 being
3477-01-00 because this is 366 leap years after 1970 and 3477 isn't a leap
year.
Fix that by looping over until days is positive or zero.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
This patch fixes a bug, that prevents the Allwinner A83T and the A80
from a successful boot.
The bug is there since v4.16-rc1 and appeared after the clk branch was
merged.
You can find the shortend trace below:
Unable to handle kernel NULL pointer dereference at virtual address
00000000
pgd = (ptrval)
[00000000] *pgd=00000000
Internal error: Oops: 5 [#1] SMP ARM
Modules linked in:
CPU: 0 PID: 49 Comm: kworker/0:1 Not tainted 4.15.0-10190-gb89e32ccd1be #2
Hardware name: Allwinner sun8i Family
Workqueue: events deferred_probe_work_func
PC is at clk_hw_get_rate+0x0/0x34
LR is at ac100_clkout_determine_rate+0x48/0x19c
[ ... ]
(clk_hw_get_rate) from (ac100_clkout_determine_rate+0x48/0x19c)
(ac100_clkout_determine_rate) from (clk_core_set_rate_nolock+0x3c/0x1a0)
(clk_core_set_rate_nolock) from (clk_set_rate+0x30/0x88)
(clk_set_rate) from (of_clk_set_defaults+0x200/0x364)
(of_clk_set_defaults) from (platform_drv_probe+0x18/0xb0)
To fix that bug, we first check if the return of the
clk_hw_get_parent_by_index is non zero. If it is zero we skip that
clock parent.
The BUG report could be found here: https://lkml.org/lkml/2018/2/10/198
Fixes: 04940631b8 ("rtc: ac100: Add clk output support")
Signed-off-by: Philipp Rossak <embed3d@gmail.com>
Acked-by: Maxime Ripard <maxime.ripard@bootlin.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
As per 8.2.6 Setting and reading the time in RTC mode, first stop the clok,
then reset it before setting the date and time registers. Finally, start
the clock.
This uses register address wrap around from 0x2f to 0x00 for efficiency.
This allows to set the clock with a millisecond accuracy (drift is not
corrected in this example):
RTC System
1325388767 1325388767.000029180
1325388768 1325388768.000018362
1325388769 1325388769.000006544
1325388770 1325388769.999992725
1325388771 1325388770.999974544
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
m41t80_get_datetime and m41t80_set_datetime are only used after casting dev
to an i2c_client. Remove that useless indirection.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Without CONFIG_RTC_DRV_M41T80_WDT the compiler complains:
|drivers/rtc/rtc-m41t80.c:76 ‘m41t80_rtc_mutex’ defined but not used [-Wunused-variable]
Move the variable to the block where it is used.
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
pcf85063_get_datetime and pcf85063_set_datetime are only used after casting
dev to an i2c_client. Remove that useless indirection.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
The RTC core is always calling rtc_valid_tm after the read_time callback.
It is not necessary to call it before returning from the callback.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
max6900_i2c_read_time and max6900_i2c_set_time are only used after casting
dev to an i2c_client. Remove that useless indirection.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
The RTC core is always calling rtc_valid_tm after the read_time callback.
It is not necessary to call it before returning from the callback.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
rs5c372_get_datetime and rs5c372_set_datetime are only used after casting
dev to an i2c_client. Remove that useless indirection.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
The RTC core is always calling rtc_valid_tm after the read_time callback.
It is not necessary to call it before returning from the callback.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
It is not necessary to print a message when the time is invalid as
userspace will already get an error (and an optional dev_dbg message).
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
s35390a_set_datetime, s35390a_get_datetime, s35390a_set_alarm and
s35390a_read_alarm are only used after casting dev to an i2c_client. Remove
that useless indirection.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
The RTC core is always calling rtc_valid_tm after the read_time callback.
It is not necessary to call it before returning from the callback.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
It is not necessary to print a message when the time is invalid as
userspace will already get an error (and an optional dev_dbg message).
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
The probe function is not allowed to fail after registering the RTC because
the following may happen:
CPU0: CPU1:
sys_load_module()
do_init_module()
do_one_initcall()
cmos_do_probe()
rtc_device_register()
__register_chrdev()
cdev->owner = struct module*
open("/dev/rtc0")
rtc_device_unregister()
module_put()
free_module()
module_free(mod->module_core)
/* struct module *module is now
freed */
chrdev_open()
spin_lock(cdev_lock)
cdev_get()
try_module_get()
module_is_live()
/* dereferences already
freed struct module* */
Switch to devm_rtc_allocate_device/rtc_register_device to register the rtc
as late as possible.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
At probe time, printing a message when the time is invalid doesn't have
much value. Also, as the comment suggest, this is a leftover from
development wherhe this was used to set the RTc to a default time.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
It is not necessary to print a message when the time is invalid as
userspace will already get an error (and an optional dev_dbg message).
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
It is not necessary to print a message when the time is invalid as
userspace will already get an error (and an optional dev_dbg message).
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
It is not necessary to print a message when the time is invalid as
userspace will already get an error (and an optional dev_dbg message).
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
It is not necessary to print a message when the time is invalid as
userspace will already get an error (and an optional dev_dbg message).
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
The RTC core is always validating the rtc_time struct before calling
.set_time. It is not necessary to do it again in .set_time.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
The RTC core is always validating the rtc_time struct before calling
.set_time or .set_alarm. It is not necessary to do it again.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
The RTC core is always validating the rtc_time struct before calling
.set_time or .set_alarm. It is not necessary to do it again.
Also, rtc_time_to_tm never generates an invalid rtc_tm (it can be out of
range though).
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
The RTC core is always calling rtc_valid_tm after the read_time callback.
It is not necessary to call it just before returning from the callback.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
The RTC core is always calling rtc_valid_tm after the read_time callback.
It is not necessary to call it just before returning from the callback.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
isl12022_get_datetime and isl12022_set_datetime are only used after casting
dev to an i2c_client. Remove that useless indirection.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
rtc_time64_to_tm never generates an invalid tm. It is not necessary to
validate it. Also, the RTC core is always calling rtc_valid_tm after the
read_time callback.
Reviewed-by: Baolin Wang <baolin.wang@linaro.org>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
The RTC core is always calling rtc_valid_tm after the read_time callback.
It is not necessary to call it just before returning from the callback.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
The RTC core is always calling rtc_valid_tm after the read_time callback.
It is not necessary to call it before returning from the callback.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
The RTC core is always calling rtc_valid_tm after the read_time callback.
It is not necessary to call it before returning from the callback.
Acked-by: Steve Twiss <stwiss.opensource@diasemi.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
The RTC core is always calling rtc_valid_tm after the read_time callback.
It is not necessary to call it just before returning from the callback.
Reviewed-by: Sebastian Reichel <sebastian.reichel@collabora.co.uk>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
The RTC core is always calling rtc_valid_tm after the read_time callback.
It is not necessary to call it just before returning from the callback.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
The RTC core is always calling rtc_valid_tm after the read_time callback.
It is not necessary to call it just before returning from the callback.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Returning a valid time when the time is invalid is a bad practice, because
then userspace is not able to react on the information. Also, it doesn't
make sense to return epoch because it is already the default time.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Returning a valid time when the time is invalid is a bad practice, because
then userspace is not able to react on the information. Also, it doesn't
make sense to return epoch because it is already the default time.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Setting the rtc to a valid time when the time is invalid is a bad practice,
because then userspace doesn't know it shouldn't trust the RTC.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Returning a valid time when the time is invalid is a bad practice, because
then userspace is not able to react on the information. Also, it doesn't
make sense to return epoch because it is already the default time.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Returning a valid time when the time is invalid is a bad practice, because
then userspace is not able to react on the information. Also, it doesn't
make sense to return epoch because it is already the default time.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
The shifting of buf[5] by 24 bits to the left will be promoted to
a 32 bit signed int and then sign-extended to an unsigned long. If
the top bit of buf[5] is set then all then all the upper bits sec
end up as also being set because of the sign-extension. Fix this by
casting buf[5] to an unsigned long before the shift.
Detected by CoverityScan, CID#1465292 ("Unintended sign extension")
Fixes: 0e1492330c ("rtc: add rtc-tx4939 driver")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
After successful
sr = isl1208_i2c_set_regs(client, 0, regs, ISL1208_RTC_SECTION_LEN);
sr will be 0.
As a result
sr = i2c_smbus_write_byte_data(client, ISL1208_REG_SR,
sr & ~ISL1208_REG_SR_WRTC);
is equal to
sr = i2c_smbus_write_byte_data(client, ISL1208_REG_SR, 0);
which clears all flags in SR.
Add an additional read of SR, to have value of SR in sr again.
Signed-off-by: Denis Osterland <Denis.Osterland@diehl.com>
Signed-off-by: Michael Grzeschik <m.grzeschik@pengutronix.de>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Instead of adding a binary sysfs attribute from the driver, use the core to
register an nvmem device.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
The probe function is not allowed to fail after registering the RTC. Call
rtc_register_device() at the end.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
The rtc-tx4939 driver now compiles correctly on other architectures, add
COMPILE_TEST to improve code coverage.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Copy RTC definitions from arch/mips/include/asm/txx9/tx4939.h to the RTC
driver so it doesn't depend on arch/mips anymore.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Instead of adding a binary sysfs attribute from the driver, use the core to
register an nvmem device.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
The probe function is not allowed to fail after registering the RTC. Call
rtc_register_device() at the end.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Currently, the IRQs are disabled when the rtc driver is removed (e.g. when
shutting down the platform).
This means that the RTC will be unable to wakeup the platform.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Instead of adding a binary sysfs attribute from the driver, use the core to
register an nvmem device.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
The probe function is not allowed to fail after registering the RTC because
the following may happen:
CPU0: CPU1:
sys_load_module()
do_init_module()
do_one_initcall()
cmos_do_probe()
rtc_device_register()
__register_chrdev()
cdev->owner = struct module*
open("/dev/rtc0")
rtc_device_unregister()
module_put()
free_module()
module_free(mod->module_core)
/* struct module *module is now
freed */
chrdev_open()
spin_lock(cdev_lock)
cdev_get()
try_module_get()
module_is_live()
/* dereferences already
freed struct module* */
Switch to devm_rtc_allocate_device/rtc_register_device to register the rtc
as late as possible.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Instead of adding a binary sysfs attribute from the driver (which suffers
from a race condition as the attribute appears after the device), use the
core to register an nvmem device.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Instead of adding a binary sysfs attribute from the driver, use the
core to register an nvmem device. This allows to use the in-kernel
interface to access the nvram.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
The probe function is not allowed to fail after registering the RTC because
the following may happen:
CPU0: CPU1:
sys_load_module()
do_init_module()
do_one_initcall()
cmos_do_probe()
rtc_device_register()
__register_chrdev()
cdev->owner = struct module*
open("/dev/rtc0")
rtc_device_unregister()
module_put()
free_module()
module_free(mod->module_core)
/* struct module *module is now
freed */
chrdev_open()
spin_lock(cdev_lock)
cdev_get()
try_module_get()
module_is_live()
/* dereferences already
freed struct module* */
Switch to devm_rtc_allocate_device/rtc_register_device to register the rtc
as late as possible.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Currently, the IRQs are disabled when the rtc driver is removed (e.g. when
shutting down the platform).
This means that the RTC will be unable to wakeup the platform.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Instead of adding a binary sysfs attribute from the driver (which suffers
from a race condition as the attribute appears after the device), use the
core to register an nvmem device.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Instead of adding a binary sysfs attribute from the driver (which suffers
from a race condition as the attribute appears after the device), use the
core to register an nvmem device.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Instead of adding a binary sysfs attribute from the driver (which suffers
from a race condition as the attribute appears after the device), use the
core to register an nvmem device.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
A documented ABI already exists to get information about the alarm. It is
the only one that is used.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Because nvmem_config is only used and copied at nvmem registration, remove
it from struct rtc_device.
All the rtc drivers using nvmem are now calling rtc_nvmem_register
directly.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
The probe function is not allowed to fail after registering the RTC. Call
rtc_register_device() at the end.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Call rtc_nvmem_register instead of letting the core do it and stop using
the nvmem_config member of struct rtc_device.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Call rtc_nvmem_register instead of letting the core do it and stop using
the nvmem_config member of struct rtc_device.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Call rtc_nvmem_register instead of letting the core do it and stop using
the nvmem_config member of struct rtc_device.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Move m48t86_nvmem_cfg to the stack of m48t86_rtc_probe. This results in a
very small code size reduction and make it safer on systems with two
similar RTCs:
text data bss dec hex filename
1733 164 0 1897 769 drivers/rtc/rtc-m48t86.o.before
1793 100 0 1893 765 drivers/rtc/rtc-m48t86.o.after
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Call rtc_nvmem_register instead of letting the core do it and stop using
the nvmem_config member of struct rtc_device.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Move ds1511_nvmem_cfg to the stack of ds1511_rtc_probe. This results in a
very small code size reduction and make it safer on systems with two
similar RTCs:
text data bss dec hex filename
2128 164 4 2296 8f8 drivers/rtc/rtc-ds1511.o.before
2175 100 4 2279 8e7 drivers/rtc/rtc-ds1511.o.after
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Call rtc_nvmem_register instead of letting the core do it and stop using
the nvmem_config member of struct rtc_device.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Avoid allocating memory for struct nvmem_config as it is only necessary at
the nvmem registration.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Call rtc_nvmem_register instead of letting the core do it and stop using
the nvmem_config member of struct rtc_device.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Call rtc_nvmem_register instead of letting the core do it and stop using
the nvmem_config member of struct rtc_device.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Export rtc_nvmem_register() so it can be called from drivers instead of
only the core.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Switch the parent of the nvmem device to the parent of the rtc device so it
can be registered before the RTC.
This is a small change in the ABI as the nvmem moves out of the
/sys/class/rtc/rtcX folder to be under the parent device folder (that is
where the previous nvram files where registered).
However, it is still available under its correct location,
/sys/bus/nvmem/devices which is the one that should be used by userspace
applications.
The other benefit is that the nvmem device can stay registered even if the
rtc registration fails. Or it is possible to not register the rtc if the
nvmem registration failed.
Finally, it makes a lot of sense for devices that actually have different
i2c or spi addresses for the RTC and the EEPROM. That is basically how it
would end up when using MFD or even completely separate devices.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Make rtc_nvmem_register return -EBUSY when an nvmem is already registered
for that RTC.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
In case of error, make rtc_nvmem_register() able to return an error value
to its caller.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
To be able to remove nvmem_config from struct rtc_device, pass it as a
parameter to rtc_nvmem_register.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Pointe bp is being initialized and this value is never read, it
is being updated to the same value later just before it is going to
be used. Remove the initialization as it is never read and keep
the setting of bp closer to the use of bp.
Cleans up clang warnings:
drivers/rtc/rtc-ds1302.c:115:7: warning: Value stored to 'bp' during
its initialization is never read
drivers/rtc/rtc-ds1302.c:46:7: warning: Value stored to 'bp' during
its initialization is never read
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Fix the following warning in MIPS allmodconfig by adding a
MODULE_LICENSE() at the end of rtc-goldfish.c, based on the file header
comment which says GNU General Public License version 2:
WARNING: modpost: missing MODULE_LICENSE() in drivers/rtc/rtc-goldfish.o
Fixes: f22d9cdcb5 ("rtc: goldfish: Add RTC driver for Android emulator")
Signed-off-by: James Hogan <jhogan@kernel.org>
Cc: Miodrag Dinic <miodrag.dinic@mips.com>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Cc: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Cc: linux-rtc@vger.kernel.org
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
If we convert one large time values to rtc_time, in the original formula
'days * 86400' can be overflowed in 'unsigned int' type to make the formula
get one incorrect remain seconds value. Thus we can use div_s64_rem()
function to avoid this situation.
Signed-off-by: Baolin Wang <baolin.wang@linaro.org>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
It will be more helpful to add some tracepoints to track RTC actions when
debugging RTC driver. Below sample is that we set/read the RTC time, then
set 2 alarms, so we can see the trace logs:
set/read RTC time:
kworker/0:1-67 [000] 21.814245: rtc_set_time: UTC (1510301580) (0)
kworker/0:1-67 [000] 21.814312: rtc_read_time: UTC (1510301580) (0)
set the first alarm timer:
kworker/0:1-67 [000] 21.829238: rtc_timer_enqueue: RTC timer:(ffffffc15eb49bc8) expires:1510301700000000000 period:0
kworker/0:1-67 [000] 22.018279: rtc_set_alarm: UTC (1510301700) (0)
set the second alarm timer:
kworker/0:1-67 [000] 22.230284: rtc_timer_enqueue: RTC timer:(ffffff80088e6430) expires:1510301820000000000 period:0
the first alarm timer was expired:
kworker/0:1-67 [000] 145.155584: rtc_timer_dequeue: RTC timer:(ffffffc15eb49bc8) expires:1510301700000000000 period:0
kworker/0:1-67 [000] 145.155593: rtc_timer_fired: RTC timer:(ffffffc15eb49bc8) expires:1510301700000000000 period:0
kworker/0:1-67 [000] 145.172504: rtc_set_alarm: UTC (1510301820) (0)
the second alarm timer was expired:
kworker/0:1-67 [000] 269.102353: rtc_timer_dequeue: RTC timer:(ffffff80088e6430) expires:1510301820000000000 period:0
kworker/0:1-67 [000] 269.102360: rtc_timer_fired: RTC timer:(ffffff80088e6430) expires:1510301820000000000 period:0
disable alarm irq:
kworker/0:1-67 [000] 269.102469: rtc_alarm_irq_enable: disable RTC alarm IRQ (0)
Signed-off-by: Baolin Wang <baolin.wang@linaro.org>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
This is the mindless scripted replacement of kernel use of POLL*
variables as described by Al, done by this script:
for V in IN OUT PRI ERR RDNORM RDBAND WRNORM WRBAND HUP RDHUP NVAL MSG; do
L=`git grep -l -w POLL$V | grep -v '^t' | grep -v /um/ | grep -v '^sa' | grep -v '/poll.h$'|grep -v '^D'`
for f in $L; do sed -i "-es/^\([^\"]*\)\(\<POLL$V\>\)/\\1E\\2/" $f; done
done
with de-mangling cleanups yet to come.
NOTE! On almost all architectures, the EPOLL* constants have the same
values as the POLL* constants do. But they keyword here is "almost".
For various bad reasons they aren't the same, and epoll() doesn't
actually work quite correctly in some cases due to this on Sparc et al.
The next patch from Al will sort out the final differences, and we
should be all done.
Scripted-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Highlights:
- Enable support for memory protection keys aka "pkeys" on Power7/8/9 when
using the hash table MMU.
- Extend our interrupt soft masking to support masking PMU interrupts as well
as "normal" interrupts, and then use that to implement local_t for a ~4x
speedup vs the current atomics-based implementation.
- A new driver "ocxl" for "Open Coherent Accelerator Processor Interface
(OpenCAPI)" devices.
- Support for new device tree properties on PowerVM to describe hotpluggable
memory and devices.
- Add support for CLOCK_{REALTIME/MONOTONIC}_COARSE to the 64-bit VDSO.
- Freescale updates from Scott:
"Contains fixes for CPM GPIO and an FSL PCI erratum workaround, plus a
minor cleanup patch."
As well as quite a lot of other changes all over the place, and small fixes and
cleanups as always.
Thanks to:
Alan Modra, Alastair D'Silva, Alexey Kardashevskiy, Alistair Popple, Andreas
Schwab, Andrew Donnellan, Aneesh Kumar K.V, Anju T Sudhakar, Anshuman
Khandual, Anton Blanchard, Arnd Bergmann, Balbir Singh, Benjamin
Herrenschmidt, Bhaktipriya Shridhar, Bryant G. Ly, Cédric Le Goater,
Christophe Leroy, Christophe Lombard, Cyril Bur, David Gibson, Desnes A. Nunes
do Rosario, Dmitry Torokhov, Frederic Barrat, Geert Uytterhoeven, Guilherme G.
Piccoli, Gustavo A. R. Silva, Gustavo Romero, Ivan Mikhaylov, Joakim
Tjernlund, Joe Perches, Josh Poimboeuf, Juan J. Alvarez, Julia Cartwright,
Kamalesh Babulal, Madhavan Srinivasan, Mahesh Salgaonkar, Mathieu Malaterre,
Michael Bringmann, Michael Hanselmann, Michael Neuling, Nathan Fontenot,
Naveen N. Rao, Nicholas Piggin, Paul Mackerras, Philippe Bergheaud, Ram Pai,
Russell Currey, Santosh Sivaraj, Scott Wood, Seth Forshee, Simon Guo, Stewart
Smith, Sukadev Bhattiprolu, Thiago Jung Bauermann, Vaibhav Jain, Vasyl
Gomonovych.
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Merge tag 'powerpc-4.16-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux
Pull powerpc updates from Michael Ellerman:
"Highlights:
- Enable support for memory protection keys aka "pkeys" on Power7/8/9
when using the hash table MMU.
- Extend our interrupt soft masking to support masking PMU interrupts
as well as "normal" interrupts, and then use that to implement
local_t for a ~4x speedup vs the current atomics-based
implementation.
- A new driver "ocxl" for "Open Coherent Accelerator Processor
Interface (OpenCAPI)" devices.
- Support for new device tree properties on PowerVM to describe
hotpluggable memory and devices.
- Add support for CLOCK_{REALTIME/MONOTONIC}_COARSE to the 64-bit
VDSO.
- Freescale updates from Scott: fixes for CPM GPIO and an FSL PCI
erratum workaround, plus a minor cleanup patch.
As well as quite a lot of other changes all over the place, and small
fixes and cleanups as always.
Thanks to: Alan Modra, Alastair D'Silva, Alexey Kardashevskiy,
Alistair Popple, Andreas Schwab, Andrew Donnellan, Aneesh Kumar K.V,
Anju T Sudhakar, Anshuman Khandual, Anton Blanchard, Arnd Bergmann,
Balbir Singh, Benjamin Herrenschmidt, Bhaktipriya Shridhar, Bryant G.
Ly, Cédric Le Goater, Christophe Leroy, Christophe Lombard, Cyril Bur,
David Gibson, Desnes A. Nunes do Rosario, Dmitry Torokhov, Frederic
Barrat, Geert Uytterhoeven, Guilherme G. Piccoli, Gustavo A. R. Silva,
Gustavo Romero, Ivan Mikhaylov, Joakim Tjernlund, Joe Perches, Josh
Poimboeuf, Juan J. Alvarez, Julia Cartwright, Kamalesh Babulal,
Madhavan Srinivasan, Mahesh Salgaonkar, Mathieu Malaterre, Michael
Bringmann, Michael Hanselmann, Michael Neuling, Nathan Fontenot,
Naveen N. Rao, Nicholas Piggin, Paul Mackerras, Philippe Bergheaud,
Ram Pai, Russell Currey, Santosh Sivaraj, Scott Wood, Seth Forshee,
Simon Guo, Stewart Smith, Sukadev Bhattiprolu, Thiago Jung Bauermann,
Vaibhav Jain, Vasyl Gomonovych"
* tag 'powerpc-4.16-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux: (199 commits)
powerpc/mm/radix: Fix build error when RADIX_MMU=n
macintosh/ams-input: Use true and false for boolean values
macintosh: change some data types from int to bool
powerpc/watchdog: Print the NIP in soft_nmi_interrupt()
powerpc/watchdog: regs can't be null in soft_nmi_interrupt()
powerpc/watchdog: Tweak watchdog printks
powerpc/cell: Remove axonram driver
rtc-opal: Fix handling of firmware error codes, prevent busy loops
powerpc/mpc52xx_gpt: make use of raw_spinlock variants
macintosh/adb: Properly mark continued kernel messages
powerpc/pseries: Fix cpu hotplug crash with memoryless nodes
powerpc/numa: Ensure nodes initialized for hotplug
powerpc/numa: Use ibm,max-associativity-domains to discover possible nodes
powerpc/kernel: Block interrupts when updating TIDR
powerpc/powernv/idoa: Remove unnecessary pcidev from pci_dn
powerpc/mm/nohash: do not flush the entire mm when range is a single page
powerpc/pseries: Add Initialization of VF Bars
powerpc/pseries/pci: Associate PEs to VFs in configure SR-IOV
powerpc/eeh: Add EEH notify resume sysfs
powerpc/eeh: Add EEH operations to notify resume
...
to the clk rate protection support added by Jerome Brunet. This feature
will allow consumers to lock in a certain rate on the output of a clk so
that things like audio playback don't hear pops when the clk frequency
changes due to shared parent clks changing rates. Currently the clk
API doesn't guarantee the rate of a clk stays at the rate you request
after clk_set_rate() is called, so this new API will allow drivers
to express that requirement. Beyond this, the core got some debugfs
pretty printing patches and a couple minor non-critical fixes.
Looking outside of the core framework diff we have some new driver
additions and the removal of a legacy TI clk driver. Both of these hit
high in the dirstat. Also, the removal of the asm-generic/clkdev.h file
causes small one-liners in all the architecture Kbuild files. Overall, the
driver diff seems to be the normal stuff that comes all the time to
fix little problems here and there and to support new hardware.
Core:
- Clk rate protection
- Symbolic clk flags in debugfs output
- Clk registration enabled clks while doing bookkeeping updates
New Drivers:
- Spreadtrum SC9860
- HiSilicon hi3660 stub
- Qualcomm A53 PLL, SPMI clkdiv, and MSM8916 APCS
- Amlogic Meson-AXG
- ASPEED BMC
Removed Drivers:
- TI OMAP 3xxx legacy clk (non-DT) support
- asm*/clkdev.h got removed (not really a driver)
Updates:
- Renesas FDP1-0 module clock on R-Car M3-W
- Renesas LVDS module clock on R-Car V3M
- Misc fixes to pr_err() prints
- Qualcomm MSM8916 audio fixes
- Qualcomm IPQ8074 rounded out support for more peripherals
- Qualcomm Alpha PLL variants
- Divider code was using container_of() on bad pointers
- Allwinner DE2 clks on H3
- Amlogic minor data fixes and dropping of CLK_IGNORE_UNUSED
- Mediatek clk driver compile test support
- AT91 PMC clk suspend/resume restoration support
- PLL issues fixed on si5351
- Broadcom IProc PLL calculation updates
- DVFS support for Armada mvebu CPU clks
- Allwinner fixed post-divider support
- TI clkctrl fixes and support for newer SoCs
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Merge tag 'clk-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/clk/linux
Pull clk updates from Stephen Boyd:
"The core framework has a handful of patches this time around, mostly
due to the clk rate protection support added by Jerome Brunet.
This feature will allow consumers to lock in a certain rate on the
output of a clk so that things like audio playback don't hear pops
when the clk frequency changes due to shared parent clks changing
rates. Currently the clk API doesn't guarantee the rate of a clk stays
at the rate you request after clk_set_rate() is called, so this new
API will allow drivers to express that requirement.
Beyond this, the core got some debugfs pretty printing patches and a
couple minor non-critical fixes.
Looking outside of the core framework diff we have some new driver
additions and the removal of a legacy TI clk driver. Both of these hit
high in the dirstat. Also, the removal of the asm-generic/clkdev.h
file causes small one-liners in all the architecture Kbuild files.
Overall, the driver diff seems to be the normal stuff that comes all
the time to fix little problems here and there and to support new
hardware.
Summary:
Core:
- Clk rate protection
- Symbolic clk flags in debugfs output
- Clk registration enabled clks while doing bookkeeping updates
New Drivers:
- Spreadtrum SC9860
- HiSilicon hi3660 stub
- Qualcomm A53 PLL, SPMI clkdiv, and MSM8916 APCS
- Amlogic Meson-AXG
- ASPEED BMC
Removed Drivers:
- TI OMAP 3xxx legacy clk (non-DT) support
- asm*/clkdev.h got removed (not really a driver)
Updates:
- Renesas FDP1-0 module clock on R-Car M3-W
- Renesas LVDS module clock on R-Car V3M
- Misc fixes to pr_err() prints
- Qualcomm MSM8916 audio fixes
- Qualcomm IPQ8074 rounded out support for more peripherals
- Qualcomm Alpha PLL variants
- Divider code was using container_of() on bad pointers
- Allwinner DE2 clks on H3
- Amlogic minor data fixes and dropping of CLK_IGNORE_UNUSED
- Mediatek clk driver compile test support
- AT91 PMC clk suspend/resume restoration support
- PLL issues fixed on si5351
- Broadcom IProc PLL calculation updates
- DVFS support for Armada mvebu CPU clks
- Allwinner fixed post-divider support
- TI clkctrl fixes and support for newer SoCs"
* tag 'clk-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/clk/linux: (125 commits)
clk: aspeed: Handle inverse polarity of USB port 1 clock gate
clk: aspeed: Fix return value check in aspeed_cc_init()
clk: aspeed: Add reset controller
clk: aspeed: Register gated clocks
clk: aspeed: Add platform driver and register PLLs
clk: aspeed: Register core clocks
clk: Add clock driver for ASPEED BMC SoCs
clk: mediatek: adjust dependency of reset.c to avoid unexpectedly being built
clk: fix reentrancy of clk_enable() on UP systems
clk: meson-axg: fix potential NULL dereference in axg_clkc_probe()
clk: Simplify debugfs registration
clk: Fix debugfs_create_*() usage
clk: Show symbolic clock flags in debugfs
clk: renesas: r8a7796: Add FDP clock
clk: Move __clk_{get,put}() into private clk.h API
clk: sunxi: Use CLK_IS_CRITICAL flag for critical clks
clk: Improve flags doc for of_clk_detect_critical()
arch: Remove clkdev.h asm-generic from Kbuild
clk: sunxi-ng: a83t: Add M divider to TCON1 clock
clk: Prepare to remove asm-generic/clkdev.h
...
According to the OPAL docs:
skiboot-5.2.5/doc/opal-api/opal-rtc-read-3.txt
skiboot-5.2.5/doc/opal-api/opal-rtc-write-4.txt
OPAL_HARDWARE may be returned from OPAL_RTC_READ or OPAL_RTC_WRITE and
this indicates either a transient or permanent error.
Prior to this patch, Linux was not dealing with OPAL_HARDWARE being a
permanent error particularly well, in that you could end up in a busy
loop.
This was not too hard to trigger on an AMI BMC based OpenPOWER machine
doing a continuous "ipmitool mc reset cold" to the BMC, the result of
that being that we'd get stuck in an infinite loop in
opal_get_rtc_time().
We now retry a few times before returning the error higher up the
stack.
Fixes: 16b1d26e77 ("rtc/tpo: Driver to support rtc and wakeup on PowerNV platform")
Cc: stable@vger.kernel.org # v3.19+
Signed-off-by: Stewart Smith <stewart@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Since PLATFORM_AT32AP is an AVR32 platform which was removed, the
rtc driver rtc-at32ap700x is useless.
This patch remove it.
Signed-off-by: Corentin Labbe <clabbe.montjoie@gmail.com>
Acked-by: Hans-Christian Noren Egtvedt <egtvedt@samfundet.no>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
The mxc_rtc_remove is incorrectly annotated as __exit:
`mxc_rtc_remove' referenced in section `.data' of drivers/rtc/rtc-mxc_v2.o: defined in discarded section `.exit.text' of drivers/rtc/rtc-mxc_v2.o
This should not be done, as devices can be dynamically bound
and unbound to a driver.
Fixes: 54c47014b474 ("rtc: add mxc driver for i.MX53 SRTC")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
devm_ioremap_resource() already checks if the resource is NULL, so
remove the unnecessary platform_get_resource() error check.
Signed-off-by: Fabio Estevam <fabio.estevam@nxp.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Neither rtc-imxdi, rtc-mxc nor rtc-snvs are compatible with i.MX53.
This is driver enables support for the low power domain SRTC features:
- 32-bit MSB of non-rollover time counter
- 32-bit alarm register
Select the new config option RTC_DRV_MXC_V2 to build this driver
Based on:
http://git.freescale.com/git/cgit.cgi/imx/linux-2.6-imx.git/tree/drivers/rtc/rtc-mxc_v2.c?h=imx_2.6.35_11.09.01
Signed-off-by: Patrick Bruenn <p.bruenn@beckhoff.com>
Acked-by: Philippe Ombredanne <pombredanne@nexb.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
The driver may sleep under a spinlock.
The function call path is:
rtc7301_set_time (acquire the spinlock)
usleep_range --> may sleep
To fix it, usleep_range is replaced with udelay.
This bug is found by my static analysis tool(DSAC) and checked by my code review.
Signed-off-by: Jia-Ju Bai <baijiaju1990@gmail.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
The driver may sleep under a spinlock.
The function call path is:
rtc7301_read_time (acquire the spinlock)
rtc7301_wait_while_busy
usleep_range --> may sleep
To fix it, usleep_range is replaced with udelay.
This bug is found by my static analysis tool(DSAC) and checked by my code review.
Signed-off-by: Jia-Ju Bai <baijiaju1990@gmail.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
divider_recalc_rate() is an helper function used by clock divider of
different types, so the structure containing the 'hw' pointer is not
always a 'struct clk_divider'
At the following line:
> div = _get_div(table, val, flags, divider->width);
in several cases, the value of 'divider->width' is garbage as the actual
structure behind this memory is not a 'struct clk_divider'
Fortunately, this width value is used by _get_val() only when
CLK_DIVIDER_MAX_AT_ZERO flag is set. This has never been the case so
far when the structure is not a 'struct clk_divider'. This is probably
why we did not notice this bug before
Fixes: afe76c8fd0 ("clk: allow a clk divider with max divisor when zero")
Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
Acked-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Acked-by: Sylvain Lemieux <slemieux.tyco@gmail.com>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
There are 2 error paths after clk_prepare_enable() was called, where
clk_disable_unprepare() is missing.
Found by Linux Driver Verification project (linuxtesting.org).
Signed-off-by: Andreas Platschek <andreas.platschek@opentech.at>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
The error return path on clk_data allocation failure does not kfree
the allocated rtc object. Fix this with a kfree of rtc on the error
exit path.
Detected by CoverityScan, CID#1452264 ("Resource Leak")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
On platforms with a Chrome OS EC, the EC can function as a simple RTC.
Add a basic driver with this functionality.
Signed-off-by: Stephen Barber <smbarber@chromium.org>
Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
Acked-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Acked-by: Benson Leung <bleung@chromium.org>
Reviewed-by: Brian Norris <briannorris@chromium.org>
Tested-by: Brian Norris <briannorris@chromium.org>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
r9701_remove function is now empty, remove it.
Signed-off-by: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Pull timer updates from Thomas Gleixner:
- The final conversion of timer wheel timers to timer_setup().
A few manual conversions and a large coccinelle assisted sweep and
the removal of the old initialization mechanisms and the related
code.
- Remove the now unused VSYSCALL update code
- Fix permissions of /proc/timer_list. I still need to get rid of that
file completely
- Rename a misnomed clocksource function and remove a stale declaration
* 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (27 commits)
m68k/macboing: Fix missed timer callback assignment
treewide: Remove TIMER_FUNC_TYPE and TIMER_DATA_TYPE casts
timer: Remove redundant __setup_timer*() macros
timer: Pass function down to initialization routines
timer: Remove unused data arguments from macros
timer: Switch callback prototype to take struct timer_list * argument
timer: Pass timer_list pointer to callbacks unconditionally
Coccinelle: Remove setup_timer.cocci
timer: Remove setup_*timer() interface
timer: Remove init_timer() interface
treewide: setup_timer() -> timer_setup() (2 field)
treewide: setup_timer() -> timer_setup()
treewide: init_timer() -> setup_timer()
treewide: Switch DEFINE_TIMER callbacks to struct timer_list *
s390: cmm: Convert timers to use timer_setup()
lightnvm: Convert timers to use timer_setup()
drivers/net: cris: Convert timers to use timer_setup()
drm/vc4: Convert timers to use timer_setup()
block/laptop_mode: Convert timers to use timer_setup()
net/atm/mpc: Avoid open-coded assignment of timer callback function
...
Subsystem:
- Fix setting the alarm to the next expiring timer
New driver:
- Mediatek MT7622 RTC
- NXP PCF85363
- Spreadtrum SC27xx PMIC RTC
Drivers:
- Use generic nvmem to expose the Non volatile ram for ds1305, ds1511,
m48t86 and omap
- abx80x: solve possible race condition at probe
- armada38x: support trimming the RTC oscillator
- at91rm9200: fix reading the alarm value at boot
- ds1511: allow waking platform
- m41t80: rework square wave output
- pcf8523: support trimming the RTC oscillator
- pcf8563: fix clock output rate
- pl031: make interrupt optional
- xgene: fix suspend/resume
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Merge tag 'rtc-4.15' of git://git.kernel.org/pub/scm/linux/kernel/git/abelloni/linux
Pull RTC updates from Alexandre Belloni:
"There is nothing scary this cycle, mostly driver fixes and updates.
The core fix has been in for a while and has been tested on multiple
kernel revisions by multiple teams.
Core:
- Fix setting the alarm to the next expiring timer
New drivers:
- Mediatek MT7622 RTC
- NXP PCF85363
- Spreadtrum SC27xx PMIC RTC
Drivers updates:
- Use generic nvmem to expose the Non volatile ram for ds1305,
ds1511, m48t86 and omap
- abx80x: solve possible race condition at probe
- armada38x: support trimming the RTC oscillator
- at91rm9200: fix reading the alarm value at boot
- ds1511: allow waking platform
- m41t80: rework square wave output
- pcf8523: support trimming the RTC oscillator
- pcf8563: fix clock output rate
- pl031: make interrupt optional
- xgene: fix suspend/resume"
* tag 'rtc-4.15' of git://git.kernel.org/pub/scm/linux/kernel/git/abelloni/linux: (50 commits)
dt-bindings: rtc: imxdi: Improve the bindings text
rtc: sc27xx: Add Spreadtrum SC27xx PMIC RTC driver
dt-bindings: rtc: Add Spreadtrum SC27xx RTC documentation
rtc: at91rm9200: fix reading alarm value
rtc: at91rm9200: stop calculating yday in at91_rtc_readalarm
rtc: sysfs: Use time64_t variables to set time/alarm
rtc: xgene: mark PM functions as __maybe_unused
rtc: xgene: Fix suspend/resume
rtc: pcf8563: don't alway enable the alarm
rtc: pcf8563: fix output clock rate
rtc: rx8010: Fix for incorrect return value
rtc: rx8010: Specify correct address for RX8010_RESV31
rtc: rx8010: Remove duplicate define
rtc: m41t80: remove unneeded checks from m41t80_sqw_set_rate
rtc: m41t80: avoid i2c read in m41t80_sqw_is_prepared
rtc: m41t80: avoid i2c read in m41t80_sqw_recalc_rate
rtc: m41t80: fix m41t80_sqw_round_rate return value
rtc: m41t80: m41t80_sqw_set_rate should return 0 on success
rtc: add support for NXP PCF85363 real-time clock
rtc: omap: Support scratch registers
...
This patch adds the Spreadtrum RTC driver, which embedded in the
Spreadtrum SC27xx series PMICs.
Signed-off-by: Baolin Wang <baolin.wang@spreadtrum.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Pull timer updates from Thomas Gleixner:
"Yet another big pile of changes:
- More year 2038 work from Arnd slowly reaching the point where we
need to think about the syscalls themself.
- A new timer function which allows to conditionally (re)arm a timer
only when it's either not running or the new expiry time is sooner
than the armed expiry time. This allows to use a single timer for
multiple timeout requirements w/o caring about the first expiry
time at the call site.
- A new NMI safe accessor to clock real time for the printk timestamp
work. Can be used by tracing, perf as well if required.
- A large number of timer setup conversions from Kees which got
collected here because either maintainers requested so or they
simply got ignored. As Kees pointed out already there are a few
trivial merge conflicts and some redundant commits which was
unavoidable due to the size of this conversion effort.
- Avoid a redundant iteration in the timer wheel softirq processing.
- Provide a mechanism to treat RTC implementations depending on their
hardware properties, i.e. don't inflict the write at the 0.5
seconds boundary which originates from the PC CMOS RTC to all RTCs.
No functional change as drivers need to be updated separately.
- The usual small updates to core code clocksource drivers. Nothing
really exciting"
* 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (111 commits)
timers: Add a function to start/reduce a timer
pstore: Use ktime_get_real_fast_ns() instead of __getnstimeofday()
timer: Prepare to change all DEFINE_TIMER() callbacks
netfilter: ipvs: Convert timers to use timer_setup()
scsi: qla2xxx: Convert timers to use timer_setup()
block/aoe: discover_timer: Convert timers to use timer_setup()
ide: Convert timers to use timer_setup()
drbd: Convert timers to use timer_setup()
mailbox: Convert timers to use timer_setup()
crypto: Convert timers to use timer_setup()
drivers/pcmcia: omap1: Fix error in automated timer conversion
ARM: footbridge: Fix typo in timer conversion
drivers/sgi-xp: Convert timers to use timer_setup()
drivers/pcmcia: Convert timers to use timer_setup()
drivers/memstick: Convert timers to use timer_setup()
drivers/macintosh: Convert timers to use timer_setup()
hwrng/xgene-rng: Convert timers to use timer_setup()
auxdisplay: Convert timers to use timer_setup()
sparc/led: Convert timers to use timer_setup()
mips: ip22/32: Convert timers to use timer_setup()
...
When alarm value is read at boot time, at91_alarm_year is not yet set to
the proper value so the year is always set to 1900.
This results in that kind of message at boot:
rtc rtc0: invalid alarm value: 1900-1-14 2:11:39
There is no way to recover from that as the alarm is now only read when
booting.
Instead, rely on the rtc core to figure out the proper year.
Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Calculating yday in the read_alarm callback is useless as this value is
never used later. Also, it was buggy anyway because at the time this is
done, tm_year is always 0 as the alarm register doesn't hold the year.
Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Use time64_t variables and related APIs for sysfs interfaces to
support setting time or alarm after the year 2038 on 32-bit system.
Signed-off-by: Baolin Wang <baolin.wang@linaro.org>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
The new xgene_rtc_alarm_irq_enabled() function is only accessed
from PM code, which is inside of an #ifdef; this causes a harmless
build warning when CONFIG_PM is disabled:
drivers/rtc/rtc-xgene.c:108:12: error: 'xgene_rtc_alarm_irq_enabled' defined but not used [-Werror=unused-function]
Just remove the #ifdef and use __maybe_unused annotations instead,
to make the code more robust here.
Fixes: d0bcd82b13 ("rtc: xgene: Fix suspend/resume")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Loc Ho <lho@apm.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
This patch fixes suspend/resume functions properly for the APM X-Gene
SoC RTC driver.
Signed-off-by: Loc Ho <lho@apm.com>
Reviewed-by: Mark Brown <broonie@linaro.org>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Allow setting the alarm and later enable it instead of enabling it
unconditionally.
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
The pcf8563_clkout_recalc_rate function erroneously ignores the
frequency index read from the CLKO register and always returns
32768 Hz.
Fixes: a39a6405d5 ("rtc: pcf8563: add CLKOUT to common clock framework")
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
The err variable is not being reset after a successful read. Explicitly
return 0 at the end of function call to account for all return paths.
Reported-by: Jens-Peter Oswald <oswald@lre.de>
Signed-off-by: Akshay Bhat <akshay.bhat@timesys.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
m41t80_sqw_set_rate will be called with the result from
m41t80_sqw_round_rate, so might as well make
m41t80_sqw_set_rate(n) same as
m41t80_sqw_set_rate(m41t80_sqw_round_rate(n))
As Russell King wrote[1],
"clk_round_rate() is supposed to tell you what you end up with if you
ask clk_set_rate() to set the exact same value you passed in - but
clk_round_rate() won't modify the hardware."
[1]
http://lists.infradead.org/pipermail/linux-arm-kernel/2012-January/080175.html
Signed-off-by: Troy Kisky <troy.kisky@boundarydevices.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
This is a little more efficient and avoids the warning
WARNING: possible circular locking dependency detected
4.14.0-rc7-00010 #16 Not tainted
------------------------------------------------------
kworker/2:1/70 is trying to acquire lock:
(prepare_lock){+.+.}, at: [<c049300c>] clk_prepare_lock+0x80/0xf4
but task is already holding lock:
(i2c_register_adapter){+.+.}, at: [<c0690b04>]
i2c_adapter_lock_bus+0x14/0x18
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #1 (i2c_register_adapter){+.+.}:
rt_mutex_lock+0x44/0x5c
i2c_adapter_lock_bus+0x14/0x18
i2c_transfer+0xa8/0xbc
i2c_smbus_xfer+0x20c/0x5d8
i2c_smbus_read_byte_data+0x38/0x48
m41t80_sqw_is_prepared+0x18/0x28
Signed-off-by: Troy Kisky <troy.kisky@boundarydevices.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
This is a little more efficient, and avoids the warning
WARNING: possible circular locking dependency detected
4.14.0-rc7-00007 #14 Not tainted
------------------------------------------------------
alsactl/330 is trying to acquire lock:
(prepare_lock){+.+.}, at: [<c049300c>] clk_prepare_lock+0x80/0xf4
but task is already holding lock:
(i2c_register_adapter){+.+.}, at: [<c0690ae0>]
i2c_adapter_lock_bus+0x14/0x18
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #1 (i2c_register_adapter){+.+.}:
rt_mutex_lock+0x44/0x5c
i2c_adapter_lock_bus+0x14/0x18
i2c_transfer+0xa8/0xbc
i2c_smbus_xfer+0x20c/0x5d8
i2c_smbus_read_byte_data+0x38/0x48
m41t80_sqw_recalc_rate+0x24/0x58
Signed-off-by: Troy Kisky <troy.kisky@boundarydevices.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Previously it was returning -EINVAL upon success.
Signed-off-by: Troy Kisky <troy.kisky@boundarydevices.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Note that alarms are not currently implemented.
64 bytes of nvmem is supported and exposed in
sysfs (# is the instance number, starting with 0):
/sys/bus/nvmem/devices/pcf85363-#/nvmem
Signed-off-by: Eric Nelson <eric@nelint.com>
Reviewed-by: Fabio Estevam <fabio.estevam@nxp.com>
Tested-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Register an nvmem device to expose the 3 scratch registers (total of 12
bytes) to both userspace and kernel space.
Reviewed-by: Sekhar Nori <nsekhar@ti.com>
Tested-by: Keerthy <j-keerthy@ti.com>
Reviewed-by: Keerthy <j-keerthy@ti.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Many source files in the tree are missing licensing information, which
makes it harder for compliance tools to determine the correct license.
By default all files without license information are under the default
license of the kernel, which is GPL version 2.
Update the files which contain no license information with the 'GPL-2.0'
SPDX license identifier. The SPDX identifier is a legally binding
shorthand, which can be used instead of the full boiler plate text.
This patch is based on work done by Thomas Gleixner and Kate Stewart and
Philippe Ombredanne.
How this work was done:
Patches were generated and checked against linux-4.14-rc6 for a subset of
the use cases:
- file had no licensing information it it.
- file was a */uapi/* one with no licensing information in it,
- file was a */uapi/* one with existing licensing information,
Further patches will be generated in subsequent months to fix up cases
where non-standard license headers were used, and references to license
had to be inferred by heuristics based on keywords.
The analysis to determine which SPDX License Identifier to be applied to
a file was done in a spreadsheet of side by side results from of the
output of two independent scanners (ScanCode & Windriver) producing SPDX
tag:value files created by Philippe Ombredanne. Philippe prepared the
base worksheet, and did an initial spot review of a few 1000 files.
The 4.13 kernel was the starting point of the analysis with 60,537 files
assessed. Kate Stewart did a file by file comparison of the scanner
results in the spreadsheet to determine which SPDX license identifier(s)
to be applied to the file. She confirmed any determination that was not
immediately clear with lawyers working with the Linux Foundation.
Criteria used to select files for SPDX license identifier tagging was:
- Files considered eligible had to be source code files.
- Make and config files were included as candidates if they contained >5
lines of source
- File already had some variant of a license header in it (even if <5
lines).
All documentation files were explicitly excluded.
The following heuristics were used to determine which SPDX license
identifiers to apply.
- when both scanners couldn't find any license traces, file was
considered to have no license information in it, and the top level
COPYING file license applied.
For non */uapi/* files that summary was:
SPDX license identifier # files
---------------------------------------------------|-------
GPL-2.0 11139
and resulted in the first patch in this series.
If that file was a */uapi/* path one, it was "GPL-2.0 WITH
Linux-syscall-note" otherwise it was "GPL-2.0". Results of that was:
SPDX license identifier # files
---------------------------------------------------|-------
GPL-2.0 WITH Linux-syscall-note 930
and resulted in the second patch in this series.
- if a file had some form of licensing information in it, and was one
of the */uapi/* ones, it was denoted with the Linux-syscall-note if
any GPL family license was found in the file or had no licensing in
it (per prior point). Results summary:
SPDX license identifier # files
---------------------------------------------------|------
GPL-2.0 WITH Linux-syscall-note 270
GPL-2.0+ WITH Linux-syscall-note 169
((GPL-2.0 WITH Linux-syscall-note) OR BSD-2-Clause) 21
((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause) 17
LGPL-2.1+ WITH Linux-syscall-note 15
GPL-1.0+ WITH Linux-syscall-note 14
((GPL-2.0+ WITH Linux-syscall-note) OR BSD-3-Clause) 5
LGPL-2.0+ WITH Linux-syscall-note 4
LGPL-2.1 WITH Linux-syscall-note 3
((GPL-2.0 WITH Linux-syscall-note) OR MIT) 3
((GPL-2.0 WITH Linux-syscall-note) AND MIT) 1
and that resulted in the third patch in this series.
- when the two scanners agreed on the detected license(s), that became
the concluded license(s).
- when there was disagreement between the two scanners (one detected a
license but the other didn't, or they both detected different
licenses) a manual inspection of the file occurred.
- In most cases a manual inspection of the information in the file
resulted in a clear resolution of the license that should apply (and
which scanner probably needed to revisit its heuristics).
- When it was not immediately clear, the license identifier was
confirmed with lawyers working with the Linux Foundation.
- If there was any question as to the appropriate license identifier,
the file was flagged for further research and to be revisited later
in time.
In total, over 70 hours of logged manual review was done on the
spreadsheet to determine the SPDX license identifiers to apply to the
source files by Kate, Philippe, Thomas and, in some cases, confirmation
by lawyers working with the Linux Foundation.
Kate also obtained a third independent scan of the 4.13 code base from
FOSSology, and compared selected files where the other two scanners
disagreed against that SPDX file, to see if there was new insights. The
Windriver scanner is based on an older version of FOSSology in part, so
they are related.
Thomas did random spot checks in about 500 files from the spreadsheets
for the uapi headers and agreed with SPDX license identifier in the
files he inspected. For the non-uapi files Thomas did random spot checks
in about 15000 files.
In initial set of patches against 4.14-rc6, 3 files were found to have
copy/paste license identifier errors, and have been fixed to reflect the
correct identifier.
Additionally Philippe spent 10 hours this week doing a detailed manual
inspection and review of the 12,461 patched files from the initial patch
version early this week with:
- a full scancode scan run, collecting the matched texts, detected
license ids and scores
- reviewing anything where there was a license detected (about 500+
files) to ensure that the applied SPDX license was correct
- reviewing anything where there was no detection but the patch license
was not GPL-2.0 WITH Linux-syscall-note to ensure that the applied
SPDX license was correct
This produced a worksheet with 20 files needing minor correction. This
worksheet was then exported into 3 different .csv files for the
different types of files to be modified.
These .csv files were then reviewed by Greg. Thomas wrote a script to
parse the csv files and add the proper SPDX tag to the file, in the
format that the file expected. This script was further refined by Greg
based on the output to detect more types of files automatically and to
distinguish between header and source .c files (which need different
comment types.) Finally Greg ran the script using the .csv files to
generate the patches.
Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org>
Reviewed-by: Philippe Ombredanne <pombredanne@nexb.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Kuninori Morimoto