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path: root/drivers/rtc/rtc-cmos.c
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2016-12-19Merge tag 'rtc-4.10' of ↵Linus Torvalds1-3/+72
git://git.kernel.org/pub/scm/linux/kernel/git/abelloni/linux Pull RTC updates from Alexandre Belloni: "Subsystem: - non-modular drivers are now explicitly non-modular New driver: - Epson Toyocom rtc-7301sf/dg Drivers: - cmos: reject unsupported alarm values wrt the RTC capabilities - ds1307: ACPI support - jz4740: DT support, jz4780 handling, can now be used as a system power controller - mcp795: many fixes, in particular proper month handling - twl: driver is now DT only" * tag 'rtc-4.10' of git://git.kernel.org/pub/scm/linux/kernel/git/abelloni/linux: (31 commits) rtc: mcp795: Fix whitespace and indentation. rtc: mcp795: Prefer using the BIT() macro. rtc: mcp795: fix month write resetting date to 1. rtc: mcp795: fix time range difference between linux and RTC chip. rtc: mcp795: fix bitmask value for leap year (LP). rtc: mcp795: use bcd2bin/bin2bcd. rtc: add support for EPSON TOYOCOM RTC-7301SF/DG rtc: ds1307: Add ACPI support rtc: imxdi: (trivial) fix a typo rtc: ds1374: Merge conditional + WARN_ON() rtc: twl: make driver DT only rtc: twl: kill static variables rtc: fix typos in Kconfig rtc: jz4740: make the driver builtin only rtc: jz4740: remove unused EXPORT_SYMBOL Documentation: bindings: fix twl-rtc documentation rtc: Enable compile testing for Maxim and Samsung drivers MIPS: jz4740: Remove obsolete code MIPS: qi_lb60: Probe RTC driver from DT and use it as power controller MIPS: jz4740: DTS: Probe the jz4740-rtc driver from devicetree ...
2016-12-13Merge branch 'timers-core-for-linus' of ↵Linus Torvalds1-0/+7
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull timer updates from Thomas Gleixner: "The time/timekeeping/timer folks deliver with this update: - Fix a reintroduced signed/unsigned issue and cleanup the whole signed/unsigned mess in the timekeeping core so this wont happen accidentaly again. - Add a new trace clock based on boot time - Prevent injection of random sleep times when PM tracing abuses the RTC for storage - Make posix timers configurable for real tiny systems - Add tracepoints for the alarm timer subsystem so timer based suspend wakeups can be instrumented - The usual pile of fixes and updates to core and drivers" * 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (23 commits) timekeeping: Use mul_u64_u32_shr() instead of open coding it timekeeping: Get rid of pointless typecasts timekeeping: Make the conversion call chain consistently unsigned timekeeping_Force_unsigned_clocksource_to_nanoseconds_conversion alarmtimer: Add tracepoints for alarm timers trace: Update documentation for mono, mono_raw and boot clock trace: Add an option for boot clock as trace clock timekeeping: Add a fast and NMI safe boot clock timekeeping/clocksource_cyc2ns: Document intended range limitation timekeeping: Ignore the bogus sleep time if pm_trace is enabled selftests/timers: Fix spelling mistake "Asyncrhonous" -> "Asynchronous" clocksource/drivers/bcm2835_timer: Unmap region obtained by of_iomap clocksource/drivers/arm_arch_timer: Map frame with of_io_request_and_map() arm64: dts: rockchip: Arch counter doesn't tick in system suspend clocksource/drivers/arm_arch_timer: Don't assume clock runs in suspend posix-timers: Make them configurable posix_cpu_timers: Move the add_device_randomness() call to a proper place timer: Move sys_alarm from timer.c to itimer.c ptp_clock: Allow for it to be optional Kconfig: Regenerate *.c_shipped files after previous changes ...
2016-11-29timekeeping: Ignore the bogus sleep time if pm_trace is enabledChen Yu1-0/+7
Power management suspend/resume tracing (ab)uses the RTC to store suspend/resume information persistently. As a consequence the RTC value is clobbered when timekeeping is resumed and tries to inject the sleep time. Commit a4f8f6667f09 ("timekeeping: Cap array access in timekeeping_debug") plugged a out of bounds array access in the timekeeping debug code which was caused by the clobbered RTC value, but we still use the clobbered RTC value for sleep time injection into kernel timekeeping, which will result in random adjustments depending on the stored "hash" value. To prevent this keep track of the RTC clobbering and ignore the invalid RTC timestamp at resume. If the system resumed successfully clear the flag, which marks the RTC as unusable, warn the user about the RTC clobber and recommend to adjust the RTC with 'ntpdate' or 'rdate'. [jstultz: Fixed up pr_warn formating, and implemented suggestions from Ingo] [ tglx: Rewrote changelog ] Originally-from: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Chen Yu <yu.c.chen@intel.com> Signed-off-by: John Stultz <john.stultz@linaro.org> Acked-by: Pavel Machek <pavel@ucw.cz> Acked-by: Thomas Gleixner <tglx@linutronix.de> Cc: Prarit Bhargava <prarit@redhat.com> Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net> Cc: Richard Cochran <richardcochran@gmail.com> Cc: Xunlei Pang <xlpang@redhat.com> Cc: Len Brown <lenb@kernel.org> Link: http://lkml.kernel.org/r/1480372524-15181-3-git-send-email-john.stultz@linaro.org Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2016-10-20rtc: cmos: Don't enable interrupts in the middle of the interrupt handlerVille Syrjälä1-2/+3
Using spin_lock_irq()/spin_unlock_irq() from within the interrupt handler is a no-no. Let's save/restore the flags to avoid turning on interrupts prematurely. We hit this in a bunch of our CI systems, but for whatever reason I wasn't able to reproduce on my own machine, so this fix is just based on the backtrace. [ 202.634918] WARNING: CPU: 0 PID: 0 at kernel/locking/lockdep.c:2729 trace_hardirqs_on_caller+0x113/0x1b0 [ 202.634919] DEBUG_LOCKS_WARN_ON(current->hardirq_context) [ 202.634929] Modules linked in: snd_hda_intel i915 x86_pkg_temp_thermal intel_powerclamp coretemp crct10dif_pclmul crc32_pclmul ghash_clmulni_intel lpc_ich snd_hda_codec_realtek snd_hda_codec_generic snd_hda_codec_hdmi snd_hda_codec snd_hwdep i2c_designware_platform i2c_designware_core snd_hda_core mei_me mei snd_pcm r8169 mii sdhci_acpi sdhci mmc_core i2c_hid [last unloaded: i915] [ 202.634930] CPU: 0 PID: 0 Comm: swapper/0 Tainted: G U 4.9.0-rc1-CI-CI_DRM_1734+ #1 [ 202.634931] Hardware name: GIGABYTE M4HM87P-00/M4HM87P-00, BIOS F6 12/10/2014 [ 202.634933] ffff88011ea03d68 ffffffff8142dce5 ffff88011ea03db8 0000000000000000 [ 202.634934] ffff88011ea03da8 ffffffff8107e496 00000aa900000002 ffffffff81e249a0 [ 202.634935] ffffffff81815637 ffffffff82e7c280 0000000000000000 0000000000000004 [ 202.634936] Call Trace: [ 202.634939] <IRQ> [ 202.634939] [<ffffffff8142dce5>] dump_stack+0x67/0x92 [ 202.634941] [<ffffffff8107e496>] __warn+0xc6/0xe0 [ 202.634944] [<ffffffff81815637>] ? _raw_spin_unlock_irq+0x27/0x50 [ 202.634945] [<ffffffff8107e4fa>] warn_slowpath_fmt+0x4a/0x50 [ 202.634946] [<ffffffff810d6d83>] trace_hardirqs_on_caller+0x113/0x1b0 [ 202.634948] [<ffffffff810d6e2d>] trace_hardirqs_on+0xd/0x10 [ 202.634949] [<ffffffff81815637>] _raw_spin_unlock_irq+0x27/0x50 [ 202.634951] [<ffffffff81672042>] rtc_handler+0x32/0xa0 [ 202.634954] [<ffffffff814c08a3>] acpi_ev_fixed_event_detect+0xd4/0xfb [ 202.634956] [<ffffffff814c2ccb>] acpi_ev_sci_xrupt_handler+0xf/0x2d [ 202.634957] [<ffffffff814ab3ee>] acpi_irq+0x11/0x2c [ 202.634960] [<ffffffff810e5288>] __handle_irq_event_percpu+0x58/0x370 [ 202.634961] [<ffffffff810e55be>] handle_irq_event_percpu+0x1e/0x50 [ 202.634962] [<ffffffff810e5624>] handle_irq_event+0x34/0x60 [ 202.634963] [<ffffffff810e8906>] handle_fasteoi_irq+0xa6/0x170 [ 202.634966] [<ffffffff8101eef5>] handle_irq+0x15/0x20 [ 202.634967] [<ffffffff8101e548>] do_IRQ+0x68/0x130 [ 202.634968] [<ffffffff81816789>] common_interrupt+0x89/0x89 [ 202.634970] <EOI> [ 202.634970] [<ffffffff81814c73>] ? mwait_idle+0x93/0x210 [ 202.634971] [<ffffffff81814c6a>] ? mwait_idle+0x8a/0x210 [ 202.634972] [<ffffffff81026b0a>] arch_cpu_idle+0xa/0x10 [ 202.634973] [<ffffffff8181509e>] default_idle_call+0x1e/0x30 [ 202.634974] [<ffffffff810cbf6c>] cpu_startup_entry+0x17c/0x1f0 [ 202.634976] [<ffffffff8180ca87>] rest_init+0x127/0x130 [ 202.634978] [<ffffffff81f77f08>] start_kernel+0x3f6/0x403 [ 202.634980] [<ffffffff81f7728f>] x86_64_start_reservations+0x2a/0x2c [ 202.634981] [<ffffffff81f77404>] x86_64_start_kernel+0x173/0x186 [ 202.634982] ---[ end trace 293c99618fa08d34 ]--- Cc: Gabriele Mazzotta <gabriele.mzt@gmail.com> Cc: Alexandre Belloni <alexandre.belloni@free-electrons.com> Fixes: 983bf1256edb ("rtc: cmos: Clear ACPI-driven alarms upon resume") Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk> Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
2016-10-19rtc: cmos: don't refer to asm-generic/rtc.hChristoph Hellwig1-3/+0
That header has been gone for a while. I've fixed up the Kconfig comment, but the one in rtc-cmos.c doesn't make any sense to me even looking at its history. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
2016-10-19rtc: cmos: Reject unsupported alarm valuesGabriele Mazzotta1-0/+72
Some platforms allows to specify the month and day of the month in which an alarm should go off, some others the day of the month and some others just the time. Currently any given value is accepted by the driver and only the supported fields are used to program the hardware. As consequence, alarms are potentially programmed to go off in the wrong moment. Fix this by rejecting any unsupported value. Signed-off-by: Gabriele Mazzotta <gabriele.mzt@gmail.com> Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
2016-10-19rtc: cmos: remove all __exit_p annotationsLABBE Corentin1-5/+5
I got the following stack trace under qemu: [ 7.575243] BUG: unable to handle kernel NULL pointer dereference at 0000000000000010 [ 7.596098] IP: [<ffffffff814f5b08>] cmos_set_alarm+0x38/0x280 [ 7.615699] PGD 3ccbe067 [ 7.615923] PUD 3daf2067 [ 7.635156] PMD 0 [ 7.654358] Oops: 0000 [#1] SMP [ 7.673869] Modules linked in: [ 7.693235] CPU: 0 PID: 1701 Comm: hwclock Tainted: G W 4.9.0-rc1+ #24 [ 7.712455] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.9.3-0-ge2fc41e-prebuilt.qemu-project.org 04/01/2014 [ 7.753569] task: ffff88003d88dc40 task.stack: ffffc90000224000 [ 7.773743] RIP: 0010:[<ffffffff814f5b08>] [<ffffffff814f5b08>] cmos_set_alarm+0x38/0x280 [ 7.794893] RSP: 0018:ffffc90000227c10 EFLAGS: 00010296 [ 7.815890] RAX: 000000000000001d RBX: ffffc90000227d28 RCX: ffffffff8182be78 [ 7.836057] RDX: 0000000000000001 RSI: 0000000000000202 RDI: 0000000000000202 [ 7.856612] RBP: ffffc90000227c48 R08: 0000000000000000 R09: 0000000000000001 [ 7.877561] R10: 00000000000001c0 R11: 00000000000001c0 R12: 0000000000000000 [ 7.897072] R13: ffff88003d96f400 R14: ffff88003dac6410 R15: ffff88003dac6420 [ 7.917403] FS: 00007f77f42d9700(0000) GS:ffff88003fc00000(0000) knlGS:0000000000000000 [ 7.938293] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 7.958364] CR2: 0000000000000010 CR3: 000000003ccbb000 CR4: 00000000000006f0 [ 7.978028] Stack: [ 7.997120] ffff88003dac6000 ffff88003dac6410 0000000058049d01 ffffc90000227d28 [ 8.016993] ffff88003dac6000 ffff88003dac6410 ffff88003dac6420 ffffc90000227c98 [ 8.039505] ffffffff814f225d 0000001800227c98 000000090000002a 0000000900000011 [ 8.059985] Call Trace: [ 8.080110] [<ffffffff814f225d>] __rtc_set_alarm+0x8d/0xa0 [ 8.099421] [<ffffffff814f2389>] rtc_timer_enqueue+0x119/0x190 [ 8.119925] [<ffffffff814f2e6e>] rtc_update_irq_enable+0xbe/0x100 [ 8.140583] [<ffffffff814f3bb0>] rtc_dev_ioctl+0x3c0/0x480 [ 8.161162] [<ffffffff81146b6a>] ? user_path_at_empty+0x3a/0x50 [ 8.182717] [<ffffffff8114aa36>] do_vfs_ioctl+0x96/0x5c0 [ 8.204624] [<ffffffff8113e066>] ? vfs_stat+0x16/0x20 [ 8.225994] [<ffffffff8113e135>] ? SyS_newstat+0x15/0x30 [ 8.247043] [<ffffffff8114afa7>] SyS_ioctl+0x47/0x80 [ 8.267191] [<ffffffff815f5c77>] entry_SYSCALL_64_fastpath+0x1a/0xa9 [ 8.288719] Code: 6a 81 48 89 e5 41 57 41 56 41 55 49 89 fd 41 54 53 48 89 f3 48 c7 c6 20 c4 78 81 48 83 ec 10 e8 8f 00 ef ff 4d 8b a5 a0 00 00 00 <41> 8b 44 24 10 85 c0 0f 8e 2b 02 00 00 4c 89 ef 31 c0 b9 53 01 [ 8.335233] RIP [<ffffffff814f5b08>] cmos_set_alarm+0x38/0x280 [ 8.357096] RSP <ffffc90000227c10> [ 8.379051] CR2: 0000000000000010 [ 8.401736] ---[ end trace 5cbcd83a1f225ed3 ]--- This occur only when CONFIG_DEBUG_TEST_DRIVER_REMOVE is enabled and CONFIG_RTC_DRV_CMOS builtin. When cmos_set_alarm() is called dev is NULL and so trigger the deref via cmos->irq The problem comes from that the device is removed but no remove function are called due to _exit_p(). This patch remove all _exit_p() annotation. Signed-off-by: Corentin Labbe <clabbe.montjoie@gmail.com> Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
2016-09-22rtc: cmos: avoid unused function warningArnd Bergmann1-17/+4
A bug fix for the ACPI side of this driver caused a harmless build warning: drivers/rtc/rtc-cmos.c:1115:13: error: 'cmos_check_acpi_rtc_status' defined but not used [-Werror=unused-function] static void cmos_check_acpi_rtc_status(struct device *dev, We can avoid the warning and simplify the driver at the same time by removing the #ifdef for CONFIG_PM and rely on the SIMPLE_DEV_PM_OPS() to set everything up correctly. cmos_resume() has to get marked as __maybe_unused so we don't introduce another warning, and the two variants of cmos_poweroff() can get merged into one using an IS_ENABLED() check. Fixes: 983bf1256edb ("rtc: cmos: Clear ACPI-driven alarms upon resume") Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
2016-09-21rtc: cmos: Restore alarm after resumeGabriele Mazzotta1-0/+23
Some platform firmware may interfere with the RTC alarm over suspend, resulting in the kernel and hardware having different ideas about system state but also potentially causing problems with firmware that assumes the OS will clean this case up. This patch restores the RTC alarm on resume to ensure that kernel and hardware are in sync. The case we've seen is Intel Rapid Start, which is a firmware-mediated feature that automatically transitions systems from suspend-to-RAM to suspend-to-disk without OS involvement. It does this by setting the RTC alarm and a flag that indicates that on wake it should perform the transition rather than re-starting the OS. However, if the OS has set a wakeup alarm that would wake the machine earlier, it refuses to overwrite it and allows the system to wake instead. This fails in the following situation: 1) User configures Intel Rapid Start to transition after (say) 15 minutes 2) User suspends to RAM. Firmware sets the wakeup alarm for 15 minutes in the future 3) User resumes after 5 minutes. Firmware does not reset the alarm, and as such it is still set for 10 minutes in the future 4) User suspends after 5 minutes. Firmware notices that the alarm is set for 5 minutes in the future, which is less than the 15 minute transition threshold. It therefore assumes that the user wants the machine to wake in 5 minutes 5) System resumes after 5 minutes The worst case scenario here is that the user may have put the system in a bag between (4) and (5), resulting in it running in a confined space and potentially overheating. This seems reasonably important. The Rapid Start support code got added in 3.11, but it can be configured in the firmware regardless of kernel support. Signed-off-by: Gabriele Mazzotta <gabriele.mzt@gmail.com> Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
2016-09-21rtc: cmos: Clear ACPI-driven alarms upon resumeGabriele Mazzotta1-0/+47
Currently ACPI-driven alarms are not cleared when they wake the system. As consequence, expired alarms must be manually cleared to program a new alarm. Fix this by correctly handling ACPI-driven alarms. More specifically, the ACPI specification [1] provides for two alternative implementations of the RTC. Depending on the implementation, the driver either clear the alarm from the resume callback or from ACPI interrupt handler: - The platform has the RTC wakeup status fixed in hardware (ACPI_FADT_FIXED_RTC is 0). In this case the driver can determine if the RTC was the reason of the wakeup from the resume callback by reading the RTC status register. - The platform has no fixed hardware feature event bits. In this case a GPE is used to wake the system and the driver clears the alarm from its handler. [1] http://www.acpi.info/DOWNLOADS/ACPI_5_Errata%20A.pdf Signed-off-by: Gabriele Mazzotta <gabriele.mzt@gmail.com> Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
2016-09-20rtc: cmos: Initialize hpet timer before irq is registeredPratyush Anand1-1/+3
We have observed on few x86 machines with rtc-cmos device that hpet_rtc_interrupt() is called just after irq registration and before cmos_do_probe() could call hpet_rtc_timer_init(). So, neither hpet_default_delta nor hpet_t1_cmp is initialized by the time interrupt is raised in the given situation, and this results in NMI watchdog LOCKUP. It has only been observed sporadically on kdump secondary kernels. See the call trace: ---<-snip->--- [ 27.913194] Kernel panic - not syncing: Watchdog detected hard LOCKUP on cpu 0 [ 27.915371] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 3.10.0-342.el7.x86_64 #1 [ 27.917503] Hardware name: HP ProLiant DL160 Gen8, BIOS J03 02/10/2014 [ 27.919455] ffffffff8186a728 0000000059c82488 ffff880034e05af0 ffffffff81637bd4 [ 27.921870] ffff880034e05b70 ffffffff8163144a 0000000000000010 ffff880034e05b80 [ 27.924257] ffff880034e05b20 0000000059c82488 0000000000000000 0000000000000000 [ 27.926599] Call Trace: [ 27.927352] <NMI> [<ffffffff81637bd4>] dump_stack+0x19/0x1b [ 27.929080] [<ffffffff8163144a>] panic+0xd8/0x1e7 [ 27.930588] [<ffffffff8111d3e0>] ? restart_watchdog_hrtimer+0x50/0x50 [ 27.932502] [<ffffffff8111d4a2>] watchdog_overflow_callback+0xc2/0xd0 [ 27.934427] [<ffffffff811612c1>] __perf_event_overflow+0xa1/0x250 [ 27.936232] [<ffffffff81161d94>] perf_event_overflow+0x14/0x20 [ 27.937957] [<ffffffff81032ae8>] intel_pmu_handle_irq+0x1e8/0x470 [ 27.939799] [<ffffffff8164164b>] perf_event_nmi_handler+0x2b/0x50 [ 27.941649] [<ffffffff81640d99>] nmi_handle.isra.0+0x69/0xb0 [ 27.943348] [<ffffffff81640f49>] do_nmi+0x169/0x340 [ 27.944802] [<ffffffff816401d3>] end_repeat_nmi+0x1e/0x2e [ 27.946424] [<ffffffff81056ee5>] ? hpet_rtc_interrupt+0x85/0x380 [ 27.948197] [<ffffffff81056ee5>] ? hpet_rtc_interrupt+0x85/0x380 [ 27.949992] [<ffffffff81056ee5>] ? hpet_rtc_interrupt+0x85/0x380 [ 27.951816] <<EOE>> <IRQ> [<ffffffff8108f5a3>] ? run_timer_softirq+0x43/0x340 [ 27.954114] [<ffffffff8111e24e>] handle_irq_event_percpu+0x3e/0x1e0 [ 27.955962] [<ffffffff8111e42d>] handle_irq_event+0x3d/0x60 [ 27.957635] [<ffffffff811210c7>] handle_edge_irq+0x77/0x130 [ 27.959332] [<ffffffff8101704f>] handle_irq+0xbf/0x150 [ 27.960949] [<ffffffff8164a86f>] do_IRQ+0x4f/0xf0 [ 27.962434] [<ffffffff8163faed>] common_interrupt+0x6d/0x6d [ 27.964101] <EOI> [<ffffffff8163f43b>] ? _raw_spin_unlock_irqrestore+0x1b/0x40 [ 27.966308] [<fffff8111ff07>] __setup_irq+0x2a7/0x570 [ 28.067859] [<ffffffff81056e60>] ? hpet_cpuhp_notify+0x140/0x140 [ 28.069709] [<ffffffff8112032c>] request_threaded_irq+0xcc/0x170 [ 28.071585] [<ffffffff814b24a6>] cmos_do_probe+0x1e6/0x450 [ 28.073240] [<ffffffff814b2710>] ? cmos_do_probe+0x450/0x450 [ 28.074911] [<ffffffff814b27cb>] cmos_pnp_probe+0xbb/0xc0 [ 28.076533] [<ffffffff8139b245>] pnp_device_probe+0x65/0xd0 [ 28.078198] [<ffffffff813f8ca7>] driver_probe_device+0x87/0x390 [ 28.079971] [<ffffffff813f9083>] __driver_attach+0x93/0xa0 [ 28.081660] [<ffffffff813f8ff0>] ? __device_attach+0x40/0x40 [ 28.083662] [<ffffffff813f6a13>] bus_for_each_dev+0x73/0xc0 [ 28.085370] [<ffffffff813f86fe>] driver_attach+0x1e/0x20 [ 28.086974] [<ffffffff813f8250>] bus_add_driver+0x200/0x2d0 [ 28.088634] [<ffffffff81ade49a>] ? rtc_sysfs_init+0xe/0xe [ 28.090349] [<ffffffff813f9704>] driver_register+0x64/0xf0 [ 28.091989] [<ffffffff8139b070>] pnp_register_driver+0x20/0x30 [ 28.093707] [<ffffffff81ade4ab>] cmos_init+0x11/0x71 ---<-snip->--- This patch moves hpet_rtc_timer_init() before IRQ registration, so that we can gracefully handle such spurious interrupts. It also masks HPET RTC interrupts, in case IRQ registration fails. We were able to reproduce the problem in maximum 15 trials of kdump secondary kernel boot on an hp-dl160gen8 FCoE host machine without this patch. However, more than 35 trials went fine after applying this patch. Suggested-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Pratyush Anand <panand@redhat.com> Acked-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
2016-07-09rtc: simplify implementations of read_alarmUwe Kleine-König1-3/+0
Since commit d68778b80dd7 ("rtc: initialize output parameter for read alarm to "uninitialized"") there is no need to explicitly set unsupported members to -1. So drop the respective assignments from drivers. Signed-off-by: Uwe Kleine-König <uwe@kleine-koenig.org> Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
2016-06-26mn10300: use RTC_DRV_CMOS instead of CONFIG_RTCArnd Bergmann1-1/+1
nn10300 has a dependency on mc146818_get_time/mc146818_set_time, which we want to move from the mc146818rtc.h header into the rtc subsystem, which in turn is not usable on mn10300. This changes mn10300 to use the modern rtc-cmos driver instead of the old RTC driver, and that in turn lets us completely remove the read_persistent_clock/update_persistent_clock callbacks. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
2016-06-04rtc: cmos: move mc146818rtc code out of asm-generic/rtc.hArnd Bergmann1-6/+6
Drivers should not really include stuff from asm-generic directly, and the PC-style cmos rtc driver does this in order to reuse the mc146818 implementation of get_rtc_time/set_rtc_time rather than the architecture specific one for the architecture it gets built for. To make it more obvious what is going on, this moves and renames the two functions into include/linux/mc146818rtc.h, which holds the other mc146818 specific code. Ideally it would be in a .c file, but that would require extra infrastructure as the functions are called by multiple drivers with conflicting dependencies. With this change, the asm-generic/rtc.h header also becomes much more generic, so it can be reused more easily across any architecture that still relies on the genrtc driver. The only caller of the internal __get_rtc_time/__set_rtc_time functions is in arch/alpha/kernel/rtc.c, and we just change those over to the new naming. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Geert Uytterhoeven <geert@linux-m68k.org> Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
2016-05-20rtc: Use IS_ENABLED() instead of checking for built-in or moduleJavier Martinez Canillas1-1/+1
The IS_ENABLED() macro checks if a Kconfig symbol has been enabled either built-in or as a module, use that macro instead of open coding the same. Signed-off-by: Javier Martinez Canillas <javier@osg.samsung.com> Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
2016-01-11rtc: cmos: prevent kernel warning on IRQ flags mismatchAndy Shevchenko1-1/+1
The Microsoft Surface 3 tablet shares interrupt line between RTC and one of SPI controllers. However, the rtc_cmos driver doesn't allow shared interrupts and user sees the following warning genirq: Flags mismatch irq 8. 00000080 (8086228E:02) vs. 00000000 (rtc0) ... [<ffffffffa004eb01>] pxa2xx_spi_probe+0x151/0x600 [spi_pxa2xx_platform] Allow RTC driver to use shared interrupts. Seems we are on the safe side to do just this simple change since cmos_interrupt() handler checks for the actual hardware status anyway. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
2015-09-05rtc: cmos: clean up cmos_nvram_read()/cmos_nvram_write()Vladimir Zapolskiy1-13/+0
The change removes redundant sysfs binary file boundary checks, since this task is already done on caller side in fs/sysfs/file.c Signed-off-by: Vladimir Zapolskiy <vz@mleia.com> Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
2015-09-05rtc: cmos: Revert "rtc-cmos: Add an alarm disable quirk"Adrian Huang1-50/+0
Commit d5a1c7e3fc38 ("rtc-cmos: Add an alarm disable quirk") that added a special quirk is not needed because [PATCH 1/2] of this patchset makes the kernel more robust: rtc-cmos: Cancel alarm timer if alarm time is equal to now+1 seconds Signed-off-by: Adrian Huang <ahuang12@lenovo.com> Tested-by: Egbert Eich <eich@suse.de> Tested-by: Diego Ercolani <diego.ercolani@gmail.com> Cc: Borislav Petkov <bp@suse.de> Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
2015-09-05rtc: cmos: Cancel alarm timer if alarm time is equal to now+1 secondsAdrian Huang1-4/+60
Steps to reproduce the problem: 1) Enable RTC wake-up option in BIOS Setup 2) Issue one of these commands in the OS: "poweroff" or "shutdown -h now" 3) System will shut down and then reboot automatically Root-cause of the issue: 1) During the shutdown process, the hwclock utility is used to save the system clock to hardware clock (RTC). 2) The hwclock utility invokes ioctl() with RTC_UIE_ON. The kernel configures the RTC alarm for the periodic interrupt (every 1 second). 3) The hwclock uitlity closes the /dev/rtc0 device, and the kernel disables the RTC alarm irq (AIE bit of Register B) via ioctl() with RTC_UIE_OFF. But, the configured alarm time is the current_time + 1. 4) After the next 1 second is elapsed, the AF (alarm interrupt flag) of Register C is set. 5) The S5 handler in BIOS is invoked to configure alarm registers (enable AIE bit and configure alarm date/time). But, BIOS does not clear the previous interrupt status during alarm configuration. Therefore, "AF=AIE=1" causes the rtc device to trigger an interrupt. 6) So, the machine reboots automatically right after shutdown. This patch cancels the alarm timer if the following condictions are met (suggested by Alexandre): 1) The configured alarm time is equal to current_time + 1 seconds. 2) The AIE timer is not in use. The member 'alarm_expires' is introduced in struct cmos_rtc because of the following reasons: 1) The configured alarm time can be retrieved from cmos_read_alarm(), but we need to take the 'wrapped timestamp' and 'time rollover' into consideration. The function __rtc_read_alarm() eliminates the concerns. To avoid the duplicated code in the lower level RTC driver, invoking __rtc_read_alarm from the lower level RTC driver is not encouraged. Moreover, the compilation error 'the undefined __rtc_read_alarm" is observed if the lower level RTC driver is compiled as a kernel module. 2) The uie_rtctimer.node.expires and aie_timer.node.expires can be retrieved for the configured alarm time. But, the problem is that either of them might configure the CMOS alarm time. We cannot make sure UIE timer or AIE tiemr configured the CMOS alarm time before. (uie_rtctimer or aie_timer is enabled and then is disabled). 3) The patch introduces the member 'alarm_expires' to keep the newly configured alarm time, so the above-mentioned concerns can be eliminated. The issue goes away after 20-time shutdown tests. Signed-off-by: Adrian Huang <ahuang12@lenovo.com> Tested-by: Egbert Eich <eich@suse.de> Tested-by: Diego Ercolani <diego.ercolani@gmail.com> Cc: Borislav Petkov <bp@suse.de> Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
2015-04-17rtc: use more standard kernel logging stylesJoe Perches1-2/+4
Neaten the logging a bit by adding #define pr_fmt Miscellanea: o Remove __FILE__/__func__ uses o Coalesce formats adding missing spaces o Align arguments o (rtc-cmos) Integrated 2 consecutive messages Signed-off-by: Joe Perches <joe@perches.com> Acked-by: Alexandre Belloni <alexandre.belloni@free-electrons.com> Cc: Alessandro Zummo <a.zummo@towertech.it> Cc: Joshua Kinard <kumba@gentoo.org> Cc: Chanwoo Choi <cw00.choi@samsung.com> Reviewed-by: Krzysztof Kozlowski <k.kozlowski@samsung.com> Tested-by: Krzysztof Kozlowski <k.kozlowski@samsung.com> Cc: Aaro Koskinen <aaro.koskinen@iki.fi> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2015-04-16rtc: remove use of seq_printf return valueJoe Perches1-17/+19
The seq_printf return value, because it's frequently misused, will eventually be converted to void. See: commit 1f33c41c03da ("seq_file: Rename seq_overflow() to seq_has_overflowed() and make public") Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2014-10-14rtc-cmos: fix wakeup from S5 without CONFIG_PM_SLEEPDaniel Glöckner1-1/+4
Commit b5ada4600dfd ("drivers/rtc/rtc-cmos.c: fix compilation warning when !CONFIG_PM_SLEEP") broke wakeup from S5 by making cmos_poweroff a nop unless CONFIG_PM_SLEEP was defined. Fix this by restricting the #ifdef to cmos_resume and restoring the old dependency on CONFIG_PM for cmos_suspend and cmos_poweroff. Signed-off-by: Daniel Glöckner <daniel-gl@gmx.net> Cc: Mika Westerberg <mika.westerberg@linux.intel.com> Cc: Alessandro Zummo <a.zummo@towertech.it> Cc: <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2014-06-07drivers/rtc/rtc-cmos.c: drivers/char/rtc.c features for DECstation supportMaciej W. Rozycki1-25/+60
This brings in drivers/char/rtc.c functionality required for DECstation and, should the maintainers decide to switch, Alpha systems to use rtc-cmos. Specifically these features are made available: * RTC iomem rather than x86/PCI port I/O mapping, controlled with the RTC_IOMAPPED macro as with the original driver. The DS1287A chip in all DECstation systems is mapped in the host bus address space as a contiguous block of 64 32-bit words of which the least significant byte accesses the RTC chip for both reads and writes. All the address and data window register accesses are made transparently by the chipset glue logic so that the device appears directly mapped on the host bus. * A way to set the size of the address space explicitly with the newly-added `address_space' member of the platform part of the RTC device structure. This avoids the unreliable heuristics that does not work in a setup where the RTC is not explicitly accessed with the usual address and data window register pair. * The ability to use the RTC periodic interrupt as a system clock device, which is implemented by arch/mips/kernel/cevt-ds1287.c for DECstation systems and takes the RTC interrupt away from the RTC driver. Eventually hooking back to the clock device's interrupt handler should be possible for the purpose of the alarm clock and possibly also update-in-progress interrupt, but this is not done by this change. o To avoid interfering with the clock interrupt all the places where the RTC interrupt mask is fiddled with are only executed if and IRQ has been assigned to the RTC driver. o To avoid changing the clock setup Register A is not fiddled with if CMOS_RTC_FLAGS_NOFREQ is set in the newly-added `flags' member of the platform part of the RTC device structure. Originally, in drivers/char/rtc.c, this was keyed with the absence of the RTC interrupt, just like the interrupt mask, but there only the periodic interrupt frequency is set, whereas rtc-cmos also sets the divider bits. Therefore a new flag is introduced so that systems where the RTC interrupt is not usable rather than used as a system clock device can fully initialise the RTC. * A small clean-up is made to the IRQ assignment code that makes the IRQ number hardcoded to -1 rather than arbitrary -ENXIO (or whatever error happens to be returned by platform_get_irq) where no IRQ has been assigned to the RTC driver (NO_IRQ might be another candidate, but it looks like this macro has inconsistent or missing definitions and limited use and might therefore be unsafe). Verified to work correctly with a DECstation 5000/240 system. [akpm@linux-foundation.org: fix weird code layout] Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org> Cc: Alessandro Zummo <a.zummo@towertech.it> Cc: Ralf Baechle <ralf@linux-mips.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2014-04-04drivers/rtc/rtc-cmos.c: fix compilation warning when !CONFIG_PM_SLEEPMika Westerberg1-5/+3
CONFIG_PM will be set also if only CONFIG_PM_RUNTIME is set which causes the compiler to emit following warning: drivers/rtc/rtc-cmos.c:845:12: warning: =E2=80=98cmos_resume=E2=80=99 defined but not used [-Wunused-function] Fix this by using CONFIG_PM_SLEEP instead of CONFIG_PM and removing it from the driver pm ops as this has been taken care by SIMPLE_DEV_PM_OPS() already. Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2014-01-24drivers/rtc/rtc-cmos.c: propagate hpet_register_irq_handler() failureAndrew Morton1-4/+2
If hpet_register_irq_handler() fails, cmos_do_probe() will incorrectly return 0. Reported-by: Julia Lawall <julia.lawall@lip6.fr> Cc: John Stultz <john.stultz@linaro.org> Cc: Grant Likely <grant.likely@linaro.org> Cc: Rob Herring <robh+dt@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2014-01-24drivers/rtc/rtc-cmos.c: remove superfluous name castGeert Uytterhoeven1-1/+1
device_driver.name is "const char *" Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Alessandro Zummo <a.zummo@towertech.it> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-12-24rtc-cmos: Add an alarm disable quirkBorislav Petkov1-1/+51
41c7f7424259f ("rtc: Disable the alarm in the hardware (v2)") added the functionality to disable the RTC wake alarm when shutting down the box. However, there are at least two b0rked BIOSes we know about: https://bugzilla.novell.com/show_bug.cgi?id=812592 https://bugzilla.novell.com/show_bug.cgi?id=805740 where, when wakeup alarm is enabled in the BIOS, the machine reboots automatically right after shutdown, regardless of what wakeup time is programmed. Bisecting the issue lead to this patch so disable its functionality with a DMI quirk only for those boxes. Cc: Brecht Machiels <brecht@mos6581.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: John Stultz <john.stultz@linaro.org> Cc: Rabin Vincent <rabin.vincent@stericsson.com> Cc: stable <stable@vger.kernel.org> Signed-off-by: Borislav Petkov <bp@suse.de> [jstultz: Changed variable name for clarity, added extra dmi entry] Tested-by: Brecht Machiels <brecht@mos6581.org> Tested-by: Borislav Petkov <bp@suse.de> Signed-off-by: John Stultz <john.stultz@linaro.org>
2013-11-13drivers/rtc/rtc-cmos.c: use dev_get_platdata()Jingoo Han1-1/+1
Use the wrapper function for retrieving the platform data instead of accessing dev->platform_data directly. This is a cosmetic change to make the code simpler and enhance the readability. Signed-off-by: Jingoo Han <jg1.han@samsung.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-11-13drivers/rtc/rtc-cmos.c: remove redundant dev_set_drvdataSachin Kamat1-1/+0
Driver core sets the driver data to NULL upon device_release or on probe failure. Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org> Cc: Jingoo Han <jg1.han@samsung.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-09-12rtc: convert rtc-cmos to dev_pm_ops from legacy pm_opsShuah Khan1-19/+5
Convert drivers/rtc/rtc-cmos to use dev_pm_ops instead of legacy pm_ops. This patch depends on pnp driver bus ops change to invoke pnp_driver dev_pm_ops. Signed-off-by: Shuah Khan <shuah.kh@samsung.com> Cc: Matthew Garrett <matthew.garrett@nebula.com> Cc: Leonidas Da Silva Barbosa <leosilva@linux.vnet.ibm.com> Cc: Ashley Lai <ashley@ashleylai.com> Cc: Rajiv Andrade <mail@srajiv.net> Cc: Marcel Selhorst <tpmdd@selhorst.net> Cc: Sirrix AG <tpmdd@sirrix.com> Cc: Alessandro Zummo <a.zummo@towertech.it> Cc: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com> Cc: Bjorn Helgaas <bhelgaas@google.com> Cc: Grant Likely <grant.likely@linaro.org> Cc: Rob Herring <rob.herring@calxeda.com> Cc: Peter Hüwe <PeterHuewe@gmx.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-07-04drivers/rtc/rtc-cmos.c: work around bios clearing rtc controlDerek Basehore1-13/+22
The bios may clear the rtc control register when resuming the system. Since the cmos interrupt handler may now be run before the rtc_cmos is resumed, this can cause the interrupt handler to ignore an alarm since the alarm bit is not set in the rtc control register. To work around this, check if the rtc_cmos is suspended and use the stored value for the rtc control register. Signed-off-by: Derek Basehore <dbasehore@chromium.org> Reviewed-by: Sameer Nanda <snanda@chromium.org> Cc: Alessandro Zummo <a.zummo@towertech.it> Cc: Jingoo Han <jg1.han@samsung.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: John Stultz <john.stultz@linaro.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-07-04drivers/rtc/rtc-cmos.c: fix whitespace related errorsSachin Kamat1-3/+3
Fixes the following types of issues: ERROR: space required after that ',' (ctx:VxV) WARNING: please, no spaces at the start of a line Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org> Cc: Jingoo Han <jg1.han@samsung.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-06-13drivers/rtc/rtc-cmos.c: fix accidentally enabling rtc channelDerek Basehore1-1/+3
During resume, we call hpet_rtc_timer_init after masking an irq bit in hpet. This will cause the call to hpet_disable_rtc_channel to be undone if RTC_AIE is the only bit not masked. Allowing the cmos interrupt handler to run before resuming caused some issues where the timer for the alarm was not removed. This would cause other, later timers to not be cleared, so utilities such as hwclock would time out when waiting for the update interrupt. [akpm@linux-foundation.org: coding-style tweak] Signed-off-by: Derek Basehore <dbasehore@chromium.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-04-30drivers/rtc/rtc-cmos.c: don't disable hpet emulation on suspendDerek Basehore1-2/+2
There's a bug where rtc alarms are ignored after the rtc cmos suspends but before the system finishes suspend. Since hpet emulation is disabled and it still handles the interrupts, a wake event is never registered which is done from the rtc layer. This patch reverts commit d1b2efa83fbf ("rtc: disable hpet emulation on suspend") which disabled hpet emulation. To fix the problem mentioned in that commit, hpet_rtc_timer_init() is called directly on resume. Signed-off-by: Derek Basehore <dbasehore@chromium.org> Cc: Maxim Levitsky <maximlevitsky@gmail.com> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@elte.hu> Cc: "Rafael J. Wysocki" <rjw@sisk.pl> Cc: <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-02-22rtc: rtc-cmos: use dev_warn()/dev_dbg() instead of printk()/pr_debug()Jingoo Han1-8/+4
Fix the checkpatch warning as below: WARNING: Prefer netdev_err(netdev, ... then dev_err(dev, ... then pr_err(... to printk(KERN_ERR ... Signed-off-by: Jingoo Han <jg1.han@samsung.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-02-22drivers/rtc: use of_match_ptr() macroSachin Kamat1-2/+1
This eliminates having an #ifdef returning NULL for the case when OF is disabled. Maintains consistency in cases where OF is always selected. Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org> Cc: Alessandro Zummo <a.zummo@towertech.it> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-01-04Drivers: rtc: remove __dev* attributes.Greg Kroah-Hartman1-6/+3
CONFIG_HOTPLUG is going away as an option. As a result, the __dev* markings need to be removed. This change removes the use of __devinit, __devexit_p, __devinitdata, __devinitconst, and __devexit from these drivers. Based on patches originally written by Bill Pemberton, but redone by me in order to handle some of the coding style issues better, by hand. Cc: Bill Pemberton <wfp5p@virginia.edu> Cc: Alessandro Zummo <a.zummo@towertech.it> Cc: Srinidhi Kasagar <srinidhi.kasagar@stericsson.com> Cc: Linus Walleij <linus.walleij@linaro.org> Cc: Mike Frysinger <vapier.adi@gmail.com> Cc: Wan ZongShun <mcuos.com@gmail.com> Cc: Guan Xuetao <gxt@mprc.pku.edu.cn> Cc: Mark Brown <broonie@opensource.wolfsonmicro.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-08-08RTC: Avoid races between RTC alarm wakeup and suspend.NeilBrown1-1/+0
If an RTC alarm fires just as suspend is happening, it is possible for suspend to complete and the alarm to be missed. To avoid the race, we must register the event with the PM core. As the event is made visible to userspace through a thread which is only scheduled by the interrupt, we need a pm_stay_awake/pm_relax pair preventing suspend from the interrupt until the thread completes its work. This makes the pm_wakeup_event() call in cmos_interrupt unnecessary as it provides suspend protection for all RTCs that use rtc_update_irq. Signed-off-by: NeilBrown <neilb@suse.de> Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
2012-07-18rtc-cmos: report wakeups from interrupt handlerPaul Fox1-0/+1
When suspending the system with an important RTC wake alarm active, it is possible that the RTC alarm will expire before the system has gone to sleep (e.g. short alarm timer, or an unusually long suspend routine). If this happens, the RTC alarm should trigger a wakeup event, possibly aborting system suspend. This condition can be detected in the form of an RTC alarm interrupt. Signed-off-by: Paul Fox <pgf@laptop.org> Signed-off-by: Daniel Drake <dsd@laptop.org> Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
2012-05-29rtc-cmos / PM: report wakeup event on ACPI RTC alarmDaniel Drake1-3/+6
When the ACPI-driven RTC alarm wakes the system, report it as a wakeup event. This allows userspace to determine that the reason for system wakeup was RTC alarm. Signed-off-by: Daniel Drake <dsd@laptop.org> Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
2012-03-24drivers/rtc: remove IRQF_DISABLEDYong Zhang1-1/+1
Since commit e58aa3d2d0cc ("genirq: run irq handlers with interrupts disabled") we run all interrupt handlers with interrupts disabled and we even check and yell when an interrupt handler returns with interrupts enabled - see commit b738a50a2026 ("genirq: warn when handler enables interrupts"). So now this flag is a NOOP and can be removed. Signed-off-by: Yong Zhang <yong.zhang0@gmail.com> Acked-by: Linus Walleij <linus.walleij@linaro.org> Acked-by: Wan ZongShun <mcuos.com@gmail.com> Cc: Alessandro Zummo <a.zummo@towertech.it> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@elte.hu> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2012-01-11drivers/rtc/rtc-cmos.c: fix broken NVRAM bank 2 writingOndrej Zary1-1/+1
Fix writing to NVRAM bank 2 in rtc-cmos driver. It never worked since its introduction in 2.6.28 because of a typo. Signed-off-by: Ondrej Zary <linux@rainbow-software.org> Cc: Alessandro Zummo <a.zummo@towertech.it> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2011-06-10treewide: Convert uses of struct resource to resource_size(ptr)Joe Perches1-3/+3
Several fixes as well where the +1 was missing. Done via coccinelle scripts like: @@ struct resource *ptr; @@ - ptr->end - ptr->start + 1 + resource_size(ptr) and some grep and typing. Mostly uncompiled, no cross-compilers. Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
2011-03-16Merge branch 'x86-platform-for-linus' of ↵Linus Torvalds1-0/+45
git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip * 'x86-platform-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: (27 commits) x86: Clean up apic.c and apic.h x86: Remove superflous goal definition of tsc_sync x86: dt: Correct local apic documentation in device tree bindings x86: dt: Cleanup local apic setup x86: dt: Fix OLPC=y/INTEL_CE=n build rtc: cmos: Add OF bindings x86: ce4100: Use OF to setup devices x86: ioapic: Add OF bindings for IO_APIC x86: dtb: Add generic bus probe x86: dtb: Add support for PCI devices backed by dtb nodes x86: dtb: Add device tree support for HPET x86: dtb: Add early parsing of IO_APIC x86: dtb: Add irq domain abstraction x86: dtb: Add a device tree for CE4100 x86: Add device tree support x86: e820: Remove conditional early mapping in parse_e820_ext x86: OLPC: Make OLPC=n build again x86: OLPC: Remove extra OLPC_OPENFIRMWARE_DT indirection x86: OLPC: Cleanup config maze completely x86: OLPC: Hide OLPC_OPENFIRMWARE config switch ... Fix up conflicts in arch/x86/platform/ce4100/ce4100.c
2011-03-09RTC: Cleanup rtc_class_ops->update_irq_enable()John Stultz1-20/+0
Now that the generic code handles UIE mode irqs via periodic alarm interrupts, no one calls the rtc_class_ops->update_irq_enable() method anymore. This patch removes the driver hooks and implementations of update_irq_enable if no one else is calling it. CC: Thomas Gleixner <tglx@linutronix.de> CC: Alessandro Zummo <a.zummo@towertech.it> CC: Marcelo Roberto Jimenez <mroberto@cpti.cetuc.puc-rio.br> CC: rtc-linux@googlegroups.com Signed-off-by: John Stultz <john.stultz@linaro.org>
2011-03-09RTC: Cleanup rtc_class_ops->irq_set_freq()John Stultz1-26/+0
With the generic rtc code now emulating PIE mode irqs via an hrtimer, no one calls the rtc_class_ops->irq_set_freq call. This patch removes the hook and deletes the driver functions if no one else calls them. CC: Thomas Gleixner <tglx@linutronix.de> CC: Alessandro Zummo <a.zummo@towertech.it> CC: Marcelo Roberto Jimenez <mroberto@cpti.cetuc.puc-rio.br> CC: rtc-linux@googlegroups.com Signed-off-by: John Stultz <john.stultz@linaro.org>
2011-03-09RTC: Cleanup rtc_class_ops->irq_set_stateJohn Stultz1-20/+0
With PIE mode interrupts now emulated in generic code via an hrtimer, no one calls rtc_class_ops->irq_set_state(), so this patch removes it along with driver implementations. CC: Thomas Gleixner <tglx@linutronix.de> CC: Alessandro Zummo <a.zummo@towertech.it> CC: Marcelo Roberto Jimenez <mroberto@cpti.cetuc.puc-rio.br> CC: rtc-linux@googlegroups.com Signed-off-by: John Stultz <john.stultz@linaro.org>
2011-02-24rtc: cmos: Add OF bindingsSebastian Andrzej Siewior1-0/+45
This allows to load the OF driver based informations from the device tree. Systems without BIOS may need to perform some initialization. PowerPC creates a PNP device from the OF information and performs this kind of initialization in their private PCI quirk. This looks more generic. This patch also avoids registering the platform RTC driver on X86 if we have a device tree blob. Otherwise we would setup the device based on the hardcoded information in arch/x86 rather than the device tree based one. [ tglx: Changed "int of_have_populated_dt()" to bool as recommended by Grant ] Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by: Dirk Brandewie <dirk.brandewie@gmail.com> Acked-by: Grant Likely <grant.likely@secretlab.ca> Cc: sodaville@linutronix.de Cc: devicetree-discuss@lists.ozlabs.org Cc: rtc-linux@googlegroups.com Cc: Alessandro Zummo <a.zummo@towertech.it> LKML-Reference: <1298405266-1624-12-git-send-email-bigeasy@linutronix.de> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2011-01-13rtc-cmos: fix suspend/resumePaul Fox1-7/+9
rtc-cmos was setting suspend/resume hooks at the device_driver level. However, the platform bus code (drivers/base/platform.c) only looks for resume hooks at the dev_pm_ops level, or within the platform_driver. Switch rtc_cmos to use dev_pm_ops so that suspend/resume code is executed again. Paul said: : The user visible symptom in our (XO laptop) case was that rtcwake would : fail to wake the laptop. The RTC alarm would expire, but the wakeup : wasn't unmasked. : : As for severity, the impact may have been reduced because if I recall : correctly, the bug only affected platforms with CONFIG_PNP disabled. Signed-off-by: Paul Fox <pgf@laptop.org> Signed-off-by: Daniel Drake <dsd@laptop.org> Acked-by: Rafael J. Wysocki <rjw@sisk.pl> Cc: <stable@kernel.org> [2.6.37.x] Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-11-29rtc-cmos.c : Fix warning on PowerPCSrikanth Krishnakar1-1/+2
The following warning is seen while compilation of PowerPC kernel: CC drivers/rtc/rtc-cmos.o drivers/rtc/rtc-cmos.c:697:2: warning: #warning Assuming 128 bytes of RTC+NVRAM address space, not 64 bytes. Fix it by adding defined(__powerpc__). Signed-off-by: Srikanth Krishnakar <skrishna@mvista.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
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