diff options
| author | Rick Adams <rgadams@codeaurora.org> | 2010-09-28 10:21:07 -0700 |
|---|---|---|
| committer | Kyle Yan <kyan@codeaurora.org> | 2016-06-21 15:13:09 -0700 |
| commit | 44ed42824b3b3fa37be82227409f7d2f64b18c43 (patch) | |
| tree | cfd467e95ceb486d9a37a9355a25f0b12aa2d032 | |
| parent | b60e5b41b9b9298fd8268c34a96440c770e80d16 (diff) | |
msm: falcon: put reason for boot in procfs from SMEM
During board initialization read the shared memory item
SMEM_POWER_ON_STATUS_INFO and place it in the procfs at
/proc/sys/kernel/boot_reason
The data item is an integer with a bit being set to identify the reason
the device was powered on. The values of this data item is defined in
the document Document/arm/msm/boot.txt, the following is the data in the
documentation file.
power_on_status values set by the PMIC for power on event:
----------------------------------------------------------
0x01 -- keyboard power on
0x02 -- RTC alarm
0x04 -- cable power on
0x08 -- SMPL
0x10 -- Watch Dog timeout
0x20 -- USB charger
0x40 -- Wall charger
0xFF -- error reading power_on_status value
This is cherrypicked from commit <372d39f87b0da75>
("put reason for boot in procfs") of 3.18 tree.
Change-Id: I59e665f92e6e29f7dfef4380314f676a2d92c94b
Signed-off-by: Rick Adams <rgadams@codeaurora.org>
[abhimany: fix up minor merge conflicts]
Signed-off-by: Abhimanyu Kapur <abhimany@codeaurora.org>
Signed-off-by: Srinivas Ramana <sramana@codeaurora.org>
| -rw-r--r-- | Documentation/arm/msm/boot.txt | 23 | ||||
| -rw-r--r-- | arch/arm/include/asm/processor.h | 2 | ||||
| -rw-r--r-- | arch/arm/kernel/setup.c | 3 | ||||
| -rw-r--r-- | kernel/sysctl_binary.c | 1 |
4 files changed, 29 insertions, 0 deletions
diff --git a/Documentation/arm/msm/boot.txt b/Documentation/arm/msm/boot.txt new file mode 100644 index 000000000000..1a41cd532020 --- /dev/null +++ b/Documentation/arm/msm/boot.txt @@ -0,0 +1,23 @@ +Introduction +============= +The power management integrated circuit (PMIC) records the reason the +Application processor was powered on in Shared Memory. +The hardware and software used is the shared memory interface. This document +is not for the purpose of describing this interface, but to identify the +possible values for this data item. + +Description +=========== +Shared memory item (SMEM_POWER_ON_STATUS_INFO) is read to get access to +this data. The table below identifies the possible values stored. + +power_on_status values set by the PMIC for power on event: +---------------------------------------------------------- +0x01 -- keyboard power on +0x02 -- RTC alarm +0x04 -- cable power on +0x08 -- SMPL +0x10 -- Watch Dog timeout +0x20 -- USB charger +0x40 -- Wall charger +0xFF -- error reading power_on_status value diff --git a/arch/arm/include/asm/processor.h b/arch/arm/include/asm/processor.h index 8a1e8e995dae..04621d1a8848 100644 --- a/arch/arm/include/asm/processor.h +++ b/arch/arm/include/asm/processor.h @@ -30,6 +30,8 @@ #define STACK_TOP_MAX TASK_SIZE #endif +extern unsigned int boot_reason; + struct debug_info { #ifdef CONFIG_HAVE_HW_BREAKPOINT struct perf_event *hbp[ARM_MAX_HBP_SLOTS]; diff --git a/arch/arm/kernel/setup.c b/arch/arm/kernel/setup.c index a0ebc3d8afbc..a35c62bf9b37 100644 --- a/arch/arm/kernel/setup.c +++ b/arch/arm/kernel/setup.c @@ -114,6 +114,9 @@ EXPORT_SYMBOL(elf_hwcap2); char* (*arch_read_hardware_id)(void); EXPORT_SYMBOL(arch_read_hardware_id); +unsigned int boot_reason; +EXPORT_SYMBOL(boot_reason); + #ifdef MULTI_CPU struct processor processor __read_mostly; #endif diff --git a/kernel/sysctl_binary.c b/kernel/sysctl_binary.c index 15f80b481fcb..5ec5bbc09d39 100644 --- a/kernel/sysctl_binary.c +++ b/kernel/sysctl_binary.c @@ -138,6 +138,7 @@ static const struct bin_table bin_kern_table[] = { { CTL_INT, KERN_MAX_LOCK_DEPTH, "max_lock_depth" }, { CTL_INT, KERN_PANIC_ON_NMI, "panic_on_unrecovered_nmi" }, { CTL_INT, KERN_PANIC_ON_WARN, "panic_on_warn" }, + { CTL_INT, KERN_BOOT_REASON, "boot_reason" }, {} }; |