mirror of
https://github.com/AetherDroid/android_kernel_samsung_on5xelte.git
synced 2025-09-05 16:07:46 -04:00
Fixed MTP to work with TWRP
This commit is contained in:
commit
f6dfaef42e
50820 changed files with 20846062 additions and 0 deletions
30
Documentation/timers/hpet.txt
Normal file
30
Documentation/timers/hpet.txt
Normal file
|
@ -0,0 +1,30 @@
|
|||
High Precision Event Timer Driver for Linux
|
||||
|
||||
The High Precision Event Timer (HPET) hardware follows a specification
|
||||
by Intel and Microsoft which can be found at
|
||||
|
||||
http://www.intel.com/hardwaredesign/hpetspec_1.pdf
|
||||
|
||||
Each HPET has one fixed-rate counter (at 10+ MHz, hence "High Precision")
|
||||
and up to 32 comparators. Normally three or more comparators are provided,
|
||||
each of which can generate oneshot interrupts and at least one of which has
|
||||
additional hardware to support periodic interrupts. The comparators are
|
||||
also called "timers", which can be misleading since usually timers are
|
||||
independent of each other ... these share a counter, complicating resets.
|
||||
|
||||
HPET devices can support two interrupt routing modes. In one mode, the
|
||||
comparators are additional interrupt sources with no particular system
|
||||
role. Many x86 BIOS writers don't route HPET interrupts at all, which
|
||||
prevents use of that mode. They support the other "legacy replacement"
|
||||
mode where the first two comparators block interrupts from 8254 timers
|
||||
and from the RTC.
|
||||
|
||||
The driver supports detection of HPET driver allocation and initialization
|
||||
of the HPET before the driver module_init routine is called. This enables
|
||||
platform code which uses timer 0 or 1 as the main timer to intercept HPET
|
||||
initialization. An example of this initialization can be found in
|
||||
arch/x86/kernel/hpet.c.
|
||||
|
||||
The driver provides a userspace API which resembles the API found in the
|
||||
RTC driver framework. An example user space program is provided in
|
||||
file:Documentation/timers/hpet_example.c
|
Loading…
Add table
Add a link
Reference in a new issue