mirror of
https://github.com/torvalds/linux.git
synced 2024-11-11 14:42:24 +00:00
kernel-api.tmpl: convert it to ReST
Brainless conversion of genericirq.tmpl book to ReST, via Documentation/sphinx/tmplcvt Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com> Signed-off-by: Jonathan Corbet <corbet@lwn.net>
This commit is contained in:
parent
76d40fae13
commit
baca8a0c99
@ -9,7 +9,7 @@
|
||||
DOCBOOKS := z8530book.xml \
|
||||
kernel-hacking.xml kernel-locking.xml \
|
||||
writing_usb_driver.xml networking.xml \
|
||||
kernel-api.xml filesystems.xml lsm.xml kgdb.xml \
|
||||
filesystems.xml lsm.xml kgdb.xml \
|
||||
gadget.xml libata.xml mtdnand.xml librs.xml rapidio.xml \
|
||||
s390-drivers.xml scsi.xml \
|
||||
sh.xml w1.xml \
|
||||
|
@ -1,331 +0,0 @@
|
||||
<?xml version="1.0" encoding="UTF-8"?>
|
||||
<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook XML V4.1.2//EN"
|
||||
"http://www.oasis-open.org/docbook/xml/4.1.2/docbookx.dtd" []>
|
||||
|
||||
<book id="LinuxKernelAPI">
|
||||
<bookinfo>
|
||||
<title>The Linux Kernel API</title>
|
||||
|
||||
<legalnotice>
|
||||
<para>
|
||||
This documentation is free software; you can redistribute
|
||||
it and/or modify it under the terms of the GNU General Public
|
||||
License as published by the Free Software Foundation; either
|
||||
version 2 of the License, or (at your option) any later
|
||||
version.
|
||||
</para>
|
||||
|
||||
<para>
|
||||
This program is distributed in the hope that it will be
|
||||
useful, but WITHOUT ANY WARRANTY; without even the implied
|
||||
warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
|
||||
See the GNU General Public License for more details.
|
||||
</para>
|
||||
|
||||
<para>
|
||||
You should have received a copy of the GNU General Public
|
||||
License along with this program; if not, write to the Free
|
||||
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston,
|
||||
MA 02111-1307 USA
|
||||
</para>
|
||||
|
||||
<para>
|
||||
For more details see the file COPYING in the source
|
||||
distribution of Linux.
|
||||
</para>
|
||||
</legalnotice>
|
||||
</bookinfo>
|
||||
|
||||
<toc></toc>
|
||||
|
||||
<chapter id="adt">
|
||||
<title>Data Types</title>
|
||||
<sect1><title>Doubly Linked Lists</title>
|
||||
!Iinclude/linux/list.h
|
||||
</sect1>
|
||||
</chapter>
|
||||
|
||||
<chapter id="libc">
|
||||
<title>Basic C Library Functions</title>
|
||||
|
||||
<para>
|
||||
When writing drivers, you cannot in general use routines which are
|
||||
from the C Library. Some of the functions have been found generally
|
||||
useful and they are listed below. The behaviour of these functions
|
||||
may vary slightly from those defined by ANSI, and these deviations
|
||||
are noted in the text.
|
||||
</para>
|
||||
|
||||
<sect1><title>String Conversions</title>
|
||||
!Elib/vsprintf.c
|
||||
!Finclude/linux/kernel.h kstrtol
|
||||
!Finclude/linux/kernel.h kstrtoul
|
||||
!Elib/kstrtox.c
|
||||
</sect1>
|
||||
<sect1><title>String Manipulation</title>
|
||||
<!-- All functions are exported at now
|
||||
X!Ilib/string.c
|
||||
-->
|
||||
!Elib/string.c
|
||||
</sect1>
|
||||
<sect1><title>Bit Operations</title>
|
||||
!Iarch/x86/include/asm/bitops.h
|
||||
</sect1>
|
||||
</chapter>
|
||||
|
||||
<chapter id="kernel-lib">
|
||||
<title>Basic Kernel Library Functions</title>
|
||||
|
||||
<para>
|
||||
The Linux kernel provides more basic utility functions.
|
||||
</para>
|
||||
|
||||
<sect1><title>Bitmap Operations</title>
|
||||
!Elib/bitmap.c
|
||||
!Ilib/bitmap.c
|
||||
</sect1>
|
||||
|
||||
<sect1><title>Command-line Parsing</title>
|
||||
!Elib/cmdline.c
|
||||
</sect1>
|
||||
|
||||
<sect1 id="crc"><title>CRC Functions</title>
|
||||
!Elib/crc7.c
|
||||
!Elib/crc16.c
|
||||
!Elib/crc-itu-t.c
|
||||
!Elib/crc32.c
|
||||
!Elib/crc-ccitt.c
|
||||
</sect1>
|
||||
|
||||
<sect1 id="idr"><title>idr/ida Functions</title>
|
||||
!Pinclude/linux/idr.h idr sync
|
||||
!Plib/idr.c IDA description
|
||||
!Elib/idr.c
|
||||
</sect1>
|
||||
</chapter>
|
||||
|
||||
<chapter id="mm">
|
||||
<title>Memory Management in Linux</title>
|
||||
<sect1><title>The Slab Cache</title>
|
||||
!Iinclude/linux/slab.h
|
||||
!Emm/slab.c
|
||||
!Emm/util.c
|
||||
</sect1>
|
||||
<sect1><title>User Space Memory Access</title>
|
||||
!Iarch/x86/include/asm/uaccess_32.h
|
||||
!Earch/x86/lib/usercopy_32.c
|
||||
</sect1>
|
||||
<sect1><title>More Memory Management Functions</title>
|
||||
!Emm/readahead.c
|
||||
!Emm/filemap.c
|
||||
!Emm/memory.c
|
||||
!Emm/vmalloc.c
|
||||
!Imm/page_alloc.c
|
||||
!Emm/mempool.c
|
||||
!Emm/dmapool.c
|
||||
!Emm/page-writeback.c
|
||||
!Emm/truncate.c
|
||||
</sect1>
|
||||
</chapter>
|
||||
|
||||
|
||||
<chapter id="ipc">
|
||||
<title>Kernel IPC facilities</title>
|
||||
|
||||
<sect1><title>IPC utilities</title>
|
||||
!Iipc/util.c
|
||||
</sect1>
|
||||
</chapter>
|
||||
|
||||
<chapter id="kfifo">
|
||||
<title>FIFO Buffer</title>
|
||||
<sect1><title>kfifo interface</title>
|
||||
!Iinclude/linux/kfifo.h
|
||||
</sect1>
|
||||
</chapter>
|
||||
|
||||
<chapter id="relayfs">
|
||||
<title>relay interface support</title>
|
||||
|
||||
<para>
|
||||
Relay interface support
|
||||
is designed to provide an efficient mechanism for tools and
|
||||
facilities to relay large amounts of data from kernel space to
|
||||
user space.
|
||||
</para>
|
||||
|
||||
<sect1><title>relay interface</title>
|
||||
!Ekernel/relay.c
|
||||
!Ikernel/relay.c
|
||||
</sect1>
|
||||
</chapter>
|
||||
|
||||
<chapter id="modload">
|
||||
<title>Module Support</title>
|
||||
<sect1><title>Module Loading</title>
|
||||
!Ekernel/kmod.c
|
||||
</sect1>
|
||||
<sect1><title>Inter Module support</title>
|
||||
<para>
|
||||
Refer to the file kernel/module.c for more information.
|
||||
</para>
|
||||
<!-- FIXME: Removed for now since no structured comments in source
|
||||
X!Ekernel/module.c
|
||||
-->
|
||||
</sect1>
|
||||
</chapter>
|
||||
|
||||
<chapter id="hardware">
|
||||
<title>Hardware Interfaces</title>
|
||||
<sect1><title>Interrupt Handling</title>
|
||||
!Ekernel/irq/manage.c
|
||||
</sect1>
|
||||
|
||||
<sect1><title>DMA Channels</title>
|
||||
!Ekernel/dma.c
|
||||
</sect1>
|
||||
|
||||
<sect1><title>Resources Management</title>
|
||||
!Ikernel/resource.c
|
||||
!Ekernel/resource.c
|
||||
</sect1>
|
||||
|
||||
<sect1><title>MTRR Handling</title>
|
||||
!Earch/x86/kernel/cpu/mtrr/main.c
|
||||
</sect1>
|
||||
|
||||
<sect1><title>PCI Support Library</title>
|
||||
!Edrivers/pci/pci.c
|
||||
!Edrivers/pci/pci-driver.c
|
||||
!Edrivers/pci/remove.c
|
||||
!Edrivers/pci/search.c
|
||||
!Edrivers/pci/msi.c
|
||||
!Edrivers/pci/bus.c
|
||||
!Edrivers/pci/access.c
|
||||
!Edrivers/pci/irq.c
|
||||
!Edrivers/pci/htirq.c
|
||||
<!-- FIXME: Removed for now since no structured comments in source
|
||||
X!Edrivers/pci/hotplug.c
|
||||
-->
|
||||
!Edrivers/pci/probe.c
|
||||
!Edrivers/pci/slot.c
|
||||
!Edrivers/pci/rom.c
|
||||
!Edrivers/pci/iov.c
|
||||
!Idrivers/pci/pci-sysfs.c
|
||||
</sect1>
|
||||
<sect1><title>PCI Hotplug Support Library</title>
|
||||
!Edrivers/pci/hotplug/pci_hotplug_core.c
|
||||
</sect1>
|
||||
</chapter>
|
||||
|
||||
<chapter id="firmware">
|
||||
<title>Firmware Interfaces</title>
|
||||
<sect1><title>DMI Interfaces</title>
|
||||
!Edrivers/firmware/dmi_scan.c
|
||||
</sect1>
|
||||
<sect1><title>EDD Interfaces</title>
|
||||
!Idrivers/firmware/edd.c
|
||||
</sect1>
|
||||
</chapter>
|
||||
|
||||
<chapter id="security">
|
||||
<title>Security Framework</title>
|
||||
!Isecurity/security.c
|
||||
!Esecurity/inode.c
|
||||
</chapter>
|
||||
|
||||
<chapter id="audit">
|
||||
<title>Audit Interfaces</title>
|
||||
!Ekernel/audit.c
|
||||
!Ikernel/auditsc.c
|
||||
!Ikernel/auditfilter.c
|
||||
</chapter>
|
||||
|
||||
<chapter id="accounting">
|
||||
<title>Accounting Framework</title>
|
||||
!Ikernel/acct.c
|
||||
</chapter>
|
||||
|
||||
<chapter id="blkdev">
|
||||
<title>Block Devices</title>
|
||||
!Eblock/blk-core.c
|
||||
!Iblock/blk-core.c
|
||||
!Eblock/blk-map.c
|
||||
!Iblock/blk-sysfs.c
|
||||
!Eblock/blk-settings.c
|
||||
!Eblock/blk-exec.c
|
||||
!Eblock/blk-flush.c
|
||||
!Eblock/blk-lib.c
|
||||
!Eblock/blk-tag.c
|
||||
!Iblock/blk-tag.c
|
||||
!Eblock/blk-integrity.c
|
||||
!Ikernel/trace/blktrace.c
|
||||
!Iblock/genhd.c
|
||||
!Eblock/genhd.c
|
||||
</chapter>
|
||||
|
||||
<chapter id="chrdev">
|
||||
<title>Char devices</title>
|
||||
!Efs/char_dev.c
|
||||
</chapter>
|
||||
|
||||
<chapter id="miscdev">
|
||||
<title>Miscellaneous Devices</title>
|
||||
!Edrivers/char/misc.c
|
||||
</chapter>
|
||||
|
||||
<chapter id="clk">
|
||||
<title>Clock Framework</title>
|
||||
|
||||
<para>
|
||||
The clock framework defines programming interfaces to support
|
||||
software management of the system clock tree.
|
||||
This framework is widely used with System-On-Chip (SOC) platforms
|
||||
to support power management and various devices which may need
|
||||
custom clock rates.
|
||||
Note that these "clocks" don't relate to timekeeping or real
|
||||
time clocks (RTCs), each of which have separate frameworks.
|
||||
These <structname>struct clk</structname> instances may be used
|
||||
to manage for example a 96 MHz signal that is used to shift bits
|
||||
into and out of peripherals or busses, or otherwise trigger
|
||||
synchronous state machine transitions in system hardware.
|
||||
</para>
|
||||
|
||||
<para>
|
||||
Power management is supported by explicit software clock gating:
|
||||
unused clocks are disabled, so the system doesn't waste power
|
||||
changing the state of transistors that aren't in active use.
|
||||
On some systems this may be backed by hardware clock gating,
|
||||
where clocks are gated without being disabled in software.
|
||||
Sections of chips that are powered but not clocked may be able
|
||||
to retain their last state.
|
||||
This low power state is often called a <emphasis>retention
|
||||
mode</emphasis>.
|
||||
This mode still incurs leakage currents, especially with finer
|
||||
circuit geometries, but for CMOS circuits power is mostly used
|
||||
by clocked state changes.
|
||||
</para>
|
||||
|
||||
<para>
|
||||
Power-aware drivers only enable their clocks when the device
|
||||
they manage is in active use. Also, system sleep states often
|
||||
differ according to which clock domains are active: while a
|
||||
"standby" state may allow wakeup from several active domains, a
|
||||
"mem" (suspend-to-RAM) state may require a more wholesale shutdown
|
||||
of clocks derived from higher speed PLLs and oscillators, limiting
|
||||
the number of possible wakeup event sources. A driver's suspend
|
||||
method may need to be aware of system-specific clock constraints
|
||||
on the target sleep state.
|
||||
</para>
|
||||
|
||||
<para>
|
||||
Some platforms support programmable clock generators. These
|
||||
can be used by external chips of various kinds, such as other
|
||||
CPUs, multimedia codecs, and devices with strict requirements
|
||||
for interface clocking.
|
||||
</para>
|
||||
|
||||
!Iinclude/linux/clk.h
|
||||
</chapter>
|
||||
|
||||
</book>
|
@ -11,6 +11,7 @@ Core utilities
|
||||
.. toctree::
|
||||
:maxdepth: 1
|
||||
|
||||
kernel-api
|
||||
assoc_array
|
||||
atomic_ops
|
||||
cpu_hotplug
|
||||
|
419
Documentation/core-api/kernel-api.rst
Normal file
419
Documentation/core-api/kernel-api.rst
Normal file
@ -0,0 +1,419 @@
|
||||
====================
|
||||
The Linux Kernel API
|
||||
====================
|
||||
|
||||
Data Types
|
||||
==========
|
||||
|
||||
Doubly Linked Lists
|
||||
-------------------
|
||||
|
||||
.. kernel-doc:: include/linux/list.h
|
||||
:internal:
|
||||
|
||||
Basic C Library Functions
|
||||
=========================
|
||||
|
||||
When writing drivers, you cannot in general use routines which are from
|
||||
the C Library. Some of the functions have been found generally useful
|
||||
and they are listed below. The behaviour of these functions may vary
|
||||
slightly from those defined by ANSI, and these deviations are noted in
|
||||
the text.
|
||||
|
||||
String Conversions
|
||||
------------------
|
||||
|
||||
.. kernel-doc:: lib/vsprintf.c
|
||||
:export:
|
||||
|
||||
.. kernel-doc:: include/linux/kernel.h
|
||||
:functions: kstrtol
|
||||
|
||||
.. kernel-doc:: include/linux/kernel.h
|
||||
:functions: kstrtoul
|
||||
|
||||
.. kernel-doc:: lib/kstrtox.c
|
||||
:export:
|
||||
|
||||
String Manipulation
|
||||
-------------------
|
||||
|
||||
.. kernel-doc:: lib/string.c
|
||||
:export:
|
||||
|
||||
Bit Operations
|
||||
--------------
|
||||
|
||||
.. kernel-doc:: arch/x86/include/asm/bitops.h
|
||||
:internal:
|
||||
|
||||
Basic Kernel Library Functions
|
||||
==============================
|
||||
|
||||
The Linux kernel provides more basic utility functions.
|
||||
|
||||
Bitmap Operations
|
||||
-----------------
|
||||
|
||||
.. kernel-doc:: lib/bitmap.c
|
||||
:export:
|
||||
|
||||
.. kernel-doc:: lib/bitmap.c
|
||||
:internal:
|
||||
|
||||
Command-line Parsing
|
||||
--------------------
|
||||
|
||||
.. kernel-doc:: lib/cmdline.c
|
||||
:export:
|
||||
|
||||
CRC Functions
|
||||
-------------
|
||||
|
||||
.. kernel-doc:: lib/crc7.c
|
||||
:export:
|
||||
|
||||
.. kernel-doc:: lib/crc16.c
|
||||
:export:
|
||||
|
||||
.. kernel-doc:: lib/crc-itu-t.c
|
||||
:export:
|
||||
|
||||
.. kernel-doc:: lib/crc32.c
|
||||
:export:
|
||||
|
||||
.. kernel-doc:: lib/crc-ccitt.c
|
||||
:export:
|
||||
|
||||
idr/ida Functions
|
||||
-----------------
|
||||
|
||||
.. kernel-doc:: include/linux/idr.h
|
||||
:doc: idr sync
|
||||
|
||||
.. kernel-doc:: lib/idr.c
|
||||
:doc: IDA description
|
||||
|
||||
.. kernel-doc:: lib/idr.c
|
||||
:export:
|
||||
|
||||
Memory Management in Linux
|
||||
==========================
|
||||
|
||||
The Slab Cache
|
||||
--------------
|
||||
|
||||
.. kernel-doc:: include/linux/slab.h
|
||||
:internal:
|
||||
|
||||
.. kernel-doc:: mm/slab.c
|
||||
:export:
|
||||
|
||||
.. kernel-doc:: mm/util.c
|
||||
:export:
|
||||
|
||||
User Space Memory Access
|
||||
------------------------
|
||||
|
||||
.. kernel-doc:: arch/x86/include/asm/uaccess_32.h
|
||||
:internal:
|
||||
|
||||
.. kernel-doc:: arch/x86/lib/usercopy_32.c
|
||||
:export:
|
||||
|
||||
More Memory Management Functions
|
||||
--------------------------------
|
||||
|
||||
.. kernel-doc:: mm/readahead.c
|
||||
:export:
|
||||
|
||||
.. kernel-doc:: mm/filemap.c
|
||||
:export:
|
||||
|
||||
.. kernel-doc:: mm/memory.c
|
||||
:export:
|
||||
|
||||
.. kernel-doc:: mm/vmalloc.c
|
||||
:export:
|
||||
|
||||
.. kernel-doc:: mm/page_alloc.c
|
||||
:internal:
|
||||
|
||||
.. kernel-doc:: mm/mempool.c
|
||||
:export:
|
||||
|
||||
.. kernel-doc:: mm/dmapool.c
|
||||
:export:
|
||||
|
||||
.. kernel-doc:: mm/page-writeback.c
|
||||
:export:
|
||||
|
||||
.. kernel-doc:: mm/truncate.c
|
||||
:export:
|
||||
|
||||
Kernel IPC facilities
|
||||
=====================
|
||||
|
||||
IPC utilities
|
||||
-------------
|
||||
|
||||
.. kernel-doc:: ipc/util.c
|
||||
:internal:
|
||||
|
||||
FIFO Buffer
|
||||
===========
|
||||
|
||||
kfifo interface
|
||||
---------------
|
||||
|
||||
.. kernel-doc:: include/linux/kfifo.h
|
||||
:internal:
|
||||
|
||||
relay interface support
|
||||
=======================
|
||||
|
||||
Relay interface support is designed to provide an efficient mechanism
|
||||
for tools and facilities to relay large amounts of data from kernel
|
||||
space to user space.
|
||||
|
||||
relay interface
|
||||
---------------
|
||||
|
||||
.. kernel-doc:: kernel/relay.c
|
||||
:export:
|
||||
|
||||
.. kernel-doc:: kernel/relay.c
|
||||
:internal:
|
||||
|
||||
Module Support
|
||||
==============
|
||||
|
||||
Module Loading
|
||||
--------------
|
||||
|
||||
.. kernel-doc:: kernel/kmod.c
|
||||
:export:
|
||||
|
||||
Inter Module support
|
||||
--------------------
|
||||
|
||||
Refer to the file kernel/module.c for more information.
|
||||
|
||||
Hardware Interfaces
|
||||
===================
|
||||
|
||||
Interrupt Handling
|
||||
------------------
|
||||
|
||||
.. kernel-doc:: kernel/irq/manage.c
|
||||
:export:
|
||||
|
||||
DMA Channels
|
||||
------------
|
||||
|
||||
.. kernel-doc:: kernel/dma.c
|
||||
:export:
|
||||
|
||||
Resources Management
|
||||
--------------------
|
||||
|
||||
.. kernel-doc:: kernel/resource.c
|
||||
:internal:
|
||||
|
||||
.. kernel-doc:: kernel/resource.c
|
||||
:export:
|
||||
|
||||
MTRR Handling
|
||||
-------------
|
||||
|
||||
.. kernel-doc:: arch/x86/kernel/cpu/mtrr/main.c
|
||||
:export:
|
||||
|
||||
PCI Support Library
|
||||
-------------------
|
||||
|
||||
.. kernel-doc:: drivers/pci/pci.c
|
||||
:export:
|
||||
|
||||
.. kernel-doc:: drivers/pci/pci-driver.c
|
||||
:export:
|
||||
|
||||
.. kernel-doc:: drivers/pci/remove.c
|
||||
:export:
|
||||
|
||||
.. kernel-doc:: drivers/pci/search.c
|
||||
:export:
|
||||
|
||||
.. kernel-doc:: drivers/pci/msi.c
|
||||
:export:
|
||||
|
||||
.. kernel-doc:: drivers/pci/bus.c
|
||||
:export:
|
||||
|
||||
.. kernel-doc:: drivers/pci/access.c
|
||||
:export:
|
||||
|
||||
.. kernel-doc:: drivers/pci/irq.c
|
||||
:export:
|
||||
|
||||
.. kernel-doc:: drivers/pci/htirq.c
|
||||
:export:
|
||||
|
||||
.. kernel-doc:: drivers/pci/probe.c
|
||||
:export:
|
||||
|
||||
.. kernel-doc:: drivers/pci/slot.c
|
||||
:export:
|
||||
|
||||
.. kernel-doc:: drivers/pci/rom.c
|
||||
:export:
|
||||
|
||||
.. kernel-doc:: drivers/pci/iov.c
|
||||
:export:
|
||||
|
||||
.. kernel-doc:: drivers/pci/pci-sysfs.c
|
||||
:internal:
|
||||
|
||||
PCI Hotplug Support Library
|
||||
---------------------------
|
||||
|
||||
.. kernel-doc:: drivers/pci/hotplug/pci_hotplug_core.c
|
||||
:export:
|
||||
|
||||
Firmware Interfaces
|
||||
===================
|
||||
|
||||
DMI Interfaces
|
||||
--------------
|
||||
|
||||
.. kernel-doc:: drivers/firmware/dmi_scan.c
|
||||
:export:
|
||||
|
||||
EDD Interfaces
|
||||
--------------
|
||||
|
||||
.. kernel-doc:: drivers/firmware/edd.c
|
||||
:internal:
|
||||
|
||||
Security Framework
|
||||
==================
|
||||
|
||||
.. kernel-doc:: security/security.c
|
||||
:internal:
|
||||
|
||||
.. kernel-doc:: security/inode.c
|
||||
:export:
|
||||
|
||||
Audit Interfaces
|
||||
================
|
||||
|
||||
.. kernel-doc:: kernel/audit.c
|
||||
:export:
|
||||
|
||||
.. kernel-doc:: kernel/auditsc.c
|
||||
:internal:
|
||||
|
||||
.. kernel-doc:: kernel/auditfilter.c
|
||||
:internal:
|
||||
|
||||
Accounting Framework
|
||||
====================
|
||||
|
||||
.. kernel-doc:: kernel/acct.c
|
||||
:internal:
|
||||
|
||||
Block Devices
|
||||
=============
|
||||
|
||||
.. kernel-doc:: block/blk-core.c
|
||||
:export:
|
||||
|
||||
.. kernel-doc:: block/blk-core.c
|
||||
:internal:
|
||||
|
||||
.. kernel-doc:: block/blk-map.c
|
||||
:export:
|
||||
|
||||
.. kernel-doc:: block/blk-sysfs.c
|
||||
:internal:
|
||||
|
||||
.. kernel-doc:: block/blk-settings.c
|
||||
:export:
|
||||
|
||||
.. kernel-doc:: block/blk-exec.c
|
||||
:export:
|
||||
|
||||
.. kernel-doc:: block/blk-flush.c
|
||||
:export:
|
||||
|
||||
.. kernel-doc:: block/blk-lib.c
|
||||
:export:
|
||||
|
||||
.. kernel-doc:: block/blk-tag.c
|
||||
:export:
|
||||
|
||||
.. kernel-doc:: block/blk-tag.c
|
||||
:internal:
|
||||
|
||||
.. kernel-doc:: block/blk-integrity.c
|
||||
:export:
|
||||
|
||||
.. kernel-doc:: kernel/trace/blktrace.c
|
||||
:internal:
|
||||
|
||||
.. kernel-doc:: block/genhd.c
|
||||
:internal:
|
||||
|
||||
.. kernel-doc:: block/genhd.c
|
||||
:export:
|
||||
|
||||
Char devices
|
||||
============
|
||||
|
||||
.. kernel-doc:: fs/char_dev.c
|
||||
:export:
|
||||
|
||||
Miscellaneous Devices
|
||||
=====================
|
||||
|
||||
.. kernel-doc:: drivers/char/misc.c
|
||||
:export:
|
||||
|
||||
Clock Framework
|
||||
===============
|
||||
|
||||
The clock framework defines programming interfaces to support software
|
||||
management of the system clock tree. This framework is widely used with
|
||||
System-On-Chip (SOC) platforms to support power management and various
|
||||
devices which may need custom clock rates. Note that these "clocks"
|
||||
don't relate to timekeeping or real time clocks (RTCs), each of which
|
||||
have separate frameworks. These :c:type:`struct clk <clk>`
|
||||
instances may be used to manage for example a 96 MHz signal that is used
|
||||
to shift bits into and out of peripherals or busses, or otherwise
|
||||
trigger synchronous state machine transitions in system hardware.
|
||||
|
||||
Power management is supported by explicit software clock gating: unused
|
||||
clocks are disabled, so the system doesn't waste power changing the
|
||||
state of transistors that aren't in active use. On some systems this may
|
||||
be backed by hardware clock gating, where clocks are gated without being
|
||||
disabled in software. Sections of chips that are powered but not clocked
|
||||
may be able to retain their last state. This low power state is often
|
||||
called a *retention mode*. This mode still incurs leakage currents,
|
||||
especially with finer circuit geometries, but for CMOS circuits power is
|
||||
mostly used by clocked state changes.
|
||||
|
||||
Power-aware drivers only enable their clocks when the device they manage
|
||||
is in active use. Also, system sleep states often differ according to
|
||||
which clock domains are active: while a "standby" state may allow wakeup
|
||||
from several active domains, a "mem" (suspend-to-RAM) state may require
|
||||
a more wholesale shutdown of clocks derived from higher speed PLLs and
|
||||
oscillators, limiting the number of possible wakeup event sources. A
|
||||
driver's suspend method may need to be aware of system-specific clock
|
||||
constraints on the target sleep state.
|
||||
|
||||
Some platforms support programmable clock generators. These can be used
|
||||
by external chips of various kinds, such as other CPUs, multimedia
|
||||
codecs, and devices with strict requirements for interface clocking.
|
||||
|
||||
.. kernel-doc:: include/linux/clk.h
|
||||
:internal:
|
Loading…
Reference in New Issue
Block a user