linux/Documentation
Andy Shevchenko 1b2e98bc1e dma: acpi-dma: introduce ACPI DMA helpers
There is a new generic API to get a DMA channel for a slave device (commit
9a6cecc8 "dmaengine: add helper function to request a slave DMA channel"). In
similar fashion to the DT case (commit aa3da644 "of: Add generic device tree
DMA helpers") we introduce helpers to the DMAC drivers which are enumerated by
ACPI.

The proposed extension provides the following API calls:
	acpi_dma_controller_register(), devm_acpi_dma_controller_register()
	acpi_dma_controller_free(), devm_acpi_dma_controller_free()
	acpi_dma_simple_xlate()
	acpi_dma_request_slave_chan_by_index()
	acpi_dma_request_slave_chan_by_name()

The first two should be used, for example, at probe() and remove() of the
corresponding DMAC driver. At the register stage the DMAC driver supplies a
custom xlate() function to translate a struct dma_spec into struct dma_chan.

Accordingly to the ACPI Fixed DMA resource specification the only two pieces of
information the slave device has are the channel id and the request line (slave
id). Those two are represented by struct dma_spec. The
acpi_dma_request_slave_chan_by_index() provides access to the specifix FixedDMA
resource by its index. Whereas dma_request_slave_channel() takes a string
parameter to identify the DMA resources required by the slave device. To make a
slave device driver work with both DeviceTree and ACPI enumeration a simple
convention is established: "tx" corresponds to the index 0 and "rx" to the
index 1. In case of robust configuration the slave device driver unfortunately
needs to call acpi_dma_request_slave_chan_by_index() directly.

Additionally the patch provides "managed" version of the register/free pair
i.e. devm_acpi_dma_controller_register() and devm_acpi_dma_controller_free().
Usually, the driver uses only devm_acpi_dma_controller_register().

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
2013-04-15 22:04:10 +05:30
..
ABI Merge branch 'for_linus' of git://cavan.codon.org.uk/platform-drivers-x86 2013-03-03 10:16:19 -08:00
DocBook tty: Documentation: fix a path in a DocBook template 2013-04-03 11:45:38 -07:00
EDID drm: Load EDID: Explain better how to write your own EDID firmware 2013-01-20 19:22:19 +10:00
PCI PCI/MSI: Enable multiple MSIs with pci_enable_msi_block_auto() 2013-01-24 17:25:13 +01:00
RCU Merge branches 'urgent.2012.10.27a', 'doc.2012.11.16a', 'fixes.2012.11.13a', 'srcu.2012.10.27a', 'stall.2012.11.13a', 'tracing.2012.11.08a' and 'idle.2012.10.24a' into HEAD 2012-11-16 09:59:58 -08:00
accounting doc: Remove unnecessary declarations from Documentation/accounting/getdelays.c 2012-11-26 14:22:21 +01:00
acpi dma: acpi-dma: introduce ACPI DMA helpers 2013-04-15 22:04:10 +05:30
aoe aoe: allow user to disable target failure timeout 2012-12-17 17:15:25 -08:00
arm fbdev changes for 3.8: 2012-12-15 13:03:48 -08:00
arm64 arm64: Add simple earlyprintk support 2013-01-22 17:51:01 +00:00
auxdisplay
backlight backlight: lp855x_bl: support new LP8557 device 2013-02-21 17:22:25 -08:00
blackfin Documentation: Fix typo in multiple files in Documentation 2012-04-16 14:37:13 +02:00
block cfq-iosched: enable full blkcg hierarchy support 2013-01-09 08:05:11 -08:00
blockdev nbd: update documentation and link to mailinglist 2013-02-27 19:10:22 -08:00
bus-devices ARM: OMAP2+: gpmc: generic timing calculation 2012-11-09 18:07:11 +05:30
cdrom
cgroups Merge branch 'for-3.9/core' of git://git.kernel.dk/linux-block 2013-02-28 12:52:24 -08:00
connector connector: Move cn_test.c away from NLMSG_PUT(). 2012-06-26 21:19:02 -07:00
console
cpu-freq cpufreq: Update Documentation for cpus and related_cpus 2013-02-02 00:01:16 +01:00
cpuidle Honor state disabling in the cpuidle ladder governor 2012-09-04 01:35:44 +02:00
cris CRIS: Update documentation 2012-04-03 13:09:18 +02:00
crypto KEYS: Document asymmetric key type 2012-10-08 13:50:12 +10:30
development-process Documentation: Update stable address 2011-12-12 14:14:31 -08:00
device-mapper md updates for 3.9 2013-03-05 17:22:08 -08:00
devicetree This is the first batch of MFD fixes for 3.9. 2013-03-15 17:34:01 -07:00
driver-model lib: devres: Introduce devm_ioremap_resource() 2013-01-22 09:41:43 -08:00
dvb [media] get_dvb_firmware: Fix the location of firmware for Terratec HTC 2013-01-01 11:18:26 -02:00
early-userspace
extcon Documentation/extcon: porting guide for Android kernel switch driver. 2012-04-20 09:24:27 -07:00
fault-injection doc: fix quite a few typos within Documentation 2012-11-19 14:28:24 +01:00
fb Documentation: remove references to /etc/modprobe.conf 2012-03-30 16:03:15 -07:00
filesystems Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2013-02-26 20:16:07 -08:00
firmware_class firmware loader: document firmware cache mechanism 2012-11-14 15:07:18 -08:00
frv
hid HID: remove x bit from sensor doc 2012-12-14 08:48:59 +01:00
hwmon hwmon: (lm75) Fix tcn75 prefix 2013-03-18 21:19:49 +01:00
i2c i2c: Fix my e-mail address in drivers and documentation 2013-03-22 11:18:34 +01:00
i2o Documentation: Fix multiple typo in Documentation 2012-03-07 16:08:24 +01:00
ia64 doc: aliasing-test: close fd on write error 2012-09-01 09:57:10 -07:00
ide Documentation: remove references to /etc/modprobe.conf 2012-03-30 16:03:15 -07:00
infiniband IB/ipoib: Add rtnl_link_ops support 2012-09-20 16:49:17 -04:00
input Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input 2013-03-11 07:49:37 -07:00
ioctl wanrouter: completely decouple obsolete code from kernel. 2013-01-31 19:20:33 -05:00
isdn Documentation: remove references to /etc/modprobe.conf 2012-03-30 16:03:15 -07:00
ja_JP
kbuild Merge branch 'kconfig' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild 2013-02-27 12:28:30 -08:00
kdump kexec: update URL of kexec homepage 2012-07-18 18:35:57 -07:00
ko_KR driver-core: documentation: fix up Greg's email address 2012-02-15 14:48:01 -08:00
laptops Documentation/laptops: remove depends on CONFIG_EXPERIMENTAL 2013-01-21 14:52:42 -08:00
leds Documentation: leds: update LP55xx family devices 2013-02-06 15:59:30 -08:00
m68k
make
memory-devices memory: emif: add basic infrastructure for EMIF driver 2012-05-02 00:10:49 -07:00
metag metag: Basic documentation 2013-03-02 20:09:50 +00:00
mips
misc-devices doc: fix quite a few typos within Documentation 2012-11-19 14:28:24 +01:00
mmc mmc: core: Extend sysfs to ext_csd parameters for RPMB support 2012-12-06 13:54:48 -05:00
mn10300
mtd
namespaces userns: Recommend use of memory control groups. 2013-01-26 22:20:06 -08:00
netlabel
networking ipvs: add backup_only flag to avoid loops 2013-03-19 21:21:51 +09:00
nfc NFC: Update pn544 documentation 2013-01-10 01:27:46 +01:00
parisc Documentation: Fix typo in multiple files in Documentation 2012-04-16 14:37:13 +02:00
pcmcia
power PM / OPP: improve introductory documentation 2013-03-04 14:23:11 +01:00
powerpc powerpc: Documentation for transactional memory on powerpc 2013-02-15 17:02:25 +11:00
pps
prctl seccomp: Make syscall skipping and nr changes more consistent 2012-10-02 21:14:29 +10:00
pti
ptp
rapidio RapidIO: documentation update 2011-11-02 16:07:02 -07:00
s390 Documentation: remove references to /etc/modprobe.conf 2012-03-30 16:03:15 -07:00
scheduler sched: Remove __ARCH_WANT_INTERRUPTS_ON_CTXSW 2012-09-13 16:52:04 +02:00
scsi [SCSI] qla2xxx: Update copyright dates information in LICENSE.qla2xxx file. 2013-04-06 11:31:30 +01:00
security Documentation: fix Documentation/security/00-INDEX 2012-12-17 17:15:22 -08:00
serial tty: Update serial core API documentation 2013-01-15 21:57:44 -08:00
sh
sound Revert "ALSA: hda - Allow power_save_controller option override DCAPS" 2013-04-04 15:35:39 +02:00
spi Documentation: remove __dev* attributes. 2013-01-03 15:57:16 -08:00
sysctl Documentation/sysctl/kernel.txt: document /proc/sys/shmall 2013-01-04 16:11:46 -08:00
target target: Simplify fabric sense data length handling 2012-09-17 17:12:58 -07:00
thermal Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/rzhang/linux 2013-02-28 19:48:26 -08:00
timers
trace Merge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2013-03-11 07:54:29 -07:00
usb USB: report submission of active URBs 2012-11-11 18:10:46 -08:00
vDSO
video4linux [media] radio-si470x doc: add info about v4l2-ctl and sox+alsa 2013-02-13 17:33:20 -02:00
virtual Merge tag 'kvm-3.9-1' of git://git.kernel.org/pub/scm/virt/kvm/kvm 2013-02-24 13:07:18 -08:00
vm ksm: add some comments 2013-02-23 17:50:23 -08:00
w1 w1: w1_therm: Add force-pullup option for "broken" sensors 2013-02-18 13:55:24 -08:00
watchdog watchdog: core: dt: add support for the timeout-sec dt property 2013-03-01 12:48:36 +01:00
wimax
x86 Merge branch 'x86/microcode' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2013-02-22 19:22:52 -08:00
xtensa xtensa: initialize atomctl SR 2012-12-18 21:10:22 -08:00
zh_CN Driver core patches for 3.9-rc1 2013-02-21 12:05:51 -08:00
.gitignore
00-INDEX ImgTec Meta architecture changes for v3.9-rc1 2013-03-03 12:06:09 -08:00
BUG-HUNTING
Changes
CodingStyle Documentation: remove depends on CONFIG_EXPERIMENTAL 2013-01-11 11:38:03 -08:00
DMA-API-HOWTO.txt Documentation/DMA-API-HOWTO.txt: fix typo 2013-02-27 19:10:23 -08:00
DMA-API.txt dma-debug: New interfaces to debug dma mapping errors 2012-10-24 17:06:43 +02:00
DMA-ISA-LPC.txt
DMA-attributes.txt common: DMA-mapping: add DMA_ATTR_FORCE_CONTIGUOUS attribute 2012-11-29 03:30:34 -08:00
HOWTO HOWTO: fix double words typo 2012-12-10 15:54:27 +01:00
IPMI.txt ipmi: add options to disable openfirmware and PCI scanning 2013-02-27 19:10:21 -08:00
IRQ-affinity.txt
IRQ-domain.txt irqdomain: update documentation 2012-12-05 23:52:10 +00:00
IRQ.txt
Intel-IOMMU.txt
Makefile mei: move doc files Documentation/misc-devices/mei 2012-05-09 13:59:09 -07:00
ManagementStyle Documentation: ManagementStyle: fixed typo 2012-06-28 12:03:15 +02:00
SAK.txt
SM501.txt
SecurityBugs
SubmitChecklist
SubmittingDrivers
SubmittingPatches Randy has moved 2013-03-08 15:05:34 -08:00
VGA-softcursor.txt
applying-patches.txt
atomic_ops.txt Documentation: Memory barrier semantics of atomic_xchg() 2013-01-08 14:14:55 -08:00
bad_memory.txt
basic_profiling.txt
binfmt_misc.txt
braille-console.txt
bt8xxgpio.txt
btmrvl.txt
bus-virt-phys-mapping.txt
cachetlb.txt
circular-buffers.txt
clk.txt Documentation: common clk API 2012-03-16 20:35:01 +00:00
coccinelle.txt coccicheck: Allow the user to give a V= (verbose) argument 2013-02-22 11:39:13 +01:00
cpu-hotplug.txt doc: Add x86 CPU0 online/offline feature 2012-11-14 09:39:44 -08:00
cpu-load.txt
cputopology.txt
crc32.txt crc32: move long comment about crc32 fundamentals to Documentation/ 2012-03-23 16:58:37 -07:00
dcdbas.txt
debugging-modules.txt
debugging-via-ohci1394.txt
dell_rbu.txt
devices.txt firmware: remove last vestiges of dabusb 2012-11-21 13:03:01 -08:00
digsig.txt crypto: digital signature verification support 2011-11-09 12:10:37 +02:00
dma-buf-sharing.txt dma-buf: implement vmap refcounting in the interface logic 2013-02-27 15:13:36 +05:30
dmaengine.txt Documentation: Fix multiple typo in Documentation 2012-03-07 16:08:24 +01:00
dmatest.txt dmatest: append verify result to results 2013-04-15 09:51:18 +05:30
dontdiff x86: remove offsets.h from .gitignore and dontdiff 2012-11-19 14:10:53 +01:00
dynamic-debug-howto.txt dynamic_debug: dynamic hex dump 2013-01-17 12:19:09 -08:00
edac.txt Merge branch 'devel' 2012-07-29 21:11:05 -03:00
eisa.txt MCA: delete all remaining traces of microchannel bus support. 2012-05-17 19:06:13 -04:00
email-clients.txt
flexible-arrays.txt
futex-requeue-pi.txt
gcov.txt
gpio.txt gpiolib: provide provision to register pin ranges 2012-11-11 19:06:00 +01:00
highuid.txt
hw_random.txt
hwspinlock.txt
init.txt
initrd.txt Documentation/initrd.txt: Change the location of util-linux 2012-05-25 16:18:34 +02:00
intel_txt.txt Documentation: remove depends on CONFIG_EXPERIMENTAL 2013-01-11 11:38:03 -08:00
io-mapping.txt
io_ordering.txt
iostats.txt
irqflags-tracing.txt
isapnp.txt
java.txt
kernel-doc-nano-HOWTO.txt Kernel-doc: Convention: Use a "Return" section to describe return values 2012-11-27 21:08:57 +01:00
kernel-docs.txt
kernel-parameters.txt ImgTec Meta architecture changes for v3.9-rc1 2013-03-03 12:06:09 -08:00
kmemcheck.txt
kmemleak.txt kmemleak: Handle percpu memory allocation 2011-12-02 16:12:42 +00:00
kobject.txt Documentation: Fix "struct kobj_type" to include newer members. 2012-09-04 16:06:34 -07:00
kprobes.txt
kref.txt kref: Add kref_get_unless_zero documentation 2012-11-28 18:36:06 +10:00
ldm.txt
local_ops.txt
lockdep-design.txt lockdep: Update documentation for lock-class leak detection 2011-12-11 10:31:23 -08:00
lockstat.txt locking/stat: Fix a typo 2013-02-19 08:42:37 +01:00
lockup-watchdogs.txt watchdog: Update documentation 2012-02-11 15:11:28 +01:00
logo.gif
logo.txt
magic-number.txt wanrouter: completely decouple obsolete code from kernel. 2013-01-31 19:20:33 -05:00
md.txt md: create externally visible flags for supporting hot-replace. 2011-12-23 10:17:51 +11:00
media-framework.txt [media] Documentation/media-framework.txt: fix a sentence 2013-02-08 13:27:13 -02:00
memory-barriers.txt Documentation: Memory barrier semantics of atomic_xchg() 2013-01-08 14:14:55 -08:00
memory-hotplug.txt hotplug: update nodemasks management 2012-12-12 17:38:33 -08:00
mono.txt Documentation: remove references to /etc/modprobe.conf 2012-03-30 16:03:15 -07:00
mutex-design.txt
nommu-mmap.txt
numastat.txt Doc: Update numastat.txt 2012-02-28 16:05:06 +01:00
oops-tracing.txt module,bug: Add TAINT_OOT_MODULE flag for modules not built in-tree 2011-11-07 07:54:42 +10:30
padata.txt
parport-lowlevel.txt
parport.txt Documentation: remove references to /etc/modprobe.conf 2012-03-30 16:03:15 -07:00
percpu-rw-semaphore.txt percpu-rw-semaphore: fix documentation typos 2012-09-26 19:56:15 +02:00
pi-futex.txt
pinctrl.txt drivers/pinctrl: grab default handles from device core 2013-01-23 16:39:51 +01:00
pnp.txt
preempt-locking.txt
printk-formats.txt Randy has moved 2013-03-08 15:05:34 -08:00
pwm.txt pwm: add devm_pwm_get() and devm_pwm_put() 2012-09-10 17:05:45 +02:00
ramoops.txt pstore/ftrace: Convert to its own enable/disable debugfs knob 2012-09-06 22:16:58 -07:00
rbtree.txt rbtree: move augmented rbtree functionality to rbtree_augmented.h 2012-10-09 16:22:40 +09:00
remoteproc.txt remoteproc: add rproc_report_crash function to notify rproc crashes 2012-09-18 12:53:22 +03:00
rfkill.txt
robust-futex-ABI.txt
robust-futexes.txt
rpmsg.txt Documentation: remove __dev* attributes. 2013-01-03 15:57:16 -08:00
rt-mutex-design.txt
rt-mutex.txt
rtc.txt rtc-proc: permit the /proc/driver/rtc device to use other devices 2012-10-06 03:05:01 +09:00
serial-console.txt
sgi-ioc4.txt
sgi-visws.txt
smsc_ece1099.txt mfd: smsc: Add support for smsc gpio io/keypad driver 2012-10-01 15:27:48 +02:00
sparse.txt Documentation/sparse.txt: document context annotations for lock checking 2012-12-17 17:15:23 -08:00
spinlocks.txt
stable_api_nonsense.txt
stable_kernel_rules.txt stable: Allow merging of backports for serious user-visible performance issues 2012-06-25 12:11:58 -07:00
static-keys.txt Documentation: Fix typo in multiple files in Documentation 2012-04-16 14:37:13 +02:00
svga.txt
sysfs-rules.txt
sysrq.txt sparc64: Add global PMU register dumping via sysrq. 2012-10-16 09:34:01 -07:00
unaligned-memory-access.txt
unicode.txt
unshare.txt
vfio.txt vfio: Trivial Documentation correction 2012-09-21 10:48:03 -06:00
vgaarbiter.txt misc latin1 to utf8 conversions 2012-01-02 13:04:55 +01:00
video-output.txt
vme_api.txt VME: Move API documentation to Documentation folder 2012-05-08 16:01:34 -07:00
volatile-considered-harmful.txt
workqueue.txt workqueue: reimplement WQ_HIGHPRI using a separate worker_pool 2012-07-13 22:24:45 -07:00
xz.txt
zorro.txt