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
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acpi	Fixes:	2013-03-12 20:25:53 -07:00
asm-generic	x86-32: Fix possible incomplete TLB invalidate with PAE pagetables	2013-04-12 16:56:47 -07:00
clocksource	ImgTec Meta architecture changes for v3.9-rc1	2013-03-03 12:06:09 -08:00
crypto
drm	drm/radeon: add Richland pci ids	2013-03-15 18:47:19 -04:00
keys
linux	dma: acpi-dma: introduce ACPI DMA helpers	2013-04-15 22:04:10 +05:30
math-emu
media
memory
misc
net	af_iucv: fix recvmsg by replacing skb_pull() function	2013-04-08 17:16:57 -04:00
pcmcia
ras
rdma
rxrpc
scsi	libfc, fcoe, bnx2fc: Split fc_disc_init into fc_disc_{init, config}	2013-03-25 16:03:03 -07:00
sound	Merge remote-tracking branch 'asoc/fix/max98090' into asoc-next	2013-03-26 14:08:03 +00:00
target
trace	Various bug fixes for ext4. The most important is a fix for the new	2013-03-02 19:33:21 -08:00
uapi	net: fix *_DIAG_MAX constants	2013-03-21 12:36:33 -04:00
video	ARM: at91: fix LCD-wiring mode	2013-03-13 11:05:04 +01:00
xen	for-linus-20130331	2013-03-31 11:38:59 -07:00
Kbuild