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DMAENGINE: generic slave control v2

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Convert the device_terminate_all() operation on the
DMA engine to a generic device_control() operation
which can now optionally support also pausing and
resuming DMA on a certain channel. Implemented for the
COH 901 318 DMAC as an example.

[dan.j.williams@intel.com: update for timberdale]
Signed-off-by: Linus Walleij <linus.walleij@stericsson.com>
Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Cc: Maciej Sosnowski <maciej.sosnowski@intel.com>
Cc: Nicolas Ferre <nicolas.ferre@atmel.com>
Cc: Pavel Machek <pavel@ucw.cz>
Cc: Li Yang <leoli@freescale.com>
Cc: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Cc: Paul Mundt <lethal@linux-sh.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>
Cc: Magnus Damm <damm@opensource.se>
Cc: Liam Girdwood <lrg@slimlogic.co.uk>
Cc: Joe Perches <joe@perches.com>
Cc: Roland Dreier <rdreier@cisco.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Linus Walleij
2010-03-26 16:44:01 -07:00
committed by Dan Williams
parent 0f65169b1b
commit c3635c78e5
15 changed files with 117 additions and 57 deletions
Download Patch File Download Diff File Expand all files Collapse all files

18
include/linux/dmaengine.h
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@@ -106,6 +106,19 @@ enum dma_ctrl_flags {
DMA_PREP_FENCE = (1 << 9),
};
/**
* enum dma_ctrl_cmd - DMA operations that can optionally be exercised
* on a running channel.
* @DMA_TERMINATE_ALL: terminate all ongoing transfers
* @DMA_PAUSE: pause ongoing transfers
* @DMA_RESUME: resume paused transfer
*/
enum dma_ctrl_cmd {
DMA_TERMINATE_ALL,
DMA_PAUSE,
DMA_RESUME,
};
/**
* enum sum_check_bits - bit position of pq_check_flags
*/
@@ -261,7 +274,8 @@ struct dma_async_tx_descriptor {
* @device_prep_dma_memset: prepares a memset operation
* @device_prep_dma_interrupt: prepares an end of chain interrupt operation
* @device_prep_slave_sg: prepares a slave dma operation
* @device_terminate_all: terminate all pending operations
* @device_control: manipulate all pending operations on a channel, returns
* zero or error code
* @device_is_tx_complete: poll for transaction completion
* @device_issue_pending: push pending transactions to hardware
*/
@@ -313,7 +327,7 @@ struct dma_device {
struct dma_chan *chan, struct scatterlist *sgl,
unsigned int sg_len, enum dma_data_direction direction,
unsigned long flags);
void (*device_terminate_all)(struct dma_chan *chan);
int (*device_control)(struct dma_chan *chan, enum dma_ctrl_cmd cmd);
enum dma_status (*device_is_tx_complete)(struct dma_chan *chan,
dma_cookie_t cookie, dma_cookie_t *last,