linux-toradex.git/drivers/dma/at_hdmac.c, branch v3.11

dmaengine: at_hdmac: prepare clk before calling enable

2013-07-05T06:10:57+00:00

Replace clk_enable/disable with clk_prepare_enable/disable_unprepare to
avoid common clk framework warnings.

Signed-off-by: Boris BREZILLON 
[nicolas.ferre@atmel.com: remove return code checking in at_dma_resume_noirq()]
Signed-off-by: Nicolas Ferre

dmaengine/trivial: at_hdmac: add curly brackets to if/else expressions

2013-07-05T06:10:56+00:00

Correct coding style following the patch:
7c407d3e54dcc0c79119553c8d5ef176c1d5bc3a (DMA: AT91:
Get residual bytes in dma buffer).

Signed-off-by: Nicolas Ferre

dmaengine: at_hdmac: remove unsuded atc_cleanup_descriptors()

2013-07-05T06:10:55+00:00

Since patch 7c407d3e54dcc0c79119553c8d5ef176c1d5bc3a (DMA: AT91:
Get residual bytes in dma buffer), the function
atc_cleanup_descriptors() is not used anymore. We remove it to prevent
warnings.

Reported-by: Arnd Bergmann 
Signed-off-by: Nicolas Ferre 
Acked-by: Arnd Bergmann

dmaengine: at_hdmac: add FIFO configuration parameter to DMA DT binding

2013-07-05T06:10:54+00:00

For most devices the FIFO configuration is the same i.e. when half FIFO size is
available/filled, a source/destination request is serviced. But USART devices
have to do it when there is enough space/data available to perform a single
AHB access so the ASAP configuration.

Acked-by: Nicolas Ferre 
Acked-by: Jean-Christophe PLAGNIOL-VILLARD 
Signed-off-by: Ludovic Desroches 
Signed-off-by: Nicolas Ferre

dma: at_hdmac: remove unnecessary platform_set_drvdata()

2013-07-05T06:10:34+00:00

The driver core clears the driver data to NULL after device_release
or on probe failure, since commit 0998d0631001288a5974afc0b2a5f568bcdecb4d
(device-core: Ensure drvdata = NULL when no driver is bound).
Thus, it is not needed to manually clear the device driver data to NULL.

Signed-off-by: Jingoo Han 
Acked-by: Nicolas Ferre 
Signed-off-by: Vinod Koul

DMA: AT91: Get residual bytes in dma buffer

2013-07-05T06:10:31+00:00

Add support for returning the residue for current transfer cookie by
reading the transfered buffer size(BTSIZE) in CTRLA register.

For a single buffer cookie, the descriptor length minus BTSIZE
can get the residue.

For a lli cookie, remain_desc will record remain descriptor length
when last descriptor finish, the remain_desc minus BTSIZE can get the
current residue.

If the cookie has completed successfully, the residue will be zero.
If the cookie is in progress, it will be the number of bytes yet to be transferred.
If get residue error, the cookie will be turn into error status.

Check dma fifo to see if data remain, let issue pending finish remain work if there is.
Signed-off-by: Elen Song 
Signed-off-by: Vinod Koul

DMA: AT91: Get transfer width

2013-07-05T06:10:30+00:00

In one dma transfer, the data transfer width can be configured and it is limited by source or destination peripheral width,
tx_width will save the transfer width, but for memcpy, either source or destination transfer width is taken as tx_width.

Signed-off-by: Elen Song 
Signed-off-by: Vinod Koul

dmaengine: at_hdmac/trivial: rearrange CFG register bits assignment

2013-07-05T06:10:29+00:00

No modification in CFG register configuration, just rearrange
bits directives to group logically and make it more readable.

Signed-off-by: Nicolas Ferre 
Acked-by: Jean-Christophe PLAGNIOL-VILLARD 
Signed-off-by: Vinod Koul

dmaengine: at_hdmac: extend hardware handshaking interface identification

2013-07-05T06:10:29+00:00

Peripheral handshaking identification numbers can be bigger than 15, so new
fields have been created in the CFG register.
Add macros to take this modification into account and use them in
at_dma_xlate() function.

Signed-off-by: Nicolas Ferre 
Acked-by: Jean-Christophe PLAGNIOL-VILLARD 
Signed-off-by: Vinod Koul

dmaengine: at_hdmac/trivial: correct typo in comment

2013-07-05T06:10:28+00:00

Signed-off-by: Nicolas Ferre 
Acked-by: Jean-Christophe PLAGNIOL-VILLARD 
Signed-off-by: Vinod Koul