linux-toradex.git/drivers/dma/virt-dma.c, branch v3.14.4 Linux kernel for Apalis and Colibri modules dmaengine: virt-dma: add support for cyclic DMA periodic callbacks 2012-07-01T13:15:23+00:00 Russell King rmk+kernel@arm.linux.org.uk 2012-05-14T14:17:20+00:00 571fa74034701391b1be2ad193f684acfdeb75d1 Add support for cyclic DMA's periodic callbacks. Drivers are expected to call vchan_cyclic_callback() when a period has completed, which will schedule the tasklet to make the callback into the driver. As callbacks are made from tasklet context, it is important to realise that we don't guarantee a callback for each completed period, but for N completed periods where N may be greater than one. Tested-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> 
Add support for cyclic DMA's periodic callbacks.  Drivers are expected
to call vchan_cyclic_callback() when a period has completed, which will
schedule the tasklet to make the callback into the driver.

As callbacks are made from tasklet context, it is important to realise
that we don't guarantee a callback for each completed period, but for
N completed periods where N may be greater than one.

Tested-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
dmaengine: virt-dma: vchan_find_desc() 2012-07-01T13:15:22+00:00 Russell King rmk+kernel@arm.linux.org.uk 2012-05-10T22:39:27+00:00 fe045874aaf4480386c65baf1acae82af4c5e21f Add a function to find a descriptor within the depths of the virtualized DMA channel support. Needed for tx_status functionality. Tested-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> 
Add a function to find a descriptor within the depths of the
virtualized DMA channel support.  Needed for tx_status functionality.

Tested-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
dmaengine: split out virtual channel DMA support from sa11x0 driver 2012-07-01T13:15:21+00:00 Russell King rmk+kernel@arm.linux.org.uk 2012-04-13T11:07:23+00:00 50437bff7f7374f86837986f66e15e73a364f894 Split the virtual slave channel DMA support from the sa11x0 driver so this code can be shared with other slave DMA engine drivers. Acked-by: Linus Walleij <linus.walleij@linaro.org> Tested-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> 
Split the virtual slave channel DMA support from the sa11x0 driver so
this code can be shared with other slave DMA engine drivers.

Acked-by: Linus Walleij <linus.walleij@linaro.org>
Tested-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>