kernel/drivers/dma/dw_dmac.c, branch linux-rolling-stable

dma: move dw_dmac driver to an own directory

2013-07-05T06:10:43Z

The dw_dmac driver is going to be split into multiple files. To make this more convenient move it to an own directory. Signed-off-by: Andy Shevchenko Acked-by: Viresh Kumar Acked-by: Arnd Bergmann Signed-off-by: Vinod Koul

dw_dmac: don't check resource with devm_ioremap_resource

2013-07-05T06:10:42Z

devm_ioremap_resource does sanity checks on the given resource. No need to duplicate this in the driver. Signed-off-by: Andy Shevchenko Acked-by: Viresh Kumar Acked-by: Arnd Bergmann Signed-off-by: Vinod Koul

dw_dmac: remove inline marking of EXPORT_SYMBOL functions

2013-07-05T06:10:36Z

EXPORT_SYMBOL and inline directives are contradictory to each other. The patch fixes this inconsistency. Found by Linux Driver Verification project (linuxtesting.org). Signed-off-by: Denis Efremov Acked-by: Viresh Kumar Signed-off-by: Vinod Koul

dw_dmac: add ACPI support

2013-04-15T16:34:19Z

Since we have proper ACPI DMA helpers implemented, the driver may use it. This patch introduces custom filter function together with acpi_device_id table. Signed-off-by: Mika Westerberg Signed-off-by: Andy Shevchenko Signed-off-by: Vinod Koul

dw_dmac: remove unnecessary ENODEV check

2013-04-15T04:21:19Z

If CONFIG_OF is not set the of_node of the device will always be NULL. Signed-off-by: Andy Shevchenko Acked-by: Viresh Kumar Acked-by: Arnd Bergmann Signed-off-by: Vinod Koul

dmaengine: dw_dmac: simplify master selection

2013-04-15T04:21:19Z

The patch to add the common DMA binding added a dummy dw_dma_slave structure into the dw_dma_chan structure in order to configure the masters correctly. It turns out that this can be simplified if we pick the DMA masters in the dwc_alloc_chan_resources function instead and save them in the dw_dma_chan structure directly. This could be simplified further once all users that today use dw_dma_slave for configuration get converted to device tree based setup instead. Signed-off-by: Arnd Bergmann Signed-off-by: Andy Shevchenko Acked-by: Viresh Kumar Cc: linux-arm-kernel@lists.infradead.org Acked-by: Arnd Bergmann Signed-off-by: Vinod Koul

dw_dmac: rename DT related methods to reflect their belonging

2013-04-15T04:21:19Z

Since we will have not only DT cases in future let's rename DT related methods to reflect their belonging. The rename was done as follows: struct dw_dma_filter_args -> struct dw_dma_of_filter_args dw_dma_generic_filter() -> dw_dma_of_filter() dw_dma_xlate() -> dw_dma_of_xlate() dw_dma_id_table -> dw_dma_of_id_table There is no functional change. Signed-off-by: Andy Shevchenko Acked-by: Viresh Kumar Acked-by: Arnd Bergmann Signed-off-by: Vinod Koul

dw_dmac: fix style of the comments

2013-04-15T04:21:19Z

Let's use capital letter as a first one in the comments. There is no functional changes. Signed-off-by: Andy Shevchenko Acked-by: Arnd Bergmann Acked-by: Viresh Kumar Signed-off-by: Vinod Koul

dw_dmac: don't wait for FIFO_EMPTY endlessly in dwc_chan_pause

2013-04-15T04:21:18Z

When we pause the channel after transfer is completed we might stuck in the dwc_chan_pause() because the FIFO_EMPTY flag will never be asserted. To avoid the endless loop we introduce a timeout here (*). The proper solution is to somehow get the residue in FIFO and avoid busyloop when transfer is done, but this task is not simple and fast. Unfortunately we can't use cpu_relax() in conjunction with jiffies checker, due to we have interrupts disabled by spin_lock_irqsave() and there is a big chance that no interrupts will come to update the jiffies.. (*) The worst case is AHB write * FIFO size / hclk = 5.12 us, where AHB write = 2 cycles, hclk = 100 MHz, burst size = 1 byte, FIFO size = 256 bytes. The proposed 40us timeout might be considered as a big one, though we enter to that state only when we have the transfer already completed. Signed-off-by: Andy Shevchenko Acked-by: Viresh Kumar Signed-off-by: Vinod Koul

dw_dmac: adjust slave_id accordingly to request line base

2013-03-29T23:04:07Z

On some hardware configurations we have got the request line with the offset. The patch introduces convert_slave_id() helper for that cases. The request line base is came from the driver data provided by the platform_device_id table. Signed-off-by: Mika Westerberg Signed-off-by: Andy Shevchenko Cc: Viresh Kumar Acked-by: Viresh Kumar Signed-off-by: Vinod Koul