linux.git/drivers/dma/dw/platform.c, branch v6.7

dmaengine: dw: platform: Convert to platform remove callback returning void

2023-09-28T07:40:47+00:00

The .remove() callback for a platform driver returns an int which makes
many driver authors wrongly assume it's possible to do error handling by
returning an error code. However the value returned is ignored (apart
from emitting a warning) and this typically results in resource leaks.
To improve here there is a quest to make the remove callback return
void. In the first step of this quest all drivers are converted to
.remove_new() which already returns void. Eventually after all drivers
are converted, .remove_new() is renamed to .remove().

Trivially convert this driver from always returning zero in the remove
callback to the void returning variant.

Signed-off-by: Uwe Kleine-König 
Acked-by: Viresh Kumar 
Link: https://lore.kernel.org/r/20230919133207.1400430-12-u.kleine-koenig@pengutronix.de
Signed-off-by: Vinod Koul

dmaengine: dw: Add RZN1 compatible

2022-05-19T17:04:51+00:00

The Renesas RZN1 DMA IP is very close to the original DW DMA IP, a DMA
router has been introduced to handle the wiring options that have been
added.

Signed-off-by: Miquel Raynal 
Reviewed-by: Geert Uytterhoeven 
Acked-by: Andy Shevchenko 
Acked-By: Vinod Koul 
Link: https://lore.kernel.org/r/20220427095653.91804-8-miquel.raynal@bootlin.com
Signed-off-by: Vinod Koul

dmaengine: dw: Program xBAR hardware for Elkhart Lake

2021-07-14T04:46:30+00:00

Intel Elkhart Lake PSE DMA implementation is integrated with crossbar IP
in order to serve more hardware than there are DMA request lines available.

Due to this, program xBAR hardware to make flexible support of PSE peripheral.

The Device-to-Device has not been tested and it's not supported by DMA Engine,
but it's left in the code for the sake of documenting hardware features.

Signed-off-by: Andy Shevchenko 
Link: https://lore.kernel.org/r/20210712113940.42753-1-andriy.shevchenko@linux.intel.com
Signed-off-by: Vinod Koul

dmaengine: dw: platform: Mark 'hclk' clock optional

2019-10-14T08:21:44+00:00

On some platforms the clock can be fixed rate, always running one and
there is no need to do anything with it.

In order to support those platforms, switch to use optional clock.

Fixes: f8d9ddbc2851 ("dmaengine: dw: platform: Enable iDMA 32-bit on Intel Elkhart Lake")
Depends-on: 60b8f0ddf1a9 ("clk: Add (devm_)clk_get_optional() functions")
Signed-off-by: Andy Shevchenko 
Acked-by: Viresh Kumar 
Link: https://lore.kernel.org/r/20190924085116.83683-1-andriy.shevchenko@linux.intel.com
Signed-off-by: Vinod Koul

dmaengine: dw: platform: Split OF helpers to separate module

2019-08-21T04:11:28+00:00

For better maintenance split OF helpers to the separate module.

Signed-off-by: Andy Shevchenko 
Link: https://lore.kernel.org/r/20190820131546.75744-11-andriy.shevchenko@linux.intel.com
Signed-off-by: Vinod Koul

dmaengine: dw: platform: Split ACPI helpers to separate module

2019-08-21T04:11:28+00:00

For better maintenance split ACPI helpers to the separate module.

Signed-off-by: Andy Shevchenko 
Link: https://lore.kernel.org/r/20190820131546.75744-10-andriy.shevchenko@linux.intel.com
Signed-off-by: Vinod Koul

dmaengine: dw: platform: Move handle check to dw_dma_acpi_controller_register()

2019-08-21T04:11:28+00:00

Move ACPI handle check to the dw_dma_acpi_controller_register().

While here, convert it to has_acpi_companion() which is recommended way.

Signed-off-by: Andy Shevchenko 
Link: https://lore.kernel.org/r/20190820131546.75744-9-andriy.shevchenko@linux.intel.com
Signed-off-by: Vinod Koul

dmaengine: dw: platform: Switch to acpi_dma_controller_register()

2019-08-21T04:11:28+00:00

There is a possibility to have registered ACPI DMA controller
while it has been gone already.

To avoid the potential crash, move to non-managed
acpi_dma_controller_register().

Fixes: 42c91ee71d6d ("dw_dmac: add ACPI support")
Signed-off-by: Andy Shevchenko 
Link: https://lore.kernel.org/r/20190820131546.75744-8-andriy.shevchenko@linux.intel.com
Signed-off-by: Vinod Koul

dmaengine: dw: platform: Use devm_platform_ioremap_resource()

2019-08-21T04:11:28+00:00

Use the new helper that wraps the calls to platform_get_resource()
and devm_ioremap_resource() together.

Signed-off-by: Andy Shevchenko 
Link: https://lore.kernel.org/r/20190820131546.75744-7-andriy.shevchenko@linux.intel.com
Signed-off-by: Vinod Koul

dmaengine: dw: platform: Enable iDMA 32-bit on Intel Elkhart Lake

2019-08-21T04:11:27+00:00

Intel® PSE (Programmable Services Engine) provides few DMA controllers
to the host on Intel Elkhart Lake. Enable them in the ACPI glue driver.

Signed-off-by: Andy Shevchenko 
Link: https://lore.kernel.org/r/20190820131546.75744-6-andriy.shevchenko@linux.intel.com
Signed-off-by: Vinod Koul