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The VDMA can work in two modes, parking or circular. Do not program the
parking mode registers in case circular mode is used, it is useless.
Signed-off-by: Marek Vasut <marex@denx.de>
Reviewed-by: Radhey Shyam Pandey <radhey.shyam.pandey@amd.com>
Link: https://lore.kernel.org/r/20241031171132.56861-1-marex@denx.de
Signed-off-by: Vinod Koul <vkoul@kernel.org>
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After commit 0edb555a65d1 ("platform: Make platform_driver::remove()
return void") .remove() is (again) the right callback to implement for
platform drivers.
Convert all platform drivers below drivers/dma after the previous
conversion commits apart from the wireless drivers to use .remove(),
with the eventual goal to drop struct platform_driver::remove_new(). As
.remove() and .remove_new() have the same prototypes, conversion is done
by just changing the structure member name in the driver initializer.
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@baylibre.com>
Link: https://lore.kernel.org/r/20241004062227.187726-2-u.kleine-koenig@baylibre.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
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The VDMA HSIZE register (corresponding to sgl[0].size) is only 16bit wide /
the VSIZE register (corresponding to numf) is only 13bit wide, so reject
requests not fitting within that rather than silently transferring too
little data.
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
Reviewed-by: Radhey Shyam Pandey <radhey.shyam.pandey@amd.com>
Link: https://lore.kernel.org/r/20240105105956.1370220-1-peter@korsgaard.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
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Since commit cc99582d46b4 ("dmaengine: xilinx: xilinx_dma: Convert to
platform remove callback returning void") xilinx_dma_remove() doesn't
return zero any more. As the function has no return value any more, just
drop the statement about the return value.
Reported-by: Radhey Shyam Pandey <radhey.shyam.pandey@amd.com>
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Link: https://lore.kernel.org/r/20231014211656.1512016-2-u.kleine-koenig@pengutronix.de
Signed-off-by: Vinod Koul <vkoul@kernel.org>
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void
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 <u.kleine-koenig@pengutronix.de>
Link: https://lore.kernel.org/r/20230919133207.1400430-58-u.kleine-koenig@pengutronix.de
Signed-off-by: Vinod Koul <vkoul@kernel.org>
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Program IRQDelay for AXI DMA. The interrupt timeout mechanism causes
the DMA engine to generate an interrupt after the delay time period
has expired. It enables dmaengine to respond in real-time even though
interrupt coalescing is configured. It also remove the placeholder
for delay interrupt and merge it with frame completion interrupt.
Since by default interrupt delay timeout is disabled this feature
addition has no functional impact on VDMA, MCDMA and CDMA IP's.
Signed-off-by: Radhey Shyam Pandey <radhey.shyam.pandey@amd.com>
Link: https://lore.kernel.org/r/1691387509-2113129-8-git-send-email-radhey.shyam.pandey@amd.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
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Schedule tasklet with high priority to ensure that callback processing
is prioritized. It improves throughput for netdev dma clients.
Signed-off-by: Radhey Shyam Pandey <radhey.shyam.pandey@amd.com>
Link: https://lore.kernel.org/r/1691387509-2113129-7-git-send-email-radhey.shyam.pandey@amd.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
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AXIDMA IP in SG mode sets completion bit to 1 when the transfer is
completed. Read this bit to move descriptor from active list to the
done list. This feature is needed when interrupt delay timeout and
IRQThreshold is enabled i.e Dly_IrqEn is triggered w/o completing
interrupt threshold.
Signed-off-by: Radhey Shyam Pandey <radhey.shyam.pandey@amd.com>
Link: https://lore.kernel.org/r/1691387509-2113129-6-git-send-email-radhey.shyam.pandey@amd.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
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Increase AXI DMA transaction segments count to ensure that even in
high load we always get a free segment in prepare descriptor for a
DMA_SLAVE transaction.
Signed-off-by: Radhey Shyam Pandey <radhey.shyam.pandey@amd.com>
Link: https://lore.kernel.org/r/1691387509-2113129-5-git-send-email-radhey.shyam.pandey@amd.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
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Read DT property to check if AXI DMA is connected to streaming IP
i.e axiethernet. If connected i.e xlnx,axistream-connected property
is present in the dma node then pass AXI4-Stream control words to dma
client using metadata_ops dmaengine API.
If not connected then driver won't support metadata_ops dmaengine API
and continue to support all legacy usecases.
Signed-off-by: Radhey Shyam Pandey <radhey.shyam.pandey@amd.com>
Link: https://lore.kernel.org/r/1691387509-2113129-4-git-send-email-radhey.shyam.pandey@amd.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
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The DT of_device.h and of_platform.h date back to the separate
of_platform_bus_type before it as merged into the regular platform bus.
As part of that merge prepping Arm DT support 13 years ago, they
"temporarily" include each other. They also include platform_device.h
and of.h. As a result, there's a pretty much random mix of those include
files used throughout the tree. In order to detangle these headers and
replace the implicit includes with struct declarations, users need to
explicitly include the correct includes.
Signed-off-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20230718143138.1066177-1-robh@kernel.org
Signed-off-by: Vinod Koul <vkoul@kernel.org>
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for_each_child_of_node()
Since for_each_child_of_node() will increase the refcount of node, we need
to call of_node_put() manually when breaking out of the iteration.
Fixes: 9cd4360de609 ("dma: Add Xilinx AXI Video Direct Memory Access Engine driver support")
Signed-off-by: Liu Shixin <liushixin2@huawei.com>
Acked-by: Peter Korsgaard <peter@korsgaard.com>
Link: https://lore.kernel.org/r/20221122021612.1908866-1-liushixin2@huawei.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
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document xilinx_dma_device_config() return value. Fixes below
kernel-doc warning.
xilinx_dma.c:1665: warning: No description found for return value
of 'xilinx_dma_device_config'
Signed-off-by: Radhey Shyam Pandey <radhey.shyam.pandey@amd.com>
Link: https://lore.kernel.org/r/1666683737-7668-3-git-send-email-radhey.shyam.pandey@amd.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
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Modify xilinx_dma_child_probe() return documentation to be inline
with implementation i.e. can also return failure value on error.
Signed-off-by: Radhey Shyam Pandey <radhey.shyam.pandey@amd.com>
Link: https://lore.kernel.org/r/1666683737-7668-2-git-send-email-radhey.shyam.pandey@amd.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
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failure
The driver does not handle the failure case while calling
dma_set_mask_and_coherent API.
In case of failure, capture the return value of API and then report an
error.
Addresses-coverity: Unchecked return value (CHECKED_RETURN)
Signed-off-by: Swati Agarwal <swati.agarwal@xilinx.com>
Reviewed-by: Radhey Shyam Pandey <radhey.shyam.pandey@xilinx.com>
Link: https://lore.kernel.org/r/20220817061125.4720-4-swati.agarwal@xilinx.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
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Free the allocated resources for missing xlnx,num-fstores property.
Signed-off-by: Swati Agarwal <swati.agarwal@xilinx.com>
Link: https://lore.kernel.org/r/20220817061125.4720-3-swati.agarwal@xilinx.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
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Add missing cleanup in devm_platform_ioremap_resource().
When probe fails remove dma channel resources and disable clocks in
accordance with the order of resources allocated .
Signed-off-by: Swati Agarwal <swati.agarwal@xilinx.com>
Link: https://lore.kernel.org/r/20220817061125.4720-2-swati.agarwal@xilinx.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
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This was removed before due to the complete lack of users, but
3218910fd585 ("dmaengine: Add core function and capability check for
DMA_MEMCPY_SG") and 29cf37fa6dd9 ("dmaengine: Add consumer for the new
DMA_MEMCPY_SG API function.") added it back despite still not having
any users whatsoever.
Fixes: 3218910fd585 ("dmaengine: Add core function and capability check for DMA_MEMCPY_SG")
Fixes: 29cf37fa6dd9 ("dmaengine: Add consumer for the new DMA_MEMCPY_SG API function.")
Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Michal Simek <michal.simek@amd.com>
Link: https://lore.kernel.org/r/20220606074733.622616-1-hch@lst.de
Signed-off-by: Vinod Koul <vkoul@kernel.org>
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Handle errors when trying to map the IRQ for the DMA channels.
The main motivation here is to be able to handle probe deferral. E.g. when
using DT overlays it is possible that the DMA controller is probed before
interrupt controller, depending on the order in the DT.
In order to support this switch from irq_of_parse_and_map() to
of_irq_get(), which internally does the same, but it will return
EPROBE_DEFER when the interrupt controller is not yet available.
As a result other errors, such as an invalid IRQ specification, or missing
IRQ are also properly handled.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Reviewed-by: Radhey Shyam Pandey <radhey.shyam.pandey@xilinx.com>
Link: https://lore.kernel.org/r/20211208114212.234130-1-lars@metafoo.de
Signed-off-by: Vinod Koul <vkoul@kernel.org>
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This new CDMA binding for device_prep_dma_memcpy_sg was partially borrowed
from xlnx kernel tree, an expanded with extended address space support when
linking descriptor segments and checking for incorrect zero transfer size.
Signed-off-by: Adrian Larumbe <adrianml@alumnos.upm.es>
Link: https://lore.kernel.org/r/20211101180825.241048-4-adrianml@alumnos.upm.es
Signed-off-by: Vinod Koul <vkoul@kernel.org>
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DMA clients can provide one of two types of callbacks. For this reason
dmaengine drivers should not directly invoke `callback`, but always use
`dmaengine_desc_callback_invoke()`. This makes sure that both types of
callbacks are handled correctly.
The xilinx_dma driver currently doesn't do this for cyclic descriptors and
only handles the `callback` type callback. If the client used the
`callback_result` type callback it will not be called.
Fix this by switching to `dmaengine_desc_callback_valid()` and
`dmaengine_desc_callback_invoke()`.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Link: https://lore.kernel.org/r/20211025075428.2094-2-lars@metafoo.de
Signed-off-by: Vinod Koul <vkoul@kernel.org>
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Modify the prototype from xilinx_dma_tx_descriptor to
xilinx_dma_alloc_tx_descriptor and xilinx_dma_channel_set_config
to xilinx_vdma_channel_set_config in API description to
fix below linux kernel-doc warnings.
drivers/dma/xilinx/xilinx_dma.c:800: warning: expecting
prototype for xilinx_dma_tx_descriptor(). Prototype was
for xilinx_dma_alloc_tx_descriptor() instead.
drivers/dma/xilinx/xilinx_dma.c:2471: warning: expecting
prototype for xilinx_dma_channel_set_config(). Prototype
was for xilinx_vdma_channel_set_config() instead.
Signed-off-by: Shravya Kumbham <shravya.kumbham@xilinx.com>
Signed-off-by: Radhey Shyam Pandey <radhey.shyam.pandey@xilinx.com>
Link: https://lore.kernel.org/r/1631525316-2323-1-git-send-email-radhey.shyam.pandey@xilinx.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
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The xilinx dma driver uses the consistent allocations, so for correct
operation also set the DMA mask for coherent APIs. It fixes the below
kernel crash with dmatest client when DMA IP is configured with 64-bit
address width and linux is booted from high (>4GB) memory.
Call trace:
[ 489.531257] dma_alloc_from_pool+0x8c/0x1c0
[ 489.535431] dma_direct_alloc+0x284/0x330
[ 489.539432] dma_alloc_attrs+0x80/0xf0
[ 489.543174] dma_pool_alloc+0x160/0x2c0
[ 489.547003] xilinx_cdma_prep_memcpy+0xa4/0x180
[ 489.551524] dmatest_func+0x3cc/0x114c
[ 489.555266] kthread+0x124/0x130
[ 489.558486] ret_from_fork+0x10/0x3c
[ 489.562051] ---[ end trace 248625b2d596a90a ]---
Signed-off-by: Radhey Shyam Pandey <radhey.shyam.pandey@xilinx.com>
Reviewed-by: Harini Katakam <harini.katakam@xilinx.com>
Link: https://lore.kernel.org/r/1629363528-30347-1-git-send-email-radhey.shyam.pandey@xilinx.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
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Various DMA users call the dmaengine_slave_config() and expect it to
succeed, but that can only succeed if .device_config is implemented.
Add empty device_config function rather than patching all the places
which use dmaengine_slave_config().
Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Akinobu Mita <akinobu.mita@gmail.com>
Cc: Kedareswara rao Appana <appana.durga.rao@xilinx.com>
Cc: Michal Simek <monstr@monstr.eu>
Cc: Vinod Koul <vkoul@kernel.org>
Link: https://lore.kernel.org/r/20210804195140.61396-1-marex@denx.de
Signed-off-by: Vinod Koul <vkoul@kernel.org>
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Using list_move_tail() instead of list_del() + list_add_tail().
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Baokun Li <libaokun1@huawei.com>
Reviewed-by: Radhey Shyam Pandey <radhey.shyam.pandey@xilinx.com>
Link: https://lore.kernel.org/r/20210608030905.2818831-1-libaokun1@huawei.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
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When user calls dmaengine_terminate_sync, the driver will clean up any
remaining descriptors for all the pending or active transfers that had
previously been submitted. However, this might happen whilst the tasklet is
invoking the DMA callback for the last finished transfer, so by the time it
returns and takes over the channel's spinlock, the list of completed
descriptors it was traversing is no longer valid. This leads to a
read-after-free situation.
Fix it by signalling whether a user-triggered termination has happened by
means of a boolean variable.
Signed-off-by: Adrian Larumbe <adrian.martinezlarumbe@imgtec.com>
Link: https://lore.kernel.org/r/20210706234338.7696-3-adrian.martinezlarumbe@imgtec.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
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The Xilinx dmaengine driver uses a tasklet to process completed
descriptors and execute their callbacks.
Currently consumers of the DMA channel have to no method of synchronization
against this tasklet when using the Xilinx dmaengine drivers. This can lead
to race conditions when the consumer frees resources that are accessed in
the callback before the tasklet has finished running.
It is not enough to just call dmaengine_terminal_all() since on a
multi-processor system the tasklet can run concurrently to it and might
call the callback after dmaengine_terminate_all() has already finished.
To mitigate this issue implement the synchronize() callback for the driver,
which will wait until the tasklet has finished.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Link: https://lore.kernel.org/r/20210313125311.4823-1-lars@metafoo.de
Signed-off-by: Vinod Koul <vkoul@kernel.org>
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git://git.kernel.org/pub/scm/linux/kernel/git/vkoul/dmaengine
Pull dmaengine updates from Vinod Koul:
"We have couple of drivers removed a new driver and bunch of new device
support and few updates to drivers for this round.
New drivers/devices:
- Intel LGM SoC DMA driver
- Actions Semi S500 DMA controller
- Renesas r8a779a0 dma controller
- Ingenic JZ4760(B) dma controller
- Intel KeemBay AxiDMA controller
Removed:
- Coh901318 dma driver
- Zte zx dma driver
- Sirfsoc dma driver
Updates:
- mmp_pdma, mmp_tdma gained module support
- imx-sdma become modern and dropped platform data support
- dw-axi driver gained slave and cyclic dma support"
* tag 'dmaengine-5.12-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/vkoul/dmaengine: (58 commits)
dmaengine: dw-axi-dmac: remove redundant null check on desc
dmaengine: xilinx_dma: Alloc tx descriptors GFP_NOWAIT
dmaengine: dw-axi-dmac: Virtually split the linked-list
dmaengine: dw-axi-dmac: Set constraint to the Max segment size
dmaengine: dw-axi-dmac: Add Intel KeemBay AxiDMA BYTE and HALFWORD registers
dmaengine: dw-axi-dmac: Add Intel KeemBay AxiDMA handshake
dmaengine: dw-axi-dmac: Add Intel KeemBay AxiDMA support
dmaengine: drivers: Kconfig: add HAS_IOMEM dependency to DW_AXI_DMAC
dmaengine: dw-axi-dmac: Add Intel KeemBay DMA register fields
dt-binding: dma: dw-axi-dmac: Add support for Intel KeemBay AxiDMA
dmaengine: dw-axi-dmac: Support burst residue granularity
dmaengine: dw-axi-dmac: Support of_dma_controller_register()
dmaegine: dw-axi-dmac: Support device_prep_dma_cyclic()
dmaengine: dw-axi-dmac: Support device_prep_slave_sg
dmaengine: dw-axi-dmac: Add device_config operation
dmaengine: dw-axi-dmac: Add device_synchronize() callback
dmaengine: dw-axi-dmac: move dma_pool_create() to alloc_chan_resources()
dmaengine: dw-axi-dmac: simplify descriptor management
dt-bindings: dma: Add YAML schemas for dw-axi-dmac
dmaengine: ti: k3-psil: optimize struct psil_endpoint_config for size
...
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Use GFP_NOWAIT allocation in xilinx_dma_alloc_tx_descriptor().
This is necessary for compatibility with ALSA, which calls
dmaengine_prep_dma_cyclic() from an atomic context.
Signed-off-by: Richard Fitzgerald <rf@opensource.cirrus.com>
Link: https://lore.kernel.org/r/20210129170800.31857-1-rf@opensource.cirrus.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
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Typecast the fls(width -1) with (enum dmaengine_alignment) in
xilinx_dma_chan_probe function to fix the coverity warning.
Addresses-Coverity: Event mixed_enum_type.
Fixes: 9cd4360de609 ("dma: Add Xilinx AXI Video Direct Memory Access Engine driver support")
Signed-off-by: Shravya Kumbham <shravya.kumbham@xilinx.com>
Signed-off-by: Radhey Shyam Pandey <radhey.shyam.pandey@xilinx.com>
Link: https://lore.kernel.org/r/1608722462-29519-4-git-send-email-radhey.shyam.pandey@xilinx.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
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In xilinx_dma_child_probe function, the nr_channels variable is
passed to of_property_read_u32() which expects an u32 return value
pointer. Modify the nr_channels variable type from int to u32 to
fix the incompatible parameter coverity warning.
Addresses-Coverity: Event incompatible_param.
Fixes: 1a9e7a03c761 ("dmaengine: vdma: Add support for mulit-channel dma mode")
Signed-off-by: Shravya Kumbham <shravya.kumbham@xilinx.com>
Signed-off-by: Radhey Shyam Pandey <radhey.shyam.pandey@xilinx.com>
Link: https://lore.kernel.org/r/1608722462-29519-3-git-send-email-radhey.shyam.pandey@xilinx.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
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dma_async_device_register() can return non-zero error code. Add
condition to check the return value of dma_async_device_register
function and handle the error path.
Addresses-Coverity: Event check_return.
Fixes: 9cd4360de609 ("dma: Add Xilinx AXI Video Direct Memory Access Engine driver support")
Signed-off-by: Shravya Kumbham <shravya.kumbham@xilinx.com>
Signed-off-by: Radhey Shyam Pandey <radhey.shyam.pandey@xilinx.com>
Link: https://lore.kernel.org/r/1608722462-29519-2-git-send-email-radhey.shyam.pandey@xilinx.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
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The SG capability is inherently present with Multichannel DMA operation.
The register used to check for this capability with other DMA driver types
is not defined for MCDMA.
Fixes: 6ccd692bfb7f ("dmaengine: xilinx_dma: Add Xilinx AXI MCDMA Engine driver support")
Signed-off-by: Matthew Murrian <matthew.murrian@goctsi.com>
Signed-off-by: Radhey Shyam Pandey <radhey.shyam.pandey@xilinx.com>
Link: https://lore.kernel.org/r/1604473206-32573-4-git-send-email-radhey.shyam.pandey@xilinx.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
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Several code sections incorrectly use struct xilinx_axidma_tx_segment
instead of struct xilinx_aximcdma_tx_segment when operating as
Multichannel DMA. As their structures are similar, this just works.
Fixes: 6ccd692bfb7f ("dmaengine: xilinx_dma: Add Xilinx AXI MCDMA Engine driver support")
Signed-off-by: Matthew Murrian <matthew.murrian@goctsi.com>
Signed-off-by: Radhey Shyam Pandey <radhey.shyam.pandey@xilinx.com>
Link: https://lore.kernel.org/r/1604473206-32573-3-git-send-email-radhey.shyam.pandey@xilinx.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
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The xilinx_dma_poll_timeout macro is sometimes called while holding a
spinlock (see xilinx_dma_issue_pending() for an example) this means we
shouldn't sleep when polling the dma channel registers. To address it
in xilinx poll timeout macro use readl_poll_timeout_atomic instead of
readl_poll_timeout variant.
Signed-off-by: Marc Ferland <ferlandm@amotus.ca>
Signed-off-by: Radhey Shyam Pandey <radhey.shyam.pandey@xilinx.com>
Link: https://lore.kernel.org/r/1604473206-32573-2-git-send-email-radhey.shyam.pandey@xilinx.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
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Commit f19a11d40a78 ("dmaengine: xilinx: convert tasklets to use new
tasklet_setup() API") updated driver to use new tasklet_setup() API but
missed to update the documentation for the tasklet function.
Fixes: f19a11d40a78 ("dmaengine: xilinx: convert tasklets to use new tasklet_setup() API")
Acked-by: Michal Simek <michal.simek@xilinx.com>
Link: https://lore.kernel.org/r/20201007083113.567559-4-vkoul@kernel.org
Signed-off-by: Vinod Koul <vkoul@kernel.org>
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In preparation for unconditionally passing the
struct tasklet_struct pointer to all tasklet
callbacks, switch to using the new tasklet_setup()
and from_tasklet() to pass the tasklet pointer explicitly.
Signed-off-by: Romain Perier <romain.perier@gmail.com>
Signed-off-by: Allen Pais <allen.lkml@gmail.com>
Link: https://lore.kernel.org/r/20200831103542.305571-33-allen.lkml@gmail.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
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Common pattern of handling deferred probe can be simplified with
dev_err_probe(). Less code and the error value gets printed.
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Link: https://lore.kernel.org/r/20200828152637.16903-3-krzk@kernel.org
Signed-off-by: Vinod Koul <vkoul@kernel.org>
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The DMA transfer might finish just after checking the state with
dma_cookie_status, but before the lock is acquired. Not checking
for an empty list in xilinx_dma_tx_status may result in reading
random data or data corruption when desc is written to. This can
be reliably triggered by using dma_sync_wait to wait for DMA
completion.
Signed-off-by: Sebastian von Ohr <vonohr@smaract.com>
Tested-by: Radhey Shyam Pandey <radhey.shyam.pandey@xilinx.com>
Link: https://lore.kernel.org/r/20200303130518.333-1-vonohr@smaract.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
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In overlay application we noticed that dma channel node probe order is
inverted i.e s2mm channel is probed first followed by mm2s channel. The
reason for this inversion is fdtoverlay utility which uses a function
called fdt_add_subnode(*). It stores the subnodes after the properties,
this has the effect of inserting the new subnode before any others and
the end result is a reversal.
Because of this inverted channel probe order, the node probed first is
assigned a '0' index instead of Channel ID should be '0' for tx and '1'
for rx and dmatest client using the DT convention fails in dma transfer
as channel are swapped.
To fix above behavior and make channel assignment index independent
of probe order, always assign mm2s channel at '0' index and the s2mm
channel at IP specific fixed offset derived from the max_channels
count.
Signed-off-by: Radhey Shyam Pandey <radhey.shyam.pandey@xilinx.com>
Link: https://lore.kernel.org/r/1580388865-9960-3-git-send-email-radhey.shyam.pandey@xilinx.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
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Extend dma_config structure to store the max channel count. This input is
used to populate dma device channel nodes at the fixed offset. It serves
as a preparatory patch for removing dma channel DT node order dependency,
added in the subsequent commit.
Signed-off-by: Radhey Shyam Pandey <radhey.shyam.pandey@xilinx.com>
Link: https://lore.kernel.org/r/1580388865-9960-2-git-send-email-radhey.shyam.pandey@xilinx.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
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Reset DMA channel after stop to ensure that pending transfers and FIFOs
in the datapath are flushed or completed. It also cleanup the terminate
path and removes stop for the cyclic mode as after the reset stop is not
required. This fixes intermittent data verification failure when xilinx
dma test the client is stressed and loaded/unloaded multiple times.
Signed-off-by: Radhey Shyam Pandey <radhey.shyam.pandey@xilinx.com>
Link: https://lore.kernel.org/r/1580283909-32678-1-git-send-email-radhey.shyam.pandey@xilinx.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
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Add support for AXI Multichannel Direct Memory Access (AXI MCDMA)
core, which is a soft Xilinx IP core that provides high-bandwidth
direct memory access between memory and AXI4-Stream target peripherals.
The AXI MCDMA core provides scatter-gather interface with multiple
independent transmit and receive channels. The driver supports
device_prep_slave_sg slave transfer mode.
Signed-off-by: Radhey Shyam Pandey <radhey.shyam.pandey@xilinx.com>
Link: https://lore.kernel.org/r/1571763622-29281-7-git-send-email-radhey.shyam.pandey@xilinx.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
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Extend dma_config structure to store irq routine handle. It enables runtime
handler selection based on xdma_ip_type and serves as preparatory patch for
adding MCDMA IP support.
Signed-off-by: Radhey Shyam Pandey <radhey.shyam.pandey@xilinx.com>
Suggested-by: Vinod Koul <vkoul@kernel.org>
Link: https://lore.kernel.org/r/1571763622-29281-6-git-send-email-radhey.shyam.pandey@xilinx.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
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The AXI DMA multichannel support is deprecated in the IP and it is no
longer actively supported. For multichannel support, refer to the AXI
multichannel direct memory access IP product guide(PG228) and MCDMA
driver. So inline with it remove axidma multichannel support from
from the driver.
Signed-off-by: Radhey Shyam Pandey <radhey.shyam.pandey@xilinx.com>
Link: https://lore.kernel.org/r/1571763622-29281-5-git-send-email-radhey.shyam.pandey@xilinx.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
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Whenever we reset the channel, we need to clear desc_pendingcount
along with desc_submitcount. Otherwise when a new transaction is
submitted, the irq coalesce level could be programmed to an incorrect
value in the axidma case.
This behavior can be observed when terminating pending transactions
with xilinx_dma_terminate_all() and then submitting new transactions
without releasing and requesting the channel.
Signed-off-by: Nicholas Graumann <nick.graumann@gmail.com>
Signed-off-by: Radhey Shyam Pandey <radhey.shyam.pandey@xilinx.com>
Link: https://lore.kernel.org/r/1571150904-3988-8-git-send-email-radhey.shyam.pandey@xilinx.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
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The driver should not run out of tx segments in normal operation. But,
if the user attempts to prepare a transaction with a large sg list,
the driver may not have enough free segments to accommodate the request.
Log a message at the debug level to inform the user in case they are
experiencing issues.
Signed-off-by: Nicholas Graumann <nick.graumann@gmail.com>
Signed-off-by: Radhey Shyam Pandey <radhey.shyam.pandey@xilinx.com>
Link: https://lore.kernel.org/r/1571150904-3988-7-git-send-email-radhey.shyam.pandey@xilinx.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
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Take advantage of dmaengine_desc_get_callback_invoke which allows either
a callback or callback_result to be specified. This can be useful when
using the AXI DMA transfer unknown quantities of data where the residue
contained in the result can be used to calculate the number of bytes
transferred.
Signed-off-by: Nicholas Graumann <nick.graumann@gmail.com>
Signed-off-by: Radhey Shyam Pandey <radhey.shyam.pandey@xilinx.com>
Link: https://lore.kernel.org/r/1571150904-3988-6-git-send-email-radhey.shyam.pandey@xilinx.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
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Introduce a function that can calculate residues for IPs that support it:
AXI DMA and CDMA.
Signed-off-by: Nicholas Graumann <nick.graumann@gmail.com>
Signed-off-by: Radhey Shyam Pandey <radhey.shyam.pandey@xilinx.com>
Link: https://lore.kernel.org/r/1571150904-3988-5-git-send-email-radhey.shyam.pandey@xilinx.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
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