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Since a local variable contains the number of hardware desriptors at the
beginning of idma64_desc_fill() we may use it to index the last descriptor as
well.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
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Explicitly show in idma64_desc_fill() how we link the hardware
descriptors.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
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This tells, for example, IOMMU what the maximum size of a segment
the DMA controller can send.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
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There is no need to disable interrupts in the IRQ handler. The driver
guarantess that at one time only one descriptor is active, besides the fact
that each call to the same channel will be serialized in idma64_chan_irq()
handler anyway.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
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Pull dmaengine updates from Vinod Koul:
"This time we have a very typical update which is mostly fixes and
updates to drivers and no new drivers.
- the biggest change is coming from Peter for edma cleanup which even
caused some last minute regression, things seem settled now
- idma64 and dw updates
- iotdma updates
- module autoload fixes for various drivers
- scatter gather support for hdmac"
* tag 'dmaengine-4.4-rc1' of git://git.infradead.org/users/vkoul/slave-dma: (77 commits)
dmaengine: edma: Add dummy driver skeleton for edma3-tptc
Revert "ARM: DTS: am33xx: Use the new DT bindings for the eDMA3"
Revert "ARM: DTS: am437x: Use the new DT bindings for the eDMA3"
dmaengine: dw: some Intel devices has no memcpy support
dmaengine: dw: platform: provide platform data for Intel
dmaengine: dw: don't override platform data with autocfg
dmaengine: hdmac: Add scatter-gathered memset support
dmaengine: hdmac: factorise memset descriptor allocation
dmaengine: virt-dma: Fix kernel-doc annotations
ARM: DTS: am437x: Use the new DT bindings for the eDMA3
ARM: DTS: am33xx: Use the new DT bindings for the eDMA3
dmaengine: edma: New device tree binding
dmaengine: Kconfig: edma: Select TI_DMA_CROSSBAR in case of ARCH_OMAP
dmaengine: ti-dma-crossbar: Add support for crossbar on AM33xx/AM43xx
dmaengine: edma: Merge the of parsing functions
dmaengine: edma: Do not allocate memory for edma_rsv_info in case of DT boot
dmaengine: edma: Refactor the dma device and channel struct initialization
dmaengine: edma: Get qDMA channel information from HW also
dmaengine: edma: Merge map_dmach_to_queue into assign_channel_eventq
dmaengine: edma: Correct PaRAM access function names (_parm_ to _param_)
...
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Accordingly to the documentation the CH_DRAIN bit enforses single bursts when
channel is going to be suspended. This, in case when channel will be resumed,
makes data to flow in non-optimal mode until DMA returns to full burst mode.
The fix differentiates pause / resume cycle from pause / terminate and sets
CH_DRAIN bit accordingly.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
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We use a pattern
x = min_t(u32, <LOG2_CONSTANT>, __ffs(expr));
There is no need to use min_t() since we can replace it by
x = __ffs(expr | <2^LOG2_CONST>);
and moreover guarantee that argument of __ffs() will be not zero.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
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We replace __fls() by __ffs() since we have to find a *minimum* data width that
satisfies both source and destination.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
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The residue calculation may provide a wrong estimation when the transfer is
started. There are possible scenarios we have to separate:
1) the transfer is not started yet; residue is equal to the total
length;
2) the transfer is just started (first chunk is ongoing); residue is
equal to the total length without already transfered bytes;
3) the transfer is ongoing and we already sent few chunks of data;
residue is equal to the total length without fully transfered chunks
and already sent bytes.
Mistakenly the calculation in cases 2) and 3) was done in the similar way and
the result is equal to -bytes that have been transfered, i.e. quite big since
size_t type can't keep negative values.
Rewrite the calculation algorithm to be one pass and have a correct result.
Besides above in case user asks for a status of the active DMA descriptor
without pausing an ongoing transfer the residue will be estimated based on the
register value, though it's still racy. Since the transfer is active the value
is continuously being changed. Here we have to read two registers at a time. To
minimize an error make those reads close to each other.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
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Intel integrated DMA (iDMA) 64-bit is a specific IP that is used as a part of
LPSS devices such as HSUART or SPI. The iDMA IP is attached for private
usage on each host controller independently.
While it has similarities with Synopsys DesignWare DMA, the following
distinctions doesn't allow to use the existing driver:
- 64-bit mode with corresponding changes in Hardware Linked List data structure
- many slight differences in the channel registers
Moreover this driver is based on the DMA virtual channels framework that helps
to make the driver cleaner and easy to understand.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
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