linux-toradex.git/drivers/dma/sh/rcar-dmac.c, branch v4.4.156

dmaengine: rcar-dmac: fix max_chunk_size for R-Car Gen3

2018-05-30T05:49:02+00:00

[ Upstream commit d716d9b702bb759dd6fb50804f10a174bd156d71 ]

According to R-Car Gen3 Rev.0.80 manual, the DMATCR can be set to
16,777,215 as maximum. So, this patch fixes the max_chunk_size for
safety on all of SoCs. Otherwise, a system may hang if the DMATCR
is set to 0 on R-Car Gen3.

Signed-off-by: Yoshihiro Shimoda 
Reviewed-by: Simon Horman 
Signed-off-by: Vinod Koul 
Signed-off-by: Sasha Levin 
Signed-off-by: Greg Kroah-Hartman

Merge tag 'dmaengine-4.2-rc1' of git://git.infradead.org/users/vkoul/slave-dma

2015-06-29T16:44:45+00:00

Pull dmaengine updates from Vinod Koul:
 "This time we have support for few new devices, few new features and
  odd fixes spread thru the subsystem.

  New devices added:
   - support for CSRatlas7 dma controller
   - Allwinner H3(sun8i) controller
   - TI DMA crossbar driver on DRA7x
   - new pxa driver

  New features added:
   - memset support is bought back now that we have a user in xdmac controller
   - interleaved transfers support different source and destination strides
   - supporting DMA routers and configuration thru DT
   - support for reusing descriptors
   - xdmac memset and interleaved transfer support
   - hdmac support for interleaved transfers
   - omap-dma support for memcpy

  Others:
   - Constify platform_device_id
   - mv_xor fixes and improvements"

* tag 'dmaengine-4.2-rc1' of git://git.infradead.org/users/vkoul/slave-dma: (46 commits)
  dmaengine: xgene: fix file permission
  dmaengine: fsl-edma: clear pending interrupts on initialization
  dmaengine: xdmac: Add memset support
  Documentation: dmaengine: document DMA_CTRL_ACK
  dmaengine: virt-dma: don't always free descriptor upon completion
  dmaengine: Revert "drivers/dma: remove unused support for MEMSET operations"
  dmaengine: hdmac: Implement interleaved transfers
  dmaengine: Move icg helpers to global header
  dmaengine: mv_xor: improve descriptors list handling and reduce locking
  dmaengine: mv_xor: Enlarge descriptor pool size
  dmaengine: mv_xor: add support for a38x command in descriptor mode
  dmaengine: mv_xor: Rename function for consistent naming
  dmaengine: mv_xor: bug fix for racing condition in descriptors cleanup
  dmaengine: pl330: fix wording in mcbufsz message
  dmaengine: sirf: add CSRatlas7 SoC support
  dmaengine: xgene-dma: Fix "incorrect type in assignement" warnings
  dmaengine: fix kernel-doc documentation
  dmaengine: pxa_dma: add support for legacy transition
  dmaengine: pxa_dma: add debug information
  dmaengine: pxa: add pxa dmaengine driver
  ...

dmaengine: rcar-dmac: Use DECLARE_BITMAP

2015-05-25T17:12:10+00:00

Use the generic mechanism to declare a bitmap instead of unsigned long.

Signed-off-by: Joe Perches 
Signed-off-by: Vinod Koul

dmaengine: rcar-dmac: fixup spinlock in rcar-dmac

2015-05-22T13:14:21+00:00

Current rcar-dmac driver is using spin_lock_irq() / spin_unlock_irq()
in some functions. But, some other driver might call DMAEngine API
during interrupt disabled. In such case, rcar-dmac side spin_unlock_irq()
forcefully allows all interrupts. Therefore, other driver receives
unexpected interruption, and its exclusive access control will be broken.
This patch replaces spin_lock_irq() to spin_lock_irqsave(),
and spin_unlock_irq() to spin_unlock_irqrestore().

Reported-by: Cao Minh Hiep 
Signed-off-by: Kuninori Morimoto 
Tested-by: Keita Kobayashi 
Acked-by: Vinod Koul 
Signed-off-by: Mark Brown

dmaengine: rcar-dmac: Disable channel 0 when using IOMMU

2015-02-16T04:03:35+00:00

A still unconfirmed hardware bug prevents the IPMMU microTLB 0 to be
flushed correctly, resulting in memory corruption. DMAC 0 channel 0 is
connected to microTLB 0 on currently supported platforms, so we can't
use it with the IPMMU. As the IOMMU API operates at the device level we
can't disable it selectively, so ignore channel 0 for now if the device
is part of an IOMMU group.

Signed-off-by: Laurent Pinchart 
Acked-by: Geert Uytterhoeven 
Signed-off-by: Vinod Koul

dmaengine: rcar-dmac: Work around descriptor mode IOMMU errata

2015-02-16T04:03:34+00:00

When descriptor memory is accessed through an IOMMU the DMADAR register
isn't initialized automatically from the first descriptor at beginning
of transfer by the DMAC like it should. Initialize it manually with the
destination address of the first chunk.

Signed-off-by: Laurent Pinchart 
Acked-by: Geert Uytterhoeven 
Signed-off-by: Vinod Koul

dmaengine: rcar-dmac: Allocate hardware descriptors with DMAC device

2015-02-16T04:03:33+00:00

When wired to an IOMMU to access data, the DMAC accesses the hardware
descriptors through the IOMMU as well. We're using the DMA mapping API
to allocate the descriptors, but with a NULL device at the moment, which
prevents IOMMU mappings from being created. Fix this by passing the DMAC
device instead.

Signed-off-by: Laurent Pinchart 
Acked-by: Geert Uytterhoeven 
Signed-off-by: Vinod Koul

dmaengine: rcar-dmac: Fix oops due to unintialized list in error ISR

2015-02-16T04:03:33+00:00

The error interrupt handler stops and reinitializes all channels. This
causes a crash for channels that have never been used, as their
descriptor lists are uninitialized. Fix it by initializing the
descriptor lists at probe time.

Signed-off-by: Laurent Pinchart 
Acked-by: Geert Uytterhoeven 
Signed-off-by: Vinod Koul

dmaengine: rcar-dmac: Fix spinlock issues in interrupt

2015-02-16T04:03:32+00:00

The rcar_dmac_desc_put() function is called in interrupt context and
must thus use spin_lock_irqsave() instead of spin_lock_irq().

Signed-off-by: Laurent Pinchart 
Acked-by: Geert Uytterhoeven 
Signed-off-by: Vinod Koul

dmaengine: rcar-dmac: Fix uninitialized variable usage

2015-02-12T07:22:19+00:00

The desc variable is used uninitialized in the rcar_dmac_desc_get() and
rcar_dmac_xfer_chunk_get() functions if descriptors need to be
allocated. Fix it.

Reported-by: Dan Carpenter 
Signed-off-by: Laurent Pinchart 
Signed-off-by: Vinod Koul