Eric Lee / smarc-fsl-linux-kernel

02 Sep, 2016

1 commit

  • d2f5a7311   dmaengine: hsu: refactor hsu_dma_do_irq() to return int ... Browse Code »

    Since we have nice macro IRQ_RETVAL() we would use it to convert a flag of
    handled interrupt from int to irqreturn_t.

    The rationale of doing this is:
    a) hence we implicitly mark hsu_dma_do_irq() as an auxiliary function that
    can't be used as interrupt handler directly, and
    b) to be in align with serial driver which is using serial8250_handle_irq()
    that returns plain int by design.

    Signed-off-by: Andy Shevchenko
    Signed-off-by: Greg Kroah-Hartman

    Andy Shevchenko
     

31 Aug, 2016

1 commit

26 Jun, 2016

1 commit

  • c6f82787a   dmaengine: hsu: Export hsu_dma_get_status() ... Browse Code »

    To allow other code to safely read DMA Channel Status Register (where
    the register attribute for Channel Error, Descriptor Time Out &
    Descriptor Done fields are read-clear), export hsu_dma_get_status().
    hsu_dma_irq() is renamed to hsu_dma_do_irq() and requires Status
    Register value to be passed in.

    Signed-off-by: Chuah, Kim Tatt
    Acked-by: Andy Shevchenko
    Reviewed-by: Heikki Krogerus
    Signed-off-by: Greg Kroah-Hartman

    Chuah, Kim Tatt
     

17 May, 2016

1 commit

12 May, 2016

2 commits

02 May, 2016

1 commit

18 Oct, 2015

2 commits

26 May, 2015

1 commit

  • a57e16cf0   dmaengine: pxa: add pxa dmaengine driver ... Browse Code »

    This is a new driver for pxa SoCs, which is also compatible with the former
    mmp_pdma.

    The rationale behind a new driver (as opposed to incremental patching) was :

    - the new driver relies on virt-dma, which obsoletes all the internal
    structures of mmp_pdma (sw_desc, hw_desc, ...), and by consequence all the
    functions

    - mmp_pdma allocates dma coherent descriptors containing not only hardware
    descriptors but linked list information
    The new driver only puts the dma hardware descriptors (ie. 4 u32) into the
    dma pool allocated memory. This changes completely the way descriptors are
    handled

    - the architecture behind the interrupt/tasklet management was rewritten to be
    more conforming to virt-dma

    - the buffers alignment is handled differently
    The former driver assumed that the DMA channel stopped between each
    descriptor. The new one chains descriptors to let the channel running. This
    is a necessary guarantee for real-time high bandwidth usecases such as video
    capture on "old" architectures such as pxa.

    - hot chaining / cold chaining / no chaining
    Whenever possible, submitting a descriptor "hot chains" it to a running
    channel. There is still no guarantee that the descriptor will be issued, as
    the channel might be stopped just before the descriptor is submitted. Yet
    this allows to submit several video buffers, and resubmit a buffer while
    another is under handling.
    As before, dma_async_issue_pending() is the only guarantee to have all the
    buffers issued.
    When an alignment issue is detected (ie. one address in a descriptor is not
    a multiple of 8), if the already running channel is in "aligned mode", the
    channel will stop, and restarted in "misaligned mode" to finished the issued
    list.

    - descriptors reusing
    A submitted, issued and completed descriptor can be reused, ie resubmitted if
    it was prepared with the proper flag (DMA_PREP_ACK). Only a channel
    resources release will in this case release that buffer.
    This allows a rolling ring of buffers to be reused, where there are several
    thousands of hardware descriptors used (video buffer for example).

    Additionally, a set of more casual features is introduced :
    - debugging traces
    - lockless way to know if a descriptor is terminated or not

    The driver was tested on zylonite board (pxa3xx) and mioa701 (pxa27x),
    with dmatest, pxa_camera and pxamci.

    Signed-off-by: Robert Jarzmik
    Signed-off-by: Vinod Koul

    Robert Jarzmik
     

25 Apr, 2015

1 commit

  • d6a4c0e5d   Merge branch 'for-linus' of git://git.infradead.org/users/vkoul/slave-dma ... Browse Code »

    Pull slave-dmaengine updates from Vinod Koul:

    - new drivers for:
    - Ingenic JZ4780 controller
    - APM X-Gene controller
    - Freescale RaidEngine device
    - Renesas USB Controller

    - remove device_alloc_chan_resources dummy handlers

    - sh driver cleanups for peri peri and related emmc and asoc patches
    as well

    - fixes and enhancements spread over the drivers

    * 'for-linus' of git://git.infradead.org/users/vkoul/slave-dma: (59 commits)
    dmaengine: dw: don't prompt for DW_DMAC_CORE
    dmaengine: shdmac: avoid unused variable warnings
    dmaengine: fix platform_no_drv_owner.cocci warnings
    dmaengine: pch_dma: fix memory leak on failure path in pch_dma_probe()
    dmaengine: at_xdmac: unlock spin lock before return
    dmaengine: xgene: devm_ioremap() returns NULL on error
    dmaengine: xgene: buffer overflow in xgene_dma_init_channels()
    dmaengine: usb-dmac: Fix dereferencing freed memory 'desc'
    dmaengine: sa11x0: report slave capabilities to upper layers
    dmaengine: vdma: Fix compilation warnings
    dmaengine: fsl_raid: statify fsl_re_chan_probe
    dmaengine: Driver support for FSL RaidEngine device.
    dmaengine: xgene_dma_init_ring_mngr() can be static
    Documentation: dma: Add documentation for the APM X-Gene SoC DMA device DTS binding
    arm64: dts: Add APM X-Gene SoC DMA device and DMA clock DTS nodes
    dmaengine: Add support for APM X-Gene SoC DMA engine driver
    dmaengine: usb-dmac: Add Renesas USB DMA Controller (USB-DMAC) driver
    dmaengine: renesas,usb-dmac: Add device tree bindings documentation
    dmaengine: edma: fixed wrongly initialized data parameter to the edma callback
    dmaengine: ste_dma40: fix implicit conversion
    ...

    Linus Torvalds
     

17 Mar, 2015

1 commit

07 Mar, 2015

1 commit

  • 2b49e0c56   dmaengine: append hsu DMA driver ... Browse Code »

    The HSU DMA is developed to support High Speed UART controllers found in
    particular on Intel MID platforms such as Intel Medfield.

    The existing implementation is tighten to the drivers/tty/serial/mfd.c driver
    and has a lot of disadvantages. Besides that we would like to get rid of the
    old HS UART driver in regarding to extending the 8250 which supports generic
    DMAEngine API. That's why the current driver has been developed.

    Signed-off-by: Andy Shevchenko
    Signed-off-by: Greg Kroah-Hartman

    Andy Shevchenko
     

15 Oct, 2014

2 commits

  • 2a52f6e49   dmaengine: dw: export probe()/remove() and Co to users ... Browse Code »

    The driver library functions can be used directly by the compound devices such
    as ADSP or serial driver where DesignWare DMA IP is privately attached to the
    main hardware.

    Instead of creating a new platform device leaf they may call dw_dma_probe()
    with given struct dw_dma_chip directly and make sure that the main device is
    DMA capable.

    Signed-off-by: Andy Shevchenko
    Signed-off-by: Vinod Koul

    Andy Shevchenko
     
  • 3d588f83e   dmaengine: dw: split dma-dw.h to platform and private parts ... Browse Code »

    The introduced include/linux/dma/dw.h is going to contain the private
    extensions and structures which are shared for dw_dmac users in the kernel.
    Meanwhile include/linux/platform_data/dma-dw.h keeps only platform related data
    types and definitions.

    Signed-off-by: Andy Shevchenko
    Signed-off-by: Vinod Koul

    Andy Shevchenko
     

14 Aug, 2013

1 commit

  • 13b3006b8   dma: mmp_pdma: add filter function ... Browse Code »

    PXA peripherals need to obtain specific DMA request ids which will
    eventually be stored in the DRCMR register.

    Currently, clients are expected to store that number inside the slave
    config block as slave_id, which is unfortunately incompatible with the
    way DMA resources are handled in DT environments.

    This patch adds a filter function which stores the filter parameter
    passed in by of-dma.c into the channel's drcmr register.

    For backward compatability, cfg->slave_id is still used if set to
    a non-zero value.

    Signed-off-by: Daniel Mack
    Acked-by: Arnd Bergmann
    Signed-off-by: Vinod Koul

    Daniel Mack
     

15 Oct, 2012

1 commit

  • b8a6d9980   dma: ipu: rename mach/ipu.h to include/linux/dma/ipu-dma.h ... Browse Code »

    The header ipu.h really belongs to dma subsystem rather than imx
    platform. Rename it to ipu-dma.h and put it into include/linux/dma/.

    Signed-off-by: Shawn Guo
    Acked-by: Guennadi Liakhovetski
    Acked-by: Sascha Hauer
    Acked-by: Arnd Bergmann
    Cc: Vinod Koul
    Cc: Florian Tobias Schandinat
    Cc: linux-media@vger.kernel.org
    Cc: linux-fbdev@vger.kernel.org

    Shawn Guo