Around Mon 27 Aug 2012 04:53:02 +0800 or thereabout, Hein Tibosch wrote: > The dw_dmac was originally developed for avr32 to be used with the > Synopsys DesignWare AHB DMA controller. After 2.6.38, device access was done > with the little-endian readl/writel functions. This didn't work on the > avr32 platform, because it needs native-endian (i.e. big-endian) accessors. > This patch makes the endianness configurable using 'DW_DMAC_BE', > which will default be true for AVR32
I think the English in kconfig could use some brushing up. > Signed-off-by: Hein Tibosch <hein_tibo...@yahoo.es> > --- > drivers/dma/Kconfig | 8 ++++++++ > drivers/dma/dw_dmac_regs.h | 23 +++++++++++++++++++++++ > 2 files changed, 31 insertions(+), 0 deletions(-) > > diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig > index aadeb5b..3635daf 100644 > --- a/drivers/dma/Kconfig > +++ b/drivers/dma/Kconfig > @@ -89,6 +89,14 @@ config DW_DMAC > Support the Synopsys DesignWare AHB DMA controller. This > can be integrated in chips such as the Atmel AT32ap7000. > > +config DW_DMAC_BE > This name isn't that long, so we could skip the abbreviation of big endian; DW_DMAC_BIG_ENDIAN_IO or something similar? > + bool "Synopsys DesignWare AHB DMA needs big endian access" > bool "Use big endian I/O register access" > + default y if AVR32 > + depends on DW_DMAC > + help > + Say yes if access to the Synopsys DesignWare AHB DMA controller > + should be big endian, such as for Atmel AT32ap7000 > + "Say yes here to use big endian I/O access when reading and writing to the DMA controller registers. This is needed on some platforms, like the Atmel AVR32 architecture. If unsure, use the default setting." <snipp patch diff> -- mvh Hans-Christian Egtvedt -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
