Add support for HPB-DMAC found in Renesas R-Car SoCs, using 'shdma-base' DMA
driver framework.
Based on the original patch by Phil Edworthy <phil.edworthy@xxxxxxxxxxx>.
Signed-off-by: Max Filippov <max.filippov@xxxxxxxxxxxxxxxxxx>
[Sergei: removed useless #include, sorted #include's, fixed HPB_DMA_TCR_MAX,
fixed formats and removed line breaks in the dev_dbg() calls, rephrased and
added IRQ # to the shdma_request_irq() failure message, added MODULE_AUTHOR(),
fixed guard macro name in the header file, fixed #define ASYNCRSTR_ASRST20,
added #define ASYNCRSTR_ASRST24, beautified some commets.]
Signed-off-by: Sergei Shtylyov <sergei.shtylyov@xxxxxxxxxxxxxxxxxx>