diff options
Diffstat (limited to 'arch/tile/include/arch/trio.h')
-rw-r--r-- | arch/tile/include/arch/trio.h | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/arch/tile/include/arch/trio.h b/arch/tile/include/arch/trio.h index d3000a871a21..c0ddedcae085 100644 --- a/arch/tile/include/arch/trio.h +++ b/arch/tile/include/arch/trio.h @@ -23,6 +23,45 @@ #ifndef __ASSEMBLER__ /* + * Map SQ Doorbell Format. + * This describes the format of the write-only doorbell register that exists + * in the last 8-bytes of the MAP_SQ_BASE/LIM range. This register is only + * writable from PCIe space. Writes to this register will not be written to + * Tile memory space and thus no IO VA translation is required if the last + * page of the BASE/LIM range is not otherwise written. + */ + +__extension__ +typedef union +{ + struct + { +#ifndef __BIG_ENDIAN__ + /* + * When written with a 1, the associated MAP_SQ region's doorbell + * interrupt will be triggered once all previous writes are visible to + * Tile software. + */ + uint_reg_t doorbell : 1; + /* + * When written with a 1, the descriptor at the head of the associated + * MAP_SQ's FIFO will be dequeued. + */ + uint_reg_t pop : 1; + /* Reserved. */ + uint_reg_t __reserved : 62; +#else /* __BIG_ENDIAN__ */ + uint_reg_t __reserved : 62; + uint_reg_t pop : 1; + uint_reg_t doorbell : 1; +#endif + }; + + uint_reg_t word; +} TRIO_MAP_SQ_DOORBELL_FMT_t; + + +/* * Tile PIO Region Configuration - CFG Address Format. * This register describes the address format for PIO accesses when the * associated region is setup with TYPE=CFG. |