diff options
Diffstat (limited to 'drivers/dma/mv_xor.h')
| -rw-r--r-- | drivers/dma/mv_xor.h | 28 |
1 files changed, 27 insertions, 1 deletions
diff --git a/drivers/dma/mv_xor.h b/drivers/dma/mv_xor.h index c619359cb7fe..06b067f24c9b 100644 --- a/drivers/dma/mv_xor.h +++ b/drivers/dma/mv_xor.h @@ -29,8 +29,10 @@ #define MV_XOR_THRESHOLD 1 #define MV_XOR_MAX_CHANNELS 2 +/* Values for the XOR_CONFIG register */ #define XOR_OPERATION_MODE_XOR 0 #define XOR_OPERATION_MODE_MEMCPY 2 +#define XOR_DESCRIPTOR_SWAP BIT(14) #define XOR_CURR_DESC(chan) (chan->mmr_base + 0x210 + (chan->idx * 4)) #define XOR_NEXT_DESC(chan) (chan->mmr_base + 0x200 + (chan->idx * 4)) @@ -143,7 +145,16 @@ struct mv_xor_desc_slot { #endif }; -/* This structure describes XOR descriptor size 64bytes */ +/* + * This structure describes XOR descriptor size 64bytes. The + * mv_phy_src_idx() macro must be used when indexing the values of the + * phy_src_addr[] array. This is due to the fact that the 'descriptor + * swap' feature, used on big endian systems, swaps descriptors data + * within blocks of 8 bytes. So two consecutive values of the + * phy_src_addr[] array are actually swapped in big-endian, which + * explains the different mv_phy_src_idx() implementation. + */ +#if defined(__LITTLE_ENDIAN) struct mv_xor_desc { u32 status; /* descriptor execution status */ u32 crc32_result; /* result of CRC-32 calculation */ @@ -155,6 +166,21 @@ struct mv_xor_desc { u32 reserved0; u32 reserved1; }; +#define mv_phy_src_idx(src_idx) (src_idx) +#else +struct mv_xor_desc { + u32 crc32_result; /* result of CRC-32 calculation */ + u32 status; /* descriptor execution status */ + u32 phy_next_desc; /* next descriptor address pointer */ + u32 desc_command; /* type of operation to be carried out */ + u32 phy_dest_addr; /* destination block address */ + u32 byte_count; /* size of src/dst blocks in bytes */ + u32 phy_src_addr[8]; /* source block addresses */ + u32 reserved1; + u32 reserved0; +}; +#define mv_phy_src_idx(src_idx) (src_idx ^ 1) +#endif #define to_mv_sw_desc(addr_hw_desc) \ container_of(addr_hw_desc, struct mv_xor_desc_slot, hw_desc) |