diff options
| -rw-r--r-- | drivers/dma/caam_dma.c | 27 |
1 files changed, 19 insertions, 8 deletions
diff --git a/drivers/dma/caam_dma.c b/drivers/dma/caam_dma.c index 0d837ad..cc9f9cf 100644 --- a/drivers/dma/caam_dma.c +++ b/drivers/dma/caam_dma.c @@ -25,6 +25,14 @@ #define DESC_DMA_MEMCPY_LEN ((CAAM_DESC_BYTES_MAX - DESC_JOB_IO_LEN) / \ CAAM_CMD_SZ) +/* This is max chunk size of a DMA transfer. If a buffer is larger than this + * value it is internally broken into chunks of max CAAM_DMA_CHUNK_SIZE bytes + * and for each chunk a DMA transfer request is issued. + * This value is the largest number on 16 bits that is a multiple of 256 bytes + * (the largest configurable CAAM DMA burst size). + */ +#define CAAM_DMA_CHUNK_SIZE 65280 + struct caam_dma_sh_desc { u32 desc[DESC_DMA_MEMCPY_LEN] ____cacheline_aligned; dma_addr_t desc_dma; @@ -345,8 +353,11 @@ static void set_caam_dma_desc(u32 *desc) /* dma shared descriptor */ init_sh_desc(desc, HDR_SHARE_NEVER | (1 << HDR_START_IDX_SHIFT)); - /* REG0 = SEQINLEN - 65472 */ - append_math_sub_imm_u32(desc, REG0, SEQINLEN, IMM, 65472); + /* REG1 = CAAM_DMA_CHUNK_SIZE */ + append_math_add_imm_u32(desc, REG1, ZERO, IMM, CAAM_DMA_CHUNK_SIZE); + + /* REG0 = SEQINLEN - CAAM_DMA_CHUNK_SIZE */ + append_math_sub_imm_u32(desc, REG0, SEQINLEN, IMM, CAAM_DMA_CHUNK_SIZE); /* if (REG0 > 0) * jmp to LABEL1 @@ -354,17 +365,17 @@ static void set_caam_dma_desc(u32 *desc) jmp_cmd = append_jump(desc, JUMP_TEST_INVALL | JUMP_COND_MATH_N | JUMP_COND_MATH_Z); - /* REG0 = SEQINLEN */ - append_math_sub(desc, REG0, SEQINLEN, ZERO, CAAM_CMD_SZ); + /* REG1 = SEQINLEN */ + append_math_sub(desc, REG1, SEQINLEN, ZERO, CAAM_CMD_SZ); /* LABEL1 */ set_jump_tgt_here(desc, jmp_cmd); - /* VARSEQINLEN = REG0 */ - append_math_add(desc, VARSEQINLEN, REG0, ZERO, CAAM_CMD_SZ); + /* VARSEQINLEN = REG1 */ + append_math_add(desc, VARSEQINLEN, REG1, ZERO, CAAM_CMD_SZ); - /* VARSEQOUTLEN = REG0 */ - append_math_add(desc, VARSEQOUTLEN, REG0, ZERO, CAAM_CMD_SZ); + /* VARSEQOUTLEN = REG1 */ + append_math_add(desc, VARSEQOUTLEN, REG1, ZERO, CAAM_CMD_SZ); /* do FIFO STORE */ append_seq_fifo_store(desc, 0, FIFOST_TYPE_METADATA | LDST_VLF); |