From: Tero Kristo t-kristo@ti.com
Add support for simple memory fill operation. With large data sizes it is much faster to use EDMA for memory fill rather than CPU.
Signed-off-by: Tero Kristo t-kristo@ti.com Signed-off-by: Lokesh Vutla lokeshvutla@ti.com --- arch/arm/include/asm/ti-common/ti-edma3.h | 2 ++ drivers/dma/ti-edma3.c | 55 +++++++++++++++++++++++++++---- 2 files changed, 50 insertions(+), 7 deletions(-)
diff --git a/arch/arm/include/asm/ti-common/ti-edma3.h b/arch/arm/include/asm/ti-common/ti-edma3.h index 6a7a321c1b..3f41d34a7a 100644 --- a/arch/arm/include/asm/ti-common/ti-edma3.h +++ b/arch/arm/include/asm/ti-common/ti-edma3.h @@ -119,5 +119,7 @@ void edma3_set_transfer_params(u32 base, int slot, int acnt, enum edma3_sync_dimension sync_mode); void edma3_transfer(unsigned long edma3_base_addr, unsigned int edma_slot_num, void *dst, void *src, size_t len); +void edma3_fill(unsigned long edma3_base_addr, unsigned int edma_slot_num, + void *dst, u8 val, size_t len);
#endif diff --git a/drivers/dma/ti-edma3.c b/drivers/dma/ti-edma3.c index 635eb7876d..852c9e1fd7 100644 --- a/drivers/dma/ti-edma3.c +++ b/drivers/dma/ti-edma3.c @@ -34,10 +34,14 @@ #define EDMA3_QEESR 0x108c #define EDMA3_QSECR 0x1094
+#define EDMA_FILL_BUFFER_SIZE 512 + struct ti_edma3_priv { u32 base; };
+static u8 edma_fill_buffer[EDMA_FILL_BUFFER_SIZE] __aligned(ARCH_DMA_MINALIGN); + /** * qedma3_start - start qdma on a channel * @base: base address of edma @@ -391,7 +395,7 @@ void qedma3_stop(u32 base, struct edma3_channel_config *cfg) }
void __edma3_transfer(unsigned long edma3_base_addr, unsigned int edma_slot_num, - void *dst, void *src, size_t len) + void *dst, void *src, size_t len, size_t s_len) { struct edma3_slot_config slot; struct edma3_channel_config edma_channel; @@ -401,7 +405,11 @@ void __edma3_transfer(unsigned long edma3_base_addr, unsigned int edma_slot_num, unsigned int addr = (unsigned int) (dst); unsigned int max_acnt = 0x7FFFU;
- if (len > max_acnt) { + if (len > s_len) { + b_cnt_value = (len / s_len); + rem_bytes = (len % s_len); + a_cnt_value = s_len; + } else if (len > max_acnt) { b_cnt_value = (len / max_acnt); rem_bytes = (len % max_acnt); a_cnt_value = max_acnt; @@ -412,7 +420,10 @@ void __edma3_transfer(unsigned long edma3_base_addr, unsigned int edma_slot_num, slot.acnt = a_cnt_value; slot.bcnt = b_cnt_value; slot.ccnt = 1; - slot.src_bidx = a_cnt_value; + if (len == s_len) + slot.src_bidx = a_cnt_value; + else + slot.src_bidx = 0; slot.dst_bidx = a_cnt_value; slot.src_cidx = 0; slot.dst_cidx = 0; @@ -438,8 +449,11 @@ void __edma3_transfer(unsigned long edma3_base_addr, unsigned int edma_slot_num,
if (rem_bytes != 0) { slot.opt = 0; - slot.src = - (b_cnt_value * max_acnt) + ((unsigned int) src); + if (len == s_len) + slot.src = + (b_cnt_value * max_acnt) + ((unsigned int) src); + else + slot.src = (unsigned int) src; slot.acnt = rem_bytes; slot.bcnt = 1; slot.ccnt = 1; @@ -468,12 +482,39 @@ void __edma3_transfer(unsigned long edma3_base_addr, unsigned int edma_slot_num, } }
+void __edma3_fill(unsigned long edma3_base_addr, unsigned int edma_slot_num, + void *dst, u8 val, size_t len) +{ + int xfer_len; + int max_xfer = EDMA_FILL_BUFFER_SIZE * 65535; + + memset((void *)edma_fill_buffer, val, sizeof(edma_fill_buffer)); + + while (len) { + xfer_len = len; + if (xfer_len > max_xfer) + xfer_len = max_xfer; + + __edma3_transfer(edma3_base_addr, edma_slot_num, dst, + edma_fill_buffer, xfer_len, + EDMA_FILL_BUFFER_SIZE); + len -= xfer_len; + dst += xfer_len; + } +} + #ifndef CONFIG_DMA
void edma3_transfer(unsigned long edma3_base_addr, unsigned int edma_slot_num, void *dst, void *src, size_t len) { - __edma3_transfer(edma3_base_addr, edma_slot_num, dst, src, len); + __edma3_transfer(edma3_base_addr, edma_slot_num, dst, src, len, len); +} + +void edma3_fill(unsigned long edma3_base_addr, unsigned int edma_slot_num, + void *dst, u8 val, size_t len) +{ + __edma3_fill(edma3_base_addr, edma_slot_num, dst, val, len); }
#else @@ -488,7 +529,7 @@ static int ti_edma3_transfer(struct udevice *dev, int direction, void *dst,
switch (direction) { case DMA_MEM_TO_MEM: - __edma3_transfer(priv->base, 1, dst, src, len); + __edma3_transfer(priv->base, 1, dst, src, len, len); break; default: pr_err("Transfer type not implemented in DMA driver\n");