From 664ab2c992d1e06c4381f66c93d2e155fc7722e1 Mon Sep 17 00:00:00 2001 From: Vignesh R Date: Mon, 17 Aug 2015 13:29:55 +0530 Subject: dma: ti-edma3: Add helper function to support edma3 transfer Signed-off-by: Vignesh R Reviewed-by: Jagan Teki --- drivers/dma/ti-edma3.c | 78 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 78 insertions(+) (limited to 'drivers/dma') diff --git a/drivers/dma/ti-edma3.c b/drivers/dma/ti-edma3.c index 8184ded9fa..d6a427f2e2 100644 --- a/drivers/dma/ti-edma3.c +++ b/drivers/dma/ti-edma3.c @@ -382,3 +382,81 @@ void qedma3_stop(u32 base, struct edma3_channel_config *cfg) /* Clear the channel map */ __raw_writel(0, base + EDMA3_QCHMAP(cfg->chnum)); } + +void edma3_transfer(unsigned long edma3_base_addr, unsigned int + edma_slot_num, void *dst, void *src, size_t len) +{ + struct edma3_slot_config slot; + struct edma3_channel_config edma_channel; + int b_cnt_value = 1; + int rem_bytes = 0; + int a_cnt_value = len; + unsigned int addr = (unsigned int) (dst); + unsigned int max_acnt = 0x7FFFU; + + if (len > max_acnt) { + b_cnt_value = (len / max_acnt); + rem_bytes = (len % max_acnt); + a_cnt_value = max_acnt; + } + + slot.opt = 0; + slot.src = ((unsigned int) src); + slot.acnt = a_cnt_value; + slot.bcnt = b_cnt_value; + slot.ccnt = 1; + slot.src_bidx = a_cnt_value; + slot.dst_bidx = a_cnt_value; + slot.src_cidx = 0; + slot.dst_cidx = 0; + slot.link = EDMA3_PARSET_NULL_LINK; + slot.bcntrld = 0; + slot.opt = EDMA3_SLOPT_TRANS_COMP_INT_ENB | + EDMA3_SLOPT_COMP_CODE(0) | + EDMA3_SLOPT_STATIC | EDMA3_SLOPT_AB_SYNC; + + edma3_slot_configure(edma3_base_addr, edma_slot_num, &slot); + edma_channel.slot = edma_slot_num; + edma_channel.chnum = 0; + edma_channel.complete_code = 0; + /* set event trigger to dst update */ + edma_channel.trigger_slot_word = EDMA3_TWORD(dst); + + qedma3_start(edma3_base_addr, &edma_channel); + edma3_set_dest_addr(edma3_base_addr, edma_channel.slot, addr); + + while (edma3_check_for_transfer(edma3_base_addr, &edma_channel)) + ; + qedma3_stop(edma3_base_addr, &edma_channel); + + if (rem_bytes != 0) { + slot.opt = 0; + slot.src = + (b_cnt_value * max_acnt) + ((unsigned int) src); + slot.acnt = rem_bytes; + slot.bcnt = 1; + slot.ccnt = 1; + slot.src_bidx = rem_bytes; + slot.dst_bidx = rem_bytes; + slot.src_cidx = 0; + slot.dst_cidx = 0; + slot.link = EDMA3_PARSET_NULL_LINK; + slot.bcntrld = 0; + slot.opt = EDMA3_SLOPT_TRANS_COMP_INT_ENB | + EDMA3_SLOPT_COMP_CODE(0) | + EDMA3_SLOPT_STATIC | EDMA3_SLOPT_AB_SYNC; + edma3_slot_configure(edma3_base_addr, edma_slot_num, &slot); + edma_channel.slot = edma_slot_num; + edma_channel.chnum = 0; + edma_channel.complete_code = 0; + /* set event trigger to dst update */ + edma_channel.trigger_slot_word = EDMA3_TWORD(dst); + + qedma3_start(edma3_base_addr, &edma_channel); + edma3_set_dest_addr(edma3_base_addr, edma_channel.slot, addr + + (max_acnt * b_cnt_value)); + while (edma3_check_for_transfer(edma3_base_addr, &edma_channel)) + ; + qedma3_stop(edma3_base_addr, &edma_channel); + } +} -- cgit v1.2.1