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dma: ti-edma3: Add helper function to support edma3 transfer

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Signed-off-by: Vignesh R <vigneshr@ti.com>
Reviewed-by: Jagan Teki <jteki@openedev.com>
This commit is contained in:
Vignesh R 2015-08-17 13:29:55 +05:30 committed by Jagan Teki
parent 146bad9619
commit 664ab2c992
2 changed files with 80 additions and 0 deletions
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2
arch/arm/include/asm/ti-common/ti-edma3.h
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@ -117,5 +117,7 @@ void edma3_set_src_addr(u32 base, int slot, u32 src);
void edma3_set_transfer_params(u32 base, int slot, int acnt,
int bcnt, int ccnt, u16 bcnt_rld,
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);
#endif

78
drivers/dma/ti-edma3.c
View File

@ -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);
}
}