[U-Boot] [U-Boot PATCH v2 08/10] dma: ti-edma3: Add helper function to support edma3 transfer

[Jagan Teki]

On 30 July 2015 at 11:04, Vignesh R <vigneshr at ti.com> wrote:
> Signed-off-by: Vignesh R <vigneshr at ti.com>

Reviewed-by: Jagan Teki <jteki at openedev.com>

> ---
>  arch/arm/include/asm/ti-common/ti-edma3.h |  2 +
>  drivers/dma/ti-edma3.c                    | 78 +++++++++++++++++++++++++++++++
>  2 files changed, 80 insertions(+)
>
> diff --git a/arch/arm/include/asm/ti-common/ti-edma3.h b/arch/arm/include/asm/ti-common/ti-edma3.h
> index 5adc1dac0e65..6a7a321c1bdf 100644
> --- a/arch/arm/include/asm/ti-common/ti-edma3.h
> +++ b/arch/arm/include/asm/ti-common/ti-edma3.h
> @@ -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
> diff --git a/drivers/dma/ti-edma3.c b/drivers/dma/ti-edma3.c
> index 8184ded9fa81..d6a427f2e21d 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))
> +               ;

Can't we do with proper timeout, status from reg or some thing.

> +       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);
> +       }
> +}
> --
> 2.5.0
>

thanks!
-- 
Jagan | openedev.