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drivers: dma: sam0: Implement get_status API

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Implement the get_status DMA API for the SAM0 DMA controller.
The busy field is set only when the selected channel is
actively transferring data (i.e. both enabled and selected by the
arbiter).  The direction field is left unset, since that
information is not normally retained by the DMA controller.

Signed-off-by: Derek Hageman <hageman@inthat.cloud>
This commit is contained in:
Derek Hageman 2019-05-07 18:15:41 -06:00 committed by Anas Nashif
parent d6c61513a5
commit 64e02021ee
1 changed files with 38 additions and 0 deletions
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38
drivers/dma/dma_sam0.c
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@ -356,6 +356,43 @@ inval:
return -EINVAL;
}
static int dma_sam0_get_status(struct device *dev, u32_t channel,
struct dma_status *stat)
{
struct dma_sam0_data *data = DEV_DATA(dev);
u32_t act;
if (channel >= DMAC_CH_NUM || stat == NULL) {
return -EINVAL;
}
act = DMA_REGS->ACTIVE.reg;
if ((act & DMAC_ACTIVE_ABUSY) &&
((act & DMAC_ACTIVE_ID_Msk) >> DMAC_ACTIVE_ID_Pos) == channel) {
stat->busy = true;
stat->pending_length = (act & DMAC_ACTIVE_BTCNT_Msk) >>
DMAC_ACTIVE_BTCNT_Pos;
} else {
stat->busy = false;
stat->pending_length = data->descriptors_wb[channel].BTCNT.reg;
}
switch (data->descriptors[channel].BTCTRL.bit.BEATSIZE) {
case DMAC_BTCTRL_BEATSIZE_BYTE_Val:
break;
case DMAC_BTCTRL_BEATSIZE_HWORD_Val:
stat->pending_length *= 2U;
break;
case DMAC_BTCTRL_BEATSIZE_WORD_Val:
stat->pending_length *= 4U;
break;
default:
return -EINVAL;
}
return 0;
}
DEVICE_DECLARE(dma_sam0_0);
#define DMA_SAM0_IRQ_CONNECT(n) \
@ -416,6 +453,7 @@ static const struct dma_driver_api dma_sam0_api = {
.start = dma_sam0_start,
.stop = dma_sam0_stop,
.reload = dma_sam0_reload,
.get_status = dma_sam0_get_status,
};
DEVICE_AND_API_INIT(dma_sam0_0, CONFIG_DMA_0_NAME, &dma_sam0_init,