BAM custom mapping mainly adds per SG BAM specific flag support
which cannot be implemented with generic SG mapping function.
For each SG, it checks for dma_flags and set the same in
bam_async_desc.
Signed-off-by: Abhishek Sahu <absahu@xxxxxxxxxxxxxx>
---
drivers/dma/qcom/bam_dma.c | 92 +++++++++++++++++++++++++++++++++++++++-
include/linux/dma/qcom_bam_dma.h | 13 ++++++
2 files changed, 103 insertions(+), 2 deletions(-)
diff --git a/drivers/dma/qcom/bam_dma.c b/drivers/dma/qcom/bam_dma.c
index 7078a4d..521ef45 100644
--- a/drivers/dma/qcom/bam_dma.c
+++ b/drivers/dma/qcom/bam_dma.c
@@ -615,7 +615,7 @@ static struct dma_async_tx_descriptor *bam_prep_slave_sg(struct dma_chan *chan,
for_each_sg(sgl, sg, sg_len, i)
num_alloc += DIV_ROUND_UP(sg_dma_len(sg), BAM_FIFO_SIZE);
- /* allocate enough room to accomodate the number of entries */
+ /* allocate enough room to accommodate the number of entries */
async_desc = kzalloc(sizeof(*async_desc) +
(num_alloc * sizeof(struct bam_desc_hw)), GFP_NOWAIT);
@@ -666,6 +666,92 @@ static struct dma_async_tx_descriptor *bam_prep_slave_sg(struct dma_chan *chan,
}
/**
+ * bam_prep_dma_custom_mapping - Prep DMA descriptor from custom data
+ *
+ * @chan: dma channel
+ * @data: custom data
+ * @flags: DMA flags
+ */
+static struct dma_async_tx_descriptor *bam_prep_dma_custom_mapping(
+ struct dma_chan *chan,
+ void *data, unsigned long flags)
+{
+ struct bam_chan *bchan = to_bam_chan(chan);
+ struct bam_device *bdev = bchan->bdev;
+ struct bam_async_desc *async_desc;
+ struct qcom_bam_custom_data *desc_data = data;
+ u32 i;
+ struct bam_desc_hw *desc;
+ unsigned int num_alloc = 0;
+
+ if (!is_slave_direction(desc_data->dir)) {
+ dev_err(bdev->dev, "invalid dma direction\n");
+ return NULL;
+ }
+
+ /* calculate number of required entries */
+ for (i = 0; i < desc_data->sgl_cnt; i++)
+ num_alloc += DIV_ROUND_UP(
+ sg_dma_len(&desc_data->bam_sgl[i].sgl), BAM_FIFO_SIZE);
+
+ /* allocate enough room to accommodate the number of entries */
+ async_desc = kzalloc(sizeof(*async_desc) +
+ (num_alloc * sizeof(struct bam_desc_hw)), GFP_NOWAIT);
+
+ if (!async_desc)
+ goto err_out;
+
+ if (flags & DMA_PREP_FENCE)
+ async_desc->flags |= DESC_FLAG_NWD;
+
+ if (flags & DMA_PREP_INTERRUPT)
+ async_desc->flags |= DESC_FLAG_EOT;
+ else
+ async_desc->flags |= DESC_FLAG_INT;
+
+ async_desc->num_desc = num_alloc;
+ async_desc->curr_desc = async_desc->desc;
+ async_desc->dir = desc_data->dir;
+
+ /* fill in temporary descriptors */
+ desc = async_desc->desc;
+ for (i = 0; i < desc_data->sgl_cnt; i++) {
+ unsigned int remainder;
+ unsigned int curr_offset = 0;
+
+ remainder = sg_dma_len(&desc_data->bam_sgl[i].sgl);
+
+ do {
+ desc->addr = cpu_to_le32(
+ sg_dma_address(&desc_data->bam_sgl[i].sgl) +
+ curr_offset);
+
+ if (desc_data->bam_sgl[i].dma_flags)
+ desc->flags |= cpu_to_le16(
+ desc_data->bam_sgl[i].dma_flags);
+
+ if (remainder > BAM_FIFO_SIZE) {
+ desc->size = cpu_to_le16(BAM_FIFO_SIZE);
+ remainder -= BAM_FIFO_SIZE;
+ curr_offset += BAM_FIFO_SIZE;
+ } else {
+ desc->size = cpu_to_le16(remainder);
+ remainder = 0;
+ }
+
+ async_desc->length += desc->size;
+ desc++;
+ } while (remainder > 0);
+ }
+
+ return vchan_tx_prep(&bchan->vc, &async_desc->vd, flags);
+
+err_out:
+ kfree(async_desc);
+ return NULL;
+}
+
+/**
* bam_dma_terminate_all - terminate all transactions on a channel
* @bchan: bam dma channel
*
@@ -956,7 +1042,7 @@ static void bam_start_dma(struct bam_chan *bchan)
/* set any special flags on the last descriptor */
if (async_desc->num_desc == async_desc->xfer_len)
- desc[async_desc->xfer_len - 1].flags =
+ desc[async_desc->xfer_len - 1].flags |=
cpu_to_le16(async_desc->flags);
else
desc[async_desc->xfer_len - 1].flags |=
@@ -1233,6 +1319,8 @@ static int bam_dma_probe(struct platform_device *pdev)
bdev->common.device_alloc_chan_resources = bam_alloc_chan;
bdev->common.device_free_chan_resources = bam_free_chan;
bdev->common.device_prep_slave_sg = bam_prep_slave_sg;
+ bdev->common.device_prep_dma_custom_mapping =
+ bam_prep_dma_custom_mapping;
bdev->common.device_config = bam_slave_config;
bdev->common.device_pause = bam_pause;
bdev->common.device_resume = bam_resume;
diff --git a/include/linux/dma/qcom_bam_dma.h b/include/linux/dma/qcom_bam_dma.h
index 2307c4d..46344cf 100644
--- a/include/linux/dma/qcom_bam_dma.h
+++ b/include/linux/dma/qcom_bam_dma.h
@@ -36,6 +36,19 @@ struct qcom_bam_sgl {
};
/*
+ * QCOM BAM DMA custom data
+ *
+ * @sgl_cnt: number of sgl in bam_sgl
+ * @dir: DMA data transfer direction
+ * @bam_sgl: BAM SGL pointer
+ */
+struct qcom_bam_custom_data {
+ u32 sgl_cnt;
+ enum dma_transfer_direction dir;
+ struct qcom_bam_sgl *bam_sgl;
+};
+
+/*
* qcom_bam_sg_init_table - Init QCOM BAM SGL
* @bam_sgl: bam sgl
* @nents: number of entries in bam sgl
--
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