On Fri, Apr 22, 2016 at 08:49:55AM +0200, Jean-Francois Moine wrote:
> DMA cyclic transfers are required by audio streaming.
>
> Acked-by: Maxime Ripard <maxime.rip...@free-electrons.com>
> Signed-off-by: Jean-Francois Moine <moin...@free.fr>
> ---
> drivers/dma/sun6i-dma.c | 129
> +++++++++++++++++++++++++++++++++++++++++++++---
> 1 file changed, 122 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/dma/sun6i-dma.c b/drivers/dma/sun6i-dma.c
> index 821fc4f..f0c4a53 100644
> --- a/drivers/dma/sun6i-dma.c
> +++ b/drivers/dma/sun6i-dma.c
> @@ -146,6 +146,8 @@ struct sun6i_vchan {
> struct dma_slave_config cfg;
> struct sun6i_pchan *phy;
> u8 port;
> + u8 irq_type;
> + bool cyclic;
> };
>
> struct sun6i_dma_dev {
> @@ -254,6 +256,30 @@ static inline s8 convert_buswidth(enum
> dma_slave_buswidth addr_width)
> return addr_width >> 1;
> }
>
> +static size_t sun6i_get_chan_size(struct sun6i_pchan *pchan)
> +{
> + struct sun6i_desc *txd = pchan->desc;
> + struct sun6i_dma_lli *lli;
> + size_t bytes;
> + dma_addr_t pos;
> +
> + pos = readl(pchan->base + DMA_CHAN_LLI_ADDR);
> + bytes = readl(pchan->base + DMA_CHAN_CUR_CNT);
> +
> + if (pos == LLI_LAST_ITEM)
> + return bytes;
> +
> + for (lli = txd->v_lli; lli; lli = lli->v_lli_next) {
> + if (lli->p_lli_next == pos) {
> + for (lli = lli->v_lli_next; lli; lli = lli->v_lli_next)
> + bytes += lli->len;
> + break;
> + }
> + }
> +
> + return bytes;
> +}
> +
> static void *sun6i_dma_lli_add(struct sun6i_dma_lli *prev,
> struct sun6i_dma_lli *next,
> dma_addr_t next_phy,
> @@ -342,8 +368,12 @@ static int sun6i_dma_start_desc(struct sun6i_vchan
> *vchan)
> irq_reg = pchan->idx / DMA_IRQ_CHAN_NR;
> irq_offset = pchan->idx % DMA_IRQ_CHAN_NR;
>
> + vchan->irq_type = vchan->cyclic ? DMA_IRQ_PKG : DMA_IRQ_QUEUE;
> +
> irq_val = readl(sdev->base + DMA_IRQ_EN(irq_reg));
> - irq_val |= DMA_IRQ_QUEUE << (irq_offset * DMA_IRQ_CHAN_WIDTH);
> + irq_val &= ~((DMA_IRQ_HALF | DMA_IRQ_PKG | DMA_IRQ_QUEUE) <<
> + (irq_offset * DMA_IRQ_CHAN_WIDTH));
> + irq_val |= vchan->irq_type << (irq_offset * DMA_IRQ_CHAN_WIDTH);
> writel(irq_val, sdev->base + DMA_IRQ_EN(irq_reg));
>
> writel(pchan->desc->p_lli, pchan->base + DMA_CHAN_LLI_ADDR);
> @@ -440,11 +470,12 @@ static irqreturn_t sun6i_dma_interrupt(int irq, void
> *dev_id)
> writel(status, sdev->base + DMA_IRQ_STAT(i));
>
> for (j = 0; (j < DMA_IRQ_CHAN_NR) && status; j++) {
> - if (status & DMA_IRQ_QUEUE) {
> - pchan = sdev->pchans + j;
> - vchan = pchan->vchan;
> -
> - if (vchan) {
> + pchan = sdev->pchans + j;
> + vchan = pchan->vchan;
> + if (vchan && (status & vchan->irq_type)) {
> + if (vchan->cyclic) {
> + vchan_cyclic_callback(&pchan->desc->vd);
> + } else {
> spin_lock(&vchan->vc.lock);
> vchan_cookie_complete(&pchan->desc->vd);
> pchan->done = pchan->desc;
> @@ -650,6 +681,78 @@ err_lli_free:
> return NULL;
> }
>
> +static struct dma_async_tx_descriptor *sun6i_dma_prep_dma_cyclic(
> + struct dma_chan *chan,
> + dma_addr_t buf_addr,
> + size_t buf_len,
> + size_t period_len,
> + enum dma_transfer_direction dir,
> + unsigned long flags)
> +{
> + struct sun6i_dma_dev *sdev = to_sun6i_dma_dev(chan->device);
> + struct sun6i_vchan *vchan = to_sun6i_vchan(chan);
> + struct dma_slave_config *sconfig = &vchan->cfg;
> + struct sun6i_dma_lli *v_lli, *prev = NULL;
> + struct sun6i_desc *txd;
> + dma_addr_t p_lli;
> + u32 lli_cfg;
> + unsigned int i, periods = buf_len / period_len;
> + int ret;
typically we check if direction is slave or not..
> +
> + ret = set_config(sdev, sconfig, dir, &lli_cfg);
> + if (ret) {
> + dev_err(chan2dev(chan), "Invalid DMA configuration\n");
> + return NULL;
> + }
> +
> + txd = kzalloc(sizeof(*txd), GFP_NOWAIT);
> + if (!txd)
> + return NULL;
> +
> + for (i = 0; i < periods; i++) {
> + v_lli = dma_pool_alloc(sdev->pool, GFP_NOWAIT, &p_lli);
> + if (!v_lli) {
> + dev_err(sdev->slave.dev, "Failed to alloc lli
> memory\n");
> + goto err_lli_free;
> + }
> +
> + v_lli->len = period_len;
> + v_lli->para = NORMAL_WAIT;
> +
> + if (dir == DMA_MEM_TO_DEV) {
> + v_lli->src = buf_addr + period_len * i;
> + v_lli->dst = sconfig->dst_addr;
> + v_lli->cfg = lli_cfg |
> + DMA_CHAN_CFG_DST_IO_MODE |
> + DMA_CHAN_CFG_SRC_LINEAR_MODE |
> + DMA_CHAN_CFG_SRC_DRQ(DRQ_SDRAM) |
> + DMA_CHAN_CFG_DST_DRQ(vchan->port);
> + } else {
if we check direction above, then this is fine
--
~Vinod
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