static int rsnd_dmaen_start(struct rsnd_mod *mod, struct rsnd_dai_stream *io, struct rsnd_priv *priv) { struct rsnd_dma *dma = rsnd_mod_to_dma(mod); struct rsnd_dmaen *dmaen = rsnd_dma_to_dmaen(dma); struct snd_pcm_substream *substream = io->substream; struct device *dev = rsnd_priv_to_dev(priv); struct dma_async_tx_descriptor *desc; int is_play = rsnd_io_is_play(io); desc = dmaengine_prep_dma_cyclic(dmaen->chan, substream->runtime->dma_addr, snd_pcm_lib_buffer_bytes(substream), snd_pcm_lib_period_bytes(substream), is_play ? DMA_MEM_TO_DEV : DMA_DEV_TO_MEM, DMA_PREP_INTERRUPT | DMA_CTRL_ACK); if (!desc) { dev_err(dev, "dmaengine_prep_slave_sg() fail\n"); return -EIO; } desc->callback = rsnd_dmaen_complete; desc->callback_param = rsnd_mod_get(dma); if (dmaengine_submit(desc) < 0) { dev_err(dev, "dmaengine_submit() fail\n"); return -EIO; } dma_async_issue_pending(dmaen->chan); return 0; }
static int rsnd_dmaen_init(struct rsnd_dai_stream *io, struct rsnd_dma *dma, int id, struct rsnd_mod *mod_from, struct rsnd_mod *mod_to) { struct rsnd_dmaen *dmaen = rsnd_dma_to_dmaen(dma); struct rsnd_priv *priv = rsnd_io_to_priv(io); struct device *dev = rsnd_priv_to_dev(priv); struct dma_slave_config cfg = {}; int is_play = rsnd_io_is_play(io); int ret; if (dmaen->chan) { dev_err(dev, "it already has dma channel\n"); return -EIO; } if (dev->of_node) { dmaen->chan = rsnd_dmaen_request_channel(io, mod_from, mod_to); } else { dma_cap_mask_t mask; dma_cap_zero(mask); dma_cap_set(DMA_SLAVE, mask); dmaen->chan = dma_request_channel(mask, shdma_chan_filter, (void *)id); } if (IS_ERR_OR_NULL(dmaen->chan)) { dmaen->chan = NULL; dev_err(dev, "can't get dma channel\n"); goto rsnd_dma_channel_err; } cfg.direction = is_play ? DMA_MEM_TO_DEV : DMA_DEV_TO_MEM; cfg.src_addr = dma->src_addr; cfg.dst_addr = dma->dst_addr; cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; dev_dbg(dev, "dma : %pad -> %pad\n", &cfg.src_addr, &cfg.dst_addr); ret = dmaengine_slave_config(dmaen->chan, &cfg); if (ret < 0) goto rsnd_dma_init_err; return 0; rsnd_dma_init_err: rsnd_dma_quit(io, dma); rsnd_dma_channel_err: /* * DMA failed. try to PIO mode * see * rsnd_ssi_fallback() * rsnd_rdai_continuance_probe() */ return -EAGAIN; }
static void rsnd_dmaen_quit(struct rsnd_dai_stream *io, struct rsnd_dma *dma) { struct rsnd_dmaen *dmaen = rsnd_dma_to_dmaen(dma); if (dmaen->chan) dma_release_channel(dmaen->chan); dmaen->chan = NULL; }
static int rsnd_dmaen_stop(struct rsnd_mod *mod, struct rsnd_dai_stream *io, struct rsnd_priv *priv) { struct rsnd_dma *dma = rsnd_mod_to_dma(mod); struct rsnd_dmaen *dmaen = rsnd_dma_to_dmaen(dma); dmaengine_terminate_all(dmaen->chan); return 0; }
static int rsnd_dmaen_remove(struct rsnd_mod *mod, struct rsnd_dai_stream *io, struct rsnd_priv *priv) { struct rsnd_dma *dma = rsnd_mod_to_dma(mod); struct rsnd_dmaen *dmaen = rsnd_dma_to_dmaen(dma); if (dmaen->chan) dma_release_channel(dmaen->chan); dmaen->chan = NULL; return 0; }
static void rsnd_dmaen_stop(struct rsnd_dai_stream *io, struct rsnd_dma *dma) { struct rsnd_dmaen *dmaen = rsnd_dma_to_dmaen(dma); dmaengine_terminate_all(dmaen->chan); }