diff options
| -rw-r--r-- | sound/soc/sh/rcar/dma.c | 184 |
1 files changed, 107 insertions, 77 deletions
diff --git a/sound/soc/sh/rcar/dma.c b/sound/soc/sh/rcar/dma.c index 2f0327714625..3c663a5cfe8b 100644 --- a/sound/soc/sh/rcar/dma.c +++ b/sound/soc/sh/rcar/dma.c @@ -34,6 +34,8 @@ struct rsnd_dmapp { struct rsnd_dma { struct rsnd_mod mod; + struct rsnd_mod *mod_from; + struct rsnd_mod *mod_to; dma_addr_t src_addr; dma_addr_t dst_addr; union { @@ -92,6 +94,20 @@ static void rsnd_dmaen_complete(void *data) rsnd_mod_interrupt(mod, __rsnd_dmaen_complete); } +static struct dma_chan *rsnd_dmaen_request_channel(struct rsnd_dai_stream *io, + struct rsnd_mod *mod_from, + struct rsnd_mod *mod_to) +{ + if ((!mod_from && !mod_to) || + (mod_from && mod_to)) + return NULL; + + if (mod_from) + return rsnd_mod_dma_req(io, mod_from); + else + return rsnd_mod_dma_req(io, mod_to); +} + static int rsnd_dmaen_stop(struct rsnd_mod *mod, struct rsnd_dai_stream *io, struct rsnd_priv *priv) @@ -99,7 +115,61 @@ static int rsnd_dmaen_stop(struct rsnd_mod *mod, struct rsnd_dma *dma = rsnd_mod_to_dma(mod); struct rsnd_dmaen *dmaen = rsnd_dma_to_dmaen(dma); - dmaengine_terminate_all(dmaen->chan); + if (dmaen->chan) { + dmaengine_terminate_all(dmaen->chan); + } + + return 0; +} + +static int rsnd_dmaen_nolock_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 release uses mutex lock. + * Thus, it shouldn't be called under spinlock. + * Let's call it under nolock_start + */ + if (dmaen->chan) + dma_release_channel(dmaen->chan); + + dmaen->chan = NULL; + + return 0; +} + +static int rsnd_dmaen_nolock_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 device *dev = rsnd_priv_to_dev(priv); + + if (dmaen->chan) { + dev_err(dev, "it already has dma channel\n"); + return -EIO; + } + + /* + * DMAEngine request uses mutex lock. + * Thus, it shouldn't be called under spinlock. + * Let's call it under nolock_start + */ + dmaen->chan = rsnd_dmaen_request_channel(io, + dma->mod_from, + dma->mod_to); + if (IS_ERR_OR_NULL(dmaen->chan)) { + int ret = PTR_ERR(dmaen->chan); + + dmaen->chan = NULL; + dev_err(dev, "can't get dma channel\n"); + return ret; + } return 0; } @@ -113,7 +183,23 @@ static int rsnd_dmaen_start(struct rsnd_mod *mod, struct snd_pcm_substream *substream = io->substream; struct device *dev = rsnd_priv_to_dev(priv); struct dma_async_tx_descriptor *desc; + struct dma_slave_config cfg = {}; int is_play = rsnd_io_is_play(io); + int ret; + + 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, "%s[%d] %pad -> %pad\n", + rsnd_mod_name(mod), rsnd_mod_id(mod), + &cfg.src_addr, &cfg.dst_addr); + + ret = dmaengine_slave_config(dmaen->chan, &cfg); + if (ret < 0) + return ret; desc = dmaengine_prep_dma_cyclic(dmaen->chan, substream->runtime->dma_addr, @@ -159,97 +245,39 @@ struct dma_chan *rsnd_dma_request_channel(struct device_node *of_node, return chan; } -static struct dma_chan *rsnd_dmaen_request_channel(struct rsnd_dai_stream *io, - struct rsnd_mod *mod_from, - struct rsnd_mod *mod_to) -{ - if ((!mod_from && !mod_to) || - (mod_from && mod_to)) - return NULL; - - if (mod_from) - return rsnd_mod_dma_req(io, mod_from); - else - return rsnd_mod_dma_req(io, mod_to); -} - -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 int rsnd_dmaen_attach(struct rsnd_dai_stream *io, struct rsnd_dma *dma, struct rsnd_mod *mod_from, struct rsnd_mod *mod_to) { - struct rsnd_mod *mod = rsnd_mod_get(dma); - struct rsnd_dmaen *dmaen = rsnd_dma_to_dmaen(dma); struct rsnd_priv *priv = rsnd_io_to_priv(io); struct rsnd_dma_ctrl *dmac = rsnd_priv_to_dmac(priv); - 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; - } - - dmaen->chan = rsnd_dmaen_request_channel(io, mod_from, mod_to); - - if (IS_ERR_OR_NULL(dmaen->chan)) { - dmaen->chan = NULL; - dev_err(dev, "can't get dma channel\n"); - goto rsnd_dma_channel_err; + struct dma_chan *chan; + + /* try to get DMAEngine channel */ + chan = rsnd_dmaen_request_channel(io, mod_from, mod_to); + if (IS_ERR_OR_NULL(chan)) { + /* + * DMA failed. try to PIO mode + * see + * rsnd_ssi_fallback() + * rsnd_rdai_continuance_probe() + */ + return -EAGAIN; } - 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, "%s[%d] %pad -> %pad\n", - rsnd_mod_name(mod), rsnd_mod_id(mod), - &cfg.src_addr, &cfg.dst_addr); - - ret = dmaengine_slave_config(dmaen->chan, &cfg); - if (ret < 0) - goto rsnd_dma_attach_err; + dma_release_channel(chan); dmac->dmaen_num++; return 0; - -rsnd_dma_attach_err: - rsnd_dmaen_remove(mod, io, priv); -rsnd_dma_channel_err: - - /* - * DMA failed. try to PIO mode - * see - * rsnd_ssi_fallback() - * rsnd_rdai_continuance_probe() - */ - return -EAGAIN; } static struct rsnd_mod_ops rsnd_dmaen_ops = { .name = "audmac", + .nolock_start = rsnd_dmaen_nolock_start, + .nolock_stop = rsnd_dmaen_nolock_stop, .start = rsnd_dmaen_start, .stop = rsnd_dmaen_stop, - .remove = rsnd_dmaen_remove, }; /* @@ -671,9 +699,6 @@ int rsnd_dma_attach(struct rsnd_dai_stream *io, struct rsnd_mod *mod, *dma_mod = rsnd_mod_get(dma); - dma->src_addr = rsnd_dma_addr(io, mod_from, is_play, 1); - dma->dst_addr = rsnd_dma_addr(io, mod_to, is_play, 0); - ret = rsnd_mod_init(priv, *dma_mod, ops, NULL, rsnd_mod_get_status, type, dma_id); if (ret < 0) @@ -687,6 +712,11 @@ int rsnd_dma_attach(struct rsnd_dai_stream *io, struct rsnd_mod *mod, ret = attach(io, dma, mod_from, mod_to); if (ret < 0) return ret; + + dma->src_addr = rsnd_dma_addr(io, mod_from, is_play, 1); + dma->dst_addr = rsnd_dma_addr(io, mod_to, is_play, 0); + dma->mod_from = mod_from; + dma->mod_to = mod_to; } ret = rsnd_dai_connect(*dma_mod, io, type); |