diff options
Diffstat (limited to 'sound/soc/sh/rcar/dma.c')
-rw-r--r-- | sound/soc/sh/rcar/dma.c | 231 |
1 files changed, 231 insertions, 0 deletions
diff --git a/sound/soc/sh/rcar/dma.c b/sound/soc/sh/rcar/dma.c new file mode 100644 index 000000000000..37acd409e88c --- /dev/null +++ b/sound/soc/sh/rcar/dma.c @@ -0,0 +1,231 @@ +/* + * Renesas R-Car Audio DMAC support + * + * Copyright (C) 2015 Renesas Electronics Corp. + * Copyright (c) 2015 Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ +#include "rsnd.h" + +static void rsnd_dma_complete(void *data) +{ + struct rsnd_dma *dma = (struct rsnd_dma *)data; + struct rsnd_mod *mod = rsnd_dma_to_mod(dma); + struct rsnd_dai_stream *io = rsnd_mod_to_io(mod); + + /* + * Renesas sound Gen1 needs 1 DMAC, + * Gen2 needs 2 DMAC. + * In Gen2 case, it are Audio-DMAC, and Audio-DMAC-peri-peri. + * But, Audio-DMAC-peri-peri doesn't have interrupt, + * and this driver is assuming that here. + * + * If Audio-DMAC-peri-peri has interrpt, + * rsnd_dai_pointer_update() will be called twice, + * ant it will breaks io->byte_pos + */ + + rsnd_dai_pointer_update(io, io->byte_per_period); +} + +#define DMA_NAME_SIZE 16 +#define MOD_MAX 4 /* MEM/SSI/SRC/DVC */ +static int _rsnd_dma_of_name(char *dma_name, struct rsnd_mod *mod) +{ + if (mod) + return snprintf(dma_name, DMA_NAME_SIZE / 2, "%s%d", + rsnd_mod_dma_name(mod), rsnd_mod_id(mod)); + else + return snprintf(dma_name, DMA_NAME_SIZE / 2, "mem"); + +} + +static void rsnd_dma_of_name(struct rsnd_mod *mod_from, + struct rsnd_mod *mod_to, + char *dma_name) +{ + int index = 0; + + index = _rsnd_dma_of_name(dma_name + index, mod_from); + *(dma_name + index++) = '_'; + index = _rsnd_dma_of_name(dma_name + index, mod_to); +} + +void rsnd_dma_stop(struct rsnd_dma *dma) +{ + dmaengine_terminate_all(dma->chan); +} + +void rsnd_dma_start(struct rsnd_dma *dma) +{ + struct rsnd_mod *mod = rsnd_dma_to_mod(dma); + struct rsnd_priv *priv = rsnd_mod_to_priv(mod); + struct rsnd_dai_stream *io = rsnd_mod_to_io(mod); + struct snd_pcm_substream *substream = io->substream; + struct device *dev = rsnd_priv_to_dev(priv); + struct dma_async_tx_descriptor *desc; + + desc = dmaengine_prep_dma_cyclic(dma->chan, + (dma->addr) ? dma->addr : + substream->runtime->dma_addr, + snd_pcm_lib_buffer_bytes(substream), + snd_pcm_lib_period_bytes(substream), + dma->dir, + DMA_PREP_INTERRUPT | DMA_CTRL_ACK); + + if (!desc) { + dev_err(dev, "dmaengine_prep_slave_sg() fail\n"); + return; + } + + desc->callback = rsnd_dma_complete; + desc->callback_param = dma; + + if (dmaengine_submit(desc) < 0) { + dev_err(dev, "dmaengine_submit() fail\n"); + return; + } + + dma_async_issue_pending(dma->chan); +} + +static void rsnd_dma_of_path(struct rsnd_dma *dma, + int is_play, + struct rsnd_mod **mod_from, + struct rsnd_mod **mod_to); + +int rsnd_dma_init(struct rsnd_priv *priv, struct rsnd_dma *dma, int id) +{ + struct device *dev = rsnd_priv_to_dev(priv); + struct dma_slave_config cfg = {}; + struct rsnd_mod *mod = rsnd_dma_to_mod(dma); + struct rsnd_mod *mod_from; + struct rsnd_mod *mod_to; + struct rsnd_dai_stream *io = rsnd_mod_to_io(mod); + int is_play = rsnd_io_is_play(io); + char dma_name[DMA_NAME_SIZE]; + dma_cap_mask_t mask; + int ret; + + if (dma->chan) { + dev_err(dev, "it already has dma channel\n"); + return -EIO; + } + + dma_cap_zero(mask); + dma_cap_set(DMA_SLAVE, mask); + + rsnd_dma_of_path(dma, is_play, &mod_from, &mod_to); + rsnd_dma_of_name(mod_from, mod_to, dma_name); + + cfg.direction = is_play ? DMA_MEM_TO_DEV : DMA_DEV_TO_MEM; + cfg.src_addr = rsnd_gen_dma_addr(priv, mod_from, is_play, 1); + cfg.dst_addr = rsnd_gen_dma_addr(priv, mod_to, is_play, 0); + cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; + cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; + + dev_dbg(dev, "dma : %s %pad -> %pad\n", + dma_name, &cfg.src_addr, &cfg.dst_addr); + + dma->chan = dma_request_slave_channel_compat(mask, shdma_chan_filter, + (void *)id, dev, + dma_name); + if (!dma->chan) { + dev_err(dev, "can't get dma channel\n"); + goto rsnd_dma_channel_err; + } + + ret = dmaengine_slave_config(dma->chan, &cfg); + if (ret < 0) + goto rsnd_dma_init_err; + + dma->addr = is_play ? cfg.src_addr : cfg.dst_addr; + dma->dir = is_play ? DMA_MEM_TO_DEV : DMA_DEV_TO_MEM; + + return 0; + +rsnd_dma_init_err: + rsnd_dma_quit(dma); +rsnd_dma_channel_err: + + /* + * DMA failed. try to PIO mode + * see + * rsnd_ssi_fallback() + * rsnd_rdai_continuance_probe() + */ + return -EAGAIN; +} + +void rsnd_dma_quit(struct rsnd_dma *dma) +{ + if (dma->chan) + dma_release_channel(dma->chan); + + dma->chan = NULL; +} + +static void rsnd_dma_of_path(struct rsnd_dma *dma, + int is_play, + struct rsnd_mod **mod_from, + struct rsnd_mod **mod_to) +{ + struct rsnd_mod *this = rsnd_dma_to_mod(dma); + struct rsnd_dai_stream *io = rsnd_mod_to_io(this); + struct rsnd_mod *ssi = rsnd_io_to_mod_ssi(io); + struct rsnd_mod *src = rsnd_io_to_mod_src(io); + struct rsnd_mod *dvc = rsnd_io_to_mod_dvc(io); + struct rsnd_mod *mod[MOD_MAX]; + int i, index; + + + for (i = 0; i < MOD_MAX; i++) + mod[i] = NULL; + + /* + * in play case... + * + * src -> dst + * + * mem -> SSI + * mem -> SRC -> SSI + * mem -> SRC -> DVC -> SSI + */ + mod[0] = NULL; /* for "mem" */ + index = 1; + for (i = 1; i < MOD_MAX; i++) { + if (!src) { + mod[i] = ssi; + } else if (!dvc) { + mod[i] = src; + src = NULL; + } else { + if ((!is_play) && (this == src)) + this = dvc; + + mod[i] = (is_play) ? src : dvc; + i++; + mod[i] = (is_play) ? dvc : src; + src = NULL; + dvc = NULL; + } + + if (mod[i] == this) + index = i; + + if (mod[i] == ssi) + break; + } + + if (is_play) { + *mod_from = mod[index - 1]; + *mod_to = mod[index]; + } else { + *mod_from = mod[index]; + *mod_to = mod[index - 1]; + } +} + |