/* * Freescale ASRC ALSA SoC Platform (DMA) driver * * Copyright (C) 2014 Freescale Semiconductor, Inc. * * Author: Nicolin Chen <nicoleotsuka@gmail.com> * * This file is licensed under the terms of the GNU General Public License * version 2. This program is licensed "as is" without any warranty of any * kind, whether express or implied. */ #include <linux/dma-mapping.h> #include <linux/module.h> #include <linux/platform_data/dma-imx.h> #include <sound/dmaengine_pcm.h> #include <sound/pcm_params.h> #include "fsl_asrc.h" #define FSL_ASRC_DMABUF_SIZE (256 * 1024) static struct snd_pcm_hardware snd_imx_hardware = { .info = SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER | SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID | SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME, .buffer_bytes_max = FSL_ASRC_DMABUF_SIZE, .period_bytes_min = 128, .period_bytes_max = 65535, /* Limited by SDMA engine */ .periods_min = 2, .periods_max = 255, .fifo_size = 0, }; static bool filter(struct dma_chan *chan, void *param) { if (!imx_dma_is_general_purpose(chan)) return false; chan->private = param; return true; } static void fsl_asrc_dma_complete(void *arg) { struct snd_pcm_substream *substream = arg; struct snd_pcm_runtime *runtime = substream->runtime; struct fsl_asrc_pair *pair = runtime->private_data; pair->pos += snd_pcm_lib_period_bytes(substream); if (pair->pos >= snd_pcm_lib_buffer_bytes(substream)) pair->pos = 0; snd_pcm_period_elapsed(substream); } static int fsl_asrc_dma_prepare_and_submit(struct snd_pcm_substream *substream) { u8 dir = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ? OUT : IN; struct snd_soc_pcm_runtime *rtd = substream->private_data; struct snd_pcm_runtime *runtime = substream->runtime; struct fsl_asrc_pair *pair = runtime->private_data; struct device *dev = rtd->platform->dev; unsigned long flags = DMA_CTRL_ACK; /* Prepare and submit Front-End DMA channel */ if (!substream->runtime->no_period_wakeup) flags |= DMA_PREP_INTERRUPT; pair->pos = 0; pair->desc[!dir] = dmaengine_prep_dma_cyclic( pair->dma_chan[!dir], runtime->dma_addr, snd_pcm_lib_buffer_bytes(substream), snd_pcm_lib_period_bytes(substream), dir == OUT ? DMA_TO_DEVICE : DMA_FROM_DEVICE, flags); if (!pair->desc[!dir]) { dev_err(dev, "failed to prepare slave DMA for Front-End\n"); return -ENOMEM; } pair->desc[!dir]->callback = fsl_asrc_dma_complete; pair->desc[!dir]->callback_param = substream; dmaengine_submit(pair->desc[!dir]); /* Prepare and submit Back-End DMA channel */ pair->desc[dir] = dmaengine_prep_dma_cyclic( pair->dma_chan[dir], 0xffff, 64, 64, DMA_DEV_TO_DEV, 0); if (!pair->desc[dir]) { dev_err(dev, "failed to prepare slave DMA for Back-End\n"); return -ENOMEM; } dmaengine_submit(pair->desc[dir]); return 0; } static int fsl_asrc_dma_trigger(struct snd_pcm_substream *substream, int cmd) { struct snd_pcm_runtime *runtime = substream->runtime; struct fsl_asrc_pair *pair = runtime->private_data; int ret; switch (cmd) { case SNDRV_PCM_TRIGGER_START: case SNDRV_PCM_TRIGGER_RESUME: case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: ret = fsl_asrc_dma_prepare_and_submit(substream); if (ret) return ret; dma_async_issue_pending(pair->dma_chan[IN]); dma_async_issue_pending(pair->dma_chan[OUT]); break; case SNDRV_PCM_TRIGGER_STOP: case SNDRV_PCM_TRIGGER_SUSPEND: case SNDRV_PCM_TRIGGER_PAUSE_PUSH: dmaengine_terminate_all(pair->dma_chan[OUT]); dmaengine_terminate_all(pair->dma_chan[IN]); break; default: return -EINVAL; } return 0; } static int fsl_asrc_dma_hw_params(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params) { enum dma_slave_buswidth buswidth = DMA_SLAVE_BUSWIDTH_2_BYTES; struct snd_soc_pcm_runtime *rtd = substream->private_data; bool tx = substream->stream == SNDRV_PCM_STREAM_PLAYBACK; struct snd_dmaengine_dai_dma_data *dma_params_fe = NULL; struct snd_dmaengine_dai_dma_data *dma_params_be = NULL; struct snd_pcm_runtime *runtime = substream->runtime; struct fsl_asrc_pair *pair = runtime->private_data; struct fsl_asrc *asrc_priv = pair->asrc_priv; struct dma_slave_config config_fe, config_be; enum asrc_pair_index index = pair->index; struct device *dev = rtd->platform->dev; int stream = substream->stream; struct imx_dma_data *tmp_data; struct snd_soc_dpcm *dpcm; struct dma_chan *tmp_chan; struct device *dev_be; u8 dir = tx ? OUT : IN; dma_cap_mask_t mask; int ret; /* Fetch the Back-End dma_data from DPCM */ list_for_each_entry(dpcm, &rtd->dpcm[stream].be_clients, list_be) { struct snd_soc_pcm_runtime *be = dpcm->be; struct snd_pcm_substream *substream_be; struct snd_soc_dai *dai = be->cpu_dai; if (dpcm->fe != rtd) continue; substream_be = snd_soc_dpcm_get_substream(be, stream); dma_params_be = snd_soc_dai_get_dma_data(dai, substream_be); dev_be = dai->dev; break; } if (!dma_params_be) { dev_err(dev, "failed to get the substream of Back-End\n"); return -EINVAL; } /* Override dma_data of the Front-End and config its dmaengine */ dma_params_fe = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream); dma_params_fe->addr = asrc_priv->paddr + REG_ASRDx(!dir, index); dma_params_fe->maxburst = dma_params_be->maxburst; pair->dma_chan[!dir] = fsl_asrc_get_dma_channel(pair, !dir); if (!pair->dma_chan[!dir]) { dev_err(dev, "failed to request DMA channel\n"); return -EINVAL; } memset(&config_fe, 0, sizeof(config_fe)); ret = snd_dmaengine_pcm_prepare_slave_config(substream, params, &config_fe); if (ret) { dev_err(dev, "failed to prepare DMA config for Front-End\n"); return ret; } ret = dmaengine_slave_config(pair->dma_chan[!dir], &config_fe); if (ret) { dev_err(dev, "failed to config DMA channel for Front-End\n"); return ret; } /* Request and config DMA channel for Back-End */ dma_cap_zero(mask); dma_cap_set(DMA_SLAVE, mask); dma_cap_set(DMA_CYCLIC, mask); /* Get DMA request of Back-End */ tmp_chan = dma_request_slave_channel(dev_be, tx ? "tx" : "rx"); tmp_data = tmp_chan->private; pair->dma_data.dma_request = tmp_data->dma_request; dma_release_channel(tmp_chan); /* Get DMA request of Front-End */ tmp_chan = fsl_asrc_get_dma_channel(pair, dir); tmp_data = tmp_chan->private; pair->dma_data.dma_request2 = tmp_data->dma_request; pair->dma_data.peripheral_type = tmp_data->peripheral_type; pair->dma_data.priority = tmp_data->priority; dma_release_channel(tmp_chan); pair->dma_chan[dir] = dma_request_channel(mask, filter, &pair->dma_data); if (!pair->dma_chan[dir]) { dev_err(dev, "failed to request DMA channel for Back-End\n"); return -EINVAL; } if (asrc_priv->asrc_width == 16) buswidth = DMA_SLAVE_BUSWIDTH_2_BYTES; else buswidth = DMA_SLAVE_BUSWIDTH_4_BYTES; config_be.direction = DMA_DEV_TO_DEV; config_be.src_addr_width = buswidth; config_be.src_maxburst = dma_params_be->maxburst; config_be.dst_addr_width = buswidth; config_be.dst_maxburst = dma_params_be->maxburst; if (tx) { config_be.src_addr = asrc_priv->paddr + REG_ASRDO(index); config_be.dst_addr = dma_params_be->addr; } else { config_be.dst_addr = asrc_priv->paddr + REG_ASRDI(index); config_be.src_addr = dma_params_be->addr; } ret = dmaengine_slave_config(pair->dma_chan[dir], &config_be); if (ret) { dev_err(dev, "failed to config DMA channel for Back-End\n"); return ret; } snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer); return 0; } static int fsl_asrc_dma_hw_free(struct snd_pcm_substream *substream) { struct snd_pcm_runtime *runtime = substream->runtime; struct fsl_asrc_pair *pair = runtime->private_data; snd_pcm_set_runtime_buffer(substream, NULL); if (pair->dma_chan[IN]) dma_release_channel(pair->dma_chan[IN]); if (pair->dma_chan[OUT]) dma_release_channel(pair->dma_chan[OUT]); pair->dma_chan[IN] = NULL; pair->dma_chan[OUT] = NULL; return 0; } static int fsl_asrc_dma_startup(struct snd_pcm_substream *substream) { struct snd_soc_pcm_runtime *rtd = substream->private_data; struct snd_pcm_runtime *runtime = substream->runtime; struct device *dev = rtd->platform->dev; struct fsl_asrc *asrc_priv = dev_get_drvdata(dev); struct fsl_asrc_pair *pair; pair = kzalloc(sizeof(struct fsl_asrc_pair), GFP_KERNEL); if (!pair) { dev_err(dev, "failed to allocate pair\n"); return -ENOMEM; } pair->asrc_priv = asrc_priv; runtime->private_data = pair; snd_pcm_hw_constraint_integer(substream->runtime, SNDRV_PCM_HW_PARAM_PERIODS); snd_soc_set_runtime_hwparams(substream, &snd_imx_hardware); return 0; } static int fsl_asrc_dma_shutdown(struct snd_pcm_substream *substream) { struct snd_pcm_runtime *runtime = substream->runtime; struct fsl_asrc_pair *pair = runtime->private_data; struct fsl_asrc *asrc_priv; if (!pair) return 0; asrc_priv = pair->asrc_priv; if (asrc_priv->pair[pair->index] == pair) asrc_priv->pair[pair->index] = NULL; kfree(pair); return 0; } static snd_pcm_uframes_t fsl_asrc_dma_pcm_pointer(struct snd_pcm_substream *substream) { struct snd_pcm_runtime *runtime = substream->runtime; struct fsl_asrc_pair *pair = runtime->private_data; return bytes_to_frames(substream->runtime, pair->pos); } static const struct snd_pcm_ops fsl_asrc_dma_pcm_ops = { .ioctl = snd_pcm_lib_ioctl, .hw_params = fsl_asrc_dma_hw_params, .hw_free = fsl_asrc_dma_hw_free, .trigger = fsl_asrc_dma_trigger, .open = fsl_asrc_dma_startup, .close = fsl_asrc_dma_shutdown, .pointer = fsl_asrc_dma_pcm_pointer, }; static int fsl_asrc_dma_pcm_new(struct snd_soc_pcm_runtime *rtd) { struct snd_card *card = rtd->card->snd_card; struct snd_pcm_substream *substream; struct snd_pcm *pcm = rtd->pcm; int ret, i; ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32)); if (ret) { dev_err(card->dev, "failed to set DMA mask\n"); return ret; } for (i = SNDRV_PCM_STREAM_PLAYBACK; i <= SNDRV_PCM_STREAM_LAST; i++) { substream = pcm->streams[i].substream; if (!substream) continue; ret = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, pcm->card->dev, FSL_ASRC_DMABUF_SIZE, &substream->dma_buffer); if (ret) { dev_err(card->dev, "failed to allocate DMA buffer\n"); goto err; } } return 0; err: if (--i == 0 && pcm->streams[i].substream) snd_dma_free_pages(&pcm->streams[i].substream->dma_buffer); return ret; } static void fsl_asrc_dma_pcm_free(struct snd_pcm *pcm) { struct snd_pcm_substream *substream; int i; for (i = SNDRV_PCM_STREAM_PLAYBACK; i <= SNDRV_PCM_STREAM_LAST; i++) { substream = pcm->streams[i].substream; if (!substream) continue; snd_dma_free_pages(&substream->dma_buffer); substream->dma_buffer.area = NULL; substream->dma_buffer.addr = 0; } } struct snd_soc_platform_driver fsl_asrc_platform = { .ops = &fsl_asrc_dma_pcm_ops, .pcm_new = fsl_asrc_dma_pcm_new, .pcm_free = fsl_asrc_dma_pcm_free, }; EXPORT_SYMBOL_GPL(fsl_asrc_platform);