| // SPDX-License-Identifier: GPL-2.0 |
| // |
| // Freescale ASRC ALSA SoC Platform (DMA) driver |
| // |
| // Copyright (C) 2014 Freescale Semiconductor, Inc. |
| // |
| // Author: Nicolin Chen <nicoleotsuka@gmail.com> |
| |
| #include <linux/dma-mapping.h> |
| #include <linux/module.h> |
| #include <linux/dma/imx-dma.h> |
| #include <sound/dmaengine_pcm.h> |
| #include <sound/pcm_params.h> |
| |
| #include "fsl_asrc_common.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, |
| .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, |
| struct snd_soc_component *component) |
| { |
| u8 dir = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ? OUT : IN; |
| struct snd_pcm_runtime *runtime = substream->runtime; |
| struct fsl_asrc_pair *pair = runtime->private_data; |
| struct device *dev = component->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_MEM_TO_DEV : DMA_DEV_TO_MEM, 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_soc_component *component, |
| 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, component); |
| 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_soc_component *component, |
| 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 = asoc_substream_to_rtd(substream); |
| 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 dma_chan *tmp_chan = NULL, *be_chan = NULL; |
| struct snd_soc_component *component_be = NULL; |
| struct fsl_asrc *asrc = pair->asrc; |
| struct dma_slave_config config_fe, config_be; |
| enum asrc_pair_index index = pair->index; |
| struct device *dev = component->dev; |
| struct device_node *of_dma_node; |
| int stream = substream->stream; |
| struct imx_dma_data *tmp_data; |
| struct snd_soc_dpcm *dpcm; |
| struct device *dev_be; |
| u8 dir = tx ? OUT : IN; |
| dma_cap_mask_t mask; |
| int ret, width; |
| |
| /* Fetch the Back-End dma_data from DPCM */ |
| for_each_dpcm_be(rtd, stream, dpcm) { |
| struct snd_soc_pcm_runtime *be = dpcm->be; |
| struct snd_pcm_substream *substream_be; |
| struct snd_soc_dai *dai = asoc_rtd_to_cpu(be, 0); |
| |
| 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(asoc_rtd_to_cpu(rtd, 0), substream); |
| dma_params_fe->addr = asrc->paddr + asrc->get_fifo_addr(!dir, index); |
| dma_params_fe->maxburst = dma_params_be->maxburst; |
| |
| pair->dma_chan[!dir] = 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); |
| |
| /* |
| * The Back-End device might have already requested a DMA channel, |
| * so try to reuse it first, and then request a new one upon NULL. |
| */ |
| component_be = snd_soc_lookup_component_nolocked(dev_be, SND_DMAENGINE_PCM_DRV_NAME); |
| if (component_be) { |
| be_chan = soc_component_to_pcm(component_be)->chan[substream->stream]; |
| tmp_chan = be_chan; |
| } |
| if (!tmp_chan) |
| tmp_chan = dma_request_slave_channel(dev_be, tx ? "tx" : "rx"); |
| |
| /* |
| * An EDMA DEV_TO_DEV channel is fixed and bound with DMA event of each |
| * peripheral, unlike SDMA channel that is allocated dynamically. So no |
| * need to configure dma_request and dma_request2, but get dma_chan of |
| * Back-End device directly via dma_request_slave_channel. |
| */ |
| if (!asrc->use_edma) { |
| /* Get DMA request of Back-End */ |
| tmp_data = tmp_chan->private; |
| pair->dma_data.dma_request = tmp_data->dma_request; |
| if (!be_chan) |
| dma_release_channel(tmp_chan); |
| |
| /* Get DMA request of Front-End */ |
| tmp_chan = 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); |
| |
| of_dma_node = pair->dma_chan[!dir]->device->dev->of_node; |
| pair->dma_chan[dir] = |
| __dma_request_channel(&mask, filter, &pair->dma_data, |
| of_dma_node); |
| pair->req_dma_chan = true; |
| } else { |
| pair->dma_chan[dir] = tmp_chan; |
| /* Do not flag to release if we are reusing the Back-End one */ |
| pair->req_dma_chan = !be_chan; |
| } |
| |
| if (!pair->dma_chan[dir]) { |
| dev_err(dev, "failed to request DMA channel for Back-End\n"); |
| return -EINVAL; |
| } |
| |
| width = snd_pcm_format_physical_width(asrc->asrc_format); |
| if (width < 8 || width > 64) |
| return -EINVAL; |
| else if (width == 8) |
| buswidth = DMA_SLAVE_BUSWIDTH_1_BYTE; |
| else if (width == 16) |
| buswidth = DMA_SLAVE_BUSWIDTH_2_BYTES; |
| else if (width == 24) |
| buswidth = DMA_SLAVE_BUSWIDTH_3_BYTES; |
| else if (width <= 32) |
| buswidth = DMA_SLAVE_BUSWIDTH_4_BYTES; |
| else |
| buswidth = DMA_SLAVE_BUSWIDTH_8_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->paddr + asrc->get_fifo_addr(OUT, index); |
| config_be.dst_addr = dma_params_be->addr; |
| } else { |
| config_be.dst_addr = asrc->paddr + asrc->get_fifo_addr(IN, 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"); |
| if (pair->req_dma_chan) |
| dma_release_channel(pair->dma_chan[dir]); |
| return ret; |
| } |
| |
| return 0; |
| } |
| |
| static int fsl_asrc_dma_hw_free(struct snd_soc_component *component, |
| struct snd_pcm_substream *substream) |
| { |
| bool tx = substream->stream == SNDRV_PCM_STREAM_PLAYBACK; |
| struct snd_pcm_runtime *runtime = substream->runtime; |
| struct fsl_asrc_pair *pair = runtime->private_data; |
| u8 dir = tx ? OUT : IN; |
| |
| if (pair->dma_chan[!dir]) |
| dma_release_channel(pair->dma_chan[!dir]); |
| |
| /* release dev_to_dev chan if we aren't reusing the Back-End one */ |
| if (pair->dma_chan[dir] && pair->req_dma_chan) |
| dma_release_channel(pair->dma_chan[dir]); |
| |
| pair->dma_chan[!dir] = NULL; |
| pair->dma_chan[dir] = NULL; |
| |
| return 0; |
| } |
| |
| static int fsl_asrc_dma_startup(struct snd_soc_component *component, |
| struct snd_pcm_substream *substream) |
| { |
| bool tx = substream->stream == SNDRV_PCM_STREAM_PLAYBACK; |
| struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream); |
| struct snd_pcm_runtime *runtime = substream->runtime; |
| struct snd_dmaengine_dai_dma_data *dma_data; |
| struct device *dev = component->dev; |
| struct fsl_asrc *asrc = dev_get_drvdata(dev); |
| struct fsl_asrc_pair *pair; |
| struct dma_chan *tmp_chan = NULL; |
| u8 dir = tx ? OUT : IN; |
| bool release_pair = true; |
| int ret = 0; |
| |
| ret = snd_pcm_hw_constraint_integer(substream->runtime, |
| SNDRV_PCM_HW_PARAM_PERIODS); |
| if (ret < 0) { |
| dev_err(dev, "failed to set pcm hw params periods\n"); |
| return ret; |
| } |
| |
| pair = kzalloc(sizeof(*pair) + asrc->pair_priv_size, GFP_KERNEL); |
| if (!pair) |
| return -ENOMEM; |
| |
| pair->asrc = asrc; |
| pair->private = (void *)pair + sizeof(struct fsl_asrc_pair); |
| |
| runtime->private_data = pair; |
| |
| /* Request a dummy pair, which will be released later. |
| * Request pair function needs channel num as input, for this |
| * dummy pair, we just request "1" channel temporarily. |
| */ |
| ret = asrc->request_pair(1, pair); |
| if (ret < 0) { |
| dev_err(dev, "failed to request asrc pair\n"); |
| goto req_pair_err; |
| } |
| |
| /* Request a dummy dma channel, which will be released later. */ |
| tmp_chan = asrc->get_dma_channel(pair, dir); |
| if (!tmp_chan) { |
| dev_err(dev, "failed to get dma channel\n"); |
| ret = -EINVAL; |
| goto dma_chan_err; |
| } |
| |
| dma_data = snd_soc_dai_get_dma_data(asoc_rtd_to_cpu(rtd, 0), substream); |
| |
| /* Refine the snd_imx_hardware according to caps of DMA. */ |
| ret = snd_dmaengine_pcm_refine_runtime_hwparams(substream, |
| dma_data, |
| &snd_imx_hardware, |
| tmp_chan); |
| if (ret < 0) { |
| dev_err(dev, "failed to refine runtime hwparams\n"); |
| goto out; |
| } |
| |
| release_pair = false; |
| snd_soc_set_runtime_hwparams(substream, &snd_imx_hardware); |
| |
| out: |
| dma_release_channel(tmp_chan); |
| |
| dma_chan_err: |
| asrc->release_pair(pair); |
| |
| req_pair_err: |
| if (release_pair) |
| kfree(pair); |
| |
| return ret; |
| } |
| |
| static int fsl_asrc_dma_shutdown(struct snd_soc_component *component, |
| struct snd_pcm_substream *substream) |
| { |
| struct snd_pcm_runtime *runtime = substream->runtime; |
| struct fsl_asrc_pair *pair = runtime->private_data; |
| struct fsl_asrc *asrc; |
| |
| if (!pair) |
| return 0; |
| |
| asrc = pair->asrc; |
| |
| if (asrc->pair[pair->index] == pair) |
| asrc->pair[pair->index] = NULL; |
| |
| kfree(pair); |
| |
| return 0; |
| } |
| |
| static snd_pcm_uframes_t |
| fsl_asrc_dma_pcm_pointer(struct snd_soc_component *component, |
| 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 int fsl_asrc_dma_pcm_new(struct snd_soc_component *component, |
| struct snd_soc_pcm_runtime *rtd) |
| { |
| struct snd_card *card = rtd->card->snd_card; |
| struct snd_pcm *pcm = rtd->pcm; |
| int ret; |
| |
| 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; |
| } |
| |
| return snd_pcm_set_fixed_buffer_all(pcm, SNDRV_DMA_TYPE_DEV, |
| card->dev, FSL_ASRC_DMABUF_SIZE); |
| } |
| |
| struct snd_soc_component_driver fsl_asrc_component = { |
| .name = DRV_NAME, |
| .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, |
| .pcm_construct = fsl_asrc_dma_pcm_new, |
| }; |
| EXPORT_SYMBOL_GPL(fsl_asrc_component); |