/* * omap-pcm.c -- ALSA PCM interface for the OMAP SoC * * Copyright (C) 2008 Nokia Corporation * * Contact: Jarkko Nikula * Peter Ujfalusi * * 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. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA * 02110-1301 USA * */ #include #include #include #include #include #include #include #include #include #include #include "omap-pcm.h" static const struct snd_pcm_hardware omap_pcm_hardware = { .info = SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID | SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME | SNDRV_PCM_INFO_NO_PERIOD_WAKEUP, .formats = SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S32_LE, .period_bytes_min = 32, .period_bytes_max = 64 * 1024, .periods_min = 2, .periods_max = 255, .buffer_bytes_max = 128 * 1024, }; static int omap_pcm_get_dma_buswidth(int num_bits) { int buswidth; switch (num_bits) { case 16: buswidth = DMA_SLAVE_BUSWIDTH_2_BYTES; break; case 32: buswidth = DMA_SLAVE_BUSWIDTH_4_BYTES; break; default: buswidth = -EINVAL; break; } return buswidth; } /* this may get called several times by oss emulation */ static int omap_pcm_hw_params(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params) { struct snd_pcm_runtime *runtime = substream->runtime; struct snd_soc_pcm_runtime *rtd = substream->private_data; struct omap_pcm_dma_data *dma_data; struct dma_slave_config config; struct dma_chan *chan; int err = 0; dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream); /* return if this is a bufferless transfer e.g. * codec <--> BT codec or GSM modem -- lg FIXME */ if (!dma_data) return 0; snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer); runtime->dma_bytes = params_buffer_bytes(params); chan = snd_dmaengine_pcm_get_chan(substream); if (!chan) return -EINVAL; /* fills in addr_width and direction */ err = snd_hwparams_to_dma_slave_config(substream, params, &config); if (err) return err; /* Override the *_dma addr_width if requested by the DAI driver */ if (dma_data->data_type) { int buswidth = omap_pcm_get_dma_buswidth(dma_data->data_type); if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) config.dst_addr_width = buswidth; else config.src_addr_width = buswidth; } config.src_addr = dma_data->port_addr; config.dst_addr = dma_data->port_addr; config.src_maxburst = dma_data->packet_size; config.dst_maxburst = dma_data->packet_size; return dmaengine_slave_config(chan, &config); } static int omap_pcm_hw_free(struct snd_pcm_substream *substream) { snd_pcm_set_runtime_buffer(substream, NULL); return 0; } static int omap_pcm_trigger(struct snd_pcm_substream *substream, int cmd) { struct snd_soc_pcm_runtime *rtd = substream->private_data; struct omap_pcm_dma_data *dma_data; int ret = 0; dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream); switch (cmd) { case SNDRV_PCM_TRIGGER_START: case SNDRV_PCM_TRIGGER_RESUME: case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: /* Configure McBSP internal buffer usage */ if (dma_data->set_threshold) dma_data->set_threshold(substream); break; case SNDRV_PCM_TRIGGER_STOP: case SNDRV_PCM_TRIGGER_SUSPEND: case SNDRV_PCM_TRIGGER_PAUSE_PUSH: break; default: ret = -EINVAL; } if (ret == 0) ret = snd_dmaengine_pcm_trigger(substream, cmd); return ret; } static snd_pcm_uframes_t omap_pcm_pointer(struct snd_pcm_substream *substream) { snd_pcm_uframes_t offset; if (cpu_is_omap1510()) offset = snd_dmaengine_pcm_pointer_no_residue(substream); else offset = snd_dmaengine_pcm_pointer(substream); return offset; } static int omap_pcm_open(struct snd_pcm_substream *substream) { struct snd_pcm_runtime *runtime = substream->runtime; struct snd_soc_pcm_runtime *rtd = substream->private_data; struct omap_pcm_dma_data *dma_data; int ret; snd_soc_set_runtime_hwparams(substream, &omap_pcm_hardware); /* Ensure that buffer size is a multiple of period size */ ret = snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS); if (ret < 0) return ret; dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream); ret = snd_dmaengine_pcm_open(substream, omap_dma_filter_fn, &dma_data->dma_req); return ret; } static int omap_pcm_close(struct snd_pcm_substream *substream) { snd_dmaengine_pcm_close(substream); return 0; } static int omap_pcm_mmap(struct snd_pcm_substream *substream, struct vm_area_struct *vma) { struct snd_pcm_runtime *runtime = substream->runtime; return dma_mmap_writecombine(substream->pcm->card->dev, vma, runtime->dma_area, runtime->dma_addr, runtime->dma_bytes); } static struct snd_pcm_ops omap_pcm_ops = { .open = omap_pcm_open, .close = omap_pcm_close, .ioctl = snd_pcm_lib_ioctl, .hw_params = omap_pcm_hw_params, .hw_free = omap_pcm_hw_free, .trigger = omap_pcm_trigger, .pointer = omap_pcm_pointer, .mmap = omap_pcm_mmap, }; static u64 omap_pcm_dmamask = DMA_BIT_MASK(64); static int omap_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream) { struct snd_pcm_substream *substream = pcm->streams[stream].substream; struct snd_dma_buffer *buf = &substream->dma_buffer; size_t size = omap_pcm_hardware.buffer_bytes_max; buf->dev.type = SNDRV_DMA_TYPE_DEV; buf->dev.dev = pcm->card->dev; buf->private_data = NULL; buf->area = dma_alloc_writecombine(pcm->card->dev, size, &buf->addr, GFP_KERNEL); if (!buf->area) return -ENOMEM; buf->bytes = size; return 0; } static void omap_pcm_free_dma_buffers(struct snd_pcm *pcm) { struct snd_pcm_substream *substream; struct snd_dma_buffer *buf; int stream; for (stream = 0; stream < 2; stream++) { substream = pcm->streams[stream].substream; if (!substream) continue; buf = &substream->dma_buffer; if (!buf->area) continue; dma_free_writecombine(pcm->card->dev, buf->bytes, buf->area, buf->addr); buf->area = NULL; } } static int omap_pcm_new(struct snd_soc_pcm_runtime *rtd) { struct snd_card *card = rtd->card->snd_card; struct snd_pcm *pcm = rtd->pcm; int ret = 0; if (!card->dev->dma_mask) card->dev->dma_mask = &omap_pcm_dmamask; if (!card->dev->coherent_dma_mask) card->dev->coherent_dma_mask = DMA_BIT_MASK(64); if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) { ret = omap_pcm_preallocate_dma_buffer(pcm, SNDRV_PCM_STREAM_PLAYBACK); if (ret) goto out; } if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) { ret = omap_pcm_preallocate_dma_buffer(pcm, SNDRV_PCM_STREAM_CAPTURE); if (ret) goto out; } out: /* free preallocated buffers in case of error */ if (ret) omap_pcm_free_dma_buffers(pcm); return ret; } static struct snd_soc_platform_driver omap_soc_platform = { .ops = &omap_pcm_ops, .pcm_new = omap_pcm_new, .pcm_free = omap_pcm_free_dma_buffers, }; static int omap_pcm_probe(struct platform_device *pdev) { return snd_soc_register_platform(&pdev->dev, &omap_soc_platform); } static int omap_pcm_remove(struct platform_device *pdev) { snd_soc_unregister_platform(&pdev->dev); return 0; } static struct platform_driver omap_pcm_driver = { .driver = { .name = "omap-pcm-audio", .owner = THIS_MODULE, }, .probe = omap_pcm_probe, .remove = omap_pcm_remove, }; module_platform_driver(omap_pcm_driver); MODULE_AUTHOR("Jarkko Nikula "); MODULE_DESCRIPTION("OMAP PCM DMA module"); MODULE_LICENSE("GPL"); MODULE_ALIAS("platform:omap-pcm-audio");