/* * 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 #ifdef CONFIG_ARCH_OMAP1 #define pcm_omap1510() cpu_is_omap1510() #else #define pcm_omap1510() 0 #endif 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, .period_bytes_min = 32, .period_bytes_max = 64 * 1024, .periods_min = 2, .periods_max = 255, .buffer_bytes_max = 128 * 1024, }; /* 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; snd_dmaengine_pcm_set_config_from_dai_data(substream, snd_soc_dai_get_dma_data(rtd->cpu_dai, substream), &config); 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 snd_pcm_uframes_t omap_pcm_pointer(struct snd_pcm_substream *substream) { snd_pcm_uframes_t offset; if (pcm_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_soc_pcm_runtime *rtd = substream->private_data; struct snd_dmaengine_dai_dma_data *dma_data; int ret; snd_soc_set_runtime_hwparams(substream, &omap_pcm_hardware); dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream); /* DT boot: filter_data is the DMA name */ if (rtd->cpu_dai->dev->of_node) { struct dma_chan *chan; chan = dma_request_slave_channel(rtd->cpu_dai->dev, dma_data->filter_data); ret = snd_dmaengine_pcm_open(substream, chan); } else { ret = snd_dmaengine_pcm_open_request_chan(substream, omap_dma_filter_fn, dma_data->filter_data); } return ret; } 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 = snd_dmaengine_pcm_close_release_chan, .ioctl = snd_pcm_lib_ioctl, .hw_params = omap_pcm_hw_params, .hw_free = omap_pcm_hw_free, .trigger = snd_dmaengine_pcm_trigger, .pointer = omap_pcm_pointer, .mmap = omap_pcm_mmap, }; 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; ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(64)); if (ret) return ret; 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, }; int omap_pcm_platform_register(struct device *dev) { return devm_snd_soc_register_platform(dev, &omap_soc_platform); } EXPORT_SYMBOL_GPL(omap_pcm_platform_register); MODULE_AUTHOR("Jarkko Nikula "); MODULE_DESCRIPTION("OMAP PCM DMA module"); MODULE_LICENSE("GPL");