diff options
Diffstat (limited to 'sound/soc/soc-dmaengine-pcm.c')
| -rw-r--r-- | sound/soc/soc-dmaengine-pcm.c | 367 |
1 files changed, 0 insertions, 367 deletions
diff --git a/sound/soc/soc-dmaengine-pcm.c b/sound/soc/soc-dmaengine-pcm.c deleted file mode 100644 index aa924d9..0000000 --- a/sound/soc/soc-dmaengine-pcm.c +++ /dev/null @@ -1,367 +0,0 @@ -/* - * Copyright (C) 2012, Analog Devices Inc. - * Author: Lars-Peter Clausen <lars@metafoo.de> - * - * Based on: - * imx-pcm-dma-mx2.c, Copyright 2009 Sascha Hauer <s.hauer@pengutronix.de> - * mxs-pcm.c, Copyright (C) 2011 Freescale Semiconductor, Inc. - * ep93xx-pcm.c, Copyright (C) 2006 Lennert Buytenhek <buytenh@wantstofly.org> - * Copyright (C) 2006 Applied Data Systems - * - * This program is free software; you can redistribute it and/or modify it - * under the terms of the GNU General Public License as published by the - * Free Software Foundation; either version 2 of the License, or (at your - * option) any later version. - * - * 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., - * 675 Mass Ave, Cambridge, MA 02139, USA. - * - */ -#include <linux/module.h> -#include <linux/init.h> -#include <linux/dmaengine.h> -#include <linux/slab.h> -#include <sound/pcm.h> -#include <sound/pcm_params.h> -#include <sound/soc.h> - -#include <sound/dmaengine_pcm.h> - -struct dmaengine_pcm_runtime_data { - struct dma_chan *dma_chan; - dma_cookie_t cookie; - - unsigned int pos; -}; - -static inline struct dmaengine_pcm_runtime_data *substream_to_prtd( - const struct snd_pcm_substream *substream) -{ - return substream->runtime->private_data; -} - -struct dma_chan *snd_dmaengine_pcm_get_chan(struct snd_pcm_substream *substream) -{ - struct dmaengine_pcm_runtime_data *prtd = substream_to_prtd(substream); - - return prtd->dma_chan; -} -EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_get_chan); - -/** - * snd_hwparams_to_dma_slave_config - Convert hw_params to dma_slave_config - * @substream: PCM substream - * @params: hw_params - * @slave_config: DMA slave config - * - * This function can be used to initialize a dma_slave_config from a substream - * and hw_params in a dmaengine based PCM driver implementation. - */ -int snd_hwparams_to_dma_slave_config(const struct snd_pcm_substream *substream, - const struct snd_pcm_hw_params *params, - struct dma_slave_config *slave_config) -{ - enum dma_slave_buswidth buswidth; - - switch (params_format(params)) { - case SNDRV_PCM_FORMAT_S8: - buswidth = DMA_SLAVE_BUSWIDTH_1_BYTE; - break; - case SNDRV_PCM_FORMAT_S16_LE: - buswidth = DMA_SLAVE_BUSWIDTH_2_BYTES; - break; - case SNDRV_PCM_FORMAT_S18_3LE: - case SNDRV_PCM_FORMAT_S20_3LE: - case SNDRV_PCM_FORMAT_S24_LE: - case SNDRV_PCM_FORMAT_S32_LE: - buswidth = DMA_SLAVE_BUSWIDTH_4_BYTES; - break; - default: - return -EINVAL; - } - - if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { - slave_config->direction = DMA_MEM_TO_DEV; - slave_config->dst_addr_width = buswidth; - } else { - slave_config->direction = DMA_DEV_TO_MEM; - slave_config->src_addr_width = buswidth; - } - - slave_config->device_fc = false; - - return 0; -} -EXPORT_SYMBOL_GPL(snd_hwparams_to_dma_slave_config); - -/** - * snd_dmaengine_pcm_set_config_from_dai_data() - Initializes a dma slave config - * using DAI DMA data. - * @substream: PCM substream - * @dma_data: DAI DMA data - * @slave_config: DMA slave configuration - * - * Initializes the {dst,src}_addr, {dst,src}_maxburst, {dst,src}_addr_width and - * slave_id fields of the DMA slave config from the same fields of the DAI DMA - * data struct. The src and dst fields will be initialized depending on the - * direction of the substream. If the substream is a playback stream the dst - * fields will be initialized, if it is a capture stream the src fields will be - * initialized. The {dst,src}_addr_width field will only be initialized if the - * addr_width field of the DAI DMA data struct is not equal to - * DMA_SLAVE_BUSWIDTH_UNDEFINED. - */ -void snd_dmaengine_pcm_set_config_from_dai_data( - const struct snd_pcm_substream *substream, - const struct snd_dmaengine_dai_dma_data *dma_data, - struct dma_slave_config *slave_config) -{ - if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { - slave_config->dst_addr = dma_data->addr; - slave_config->dst_maxburst = dma_data->maxburst; - if (dma_data->addr_width != DMA_SLAVE_BUSWIDTH_UNDEFINED) - slave_config->dst_addr_width = dma_data->addr_width; - } else { - slave_config->src_addr = dma_data->addr; - slave_config->src_maxburst = dma_data->maxburst; - if (dma_data->addr_width != DMA_SLAVE_BUSWIDTH_UNDEFINED) - slave_config->src_addr_width = dma_data->addr_width; - } - - slave_config->slave_id = dma_data->slave_id; -} -EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_set_config_from_dai_data); - -static void dmaengine_pcm_dma_complete(void *arg) -{ - struct snd_pcm_substream *substream = arg; - struct dmaengine_pcm_runtime_data *prtd = substream_to_prtd(substream); - - prtd->pos += snd_pcm_lib_period_bytes(substream); - if (prtd->pos >= snd_pcm_lib_buffer_bytes(substream)) - prtd->pos = 0; - - snd_pcm_period_elapsed(substream); -} - -static int dmaengine_pcm_prepare_and_submit(struct snd_pcm_substream *substream) -{ - struct dmaengine_pcm_runtime_data *prtd = substream_to_prtd(substream); - struct dma_chan *chan = prtd->dma_chan; - struct dma_async_tx_descriptor *desc; - enum dma_transfer_direction direction; - unsigned long flags = DMA_CTRL_ACK; - - direction = snd_pcm_substream_to_dma_direction(substream); - - if (!substream->runtime->no_period_wakeup) - flags |= DMA_PREP_INTERRUPT; - - prtd->pos = 0; - desc = dmaengine_prep_dma_cyclic(chan, - substream->runtime->dma_addr, - snd_pcm_lib_buffer_bytes(substream), - snd_pcm_lib_period_bytes(substream), direction, flags); - - if (!desc) - return -ENOMEM; - - desc->callback = dmaengine_pcm_dma_complete; - desc->callback_param = substream; - prtd->cookie = dmaengine_submit(desc); - - return 0; -} - -/** - * snd_dmaengine_pcm_trigger - dmaengine based PCM trigger implementation - * @substream: PCM substream - * @cmd: Trigger command - * - * Returns 0 on success, a negative error code otherwise. - * - * This function can be used as the PCM trigger callback for dmaengine based PCM - * driver implementations. - */ -int snd_dmaengine_pcm_trigger(struct snd_pcm_substream *substream, int cmd) -{ - struct dmaengine_pcm_runtime_data *prtd = substream_to_prtd(substream); - int ret; - - switch (cmd) { - case SNDRV_PCM_TRIGGER_START: - ret = dmaengine_pcm_prepare_and_submit(substream); - if (ret) - return ret; - dma_async_issue_pending(prtd->dma_chan); - break; - case SNDRV_PCM_TRIGGER_RESUME: - case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: - dmaengine_resume(prtd->dma_chan); - break; - case SNDRV_PCM_TRIGGER_SUSPEND: - case SNDRV_PCM_TRIGGER_PAUSE_PUSH: - dmaengine_pause(prtd->dma_chan); - break; - case SNDRV_PCM_TRIGGER_STOP: - dmaengine_terminate_all(prtd->dma_chan); - break; - default: - return -EINVAL; - } - - return 0; -} -EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_trigger); - -/** - * snd_dmaengine_pcm_pointer_no_residue - dmaengine based PCM pointer implementation - * @substream: PCM substream - * - * This function is deprecated and should not be used by new drivers, as its - * results may be unreliable. - */ -snd_pcm_uframes_t snd_dmaengine_pcm_pointer_no_residue(struct snd_pcm_substream *substream) -{ - struct dmaengine_pcm_runtime_data *prtd = substream_to_prtd(substream); - return bytes_to_frames(substream->runtime, prtd->pos); -} -EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_pointer_no_residue); - -/** - * snd_dmaengine_pcm_pointer - dmaengine based PCM pointer implementation - * @substream: PCM substream - * - * This function can be used as the PCM pointer callback for dmaengine based PCM - * driver implementations. - */ -snd_pcm_uframes_t snd_dmaengine_pcm_pointer(struct snd_pcm_substream *substream) -{ - struct dmaengine_pcm_runtime_data *prtd = substream_to_prtd(substream); - struct dma_tx_state state; - enum dma_status status; - unsigned int buf_size; - unsigned int pos = 0; - - status = dmaengine_tx_status(prtd->dma_chan, prtd->cookie, &state); - if (status == DMA_IN_PROGRESS || status == DMA_PAUSED) { - buf_size = snd_pcm_lib_buffer_bytes(substream); - if (state.residue > 0 && state.residue <= buf_size) - pos = buf_size - state.residue; - } - - return bytes_to_frames(substream->runtime, pos); -} -EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_pointer); - -/** - * snd_dmaengine_pcm_request_channel - Request channel for the dmaengine PCM - * @filter_fn: Filter function used to request the DMA channel - * @filter_data: Data passed to the DMA filter function - * - * Returns NULL or the requested DMA channel. - * - * This function request a DMA channel for usage with dmaengine PCM. - */ -struct dma_chan *snd_dmaengine_pcm_request_channel(dma_filter_fn filter_fn, - void *filter_data) -{ - dma_cap_mask_t mask; - - dma_cap_zero(mask); - dma_cap_set(DMA_SLAVE, mask); - dma_cap_set(DMA_CYCLIC, mask); - - return dma_request_channel(mask, filter_fn, filter_data); -} -EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_request_channel); - -/** - * snd_dmaengine_pcm_open - Open a dmaengine based PCM substream - * @substream: PCM substream - * @chan: DMA channel to use for data transfers - * - * Returns 0 on success, a negative error code otherwise. - * - * The function should usually be called from the pcm open callback. Note that - * this function will use private_data field of the substream's runtime. So it - * is not availabe to your pcm driver implementation. - */ -int snd_dmaengine_pcm_open(struct snd_pcm_substream *substream, - struct dma_chan *chan) -{ - struct dmaengine_pcm_runtime_data *prtd; - int ret; - - if (!chan) - return -ENXIO; - - ret = snd_pcm_hw_constraint_integer(substream->runtime, - SNDRV_PCM_HW_PARAM_PERIODS); - if (ret < 0) - return ret; - - prtd = kzalloc(sizeof(*prtd), GFP_KERNEL); - if (!prtd) - return -ENOMEM; - - prtd->dma_chan = chan; - - substream->runtime->private_data = prtd; - - return 0; -} -EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_open); - -/** - * snd_dmaengine_pcm_open_request_chan - Open a dmaengine based PCM substream and request channel - * @substream: PCM substream - * @filter_fn: Filter function used to request the DMA channel - * @filter_data: Data passed to the DMA filter function - * - * Returns 0 on success, a negative error code otherwise. - * - * This function will request a DMA channel using the passed filter function and - * data. The function should usually be called from the pcm open callback. Note - * that this function will use private_data field of the substream's runtime. So - * it is not availabe to your pcm driver implementation. - */ -int snd_dmaengine_pcm_open_request_chan(struct snd_pcm_substream *substream, - dma_filter_fn filter_fn, void *filter_data) -{ - return snd_dmaengine_pcm_open(substream, - snd_dmaengine_pcm_request_channel(filter_fn, filter_data)); -} -EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_open_request_chan); - -/** - * snd_dmaengine_pcm_close - Close a dmaengine based PCM substream - * @substream: PCM substream - */ -int snd_dmaengine_pcm_close(struct snd_pcm_substream *substream) -{ - struct dmaengine_pcm_runtime_data *prtd = substream_to_prtd(substream); - - kfree(prtd); - - return 0; -} -EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_close); - -/** - * snd_dmaengine_pcm_release_chan_close - Close a dmaengine based PCM substream and release channel - * @substream: PCM substream - * - * Releases the DMA channel associated with the PCM substream. - */ -int snd_dmaengine_pcm_close_release_chan(struct snd_pcm_substream *substream) -{ - struct dmaengine_pcm_runtime_data *prtd = substream_to_prtd(substream); - - dma_release_channel(prtd->dma_chan); - - return snd_dmaengine_pcm_close(substream); -} -EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_close_release_chan); - -MODULE_LICENSE("GPL"); |