This provides an ASoC platform driver that manages Tegra's APB DMA controller.
Signed-off-by: Stephen Warren swarren@nvidia.com --- sound/soc/tegra/tegra_pcm.c | 401 +++++++++++++++++++++++++++++++++++++++++++ sound/soc/tegra/tegra_pcm.h | 55 ++++++ 2 files changed, 456 insertions(+), 0 deletions(-) create mode 100644 sound/soc/tegra/tegra_pcm.c create mode 100644 sound/soc/tegra/tegra_pcm.h
diff --git a/sound/soc/tegra/tegra_pcm.c b/sound/soc/tegra/tegra_pcm.c new file mode 100644 index 0000000..663ea9f --- /dev/null +++ b/sound/soc/tegra/tegra_pcm.c @@ -0,0 +1,401 @@ +/* + * tegra_pcm.c - Tegra PCM driver + * + * Author: Stephen Warren swarren@nvidia.com + * Copyright (C) 2010 - NVIDIA, Inc. + * + * Based on code copyright/by: + * + * Copyright (c) 2009-2010, NVIDIA Corporation. + * Scott Peterson speterson@nvidia.com + * Vijay Mali vmali@nvidia.com + * + * Copyright (C) 2010 Google, Inc. + * Iliyan Malchev malchev@google.com + * + * 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 <linux/module.h> +#include <linux/dma-mapping.h> +#include <linux/slab.h> +#include <sound/core.h> +#include <sound/pcm.h> +#include <sound/pcm_params.h> +#include <sound/soc.h> + +#include "tegra_pcm.h" + +static const struct snd_pcm_hardware tegra_pcm_hardware = { + .info = SNDRV_PCM_INFO_MMAP | + SNDRV_PCM_INFO_MMAP_VALID | + SNDRV_PCM_INFO_PAUSE | + SNDRV_PCM_INFO_RESUME | + SNDRV_PCM_INFO_INTERLEAVED, + .formats = SNDRV_PCM_FMTBIT_S16_LE, + .channels_min = 2, + .channels_max = 2, + .period_bytes_min = 1024, + .period_bytes_max = PAGE_SIZE, + .periods_min = 2, + .periods_max = 8, + .buffer_bytes_max = PAGE_SIZE * 8, + .fifo_size = 4, +}; + +static void tegra_pcm_queue_dma(struct tegra_runtime_data *prtd) +{ + struct snd_pcm_substream *substream = prtd->substream; + struct snd_dma_buffer *buf = &substream->dma_buffer; + struct tegra_dma_req *dma_req; + unsigned long addr; + + dma_req = &prtd->dma_req[prtd->dma_req_idx]; + prtd->dma_req_idx = 1 - prtd->dma_req_idx; + + addr = buf->addr + prtd->dma_pos; + prtd->dma_pos += dma_req->size; + if (prtd->dma_pos >= prtd->dma_pos_end) + prtd->dma_pos = 0; + + if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) + dma_req->source_addr = addr; + else + dma_req->dest_addr = addr; + + tegra_dma_enqueue_req(prtd->dma_chan, dma_req); +} + +static void dma_complete_callback(struct tegra_dma_req *req) +{ + struct tegra_runtime_data *prtd = (struct tegra_runtime_data *)req->dev; + struct snd_pcm_substream *substream = prtd->substream; + struct snd_pcm_runtime *runtime = substream->runtime; + + spin_lock(&prtd->lock); + + if (!prtd->running) { + spin_unlock(&prtd->lock); + return; + } + + if (++prtd->period_index >= runtime->periods) + prtd->period_index = 0; + + tegra_pcm_queue_dma(prtd); + + spin_unlock(&prtd->lock); + + snd_pcm_period_elapsed(substream); +} + +static void setup_dma_tx_request(struct tegra_dma_req *req, + struct tegra_pcm_dma_params * dmap) +{ + req->complete = dma_complete_callback; + req->to_memory = false; + req->dest_addr = dmap->addr; + req->dest_wrap = dmap->wrap; + req->source_bus_width = 32; + req->source_wrap = 0; + req->dest_bus_width = dmap->width; + req->req_sel = dmap->req_sel; +} + +static void setup_dma_rx_request(struct tegra_dma_req *req, + struct tegra_pcm_dma_params * dmap) +{ + req->complete = dma_complete_callback; + req->to_memory = true; + req->source_addr = dmap->addr; + req->dest_wrap = 0; + req->source_bus_width = dmap->width; + req->source_wrap = dmap->wrap; + req->dest_bus_width = 32; + req->req_sel = dmap->req_sel; +} + +static int tegra_pcm_open(struct snd_pcm_substream *substream) +{ + struct snd_pcm_runtime *runtime = substream->runtime; + struct tegra_runtime_data *prtd; + struct snd_soc_pcm_runtime *rtd = substream->private_data; + struct tegra_pcm_dma_params * dmap; + int ret = 0; + + prtd = kzalloc(sizeof(struct tegra_runtime_data), GFP_KERNEL); + if (prtd == NULL) + return -ENOMEM; + + runtime->private_data = prtd; + prtd->substream = substream; + + spin_lock_init(&prtd->lock); + + if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { + dmap = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream); + setup_dma_tx_request(&prtd->dma_req[0], dmap); + setup_dma_tx_request(&prtd->dma_req[1], dmap); + } else { + dmap = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream); + setup_dma_rx_request(&prtd->dma_req[0], dmap); + setup_dma_rx_request(&prtd->dma_req[1], dmap); + } + + prtd->dma_req[0].dev = prtd; + prtd->dma_req[1].dev = prtd; + + prtd->dma_chan = tegra_dma_allocate_channel(TEGRA_DMA_MODE_ONESHOT); + if (IS_ERR(prtd->dma_chan)) { + ret = PTR_ERR(prtd->dma_chan); + goto err; + } + + /* Set HW params now that initialization is complete */ + snd_soc_set_runtime_hwparams(substream, &tegra_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) + goto err; + + return 0; + +err: + if (prtd->dma_chan) { + tegra_dma_free_channel(prtd->dma_chan); + } + + kfree(prtd); + + return ret; +} + +static int tegra_pcm_close(struct snd_pcm_substream *substream) +{ + struct snd_pcm_runtime *runtime = substream->runtime; + struct tegra_runtime_data *prtd = runtime->private_data; + + tegra_dma_free_channel(prtd->dma_chan); + + kfree(prtd); + + return 0; +} + +static int tegra_pcm_hw_params(struct snd_pcm_substream *substream, + struct snd_pcm_hw_params *params) +{ + struct snd_pcm_runtime *runtime = substream->runtime; + struct tegra_runtime_data *prtd = runtime->private_data; + + snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer); + + prtd->dma_req[0].size = params_period_bytes(params); + prtd->dma_req[1].size = prtd->dma_req[0].size; + + return 0; +} + +static int tegra_pcm_hw_free(struct snd_pcm_substream *substream) +{ + snd_pcm_set_runtime_buffer(substream, NULL); + + return 0; +} + +static int tegra_pcm_trigger(struct snd_pcm_substream *substream, int cmd) +{ + struct snd_pcm_runtime *runtime = substream->runtime; + struct tegra_runtime_data *prtd = runtime->private_data; + unsigned long flags; + + switch (cmd) { + case SNDRV_PCM_TRIGGER_START: + prtd->dma_pos = 0; + prtd->dma_pos_end = frames_to_bytes(runtime, runtime->periods * runtime->period_size); + prtd->period_index = 0; + prtd->dma_req_idx = 0; + /* Fall-through */ + case SNDRV_PCM_TRIGGER_RESUME: + case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: + spin_lock_irqsave(&prtd->lock, flags); + prtd->running = 1; + spin_unlock_irqrestore(&prtd->lock, flags); + tegra_pcm_queue_dma(prtd); + tegra_pcm_queue_dma(prtd); + break; + case SNDRV_PCM_TRIGGER_STOP: + case SNDRV_PCM_TRIGGER_SUSPEND: + case SNDRV_PCM_TRIGGER_PAUSE_PUSH: + spin_lock_irqsave(&prtd->lock, flags); + prtd->running = 0; + spin_unlock_irqrestore(&prtd->lock, flags); + tegra_dma_dequeue_req(prtd->dma_chan, &prtd->dma_req[0]); + tegra_dma_dequeue_req(prtd->dma_chan, &prtd->dma_req[1]); + break; + default: + return -EINVAL; + } + + return 0; +} + +static snd_pcm_uframes_t tegra_pcm_pointer(struct snd_pcm_substream *substream) +{ + struct snd_pcm_runtime *runtime = substream->runtime; + struct tegra_runtime_data *prtd = runtime->private_data; + + return prtd->period_index * runtime->period_size; +} + + +static int tegra_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 tegra_pcm_ops = { + .open = tegra_pcm_open, + .close = tegra_pcm_close, + .ioctl = snd_pcm_lib_ioctl, + .hw_params = tegra_pcm_hw_params, + .hw_free = tegra_pcm_hw_free, + .trigger = tegra_pcm_trigger, + .pointer = tegra_pcm_pointer, + .mmap = tegra_pcm_mmap, +}; + +static int tegra_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 = tegra_pcm_hardware.buffer_bytes_max; + + buf->area = dma_alloc_writecombine(pcm->card->dev, size, + &buf->addr, GFP_KERNEL); + if (!buf->area) + return -ENOMEM; + + buf->dev.type = SNDRV_DMA_TYPE_DEV; + buf->dev.dev = pcm->card->dev; + buf->private_data = NULL; + buf->bytes = size; + + return 0; +} + +static void tegra_pcm_deallocate_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; + + if (!buf->area) + return; + + dma_free_writecombine(pcm->card->dev, buf->bytes, + buf->area, buf->addr); + buf->area = NULL; +} + +static u64 tegra_dma_mask = DMA_BIT_MASK(32); + +static int tegra_pcm_new(struct snd_card *card, + struct snd_soc_dai *dai, struct snd_pcm *pcm) +{ + int ret = 0; + + if (!card->dev->dma_mask) + card->dev->dma_mask = &tegra_dma_mask; + if (!card->dev->coherent_dma_mask) + card->dev->coherent_dma_mask = 0xffffffff; + + if (dai->driver->playback.channels_min) { + ret = tegra_pcm_preallocate_dma_buffer(pcm, + SNDRV_PCM_STREAM_PLAYBACK); + if (ret) + goto err; + } + + if (dai->driver->capture.channels_min) { + ret = tegra_pcm_preallocate_dma_buffer(pcm, + SNDRV_PCM_STREAM_CAPTURE); + if (ret) + goto err_free_play; + } + + return 0; + +err_free_play: + tegra_pcm_deallocate_dma_buffer(pcm, SNDRV_PCM_STREAM_PLAYBACK); +err: + return ret; +} + +static void tegra_pcm_free(struct snd_pcm *pcm) +{ + tegra_pcm_deallocate_dma_buffer(pcm, SNDRV_PCM_STREAM_CAPTURE); + tegra_pcm_deallocate_dma_buffer(pcm, SNDRV_PCM_STREAM_PLAYBACK); +} + +struct snd_soc_platform_driver tegra_pcm_platform = { + .ops = &tegra_pcm_ops, + .pcm_new = tegra_pcm_new, + .pcm_free = tegra_pcm_free, +}; + +static int __devinit tegra_pcm_platform_probe(struct platform_device *pdev) +{ + return snd_soc_register_platform(&pdev->dev, &tegra_pcm_platform); +} + +static int __devexit tegra_pcm_platform_remove(struct platform_device *pdev) +{ + snd_soc_unregister_platform(&pdev->dev); + return 0; +} + +static struct platform_driver tegra_pcm_driver = { + .driver = { + .name = "tegra-pcm-audio", + .owner = THIS_MODULE, + }, + .probe = tegra_pcm_platform_probe, + .remove = __devexit_p(tegra_pcm_platform_remove), +}; + +static int __init snd_tegra_pcm_init(void) +{ + return platform_driver_register(&tegra_pcm_driver); +} +module_init(snd_tegra_pcm_init); + +static void __exit snd_tegra_pcm_exit(void) +{ + platform_driver_unregister(&tegra_pcm_driver); +} +module_exit(snd_tegra_pcm_exit); + +MODULE_AUTHOR("Stephen Warren swarren@nvidia.com"); +MODULE_DESCRIPTION("Tegra PCM ASoC driver"); +MODULE_LICENSE("GPL"); diff --git a/sound/soc/tegra/tegra_pcm.h b/sound/soc/tegra/tegra_pcm.h new file mode 100644 index 0000000..dbb9033 --- /dev/null +++ b/sound/soc/tegra/tegra_pcm.h @@ -0,0 +1,55 @@ +/* + * tegra_pcm.h - Definitions for Tegra PCM driver + * + * Author: Stephen Warren swarren@nvidia.com + * Copyright (C) 2010 - NVIDIA, Inc. + * + * Based on code copyright/by: + * + * Copyright (c) 2009-2010, NVIDIA Corporation. + * Scott Peterson speterson@nvidia.com + * + * Copyright (C) 2010 Google, Inc. + * Iliyan Malchev malchev@google.com + * + * 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 + * + */ + +#ifndef __TEGRA_PCM_H__ +#define __TEGRA_PCM_H__ + +#include <mach/dma.h> + +struct tegra_pcm_dma_params { + unsigned long addr; + unsigned long wrap; + unsigned long width; + unsigned long req_sel; +}; + +struct tegra_runtime_data { + struct snd_pcm_substream *substream; + spinlock_t lock; + int running; + int dma_pos; + int dma_pos_end; + int period_index; + int dma_req_idx; + struct tegra_dma_req dma_req[2]; + struct tegra_dma_channel *dma_chan; +}; + +#endif