| /* |
| * File: sound/soc/blackfin/bf5xx-i2s-pcm.c |
| * Author: Cliff Cai <Cliff.Cai@analog.com> |
| * |
| * Created: Tue June 06 2008 |
| * Description: DMA driver for i2s codec |
| * |
| * Modified: |
| * Copyright 2008 Analog Devices Inc. |
| * |
| * Bugs: Enter bugs at http://blackfin.uclinux.org/ |
| * |
| * 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. |
| * |
| * 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, see the file COPYING, or write |
| * to the Free Software Foundation, Inc., |
| * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| #include <linux/module.h> |
| #include <linux/init.h> |
| #include <linux/platform_device.h> |
| #include <linux/slab.h> |
| #include <linux/dma-mapping.h> |
| |
| #include <sound/core.h> |
| #include <sound/pcm.h> |
| #include <sound/pcm_params.h> |
| #include <sound/soc.h> |
| |
| #include <asm/dma.h> |
| |
| #include "bf5xx-i2s-pcm.h" |
| #include "bf5xx-i2s.h" |
| #include "bf5xx-sport.h" |
| |
| static void bf5xx_dma_irq(void *data) |
| { |
| struct snd_pcm_substream *pcm = data; |
| snd_pcm_period_elapsed(pcm); |
| } |
| |
| static const struct snd_pcm_hardware bf5xx_pcm_hardware = { |
| .info = SNDRV_PCM_INFO_INTERLEAVED | |
| SNDRV_PCM_INFO_MMAP | |
| SNDRV_PCM_INFO_MMAP_VALID | |
| SNDRV_PCM_INFO_BLOCK_TRANSFER, |
| .formats = SNDRV_PCM_FMTBIT_S16_LE | |
| SNDRV_PCM_FMTBIT_S24_LE | |
| SNDRV_PCM_FMTBIT_S32_LE, |
| .period_bytes_min = 32, |
| .period_bytes_max = 0x10000, |
| .periods_min = 1, |
| .periods_max = PAGE_SIZE/32, |
| .buffer_bytes_max = 0x20000, /* 128 kbytes */ |
| .fifo_size = 16, |
| }; |
| |
| static int bf5xx_pcm_hw_params(struct snd_pcm_substream *substream, |
| struct snd_pcm_hw_params *params) |
| { |
| size_t size = bf5xx_pcm_hardware.buffer_bytes_max; |
| snd_pcm_lib_malloc_pages(substream, size); |
| |
| return 0; |
| } |
| |
| static int bf5xx_pcm_hw_free(struct snd_pcm_substream *substream) |
| { |
| snd_pcm_lib_free_pages(substream); |
| |
| return 0; |
| } |
| |
| static int bf5xx_pcm_prepare(struct snd_pcm_substream *substream) |
| { |
| struct snd_pcm_runtime *runtime = substream->runtime; |
| struct sport_device *sport = runtime->private_data; |
| int period_bytes = frames_to_bytes(runtime, runtime->period_size); |
| |
| pr_debug("%s enter\n", __func__); |
| if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { |
| sport_set_tx_callback(sport, bf5xx_dma_irq, substream); |
| sport_config_tx_dma(sport, runtime->dma_area, |
| runtime->periods, period_bytes); |
| } else { |
| sport_set_rx_callback(sport, bf5xx_dma_irq, substream); |
| sport_config_rx_dma(sport, runtime->dma_area, |
| runtime->periods, period_bytes); |
| } |
| |
| return 0; |
| } |
| |
| static int bf5xx_pcm_trigger(struct snd_pcm_substream *substream, int cmd) |
| { |
| struct snd_pcm_runtime *runtime = substream->runtime; |
| struct sport_device *sport = runtime->private_data; |
| int ret = 0; |
| |
| pr_debug("%s enter\n", __func__); |
| switch (cmd) { |
| case SNDRV_PCM_TRIGGER_START: |
| if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) |
| sport_tx_start(sport); |
| else |
| sport_rx_start(sport); |
| break; |
| case SNDRV_PCM_TRIGGER_STOP: |
| case SNDRV_PCM_TRIGGER_SUSPEND: |
| case SNDRV_PCM_TRIGGER_PAUSE_PUSH: |
| if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) |
| sport_tx_stop(sport); |
| else |
| sport_rx_stop(sport); |
| break; |
| default: |
| ret = -EINVAL; |
| } |
| |
| return ret; |
| } |
| |
| static snd_pcm_uframes_t bf5xx_pcm_pointer(struct snd_pcm_substream *substream) |
| { |
| struct snd_pcm_runtime *runtime = substream->runtime; |
| struct sport_device *sport = runtime->private_data; |
| unsigned int diff; |
| snd_pcm_uframes_t frames; |
| pr_debug("%s enter\n", __func__); |
| if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { |
| diff = sport_curr_offset_tx(sport); |
| frames = bytes_to_frames(substream->runtime, diff); |
| } else { |
| diff = sport_curr_offset_rx(sport); |
| frames = bytes_to_frames(substream->runtime, diff); |
| } |
| return frames; |
| } |
| |
| static int bf5xx_pcm_open(struct snd_pcm_substream *substream) |
| { |
| struct snd_pcm_runtime *runtime = substream->runtime; |
| int ret; |
| |
| pr_debug("%s enter\n", __func__); |
| snd_soc_set_runtime_hwparams(substream, &bf5xx_pcm_hardware); |
| |
| ret = snd_pcm_hw_constraint_integer(runtime, \ |
| SNDRV_PCM_HW_PARAM_PERIODS); |
| if (ret < 0) |
| goto out; |
| |
| if (sport_handle != NULL) |
| runtime->private_data = sport_handle; |
| else { |
| pr_err("sport_handle is NULL\n"); |
| return -1; |
| } |
| return 0; |
| |
| out: |
| return ret; |
| } |
| |
| static int bf5xx_pcm_mmap(struct snd_pcm_substream *substream, |
| struct vm_area_struct *vma) |
| { |
| struct snd_pcm_runtime *runtime = substream->runtime; |
| size_t size = vma->vm_end - vma->vm_start; |
| vma->vm_start = (unsigned long)runtime->dma_area; |
| vma->vm_end = vma->vm_start + size; |
| vma->vm_flags |= VM_SHARED; |
| |
| return 0 ; |
| } |
| |
| struct snd_pcm_ops bf5xx_pcm_i2s_ops = { |
| .open = bf5xx_pcm_open, |
| .ioctl = snd_pcm_lib_ioctl, |
| .hw_params = bf5xx_pcm_hw_params, |
| .hw_free = bf5xx_pcm_hw_free, |
| .prepare = bf5xx_pcm_prepare, |
| .trigger = bf5xx_pcm_trigger, |
| .pointer = bf5xx_pcm_pointer, |
| .mmap = bf5xx_pcm_mmap, |
| }; |
| |
| static int bf5xx_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 = bf5xx_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_coherent(pcm->card->dev, size, |
| &buf->addr, GFP_KERNEL); |
| if (!buf->area) { |
| pr_err("Failed to allocate dma memory \ |
| Please increase uncached DMA memory region\n"); |
| return -ENOMEM; |
| } |
| buf->bytes = size; |
| |
| pr_debug("%s, area:%p, size:0x%08lx\n", __func__, |
| buf->area, buf->bytes); |
| |
| if (stream == SNDRV_PCM_STREAM_PLAYBACK) |
| sport_handle->tx_buf = buf->area; |
| else |
| sport_handle->rx_buf = buf->area; |
| |
| return 0; |
| } |
| |
| static void bf5xx_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_coherent(NULL, buf->bytes, buf->area, 0); |
| buf->area = NULL; |
| } |
| if (sport_handle) |
| sport_done(sport_handle); |
| } |
| |
| static u64 bf5xx_pcm_dmamask = DMA_32BIT_MASK; |
| |
| int bf5xx_pcm_i2s_new(struct snd_card *card, struct snd_soc_dai *dai, |
| struct snd_pcm *pcm) |
| { |
| int ret = 0; |
| |
| pr_debug("%s enter\n", __func__); |
| if (!card->dev->dma_mask) |
| card->dev->dma_mask = &bf5xx_pcm_dmamask; |
| if (!card->dev->coherent_dma_mask) |
| card->dev->coherent_dma_mask = DMA_32BIT_MASK; |
| |
| if (dai->playback.channels_min) { |
| ret = bf5xx_pcm_preallocate_dma_buffer(pcm, |
| SNDRV_PCM_STREAM_PLAYBACK); |
| if (ret) |
| goto out; |
| } |
| |
| if (dai->capture.channels_min) { |
| ret = bf5xx_pcm_preallocate_dma_buffer(pcm, |
| SNDRV_PCM_STREAM_CAPTURE); |
| if (ret) |
| goto out; |
| } |
| out: |
| return ret; |
| } |
| |
| struct snd_soc_platform bf5xx_i2s_soc_platform = { |
| .name = "bf5xx-audio", |
| .pcm_ops = &bf5xx_pcm_i2s_ops, |
| .pcm_new = bf5xx_pcm_i2s_new, |
| .pcm_free = bf5xx_pcm_free_dma_buffers, |
| }; |
| EXPORT_SYMBOL_GPL(bf5xx_i2s_soc_platform); |
| |
| static int __devinit bfin_i2s_init(void) |
| { |
| return snd_soc_register_platform(&bf5xx_i2s_soc_platform); |
| } |
| module_init(bfin_i2s_init); |
| |
| static void __exit bfin_i2s_exit(void) |
| { |
| snd_soc_unregister_platform(&bf5xx_i2s_soc_platform); |
| } |
| module_exit(bfin_i2s_exit); |
| |
| MODULE_AUTHOR("Cliff Cai"); |
| MODULE_DESCRIPTION("ADI Blackfin I2S PCM DMA module"); |
| MODULE_LICENSE("GPL"); |