/* * 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/dma-mapping.h> #include <linux/gfp.h> #include <sound/core.h> #include <sound/pcm.h> #include <sound/pcm_params.h> #include <sound/soc.h> #include <asm/dma.h> #include "bf5xx-sport.h" #include "bf5xx-i2s-pcm.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_VALID | SNDRV_PCM_INFO_BLOCK_TRANSFER, .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) { struct snd_soc_pcm_runtime *rtd = substream->private_data; unsigned int buffer_size = params_buffer_bytes(params); struct bf5xx_i2s_pcm_data *dma_data; dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream); if (dma_data->tdm_mode) buffer_size = buffer_size / params_channels(params) * 8; return snd_pcm_lib_malloc_pages(substream, buffer_size); } 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_soc_pcm_runtime *rtd = substream->private_data; struct snd_pcm_runtime *runtime = substream->runtime; struct sport_device *sport = runtime->private_data; int period_bytes = frames_to_bytes(runtime, runtime->period_size); struct bf5xx_i2s_pcm_data *dma_data; dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream); if (dma_data->tdm_mode) period_bytes = period_bytes / runtime->channels * 8; 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_soc_pcm_runtime *rtd = substream->private_data; struct snd_pcm_runtime *runtime = substream->runtime; struct sport_device *sport = runtime->private_data; unsigned int diff; snd_pcm_uframes_t frames; struct bf5xx_i2s_pcm_data *dma_data; dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream); pr_debug("%s enter\n", __func__); if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { diff = sport_curr_offset_tx(sport); } else { diff = sport_curr_offset_rx(sport); } /* * TX at least can report one frame beyond the end of the * buffer if we hit the wraparound case - clamp to within the * buffer as the ALSA APIs require. */ if (diff == snd_pcm_lib_buffer_bytes(substream)) diff = 0; frames = bytes_to_frames(substream->runtime, diff); if (dma_data->tdm_mode) frames = frames * runtime->channels / 8; return frames; } static int bf5xx_pcm_open(struct snd_pcm_substream *substream) { struct snd_soc_pcm_runtime *rtd = substream->private_data; struct snd_soc_dai *cpu_dai = rtd->cpu_dai; struct sport_device *sport_handle = snd_soc_dai_get_drvdata(cpu_dai); struct snd_pcm_runtime *runtime = substream->runtime; struct snd_dma_buffer *buf = &substream->dma_buffer; struct bf5xx_i2s_pcm_data *dma_data; int ret; dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream); pr_debug("%s enter\n", __func__); snd_soc_set_runtime_hwparams(substream, &bf5xx_pcm_hardware); if (dma_data->tdm_mode) runtime->hw.buffer_bytes_max /= 4; else runtime->hw.info |= SNDRV_PCM_INFO_MMAP; ret = snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS); if (ret < 0) goto out; if (sport_handle != NULL) { if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) sport_handle->tx_buf = buf->area; else sport_handle->rx_buf = buf->area; 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 ; } static int bf5xx_pcm_copy(struct snd_pcm_substream *substream, int channel, snd_pcm_uframes_t pos, void *buf, snd_pcm_uframes_t count) { struct snd_soc_pcm_runtime *rtd = substream->private_data; struct snd_pcm_runtime *runtime = substream->runtime; unsigned int sample_size = runtime->sample_bits / 8; struct bf5xx_i2s_pcm_data *dma_data; unsigned int i; void *src, *dst; dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream); if (dma_data->tdm_mode) { if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { src = buf; dst = runtime->dma_area; dst += pos * sample_size * 8; while (count--) { for (i = 0; i < runtime->channels; i++) { memcpy(dst + dma_data->map[i] * sample_size, src, sample_size); src += sample_size; } dst += 8 * sample_size; } } else { src = runtime->dma_area; src += pos * sample_size * 8; dst = buf; while (count--) { for (i = 0; i < runtime->channels; i++) { memcpy(dst, src + dma_data->map[i] * sample_size, sample_size); dst += sample_size; } src += 8 * sample_size; } } } else { if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { src = buf; dst = runtime->dma_area; dst += frames_to_bytes(runtime, pos); } else { src = runtime->dma_area; src += frames_to_bytes(runtime, pos); dst = buf; } memcpy(dst, src, frames_to_bytes(runtime, count)); } return 0; } static int bf5xx_pcm_silence(struct snd_pcm_substream *substream, int channel, snd_pcm_uframes_t pos, snd_pcm_uframes_t count) { struct snd_soc_pcm_runtime *rtd = substream->private_data; struct snd_pcm_runtime *runtime = substream->runtime; unsigned int sample_size = runtime->sample_bits / 8; void *buf = runtime->dma_area; struct bf5xx_i2s_pcm_data *dma_data; unsigned int offset, samples; dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream); if (dma_data->tdm_mode) { offset = pos * 8 * sample_size; samples = count * 8; } else { offset = frames_to_bytes(runtime, pos); samples = count * runtime->channels; } snd_pcm_format_set_silence(runtime->format, buf + offset, samples); return 0; } static 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, .copy = bf5xx_pcm_copy, .silence = bf5xx_pcm_silence, }; static int bf5xx_pcm_i2s_new(struct snd_soc_pcm_runtime *rtd) { struct snd_card *card = rtd->card->snd_card; size_t size = bf5xx_pcm_hardware.buffer_bytes_max; int ret; pr_debug("%s enter\n", __func__); ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32)); if (ret) return ret; return snd_pcm_lib_preallocate_pages_for_all(rtd->pcm, SNDRV_DMA_TYPE_DEV, card->dev, size, size); } static struct snd_soc_platform_driver bf5xx_i2s_soc_platform = { .ops = &bf5xx_pcm_i2s_ops, .pcm_new = bf5xx_pcm_i2s_new, }; static int bfin_i2s_soc_platform_probe(struct platform_device *pdev) { return devm_snd_soc_register_platform(&pdev->dev, &bf5xx_i2s_soc_platform); } static struct platform_driver bfin_i2s_pcm_driver = { .driver = { .name = "bfin-i2s-pcm-audio", }, .probe = bfin_i2s_soc_platform_probe, }; module_platform_driver(bfin_i2s_pcm_driver); MODULE_AUTHOR("Cliff Cai"); MODULE_DESCRIPTION("ADI Blackfin I2S PCM DMA module"); MODULE_LICENSE("GPL");