| /* |
| * Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de> |
| * |
| * 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/init.h> |
| #include <linux/interrupt.h> |
| #include <linux/kernel.h> |
| #include <linux/module.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/mach-jz4740/dma.h> |
| #include "jz4740-pcm.h" |
| |
| struct jz4740_runtime_data { |
| unsigned long dma_period; |
| dma_addr_t dma_start; |
| dma_addr_t dma_pos; |
| dma_addr_t dma_end; |
| |
| struct jz4740_dma_chan *dma; |
| |
| dma_addr_t fifo_addr; |
| }; |
| |
| /* identify hardware playback capabilities */ |
| static const struct snd_pcm_hardware jz4740_pcm_hardware = { |
| .info = SNDRV_PCM_INFO_MMAP | |
| SNDRV_PCM_INFO_MMAP_VALID | |
| SNDRV_PCM_INFO_INTERLEAVED | |
| SNDRV_PCM_INFO_BLOCK_TRANSFER, |
| .formats = SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S8, |
| |
| .rates = SNDRV_PCM_RATE_8000_48000, |
| .channels_min = 1, |
| .channels_max = 2, |
| .period_bytes_min = 16, |
| .period_bytes_max = 2 * PAGE_SIZE, |
| .periods_min = 2, |
| .periods_max = 128, |
| .buffer_bytes_max = 128 * 2 * PAGE_SIZE, |
| .fifo_size = 32, |
| }; |
| |
| static void jz4740_pcm_start_transfer(struct jz4740_runtime_data *prtd, |
| struct snd_pcm_substream *substream) |
| { |
| unsigned long count; |
| |
| if (prtd->dma_pos == prtd->dma_end) |
| prtd->dma_pos = prtd->dma_start; |
| |
| if (prtd->dma_pos + prtd->dma_period > prtd->dma_end) |
| count = prtd->dma_end - prtd->dma_pos; |
| else |
| count = prtd->dma_period; |
| |
| jz4740_dma_disable(prtd->dma); |
| |
| if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { |
| jz4740_dma_set_src_addr(prtd->dma, prtd->dma_pos); |
| jz4740_dma_set_dst_addr(prtd->dma, prtd->fifo_addr); |
| } else { |
| jz4740_dma_set_src_addr(prtd->dma, prtd->fifo_addr); |
| jz4740_dma_set_dst_addr(prtd->dma, prtd->dma_pos); |
| } |
| |
| jz4740_dma_set_transfer_count(prtd->dma, count); |
| |
| prtd->dma_pos += count; |
| |
| jz4740_dma_enable(prtd->dma); |
| } |
| |
| static void jz4740_pcm_dma_transfer_done(struct jz4740_dma_chan *dma, int err, |
| void *dev_id) |
| { |
| struct snd_pcm_substream *substream = dev_id; |
| struct snd_pcm_runtime *runtime = substream->runtime; |
| struct jz4740_runtime_data *prtd = runtime->private_data; |
| |
| snd_pcm_period_elapsed(substream); |
| |
| jz4740_pcm_start_transfer(prtd, substream); |
| } |
| |
| static int jz4740_pcm_hw_params(struct snd_pcm_substream *substream, |
| struct snd_pcm_hw_params *params) |
| { |
| struct snd_pcm_runtime *runtime = substream->runtime; |
| struct jz4740_runtime_data *prtd = runtime->private_data; |
| struct snd_soc_pcm_runtime *rtd = substream->private_data; |
| struct jz4740_pcm_config *config; |
| |
| config = snd_soc_dai_get_dma_data(rtd->dai->cpu_dai, substream); |
| |
| if (!config) |
| return 0; |
| |
| if (!prtd->dma) { |
| if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) |
| prtd->dma = jz4740_dma_request(substream, "PCM Capture"); |
| else |
| prtd->dma = jz4740_dma_request(substream, "PCM Playback"); |
| } |
| |
| if (!prtd->dma) |
| return -EBUSY; |
| |
| jz4740_dma_configure(prtd->dma, &config->dma_config); |
| prtd->fifo_addr = config->fifo_addr; |
| |
| jz4740_dma_set_complete_cb(prtd->dma, jz4740_pcm_dma_transfer_done); |
| |
| snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer); |
| runtime->dma_bytes = params_buffer_bytes(params); |
| |
| prtd->dma_period = params_period_bytes(params); |
| prtd->dma_start = runtime->dma_addr; |
| prtd->dma_pos = prtd->dma_start; |
| prtd->dma_end = prtd->dma_start + runtime->dma_bytes; |
| |
| return 0; |
| } |
| |
| static int jz4740_pcm_hw_free(struct snd_pcm_substream *substream) |
| { |
| struct jz4740_runtime_data *prtd = substream->runtime->private_data; |
| |
| snd_pcm_set_runtime_buffer(substream, NULL); |
| if (prtd->dma) { |
| jz4740_dma_free(prtd->dma); |
| prtd->dma = NULL; |
| } |
| |
| return 0; |
| } |
| |
| static int jz4740_pcm_prepare(struct snd_pcm_substream *substream) |
| { |
| struct jz4740_runtime_data *prtd = substream->runtime->private_data; |
| |
| if (!prtd->dma) |
| return -EBUSY; |
| |
| prtd->dma_pos = prtd->dma_start; |
| |
| return 0; |
| } |
| |
| static int jz4740_pcm_trigger(struct snd_pcm_substream *substream, int cmd) |
| { |
| struct snd_pcm_runtime *runtime = substream->runtime; |
| struct jz4740_runtime_data *prtd = runtime->private_data; |
| |
| switch (cmd) { |
| case SNDRV_PCM_TRIGGER_START: |
| case SNDRV_PCM_TRIGGER_RESUME: |
| case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: |
| jz4740_pcm_start_transfer(prtd, substream); |
| break; |
| case SNDRV_PCM_TRIGGER_STOP: |
| case SNDRV_PCM_TRIGGER_SUSPEND: |
| case SNDRV_PCM_TRIGGER_PAUSE_PUSH: |
| jz4740_dma_disable(prtd->dma); |
| break; |
| default: |
| break; |
| } |
| |
| return 0; |
| } |
| |
| static snd_pcm_uframes_t jz4740_pcm_pointer(struct snd_pcm_substream *substream) |
| { |
| struct snd_pcm_runtime *runtime = substream->runtime; |
| struct jz4740_runtime_data *prtd = runtime->private_data; |
| unsigned long byte_offset; |
| snd_pcm_uframes_t offset; |
| struct jz4740_dma_chan *dma = prtd->dma; |
| |
| /* prtd->dma_pos points to the end of the current transfer. So by |
| * subtracting prdt->dma_start we get the offset to the end of the |
| * current period in bytes. By subtracting the residue of the transfer |
| * we get the current offset in bytes. */ |
| byte_offset = prtd->dma_pos - prtd->dma_start; |
| byte_offset -= jz4740_dma_get_residue(dma); |
| |
| offset = bytes_to_frames(runtime, byte_offset); |
| if (offset >= runtime->buffer_size) |
| offset = 0; |
| |
| return offset; |
| } |
| |
| static int jz4740_pcm_open(struct snd_pcm_substream *substream) |
| { |
| struct snd_pcm_runtime *runtime = substream->runtime; |
| struct jz4740_runtime_data *prtd; |
| |
| prtd = kzalloc(sizeof(*prtd), GFP_KERNEL); |
| if (prtd == NULL) |
| return -ENOMEM; |
| |
| snd_soc_set_runtime_hwparams(substream, &jz4740_pcm_hardware); |
| |
| runtime->private_data = prtd; |
| |
| return 0; |
| } |
| |
| static int jz4740_pcm_close(struct snd_pcm_substream *substream) |
| { |
| struct snd_pcm_runtime *runtime = substream->runtime; |
| struct jz4740_runtime_data *prtd = runtime->private_data; |
| |
| kfree(prtd); |
| |
| return 0; |
| } |
| |
| static int jz4740_pcm_mmap(struct snd_pcm_substream *substream, |
| struct vm_area_struct *vma) |
| { |
| return remap_pfn_range(vma, vma->vm_start, |
| substream->dma_buffer.addr >> PAGE_SHIFT, |
| vma->vm_end - vma->vm_start, vma->vm_page_prot); |
| } |
| |
| static struct snd_pcm_ops jz4740_pcm_ops = { |
| .open = jz4740_pcm_open, |
| .close = jz4740_pcm_close, |
| .ioctl = snd_pcm_lib_ioctl, |
| .hw_params = jz4740_pcm_hw_params, |
| .hw_free = jz4740_pcm_hw_free, |
| .prepare = jz4740_pcm_prepare, |
| .trigger = jz4740_pcm_trigger, |
| .pointer = jz4740_pcm_pointer, |
| .mmap = jz4740_pcm_mmap, |
| }; |
| |
| static int jz4740_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 = jz4740_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_noncoherent(pcm->card->dev, size, |
| &buf->addr, GFP_KERNEL); |
| if (!buf->area) |
| return -ENOMEM; |
| |
| buf->bytes = size; |
| |
| return 0; |
| } |
| |
| static void jz4740_pcm_free(struct snd_pcm *pcm) |
| { |
| struct snd_pcm_substream *substream; |
| struct snd_dma_buffer *buf; |
| int stream; |
| |
| for (stream = 0; stream < SNDRV_PCM_STREAM_LAST; ++stream) { |
| substream = pcm->streams[stream].substream; |
| if (!substream) |
| continue; |
| |
| buf = &substream->dma_buffer; |
| if (!buf->area) |
| continue; |
| |
| dma_free_noncoherent(pcm->card->dev, buf->bytes, buf->area, |
| buf->addr); |
| buf->area = NULL; |
| } |
| } |
| |
| static u64 jz4740_pcm_dmamask = DMA_BIT_MASK(32); |
| |
| int jz4740_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 = &jz4740_pcm_dmamask; |
| |
| if (!card->dev->coherent_dma_mask) |
| card->dev->coherent_dma_mask = DMA_BIT_MASK(32); |
| |
| if (dai->playback.channels_min) { |
| ret = jz4740_pcm_preallocate_dma_buffer(pcm, |
| SNDRV_PCM_STREAM_PLAYBACK); |
| if (ret) |
| goto err; |
| } |
| |
| if (dai->capture.channels_min) { |
| ret = jz4740_pcm_preallocate_dma_buffer(pcm, |
| SNDRV_PCM_STREAM_CAPTURE); |
| if (ret) |
| goto err; |
| } |
| |
| err: |
| return ret; |
| } |
| |
| struct snd_soc_platform jz4740_soc_platform = { |
| .name = "jz4740-pcm", |
| .pcm_ops = &jz4740_pcm_ops, |
| .pcm_new = jz4740_pcm_new, |
| .pcm_free = jz4740_pcm_free, |
| }; |
| EXPORT_SYMBOL_GPL(jz4740_soc_platform); |
| |
| static int __devinit jz4740_pcm_probe(struct platform_device *pdev) |
| { |
| return snd_soc_register_platform(&jz4740_soc_platform); |
| } |
| |
| static int __devexit jz4740_pcm_remove(struct platform_device *pdev) |
| { |
| snd_soc_unregister_platform(&jz4740_soc_platform); |
| return 0; |
| } |
| |
| static struct platform_driver jz4740_pcm_driver = { |
| .probe = jz4740_pcm_probe, |
| .remove = __devexit_p(jz4740_pcm_remove), |
| .driver = { |
| .name = "jz4740-pcm", |
| .owner = THIS_MODULE, |
| }, |
| }; |
| |
| static int __init jz4740_soc_platform_init(void) |
| { |
| return platform_driver_register(&jz4740_pcm_driver); |
| } |
| module_init(jz4740_soc_platform_init); |
| |
| static void __exit jz4740_soc_platform_exit(void) |
| { |
| return platform_driver_unregister(&jz4740_pcm_driver); |
| } |
| module_exit(jz4740_soc_platform_exit); |
| |
| MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>"); |
| MODULE_DESCRIPTION("Ingenic SoC JZ4740 PCM driver"); |
| MODULE_LICENSE("GPL"); |