/* * ALSA PCM interface for the TI DAVINCI processor * * Author: Vladimir Barinov, <vbarinov@embeddedalley.com> * Copyright: (C) 2007 MontaVista Software, Inc., <source@mvista.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. */ #include <linux/module.h> #include <linux/init.h> #include <linux/platform_device.h> #include <linux/slab.h> #include <linux/dma-mapping.h> #include <linux/kernel.h> #include <sound/core.h> #include <sound/pcm.h> #include <sound/pcm_params.h> #include <sound/soc.h> #include <asm/dma.h> #include <mach/edma.h> #include "davinci-pcm.h" static struct snd_pcm_hardware davinci_pcm_hardware = { .info = (SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER | SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID | SNDRV_PCM_INFO_PAUSE), .formats = (SNDRV_PCM_FMTBIT_S16_LE), .rates = (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_16000 | SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000 | SNDRV_PCM_RATE_KNOT), .rate_min = 8000, .rate_max = 96000, .channels_min = 2, .channels_max = 2, .buffer_bytes_max = 128 * 1024, .period_bytes_min = 32, .period_bytes_max = 8 * 1024, .periods_min = 16, .periods_max = 255, .fifo_size = 0, }; struct davinci_runtime_data { spinlock_t lock; int period; /* current DMA period */ int master_lch; /* Master DMA channel */ int slave_lch; /* linked parameter RAM reload slot */ struct davinci_pcm_dma_params *params; /* DMA params */ }; static void davinci_pcm_enqueue_dma(struct snd_pcm_substream *substream) { struct davinci_runtime_data *prtd = substream->runtime->private_data; struct snd_pcm_runtime *runtime = substream->runtime; int lch = prtd->slave_lch; unsigned int period_size; unsigned int dma_offset; dma_addr_t dma_pos; dma_addr_t src, dst; unsigned short src_bidx, dst_bidx; unsigned int data_type; unsigned int count; period_size = snd_pcm_lib_period_bytes(substream); dma_offset = prtd->period * period_size; dma_pos = runtime->dma_addr + dma_offset; pr_debug("davinci_pcm: audio_set_dma_params_play channel = %d " "dma_ptr = %x period_size=%x\n", lch, dma_pos, period_size); data_type = prtd->params->data_type; count = period_size / data_type; if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { src = dma_pos; dst = prtd->params->dma_addr; src_bidx = data_type; dst_bidx = 0; } else { src = prtd->params->dma_addr; dst = dma_pos; src_bidx = 0; dst_bidx = data_type; } edma_set_src(lch, src, INCR, W8BIT); edma_set_dest(lch, dst, INCR, W8BIT); edma_set_src_index(lch, src_bidx, 0); edma_set_dest_index(lch, dst_bidx, 0); edma_set_transfer_params(lch, data_type, count, 1, 0, ASYNC); prtd->period++; if (unlikely(prtd->period >= runtime->periods)) prtd->period = 0; } static void davinci_pcm_dma_irq(unsigned lch, u16 ch_status, void *data) { struct snd_pcm_substream *substream = data; struct davinci_runtime_data *prtd = substream->runtime->private_data; pr_debug("davinci_pcm: lch=%d, status=0x%x\n", lch, ch_status); if (unlikely(ch_status != DMA_COMPLETE)) return; if (snd_pcm_running(substream)) { snd_pcm_period_elapsed(substream); spin_lock(&prtd->lock); davinci_pcm_enqueue_dma(substream); spin_unlock(&prtd->lock); } } static int davinci_pcm_dma_request(struct snd_pcm_substream *substream) { struct davinci_runtime_data *prtd = substream->runtime->private_data; struct snd_soc_pcm_runtime *rtd = substream->private_data; struct davinci_pcm_dma_params *dma_data = rtd->dai->cpu_dai->dma_data; struct edmacc_param p_ram; int ret; if (!dma_data) return -ENODEV; prtd->params = dma_data; /* Request master DMA channel */ ret = edma_alloc_channel(prtd->params->channel, davinci_pcm_dma_irq, substream, EVENTQ_0); if (ret < 0) return ret; prtd->master_lch = ret; /* Request parameter RAM reload slot */ ret = edma_alloc_slot(EDMA_SLOT_ANY); if (ret < 0) { edma_free_channel(prtd->master_lch); return ret; } prtd->slave_lch = ret; /* Issue transfer completion IRQ when the channel completes a * transfer, then always reload from the same slot (by a kind * of loopback link). The completion IRQ handler will update * the reload slot with a new buffer. * * REVISIT save p_ram here after setting up everything except * the buffer and its length (ccnt) ... use it as a template * so davinci_pcm_enqueue_dma() takes less time in IRQ. */ edma_read_slot(prtd->slave_lch, &p_ram); p_ram.opt |= TCINTEN | EDMA_TCC(prtd->master_lch); p_ram.link_bcntrld = prtd->slave_lch << 5; edma_write_slot(prtd->slave_lch, &p_ram); return 0; } static int davinci_pcm_trigger(struct snd_pcm_substream *substream, int cmd) { struct davinci_runtime_data *prtd = substream->runtime->private_data; int ret = 0; spin_lock(&prtd->lock); switch (cmd) { case SNDRV_PCM_TRIGGER_START: case SNDRV_PCM_TRIGGER_RESUME: case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: edma_start(prtd->master_lch); break; case SNDRV_PCM_TRIGGER_STOP: case SNDRV_PCM_TRIGGER_SUSPEND: case SNDRV_PCM_TRIGGER_PAUSE_PUSH: edma_stop(prtd->master_lch); break; default: ret = -EINVAL; break; } spin_unlock(&prtd->lock); return ret; } static int davinci_pcm_prepare(struct snd_pcm_substream *substream) { struct davinci_runtime_data *prtd = substream->runtime->private_data; struct edmacc_param temp; prtd->period = 0; davinci_pcm_enqueue_dma(substream); /* Copy self-linked parameter RAM entry into master channel */ edma_read_slot(prtd->slave_lch, &temp); edma_write_slot(prtd->master_lch, &temp); return 0; } static snd_pcm_uframes_t davinci_pcm_pointer(struct snd_pcm_substream *substream) { struct snd_pcm_runtime *runtime = substream->runtime; struct davinci_runtime_data *prtd = runtime->private_data; unsigned int offset; dma_addr_t count; dma_addr_t src, dst; spin_lock(&prtd->lock); edma_get_position(prtd->master_lch, &src, &dst); if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) count = src - runtime->dma_addr; else count = dst - runtime->dma_addr; spin_unlock(&prtd->lock); offset = bytes_to_frames(runtime, count); if (offset >= runtime->buffer_size) offset = 0; return offset; } static int davinci_pcm_open(struct snd_pcm_substream *substream) { struct snd_pcm_runtime *runtime = substream->runtime; struct davinci_runtime_data *prtd; int ret = 0; snd_soc_set_runtime_hwparams(substream, &davinci_pcm_hardware); prtd = kzalloc(sizeof(struct davinci_runtime_data), GFP_KERNEL); if (prtd == NULL) return -ENOMEM; spin_lock_init(&prtd->lock); runtime->private_data = prtd; ret = davinci_pcm_dma_request(substream); if (ret) { printk(KERN_ERR "davinci_pcm: Failed to get dma channels\n"); kfree(prtd); } return ret; } static int davinci_pcm_close(struct snd_pcm_substream *substream) { struct snd_pcm_runtime *runtime = substream->runtime; struct davinci_runtime_data *prtd = runtime->private_data; edma_unlink(prtd->slave_lch); edma_free_slot(prtd->slave_lch); edma_free_channel(prtd->master_lch); kfree(prtd); return 0; } static int davinci_pcm_hw_params(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *hw_params) { return snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(hw_params)); } static int davinci_pcm_hw_free(struct snd_pcm_substream *substream) { return snd_pcm_lib_free_pages(substream); } static int davinci_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 davinci_pcm_ops = { .open = davinci_pcm_open, .close = davinci_pcm_close, .ioctl = snd_pcm_lib_ioctl, .hw_params = davinci_pcm_hw_params, .hw_free = davinci_pcm_hw_free, .prepare = davinci_pcm_prepare, .trigger = davinci_pcm_trigger, .pointer = davinci_pcm_pointer, .mmap = davinci_pcm_mmap, }; static int davinci_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 = davinci_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_writecombine(pcm->card->dev, size, &buf->addr, GFP_KERNEL); pr_debug("davinci_pcm: preallocate_dma_buffer: area=%p, addr=%p, " "size=%d\n", (void *) buf->area, (void *) buf->addr, size); if (!buf->area) return -ENOMEM; buf->bytes = size; return 0; } static void davinci_pcm_free(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_writecombine(pcm->card->dev, buf->bytes, buf->area, buf->addr); buf->area = NULL; } } static u64 davinci_pcm_dmamask = 0xffffffff; static int davinci_pcm_new(struct snd_card *card, struct snd_soc_dai *dai, struct snd_pcm *pcm) { int ret; if (!card->dev->dma_mask) card->dev->dma_mask = &davinci_pcm_dmamask; if (!card->dev->coherent_dma_mask) card->dev->coherent_dma_mask = 0xffffffff; if (dai->playback.channels_min) { ret = davinci_pcm_preallocate_dma_buffer(pcm, SNDRV_PCM_STREAM_PLAYBACK); if (ret) return ret; } if (dai->capture.channels_min) { ret = davinci_pcm_preallocate_dma_buffer(pcm, SNDRV_PCM_STREAM_CAPTURE); if (ret) return ret; } return 0; } struct snd_soc_platform davinci_soc_platform = { .name = "davinci-audio", .pcm_ops = &davinci_pcm_ops, .pcm_new = davinci_pcm_new, .pcm_free = davinci_pcm_free, }; EXPORT_SYMBOL_GPL(davinci_soc_platform); static int __init davinci_soc_platform_init(void) { return snd_soc_register_platform(&davinci_soc_platform); } module_init(davinci_soc_platform_init); static void __exit davinci_soc_platform_exit(void) { snd_soc_unregister_platform(&davinci_soc_platform); } module_exit(davinci_soc_platform_exit); MODULE_AUTHOR("Vladimir Barinov"); MODULE_DESCRIPTION("TI DAVINCI PCM DMA module"); MODULE_LICENSE("GPL");