| /* |
| * dma.c -- ALSA Soc Audio Layer |
| * |
| * (c) 2006 Wolfson Microelectronics PLC. |
| * Graeme Gregory graeme.gregory@wolfsonmicro.com or linux@wolfsonmicro.com |
| * |
| * Copyright 2004-2005 Simtec Electronics |
| * http://armlinux.simtec.co.uk/ |
| * Ben Dooks <ben@simtec.co.uk> |
| * |
| * 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. |
| */ |
| |
| #include <linux/slab.h> |
| #include <linux/dma-mapping.h> |
| |
| #include <sound/soc.h> |
| #include <sound/pcm_params.h> |
| |
| #include <asm/dma.h> |
| #include <mach/hardware.h> |
| #include <mach/dma.h> |
| |
| #include "dma.h" |
| |
| #define ST_RUNNING (1<<0) |
| #define ST_OPENED (1<<1) |
| |
| static const struct snd_pcm_hardware dma_hardware = { |
| .info = SNDRV_PCM_INFO_INTERLEAVED | |
| SNDRV_PCM_INFO_BLOCK_TRANSFER | |
| SNDRV_PCM_INFO_MMAP | |
| SNDRV_PCM_INFO_MMAP_VALID | |
| SNDRV_PCM_INFO_PAUSE | |
| SNDRV_PCM_INFO_RESUME, |
| .formats = SNDRV_PCM_FMTBIT_S16_LE | |
| SNDRV_PCM_FMTBIT_U16_LE | |
| SNDRV_PCM_FMTBIT_U8 | |
| SNDRV_PCM_FMTBIT_S8, |
| .channels_min = 2, |
| .channels_max = 2, |
| .buffer_bytes_max = 128*1024, |
| .period_bytes_min = PAGE_SIZE, |
| .period_bytes_max = PAGE_SIZE*2, |
| .periods_min = 2, |
| .periods_max = 128, |
| .fifo_size = 32, |
| }; |
| |
| struct runtime_data { |
| spinlock_t lock; |
| int state; |
| unsigned int dma_loaded; |
| unsigned int dma_limit; |
| unsigned int dma_period; |
| dma_addr_t dma_start; |
| dma_addr_t dma_pos; |
| dma_addr_t dma_end; |
| struct s3c_dma_params *params; |
| }; |
| |
| /* dma_enqueue |
| * |
| * place a dma buffer onto the queue for the dma system |
| * to handle. |
| */ |
| static void dma_enqueue(struct snd_pcm_substream *substream) |
| { |
| struct runtime_data *prtd = substream->runtime->private_data; |
| dma_addr_t pos = prtd->dma_pos; |
| unsigned int limit; |
| int ret; |
| |
| pr_debug("Entered %s\n", __func__); |
| |
| if (s3c_dma_has_circular()) |
| limit = (prtd->dma_end - prtd->dma_start) / prtd->dma_period; |
| else |
| limit = prtd->dma_limit; |
| |
| pr_debug("%s: loaded %d, limit %d\n", |
| __func__, prtd->dma_loaded, limit); |
| |
| while (prtd->dma_loaded < limit) { |
| unsigned long len = prtd->dma_period; |
| |
| pr_debug("dma_loaded: %d\n", prtd->dma_loaded); |
| |
| if ((pos + len) > prtd->dma_end) { |
| len = prtd->dma_end - pos; |
| pr_debug("%s: corrected dma len %ld\n", __func__, len); |
| } |
| |
| ret = s3c2410_dma_enqueue(prtd->params->channel, |
| substream, pos, len); |
| |
| if (ret == 0) { |
| prtd->dma_loaded++; |
| pos += prtd->dma_period; |
| if (pos >= prtd->dma_end) |
| pos = prtd->dma_start; |
| } else |
| break; |
| } |
| |
| prtd->dma_pos = pos; |
| } |
| |
| static void audio_buffdone(struct s3c2410_dma_chan *channel, |
| void *dev_id, int size, |
| enum s3c2410_dma_buffresult result) |
| { |
| struct snd_pcm_substream *substream = dev_id; |
| struct runtime_data *prtd; |
| |
| pr_debug("Entered %s\n", __func__); |
| |
| if (result == S3C2410_RES_ABORT || result == S3C2410_RES_ERR) |
| return; |
| |
| prtd = substream->runtime->private_data; |
| |
| if (substream) |
| snd_pcm_period_elapsed(substream); |
| |
| spin_lock(&prtd->lock); |
| if (prtd->state & ST_RUNNING && !s3c_dma_has_circular()) { |
| prtd->dma_loaded--; |
| dma_enqueue(substream); |
| } |
| |
| spin_unlock(&prtd->lock); |
| } |
| |
| static int dma_hw_params(struct snd_pcm_substream *substream, |
| struct snd_pcm_hw_params *params) |
| { |
| struct snd_pcm_runtime *runtime = substream->runtime; |
| struct runtime_data *prtd = runtime->private_data; |
| struct snd_soc_pcm_runtime *rtd = substream->private_data; |
| unsigned long totbytes = params_buffer_bytes(params); |
| struct s3c_dma_params *dma = |
| snd_soc_dai_get_dma_data(rtd->cpu_dai, substream); |
| int ret = 0; |
| |
| |
| pr_debug("Entered %s\n", __func__); |
| |
| /* return if this is a bufferless transfer e.g. |
| * codec <--> BT codec or GSM modem -- lg FIXME */ |
| if (!dma) |
| return 0; |
| |
| /* this may get called several times by oss emulation |
| * with different params -HW */ |
| if (prtd->params == NULL) { |
| /* prepare DMA */ |
| prtd->params = dma; |
| |
| pr_debug("params %p, client %p, channel %d\n", prtd->params, |
| prtd->params->client, prtd->params->channel); |
| |
| ret = s3c2410_dma_request(prtd->params->channel, |
| prtd->params->client, NULL); |
| |
| if (ret < 0) { |
| printk(KERN_ERR "failed to get dma channel\n"); |
| return ret; |
| } |
| |
| /* use the circular buffering if we have it available. */ |
| if (s3c_dma_has_circular()) |
| s3c2410_dma_setflags(prtd->params->channel, |
| S3C2410_DMAF_CIRCULAR); |
| } |
| |
| s3c2410_dma_set_buffdone_fn(prtd->params->channel, |
| audio_buffdone); |
| |
| snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer); |
| |
| runtime->dma_bytes = totbytes; |
| |
| spin_lock_irq(&prtd->lock); |
| prtd->dma_loaded = 0; |
| prtd->dma_limit = runtime->hw.periods_min; |
| 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 + totbytes; |
| spin_unlock_irq(&prtd->lock); |
| |
| return 0; |
| } |
| |
| static int dma_hw_free(struct snd_pcm_substream *substream) |
| { |
| struct runtime_data *prtd = substream->runtime->private_data; |
| |
| pr_debug("Entered %s\n", __func__); |
| |
| /* TODO - do we need to ensure DMA flushed */ |
| snd_pcm_set_runtime_buffer(substream, NULL); |
| |
| if (prtd->params) { |
| s3c2410_dma_free(prtd->params->channel, prtd->params->client); |
| prtd->params = NULL; |
| } |
| |
| return 0; |
| } |
| |
| static int dma_prepare(struct snd_pcm_substream *substream) |
| { |
| struct runtime_data *prtd = substream->runtime->private_data; |
| int ret = 0; |
| |
| pr_debug("Entered %s\n", __func__); |
| |
| /* return if this is a bufferless transfer e.g. |
| * codec <--> BT codec or GSM modem -- lg FIXME */ |
| if (!prtd->params) |
| return 0; |
| |
| /* channel needs configuring for mem=>device, increment memory addr, |
| * sync to pclk, half-word transfers to the IIS-FIFO. */ |
| if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { |
| s3c2410_dma_devconfig(prtd->params->channel, |
| S3C2410_DMASRC_MEM, |
| prtd->params->dma_addr); |
| } else { |
| s3c2410_dma_devconfig(prtd->params->channel, |
| S3C2410_DMASRC_HW, |
| prtd->params->dma_addr); |
| } |
| |
| s3c2410_dma_config(prtd->params->channel, |
| prtd->params->dma_size); |
| |
| /* flush the DMA channel */ |
| s3c2410_dma_ctrl(prtd->params->channel, S3C2410_DMAOP_FLUSH); |
| prtd->dma_loaded = 0; |
| prtd->dma_pos = prtd->dma_start; |
| |
| /* enqueue dma buffers */ |
| dma_enqueue(substream); |
| |
| return ret; |
| } |
| |
| static int dma_trigger(struct snd_pcm_substream *substream, int cmd) |
| { |
| struct runtime_data *prtd = substream->runtime->private_data; |
| int ret = 0; |
| |
| pr_debug("Entered %s\n", __func__); |
| |
| spin_lock(&prtd->lock); |
| |
| switch (cmd) { |
| case SNDRV_PCM_TRIGGER_START: |
| case SNDRV_PCM_TRIGGER_RESUME: |
| case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: |
| prtd->state |= ST_RUNNING; |
| s3c2410_dma_ctrl(prtd->params->channel, S3C2410_DMAOP_START); |
| break; |
| |
| case SNDRV_PCM_TRIGGER_STOP: |
| case SNDRV_PCM_TRIGGER_SUSPEND: |
| case SNDRV_PCM_TRIGGER_PAUSE_PUSH: |
| prtd->state &= ~ST_RUNNING; |
| s3c2410_dma_ctrl(prtd->params->channel, S3C2410_DMAOP_STOP); |
| break; |
| |
| default: |
| ret = -EINVAL; |
| break; |
| } |
| |
| spin_unlock(&prtd->lock); |
| |
| return ret; |
| } |
| |
| static snd_pcm_uframes_t |
| dma_pointer(struct snd_pcm_substream *substream) |
| { |
| struct snd_pcm_runtime *runtime = substream->runtime; |
| struct runtime_data *prtd = runtime->private_data; |
| unsigned long res; |
| dma_addr_t src, dst; |
| |
| pr_debug("Entered %s\n", __func__); |
| |
| spin_lock(&prtd->lock); |
| s3c2410_dma_getposition(prtd->params->channel, &src, &dst); |
| |
| if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) |
| res = dst - prtd->dma_start; |
| else |
| res = src - prtd->dma_start; |
| |
| spin_unlock(&prtd->lock); |
| |
| pr_debug("Pointer %x %x\n", src, dst); |
| |
| /* we seem to be getting the odd error from the pcm library due |
| * to out-of-bounds pointers. this is maybe due to the dma engine |
| * not having loaded the new values for the channel before being |
| * called... (todo - fix ) |
| */ |
| |
| if (res >= snd_pcm_lib_buffer_bytes(substream)) { |
| if (res == snd_pcm_lib_buffer_bytes(substream)) |
| res = 0; |
| } |
| |
| return bytes_to_frames(substream->runtime, res); |
| } |
| |
| static int dma_open(struct snd_pcm_substream *substream) |
| { |
| struct snd_pcm_runtime *runtime = substream->runtime; |
| struct runtime_data *prtd; |
| |
| pr_debug("Entered %s\n", __func__); |
| |
| snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS); |
| snd_soc_set_runtime_hwparams(substream, &dma_hardware); |
| |
| prtd = kzalloc(sizeof(struct runtime_data), GFP_KERNEL); |
| if (prtd == NULL) |
| return -ENOMEM; |
| |
| spin_lock_init(&prtd->lock); |
| |
| runtime->private_data = prtd; |
| return 0; |
| } |
| |
| static int dma_close(struct snd_pcm_substream *substream) |
| { |
| struct snd_pcm_runtime *runtime = substream->runtime; |
| struct runtime_data *prtd = runtime->private_data; |
| |
| pr_debug("Entered %s\n", __func__); |
| |
| if (!prtd) |
| pr_debug("dma_close called with prtd == NULL\n"); |
| |
| kfree(prtd); |
| |
| return 0; |
| } |
| |
| static int dma_mmap(struct snd_pcm_substream *substream, |
| struct vm_area_struct *vma) |
| { |
| struct snd_pcm_runtime *runtime = substream->runtime; |
| |
| pr_debug("Entered %s\n", __func__); |
| |
| return dma_mmap_writecombine(substream->pcm->card->dev, vma, |
| runtime->dma_area, |
| runtime->dma_addr, |
| runtime->dma_bytes); |
| } |
| |
| static struct snd_pcm_ops dma_ops = { |
| .open = dma_open, |
| .close = dma_close, |
| .ioctl = snd_pcm_lib_ioctl, |
| .hw_params = dma_hw_params, |
| .hw_free = dma_hw_free, |
| .prepare = dma_prepare, |
| .trigger = dma_trigger, |
| .pointer = dma_pointer, |
| .mmap = dma_mmap, |
| }; |
| |
| static int 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 = dma_hardware.buffer_bytes_max; |
| |
| pr_debug("Entered %s\n", __func__); |
| |
| 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); |
| if (!buf->area) |
| return -ENOMEM; |
| buf->bytes = size; |
| return 0; |
| } |
| |
| static void dma_free_dma_buffers(struct snd_pcm *pcm) |
| { |
| struct snd_pcm_substream *substream; |
| struct snd_dma_buffer *buf; |
| int stream; |
| |
| pr_debug("Entered %s\n", __func__); |
| |
| 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 dma_mask = DMA_BIT_MASK(32); |
| |
| static int dma_new(struct snd_soc_pcm_runtime *rtd) |
| { |
| struct snd_card *card = rtd->card->snd_card; |
| struct snd_soc_dai *dai = rtd->cpu_dai; |
| struct snd_pcm *pcm = rtd->pcm; |
| int ret = 0; |
| |
| pr_debug("Entered %s\n", __func__); |
| |
| if (!card->dev->dma_mask) |
| card->dev->dma_mask = &dma_mask; |
| if (!card->dev->coherent_dma_mask) |
| card->dev->coherent_dma_mask = 0xffffffff; |
| |
| if (dai->driver->playback.channels_min) { |
| ret = preallocate_dma_buffer(pcm, |
| SNDRV_PCM_STREAM_PLAYBACK); |
| if (ret) |
| goto out; |
| } |
| |
| if (dai->driver->capture.channels_min) { |
| ret = preallocate_dma_buffer(pcm, |
| SNDRV_PCM_STREAM_CAPTURE); |
| if (ret) |
| goto out; |
| } |
| out: |
| return ret; |
| } |
| |
| static struct snd_soc_platform_driver samsung_asoc_platform = { |
| .ops = &dma_ops, |
| .pcm_new = dma_new, |
| .pcm_free = dma_free_dma_buffers, |
| }; |
| |
| static int __devinit samsung_asoc_platform_probe(struct platform_device *pdev) |
| { |
| return snd_soc_register_platform(&pdev->dev, &samsung_asoc_platform); |
| } |
| |
| static int __devexit samsung_asoc_platform_remove(struct platform_device *pdev) |
| { |
| snd_soc_unregister_platform(&pdev->dev); |
| return 0; |
| } |
| |
| static struct platform_driver asoc_dma_driver = { |
| .driver = { |
| .name = "samsung-audio", |
| .owner = THIS_MODULE, |
| }, |
| |
| .probe = samsung_asoc_platform_probe, |
| .remove = __devexit_p(samsung_asoc_platform_remove), |
| }; |
| |
| static int __init samsung_asoc_init(void) |
| { |
| return platform_driver_register(&asoc_dma_driver); |
| } |
| module_init(samsung_asoc_init); |
| |
| static void __exit samsung_asoc_exit(void) |
| { |
| platform_driver_unregister(&asoc_dma_driver); |
| } |
| module_exit(samsung_asoc_exit); |
| |
| MODULE_AUTHOR("Ben Dooks, <ben@simtec.co.uk>"); |
| MODULE_DESCRIPTION("Samsung ASoC DMA Driver"); |
| MODULE_LICENSE("GPL"); |
| MODULE_ALIAS("platform:samsung-audio"); |