static void s3c24xx_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 s3c24xx_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--; s3c_dma_enqueue(substream); } spin_unlock(&prtd->lock); }
static int s3c_dma_hw_params(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params) { struct snd_pcm_runtime *runtime = substream->runtime; struct s3c24xx_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->dai->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, s3c24xx_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 void s3c24xx_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 s3c24xx_runtime_data *prtd; pr_debug("Entered %s\n", __func__); if (result == S3C2410_RES_ABORT || result == S3C2410_RES_ERR) return; prtd = substream->runtime->private_data; /* By Jung */ prtd->dma_pos += prtd->dma_period; if (prtd->dma_pos >= prtd->dma_end) prtd->dma_pos = prtd->dma_start; //if (substream) //fixed 68937 (REVERSE_INULL) prevent defect snd_pcm_period_elapsed(substream); spin_lock(&prtd->lock); if (prtd->state & ST_RUNNING && !s3c_dma_has_circular()) { s3c_dma_enqueue(substream); } spin_unlock(&prtd->lock); }
/* s3c_dma_enqueue * * place a dma buffer onto the queue for the dma system * to handle. */ static void s3c_dma_enqueue(struct snd_pcm_substream *substream) { struct s3c24xx_runtime_data *prtd = substream->runtime->private_data; dma_addr_t pos = prtd->dma_pos; unsigned long len; 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); if (s3c_dma_has_infiniteloop()) { ret = s3c2410_dma_enqueue_ring(prtd->params->channel, substream, pos, prtd->dma_period, limit); if (ret == 0) { prtd->dma_loaded += limit; pos += prtd->dma_period; } } else { while (prtd->dma_loaded < limit) { 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; }