/* * kirkwood-dma.c * * (c) 2010 Arnaud Patard * (c) 2010 Arnaud Patard * * 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 #include #include #include #include #include #include #include #include #include "kirkwood.h" static struct kirkwood_dma_data *kirkwood_priv(struct snd_pcm_substream *subs) { struct snd_soc_pcm_runtime *soc_runtime = subs->private_data; return snd_soc_dai_get_drvdata(soc_runtime->cpu_dai); } static struct snd_pcm_hardware kirkwood_dma_snd_hw = { .info = SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID | SNDRV_PCM_INFO_BLOCK_TRANSFER | SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_NO_PERIOD_WAKEUP, .buffer_bytes_max = KIRKWOOD_SND_MAX_BUFFER_BYTES, .period_bytes_min = KIRKWOOD_SND_MIN_PERIOD_BYTES, .period_bytes_max = KIRKWOOD_SND_MAX_PERIOD_BYTES, .periods_min = KIRKWOOD_SND_MIN_PERIODS, .periods_max = KIRKWOOD_SND_MAX_PERIODS, .fifo_size = 0, }; static irqreturn_t kirkwood_dma_irq(int irq, void *dev_id) { struct kirkwood_dma_data *priv = dev_id; unsigned long mask, status, cause; mask = readl(priv->io + KIRKWOOD_INT_MASK); status = readl(priv->io + KIRKWOOD_INT_CAUSE) & mask; cause = readl(priv->io + KIRKWOOD_ERR_CAUSE); if (unlikely(cause)) { printk(KERN_WARNING "%s: got err interrupt 0x%lx\n", __func__, cause); writel(cause, priv->io + KIRKWOOD_ERR_CAUSE); } /* we've enabled only bytes interrupts ... */ if (status & ~(KIRKWOOD_INT_CAUSE_PLAY_BYTES | \ KIRKWOOD_INT_CAUSE_REC_BYTES)) { printk(KERN_WARNING "%s: unexpected interrupt %lx\n", __func__, status); return IRQ_NONE; } /* ack int */ writel(status, priv->io + KIRKWOOD_INT_CAUSE); if (status & KIRKWOOD_INT_CAUSE_PLAY_BYTES) snd_pcm_period_elapsed(priv->substream_play); if (status & KIRKWOOD_INT_CAUSE_REC_BYTES) snd_pcm_period_elapsed(priv->substream_rec); return IRQ_HANDLED; } static void kirkwood_dma_conf_mbus_windows(void __iomem *base, int win, unsigned long dma, const struct mbus_dram_target_info *dram) { int i; /* First disable and clear windows */ writel(0, base + KIRKWOOD_AUDIO_WIN_CTRL_REG(win)); writel(0, base + KIRKWOOD_AUDIO_WIN_BASE_REG(win)); /* try to find matching cs for current dma address */ for (i = 0; i < dram->num_cs; i++) { const struct mbus_dram_window *cs = dram->cs + i; if ((cs->base & 0xffff0000) < (dma & 0xffff0000)) { writel(cs->base & 0xffff0000, base + KIRKWOOD_AUDIO_WIN_BASE_REG(win)); writel(((cs->size - 1) & 0xffff0000) | (cs->mbus_attr << 8) | (dram->mbus_dram_target_id << 4) | 1, base + KIRKWOOD_AUDIO_WIN_CTRL_REG(win)); } } } static int kirkwood_dma_open(struct snd_pcm_substream *substream) { int err; struct snd_pcm_runtime *runtime = substream->runtime; struct kirkwood_dma_data *priv = kirkwood_priv(substream); const struct mbus_dram_target_info *dram; unsigned long addr; snd_soc_set_runtime_hwparams(substream, &kirkwood_dma_snd_hw); /* Ensure that all constraints linked to dma burst are fulfilled */ err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, priv->burst * 2, KIRKWOOD_AUDIO_BUF_MAX-1); if (err < 0) return err; err = snd_pcm_hw_constraint_step(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, priv->burst); if (err < 0) return err; err = snd_pcm_hw_constraint_step(substream->runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, priv->burst); if (err < 0) return err; if (!priv->substream_play && !priv->substream_rec) { err = request_irq(priv->irq, kirkwood_dma_irq, IRQF_SHARED, "kirkwood-i2s", priv); if (err) return err; /* * Enable Error interrupts. We're only ack'ing them but * it's useful for diagnostics */ writel((unsigned int)-1, priv->io + KIRKWOOD_ERR_MASK); } dram = mv_mbus_dram_info(); addr = substream->dma_buffer.addr; if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { if (priv->substream_play) return -EBUSY; priv->substream_play = substream; kirkwood_dma_conf_mbus_windows(priv->io, KIRKWOOD_PLAYBACK_WIN, addr, dram); } else { if (priv->substream_rec) return -EBUSY; priv->substream_rec = substream; kirkwood_dma_conf_mbus_windows(priv->io, KIRKWOOD_RECORD_WIN, addr, dram); } return 0; } static int kirkwood_dma_close(struct snd_pcm_substream *substream) { struct kirkwood_dma_data *priv = kirkwood_priv(substream); if (!priv) return 0; if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) priv->substream_play = NULL; else priv->substream_rec = NULL; if (!priv->substream_play && !priv->substream_rec) { writel(0, priv->io + KIRKWOOD_ERR_MASK); free_irq(priv->irq, priv); } return 0; } static int kirkwood_dma_hw_params(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params) { struct snd_pcm_runtime *runtime = substream->runtime; snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer); runtime->dma_bytes = params_buffer_bytes(params); return 0; } static int kirkwood_dma_hw_free(struct snd_pcm_substream *substream) { snd_pcm_set_runtime_buffer(substream, NULL); return 0; } static int kirkwood_dma_prepare(struct snd_pcm_substream *substream) { struct snd_pcm_runtime *runtime = substream->runtime; struct kirkwood_dma_data *priv = kirkwood_priv(substream); unsigned long size, count; /* compute buffer size in term of "words" as requested in specs */ size = frames_to_bytes(runtime, runtime->buffer_size); size = (size>>2)-1; count = snd_pcm_lib_period_bytes(substream); if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { writel(count, priv->io + KIRKWOOD_PLAY_BYTE_INT_COUNT); writel(runtime->dma_addr, priv->io + KIRKWOOD_PLAY_BUF_ADDR); writel(size, priv->io + KIRKWOOD_PLAY_BUF_SIZE); } else { writel(count, priv->io + KIRKWOOD_REC_BYTE_INT_COUNT); writel(runtime->dma_addr, priv->io + KIRKWOOD_REC_BUF_ADDR); writel(size, priv->io + KIRKWOOD_REC_BUF_SIZE); } return 0; } static snd_pcm_uframes_t kirkwood_dma_pointer(struct snd_pcm_substream *substream) { struct kirkwood_dma_data *priv = kirkwood_priv(substream); snd_pcm_uframes_t count; if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) count = bytes_to_frames(substream->runtime, readl(priv->io + KIRKWOOD_PLAY_BYTE_COUNT)); else count = bytes_to_frames(substream->runtime, readl(priv->io + KIRKWOOD_REC_BYTE_COUNT)); return count; } static const struct snd_pcm_ops kirkwood_dma_ops = { .open = kirkwood_dma_open, .close = kirkwood_dma_close, .ioctl = snd_pcm_lib_ioctl, .hw_params = kirkwood_dma_hw_params, .hw_free = kirkwood_dma_hw_free, .prepare = kirkwood_dma_prepare, .pointer = kirkwood_dma_pointer, }; static int kirkwood_dma_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 = kirkwood_dma_snd_hw.buffer_bytes_max; buf->dev.type = SNDRV_DMA_TYPE_DEV; buf->dev.dev = pcm->card->dev; buf->area = dma_alloc_coherent(pcm->card->dev, size, &buf->addr, GFP_KERNEL); if (!buf->area) return -ENOMEM; buf->bytes = size; buf->private_data = NULL; return 0; } static int kirkwood_dma_new(struct snd_soc_pcm_runtime *rtd) { struct snd_card *card = rtd->card->snd_card; struct snd_pcm *pcm = rtd->pcm; int ret; ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32)); if (ret) return ret; if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) { ret = kirkwood_dma_preallocate_dma_buffer(pcm, SNDRV_PCM_STREAM_PLAYBACK); if (ret) return ret; } if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) { ret = kirkwood_dma_preallocate_dma_buffer(pcm, SNDRV_PCM_STREAM_CAPTURE); if (ret) return ret; } return 0; } static void kirkwood_dma_free_dma_buffers(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_coherent(pcm->card->dev, buf->bytes, buf->area, buf->addr); buf->area = NULL; } } struct snd_soc_platform_driver kirkwood_soc_platform = { .ops = &kirkwood_dma_ops, .pcm_new = kirkwood_dma_new, .pcm_free = kirkwood_dma_free_dma_buffers, };