diff options
Diffstat (limited to 'kernel/sound/soc/kirkwood/kirkwood-dma.c')
| -rw-r--r-- | kernel/sound/soc/kirkwood/kirkwood-dma.c | 321 |
1 files changed, 321 insertions, 0 deletions
diff --git a/kernel/sound/soc/kirkwood/kirkwood-dma.c b/kernel/sound/soc/kirkwood/kirkwood-dma.c new file mode 100644 index 000000000..4cf224595 --- /dev/null +++ b/kernel/sound/soc/kirkwood/kirkwood-dma.c @@ -0,0 +1,321 @@ +/* + * kirkwood-dma.c + * + * (c) 2010 Arnaud Patard <apatard@mandriva.com> + * (c) 2010 Arnaud Patard <arnaud.patard@rtp-net.org> + * + * 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/init.h> +#include <linux/module.h> +#include <linux/device.h> +#include <linux/io.h> +#include <linux/slab.h> +#include <linux/interrupt.h> +#include <linux/dma-mapping.h> +#include <linux/mbus.h> +#include <sound/soc.h> +#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 -EBUSY; + + /* + * 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) { + priv->substream_play = substream; + kirkwood_dma_conf_mbus_windows(priv->io, + KIRKWOOD_PLAYBACK_WIN, addr, dram); + } else { + 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 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, +}; |