From 4b166da939012905f4c36fedada62067db31948e Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Daniel=20Gl=C3=B6ckner?= Date: Sat, 28 Mar 2009 19:47:01 +0100 Subject: ASoC: Add driver for s6000 I2S interface MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit This patch adds a driver for the I2S interface found on Stretch s6000 family processors. Signed-off-by: Daniel Glöckner Signed-off-by: Mark Brown --- sound/soc/s6000/s6000-pcm.c | 497 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 497 insertions(+) create mode 100644 sound/soc/s6000/s6000-pcm.c (limited to 'sound/soc/s6000/s6000-pcm.c') diff --git a/sound/soc/s6000/s6000-pcm.c b/sound/soc/s6000/s6000-pcm.c new file mode 100644 index 00000000000..83b8028e209 --- /dev/null +++ b/sound/soc/s6000/s6000-pcm.c @@ -0,0 +1,497 @@ +/* + * ALSA PCM interface for the Stetch s6000 family + * + * Author: Daniel Gloeckner, + * Copyright: (C) 2009 emlix GmbH + * + * 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 +#include +#include +#include +#include +#include + +#include +#include +#include +#include + +#include +#include + +#include "s6000-pcm.h" + +#define S6_PCM_PREALLOCATE_SIZE (96 * 1024) +#define S6_PCM_PREALLOCATE_MAX (2048 * 1024) + +static struct snd_pcm_hardware s6000_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 | SNDRV_PCM_INFO_JOINT_DUPLEX), + .formats = (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S32_LE), + .rates = (SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_5512 | \ + SNDRV_PCM_RATE_8000_192000), + .rate_min = 0, + .rate_max = 1562500, + .channels_min = 2, + .channels_max = 8, + .buffer_bytes_max = 0x7ffffff0, + .period_bytes_min = 16, + .period_bytes_max = 0xfffff0, + .periods_min = 2, + .periods_max = 1024, /* no limit */ + .fifo_size = 0, +}; + +struct s6000_runtime_data { + spinlock_t lock; + int period; /* current DMA period */ +}; + +static void s6000_pcm_enqueue_dma(struct snd_pcm_substream *substream) +{ + struct snd_pcm_runtime *runtime = substream->runtime; + struct s6000_runtime_data *prtd = runtime->private_data; + struct snd_soc_pcm_runtime *soc_runtime = substream->private_data; + struct s6000_pcm_dma_params *par = soc_runtime->dai->cpu_dai->dma_data; + int channel; + unsigned int period_size; + unsigned int dma_offset; + dma_addr_t dma_pos; + dma_addr_t src, dst; + + period_size = snd_pcm_lib_period_bytes(substream); + dma_offset = prtd->period * period_size; + dma_pos = runtime->dma_addr + dma_offset; + + if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { + src = dma_pos; + dst = par->sif_out; + channel = par->dma_out; + } else { + src = par->sif_in; + dst = dma_pos; + channel = par->dma_in; + } + + if (!s6dmac_channel_enabled(DMA_MASK_DMAC(channel), + DMA_INDEX_CHNL(channel))) + return; + + if (s6dmac_fifo_full(DMA_MASK_DMAC(channel), DMA_INDEX_CHNL(channel))) { + printk(KERN_ERR "s6000-pcm: fifo full\n"); + return; + } + + BUG_ON(period_size & 15); + s6dmac_put_fifo(DMA_MASK_DMAC(channel), DMA_INDEX_CHNL(channel), + src, dst, period_size); + + prtd->period++; + if (unlikely(prtd->period >= runtime->periods)) + prtd->period = 0; +} + +static irqreturn_t s6000_pcm_irq(int irq, void *data) +{ + struct snd_pcm *pcm = data; + struct snd_soc_pcm_runtime *runtime = pcm->private_data; + struct s6000_pcm_dma_params *params = runtime->dai->cpu_dai->dma_data; + struct s6000_runtime_data *prtd; + unsigned int has_xrun; + int i, ret = IRQ_NONE; + u32 channel[2] = { + [SNDRV_PCM_STREAM_PLAYBACK] = params->dma_out, + [SNDRV_PCM_STREAM_CAPTURE] = params->dma_in + }; + + has_xrun = params->check_xrun(runtime->dai->cpu_dai); + + for (i = 0; i < ARRAY_SIZE(channel); ++i) { + struct snd_pcm_substream *substream = pcm->streams[i].substream; + unsigned int pending; + + if (!channel[i]) + continue; + + if (unlikely(has_xrun & (1 << i)) && + substream->runtime && + snd_pcm_running(substream)) { + dev_dbg(pcm->dev, "xrun\n"); + snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN); + ret = IRQ_HANDLED; + } + + pending = s6dmac_int_sources(DMA_MASK_DMAC(channel[i]), + DMA_INDEX_CHNL(channel[i])); + + if (pending & 1) { + ret = IRQ_HANDLED; + if (likely(substream->runtime && + snd_pcm_running(substream))) { + snd_pcm_period_elapsed(substream); + dev_dbg(pcm->dev, "period elapsed %x %x\n", + s6dmac_cur_src(DMA_MASK_DMAC(channel[i]), + DMA_INDEX_CHNL(channel[i])), + s6dmac_cur_dst(DMA_MASK_DMAC(channel[i]), + DMA_INDEX_CHNL(channel[i]))); + prtd = substream->runtime->private_data; + spin_lock(&prtd->lock); + s6000_pcm_enqueue_dma(substream); + spin_unlock(&prtd->lock); + } + } + + if (unlikely(pending & ~7)) { + if (pending & (1 << 3)) + printk(KERN_WARNING + "s6000-pcm: DMA %x Underflow\n", + channel[i]); + if (pending & (1 << 4)) + printk(KERN_WARNING + "s6000-pcm: DMA %x Overflow\n", + channel[i]); + if (pending & 0x1e0) + printk(KERN_WARNING + "s6000-pcm: DMA %x Master Error " + "(mask %x)\n", + channel[i], pending >> 5); + + } + } + + return ret; +} + +static int s6000_pcm_start(struct snd_pcm_substream *substream) +{ + struct s6000_runtime_data *prtd = substream->runtime->private_data; + struct snd_soc_pcm_runtime *soc_runtime = substream->private_data; + struct s6000_pcm_dma_params *par = soc_runtime->dai->cpu_dai->dma_data; + unsigned long flags; + int srcinc; + u32 dma; + + spin_lock_irqsave(&prtd->lock, flags); + + if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { + srcinc = 1; + dma = par->dma_out; + } else { + srcinc = 0; + dma = par->dma_in; + } + s6dmac_enable_chan(DMA_MASK_DMAC(dma), DMA_INDEX_CHNL(dma), + 1 /* priority 1 (0 is max) */, + 0 /* peripheral requests w/o xfer length mode */, + srcinc /* source address increment */, + srcinc^1 /* destination address increment */, + 0 /* chunksize 0 (skip impossible on this dma) */, + 0 /* source skip after chunk (impossible) */, + 0 /* destination skip after chunk (impossible) */, + 4 /* 16 byte burst size */, + -1 /* don't conserve bandwidth */, + 0 /* low watermark irq descriptor theshold */, + 0 /* disable hardware timestamps */, + 1 /* enable channel */); + + s6000_pcm_enqueue_dma(substream); + s6000_pcm_enqueue_dma(substream); + + spin_unlock_irqrestore(&prtd->lock, flags); + + return 0; +} + +static int s6000_pcm_stop(struct snd_pcm_substream *substream) +{ + struct s6000_runtime_data *prtd = substream->runtime->private_data; + struct snd_soc_pcm_runtime *soc_runtime = substream->private_data; + struct s6000_pcm_dma_params *par = soc_runtime->dai->cpu_dai->dma_data; + unsigned long flags; + u32 channel; + + if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) + channel = par->dma_out; + else + channel = par->dma_in; + + s6dmac_set_terminal_count(DMA_MASK_DMAC(channel), + DMA_INDEX_CHNL(channel), 0); + + spin_lock_irqsave(&prtd->lock, flags); + + s6dmac_disable_chan(DMA_MASK_DMAC(channel), DMA_INDEX_CHNL(channel)); + + spin_unlock_irqrestore(&prtd->lock, flags); + + return 0; +} + +static int s6000_pcm_trigger(struct snd_pcm_substream *substream, int cmd) +{ + struct snd_soc_pcm_runtime *soc_runtime = substream->private_data; + struct s6000_pcm_dma_params *par = soc_runtime->dai->cpu_dai->dma_data; + int ret; + + ret = par->trigger(substream, cmd, 0); + if (ret < 0) + return ret; + + switch (cmd) { + case SNDRV_PCM_TRIGGER_START: + case SNDRV_PCM_TRIGGER_RESUME: + case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: + ret = s6000_pcm_start(substream); + break; + case SNDRV_PCM_TRIGGER_STOP: + case SNDRV_PCM_TRIGGER_SUSPEND: + case SNDRV_PCM_TRIGGER_PAUSE_PUSH: + ret = s6000_pcm_stop(substream); + break; + default: + ret = -EINVAL; + } + if (ret < 0) + return ret; + + return par->trigger(substream, cmd, 1); +} + +static int s6000_pcm_prepare(struct snd_pcm_substream *substream) +{ + struct s6000_runtime_data *prtd = substream->runtime->private_data; + + prtd->period = 0; + + return 0; +} + +static snd_pcm_uframes_t s6000_pcm_pointer(struct snd_pcm_substream *substream) +{ + struct snd_soc_pcm_runtime *soc_runtime = substream->private_data; + struct s6000_pcm_dma_params *par = soc_runtime->dai->cpu_dai->dma_data; + struct snd_pcm_runtime *runtime = substream->runtime; + struct s6000_runtime_data *prtd = runtime->private_data; + unsigned long flags; + unsigned int offset; + dma_addr_t count; + + spin_lock_irqsave(&prtd->lock, flags); + + if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) + count = s6dmac_cur_src(DMA_MASK_DMAC(par->dma_out), + DMA_INDEX_CHNL(par->dma_out)); + else + count = s6dmac_cur_dst(DMA_MASK_DMAC(par->dma_in), + DMA_INDEX_CHNL(par->dma_in)); + + count -= runtime->dma_addr; + + spin_unlock_irqrestore(&prtd->lock, flags); + + offset = bytes_to_frames(runtime, count); + if (unlikely(offset >= runtime->buffer_size)) + offset = 0; + + return offset; +} + +static int s6000_pcm_open(struct snd_pcm_substream *substream) +{ + struct snd_soc_pcm_runtime *soc_runtime = substream->private_data; + struct s6000_pcm_dma_params *par = soc_runtime->dai->cpu_dai->dma_data; + struct snd_pcm_runtime *runtime = substream->runtime; + struct s6000_runtime_data *prtd; + int ret; + + snd_soc_set_runtime_hwparams(substream, &s6000_pcm_hardware); + + ret = snd_pcm_hw_constraint_step(runtime, 0, + SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 16); + if (ret < 0) + return ret; + ret = snd_pcm_hw_constraint_step(runtime, 0, + SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 16); + if (ret < 0) + return ret; + ret = snd_pcm_hw_constraint_integer(runtime, + SNDRV_PCM_HW_PARAM_PERIODS); + if (ret < 0) + return ret; + + if (par->same_rate) { + int rate; + spin_lock(&par->lock); /* needed? */ + rate = par->rate; + spin_unlock(&par->lock); + if (rate != -1) { + ret = snd_pcm_hw_constraint_minmax(runtime, + SNDRV_PCM_HW_PARAM_RATE, + rate, rate); + if (ret < 0) + return ret; + } + } + + prtd = kzalloc(sizeof(struct s6000_runtime_data), GFP_KERNEL); + if (prtd == NULL) + return -ENOMEM; + + spin_lock_init(&prtd->lock); + + runtime->private_data = prtd; + + return 0; +} + +static int s6000_pcm_close(struct snd_pcm_substream *substream) +{ + struct snd_pcm_runtime *runtime = substream->runtime; + struct s6000_runtime_data *prtd = runtime->private_data; + + kfree(prtd); + + return 0; +} + +static int s6000_pcm_hw_params(struct snd_pcm_substream *substream, + struct snd_pcm_hw_params *hw_params) +{ + struct snd_soc_pcm_runtime *soc_runtime = substream->private_data; + struct s6000_pcm_dma_params *par = soc_runtime->dai->cpu_dai->dma_data; + int ret; + ret = snd_pcm_lib_malloc_pages(substream, + params_buffer_bytes(hw_params)); + if (ret < 0) { + printk(KERN_WARNING "s6000-pcm: allocation of memory failed\n"); + return ret; + } + + if (par->same_rate) { + spin_lock(&par->lock); + if (par->rate == -1 || + !(par->in_use & ~(1 << substream->stream))) { + par->rate = params_rate(hw_params); + par->in_use |= 1 << substream->stream; + } else if (params_rate(hw_params) != par->rate) { + snd_pcm_lib_free_pages(substream); + par->in_use &= ~(1 << substream->stream); + ret = -EBUSY; + } + spin_unlock(&par->lock); + } + return ret; +} + +static int s6000_pcm_hw_free(struct snd_pcm_substream *substream) +{ + struct snd_soc_pcm_runtime *soc_runtime = substream->private_data; + struct s6000_pcm_dma_params *par = soc_runtime->dai->cpu_dai->dma_data; + + spin_lock(&par->lock); + par->in_use &= ~(1 << substream->stream); + if (!par->in_use) + par->rate = -1; + spin_unlock(&par->lock); + + return snd_pcm_lib_free_pages(substream); +} + +static struct snd_pcm_ops s6000_pcm_ops = { + .open = s6000_pcm_open, + .close = s6000_pcm_close, + .ioctl = snd_pcm_lib_ioctl, + .hw_params = s6000_pcm_hw_params, + .hw_free = s6000_pcm_hw_free, + .trigger = s6000_pcm_trigger, + .prepare = s6000_pcm_prepare, + .pointer = s6000_pcm_pointer, +}; + +static void s6000_pcm_free(struct snd_pcm *pcm) +{ + struct snd_soc_pcm_runtime *runtime = pcm->private_data; + struct s6000_pcm_dma_params *params = runtime->dai->cpu_dai->dma_data; + + free_irq(params->irq, pcm); + snd_pcm_lib_preallocate_free_for_all(pcm); +} + +static u64 s6000_pcm_dmamask = DMA_32BIT_MASK; + +static int s6000_pcm_new(struct snd_card *card, + struct snd_soc_dai *dai, struct snd_pcm *pcm) +{ + struct snd_soc_pcm_runtime *runtime = pcm->private_data; + struct s6000_pcm_dma_params *params = runtime->dai->cpu_dai->dma_data; + int res; + + if (!card->dev->dma_mask) + card->dev->dma_mask = &s6000_pcm_dmamask; + if (!card->dev->coherent_dma_mask) + card->dev->coherent_dma_mask = DMA_32BIT_MASK; + + if (params->dma_in) { + s6dmac_disable_chan(DMA_MASK_DMAC(params->dma_in), + DMA_INDEX_CHNL(params->dma_in)); + s6dmac_int_sources(DMA_MASK_DMAC(params->dma_in), + DMA_INDEX_CHNL(params->dma_in)); + } + + if (params->dma_out) { + s6dmac_disable_chan(DMA_MASK_DMAC(params->dma_out), + DMA_INDEX_CHNL(params->dma_out)); + s6dmac_int_sources(DMA_MASK_DMAC(params->dma_out), + DMA_INDEX_CHNL(params->dma_out)); + } + + res = request_irq(params->irq, s6000_pcm_irq, IRQF_SHARED, + s6000_soc_platform.name, pcm); + if (res) { + printk(KERN_ERR "s6000-pcm couldn't get IRQ\n"); + return res; + } + + res = snd_pcm_lib_preallocate_pages_for_all(pcm, + SNDRV_DMA_TYPE_DEV, + card->dev, + S6_PCM_PREALLOCATE_SIZE, + S6_PCM_PREALLOCATE_MAX); + if (res) + printk(KERN_WARNING "s6000-pcm: preallocation failed\n"); + + spin_lock_init(¶ms->lock); + params->in_use = 0; + params->rate = -1; + return 0; +} + +struct snd_soc_platform s6000_soc_platform = { + .name = "s6000-audio", + .pcm_ops = &s6000_pcm_ops, + .pcm_new = s6000_pcm_new, + .pcm_free = s6000_pcm_free, +}; +EXPORT_SYMBOL_GPL(s6000_soc_platform); + +static int __init s6000_pcm_init(void) +{ + return snd_soc_register_platform(&s6000_soc_platform); +} +module_init(s6000_pcm_init); + +static void __exit s6000_pcm_exit(void) +{ + snd_soc_unregister_platform(&s6000_soc_platform); +} +module_exit(s6000_pcm_exit); + +MODULE_AUTHOR("Daniel Gloeckner"); +MODULE_DESCRIPTION("Stretch s6000 family PCM DMA module"); +MODULE_LICENSE("GPL"); -- cgit v1.2.3