diff options
| -rw-r--r-- | sound/soc/pxa/pxa2xx-pcm.c | 363 | ||||
| -rw-r--r-- | sound/soc/pxa/pxa2xx-pcm.h | 48 |
2 files changed, 411 insertions, 0 deletions
diff --git a/sound/soc/pxa/pxa2xx-pcm.c b/sound/soc/pxa/pxa2xx-pcm.c new file mode 100644 index 00000000000..ff32f892287 --- /dev/null +++ b/sound/soc/pxa/pxa2xx-pcm.c @@ -0,0 +1,363 @@ +/* + * linux/sound/arm/pxa2xx-pcm.c -- ALSA PCM interface for the Intel PXA2xx chip + * + * Author: Nicolas Pitre + * Created: Nov 30, 2004 + * Copyright: (C) 2004 MontaVista Software, Inc. + * + * 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 <linux/module.h> +#include <linux/init.h> +#include <linux/platform_device.h> +#include <linux/slab.h> +#include <linux/dma-mapping.h> + +#include <sound/driver.h> +#include <sound/core.h> +#include <sound/pcm.h> +#include <sound/pcm_params.h> +#include <sound/soc.h> + +#include <asm/dma.h> +#include <asm/hardware.h> +#include <asm/arch/pxa-regs.h> +#include <asm/arch/audio.h> + +#include "pxa2xx-pcm.h" + +static const struct snd_pcm_hardware pxa2xx_pcm_hardware = { + .info = SNDRV_PCM_INFO_MMAP | + SNDRV_PCM_INFO_MMAP_VALID | + SNDRV_PCM_INFO_INTERLEAVED | + SNDRV_PCM_INFO_PAUSE | + SNDRV_PCM_INFO_RESUME, + .formats = SNDRV_PCM_FMTBIT_S16_LE | + SNDRV_PCM_FMTBIT_S24_LE | + SNDRV_PCM_FMTBIT_S32_LE, + .period_bytes_min = 32, + .period_bytes_max = 8192 - 32, + .periods_min = 1, + .periods_max = PAGE_SIZE/sizeof(pxa_dma_desc), + .buffer_bytes_max = 128 * 1024, + .fifo_size = 32, +}; + +struct pxa2xx_runtime_data { + int dma_ch; + struct pxa2xx_pcm_dma_params *params; + pxa_dma_desc *dma_desc_array; + dma_addr_t dma_desc_array_phys; +}; + +static void pxa2xx_pcm_dma_irq(int dma_ch, void *dev_id) +{ + struct snd_pcm_substream *substream = dev_id; + struct pxa2xx_runtime_data *prtd = substream->runtime->private_data; + int dcsr; + + dcsr = DCSR(dma_ch); + DCSR(dma_ch) = dcsr & ~DCSR_STOPIRQEN; + + if (dcsr & DCSR_ENDINTR) { + snd_pcm_period_elapsed(substream); + } else { + printk( KERN_ERR "%s: DMA error on channel %d (DCSR=%#x)\n", + prtd->params->name, dma_ch, dcsr ); + } +} + +static int pxa2xx_pcm_hw_params(struct snd_pcm_substream *substream, + struct snd_pcm_hw_params *params) +{ + struct snd_pcm_runtime *runtime = substream->runtime; + struct pxa2xx_runtime_data *prtd = runtime->private_data; + struct snd_soc_pcm_runtime *rtd = substream->private_data; + struct pxa2xx_pcm_dma_params *dma = rtd->cpu_dai->dma_data; + size_t totsize = params_buffer_bytes(params); + size_t period = params_period_bytes(params); + pxa_dma_desc *dma_desc; + dma_addr_t dma_buff_phys, next_desc_phys; + int ret; + + /* this may get called several times by oss emulation + * with different params */ + if (prtd->params == NULL) { + prtd->params = dma; + ret = pxa_request_dma(prtd->params->name, DMA_PRIO_LOW, + pxa2xx_pcm_dma_irq, substream); + if (ret < 0) + return ret; + prtd->dma_ch = ret; + } else if (prtd->params != dma) { + pxa_free_dma(prtd->dma_ch); + prtd->params = dma; + ret = pxa_request_dma(prtd->params->name, DMA_PRIO_LOW, + pxa2xx_pcm_dma_irq, substream); + if (ret < 0) + return ret; + prtd->dma_ch = ret; + } + + snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer); + runtime->dma_bytes = totsize; + + dma_desc = prtd->dma_desc_array; + next_desc_phys = prtd->dma_desc_array_phys; + dma_buff_phys = runtime->dma_addr; + do { + next_desc_phys += sizeof(pxa_dma_desc); + dma_desc->ddadr = next_desc_phys; + if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { + dma_desc->dsadr = dma_buff_phys; + dma_desc->dtadr = prtd->params->dev_addr; + } else { + dma_desc->dsadr = prtd->params->dev_addr; + dma_desc->dtadr = dma_buff_phys; + } + if (period > totsize) + period = totsize; + dma_desc->dcmd = prtd->params->dcmd | period | DCMD_ENDIRQEN; + dma_desc++; + dma_buff_phys += period; + } while (totsize -= period); + dma_desc[-1].ddadr = prtd->dma_desc_array_phys; + + return 0; +} + +static int pxa2xx_pcm_hw_free(struct snd_pcm_substream *substream) +{ + struct pxa2xx_runtime_data *prtd = substream->runtime->private_data; + + if (prtd && prtd->params) + *prtd->params->drcmr = 0; + + if (prtd->dma_ch) { + snd_pcm_set_runtime_buffer(substream, NULL); + pxa_free_dma(prtd->dma_ch); + prtd->dma_ch = 0; + } + + return 0; +} + +static int pxa2xx_pcm_prepare(struct snd_pcm_substream *substream) +{ + struct pxa2xx_runtime_data *prtd = substream->runtime->private_data; + + DCSR(prtd->dma_ch) &= ~DCSR_RUN; + DCSR(prtd->dma_ch) = 0; + DCMD(prtd->dma_ch) = 0; + *prtd->params->drcmr = prtd->dma_ch | DRCMR_MAPVLD; + + return 0; +} + +static int pxa2xx_pcm_trigger(struct snd_pcm_substream *substream, int cmd) +{ + struct pxa2xx_runtime_data *prtd = substream->runtime->private_data; + int ret = 0; + + switch (cmd) { + case SNDRV_PCM_TRIGGER_START: + DDADR(prtd->dma_ch) = prtd->dma_desc_array_phys; + DCSR(prtd->dma_ch) = DCSR_RUN; + break; + + case SNDRV_PCM_TRIGGER_STOP: + case SNDRV_PCM_TRIGGER_SUSPEND: + case SNDRV_PCM_TRIGGER_PAUSE_PUSH: + DCSR(prtd->dma_ch) &= ~DCSR_RUN; + break; + + case SNDRV_PCM_TRIGGER_RESUME: + DCSR(prtd->dma_ch) |= DCSR_RUN; + break; + case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: + DDADR(prtd->dma_ch) = prtd->dma_desc_array_phys; + DCSR(prtd->dma_ch) |= DCSR_RUN; + break; + + default: + ret = -EINVAL; + } + + return ret; +} + +static snd_pcm_uframes_t +pxa2xx_pcm_pointer(struct snd_pcm_substream *substream) +{ + struct snd_pcm_runtime *runtime = substream->runtime; + struct pxa2xx_runtime_data *prtd = runtime->private_data; + + dma_addr_t ptr = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ? + DSADR(prtd->dma_ch) : DTADR(prtd->dma_ch); + snd_pcm_uframes_t x = bytes_to_frames(runtime, ptr - runtime->dma_addr); + + if (x == runtime->buffer_size) + x = 0; + return x; +} + +static int pxa2xx_pcm_open(struct snd_pcm_substream *substream) +{ + struct snd_pcm_runtime *runtime = substream->runtime; + struct pxa2xx_runtime_data *prtd; + int ret; + + snd_soc_set_runtime_hwparams(substream, &pxa2xx_pcm_hardware); + + /* + * For mysterious reasons (and despite what the manual says) + * playback samples are lost if the DMA count is not a multiple + * of the DMA burst size. Let's add a rule to enforce that. + */ + ret = snd_pcm_hw_constraint_step(runtime, 0, + SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 32); + if (ret) + goto out; + + ret = snd_pcm_hw_constraint_step(runtime, 0, + SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 32); + if (ret) + goto out; + + prtd = kzalloc(sizeof(struct pxa2xx_runtime_data), GFP_KERNEL); + if (prtd == NULL) { + ret = -ENOMEM; + goto out; + } + + prtd->dma_desc_array = + dma_alloc_writecombine(substream->pcm->card->dev, PAGE_SIZE, + &prtd->dma_desc_array_phys, GFP_KERNEL); + if (!prtd->dma_desc_array) { + ret = -ENOMEM; + goto err1; + } + + runtime->private_data = prtd; + return 0; + + err1: + kfree(prtd); + out: + return ret; +} + +static int pxa2xx_pcm_close(struct snd_pcm_substream *substream) +{ + struct snd_pcm_runtime *runtime = substream->runtime; + struct pxa2xx_runtime_data *prtd = runtime->private_data; + + dma_free_writecombine(substream->pcm->card->dev, PAGE_SIZE, + prtd->dma_desc_array, prtd->dma_desc_array_phys); + kfree(prtd); + return 0; +} + +static int pxa2xx_pcm_mmap(struct snd_pcm_substream *substream, + struct vm_area_struct *vma) +{ + struct snd_pcm_runtime *runtime = substream->runtime; + return dma_mmap_writecombine(substream->pcm->card->dev, vma, + runtime->dma_area, + runtime->dma_addr, + runtime->dma_bytes); +} + +struct snd_pcm_ops pxa2xx_pcm_ops = { + .open = pxa2xx_pcm_open, + .close = pxa2xx_pcm_close, + .ioctl = snd_pcm_lib_ioctl, + .hw_params = pxa2xx_pcm_hw_params, + .hw_free = pxa2xx_pcm_hw_free, + .prepare = pxa2xx_pcm_prepare, + .trigger = pxa2xx_pcm_trigger, + .pointer = pxa2xx_pcm_pointer, + .mmap = pxa2xx_pcm_mmap, +}; + +static int pxa2xx_pcm_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 = pxa2xx_pcm_hardware.buffer_bytes_max; + 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 pxa2xx_pcm_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_writecombine(pcm->card->dev, buf->bytes, + buf->area, buf->addr); + buf->area = NULL; + } +} + +static u64 pxa2xx_pcm_dmamask = DMA_32BIT_MASK; + +int pxa2xx_pcm_new(struct snd_card *card, struct snd_soc_codec_dai *dai, + struct snd_pcm *pcm) +{ + int ret = 0; + + if (!card->dev->dma_mask) + card->dev->dma_mask = &pxa2xx_pcm_dmamask; + if (!card->dev->coherent_dma_mask) + card->dev->coherent_dma_mask = DMA_32BIT_MASK; + + if (dai->playback.channels_min) { + ret = pxa2xx_pcm_preallocate_dma_buffer(pcm, + SNDRV_PCM_STREAM_PLAYBACK); + if (ret) + goto out; + } + + if (dai->capture.channels_min) { + ret = pxa2xx_pcm_preallocate_dma_buffer(pcm, + SNDRV_PCM_STREAM_CAPTURE); + if (ret) + goto out; + } + out: + return ret; +} + +struct snd_soc_platform pxa2xx_soc_platform = { + .name = "pxa2xx-audio", + .pcm_ops = &pxa2xx_pcm_ops, + .pcm_new = pxa2xx_pcm_new, + .pcm_free = pxa2xx_pcm_free_dma_buffers, +}; + +EXPORT_SYMBOL_GPL(pxa2xx_soc_platform); + +MODULE_AUTHOR("Nicolas Pitre"); +MODULE_DESCRIPTION("Intel PXA2xx PCM DMA module"); +MODULE_LICENSE("GPL"); diff --git a/sound/soc/pxa/pxa2xx-pcm.h b/sound/soc/pxa/pxa2xx-pcm.h new file mode 100644 index 00000000000..0b55f070da2 --- /dev/null +++ b/sound/soc/pxa/pxa2xx-pcm.h @@ -0,0 +1,48 @@ +/* + * linux/sound/arm/pxa2xx-pcm.h -- ALSA PCM interface for the Intel PXA2xx chip + * + * Author: Nicolas Pitre + * Created: Nov 30, 2004 + * Copyright: MontaVista Software, Inc. + * + * 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. + */ + +#ifndef _PXA2XX_PCM_H +#define _PXA2XX_PCM_H + +struct pxa2xx_pcm_dma_params { + char *name; /* stream identifier */ + u32 dcmd; /* DMA descriptor dcmd field */ + volatile u32 *drcmr; /* the DMA request channel to use */ + u32 dev_addr; /* device physical address for DMA */ +}; + +struct pxa2xx_gpio { + u32 sys; + u32 rx; + u32 tx; + u32 clk; + u32 frm; +}; + +/* pxa2xx DAI ID's */ +#define PXA2XX_DAI_AC97_HIFI 0 +#define PXA2XX_DAI_AC97_AUX 1 +#define PXA2XX_DAI_AC97_MIC 2 +#define PXA2XX_DAI_I2S 0 +#define PXA2XX_DAI_SSP1 0 +#define PXA2XX_DAI_SSP2 1 +#define PXA2XX_DAI_SSP3 2 + +extern struct snd_soc_cpu_dai pxa_ac97_dai[3]; +extern struct snd_soc_cpu_dai pxa_i2s_dai; +extern struct snd_soc_cpu_dai pxa_ssp_dai[3]; + +/* platform data */ +extern struct snd_soc_platform pxa2xx_soc_platform; +extern struct snd_ac97_bus_ops pxa2xx_ac97_ops; + +#endif |