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- /*
- * 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->dai->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;
- /* 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 */
- 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;
- ret = snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
- if (ret < 0)
- 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");
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