| /* |
| * 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/core.h> |
| #include <sound/pcm.h> |
| #include <sound/pcm_params.h> |
| #include <sound/soc.h> |
| |
| #include <asm/dma.h> |
| #include <mach/hardware.h> |
| #include <mach/pxa-regs.h> |
| #include <mach/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_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"); |