/* * 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");