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368 lines
9.3 KiB
C
368 lines
9.3 KiB
C
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/*
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* linux/sound/arm/pxa2xx-pcm.c -- ALSA PCM interface for the Intel PXA2xx chip
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*
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* Author: Nicolas Pitre
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* Created: Nov 30, 2004
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* Copyright: (C) 2004 MontaVista Software, Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/device.h>
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#include <linux/slab.h>
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#include <linux/dma-mapping.h>
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#include <sound/driver.h>
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#include <sound/core.h>
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#include <sound/pcm.h>
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#include <sound/pcm_params.h>
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#include <asm/dma.h>
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#include <asm/hardware.h>
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#include <asm/arch/pxa-regs.h>
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#include "pxa2xx-pcm.h"
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static const snd_pcm_hardware_t pxa2xx_pcm_hardware = {
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.info = SNDRV_PCM_INFO_MMAP |
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SNDRV_PCM_INFO_MMAP_VALID |
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SNDRV_PCM_INFO_INTERLEAVED |
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SNDRV_PCM_INFO_PAUSE,
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.formats = SNDRV_PCM_FMTBIT_S16_LE,
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.period_bytes_min = 32,
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.period_bytes_max = 8192 - 32,
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.periods_min = 1,
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.periods_max = PAGE_SIZE/sizeof(pxa_dma_desc),
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.buffer_bytes_max = 128 * 1024,
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.fifo_size = 32,
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};
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struct pxa2xx_runtime_data {
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int dma_ch;
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pxa2xx_pcm_dma_params_t *params;
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pxa_dma_desc *dma_desc_array;
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dma_addr_t dma_desc_array_phys;
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};
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static int pxa2xx_pcm_hw_params(snd_pcm_substream_t *substream,
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snd_pcm_hw_params_t *params)
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{
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snd_pcm_runtime_t *runtime = substream->runtime;
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struct pxa2xx_runtime_data *rtd = runtime->private_data;
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size_t totsize = params_buffer_bytes(params);
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size_t period = params_period_bytes(params);
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pxa_dma_desc *dma_desc;
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dma_addr_t dma_buff_phys, next_desc_phys;
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snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
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runtime->dma_bytes = totsize;
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dma_desc = rtd->dma_desc_array;
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next_desc_phys = rtd->dma_desc_array_phys;
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dma_buff_phys = runtime->dma_addr;
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do {
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next_desc_phys += sizeof(pxa_dma_desc);
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dma_desc->ddadr = next_desc_phys;
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if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
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dma_desc->dsadr = dma_buff_phys;
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dma_desc->dtadr = rtd->params->dev_addr;
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} else {
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dma_desc->dsadr = rtd->params->dev_addr;
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dma_desc->dtadr = dma_buff_phys;
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}
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if (period > totsize)
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period = totsize;
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dma_desc->dcmd = rtd->params->dcmd | period | DCMD_ENDIRQEN;
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dma_desc++;
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dma_buff_phys += period;
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} while (totsize -= period);
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dma_desc[-1].ddadr = rtd->dma_desc_array_phys;
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return 0;
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}
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static int pxa2xx_pcm_hw_free(snd_pcm_substream_t *substream)
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{
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struct pxa2xx_runtime_data *rtd = substream->runtime->private_data;
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*rtd->params->drcmr = 0;
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snd_pcm_set_runtime_buffer(substream, NULL);
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return 0;
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}
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static int pxa2xx_pcm_prepare(snd_pcm_substream_t *substream)
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{
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pxa2xx_pcm_client_t *client = substream->private_data;
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snd_pcm_runtime_t *runtime = substream->runtime;
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struct pxa2xx_runtime_data *rtd = runtime->private_data;
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DCSR(rtd->dma_ch) &= ~DCSR_RUN;
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DCSR(rtd->dma_ch) = 0;
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DCMD(rtd->dma_ch) = 0;
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*rtd->params->drcmr = rtd->dma_ch | DRCMR_MAPVLD;
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return client->prepare(substream);
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}
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static int pxa2xx_pcm_trigger(snd_pcm_substream_t *substream, int cmd)
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{
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struct pxa2xx_runtime_data *rtd = substream->runtime->private_data;
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int ret = 0;
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switch (cmd) {
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case SNDRV_PCM_TRIGGER_START:
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DDADR(rtd->dma_ch) = rtd->dma_desc_array_phys;
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DCSR(rtd->dma_ch) = DCSR_RUN;
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break;
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case SNDRV_PCM_TRIGGER_STOP:
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case SNDRV_PCM_TRIGGER_SUSPEND:
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case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
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DCSR(rtd->dma_ch) &= ~DCSR_RUN;
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break;
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case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
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DCSR(rtd->dma_ch) |= DCSR_RUN;
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break;
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default:
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ret = -EINVAL;
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}
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return ret;
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}
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static void pxa2xx_pcm_dma_irq(int dma_ch, void *dev_id, struct pt_regs *regs)
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{
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snd_pcm_substream_t *substream = dev_id;
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struct pxa2xx_runtime_data *rtd = substream->runtime->private_data;
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int dcsr;
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dcsr = DCSR(dma_ch);
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DCSR(dma_ch) = dcsr & ~DCSR_STOPIRQEN;
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if (dcsr & DCSR_ENDINTR) {
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snd_pcm_period_elapsed(substream);
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} else {
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printk( KERN_ERR "%s: DMA error on channel %d (DCSR=%#x)\n",
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rtd->params->name, dma_ch, dcsr );
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snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
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}
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}
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static snd_pcm_uframes_t pxa2xx_pcm_pointer(snd_pcm_substream_t *substream)
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{
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snd_pcm_runtime_t *runtime = substream->runtime;
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struct pxa2xx_runtime_data *rtd = runtime->private_data;
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dma_addr_t ptr = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
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DSADR(rtd->dma_ch) : DTADR(rtd->dma_ch);
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snd_pcm_uframes_t x = bytes_to_frames(runtime, ptr - runtime->dma_addr);
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if (x == runtime->buffer_size)
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x = 0;
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return x;
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}
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static int
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pxa2xx_pcm_hw_rule_mult32(snd_pcm_hw_params_t *params, snd_pcm_hw_rule_t *rule)
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{
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snd_interval_t *i = hw_param_interval(params, rule->var);
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int changed = 0;
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if (i->min & 31) {
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i->min = (i->min & ~31) + 32;
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i->openmin = 0;
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changed = 1;
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}
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if (i->max & 31) {
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i->max &= ~31;
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i->openmax = 0;
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changed = 1;
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}
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return changed;
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}
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static int pxa2xx_pcm_open(snd_pcm_substream_t *substream)
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{
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pxa2xx_pcm_client_t *client = substream->private_data;
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snd_pcm_runtime_t *runtime = substream->runtime;
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struct pxa2xx_runtime_data *rtd;
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int ret;
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runtime->hw = pxa2xx_pcm_hardware;
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/*
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* For mysterious reasons (and despite what the manual says)
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* playback samples are lost if the DMA count is not a multiple
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* of the DMA burst size. Let's add a rule to enforce that.
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*/
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ret = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
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pxa2xx_pcm_hw_rule_mult32, NULL,
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SNDRV_PCM_HW_PARAM_PERIOD_BYTES, -1);
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if (ret)
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goto out;
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ret = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
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pxa2xx_pcm_hw_rule_mult32, NULL,
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SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1);
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if (ret)
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goto out;
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ret = -ENOMEM;
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rtd = kmalloc(sizeof(*rtd), GFP_KERNEL);
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if (!rtd)
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goto out;
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rtd->dma_desc_array =
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dma_alloc_writecombine(substream->pcm->card->dev, PAGE_SIZE,
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&rtd->dma_desc_array_phys, GFP_KERNEL);
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if (!rtd->dma_desc_array)
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goto err1;
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rtd->params = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
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client->playback_params : client->capture_params;
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ret = pxa_request_dma(rtd->params->name, DMA_PRIO_LOW,
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pxa2xx_pcm_dma_irq, substream);
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if (ret < 0)
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goto err2;
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rtd->dma_ch = ret;
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runtime->private_data = rtd;
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ret = client->startup(substream);
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if (!ret)
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goto out;
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pxa_free_dma(rtd->dma_ch);
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err2:
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dma_free_writecombine(substream->pcm->card->dev, PAGE_SIZE,
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rtd->dma_desc_array, rtd->dma_desc_array_phys);
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err1:
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kfree(rtd);
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out:
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return ret;
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}
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static int pxa2xx_pcm_close(snd_pcm_substream_t *substream)
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{
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pxa2xx_pcm_client_t *client = substream->private_data;
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struct pxa2xx_runtime_data *rtd = substream->runtime->private_data;
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pxa_free_dma(rtd->dma_ch);
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client->shutdown(substream);
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dma_free_writecombine(substream->pcm->card->dev, PAGE_SIZE,
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rtd->dma_desc_array, rtd->dma_desc_array_phys);
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kfree(rtd);
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return 0;
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}
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static int
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pxa2xx_pcm_mmap(snd_pcm_substream_t *substream, struct vm_area_struct *vma)
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{
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snd_pcm_runtime_t *runtime = substream->runtime;
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return dma_mmap_writecombine(substream->pcm->card->dev, vma,
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runtime->dma_area,
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runtime->dma_addr,
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runtime->dma_bytes);
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}
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static snd_pcm_ops_t pxa2xx_pcm_ops = {
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.open = pxa2xx_pcm_open,
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.close = pxa2xx_pcm_close,
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.ioctl = snd_pcm_lib_ioctl,
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.hw_params = pxa2xx_pcm_hw_params,
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.hw_free = pxa2xx_pcm_hw_free,
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.prepare = pxa2xx_pcm_prepare,
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.trigger = pxa2xx_pcm_trigger,
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.pointer = pxa2xx_pcm_pointer,
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.mmap = pxa2xx_pcm_mmap,
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};
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static int pxa2xx_pcm_preallocate_dma_buffer(snd_pcm_t *pcm, int stream)
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{
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snd_pcm_substream_t *substream = pcm->streams[stream].substream;
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struct snd_dma_buffer *buf = &substream->dma_buffer;
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size_t size = pxa2xx_pcm_hardware.buffer_bytes_max;
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buf->dev.type = SNDRV_DMA_TYPE_DEV;
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buf->dev.dev = pcm->card->dev;
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buf->private_data = NULL;
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buf->area = dma_alloc_writecombine(pcm->card->dev, size,
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&buf->addr, GFP_KERNEL);
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if (!buf->area)
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return -ENOMEM;
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buf->bytes = size;
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return 0;
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}
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static void pxa2xx_pcm_free_dma_buffers(snd_pcm_t *pcm)
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{
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snd_pcm_substream_t *substream;
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struct snd_dma_buffer *buf;
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int stream;
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for (stream = 0; stream < 2; stream++) {
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substream = pcm->streams[stream].substream;
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if (!substream)
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continue;
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buf = &substream->dma_buffer;
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if (!buf->area)
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continue;
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dma_free_writecombine(pcm->card->dev, buf->bytes,
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buf->area, buf->addr);
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buf->area = NULL;
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}
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}
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static u64 pxa2xx_pcm_dmamask = 0xffffffff;
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int pxa2xx_pcm_new(snd_card_t *card, pxa2xx_pcm_client_t *client, snd_pcm_t **rpcm)
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{
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snd_pcm_t *pcm;
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int play = client->playback_params ? 1 : 0;
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int capt = client->capture_params ? 1 : 0;
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int ret;
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ret = snd_pcm_new(card, "PXA2xx-PCM", 0, play, capt, &pcm);
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if (ret)
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goto out;
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pcm->private_data = client;
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pcm->private_free = pxa2xx_pcm_free_dma_buffers;
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if (!card->dev->dma_mask)
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card->dev->dma_mask = &pxa2xx_pcm_dmamask;
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if (!card->dev->coherent_dma_mask)
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card->dev->coherent_dma_mask = 0xffffffff;
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if (play) {
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int stream = SNDRV_PCM_STREAM_PLAYBACK;
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snd_pcm_set_ops(pcm, stream, &pxa2xx_pcm_ops);
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ret = pxa2xx_pcm_preallocate_dma_buffer(pcm, stream);
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if (ret)
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goto out;
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}
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if (capt) {
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int stream = SNDRV_PCM_STREAM_CAPTURE;
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snd_pcm_set_ops(pcm, stream, &pxa2xx_pcm_ops);
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ret = pxa2xx_pcm_preallocate_dma_buffer(pcm, stream);
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if (ret)
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goto out;
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}
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if (rpcm)
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*rpcm = pcm;
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ret = 0;
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out:
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return ret;
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}
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EXPORT_SYMBOL(pxa2xx_pcm_new);
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MODULE_AUTHOR("Nicolas Pitre");
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MODULE_DESCRIPTION("Intel PXA2xx PCM DMA module");
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MODULE_LICENSE("GPL");
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