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488 lines
12 KiB
C
488 lines
12 KiB
C
/*
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* mx1_mx2-pcm.c -- ALSA SoC interface for Freescale i.MX1x, i.MX2x CPUs
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*
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* Copyright 2009 Vista Silicon S.L.
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* Author: Javier Martin
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* javier.martin@vista-silicon.com
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*
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* Based on mxc-pcm.c by Liam Girdwood.
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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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*
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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/platform_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/core.h>
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#include <sound/pcm.h>
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#include <sound/pcm_params.h>
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#include <sound/soc.h>
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#include <asm/dma.h>
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#include <mach/hardware.h>
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#include <mach/dma-mx1-mx2.h>
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#include "mx1_mx2-pcm.h"
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static const struct snd_pcm_hardware mx1_mx2_pcm_hardware = {
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.info = (SNDRV_PCM_INFO_INTERLEAVED |
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SNDRV_PCM_INFO_BLOCK_TRANSFER |
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SNDRV_PCM_INFO_MMAP |
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SNDRV_PCM_INFO_MMAP_VALID),
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.formats = SNDRV_PCM_FMTBIT_S16_LE,
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.buffer_bytes_max = 32 * 1024,
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.period_bytes_min = 64,
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.period_bytes_max = 8 * 1024,
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.periods_min = 2,
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.periods_max = 255,
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.fifo_size = 0,
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};
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struct mx1_mx2_runtime_data {
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int dma_ch;
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int active;
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unsigned int period;
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unsigned int periods;
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int tx_spin;
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spinlock_t dma_lock;
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struct mx1_mx2_pcm_dma_params *dma_params;
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};
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/**
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* This function stops the current dma transfer for playback
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* and clears the dma pointers.
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*
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* @param substream pointer to the structure of the current stream.
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*
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*/
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static int audio_stop_dma(struct snd_pcm_substream *substream)
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{
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struct snd_pcm_runtime *runtime = substream->runtime;
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struct mx1_mx2_runtime_data *prtd = runtime->private_data;
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unsigned long flags;
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spin_lock_irqsave(&prtd->dma_lock, flags);
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pr_debug("%s\n", __func__);
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prtd->active = 0;
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prtd->period = 0;
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prtd->periods = 0;
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/* this stops the dma channel and clears the buffer ptrs */
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imx_dma_disable(prtd->dma_ch);
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spin_unlock_irqrestore(&prtd->dma_lock, flags);
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return 0;
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}
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/**
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* This function is called whenever a new audio block needs to be
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* transferred to the codec. The function receives the address and the size
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* of the new block and start a new DMA transfer.
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*
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* @param substream pointer to the structure of the current stream.
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*
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*/
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static int dma_new_period(struct snd_pcm_substream *substream)
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{
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struct snd_pcm_runtime *runtime = substream->runtime;
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struct mx1_mx2_runtime_data *prtd = runtime->private_data;
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unsigned int dma_size;
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unsigned int offset;
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int ret = 0;
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dma_addr_t mem_addr;
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unsigned int dev_addr;
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if (prtd->active) {
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dma_size = frames_to_bytes(runtime, runtime->period_size);
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offset = dma_size * prtd->period;
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pr_debug("%s: period (%d) out of (%d)\n", __func__,
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prtd->period,
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runtime->periods);
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pr_debug("period_size %d frames\n offset %d bytes\n",
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(unsigned int)runtime->period_size,
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offset);
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pr_debug("dma_size %d bytes\n", dma_size);
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snd_BUG_ON(dma_size > mx1_mx2_pcm_hardware.period_bytes_max);
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mem_addr = (dma_addr_t)(runtime->dma_addr + offset);
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dev_addr = prtd->dma_params->per_address;
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pr_debug("%s: mem_addr is %x\n dev_addr is %x\n",
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__func__, mem_addr, dev_addr);
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ret = imx_dma_setup_single(prtd->dma_ch, mem_addr,
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dma_size, dev_addr,
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prtd->dma_params->transfer_type);
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if (ret < 0) {
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printk(KERN_ERR "Error %d configuring DMA\n", ret);
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return ret;
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}
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imx_dma_enable(prtd->dma_ch);
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pr_debug("%s: transfer enabled\nmem_addr = %x\n",
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__func__, (unsigned int) mem_addr);
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pr_debug("dev_addr = %x\ndma_size = %d\n",
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(unsigned int) dev_addr, dma_size);
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prtd->tx_spin = 1; /* FGA little trick to retrieve DMA pos */
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prtd->period++;
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prtd->period %= runtime->periods;
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}
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return ret;
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}
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/**
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* This is a callback which will be called
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* when a TX transfer finishes. The call occurs
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* in interrupt context.
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*
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* @param dat pointer to the structure of the current stream.
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*
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*/
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static void audio_dma_irq(int channel, void *data)
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{
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struct snd_pcm_substream *substream;
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struct snd_pcm_runtime *runtime;
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struct mx1_mx2_runtime_data *prtd;
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unsigned int dma_size;
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unsigned int previous_period;
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unsigned int offset;
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substream = data;
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runtime = substream->runtime;
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prtd = runtime->private_data;
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previous_period = prtd->periods;
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dma_size = frames_to_bytes(runtime, runtime->period_size);
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offset = dma_size * previous_period;
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prtd->tx_spin = 0;
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prtd->periods++;
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prtd->periods %= runtime->periods;
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pr_debug("%s: irq per %d offset %x\n", __func__, prtd->periods, offset);
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/*
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* If we are getting a callback for an active stream then we inform
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* the PCM middle layer we've finished a period
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*/
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if (prtd->active)
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snd_pcm_period_elapsed(substream);
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/*
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* Trig next DMA transfer
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*/
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dma_new_period(substream);
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}
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/**
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* This function configures the hardware to allow audio
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* playback operations. It is called by ALSA framework.
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*
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* @param substream pointer to the structure of the current stream.
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*
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* @return 0 on success, -1 otherwise.
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*/
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static int
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snd_mx1_mx2_prepare(struct snd_pcm_substream *substream)
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{
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struct snd_pcm_runtime *runtime = substream->runtime;
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struct mx1_mx2_runtime_data *prtd = runtime->private_data;
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prtd->period = 0;
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prtd->periods = 0;
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return 0;
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}
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static int mx1_mx2_pcm_hw_params(struct snd_pcm_substream *substream,
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struct snd_pcm_hw_params *hw_params)
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{
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struct snd_pcm_runtime *runtime = substream->runtime;
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int ret;
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ret = snd_pcm_lib_malloc_pages(substream,
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params_buffer_bytes(hw_params));
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if (ret < 0) {
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printk(KERN_ERR "%s: Error %d failed to malloc pcm pages \n",
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__func__, ret);
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return ret;
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}
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pr_debug("%s: snd_imx1_mx2_audio_hw_params runtime->dma_addr 0x(%x)\n",
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__func__, (unsigned int)runtime->dma_addr);
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pr_debug("%s: snd_imx1_mx2_audio_hw_params runtime->dma_area 0x(%x)\n",
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__func__, (unsigned int)runtime->dma_area);
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pr_debug("%s: snd_imx1_mx2_audio_hw_params runtime->dma_bytes 0x(%x)\n",
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__func__, (unsigned int)runtime->dma_bytes);
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return ret;
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}
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static int mx1_mx2_pcm_hw_free(struct snd_pcm_substream *substream)
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{
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struct snd_pcm_runtime *runtime = substream->runtime;
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struct mx1_mx2_runtime_data *prtd = runtime->private_data;
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imx_dma_free(prtd->dma_ch);
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snd_pcm_lib_free_pages(substream);
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return 0;
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}
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static int mx1_mx2_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
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{
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struct mx1_mx2_runtime_data *prtd = 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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prtd->tx_spin = 0;
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/* requested stream startup */
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prtd->active = 1;
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pr_debug("%s: starting dma_new_period\n", __func__);
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ret = dma_new_period(substream);
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break;
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case SNDRV_PCM_TRIGGER_STOP:
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/* requested stream shutdown */
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pr_debug("%s: stopping dma transfer\n", __func__);
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ret = audio_stop_dma(substream);
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break;
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default:
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ret = -EINVAL;
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break;
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}
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return ret;
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}
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static snd_pcm_uframes_t
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mx1_mx2_pcm_pointer(struct snd_pcm_substream *substream)
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{
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struct snd_pcm_runtime *runtime = substream->runtime;
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struct mx1_mx2_runtime_data *prtd = runtime->private_data;
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unsigned int offset = 0;
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/* tx_spin value is used here to check if a transfer is active */
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if (prtd->tx_spin) {
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offset = (runtime->period_size * (prtd->periods)) +
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(runtime->period_size >> 1);
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if (offset >= runtime->buffer_size)
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offset = runtime->period_size >> 1;
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} else {
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offset = (runtime->period_size * (prtd->periods));
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if (offset >= runtime->buffer_size)
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offset = 0;
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}
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pr_debug("%s: pointer offset %x\n", __func__, offset);
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return offset;
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}
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static int mx1_mx2_pcm_open(struct snd_pcm_substream *substream)
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{
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struct snd_pcm_runtime *runtime = substream->runtime;
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struct mx1_mx2_runtime_data *prtd;
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struct snd_soc_pcm_runtime *rtd = substream->private_data;
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struct mx1_mx2_pcm_dma_params *dma_data = rtd->dai->cpu_dai->dma_data;
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int ret;
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snd_soc_set_runtime_hwparams(substream, &mx1_mx2_pcm_hardware);
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ret = snd_pcm_hw_constraint_integer(runtime,
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SNDRV_PCM_HW_PARAM_PERIODS);
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if (ret < 0)
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return ret;
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prtd = kzalloc(sizeof(struct mx1_mx2_runtime_data), GFP_KERNEL);
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if (prtd == NULL) {
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ret = -ENOMEM;
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goto out;
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}
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runtime->private_data = prtd;
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if (!dma_data)
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return -ENODEV;
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prtd->dma_params = dma_data;
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pr_debug("%s: Requesting dma channel (%s)\n", __func__,
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prtd->dma_params->name);
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prtd->dma_ch = imx_dma_request_by_prio(prtd->dma_params->name,
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DMA_PRIO_HIGH);
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if (prtd->dma_ch < 0) {
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printk(KERN_ERR "Error %d requesting dma channel\n", ret);
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return ret;
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}
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imx_dma_config_burstlen(prtd->dma_ch,
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prtd->dma_params->watermark_level);
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ret = imx_dma_config_channel(prtd->dma_ch,
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prtd->dma_params->per_config,
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prtd->dma_params->mem_config,
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prtd->dma_params->event_id, 0);
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if (ret) {
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pr_debug(KERN_ERR "Error %d configuring dma channel %d\n",
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ret, prtd->dma_ch);
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return ret;
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}
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pr_debug("%s: Setting tx dma callback function\n", __func__);
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ret = imx_dma_setup_handlers(prtd->dma_ch,
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audio_dma_irq, NULL,
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(void *)substream);
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if (ret < 0) {
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printk(KERN_ERR "Error %d setting dma callback function\n", ret);
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return ret;
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}
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return 0;
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out:
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return ret;
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}
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static int mx1_mx2_pcm_close(struct snd_pcm_substream *substream)
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{
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struct snd_pcm_runtime *runtime = substream->runtime;
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struct mx1_mx2_runtime_data *prtd = runtime->private_data;
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kfree(prtd);
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return 0;
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}
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static int mx1_mx2_pcm_mmap(struct snd_pcm_substream *substream,
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struct vm_area_struct *vma)
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{
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struct snd_pcm_runtime *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 struct snd_pcm_ops mx1_mx2_pcm_ops = {
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.open = mx1_mx2_pcm_open,
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.close = mx1_mx2_pcm_close,
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.ioctl = snd_pcm_lib_ioctl,
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.hw_params = mx1_mx2_pcm_hw_params,
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.hw_free = mx1_mx2_pcm_hw_free,
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.prepare = snd_mx1_mx2_prepare,
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.trigger = mx1_mx2_pcm_trigger,
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.pointer = mx1_mx2_pcm_pointer,
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.mmap = mx1_mx2_pcm_mmap,
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};
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static u64 mx1_mx2_pcm_dmamask = 0xffffffff;
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static int mx1_mx2_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
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{
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struct snd_pcm_substream *substream = pcm->streams[stream].substream;
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struct snd_dma_buffer *buf = &substream->dma_buffer;
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size_t size = mx1_mx2_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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/* Reserve uncached-buffered memory area for DMA */
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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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pr_debug("%s: preallocate_dma_buffer: area=%p, addr=%p, size=%d\n",
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__func__, (void *) buf->area, (void *) buf->addr, size);
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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 mx1_mx2_pcm_free_dma_buffers(struct snd_pcm *pcm)
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{
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struct snd_pcm_substream *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 int mx1_mx2_pcm_new(struct snd_card *card, struct snd_soc_dai *dai,
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struct snd_pcm *pcm)
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{
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int ret = 0;
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if (!card->dev->dma_mask)
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card->dev->dma_mask = &mx1_mx2_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 (dai->playback.channels_min) {
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ret = mx1_mx2_pcm_preallocate_dma_buffer(pcm,
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SNDRV_PCM_STREAM_PLAYBACK);
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pr_debug("%s: preallocate playback buffer\n", __func__);
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if (ret)
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goto out;
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}
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if (dai->capture.channels_min) {
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ret = mx1_mx2_pcm_preallocate_dma_buffer(pcm,
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SNDRV_PCM_STREAM_CAPTURE);
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pr_debug("%s: preallocate capture buffer\n", __func__);
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if (ret)
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goto out;
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}
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out:
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return ret;
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}
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struct snd_soc_platform mx1_mx2_soc_platform = {
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.name = "mx1_mx2-audio",
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.pcm_ops = &mx1_mx2_pcm_ops,
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.pcm_new = mx1_mx2_pcm_new,
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.pcm_free = mx1_mx2_pcm_free_dma_buffers,
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};
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EXPORT_SYMBOL_GPL(mx1_mx2_soc_platform);
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static int __init mx1_mx2_soc_platform_init(void)
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{
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return snd_soc_register_platform(&mx1_mx2_soc_platform);
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}
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module_init(mx1_mx2_soc_platform_init);
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static void __exit mx1_mx2_soc_platform_exit(void)
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{
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snd_soc_unregister_platform(&mx1_mx2_soc_platform);
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}
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module_exit(mx1_mx2_soc_platform_exit);
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MODULE_AUTHOR("Javier Martin, javier.martin@vista-silicon.com");
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MODULE_DESCRIPTION("Freescale i.MX2x, i.MX1x PCM DMA module");
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MODULE_LICENSE("GPL");
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