394 строки
9.3 KiB
C
394 строки
9.3 KiB
C
/*
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* imx-pcm-fiq.c -- ALSA Soc Audio Layer
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*
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* Copyright 2009 Sascha Hauer <s.hauer@pengutronix.de>
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*
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* This code is based on code copyrighted by Freescale,
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* Liam Girdwood, Javier Martin and probably others.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*/
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#include <linux/clk.h>
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#include <linux/delay.h>
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#include <linux/device.h>
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#include <linux/dma-mapping.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <sound/core.h>
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#include <sound/dmaengine_pcm.h>
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#include <sound/initval.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/fiq.h>
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#include <linux/platform_data/asoc-imx-ssi.h>
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#include "imx-ssi.h"
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#include "imx-pcm.h"
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struct imx_pcm_runtime_data {
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unsigned int period;
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int periods;
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unsigned long offset;
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struct hrtimer hrt;
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int poll_time_ns;
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struct snd_pcm_substream *substream;
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atomic_t playing;
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atomic_t capturing;
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};
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static enum hrtimer_restart snd_hrtimer_callback(struct hrtimer *hrt)
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{
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struct imx_pcm_runtime_data *iprtd =
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container_of(hrt, struct imx_pcm_runtime_data, hrt);
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struct snd_pcm_substream *substream = iprtd->substream;
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struct pt_regs regs;
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if (!atomic_read(&iprtd->playing) && !atomic_read(&iprtd->capturing))
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return HRTIMER_NORESTART;
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get_fiq_regs(®s);
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if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
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iprtd->offset = regs.ARM_r8 & 0xffff;
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else
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iprtd->offset = regs.ARM_r9 & 0xffff;
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snd_pcm_period_elapsed(substream);
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hrtimer_forward_now(hrt, ns_to_ktime(iprtd->poll_time_ns));
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return HRTIMER_RESTART;
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}
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static struct fiq_handler fh = {
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.name = DRV_NAME,
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};
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static int snd_imx_pcm_hw_params(struct snd_pcm_substream *substream,
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struct snd_pcm_hw_params *params)
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{
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struct snd_pcm_runtime *runtime = substream->runtime;
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struct imx_pcm_runtime_data *iprtd = runtime->private_data;
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iprtd->periods = params_periods(params);
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iprtd->period = params_period_bytes(params);
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iprtd->offset = 0;
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iprtd->poll_time_ns = 1000000000 / params_rate(params) *
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params_period_size(params);
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snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
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return 0;
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}
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static int snd_imx_pcm_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 imx_pcm_runtime_data *iprtd = runtime->private_data;
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struct pt_regs regs;
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get_fiq_regs(®s);
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if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
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regs.ARM_r8 = (iprtd->period * iprtd->periods - 1) << 16;
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else
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regs.ARM_r9 = (iprtd->period * iprtd->periods - 1) << 16;
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set_fiq_regs(®s);
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return 0;
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}
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static int imx_pcm_fiq;
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static int snd_imx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
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{
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struct snd_pcm_runtime *runtime = substream->runtime;
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struct imx_pcm_runtime_data *iprtd = runtime->private_data;
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switch (cmd) {
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case SNDRV_PCM_TRIGGER_START:
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case SNDRV_PCM_TRIGGER_RESUME:
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case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
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if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
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atomic_set(&iprtd->playing, 1);
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else
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atomic_set(&iprtd->capturing, 1);
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hrtimer_start(&iprtd->hrt, ns_to_ktime(iprtd->poll_time_ns),
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HRTIMER_MODE_REL);
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enable_fiq(imx_pcm_fiq);
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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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if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
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atomic_set(&iprtd->playing, 0);
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else
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atomic_set(&iprtd->capturing, 0);
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if (!atomic_read(&iprtd->playing) &&
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!atomic_read(&iprtd->capturing))
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disable_fiq(imx_pcm_fiq);
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break;
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default:
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return -EINVAL;
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}
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return 0;
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}
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static snd_pcm_uframes_t snd_imx_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 imx_pcm_runtime_data *iprtd = runtime->private_data;
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return bytes_to_frames(substream->runtime, iprtd->offset);
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}
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static struct snd_pcm_hardware snd_imx_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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SNDRV_PCM_INFO_PAUSE |
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SNDRV_PCM_INFO_RESUME,
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.formats = SNDRV_PCM_FMTBIT_S16_LE,
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.buffer_bytes_max = IMX_SSI_DMABUF_SIZE,
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.period_bytes_min = 128,
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.period_bytes_max = 16 * 1024,
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.periods_min = 4,
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.periods_max = 255,
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.fifo_size = 0,
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};
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static int snd_imx_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 imx_pcm_runtime_data *iprtd;
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int ret;
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iprtd = kzalloc(sizeof(*iprtd), GFP_KERNEL);
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if (iprtd == NULL)
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return -ENOMEM;
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runtime->private_data = iprtd;
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iprtd->substream = substream;
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atomic_set(&iprtd->playing, 0);
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atomic_set(&iprtd->capturing, 0);
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hrtimer_init(&iprtd->hrt, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
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iprtd->hrt.function = snd_hrtimer_callback;
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ret = snd_pcm_hw_constraint_integer(substream->runtime,
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SNDRV_PCM_HW_PARAM_PERIODS);
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if (ret < 0) {
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kfree(iprtd);
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return ret;
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}
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snd_soc_set_runtime_hwparams(substream, &snd_imx_hardware);
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return 0;
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}
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static int snd_imx_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 imx_pcm_runtime_data *iprtd = runtime->private_data;
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hrtimer_cancel(&iprtd->hrt);
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kfree(iprtd);
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return 0;
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}
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static int snd_imx_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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int ret;
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ret = dma_mmap_writecombine(substream->pcm->card->dev, vma,
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runtime->dma_area, runtime->dma_addr, runtime->dma_bytes);
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pr_debug("%s: ret: %d %p 0x%08x 0x%08x\n", __func__, ret,
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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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return ret;
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}
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static struct snd_pcm_ops imx_pcm_ops = {
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.open = snd_imx_open,
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.close = snd_imx_close,
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.ioctl = snd_pcm_lib_ioctl,
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.hw_params = snd_imx_pcm_hw_params,
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.prepare = snd_imx_pcm_prepare,
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.trigger = snd_imx_pcm_trigger,
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.pointer = snd_imx_pcm_pointer,
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.mmap = snd_imx_pcm_mmap,
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};
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static int imx_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 = IMX_SSI_DMABUF_SIZE;
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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 int imx_pcm_new(struct snd_soc_pcm_runtime *rtd)
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{
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struct snd_card *card = rtd->card->snd_card;
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struct snd_pcm *pcm = rtd->pcm;
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int ret;
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ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
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if (ret)
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return ret;
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if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
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ret = imx_pcm_preallocate_dma_buffer(pcm,
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SNDRV_PCM_STREAM_PLAYBACK);
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if (ret)
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return ret;
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}
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if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
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ret = imx_pcm_preallocate_dma_buffer(pcm,
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SNDRV_PCM_STREAM_CAPTURE);
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if (ret)
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return ret;
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}
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return 0;
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}
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static int ssi_irq = 0;
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static int imx_pcm_fiq_new(struct snd_soc_pcm_runtime *rtd)
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{
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struct snd_pcm *pcm = rtd->pcm;
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struct snd_pcm_substream *substream;
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int ret;
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ret = imx_pcm_new(rtd);
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if (ret)
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return ret;
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substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream;
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if (substream) {
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struct snd_dma_buffer *buf = &substream->dma_buffer;
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imx_ssi_fiq_tx_buffer = (unsigned long)buf->area;
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}
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substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream;
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if (substream) {
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struct snd_dma_buffer *buf = &substream->dma_buffer;
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imx_ssi_fiq_rx_buffer = (unsigned long)buf->area;
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}
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set_fiq_handler(&imx_ssi_fiq_start,
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&imx_ssi_fiq_end - &imx_ssi_fiq_start);
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return 0;
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}
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static void imx_pcm_free(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 void imx_pcm_fiq_free(struct snd_pcm *pcm)
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{
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mxc_set_irq_fiq(ssi_irq, 0);
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release_fiq(&fh);
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imx_pcm_free(pcm);
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}
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static struct snd_soc_platform_driver imx_soc_platform_fiq = {
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.ops = &imx_pcm_ops,
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.pcm_new = imx_pcm_fiq_new,
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.pcm_free = imx_pcm_fiq_free,
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};
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int imx_pcm_fiq_init(struct platform_device *pdev,
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struct imx_pcm_fiq_params *params)
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{
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int ret;
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ret = claim_fiq(&fh);
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if (ret) {
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dev_err(&pdev->dev, "failed to claim fiq: %d", ret);
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return ret;
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}
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mxc_set_irq_fiq(params->irq, 1);
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ssi_irq = params->irq;
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imx_pcm_fiq = params->irq;
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imx_ssi_fiq_base = (unsigned long)params->base;
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params->dma_params_tx->maxburst = 4;
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params->dma_params_rx->maxburst = 6;
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ret = snd_soc_register_platform(&pdev->dev, &imx_soc_platform_fiq);
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if (ret)
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goto failed_register;
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return 0;
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failed_register:
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mxc_set_irq_fiq(ssi_irq, 0);
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release_fiq(&fh);
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return ret;
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}
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EXPORT_SYMBOL_GPL(imx_pcm_fiq_init);
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void imx_pcm_fiq_exit(struct platform_device *pdev)
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{
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snd_soc_unregister_platform(&pdev->dev);
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}
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EXPORT_SYMBOL_GPL(imx_pcm_fiq_exit);
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MODULE_LICENSE("GPL");
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