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/*
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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 <sound/core.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 <mach/ssi.h>
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#include "imx-ssi.h"
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struct imx_pcm_runtime_data {
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int period;
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int periods;
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unsigned long offset;
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unsigned long last_offset;
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unsigned long size;
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struct timer_list timer;
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int poll_time;
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};
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static inline void imx_ssi_set_next_poll(struct imx_pcm_runtime_data *iprtd)
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{
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iprtd->timer.expires = jiffies + iprtd->poll_time;
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}
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static void imx_ssi_timer_callback(unsigned long data)
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{
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struct snd_pcm_substream *substream = (void *)data;
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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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unsigned long delta;
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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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/* How much data have we transferred since the last period report? */
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if (iprtd->offset >= iprtd->last_offset)
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delta = iprtd->offset - iprtd->last_offset;
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else
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delta = runtime->buffer_size + iprtd->offset
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- iprtd->last_offset;
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/* If we've transferred at least a period then report it and
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* reset our poll time */
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if (delta >= runtime->period_size) {
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snd_pcm_period_elapsed(substream);
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iprtd->last_offset = iprtd->offset;
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imx_ssi_set_next_poll(iprtd);
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}
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/* Restart the timer; if we didn't report we'll run on the next tick */
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add_timer(&iprtd->timer);
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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->size = params_buffer_bytes(params);
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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->last_offset = 0;
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iprtd->poll_time = HZ / (params_rate(params) / 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 fiq_enable;
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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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imx_ssi_set_next_poll(iprtd);
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add_timer(&iprtd->timer);
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if (++fiq_enable == 1)
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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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del_timer(&iprtd->timer);
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if (--fiq_enable == 0)
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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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.rate_min = 8000,
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.channels_min = 2,
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.channels_max = 2,
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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 = 2,
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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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runtime->private_data = iprtd;
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init_timer(&iprtd->timer);
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iprtd->timer.data = (unsigned long)substream;
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iprtd->timer.function = imx_ssi_timer_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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return ret;
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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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del_timer_sync(&iprtd->timer);
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kfree(iprtd);
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return 0;
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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_fiq_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;
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ret = imx_pcm_new(card, dai, pcm);
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if (ret)
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return ret;
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if (dai->playback.channels_min) {
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struct snd_pcm_substream *substream =
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pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].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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if (dai->capture.channels_min) {
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struct snd_pcm_substream *substream =
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pcm->streams[SNDRV_PCM_STREAM_CAPTURE].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 struct snd_soc_platform imx_soc_platform_fiq = {
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.pcm_ops = &imx_pcm_ops,
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.pcm_new = imx_pcm_fiq_new,
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.pcm_free = imx_pcm_free,
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};
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struct snd_soc_platform *imx_ssi_fiq_init(struct platform_device *pdev,
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struct imx_ssi *ssi)
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{
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int ret = 0;
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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 ERR_PTR(ret);
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}
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mxc_set_irq_fiq(ssi->irq, 1);
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imx_pcm_fiq = ssi->irq;
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imx_ssi_fiq_base = (unsigned long)ssi->base;
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ssi->dma_params_tx.burstsize = 4;
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ssi->dma_params_rx.burstsize = 6;
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return &imx_soc_platform_fiq;
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}
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void imx_ssi_fiq_exit(struct platform_device *pdev,
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struct imx_ssi *ssi)
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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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}
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