sound/soc/imx/imx-pcm-fiq.c

   1 /*
   2  * imx-pcm-fiq.c  --  ALSA Soc Audio Layer
   3  *
   4  * Copyright 2009 Sascha Hauer <s.hauer@pengutronix.de>
   5  *
   6  * This code is based on code copyrighted by Freescale,
   7  * Liam Girdwood, Javier Martin and probably others.
   8  *
   9  *  This program is free software; you can redistribute  it and/or modify it
  10  *  under  the terms of  the GNU General  Public License as published by the
  11  *  Free Software Foundation;  either version 2 of the  License, or (at your
  12  *  option) any later version.
  13  */
  14 #include <linux/clk.h>
  15 #include <linux/delay.h>
  16 #include <linux/device.h>
  17 #include <linux/dma-mapping.h>
  18 #include <linux/init.h>
  19 #include <linux/interrupt.h>
  20 #include <linux/module.h>
  21 #include <linux/platform_device.h>
  22 #include <linux/slab.h>
  23
  24 #include <sound/core.h>
  25 #include <sound/initval.h>
  26 #include <sound/pcm.h>
  27 #include <sound/pcm_params.h>
  28 #include <sound/soc.h>
  29
  30 #include <asm/fiq.h>
  31
  32 #include <mach/ssi.h>
  33
  34 #include "imx-ssi.h"
  35
  36 struct imx_pcm_runtime_data {
  37         int period;
  38         int periods;
  39         unsigned long offset;
  40         unsigned long last_offset;
  41         unsigned long size;
  42         struct timer_list timer;
  43         int poll_time;
  44 };
  45
  46 static inline void imx_ssi_set_next_poll(struct imx_pcm_runtime_data *iprtd)
  47 {
  48         iprtd->timer.expires = jiffies + iprtd->poll_time;
  49 }
  50
  51 static void imx_ssi_timer_callback(unsigned long data)
  52 {
  53         struct snd_pcm_substream *substream = (void *)data;
  54         struct snd_pcm_runtime *runtime = substream->runtime;
  55         struct imx_pcm_runtime_data *iprtd = runtime->private_data;
  56         struct pt_regs regs;
  57         unsigned long delta;
  58
  59         get_fiq_regs(&regs);
  60
  61         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
  62                 iprtd->offset = regs.ARM_r8 & 0xffff;
  63         else
  64                 iprtd->offset = regs.ARM_r9 & 0xffff;
  65
  66         /* How much data have we transferred since the last period report? */
  67         if (iprtd->offset >= iprtd->last_offset)
  68                 delta = iprtd->offset - iprtd->last_offset;
  69         else
  70                 delta = runtime->buffer_size + iprtd->offset
  71                         - iprtd->last_offset;
  72
  73         /* If we've transferred at least a period then report it and
  74          * reset our poll time */
  75         if (delta >= runtime->period_size) {
  76                 snd_pcm_period_elapsed(substream);
  77                 iprtd->last_offset = iprtd->offset;
  78
  79                 imx_ssi_set_next_poll(iprtd);
  80         }
  81
  82         /* Restart the timer; if we didn't report we'll run on the next tick */
  83         add_timer(&iprtd->timer);
  84
  85 }
  86
  87 static struct fiq_handler fh = {
  88         .name           = DRV_NAME,
  89 };
  90
  91 static int snd_imx_pcm_hw_params(struct snd_pcm_substream *substream,
  92                                 struct snd_pcm_hw_params *params)
  93 {
  94         struct snd_pcm_runtime *runtime = substream->runtime;
  95         struct imx_pcm_runtime_data *iprtd = runtime->private_data;
  96
  97         iprtd->size = params_buffer_bytes(params);
  98         iprtd->periods = params_periods(params);
  99         iprtd->period = params_period_bytes(params) ;
 100         iprtd->offset = 0;
 101         iprtd->last_offset = 0;
 102         iprtd->poll_time = HZ / (params_rate(params) / params_period_size(params));
 103
 104         snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
 105
 106         return 0;
 107 }
 108
 109 static int snd_imx_pcm_prepare(struct snd_pcm_substream *substream)
 110 {
 111         struct snd_pcm_runtime *runtime = substream->runtime;
 112         struct imx_pcm_runtime_data *iprtd = runtime->private_data;
 113         struct pt_regs regs;
 114
 115         get_fiq_regs(&regs);
 116         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 117                 regs.ARM_r8 = (iprtd->period * iprtd->periods - 1) << 16;
 118         else
 119                 regs.ARM_r9 = (iprtd->period * iprtd->periods - 1) << 16;
 120
 121         set_fiq_regs(&regs);
 122
 123         return 0;
 124 }
 125
 126 static int fiq_enable;
 127 static int imx_pcm_fiq;
 128
 129 static int snd_imx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 130 {
 131         struct snd_pcm_runtime *runtime = substream->runtime;
 132         struct imx_pcm_runtime_data *iprtd = runtime->private_data;
 133
 134         switch (cmd) {
 135         case SNDRV_PCM_TRIGGER_START:
 136         case SNDRV_PCM_TRIGGER_RESUME:
 137         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 138                 imx_ssi_set_next_poll(iprtd);
 139                 add_timer(&iprtd->timer);
 140                 if (++fiq_enable == 1)
 141                         enable_fiq(imx_pcm_fiq);
 142
 143                 break;
 144
 145         case SNDRV_PCM_TRIGGER_STOP:
 146         case SNDRV_PCM_TRIGGER_SUSPEND:
 147         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 148                 del_timer(&iprtd->timer);
 149                 if (--fiq_enable == 0)
 150                         disable_fiq(imx_pcm_fiq);
 151
 152
 153                 break;
 154         default:
 155                 return -EINVAL;
 156         }
 157
 158         return 0;
 159 }
 160
 161 static snd_pcm_uframes_t snd_imx_pcm_pointer(struct snd_pcm_substream *substream)
 162 {
 163         struct snd_pcm_runtime *runtime = substream->runtime;
 164         struct imx_pcm_runtime_data *iprtd = runtime->private_data;
 165
 166         return bytes_to_frames(substream->runtime, iprtd->offset);
 167 }
 168
 169 static struct snd_pcm_hardware snd_imx_hardware = {
 170         .info = SNDRV_PCM_INFO_INTERLEAVED |
 171                 SNDRV_PCM_INFO_BLOCK_TRANSFER |
 172                 SNDRV_PCM_INFO_MMAP |
 173                 SNDRV_PCM_INFO_MMAP_VALID |
 174                 SNDRV_PCM_INFO_PAUSE |
 175                 SNDRV_PCM_INFO_RESUME,
 176         .formats = SNDRV_PCM_FMTBIT_S16_LE,
 177         .rate_min = 8000,
 178         .channels_min = 2,
 179         .channels_max = 2,
 180         .buffer_bytes_max = IMX_SSI_DMABUF_SIZE,
 181         .period_bytes_min = 128,
 182         .period_bytes_max = 16 * 1024,
 183         .periods_min = 2,
 184         .periods_max = 255,
 185         .fifo_size = 0,
 186 };
 187
 188 static int snd_imx_open(struct snd_pcm_substream *substream)
 189 {
 190         struct snd_pcm_runtime *runtime = substream->runtime;
 191         struct imx_pcm_runtime_data *iprtd;
 192         int ret;
 193
 194         iprtd = kzalloc(sizeof(*iprtd), GFP_KERNEL);
 195         runtime->private_data = iprtd;
 196
 197         init_timer(&iprtd->timer);
 198         iprtd->timer.data = (unsigned long)substream;
 199         iprtd->timer.function = imx_ssi_timer_callback;
 200
 201         ret = snd_pcm_hw_constraint_integer(substream->runtime,
 202                         SNDRV_PCM_HW_PARAM_PERIODS);
 203         if (ret < 0)
 204                 return ret;
 205
 206         snd_soc_set_runtime_hwparams(substream, &snd_imx_hardware);
 207         return 0;
 208 }
 209
 210 static int snd_imx_close(struct snd_pcm_substream *substream)
 211 {
 212         struct snd_pcm_runtime *runtime = substream->runtime;
 213         struct imx_pcm_runtime_data *iprtd = runtime->private_data;
 214
 215         del_timer_sync(&iprtd->timer);
 216         kfree(iprtd);
 217
 218         return 0;
 219 }
 220
 221 static struct snd_pcm_ops imx_pcm_ops = {
 222         .open           = snd_imx_open,
 223         .close          = snd_imx_close,
 224         .ioctl          = snd_pcm_lib_ioctl,
 225         .hw_params      = snd_imx_pcm_hw_params,
 226         .prepare        = snd_imx_pcm_prepare,
 227         .trigger        = snd_imx_pcm_trigger,
 228         .pointer        = snd_imx_pcm_pointer,
 229         .mmap           = snd_imx_pcm_mmap,
 230 };
 231
 232 static int imx_pcm_fiq_new(struct snd_card *card, struct snd_soc_dai *dai,
 233         struct snd_pcm *pcm)
 234 {
 235         int ret;
 236
 237         ret = imx_pcm_new(card, dai, pcm);
 238         if (ret)
 239                 return ret;
 240
 241         if (dai->playback.channels_min) {
 242                 struct snd_pcm_substream *substream =
 243                         pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream;
 244                 struct snd_dma_buffer *buf = &substream->dma_buffer;
 245
 246                 imx_ssi_fiq_tx_buffer = (unsigned long)buf->area;
 247         }
 248
 249         if (dai->capture.channels_min) {
 250                 struct snd_pcm_substream *substream =
 251                         pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream;
 252                 struct snd_dma_buffer *buf = &substream->dma_buffer;
 253
 254                 imx_ssi_fiq_rx_buffer = (unsigned long)buf->area;
 255         }
 256
 257         set_fiq_handler(&imx_ssi_fiq_start,
 258                 &imx_ssi_fiq_end - &imx_ssi_fiq_start);
 259
 260         return 0;
 261 }
 262
 263 static struct snd_soc_platform imx_soc_platform_fiq = {
 264         .pcm_ops        = &imx_pcm_ops,
 265         .pcm_new        = imx_pcm_fiq_new,
 266         .pcm_free       = imx_pcm_free,
 267 };
 268
 269 struct snd_soc_platform *imx_ssi_fiq_init(struct platform_device *pdev,
 270                 struct imx_ssi *ssi)
 271 {
 272         int ret = 0;
 273
 274         ret = claim_fiq(&fh);
 275         if (ret) {
 276                 dev_err(&pdev->dev, "failed to claim fiq: %d", ret);
 277                 return ERR_PTR(ret);
 278         }
 279
 280         mxc_set_irq_fiq(ssi->irq, 1);
 281
 282         imx_pcm_fiq = ssi->irq;
 283
 284         imx_ssi_fiq_base = (unsigned long)ssi->base;
 285
 286         ssi->dma_params_tx.burstsize = 4;
 287         ssi->dma_params_rx.burstsize = 6;
 288
 289         return &imx_soc_platform_fiq;
 290 }
 291
 292 void imx_ssi_fiq_exit(struct platform_device *pdev,
 293                 struct imx_ssi *ssi)
 294 {
 295         mxc_set_irq_fiq(ssi->irq, 0);
 296         release_fiq(&fh);
 297 }
 298