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