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 dma_addr;
  39         int dma;
  40         unsigned long offset;
  41         unsigned long size;
  42         unsigned long period_cnt;
  43         void *buf;
  44         struct timer_list timer;
  45         int period_time;
  46 };
  47
  48 static void imx_ssi_timer_callback(unsigned long data)
  49 {
  50         struct snd_pcm_substream *substream = (void *)data;
  51         struct snd_pcm_runtime *runtime = substream->runtime;
  52         struct imx_pcm_runtime_data *iprtd = runtime->private_data;
  53         struct pt_regs regs;
  54
  55         get_fiq_regs(&regs);
  56
  57         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
  58                 iprtd->offset = regs.ARM_r8 & 0xffff;
  59         else
  60                 iprtd->offset = regs.ARM_r9 & 0xffff;
  61
  62         iprtd->timer.expires = jiffies + iprtd->period_time;
  63         add_timer(&iprtd->timer);
  64         snd_pcm_period_elapsed(substream);
  65 }
  66
  67 static struct fiq_handler fh = {
  68         .name           = DRV_NAME,
  69 };
  70
  71 static int snd_imx_pcm_hw_params(struct snd_pcm_substream *substream,
  72                                 struct snd_pcm_hw_params *params)
  73 {
  74         struct snd_pcm_runtime *runtime = substream->runtime;
  75         struct imx_pcm_runtime_data *iprtd = runtime->private_data;
  76
  77         iprtd->size = params_buffer_bytes(params);
  78         iprtd->periods = params_periods(params);
  79         iprtd->period = params_period_bytes(params);
  80         iprtd->offset = 0;
  81         iprtd->period_time = HZ / (params_rate(params) / params_period_size(params));
  82
  83         snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
  84
  85         return 0;
  86 }
  87
  88 static int snd_imx_pcm_prepare(struct snd_pcm_substream *substream)
  89 {
  90         struct snd_pcm_runtime *runtime = substream->runtime;
  91         struct imx_pcm_runtime_data *iprtd = runtime->private_data;
  92         struct pt_regs regs;
  93
  94         get_fiq_regs(&regs);
  95         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
  96                 regs.ARM_r8 = (iprtd->period * iprtd->periods - 1) << 16;
  97         else
  98                 regs.ARM_r9 = (iprtd->period * iprtd->periods - 1) << 16;
  99
 100         set_fiq_regs(&regs);
 101
 102         return 0;
 103 }
 104
 105 static int fiq_enable;
 106 static int imx_pcm_fiq;
 107
 108 static int snd_imx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 109 {
 110         struct snd_pcm_runtime *runtime = substream->runtime;
 111         struct imx_pcm_runtime_data *iprtd = runtime->private_data;
 112
 113         switch (cmd) {
 114         case SNDRV_PCM_TRIGGER_START:
 115         case SNDRV_PCM_TRIGGER_RESUME:
 116         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 117                 iprtd->timer.expires = jiffies + iprtd->period_time;
 118                 add_timer(&iprtd->timer);
 119                 if (++fiq_enable == 1)
 120                         enable_fiq(imx_pcm_fiq);
 121
 122                 break;
 123
 124         case SNDRV_PCM_TRIGGER_STOP:
 125         case SNDRV_PCM_TRIGGER_SUSPEND:
 126         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 127                 del_timer(&iprtd->timer);
 128                 if (--fiq_enable == 0)
 129                         disable_fiq(imx_pcm_fiq);
 130
 131
 132                 break;
 133         default:
 134                 return -EINVAL;
 135         }
 136
 137         return 0;
 138 }
 139
 140 static snd_pcm_uframes_t snd_imx_pcm_pointer(struct snd_pcm_substream *substream)
 141 {
 142         struct snd_pcm_runtime *runtime = substream->runtime;
 143         struct imx_pcm_runtime_data *iprtd = runtime->private_data;
 144
 145         return bytes_to_frames(substream->runtime, iprtd->offset);
 146 }
 147
 148 static struct snd_pcm_hardware snd_imx_hardware = {
 149         .info = SNDRV_PCM_INFO_INTERLEAVED |
 150                 SNDRV_PCM_INFO_BLOCK_TRANSFER |
 151                 SNDRV_PCM_INFO_MMAP |
 152                 SNDRV_PCM_INFO_MMAP_VALID |
 153                 SNDRV_PCM_INFO_PAUSE |
 154                 SNDRV_PCM_INFO_RESUME,
 155         .formats = SNDRV_PCM_FMTBIT_S16_LE,
 156         .rate_min = 8000,
 157         .channels_min = 2,
 158         .channels_max = 2,
 159         .buffer_bytes_max = IMX_SSI_DMABUF_SIZE,
 160         .period_bytes_min = 128,
 161         .period_bytes_max = 16 * 1024,
 162         .periods_min = 2,
 163         .periods_max = 255,
 164         .fifo_size = 0,
 165 };
 166
 167 static int snd_imx_open(struct snd_pcm_substream *substream)
 168 {
 169         struct snd_pcm_runtime *runtime = substream->runtime;
 170         struct imx_pcm_runtime_data *iprtd;
 171         int ret;
 172
 173         iprtd = kzalloc(sizeof(*iprtd), GFP_KERNEL);
 174         runtime->private_data = iprtd;
 175
 176         init_timer(&iprtd->timer);
 177         iprtd->timer.data = (unsigned long)substream;
 178         iprtd->timer.function = imx_ssi_timer_callback;
 179
 180         ret = snd_pcm_hw_constraint_integer(substream->runtime,
 181                         SNDRV_PCM_HW_PARAM_PERIODS);
 182         if (ret < 0)
 183                 return ret;
 184
 185         snd_soc_set_runtime_hwparams(substream, &snd_imx_hardware);
 186         return 0;
 187 }
 188
 189 static int snd_imx_close(struct snd_pcm_substream *substream)
 190 {
 191         struct snd_pcm_runtime *runtime = substream->runtime;
 192         struct imx_pcm_runtime_data *iprtd = runtime->private_data;
 193
 194         del_timer_sync(&iprtd->timer);
 195         kfree(iprtd);
 196
 197         return 0;
 198 }
 199
 200 static struct snd_pcm_ops imx_pcm_ops = {
 201         .open           = snd_imx_open,
 202         .close          = snd_imx_close,
 203         .ioctl          = snd_pcm_lib_ioctl,
 204         .hw_params      = snd_imx_pcm_hw_params,
 205         .prepare        = snd_imx_pcm_prepare,
 206         .trigger        = snd_imx_pcm_trigger,
 207         .pointer        = snd_imx_pcm_pointer,
 208         .mmap           = snd_imx_pcm_mmap,
 209 };
 210
 211 static int imx_pcm_fiq_new(struct snd_card *card, struct snd_soc_dai *dai,
 212         struct snd_pcm *pcm)
 213 {
 214         int ret;
 215
 216         ret = imx_pcm_new(card, dai, pcm);
 217         if (ret)
 218                 return ret;
 219
 220         if (dai->playback.channels_min) {
 221                 struct snd_pcm_substream *substream =
 222                         pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream;
 223                 struct snd_dma_buffer *buf = &substream->dma_buffer;
 224
 225                 imx_ssi_fiq_tx_buffer = (unsigned long)buf->area;
 226         }
 227
 228         if (dai->capture.channels_min) {
 229                 struct snd_pcm_substream *substream =
 230                         pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream;
 231                 struct snd_dma_buffer *buf = &substream->dma_buffer;
 232
 233                 imx_ssi_fiq_rx_buffer = (unsigned long)buf->area;
 234         }
 235
 236         set_fiq_handler(&imx_ssi_fiq_start,
 237                 &imx_ssi_fiq_end - &imx_ssi_fiq_start);
 238
 239         return 0;
 240 }
 241
 242 static struct snd_soc_platform imx_soc_platform_fiq = {
 243         .pcm_ops        = &imx_pcm_ops,
 244         .pcm_new        = imx_pcm_fiq_new,
 245         .pcm_free       = imx_pcm_free,
 246 };
 247
 248 struct snd_soc_platform *imx_ssi_fiq_init(struct platform_device *pdev,
 249                 struct imx_ssi *ssi)
 250 {
 251         int ret = 0;
 252
 253         ret = claim_fiq(&fh);
 254         if (ret) {
 255                 dev_err(&pdev->dev, "failed to claim fiq: %d", ret);
 256                 return ERR_PTR(ret);
 257         }
 258
 259         mxc_set_irq_fiq(ssi->irq, 1);
 260
 261         imx_pcm_fiq = ssi->irq;
 262
 263         imx_ssi_fiq_base = (unsigned long)ssi->base;
 264
 265         ssi->dma_params_tx.burstsize = 4;
 266         ssi->dma_params_rx.burstsize = 6;
 267
 268         return &imx_soc_platform_fiq;
 269 }
 270
 271 void imx_ssi_fiq_exit(struct platform_device *pdev,
 272                 struct imx_ssi *ssi)
 273 {
 274         mxc_set_irq_fiq(ssi->irq, 0);
 275         release_fiq(&fh);
 276 }
 277