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 hrtimer hrt;
  42         int poll_time_ns;
  43         struct snd_pcm_substream *substream;
  44 };
  45
  46 static enum hrtimer_restart snd_hrtimer_callback(struct hrtimer *hrt)
  47 {
  48         struct imx_pcm_runtime_data *iprtd =
  49                 container_of(hrt, struct imx_pcm_runtime_data, hrt);
  50         struct snd_pcm_substream *substream = iprtd->substream;
  51         struct snd_pcm_runtime *runtime = substream->runtime;
  52         struct pt_regs regs;
  53         unsigned long delta;
  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         /* How much data have we transferred since the last period report? */
  63         if (iprtd->offset >= iprtd->last_offset)
  64                 delta = iprtd->offset - iprtd->last_offset;
  65         else
  66                 delta = runtime->buffer_size + iprtd->offset
  67                         - iprtd->last_offset;
  68
  69         /* If we've transferred at least a period then report it and
  70          * reset our poll time */
  71         if (delta >= iprtd->period) {
  72                 snd_pcm_period_elapsed(substream);
  73                 iprtd->last_offset = iprtd->offset;
  74         }
  75
  76         hrtimer_forward_now(hrt, ns_to_ktime(iprtd->poll_time_ns));
  77
  78         return HRTIMER_RESTART;
  79 }
  80
  81 static struct fiq_handler fh = {
  82         .name           = DRV_NAME,
  83 };
  84
  85 static int snd_imx_pcm_hw_params(struct snd_pcm_substream *substream,
  86                                 struct snd_pcm_hw_params *params)
  87 {
  88         struct snd_pcm_runtime *runtime = substream->runtime;
  89         struct imx_pcm_runtime_data *iprtd = runtime->private_data;
  90
  91         iprtd->size = params_buffer_bytes(params);
  92         iprtd->periods = params_periods(params);
  93         iprtd->period = params_period_bytes(params) ;
  94         iprtd->offset = 0;
  95         iprtd->last_offset = 0;
  96         iprtd->poll_time_ns = 1000000000 / params_rate(params) *
  97                                 params_period_size(params);
  98         snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
  99
 100         return 0;
 101 }
 102
 103 static int snd_imx_pcm_prepare(struct snd_pcm_substream *substream)
 104 {
 105         struct snd_pcm_runtime *runtime = substream->runtime;
 106         struct imx_pcm_runtime_data *iprtd = runtime->private_data;
 107         struct pt_regs regs;
 108
 109         get_fiq_regs(&regs);
 110         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 111                 regs.ARM_r8 = (iprtd->period * iprtd->periods - 1) << 16;
 112         else
 113                 regs.ARM_r9 = (iprtd->period * iprtd->periods - 1) << 16;
 114
 115         set_fiq_regs(&regs);
 116
 117         return 0;
 118 }
 119
 120 static int fiq_enable;
 121 static int imx_pcm_fiq;
 122
 123 static int snd_imx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 124 {
 125         struct snd_pcm_runtime *runtime = substream->runtime;
 126         struct imx_pcm_runtime_data *iprtd = runtime->private_data;
 127
 128         switch (cmd) {
 129         case SNDRV_PCM_TRIGGER_START:
 130         case SNDRV_PCM_TRIGGER_RESUME:
 131         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 132                 hrtimer_start(&iprtd->hrt, ns_to_ktime(iprtd->poll_time_ns),
 133                       HRTIMER_MODE_REL);
 134                 if (++fiq_enable == 1)
 135                         enable_fiq(imx_pcm_fiq);
 136
 137                 break;
 138
 139         case SNDRV_PCM_TRIGGER_STOP:
 140         case SNDRV_PCM_TRIGGER_SUSPEND:
 141         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 142                 hrtimer_cancel(&iprtd->hrt);
 143                 if (--fiq_enable == 0)
 144                         disable_fiq(imx_pcm_fiq);
 145
 146
 147                 break;
 148         default:
 149                 return -EINVAL;
 150         }
 151
 152         return 0;
 153 }
 154
 155 static snd_pcm_uframes_t snd_imx_pcm_pointer(struct snd_pcm_substream *substream)
 156 {
 157         struct snd_pcm_runtime *runtime = substream->runtime;
 158         struct imx_pcm_runtime_data *iprtd = runtime->private_data;
 159
 160         return bytes_to_frames(substream->runtime, iprtd->offset);
 161 }
 162
 163 static struct snd_pcm_hardware snd_imx_hardware = {
 164         .info = SNDRV_PCM_INFO_INTERLEAVED |
 165                 SNDRV_PCM_INFO_BLOCK_TRANSFER |
 166                 SNDRV_PCM_INFO_MMAP |
 167                 SNDRV_PCM_INFO_MMAP_VALID |
 168                 SNDRV_PCM_INFO_PAUSE |
 169                 SNDRV_PCM_INFO_RESUME,
 170         .formats = SNDRV_PCM_FMTBIT_S16_LE,
 171         .rate_min = 8000,
 172         .channels_min = 2,
 173         .channels_max = 2,
 174         .buffer_bytes_max = IMX_SSI_DMABUF_SIZE,
 175         .period_bytes_min = 128,
 176         .period_bytes_max = 16 * 1024,
 177         .periods_min = 2,
 178         .periods_max = 255,
 179         .fifo_size = 0,
 180 };
 181
 182 static int snd_imx_open(struct snd_pcm_substream *substream)
 183 {
 184         struct snd_pcm_runtime *runtime = substream->runtime;
 185         struct imx_pcm_runtime_data *iprtd;
 186         int ret;
 187
 188         iprtd = kzalloc(sizeof(*iprtd), GFP_KERNEL);
 189         runtime->private_data = iprtd;
 190
 191         iprtd->substream = substream;
 192
 193         hrtimer_init(&iprtd->hrt, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
 194         iprtd->hrt.function = snd_hrtimer_callback;
 195
 196         ret = snd_pcm_hw_constraint_integer(substream->runtime,
 197                         SNDRV_PCM_HW_PARAM_PERIODS);
 198         if (ret < 0)
 199                 return ret;
 200
 201         snd_soc_set_runtime_hwparams(substream, &snd_imx_hardware);
 202         return 0;
 203 }
 204
 205 static int snd_imx_close(struct snd_pcm_substream *substream)
 206 {
 207         struct snd_pcm_runtime *runtime = substream->runtime;
 208         struct imx_pcm_runtime_data *iprtd = runtime->private_data;
 209
 210         hrtimer_cancel(&iprtd->hrt);
 211
 212         kfree(iprtd);
 213
 214         return 0;
 215 }
 216
 217 static struct snd_pcm_ops imx_pcm_ops = {
 218         .open           = snd_imx_open,
 219         .close          = snd_imx_close,
 220         .ioctl          = snd_pcm_lib_ioctl,
 221         .hw_params      = snd_imx_pcm_hw_params,
 222         .prepare        = snd_imx_pcm_prepare,
 223         .trigger        = snd_imx_pcm_trigger,
 224         .pointer        = snd_imx_pcm_pointer,
 225         .mmap           = snd_imx_pcm_mmap,
 226 };
 227
 228 static int imx_pcm_fiq_new(struct snd_card *card, struct snd_soc_dai *dai,
 229         struct snd_pcm *pcm)
 230 {
 231         int ret;
 232
 233         ret = imx_pcm_new(card, dai, pcm);
 234         if (ret)
 235                 return ret;
 236
 237         if (dai->playback.channels_min) {
 238                 struct snd_pcm_substream *substream =
 239                         pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream;
 240                 struct snd_dma_buffer *buf = &substream->dma_buffer;
 241
 242                 imx_ssi_fiq_tx_buffer = (unsigned long)buf->area;
 243         }
 244
 245         if (dai->capture.channels_min) {
 246                 struct snd_pcm_substream *substream =
 247                         pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream;
 248                 struct snd_dma_buffer *buf = &substream->dma_buffer;
 249
 250                 imx_ssi_fiq_rx_buffer = (unsigned long)buf->area;
 251         }
 252
 253         set_fiq_handler(&imx_ssi_fiq_start,
 254                 &imx_ssi_fiq_end - &imx_ssi_fiq_start);
 255
 256         return 0;
 257 }
 258
 259 static struct snd_soc_platform imx_soc_platform_fiq = {
 260         .pcm_ops        = &imx_pcm_ops,
 261         .pcm_new        = imx_pcm_fiq_new,
 262         .pcm_free       = imx_pcm_free,
 263 };
 264
 265 struct snd_soc_platform *imx_ssi_fiq_init(struct platform_device *pdev,
 266                 struct imx_ssi *ssi)
 267 {
 268         int ret = 0;
 269
 270         ret = claim_fiq(&fh);
 271         if (ret) {
 272                 dev_err(&pdev->dev, "failed to claim fiq: %d", ret);
 273                 return ERR_PTR(ret);
 274         }
 275
 276         mxc_set_irq_fiq(ssi->irq, 1);
 277
 278         imx_pcm_fiq = ssi->irq;
 279
 280         imx_ssi_fiq_base = (unsigned long)ssi->base;
 281
 282         ssi->dma_params_tx.burstsize = 4;
 283         ssi->dma_params_rx.burstsize = 6;
 284
 285         return &imx_soc_platform_fiq;
 286 }
 287
 288 void imx_ssi_fiq_exit(struct platform_device *pdev,
 289                 struct imx_ssi *ssi)
 290 {
 291         mxc_set_irq_fiq(ssi->irq, 0);
 292         release_fiq(&fh);
 293 }
 294