SAFE public projects git trees. - safe/jmp/linux-2.6/blob - 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         atomic_t running;
  45 };
  46
  47 static enum hrtimer_restart snd_hrtimer_callback(struct hrtimer *hrt)
  48 {
  49         struct imx_pcm_runtime_data *iprtd =
  50                 container_of(hrt, struct imx_pcm_runtime_data, hrt);
  51         struct snd_pcm_substream *substream = iprtd->substream;
  52         struct snd_pcm_runtime *runtime = substream->runtime;
  53         struct pt_regs regs;
  54         unsigned long delta;
  55
  56         if (!atomic_read(&iprtd->running))
  57                 return HRTIMER_NORESTART;
  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 >= iprtd->period) {
  76                 snd_pcm_period_elapsed(substream);
  77                 iprtd->last_offset = iprtd->offset;
  78         }
  79
  80         hrtimer_forward_now(hrt, ns_to_ktime(iprtd->poll_time_ns));
  81
  82         return HRTIMER_RESTART;
  83 }
  84
  85 static struct fiq_handler fh = {
  86         .name           = DRV_NAME,
  87 };
  88
  89 static int snd_imx_pcm_hw_params(struct snd_pcm_substream *substream,
  90                                 struct snd_pcm_hw_params *params)
  91 {
  92         struct snd_pcm_runtime *runtime = substream->runtime;
  93         struct imx_pcm_runtime_data *iprtd = runtime->private_data;
  94
  95         iprtd->size = params_buffer_bytes(params);
  96         iprtd->periods = params_periods(params);
  97         iprtd->period = params_period_bytes(params) ;
  98         iprtd->offset = 0;
  99         iprtd->last_offset = 0;
 100         iprtd->poll_time_ns = 1000000000 / params_rate(params) *
 101                                 params_period_size(params);
 102         snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
 103
 104         return 0;
 105 }
 106
 107 static int snd_imx_pcm_prepare(struct snd_pcm_substream *substream)
 108 {
 109         struct snd_pcm_runtime *runtime = substream->runtime;
 110         struct imx_pcm_runtime_data *iprtd = runtime->private_data;
 111         struct pt_regs regs;
 112
 113         get_fiq_regs(&regs);
 114         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 115                 regs.ARM_r8 = (iprtd->period * iprtd->periods - 1) << 16;
 116         else
 117                 regs.ARM_r9 = (iprtd->period * iprtd->periods - 1) << 16;
 118
 119         set_fiq_regs(&regs);
 120
 121         return 0;
 122 }
 123
 124 static int fiq_enable;
 125 static int imx_pcm_fiq;
 126
 127 static int snd_imx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 128 {
 129         struct snd_pcm_runtime *runtime = substream->runtime;
 130         struct imx_pcm_runtime_data *iprtd = runtime->private_data;
 131
 132         switch (cmd) {
 133         case SNDRV_PCM_TRIGGER_START:
 134         case SNDRV_PCM_TRIGGER_RESUME:
 135         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 136                 atomic_set(&iprtd->running, 1);
 137                 hrtimer_start(&iprtd->hrt, ns_to_ktime(iprtd->poll_time_ns),
 138                       HRTIMER_MODE_REL);
 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                 atomic_set(&iprtd->running, 0);
 148
 149                 if (--fiq_enable == 0)
 150                         disable_fiq(imx_pcm_fiq);
 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 = 4,
 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         iprtd->substream = substream;
 197
 198         atomic_set(&iprtd->running, 0);
 199         hrtimer_init(&iprtd->hrt, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
 200         iprtd->hrt.function = snd_hrtimer_callback;
 201
 202         ret = snd_pcm_hw_constraint_integer(substream->runtime,
 203                         SNDRV_PCM_HW_PARAM_PERIODS);
 204         if (ret < 0)
 205                 return ret;
 206
 207         snd_soc_set_runtime_hwparams(substream, &snd_imx_hardware);
 208         return 0;
 209 }
 210
 211 static int snd_imx_close(struct snd_pcm_substream *substream)
 212 {
 213         struct snd_pcm_runtime *runtime = substream->runtime;
 214         struct imx_pcm_runtime_data *iprtd = runtime->private_data;
 215
 216         hrtimer_cancel(&iprtd->hrt);
 217
 218         kfree(iprtd);
 219
 220         return 0;
 221 }
 222
 223 static struct snd_pcm_ops imx_pcm_ops = {
 224         .open           = snd_imx_open,
 225         .close          = snd_imx_close,
 226         .ioctl          = snd_pcm_lib_ioctl,
 227         .hw_params      = snd_imx_pcm_hw_params,
 228         .prepare        = snd_imx_pcm_prepare,
 229         .trigger        = snd_imx_pcm_trigger,
 230         .pointer        = snd_imx_pcm_pointer,
 231         .mmap           = snd_imx_pcm_mmap,
 232 };
 233
 234 static int imx_pcm_fiq_new(struct snd_card *card, struct snd_soc_dai *dai,
 235         struct snd_pcm *pcm)
 236 {
 237         int ret;
 238
 239         ret = imx_pcm_new(card, dai, pcm);
 240         if (ret)
 241                 return ret;
 242
 243         if (dai->playback.channels_min) {
 244                 struct snd_pcm_substream *substream =
 245                         pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream;
 246                 struct snd_dma_buffer *buf = &substream->dma_buffer;
 247
 248                 imx_ssi_fiq_tx_buffer = (unsigned long)buf->area;
 249         }
 250
 251         if (dai->capture.channels_min) {
 252                 struct snd_pcm_substream *substream =
 253                         pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream;
 254                 struct snd_dma_buffer *buf = &substream->dma_buffer;
 255
 256                 imx_ssi_fiq_rx_buffer = (unsigned long)buf->area;
 257         }
 258
 259         set_fiq_handler(&imx_ssi_fiq_start,
 260                 &imx_ssi_fiq_end - &imx_ssi_fiq_start);
 261
 262         return 0;
 263 }
 264
 265 static struct snd_soc_platform imx_soc_platform_fiq = {
 266         .pcm_ops        = &imx_pcm_ops,
 267         .pcm_new        = imx_pcm_fiq_new,
 268         .pcm_free       = imx_pcm_free,
 269 };
 270
 271 struct snd_soc_platform *imx_ssi_fiq_init(struct platform_device *pdev,
 272                 struct imx_ssi *ssi)
 273 {
 274         int ret = 0;
 275
 276         ret = claim_fiq(&fh);
 277         if (ret) {
 278                 dev_err(&pdev->dev, "failed to claim fiq: %d", ret);
 279                 return ERR_PTR(ret);
 280         }
 281
 282         mxc_set_irq_fiq(ssi->irq, 1);
 283
 284         imx_pcm_fiq = ssi->irq;
 285
 286         imx_ssi_fiq_base = (unsigned long)ssi->base;
 287
 288         ssi->dma_params_tx.burstsize = 4;
 289         ssi->dma_params_rx.burstsize = 6;
 290
 291         return &imx_soc_platform_fiq;
 292 }
 293
 294 void imx_ssi_fiq_exit(struct platform_device *pdev,
 295                 struct imx_ssi *ssi)
 296 {
 297         mxc_set_irq_fiq(ssi->irq, 0);
 298         release_fiq(&fh);
 299 }
 300