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