sound/soc/kirkwood/kirkwood-dma.c

   1 /*
   2  * kirkwood-dma.c
   3  *
   4  * (c) 2010 Arnaud Patard <apatard@mandriva.com>
   5  * (c) 2010 Arnaud Patard <arnaud.patard@rtp-net.org>
   6  *
   7  *  This program is free software; you can redistribute  it and/or modify it
   8  *  under  the terms of  the GNU General  Public License as published by the
   9  *  Free Software Foundation;  either version 2 of the  License, or (at your
  10  *  option) any later version.
  11  */
  12
  13 #include <linux/init.h>
  14 #include <linux/module.h>
  15 #include <linux/device.h>
  16 #include <linux/io.h>
  17 #include <linux/slab.h>
  18 #include <linux/interrupt.h>
  19 #include <linux/dma-mapping.h>
  20 #include <linux/mbus.h>
  21 #include <sound/soc.h>
  22 #include "kirkwood.h"
  23
  24 #define KIRKWOOD_RATES \
  25         (SNDRV_PCM_RATE_8000_192000 |           \
  26          SNDRV_PCM_RATE_CONTINUOUS |            \
  27          SNDRV_PCM_RATE_KNOT)
  28
  29 #define KIRKWOOD_FORMATS \
  30         (SNDRV_PCM_FMTBIT_S16_LE | \
  31          SNDRV_PCM_FMTBIT_S24_LE | \
  32          SNDRV_PCM_FMTBIT_S32_LE)
  33
  34 static struct kirkwood_dma_data *kirkwood_priv(struct snd_pcm_substream *subs)
  35 {
  36         struct snd_soc_pcm_runtime *soc_runtime = subs->private_data;
  37         return snd_soc_dai_get_drvdata(soc_runtime->cpu_dai);
  38 }
  39
  40 static struct snd_pcm_hardware kirkwood_dma_snd_hw = {
  41         .info = (SNDRV_PCM_INFO_INTERLEAVED |
  42                  SNDRV_PCM_INFO_MMAP |
  43                  SNDRV_PCM_INFO_MMAP_VALID |
  44                  SNDRV_PCM_INFO_BLOCK_TRANSFER |
  45                  SNDRV_PCM_INFO_PAUSE),
  46         .formats                = KIRKWOOD_FORMATS,
  47         .rates                  = KIRKWOOD_RATES,
  48         .rate_min               = 8000,
  49         .rate_max               = 384000,
  50         .channels_min           = 1,
  51         .channels_max           = 8,
  52         .buffer_bytes_max       = KIRKWOOD_SND_MAX_BUFFER_BYTES,
  53         .period_bytes_min       = KIRKWOOD_SND_MIN_PERIOD_BYTES,
  54         .period_bytes_max       = KIRKWOOD_SND_MAX_PERIOD_BYTES,
  55         .periods_min            = KIRKWOOD_SND_MIN_PERIODS,
  56         .periods_max            = KIRKWOOD_SND_MAX_PERIODS,
  57         .fifo_size              = 0,
  58 };
  59
  60 static irqreturn_t kirkwood_dma_irq(int irq, void *dev_id)
  61 {
  62         struct kirkwood_dma_data *priv = dev_id;
  63         unsigned long mask, status, cause;
  64
  65         mask = readl(priv->io + KIRKWOOD_INT_MASK);
  66         status = readl(priv->io + KIRKWOOD_INT_CAUSE) & mask;
  67
  68         cause = readl(priv->io + KIRKWOOD_ERR_CAUSE);
  69         if (unlikely(cause)) {
  70                 printk(KERN_WARNING "%s: got err interrupt 0x%lx\n",
  71                                 __func__, cause);
  72                 writel(cause, priv->io + KIRKWOOD_ERR_CAUSE);
  73         }
  74
  75         /* we've enabled only bytes interrupts ... */
  76         if (status & ~(KIRKWOOD_INT_CAUSE_PLAY_BYTES | \
  77                         KIRKWOOD_INT_CAUSE_REC_BYTES)) {
  78                 printk(KERN_WARNING "%s: unexpected interrupt %lx\n",
  79                         __func__, status);
  80                 return IRQ_NONE;
  81         }
  82
  83         /* ack int */
  84         writel(status, priv->io + KIRKWOOD_INT_CAUSE);
  85
  86         if (status & KIRKWOOD_INT_CAUSE_PLAY_BYTES)
  87                 snd_pcm_period_elapsed(priv->substream_play);
  88
  89         if (status & KIRKWOOD_INT_CAUSE_REC_BYTES)
  90                 snd_pcm_period_elapsed(priv->substream_rec);
  91
  92         return IRQ_HANDLED;
  93 }
  94
  95 static void
  96 kirkwood_dma_conf_mbus_windows(void __iomem *base, int win,
  97                                unsigned long dma,
  98                                const struct mbus_dram_target_info *dram)
  99 {
 100         int i;
 101
 102         /* First disable and clear windows */
 103         writel(0, base + KIRKWOOD_AUDIO_WIN_CTRL_REG(win));
 104         writel(0, base + KIRKWOOD_AUDIO_WIN_BASE_REG(win));
 105
 106         /* try to find matching cs for current dma address */
 107         for (i = 0; i < dram->num_cs; i++) {
 108                 const struct mbus_dram_window *cs = dram->cs + i;
 109                 if ((cs->base & 0xffff0000) < (dma & 0xffff0000)) {
 110                         writel(cs->base & 0xffff0000,
 111                                 base + KIRKWOOD_AUDIO_WIN_BASE_REG(win));
 112                         writel(((cs->size - 1) & 0xffff0000) |
 113                                 (cs->mbus_attr << 8) |
 114                                 (dram->mbus_dram_target_id << 4) | 1,
 115                                 base + KIRKWOOD_AUDIO_WIN_CTRL_REG(win));
 116                 }
 117         }
 118 }
 119
 120 static int kirkwood_dma_open(struct snd_pcm_substream *substream)
 121 {
 122         int err;
 123         struct snd_pcm_runtime *runtime = substream->runtime;
 124         struct kirkwood_dma_data *priv = kirkwood_priv(substream);
 125         const struct mbus_dram_target_info *dram;
 126         unsigned long addr;
 127
 128         snd_soc_set_runtime_hwparams(substream, &kirkwood_dma_snd_hw);
 129
 130         /* Ensure that all constraints linked to dma burst are fulfilled */
 131         err = snd_pcm_hw_constraint_minmax(runtime,
 132                         SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
 133                         priv->burst * 2,
 134                         KIRKWOOD_AUDIO_BUF_MAX-1);
 135         if (err < 0)
 136                 return err;
 137
 138         err = snd_pcm_hw_constraint_step(runtime, 0,
 139                         SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
 140                         priv->burst);
 141         if (err < 0)
 142                 return err;
 143
 144         err = snd_pcm_hw_constraint_step(substream->runtime, 0,
 145                          SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
 146                          priv->burst);
 147         if (err < 0)
 148                 return err;
 149
 150         if (!priv->substream_play && !priv->substream_rec) {
 151                 err = request_irq(priv->irq, kirkwood_dma_irq, IRQF_SHARED,
 152                                   "kirkwood-i2s", priv);
 153                 if (err)
 154                         return -EBUSY;
 155
 156                 /*
 157                  * Enable Error interrupts. We're only ack'ing them but
 158                  * it's useful for diagnostics
 159                  */
 160                 writel((unsigned int)-1, priv->io + KIRKWOOD_ERR_MASK);
 161         }
 162
 163         dram = mv_mbus_dram_info();
 164         addr = substream->dma_buffer.addr;
 165         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 166                 priv->substream_play = substream;
 167                 kirkwood_dma_conf_mbus_windows(priv->io,
 168                         KIRKWOOD_PLAYBACK_WIN, addr, dram);
 169         } else {
 170                 priv->substream_rec = substream;
 171                 kirkwood_dma_conf_mbus_windows(priv->io,
 172                         KIRKWOOD_RECORD_WIN, addr, dram);
 173         }
 174
 175         return 0;
 176 }
 177
 178 static int kirkwood_dma_close(struct snd_pcm_substream *substream)
 179 {
 180         struct kirkwood_dma_data *priv = kirkwood_priv(substream);
 181
 182         if (!priv)
 183                 return 0;
 184
 185         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 186                 priv->substream_play = NULL;
 187         else
 188                 priv->substream_rec = NULL;
 189
 190         if (!priv->substream_play && !priv->substream_rec) {
 191                 writel(0, priv->io + KIRKWOOD_ERR_MASK);
 192                 free_irq(priv->irq, priv);
 193         }
 194
 195         return 0;
 196 }
 197
 198 static int kirkwood_dma_hw_params(struct snd_pcm_substream *substream,
 199                                 struct snd_pcm_hw_params *params)
 200 {
 201         struct snd_pcm_runtime *runtime = substream->runtime;
 202
 203         snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
 204         runtime->dma_bytes = params_buffer_bytes(params);
 205
 206         return 0;
 207 }
 208
 209 static int kirkwood_dma_hw_free(struct snd_pcm_substream *substream)
 210 {
 211         snd_pcm_set_runtime_buffer(substream, NULL);
 212         return 0;
 213 }
 214
 215 static int kirkwood_dma_prepare(struct snd_pcm_substream *substream)
 216 {
 217         struct snd_pcm_runtime *runtime = substream->runtime;
 218         struct kirkwood_dma_data *priv = kirkwood_priv(substream);
 219         unsigned long size, count;
 220
 221         /* compute buffer size in term of "words" as requested in specs */
 222         size = frames_to_bytes(runtime, runtime->buffer_size);
 223         size = (size>>2)-1;
 224         count = snd_pcm_lib_period_bytes(substream);
 225
 226         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 227                 writel(count, priv->io + KIRKWOOD_PLAY_BYTE_INT_COUNT);
 228                 writel(runtime->dma_addr, priv->io + KIRKWOOD_PLAY_BUF_ADDR);
 229                 writel(size, priv->io + KIRKWOOD_PLAY_BUF_SIZE);
 230         } else {
 231                 writel(count, priv->io + KIRKWOOD_REC_BYTE_INT_COUNT);
 232                 writel(runtime->dma_addr, priv->io + KIRKWOOD_REC_BUF_ADDR);
 233                 writel(size, priv->io + KIRKWOOD_REC_BUF_SIZE);
 234         }
 235
 236
 237         return 0;
 238 }
 239
 240 static snd_pcm_uframes_t kirkwood_dma_pointer(struct snd_pcm_substream
 241                                                 *substream)
 242 {
 243         struct kirkwood_dma_data *priv = kirkwood_priv(substream);
 244         snd_pcm_uframes_t count;
 245
 246         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 247                 count = bytes_to_frames(substream->runtime,
 248                         readl(priv->io + KIRKWOOD_PLAY_BYTE_COUNT));
 249         else
 250                 count = bytes_to_frames(substream->runtime,
 251                         readl(priv->io + KIRKWOOD_REC_BYTE_COUNT));
 252
 253         return count;
 254 }
 255
 256 static struct snd_pcm_ops kirkwood_dma_ops = {
 257         .open =         kirkwood_dma_open,
 258         .close =        kirkwood_dma_close,
 259         .ioctl =        snd_pcm_lib_ioctl,
 260         .hw_params =    kirkwood_dma_hw_params,
 261         .hw_free =      kirkwood_dma_hw_free,
 262         .prepare =      kirkwood_dma_prepare,
 263         .pointer =      kirkwood_dma_pointer,
 264 };
 265
 266 static int kirkwood_dma_preallocate_dma_buffer(struct snd_pcm *pcm,
 267                 int stream)
 268 {
 269         struct snd_pcm_substream *substream = pcm->streams[stream].substream;
 270         struct snd_dma_buffer *buf = &substream->dma_buffer;
 271         size_t size = kirkwood_dma_snd_hw.buffer_bytes_max;
 272
 273         buf->dev.type = SNDRV_DMA_TYPE_DEV;
 274         buf->dev.dev = pcm->card->dev;
 275         buf->area = dma_alloc_coherent(pcm->card->dev, size,
 276                         &buf->addr, GFP_KERNEL);
 277         if (!buf->area)
 278                 return -ENOMEM;
 279         buf->bytes = size;
 280         buf->private_data = NULL;
 281
 282         return 0;
 283 }
 284
 285 static int kirkwood_dma_new(struct snd_soc_pcm_runtime *rtd)
 286 {
 287         struct snd_card *card = rtd->card->snd_card;
 288         struct snd_pcm *pcm = rtd->pcm;
 289         int ret;
 290
 291         ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
 292         if (ret)
 293                 return ret;
 294
 295         if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
 296                 ret = kirkwood_dma_preallocate_dma_buffer(pcm,
 297                                 SNDRV_PCM_STREAM_PLAYBACK);
 298                 if (ret)
 299                         return ret;
 300         }
 301
 302         if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
 303                 ret = kirkwood_dma_preallocate_dma_buffer(pcm,
 304                                 SNDRV_PCM_STREAM_CAPTURE);
 305                 if (ret)
 306                         return ret;
 307         }
 308
 309         return 0;
 310 }
 311
 312 static void kirkwood_dma_free_dma_buffers(struct snd_pcm *pcm)
 313 {
 314         struct snd_pcm_substream *substream;
 315         struct snd_dma_buffer *buf;
 316         int stream;
 317
 318         for (stream = 0; stream < 2; stream++) {
 319                 substream = pcm->streams[stream].substream;
 320                 if (!substream)
 321                         continue;
 322                 buf = &substream->dma_buffer;
 323                 if (!buf->area)
 324                         continue;
 325
 326                 dma_free_coherent(pcm->card->dev, buf->bytes,
 327                                 buf->area, buf->addr);
 328                 buf->area = NULL;
 329         }
 330 }
 331
 332 struct snd_soc_platform_driver kirkwood_soc_platform = {
 333         .ops            = &kirkwood_dma_ops,
 334         .pcm_new        = kirkwood_dma_new,
 335         .pcm_free       = kirkwood_dma_free_dma_buffers,
 336 };