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          SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE | \
  34          SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_BE)
  35
  36 static struct kirkwood_dma_data *kirkwood_priv(struct snd_pcm_substream *subs)
  37 {
  38         struct snd_soc_pcm_runtime *soc_runtime = subs->private_data;
  39         return snd_soc_dai_get_drvdata(soc_runtime->cpu_dai);
  40 }
  41
  42 static struct snd_pcm_hardware kirkwood_dma_snd_hw = {
  43         .info = (SNDRV_PCM_INFO_INTERLEAVED |
  44                  SNDRV_PCM_INFO_MMAP |
  45                  SNDRV_PCM_INFO_MMAP_VALID |
  46                  SNDRV_PCM_INFO_BLOCK_TRANSFER |
  47                  SNDRV_PCM_INFO_PAUSE),
  48         .formats                = KIRKWOOD_FORMATS,
  49         .rates                  = KIRKWOOD_RATES,
  50         .rate_min               = 8000,
  51         .rate_max               = 384000,
  52         .channels_min           = 1,
  53         .channels_max           = 8,
  54         .buffer_bytes_max       = KIRKWOOD_SND_MAX_BUFFER_BYTES,
  55         .period_bytes_min       = KIRKWOOD_SND_MIN_PERIOD_BYTES,
  56         .period_bytes_max       = KIRKWOOD_SND_MAX_PERIOD_BYTES,
  57         .periods_min            = KIRKWOOD_SND_MIN_PERIODS,
  58         .periods_max            = KIRKWOOD_SND_MAX_PERIODS,
  59         .fifo_size              = 0,
  60 };
  61
  62 static irqreturn_t kirkwood_dma_irq(int irq, void *dev_id)
  63 {
  64         struct kirkwood_dma_data *priv = dev_id;
  65         unsigned long mask, status, cause;
  66
  67         mask = readl(priv->io + KIRKWOOD_INT_MASK);
  68         status = readl(priv->io + KIRKWOOD_INT_CAUSE) & mask;
  69
  70         cause = readl(priv->io + KIRKWOOD_ERR_CAUSE);
  71         if (unlikely(cause)) {
  72                 printk(KERN_WARNING "%s: got err interrupt 0x%lx\n",
  73                                 __func__, cause);
  74                 writel(cause, priv->io + KIRKWOOD_ERR_CAUSE);
  75         }
  76
  77         /* we've enabled only bytes interrupts ... */
  78         if (status & ~(KIRKWOOD_INT_CAUSE_PLAY_BYTES | \
  79                         KIRKWOOD_INT_CAUSE_REC_BYTES)) {
  80                 printk(KERN_WARNING "%s: unexpected interrupt %lx\n",
  81                         __func__, status);
  82                 return IRQ_NONE;
  83         }
  84
  85         /* ack int */
  86         writel(status, priv->io + KIRKWOOD_INT_CAUSE);
  87
  88         if (status & KIRKWOOD_INT_CAUSE_PLAY_BYTES)
  89                 snd_pcm_period_elapsed(priv->substream_play);
  90
  91         if (status & KIRKWOOD_INT_CAUSE_REC_BYTES)
  92                 snd_pcm_period_elapsed(priv->substream_rec);
  93
  94         return IRQ_HANDLED;
  95 }
  96
  97 static void
  98 kirkwood_dma_conf_mbus_windows(void __iomem *base, int win,
  99                                unsigned long dma,
 100                                const struct mbus_dram_target_info *dram)
 101 {
 102         int i;
 103
 104         /* First disable and clear windows */
 105         writel(0, base + KIRKWOOD_AUDIO_WIN_CTRL_REG(win));
 106         writel(0, base + KIRKWOOD_AUDIO_WIN_BASE_REG(win));
 107
 108         /* try to find matching cs for current dma address */
 109         for (i = 0; i < dram->num_cs; i++) {
 110                 const struct mbus_dram_window *cs = dram->cs + i;
 111                 if ((cs->base & 0xffff0000) < (dma & 0xffff0000)) {
 112                         writel(cs->base & 0xffff0000,
 113                                 base + KIRKWOOD_AUDIO_WIN_BASE_REG(win));
 114                         writel(((cs->size - 1) & 0xffff0000) |
 115                                 (cs->mbus_attr << 8) |
 116                                 (dram->mbus_dram_target_id << 4) | 1,
 117                                 base + KIRKWOOD_AUDIO_WIN_CTRL_REG(win));
 118                 }
 119         }
 120 }
 121
 122 static int kirkwood_dma_open(struct snd_pcm_substream *substream)
 123 {
 124         int err;
 125         struct snd_pcm_runtime *runtime = substream->runtime;
 126         struct kirkwood_dma_data *priv = kirkwood_priv(substream);
 127         const struct mbus_dram_target_info *dram;
 128         unsigned long addr;
 129
 130         snd_soc_set_runtime_hwparams(substream, &kirkwood_dma_snd_hw);
 131
 132         /* Ensure that all constraints linked to dma burst are fulfilled */
 133         err = snd_pcm_hw_constraint_minmax(runtime,
 134                         SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
 135                         priv->burst * 2,
 136                         KIRKWOOD_AUDIO_BUF_MAX-1);
 137         if (err < 0)
 138                 return err;
 139
 140         err = snd_pcm_hw_constraint_step(runtime, 0,
 141                         SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
 142                         priv->burst);
 143         if (err < 0)
 144                 return err;
 145
 146         err = snd_pcm_hw_constraint_step(substream->runtime, 0,
 147                          SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
 148                          priv->burst);
 149         if (err < 0)
 150                 return err;
 151
 152         if (!priv->substream_play && !priv->substream_rec) {
 153                 err = request_irq(priv->irq, kirkwood_dma_irq, IRQF_SHARED,
 154                                   "kirkwood-i2s", priv);
 155                 if (err)
 156                         return -EBUSY;
 157
 158                 /*
 159                  * Enable Error interrupts. We're only ack'ing them but
 160                  * it's useful for diagnostics
 161                  */
 162                 writel((unsigned long)-1, priv->io + KIRKWOOD_ERR_MASK);
 163         }
 164
 165         dram = mv_mbus_dram_info();
 166         addr = substream->dma_buffer.addr;
 167         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 168                 priv->substream_play = substream;
 169                 kirkwood_dma_conf_mbus_windows(priv->io,
 170                         KIRKWOOD_PLAYBACK_WIN, addr, dram);
 171         } else {
 172                 priv->substream_rec = substream;
 173                 kirkwood_dma_conf_mbus_windows(priv->io,
 174                         KIRKWOOD_RECORD_WIN, addr, dram);
 175         }
 176
 177         return 0;
 178 }
 179
 180 static int kirkwood_dma_close(struct snd_pcm_substream *substream)
 181 {
 182         struct kirkwood_dma_data *priv = kirkwood_priv(substream);
 183
 184         if (!priv)
 185                 return 0;
 186
 187         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 188                 priv->substream_play = NULL;
 189         else
 190                 priv->substream_rec = NULL;
 191
 192         if (!priv->substream_play && !priv->substream_rec) {
 193                 writel(0, priv->io + KIRKWOOD_ERR_MASK);
 194                 free_irq(priv->irq, priv);
 195         }
 196
 197         return 0;
 198 }
 199
 200 static int kirkwood_dma_hw_params(struct snd_pcm_substream *substream,
 201                                 struct snd_pcm_hw_params *params)
 202 {
 203         struct snd_pcm_runtime *runtime = substream->runtime;
 204
 205         snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
 206         runtime->dma_bytes = params_buffer_bytes(params);
 207
 208         return 0;
 209 }
 210
 211 static int kirkwood_dma_hw_free(struct snd_pcm_substream *substream)
 212 {
 213         snd_pcm_set_runtime_buffer(substream, NULL);
 214         return 0;
 215 }
 216
 217 static int kirkwood_dma_prepare(struct snd_pcm_substream *substream)
 218 {
 219         struct snd_pcm_runtime *runtime = substream->runtime;
 220         struct kirkwood_dma_data *priv = kirkwood_priv(substream);
 221         unsigned long size, count;
 222
 223         /* compute buffer size in term of "words" as requested in specs */
 224         size = frames_to_bytes(runtime, runtime->buffer_size);
 225         size = (size>>2)-1;
 226         count = snd_pcm_lib_period_bytes(substream);
 227
 228         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 229                 writel(count, priv->io + KIRKWOOD_PLAY_BYTE_INT_COUNT);
 230                 writel(runtime->dma_addr, priv->io + KIRKWOOD_PLAY_BUF_ADDR);
 231                 writel(size, priv->io + KIRKWOOD_PLAY_BUF_SIZE);
 232         } else {
 233                 writel(count, priv->io + KIRKWOOD_REC_BYTE_INT_COUNT);
 234                 writel(runtime->dma_addr, priv->io + KIRKWOOD_REC_BUF_ADDR);
 235                 writel(size, priv->io + KIRKWOOD_REC_BUF_SIZE);
 236         }
 237
 238
 239         return 0;
 240 }
 241
 242 static snd_pcm_uframes_t kirkwood_dma_pointer(struct snd_pcm_substream
 243                                                 *substream)
 244 {
 245         struct kirkwood_dma_data *priv = kirkwood_priv(substream);
 246         snd_pcm_uframes_t count;
 247
 248         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 249                 count = bytes_to_frames(substream->runtime,
 250                         readl(priv->io + KIRKWOOD_PLAY_BYTE_COUNT));
 251         else
 252                 count = bytes_to_frames(substream->runtime,
 253                         readl(priv->io + KIRKWOOD_REC_BYTE_COUNT));
 254
 255         return count;
 256 }
 257
 258 static struct snd_pcm_ops kirkwood_dma_ops = {
 259         .open =         kirkwood_dma_open,
 260         .close =        kirkwood_dma_close,
 261         .ioctl =        snd_pcm_lib_ioctl,
 262         .hw_params =    kirkwood_dma_hw_params,
 263         .hw_free =      kirkwood_dma_hw_free,
 264         .prepare =      kirkwood_dma_prepare,
 265         .pointer =      kirkwood_dma_pointer,
 266 };
 267
 268 static int kirkwood_dma_preallocate_dma_buffer(struct snd_pcm *pcm,
 269                 int stream)
 270 {
 271         struct snd_pcm_substream *substream = pcm->streams[stream].substream;
 272         struct snd_dma_buffer *buf = &substream->dma_buffer;
 273         size_t size = kirkwood_dma_snd_hw.buffer_bytes_max;
 274
 275         buf->dev.type = SNDRV_DMA_TYPE_DEV;
 276         buf->dev.dev = pcm->card->dev;
 277         buf->area = dma_alloc_coherent(pcm->card->dev, size,
 278                         &buf->addr, GFP_KERNEL);
 279         if (!buf->area)
 280                 return -ENOMEM;
 281         buf->bytes = size;
 282         buf->private_data = NULL;
 283
 284         return 0;
 285 }
 286
 287 static int kirkwood_dma_new(struct snd_soc_pcm_runtime *rtd)
 288 {
 289         struct snd_card *card = rtd->card->snd_card;
 290         struct snd_pcm *pcm = rtd->pcm;
 291         int ret;
 292
 293         ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
 294         if (ret)
 295                 return ret;
 296
 297         if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
 298                 ret = kirkwood_dma_preallocate_dma_buffer(pcm,
 299                                 SNDRV_PCM_STREAM_PLAYBACK);
 300                 if (ret)
 301                         return ret;
 302         }
 303
 304         if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
 305                 ret = kirkwood_dma_preallocate_dma_buffer(pcm,
 306                                 SNDRV_PCM_STREAM_CAPTURE);
 307                 if (ret)
 308                         return ret;
 309         }
 310
 311         return 0;
 312 }
 313
 314 static void kirkwood_dma_free_dma_buffers(struct snd_pcm *pcm)
 315 {
 316         struct snd_pcm_substream *substream;
 317         struct snd_dma_buffer *buf;
 318         int stream;
 319
 320         for (stream = 0; stream < 2; stream++) {
 321                 substream = pcm->streams[stream].substream;
 322                 if (!substream)
 323                         continue;
 324                 buf = &substream->dma_buffer;
 325                 if (!buf->area)
 326                         continue;
 327
 328                 dma_free_coherent(pcm->card->dev, buf->bytes,
 329                                 buf->area, buf->addr);
 330                 buf->area = NULL;
 331         }
 332 }
 333
 334 struct snd_soc_platform_driver kirkwood_soc_platform = {
 335         .ops            = &kirkwood_dma_ops,
 336         .pcm_new        = kirkwood_dma_new,
 337         .pcm_free       = kirkwood_dma_free_dma_buffers,
 338 };