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 u64 kirkwood_dma_dmamask = DMA_BIT_MASK(32);
  63
  64 static irqreturn_t kirkwood_dma_irq(int irq, void *dev_id)
  65 {
  66         struct kirkwood_dma_data *priv = dev_id;
  67         unsigned long mask, status, cause;
  68
  69         mask = readl(priv->io + KIRKWOOD_INT_MASK);
  70         status = readl(priv->io + KIRKWOOD_INT_CAUSE) & mask;
  71
  72         cause = readl(priv->io + KIRKWOOD_ERR_CAUSE);
  73         if (unlikely(cause)) {
  74                 printk(KERN_WARNING "%s: got err interrupt 0x%lx\n",
  75                                 __func__, cause);
  76                 writel(cause, priv->io + KIRKWOOD_ERR_CAUSE);
  77         }
  78
  79         /* we've enabled only bytes interrupts ... */
  80         if (status & ~(KIRKWOOD_INT_CAUSE_PLAY_BYTES | \
  81                         KIRKWOOD_INT_CAUSE_REC_BYTES)) {
  82                 printk(KERN_WARNING "%s: unexpected interrupt %lx\n",
  83                         __func__, status);
  84                 return IRQ_NONE;
  85         }
  86
  87         /* ack int */
  88         writel(status, priv->io + KIRKWOOD_INT_CAUSE);
  89
  90         if (status & KIRKWOOD_INT_CAUSE_PLAY_BYTES)
  91                 snd_pcm_period_elapsed(priv->substream_play);
  92
  93         if (status & KIRKWOOD_INT_CAUSE_REC_BYTES)
  94                 snd_pcm_period_elapsed(priv->substream_rec);
  95
  96         return IRQ_HANDLED;
  97 }
  98
  99 static void
 100 kirkwood_dma_conf_mbus_windows(void __iomem *base, int win,
 101                                unsigned long dma,
 102                                const struct mbus_dram_target_info *dram)
 103 {
 104         int i;
 105
 106         /* First disable and clear windows */
 107         writel(0, base + KIRKWOOD_AUDIO_WIN_CTRL_REG(win));
 108         writel(0, base + KIRKWOOD_AUDIO_WIN_BASE_REG(win));
 109
 110         /* try to find matching cs for current dma address */
 111         for (i = 0; i < dram->num_cs; i++) {
 112                 const struct mbus_dram_window *cs = dram->cs + i;
 113                 if ((cs->base & 0xffff0000) < (dma & 0xffff0000)) {
 114                         writel(cs->base & 0xffff0000,
 115                                 base + KIRKWOOD_AUDIO_WIN_BASE_REG(win));
 116                         writel(((cs->size - 1) & 0xffff0000) |
 117                                 (cs->mbus_attr << 8) |
 118                                 (dram->mbus_dram_target_id << 4) | 1,
 119                                 base + KIRKWOOD_AUDIO_WIN_CTRL_REG(win));
 120                 }
 121         }
 122 }
 123
 124 static int kirkwood_dma_open(struct snd_pcm_substream *substream)
 125 {
 126         int err;
 127         struct snd_pcm_runtime *runtime = substream->runtime;
 128         struct kirkwood_dma_data *priv = kirkwood_priv(substream);
 129         const struct mbus_dram_target_info *dram;
 130         unsigned long addr;
 131
 132         snd_soc_set_runtime_hwparams(substream, &kirkwood_dma_snd_hw);
 133
 134         /* Ensure that all constraints linked to dma burst are fulfilled */
 135         err = snd_pcm_hw_constraint_minmax(runtime,
 136                         SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
 137                         priv->burst * 2,
 138                         KIRKWOOD_AUDIO_BUF_MAX-1);
 139         if (err < 0)
 140                 return err;
 141
 142         err = snd_pcm_hw_constraint_step(runtime, 0,
 143                         SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
 144                         priv->burst);
 145         if (err < 0)
 146                 return err;
 147
 148         err = snd_pcm_hw_constraint_step(substream->runtime, 0,
 149                          SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
 150                          priv->burst);
 151         if (err < 0)
 152                 return err;
 153
 154         if (!priv->substream_play && !priv->substream_rec) {
 155                 err = request_irq(priv->irq, kirkwood_dma_irq, IRQF_SHARED,
 156                                   "kirkwood-i2s", priv);
 157                 if (err)
 158                         return -EBUSY;
 159
 160                 /*
 161                  * Enable Error interrupts. We're only ack'ing them but
 162                  * it's useful for diagnostics
 163                  */
 164                 writel((unsigned long)-1, priv->io + KIRKWOOD_ERR_MASK);
 165         }
 166
 167         dram = mv_mbus_dram_info();
 168         addr = substream->dma_buffer.addr;
 169         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 170                 priv->substream_play = substream;
 171                 kirkwood_dma_conf_mbus_windows(priv->io,
 172                         KIRKWOOD_PLAYBACK_WIN, addr, dram);
 173         } else {
 174                 priv->substream_rec = substream;
 175                 kirkwood_dma_conf_mbus_windows(priv->io,
 176                         KIRKWOOD_RECORD_WIN, addr, dram);
 177         }
 178
 179         return 0;
 180 }
 181
 182 static int kirkwood_dma_close(struct snd_pcm_substream *substream)
 183 {
 184         struct kirkwood_dma_data *priv = kirkwood_priv(substream);
 185
 186         if (!priv)
 187                 return 0;
 188
 189         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 190                 priv->substream_play = NULL;
 191         else
 192                 priv->substream_rec = NULL;
 193
 194         if (!priv->substream_play && !priv->substream_rec) {
 195                 writel(0, priv->io + KIRKWOOD_ERR_MASK);
 196                 free_irq(priv->irq, priv);
 197         }
 198
 199         return 0;
 200 }
 201
 202 static int kirkwood_dma_hw_params(struct snd_pcm_substream *substream,
 203                                 struct snd_pcm_hw_params *params)
 204 {
 205         struct snd_pcm_runtime *runtime = substream->runtime;
 206
 207         snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
 208         runtime->dma_bytes = params_buffer_bytes(params);
 209
 210         return 0;
 211 }
 212
 213 static int kirkwood_dma_hw_free(struct snd_pcm_substream *substream)
 214 {
 215         snd_pcm_set_runtime_buffer(substream, NULL);
 216         return 0;
 217 }
 218
 219 static int kirkwood_dma_prepare(struct snd_pcm_substream *substream)
 220 {
 221         struct snd_pcm_runtime *runtime = substream->runtime;
 222         struct kirkwood_dma_data *priv = kirkwood_priv(substream);
 223         unsigned long size, count;
 224
 225         /* compute buffer size in term of "words" as requested in specs */
 226         size = frames_to_bytes(runtime, runtime->buffer_size);
 227         size = (size>>2)-1;
 228         count = snd_pcm_lib_period_bytes(substream);
 229
 230         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 231                 writel(count, priv->io + KIRKWOOD_PLAY_BYTE_INT_COUNT);
 232                 writel(runtime->dma_addr, priv->io + KIRKWOOD_PLAY_BUF_ADDR);
 233                 writel(size, priv->io + KIRKWOOD_PLAY_BUF_SIZE);
 234         } else {
 235                 writel(count, priv->io + KIRKWOOD_REC_BYTE_INT_COUNT);
 236                 writel(runtime->dma_addr, priv->io + KIRKWOOD_REC_BUF_ADDR);
 237                 writel(size, priv->io + KIRKWOOD_REC_BUF_SIZE);
 238         }
 239
 240
 241         return 0;
 242 }
 243
 244 static snd_pcm_uframes_t kirkwood_dma_pointer(struct snd_pcm_substream
 245                                                 *substream)
 246 {
 247         struct kirkwood_dma_data *priv = kirkwood_priv(substream);
 248         snd_pcm_uframes_t count;
 249
 250         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 251                 count = bytes_to_frames(substream->runtime,
 252                         readl(priv->io + KIRKWOOD_PLAY_BYTE_COUNT));
 253         else
 254                 count = bytes_to_frames(substream->runtime,
 255                         readl(priv->io + KIRKWOOD_REC_BYTE_COUNT));
 256
 257         return count;
 258 }
 259
 260 static struct snd_pcm_ops kirkwood_dma_ops = {
 261         .open =         kirkwood_dma_open,
 262         .close =        kirkwood_dma_close,
 263         .ioctl =        snd_pcm_lib_ioctl,
 264         .hw_params =    kirkwood_dma_hw_params,
 265         .hw_free =      kirkwood_dma_hw_free,
 266         .prepare =      kirkwood_dma_prepare,
 267         .pointer =      kirkwood_dma_pointer,
 268 };
 269
 270 static int kirkwood_dma_preallocate_dma_buffer(struct snd_pcm *pcm,
 271                 int stream)
 272 {
 273         struct snd_pcm_substream *substream = pcm->streams[stream].substream;
 274         struct snd_dma_buffer *buf = &substream->dma_buffer;
 275         size_t size = kirkwood_dma_snd_hw.buffer_bytes_max;
 276
 277         buf->dev.type = SNDRV_DMA_TYPE_DEV;
 278         buf->dev.dev = pcm->card->dev;
 279         buf->area = dma_alloc_coherent(pcm->card->dev, size,
 280                         &buf->addr, GFP_KERNEL);
 281         if (!buf->area)
 282                 return -ENOMEM;
 283         buf->bytes = size;
 284         buf->private_data = NULL;
 285
 286         return 0;
 287 }
 288
 289 static int kirkwood_dma_new(struct snd_soc_pcm_runtime *rtd)
 290 {
 291         struct snd_card *card = rtd->card->snd_card;
 292         struct snd_pcm *pcm = rtd->pcm;
 293         int ret;
 294
 295         if (!card->dev->dma_mask)
 296                 card->dev->dma_mask = &kirkwood_dma_dmamask;
 297         if (!card->dev->coherent_dma_mask)
 298                 card->dev->coherent_dma_mask = DMA_BIT_MASK(32);
 299
 300         if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
 301                 ret = kirkwood_dma_preallocate_dma_buffer(pcm,
 302                                 SNDRV_PCM_STREAM_PLAYBACK);
 303                 if (ret)
 304                         return ret;
 305         }
 306
 307         if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
 308                 ret = kirkwood_dma_preallocate_dma_buffer(pcm,
 309                                 SNDRV_PCM_STREAM_CAPTURE);
 310                 if (ret)
 311                         return ret;
 312         }
 313
 314         return 0;
 315 }
 316
 317 static void kirkwood_dma_free_dma_buffers(struct snd_pcm *pcm)
 318 {
 319         struct snd_pcm_substream *substream;
 320         struct snd_dma_buffer *buf;
 321         int stream;
 322
 323         for (stream = 0; stream < 2; stream++) {
 324                 substream = pcm->streams[stream].substream;
 325                 if (!substream)
 326                         continue;
 327                 buf = &substream->dma_buffer;
 328                 if (!buf->area)
 329                         continue;
 330
 331                 dma_free_coherent(pcm->card->dev, buf->bytes,
 332                                 buf->area, buf->addr);
 333                 buf->area = NULL;
 334         }
 335 }
 336
 337 struct snd_soc_platform_driver kirkwood_soc_platform = {
 338         .ops            = &kirkwood_dma_ops,
 339         .pcm_new        = kirkwood_dma_new,
 340         .pcm_free       = kirkwood_dma_free_dma_buffers,
 341 };