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