kernel/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                 priv->substream_play = substream;
 152                 kirkwood_dma_conf_mbus_windows(priv->io,
 153                         KIRKWOOD_PLAYBACK_WIN, addr, dram);
 154         } else {
 155                 priv->substream_rec = substream;
 156                 kirkwood_dma_conf_mbus_windows(priv->io,
 157                         KIRKWOOD_RECORD_WIN, addr, dram);
 158         }
 159
 160         return 0;
 161 }
 162
 163 static int kirkwood_dma_close(struct snd_pcm_substream *substream)
 164 {
 165         struct kirkwood_dma_data *priv = kirkwood_priv(substream);
 166
 167         if (!priv)
 168                 return 0;
 169
 170         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 171                 priv->substream_play = NULL;
 172         else
 173                 priv->substream_rec = NULL;
 174
 175         if (!priv->substream_play && !priv->substream_rec) {
 176                 writel(0, priv->io + KIRKWOOD_ERR_MASK);
 177                 free_irq(priv->irq, priv);
 178         }
 179
 180         return 0;
 181 }
 182
 183 static int kirkwood_dma_hw_params(struct snd_pcm_substream *substream,
 184                                 struct snd_pcm_hw_params *params)
 185 {
 186         struct snd_pcm_runtime *runtime = substream->runtime;
 187
 188         snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
 189         runtime->dma_bytes = params_buffer_bytes(params);
 190
 191         return 0;
 192 }
 193
 194 static int kirkwood_dma_hw_free(struct snd_pcm_substream *substream)
 195 {
 196         snd_pcm_set_runtime_buffer(substream, NULL);
 197         return 0;
 198 }
 199
 200 static int kirkwood_dma_prepare(struct snd_pcm_substream *substream)
 201 {
 202         struct snd_pcm_runtime *runtime = substream->runtime;
 203         struct kirkwood_dma_data *priv = kirkwood_priv(substream);
 204         unsigned long size, count;
 205
 206         /* compute buffer size in term of "words" as requested in specs */
 207         size = frames_to_bytes(runtime, runtime->buffer_size);
 208         size = (size>>2)-1;
 209         count = snd_pcm_lib_period_bytes(substream);
 210
 211         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 212                 writel(count, priv->io + KIRKWOOD_PLAY_BYTE_INT_COUNT);
 213                 writel(runtime->dma_addr, priv->io + KIRKWOOD_PLAY_BUF_ADDR);
 214                 writel(size, priv->io + KIRKWOOD_PLAY_BUF_SIZE);
 215         } else {
 216                 writel(count, priv->io + KIRKWOOD_REC_BYTE_INT_COUNT);
 217                 writel(runtime->dma_addr, priv->io + KIRKWOOD_REC_BUF_ADDR);
 218                 writel(size, priv->io + KIRKWOOD_REC_BUF_SIZE);
 219         }
 220
 221
 222         return 0;
 223 }
 224
 225 static snd_pcm_uframes_t kirkwood_dma_pointer(struct snd_pcm_substream
 226                                                 *substream)
 227 {
 228         struct kirkwood_dma_data *priv = kirkwood_priv(substream);
 229         snd_pcm_uframes_t count;
 230
 231         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 232                 count = bytes_to_frames(substream->runtime,
 233                         readl(priv->io + KIRKWOOD_PLAY_BYTE_COUNT));
 234         else
 235                 count = bytes_to_frames(substream->runtime,
 236                         readl(priv->io + KIRKWOOD_REC_BYTE_COUNT));
 237
 238         return count;
 239 }
 240
 241 static struct snd_pcm_ops kirkwood_dma_ops = {
 242         .open =         kirkwood_dma_open,
 243         .close =        kirkwood_dma_close,
 244         .ioctl =        snd_pcm_lib_ioctl,
 245         .hw_params =    kirkwood_dma_hw_params,
 246         .hw_free =      kirkwood_dma_hw_free,
 247         .prepare =      kirkwood_dma_prepare,
 248         .pointer =      kirkwood_dma_pointer,
 249 };
 250
 251 static int kirkwood_dma_preallocate_dma_buffer(struct snd_pcm *pcm,
 252                 int stream)
 253 {
 254         struct snd_pcm_substream *substream = pcm->streams[stream].substream;
 255         struct snd_dma_buffer *buf = &substream->dma_buffer;
 256         size_t size = kirkwood_dma_snd_hw.buffer_bytes_max;
 257
 258         buf->dev.type = SNDRV_DMA_TYPE_DEV;
 259         buf->dev.dev = pcm->card->dev;
 260         buf->area = dma_alloc_coherent(pcm->card->dev, size,
 261                         &buf->addr, GFP_KERNEL);
 262         if (!buf->area)
 263                 return -ENOMEM;
 264         buf->bytes = size;
 265         buf->private_data = NULL;
 266
 267         return 0;
 268 }
 269
 270 static int kirkwood_dma_new(struct snd_soc_pcm_runtime *rtd)
 271 {
 272         struct snd_card *card = rtd->card->snd_card;
 273         struct snd_pcm *pcm = rtd->pcm;
 274         int ret;
 275
 276         ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
 277         if (ret)
 278                 return ret;
 279
 280         if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
 281                 ret = kirkwood_dma_preallocate_dma_buffer(pcm,
 282                                 SNDRV_PCM_STREAM_PLAYBACK);
 283                 if (ret)
 284                         return ret;
 285         }
 286
 287         if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
 288                 ret = kirkwood_dma_preallocate_dma_buffer(pcm,
 289                                 SNDRV_PCM_STREAM_CAPTURE);
 290                 if (ret)
 291                         return ret;
 292         }
 293
 294         return 0;
 295 }
 296
 297 static void kirkwood_dma_free_dma_buffers(struct snd_pcm *pcm)
 298 {
 299         struct snd_pcm_substream *substream;
 300         struct snd_dma_buffer *buf;
 301         int stream;
 302
 303         for (stream = 0; stream < 2; stream++) {
 304                 substream = pcm->streams[stream].substream;
 305                 if (!substream)
 306                         continue;
 307                 buf = &substream->dma_buffer;
 308                 if (!buf->area)
 309                         continue;
 310
 311                 dma_free_coherent(pcm->card->dev, buf->bytes,
 312                                 buf->area, buf->addr);
 313                 buf->area = NULL;
 314         }
 315 }
 316
 317 struct snd_soc_platform_driver kirkwood_soc_platform = {
 318         .ops            = &kirkwood_dma_ops,
 319         .pcm_new        = kirkwood_dma_new,
 320         .pcm_free       = kirkwood_dma_free_dma_buffers,
 321 };