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