sound/soc/kirkwood/kirkwood-dma.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * kirkwood-dma.c
   4  *
   5  * (c) 2010 Arnaud Patard <apatard@mandriva.com>
   6  * (c) 2010 Arnaud Patard <arnaud.patard@rtp-net.org>
   7  */
   8
   9 #include <linux/init.h>
  10 #include <linux/module.h>
  11 #include <linux/device.h>
  12 #include <linux/io.h>
  13 #include <linux/slab.h>
  14 #include <linux/interrupt.h>
  15 #include <linux/dma-mapping.h>
  16 #include <linux/mbus.h>
  17 #include <sound/soc.h>
  18 #include "kirkwood.h"
  19
  20 static struct kirkwood_dma_data *kirkwood_priv(struct snd_pcm_substream *subs)
  21 {
  22         struct snd_soc_pcm_runtime *soc_runtime = subs->private_data;
  23         return snd_soc_dai_get_drvdata(soc_runtime->cpu_dai);
  24 }
  25
  26 static const struct snd_pcm_hardware kirkwood_dma_snd_hw = {
  27         .info = SNDRV_PCM_INFO_INTERLEAVED |
  28                 SNDRV_PCM_INFO_MMAP |
  29                 SNDRV_PCM_INFO_MMAP_VALID |
  30                 SNDRV_PCM_INFO_BLOCK_TRANSFER |
  31                 SNDRV_PCM_INFO_PAUSE |
  32                 SNDRV_PCM_INFO_NO_PERIOD_WAKEUP,
  33         .buffer_bytes_max       = KIRKWOOD_SND_MAX_BUFFER_BYTES,
  34         .period_bytes_min       = KIRKWOOD_SND_MIN_PERIOD_BYTES,
  35         .period_bytes_max       = KIRKWOOD_SND_MAX_PERIOD_BYTES,
  36         .periods_min            = KIRKWOOD_SND_MIN_PERIODS,
  37         .periods_max            = KIRKWOOD_SND_MAX_PERIODS,
  38         .fifo_size              = 0,
  39 };
  40
  41 static irqreturn_t kirkwood_dma_irq(int irq, void *dev_id)
  42 {
  43         struct kirkwood_dma_data *priv = dev_id;
  44         unsigned long mask, status, cause;
  45
  46         mask = readl(priv->io + KIRKWOOD_INT_MASK);
  47         status = readl(priv->io + KIRKWOOD_INT_CAUSE) & mask;
  48
  49         cause = readl(priv->io + KIRKWOOD_ERR_CAUSE);
  50         if (unlikely(cause)) {
  51                 printk(KERN_WARNING "%s: got err interrupt 0x%lx\n",
  52                                 __func__, cause);
  53                 writel(cause, priv->io + KIRKWOOD_ERR_CAUSE);
  54         }
  55
  56         /* we've enabled only bytes interrupts ... */
  57         if (status & ~(KIRKWOOD_INT_CAUSE_PLAY_BYTES | \
  58                         KIRKWOOD_INT_CAUSE_REC_BYTES)) {
  59                 printk(KERN_WARNING "%s: unexpected interrupt %lx\n",
  60                         __func__, status);
  61                 return IRQ_NONE;
  62         }
  63
  64         /* ack int */
  65         writel(status, priv->io + KIRKWOOD_INT_CAUSE);
  66
  67         if (status & KIRKWOOD_INT_CAUSE_PLAY_BYTES)
  68                 snd_pcm_period_elapsed(priv->substream_play);
  69
  70         if (status & KIRKWOOD_INT_CAUSE_REC_BYTES)
  71                 snd_pcm_period_elapsed(priv->substream_rec);
  72
  73         return IRQ_HANDLED;
  74 }
  75
  76 static void
  77 kirkwood_dma_conf_mbus_windows(void __iomem *base, int win,
  78                                unsigned long dma,
  79                                const struct mbus_dram_target_info *dram)
  80 {
  81         int i;
  82
  83         /* First disable and clear windows */
  84         writel(0, base + KIRKWOOD_AUDIO_WIN_CTRL_REG(win));
  85         writel(0, base + KIRKWOOD_AUDIO_WIN_BASE_REG(win));
  86
  87         /* try to find matching cs for current dma address */
  88         for (i = 0; i < dram->num_cs; i++) {
  89                 const struct mbus_dram_window *cs = dram->cs + i;
  90                 if ((cs->base & 0xffff0000) < (dma & 0xffff0000)) {
  91                         writel(cs->base & 0xffff0000,
  92                                 base + KIRKWOOD_AUDIO_WIN_BASE_REG(win));
  93                         writel(((cs->size - 1) & 0xffff0000) |
  94                                 (cs->mbus_attr << 8) |
  95                                 (dram->mbus_dram_target_id << 4) | 1,
  96                                 base + KIRKWOOD_AUDIO_WIN_CTRL_REG(win));
  97                 }
  98         }
  99 }
 100
 101 static int kirkwood_dma_open(struct snd_soc_component *component,
 102                              struct snd_pcm_substream *substream)
 103 {
 104         int err;
 105         struct snd_pcm_runtime *runtime = substream->runtime;
 106         struct kirkwood_dma_data *priv = kirkwood_priv(substream);
 107         const struct mbus_dram_target_info *dram;
 108         unsigned long addr;
 109
 110         snd_soc_set_runtime_hwparams(substream, &kirkwood_dma_snd_hw);
 111
 112         /* Ensure that all constraints linked to dma burst are fulfilled */
 113         err = snd_pcm_hw_constraint_minmax(runtime,
 114                         SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
 115                         priv->burst * 2,
 116                         KIRKWOOD_AUDIO_BUF_MAX-1);
 117         if (err < 0)
 118                 return err;
 119
 120         err = snd_pcm_hw_constraint_step(runtime, 0,
 121                         SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
 122                         priv->burst);
 123         if (err < 0)
 124                 return err;
 125
 126         err = snd_pcm_hw_constraint_step(substream->runtime, 0,
 127                          SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
 128                          priv->burst);
 129         if (err < 0)
 130                 return err;
 131
 132         if (!priv->substream_play && !priv->substream_rec) {
 133                 err = request_irq(priv->irq, kirkwood_dma_irq, IRQF_SHARED,
 134                                   "kirkwood-i2s", priv);
 135                 if (err)
 136                         return err;
 137
 138                 /*
 139                  * Enable Error interrupts. We're only ack'ing them but
 140                  * it's useful for diagnostics
 141                  */
 142                 writel((unsigned int)-1, priv->io + KIRKWOOD_ERR_MASK);
 143         }
 144
 145         dram = mv_mbus_dram_info();
 146         addr = substream->dma_buffer.addr;
 147         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 148                 if (priv->substream_play)
 149                         return -EBUSY;
 150                 priv->substream_play = substream;
 151                 kirkwood_dma_conf_mbus_windows(priv->io,
 152                         KIRKWOOD_PLAYBACK_WIN, addr, dram);
 153         } else {
 154                 if (priv->substream_rec)
 155                         return -EBUSY;
 156                 priv->substream_rec = substream;
 157                 kirkwood_dma_conf_mbus_windows(priv->io,
 158                         KIRKWOOD_RECORD_WIN, addr, dram);
 159         }
 160
 161         return 0;
 162 }
 163
 164 static int kirkwood_dma_close(struct snd_soc_component *component,
 165                               struct snd_pcm_substream *substream)
 166 {
 167         struct kirkwood_dma_data *priv = kirkwood_priv(substream);
 168
 169         if (!priv)
 170                 return 0;
 171
 172         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 173                 priv->substream_play = NULL;
 174         else
 175                 priv->substream_rec = NULL;
 176
 177         if (!priv->substream_play && !priv->substream_rec) {
 178                 writel(0, priv->io + KIRKWOOD_ERR_MASK);
 179                 free_irq(priv->irq, priv);
 180         }
 181
 182         return 0;
 183 }
 184
 185 static int kirkwood_dma_hw_params(struct snd_soc_component *component,
 186                                   struct snd_pcm_substream *substream,
 187                                   struct snd_pcm_hw_params *params)
 188 {
 189         struct snd_pcm_runtime *runtime = substream->runtime;
 190
 191         snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
 192         runtime->dma_bytes = params_buffer_bytes(params);
 193
 194         return 0;
 195 }
 196
 197 static int kirkwood_dma_hw_free(struct snd_soc_component *component,
 198                                 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_soc_component *component,
 205                                 struct snd_pcm_substream *substream)
 206 {
 207         struct snd_pcm_runtime *runtime = substream->runtime;
 208         struct kirkwood_dma_data *priv = kirkwood_priv(substream);
 209         unsigned long size, count;
 210
 211         /* compute buffer size in term of "words" as requested in specs */
 212         size = frames_to_bytes(runtime, runtime->buffer_size);
 213         size = (size>>2)-1;
 214         count = snd_pcm_lib_period_bytes(substream);
 215
 216         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 217                 writel(count, priv->io + KIRKWOOD_PLAY_BYTE_INT_COUNT);
 218                 writel(runtime->dma_addr, priv->io + KIRKWOOD_PLAY_BUF_ADDR);
 219                 writel(size, priv->io + KIRKWOOD_PLAY_BUF_SIZE);
 220         } else {
 221                 writel(count, priv->io + KIRKWOOD_REC_BYTE_INT_COUNT);
 222                 writel(runtime->dma_addr, priv->io + KIRKWOOD_REC_BUF_ADDR);
 223                 writel(size, priv->io + KIRKWOOD_REC_BUF_SIZE);
 224         }
 225
 226
 227         return 0;
 228 }
 229
 230 static snd_pcm_uframes_t kirkwood_dma_pointer(
 231         struct snd_soc_component *component,
 232         struct snd_pcm_substream *substream)
 233 {
 234         struct kirkwood_dma_data *priv = kirkwood_priv(substream);
 235         snd_pcm_uframes_t count;
 236
 237         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 238                 count = bytes_to_frames(substream->runtime,
 239                         readl(priv->io + KIRKWOOD_PLAY_BYTE_COUNT));
 240         else
 241                 count = bytes_to_frames(substream->runtime,
 242                         readl(priv->io + KIRKWOOD_REC_BYTE_COUNT));
 243
 244         return count;
 245 }
 246
 247 static int kirkwood_dma_preallocate_dma_buffer(struct snd_pcm *pcm,
 248                 int stream)
 249 {
 250         struct snd_pcm_substream *substream = pcm->streams[stream].substream;
 251         struct snd_dma_buffer *buf = &substream->dma_buffer;
 252         size_t size = kirkwood_dma_snd_hw.buffer_bytes_max;
 253
 254         buf->dev.type = SNDRV_DMA_TYPE_DEV;
 255         buf->dev.dev = pcm->card->dev;
 256         buf->area = dma_alloc_coherent(pcm->card->dev, size,
 257                         &buf->addr, GFP_KERNEL);
 258         if (!buf->area)
 259                 return -ENOMEM;
 260         buf->bytes = size;
 261         buf->private_data = NULL;
 262
 263         return 0;
 264 }
 265
 266 static int kirkwood_dma_new(struct snd_soc_component *component,
 267                             struct snd_soc_pcm_runtime *rtd)
 268 {
 269         struct snd_card *card = rtd->card->snd_card;
 270         struct snd_pcm *pcm = rtd->pcm;
 271         int ret;
 272
 273         ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
 274         if (ret)
 275                 return ret;
 276
 277         if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
 278                 ret = kirkwood_dma_preallocate_dma_buffer(pcm,
 279                                 SNDRV_PCM_STREAM_PLAYBACK);
 280                 if (ret)
 281                         return ret;
 282         }
 283
 284         if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
 285                 ret = kirkwood_dma_preallocate_dma_buffer(pcm,
 286                                 SNDRV_PCM_STREAM_CAPTURE);
 287                 if (ret)
 288                         return ret;
 289         }
 290
 291         return 0;
 292 }
 293
 294 static void kirkwood_dma_free_dma_buffers(struct snd_soc_component *component,
 295                                           struct snd_pcm *pcm)
 296 {
 297         struct snd_pcm_substream *substream;
 298         struct snd_dma_buffer *buf;
 299         int stream;
 300
 301         for (stream = 0; stream < 2; stream++) {
 302                 substream = pcm->streams[stream].substream;
 303                 if (!substream)
 304                         continue;
 305                 buf = &substream->dma_buffer;
 306                 if (!buf->area)
 307                         continue;
 308
 309                 dma_free_coherent(pcm->card->dev, buf->bytes,
 310                                 buf->area, buf->addr);
 311                 buf->area = NULL;
 312         }
 313 }
 314
 315 const struct snd_soc_component_driver kirkwood_soc_component = {
 316         .name           = DRV_NAME,
 317         .open           = kirkwood_dma_open,
 318         .close          = kirkwood_dma_close,
 319         .hw_params      = kirkwood_dma_hw_params,
 320         .hw_free        = kirkwood_dma_hw_free,
 321         .prepare        = kirkwood_dma_prepare,
 322         .pointer        = kirkwood_dma_pointer,
 323         .pcm_construct  = kirkwood_dma_new,
 324         .pcm_destruct   = kirkwood_dma_free_dma_buffers,
 325 };