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(asoc_rtd_to_cpu(soc_runtime, 0));
  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_prepare(struct snd_soc_component *component,
 186                                 struct snd_pcm_substream *substream)
 187 {
 188         struct snd_pcm_runtime *runtime = substream->runtime;
 189         struct kirkwood_dma_data *priv = kirkwood_priv(substream);
 190         unsigned long size, count;
 191
 192         /* compute buffer size in term of "words" as requested in specs */
 193         size = frames_to_bytes(runtime, runtime->buffer_size);
 194         size = (size>>2)-1;
 195         count = snd_pcm_lib_period_bytes(substream);
 196
 197         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 198                 writel(count, priv->io + KIRKWOOD_PLAY_BYTE_INT_COUNT);
 199                 writel(runtime->dma_addr, priv->io + KIRKWOOD_PLAY_BUF_ADDR);
 200                 writel(size, priv->io + KIRKWOOD_PLAY_BUF_SIZE);
 201         } else {
 202                 writel(count, priv->io + KIRKWOOD_REC_BYTE_INT_COUNT);
 203                 writel(runtime->dma_addr, priv->io + KIRKWOOD_REC_BUF_ADDR);
 204                 writel(size, priv->io + KIRKWOOD_REC_BUF_SIZE);
 205         }
 206
 207
 208         return 0;
 209 }
 210
 211 static snd_pcm_uframes_t kirkwood_dma_pointer(
 212         struct snd_soc_component *component,
 213         struct snd_pcm_substream *substream)
 214 {
 215         struct kirkwood_dma_data *priv = kirkwood_priv(substream);
 216         snd_pcm_uframes_t count;
 217
 218         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 219                 count = bytes_to_frames(substream->runtime,
 220                         readl(priv->io + KIRKWOOD_PLAY_BYTE_COUNT));
 221         else
 222                 count = bytes_to_frames(substream->runtime,
 223                         readl(priv->io + KIRKWOOD_REC_BYTE_COUNT));
 224
 225         return count;
 226 }
 227
 228 static int kirkwood_dma_new(struct snd_soc_component *component,
 229                             struct snd_soc_pcm_runtime *rtd)
 230 {
 231         size_t size = kirkwood_dma_snd_hw.buffer_bytes_max;
 232         struct snd_card *card = rtd->card->snd_card;
 233         int ret;
 234
 235         ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
 236         if (ret)
 237                 return ret;
 238
 239         snd_pcm_set_managed_buffer_all(rtd->pcm, SNDRV_DMA_TYPE_DEV,
 240                                        card->dev, size, size);
 241
 242         return 0;
 243 }
 244
 245 const struct snd_soc_component_driver kirkwood_soc_component = {
 246         .name           = DRV_NAME,
 247         .open           = kirkwood_dma_open,
 248         .close          = kirkwood_dma_close,
 249         .prepare        = kirkwood_dma_prepare,
 250         .pointer        = kirkwood_dma_pointer,
 251         .pcm_construct  = kirkwood_dma_new,
 252 };