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(snd_soc_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
 108         snd_soc_set_runtime_hwparams(substream, &kirkwood_dma_snd_hw);
 109
 110         /* Ensure that all constraints linked to dma burst are fulfilled */
 111         err = snd_pcm_hw_constraint_minmax(runtime,
 112                         SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
 113                         priv->burst * 2,
 114                         KIRKWOOD_AUDIO_BUF_MAX-1);
 115         if (err < 0)
 116                 return err;
 117
 118         err = snd_pcm_hw_constraint_step(runtime, 0,
 119                         SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
 120                         priv->burst);
 121         if (err < 0)
 122                 return err;
 123
 124         err = snd_pcm_hw_constraint_step(substream->runtime, 0,
 125                          SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
 126                          priv->burst);
 127         if (err < 0)
 128                 return err;
 129
 130         if (!priv->substream_play && !priv->substream_rec) {
 131                 err = request_irq(priv->irq, kirkwood_dma_irq, IRQF_SHARED,
 132                                   "kirkwood-i2s", priv);
 133                 if (err)
 134                         return err;
 135
 136                 /*
 137                  * Enable Error interrupts. We're only ack'ing them but
 138                  * it's useful for diagnostics
 139                  */
 140                 writel((unsigned int)-1, priv->io + KIRKWOOD_ERR_MASK);
 141         }
 142
 143         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 144                 if (priv->substream_play)
 145                         return -EBUSY;
 146                 priv->substream_play = substream;
 147         } else {
 148                 if (priv->substream_rec)
 149                         return -EBUSY;
 150                 priv->substream_rec = substream;
 151         }
 152
 153         return 0;
 154 }
 155
 156 static int kirkwood_dma_close(struct snd_soc_component *component,
 157                               struct snd_pcm_substream *substream)
 158 {
 159         struct kirkwood_dma_data *priv = kirkwood_priv(substream);
 160
 161         if (!priv)
 162                 return 0;
 163
 164         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 165                 priv->substream_play = NULL;
 166         else
 167                 priv->substream_rec = NULL;
 168
 169         if (!priv->substream_play && !priv->substream_rec) {
 170                 writel(0, priv->io + KIRKWOOD_ERR_MASK);
 171                 free_irq(priv->irq, priv);
 172         }
 173
 174         return 0;
 175 }
 176
 177 static int kirkwood_dma_hw_params(struct snd_soc_component *component,
 178                                   struct snd_pcm_substream *substream,
 179                                   struct snd_pcm_hw_params *params)
 180 {
 181         struct kirkwood_dma_data *priv = kirkwood_priv(substream);
 182         const struct mbus_dram_target_info *dram = mv_mbus_dram_info();
 183         unsigned long addr = substream->runtime->dma_addr;
 184
 185         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 186                 kirkwood_dma_conf_mbus_windows(priv->io,
 187                         KIRKWOOD_PLAYBACK_WIN, addr, dram);
 188         else
 189                 kirkwood_dma_conf_mbus_windows(priv->io,
 190                         KIRKWOOD_RECORD_WIN, addr, dram);
 191         return 0;
 192 }
 193
 194 static int kirkwood_dma_prepare(struct snd_soc_component *component,
 195                                 struct snd_pcm_substream *substream)
 196 {
 197         struct snd_pcm_runtime *runtime = substream->runtime;
 198         struct kirkwood_dma_data *priv = kirkwood_priv(substream);
 199         unsigned long size, count;
 200
 201         /* compute buffer size in term of "words" as requested in specs */
 202         size = frames_to_bytes(runtime, runtime->buffer_size);
 203         size = (size>>2)-1;
 204         count = snd_pcm_lib_period_bytes(substream);
 205
 206         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 207                 writel(count, priv->io + KIRKWOOD_PLAY_BYTE_INT_COUNT);
 208                 writel(runtime->dma_addr, priv->io + KIRKWOOD_PLAY_BUF_ADDR);
 209                 writel(size, priv->io + KIRKWOOD_PLAY_BUF_SIZE);
 210         } else {
 211                 writel(count, priv->io + KIRKWOOD_REC_BYTE_INT_COUNT);
 212                 writel(runtime->dma_addr, priv->io + KIRKWOOD_REC_BUF_ADDR);
 213                 writel(size, priv->io + KIRKWOOD_REC_BUF_SIZE);
 214         }
 215
 216
 217         return 0;
 218 }
 219
 220 static snd_pcm_uframes_t kirkwood_dma_pointer(
 221         struct snd_soc_component *component,
 222         struct snd_pcm_substream *substream)
 223 {
 224         struct kirkwood_dma_data *priv = kirkwood_priv(substream);
 225         snd_pcm_uframes_t count;
 226
 227         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 228                 count = bytes_to_frames(substream->runtime,
 229                         readl(priv->io + KIRKWOOD_PLAY_BYTE_COUNT));
 230         else
 231                 count = bytes_to_frames(substream->runtime,
 232                         readl(priv->io + KIRKWOOD_REC_BYTE_COUNT));
 233
 234         return count;
 235 }
 236
 237 static int kirkwood_dma_new(struct snd_soc_component *component,
 238                             struct snd_soc_pcm_runtime *rtd)
 239 {
 240         size_t size = kirkwood_dma_snd_hw.buffer_bytes_max;
 241         struct snd_card *card = rtd->card->snd_card;
 242         int ret;
 243
 244         ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
 245         if (ret)
 246                 return ret;
 247
 248         snd_pcm_set_managed_buffer_all(rtd->pcm, SNDRV_DMA_TYPE_DEV,
 249                                        card->dev, size, size);
 250
 251         return 0;
 252 }
 253
 254 const struct snd_soc_component_driver kirkwood_soc_component = {
 255         .name           = DRV_NAME,
 256         .open           = kirkwood_dma_open,
 257         .close          = kirkwood_dma_close,
 258         .hw_params      = kirkwood_dma_hw_params,
 259         .prepare        = kirkwood_dma_prepare,
 260         .pointer        = kirkwood_dma_pointer,
 261         .pcm_construct  = kirkwood_dma_new,
 262 };