drivers/media/pci/tw686x/tw686x-audio.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) 2015 VanguardiaSur - www.vanguardiasur.com.ar
   4  *
   5  * Based on the audio support from the tw6869 driver:
   6  * Copyright 2015 www.starterkit.ru <info@starterkit.ru>
   7  *
   8  * Based on:
   9  * Driver for Intersil|Techwell TW6869 based DVR cards
  10  * (c) 2011-12 liran <jli11@intersil.com> [Intersil|Techwell China]
  11  */
  12
  13 #include <linux/types.h>
  14 #include <linux/kernel.h>
  15 #include <linux/module.h>
  16 #include <linux/init.h>
  17 #include <linux/kmod.h>
  18 #include <linux/mutex.h>
  19 #include <linux/pci.h>
  20 #include <linux/delay.h>
  21
  22 #include <sound/core.h>
  23 #include <sound/initval.h>
  24 #include <sound/pcm.h>
  25 #include <sound/control.h>
  26 #include "tw686x.h"
  27 #include "tw686x-regs.h"
  28
  29 #define AUDIO_CHANNEL_OFFSET 8
  30
  31 void tw686x_audio_irq(struct tw686x_dev *dev, unsigned long requests,
  32                       unsigned int pb_status)
  33 {
  34         unsigned long flags;
  35         unsigned int ch, pb;
  36
  37         for_each_set_bit(ch, &requests, max_channels(dev)) {
  38                 struct tw686x_audio_channel *ac = &dev->audio_channels[ch];
  39                 struct tw686x_audio_buf *done = NULL;
  40                 struct tw686x_audio_buf *next = NULL;
  41                 struct tw686x_dma_desc *desc;
  42
  43                 pb = !!(pb_status & BIT(AUDIO_CHANNEL_OFFSET + ch));
  44
  45                 spin_lock_irqsave(&ac->lock, flags);
  46
  47                 /* Sanity check */
  48                 if (!ac->ss || !ac->curr_bufs[0] || !ac->curr_bufs[1]) {
  49                         spin_unlock_irqrestore(&ac->lock, flags);
  50                         continue;
  51                 }
  52
  53                 if (!list_empty(&ac->buf_list)) {
  54                         next = list_first_entry(&ac->buf_list,
  55                                         struct tw686x_audio_buf, list);
  56                         list_move_tail(&next->list, &ac->buf_list);
  57                         done = ac->curr_bufs[!pb];
  58                         ac->curr_bufs[pb] = next;
  59                 }
  60                 spin_unlock_irqrestore(&ac->lock, flags);
  61
  62                 if (!done || !next)
  63                         continue;
  64                 /*
  65                  * Checking for a non-nil dma_desc[pb]->virt buffer is
  66                  * the same as checking for memcpy DMA mode.
  67                  */
  68                 desc = &ac->dma_descs[pb];
  69                 if (desc->virt) {
  70                         memcpy(done->virt, desc->virt,
  71                                dev->period_size);
  72                 } else {
  73                         u32 reg = pb ? ADMA_B_ADDR[ch] : ADMA_P_ADDR[ch];
  74                         reg_write(dev, reg, next->dma);
  75                 }
  76                 ac->ptr = done->dma - ac->buf[0].dma;
  77                 snd_pcm_period_elapsed(ac->ss);
  78         }
  79 }
  80
  81 /*
  82  * Audio parameters are global and shared among all
  83  * capture channels. The driver prevents changes to
  84  * the parameters if any audio channel is capturing.
  85  */
  86 static const struct snd_pcm_hardware tw686x_capture_hw = {
  87         .info                   = (SNDRV_PCM_INFO_MMAP |
  88                                    SNDRV_PCM_INFO_INTERLEAVED |
  89                                    SNDRV_PCM_INFO_BLOCK_TRANSFER |
  90                                    SNDRV_PCM_INFO_MMAP_VALID),
  91         .formats                = SNDRV_PCM_FMTBIT_S16_LE,
  92         .rates                  = SNDRV_PCM_RATE_8000_48000,
  93         .rate_min               = 8000,
  94         .rate_max               = 48000,
  95         .channels_min           = 1,
  96         .channels_max           = 1,
  97         .buffer_bytes_max       = TW686X_AUDIO_PAGE_MAX * AUDIO_DMA_SIZE_MAX,
  98         .period_bytes_min       = AUDIO_DMA_SIZE_MIN,
  99         .period_bytes_max       = AUDIO_DMA_SIZE_MAX,
 100         .periods_min            = TW686X_AUDIO_PERIODS_MIN,
 101         .periods_max            = TW686X_AUDIO_PERIODS_MAX,
 102 };
 103
 104 static int tw686x_pcm_open(struct snd_pcm_substream *ss)
 105 {
 106         struct tw686x_dev *dev = snd_pcm_substream_chip(ss);
 107         struct tw686x_audio_channel *ac = &dev->audio_channels[ss->number];
 108         struct snd_pcm_runtime *rt = ss->runtime;
 109         int err;
 110
 111         ac->ss = ss;
 112         rt->hw = tw686x_capture_hw;
 113
 114         err = snd_pcm_hw_constraint_integer(rt, SNDRV_PCM_HW_PARAM_PERIODS);
 115         if (err < 0)
 116                 return err;
 117
 118         return 0;
 119 }
 120
 121 static int tw686x_pcm_close(struct snd_pcm_substream *ss)
 122 {
 123         struct tw686x_dev *dev = snd_pcm_substream_chip(ss);
 124         struct tw686x_audio_channel *ac = &dev->audio_channels[ss->number];
 125
 126         ac->ss = NULL;
 127         return 0;
 128 }
 129
 130 static int tw686x_pcm_prepare(struct snd_pcm_substream *ss)
 131 {
 132         struct tw686x_dev *dev = snd_pcm_substream_chip(ss);
 133         struct tw686x_audio_channel *ac = &dev->audio_channels[ss->number];
 134         struct snd_pcm_runtime *rt = ss->runtime;
 135         unsigned int period_size = snd_pcm_lib_period_bytes(ss);
 136         struct tw686x_audio_buf *p_buf, *b_buf;
 137         unsigned long flags;
 138         int i;
 139
 140         spin_lock_irqsave(&dev->lock, flags);
 141         /*
 142          * Given the audio parameters are global (i.e. shared across
 143          * DMA channels), we need to check new params are allowed.
 144          */
 145         if (((dev->audio_rate != rt->rate) ||
 146              (dev->period_size != period_size)) && dev->audio_enabled)
 147                 goto err_audio_busy;
 148
 149         tw686x_disable_channel(dev, AUDIO_CHANNEL_OFFSET + ac->ch);
 150         spin_unlock_irqrestore(&dev->lock, flags);
 151
 152         if (dev->audio_rate != rt->rate) {
 153                 u32 reg;
 154
 155                 dev->audio_rate = rt->rate;
 156                 reg = ((125000000 / rt->rate) << 16) +
 157                        ((125000000 % rt->rate) << 16) / rt->rate;
 158
 159                 reg_write(dev, AUDIO_CONTROL2, reg);
 160         }
 161
 162         if (dev->period_size != period_size) {
 163                 u32 reg;
 164
 165                 dev->period_size = period_size;
 166                 reg = reg_read(dev, AUDIO_CONTROL1);
 167                 reg &= ~(AUDIO_DMA_SIZE_MASK << AUDIO_DMA_SIZE_SHIFT);
 168                 reg |= period_size << AUDIO_DMA_SIZE_SHIFT;
 169
 170                 reg_write(dev, AUDIO_CONTROL1, reg);
 171         }
 172
 173         if (rt->periods < TW686X_AUDIO_PERIODS_MIN ||
 174             rt->periods > TW686X_AUDIO_PERIODS_MAX)
 175                 return -EINVAL;
 176
 177         spin_lock_irqsave(&ac->lock, flags);
 178         INIT_LIST_HEAD(&ac->buf_list);
 179
 180         for (i = 0; i < rt->periods; i++) {
 181                 ac->buf[i].dma = rt->dma_addr + period_size * i;
 182                 ac->buf[i].virt = rt->dma_area + period_size * i;
 183                 INIT_LIST_HEAD(&ac->buf[i].list);
 184                 list_add_tail(&ac->buf[i].list, &ac->buf_list);
 185         }
 186
 187         p_buf = list_first_entry(&ac->buf_list, struct tw686x_audio_buf, list);
 188         list_move_tail(&p_buf->list, &ac->buf_list);
 189
 190         b_buf = list_first_entry(&ac->buf_list, struct tw686x_audio_buf, list);
 191         list_move_tail(&b_buf->list, &ac->buf_list);
 192
 193         ac->curr_bufs[0] = p_buf;
 194         ac->curr_bufs[1] = b_buf;
 195         ac->ptr = 0;
 196
 197         if (dev->dma_mode != TW686X_DMA_MODE_MEMCPY) {
 198                 reg_write(dev, ADMA_P_ADDR[ac->ch], p_buf->dma);
 199                 reg_write(dev, ADMA_B_ADDR[ac->ch], b_buf->dma);
 200         }
 201
 202         spin_unlock_irqrestore(&ac->lock, flags);
 203
 204         return 0;
 205
 206 err_audio_busy:
 207         spin_unlock_irqrestore(&dev->lock, flags);
 208         return -EBUSY;
 209 }
 210
 211 static int tw686x_pcm_trigger(struct snd_pcm_substream *ss, int cmd)
 212 {
 213         struct tw686x_dev *dev = snd_pcm_substream_chip(ss);
 214         struct tw686x_audio_channel *ac = &dev->audio_channels[ss->number];
 215         unsigned long flags;
 216         int err = 0;
 217
 218         switch (cmd) {
 219         case SNDRV_PCM_TRIGGER_START:
 220                 if (ac->curr_bufs[0] && ac->curr_bufs[1]) {
 221                         spin_lock_irqsave(&dev->lock, flags);
 222                         dev->audio_enabled = 1;
 223                         tw686x_enable_channel(dev,
 224                                 AUDIO_CHANNEL_OFFSET + ac->ch);
 225                         spin_unlock_irqrestore(&dev->lock, flags);
 226
 227                         mod_timer(&dev->dma_delay_timer,
 228                                   jiffies + msecs_to_jiffies(100));
 229                 } else {
 230                         err = -EIO;
 231                 }
 232                 break;
 233         case SNDRV_PCM_TRIGGER_STOP:
 234                 spin_lock_irqsave(&dev->lock, flags);
 235                 dev->audio_enabled = 0;
 236                 tw686x_disable_channel(dev, AUDIO_CHANNEL_OFFSET + ac->ch);
 237                 spin_unlock_irqrestore(&dev->lock, flags);
 238
 239                 spin_lock_irqsave(&ac->lock, flags);
 240                 ac->curr_bufs[0] = NULL;
 241                 ac->curr_bufs[1] = NULL;
 242                 spin_unlock_irqrestore(&ac->lock, flags);
 243                 break;
 244         default:
 245                 err = -EINVAL;
 246         }
 247         return err;
 248 }
 249
 250 static snd_pcm_uframes_t tw686x_pcm_pointer(struct snd_pcm_substream *ss)
 251 {
 252         struct tw686x_dev *dev = snd_pcm_substream_chip(ss);
 253         struct tw686x_audio_channel *ac = &dev->audio_channels[ss->number];
 254
 255         return bytes_to_frames(ss->runtime, ac->ptr);
 256 }
 257
 258 static const struct snd_pcm_ops tw686x_pcm_ops = {
 259         .open = tw686x_pcm_open,
 260         .close = tw686x_pcm_close,
 261         .prepare = tw686x_pcm_prepare,
 262         .trigger = tw686x_pcm_trigger,
 263         .pointer = tw686x_pcm_pointer,
 264 };
 265
 266 static int tw686x_snd_pcm_init(struct tw686x_dev *dev)
 267 {
 268         struct snd_card *card = dev->snd_card;
 269         struct snd_pcm *pcm;
 270         struct snd_pcm_substream *ss;
 271         unsigned int i;
 272         int err;
 273
 274         err = snd_pcm_new(card, card->driver, 0, 0, max_channels(dev), &pcm);
 275         if (err < 0)
 276                 return err;
 277
 278         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &tw686x_pcm_ops);
 279         snd_pcm_chip(pcm) = dev;
 280         pcm->info_flags = 0;
 281         strscpy(pcm->name, "tw686x PCM", sizeof(pcm->name));
 282
 283         for (i = 0, ss = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream;
 284              ss; ss = ss->next, i++)
 285                 snprintf(ss->name, sizeof(ss->name), "vch%u audio", i);
 286
 287         snd_pcm_set_managed_buffer_all(pcm,
 288                                 SNDRV_DMA_TYPE_DEV,
 289                                 &dev->pci_dev->dev,
 290                                 TW686X_AUDIO_PAGE_MAX * AUDIO_DMA_SIZE_MAX,
 291                                 TW686X_AUDIO_PAGE_MAX * AUDIO_DMA_SIZE_MAX);
 292         return 0;
 293 }
 294
 295 static void tw686x_audio_dma_free(struct tw686x_dev *dev,
 296                                   struct tw686x_audio_channel *ac)
 297 {
 298         int pb;
 299
 300         for (pb = 0; pb < 2; pb++) {
 301                 if (!ac->dma_descs[pb].virt)
 302                         continue;
 303                 dma_free_coherent(&dev->pci_dev->dev, ac->dma_descs[pb].size,
 304                                   ac->dma_descs[pb].virt,
 305                                   ac->dma_descs[pb].phys);
 306                 ac->dma_descs[pb].virt = NULL;
 307         }
 308 }
 309
 310 static int tw686x_audio_dma_alloc(struct tw686x_dev *dev,
 311                                   struct tw686x_audio_channel *ac)
 312 {
 313         int pb;
 314
 315         /*
 316          * In the memcpy DMA mode we allocate a coherent buffer
 317          * and use it for the DMA capture. Otherwise, DMA
 318          * acts on the ALSA buffers as received in pcm_prepare.
 319          */
 320         if (dev->dma_mode != TW686X_DMA_MODE_MEMCPY)
 321                 return 0;
 322
 323         for (pb = 0; pb < 2; pb++) {
 324                 u32 reg = pb ? ADMA_B_ADDR[ac->ch] : ADMA_P_ADDR[ac->ch];
 325                 void *virt;
 326
 327                 virt = dma_alloc_coherent(&dev->pci_dev->dev,
 328                                           AUDIO_DMA_SIZE_MAX,
 329                                           &ac->dma_descs[pb].phys, GFP_KERNEL);
 330                 if (!virt) {
 331                         dev_err(&dev->pci_dev->dev,
 332                                 "dma%d: unable to allocate audio DMA %s-buffer\n",
 333                                 ac->ch, pb ? "B" : "P");
 334                         return -ENOMEM;
 335                 }
 336                 ac->dma_descs[pb].virt = virt;
 337                 ac->dma_descs[pb].size = AUDIO_DMA_SIZE_MAX;
 338                 reg_write(dev, reg, ac->dma_descs[pb].phys);
 339         }
 340         return 0;
 341 }
 342
 343 void tw686x_audio_free(struct tw686x_dev *dev)
 344 {
 345         unsigned long flags;
 346         u32 dma_ch_mask;
 347         u32 dma_cmd;
 348
 349         spin_lock_irqsave(&dev->lock, flags);
 350         dma_cmd = reg_read(dev, DMA_CMD);
 351         dma_ch_mask = reg_read(dev, DMA_CHANNEL_ENABLE);
 352         reg_write(dev, DMA_CMD, dma_cmd & ~0xff00);
 353         reg_write(dev, DMA_CHANNEL_ENABLE, dma_ch_mask & ~0xff00);
 354         spin_unlock_irqrestore(&dev->lock, flags);
 355
 356         if (!dev->snd_card)
 357                 return;
 358         snd_card_free(dev->snd_card);
 359         dev->snd_card = NULL;
 360 }
 361
 362 int tw686x_audio_init(struct tw686x_dev *dev)
 363 {
 364         struct pci_dev *pci_dev = dev->pci_dev;
 365         struct snd_card *card;
 366         int err, ch;
 367
 368         /* Enable external audio */
 369         reg_write(dev, AUDIO_CONTROL1, BIT(0));
 370
 371         err = snd_card_new(&pci_dev->dev, SNDRV_DEFAULT_IDX1,
 372                            SNDRV_DEFAULT_STR1,
 373                            THIS_MODULE, 0, &card);
 374         if (err < 0)
 375                 return err;
 376
 377         dev->snd_card = card;
 378         strscpy(card->driver, "tw686x", sizeof(card->driver));
 379         strscpy(card->shortname, "tw686x", sizeof(card->shortname));
 380         strscpy(card->longname, pci_name(pci_dev), sizeof(card->longname));
 381         snd_card_set_dev(card, &pci_dev->dev);
 382
 383         for (ch = 0; ch < max_channels(dev); ch++) {
 384                 struct tw686x_audio_channel *ac;
 385
 386                 ac = &dev->audio_channels[ch];
 387                 spin_lock_init(&ac->lock);
 388                 ac->dev = dev;
 389                 ac->ch = ch;
 390
 391                 err = tw686x_audio_dma_alloc(dev, ac);
 392                 if (err < 0)
 393                         goto err_cleanup;
 394         }
 395
 396         err = tw686x_snd_pcm_init(dev);
 397         if (err < 0)
 398                 goto err_cleanup;
 399
 400         err = snd_card_register(card);
 401         if (!err)
 402                 return 0;
 403
 404 err_cleanup:
 405         for (ch = 0; ch < max_channels(dev); ch++) {
 406                 if (!dev->audio_channels[ch].dev)
 407                         continue;
 408                 tw686x_audio_dma_free(dev, &dev->audio_channels[ch]);
 409         }
 410         snd_card_free(card);
 411         dev->snd_card = NULL;
 412         return err;
 413 }