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 static int tw686x_pcm_hw_params(struct snd_pcm_substream *ss,
  82                                 struct snd_pcm_hw_params *hw_params)
  83 {
  84         return snd_pcm_lib_malloc_pages(ss, params_buffer_bytes(hw_params));
  85 }
  86
  87 static int tw686x_pcm_hw_free(struct snd_pcm_substream *ss)
  88 {
  89         return snd_pcm_lib_free_pages(ss);
  90 }
  91
  92 /*
  93  * Audio parameters are global and shared among all
  94  * capture channels. The driver prevents changes to
  95  * the parameters if any audio channel is capturing.
  96  */
  97 static const struct snd_pcm_hardware tw686x_capture_hw = {
  98         .info                   = (SNDRV_PCM_INFO_MMAP |
  99                                    SNDRV_PCM_INFO_INTERLEAVED |
 100                                    SNDRV_PCM_INFO_BLOCK_TRANSFER |
 101                                    SNDRV_PCM_INFO_MMAP_VALID),
 102         .formats                = SNDRV_PCM_FMTBIT_S16_LE,
 103         .rates                  = SNDRV_PCM_RATE_8000_48000,
 104         .rate_min               = 8000,
 105         .rate_max               = 48000,
 106         .channels_min           = 1,
 107         .channels_max           = 1,
 108         .buffer_bytes_max       = TW686X_AUDIO_PAGE_MAX * AUDIO_DMA_SIZE_MAX,
 109         .period_bytes_min       = AUDIO_DMA_SIZE_MIN,
 110         .period_bytes_max       = AUDIO_DMA_SIZE_MAX,
 111         .periods_min            = TW686X_AUDIO_PERIODS_MIN,
 112         .periods_max            = TW686X_AUDIO_PERIODS_MAX,
 113 };
 114
 115 static int tw686x_pcm_open(struct snd_pcm_substream *ss)
 116 {
 117         struct tw686x_dev *dev = snd_pcm_substream_chip(ss);
 118         struct tw686x_audio_channel *ac = &dev->audio_channels[ss->number];
 119         struct snd_pcm_runtime *rt = ss->runtime;
 120         int err;
 121
 122         ac->ss = ss;
 123         rt->hw = tw686x_capture_hw;
 124
 125         err = snd_pcm_hw_constraint_integer(rt, SNDRV_PCM_HW_PARAM_PERIODS);
 126         if (err < 0)
 127                 return err;
 128
 129         return 0;
 130 }
 131
 132 static int tw686x_pcm_close(struct snd_pcm_substream *ss)
 133 {
 134         struct tw686x_dev *dev = snd_pcm_substream_chip(ss);
 135         struct tw686x_audio_channel *ac = &dev->audio_channels[ss->number];
 136
 137         ac->ss = NULL;
 138         return 0;
 139 }
 140
 141 static int tw686x_pcm_prepare(struct snd_pcm_substream *ss)
 142 {
 143         struct tw686x_dev *dev = snd_pcm_substream_chip(ss);
 144         struct tw686x_audio_channel *ac = &dev->audio_channels[ss->number];
 145         struct snd_pcm_runtime *rt = ss->runtime;
 146         unsigned int period_size = snd_pcm_lib_period_bytes(ss);
 147         struct tw686x_audio_buf *p_buf, *b_buf;
 148         unsigned long flags;
 149         int i;
 150
 151         spin_lock_irqsave(&dev->lock, flags);
 152         /*
 153          * Given the audio parameters are global (i.e. shared across
 154          * DMA channels), we need to check new params are allowed.
 155          */
 156         if (((dev->audio_rate != rt->rate) ||
 157              (dev->period_size != period_size)) && dev->audio_enabled)
 158                 goto err_audio_busy;
 159
 160         tw686x_disable_channel(dev, AUDIO_CHANNEL_OFFSET + ac->ch);
 161         spin_unlock_irqrestore(&dev->lock, flags);
 162
 163         if (dev->audio_rate != rt->rate) {
 164                 u32 reg;
 165
 166                 dev->audio_rate = rt->rate;
 167                 reg = ((125000000 / rt->rate) << 16) +
 168                        ((125000000 % rt->rate) << 16) / rt->rate;
 169
 170                 reg_write(dev, AUDIO_CONTROL2, reg);
 171         }
 172
 173         if (dev->period_size != period_size) {
 174                 u32 reg;
 175
 176                 dev->period_size = period_size;
 177                 reg = reg_read(dev, AUDIO_CONTROL1);
 178                 reg &= ~(AUDIO_DMA_SIZE_MASK << AUDIO_DMA_SIZE_SHIFT);
 179                 reg |= period_size << AUDIO_DMA_SIZE_SHIFT;
 180
 181                 reg_write(dev, AUDIO_CONTROL1, reg);
 182         }
 183
 184         if (rt->periods < TW686X_AUDIO_PERIODS_MIN ||
 185             rt->periods > TW686X_AUDIO_PERIODS_MAX)
 186                 return -EINVAL;
 187
 188         spin_lock_irqsave(&ac->lock, flags);
 189         INIT_LIST_HEAD(&ac->buf_list);
 190
 191         for (i = 0; i < rt->periods; i++) {
 192                 ac->buf[i].dma = rt->dma_addr + period_size * i;
 193                 ac->buf[i].virt = rt->dma_area + period_size * i;
 194                 INIT_LIST_HEAD(&ac->buf[i].list);
 195                 list_add_tail(&ac->buf[i].list, &ac->buf_list);
 196         }
 197
 198         p_buf = list_first_entry(&ac->buf_list, struct tw686x_audio_buf, list);
 199         list_move_tail(&p_buf->list, &ac->buf_list);
 200
 201         b_buf = list_first_entry(&ac->buf_list, struct tw686x_audio_buf, list);
 202         list_move_tail(&b_buf->list, &ac->buf_list);
 203
 204         ac->curr_bufs[0] = p_buf;
 205         ac->curr_bufs[1] = b_buf;
 206         ac->ptr = 0;
 207
 208         if (dev->dma_mode != TW686X_DMA_MODE_MEMCPY) {
 209                 reg_write(dev, ADMA_P_ADDR[ac->ch], p_buf->dma);
 210                 reg_write(dev, ADMA_B_ADDR[ac->ch], b_buf->dma);
 211         }
 212
 213         spin_unlock_irqrestore(&ac->lock, flags);
 214
 215         return 0;
 216
 217 err_audio_busy:
 218         spin_unlock_irqrestore(&dev->lock, flags);
 219         return -EBUSY;
 220 }
 221
 222 static int tw686x_pcm_trigger(struct snd_pcm_substream *ss, int cmd)
 223 {
 224         struct tw686x_dev *dev = snd_pcm_substream_chip(ss);
 225         struct tw686x_audio_channel *ac = &dev->audio_channels[ss->number];
 226         unsigned long flags;
 227         int err = 0;
 228
 229         switch (cmd) {
 230         case SNDRV_PCM_TRIGGER_START:
 231                 if (ac->curr_bufs[0] && ac->curr_bufs[1]) {
 232                         spin_lock_irqsave(&dev->lock, flags);
 233                         dev->audio_enabled = 1;
 234                         tw686x_enable_channel(dev,
 235                                 AUDIO_CHANNEL_OFFSET + ac->ch);
 236                         spin_unlock_irqrestore(&dev->lock, flags);
 237
 238                         mod_timer(&dev->dma_delay_timer,
 239                                   jiffies + msecs_to_jiffies(100));
 240                 } else {
 241                         err = -EIO;
 242                 }
 243                 break;
 244         case SNDRV_PCM_TRIGGER_STOP:
 245                 spin_lock_irqsave(&dev->lock, flags);
 246                 dev->audio_enabled = 0;
 247                 tw686x_disable_channel(dev, AUDIO_CHANNEL_OFFSET + ac->ch);
 248                 spin_unlock_irqrestore(&dev->lock, flags);
 249
 250                 spin_lock_irqsave(&ac->lock, flags);
 251                 ac->curr_bufs[0] = NULL;
 252                 ac->curr_bufs[1] = NULL;
 253                 spin_unlock_irqrestore(&ac->lock, flags);
 254                 break;
 255         default:
 256                 err = -EINVAL;
 257         }
 258         return err;
 259 }
 260
 261 static snd_pcm_uframes_t tw686x_pcm_pointer(struct snd_pcm_substream *ss)
 262 {
 263         struct tw686x_dev *dev = snd_pcm_substream_chip(ss);
 264         struct tw686x_audio_channel *ac = &dev->audio_channels[ss->number];
 265
 266         return bytes_to_frames(ss->runtime, ac->ptr);
 267 }
 268
 269 static const struct snd_pcm_ops tw686x_pcm_ops = {
 270         .open = tw686x_pcm_open,
 271         .close = tw686x_pcm_close,
 272         .ioctl = snd_pcm_lib_ioctl,
 273         .hw_params = tw686x_pcm_hw_params,
 274         .hw_free = tw686x_pcm_hw_free,
 275         .prepare = tw686x_pcm_prepare,
 276         .trigger = tw686x_pcm_trigger,
 277         .pointer = tw686x_pcm_pointer,
 278 };
 279
 280 static int tw686x_snd_pcm_init(struct tw686x_dev *dev)
 281 {
 282         struct snd_card *card = dev->snd_card;
 283         struct snd_pcm *pcm;
 284         struct snd_pcm_substream *ss;
 285         unsigned int i;
 286         int err;
 287
 288         err = snd_pcm_new(card, card->driver, 0, 0, max_channels(dev), &pcm);
 289         if (err < 0)
 290                 return err;
 291
 292         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &tw686x_pcm_ops);
 293         snd_pcm_chip(pcm) = dev;
 294         pcm->info_flags = 0;
 295         strscpy(pcm->name, "tw686x PCM", sizeof(pcm->name));
 296
 297         for (i = 0, ss = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream;
 298              ss; ss = ss->next, i++)
 299                 snprintf(ss->name, sizeof(ss->name), "vch%u audio", i);
 300
 301         snd_pcm_lib_preallocate_pages_for_all(pcm,
 302                                 SNDRV_DMA_TYPE_DEV,
 303                                 snd_dma_pci_data(dev->pci_dev),
 304                                 TW686X_AUDIO_PAGE_MAX * AUDIO_DMA_SIZE_MAX,
 305                                 TW686X_AUDIO_PAGE_MAX * AUDIO_DMA_SIZE_MAX);
 306         return 0;
 307 }
 308
 309 static void tw686x_audio_dma_free(struct tw686x_dev *dev,
 310                                   struct tw686x_audio_channel *ac)
 311 {
 312         int pb;
 313
 314         for (pb = 0; pb < 2; pb++) {
 315                 if (!ac->dma_descs[pb].virt)
 316                         continue;
 317                 pci_free_consistent(dev->pci_dev, ac->dma_descs[pb].size,
 318                                     ac->dma_descs[pb].virt,
 319                                     ac->dma_descs[pb].phys);
 320                 ac->dma_descs[pb].virt = NULL;
 321         }
 322 }
 323
 324 static int tw686x_audio_dma_alloc(struct tw686x_dev *dev,
 325                                   struct tw686x_audio_channel *ac)
 326 {
 327         int pb;
 328
 329         /*
 330          * In the memcpy DMA mode we allocate a consistent buffer
 331          * and use it for the DMA capture. Otherwise, DMA
 332          * acts on the ALSA buffers as received in pcm_prepare.
 333          */
 334         if (dev->dma_mode != TW686X_DMA_MODE_MEMCPY)
 335                 return 0;
 336
 337         for (pb = 0; pb < 2; pb++) {
 338                 u32 reg = pb ? ADMA_B_ADDR[ac->ch] : ADMA_P_ADDR[ac->ch];
 339                 void *virt;
 340
 341                 virt = pci_alloc_consistent(dev->pci_dev, AUDIO_DMA_SIZE_MAX,
 342                                             &ac->dma_descs[pb].phys);
 343                 if (!virt) {
 344                         dev_err(&dev->pci_dev->dev,
 345                                 "dma%d: unable to allocate audio DMA %s-buffer\n",
 346                                 ac->ch, pb ? "B" : "P");
 347                         return -ENOMEM;
 348                 }
 349                 ac->dma_descs[pb].virt = virt;
 350                 ac->dma_descs[pb].size = AUDIO_DMA_SIZE_MAX;
 351                 reg_write(dev, reg, ac->dma_descs[pb].phys);
 352         }
 353         return 0;
 354 }
 355
 356 void tw686x_audio_free(struct tw686x_dev *dev)
 357 {
 358         unsigned long flags;
 359         u32 dma_ch_mask;
 360         u32 dma_cmd;
 361
 362         spin_lock_irqsave(&dev->lock, flags);
 363         dma_cmd = reg_read(dev, DMA_CMD);
 364         dma_ch_mask = reg_read(dev, DMA_CHANNEL_ENABLE);
 365         reg_write(dev, DMA_CMD, dma_cmd & ~0xff00);
 366         reg_write(dev, DMA_CHANNEL_ENABLE, dma_ch_mask & ~0xff00);
 367         spin_unlock_irqrestore(&dev->lock, flags);
 368
 369         if (!dev->snd_card)
 370                 return;
 371         snd_card_free(dev->snd_card);
 372         dev->snd_card = NULL;
 373 }
 374
 375 int tw686x_audio_init(struct tw686x_dev *dev)
 376 {
 377         struct pci_dev *pci_dev = dev->pci_dev;
 378         struct snd_card *card;
 379         int err, ch;
 380
 381         /* Enable external audio */
 382         reg_write(dev, AUDIO_CONTROL1, BIT(0));
 383
 384         err = snd_card_new(&pci_dev->dev, SNDRV_DEFAULT_IDX1,
 385                            SNDRV_DEFAULT_STR1,
 386                            THIS_MODULE, 0, &card);
 387         if (err < 0)
 388                 return err;
 389
 390         dev->snd_card = card;
 391         strscpy(card->driver, "tw686x", sizeof(card->driver));
 392         strscpy(card->shortname, "tw686x", sizeof(card->shortname));
 393         strscpy(card->longname, pci_name(pci_dev), sizeof(card->longname));
 394         snd_card_set_dev(card, &pci_dev->dev);
 395
 396         for (ch = 0; ch < max_channels(dev); ch++) {
 397                 struct tw686x_audio_channel *ac;
 398
 399                 ac = &dev->audio_channels[ch];
 400                 spin_lock_init(&ac->lock);
 401                 ac->dev = dev;
 402                 ac->ch = ch;
 403
 404                 err = tw686x_audio_dma_alloc(dev, ac);
 405                 if (err < 0)
 406                         goto err_cleanup;
 407         }
 408
 409         err = tw686x_snd_pcm_init(dev);
 410         if (err < 0)
 411                 goto err_cleanup;
 412
 413         err = snd_card_register(card);
 414         if (!err)
 415                 return 0;
 416
 417 err_cleanup:
 418         for (ch = 0; ch < max_channels(dev); ch++) {
 419                 if (!dev->audio_channels[ch].dev)
 420                         continue;
 421                 tw686x_audio_dma_free(dev, &dev->audio_channels[ch]);
 422         }
 423         snd_card_free(card);
 424         dev->snd_card = NULL;
 425         return err;
 426 }