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

   1 /*
   2  * Copyright (C) 2015 VanguardiaSur - www.vanguardiasur.com.ar
   3  *
   4  * Based on the audio support from the tw6869 driver:
   5  * Copyright 2015 www.starterkit.ru <info@starterkit.ru>
   6  *
   7  * Based on:
   8  * Driver for Intersil|Techwell TW6869 based DVR cards
   9  * (c) 2011-12 liran <jli11@intersil.com> [Intersil|Techwell China]
  10  *
  11  * This program is free software; you can redistribute it and/or modify it
  12  * under the terms of version 2 of the GNU General Public License
  13  * as published by the Free Software Foundation.
  14  */
  15
  16 #include <linux/types.h>
  17 #include <linux/kernel.h>
  18 #include <linux/module.h>
  19 #include <linux/init.h>
  20 #include <linux/kmod.h>
  21 #include <linux/mutex.h>
  22 #include <linux/pci.h>
  23 #include <linux/delay.h>
  24
  25 #include <sound/core.h>
  26 #include <sound/initval.h>
  27 #include <sound/pcm.h>
  28 #include <sound/control.h>
  29 #include "tw686x.h"
  30 #include "tw686x-regs.h"
  31
  32 #define AUDIO_CHANNEL_OFFSET 8
  33
  34 void tw686x_audio_irq(struct tw686x_dev *dev, unsigned long requests,
  35                       unsigned int pb_status)
  36 {
  37         unsigned long flags;
  38         unsigned int ch, pb;
  39
  40         for_each_set_bit(ch, &requests, max_channels(dev)) {
  41                 struct tw686x_audio_channel *ac = &dev->audio_channels[ch];
  42                 struct tw686x_audio_buf *done = NULL;
  43                 struct tw686x_audio_buf *next = NULL;
  44                 struct tw686x_dma_desc *desc;
  45
  46                 pb = !!(pb_status & BIT(AUDIO_CHANNEL_OFFSET + ch));
  47
  48                 spin_lock_irqsave(&ac->lock, flags);
  49
  50                 /* Sanity check */
  51                 if (!ac->ss || !ac->curr_bufs[0] || !ac->curr_bufs[1]) {
  52                         spin_unlock_irqrestore(&ac->lock, flags);
  53                         continue;
  54                 }
  55
  56                 if (!list_empty(&ac->buf_list)) {
  57                         next = list_first_entry(&ac->buf_list,
  58                                         struct tw686x_audio_buf, list);
  59                         list_move_tail(&next->list, &ac->buf_list);
  60                         done = ac->curr_bufs[!pb];
  61                         ac->curr_bufs[pb] = next;
  62                 }
  63                 spin_unlock_irqrestore(&ac->lock, flags);
  64
  65                 if (!done || !next)
  66                         continue;
  67                 /*
  68                  * Checking for a non-nil dma_desc[pb]->virt buffer is
  69                  * the same as checking for memcpy DMA mode.
  70                  */
  71                 desc = &ac->dma_descs[pb];
  72                 if (desc->virt) {
  73                         memcpy(done->virt, desc->virt,
  74                                dev->period_size);
  75                 } else {
  76                         u32 reg = pb ? ADMA_B_ADDR[ch] : ADMA_P_ADDR[ch];
  77                         reg_write(dev, reg, next->dma);
  78                 }
  79                 ac->ptr = done->dma - ac->buf[0].dma;
  80                 snd_pcm_period_elapsed(ac->ss);
  81         }
  82 }
  83
  84 static int tw686x_pcm_hw_params(struct snd_pcm_substream *ss,
  85                                 struct snd_pcm_hw_params *hw_params)
  86 {
  87         return snd_pcm_lib_malloc_pages(ss, params_buffer_bytes(hw_params));
  88 }
  89
  90 static int tw686x_pcm_hw_free(struct snd_pcm_substream *ss)
  91 {
  92         return snd_pcm_lib_free_pages(ss);
  93 }
  94
  95 /*
  96  * Audio parameters are global and shared among all
  97  * capture channels. The driver prevents changes to
  98  * the parameters if any audio channel is capturing.
  99  */
 100 static const struct snd_pcm_hardware tw686x_capture_hw = {
 101         .info                   = (SNDRV_PCM_INFO_MMAP |
 102                                    SNDRV_PCM_INFO_INTERLEAVED |
 103                                    SNDRV_PCM_INFO_BLOCK_TRANSFER |
 104                                    SNDRV_PCM_INFO_MMAP_VALID),
 105         .formats                = SNDRV_PCM_FMTBIT_S16_LE,
 106         .rates                  = SNDRV_PCM_RATE_8000_48000,
 107         .rate_min               = 8000,
 108         .rate_max               = 48000,
 109         .channels_min           = 1,
 110         .channels_max           = 1,
 111         .buffer_bytes_max       = TW686X_AUDIO_PAGE_MAX * AUDIO_DMA_SIZE_MAX,
 112         .period_bytes_min       = AUDIO_DMA_SIZE_MIN,
 113         .period_bytes_max       = AUDIO_DMA_SIZE_MAX,
 114         .periods_min            = TW686X_AUDIO_PERIODS_MIN,
 115         .periods_max            = TW686X_AUDIO_PERIODS_MAX,
 116 };
 117
 118 static int tw686x_pcm_open(struct snd_pcm_substream *ss)
 119 {
 120         struct tw686x_dev *dev = snd_pcm_substream_chip(ss);
 121         struct tw686x_audio_channel *ac = &dev->audio_channels[ss->number];
 122         struct snd_pcm_runtime *rt = ss->runtime;
 123         int err;
 124
 125         ac->ss = ss;
 126         rt->hw = tw686x_capture_hw;
 127
 128         err = snd_pcm_hw_constraint_integer(rt, SNDRV_PCM_HW_PARAM_PERIODS);
 129         if (err < 0)
 130                 return err;
 131
 132         return 0;
 133 }
 134
 135 static int tw686x_pcm_close(struct snd_pcm_substream *ss)
 136 {
 137         struct tw686x_dev *dev = snd_pcm_substream_chip(ss);
 138         struct tw686x_audio_channel *ac = &dev->audio_channels[ss->number];
 139
 140         ac->ss = NULL;
 141         return 0;
 142 }
 143
 144 static int tw686x_pcm_prepare(struct snd_pcm_substream *ss)
 145 {
 146         struct tw686x_dev *dev = snd_pcm_substream_chip(ss);
 147         struct tw686x_audio_channel *ac = &dev->audio_channels[ss->number];
 148         struct snd_pcm_runtime *rt = ss->runtime;
 149         unsigned int period_size = snd_pcm_lib_period_bytes(ss);
 150         struct tw686x_audio_buf *p_buf, *b_buf;
 151         unsigned long flags;
 152         int i;
 153
 154         spin_lock_irqsave(&dev->lock, flags);
 155         /*
 156          * Given the audio parameters are global (i.e. shared across
 157          * DMA channels), we need to check new params are allowed.
 158          */
 159         if (((dev->audio_rate != rt->rate) ||
 160              (dev->period_size != period_size)) && dev->audio_enabled)
 161                 goto err_audio_busy;
 162
 163         tw686x_disable_channel(dev, AUDIO_CHANNEL_OFFSET + ac->ch);
 164         spin_unlock_irqrestore(&dev->lock, flags);
 165
 166         if (dev->audio_rate != rt->rate) {
 167                 u32 reg;
 168
 169                 dev->audio_rate = rt->rate;
 170                 reg = ((125000000 / rt->rate) << 16) +
 171                        ((125000000 % rt->rate) << 16) / rt->rate;
 172
 173                 reg_write(dev, AUDIO_CONTROL2, reg);
 174         }
 175
 176         if (dev->period_size != period_size) {
 177                 u32 reg;
 178
 179                 dev->period_size = period_size;
 180                 reg = reg_read(dev, AUDIO_CONTROL1);
 181                 reg &= ~(AUDIO_DMA_SIZE_MASK << AUDIO_DMA_SIZE_SHIFT);
 182                 reg |= period_size << AUDIO_DMA_SIZE_SHIFT;
 183
 184                 reg_write(dev, AUDIO_CONTROL1, reg);
 185         }
 186
 187         if (rt->periods < TW686X_AUDIO_PERIODS_MIN ||
 188             rt->periods > TW686X_AUDIO_PERIODS_MAX)
 189                 return -EINVAL;
 190
 191         spin_lock_irqsave(&ac->lock, flags);
 192         INIT_LIST_HEAD(&ac->buf_list);
 193
 194         for (i = 0; i < rt->periods; i++) {
 195                 ac->buf[i].dma = rt->dma_addr + period_size * i;
 196                 ac->buf[i].virt = rt->dma_area + period_size * i;
 197                 INIT_LIST_HEAD(&ac->buf[i].list);
 198                 list_add_tail(&ac->buf[i].list, &ac->buf_list);
 199         }
 200
 201         p_buf = list_first_entry(&ac->buf_list, struct tw686x_audio_buf, list);
 202         list_move_tail(&p_buf->list, &ac->buf_list);
 203
 204         b_buf = list_first_entry(&ac->buf_list, struct tw686x_audio_buf, list);
 205         list_move_tail(&b_buf->list, &ac->buf_list);
 206
 207         ac->curr_bufs[0] = p_buf;
 208         ac->curr_bufs[1] = b_buf;
 209         ac->ptr = 0;
 210
 211         if (dev->dma_mode != TW686X_DMA_MODE_MEMCPY) {
 212                 reg_write(dev, ADMA_P_ADDR[ac->ch], p_buf->dma);
 213                 reg_write(dev, ADMA_B_ADDR[ac->ch], b_buf->dma);
 214         }
 215
 216         spin_unlock_irqrestore(&ac->lock, flags);
 217
 218         return 0;
 219
 220 err_audio_busy:
 221         spin_unlock_irqrestore(&dev->lock, flags);
 222         return -EBUSY;
 223 }
 224
 225 static int tw686x_pcm_trigger(struct snd_pcm_substream *ss, int cmd)
 226 {
 227         struct tw686x_dev *dev = snd_pcm_substream_chip(ss);
 228         struct tw686x_audio_channel *ac = &dev->audio_channels[ss->number];
 229         unsigned long flags;
 230         int err = 0;
 231
 232         switch (cmd) {
 233         case SNDRV_PCM_TRIGGER_START:
 234                 if (ac->curr_bufs[0] && ac->curr_bufs[1]) {
 235                         spin_lock_irqsave(&dev->lock, flags);
 236                         dev->audio_enabled = 1;
 237                         tw686x_enable_channel(dev,
 238                                 AUDIO_CHANNEL_OFFSET + ac->ch);
 239                         spin_unlock_irqrestore(&dev->lock, flags);
 240
 241                         mod_timer(&dev->dma_delay_timer,
 242                                   jiffies + msecs_to_jiffies(100));
 243                 } else {
 244                         err = -EIO;
 245                 }
 246                 break;
 247         case SNDRV_PCM_TRIGGER_STOP:
 248                 spin_lock_irqsave(&dev->lock, flags);
 249                 dev->audio_enabled = 0;
 250                 tw686x_disable_channel(dev, AUDIO_CHANNEL_OFFSET + ac->ch);
 251                 spin_unlock_irqrestore(&dev->lock, flags);
 252
 253                 spin_lock_irqsave(&ac->lock, flags);
 254                 ac->curr_bufs[0] = NULL;
 255                 ac->curr_bufs[1] = NULL;
 256                 spin_unlock_irqrestore(&ac->lock, flags);
 257                 break;
 258         default:
 259                 err = -EINVAL;
 260         }
 261         return err;
 262 }
 263
 264 static snd_pcm_uframes_t tw686x_pcm_pointer(struct snd_pcm_substream *ss)
 265 {
 266         struct tw686x_dev *dev = snd_pcm_substream_chip(ss);
 267         struct tw686x_audio_channel *ac = &dev->audio_channels[ss->number];
 268
 269         return bytes_to_frames(ss->runtime, ac->ptr);
 270 }
 271
 272 static const struct snd_pcm_ops tw686x_pcm_ops = {
 273         .open = tw686x_pcm_open,
 274         .close = tw686x_pcm_close,
 275         .ioctl = snd_pcm_lib_ioctl,
 276         .hw_params = tw686x_pcm_hw_params,
 277         .hw_free = tw686x_pcm_hw_free,
 278         .prepare = tw686x_pcm_prepare,
 279         .trigger = tw686x_pcm_trigger,
 280         .pointer = tw686x_pcm_pointer,
 281 };
 282
 283 static int tw686x_snd_pcm_init(struct tw686x_dev *dev)
 284 {
 285         struct snd_card *card = dev->snd_card;
 286         struct snd_pcm *pcm;
 287         struct snd_pcm_substream *ss;
 288         unsigned int i;
 289         int err;
 290
 291         err = snd_pcm_new(card, card->driver, 0, 0, max_channels(dev), &pcm);
 292         if (err < 0)
 293                 return err;
 294
 295         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &tw686x_pcm_ops);
 296         snd_pcm_chip(pcm) = dev;
 297         pcm->info_flags = 0;
 298         strlcpy(pcm->name, "tw686x PCM", sizeof(pcm->name));
 299
 300         for (i = 0, ss = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream;
 301              ss; ss = ss->next, i++)
 302                 snprintf(ss->name, sizeof(ss->name), "vch%u audio", i);
 303
 304         return snd_pcm_lib_preallocate_pages_for_all(pcm,
 305                                 SNDRV_DMA_TYPE_DEV,
 306                                 snd_dma_pci_data(dev->pci_dev),
 307                                 TW686X_AUDIO_PAGE_MAX * AUDIO_DMA_SIZE_MAX,
 308                                 TW686X_AUDIO_PAGE_MAX * AUDIO_DMA_SIZE_MAX);
 309 }
 310
 311 static void tw686x_audio_dma_free(struct tw686x_dev *dev,
 312                                   struct tw686x_audio_channel *ac)
 313 {
 314         int pb;
 315
 316         for (pb = 0; pb < 2; pb++) {
 317                 if (!ac->dma_descs[pb].virt)
 318                         continue;
 319                 pci_free_consistent(dev->pci_dev, ac->dma_descs[pb].size,
 320                                     ac->dma_descs[pb].virt,
 321                                     ac->dma_descs[pb].phys);
 322                 ac->dma_descs[pb].virt = NULL;
 323         }
 324 }
 325
 326 static int tw686x_audio_dma_alloc(struct tw686x_dev *dev,
 327                                   struct tw686x_audio_channel *ac)
 328 {
 329         int pb;
 330
 331         /*
 332          * In the memcpy DMA mode we allocate a consistent buffer
 333          * and use it for the DMA capture. Otherwise, DMA
 334          * acts on the ALSA buffers as received in pcm_prepare.
 335          */
 336         if (dev->dma_mode != TW686X_DMA_MODE_MEMCPY)
 337                 return 0;
 338
 339         for (pb = 0; pb < 2; pb++) {
 340                 u32 reg = pb ? ADMA_B_ADDR[ac->ch] : ADMA_P_ADDR[ac->ch];
 341                 void *virt;
 342
 343                 virt = pci_alloc_consistent(dev->pci_dev, AUDIO_DMA_SIZE_MAX,
 344                                             &ac->dma_descs[pb].phys);
 345                 if (!virt) {
 346                         dev_err(&dev->pci_dev->dev,
 347                                 "dma%d: unable to allocate audio DMA %s-buffer\n",
 348                                 ac->ch, pb ? "B" : "P");
 349                         return -ENOMEM;
 350                 }
 351                 ac->dma_descs[pb].virt = virt;
 352                 ac->dma_descs[pb].size = AUDIO_DMA_SIZE_MAX;
 353                 reg_write(dev, reg, ac->dma_descs[pb].phys);
 354         }
 355         return 0;
 356 }
 357
 358 void tw686x_audio_free(struct tw686x_dev *dev)
 359 {
 360         unsigned long flags;
 361         u32 dma_ch_mask;
 362         u32 dma_cmd;
 363
 364         spin_lock_irqsave(&dev->lock, flags);
 365         dma_cmd = reg_read(dev, DMA_CMD);
 366         dma_ch_mask = reg_read(dev, DMA_CHANNEL_ENABLE);
 367         reg_write(dev, DMA_CMD, dma_cmd & ~0xff00);
 368         reg_write(dev, DMA_CHANNEL_ENABLE, dma_ch_mask & ~0xff00);
 369         spin_unlock_irqrestore(&dev->lock, flags);
 370
 371         if (!dev->snd_card)
 372                 return;
 373         snd_card_free(dev->snd_card);
 374         dev->snd_card = NULL;
 375 }
 376
 377 int tw686x_audio_init(struct tw686x_dev *dev)
 378 {
 379         struct pci_dev *pci_dev = dev->pci_dev;
 380         struct snd_card *card;
 381         int err, ch;
 382
 383         /* Enable external audio */
 384         reg_write(dev, AUDIO_CONTROL1, BIT(0));
 385
 386         err = snd_card_new(&pci_dev->dev, SNDRV_DEFAULT_IDX1,
 387                            SNDRV_DEFAULT_STR1,
 388                            THIS_MODULE, 0, &card);
 389         if (err < 0)
 390                 return err;
 391
 392         dev->snd_card = card;
 393         strlcpy(card->driver, "tw686x", sizeof(card->driver));
 394         strlcpy(card->shortname, "tw686x", sizeof(card->shortname));
 395         strlcpy(card->longname, pci_name(pci_dev), sizeof(card->longname));
 396         snd_card_set_dev(card, &pci_dev->dev);
 397
 398         for (ch = 0; ch < max_channels(dev); ch++) {
 399                 struct tw686x_audio_channel *ac;
 400
 401                 ac = &dev->audio_channels[ch];
 402                 spin_lock_init(&ac->lock);
 403                 ac->dev = dev;
 404                 ac->ch = ch;
 405
 406                 err = tw686x_audio_dma_alloc(dev, ac);
 407                 if (err < 0)
 408                         goto err_cleanup;
 409         }
 410
 411         err = tw686x_snd_pcm_init(dev);
 412         if (err < 0)
 413                 goto err_cleanup;
 414
 415         err = snd_card_register(card);
 416         if (!err)
 417                 return 0;
 418
 419 err_cleanup:
 420         for (ch = 0; ch < max_channels(dev); ch++) {
 421                 if (!dev->audio_channels[ch].dev)
 422                         continue;
 423                 tw686x_audio_dma_free(dev, &dev->audio_channels[ch]);
 424         }
 425         snd_card_free(card);
 426         dev->snd_card = NULL;
 427         return err;
 428 }