sound/aoa/soundbus/i2sbus/pcm.c

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This source file includes following definitions.
get_pcm_info
clock_and_divisors
i2sbus_pcm_open
i2sbus_pcm_close
i2sbus_wait_for_stop
i2sbus_wait_for_stop_both
i2sbus_hw_params
i2sbus_hw_free
i2sbus_playback_hw_free
i2sbus_record_hw_free
i2sbus_pcm_prepare
i2sbus_pcm_prepare_both
i2sbus_pcm_trigger
i2sbus_pcm_pointer
handle_interrupt
i2sbus_tx_intr
i2sbus_rx_intr
i2sbus_playback_open
i2sbus_playback_close
i2sbus_playback_prepare
i2sbus_playback_trigger
i2sbus_playback_pointer
i2sbus_record_open
i2sbus_record_close
i2sbus_record_prepare
i2sbus_record_trigger
i2sbus_record_pointer
i2sbus_private_free
i2sbus_attach_codec
i2sbus_detach_codec
   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * i2sbus driver -- pcm routines
   4  *
   5  * Copyright 2006 Johannes Berg <johannes@sipsolutions.net>
   6  */
   7 
   8 #include <linux/io.h>
   9 #include <linux/delay.h>
  10 #include <linux/slab.h>
  11 #include <sound/core.h>
  12 #include <asm/macio.h>
  13 #include <linux/pci.h>
  14 #include <linux/module.h>
  15 #include "../soundbus.h"
  16 #include "i2sbus.h"
  17 
  18 static inline void get_pcm_info(struct i2sbus_dev *i2sdev, int in,
  19                                 struct pcm_info **pi, struct pcm_info **other)
  20 {
  21         if (in) {
  22                 if (pi)
  23                         *pi = &i2sdev->in;
  24                 if (other)
  25                         *other = &i2sdev->out;
  26         } else {
  27                 if (pi)
  28                         *pi = &i2sdev->out;
  29                 if (other)
  30                         *other = &i2sdev->in;
  31         }
  32 }
  33 
  34 static int clock_and_divisors(int mclk, int sclk, int rate, int *out)
  35 {
  36         /* sclk must be derived from mclk! */
  37         if (mclk % sclk)
  38                 return -1;
  39         /* derive sclk register value */
  40         if (i2s_sf_sclkdiv(mclk / sclk, out))
  41                 return -1;
  42 
  43         if (I2S_CLOCK_SPEED_18MHz % (rate * mclk) == 0) {
  44                 if (!i2s_sf_mclkdiv(I2S_CLOCK_SPEED_18MHz / (rate * mclk), out)) {
  45                         *out |= I2S_SF_CLOCK_SOURCE_18MHz;
  46                         return 0;
  47                 }
  48         }
  49         if (I2S_CLOCK_SPEED_45MHz % (rate * mclk) == 0) {
  50                 if (!i2s_sf_mclkdiv(I2S_CLOCK_SPEED_45MHz / (rate * mclk), out)) {
  51                         *out |= I2S_SF_CLOCK_SOURCE_45MHz;
  52                         return 0;
  53                 }
  54         }
  55         if (I2S_CLOCK_SPEED_49MHz % (rate * mclk) == 0) {
  56                 if (!i2s_sf_mclkdiv(I2S_CLOCK_SPEED_49MHz / (rate * mclk), out)) {
  57                         *out |= I2S_SF_CLOCK_SOURCE_49MHz;
  58                         return 0;
  59                 }
  60         }
  61         return -1;
  62 }
  63 
  64 #define CHECK_RATE(rate)                                                \
  65         do { if (rates & SNDRV_PCM_RATE_ ##rate) {                      \
  66                 int dummy;                                              \
  67                 if (clock_and_divisors(sysclock_factor,                 \
  68                                        bus_factor, rate, &dummy))       \
  69                         rates &= ~SNDRV_PCM_RATE_ ##rate;               \
  70         } } while (0)
  71 
  72 static int i2sbus_pcm_open(struct i2sbus_dev *i2sdev, int in)
  73 {
  74         struct pcm_info *pi, *other;
  75         struct soundbus_dev *sdev;
  76         int masks_inited = 0, err;
  77         struct codec_info_item *cii, *rev;
  78         struct snd_pcm_hardware *hw;
  79         u64 formats = 0;
  80         unsigned int rates = 0;
  81         struct transfer_info v;
  82         int result = 0;
  83         int bus_factor = 0, sysclock_factor = 0;
  84         int found_this;
  85 
  86         mutex_lock(&i2sdev->lock);
  87 
  88         get_pcm_info(i2sdev, in, &pi, &other);
  89 
  90         hw = &pi->substream->runtime->hw;
  91         sdev = &i2sdev->sound;
  92 
  93         if (pi->active) {
  94                 /* alsa messed up */
  95                 result = -EBUSY;
  96                 goto out_unlock;
  97         }
  98 
  99         /* we now need to assign the hw */
 100         list_for_each_entry(cii, &sdev->codec_list, list) {
 101                 struct transfer_info *ti = cii->codec->transfers;
 102                 bus_factor = cii->codec->bus_factor;
 103                 sysclock_factor = cii->codec->sysclock_factor;
 104                 while (ti->formats && ti->rates) {
 105                         v = *ti;
 106                         if (ti->transfer_in == in
 107                             && cii->codec->usable(cii, ti, &v)) {
 108                                 if (masks_inited) {
 109                                         formats &= v.formats;
 110                                         rates &= v.rates;
 111                                 } else {
 112                                         formats = v.formats;
 113                                         rates = v.rates;
 114                                         masks_inited = 1;
 115                                 }
 116                         }
 117                         ti++;
 118                 }
 119         }
 120         if (!masks_inited || !bus_factor || !sysclock_factor) {
 121                 result = -ENODEV;
 122                 goto out_unlock;
 123         }
 124         /* bus dependent stuff */
 125         hw->info = SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID |
 126                    SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_RESUME |
 127                    SNDRV_PCM_INFO_JOINT_DUPLEX;
 128 
 129         CHECK_RATE(5512);
 130         CHECK_RATE(8000);
 131         CHECK_RATE(11025);
 132         CHECK_RATE(16000);
 133         CHECK_RATE(22050);
 134         CHECK_RATE(32000);
 135         CHECK_RATE(44100);
 136         CHECK_RATE(48000);
 137         CHECK_RATE(64000);
 138         CHECK_RATE(88200);
 139         CHECK_RATE(96000);
 140         CHECK_RATE(176400);
 141         CHECK_RATE(192000);
 142         hw->rates = rates;
 143 
 144         /* well. the codec might want 24 bits only, and we'll
 145          * ever only transfer 24 bits, but they are top-aligned!
 146          * So for alsa, we claim that we're doing full 32 bit
 147          * while in reality we'll ignore the lower 8 bits of
 148          * that when doing playback (they're transferred as 0
 149          * as far as I know, no codecs we have are 32-bit capable
 150          * so I can't really test) and when doing recording we'll
 151          * always have those lower 8 bits recorded as 0 */
 152         if (formats & SNDRV_PCM_FMTBIT_S24_BE)
 153                 formats |= SNDRV_PCM_FMTBIT_S32_BE;
 154         if (formats & SNDRV_PCM_FMTBIT_U24_BE)
 155                 formats |= SNDRV_PCM_FMTBIT_U32_BE;
 156         /* now mask off what we can support. I suppose we could
 157          * also support S24_3LE and some similar formats, but I
 158          * doubt there's a codec that would be able to use that,
 159          * so we don't support it here. */
 160         hw->formats = formats & (SNDRV_PCM_FMTBIT_S16_BE |
 161                                  SNDRV_PCM_FMTBIT_U16_BE |
 162                                  SNDRV_PCM_FMTBIT_S32_BE |
 163                                  SNDRV_PCM_FMTBIT_U32_BE);
 164 
 165         /* we need to set the highest and lowest rate possible.
 166          * These are the highest and lowest rates alsa can
 167          * support properly in its bitfield.
 168          * Below, we'll use that to restrict to the rate
 169          * currently in use (if any). */
 170         hw->rate_min = 5512;
 171         hw->rate_max = 192000;
 172         /* if the other stream is active, then we can only
 173          * support what it is currently using.
 174          * FIXME: I lied. This comment is wrong. We can support
 175          * anything that works with the same serial format, ie.
 176          * when recording 24 bit sound we can well play 16 bit
 177          * sound at the same time iff using the same transfer mode.
 178          */
 179         if (other->active) {
 180                 /* FIXME: is this guaranteed by the alsa api? */
 181                 hw->formats &= pcm_format_to_bits(i2sdev->format);
 182                 /* see above, restrict rates to the one we already have */
 183                 hw->rate_min = i2sdev->rate;
 184                 hw->rate_max = i2sdev->rate;
 185         }
 186 
 187         hw->channels_min = 2;
 188         hw->channels_max = 2;
 189         /* these are somewhat arbitrary */
 190         hw->buffer_bytes_max = 131072;
 191         hw->period_bytes_min = 256;
 192         hw->period_bytes_max = 16384;
 193         hw->periods_min = 3;
 194         hw->periods_max = MAX_DBDMA_COMMANDS;
 195         err = snd_pcm_hw_constraint_integer(pi->substream->runtime,
 196                                             SNDRV_PCM_HW_PARAM_PERIODS);
 197         if (err < 0) {
 198                 result = err;
 199                 goto out_unlock;
 200         }
 201         list_for_each_entry(cii, &sdev->codec_list, list) {
 202                 if (cii->codec->open) {
 203                         err = cii->codec->open(cii, pi->substream);
 204                         if (err) {
 205                                 result = err;
 206                                 /* unwind */
 207                                 found_this = 0;
 208                                 list_for_each_entry_reverse(rev,
 209                                     &sdev->codec_list, list) {
 210                                         if (found_this && rev->codec->close) {
 211                                                 rev->codec->close(rev,
 212                                                                 pi->substream);
 213                                         }
 214                                         if (rev == cii)
 215                                                 found_this = 1;
 216                                 }
 217                                 goto out_unlock;
 218                         }
 219                 }
 220         }
 221 
 222  out_unlock:
 223         mutex_unlock(&i2sdev->lock);
 224         return result;
 225 }
 226 
 227 #undef CHECK_RATE
 228 
 229 static int i2sbus_pcm_close(struct i2sbus_dev *i2sdev, int in)
 230 {
 231         struct codec_info_item *cii;
 232         struct pcm_info *pi;
 233         int err = 0, tmp;
 234 
 235         mutex_lock(&i2sdev->lock);
 236 
 237         get_pcm_info(i2sdev, in, &pi, NULL);
 238 
 239         list_for_each_entry(cii, &i2sdev->sound.codec_list, list) {
 240                 if (cii->codec->close) {
 241                         tmp = cii->codec->close(cii, pi->substream);
 242                         if (tmp)
 243                                 err = tmp;
 244                 }
 245         }
 246 
 247         pi->substream = NULL;
 248         pi->active = 0;
 249         mutex_unlock(&i2sdev->lock);
 250         return err;
 251 }
 252 
 253 static void i2sbus_wait_for_stop(struct i2sbus_dev *i2sdev,
 254                                  struct pcm_info *pi)
 255 {
 256         unsigned long flags;
 257         struct completion done;
 258         long timeout;
 259 
 260         spin_lock_irqsave(&i2sdev->low_lock, flags);
 261         if (pi->dbdma_ring.stopping) {
 262                 init_completion(&done);
 263                 pi->stop_completion = &done;
 264                 spin_unlock_irqrestore(&i2sdev->low_lock, flags);
 265                 timeout = wait_for_completion_timeout(&done, HZ);
 266                 spin_lock_irqsave(&i2sdev->low_lock, flags);
 267                 pi->stop_completion = NULL;
 268                 if (timeout == 0) {
 269                         /* timeout expired, stop dbdma forcefully */
 270                         printk(KERN_ERR "i2sbus_wait_for_stop: timed out\n");
 271                         /* make sure RUN, PAUSE and S0 bits are cleared */
 272                         out_le32(&pi->dbdma->control, (RUN | PAUSE | 1) << 16);
 273                         pi->dbdma_ring.stopping = 0;
 274                         timeout = 10;
 275                         while (in_le32(&pi->dbdma->status) & ACTIVE) {
 276                                 if (--timeout <= 0)
 277                                         break;
 278                                 udelay(1);
 279                         }
 280                 }
 281         }
 282         spin_unlock_irqrestore(&i2sdev->low_lock, flags);
 283 }
 284 
 285 #ifdef CONFIG_PM
 286 void i2sbus_wait_for_stop_both(struct i2sbus_dev *i2sdev)
 287 {
 288         struct pcm_info *pi;
 289 
 290         get_pcm_info(i2sdev, 0, &pi, NULL);
 291         i2sbus_wait_for_stop(i2sdev, pi);
 292         get_pcm_info(i2sdev, 1, &pi, NULL);
 293         i2sbus_wait_for_stop(i2sdev, pi);
 294 }
 295 #endif
 296 
 297 static int i2sbus_hw_params(struct snd_pcm_substream *substream,
 298                             struct snd_pcm_hw_params *params)
 299 {
 300         return snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(params));
 301 }
 302 
 303 static inline int i2sbus_hw_free(struct snd_pcm_substream *substream, int in)
 304 {
 305         struct i2sbus_dev *i2sdev = snd_pcm_substream_chip(substream);
 306         struct pcm_info *pi;
 307 
 308         get_pcm_info(i2sdev, in, &pi, NULL);
 309         if (pi->dbdma_ring.stopping)
 310                 i2sbus_wait_for_stop(i2sdev, pi);
 311         snd_pcm_lib_free_pages(substream);
 312         return 0;
 313 }
 314 
 315 static int i2sbus_playback_hw_free(struct snd_pcm_substream *substream)
 316 {
 317         return i2sbus_hw_free(substream, 0);
 318 }
 319 
 320 static int i2sbus_record_hw_free(struct snd_pcm_substream *substream)
 321 {
 322         return i2sbus_hw_free(substream, 1);
 323 }
 324 
 325 static int i2sbus_pcm_prepare(struct i2sbus_dev *i2sdev, int in)
 326 {
 327         /* whee. Hard work now. The user has selected a bitrate
 328          * and bit format, so now we have to program our
 329          * I2S controller appropriately. */
 330         struct snd_pcm_runtime *runtime;
 331         struct dbdma_cmd *command;
 332         int i, periodsize, nperiods;
 333         dma_addr_t offset;
 334         struct bus_info bi;
 335         struct codec_info_item *cii;
 336         int sfr = 0;            /* serial format register */
 337         int dws = 0;            /* data word sizes reg */
 338         int input_16bit;
 339         struct pcm_info *pi, *other;
 340         int cnt;
 341         int result = 0;
 342         unsigned int cmd, stopaddr;
 343 
 344         mutex_lock(&i2sdev->lock);
 345 
 346         get_pcm_info(i2sdev, in, &pi, &other);
 347 
 348         if (pi->dbdma_ring.running) {
 349                 result = -EBUSY;
 350                 goto out_unlock;
 351         }
 352         if (pi->dbdma_ring.stopping)
 353                 i2sbus_wait_for_stop(i2sdev, pi);
 354 
 355         if (!pi->substream || !pi->substream->runtime) {
 356                 result = -EINVAL;
 357                 goto out_unlock;
 358         }
 359 
 360         runtime = pi->substream->runtime;
 361         pi->active = 1;
 362         if (other->active &&
 363             ((i2sdev->format != runtime->format)
 364              || (i2sdev->rate != runtime->rate))) {
 365                 result = -EINVAL;
 366                 goto out_unlock;
 367         }
 368 
 369         i2sdev->format = runtime->format;
 370         i2sdev->rate = runtime->rate;
 371 
 372         periodsize = snd_pcm_lib_period_bytes(pi->substream);
 373         nperiods = pi->substream->runtime->periods;
 374         pi->current_period = 0;
 375 
 376         /* generate dbdma command ring first */
 377         command = pi->dbdma_ring.cmds;
 378         memset(command, 0, (nperiods + 2) * sizeof(struct dbdma_cmd));
 379 
 380         /* commands to DMA to/from the ring */
 381         /*
 382          * For input, we need to do a graceful stop; if we abort
 383          * the DMA, we end up with leftover bytes that corrupt
 384          * the next recording.  To do this we set the S0 status
 385          * bit and wait for the DMA controller to stop.  Each
 386          * command has a branch condition to
 387          * make it branch to a stop command if S0 is set.
 388          * On input we also need to wait for the S7 bit to be
 389          * set before turning off the DMA controller.
 390          * In fact we do the graceful stop for output as well.
 391          */
 392         offset = runtime->dma_addr;
 393         cmd = (in? INPUT_MORE: OUTPUT_MORE) | BR_IFSET | INTR_ALWAYS;
 394         stopaddr = pi->dbdma_ring.bus_cmd_start +
 395                 (nperiods + 1) * sizeof(struct dbdma_cmd);
 396         for (i = 0; i < nperiods; i++, command++, offset += periodsize) {
 397                 command->command = cpu_to_le16(cmd);
 398                 command->cmd_dep = cpu_to_le32(stopaddr);
 399                 command->phy_addr = cpu_to_le32(offset);
 400                 command->req_count = cpu_to_le16(periodsize);
 401         }
 402 
 403         /* branch back to beginning of ring */
 404         command->command = cpu_to_le16(DBDMA_NOP | BR_ALWAYS);
 405         command->cmd_dep = cpu_to_le32(pi->dbdma_ring.bus_cmd_start);
 406         command++;
 407 
 408         /* set stop command */
 409         command->command = cpu_to_le16(DBDMA_STOP);
 410 
 411         /* ok, let's set the serial format and stuff */
 412         switch (runtime->format) {
 413         /* 16 bit formats */
 414         case SNDRV_PCM_FORMAT_S16_BE:
 415         case SNDRV_PCM_FORMAT_U16_BE:
 416                 /* FIXME: if we add different bus factors we need to
 417                  * do more here!! */
 418                 bi.bus_factor = 0;
 419                 list_for_each_entry(cii, &i2sdev->sound.codec_list, list) {
 420                         bi.bus_factor = cii->codec->bus_factor;
 421                         break;
 422                 }
 423                 if (!bi.bus_factor) {
 424                         result = -ENODEV;
 425                         goto out_unlock;
 426                 }
 427                 input_16bit = 1;
 428                 break;
 429         case SNDRV_PCM_FORMAT_S32_BE:
 430         case SNDRV_PCM_FORMAT_U32_BE:
 431                 /* force 64x bus speed, otherwise the data cannot be
 432                  * transferred quickly enough! */
 433                 bi.bus_factor = 64;
 434                 input_16bit = 0;
 435                 break;
 436         default:
 437                 result = -EINVAL;
 438                 goto out_unlock;
 439         }
 440         /* we assume all sysclocks are the same! */
 441         list_for_each_entry(cii, &i2sdev->sound.codec_list, list) {
 442                 bi.sysclock_factor = cii->codec->sysclock_factor;
 443                 break;
 444         }
 445 
 446         if (clock_and_divisors(bi.sysclock_factor,
 447                                bi.bus_factor,
 448                                runtime->rate,
 449                                &sfr) < 0) {
 450                 result = -EINVAL;
 451                 goto out_unlock;
 452         }
 453         switch (bi.bus_factor) {
 454         case 32:
 455                 sfr |= I2S_SF_SERIAL_FORMAT_I2S_32X;
 456                 break;
 457         case 64:
 458                 sfr |= I2S_SF_SERIAL_FORMAT_I2S_64X;
 459                 break;
 460         }
 461         /* FIXME: THIS ASSUMES MASTER ALL THE TIME */
 462         sfr |= I2S_SF_SCLK_MASTER;
 463 
 464         list_for_each_entry(cii, &i2sdev->sound.codec_list, list) {
 465                 int err = 0;
 466                 if (cii->codec->prepare)
 467                         err = cii->codec->prepare(cii, &bi, pi->substream);
 468                 if (err) {
 469                         result = err;
 470                         goto out_unlock;
 471                 }
 472         }
 473         /* codecs are fine with it, so set our clocks */
 474         if (input_16bit)
 475                 dws =   (2 << I2S_DWS_NUM_CHANNELS_IN_SHIFT) |
 476                         (2 << I2S_DWS_NUM_CHANNELS_OUT_SHIFT) |
 477                         I2S_DWS_DATA_IN_16BIT | I2S_DWS_DATA_OUT_16BIT;
 478         else
 479                 dws =   (2 << I2S_DWS_NUM_CHANNELS_IN_SHIFT) |
 480                         (2 << I2S_DWS_NUM_CHANNELS_OUT_SHIFT) |
 481                         I2S_DWS_DATA_IN_24BIT | I2S_DWS_DATA_OUT_24BIT;
 482 
 483         /* early exit if already programmed correctly */
 484         /* not locking these is fine since we touch them only in this function */
 485         if (in_le32(&i2sdev->intfregs->serial_format) == sfr
 486          && in_le32(&i2sdev->intfregs->data_word_sizes) == dws)
 487                 goto out_unlock;
 488 
 489         /* let's notify the codecs about clocks going away.
 490          * For now we only do mastering on the i2s cell... */
 491         list_for_each_entry(cii, &i2sdev->sound.codec_list, list)
 492                 if (cii->codec->switch_clock)
 493                         cii->codec->switch_clock(cii, CLOCK_SWITCH_PREPARE_SLAVE);
 494 
 495         i2sbus_control_enable(i2sdev->control, i2sdev);
 496         i2sbus_control_cell(i2sdev->control, i2sdev, 1);
 497 
 498         out_le32(&i2sdev->intfregs->intr_ctl, I2S_PENDING_CLOCKS_STOPPED);
 499 
 500         i2sbus_control_clock(i2sdev->control, i2sdev, 0);
 501 
 502         msleep(1);
 503 
 504         /* wait for clock stopped. This can apparently take a while... */
 505         cnt = 100;
 506         while (cnt-- &&
 507             !(in_le32(&i2sdev->intfregs->intr_ctl) & I2S_PENDING_CLOCKS_STOPPED)) {
 508                 msleep(5);
 509         }
 510         out_le32(&i2sdev->intfregs->intr_ctl, I2S_PENDING_CLOCKS_STOPPED);
 511 
 512         /* not locking these is fine since we touch them only in this function */
 513         out_le32(&i2sdev->intfregs->serial_format, sfr);
 514         out_le32(&i2sdev->intfregs->data_word_sizes, dws);
 515 
 516         i2sbus_control_enable(i2sdev->control, i2sdev);
 517         i2sbus_control_cell(i2sdev->control, i2sdev, 1);
 518         i2sbus_control_clock(i2sdev->control, i2sdev, 1);
 519         msleep(1);
 520 
 521         list_for_each_entry(cii, &i2sdev->sound.codec_list, list)
 522                 if (cii->codec->switch_clock)
 523                         cii->codec->switch_clock(cii, CLOCK_SWITCH_SLAVE);
 524 
 525  out_unlock:
 526         mutex_unlock(&i2sdev->lock);
 527         return result;
 528 }
 529 
 530 #ifdef CONFIG_PM
 531 void i2sbus_pcm_prepare_both(struct i2sbus_dev *i2sdev)
 532 {
 533         i2sbus_pcm_prepare(i2sdev, 0);
 534         i2sbus_pcm_prepare(i2sdev, 1);
 535 }
 536 #endif
 537 
 538 static int i2sbus_pcm_trigger(struct i2sbus_dev *i2sdev, int in, int cmd)
 539 {
 540         struct codec_info_item *cii;
 541         struct pcm_info *pi;
 542         int result = 0;
 543         unsigned long flags;
 544 
 545         spin_lock_irqsave(&i2sdev->low_lock, flags);
 546 
 547         get_pcm_info(i2sdev, in, &pi, NULL);
 548 
 549         switch (cmd) {
 550         case SNDRV_PCM_TRIGGER_START:
 551         case SNDRV_PCM_TRIGGER_RESUME:
 552                 if (pi->dbdma_ring.running) {
 553                         result = -EALREADY;
 554                         goto out_unlock;
 555                 }
 556                 list_for_each_entry(cii, &i2sdev->sound.codec_list, list)
 557                         if (cii->codec->start)
 558                                 cii->codec->start(cii, pi->substream);
 559                 pi->dbdma_ring.running = 1;
 560 
 561                 if (pi->dbdma_ring.stopping) {
 562                         /* Clear the S0 bit, then see if we stopped yet */
 563                         out_le32(&pi->dbdma->control, 1 << 16);
 564                         if (in_le32(&pi->dbdma->status) & ACTIVE) {
 565                                 /* possible race here? */
 566                                 udelay(10);
 567                                 if (in_le32(&pi->dbdma->status) & ACTIVE) {
 568                                         pi->dbdma_ring.stopping = 0;
 569                                         goto out_unlock; /* keep running */
 570                                 }
 571                         }
 572                 }
 573 
 574                 /* make sure RUN, PAUSE and S0 bits are cleared */
 575                 out_le32(&pi->dbdma->control, (RUN | PAUSE | 1) << 16);
 576 
 577                 /* set branch condition select register */
 578                 out_le32(&pi->dbdma->br_sel, (1 << 16) | 1);
 579 
 580                 /* write dma command buffer address to the dbdma chip */
 581                 out_le32(&pi->dbdma->cmdptr, pi->dbdma_ring.bus_cmd_start);
 582 
 583                 /* initialize the frame count and current period */
 584                 pi->current_period = 0;
 585                 pi->frame_count = in_le32(&i2sdev->intfregs->frame_count);
 586 
 587                 /* set the DMA controller running */
 588                 out_le32(&pi->dbdma->control, (RUN << 16) | RUN);
 589 
 590                 /* off you go! */
 591                 break;
 592 
 593         case SNDRV_PCM_TRIGGER_STOP:
 594         case SNDRV_PCM_TRIGGER_SUSPEND:
 595                 if (!pi->dbdma_ring.running) {
 596                         result = -EALREADY;
 597                         goto out_unlock;
 598                 }
 599                 pi->dbdma_ring.running = 0;
 600 
 601                 /* Set the S0 bit to make the DMA branch to the stop cmd */
 602                 out_le32(&pi->dbdma->control, (1 << 16) | 1);
 603                 pi->dbdma_ring.stopping = 1;
 604 
 605                 list_for_each_entry(cii, &i2sdev->sound.codec_list, list)
 606                         if (cii->codec->stop)
 607                                 cii->codec->stop(cii, pi->substream);
 608                 break;
 609         default:
 610                 result = -EINVAL;
 611                 goto out_unlock;
 612         }
 613 
 614  out_unlock:
 615         spin_unlock_irqrestore(&i2sdev->low_lock, flags);
 616         return result;
 617 }
 618 
 619 static snd_pcm_uframes_t i2sbus_pcm_pointer(struct i2sbus_dev *i2sdev, int in)
 620 {
 621         struct pcm_info *pi;
 622         u32 fc;
 623 
 624         get_pcm_info(i2sdev, in, &pi, NULL);
 625 
 626         fc = in_le32(&i2sdev->intfregs->frame_count);
 627         fc = fc - pi->frame_count;
 628 
 629         if (fc >= pi->substream->runtime->buffer_size)
 630                 fc %= pi->substream->runtime->buffer_size;
 631         return fc;
 632 }
 633 
 634 static inline void handle_interrupt(struct i2sbus_dev *i2sdev, int in)
 635 {
 636         struct pcm_info *pi;
 637         u32 fc, nframes;
 638         u32 status;
 639         int timeout, i;
 640         int dma_stopped = 0;
 641         struct snd_pcm_runtime *runtime;
 642 
 643         spin_lock(&i2sdev->low_lock);
 644         get_pcm_info(i2sdev, in, &pi, NULL);
 645         if (!pi->dbdma_ring.running && !pi->dbdma_ring.stopping)
 646                 goto out_unlock;
 647 
 648         i = pi->current_period;
 649         runtime = pi->substream->runtime;
 650         while (pi->dbdma_ring.cmds[i].xfer_status) {
 651                 if (le16_to_cpu(pi->dbdma_ring.cmds[i].xfer_status) & BT)
 652                         /*
 653                          * BT is the branch taken bit.  If it took a branch
 654                          * it is because we set the S0 bit to make it
 655                          * branch to the stop command.
 656                          */
 657                         dma_stopped = 1;
 658                 pi->dbdma_ring.cmds[i].xfer_status = 0;
 659 
 660                 if (++i >= runtime->periods) {
 661                         i = 0;
 662                         pi->frame_count += runtime->buffer_size;
 663                 }
 664                 pi->current_period = i;
 665 
 666                 /*
 667                  * Check the frame count.  The DMA tends to get a bit
 668                  * ahead of the frame counter, which confuses the core.
 669                  */
 670                 fc = in_le32(&i2sdev->intfregs->frame_count);
 671                 nframes = i * runtime->period_size;
 672                 if (fc < pi->frame_count + nframes)
 673                         pi->frame_count = fc - nframes;
 674         }
 675 
 676         if (dma_stopped) {
 677                 timeout = 1000;
 678                 for (;;) {
 679                         status = in_le32(&pi->dbdma->status);
 680                         if (!(status & ACTIVE) && (!in || (status & 0x80)))
 681                                 break;
 682                         if (--timeout <= 0) {
 683                                 printk(KERN_ERR "i2sbus: timed out "
 684                                        "waiting for DMA to stop!\n");
 685                                 break;
 686                         }
 687                         udelay(1);
 688                 }
 689 
 690                 /* Turn off DMA controller, clear S0 bit */
 691                 out_le32(&pi->dbdma->control, (RUN | PAUSE | 1) << 16);
 692 
 693                 pi->dbdma_ring.stopping = 0;
 694                 if (pi->stop_completion)
 695                         complete(pi->stop_completion);
 696         }
 697 
 698         if (!pi->dbdma_ring.running)
 699                 goto out_unlock;
 700         spin_unlock(&i2sdev->low_lock);
 701         /* may call _trigger again, hence needs to be unlocked */
 702         snd_pcm_period_elapsed(pi->substream);
 703         return;
 704 
 705  out_unlock:
 706         spin_unlock(&i2sdev->low_lock);
 707 }
 708 
 709 irqreturn_t i2sbus_tx_intr(int irq, void *devid)
 710 {
 711         handle_interrupt((struct i2sbus_dev *)devid, 0);
 712         return IRQ_HANDLED;
 713 }
 714 
 715 irqreturn_t i2sbus_rx_intr(int irq, void *devid)
 716 {
 717         handle_interrupt((struct i2sbus_dev *)devid, 1);
 718         return IRQ_HANDLED;
 719 }
 720 
 721 static int i2sbus_playback_open(struct snd_pcm_substream *substream)
 722 {
 723         struct i2sbus_dev *i2sdev = snd_pcm_substream_chip(substream);
 724 
 725         if (!i2sdev)
 726                 return -EINVAL;
 727         i2sdev->out.substream = substream;
 728         return i2sbus_pcm_open(i2sdev, 0);
 729 }
 730 
 731 static int i2sbus_playback_close(struct snd_pcm_substream *substream)
 732 {
 733         struct i2sbus_dev *i2sdev = snd_pcm_substream_chip(substream);
 734         int err;
 735 
 736         if (!i2sdev)
 737                 return -EINVAL;
 738         if (i2sdev->out.substream != substream)
 739                 return -EINVAL;
 740         err = i2sbus_pcm_close(i2sdev, 0);
 741         if (!err)
 742                 i2sdev->out.substream = NULL;
 743         return err;
 744 }
 745 
 746 static int i2sbus_playback_prepare(struct snd_pcm_substream *substream)
 747 {
 748         struct i2sbus_dev *i2sdev = snd_pcm_substream_chip(substream);
 749 
 750         if (!i2sdev)
 751                 return -EINVAL;
 752         if (i2sdev->out.substream != substream)
 753                 return -EINVAL;
 754         return i2sbus_pcm_prepare(i2sdev, 0);
 755 }
 756 
 757 static int i2sbus_playback_trigger(struct snd_pcm_substream *substream, int cmd)
 758 {
 759         struct i2sbus_dev *i2sdev = snd_pcm_substream_chip(substream);
 760 
 761         if (!i2sdev)
 762                 return -EINVAL;
 763         if (i2sdev->out.substream != substream)
 764                 return -EINVAL;
 765         return i2sbus_pcm_trigger(i2sdev, 0, cmd);
 766 }
 767 
 768 static snd_pcm_uframes_t i2sbus_playback_pointer(struct snd_pcm_substream
 769                                                  *substream)
 770 {
 771         struct i2sbus_dev *i2sdev = snd_pcm_substream_chip(substream);
 772 
 773         if (!i2sdev)
 774                 return -EINVAL;
 775         if (i2sdev->out.substream != substream)
 776                 return 0;
 777         return i2sbus_pcm_pointer(i2sdev, 0);
 778 }
 779 
 780 static const struct snd_pcm_ops i2sbus_playback_ops = {
 781         .open =         i2sbus_playback_open,
 782         .close =        i2sbus_playback_close,
 783         .ioctl =        snd_pcm_lib_ioctl,
 784         .hw_params =    i2sbus_hw_params,
 785         .hw_free =      i2sbus_playback_hw_free,
 786         .prepare =      i2sbus_playback_prepare,
 787         .trigger =      i2sbus_playback_trigger,
 788         .pointer =      i2sbus_playback_pointer,
 789 };
 790 
 791 static int i2sbus_record_open(struct snd_pcm_substream *substream)
 792 {
 793         struct i2sbus_dev *i2sdev = snd_pcm_substream_chip(substream);
 794 
 795         if (!i2sdev)
 796                 return -EINVAL;
 797         i2sdev->in.substream = substream;
 798         return i2sbus_pcm_open(i2sdev, 1);
 799 }
 800 
 801 static int i2sbus_record_close(struct snd_pcm_substream *substream)
 802 {
 803         struct i2sbus_dev *i2sdev = snd_pcm_substream_chip(substream);
 804         int err;
 805 
 806         if (!i2sdev)
 807                 return -EINVAL;
 808         if (i2sdev->in.substream != substream)
 809                 return -EINVAL;
 810         err = i2sbus_pcm_close(i2sdev, 1);
 811         if (!err)
 812                 i2sdev->in.substream = NULL;
 813         return err;
 814 }
 815 
 816 static int i2sbus_record_prepare(struct snd_pcm_substream *substream)
 817 {
 818         struct i2sbus_dev *i2sdev = snd_pcm_substream_chip(substream);
 819 
 820         if (!i2sdev)
 821                 return -EINVAL;
 822         if (i2sdev->in.substream != substream)
 823                 return -EINVAL;
 824         return i2sbus_pcm_prepare(i2sdev, 1);
 825 }
 826 
 827 static int i2sbus_record_trigger(struct snd_pcm_substream *substream, int cmd)
 828 {
 829         struct i2sbus_dev *i2sdev = snd_pcm_substream_chip(substream);
 830 
 831         if (!i2sdev)
 832                 return -EINVAL;
 833         if (i2sdev->in.substream != substream)
 834                 return -EINVAL;
 835         return i2sbus_pcm_trigger(i2sdev, 1, cmd);
 836 }
 837 
 838 static snd_pcm_uframes_t i2sbus_record_pointer(struct snd_pcm_substream
 839                                                *substream)
 840 {
 841         struct i2sbus_dev *i2sdev = snd_pcm_substream_chip(substream);
 842 
 843         if (!i2sdev)
 844                 return -EINVAL;
 845         if (i2sdev->in.substream != substream)
 846                 return 0;
 847         return i2sbus_pcm_pointer(i2sdev, 1);
 848 }
 849 
 850 static const struct snd_pcm_ops i2sbus_record_ops = {
 851         .open =         i2sbus_record_open,
 852         .close =        i2sbus_record_close,
 853         .ioctl =        snd_pcm_lib_ioctl,
 854         .hw_params =    i2sbus_hw_params,
 855         .hw_free =      i2sbus_record_hw_free,
 856         .prepare =      i2sbus_record_prepare,
 857         .trigger =      i2sbus_record_trigger,
 858         .pointer =      i2sbus_record_pointer,
 859 };
 860 
 861 static void i2sbus_private_free(struct snd_pcm *pcm)
 862 {
 863         struct i2sbus_dev *i2sdev = snd_pcm_chip(pcm);
 864         struct codec_info_item *p, *tmp;
 865 
 866         i2sdev->sound.pcm = NULL;
 867         i2sdev->out.created = 0;
 868         i2sdev->in.created = 0;
 869         list_for_each_entry_safe(p, tmp, &i2sdev->sound.codec_list, list) {
 870                 printk(KERN_ERR "i2sbus: a codec didn't unregister!\n");
 871                 list_del(&p->list);
 872                 module_put(p->codec->owner);
 873                 kfree(p);
 874         }
 875         soundbus_dev_put(&i2sdev->sound);
 876         module_put(THIS_MODULE);
 877 }
 878 
 879 int
 880 i2sbus_attach_codec(struct soundbus_dev *dev, struct snd_card *card,
 881                     struct codec_info *ci, void *data)
 882 {
 883         int err, in = 0, out = 0;
 884         struct transfer_info *tmp;
 885         struct i2sbus_dev *i2sdev = soundbus_dev_to_i2sbus_dev(dev);
 886         struct codec_info_item *cii;
 887 
 888         if (!dev->pcmname || dev->pcmid == -1) {
 889                 printk(KERN_ERR "i2sbus: pcm name and id must be set!\n");
 890                 return -EINVAL;
 891         }
 892 
 893         list_for_each_entry(cii, &dev->codec_list, list) {
 894                 if (cii->codec_data == data)
 895                         return -EALREADY;
 896         }
 897 
 898         if (!ci->transfers || !ci->transfers->formats
 899             || !ci->transfers->rates || !ci->usable)
 900                 return -EINVAL;
 901 
 902         /* we currently code the i2s transfer on the clock, and support only
 903          * 32 and 64 */
 904         if (ci->bus_factor != 32 && ci->bus_factor != 64)
 905                 return -EINVAL;
 906 
 907         /* If you want to fix this, you need to keep track of what transport infos
 908          * are to be used, which codecs they belong to, and then fix all the
 909          * sysclock/busclock stuff above to depend on which is usable */
 910         list_for_each_entry(cii, &dev->codec_list, list) {
 911                 if (cii->codec->sysclock_factor != ci->sysclock_factor) {
 912                         printk(KERN_DEBUG
 913                                "cannot yet handle multiple different sysclocks!\n");
 914                         return -EINVAL;
 915                 }
 916                 if (cii->codec->bus_factor != ci->bus_factor) {
 917                         printk(KERN_DEBUG
 918                                "cannot yet handle multiple different bus clocks!\n");
 919                         return -EINVAL;
 920                 }
 921         }
 922 
 923         tmp = ci->transfers;
 924         while (tmp->formats && tmp->rates) {
 925                 if (tmp->transfer_in)
 926                         in = 1;
 927                 else
 928                         out = 1;
 929                 tmp++;
 930         }
 931 
 932         cii = kzalloc(sizeof(struct codec_info_item), GFP_KERNEL);
 933         if (!cii) {
 934                 printk(KERN_DEBUG "i2sbus: failed to allocate cii\n");
 935                 return -ENOMEM;
 936         }
 937 
 938         /* use the private data to point to the codec info */
 939         cii->sdev = soundbus_dev_get(dev);
 940         cii->codec = ci;
 941         cii->codec_data = data;
 942 
 943         if (!cii->sdev) {
 944                 printk(KERN_DEBUG
 945                        "i2sbus: failed to get soundbus dev reference\n");
 946                 err = -ENODEV;
 947                 goto out_free_cii;
 948         }
 949 
 950         if (!try_module_get(THIS_MODULE)) {
 951                 printk(KERN_DEBUG "i2sbus: failed to get module reference!\n");
 952                 err = -EBUSY;
 953                 goto out_put_sdev;
 954         }
 955 
 956         if (!try_module_get(ci->owner)) {
 957                 printk(KERN_DEBUG
 958                        "i2sbus: failed to get module reference to codec owner!\n");
 959                 err = -EBUSY;
 960                 goto out_put_this_module;
 961         }
 962 
 963         if (!dev->pcm) {
 964                 err = snd_pcm_new(card, dev->pcmname, dev->pcmid, 0, 0,
 965                                   &dev->pcm);
 966                 if (err) {
 967                         printk(KERN_DEBUG "i2sbus: failed to create pcm\n");
 968                         goto out_put_ci_module;
 969                 }
 970         }
 971 
 972         /* ALSA yet again sucks.
 973          * If it is ever fixed, remove this line. See below. */
 974         out = in = 1;
 975 
 976         if (!i2sdev->out.created && out) {
 977                 if (dev->pcm->card != card) {
 978                         /* eh? */
 979                         printk(KERN_ERR
 980                                "Can't attach same bus to different cards!\n");
 981                         err = -EINVAL;
 982                         goto out_put_ci_module;
 983                 }
 984                 err = snd_pcm_new_stream(dev->pcm, SNDRV_PCM_STREAM_PLAYBACK, 1);
 985                 if (err)
 986                         goto out_put_ci_module;
 987                 snd_pcm_set_ops(dev->pcm, SNDRV_PCM_STREAM_PLAYBACK,
 988                                 &i2sbus_playback_ops);
 989                 dev->pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].dev.parent =
 990                         &dev->ofdev.dev;
 991                 i2sdev->out.created = 1;
 992         }
 993 
 994         if (!i2sdev->in.created && in) {
 995                 if (dev->pcm->card != card) {
 996                         printk(KERN_ERR
 997                                "Can't attach same bus to different cards!\n");
 998                         err = -EINVAL;
 999                         goto out_put_ci_module;
1000                 }
1001                 err = snd_pcm_new_stream(dev->pcm, SNDRV_PCM_STREAM_CAPTURE, 1);
1002                 if (err)
1003                         goto out_put_ci_module;
1004                 snd_pcm_set_ops(dev->pcm, SNDRV_PCM_STREAM_CAPTURE,
1005                                 &i2sbus_record_ops);
1006                 dev->pcm->streams[SNDRV_PCM_STREAM_CAPTURE].dev.parent =
1007                         &dev->ofdev.dev;
1008                 i2sdev->in.created = 1;
1009         }
1010 
1011         /* so we have to register the pcm after adding any substream
1012          * to it because alsa doesn't create the devices for the
1013          * substreams when we add them later.
1014          * Therefore, force in and out on both busses (above) and
1015          * register the pcm now instead of just after creating it.
1016          */
1017         err = snd_device_register(card, dev->pcm);
1018         if (err) {
1019                 printk(KERN_ERR "i2sbus: error registering new pcm\n");
1020                 goto out_put_ci_module;
1021         }
1022         /* no errors any more, so let's add this to our list */
1023         list_add(&cii->list, &dev->codec_list);
1024 
1025         dev->pcm->private_data = i2sdev;
1026         dev->pcm->private_free = i2sbus_private_free;
1027 
1028         /* well, we really should support scatter/gather DMA */
1029         snd_pcm_lib_preallocate_pages_for_all(
1030                 dev->pcm, SNDRV_DMA_TYPE_DEV,
1031                 snd_dma_pci_data(macio_get_pci_dev(i2sdev->macio)),
1032                 64 * 1024, 64 * 1024);
1033 
1034         return 0;
1035  out_put_ci_module:
1036         module_put(ci->owner);
1037  out_put_this_module:
1038         module_put(THIS_MODULE);
1039  out_put_sdev:
1040         soundbus_dev_put(dev);
1041  out_free_cii:
1042         kfree(cii);
1043         return err;
1044 }
1045 
1046 void i2sbus_detach_codec(struct soundbus_dev *dev, void *data)
1047 {
1048         struct codec_info_item *cii = NULL, *i;
1049 
1050         list_for_each_entry(i, &dev->codec_list, list) {
1051                 if (i->codec_data == data) {
1052                         cii = i;
1053                         break;
1054                 }
1055         }
1056         if (cii) {
1057                 list_del(&cii->list);
1058                 module_put(cii->codec->owner);
1059                 kfree(cii);
1060         }
1061         /* no more codecs, but still a pcm? */
1062         if (list_empty(&dev->codec_list) && dev->pcm) {
1063                 /* the actual cleanup is done by the callback above! */
1064                 snd_device_free(dev->pcm->card, dev->pcm);
1065         }
1066 }
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root/sound/aoa/soundbus/i2sbus/pcm.c

DEFINITIONS
