sound/soc/au1x/dbdma2.c

   1 /*
   2  * Au12x0/Au1550 PSC ALSA ASoC audio support.
   3  *
   4  * (c) 2007-2008 MSC Vertriebsges.m.b.H.,
   5  *      Manuel Lauss <manuel.lauss@gmail.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  *
  11  * DMA glue for Au1x-PSC audio.
  12  *
  13  */
  14
  15
  16 #include <linux/module.h>
  17 #include <linux/init.h>
  18 #include <linux/platform_device.h>
  19 #include <linux/slab.h>
  20 #include <linux/dma-mapping.h>
  21
  22 #include <sound/core.h>
  23 #include <sound/pcm.h>
  24 #include <sound/pcm_params.h>
  25 #include <sound/soc.h>
  26
  27 #include <asm/mach-au1x00/au1000.h>
  28 #include <asm/mach-au1x00/au1xxx_dbdma.h>
  29 #include <asm/mach-au1x00/au1xxx_psc.h>
  30
  31 #include "psc.h"
  32
  33 /*#define PCM_DEBUG*/
  34
  35 #define MSG(x...)       printk(KERN_INFO "au1xpsc_pcm: " x)
  36 #ifdef PCM_DEBUG
  37 #define DBG             MSG
  38 #else
  39 #define DBG(x...)       do {} while (0)
  40 #endif
  41
  42 struct au1xpsc_audio_dmadata {
  43         /* DDMA control data */
  44         unsigned int ddma_id;           /* DDMA direction ID for this PSC */
  45         u32 ddma_chan;                  /* DDMA context */
  46
  47         /* PCM context (for irq handlers) */
  48         struct snd_pcm_substream *substream;
  49         unsigned long curr_period;      /* current segment DDMA is working on */
  50         unsigned long q_period;         /* queue period(s) */
  51         dma_addr_t dma_area;            /* address of queued DMA area */
  52         dma_addr_t dma_area_s;          /* start address of DMA area */
  53         unsigned long pos;              /* current byte position being played */
  54         unsigned long periods;          /* number of SG segments in total */
  55         unsigned long period_bytes;     /* size in bytes of one SG segment */
  56
  57         /* runtime data */
  58         int msbits;
  59 };
  60
  61 /*
  62  * These settings are somewhat okay, at least on my machine audio plays
  63  * almost skip-free. Especially the 64kB buffer seems to help a LOT.
  64  */
  65 #define AU1XPSC_PERIOD_MIN_BYTES        1024
  66 #define AU1XPSC_BUFFER_MIN_BYTES        65536
  67
  68 #define AU1XPSC_PCM_FMTS                                        \
  69         (SNDRV_PCM_FMTBIT_S8     | SNDRV_PCM_FMTBIT_U8 |        \
  70          SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S16_BE |    \
  71          SNDRV_PCM_FMTBIT_U16_LE | SNDRV_PCM_FMTBIT_U16_BE |    \
  72          SNDRV_PCM_FMTBIT_S32_LE | SNDRV_PCM_FMTBIT_S32_BE |    \
  73          SNDRV_PCM_FMTBIT_U32_LE | SNDRV_PCM_FMTBIT_U32_BE |    \
  74          0)
  75
  76 /* PCM hardware DMA capabilities - platform specific */
  77 static const struct snd_pcm_hardware au1xpsc_pcm_hardware = {
  78         .info             = SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID |
  79                             SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BATCH,
  80         .formats          = AU1XPSC_PCM_FMTS,
  81         .period_bytes_min = AU1XPSC_PERIOD_MIN_BYTES,
  82         .period_bytes_max = 4096 * 1024 - 1,
  83         .periods_min      = 2,
  84         .periods_max      = 4096,       /* 2 to as-much-as-you-like */
  85         .buffer_bytes_max = 4096 * 1024 - 1,
  86         .fifo_size        = 16,         /* fifo entries of AC97/I2S PSC */
  87 };
  88
  89 static void au1x_pcm_queue_tx(struct au1xpsc_audio_dmadata *cd)
  90 {
  91         au1xxx_dbdma_put_source(cd->ddma_chan, cd->dma_area,
  92                                 cd->period_bytes, DDMA_FLAGS_IE);
  93
  94         /* update next-to-queue period */
  95         ++cd->q_period;
  96         cd->dma_area += cd->period_bytes;
  97         if (cd->q_period >= cd->periods) {
  98                 cd->q_period = 0;
  99                 cd->dma_area = cd->dma_area_s;
 100         }
 101 }
 102
 103 static void au1x_pcm_queue_rx(struct au1xpsc_audio_dmadata *cd)
 104 {
 105         au1xxx_dbdma_put_dest(cd->ddma_chan, cd->dma_area,
 106                               cd->period_bytes, DDMA_FLAGS_IE);
 107
 108         /* update next-to-queue period */
 109         ++cd->q_period;
 110         cd->dma_area += cd->period_bytes;
 111         if (cd->q_period >= cd->periods) {
 112                 cd->q_period = 0;
 113                 cd->dma_area = cd->dma_area_s;
 114         }
 115 }
 116
 117 static void au1x_pcm_dmatx_cb(int irq, void *dev_id)
 118 {
 119         struct au1xpsc_audio_dmadata *cd = dev_id;
 120
 121         cd->pos += cd->period_bytes;
 122         if (++cd->curr_period >= cd->periods) {
 123                 cd->pos = 0;
 124                 cd->curr_period = 0;
 125         }
 126         snd_pcm_period_elapsed(cd->substream);
 127         au1x_pcm_queue_tx(cd);
 128 }
 129
 130 static void au1x_pcm_dmarx_cb(int irq, void *dev_id)
 131 {
 132         struct au1xpsc_audio_dmadata *cd = dev_id;
 133
 134         cd->pos += cd->period_bytes;
 135         if (++cd->curr_period >= cd->periods) {
 136                 cd->pos = 0;
 137                 cd->curr_period = 0;
 138         }
 139         snd_pcm_period_elapsed(cd->substream);
 140         au1x_pcm_queue_rx(cd);
 141 }
 142
 143 static void au1x_pcm_dbdma_free(struct au1xpsc_audio_dmadata *pcd)
 144 {
 145         if (pcd->ddma_chan) {
 146                 au1xxx_dbdma_stop(pcd->ddma_chan);
 147                 au1xxx_dbdma_reset(pcd->ddma_chan);
 148                 au1xxx_dbdma_chan_free(pcd->ddma_chan);
 149                 pcd->ddma_chan = 0;
 150                 pcd->msbits = 0;
 151         }
 152 }
 153
 154 /* in case of missing DMA ring or changed TX-source / RX-dest bit widths,
 155  * allocate (or reallocate) a 2-descriptor DMA ring with bit depth according
 156  * to ALSA-supplied sample depth.  This is due to limitations in the dbdma api
 157  * (cannot adjust source/dest widths of already allocated descriptor ring).
 158  */
 159 static int au1x_pcm_dbdma_realloc(struct au1xpsc_audio_dmadata *pcd,
 160                                  int stype, int msbits)
 161 {
 162         /* DMA only in 8/16/32 bit widths */
 163         if (msbits == 24)
 164                 msbits = 32;
 165
 166         /* check current config: correct bits and descriptors allocated? */
 167         if ((pcd->ddma_chan) && (msbits == pcd->msbits))
 168                 goto out;       /* all ok! */
 169
 170         au1x_pcm_dbdma_free(pcd);
 171
 172         if (stype == SNDRV_PCM_STREAM_CAPTURE)
 173                 pcd->ddma_chan = au1xxx_dbdma_chan_alloc(pcd->ddma_id,
 174                                         DSCR_CMD0_ALWAYS,
 175                                         au1x_pcm_dmarx_cb, (void *)pcd);
 176         else
 177                 pcd->ddma_chan = au1xxx_dbdma_chan_alloc(DSCR_CMD0_ALWAYS,
 178                                         pcd->ddma_id,
 179                                         au1x_pcm_dmatx_cb, (void *)pcd);
 180
 181         if (!pcd->ddma_chan)
 182                 return -ENOMEM;
 183
 184         au1xxx_dbdma_set_devwidth(pcd->ddma_chan, msbits);
 185         au1xxx_dbdma_ring_alloc(pcd->ddma_chan, 2);
 186
 187         pcd->msbits = msbits;
 188
 189         au1xxx_dbdma_stop(pcd->ddma_chan);
 190         au1xxx_dbdma_reset(pcd->ddma_chan);
 191
 192 out:
 193         return 0;
 194 }
 195
 196 static inline struct au1xpsc_audio_dmadata *to_dmadata(struct snd_pcm_substream *ss)
 197 {
 198         struct snd_soc_pcm_runtime *rtd = ss->private_data;
 199         struct au1xpsc_audio_dmadata *pcd =
 200                                 snd_soc_platform_get_drvdata(rtd->platform);
 201         return &pcd[ss->stream];
 202 }
 203
 204 static int au1xpsc_pcm_hw_params(struct snd_pcm_substream *substream,
 205                                  struct snd_pcm_hw_params *params)
 206 {
 207         struct snd_pcm_runtime *runtime = substream->runtime;
 208         struct au1xpsc_audio_dmadata *pcd;
 209         int stype, ret;
 210
 211         ret = snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(params));
 212         if (ret < 0)
 213                 goto out;
 214
 215         stype = substream->stream;
 216         pcd = to_dmadata(substream);
 217
 218         DBG("runtime->dma_area = 0x%08lx dma_addr_t = 0x%08lx dma_size = %d "
 219             "runtime->min_align %d\n",
 220                 (unsigned long)runtime->dma_area,
 221                 (unsigned long)runtime->dma_addr, runtime->dma_bytes,
 222                 runtime->min_align);
 223
 224         DBG("bits %d  frags %d  frag_bytes %d  is_rx %d\n", params->msbits,
 225                 params_periods(params), params_period_bytes(params), stype);
 226
 227         ret = au1x_pcm_dbdma_realloc(pcd, stype, params->msbits);
 228         if (ret) {
 229                 MSG("DDMA channel (re)alloc failed!\n");
 230                 goto out;
 231         }
 232
 233         pcd->substream = substream;
 234         pcd->period_bytes = params_period_bytes(params);
 235         pcd->periods = params_periods(params);
 236         pcd->dma_area_s = pcd->dma_area = runtime->dma_addr;
 237         pcd->q_period = 0;
 238         pcd->curr_period = 0;
 239         pcd->pos = 0;
 240
 241         ret = 0;
 242 out:
 243         return ret;
 244 }
 245
 246 static int au1xpsc_pcm_hw_free(struct snd_pcm_substream *substream)
 247 {
 248         snd_pcm_lib_free_pages(substream);
 249         return 0;
 250 }
 251
 252 static int au1xpsc_pcm_prepare(struct snd_pcm_substream *substream)
 253 {
 254         struct au1xpsc_audio_dmadata *pcd = to_dmadata(substream);
 255
 256         au1xxx_dbdma_reset(pcd->ddma_chan);
 257
 258         if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
 259                 au1x_pcm_queue_rx(pcd);
 260                 au1x_pcm_queue_rx(pcd);
 261         } else {
 262                 au1x_pcm_queue_tx(pcd);
 263                 au1x_pcm_queue_tx(pcd);
 264         }
 265
 266         return 0;
 267 }
 268
 269 static int au1xpsc_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 270 {
 271         u32 c = to_dmadata(substream)->ddma_chan;
 272
 273         switch (cmd) {
 274         case SNDRV_PCM_TRIGGER_START:
 275         case SNDRV_PCM_TRIGGER_RESUME:
 276                 au1xxx_dbdma_start(c);
 277                 break;
 278         case SNDRV_PCM_TRIGGER_STOP:
 279         case SNDRV_PCM_TRIGGER_SUSPEND:
 280                 au1xxx_dbdma_stop(c);
 281                 break;
 282         default:
 283                 return -EINVAL;
 284         }
 285         return 0;
 286 }
 287
 288 static snd_pcm_uframes_t
 289 au1xpsc_pcm_pointer(struct snd_pcm_substream *substream)
 290 {
 291         return bytes_to_frames(substream->runtime, to_dmadata(substream)->pos);
 292 }
 293
 294 static int au1xpsc_pcm_open(struct snd_pcm_substream *substream)
 295 {
 296         struct au1xpsc_audio_dmadata *pcd = to_dmadata(substream);
 297         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 298         int stype = substream->stream, *dmaids;
 299
 300         dmaids = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
 301         if (!dmaids)
 302                 return -ENODEV; /* whoa, has ordering changed? */
 303
 304         pcd->ddma_id = dmaids[stype];
 305
 306         snd_soc_set_runtime_hwparams(substream, &au1xpsc_pcm_hardware);
 307         return 0;
 308 }
 309
 310 static int au1xpsc_pcm_close(struct snd_pcm_substream *substream)
 311 {
 312         au1x_pcm_dbdma_free(to_dmadata(substream));
 313         return 0;
 314 }
 315
 316 static struct snd_pcm_ops au1xpsc_pcm_ops = {
 317         .open           = au1xpsc_pcm_open,
 318         .close          = au1xpsc_pcm_close,
 319         .ioctl          = snd_pcm_lib_ioctl,
 320         .hw_params      = au1xpsc_pcm_hw_params,
 321         .hw_free        = au1xpsc_pcm_hw_free,
 322         .prepare        = au1xpsc_pcm_prepare,
 323         .trigger        = au1xpsc_pcm_trigger,
 324         .pointer        = au1xpsc_pcm_pointer,
 325 };
 326
 327 static void au1xpsc_pcm_free_dma_buffers(struct snd_pcm *pcm)
 328 {
 329         snd_pcm_lib_preallocate_free_for_all(pcm);
 330 }
 331
 332 static int au1xpsc_pcm_new(struct snd_soc_pcm_runtime *rtd)
 333 {
 334         struct snd_card *card = rtd->card->snd_card;
 335         struct snd_pcm *pcm = rtd->pcm;
 336
 337         snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
 338                 card->dev, AU1XPSC_BUFFER_MIN_BYTES, (4096 * 1024) - 1);
 339
 340         return 0;
 341 }
 342
 343 /* au1xpsc audio platform */
 344 static struct snd_soc_platform_driver au1xpsc_soc_platform = {
 345         .ops            = &au1xpsc_pcm_ops,
 346         .pcm_new        = au1xpsc_pcm_new,
 347         .pcm_free       = au1xpsc_pcm_free_dma_buffers,
 348 };
 349
 350 static int au1xpsc_pcm_drvprobe(struct platform_device *pdev)
 351 {
 352         struct au1xpsc_audio_dmadata *dmadata;
 353
 354         dmadata = devm_kzalloc(&pdev->dev,
 355                                2 * sizeof(struct au1xpsc_audio_dmadata),
 356                                GFP_KERNEL);
 357         if (!dmadata)
 358                 return -ENOMEM;
 359
 360         platform_set_drvdata(pdev, dmadata);
 361
 362         return snd_soc_register_platform(&pdev->dev, &au1xpsc_soc_platform);
 363 }
 364
 365 static int au1xpsc_pcm_drvremove(struct platform_device *pdev)
 366 {
 367         snd_soc_unregister_platform(&pdev->dev);
 368
 369         return 0;
 370 }
 371
 372 static struct platform_driver au1xpsc_pcm_driver = {
 373         .driver = {
 374                 .name   = "au1xpsc-pcm",
 375                 .owner  = THIS_MODULE,
 376         },
 377         .probe          = au1xpsc_pcm_drvprobe,
 378         .remove         = au1xpsc_pcm_drvremove,
 379 };
 380
 381 module_platform_driver(au1xpsc_pcm_driver);
 382
 383 MODULE_LICENSE("GPL");
 384 MODULE_DESCRIPTION("Au12x0/Au1550 PSC Audio DMA driver");
 385 MODULE_AUTHOR("Manuel Lauss");