sound/soc/samsung/idma.c

   1 /*
   2  * sound/soc/samsung/idma.c
   3  *
   4  * Copyright (c) 2011 Samsung Electronics Co., Ltd.
   5  *              http://www.samsung.com
   6  *
   7  * I2S0's Internal DMA driver
   8  *
   9  * This program is free software; you can redistribute  it and/or modify it
  10  * under  the terms of  the GNU General  Public License as published by the
  11  * Free Software Foundation;  either version 2 of the  License, or (at your
  12  * option) any later version.
  13  */
  14 #include <linux/interrupt.h>
  15 #include <linux/platform_device.h>
  16 #include <linux/dma-mapping.h>
  17 #include <linux/slab.h>
  18 #include <linux/module.h>
  19 #include <sound/pcm.h>
  20 #include <sound/pcm_params.h>
  21 #include <sound/soc.h>
  22
  23 #include "i2s.h"
  24 #include "idma.h"
  25 #include "dma.h"
  26 #include "i2s-regs.h"
  27
  28 #define ST_RUNNING              (1<<0)
  29 #define ST_OPENED               (1<<1)
  30
  31 static const struct snd_pcm_hardware idma_hardware = {
  32         .info = SNDRV_PCM_INFO_INTERLEAVED |
  33                     SNDRV_PCM_INFO_BLOCK_TRANSFER |
  34                     SNDRV_PCM_INFO_MMAP |
  35                     SNDRV_PCM_INFO_MMAP_VALID |
  36                     SNDRV_PCM_INFO_PAUSE |
  37                     SNDRV_PCM_INFO_RESUME,
  38         .formats = SNDRV_PCM_FMTBIT_S16_LE |
  39                     SNDRV_PCM_FMTBIT_U16_LE |
  40                     SNDRV_PCM_FMTBIT_S24_LE |
  41                     SNDRV_PCM_FMTBIT_U24_LE |
  42                     SNDRV_PCM_FMTBIT_U8 |
  43                     SNDRV_PCM_FMTBIT_S8,
  44         .channels_min = 2,
  45         .channels_max = 2,
  46         .buffer_bytes_max = MAX_IDMA_BUFFER,
  47         .period_bytes_min = 128,
  48         .period_bytes_max = MAX_IDMA_PERIOD,
  49         .periods_min = 1,
  50         .periods_max = 2,
  51 };
  52
  53 struct idma_ctrl {
  54         spinlock_t      lock;
  55         int             state;
  56         dma_addr_t      start;
  57         dma_addr_t      pos;
  58         dma_addr_t      end;
  59         dma_addr_t      period;
  60         dma_addr_t      periodsz;
  61         void            *token;
  62         void            (*cb)(void *dt, int bytes_xfer);
  63 };
  64
  65 static struct idma_info {
  66         spinlock_t      lock;
  67         void             __iomem  *regs;
  68         dma_addr_t      lp_tx_addr;
  69 } idma;
  70
  71 static int idma_irq;
  72
  73 static void idma_getpos(dma_addr_t *src)
  74 {
  75         *src = idma.lp_tx_addr +
  76                 (readl(idma.regs + I2STRNCNT) & 0xffffff) * 4;
  77 }
  78
  79 static int idma_enqueue(struct snd_pcm_substream *substream)
  80 {
  81         struct snd_pcm_runtime *runtime = substream->runtime;
  82         struct idma_ctrl *prtd = substream->runtime->private_data;
  83         u32 val;
  84
  85         spin_lock(&prtd->lock);
  86         prtd->token = (void *) substream;
  87         spin_unlock(&prtd->lock);
  88
  89         /* Internal DMA Level0 Interrupt Address */
  90         val = idma.lp_tx_addr + prtd->periodsz;
  91         writel(val, idma.regs + I2SLVL0ADDR);
  92
  93         /* Start address0 of I2S internal DMA operation. */
  94         val = idma.lp_tx_addr;
  95         writel(val, idma.regs + I2SSTR0);
  96
  97         /*
  98          * Transfer block size for I2S internal DMA.
  99          * Should decide transfer size before start dma operation
 100          */
 101         val = readl(idma.regs + I2SSIZE);
 102         val &= ~(I2SSIZE_TRNMSK << I2SSIZE_SHIFT);
 103         val |= (((runtime->dma_bytes >> 2) &
 104                         I2SSIZE_TRNMSK) << I2SSIZE_SHIFT);
 105         writel(val, idma.regs + I2SSIZE);
 106
 107         val = readl(idma.regs + I2SAHB);
 108         val |= AHB_INTENLVL0;
 109         writel(val, idma.regs + I2SAHB);
 110
 111         return 0;
 112 }
 113
 114 static void idma_setcallbk(struct snd_pcm_substream *substream,
 115                                 void (*cb)(void *, int))
 116 {
 117         struct idma_ctrl *prtd = substream->runtime->private_data;
 118
 119         spin_lock(&prtd->lock);
 120         prtd->cb = cb;
 121         spin_unlock(&prtd->lock);
 122 }
 123
 124 static void idma_control(int op)
 125 {
 126         u32 val = readl(idma.regs + I2SAHB);
 127
 128         spin_lock(&idma.lock);
 129
 130         switch (op) {
 131         case LPAM_DMA_START:
 132                 val |= (AHB_INTENLVL0 | AHB_DMAEN);
 133                 break;
 134         case LPAM_DMA_STOP:
 135                 val &= ~(AHB_INTENLVL0 | AHB_DMAEN);
 136                 break;
 137         default:
 138                 spin_unlock(&idma.lock);
 139                 return;
 140         }
 141
 142         writel(val, idma.regs + I2SAHB);
 143         spin_unlock(&idma.lock);
 144 }
 145
 146 static void idma_done(void *id, int bytes_xfer)
 147 {
 148         struct snd_pcm_substream *substream = id;
 149         struct idma_ctrl *prtd = substream->runtime->private_data;
 150
 151         if (prtd && (prtd->state & ST_RUNNING))
 152                 snd_pcm_period_elapsed(substream);
 153 }
 154
 155 static int idma_hw_params(struct snd_pcm_substream *substream,
 156                                 struct snd_pcm_hw_params *params)
 157 {
 158         struct snd_pcm_runtime *runtime = substream->runtime;
 159         struct idma_ctrl *prtd = substream->runtime->private_data;
 160         u32 mod = readl(idma.regs + I2SMOD);
 161         u32 ahb = readl(idma.regs + I2SAHB);
 162
 163         ahb |= (AHB_DMARLD | AHB_INTMASK);
 164         mod |= MOD_TXS_IDMA;
 165         writel(ahb, idma.regs + I2SAHB);
 166         writel(mod, idma.regs + I2SMOD);
 167
 168         snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
 169         runtime->dma_bytes = params_buffer_bytes(params);
 170
 171         prtd->start = prtd->pos = runtime->dma_addr;
 172         prtd->period = params_periods(params);
 173         prtd->periodsz = params_period_bytes(params);
 174         prtd->end = runtime->dma_addr + runtime->dma_bytes;
 175
 176         idma_setcallbk(substream, idma_done);
 177
 178         return 0;
 179 }
 180
 181 static int idma_hw_free(struct snd_pcm_substream *substream)
 182 {
 183         snd_pcm_set_runtime_buffer(substream, NULL);
 184
 185         return 0;
 186 }
 187
 188 static int idma_prepare(struct snd_pcm_substream *substream)
 189 {
 190         struct idma_ctrl *prtd = substream->runtime->private_data;
 191
 192         prtd->pos = prtd->start;
 193
 194         /* flush the DMA channel */
 195         idma_control(LPAM_DMA_STOP);
 196         idma_enqueue(substream);
 197
 198         return 0;
 199 }
 200
 201 static int idma_trigger(struct snd_pcm_substream *substream, int cmd)
 202 {
 203         struct idma_ctrl *prtd = substream->runtime->private_data;
 204         int ret = 0;
 205
 206         spin_lock(&prtd->lock);
 207
 208         switch (cmd) {
 209         case SNDRV_PCM_TRIGGER_RESUME:
 210         case SNDRV_PCM_TRIGGER_START:
 211         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 212                 prtd->state |= ST_RUNNING;
 213                 idma_control(LPAM_DMA_START);
 214                 break;
 215
 216         case SNDRV_PCM_TRIGGER_SUSPEND:
 217         case SNDRV_PCM_TRIGGER_STOP:
 218         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 219                 prtd->state &= ~ST_RUNNING;
 220                 idma_control(LPAM_DMA_STOP);
 221                 break;
 222
 223         default:
 224                 ret = -EINVAL;
 225                 break;
 226         }
 227
 228         spin_unlock(&prtd->lock);
 229
 230         return ret;
 231 }
 232
 233 static snd_pcm_uframes_t
 234         idma_pointer(struct snd_pcm_substream *substream)
 235 {
 236         struct snd_pcm_runtime *runtime = substream->runtime;
 237         struct idma_ctrl *prtd = runtime->private_data;
 238         dma_addr_t src;
 239         unsigned long res;
 240
 241         spin_lock(&prtd->lock);
 242
 243         idma_getpos(&src);
 244         res = src - prtd->start;
 245
 246         spin_unlock(&prtd->lock);
 247
 248         return bytes_to_frames(substream->runtime, res);
 249 }
 250
 251 static int idma_mmap(struct snd_pcm_substream *substream,
 252         struct vm_area_struct *vma)
 253 {
 254         struct snd_pcm_runtime *runtime = substream->runtime;
 255         unsigned long size, offset;
 256         int ret;
 257
 258         /* From snd_pcm_lib_mmap_iomem */
 259         vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
 260         vma->vm_flags |= VM_IO;
 261         size = vma->vm_end - vma->vm_start;
 262         offset = vma->vm_pgoff << PAGE_SHIFT;
 263         ret = io_remap_pfn_range(vma, vma->vm_start,
 264                         (runtime->dma_addr + offset) >> PAGE_SHIFT,
 265                         size, vma->vm_page_prot);
 266
 267         return ret;
 268 }
 269
 270 static irqreturn_t iis_irq(int irqno, void *dev_id)
 271 {
 272         struct idma_ctrl *prtd = (struct idma_ctrl *)dev_id;
 273         u32 iiscon, iisahb, val, addr;
 274
 275         iisahb  = readl(idma.regs + I2SAHB);
 276         iiscon  = readl(idma.regs + I2SCON);
 277
 278         val = (iisahb & AHB_LVL0INT) ? AHB_CLRLVL0INT : 0;
 279
 280         if (val) {
 281                 iisahb |= val;
 282                 writel(iisahb, idma.regs + I2SAHB);
 283
 284                 addr = readl(idma.regs + I2SLVL0ADDR) - idma.lp_tx_addr;
 285                 addr += prtd->periodsz;
 286                 addr %= (prtd->end - prtd->start);
 287                 addr += idma.lp_tx_addr;
 288
 289                 writel(addr, idma.regs + I2SLVL0ADDR);
 290
 291                 if (prtd->cb)
 292                         prtd->cb(prtd->token, prtd->period);
 293         }
 294
 295         return IRQ_HANDLED;
 296 }
 297
 298 static int idma_open(struct snd_pcm_substream *substream)
 299 {
 300         struct snd_pcm_runtime *runtime = substream->runtime;
 301         struct idma_ctrl *prtd;
 302         int ret;
 303
 304         snd_soc_set_runtime_hwparams(substream, &idma_hardware);
 305
 306         prtd = kzalloc(sizeof(struct idma_ctrl), GFP_KERNEL);
 307         if (prtd == NULL)
 308                 return -ENOMEM;
 309
 310         ret = request_irq(idma_irq, iis_irq, 0, "i2s", prtd);
 311         if (ret < 0) {
 312                 pr_err("fail to claim i2s irq , ret = %d\n", ret);
 313                 kfree(prtd);
 314                 return ret;
 315         }
 316
 317         spin_lock_init(&prtd->lock);
 318
 319         runtime->private_data = prtd;
 320
 321         return 0;
 322 }
 323
 324 static int idma_close(struct snd_pcm_substream *substream)
 325 {
 326         struct snd_pcm_runtime *runtime = substream->runtime;
 327         struct idma_ctrl *prtd = runtime->private_data;
 328
 329         free_irq(idma_irq, prtd);
 330
 331         if (!prtd)
 332                 pr_err("idma_close called with prtd == NULL\n");
 333
 334         kfree(prtd);
 335
 336         return 0;
 337 }
 338
 339 static struct snd_pcm_ops idma_ops = {
 340         .open           = idma_open,
 341         .close          = idma_close,
 342         .ioctl          = snd_pcm_lib_ioctl,
 343         .trigger        = idma_trigger,
 344         .pointer        = idma_pointer,
 345         .mmap           = idma_mmap,
 346         .hw_params      = idma_hw_params,
 347         .hw_free        = idma_hw_free,
 348         .prepare        = idma_prepare,
 349 };
 350
 351 static void idma_free(struct snd_pcm *pcm)
 352 {
 353         struct snd_pcm_substream *substream;
 354         struct snd_dma_buffer *buf;
 355
 356         substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream;
 357         if (!substream)
 358                 return;
 359
 360         buf = &substream->dma_buffer;
 361         if (!buf->area)
 362                 return;
 363
 364         iounmap(buf->area);
 365
 366         buf->area = NULL;
 367         buf->addr = 0;
 368 }
 369
 370 static int preallocate_idma_buffer(struct snd_pcm *pcm, int stream)
 371 {
 372         struct snd_pcm_substream *substream = pcm->streams[stream].substream;
 373         struct snd_dma_buffer *buf = &substream->dma_buffer;
 374
 375         buf->dev.dev = pcm->card->dev;
 376         buf->private_data = NULL;
 377
 378         /* Assign PCM buffer pointers */
 379         buf->dev.type = SNDRV_DMA_TYPE_CONTINUOUS;
 380         buf->addr = idma.lp_tx_addr;
 381         buf->bytes = idma_hardware.buffer_bytes_max;
 382         buf->area = (unsigned char *)ioremap(buf->addr, buf->bytes);
 383
 384         return 0;
 385 }
 386
 387 static u64 idma_mask = DMA_BIT_MASK(32);
 388
 389 static int idma_new(struct snd_soc_pcm_runtime *rtd)
 390 {
 391         struct snd_card *card = rtd->card->snd_card;
 392         struct snd_pcm *pcm = rtd->pcm;
 393         int ret = 0;
 394
 395         if (!card->dev->dma_mask)
 396                 card->dev->dma_mask = &idma_mask;
 397         if (!card->dev->coherent_dma_mask)
 398                 card->dev->coherent_dma_mask = DMA_BIT_MASK(32);
 399
 400         if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
 401                 ret = preallocate_idma_buffer(pcm,
 402                                 SNDRV_PCM_STREAM_PLAYBACK);
 403         }
 404
 405         return ret;
 406 }
 407
 408 void idma_reg_addr_init(void __iomem *regs, dma_addr_t addr)
 409 {
 410         spin_lock_init(&idma.lock);
 411         idma.regs = regs;
 412         idma.lp_tx_addr = addr;
 413 }
 414 EXPORT_SYMBOL_GPL(idma_reg_addr_init);
 415
 416 static struct snd_soc_platform_driver asoc_idma_platform = {
 417         .ops = &idma_ops,
 418         .pcm_new = idma_new,
 419         .pcm_free = idma_free,
 420 };
 421
 422 static int asoc_idma_platform_probe(struct platform_device *pdev)
 423 {
 424         idma_irq = platform_get_irq(pdev, 0);
 425         if (idma_irq < 0)
 426                 return idma_irq;
 427
 428         return snd_soc_register_platform(&pdev->dev, &asoc_idma_platform);
 429 }
 430
 431 static int asoc_idma_platform_remove(struct platform_device *pdev)
 432 {
 433         snd_soc_unregister_platform(&pdev->dev);
 434         return 0;
 435 }
 436
 437 static struct platform_driver asoc_idma_driver = {
 438         .driver = {
 439                 .name = "samsung-idma",
 440                 .owner = THIS_MODULE,
 441         },
 442
 443         .probe = asoc_idma_platform_probe,
 444         .remove = asoc_idma_platform_remove,
 445 };
 446
 447 module_platform_driver(asoc_idma_driver);
 448
 449 MODULE_AUTHOR("Jaswinder Singh, <jassisinghbrar@gmail.com>");
 450 MODULE_DESCRIPTION("Samsung ASoC IDMA Driver");
 451 MODULE_LICENSE("GPL");