sound/soc/samsung/idma.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 //
   3 // idma.c - I2S0 internal DMA driver
   4 //
   5 // Copyright (c) 2011 Samsung Electronics Co., Ltd.
   6 //              http://www.samsung.com
   7
   8 #include <linux/interrupt.h>
   9 #include <linux/platform_device.h>
  10 #include <linux/dma-mapping.h>
  11 #include <linux/slab.h>
  12 #include <linux/module.h>
  13 #include <sound/pcm.h>
  14 #include <sound/pcm_params.h>
  15 #include <sound/soc.h>
  16
  17 #include "i2s.h"
  18 #include "idma.h"
  19 #include "i2s-regs.h"
  20
  21 #define ST_RUNNING              (1<<0)
  22 #define ST_OPENED               (1<<1)
  23
  24 static const struct snd_pcm_hardware idma_hardware = {
  25         .info = SNDRV_PCM_INFO_INTERLEAVED |
  26                     SNDRV_PCM_INFO_BLOCK_TRANSFER |
  27                     SNDRV_PCM_INFO_MMAP |
  28                     SNDRV_PCM_INFO_MMAP_VALID |
  29                     SNDRV_PCM_INFO_PAUSE |
  30                     SNDRV_PCM_INFO_RESUME,
  31         .buffer_bytes_max = MAX_IDMA_BUFFER,
  32         .period_bytes_min = 128,
  33         .period_bytes_max = MAX_IDMA_PERIOD,
  34         .periods_min = 1,
  35         .periods_max = 2,
  36 };
  37
  38 struct idma_ctrl {
  39         spinlock_t      lock;
  40         int             state;
  41         dma_addr_t      start;
  42         dma_addr_t      pos;
  43         dma_addr_t      end;
  44         dma_addr_t      period;
  45         dma_addr_t      periodsz;
  46         void            *token;
  47         void            (*cb)(void *dt, int bytes_xfer);
  48 };
  49
  50 static struct idma_info {
  51         spinlock_t      lock;
  52         void             __iomem  *regs;
  53         dma_addr_t      lp_tx_addr;
  54 } idma;
  55
  56 static int idma_irq;
  57
  58 static void idma_getpos(dma_addr_t *src)
  59 {
  60         *src = idma.lp_tx_addr +
  61                 (readl(idma.regs + I2STRNCNT) & 0xffffff) * 4;
  62 }
  63
  64 static int idma_enqueue(struct snd_pcm_substream *substream)
  65 {
  66         struct snd_pcm_runtime *runtime = substream->runtime;
  67         struct idma_ctrl *prtd = substream->runtime->private_data;
  68         u32 val;
  69
  70         spin_lock(&prtd->lock);
  71         prtd->token = (void *) substream;
  72         spin_unlock(&prtd->lock);
  73
  74         /* Internal DMA Level0 Interrupt Address */
  75         val = idma.lp_tx_addr + prtd->periodsz;
  76         writel(val, idma.regs + I2SLVL0ADDR);
  77
  78         /* Start address0 of I2S internal DMA operation. */
  79         val = idma.lp_tx_addr;
  80         writel(val, idma.regs + I2SSTR0);
  81
  82         /*
  83          * Transfer block size for I2S internal DMA.
  84          * Should decide transfer size before start dma operation
  85          */
  86         val = readl(idma.regs + I2SSIZE);
  87         val &= ~(I2SSIZE_TRNMSK << I2SSIZE_SHIFT);
  88         val |= (((runtime->dma_bytes >> 2) &
  89                         I2SSIZE_TRNMSK) << I2SSIZE_SHIFT);
  90         writel(val, idma.regs + I2SSIZE);
  91
  92         val = readl(idma.regs + I2SAHB);
  93         val |= AHB_INTENLVL0;
  94         writel(val, idma.regs + I2SAHB);
  95
  96         return 0;
  97 }
  98
  99 static void idma_setcallbk(struct snd_pcm_substream *substream,
 100                                 void (*cb)(void *, int))
 101 {
 102         struct idma_ctrl *prtd = substream->runtime->private_data;
 103
 104         spin_lock(&prtd->lock);
 105         prtd->cb = cb;
 106         spin_unlock(&prtd->lock);
 107 }
 108
 109 static void idma_control(int op)
 110 {
 111         u32 val = readl(idma.regs + I2SAHB);
 112
 113         spin_lock(&idma.lock);
 114
 115         switch (op) {
 116         case LPAM_DMA_START:
 117                 val |= (AHB_INTENLVL0 | AHB_DMAEN);
 118                 break;
 119         case LPAM_DMA_STOP:
 120                 val &= ~(AHB_INTENLVL0 | AHB_DMAEN);
 121                 break;
 122         default:
 123                 spin_unlock(&idma.lock);
 124                 return;
 125         }
 126
 127         writel(val, idma.regs + I2SAHB);
 128         spin_unlock(&idma.lock);
 129 }
 130
 131 static void idma_done(void *id, int bytes_xfer)
 132 {
 133         struct snd_pcm_substream *substream = id;
 134         struct idma_ctrl *prtd = substream->runtime->private_data;
 135
 136         if (prtd && (prtd->state & ST_RUNNING))
 137                 snd_pcm_period_elapsed(substream);
 138 }
 139
 140 static int idma_hw_params(struct snd_soc_component *component,
 141                           struct snd_pcm_substream *substream,
 142                           struct snd_pcm_hw_params *params)
 143 {
 144         struct snd_pcm_runtime *runtime = substream->runtime;
 145         struct idma_ctrl *prtd = substream->runtime->private_data;
 146         u32 mod = readl(idma.regs + I2SMOD);
 147         u32 ahb = readl(idma.regs + I2SAHB);
 148
 149         ahb |= (AHB_DMARLD | AHB_INTMASK);
 150         mod |= MOD_TXS_IDMA;
 151         writel(ahb, idma.regs + I2SAHB);
 152         writel(mod, idma.regs + I2SMOD);
 153
 154         snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
 155         runtime->dma_bytes = params_buffer_bytes(params);
 156
 157         prtd->start = prtd->pos = runtime->dma_addr;
 158         prtd->period = params_periods(params);
 159         prtd->periodsz = params_period_bytes(params);
 160         prtd->end = runtime->dma_addr + runtime->dma_bytes;
 161
 162         idma_setcallbk(substream, idma_done);
 163
 164         return 0;
 165 }
 166
 167 static int idma_hw_free(struct snd_soc_component *component,
 168                         struct snd_pcm_substream *substream)
 169 {
 170         snd_pcm_set_runtime_buffer(substream, NULL);
 171
 172         return 0;
 173 }
 174
 175 static int idma_prepare(struct snd_soc_component *component,
 176                         struct snd_pcm_substream *substream)
 177 {
 178         struct idma_ctrl *prtd = substream->runtime->private_data;
 179
 180         prtd->pos = prtd->start;
 181
 182         /* flush the DMA channel */
 183         idma_control(LPAM_DMA_STOP);
 184         idma_enqueue(substream);
 185
 186         return 0;
 187 }
 188
 189 static int idma_trigger(struct snd_soc_component *component,
 190                         struct snd_pcm_substream *substream, int cmd)
 191 {
 192         struct idma_ctrl *prtd = substream->runtime->private_data;
 193         int ret = 0;
 194
 195         spin_lock(&prtd->lock);
 196
 197         switch (cmd) {
 198         case SNDRV_PCM_TRIGGER_RESUME:
 199         case SNDRV_PCM_TRIGGER_START:
 200         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 201                 prtd->state |= ST_RUNNING;
 202                 idma_control(LPAM_DMA_START);
 203                 break;
 204
 205         case SNDRV_PCM_TRIGGER_SUSPEND:
 206         case SNDRV_PCM_TRIGGER_STOP:
 207         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 208                 prtd->state &= ~ST_RUNNING;
 209                 idma_control(LPAM_DMA_STOP);
 210                 break;
 211
 212         default:
 213                 ret = -EINVAL;
 214                 break;
 215         }
 216
 217         spin_unlock(&prtd->lock);
 218
 219         return ret;
 220 }
 221
 222 static snd_pcm_uframes_t
 223 idma_pointer(struct snd_soc_component *component,
 224              struct snd_pcm_substream *substream)
 225 {
 226         struct snd_pcm_runtime *runtime = substream->runtime;
 227         struct idma_ctrl *prtd = runtime->private_data;
 228         dma_addr_t src;
 229         unsigned long res;
 230
 231         spin_lock(&prtd->lock);
 232
 233         idma_getpos(&src);
 234         res = src - prtd->start;
 235
 236         spin_unlock(&prtd->lock);
 237
 238         return bytes_to_frames(substream->runtime, res);
 239 }
 240
 241 static int idma_mmap(struct snd_soc_component *component,
 242                      struct snd_pcm_substream *substream,
 243         struct vm_area_struct *vma)
 244 {
 245         struct snd_pcm_runtime *runtime = substream->runtime;
 246         unsigned long size, offset;
 247         int ret;
 248
 249         /* From snd_pcm_lib_mmap_iomem */
 250         vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
 251         size = vma->vm_end - vma->vm_start;
 252         offset = vma->vm_pgoff << PAGE_SHIFT;
 253         ret = io_remap_pfn_range(vma, vma->vm_start,
 254                         (runtime->dma_addr + offset) >> PAGE_SHIFT,
 255                         size, vma->vm_page_prot);
 256
 257         return ret;
 258 }
 259
 260 static irqreturn_t iis_irq(int irqno, void *dev_id)
 261 {
 262         struct idma_ctrl *prtd = (struct idma_ctrl *)dev_id;
 263         u32 iisahb, val, addr;
 264
 265         iisahb  = readl(idma.regs + I2SAHB);
 266
 267         val = (iisahb & AHB_LVL0INT) ? AHB_CLRLVL0INT : 0;
 268
 269         if (val) {
 270                 iisahb |= val;
 271                 writel(iisahb, idma.regs + I2SAHB);
 272
 273                 addr = readl(idma.regs + I2SLVL0ADDR) - idma.lp_tx_addr;
 274                 addr += prtd->periodsz;
 275                 addr %= (u32)(prtd->end - prtd->start);
 276                 addr += idma.lp_tx_addr;
 277
 278                 writel(addr, idma.regs + I2SLVL0ADDR);
 279
 280                 if (prtd->cb)
 281                         prtd->cb(prtd->token, prtd->period);
 282         }
 283
 284         return IRQ_HANDLED;
 285 }
 286
 287 static int idma_open(struct snd_soc_component *component,
 288                      struct snd_pcm_substream *substream)
 289 {
 290         struct snd_pcm_runtime *runtime = substream->runtime;
 291         struct idma_ctrl *prtd;
 292         int ret;
 293
 294         snd_soc_set_runtime_hwparams(substream, &idma_hardware);
 295
 296         prtd = kzalloc(sizeof(struct idma_ctrl), GFP_KERNEL);
 297         if (prtd == NULL)
 298                 return -ENOMEM;
 299
 300         ret = request_irq(idma_irq, iis_irq, 0, "i2s", prtd);
 301         if (ret < 0) {
 302                 pr_err("fail to claim i2s irq , ret = %d\n", ret);
 303                 kfree(prtd);
 304                 return ret;
 305         }
 306
 307         spin_lock_init(&prtd->lock);
 308
 309         runtime->private_data = prtd;
 310
 311         return 0;
 312 }
 313
 314 static int idma_close(struct snd_soc_component *component,
 315                       struct snd_pcm_substream *substream)
 316 {
 317         struct snd_pcm_runtime *runtime = substream->runtime;
 318         struct idma_ctrl *prtd = runtime->private_data;
 319
 320         free_irq(idma_irq, prtd);
 321
 322         if (!prtd)
 323                 pr_err("idma_close called with prtd == NULL\n");
 324
 325         kfree(prtd);
 326
 327         return 0;
 328 }
 329
 330 static void idma_free(struct snd_soc_component *component,
 331                       struct snd_pcm *pcm)
 332 {
 333         struct snd_pcm_substream *substream;
 334         struct snd_dma_buffer *buf;
 335
 336         substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream;
 337         if (!substream)
 338                 return;
 339
 340         buf = &substream->dma_buffer;
 341         if (!buf->area)
 342                 return;
 343
 344         iounmap((void __iomem *)buf->area);
 345
 346         buf->area = NULL;
 347         buf->addr = 0;
 348 }
 349
 350 static int preallocate_idma_buffer(struct snd_pcm *pcm, int stream)
 351 {
 352         struct snd_pcm_substream *substream = pcm->streams[stream].substream;
 353         struct snd_dma_buffer *buf = &substream->dma_buffer;
 354
 355         buf->dev.dev = pcm->card->dev;
 356         buf->private_data = NULL;
 357
 358         /* Assign PCM buffer pointers */
 359         buf->dev.type = SNDRV_DMA_TYPE_CONTINUOUS;
 360         buf->addr = idma.lp_tx_addr;
 361         buf->bytes = idma_hardware.buffer_bytes_max;
 362         buf->area = (unsigned char * __force)ioremap(buf->addr, buf->bytes);
 363
 364         return 0;
 365 }
 366
 367 static int idma_new(struct snd_soc_component *component,
 368                     struct snd_soc_pcm_runtime *rtd)
 369 {
 370         struct snd_card *card = rtd->card->snd_card;
 371         struct snd_pcm *pcm = rtd->pcm;
 372         int ret;
 373
 374         ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
 375         if (ret)
 376                 return ret;
 377
 378         if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
 379                 ret = preallocate_idma_buffer(pcm,
 380                                 SNDRV_PCM_STREAM_PLAYBACK);
 381         }
 382
 383         return ret;
 384 }
 385
 386 void idma_reg_addr_init(void __iomem *regs, dma_addr_t addr)
 387 {
 388         spin_lock_init(&idma.lock);
 389         idma.regs = regs;
 390         idma.lp_tx_addr = addr;
 391 }
 392 EXPORT_SYMBOL_GPL(idma_reg_addr_init);
 393
 394 static const struct snd_soc_component_driver asoc_idma_platform = {
 395         .open           = idma_open,
 396         .close          = idma_close,
 397         .trigger        = idma_trigger,
 398         .pointer        = idma_pointer,
 399         .mmap           = idma_mmap,
 400         .hw_params      = idma_hw_params,
 401         .hw_free        = idma_hw_free,
 402         .prepare        = idma_prepare,
 403         .pcm_construct  = idma_new,
 404         .pcm_destruct   = idma_free,
 405 };
 406
 407 static int asoc_idma_platform_probe(struct platform_device *pdev)
 408 {
 409         idma_irq = platform_get_irq(pdev, 0);
 410         if (idma_irq < 0)
 411                 return idma_irq;
 412
 413         return devm_snd_soc_register_component(&pdev->dev, &asoc_idma_platform,
 414                                                NULL, 0);
 415 }
 416
 417 static struct platform_driver asoc_idma_driver = {
 418         .driver = {
 419                 .name = "samsung-idma",
 420         },
 421
 422         .probe = asoc_idma_platform_probe,
 423 };
 424
 425 module_platform_driver(asoc_idma_driver);
 426
 427 MODULE_AUTHOR("Jaswinder Singh, <jassisinghbrar@gmail.com>");
 428 MODULE_DESCRIPTION("Samsung ASoC IDMA Driver");
 429 MODULE_LICENSE("GPL");