sound/soc/sh/rcar/dma.c

   1 /*
   2  * Renesas R-Car Audio DMAC support
   3  *
   4  * Copyright (C) 2015 Renesas Electronics Corp.
   5  * Copyright (c) 2015 Kuninori Morimoto <kuninori.morimoto.gx@renesas.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 #include <linux/delay.h>
  12 #include <linux/of_dma.h>
  13 #include "rsnd.h"
  14
  15 /*
  16  * Audio DMAC peri peri register
  17  */
  18 #define PDMASAR         0x00
  19 #define PDMADAR         0x04
  20 #define PDMACHCR        0x0c
  21
  22 /* PDMACHCR */
  23 #define PDMACHCR_DE             (1 << 0)
  24
  25
  26 struct rsnd_dmaen {
  27         struct dma_chan         *chan;
  28         dma_addr_t              dma_buf;
  29         unsigned int            dma_len;
  30         unsigned int            dma_period;
  31         unsigned int            dma_cnt;
  32 };
  33
  34 struct rsnd_dmapp {
  35         int                     dmapp_id;
  36         u32                     chcr;
  37 };
  38
  39 struct rsnd_dma {
  40         struct rsnd_mod         mod;
  41         struct rsnd_mod         *mod_from;
  42         struct rsnd_mod         *mod_to;
  43         dma_addr_t              src_addr;
  44         dma_addr_t              dst_addr;
  45         union {
  46                 struct rsnd_dmaen en;
  47                 struct rsnd_dmapp pp;
  48         } dma;
  49 };
  50
  51 struct rsnd_dma_ctrl {
  52         void __iomem *base;
  53         int dmaen_num;
  54         int dmapp_num;
  55 };
  56
  57 #define rsnd_priv_to_dmac(p)    ((struct rsnd_dma_ctrl *)(p)->dma)
  58 #define rsnd_mod_to_dma(_mod) container_of((_mod), struct rsnd_dma, mod)
  59 #define rsnd_dma_to_dmaen(dma)  (&(dma)->dma.en)
  60 #define rsnd_dma_to_dmapp(dma)  (&(dma)->dma.pp)
  61
  62 /*
  63  *              Audio DMAC
  64  */
  65 #define rsnd_dmaen_sync(dmaen, io, i)   __rsnd_dmaen_sync(dmaen, io, i, 1)
  66 #define rsnd_dmaen_unsync(dmaen, io, i) __rsnd_dmaen_sync(dmaen, io, i, 0)
  67 static void __rsnd_dmaen_sync(struct rsnd_dmaen *dmaen, struct rsnd_dai_stream *io,
  68                               int i, int sync)
  69 {
  70         struct device *dev = dmaen->chan->device->dev;
  71         enum dma_data_direction dir;
  72         int is_play = rsnd_io_is_play(io);
  73         dma_addr_t buf;
  74         int len, max;
  75         size_t period;
  76
  77         len     = dmaen->dma_len;
  78         period  = dmaen->dma_period;
  79         max     = len / period;
  80         i       = i % max;
  81         buf     = dmaen->dma_buf + (period * i);
  82
  83         dir = is_play ? DMA_TO_DEVICE : DMA_FROM_DEVICE;
  84
  85         if (sync)
  86                 dma_sync_single_for_device(dev, buf, period, dir);
  87         else
  88                 dma_sync_single_for_cpu(dev, buf, period, dir);
  89 }
  90
  91 static void __rsnd_dmaen_complete(struct rsnd_mod *mod,
  92                                   struct rsnd_dai_stream *io)
  93 {
  94         struct rsnd_priv *priv = rsnd_mod_to_priv(mod);
  95         struct rsnd_dma *dma = rsnd_mod_to_dma(mod);
  96         struct rsnd_dmaen *dmaen = rsnd_dma_to_dmaen(dma);
  97         bool elapsed = false;
  98         unsigned long flags;
  99
 100         /*
 101          * Renesas sound Gen1 needs 1 DMAC,
 102          * Gen2 needs 2 DMAC.
 103          * In Gen2 case, it are Audio-DMAC, and Audio-DMAC-peri-peri.
 104          * But, Audio-DMAC-peri-peri doesn't have interrupt,
 105          * and this driver is assuming that here.
 106          *
 107          * If Audio-DMAC-peri-peri has interrpt,
 108          * rsnd_dai_pointer_update() will be called twice,
 109          * ant it will breaks io->byte_pos
 110          */
 111         spin_lock_irqsave(&priv->lock, flags);
 112
 113         if (rsnd_io_is_working(io)) {
 114                 rsnd_dmaen_unsync(dmaen, io, dmaen->dma_cnt);
 115
 116                 /*
 117                  * Next period is already started.
 118                  * Let's sync Next Next period
 119                  * see
 120                  *      rsnd_dmaen_start()
 121                  */
 122                 rsnd_dmaen_sync(dmaen, io, dmaen->dma_cnt + 2);
 123
 124                 elapsed = rsnd_dai_pointer_update(io, io->byte_per_period);
 125
 126                 dmaen->dma_cnt++;
 127         }
 128
 129         spin_unlock_irqrestore(&priv->lock, flags);
 130
 131         if (elapsed)
 132                 rsnd_dai_period_elapsed(io);
 133 }
 134
 135 static void rsnd_dmaen_complete(void *data)
 136 {
 137         struct rsnd_mod *mod = data;
 138
 139         rsnd_mod_interrupt(mod, __rsnd_dmaen_complete);
 140 }
 141
 142 static struct dma_chan *rsnd_dmaen_request_channel(struct rsnd_dai_stream *io,
 143                                                    struct rsnd_mod *mod_from,
 144                                                    struct rsnd_mod *mod_to)
 145 {
 146         if ((!mod_from && !mod_to) ||
 147             (mod_from && mod_to))
 148                 return NULL;
 149
 150         if (mod_from)
 151                 return rsnd_mod_dma_req(io, mod_from);
 152         else
 153                 return rsnd_mod_dma_req(io, mod_to);
 154 }
 155
 156 static int rsnd_dmaen_stop(struct rsnd_mod *mod,
 157                            struct rsnd_dai_stream *io,
 158                            struct rsnd_priv *priv)
 159 {
 160         struct rsnd_dma *dma = rsnd_mod_to_dma(mod);
 161         struct rsnd_dmaen *dmaen = rsnd_dma_to_dmaen(dma);
 162
 163         if (dmaen->chan) {
 164                 int is_play = rsnd_io_is_play(io);
 165
 166                 dmaengine_terminate_all(dmaen->chan);
 167                 dma_unmap_single(dmaen->chan->device->dev,
 168                                  dmaen->dma_buf, dmaen->dma_len,
 169                                  is_play ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
 170         }
 171
 172         return 0;
 173 }
 174
 175 static int rsnd_dmaen_nolock_stop(struct rsnd_mod *mod,
 176                                    struct rsnd_dai_stream *io,
 177                                    struct rsnd_priv *priv)
 178 {
 179         struct rsnd_dma *dma = rsnd_mod_to_dma(mod);
 180         struct rsnd_dmaen *dmaen = rsnd_dma_to_dmaen(dma);
 181
 182         /*
 183          * DMAEngine release uses mutex lock.
 184          * Thus, it shouldn't be called under spinlock.
 185          * Let's call it under nolock_start
 186          */
 187         if (dmaen->chan)
 188                 dma_release_channel(dmaen->chan);
 189
 190         dmaen->chan = NULL;
 191
 192         return 0;
 193 }
 194
 195 static int rsnd_dmaen_nolock_start(struct rsnd_mod *mod,
 196                             struct rsnd_dai_stream *io,
 197                             struct rsnd_priv *priv)
 198 {
 199         struct rsnd_dma *dma = rsnd_mod_to_dma(mod);
 200         struct rsnd_dmaen *dmaen = rsnd_dma_to_dmaen(dma);
 201         struct device *dev = rsnd_priv_to_dev(priv);
 202
 203         if (dmaen->chan) {
 204                 dev_err(dev, "it already has dma channel\n");
 205                 return -EIO;
 206         }
 207
 208         /*
 209          * DMAEngine request uses mutex lock.
 210          * Thus, it shouldn't be called under spinlock.
 211          * Let's call it under nolock_start
 212          */
 213         dmaen->chan = rsnd_dmaen_request_channel(io,
 214                                                  dma->mod_from,
 215                                                  dma->mod_to);
 216         if (IS_ERR_OR_NULL(dmaen->chan)) {
 217                 int ret = PTR_ERR(dmaen->chan);
 218
 219                 dmaen->chan = NULL;
 220                 dev_err(dev, "can't get dma channel\n");
 221                 return ret;
 222         }
 223
 224         return 0;
 225 }
 226
 227 static int rsnd_dmaen_start(struct rsnd_mod *mod,
 228                             struct rsnd_dai_stream *io,
 229                             struct rsnd_priv *priv)
 230 {
 231         struct rsnd_dma *dma = rsnd_mod_to_dma(mod);
 232         struct rsnd_dmaen *dmaen = rsnd_dma_to_dmaen(dma);
 233         struct snd_pcm_substream *substream = io->substream;
 234         struct device *dev = rsnd_priv_to_dev(priv);
 235         struct dma_async_tx_descriptor *desc;
 236         struct dma_slave_config cfg = {};
 237         dma_addr_t buf;
 238         size_t len;
 239         size_t period;
 240         int is_play = rsnd_io_is_play(io);
 241         int i;
 242         int ret;
 243
 244         cfg.direction   = is_play ? DMA_MEM_TO_DEV : DMA_DEV_TO_MEM;
 245         cfg.src_addr    = dma->src_addr;
 246         cfg.dst_addr    = dma->dst_addr;
 247         cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
 248         cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
 249
 250         dev_dbg(dev, "%s[%d] %pad -> %pad\n",
 251                 rsnd_mod_name(mod), rsnd_mod_id(mod),
 252                 &cfg.src_addr, &cfg.dst_addr);
 253
 254         ret = dmaengine_slave_config(dmaen->chan, &cfg);
 255         if (ret < 0)
 256                 return ret;
 257
 258         len     = snd_pcm_lib_buffer_bytes(substream);
 259         period  = snd_pcm_lib_period_bytes(substream);
 260         buf     = dma_map_single(dmaen->chan->device->dev,
 261                                  substream->runtime->dma_area,
 262                                  len,
 263                                  is_play ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
 264         if (dma_mapping_error(dmaen->chan->device->dev, buf)) {
 265                 dev_err(dev, "dma map failed\n");
 266                 return -EIO;
 267         }
 268
 269         desc = dmaengine_prep_dma_cyclic(dmaen->chan,
 270                                          buf, len, period,
 271                                          is_play ? DMA_MEM_TO_DEV : DMA_DEV_TO_MEM,
 272                                          DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
 273
 274         if (!desc) {
 275                 dev_err(dev, "dmaengine_prep_slave_sg() fail\n");
 276                 return -EIO;
 277         }
 278
 279         desc->callback          = rsnd_dmaen_complete;
 280         desc->callback_param    = rsnd_mod_get(dma);
 281
 282         dmaen->dma_buf          = buf;
 283         dmaen->dma_len          = len;
 284         dmaen->dma_period       = period;
 285         dmaen->dma_cnt          = 0;
 286
 287         /*
 288          * synchronize this and next period
 289          * see
 290          *      __rsnd_dmaen_complete()
 291          */
 292         for (i = 0; i < 2; i++)
 293                 rsnd_dmaen_sync(dmaen, io, i);
 294
 295         if (dmaengine_submit(desc) < 0) {
 296                 dev_err(dev, "dmaengine_submit() fail\n");
 297                 return -EIO;
 298         }
 299
 300         dma_async_issue_pending(dmaen->chan);
 301
 302         return 0;
 303 }
 304
 305 struct dma_chan *rsnd_dma_request_channel(struct device_node *of_node,
 306                                           struct rsnd_mod *mod, char *name)
 307 {
 308         struct dma_chan *chan = NULL;
 309         struct device_node *np;
 310         int i = 0;
 311
 312         for_each_child_of_node(of_node, np) {
 313                 if (i == rsnd_mod_id(mod) && (!chan))
 314                         chan = of_dma_request_slave_channel(np, name);
 315                 i++;
 316         }
 317
 318         /* It should call of_node_put(), since, it is rsnd_xxx_of_node() */
 319         of_node_put(of_node);
 320
 321         return chan;
 322 }
 323
 324 static int rsnd_dmaen_attach(struct rsnd_dai_stream *io,
 325                            struct rsnd_dma *dma,
 326                            struct rsnd_mod *mod_from, struct rsnd_mod *mod_to)
 327 {
 328         struct rsnd_priv *priv = rsnd_io_to_priv(io);
 329         struct rsnd_dma_ctrl *dmac = rsnd_priv_to_dmac(priv);
 330         struct dma_chan *chan;
 331
 332         /* try to get DMAEngine channel */
 333         chan = rsnd_dmaen_request_channel(io, mod_from, mod_to);
 334         if (IS_ERR_OR_NULL(chan)) {
 335                 /*
 336                  * DMA failed. try to PIO mode
 337                  * see
 338                  *      rsnd_ssi_fallback()
 339                  *      rsnd_rdai_continuance_probe()
 340                  */
 341                 return -EAGAIN;
 342         }
 343
 344         dma_release_channel(chan);
 345
 346         dmac->dmaen_num++;
 347
 348         return 0;
 349 }
 350
 351 static struct rsnd_mod_ops rsnd_dmaen_ops = {
 352         .name   = "audmac",
 353         .nolock_start = rsnd_dmaen_nolock_start,
 354         .nolock_stop  = rsnd_dmaen_nolock_stop,
 355         .start  = rsnd_dmaen_start,
 356         .stop   = rsnd_dmaen_stop,
 357 };
 358
 359 /*
 360  *              Audio DMAC peri peri
 361  */
 362 static const u8 gen2_id_table_ssiu[] = {
 363         0x00, /* SSI00 */
 364         0x04, /* SSI10 */
 365         0x08, /* SSI20 */
 366         0x0c, /* SSI3  */
 367         0x0d, /* SSI4  */
 368         0x0e, /* SSI5  */
 369         0x0f, /* SSI6  */
 370         0x10, /* SSI7  */
 371         0x11, /* SSI8  */
 372         0x12, /* SSI90 */
 373 };
 374 static const u8 gen2_id_table_scu[] = {
 375         0x2d, /* SCU_SRCI0 */
 376         0x2e, /* SCU_SRCI1 */
 377         0x2f, /* SCU_SRCI2 */
 378         0x30, /* SCU_SRCI3 */
 379         0x31, /* SCU_SRCI4 */
 380         0x32, /* SCU_SRCI5 */
 381         0x33, /* SCU_SRCI6 */
 382         0x34, /* SCU_SRCI7 */
 383         0x35, /* SCU_SRCI8 */
 384         0x36, /* SCU_SRCI9 */
 385 };
 386 static const u8 gen2_id_table_cmd[] = {
 387         0x37, /* SCU_CMD0 */
 388         0x38, /* SCU_CMD1 */
 389 };
 390
 391 static u32 rsnd_dmapp_get_id(struct rsnd_dai_stream *io,
 392                              struct rsnd_mod *mod)
 393 {
 394         struct rsnd_mod *ssi = rsnd_io_to_mod_ssi(io);
 395         struct rsnd_mod *src = rsnd_io_to_mod_src(io);
 396         struct rsnd_mod *dvc = rsnd_io_to_mod_dvc(io);
 397         const u8 *entry = NULL;
 398         int id = rsnd_mod_id(mod);
 399         int size = 0;
 400
 401         if (mod == ssi) {
 402                 entry = gen2_id_table_ssiu;
 403                 size = ARRAY_SIZE(gen2_id_table_ssiu);
 404         } else if (mod == src) {
 405                 entry = gen2_id_table_scu;
 406                 size = ARRAY_SIZE(gen2_id_table_scu);
 407         } else if (mod == dvc) {
 408                 entry = gen2_id_table_cmd;
 409                 size = ARRAY_SIZE(gen2_id_table_cmd);
 410         }
 411
 412         if ((!entry) || (size <= id)) {
 413                 struct device *dev = rsnd_priv_to_dev(rsnd_io_to_priv(io));
 414
 415                 dev_err(dev, "unknown connection (%s[%d])\n",
 416                         rsnd_mod_name(mod), rsnd_mod_id(mod));
 417
 418                 /* use non-prohibited SRS number as error */
 419                 return 0x00; /* SSI00 */
 420         }
 421
 422         return entry[id];
 423 }
 424
 425 static u32 rsnd_dmapp_get_chcr(struct rsnd_dai_stream *io,
 426                                struct rsnd_mod *mod_from,
 427                                struct rsnd_mod *mod_to)
 428 {
 429         return  (rsnd_dmapp_get_id(io, mod_from) << 24) +
 430                 (rsnd_dmapp_get_id(io, mod_to) << 16);
 431 }
 432
 433 #define rsnd_dmapp_addr(dmac, dma, reg) \
 434         (dmac->base + 0x20 + reg + \
 435          (0x10 * rsnd_dma_to_dmapp(dma)->dmapp_id))
 436 static void rsnd_dmapp_write(struct rsnd_dma *dma, u32 data, u32 reg)
 437 {
 438         struct rsnd_mod *mod = rsnd_mod_get(dma);
 439         struct rsnd_priv *priv = rsnd_mod_to_priv(mod);
 440         struct rsnd_dma_ctrl *dmac = rsnd_priv_to_dmac(priv);
 441         struct device *dev = rsnd_priv_to_dev(priv);
 442
 443         dev_dbg(dev, "w %p : %08x\n", rsnd_dmapp_addr(dmac, dma, reg), data);
 444
 445         iowrite32(data, rsnd_dmapp_addr(dmac, dma, reg));
 446 }
 447
 448 static u32 rsnd_dmapp_read(struct rsnd_dma *dma, u32 reg)
 449 {
 450         struct rsnd_mod *mod = rsnd_mod_get(dma);
 451         struct rsnd_priv *priv = rsnd_mod_to_priv(mod);
 452         struct rsnd_dma_ctrl *dmac = rsnd_priv_to_dmac(priv);
 453
 454         return ioread32(rsnd_dmapp_addr(dmac, dma, reg));
 455 }
 456
 457 static void rsnd_dmapp_bset(struct rsnd_dma *dma, u32 data, u32 mask, u32 reg)
 458 {
 459         struct rsnd_mod *mod = rsnd_mod_get(dma);
 460         struct rsnd_priv *priv = rsnd_mod_to_priv(mod);
 461         struct rsnd_dma_ctrl *dmac = rsnd_priv_to_dmac(priv);
 462         void __iomem *addr = rsnd_dmapp_addr(dmac, dma, reg);
 463         u32 val = ioread32(addr);
 464
 465         val &= ~mask;
 466         val |= (data & mask);
 467
 468         iowrite32(val, addr);
 469 }
 470
 471 static int rsnd_dmapp_stop(struct rsnd_mod *mod,
 472                            struct rsnd_dai_stream *io,
 473                            struct rsnd_priv *priv)
 474 {
 475         struct rsnd_dma *dma = rsnd_mod_to_dma(mod);
 476         int i;
 477
 478         rsnd_dmapp_bset(dma, 0,  PDMACHCR_DE, PDMACHCR);
 479
 480         for (i = 0; i < 1024; i++) {
 481                 if (0 == (rsnd_dmapp_read(dma, PDMACHCR) & PDMACHCR_DE))
 482                         return 0;
 483                 udelay(1);
 484         }
 485
 486         return -EIO;
 487 }
 488
 489 static int rsnd_dmapp_start(struct rsnd_mod *mod,
 490                             struct rsnd_dai_stream *io,
 491                             struct rsnd_priv *priv)
 492 {
 493         struct rsnd_dma *dma = rsnd_mod_to_dma(mod);
 494         struct rsnd_dmapp *dmapp = rsnd_dma_to_dmapp(dma);
 495
 496         rsnd_dmapp_write(dma, dma->src_addr,    PDMASAR);
 497         rsnd_dmapp_write(dma, dma->dst_addr,    PDMADAR);
 498         rsnd_dmapp_write(dma, dmapp->chcr,      PDMACHCR);
 499
 500         return 0;
 501 }
 502
 503 static int rsnd_dmapp_attach(struct rsnd_dai_stream *io,
 504                              struct rsnd_dma *dma,
 505                              struct rsnd_mod *mod_from, struct rsnd_mod *mod_to)
 506 {
 507         struct rsnd_dmapp *dmapp = rsnd_dma_to_dmapp(dma);
 508         struct rsnd_priv *priv = rsnd_io_to_priv(io);
 509         struct rsnd_dma_ctrl *dmac = rsnd_priv_to_dmac(priv);
 510         struct device *dev = rsnd_priv_to_dev(priv);
 511
 512         dmapp->dmapp_id = dmac->dmapp_num;
 513         dmapp->chcr = rsnd_dmapp_get_chcr(io, mod_from, mod_to) | PDMACHCR_DE;
 514
 515         dmac->dmapp_num++;
 516
 517         dev_dbg(dev, "id/src/dst/chcr = %d/%pad/%pad/%08x\n",
 518                 dmapp->dmapp_id, &dma->src_addr, &dma->dst_addr, dmapp->chcr);
 519
 520         return 0;
 521 }
 522
 523 static struct rsnd_mod_ops rsnd_dmapp_ops = {
 524         .name   = "audmac-pp",
 525         .start  = rsnd_dmapp_start,
 526         .stop   = rsnd_dmapp_stop,
 527         .quit   = rsnd_dmapp_stop,
 528 };
 529
 530 /*
 531  *              Common DMAC Interface
 532  */
 533
 534 /*
 535  *      DMA read/write register offset
 536  *
 537  *      RSND_xxx_I_N    for Audio DMAC input
 538  *      RSND_xxx_O_N    for Audio DMAC output
 539  *      RSND_xxx_I_P    for Audio DMAC peri peri input
 540  *      RSND_xxx_O_P    for Audio DMAC peri peri output
 541  *
 542  *      ex) R-Car H2 case
 543  *            mod        / DMAC in    / DMAC out   / DMAC PP in / DMAC pp out
 544  *      SSI : 0xec541000 / 0xec241008 / 0xec24100c
 545  *      SSIU: 0xec541000 / 0xec100000 / 0xec100000 / 0xec400000 / 0xec400000
 546  *      SCU : 0xec500000 / 0xec000000 / 0xec004000 / 0xec300000 / 0xec304000
 547  *      CMD : 0xec500000 /            / 0xec008000                0xec308000
 548  */
 549 #define RDMA_SSI_I_N(addr, i)   (addr ##_reg - 0x00300000 + (0x40 * i) + 0x8)
 550 #define RDMA_SSI_O_N(addr, i)   (addr ##_reg - 0x00300000 + (0x40 * i) + 0xc)
 551
 552 #define RDMA_SSIU_I_N(addr, i)  (addr ##_reg - 0x00441000 + (0x1000 * i))
 553 #define RDMA_SSIU_O_N(addr, i)  (addr ##_reg - 0x00441000 + (0x1000 * i))
 554
 555 #define RDMA_SSIU_I_P(addr, i)  (addr ##_reg - 0x00141000 + (0x1000 * i))
 556 #define RDMA_SSIU_O_P(addr, i)  (addr ##_reg - 0x00141000 + (0x1000 * i))
 557
 558 #define RDMA_SRC_I_N(addr, i)   (addr ##_reg - 0x00500000 + (0x400 * i))
 559 #define RDMA_SRC_O_N(addr, i)   (addr ##_reg - 0x004fc000 + (0x400 * i))
 560
 561 #define RDMA_SRC_I_P(addr, i)   (addr ##_reg - 0x00200000 + (0x400 * i))
 562 #define RDMA_SRC_O_P(addr, i)   (addr ##_reg - 0x001fc000 + (0x400 * i))
 563
 564 #define RDMA_CMD_O_N(addr, i)   (addr ##_reg - 0x004f8000 + (0x400 * i))
 565 #define RDMA_CMD_O_P(addr, i)   (addr ##_reg - 0x001f8000 + (0x400 * i))
 566
 567 static dma_addr_t
 568 rsnd_gen2_dma_addr(struct rsnd_dai_stream *io,
 569                    struct rsnd_mod *mod,
 570                    int is_play, int is_from)
 571 {
 572         struct rsnd_priv *priv = rsnd_io_to_priv(io);
 573         struct device *dev = rsnd_priv_to_dev(priv);
 574         phys_addr_t ssi_reg = rsnd_gen_get_phy_addr(priv, RSND_GEN2_SSI);
 575         phys_addr_t src_reg = rsnd_gen_get_phy_addr(priv, RSND_GEN2_SCU);
 576         int is_ssi = !!(rsnd_io_to_mod_ssi(io) == mod);
 577         int use_src = !!rsnd_io_to_mod_src(io);
 578         int use_cmd = !!rsnd_io_to_mod_dvc(io) ||
 579                       !!rsnd_io_to_mod_mix(io) ||
 580                       !!rsnd_io_to_mod_ctu(io);
 581         int id = rsnd_mod_id(mod);
 582         struct dma_addr {
 583                 dma_addr_t out_addr;
 584                 dma_addr_t in_addr;
 585         } dma_addrs[3][2][3] = {
 586                 /* SRC */
 587                 {{{ 0,                          0 },
 588                   /* Capture */
 589                   { RDMA_SRC_O_N(src, id),      RDMA_SRC_I_P(src, id) },
 590                   { RDMA_CMD_O_N(src, id),      RDMA_SRC_I_P(src, id) } },
 591                  /* Playback */
 592                  {{ 0,                          0, },
 593                   { RDMA_SRC_O_P(src, id),      RDMA_SRC_I_N(src, id) },
 594                   { RDMA_CMD_O_P(src, id),      RDMA_SRC_I_N(src, id) } }
 595                 },
 596                 /* SSI */
 597                 /* Capture */
 598                 {{{ RDMA_SSI_O_N(ssi, id),      0 },
 599                   { RDMA_SSIU_O_P(ssi, id),     0 },
 600                   { RDMA_SSIU_O_P(ssi, id),     0 } },
 601                  /* Playback */
 602                  {{ 0,                          RDMA_SSI_I_N(ssi, id) },
 603                   { 0,                          RDMA_SSIU_I_P(ssi, id) },
 604                   { 0,                          RDMA_SSIU_I_P(ssi, id) } }
 605                 },
 606                 /* SSIU */
 607                 /* Capture */
 608                 {{{ RDMA_SSIU_O_N(ssi, id),     0 },
 609                   { RDMA_SSIU_O_P(ssi, id),     0 },
 610                   { RDMA_SSIU_O_P(ssi, id),     0 } },
 611                  /* Playback */
 612                  {{ 0,                          RDMA_SSIU_I_N(ssi, id) },
 613                   { 0,                          RDMA_SSIU_I_P(ssi, id) },
 614                   { 0,                          RDMA_SSIU_I_P(ssi, id) } } },
 615         };
 616
 617         /* it shouldn't happen */
 618         if (use_cmd && !use_src)
 619                 dev_err(dev, "DVC is selected without SRC\n");
 620
 621         /* use SSIU or SSI ? */
 622         if (is_ssi && rsnd_ssi_use_busif(io))
 623                 is_ssi++;
 624
 625         return (is_from) ?
 626                 dma_addrs[is_ssi][is_play][use_src + use_cmd].out_addr :
 627                 dma_addrs[is_ssi][is_play][use_src + use_cmd].in_addr;
 628 }
 629
 630 static dma_addr_t rsnd_dma_addr(struct rsnd_dai_stream *io,
 631                                 struct rsnd_mod *mod,
 632                                 int is_play, int is_from)
 633 {
 634         struct rsnd_priv *priv = rsnd_io_to_priv(io);
 635
 636         /*
 637          * gen1 uses default DMA addr
 638          */
 639         if (rsnd_is_gen1(priv))
 640                 return 0;
 641
 642         if (!mod)
 643                 return 0;
 644
 645         return rsnd_gen2_dma_addr(io, mod, is_play, is_from);
 646 }
 647
 648 #define MOD_MAX (RSND_MOD_MAX + 1) /* +Memory */
 649 static void rsnd_dma_of_path(struct rsnd_mod *this,
 650                              struct rsnd_dai_stream *io,
 651                              int is_play,
 652                              struct rsnd_mod **mod_from,
 653                              struct rsnd_mod **mod_to)
 654 {
 655         struct rsnd_mod *ssi = rsnd_io_to_mod_ssi(io);
 656         struct rsnd_mod *src = rsnd_io_to_mod_src(io);
 657         struct rsnd_mod *ctu = rsnd_io_to_mod_ctu(io);
 658         struct rsnd_mod *mix = rsnd_io_to_mod_mix(io);
 659         struct rsnd_mod *dvc = rsnd_io_to_mod_dvc(io);
 660         struct rsnd_mod *mod[MOD_MAX];
 661         struct rsnd_mod *mod_start, *mod_end;
 662         struct rsnd_priv *priv = rsnd_mod_to_priv(this);
 663         struct device *dev = rsnd_priv_to_dev(priv);
 664         int nr, i, idx;
 665
 666         if (!ssi)
 667                 return;
 668
 669         nr = 0;
 670         for (i = 0; i < MOD_MAX; i++) {
 671                 mod[i] = NULL;
 672                 nr += !!rsnd_io_to_mod(io, i);
 673         }
 674
 675         /*
 676          * [S] -*-> [E]
 677          * [S] -*-> SRC -o-> [E]
 678          * [S] -*-> SRC -> DVC -o-> [E]
 679          * [S] -*-> SRC -> CTU -> MIX -> DVC -o-> [E]
 680          *
 681          * playback     [S] = mem
 682          *              [E] = SSI
 683          *
 684          * capture      [S] = SSI
 685          *              [E] = mem
 686          *
 687          * -*->         Audio DMAC
 688          * -o->         Audio DMAC peri peri
 689          */
 690         mod_start       = (is_play) ? NULL : ssi;
 691         mod_end         = (is_play) ? ssi  : NULL;
 692
 693         idx = 0;
 694         mod[idx++] = mod_start;
 695         for (i = 1; i < nr; i++) {
 696                 if (src) {
 697                         mod[idx++] = src;
 698                         src = NULL;
 699                 } else if (ctu) {
 700                         mod[idx++] = ctu;
 701                         ctu = NULL;
 702                 } else if (mix) {
 703                         mod[idx++] = mix;
 704                         mix = NULL;
 705                 } else if (dvc) {
 706                         mod[idx++] = dvc;
 707                         dvc = NULL;
 708                 }
 709         }
 710         mod[idx] = mod_end;
 711
 712         /*
 713          *              | SSI | SRC |
 714          * -------------+-----+-----+
 715          *  is_play     |  o  |  *  |
 716          * !is_play     |  *  |  o  |
 717          */
 718         if ((this == ssi) == (is_play)) {
 719                 *mod_from       = mod[idx - 1];
 720                 *mod_to         = mod[idx];
 721         } else {
 722                 *mod_from       = mod[0];
 723                 *mod_to         = mod[1];
 724         }
 725
 726         dev_dbg(dev, "module connection (this is %s[%d])\n",
 727                 rsnd_mod_name(this), rsnd_mod_id(this));
 728         for (i = 0; i <= idx; i++) {
 729                 dev_dbg(dev, "  %s[%d]%s\n",
 730                        rsnd_mod_name(mod[i]), rsnd_mod_id(mod[i]),
 731                        (mod[i] == *mod_from) ? " from" :
 732                        (mod[i] == *mod_to)   ? " to" : "");
 733         }
 734 }
 735
 736 int rsnd_dma_attach(struct rsnd_dai_stream *io, struct rsnd_mod *mod,
 737                     struct rsnd_mod **dma_mod)
 738 {
 739         struct rsnd_mod *mod_from = NULL;
 740         struct rsnd_mod *mod_to = NULL;
 741         struct rsnd_priv *priv = rsnd_io_to_priv(io);
 742         struct rsnd_dma_ctrl *dmac = rsnd_priv_to_dmac(priv);
 743         struct device *dev = rsnd_priv_to_dev(priv);
 744         struct rsnd_mod_ops *ops;
 745         enum rsnd_mod_type type;
 746         int (*attach)(struct rsnd_dai_stream *io, struct rsnd_dma *dma,
 747                       struct rsnd_mod *mod_from, struct rsnd_mod *mod_to);
 748         int is_play = rsnd_io_is_play(io);
 749         int ret, dma_id;
 750
 751         /*
 752          * DMA failed. try to PIO mode
 753          * see
 754          *      rsnd_ssi_fallback()
 755          *      rsnd_rdai_continuance_probe()
 756          */
 757         if (!dmac)
 758                 return -EAGAIN;
 759
 760         rsnd_dma_of_path(mod, io, is_play, &mod_from, &mod_to);
 761
 762         /* for Gen2 */
 763         if (mod_from && mod_to) {
 764                 ops     = &rsnd_dmapp_ops;
 765                 attach  = rsnd_dmapp_attach;
 766                 dma_id  = dmac->dmapp_num;
 767                 type    = RSND_MOD_AUDMAPP;
 768         } else {
 769                 ops     = &rsnd_dmaen_ops;
 770                 attach  = rsnd_dmaen_attach;
 771                 dma_id  = dmac->dmaen_num;
 772                 type    = RSND_MOD_AUDMA;
 773         }
 774
 775         /* for Gen1, overwrite */
 776         if (rsnd_is_gen1(priv)) {
 777                 ops     = &rsnd_dmaen_ops;
 778                 attach  = rsnd_dmaen_attach;
 779                 dma_id  = dmac->dmaen_num;
 780                 type    = RSND_MOD_AUDMA;
 781         }
 782
 783         if (!(*dma_mod)) {
 784                 struct rsnd_dma *dma;
 785
 786                 dma = devm_kzalloc(dev, sizeof(*dma), GFP_KERNEL);
 787                 if (!dma)
 788                         return -ENOMEM;
 789
 790                 *dma_mod = rsnd_mod_get(dma);
 791
 792                 ret = rsnd_mod_init(priv, *dma_mod, ops, NULL,
 793                                     rsnd_mod_get_status, type, dma_id);
 794                 if (ret < 0)
 795                         return ret;
 796
 797                 dev_dbg(dev, "%s[%d] %s[%d] -> %s[%d]\n",
 798                         rsnd_mod_name(*dma_mod), rsnd_mod_id(*dma_mod),
 799                         rsnd_mod_name(mod_from), rsnd_mod_id(mod_from),
 800                         rsnd_mod_name(mod_to),   rsnd_mod_id(mod_to));
 801
 802                 ret = attach(io, dma, mod_from, mod_to);
 803                 if (ret < 0)
 804                         return ret;
 805
 806                 dma->src_addr = rsnd_dma_addr(io, mod_from, is_play, 1);
 807                 dma->dst_addr = rsnd_dma_addr(io, mod_to,   is_play, 0);
 808                 dma->mod_from = mod_from;
 809                 dma->mod_to   = mod_to;
 810         }
 811
 812         ret = rsnd_dai_connect(*dma_mod, io, type);
 813         if (ret < 0)
 814                 return ret;
 815
 816         return 0;
 817 }
 818
 819 int rsnd_dma_probe(struct rsnd_priv *priv)
 820 {
 821         struct platform_device *pdev = rsnd_priv_to_pdev(priv);
 822         struct device *dev = rsnd_priv_to_dev(priv);
 823         struct rsnd_dma_ctrl *dmac;
 824         struct resource *res;
 825
 826         /*
 827          * for Gen1
 828          */
 829         if (rsnd_is_gen1(priv))
 830                 return 0;
 831
 832         /*
 833          * for Gen2
 834          */
 835         res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "audmapp");
 836         dmac = devm_kzalloc(dev, sizeof(*dmac), GFP_KERNEL);
 837         if (!dmac || !res) {
 838                 dev_err(dev, "dma allocate failed\n");
 839                 return 0; /* it will be PIO mode */
 840         }
 841
 842         dmac->dmapp_num = 0;
 843         dmac->base = devm_ioremap_resource(dev, res);
 844         if (IS_ERR(dmac->base))
 845                 return PTR_ERR(dmac->base);
 846
 847         priv->dma = dmac;
 848
 849         return 0;
 850 }