root/sound/soc/sh/rcar/dma.c

DEFINITIONS

1. __rsnd_dmaen_complete
2. rsnd_dmaen_complete
3. rsnd_dmaen_request_channel
4. rsnd_dmaen_stop
5. rsnd_dmaen_cleanup
6. rsnd_dmaen_prepare
7. rsnd_dmaen_start
8. rsnd_dma_request_channel
9. rsnd_dmaen_attach
10. rsnd_dmaen_pointer
11. rsnd_dmapp_get_id
12. rsnd_dmapp_get_chcr
13. rsnd_dmapp_write
14. rsnd_dmapp_read
15. rsnd_dmapp_bset
16. rsnd_dmapp_stop
17. rsnd_dmapp_start
18. rsnd_dmapp_attach
19. rsnd_gen2_dma_addr
20. rsnd_dma_addr
21. rsnd_dma_of_path
22. rsnd_dma_alloc
23. rsnd_dma_attach
24. rsnd_dma_probe

   1 // SPDX-License-Identifier: GPL-2.0
   2 //
   3 // Renesas R-Car Audio DMAC support
   4 //
   5 // Copyright (C) 2015 Renesas Electronics Corp.
   6 // Copyright (c) 2015 Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
   7 
   8 #include <linux/delay.h>
   9 #include <linux/of_dma.h>
  10 #include "rsnd.h"
  11 
  12 /*
  13  * Audio DMAC peri peri register
  14  */
  15 #define PDMASAR         0x00
  16 #define PDMADAR         0x04
  17 #define PDMACHCR        0x0c
  18 
  19 /* PDMACHCR */
  20 #define PDMACHCR_DE             (1 << 0)
  21 
  22 
  23 struct rsnd_dmaen {
  24         struct dma_chan         *chan;
  25         dma_cookie_t            cookie;
  26         unsigned int            dma_len;
  27 };
  28 
  29 struct rsnd_dmapp {
  30         int                     dmapp_id;
  31         u32                     chcr;
  32 };
  33 
  34 struct rsnd_dma {
  35         struct rsnd_mod         mod;
  36         struct rsnd_mod         *mod_from;
  37         struct rsnd_mod         *mod_to;
  38         dma_addr_t              src_addr;
  39         dma_addr_t              dst_addr;
  40         union {
  41                 struct rsnd_dmaen en;
  42                 struct rsnd_dmapp pp;
  43         } dma;
  44 };
  45 
  46 struct rsnd_dma_ctrl {
  47         void __iomem *base;
  48         int dmaen_num;
  49         int dmapp_num;
  50 };
  51 
  52 #define rsnd_priv_to_dmac(p)    ((struct rsnd_dma_ctrl *)(p)->dma)
  53 #define rsnd_mod_to_dma(_mod) container_of((_mod), struct rsnd_dma, mod)
  54 #define rsnd_dma_to_dmaen(dma)  (&(dma)->dma.en)
  55 #define rsnd_dma_to_dmapp(dma)  (&(dma)->dma.pp)
  56 
  57 /* for DEBUG */
  58 static struct rsnd_mod_ops mem_ops = {
  59         .name = "mem",
  60 };
  61 
  62 static struct rsnd_mod mem = {
  63 };
  64 
  65 /*
  66  *              Audio DMAC
  67  */
  68 static void __rsnd_dmaen_complete(struct rsnd_mod *mod,
  69                                   struct rsnd_dai_stream *io)
  70 {
  71         if (rsnd_io_is_working(io))
  72                 rsnd_dai_period_elapsed(io);
  73 }
  74 
  75 static void rsnd_dmaen_complete(void *data)
  76 {
  77         struct rsnd_mod *mod = data;
  78 
  79         rsnd_mod_interrupt(mod, __rsnd_dmaen_complete);
  80 }
  81 
  82 static struct dma_chan *rsnd_dmaen_request_channel(struct rsnd_dai_stream *io,
  83                                                    struct rsnd_mod *mod_from,
  84                                                    struct rsnd_mod *mod_to)
  85 {
  86         if ((!mod_from && !mod_to) ||
  87             (mod_from && mod_to))
  88                 return NULL;
  89 
  90         if (mod_from)
  91                 return rsnd_mod_dma_req(io, mod_from);
  92         else
  93                 return rsnd_mod_dma_req(io, mod_to);
  94 }
  95 
  96 static int rsnd_dmaen_stop(struct rsnd_mod *mod,
  97                            struct rsnd_dai_stream *io,
  98                            struct rsnd_priv *priv)
  99 {
 100         struct rsnd_dma *dma = rsnd_mod_to_dma(mod);
 101         struct rsnd_dmaen *dmaen = rsnd_dma_to_dmaen(dma);
 102 
 103         if (dmaen->chan)
 104                 dmaengine_terminate_all(dmaen->chan);
 105 
 106         return 0;
 107 }
 108 
 109 static int rsnd_dmaen_cleanup(struct rsnd_mod *mod,
 110                               struct rsnd_dai_stream *io,
 111                               struct rsnd_priv *priv)
 112 {
 113         struct rsnd_dma *dma = rsnd_mod_to_dma(mod);
 114         struct rsnd_dmaen *dmaen = rsnd_dma_to_dmaen(dma);
 115 
 116         /*
 117          * DMAEngine release uses mutex lock.
 118          * Thus, it shouldn't be called under spinlock.
 119          * Let's call it under prepare
 120          */
 121         if (dmaen->chan)
 122                 dma_release_channel(dmaen->chan);
 123 
 124         dmaen->chan = NULL;
 125 
 126         return 0;
 127 }
 128 
 129 static int rsnd_dmaen_prepare(struct rsnd_mod *mod,
 130                               struct rsnd_dai_stream *io,
 131                               struct rsnd_priv *priv)
 132 {
 133         struct rsnd_dma *dma = rsnd_mod_to_dma(mod);
 134         struct rsnd_dmaen *dmaen = rsnd_dma_to_dmaen(dma);
 135         struct device *dev = rsnd_priv_to_dev(priv);
 136 
 137         /* maybe suspended */
 138         if (dmaen->chan)
 139                 return 0;
 140 
 141         /*
 142          * DMAEngine request uses mutex lock.
 143          * Thus, it shouldn't be called under spinlock.
 144          * Let's call it under prepare
 145          */
 146         dmaen->chan = rsnd_dmaen_request_channel(io,
 147                                                  dma->mod_from,
 148                                                  dma->mod_to);
 149         if (IS_ERR_OR_NULL(dmaen->chan)) {
 150                 dmaen->chan = NULL;
 151                 dev_err(dev, "can't get dma channel\n");
 152                 return -EIO;
 153         }
 154 
 155         return 0;
 156 }
 157 
 158 static int rsnd_dmaen_start(struct rsnd_mod *mod,
 159                             struct rsnd_dai_stream *io,
 160                             struct rsnd_priv *priv)
 161 {
 162         struct rsnd_dma *dma = rsnd_mod_to_dma(mod);
 163         struct rsnd_dmaen *dmaen = rsnd_dma_to_dmaen(dma);
 164         struct snd_pcm_substream *substream = io->substream;
 165         struct device *dev = rsnd_priv_to_dev(priv);
 166         struct dma_async_tx_descriptor *desc;
 167         struct dma_slave_config cfg = {};
 168         int is_play = rsnd_io_is_play(io);
 169         int ret;
 170 
 171         cfg.direction   = is_play ? DMA_MEM_TO_DEV : DMA_DEV_TO_MEM;
 172         cfg.src_addr    = dma->src_addr;
 173         cfg.dst_addr    = dma->dst_addr;
 174         cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
 175         cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
 176 
 177         dev_dbg(dev, "%s %pad -> %pad\n",
 178                 rsnd_mod_name(mod),
 179                 &cfg.src_addr, &cfg.dst_addr);
 180 
 181         ret = dmaengine_slave_config(dmaen->chan, &cfg);
 182         if (ret < 0)
 183                 return ret;
 184 
 185         desc = dmaengine_prep_dma_cyclic(dmaen->chan,
 186                                          substream->runtime->dma_addr,
 187                                          snd_pcm_lib_buffer_bytes(substream),
 188                                          snd_pcm_lib_period_bytes(substream),
 189                                          is_play ? DMA_MEM_TO_DEV : DMA_DEV_TO_MEM,
 190                                          DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
 191 
 192         if (!desc) {
 193                 dev_err(dev, "dmaengine_prep_slave_sg() fail\n");
 194                 return -EIO;
 195         }
 196 
 197         desc->callback          = rsnd_dmaen_complete;
 198         desc->callback_param    = rsnd_mod_get(dma);
 199 
 200         dmaen->dma_len          = snd_pcm_lib_buffer_bytes(substream);
 201 
 202         dmaen->cookie = dmaengine_submit(desc);
 203         if (dmaen->cookie < 0) {
 204                 dev_err(dev, "dmaengine_submit() fail\n");
 205                 return -EIO;
 206         }
 207 
 208         dma_async_issue_pending(dmaen->chan);
 209 
 210         return 0;
 211 }
 212 
 213 struct dma_chan *rsnd_dma_request_channel(struct device_node *of_node,
 214                                           struct rsnd_mod *mod, char *name)
 215 {
 216         struct dma_chan *chan = NULL;
 217         struct device_node *np;
 218         int i = 0;
 219 
 220         for_each_child_of_node(of_node, np) {
 221                 if (i == rsnd_mod_id_raw(mod) && (!chan))
 222                         chan = of_dma_request_slave_channel(np, name);
 223                 i++;
 224         }
 225 
 226         /* It should call of_node_put(), since, it is rsnd_xxx_of_node() */
 227         of_node_put(of_node);
 228 
 229         return chan;
 230 }
 231 
 232 static int rsnd_dmaen_attach(struct rsnd_dai_stream *io,
 233                            struct rsnd_dma *dma,
 234                            struct rsnd_mod *mod_from, struct rsnd_mod *mod_to)
 235 {
 236         struct rsnd_priv *priv = rsnd_io_to_priv(io);
 237         struct rsnd_dma_ctrl *dmac = rsnd_priv_to_dmac(priv);
 238         struct dma_chan *chan;
 239 
 240         /* try to get DMAEngine channel */
 241         chan = rsnd_dmaen_request_channel(io, mod_from, mod_to);
 242         if (IS_ERR_OR_NULL(chan)) {
 243                 /* Let's follow when -EPROBE_DEFER case */
 244                 if (PTR_ERR(chan) == -EPROBE_DEFER)
 245                         return PTR_ERR(chan);
 246 
 247                 /*
 248                  * DMA failed. try to PIO mode
 249                  * see
 250                  *      rsnd_ssi_fallback()
 251                  *      rsnd_rdai_continuance_probe()
 252                  */
 253                 return -EAGAIN;
 254         }
 255 
 256         /*
 257          * use it for IPMMU if needed
 258          * see
 259          *      rsnd_preallocate_pages()
 260          */
 261         io->dmac_dev = chan->device->dev;
 262 
 263         dma_release_channel(chan);
 264 
 265         dmac->dmaen_num++;
 266 
 267         return 0;
 268 }
 269 
 270 static int rsnd_dmaen_pointer(struct rsnd_mod *mod,
 271                               struct rsnd_dai_stream *io,
 272                               snd_pcm_uframes_t *pointer)
 273 {
 274         struct snd_pcm_runtime *runtime = rsnd_io_to_runtime(io);
 275         struct rsnd_dma *dma = rsnd_mod_to_dma(mod);
 276         struct rsnd_dmaen *dmaen = rsnd_dma_to_dmaen(dma);
 277         struct dma_tx_state state;
 278         enum dma_status status;
 279         unsigned int pos = 0;
 280 
 281         status = dmaengine_tx_status(dmaen->chan, dmaen->cookie, &state);
 282         if (status == DMA_IN_PROGRESS || status == DMA_PAUSED) {
 283                 if (state.residue > 0 && state.residue <= dmaen->dma_len)
 284                         pos = dmaen->dma_len - state.residue;
 285         }
 286         *pointer = bytes_to_frames(runtime, pos);
 287 
 288         return 0;
 289 }
 290 
 291 static struct rsnd_mod_ops rsnd_dmaen_ops = {
 292         .name           = "audmac",
 293         .prepare        = rsnd_dmaen_prepare,
 294         .cleanup        = rsnd_dmaen_cleanup,
 295         .start          = rsnd_dmaen_start,
 296         .stop           = rsnd_dmaen_stop,
 297         .pointer        = rsnd_dmaen_pointer,
 298         .get_status     = rsnd_mod_get_status,
 299 };
 300 
 301 /*
 302  *              Audio DMAC peri peri
 303  */
 304 static const u8 gen2_id_table_ssiu[] = {
 305         /* SSI00 ~ SSI07 */
 306         0x00, 0x01, 0x02, 0x03, 0x39, 0x3a, 0x3b, 0x3c,
 307         /* SSI10 ~ SSI17 */
 308         0x04, 0x05, 0x06, 0x07, 0x3d, 0x3e, 0x3f, 0x40,
 309         /* SSI20 ~ SSI27 */
 310         0x08, 0x09, 0x0a, 0x0b, 0x41, 0x42, 0x43, 0x44,
 311         /* SSI30 ~ SSI37 */
 312         0x0c, 0x45, 0x46, 0x47, 0x48, 0x49, 0x4a, 0x4b,
 313         /* SSI40 ~ SSI47 */
 314         0x0d, 0x4c, 0x4d, 0x4e, 0x4f, 0x50, 0x51, 0x52,
 315         /* SSI5 */
 316         0x0e, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 317         /* SSI6 */
 318         0x0f, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 319         /* SSI7 */
 320         0x10, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 321         /* SSI8 */
 322         0x11, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 323         /* SSI90 ~ SSI97 */
 324         0x12, 0x13, 0x14, 0x15, 0x53, 0x54, 0x55, 0x56,
 325 };
 326 static const u8 gen2_id_table_scu[] = {
 327         0x2d, /* SCU_SRCI0 */
 328         0x2e, /* SCU_SRCI1 */
 329         0x2f, /* SCU_SRCI2 */
 330         0x30, /* SCU_SRCI3 */
 331         0x31, /* SCU_SRCI4 */
 332         0x32, /* SCU_SRCI5 */
 333         0x33, /* SCU_SRCI6 */
 334         0x34, /* SCU_SRCI7 */
 335         0x35, /* SCU_SRCI8 */
 336         0x36, /* SCU_SRCI9 */
 337 };
 338 static const u8 gen2_id_table_cmd[] = {
 339         0x37, /* SCU_CMD0 */
 340         0x38, /* SCU_CMD1 */
 341 };
 342 
 343 static u32 rsnd_dmapp_get_id(struct rsnd_dai_stream *io,
 344                              struct rsnd_mod *mod)
 345 {
 346         struct rsnd_mod *ssi = rsnd_io_to_mod_ssi(io);
 347         struct rsnd_mod *ssiu = rsnd_io_to_mod_ssiu(io);
 348         struct rsnd_mod *src = rsnd_io_to_mod_src(io);
 349         struct rsnd_mod *dvc = rsnd_io_to_mod_dvc(io);
 350         const u8 *entry = NULL;
 351         int id = 255;
 352         int size = 0;
 353 
 354         if ((mod == ssi) ||
 355             (mod == ssiu)) {
 356                 int busif = rsnd_mod_id_sub(ssiu);
 357 
 358                 entry = gen2_id_table_ssiu;
 359                 size = ARRAY_SIZE(gen2_id_table_ssiu);
 360                 id = (rsnd_mod_id(mod) * 8) + busif;
 361         } else if (mod == src) {
 362                 entry = gen2_id_table_scu;
 363                 size = ARRAY_SIZE(gen2_id_table_scu);
 364                 id = rsnd_mod_id(mod);
 365         } else if (mod == dvc) {
 366                 entry = gen2_id_table_cmd;
 367                 size = ARRAY_SIZE(gen2_id_table_cmd);
 368                 id = rsnd_mod_id(mod);
 369         }
 370 
 371         if ((!entry) || (size <= id)) {
 372                 struct device *dev = rsnd_priv_to_dev(rsnd_io_to_priv(io));
 373 
 374                 dev_err(dev, "unknown connection (%s)\n", rsnd_mod_name(mod));
 375 
 376                 /* use non-prohibited SRS number as error */
 377                 return 0x00; /* SSI00 */
 378         }
 379 
 380         return entry[id];
 381 }
 382 
 383 static u32 rsnd_dmapp_get_chcr(struct rsnd_dai_stream *io,
 384                                struct rsnd_mod *mod_from,
 385                                struct rsnd_mod *mod_to)
 386 {
 387         return  (rsnd_dmapp_get_id(io, mod_from) << 24) +
 388                 (rsnd_dmapp_get_id(io, mod_to) << 16);
 389 }
 390 
 391 #define rsnd_dmapp_addr(dmac, dma, reg) \
 392         (dmac->base + 0x20 + reg + \
 393          (0x10 * rsnd_dma_to_dmapp(dma)->dmapp_id))
 394 static void rsnd_dmapp_write(struct rsnd_dma *dma, u32 data, u32 reg)
 395 {
 396         struct rsnd_mod *mod = rsnd_mod_get(dma);
 397         struct rsnd_priv *priv = rsnd_mod_to_priv(mod);
 398         struct rsnd_dma_ctrl *dmac = rsnd_priv_to_dmac(priv);
 399         struct device *dev = rsnd_priv_to_dev(priv);
 400 
 401         dev_dbg(dev, "w 0x%px : %08x\n", rsnd_dmapp_addr(dmac, dma, reg), data);
 402 
 403         iowrite32(data, rsnd_dmapp_addr(dmac, dma, reg));
 404 }
 405 
 406 static u32 rsnd_dmapp_read(struct rsnd_dma *dma, u32 reg)
 407 {
 408         struct rsnd_mod *mod = rsnd_mod_get(dma);
 409         struct rsnd_priv *priv = rsnd_mod_to_priv(mod);
 410         struct rsnd_dma_ctrl *dmac = rsnd_priv_to_dmac(priv);
 411 
 412         return ioread32(rsnd_dmapp_addr(dmac, dma, reg));
 413 }
 414 
 415 static void rsnd_dmapp_bset(struct rsnd_dma *dma, u32 data, u32 mask, u32 reg)
 416 {
 417         struct rsnd_mod *mod = rsnd_mod_get(dma);
 418         struct rsnd_priv *priv = rsnd_mod_to_priv(mod);
 419         struct rsnd_dma_ctrl *dmac = rsnd_priv_to_dmac(priv);
 420         void __iomem *addr = rsnd_dmapp_addr(dmac, dma, reg);
 421         u32 val = ioread32(addr);
 422 
 423         val &= ~mask;
 424         val |= (data & mask);
 425 
 426         iowrite32(val, addr);
 427 }
 428 
 429 static int rsnd_dmapp_stop(struct rsnd_mod *mod,
 430                            struct rsnd_dai_stream *io,
 431                            struct rsnd_priv *priv)
 432 {
 433         struct rsnd_dma *dma = rsnd_mod_to_dma(mod);
 434         int i;
 435 
 436         rsnd_dmapp_bset(dma, 0,  PDMACHCR_DE, PDMACHCR);
 437 
 438         for (i = 0; i < 1024; i++) {
 439                 if (0 == (rsnd_dmapp_read(dma, PDMACHCR) & PDMACHCR_DE))
 440                         return 0;
 441                 udelay(1);
 442         }
 443 
 444         return -EIO;
 445 }
 446 
 447 static int rsnd_dmapp_start(struct rsnd_mod *mod,
 448                             struct rsnd_dai_stream *io,
 449                             struct rsnd_priv *priv)
 450 {
 451         struct rsnd_dma *dma = rsnd_mod_to_dma(mod);
 452         struct rsnd_dmapp *dmapp = rsnd_dma_to_dmapp(dma);
 453 
 454         rsnd_dmapp_write(dma, dma->src_addr,    PDMASAR);
 455         rsnd_dmapp_write(dma, dma->dst_addr,    PDMADAR);
 456         rsnd_dmapp_write(dma, dmapp->chcr,      PDMACHCR);
 457 
 458         return 0;
 459 }
 460 
 461 static int rsnd_dmapp_attach(struct rsnd_dai_stream *io,
 462                              struct rsnd_dma *dma,
 463                              struct rsnd_mod *mod_from, struct rsnd_mod *mod_to)
 464 {
 465         struct rsnd_dmapp *dmapp = rsnd_dma_to_dmapp(dma);
 466         struct rsnd_priv *priv = rsnd_io_to_priv(io);
 467         struct rsnd_dma_ctrl *dmac = rsnd_priv_to_dmac(priv);
 468         struct device *dev = rsnd_priv_to_dev(priv);
 469 
 470         dmapp->dmapp_id = dmac->dmapp_num;
 471         dmapp->chcr = rsnd_dmapp_get_chcr(io, mod_from, mod_to) | PDMACHCR_DE;
 472 
 473         dmac->dmapp_num++;
 474 
 475         dev_dbg(dev, "id/src/dst/chcr = %d/%pad/%pad/%08x\n",
 476                 dmapp->dmapp_id, &dma->src_addr, &dma->dst_addr, dmapp->chcr);
 477 
 478         return 0;
 479 }
 480 
 481 static struct rsnd_mod_ops rsnd_dmapp_ops = {
 482         .name           = "audmac-pp",
 483         .start          = rsnd_dmapp_start,
 484         .stop           = rsnd_dmapp_stop,
 485         .quit           = rsnd_dmapp_stop,
 486         .get_status     = rsnd_mod_get_status,
 487 };
 488 
 489 /*
 490  *              Common DMAC Interface
 491  */
 492 
 493 /*
 494  *      DMA read/write register offset
 495  *
 496  *      RSND_xxx_I_N    for Audio DMAC input
 497  *      RSND_xxx_O_N    for Audio DMAC output
 498  *      RSND_xxx_I_P    for Audio DMAC peri peri input
 499  *      RSND_xxx_O_P    for Audio DMAC peri peri output
 500  *
 501  *      ex) R-Car H2 case
 502  *            mod        / DMAC in    / DMAC out   / DMAC PP in / DMAC pp out
 503  *      SSI : 0xec541000 / 0xec241008 / 0xec24100c
 504  *      SSIU: 0xec541000 / 0xec100000 / 0xec100000 / 0xec400000 / 0xec400000
 505  *      SCU : 0xec500000 / 0xec000000 / 0xec004000 / 0xec300000 / 0xec304000
 506  *      CMD : 0xec500000 /            / 0xec008000                0xec308000
 507  */
 508 #define RDMA_SSI_I_N(addr, i)   (addr ##_reg - 0x00300000 + (0x40 * i) + 0x8)
 509 #define RDMA_SSI_O_N(addr, i)   (addr ##_reg - 0x00300000 + (0x40 * i) + 0xc)
 510 
 511 #define RDMA_SSIU_I_N(addr, i, j) (addr ##_reg - 0x00441000 + (0x1000 * (i)) + (((j) / 4) * 0xA000) + (((j) % 4) * 0x400) - (0x4000 * ((i) / 9) * ((j) / 4)))
 512 #define RDMA_SSIU_O_N(addr, i, j) RDMA_SSIU_I_N(addr, i, j)
 513 
 514 #define RDMA_SSIU_I_P(addr, i, j) (addr ##_reg - 0x00141000 + (0x1000 * (i)) + (((j) / 4) * 0xA000) + (((j) % 4) * 0x400) - (0x4000 * ((i) / 9) * ((j) / 4)))
 515 #define RDMA_SSIU_O_P(addr, i, j) RDMA_SSIU_I_P(addr, i, j)
 516 
 517 #define RDMA_SRC_I_N(addr, i)   (addr ##_reg - 0x00500000 + (0x400 * i))
 518 #define RDMA_SRC_O_N(addr, i)   (addr ##_reg - 0x004fc000 + (0x400 * i))
 519 
 520 #define RDMA_SRC_I_P(addr, i)   (addr ##_reg - 0x00200000 + (0x400 * i))
 521 #define RDMA_SRC_O_P(addr, i)   (addr ##_reg - 0x001fc000 + (0x400 * i))
 522 
 523 #define RDMA_CMD_O_N(addr, i)   (addr ##_reg - 0x004f8000 + (0x400 * i))
 524 #define RDMA_CMD_O_P(addr, i)   (addr ##_reg - 0x001f8000 + (0x400 * i))
 525 
 526 static dma_addr_t
 527 rsnd_gen2_dma_addr(struct rsnd_dai_stream *io,
 528                    struct rsnd_mod *mod,
 529                    int is_play, int is_from)
 530 {
 531         struct rsnd_priv *priv = rsnd_io_to_priv(io);
 532         struct device *dev = rsnd_priv_to_dev(priv);
 533         phys_addr_t ssi_reg = rsnd_gen_get_phy_addr(priv, RSND_GEN2_SSI);
 534         phys_addr_t src_reg = rsnd_gen_get_phy_addr(priv, RSND_GEN2_SCU);
 535         int is_ssi = !!(rsnd_io_to_mod_ssi(io) == mod) ||
 536                      !!(rsnd_io_to_mod_ssiu(io) == mod);
 537         int use_src = !!rsnd_io_to_mod_src(io);
 538         int use_cmd = !!rsnd_io_to_mod_dvc(io) ||
 539                       !!rsnd_io_to_mod_mix(io) ||
 540                       !!rsnd_io_to_mod_ctu(io);
 541         int id = rsnd_mod_id(mod);
 542         int busif = rsnd_mod_id_sub(rsnd_io_to_mod_ssiu(io));
 543         struct dma_addr {
 544                 dma_addr_t out_addr;
 545                 dma_addr_t in_addr;
 546         } dma_addrs[3][2][3] = {
 547                 /* SRC */
 548                 /* Capture */
 549                 {{{ 0,                          0 },
 550                   { RDMA_SRC_O_N(src, id),      RDMA_SRC_I_P(src, id) },
 551                   { RDMA_CMD_O_N(src, id),      RDMA_SRC_I_P(src, id) } },
 552                  /* Playback */
 553                  {{ 0,                          0, },
 554                   { RDMA_SRC_O_P(src, id),      RDMA_SRC_I_N(src, id) },
 555                   { RDMA_CMD_O_P(src, id),      RDMA_SRC_I_N(src, id) } }
 556                 },
 557                 /* SSI */
 558                 /* Capture */
 559                 {{{ RDMA_SSI_O_N(ssi, id),              0 },
 560                   { RDMA_SSIU_O_P(ssi, id, busif),      0 },
 561                   { RDMA_SSIU_O_P(ssi, id, busif),      0 } },
 562                  /* Playback */
 563                  {{ 0,                  RDMA_SSI_I_N(ssi, id) },
 564                   { 0,                  RDMA_SSIU_I_P(ssi, id, busif) },
 565                   { 0,                  RDMA_SSIU_I_P(ssi, id, busif) } }
 566                 },
 567                 /* SSIU */
 568                 /* Capture */
 569                 {{{ RDMA_SSIU_O_N(ssi, id, busif),      0 },
 570                   { RDMA_SSIU_O_P(ssi, id, busif),      0 },
 571                   { RDMA_SSIU_O_P(ssi, id, busif),      0 } },
 572                  /* Playback */
 573                  {{ 0,                  RDMA_SSIU_I_N(ssi, id, busif) },
 574                   { 0,                  RDMA_SSIU_I_P(ssi, id, busif) },
 575                   { 0,                  RDMA_SSIU_I_P(ssi, id, busif) } } },
 576         };
 577 
 578         /*
 579          * FIXME
 580          *
 581          * We can't support SSI9-4/5/6/7, because its address is
 582          * out of calculation rule
 583          */
 584         if ((id == 9) && (busif >= 4))
 585                 dev_err(dev, "This driver doesn't support SSI%d-%d, so far",
 586                         id, busif);
 587 
 588         /* it shouldn't happen */
 589         if (use_cmd && !use_src)
 590                 dev_err(dev, "DVC is selected without SRC\n");
 591 
 592         /* use SSIU or SSI ? */
 593         if (is_ssi && rsnd_ssi_use_busif(io))
 594                 is_ssi++;
 595 
 596         return (is_from) ?
 597                 dma_addrs[is_ssi][is_play][use_src + use_cmd].out_addr :
 598                 dma_addrs[is_ssi][is_play][use_src + use_cmd].in_addr;
 599 }
 600 
 601 static dma_addr_t rsnd_dma_addr(struct rsnd_dai_stream *io,
 602                                 struct rsnd_mod *mod,
 603                                 int is_play, int is_from)
 604 {
 605         struct rsnd_priv *priv = rsnd_io_to_priv(io);
 606 
 607         /*
 608          * gen1 uses default DMA addr
 609          */
 610         if (rsnd_is_gen1(priv))
 611                 return 0;
 612 
 613         if (!mod)
 614                 return 0;
 615 
 616         return rsnd_gen2_dma_addr(io, mod, is_play, is_from);
 617 }
 618 
 619 #define MOD_MAX (RSND_MOD_MAX + 1) /* +Memory */
 620 static void rsnd_dma_of_path(struct rsnd_mod *this,
 621                              struct rsnd_dai_stream *io,
 622                              int is_play,
 623                              struct rsnd_mod **mod_from,
 624                              struct rsnd_mod **mod_to)
 625 {
 626         struct rsnd_mod *ssi;
 627         struct rsnd_mod *src = rsnd_io_to_mod_src(io);
 628         struct rsnd_mod *ctu = rsnd_io_to_mod_ctu(io);
 629         struct rsnd_mod *mix = rsnd_io_to_mod_mix(io);
 630         struct rsnd_mod *dvc = rsnd_io_to_mod_dvc(io);
 631         struct rsnd_mod *mod[MOD_MAX];
 632         struct rsnd_mod *mod_start, *mod_end;
 633         struct rsnd_priv *priv = rsnd_mod_to_priv(this);
 634         struct device *dev = rsnd_priv_to_dev(priv);
 635         int nr, i, idx;
 636 
 637         /*
 638          * It should use "rcar_sound,ssiu" on DT.
 639          * But, we need to keep compatibility for old version.
 640          *
 641          * If it has "rcar_sound.ssiu", it will be used.
 642          * If not, "rcar_sound.ssi" will be used.
 643          * see
 644          *      rsnd_ssiu_dma_req()
 645          *      rsnd_ssi_dma_req()
 646          */
 647         if (rsnd_ssiu_of_node(priv)) {
 648                 struct rsnd_mod *ssiu = rsnd_io_to_mod_ssiu(io);
 649 
 650                 /* use SSIU */
 651                 ssi = ssiu;
 652                 if (this == rsnd_io_to_mod_ssi(io))
 653                         this = ssiu;
 654         } else {
 655                 /* keep compatible, use SSI */
 656                 ssi = rsnd_io_to_mod_ssi(io);
 657         }
 658 
 659         if (!ssi)
 660                 return;
 661 
 662         nr = 0;
 663         for (i = 0; i < MOD_MAX; i++) {
 664                 mod[i] = NULL;
 665                 nr += !!rsnd_io_to_mod(io, i);
 666         }
 667 
 668         /*
 669          * [S] -*-> [E]
 670          * [S] -*-> SRC -o-> [E]
 671          * [S] -*-> SRC -> DVC -o-> [E]
 672          * [S] -*-> SRC -> CTU -> MIX -> DVC -o-> [E]
 673          *
 674          * playback     [S] = mem
 675          *              [E] = SSI
 676          *
 677          * capture      [S] = SSI
 678          *              [E] = mem
 679          *
 680          * -*->         Audio DMAC
 681          * -o->         Audio DMAC peri peri
 682          */
 683         mod_start       = (is_play) ? NULL : ssi;
 684         mod_end         = (is_play) ? ssi  : NULL;
 685 
 686         idx = 0;
 687         mod[idx++] = mod_start;
 688         for (i = 1; i < nr; i++) {
 689                 if (src) {
 690                         mod[idx++] = src;
 691                         src = NULL;
 692                 } else if (ctu) {
 693                         mod[idx++] = ctu;
 694                         ctu = NULL;
 695                 } else if (mix) {
 696                         mod[idx++] = mix;
 697                         mix = NULL;
 698                 } else if (dvc) {
 699                         mod[idx++] = dvc;
 700                         dvc = NULL;
 701                 }
 702         }
 703         mod[idx] = mod_end;
 704 
 705         /*
 706          *              | SSI | SRC |
 707          * -------------+-----+-----+
 708          *  is_play     |  o  |  *  |
 709          * !is_play     |  *  |  o  |
 710          */
 711         if ((this == ssi) == (is_play)) {
 712                 *mod_from       = mod[idx - 1];
 713                 *mod_to         = mod[idx];
 714         } else {
 715                 *mod_from       = mod[0];
 716                 *mod_to         = mod[1];
 717         }
 718 
 719         dev_dbg(dev, "module connection (this is %s)\n", rsnd_mod_name(this));
 720         for (i = 0; i <= idx; i++) {
 721                 dev_dbg(dev, "  %s%s\n",
 722                         rsnd_mod_name(mod[i] ? mod[i] : &mem),
 723                         (mod[i] == *mod_from) ? " from" :
 724                         (mod[i] == *mod_to)   ? " to" : "");
 725         }
 726 }
 727 
 728 static int rsnd_dma_alloc(struct rsnd_dai_stream *io, struct rsnd_mod *mod,
 729                           struct rsnd_mod **dma_mod)
 730 {
 731         struct rsnd_mod *mod_from = NULL;
 732         struct rsnd_mod *mod_to = NULL;
 733         struct rsnd_priv *priv = rsnd_io_to_priv(io);
 734         struct rsnd_dma_ctrl *dmac = rsnd_priv_to_dmac(priv);
 735         struct device *dev = rsnd_priv_to_dev(priv);
 736         struct rsnd_dma *dma;
 737         struct rsnd_mod_ops *ops;
 738         enum rsnd_mod_type type;
 739         int (*attach)(struct rsnd_dai_stream *io, struct rsnd_dma *dma,
 740                       struct rsnd_mod *mod_from, struct rsnd_mod *mod_to);
 741         int is_play = rsnd_io_is_play(io);
 742         int ret, dma_id;
 743 
 744         /*
 745          * DMA failed. try to PIO mode
 746          * see
 747          *      rsnd_ssi_fallback()
 748          *      rsnd_rdai_continuance_probe()
 749          */
 750         if (!dmac)
 751                 return -EAGAIN;
 752 
 753         rsnd_dma_of_path(mod, io, is_play, &mod_from, &mod_to);
 754 
 755         /* for Gen2 or later */
 756         if (mod_from && mod_to) {
 757                 ops     = &rsnd_dmapp_ops;
 758                 attach  = rsnd_dmapp_attach;
 759                 dma_id  = dmac->dmapp_num;
 760                 type    = RSND_MOD_AUDMAPP;
 761         } else {
 762                 ops     = &rsnd_dmaen_ops;
 763                 attach  = rsnd_dmaen_attach;
 764                 dma_id  = dmac->dmaen_num;
 765                 type    = RSND_MOD_AUDMA;
 766         }
 767 
 768         /* for Gen1, overwrite */
 769         if (rsnd_is_gen1(priv)) {
 770                 ops     = &rsnd_dmaen_ops;
 771                 attach  = rsnd_dmaen_attach;
 772                 dma_id  = dmac->dmaen_num;
 773                 type    = RSND_MOD_AUDMA;
 774         }
 775 
 776         dma = devm_kzalloc(dev, sizeof(*dma), GFP_KERNEL);
 777         if (!dma)
 778                 return -ENOMEM;
 779 
 780         *dma_mod = rsnd_mod_get(dma);
 781 
 782         ret = rsnd_mod_init(priv, *dma_mod, ops, NULL,
 783                             type, dma_id);
 784         if (ret < 0)
 785                 return ret;
 786 
 787         dev_dbg(dev, "%s %s -> %s\n",
 788                 rsnd_mod_name(*dma_mod),
 789                 rsnd_mod_name(mod_from ? mod_from : &mem),
 790                 rsnd_mod_name(mod_to   ? mod_to   : &mem));
 791 
 792         ret = attach(io, dma, mod_from, mod_to);
 793         if (ret < 0)
 794                 return ret;
 795 
 796         dma->src_addr = rsnd_dma_addr(io, mod_from, is_play, 1);
 797         dma->dst_addr = rsnd_dma_addr(io, mod_to,   is_play, 0);
 798         dma->mod_from = mod_from;
 799         dma->mod_to   = mod_to;
 800 
 801         return 0;
 802 }
 803 
 804 int rsnd_dma_attach(struct rsnd_dai_stream *io, struct rsnd_mod *mod,
 805                     struct rsnd_mod **dma_mod)
 806 {
 807         if (!(*dma_mod)) {
 808                 int ret = rsnd_dma_alloc(io, mod, dma_mod);
 809 
 810                 if (ret < 0)
 811                         return ret;
 812         }
 813 
 814         return rsnd_dai_connect(*dma_mod, io, (*dma_mod)->type);
 815 }
 816 
 817 int rsnd_dma_probe(struct rsnd_priv *priv)
 818 {
 819         struct platform_device *pdev = rsnd_priv_to_pdev(priv);
 820         struct device *dev = rsnd_priv_to_dev(priv);
 821         struct rsnd_dma_ctrl *dmac;
 822         struct resource *res;
 823 
 824         /*
 825          * for Gen1
 826          */
 827         if (rsnd_is_gen1(priv))
 828                 return 0;
 829 
 830         /*
 831          * for Gen2 or later
 832          */
 833         res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "audmapp");
 834         dmac = devm_kzalloc(dev, sizeof(*dmac), GFP_KERNEL);
 835         if (!dmac || !res) {
 836                 dev_err(dev, "dma allocate failed\n");
 837                 return 0; /* it will be PIO mode */
 838         }
 839 
 840         dmac->dmapp_num = 0;
 841         dmac->base = devm_ioremap_resource(dev, res);
 842         if (IS_ERR(dmac->base))
 843                 return PTR_ERR(dmac->base);
 844 
 845         priv->dma = dmac;
 846 
 847         /* dummy mem mod for debug */
 848         return rsnd_mod_init(NULL, &mem, &mem_ops, NULL, 0, 0);
 849 }