LXR linux/sound/soc/sh/rcar/dma.c

   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
  23struct rsnd_dmaen {
  24        struct dma_chan         *chan;
  25        dma_cookie_t            cookie;
  26        unsigned int            dma_len;
  27};
  28
  29struct rsnd_dmapp {
  30        int                     dmapp_id;
  31        u32                     chcr;
  32};
  33
  34struct 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
  46struct 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 */
  58static struct rsnd_mod_ops mem_ops = {
  59        .name = "mem",
  60};
  61
  62static struct rsnd_mod mem = {
  63};
  64
  65/*
  66 *              Audio DMAC
  67 */
  68static 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
  75static void rsnd_dmaen_complete(void *data)
  76{
  77        struct rsnd_mod *mod = data;
  78
  79        rsnd_mod_interrupt(mod, __rsnd_dmaen_complete);
  80}
  81
  82static 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
  96static 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
 109static 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
 129static 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
 158static 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        enum dma_slave_buswidth buswidth = DMA_SLAVE_BUSWIDTH_4_BYTES;
 169        int is_play = rsnd_io_is_play(io);
 170        int ret;
 171
 172        /*
 173         * in case of monaural data writing or reading through Audio-DMAC
 174         * data is always in Left Justified format, so both src and dst
 175         * DMA Bus width need to be set equal to physical data width.
 176         */
 177        if (rsnd_runtime_channel_original(io) == 1) {
 178                struct snd_pcm_runtime *runtime = rsnd_io_to_runtime(io);
 179                int bits = snd_pcm_format_physical_width(runtime->format);
 180
 181                switch (bits) {
 182                case 8:
 183                        buswidth = DMA_SLAVE_BUSWIDTH_1_BYTE;
 184                        break;
 185                case 16:
 186                        buswidth = DMA_SLAVE_BUSWIDTH_2_BYTES;
 187                        break;
 188                case 32:
 189                        buswidth = DMA_SLAVE_BUSWIDTH_4_BYTES;
 190                        break;
 191                default:
 192                        dev_err(dev, "invalid format width %d\n", bits);
 193                        return -EINVAL;
 194                }
 195        }
 196
 197        cfg.direction   = is_play ? DMA_MEM_TO_DEV : DMA_DEV_TO_MEM;
 198        cfg.src_addr    = dma->src_addr;
 199        cfg.dst_addr    = dma->dst_addr;
 200        cfg.src_addr_width = buswidth;
 201        cfg.dst_addr_width = buswidth;
 202
 203        dev_dbg(dev, "%s %pad -> %pad\n",
 204                rsnd_mod_name(mod),
 205                &cfg.src_addr, &cfg.dst_addr);
 206
 207        ret = dmaengine_slave_config(dmaen->chan, &cfg);
 208        if (ret < 0)
 209                return ret;
 210
 211        desc = dmaengine_prep_dma_cyclic(dmaen->chan,
 212                                         substream->runtime->dma_addr,
 213                                         snd_pcm_lib_buffer_bytes(substream),
 214                                         snd_pcm_lib_period_bytes(substream),
 215                                         is_play ? DMA_MEM_TO_DEV : DMA_DEV_TO_MEM,
 216                                         DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
 217
 218        if (!desc) {
 219                dev_err(dev, "dmaengine_prep_slave_sg() fail\n");
 220                return -EIO;
 221        }
 222
 223        desc->callback          = rsnd_dmaen_complete;
 224        desc->callback_param    = rsnd_mod_get(dma);
 225
 226        dmaen->dma_len          = snd_pcm_lib_buffer_bytes(substream);
 227
 228        dmaen->cookie = dmaengine_submit(desc);
 229        if (dmaen->cookie < 0) {
 230                dev_err(dev, "dmaengine_submit() fail\n");
 231                return -EIO;
 232        }
 233
 234        dma_async_issue_pending(dmaen->chan);
 235
 236        return 0;
 237}
 238
 239struct dma_chan *rsnd_dma_request_channel(struct device_node *of_node,
 240                                          struct rsnd_mod *mod, char *name)
 241{
 242        struct dma_chan *chan = NULL;
 243        struct device_node *np;
 244        int i = 0;
 245
 246        for_each_child_of_node(of_node, np) {
 247                if (i == rsnd_mod_id_raw(mod) && (!chan))
 248                        chan = of_dma_request_slave_channel(np, name);
 249                i++;
 250        }
 251
 252        /* It should call of_node_put(), since, it is rsnd_xxx_of_node() */
 253        of_node_put(of_node);
 254
 255        return chan;
 256}
 257
 258static int rsnd_dmaen_attach(struct rsnd_dai_stream *io,
 259                           struct rsnd_dma *dma,
 260                           struct rsnd_mod *mod_from, struct rsnd_mod *mod_to)
 261{
 262        struct rsnd_priv *priv = rsnd_io_to_priv(io);
 263        struct rsnd_dma_ctrl *dmac = rsnd_priv_to_dmac(priv);
 264        struct dma_chan *chan;
 265
 266        /* try to get DMAEngine channel */
 267        chan = rsnd_dmaen_request_channel(io, mod_from, mod_to);
 268        if (IS_ERR_OR_NULL(chan)) {
 269                /* Let's follow when -EPROBE_DEFER case */
 270                if (PTR_ERR(chan) == -EPROBE_DEFER)
 271                        return PTR_ERR(chan);
 272
 273                /*
 274                 * DMA failed. try to PIO mode
 275                 * see
 276                 *      rsnd_ssi_fallback()
 277                 *      rsnd_rdai_continuance_probe()
 278                 */
 279                return -EAGAIN;
 280        }
 281
 282        /*
 283         * use it for IPMMU if needed
 284         * see
 285         *      rsnd_preallocate_pages()
 286         */
 287        io->dmac_dev = chan->device->dev;
 288
 289        dma_release_channel(chan);
 290
 291        dmac->dmaen_num++;
 292
 293        return 0;
 294}
 295
 296static int rsnd_dmaen_pointer(struct rsnd_mod *mod,
 297                              struct rsnd_dai_stream *io,
 298                              snd_pcm_uframes_t *pointer)
 299{
 300        struct snd_pcm_runtime *runtime = rsnd_io_to_runtime(io);
 301        struct rsnd_dma *dma = rsnd_mod_to_dma(mod);
 302        struct rsnd_dmaen *dmaen = rsnd_dma_to_dmaen(dma);
 303        struct dma_tx_state state;
 304        enum dma_status status;
 305        unsigned int pos = 0;
 306
 307        status = dmaengine_tx_status(dmaen->chan, dmaen->cookie, &state);
 308        if (status == DMA_IN_PROGRESS || status == DMA_PAUSED) {
 309                if (state.residue > 0 && state.residue <= dmaen->dma_len)
 310                        pos = dmaen->dma_len - state.residue;
 311        }
 312        *pointer = bytes_to_frames(runtime, pos);
 313
 314        return 0;
 315}
 316
 317static struct rsnd_mod_ops rsnd_dmaen_ops = {
 318        .name           = "audmac",
 319        .prepare        = rsnd_dmaen_prepare,
 320        .cleanup        = rsnd_dmaen_cleanup,
 321        .start          = rsnd_dmaen_start,
 322        .stop           = rsnd_dmaen_stop,
 323        .pointer        = rsnd_dmaen_pointer,
 324        .get_status     = rsnd_mod_get_status,
 325};
 326
 327/*
 328 *              Audio DMAC peri peri
 329 */
 330static const u8 gen2_id_table_ssiu[] = {
 331        /* SSI00 ~ SSI07 */
 332        0x00, 0x01, 0x02, 0x03, 0x39, 0x3a, 0x3b, 0x3c,
 333        /* SSI10 ~ SSI17 */
 334        0x04, 0x05, 0x06, 0x07, 0x3d, 0x3e, 0x3f, 0x40,
 335        /* SSI20 ~ SSI27 */
 336        0x08, 0x09, 0x0a, 0x0b, 0x41, 0x42, 0x43, 0x44,
 337        /* SSI30 ~ SSI37 */
 338        0x0c, 0x45, 0x46, 0x47, 0x48, 0x49, 0x4a, 0x4b,
 339        /* SSI40 ~ SSI47 */
 340        0x0d, 0x4c, 0x4d, 0x4e, 0x4f, 0x50, 0x51, 0x52,
 341        /* SSI5 */
 342        0x0e, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 343        /* SSI6 */
 344        0x0f, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 345        /* SSI7 */
 346        0x10, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 347        /* SSI8 */
 348        0x11, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 349        /* SSI90 ~ SSI97 */
 350        0x12, 0x13, 0x14, 0x15, 0x53, 0x54, 0x55, 0x56,
 351};
 352static const u8 gen2_id_table_scu[] = {
 353        0x2d, /* SCU_SRCI0 */
 354        0x2e, /* SCU_SRCI1 */
 355        0x2f, /* SCU_SRCI2 */
 356        0x30, /* SCU_SRCI3 */
 357        0x31, /* SCU_SRCI4 */
 358        0x32, /* SCU_SRCI5 */
 359        0x33, /* SCU_SRCI6 */
 360        0x34, /* SCU_SRCI7 */
 361        0x35, /* SCU_SRCI8 */
 362        0x36, /* SCU_SRCI9 */
 363};
 364static const u8 gen2_id_table_cmd[] = {
 365        0x37, /* SCU_CMD0 */
 366        0x38, /* SCU_CMD1 */
 367};
 368
 369static u32 rsnd_dmapp_get_id(struct rsnd_dai_stream *io,
 370                             struct rsnd_mod *mod)
 371{
 372        struct rsnd_mod *ssi = rsnd_io_to_mod_ssi(io);
 373        struct rsnd_mod *ssiu = rsnd_io_to_mod_ssiu(io);
 374        struct rsnd_mod *src = rsnd_io_to_mod_src(io);
 375        struct rsnd_mod *dvc = rsnd_io_to_mod_dvc(io);
 376        const u8 *entry = NULL;
 377        int id = 255;
 378        int size = 0;
 379
 380        if ((mod == ssi) ||
 381            (mod == ssiu)) {
 382                int busif = rsnd_mod_id_sub(ssiu);
 383
 384                entry = gen2_id_table_ssiu;
 385                size = ARRAY_SIZE(gen2_id_table_ssiu);
 386                id = (rsnd_mod_id(mod) * 8) + busif;
 387        } else if (mod == src) {
 388                entry = gen2_id_table_scu;
 389                size = ARRAY_SIZE(gen2_id_table_scu);
 390                id = rsnd_mod_id(mod);
 391        } else if (mod == dvc) {
 392                entry = gen2_id_table_cmd;
 393                size = ARRAY_SIZE(gen2_id_table_cmd);
 394                id = rsnd_mod_id(mod);
 395        }
 396
 397        if ((!entry) || (size <= id)) {
 398                struct device *dev = rsnd_priv_to_dev(rsnd_io_to_priv(io));
 399
 400                dev_err(dev, "unknown connection (%s)\n", rsnd_mod_name(mod));
 401
 402                /* use non-prohibited SRS number as error */
 403                return 0x00; /* SSI00 */
 404        }
 405
 406        return entry[id];
 407}
 408
 409static u32 rsnd_dmapp_get_chcr(struct rsnd_dai_stream *io,
 410                               struct rsnd_mod *mod_from,
 411                               struct rsnd_mod *mod_to)
 412{
 413        return  (rsnd_dmapp_get_id(io, mod_from) << 24) +
 414                (rsnd_dmapp_get_id(io, mod_to) << 16);
 415}
 416
 417#define rsnd_dmapp_addr(dmac, dma, reg) \
 418        (dmac->base + 0x20 + reg + \
 419         (0x10 * rsnd_dma_to_dmapp(dma)->dmapp_id))
 420static void rsnd_dmapp_write(struct rsnd_dma *dma, u32 data, u32 reg)
 421{
 422        struct rsnd_mod *mod = rsnd_mod_get(dma);
 423        struct rsnd_priv *priv = rsnd_mod_to_priv(mod);
 424        struct rsnd_dma_ctrl *dmac = rsnd_priv_to_dmac(priv);
 425        struct device *dev = rsnd_priv_to_dev(priv);
 426
 427        dev_dbg(dev, "w 0x%px : %08x\n", rsnd_dmapp_addr(dmac, dma, reg), data);
 428
 429        iowrite32(data, rsnd_dmapp_addr(dmac, dma, reg));
 430}
 431
 432static u32 rsnd_dmapp_read(struct rsnd_dma *dma, u32 reg)
 433{
 434        struct rsnd_mod *mod = rsnd_mod_get(dma);
 435        struct rsnd_priv *priv = rsnd_mod_to_priv(mod);
 436        struct rsnd_dma_ctrl *dmac = rsnd_priv_to_dmac(priv);
 437
 438        return ioread32(rsnd_dmapp_addr(dmac, dma, reg));
 439}
 440
 441static void rsnd_dmapp_bset(struct rsnd_dma *dma, u32 data, u32 mask, u32 reg)
 442{
 443        struct rsnd_mod *mod = rsnd_mod_get(dma);
 444        struct rsnd_priv *priv = rsnd_mod_to_priv(mod);
 445        struct rsnd_dma_ctrl *dmac = rsnd_priv_to_dmac(priv);
 446        void __iomem *addr = rsnd_dmapp_addr(dmac, dma, reg);
 447        u32 val = ioread32(addr);
 448
 449        val &= ~mask;
 450        val |= (data & mask);
 451
 452        iowrite32(val, addr);
 453}
 454
 455static int rsnd_dmapp_stop(struct rsnd_mod *mod,
 456                           struct rsnd_dai_stream *io,
 457                           struct rsnd_priv *priv)
 458{
 459        struct rsnd_dma *dma = rsnd_mod_to_dma(mod);
 460        int i;
 461
 462        rsnd_dmapp_bset(dma, 0,  PDMACHCR_DE, PDMACHCR);
 463
 464        for (i = 0; i < 1024; i++) {
 465                if (0 == (rsnd_dmapp_read(dma, PDMACHCR) & PDMACHCR_DE))
 466                        return 0;
 467                udelay(1);
 468        }
 469
 470        return -EIO;
 471}
 472
 473static int rsnd_dmapp_start(struct rsnd_mod *mod,
 474                            struct rsnd_dai_stream *io,
 475                            struct rsnd_priv *priv)
 476{
 477        struct rsnd_dma *dma = rsnd_mod_to_dma(mod);
 478        struct rsnd_dmapp *dmapp = rsnd_dma_to_dmapp(dma);
 479
 480        rsnd_dmapp_write(dma, dma->src_addr,    PDMASAR);
 481        rsnd_dmapp_write(dma, dma->dst_addr,    PDMADAR);
 482        rsnd_dmapp_write(dma, dmapp->chcr,      PDMACHCR);
 483
 484        return 0;
 485}
 486
 487static int rsnd_dmapp_attach(struct rsnd_dai_stream *io,
 488                             struct rsnd_dma *dma,
 489                             struct rsnd_mod *mod_from, struct rsnd_mod *mod_to)
 490{
 491        struct rsnd_dmapp *dmapp = rsnd_dma_to_dmapp(dma);
 492        struct rsnd_priv *priv = rsnd_io_to_priv(io);
 493        struct rsnd_dma_ctrl *dmac = rsnd_priv_to_dmac(priv);
 494        struct device *dev = rsnd_priv_to_dev(priv);
 495
 496        dmapp->dmapp_id = dmac->dmapp_num;
 497        dmapp->chcr = rsnd_dmapp_get_chcr(io, mod_from, mod_to) | PDMACHCR_DE;
 498
 499        dmac->dmapp_num++;
 500
 501        dev_dbg(dev, "id/src/dst/chcr = %d/%pad/%pad/%08x\n",
 502                dmapp->dmapp_id, &dma->src_addr, &dma->dst_addr, dmapp->chcr);
 503
 504        return 0;
 505}
 506
 507static struct rsnd_mod_ops rsnd_dmapp_ops = {
 508        .name           = "audmac-pp",
 509        .start          = rsnd_dmapp_start,
 510        .stop           = rsnd_dmapp_stop,
 511        .quit           = rsnd_dmapp_stop,
 512        .get_status     = rsnd_mod_get_status,
 513};
 514
 515/*
 516 *              Common DMAC Interface
 517 */
 518
 519/*
 520 *      DMA read/write register offset
 521 *
 522 *      RSND_xxx_I_N    for Audio DMAC input
 523 *      RSND_xxx_O_N    for Audio DMAC output
 524 *      RSND_xxx_I_P    for Audio DMAC peri peri input
 525 *      RSND_xxx_O_P    for Audio DMAC peri peri output
 526 *
 527 *      ex) R-Car H2 case
 528 *            mod        / DMAC in    / DMAC out   / DMAC PP in / DMAC pp out
 529 *      SSI : 0xec541000 / 0xec241008 / 0xec24100c
 530 *      SSIU: 0xec541000 / 0xec100000 / 0xec100000 / 0xec400000 / 0xec400000
 531 *      SCU : 0xec500000 / 0xec000000 / 0xec004000 / 0xec300000 / 0xec304000
 532 *      CMD : 0xec500000 /            / 0xec008000                0xec308000
 533 */
 534#define RDMA_SSI_I_N(addr, i)   (addr ##_reg - 0x00300000 + (0x40 * i) + 0x8)
 535#define RDMA_SSI_O_N(addr, i)   (addr ##_reg - 0x00300000 + (0x40 * i) + 0xc)
 536
 537#define RDMA_SSIU_I_N(addr, i, j) (addr ##_reg - 0x00441000 + (0x1000 * (i)) + (((j) / 4) * 0xA000) + (((j) % 4) * 0x400) - (0x4000 * ((i) / 9) * ((j) / 4)))
 538#define RDMA_SSIU_O_N(addr, i, j) RDMA_SSIU_I_N(addr, i, j)
 539
 540#define RDMA_SSIU_I_P(addr, i, j) (addr ##_reg - 0x00141000 + (0x1000 * (i)) + (((j) / 4) * 0xA000) + (((j) % 4) * 0x400) - (0x4000 * ((i) / 9) * ((j) / 4)))
 541#define RDMA_SSIU_O_P(addr, i, j) RDMA_SSIU_I_P(addr, i, j)
 542
 543#define RDMA_SRC_I_N(addr, i)   (addr ##_reg - 0x00500000 + (0x400 * i))
 544#define RDMA_SRC_O_N(addr, i)   (addr ##_reg - 0x004fc000 + (0x400 * i))
 545
 546#define RDMA_SRC_I_P(addr, i)   (addr ##_reg - 0x00200000 + (0x400 * i))
 547#define RDMA_SRC_O_P(addr, i)   (addr ##_reg - 0x001fc000 + (0x400 * i))
 548
 549#define RDMA_CMD_O_N(addr, i)   (addr ##_reg - 0x004f8000 + (0x400 * i))
 550#define RDMA_CMD_O_P(addr, i)   (addr ##_reg - 0x001f8000 + (0x400 * i))
 551
 552static dma_addr_t
 553rsnd_gen2_dma_addr(struct rsnd_dai_stream *io,
 554                   struct rsnd_mod *mod,
 555                   int is_play, int is_from)
 556{
 557        struct rsnd_priv *priv = rsnd_io_to_priv(io);
 558        struct device *dev = rsnd_priv_to_dev(priv);
 559        phys_addr_t ssi_reg = rsnd_gen_get_phy_addr(priv, RSND_GEN2_SSI);
 560        phys_addr_t src_reg = rsnd_gen_get_phy_addr(priv, RSND_GEN2_SCU);
 561        int is_ssi = !!(rsnd_io_to_mod_ssi(io) == mod) ||
 562                     !!(rsnd_io_to_mod_ssiu(io) == mod);
 563        int use_src = !!rsnd_io_to_mod_src(io);
 564        int use_cmd = !!rsnd_io_to_mod_dvc(io) ||
 565                      !!rsnd_io_to_mod_mix(io) ||
 566                      !!rsnd_io_to_mod_ctu(io);
 567        int id = rsnd_mod_id(mod);
 568        int busif = rsnd_mod_id_sub(rsnd_io_to_mod_ssiu(io));
 569        struct dma_addr {
 570                dma_addr_t out_addr;
 571                dma_addr_t in_addr;
 572        } dma_addrs[3][2][3] = {
 573                /* SRC */
 574                /* Capture */
 575                {{{ 0,                          0 },
 576                  { RDMA_SRC_O_N(src, id),      RDMA_SRC_I_P(src, id) },
 577                  { RDMA_CMD_O_N(src, id),      RDMA_SRC_I_P(src, id) } },
 578                 /* Playback */
 579                 {{ 0,                          0, },
 580                  { RDMA_SRC_O_P(src, id),      RDMA_SRC_I_N(src, id) },
 581                  { RDMA_CMD_O_P(src, id),      RDMA_SRC_I_N(src, id) } }
 582                },
 583                /* SSI */
 584                /* Capture */
 585                {{{ RDMA_SSI_O_N(ssi, id),              0 },
 586                  { RDMA_SSIU_O_P(ssi, id, busif),      0 },
 587                  { RDMA_SSIU_O_P(ssi, id, busif),      0 } },
 588                 /* Playback */
 589                 {{ 0,                  RDMA_SSI_I_N(ssi, id) },
 590                  { 0,                  RDMA_SSIU_I_P(ssi, id, busif) },
 591                  { 0,                  RDMA_SSIU_I_P(ssi, id, busif) } }
 592                },
 593                /* SSIU */
 594                /* Capture */
 595                {{{ RDMA_SSIU_O_N(ssi, id, busif),      0 },
 596                  { RDMA_SSIU_O_P(ssi, id, busif),      0 },
 597                  { RDMA_SSIU_O_P(ssi, id, busif),      0 } },
 598                 /* Playback */
 599                 {{ 0,                  RDMA_SSIU_I_N(ssi, id, busif) },
 600                  { 0,                  RDMA_SSIU_I_P(ssi, id, busif) },
 601                  { 0,                  RDMA_SSIU_I_P(ssi, id, busif) } } },
 602        };
 603
 604        /*
 605         * FIXME
 606         *
 607         * We can't support SSI9-4/5/6/7, because its address is
 608         * out of calculation rule
 609         */
 610        if ((id == 9) && (busif >= 4))
 611                dev_err(dev, "This driver doesn't support SSI%d-%d, so far",
 612                        id, busif);
 613
 614        /* it shouldn't happen */
 615        if (use_cmd && !use_src)
 616                dev_err(dev, "DVC is selected without SRC\n");
 617
 618        /* use SSIU or SSI ? */
 619        if (is_ssi && rsnd_ssi_use_busif(io))
 620                is_ssi++;
 621
 622        return (is_from) ?
 623                dma_addrs[is_ssi][is_play][use_src + use_cmd].out_addr :
 624                dma_addrs[is_ssi][is_play][use_src + use_cmd].in_addr;
 625}
 626
 627static dma_addr_t rsnd_dma_addr(struct rsnd_dai_stream *io,
 628                                struct rsnd_mod *mod,
 629                                int is_play, int is_from)
 630{
 631        struct rsnd_priv *priv = rsnd_io_to_priv(io);
 632
 633        /*
 634         * gen1 uses default DMA addr
 635         */
 636        if (rsnd_is_gen1(priv))
 637                return 0;
 638
 639        if (!mod)
 640                return 0;
 641
 642        return rsnd_gen2_dma_addr(io, mod, is_play, is_from);
 643}
 644
 645#define MOD_MAX (RSND_MOD_MAX + 1) /* +Memory */
 646static void rsnd_dma_of_path(struct rsnd_mod *this,
 647                             struct rsnd_dai_stream *io,
 648                             int is_play,
 649                             struct rsnd_mod **mod_from,
 650                             struct rsnd_mod **mod_to)
 651{
 652        struct rsnd_mod *ssi;
 653        struct rsnd_mod *src = rsnd_io_to_mod_src(io);
 654        struct rsnd_mod *ctu = rsnd_io_to_mod_ctu(io);
 655        struct rsnd_mod *mix = rsnd_io_to_mod_mix(io);
 656        struct rsnd_mod *dvc = rsnd_io_to_mod_dvc(io);
 657        struct rsnd_mod *mod[MOD_MAX];
 658        struct rsnd_mod *mod_start, *mod_end;
 659        struct rsnd_priv *priv = rsnd_mod_to_priv(this);
 660        struct device *dev = rsnd_priv_to_dev(priv);
 661        int nr, i, idx;
 662
 663        /*
 664         * It should use "rcar_sound,ssiu" on DT.
 665         * But, we need to keep compatibility for old version.
 666         *
 667         * If it has "rcar_sound.ssiu", it will be used.
 668         * If not, "rcar_sound.ssi" will be used.
 669         * see
 670         *      rsnd_ssiu_dma_req()
 671         *      rsnd_ssi_dma_req()
 672         */
 673        if (rsnd_ssiu_of_node(priv)) {
 674                struct rsnd_mod *ssiu = rsnd_io_to_mod_ssiu(io);
 675
 676                /* use SSIU */
 677                ssi = ssiu;
 678                if (this == rsnd_io_to_mod_ssi(io))
 679                        this = ssiu;
 680        } else {
 681                /* keep compatible, use SSI */
 682                ssi = rsnd_io_to_mod_ssi(io);
 683        }
 684
 685        if (!ssi)
 686                return;
 687
 688        nr = 0;
 689        for (i = 0; i < MOD_MAX; i++) {
 690                mod[i] = NULL;
 691                nr += !!rsnd_io_to_mod(io, i);
 692        }
 693
 694        /*
 695         * [S] -*-> [E]
 696         * [S] -*-> SRC -o-> [E]
 697         * [S] -*-> SRC -> DVC -o-> [E]
 698         * [S] -*-> SRC -> CTU -> MIX -> DVC -o-> [E]
 699         *
 700         * playback     [S] = mem
 701         *              [E] = SSI
 702         *
 703         * capture      [S] = SSI
 704         *              [E] = mem
 705         *
 706         * -*->         Audio DMAC
 707         * -o->         Audio DMAC peri peri
 708         */
 709        mod_start       = (is_play) ? NULL : ssi;
 710        mod_end         = (is_play) ? ssi  : NULL;
 711
 712        idx = 0;
 713        mod[idx++] = mod_start;
 714        for (i = 1; i < nr; i++) {
 715                if (src) {
 716                        mod[idx++] = src;
 717                        src = NULL;
 718                } else if (ctu) {
 719                        mod[idx++] = ctu;
 720                        ctu = NULL;
 721                } else if (mix) {
 722                        mod[idx++] = mix;
 723                        mix = NULL;
 724                } else if (dvc) {
 725                        mod[idx++] = dvc;
 726                        dvc = NULL;
 727                }
 728        }
 729        mod[idx] = mod_end;
 730
 731        /*
 732         *              | SSI | SRC |
 733         * -------------+-----+-----+
 734         *  is_play     |  o  |  *  |
 735         * !is_play     |  *  |  o  |
 736         */
 737        if ((this == ssi) == (is_play)) {
 738                *mod_from       = mod[idx - 1];
 739                *mod_to         = mod[idx];
 740        } else {
 741                *mod_from       = mod[0];
 742                *mod_to         = mod[1];
 743        }
 744
 745        dev_dbg(dev, "module connection (this is %s)\n", rsnd_mod_name(this));
 746        for (i = 0; i <= idx; i++) {
 747                dev_dbg(dev, "  %s%s\n",
 748                        rsnd_mod_name(mod[i] ? mod[i] : &mem),
 749                        (mod[i] == *mod_from) ? " from" :
 750                        (mod[i] == *mod_to)   ? " to" : "");
 751        }
 752}
 753
 754static int rsnd_dma_alloc(struct rsnd_dai_stream *io, struct rsnd_mod *mod,
 755                          struct rsnd_mod **dma_mod)
 756{
 757        struct rsnd_mod *mod_from = NULL;
 758        struct rsnd_mod *mod_to = NULL;
 759        struct rsnd_priv *priv = rsnd_io_to_priv(io);
 760        struct rsnd_dma_ctrl *dmac = rsnd_priv_to_dmac(priv);
 761        struct device *dev = rsnd_priv_to_dev(priv);
 762        struct rsnd_dma *dma;
 763        struct rsnd_mod_ops *ops;
 764        enum rsnd_mod_type type;
 765        int (*attach)(struct rsnd_dai_stream *io, struct rsnd_dma *dma,
 766                      struct rsnd_mod *mod_from, struct rsnd_mod *mod_to);
 767        int is_play = rsnd_io_is_play(io);
 768        int ret, dma_id;
 769
 770        /*
 771         * DMA failed. try to PIO mode
 772         * see
 773         *      rsnd_ssi_fallback()
 774         *      rsnd_rdai_continuance_probe()
 775         */
 776        if (!dmac)
 777                return -EAGAIN;
 778
 779        rsnd_dma_of_path(mod, io, is_play, &mod_from, &mod_to);
 780
 781        /* for Gen2 or later */
 782        if (mod_from && mod_to) {
 783                ops     = &rsnd_dmapp_ops;
 784                attach  = rsnd_dmapp_attach;
 785                dma_id  = dmac->dmapp_num;
 786                type    = RSND_MOD_AUDMAPP;
 787        } else {
 788                ops     = &rsnd_dmaen_ops;
 789                attach  = rsnd_dmaen_attach;
 790                dma_id  = dmac->dmaen_num;
 791                type    = RSND_MOD_AUDMA;
 792        }
 793
 794        /* for Gen1, overwrite */
 795        if (rsnd_is_gen1(priv)) {
 796                ops     = &rsnd_dmaen_ops;
 797                attach  = rsnd_dmaen_attach;
 798                dma_id  = dmac->dmaen_num;
 799                type    = RSND_MOD_AUDMA;
 800        }
 801
 802        dma = devm_kzalloc(dev, sizeof(*dma), GFP_KERNEL);
 803        if (!dma)
 804                return -ENOMEM;
 805
 806        *dma_mod = rsnd_mod_get(dma);
 807
 808        ret = rsnd_mod_init(priv, *dma_mod, ops, NULL,
 809                            type, dma_id);
 810        if (ret < 0)
 811                return ret;
 812
 813        dev_dbg(dev, "%s %s -> %s\n",
 814                rsnd_mod_name(*dma_mod),
 815                rsnd_mod_name(mod_from ? mod_from : &mem),
 816                rsnd_mod_name(mod_to   ? mod_to   : &mem));
 817
 818        ret = attach(io, dma, mod_from, mod_to);
 819        if (ret < 0)
 820                return ret;
 821
 822        dma->src_addr = rsnd_dma_addr(io, mod_from, is_play, 1);
 823        dma->dst_addr = rsnd_dma_addr(io, mod_to,   is_play, 0);
 824        dma->mod_from = mod_from;
 825        dma->mod_to   = mod_to;
 826
 827        return 0;
 828}
 829
 830int rsnd_dma_attach(struct rsnd_dai_stream *io, struct rsnd_mod *mod,
 831                    struct rsnd_mod **dma_mod)
 832{
 833        if (!(*dma_mod)) {
 834                int ret = rsnd_dma_alloc(io, mod, dma_mod);
 835
 836                if (ret < 0)
 837                        return ret;
 838        }
 839
 840        return rsnd_dai_connect(*dma_mod, io, (*dma_mod)->type);
 841}
 842
 843int rsnd_dma_probe(struct rsnd_priv *priv)
 844{
 845        struct platform_device *pdev = rsnd_priv_to_pdev(priv);
 846        struct device *dev = rsnd_priv_to_dev(priv);
 847        struct rsnd_dma_ctrl *dmac;
 848        struct resource *res;
 849
 850        /*
 851         * for Gen1
 852         */
 853        if (rsnd_is_gen1(priv))
 854                return 0;
 855
 856        /*
 857         * for Gen2 or later
 858         */
 859        res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "audmapp");
 860        dmac = devm_kzalloc(dev, sizeof(*dmac), GFP_KERNEL);
 861        if (!dmac || !res) {
 862                dev_err(dev, "dma allocate failed\n");
 863                return 0; /* it will be PIO mode */
 864        }
 865
 866        dmac->dmapp_num = 0;
 867        dmac->base = devm_ioremap_resource(dev, res);
 868        if (IS_ERR(dmac->base))
 869                return PTR_ERR(dmac->base);
 870
 871        priv->dma = dmac;
 872
 873        /* dummy mem mod for debug */
 874        return rsnd_mod_init(NULL, &mem, &mem_ops, NULL, 0, 0);
 875}
 876