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 *ppbase;
  48        phys_addr_t ppres;
  49        int dmaen_num;
  50        int dmapp_num;
  51};
  52
  53#define rsnd_priv_to_dmac(p)    ((struct rsnd_dma_ctrl *)(p)->dma)
  54#define rsnd_mod_to_dma(_mod) container_of((_mod), struct rsnd_dma, mod)
  55#define rsnd_dma_to_dmaen(dma)  (&(dma)->dma.en)
  56#define rsnd_dma_to_dmapp(dma)  (&(dma)->dma.pp)
  57
  58/* for DEBUG */
  59static struct rsnd_mod_ops mem_ops = {
  60        .name = "mem",
  61};
  62
  63static struct rsnd_mod mem = {
  64};
  65
  66/*
  67 *              Audio DMAC
  68 */
  69static void __rsnd_dmaen_complete(struct rsnd_mod *mod,
  70                                  struct rsnd_dai_stream *io)
  71{
  72        if (rsnd_io_is_working(io))
  73                rsnd_dai_period_elapsed(io);
  74}
  75
  76static void rsnd_dmaen_complete(void *data)
  77{
  78        struct rsnd_mod *mod = data;
  79
  80        rsnd_mod_interrupt(mod, __rsnd_dmaen_complete);
  81}
  82
  83static struct dma_chan *rsnd_dmaen_request_channel(struct rsnd_dai_stream *io,
  84                                                   struct rsnd_mod *mod_from,
  85                                                   struct rsnd_mod *mod_to)
  86{
  87        if ((!mod_from && !mod_to) ||
  88            (mod_from && mod_to))
  89                return NULL;
  90
  91        if (mod_from)
  92                return rsnd_mod_dma_req(io, mod_from);
  93        else
  94                return rsnd_mod_dma_req(io, mod_to);
  95}
  96
  97static int rsnd_dmaen_stop(struct rsnd_mod *mod,
  98                           struct rsnd_dai_stream *io,
  99                           struct rsnd_priv *priv)
 100{
 101        struct rsnd_dma *dma = rsnd_mod_to_dma(mod);
 102        struct rsnd_dmaen *dmaen = rsnd_dma_to_dmaen(dma);
 103
 104        if (dmaen->chan)
 105                dmaengine_terminate_all(dmaen->chan);
 106
 107        return 0;
 108}
 109
 110static int rsnd_dmaen_cleanup(struct rsnd_mod *mod,
 111                              struct rsnd_dai_stream *io,
 112                              struct rsnd_priv *priv)
 113{
 114        struct rsnd_dma *dma = rsnd_mod_to_dma(mod);
 115        struct rsnd_dmaen *dmaen = rsnd_dma_to_dmaen(dma);
 116
 117        /*
 118         * DMAEngine release uses mutex lock.
 119         * Thus, it shouldn't be called under spinlock.
 120         * Let's call it under prepare
 121         */
 122        if (dmaen->chan)
 123                dma_release_channel(dmaen->chan);
 124
 125        dmaen->chan = NULL;
 126
 127        return 0;
 128}
 129
 130static int rsnd_dmaen_prepare(struct rsnd_mod *mod,
 131                              struct rsnd_dai_stream *io,
 132                              struct rsnd_priv *priv)
 133{
 134        struct rsnd_dma *dma = rsnd_mod_to_dma(mod);
 135        struct rsnd_dmaen *dmaen = rsnd_dma_to_dmaen(dma);
 136        struct device *dev = rsnd_priv_to_dev(priv);
 137
 138        /* maybe suspended */
 139        if (dmaen->chan)
 140                return 0;
 141
 142        /*
 143         * DMAEngine request uses mutex lock.
 144         * Thus, it shouldn't be called under spinlock.
 145         * Let's call it under prepare
 146         */
 147        dmaen->chan = rsnd_dmaen_request_channel(io,
 148                                                 dma->mod_from,
 149                                                 dma->mod_to);
 150        if (IS_ERR_OR_NULL(dmaen->chan)) {
 151                dmaen->chan = NULL;
 152                dev_err(dev, "can't get dma channel\n");
 153                return -EIO;
 154        }
 155
 156        return 0;
 157}
 158
 159static int rsnd_dmaen_start(struct rsnd_mod *mod,
 160                            struct rsnd_dai_stream *io,
 161                            struct rsnd_priv *priv)
 162{
 163        struct rsnd_dma *dma = rsnd_mod_to_dma(mod);
 164        struct rsnd_dmaen *dmaen = rsnd_dma_to_dmaen(dma);
 165        struct snd_pcm_substream *substream = io->substream;
 166        struct device *dev = rsnd_priv_to_dev(priv);
 167        struct dma_async_tx_descriptor *desc;
 168        struct dma_slave_config cfg = {};
 169        enum dma_slave_buswidth buswidth = DMA_SLAVE_BUSWIDTH_4_BYTES;
 170        int is_play = rsnd_io_is_play(io);
 171        int ret;
 172
 173        /*
 174         * in case of monaural data writing or reading through Audio-DMAC
 175         * data is always in Left Justified format, so both src and dst
 176         * DMA Bus width need to be set equal to physical data width.
 177         */
 178        if (rsnd_runtime_channel_original(io) == 1) {
 179                struct snd_pcm_runtime *runtime = rsnd_io_to_runtime(io);
 180                int bits = snd_pcm_format_physical_width(runtime->format);
 181
 182                switch (bits) {
 183                case 8:
 184                        buswidth = DMA_SLAVE_BUSWIDTH_1_BYTE;
 185                        break;
 186                case 16:
 187                        buswidth = DMA_SLAVE_BUSWIDTH_2_BYTES;
 188                        break;
 189                case 32:
 190                        buswidth = DMA_SLAVE_BUSWIDTH_4_BYTES;
 191                        break;
 192                default:
 193                        dev_err(dev, "invalid format width %d\n", bits);
 194                        return -EINVAL;
 195                }
 196        }
 197
 198        cfg.direction   = is_play ? DMA_MEM_TO_DEV : DMA_DEV_TO_MEM;
 199        cfg.src_addr    = dma->src_addr;
 200        cfg.dst_addr    = dma->dst_addr;
 201        cfg.src_addr_width = buswidth;
 202        cfg.dst_addr_width = buswidth;
 203
 204        dev_dbg(dev, "%s %pad -> %pad\n",
 205                rsnd_mod_name(mod),
 206                &cfg.src_addr, &cfg.dst_addr);
 207
 208        ret = dmaengine_slave_config(dmaen->chan, &cfg);
 209        if (ret < 0)
 210                return ret;
 211
 212        desc = dmaengine_prep_dma_cyclic(dmaen->chan,
 213                                         substream->runtime->dma_addr,
 214                                         snd_pcm_lib_buffer_bytes(substream),
 215                                         snd_pcm_lib_period_bytes(substream),
 216                                         is_play ? DMA_MEM_TO_DEV : DMA_DEV_TO_MEM,
 217                                         DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
 218
 219        if (!desc) {
 220                dev_err(dev, "dmaengine_prep_slave_sg() fail\n");
 221                return -EIO;
 222        }
 223
 224        desc->callback          = rsnd_dmaen_complete;
 225        desc->callback_param    = rsnd_mod_get(dma);
 226
 227        dmaen->dma_len          = snd_pcm_lib_buffer_bytes(substream);
 228
 229        dmaen->cookie = dmaengine_submit(desc);
 230        if (dmaen->cookie < 0) {
 231                dev_err(dev, "dmaengine_submit() fail\n");
 232                return -EIO;
 233        }
 234
 235        dma_async_issue_pending(dmaen->chan);
 236
 237        return 0;
 238}
 239
 240struct dma_chan *rsnd_dma_request_channel(struct device_node *of_node, char *name,
 241                                          struct rsnd_mod *mod, char *x)
 242{
 243        struct dma_chan *chan = NULL;
 244        struct device_node *np;
 245        int i = 0;
 246
 247        for_each_child_of_node(of_node, np) {
 248                i = rsnd_node_fixed_index(np, name, i);
 249
 250                if (i == rsnd_mod_id_raw(mod) && (!chan))
 251                        chan = of_dma_request_slave_channel(np, x);
 252                i++;
 253        }
 254
 255        /* It should call of_node_put(), since, it is rsnd_xxx_of_node() */
 256        of_node_put(of_node);
 257
 258        return chan;
 259}
 260
 261static int rsnd_dmaen_attach(struct rsnd_dai_stream *io,
 262                           struct rsnd_dma *dma,
 263                           struct rsnd_mod *mod_from, struct rsnd_mod *mod_to)
 264{
 265        struct rsnd_priv *priv = rsnd_io_to_priv(io);
 266        struct rsnd_dma_ctrl *dmac = rsnd_priv_to_dmac(priv);
 267        struct dma_chan *chan;
 268
 269        /* try to get DMAEngine channel */
 270        chan = rsnd_dmaen_request_channel(io, mod_from, mod_to);
 271        if (IS_ERR_OR_NULL(chan)) {
 272                /* Let's follow when -EPROBE_DEFER case */
 273                if (PTR_ERR(chan) == -EPROBE_DEFER)
 274                        return PTR_ERR(chan);
 275
 276                /*
 277                 * DMA failed. try to PIO mode
 278                 * see
 279                 *      rsnd_ssi_fallback()
 280                 *      rsnd_rdai_continuance_probe()
 281                 */
 282                return -EAGAIN;
 283        }
 284
 285        /*
 286         * use it for IPMMU if needed
 287         * see
 288         *      rsnd_preallocate_pages()
 289         */
 290        io->dmac_dev = chan->device->dev;
 291
 292        dma_release_channel(chan);
 293
 294        dmac->dmaen_num++;
 295
 296        return 0;
 297}
 298
 299static int rsnd_dmaen_pointer(struct rsnd_mod *mod,
 300                              struct rsnd_dai_stream *io,
 301                              snd_pcm_uframes_t *pointer)
 302{
 303        struct snd_pcm_runtime *runtime = rsnd_io_to_runtime(io);
 304        struct rsnd_dma *dma = rsnd_mod_to_dma(mod);
 305        struct rsnd_dmaen *dmaen = rsnd_dma_to_dmaen(dma);
 306        struct dma_tx_state state;
 307        enum dma_status status;
 308        unsigned int pos = 0;
 309
 310        status = dmaengine_tx_status(dmaen->chan, dmaen->cookie, &state);
 311        if (status == DMA_IN_PROGRESS || status == DMA_PAUSED) {
 312                if (state.residue > 0 && state.residue <= dmaen->dma_len)
 313                        pos = dmaen->dma_len - state.residue;
 314        }
 315        *pointer = bytes_to_frames(runtime, pos);
 316
 317        return 0;
 318}
 319
 320static struct rsnd_mod_ops rsnd_dmaen_ops = {
 321        .name           = "audmac",
 322        .prepare        = rsnd_dmaen_prepare,
 323        .cleanup        = rsnd_dmaen_cleanup,
 324        .start          = rsnd_dmaen_start,
 325        .stop           = rsnd_dmaen_stop,
 326        .pointer        = rsnd_dmaen_pointer,
 327        .get_status     = rsnd_mod_get_status,
 328};
 329
 330/*
 331 *              Audio DMAC peri peri
 332 */
 333static const u8 gen2_id_table_ssiu[] = {
 334        /* SSI00 ~ SSI07 */
 335        0x00, 0x01, 0x02, 0x03, 0x39, 0x3a, 0x3b, 0x3c,
 336        /* SSI10 ~ SSI17 */
 337        0x04, 0x05, 0x06, 0x07, 0x3d, 0x3e, 0x3f, 0x40,
 338        /* SSI20 ~ SSI27 */
 339        0x08, 0x09, 0x0a, 0x0b, 0x41, 0x42, 0x43, 0x44,
 340        /* SSI30 ~ SSI37 */
 341        0x0c, 0x45, 0x46, 0x47, 0x48, 0x49, 0x4a, 0x4b,
 342        /* SSI40 ~ SSI47 */
 343        0x0d, 0x4c, 0x4d, 0x4e, 0x4f, 0x50, 0x51, 0x52,
 344        /* SSI5 */
 345        0x0e, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 346        /* SSI6 */
 347        0x0f, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 348        /* SSI7 */
 349        0x10, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 350        /* SSI8 */
 351        0x11, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 352        /* SSI90 ~ SSI97 */
 353        0x12, 0x13, 0x14, 0x15, 0x53, 0x54, 0x55, 0x56,
 354};
 355static const u8 gen2_id_table_scu[] = {
 356        0x2d, /* SCU_SRCI0 */
 357        0x2e, /* SCU_SRCI1 */
 358        0x2f, /* SCU_SRCI2 */
 359        0x30, /* SCU_SRCI3 */
 360        0x31, /* SCU_SRCI4 */
 361        0x32, /* SCU_SRCI5 */
 362        0x33, /* SCU_SRCI6 */
 363        0x34, /* SCU_SRCI7 */
 364        0x35, /* SCU_SRCI8 */
 365        0x36, /* SCU_SRCI9 */
 366};
 367static const u8 gen2_id_table_cmd[] = {
 368        0x37, /* SCU_CMD0 */
 369        0x38, /* SCU_CMD1 */
 370};
 371
 372static u32 rsnd_dmapp_get_id(struct rsnd_dai_stream *io,
 373                             struct rsnd_mod *mod)
 374{
 375        struct rsnd_mod *ssi = rsnd_io_to_mod_ssi(io);
 376        struct rsnd_mod *ssiu = rsnd_io_to_mod_ssiu(io);
 377        struct rsnd_mod *src = rsnd_io_to_mod_src(io);
 378        struct rsnd_mod *dvc = rsnd_io_to_mod_dvc(io);
 379        const u8 *entry = NULL;
 380        int id = 255;
 381        int size = 0;
 382
 383        if ((mod == ssi) ||
 384            (mod == ssiu)) {
 385                int busif = rsnd_mod_id_sub(ssiu);
 386
 387                entry = gen2_id_table_ssiu;
 388                size = ARRAY_SIZE(gen2_id_table_ssiu);
 389                id = (rsnd_mod_id(mod) * 8) + busif;
 390        } else if (mod == src) {
 391                entry = gen2_id_table_scu;
 392                size = ARRAY_SIZE(gen2_id_table_scu);
 393                id = rsnd_mod_id(mod);
 394        } else if (mod == dvc) {
 395                entry = gen2_id_table_cmd;
 396                size = ARRAY_SIZE(gen2_id_table_cmd);
 397                id = rsnd_mod_id(mod);
 398        }
 399
 400        if ((!entry) || (size <= id)) {
 401                struct device *dev = rsnd_priv_to_dev(rsnd_io_to_priv(io));
 402
 403                dev_err(dev, "unknown connection (%s)\n", rsnd_mod_name(mod));
 404
 405                /* use non-prohibited SRS number as error */
 406                return 0x00; /* SSI00 */
 407        }
 408
 409        return entry[id];
 410}
 411
 412static u32 rsnd_dmapp_get_chcr(struct rsnd_dai_stream *io,
 413                               struct rsnd_mod *mod_from,
 414                               struct rsnd_mod *mod_to)
 415{
 416        return  (rsnd_dmapp_get_id(io, mod_from) << 24) +
 417                (rsnd_dmapp_get_id(io, mod_to) << 16);
 418}
 419
 420#define rsnd_dmapp_addr(dmac, dma, reg) \
 421        (dmac->ppbase + 0x20 + reg + \
 422         (0x10 * rsnd_dma_to_dmapp(dma)->dmapp_id))
 423static void rsnd_dmapp_write(struct rsnd_dma *dma, u32 data, u32 reg)
 424{
 425        struct rsnd_mod *mod = rsnd_mod_get(dma);
 426        struct rsnd_priv *priv = rsnd_mod_to_priv(mod);
 427        struct rsnd_dma_ctrl *dmac = rsnd_priv_to_dmac(priv);
 428        struct device *dev = rsnd_priv_to_dev(priv);
 429
 430        dev_dbg(dev, "w 0x%px : %08x\n", rsnd_dmapp_addr(dmac, dma, reg), data);
 431
 432        iowrite32(data, rsnd_dmapp_addr(dmac, dma, reg));
 433}
 434
 435static u32 rsnd_dmapp_read(struct rsnd_dma *dma, u32 reg)
 436{
 437        struct rsnd_mod *mod = rsnd_mod_get(dma);
 438        struct rsnd_priv *priv = rsnd_mod_to_priv(mod);
 439        struct rsnd_dma_ctrl *dmac = rsnd_priv_to_dmac(priv);
 440
 441        return ioread32(rsnd_dmapp_addr(dmac, dma, reg));
 442}
 443
 444static void rsnd_dmapp_bset(struct rsnd_dma *dma, u32 data, u32 mask, u32 reg)
 445{
 446        struct rsnd_mod *mod = rsnd_mod_get(dma);
 447        struct rsnd_priv *priv = rsnd_mod_to_priv(mod);
 448        struct rsnd_dma_ctrl *dmac = rsnd_priv_to_dmac(priv);
 449        void __iomem *addr = rsnd_dmapp_addr(dmac, dma, reg);
 450        u32 val = ioread32(addr);
 451
 452        val &= ~mask;
 453        val |= (data & mask);
 454
 455        iowrite32(val, addr);
 456}
 457
 458static int rsnd_dmapp_stop(struct rsnd_mod *mod,
 459                           struct rsnd_dai_stream *io,
 460                           struct rsnd_priv *priv)
 461{
 462        struct rsnd_dma *dma = rsnd_mod_to_dma(mod);
 463        int i;
 464
 465        rsnd_dmapp_bset(dma, 0,  PDMACHCR_DE, PDMACHCR);
 466
 467        for (i = 0; i < 1024; i++) {
 468                if (0 == (rsnd_dmapp_read(dma, PDMACHCR) & PDMACHCR_DE))
 469                        return 0;
 470                udelay(1);
 471        }
 472
 473        return -EIO;
 474}
 475
 476static int rsnd_dmapp_start(struct rsnd_mod *mod,
 477                            struct rsnd_dai_stream *io,
 478                            struct rsnd_priv *priv)
 479{
 480        struct rsnd_dma *dma = rsnd_mod_to_dma(mod);
 481        struct rsnd_dmapp *dmapp = rsnd_dma_to_dmapp(dma);
 482
 483        rsnd_dmapp_write(dma, dma->src_addr,    PDMASAR);
 484        rsnd_dmapp_write(dma, dma->dst_addr,    PDMADAR);
 485        rsnd_dmapp_write(dma, dmapp->chcr,      PDMACHCR);
 486
 487        return 0;
 488}
 489
 490static int rsnd_dmapp_attach(struct rsnd_dai_stream *io,
 491                             struct rsnd_dma *dma,
 492                             struct rsnd_mod *mod_from, struct rsnd_mod *mod_to)
 493{
 494        struct rsnd_dmapp *dmapp = rsnd_dma_to_dmapp(dma);
 495        struct rsnd_priv *priv = rsnd_io_to_priv(io);
 496        struct rsnd_dma_ctrl *dmac = rsnd_priv_to_dmac(priv);
 497        struct device *dev = rsnd_priv_to_dev(priv);
 498
 499        dmapp->dmapp_id = dmac->dmapp_num;
 500        dmapp->chcr = rsnd_dmapp_get_chcr(io, mod_from, mod_to) | PDMACHCR_DE;
 501
 502        dmac->dmapp_num++;
 503
 504        dev_dbg(dev, "id/src/dst/chcr = %d/%pad/%pad/%08x\n",
 505                dmapp->dmapp_id, &dma->src_addr, &dma->dst_addr, dmapp->chcr);
 506
 507        return 0;
 508}
 509
 510#ifdef CONFIG_DEBUG_FS
 511static void rsnd_dmapp_debug_info(struct seq_file *m,
 512                                  struct rsnd_dai_stream *io,
 513                                  struct rsnd_mod *mod)
 514{
 515        struct rsnd_priv *priv = rsnd_mod_to_priv(mod);
 516        struct rsnd_dma_ctrl *dmac = rsnd_priv_to_dmac(priv);
 517        struct rsnd_dma *dma = rsnd_mod_to_dma(mod);
 518        struct rsnd_dmapp *dmapp = rsnd_dma_to_dmapp(dma);
 519
 520        rsnd_debugfs_reg_show(m, dmac->ppres, dmac->ppbase,
 521                              0x20 + 0x10 * dmapp->dmapp_id, 0x10);
 522}
 523#define DEBUG_INFO .debug_info = rsnd_dmapp_debug_info
 524#else
 525#define DEBUG_INFO
 526#endif
 527
 528static struct rsnd_mod_ops rsnd_dmapp_ops = {
 529        .name           = "audmac-pp",
 530        .start          = rsnd_dmapp_start,
 531        .stop           = rsnd_dmapp_stop,
 532        .quit           = rsnd_dmapp_stop,
 533        .get_status     = rsnd_mod_get_status,
 534        DEBUG_INFO
 535};
 536
 537/*
 538 *              Common DMAC Interface
 539 */
 540
 541/*
 542 *      DMA read/write register offset
 543 *
 544 *      RSND_xxx_I_N    for Audio DMAC input
 545 *      RSND_xxx_O_N    for Audio DMAC output
 546 *      RSND_xxx_I_P    for Audio DMAC peri peri input
 547 *      RSND_xxx_O_P    for Audio DMAC peri peri output
 548 *
 549 *      ex) R-Car H2 case
 550 *            mod        / DMAC in    / DMAC out   / DMAC PP in / DMAC pp out
 551 *      SSI : 0xec541000 / 0xec241008 / 0xec24100c
 552 *      SSIU: 0xec541000 / 0xec100000 / 0xec100000 / 0xec400000 / 0xec400000
 553 *      SCU : 0xec500000 / 0xec000000 / 0xec004000 / 0xec300000 / 0xec304000
 554 *      CMD : 0xec500000 /            / 0xec008000                0xec308000
 555 */
 556#define RDMA_SSI_I_N(addr, i)   (addr ##_reg - 0x00300000 + (0x40 * i) + 0x8)
 557#define RDMA_SSI_O_N(addr, i)   (addr ##_reg - 0x00300000 + (0x40 * i) + 0xc)
 558
 559#define RDMA_SSIU_I_N(addr, i, j) (addr ##_reg - 0x00441000 + (0x1000 * (i)) + (((j) / 4) * 0xA000) + (((j) % 4) * 0x400) - (0x4000 * ((i) / 9) * ((j) / 4)))
 560#define RDMA_SSIU_O_N(addr, i, j) RDMA_SSIU_I_N(addr, i, j)
 561
 562#define RDMA_SSIU_I_P(addr, i, j) (addr ##_reg - 0x00141000 + (0x1000 * (i)) + (((j) / 4) * 0xA000) + (((j) % 4) * 0x400) - (0x4000 * ((i) / 9) * ((j) / 4)))
 563#define RDMA_SSIU_O_P(addr, i, j) RDMA_SSIU_I_P(addr, i, j)
 564
 565#define RDMA_SRC_I_N(addr, i)   (addr ##_reg - 0x00500000 + (0x400 * i))
 566#define RDMA_SRC_O_N(addr, i)   (addr ##_reg - 0x004fc000 + (0x400 * i))
 567
 568#define RDMA_SRC_I_P(addr, i)   (addr ##_reg - 0x00200000 + (0x400 * i))
 569#define RDMA_SRC_O_P(addr, i)   (addr ##_reg - 0x001fc000 + (0x400 * i))
 570
 571#define RDMA_CMD_O_N(addr, i)   (addr ##_reg - 0x004f8000 + (0x400 * i))
 572#define RDMA_CMD_O_P(addr, i)   (addr ##_reg - 0x001f8000 + (0x400 * i))
 573
 574static dma_addr_t
 575rsnd_gen2_dma_addr(struct rsnd_dai_stream *io,
 576                   struct rsnd_mod *mod,
 577                   int is_play, int is_from)
 578{
 579        struct rsnd_priv *priv = rsnd_io_to_priv(io);
 580        struct device *dev = rsnd_priv_to_dev(priv);
 581        phys_addr_t ssi_reg = rsnd_gen_get_phy_addr(priv, RSND_GEN2_SSI);
 582        phys_addr_t src_reg = rsnd_gen_get_phy_addr(priv, RSND_GEN2_SCU);
 583        int is_ssi = !!(rsnd_io_to_mod_ssi(io) == mod) ||
 584                     !!(rsnd_io_to_mod_ssiu(io) == mod);
 585        int use_src = !!rsnd_io_to_mod_src(io);
 586        int use_cmd = !!rsnd_io_to_mod_dvc(io) ||
 587                      !!rsnd_io_to_mod_mix(io) ||
 588                      !!rsnd_io_to_mod_ctu(io);
 589        int id = rsnd_mod_id(mod);
 590        int busif = rsnd_mod_id_sub(rsnd_io_to_mod_ssiu(io));
 591        struct dma_addr {
 592                dma_addr_t out_addr;
 593                dma_addr_t in_addr;
 594        } dma_addrs[3][2][3] = {
 595                /* SRC */
 596                /* Capture */
 597                {{{ 0,                          0 },
 598                  { RDMA_SRC_O_N(src, id),      RDMA_SRC_I_P(src, id) },
 599                  { RDMA_CMD_O_N(src, id),      RDMA_SRC_I_P(src, id) } },
 600                 /* Playback */
 601                 {{ 0,                          0, },
 602                  { RDMA_SRC_O_P(src, id),      RDMA_SRC_I_N(src, id) },
 603                  { RDMA_CMD_O_P(src, id),      RDMA_SRC_I_N(src, id) } }
 604                },
 605                /* SSI */
 606                /* Capture */
 607                {{{ RDMA_SSI_O_N(ssi, id),              0 },
 608                  { RDMA_SSIU_O_P(ssi, id, busif),      0 },
 609                  { RDMA_SSIU_O_P(ssi, id, busif),      0 } },
 610                 /* Playback */
 611                 {{ 0,                  RDMA_SSI_I_N(ssi, id) },
 612                  { 0,                  RDMA_SSIU_I_P(ssi, id, busif) },
 613                  { 0,                  RDMA_SSIU_I_P(ssi, id, busif) } }
 614                },
 615                /* SSIU */
 616                /* Capture */
 617                {{{ RDMA_SSIU_O_N(ssi, id, busif),      0 },
 618                  { RDMA_SSIU_O_P(ssi, id, busif),      0 },
 619                  { RDMA_SSIU_O_P(ssi, id, busif),      0 } },
 620                 /* Playback */
 621                 {{ 0,                  RDMA_SSIU_I_N(ssi, id, busif) },
 622                  { 0,                  RDMA_SSIU_I_P(ssi, id, busif) },
 623                  { 0,                  RDMA_SSIU_I_P(ssi, id, busif) } } },
 624        };
 625
 626        /*
 627         * FIXME
 628         *
 629         * We can't support SSI9-4/5/6/7, because its address is
 630         * out of calculation rule
 631         */
 632        if ((id == 9) && (busif >= 4))
 633                dev_err(dev, "This driver doesn't support SSI%d-%d, so far",
 634                        id, busif);
 635
 636        /* it shouldn't happen */
 637        if (use_cmd && !use_src)
 638                dev_err(dev, "DVC is selected without SRC\n");
 639
 640        /* use SSIU or SSI ? */
 641        if (is_ssi && rsnd_ssi_use_busif(io))
 642                is_ssi++;
 643
 644        return (is_from) ?
 645                dma_addrs[is_ssi][is_play][use_src + use_cmd].out_addr :
 646                dma_addrs[is_ssi][is_play][use_src + use_cmd].in_addr;
 647}
 648
 649static dma_addr_t rsnd_dma_addr(struct rsnd_dai_stream *io,
 650                                struct rsnd_mod *mod,
 651                                int is_play, int is_from)
 652{
 653        struct rsnd_priv *priv = rsnd_io_to_priv(io);
 654
 655        /*
 656         * gen1 uses default DMA addr
 657         */
 658        if (rsnd_is_gen1(priv))
 659                return 0;
 660
 661        if (!mod)
 662                return 0;
 663
 664        return rsnd_gen2_dma_addr(io, mod, is_play, is_from);
 665}
 666
 667#define MOD_MAX (RSND_MOD_MAX + 1) /* +Memory */
 668static void rsnd_dma_of_path(struct rsnd_mod *this,
 669                             struct rsnd_dai_stream *io,
 670                             int is_play,
 671                             struct rsnd_mod **mod_from,
 672                             struct rsnd_mod **mod_to)
 673{
 674        struct rsnd_mod *ssi;
 675        struct rsnd_mod *src = rsnd_io_to_mod_src(io);
 676        struct rsnd_mod *ctu = rsnd_io_to_mod_ctu(io);
 677        struct rsnd_mod *mix = rsnd_io_to_mod_mix(io);
 678        struct rsnd_mod *dvc = rsnd_io_to_mod_dvc(io);
 679        struct rsnd_mod *mod[MOD_MAX];
 680        struct rsnd_mod *mod_start, *mod_end;
 681        struct rsnd_priv *priv = rsnd_mod_to_priv(this);
 682        struct device *dev = rsnd_priv_to_dev(priv);
 683        int nr, i, idx;
 684
 685        /*
 686         * It should use "rcar_sound,ssiu" on DT.
 687         * But, we need to keep compatibility for old version.
 688         *
 689         * If it has "rcar_sound.ssiu", it will be used.
 690         * If not, "rcar_sound.ssi" will be used.
 691         * see
 692         *      rsnd_ssiu_dma_req()
 693         *      rsnd_ssi_dma_req()
 694         */
 695        if (rsnd_ssiu_of_node(priv)) {
 696                struct rsnd_mod *ssiu = rsnd_io_to_mod_ssiu(io);
 697
 698                /* use SSIU */
 699                ssi = ssiu;
 700                if (this == rsnd_io_to_mod_ssi(io))
 701                        this = ssiu;
 702        } else {
 703                /* keep compatible, use SSI */
 704                ssi = rsnd_io_to_mod_ssi(io);
 705        }
 706
 707        if (!ssi)
 708                return;
 709
 710        nr = 0;
 711        for (i = 0; i < MOD_MAX; i++) {
 712                mod[i] = NULL;
 713                nr += !!rsnd_io_to_mod(io, i);
 714        }
 715
 716        /*
 717         * [S] -*-> [E]
 718         * [S] -*-> SRC -o-> [E]
 719         * [S] -*-> SRC -> DVC -o-> [E]
 720         * [S] -*-> SRC -> CTU -> MIX -> DVC -o-> [E]
 721         *
 722         * playback     [S] = mem
 723         *              [E] = SSI
 724         *
 725         * capture      [S] = SSI
 726         *              [E] = mem
 727         *
 728         * -*->         Audio DMAC
 729         * -o->         Audio DMAC peri peri
 730         */
 731        mod_start       = (is_play) ? NULL : ssi;
 732        mod_end         = (is_play) ? ssi  : NULL;
 733
 734        idx = 0;
 735        mod[idx++] = mod_start;
 736        for (i = 1; i < nr; i++) {
 737                if (src) {
 738                        mod[idx++] = src;
 739                        src = NULL;
 740                } else if (ctu) {
 741                        mod[idx++] = ctu;
 742                        ctu = NULL;
 743                } else if (mix) {
 744                        mod[idx++] = mix;
 745                        mix = NULL;
 746                } else if (dvc) {
 747                        mod[idx++] = dvc;
 748                        dvc = NULL;
 749                }
 750        }
 751        mod[idx] = mod_end;
 752
 753        /*
 754         *              | SSI | SRC |
 755         * -------------+-----+-----+
 756         *  is_play     |  o  |  *  |
 757         * !is_play     |  *  |  o  |
 758         */
 759        if ((this == ssi) == (is_play)) {
 760                *mod_from       = mod[idx - 1];
 761                *mod_to         = mod[idx];
 762        } else {
 763                *mod_from       = mod[0];
 764                *mod_to         = mod[1];
 765        }
 766
 767        dev_dbg(dev, "module connection (this is %s)\n", rsnd_mod_name(this));
 768        for (i = 0; i <= idx; i++) {
 769                dev_dbg(dev, "  %s%s\n",
 770                        rsnd_mod_name(mod[i] ? mod[i] : &mem),
 771                        (mod[i] == *mod_from) ? " from" :
 772                        (mod[i] == *mod_to)   ? " to" : "");
 773        }
 774}
 775
 776static int rsnd_dma_alloc(struct rsnd_dai_stream *io, struct rsnd_mod *mod,
 777                          struct rsnd_mod **dma_mod)
 778{
 779        struct rsnd_mod *mod_from = NULL;
 780        struct rsnd_mod *mod_to = NULL;
 781        struct rsnd_priv *priv = rsnd_io_to_priv(io);
 782        struct rsnd_dma_ctrl *dmac = rsnd_priv_to_dmac(priv);
 783        struct device *dev = rsnd_priv_to_dev(priv);
 784        struct rsnd_dma *dma;
 785        struct rsnd_mod_ops *ops;
 786        enum rsnd_mod_type type;
 787        int (*attach)(struct rsnd_dai_stream *io, struct rsnd_dma *dma,
 788                      struct rsnd_mod *mod_from, struct rsnd_mod *mod_to);
 789        int is_play = rsnd_io_is_play(io);
 790        int ret, dma_id;
 791
 792        /*
 793         * DMA failed. try to PIO mode
 794         * see
 795         *      rsnd_ssi_fallback()
 796         *      rsnd_rdai_continuance_probe()
 797         */
 798        if (!dmac)
 799                return -EAGAIN;
 800
 801        rsnd_dma_of_path(mod, io, is_play, &mod_from, &mod_to);
 802
 803        /* for Gen2 or later */
 804        if (mod_from && mod_to) {
 805                ops     = &rsnd_dmapp_ops;
 806                attach  = rsnd_dmapp_attach;
 807                dma_id  = dmac->dmapp_num;
 808                type    = RSND_MOD_AUDMAPP;
 809        } else {
 810                ops     = &rsnd_dmaen_ops;
 811                attach  = rsnd_dmaen_attach;
 812                dma_id  = dmac->dmaen_num;
 813                type    = RSND_MOD_AUDMA;
 814        }
 815
 816        /* for Gen1, overwrite */
 817        if (rsnd_is_gen1(priv)) {
 818                ops     = &rsnd_dmaen_ops;
 819                attach  = rsnd_dmaen_attach;
 820                dma_id  = dmac->dmaen_num;
 821                type    = RSND_MOD_AUDMA;
 822        }
 823
 824        dma = devm_kzalloc(dev, sizeof(*dma), GFP_KERNEL);
 825        if (!dma)
 826                return -ENOMEM;
 827
 828        *dma_mod = rsnd_mod_get(dma);
 829
 830        ret = rsnd_mod_init(priv, *dma_mod, ops, NULL,
 831                            type, dma_id);
 832        if (ret < 0)
 833                return ret;
 834
 835        dev_dbg(dev, "%s %s -> %s\n",
 836                rsnd_mod_name(*dma_mod),
 837                rsnd_mod_name(mod_from ? mod_from : &mem),
 838                rsnd_mod_name(mod_to   ? mod_to   : &mem));
 839
 840        ret = attach(io, dma, mod_from, mod_to);
 841        if (ret < 0)
 842                return ret;
 843
 844        dma->src_addr = rsnd_dma_addr(io, mod_from, is_play, 1);
 845        dma->dst_addr = rsnd_dma_addr(io, mod_to,   is_play, 0);
 846        dma->mod_from = mod_from;
 847        dma->mod_to   = mod_to;
 848
 849        return 0;
 850}
 851
 852int rsnd_dma_attach(struct rsnd_dai_stream *io, struct rsnd_mod *mod,
 853                    struct rsnd_mod **dma_mod)
 854{
 855        if (!(*dma_mod)) {
 856                int ret = rsnd_dma_alloc(io, mod, dma_mod);
 857
 858                if (ret < 0)
 859                        return ret;
 860        }
 861
 862        return rsnd_dai_connect(*dma_mod, io, (*dma_mod)->type);
 863}
 864
 865int rsnd_dma_probe(struct rsnd_priv *priv)
 866{
 867        struct platform_device *pdev = rsnd_priv_to_pdev(priv);
 868        struct device *dev = rsnd_priv_to_dev(priv);
 869        struct rsnd_dma_ctrl *dmac;
 870        struct resource *res;
 871
 872        /*
 873         * for Gen1
 874         */
 875        if (rsnd_is_gen1(priv))
 876                return 0;
 877
 878        /*
 879         * for Gen2 or later
 880         */
 881        res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "audmapp");
 882        dmac = devm_kzalloc(dev, sizeof(*dmac), GFP_KERNEL);
 883        if (!dmac || !res) {
 884                dev_err(dev, "dma allocate failed\n");
 885                return 0; /* it will be PIO mode */
 886        }
 887
 888        dmac->dmapp_num = 0;
 889        dmac->ppres  = res->start;
 890        dmac->ppbase = devm_ioremap_resource(dev, res);
 891        if (IS_ERR(dmac->ppbase))
 892                return PTR_ERR(dmac->ppbase);
 893
 894        priv->dma = dmac;
 895
 896        /* dummy mem mod for debug */
 897        return rsnd_mod_init(NULL, &mem, &mem_ops, NULL, 0, 0);
 898}
 899