drivers/mailbox/tegra-hsp.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (c) 2016-2023, NVIDIA CORPORATION.  All rights reserved.
   4  */
   5
   6 #include <linux/delay.h>
   7 #include <linux/interrupt.h>
   8 #include <linux/io.h>
   9 #include <linux/mailbox_controller.h>
  10 #include <linux/of.h>
  11 #include <linux/platform_device.h>
  12 #include <linux/pm.h>
  13 #include <linux/slab.h>
  14
  15 #include <soc/tegra/fuse.h>
  16
  17 #include <dt-bindings/mailbox/tegra186-hsp.h>
  18
  19 #include "mailbox.h"
  20
  21 #define HSP_INT_IE(x)           (0x100 + ((x) * 4))
  22 #define HSP_INT_IV              0x300
  23 #define HSP_INT_IR              0x304
  24
  25 #define HSP_INT_EMPTY_SHIFT     0
  26 #define HSP_INT_EMPTY_MASK      0xff
  27 #define HSP_INT_FULL_SHIFT      8
  28 #define HSP_INT_FULL_MASK       0xff
  29
  30 #define HSP_INT_DIMENSIONING    0x380
  31 #define HSP_nSM_SHIFT           0
  32 #define HSP_nSS_SHIFT           4
  33 #define HSP_nAS_SHIFT           8
  34 #define HSP_nDB_SHIFT           12
  35 #define HSP_nSI_SHIFT           16
  36 #define HSP_nINT_MASK           0xf
  37
  38 #define HSP_DB_TRIGGER  0x0
  39 #define HSP_DB_ENABLE   0x4
  40 #define HSP_DB_RAW      0x8
  41 #define HSP_DB_PENDING  0xc
  42
  43 #define HSP_SM_SHRD_MBOX        0x0
  44 #define HSP_SM_SHRD_MBOX_FULL   BIT(31)
  45 #define HSP_SM_SHRD_MBOX_FULL_INT_IE    0x04
  46 #define HSP_SM_SHRD_MBOX_EMPTY_INT_IE   0x08
  47
  48 #define HSP_SHRD_MBOX_TYPE1_TAG         0x40
  49 #define HSP_SHRD_MBOX_TYPE1_DATA0       0x48
  50 #define HSP_SHRD_MBOX_TYPE1_DATA1       0x4c
  51 #define HSP_SHRD_MBOX_TYPE1_DATA2       0x50
  52 #define HSP_SHRD_MBOX_TYPE1_DATA3       0x54
  53
  54 #define HSP_DB_CCPLEX           1
  55 #define HSP_DB_BPMP             3
  56 #define HSP_DB_MAX              7
  57
  58 #define HSP_MBOX_TYPE_MASK      0xff
  59
  60 struct tegra_hsp_channel;
  61 struct tegra_hsp;
  62
  63 struct tegra_hsp_channel {
  64         struct tegra_hsp *hsp;
  65         struct mbox_chan *chan;
  66         void __iomem *regs;
  67 };
  68
  69 struct tegra_hsp_doorbell {
  70         struct tegra_hsp_channel channel;
  71         struct list_head list;
  72         const char *name;
  73         unsigned int master;
  74         unsigned int index;
  75 };
  76
  77 struct tegra_hsp_sm_ops {
  78         void (*send)(struct tegra_hsp_channel *channel, void *data);
  79         void (*recv)(struct tegra_hsp_channel *channel);
  80 };
  81
  82 struct tegra_hsp_mailbox {
  83         struct tegra_hsp_channel channel;
  84         const struct tegra_hsp_sm_ops *ops;
  85         unsigned int index;
  86         bool producer;
  87 };
  88
  89 struct tegra_hsp_db_map {
  90         const char *name;
  91         unsigned int master;
  92         unsigned int index;
  93 };
  94
  95 struct tegra_hsp_soc {
  96         const struct tegra_hsp_db_map *map;
  97         bool has_per_mb_ie;
  98         bool has_128_bit_mb;
  99         unsigned int reg_stride;
 100 };
 101
 102 struct tegra_hsp {
 103         struct device *dev;
 104         const struct tegra_hsp_soc *soc;
 105         struct mbox_controller mbox_db;
 106         struct mbox_controller mbox_sm;
 107         void __iomem *regs;
 108         unsigned int doorbell_irq;
 109         unsigned int *shared_irqs;
 110         unsigned int shared_irq;
 111         unsigned int num_sm;
 112         unsigned int num_as;
 113         unsigned int num_ss;
 114         unsigned int num_db;
 115         unsigned int num_si;
 116
 117         spinlock_t lock;
 118         struct lock_class_key lock_key;
 119
 120         struct list_head doorbells;
 121         struct tegra_hsp_mailbox *mailboxes;
 122
 123         unsigned long mask;
 124 };
 125
 126 static inline u32 tegra_hsp_readl(struct tegra_hsp *hsp, unsigned int offset)
 127 {
 128         return readl(hsp->regs + offset);
 129 }
 130
 131 static inline void tegra_hsp_writel(struct tegra_hsp *hsp, u32 value,
 132                                     unsigned int offset)
 133 {
 134         writel(value, hsp->regs + offset);
 135 }
 136
 137 static inline u32 tegra_hsp_channel_readl(struct tegra_hsp_channel *channel,
 138                                           unsigned int offset)
 139 {
 140         return readl(channel->regs + offset);
 141 }
 142
 143 static inline void tegra_hsp_channel_writel(struct tegra_hsp_channel *channel,
 144                                             u32 value, unsigned int offset)
 145 {
 146         writel(value, channel->regs + offset);
 147 }
 148
 149 static bool tegra_hsp_doorbell_can_ring(struct tegra_hsp_doorbell *db)
 150 {
 151         u32 value;
 152
 153         value = tegra_hsp_channel_readl(&db->channel, HSP_DB_ENABLE);
 154
 155         return (value & BIT(TEGRA_HSP_DB_MASTER_CCPLEX)) != 0;
 156 }
 157
 158 static struct tegra_hsp_doorbell *
 159 __tegra_hsp_doorbell_get(struct tegra_hsp *hsp, unsigned int master)
 160 {
 161         struct tegra_hsp_doorbell *entry;
 162
 163         list_for_each_entry(entry, &hsp->doorbells, list)
 164                 if (entry->master == master)
 165                         return entry;
 166
 167         return NULL;
 168 }
 169
 170 static struct tegra_hsp_doorbell *
 171 tegra_hsp_doorbell_get(struct tegra_hsp *hsp, unsigned int master)
 172 {
 173         struct tegra_hsp_doorbell *db;
 174         unsigned long flags;
 175
 176         spin_lock_irqsave(&hsp->lock, flags);
 177         db = __tegra_hsp_doorbell_get(hsp, master);
 178         spin_unlock_irqrestore(&hsp->lock, flags);
 179
 180         return db;
 181 }
 182
 183 static irqreturn_t tegra_hsp_doorbell_irq(int irq, void *data)
 184 {
 185         struct tegra_hsp *hsp = data;
 186         struct tegra_hsp_doorbell *db;
 187         unsigned long master, value;
 188
 189         db = tegra_hsp_doorbell_get(hsp, TEGRA_HSP_DB_MASTER_CCPLEX);
 190         if (!db)
 191                 return IRQ_NONE;
 192
 193         value = tegra_hsp_channel_readl(&db->channel, HSP_DB_PENDING);
 194         tegra_hsp_channel_writel(&db->channel, value, HSP_DB_PENDING);
 195
 196         spin_lock(&hsp->lock);
 197
 198         for_each_set_bit(master, &value, hsp->mbox_db.num_chans) {
 199                 struct tegra_hsp_doorbell *db;
 200
 201                 db = __tegra_hsp_doorbell_get(hsp, master);
 202                 /*
 203                  * Depending on the bootloader chain, the CCPLEX doorbell will
 204                  * have some doorbells enabled, which means that requesting an
 205                  * interrupt will immediately fire.
 206                  *
 207                  * In that case, db->channel.chan will still be NULL here and
 208                  * cause a crash if not properly guarded.
 209                  *
 210                  * It remains to be seen if ignoring the doorbell in that case
 211                  * is the correct solution.
 212                  */
 213                 if (db && db->channel.chan)
 214                         mbox_chan_received_data(db->channel.chan, NULL);
 215         }
 216
 217         spin_unlock(&hsp->lock);
 218
 219         return IRQ_HANDLED;
 220 }
 221
 222 static irqreturn_t tegra_hsp_shared_irq(int irq, void *data)
 223 {
 224         struct tegra_hsp *hsp = data;
 225         unsigned long bit, mask;
 226         u32 status;
 227
 228         status = tegra_hsp_readl(hsp, HSP_INT_IR) & hsp->mask;
 229
 230         /* process EMPTY interrupts first */
 231         mask = (status >> HSP_INT_EMPTY_SHIFT) & HSP_INT_EMPTY_MASK;
 232
 233         for_each_set_bit(bit, &mask, hsp->num_sm) {
 234                 struct tegra_hsp_mailbox *mb = &hsp->mailboxes[bit];
 235
 236                 if (mb->producer) {
 237                         /*
 238                          * Disable EMPTY interrupts until data is sent with
 239                          * the next message. These interrupts are level-
 240                          * triggered, so if we kept them enabled they would
 241                          * constantly trigger until we next write data into
 242                          * the message.
 243                          */
 244                         spin_lock(&hsp->lock);
 245
 246                         hsp->mask &= ~BIT(HSP_INT_EMPTY_SHIFT + mb->index);
 247                         tegra_hsp_writel(hsp, hsp->mask,
 248                                          HSP_INT_IE(hsp->shared_irq));
 249
 250                         spin_unlock(&hsp->lock);
 251
 252                         mbox_chan_txdone(mb->channel.chan, 0);
 253                 }
 254         }
 255
 256         /* process FULL interrupts */
 257         mask = (status >> HSP_INT_FULL_SHIFT) & HSP_INT_FULL_MASK;
 258
 259         for_each_set_bit(bit, &mask, hsp->num_sm) {
 260                 struct tegra_hsp_mailbox *mb = &hsp->mailboxes[bit];
 261
 262                 if (!mb->producer)
 263                         mb->ops->recv(&mb->channel);
 264         }
 265
 266         return IRQ_HANDLED;
 267 }
 268
 269 static struct tegra_hsp_channel *
 270 tegra_hsp_doorbell_create(struct tegra_hsp *hsp, const char *name,
 271                           unsigned int master, unsigned int index)
 272 {
 273         struct tegra_hsp_doorbell *db;
 274         unsigned int offset;
 275         unsigned long flags;
 276
 277         db = devm_kzalloc(hsp->dev, sizeof(*db), GFP_KERNEL);
 278         if (!db)
 279                 return ERR_PTR(-ENOMEM);
 280
 281         offset = (1 + (hsp->num_sm / 2) + hsp->num_ss + hsp->num_as) * SZ_64K;
 282         offset += index * hsp->soc->reg_stride;
 283
 284         db->channel.regs = hsp->regs + offset;
 285         db->channel.hsp = hsp;
 286
 287         db->name = devm_kstrdup_const(hsp->dev, name, GFP_KERNEL);
 288         db->master = master;
 289         db->index = index;
 290
 291         spin_lock_irqsave(&hsp->lock, flags);
 292         list_add_tail(&db->list, &hsp->doorbells);
 293         spin_unlock_irqrestore(&hsp->lock, flags);
 294
 295         return &db->channel;
 296 }
 297
 298 static int tegra_hsp_doorbell_send_data(struct mbox_chan *chan, void *data)
 299 {
 300         struct tegra_hsp_doorbell *db = chan->con_priv;
 301
 302         tegra_hsp_channel_writel(&db->channel, 1, HSP_DB_TRIGGER);
 303
 304         return 0;
 305 }
 306
 307 static int tegra_hsp_doorbell_startup(struct mbox_chan *chan)
 308 {
 309         struct tegra_hsp_doorbell *db = chan->con_priv;
 310         struct tegra_hsp *hsp = db->channel.hsp;
 311         struct tegra_hsp_doorbell *ccplex;
 312         unsigned long flags;
 313         u32 value;
 314
 315         if (db->master >= chan->mbox->num_chans) {
 316                 dev_err(chan->mbox->dev,
 317                         "invalid master ID %u for HSP channel\n",
 318                         db->master);
 319                 return -EINVAL;
 320         }
 321
 322         ccplex = tegra_hsp_doorbell_get(hsp, TEGRA_HSP_DB_MASTER_CCPLEX);
 323         if (!ccplex)
 324                 return -ENODEV;
 325
 326         /*
 327          * On simulation platforms the BPMP hasn't had a chance yet to mark
 328          * the doorbell as ringable by the CCPLEX, so we want to skip extra
 329          * checks here.
 330          */
 331         if (tegra_is_silicon() && !tegra_hsp_doorbell_can_ring(db))
 332                 return -ENODEV;
 333
 334         spin_lock_irqsave(&hsp->lock, flags);
 335
 336         value = tegra_hsp_channel_readl(&ccplex->channel, HSP_DB_ENABLE);
 337         value |= BIT(db->master);
 338         tegra_hsp_channel_writel(&ccplex->channel, value, HSP_DB_ENABLE);
 339
 340         spin_unlock_irqrestore(&hsp->lock, flags);
 341
 342         return 0;
 343 }
 344
 345 static void tegra_hsp_doorbell_shutdown(struct mbox_chan *chan)
 346 {
 347         struct tegra_hsp_doorbell *db = chan->con_priv;
 348         struct tegra_hsp *hsp = db->channel.hsp;
 349         struct tegra_hsp_doorbell *ccplex;
 350         unsigned long flags;
 351         u32 value;
 352
 353         ccplex = tegra_hsp_doorbell_get(hsp, TEGRA_HSP_DB_MASTER_CCPLEX);
 354         if (!ccplex)
 355                 return;
 356
 357         spin_lock_irqsave(&hsp->lock, flags);
 358
 359         value = tegra_hsp_channel_readl(&ccplex->channel, HSP_DB_ENABLE);
 360         value &= ~BIT(db->master);
 361         tegra_hsp_channel_writel(&ccplex->channel, value, HSP_DB_ENABLE);
 362
 363         spin_unlock_irqrestore(&hsp->lock, flags);
 364 }
 365
 366 static const struct mbox_chan_ops tegra_hsp_db_ops = {
 367         .send_data = tegra_hsp_doorbell_send_data,
 368         .startup = tegra_hsp_doorbell_startup,
 369         .shutdown = tegra_hsp_doorbell_shutdown,
 370 };
 371
 372 static void tegra_hsp_sm_send32(struct tegra_hsp_channel *channel, void *data)
 373 {
 374         u32 value;
 375
 376         /* copy data and mark mailbox full */
 377         value = (u32)(unsigned long)data;
 378         value |= HSP_SM_SHRD_MBOX_FULL;
 379
 380         tegra_hsp_channel_writel(channel, value, HSP_SM_SHRD_MBOX);
 381 }
 382
 383 static void tegra_hsp_sm_recv32(struct tegra_hsp_channel *channel)
 384 {
 385         u32 value;
 386         void *msg;
 387
 388         value = tegra_hsp_channel_readl(channel, HSP_SM_SHRD_MBOX);
 389         value &= ~HSP_SM_SHRD_MBOX_FULL;
 390         msg = (void *)(unsigned long)value;
 391
 392         /*
 393          * Need to clear all bits here since some producers, such as TCU, depend
 394          * on fields in the register getting cleared by the consumer.
 395          *
 396          * The mailbox API doesn't give the consumers a way of doing that
 397          * explicitly, so we have to make sure we cover all possible cases.
 398          */
 399         tegra_hsp_channel_writel(channel, 0x0, HSP_SM_SHRD_MBOX);
 400
 401         mbox_chan_received_data(channel->chan, msg);
 402 }
 403
 404 static const struct tegra_hsp_sm_ops tegra_hsp_sm_32bit_ops = {
 405         .send = tegra_hsp_sm_send32,
 406         .recv = tegra_hsp_sm_recv32,
 407 };
 408
 409 static void tegra_hsp_sm_send128(struct tegra_hsp_channel *channel, void *data)
 410 {
 411         u32 value[4];
 412
 413         memcpy(value, data, sizeof(value));
 414
 415         /* Copy data */
 416         tegra_hsp_channel_writel(channel, value[0], HSP_SHRD_MBOX_TYPE1_DATA0);
 417         tegra_hsp_channel_writel(channel, value[1], HSP_SHRD_MBOX_TYPE1_DATA1);
 418         tegra_hsp_channel_writel(channel, value[2], HSP_SHRD_MBOX_TYPE1_DATA2);
 419         tegra_hsp_channel_writel(channel, value[3], HSP_SHRD_MBOX_TYPE1_DATA3);
 420
 421         /* Update tag to mark mailbox full */
 422         tegra_hsp_channel_writel(channel, HSP_SM_SHRD_MBOX_FULL,
 423                                  HSP_SHRD_MBOX_TYPE1_TAG);
 424 }
 425
 426 static void tegra_hsp_sm_recv128(struct tegra_hsp_channel *channel)
 427 {
 428         u32 value[4];
 429         void *msg;
 430
 431         value[0] = tegra_hsp_channel_readl(channel, HSP_SHRD_MBOX_TYPE1_DATA0);
 432         value[1] = tegra_hsp_channel_readl(channel, HSP_SHRD_MBOX_TYPE1_DATA1);
 433         value[2] = tegra_hsp_channel_readl(channel, HSP_SHRD_MBOX_TYPE1_DATA2);
 434         value[3] = tegra_hsp_channel_readl(channel, HSP_SHRD_MBOX_TYPE1_DATA3);
 435
 436         msg = (void *)(unsigned long)value;
 437
 438         /*
 439          * Clear data registers and tag.
 440          */
 441         tegra_hsp_channel_writel(channel, 0x0, HSP_SHRD_MBOX_TYPE1_DATA0);
 442         tegra_hsp_channel_writel(channel, 0x0, HSP_SHRD_MBOX_TYPE1_DATA1);
 443         tegra_hsp_channel_writel(channel, 0x0, HSP_SHRD_MBOX_TYPE1_DATA2);
 444         tegra_hsp_channel_writel(channel, 0x0, HSP_SHRD_MBOX_TYPE1_DATA3);
 445         tegra_hsp_channel_writel(channel, 0x0, HSP_SHRD_MBOX_TYPE1_TAG);
 446
 447         mbox_chan_received_data(channel->chan, msg);
 448 }
 449
 450 static const struct tegra_hsp_sm_ops tegra_hsp_sm_128bit_ops = {
 451         .send = tegra_hsp_sm_send128,
 452         .recv = tegra_hsp_sm_recv128,
 453 };
 454
 455 static int tegra_hsp_mailbox_send_data(struct mbox_chan *chan, void *data)
 456 {
 457         struct tegra_hsp_mailbox *mb = chan->con_priv;
 458         struct tegra_hsp *hsp = mb->channel.hsp;
 459         unsigned long flags;
 460
 461         if (WARN_ON(!mb->producer))
 462                 return -EPERM;
 463
 464         mb->ops->send(&mb->channel, data);
 465
 466         /* enable EMPTY interrupt for the shared mailbox */
 467         spin_lock_irqsave(&hsp->lock, flags);
 468
 469         hsp->mask |= BIT(HSP_INT_EMPTY_SHIFT + mb->index);
 470         tegra_hsp_writel(hsp, hsp->mask, HSP_INT_IE(hsp->shared_irq));
 471
 472         spin_unlock_irqrestore(&hsp->lock, flags);
 473
 474         return 0;
 475 }
 476
 477 static int tegra_hsp_mailbox_flush(struct mbox_chan *chan,
 478                                    unsigned long timeout)
 479 {
 480         struct tegra_hsp_mailbox *mb = chan->con_priv;
 481         struct tegra_hsp_channel *ch = &mb->channel;
 482         u32 value;
 483
 484         timeout = jiffies + msecs_to_jiffies(timeout);
 485
 486         while (time_before(jiffies, timeout)) {
 487                 value = tegra_hsp_channel_readl(ch, HSP_SM_SHRD_MBOX);
 488                 if ((value & HSP_SM_SHRD_MBOX_FULL) == 0) {
 489                         mbox_chan_txdone(chan, 0);
 490
 491                         /* Wait until channel is empty */
 492                         if (chan->active_req != NULL)
 493                                 continue;
 494
 495                         return 0;
 496                 }
 497
 498                 udelay(1);
 499         }
 500
 501         return -ETIME;
 502 }
 503
 504 static int tegra_hsp_mailbox_startup(struct mbox_chan *chan)
 505 {
 506         struct tegra_hsp_mailbox *mb = chan->con_priv;
 507         struct tegra_hsp_channel *ch = &mb->channel;
 508         struct tegra_hsp *hsp = mb->channel.hsp;
 509         unsigned long flags;
 510
 511         chan->txdone_method = TXDONE_BY_IRQ;
 512
 513         /*
 514          * Shared mailboxes start out as consumers by default. FULL and EMPTY
 515          * interrupts are coalesced at the same shared interrupt.
 516          *
 517          * Keep EMPTY interrupts disabled at startup and only enable them when
 518          * the mailbox is actually full. This is required because the FULL and
 519          * EMPTY interrupts are level-triggered, so keeping EMPTY interrupts
 520          * enabled all the time would cause an interrupt storm while mailboxes
 521          * are idle.
 522          */
 523
 524         spin_lock_irqsave(&hsp->lock, flags);
 525
 526         if (mb->producer)
 527                 hsp->mask &= ~BIT(HSP_INT_EMPTY_SHIFT + mb->index);
 528         else
 529                 hsp->mask |= BIT(HSP_INT_FULL_SHIFT + mb->index);
 530
 531         tegra_hsp_writel(hsp, hsp->mask, HSP_INT_IE(hsp->shared_irq));
 532
 533         spin_unlock_irqrestore(&hsp->lock, flags);
 534
 535         if (hsp->soc->has_per_mb_ie) {
 536                 if (mb->producer)
 537                         tegra_hsp_channel_writel(ch, 0x0,
 538                                                  HSP_SM_SHRD_MBOX_EMPTY_INT_IE);
 539                 else
 540                         tegra_hsp_channel_writel(ch, 0x1,
 541                                                  HSP_SM_SHRD_MBOX_FULL_INT_IE);
 542         }
 543
 544         return 0;
 545 }
 546
 547 static void tegra_hsp_mailbox_shutdown(struct mbox_chan *chan)
 548 {
 549         struct tegra_hsp_mailbox *mb = chan->con_priv;
 550         struct tegra_hsp_channel *ch = &mb->channel;
 551         struct tegra_hsp *hsp = mb->channel.hsp;
 552         unsigned long flags;
 553
 554         if (hsp->soc->has_per_mb_ie) {
 555                 if (mb->producer)
 556                         tegra_hsp_channel_writel(ch, 0x0,
 557                                                  HSP_SM_SHRD_MBOX_EMPTY_INT_IE);
 558                 else
 559                         tegra_hsp_channel_writel(ch, 0x0,
 560                                                  HSP_SM_SHRD_MBOX_FULL_INT_IE);
 561         }
 562
 563         spin_lock_irqsave(&hsp->lock, flags);
 564
 565         if (mb->producer)
 566                 hsp->mask &= ~BIT(HSP_INT_EMPTY_SHIFT + mb->index);
 567         else
 568                 hsp->mask &= ~BIT(HSP_INT_FULL_SHIFT + mb->index);
 569
 570         tegra_hsp_writel(hsp, hsp->mask, HSP_INT_IE(hsp->shared_irq));
 571
 572         spin_unlock_irqrestore(&hsp->lock, flags);
 573 }
 574
 575 static const struct mbox_chan_ops tegra_hsp_sm_ops = {
 576         .send_data = tegra_hsp_mailbox_send_data,
 577         .flush = tegra_hsp_mailbox_flush,
 578         .startup = tegra_hsp_mailbox_startup,
 579         .shutdown = tegra_hsp_mailbox_shutdown,
 580 };
 581
 582 static struct mbox_chan *tegra_hsp_db_xlate(struct mbox_controller *mbox,
 583                                             const struct of_phandle_args *args)
 584 {
 585         struct tegra_hsp *hsp = container_of(mbox, struct tegra_hsp, mbox_db);
 586         unsigned int type = args->args[0], master = args->args[1];
 587         struct tegra_hsp_channel *channel = ERR_PTR(-ENODEV);
 588         struct tegra_hsp_doorbell *db;
 589         struct mbox_chan *chan;
 590         unsigned long flags;
 591         unsigned int i;
 592
 593         if (type != TEGRA_HSP_MBOX_TYPE_DB || !hsp->doorbell_irq)
 594                 return ERR_PTR(-ENODEV);
 595
 596         db = tegra_hsp_doorbell_get(hsp, master);
 597         if (db)
 598                 channel = &db->channel;
 599
 600         if (IS_ERR(channel))
 601                 return ERR_CAST(channel);
 602
 603         spin_lock_irqsave(&hsp->lock, flags);
 604
 605         for (i = 0; i < mbox->num_chans; i++) {
 606                 chan = &mbox->chans[i];
 607                 if (!chan->con_priv) {
 608                         channel->chan = chan;
 609                         chan->con_priv = db;
 610                         break;
 611                 }
 612
 613                 chan = NULL;
 614         }
 615
 616         spin_unlock_irqrestore(&hsp->lock, flags);
 617
 618         return chan ?: ERR_PTR(-EBUSY);
 619 }
 620
 621 static struct mbox_chan *tegra_hsp_sm_xlate(struct mbox_controller *mbox,
 622                                             const struct of_phandle_args *args)
 623 {
 624         struct tegra_hsp *hsp = container_of(mbox, struct tegra_hsp, mbox_sm);
 625         unsigned int type = args->args[0], index;
 626         struct tegra_hsp_mailbox *mb;
 627
 628         index = args->args[1] & TEGRA_HSP_SM_MASK;
 629
 630         if ((type & HSP_MBOX_TYPE_MASK) != TEGRA_HSP_MBOX_TYPE_SM ||
 631             !hsp->shared_irqs || index >= hsp->num_sm)
 632                 return ERR_PTR(-ENODEV);
 633
 634         mb = &hsp->mailboxes[index];
 635
 636         if (type & TEGRA_HSP_MBOX_TYPE_SM_128BIT) {
 637                 if (!hsp->soc->has_128_bit_mb)
 638                         return ERR_PTR(-ENODEV);
 639
 640                 mb->ops = &tegra_hsp_sm_128bit_ops;
 641         } else {
 642                 mb->ops = &tegra_hsp_sm_32bit_ops;
 643         }
 644
 645         if ((args->args[1] & TEGRA_HSP_SM_FLAG_TX) == 0)
 646                 mb->producer = false;
 647         else
 648                 mb->producer = true;
 649
 650         return mb->channel.chan;
 651 }
 652
 653 static int tegra_hsp_add_doorbells(struct tegra_hsp *hsp)
 654 {
 655         const struct tegra_hsp_db_map *map = hsp->soc->map;
 656         struct tegra_hsp_channel *channel;
 657
 658         while (map->name) {
 659                 channel = tegra_hsp_doorbell_create(hsp, map->name,
 660                                                     map->master, map->index);
 661                 if (IS_ERR(channel))
 662                         return PTR_ERR(channel);
 663
 664                 map++;
 665         }
 666
 667         return 0;
 668 }
 669
 670 static int tegra_hsp_add_mailboxes(struct tegra_hsp *hsp, struct device *dev)
 671 {
 672         int i;
 673
 674         hsp->mailboxes = devm_kcalloc(dev, hsp->num_sm, sizeof(*hsp->mailboxes),
 675                                       GFP_KERNEL);
 676         if (!hsp->mailboxes)
 677                 return -ENOMEM;
 678
 679         for (i = 0; i < hsp->num_sm; i++) {
 680                 struct tegra_hsp_mailbox *mb = &hsp->mailboxes[i];
 681
 682                 mb->index = i;
 683
 684                 mb->channel.hsp = hsp;
 685                 mb->channel.regs = hsp->regs + SZ_64K + i * SZ_32K;
 686                 mb->channel.chan = &hsp->mbox_sm.chans[i];
 687                 mb->channel.chan->con_priv = mb;
 688         }
 689
 690         return 0;
 691 }
 692
 693 static int tegra_hsp_request_shared_irq(struct tegra_hsp *hsp)
 694 {
 695         unsigned int i, irq = 0;
 696         int err;
 697
 698         for (i = 0; i < hsp->num_si; i++) {
 699                 irq = hsp->shared_irqs[i];
 700                 if (irq <= 0)
 701                         continue;
 702
 703                 err = devm_request_irq(hsp->dev, irq, tegra_hsp_shared_irq, 0,
 704                                        dev_name(hsp->dev), hsp);
 705                 if (err < 0) {
 706                         dev_err(hsp->dev, "failed to request interrupt: %d\n",
 707                                 err);
 708                         continue;
 709                 }
 710
 711                 hsp->shared_irq = i;
 712
 713                 /* disable all interrupts */
 714                 tegra_hsp_writel(hsp, 0, HSP_INT_IE(hsp->shared_irq));
 715
 716                 dev_dbg(hsp->dev, "interrupt requested: %u\n", irq);
 717
 718                 break;
 719         }
 720
 721         if (i == hsp->num_si) {
 722                 dev_err(hsp->dev, "failed to find available interrupt\n");
 723                 return -ENOENT;
 724         }
 725
 726         return 0;
 727 }
 728
 729 static int tegra_hsp_probe(struct platform_device *pdev)
 730 {
 731         struct tegra_hsp *hsp;
 732         unsigned int i;
 733         u32 value;
 734         int err;
 735
 736         hsp = devm_kzalloc(&pdev->dev, sizeof(*hsp), GFP_KERNEL);
 737         if (!hsp)
 738                 return -ENOMEM;
 739
 740         hsp->dev = &pdev->dev;
 741         hsp->soc = of_device_get_match_data(&pdev->dev);
 742         INIT_LIST_HEAD(&hsp->doorbells);
 743         spin_lock_init(&hsp->lock);
 744
 745         hsp->regs = devm_platform_ioremap_resource(pdev, 0);
 746         if (IS_ERR(hsp->regs))
 747                 return PTR_ERR(hsp->regs);
 748
 749         value = tegra_hsp_readl(hsp, HSP_INT_DIMENSIONING);
 750         hsp->num_sm = (value >> HSP_nSM_SHIFT) & HSP_nINT_MASK;
 751         hsp->num_ss = (value >> HSP_nSS_SHIFT) & HSP_nINT_MASK;
 752         hsp->num_as = (value >> HSP_nAS_SHIFT) & HSP_nINT_MASK;
 753         hsp->num_db = (value >> HSP_nDB_SHIFT) & HSP_nINT_MASK;
 754         hsp->num_si = (value >> HSP_nSI_SHIFT) & HSP_nINT_MASK;
 755
 756         err = platform_get_irq_byname_optional(pdev, "doorbell");
 757         if (err >= 0)
 758                 hsp->doorbell_irq = err;
 759
 760         if (hsp->num_si > 0) {
 761                 unsigned int count = 0;
 762
 763                 hsp->shared_irqs = devm_kcalloc(&pdev->dev, hsp->num_si,
 764                                                 sizeof(*hsp->shared_irqs),
 765                                                 GFP_KERNEL);
 766                 if (!hsp->shared_irqs)
 767                         return -ENOMEM;
 768
 769                 for (i = 0; i < hsp->num_si; i++) {
 770                         char *name;
 771
 772                         name = kasprintf(GFP_KERNEL, "shared%u", i);
 773                         if (!name)
 774                                 return -ENOMEM;
 775
 776                         err = platform_get_irq_byname_optional(pdev, name);
 777                         if (err >= 0) {
 778                                 hsp->shared_irqs[i] = err;
 779                                 count++;
 780                         }
 781
 782                         kfree(name);
 783                 }
 784
 785                 if (count == 0) {
 786                         devm_kfree(&pdev->dev, hsp->shared_irqs);
 787                         hsp->shared_irqs = NULL;
 788                 }
 789         }
 790
 791         /* setup the doorbell controller */
 792         hsp->mbox_db.of_xlate = tegra_hsp_db_xlate;
 793         hsp->mbox_db.num_chans = 32;
 794         hsp->mbox_db.dev = &pdev->dev;
 795         hsp->mbox_db.ops = &tegra_hsp_db_ops;
 796
 797         hsp->mbox_db.chans = devm_kcalloc(&pdev->dev, hsp->mbox_db.num_chans,
 798                                           sizeof(*hsp->mbox_db.chans),
 799                                           GFP_KERNEL);
 800         if (!hsp->mbox_db.chans)
 801                 return -ENOMEM;
 802
 803         if (hsp->doorbell_irq) {
 804                 err = tegra_hsp_add_doorbells(hsp);
 805                 if (err < 0) {
 806                         dev_err(&pdev->dev, "failed to add doorbells: %d\n",
 807                                 err);
 808                         return err;
 809                 }
 810         }
 811
 812         err = devm_mbox_controller_register(&pdev->dev, &hsp->mbox_db);
 813         if (err < 0) {
 814                 dev_err(&pdev->dev, "failed to register doorbell mailbox: %d\n",
 815                         err);
 816                 return err;
 817         }
 818
 819         /* setup the shared mailbox controller */
 820         hsp->mbox_sm.of_xlate = tegra_hsp_sm_xlate;
 821         hsp->mbox_sm.num_chans = hsp->num_sm;
 822         hsp->mbox_sm.dev = &pdev->dev;
 823         hsp->mbox_sm.ops = &tegra_hsp_sm_ops;
 824
 825         hsp->mbox_sm.chans = devm_kcalloc(&pdev->dev, hsp->mbox_sm.num_chans,
 826                                           sizeof(*hsp->mbox_sm.chans),
 827                                           GFP_KERNEL);
 828         if (!hsp->mbox_sm.chans)
 829                 return -ENOMEM;
 830
 831         if (hsp->shared_irqs) {
 832                 err = tegra_hsp_add_mailboxes(hsp, &pdev->dev);
 833                 if (err < 0) {
 834                         dev_err(&pdev->dev, "failed to add mailboxes: %d\n",
 835                                 err);
 836                         return err;
 837                 }
 838         }
 839
 840         err = devm_mbox_controller_register(&pdev->dev, &hsp->mbox_sm);
 841         if (err < 0) {
 842                 dev_err(&pdev->dev, "failed to register shared mailbox: %d\n",
 843                         err);
 844                 return err;
 845         }
 846
 847         platform_set_drvdata(pdev, hsp);
 848
 849         if (hsp->doorbell_irq) {
 850                 err = devm_request_irq(&pdev->dev, hsp->doorbell_irq,
 851                                        tegra_hsp_doorbell_irq, IRQF_NO_SUSPEND,
 852                                        dev_name(&pdev->dev), hsp);
 853                 if (err < 0) {
 854                         dev_err(&pdev->dev,
 855                                 "failed to request doorbell IRQ#%u: %d\n",
 856                                 hsp->doorbell_irq, err);
 857                         return err;
 858                 }
 859         }
 860
 861         if (hsp->shared_irqs) {
 862                 err = tegra_hsp_request_shared_irq(hsp);
 863                 if (err < 0)
 864                         return err;
 865         }
 866
 867         lockdep_register_key(&hsp->lock_key);
 868         lockdep_set_class(&hsp->lock, &hsp->lock_key);
 869
 870         return 0;
 871 }
 872
 873 static void tegra_hsp_remove(struct platform_device *pdev)
 874 {
 875         struct tegra_hsp *hsp = platform_get_drvdata(pdev);
 876
 877         lockdep_unregister_key(&hsp->lock_key);
 878 }
 879
 880 static int __maybe_unused tegra_hsp_resume(struct device *dev)
 881 {
 882         struct tegra_hsp *hsp = dev_get_drvdata(dev);
 883         unsigned int i;
 884         struct tegra_hsp_doorbell *db;
 885
 886         list_for_each_entry(db, &hsp->doorbells, list) {
 887                 if (db->channel.chan)
 888                         tegra_hsp_doorbell_startup(db->channel.chan);
 889         }
 890
 891         if (hsp->mailboxes) {
 892                 for (i = 0; i < hsp->num_sm; i++) {
 893                         struct tegra_hsp_mailbox *mb = &hsp->mailboxes[i];
 894
 895                         if (mb->channel.chan->cl)
 896                                 tegra_hsp_mailbox_startup(mb->channel.chan);
 897                 }
 898         }
 899
 900         return 0;
 901 }
 902
 903 static const struct dev_pm_ops tegra_hsp_pm_ops = {
 904         .resume_noirq = tegra_hsp_resume,
 905 };
 906
 907 static const struct tegra_hsp_db_map tegra186_hsp_db_map[] = {
 908         { "ccplex", TEGRA_HSP_DB_MASTER_CCPLEX, HSP_DB_CCPLEX, },
 909         { "bpmp",   TEGRA_HSP_DB_MASTER_BPMP,   HSP_DB_BPMP,   },
 910         { /* sentinel */ }
 911 };
 912
 913 static const struct tegra_hsp_soc tegra186_hsp_soc = {
 914         .map = tegra186_hsp_db_map,
 915         .has_per_mb_ie = false,
 916         .has_128_bit_mb = false,
 917         .reg_stride = 0x100,
 918 };
 919
 920 static const struct tegra_hsp_soc tegra194_hsp_soc = {
 921         .map = tegra186_hsp_db_map,
 922         .has_per_mb_ie = true,
 923         .has_128_bit_mb = false,
 924         .reg_stride = 0x100,
 925 };
 926
 927 static const struct tegra_hsp_soc tegra234_hsp_soc = {
 928         .map = tegra186_hsp_db_map,
 929         .has_per_mb_ie = false,
 930         .has_128_bit_mb = true,
 931         .reg_stride = 0x100,
 932 };
 933
 934 static const struct tegra_hsp_soc tegra264_hsp_soc = {
 935         .map = tegra186_hsp_db_map,
 936         .has_per_mb_ie = false,
 937         .has_128_bit_mb = true,
 938         .reg_stride = 0x1000,
 939 };
 940
 941 static const struct of_device_id tegra_hsp_match[] = {
 942         { .compatible = "nvidia,tegra186-hsp", .data = &tegra186_hsp_soc },
 943         { .compatible = "nvidia,tegra194-hsp", .data = &tegra194_hsp_soc },
 944         { .compatible = "nvidia,tegra234-hsp", .data = &tegra234_hsp_soc },
 945         { .compatible = "nvidia,tegra264-hsp", .data = &tegra264_hsp_soc },
 946         { }
 947 };
 948
 949 static struct platform_driver tegra_hsp_driver = {
 950         .driver = {
 951                 .name = "tegra-hsp",
 952                 .of_match_table = tegra_hsp_match,
 953                 .pm = &tegra_hsp_pm_ops,
 954         },
 955         .probe = tegra_hsp_probe,
 956         .remove = tegra_hsp_remove,
 957 };
 958
 959 static int __init tegra_hsp_init(void)
 960 {
 961         return platform_driver_register(&tegra_hsp_driver);
 962 }
 963 core_initcall(tegra_hsp_init);