drivers/soc/qcom/smp2p.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (c) 2015, Sony Mobile Communications AB.
   4  * Copyright (c) 2012-2013, The Linux Foundation. All rights reserved.
   5  */
   6
   7 #include <linux/interrupt.h>
   8 #include <linux/list.h>
   9 #include <linux/io.h>
  10 #include <linux/of.h>
  11 #include <linux/irq.h>
  12 #include <linux/irqdomain.h>
  13 #include <linux/mailbox_client.h>
  14 #include <linux/mfd/syscon.h>
  15 #include <linux/module.h>
  16 #include <linux/platform_device.h>
  17 #include <linux/pm_wakeirq.h>
  18 #include <linux/regmap.h>
  19 #include <linux/seq_file.h>
  20 #include <linux/soc/qcom/smem.h>
  21 #include <linux/soc/qcom/smem_state.h>
  22 #include <linux/spinlock.h>
  23
  24 /*
  25  * The Shared Memory Point to Point (SMP2P) protocol facilitates communication
  26  * of a single 32-bit value between two processors.  Each value has a single
  27  * writer (the local side) and a single reader (the remote side). Values are
  28  * uniquely identified in the system by the directed edge (local processor ID
  29  * to remote processor ID) and a string identifier.
  30  *
  31  * Each processor is responsible for creating the outgoing SMEM items and each
  32  * item is writable by the local processor and readable by the remote
  33  * processor.  By using two separate SMEM items that are single-reader and
  34  * single-writer, SMP2P does not require any remote locking mechanisms.
  35  *
  36  * The driver uses the Linux GPIO and interrupt framework to expose a virtual
  37  * GPIO for each outbound entry and a virtual interrupt controller for each
  38  * inbound entry.
  39  */
  40
  41 #define SMP2P_MAX_ENTRY 16
  42 #define SMP2P_MAX_ENTRY_NAME 16
  43
  44 #define SMP2P_FEATURE_SSR_ACK 0x1
  45 #define SMP2P_FLAGS_RESTART_DONE_BIT 0
  46 #define SMP2P_FLAGS_RESTART_ACK_BIT 1
  47
  48 #define SMP2P_MAGIC 0x504d5324
  49 #define SMP2P_ALL_FEATURES      SMP2P_FEATURE_SSR_ACK
  50
  51 /**
  52  * struct smp2p_smem_item - in memory communication structure
  53  * @magic:              magic number
  54  * @version:            version - must be 1
  55  * @features:           features flag - currently unused
  56  * @local_pid:          processor id of sending end
  57  * @remote_pid:         processor id of receiving end
  58  * @total_entries:      number of entries - always SMP2P_MAX_ENTRY
  59  * @valid_entries:      number of allocated entries
  60  * @flags:
  61  * @entries:            individual communication entries
  62  * @entries.name:       name of the entry
  63  * @entries.value:      content of the entry
  64  */
  65 struct smp2p_smem_item {
  66         u32 magic;
  67         u8 version;
  68         unsigned features:24;
  69         u16 local_pid;
  70         u16 remote_pid;
  71         u16 total_entries;
  72         u16 valid_entries;
  73         u32 flags;
  74
  75         struct {
  76                 u8 name[SMP2P_MAX_ENTRY_NAME];
  77                 u32 value;
  78         } entries[SMP2P_MAX_ENTRY];
  79 } __packed;
  80
  81 /**
  82  * struct smp2p_entry - driver context matching one entry
  83  * @node:       list entry to keep track of allocated entries
  84  * @smp2p:      reference to the device driver context
  85  * @name:       name of the entry, to match against smp2p_smem_item
  86  * @value:      pointer to smp2p_smem_item entry value
  87  * @last_value: last handled value
  88  * @domain:     irq_domain for inbound entries
  89  * @irq_enabled:bitmap to track enabled irq bits
  90  * @irq_rising: bitmap to mark irq bits for rising detection
  91  * @irq_falling:bitmap to mark irq bits for falling detection
  92  * @state:      smem state handle
  93  * @lock:       spinlock to protect read-modify-write of the value
  94  */
  95 struct smp2p_entry {
  96         struct list_head node;
  97         struct qcom_smp2p *smp2p;
  98
  99         const char *name;
 100         u32 *value;
 101         u32 last_value;
 102
 103         struct irq_domain *domain;
 104         DECLARE_BITMAP(irq_enabled, 32);
 105         DECLARE_BITMAP(irq_rising, 32);
 106         DECLARE_BITMAP(irq_falling, 32);
 107
 108         struct qcom_smem_state *state;
 109
 110         spinlock_t lock;
 111 };
 112
 113 #define SMP2P_INBOUND   0
 114 #define SMP2P_OUTBOUND  1
 115
 116 /**
 117  * struct qcom_smp2p - device driver context
 118  * @dev:        device driver handle
 119  * @in:         pointer to the inbound smem item
 120  * @out:        pointer to the outbound smem item
 121  * @smem_items: ids of the two smem items
 122  * @valid_entries: already scanned inbound entries
 123  * @ssr_ack_enabled: SMP2P_FEATURE_SSR_ACK feature is supported and was enabled
 124  * @ssr_ack: current cached state of the local ack bit
 125  * @negotiation_done: whether negotiating finished
 126  * @local_pid:  processor id of the inbound edge
 127  * @remote_pid: processor id of the outbound edge
 128  * @ipc_regmap: regmap for the outbound ipc
 129  * @ipc_offset: offset within the regmap
 130  * @ipc_bit:    bit in regmap@offset to kick to signal remote processor
 131  * @mbox_client: mailbox client handle
 132  * @mbox_chan:  apcs ipc mailbox channel handle
 133  * @inbound:    list of inbound entries
 134  * @outbound:   list of outbound entries
 135  */
 136 struct qcom_smp2p {
 137         struct device *dev;
 138
 139         struct smp2p_smem_item *in;
 140         struct smp2p_smem_item *out;
 141
 142         unsigned smem_items[SMP2P_OUTBOUND + 1];
 143
 144         unsigned valid_entries;
 145
 146         bool ssr_ack_enabled;
 147         bool ssr_ack;
 148         bool negotiation_done;
 149
 150         unsigned local_pid;
 151         unsigned remote_pid;
 152
 153         struct regmap *ipc_regmap;
 154         int ipc_offset;
 155         int ipc_bit;
 156
 157         struct mbox_client mbox_client;
 158         struct mbox_chan *mbox_chan;
 159
 160         struct list_head inbound;
 161         struct list_head outbound;
 162 };
 163
 164 #define CREATE_TRACE_POINTS
 165 #include "trace-smp2p.h"
 166
 167 static void qcom_smp2p_kick(struct qcom_smp2p *smp2p)
 168 {
 169         /* Make sure any updated data is written before the kick */
 170         wmb();
 171
 172         if (smp2p->mbox_chan) {
 173                 mbox_send_message(smp2p->mbox_chan, NULL);
 174                 mbox_client_txdone(smp2p->mbox_chan, 0);
 175         } else {
 176                 regmap_write(smp2p->ipc_regmap, smp2p->ipc_offset, BIT(smp2p->ipc_bit));
 177         }
 178 }
 179
 180 static bool qcom_smp2p_check_ssr(struct qcom_smp2p *smp2p)
 181 {
 182         struct smp2p_smem_item *in = smp2p->in;
 183         bool restart;
 184
 185         if (!smp2p->ssr_ack_enabled)
 186                 return false;
 187
 188         restart = in->flags & BIT(SMP2P_FLAGS_RESTART_DONE_BIT);
 189
 190         return restart != smp2p->ssr_ack;
 191 }
 192
 193 static void qcom_smp2p_do_ssr_ack(struct qcom_smp2p *smp2p)
 194 {
 195         struct smp2p_smem_item *out = smp2p->out;
 196         u32 val;
 197
 198         trace_smp2p_ssr_ack(smp2p->dev);
 199         smp2p->ssr_ack = !smp2p->ssr_ack;
 200
 201         val = out->flags & ~BIT(SMP2P_FLAGS_RESTART_ACK_BIT);
 202         if (smp2p->ssr_ack)
 203                 val |= BIT(SMP2P_FLAGS_RESTART_ACK_BIT);
 204         out->flags = val;
 205
 206         qcom_smp2p_kick(smp2p);
 207 }
 208
 209 static void qcom_smp2p_negotiate(struct qcom_smp2p *smp2p)
 210 {
 211         struct smp2p_smem_item *out = smp2p->out;
 212         struct smp2p_smem_item *in = smp2p->in;
 213
 214         if (in->version == out->version) {
 215                 out->features &= in->features;
 216
 217                 if (out->features & SMP2P_FEATURE_SSR_ACK)
 218                         smp2p->ssr_ack_enabled = true;
 219
 220                 smp2p->negotiation_done = true;
 221                 trace_smp2p_negotiate(smp2p->dev, out->features);
 222         }
 223 }
 224
 225 static void qcom_smp2p_notify_in(struct qcom_smp2p *smp2p)
 226 {
 227         struct smp2p_smem_item *in;
 228         struct smp2p_entry *entry;
 229         int irq_pin;
 230         u32 status;
 231         char buf[SMP2P_MAX_ENTRY_NAME];
 232         u32 val;
 233         int i;
 234
 235         in = smp2p->in;
 236
 237         /* Match newly created entries */
 238         for (i = smp2p->valid_entries; i < in->valid_entries; i++) {
 239                 list_for_each_entry(entry, &smp2p->inbound, node) {
 240                         memcpy(buf, in->entries[i].name, sizeof(buf));
 241                         if (!strcmp(buf, entry->name)) {
 242                                 entry->value = &in->entries[i].value;
 243                                 break;
 244                         }
 245                 }
 246         }
 247         smp2p->valid_entries = i;
 248
 249         /* Fire interrupts based on any value changes */
 250         list_for_each_entry(entry, &smp2p->inbound, node) {
 251                 /* Ignore entries not yet allocated by the remote side */
 252                 if (!entry->value)
 253                         continue;
 254
 255                 val = readl(entry->value);
 256
 257                 status = val ^ entry->last_value;
 258                 entry->last_value = val;
 259
 260                 trace_smp2p_notify_in(entry, status, val);
 261
 262                 /* No changes of this entry? */
 263                 if (!status)
 264                         continue;
 265
 266                 for_each_set_bit(i, entry->irq_enabled, 32) {
 267                         if (!(status & BIT(i)))
 268                                 continue;
 269
 270                         if ((val & BIT(i) && test_bit(i, entry->irq_rising)) ||
 271                             (!(val & BIT(i)) && test_bit(i, entry->irq_falling))) {
 272                                 irq_pin = irq_find_mapping(entry->domain, i);
 273                                 handle_nested_irq(irq_pin);
 274                         }
 275                 }
 276         }
 277 }
 278
 279 /**
 280  * qcom_smp2p_intr() - interrupt handler for incoming notifications
 281  * @irq:        unused
 282  * @data:       smp2p driver context
 283  *
 284  * Handle notifications from the remote side to handle newly allocated entries
 285  * or any changes to the state bits of existing entries.
 286  *
 287  * Return: %IRQ_HANDLED
 288  */
 289 static irqreturn_t qcom_smp2p_intr(int irq, void *data)
 290 {
 291         struct smp2p_smem_item *in;
 292         struct qcom_smp2p *smp2p = data;
 293         unsigned int smem_id = smp2p->smem_items[SMP2P_INBOUND];
 294         unsigned int pid = smp2p->remote_pid;
 295         bool ack_restart;
 296         size_t size;
 297
 298         in = smp2p->in;
 299
 300         /* Acquire smem item, if not already found */
 301         if (!in) {
 302                 in = qcom_smem_get(pid, smem_id, &size);
 303                 if (IS_ERR(in)) {
 304                         dev_err(smp2p->dev,
 305                                 "Unable to acquire remote smp2p item\n");
 306                         goto out;
 307                 }
 308
 309                 smp2p->in = in;
 310         }
 311
 312         if (!smp2p->negotiation_done)
 313                 qcom_smp2p_negotiate(smp2p);
 314
 315         if (smp2p->negotiation_done) {
 316                 ack_restart = qcom_smp2p_check_ssr(smp2p);
 317                 qcom_smp2p_notify_in(smp2p);
 318
 319                 if (ack_restart)
 320                         qcom_smp2p_do_ssr_ack(smp2p);
 321         }
 322
 323 out:
 324         return IRQ_HANDLED;
 325 }
 326
 327 static void smp2p_mask_irq(struct irq_data *irqd)
 328 {
 329         struct smp2p_entry *entry = irq_data_get_irq_chip_data(irqd);
 330         irq_hw_number_t irq = irqd_to_hwirq(irqd);
 331
 332         clear_bit(irq, entry->irq_enabled);
 333 }
 334
 335 static void smp2p_unmask_irq(struct irq_data *irqd)
 336 {
 337         struct smp2p_entry *entry = irq_data_get_irq_chip_data(irqd);
 338         irq_hw_number_t irq = irqd_to_hwirq(irqd);
 339
 340         set_bit(irq, entry->irq_enabled);
 341 }
 342
 343 static int smp2p_set_irq_type(struct irq_data *irqd, unsigned int type)
 344 {
 345         struct smp2p_entry *entry = irq_data_get_irq_chip_data(irqd);
 346         irq_hw_number_t irq = irqd_to_hwirq(irqd);
 347
 348         if (!(type & IRQ_TYPE_EDGE_BOTH))
 349                 return -EINVAL;
 350
 351         if (type & IRQ_TYPE_EDGE_RISING)
 352                 set_bit(irq, entry->irq_rising);
 353         else
 354                 clear_bit(irq, entry->irq_rising);
 355
 356         if (type & IRQ_TYPE_EDGE_FALLING)
 357                 set_bit(irq, entry->irq_falling);
 358         else
 359                 clear_bit(irq, entry->irq_falling);
 360
 361         return 0;
 362 }
 363
 364 static void smp2p_irq_print_chip(struct irq_data *irqd, struct seq_file *p)
 365 {
 366         struct smp2p_entry *entry = irq_data_get_irq_chip_data(irqd);
 367
 368         seq_printf(p, " %8s", dev_name(entry->smp2p->dev));
 369 }
 370
 371 static struct irq_chip smp2p_irq_chip = {
 372         .name           = "smp2p",
 373         .irq_mask       = smp2p_mask_irq,
 374         .irq_unmask     = smp2p_unmask_irq,
 375         .irq_set_type   = smp2p_set_irq_type,
 376         .irq_print_chip = smp2p_irq_print_chip,
 377 };
 378
 379 static int smp2p_irq_map(struct irq_domain *d,
 380                          unsigned int irq,
 381                          irq_hw_number_t hw)
 382 {
 383         struct smp2p_entry *entry = d->host_data;
 384
 385         irq_set_chip_and_handler(irq, &smp2p_irq_chip, handle_level_irq);
 386         irq_set_chip_data(irq, entry);
 387         irq_set_nested_thread(irq, 1);
 388         irq_set_noprobe(irq);
 389
 390         return 0;
 391 }
 392
 393 static const struct irq_domain_ops smp2p_irq_ops = {
 394         .map = smp2p_irq_map,
 395         .xlate = irq_domain_xlate_twocell,
 396 };
 397
 398 static int qcom_smp2p_inbound_entry(struct qcom_smp2p *smp2p,
 399                                     struct smp2p_entry *entry,
 400                                     struct device_node *node)
 401 {
 402         entry->domain = irq_domain_add_linear(node, 32, &smp2p_irq_ops, entry);
 403         if (!entry->domain) {
 404                 dev_err(smp2p->dev, "failed to add irq_domain\n");
 405                 return -ENOMEM;
 406         }
 407
 408         return 0;
 409 }
 410
 411 static int smp2p_update_bits(void *data, u32 mask, u32 value)
 412 {
 413         struct smp2p_entry *entry = data;
 414         unsigned long flags;
 415         u32 orig;
 416         u32 val;
 417
 418         spin_lock_irqsave(&entry->lock, flags);
 419         val = orig = readl(entry->value);
 420         val &= ~mask;
 421         val |= value;
 422         writel(val, entry->value);
 423         spin_unlock_irqrestore(&entry->lock, flags);
 424
 425         trace_smp2p_update_bits(entry, orig, val);
 426
 427         if (val != orig)
 428                 qcom_smp2p_kick(entry->smp2p);
 429
 430         return 0;
 431 }
 432
 433 static const struct qcom_smem_state_ops smp2p_state_ops = {
 434         .update_bits = smp2p_update_bits,
 435 };
 436
 437 static int qcom_smp2p_outbound_entry(struct qcom_smp2p *smp2p,
 438                                      struct smp2p_entry *entry,
 439                                      struct device_node *node)
 440 {
 441         struct smp2p_smem_item *out = smp2p->out;
 442         char buf[SMP2P_MAX_ENTRY_NAME] = {};
 443
 444         /* Allocate an entry from the smem item */
 445         strscpy(buf, entry->name, SMP2P_MAX_ENTRY_NAME);
 446         memcpy(out->entries[out->valid_entries].name, buf, SMP2P_MAX_ENTRY_NAME);
 447
 448         /* Make the logical entry reference the physical value */
 449         entry->value = &out->entries[out->valid_entries].value;
 450
 451         out->valid_entries++;
 452
 453         entry->state = qcom_smem_state_register(node, &smp2p_state_ops, entry);
 454         if (IS_ERR(entry->state)) {
 455                 dev_err(smp2p->dev, "failed to register qcom_smem_state\n");
 456                 return PTR_ERR(entry->state);
 457         }
 458
 459         return 0;
 460 }
 461
 462 static int qcom_smp2p_alloc_outbound_item(struct qcom_smp2p *smp2p)
 463 {
 464         struct smp2p_smem_item *out;
 465         unsigned smem_id = smp2p->smem_items[SMP2P_OUTBOUND];
 466         unsigned pid = smp2p->remote_pid;
 467         int ret;
 468
 469         ret = qcom_smem_alloc(pid, smem_id, sizeof(*out));
 470         if (ret < 0 && ret != -EEXIST) {
 471                 if (ret != -EPROBE_DEFER)
 472                         dev_err(smp2p->dev,
 473                                 "unable to allocate local smp2p item\n");
 474                 return ret;
 475         }
 476
 477         out = qcom_smem_get(pid, smem_id, NULL);
 478         if (IS_ERR(out)) {
 479                 dev_err(smp2p->dev, "Unable to acquire local smp2p item\n");
 480                 return PTR_ERR(out);
 481         }
 482
 483         memset(out, 0, sizeof(*out));
 484         out->magic = SMP2P_MAGIC;
 485         out->local_pid = smp2p->local_pid;
 486         out->remote_pid = smp2p->remote_pid;
 487         out->total_entries = SMP2P_MAX_ENTRY;
 488         out->valid_entries = 0;
 489         out->features = SMP2P_ALL_FEATURES;
 490
 491         /*
 492          * Make sure the rest of the header is written before we validate the
 493          * item by writing a valid version number.
 494          */
 495         wmb();
 496         out->version = 1;
 497
 498         qcom_smp2p_kick(smp2p);
 499
 500         smp2p->out = out;
 501
 502         return 0;
 503 }
 504
 505 static int smp2p_parse_ipc(struct qcom_smp2p *smp2p)
 506 {
 507         struct device_node *syscon;
 508         struct device *dev = smp2p->dev;
 509         const char *key;
 510         int ret;
 511
 512         syscon = of_parse_phandle(dev->of_node, "qcom,ipc", 0);
 513         if (!syscon) {
 514                 dev_err(dev, "no qcom,ipc node\n");
 515                 return -ENODEV;
 516         }
 517
 518         smp2p->ipc_regmap = syscon_node_to_regmap(syscon);
 519         of_node_put(syscon);
 520         if (IS_ERR(smp2p->ipc_regmap))
 521                 return PTR_ERR(smp2p->ipc_regmap);
 522
 523         key = "qcom,ipc";
 524         ret = of_property_read_u32_index(dev->of_node, key, 1, &smp2p->ipc_offset);
 525         if (ret < 0) {
 526                 dev_err(dev, "no offset in %s\n", key);
 527                 return -EINVAL;
 528         }
 529
 530         ret = of_property_read_u32_index(dev->of_node, key, 2, &smp2p->ipc_bit);
 531         if (ret < 0) {
 532                 dev_err(dev, "no bit in %s\n", key);
 533                 return -EINVAL;
 534         }
 535
 536         return 0;
 537 }
 538
 539 static int qcom_smp2p_probe(struct platform_device *pdev)
 540 {
 541         struct smp2p_entry *entry;
 542         struct qcom_smp2p *smp2p;
 543         const char *key;
 544         int irq;
 545         int ret;
 546
 547         smp2p = devm_kzalloc(&pdev->dev, sizeof(*smp2p), GFP_KERNEL);
 548         if (!smp2p)
 549                 return -ENOMEM;
 550
 551         smp2p->dev = &pdev->dev;
 552         INIT_LIST_HEAD(&smp2p->inbound);
 553         INIT_LIST_HEAD(&smp2p->outbound);
 554
 555         platform_set_drvdata(pdev, smp2p);
 556
 557         key = "qcom,smem";
 558         ret = of_property_read_u32_array(pdev->dev.of_node, key,
 559                                          smp2p->smem_items, 2);
 560         if (ret)
 561                 return ret;
 562
 563         key = "qcom,local-pid";
 564         ret = of_property_read_u32(pdev->dev.of_node, key, &smp2p->local_pid);
 565         if (ret)
 566                 goto report_read_failure;
 567
 568         key = "qcom,remote-pid";
 569         ret = of_property_read_u32(pdev->dev.of_node, key, &smp2p->remote_pid);
 570         if (ret)
 571                 goto report_read_failure;
 572
 573         irq = platform_get_irq(pdev, 0);
 574         if (irq < 0)
 575                 return irq;
 576
 577         smp2p->mbox_client.dev = &pdev->dev;
 578         smp2p->mbox_client.knows_txdone = true;
 579         smp2p->mbox_chan = mbox_request_channel(&smp2p->mbox_client, 0);
 580         if (IS_ERR(smp2p->mbox_chan)) {
 581                 if (PTR_ERR(smp2p->mbox_chan) != -ENODEV)
 582                         return PTR_ERR(smp2p->mbox_chan);
 583
 584                 smp2p->mbox_chan = NULL;
 585
 586                 ret = smp2p_parse_ipc(smp2p);
 587                 if (ret)
 588                         return ret;
 589         }
 590
 591         ret = qcom_smp2p_alloc_outbound_item(smp2p);
 592         if (ret < 0)
 593                 goto release_mbox;
 594
 595         for_each_available_child_of_node_scoped(pdev->dev.of_node, node) {
 596                 entry = devm_kzalloc(&pdev->dev, sizeof(*entry), GFP_KERNEL);
 597                 if (!entry) {
 598                         ret = -ENOMEM;
 599                         goto unwind_interfaces;
 600                 }
 601
 602                 entry->smp2p = smp2p;
 603                 spin_lock_init(&entry->lock);
 604
 605                 ret = of_property_read_string(node, "qcom,entry-name", &entry->name);
 606                 if (ret < 0)
 607                         goto unwind_interfaces;
 608
 609                 if (of_property_read_bool(node, "interrupt-controller")) {
 610                         ret = qcom_smp2p_inbound_entry(smp2p, entry, node);
 611                         if (ret < 0)
 612                                 goto unwind_interfaces;
 613
 614                         list_add(&entry->node, &smp2p->inbound);
 615                 } else  {
 616                         ret = qcom_smp2p_outbound_entry(smp2p, entry, node);
 617                         if (ret < 0)
 618                                 goto unwind_interfaces;
 619
 620                         list_add(&entry->node, &smp2p->outbound);
 621                 }
 622         }
 623
 624         /* Kick the outgoing edge after allocating entries */
 625         qcom_smp2p_kick(smp2p);
 626
 627         ret = devm_request_threaded_irq(&pdev->dev, irq,
 628                                         NULL, qcom_smp2p_intr,
 629                                         IRQF_ONESHOT,
 630                                         NULL, (void *)smp2p);
 631         if (ret) {
 632                 dev_err(&pdev->dev, "failed to request interrupt\n");
 633                 goto unwind_interfaces;
 634         }
 635
 636         /*
 637          * Treat smp2p interrupt as wakeup source, but keep it disabled
 638          * by default. User space can decide enabling it depending on its
 639          * use cases. For example if remoteproc crashes and device wants
 640          * to handle it immediatedly (e.g. to not miss phone calls) it can
 641          * enable wakeup source from user space, while other devices which
 642          * do not have proper autosleep feature may want to handle it with
 643          * other wakeup events (e.g. Power button) instead waking up immediately.
 644          */
 645         device_set_wakeup_capable(&pdev->dev, true);
 646
 647         ret = dev_pm_set_wake_irq(&pdev->dev, irq);
 648         if (ret)
 649                 goto set_wake_irq_fail;
 650
 651         return 0;
 652
 653 set_wake_irq_fail:
 654         dev_pm_clear_wake_irq(&pdev->dev);
 655
 656 unwind_interfaces:
 657         list_for_each_entry(entry, &smp2p->inbound, node)
 658                 irq_domain_remove(entry->domain);
 659
 660         list_for_each_entry(entry, &smp2p->outbound, node)
 661                 qcom_smem_state_unregister(entry->state);
 662
 663         smp2p->out->valid_entries = 0;
 664
 665 release_mbox:
 666         mbox_free_channel(smp2p->mbox_chan);
 667
 668         return ret;
 669
 670 report_read_failure:
 671         dev_err(&pdev->dev, "failed to read %s\n", key);
 672         return -EINVAL;
 673 }
 674
 675 static void qcom_smp2p_remove(struct platform_device *pdev)
 676 {
 677         struct qcom_smp2p *smp2p = platform_get_drvdata(pdev);
 678         struct smp2p_entry *entry;
 679
 680         dev_pm_clear_wake_irq(&pdev->dev);
 681
 682         list_for_each_entry(entry, &smp2p->inbound, node)
 683                 irq_domain_remove(entry->domain);
 684
 685         list_for_each_entry(entry, &smp2p->outbound, node)
 686                 qcom_smem_state_unregister(entry->state);
 687
 688         mbox_free_channel(smp2p->mbox_chan);
 689
 690         smp2p->out->valid_entries = 0;
 691 }
 692
 693 static const struct of_device_id qcom_smp2p_of_match[] = {
 694         { .compatible = "qcom,smp2p" },
 695         {}
 696 };
 697 MODULE_DEVICE_TABLE(of, qcom_smp2p_of_match);
 698
 699 static struct platform_driver qcom_smp2p_driver = {
 700         .probe = qcom_smp2p_probe,
 701         .remove_new = qcom_smp2p_remove,
 702         .driver  = {
 703                 .name  = "qcom_smp2p",
 704                 .of_match_table = qcom_smp2p_of_match,
 705         },
 706 };
 707 module_platform_driver(qcom_smp2p_driver);
 708
 709 MODULE_DESCRIPTION("Qualcomm Shared Memory Point to Point driver");
 710 MODULE_LICENSE("GPL v2");