drivers/remoteproc/stm32_rproc.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (C) STMicroelectronics 2018 - All Rights Reserved
   4  * Authors: Ludovic Barre <ludovic.barre@st.com> for STMicroelectronics.
   5  *          Fabien Dessenne <fabien.dessenne@st.com> for STMicroelectronics.
   6  */
   7
   8 #include <linux/arm-smccc.h>
   9 #include <linux/dma-mapping.h>
  10 #include <linux/interrupt.h>
  11 #include <linux/io.h>
  12 #include <linux/mailbox_client.h>
  13 #include <linux/mfd/syscon.h>
  14 #include <linux/module.h>
  15 #include <linux/of_address.h>
  16 #include <linux/of_device.h>
  17 #include <linux/of_reserved_mem.h>
  18 #include <linux/pm_wakeirq.h>
  19 #include <linux/regmap.h>
  20 #include <linux/remoteproc.h>
  21 #include <linux/reset.h>
  22 #include <linux/slab.h>
  23 #include <linux/workqueue.h>
  24
  25 #include "remoteproc_internal.h"
  26
  27 #define HOLD_BOOT               0
  28 #define RELEASE_BOOT            1
  29
  30 #define MBOX_NB_VQ              2
  31 #define MBOX_NB_MBX             3
  32
  33 #define STM32_SMC_RCC           0x82001000
  34 #define STM32_SMC_REG_WRITE     0x1
  35
  36 #define STM32_MBX_VQ0           "vq0"
  37 #define STM32_MBX_VQ0_ID        0
  38 #define STM32_MBX_VQ1           "vq1"
  39 #define STM32_MBX_VQ1_ID        1
  40 #define STM32_MBX_SHUTDOWN      "shutdown"
  41
  42 struct stm32_syscon {
  43         struct regmap *map;
  44         u32 reg;
  45         u32 mask;
  46 };
  47
  48 struct stm32_rproc_mem {
  49         char name[20];
  50         void __iomem *cpu_addr;
  51         phys_addr_t bus_addr;
  52         u32 dev_addr;
  53         size_t size;
  54 };
  55
  56 struct stm32_rproc_mem_ranges {
  57         u32 dev_addr;
  58         u32 bus_addr;
  59         u32 size;
  60 };
  61
  62 struct stm32_mbox {
  63         const unsigned char name[10];
  64         struct mbox_chan *chan;
  65         struct mbox_client client;
  66         struct work_struct vq_work;
  67         int vq_id;
  68 };
  69
  70 struct stm32_rproc {
  71         struct reset_control *rst;
  72         struct stm32_syscon hold_boot;
  73         struct stm32_syscon pdds;
  74         int wdg_irq;
  75         u32 nb_rmems;
  76         struct stm32_rproc_mem *rmems;
  77         struct stm32_mbox mb[MBOX_NB_MBX];
  78         struct workqueue_struct *workqueue;
  79         bool secured_soc;
  80 };
  81
  82 static int stm32_rproc_pa_to_da(struct rproc *rproc, phys_addr_t pa, u64 *da)
  83 {
  84         unsigned int i;
  85         struct stm32_rproc *ddata = rproc->priv;
  86         struct stm32_rproc_mem *p_mem;
  87
  88         for (i = 0; i < ddata->nb_rmems; i++) {
  89                 p_mem = &ddata->rmems[i];
  90
  91                 if (pa < p_mem->bus_addr ||
  92                     pa >= p_mem->bus_addr + p_mem->size)
  93                         continue;
  94                 *da = pa - p_mem->bus_addr + p_mem->dev_addr;
  95                 dev_dbg(rproc->dev.parent, "pa %pa to da %llx\n", &pa, *da);
  96                 return 0;
  97         }
  98
  99         return -EINVAL;
 100 }
 101
 102 static int stm32_rproc_mem_alloc(struct rproc *rproc,
 103                                  struct rproc_mem_entry *mem)
 104 {
 105         struct device *dev = rproc->dev.parent;
 106         void *va;
 107
 108         dev_dbg(dev, "map memory: %pa+%x\n", &mem->dma, mem->len);
 109         va = ioremap_wc(mem->dma, mem->len);
 110         if (IS_ERR_OR_NULL(va)) {
 111                 dev_err(dev, "Unable to map memory region: %pa+%x\n",
 112                         &mem->dma, mem->len);
 113                 return -ENOMEM;
 114         }
 115
 116         /* Update memory entry va */
 117         mem->va = va;
 118
 119         return 0;
 120 }
 121
 122 static int stm32_rproc_mem_release(struct rproc *rproc,
 123                                    struct rproc_mem_entry *mem)
 124 {
 125         dev_dbg(rproc->dev.parent, "unmap memory: %pa\n", &mem->dma);
 126         iounmap(mem->va);
 127
 128         return 0;
 129 }
 130
 131 static int stm32_rproc_of_memory_translations(struct rproc *rproc)
 132 {
 133         struct device *parent, *dev = rproc->dev.parent;
 134         struct stm32_rproc *ddata = rproc->priv;
 135         struct device_node *np;
 136         struct stm32_rproc_mem *p_mems;
 137         struct stm32_rproc_mem_ranges *mem_range;
 138         int cnt, array_size, i, ret = 0;
 139
 140         parent = dev->parent;
 141         np = parent->of_node;
 142
 143         cnt = of_property_count_elems_of_size(np, "dma-ranges",
 144                                               sizeof(*mem_range));
 145         if (cnt <= 0) {
 146                 dev_err(dev, "%s: dma-ranges property not defined\n", __func__);
 147                 return -EINVAL;
 148         }
 149
 150         p_mems = devm_kcalloc(dev, cnt, sizeof(*p_mems), GFP_KERNEL);
 151         if (!p_mems)
 152                 return -ENOMEM;
 153         mem_range = kcalloc(cnt, sizeof(*mem_range), GFP_KERNEL);
 154         if (!mem_range)
 155                 return -ENOMEM;
 156
 157         array_size = cnt * sizeof(struct stm32_rproc_mem_ranges) / sizeof(u32);
 158
 159         ret = of_property_read_u32_array(np, "dma-ranges",
 160                                          (u32 *)mem_range, array_size);
 161         if (ret) {
 162                 dev_err(dev, "error while get dma-ranges property: %x\n", ret);
 163                 goto free_mem;
 164         }
 165
 166         for (i = 0; i < cnt; i++) {
 167                 p_mems[i].bus_addr = mem_range[i].bus_addr;
 168                 p_mems[i].dev_addr = mem_range[i].dev_addr;
 169                 p_mems[i].size     = mem_range[i].size;
 170
 171                 dev_dbg(dev, "memory range[%i]: da %#x, pa %pa, size %#zx:\n",
 172                         i, p_mems[i].dev_addr, &p_mems[i].bus_addr,
 173                         p_mems[i].size);
 174         }
 175
 176         ddata->rmems = p_mems;
 177         ddata->nb_rmems = cnt;
 178
 179 free_mem:
 180         kfree(mem_range);
 181         return ret;
 182 }
 183
 184 static int stm32_rproc_mbox_idx(struct rproc *rproc, const unsigned char *name)
 185 {
 186         struct stm32_rproc *ddata = rproc->priv;
 187         int i;
 188
 189         for (i = 0; i < ARRAY_SIZE(ddata->mb); i++) {
 190                 if (!strncmp(ddata->mb[i].name, name, strlen(name)))
 191                         return i;
 192         }
 193         dev_err(&rproc->dev, "mailbox %s not found\n", name);
 194
 195         return -EINVAL;
 196 }
 197
 198 static int stm32_rproc_elf_load_rsc_table(struct rproc *rproc,
 199                                           const struct firmware *fw)
 200 {
 201         if (rproc_elf_load_rsc_table(rproc, fw))
 202                 dev_warn(&rproc->dev, "no resource table found for this firmware\n");
 203
 204         return 0;
 205 }
 206
 207 static int stm32_rproc_parse_fw(struct rproc *rproc, const struct firmware *fw)
 208 {
 209         struct device *dev = rproc->dev.parent;
 210         struct device_node *np = dev->of_node;
 211         struct of_phandle_iterator it;
 212         struct rproc_mem_entry *mem;
 213         struct reserved_mem *rmem;
 214         u64 da;
 215         int index = 0;
 216
 217         /* Register associated reserved memory regions */
 218         of_phandle_iterator_init(&it, np, "memory-region", NULL, 0);
 219         while (of_phandle_iterator_next(&it) == 0) {
 220                 rmem = of_reserved_mem_lookup(it.node);
 221                 if (!rmem) {
 222                         dev_err(dev, "unable to acquire memory-region\n");
 223                         return -EINVAL;
 224                 }
 225
 226                 if (stm32_rproc_pa_to_da(rproc, rmem->base, &da) < 0) {
 227                         dev_err(dev, "memory region not valid %pa\n",
 228                                 &rmem->base);
 229                         return -EINVAL;
 230                 }
 231
 232                 /*  No need to map vdev buffer */
 233                 if (strcmp(it.node->name, "vdev0buffer")) {
 234                         /* Register memory region */
 235                         mem = rproc_mem_entry_init(dev, NULL,
 236                                                    (dma_addr_t)rmem->base,
 237                                                    rmem->size, da,
 238                                                    stm32_rproc_mem_alloc,
 239                                                    stm32_rproc_mem_release,
 240                                                    it.node->name);
 241
 242                         if (mem)
 243                                 rproc_coredump_add_segment(rproc, da,
 244                                                            rmem->size);
 245                 } else {
 246                         /* Register reserved memory for vdev buffer alloc */
 247                         mem = rproc_of_resm_mem_entry_init(dev, index,
 248                                                            rmem->size,
 249                                                            rmem->base,
 250                                                            it.node->name);
 251                 }
 252
 253                 if (!mem)
 254                         return -ENOMEM;
 255
 256                 rproc_add_carveout(rproc, mem);
 257                 index++;
 258         }
 259
 260         return stm32_rproc_elf_load_rsc_table(rproc, fw);
 261 }
 262
 263 static irqreturn_t stm32_rproc_wdg(int irq, void *data)
 264 {
 265         struct rproc *rproc = data;
 266
 267         rproc_report_crash(rproc, RPROC_WATCHDOG);
 268
 269         return IRQ_HANDLED;
 270 }
 271
 272 static void stm32_rproc_mb_vq_work(struct work_struct *work)
 273 {
 274         struct stm32_mbox *mb = container_of(work, struct stm32_mbox, vq_work);
 275         struct rproc *rproc = dev_get_drvdata(mb->client.dev);
 276
 277         if (rproc_vq_interrupt(rproc, mb->vq_id) == IRQ_NONE)
 278                 dev_dbg(&rproc->dev, "no message found in vq%d\n", mb->vq_id);
 279 }
 280
 281 static void stm32_rproc_mb_callback(struct mbox_client *cl, void *data)
 282 {
 283         struct rproc *rproc = dev_get_drvdata(cl->dev);
 284         struct stm32_mbox *mb = container_of(cl, struct stm32_mbox, client);
 285         struct stm32_rproc *ddata = rproc->priv;
 286
 287         queue_work(ddata->workqueue, &mb->vq_work);
 288 }
 289
 290 static void stm32_rproc_free_mbox(struct rproc *rproc)
 291 {
 292         struct stm32_rproc *ddata = rproc->priv;
 293         unsigned int i;
 294
 295         for (i = 0; i < ARRAY_SIZE(ddata->mb); i++) {
 296                 if (ddata->mb[i].chan)
 297                         mbox_free_channel(ddata->mb[i].chan);
 298                 ddata->mb[i].chan = NULL;
 299         }
 300 }
 301
 302 static const struct stm32_mbox stm32_rproc_mbox[MBOX_NB_MBX] = {
 303         {
 304                 .name = STM32_MBX_VQ0,
 305                 .vq_id = STM32_MBX_VQ0_ID,
 306                 .client = {
 307                         .rx_callback = stm32_rproc_mb_callback,
 308                         .tx_block = false,
 309                 },
 310         },
 311         {
 312                 .name = STM32_MBX_VQ1,
 313                 .vq_id = STM32_MBX_VQ1_ID,
 314                 .client = {
 315                         .rx_callback = stm32_rproc_mb_callback,
 316                         .tx_block = false,
 317                 },
 318         },
 319         {
 320                 .name = STM32_MBX_SHUTDOWN,
 321                 .vq_id = -1,
 322                 .client = {
 323                         .tx_block = true,
 324                         .tx_done = NULL,
 325                         .tx_tout = 500, /* 500 ms time out */
 326                 },
 327         }
 328 };
 329
 330 static int stm32_rproc_request_mbox(struct rproc *rproc)
 331 {
 332         struct stm32_rproc *ddata = rproc->priv;
 333         struct device *dev = &rproc->dev;
 334         unsigned int i;
 335         int j;
 336         const unsigned char *name;
 337         struct mbox_client *cl;
 338
 339         /* Initialise mailbox structure table */
 340         memcpy(ddata->mb, stm32_rproc_mbox, sizeof(stm32_rproc_mbox));
 341
 342         for (i = 0; i < MBOX_NB_MBX; i++) {
 343                 name = ddata->mb[i].name;
 344
 345                 cl = &ddata->mb[i].client;
 346                 cl->dev = dev->parent;
 347
 348                 ddata->mb[i].chan = mbox_request_channel_byname(cl, name);
 349                 if (IS_ERR(ddata->mb[i].chan)) {
 350                         if (PTR_ERR(ddata->mb[i].chan) == -EPROBE_DEFER)
 351                                 goto err_probe;
 352                         dev_warn(dev, "cannot get %s mbox\n", name);
 353                         ddata->mb[i].chan = NULL;
 354                 }
 355                 if (ddata->mb[i].vq_id >= 0) {
 356                         INIT_WORK(&ddata->mb[i].vq_work,
 357                                   stm32_rproc_mb_vq_work);
 358                 }
 359         }
 360
 361         return 0;
 362
 363 err_probe:
 364         for (j = i - 1; j >= 0; j--)
 365                 if (ddata->mb[j].chan)
 366                         mbox_free_channel(ddata->mb[j].chan);
 367         return -EPROBE_DEFER;
 368 }
 369
 370 static int stm32_rproc_set_hold_boot(struct rproc *rproc, bool hold)
 371 {
 372         struct stm32_rproc *ddata = rproc->priv;
 373         struct stm32_syscon hold_boot = ddata->hold_boot;
 374         struct arm_smccc_res smc_res;
 375         int val, err;
 376
 377         val = hold ? HOLD_BOOT : RELEASE_BOOT;
 378
 379         if (IS_ENABLED(CONFIG_HAVE_ARM_SMCCC) && ddata->secured_soc) {
 380                 arm_smccc_smc(STM32_SMC_RCC, STM32_SMC_REG_WRITE,
 381                               hold_boot.reg, val, 0, 0, 0, 0, &smc_res);
 382                 err = smc_res.a0;
 383         } else {
 384                 err = regmap_update_bits(hold_boot.map, hold_boot.reg,
 385                                          hold_boot.mask, val);
 386         }
 387
 388         if (err)
 389                 dev_err(&rproc->dev, "failed to set hold boot\n");
 390
 391         return err;
 392 }
 393
 394 static void stm32_rproc_add_coredump_trace(struct rproc *rproc)
 395 {
 396         struct rproc_debug_trace *trace;
 397         struct rproc_dump_segment *segment;
 398         bool already_added;
 399
 400         list_for_each_entry(trace, &rproc->traces, node) {
 401                 already_added = false;
 402
 403                 list_for_each_entry(segment, &rproc->dump_segments, node) {
 404                         if (segment->da == trace->trace_mem.da) {
 405                                 already_added = true;
 406                                 break;
 407                         }
 408                 }
 409
 410                 if (!already_added)
 411                         rproc_coredump_add_segment(rproc, trace->trace_mem.da,
 412                                                    trace->trace_mem.len);
 413         }
 414 }
 415
 416 static int stm32_rproc_start(struct rproc *rproc)
 417 {
 418         struct stm32_rproc *ddata = rproc->priv;
 419         int err;
 420
 421         stm32_rproc_add_coredump_trace(rproc);
 422
 423         /* clear remote proc Deep Sleep */
 424         if (ddata->pdds.map) {
 425                 err = regmap_update_bits(ddata->pdds.map, ddata->pdds.reg,
 426                                          ddata->pdds.mask, 0);
 427                 if (err) {
 428                         dev_err(&rproc->dev, "failed to clear pdds\n");
 429                         return err;
 430                 }
 431         }
 432
 433         err = stm32_rproc_set_hold_boot(rproc, false);
 434         if (err)
 435                 return err;
 436
 437         return stm32_rproc_set_hold_boot(rproc, true);
 438 }
 439
 440 static int stm32_rproc_stop(struct rproc *rproc)
 441 {
 442         struct stm32_rproc *ddata = rproc->priv;
 443         int err, dummy_data, idx;
 444
 445         /* request shutdown of the remote processor */
 446         if (rproc->state != RPROC_OFFLINE) {
 447                 idx = stm32_rproc_mbox_idx(rproc, STM32_MBX_SHUTDOWN);
 448                 if (idx >= 0 && ddata->mb[idx].chan) {
 449                         /* a dummy data is sent to allow to block on transmit */
 450                         err = mbox_send_message(ddata->mb[idx].chan,
 451                                                 &dummy_data);
 452                         if (err < 0)
 453                                 dev_warn(&rproc->dev, "warning: remote FW shutdown without ack\n");
 454                 }
 455         }
 456
 457         err = stm32_rproc_set_hold_boot(rproc, true);
 458         if (err)
 459                 return err;
 460
 461         err = reset_control_assert(ddata->rst);
 462         if (err) {
 463                 dev_err(&rproc->dev, "failed to assert the reset\n");
 464                 return err;
 465         }
 466
 467         /* to allow platform Standby power mode, set remote proc Deep Sleep */
 468         if (ddata->pdds.map) {
 469                 err = regmap_update_bits(ddata->pdds.map, ddata->pdds.reg,
 470                                          ddata->pdds.mask, 1);
 471                 if (err) {
 472                         dev_err(&rproc->dev, "failed to set pdds\n");
 473                         return err;
 474                 }
 475         }
 476
 477         return 0;
 478 }
 479
 480 static void stm32_rproc_kick(struct rproc *rproc, int vqid)
 481 {
 482         struct stm32_rproc *ddata = rproc->priv;
 483         unsigned int i;
 484         int err;
 485
 486         if (WARN_ON(vqid >= MBOX_NB_VQ))
 487                 return;
 488
 489         for (i = 0; i < MBOX_NB_MBX; i++) {
 490                 if (vqid != ddata->mb[i].vq_id)
 491                         continue;
 492                 if (!ddata->mb[i].chan)
 493                         return;
 494                 err = mbox_send_message(ddata->mb[i].chan, (void *)(long)vqid);
 495                 if (err < 0)
 496                         dev_err(&rproc->dev, "%s: failed (%s, err:%d)\n",
 497                                 __func__, ddata->mb[i].name, err);
 498                 return;
 499         }
 500 }
 501
 502 static struct rproc_ops st_rproc_ops = {
 503         .start          = stm32_rproc_start,
 504         .stop           = stm32_rproc_stop,
 505         .kick           = stm32_rproc_kick,
 506         .load           = rproc_elf_load_segments,
 507         .parse_fw       = stm32_rproc_parse_fw,
 508         .find_loaded_rsc_table = rproc_elf_find_loaded_rsc_table,
 509         .sanity_check   = rproc_elf32_sanity_check,
 510         .get_boot_addr  = rproc_elf_get_boot_addr,
 511 };
 512
 513 static const struct of_device_id stm32_rproc_match[] = {
 514         { .compatible = "st,stm32mp1-m4" },
 515         {},
 516 };
 517 MODULE_DEVICE_TABLE(of, stm32_rproc_match);
 518
 519 static int stm32_rproc_get_syscon(struct device_node *np, const char *prop,
 520                                   struct stm32_syscon *syscon)
 521 {
 522         int err = 0;
 523
 524         syscon->map = syscon_regmap_lookup_by_phandle(np, prop);
 525         if (IS_ERR(syscon->map)) {
 526                 err = PTR_ERR(syscon->map);
 527                 syscon->map = NULL;
 528                 goto out;
 529         }
 530
 531         err = of_property_read_u32_index(np, prop, 1, &syscon->reg);
 532         if (err)
 533                 goto out;
 534
 535         err = of_property_read_u32_index(np, prop, 2, &syscon->mask);
 536
 537 out:
 538         return err;
 539 }
 540
 541 static int stm32_rproc_parse_dt(struct platform_device *pdev)
 542 {
 543         struct device *dev = &pdev->dev;
 544         struct device_node *np = dev->of_node;
 545         struct rproc *rproc = platform_get_drvdata(pdev);
 546         struct stm32_rproc *ddata = rproc->priv;
 547         struct stm32_syscon tz;
 548         unsigned int tzen;
 549         int err, irq;
 550
 551         irq = platform_get_irq(pdev, 0);
 552         if (irq == -EPROBE_DEFER)
 553                 return -EPROBE_DEFER;
 554
 555         if (irq > 0) {
 556                 err = devm_request_irq(dev, irq, stm32_rproc_wdg, 0,
 557                                        dev_name(dev), rproc);
 558                 if (err) {
 559                         dev_err(dev, "failed to request wdg irq\n");
 560                         return err;
 561                 }
 562
 563                 ddata->wdg_irq = irq;
 564
 565                 if (of_property_read_bool(np, "wakeup-source")) {
 566                         device_init_wakeup(dev, true);
 567                         dev_pm_set_wake_irq(dev, irq);
 568                 }
 569
 570                 dev_info(dev, "wdg irq registered\n");
 571         }
 572
 573         ddata->rst = devm_reset_control_get_by_index(dev, 0);
 574         if (IS_ERR(ddata->rst)) {
 575                 dev_err(dev, "failed to get mcu reset\n");
 576                 return PTR_ERR(ddata->rst);
 577         }
 578
 579         /*
 580          * if platform is secured the hold boot bit must be written by
 581          * smc call and read normally.
 582          * if not secure the hold boot bit could be read/write normally
 583          */
 584         err = stm32_rproc_get_syscon(np, "st,syscfg-tz", &tz);
 585         if (err) {
 586                 dev_err(dev, "failed to get tz syscfg\n");
 587                 return err;
 588         }
 589
 590         err = regmap_read(tz.map, tz.reg, &tzen);
 591         if (err) {
 592                 dev_err(&rproc->dev, "failed to read tzen\n");
 593                 return err;
 594         }
 595         ddata->secured_soc = tzen & tz.mask;
 596
 597         err = stm32_rproc_get_syscon(np, "st,syscfg-holdboot",
 598                                      &ddata->hold_boot);
 599         if (err) {
 600                 dev_err(dev, "failed to get hold boot\n");
 601                 return err;
 602         }
 603
 604         err = stm32_rproc_get_syscon(np, "st,syscfg-pdds", &ddata->pdds);
 605         if (err)
 606                 dev_info(dev, "failed to get pdds\n");
 607
 608         rproc->auto_boot = of_property_read_bool(np, "st,auto-boot");
 609
 610         return stm32_rproc_of_memory_translations(rproc);
 611 }
 612
 613 static int stm32_rproc_probe(struct platform_device *pdev)
 614 {
 615         struct device *dev = &pdev->dev;
 616         struct stm32_rproc *ddata;
 617         struct device_node *np = dev->of_node;
 618         struct rproc *rproc;
 619         int ret;
 620
 621         ret = dma_coerce_mask_and_coherent(dev, DMA_BIT_MASK(32));
 622         if (ret)
 623                 return ret;
 624
 625         rproc = rproc_alloc(dev, np->name, &st_rproc_ops, NULL, sizeof(*ddata));
 626         if (!rproc)
 627                 return -ENOMEM;
 628
 629         rproc->has_iommu = false;
 630         ddata = rproc->priv;
 631         ddata->workqueue = create_workqueue(dev_name(dev));
 632         if (!ddata->workqueue) {
 633                 dev_err(dev, "cannot create workqueue\n");
 634                 ret = -ENOMEM;
 635                 goto free_rproc;
 636         }
 637
 638         platform_set_drvdata(pdev, rproc);
 639
 640         ret = stm32_rproc_parse_dt(pdev);
 641         if (ret)
 642                 goto free_wkq;
 643
 644         ret = stm32_rproc_request_mbox(rproc);
 645         if (ret)
 646                 goto free_rproc;
 647
 648         ret = rproc_add(rproc);
 649         if (ret)
 650                 goto free_mb;
 651
 652         return 0;
 653
 654 free_mb:
 655         stm32_rproc_free_mbox(rproc);
 656 free_wkq:
 657         destroy_workqueue(ddata->workqueue);
 658 free_rproc:
 659         if (device_may_wakeup(dev)) {
 660                 dev_pm_clear_wake_irq(dev);
 661                 device_init_wakeup(dev, false);
 662         }
 663         rproc_free(rproc);
 664         return ret;
 665 }
 666
 667 static int stm32_rproc_remove(struct platform_device *pdev)
 668 {
 669         struct rproc *rproc = platform_get_drvdata(pdev);
 670         struct stm32_rproc *ddata = rproc->priv;
 671         struct device *dev = &pdev->dev;
 672
 673         if (atomic_read(&rproc->power) > 0)
 674                 rproc_shutdown(rproc);
 675
 676         rproc_del(rproc);
 677         stm32_rproc_free_mbox(rproc);
 678         destroy_workqueue(ddata->workqueue);
 679
 680         if (device_may_wakeup(dev)) {
 681                 dev_pm_clear_wake_irq(dev);
 682                 device_init_wakeup(dev, false);
 683         }
 684         rproc_free(rproc);
 685
 686         return 0;
 687 }
 688
 689 static int __maybe_unused stm32_rproc_suspend(struct device *dev)
 690 {
 691         struct rproc *rproc = dev_get_drvdata(dev);
 692         struct stm32_rproc *ddata = rproc->priv;
 693
 694         if (device_may_wakeup(dev))
 695                 return enable_irq_wake(ddata->wdg_irq);
 696
 697         return 0;
 698 }
 699
 700 static int __maybe_unused stm32_rproc_resume(struct device *dev)
 701 {
 702         struct rproc *rproc = dev_get_drvdata(dev);
 703         struct stm32_rproc *ddata = rproc->priv;
 704
 705         if (device_may_wakeup(dev))
 706                 return disable_irq_wake(ddata->wdg_irq);
 707
 708         return 0;
 709 }
 710
 711 static SIMPLE_DEV_PM_OPS(stm32_rproc_pm_ops,
 712                          stm32_rproc_suspend, stm32_rproc_resume);
 713
 714 static struct platform_driver stm32_rproc_driver = {
 715         .probe = stm32_rproc_probe,
 716         .remove = stm32_rproc_remove,
 717         .driver = {
 718                 .name = "stm32-rproc",
 719                 .pm = &stm32_rproc_pm_ops,
 720                 .of_match_table = of_match_ptr(stm32_rproc_match),
 721         },
 722 };
 723 module_platform_driver(stm32_rproc_driver);
 724
 725 MODULE_DESCRIPTION("STM32 Remote Processor Control Driver");
 726 MODULE_AUTHOR("Ludovic Barre <ludovic.barre@st.com>");
 727 MODULE_AUTHOR("Fabien Dessenne <fabien.dessenne@st.com>");
 728 MODULE_LICENSE("GPL v2");
 729