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