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             4
  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 #define STM32_MBX_DETACH        "detach"
  42
  43 #define RSC_TBL_SIZE            1024
  44
  45 #define M4_STATE_OFF            0
  46 #define M4_STATE_INI            1
  47 #define M4_STATE_CRUN           2
  48 #define M4_STATE_CSTOP          3
  49 #define M4_STATE_STANDBY        4
  50 #define M4_STATE_CRASH          5
  51
  52 struct stm32_syscon {
  53         struct regmap *map;
  54         u32 reg;
  55         u32 mask;
  56 };
  57
  58 struct stm32_rproc_mem {
  59         char name[20];
  60         void __iomem *cpu_addr;
  61         phys_addr_t bus_addr;
  62         u32 dev_addr;
  63         size_t size;
  64 };
  65
  66 struct stm32_rproc_mem_ranges {
  67         u32 dev_addr;
  68         u32 bus_addr;
  69         u32 size;
  70 };
  71
  72 struct stm32_mbox {
  73         const unsigned char name[10];
  74         struct mbox_chan *chan;
  75         struct mbox_client client;
  76         struct work_struct vq_work;
  77         int vq_id;
  78 };
  79
  80 struct stm32_rproc {
  81         struct reset_control *rst;
  82         struct stm32_syscon hold_boot;
  83         struct stm32_syscon pdds;
  84         struct stm32_syscon m4_state;
  85         struct stm32_syscon rsctbl;
  86         int wdg_irq;
  87         u32 nb_rmems;
  88         struct stm32_rproc_mem *rmems;
  89         struct stm32_mbox mb[MBOX_NB_MBX];
  90         struct workqueue_struct *workqueue;
  91         bool secured_soc;
  92         void __iomem *rsc_va;
  93 };
  94
  95 static int stm32_rproc_pa_to_da(struct rproc *rproc, phys_addr_t pa, u64 *da)
  96 {
  97         unsigned int i;
  98         struct stm32_rproc *ddata = rproc->priv;
  99         struct stm32_rproc_mem *p_mem;
 100
 101         for (i = 0; i < ddata->nb_rmems; i++) {
 102                 p_mem = &ddata->rmems[i];
 103
 104                 if (pa < p_mem->bus_addr ||
 105                     pa >= p_mem->bus_addr + p_mem->size)
 106                         continue;
 107                 *da = pa - p_mem->bus_addr + p_mem->dev_addr;
 108                 dev_dbg(rproc->dev.parent, "pa %pa to da %llx\n", &pa, *da);
 109                 return 0;
 110         }
 111
 112         return -EINVAL;
 113 }
 114
 115 static int stm32_rproc_mem_alloc(struct rproc *rproc,
 116                                  struct rproc_mem_entry *mem)
 117 {
 118         struct device *dev = rproc->dev.parent;
 119         void *va;
 120
 121         dev_dbg(dev, "map memory: %pa+%x\n", &mem->dma, mem->len);
 122         va = ioremap_wc(mem->dma, mem->len);
 123         if (IS_ERR_OR_NULL(va)) {
 124                 dev_err(dev, "Unable to map memory region: %pa+%x\n",
 125                         &mem->dma, mem->len);
 126                 return -ENOMEM;
 127         }
 128
 129         /* Update memory entry va */
 130         mem->va = va;
 131
 132         return 0;
 133 }
 134
 135 static int stm32_rproc_mem_release(struct rproc *rproc,
 136                                    struct rproc_mem_entry *mem)
 137 {
 138         dev_dbg(rproc->dev.parent, "unmap memory: %pa\n", &mem->dma);
 139         iounmap(mem->va);
 140
 141         return 0;
 142 }
 143
 144 static int stm32_rproc_of_memory_translations(struct platform_device *pdev,
 145                                               struct stm32_rproc *ddata)
 146 {
 147         struct device *parent, *dev = &pdev->dev;
 148         struct device_node *np;
 149         struct stm32_rproc_mem *p_mems;
 150         struct stm32_rproc_mem_ranges *mem_range;
 151         int cnt, array_size, i, ret = 0;
 152
 153         parent = dev->parent;
 154         np = parent->of_node;
 155
 156         cnt = of_property_count_elems_of_size(np, "dma-ranges",
 157                                               sizeof(*mem_range));
 158         if (cnt <= 0) {
 159                 dev_err(dev, "%s: dma-ranges property not defined\n", __func__);
 160                 return -EINVAL;
 161         }
 162
 163         p_mems = devm_kcalloc(dev, cnt, sizeof(*p_mems), GFP_KERNEL);
 164         if (!p_mems)
 165                 return -ENOMEM;
 166         mem_range = kcalloc(cnt, sizeof(*mem_range), GFP_KERNEL);
 167         if (!mem_range)
 168                 return -ENOMEM;
 169
 170         array_size = cnt * sizeof(struct stm32_rproc_mem_ranges) / sizeof(u32);
 171
 172         ret = of_property_read_u32_array(np, "dma-ranges",
 173                                          (u32 *)mem_range, array_size);
 174         if (ret) {
 175                 dev_err(dev, "error while get dma-ranges property: %x\n", ret);
 176                 goto free_mem;
 177         }
 178
 179         for (i = 0; i < cnt; i++) {
 180                 p_mems[i].bus_addr = mem_range[i].bus_addr;
 181                 p_mems[i].dev_addr = mem_range[i].dev_addr;
 182                 p_mems[i].size     = mem_range[i].size;
 183
 184                 dev_dbg(dev, "memory range[%i]: da %#x, pa %pa, size %#zx:\n",
 185                         i, p_mems[i].dev_addr, &p_mems[i].bus_addr,
 186                         p_mems[i].size);
 187         }
 188
 189         ddata->rmems = p_mems;
 190         ddata->nb_rmems = cnt;
 191
 192 free_mem:
 193         kfree(mem_range);
 194         return ret;
 195 }
 196
 197 static int stm32_rproc_mbox_idx(struct rproc *rproc, const unsigned char *name)
 198 {
 199         struct stm32_rproc *ddata = rproc->priv;
 200         int i;
 201
 202         for (i = 0; i < ARRAY_SIZE(ddata->mb); i++) {
 203                 if (!strncmp(ddata->mb[i].name, name, strlen(name)))
 204                         return i;
 205         }
 206         dev_err(&rproc->dev, "mailbox %s not found\n", name);
 207
 208         return -EINVAL;
 209 }
 210
 211 static int stm32_rproc_prepare(struct rproc *rproc)
 212 {
 213         struct device *dev = rproc->dev.parent;
 214         struct device_node *np = dev->of_node;
 215         struct of_phandle_iterator it;
 216         struct rproc_mem_entry *mem;
 217         struct reserved_mem *rmem;
 218         u64 da;
 219         int index = 0;
 220
 221         /* Register associated reserved memory regions */
 222         of_phandle_iterator_init(&it, np, "memory-region", NULL, 0);
 223         while (of_phandle_iterator_next(&it) == 0) {
 224                 rmem = of_reserved_mem_lookup(it.node);
 225                 if (!rmem) {
 226                         dev_err(dev, "unable to acquire memory-region\n");
 227                         return -EINVAL;
 228                 }
 229
 230                 if (stm32_rproc_pa_to_da(rproc, rmem->base, &da) < 0) {
 231                         dev_err(dev, "memory region not valid %pa\n",
 232                                 &rmem->base);
 233                         return -EINVAL;
 234                 }
 235
 236                 /*  No need to map vdev buffer */
 237                 if (strcmp(it.node->name, "vdev0buffer")) {
 238                         /* Register memory region */
 239                         mem = rproc_mem_entry_init(dev, NULL,
 240                                                    (dma_addr_t)rmem->base,
 241                                                    rmem->size, da,
 242                                                    stm32_rproc_mem_alloc,
 243                                                    stm32_rproc_mem_release,
 244                                                    it.node->name);
 245
 246                         if (mem)
 247                                 rproc_coredump_add_segment(rproc, da,
 248                                                            rmem->size);
 249                 } else {
 250                         /* Register reserved memory for vdev buffer alloc */
 251                         mem = rproc_of_resm_mem_entry_init(dev, index,
 252                                                            rmem->size,
 253                                                            rmem->base,
 254                                                            it.node->name);
 255                 }
 256
 257                 if (!mem)
 258                         return -ENOMEM;
 259
 260                 rproc_add_carveout(rproc, mem);
 261                 index++;
 262         }
 263
 264         return 0;
 265 }
 266
 267 static int stm32_rproc_parse_fw(struct rproc *rproc, const struct firmware *fw)
 268 {
 269         if (rproc_elf_load_rsc_table(rproc, fw))
 270                 dev_warn(&rproc->dev, "no resource table found for this firmware\n");
 271
 272         return 0;
 273 }
 274
 275 static irqreturn_t stm32_rproc_wdg(int irq, void *data)
 276 {
 277         struct platform_device *pdev = data;
 278         struct rproc *rproc = platform_get_drvdata(pdev);
 279
 280         rproc_report_crash(rproc, RPROC_WATCHDOG);
 281
 282         return IRQ_HANDLED;
 283 }
 284
 285 static void stm32_rproc_mb_vq_work(struct work_struct *work)
 286 {
 287         struct stm32_mbox *mb = container_of(work, struct stm32_mbox, vq_work);
 288         struct rproc *rproc = dev_get_drvdata(mb->client.dev);
 289
 290         if (rproc_vq_interrupt(rproc, mb->vq_id) == IRQ_NONE)
 291                 dev_dbg(&rproc->dev, "no message found in vq%d\n", mb->vq_id);
 292 }
 293
 294 static void stm32_rproc_mb_callback(struct mbox_client *cl, void *data)
 295 {
 296         struct rproc *rproc = dev_get_drvdata(cl->dev);
 297         struct stm32_mbox *mb = container_of(cl, struct stm32_mbox, client);
 298         struct stm32_rproc *ddata = rproc->priv;
 299
 300         queue_work(ddata->workqueue, &mb->vq_work);
 301 }
 302
 303 static void stm32_rproc_free_mbox(struct rproc *rproc)
 304 {
 305         struct stm32_rproc *ddata = rproc->priv;
 306         unsigned int i;
 307
 308         for (i = 0; i < ARRAY_SIZE(ddata->mb); i++) {
 309                 if (ddata->mb[i].chan)
 310                         mbox_free_channel(ddata->mb[i].chan);
 311                 ddata->mb[i].chan = NULL;
 312         }
 313 }
 314
 315 static const struct stm32_mbox stm32_rproc_mbox[MBOX_NB_MBX] = {
 316         {
 317                 .name = STM32_MBX_VQ0,
 318                 .vq_id = STM32_MBX_VQ0_ID,
 319                 .client = {
 320                         .rx_callback = stm32_rproc_mb_callback,
 321                         .tx_block = false,
 322                 },
 323         },
 324         {
 325                 .name = STM32_MBX_VQ1,
 326                 .vq_id = STM32_MBX_VQ1_ID,
 327                 .client = {
 328                         .rx_callback = stm32_rproc_mb_callback,
 329                         .tx_block = false,
 330                 },
 331         },
 332         {
 333                 .name = STM32_MBX_SHUTDOWN,
 334                 .vq_id = -1,
 335                 .client = {
 336                         .tx_block = true,
 337                         .tx_done = NULL,
 338                         .tx_tout = 500, /* 500 ms time out */
 339                 },
 340         },
 341         {
 342                 .name = STM32_MBX_DETACH,
 343                 .vq_id = -1,
 344                 .client = {
 345                         .tx_block = true,
 346                         .tx_done = NULL,
 347                         .tx_tout = 200, /* 200 ms time out to detach should be fair enough */
 348                 },
 349         }
 350 };
 351
 352 static int stm32_rproc_request_mbox(struct rproc *rproc)
 353 {
 354         struct stm32_rproc *ddata = rproc->priv;
 355         struct device *dev = &rproc->dev;
 356         unsigned int i;
 357         int j;
 358         const unsigned char *name;
 359         struct mbox_client *cl;
 360
 361         /* Initialise mailbox structure table */
 362         memcpy(ddata->mb, stm32_rproc_mbox, sizeof(stm32_rproc_mbox));
 363
 364         for (i = 0; i < MBOX_NB_MBX; i++) {
 365                 name = ddata->mb[i].name;
 366
 367                 cl = &ddata->mb[i].client;
 368                 cl->dev = dev->parent;
 369
 370                 ddata->mb[i].chan = mbox_request_channel_byname(cl, name);
 371                 if (IS_ERR(ddata->mb[i].chan)) {
 372                         if (PTR_ERR(ddata->mb[i].chan) == -EPROBE_DEFER) {
 373                                 dev_err_probe(dev->parent,
 374                                               PTR_ERR(ddata->mb[i].chan),
 375                                               "failed to request mailbox %s\n",
 376                                               name);
 377                                 goto err_probe;
 378                         }
 379                         dev_warn(dev, "cannot get %s mbox\n", name);
 380                         ddata->mb[i].chan = NULL;
 381                 }
 382                 if (ddata->mb[i].vq_id >= 0) {
 383                         INIT_WORK(&ddata->mb[i].vq_work,
 384                                   stm32_rproc_mb_vq_work);
 385                 }
 386         }
 387
 388         return 0;
 389
 390 err_probe:
 391         for (j = i - 1; j >= 0; j--)
 392                 if (ddata->mb[j].chan)
 393                         mbox_free_channel(ddata->mb[j].chan);
 394         return -EPROBE_DEFER;
 395 }
 396
 397 static int stm32_rproc_set_hold_boot(struct rproc *rproc, bool hold)
 398 {
 399         struct stm32_rproc *ddata = rproc->priv;
 400         struct stm32_syscon hold_boot = ddata->hold_boot;
 401         struct arm_smccc_res smc_res;
 402         int val, err;
 403
 404         val = hold ? HOLD_BOOT : RELEASE_BOOT;
 405
 406         if (IS_ENABLED(CONFIG_HAVE_ARM_SMCCC) && ddata->secured_soc) {
 407                 arm_smccc_smc(STM32_SMC_RCC, STM32_SMC_REG_WRITE,
 408                               hold_boot.reg, val, 0, 0, 0, 0, &smc_res);
 409                 err = smc_res.a0;
 410         } else {
 411                 err = regmap_update_bits(hold_boot.map, hold_boot.reg,
 412                                          hold_boot.mask, val);
 413         }
 414
 415         if (err)
 416                 dev_err(&rproc->dev, "failed to set hold boot\n");
 417
 418         return err;
 419 }
 420
 421 static void stm32_rproc_add_coredump_trace(struct rproc *rproc)
 422 {
 423         struct rproc_debug_trace *trace;
 424         struct rproc_dump_segment *segment;
 425         bool already_added;
 426
 427         list_for_each_entry(trace, &rproc->traces, node) {
 428                 already_added = false;
 429
 430                 list_for_each_entry(segment, &rproc->dump_segments, node) {
 431                         if (segment->da == trace->trace_mem.da) {
 432                                 already_added = true;
 433                                 break;
 434                         }
 435                 }
 436
 437                 if (!already_added)
 438                         rproc_coredump_add_segment(rproc, trace->trace_mem.da,
 439                                                    trace->trace_mem.len);
 440         }
 441 }
 442
 443 static int stm32_rproc_start(struct rproc *rproc)
 444 {
 445         struct stm32_rproc *ddata = rproc->priv;
 446         int err;
 447
 448         stm32_rproc_add_coredump_trace(rproc);
 449
 450         /* clear remote proc Deep Sleep */
 451         if (ddata->pdds.map) {
 452                 err = regmap_update_bits(ddata->pdds.map, ddata->pdds.reg,
 453                                          ddata->pdds.mask, 0);
 454                 if (err) {
 455                         dev_err(&rproc->dev, "failed to clear pdds\n");
 456                         return err;
 457                 }
 458         }
 459
 460         err = stm32_rproc_set_hold_boot(rproc, false);
 461         if (err)
 462                 return err;
 463
 464         return stm32_rproc_set_hold_boot(rproc, true);
 465 }
 466
 467 static int stm32_rproc_attach(struct rproc *rproc)
 468 {
 469         stm32_rproc_add_coredump_trace(rproc);
 470
 471         return stm32_rproc_set_hold_boot(rproc, true);
 472 }
 473
 474 static int stm32_rproc_detach(struct rproc *rproc)
 475 {
 476         struct stm32_rproc *ddata = rproc->priv;
 477         int err, dummy_data, idx;
 478
 479         /* Inform the remote processor of the detach */
 480         idx = stm32_rproc_mbox_idx(rproc, STM32_MBX_DETACH);
 481         if (idx >= 0 && ddata->mb[idx].chan) {
 482                 /* A dummy data is sent to allow to block on transmit */
 483                 err = mbox_send_message(ddata->mb[idx].chan,
 484                                         &dummy_data);
 485                 if (err < 0)
 486                         dev_warn(&rproc->dev, "warning: remote FW detach without ack\n");
 487         }
 488
 489         /* Allow remote processor to auto-reboot */
 490         return stm32_rproc_set_hold_boot(rproc, false);
 491 }
 492
 493 static int stm32_rproc_stop(struct rproc *rproc)
 494 {
 495         struct stm32_rproc *ddata = rproc->priv;
 496         int err, dummy_data, idx;
 497
 498         /* request shutdown of the remote processor */
 499         if (rproc->state != RPROC_OFFLINE) {
 500                 idx = stm32_rproc_mbox_idx(rproc, STM32_MBX_SHUTDOWN);
 501                 if (idx >= 0 && ddata->mb[idx].chan) {
 502                         /* a dummy data is sent to allow to block on transmit */
 503                         err = mbox_send_message(ddata->mb[idx].chan,
 504                                                 &dummy_data);
 505                         if (err < 0)
 506                                 dev_warn(&rproc->dev, "warning: remote FW shutdown without ack\n");
 507                 }
 508         }
 509
 510         err = stm32_rproc_set_hold_boot(rproc, true);
 511         if (err)
 512                 return err;
 513
 514         err = reset_control_assert(ddata->rst);
 515         if (err) {
 516                 dev_err(&rproc->dev, "failed to assert the reset\n");
 517                 return err;
 518         }
 519
 520         /* to allow platform Standby power mode, set remote proc Deep Sleep */
 521         if (ddata->pdds.map) {
 522                 err = regmap_update_bits(ddata->pdds.map, ddata->pdds.reg,
 523                                          ddata->pdds.mask, 1);
 524                 if (err) {
 525                         dev_err(&rproc->dev, "failed to set pdds\n");
 526                         return err;
 527                 }
 528         }
 529
 530         /* update coprocessor state to OFF if available */
 531         if (ddata->m4_state.map) {
 532                 err = regmap_update_bits(ddata->m4_state.map,
 533                                          ddata->m4_state.reg,
 534                                          ddata->m4_state.mask,
 535                                          M4_STATE_OFF);
 536                 if (err) {
 537                         dev_err(&rproc->dev, "failed to set copro state\n");
 538                         return err;
 539                 }
 540         }
 541
 542         return 0;
 543 }
 544
 545 static void stm32_rproc_kick(struct rproc *rproc, int vqid)
 546 {
 547         struct stm32_rproc *ddata = rproc->priv;
 548         unsigned int i;
 549         int err;
 550
 551         if (WARN_ON(vqid >= MBOX_NB_VQ))
 552                 return;
 553
 554         for (i = 0; i < MBOX_NB_MBX; i++) {
 555                 if (vqid != ddata->mb[i].vq_id)
 556                         continue;
 557                 if (!ddata->mb[i].chan)
 558                         return;
 559                 err = mbox_send_message(ddata->mb[i].chan, (void *)(long)vqid);
 560                 if (err < 0)
 561                         dev_err(&rproc->dev, "%s: failed (%s, err:%d)\n",
 562                                 __func__, ddata->mb[i].name, err);
 563                 return;
 564         }
 565 }
 566
 567 static int stm32_rproc_da_to_pa(struct rproc *rproc,
 568                                 u64 da, phys_addr_t *pa)
 569 {
 570         struct stm32_rproc *ddata = rproc->priv;
 571         struct device *dev = rproc->dev.parent;
 572         struct stm32_rproc_mem *p_mem;
 573         unsigned int i;
 574
 575         for (i = 0; i < ddata->nb_rmems; i++) {
 576                 p_mem = &ddata->rmems[i];
 577
 578                 if (da < p_mem->dev_addr ||
 579                     da >= p_mem->dev_addr + p_mem->size)
 580                         continue;
 581
 582                 *pa = da - p_mem->dev_addr + p_mem->bus_addr;
 583                 dev_dbg(dev, "da %llx to pa %#x\n", da, *pa);
 584
 585                 return 0;
 586         }
 587
 588         dev_err(dev, "can't translate da %llx\n", da);
 589
 590         return -EINVAL;
 591 }
 592
 593 static struct resource_table *
 594 stm32_rproc_get_loaded_rsc_table(struct rproc *rproc, size_t *table_sz)
 595 {
 596         struct stm32_rproc *ddata = rproc->priv;
 597         struct device *dev = rproc->dev.parent;
 598         phys_addr_t rsc_pa;
 599         u32 rsc_da;
 600         int err;
 601
 602         /* The resource table has already been mapped, nothing to do */
 603         if (ddata->rsc_va)
 604                 goto done;
 605
 606         err = regmap_read(ddata->rsctbl.map, ddata->rsctbl.reg, &rsc_da);
 607         if (err) {
 608                 dev_err(dev, "failed to read rsc tbl addr\n");
 609                 return ERR_PTR(-EINVAL);
 610         }
 611
 612         if (!rsc_da)
 613                 /* no rsc table */
 614                 return ERR_PTR(-ENOENT);
 615
 616         err = stm32_rproc_da_to_pa(rproc, rsc_da, &rsc_pa);
 617         if (err)
 618                 return ERR_PTR(err);
 619
 620         ddata->rsc_va = devm_ioremap_wc(dev, rsc_pa, RSC_TBL_SIZE);
 621         if (IS_ERR_OR_NULL(ddata->rsc_va)) {
 622                 dev_err(dev, "Unable to map memory region: %pa+%zx\n",
 623                         &rsc_pa, RSC_TBL_SIZE);
 624                 ddata->rsc_va = NULL;
 625                 return ERR_PTR(-ENOMEM);
 626         }
 627
 628 done:
 629         /*
 630          * Assuming the resource table fits in 1kB is fair.
 631          * Notice for the detach, that this 1 kB memory area has to be reserved in the coprocessor
 632          * firmware for the resource table. On detach, the remoteproc core re-initializes this
 633          * entire area by overwriting it with the initial values stored in rproc->clean_table.
 634          */
 635         *table_sz = RSC_TBL_SIZE;
 636         return (struct resource_table *)ddata->rsc_va;
 637 }
 638
 639 static const struct rproc_ops st_rproc_ops = {
 640         .prepare        = stm32_rproc_prepare,
 641         .start          = stm32_rproc_start,
 642         .stop           = stm32_rproc_stop,
 643         .attach         = stm32_rproc_attach,
 644         .detach         = stm32_rproc_detach,
 645         .kick           = stm32_rproc_kick,
 646         .load           = rproc_elf_load_segments,
 647         .parse_fw       = stm32_rproc_parse_fw,
 648         .find_loaded_rsc_table = rproc_elf_find_loaded_rsc_table,
 649         .get_loaded_rsc_table = stm32_rproc_get_loaded_rsc_table,
 650         .sanity_check   = rproc_elf_sanity_check,
 651         .get_boot_addr  = rproc_elf_get_boot_addr,
 652 };
 653
 654 static const struct of_device_id stm32_rproc_match[] = {
 655         { .compatible = "st,stm32mp1-m4" },
 656         {},
 657 };
 658 MODULE_DEVICE_TABLE(of, stm32_rproc_match);
 659
 660 static int stm32_rproc_get_syscon(struct device_node *np, const char *prop,
 661                                   struct stm32_syscon *syscon)
 662 {
 663         int err = 0;
 664
 665         syscon->map = syscon_regmap_lookup_by_phandle(np, prop);
 666         if (IS_ERR(syscon->map)) {
 667                 err = PTR_ERR(syscon->map);
 668                 syscon->map = NULL;
 669                 goto out;
 670         }
 671
 672         err = of_property_read_u32_index(np, prop, 1, &syscon->reg);
 673         if (err)
 674                 goto out;
 675
 676         err = of_property_read_u32_index(np, prop, 2, &syscon->mask);
 677
 678 out:
 679         return err;
 680 }
 681
 682 static int stm32_rproc_parse_dt(struct platform_device *pdev,
 683                                 struct stm32_rproc *ddata, bool *auto_boot)
 684 {
 685         struct device *dev = &pdev->dev;
 686         struct device_node *np = dev->of_node;
 687         struct stm32_syscon tz;
 688         unsigned int tzen;
 689         int err, irq;
 690
 691         irq = platform_get_irq(pdev, 0);
 692         if (irq == -EPROBE_DEFER)
 693                 return dev_err_probe(dev, irq, "failed to get interrupt\n");
 694
 695         if (irq > 0) {
 696                 err = devm_request_irq(dev, irq, stm32_rproc_wdg, 0,
 697                                        dev_name(dev), pdev);
 698                 if (err)
 699                         return dev_err_probe(dev, err,
 700                                              "failed to request wdg irq\n");
 701
 702                 ddata->wdg_irq = irq;
 703
 704                 if (of_property_read_bool(np, "wakeup-source")) {
 705                         device_init_wakeup(dev, true);
 706                         dev_pm_set_wake_irq(dev, irq);
 707                 }
 708
 709                 dev_info(dev, "wdg irq registered\n");
 710         }
 711
 712         ddata->rst = devm_reset_control_get_by_index(dev, 0);
 713         if (IS_ERR(ddata->rst))
 714                 return dev_err_probe(dev, PTR_ERR(ddata->rst),
 715                                      "failed to get mcu_reset\n");
 716
 717         /*
 718          * if platform is secured the hold boot bit must be written by
 719          * smc call and read normally.
 720          * if not secure the hold boot bit could be read/write normally
 721          */
 722         err = stm32_rproc_get_syscon(np, "st,syscfg-tz", &tz);
 723         if (err) {
 724                 dev_err(dev, "failed to get tz syscfg\n");
 725                 return err;
 726         }
 727
 728         err = regmap_read(tz.map, tz.reg, &tzen);
 729         if (err) {
 730                 dev_err(dev, "failed to read tzen\n");
 731                 return err;
 732         }
 733         ddata->secured_soc = tzen & tz.mask;
 734
 735         err = stm32_rproc_get_syscon(np, "st,syscfg-holdboot",
 736                                      &ddata->hold_boot);
 737         if (err) {
 738                 dev_err(dev, "failed to get hold boot\n");
 739                 return err;
 740         }
 741
 742         err = stm32_rproc_get_syscon(np, "st,syscfg-pdds", &ddata->pdds);
 743         if (err)
 744                 dev_info(dev, "failed to get pdds\n");
 745
 746         *auto_boot = of_property_read_bool(np, "st,auto-boot");
 747
 748         /*
 749          * See if we can check the M4 status, i.e if it was started
 750          * from the boot loader or not.
 751          */
 752         err = stm32_rproc_get_syscon(np, "st,syscfg-m4-state",
 753                                      &ddata->m4_state);
 754         if (err) {
 755                 /* remember this */
 756                 ddata->m4_state.map = NULL;
 757                 /* no coprocessor state syscon (optional) */
 758                 dev_warn(dev, "m4 state not supported\n");
 759
 760                 /* no need to go further */
 761                 return 0;
 762         }
 763
 764         /* See if we can get the resource table */
 765         err = stm32_rproc_get_syscon(np, "st,syscfg-rsc-tbl",
 766                                      &ddata->rsctbl);
 767         if (err) {
 768                 /* no rsc table syscon (optional) */
 769                 dev_warn(dev, "rsc tbl syscon not supported\n");
 770         }
 771
 772         return 0;
 773 }
 774
 775 static int stm32_rproc_get_m4_status(struct stm32_rproc *ddata,
 776                                      unsigned int *state)
 777 {
 778         /* See stm32_rproc_parse_dt() */
 779         if (!ddata->m4_state.map) {
 780                 /*
 781                  * We couldn't get the coprocessor's state, assume
 782                  * it is not running.
 783                  */
 784                 *state = M4_STATE_OFF;
 785                 return 0;
 786         }
 787
 788         return regmap_read(ddata->m4_state.map, ddata->m4_state.reg, state);
 789 }
 790
 791 static int stm32_rproc_probe(struct platform_device *pdev)
 792 {
 793         struct device *dev = &pdev->dev;
 794         struct stm32_rproc *ddata;
 795         struct device_node *np = dev->of_node;
 796         struct rproc *rproc;
 797         unsigned int state;
 798         int ret;
 799
 800         ret = dma_coerce_mask_and_coherent(dev, DMA_BIT_MASK(32));
 801         if (ret)
 802                 return ret;
 803
 804         rproc = rproc_alloc(dev, np->name, &st_rproc_ops, NULL, sizeof(*ddata));
 805         if (!rproc)
 806                 return -ENOMEM;
 807
 808         ddata = rproc->priv;
 809
 810         rproc_coredump_set_elf_info(rproc, ELFCLASS32, EM_NONE);
 811
 812         ret = stm32_rproc_parse_dt(pdev, ddata, &rproc->auto_boot);
 813         if (ret)
 814                 goto free_rproc;
 815
 816         ret = stm32_rproc_of_memory_translations(pdev, ddata);
 817         if (ret)
 818                 goto free_rproc;
 819
 820         ret = stm32_rproc_get_m4_status(ddata, &state);
 821         if (ret)
 822                 goto free_rproc;
 823
 824         if (state == M4_STATE_CRUN)
 825                 rproc->state = RPROC_DETACHED;
 826
 827         rproc->has_iommu = false;
 828         ddata->workqueue = create_workqueue(dev_name(dev));
 829         if (!ddata->workqueue) {
 830                 dev_err(dev, "cannot create workqueue\n");
 831                 ret = -ENOMEM;
 832                 goto free_resources;
 833         }
 834
 835         platform_set_drvdata(pdev, rproc);
 836
 837         ret = stm32_rproc_request_mbox(rproc);
 838         if (ret)
 839                 goto free_wkq;
 840
 841         ret = rproc_add(rproc);
 842         if (ret)
 843                 goto free_mb;
 844
 845         return 0;
 846
 847 free_mb:
 848         stm32_rproc_free_mbox(rproc);
 849 free_wkq:
 850         destroy_workqueue(ddata->workqueue);
 851 free_resources:
 852         rproc_resource_cleanup(rproc);
 853 free_rproc:
 854         if (device_may_wakeup(dev)) {
 855                 dev_pm_clear_wake_irq(dev);
 856                 device_init_wakeup(dev, false);
 857         }
 858         rproc_free(rproc);
 859         return ret;
 860 }
 861
 862 static int stm32_rproc_remove(struct platform_device *pdev)
 863 {
 864         struct rproc *rproc = platform_get_drvdata(pdev);
 865         struct stm32_rproc *ddata = rproc->priv;
 866         struct device *dev = &pdev->dev;
 867
 868         if (atomic_read(&rproc->power) > 0)
 869                 rproc_shutdown(rproc);
 870
 871         rproc_del(rproc);
 872         stm32_rproc_free_mbox(rproc);
 873         destroy_workqueue(ddata->workqueue);
 874
 875         if (device_may_wakeup(dev)) {
 876                 dev_pm_clear_wake_irq(dev);
 877                 device_init_wakeup(dev, false);
 878         }
 879         rproc_free(rproc);
 880
 881         return 0;
 882 }
 883
 884 static int __maybe_unused stm32_rproc_suspend(struct device *dev)
 885 {
 886         struct rproc *rproc = dev_get_drvdata(dev);
 887         struct stm32_rproc *ddata = rproc->priv;
 888
 889         if (device_may_wakeup(dev))
 890                 return enable_irq_wake(ddata->wdg_irq);
 891
 892         return 0;
 893 }
 894
 895 static int __maybe_unused stm32_rproc_resume(struct device *dev)
 896 {
 897         struct rproc *rproc = dev_get_drvdata(dev);
 898         struct stm32_rproc *ddata = rproc->priv;
 899
 900         if (device_may_wakeup(dev))
 901                 return disable_irq_wake(ddata->wdg_irq);
 902
 903         return 0;
 904 }
 905
 906 static SIMPLE_DEV_PM_OPS(stm32_rproc_pm_ops,
 907                          stm32_rproc_suspend, stm32_rproc_resume);
 908
 909 static struct platform_driver stm32_rproc_driver = {
 910         .probe = stm32_rproc_probe,
 911         .remove = stm32_rproc_remove,
 912         .driver = {
 913                 .name = "stm32-rproc",
 914                 .pm = &stm32_rproc_pm_ops,
 915                 .of_match_table = of_match_ptr(stm32_rproc_match),
 916         },
 917 };
 918 module_platform_driver(stm32_rproc_driver);
 919
 920 MODULE_DESCRIPTION("STM32 Remote Processor Control Driver");
 921 MODULE_AUTHOR("Ludovic Barre <ludovic.barre@st.com>");
 922 MODULE_AUTHOR("Fabien Dessenne <fabien.dessenne@st.com>");
 923 MODULE_LICENSE("GPL v2");
 924