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 #define RSC_TBL_SIZE            1024
  43
  44 #define M4_STATE_OFF            0
  45 #define M4_STATE_INI            1
  46 #define M4_STATE_CRUN           2
  47 #define M4_STATE_CSTOP          3
  48 #define M4_STATE_STANDBY        4
  49 #define M4_STATE_CRASH          5
  50
  51 struct stm32_syscon {
  52         struct regmap *map;
  53         u32 reg;
  54         u32 mask;
  55 };
  56
  57 struct stm32_rproc_mem {
  58         char name[20];
  59         void __iomem *cpu_addr;
  60         phys_addr_t bus_addr;
  61         u32 dev_addr;
  62         size_t size;
  63 };
  64
  65 struct stm32_rproc_mem_ranges {
  66         u32 dev_addr;
  67         u32 bus_addr;
  68         u32 size;
  69 };
  70
  71 struct stm32_mbox {
  72         const unsigned char name[10];
  73         struct mbox_chan *chan;
  74         struct mbox_client client;
  75         struct work_struct vq_work;
  76         int vq_id;
  77 };
  78
  79 struct stm32_rproc {
  80         struct reset_control *rst;
  81         struct stm32_syscon hold_boot;
  82         struct stm32_syscon pdds;
  83         struct stm32_syscon m4_state;
  84         struct stm32_syscon rsctbl;
  85         int wdg_irq;
  86         u32 nb_rmems;
  87         struct stm32_rproc_mem *rmems;
  88         struct stm32_mbox mb[MBOX_NB_MBX];
  89         struct workqueue_struct *workqueue;
  90         bool secured_soc;
  91         void __iomem *rsc_va;
  92 };
  93
  94 static int stm32_rproc_pa_to_da(struct rproc *rproc, phys_addr_t pa, u64 *da)
  95 {
  96         unsigned int i;
  97         struct stm32_rproc *ddata = rproc->priv;
  98         struct stm32_rproc_mem *p_mem;
  99
 100         for (i = 0; i < ddata->nb_rmems; i++) {
 101                 p_mem = &ddata->rmems[i];
 102
 103                 if (pa < p_mem->bus_addr ||
 104                     pa >= p_mem->bus_addr + p_mem->size)
 105                         continue;
 106                 *da = pa - p_mem->bus_addr + p_mem->dev_addr;
 107                 dev_dbg(rproc->dev.parent, "pa %pa to da %llx\n", &pa, *da);
 108                 return 0;
 109         }
 110
 111         return -EINVAL;
 112 }
 113
 114 static int stm32_rproc_mem_alloc(struct rproc *rproc,
 115                                  struct rproc_mem_entry *mem)
 116 {
 117         struct device *dev = rproc->dev.parent;
 118         void *va;
 119
 120         dev_dbg(dev, "map memory: %pa+%x\n", &mem->dma, mem->len);
 121         va = ioremap_wc(mem->dma, mem->len);
 122         if (IS_ERR_OR_NULL(va)) {
 123                 dev_err(dev, "Unable to map memory region: %pa+%x\n",
 124                         &mem->dma, mem->len);
 125                 return -ENOMEM;
 126         }
 127
 128         /* Update memory entry va */
 129         mem->va = va;
 130
 131         return 0;
 132 }
 133
 134 static int stm32_rproc_mem_release(struct rproc *rproc,
 135                                    struct rproc_mem_entry *mem)
 136 {
 137         dev_dbg(rproc->dev.parent, "unmap memory: %pa\n", &mem->dma);
 138         iounmap(mem->va);
 139
 140         return 0;
 141 }
 142
 143 static int stm32_rproc_of_memory_translations(struct platform_device *pdev,
 144                                               struct stm32_rproc *ddata)
 145 {
 146         struct device *parent, *dev = &pdev->dev;
 147         struct device_node *np;
 148         struct stm32_rproc_mem *p_mems;
 149         struct stm32_rproc_mem_ranges *mem_range;
 150         int cnt, array_size, i, ret = 0;
 151
 152         parent = dev->parent;
 153         np = parent->of_node;
 154
 155         cnt = of_property_count_elems_of_size(np, "dma-ranges",
 156                                               sizeof(*mem_range));
 157         if (cnt <= 0) {
 158                 dev_err(dev, "%s: dma-ranges property not defined\n", __func__);
 159                 return -EINVAL;
 160         }
 161
 162         p_mems = devm_kcalloc(dev, cnt, sizeof(*p_mems), GFP_KERNEL);
 163         if (!p_mems)
 164                 return -ENOMEM;
 165         mem_range = kcalloc(cnt, sizeof(*mem_range), GFP_KERNEL);
 166         if (!mem_range)
 167                 return -ENOMEM;
 168
 169         array_size = cnt * sizeof(struct stm32_rproc_mem_ranges) / sizeof(u32);
 170
 171         ret = of_property_read_u32_array(np, "dma-ranges",
 172                                          (u32 *)mem_range, array_size);
 173         if (ret) {
 174                 dev_err(dev, "error while get dma-ranges property: %x\n", ret);
 175                 goto free_mem;
 176         }
 177
 178         for (i = 0; i < cnt; i++) {
 179                 p_mems[i].bus_addr = mem_range[i].bus_addr;
 180                 p_mems[i].dev_addr = mem_range[i].dev_addr;
 181                 p_mems[i].size     = mem_range[i].size;
 182
 183                 dev_dbg(dev, "memory range[%i]: da %#x, pa %pa, size %#zx:\n",
 184                         i, p_mems[i].dev_addr, &p_mems[i].bus_addr,
 185                         p_mems[i].size);
 186         }
 187
 188         ddata->rmems = p_mems;
 189         ddata->nb_rmems = cnt;
 190
 191 free_mem:
 192         kfree(mem_range);
 193         return ret;
 194 }
 195
 196 static int stm32_rproc_mbox_idx(struct rproc *rproc, const unsigned char *name)
 197 {
 198         struct stm32_rproc *ddata = rproc->priv;
 199         int i;
 200
 201         for (i = 0; i < ARRAY_SIZE(ddata->mb); i++) {
 202                 if (!strncmp(ddata->mb[i].name, name, strlen(name)))
 203                         return i;
 204         }
 205         dev_err(&rproc->dev, "mailbox %s not found\n", name);
 206
 207         return -EINVAL;
 208 }
 209
 210 static int stm32_rproc_elf_load_rsc_table(struct rproc *rproc,
 211                                           const struct firmware *fw)
 212 {
 213         if (rproc_elf_load_rsc_table(rproc, fw))
 214                 dev_warn(&rproc->dev, "no resource table found for this firmware\n");
 215
 216         return 0;
 217 }
 218
 219 static int stm32_rproc_parse_memory_regions(struct rproc *rproc)
 220 {
 221         struct device *dev = rproc->dev.parent;
 222         struct device_node *np = dev->of_node;
 223         struct of_phandle_iterator it;
 224         struct rproc_mem_entry *mem;
 225         struct reserved_mem *rmem;
 226         u64 da;
 227         int index = 0;
 228
 229         /* Register associated reserved memory regions */
 230         of_phandle_iterator_init(&it, np, "memory-region", NULL, 0);
 231         while (of_phandle_iterator_next(&it) == 0) {
 232                 rmem = of_reserved_mem_lookup(it.node);
 233                 if (!rmem) {
 234                         dev_err(dev, "unable to acquire memory-region\n");
 235                         return -EINVAL;
 236                 }
 237
 238                 if (stm32_rproc_pa_to_da(rproc, rmem->base, &da) < 0) {
 239                         dev_err(dev, "memory region not valid %pa\n",
 240                                 &rmem->base);
 241                         return -EINVAL;
 242                 }
 243
 244                 /*  No need to map vdev buffer */
 245                 if (strcmp(it.node->name, "vdev0buffer")) {
 246                         /* Register memory region */
 247                         mem = rproc_mem_entry_init(dev, NULL,
 248                                                    (dma_addr_t)rmem->base,
 249                                                    rmem->size, da,
 250                                                    stm32_rproc_mem_alloc,
 251                                                    stm32_rproc_mem_release,
 252                                                    it.node->name);
 253
 254                         if (mem)
 255                                 rproc_coredump_add_segment(rproc, da,
 256                                                            rmem->size);
 257                 } else {
 258                         /* Register reserved memory for vdev buffer alloc */
 259                         mem = rproc_of_resm_mem_entry_init(dev, index,
 260                                                            rmem->size,
 261                                                            rmem->base,
 262                                                            it.node->name);
 263                 }
 264
 265                 if (!mem)
 266                         return -ENOMEM;
 267
 268                 rproc_add_carveout(rproc, mem);
 269                 index++;
 270         }
 271
 272         return 0;
 273 }
 274
 275 static int stm32_rproc_parse_fw(struct rproc *rproc, const struct firmware *fw)
 276 {
 277         int ret = stm32_rproc_parse_memory_regions(rproc);
 278
 279         if (ret)
 280                 return ret;
 281
 282         return stm32_rproc_elf_load_rsc_table(rproc, fw);
 283 }
 284
 285 static irqreturn_t stm32_rproc_wdg(int irq, void *data)
 286 {
 287         struct platform_device *pdev = data;
 288         struct rproc *rproc = platform_get_drvdata(pdev);
 289
 290         rproc_report_crash(rproc, RPROC_WATCHDOG);
 291
 292         return IRQ_HANDLED;
 293 }
 294
 295 static void stm32_rproc_mb_vq_work(struct work_struct *work)
 296 {
 297         struct stm32_mbox *mb = container_of(work, struct stm32_mbox, vq_work);
 298         struct rproc *rproc = dev_get_drvdata(mb->client.dev);
 299
 300         if (rproc_vq_interrupt(rproc, mb->vq_id) == IRQ_NONE)
 301                 dev_dbg(&rproc->dev, "no message found in vq%d\n", mb->vq_id);
 302 }
 303
 304 static void stm32_rproc_mb_callback(struct mbox_client *cl, void *data)
 305 {
 306         struct rproc *rproc = dev_get_drvdata(cl->dev);
 307         struct stm32_mbox *mb = container_of(cl, struct stm32_mbox, client);
 308         struct stm32_rproc *ddata = rproc->priv;
 309
 310         queue_work(ddata->workqueue, &mb->vq_work);
 311 }
 312
 313 static void stm32_rproc_free_mbox(struct rproc *rproc)
 314 {
 315         struct stm32_rproc *ddata = rproc->priv;
 316         unsigned int i;
 317
 318         for (i = 0; i < ARRAY_SIZE(ddata->mb); i++) {
 319                 if (ddata->mb[i].chan)
 320                         mbox_free_channel(ddata->mb[i].chan);
 321                 ddata->mb[i].chan = NULL;
 322         }
 323 }
 324
 325 static const struct stm32_mbox stm32_rproc_mbox[MBOX_NB_MBX] = {
 326         {
 327                 .name = STM32_MBX_VQ0,
 328                 .vq_id = STM32_MBX_VQ0_ID,
 329                 .client = {
 330                         .rx_callback = stm32_rproc_mb_callback,
 331                         .tx_block = false,
 332                 },
 333         },
 334         {
 335                 .name = STM32_MBX_VQ1,
 336                 .vq_id = STM32_MBX_VQ1_ID,
 337                 .client = {
 338                         .rx_callback = stm32_rproc_mb_callback,
 339                         .tx_block = false,
 340                 },
 341         },
 342         {
 343                 .name = STM32_MBX_SHUTDOWN,
 344                 .vq_id = -1,
 345                 .client = {
 346                         .tx_block = true,
 347                         .tx_done = NULL,
 348                         .tx_tout = 500, /* 500 ms time out */
 349                 },
 350         }
 351 };
 352
 353 static int stm32_rproc_request_mbox(struct rproc *rproc)
 354 {
 355         struct stm32_rproc *ddata = rproc->priv;
 356         struct device *dev = &rproc->dev;
 357         unsigned int i;
 358         int j;
 359         const unsigned char *name;
 360         struct mbox_client *cl;
 361
 362         /* Initialise mailbox structure table */
 363         memcpy(ddata->mb, stm32_rproc_mbox, sizeof(stm32_rproc_mbox));
 364
 365         for (i = 0; i < MBOX_NB_MBX; i++) {
 366                 name = ddata->mb[i].name;
 367
 368                 cl = &ddata->mb[i].client;
 369                 cl->dev = dev->parent;
 370
 371                 ddata->mb[i].chan = mbox_request_channel_byname(cl, name);
 372                 if (IS_ERR(ddata->mb[i].chan)) {
 373                         if (PTR_ERR(ddata->mb[i].chan) == -EPROBE_DEFER)
 374                                 goto err_probe;
 375                         dev_warn(dev, "cannot get %s mbox\n", name);
 376                         ddata->mb[i].chan = NULL;
 377                 }
 378                 if (ddata->mb[i].vq_id >= 0) {
 379                         INIT_WORK(&ddata->mb[i].vq_work,
 380                                   stm32_rproc_mb_vq_work);
 381                 }
 382         }
 383
 384         return 0;
 385
 386 err_probe:
 387         for (j = i - 1; j >= 0; j--)
 388                 if (ddata->mb[j].chan)
 389                         mbox_free_channel(ddata->mb[j].chan);
 390         return -EPROBE_DEFER;
 391 }
 392
 393 static int stm32_rproc_set_hold_boot(struct rproc *rproc, bool hold)
 394 {
 395         struct stm32_rproc *ddata = rproc->priv;
 396         struct stm32_syscon hold_boot = ddata->hold_boot;
 397         struct arm_smccc_res smc_res;
 398         int val, err;
 399
 400         val = hold ? HOLD_BOOT : RELEASE_BOOT;
 401
 402         if (IS_ENABLED(CONFIG_HAVE_ARM_SMCCC) && ddata->secured_soc) {
 403                 arm_smccc_smc(STM32_SMC_RCC, STM32_SMC_REG_WRITE,
 404                               hold_boot.reg, val, 0, 0, 0, 0, &smc_res);
 405                 err = smc_res.a0;
 406         } else {
 407                 err = regmap_update_bits(hold_boot.map, hold_boot.reg,
 408                                          hold_boot.mask, val);
 409         }
 410
 411         if (err)
 412                 dev_err(&rproc->dev, "failed to set hold boot\n");
 413
 414         return err;
 415 }
 416
 417 static void stm32_rproc_add_coredump_trace(struct rproc *rproc)
 418 {
 419         struct rproc_debug_trace *trace;
 420         struct rproc_dump_segment *segment;
 421         bool already_added;
 422
 423         list_for_each_entry(trace, &rproc->traces, node) {
 424                 already_added = false;
 425
 426                 list_for_each_entry(segment, &rproc->dump_segments, node) {
 427                         if (segment->da == trace->trace_mem.da) {
 428                                 already_added = true;
 429                                 break;
 430                         }
 431                 }
 432
 433                 if (!already_added)
 434                         rproc_coredump_add_segment(rproc, trace->trace_mem.da,
 435                                                    trace->trace_mem.len);
 436         }
 437 }
 438
 439 static int stm32_rproc_start(struct rproc *rproc)
 440 {
 441         struct stm32_rproc *ddata = rproc->priv;
 442         int err;
 443
 444         stm32_rproc_add_coredump_trace(rproc);
 445
 446         /* clear remote proc Deep Sleep */
 447         if (ddata->pdds.map) {
 448                 err = regmap_update_bits(ddata->pdds.map, ddata->pdds.reg,
 449                                          ddata->pdds.mask, 0);
 450                 if (err) {
 451                         dev_err(&rproc->dev, "failed to clear pdds\n");
 452                         return err;
 453                 }
 454         }
 455
 456         err = stm32_rproc_set_hold_boot(rproc, false);
 457         if (err)
 458                 return err;
 459
 460         return stm32_rproc_set_hold_boot(rproc, true);
 461 }
 462
 463 static int stm32_rproc_attach(struct rproc *rproc)
 464 {
 465         stm32_rproc_add_coredump_trace(rproc);
 466
 467         return stm32_rproc_set_hold_boot(rproc, true);
 468 }
 469
 470 static int stm32_rproc_stop(struct rproc *rproc)
 471 {
 472         struct stm32_rproc *ddata = rproc->priv;
 473         int err, dummy_data, idx;
 474
 475         /* request shutdown of the remote processor */
 476         if (rproc->state != RPROC_OFFLINE) {
 477                 idx = stm32_rproc_mbox_idx(rproc, STM32_MBX_SHUTDOWN);
 478                 if (idx >= 0 && ddata->mb[idx].chan) {
 479                         /* a dummy data is sent to allow to block on transmit */
 480                         err = mbox_send_message(ddata->mb[idx].chan,
 481                                                 &dummy_data);
 482                         if (err < 0)
 483                                 dev_warn(&rproc->dev, "warning: remote FW shutdown without ack\n");
 484                 }
 485         }
 486
 487         err = stm32_rproc_set_hold_boot(rproc, true);
 488         if (err)
 489                 return err;
 490
 491         err = reset_control_assert(ddata->rst);
 492         if (err) {
 493                 dev_err(&rproc->dev, "failed to assert the reset\n");
 494                 return err;
 495         }
 496
 497         /* to allow platform Standby power mode, set remote proc Deep Sleep */
 498         if (ddata->pdds.map) {
 499                 err = regmap_update_bits(ddata->pdds.map, ddata->pdds.reg,
 500                                          ddata->pdds.mask, 1);
 501                 if (err) {
 502                         dev_err(&rproc->dev, "failed to set pdds\n");
 503                         return err;
 504                 }
 505         }
 506
 507         /* update coprocessor state to OFF if available */
 508         if (ddata->m4_state.map) {
 509                 err = regmap_update_bits(ddata->m4_state.map,
 510                                          ddata->m4_state.reg,
 511                                          ddata->m4_state.mask,
 512                                          M4_STATE_OFF);
 513                 if (err) {
 514                         dev_err(&rproc->dev, "failed to set copro state\n");
 515                         return err;
 516                 }
 517         }
 518
 519         return 0;
 520 }
 521
 522 static void stm32_rproc_kick(struct rproc *rproc, int vqid)
 523 {
 524         struct stm32_rproc *ddata = rproc->priv;
 525         unsigned int i;
 526         int err;
 527
 528         if (WARN_ON(vqid >= MBOX_NB_VQ))
 529                 return;
 530
 531         for (i = 0; i < MBOX_NB_MBX; i++) {
 532                 if (vqid != ddata->mb[i].vq_id)
 533                         continue;
 534                 if (!ddata->mb[i].chan)
 535                         return;
 536                 err = mbox_send_message(ddata->mb[i].chan, (void *)(long)vqid);
 537                 if (err < 0)
 538                         dev_err(&rproc->dev, "%s: failed (%s, err:%d)\n",
 539                                 __func__, ddata->mb[i].name, err);
 540                 return;
 541         }
 542 }
 543
 544 static struct rproc_ops st_rproc_ops = {
 545         .start          = stm32_rproc_start,
 546         .stop           = stm32_rproc_stop,
 547         .attach         = stm32_rproc_attach,
 548         .kick           = stm32_rproc_kick,
 549         .load           = rproc_elf_load_segments,
 550         .parse_fw       = stm32_rproc_parse_fw,
 551         .find_loaded_rsc_table = rproc_elf_find_loaded_rsc_table,
 552         .sanity_check   = rproc_elf_sanity_check,
 553         .get_boot_addr  = rproc_elf_get_boot_addr,
 554 };
 555
 556 static const struct of_device_id stm32_rproc_match[] = {
 557         { .compatible = "st,stm32mp1-m4" },
 558         {},
 559 };
 560 MODULE_DEVICE_TABLE(of, stm32_rproc_match);
 561
 562 static int stm32_rproc_get_syscon(struct device_node *np, const char *prop,
 563                                   struct stm32_syscon *syscon)
 564 {
 565         int err = 0;
 566
 567         syscon->map = syscon_regmap_lookup_by_phandle(np, prop);
 568         if (IS_ERR(syscon->map)) {
 569                 err = PTR_ERR(syscon->map);
 570                 syscon->map = NULL;
 571                 goto out;
 572         }
 573
 574         err = of_property_read_u32_index(np, prop, 1, &syscon->reg);
 575         if (err)
 576                 goto out;
 577
 578         err = of_property_read_u32_index(np, prop, 2, &syscon->mask);
 579
 580 out:
 581         return err;
 582 }
 583
 584 static int stm32_rproc_parse_dt(struct platform_device *pdev,
 585                                 struct stm32_rproc *ddata, bool *auto_boot)
 586 {
 587         struct device *dev = &pdev->dev;
 588         struct device_node *np = dev->of_node;
 589         struct stm32_syscon tz;
 590         unsigned int tzen;
 591         int err, irq;
 592
 593         irq = platform_get_irq(pdev, 0);
 594         if (irq == -EPROBE_DEFER)
 595                 return -EPROBE_DEFER;
 596
 597         if (irq > 0) {
 598                 err = devm_request_irq(dev, irq, stm32_rproc_wdg, 0,
 599                                        dev_name(dev), pdev);
 600                 if (err) {
 601                         dev_err(dev, "failed to request wdg irq\n");
 602                         return err;
 603                 }
 604
 605                 ddata->wdg_irq = irq;
 606
 607                 if (of_property_read_bool(np, "wakeup-source")) {
 608                         device_init_wakeup(dev, true);
 609                         dev_pm_set_wake_irq(dev, irq);
 610                 }
 611
 612                 dev_info(dev, "wdg irq registered\n");
 613         }
 614
 615         ddata->rst = devm_reset_control_get_by_index(dev, 0);
 616         if (IS_ERR(ddata->rst)) {
 617                 dev_err(dev, "failed to get mcu reset\n");
 618                 return PTR_ERR(ddata->rst);
 619         }
 620
 621         /*
 622          * if platform is secured the hold boot bit must be written by
 623          * smc call and read normally.
 624          * if not secure the hold boot bit could be read/write normally
 625          */
 626         err = stm32_rproc_get_syscon(np, "st,syscfg-tz", &tz);
 627         if (err) {
 628                 dev_err(dev, "failed to get tz syscfg\n");
 629                 return err;
 630         }
 631
 632         err = regmap_read(tz.map, tz.reg, &tzen);
 633         if (err) {
 634                 dev_err(dev, "failed to read tzen\n");
 635                 return err;
 636         }
 637         ddata->secured_soc = tzen & tz.mask;
 638
 639         err = stm32_rproc_get_syscon(np, "st,syscfg-holdboot",
 640                                      &ddata->hold_boot);
 641         if (err) {
 642                 dev_err(dev, "failed to get hold boot\n");
 643                 return err;
 644         }
 645
 646         err = stm32_rproc_get_syscon(np, "st,syscfg-pdds", &ddata->pdds);
 647         if (err)
 648                 dev_info(dev, "failed to get pdds\n");
 649
 650         *auto_boot = of_property_read_bool(np, "st,auto-boot");
 651
 652         /*
 653          * See if we can check the M4 status, i.e if it was started
 654          * from the boot loader or not.
 655          */
 656         err = stm32_rproc_get_syscon(np, "st,syscfg-m4-state",
 657                                      &ddata->m4_state);
 658         if (err) {
 659                 /* remember this */
 660                 ddata->m4_state.map = NULL;
 661                 /* no coprocessor state syscon (optional) */
 662                 dev_warn(dev, "m4 state not supported\n");
 663
 664                 /* no need to go further */
 665                 return 0;
 666         }
 667
 668         /* See if we can get the resource table */
 669         err = stm32_rproc_get_syscon(np, "st,syscfg-rsc-tbl",
 670                                      &ddata->rsctbl);
 671         if (err) {
 672                 /* no rsc table syscon (optional) */
 673                 dev_warn(dev, "rsc tbl syscon not supported\n");
 674         }
 675
 676         return 0;
 677 }
 678
 679 static int stm32_rproc_get_m4_status(struct stm32_rproc *ddata,
 680                                      unsigned int *state)
 681 {
 682         /* See stm32_rproc_parse_dt() */
 683         if (!ddata->m4_state.map) {
 684                 /*
 685                  * We couldn't get the coprocessor's state, assume
 686                  * it is not running.
 687                  */
 688                 state = M4_STATE_OFF;
 689                 return 0;
 690         }
 691
 692         return regmap_read(ddata->m4_state.map, ddata->m4_state.reg, state);
 693 }
 694
 695 static int stm32_rproc_da_to_pa(struct platform_device *pdev,
 696                                 struct stm32_rproc *ddata,
 697                                 u64 da, phys_addr_t *pa)
 698 {
 699         struct device *dev = &pdev->dev;
 700         struct stm32_rproc_mem *p_mem;
 701         unsigned int i;
 702
 703         for (i = 0; i < ddata->nb_rmems; i++) {
 704                 p_mem = &ddata->rmems[i];
 705
 706                 if (da < p_mem->dev_addr ||
 707                     da >= p_mem->dev_addr + p_mem->size)
 708                         continue;
 709
 710                 *pa = da - p_mem->dev_addr + p_mem->bus_addr;
 711                 dev_dbg(dev, "da %llx to pa %#x\n", da, *pa);
 712
 713                 return 0;
 714         }
 715
 716         dev_err(dev, "can't translate da %llx\n", da);
 717
 718         return -EINVAL;
 719 }
 720
 721 static int stm32_rproc_get_loaded_rsc_table(struct platform_device *pdev,
 722                                             struct rproc *rproc,
 723                                             struct stm32_rproc *ddata)
 724 {
 725         struct device *dev = &pdev->dev;
 726         phys_addr_t rsc_pa;
 727         u32 rsc_da;
 728         int err;
 729
 730         err = regmap_read(ddata->rsctbl.map, ddata->rsctbl.reg, &rsc_da);
 731         if (err) {
 732                 dev_err(dev, "failed to read rsc tbl addr\n");
 733                 return err;
 734         }
 735
 736         if (!rsc_da)
 737                 /* no rsc table */
 738                 return 0;
 739
 740         err = stm32_rproc_da_to_pa(pdev, ddata, rsc_da, &rsc_pa);
 741         if (err)
 742                 return err;
 743
 744         ddata->rsc_va = devm_ioremap_wc(dev, rsc_pa, RSC_TBL_SIZE);
 745         if (IS_ERR_OR_NULL(ddata->rsc_va)) {
 746                 dev_err(dev, "Unable to map memory region: %pa+%zx\n",
 747                         &rsc_pa, RSC_TBL_SIZE);
 748                 ddata->rsc_va = NULL;
 749                 return -ENOMEM;
 750         }
 751
 752         /*
 753          * The resource table is already loaded in device memory, no need
 754          * to work with a cached table.
 755          */
 756         rproc->cached_table = NULL;
 757         /* Assuming the resource table fits in 1kB is fair */
 758         rproc->table_sz = RSC_TBL_SIZE;
 759         rproc->table_ptr = (struct resource_table *)ddata->rsc_va;
 760
 761         return 0;
 762 }
 763
 764 static int stm32_rproc_probe(struct platform_device *pdev)
 765 {
 766         struct device *dev = &pdev->dev;
 767         struct stm32_rproc *ddata;
 768         struct device_node *np = dev->of_node;
 769         struct rproc *rproc;
 770         unsigned int state;
 771         int ret;
 772
 773         ret = dma_coerce_mask_and_coherent(dev, DMA_BIT_MASK(32));
 774         if (ret)
 775                 return ret;
 776
 777         rproc = rproc_alloc(dev, np->name, &st_rproc_ops, NULL, sizeof(*ddata));
 778         if (!rproc)
 779                 return -ENOMEM;
 780
 781         ddata = rproc->priv;
 782
 783         rproc_coredump_set_elf_info(rproc, ELFCLASS32, EM_NONE);
 784
 785         ret = stm32_rproc_parse_dt(pdev, ddata, &rproc->auto_boot);
 786         if (ret)
 787                 goto free_rproc;
 788
 789         ret = stm32_rproc_of_memory_translations(pdev, ddata);
 790         if (ret)
 791                 goto free_rproc;
 792
 793         ret = stm32_rproc_get_m4_status(ddata, &state);
 794         if (ret)
 795                 goto free_rproc;
 796
 797         if (state == M4_STATE_CRUN) {
 798                 rproc->state = RPROC_DETACHED;
 799
 800                 ret = stm32_rproc_parse_memory_regions(rproc);
 801                 if (ret)
 802                         goto free_resources;
 803
 804                 ret = stm32_rproc_get_loaded_rsc_table(pdev, rproc, ddata);
 805                 if (ret)
 806                         goto free_resources;
 807         }
 808
 809         rproc->has_iommu = false;
 810         ddata->workqueue = create_workqueue(dev_name(dev));
 811         if (!ddata->workqueue) {
 812                 dev_err(dev, "cannot create workqueue\n");
 813                 ret = -ENOMEM;
 814                 goto free_resources;
 815         }
 816
 817         platform_set_drvdata(pdev, rproc);
 818
 819         ret = stm32_rproc_request_mbox(rproc);
 820         if (ret)
 821                 goto free_wkq;
 822
 823         ret = rproc_add(rproc);
 824         if (ret)
 825                 goto free_mb;
 826
 827         return 0;
 828
 829 free_mb:
 830         stm32_rproc_free_mbox(rproc);
 831 free_wkq:
 832         destroy_workqueue(ddata->workqueue);
 833 free_resources:
 834         rproc_resource_cleanup(rproc);
 835 free_rproc:
 836         if (device_may_wakeup(dev)) {
 837                 dev_pm_clear_wake_irq(dev);
 838                 device_init_wakeup(dev, false);
 839         }
 840         rproc_free(rproc);
 841         return ret;
 842 }
 843
 844 static int stm32_rproc_remove(struct platform_device *pdev)
 845 {
 846         struct rproc *rproc = platform_get_drvdata(pdev);
 847         struct stm32_rproc *ddata = rproc->priv;
 848         struct device *dev = &pdev->dev;
 849
 850         if (atomic_read(&rproc->power) > 0)
 851                 rproc_shutdown(rproc);
 852
 853         rproc_del(rproc);
 854         stm32_rproc_free_mbox(rproc);
 855         destroy_workqueue(ddata->workqueue);
 856
 857         if (device_may_wakeup(dev)) {
 858                 dev_pm_clear_wake_irq(dev);
 859                 device_init_wakeup(dev, false);
 860         }
 861         rproc_free(rproc);
 862
 863         return 0;
 864 }
 865
 866 static int __maybe_unused stm32_rproc_suspend(struct device *dev)
 867 {
 868         struct rproc *rproc = dev_get_drvdata(dev);
 869         struct stm32_rproc *ddata = rproc->priv;
 870
 871         if (device_may_wakeup(dev))
 872                 return enable_irq_wake(ddata->wdg_irq);
 873
 874         return 0;
 875 }
 876
 877 static int __maybe_unused stm32_rproc_resume(struct device *dev)
 878 {
 879         struct rproc *rproc = dev_get_drvdata(dev);
 880         struct stm32_rproc *ddata = rproc->priv;
 881
 882         if (device_may_wakeup(dev))
 883                 return disable_irq_wake(ddata->wdg_irq);
 884
 885         return 0;
 886 }
 887
 888 static SIMPLE_DEV_PM_OPS(stm32_rproc_pm_ops,
 889                          stm32_rproc_suspend, stm32_rproc_resume);
 890
 891 static struct platform_driver stm32_rproc_driver = {
 892         .probe = stm32_rproc_probe,
 893         .remove = stm32_rproc_remove,
 894         .driver = {
 895                 .name = "stm32-rproc",
 896                 .pm = &stm32_rproc_pm_ops,
 897                 .of_match_table = of_match_ptr(stm32_rproc_match),
 898         },
 899 };
 900 module_platform_driver(stm32_rproc_driver);
 901
 902 MODULE_DESCRIPTION("STM32 Remote Processor Control Driver");
 903 MODULE_AUTHOR("Ludovic Barre <ludovic.barre@st.com>");
 904 MODULE_AUTHOR("Fabien Dessenne <fabien.dessenne@st.com>");
 905 MODULE_LICENSE("GPL v2");
 906