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_elf_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_coredump_set_elf_info(rproc, ELFCLASS32, EM_NONE); 629 rproc->has_iommu = false; 630 ddata = rproc->priv; 631 ddata->workqueue = create_workqueue(dev_name(dev)); 632 if (!ddata->workqueue) { 633 dev_err(dev, "cannot create workqueue\n"); 634 ret = -ENOMEM; 635 goto free_rproc; 636 } 637 638 platform_set_drvdata(pdev, rproc); 639 640 ret = stm32_rproc_parse_dt(pdev); 641 if (ret) 642 goto free_wkq; 643 644 ret = stm32_rproc_request_mbox(rproc); 645 if (ret) 646 goto free_rproc; 647 648 ret = rproc_add(rproc); 649 if (ret) 650 goto free_mb; 651 652 return 0; 653 654 free_mb: 655 stm32_rproc_free_mbox(rproc); 656 free_wkq: 657 destroy_workqueue(ddata->workqueue); 658 free_rproc: 659 if (device_may_wakeup(dev)) { 660 dev_pm_clear_wake_irq(dev); 661 device_init_wakeup(dev, false); 662 } 663 rproc_free(rproc); 664 return ret; 665 } 666 667 static int stm32_rproc_remove(struct platform_device *pdev) 668 { 669 struct rproc *rproc = platform_get_drvdata(pdev); 670 struct stm32_rproc *ddata = rproc->priv; 671 struct device *dev = &pdev->dev; 672 673 if (atomic_read(&rproc->power) > 0) 674 rproc_shutdown(rproc); 675 676 rproc_del(rproc); 677 stm32_rproc_free_mbox(rproc); 678 destroy_workqueue(ddata->workqueue); 679 680 if (device_may_wakeup(dev)) { 681 dev_pm_clear_wake_irq(dev); 682 device_init_wakeup(dev, false); 683 } 684 rproc_free(rproc); 685 686 return 0; 687 } 688 689 static int __maybe_unused stm32_rproc_suspend(struct device *dev) 690 { 691 struct rproc *rproc = dev_get_drvdata(dev); 692 struct stm32_rproc *ddata = rproc->priv; 693 694 if (device_may_wakeup(dev)) 695 return enable_irq_wake(ddata->wdg_irq); 696 697 return 0; 698 } 699 700 static int __maybe_unused stm32_rproc_resume(struct device *dev) 701 { 702 struct rproc *rproc = dev_get_drvdata(dev); 703 struct stm32_rproc *ddata = rproc->priv; 704 705 if (device_may_wakeup(dev)) 706 return disable_irq_wake(ddata->wdg_irq); 707 708 return 0; 709 } 710 711 static SIMPLE_DEV_PM_OPS(stm32_rproc_pm_ops, 712 stm32_rproc_suspend, stm32_rproc_resume); 713 714 static struct platform_driver stm32_rproc_driver = { 715 .probe = stm32_rproc_probe, 716 .remove = stm32_rproc_remove, 717 .driver = { 718 .name = "stm32-rproc", 719 .pm = &stm32_rproc_pm_ops, 720 .of_match_table = of_match_ptr(stm32_rproc_match), 721 }, 722 }; 723 module_platform_driver(stm32_rproc_driver); 724 725 MODULE_DESCRIPTION("STM32 Remote Processor Control Driver"); 726 MODULE_AUTHOR("Ludovic Barre <ludovic.barre@st.com>"); 727 MODULE_AUTHOR("Fabien Dessenne <fabien.dessenne@st.com>"); 728 MODULE_LICENSE("GPL v2"); 729 730