drivers/remoteproc/mtk_scp.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 //
   3 // Copyright (c) 2019 MediaTek Inc.
   4
   5 #include <asm/barrier.h>
   6 #include <linux/clk.h>
   7 #include <linux/dma-mapping.h>
   8 #include <linux/err.h>
   9 #include <linux/interrupt.h>
  10 #include <linux/kernel.h>
  11 #include <linux/module.h>
  12 #include <linux/of_address.h>
  13 #include <linux/of_platform.h>
  14 #include <linux/of_reserved_mem.h>
  15 #include <linux/platform_device.h>
  16 #include <linux/remoteproc.h>
  17 #include <linux/remoteproc/mtk_scp.h>
  18 #include <linux/rpmsg/mtk_rpmsg.h>
  19
  20 #include "mtk_common.h"
  21 #include "remoteproc_internal.h"
  22
  23 #define MAX_CODE_SIZE 0x500000
  24 #define SCP_FW_END 0x7C000
  25
  26 /**
  27  * scp_get() - get a reference to SCP.
  28  *
  29  * @pdev:       the platform device of the module requesting SCP platform
  30  *              device for using SCP API.
  31  *
  32  * Return: Return NULL if failed.  otherwise reference to SCP.
  33  **/
  34 struct mtk_scp *scp_get(struct platform_device *pdev)
  35 {
  36         struct device *dev = &pdev->dev;
  37         struct device_node *scp_node;
  38         struct platform_device *scp_pdev;
  39
  40         scp_node = of_parse_phandle(dev->of_node, "mediatek,scp", 0);
  41         if (!scp_node) {
  42                 dev_err(dev, "can't get SCP node\n");
  43                 return NULL;
  44         }
  45
  46         scp_pdev = of_find_device_by_node(scp_node);
  47         of_node_put(scp_node);
  48
  49         if (WARN_ON(!scp_pdev)) {
  50                 dev_err(dev, "SCP pdev failed\n");
  51                 return NULL;
  52         }
  53
  54         return platform_get_drvdata(scp_pdev);
  55 }
  56 EXPORT_SYMBOL_GPL(scp_get);
  57
  58 /**
  59  * scp_put() - "free" the SCP
  60  *
  61  * @scp:        mtk_scp structure from scp_get().
  62  **/
  63 void scp_put(struct mtk_scp *scp)
  64 {
  65         put_device(scp->dev);
  66 }
  67 EXPORT_SYMBOL_GPL(scp_put);
  68
  69 static void scp_wdt_handler(struct mtk_scp *scp, u32 scp_to_host)
  70 {
  71         dev_err(scp->dev, "SCP watchdog timeout! 0x%x", scp_to_host);
  72         rproc_report_crash(scp->rproc, RPROC_WATCHDOG);
  73 }
  74
  75 static void scp_init_ipi_handler(void *data, unsigned int len, void *priv)
  76 {
  77         struct mtk_scp *scp = (struct mtk_scp *)priv;
  78         struct scp_run *run = (struct scp_run *)data;
  79
  80         scp->run.signaled = run->signaled;
  81         strscpy(scp->run.fw_ver, run->fw_ver, SCP_FW_VER_LEN);
  82         scp->run.dec_capability = run->dec_capability;
  83         scp->run.enc_capability = run->enc_capability;
  84         wake_up_interruptible(&scp->run.wq);
  85 }
  86
  87 static void scp_ipi_handler(struct mtk_scp *scp)
  88 {
  89         struct mtk_share_obj __iomem *rcv_obj = scp->recv_buf;
  90         struct scp_ipi_desc *ipi_desc = scp->ipi_desc;
  91         u8 tmp_data[SCP_SHARE_BUFFER_SIZE];
  92         scp_ipi_handler_t handler;
  93         u32 id = readl(&rcv_obj->id);
  94         u32 len = readl(&rcv_obj->len);
  95
  96         if (len > SCP_SHARE_BUFFER_SIZE) {
  97                 dev_err(scp->dev, "ipi message too long (len %d, max %d)", len,
  98                         SCP_SHARE_BUFFER_SIZE);
  99                 return;
 100         }
 101         if (id >= SCP_IPI_MAX) {
 102                 dev_err(scp->dev, "No such ipi id = %d\n", id);
 103                 return;
 104         }
 105
 106         scp_ipi_lock(scp, id);
 107         handler = ipi_desc[id].handler;
 108         if (!handler) {
 109                 dev_err(scp->dev, "No such ipi id = %d\n", id);
 110                 scp_ipi_unlock(scp, id);
 111                 return;
 112         }
 113
 114         memcpy_fromio(tmp_data, &rcv_obj->share_buf, len);
 115         handler(tmp_data, len, ipi_desc[id].priv);
 116         scp_ipi_unlock(scp, id);
 117
 118         scp->ipi_id_ack[id] = true;
 119         wake_up(&scp->ack_wq);
 120 }
 121
 122 static int scp_ipi_init(struct mtk_scp *scp)
 123 {
 124         size_t send_offset = SCP_FW_END - sizeof(struct mtk_share_obj);
 125         size_t recv_offset = send_offset - sizeof(struct mtk_share_obj);
 126
 127         /* Disable SCP to host interrupt */
 128         writel(MT8183_SCP_IPC_INT_BIT, scp->reg_base + MT8183_SCP_TO_HOST);
 129
 130         /* shared buffer initialization */
 131         scp->recv_buf =
 132                 (struct mtk_share_obj __iomem *)(scp->sram_base + recv_offset);
 133         scp->send_buf =
 134                 (struct mtk_share_obj __iomem *)(scp->sram_base + send_offset);
 135         memset_io(scp->recv_buf, 0, sizeof(scp->recv_buf));
 136         memset_io(scp->send_buf, 0, sizeof(scp->send_buf));
 137
 138         return 0;
 139 }
 140
 141 static void scp_reset_assert(const struct mtk_scp *scp)
 142 {
 143         u32 val;
 144
 145         val = readl(scp->reg_base + MT8183_SW_RSTN);
 146         val &= ~MT8183_SW_RSTN_BIT;
 147         writel(val, scp->reg_base + MT8183_SW_RSTN);
 148 }
 149
 150 static void scp_reset_deassert(const struct mtk_scp *scp)
 151 {
 152         u32 val;
 153
 154         val = readl(scp->reg_base + MT8183_SW_RSTN);
 155         val |= MT8183_SW_RSTN_BIT;
 156         writel(val, scp->reg_base + MT8183_SW_RSTN);
 157 }
 158
 159 static irqreturn_t scp_irq_handler(int irq, void *priv)
 160 {
 161         struct mtk_scp *scp = priv;
 162         u32 scp_to_host;
 163         int ret;
 164
 165         ret = clk_prepare_enable(scp->clk);
 166         if (ret) {
 167                 dev_err(scp->dev, "failed to enable clocks\n");
 168                 return IRQ_NONE;
 169         }
 170
 171         scp_to_host = readl(scp->reg_base + MT8183_SCP_TO_HOST);
 172         if (scp_to_host & MT8183_SCP_IPC_INT_BIT)
 173                 scp_ipi_handler(scp);
 174         else
 175                 scp_wdt_handler(scp, scp_to_host);
 176
 177         /* SCP won't send another interrupt until we set SCP_TO_HOST to 0. */
 178         writel(MT8183_SCP_IPC_INT_BIT | MT8183_SCP_WDT_INT_BIT,
 179                scp->reg_base + MT8183_SCP_TO_HOST);
 180         clk_disable_unprepare(scp->clk);
 181
 182         return IRQ_HANDLED;
 183 }
 184
 185 static int scp_elf_load_segments(struct rproc *rproc, const struct firmware *fw)
 186 {
 187         struct device *dev = &rproc->dev;
 188         struct elf32_hdr *ehdr;
 189         struct elf32_phdr *phdr;
 190         int i, ret = 0;
 191         const u8 *elf_data = fw->data;
 192
 193         ehdr = (struct elf32_hdr *)elf_data;
 194         phdr = (struct elf32_phdr *)(elf_data + ehdr->e_phoff);
 195
 196         /* go through the available ELF segments */
 197         for (i = 0; i < ehdr->e_phnum; i++, phdr++) {
 198                 u32 da = phdr->p_paddr;
 199                 u32 memsz = phdr->p_memsz;
 200                 u32 filesz = phdr->p_filesz;
 201                 u32 offset = phdr->p_offset;
 202                 void __iomem *ptr;
 203
 204                 if (phdr->p_type != PT_LOAD)
 205                         continue;
 206
 207                 dev_dbg(dev, "phdr: type %d da 0x%x memsz 0x%x filesz 0x%x\n",
 208                         phdr->p_type, da, memsz, filesz);
 209
 210                 if (filesz > memsz) {
 211                         dev_err(dev, "bad phdr filesz 0x%x memsz 0x%x\n",
 212                                 filesz, memsz);
 213                         ret = -EINVAL;
 214                         break;
 215                 }
 216
 217                 if (offset + filesz > fw->size) {
 218                         dev_err(dev, "truncated fw: need 0x%x avail 0x%zx\n",
 219                                 offset + filesz, fw->size);
 220                         ret = -EINVAL;
 221                         break;
 222                 }
 223
 224                 /* grab the kernel address for this device address */
 225                 ptr = (void __iomem *)rproc_da_to_va(rproc, da, memsz);
 226                 if (!ptr) {
 227                         dev_err(dev, "bad phdr da 0x%x mem 0x%x\n", da, memsz);
 228                         ret = -EINVAL;
 229                         break;
 230                 }
 231
 232                 /* put the segment where the remote processor expects it */
 233                 if (phdr->p_filesz)
 234                         scp_memcpy_aligned(ptr, elf_data + phdr->p_offset,
 235                                            filesz);
 236         }
 237
 238         return ret;
 239 }
 240
 241 static int scp_load(struct rproc *rproc, const struct firmware *fw)
 242 {
 243         const struct mtk_scp *scp = rproc->priv;
 244         struct device *dev = scp->dev;
 245         int ret;
 246
 247         ret = clk_prepare_enable(scp->clk);
 248         if (ret) {
 249                 dev_err(dev, "failed to enable clocks\n");
 250                 return ret;
 251         }
 252
 253         /* Hold SCP in reset while loading FW. */
 254         scp_reset_assert(scp);
 255
 256         /* Reset clocks before loading FW */
 257         writel(0x0, scp->reg_base + MT8183_SCP_CLK_SW_SEL);
 258         writel(0x0, scp->reg_base + MT8183_SCP_CLK_DIV_SEL);
 259
 260         /* Initialize TCM before loading FW. */
 261         writel(0x0, scp->reg_base + MT8183_SCP_L1_SRAM_PD);
 262         writel(0x0, scp->reg_base + MT8183_SCP_TCM_TAIL_SRAM_PD);
 263
 264         /* Turn on the power of SCP's SRAM before using it. */
 265         writel(0x0, scp->reg_base + MT8183_SCP_SRAM_PDN);
 266
 267         /*
 268          * Set I-cache and D-cache size before loading SCP FW.
 269          * SCP SRAM logical address may change when cache size setting differs.
 270          */
 271         writel(MT8183_SCP_CACHE_CON_WAYEN | MT8183_SCP_CACHESIZE_8KB,
 272                scp->reg_base + MT8183_SCP_CACHE_CON);
 273         writel(MT8183_SCP_CACHESIZE_8KB, scp->reg_base + MT8183_SCP_DCACHE_CON);
 274
 275         ret = scp_elf_load_segments(rproc, fw);
 276         clk_disable_unprepare(scp->clk);
 277
 278         return ret;
 279 }
 280
 281 static int scp_start(struct rproc *rproc)
 282 {
 283         struct mtk_scp *scp = (struct mtk_scp *)rproc->priv;
 284         struct device *dev = scp->dev;
 285         struct scp_run *run = &scp->run;
 286         int ret;
 287
 288         ret = clk_prepare_enable(scp->clk);
 289         if (ret) {
 290                 dev_err(dev, "failed to enable clocks\n");
 291                 return ret;
 292         }
 293
 294         run->signaled = false;
 295
 296         scp_reset_deassert(scp);
 297
 298         ret = wait_event_interruptible_timeout(
 299                                         run->wq,
 300                                         run->signaled,
 301                                         msecs_to_jiffies(2000));
 302
 303         if (ret == 0) {
 304                 dev_err(dev, "wait SCP initialization timeout!\n");
 305                 ret = -ETIME;
 306                 goto stop;
 307         }
 308         if (ret == -ERESTARTSYS) {
 309                 dev_err(dev, "wait SCP interrupted by a signal!\n");
 310                 goto stop;
 311         }
 312         clk_disable_unprepare(scp->clk);
 313         dev_info(dev, "SCP is ready. FW version %s\n", run->fw_ver);
 314
 315         return 0;
 316
 317 stop:
 318         scp_reset_assert(scp);
 319         clk_disable_unprepare(scp->clk);
 320         return ret;
 321 }
 322
 323 static void *scp_da_to_va(struct rproc *rproc, u64 da, size_t len)
 324 {
 325         struct mtk_scp *scp = (struct mtk_scp *)rproc->priv;
 326         int offset;
 327
 328         if (da < scp->sram_size) {
 329                 offset = da;
 330                 if (offset >= 0 && (offset + len) < scp->sram_size)
 331                         return (void __force *)scp->sram_base + offset;
 332         } else {
 333                 offset = da - scp->phys_addr;
 334                 if (offset >= 0 && (offset + len) < scp->dram_size)
 335                         return (void __force *)scp->cpu_addr + offset;
 336         }
 337
 338         return NULL;
 339 }
 340
 341 static int scp_stop(struct rproc *rproc)
 342 {
 343         struct mtk_scp *scp = (struct mtk_scp *)rproc->priv;
 344         int ret;
 345
 346         ret = clk_prepare_enable(scp->clk);
 347         if (ret) {
 348                 dev_err(scp->dev, "failed to enable clocks\n");
 349                 return ret;
 350         }
 351
 352         scp_reset_assert(scp);
 353         /* Disable SCP watchdog */
 354         writel(0, scp->reg_base + MT8183_WDT_CFG);
 355         clk_disable_unprepare(scp->clk);
 356
 357         return 0;
 358 }
 359
 360 static const struct rproc_ops scp_ops = {
 361         .start          = scp_start,
 362         .stop           = scp_stop,
 363         .load           = scp_load,
 364         .da_to_va       = scp_da_to_va,
 365 };
 366
 367 /**
 368  * scp_get_device() - get device struct of SCP
 369  *
 370  * @scp:        mtk_scp structure
 371  **/
 372 struct device *scp_get_device(struct mtk_scp *scp)
 373 {
 374         return scp->dev;
 375 }
 376 EXPORT_SYMBOL_GPL(scp_get_device);
 377
 378 /**
 379  * scp_get_rproc() - get rproc struct of SCP
 380  *
 381  * @scp:        mtk_scp structure
 382  **/
 383 struct rproc *scp_get_rproc(struct mtk_scp *scp)
 384 {
 385         return scp->rproc;
 386 }
 387 EXPORT_SYMBOL_GPL(scp_get_rproc);
 388
 389 /**
 390  * scp_get_vdec_hw_capa() - get video decoder hardware capability
 391  *
 392  * @scp:        mtk_scp structure
 393  *
 394  * Return: video decoder hardware capability
 395  **/
 396 unsigned int scp_get_vdec_hw_capa(struct mtk_scp *scp)
 397 {
 398         return scp->run.dec_capability;
 399 }
 400 EXPORT_SYMBOL_GPL(scp_get_vdec_hw_capa);
 401
 402 /**
 403  * scp_get_venc_hw_capa() - get video encoder hardware capability
 404  *
 405  * @scp:        mtk_scp structure
 406  *
 407  * Return: video encoder hardware capability
 408  **/
 409 unsigned int scp_get_venc_hw_capa(struct mtk_scp *scp)
 410 {
 411         return scp->run.enc_capability;
 412 }
 413 EXPORT_SYMBOL_GPL(scp_get_venc_hw_capa);
 414
 415 /**
 416  * scp_mapping_dm_addr() - Mapping SRAM/DRAM to kernel virtual address
 417  *
 418  * @scp:        mtk_scp structure
 419  * @mem_addr:   SCP views memory address
 420  *
 421  * Mapping the SCP's SRAM address /
 422  * DMEM (Data Extended Memory) memory address /
 423  * Working buffer memory address to
 424  * kernel virtual address.
 425  *
 426  * Return: Return ERR_PTR(-EINVAL) if mapping failed,
 427  * otherwise the mapped kernel virtual address
 428  **/
 429 void *scp_mapping_dm_addr(struct mtk_scp *scp, u32 mem_addr)
 430 {
 431         void *ptr;
 432
 433         ptr = scp_da_to_va(scp->rproc, mem_addr, 0);
 434         if (!ptr)
 435                 return ERR_PTR(-EINVAL);
 436
 437         return ptr;
 438 }
 439 EXPORT_SYMBOL_GPL(scp_mapping_dm_addr);
 440
 441 static int scp_map_memory_region(struct mtk_scp *scp)
 442 {
 443         int ret;
 444
 445         ret = of_reserved_mem_device_init(scp->dev);
 446         if (ret) {
 447                 dev_err(scp->dev, "failed to assign memory-region: %d\n", ret);
 448                 return -ENOMEM;
 449         }
 450
 451         /* Reserved SCP code size */
 452         scp->dram_size = MAX_CODE_SIZE;
 453         scp->cpu_addr = dma_alloc_coherent(scp->dev, scp->dram_size,
 454                                            &scp->phys_addr, GFP_KERNEL);
 455         if (!scp->cpu_addr)
 456                 return -ENOMEM;
 457
 458         return 0;
 459 }
 460
 461 static void scp_unmap_memory_region(struct mtk_scp *scp)
 462 {
 463         dma_free_coherent(scp->dev, scp->dram_size, scp->cpu_addr,
 464                           scp->phys_addr);
 465         of_reserved_mem_device_release(scp->dev);
 466 }
 467
 468 static int scp_register_ipi(struct platform_device *pdev, u32 id,
 469                             ipi_handler_t handler, void *priv)
 470 {
 471         struct mtk_scp *scp = platform_get_drvdata(pdev);
 472
 473         return scp_ipi_register(scp, id, handler, priv);
 474 }
 475
 476 static void scp_unregister_ipi(struct platform_device *pdev, u32 id)
 477 {
 478         struct mtk_scp *scp = platform_get_drvdata(pdev);
 479
 480         scp_ipi_unregister(scp, id);
 481 }
 482
 483 static int scp_send_ipi(struct platform_device *pdev, u32 id, void *buf,
 484                         unsigned int len, unsigned int wait)
 485 {
 486         struct mtk_scp *scp = platform_get_drvdata(pdev);
 487
 488         return scp_ipi_send(scp, id, buf, len, wait);
 489 }
 490
 491 static struct mtk_rpmsg_info mtk_scp_rpmsg_info = {
 492         .send_ipi = scp_send_ipi,
 493         .register_ipi = scp_register_ipi,
 494         .unregister_ipi = scp_unregister_ipi,
 495         .ns_ipi_id = SCP_IPI_NS_SERVICE,
 496 };
 497
 498 static void scp_add_rpmsg_subdev(struct mtk_scp *scp)
 499 {
 500         scp->rpmsg_subdev =
 501                 mtk_rpmsg_create_rproc_subdev(to_platform_device(scp->dev),
 502                                               &mtk_scp_rpmsg_info);
 503         if (scp->rpmsg_subdev)
 504                 rproc_add_subdev(scp->rproc, scp->rpmsg_subdev);
 505 }
 506
 507 static void scp_remove_rpmsg_subdev(struct mtk_scp *scp)
 508 {
 509         if (scp->rpmsg_subdev) {
 510                 rproc_remove_subdev(scp->rproc, scp->rpmsg_subdev);
 511                 mtk_rpmsg_destroy_rproc_subdev(scp->rpmsg_subdev);
 512                 scp->rpmsg_subdev = NULL;
 513         }
 514 }
 515
 516 static int scp_probe(struct platform_device *pdev)
 517 {
 518         struct device *dev = &pdev->dev;
 519         struct device_node *np = dev->of_node;
 520         struct mtk_scp *scp;
 521         struct rproc *rproc;
 522         struct resource *res;
 523         char *fw_name = "scp.img";
 524         int ret, i;
 525
 526         rproc = rproc_alloc(dev,
 527                             np->name,
 528                             &scp_ops,
 529                             fw_name,
 530                             sizeof(*scp));
 531         if (!rproc) {
 532                 dev_err(dev, "unable to allocate remoteproc\n");
 533                 return -ENOMEM;
 534         }
 535
 536         scp = (struct mtk_scp *)rproc->priv;
 537         scp->rproc = rproc;
 538         scp->dev = dev;
 539         platform_set_drvdata(pdev, scp);
 540
 541         res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "sram");
 542         scp->sram_base = devm_ioremap_resource(dev, res);
 543         if (IS_ERR((__force void *)scp->sram_base)) {
 544                 dev_err(dev, "Failed to parse and map sram memory\n");
 545                 ret = PTR_ERR((__force void *)scp->sram_base);
 546                 goto free_rproc;
 547         }
 548         scp->sram_size = resource_size(res);
 549
 550         mutex_init(&scp->send_lock);
 551         for (i = 0; i < SCP_IPI_MAX; i++)
 552                 mutex_init(&scp->ipi_desc[i].lock);
 553
 554         res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "cfg");
 555         scp->reg_base = devm_ioremap_resource(dev, res);
 556         if (IS_ERR((__force void *)scp->reg_base)) {
 557                 dev_err(dev, "Failed to parse and map cfg memory\n");
 558                 ret = PTR_ERR((__force void *)scp->reg_base);
 559                 goto destroy_mutex;
 560         }
 561
 562         ret = scp_map_memory_region(scp);
 563         if (ret)
 564                 goto destroy_mutex;
 565
 566         scp->clk = devm_clk_get(dev, "main");
 567         if (IS_ERR(scp->clk)) {
 568                 dev_err(dev, "Failed to get clock\n");
 569                 ret = PTR_ERR(scp->clk);
 570                 goto release_dev_mem;
 571         }
 572
 573         ret = clk_prepare_enable(scp->clk);
 574         if (ret) {
 575                 dev_err(dev, "failed to enable clocks\n");
 576                 goto release_dev_mem;
 577         }
 578
 579         ret = scp_ipi_init(scp);
 580         clk_disable_unprepare(scp->clk);
 581         if (ret) {
 582                 dev_err(dev, "Failed to init ipi\n");
 583                 goto release_dev_mem;
 584         }
 585
 586         /* register SCP initialization IPI */
 587         ret = scp_ipi_register(scp, SCP_IPI_INIT, scp_init_ipi_handler, scp);
 588         if (ret) {
 589                 dev_err(dev, "Failed to register IPI_SCP_INIT\n");
 590                 goto release_dev_mem;
 591         }
 592
 593         init_waitqueue_head(&scp->run.wq);
 594         init_waitqueue_head(&scp->ack_wq);
 595
 596         scp_add_rpmsg_subdev(scp);
 597
 598         ret = devm_request_threaded_irq(dev, platform_get_irq(pdev, 0), NULL,
 599                                         scp_irq_handler, IRQF_ONESHOT,
 600                                         pdev->name, scp);
 601
 602         if (ret) {
 603                 dev_err(dev, "failed to request irq\n");
 604                 goto remove_subdev;
 605         }
 606
 607         ret = rproc_add(rproc);
 608         if (ret)
 609                 goto remove_subdev;
 610
 611         return 0;
 612
 613 remove_subdev:
 614         scp_remove_rpmsg_subdev(scp);
 615         scp_ipi_unregister(scp, SCP_IPI_INIT);
 616 release_dev_mem:
 617         scp_unmap_memory_region(scp);
 618 destroy_mutex:
 619         for (i = 0; i < SCP_IPI_MAX; i++)
 620                 mutex_destroy(&scp->ipi_desc[i].lock);
 621         mutex_destroy(&scp->send_lock);
 622 free_rproc:
 623         rproc_free(rproc);
 624
 625         return ret;
 626 }
 627
 628 static int scp_remove(struct platform_device *pdev)
 629 {
 630         struct mtk_scp *scp = platform_get_drvdata(pdev);
 631         int i;
 632
 633         rproc_del(scp->rproc);
 634         scp_remove_rpmsg_subdev(scp);
 635         scp_ipi_unregister(scp, SCP_IPI_INIT);
 636         scp_unmap_memory_region(scp);
 637         for (i = 0; i < SCP_IPI_MAX; i++)
 638                 mutex_destroy(&scp->ipi_desc[i].lock);
 639         mutex_destroy(&scp->send_lock);
 640         rproc_free(scp->rproc);
 641
 642         return 0;
 643 }
 644
 645 static const struct of_device_id mtk_scp_of_match[] = {
 646         { .compatible = "mediatek,mt8183-scp"},
 647         {},
 648 };
 649 MODULE_DEVICE_TABLE(of, mtk_scp_of_match);
 650
 651 static struct platform_driver mtk_scp_driver = {
 652         .probe = scp_probe,
 653         .remove = scp_remove,
 654         .driver = {
 655                 .name = "mtk-scp",
 656                 .of_match_table = of_match_ptr(mtk_scp_of_match),
 657         },
 658 };
 659
 660 module_platform_driver(mtk_scp_driver);
 661
 662 MODULE_LICENSE("GPL v2");
 663 MODULE_DESCRIPTION("MediaTek SCP control driver");