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 SECTION_NAME_IPI_BUFFER ".ipi_buffer" 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_elf_read_ipi_buf_addr(struct mtk_scp *scp, 123 const struct firmware *fw, 124 size_t *offset); 125 126 static int scp_ipi_init(struct mtk_scp *scp, const struct firmware *fw) 127 { 128 int ret; 129 size_t offset; 130 131 /* read the ipi buf addr from FW itself first */ 132 ret = scp_elf_read_ipi_buf_addr(scp, fw, &offset); 133 if (ret) { 134 /* use default ipi buf addr if the FW doesn't have it */ 135 offset = scp->data->ipi_buf_offset; 136 if (!offset) 137 return ret; 138 } 139 dev_info(scp->dev, "IPI buf addr %#010zx\n", offset); 140 141 scp->recv_buf = (struct mtk_share_obj __iomem *) 142 (scp->sram_base + offset); 143 scp->send_buf = (struct mtk_share_obj __iomem *) 144 (scp->sram_base + offset + sizeof(*scp->recv_buf)); 145 memset_io(scp->recv_buf, 0, sizeof(*scp->recv_buf)); 146 memset_io(scp->send_buf, 0, sizeof(*scp->send_buf)); 147 148 return 0; 149 } 150 151 static void mt8183_scp_reset_assert(struct mtk_scp *scp) 152 { 153 u32 val; 154 155 val = readl(scp->reg_base + MT8183_SW_RSTN); 156 val &= ~MT8183_SW_RSTN_BIT; 157 writel(val, scp->reg_base + MT8183_SW_RSTN); 158 } 159 160 static void mt8183_scp_reset_deassert(struct mtk_scp *scp) 161 { 162 u32 val; 163 164 val = readl(scp->reg_base + MT8183_SW_RSTN); 165 val |= MT8183_SW_RSTN_BIT; 166 writel(val, scp->reg_base + MT8183_SW_RSTN); 167 } 168 169 static void mt8192_scp_reset_assert(struct mtk_scp *scp) 170 { 171 writel(1, scp->reg_base + MT8192_CORE0_SW_RSTN_SET); 172 } 173 174 static void mt8192_scp_reset_deassert(struct mtk_scp *scp) 175 { 176 writel(1, scp->reg_base + MT8192_CORE0_SW_RSTN_CLR); 177 } 178 179 static void mt8183_scp_irq_handler(struct mtk_scp *scp) 180 { 181 u32 scp_to_host; 182 183 scp_to_host = readl(scp->reg_base + MT8183_SCP_TO_HOST); 184 if (scp_to_host & MT8183_SCP_IPC_INT_BIT) 185 scp_ipi_handler(scp); 186 else 187 scp_wdt_handler(scp, scp_to_host); 188 189 /* SCP won't send another interrupt until we set SCP_TO_HOST to 0. */ 190 writel(MT8183_SCP_IPC_INT_BIT | MT8183_SCP_WDT_INT_BIT, 191 scp->reg_base + MT8183_SCP_TO_HOST); 192 } 193 194 static void mt8192_scp_irq_handler(struct mtk_scp *scp) 195 { 196 u32 scp_to_host; 197 198 scp_to_host = readl(scp->reg_base + MT8192_SCP2APMCU_IPC_SET); 199 200 if (scp_to_host & MT8192_SCP_IPC_INT_BIT) { 201 scp_ipi_handler(scp); 202 203 /* 204 * SCP won't send another interrupt until we clear 205 * MT8192_SCP2APMCU_IPC. 206 */ 207 writel(MT8192_SCP_IPC_INT_BIT, 208 scp->reg_base + MT8192_SCP2APMCU_IPC_CLR); 209 } else { 210 scp_wdt_handler(scp, scp_to_host); 211 writel(1, scp->reg_base + MT8192_CORE0_WDT_IRQ); 212 } 213 } 214 215 static irqreturn_t scp_irq_handler(int irq, void *priv) 216 { 217 struct mtk_scp *scp = priv; 218 int ret; 219 220 ret = clk_prepare_enable(scp->clk); 221 if (ret) { 222 dev_err(scp->dev, "failed to enable clocks\n"); 223 return IRQ_NONE; 224 } 225 226 scp->data->scp_irq_handler(scp); 227 228 clk_disable_unprepare(scp->clk); 229 230 return IRQ_HANDLED; 231 } 232 233 static int scp_elf_load_segments(struct rproc *rproc, const struct firmware *fw) 234 { 235 struct device *dev = &rproc->dev; 236 struct elf32_hdr *ehdr; 237 struct elf32_phdr *phdr; 238 int i, ret = 0; 239 const u8 *elf_data = fw->data; 240 241 ehdr = (struct elf32_hdr *)elf_data; 242 phdr = (struct elf32_phdr *)(elf_data + ehdr->e_phoff); 243 244 /* go through the available ELF segments */ 245 for (i = 0; i < ehdr->e_phnum; i++, phdr++) { 246 u32 da = phdr->p_paddr; 247 u32 memsz = phdr->p_memsz; 248 u32 filesz = phdr->p_filesz; 249 u32 offset = phdr->p_offset; 250 void __iomem *ptr; 251 252 dev_dbg(dev, "phdr: type %d da 0x%x memsz 0x%x filesz 0x%x\n", 253 phdr->p_type, da, memsz, filesz); 254 255 if (phdr->p_type != PT_LOAD) 256 continue; 257 if (!filesz) 258 continue; 259 260 if (filesz > memsz) { 261 dev_err(dev, "bad phdr filesz 0x%x memsz 0x%x\n", 262 filesz, memsz); 263 ret = -EINVAL; 264 break; 265 } 266 267 if (offset + filesz > fw->size) { 268 dev_err(dev, "truncated fw: need 0x%x avail 0x%zx\n", 269 offset + filesz, fw->size); 270 ret = -EINVAL; 271 break; 272 } 273 274 /* grab the kernel address for this device address */ 275 ptr = (void __iomem *)rproc_da_to_va(rproc, da, memsz, NULL); 276 if (!ptr) { 277 dev_err(dev, "bad phdr da 0x%x mem 0x%x\n", da, memsz); 278 ret = -EINVAL; 279 break; 280 } 281 282 /* put the segment where the remote processor expects it */ 283 scp_memcpy_aligned(ptr, elf_data + phdr->p_offset, filesz); 284 } 285 286 return ret; 287 } 288 289 static int scp_elf_read_ipi_buf_addr(struct mtk_scp *scp, 290 const struct firmware *fw, 291 size_t *offset) 292 { 293 struct elf32_hdr *ehdr; 294 struct elf32_shdr *shdr, *shdr_strtab; 295 int i; 296 const u8 *elf_data = fw->data; 297 const char *strtab; 298 299 ehdr = (struct elf32_hdr *)elf_data; 300 shdr = (struct elf32_shdr *)(elf_data + ehdr->e_shoff); 301 shdr_strtab = shdr + ehdr->e_shstrndx; 302 strtab = (const char *)(elf_data + shdr_strtab->sh_offset); 303 304 for (i = 0; i < ehdr->e_shnum; i++, shdr++) { 305 if (strcmp(strtab + shdr->sh_name, 306 SECTION_NAME_IPI_BUFFER) == 0) { 307 *offset = shdr->sh_addr; 308 return 0; 309 } 310 } 311 312 return -ENOENT; 313 } 314 315 static int mt8183_scp_before_load(struct mtk_scp *scp) 316 { 317 /* Clear SCP to host interrupt */ 318 writel(MT8183_SCP_IPC_INT_BIT, scp->reg_base + MT8183_SCP_TO_HOST); 319 320 /* Reset clocks before loading FW */ 321 writel(0x0, scp->reg_base + MT8183_SCP_CLK_SW_SEL); 322 writel(0x0, scp->reg_base + MT8183_SCP_CLK_DIV_SEL); 323 324 /* Initialize TCM before loading FW. */ 325 writel(0x0, scp->reg_base + MT8183_SCP_L1_SRAM_PD); 326 writel(0x0, scp->reg_base + MT8183_SCP_TCM_TAIL_SRAM_PD); 327 328 /* Turn on the power of SCP's SRAM before using it. */ 329 writel(0x0, scp->reg_base + MT8183_SCP_SRAM_PDN); 330 331 /* 332 * Set I-cache and D-cache size before loading SCP FW. 333 * SCP SRAM logical address may change when cache size setting differs. 334 */ 335 writel(MT8183_SCP_CACHE_CON_WAYEN | MT8183_SCP_CACHESIZE_8KB, 336 scp->reg_base + MT8183_SCP_CACHE_CON); 337 writel(MT8183_SCP_CACHESIZE_8KB, scp->reg_base + MT8183_SCP_DCACHE_CON); 338 339 return 0; 340 } 341 342 static void mt8192_power_on_sram(void __iomem *addr) 343 { 344 int i; 345 346 for (i = 31; i >= 0; i--) 347 writel(GENMASK(i, 0), addr); 348 writel(0, addr); 349 } 350 351 static void mt8192_power_off_sram(void __iomem *addr) 352 { 353 int i; 354 355 writel(0, addr); 356 for (i = 0; i < 32; i++) 357 writel(GENMASK(i, 0), addr); 358 } 359 360 static int mt8192_scp_before_load(struct mtk_scp *scp) 361 { 362 /* clear SPM interrupt, SCP2SPM_IPC_CLR */ 363 writel(0xff, scp->reg_base + MT8192_SCP2SPM_IPC_CLR); 364 365 writel(1, scp->reg_base + MT8192_CORE0_SW_RSTN_SET); 366 367 /* enable SRAM clock */ 368 mt8192_power_on_sram(scp->reg_base + MT8192_L2TCM_SRAM_PD_0); 369 mt8192_power_on_sram(scp->reg_base + MT8192_L2TCM_SRAM_PD_1); 370 mt8192_power_on_sram(scp->reg_base + MT8192_L2TCM_SRAM_PD_2); 371 mt8192_power_on_sram(scp->reg_base + MT8192_L1TCM_SRAM_PDN); 372 mt8192_power_on_sram(scp->reg_base + MT8192_CPU0_SRAM_PD); 373 374 /* enable MPU for all memory regions */ 375 writel(0xff, scp->reg_base + MT8192_CORE0_MEM_ATT_PREDEF); 376 377 return 0; 378 } 379 380 static int scp_load(struct rproc *rproc, const struct firmware *fw) 381 { 382 struct mtk_scp *scp = rproc->priv; 383 struct device *dev = scp->dev; 384 int ret; 385 386 ret = clk_prepare_enable(scp->clk); 387 if (ret) { 388 dev_err(dev, "failed to enable clocks\n"); 389 return ret; 390 } 391 392 /* Hold SCP in reset while loading FW. */ 393 scp->data->scp_reset_assert(scp); 394 395 ret = scp->data->scp_before_load(scp); 396 if (ret < 0) 397 goto leave; 398 399 ret = scp_elf_load_segments(rproc, fw); 400 leave: 401 clk_disable_unprepare(scp->clk); 402 403 return ret; 404 } 405 406 static int scp_parse_fw(struct rproc *rproc, const struct firmware *fw) 407 { 408 struct mtk_scp *scp = rproc->priv; 409 struct device *dev = scp->dev; 410 int ret; 411 412 ret = clk_prepare_enable(scp->clk); 413 if (ret) { 414 dev_err(dev, "failed to enable clocks\n"); 415 return ret; 416 } 417 418 ret = scp_ipi_init(scp, fw); 419 clk_disable_unprepare(scp->clk); 420 return ret; 421 } 422 423 static int scp_start(struct rproc *rproc) 424 { 425 struct mtk_scp *scp = (struct mtk_scp *)rproc->priv; 426 struct device *dev = scp->dev; 427 struct scp_run *run = &scp->run; 428 int ret; 429 430 ret = clk_prepare_enable(scp->clk); 431 if (ret) { 432 dev_err(dev, "failed to enable clocks\n"); 433 return ret; 434 } 435 436 run->signaled = false; 437 438 scp->data->scp_reset_deassert(scp); 439 440 ret = wait_event_interruptible_timeout( 441 run->wq, 442 run->signaled, 443 msecs_to_jiffies(2000)); 444 445 if (ret == 0) { 446 dev_err(dev, "wait SCP initialization timeout!\n"); 447 ret = -ETIME; 448 goto stop; 449 } 450 if (ret == -ERESTARTSYS) { 451 dev_err(dev, "wait SCP interrupted by a signal!\n"); 452 goto stop; 453 } 454 455 clk_disable_unprepare(scp->clk); 456 dev_info(dev, "SCP is ready. FW version %s\n", run->fw_ver); 457 458 return 0; 459 460 stop: 461 scp->data->scp_reset_assert(scp); 462 clk_disable_unprepare(scp->clk); 463 return ret; 464 } 465 466 static void *mt8183_scp_da_to_va(struct mtk_scp *scp, u64 da, size_t len) 467 { 468 int offset; 469 470 if (da < scp->sram_size) { 471 offset = da; 472 if (offset >= 0 && (offset + len) <= scp->sram_size) 473 return (void __force *)scp->sram_base + offset; 474 } else if (scp->dram_size) { 475 offset = da - scp->dma_addr; 476 if (offset >= 0 && (offset + len) <= scp->dram_size) 477 return scp->cpu_addr + offset; 478 } 479 480 return NULL; 481 } 482 483 static void *mt8192_scp_da_to_va(struct mtk_scp *scp, u64 da, size_t len) 484 { 485 int offset; 486 487 if (da >= scp->sram_phys && 488 (da + len) <= scp->sram_phys + scp->sram_size) { 489 offset = da - scp->sram_phys; 490 return (void __force *)scp->sram_base + offset; 491 } 492 493 /* optional memory region */ 494 if (scp->l1tcm_size && 495 da >= scp->l1tcm_phys && 496 (da + len) <= scp->l1tcm_phys + scp->l1tcm_size) { 497 offset = da - scp->l1tcm_phys; 498 return (void __force *)scp->l1tcm_base + offset; 499 } 500 501 /* optional memory region */ 502 if (scp->dram_size && 503 da >= scp->dma_addr && 504 (da + len) <= scp->dma_addr + scp->dram_size) { 505 offset = da - scp->dma_addr; 506 return scp->cpu_addr + offset; 507 } 508 509 return NULL; 510 } 511 512 static void *scp_da_to_va(struct rproc *rproc, u64 da, size_t len, bool *is_iomem) 513 { 514 struct mtk_scp *scp = (struct mtk_scp *)rproc->priv; 515 516 return scp->data->scp_da_to_va(scp, da, len); 517 } 518 519 static void mt8183_scp_stop(struct mtk_scp *scp) 520 { 521 /* Disable SCP watchdog */ 522 writel(0, scp->reg_base + MT8183_WDT_CFG); 523 } 524 525 static void mt8192_scp_stop(struct mtk_scp *scp) 526 { 527 /* Disable SRAM clock */ 528 mt8192_power_off_sram(scp->reg_base + MT8192_L2TCM_SRAM_PD_0); 529 mt8192_power_off_sram(scp->reg_base + MT8192_L2TCM_SRAM_PD_1); 530 mt8192_power_off_sram(scp->reg_base + MT8192_L2TCM_SRAM_PD_2); 531 mt8192_power_off_sram(scp->reg_base + MT8192_L1TCM_SRAM_PDN); 532 mt8192_power_off_sram(scp->reg_base + MT8192_CPU0_SRAM_PD); 533 534 /* Disable SCP watchdog */ 535 writel(0, scp->reg_base + MT8192_CORE0_WDT_CFG); 536 } 537 538 static int scp_stop(struct rproc *rproc) 539 { 540 struct mtk_scp *scp = (struct mtk_scp *)rproc->priv; 541 int ret; 542 543 ret = clk_prepare_enable(scp->clk); 544 if (ret) { 545 dev_err(scp->dev, "failed to enable clocks\n"); 546 return ret; 547 } 548 549 scp->data->scp_reset_assert(scp); 550 scp->data->scp_stop(scp); 551 clk_disable_unprepare(scp->clk); 552 553 return 0; 554 } 555 556 static const struct rproc_ops scp_ops = { 557 .start = scp_start, 558 .stop = scp_stop, 559 .load = scp_load, 560 .da_to_va = scp_da_to_va, 561 .parse_fw = scp_parse_fw, 562 }; 563 564 /** 565 * scp_get_device() - get device struct of SCP 566 * 567 * @scp: mtk_scp structure 568 **/ 569 struct device *scp_get_device(struct mtk_scp *scp) 570 { 571 return scp->dev; 572 } 573 EXPORT_SYMBOL_GPL(scp_get_device); 574 575 /** 576 * scp_get_rproc() - get rproc struct of SCP 577 * 578 * @scp: mtk_scp structure 579 **/ 580 struct rproc *scp_get_rproc(struct mtk_scp *scp) 581 { 582 return scp->rproc; 583 } 584 EXPORT_SYMBOL_GPL(scp_get_rproc); 585 586 /** 587 * scp_get_vdec_hw_capa() - get video decoder hardware capability 588 * 589 * @scp: mtk_scp structure 590 * 591 * Return: video decoder hardware capability 592 **/ 593 unsigned int scp_get_vdec_hw_capa(struct mtk_scp *scp) 594 { 595 return scp->run.dec_capability; 596 } 597 EXPORT_SYMBOL_GPL(scp_get_vdec_hw_capa); 598 599 /** 600 * scp_get_venc_hw_capa() - get video encoder hardware capability 601 * 602 * @scp: mtk_scp structure 603 * 604 * Return: video encoder hardware capability 605 **/ 606 unsigned int scp_get_venc_hw_capa(struct mtk_scp *scp) 607 { 608 return scp->run.enc_capability; 609 } 610 EXPORT_SYMBOL_GPL(scp_get_venc_hw_capa); 611 612 /** 613 * scp_mapping_dm_addr() - Mapping SRAM/DRAM to kernel virtual address 614 * 615 * @scp: mtk_scp structure 616 * @mem_addr: SCP views memory address 617 * 618 * Mapping the SCP's SRAM address / 619 * DMEM (Data Extended Memory) memory address / 620 * Working buffer memory address to 621 * kernel virtual address. 622 * 623 * Return: Return ERR_PTR(-EINVAL) if mapping failed, 624 * otherwise the mapped kernel virtual address 625 **/ 626 void *scp_mapping_dm_addr(struct mtk_scp *scp, u32 mem_addr) 627 { 628 void *ptr; 629 630 ptr = scp_da_to_va(scp->rproc, mem_addr, 0, NULL); 631 if (!ptr) 632 return ERR_PTR(-EINVAL); 633 634 return ptr; 635 } 636 EXPORT_SYMBOL_GPL(scp_mapping_dm_addr); 637 638 static int scp_map_memory_region(struct mtk_scp *scp) 639 { 640 int ret; 641 642 ret = of_reserved_mem_device_init(scp->dev); 643 644 /* reserved memory is optional. */ 645 if (ret == -ENODEV) { 646 dev_info(scp->dev, "skipping reserved memory initialization."); 647 return 0; 648 } 649 650 if (ret) { 651 dev_err(scp->dev, "failed to assign memory-region: %d\n", ret); 652 return -ENOMEM; 653 } 654 655 /* Reserved SCP code size */ 656 scp->dram_size = MAX_CODE_SIZE; 657 scp->cpu_addr = dma_alloc_coherent(scp->dev, scp->dram_size, 658 &scp->dma_addr, GFP_KERNEL); 659 if (!scp->cpu_addr) 660 return -ENOMEM; 661 662 return 0; 663 } 664 665 static void scp_unmap_memory_region(struct mtk_scp *scp) 666 { 667 if (scp->dram_size == 0) 668 return; 669 670 dma_free_coherent(scp->dev, scp->dram_size, scp->cpu_addr, 671 scp->dma_addr); 672 of_reserved_mem_device_release(scp->dev); 673 } 674 675 static int scp_register_ipi(struct platform_device *pdev, u32 id, 676 ipi_handler_t handler, void *priv) 677 { 678 struct mtk_scp *scp = platform_get_drvdata(pdev); 679 680 return scp_ipi_register(scp, id, handler, priv); 681 } 682 683 static void scp_unregister_ipi(struct platform_device *pdev, u32 id) 684 { 685 struct mtk_scp *scp = platform_get_drvdata(pdev); 686 687 scp_ipi_unregister(scp, id); 688 } 689 690 static int scp_send_ipi(struct platform_device *pdev, u32 id, void *buf, 691 unsigned int len, unsigned int wait) 692 { 693 struct mtk_scp *scp = platform_get_drvdata(pdev); 694 695 return scp_ipi_send(scp, id, buf, len, wait); 696 } 697 698 static struct mtk_rpmsg_info mtk_scp_rpmsg_info = { 699 .send_ipi = scp_send_ipi, 700 .register_ipi = scp_register_ipi, 701 .unregister_ipi = scp_unregister_ipi, 702 .ns_ipi_id = SCP_IPI_NS_SERVICE, 703 }; 704 705 static void scp_add_rpmsg_subdev(struct mtk_scp *scp) 706 { 707 scp->rpmsg_subdev = 708 mtk_rpmsg_create_rproc_subdev(to_platform_device(scp->dev), 709 &mtk_scp_rpmsg_info); 710 if (scp->rpmsg_subdev) 711 rproc_add_subdev(scp->rproc, scp->rpmsg_subdev); 712 } 713 714 static void scp_remove_rpmsg_subdev(struct mtk_scp *scp) 715 { 716 if (scp->rpmsg_subdev) { 717 rproc_remove_subdev(scp->rproc, scp->rpmsg_subdev); 718 mtk_rpmsg_destroy_rproc_subdev(scp->rpmsg_subdev); 719 scp->rpmsg_subdev = NULL; 720 } 721 } 722 723 static int scp_probe(struct platform_device *pdev) 724 { 725 struct device *dev = &pdev->dev; 726 struct device_node *np = dev->of_node; 727 struct mtk_scp *scp; 728 struct rproc *rproc; 729 struct resource *res; 730 char *fw_name = "scp.img"; 731 int ret, i; 732 733 rproc = rproc_alloc(dev, 734 np->name, 735 &scp_ops, 736 fw_name, 737 sizeof(*scp)); 738 if (!rproc) { 739 dev_err(dev, "unable to allocate remoteproc\n"); 740 return -ENOMEM; 741 } 742 743 scp = (struct mtk_scp *)rproc->priv; 744 scp->rproc = rproc; 745 scp->dev = dev; 746 scp->data = of_device_get_match_data(dev); 747 platform_set_drvdata(pdev, scp); 748 749 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "sram"); 750 scp->sram_base = devm_ioremap_resource(dev, res); 751 if (IS_ERR((__force void *)scp->sram_base)) { 752 dev_err(dev, "Failed to parse and map sram memory\n"); 753 ret = PTR_ERR((__force void *)scp->sram_base); 754 goto free_rproc; 755 } 756 scp->sram_size = resource_size(res); 757 scp->sram_phys = res->start; 758 759 /* l1tcm is an optional memory region */ 760 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "l1tcm"); 761 scp->l1tcm_base = devm_ioremap_resource(dev, res); 762 if (IS_ERR((__force void *)scp->l1tcm_base)) { 763 ret = PTR_ERR((__force void *)scp->l1tcm_base); 764 if (ret != -EINVAL) { 765 dev_err(dev, "Failed to map l1tcm memory\n"); 766 goto free_rproc; 767 } 768 } else { 769 scp->l1tcm_size = resource_size(res); 770 scp->l1tcm_phys = res->start; 771 } 772 773 mutex_init(&scp->send_lock); 774 for (i = 0; i < SCP_IPI_MAX; i++) 775 mutex_init(&scp->ipi_desc[i].lock); 776 777 scp->reg_base = devm_platform_ioremap_resource_byname(pdev, "cfg"); 778 if (IS_ERR((__force void *)scp->reg_base)) { 779 dev_err(dev, "Failed to parse and map cfg memory\n"); 780 ret = PTR_ERR((__force void *)scp->reg_base); 781 goto destroy_mutex; 782 } 783 784 ret = scp_map_memory_region(scp); 785 if (ret) 786 goto destroy_mutex; 787 788 scp->clk = devm_clk_get(dev, "main"); 789 if (IS_ERR(scp->clk)) { 790 dev_err(dev, "Failed to get clock\n"); 791 ret = PTR_ERR(scp->clk); 792 goto release_dev_mem; 793 } 794 795 /* register SCP initialization IPI */ 796 ret = scp_ipi_register(scp, SCP_IPI_INIT, scp_init_ipi_handler, scp); 797 if (ret) { 798 dev_err(dev, "Failed to register IPI_SCP_INIT\n"); 799 goto release_dev_mem; 800 } 801 802 init_waitqueue_head(&scp->run.wq); 803 init_waitqueue_head(&scp->ack_wq); 804 805 scp_add_rpmsg_subdev(scp); 806 807 ret = devm_request_threaded_irq(dev, platform_get_irq(pdev, 0), NULL, 808 scp_irq_handler, IRQF_ONESHOT, 809 pdev->name, scp); 810 811 if (ret) { 812 dev_err(dev, "failed to request irq\n"); 813 goto remove_subdev; 814 } 815 816 ret = rproc_add(rproc); 817 if (ret) 818 goto remove_subdev; 819 820 return 0; 821 822 remove_subdev: 823 scp_remove_rpmsg_subdev(scp); 824 scp_ipi_unregister(scp, SCP_IPI_INIT); 825 release_dev_mem: 826 scp_unmap_memory_region(scp); 827 destroy_mutex: 828 for (i = 0; i < SCP_IPI_MAX; i++) 829 mutex_destroy(&scp->ipi_desc[i].lock); 830 mutex_destroy(&scp->send_lock); 831 free_rproc: 832 rproc_free(rproc); 833 834 return ret; 835 } 836 837 static int scp_remove(struct platform_device *pdev) 838 { 839 struct mtk_scp *scp = platform_get_drvdata(pdev); 840 int i; 841 842 rproc_del(scp->rproc); 843 scp_remove_rpmsg_subdev(scp); 844 scp_ipi_unregister(scp, SCP_IPI_INIT); 845 scp_unmap_memory_region(scp); 846 for (i = 0; i < SCP_IPI_MAX; i++) 847 mutex_destroy(&scp->ipi_desc[i].lock); 848 mutex_destroy(&scp->send_lock); 849 rproc_free(scp->rproc); 850 851 return 0; 852 } 853 854 static const struct mtk_scp_of_data mt8183_of_data = { 855 .scp_before_load = mt8183_scp_before_load, 856 .scp_irq_handler = mt8183_scp_irq_handler, 857 .scp_reset_assert = mt8183_scp_reset_assert, 858 .scp_reset_deassert = mt8183_scp_reset_deassert, 859 .scp_stop = mt8183_scp_stop, 860 .scp_da_to_va = mt8183_scp_da_to_va, 861 .host_to_scp_reg = MT8183_HOST_TO_SCP, 862 .host_to_scp_int_bit = MT8183_HOST_IPC_INT_BIT, 863 .ipi_buf_offset = 0x7bdb0, 864 }; 865 866 static const struct mtk_scp_of_data mt8192_of_data = { 867 .scp_before_load = mt8192_scp_before_load, 868 .scp_irq_handler = mt8192_scp_irq_handler, 869 .scp_reset_assert = mt8192_scp_reset_assert, 870 .scp_reset_deassert = mt8192_scp_reset_deassert, 871 .scp_stop = mt8192_scp_stop, 872 .scp_da_to_va = mt8192_scp_da_to_va, 873 .host_to_scp_reg = MT8192_GIPC_IN_SET, 874 .host_to_scp_int_bit = MT8192_HOST_IPC_INT_BIT, 875 }; 876 877 static const struct of_device_id mtk_scp_of_match[] = { 878 { .compatible = "mediatek,mt8183-scp", .data = &mt8183_of_data }, 879 { .compatible = "mediatek,mt8192-scp", .data = &mt8192_of_data }, 880 {}, 881 }; 882 MODULE_DEVICE_TABLE(of, mtk_scp_of_match); 883 884 static struct platform_driver mtk_scp_driver = { 885 .probe = scp_probe, 886 .remove = scp_remove, 887 .driver = { 888 .name = "mtk-scp", 889 .of_match_table = mtk_scp_of_match, 890 }, 891 }; 892 893 module_platform_driver(mtk_scp_driver); 894 895 MODULE_LICENSE("GPL v2"); 896 MODULE_DESCRIPTION("MediaTek SCP control driver"); 897