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_clk_get(struct mtk_scp *scp) 316 { 317 struct device *dev = scp->dev; 318 int ret = 0; 319 320 scp->clk = devm_clk_get(dev, "main"); 321 if (IS_ERR(scp->clk)) { 322 dev_err(dev, "Failed to get clock\n"); 323 ret = PTR_ERR(scp->clk); 324 } 325 326 return ret; 327 } 328 329 static int mt8192_scp_clk_get(struct mtk_scp *scp) 330 { 331 return mt8183_scp_clk_get(scp); 332 } 333 334 static int mt8195_scp_clk_get(struct mtk_scp *scp) 335 { 336 scp->clk = NULL; 337 338 return 0; 339 } 340 341 static int mt8183_scp_before_load(struct mtk_scp *scp) 342 { 343 /* Clear SCP to host interrupt */ 344 writel(MT8183_SCP_IPC_INT_BIT, scp->reg_base + MT8183_SCP_TO_HOST); 345 346 /* Reset clocks before loading FW */ 347 writel(0x0, scp->reg_base + MT8183_SCP_CLK_SW_SEL); 348 writel(0x0, scp->reg_base + MT8183_SCP_CLK_DIV_SEL); 349 350 /* Initialize TCM before loading FW. */ 351 writel(0x0, scp->reg_base + MT8183_SCP_L1_SRAM_PD); 352 writel(0x0, scp->reg_base + MT8183_SCP_TCM_TAIL_SRAM_PD); 353 354 /* Turn on the power of SCP's SRAM before using it. */ 355 writel(0x0, scp->reg_base + MT8183_SCP_SRAM_PDN); 356 357 /* 358 * Set I-cache and D-cache size before loading SCP FW. 359 * SCP SRAM logical address may change when cache size setting differs. 360 */ 361 writel(MT8183_SCP_CACHE_CON_WAYEN | MT8183_SCP_CACHESIZE_8KB, 362 scp->reg_base + MT8183_SCP_CACHE_CON); 363 writel(MT8183_SCP_CACHESIZE_8KB, scp->reg_base + MT8183_SCP_DCACHE_CON); 364 365 return 0; 366 } 367 368 static void mt8192_power_on_sram(void __iomem *addr) 369 { 370 int i; 371 372 for (i = 31; i >= 0; i--) 373 writel(GENMASK(i, 0), addr); 374 writel(0, addr); 375 } 376 377 static void mt8192_power_off_sram(void __iomem *addr) 378 { 379 int i; 380 381 writel(0, addr); 382 for (i = 0; i < 32; i++) 383 writel(GENMASK(i, 0), addr); 384 } 385 386 static int mt8192_scp_before_load(struct mtk_scp *scp) 387 { 388 /* clear SPM interrupt, SCP2SPM_IPC_CLR */ 389 writel(0xff, scp->reg_base + MT8192_SCP2SPM_IPC_CLR); 390 391 writel(1, scp->reg_base + MT8192_CORE0_SW_RSTN_SET); 392 393 /* enable SRAM clock */ 394 mt8192_power_on_sram(scp->reg_base + MT8192_L2TCM_SRAM_PD_0); 395 mt8192_power_on_sram(scp->reg_base + MT8192_L2TCM_SRAM_PD_1); 396 mt8192_power_on_sram(scp->reg_base + MT8192_L2TCM_SRAM_PD_2); 397 mt8192_power_on_sram(scp->reg_base + MT8192_L1TCM_SRAM_PDN); 398 mt8192_power_on_sram(scp->reg_base + MT8192_CPU0_SRAM_PD); 399 400 /* enable MPU for all memory regions */ 401 writel(0xff, scp->reg_base + MT8192_CORE0_MEM_ATT_PREDEF); 402 403 return 0; 404 } 405 406 static int scp_load(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 /* Hold SCP in reset while loading FW. */ 419 scp->data->scp_reset_assert(scp); 420 421 ret = scp->data->scp_before_load(scp); 422 if (ret < 0) 423 goto leave; 424 425 ret = scp_elf_load_segments(rproc, fw); 426 leave: 427 clk_disable_unprepare(scp->clk); 428 429 return ret; 430 } 431 432 static int scp_parse_fw(struct rproc *rproc, const struct firmware *fw) 433 { 434 struct mtk_scp *scp = rproc->priv; 435 struct device *dev = scp->dev; 436 int ret; 437 438 ret = clk_prepare_enable(scp->clk); 439 if (ret) { 440 dev_err(dev, "failed to enable clocks\n"); 441 return ret; 442 } 443 444 ret = scp_ipi_init(scp, fw); 445 clk_disable_unprepare(scp->clk); 446 return ret; 447 } 448 449 static int scp_start(struct rproc *rproc) 450 { 451 struct mtk_scp *scp = (struct mtk_scp *)rproc->priv; 452 struct device *dev = scp->dev; 453 struct scp_run *run = &scp->run; 454 int ret; 455 456 ret = clk_prepare_enable(scp->clk); 457 if (ret) { 458 dev_err(dev, "failed to enable clocks\n"); 459 return ret; 460 } 461 462 run->signaled = false; 463 464 scp->data->scp_reset_deassert(scp); 465 466 ret = wait_event_interruptible_timeout( 467 run->wq, 468 run->signaled, 469 msecs_to_jiffies(2000)); 470 471 if (ret == 0) { 472 dev_err(dev, "wait SCP initialization timeout!\n"); 473 ret = -ETIME; 474 goto stop; 475 } 476 if (ret == -ERESTARTSYS) { 477 dev_err(dev, "wait SCP interrupted by a signal!\n"); 478 goto stop; 479 } 480 481 clk_disable_unprepare(scp->clk); 482 dev_info(dev, "SCP is ready. FW version %s\n", run->fw_ver); 483 484 return 0; 485 486 stop: 487 scp->data->scp_reset_assert(scp); 488 clk_disable_unprepare(scp->clk); 489 return ret; 490 } 491 492 static void *mt8183_scp_da_to_va(struct mtk_scp *scp, u64 da, size_t len) 493 { 494 int offset; 495 496 if (da < scp->sram_size) { 497 offset = da; 498 if (offset >= 0 && (offset + len) <= scp->sram_size) 499 return (void __force *)scp->sram_base + offset; 500 } else if (scp->dram_size) { 501 offset = da - scp->dma_addr; 502 if (offset >= 0 && (offset + len) <= scp->dram_size) 503 return scp->cpu_addr + offset; 504 } 505 506 return NULL; 507 } 508 509 static void *mt8192_scp_da_to_va(struct mtk_scp *scp, u64 da, size_t len) 510 { 511 int offset; 512 513 if (da >= scp->sram_phys && 514 (da + len) <= scp->sram_phys + scp->sram_size) { 515 offset = da - scp->sram_phys; 516 return (void __force *)scp->sram_base + offset; 517 } 518 519 /* optional memory region */ 520 if (scp->l1tcm_size && 521 da >= scp->l1tcm_phys && 522 (da + len) <= scp->l1tcm_phys + scp->l1tcm_size) { 523 offset = da - scp->l1tcm_phys; 524 return (void __force *)scp->l1tcm_base + offset; 525 } 526 527 /* optional memory region */ 528 if (scp->dram_size && 529 da >= scp->dma_addr && 530 (da + len) <= scp->dma_addr + scp->dram_size) { 531 offset = da - scp->dma_addr; 532 return scp->cpu_addr + offset; 533 } 534 535 return NULL; 536 } 537 538 static void *scp_da_to_va(struct rproc *rproc, u64 da, size_t len, bool *is_iomem) 539 { 540 struct mtk_scp *scp = (struct mtk_scp *)rproc->priv; 541 542 return scp->data->scp_da_to_va(scp, da, len); 543 } 544 545 static void mt8183_scp_stop(struct mtk_scp *scp) 546 { 547 /* Disable SCP watchdog */ 548 writel(0, scp->reg_base + MT8183_WDT_CFG); 549 } 550 551 static void mt8192_scp_stop(struct mtk_scp *scp) 552 { 553 /* Disable SRAM clock */ 554 mt8192_power_off_sram(scp->reg_base + MT8192_L2TCM_SRAM_PD_0); 555 mt8192_power_off_sram(scp->reg_base + MT8192_L2TCM_SRAM_PD_1); 556 mt8192_power_off_sram(scp->reg_base + MT8192_L2TCM_SRAM_PD_2); 557 mt8192_power_off_sram(scp->reg_base + MT8192_L1TCM_SRAM_PDN); 558 mt8192_power_off_sram(scp->reg_base + MT8192_CPU0_SRAM_PD); 559 560 /* Disable SCP watchdog */ 561 writel(0, scp->reg_base + MT8192_CORE0_WDT_CFG); 562 } 563 564 static int scp_stop(struct rproc *rproc) 565 { 566 struct mtk_scp *scp = (struct mtk_scp *)rproc->priv; 567 int ret; 568 569 ret = clk_prepare_enable(scp->clk); 570 if (ret) { 571 dev_err(scp->dev, "failed to enable clocks\n"); 572 return ret; 573 } 574 575 scp->data->scp_reset_assert(scp); 576 scp->data->scp_stop(scp); 577 clk_disable_unprepare(scp->clk); 578 579 return 0; 580 } 581 582 static const struct rproc_ops scp_ops = { 583 .start = scp_start, 584 .stop = scp_stop, 585 .load = scp_load, 586 .da_to_va = scp_da_to_va, 587 .parse_fw = scp_parse_fw, 588 }; 589 590 /** 591 * scp_get_device() - get device struct of SCP 592 * 593 * @scp: mtk_scp structure 594 **/ 595 struct device *scp_get_device(struct mtk_scp *scp) 596 { 597 return scp->dev; 598 } 599 EXPORT_SYMBOL_GPL(scp_get_device); 600 601 /** 602 * scp_get_rproc() - get rproc struct of SCP 603 * 604 * @scp: mtk_scp structure 605 **/ 606 struct rproc *scp_get_rproc(struct mtk_scp *scp) 607 { 608 return scp->rproc; 609 } 610 EXPORT_SYMBOL_GPL(scp_get_rproc); 611 612 /** 613 * scp_get_vdec_hw_capa() - get video decoder hardware capability 614 * 615 * @scp: mtk_scp structure 616 * 617 * Return: video decoder hardware capability 618 **/ 619 unsigned int scp_get_vdec_hw_capa(struct mtk_scp *scp) 620 { 621 return scp->run.dec_capability; 622 } 623 EXPORT_SYMBOL_GPL(scp_get_vdec_hw_capa); 624 625 /** 626 * scp_get_venc_hw_capa() - get video encoder hardware capability 627 * 628 * @scp: mtk_scp structure 629 * 630 * Return: video encoder hardware capability 631 **/ 632 unsigned int scp_get_venc_hw_capa(struct mtk_scp *scp) 633 { 634 return scp->run.enc_capability; 635 } 636 EXPORT_SYMBOL_GPL(scp_get_venc_hw_capa); 637 638 /** 639 * scp_mapping_dm_addr() - Mapping SRAM/DRAM to kernel virtual address 640 * 641 * @scp: mtk_scp structure 642 * @mem_addr: SCP views memory address 643 * 644 * Mapping the SCP's SRAM address / 645 * DMEM (Data Extended Memory) memory address / 646 * Working buffer memory address to 647 * kernel virtual address. 648 * 649 * Return: Return ERR_PTR(-EINVAL) if mapping failed, 650 * otherwise the mapped kernel virtual address 651 **/ 652 void *scp_mapping_dm_addr(struct mtk_scp *scp, u32 mem_addr) 653 { 654 void *ptr; 655 656 ptr = scp_da_to_va(scp->rproc, mem_addr, 0, NULL); 657 if (!ptr) 658 return ERR_PTR(-EINVAL); 659 660 return ptr; 661 } 662 EXPORT_SYMBOL_GPL(scp_mapping_dm_addr); 663 664 static int scp_map_memory_region(struct mtk_scp *scp) 665 { 666 int ret; 667 668 ret = of_reserved_mem_device_init(scp->dev); 669 670 /* reserved memory is optional. */ 671 if (ret == -ENODEV) { 672 dev_info(scp->dev, "skipping reserved memory initialization."); 673 return 0; 674 } 675 676 if (ret) { 677 dev_err(scp->dev, "failed to assign memory-region: %d\n", ret); 678 return -ENOMEM; 679 } 680 681 /* Reserved SCP code size */ 682 scp->dram_size = MAX_CODE_SIZE; 683 scp->cpu_addr = dma_alloc_coherent(scp->dev, scp->dram_size, 684 &scp->dma_addr, GFP_KERNEL); 685 if (!scp->cpu_addr) 686 return -ENOMEM; 687 688 return 0; 689 } 690 691 static void scp_unmap_memory_region(struct mtk_scp *scp) 692 { 693 if (scp->dram_size == 0) 694 return; 695 696 dma_free_coherent(scp->dev, scp->dram_size, scp->cpu_addr, 697 scp->dma_addr); 698 of_reserved_mem_device_release(scp->dev); 699 } 700 701 static int scp_register_ipi(struct platform_device *pdev, u32 id, 702 ipi_handler_t handler, void *priv) 703 { 704 struct mtk_scp *scp = platform_get_drvdata(pdev); 705 706 return scp_ipi_register(scp, id, handler, priv); 707 } 708 709 static void scp_unregister_ipi(struct platform_device *pdev, u32 id) 710 { 711 struct mtk_scp *scp = platform_get_drvdata(pdev); 712 713 scp_ipi_unregister(scp, id); 714 } 715 716 static int scp_send_ipi(struct platform_device *pdev, u32 id, void *buf, 717 unsigned int len, unsigned int wait) 718 { 719 struct mtk_scp *scp = platform_get_drvdata(pdev); 720 721 return scp_ipi_send(scp, id, buf, len, wait); 722 } 723 724 static struct mtk_rpmsg_info mtk_scp_rpmsg_info = { 725 .send_ipi = scp_send_ipi, 726 .register_ipi = scp_register_ipi, 727 .unregister_ipi = scp_unregister_ipi, 728 .ns_ipi_id = SCP_IPI_NS_SERVICE, 729 }; 730 731 static void scp_add_rpmsg_subdev(struct mtk_scp *scp) 732 { 733 scp->rpmsg_subdev = 734 mtk_rpmsg_create_rproc_subdev(to_platform_device(scp->dev), 735 &mtk_scp_rpmsg_info); 736 if (scp->rpmsg_subdev) 737 rproc_add_subdev(scp->rproc, scp->rpmsg_subdev); 738 } 739 740 static void scp_remove_rpmsg_subdev(struct mtk_scp *scp) 741 { 742 if (scp->rpmsg_subdev) { 743 rproc_remove_subdev(scp->rproc, scp->rpmsg_subdev); 744 mtk_rpmsg_destroy_rproc_subdev(scp->rpmsg_subdev); 745 scp->rpmsg_subdev = NULL; 746 } 747 } 748 749 static int scp_probe(struct platform_device *pdev) 750 { 751 struct device *dev = &pdev->dev; 752 struct device_node *np = dev->of_node; 753 struct mtk_scp *scp; 754 struct rproc *rproc; 755 struct resource *res; 756 char *fw_name = "scp.img"; 757 int ret, i; 758 759 rproc = rproc_alloc(dev, 760 np->name, 761 &scp_ops, 762 fw_name, 763 sizeof(*scp)); 764 if (!rproc) { 765 dev_err(dev, "unable to allocate remoteproc\n"); 766 return -ENOMEM; 767 } 768 769 scp = (struct mtk_scp *)rproc->priv; 770 scp->rproc = rproc; 771 scp->dev = dev; 772 scp->data = of_device_get_match_data(dev); 773 platform_set_drvdata(pdev, scp); 774 775 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "sram"); 776 scp->sram_base = devm_ioremap_resource(dev, res); 777 if (IS_ERR((__force void *)scp->sram_base)) { 778 dev_err(dev, "Failed to parse and map sram memory\n"); 779 ret = PTR_ERR((__force void *)scp->sram_base); 780 goto free_rproc; 781 } 782 scp->sram_size = resource_size(res); 783 scp->sram_phys = res->start; 784 785 /* l1tcm is an optional memory region */ 786 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "l1tcm"); 787 scp->l1tcm_base = devm_ioremap_resource(dev, res); 788 if (IS_ERR((__force void *)scp->l1tcm_base)) { 789 ret = PTR_ERR((__force void *)scp->l1tcm_base); 790 if (ret != -EINVAL) { 791 dev_err(dev, "Failed to map l1tcm memory\n"); 792 goto free_rproc; 793 } 794 } else { 795 scp->l1tcm_size = resource_size(res); 796 scp->l1tcm_phys = res->start; 797 } 798 799 mutex_init(&scp->send_lock); 800 for (i = 0; i < SCP_IPI_MAX; i++) 801 mutex_init(&scp->ipi_desc[i].lock); 802 803 scp->reg_base = devm_platform_ioremap_resource_byname(pdev, "cfg"); 804 if (IS_ERR((__force void *)scp->reg_base)) { 805 dev_err(dev, "Failed to parse and map cfg memory\n"); 806 ret = PTR_ERR((__force void *)scp->reg_base); 807 goto destroy_mutex; 808 } 809 810 ret = scp_map_memory_region(scp); 811 if (ret) 812 goto destroy_mutex; 813 814 ret = scp->data->scp_clk_get(scp); 815 if (ret) 816 goto release_dev_mem; 817 818 /* register SCP initialization IPI */ 819 ret = scp_ipi_register(scp, SCP_IPI_INIT, scp_init_ipi_handler, scp); 820 if (ret) { 821 dev_err(dev, "Failed to register IPI_SCP_INIT\n"); 822 goto release_dev_mem; 823 } 824 825 init_waitqueue_head(&scp->run.wq); 826 init_waitqueue_head(&scp->ack_wq); 827 828 scp_add_rpmsg_subdev(scp); 829 830 ret = devm_request_threaded_irq(dev, platform_get_irq(pdev, 0), NULL, 831 scp_irq_handler, IRQF_ONESHOT, 832 pdev->name, scp); 833 834 if (ret) { 835 dev_err(dev, "failed to request irq\n"); 836 goto remove_subdev; 837 } 838 839 ret = rproc_add(rproc); 840 if (ret) 841 goto remove_subdev; 842 843 return 0; 844 845 remove_subdev: 846 scp_remove_rpmsg_subdev(scp); 847 scp_ipi_unregister(scp, SCP_IPI_INIT); 848 release_dev_mem: 849 scp_unmap_memory_region(scp); 850 destroy_mutex: 851 for (i = 0; i < SCP_IPI_MAX; i++) 852 mutex_destroy(&scp->ipi_desc[i].lock); 853 mutex_destroy(&scp->send_lock); 854 free_rproc: 855 rproc_free(rproc); 856 857 return ret; 858 } 859 860 static int scp_remove(struct platform_device *pdev) 861 { 862 struct mtk_scp *scp = platform_get_drvdata(pdev); 863 int i; 864 865 rproc_del(scp->rproc); 866 scp_remove_rpmsg_subdev(scp); 867 scp_ipi_unregister(scp, SCP_IPI_INIT); 868 scp_unmap_memory_region(scp); 869 for (i = 0; i < SCP_IPI_MAX; i++) 870 mutex_destroy(&scp->ipi_desc[i].lock); 871 mutex_destroy(&scp->send_lock); 872 rproc_free(scp->rproc); 873 874 return 0; 875 } 876 877 static const struct mtk_scp_of_data mt8183_of_data = { 878 .scp_clk_get = mt8183_scp_clk_get, 879 .scp_before_load = mt8183_scp_before_load, 880 .scp_irq_handler = mt8183_scp_irq_handler, 881 .scp_reset_assert = mt8183_scp_reset_assert, 882 .scp_reset_deassert = mt8183_scp_reset_deassert, 883 .scp_stop = mt8183_scp_stop, 884 .scp_da_to_va = mt8183_scp_da_to_va, 885 .host_to_scp_reg = MT8183_HOST_TO_SCP, 886 .host_to_scp_int_bit = MT8183_HOST_IPC_INT_BIT, 887 .ipi_buf_offset = 0x7bdb0, 888 }; 889 890 static const struct mtk_scp_of_data mt8192_of_data = { 891 .scp_clk_get = mt8192_scp_clk_get, 892 .scp_before_load = mt8192_scp_before_load, 893 .scp_irq_handler = mt8192_scp_irq_handler, 894 .scp_reset_assert = mt8192_scp_reset_assert, 895 .scp_reset_deassert = mt8192_scp_reset_deassert, 896 .scp_stop = mt8192_scp_stop, 897 .scp_da_to_va = mt8192_scp_da_to_va, 898 .host_to_scp_reg = MT8192_GIPC_IN_SET, 899 .host_to_scp_int_bit = MT8192_HOST_IPC_INT_BIT, 900 }; 901 902 static const struct mtk_scp_of_data mt8195_of_data = { 903 .scp_clk_get = mt8195_scp_clk_get, 904 .scp_before_load = mt8192_scp_before_load, 905 .scp_irq_handler = mt8192_scp_irq_handler, 906 .scp_reset_assert = mt8192_scp_reset_assert, 907 .scp_reset_deassert = mt8192_scp_reset_deassert, 908 .scp_stop = mt8192_scp_stop, 909 .scp_da_to_va = mt8192_scp_da_to_va, 910 .host_to_scp_reg = MT8192_GIPC_IN_SET, 911 .host_to_scp_int_bit = MT8192_HOST_IPC_INT_BIT, 912 }; 913 914 static const struct of_device_id mtk_scp_of_match[] = { 915 { .compatible = "mediatek,mt8183-scp", .data = &mt8183_of_data }, 916 { .compatible = "mediatek,mt8192-scp", .data = &mt8192_of_data }, 917 { .compatible = "mediatek,mt8195-scp", .data = &mt8195_of_data }, 918 {}, 919 }; 920 MODULE_DEVICE_TABLE(of, mtk_scp_of_match); 921 922 static struct platform_driver mtk_scp_driver = { 923 .probe = scp_probe, 924 .remove = scp_remove, 925 .driver = { 926 .name = "mtk-scp", 927 .of_match_table = mtk_scp_of_match, 928 }, 929 }; 930 931 module_platform_driver(mtk_scp_driver); 932 933 MODULE_LICENSE("GPL v2"); 934 MODULE_DESCRIPTION("MediaTek SCP control driver"); 935