1 // SPDX-License-Identifier: GPL-2.0+ 2 /* * CAAM control-plane driver backend 3 * Controller-level driver, kernel property detection, initialization 4 * 5 * Copyright 2008-2012 Freescale Semiconductor, Inc. 6 * Copyright 2018-2019, 2023 NXP 7 */ 8 9 #include <linux/device.h> 10 #include <linux/of_address.h> 11 #include <linux/of_irq.h> 12 #include <linux/platform_device.h> 13 #include <linux/sys_soc.h> 14 #include <linux/fsl/mc.h> 15 16 #include "compat.h" 17 #include "debugfs.h" 18 #include "regs.h" 19 #include "intern.h" 20 #include "jr.h" 21 #include "desc_constr.h" 22 #include "ctrl.h" 23 24 bool caam_dpaa2; 25 EXPORT_SYMBOL(caam_dpaa2); 26 27 #ifdef CONFIG_CAAM_QI 28 #include "qi.h" 29 #endif 30 31 /* 32 * Descriptor to instantiate RNG State Handle 0 in normal mode and 33 * load the JDKEK, TDKEK and TDSK registers 34 */ 35 static void build_instantiation_desc(u32 *desc, int handle, int do_sk) 36 { 37 u32 *jump_cmd, op_flags; 38 39 init_job_desc(desc, 0); 40 41 op_flags = OP_TYPE_CLASS1_ALG | OP_ALG_ALGSEL_RNG | 42 (handle << OP_ALG_AAI_SHIFT) | OP_ALG_AS_INIT | 43 OP_ALG_PR_ON; 44 45 /* INIT RNG in non-test mode */ 46 append_operation(desc, op_flags); 47 48 if (!handle && do_sk) { 49 /* 50 * For SH0, Secure Keys must be generated as well 51 */ 52 53 /* wait for done */ 54 jump_cmd = append_jump(desc, JUMP_CLASS_CLASS1); 55 set_jump_tgt_here(desc, jump_cmd); 56 57 /* 58 * load 1 to clear written reg: 59 * resets the done interrupt and returns the RNG to idle. 60 */ 61 append_load_imm_u32(desc, 1, LDST_SRCDST_WORD_CLRW); 62 63 /* Initialize State Handle */ 64 append_operation(desc, OP_TYPE_CLASS1_ALG | OP_ALG_ALGSEL_RNG | 65 OP_ALG_AAI_RNG4_SK); 66 } 67 68 append_jump(desc, JUMP_CLASS_CLASS1 | JUMP_TYPE_HALT); 69 } 70 71 /* Descriptor for deinstantiation of State Handle 0 of the RNG block. */ 72 static void build_deinstantiation_desc(u32 *desc, int handle) 73 { 74 init_job_desc(desc, 0); 75 76 /* Uninstantiate State Handle 0 */ 77 append_operation(desc, OP_TYPE_CLASS1_ALG | OP_ALG_ALGSEL_RNG | 78 (handle << OP_ALG_AAI_SHIFT) | OP_ALG_AS_INITFINAL); 79 80 append_jump(desc, JUMP_CLASS_CLASS1 | JUMP_TYPE_HALT); 81 } 82 83 #ifdef CONFIG_OF 84 static const struct of_device_id imx8m_machine_match[] = { 85 { .compatible = "fsl,imx8mm", }, 86 { .compatible = "fsl,imx8mn", }, 87 { .compatible = "fsl,imx8mp", }, 88 { .compatible = "fsl,imx8mq", }, 89 { .compatible = "fsl,imx8ulp", }, 90 { } 91 }; 92 #endif 93 94 /* 95 * run_descriptor_deco0 - runs a descriptor on DECO0, under direct control of 96 * the software (no JR/QI used). 97 * @ctrldev - pointer to device 98 * @status - descriptor status, after being run 99 * 100 * Return: - 0 if no error occurred 101 * - -ENODEV if the DECO couldn't be acquired 102 * - -EAGAIN if an error occurred while executing the descriptor 103 */ 104 static inline int run_descriptor_deco0(struct device *ctrldev, u32 *desc, 105 u32 *status) 106 { 107 struct caam_drv_private *ctrlpriv = dev_get_drvdata(ctrldev); 108 struct caam_ctrl __iomem *ctrl = ctrlpriv->ctrl; 109 struct caam_deco __iomem *deco = ctrlpriv->deco; 110 unsigned int timeout = 100000; 111 u32 deco_dbg_reg, deco_state, flags; 112 int i; 113 114 115 if (ctrlpriv->virt_en == 1 || 116 /* 117 * Apparently on i.MX8M{Q,M,N,P} it doesn't matter if virt_en == 1 118 * and the following steps should be performed regardless 119 */ 120 of_match_node(imx8m_machine_match, of_root)) { 121 clrsetbits_32(&ctrl->deco_rsr, 0, DECORSR_JR0); 122 123 while (!(rd_reg32(&ctrl->deco_rsr) & DECORSR_VALID) && 124 --timeout) 125 cpu_relax(); 126 127 timeout = 100000; 128 } 129 130 clrsetbits_32(&ctrl->deco_rq, 0, DECORR_RQD0ENABLE); 131 132 while (!(rd_reg32(&ctrl->deco_rq) & DECORR_DEN0) && 133 --timeout) 134 cpu_relax(); 135 136 if (!timeout) { 137 dev_err(ctrldev, "failed to acquire DECO 0\n"); 138 clrsetbits_32(&ctrl->deco_rq, DECORR_RQD0ENABLE, 0); 139 return -ENODEV; 140 } 141 142 for (i = 0; i < desc_len(desc); i++) 143 wr_reg32(&deco->descbuf[i], caam32_to_cpu(*(desc + i))); 144 145 flags = DECO_JQCR_WHL; 146 /* 147 * If the descriptor length is longer than 4 words, then the 148 * FOUR bit in JRCTRL register must be set. 149 */ 150 if (desc_len(desc) >= 4) 151 flags |= DECO_JQCR_FOUR; 152 153 /* Instruct the DECO to execute it */ 154 clrsetbits_32(&deco->jr_ctl_hi, 0, flags); 155 156 timeout = 10000000; 157 do { 158 deco_dbg_reg = rd_reg32(&deco->desc_dbg); 159 160 if (ctrlpriv->era < 10) 161 deco_state = (deco_dbg_reg & DESC_DBG_DECO_STAT_MASK) >> 162 DESC_DBG_DECO_STAT_SHIFT; 163 else 164 deco_state = (rd_reg32(&deco->dbg_exec) & 165 DESC_DER_DECO_STAT_MASK) >> 166 DESC_DER_DECO_STAT_SHIFT; 167 168 /* 169 * If an error occurred in the descriptor, then 170 * the DECO status field will be set to 0x0D 171 */ 172 if (deco_state == DECO_STAT_HOST_ERR) 173 break; 174 175 cpu_relax(); 176 } while ((deco_dbg_reg & DESC_DBG_DECO_STAT_VALID) && --timeout); 177 178 *status = rd_reg32(&deco->op_status_hi) & 179 DECO_OP_STATUS_HI_ERR_MASK; 180 181 if (ctrlpriv->virt_en == 1) 182 clrsetbits_32(&ctrl->deco_rsr, DECORSR_JR0, 0); 183 184 /* Mark the DECO as free */ 185 clrsetbits_32(&ctrl->deco_rq, DECORR_RQD0ENABLE, 0); 186 187 if (!timeout) 188 return -EAGAIN; 189 190 return 0; 191 } 192 193 /* 194 * deinstantiate_rng - builds and executes a descriptor on DECO0, 195 * which deinitializes the RNG block. 196 * @ctrldev - pointer to device 197 * @state_handle_mask - bitmask containing the instantiation status 198 * for the RNG4 state handles which exist in 199 * the RNG4 block: 1 if it's been instantiated 200 * 201 * Return: - 0 if no error occurred 202 * - -ENOMEM if there isn't enough memory to allocate the descriptor 203 * - -ENODEV if DECO0 couldn't be acquired 204 * - -EAGAIN if an error occurred when executing the descriptor 205 */ 206 static int deinstantiate_rng(struct device *ctrldev, int state_handle_mask) 207 { 208 u32 *desc, status; 209 int sh_idx, ret = 0; 210 211 desc = kmalloc(CAAM_CMD_SZ * 3, GFP_KERNEL); 212 if (!desc) 213 return -ENOMEM; 214 215 for (sh_idx = 0; sh_idx < RNG4_MAX_HANDLES; sh_idx++) { 216 /* 217 * If the corresponding bit is set, then it means the state 218 * handle was initialized by us, and thus it needs to be 219 * deinitialized as well 220 */ 221 if ((1 << sh_idx) & state_handle_mask) { 222 /* 223 * Create the descriptor for deinstantating this state 224 * handle 225 */ 226 build_deinstantiation_desc(desc, sh_idx); 227 228 /* Try to run it through DECO0 */ 229 ret = run_descriptor_deco0(ctrldev, desc, &status); 230 231 if (ret || 232 (status && status != JRSTA_SSRC_JUMP_HALT_CC)) { 233 dev_err(ctrldev, 234 "Failed to deinstantiate RNG4 SH%d\n", 235 sh_idx); 236 break; 237 } 238 dev_info(ctrldev, "Deinstantiated RNG4 SH%d\n", sh_idx); 239 } 240 } 241 242 kfree(desc); 243 244 return ret; 245 } 246 247 static void devm_deinstantiate_rng(void *data) 248 { 249 struct device *ctrldev = data; 250 struct caam_drv_private *ctrlpriv = dev_get_drvdata(ctrldev); 251 252 /* 253 * De-initialize RNG state handles initialized by this driver. 254 * In case of SoCs with Management Complex, RNG is managed by MC f/w. 255 */ 256 if (ctrlpriv->rng4_sh_init) 257 deinstantiate_rng(ctrldev, ctrlpriv->rng4_sh_init); 258 } 259 260 /* 261 * instantiate_rng - builds and executes a descriptor on DECO0, 262 * which initializes the RNG block. 263 * @ctrldev - pointer to device 264 * @state_handle_mask - bitmask containing the instantiation status 265 * for the RNG4 state handles which exist in 266 * the RNG4 block: 1 if it's been instantiated 267 * by an external entry, 0 otherwise. 268 * @gen_sk - generate data to be loaded into the JDKEK, TDKEK and TDSK; 269 * Caution: this can be done only once; if the keys need to be 270 * regenerated, a POR is required 271 * 272 * Return: - 0 if no error occurred 273 * - -ENOMEM if there isn't enough memory to allocate the descriptor 274 * - -ENODEV if DECO0 couldn't be acquired 275 * - -EAGAIN if an error occurred when executing the descriptor 276 * f.i. there was a RNG hardware error due to not "good enough" 277 * entropy being acquired. 278 */ 279 static int instantiate_rng(struct device *ctrldev, int state_handle_mask, 280 int gen_sk) 281 { 282 struct caam_drv_private *ctrlpriv = dev_get_drvdata(ctrldev); 283 struct caam_ctrl __iomem *ctrl; 284 u32 *desc, status = 0, rdsta_val; 285 int ret = 0, sh_idx; 286 287 ctrl = (struct caam_ctrl __iomem *)ctrlpriv->ctrl; 288 desc = kmalloc(CAAM_CMD_SZ * 7, GFP_KERNEL); 289 if (!desc) 290 return -ENOMEM; 291 292 for (sh_idx = 0; sh_idx < RNG4_MAX_HANDLES; sh_idx++) { 293 const u32 rdsta_if = RDSTA_IF0 << sh_idx; 294 const u32 rdsta_pr = RDSTA_PR0 << sh_idx; 295 const u32 rdsta_mask = rdsta_if | rdsta_pr; 296 297 /* Clear the contents before using the descriptor */ 298 memset(desc, 0x00, CAAM_CMD_SZ * 7); 299 300 /* 301 * If the corresponding bit is set, this state handle 302 * was initialized by somebody else, so it's left alone. 303 */ 304 if (rdsta_if & state_handle_mask) { 305 if (rdsta_pr & state_handle_mask) 306 continue; 307 308 dev_info(ctrldev, 309 "RNG4 SH%d was previously instantiated without prediction resistance. Tearing it down\n", 310 sh_idx); 311 312 ret = deinstantiate_rng(ctrldev, rdsta_if); 313 if (ret) 314 break; 315 } 316 317 /* Create the descriptor for instantiating RNG State Handle */ 318 build_instantiation_desc(desc, sh_idx, gen_sk); 319 320 /* Try to run it through DECO0 */ 321 ret = run_descriptor_deco0(ctrldev, desc, &status); 322 323 /* 324 * If ret is not 0, or descriptor status is not 0, then 325 * something went wrong. No need to try the next state 326 * handle (if available), bail out here. 327 * Also, if for some reason, the State Handle didn't get 328 * instantiated although the descriptor has finished 329 * without any error (HW optimizations for later 330 * CAAM eras), then try again. 331 */ 332 if (ret) 333 break; 334 335 rdsta_val = rd_reg32(&ctrl->r4tst[0].rdsta) & RDSTA_MASK; 336 if ((status && status != JRSTA_SSRC_JUMP_HALT_CC) || 337 (rdsta_val & rdsta_mask) != rdsta_mask) { 338 ret = -EAGAIN; 339 break; 340 } 341 342 dev_info(ctrldev, "Instantiated RNG4 SH%d\n", sh_idx); 343 } 344 345 kfree(desc); 346 347 if (ret) 348 return ret; 349 350 return devm_add_action_or_reset(ctrldev, devm_deinstantiate_rng, ctrldev); 351 } 352 353 /* 354 * kick_trng - sets the various parameters for enabling the initialization 355 * of the RNG4 block in CAAM 356 * @dev - pointer to the controller device 357 * @ent_delay - Defines the length (in system clocks) of each entropy sample. 358 */ 359 static void kick_trng(struct device *dev, int ent_delay) 360 { 361 struct caam_drv_private *ctrlpriv = dev_get_drvdata(dev); 362 struct caam_ctrl __iomem *ctrl; 363 struct rng4tst __iomem *r4tst; 364 u32 val, rtsdctl; 365 366 ctrl = (struct caam_ctrl __iomem *)ctrlpriv->ctrl; 367 r4tst = &ctrl->r4tst[0]; 368 369 /* 370 * Setting both RTMCTL:PRGM and RTMCTL:TRNG_ACC causes TRNG to 371 * properly invalidate the entropy in the entropy register and 372 * force re-generation. 373 */ 374 clrsetbits_32(&r4tst->rtmctl, 0, RTMCTL_PRGM | RTMCTL_ACC); 375 376 /* 377 * Performance-wise, it does not make sense to 378 * set the delay to a value that is lower 379 * than the last one that worked (i.e. the state handles 380 * were instantiated properly). 381 */ 382 rtsdctl = rd_reg32(&r4tst->rtsdctl); 383 val = (rtsdctl & RTSDCTL_ENT_DLY_MASK) >> RTSDCTL_ENT_DLY_SHIFT; 384 if (ent_delay > val) { 385 val = ent_delay; 386 /* min. freq. count, equal to 1/4 of the entropy sample length */ 387 wr_reg32(&r4tst->rtfrqmin, val >> 2); 388 /* disable maximum frequency count */ 389 wr_reg32(&r4tst->rtfrqmax, RTFRQMAX_DISABLE); 390 } 391 392 wr_reg32(&r4tst->rtsdctl, (val << RTSDCTL_ENT_DLY_SHIFT) | 393 RTSDCTL_SAMP_SIZE_VAL); 394 395 /* 396 * To avoid reprogramming the self-test parameters over and over again, 397 * use RTSDCTL[SAMP_SIZE] as an indicator. 398 */ 399 if ((rtsdctl & RTSDCTL_SAMP_SIZE_MASK) != RTSDCTL_SAMP_SIZE_VAL) { 400 wr_reg32(&r4tst->rtscmisc, (2 << 16) | 32); 401 wr_reg32(&r4tst->rtpkrrng, 570); 402 wr_reg32(&r4tst->rtpkrmax, 1600); 403 wr_reg32(&r4tst->rtscml, (122 << 16) | 317); 404 wr_reg32(&r4tst->rtscrl[0], (80 << 16) | 107); 405 wr_reg32(&r4tst->rtscrl[1], (57 << 16) | 62); 406 wr_reg32(&r4tst->rtscrl[2], (39 << 16) | 39); 407 wr_reg32(&r4tst->rtscrl[3], (27 << 16) | 26); 408 wr_reg32(&r4tst->rtscrl[4], (19 << 16) | 18); 409 wr_reg32(&r4tst->rtscrl[5], (18 << 16) | 17); 410 } 411 412 /* 413 * select raw sampling in both entropy shifter 414 * and statistical checker; ; put RNG4 into run mode 415 */ 416 clrsetbits_32(&r4tst->rtmctl, RTMCTL_PRGM | RTMCTL_ACC, 417 RTMCTL_SAMP_MODE_RAW_ES_SC); 418 } 419 420 static int caam_get_era_from_hw(struct caam_perfmon __iomem *perfmon) 421 { 422 static const struct { 423 u16 ip_id; 424 u8 maj_rev; 425 u8 era; 426 } id[] = { 427 {0x0A10, 1, 1}, 428 {0x0A10, 2, 2}, 429 {0x0A12, 1, 3}, 430 {0x0A14, 1, 3}, 431 {0x0A14, 2, 4}, 432 {0x0A16, 1, 4}, 433 {0x0A10, 3, 4}, 434 {0x0A11, 1, 4}, 435 {0x0A18, 1, 4}, 436 {0x0A11, 2, 5}, 437 {0x0A12, 2, 5}, 438 {0x0A13, 1, 5}, 439 {0x0A1C, 1, 5} 440 }; 441 u32 ccbvid, id_ms; 442 u8 maj_rev, era; 443 u16 ip_id; 444 int i; 445 446 ccbvid = rd_reg32(&perfmon->ccb_id); 447 era = (ccbvid & CCBVID_ERA_MASK) >> CCBVID_ERA_SHIFT; 448 if (era) /* This is '0' prior to CAAM ERA-6 */ 449 return era; 450 451 id_ms = rd_reg32(&perfmon->caam_id_ms); 452 ip_id = (id_ms & SECVID_MS_IPID_MASK) >> SECVID_MS_IPID_SHIFT; 453 maj_rev = (id_ms & SECVID_MS_MAJ_REV_MASK) >> SECVID_MS_MAJ_REV_SHIFT; 454 455 for (i = 0; i < ARRAY_SIZE(id); i++) 456 if (id[i].ip_id == ip_id && id[i].maj_rev == maj_rev) 457 return id[i].era; 458 459 return -ENOTSUPP; 460 } 461 462 /** 463 * caam_get_era() - Return the ERA of the SEC on SoC, based 464 * on "sec-era" optional property in the DTS. This property is updated 465 * by u-boot. 466 * In case this property is not passed an attempt to retrieve the CAAM 467 * era via register reads will be made. 468 * 469 * @perfmon: Performance Monitor Registers 470 */ 471 static int caam_get_era(struct caam_perfmon __iomem *perfmon) 472 { 473 struct device_node *caam_node; 474 int ret; 475 u32 prop; 476 477 caam_node = of_find_compatible_node(NULL, NULL, "fsl,sec-v4.0"); 478 ret = of_property_read_u32(caam_node, "fsl,sec-era", &prop); 479 of_node_put(caam_node); 480 481 if (!ret) 482 return prop; 483 else 484 return caam_get_era_from_hw(perfmon); 485 } 486 487 /* 488 * ERRATA: imx6 devices (imx6D, imx6Q, imx6DL, imx6S, imx6DP and imx6QP) 489 * have an issue wherein AXI bus transactions may not occur in the correct 490 * order. This isn't a problem running single descriptors, but can be if 491 * running multiple concurrent descriptors. Reworking the driver to throttle 492 * to single requests is impractical, thus the workaround is to limit the AXI 493 * pipeline to a depth of 1 (from it's default of 4) to preclude this situation 494 * from occurring. 495 */ 496 static void handle_imx6_err005766(u32 __iomem *mcr) 497 { 498 if (of_machine_is_compatible("fsl,imx6q") || 499 of_machine_is_compatible("fsl,imx6dl") || 500 of_machine_is_compatible("fsl,imx6qp")) 501 clrsetbits_32(mcr, MCFGR_AXIPIPE_MASK, 502 1 << MCFGR_AXIPIPE_SHIFT); 503 } 504 505 static const struct of_device_id caam_match[] = { 506 { 507 .compatible = "fsl,sec-v4.0", 508 }, 509 { 510 .compatible = "fsl,sec4.0", 511 }, 512 {}, 513 }; 514 MODULE_DEVICE_TABLE(of, caam_match); 515 516 struct caam_imx_data { 517 bool page0_access; 518 const struct clk_bulk_data *clks; 519 int num_clks; 520 }; 521 522 static const struct clk_bulk_data caam_imx6_clks[] = { 523 { .id = "ipg" }, 524 { .id = "mem" }, 525 { .id = "aclk" }, 526 { .id = "emi_slow" }, 527 }; 528 529 static const struct caam_imx_data caam_imx6_data = { 530 .page0_access = true, 531 .clks = caam_imx6_clks, 532 .num_clks = ARRAY_SIZE(caam_imx6_clks), 533 }; 534 535 static const struct clk_bulk_data caam_imx7_clks[] = { 536 { .id = "ipg" }, 537 { .id = "aclk" }, 538 }; 539 540 static const struct caam_imx_data caam_imx7_data = { 541 .page0_access = true, 542 .clks = caam_imx7_clks, 543 .num_clks = ARRAY_SIZE(caam_imx7_clks), 544 }; 545 546 static const struct clk_bulk_data caam_imx6ul_clks[] = { 547 { .id = "ipg" }, 548 { .id = "mem" }, 549 { .id = "aclk" }, 550 }; 551 552 static const struct caam_imx_data caam_imx6ul_data = { 553 .page0_access = true, 554 .clks = caam_imx6ul_clks, 555 .num_clks = ARRAY_SIZE(caam_imx6ul_clks), 556 }; 557 558 static const struct clk_bulk_data caam_vf610_clks[] = { 559 { .id = "ipg" }, 560 }; 561 562 static const struct caam_imx_data caam_vf610_data = { 563 .page0_access = true, 564 .clks = caam_vf610_clks, 565 .num_clks = ARRAY_SIZE(caam_vf610_clks), 566 }; 567 568 static const struct caam_imx_data caam_imx8ulp_data; 569 570 static const struct soc_device_attribute caam_imx_soc_table[] = { 571 { .soc_id = "i.MX6UL", .data = &caam_imx6ul_data }, 572 { .soc_id = "i.MX6*", .data = &caam_imx6_data }, 573 { .soc_id = "i.MX7*", .data = &caam_imx7_data }, 574 { .soc_id = "i.MX8M*", .data = &caam_imx7_data }, 575 { .soc_id = "i.MX8ULP", .data = &caam_imx8ulp_data }, 576 { .soc_id = "i.MX8QM", .data = &caam_imx8ulp_data }, 577 { .soc_id = "VF*", .data = &caam_vf610_data }, 578 { .family = "Freescale i.MX" }, 579 { /* sentinel */ } 580 }; 581 582 static void disable_clocks(void *data) 583 { 584 struct caam_drv_private *ctrlpriv = data; 585 586 clk_bulk_disable_unprepare(ctrlpriv->num_clks, ctrlpriv->clks); 587 } 588 589 static int init_clocks(struct device *dev, const struct caam_imx_data *data) 590 { 591 struct caam_drv_private *ctrlpriv = dev_get_drvdata(dev); 592 int ret; 593 594 ctrlpriv->num_clks = data->num_clks; 595 ctrlpriv->clks = devm_kmemdup(dev, data->clks, 596 data->num_clks * sizeof(data->clks[0]), 597 GFP_KERNEL); 598 if (!ctrlpriv->clks) 599 return -ENOMEM; 600 601 ret = devm_clk_bulk_get(dev, ctrlpriv->num_clks, ctrlpriv->clks); 602 if (ret) { 603 dev_err(dev, 604 "Failed to request all necessary clocks\n"); 605 return ret; 606 } 607 608 ret = clk_bulk_prepare_enable(ctrlpriv->num_clks, ctrlpriv->clks); 609 if (ret) { 610 dev_err(dev, 611 "Failed to prepare/enable all necessary clocks\n"); 612 return ret; 613 } 614 615 return devm_add_action_or_reset(dev, disable_clocks, ctrlpriv); 616 } 617 618 static void caam_remove_debugfs(void *root) 619 { 620 debugfs_remove_recursive(root); 621 } 622 623 #ifdef CONFIG_FSL_MC_BUS 624 static bool check_version(struct fsl_mc_version *mc_version, u32 major, 625 u32 minor, u32 revision) 626 { 627 if (mc_version->major > major) 628 return true; 629 630 if (mc_version->major == major) { 631 if (mc_version->minor > minor) 632 return true; 633 634 if (mc_version->minor == minor && 635 mc_version->revision > revision) 636 return true; 637 } 638 639 return false; 640 } 641 #endif 642 643 static bool needs_entropy_delay_adjustment(void) 644 { 645 if (of_machine_is_compatible("fsl,imx6sx")) 646 return true; 647 return false; 648 } 649 650 static int caam_ctrl_rng_init(struct device *dev) 651 { 652 struct caam_drv_private *ctrlpriv = dev_get_drvdata(dev); 653 struct caam_ctrl __iomem *ctrl = ctrlpriv->ctrl; 654 int ret, gen_sk, ent_delay = RTSDCTL_ENT_DLY_MIN; 655 u8 rng_vid; 656 657 if (ctrlpriv->era < 10) { 658 struct caam_perfmon __iomem *perfmon; 659 660 perfmon = ctrlpriv->total_jobrs ? 661 (struct caam_perfmon __iomem *)&ctrlpriv->jr[0]->perfmon : 662 (struct caam_perfmon __iomem *)&ctrl->perfmon; 663 664 rng_vid = (rd_reg32(&perfmon->cha_id_ls) & 665 CHA_ID_LS_RNG_MASK) >> CHA_ID_LS_RNG_SHIFT; 666 } else { 667 struct version_regs __iomem *vreg; 668 669 vreg = ctrlpriv->total_jobrs ? 670 (struct version_regs __iomem *)&ctrlpriv->jr[0]->vreg : 671 (struct version_regs __iomem *)&ctrl->vreg; 672 673 rng_vid = (rd_reg32(&vreg->rng) & CHA_VER_VID_MASK) >> 674 CHA_VER_VID_SHIFT; 675 } 676 677 /* 678 * If SEC has RNG version >= 4 and RNG state handle has not been 679 * already instantiated, do RNG instantiation 680 * In case of SoCs with Management Complex, RNG is managed by MC f/w. 681 */ 682 if (!(ctrlpriv->mc_en && ctrlpriv->pr_support) && rng_vid >= 4) { 683 ctrlpriv->rng4_sh_init = 684 rd_reg32(&ctrl->r4tst[0].rdsta); 685 /* 686 * If the secure keys (TDKEK, JDKEK, TDSK), were already 687 * generated, signal this to the function that is instantiating 688 * the state handles. An error would occur if RNG4 attempts 689 * to regenerate these keys before the next POR. 690 */ 691 gen_sk = ctrlpriv->rng4_sh_init & RDSTA_SKVN ? 0 : 1; 692 ctrlpriv->rng4_sh_init &= RDSTA_MASK; 693 do { 694 int inst_handles = 695 rd_reg32(&ctrl->r4tst[0].rdsta) & RDSTA_MASK; 696 /* 697 * If either SH were instantiated by somebody else 698 * (e.g. u-boot) then it is assumed that the entropy 699 * parameters are properly set and thus the function 700 * setting these (kick_trng(...)) is skipped. 701 * Also, if a handle was instantiated, do not change 702 * the TRNG parameters. 703 */ 704 if (needs_entropy_delay_adjustment()) 705 ent_delay = 12000; 706 if (!(ctrlpriv->rng4_sh_init || inst_handles)) { 707 dev_info(dev, 708 "Entropy delay = %u\n", 709 ent_delay); 710 kick_trng(dev, ent_delay); 711 ent_delay += 400; 712 } 713 /* 714 * if instantiate_rng(...) fails, the loop will rerun 715 * and the kick_trng(...) function will modify the 716 * upper and lower limits of the entropy sampling 717 * interval, leading to a successful initialization of 718 * the RNG. 719 */ 720 ret = instantiate_rng(dev, inst_handles, 721 gen_sk); 722 /* 723 * Entropy delay is determined via TRNG characterization. 724 * TRNG characterization is run across different voltages 725 * and temperatures. 726 * If worst case value for ent_dly is identified, 727 * the loop can be skipped for that platform. 728 */ 729 if (needs_entropy_delay_adjustment()) 730 break; 731 if (ret == -EAGAIN) 732 /* 733 * if here, the loop will rerun, 734 * so don't hog the CPU 735 */ 736 cpu_relax(); 737 } while ((ret == -EAGAIN) && (ent_delay < RTSDCTL_ENT_DLY_MAX)); 738 if (ret) { 739 dev_err(dev, "failed to instantiate RNG"); 740 return ret; 741 } 742 /* 743 * Set handles initialized by this module as the complement of 744 * the already initialized ones 745 */ 746 ctrlpriv->rng4_sh_init = ~ctrlpriv->rng4_sh_init & RDSTA_MASK; 747 748 /* Enable RDB bit so that RNG works faster */ 749 clrsetbits_32(&ctrl->scfgr, 0, SCFGR_RDBENABLE); 750 } 751 752 return 0; 753 } 754 755 /* Indicate if the internal state of the CAAM is lost during PM */ 756 static int caam_off_during_pm(void) 757 { 758 bool not_off_during_pm = of_machine_is_compatible("fsl,imx6q") || 759 of_machine_is_compatible("fsl,imx6qp") || 760 of_machine_is_compatible("fsl,imx6dl"); 761 762 return not_off_during_pm ? 0 : 1; 763 } 764 765 static void caam_state_save(struct device *dev) 766 { 767 struct caam_drv_private *ctrlpriv = dev_get_drvdata(dev); 768 struct caam_ctl_state *state = &ctrlpriv->state; 769 struct caam_ctrl __iomem *ctrl = ctrlpriv->ctrl; 770 u32 deco_inst, jr_inst; 771 int i; 772 773 state->mcr = rd_reg32(&ctrl->mcr); 774 state->scfgr = rd_reg32(&ctrl->scfgr); 775 776 deco_inst = (rd_reg32(&ctrl->perfmon.cha_num_ms) & 777 CHA_ID_MS_DECO_MASK) >> CHA_ID_MS_DECO_SHIFT; 778 for (i = 0; i < deco_inst; i++) { 779 state->deco_mid[i].liodn_ms = 780 rd_reg32(&ctrl->deco_mid[i].liodn_ms); 781 state->deco_mid[i].liodn_ls = 782 rd_reg32(&ctrl->deco_mid[i].liodn_ls); 783 } 784 785 jr_inst = (rd_reg32(&ctrl->perfmon.cha_num_ms) & 786 CHA_ID_MS_JR_MASK) >> CHA_ID_MS_JR_SHIFT; 787 for (i = 0; i < jr_inst; i++) { 788 state->jr_mid[i].liodn_ms = 789 rd_reg32(&ctrl->jr_mid[i].liodn_ms); 790 state->jr_mid[i].liodn_ls = 791 rd_reg32(&ctrl->jr_mid[i].liodn_ls); 792 } 793 } 794 795 static void caam_state_restore(const struct device *dev) 796 { 797 const struct caam_drv_private *ctrlpriv = dev_get_drvdata(dev); 798 const struct caam_ctl_state *state = &ctrlpriv->state; 799 struct caam_ctrl __iomem *ctrl = ctrlpriv->ctrl; 800 u32 deco_inst, jr_inst; 801 int i; 802 803 wr_reg32(&ctrl->mcr, state->mcr); 804 wr_reg32(&ctrl->scfgr, state->scfgr); 805 806 deco_inst = (rd_reg32(&ctrl->perfmon.cha_num_ms) & 807 CHA_ID_MS_DECO_MASK) >> CHA_ID_MS_DECO_SHIFT; 808 for (i = 0; i < deco_inst; i++) { 809 wr_reg32(&ctrl->deco_mid[i].liodn_ms, 810 state->deco_mid[i].liodn_ms); 811 wr_reg32(&ctrl->deco_mid[i].liodn_ls, 812 state->deco_mid[i].liodn_ls); 813 } 814 815 jr_inst = (rd_reg32(&ctrl->perfmon.cha_num_ms) & 816 CHA_ID_MS_JR_MASK) >> CHA_ID_MS_JR_SHIFT; 817 for (i = 0; i < jr_inst; i++) { 818 wr_reg32(&ctrl->jr_mid[i].liodn_ms, 819 state->jr_mid[i].liodn_ms); 820 wr_reg32(&ctrl->jr_mid[i].liodn_ls, 821 state->jr_mid[i].liodn_ls); 822 } 823 824 if (ctrlpriv->virt_en == 1) 825 clrsetbits_32(&ctrl->jrstart, 0, JRSTART_JR0_START | 826 JRSTART_JR1_START | JRSTART_JR2_START | 827 JRSTART_JR3_START); 828 } 829 830 static int caam_ctrl_suspend(struct device *dev) 831 { 832 const struct caam_drv_private *ctrlpriv = dev_get_drvdata(dev); 833 834 if (ctrlpriv->caam_off_during_pm && !ctrlpriv->optee_en) 835 caam_state_save(dev); 836 837 return 0; 838 } 839 840 static int caam_ctrl_resume(struct device *dev) 841 { 842 struct caam_drv_private *ctrlpriv = dev_get_drvdata(dev); 843 int ret = 0; 844 845 if (ctrlpriv->caam_off_during_pm && !ctrlpriv->optee_en) { 846 caam_state_restore(dev); 847 848 /* HW and rng will be reset so deinstantiation can be removed */ 849 devm_remove_action(dev, devm_deinstantiate_rng, dev); 850 ret = caam_ctrl_rng_init(dev); 851 } 852 853 return ret; 854 } 855 856 static DEFINE_SIMPLE_DEV_PM_OPS(caam_ctrl_pm_ops, caam_ctrl_suspend, caam_ctrl_resume); 857 858 /* Probe routine for CAAM top (controller) level */ 859 static int caam_probe(struct platform_device *pdev) 860 { 861 int ret, ring; 862 u64 caam_id; 863 const struct soc_device_attribute *imx_soc_match; 864 struct device *dev; 865 struct device_node *nprop, *np; 866 struct caam_ctrl __iomem *ctrl; 867 struct caam_drv_private *ctrlpriv; 868 struct caam_perfmon __iomem *perfmon; 869 struct dentry *dfs_root; 870 u32 scfgr, comp_params; 871 int pg_size; 872 int BLOCK_OFFSET = 0; 873 bool reg_access = true; 874 const struct caam_imx_data *imx_soc_data; 875 876 ctrlpriv = devm_kzalloc(&pdev->dev, sizeof(*ctrlpriv), GFP_KERNEL); 877 if (!ctrlpriv) 878 return -ENOMEM; 879 880 dev = &pdev->dev; 881 dev_set_drvdata(dev, ctrlpriv); 882 nprop = pdev->dev.of_node; 883 884 imx_soc_match = soc_device_match(caam_imx_soc_table); 885 if (!imx_soc_match && of_match_node(imx8m_machine_match, of_root)) 886 return -EPROBE_DEFER; 887 888 caam_imx = (bool)imx_soc_match; 889 890 ctrlpriv->caam_off_during_pm = caam_imx && caam_off_during_pm(); 891 892 if (imx_soc_match) { 893 /* 894 * Until Layerscape and i.MX OP-TEE get in sync, 895 * only i.MX OP-TEE use cases disallow access to 896 * caam page 0 (controller) registers. 897 */ 898 np = of_find_compatible_node(NULL, NULL, "linaro,optee-tz"); 899 ctrlpriv->optee_en = !!np; 900 of_node_put(np); 901 902 reg_access = !ctrlpriv->optee_en; 903 904 if (!imx_soc_match->data) { 905 dev_err(dev, "No clock data provided for i.MX SoC"); 906 return -EINVAL; 907 } 908 909 imx_soc_data = imx_soc_match->data; 910 reg_access = reg_access && imx_soc_data->page0_access; 911 /* 912 * CAAM clocks cannot be controlled from kernel. 913 */ 914 if (!imx_soc_data->num_clks) 915 goto iomap_ctrl; 916 917 ret = init_clocks(dev, imx_soc_match->data); 918 if (ret) 919 return ret; 920 } 921 922 iomap_ctrl: 923 /* Get configuration properties from device tree */ 924 /* First, get register page */ 925 ctrl = devm_of_iomap(dev, nprop, 0, NULL); 926 ret = PTR_ERR_OR_ZERO(ctrl); 927 if (ret) { 928 dev_err(dev, "caam: of_iomap() failed\n"); 929 return ret; 930 } 931 932 ring = 0; 933 for_each_available_child_of_node(nprop, np) 934 if (of_device_is_compatible(np, "fsl,sec-v4.0-job-ring") || 935 of_device_is_compatible(np, "fsl,sec4.0-job-ring")) { 936 u32 reg; 937 938 if (of_property_read_u32_index(np, "reg", 0, ®)) { 939 dev_err(dev, "%s read reg property error\n", 940 np->full_name); 941 continue; 942 } 943 944 ctrlpriv->jr[ring] = (struct caam_job_ring __iomem __force *) 945 ((__force uint8_t *)ctrl + reg); 946 947 ctrlpriv->total_jobrs++; 948 ring++; 949 } 950 951 /* 952 * Wherever possible, instead of accessing registers from the global page, 953 * use the alias registers in the first (cf. DT nodes order) 954 * job ring's page. 955 */ 956 perfmon = ring ? (struct caam_perfmon __iomem *)&ctrlpriv->jr[0]->perfmon : 957 (struct caam_perfmon __iomem *)&ctrl->perfmon; 958 959 caam_little_end = !(bool)(rd_reg32(&perfmon->status) & 960 (CSTA_PLEND | CSTA_ALT_PLEND)); 961 comp_params = rd_reg32(&perfmon->comp_parms_ms); 962 if (reg_access && comp_params & CTPR_MS_PS && 963 rd_reg32(&ctrl->mcr) & MCFGR_LONG_PTR) 964 caam_ptr_sz = sizeof(u64); 965 else 966 caam_ptr_sz = sizeof(u32); 967 caam_dpaa2 = !!(comp_params & CTPR_MS_DPAA2); 968 ctrlpriv->qi_present = !!(comp_params & CTPR_MS_QI_MASK); 969 970 #ifdef CONFIG_CAAM_QI 971 /* If (DPAA 1.x) QI present, check whether dependencies are available */ 972 if (ctrlpriv->qi_present && !caam_dpaa2) { 973 ret = qman_is_probed(); 974 if (!ret) { 975 return -EPROBE_DEFER; 976 } else if (ret < 0) { 977 dev_err(dev, "failing probe due to qman probe error\n"); 978 return -ENODEV; 979 } 980 981 ret = qman_portals_probed(); 982 if (!ret) { 983 return -EPROBE_DEFER; 984 } else if (ret < 0) { 985 dev_err(dev, "failing probe due to qman portals probe error\n"); 986 return -ENODEV; 987 } 988 } 989 #endif 990 991 /* Allocating the BLOCK_OFFSET based on the supported page size on 992 * the platform 993 */ 994 pg_size = (comp_params & CTPR_MS_PG_SZ_MASK) >> CTPR_MS_PG_SZ_SHIFT; 995 if (pg_size == 0) 996 BLOCK_OFFSET = PG_SIZE_4K; 997 else 998 BLOCK_OFFSET = PG_SIZE_64K; 999 1000 ctrlpriv->ctrl = (struct caam_ctrl __iomem __force *)ctrl; 1001 ctrlpriv->assure = (struct caam_assurance __iomem __force *) 1002 ((__force uint8_t *)ctrl + 1003 BLOCK_OFFSET * ASSURE_BLOCK_NUMBER 1004 ); 1005 ctrlpriv->deco = (struct caam_deco __iomem __force *) 1006 ((__force uint8_t *)ctrl + 1007 BLOCK_OFFSET * DECO_BLOCK_NUMBER 1008 ); 1009 1010 /* Get the IRQ of the controller (for security violations only) */ 1011 ctrlpriv->secvio_irq = irq_of_parse_and_map(nprop, 0); 1012 np = of_find_compatible_node(NULL, NULL, "fsl,qoriq-mc"); 1013 ctrlpriv->mc_en = !!np; 1014 of_node_put(np); 1015 1016 #ifdef CONFIG_FSL_MC_BUS 1017 if (ctrlpriv->mc_en) { 1018 struct fsl_mc_version *mc_version; 1019 1020 mc_version = fsl_mc_get_version(); 1021 if (mc_version) 1022 ctrlpriv->pr_support = check_version(mc_version, 10, 20, 1023 0); 1024 else 1025 return -EPROBE_DEFER; 1026 } 1027 #endif 1028 1029 if (!reg_access) 1030 goto set_dma_mask; 1031 1032 /* 1033 * Enable DECO watchdogs and, if this is a PHYS_ADDR_T_64BIT kernel, 1034 * long pointers in master configuration register. 1035 * In case of SoCs with Management Complex, MC f/w performs 1036 * the configuration. 1037 */ 1038 if (!ctrlpriv->mc_en) 1039 clrsetbits_32(&ctrl->mcr, MCFGR_AWCACHE_MASK, 1040 MCFGR_AWCACHE_CACH | MCFGR_AWCACHE_BUFF | 1041 MCFGR_WDENABLE | MCFGR_LARGE_BURST); 1042 1043 handle_imx6_err005766(&ctrl->mcr); 1044 1045 /* 1046 * Read the Compile Time parameters and SCFGR to determine 1047 * if virtualization is enabled for this platform 1048 */ 1049 scfgr = rd_reg32(&ctrl->scfgr); 1050 1051 ctrlpriv->virt_en = 0; 1052 if (comp_params & CTPR_MS_VIRT_EN_INCL) { 1053 /* VIRT_EN_INCL = 1 & VIRT_EN_POR = 1 or 1054 * VIRT_EN_INCL = 1 & VIRT_EN_POR = 0 & SCFGR_VIRT_EN = 1 1055 */ 1056 if ((comp_params & CTPR_MS_VIRT_EN_POR) || 1057 (!(comp_params & CTPR_MS_VIRT_EN_POR) && 1058 (scfgr & SCFGR_VIRT_EN))) 1059 ctrlpriv->virt_en = 1; 1060 } else { 1061 /* VIRT_EN_INCL = 0 && VIRT_EN_POR_VALUE = 1 */ 1062 if (comp_params & CTPR_MS_VIRT_EN_POR) 1063 ctrlpriv->virt_en = 1; 1064 } 1065 1066 if (ctrlpriv->virt_en == 1) 1067 clrsetbits_32(&ctrl->jrstart, 0, JRSTART_JR0_START | 1068 JRSTART_JR1_START | JRSTART_JR2_START | 1069 JRSTART_JR3_START); 1070 1071 set_dma_mask: 1072 ret = dma_set_mask_and_coherent(dev, caam_get_dma_mask(dev)); 1073 if (ret) { 1074 dev_err(dev, "dma_set_mask_and_coherent failed (%d)\n", ret); 1075 return ret; 1076 } 1077 1078 ctrlpriv->era = caam_get_era(perfmon); 1079 ctrlpriv->domain = iommu_get_domain_for_dev(dev); 1080 1081 dfs_root = debugfs_create_dir(dev_name(dev), NULL); 1082 if (IS_ENABLED(CONFIG_DEBUG_FS)) { 1083 ret = devm_add_action_or_reset(dev, caam_remove_debugfs, 1084 dfs_root); 1085 if (ret) 1086 return ret; 1087 } 1088 1089 caam_debugfs_init(ctrlpriv, perfmon, dfs_root); 1090 1091 /* Check to see if (DPAA 1.x) QI present. If so, enable */ 1092 if (ctrlpriv->qi_present && !caam_dpaa2) { 1093 ctrlpriv->qi = (struct caam_queue_if __iomem __force *) 1094 ((__force uint8_t *)ctrl + 1095 BLOCK_OFFSET * QI_BLOCK_NUMBER 1096 ); 1097 /* This is all that's required to physically enable QI */ 1098 wr_reg32(&ctrlpriv->qi->qi_control_lo, QICTL_DQEN); 1099 1100 /* If QMAN driver is present, init CAAM-QI backend */ 1101 #ifdef CONFIG_CAAM_QI 1102 ret = caam_qi_init(pdev); 1103 if (ret) 1104 dev_err(dev, "caam qi i/f init failed: %d\n", ret); 1105 #endif 1106 } 1107 1108 /* If no QI and no rings specified, quit and go home */ 1109 if ((!ctrlpriv->qi_present) && (!ctrlpriv->total_jobrs)) { 1110 dev_err(dev, "no queues configured, terminating\n"); 1111 return -ENOMEM; 1112 } 1113 1114 comp_params = rd_reg32(&perfmon->comp_parms_ls); 1115 ctrlpriv->blob_present = !!(comp_params & CTPR_LS_BLOB); 1116 1117 /* 1118 * Some SoCs like the LS1028A (non-E) indicate CTPR_LS_BLOB support, 1119 * but fail when actually using it due to missing AES support, so 1120 * check both here. 1121 */ 1122 if (ctrlpriv->era < 10) { 1123 ctrlpriv->blob_present = ctrlpriv->blob_present && 1124 (rd_reg32(&perfmon->cha_num_ls) & CHA_ID_LS_AES_MASK); 1125 } else { 1126 struct version_regs __iomem *vreg; 1127 1128 vreg = ctrlpriv->total_jobrs ? 1129 (struct version_regs __iomem *)&ctrlpriv->jr[0]->vreg : 1130 (struct version_regs __iomem *)&ctrl->vreg; 1131 1132 ctrlpriv->blob_present = ctrlpriv->blob_present && 1133 (rd_reg32(&vreg->aesa) & CHA_VER_MISC_AES_NUM_MASK); 1134 } 1135 1136 if (reg_access) { 1137 ret = caam_ctrl_rng_init(dev); 1138 if (ret) 1139 return ret; 1140 } 1141 1142 caam_id = (u64)rd_reg32(&perfmon->caam_id_ms) << 32 | 1143 (u64)rd_reg32(&perfmon->caam_id_ls); 1144 1145 /* Report "alive" for developer to see */ 1146 dev_info(dev, "device ID = 0x%016llx (Era %d)\n", caam_id, 1147 ctrlpriv->era); 1148 dev_info(dev, "job rings = %d, qi = %d\n", 1149 ctrlpriv->total_jobrs, ctrlpriv->qi_present); 1150 1151 ret = devm_of_platform_populate(dev); 1152 if (ret) 1153 dev_err(dev, "JR platform devices creation error\n"); 1154 1155 return ret; 1156 } 1157 1158 static struct platform_driver caam_driver = { 1159 .driver = { 1160 .name = "caam", 1161 .of_match_table = caam_match, 1162 .pm = pm_ptr(&caam_ctrl_pm_ops), 1163 }, 1164 .probe = caam_probe, 1165 }; 1166 1167 module_platform_driver(caam_driver); 1168 1169 MODULE_LICENSE("GPL"); 1170 MODULE_DESCRIPTION("FSL CAAM request backend"); 1171 MODULE_AUTHOR("Freescale Semiconductor - NMG/STC"); 1172