1 // SPDX-License-Identifier: GPL-2.0 2 /* Copyright (C) 2012-2018 ARM Limited or its affiliates. */ 3 4 #include <linux/kernel.h> 5 #include <linux/module.h> 6 7 #include <linux/crypto.h> 8 #include <linux/moduleparam.h> 9 #include <linux/types.h> 10 #include <linux/interrupt.h> 11 #include <linux/platform_device.h> 12 #include <linux/slab.h> 13 #include <linux/spinlock.h> 14 #include <linux/of.h> 15 #include <linux/clk.h> 16 #include <linux/of_address.h> 17 18 #include "cc_driver.h" 19 #include "cc_request_mgr.h" 20 #include "cc_buffer_mgr.h" 21 #include "cc_debugfs.h" 22 #include "cc_cipher.h" 23 #include "cc_aead.h" 24 #include "cc_hash.h" 25 #include "cc_ivgen.h" 26 #include "cc_sram_mgr.h" 27 #include "cc_pm.h" 28 #include "cc_fips.h" 29 30 bool cc_dump_desc; 31 module_param_named(dump_desc, cc_dump_desc, bool, 0600); 32 MODULE_PARM_DESC(cc_dump_desc, "Dump descriptors to kernel log as debugging aid"); 33 34 bool cc_dump_bytes; 35 module_param_named(dump_bytes, cc_dump_bytes, bool, 0600); 36 MODULE_PARM_DESC(cc_dump_bytes, "Dump buffers to kernel log as debugging aid"); 37 38 struct cc_hw_data { 39 char *name; 40 enum cc_hw_rev rev; 41 u32 sig; 42 int std_bodies; 43 }; 44 45 /* Hardware revisions defs. */ 46 47 /* The 703 is a OSCCA only variant of the 713 */ 48 static const struct cc_hw_data cc703_hw = { 49 .name = "703", .rev = CC_HW_REV_713, .std_bodies = CC_STD_OSCCA 50 }; 51 52 static const struct cc_hw_data cc713_hw = { 53 .name = "713", .rev = CC_HW_REV_713, .std_bodies = CC_STD_ALL 54 }; 55 56 static const struct cc_hw_data cc712_hw = { 57 .name = "712", .rev = CC_HW_REV_712, .sig = 0xDCC71200U, 58 .std_bodies = CC_STD_ALL 59 }; 60 61 static const struct cc_hw_data cc710_hw = { 62 .name = "710", .rev = CC_HW_REV_710, .sig = 0xDCC63200U, 63 .std_bodies = CC_STD_ALL 64 }; 65 66 static const struct cc_hw_data cc630p_hw = { 67 .name = "630P", .rev = CC_HW_REV_630, .sig = 0xDCC63000U, 68 .std_bodies = CC_STD_ALL 69 }; 70 71 static const struct of_device_id arm_ccree_dev_of_match[] = { 72 { .compatible = "arm,cryptocell-703-ree", .data = &cc703_hw }, 73 { .compatible = "arm,cryptocell-713-ree", .data = &cc713_hw }, 74 { .compatible = "arm,cryptocell-712-ree", .data = &cc712_hw }, 75 { .compatible = "arm,cryptocell-710-ree", .data = &cc710_hw }, 76 { .compatible = "arm,cryptocell-630p-ree", .data = &cc630p_hw }, 77 {} 78 }; 79 MODULE_DEVICE_TABLE(of, arm_ccree_dev_of_match); 80 81 void __dump_byte_array(const char *name, const u8 *buf, size_t len) 82 { 83 char prefix[64]; 84 85 if (!buf) 86 return; 87 88 snprintf(prefix, sizeof(prefix), "%s[%zu]: ", name, len); 89 90 print_hex_dump(KERN_DEBUG, prefix, DUMP_PREFIX_ADDRESS, 16, 1, buf, 91 len, false); 92 } 93 94 static irqreturn_t cc_isr(int irq, void *dev_id) 95 { 96 struct cc_drvdata *drvdata = (struct cc_drvdata *)dev_id; 97 struct device *dev = drvdata_to_dev(drvdata); 98 u32 irr; 99 u32 imr; 100 101 /* STAT_OP_TYPE_GENERIC STAT_PHASE_0: Interrupt */ 102 103 /* read the interrupt status */ 104 irr = cc_ioread(drvdata, CC_REG(HOST_IRR)); 105 dev_dbg(dev, "Got IRR=0x%08X\n", irr); 106 if (irr == 0) { /* Probably shared interrupt line */ 107 dev_err(dev, "Got interrupt with empty IRR\n"); 108 return IRQ_NONE; 109 } 110 imr = cc_ioread(drvdata, CC_REG(HOST_IMR)); 111 112 /* clear interrupt - must be before processing events */ 113 cc_iowrite(drvdata, CC_REG(HOST_ICR), irr); 114 115 drvdata->irq = irr; 116 /* Completion interrupt - most probable */ 117 if (irr & CC_COMP_IRQ_MASK) { 118 /* Mask AXI completion interrupt - will be unmasked in 119 * Deferred service handler 120 */ 121 cc_iowrite(drvdata, CC_REG(HOST_IMR), imr | CC_COMP_IRQ_MASK); 122 irr &= ~CC_COMP_IRQ_MASK; 123 complete_request(drvdata); 124 } 125 #ifdef CONFIG_CRYPTO_FIPS 126 /* TEE FIPS interrupt */ 127 if (irr & CC_GPR0_IRQ_MASK) { 128 /* Mask interrupt - will be unmasked in Deferred service 129 * handler 130 */ 131 cc_iowrite(drvdata, CC_REG(HOST_IMR), imr | CC_GPR0_IRQ_MASK); 132 irr &= ~CC_GPR0_IRQ_MASK; 133 fips_handler(drvdata); 134 } 135 #endif 136 /* AXI error interrupt */ 137 if (irr & CC_AXI_ERR_IRQ_MASK) { 138 u32 axi_err; 139 140 /* Read the AXI error ID */ 141 axi_err = cc_ioread(drvdata, CC_REG(AXIM_MON_ERR)); 142 dev_dbg(dev, "AXI completion error: axim_mon_err=0x%08X\n", 143 axi_err); 144 145 irr &= ~CC_AXI_ERR_IRQ_MASK; 146 } 147 148 if (irr) { 149 dev_dbg_ratelimited(dev, "IRR includes unknown cause bits (0x%08X)\n", 150 irr); 151 /* Just warning */ 152 } 153 154 return IRQ_HANDLED; 155 } 156 157 int init_cc_regs(struct cc_drvdata *drvdata, bool is_probe) 158 { 159 unsigned int val, cache_params; 160 struct device *dev = drvdata_to_dev(drvdata); 161 162 /* Unmask all AXI interrupt sources AXI_CFG1 register */ 163 val = cc_ioread(drvdata, CC_REG(AXIM_CFG)); 164 cc_iowrite(drvdata, CC_REG(AXIM_CFG), val & ~CC_AXI_IRQ_MASK); 165 dev_dbg(dev, "AXIM_CFG=0x%08X\n", 166 cc_ioread(drvdata, CC_REG(AXIM_CFG))); 167 168 /* Clear all pending interrupts */ 169 val = cc_ioread(drvdata, CC_REG(HOST_IRR)); 170 dev_dbg(dev, "IRR=0x%08X\n", val); 171 cc_iowrite(drvdata, CC_REG(HOST_ICR), val); 172 173 /* Unmask relevant interrupt cause */ 174 val = CC_COMP_IRQ_MASK | CC_AXI_ERR_IRQ_MASK; 175 176 if (drvdata->hw_rev >= CC_HW_REV_712) 177 val |= CC_GPR0_IRQ_MASK; 178 179 cc_iowrite(drvdata, CC_REG(HOST_IMR), ~val); 180 181 cache_params = (drvdata->coherent ? CC_COHERENT_CACHE_PARAMS : 0x0); 182 183 val = cc_ioread(drvdata, CC_REG(AXIM_CACHE_PARAMS)); 184 185 if (is_probe) 186 dev_dbg(dev, "Cache params previous: 0x%08X\n", val); 187 188 cc_iowrite(drvdata, CC_REG(AXIM_CACHE_PARAMS), cache_params); 189 val = cc_ioread(drvdata, CC_REG(AXIM_CACHE_PARAMS)); 190 191 if (is_probe) 192 dev_dbg(dev, "Cache params current: 0x%08X (expect: 0x%08X)\n", 193 val, cache_params); 194 195 return 0; 196 } 197 198 static int init_cc_resources(struct platform_device *plat_dev) 199 { 200 struct resource *req_mem_cc_regs = NULL; 201 struct cc_drvdata *new_drvdata; 202 struct device *dev = &plat_dev->dev; 203 struct device_node *np = dev->of_node; 204 u32 signature_val; 205 u64 dma_mask; 206 const struct cc_hw_data *hw_rev; 207 const struct of_device_id *dev_id; 208 struct clk *clk; 209 int rc = 0; 210 211 new_drvdata = devm_kzalloc(dev, sizeof(*new_drvdata), GFP_KERNEL); 212 if (!new_drvdata) 213 return -ENOMEM; 214 215 dev_id = of_match_node(arm_ccree_dev_of_match, np); 216 if (!dev_id) 217 return -ENODEV; 218 219 hw_rev = (struct cc_hw_data *)dev_id->data; 220 new_drvdata->hw_rev_name = hw_rev->name; 221 new_drvdata->hw_rev = hw_rev->rev; 222 new_drvdata->std_bodies = hw_rev->std_bodies; 223 224 if (hw_rev->rev >= CC_HW_REV_712) { 225 new_drvdata->axim_mon_offset = CC_REG(AXIM_MON_COMP); 226 new_drvdata->sig_offset = CC_REG(HOST_SIGNATURE_712); 227 new_drvdata->ver_offset = CC_REG(HOST_VERSION_712); 228 } else { 229 new_drvdata->axim_mon_offset = CC_REG(AXIM_MON_COMP8); 230 new_drvdata->sig_offset = CC_REG(HOST_SIGNATURE_630); 231 new_drvdata->ver_offset = CC_REG(HOST_VERSION_630); 232 } 233 234 platform_set_drvdata(plat_dev, new_drvdata); 235 new_drvdata->plat_dev = plat_dev; 236 237 clk = devm_clk_get(dev, NULL); 238 if (IS_ERR(clk)) 239 switch (PTR_ERR(clk)) { 240 /* Clock is optional so this might be fine */ 241 case -ENOENT: 242 break; 243 244 /* Clock not available, let's try again soon */ 245 case -EPROBE_DEFER: 246 return -EPROBE_DEFER; 247 248 default: 249 dev_err(dev, "Error getting clock: %ld\n", 250 PTR_ERR(clk)); 251 return PTR_ERR(clk); 252 } 253 new_drvdata->clk = clk; 254 255 new_drvdata->coherent = of_dma_is_coherent(np); 256 257 /* Get device resources */ 258 /* First CC registers space */ 259 req_mem_cc_regs = platform_get_resource(plat_dev, IORESOURCE_MEM, 0); 260 /* Map registers space */ 261 new_drvdata->cc_base = devm_ioremap_resource(dev, req_mem_cc_regs); 262 if (IS_ERR(new_drvdata->cc_base)) { 263 dev_err(dev, "Failed to ioremap registers"); 264 return PTR_ERR(new_drvdata->cc_base); 265 } 266 267 dev_dbg(dev, "Got MEM resource (%s): %pR\n", req_mem_cc_regs->name, 268 req_mem_cc_regs); 269 dev_dbg(dev, "CC registers mapped from %pa to 0x%p\n", 270 &req_mem_cc_regs->start, new_drvdata->cc_base); 271 272 /* Then IRQ */ 273 new_drvdata->irq = platform_get_irq(plat_dev, 0); 274 if (new_drvdata->irq < 0) { 275 dev_err(dev, "Failed getting IRQ resource\n"); 276 return new_drvdata->irq; 277 } 278 279 rc = devm_request_irq(dev, new_drvdata->irq, cc_isr, 280 IRQF_SHARED, "ccree", new_drvdata); 281 if (rc) { 282 dev_err(dev, "Could not register to interrupt %d\n", 283 new_drvdata->irq); 284 return rc; 285 } 286 dev_dbg(dev, "Registered to IRQ: %d\n", new_drvdata->irq); 287 288 init_completion(&new_drvdata->hw_queue_avail); 289 290 if (!plat_dev->dev.dma_mask) 291 plat_dev->dev.dma_mask = &plat_dev->dev.coherent_dma_mask; 292 293 dma_mask = DMA_BIT_MASK(DMA_BIT_MASK_LEN); 294 while (dma_mask > 0x7fffffffUL) { 295 if (dma_supported(&plat_dev->dev, dma_mask)) { 296 rc = dma_set_coherent_mask(&plat_dev->dev, dma_mask); 297 if (!rc) 298 break; 299 } 300 dma_mask >>= 1; 301 } 302 303 if (rc) { 304 dev_err(dev, "Failed in dma_set_mask, mask=%llx\n", dma_mask); 305 return rc; 306 } 307 308 rc = cc_clk_on(new_drvdata); 309 if (rc) { 310 dev_err(dev, "Failed to enable clock"); 311 return rc; 312 } 313 314 if (hw_rev->rev <= CC_HW_REV_712) { 315 /* Verify correct mapping */ 316 signature_val = cc_ioread(new_drvdata, new_drvdata->sig_offset); 317 if (signature_val != hw_rev->sig) { 318 dev_err(dev, "Invalid CC signature: SIGNATURE=0x%08X != expected=0x%08X\n", 319 signature_val, hw_rev->sig); 320 rc = -EINVAL; 321 goto post_clk_err; 322 } 323 dev_dbg(dev, "CC SIGNATURE=0x%08X\n", signature_val); 324 } 325 326 /* Display HW versions */ 327 dev_info(dev, "ARM CryptoCell %s Driver: HW version 0x%08X, Driver version %s\n", 328 hw_rev->name, cc_ioread(new_drvdata, new_drvdata->ver_offset), 329 DRV_MODULE_VERSION); 330 331 rc = init_cc_regs(new_drvdata, true); 332 if (rc) { 333 dev_err(dev, "init_cc_regs failed\n"); 334 goto post_clk_err; 335 } 336 337 rc = cc_debugfs_init(new_drvdata); 338 if (rc) { 339 dev_err(dev, "Failed registering debugfs interface\n"); 340 goto post_regs_err; 341 } 342 343 rc = cc_fips_init(new_drvdata); 344 if (rc) { 345 dev_err(dev, "CC_FIPS_INIT failed 0x%x\n", rc); 346 goto post_debugfs_err; 347 } 348 rc = cc_sram_mgr_init(new_drvdata); 349 if (rc) { 350 dev_err(dev, "cc_sram_mgr_init failed\n"); 351 goto post_fips_init_err; 352 } 353 354 new_drvdata->mlli_sram_addr = 355 cc_sram_alloc(new_drvdata, MAX_MLLI_BUFF_SIZE); 356 if (new_drvdata->mlli_sram_addr == NULL_SRAM_ADDR) { 357 dev_err(dev, "Failed to alloc MLLI Sram buffer\n"); 358 rc = -ENOMEM; 359 goto post_sram_mgr_err; 360 } 361 362 rc = cc_req_mgr_init(new_drvdata); 363 if (rc) { 364 dev_err(dev, "cc_req_mgr_init failed\n"); 365 goto post_sram_mgr_err; 366 } 367 368 rc = cc_buffer_mgr_init(new_drvdata); 369 if (rc) { 370 dev_err(dev, "buffer_mgr_init failed\n"); 371 goto post_req_mgr_err; 372 } 373 374 rc = cc_pm_init(new_drvdata); 375 if (rc) { 376 dev_err(dev, "ssi_power_mgr_init failed\n"); 377 goto post_buf_mgr_err; 378 } 379 380 rc = cc_ivgen_init(new_drvdata); 381 if (rc) { 382 dev_err(dev, "cc_ivgen_init failed\n"); 383 goto post_power_mgr_err; 384 } 385 386 /* Allocate crypto algs */ 387 rc = cc_cipher_alloc(new_drvdata); 388 if (rc) { 389 dev_err(dev, "cc_cipher_alloc failed\n"); 390 goto post_ivgen_err; 391 } 392 393 /* hash must be allocated before aead since hash exports APIs */ 394 rc = cc_hash_alloc(new_drvdata); 395 if (rc) { 396 dev_err(dev, "cc_hash_alloc failed\n"); 397 goto post_cipher_err; 398 } 399 400 rc = cc_aead_alloc(new_drvdata); 401 if (rc) { 402 dev_err(dev, "cc_aead_alloc failed\n"); 403 goto post_hash_err; 404 } 405 406 /* If we got here and FIPS mode is enabled 407 * it means all FIPS test passed, so let TEE 408 * know we're good. 409 */ 410 cc_set_ree_fips_status(new_drvdata, true); 411 412 return 0; 413 414 post_hash_err: 415 cc_hash_free(new_drvdata); 416 post_cipher_err: 417 cc_cipher_free(new_drvdata); 418 post_ivgen_err: 419 cc_ivgen_fini(new_drvdata); 420 post_power_mgr_err: 421 cc_pm_fini(new_drvdata); 422 post_buf_mgr_err: 423 cc_buffer_mgr_fini(new_drvdata); 424 post_req_mgr_err: 425 cc_req_mgr_fini(new_drvdata); 426 post_sram_mgr_err: 427 cc_sram_mgr_fini(new_drvdata); 428 post_fips_init_err: 429 cc_fips_fini(new_drvdata); 430 post_debugfs_err: 431 cc_debugfs_fini(new_drvdata); 432 post_regs_err: 433 fini_cc_regs(new_drvdata); 434 post_clk_err: 435 cc_clk_off(new_drvdata); 436 return rc; 437 } 438 439 void fini_cc_regs(struct cc_drvdata *drvdata) 440 { 441 /* Mask all interrupts */ 442 cc_iowrite(drvdata, CC_REG(HOST_IMR), 0xFFFFFFFF); 443 } 444 445 static void cleanup_cc_resources(struct platform_device *plat_dev) 446 { 447 struct cc_drvdata *drvdata = 448 (struct cc_drvdata *)platform_get_drvdata(plat_dev); 449 450 cc_aead_free(drvdata); 451 cc_hash_free(drvdata); 452 cc_cipher_free(drvdata); 453 cc_ivgen_fini(drvdata); 454 cc_pm_fini(drvdata); 455 cc_buffer_mgr_fini(drvdata); 456 cc_req_mgr_fini(drvdata); 457 cc_sram_mgr_fini(drvdata); 458 cc_fips_fini(drvdata); 459 cc_debugfs_fini(drvdata); 460 fini_cc_regs(drvdata); 461 cc_clk_off(drvdata); 462 } 463 464 int cc_clk_on(struct cc_drvdata *drvdata) 465 { 466 struct clk *clk = drvdata->clk; 467 int rc; 468 469 if (IS_ERR(clk)) 470 /* Not all devices have a clock associated with CCREE */ 471 return 0; 472 473 rc = clk_prepare_enable(clk); 474 if (rc) 475 return rc; 476 477 return 0; 478 } 479 480 unsigned int cc_get_default_hash_len(struct cc_drvdata *drvdata) 481 { 482 if (drvdata->hw_rev >= CC_HW_REV_712) 483 return HASH_LEN_SIZE_712; 484 else 485 return HASH_LEN_SIZE_630; 486 } 487 488 void cc_clk_off(struct cc_drvdata *drvdata) 489 { 490 struct clk *clk = drvdata->clk; 491 492 if (IS_ERR(clk)) 493 /* Not all devices have a clock associated with CCREE */ 494 return; 495 496 clk_disable_unprepare(clk); 497 } 498 499 static int ccree_probe(struct platform_device *plat_dev) 500 { 501 int rc; 502 struct device *dev = &plat_dev->dev; 503 504 /* Map registers space */ 505 rc = init_cc_resources(plat_dev); 506 if (rc) 507 return rc; 508 509 dev_info(dev, "ARM ccree device initialized\n"); 510 511 return 0; 512 } 513 514 static int ccree_remove(struct platform_device *plat_dev) 515 { 516 struct device *dev = &plat_dev->dev; 517 518 dev_dbg(dev, "Releasing ccree resources...\n"); 519 520 cleanup_cc_resources(plat_dev); 521 522 dev_info(dev, "ARM ccree device terminated\n"); 523 524 return 0; 525 } 526 527 static struct platform_driver ccree_driver = { 528 .driver = { 529 .name = "ccree", 530 .of_match_table = arm_ccree_dev_of_match, 531 #ifdef CONFIG_PM 532 .pm = &ccree_pm, 533 #endif 534 }, 535 .probe = ccree_probe, 536 .remove = ccree_remove, 537 }; 538 539 static int __init ccree_init(void) 540 { 541 int ret; 542 543 cc_hash_global_init(); 544 545 ret = cc_debugfs_global_init(); 546 if (ret) 547 return ret; 548 549 return platform_driver_register(&ccree_driver); 550 } 551 module_init(ccree_init); 552 553 static void __exit ccree_exit(void) 554 { 555 platform_driver_unregister(&ccree_driver); 556 cc_debugfs_global_fini(); 557 } 558 module_exit(ccree_exit); 559 560 /* Module description */ 561 MODULE_DESCRIPTION("ARM TrustZone CryptoCell REE Driver"); 562 MODULE_VERSION(DRV_MODULE_VERSION); 563 MODULE_AUTHOR("ARM"); 564 MODULE_LICENSE("GPL v2"); 565