1 // SPDX-License-Identifier: GPL-2.0 2 /* Copyright (C) 2012-2019 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 #include <linux/of_device.h> 18 #include <linux/pm_runtime.h> 19 20 #include "cc_driver.h" 21 #include "cc_request_mgr.h" 22 #include "cc_buffer_mgr.h" 23 #include "cc_debugfs.h" 24 #include "cc_cipher.h" 25 #include "cc_aead.h" 26 #include "cc_hash.h" 27 #include "cc_sram_mgr.h" 28 #include "cc_pm.h" 29 #include "cc_fips.h" 30 31 bool cc_dump_desc; 32 module_param_named(dump_desc, cc_dump_desc, bool, 0600); 33 MODULE_PARM_DESC(cc_dump_desc, "Dump descriptors to kernel log as debugging aid"); 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 static bool cc_sec_disable; 39 module_param_named(sec_disable, cc_sec_disable, bool, 0600); 40 MODULE_PARM_DESC(cc_sec_disable, "Disable security functions"); 41 42 struct cc_hw_data { 43 char *name; 44 enum cc_hw_rev rev; 45 u32 sig; 46 u32 cidr_0123; 47 u32 pidr_0124; 48 int std_bodies; 49 }; 50 51 #define CC_NUM_IDRS 4 52 #define CC_HW_RESET_LOOP_COUNT 10 53 54 /* Note: PIDR3 holds CMOD/Rev so ignored for HW identification purposes */ 55 static const u32 pidr_0124_offsets[CC_NUM_IDRS] = { 56 CC_REG(PERIPHERAL_ID_0), CC_REG(PERIPHERAL_ID_1), 57 CC_REG(PERIPHERAL_ID_2), CC_REG(PERIPHERAL_ID_4) 58 }; 59 60 static const u32 cidr_0123_offsets[CC_NUM_IDRS] = { 61 CC_REG(COMPONENT_ID_0), CC_REG(COMPONENT_ID_1), 62 CC_REG(COMPONENT_ID_2), CC_REG(COMPONENT_ID_3) 63 }; 64 65 /* Hardware revisions defs. */ 66 67 /* The 703 is a OSCCA only variant of the 713 */ 68 static const struct cc_hw_data cc703_hw = { 69 .name = "703", .rev = CC_HW_REV_713, .cidr_0123 = 0xB105F00DU, 70 .pidr_0124 = 0x040BB0D0U, .std_bodies = CC_STD_OSCCA 71 }; 72 73 static const struct cc_hw_data cc713_hw = { 74 .name = "713", .rev = CC_HW_REV_713, .cidr_0123 = 0xB105F00DU, 75 .pidr_0124 = 0x040BB0D0U, .std_bodies = CC_STD_ALL 76 }; 77 78 static const struct cc_hw_data cc712_hw = { 79 .name = "712", .rev = CC_HW_REV_712, .sig = 0xDCC71200U, 80 .std_bodies = CC_STD_ALL 81 }; 82 83 static const struct cc_hw_data cc710_hw = { 84 .name = "710", .rev = CC_HW_REV_710, .sig = 0xDCC63200U, 85 .std_bodies = CC_STD_ALL 86 }; 87 88 static const struct cc_hw_data cc630p_hw = { 89 .name = "630P", .rev = CC_HW_REV_630, .sig = 0xDCC63000U, 90 .std_bodies = CC_STD_ALL 91 }; 92 93 static const struct of_device_id arm_ccree_dev_of_match[] = { 94 { .compatible = "arm,cryptocell-703-ree", .data = &cc703_hw }, 95 { .compatible = "arm,cryptocell-713-ree", .data = &cc713_hw }, 96 { .compatible = "arm,cryptocell-712-ree", .data = &cc712_hw }, 97 { .compatible = "arm,cryptocell-710-ree", .data = &cc710_hw }, 98 { .compatible = "arm,cryptocell-630p-ree", .data = &cc630p_hw }, 99 {} 100 }; 101 MODULE_DEVICE_TABLE(of, arm_ccree_dev_of_match); 102 103 static u32 cc_read_idr(struct cc_drvdata *drvdata, const u32 *idr_offsets) 104 { 105 int i; 106 union { 107 u8 regs[CC_NUM_IDRS]; 108 __le32 val; 109 } idr; 110 111 for (i = 0; i < CC_NUM_IDRS; ++i) 112 idr.regs[i] = cc_ioread(drvdata, idr_offsets[i]); 113 114 return le32_to_cpu(idr.val); 115 } 116 117 void __dump_byte_array(const char *name, const u8 *buf, size_t len) 118 { 119 char prefix[64]; 120 121 if (!buf) 122 return; 123 124 snprintf(prefix, sizeof(prefix), "%s[%zu]: ", name, len); 125 126 print_hex_dump(KERN_DEBUG, prefix, DUMP_PREFIX_ADDRESS, 16, 1, buf, 127 len, false); 128 } 129 130 static irqreturn_t cc_isr(int irq, void *dev_id) 131 { 132 struct cc_drvdata *drvdata = (struct cc_drvdata *)dev_id; 133 struct device *dev = drvdata_to_dev(drvdata); 134 u32 irr; 135 u32 imr; 136 137 /* STAT_OP_TYPE_GENERIC STAT_PHASE_0: Interrupt */ 138 /* if driver suspended return, probably shared interrupt */ 139 if (pm_runtime_suspended(dev)) 140 return IRQ_NONE; 141 142 /* read the interrupt status */ 143 irr = cc_ioread(drvdata, CC_REG(HOST_IRR)); 144 dev_dbg(dev, "Got IRR=0x%08X\n", irr); 145 146 if (irr == 0) /* Probably shared interrupt line */ 147 return IRQ_NONE; 148 149 imr = cc_ioread(drvdata, CC_REG(HOST_IMR)); 150 151 /* clear interrupt - must be before processing events */ 152 cc_iowrite(drvdata, CC_REG(HOST_ICR), irr); 153 154 drvdata->irq = irr; 155 /* Completion interrupt - most probable */ 156 if (irr & drvdata->comp_mask) { 157 /* Mask all completion interrupts - will be unmasked in 158 * deferred service handler 159 */ 160 cc_iowrite(drvdata, CC_REG(HOST_IMR), imr | drvdata->comp_mask); 161 irr &= ~drvdata->comp_mask; 162 complete_request(drvdata); 163 } 164 #ifdef CONFIG_CRYPTO_FIPS 165 /* TEE FIPS interrupt */ 166 if (irr & CC_GPR0_IRQ_MASK) { 167 /* Mask interrupt - will be unmasked in Deferred service 168 * handler 169 */ 170 cc_iowrite(drvdata, CC_REG(HOST_IMR), imr | CC_GPR0_IRQ_MASK); 171 irr &= ~CC_GPR0_IRQ_MASK; 172 fips_handler(drvdata); 173 } 174 #endif 175 /* AXI error interrupt */ 176 if (irr & CC_AXI_ERR_IRQ_MASK) { 177 u32 axi_err; 178 179 /* Read the AXI error ID */ 180 axi_err = cc_ioread(drvdata, CC_REG(AXIM_MON_ERR)); 181 dev_dbg(dev, "AXI completion error: axim_mon_err=0x%08X\n", 182 axi_err); 183 184 irr &= ~CC_AXI_ERR_IRQ_MASK; 185 } 186 187 if (irr) { 188 dev_dbg_ratelimited(dev, "IRR includes unknown cause bits (0x%08X)\n", 189 irr); 190 /* Just warning */ 191 } 192 193 return IRQ_HANDLED; 194 } 195 196 bool cc_wait_for_reset_completion(struct cc_drvdata *drvdata) 197 { 198 unsigned int val; 199 unsigned int i; 200 201 /* 712/710/63 has no reset completion indication, always return true */ 202 if (drvdata->hw_rev <= CC_HW_REV_712) 203 return true; 204 205 for (i = 0; i < CC_HW_RESET_LOOP_COUNT; i++) { 206 /* in cc7x3 NVM_IS_IDLE indicates that CC reset is 207 * completed and device is fully functional 208 */ 209 val = cc_ioread(drvdata, CC_REG(NVM_IS_IDLE)); 210 if (val & CC_NVM_IS_IDLE_MASK) { 211 /* hw indicate reset completed */ 212 return true; 213 } 214 /* allow scheduling other process on the processor */ 215 schedule(); 216 } 217 /* reset not completed */ 218 return false; 219 } 220 221 int init_cc_regs(struct cc_drvdata *drvdata, bool is_probe) 222 { 223 unsigned int val, cache_params; 224 struct device *dev = drvdata_to_dev(drvdata); 225 226 /* Unmask all AXI interrupt sources AXI_CFG1 register */ 227 /* AXI interrupt config are obsoleted startign at cc7x3 */ 228 if (drvdata->hw_rev <= CC_HW_REV_712) { 229 val = cc_ioread(drvdata, CC_REG(AXIM_CFG)); 230 cc_iowrite(drvdata, CC_REG(AXIM_CFG), val & ~CC_AXI_IRQ_MASK); 231 dev_dbg(dev, "AXIM_CFG=0x%08X\n", 232 cc_ioread(drvdata, CC_REG(AXIM_CFG))); 233 } 234 235 /* Clear all pending interrupts */ 236 val = cc_ioread(drvdata, CC_REG(HOST_IRR)); 237 dev_dbg(dev, "IRR=0x%08X\n", val); 238 cc_iowrite(drvdata, CC_REG(HOST_ICR), val); 239 240 /* Unmask relevant interrupt cause */ 241 val = drvdata->comp_mask | CC_AXI_ERR_IRQ_MASK; 242 243 if (drvdata->hw_rev >= CC_HW_REV_712) 244 val |= CC_GPR0_IRQ_MASK; 245 246 cc_iowrite(drvdata, CC_REG(HOST_IMR), ~val); 247 248 cache_params = (drvdata->coherent ? CC_COHERENT_CACHE_PARAMS : 0x0); 249 250 val = cc_ioread(drvdata, CC_REG(AXIM_CACHE_PARAMS)); 251 252 if (is_probe) 253 dev_dbg(dev, "Cache params previous: 0x%08X\n", val); 254 255 cc_iowrite(drvdata, CC_REG(AXIM_CACHE_PARAMS), cache_params); 256 val = cc_ioread(drvdata, CC_REG(AXIM_CACHE_PARAMS)); 257 258 if (is_probe) 259 dev_dbg(dev, "Cache params current: 0x%08X (expect: 0x%08X)\n", 260 val, cache_params); 261 262 return 0; 263 } 264 265 static int init_cc_resources(struct platform_device *plat_dev) 266 { 267 struct resource *req_mem_cc_regs = NULL; 268 struct cc_drvdata *new_drvdata; 269 struct device *dev = &plat_dev->dev; 270 struct device_node *np = dev->of_node; 271 u32 val, hw_rev_pidr, sig_cidr; 272 u64 dma_mask; 273 const struct cc_hw_data *hw_rev; 274 struct clk *clk; 275 int irq; 276 int rc = 0; 277 278 new_drvdata = devm_kzalloc(dev, sizeof(*new_drvdata), GFP_KERNEL); 279 if (!new_drvdata) 280 return -ENOMEM; 281 282 hw_rev = of_device_get_match_data(dev); 283 new_drvdata->hw_rev_name = hw_rev->name; 284 new_drvdata->hw_rev = hw_rev->rev; 285 new_drvdata->std_bodies = hw_rev->std_bodies; 286 287 if (hw_rev->rev >= CC_HW_REV_712) { 288 new_drvdata->axim_mon_offset = CC_REG(AXIM_MON_COMP); 289 new_drvdata->sig_offset = CC_REG(HOST_SIGNATURE_712); 290 new_drvdata->ver_offset = CC_REG(HOST_VERSION_712); 291 } else { 292 new_drvdata->axim_mon_offset = CC_REG(AXIM_MON_COMP8); 293 new_drvdata->sig_offset = CC_REG(HOST_SIGNATURE_630); 294 new_drvdata->ver_offset = CC_REG(HOST_VERSION_630); 295 } 296 297 new_drvdata->comp_mask = CC_COMP_IRQ_MASK; 298 299 platform_set_drvdata(plat_dev, new_drvdata); 300 new_drvdata->plat_dev = plat_dev; 301 302 clk = devm_clk_get_optional(dev, NULL); 303 if (IS_ERR(clk)) 304 return dev_err_probe(dev, PTR_ERR(clk), "Error getting clock\n"); 305 new_drvdata->clk = clk; 306 307 new_drvdata->coherent = of_dma_is_coherent(np); 308 309 /* Get device resources */ 310 /* First CC registers space */ 311 req_mem_cc_regs = platform_get_resource(plat_dev, IORESOURCE_MEM, 0); 312 /* Map registers space */ 313 new_drvdata->cc_base = devm_ioremap_resource(dev, req_mem_cc_regs); 314 if (IS_ERR(new_drvdata->cc_base)) { 315 dev_err(dev, "Failed to ioremap registers"); 316 return PTR_ERR(new_drvdata->cc_base); 317 } 318 319 dev_dbg(dev, "Got MEM resource (%s): %pR\n", req_mem_cc_regs->name, 320 req_mem_cc_regs); 321 dev_dbg(dev, "CC registers mapped from %pa to 0x%p\n", 322 &req_mem_cc_regs->start, new_drvdata->cc_base); 323 324 /* Then IRQ */ 325 irq = platform_get_irq(plat_dev, 0); 326 if (irq < 0) 327 return irq; 328 329 init_completion(&new_drvdata->hw_queue_avail); 330 331 if (!dev->dma_mask) 332 dev->dma_mask = &dev->coherent_dma_mask; 333 334 dma_mask = DMA_BIT_MASK(DMA_BIT_MASK_LEN); 335 while (dma_mask > 0x7fffffffUL) { 336 if (dma_supported(dev, dma_mask)) { 337 rc = dma_set_coherent_mask(dev, dma_mask); 338 if (!rc) 339 break; 340 } 341 dma_mask >>= 1; 342 } 343 344 if (rc) { 345 dev_err(dev, "Failed in dma_set_mask, mask=%llx\n", dma_mask); 346 return rc; 347 } 348 349 rc = clk_prepare_enable(new_drvdata->clk); 350 if (rc) { 351 dev_err(dev, "Failed to enable clock"); 352 return rc; 353 } 354 355 new_drvdata->sec_disabled = cc_sec_disable; 356 357 pm_runtime_set_autosuspend_delay(dev, CC_SUSPEND_TIMEOUT); 358 pm_runtime_use_autosuspend(dev); 359 pm_runtime_set_active(dev); 360 pm_runtime_enable(dev); 361 rc = pm_runtime_get_sync(dev); 362 if (rc < 0) { 363 dev_err(dev, "pm_runtime_get_sync() failed: %d\n", rc); 364 goto post_pm_err; 365 } 366 367 /* Wait for Cryptocell reset completion */ 368 if (!cc_wait_for_reset_completion(new_drvdata)) { 369 dev_err(dev, "Cryptocell reset not completed"); 370 } 371 372 if (hw_rev->rev <= CC_HW_REV_712) { 373 /* Verify correct mapping */ 374 val = cc_ioread(new_drvdata, new_drvdata->sig_offset); 375 if (val != hw_rev->sig) { 376 dev_err(dev, "Invalid CC signature: SIGNATURE=0x%08X != expected=0x%08X\n", 377 val, hw_rev->sig); 378 rc = -EINVAL; 379 goto post_pm_err; 380 } 381 sig_cidr = val; 382 hw_rev_pidr = cc_ioread(new_drvdata, new_drvdata->ver_offset); 383 } else { 384 /* Verify correct mapping */ 385 val = cc_read_idr(new_drvdata, pidr_0124_offsets); 386 if (val != hw_rev->pidr_0124) { 387 dev_err(dev, "Invalid CC PIDR: PIDR0124=0x%08X != expected=0x%08X\n", 388 val, hw_rev->pidr_0124); 389 rc = -EINVAL; 390 goto post_pm_err; 391 } 392 hw_rev_pidr = val; 393 394 val = cc_read_idr(new_drvdata, cidr_0123_offsets); 395 if (val != hw_rev->cidr_0123) { 396 dev_err(dev, "Invalid CC CIDR: CIDR0123=0x%08X != expected=0x%08X\n", 397 val, hw_rev->cidr_0123); 398 rc = -EINVAL; 399 goto post_pm_err; 400 } 401 sig_cidr = val; 402 403 /* Check HW engine configuration */ 404 val = cc_ioread(new_drvdata, CC_REG(HOST_REMOVE_INPUT_PINS)); 405 switch (val) { 406 case CC_PINS_FULL: 407 /* This is fine */ 408 break; 409 case CC_PINS_SLIM: 410 if (new_drvdata->std_bodies & CC_STD_NIST) { 411 dev_warn(dev, "703 mode forced due to HW configuration.\n"); 412 new_drvdata->std_bodies = CC_STD_OSCCA; 413 } 414 break; 415 default: 416 dev_err(dev, "Unsupported engines configuration.\n"); 417 rc = -EINVAL; 418 goto post_pm_err; 419 } 420 421 /* Check security disable state */ 422 val = cc_ioread(new_drvdata, CC_REG(SECURITY_DISABLED)); 423 val &= CC_SECURITY_DISABLED_MASK; 424 new_drvdata->sec_disabled |= !!val; 425 426 if (!new_drvdata->sec_disabled) { 427 new_drvdata->comp_mask |= CC_CPP_SM4_ABORT_MASK; 428 if (new_drvdata->std_bodies & CC_STD_NIST) 429 new_drvdata->comp_mask |= CC_CPP_AES_ABORT_MASK; 430 } 431 } 432 433 if (new_drvdata->sec_disabled) 434 dev_info(dev, "Security Disabled mode is in effect. Security functions disabled.\n"); 435 436 /* Display HW versions */ 437 dev_info(dev, "ARM CryptoCell %s Driver: HW version 0x%08X/0x%8X, Driver version %s\n", 438 hw_rev->name, hw_rev_pidr, sig_cidr, DRV_MODULE_VERSION); 439 /* register the driver isr function */ 440 rc = devm_request_irq(dev, irq, cc_isr, IRQF_SHARED, "ccree", 441 new_drvdata); 442 if (rc) { 443 dev_err(dev, "Could not register to interrupt %d\n", irq); 444 goto post_pm_err; 445 } 446 dev_dbg(dev, "Registered to IRQ: %d\n", irq); 447 448 rc = init_cc_regs(new_drvdata, true); 449 if (rc) { 450 dev_err(dev, "init_cc_regs failed\n"); 451 goto post_pm_err; 452 } 453 454 rc = cc_debugfs_init(new_drvdata); 455 if (rc) { 456 dev_err(dev, "Failed registering debugfs interface\n"); 457 goto post_regs_err; 458 } 459 460 rc = cc_fips_init(new_drvdata); 461 if (rc) { 462 dev_err(dev, "cc_fips_init failed 0x%x\n", rc); 463 goto post_debugfs_err; 464 } 465 rc = cc_sram_mgr_init(new_drvdata); 466 if (rc) { 467 dev_err(dev, "cc_sram_mgr_init failed\n"); 468 goto post_fips_init_err; 469 } 470 471 new_drvdata->mlli_sram_addr = 472 cc_sram_alloc(new_drvdata, MAX_MLLI_BUFF_SIZE); 473 if (new_drvdata->mlli_sram_addr == NULL_SRAM_ADDR) { 474 rc = -ENOMEM; 475 goto post_fips_init_err; 476 } 477 478 rc = cc_req_mgr_init(new_drvdata); 479 if (rc) { 480 dev_err(dev, "cc_req_mgr_init failed\n"); 481 goto post_fips_init_err; 482 } 483 484 rc = cc_buffer_mgr_init(new_drvdata); 485 if (rc) { 486 dev_err(dev, "cc_buffer_mgr_init failed\n"); 487 goto post_req_mgr_err; 488 } 489 490 /* Allocate crypto algs */ 491 rc = cc_cipher_alloc(new_drvdata); 492 if (rc) { 493 dev_err(dev, "cc_cipher_alloc failed\n"); 494 goto post_buf_mgr_err; 495 } 496 497 /* hash must be allocated before aead since hash exports APIs */ 498 rc = cc_hash_alloc(new_drvdata); 499 if (rc) { 500 dev_err(dev, "cc_hash_alloc failed\n"); 501 goto post_cipher_err; 502 } 503 504 rc = cc_aead_alloc(new_drvdata); 505 if (rc) { 506 dev_err(dev, "cc_aead_alloc failed\n"); 507 goto post_hash_err; 508 } 509 510 /* If we got here and FIPS mode is enabled 511 * it means all FIPS test passed, so let TEE 512 * know we're good. 513 */ 514 cc_set_ree_fips_status(new_drvdata, true); 515 516 pm_runtime_put(dev); 517 return 0; 518 519 post_hash_err: 520 cc_hash_free(new_drvdata); 521 post_cipher_err: 522 cc_cipher_free(new_drvdata); 523 post_buf_mgr_err: 524 cc_buffer_mgr_fini(new_drvdata); 525 post_req_mgr_err: 526 cc_req_mgr_fini(new_drvdata); 527 post_fips_init_err: 528 cc_fips_fini(new_drvdata); 529 post_debugfs_err: 530 cc_debugfs_fini(new_drvdata); 531 post_regs_err: 532 fini_cc_regs(new_drvdata); 533 post_pm_err: 534 pm_runtime_put_noidle(dev); 535 pm_runtime_disable(dev); 536 pm_runtime_set_suspended(dev); 537 clk_disable_unprepare(new_drvdata->clk); 538 return rc; 539 } 540 541 void fini_cc_regs(struct cc_drvdata *drvdata) 542 { 543 /* Mask all interrupts */ 544 cc_iowrite(drvdata, CC_REG(HOST_IMR), 0xFFFFFFFF); 545 } 546 547 static void cleanup_cc_resources(struct platform_device *plat_dev) 548 { 549 struct device *dev = &plat_dev->dev; 550 struct cc_drvdata *drvdata = 551 (struct cc_drvdata *)platform_get_drvdata(plat_dev); 552 553 cc_aead_free(drvdata); 554 cc_hash_free(drvdata); 555 cc_cipher_free(drvdata); 556 cc_buffer_mgr_fini(drvdata); 557 cc_req_mgr_fini(drvdata); 558 cc_fips_fini(drvdata); 559 cc_debugfs_fini(drvdata); 560 fini_cc_regs(drvdata); 561 pm_runtime_put_noidle(dev); 562 pm_runtime_disable(dev); 563 pm_runtime_set_suspended(dev); 564 clk_disable_unprepare(drvdata->clk); 565 } 566 567 unsigned int cc_get_default_hash_len(struct cc_drvdata *drvdata) 568 { 569 if (drvdata->hw_rev >= CC_HW_REV_712) 570 return HASH_LEN_SIZE_712; 571 else 572 return HASH_LEN_SIZE_630; 573 } 574 575 static int ccree_probe(struct platform_device *plat_dev) 576 { 577 int rc; 578 struct device *dev = &plat_dev->dev; 579 580 /* Map registers space */ 581 rc = init_cc_resources(plat_dev); 582 if (rc) 583 return rc; 584 585 dev_info(dev, "ARM ccree device initialized\n"); 586 587 return 0; 588 } 589 590 static int ccree_remove(struct platform_device *plat_dev) 591 { 592 struct device *dev = &plat_dev->dev; 593 594 dev_dbg(dev, "Releasing ccree resources...\n"); 595 596 cleanup_cc_resources(plat_dev); 597 598 dev_info(dev, "ARM ccree device terminated\n"); 599 600 return 0; 601 } 602 603 static struct platform_driver ccree_driver = { 604 .driver = { 605 .name = "ccree", 606 .of_match_table = arm_ccree_dev_of_match, 607 #ifdef CONFIG_PM 608 .pm = &ccree_pm, 609 #endif 610 }, 611 .probe = ccree_probe, 612 .remove = ccree_remove, 613 }; 614 615 static int __init ccree_init(void) 616 { 617 cc_debugfs_global_init(); 618 619 return platform_driver_register(&ccree_driver); 620 } 621 module_init(ccree_init); 622 623 static void __exit ccree_exit(void) 624 { 625 platform_driver_unregister(&ccree_driver); 626 cc_debugfs_global_fini(); 627 } 628 module_exit(ccree_exit); 629 630 /* Module description */ 631 MODULE_DESCRIPTION("ARM TrustZone CryptoCell REE Driver"); 632 MODULE_VERSION(DRV_MODULE_VERSION); 633 MODULE_AUTHOR("ARM"); 634 MODULE_LICENSE("GPL v2"); 635