drivers/firmware/qcom_scm.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /* Copyright (c) 2010,2015,2019 The Linux Foundation. All rights reserved.
   3  * Copyright (C) 2015 Linaro Ltd.
   4  */
   5 #include <linux/platform_device.h>
   6 #include <linux/init.h>
   7 #include <linux/cpumask.h>
   8 #include <linux/export.h>
   9 #include <linux/dma-direct.h>
  10 #include <linux/dma-mapping.h>
  11 #include <linux/module.h>
  12 #include <linux/types.h>
  13 #include <linux/qcom_scm.h>
  14 #include <linux/of.h>
  15 #include <linux/of_address.h>
  16 #include <linux/of_platform.h>
  17 #include <linux/clk.h>
  18 #include <linux/reset-controller.h>
  19 #include <linux/arm-smccc.h>
  20
  21 #include "qcom_scm.h"
  22
  23 static bool download_mode = IS_ENABLED(CONFIG_QCOM_SCM_DOWNLOAD_MODE_DEFAULT);
  24 module_param(download_mode, bool, 0);
  25
  26 #define SCM_HAS_CORE_CLK        BIT(0)
  27 #define SCM_HAS_IFACE_CLK       BIT(1)
  28 #define SCM_HAS_BUS_CLK         BIT(2)
  29
  30 struct qcom_scm {
  31         struct device *dev;
  32         struct clk *core_clk;
  33         struct clk *iface_clk;
  34         struct clk *bus_clk;
  35         struct reset_controller_dev reset;
  36
  37         u64 dload_mode_addr;
  38 };
  39
  40 struct qcom_scm_current_perm_info {
  41         __le32 vmid;
  42         __le32 perm;
  43         __le64 ctx;
  44         __le32 ctx_size;
  45         __le32 unused;
  46 };
  47
  48 struct qcom_scm_mem_map_info {
  49         __le64 mem_addr;
  50         __le64 mem_size;
  51 };
  52
  53 #define QCOM_SCM_FLAG_COLDBOOT_CPU0     0x00
  54 #define QCOM_SCM_FLAG_COLDBOOT_CPU1     0x01
  55 #define QCOM_SCM_FLAG_COLDBOOT_CPU2     0x08
  56 #define QCOM_SCM_FLAG_COLDBOOT_CPU3     0x20
  57
  58 #define QCOM_SCM_FLAG_WARMBOOT_CPU0     0x04
  59 #define QCOM_SCM_FLAG_WARMBOOT_CPU1     0x02
  60 #define QCOM_SCM_FLAG_WARMBOOT_CPU2     0x10
  61 #define QCOM_SCM_FLAG_WARMBOOT_CPU3     0x40
  62
  63 struct qcom_scm_wb_entry {
  64         int flag;
  65         void *entry;
  66 };
  67
  68 static struct qcom_scm_wb_entry qcom_scm_wb[] = {
  69         { .flag = QCOM_SCM_FLAG_WARMBOOT_CPU0 },
  70         { .flag = QCOM_SCM_FLAG_WARMBOOT_CPU1 },
  71         { .flag = QCOM_SCM_FLAG_WARMBOOT_CPU2 },
  72         { .flag = QCOM_SCM_FLAG_WARMBOOT_CPU3 },
  73 };
  74
  75 static const char *qcom_scm_convention_names[] = {
  76         [SMC_CONVENTION_UNKNOWN] = "unknown",
  77         [SMC_CONVENTION_ARM_32] = "smc arm 32",
  78         [SMC_CONVENTION_ARM_64] = "smc arm 64",
  79         [SMC_CONVENTION_LEGACY] = "smc legacy",
  80 };
  81
  82 static struct qcom_scm *__scm;
  83
  84 static int qcom_scm_clk_enable(void)
  85 {
  86         int ret;
  87
  88         ret = clk_prepare_enable(__scm->core_clk);
  89         if (ret)
  90                 goto bail;
  91
  92         ret = clk_prepare_enable(__scm->iface_clk);
  93         if (ret)
  94                 goto disable_core;
  95
  96         ret = clk_prepare_enable(__scm->bus_clk);
  97         if (ret)
  98                 goto disable_iface;
  99
 100         return 0;
 101
 102 disable_iface:
 103         clk_disable_unprepare(__scm->iface_clk);
 104 disable_core:
 105         clk_disable_unprepare(__scm->core_clk);
 106 bail:
 107         return ret;
 108 }
 109
 110 static void qcom_scm_clk_disable(void)
 111 {
 112         clk_disable_unprepare(__scm->core_clk);
 113         clk_disable_unprepare(__scm->iface_clk);
 114         clk_disable_unprepare(__scm->bus_clk);
 115 }
 116
 117 static int __qcom_scm_is_call_available(struct device *dev, u32 svc_id,
 118                                         u32 cmd_id);
 119
 120 enum qcom_scm_convention qcom_scm_convention;
 121 static bool has_queried __read_mostly;
 122 static DEFINE_SPINLOCK(query_lock);
 123
 124 static void __query_convention(void)
 125 {
 126         unsigned long flags;
 127         struct qcom_scm_desc desc = {
 128                 .svc = QCOM_SCM_SVC_INFO,
 129                 .cmd = QCOM_SCM_INFO_IS_CALL_AVAIL,
 130                 .args[0] = SCM_SMC_FNID(QCOM_SCM_SVC_INFO,
 131                                            QCOM_SCM_INFO_IS_CALL_AVAIL) |
 132                            (ARM_SMCCC_OWNER_SIP << ARM_SMCCC_OWNER_SHIFT),
 133                 .arginfo = QCOM_SCM_ARGS(1),
 134                 .owner = ARM_SMCCC_OWNER_SIP,
 135         };
 136         struct qcom_scm_res res;
 137         int ret;
 138
 139         spin_lock_irqsave(&query_lock, flags);
 140         if (has_queried)
 141                 goto out;
 142
 143         qcom_scm_convention = SMC_CONVENTION_ARM_64;
 144         // Device isn't required as there is only one argument - no device
 145         // needed to dma_map_single to secure world
 146         ret = scm_smc_call(NULL, &desc, &res, true);
 147         if (!ret && res.result[0] == 1)
 148                 goto out;
 149
 150         qcom_scm_convention = SMC_CONVENTION_ARM_32;
 151         ret = scm_smc_call(NULL, &desc, &res, true);
 152         if (!ret && res.result[0] == 1)
 153                 goto out;
 154
 155         qcom_scm_convention = SMC_CONVENTION_LEGACY;
 156 out:
 157         has_queried = true;
 158         spin_unlock_irqrestore(&query_lock, flags);
 159         pr_info("qcom_scm: convention: %s\n",
 160                 qcom_scm_convention_names[qcom_scm_convention]);
 161 }
 162
 163 static inline enum qcom_scm_convention __get_convention(void)
 164 {
 165         if (unlikely(!has_queried))
 166                 __query_convention();
 167         return qcom_scm_convention;
 168 }
 169
 170 /**
 171  * qcom_scm_call() - Invoke a syscall in the secure world
 172  * @dev:        device
 173  * @svc_id:     service identifier
 174  * @cmd_id:     command identifier
 175  * @desc:       Descriptor structure containing arguments and return values
 176  *
 177  * Sends a command to the SCM and waits for the command to finish processing.
 178  * This should *only* be called in pre-emptible context.
 179  */
 180 static int qcom_scm_call(struct device *dev, const struct qcom_scm_desc *desc,
 181                          struct qcom_scm_res *res)
 182 {
 183         might_sleep();
 184         switch (__get_convention()) {
 185         case SMC_CONVENTION_ARM_32:
 186         case SMC_CONVENTION_ARM_64:
 187                 return scm_smc_call(dev, desc, res, false);
 188         case SMC_CONVENTION_LEGACY:
 189                 return scm_legacy_call(dev, desc, res);
 190         default:
 191                 pr_err("Unknown current SCM calling convention.\n");
 192                 return -EINVAL;
 193         }
 194 }
 195
 196 /**
 197  * qcom_scm_call_atomic() - atomic variation of qcom_scm_call()
 198  * @dev:        device
 199  * @svc_id:     service identifier
 200  * @cmd_id:     command identifier
 201  * @desc:       Descriptor structure containing arguments and return values
 202  * @res:        Structure containing results from SMC/HVC call
 203  *
 204  * Sends a command to the SCM and waits for the command to finish processing.
 205  * This can be called in atomic context.
 206  */
 207 static int qcom_scm_call_atomic(struct device *dev,
 208                                 const struct qcom_scm_desc *desc,
 209                                 struct qcom_scm_res *res)
 210 {
 211         switch (__get_convention()) {
 212         case SMC_CONVENTION_ARM_32:
 213         case SMC_CONVENTION_ARM_64:
 214                 return scm_smc_call(dev, desc, res, true);
 215         case SMC_CONVENTION_LEGACY:
 216                 return scm_legacy_call_atomic(dev, desc, res);
 217         default:
 218                 pr_err("Unknown current SCM calling convention.\n");
 219                 return -EINVAL;
 220         }
 221 }
 222
 223 static int __qcom_scm_is_call_available(struct device *dev, u32 svc_id,
 224                                         u32 cmd_id)
 225 {
 226         int ret;
 227         struct qcom_scm_desc desc = {
 228                 .svc = QCOM_SCM_SVC_INFO,
 229                 .cmd = QCOM_SCM_INFO_IS_CALL_AVAIL,
 230                 .owner = ARM_SMCCC_OWNER_SIP,
 231         };
 232         struct qcom_scm_res res;
 233
 234         desc.arginfo = QCOM_SCM_ARGS(1);
 235         switch (__get_convention()) {
 236         case SMC_CONVENTION_ARM_32:
 237         case SMC_CONVENTION_ARM_64:
 238                 desc.args[0] = SCM_SMC_FNID(svc_id, cmd_id) |
 239                                 (ARM_SMCCC_OWNER_SIP << ARM_SMCCC_OWNER_SHIFT);
 240                 break;
 241         case SMC_CONVENTION_LEGACY:
 242                 desc.args[0] = SCM_LEGACY_FNID(svc_id, cmd_id);
 243                 break;
 244         default:
 245                 pr_err("Unknown SMC convention being used\n");
 246                 return -EINVAL;
 247         }
 248
 249         ret = qcom_scm_call(dev, &desc, &res);
 250
 251         return ret ? : res.result[0];
 252 }
 253
 254 /**
 255  * qcom_scm_set_warm_boot_addr() - Set the warm boot address for cpus
 256  * @entry: Entry point function for the cpus
 257  * @cpus: The cpumask of cpus that will use the entry point
 258  *
 259  * Set the Linux entry point for the SCM to transfer control to when coming
 260  * out of a power down. CPU power down may be executed on cpuidle or hotplug.
 261  */
 262 int qcom_scm_set_warm_boot_addr(void *entry, const cpumask_t *cpus)
 263 {
 264         int ret;
 265         int flags = 0;
 266         int cpu;
 267         struct qcom_scm_desc desc = {
 268                 .svc = QCOM_SCM_SVC_BOOT,
 269                 .cmd = QCOM_SCM_BOOT_SET_ADDR,
 270                 .arginfo = QCOM_SCM_ARGS(2),
 271         };
 272
 273         /*
 274          * Reassign only if we are switching from hotplug entry point
 275          * to cpuidle entry point or vice versa.
 276          */
 277         for_each_cpu(cpu, cpus) {
 278                 if (entry == qcom_scm_wb[cpu].entry)
 279                         continue;
 280                 flags |= qcom_scm_wb[cpu].flag;
 281         }
 282
 283         /* No change in entry function */
 284         if (!flags)
 285                 return 0;
 286
 287         desc.args[0] = flags;
 288         desc.args[1] = virt_to_phys(entry);
 289
 290         ret = qcom_scm_call(__scm->dev, &desc, NULL);
 291         if (!ret) {
 292                 for_each_cpu(cpu, cpus)
 293                         qcom_scm_wb[cpu].entry = entry;
 294         }
 295
 296         return ret;
 297 }
 298 EXPORT_SYMBOL(qcom_scm_set_warm_boot_addr);
 299
 300 /**
 301  * qcom_scm_set_cold_boot_addr() - Set the cold boot address for cpus
 302  * @entry: Entry point function for the cpus
 303  * @cpus: The cpumask of cpus that will use the entry point
 304  *
 305  * Set the cold boot address of the cpus. Any cpu outside the supported
 306  * range would be removed from the cpu present mask.
 307  */
 308 int qcom_scm_set_cold_boot_addr(void *entry, const cpumask_t *cpus)
 309 {
 310         int flags = 0;
 311         int cpu;
 312         int scm_cb_flags[] = {
 313                 QCOM_SCM_FLAG_COLDBOOT_CPU0,
 314                 QCOM_SCM_FLAG_COLDBOOT_CPU1,
 315                 QCOM_SCM_FLAG_COLDBOOT_CPU2,
 316                 QCOM_SCM_FLAG_COLDBOOT_CPU3,
 317         };
 318         struct qcom_scm_desc desc = {
 319                 .svc = QCOM_SCM_SVC_BOOT,
 320                 .cmd = QCOM_SCM_BOOT_SET_ADDR,
 321                 .arginfo = QCOM_SCM_ARGS(2),
 322                 .owner = ARM_SMCCC_OWNER_SIP,
 323         };
 324
 325         if (!cpus || (cpus && cpumask_empty(cpus)))
 326                 return -EINVAL;
 327
 328         for_each_cpu(cpu, cpus) {
 329                 if (cpu < ARRAY_SIZE(scm_cb_flags))
 330                         flags |= scm_cb_flags[cpu];
 331                 else
 332                         set_cpu_present(cpu, false);
 333         }
 334
 335         desc.args[0] = flags;
 336         desc.args[1] = virt_to_phys(entry);
 337
 338         return qcom_scm_call_atomic(__scm ? __scm->dev : NULL, &desc, NULL);
 339 }
 340 EXPORT_SYMBOL(qcom_scm_set_cold_boot_addr);
 341
 342 /**
 343  * qcom_scm_cpu_power_down() - Power down the cpu
 344  * @flags - Flags to flush cache
 345  *
 346  * This is an end point to power down cpu. If there was a pending interrupt,
 347  * the control would return from this function, otherwise, the cpu jumps to the
 348  * warm boot entry point set for this cpu upon reset.
 349  */
 350 void qcom_scm_cpu_power_down(u32 flags)
 351 {
 352         struct qcom_scm_desc desc = {
 353                 .svc = QCOM_SCM_SVC_BOOT,
 354                 .cmd = QCOM_SCM_BOOT_TERMINATE_PC,
 355                 .args[0] = flags & QCOM_SCM_FLUSH_FLAG_MASK,
 356                 .arginfo = QCOM_SCM_ARGS(1),
 357                 .owner = ARM_SMCCC_OWNER_SIP,
 358         };
 359
 360         qcom_scm_call_atomic(__scm ? __scm->dev : NULL, &desc, NULL);
 361 }
 362 EXPORT_SYMBOL(qcom_scm_cpu_power_down);
 363
 364 int qcom_scm_set_remote_state(u32 state, u32 id)
 365 {
 366         struct qcom_scm_desc desc = {
 367                 .svc = QCOM_SCM_SVC_BOOT,
 368                 .cmd = QCOM_SCM_BOOT_SET_REMOTE_STATE,
 369                 .arginfo = QCOM_SCM_ARGS(2),
 370                 .args[0] = state,
 371                 .args[1] = id,
 372                 .owner = ARM_SMCCC_OWNER_SIP,
 373         };
 374         struct qcom_scm_res res;
 375         int ret;
 376
 377         ret = qcom_scm_call(__scm->dev, &desc, &res);
 378
 379         return ret ? : res.result[0];
 380 }
 381 EXPORT_SYMBOL(qcom_scm_set_remote_state);
 382
 383 static int __qcom_scm_set_dload_mode(struct device *dev, bool enable)
 384 {
 385         struct qcom_scm_desc desc = {
 386                 .svc = QCOM_SCM_SVC_BOOT,
 387                 .cmd = QCOM_SCM_BOOT_SET_DLOAD_MODE,
 388                 .arginfo = QCOM_SCM_ARGS(2),
 389                 .args[0] = QCOM_SCM_BOOT_SET_DLOAD_MODE,
 390                 .owner = ARM_SMCCC_OWNER_SIP,
 391         };
 392
 393         desc.args[1] = enable ? QCOM_SCM_BOOT_SET_DLOAD_MODE : 0;
 394
 395         return qcom_scm_call(__scm->dev, &desc, NULL);
 396 }
 397
 398 static void qcom_scm_set_download_mode(bool enable)
 399 {
 400         bool avail;
 401         int ret = 0;
 402
 403         avail = __qcom_scm_is_call_available(__scm->dev,
 404                                              QCOM_SCM_SVC_BOOT,
 405                                              QCOM_SCM_BOOT_SET_DLOAD_MODE);
 406         if (avail) {
 407                 ret = __qcom_scm_set_dload_mode(__scm->dev, enable);
 408         } else if (__scm->dload_mode_addr) {
 409                 ret = qcom_scm_io_writel(__scm->dload_mode_addr,
 410                                 enable ? QCOM_SCM_BOOT_SET_DLOAD_MODE : 0);
 411         } else {
 412                 dev_err(__scm->dev,
 413                         "No available mechanism for setting download mode\n");
 414         }
 415
 416         if (ret)
 417                 dev_err(__scm->dev, "failed to set download mode: %d\n", ret);
 418 }
 419
 420 /**
 421  * qcom_scm_pas_init_image() - Initialize peripheral authentication service
 422  *                             state machine for a given peripheral, using the
 423  *                             metadata
 424  * @peripheral: peripheral id
 425  * @metadata:   pointer to memory containing ELF header, program header table
 426  *              and optional blob of data used for authenticating the metadata
 427  *              and the rest of the firmware
 428  * @size:       size of the metadata
 429  *
 430  * Returns 0 on success.
 431  */
 432 int qcom_scm_pas_init_image(u32 peripheral, const void *metadata, size_t size)
 433 {
 434         dma_addr_t mdata_phys;
 435         void *mdata_buf;
 436         int ret;
 437         struct qcom_scm_desc desc = {
 438                 .svc = QCOM_SCM_SVC_PIL,
 439                 .cmd = QCOM_SCM_PIL_PAS_INIT_IMAGE,
 440                 .arginfo = QCOM_SCM_ARGS(2, QCOM_SCM_VAL, QCOM_SCM_RW),
 441                 .args[0] = peripheral,
 442                 .owner = ARM_SMCCC_OWNER_SIP,
 443         };
 444         struct qcom_scm_res res;
 445
 446         /*
 447          * During the scm call memory protection will be enabled for the meta
 448          * data blob, so make sure it's physically contiguous, 4K aligned and
 449          * non-cachable to avoid XPU violations.
 450          */
 451         mdata_buf = dma_alloc_coherent(__scm->dev, size, &mdata_phys,
 452                                        GFP_KERNEL);
 453         if (!mdata_buf) {
 454                 dev_err(__scm->dev, "Allocation of metadata buffer failed.\n");
 455                 return -ENOMEM;
 456         }
 457         memcpy(mdata_buf, metadata, size);
 458
 459         ret = qcom_scm_clk_enable();
 460         if (ret)
 461                 goto free_metadata;
 462
 463         desc.args[1] = mdata_phys;
 464
 465         ret = qcom_scm_call(__scm->dev, &desc, &res);
 466
 467         qcom_scm_clk_disable();
 468
 469 free_metadata:
 470         dma_free_coherent(__scm->dev, size, mdata_buf, mdata_phys);
 471
 472         return ret ? : res.result[0];
 473 }
 474 EXPORT_SYMBOL(qcom_scm_pas_init_image);
 475
 476 /**
 477  * qcom_scm_pas_mem_setup() - Prepare the memory related to a given peripheral
 478  *                            for firmware loading
 479  * @peripheral: peripheral id
 480  * @addr:       start address of memory area to prepare
 481  * @size:       size of the memory area to prepare
 482  *
 483  * Returns 0 on success.
 484  */
 485 int qcom_scm_pas_mem_setup(u32 peripheral, phys_addr_t addr, phys_addr_t size)
 486 {
 487         int ret;
 488         struct qcom_scm_desc desc = {
 489                 .svc = QCOM_SCM_SVC_PIL,
 490                 .cmd = QCOM_SCM_PIL_PAS_MEM_SETUP,
 491                 .arginfo = QCOM_SCM_ARGS(3),
 492                 .args[0] = peripheral,
 493                 .args[1] = addr,
 494                 .args[2] = size,
 495                 .owner = ARM_SMCCC_OWNER_SIP,
 496         };
 497         struct qcom_scm_res res;
 498
 499         ret = qcom_scm_clk_enable();
 500         if (ret)
 501                 return ret;
 502
 503         ret = qcom_scm_call(__scm->dev, &desc, &res);
 504         qcom_scm_clk_disable();
 505
 506         return ret ? : res.result[0];
 507 }
 508 EXPORT_SYMBOL(qcom_scm_pas_mem_setup);
 509
 510 /**
 511  * qcom_scm_pas_auth_and_reset() - Authenticate the given peripheral firmware
 512  *                                 and reset the remote processor
 513  * @peripheral: peripheral id
 514  *
 515  * Return 0 on success.
 516  */
 517 int qcom_scm_pas_auth_and_reset(u32 peripheral)
 518 {
 519         int ret;
 520         struct qcom_scm_desc desc = {
 521                 .svc = QCOM_SCM_SVC_PIL,
 522                 .cmd = QCOM_SCM_PIL_PAS_AUTH_AND_RESET,
 523                 .arginfo = QCOM_SCM_ARGS(1),
 524                 .args[0] = peripheral,
 525                 .owner = ARM_SMCCC_OWNER_SIP,
 526         };
 527         struct qcom_scm_res res;
 528
 529         ret = qcom_scm_clk_enable();
 530         if (ret)
 531                 return ret;
 532
 533         ret = qcom_scm_call(__scm->dev, &desc, &res);
 534         qcom_scm_clk_disable();
 535
 536         return ret ? : res.result[0];
 537 }
 538 EXPORT_SYMBOL(qcom_scm_pas_auth_and_reset);
 539
 540 /**
 541  * qcom_scm_pas_shutdown() - Shut down the remote processor
 542  * @peripheral: peripheral id
 543  *
 544  * Returns 0 on success.
 545  */
 546 int qcom_scm_pas_shutdown(u32 peripheral)
 547 {
 548         int ret;
 549         struct qcom_scm_desc desc = {
 550                 .svc = QCOM_SCM_SVC_PIL,
 551                 .cmd = QCOM_SCM_PIL_PAS_SHUTDOWN,
 552                 .arginfo = QCOM_SCM_ARGS(1),
 553                 .args[0] = peripheral,
 554                 .owner = ARM_SMCCC_OWNER_SIP,
 555         };
 556         struct qcom_scm_res res;
 557
 558         ret = qcom_scm_clk_enable();
 559         if (ret)
 560                 return ret;
 561
 562         ret = qcom_scm_call(__scm->dev, &desc, &res);
 563
 564         qcom_scm_clk_disable();
 565
 566         return ret ? : res.result[0];
 567 }
 568 EXPORT_SYMBOL(qcom_scm_pas_shutdown);
 569
 570 /**
 571  * qcom_scm_pas_supported() - Check if the peripheral authentication service is
 572  *                            available for the given peripherial
 573  * @peripheral: peripheral id
 574  *
 575  * Returns true if PAS is supported for this peripheral, otherwise false.
 576  */
 577 bool qcom_scm_pas_supported(u32 peripheral)
 578 {
 579         int ret;
 580         struct qcom_scm_desc desc = {
 581                 .svc = QCOM_SCM_SVC_PIL,
 582                 .cmd = QCOM_SCM_PIL_PAS_IS_SUPPORTED,
 583                 .arginfo = QCOM_SCM_ARGS(1),
 584                 .args[0] = peripheral,
 585                 .owner = ARM_SMCCC_OWNER_SIP,
 586         };
 587         struct qcom_scm_res res;
 588
 589         ret = __qcom_scm_is_call_available(__scm->dev, QCOM_SCM_SVC_PIL,
 590                                            QCOM_SCM_PIL_PAS_IS_SUPPORTED);
 591         if (ret <= 0)
 592                 return false;
 593
 594         ret = qcom_scm_call(__scm->dev, &desc, &res);
 595
 596         return ret ? false : !!res.result[0];
 597 }
 598 EXPORT_SYMBOL(qcom_scm_pas_supported);
 599
 600 static int __qcom_scm_pas_mss_reset(struct device *dev, bool reset)
 601 {
 602         struct qcom_scm_desc desc = {
 603                 .svc = QCOM_SCM_SVC_PIL,
 604                 .cmd = QCOM_SCM_PIL_PAS_MSS_RESET,
 605                 .arginfo = QCOM_SCM_ARGS(2),
 606                 .args[0] = reset,
 607                 .args[1] = 0,
 608                 .owner = ARM_SMCCC_OWNER_SIP,
 609         };
 610         struct qcom_scm_res res;
 611         int ret;
 612
 613         ret = qcom_scm_call(__scm->dev, &desc, &res);
 614
 615         return ret ? : res.result[0];
 616 }
 617
 618 static int qcom_scm_pas_reset_assert(struct reset_controller_dev *rcdev,
 619                                      unsigned long idx)
 620 {
 621         if (idx != 0)
 622                 return -EINVAL;
 623
 624         return __qcom_scm_pas_mss_reset(__scm->dev, 1);
 625 }
 626
 627 static int qcom_scm_pas_reset_deassert(struct reset_controller_dev *rcdev,
 628                                        unsigned long idx)
 629 {
 630         if (idx != 0)
 631                 return -EINVAL;
 632
 633         return __qcom_scm_pas_mss_reset(__scm->dev, 0);
 634 }
 635
 636 static const struct reset_control_ops qcom_scm_pas_reset_ops = {
 637         .assert = qcom_scm_pas_reset_assert,
 638         .deassert = qcom_scm_pas_reset_deassert,
 639 };
 640
 641 int qcom_scm_io_readl(phys_addr_t addr, unsigned int *val)
 642 {
 643         struct qcom_scm_desc desc = {
 644                 .svc = QCOM_SCM_SVC_IO,
 645                 .cmd = QCOM_SCM_IO_READ,
 646                 .arginfo = QCOM_SCM_ARGS(1),
 647                 .args[0] = addr,
 648                 .owner = ARM_SMCCC_OWNER_SIP,
 649         };
 650         struct qcom_scm_res res;
 651         int ret;
 652
 653
 654         ret = qcom_scm_call(__scm->dev, &desc, &res);
 655         if (ret >= 0)
 656                 *val = res.result[0];
 657
 658         return ret < 0 ? ret : 0;
 659 }
 660 EXPORT_SYMBOL(qcom_scm_io_readl);
 661
 662 int qcom_scm_io_writel(phys_addr_t addr, unsigned int val)
 663 {
 664         struct qcom_scm_desc desc = {
 665                 .svc = QCOM_SCM_SVC_IO,
 666                 .cmd = QCOM_SCM_IO_WRITE,
 667                 .arginfo = QCOM_SCM_ARGS(2),
 668                 .args[0] = addr,
 669                 .args[1] = val,
 670                 .owner = ARM_SMCCC_OWNER_SIP,
 671         };
 672
 673
 674         return qcom_scm_call(__scm->dev, &desc, NULL);
 675 }
 676 EXPORT_SYMBOL(qcom_scm_io_writel);
 677
 678 /**
 679  * qcom_scm_restore_sec_cfg_available() - Check if secure environment
 680  * supports restore security config interface.
 681  *
 682  * Return true if restore-cfg interface is supported, false if not.
 683  */
 684 bool qcom_scm_restore_sec_cfg_available(void)
 685 {
 686         return __qcom_scm_is_call_available(__scm->dev, QCOM_SCM_SVC_MP,
 687                                             QCOM_SCM_MP_RESTORE_SEC_CFG);
 688 }
 689 EXPORT_SYMBOL(qcom_scm_restore_sec_cfg_available);
 690
 691 int qcom_scm_restore_sec_cfg(u32 device_id, u32 spare)
 692 {
 693         struct qcom_scm_desc desc = {
 694                 .svc = QCOM_SCM_SVC_MP,
 695                 .cmd = QCOM_SCM_MP_RESTORE_SEC_CFG,
 696                 .arginfo = QCOM_SCM_ARGS(2),
 697                 .args[0] = device_id,
 698                 .args[1] = spare,
 699                 .owner = ARM_SMCCC_OWNER_SIP,
 700         };
 701         struct qcom_scm_res res;
 702         int ret;
 703
 704         ret = qcom_scm_call(__scm->dev, &desc, &res);
 705
 706         return ret ? : res.result[0];
 707 }
 708 EXPORT_SYMBOL(qcom_scm_restore_sec_cfg);
 709
 710 int qcom_scm_iommu_secure_ptbl_size(u32 spare, size_t *size)
 711 {
 712         struct qcom_scm_desc desc = {
 713                 .svc = QCOM_SCM_SVC_MP,
 714                 .cmd = QCOM_SCM_MP_IOMMU_SECURE_PTBL_SIZE,
 715                 .arginfo = QCOM_SCM_ARGS(1),
 716                 .args[0] = spare,
 717                 .owner = ARM_SMCCC_OWNER_SIP,
 718         };
 719         struct qcom_scm_res res;
 720         int ret;
 721
 722         ret = qcom_scm_call(__scm->dev, &desc, &res);
 723
 724         if (size)
 725                 *size = res.result[0];
 726
 727         return ret ? : res.result[1];
 728 }
 729 EXPORT_SYMBOL(qcom_scm_iommu_secure_ptbl_size);
 730
 731 int qcom_scm_iommu_secure_ptbl_init(u64 addr, u32 size, u32 spare)
 732 {
 733         struct qcom_scm_desc desc = {
 734                 .svc = QCOM_SCM_SVC_MP,
 735                 .cmd = QCOM_SCM_MP_IOMMU_SECURE_PTBL_INIT,
 736                 .arginfo = QCOM_SCM_ARGS(3, QCOM_SCM_RW, QCOM_SCM_VAL,
 737                                          QCOM_SCM_VAL),
 738                 .args[0] = addr,
 739                 .args[1] = size,
 740                 .args[2] = spare,
 741                 .owner = ARM_SMCCC_OWNER_SIP,
 742         };
 743         int ret;
 744
 745         desc.args[0] = addr;
 746         desc.args[1] = size;
 747         desc.args[2] = spare;
 748         desc.arginfo = QCOM_SCM_ARGS(3, QCOM_SCM_RW, QCOM_SCM_VAL,
 749                                      QCOM_SCM_VAL);
 750
 751         ret = qcom_scm_call(__scm->dev, &desc, NULL);
 752
 753         /* the pg table has been initialized already, ignore the error */
 754         if (ret == -EPERM)
 755                 ret = 0;
 756
 757         return ret;
 758 }
 759 EXPORT_SYMBOL(qcom_scm_iommu_secure_ptbl_init);
 760
 761 static int __qcom_scm_assign_mem(struct device *dev, phys_addr_t mem_region,
 762                                  size_t mem_sz, phys_addr_t src, size_t src_sz,
 763                                  phys_addr_t dest, size_t dest_sz)
 764 {
 765         int ret;
 766         struct qcom_scm_desc desc = {
 767                 .svc = QCOM_SCM_SVC_MP,
 768                 .cmd = QCOM_SCM_MP_ASSIGN,
 769                 .arginfo = QCOM_SCM_ARGS(7, QCOM_SCM_RO, QCOM_SCM_VAL,
 770                                          QCOM_SCM_RO, QCOM_SCM_VAL, QCOM_SCM_RO,
 771                                          QCOM_SCM_VAL, QCOM_SCM_VAL),
 772                 .args[0] = mem_region,
 773                 .args[1] = mem_sz,
 774                 .args[2] = src,
 775                 .args[3] = src_sz,
 776                 .args[4] = dest,
 777                 .args[5] = dest_sz,
 778                 .args[6] = 0,
 779                 .owner = ARM_SMCCC_OWNER_SIP,
 780         };
 781         struct qcom_scm_res res;
 782
 783         ret = qcom_scm_call(dev, &desc, &res);
 784
 785         return ret ? : res.result[0];
 786 }
 787
 788 /**
 789  * qcom_scm_assign_mem() - Make a secure call to reassign memory ownership
 790  * @mem_addr: mem region whose ownership need to be reassigned
 791  * @mem_sz:   size of the region.
 792  * @srcvm:    vmid for current set of owners, each set bit in
 793  *            flag indicate a unique owner
 794  * @newvm:    array having new owners and corresponding permission
 795  *            flags
 796  * @dest_cnt: number of owners in next set.
 797  *
 798  * Return negative errno on failure or 0 on success with @srcvm updated.
 799  */
 800 int qcom_scm_assign_mem(phys_addr_t mem_addr, size_t mem_sz,
 801                         unsigned int *srcvm,
 802                         const struct qcom_scm_vmperm *newvm,
 803                         unsigned int dest_cnt)
 804 {
 805         struct qcom_scm_current_perm_info *destvm;
 806         struct qcom_scm_mem_map_info *mem_to_map;
 807         phys_addr_t mem_to_map_phys;
 808         phys_addr_t dest_phys;
 809         phys_addr_t ptr_phys;
 810         dma_addr_t ptr_dma;
 811         size_t mem_to_map_sz;
 812         size_t dest_sz;
 813         size_t src_sz;
 814         size_t ptr_sz;
 815         int next_vm;
 816         __le32 *src;
 817         void *ptr;
 818         int ret, i, b;
 819         unsigned long srcvm_bits = *srcvm;
 820
 821         src_sz = hweight_long(srcvm_bits) * sizeof(*src);
 822         mem_to_map_sz = sizeof(*mem_to_map);
 823         dest_sz = dest_cnt * sizeof(*destvm);
 824         ptr_sz = ALIGN(src_sz, SZ_64) + ALIGN(mem_to_map_sz, SZ_64) +
 825                         ALIGN(dest_sz, SZ_64);
 826
 827         ptr = dma_alloc_coherent(__scm->dev, ptr_sz, &ptr_dma, GFP_KERNEL);
 828         if (!ptr)
 829                 return -ENOMEM;
 830         ptr_phys = dma_to_phys(__scm->dev, ptr_dma);
 831
 832         /* Fill source vmid detail */
 833         src = ptr;
 834         i = 0;
 835         for_each_set_bit(b, &srcvm_bits, BITS_PER_LONG)
 836                 src[i++] = cpu_to_le32(b);
 837
 838         /* Fill details of mem buff to map */
 839         mem_to_map = ptr + ALIGN(src_sz, SZ_64);
 840         mem_to_map_phys = ptr_phys + ALIGN(src_sz, SZ_64);
 841         mem_to_map->mem_addr = cpu_to_le64(mem_addr);
 842         mem_to_map->mem_size = cpu_to_le64(mem_sz);
 843
 844         next_vm = 0;
 845         /* Fill details of next vmid detail */
 846         destvm = ptr + ALIGN(mem_to_map_sz, SZ_64) + ALIGN(src_sz, SZ_64);
 847         dest_phys = ptr_phys + ALIGN(mem_to_map_sz, SZ_64) + ALIGN(src_sz, SZ_64);
 848         for (i = 0; i < dest_cnt; i++, destvm++, newvm++) {
 849                 destvm->vmid = cpu_to_le32(newvm->vmid);
 850                 destvm->perm = cpu_to_le32(newvm->perm);
 851                 destvm->ctx = 0;
 852                 destvm->ctx_size = 0;
 853                 next_vm |= BIT(newvm->vmid);
 854         }
 855
 856         ret = __qcom_scm_assign_mem(__scm->dev, mem_to_map_phys, mem_to_map_sz,
 857                                     ptr_phys, src_sz, dest_phys, dest_sz);
 858         dma_free_coherent(__scm->dev, ptr_sz, ptr, ptr_dma);
 859         if (ret) {
 860                 dev_err(__scm->dev,
 861                         "Assign memory protection call failed %d\n", ret);
 862                 return -EINVAL;
 863         }
 864
 865         *srcvm = next_vm;
 866         return 0;
 867 }
 868 EXPORT_SYMBOL(qcom_scm_assign_mem);
 869
 870 /**
 871  * qcom_scm_ocmem_lock_available() - is OCMEM lock/unlock interface available
 872  */
 873 bool qcom_scm_ocmem_lock_available(void)
 874 {
 875         return __qcom_scm_is_call_available(__scm->dev, QCOM_SCM_SVC_OCMEM,
 876                                             QCOM_SCM_OCMEM_LOCK_CMD);
 877 }
 878 EXPORT_SYMBOL(qcom_scm_ocmem_lock_available);
 879
 880 /**
 881  * qcom_scm_ocmem_lock() - call OCMEM lock interface to assign an OCMEM
 882  * region to the specified initiator
 883  *
 884  * @id:     tz initiator id
 885  * @offset: OCMEM offset
 886  * @size:   OCMEM size
 887  * @mode:   access mode (WIDE/NARROW)
 888  */
 889 int qcom_scm_ocmem_lock(enum qcom_scm_ocmem_client id, u32 offset, u32 size,
 890                         u32 mode)
 891 {
 892         struct qcom_scm_desc desc = {
 893                 .svc = QCOM_SCM_SVC_OCMEM,
 894                 .cmd = QCOM_SCM_OCMEM_LOCK_CMD,
 895                 .args[0] = id,
 896                 .args[1] = offset,
 897                 .args[2] = size,
 898                 .args[3] = mode,
 899                 .arginfo = QCOM_SCM_ARGS(4),
 900         };
 901
 902         return qcom_scm_call(__scm->dev, &desc, NULL);
 903 }
 904 EXPORT_SYMBOL(qcom_scm_ocmem_lock);
 905
 906 /**
 907  * qcom_scm_ocmem_unlock() - call OCMEM unlock interface to release an OCMEM
 908  * region from the specified initiator
 909  *
 910  * @id:     tz initiator id
 911  * @offset: OCMEM offset
 912  * @size:   OCMEM size
 913  */
 914 int qcom_scm_ocmem_unlock(enum qcom_scm_ocmem_client id, u32 offset, u32 size)
 915 {
 916         struct qcom_scm_desc desc = {
 917                 .svc = QCOM_SCM_SVC_OCMEM,
 918                 .cmd = QCOM_SCM_OCMEM_UNLOCK_CMD,
 919                 .args[0] = id,
 920                 .args[1] = offset,
 921                 .args[2] = size,
 922                 .arginfo = QCOM_SCM_ARGS(3),
 923         };
 924
 925         return qcom_scm_call(__scm->dev, &desc, NULL);
 926 }
 927 EXPORT_SYMBOL(qcom_scm_ocmem_unlock);
 928
 929 /**
 930  * qcom_scm_hdcp_available() - Check if secure environment supports HDCP.
 931  *
 932  * Return true if HDCP is supported, false if not.
 933  */
 934 bool qcom_scm_hdcp_available(void)
 935 {
 936         int ret = qcom_scm_clk_enable();
 937
 938         if (ret)
 939                 return ret;
 940
 941         ret = __qcom_scm_is_call_available(__scm->dev, QCOM_SCM_SVC_HDCP,
 942                                                 QCOM_SCM_HDCP_INVOKE);
 943
 944         qcom_scm_clk_disable();
 945
 946         return ret > 0 ? true : false;
 947 }
 948 EXPORT_SYMBOL(qcom_scm_hdcp_available);
 949
 950 /**
 951  * qcom_scm_hdcp_req() - Send HDCP request.
 952  * @req: HDCP request array
 953  * @req_cnt: HDCP request array count
 954  * @resp: response buffer passed to SCM
 955  *
 956  * Write HDCP register(s) through SCM.
 957  */
 958 int qcom_scm_hdcp_req(struct qcom_scm_hdcp_req *req, u32 req_cnt, u32 *resp)
 959 {
 960         int ret;
 961         struct qcom_scm_desc desc = {
 962                 .svc = QCOM_SCM_SVC_HDCP,
 963                 .cmd = QCOM_SCM_HDCP_INVOKE,
 964                 .arginfo = QCOM_SCM_ARGS(10),
 965                 .args = {
 966                         req[0].addr,
 967                         req[0].val,
 968                         req[1].addr,
 969                         req[1].val,
 970                         req[2].addr,
 971                         req[2].val,
 972                         req[3].addr,
 973                         req[3].val,
 974                         req[4].addr,
 975                         req[4].val
 976                 },
 977                 .owner = ARM_SMCCC_OWNER_SIP,
 978         };
 979         struct qcom_scm_res res;
 980
 981         if (req_cnt > QCOM_SCM_HDCP_MAX_REQ_CNT)
 982                 return -ERANGE;
 983
 984         ret = qcom_scm_clk_enable();
 985         if (ret)
 986                 return ret;
 987
 988         ret = qcom_scm_call(__scm->dev, &desc, &res);
 989         *resp = res.result[0];
 990
 991         qcom_scm_clk_disable();
 992
 993         return ret;
 994 }
 995 EXPORT_SYMBOL(qcom_scm_hdcp_req);
 996
 997 int qcom_scm_qsmmu500_wait_safe_toggle(bool en)
 998 {
 999         struct qcom_scm_desc desc = {
1000                 .svc = QCOM_SCM_SVC_SMMU_PROGRAM,
1001                 .cmd = QCOM_SCM_SMMU_CONFIG_ERRATA1,
1002                 .arginfo = QCOM_SCM_ARGS(2),
1003                 .args[0] = QCOM_SCM_SMMU_CONFIG_ERRATA1_CLIENT_ALL,
1004                 .args[1] = en,
1005                 .owner = ARM_SMCCC_OWNER_SIP,
1006         };
1007
1008
1009         return qcom_scm_call_atomic(__scm->dev, &desc, NULL);
1010 }
1011 EXPORT_SYMBOL(qcom_scm_qsmmu500_wait_safe_toggle);
1012
1013 static int qcom_scm_find_dload_address(struct device *dev, u64 *addr)
1014 {
1015         struct device_node *tcsr;
1016         struct device_node *np = dev->of_node;
1017         struct resource res;
1018         u32 offset;
1019         int ret;
1020
1021         tcsr = of_parse_phandle(np, "qcom,dload-mode", 0);
1022         if (!tcsr)
1023                 return 0;
1024
1025         ret = of_address_to_resource(tcsr, 0, &res);
1026         of_node_put(tcsr);
1027         if (ret)
1028                 return ret;
1029
1030         ret = of_property_read_u32_index(np, "qcom,dload-mode", 1, &offset);
1031         if (ret < 0)
1032                 return ret;
1033
1034         *addr = res.start + offset;
1035
1036         return 0;
1037 }
1038
1039 /**
1040  * qcom_scm_is_available() - Checks if SCM is available
1041  */
1042 bool qcom_scm_is_available(void)
1043 {
1044         return !!__scm;
1045 }
1046 EXPORT_SYMBOL(qcom_scm_is_available);
1047
1048 static int qcom_scm_probe(struct platform_device *pdev)
1049 {
1050         struct qcom_scm *scm;
1051         unsigned long clks;
1052         int ret;
1053
1054         scm = devm_kzalloc(&pdev->dev, sizeof(*scm), GFP_KERNEL);
1055         if (!scm)
1056                 return -ENOMEM;
1057
1058         ret = qcom_scm_find_dload_address(&pdev->dev, &scm->dload_mode_addr);
1059         if (ret < 0)
1060                 return ret;
1061
1062         clks = (unsigned long)of_device_get_match_data(&pdev->dev);
1063
1064         scm->core_clk = devm_clk_get(&pdev->dev, "core");
1065         if (IS_ERR(scm->core_clk)) {
1066                 if (PTR_ERR(scm->core_clk) == -EPROBE_DEFER)
1067                         return PTR_ERR(scm->core_clk);
1068
1069                 if (clks & SCM_HAS_CORE_CLK) {
1070                         dev_err(&pdev->dev, "failed to acquire core clk\n");
1071                         return PTR_ERR(scm->core_clk);
1072                 }
1073
1074                 scm->core_clk = NULL;
1075         }
1076
1077         scm->iface_clk = devm_clk_get(&pdev->dev, "iface");
1078         if (IS_ERR(scm->iface_clk)) {
1079                 if (PTR_ERR(scm->iface_clk) == -EPROBE_DEFER)
1080                         return PTR_ERR(scm->iface_clk);
1081
1082                 if (clks & SCM_HAS_IFACE_CLK) {
1083                         dev_err(&pdev->dev, "failed to acquire iface clk\n");
1084                         return PTR_ERR(scm->iface_clk);
1085                 }
1086
1087                 scm->iface_clk = NULL;
1088         }
1089
1090         scm->bus_clk = devm_clk_get(&pdev->dev, "bus");
1091         if (IS_ERR(scm->bus_clk)) {
1092                 if (PTR_ERR(scm->bus_clk) == -EPROBE_DEFER)
1093                         return PTR_ERR(scm->bus_clk);
1094
1095                 if (clks & SCM_HAS_BUS_CLK) {
1096                         dev_err(&pdev->dev, "failed to acquire bus clk\n");
1097                         return PTR_ERR(scm->bus_clk);
1098                 }
1099
1100                 scm->bus_clk = NULL;
1101         }
1102
1103         scm->reset.ops = &qcom_scm_pas_reset_ops;
1104         scm->reset.nr_resets = 1;
1105         scm->reset.of_node = pdev->dev.of_node;
1106         ret = devm_reset_controller_register(&pdev->dev, &scm->reset);
1107         if (ret)
1108                 return ret;
1109
1110         /* vote for max clk rate for highest performance */
1111         ret = clk_set_rate(scm->core_clk, INT_MAX);
1112         if (ret)
1113                 return ret;
1114
1115         __scm = scm;
1116         __scm->dev = &pdev->dev;
1117
1118         __query_convention();
1119
1120         /*
1121          * If requested enable "download mode", from this point on warmboot
1122          * will cause the the boot stages to enter download mode, unless
1123          * disabled below by a clean shutdown/reboot.
1124          */
1125         if (download_mode)
1126                 qcom_scm_set_download_mode(true);
1127
1128         return 0;
1129 }
1130
1131 static void qcom_scm_shutdown(struct platform_device *pdev)
1132 {
1133         /* Clean shutdown, disable download mode to allow normal restart */
1134         if (download_mode)
1135                 qcom_scm_set_download_mode(false);
1136 }
1137
1138 static const struct of_device_id qcom_scm_dt_match[] = {
1139         { .compatible = "qcom,scm-apq8064",
1140           /* FIXME: This should have .data = (void *) SCM_HAS_CORE_CLK */
1141         },
1142         { .compatible = "qcom,scm-apq8084", .data = (void *)(SCM_HAS_CORE_CLK |
1143                                                              SCM_HAS_IFACE_CLK |
1144                                                              SCM_HAS_BUS_CLK)
1145         },
1146         { .compatible = "qcom,scm-ipq4019" },
1147         { .compatible = "qcom,scm-msm8660", .data = (void *) SCM_HAS_CORE_CLK },
1148         { .compatible = "qcom,scm-msm8960", .data = (void *) SCM_HAS_CORE_CLK },
1149         { .compatible = "qcom,scm-msm8916", .data = (void *)(SCM_HAS_CORE_CLK |
1150                                                              SCM_HAS_IFACE_CLK |
1151                                                              SCM_HAS_BUS_CLK)
1152         },
1153         { .compatible = "qcom,scm-msm8974", .data = (void *)(SCM_HAS_CORE_CLK |
1154                                                              SCM_HAS_IFACE_CLK |
1155                                                              SCM_HAS_BUS_CLK)
1156         },
1157         { .compatible = "qcom,scm-msm8996" },
1158         { .compatible = "qcom,scm" },
1159         {}
1160 };
1161
1162 static struct platform_driver qcom_scm_driver = {
1163         .driver = {
1164                 .name   = "qcom_scm",
1165                 .of_match_table = qcom_scm_dt_match,
1166         },
1167         .probe = qcom_scm_probe,
1168         .shutdown = qcom_scm_shutdown,
1169 };
1170
1171 static int __init qcom_scm_init(void)
1172 {
1173         return platform_driver_register(&qcom_scm_driver);
1174 }
1175 subsys_initcall(qcom_scm_init);