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-mapping.h>
  10 #include <linux/module.h>
  11 #include <linux/types.h>
  12 #include <linux/qcom_scm.h>
  13 #include <linux/of.h>
  14 #include <linux/of_address.h>
  15 #include <linux/of_platform.h>
  16 #include <linux/clk.h>
  17 #include <linux/reset-controller.h>
  18 #include <linux/arm-smccc.h>
  19
  20 #include "qcom_scm.h"
  21
  22 static bool download_mode = IS_ENABLED(CONFIG_QCOM_SCM_DOWNLOAD_MODE_DEFAULT);
  23 module_param(download_mode, bool, 0);
  24
  25 #define SCM_HAS_CORE_CLK        BIT(0)
  26 #define SCM_HAS_IFACE_CLK       BIT(1)
  27 #define SCM_HAS_BUS_CLK         BIT(2)
  28
  29 struct qcom_scm {
  30         struct device *dev;
  31         struct clk *core_clk;
  32         struct clk *iface_clk;
  33         struct clk *bus_clk;
  34         struct reset_controller_dev reset;
  35
  36         u64 dload_mode_addr;
  37 };
  38
  39 struct qcom_scm_current_perm_info {
  40         __le32 vmid;
  41         __le32 perm;
  42         __le64 ctx;
  43         __le32 ctx_size;
  44         __le32 unused;
  45 };
  46
  47 struct qcom_scm_mem_map_info {
  48         __le64 mem_addr;
  49         __le64 mem_size;
  50 };
  51
  52 #define QCOM_SCM_FLAG_COLDBOOT_CPU0     0x00
  53 #define QCOM_SCM_FLAG_COLDBOOT_CPU1     0x01
  54 #define QCOM_SCM_FLAG_COLDBOOT_CPU2     0x08
  55 #define QCOM_SCM_FLAG_COLDBOOT_CPU3     0x20
  56
  57 #define QCOM_SCM_FLAG_WARMBOOT_CPU0     0x04
  58 #define QCOM_SCM_FLAG_WARMBOOT_CPU1     0x02
  59 #define QCOM_SCM_FLAG_WARMBOOT_CPU2     0x10
  60 #define QCOM_SCM_FLAG_WARMBOOT_CPU3     0x40
  61
  62 struct qcom_scm_wb_entry {
  63         int flag;
  64         void *entry;
  65 };
  66
  67 static struct qcom_scm_wb_entry qcom_scm_wb[] = {
  68         { .flag = QCOM_SCM_FLAG_WARMBOOT_CPU0 },
  69         { .flag = QCOM_SCM_FLAG_WARMBOOT_CPU1 },
  70         { .flag = QCOM_SCM_FLAG_WARMBOOT_CPU2 },
  71         { .flag = QCOM_SCM_FLAG_WARMBOOT_CPU3 },
  72 };
  73
  74 static const char *qcom_scm_convention_names[] = {
  75         [SMC_CONVENTION_UNKNOWN] = "unknown",
  76         [SMC_CONVENTION_ARM_32] = "smc arm 32",
  77         [SMC_CONVENTION_ARM_64] = "smc arm 64",
  78         [SMC_CONVENTION_LEGACY] = "smc legacy",
  79 };
  80
  81 static struct qcom_scm *__scm;
  82
  83 static int qcom_scm_clk_enable(void)
  84 {
  85         int ret;
  86
  87         ret = clk_prepare_enable(__scm->core_clk);
  88         if (ret)
  89                 goto bail;
  90
  91         ret = clk_prepare_enable(__scm->iface_clk);
  92         if (ret)
  93                 goto disable_core;
  94
  95         ret = clk_prepare_enable(__scm->bus_clk);
  96         if (ret)
  97                 goto disable_iface;
  98
  99         return 0;
 100
 101 disable_iface:
 102         clk_disable_unprepare(__scm->iface_clk);
 103 disable_core:
 104         clk_disable_unprepare(__scm->core_clk);
 105 bail:
 106         return ret;
 107 }
 108
 109 static void qcom_scm_clk_disable(void)
 110 {
 111         clk_disable_unprepare(__scm->core_clk);
 112         clk_disable_unprepare(__scm->iface_clk);
 113         clk_disable_unprepare(__scm->bus_clk);
 114 }
 115
 116 enum qcom_scm_convention qcom_scm_convention = SMC_CONVENTION_UNKNOWN;
 117 static DEFINE_SPINLOCK(scm_query_lock);
 118
 119 static enum qcom_scm_convention __get_convention(void)
 120 {
 121         unsigned long flags;
 122         struct qcom_scm_desc desc = {
 123                 .svc = QCOM_SCM_SVC_INFO,
 124                 .cmd = QCOM_SCM_INFO_IS_CALL_AVAIL,
 125                 .args[0] = SCM_SMC_FNID(QCOM_SCM_SVC_INFO,
 126                                            QCOM_SCM_INFO_IS_CALL_AVAIL) |
 127                            (ARM_SMCCC_OWNER_SIP << ARM_SMCCC_OWNER_SHIFT),
 128                 .arginfo = QCOM_SCM_ARGS(1),
 129                 .owner = ARM_SMCCC_OWNER_SIP,
 130         };
 131         struct qcom_scm_res res;
 132         enum qcom_scm_convention probed_convention;
 133         int ret;
 134         bool forced = false;
 135
 136         if (likely(qcom_scm_convention != SMC_CONVENTION_UNKNOWN))
 137                 return qcom_scm_convention;
 138
 139         /*
 140          * Device isn't required as there is only one argument - no device
 141          * needed to dma_map_single to secure world
 142          */
 143         probed_convention = SMC_CONVENTION_ARM_64;
 144         ret = __scm_smc_call(NULL, &desc, probed_convention, &res, true);
 145         if (!ret && res.result[0] == 1)
 146                 goto found;
 147
 148         /*
 149          * Some SC7180 firmwares didn't implement the
 150          * QCOM_SCM_INFO_IS_CALL_AVAIL call, so we fallback to forcing ARM_64
 151          * calling conventions on these firmwares. Luckily we don't make any
 152          * early calls into the firmware on these SoCs so the device pointer
 153          * will be valid here to check if the compatible matches.
 154          */
 155         if (of_device_is_compatible(__scm ? __scm->dev->of_node : NULL, "qcom,scm-sc7180")) {
 156                 forced = true;
 157                 goto found;
 158         }
 159
 160         probed_convention = SMC_CONVENTION_ARM_32;
 161         ret = __scm_smc_call(NULL, &desc, probed_convention, &res, true);
 162         if (!ret && res.result[0] == 1)
 163                 goto found;
 164
 165         probed_convention = SMC_CONVENTION_LEGACY;
 166 found:
 167         spin_lock_irqsave(&scm_query_lock, flags);
 168         if (probed_convention != qcom_scm_convention) {
 169                 qcom_scm_convention = probed_convention;
 170                 pr_info("qcom_scm: convention: %s%s\n",
 171                         qcom_scm_convention_names[qcom_scm_convention],
 172                         forced ? " (forced)" : "");
 173         }
 174         spin_unlock_irqrestore(&scm_query_lock, flags);
 175
 176         return qcom_scm_convention;
 177 }
 178
 179 /**
 180  * qcom_scm_call() - Invoke a syscall in the secure world
 181  * @dev:        device
 182  * @svc_id:     service identifier
 183  * @cmd_id:     command identifier
 184  * @desc:       Descriptor structure containing arguments and return values
 185  *
 186  * Sends a command to the SCM and waits for the command to finish processing.
 187  * This should *only* be called in pre-emptible context.
 188  */
 189 static int qcom_scm_call(struct device *dev, const struct qcom_scm_desc *desc,
 190                          struct qcom_scm_res *res)
 191 {
 192         might_sleep();
 193         switch (__get_convention()) {
 194         case SMC_CONVENTION_ARM_32:
 195         case SMC_CONVENTION_ARM_64:
 196                 return scm_smc_call(dev, desc, res, false);
 197         case SMC_CONVENTION_LEGACY:
 198                 return scm_legacy_call(dev, desc, res);
 199         default:
 200                 pr_err("Unknown current SCM calling convention.\n");
 201                 return -EINVAL;
 202         }
 203 }
 204
 205 /**
 206  * qcom_scm_call_atomic() - atomic variation of qcom_scm_call()
 207  * @dev:        device
 208  * @svc_id:     service identifier
 209  * @cmd_id:     command identifier
 210  * @desc:       Descriptor structure containing arguments and return values
 211  * @res:        Structure containing results from SMC/HVC call
 212  *
 213  * Sends a command to the SCM and waits for the command to finish processing.
 214  * This can be called in atomic context.
 215  */
 216 static int qcom_scm_call_atomic(struct device *dev,
 217                                 const struct qcom_scm_desc *desc,
 218                                 struct qcom_scm_res *res)
 219 {
 220         switch (__get_convention()) {
 221         case SMC_CONVENTION_ARM_32:
 222         case SMC_CONVENTION_ARM_64:
 223                 return scm_smc_call(dev, desc, res, true);
 224         case SMC_CONVENTION_LEGACY:
 225                 return scm_legacy_call_atomic(dev, desc, res);
 226         default:
 227                 pr_err("Unknown current SCM calling convention.\n");
 228                 return -EINVAL;
 229         }
 230 }
 231
 232 static bool __qcom_scm_is_call_available(struct device *dev, u32 svc_id,
 233                                          u32 cmd_id)
 234 {
 235         int ret;
 236         struct qcom_scm_desc desc = {
 237                 .svc = QCOM_SCM_SVC_INFO,
 238                 .cmd = QCOM_SCM_INFO_IS_CALL_AVAIL,
 239                 .owner = ARM_SMCCC_OWNER_SIP,
 240         };
 241         struct qcom_scm_res res;
 242
 243         desc.arginfo = QCOM_SCM_ARGS(1);
 244         switch (__get_convention()) {
 245         case SMC_CONVENTION_ARM_32:
 246         case SMC_CONVENTION_ARM_64:
 247                 desc.args[0] = SCM_SMC_FNID(svc_id, cmd_id) |
 248                                 (ARM_SMCCC_OWNER_SIP << ARM_SMCCC_OWNER_SHIFT);
 249                 break;
 250         case SMC_CONVENTION_LEGACY:
 251                 desc.args[0] = SCM_LEGACY_FNID(svc_id, cmd_id);
 252                 break;
 253         default:
 254                 pr_err("Unknown SMC convention being used\n");
 255                 return false;
 256         }
 257
 258         ret = qcom_scm_call(dev, &desc, &res);
 259
 260         return ret ? false : !!res.result[0];
 261 }
 262
 263 /**
 264  * qcom_scm_set_warm_boot_addr() - Set the warm boot address for cpus
 265  * @entry: Entry point function for the cpus
 266  * @cpus: The cpumask of cpus that will use the entry point
 267  *
 268  * Set the Linux entry point for the SCM to transfer control to when coming
 269  * out of a power down. CPU power down may be executed on cpuidle or hotplug.
 270  */
 271 int qcom_scm_set_warm_boot_addr(void *entry, const cpumask_t *cpus)
 272 {
 273         int ret;
 274         int flags = 0;
 275         int cpu;
 276         struct qcom_scm_desc desc = {
 277                 .svc = QCOM_SCM_SVC_BOOT,
 278                 .cmd = QCOM_SCM_BOOT_SET_ADDR,
 279                 .arginfo = QCOM_SCM_ARGS(2),
 280         };
 281
 282         /*
 283          * Reassign only if we are switching from hotplug entry point
 284          * to cpuidle entry point or vice versa.
 285          */
 286         for_each_cpu(cpu, cpus) {
 287                 if (entry == qcom_scm_wb[cpu].entry)
 288                         continue;
 289                 flags |= qcom_scm_wb[cpu].flag;
 290         }
 291
 292         /* No change in entry function */
 293         if (!flags)
 294                 return 0;
 295
 296         desc.args[0] = flags;
 297         desc.args[1] = virt_to_phys(entry);
 298
 299         ret = qcom_scm_call(__scm->dev, &desc, NULL);
 300         if (!ret) {
 301                 for_each_cpu(cpu, cpus)
 302                         qcom_scm_wb[cpu].entry = entry;
 303         }
 304
 305         return ret;
 306 }
 307 EXPORT_SYMBOL(qcom_scm_set_warm_boot_addr);
 308
 309 /**
 310  * qcom_scm_set_cold_boot_addr() - Set the cold boot address for cpus
 311  * @entry: Entry point function for the cpus
 312  * @cpus: The cpumask of cpus that will use the entry point
 313  *
 314  * Set the cold boot address of the cpus. Any cpu outside the supported
 315  * range would be removed from the cpu present mask.
 316  */
 317 int qcom_scm_set_cold_boot_addr(void *entry, const cpumask_t *cpus)
 318 {
 319         int flags = 0;
 320         int cpu;
 321         int scm_cb_flags[] = {
 322                 QCOM_SCM_FLAG_COLDBOOT_CPU0,
 323                 QCOM_SCM_FLAG_COLDBOOT_CPU1,
 324                 QCOM_SCM_FLAG_COLDBOOT_CPU2,
 325                 QCOM_SCM_FLAG_COLDBOOT_CPU3,
 326         };
 327         struct qcom_scm_desc desc = {
 328                 .svc = QCOM_SCM_SVC_BOOT,
 329                 .cmd = QCOM_SCM_BOOT_SET_ADDR,
 330                 .arginfo = QCOM_SCM_ARGS(2),
 331                 .owner = ARM_SMCCC_OWNER_SIP,
 332         };
 333
 334         if (!cpus || (cpus && cpumask_empty(cpus)))
 335                 return -EINVAL;
 336
 337         for_each_cpu(cpu, cpus) {
 338                 if (cpu < ARRAY_SIZE(scm_cb_flags))
 339                         flags |= scm_cb_flags[cpu];
 340                 else
 341                         set_cpu_present(cpu, false);
 342         }
 343
 344         desc.args[0] = flags;
 345         desc.args[1] = virt_to_phys(entry);
 346
 347         return qcom_scm_call_atomic(__scm ? __scm->dev : NULL, &desc, NULL);
 348 }
 349 EXPORT_SYMBOL(qcom_scm_set_cold_boot_addr);
 350
 351 /**
 352  * qcom_scm_cpu_power_down() - Power down the cpu
 353  * @flags - Flags to flush cache
 354  *
 355  * This is an end point to power down cpu. If there was a pending interrupt,
 356  * the control would return from this function, otherwise, the cpu jumps to the
 357  * warm boot entry point set for this cpu upon reset.
 358  */
 359 void qcom_scm_cpu_power_down(u32 flags)
 360 {
 361         struct qcom_scm_desc desc = {
 362                 .svc = QCOM_SCM_SVC_BOOT,
 363                 .cmd = QCOM_SCM_BOOT_TERMINATE_PC,
 364                 .args[0] = flags & QCOM_SCM_FLUSH_FLAG_MASK,
 365                 .arginfo = QCOM_SCM_ARGS(1),
 366                 .owner = ARM_SMCCC_OWNER_SIP,
 367         };
 368
 369         qcom_scm_call_atomic(__scm ? __scm->dev : NULL, &desc, NULL);
 370 }
 371 EXPORT_SYMBOL(qcom_scm_cpu_power_down);
 372
 373 int qcom_scm_set_remote_state(u32 state, u32 id)
 374 {
 375         struct qcom_scm_desc desc = {
 376                 .svc = QCOM_SCM_SVC_BOOT,
 377                 .cmd = QCOM_SCM_BOOT_SET_REMOTE_STATE,
 378                 .arginfo = QCOM_SCM_ARGS(2),
 379                 .args[0] = state,
 380                 .args[1] = id,
 381                 .owner = ARM_SMCCC_OWNER_SIP,
 382         };
 383         struct qcom_scm_res res;
 384         int ret;
 385
 386         ret = qcom_scm_call(__scm->dev, &desc, &res);
 387
 388         return ret ? : res.result[0];
 389 }
 390 EXPORT_SYMBOL(qcom_scm_set_remote_state);
 391
 392 static int __qcom_scm_set_dload_mode(struct device *dev, bool enable)
 393 {
 394         struct qcom_scm_desc desc = {
 395                 .svc = QCOM_SCM_SVC_BOOT,
 396                 .cmd = QCOM_SCM_BOOT_SET_DLOAD_MODE,
 397                 .arginfo = QCOM_SCM_ARGS(2),
 398                 .args[0] = QCOM_SCM_BOOT_SET_DLOAD_MODE,
 399                 .owner = ARM_SMCCC_OWNER_SIP,
 400         };
 401
 402         desc.args[1] = enable ? QCOM_SCM_BOOT_SET_DLOAD_MODE : 0;
 403
 404         return qcom_scm_call_atomic(__scm->dev, &desc, NULL);
 405 }
 406
 407 static void qcom_scm_set_download_mode(bool enable)
 408 {
 409         bool avail;
 410         int ret = 0;
 411
 412         avail = __qcom_scm_is_call_available(__scm->dev,
 413                                              QCOM_SCM_SVC_BOOT,
 414                                              QCOM_SCM_BOOT_SET_DLOAD_MODE);
 415         if (avail) {
 416                 ret = __qcom_scm_set_dload_mode(__scm->dev, enable);
 417         } else if (__scm->dload_mode_addr) {
 418                 ret = qcom_scm_io_writel(__scm->dload_mode_addr,
 419                                 enable ? QCOM_SCM_BOOT_SET_DLOAD_MODE : 0);
 420         } else {
 421                 dev_err(__scm->dev,
 422                         "No available mechanism for setting download mode\n");
 423         }
 424
 425         if (ret)
 426                 dev_err(__scm->dev, "failed to set download mode: %d\n", ret);
 427 }
 428
 429 /**
 430  * qcom_scm_pas_init_image() - Initialize peripheral authentication service
 431  *                             state machine for a given peripheral, using the
 432  *                             metadata
 433  * @peripheral: peripheral id
 434  * @metadata:   pointer to memory containing ELF header, program header table
 435  *              and optional blob of data used for authenticating the metadata
 436  *              and the rest of the firmware
 437  * @size:       size of the metadata
 438  *
 439  * Returns 0 on success.
 440  */
 441 int qcom_scm_pas_init_image(u32 peripheral, const void *metadata, size_t size)
 442 {
 443         dma_addr_t mdata_phys;
 444         void *mdata_buf;
 445         int ret;
 446         struct qcom_scm_desc desc = {
 447                 .svc = QCOM_SCM_SVC_PIL,
 448                 .cmd = QCOM_SCM_PIL_PAS_INIT_IMAGE,
 449                 .arginfo = QCOM_SCM_ARGS(2, QCOM_SCM_VAL, QCOM_SCM_RW),
 450                 .args[0] = peripheral,
 451                 .owner = ARM_SMCCC_OWNER_SIP,
 452         };
 453         struct qcom_scm_res res;
 454
 455         /*
 456          * During the scm call memory protection will be enabled for the meta
 457          * data blob, so make sure it's physically contiguous, 4K aligned and
 458          * non-cachable to avoid XPU violations.
 459          */
 460         mdata_buf = dma_alloc_coherent(__scm->dev, size, &mdata_phys,
 461                                        GFP_KERNEL);
 462         if (!mdata_buf) {
 463                 dev_err(__scm->dev, "Allocation of metadata buffer failed.\n");
 464                 return -ENOMEM;
 465         }
 466         memcpy(mdata_buf, metadata, size);
 467
 468         ret = qcom_scm_clk_enable();
 469         if (ret)
 470                 goto free_metadata;
 471
 472         desc.args[1] = mdata_phys;
 473
 474         ret = qcom_scm_call(__scm->dev, &desc, &res);
 475
 476         qcom_scm_clk_disable();
 477
 478 free_metadata:
 479         dma_free_coherent(__scm->dev, size, mdata_buf, mdata_phys);
 480
 481         return ret ? : res.result[0];
 482 }
 483 EXPORT_SYMBOL(qcom_scm_pas_init_image);
 484
 485 /**
 486  * qcom_scm_pas_mem_setup() - Prepare the memory related to a given peripheral
 487  *                            for firmware loading
 488  * @peripheral: peripheral id
 489  * @addr:       start address of memory area to prepare
 490  * @size:       size of the memory area to prepare
 491  *
 492  * Returns 0 on success.
 493  */
 494 int qcom_scm_pas_mem_setup(u32 peripheral, phys_addr_t addr, phys_addr_t size)
 495 {
 496         int ret;
 497         struct qcom_scm_desc desc = {
 498                 .svc = QCOM_SCM_SVC_PIL,
 499                 .cmd = QCOM_SCM_PIL_PAS_MEM_SETUP,
 500                 .arginfo = QCOM_SCM_ARGS(3),
 501                 .args[0] = peripheral,
 502                 .args[1] = addr,
 503                 .args[2] = size,
 504                 .owner = ARM_SMCCC_OWNER_SIP,
 505         };
 506         struct qcom_scm_res res;
 507
 508         ret = qcom_scm_clk_enable();
 509         if (ret)
 510                 return ret;
 511
 512         ret = qcom_scm_call(__scm->dev, &desc, &res);
 513         qcom_scm_clk_disable();
 514
 515         return ret ? : res.result[0];
 516 }
 517 EXPORT_SYMBOL(qcom_scm_pas_mem_setup);
 518
 519 /**
 520  * qcom_scm_pas_auth_and_reset() - Authenticate the given peripheral firmware
 521  *                                 and reset the remote processor
 522  * @peripheral: peripheral id
 523  *
 524  * Return 0 on success.
 525  */
 526 int qcom_scm_pas_auth_and_reset(u32 peripheral)
 527 {
 528         int ret;
 529         struct qcom_scm_desc desc = {
 530                 .svc = QCOM_SCM_SVC_PIL,
 531                 .cmd = QCOM_SCM_PIL_PAS_AUTH_AND_RESET,
 532                 .arginfo = QCOM_SCM_ARGS(1),
 533                 .args[0] = peripheral,
 534                 .owner = ARM_SMCCC_OWNER_SIP,
 535         };
 536         struct qcom_scm_res res;
 537
 538         ret = qcom_scm_clk_enable();
 539         if (ret)
 540                 return ret;
 541
 542         ret = qcom_scm_call(__scm->dev, &desc, &res);
 543         qcom_scm_clk_disable();
 544
 545         return ret ? : res.result[0];
 546 }
 547 EXPORT_SYMBOL(qcom_scm_pas_auth_and_reset);
 548
 549 /**
 550  * qcom_scm_pas_shutdown() - Shut down the remote processor
 551  * @peripheral: peripheral id
 552  *
 553  * Returns 0 on success.
 554  */
 555 int qcom_scm_pas_shutdown(u32 peripheral)
 556 {
 557         int ret;
 558         struct qcom_scm_desc desc = {
 559                 .svc = QCOM_SCM_SVC_PIL,
 560                 .cmd = QCOM_SCM_PIL_PAS_SHUTDOWN,
 561                 .arginfo = QCOM_SCM_ARGS(1),
 562                 .args[0] = peripheral,
 563                 .owner = ARM_SMCCC_OWNER_SIP,
 564         };
 565         struct qcom_scm_res res;
 566
 567         ret = qcom_scm_clk_enable();
 568         if (ret)
 569                 return ret;
 570
 571         ret = qcom_scm_call(__scm->dev, &desc, &res);
 572
 573         qcom_scm_clk_disable();
 574
 575         return ret ? : res.result[0];
 576 }
 577 EXPORT_SYMBOL(qcom_scm_pas_shutdown);
 578
 579 /**
 580  * qcom_scm_pas_supported() - Check if the peripheral authentication service is
 581  *                            available for the given peripherial
 582  * @peripheral: peripheral id
 583  *
 584  * Returns true if PAS is supported for this peripheral, otherwise false.
 585  */
 586 bool qcom_scm_pas_supported(u32 peripheral)
 587 {
 588         int ret;
 589         struct qcom_scm_desc desc = {
 590                 .svc = QCOM_SCM_SVC_PIL,
 591                 .cmd = QCOM_SCM_PIL_PAS_IS_SUPPORTED,
 592                 .arginfo = QCOM_SCM_ARGS(1),
 593                 .args[0] = peripheral,
 594                 .owner = ARM_SMCCC_OWNER_SIP,
 595         };
 596         struct qcom_scm_res res;
 597
 598         if (!__qcom_scm_is_call_available(__scm->dev, QCOM_SCM_SVC_PIL,
 599                                           QCOM_SCM_PIL_PAS_IS_SUPPORTED))
 600                 return false;
 601
 602         ret = qcom_scm_call(__scm->dev, &desc, &res);
 603
 604         return ret ? false : !!res.result[0];
 605 }
 606 EXPORT_SYMBOL(qcom_scm_pas_supported);
 607
 608 static int __qcom_scm_pas_mss_reset(struct device *dev, bool reset)
 609 {
 610         struct qcom_scm_desc desc = {
 611                 .svc = QCOM_SCM_SVC_PIL,
 612                 .cmd = QCOM_SCM_PIL_PAS_MSS_RESET,
 613                 .arginfo = QCOM_SCM_ARGS(2),
 614                 .args[0] = reset,
 615                 .args[1] = 0,
 616                 .owner = ARM_SMCCC_OWNER_SIP,
 617         };
 618         struct qcom_scm_res res;
 619         int ret;
 620
 621         ret = qcom_scm_call(__scm->dev, &desc, &res);
 622
 623         return ret ? : res.result[0];
 624 }
 625
 626 static int qcom_scm_pas_reset_assert(struct reset_controller_dev *rcdev,
 627                                      unsigned long idx)
 628 {
 629         if (idx != 0)
 630                 return -EINVAL;
 631
 632         return __qcom_scm_pas_mss_reset(__scm->dev, 1);
 633 }
 634
 635 static int qcom_scm_pas_reset_deassert(struct reset_controller_dev *rcdev,
 636                                        unsigned long idx)
 637 {
 638         if (idx != 0)
 639                 return -EINVAL;
 640
 641         return __qcom_scm_pas_mss_reset(__scm->dev, 0);
 642 }
 643
 644 static const struct reset_control_ops qcom_scm_pas_reset_ops = {
 645         .assert = qcom_scm_pas_reset_assert,
 646         .deassert = qcom_scm_pas_reset_deassert,
 647 };
 648
 649 int qcom_scm_io_readl(phys_addr_t addr, unsigned int *val)
 650 {
 651         struct qcom_scm_desc desc = {
 652                 .svc = QCOM_SCM_SVC_IO,
 653                 .cmd = QCOM_SCM_IO_READ,
 654                 .arginfo = QCOM_SCM_ARGS(1),
 655                 .args[0] = addr,
 656                 .owner = ARM_SMCCC_OWNER_SIP,
 657         };
 658         struct qcom_scm_res res;
 659         int ret;
 660
 661
 662         ret = qcom_scm_call_atomic(__scm->dev, &desc, &res);
 663         if (ret >= 0)
 664                 *val = res.result[0];
 665
 666         return ret < 0 ? ret : 0;
 667 }
 668 EXPORT_SYMBOL(qcom_scm_io_readl);
 669
 670 int qcom_scm_io_writel(phys_addr_t addr, unsigned int val)
 671 {
 672         struct qcom_scm_desc desc = {
 673                 .svc = QCOM_SCM_SVC_IO,
 674                 .cmd = QCOM_SCM_IO_WRITE,
 675                 .arginfo = QCOM_SCM_ARGS(2),
 676                 .args[0] = addr,
 677                 .args[1] = val,
 678                 .owner = ARM_SMCCC_OWNER_SIP,
 679         };
 680
 681         return qcom_scm_call_atomic(__scm->dev, &desc, NULL);
 682 }
 683 EXPORT_SYMBOL(qcom_scm_io_writel);
 684
 685 /**
 686  * qcom_scm_restore_sec_cfg_available() - Check if secure environment
 687  * supports restore security config interface.
 688  *
 689  * Return true if restore-cfg interface is supported, false if not.
 690  */
 691 bool qcom_scm_restore_sec_cfg_available(void)
 692 {
 693         return __qcom_scm_is_call_available(__scm->dev, QCOM_SCM_SVC_MP,
 694                                             QCOM_SCM_MP_RESTORE_SEC_CFG);
 695 }
 696 EXPORT_SYMBOL(qcom_scm_restore_sec_cfg_available);
 697
 698 int qcom_scm_restore_sec_cfg(u32 device_id, u32 spare)
 699 {
 700         struct qcom_scm_desc desc = {
 701                 .svc = QCOM_SCM_SVC_MP,
 702                 .cmd = QCOM_SCM_MP_RESTORE_SEC_CFG,
 703                 .arginfo = QCOM_SCM_ARGS(2),
 704                 .args[0] = device_id,
 705                 .args[1] = spare,
 706                 .owner = ARM_SMCCC_OWNER_SIP,
 707         };
 708         struct qcom_scm_res res;
 709         int ret;
 710
 711         ret = qcom_scm_call(__scm->dev, &desc, &res);
 712
 713         return ret ? : res.result[0];
 714 }
 715 EXPORT_SYMBOL(qcom_scm_restore_sec_cfg);
 716
 717 int qcom_scm_iommu_secure_ptbl_size(u32 spare, size_t *size)
 718 {
 719         struct qcom_scm_desc desc = {
 720                 .svc = QCOM_SCM_SVC_MP,
 721                 .cmd = QCOM_SCM_MP_IOMMU_SECURE_PTBL_SIZE,
 722                 .arginfo = QCOM_SCM_ARGS(1),
 723                 .args[0] = spare,
 724                 .owner = ARM_SMCCC_OWNER_SIP,
 725         };
 726         struct qcom_scm_res res;
 727         int ret;
 728
 729         ret = qcom_scm_call(__scm->dev, &desc, &res);
 730
 731         if (size)
 732                 *size = res.result[0];
 733
 734         return ret ? : res.result[1];
 735 }
 736 EXPORT_SYMBOL(qcom_scm_iommu_secure_ptbl_size);
 737
 738 int qcom_scm_iommu_secure_ptbl_init(u64 addr, u32 size, u32 spare)
 739 {
 740         struct qcom_scm_desc desc = {
 741                 .svc = QCOM_SCM_SVC_MP,
 742                 .cmd = QCOM_SCM_MP_IOMMU_SECURE_PTBL_INIT,
 743                 .arginfo = QCOM_SCM_ARGS(3, QCOM_SCM_RW, QCOM_SCM_VAL,
 744                                          QCOM_SCM_VAL),
 745                 .args[0] = addr,
 746                 .args[1] = size,
 747                 .args[2] = spare,
 748                 .owner = ARM_SMCCC_OWNER_SIP,
 749         };
 750         int ret;
 751
 752         ret = qcom_scm_call(__scm->dev, &desc, NULL);
 753
 754         /* the pg table has been initialized already, ignore the error */
 755         if (ret == -EPERM)
 756                 ret = 0;
 757
 758         return ret;
 759 }
 760 EXPORT_SYMBOL(qcom_scm_iommu_secure_ptbl_init);
 761
 762 int qcom_scm_mem_protect_video_var(u32 cp_start, u32 cp_size,
 763                                    u32 cp_nonpixel_start,
 764                                    u32 cp_nonpixel_size)
 765 {
 766         int ret;
 767         struct qcom_scm_desc desc = {
 768                 .svc = QCOM_SCM_SVC_MP,
 769                 .cmd = QCOM_SCM_MP_VIDEO_VAR,
 770                 .arginfo = QCOM_SCM_ARGS(4, QCOM_SCM_VAL, QCOM_SCM_VAL,
 771                                          QCOM_SCM_VAL, QCOM_SCM_VAL),
 772                 .args[0] = cp_start,
 773                 .args[1] = cp_size,
 774                 .args[2] = cp_nonpixel_start,
 775                 .args[3] = cp_nonpixel_size,
 776                 .owner = ARM_SMCCC_OWNER_SIP,
 777         };
 778         struct qcom_scm_res res;
 779
 780         ret = qcom_scm_call(__scm->dev, &desc, &res);
 781
 782         return ret ? : res.result[0];
 783 }
 784 EXPORT_SYMBOL(qcom_scm_mem_protect_video_var);
 785
 786 static int __qcom_scm_assign_mem(struct device *dev, phys_addr_t mem_region,
 787                                  size_t mem_sz, phys_addr_t src, size_t src_sz,
 788                                  phys_addr_t dest, size_t dest_sz)
 789 {
 790         int ret;
 791         struct qcom_scm_desc desc = {
 792                 .svc = QCOM_SCM_SVC_MP,
 793                 .cmd = QCOM_SCM_MP_ASSIGN,
 794                 .arginfo = QCOM_SCM_ARGS(7, QCOM_SCM_RO, QCOM_SCM_VAL,
 795                                          QCOM_SCM_RO, QCOM_SCM_VAL, QCOM_SCM_RO,
 796                                          QCOM_SCM_VAL, QCOM_SCM_VAL),
 797                 .args[0] = mem_region,
 798                 .args[1] = mem_sz,
 799                 .args[2] = src,
 800                 .args[3] = src_sz,
 801                 .args[4] = dest,
 802                 .args[5] = dest_sz,
 803                 .args[6] = 0,
 804                 .owner = ARM_SMCCC_OWNER_SIP,
 805         };
 806         struct qcom_scm_res res;
 807
 808         ret = qcom_scm_call(dev, &desc, &res);
 809
 810         return ret ? : res.result[0];
 811 }
 812
 813 /**
 814  * qcom_scm_assign_mem() - Make a secure call to reassign memory ownership
 815  * @mem_addr: mem region whose ownership need to be reassigned
 816  * @mem_sz:   size of the region.
 817  * @srcvm:    vmid for current set of owners, each set bit in
 818  *            flag indicate a unique owner
 819  * @newvm:    array having new owners and corresponding permission
 820  *            flags
 821  * @dest_cnt: number of owners in next set.
 822  *
 823  * Return negative errno on failure or 0 on success with @srcvm updated.
 824  */
 825 int qcom_scm_assign_mem(phys_addr_t mem_addr, size_t mem_sz,
 826                         unsigned int *srcvm,
 827                         const struct qcom_scm_vmperm *newvm,
 828                         unsigned int dest_cnt)
 829 {
 830         struct qcom_scm_current_perm_info *destvm;
 831         struct qcom_scm_mem_map_info *mem_to_map;
 832         phys_addr_t mem_to_map_phys;
 833         phys_addr_t dest_phys;
 834         dma_addr_t ptr_phys;
 835         size_t mem_to_map_sz;
 836         size_t dest_sz;
 837         size_t src_sz;
 838         size_t ptr_sz;
 839         int next_vm;
 840         __le32 *src;
 841         void *ptr;
 842         int ret, i, b;
 843         unsigned long srcvm_bits = *srcvm;
 844
 845         src_sz = hweight_long(srcvm_bits) * sizeof(*src);
 846         mem_to_map_sz = sizeof(*mem_to_map);
 847         dest_sz = dest_cnt * sizeof(*destvm);
 848         ptr_sz = ALIGN(src_sz, SZ_64) + ALIGN(mem_to_map_sz, SZ_64) +
 849                         ALIGN(dest_sz, SZ_64);
 850
 851         ptr = dma_alloc_coherent(__scm->dev, ptr_sz, &ptr_phys, GFP_KERNEL);
 852         if (!ptr)
 853                 return -ENOMEM;
 854
 855         /* Fill source vmid detail */
 856         src = ptr;
 857         i = 0;
 858         for_each_set_bit(b, &srcvm_bits, BITS_PER_LONG)
 859                 src[i++] = cpu_to_le32(b);
 860
 861         /* Fill details of mem buff to map */
 862         mem_to_map = ptr + ALIGN(src_sz, SZ_64);
 863         mem_to_map_phys = ptr_phys + ALIGN(src_sz, SZ_64);
 864         mem_to_map->mem_addr = cpu_to_le64(mem_addr);
 865         mem_to_map->mem_size = cpu_to_le64(mem_sz);
 866
 867         next_vm = 0;
 868         /* Fill details of next vmid detail */
 869         destvm = ptr + ALIGN(mem_to_map_sz, SZ_64) + ALIGN(src_sz, SZ_64);
 870         dest_phys = ptr_phys + ALIGN(mem_to_map_sz, SZ_64) + ALIGN(src_sz, SZ_64);
 871         for (i = 0; i < dest_cnt; i++, destvm++, newvm++) {
 872                 destvm->vmid = cpu_to_le32(newvm->vmid);
 873                 destvm->perm = cpu_to_le32(newvm->perm);
 874                 destvm->ctx = 0;
 875                 destvm->ctx_size = 0;
 876                 next_vm |= BIT(newvm->vmid);
 877         }
 878
 879         ret = __qcom_scm_assign_mem(__scm->dev, mem_to_map_phys, mem_to_map_sz,
 880                                     ptr_phys, src_sz, dest_phys, dest_sz);
 881         dma_free_coherent(__scm->dev, ptr_sz, ptr, ptr_phys);
 882         if (ret) {
 883                 dev_err(__scm->dev,
 884                         "Assign memory protection call failed %d\n", ret);
 885                 return -EINVAL;
 886         }
 887
 888         *srcvm = next_vm;
 889         return 0;
 890 }
 891 EXPORT_SYMBOL(qcom_scm_assign_mem);
 892
 893 /**
 894  * qcom_scm_ocmem_lock_available() - is OCMEM lock/unlock interface available
 895  */
 896 bool qcom_scm_ocmem_lock_available(void)
 897 {
 898         return __qcom_scm_is_call_available(__scm->dev, QCOM_SCM_SVC_OCMEM,
 899                                             QCOM_SCM_OCMEM_LOCK_CMD);
 900 }
 901 EXPORT_SYMBOL(qcom_scm_ocmem_lock_available);
 902
 903 /**
 904  * qcom_scm_ocmem_lock() - call OCMEM lock interface to assign an OCMEM
 905  * region to the specified initiator
 906  *
 907  * @id:     tz initiator id
 908  * @offset: OCMEM offset
 909  * @size:   OCMEM size
 910  * @mode:   access mode (WIDE/NARROW)
 911  */
 912 int qcom_scm_ocmem_lock(enum qcom_scm_ocmem_client id, u32 offset, u32 size,
 913                         u32 mode)
 914 {
 915         struct qcom_scm_desc desc = {
 916                 .svc = QCOM_SCM_SVC_OCMEM,
 917                 .cmd = QCOM_SCM_OCMEM_LOCK_CMD,
 918                 .args[0] = id,
 919                 .args[1] = offset,
 920                 .args[2] = size,
 921                 .args[3] = mode,
 922                 .arginfo = QCOM_SCM_ARGS(4),
 923         };
 924
 925         return qcom_scm_call(__scm->dev, &desc, NULL);
 926 }
 927 EXPORT_SYMBOL(qcom_scm_ocmem_lock);
 928
 929 /**
 930  * qcom_scm_ocmem_unlock() - call OCMEM unlock interface to release an OCMEM
 931  * region from the specified initiator
 932  *
 933  * @id:     tz initiator id
 934  * @offset: OCMEM offset
 935  * @size:   OCMEM size
 936  */
 937 int qcom_scm_ocmem_unlock(enum qcom_scm_ocmem_client id, u32 offset, u32 size)
 938 {
 939         struct qcom_scm_desc desc = {
 940                 .svc = QCOM_SCM_SVC_OCMEM,
 941                 .cmd = QCOM_SCM_OCMEM_UNLOCK_CMD,
 942                 .args[0] = id,
 943                 .args[1] = offset,
 944                 .args[2] = size,
 945                 .arginfo = QCOM_SCM_ARGS(3),
 946         };
 947
 948         return qcom_scm_call(__scm->dev, &desc, NULL);
 949 }
 950 EXPORT_SYMBOL(qcom_scm_ocmem_unlock);
 951
 952 /**
 953  * qcom_scm_ice_available() - Is the ICE key programming interface available?
 954  *
 955  * Return: true iff the SCM calls wrapped by qcom_scm_ice_invalidate_key() and
 956  *         qcom_scm_ice_set_key() are available.
 957  */
 958 bool qcom_scm_ice_available(void)
 959 {
 960         return __qcom_scm_is_call_available(__scm->dev, QCOM_SCM_SVC_ES,
 961                                             QCOM_SCM_ES_INVALIDATE_ICE_KEY) &&
 962                 __qcom_scm_is_call_available(__scm->dev, QCOM_SCM_SVC_ES,
 963                                              QCOM_SCM_ES_CONFIG_SET_ICE_KEY);
 964 }
 965 EXPORT_SYMBOL(qcom_scm_ice_available);
 966
 967 /**
 968  * qcom_scm_ice_invalidate_key() - Invalidate an inline encryption key
 969  * @index: the keyslot to invalidate
 970  *
 971  * The UFSHCI standard defines a standard way to do this, but it doesn't work on
 972  * these SoCs; only this SCM call does.
 973  *
 974  * Return: 0 on success; -errno on failure.
 975  */
 976 int qcom_scm_ice_invalidate_key(u32 index)
 977 {
 978         struct qcom_scm_desc desc = {
 979                 .svc = QCOM_SCM_SVC_ES,
 980                 .cmd = QCOM_SCM_ES_INVALIDATE_ICE_KEY,
 981                 .arginfo = QCOM_SCM_ARGS(1),
 982                 .args[0] = index,
 983                 .owner = ARM_SMCCC_OWNER_SIP,
 984         };
 985
 986         return qcom_scm_call(__scm->dev, &desc, NULL);
 987 }
 988 EXPORT_SYMBOL(qcom_scm_ice_invalidate_key);
 989
 990 /**
 991  * qcom_scm_ice_set_key() - Set an inline encryption key
 992  * @index: the keyslot into which to set the key
 993  * @key: the key to program
 994  * @key_size: the size of the key in bytes
 995  * @cipher: the encryption algorithm the key is for
 996  * @data_unit_size: the encryption data unit size, i.e. the size of each
 997  *                  individual plaintext and ciphertext.  Given in 512-byte
 998  *                  units, e.g. 1 = 512 bytes, 8 = 4096 bytes, etc.
 999  *
1000  * Program a key into a keyslot of Qualcomm ICE (Inline Crypto Engine), where it
1001  * can then be used to encrypt/decrypt UFS I/O requests inline.
1002  *
1003  * The UFSHCI standard defines a standard way to do this, but it doesn't work on
1004  * these SoCs; only this SCM call does.
1005  *
1006  * Return: 0 on success; -errno on failure.
1007  */
1008 int qcom_scm_ice_set_key(u32 index, const u8 *key, u32 key_size,
1009                          enum qcom_scm_ice_cipher cipher, u32 data_unit_size)
1010 {
1011         struct qcom_scm_desc desc = {
1012                 .svc = QCOM_SCM_SVC_ES,
1013                 .cmd = QCOM_SCM_ES_CONFIG_SET_ICE_KEY,
1014                 .arginfo = QCOM_SCM_ARGS(5, QCOM_SCM_VAL, QCOM_SCM_RW,
1015                                          QCOM_SCM_VAL, QCOM_SCM_VAL,
1016                                          QCOM_SCM_VAL),
1017                 .args[0] = index,
1018                 .args[2] = key_size,
1019                 .args[3] = cipher,
1020                 .args[4] = data_unit_size,
1021                 .owner = ARM_SMCCC_OWNER_SIP,
1022         };
1023         void *keybuf;
1024         dma_addr_t key_phys;
1025         int ret;
1026
1027         /*
1028          * 'key' may point to vmalloc()'ed memory, but we need to pass a
1029          * physical address that's been properly flushed.  The sanctioned way to
1030          * do this is by using the DMA API.  But as is best practice for crypto
1031          * keys, we also must wipe the key after use.  This makes kmemdup() +
1032          * dma_map_single() not clearly correct, since the DMA API can use
1033          * bounce buffers.  Instead, just use dma_alloc_coherent().  Programming
1034          * keys is normally rare and thus not performance-critical.
1035          */
1036
1037         keybuf = dma_alloc_coherent(__scm->dev, key_size, &key_phys,
1038                                     GFP_KERNEL);
1039         if (!keybuf)
1040                 return -ENOMEM;
1041         memcpy(keybuf, key, key_size);
1042         desc.args[1] = key_phys;
1043
1044         ret = qcom_scm_call(__scm->dev, &desc, NULL);
1045
1046         memzero_explicit(keybuf, key_size);
1047
1048         dma_free_coherent(__scm->dev, key_size, keybuf, key_phys);
1049         return ret;
1050 }
1051 EXPORT_SYMBOL(qcom_scm_ice_set_key);
1052
1053 /**
1054  * qcom_scm_hdcp_available() - Check if secure environment supports HDCP.
1055  *
1056  * Return true if HDCP is supported, false if not.
1057  */
1058 bool qcom_scm_hdcp_available(void)
1059 {
1060         bool avail;
1061         int ret = qcom_scm_clk_enable();
1062
1063         if (ret)
1064                 return ret;
1065
1066         avail = __qcom_scm_is_call_available(__scm->dev, QCOM_SCM_SVC_HDCP,
1067                                                 QCOM_SCM_HDCP_INVOKE);
1068
1069         qcom_scm_clk_disable();
1070
1071         return avail;
1072 }
1073 EXPORT_SYMBOL(qcom_scm_hdcp_available);
1074
1075 /**
1076  * qcom_scm_hdcp_req() - Send HDCP request.
1077  * @req: HDCP request array
1078  * @req_cnt: HDCP request array count
1079  * @resp: response buffer passed to SCM
1080  *
1081  * Write HDCP register(s) through SCM.
1082  */
1083 int qcom_scm_hdcp_req(struct qcom_scm_hdcp_req *req, u32 req_cnt, u32 *resp)
1084 {
1085         int ret;
1086         struct qcom_scm_desc desc = {
1087                 .svc = QCOM_SCM_SVC_HDCP,
1088                 .cmd = QCOM_SCM_HDCP_INVOKE,
1089                 .arginfo = QCOM_SCM_ARGS(10),
1090                 .args = {
1091                         req[0].addr,
1092                         req[0].val,
1093                         req[1].addr,
1094                         req[1].val,
1095                         req[2].addr,
1096                         req[2].val,
1097                         req[3].addr,
1098                         req[3].val,
1099                         req[4].addr,
1100                         req[4].val
1101                 },
1102                 .owner = ARM_SMCCC_OWNER_SIP,
1103         };
1104         struct qcom_scm_res res;
1105
1106         if (req_cnt > QCOM_SCM_HDCP_MAX_REQ_CNT)
1107                 return -ERANGE;
1108
1109         ret = qcom_scm_clk_enable();
1110         if (ret)
1111                 return ret;
1112
1113         ret = qcom_scm_call(__scm->dev, &desc, &res);
1114         *resp = res.result[0];
1115
1116         qcom_scm_clk_disable();
1117
1118         return ret;
1119 }
1120 EXPORT_SYMBOL(qcom_scm_hdcp_req);
1121
1122 int qcom_scm_qsmmu500_wait_safe_toggle(bool en)
1123 {
1124         struct qcom_scm_desc desc = {
1125                 .svc = QCOM_SCM_SVC_SMMU_PROGRAM,
1126                 .cmd = QCOM_SCM_SMMU_CONFIG_ERRATA1,
1127                 .arginfo = QCOM_SCM_ARGS(2),
1128                 .args[0] = QCOM_SCM_SMMU_CONFIG_ERRATA1_CLIENT_ALL,
1129                 .args[1] = en,
1130                 .owner = ARM_SMCCC_OWNER_SIP,
1131         };
1132
1133
1134         return qcom_scm_call_atomic(__scm->dev, &desc, NULL);
1135 }
1136 EXPORT_SYMBOL(qcom_scm_qsmmu500_wait_safe_toggle);
1137
1138 static int qcom_scm_find_dload_address(struct device *dev, u64 *addr)
1139 {
1140         struct device_node *tcsr;
1141         struct device_node *np = dev->of_node;
1142         struct resource res;
1143         u32 offset;
1144         int ret;
1145
1146         tcsr = of_parse_phandle(np, "qcom,dload-mode", 0);
1147         if (!tcsr)
1148                 return 0;
1149
1150         ret = of_address_to_resource(tcsr, 0, &res);
1151         of_node_put(tcsr);
1152         if (ret)
1153                 return ret;
1154
1155         ret = of_property_read_u32_index(np, "qcom,dload-mode", 1, &offset);
1156         if (ret < 0)
1157                 return ret;
1158
1159         *addr = res.start + offset;
1160
1161         return 0;
1162 }
1163
1164 /**
1165  * qcom_scm_is_available() - Checks if SCM is available
1166  */
1167 bool qcom_scm_is_available(void)
1168 {
1169         return !!__scm;
1170 }
1171 EXPORT_SYMBOL(qcom_scm_is_available);
1172
1173 static int qcom_scm_probe(struct platform_device *pdev)
1174 {
1175         struct qcom_scm *scm;
1176         unsigned long clks;
1177         int ret;
1178
1179         scm = devm_kzalloc(&pdev->dev, sizeof(*scm), GFP_KERNEL);
1180         if (!scm)
1181                 return -ENOMEM;
1182
1183         ret = qcom_scm_find_dload_address(&pdev->dev, &scm->dload_mode_addr);
1184         if (ret < 0)
1185                 return ret;
1186
1187         clks = (unsigned long)of_device_get_match_data(&pdev->dev);
1188
1189         scm->core_clk = devm_clk_get(&pdev->dev, "core");
1190         if (IS_ERR(scm->core_clk)) {
1191                 if (PTR_ERR(scm->core_clk) == -EPROBE_DEFER)
1192                         return PTR_ERR(scm->core_clk);
1193
1194                 if (clks & SCM_HAS_CORE_CLK) {
1195                         dev_err(&pdev->dev, "failed to acquire core clk\n");
1196                         return PTR_ERR(scm->core_clk);
1197                 }
1198
1199                 scm->core_clk = NULL;
1200         }
1201
1202         scm->iface_clk = devm_clk_get(&pdev->dev, "iface");
1203         if (IS_ERR(scm->iface_clk)) {
1204                 if (PTR_ERR(scm->iface_clk) == -EPROBE_DEFER)
1205                         return PTR_ERR(scm->iface_clk);
1206
1207                 if (clks & SCM_HAS_IFACE_CLK) {
1208                         dev_err(&pdev->dev, "failed to acquire iface clk\n");
1209                         return PTR_ERR(scm->iface_clk);
1210                 }
1211
1212                 scm->iface_clk = NULL;
1213         }
1214
1215         scm->bus_clk = devm_clk_get(&pdev->dev, "bus");
1216         if (IS_ERR(scm->bus_clk)) {
1217                 if (PTR_ERR(scm->bus_clk) == -EPROBE_DEFER)
1218                         return PTR_ERR(scm->bus_clk);
1219
1220                 if (clks & SCM_HAS_BUS_CLK) {
1221                         dev_err(&pdev->dev, "failed to acquire bus clk\n");
1222                         return PTR_ERR(scm->bus_clk);
1223                 }
1224
1225                 scm->bus_clk = NULL;
1226         }
1227
1228         scm->reset.ops = &qcom_scm_pas_reset_ops;
1229         scm->reset.nr_resets = 1;
1230         scm->reset.of_node = pdev->dev.of_node;
1231         ret = devm_reset_controller_register(&pdev->dev, &scm->reset);
1232         if (ret)
1233                 return ret;
1234
1235         /* vote for max clk rate for highest performance */
1236         ret = clk_set_rate(scm->core_clk, INT_MAX);
1237         if (ret)
1238                 return ret;
1239
1240         __scm = scm;
1241         __scm->dev = &pdev->dev;
1242
1243         __get_convention();
1244
1245         /*
1246          * If requested enable "download mode", from this point on warmboot
1247          * will cause the the boot stages to enter download mode, unless
1248          * disabled below by a clean shutdown/reboot.
1249          */
1250         if (download_mode)
1251                 qcom_scm_set_download_mode(true);
1252
1253         return 0;
1254 }
1255
1256 static void qcom_scm_shutdown(struct platform_device *pdev)
1257 {
1258         /* Clean shutdown, disable download mode to allow normal restart */
1259         if (download_mode)
1260                 qcom_scm_set_download_mode(false);
1261 }
1262
1263 static const struct of_device_id qcom_scm_dt_match[] = {
1264         { .compatible = "qcom,scm-apq8064",
1265           /* FIXME: This should have .data = (void *) SCM_HAS_CORE_CLK */
1266         },
1267         { .compatible = "qcom,scm-apq8084", .data = (void *)(SCM_HAS_CORE_CLK |
1268                                                              SCM_HAS_IFACE_CLK |
1269                                                              SCM_HAS_BUS_CLK)
1270         },
1271         { .compatible = "qcom,scm-ipq4019" },
1272         { .compatible = "qcom,scm-msm8660", .data = (void *) SCM_HAS_CORE_CLK },
1273         { .compatible = "qcom,scm-msm8960", .data = (void *) SCM_HAS_CORE_CLK },
1274         { .compatible = "qcom,scm-msm8916", .data = (void *)(SCM_HAS_CORE_CLK |
1275                                                              SCM_HAS_IFACE_CLK |
1276                                                              SCM_HAS_BUS_CLK)
1277         },
1278         { .compatible = "qcom,scm-msm8974", .data = (void *)(SCM_HAS_CORE_CLK |
1279                                                              SCM_HAS_IFACE_CLK |
1280                                                              SCM_HAS_BUS_CLK)
1281         },
1282         { .compatible = "qcom,scm-msm8994" },
1283         { .compatible = "qcom,scm-msm8996" },
1284         { .compatible = "qcom,scm" },
1285         {}
1286 };
1287
1288 static struct platform_driver qcom_scm_driver = {
1289         .driver = {
1290                 .name   = "qcom_scm",
1291                 .of_match_table = qcom_scm_dt_match,
1292         },
1293         .probe = qcom_scm_probe,
1294         .shutdown = qcom_scm_shutdown,
1295 };
1296
1297 static int __init qcom_scm_init(void)
1298 {
1299         return platform_driver_register(&qcom_scm_driver);
1300 }
1301 subsys_initcall(qcom_scm_init);