root/drivers/hwtracing/coresight/coresight-cpu-debug.c

DEFINITIONS

1. debug_os_unlock
2. debug_access_permitted
3. debug_force_cpu_powered_up
4. debug_read_regs
5. debug_adjust_pc
6. debug_adjust_pc
7. debug_dump_regs
8. debug_init_arch_data
9. debug_notifier_call
10. debug_enable_func
11. debug_disable_func
12. debug_func_knob_write
13. debug_func_knob_read
14. debug_func_init
15. debug_func_exit
16. debug_probe
17. debug_remove

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (c) 2017 Linaro Limited. All rights reserved.
   4  *
   5  * Author: Leo Yan <leo.yan@linaro.org>
   6  */
   7 #include <linux/amba/bus.h>
   8 #include <linux/coresight.h>
   9 #include <linux/cpu.h>
  10 #include <linux/debugfs.h>
  11 #include <linux/delay.h>
  12 #include <linux/device.h>
  13 #include <linux/err.h>
  14 #include <linux/init.h>
  15 #include <linux/io.h>
  16 #include <linux/iopoll.h>
  17 #include <linux/kernel.h>
  18 #include <linux/module.h>
  19 #include <linux/moduleparam.h>
  20 #include <linux/pm_qos.h>
  21 #include <linux/slab.h>
  22 #include <linux/smp.h>
  23 #include <linux/types.h>
  24 #include <linux/uaccess.h>
  25 
  26 #include "coresight-priv.h"
  27 
  28 #define EDPCSR                          0x0A0
  29 #define EDCIDSR                         0x0A4
  30 #define EDVIDSR                         0x0A8
  31 #define EDPCSR_HI                       0x0AC
  32 #define EDOSLAR                         0x300
  33 #define EDPRCR                          0x310
  34 #define EDPRSR                          0x314
  35 #define EDDEVID1                        0xFC4
  36 #define EDDEVID                         0xFC8
  37 
  38 #define EDPCSR_PROHIBITED               0xFFFFFFFF
  39 
  40 /* bits definition for EDPCSR */
  41 #define EDPCSR_THUMB                    BIT(0)
  42 #define EDPCSR_ARM_INST_MASK            GENMASK(31, 2)
  43 #define EDPCSR_THUMB_INST_MASK          GENMASK(31, 1)
  44 
  45 /* bits definition for EDPRCR */
  46 #define EDPRCR_COREPURQ                 BIT(3)
  47 #define EDPRCR_CORENPDRQ                BIT(0)
  48 
  49 /* bits definition for EDPRSR */
  50 #define EDPRSR_DLK                      BIT(6)
  51 #define EDPRSR_PU                       BIT(0)
  52 
  53 /* bits definition for EDVIDSR */
  54 #define EDVIDSR_NS                      BIT(31)
  55 #define EDVIDSR_E2                      BIT(30)
  56 #define EDVIDSR_E3                      BIT(29)
  57 #define EDVIDSR_HV                      BIT(28)
  58 #define EDVIDSR_VMID                    GENMASK(7, 0)
  59 
  60 /*
  61  * bits definition for EDDEVID1:PSCROffset
  62  *
  63  * NOTE: armv8 and armv7 have different definition for the register,
  64  * so consolidate the bits definition as below:
  65  *
  66  * 0b0000 - Sample offset applies based on the instruction state, we
  67  *          rely on EDDEVID to check if EDPCSR is implemented or not
  68  * 0b0001 - No offset applies.
  69  * 0b0010 - No offset applies, but do not use in AArch32 mode
  70  *
  71  */
  72 #define EDDEVID1_PCSR_OFFSET_MASK       GENMASK(3, 0)
  73 #define EDDEVID1_PCSR_OFFSET_INS_SET    (0x0)
  74 #define EDDEVID1_PCSR_NO_OFFSET_DIS_AARCH32     (0x2)
  75 
  76 /* bits definition for EDDEVID */
  77 #define EDDEVID_PCSAMPLE_MODE           GENMASK(3, 0)
  78 #define EDDEVID_IMPL_EDPCSR             (0x1)
  79 #define EDDEVID_IMPL_EDPCSR_EDCIDSR     (0x2)
  80 #define EDDEVID_IMPL_FULL               (0x3)
  81 
  82 #define DEBUG_WAIT_SLEEP                1000
  83 #define DEBUG_WAIT_TIMEOUT              32000
  84 
  85 struct debug_drvdata {
  86         void __iomem    *base;
  87         struct device   *dev;
  88         int             cpu;
  89 
  90         bool            edpcsr_present;
  91         bool            edcidsr_present;
  92         bool            edvidsr_present;
  93         bool            pc_has_offset;
  94 
  95         u32             edpcsr;
  96         u32             edpcsr_hi;
  97         u32             edprsr;
  98         u32             edvidsr;
  99         u32             edcidsr;
 100 };
 101 
 102 static DEFINE_MUTEX(debug_lock);
 103 static DEFINE_PER_CPU(struct debug_drvdata *, debug_drvdata);
 104 static int debug_count;
 105 static struct dentry *debug_debugfs_dir;
 106 
 107 static bool debug_enable;
 108 module_param_named(enable, debug_enable, bool, 0600);
 109 MODULE_PARM_DESC(enable, "Control to enable coresight CPU debug functionality");
 110 
 111 static void debug_os_unlock(struct debug_drvdata *drvdata)
 112 {
 113         /* Unlocks the debug registers */
 114         writel_relaxed(0x0, drvdata->base + EDOSLAR);
 115 
 116         /* Make sure the registers are unlocked before accessing */
 117         wmb();
 118 }
 119 
 120 /*
 121  * According to ARM DDI 0487A.k, before access external debug
 122  * registers should firstly check the access permission; if any
 123  * below condition has been met then cannot access debug
 124  * registers to avoid lockup issue:
 125  *
 126  * - CPU power domain is powered off;
 127  * - The OS Double Lock is locked;
 128  *
 129  * By checking EDPRSR can get to know if meet these conditions.
 130  */
 131 static bool debug_access_permitted(struct debug_drvdata *drvdata)
 132 {
 133         /* CPU is powered off */
 134         if (!(drvdata->edprsr & EDPRSR_PU))
 135                 return false;
 136 
 137         /* The OS Double Lock is locked */
 138         if (drvdata->edprsr & EDPRSR_DLK)
 139                 return false;
 140 
 141         return true;
 142 }
 143 
 144 static void debug_force_cpu_powered_up(struct debug_drvdata *drvdata)
 145 {
 146         u32 edprcr;
 147 
 148 try_again:
 149 
 150         /*
 151          * Send request to power management controller and assert
 152          * DBGPWRUPREQ signal; if power management controller has
 153          * sane implementation, it should enable CPU power domain
 154          * in case CPU is in low power state.
 155          */
 156         edprcr = readl_relaxed(drvdata->base + EDPRCR);
 157         edprcr |= EDPRCR_COREPURQ;
 158         writel_relaxed(edprcr, drvdata->base + EDPRCR);
 159 
 160         /* Wait for CPU to be powered up (timeout~=32ms) */
 161         if (readx_poll_timeout_atomic(readl_relaxed, drvdata->base + EDPRSR,
 162                         drvdata->edprsr, (drvdata->edprsr & EDPRSR_PU),
 163                         DEBUG_WAIT_SLEEP, DEBUG_WAIT_TIMEOUT)) {
 164                 /*
 165                  * Unfortunately the CPU cannot be powered up, so return
 166                  * back and later has no permission to access other
 167                  * registers. For this case, should disable CPU low power
 168                  * states to ensure CPU power domain is enabled!
 169                  */
 170                 dev_err(drvdata->dev, "%s: power up request for CPU%d failed\n",
 171                         __func__, drvdata->cpu);
 172                 return;
 173         }
 174 
 175         /*
 176          * At this point the CPU is powered up, so set the no powerdown
 177          * request bit so we don't lose power and emulate power down.
 178          */
 179         edprcr = readl_relaxed(drvdata->base + EDPRCR);
 180         edprcr |= EDPRCR_COREPURQ | EDPRCR_CORENPDRQ;
 181         writel_relaxed(edprcr, drvdata->base + EDPRCR);
 182 
 183         drvdata->edprsr = readl_relaxed(drvdata->base + EDPRSR);
 184 
 185         /* The core power domain got switched off on use, try again */
 186         if (unlikely(!(drvdata->edprsr & EDPRSR_PU)))
 187                 goto try_again;
 188 }
 189 
 190 static void debug_read_regs(struct debug_drvdata *drvdata)
 191 {
 192         u32 save_edprcr;
 193 
 194         CS_UNLOCK(drvdata->base);
 195 
 196         /* Unlock os lock */
 197         debug_os_unlock(drvdata);
 198 
 199         /* Save EDPRCR register */
 200         save_edprcr = readl_relaxed(drvdata->base + EDPRCR);
 201 
 202         /*
 203          * Ensure CPU power domain is enabled to let registers
 204          * are accessiable.
 205          */
 206         debug_force_cpu_powered_up(drvdata);
 207 
 208         if (!debug_access_permitted(drvdata))
 209                 goto out;
 210 
 211         drvdata->edpcsr = readl_relaxed(drvdata->base + EDPCSR);
 212 
 213         /*
 214          * As described in ARM DDI 0487A.k, if the processing
 215          * element (PE) is in debug state, or sample-based
 216          * profiling is prohibited, EDPCSR reads as 0xFFFFFFFF;
 217          * EDCIDSR, EDVIDSR and EDPCSR_HI registers also become
 218          * UNKNOWN state. So directly bail out for this case.
 219          */
 220         if (drvdata->edpcsr == EDPCSR_PROHIBITED)
 221                 goto out;
 222 
 223         /*
 224          * A read of the EDPCSR normally has the side-effect of
 225          * indirectly writing to EDCIDSR, EDVIDSR and EDPCSR_HI;
 226          * at this point it's safe to read value from them.
 227          */
 228         if (IS_ENABLED(CONFIG_64BIT))
 229                 drvdata->edpcsr_hi = readl_relaxed(drvdata->base + EDPCSR_HI);
 230 
 231         if (drvdata->edcidsr_present)
 232                 drvdata->edcidsr = readl_relaxed(drvdata->base + EDCIDSR);
 233 
 234         if (drvdata->edvidsr_present)
 235                 drvdata->edvidsr = readl_relaxed(drvdata->base + EDVIDSR);
 236 
 237 out:
 238         /* Restore EDPRCR register */
 239         writel_relaxed(save_edprcr, drvdata->base + EDPRCR);
 240 
 241         CS_LOCK(drvdata->base);
 242 }
 243 
 244 #ifdef CONFIG_64BIT
 245 static unsigned long debug_adjust_pc(struct debug_drvdata *drvdata)
 246 {
 247         return (unsigned long)drvdata->edpcsr_hi << 32 |
 248                (unsigned long)drvdata->edpcsr;
 249 }
 250 #else
 251 static unsigned long debug_adjust_pc(struct debug_drvdata *drvdata)
 252 {
 253         unsigned long arm_inst_offset = 0, thumb_inst_offset = 0;
 254         unsigned long pc;
 255 
 256         pc = (unsigned long)drvdata->edpcsr;
 257 
 258         if (drvdata->pc_has_offset) {
 259                 arm_inst_offset = 8;
 260                 thumb_inst_offset = 4;
 261         }
 262 
 263         /* Handle thumb instruction */
 264         if (pc & EDPCSR_THUMB) {
 265                 pc = (pc & EDPCSR_THUMB_INST_MASK) - thumb_inst_offset;
 266                 return pc;
 267         }
 268 
 269         /*
 270          * Handle arm instruction offset, if the arm instruction
 271          * is not 4 byte alignment then it's possible the case
 272          * for implementation defined; keep original value for this
 273          * case and print info for notice.
 274          */
 275         if (pc & BIT(1))
 276                 dev_emerg(drvdata->dev,
 277                           "Instruction offset is implementation defined\n");
 278         else
 279                 pc = (pc & EDPCSR_ARM_INST_MASK) - arm_inst_offset;
 280 
 281         return pc;
 282 }
 283 #endif
 284 
 285 static void debug_dump_regs(struct debug_drvdata *drvdata)
 286 {
 287         struct device *dev = drvdata->dev;
 288         unsigned long pc;
 289 
 290         dev_emerg(dev, " EDPRSR:  %08x (Power:%s DLK:%s)\n",
 291                   drvdata->edprsr,
 292                   drvdata->edprsr & EDPRSR_PU ? "On" : "Off",
 293                   drvdata->edprsr & EDPRSR_DLK ? "Lock" : "Unlock");
 294 
 295         if (!debug_access_permitted(drvdata)) {
 296                 dev_emerg(dev, "No permission to access debug registers!\n");
 297                 return;
 298         }
 299 
 300         if (drvdata->edpcsr == EDPCSR_PROHIBITED) {
 301                 dev_emerg(dev, "CPU is in Debug state or profiling is prohibited!\n");
 302                 return;
 303         }
 304 
 305         pc = debug_adjust_pc(drvdata);
 306         dev_emerg(dev, " EDPCSR:  %pS\n", (void *)pc);
 307 
 308         if (drvdata->edcidsr_present)
 309                 dev_emerg(dev, " EDCIDSR: %08x\n", drvdata->edcidsr);
 310 
 311         if (drvdata->edvidsr_present)
 312                 dev_emerg(dev, " EDVIDSR: %08x (State:%s Mode:%s Width:%dbits VMID:%x)\n",
 313                           drvdata->edvidsr,
 314                           drvdata->edvidsr & EDVIDSR_NS ?
 315                           "Non-secure" : "Secure",
 316                           drvdata->edvidsr & EDVIDSR_E3 ? "EL3" :
 317                                 (drvdata->edvidsr & EDVIDSR_E2 ?
 318                                  "EL2" : "EL1/0"),
 319                           drvdata->edvidsr & EDVIDSR_HV ? 64 : 32,
 320                           drvdata->edvidsr & (u32)EDVIDSR_VMID);
 321 }
 322 
 323 static void debug_init_arch_data(void *info)
 324 {
 325         struct debug_drvdata *drvdata = info;
 326         u32 mode, pcsr_offset;
 327         u32 eddevid, eddevid1;
 328 
 329         CS_UNLOCK(drvdata->base);
 330 
 331         /* Read device info */
 332         eddevid  = readl_relaxed(drvdata->base + EDDEVID);
 333         eddevid1 = readl_relaxed(drvdata->base + EDDEVID1);
 334 
 335         CS_LOCK(drvdata->base);
 336 
 337         /* Parse implementation feature */
 338         mode = eddevid & EDDEVID_PCSAMPLE_MODE;
 339         pcsr_offset = eddevid1 & EDDEVID1_PCSR_OFFSET_MASK;
 340 
 341         drvdata->edpcsr_present  = false;
 342         drvdata->edcidsr_present = false;
 343         drvdata->edvidsr_present = false;
 344         drvdata->pc_has_offset   = false;
 345 
 346         switch (mode) {
 347         case EDDEVID_IMPL_FULL:
 348                 drvdata->edvidsr_present = true;
 349                 /* Fall through */
 350         case EDDEVID_IMPL_EDPCSR_EDCIDSR:
 351                 drvdata->edcidsr_present = true;
 352                 /* Fall through */
 353         case EDDEVID_IMPL_EDPCSR:
 354                 /*
 355                  * In ARM DDI 0487A.k, the EDDEVID1.PCSROffset is used to
 356                  * define if has the offset for PC sampling value; if read
 357                  * back EDDEVID1.PCSROffset == 0x2, then this means the debug
 358                  * module does not sample the instruction set state when
 359                  * armv8 CPU in AArch32 state.
 360                  */
 361                 drvdata->edpcsr_present =
 362                         ((IS_ENABLED(CONFIG_64BIT) && pcsr_offset != 0) ||
 363                          (pcsr_offset != EDDEVID1_PCSR_NO_OFFSET_DIS_AARCH32));
 364 
 365                 drvdata->pc_has_offset =
 366                         (pcsr_offset == EDDEVID1_PCSR_OFFSET_INS_SET);
 367                 break;
 368         default:
 369                 break;
 370         }
 371 }
 372 
 373 /*
 374  * Dump out information on panic.
 375  */
 376 static int debug_notifier_call(struct notifier_block *self,
 377                                unsigned long v, void *p)
 378 {
 379         int cpu;
 380         struct debug_drvdata *drvdata;
 381 
 382         mutex_lock(&debug_lock);
 383 
 384         /* Bail out if the functionality is disabled */
 385         if (!debug_enable)
 386                 goto skip_dump;
 387 
 388         pr_emerg("ARM external debug module:\n");
 389 
 390         for_each_possible_cpu(cpu) {
 391                 drvdata = per_cpu(debug_drvdata, cpu);
 392                 if (!drvdata)
 393                         continue;
 394 
 395                 dev_emerg(drvdata->dev, "CPU[%d]:\n", drvdata->cpu);
 396 
 397                 debug_read_regs(drvdata);
 398                 debug_dump_regs(drvdata);
 399         }
 400 
 401 skip_dump:
 402         mutex_unlock(&debug_lock);
 403         return 0;
 404 }
 405 
 406 static struct notifier_block debug_notifier = {
 407         .notifier_call = debug_notifier_call,
 408 };
 409 
 410 static int debug_enable_func(void)
 411 {
 412         struct debug_drvdata *drvdata;
 413         int cpu, ret = 0;
 414         cpumask_t mask;
 415 
 416         /*
 417          * Use cpumask to track which debug power domains have
 418          * been powered on and use it to handle failure case.
 419          */
 420         cpumask_clear(&mask);
 421 
 422         for_each_possible_cpu(cpu) {
 423                 drvdata = per_cpu(debug_drvdata, cpu);
 424                 if (!drvdata)
 425                         continue;
 426 
 427                 ret = pm_runtime_get_sync(drvdata->dev);
 428                 if (ret < 0)
 429                         goto err;
 430                 else
 431                         cpumask_set_cpu(cpu, &mask);
 432         }
 433 
 434         return 0;
 435 
 436 err:
 437         /*
 438          * If pm_runtime_get_sync() has failed, need rollback on
 439          * all the other CPUs that have been enabled before that.
 440          */
 441         for_each_cpu(cpu, &mask) {
 442                 drvdata = per_cpu(debug_drvdata, cpu);
 443                 pm_runtime_put_noidle(drvdata->dev);
 444         }
 445 
 446         return ret;
 447 }
 448 
 449 static int debug_disable_func(void)
 450 {
 451         struct debug_drvdata *drvdata;
 452         int cpu, ret, err = 0;
 453 
 454         /*
 455          * Disable debug power domains, records the error and keep
 456          * circling through all other CPUs when an error has been
 457          * encountered.
 458          */
 459         for_each_possible_cpu(cpu) {
 460                 drvdata = per_cpu(debug_drvdata, cpu);
 461                 if (!drvdata)
 462                         continue;
 463 
 464                 ret = pm_runtime_put(drvdata->dev);
 465                 if (ret < 0)
 466                         err = ret;
 467         }
 468 
 469         return err;
 470 }
 471 
 472 static ssize_t debug_func_knob_write(struct file *f,
 473                 const char __user *buf, size_t count, loff_t *ppos)
 474 {
 475         u8 val;
 476         int ret;
 477 
 478         ret = kstrtou8_from_user(buf, count, 2, &val);
 479         if (ret)
 480                 return ret;
 481 
 482         mutex_lock(&debug_lock);
 483 
 484         if (val == debug_enable)
 485                 goto out;
 486 
 487         if (val)
 488                 ret = debug_enable_func();
 489         else
 490                 ret = debug_disable_func();
 491 
 492         if (ret) {
 493                 pr_err("%s: unable to %s debug function: %d\n",
 494                        __func__, val ? "enable" : "disable", ret);
 495                 goto err;
 496         }
 497 
 498         debug_enable = val;
 499 out:
 500         ret = count;
 501 err:
 502         mutex_unlock(&debug_lock);
 503         return ret;
 504 }
 505 
 506 static ssize_t debug_func_knob_read(struct file *f,
 507                 char __user *ubuf, size_t count, loff_t *ppos)
 508 {
 509         ssize_t ret;
 510         char buf[3];
 511 
 512         mutex_lock(&debug_lock);
 513         snprintf(buf, sizeof(buf), "%d\n", debug_enable);
 514         mutex_unlock(&debug_lock);
 515 
 516         ret = simple_read_from_buffer(ubuf, count, ppos, buf, sizeof(buf));
 517         return ret;
 518 }
 519 
 520 static const struct file_operations debug_func_knob_fops = {
 521         .open   = simple_open,
 522         .read   = debug_func_knob_read,
 523         .write  = debug_func_knob_write,
 524 };
 525 
 526 static int debug_func_init(void)
 527 {
 528         int ret;
 529 
 530         /* Create debugfs node */
 531         debug_debugfs_dir = debugfs_create_dir("coresight_cpu_debug", NULL);
 532         debugfs_create_file("enable", 0644, debug_debugfs_dir, NULL,
 533                             &debug_func_knob_fops);
 534 
 535         /* Register function to be called for panic */
 536         ret = atomic_notifier_chain_register(&panic_notifier_list,
 537                                              &debug_notifier);
 538         if (ret) {
 539                 pr_err("%s: unable to register notifier: %d\n",
 540                        __func__, ret);
 541                 goto err;
 542         }
 543 
 544         return 0;
 545 
 546 err:
 547         debugfs_remove_recursive(debug_debugfs_dir);
 548         return ret;
 549 }
 550 
 551 static void debug_func_exit(void)
 552 {
 553         atomic_notifier_chain_unregister(&panic_notifier_list,
 554                                          &debug_notifier);
 555         debugfs_remove_recursive(debug_debugfs_dir);
 556 }
 557 
 558 static int debug_probe(struct amba_device *adev, const struct amba_id *id)
 559 {
 560         void __iomem *base;
 561         struct device *dev = &adev->dev;
 562         struct debug_drvdata *drvdata;
 563         struct resource *res = &adev->res;
 564         int ret;
 565 
 566         drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
 567         if (!drvdata)
 568                 return -ENOMEM;
 569 
 570         drvdata->cpu = coresight_get_cpu(dev);
 571         if (drvdata->cpu < 0)
 572                 return drvdata->cpu;
 573 
 574         if (per_cpu(debug_drvdata, drvdata->cpu)) {
 575                 dev_err(dev, "CPU%d drvdata has already been initialized\n",
 576                         drvdata->cpu);
 577                 return -EBUSY;
 578         }
 579 
 580         drvdata->dev = &adev->dev;
 581         amba_set_drvdata(adev, drvdata);
 582 
 583         /* Validity for the resource is already checked by the AMBA core */
 584         base = devm_ioremap_resource(dev, res);
 585         if (IS_ERR(base))
 586                 return PTR_ERR(base);
 587 
 588         drvdata->base = base;
 589 
 590         get_online_cpus();
 591         per_cpu(debug_drvdata, drvdata->cpu) = drvdata;
 592         ret = smp_call_function_single(drvdata->cpu, debug_init_arch_data,
 593                                        drvdata, 1);
 594         put_online_cpus();
 595 
 596         if (ret) {
 597                 dev_err(dev, "CPU%d debug arch init failed\n", drvdata->cpu);
 598                 goto err;
 599         }
 600 
 601         if (!drvdata->edpcsr_present) {
 602                 dev_err(dev, "CPU%d sample-based profiling isn't implemented\n",
 603                         drvdata->cpu);
 604                 ret = -ENXIO;
 605                 goto err;
 606         }
 607 
 608         if (!debug_count++) {
 609                 ret = debug_func_init();
 610                 if (ret)
 611                         goto err_func_init;
 612         }
 613 
 614         mutex_lock(&debug_lock);
 615         /* Turn off debug power domain if debugging is disabled */
 616         if (!debug_enable)
 617                 pm_runtime_put(dev);
 618         mutex_unlock(&debug_lock);
 619 
 620         dev_info(dev, "Coresight debug-CPU%d initialized\n", drvdata->cpu);
 621         return 0;
 622 
 623 err_func_init:
 624         debug_count--;
 625 err:
 626         per_cpu(debug_drvdata, drvdata->cpu) = NULL;
 627         return ret;
 628 }
 629 
 630 static int debug_remove(struct amba_device *adev)
 631 {
 632         struct device *dev = &adev->dev;
 633         struct debug_drvdata *drvdata = amba_get_drvdata(adev);
 634 
 635         per_cpu(debug_drvdata, drvdata->cpu) = NULL;
 636 
 637         mutex_lock(&debug_lock);
 638         /* Turn off debug power domain before rmmod the module */
 639         if (debug_enable)
 640                 pm_runtime_put(dev);
 641         mutex_unlock(&debug_lock);
 642 
 643         if (!--debug_count)
 644                 debug_func_exit();
 645 
 646         return 0;
 647 }
 648 
 649 static const struct amba_cs_uci_id uci_id_debug[] = {
 650         {
 651                 /*  CPU Debug UCI data */
 652                 .devarch        = 0x47706a15,
 653                 .devarch_mask   = 0xfff0ffff,
 654                 .devtype        = 0x00000015,
 655         }
 656 };
 657 
 658 static const struct amba_id debug_ids[] = {
 659         CS_AMBA_ID(0x000bbd03),                         /* Cortex-A53 */
 660         CS_AMBA_ID(0x000bbd07),                         /* Cortex-A57 */
 661         CS_AMBA_ID(0x000bbd08),                         /* Cortex-A72 */
 662         CS_AMBA_ID(0x000bbd09),                         /* Cortex-A73 */
 663         CS_AMBA_UCI_ID(0x000f0205, uci_id_debug),       /* Qualcomm Kryo */
 664         CS_AMBA_UCI_ID(0x000f0211, uci_id_debug),       /* Qualcomm Kryo */
 665         {},
 666 };
 667 
 668 static struct amba_driver debug_driver = {
 669         .drv = {
 670                 .name   = "coresight-cpu-debug",
 671                 .suppress_bind_attrs = true,
 672         },
 673         .probe          = debug_probe,
 674         .remove         = debug_remove,
 675         .id_table       = debug_ids,
 676 };
 677 
 678 module_amba_driver(debug_driver);
 679 
 680 MODULE_AUTHOR("Leo Yan <leo.yan@linaro.org>");
 681 MODULE_DESCRIPTION("ARM Coresight CPU Debug Driver");
 682 MODULE_LICENSE("GPL");