drivers/perf/arm_xscale_pmu.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * ARMv5 [xscale] Performance counter handling code.
   4  *
   5  * Copyright (C) 2010, ARM Ltd., Will Deacon <[email protected]>
   6  *
   7  * Based on the previous xscale OProfile code.
   8  *
   9  * There are two variants of the xscale PMU that we support:
  10  *      - xscale1pmu: 2 event counters and a cycle counter
  11  *      - xscale2pmu: 4 event counters and a cycle counter
  12  * The two variants share event definitions, but have different
  13  * PMU structures.
  14  */
  15
  16 #include <asm/cputype.h>
  17 #include <asm/irq_regs.h>
  18
  19 #include <linux/of.h>
  20 #include <linux/perf/arm_pmu.h>
  21 #include <linux/platform_device.h>
  22
  23 enum xscale_perf_types {
  24         XSCALE_PERFCTR_ICACHE_MISS              = 0x00,
  25         XSCALE_PERFCTR_ICACHE_NO_DELIVER        = 0x01,
  26         XSCALE_PERFCTR_DATA_STALL               = 0x02,
  27         XSCALE_PERFCTR_ITLB_MISS                = 0x03,
  28         XSCALE_PERFCTR_DTLB_MISS                = 0x04,
  29         XSCALE_PERFCTR_BRANCH                   = 0x05,
  30         XSCALE_PERFCTR_BRANCH_MISS              = 0x06,
  31         XSCALE_PERFCTR_INSTRUCTION              = 0x07,
  32         XSCALE_PERFCTR_DCACHE_FULL_STALL        = 0x08,
  33         XSCALE_PERFCTR_DCACHE_FULL_STALL_CONTIG = 0x09,
  34         XSCALE_PERFCTR_DCACHE_ACCESS            = 0x0A,
  35         XSCALE_PERFCTR_DCACHE_MISS              = 0x0B,
  36         XSCALE_PERFCTR_DCACHE_WRITE_BACK        = 0x0C,
  37         XSCALE_PERFCTR_PC_CHANGED               = 0x0D,
  38         XSCALE_PERFCTR_BCU_REQUEST              = 0x10,
  39         XSCALE_PERFCTR_BCU_FULL                 = 0x11,
  40         XSCALE_PERFCTR_BCU_DRAIN                = 0x12,
  41         XSCALE_PERFCTR_BCU_ECC_NO_ELOG          = 0x14,
  42         XSCALE_PERFCTR_BCU_1_BIT_ERR            = 0x15,
  43         XSCALE_PERFCTR_RMW                      = 0x16,
  44         /* XSCALE_PERFCTR_CCNT is not hardware defined */
  45         XSCALE_PERFCTR_CCNT                     = 0xFE,
  46         XSCALE_PERFCTR_UNUSED                   = 0xFF,
  47 };
  48
  49 enum xscale_counters {
  50         XSCALE_CYCLE_COUNTER    = 0,
  51         XSCALE_COUNTER0,
  52         XSCALE_COUNTER1,
  53         XSCALE_COUNTER2,
  54         XSCALE_COUNTER3,
  55 };
  56 #define XSCALE1_NUM_COUNTERS    3
  57 #define XSCALE2_NUM_COUNTERS    5
  58
  59 static const unsigned xscale_perf_map[PERF_COUNT_HW_MAX] = {
  60         PERF_MAP_ALL_UNSUPPORTED,
  61         [PERF_COUNT_HW_CPU_CYCLES]              = XSCALE_PERFCTR_CCNT,
  62         [PERF_COUNT_HW_INSTRUCTIONS]            = XSCALE_PERFCTR_INSTRUCTION,
  63         [PERF_COUNT_HW_BRANCH_INSTRUCTIONS]     = XSCALE_PERFCTR_BRANCH,
  64         [PERF_COUNT_HW_BRANCH_MISSES]           = XSCALE_PERFCTR_BRANCH_MISS,
  65         [PERF_COUNT_HW_STALLED_CYCLES_FRONTEND] = XSCALE_PERFCTR_ICACHE_NO_DELIVER,
  66 };
  67
  68 static const unsigned xscale_perf_cache_map[PERF_COUNT_HW_CACHE_MAX]
  69                                            [PERF_COUNT_HW_CACHE_OP_MAX]
  70                                            [PERF_COUNT_HW_CACHE_RESULT_MAX] = {
  71         PERF_CACHE_MAP_ALL_UNSUPPORTED,
  72
  73         [C(L1D)][C(OP_READ)][C(RESULT_ACCESS)]  = XSCALE_PERFCTR_DCACHE_ACCESS,
  74         [C(L1D)][C(OP_READ)][C(RESULT_MISS)]    = XSCALE_PERFCTR_DCACHE_MISS,
  75         [C(L1D)][C(OP_WRITE)][C(RESULT_ACCESS)] = XSCALE_PERFCTR_DCACHE_ACCESS,
  76         [C(L1D)][C(OP_WRITE)][C(RESULT_MISS)]   = XSCALE_PERFCTR_DCACHE_MISS,
  77
  78         [C(L1I)][C(OP_READ)][C(RESULT_MISS)]    = XSCALE_PERFCTR_ICACHE_MISS,
  79
  80         [C(DTLB)][C(OP_READ)][C(RESULT_MISS)]   = XSCALE_PERFCTR_DTLB_MISS,
  81         [C(DTLB)][C(OP_WRITE)][C(RESULT_MISS)]  = XSCALE_PERFCTR_DTLB_MISS,
  82
  83         [C(ITLB)][C(OP_READ)][C(RESULT_MISS)]   = XSCALE_PERFCTR_ITLB_MISS,
  84         [C(ITLB)][C(OP_WRITE)][C(RESULT_MISS)]  = XSCALE_PERFCTR_ITLB_MISS,
  85 };
  86
  87 #define XSCALE_PMU_ENABLE       0x001
  88 #define XSCALE_PMN_RESET        0x002
  89 #define XSCALE_CCNT_RESET       0x004
  90 #define XSCALE_PMU_RESET        (CCNT_RESET | PMN_RESET)
  91 #define XSCALE_PMU_CNT64        0x008
  92
  93 #define XSCALE1_OVERFLOWED_MASK 0x700
  94 #define XSCALE1_CCOUNT_OVERFLOW 0x400
  95 #define XSCALE1_COUNT0_OVERFLOW 0x100
  96 #define XSCALE1_COUNT1_OVERFLOW 0x200
  97 #define XSCALE1_CCOUNT_INT_EN   0x040
  98 #define XSCALE1_COUNT0_INT_EN   0x010
  99 #define XSCALE1_COUNT1_INT_EN   0x020
 100 #define XSCALE1_COUNT0_EVT_SHFT 12
 101 #define XSCALE1_COUNT0_EVT_MASK (0xff << XSCALE1_COUNT0_EVT_SHFT)
 102 #define XSCALE1_COUNT1_EVT_SHFT 20
 103 #define XSCALE1_COUNT1_EVT_MASK (0xff << XSCALE1_COUNT1_EVT_SHFT)
 104
 105 static inline u32
 106 xscale1pmu_read_pmnc(void)
 107 {
 108         u32 val;
 109         asm volatile("mrc p14, 0, %0, c0, c0, 0" : "=r" (val));
 110         return val;
 111 }
 112
 113 static inline void
 114 xscale1pmu_write_pmnc(u32 val)
 115 {
 116         /* upper 4bits and 7, 11 are write-as-0 */
 117         val &= 0xffff77f;
 118         asm volatile("mcr p14, 0, %0, c0, c0, 0" : : "r" (val));
 119 }
 120
 121 static inline int
 122 xscale1_pmnc_counter_has_overflowed(unsigned long pmnc,
 123                                         enum xscale_counters counter)
 124 {
 125         int ret = 0;
 126
 127         switch (counter) {
 128         case XSCALE_CYCLE_COUNTER:
 129                 ret = pmnc & XSCALE1_CCOUNT_OVERFLOW;
 130                 break;
 131         case XSCALE_COUNTER0:
 132                 ret = pmnc & XSCALE1_COUNT0_OVERFLOW;
 133                 break;
 134         case XSCALE_COUNTER1:
 135                 ret = pmnc & XSCALE1_COUNT1_OVERFLOW;
 136                 break;
 137         default:
 138                 WARN_ONCE(1, "invalid counter number (%d)\n", counter);
 139         }
 140
 141         return ret;
 142 }
 143
 144 static irqreturn_t
 145 xscale1pmu_handle_irq(struct arm_pmu *cpu_pmu)
 146 {
 147         unsigned long pmnc;
 148         struct perf_sample_data data;
 149         struct pmu_hw_events *cpuc = this_cpu_ptr(cpu_pmu->hw_events);
 150         struct pt_regs *regs;
 151         int idx;
 152
 153         /*
 154          * NOTE: there's an A stepping erratum that states if an overflow
 155          *       bit already exists and another occurs, the previous
 156          *       Overflow bit gets cleared. There's no workaround.
 157          *       Fixed in B stepping or later.
 158          */
 159         pmnc = xscale1pmu_read_pmnc();
 160
 161         /*
 162          * Write the value back to clear the overflow flags. Overflow
 163          * flags remain in pmnc for use below. We also disable the PMU
 164          * while we process the interrupt.
 165          */
 166         xscale1pmu_write_pmnc(pmnc & ~XSCALE_PMU_ENABLE);
 167
 168         if (!(pmnc & XSCALE1_OVERFLOWED_MASK))
 169                 return IRQ_NONE;
 170
 171         regs = get_irq_regs();
 172
 173         for_each_set_bit(idx, cpu_pmu->cntr_mask, XSCALE1_NUM_COUNTERS) {
 174                 struct perf_event *event = cpuc->events[idx];
 175                 struct hw_perf_event *hwc;
 176
 177                 if (!event)
 178                         continue;
 179
 180                 if (!xscale1_pmnc_counter_has_overflowed(pmnc, idx))
 181                         continue;
 182
 183                 hwc = &event->hw;
 184                 armpmu_event_update(event);
 185                 perf_sample_data_init(&data, 0, hwc->last_period);
 186                 if (!armpmu_event_set_period(event))
 187                         continue;
 188
 189                 if (perf_event_overflow(event, &data, regs))
 190                         cpu_pmu->disable(event);
 191         }
 192
 193         irq_work_run();
 194
 195         /*
 196          * Re-enable the PMU.
 197          */
 198         pmnc = xscale1pmu_read_pmnc() | XSCALE_PMU_ENABLE;
 199         xscale1pmu_write_pmnc(pmnc);
 200
 201         return IRQ_HANDLED;
 202 }
 203
 204 static void xscale1pmu_enable_event(struct perf_event *event)
 205 {
 206         unsigned long val, mask, evt;
 207         struct hw_perf_event *hwc = &event->hw;
 208         int idx = hwc->idx;
 209
 210         switch (idx) {
 211         case XSCALE_CYCLE_COUNTER:
 212                 mask = 0;
 213                 evt = XSCALE1_CCOUNT_INT_EN;
 214                 break;
 215         case XSCALE_COUNTER0:
 216                 mask = XSCALE1_COUNT0_EVT_MASK;
 217                 evt = (hwc->config_base << XSCALE1_COUNT0_EVT_SHFT) |
 218                         XSCALE1_COUNT0_INT_EN;
 219                 break;
 220         case XSCALE_COUNTER1:
 221                 mask = XSCALE1_COUNT1_EVT_MASK;
 222                 evt = (hwc->config_base << XSCALE1_COUNT1_EVT_SHFT) |
 223                         XSCALE1_COUNT1_INT_EN;
 224                 break;
 225         default:
 226                 WARN_ONCE(1, "invalid counter number (%d)\n", idx);
 227                 return;
 228         }
 229
 230         val = xscale1pmu_read_pmnc();
 231         val &= ~mask;
 232         val |= evt;
 233         xscale1pmu_write_pmnc(val);
 234 }
 235
 236 static void xscale1pmu_disable_event(struct perf_event *event)
 237 {
 238         unsigned long val, mask, evt;
 239         struct hw_perf_event *hwc = &event->hw;
 240         int idx = hwc->idx;
 241
 242         switch (idx) {
 243         case XSCALE_CYCLE_COUNTER:
 244                 mask = XSCALE1_CCOUNT_INT_EN;
 245                 evt = 0;
 246                 break;
 247         case XSCALE_COUNTER0:
 248                 mask = XSCALE1_COUNT0_INT_EN | XSCALE1_COUNT0_EVT_MASK;
 249                 evt = XSCALE_PERFCTR_UNUSED << XSCALE1_COUNT0_EVT_SHFT;
 250                 break;
 251         case XSCALE_COUNTER1:
 252                 mask = XSCALE1_COUNT1_INT_EN | XSCALE1_COUNT1_EVT_MASK;
 253                 evt = XSCALE_PERFCTR_UNUSED << XSCALE1_COUNT1_EVT_SHFT;
 254                 break;
 255         default:
 256                 WARN_ONCE(1, "invalid counter number (%d)\n", idx);
 257                 return;
 258         }
 259
 260         val = xscale1pmu_read_pmnc();
 261         val &= ~mask;
 262         val |= evt;
 263         xscale1pmu_write_pmnc(val);
 264 }
 265
 266 static int
 267 xscale1pmu_get_event_idx(struct pmu_hw_events *cpuc,
 268                                 struct perf_event *event)
 269 {
 270         struct hw_perf_event *hwc = &event->hw;
 271         if (XSCALE_PERFCTR_CCNT == hwc->config_base) {
 272                 if (test_and_set_bit(XSCALE_CYCLE_COUNTER, cpuc->used_mask))
 273                         return -EAGAIN;
 274
 275                 return XSCALE_CYCLE_COUNTER;
 276         } else {
 277                 if (!test_and_set_bit(XSCALE_COUNTER1, cpuc->used_mask))
 278                         return XSCALE_COUNTER1;
 279
 280                 if (!test_and_set_bit(XSCALE_COUNTER0, cpuc->used_mask))
 281                         return XSCALE_COUNTER0;
 282
 283                 return -EAGAIN;
 284         }
 285 }
 286
 287 static void xscalepmu_clear_event_idx(struct pmu_hw_events *cpuc,
 288                                      struct perf_event *event)
 289 {
 290         clear_bit(event->hw.idx, cpuc->used_mask);
 291 }
 292
 293 static void xscale1pmu_start(struct arm_pmu *cpu_pmu)
 294 {
 295         unsigned long val;
 296
 297         val = xscale1pmu_read_pmnc();
 298         val |= XSCALE_PMU_ENABLE;
 299         xscale1pmu_write_pmnc(val);
 300 }
 301
 302 static void xscale1pmu_stop(struct arm_pmu *cpu_pmu)
 303 {
 304         unsigned long val;
 305
 306         val = xscale1pmu_read_pmnc();
 307         val &= ~XSCALE_PMU_ENABLE;
 308         xscale1pmu_write_pmnc(val);
 309 }
 310
 311 static inline u64 xscale1pmu_read_counter(struct perf_event *event)
 312 {
 313         struct hw_perf_event *hwc = &event->hw;
 314         int counter = hwc->idx;
 315         u32 val = 0;
 316
 317         switch (counter) {
 318         case XSCALE_CYCLE_COUNTER:
 319                 asm volatile("mrc p14, 0, %0, c1, c0, 0" : "=r" (val));
 320                 break;
 321         case XSCALE_COUNTER0:
 322                 asm volatile("mrc p14, 0, %0, c2, c0, 0" : "=r" (val));
 323                 break;
 324         case XSCALE_COUNTER1:
 325                 asm volatile("mrc p14, 0, %0, c3, c0, 0" : "=r" (val));
 326                 break;
 327         }
 328
 329         return val;
 330 }
 331
 332 static inline void xscale1pmu_write_counter(struct perf_event *event, u64 val)
 333 {
 334         struct hw_perf_event *hwc = &event->hw;
 335         int counter = hwc->idx;
 336
 337         switch (counter) {
 338         case XSCALE_CYCLE_COUNTER:
 339                 asm volatile("mcr p14, 0, %0, c1, c0, 0" : : "r" (val));
 340                 break;
 341         case XSCALE_COUNTER0:
 342                 asm volatile("mcr p14, 0, %0, c2, c0, 0" : : "r" (val));
 343                 break;
 344         case XSCALE_COUNTER1:
 345                 asm volatile("mcr p14, 0, %0, c3, c0, 0" : : "r" (val));
 346                 break;
 347         }
 348 }
 349
 350 static int xscale_map_event(struct perf_event *event)
 351 {
 352         return armpmu_map_event(event, &xscale_perf_map,
 353                                 &xscale_perf_cache_map, 0xFF);
 354 }
 355
 356 static int xscale1pmu_init(struct arm_pmu *cpu_pmu)
 357 {
 358         cpu_pmu->name           = "armv5_xscale1";
 359         cpu_pmu->handle_irq     = xscale1pmu_handle_irq;
 360         cpu_pmu->enable         = xscale1pmu_enable_event;
 361         cpu_pmu->disable        = xscale1pmu_disable_event;
 362         cpu_pmu->read_counter   = xscale1pmu_read_counter;
 363         cpu_pmu->write_counter  = xscale1pmu_write_counter;
 364         cpu_pmu->get_event_idx  = xscale1pmu_get_event_idx;
 365         cpu_pmu->clear_event_idx = xscalepmu_clear_event_idx;
 366         cpu_pmu->start          = xscale1pmu_start;
 367         cpu_pmu->stop           = xscale1pmu_stop;
 368         cpu_pmu->map_event      = xscale_map_event;
 369
 370         bitmap_set(cpu_pmu->cntr_mask, 0, XSCALE1_NUM_COUNTERS);
 371
 372         return 0;
 373 }
 374
 375 #define XSCALE2_OVERFLOWED_MASK 0x01f
 376 #define XSCALE2_CCOUNT_OVERFLOW 0x001
 377 #define XSCALE2_COUNT0_OVERFLOW 0x002
 378 #define XSCALE2_COUNT1_OVERFLOW 0x004
 379 #define XSCALE2_COUNT2_OVERFLOW 0x008
 380 #define XSCALE2_COUNT3_OVERFLOW 0x010
 381 #define XSCALE2_CCOUNT_INT_EN   0x001
 382 #define XSCALE2_COUNT0_INT_EN   0x002
 383 #define XSCALE2_COUNT1_INT_EN   0x004
 384 #define XSCALE2_COUNT2_INT_EN   0x008
 385 #define XSCALE2_COUNT3_INT_EN   0x010
 386 #define XSCALE2_COUNT0_EVT_SHFT 0
 387 #define XSCALE2_COUNT0_EVT_MASK (0xff << XSCALE2_COUNT0_EVT_SHFT)
 388 #define XSCALE2_COUNT1_EVT_SHFT 8
 389 #define XSCALE2_COUNT1_EVT_MASK (0xff << XSCALE2_COUNT1_EVT_SHFT)
 390 #define XSCALE2_COUNT2_EVT_SHFT 16
 391 #define XSCALE2_COUNT2_EVT_MASK (0xff << XSCALE2_COUNT2_EVT_SHFT)
 392 #define XSCALE2_COUNT3_EVT_SHFT 24
 393 #define XSCALE2_COUNT3_EVT_MASK (0xff << XSCALE2_COUNT3_EVT_SHFT)
 394
 395 static inline u32
 396 xscale2pmu_read_pmnc(void)
 397 {
 398         u32 val;
 399         asm volatile("mrc p14, 0, %0, c0, c1, 0" : "=r" (val));
 400         /* bits 1-2 and 4-23 are read-unpredictable */
 401         return val & 0xff000009;
 402 }
 403
 404 static inline void
 405 xscale2pmu_write_pmnc(u32 val)
 406 {
 407         /* bits 4-23 are write-as-0, 24-31 are write ignored */
 408         val &= 0xf;
 409         asm volatile("mcr p14, 0, %0, c0, c1, 0" : : "r" (val));
 410 }
 411
 412 static inline u32
 413 xscale2pmu_read_overflow_flags(void)
 414 {
 415         u32 val;
 416         asm volatile("mrc p14, 0, %0, c5, c1, 0" : "=r" (val));
 417         return val;
 418 }
 419
 420 static inline void
 421 xscale2pmu_write_overflow_flags(u32 val)
 422 {
 423         asm volatile("mcr p14, 0, %0, c5, c1, 0" : : "r" (val));
 424 }
 425
 426 static inline u32
 427 xscale2pmu_read_event_select(void)
 428 {
 429         u32 val;
 430         asm volatile("mrc p14, 0, %0, c8, c1, 0" : "=r" (val));
 431         return val;
 432 }
 433
 434 static inline void
 435 xscale2pmu_write_event_select(u32 val)
 436 {
 437         asm volatile("mcr p14, 0, %0, c8, c1, 0" : : "r"(val));
 438 }
 439
 440 static inline u32
 441 xscale2pmu_read_int_enable(void)
 442 {
 443         u32 val;
 444         asm volatile("mrc p14, 0, %0, c4, c1, 0" : "=r" (val));
 445         return val;
 446 }
 447
 448 static void
 449 xscale2pmu_write_int_enable(u32 val)
 450 {
 451         asm volatile("mcr p14, 0, %0, c4, c1, 0" : : "r" (val));
 452 }
 453
 454 static inline int
 455 xscale2_pmnc_counter_has_overflowed(unsigned long of_flags,
 456                                         enum xscale_counters counter)
 457 {
 458         int ret = 0;
 459
 460         switch (counter) {
 461         case XSCALE_CYCLE_COUNTER:
 462                 ret = of_flags & XSCALE2_CCOUNT_OVERFLOW;
 463                 break;
 464         case XSCALE_COUNTER0:
 465                 ret = of_flags & XSCALE2_COUNT0_OVERFLOW;
 466                 break;
 467         case XSCALE_COUNTER1:
 468                 ret = of_flags & XSCALE2_COUNT1_OVERFLOW;
 469                 break;
 470         case XSCALE_COUNTER2:
 471                 ret = of_flags & XSCALE2_COUNT2_OVERFLOW;
 472                 break;
 473         case XSCALE_COUNTER3:
 474                 ret = of_flags & XSCALE2_COUNT3_OVERFLOW;
 475                 break;
 476         default:
 477                 WARN_ONCE(1, "invalid counter number (%d)\n", counter);
 478         }
 479
 480         return ret;
 481 }
 482
 483 static irqreturn_t
 484 xscale2pmu_handle_irq(struct arm_pmu *cpu_pmu)
 485 {
 486         unsigned long pmnc, of_flags;
 487         struct perf_sample_data data;
 488         struct pmu_hw_events *cpuc = this_cpu_ptr(cpu_pmu->hw_events);
 489         struct pt_regs *regs;
 490         int idx;
 491
 492         /* Disable the PMU. */
 493         pmnc = xscale2pmu_read_pmnc();
 494         xscale2pmu_write_pmnc(pmnc & ~XSCALE_PMU_ENABLE);
 495
 496         /* Check the overflow flag register. */
 497         of_flags = xscale2pmu_read_overflow_flags();
 498         if (!(of_flags & XSCALE2_OVERFLOWED_MASK))
 499                 return IRQ_NONE;
 500
 501         /* Clear the overflow bits. */
 502         xscale2pmu_write_overflow_flags(of_flags);
 503
 504         regs = get_irq_regs();
 505
 506         for_each_set_bit(idx, cpu_pmu->cntr_mask, XSCALE2_NUM_COUNTERS) {
 507                 struct perf_event *event = cpuc->events[idx];
 508                 struct hw_perf_event *hwc;
 509
 510                 if (!event)
 511                         continue;
 512
 513                 if (!xscale2_pmnc_counter_has_overflowed(of_flags, idx))
 514                         continue;
 515
 516                 hwc = &event->hw;
 517                 armpmu_event_update(event);
 518                 perf_sample_data_init(&data, 0, hwc->last_period);
 519                 if (!armpmu_event_set_period(event))
 520                         continue;
 521
 522                 if (perf_event_overflow(event, &data, regs))
 523                         cpu_pmu->disable(event);
 524         }
 525
 526         irq_work_run();
 527
 528         /*
 529          * Re-enable the PMU.
 530          */
 531         pmnc = xscale2pmu_read_pmnc() | XSCALE_PMU_ENABLE;
 532         xscale2pmu_write_pmnc(pmnc);
 533
 534         return IRQ_HANDLED;
 535 }
 536
 537 static void xscale2pmu_enable_event(struct perf_event *event)
 538 {
 539         unsigned long ien, evtsel;
 540         struct hw_perf_event *hwc = &event->hw;
 541         int idx = hwc->idx;
 542
 543         ien = xscale2pmu_read_int_enable();
 544         evtsel = xscale2pmu_read_event_select();
 545
 546         switch (idx) {
 547         case XSCALE_CYCLE_COUNTER:
 548                 ien |= XSCALE2_CCOUNT_INT_EN;
 549                 break;
 550         case XSCALE_COUNTER0:
 551                 ien |= XSCALE2_COUNT0_INT_EN;
 552                 evtsel &= ~XSCALE2_COUNT0_EVT_MASK;
 553                 evtsel |= hwc->config_base << XSCALE2_COUNT0_EVT_SHFT;
 554                 break;
 555         case XSCALE_COUNTER1:
 556                 ien |= XSCALE2_COUNT1_INT_EN;
 557                 evtsel &= ~XSCALE2_COUNT1_EVT_MASK;
 558                 evtsel |= hwc->config_base << XSCALE2_COUNT1_EVT_SHFT;
 559                 break;
 560         case XSCALE_COUNTER2:
 561                 ien |= XSCALE2_COUNT2_INT_EN;
 562                 evtsel &= ~XSCALE2_COUNT2_EVT_MASK;
 563                 evtsel |= hwc->config_base << XSCALE2_COUNT2_EVT_SHFT;
 564                 break;
 565         case XSCALE_COUNTER3:
 566                 ien |= XSCALE2_COUNT3_INT_EN;
 567                 evtsel &= ~XSCALE2_COUNT3_EVT_MASK;
 568                 evtsel |= hwc->config_base << XSCALE2_COUNT3_EVT_SHFT;
 569                 break;
 570         default:
 571                 WARN_ONCE(1, "invalid counter number (%d)\n", idx);
 572                 return;
 573         }
 574
 575         xscale2pmu_write_event_select(evtsel);
 576         xscale2pmu_write_int_enable(ien);
 577 }
 578
 579 static void xscale2pmu_disable_event(struct perf_event *event)
 580 {
 581         unsigned long ien, evtsel, of_flags;
 582         struct hw_perf_event *hwc = &event->hw;
 583         int idx = hwc->idx;
 584
 585         ien = xscale2pmu_read_int_enable();
 586         evtsel = xscale2pmu_read_event_select();
 587
 588         switch (idx) {
 589         case XSCALE_CYCLE_COUNTER:
 590                 ien &= ~XSCALE2_CCOUNT_INT_EN;
 591                 of_flags = XSCALE2_CCOUNT_OVERFLOW;
 592                 break;
 593         case XSCALE_COUNTER0:
 594                 ien &= ~XSCALE2_COUNT0_INT_EN;
 595                 evtsel &= ~XSCALE2_COUNT0_EVT_MASK;
 596                 evtsel |= XSCALE_PERFCTR_UNUSED << XSCALE2_COUNT0_EVT_SHFT;
 597                 of_flags = XSCALE2_COUNT0_OVERFLOW;
 598                 break;
 599         case XSCALE_COUNTER1:
 600                 ien &= ~XSCALE2_COUNT1_INT_EN;
 601                 evtsel &= ~XSCALE2_COUNT1_EVT_MASK;
 602                 evtsel |= XSCALE_PERFCTR_UNUSED << XSCALE2_COUNT1_EVT_SHFT;
 603                 of_flags = XSCALE2_COUNT1_OVERFLOW;
 604                 break;
 605         case XSCALE_COUNTER2:
 606                 ien &= ~XSCALE2_COUNT2_INT_EN;
 607                 evtsel &= ~XSCALE2_COUNT2_EVT_MASK;
 608                 evtsel |= XSCALE_PERFCTR_UNUSED << XSCALE2_COUNT2_EVT_SHFT;
 609                 of_flags = XSCALE2_COUNT2_OVERFLOW;
 610                 break;
 611         case XSCALE_COUNTER3:
 612                 ien &= ~XSCALE2_COUNT3_INT_EN;
 613                 evtsel &= ~XSCALE2_COUNT3_EVT_MASK;
 614                 evtsel |= XSCALE_PERFCTR_UNUSED << XSCALE2_COUNT3_EVT_SHFT;
 615                 of_flags = XSCALE2_COUNT3_OVERFLOW;
 616                 break;
 617         default:
 618                 WARN_ONCE(1, "invalid counter number (%d)\n", idx);
 619                 return;
 620         }
 621
 622         xscale2pmu_write_event_select(evtsel);
 623         xscale2pmu_write_int_enable(ien);
 624         xscale2pmu_write_overflow_flags(of_flags);
 625 }
 626
 627 static int
 628 xscale2pmu_get_event_idx(struct pmu_hw_events *cpuc,
 629                                 struct perf_event *event)
 630 {
 631         int idx = xscale1pmu_get_event_idx(cpuc, event);
 632         if (idx >= 0)
 633                 goto out;
 634
 635         if (!test_and_set_bit(XSCALE_COUNTER3, cpuc->used_mask))
 636                 idx = XSCALE_COUNTER3;
 637         else if (!test_and_set_bit(XSCALE_COUNTER2, cpuc->used_mask))
 638                 idx = XSCALE_COUNTER2;
 639 out:
 640         return idx;
 641 }
 642
 643 static void xscale2pmu_start(struct arm_pmu *cpu_pmu)
 644 {
 645         unsigned long val;
 646
 647         val = xscale2pmu_read_pmnc() & ~XSCALE_PMU_CNT64;
 648         val |= XSCALE_PMU_ENABLE;
 649         xscale2pmu_write_pmnc(val);
 650 }
 651
 652 static void xscale2pmu_stop(struct arm_pmu *cpu_pmu)
 653 {
 654         unsigned long val;
 655
 656         val = xscale2pmu_read_pmnc();
 657         val &= ~XSCALE_PMU_ENABLE;
 658         xscale2pmu_write_pmnc(val);
 659 }
 660
 661 static inline u64 xscale2pmu_read_counter(struct perf_event *event)
 662 {
 663         struct hw_perf_event *hwc = &event->hw;
 664         int counter = hwc->idx;
 665         u32 val = 0;
 666
 667         switch (counter) {
 668         case XSCALE_CYCLE_COUNTER:
 669                 asm volatile("mrc p14, 0, %0, c1, c1, 0" : "=r" (val));
 670                 break;
 671         case XSCALE_COUNTER0:
 672                 asm volatile("mrc p14, 0, %0, c0, c2, 0" : "=r" (val));
 673                 break;
 674         case XSCALE_COUNTER1:
 675                 asm volatile("mrc p14, 0, %0, c1, c2, 0" : "=r" (val));
 676                 break;
 677         case XSCALE_COUNTER2:
 678                 asm volatile("mrc p14, 0, %0, c2, c2, 0" : "=r" (val));
 679                 break;
 680         case XSCALE_COUNTER3:
 681                 asm volatile("mrc p14, 0, %0, c3, c2, 0" : "=r" (val));
 682                 break;
 683         }
 684
 685         return val;
 686 }
 687
 688 static inline void xscale2pmu_write_counter(struct perf_event *event, u64 val)
 689 {
 690         struct hw_perf_event *hwc = &event->hw;
 691         int counter = hwc->idx;
 692
 693         switch (counter) {
 694         case XSCALE_CYCLE_COUNTER:
 695                 asm volatile("mcr p14, 0, %0, c1, c1, 0" : : "r" (val));
 696                 break;
 697         case XSCALE_COUNTER0:
 698                 asm volatile("mcr p14, 0, %0, c0, c2, 0" : : "r" (val));
 699                 break;
 700         case XSCALE_COUNTER1:
 701                 asm volatile("mcr p14, 0, %0, c1, c2, 0" : : "r" (val));
 702                 break;
 703         case XSCALE_COUNTER2:
 704                 asm volatile("mcr p14, 0, %0, c2, c2, 0" : : "r" (val));
 705                 break;
 706         case XSCALE_COUNTER3:
 707                 asm volatile("mcr p14, 0, %0, c3, c2, 0" : : "r" (val));
 708                 break;
 709         }
 710 }
 711
 712 static int xscale2pmu_init(struct arm_pmu *cpu_pmu)
 713 {
 714         cpu_pmu->name           = "armv5_xscale2";
 715         cpu_pmu->handle_irq     = xscale2pmu_handle_irq;
 716         cpu_pmu->enable         = xscale2pmu_enable_event;
 717         cpu_pmu->disable        = xscale2pmu_disable_event;
 718         cpu_pmu->read_counter   = xscale2pmu_read_counter;
 719         cpu_pmu->write_counter  = xscale2pmu_write_counter;
 720         cpu_pmu->get_event_idx  = xscale2pmu_get_event_idx;
 721         cpu_pmu->clear_event_idx = xscalepmu_clear_event_idx;
 722         cpu_pmu->start          = xscale2pmu_start;
 723         cpu_pmu->stop           = xscale2pmu_stop;
 724         cpu_pmu->map_event      = xscale_map_event;
 725
 726         bitmap_set(cpu_pmu->cntr_mask, 0, XSCALE2_NUM_COUNTERS);
 727
 728         return 0;
 729 }
 730
 731 static const struct pmu_probe_info xscale_pmu_probe_table[] = {
 732         XSCALE_PMU_PROBE(ARM_CPU_XSCALE_ARCH_V1, xscale1pmu_init),
 733         XSCALE_PMU_PROBE(ARM_CPU_XSCALE_ARCH_V2, xscale2pmu_init),
 734         { /* sentinel value */ }
 735 };
 736
 737 static int xscale_pmu_device_probe(struct platform_device *pdev)
 738 {
 739         return arm_pmu_device_probe(pdev, NULL, xscale_pmu_probe_table);
 740 }
 741
 742 static struct platform_driver xscale_pmu_driver = {
 743         .driver         = {
 744                 .name   = "xscale-pmu",
 745         },
 746         .probe          = xscale_pmu_device_probe,
 747 };
 748
 749 builtin_platform_driver(xscale_pmu_driver);