drivers/clocksource/exynos_mct.c

   1 /* linux/arch/arm/mach-exynos4/mct.c
   2  *
   3  * Copyright (c) 2011 Samsung Electronics Co., Ltd.
   4  *              http://www.samsung.com
   5  *
   6  * EXYNOS4 MCT(Multi-Core Timer) support
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11 */
  12
  13 #include <linux/sched.h>
  14 #include <linux/interrupt.h>
  15 #include <linux/irq.h>
  16 #include <linux/err.h>
  17 #include <linux/clk.h>
  18 #include <linux/clockchips.h>
  19 #include <linux/cpu.h>
  20 #include <linux/platform_device.h>
  21 #include <linux/delay.h>
  22 #include <linux/percpu.h>
  23 #include <linux/of.h>
  24 #include <linux/of_irq.h>
  25 #include <linux/of_address.h>
  26 #include <linux/clocksource.h>
  27 #include <linux/sched_clock.h>
  28
  29 #define EXYNOS4_MCTREG(x)               (x)
  30 #define EXYNOS4_MCT_G_CNT_L             EXYNOS4_MCTREG(0x100)
  31 #define EXYNOS4_MCT_G_CNT_U             EXYNOS4_MCTREG(0x104)
  32 #define EXYNOS4_MCT_G_CNT_WSTAT         EXYNOS4_MCTREG(0x110)
  33 #define EXYNOS4_MCT_G_COMP0_L           EXYNOS4_MCTREG(0x200)
  34 #define EXYNOS4_MCT_G_COMP0_U           EXYNOS4_MCTREG(0x204)
  35 #define EXYNOS4_MCT_G_COMP0_ADD_INCR    EXYNOS4_MCTREG(0x208)
  36 #define EXYNOS4_MCT_G_TCON              EXYNOS4_MCTREG(0x240)
  37 #define EXYNOS4_MCT_G_INT_CSTAT         EXYNOS4_MCTREG(0x244)
  38 #define EXYNOS4_MCT_G_INT_ENB           EXYNOS4_MCTREG(0x248)
  39 #define EXYNOS4_MCT_G_WSTAT             EXYNOS4_MCTREG(0x24C)
  40 #define _EXYNOS4_MCT_L_BASE             EXYNOS4_MCTREG(0x300)
  41 #define EXYNOS4_MCT_L_BASE(x)           (_EXYNOS4_MCT_L_BASE + (0x100 * x))
  42 #define EXYNOS4_MCT_L_MASK              (0xffffff00)
  43
  44 #define MCT_L_TCNTB_OFFSET              (0x00)
  45 #define MCT_L_ICNTB_OFFSET              (0x08)
  46 #define MCT_L_TCON_OFFSET               (0x20)
  47 #define MCT_L_INT_CSTAT_OFFSET          (0x30)
  48 #define MCT_L_INT_ENB_OFFSET            (0x34)
  49 #define MCT_L_WSTAT_OFFSET              (0x40)
  50 #define MCT_G_TCON_START                (1 << 8)
  51 #define MCT_G_TCON_COMP0_AUTO_INC       (1 << 1)
  52 #define MCT_G_TCON_COMP0_ENABLE         (1 << 0)
  53 #define MCT_L_TCON_INTERVAL_MODE        (1 << 2)
  54 #define MCT_L_TCON_INT_START            (1 << 1)
  55 #define MCT_L_TCON_TIMER_START          (1 << 0)
  56
  57 #define TICK_BASE_CNT   1
  58
  59 enum {
  60         MCT_INT_SPI,
  61         MCT_INT_PPI
  62 };
  63
  64 enum {
  65         MCT_G0_IRQ,
  66         MCT_G1_IRQ,
  67         MCT_G2_IRQ,
  68         MCT_G3_IRQ,
  69         MCT_L0_IRQ,
  70         MCT_L1_IRQ,
  71         MCT_L2_IRQ,
  72         MCT_L3_IRQ,
  73         MCT_L4_IRQ,
  74         MCT_L5_IRQ,
  75         MCT_L6_IRQ,
  76         MCT_L7_IRQ,
  77         MCT_NR_IRQS,
  78 };
  79
  80 static void __iomem *reg_base;
  81 static unsigned long clk_rate;
  82 static unsigned int mct_int_type;
  83 static int mct_irqs[MCT_NR_IRQS];
  84
  85 struct mct_clock_event_device {
  86         struct clock_event_device evt;
  87         unsigned long base;
  88         char name[10];
  89 };
  90
  91 static void exynos4_mct_write(unsigned int value, unsigned long offset)
  92 {
  93         unsigned long stat_addr;
  94         u32 mask;
  95         u32 i;
  96
  97         writel_relaxed(value, reg_base + offset);
  98
  99         if (likely(offset >= EXYNOS4_MCT_L_BASE(0))) {
 100                 stat_addr = (offset & ~EXYNOS4_MCT_L_MASK) + MCT_L_WSTAT_OFFSET;
 101                 switch (offset & EXYNOS4_MCT_L_MASK) {
 102                 case MCT_L_TCON_OFFSET:
 103                         mask = 1 << 3;          /* L_TCON write status */
 104                         break;
 105                 case MCT_L_ICNTB_OFFSET:
 106                         mask = 1 << 1;          /* L_ICNTB write status */
 107                         break;
 108                 case MCT_L_TCNTB_OFFSET:
 109                         mask = 1 << 0;          /* L_TCNTB write status */
 110                         break;
 111                 default:
 112                         return;
 113                 }
 114         } else {
 115                 switch (offset) {
 116                 case EXYNOS4_MCT_G_TCON:
 117                         stat_addr = EXYNOS4_MCT_G_WSTAT;
 118                         mask = 1 << 16;         /* G_TCON write status */
 119                         break;
 120                 case EXYNOS4_MCT_G_COMP0_L:
 121                         stat_addr = EXYNOS4_MCT_G_WSTAT;
 122                         mask = 1 << 0;          /* G_COMP0_L write status */
 123                         break;
 124                 case EXYNOS4_MCT_G_COMP0_U:
 125                         stat_addr = EXYNOS4_MCT_G_WSTAT;
 126                         mask = 1 << 1;          /* G_COMP0_U write status */
 127                         break;
 128                 case EXYNOS4_MCT_G_COMP0_ADD_INCR:
 129                         stat_addr = EXYNOS4_MCT_G_WSTAT;
 130                         mask = 1 << 2;          /* G_COMP0_ADD_INCR w status */
 131                         break;
 132                 case EXYNOS4_MCT_G_CNT_L:
 133                         stat_addr = EXYNOS4_MCT_G_CNT_WSTAT;
 134                         mask = 1 << 0;          /* G_CNT_L write status */
 135                         break;
 136                 case EXYNOS4_MCT_G_CNT_U:
 137                         stat_addr = EXYNOS4_MCT_G_CNT_WSTAT;
 138                         mask = 1 << 1;          /* G_CNT_U write status */
 139                         break;
 140                 default:
 141                         return;
 142                 }
 143         }
 144
 145         /* Wait maximum 1 ms until written values are applied */
 146         for (i = 0; i < loops_per_jiffy / 1000 * HZ; i++)
 147                 if (readl_relaxed(reg_base + stat_addr) & mask) {
 148                         writel_relaxed(mask, reg_base + stat_addr);
 149                         return;
 150                 }
 151
 152         panic("MCT hangs after writing %d (offset:0x%lx)\n", value, offset);
 153 }
 154
 155 /* Clocksource handling */
 156 static void exynos4_mct_frc_start(void)
 157 {
 158         u32 reg;
 159
 160         reg = readl_relaxed(reg_base + EXYNOS4_MCT_G_TCON);
 161         reg |= MCT_G_TCON_START;
 162         exynos4_mct_write(reg, EXYNOS4_MCT_G_TCON);
 163 }
 164
 165 /**
 166  * exynos4_read_count_64 - Read all 64-bits of the global counter
 167  *
 168  * This will read all 64-bits of the global counter taking care to make sure
 169  * that the upper and lower half match.  Note that reading the MCT can be quite
 170  * slow (hundreds of nanoseconds) so you should use the 32-bit (lower half
 171  * only) version when possible.
 172  *
 173  * Returns the number of cycles in the global counter.
 174  */
 175 static u64 exynos4_read_count_64(void)
 176 {
 177         unsigned int lo, hi;
 178         u32 hi2 = readl_relaxed(reg_base + EXYNOS4_MCT_G_CNT_U);
 179
 180         do {
 181                 hi = hi2;
 182                 lo = readl_relaxed(reg_base + EXYNOS4_MCT_G_CNT_L);
 183                 hi2 = readl_relaxed(reg_base + EXYNOS4_MCT_G_CNT_U);
 184         } while (hi != hi2);
 185
 186         return ((cycle_t)hi << 32) | lo;
 187 }
 188
 189 /**
 190  * exynos4_read_count_32 - Read the lower 32-bits of the global counter
 191  *
 192  * This will read just the lower 32-bits of the global counter.  This is marked
 193  * as notrace so it can be used by the scheduler clock.
 194  *
 195  * Returns the number of cycles in the global counter (lower 32 bits).
 196  */
 197 static u32 notrace exynos4_read_count_32(void)
 198 {
 199         return readl_relaxed(reg_base + EXYNOS4_MCT_G_CNT_L);
 200 }
 201
 202 static cycle_t exynos4_frc_read(struct clocksource *cs)
 203 {
 204         return exynos4_read_count_32();
 205 }
 206
 207 static void exynos4_frc_resume(struct clocksource *cs)
 208 {
 209         exynos4_mct_frc_start();
 210 }
 211
 212 struct clocksource mct_frc = {
 213         .name           = "mct-frc",
 214         .rating         = 400,
 215         .read           = exynos4_frc_read,
 216         .mask           = CLOCKSOURCE_MASK(32),
 217         .flags          = CLOCK_SOURCE_IS_CONTINUOUS,
 218         .resume         = exynos4_frc_resume,
 219 };
 220
 221 static u64 notrace exynos4_read_sched_clock(void)
 222 {
 223         return exynos4_read_count_32();
 224 }
 225
 226 static struct delay_timer exynos4_delay_timer;
 227
 228 static cycles_t exynos4_read_current_timer(void)
 229 {
 230         BUILD_BUG_ON_MSG(sizeof(cycles_t) != sizeof(u32),
 231                          "cycles_t needs to move to 32-bit for ARM64 usage");
 232         return exynos4_read_count_32();
 233 }
 234
 235 static void __init exynos4_clocksource_init(void)
 236 {
 237         exynos4_mct_frc_start();
 238
 239         exynos4_delay_timer.read_current_timer = &exynos4_read_current_timer;
 240         exynos4_delay_timer.freq = clk_rate;
 241         register_current_timer_delay(&exynos4_delay_timer);
 242
 243         if (clocksource_register_hz(&mct_frc, clk_rate))
 244                 panic("%s: can't register clocksource\n", mct_frc.name);
 245
 246         sched_clock_register(exynos4_read_sched_clock, 32, clk_rate);
 247 }
 248
 249 static void exynos4_mct_comp0_stop(void)
 250 {
 251         unsigned int tcon;
 252
 253         tcon = readl_relaxed(reg_base + EXYNOS4_MCT_G_TCON);
 254         tcon &= ~(MCT_G_TCON_COMP0_ENABLE | MCT_G_TCON_COMP0_AUTO_INC);
 255
 256         exynos4_mct_write(tcon, EXYNOS4_MCT_G_TCON);
 257         exynos4_mct_write(0, EXYNOS4_MCT_G_INT_ENB);
 258 }
 259
 260 static void exynos4_mct_comp0_start(enum clock_event_mode mode,
 261                                     unsigned long cycles)
 262 {
 263         unsigned int tcon;
 264         cycle_t comp_cycle;
 265
 266         tcon = readl_relaxed(reg_base + EXYNOS4_MCT_G_TCON);
 267
 268         if (mode == CLOCK_EVT_MODE_PERIODIC) {
 269                 tcon |= MCT_G_TCON_COMP0_AUTO_INC;
 270                 exynos4_mct_write(cycles, EXYNOS4_MCT_G_COMP0_ADD_INCR);
 271         }
 272
 273         comp_cycle = exynos4_read_count_64() + cycles;
 274         exynos4_mct_write((u32)comp_cycle, EXYNOS4_MCT_G_COMP0_L);
 275         exynos4_mct_write((u32)(comp_cycle >> 32), EXYNOS4_MCT_G_COMP0_U);
 276
 277         exynos4_mct_write(0x1, EXYNOS4_MCT_G_INT_ENB);
 278
 279         tcon |= MCT_G_TCON_COMP0_ENABLE;
 280         exynos4_mct_write(tcon , EXYNOS4_MCT_G_TCON);
 281 }
 282
 283 static int exynos4_comp_set_next_event(unsigned long cycles,
 284                                        struct clock_event_device *evt)
 285 {
 286         exynos4_mct_comp0_start(evt->mode, cycles);
 287
 288         return 0;
 289 }
 290
 291 static void exynos4_comp_set_mode(enum clock_event_mode mode,
 292                                   struct clock_event_device *evt)
 293 {
 294         unsigned long cycles_per_jiffy;
 295         exynos4_mct_comp0_stop();
 296
 297         switch (mode) {
 298         case CLOCK_EVT_MODE_PERIODIC:
 299                 cycles_per_jiffy =
 300                         (((unsigned long long) NSEC_PER_SEC / HZ * evt->mult) >> evt->shift);
 301                 exynos4_mct_comp0_start(mode, cycles_per_jiffy);
 302                 break;
 303
 304         case CLOCK_EVT_MODE_ONESHOT:
 305         case CLOCK_EVT_MODE_UNUSED:
 306         case CLOCK_EVT_MODE_SHUTDOWN:
 307         case CLOCK_EVT_MODE_RESUME:
 308                 break;
 309         }
 310 }
 311
 312 static struct clock_event_device mct_comp_device = {
 313         .name           = "mct-comp",
 314         .features       = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT,
 315         .rating         = 250,
 316         .set_next_event = exynos4_comp_set_next_event,
 317         .set_mode       = exynos4_comp_set_mode,
 318 };
 319
 320 static irqreturn_t exynos4_mct_comp_isr(int irq, void *dev_id)
 321 {
 322         struct clock_event_device *evt = dev_id;
 323
 324         exynos4_mct_write(0x1, EXYNOS4_MCT_G_INT_CSTAT);
 325
 326         evt->event_handler(evt);
 327
 328         return IRQ_HANDLED;
 329 }
 330
 331 static struct irqaction mct_comp_event_irq = {
 332         .name           = "mct_comp_irq",
 333         .flags          = IRQF_TIMER | IRQF_IRQPOLL,
 334         .handler        = exynos4_mct_comp_isr,
 335         .dev_id         = &mct_comp_device,
 336 };
 337
 338 static void exynos4_clockevent_init(void)
 339 {
 340         mct_comp_device.cpumask = cpumask_of(0);
 341         clockevents_config_and_register(&mct_comp_device, clk_rate,
 342                                         0xf, 0xffffffff);
 343         setup_irq(mct_irqs[MCT_G0_IRQ], &mct_comp_event_irq);
 344 }
 345
 346 static DEFINE_PER_CPU(struct mct_clock_event_device, percpu_mct_tick);
 347
 348 /* Clock event handling */
 349 static void exynos4_mct_tick_stop(struct mct_clock_event_device *mevt)
 350 {
 351         unsigned long tmp;
 352         unsigned long mask = MCT_L_TCON_INT_START | MCT_L_TCON_TIMER_START;
 353         unsigned long offset = mevt->base + MCT_L_TCON_OFFSET;
 354
 355         tmp = readl_relaxed(reg_base + offset);
 356         if (tmp & mask) {
 357                 tmp &= ~mask;
 358                 exynos4_mct_write(tmp, offset);
 359         }
 360 }
 361
 362 static void exynos4_mct_tick_start(unsigned long cycles,
 363                                    struct mct_clock_event_device *mevt)
 364 {
 365         unsigned long tmp;
 366
 367         exynos4_mct_tick_stop(mevt);
 368
 369         tmp = (1 << 31) | cycles;       /* MCT_L_UPDATE_ICNTB */
 370
 371         /* update interrupt count buffer */
 372         exynos4_mct_write(tmp, mevt->base + MCT_L_ICNTB_OFFSET);
 373
 374         /* enable MCT tick interrupt */
 375         exynos4_mct_write(0x1, mevt->base + MCT_L_INT_ENB_OFFSET);
 376
 377         tmp = readl_relaxed(reg_base + mevt->base + MCT_L_TCON_OFFSET);
 378         tmp |= MCT_L_TCON_INT_START | MCT_L_TCON_TIMER_START |
 379                MCT_L_TCON_INTERVAL_MODE;
 380         exynos4_mct_write(tmp, mevt->base + MCT_L_TCON_OFFSET);
 381 }
 382
 383 static int exynos4_tick_set_next_event(unsigned long cycles,
 384                                        struct clock_event_device *evt)
 385 {
 386         struct mct_clock_event_device *mevt = this_cpu_ptr(&percpu_mct_tick);
 387
 388         exynos4_mct_tick_start(cycles, mevt);
 389
 390         return 0;
 391 }
 392
 393 static inline void exynos4_tick_set_mode(enum clock_event_mode mode,
 394                                          struct clock_event_device *evt)
 395 {
 396         struct mct_clock_event_device *mevt = this_cpu_ptr(&percpu_mct_tick);
 397         unsigned long cycles_per_jiffy;
 398
 399         exynos4_mct_tick_stop(mevt);
 400
 401         switch (mode) {
 402         case CLOCK_EVT_MODE_PERIODIC:
 403                 cycles_per_jiffy =
 404                         (((unsigned long long) NSEC_PER_SEC / HZ * evt->mult) >> evt->shift);
 405                 exynos4_mct_tick_start(cycles_per_jiffy, mevt);
 406                 break;
 407
 408         case CLOCK_EVT_MODE_ONESHOT:
 409         case CLOCK_EVT_MODE_UNUSED:
 410         case CLOCK_EVT_MODE_SHUTDOWN:
 411         case CLOCK_EVT_MODE_RESUME:
 412                 break;
 413         }
 414 }
 415
 416 static int exynos4_mct_tick_clear(struct mct_clock_event_device *mevt)
 417 {
 418         struct clock_event_device *evt = &mevt->evt;
 419
 420         /*
 421          * This is for supporting oneshot mode.
 422          * Mct would generate interrupt periodically
 423          * without explicit stopping.
 424          */
 425         if (evt->mode != CLOCK_EVT_MODE_PERIODIC)
 426                 exynos4_mct_tick_stop(mevt);
 427
 428         /* Clear the MCT tick interrupt */
 429         if (readl_relaxed(reg_base + mevt->base + MCT_L_INT_CSTAT_OFFSET) & 1) {
 430                 exynos4_mct_write(0x1, mevt->base + MCT_L_INT_CSTAT_OFFSET);
 431                 return 1;
 432         } else {
 433                 return 0;
 434         }
 435 }
 436
 437 static irqreturn_t exynos4_mct_tick_isr(int irq, void *dev_id)
 438 {
 439         struct mct_clock_event_device *mevt = dev_id;
 440         struct clock_event_device *evt = &mevt->evt;
 441
 442         exynos4_mct_tick_clear(mevt);
 443
 444         evt->event_handler(evt);
 445
 446         return IRQ_HANDLED;
 447 }
 448
 449 static int exynos4_local_timer_setup(struct clock_event_device *evt)
 450 {
 451         struct mct_clock_event_device *mevt;
 452         unsigned int cpu = smp_processor_id();
 453
 454         mevt = container_of(evt, struct mct_clock_event_device, evt);
 455
 456         mevt->base = EXYNOS4_MCT_L_BASE(cpu);
 457         snprintf(mevt->name, sizeof(mevt->name), "mct_tick%d", cpu);
 458
 459         evt->name = mevt->name;
 460         evt->cpumask = cpumask_of(cpu);
 461         evt->set_next_event = exynos4_tick_set_next_event;
 462         evt->set_mode = exynos4_tick_set_mode;
 463         evt->features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT;
 464         evt->rating = 450;
 465
 466         exynos4_mct_write(TICK_BASE_CNT, mevt->base + MCT_L_TCNTB_OFFSET);
 467
 468         if (mct_int_type == MCT_INT_SPI) {
 469                 evt->irq = mct_irqs[MCT_L0_IRQ + cpu];
 470                 if (request_irq(evt->irq, exynos4_mct_tick_isr,
 471                                 IRQF_TIMER | IRQF_NOBALANCING,
 472                                 evt->name, mevt)) {
 473                         pr_err("exynos-mct: cannot register IRQ %d\n",
 474                                 evt->irq);
 475                         return -EIO;
 476                 }
 477                 irq_force_affinity(mct_irqs[MCT_L0_IRQ + cpu], cpumask_of(cpu));
 478         } else {
 479                 enable_percpu_irq(mct_irqs[MCT_L0_IRQ], 0);
 480         }
 481         clockevents_config_and_register(evt, clk_rate / (TICK_BASE_CNT + 1),
 482                                         0xf, 0x7fffffff);
 483
 484         return 0;
 485 }
 486
 487 static void exynos4_local_timer_stop(struct clock_event_device *evt)
 488 {
 489         evt->set_mode(CLOCK_EVT_MODE_UNUSED, evt);
 490         if (mct_int_type == MCT_INT_SPI)
 491                 free_irq(evt->irq, this_cpu_ptr(&percpu_mct_tick));
 492         else
 493                 disable_percpu_irq(mct_irqs[MCT_L0_IRQ]);
 494 }
 495
 496 static int exynos4_mct_cpu_notify(struct notifier_block *self,
 497                                            unsigned long action, void *hcpu)
 498 {
 499         struct mct_clock_event_device *mevt;
 500
 501         /*
 502          * Grab cpu pointer in each case to avoid spurious
 503          * preemptible warnings
 504          */
 505         switch (action & ~CPU_TASKS_FROZEN) {
 506         case CPU_STARTING:
 507                 mevt = this_cpu_ptr(&percpu_mct_tick);
 508                 exynos4_local_timer_setup(&mevt->evt);
 509                 break;
 510         case CPU_DYING:
 511                 mevt = this_cpu_ptr(&percpu_mct_tick);
 512                 exynos4_local_timer_stop(&mevt->evt);
 513                 break;
 514         }
 515
 516         return NOTIFY_OK;
 517 }
 518
 519 static struct notifier_block exynos4_mct_cpu_nb = {
 520         .notifier_call = exynos4_mct_cpu_notify,
 521 };
 522
 523 static void __init exynos4_timer_resources(struct device_node *np, void __iomem *base)
 524 {
 525         int err;
 526         struct mct_clock_event_device *mevt = this_cpu_ptr(&percpu_mct_tick);
 527         struct clk *mct_clk, *tick_clk;
 528
 529         tick_clk = np ? of_clk_get_by_name(np, "fin_pll") :
 530                                 clk_get(NULL, "fin_pll");
 531         if (IS_ERR(tick_clk))
 532                 panic("%s: unable to determine tick clock rate\n", __func__);
 533         clk_rate = clk_get_rate(tick_clk);
 534
 535         mct_clk = np ? of_clk_get_by_name(np, "mct") : clk_get(NULL, "mct");
 536         if (IS_ERR(mct_clk))
 537                 panic("%s: unable to retrieve mct clock instance\n", __func__);
 538         clk_prepare_enable(mct_clk);
 539
 540         reg_base = base;
 541         if (!reg_base)
 542                 panic("%s: unable to ioremap mct address space\n", __func__);
 543
 544         if (mct_int_type == MCT_INT_PPI) {
 545
 546                 err = request_percpu_irq(mct_irqs[MCT_L0_IRQ],
 547                                          exynos4_mct_tick_isr, "MCT",
 548                                          &percpu_mct_tick);
 549                 WARN(err, "MCT: can't request IRQ %d (%d)\n",
 550                      mct_irqs[MCT_L0_IRQ], err);
 551         } else {
 552                 irq_set_affinity(mct_irqs[MCT_L0_IRQ], cpumask_of(0));
 553         }
 554
 555         err = register_cpu_notifier(&exynos4_mct_cpu_nb);
 556         if (err)
 557                 goto out_irq;
 558
 559         /* Immediately configure the timer on the boot CPU */
 560         exynos4_local_timer_setup(&mevt->evt);
 561         return;
 562
 563 out_irq:
 564         free_percpu_irq(mct_irqs[MCT_L0_IRQ], &percpu_mct_tick);
 565 }
 566
 567 void __init mct_init(void __iomem *base, int irq_g0, int irq_l0, int irq_l1)
 568 {
 569         mct_irqs[MCT_G0_IRQ] = irq_g0;
 570         mct_irqs[MCT_L0_IRQ] = irq_l0;
 571         mct_irqs[MCT_L1_IRQ] = irq_l1;
 572         mct_int_type = MCT_INT_SPI;
 573
 574         exynos4_timer_resources(NULL, base);
 575         exynos4_clocksource_init();
 576         exynos4_clockevent_init();
 577 }
 578
 579 static void __init mct_init_dt(struct device_node *np, unsigned int int_type)
 580 {
 581         u32 nr_irqs, i;
 582
 583         mct_int_type = int_type;
 584
 585         /* This driver uses only one global timer interrupt */
 586         mct_irqs[MCT_G0_IRQ] = irq_of_parse_and_map(np, MCT_G0_IRQ);
 587
 588         /*
 589          * Find out the number of local irqs specified. The local
 590          * timer irqs are specified after the four global timer
 591          * irqs are specified.
 592          */
 593 #ifdef CONFIG_OF
 594         nr_irqs = of_irq_count(np);
 595 #else
 596         nr_irqs = 0;
 597 #endif
 598         for (i = MCT_L0_IRQ; i < nr_irqs; i++)
 599                 mct_irqs[i] = irq_of_parse_and_map(np, i);
 600
 601         exynos4_timer_resources(np, of_iomap(np, 0));
 602         exynos4_clocksource_init();
 603         exynos4_clockevent_init();
 604 }
 605
 606
 607 static void __init mct_init_spi(struct device_node *np)
 608 {
 609         return mct_init_dt(np, MCT_INT_SPI);
 610 }
 611
 612 static void __init mct_init_ppi(struct device_node *np)
 613 {
 614         return mct_init_dt(np, MCT_INT_PPI);
 615 }
 616 CLOCKSOURCE_OF_DECLARE(exynos4210, "samsung,exynos4210-mct", mct_init_spi);
 617 CLOCKSOURCE_OF_DECLARE(exynos4412, "samsung,exynos4412-mct", mct_init_ppi);