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