arch/arm/mach-omap2/omap-wakeupgen.c

   1 /*
   2  * OMAP WakeupGen Source file
   3  *
   4  * OMAP WakeupGen is the interrupt controller extension used along
   5  * with ARM GIC to wake the CPU out from low power states on
   6  * external interrupts. It is responsible for generating wakeup
   7  * event from the incoming interrupts and enable bits. It is
   8  * implemented in MPU always ON power domain. During normal operation,
   9  * WakeupGen delivers external interrupts directly to the GIC.
  10  *
  11  * Copyright (C) 2011 Texas Instruments, Inc.
  12  *      Santosh Shilimkar <santosh.shilimkar@ti.com>
  13  *
  14  * This program is free software; you can redistribute it and/or modify
  15  * it under the terms of the GNU General Public License version 2 as
  16  * published by the Free Software Foundation.
  17  */
  18
  19 #include <linux/kernel.h>
  20 #include <linux/init.h>
  21 #include <linux/io.h>
  22 #include <linux/irq.h>
  23 #include <linux/irqchip.h>
  24 #include <linux/irqdomain.h>
  25 #include <linux/of_address.h>
  26 #include <linux/platform_device.h>
  27 #include <linux/cpu.h>
  28 #include <linux/notifier.h>
  29 #include <linux/cpu_pm.h>
  30
  31 #include "omap-wakeupgen.h"
  32 #include "omap-secure.h"
  33
  34 #include "soc.h"
  35 #include "omap4-sar-layout.h"
  36 #include "common.h"
  37 #include "pm.h"
  38
  39 #define AM43XX_NR_REG_BANKS     7
  40 #define AM43XX_IRQS             224
  41 #define MAX_NR_REG_BANKS        AM43XX_NR_REG_BANKS
  42 #define MAX_IRQS                AM43XX_IRQS
  43 #define DEFAULT_NR_REG_BANKS    5
  44 #define DEFAULT_IRQS            160
  45 #define WKG_MASK_ALL            0x00000000
  46 #define WKG_UNMASK_ALL          0xffffffff
  47 #define CPU_ENA_OFFSET          0x400
  48 #define CPU0_ID                 0x0
  49 #define CPU1_ID                 0x1
  50 #define OMAP4_NR_BANKS          4
  51 #define OMAP4_NR_IRQS           128
  52
  53 static void __iomem *wakeupgen_base;
  54 static void __iomem *sar_base;
  55 static DEFINE_RAW_SPINLOCK(wakeupgen_lock);
  56 static unsigned int irq_target_cpu[MAX_IRQS];
  57 static unsigned int irq_banks = DEFAULT_NR_REG_BANKS;
  58 static unsigned int max_irqs = DEFAULT_IRQS;
  59 static unsigned int omap_secure_apis;
  60
  61 #ifdef CONFIG_CPU_PM
  62 static unsigned int wakeupgen_context[MAX_NR_REG_BANKS];
  63 #endif
  64
  65 struct omap_wakeupgen_ops {
  66         void (*save_context)(void);
  67         void (*restore_context)(void);
  68 };
  69
  70 static struct omap_wakeupgen_ops *wakeupgen_ops;
  71
  72 /*
  73  * Static helper functions.
  74  */
  75 static inline u32 wakeupgen_readl(u8 idx, u32 cpu)
  76 {
  77         return readl_relaxed(wakeupgen_base + OMAP_WKG_ENB_A_0 +
  78                                 (cpu * CPU_ENA_OFFSET) + (idx * 4));
  79 }
  80
  81 static inline void wakeupgen_writel(u32 val, u8 idx, u32 cpu)
  82 {
  83         writel_relaxed(val, wakeupgen_base + OMAP_WKG_ENB_A_0 +
  84                                 (cpu * CPU_ENA_OFFSET) + (idx * 4));
  85 }
  86
  87 static inline void sar_writel(u32 val, u32 offset, u8 idx)
  88 {
  89         writel_relaxed(val, sar_base + offset + (idx * 4));
  90 }
  91
  92 static inline int _wakeupgen_get_irq_info(u32 irq, u32 *bit_posn, u8 *reg_index)
  93 {
  94         /*
  95          * Each WakeupGen register controls 32 interrupt.
  96          * i.e. 1 bit per SPI IRQ
  97          */
  98         *reg_index = irq >> 5;
  99         *bit_posn = irq %= 32;
 100
 101         return 0;
 102 }
 103
 104 static void _wakeupgen_clear(unsigned int irq, unsigned int cpu)
 105 {
 106         u32 val, bit_number;
 107         u8 i;
 108
 109         if (_wakeupgen_get_irq_info(irq, &bit_number, &i))
 110                 return;
 111
 112         val = wakeupgen_readl(i, cpu);
 113         val &= ~BIT(bit_number);
 114         wakeupgen_writel(val, i, cpu);
 115 }
 116
 117 static void _wakeupgen_set(unsigned int irq, unsigned int cpu)
 118 {
 119         u32 val, bit_number;
 120         u8 i;
 121
 122         if (_wakeupgen_get_irq_info(irq, &bit_number, &i))
 123                 return;
 124
 125         val = wakeupgen_readl(i, cpu);
 126         val |= BIT(bit_number);
 127         wakeupgen_writel(val, i, cpu);
 128 }
 129
 130 /*
 131  * Architecture specific Mask extension
 132  */
 133 static void wakeupgen_mask(struct irq_data *d)
 134 {
 135         unsigned long flags;
 136
 137         raw_spin_lock_irqsave(&wakeupgen_lock, flags);
 138         _wakeupgen_clear(d->hwirq, irq_target_cpu[d->hwirq]);
 139         raw_spin_unlock_irqrestore(&wakeupgen_lock, flags);
 140         irq_chip_mask_parent(d);
 141 }
 142
 143 /*
 144  * Architecture specific Unmask extension
 145  */
 146 static void wakeupgen_unmask(struct irq_data *d)
 147 {
 148         unsigned long flags;
 149
 150         raw_spin_lock_irqsave(&wakeupgen_lock, flags);
 151         _wakeupgen_set(d->hwirq, irq_target_cpu[d->hwirq]);
 152         raw_spin_unlock_irqrestore(&wakeupgen_lock, flags);
 153         irq_chip_unmask_parent(d);
 154 }
 155
 156 #ifdef CONFIG_HOTPLUG_CPU
 157 static DEFINE_PER_CPU(u32 [MAX_NR_REG_BANKS], irqmasks);
 158
 159 static void _wakeupgen_save_masks(unsigned int cpu)
 160 {
 161         u8 i;
 162
 163         for (i = 0; i < irq_banks; i++)
 164                 per_cpu(irqmasks, cpu)[i] = wakeupgen_readl(i, cpu);
 165 }
 166
 167 static void _wakeupgen_restore_masks(unsigned int cpu)
 168 {
 169         u8 i;
 170
 171         for (i = 0; i < irq_banks; i++)
 172                 wakeupgen_writel(per_cpu(irqmasks, cpu)[i], i, cpu);
 173 }
 174
 175 static void _wakeupgen_set_all(unsigned int cpu, unsigned int reg)
 176 {
 177         u8 i;
 178
 179         for (i = 0; i < irq_banks; i++)
 180                 wakeupgen_writel(reg, i, cpu);
 181 }
 182
 183 /*
 184  * Mask or unmask all interrupts on given CPU.
 185  *      0 = Mask all interrupts on the 'cpu'
 186  *      1 = Unmask all interrupts on the 'cpu'
 187  * Ensure that the initial mask is maintained. This is faster than
 188  * iterating through GIC registers to arrive at the correct masks.
 189  */
 190 static void wakeupgen_irqmask_all(unsigned int cpu, unsigned int set)
 191 {
 192         unsigned long flags;
 193
 194         raw_spin_lock_irqsave(&wakeupgen_lock, flags);
 195         if (set) {
 196                 _wakeupgen_save_masks(cpu);
 197                 _wakeupgen_set_all(cpu, WKG_MASK_ALL);
 198         } else {
 199                 _wakeupgen_set_all(cpu, WKG_UNMASK_ALL);
 200                 _wakeupgen_restore_masks(cpu);
 201         }
 202         raw_spin_unlock_irqrestore(&wakeupgen_lock, flags);
 203 }
 204 #endif
 205
 206 #ifdef CONFIG_CPU_PM
 207 static inline void omap4_irq_save_context(void)
 208 {
 209         u32 i, val;
 210
 211         if (omap_rev() == OMAP4430_REV_ES1_0)
 212                 return;
 213
 214         for (i = 0; i < irq_banks; i++) {
 215                 /* Save the CPUx interrupt mask for IRQ 0 to 127 */
 216                 val = wakeupgen_readl(i, 0);
 217                 sar_writel(val, WAKEUPGENENB_OFFSET_CPU0, i);
 218                 val = wakeupgen_readl(i, 1);
 219                 sar_writel(val, WAKEUPGENENB_OFFSET_CPU1, i);
 220
 221                 /*
 222                  * Disable the secure interrupts for CPUx. The restore
 223                  * code blindly restores secure and non-secure interrupt
 224                  * masks from SAR RAM. Secure interrupts are not suppose
 225                  * to be enabled from HLOS. So overwrite the SAR location
 226                  * so that the secure interrupt remains disabled.
 227                  */
 228                 sar_writel(0x0, WAKEUPGENENB_SECURE_OFFSET_CPU0, i);
 229                 sar_writel(0x0, WAKEUPGENENB_SECURE_OFFSET_CPU1, i);
 230         }
 231
 232         /* Save AuxBoot* registers */
 233         val = readl_relaxed(wakeupgen_base + OMAP_AUX_CORE_BOOT_0);
 234         writel_relaxed(val, sar_base + AUXCOREBOOT0_OFFSET);
 235         val = readl_relaxed(wakeupgen_base + OMAP_AUX_CORE_BOOT_1);
 236         writel_relaxed(val, sar_base + AUXCOREBOOT1_OFFSET);
 237
 238         /* Save SyncReq generation logic */
 239         val = readl_relaxed(wakeupgen_base + OMAP_PTMSYNCREQ_MASK);
 240         writel_relaxed(val, sar_base + PTMSYNCREQ_MASK_OFFSET);
 241         val = readl_relaxed(wakeupgen_base + OMAP_PTMSYNCREQ_EN);
 242         writel_relaxed(val, sar_base + PTMSYNCREQ_EN_OFFSET);
 243
 244         /* Set the Backup Bit Mask status */
 245         val = readl_relaxed(sar_base + SAR_BACKUP_STATUS_OFFSET);
 246         val |= SAR_BACKUP_STATUS_WAKEUPGEN;
 247         writel_relaxed(val, sar_base + SAR_BACKUP_STATUS_OFFSET);
 248
 249 }
 250
 251 static inline void omap5_irq_save_context(void)
 252 {
 253         u32 i, val;
 254
 255         for (i = 0; i < irq_banks; i++) {
 256                 /* Save the CPUx interrupt mask for IRQ 0 to 159 */
 257                 val = wakeupgen_readl(i, 0);
 258                 sar_writel(val, OMAP5_WAKEUPGENENB_OFFSET_CPU0, i);
 259                 val = wakeupgen_readl(i, 1);
 260                 sar_writel(val, OMAP5_WAKEUPGENENB_OFFSET_CPU1, i);
 261                 sar_writel(0x0, OMAP5_WAKEUPGENENB_SECURE_OFFSET_CPU0, i);
 262                 sar_writel(0x0, OMAP5_WAKEUPGENENB_SECURE_OFFSET_CPU1, i);
 263         }
 264
 265         /* Save AuxBoot* registers */
 266         val = readl_relaxed(wakeupgen_base + OMAP_AUX_CORE_BOOT_0);
 267         writel_relaxed(val, sar_base + OMAP5_AUXCOREBOOT0_OFFSET);
 268         val = readl_relaxed(wakeupgen_base + OMAP_AUX_CORE_BOOT_0);
 269         writel_relaxed(val, sar_base + OMAP5_AUXCOREBOOT1_OFFSET);
 270
 271         /* Set the Backup Bit Mask status */
 272         val = readl_relaxed(sar_base + OMAP5_SAR_BACKUP_STATUS_OFFSET);
 273         val |= SAR_BACKUP_STATUS_WAKEUPGEN;
 274         writel_relaxed(val, sar_base + OMAP5_SAR_BACKUP_STATUS_OFFSET);
 275
 276 }
 277
 278 static inline void am43xx_irq_save_context(void)
 279 {
 280         u32 i;
 281
 282         for (i = 0; i < irq_banks; i++) {
 283                 wakeupgen_context[i] = wakeupgen_readl(i, 0);
 284                 wakeupgen_writel(0, i, CPU0_ID);
 285         }
 286 }
 287
 288 /*
 289  * Save WakeupGen interrupt context in SAR BANK3. Restore is done by
 290  * ROM code. WakeupGen IP is integrated along with GIC to manage the
 291  * interrupt wakeups from CPU low power states. It manages
 292  * masking/unmasking of Shared peripheral interrupts(SPI). So the
 293  * interrupt enable/disable control should be in sync and consistent
 294  * at WakeupGen and GIC so that interrupts are not lost.
 295  */
 296 static void irq_save_context(void)
 297 {
 298         /* DRA7 has no SAR to save */
 299         if (soc_is_dra7xx())
 300                 return;
 301
 302         if (wakeupgen_ops && wakeupgen_ops->save_context)
 303                 wakeupgen_ops->save_context();
 304 }
 305
 306 /*
 307  * Clear WakeupGen SAR backup status.
 308  */
 309 static void irq_sar_clear(void)
 310 {
 311         u32 val;
 312         u32 offset = SAR_BACKUP_STATUS_OFFSET;
 313         /* DRA7 has no SAR to save */
 314         if (soc_is_dra7xx())
 315                 return;
 316
 317         if (soc_is_omap54xx())
 318                 offset = OMAP5_SAR_BACKUP_STATUS_OFFSET;
 319
 320         val = readl_relaxed(sar_base + offset);
 321         val &= ~SAR_BACKUP_STATUS_WAKEUPGEN;
 322         writel_relaxed(val, sar_base + offset);
 323 }
 324
 325 static void am43xx_irq_restore_context(void)
 326 {
 327         u32 i;
 328
 329         for (i = 0; i < irq_banks; i++)
 330                 wakeupgen_writel(wakeupgen_context[i], i, CPU0_ID);
 331 }
 332
 333 static void irq_restore_context(void)
 334 {
 335         if (wakeupgen_ops && wakeupgen_ops->restore_context)
 336                 wakeupgen_ops->restore_context();
 337 }
 338
 339 /*
 340  * Save GIC and Wakeupgen interrupt context using secure API
 341  * for HS/EMU devices.
 342  */
 343 static void irq_save_secure_context(void)
 344 {
 345         u32 ret;
 346         ret = omap_secure_dispatcher(OMAP4_HAL_SAVEGIC_INDEX,
 347                                 FLAG_START_CRITICAL,
 348                                 0, 0, 0, 0, 0);
 349         if (ret != API_HAL_RET_VALUE_OK)
 350                 pr_err("GIC and Wakeupgen context save failed\n");
 351 }
 352
 353 /* Define ops for context save and restore for each SoC */
 354 static struct omap_wakeupgen_ops omap4_wakeupgen_ops = {
 355         .save_context = omap4_irq_save_context,
 356         .restore_context = irq_sar_clear,
 357 };
 358
 359 static struct omap_wakeupgen_ops omap5_wakeupgen_ops = {
 360         .save_context = omap5_irq_save_context,
 361         .restore_context = irq_sar_clear,
 362 };
 363
 364 static struct omap_wakeupgen_ops am43xx_wakeupgen_ops = {
 365         .save_context = am43xx_irq_save_context,
 366         .restore_context = am43xx_irq_restore_context,
 367 };
 368 #else
 369 static struct omap_wakeupgen_ops omap4_wakeupgen_ops = {};
 370 static struct omap_wakeupgen_ops omap5_wakeupgen_ops = {};
 371 static struct omap_wakeupgen_ops am43xx_wakeupgen_ops = {};
 372 #endif
 373
 374 #ifdef CONFIG_HOTPLUG_CPU
 375 static int omap_wakeupgen_cpu_online(unsigned int cpu)
 376 {
 377         wakeupgen_irqmask_all(cpu, 0);
 378         return 0;
 379 }
 380
 381 static int omap_wakeupgen_cpu_dead(unsigned int cpu)
 382 {
 383         wakeupgen_irqmask_all(cpu, 1);
 384         return 0;
 385 }
 386
 387 static void __init irq_hotplug_init(void)
 388 {
 389         cpuhp_setup_state_nocalls(CPUHP_AP_ONLINE_DYN, "arm/omap-wake:online",
 390                                   omap_wakeupgen_cpu_online, NULL);
 391         cpuhp_setup_state_nocalls(CPUHP_ARM_OMAP_WAKE_DEAD,
 392                                   "arm/omap-wake:dead", NULL,
 393                                   omap_wakeupgen_cpu_dead);
 394 }
 395 #else
 396 static void __init irq_hotplug_init(void)
 397 {}
 398 #endif
 399
 400 #ifdef CONFIG_CPU_PM
 401 static int irq_notifier(struct notifier_block *self, unsigned long cmd, void *v)
 402 {
 403         switch (cmd) {
 404         case CPU_CLUSTER_PM_ENTER:
 405                 if (omap_type() == OMAP2_DEVICE_TYPE_GP)
 406                         irq_save_context();
 407                 else
 408                         irq_save_secure_context();
 409                 break;
 410         case CPU_CLUSTER_PM_EXIT:
 411                 if (omap_type() == OMAP2_DEVICE_TYPE_GP)
 412                         irq_restore_context();
 413                 break;
 414         }
 415         return NOTIFY_OK;
 416 }
 417
 418 static struct notifier_block irq_notifier_block = {
 419         .notifier_call = irq_notifier,
 420 };
 421
 422 static void __init irq_pm_init(void)
 423 {
 424         /* FIXME: Remove this when MPU OSWR support is added */
 425         if (!IS_PM44XX_ERRATUM(PM_OMAP4_CPU_OSWR_DISABLE))
 426                 cpu_pm_register_notifier(&irq_notifier_block);
 427 }
 428 #else
 429 static void __init irq_pm_init(void)
 430 {}
 431 #endif
 432
 433 void __iomem *omap_get_wakeupgen_base(void)
 434 {
 435         return wakeupgen_base;
 436 }
 437
 438 int omap_secure_apis_support(void)
 439 {
 440         return omap_secure_apis;
 441 }
 442
 443 static struct irq_chip wakeupgen_chip = {
 444         .name                   = "WUGEN",
 445         .irq_eoi                = irq_chip_eoi_parent,
 446         .irq_mask               = wakeupgen_mask,
 447         .irq_unmask             = wakeupgen_unmask,
 448         .irq_retrigger          = irq_chip_retrigger_hierarchy,
 449         .irq_set_type           = irq_chip_set_type_parent,
 450         .flags                  = IRQCHIP_SKIP_SET_WAKE | IRQCHIP_MASK_ON_SUSPEND,
 451 #ifdef CONFIG_SMP
 452         .irq_set_affinity       = irq_chip_set_affinity_parent,
 453 #endif
 454 };
 455
 456 static int wakeupgen_domain_translate(struct irq_domain *d,
 457                                       struct irq_fwspec *fwspec,
 458                                       unsigned long *hwirq,
 459                                       unsigned int *type)
 460 {
 461         if (is_of_node(fwspec->fwnode)) {
 462                 if (fwspec->param_count != 3)
 463                         return -EINVAL;
 464
 465                 /* No PPI should point to this domain */
 466                 if (fwspec->param[0] != 0)
 467                         return -EINVAL;
 468
 469                 *hwirq = fwspec->param[1];
 470                 *type = fwspec->param[2];
 471                 return 0;
 472         }
 473
 474         return -EINVAL;
 475 }
 476
 477 static int wakeupgen_domain_alloc(struct irq_domain *domain,
 478                                   unsigned int virq,
 479                                   unsigned int nr_irqs, void *data)
 480 {
 481         struct irq_fwspec *fwspec = data;
 482         struct irq_fwspec parent_fwspec;
 483         irq_hw_number_t hwirq;
 484         int i;
 485
 486         if (fwspec->param_count != 3)
 487                 return -EINVAL; /* Not GIC compliant */
 488         if (fwspec->param[0] != 0)
 489                 return -EINVAL; /* No PPI should point to this domain */
 490
 491         hwirq = fwspec->param[1];
 492         if (hwirq >= MAX_IRQS)
 493                 return -EINVAL; /* Can't deal with this */
 494
 495         for (i = 0; i < nr_irqs; i++)
 496                 irq_domain_set_hwirq_and_chip(domain, virq + i, hwirq + i,
 497                                               &wakeupgen_chip, NULL);
 498
 499         parent_fwspec = *fwspec;
 500         parent_fwspec.fwnode = domain->parent->fwnode;
 501         return irq_domain_alloc_irqs_parent(domain, virq, nr_irqs,
 502                                             &parent_fwspec);
 503 }
 504
 505 static const struct irq_domain_ops wakeupgen_domain_ops = {
 506         .translate      = wakeupgen_domain_translate,
 507         .alloc          = wakeupgen_domain_alloc,
 508         .free           = irq_domain_free_irqs_common,
 509 };
 510
 511 /*
 512  * Initialise the wakeupgen module.
 513  */
 514 static int __init wakeupgen_init(struct device_node *node,
 515                                  struct device_node *parent)
 516 {
 517         struct irq_domain *parent_domain, *domain;
 518         int i;
 519         unsigned int boot_cpu = smp_processor_id();
 520         u32 val;
 521
 522         if (!parent) {
 523                 pr_err("%pOF: no parent, giving up\n", node);
 524                 return -ENODEV;
 525         }
 526
 527         parent_domain = irq_find_host(parent);
 528         if (!parent_domain) {
 529                 pr_err("%pOF: unable to obtain parent domain\n", node);
 530                 return -ENXIO;
 531         }
 532         /* Not supported on OMAP4 ES1.0 silicon */
 533         if (omap_rev() == OMAP4430_REV_ES1_0) {
 534                 WARN(1, "WakeupGen: Not supported on OMAP4430 ES1.0\n");
 535                 return -EPERM;
 536         }
 537
 538         /* Static mapping, never released */
 539         wakeupgen_base = of_iomap(node, 0);
 540         if (WARN_ON(!wakeupgen_base))
 541                 return -ENOMEM;
 542
 543         if (cpu_is_omap44xx()) {
 544                 irq_banks = OMAP4_NR_BANKS;
 545                 max_irqs = OMAP4_NR_IRQS;
 546                 omap_secure_apis = 1;
 547                 wakeupgen_ops = &omap4_wakeupgen_ops;
 548         } else if (soc_is_omap54xx()) {
 549                 wakeupgen_ops = &omap5_wakeupgen_ops;
 550         } else if (soc_is_am43xx()) {
 551                 irq_banks = AM43XX_NR_REG_BANKS;
 552                 max_irqs = AM43XX_IRQS;
 553                 wakeupgen_ops = &am43xx_wakeupgen_ops;
 554         }
 555
 556         domain = irq_domain_add_hierarchy(parent_domain, 0, max_irqs,
 557                                           node, &wakeupgen_domain_ops,
 558                                           NULL);
 559         if (!domain) {
 560                 iounmap(wakeupgen_base);
 561                 return -ENOMEM;
 562         }
 563
 564         /* Clear all IRQ bitmasks at wakeupGen level */
 565         for (i = 0; i < irq_banks; i++) {
 566                 wakeupgen_writel(0, i, CPU0_ID);
 567                 if (!soc_is_am43xx())
 568                         wakeupgen_writel(0, i, CPU1_ID);
 569         }
 570
 571         /*
 572          * FIXME: Add support to set_smp_affinity() once the core
 573          * GIC code has necessary hooks in place.
 574          */
 575
 576         /* Associate all the IRQs to boot CPU like GIC init does. */
 577         for (i = 0; i < max_irqs; i++)
 578                 irq_target_cpu[i] = boot_cpu;
 579
 580         /*
 581          * Enables OMAP5 ES2 PM Mode using ES2_PM_MODE in AMBA_IF_MODE
 582          * 0x0: ES1 behavior, CPU cores would enter and exit OFF mode together.
 583          * 0x1: ES2 behavior, CPU cores are allowed to enter/exit OFF mode
 584          * independently.
 585          * This needs to be set one time thanks to always ON domain.
 586          *
 587          * We do not support ES1 behavior anymore. OMAP5 is assumed to be
 588          * ES2.0, and the same is applicable for DRA7.
 589          */
 590         if (soc_is_omap54xx() || soc_is_dra7xx()) {
 591                 val = __raw_readl(wakeupgen_base + OMAP_AMBA_IF_MODE);
 592                 val |= BIT(5);
 593                 omap_smc1(OMAP5_MON_AMBA_IF_INDEX, val);
 594         }
 595
 596         irq_hotplug_init();
 597         irq_pm_init();
 598
 599         sar_base = omap4_get_sar_ram_base();
 600
 601         return 0;
 602 }
 603 IRQCHIP_DECLARE(ti_wakeupgen, "ti,omap4-wugen-mpu", wakeupgen_init);