arch/arm/plat-omap/pm.c

   1 /*
   2  * linux/arch/arm/plat-omap/pm.c
   3  *
   4  * OMAP Power Management Routines
   5  *
   6  * Original code for the SA11x0:
   7  * Copyright (c) 2001 Cliff Brake <cbrake@accelent.com>
   8  *
   9  * Modified for the PXA250 by Nicolas Pitre:
  10  * Copyright (c) 2002 Monta Vista Software, Inc.
  11  *
  12  * Modified for the OMAP1510 by David Singleton:
  13  * Copyright (c) 2002 Monta Vista Software, Inc.
  14  *
  15  * Cleanup 2004 for OMAP1510/1610 by Dirk Behme <dirk.behme@de.bosch.com>
  16  *
  17  * This program is free software; you can redistribute it and/or modify it
  18  * under the terms of the GNU General Public License as published by the
  19  * Free Software Foundation; either version 2 of the License, or (at your
  20  * option) any later version.
  21  *
  22  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  23  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  24  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
  25  * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  26  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  27  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
  28  * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
  29  * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  30  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  31  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  32  *
  33  * You should have received a copy of the GNU General Public License along
  34  * with this program; if not, write to the Free Software Foundation, Inc.,
  35  * 675 Mass Ave, Cambridge, MA 02139, USA.
  36  */
  37
  38 #include <linux/pm.h>
  39 #include <linux/sched.h>
  40 #include <linux/proc_fs.h>
  41 #include <linux/pm.h>
  42 #include <linux/interrupt.h>
  43
  44 #include <asm/io.h>
  45 #include <asm/irq.h>
  46 #include <asm/mach/time.h>
  47 #include <asm/mach/irq.h>
  48
  49 #include <asm/mach-types.h>
  50 #include <asm/arch/irqs.h>
  51 #include <asm/arch/tc.h>
  52 #include <asm/arch/pm.h>
  53 #include <asm/arch/mux.h>
  54 #include <asm/arch/tps65010.h>
  55 #include <asm/arch/dsp_common.h>
  56
  57 #include "clock.h"
  58 #include "sram.h"
  59
  60 static unsigned int arm_sleep_save[ARM_SLEEP_SAVE_SIZE];
  61 static unsigned short ulpd_sleep_save[ULPD_SLEEP_SAVE_SIZE];
  62 static unsigned int mpui1510_sleep_save[MPUI1510_SLEEP_SAVE_SIZE];
  63 static unsigned int mpui1610_sleep_save[MPUI1610_SLEEP_SAVE_SIZE];
  64
  65 static void (*omap_sram_idle)(void) = NULL;
  66 static void (*omap_sram_suspend)(unsigned long r0, unsigned long r1) = NULL;
  67
  68 /*
  69  * Let's power down on idle, but only if we are really
  70  * idle, because once we start down the path of
  71  * going idle we continue to do idle even if we get
  72  * a clock tick interrupt . .
  73  */
  74 void omap_pm_idle(void)
  75 {
  76         unsigned int mask32 = 0;
  77
  78         /*
  79          * If the DSP is being used let's just idle the CPU, the overhead
  80          * to wake up from Big Sleep is big, milliseconds versus micro
  81          * seconds for wait for interrupt.
  82          */
  83
  84         local_irq_disable();
  85         local_fiq_disable();
  86         if (need_resched()) {
  87                 local_fiq_enable();
  88                 local_irq_enable();
  89                 return;
  90         }
  91         mask32 = omap_readl(ARM_SYSST);
  92
  93         /*
  94          * Prevent the ULPD from entering low power state by setting
  95          * POWER_CTRL_REG:4 = 0
  96          */
  97         omap_writew(omap_readw(ULPD_POWER_CTRL) &
  98                     ~ULPD_DEEP_SLEEP_TRANSITION_EN, ULPD_POWER_CTRL);
  99
 100         /*
 101          * Since an interrupt may set up a timer, we don't want to
 102          * reprogram the hardware timer with interrupts enabled.
 103          * Re-enable interrupts only after returning from idle.
 104          */
 105         timer_dyn_reprogram();
 106
 107         if ((mask32 & DSP_IDLE) == 0) {
 108                 __asm__ volatile ("mcr  p15, 0, r0, c7, c0, 4");
 109         } else
 110                 omap_sram_idle();
 111
 112         local_fiq_enable();
 113         local_irq_enable();
 114 }
 115
 116 /*
 117  * Configuration of the wakeup event is board specific. For the
 118  * moment we put it into this helper function. Later it may move
 119  * to board specific files.
 120  */
 121 static void omap_pm_wakeup_setup(void)
 122 {
 123         u32 level1_wake = OMAP_IRQ_BIT(INT_IH2_IRQ);
 124         u32 level2_wake = OMAP_IRQ_BIT(INT_UART2) | OMAP_IRQ_BIT(INT_KEYBOARD);
 125
 126         /*
 127          * Turn off all interrupts except GPIO bank 1, L1-2nd level cascade,
 128          * and the L2 wakeup interrupts: keypad and UART2. Note that the
 129          * drivers must still separately call omap_set_gpio_wakeup() to
 130          * wake up to a GPIO interrupt.
 131          */
 132         if (cpu_is_omap1510() || cpu_is_omap16xx())
 133                 level1_wake |= OMAP_IRQ_BIT(INT_GPIO_BANK1);
 134         else if (cpu_is_omap730())
 135                 level1_wake |= OMAP_IRQ_BIT(INT_730_GPIO_BANK1);
 136
 137         omap_writel(~level1_wake, OMAP_IH1_MIR);
 138
 139         if (cpu_is_omap1510())
 140                 omap_writel(~level2_wake,  OMAP_IH2_MIR);
 141
 142         /* INT_1610_WAKE_UP_REQ is needed for GPIO wakeup... */
 143         if (cpu_is_omap16xx()) {
 144                 omap_writel(~level2_wake, OMAP_IH2_0_MIR);
 145                 omap_writel(~OMAP_IRQ_BIT(INT_1610_WAKE_UP_REQ), OMAP_IH2_1_MIR);
 146                 omap_writel(~0x0, OMAP_IH2_2_MIR);
 147                 omap_writel(~0x0, OMAP_IH2_3_MIR);
 148         }
 149
 150         /*  New IRQ agreement, recalculate in cascade order */
 151         omap_writel(1, OMAP_IH2_CONTROL);
 152         omap_writel(1, OMAP_IH1_CONTROL);
 153 }
 154
 155 void omap_pm_suspend(void)
 156 {
 157         unsigned long arg0 = 0, arg1 = 0;
 158
 159         printk("PM: OMAP%x is trying to enter deep sleep...\n", system_rev);
 160
 161         omap_serial_wake_trigger(1);
 162
 163         if (machine_is_omap_osk()) {
 164                 /* Stop LED1 (D9) blink */
 165                 tps65010_set_led(LED1, OFF);
 166         }
 167
 168         omap_writew(0xffff, ULPD_SOFT_DISABLE_REQ_REG);
 169
 170         /*
 171          * Step 1: turn off interrupts (FIXME: NOTE: already disabled)
 172          */
 173
 174         local_irq_disable();
 175         local_fiq_disable();
 176
 177         /*
 178          * Step 2: save registers
 179          *
 180          * The omap is a strange/beautiful device. The caches, memory
 181          * and register state are preserved across power saves.
 182          * We have to save and restore very little register state to
 183          * idle the omap.
 184          *
 185          * Save interrupt, MPUI, ARM and UPLD control registers.
 186          */
 187
 188         if (cpu_is_omap1510()) {
 189                 MPUI1510_SAVE(OMAP_IH1_MIR);
 190                 MPUI1510_SAVE(OMAP_IH2_MIR);
 191                 MPUI1510_SAVE(MPUI_CTRL);
 192                 MPUI1510_SAVE(MPUI_DSP_BOOT_CONFIG);
 193                 MPUI1510_SAVE(MPUI_DSP_API_CONFIG);
 194                 MPUI1510_SAVE(EMIFS_CONFIG);
 195                 MPUI1510_SAVE(EMIFF_SDRAM_CONFIG);
 196         } else if (cpu_is_omap16xx()) {
 197                 MPUI1610_SAVE(OMAP_IH1_MIR);
 198                 MPUI1610_SAVE(OMAP_IH2_0_MIR);
 199                 MPUI1610_SAVE(OMAP_IH2_1_MIR);
 200                 MPUI1610_SAVE(OMAP_IH2_2_MIR);
 201                 MPUI1610_SAVE(OMAP_IH2_3_MIR);
 202                 MPUI1610_SAVE(MPUI_CTRL);
 203                 MPUI1610_SAVE(MPUI_DSP_BOOT_CONFIG);
 204                 MPUI1610_SAVE(MPUI_DSP_API_CONFIG);
 205                 MPUI1610_SAVE(EMIFS_CONFIG);
 206                 MPUI1610_SAVE(EMIFF_SDRAM_CONFIG);
 207         }
 208
 209         ARM_SAVE(ARM_CKCTL);
 210         ARM_SAVE(ARM_IDLECT1);
 211         ARM_SAVE(ARM_IDLECT2);
 212         if (!(cpu_is_omap1510()))
 213                 ARM_SAVE(ARM_IDLECT3);
 214         ARM_SAVE(ARM_EWUPCT);
 215         ARM_SAVE(ARM_RSTCT1);
 216         ARM_SAVE(ARM_RSTCT2);
 217         ARM_SAVE(ARM_SYSST);
 218         ULPD_SAVE(ULPD_CLOCK_CTRL);
 219         ULPD_SAVE(ULPD_STATUS_REQ);
 220
 221         /* (Step 3 removed - we now allow deep sleep by default) */
 222
 223         /*
 224          * Step 4: OMAP DSP Shutdown
 225          */
 226
 227
 228         /*
 229          * Step 5: Wakeup Event Setup
 230          */
 231
 232         omap_pm_wakeup_setup();
 233
 234         /*
 235          * Step 6: ARM and Traffic controller shutdown
 236          */
 237
 238         /* disable ARM watchdog */
 239         omap_writel(0x00F5, OMAP_WDT_TIMER_MODE);
 240         omap_writel(0x00A0, OMAP_WDT_TIMER_MODE);
 241
 242         /*
 243          * Step 6b: ARM and Traffic controller shutdown
 244          *
 245          * Step 6 continues here. Prepare jump to power management
 246          * assembly code in internal SRAM.
 247          *
 248          * Since the omap_cpu_suspend routine has been copied to
 249          * SRAM, we'll do an indirect procedure call to it and pass the
 250          * contents of arm_idlect1 and arm_idlect2 so it can restore
 251          * them when it wakes up and it will return.
 252          */
 253
 254         arg0 = arm_sleep_save[ARM_SLEEP_SAVE_ARM_IDLECT1];
 255         arg1 = arm_sleep_save[ARM_SLEEP_SAVE_ARM_IDLECT2];
 256
 257         /*
 258          * Step 6c: ARM and Traffic controller shutdown
 259          *
 260          * Jump to assembly code. The processor will stay there
 261          * until wake up.
 262          */
 263         omap_sram_suspend(arg0, arg1);
 264
 265         /*
 266          * If we are here, processor is woken up!
 267          */
 268
 269         /*
 270          * Restore ARM state, except ARM_IDLECT1/2 which omap_cpu_suspend did
 271          */
 272
 273         if (!(cpu_is_omap1510()))
 274                 ARM_RESTORE(ARM_IDLECT3);
 275         ARM_RESTORE(ARM_CKCTL);
 276         ARM_RESTORE(ARM_EWUPCT);
 277         ARM_RESTORE(ARM_RSTCT1);
 278         ARM_RESTORE(ARM_RSTCT2);
 279         ARM_RESTORE(ARM_SYSST);
 280         ULPD_RESTORE(ULPD_CLOCK_CTRL);
 281         ULPD_RESTORE(ULPD_STATUS_REQ);
 282
 283         if (cpu_is_omap1510()) {
 284                 MPUI1510_RESTORE(MPUI_CTRL);
 285                 MPUI1510_RESTORE(MPUI_DSP_BOOT_CONFIG);
 286                 MPUI1510_RESTORE(MPUI_DSP_API_CONFIG);
 287                 MPUI1510_RESTORE(EMIFS_CONFIG);
 288                 MPUI1510_RESTORE(EMIFF_SDRAM_CONFIG);
 289                 MPUI1510_RESTORE(OMAP_IH1_MIR);
 290                 MPUI1510_RESTORE(OMAP_IH2_MIR);
 291         } else if (cpu_is_omap16xx()) {
 292                 MPUI1610_RESTORE(MPUI_CTRL);
 293                 MPUI1610_RESTORE(MPUI_DSP_BOOT_CONFIG);
 294                 MPUI1610_RESTORE(MPUI_DSP_API_CONFIG);
 295                 MPUI1610_RESTORE(EMIFS_CONFIG);
 296                 MPUI1610_RESTORE(EMIFF_SDRAM_CONFIG);
 297
 298                 MPUI1610_RESTORE(OMAP_IH1_MIR);
 299                 MPUI1610_RESTORE(OMAP_IH2_0_MIR);
 300                 MPUI1610_RESTORE(OMAP_IH2_1_MIR);
 301                 MPUI1610_RESTORE(OMAP_IH2_2_MIR);
 302                 MPUI1610_RESTORE(OMAP_IH2_3_MIR);
 303         }
 304
 305         omap_writew(0, ULPD_SOFT_DISABLE_REQ_REG);
 306
 307         /*
 308          * Reenable interrupts
 309          */
 310
 311         local_irq_enable();
 312         local_fiq_enable();
 313
 314         omap_serial_wake_trigger(0);
 315
 316         printk("PM: OMAP%x is re-starting from deep sleep...\n", system_rev);
 317
 318         if (machine_is_omap_osk()) {
 319                 /* Let LED1 (D9) blink again */
 320                 tps65010_set_led(LED1, BLINK);
 321         }
 322 }
 323
 324 #if defined(DEBUG) && defined(CONFIG_PROC_FS)
 325 static int g_read_completed;
 326
 327 /*
 328  * Read system PM registers for debugging
 329  */
 330 static int omap_pm_read_proc(
 331         char *page_buffer,
 332         char **my_first_byte,
 333         off_t virtual_start,
 334         int length,
 335         int *eof,
 336         void *data)
 337 {
 338         int my_buffer_offset = 0;
 339         char * const my_base = page_buffer;
 340
 341         ARM_SAVE(ARM_CKCTL);
 342         ARM_SAVE(ARM_IDLECT1);
 343         ARM_SAVE(ARM_IDLECT2);
 344         if (!(cpu_is_omap1510()))
 345                 ARM_SAVE(ARM_IDLECT3);
 346         ARM_SAVE(ARM_EWUPCT);
 347         ARM_SAVE(ARM_RSTCT1);
 348         ARM_SAVE(ARM_RSTCT2);
 349         ARM_SAVE(ARM_SYSST);
 350
 351         ULPD_SAVE(ULPD_IT_STATUS);
 352         ULPD_SAVE(ULPD_CLOCK_CTRL);
 353         ULPD_SAVE(ULPD_SOFT_REQ);
 354         ULPD_SAVE(ULPD_STATUS_REQ);
 355         ULPD_SAVE(ULPD_DPLL_CTRL);
 356         ULPD_SAVE(ULPD_POWER_CTRL);
 357
 358         if (cpu_is_omap1510()) {
 359                 MPUI1510_SAVE(MPUI_CTRL);
 360                 MPUI1510_SAVE(MPUI_DSP_STATUS);
 361                 MPUI1510_SAVE(MPUI_DSP_BOOT_CONFIG);
 362                 MPUI1510_SAVE(MPUI_DSP_API_CONFIG);
 363                 MPUI1510_SAVE(EMIFF_SDRAM_CONFIG);
 364                 MPUI1510_SAVE(EMIFS_CONFIG);
 365         } else if (cpu_is_omap16xx()) {
 366                 MPUI1610_SAVE(MPUI_CTRL);
 367                 MPUI1610_SAVE(MPUI_DSP_STATUS);
 368                 MPUI1610_SAVE(MPUI_DSP_BOOT_CONFIG);
 369                 MPUI1610_SAVE(MPUI_DSP_API_CONFIG);
 370                 MPUI1610_SAVE(EMIFF_SDRAM_CONFIG);
 371                 MPUI1610_SAVE(EMIFS_CONFIG);
 372         }
 373
 374         if (virtual_start == 0) {
 375                 g_read_completed = 0;
 376
 377                 my_buffer_offset += sprintf(my_base + my_buffer_offset,
 378                    "ARM_CKCTL_REG:            0x%-8x     \n"
 379                    "ARM_IDLECT1_REG:          0x%-8x     \n"
 380                    "ARM_IDLECT2_REG:          0x%-8x     \n"
 381                    "ARM_IDLECT3_REG:          0x%-8x     \n"
 382                    "ARM_EWUPCT_REG:           0x%-8x     \n"
 383                    "ARM_RSTCT1_REG:           0x%-8x     \n"
 384                    "ARM_RSTCT2_REG:           0x%-8x     \n"
 385                    "ARM_SYSST_REG:            0x%-8x     \n"
 386                    "ULPD_IT_STATUS_REG:       0x%-4x     \n"
 387                    "ULPD_CLOCK_CTRL_REG:      0x%-4x     \n"
 388                    "ULPD_SOFT_REQ_REG:        0x%-4x     \n"
 389                    "ULPD_DPLL_CTRL_REG:       0x%-4x     \n"
 390                    "ULPD_STATUS_REQ_REG:      0x%-4x     \n"
 391                    "ULPD_POWER_CTRL_REG:      0x%-4x     \n",
 392                    ARM_SHOW(ARM_CKCTL),
 393                    ARM_SHOW(ARM_IDLECT1),
 394                    ARM_SHOW(ARM_IDLECT2),
 395                    ARM_SHOW(ARM_IDLECT3),
 396                    ARM_SHOW(ARM_EWUPCT),
 397                    ARM_SHOW(ARM_RSTCT1),
 398                    ARM_SHOW(ARM_RSTCT2),
 399                    ARM_SHOW(ARM_SYSST),
 400                    ULPD_SHOW(ULPD_IT_STATUS),
 401                    ULPD_SHOW(ULPD_CLOCK_CTRL),
 402                    ULPD_SHOW(ULPD_SOFT_REQ),
 403                    ULPD_SHOW(ULPD_DPLL_CTRL),
 404                    ULPD_SHOW(ULPD_STATUS_REQ),
 405                    ULPD_SHOW(ULPD_POWER_CTRL));
 406
 407                 if (cpu_is_omap1510()) {
 408                         my_buffer_offset += sprintf(my_base + my_buffer_offset,
 409                            "MPUI1510_CTRL_REG             0x%-8x \n"
 410                            "MPUI1510_DSP_STATUS_REG:      0x%-8x \n"
 411                            "MPUI1510_DSP_BOOT_CONFIG_REG: 0x%-8x \n"
 412                            "MPUI1510_DSP_API_CONFIG_REG:  0x%-8x \n"
 413                            "MPUI1510_SDRAM_CONFIG_REG:    0x%-8x \n"
 414                            "MPUI1510_EMIFS_CONFIG_REG:    0x%-8x \n",
 415                            MPUI1510_SHOW(MPUI_CTRL),
 416                            MPUI1510_SHOW(MPUI_DSP_STATUS),
 417                            MPUI1510_SHOW(MPUI_DSP_BOOT_CONFIG),
 418                            MPUI1510_SHOW(MPUI_DSP_API_CONFIG),
 419                            MPUI1510_SHOW(EMIFF_SDRAM_CONFIG),
 420                            MPUI1510_SHOW(EMIFS_CONFIG));
 421                 } else if (cpu_is_omap16xx()) {
 422                         my_buffer_offset += sprintf(my_base + my_buffer_offset,
 423                            "MPUI1610_CTRL_REG             0x%-8x \n"
 424                            "MPUI1610_DSP_STATUS_REG:      0x%-8x \n"
 425                            "MPUI1610_DSP_BOOT_CONFIG_REG: 0x%-8x \n"
 426                            "MPUI1610_DSP_API_CONFIG_REG:  0x%-8x \n"
 427                            "MPUI1610_SDRAM_CONFIG_REG:    0x%-8x \n"
 428                            "MPUI1610_EMIFS_CONFIG_REG:    0x%-8x \n",
 429                            MPUI1610_SHOW(MPUI_CTRL),
 430                            MPUI1610_SHOW(MPUI_DSP_STATUS),
 431                            MPUI1610_SHOW(MPUI_DSP_BOOT_CONFIG),
 432                            MPUI1610_SHOW(MPUI_DSP_API_CONFIG),
 433                            MPUI1610_SHOW(EMIFF_SDRAM_CONFIG),
 434                            MPUI1610_SHOW(EMIFS_CONFIG));
 435                 }
 436
 437                 g_read_completed++;
 438         } else if (g_read_completed >= 1) {
 439                  *eof = 1;
 440                  return 0;
 441         }
 442         g_read_completed++;
 443
 444         *my_first_byte = page_buffer;
 445         return  my_buffer_offset;
 446 }
 447
 448 static void omap_pm_init_proc(void)
 449 {
 450         struct proc_dir_entry *entry;
 451
 452         entry = create_proc_read_entry("driver/omap_pm",
 453                                        S_IWUSR | S_IRUGO, NULL,
 454            omap_pm_read_proc, NULL);
 455 }
 456
 457 #endif /* DEBUG && CONFIG_PROC_FS */
 458
 459 /*
 460  *      omap_pm_prepare - Do preliminary suspend work.
 461  *      @state:         suspend state we're entering.
 462  *
 463  */
 464 //#include <asm/arch/hardware.h>
 465
 466 static int omap_pm_prepare(suspend_state_t state)
 467 {
 468         int error = 0;
 469
 470         switch (state)
 471         {
 472         case PM_SUSPEND_STANDBY:
 473         case PM_SUSPEND_MEM:
 474                 break;
 475
 476         case PM_SUSPEND_DISK:
 477                 return -ENOTSUPP;
 478
 479         default:
 480                 return -EINVAL;
 481         }
 482
 483         return error;
 484 }
 485
 486
 487 /*
 488  *      omap_pm_enter - Actually enter a sleep state.
 489  *      @state:         State we're entering.
 490  *
 491  */
 492
 493 static int omap_pm_enter(suspend_state_t state)
 494 {
 495         switch (state)
 496         {
 497         case PM_SUSPEND_STANDBY:
 498         case PM_SUSPEND_MEM:
 499                 omap_pm_suspend();
 500                 break;
 501
 502         case PM_SUSPEND_DISK:
 503                 return -ENOTSUPP;
 504
 505         default:
 506                 return -EINVAL;
 507         }
 508
 509         return 0;
 510 }
 511
 512
 513 /**
 514  *      omap_pm_finish - Finish up suspend sequence.
 515  *      @state:         State we're coming out of.
 516  *
 517  *      This is called after we wake back up (or if entering the sleep state
 518  *      failed).
 519  */
 520
 521 static int omap_pm_finish(suspend_state_t state)
 522 {
 523         return 0;
 524 }
 525
 526
 527 static irqreturn_t  omap_wakeup_interrupt(int  irq, void *  dev,
 528                                      struct pt_regs *  regs)
 529 {
 530         return IRQ_HANDLED;
 531 }
 532
 533 static struct irqaction omap_wakeup_irq = {
 534         .name           = "peripheral wakeup",
 535         .flags          = SA_INTERRUPT,
 536         .handler        = omap_wakeup_interrupt
 537 };
 538
 539
 540
 541 static struct pm_ops omap_pm_ops ={
 542         .pm_disk_mode = 0,
 543         .prepare        = omap_pm_prepare,
 544         .enter          = omap_pm_enter,
 545         .finish         = omap_pm_finish,
 546 };
 547
 548 static int __init omap_pm_init(void)
 549 {
 550         printk("Power Management for TI OMAP.\n");
 551         /*
 552          * We copy the assembler sleep/wakeup routines to SRAM.
 553          * These routines need to be in SRAM as that's the only
 554          * memory the MPU can see when it wakes up.
 555          */
 556         if (cpu_is_omap1510()) {
 557                 omap_sram_idle = omap_sram_push(omap1510_idle_loop_suspend,
 558                                                 omap1510_idle_loop_suspend_sz);
 559                 omap_sram_suspend = omap_sram_push(omap1510_cpu_suspend,
 560                                                    omap1510_cpu_suspend_sz);
 561         } else if (cpu_is_omap16xx()) {
 562                 omap_sram_idle = omap_sram_push(omap1610_idle_loop_suspend,
 563                                                 omap1610_idle_loop_suspend_sz);
 564                 omap_sram_suspend = omap_sram_push(omap1610_cpu_suspend,
 565                                                    omap1610_cpu_suspend_sz);
 566         }
 567
 568         if (omap_sram_idle == NULL || omap_sram_suspend == NULL) {
 569                 printk(KERN_ERR "PM not initialized: Missing SRAM support\n");
 570                 return -ENODEV;
 571         }
 572
 573         pm_idle = omap_pm_idle;
 574
 575         setup_irq(INT_1610_WAKE_UP_REQ, &omap_wakeup_irq);
 576 #if 0
 577         /* --- BEGIN BOARD-DEPENDENT CODE --- */
 578         /* Sleepx mask direction */
 579         omap_writew((omap_readw(0xfffb5008) & ~2), 0xfffb5008);
 580         /* Unmask sleepx signal */
 581         omap_writew((omap_readw(0xfffb5004) & ~2), 0xfffb5004);
 582         /* --- END BOARD-DEPENDENT CODE --- */
 583 #endif
 584
 585         /* Program new power ramp-up time
 586          * (0 for most boards since we don't lower voltage when in deep sleep)
 587          */
 588         omap_writew(ULPD_SETUP_ANALOG_CELL_3_VAL, ULPD_SETUP_ANALOG_CELL_3);
 589
 590         /* Setup ULPD POWER_CTRL_REG - enter deep sleep whenever possible */
 591         omap_writew(ULPD_POWER_CTRL_REG_VAL, ULPD_POWER_CTRL);
 592
 593         /* Configure IDLECT3 */
 594         if (cpu_is_omap16xx())
 595                 omap_writel(OMAP1610_IDLECT3_VAL, OMAP1610_IDLECT3);
 596
 597         pm_set_ops(&omap_pm_ops);
 598
 599 #if defined(DEBUG) && defined(CONFIG_PROC_FS)
 600         omap_pm_init_proc();
 601 #endif
 602
 603         /* configure LOW_PWR pin */
 604         omap_cfg_reg(T20_1610_LOW_PWR);
 605
 606         return 0;
 607 }
 608 __initcall(omap_pm_init);
 609