arch/arm/mach-omap2/pm34xx.c

   1 /*
   2  * OMAP3 Power Management Routines
   3  *
   4  * Copyright (C) 2006-2008 Nokia Corporation
   5  * Tony Lindgren <tony@atomide.com>
   6  * Jouni Hogander
   7  *
   8  * Copyright (C) 2007 Texas Instruments, Inc.
   9  * Rajendra Nayak <rnayak@ti.com>
  10  *
  11  * Copyright (C) 2005 Texas Instruments, Inc.
  12  * Richard Woodruff <r-woodruff2@ti.com>
  13  *
  14  * Based on pm.c for omap1
  15  *
  16  * This program is free software; you can redistribute it and/or modify
  17  * it under the terms of the GNU General Public License version 2 as
  18  * published by the Free Software Foundation.
  19  */
  20
  21 #include <linux/pm.h>
  22 #include <linux/suspend.h>
  23 #include <linux/interrupt.h>
  24 #include <linux/module.h>
  25 #include <linux/list.h>
  26 #include <linux/err.h>
  27 #include <linux/gpio.h>
  28 #include <linux/clk.h>
  29 #include <linux/delay.h>
  30 #include <linux/slab.h>
  31
  32 #include <plat/sram.h>
  33 #include <plat/clockdomain.h>
  34 #include <plat/powerdomain.h>
  35 #include <plat/control.h>
  36 #include <plat/serial.h>
  37 #include <plat/sdrc.h>
  38 #include <plat/prcm.h>
  39 #include <plat/gpmc.h>
  40 #include <plat/dma.h>
  41 #include <plat/dmtimer.h>
  42
  43 #include <asm/tlbflush.h>
  44
  45 #include "cm.h"
  46 #include "cm-regbits-34xx.h"
  47 #include "prm-regbits-34xx.h"
  48
  49 #include "prm.h"
  50 #include "pm.h"
  51 #include "sdrc.h"
  52
  53 /* Scratchpad offsets */
  54 #define OMAP343X_TABLE_ADDRESS_OFFSET      0x31
  55 #define OMAP343X_TABLE_VALUE_OFFSET        0x30
  56 #define OMAP343X_CONTROL_REG_VALUE_OFFSET  0x32
  57
  58 u32 enable_off_mode;
  59 u32 sleep_while_idle;
  60 u32 wakeup_timer_seconds;
  61 u32 wakeup_timer_milliseconds;
  62
  63 struct power_state {
  64         struct powerdomain *pwrdm;
  65         u32 next_state;
  66 #ifdef CONFIG_SUSPEND
  67         u32 saved_state;
  68 #endif
  69         struct list_head node;
  70 };
  71
  72 static LIST_HEAD(pwrst_list);
  73
  74 static void (*_omap_sram_idle)(u32 *addr, int save_state);
  75
  76 static int (*_omap_save_secure_sram)(u32 *addr);
  77
  78 static struct powerdomain *mpu_pwrdm, *neon_pwrdm;
  79 static struct powerdomain *core_pwrdm, *per_pwrdm;
  80 static struct powerdomain *cam_pwrdm;
  81
  82 static inline void omap3_per_save_context(void)
  83 {
  84         omap_gpio_save_context();
  85 }
  86
  87 static inline void omap3_per_restore_context(void)
  88 {
  89         omap_gpio_restore_context();
  90 }
  91
  92 static void omap3_enable_io_chain(void)
  93 {
  94         int timeout = 0;
  95
  96         if (omap_rev() >= OMAP3430_REV_ES3_1) {
  97                 prm_set_mod_reg_bits(OMAP3430_EN_IO_CHAIN_MASK, WKUP_MOD,
  98                                      PM_WKEN);
  99                 /* Do a readback to assure write has been done */
 100                 prm_read_mod_reg(WKUP_MOD, PM_WKEN);
 101
 102                 while (!(prm_read_mod_reg(WKUP_MOD, PM_WKST) &
 103                          OMAP3430_ST_IO_CHAIN_MASK)) {
 104                         timeout++;
 105                         if (timeout > 1000) {
 106                                 printk(KERN_ERR "Wake up daisy chain "
 107                                        "activation failed.\n");
 108                                 return;
 109                         }
 110                         prm_set_mod_reg_bits(OMAP3430_ST_IO_CHAIN_MASK,
 111                                              WKUP_MOD, PM_WKST);
 112                 }
 113         }
 114 }
 115
 116 static void omap3_disable_io_chain(void)
 117 {
 118         if (omap_rev() >= OMAP3430_REV_ES3_1)
 119                 prm_clear_mod_reg_bits(OMAP3430_EN_IO_CHAIN_MASK, WKUP_MOD,
 120                                        PM_WKEN);
 121 }
 122
 123 static void omap3_core_save_context(void)
 124 {
 125         u32 control_padconf_off;
 126
 127         /* Save the padconf registers */
 128         control_padconf_off = omap_ctrl_readl(OMAP343X_CONTROL_PADCONF_OFF);
 129         control_padconf_off |= START_PADCONF_SAVE;
 130         omap_ctrl_writel(control_padconf_off, OMAP343X_CONTROL_PADCONF_OFF);
 131         /* wait for the save to complete */
 132         while (!(omap_ctrl_readl(OMAP343X_CONTROL_GENERAL_PURPOSE_STATUS)
 133                         & PADCONF_SAVE_DONE))
 134                 udelay(1);
 135
 136         /*
 137          * Force write last pad into memory, as this can fail in some
 138          * cases according to erratas 1.157, 1.185
 139          */
 140         omap_ctrl_writel(omap_ctrl_readl(OMAP343X_PADCONF_ETK_D14),
 141                 OMAP343X_CONTROL_MEM_WKUP + 0x2a0);
 142
 143         /* Save the Interrupt controller context */
 144         omap_intc_save_context();
 145         /* Save the GPMC context */
 146         omap3_gpmc_save_context();
 147         /* Save the system control module context, padconf already save above*/
 148         omap3_control_save_context();
 149         omap_dma_global_context_save();
 150 }
 151
 152 static void omap3_core_restore_context(void)
 153 {
 154         /* Restore the control module context, padconf restored by h/w */
 155         omap3_control_restore_context();
 156         /* Restore the GPMC context */
 157         omap3_gpmc_restore_context();
 158         /* Restore the interrupt controller context */
 159         omap_intc_restore_context();
 160         omap_dma_global_context_restore();
 161 }
 162
 163 /*
 164  * FIXME: This function should be called before entering off-mode after
 165  * OMAP3 secure services have been accessed. Currently it is only called
 166  * once during boot sequence, but this works as we are not using secure
 167  * services.
 168  */
 169 static void omap3_save_secure_ram_context(u32 target_mpu_state)
 170 {
 171         u32 ret;
 172
 173         if (omap_type() != OMAP2_DEVICE_TYPE_GP) {
 174                 /*
 175                  * MPU next state must be set to POWER_ON temporarily,
 176                  * otherwise the WFI executed inside the ROM code
 177                  * will hang the system.
 178                  */
 179                 pwrdm_set_next_pwrst(mpu_pwrdm, PWRDM_POWER_ON);
 180                 ret = _omap_save_secure_sram((u32 *)
 181                                 __pa(omap3_secure_ram_storage));
 182                 pwrdm_set_next_pwrst(mpu_pwrdm, target_mpu_state);
 183                 /* Following is for error tracking, it should not happen */
 184                 if (ret) {
 185                         printk(KERN_ERR "save_secure_sram() returns %08x\n",
 186                                 ret);
 187                         while (1)
 188                                 ;
 189                 }
 190         }
 191 }
 192
 193 /*
 194  * PRCM Interrupt Handler Helper Function
 195  *
 196  * The purpose of this function is to clear any wake-up events latched
 197  * in the PRCM PM_WKST_x registers. It is possible that a wake-up event
 198  * may occur whilst attempting to clear a PM_WKST_x register and thus
 199  * set another bit in this register. A while loop is used to ensure
 200  * that any peripheral wake-up events occurring while attempting to
 201  * clear the PM_WKST_x are detected and cleared.
 202  */
 203 static int prcm_clear_mod_irqs(s16 module, u8 regs)
 204 {
 205         u32 wkst, fclk, iclk, clken;
 206         u16 wkst_off = (regs == 3) ? OMAP3430ES2_PM_WKST3 : PM_WKST1;
 207         u16 fclk_off = (regs == 3) ? OMAP3430ES2_CM_FCLKEN3 : CM_FCLKEN1;
 208         u16 iclk_off = (regs == 3) ? CM_ICLKEN3 : CM_ICLKEN1;
 209         u16 grpsel_off = (regs == 3) ?
 210                 OMAP3430ES2_PM_MPUGRPSEL3 : OMAP3430_PM_MPUGRPSEL;
 211         int c = 0;
 212
 213         wkst = prm_read_mod_reg(module, wkst_off);
 214         wkst &= prm_read_mod_reg(module, grpsel_off);
 215         if (wkst) {
 216                 iclk = cm_read_mod_reg(module, iclk_off);
 217                 fclk = cm_read_mod_reg(module, fclk_off);
 218                 while (wkst) {
 219                         clken = wkst;
 220                         cm_set_mod_reg_bits(clken, module, iclk_off);
 221                         /*
 222                          * For USBHOST, we don't know whether HOST1 or
 223                          * HOST2 woke us up, so enable both f-clocks
 224                          */
 225                         if (module == OMAP3430ES2_USBHOST_MOD)
 226                                 clken |= 1 << OMAP3430ES2_EN_USBHOST2_SHIFT;
 227                         cm_set_mod_reg_bits(clken, module, fclk_off);
 228                         prm_write_mod_reg(wkst, module, wkst_off);
 229                         wkst = prm_read_mod_reg(module, wkst_off);
 230                         c++;
 231                 }
 232                 cm_write_mod_reg(iclk, module, iclk_off);
 233                 cm_write_mod_reg(fclk, module, fclk_off);
 234         }
 235
 236         return c;
 237 }
 238
 239 static int _prcm_int_handle_wakeup(void)
 240 {
 241         int c;
 242
 243         c = prcm_clear_mod_irqs(WKUP_MOD, 1);
 244         c += prcm_clear_mod_irqs(CORE_MOD, 1);
 245         c += prcm_clear_mod_irqs(OMAP3430_PER_MOD, 1);
 246         if (omap_rev() > OMAP3430_REV_ES1_0) {
 247                 c += prcm_clear_mod_irqs(CORE_MOD, 3);
 248                 c += prcm_clear_mod_irqs(OMAP3430ES2_USBHOST_MOD, 1);
 249         }
 250
 251         return c;
 252 }
 253
 254 /*
 255  * PRCM Interrupt Handler
 256  *
 257  * The PRM_IRQSTATUS_MPU register indicates if there are any pending
 258  * interrupts from the PRCM for the MPU. These bits must be cleared in
 259  * order to clear the PRCM interrupt. The PRCM interrupt handler is
 260  * implemented to simply clear the PRM_IRQSTATUS_MPU in order to clear
 261  * the PRCM interrupt. Please note that bit 0 of the PRM_IRQSTATUS_MPU
 262  * register indicates that a wake-up event is pending for the MPU and
 263  * this bit can only be cleared if the all the wake-up events latched
 264  * in the various PM_WKST_x registers have been cleared. The interrupt
 265  * handler is implemented using a do-while loop so that if a wake-up
 266  * event occurred during the processing of the prcm interrupt handler
 267  * (setting a bit in the corresponding PM_WKST_x register and thus
 268  * preventing us from clearing bit 0 of the PRM_IRQSTATUS_MPU register)
 269  * this would be handled.
 270  */
 271 static irqreturn_t prcm_interrupt_handler (int irq, void *dev_id)
 272 {
 273         u32 irqenable_mpu, irqstatus_mpu;
 274         int c = 0;
 275
 276         irqenable_mpu = prm_read_mod_reg(OCP_MOD,
 277                                          OMAP3_PRM_IRQENABLE_MPU_OFFSET);
 278         irqstatus_mpu = prm_read_mod_reg(OCP_MOD,
 279                                          OMAP3_PRM_IRQSTATUS_MPU_OFFSET);
 280         irqstatus_mpu &= irqenable_mpu;
 281
 282         do {
 283                 if (irqstatus_mpu & (OMAP3430_WKUP_ST_MASK |
 284                                      OMAP3430_IO_ST_MASK)) {
 285                         c = _prcm_int_handle_wakeup();
 286
 287                         /*
 288                          * Is the MPU PRCM interrupt handler racing with the
 289                          * IVA2 PRCM interrupt handler ?
 290                          */
 291                         WARN(c == 0, "prcm: WARNING: PRCM indicated MPU wakeup "
 292                              "but no wakeup sources are marked\n");
 293                 } else {
 294                         /* XXX we need to expand our PRCM interrupt handler */
 295                         WARN(1, "prcm: WARNING: PRCM interrupt received, but "
 296                              "no code to handle it (%08x)\n", irqstatus_mpu);
 297                 }
 298
 299                 prm_write_mod_reg(irqstatus_mpu, OCP_MOD,
 300                                         OMAP3_PRM_IRQSTATUS_MPU_OFFSET);
 301
 302                 irqstatus_mpu = prm_read_mod_reg(OCP_MOD,
 303                                         OMAP3_PRM_IRQSTATUS_MPU_OFFSET);
 304                 irqstatus_mpu &= irqenable_mpu;
 305
 306         } while (irqstatus_mpu);
 307
 308         return IRQ_HANDLED;
 309 }
 310
 311 static void restore_control_register(u32 val)
 312 {
 313         __asm__ __volatile__ ("mcr p15, 0, %0, c1, c0, 0" : : "r" (val));
 314 }
 315
 316 /* Function to restore the table entry that was modified for enabling MMU */
 317 static void restore_table_entry(void)
 318 {
 319         u32 *scratchpad_address;
 320         u32 previous_value, control_reg_value;
 321         u32 *address;
 322
 323         scratchpad_address = OMAP2_L4_IO_ADDRESS(OMAP343X_SCRATCHPAD);
 324
 325         /* Get address of entry that was modified */
 326         address = (u32 *)__raw_readl(scratchpad_address +
 327                                      OMAP343X_TABLE_ADDRESS_OFFSET);
 328         /* Get the previous value which needs to be restored */
 329         previous_value = __raw_readl(scratchpad_address +
 330                                      OMAP343X_TABLE_VALUE_OFFSET);
 331         address = __va(address);
 332         *address = previous_value;
 333         flush_tlb_all();
 334         control_reg_value = __raw_readl(scratchpad_address
 335                                         + OMAP343X_CONTROL_REG_VALUE_OFFSET);
 336         /* This will enable caches and prediction */
 337         restore_control_register(control_reg_value);
 338 }
 339
 340 void omap_sram_idle(void)
 341 {
 342         /* Variable to tell what needs to be saved and restored
 343          * in omap_sram_idle*/
 344         /* save_state = 0 => Nothing to save and restored */
 345         /* save_state = 1 => Only L1 and logic lost */
 346         /* save_state = 2 => Only L2 lost */
 347         /* save_state = 3 => L1, L2 and logic lost */
 348         int save_state = 0;
 349         int mpu_next_state = PWRDM_POWER_ON;
 350         int per_next_state = PWRDM_POWER_ON;
 351         int core_next_state = PWRDM_POWER_ON;
 352         int core_prev_state, per_prev_state;
 353         u32 sdrc_pwr = 0;
 354         int per_state_modified = 0;
 355
 356         if (!_omap_sram_idle)
 357                 return;
 358
 359         pwrdm_clear_all_prev_pwrst(mpu_pwrdm);
 360         pwrdm_clear_all_prev_pwrst(neon_pwrdm);
 361         pwrdm_clear_all_prev_pwrst(core_pwrdm);
 362         pwrdm_clear_all_prev_pwrst(per_pwrdm);
 363
 364         mpu_next_state = pwrdm_read_next_pwrst(mpu_pwrdm);
 365         switch (mpu_next_state) {
 366         case PWRDM_POWER_ON:
 367         case PWRDM_POWER_RET:
 368                 /* No need to save context */
 369                 save_state = 0;
 370                 break;
 371         case PWRDM_POWER_OFF:
 372                 save_state = 3;
 373                 break;
 374         default:
 375                 /* Invalid state */
 376                 printk(KERN_ERR "Invalid mpu state in sram_idle\n");
 377                 return;
 378         }
 379         pwrdm_pre_transition();
 380
 381         /* NEON control */
 382         if (pwrdm_read_pwrst(neon_pwrdm) == PWRDM_POWER_ON)
 383                 pwrdm_set_next_pwrst(neon_pwrdm, mpu_next_state);
 384
 385         /* Enable IO-PAD and IO-CHAIN wakeups */
 386         per_next_state = pwrdm_read_next_pwrst(per_pwrdm);
 387         core_next_state = pwrdm_read_next_pwrst(core_pwrdm);
 388         if (per_next_state < PWRDM_POWER_ON ||
 389                         core_next_state < PWRDM_POWER_ON) {
 390                 prm_set_mod_reg_bits(OMAP3430_EN_IO_MASK, WKUP_MOD, PM_WKEN);
 391                 omap3_enable_io_chain();
 392         }
 393
 394         /* PER */
 395         if (per_next_state < PWRDM_POWER_ON) {
 396                 omap_uart_prepare_idle(2);
 397                 omap2_gpio_prepare_for_idle(per_next_state);
 398                 if (per_next_state == PWRDM_POWER_OFF) {
 399                         if (core_next_state == PWRDM_POWER_ON) {
 400                                 per_next_state = PWRDM_POWER_RET;
 401                                 pwrdm_set_next_pwrst(per_pwrdm, per_next_state);
 402                                 per_state_modified = 1;
 403                         } else
 404                                 omap3_per_save_context();
 405                 }
 406         }
 407
 408         if (pwrdm_read_pwrst(cam_pwrdm) == PWRDM_POWER_ON)
 409                 omap2_clkdm_deny_idle(mpu_pwrdm->pwrdm_clkdms[0]);
 410
 411         /* CORE */
 412         if (core_next_state < PWRDM_POWER_ON) {
 413                 omap_uart_prepare_idle(0);
 414                 omap_uart_prepare_idle(1);
 415                 if (core_next_state == PWRDM_POWER_OFF) {
 416                         omap3_core_save_context();
 417                         omap3_prcm_save_context();
 418                 }
 419         }
 420
 421         omap3_intc_prepare_idle();
 422
 423         /*
 424         * On EMU/HS devices ROM code restores a SRDC value
 425         * from scratchpad which has automatic self refresh on timeout
 426         * of AUTO_CNT = 1 enabled. This takes care of errata 1.142.
 427         * Hence store/restore the SDRC_POWER register here.
 428         */
 429         if (omap_rev() >= OMAP3430_REV_ES3_0 &&
 430             omap_type() != OMAP2_DEVICE_TYPE_GP &&
 431             core_next_state == PWRDM_POWER_OFF)
 432                 sdrc_pwr = sdrc_read_reg(SDRC_POWER);
 433
 434         /*
 435          * omap3_arm_context is the location where ARM registers
 436          * get saved. The restore path then reads from this
 437          * location and restores them back.
 438          */
 439         _omap_sram_idle(omap3_arm_context, save_state);
 440         cpu_init();
 441
 442         /* Restore normal SDRC POWER settings */
 443         if (omap_rev() >= OMAP3430_REV_ES3_0 &&
 444             omap_type() != OMAP2_DEVICE_TYPE_GP &&
 445             core_next_state == PWRDM_POWER_OFF)
 446                 sdrc_write_reg(sdrc_pwr, SDRC_POWER);
 447
 448         /* Restore table entry modified during MMU restoration */
 449         if (pwrdm_read_prev_pwrst(mpu_pwrdm) == PWRDM_POWER_OFF)
 450                 restore_table_entry();
 451
 452         /* CORE */
 453         if (core_next_state < PWRDM_POWER_ON) {
 454                 core_prev_state = pwrdm_read_prev_pwrst(core_pwrdm);
 455                 if (core_prev_state == PWRDM_POWER_OFF) {
 456                         omap3_core_restore_context();
 457                         omap3_prcm_restore_context();
 458                         omap3_sram_restore_context();
 459                         omap2_sms_restore_context();
 460                 }
 461                 omap_uart_resume_idle(0);
 462                 omap_uart_resume_idle(1);
 463                 if (core_next_state == PWRDM_POWER_OFF)
 464                         prm_clear_mod_reg_bits(OMAP3430_AUTO_OFF_MASK,
 465                                                OMAP3430_GR_MOD,
 466                                                OMAP3_PRM_VOLTCTRL_OFFSET);
 467         }
 468         omap3_intc_resume_idle();
 469
 470         /* PER */
 471         if (per_next_state < PWRDM_POWER_ON) {
 472                 per_prev_state = pwrdm_read_prev_pwrst(per_pwrdm);
 473                 omap2_gpio_resume_after_idle();
 474                 if (per_prev_state == PWRDM_POWER_OFF)
 475                         omap3_per_restore_context();
 476                 omap_uart_resume_idle(2);
 477                 if (per_state_modified)
 478                         pwrdm_set_next_pwrst(per_pwrdm, PWRDM_POWER_OFF);
 479         }
 480
 481         /* Disable IO-PAD and IO-CHAIN wakeup */
 482         if (core_next_state < PWRDM_POWER_ON) {
 483                 prm_clear_mod_reg_bits(OMAP3430_EN_IO_MASK, WKUP_MOD, PM_WKEN);
 484                 omap3_disable_io_chain();
 485         }
 486
 487         pwrdm_post_transition();
 488
 489         omap2_clkdm_allow_idle(mpu_pwrdm->pwrdm_clkdms[0]);
 490 }
 491
 492 int omap3_can_sleep(void)
 493 {
 494         if (!sleep_while_idle)
 495                 return 0;
 496         if (!omap_uart_can_sleep())
 497                 return 0;
 498         return 1;
 499 }
 500
 501 /* This sets pwrdm state (other than mpu & core. Currently only ON &
 502  * RET are supported. Function is assuming that clkdm doesn't have
 503  * hw_sup mode enabled. */
 504 int set_pwrdm_state(struct powerdomain *pwrdm, u32 state)
 505 {
 506         u32 cur_state;
 507         int sleep_switch = 0;
 508         int ret = 0;
 509
 510         if (pwrdm == NULL || IS_ERR(pwrdm))
 511                 return -EINVAL;
 512
 513         while (!(pwrdm->pwrsts & (1 << state))) {
 514                 if (state == PWRDM_POWER_OFF)
 515                         return ret;
 516                 state--;
 517         }
 518
 519         cur_state = pwrdm_read_next_pwrst(pwrdm);
 520         if (cur_state == state)
 521                 return ret;
 522
 523         if (pwrdm_read_pwrst(pwrdm) < PWRDM_POWER_ON) {
 524                 omap2_clkdm_wakeup(pwrdm->pwrdm_clkdms[0]);
 525                 sleep_switch = 1;
 526                 pwrdm_wait_transition(pwrdm);
 527         }
 528
 529         ret = pwrdm_set_next_pwrst(pwrdm, state);
 530         if (ret) {
 531                 printk(KERN_ERR "Unable to set state of powerdomain: %s\n",
 532                        pwrdm->name);
 533                 goto err;
 534         }
 535
 536         if (sleep_switch) {
 537                 omap2_clkdm_allow_idle(pwrdm->pwrdm_clkdms[0]);
 538                 pwrdm_wait_transition(pwrdm);
 539                 pwrdm_state_switch(pwrdm);
 540         }
 541
 542 err:
 543         return ret;
 544 }
 545
 546 static void omap3_pm_idle(void)
 547 {
 548         local_irq_disable();
 549         local_fiq_disable();
 550
 551         if (!omap3_can_sleep())
 552                 goto out;
 553
 554         if (omap_irq_pending() || need_resched())
 555                 goto out;
 556
 557         omap_sram_idle();
 558
 559 out:
 560         local_fiq_enable();
 561         local_irq_enable();
 562 }
 563
 564 #ifdef CONFIG_SUSPEND
 565 static suspend_state_t suspend_state;
 566
 567 static void omap2_pm_wakeup_on_timer(u32 seconds, u32 milliseconds)
 568 {
 569         u32 tick_rate, cycles;
 570
 571         if (!seconds && !milliseconds)
 572                 return;
 573
 574         tick_rate = clk_get_rate(omap_dm_timer_get_fclk(gptimer_wakeup));
 575         cycles = tick_rate * seconds + tick_rate * milliseconds / 1000;
 576         omap_dm_timer_stop(gptimer_wakeup);
 577         omap_dm_timer_set_load_start(gptimer_wakeup, 0, 0xffffffff - cycles);
 578
 579         pr_info("PM: Resume timer in %u.%03u secs"
 580                 " (%d ticks at %d ticks/sec.)\n",
 581                 seconds, milliseconds, cycles, tick_rate);
 582 }
 583
 584 static int omap3_pm_prepare(void)
 585 {
 586         disable_hlt();
 587         return 0;
 588 }
 589
 590 static int omap3_pm_suspend(void)
 591 {
 592         struct power_state *pwrst;
 593         int state, ret = 0;
 594
 595         if (wakeup_timer_seconds || wakeup_timer_milliseconds)
 596                 omap2_pm_wakeup_on_timer(wakeup_timer_seconds,
 597                                          wakeup_timer_milliseconds);
 598
 599         /* Read current next_pwrsts */
 600         list_for_each_entry(pwrst, &pwrst_list, node)
 601                 pwrst->saved_state = pwrdm_read_next_pwrst(pwrst->pwrdm);
 602         /* Set ones wanted by suspend */
 603         list_for_each_entry(pwrst, &pwrst_list, node) {
 604                 if (set_pwrdm_state(pwrst->pwrdm, pwrst->next_state))
 605                         goto restore;
 606                 if (pwrdm_clear_all_prev_pwrst(pwrst->pwrdm))
 607                         goto restore;
 608         }
 609
 610         omap_uart_prepare_suspend();
 611         omap3_intc_suspend();
 612
 613         omap_sram_idle();
 614
 615 restore:
 616         /* Restore next_pwrsts */
 617         list_for_each_entry(pwrst, &pwrst_list, node) {
 618                 state = pwrdm_read_prev_pwrst(pwrst->pwrdm);
 619                 if (state > pwrst->next_state) {
 620                         printk(KERN_INFO "Powerdomain (%s) didn't enter "
 621                                "target state %d\n",
 622                                pwrst->pwrdm->name, pwrst->next_state);
 623                         ret = -1;
 624                 }
 625                 set_pwrdm_state(pwrst->pwrdm, pwrst->saved_state);
 626         }
 627         if (ret)
 628                 printk(KERN_ERR "Could not enter target state in pm_suspend\n");
 629         else
 630                 printk(KERN_INFO "Successfully put all powerdomains "
 631                        "to target state\n");
 632
 633         return ret;
 634 }
 635
 636 static int omap3_pm_enter(suspend_state_t unused)
 637 {
 638         int ret = 0;
 639
 640         switch (suspend_state) {
 641         case PM_SUSPEND_STANDBY:
 642         case PM_SUSPEND_MEM:
 643                 ret = omap3_pm_suspend();
 644                 break;
 645         default:
 646                 ret = -EINVAL;
 647         }
 648
 649         return ret;
 650 }
 651
 652 static void omap3_pm_finish(void)
 653 {
 654         enable_hlt();
 655 }
 656
 657 /* Hooks to enable / disable UART interrupts during suspend */
 658 static int omap3_pm_begin(suspend_state_t state)
 659 {
 660         suspend_state = state;
 661         omap_uart_enable_irqs(0);
 662         return 0;
 663 }
 664
 665 static void omap3_pm_end(void)
 666 {
 667         suspend_state = PM_SUSPEND_ON;
 668         omap_uart_enable_irqs(1);
 669         return;
 670 }
 671
 672 static struct platform_suspend_ops omap_pm_ops = {
 673         .begin          = omap3_pm_begin,
 674         .end            = omap3_pm_end,
 675         .prepare        = omap3_pm_prepare,
 676         .enter          = omap3_pm_enter,
 677         .finish         = omap3_pm_finish,
 678         .valid          = suspend_valid_only_mem,
 679 };
 680 #endif /* CONFIG_SUSPEND */
 681
 682
 683 /**
 684  * omap3_iva_idle(): ensure IVA is in idle so it can be put into
 685  *                   retention
 686  *
 687  * In cases where IVA2 is activated by bootcode, it may prevent
 688  * full-chip retention or off-mode because it is not idle.  This
 689  * function forces the IVA2 into idle state so it can go
 690  * into retention/off and thus allow full-chip retention/off.
 691  *
 692  **/
 693 static void __init omap3_iva_idle(void)
 694 {
 695         /* ensure IVA2 clock is disabled */
 696         cm_write_mod_reg(0, OMAP3430_IVA2_MOD, CM_FCLKEN);
 697
 698         /* if no clock activity, nothing else to do */
 699         if (!(cm_read_mod_reg(OMAP3430_IVA2_MOD, OMAP3430_CM_CLKSTST) &
 700               OMAP3430_CLKACTIVITY_IVA2_MASK))
 701                 return;
 702
 703         /* Reset IVA2 */
 704         prm_write_mod_reg(OMAP3430_RST1_IVA2_MASK |
 705                           OMAP3430_RST2_IVA2_MASK |
 706                           OMAP3430_RST3_IVA2_MASK,
 707                           OMAP3430_IVA2_MOD, OMAP2_RM_RSTCTRL);
 708
 709         /* Enable IVA2 clock */
 710         cm_write_mod_reg(OMAP3430_CM_FCLKEN_IVA2_EN_IVA2_MASK,
 711                          OMAP3430_IVA2_MOD, CM_FCLKEN);
 712
 713         /* Set IVA2 boot mode to 'idle' */
 714         omap_ctrl_writel(OMAP3_IVA2_BOOTMOD_IDLE,
 715                          OMAP343X_CONTROL_IVA2_BOOTMOD);
 716
 717         /* Un-reset IVA2 */
 718         prm_write_mod_reg(0, OMAP3430_IVA2_MOD, OMAP2_RM_RSTCTRL);
 719
 720         /* Disable IVA2 clock */
 721         cm_write_mod_reg(0, OMAP3430_IVA2_MOD, CM_FCLKEN);
 722
 723         /* Reset IVA2 */
 724         prm_write_mod_reg(OMAP3430_RST1_IVA2_MASK |
 725                           OMAP3430_RST2_IVA2_MASK |
 726                           OMAP3430_RST3_IVA2_MASK,
 727                           OMAP3430_IVA2_MOD, OMAP2_RM_RSTCTRL);
 728 }
 729
 730 static void __init omap3_d2d_idle(void)
 731 {
 732         u16 mask, padconf;
 733
 734         /* In a stand alone OMAP3430 where there is not a stacked
 735          * modem for the D2D Idle Ack and D2D MStandby must be pulled
 736          * high. S CONTROL_PADCONF_SAD2D_IDLEACK and
 737          * CONTROL_PADCONF_SAD2D_MSTDBY to have a pull up. */
 738         mask = (1 << 4) | (1 << 3); /* pull-up, enabled */
 739         padconf = omap_ctrl_readw(OMAP3_PADCONF_SAD2D_MSTANDBY);
 740         padconf |= mask;
 741         omap_ctrl_writew(padconf, OMAP3_PADCONF_SAD2D_MSTANDBY);
 742
 743         padconf = omap_ctrl_readw(OMAP3_PADCONF_SAD2D_IDLEACK);
 744         padconf |= mask;
 745         omap_ctrl_writew(padconf, OMAP3_PADCONF_SAD2D_IDLEACK);
 746
 747         /* reset modem */
 748         prm_write_mod_reg(OMAP3430_RM_RSTCTRL_CORE_MODEM_SW_RSTPWRON_MASK |
 749                           OMAP3430_RM_RSTCTRL_CORE_MODEM_SW_RST_MASK,
 750                           CORE_MOD, OMAP2_RM_RSTCTRL);
 751         prm_write_mod_reg(0, CORE_MOD, OMAP2_RM_RSTCTRL);
 752 }
 753
 754 static void __init prcm_setup_regs(void)
 755 {
 756         /* XXX Reset all wkdeps. This should be done when initializing
 757          * powerdomains */
 758         prm_write_mod_reg(0, OMAP3430_IVA2_MOD, PM_WKDEP);
 759         prm_write_mod_reg(0, MPU_MOD, PM_WKDEP);
 760         prm_write_mod_reg(0, OMAP3430_DSS_MOD, PM_WKDEP);
 761         prm_write_mod_reg(0, OMAP3430_NEON_MOD, PM_WKDEP);
 762         prm_write_mod_reg(0, OMAP3430_CAM_MOD, PM_WKDEP);
 763         prm_write_mod_reg(0, OMAP3430_PER_MOD, PM_WKDEP);
 764         if (omap_rev() > OMAP3430_REV_ES1_0) {
 765                 prm_write_mod_reg(0, OMAP3430ES2_SGX_MOD, PM_WKDEP);
 766                 prm_write_mod_reg(0, OMAP3430ES2_USBHOST_MOD, PM_WKDEP);
 767         } else
 768                 prm_write_mod_reg(0, GFX_MOD, PM_WKDEP);
 769
 770         /*
 771          * Enable interface clock autoidle for all modules.
 772          * Note that in the long run this should be done by clockfw
 773          */
 774         cm_write_mod_reg(
 775                 OMAP3430_AUTO_MODEM_MASK |
 776                 OMAP3430ES2_AUTO_MMC3_MASK |
 777                 OMAP3430ES2_AUTO_ICR_MASK |
 778                 OMAP3430_AUTO_AES2_MASK |
 779                 OMAP3430_AUTO_SHA12_MASK |
 780                 OMAP3430_AUTO_DES2_MASK |
 781                 OMAP3430_AUTO_MMC2_MASK |
 782                 OMAP3430_AUTO_MMC1_MASK |
 783                 OMAP3430_AUTO_MSPRO_MASK |
 784                 OMAP3430_AUTO_HDQ_MASK |
 785                 OMAP3430_AUTO_MCSPI4_MASK |
 786                 OMAP3430_AUTO_MCSPI3_MASK |
 787                 OMAP3430_AUTO_MCSPI2_MASK |
 788                 OMAP3430_AUTO_MCSPI1_MASK |
 789                 OMAP3430_AUTO_I2C3_MASK |
 790                 OMAP3430_AUTO_I2C2_MASK |
 791                 OMAP3430_AUTO_I2C1_MASK |
 792                 OMAP3430_AUTO_UART2_MASK |
 793                 OMAP3430_AUTO_UART1_MASK |
 794                 OMAP3430_AUTO_GPT11_MASK |
 795                 OMAP3430_AUTO_GPT10_MASK |
 796                 OMAP3430_AUTO_MCBSP5_MASK |
 797                 OMAP3430_AUTO_MCBSP1_MASK |
 798                 OMAP3430ES1_AUTO_FAC_MASK | /* This is es1 only */
 799                 OMAP3430_AUTO_MAILBOXES_MASK |
 800                 OMAP3430_AUTO_OMAPCTRL_MASK |
 801                 OMAP3430ES1_AUTO_FSHOSTUSB_MASK |
 802                 OMAP3430_AUTO_HSOTGUSB_MASK |
 803                 OMAP3430_AUTO_SAD2D_MASK |
 804                 OMAP3430_AUTO_SSI_MASK,
 805                 CORE_MOD, CM_AUTOIDLE1);
 806
 807         cm_write_mod_reg(
 808                 OMAP3430_AUTO_PKA_MASK |
 809                 OMAP3430_AUTO_AES1_MASK |
 810                 OMAP3430_AUTO_RNG_MASK |
 811                 OMAP3430_AUTO_SHA11_MASK |
 812                 OMAP3430_AUTO_DES1_MASK,
 813                 CORE_MOD, CM_AUTOIDLE2);
 814
 815         if (omap_rev() > OMAP3430_REV_ES1_0) {
 816                 cm_write_mod_reg(
 817                         OMAP3430_AUTO_MAD2D_MASK |
 818                         OMAP3430ES2_AUTO_USBTLL_MASK,
 819                         CORE_MOD, CM_AUTOIDLE3);
 820         }
 821
 822         cm_write_mod_reg(
 823                 OMAP3430_AUTO_WDT2_MASK |
 824                 OMAP3430_AUTO_WDT1_MASK |
 825                 OMAP3430_AUTO_GPIO1_MASK |
 826                 OMAP3430_AUTO_32KSYNC_MASK |
 827                 OMAP3430_AUTO_GPT12_MASK |
 828                 OMAP3430_AUTO_GPT1_MASK,
 829                 WKUP_MOD, CM_AUTOIDLE);
 830
 831         cm_write_mod_reg(
 832                 OMAP3430_AUTO_DSS_MASK,
 833                 OMAP3430_DSS_MOD,
 834                 CM_AUTOIDLE);
 835
 836         cm_write_mod_reg(
 837                 OMAP3430_AUTO_CAM_MASK,
 838                 OMAP3430_CAM_MOD,
 839                 CM_AUTOIDLE);
 840
 841         cm_write_mod_reg(
 842                 OMAP3430_AUTO_GPIO6_MASK |
 843                 OMAP3430_AUTO_GPIO5_MASK |
 844                 OMAP3430_AUTO_GPIO4_MASK |
 845                 OMAP3430_AUTO_GPIO3_MASK |
 846                 OMAP3430_AUTO_GPIO2_MASK |
 847                 OMAP3430_AUTO_WDT3_MASK |
 848                 OMAP3430_AUTO_UART3_MASK |
 849                 OMAP3430_AUTO_GPT9_MASK |
 850                 OMAP3430_AUTO_GPT8_MASK |
 851                 OMAP3430_AUTO_GPT7_MASK |
 852                 OMAP3430_AUTO_GPT6_MASK |
 853                 OMAP3430_AUTO_GPT5_MASK |
 854                 OMAP3430_AUTO_GPT4_MASK |
 855                 OMAP3430_AUTO_GPT3_MASK |
 856                 OMAP3430_AUTO_GPT2_MASK |
 857                 OMAP3430_AUTO_MCBSP4_MASK |
 858                 OMAP3430_AUTO_MCBSP3_MASK |
 859                 OMAP3430_AUTO_MCBSP2_MASK,
 860                 OMAP3430_PER_MOD,
 861                 CM_AUTOIDLE);
 862
 863         if (omap_rev() > OMAP3430_REV_ES1_0) {
 864                 cm_write_mod_reg(
 865                         OMAP3430ES2_AUTO_USBHOST_MASK,
 866                         OMAP3430ES2_USBHOST_MOD,
 867                         CM_AUTOIDLE);
 868         }
 869
 870         omap_ctrl_writel(OMAP3430_AUTOIDLE_MASK, OMAP2_CONTROL_SYSCONFIG);
 871
 872         /*
 873          * Set all plls to autoidle. This is needed until autoidle is
 874          * enabled by clockfw
 875          */
 876         cm_write_mod_reg(1 << OMAP3430_AUTO_IVA2_DPLL_SHIFT,
 877                          OMAP3430_IVA2_MOD, CM_AUTOIDLE2);
 878         cm_write_mod_reg(1 << OMAP3430_AUTO_MPU_DPLL_SHIFT,
 879                          MPU_MOD,
 880                          CM_AUTOIDLE2);
 881         cm_write_mod_reg((1 << OMAP3430_AUTO_PERIPH_DPLL_SHIFT) |
 882                          (1 << OMAP3430_AUTO_CORE_DPLL_SHIFT),
 883                          PLL_MOD,
 884                          CM_AUTOIDLE);
 885         cm_write_mod_reg(1 << OMAP3430ES2_AUTO_PERIPH2_DPLL_SHIFT,
 886                          PLL_MOD,
 887                          CM_AUTOIDLE2);
 888
 889         /*
 890          * Enable control of expternal oscillator through
 891          * sys_clkreq. In the long run clock framework should
 892          * take care of this.
 893          */
 894         prm_rmw_mod_reg_bits(OMAP_AUTOEXTCLKMODE_MASK,
 895                              1 << OMAP_AUTOEXTCLKMODE_SHIFT,
 896                              OMAP3430_GR_MOD,
 897                              OMAP3_PRM_CLKSRC_CTRL_OFFSET);
 898
 899         /* setup wakup source */
 900         prm_write_mod_reg(OMAP3430_EN_IO_MASK | OMAP3430_EN_GPIO1_MASK |
 901                           OMAP3430_EN_GPT1_MASK | OMAP3430_EN_GPT12_MASK,
 902                           WKUP_MOD, PM_WKEN);
 903         /* No need to write EN_IO, that is always enabled */
 904         prm_write_mod_reg(OMAP3430_GRPSEL_GPIO1_MASK |
 905                           OMAP3430_GRPSEL_GPT1_MASK |
 906                           OMAP3430_GRPSEL_GPT12_MASK,
 907                           WKUP_MOD, OMAP3430_PM_MPUGRPSEL);
 908         /* For some reason IO doesn't generate wakeup event even if
 909          * it is selected to mpu wakeup goup */
 910         prm_write_mod_reg(OMAP3430_IO_EN_MASK | OMAP3430_WKUP_EN_MASK,
 911                           OCP_MOD, OMAP3_PRM_IRQENABLE_MPU_OFFSET);
 912
 913         /* Enable PM_WKEN to support DSS LPR */
 914         prm_write_mod_reg(OMAP3430_PM_WKEN_DSS_EN_DSS_MASK,
 915                                 OMAP3430_DSS_MOD, PM_WKEN);
 916
 917         /* Enable wakeups in PER */
 918         prm_write_mod_reg(OMAP3430_EN_GPIO2_MASK | OMAP3430_EN_GPIO3_MASK |
 919                           OMAP3430_EN_GPIO4_MASK | OMAP3430_EN_GPIO5_MASK |
 920                           OMAP3430_EN_GPIO6_MASK | OMAP3430_EN_UART3_MASK |
 921                           OMAP3430_EN_MCBSP2_MASK | OMAP3430_EN_MCBSP3_MASK |
 922                           OMAP3430_EN_MCBSP4_MASK,
 923                           OMAP3430_PER_MOD, PM_WKEN);
 924         /* and allow them to wake up MPU */
 925         prm_write_mod_reg(OMAP3430_GRPSEL_GPIO2_MASK |
 926                           OMAP3430_GRPSEL_GPIO3_MASK |
 927                           OMAP3430_GRPSEL_GPIO4_MASK |
 928                           OMAP3430_GRPSEL_GPIO5_MASK |
 929                           OMAP3430_GRPSEL_GPIO6_MASK |
 930                           OMAP3430_GRPSEL_UART3_MASK |
 931                           OMAP3430_GRPSEL_MCBSP2_MASK |
 932                           OMAP3430_GRPSEL_MCBSP3_MASK |
 933                           OMAP3430_GRPSEL_MCBSP4_MASK,
 934                           OMAP3430_PER_MOD, OMAP3430_PM_MPUGRPSEL);
 935
 936         /* Don't attach IVA interrupts */
 937         prm_write_mod_reg(0, WKUP_MOD, OMAP3430_PM_IVAGRPSEL);
 938         prm_write_mod_reg(0, CORE_MOD, OMAP3430_PM_IVAGRPSEL1);
 939         prm_write_mod_reg(0, CORE_MOD, OMAP3430ES2_PM_IVAGRPSEL3);
 940         prm_write_mod_reg(0, OMAP3430_PER_MOD, OMAP3430_PM_IVAGRPSEL);
 941
 942         /* Clear any pending 'reset' flags */
 943         prm_write_mod_reg(0xffffffff, MPU_MOD, OMAP2_RM_RSTST);
 944         prm_write_mod_reg(0xffffffff, CORE_MOD, OMAP2_RM_RSTST);
 945         prm_write_mod_reg(0xffffffff, OMAP3430_PER_MOD, OMAP2_RM_RSTST);
 946         prm_write_mod_reg(0xffffffff, OMAP3430_EMU_MOD, OMAP2_RM_RSTST);
 947         prm_write_mod_reg(0xffffffff, OMAP3430_NEON_MOD, OMAP2_RM_RSTST);
 948         prm_write_mod_reg(0xffffffff, OMAP3430_DSS_MOD, OMAP2_RM_RSTST);
 949         prm_write_mod_reg(0xffffffff, OMAP3430ES2_USBHOST_MOD, OMAP2_RM_RSTST);
 950
 951         /* Clear any pending PRCM interrupts */
 952         prm_write_mod_reg(0, OCP_MOD, OMAP3_PRM_IRQSTATUS_MPU_OFFSET);
 953
 954         omap3_iva_idle();
 955         omap3_d2d_idle();
 956 }
 957
 958 void omap3_pm_off_mode_enable(int enable)
 959 {
 960         struct power_state *pwrst;
 961         u32 state;
 962
 963         if (enable)
 964                 state = PWRDM_POWER_OFF;
 965         else
 966                 state = PWRDM_POWER_RET;
 967
 968 #ifdef CONFIG_CPU_IDLE
 969         omap3_cpuidle_update_states();
 970 #endif
 971
 972         list_for_each_entry(pwrst, &pwrst_list, node) {
 973                 pwrst->next_state = state;
 974                 set_pwrdm_state(pwrst->pwrdm, state);
 975         }
 976 }
 977
 978 int omap3_pm_get_suspend_state(struct powerdomain *pwrdm)
 979 {
 980         struct power_state *pwrst;
 981
 982         list_for_each_entry(pwrst, &pwrst_list, node) {
 983                 if (pwrst->pwrdm == pwrdm)
 984                         return pwrst->next_state;
 985         }
 986         return -EINVAL;
 987 }
 988
 989 int omap3_pm_set_suspend_state(struct powerdomain *pwrdm, int state)
 990 {
 991         struct power_state *pwrst;
 992
 993         list_for_each_entry(pwrst, &pwrst_list, node) {
 994                 if (pwrst->pwrdm == pwrdm) {
 995                         pwrst->next_state = state;
 996                         return 0;
 997                 }
 998         }
 999         return -EINVAL;
1000 }
1001
1002 static int __init pwrdms_setup(struct powerdomain *pwrdm, void *unused)
1003 {
1004         struct power_state *pwrst;
1005
1006         if (!pwrdm->pwrsts)
1007                 return 0;
1008
1009         pwrst = kmalloc(sizeof(struct power_state), GFP_ATOMIC);
1010         if (!pwrst)
1011                 return -ENOMEM;
1012         pwrst->pwrdm = pwrdm;
1013         pwrst->next_state = PWRDM_POWER_RET;
1014         list_add(&pwrst->node, &pwrst_list);
1015
1016         if (pwrdm_has_hdwr_sar(pwrdm))
1017                 pwrdm_enable_hdwr_sar(pwrdm);
1018
1019         return set_pwrdm_state(pwrst->pwrdm, pwrst->next_state);
1020 }
1021
1022 /*
1023  * Enable hw supervised mode for all clockdomains if it's
1024  * supported. Initiate sleep transition for other clockdomains, if
1025  * they are not used
1026  */
1027 static int __init clkdms_setup(struct clockdomain *clkdm, void *unused)
1028 {
1029         clkdm_clear_all_wkdeps(clkdm);
1030         clkdm_clear_all_sleepdeps(clkdm);
1031
1032         if (clkdm->flags & CLKDM_CAN_ENABLE_AUTO)
1033                 omap2_clkdm_allow_idle(clkdm);
1034         else if (clkdm->flags & CLKDM_CAN_FORCE_SLEEP &&
1035                  atomic_read(&clkdm->usecount) == 0)
1036                 omap2_clkdm_sleep(clkdm);
1037         return 0;
1038 }
1039
1040 void omap_push_sram_idle(void)
1041 {
1042         _omap_sram_idle = omap_sram_push(omap34xx_cpu_suspend,
1043                                         omap34xx_cpu_suspend_sz);
1044         if (omap_type() != OMAP2_DEVICE_TYPE_GP)
1045                 _omap_save_secure_sram = omap_sram_push(save_secure_ram_context,
1046                                 save_secure_ram_context_sz);
1047 }
1048
1049 static int __init omap3_pm_init(void)
1050 {
1051         struct power_state *pwrst, *tmp;
1052         struct clockdomain *neon_clkdm, *per_clkdm, *mpu_clkdm, *core_clkdm;
1053         int ret;
1054
1055         if (!cpu_is_omap34xx())
1056                 return -ENODEV;
1057
1058         printk(KERN_ERR "Power Management for TI OMAP3.\n");
1059
1060         /* XXX prcm_setup_regs needs to be before enabling hw
1061          * supervised mode for powerdomains */
1062         prcm_setup_regs();
1063
1064         ret = request_irq(INT_34XX_PRCM_MPU_IRQ,
1065                           (irq_handler_t)prcm_interrupt_handler,
1066                           IRQF_DISABLED, "prcm", NULL);
1067         if (ret) {
1068                 printk(KERN_ERR "request_irq failed to register for 0x%x\n",
1069                        INT_34XX_PRCM_MPU_IRQ);
1070                 goto err1;
1071         }
1072
1073         ret = pwrdm_for_each(pwrdms_setup, NULL);
1074         if (ret) {
1075                 printk(KERN_ERR "Failed to setup powerdomains\n");
1076                 goto err2;
1077         }
1078
1079         (void) clkdm_for_each(clkdms_setup, NULL);
1080
1081         mpu_pwrdm = pwrdm_lookup("mpu_pwrdm");
1082         if (mpu_pwrdm == NULL) {
1083                 printk(KERN_ERR "Failed to get mpu_pwrdm\n");
1084                 goto err2;
1085         }
1086
1087         neon_pwrdm = pwrdm_lookup("neon_pwrdm");
1088         per_pwrdm = pwrdm_lookup("per_pwrdm");
1089         core_pwrdm = pwrdm_lookup("core_pwrdm");
1090         cam_pwrdm = pwrdm_lookup("cam_pwrdm");
1091
1092         neon_clkdm = clkdm_lookup("neon_clkdm");
1093         mpu_clkdm = clkdm_lookup("mpu_clkdm");
1094         per_clkdm = clkdm_lookup("per_clkdm");
1095         core_clkdm = clkdm_lookup("core_clkdm");
1096
1097         omap_push_sram_idle();
1098 #ifdef CONFIG_SUSPEND
1099         suspend_set_ops(&omap_pm_ops);
1100 #endif /* CONFIG_SUSPEND */
1101
1102         pm_idle = omap3_pm_idle;
1103         omap3_idle_init();
1104
1105         clkdm_add_wkdep(neon_clkdm, mpu_clkdm);
1106         if (omap_type() != OMAP2_DEVICE_TYPE_GP) {
1107                 omap3_secure_ram_storage =
1108                         kmalloc(0x803F, GFP_KERNEL);
1109                 if (!omap3_secure_ram_storage)
1110                         printk(KERN_ERR "Memory allocation failed when"
1111                                         "allocating for secure sram context\n");
1112
1113                 local_irq_disable();
1114                 local_fiq_disable();
1115
1116                 omap_dma_global_context_save();
1117                 omap3_save_secure_ram_context(PWRDM_POWER_ON);
1118                 omap_dma_global_context_restore();
1119
1120                 local_irq_enable();
1121                 local_fiq_enable();
1122         }
1123
1124         omap3_save_scratchpad_contents();
1125 err1:
1126         return ret;
1127 err2:
1128         free_irq(INT_34XX_PRCM_MPU_IRQ, NULL);
1129         list_for_each_entry_safe(pwrst, tmp, &pwrst_list, node) {
1130                 list_del(&pwrst->node);
1131                 kfree(pwrst);
1132         }
1133         return ret;
1134 }
1135
1136 late_initcall(omap3_pm_init);