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
  31 #include <plat/sram.h>
  32 #include <plat/clockdomain.h>
  33 #include <plat/powerdomain.h>
  34 #include <plat/control.h>
  35 #include <plat/serial.h>
  36 #include <plat/sdrc.h>
  37 #include <plat/prcm.h>
  38 #include <plat/gpmc.h>
  39 #include <plat/dma.h>
  40 #include <plat/dmtimer.h>
  41
  42 #include <asm/tlbflush.h>
  43
  44 #include "cm.h"
  45 #include "cm-regbits-34xx.h"
  46 #include "prm-regbits-34xx.h"
  47
  48 #include "prm.h"
  49 #include "pm.h"
  50 #include "sdrc.h"
  51
  52 /* Scratchpad offsets */
  53 #define OMAP343X_TABLE_ADDRESS_OFFSET      0x31
  54 #define OMAP343X_TABLE_VALUE_OFFSET        0x30
  55 #define OMAP343X_CONTROL_REG_VALUE_OFFSET  0x32
  56
  57 u32 enable_off_mode;
  58 u32 sleep_while_idle;
  59 u32 wakeup_timer_seconds;
  60
  61 struct power_state {
  62         struct powerdomain *pwrdm;
  63         u32 next_state;
  64 #ifdef CONFIG_SUSPEND
  65         u32 saved_state;
  66 #endif
  67         struct list_head node;
  68 };
  69
  70 static LIST_HEAD(pwrst_list);
  71
  72 static void (*_omap_sram_idle)(u32 *addr, int save_state);
  73
  74 static int (*_omap_save_secure_sram)(u32 *addr);
  75
  76 static struct powerdomain *mpu_pwrdm, *neon_pwrdm;
  77 static struct powerdomain *core_pwrdm, *per_pwrdm;
  78 static struct powerdomain *cam_pwrdm;
  79
  80 static inline void omap3_per_save_context(void)
  81 {
  82         omap_gpio_save_context();
  83 }
  84
  85 static inline void omap3_per_restore_context(void)
  86 {
  87         omap_gpio_restore_context();
  88 }
  89
  90 static void omap3_enable_io_chain(void)
  91 {
  92         int timeout = 0;
  93
  94         if (omap_rev() >= OMAP3430_REV_ES3_1) {
  95                 prm_set_mod_reg_bits(OMAP3430_EN_IO_CHAIN, WKUP_MOD, PM_WKEN);
  96                 /* Do a readback to assure write has been done */
  97                 prm_read_mod_reg(WKUP_MOD, PM_WKEN);
  98
  99                 while (!(prm_read_mod_reg(WKUP_MOD, PM_WKST) &
 100                          OMAP3430_ST_IO_CHAIN)) {
 101                         timeout++;
 102                         if (timeout > 1000) {
 103                                 printk(KERN_ERR "Wake up daisy chain "
 104                                        "activation failed.\n");
 105                                 return;
 106                         }
 107                         prm_set_mod_reg_bits(OMAP3430_ST_IO_CHAIN,
 108                                              WKUP_MOD, PM_WKST);
 109                 }
 110         }
 111 }
 112
 113 static void omap3_disable_io_chain(void)
 114 {
 115         if (omap_rev() >= OMAP3430_REV_ES3_1)
 116                 prm_clear_mod_reg_bits(OMAP3430_EN_IO_CHAIN, WKUP_MOD, PM_WKEN);
 117 }
 118
 119 static void omap3_core_save_context(void)
 120 {
 121         u32 control_padconf_off;
 122
 123         /* Save the padconf registers */
 124         control_padconf_off = omap_ctrl_readl(OMAP343X_CONTROL_PADCONF_OFF);
 125         control_padconf_off |= START_PADCONF_SAVE;
 126         omap_ctrl_writel(control_padconf_off, OMAP343X_CONTROL_PADCONF_OFF);
 127         /* wait for the save to complete */
 128         while (!(omap_ctrl_readl(OMAP343X_CONTROL_GENERAL_PURPOSE_STATUS)
 129                         & PADCONF_SAVE_DONE))
 130                 udelay(1);
 131
 132         /*
 133          * Force write last pad into memory, as this can fail in some
 134          * cases according to erratas 1.157, 1.185
 135          */
 136         omap_ctrl_writel(omap_ctrl_readl(OMAP343X_PADCONF_ETK_D14),
 137                 OMAP343X_CONTROL_MEM_WKUP + 0x2a0);
 138
 139         /* Save the Interrupt controller context */
 140         omap_intc_save_context();
 141         /* Save the GPMC context */
 142         omap3_gpmc_save_context();
 143         /* Save the system control module context, padconf already save above*/
 144         omap3_control_save_context();
 145         omap_dma_global_context_save();
 146 }
 147
 148 static void omap3_core_restore_context(void)
 149 {
 150         /* Restore the control module context, padconf restored by h/w */
 151         omap3_control_restore_context();
 152         /* Restore the GPMC context */
 153         omap3_gpmc_restore_context();
 154         /* Restore the interrupt controller context */
 155         omap_intc_restore_context();
 156         omap_dma_global_context_restore();
 157 }
 158
 159 /*
 160  * FIXME: This function should be called before entering off-mode after
 161  * OMAP3 secure services have been accessed. Currently it is only called
 162  * once during boot sequence, but this works as we are not using secure
 163  * services.
 164  */
 165 static void omap3_save_secure_ram_context(u32 target_mpu_state)
 166 {
 167         u32 ret;
 168
 169         if (omap_type() != OMAP2_DEVICE_TYPE_GP) {
 170                 /*
 171                  * MPU next state must be set to POWER_ON temporarily,
 172                  * otherwise the WFI executed inside the ROM code
 173                  * will hang the system.
 174                  */
 175                 pwrdm_set_next_pwrst(mpu_pwrdm, PWRDM_POWER_ON);
 176                 ret = _omap_save_secure_sram((u32 *)
 177                                 __pa(omap3_secure_ram_storage));
 178                 pwrdm_set_next_pwrst(mpu_pwrdm, target_mpu_state);
 179                 /* Following is for error tracking, it should not happen */
 180                 if (ret) {
 181                         printk(KERN_ERR "save_secure_sram() returns %08x\n",
 182                                 ret);
 183                         while (1)
 184                                 ;
 185                 }
 186         }
 187 }
 188
 189 /*
 190  * PRCM Interrupt Handler Helper Function
 191  *
 192  * The purpose of this function is to clear any wake-up events latched
 193  * in the PRCM PM_WKST_x registers. It is possible that a wake-up event
 194  * may occur whilst attempting to clear a PM_WKST_x register and thus
 195  * set another bit in this register. A while loop is used to ensure
 196  * that any peripheral wake-up events occurring while attempting to
 197  * clear the PM_WKST_x are detected and cleared.
 198  */
 199 static int prcm_clear_mod_irqs(s16 module, u8 regs)
 200 {
 201         u32 wkst, fclk, iclk, clken;
 202         u16 wkst_off = (regs == 3) ? OMAP3430ES2_PM_WKST3 : PM_WKST1;
 203         u16 fclk_off = (regs == 3) ? OMAP3430ES2_CM_FCLKEN3 : CM_FCLKEN1;
 204         u16 iclk_off = (regs == 3) ? CM_ICLKEN3 : CM_ICLKEN1;
 205         u16 grpsel_off = (regs == 3) ?
 206                 OMAP3430ES2_PM_MPUGRPSEL3 : OMAP3430_PM_MPUGRPSEL;
 207         int c = 0;
 208
 209         wkst = prm_read_mod_reg(module, wkst_off);
 210         wkst &= prm_read_mod_reg(module, grpsel_off);
 211         if (wkst) {
 212                 iclk = cm_read_mod_reg(module, iclk_off);
 213                 fclk = cm_read_mod_reg(module, fclk_off);
 214                 while (wkst) {
 215                         clken = wkst;
 216                         cm_set_mod_reg_bits(clken, module, iclk_off);
 217                         /*
 218                          * For USBHOST, we don't know whether HOST1 or
 219                          * HOST2 woke us up, so enable both f-clocks
 220                          */
 221                         if (module == OMAP3430ES2_USBHOST_MOD)
 222                                 clken |= 1 << OMAP3430ES2_EN_USBHOST2_SHIFT;
 223                         cm_set_mod_reg_bits(clken, module, fclk_off);
 224                         prm_write_mod_reg(wkst, module, wkst_off);
 225                         wkst = prm_read_mod_reg(module, wkst_off);
 226                         c++;
 227                 }
 228                 cm_write_mod_reg(iclk, module, iclk_off);
 229                 cm_write_mod_reg(fclk, module, fclk_off);
 230         }
 231
 232         return c;
 233 }
 234
 235 static int _prcm_int_handle_wakeup(void)
 236 {
 237         int c;
 238
 239         c = prcm_clear_mod_irqs(WKUP_MOD, 1);
 240         c += prcm_clear_mod_irqs(CORE_MOD, 1);
 241         c += prcm_clear_mod_irqs(OMAP3430_PER_MOD, 1);
 242         if (omap_rev() > OMAP3430_REV_ES1_0) {
 243                 c += prcm_clear_mod_irqs(CORE_MOD, 3);
 244                 c += prcm_clear_mod_irqs(OMAP3430ES2_USBHOST_MOD, 1);
 245         }
 246
 247         return c;
 248 }
 249
 250 /*
 251  * PRCM Interrupt Handler
 252  *
 253  * The PRM_IRQSTATUS_MPU register indicates if there are any pending
 254  * interrupts from the PRCM for the MPU. These bits must be cleared in
 255  * order to clear the PRCM interrupt. The PRCM interrupt handler is
 256  * implemented to simply clear the PRM_IRQSTATUS_MPU in order to clear
 257  * the PRCM interrupt. Please note that bit 0 of the PRM_IRQSTATUS_MPU
 258  * register indicates that a wake-up event is pending for the MPU and
 259  * this bit can only be cleared if the all the wake-up events latched
 260  * in the various PM_WKST_x registers have been cleared. The interrupt
 261  * handler is implemented using a do-while loop so that if a wake-up
 262  * event occurred during the processing of the prcm interrupt handler
 263  * (setting a bit in the corresponding PM_WKST_x register and thus
 264  * preventing us from clearing bit 0 of the PRM_IRQSTATUS_MPU register)
 265  * this would be handled.
 266  */
 267 static irqreturn_t prcm_interrupt_handler (int irq, void *dev_id)
 268 {
 269         u32 irqstatus_mpu;
 270         int c = 0;
 271
 272         do {
 273                 irqstatus_mpu = prm_read_mod_reg(OCP_MOD,
 274                                         OMAP3_PRM_IRQSTATUS_MPU_OFFSET);
 275
 276                 if (irqstatus_mpu & (OMAP3430_WKUP_ST | OMAP3430_IO_ST)) {
 277                         c = _prcm_int_handle_wakeup();
 278
 279                         /*
 280                          * Is the MPU PRCM interrupt handler racing with the
 281                          * IVA2 PRCM interrupt handler ?
 282                          */
 283                         WARN(c == 0, "prcm: WARNING: PRCM indicated MPU wakeup "
 284                              "but no wakeup sources are marked\n");
 285                 } else {
 286                         /* XXX we need to expand our PRCM interrupt handler */
 287                         WARN(1, "prcm: WARNING: PRCM interrupt received, but "
 288                              "no code to handle it (%08x)\n", irqstatus_mpu);
 289                 }
 290
 291                 prm_write_mod_reg(irqstatus_mpu, OCP_MOD,
 292                                         OMAP3_PRM_IRQSTATUS_MPU_OFFSET);
 293
 294         } while (prm_read_mod_reg(OCP_MOD, OMAP3_PRM_IRQSTATUS_MPU_OFFSET));
 295
 296         return IRQ_HANDLED;
 297 }
 298
 299 static void restore_control_register(u32 val)
 300 {
 301         __asm__ __volatile__ ("mcr p15, 0, %0, c1, c0, 0" : : "r" (val));
 302 }
 303
 304 /* Function to restore the table entry that was modified for enabling MMU */
 305 static void restore_table_entry(void)
 306 {
 307         u32 *scratchpad_address;
 308         u32 previous_value, control_reg_value;
 309         u32 *address;
 310
 311         scratchpad_address = OMAP2_L4_IO_ADDRESS(OMAP343X_SCRATCHPAD);
 312
 313         /* Get address of entry that was modified */
 314         address = (u32 *)__raw_readl(scratchpad_address +
 315                                      OMAP343X_TABLE_ADDRESS_OFFSET);
 316         /* Get the previous value which needs to be restored */
 317         previous_value = __raw_readl(scratchpad_address +
 318                                      OMAP343X_TABLE_VALUE_OFFSET);
 319         address = __va(address);
 320         *address = previous_value;
 321         flush_tlb_all();
 322         control_reg_value = __raw_readl(scratchpad_address
 323                                         + OMAP343X_CONTROL_REG_VALUE_OFFSET);
 324         /* This will enable caches and prediction */
 325         restore_control_register(control_reg_value);
 326 }
 327
 328 void omap_sram_idle(void)
 329 {
 330         /* Variable to tell what needs to be saved and restored
 331          * in omap_sram_idle*/
 332         /* save_state = 0 => Nothing to save and restored */
 333         /* save_state = 1 => Only L1 and logic lost */
 334         /* save_state = 2 => Only L2 lost */
 335         /* save_state = 3 => L1, L2 and logic lost */
 336         int save_state = 0;
 337         int mpu_next_state = PWRDM_POWER_ON;
 338         int per_next_state = PWRDM_POWER_ON;
 339         int core_next_state = PWRDM_POWER_ON;
 340         int core_prev_state, per_prev_state;
 341         u32 sdrc_pwr = 0;
 342         int per_state_modified = 0;
 343
 344         if (!_omap_sram_idle)
 345                 return;
 346
 347         pwrdm_clear_all_prev_pwrst(mpu_pwrdm);
 348         pwrdm_clear_all_prev_pwrst(neon_pwrdm);
 349         pwrdm_clear_all_prev_pwrst(core_pwrdm);
 350         pwrdm_clear_all_prev_pwrst(per_pwrdm);
 351
 352         mpu_next_state = pwrdm_read_next_pwrst(mpu_pwrdm);
 353         switch (mpu_next_state) {
 354         case PWRDM_POWER_ON:
 355         case PWRDM_POWER_RET:
 356                 /* No need to save context */
 357                 save_state = 0;
 358                 break;
 359         case PWRDM_POWER_OFF:
 360                 save_state = 3;
 361                 break;
 362         default:
 363                 /* Invalid state */
 364                 printk(KERN_ERR "Invalid mpu state in sram_idle\n");
 365                 return;
 366         }
 367         pwrdm_pre_transition();
 368
 369         /* NEON control */
 370         if (pwrdm_read_pwrst(neon_pwrdm) == PWRDM_POWER_ON)
 371                 pwrdm_set_next_pwrst(neon_pwrdm, mpu_next_state);
 372
 373         /* PER */
 374         per_next_state = pwrdm_read_next_pwrst(per_pwrdm);
 375         core_next_state = pwrdm_read_next_pwrst(core_pwrdm);
 376         if (per_next_state < PWRDM_POWER_ON) {
 377                 omap_uart_prepare_idle(2);
 378                 omap2_gpio_prepare_for_retention();
 379                 if (per_next_state == PWRDM_POWER_OFF) {
 380                         if (core_next_state == PWRDM_POWER_ON) {
 381                                 per_next_state = PWRDM_POWER_RET;
 382                                 pwrdm_set_next_pwrst(per_pwrdm, per_next_state);
 383                                 per_state_modified = 1;
 384                         } else
 385                                 omap3_per_save_context();
 386                 }
 387         }
 388
 389         if (pwrdm_read_pwrst(cam_pwrdm) == PWRDM_POWER_ON)
 390                 omap2_clkdm_deny_idle(mpu_pwrdm->pwrdm_clkdms[0]);
 391
 392         /* CORE */
 393         if (core_next_state < PWRDM_POWER_ON) {
 394                 omap_uart_prepare_idle(0);
 395                 omap_uart_prepare_idle(1);
 396                 if (core_next_state == PWRDM_POWER_OFF) {
 397                         omap3_core_save_context();
 398                         omap3_prcm_save_context();
 399                 }
 400                 /* Enable IO-PAD and IO-CHAIN wakeups */
 401                 prm_set_mod_reg_bits(OMAP3430_EN_IO, WKUP_MOD, PM_WKEN);
 402                 omap3_enable_io_chain();
 403         }
 404         omap3_intc_prepare_idle();
 405
 406         /*
 407         * On EMU/HS devices ROM code restores a SRDC value
 408         * from scratchpad which has automatic self refresh on timeout
 409         * of AUTO_CNT = 1 enabled. This takes care of errata 1.142.
 410         * Hence store/restore the SDRC_POWER register here.
 411         */
 412         if (omap_rev() >= OMAP3430_REV_ES3_0 &&
 413             omap_type() != OMAP2_DEVICE_TYPE_GP &&
 414             core_next_state == PWRDM_POWER_OFF)
 415                 sdrc_pwr = sdrc_read_reg(SDRC_POWER);
 416
 417         /*
 418          * omap3_arm_context is the location where ARM registers
 419          * get saved. The restore path then reads from this
 420          * location and restores them back.
 421          */
 422         _omap_sram_idle(omap3_arm_context, save_state);
 423         cpu_init();
 424
 425         /* Restore normal SDRC POWER settings */
 426         if (omap_rev() >= OMAP3430_REV_ES3_0 &&
 427             omap_type() != OMAP2_DEVICE_TYPE_GP &&
 428             core_next_state == PWRDM_POWER_OFF)
 429                 sdrc_write_reg(sdrc_pwr, SDRC_POWER);
 430
 431         /* Restore table entry modified during MMU restoration */
 432         if (pwrdm_read_prev_pwrst(mpu_pwrdm) == PWRDM_POWER_OFF)
 433                 restore_table_entry();
 434
 435         /* CORE */
 436         if (core_next_state < PWRDM_POWER_ON) {
 437                 core_prev_state = pwrdm_read_prev_pwrst(core_pwrdm);
 438                 if (core_prev_state == PWRDM_POWER_OFF) {
 439                         omap3_core_restore_context();
 440                         omap3_prcm_restore_context();
 441                         omap3_sram_restore_context();
 442                         omap2_sms_restore_context();
 443                 }
 444                 omap_uart_resume_idle(0);
 445                 omap_uart_resume_idle(1);
 446                 if (core_next_state == PWRDM_POWER_OFF)
 447                         prm_clear_mod_reg_bits(OMAP3430_AUTO_OFF,
 448                                                OMAP3430_GR_MOD,
 449                                                OMAP3_PRM_VOLTCTRL_OFFSET);
 450         }
 451         omap3_intc_resume_idle();
 452
 453         /* PER */
 454         if (per_next_state < PWRDM_POWER_ON) {
 455                 per_prev_state = pwrdm_read_prev_pwrst(per_pwrdm);
 456                 if (per_prev_state == PWRDM_POWER_OFF)
 457                         omap3_per_restore_context();
 458                 omap2_gpio_resume_after_retention();
 459                 omap_uart_resume_idle(2);
 460                 if (per_state_modified)
 461                         pwrdm_set_next_pwrst(per_pwrdm, PWRDM_POWER_OFF);
 462         }
 463
 464         /* Disable IO-PAD and IO-CHAIN wakeup */
 465         if (core_next_state < PWRDM_POWER_ON) {
 466                 prm_clear_mod_reg_bits(OMAP3430_EN_IO, WKUP_MOD, PM_WKEN);
 467                 omap3_disable_io_chain();
 468         }
 469
 470         pwrdm_post_transition();
 471
 472         omap2_clkdm_allow_idle(mpu_pwrdm->pwrdm_clkdms[0]);
 473 }
 474
 475 int omap3_can_sleep(void)
 476 {
 477         if (!sleep_while_idle)
 478                 return 0;
 479         if (!omap_uart_can_sleep())
 480                 return 0;
 481         return 1;
 482 }
 483
 484 /* This sets pwrdm state (other than mpu & core. Currently only ON &
 485  * RET are supported. Function is assuming that clkdm doesn't have
 486  * hw_sup mode enabled. */
 487 int set_pwrdm_state(struct powerdomain *pwrdm, u32 state)
 488 {
 489         u32 cur_state;
 490         int sleep_switch = 0;
 491         int ret = 0;
 492
 493         if (pwrdm == NULL || IS_ERR(pwrdm))
 494                 return -EINVAL;
 495
 496         while (!(pwrdm->pwrsts & (1 << state))) {
 497                 if (state == PWRDM_POWER_OFF)
 498                         return ret;
 499                 state--;
 500         }
 501
 502         cur_state = pwrdm_read_next_pwrst(pwrdm);
 503         if (cur_state == state)
 504                 return ret;
 505
 506         if (pwrdm_read_pwrst(pwrdm) < PWRDM_POWER_ON) {
 507                 omap2_clkdm_wakeup(pwrdm->pwrdm_clkdms[0]);
 508                 sleep_switch = 1;
 509                 pwrdm_wait_transition(pwrdm);
 510         }
 511
 512         ret = pwrdm_set_next_pwrst(pwrdm, state);
 513         if (ret) {
 514                 printk(KERN_ERR "Unable to set state of powerdomain: %s\n",
 515                        pwrdm->name);
 516                 goto err;
 517         }
 518
 519         if (sleep_switch) {
 520                 omap2_clkdm_allow_idle(pwrdm->pwrdm_clkdms[0]);
 521                 pwrdm_wait_transition(pwrdm);
 522                 pwrdm_state_switch(pwrdm);
 523         }
 524
 525 err:
 526         return ret;
 527 }
 528
 529 static void omap3_pm_idle(void)
 530 {
 531         local_irq_disable();
 532         local_fiq_disable();
 533
 534         if (!omap3_can_sleep())
 535                 goto out;
 536
 537         if (omap_irq_pending() || need_resched())
 538                 goto out;
 539
 540         omap_sram_idle();
 541
 542 out:
 543         local_fiq_enable();
 544         local_irq_enable();
 545 }
 546
 547 #ifdef CONFIG_SUSPEND
 548 static suspend_state_t suspend_state;
 549
 550 static void omap2_pm_wakeup_on_timer(u32 seconds)
 551 {
 552         u32 tick_rate, cycles;
 553
 554         if (!seconds)
 555                 return;
 556
 557         tick_rate = clk_get_rate(omap_dm_timer_get_fclk(gptimer_wakeup));
 558         cycles = tick_rate * seconds;
 559         omap_dm_timer_stop(gptimer_wakeup);
 560         omap_dm_timer_set_load_start(gptimer_wakeup, 0, 0xffffffff - cycles);
 561
 562         pr_info("PM: Resume timer in %d secs (%d ticks at %d ticks/sec.)\n",
 563                 seconds, cycles, tick_rate);
 564 }
 565
 566 static int omap3_pm_prepare(void)
 567 {
 568         disable_hlt();
 569         return 0;
 570 }
 571
 572 static int omap3_pm_suspend(void)
 573 {
 574         struct power_state *pwrst;
 575         int state, ret = 0;
 576
 577         if (wakeup_timer_seconds)
 578                 omap2_pm_wakeup_on_timer(wakeup_timer_seconds);
 579
 580         /* Read current next_pwrsts */
 581         list_for_each_entry(pwrst, &pwrst_list, node)
 582                 pwrst->saved_state = pwrdm_read_next_pwrst(pwrst->pwrdm);
 583         /* Set ones wanted by suspend */
 584         list_for_each_entry(pwrst, &pwrst_list, node) {
 585                 if (set_pwrdm_state(pwrst->pwrdm, pwrst->next_state))
 586                         goto restore;
 587                 if (pwrdm_clear_all_prev_pwrst(pwrst->pwrdm))
 588                         goto restore;
 589         }
 590
 591         omap_uart_prepare_suspend();
 592         omap3_intc_suspend();
 593
 594         omap_sram_idle();
 595
 596 restore:
 597         /* Restore next_pwrsts */
 598         list_for_each_entry(pwrst, &pwrst_list, node) {
 599                 state = pwrdm_read_prev_pwrst(pwrst->pwrdm);
 600                 if (state > pwrst->next_state) {
 601                         printk(KERN_INFO "Powerdomain (%s) didn't enter "
 602                                "target state %d\n",
 603                                pwrst->pwrdm->name, pwrst->next_state);
 604                         ret = -1;
 605                 }
 606                 set_pwrdm_state(pwrst->pwrdm, pwrst->saved_state);
 607         }
 608         if (ret)
 609                 printk(KERN_ERR "Could not enter target state in pm_suspend\n");
 610         else
 611                 printk(KERN_INFO "Successfully put all powerdomains "
 612                        "to target state\n");
 613
 614         return ret;
 615 }
 616
 617 static int omap3_pm_enter(suspend_state_t unused)
 618 {
 619         int ret = 0;
 620
 621         switch (suspend_state) {
 622         case PM_SUSPEND_STANDBY:
 623         case PM_SUSPEND_MEM:
 624                 ret = omap3_pm_suspend();
 625                 break;
 626         default:
 627                 ret = -EINVAL;
 628         }
 629
 630         return ret;
 631 }
 632
 633 static void omap3_pm_finish(void)
 634 {
 635         enable_hlt();
 636 }
 637
 638 /* Hooks to enable / disable UART interrupts during suspend */
 639 static int omap3_pm_begin(suspend_state_t state)
 640 {
 641         suspend_state = state;
 642         omap_uart_enable_irqs(0);
 643         return 0;
 644 }
 645
 646 static void omap3_pm_end(void)
 647 {
 648         suspend_state = PM_SUSPEND_ON;
 649         omap_uart_enable_irqs(1);
 650         return;
 651 }
 652
 653 static struct platform_suspend_ops omap_pm_ops = {
 654         .begin          = omap3_pm_begin,
 655         .end            = omap3_pm_end,
 656         .prepare        = omap3_pm_prepare,
 657         .enter          = omap3_pm_enter,
 658         .finish         = omap3_pm_finish,
 659         .valid          = suspend_valid_only_mem,
 660 };
 661 #endif /* CONFIG_SUSPEND */
 662
 663
 664 /**
 665  * omap3_iva_idle(): ensure IVA is in idle so it can be put into
 666  *                   retention
 667  *
 668  * In cases where IVA2 is activated by bootcode, it may prevent
 669  * full-chip retention or off-mode because it is not idle.  This
 670  * function forces the IVA2 into idle state so it can go
 671  * into retention/off and thus allow full-chip retention/off.
 672  *
 673  **/
 674 static void __init omap3_iva_idle(void)
 675 {
 676         /* ensure IVA2 clock is disabled */
 677         cm_write_mod_reg(0, OMAP3430_IVA2_MOD, CM_FCLKEN);
 678
 679         /* if no clock activity, nothing else to do */
 680         if (!(cm_read_mod_reg(OMAP3430_IVA2_MOD, OMAP3430_CM_CLKSTST) &
 681               OMAP3430_CLKACTIVITY_IVA2_MASK))
 682                 return;
 683
 684         /* Reset IVA2 */
 685         prm_write_mod_reg(OMAP3430_RST1_IVA2 |
 686                           OMAP3430_RST2_IVA2 |
 687                           OMAP3430_RST3_IVA2,
 688                           OMAP3430_IVA2_MOD, RM_RSTCTRL);
 689
 690         /* Enable IVA2 clock */
 691         cm_write_mod_reg(OMAP3430_CM_FCLKEN_IVA2_EN_IVA2,
 692                          OMAP3430_IVA2_MOD, CM_FCLKEN);
 693
 694         /* Set IVA2 boot mode to 'idle' */
 695         omap_ctrl_writel(OMAP3_IVA2_BOOTMOD_IDLE,
 696                          OMAP343X_CONTROL_IVA2_BOOTMOD);
 697
 698         /* Un-reset IVA2 */
 699         prm_write_mod_reg(0, OMAP3430_IVA2_MOD, RM_RSTCTRL);
 700
 701         /* Disable IVA2 clock */
 702         cm_write_mod_reg(0, OMAP3430_IVA2_MOD, CM_FCLKEN);
 703
 704         /* Reset IVA2 */
 705         prm_write_mod_reg(OMAP3430_RST1_IVA2 |
 706                           OMAP3430_RST2_IVA2 |
 707                           OMAP3430_RST3_IVA2,
 708                           OMAP3430_IVA2_MOD, RM_RSTCTRL);
 709 }
 710
 711 static void __init omap3_d2d_idle(void)
 712 {
 713         u16 mask, padconf;
 714
 715         /* In a stand alone OMAP3430 where there is not a stacked
 716          * modem for the D2D Idle Ack and D2D MStandby must be pulled
 717          * high. S CONTROL_PADCONF_SAD2D_IDLEACK and
 718          * CONTROL_PADCONF_SAD2D_MSTDBY to have a pull up. */
 719         mask = (1 << 4) | (1 << 3); /* pull-up, enabled */
 720         padconf = omap_ctrl_readw(OMAP3_PADCONF_SAD2D_MSTANDBY);
 721         padconf |= mask;
 722         omap_ctrl_writew(padconf, OMAP3_PADCONF_SAD2D_MSTANDBY);
 723
 724         padconf = omap_ctrl_readw(OMAP3_PADCONF_SAD2D_IDLEACK);
 725         padconf |= mask;
 726         omap_ctrl_writew(padconf, OMAP3_PADCONF_SAD2D_IDLEACK);
 727
 728         /* reset modem */
 729         prm_write_mod_reg(OMAP3430_RM_RSTCTRL_CORE_MODEM_SW_RSTPWRON |
 730                           OMAP3430_RM_RSTCTRL_CORE_MODEM_SW_RST,
 731                           CORE_MOD, RM_RSTCTRL);
 732         prm_write_mod_reg(0, CORE_MOD, RM_RSTCTRL);
 733 }
 734
 735 static void __init prcm_setup_regs(void)
 736 {
 737         /* XXX Reset all wkdeps. This should be done when initializing
 738          * powerdomains */
 739         prm_write_mod_reg(0, OMAP3430_IVA2_MOD, PM_WKDEP);
 740         prm_write_mod_reg(0, MPU_MOD, PM_WKDEP);
 741         prm_write_mod_reg(0, OMAP3430_DSS_MOD, PM_WKDEP);
 742         prm_write_mod_reg(0, OMAP3430_NEON_MOD, PM_WKDEP);
 743         prm_write_mod_reg(0, OMAP3430_CAM_MOD, PM_WKDEP);
 744         prm_write_mod_reg(0, OMAP3430_PER_MOD, PM_WKDEP);
 745         if (omap_rev() > OMAP3430_REV_ES1_0) {
 746                 prm_write_mod_reg(0, OMAP3430ES2_SGX_MOD, PM_WKDEP);
 747                 prm_write_mod_reg(0, OMAP3430ES2_USBHOST_MOD, PM_WKDEP);
 748         } else
 749                 prm_write_mod_reg(0, GFX_MOD, PM_WKDEP);
 750
 751         /*
 752          * Enable interface clock autoidle for all modules.
 753          * Note that in the long run this should be done by clockfw
 754          */
 755         cm_write_mod_reg(
 756                 OMAP3430_AUTO_MODEM |
 757                 OMAP3430ES2_AUTO_MMC3 |
 758                 OMAP3430ES2_AUTO_ICR |
 759                 OMAP3430_AUTO_AES2 |
 760                 OMAP3430_AUTO_SHA12 |
 761                 OMAP3430_AUTO_DES2 |
 762                 OMAP3430_AUTO_MMC2 |
 763                 OMAP3430_AUTO_MMC1 |
 764                 OMAP3430_AUTO_MSPRO |
 765                 OMAP3430_AUTO_HDQ |
 766                 OMAP3430_AUTO_MCSPI4 |
 767                 OMAP3430_AUTO_MCSPI3 |
 768                 OMAP3430_AUTO_MCSPI2 |
 769                 OMAP3430_AUTO_MCSPI1 |
 770                 OMAP3430_AUTO_I2C3 |
 771                 OMAP3430_AUTO_I2C2 |
 772                 OMAP3430_AUTO_I2C1 |
 773                 OMAP3430_AUTO_UART2 |
 774                 OMAP3430_AUTO_UART1 |
 775                 OMAP3430_AUTO_GPT11 |
 776                 OMAP3430_AUTO_GPT10 |
 777                 OMAP3430_AUTO_MCBSP5 |
 778                 OMAP3430_AUTO_MCBSP1 |
 779                 OMAP3430ES1_AUTO_FAC | /* This is es1 only */
 780                 OMAP3430_AUTO_MAILBOXES |
 781                 OMAP3430_AUTO_OMAPCTRL |
 782                 OMAP3430ES1_AUTO_FSHOSTUSB |
 783                 OMAP3430_AUTO_HSOTGUSB |
 784                 OMAP3430_AUTO_SAD2D |
 785                 OMAP3430_AUTO_SSI,
 786                 CORE_MOD, CM_AUTOIDLE1);
 787
 788         cm_write_mod_reg(
 789                 OMAP3430_AUTO_PKA |
 790                 OMAP3430_AUTO_AES1 |
 791                 OMAP3430_AUTO_RNG |
 792                 OMAP3430_AUTO_SHA11 |
 793                 OMAP3430_AUTO_DES1,
 794                 CORE_MOD, CM_AUTOIDLE2);
 795
 796         if (omap_rev() > OMAP3430_REV_ES1_0) {
 797                 cm_write_mod_reg(
 798                         OMAP3430_AUTO_MAD2D |
 799                         OMAP3430ES2_AUTO_USBTLL,
 800                         CORE_MOD, CM_AUTOIDLE3);
 801         }
 802
 803         cm_write_mod_reg(
 804                 OMAP3430_AUTO_WDT2 |
 805                 OMAP3430_AUTO_WDT1 |
 806                 OMAP3430_AUTO_GPIO1 |
 807                 OMAP3430_AUTO_32KSYNC |
 808                 OMAP3430_AUTO_GPT12 |
 809                 OMAP3430_AUTO_GPT1 ,
 810                 WKUP_MOD, CM_AUTOIDLE);
 811
 812         cm_write_mod_reg(
 813                 OMAP3430_AUTO_DSS,
 814                 OMAP3430_DSS_MOD,
 815                 CM_AUTOIDLE);
 816
 817         cm_write_mod_reg(
 818                 OMAP3430_AUTO_CAM,
 819                 OMAP3430_CAM_MOD,
 820                 CM_AUTOIDLE);
 821
 822         cm_write_mod_reg(
 823                 OMAP3430_AUTO_GPIO6 |
 824                 OMAP3430_AUTO_GPIO5 |
 825                 OMAP3430_AUTO_GPIO4 |
 826                 OMAP3430_AUTO_GPIO3 |
 827                 OMAP3430_AUTO_GPIO2 |
 828                 OMAP3430_AUTO_WDT3 |
 829                 OMAP3430_AUTO_UART3 |
 830                 OMAP3430_AUTO_GPT9 |
 831                 OMAP3430_AUTO_GPT8 |
 832                 OMAP3430_AUTO_GPT7 |
 833                 OMAP3430_AUTO_GPT6 |
 834                 OMAP3430_AUTO_GPT5 |
 835                 OMAP3430_AUTO_GPT4 |
 836                 OMAP3430_AUTO_GPT3 |
 837                 OMAP3430_AUTO_GPT2 |
 838                 OMAP3430_AUTO_MCBSP4 |
 839                 OMAP3430_AUTO_MCBSP3 |
 840                 OMAP3430_AUTO_MCBSP2,
 841                 OMAP3430_PER_MOD,
 842                 CM_AUTOIDLE);
 843
 844         if (omap_rev() > OMAP3430_REV_ES1_0) {
 845                 cm_write_mod_reg(
 846                         OMAP3430ES2_AUTO_USBHOST,
 847                         OMAP3430ES2_USBHOST_MOD,
 848                         CM_AUTOIDLE);
 849         }
 850
 851         omap_ctrl_writel(OMAP3430_AUTOIDLE, OMAP2_CONTROL_SYSCONFIG);
 852
 853         /*
 854          * Set all plls to autoidle. This is needed until autoidle is
 855          * enabled by clockfw
 856          */
 857         cm_write_mod_reg(1 << OMAP3430_AUTO_IVA2_DPLL_SHIFT,
 858                          OMAP3430_IVA2_MOD, CM_AUTOIDLE2);
 859         cm_write_mod_reg(1 << OMAP3430_AUTO_MPU_DPLL_SHIFT,
 860                          MPU_MOD,
 861                          CM_AUTOIDLE2);
 862         cm_write_mod_reg((1 << OMAP3430_AUTO_PERIPH_DPLL_SHIFT) |
 863                          (1 << OMAP3430_AUTO_CORE_DPLL_SHIFT),
 864                          PLL_MOD,
 865                          CM_AUTOIDLE);
 866         cm_write_mod_reg(1 << OMAP3430ES2_AUTO_PERIPH2_DPLL_SHIFT,
 867                          PLL_MOD,
 868                          CM_AUTOIDLE2);
 869
 870         /*
 871          * Enable control of expternal oscillator through
 872          * sys_clkreq. In the long run clock framework should
 873          * take care of this.
 874          */
 875         prm_rmw_mod_reg_bits(OMAP_AUTOEXTCLKMODE_MASK,
 876                              1 << OMAP_AUTOEXTCLKMODE_SHIFT,
 877                              OMAP3430_GR_MOD,
 878                              OMAP3_PRM_CLKSRC_CTRL_OFFSET);
 879
 880         /* setup wakup source */
 881         prm_write_mod_reg(OMAP3430_EN_IO | OMAP3430_EN_GPIO1 |
 882                           OMAP3430_EN_GPT1 | OMAP3430_EN_GPT12,
 883                           WKUP_MOD, PM_WKEN);
 884         /* No need to write EN_IO, that is always enabled */
 885         prm_write_mod_reg(OMAP3430_EN_GPIO1 | OMAP3430_EN_GPT1 |
 886                           OMAP3430_EN_GPT12,
 887                           WKUP_MOD, OMAP3430_PM_MPUGRPSEL);
 888         /* For some reason IO doesn't generate wakeup event even if
 889          * it is selected to mpu wakeup goup */
 890         prm_write_mod_reg(OMAP3430_IO_EN | OMAP3430_WKUP_EN,
 891                           OCP_MOD, OMAP3_PRM_IRQENABLE_MPU_OFFSET);
 892
 893         /* Enable PM_WKEN to support DSS LPR */
 894         prm_write_mod_reg(OMAP3430_PM_WKEN_DSS_EN_DSS,
 895                                 OMAP3430_DSS_MOD, PM_WKEN);
 896
 897         /* Enable wakeups in PER */
 898         prm_write_mod_reg(OMAP3430_EN_GPIO2 | OMAP3430_EN_GPIO3 |
 899                           OMAP3430_EN_GPIO4 | OMAP3430_EN_GPIO5 |
 900                           OMAP3430_EN_GPIO6 | OMAP3430_EN_UART3 |
 901                           OMAP3430_EN_MCBSP2 | OMAP3430_EN_MCBSP3 |
 902                           OMAP3430_EN_MCBSP4,
 903                           OMAP3430_PER_MOD, PM_WKEN);
 904         /* and allow them to wake up MPU */
 905         prm_write_mod_reg(OMAP3430_GRPSEL_GPIO2 | OMAP3430_EN_GPIO3 |
 906                           OMAP3430_GRPSEL_GPIO4 | OMAP3430_EN_GPIO5 |
 907                           OMAP3430_GRPSEL_GPIO6 | OMAP3430_EN_UART3 |
 908                           OMAP3430_EN_MCBSP2 | OMAP3430_EN_MCBSP3 |
 909                           OMAP3430_EN_MCBSP4,
 910                           OMAP3430_PER_MOD, OMAP3430_PM_MPUGRPSEL);
 911
 912         /* Don't attach IVA interrupts */
 913         prm_write_mod_reg(0, WKUP_MOD, OMAP3430_PM_IVAGRPSEL);
 914         prm_write_mod_reg(0, CORE_MOD, OMAP3430_PM_IVAGRPSEL1);
 915         prm_write_mod_reg(0, CORE_MOD, OMAP3430ES2_PM_IVAGRPSEL3);
 916         prm_write_mod_reg(0, OMAP3430_PER_MOD, OMAP3430_PM_IVAGRPSEL);
 917
 918         /* Clear any pending 'reset' flags */
 919         prm_write_mod_reg(0xffffffff, MPU_MOD, RM_RSTST);
 920         prm_write_mod_reg(0xffffffff, CORE_MOD, RM_RSTST);
 921         prm_write_mod_reg(0xffffffff, OMAP3430_PER_MOD, RM_RSTST);
 922         prm_write_mod_reg(0xffffffff, OMAP3430_EMU_MOD, RM_RSTST);
 923         prm_write_mod_reg(0xffffffff, OMAP3430_NEON_MOD, RM_RSTST);
 924         prm_write_mod_reg(0xffffffff, OMAP3430_DSS_MOD, RM_RSTST);
 925         prm_write_mod_reg(0xffffffff, OMAP3430ES2_USBHOST_MOD, RM_RSTST);
 926
 927         /* Clear any pending PRCM interrupts */
 928         prm_write_mod_reg(0, OCP_MOD, OMAP3_PRM_IRQSTATUS_MPU_OFFSET);
 929
 930         omap3_iva_idle();
 931         omap3_d2d_idle();
 932 }
 933
 934 void omap3_pm_off_mode_enable(int enable)
 935 {
 936         struct power_state *pwrst;
 937         u32 state;
 938
 939         if (enable)
 940                 state = PWRDM_POWER_OFF;
 941         else
 942                 state = PWRDM_POWER_RET;
 943
 944         list_for_each_entry(pwrst, &pwrst_list, node) {
 945                 pwrst->next_state = state;
 946                 set_pwrdm_state(pwrst->pwrdm, state);
 947         }
 948 }
 949
 950 int omap3_pm_get_suspend_state(struct powerdomain *pwrdm)
 951 {
 952         struct power_state *pwrst;
 953
 954         list_for_each_entry(pwrst, &pwrst_list, node) {
 955                 if (pwrst->pwrdm == pwrdm)
 956                         return pwrst->next_state;
 957         }
 958         return -EINVAL;
 959 }
 960
 961 int omap3_pm_set_suspend_state(struct powerdomain *pwrdm, int state)
 962 {
 963         struct power_state *pwrst;
 964
 965         list_for_each_entry(pwrst, &pwrst_list, node) {
 966                 if (pwrst->pwrdm == pwrdm) {
 967                         pwrst->next_state = state;
 968                         return 0;
 969                 }
 970         }
 971         return -EINVAL;
 972 }
 973
 974 static int __init pwrdms_setup(struct powerdomain *pwrdm, void *unused)
 975 {
 976         struct power_state *pwrst;
 977
 978         if (!pwrdm->pwrsts)
 979                 return 0;
 980
 981         pwrst = kmalloc(sizeof(struct power_state), GFP_ATOMIC);
 982         if (!pwrst)
 983                 return -ENOMEM;
 984         pwrst->pwrdm = pwrdm;
 985         pwrst->next_state = PWRDM_POWER_RET;
 986         list_add(&pwrst->node, &pwrst_list);
 987
 988         if (pwrdm_has_hdwr_sar(pwrdm))
 989                 pwrdm_enable_hdwr_sar(pwrdm);
 990
 991         return set_pwrdm_state(pwrst->pwrdm, pwrst->next_state);
 992 }
 993
 994 /*
 995  * Enable hw supervised mode for all clockdomains if it's
 996  * supported. Initiate sleep transition for other clockdomains, if
 997  * they are not used
 998  */
 999 static int __init clkdms_setup(struct clockdomain *clkdm, void *unused)
1000 {
1001         if (clkdm->flags & CLKDM_CAN_ENABLE_AUTO)
1002                 omap2_clkdm_allow_idle(clkdm);
1003         else if (clkdm->flags & CLKDM_CAN_FORCE_SLEEP &&
1004                  atomic_read(&clkdm->usecount) == 0)
1005                 omap2_clkdm_sleep(clkdm);
1006         return 0;
1007 }
1008
1009 void omap_push_sram_idle(void)
1010 {
1011         _omap_sram_idle = omap_sram_push(omap34xx_cpu_suspend,
1012                                         omap34xx_cpu_suspend_sz);
1013         if (omap_type() != OMAP2_DEVICE_TYPE_GP)
1014                 _omap_save_secure_sram = omap_sram_push(save_secure_ram_context,
1015                                 save_secure_ram_context_sz);
1016 }
1017
1018 static int __init omap3_pm_init(void)
1019 {
1020         struct power_state *pwrst, *tmp;
1021         int ret;
1022
1023         if (!cpu_is_omap34xx())
1024                 return -ENODEV;
1025
1026         printk(KERN_ERR "Power Management for TI OMAP3.\n");
1027
1028         /* XXX prcm_setup_regs needs to be before enabling hw
1029          * supervised mode for powerdomains */
1030         prcm_setup_regs();
1031
1032         ret = request_irq(INT_34XX_PRCM_MPU_IRQ,
1033                           (irq_handler_t)prcm_interrupt_handler,
1034                           IRQF_DISABLED, "prcm", NULL);
1035         if (ret) {
1036                 printk(KERN_ERR "request_irq failed to register for 0x%x\n",
1037                        INT_34XX_PRCM_MPU_IRQ);
1038                 goto err1;
1039         }
1040
1041         ret = pwrdm_for_each(pwrdms_setup, NULL);
1042         if (ret) {
1043                 printk(KERN_ERR "Failed to setup powerdomains\n");
1044                 goto err2;
1045         }
1046
1047         (void) clkdm_for_each(clkdms_setup, NULL);
1048
1049         mpu_pwrdm = pwrdm_lookup("mpu_pwrdm");
1050         if (mpu_pwrdm == NULL) {
1051                 printk(KERN_ERR "Failed to get mpu_pwrdm\n");
1052                 goto err2;
1053         }
1054
1055         neon_pwrdm = pwrdm_lookup("neon_pwrdm");
1056         per_pwrdm = pwrdm_lookup("per_pwrdm");
1057         core_pwrdm = pwrdm_lookup("core_pwrdm");
1058         cam_pwrdm = pwrdm_lookup("cam_pwrdm");
1059
1060         omap_push_sram_idle();
1061 #ifdef CONFIG_SUSPEND
1062         suspend_set_ops(&omap_pm_ops);
1063 #endif /* CONFIG_SUSPEND */
1064
1065         pm_idle = omap3_pm_idle;
1066         omap3_idle_init();
1067
1068         pwrdm_add_wkdep(neon_pwrdm, mpu_pwrdm);
1069         /*
1070          * REVISIT: This wkdep is only necessary when GPIO2-6 are enabled for
1071          * IO-pad wakeup.  Otherwise it will unnecessarily waste power
1072          * waking up PER with every CORE wakeup - see
1073          * http://marc.info/?l=linux-omap&m=121852150710062&w=2
1074         */
1075         pwrdm_add_wkdep(per_pwrdm, core_pwrdm);
1076
1077         if (omap_type() != OMAP2_DEVICE_TYPE_GP) {
1078                 omap3_secure_ram_storage =
1079                         kmalloc(0x803F, GFP_KERNEL);
1080                 if (!omap3_secure_ram_storage)
1081                         printk(KERN_ERR "Memory allocation failed when"
1082                                         "allocating for secure sram context\n");
1083
1084                 local_irq_disable();
1085                 local_fiq_disable();
1086
1087                 omap_dma_global_context_save();
1088                 omap3_save_secure_ram_context(PWRDM_POWER_ON);
1089                 omap_dma_global_context_restore();
1090
1091                 local_irq_enable();
1092                 local_fiq_enable();
1093         }
1094
1095         omap3_save_scratchpad_contents();
1096 err1:
1097         return ret;
1098 err2:
1099         free_irq(INT_34XX_PRCM_MPU_IRQ, NULL);
1100         list_for_each_entry_safe(pwrst, tmp, &pwrst_list, node) {
1101                 list_del(&pwrst->node);
1102                 kfree(pwrst);
1103         }
1104         return ret;
1105 }
1106
1107 late_initcall(omap3_pm_init);