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