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 #include <linux/console.h>
  32
  33 #include <plat/sram.h>
  34 #include "clockdomain.h"
  35 #include "powerdomain.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
  42 #include <asm/tlbflush.h>
  43
  44 #include "cm2xxx_3xxx.h"
  45 #include "cm-regbits-34xx.h"
  46 #include "prm-regbits-34xx.h"
  47
  48 #include "prm2xxx_3xxx.h"
  49 #include "pm.h"
  50 #include "sdrc.h"
  51 #include "control.h"
  52
  53 #ifdef CONFIG_SUSPEND
  54 static suspend_state_t suspend_state = PM_SUSPEND_ON;
  55 static inline bool is_suspending(void)
  56 {
  57         return (suspend_state != PM_SUSPEND_ON);
  58 }
  59 #else
  60 static inline bool is_suspending(void)
  61 {
  62         return false;
  63 }
  64 #endif
  65
  66 /* Scratchpad offsets */
  67 #define OMAP343X_TABLE_ADDRESS_OFFSET      0xc4
  68 #define OMAP343X_TABLE_VALUE_OFFSET        0xc0
  69 #define OMAP343X_CONTROL_REG_VALUE_OFFSET  0xc8
  70
  71 /* pm34xx errata defined in pm.h */
  72 u16 pm34xx_errata;
  73
  74 struct power_state {
  75         struct powerdomain *pwrdm;
  76         u32 next_state;
  77 #ifdef CONFIG_SUSPEND
  78         u32 saved_state;
  79 #endif
  80         struct list_head node;
  81 };
  82
  83 static LIST_HEAD(pwrst_list);
  84
  85 static void (*_omap_sram_idle)(u32 *addr, int save_state);
  86
  87 static int (*_omap_save_secure_sram)(u32 *addr);
  88
  89 static struct powerdomain *mpu_pwrdm, *neon_pwrdm;
  90 static struct powerdomain *core_pwrdm, *per_pwrdm;
  91 static struct powerdomain *cam_pwrdm;
  92
  93 static inline void omap3_per_save_context(void)
  94 {
  95         omap_gpio_save_context();
  96 }
  97
  98 static inline void omap3_per_restore_context(void)
  99 {
 100         omap_gpio_restore_context();
 101 }
 102
 103 static void omap3_enable_io_chain(void)
 104 {
 105         int timeout = 0;
 106
 107         if (omap_rev() >= OMAP3430_REV_ES3_1) {
 108                 omap2_prm_set_mod_reg_bits(OMAP3430_EN_IO_CHAIN_MASK, WKUP_MOD,
 109                                      PM_WKEN);
 110                 /* Do a readback to assure write has been done */
 111                 omap2_prm_read_mod_reg(WKUP_MOD, PM_WKEN);
 112
 113                 while (!(omap2_prm_read_mod_reg(WKUP_MOD, PM_WKEN) &
 114                          OMAP3430_ST_IO_CHAIN_MASK)) {
 115                         timeout++;
 116                         if (timeout > 1000) {
 117                                 printk(KERN_ERR "Wake up daisy chain "
 118                                        "activation failed.\n");
 119                                 return;
 120                         }
 121                         omap2_prm_set_mod_reg_bits(OMAP3430_ST_IO_CHAIN_MASK,
 122                                              WKUP_MOD, PM_WKEN);
 123                 }
 124         }
 125 }
 126
 127 static void omap3_disable_io_chain(void)
 128 {
 129         if (omap_rev() >= OMAP3430_REV_ES3_1)
 130                 omap2_prm_clear_mod_reg_bits(OMAP3430_EN_IO_CHAIN_MASK, WKUP_MOD,
 131                                        PM_WKEN);
 132 }
 133
 134 static void omap3_core_save_context(void)
 135 {
 136         omap3_ctrl_save_padconf();
 137
 138         /*
 139          * Force write last pad into memory, as this can fail in some
 140          * cases according to errata 1.157, 1.185
 141          */
 142         omap_ctrl_writel(omap_ctrl_readl(OMAP343X_PADCONF_ETK_D14),
 143                 OMAP343X_CONTROL_MEM_WKUP + 0x2a0);
 144
 145         /* Save the Interrupt controller context */
 146         omap_intc_save_context();
 147         /* Save the GPMC context */
 148         omap3_gpmc_save_context();
 149         /* Save the system control module context, padconf already save above*/
 150         omap3_control_save_context();
 151         omap_dma_global_context_save();
 152 }
 153
 154 static void omap3_core_restore_context(void)
 155 {
 156         /* Restore the control module context, padconf restored by h/w */
 157         omap3_control_restore_context();
 158         /* Restore the GPMC context */
 159         omap3_gpmc_restore_context();
 160         /* Restore the interrupt controller context */
 161         omap_intc_restore_context();
 162         omap_dma_global_context_restore();
 163 }
 164
 165 /*
 166  * FIXME: This function should be called before entering off-mode after
 167  * OMAP3 secure services have been accessed. Currently it is only called
 168  * once during boot sequence, but this works as we are not using secure
 169  * services.
 170  */
 171 static void omap3_save_secure_ram_context(void)
 172 {
 173         u32 ret;
 174         int mpu_next_state = pwrdm_read_next_pwrst(mpu_pwrdm);
 175
 176         if (omap_type() != OMAP2_DEVICE_TYPE_GP) {
 177                 /*
 178                  * MPU next state must be set to POWER_ON temporarily,
 179                  * otherwise the WFI executed inside the ROM code
 180                  * will hang the system.
 181                  */
 182                 pwrdm_set_next_pwrst(mpu_pwrdm, PWRDM_POWER_ON);
 183                 ret = _omap_save_secure_sram((u32 *)
 184                                 __pa(omap3_secure_ram_storage));
 185                 pwrdm_set_next_pwrst(mpu_pwrdm, mpu_next_state);
 186                 /* Following is for error tracking, it should not happen */
 187                 if (ret) {
 188                         printk(KERN_ERR "save_secure_sram() returns %08x\n",
 189                                 ret);
 190                         while (1)
 191                                 ;
 192                 }
 193         }
 194 }
 195
 196 /*
 197  * PRCM Interrupt Handler Helper Function
 198  *
 199  * The purpose of this function is to clear any wake-up events latched
 200  * in the PRCM PM_WKST_x registers. It is possible that a wake-up event
 201  * may occur whilst attempting to clear a PM_WKST_x register and thus
 202  * set another bit in this register. A while loop is used to ensure
 203  * that any peripheral wake-up events occurring while attempting to
 204  * clear the PM_WKST_x are detected and cleared.
 205  */
 206 static int prcm_clear_mod_irqs(s16 module, u8 regs)
 207 {
 208         u32 wkst, fclk, iclk, clken;
 209         u16 wkst_off = (regs == 3) ? OMAP3430ES2_PM_WKST3 : PM_WKST1;
 210         u16 fclk_off = (regs == 3) ? OMAP3430ES2_CM_FCLKEN3 : CM_FCLKEN1;
 211         u16 iclk_off = (regs == 3) ? CM_ICLKEN3 : CM_ICLKEN1;
 212         u16 grpsel_off = (regs == 3) ?
 213                 OMAP3430ES2_PM_MPUGRPSEL3 : OMAP3430_PM_MPUGRPSEL;
 214         int c = 0;
 215
 216         wkst = omap2_prm_read_mod_reg(module, wkst_off);
 217         wkst &= omap2_prm_read_mod_reg(module, grpsel_off);
 218         if (wkst) {
 219                 iclk = omap2_cm_read_mod_reg(module, iclk_off);
 220                 fclk = omap2_cm_read_mod_reg(module, fclk_off);
 221                 while (wkst) {
 222                         clken = wkst;
 223                         omap2_cm_set_mod_reg_bits(clken, module, iclk_off);
 224                         /*
 225                          * For USBHOST, we don't know whether HOST1 or
 226                          * HOST2 woke us up, so enable both f-clocks
 227                          */
 228                         if (module == OMAP3430ES2_USBHOST_MOD)
 229                                 clken |= 1 << OMAP3430ES2_EN_USBHOST2_SHIFT;
 230                         omap2_cm_set_mod_reg_bits(clken, module, fclk_off);
 231                         omap2_prm_write_mod_reg(wkst, module, wkst_off);
 232                         wkst = omap2_prm_read_mod_reg(module, wkst_off);
 233                         c++;
 234                 }
 235                 omap2_cm_write_mod_reg(iclk, module, iclk_off);
 236                 omap2_cm_write_mod_reg(fclk, module, fclk_off);
 237         }
 238
 239         return c;
 240 }
 241
 242 static int _prcm_int_handle_wakeup(void)
 243 {
 244         int c;
 245
 246         c = prcm_clear_mod_irqs(WKUP_MOD, 1);
 247         c += prcm_clear_mod_irqs(CORE_MOD, 1);
 248         c += prcm_clear_mod_irqs(OMAP3430_PER_MOD, 1);
 249         if (omap_rev() > OMAP3430_REV_ES1_0) {
 250                 c += prcm_clear_mod_irqs(CORE_MOD, 3);
 251                 c += prcm_clear_mod_irqs(OMAP3430ES2_USBHOST_MOD, 1);
 252         }
 253
 254         return c;
 255 }
 256
 257 /*
 258  * PRCM Interrupt Handler
 259  *
 260  * The PRM_IRQSTATUS_MPU register indicates if there are any pending
 261  * interrupts from the PRCM for the MPU. These bits must be cleared in
 262  * order to clear the PRCM interrupt. The PRCM interrupt handler is
 263  * implemented to simply clear the PRM_IRQSTATUS_MPU in order to clear
 264  * the PRCM interrupt. Please note that bit 0 of the PRM_IRQSTATUS_MPU
 265  * register indicates that a wake-up event is pending for the MPU and
 266  * this bit can only be cleared if the all the wake-up events latched
 267  * in the various PM_WKST_x registers have been cleared. The interrupt
 268  * handler is implemented using a do-while loop so that if a wake-up
 269  * event occurred during the processing of the prcm interrupt handler
 270  * (setting a bit in the corresponding PM_WKST_x register and thus
 271  * preventing us from clearing bit 0 of the PRM_IRQSTATUS_MPU register)
 272  * this would be handled.
 273  */
 274 static irqreturn_t prcm_interrupt_handler (int irq, void *dev_id)
 275 {
 276         u32 irqenable_mpu, irqstatus_mpu;
 277         int c = 0;
 278
 279         irqenable_mpu = omap2_prm_read_mod_reg(OCP_MOD,
 280                                          OMAP3_PRM_IRQENABLE_MPU_OFFSET);
 281         irqstatus_mpu = omap2_prm_read_mod_reg(OCP_MOD,
 282                                          OMAP3_PRM_IRQSTATUS_MPU_OFFSET);
 283         irqstatus_mpu &= irqenable_mpu;
 284
 285         do {
 286                 if (irqstatus_mpu & (OMAP3430_WKUP_ST_MASK |
 287                                      OMAP3430_IO_ST_MASK)) {
 288                         c = _prcm_int_handle_wakeup();
 289
 290                         /*
 291                          * Is the MPU PRCM interrupt handler racing with the
 292                          * IVA2 PRCM interrupt handler ?
 293                          */
 294                         WARN(c == 0, "prcm: WARNING: PRCM indicated MPU wakeup "
 295                              "but no wakeup sources are marked\n");
 296                 } else {
 297                         /* XXX we need to expand our PRCM interrupt handler */
 298                         WARN(1, "prcm: WARNING: PRCM interrupt received, but "
 299                              "no code to handle it (%08x)\n", irqstatus_mpu);
 300                 }
 301
 302                 omap2_prm_write_mod_reg(irqstatus_mpu, OCP_MOD,
 303                                         OMAP3_PRM_IRQSTATUS_MPU_OFFSET);
 304
 305                 irqstatus_mpu = omap2_prm_read_mod_reg(OCP_MOD,
 306                                         OMAP3_PRM_IRQSTATUS_MPU_OFFSET);
 307                 irqstatus_mpu &= irqenable_mpu;
 308
 309         } while (irqstatus_mpu);
 310
 311         return IRQ_HANDLED;
 312 }
 313
 314 static void restore_control_register(u32 val)
 315 {
 316         __asm__ __volatile__ ("mcr p15, 0, %0, c1, c0, 0" : : "r" (val));
 317 }
 318
 319 /* Function to restore the table entry that was modified for enabling MMU */
 320 static void restore_table_entry(void)
 321 {
 322         void __iomem *scratchpad_address;
 323         u32 previous_value, control_reg_value;
 324         u32 *address;
 325
 326         scratchpad_address = OMAP2_L4_IO_ADDRESS(OMAP343X_SCRATCHPAD);
 327
 328         /* Get address of entry that was modified */
 329         address = (u32 *)__raw_readl(scratchpad_address +
 330                                      OMAP343X_TABLE_ADDRESS_OFFSET);
 331         /* Get the previous value which needs to be restored */
 332         previous_value = __raw_readl(scratchpad_address +
 333                                      OMAP343X_TABLE_VALUE_OFFSET);
 334         address = __va(address);
 335         *address = previous_value;
 336         flush_tlb_all();
 337         control_reg_value = __raw_readl(scratchpad_address
 338                                         + OMAP343X_CONTROL_REG_VALUE_OFFSET);
 339         /* This will enable caches and prediction */
 340         restore_control_register(control_reg_value);
 341 }
 342
 343 void omap_sram_idle(void)
 344 {
 345         /* Variable to tell what needs to be saved and restored
 346          * in omap_sram_idle*/
 347         /* save_state = 0 => Nothing to save and restored */
 348         /* save_state = 1 => Only L1 and logic lost */
 349         /* save_state = 2 => Only L2 lost */
 350         /* save_state = 3 => L1, L2 and logic lost */
 351         int save_state = 0;
 352         int mpu_next_state = PWRDM_POWER_ON;
 353         int per_next_state = PWRDM_POWER_ON;
 354         int core_next_state = PWRDM_POWER_ON;
 355         int per_going_off;
 356         int core_prev_state, per_prev_state;
 357         u32 sdrc_pwr = 0;
 358
 359         if (!_omap_sram_idle)
 360                 return;
 361
 362         pwrdm_clear_all_prev_pwrst(mpu_pwrdm);
 363         pwrdm_clear_all_prev_pwrst(neon_pwrdm);
 364         pwrdm_clear_all_prev_pwrst(core_pwrdm);
 365         pwrdm_clear_all_prev_pwrst(per_pwrdm);
 366
 367         mpu_next_state = pwrdm_read_next_pwrst(mpu_pwrdm);
 368         switch (mpu_next_state) {
 369         case PWRDM_POWER_ON:
 370         case PWRDM_POWER_RET:
 371                 /* No need to save context */
 372                 save_state = 0;
 373                 break;
 374         case PWRDM_POWER_OFF:
 375                 save_state = 3;
 376                 break;
 377         default:
 378                 /* Invalid state */
 379                 printk(KERN_ERR "Invalid mpu state in sram_idle\n");
 380                 return;
 381         }
 382         pwrdm_pre_transition();
 383
 384         /* NEON control */
 385         if (pwrdm_read_pwrst(neon_pwrdm) == PWRDM_POWER_ON)
 386                 pwrdm_set_next_pwrst(neon_pwrdm, mpu_next_state);
 387
 388         /* Enable IO-PAD and IO-CHAIN wakeups */
 389         per_next_state = pwrdm_read_next_pwrst(per_pwrdm);
 390         core_next_state = pwrdm_read_next_pwrst(core_pwrdm);
 391         if (omap3_has_io_wakeup() &&
 392             (per_next_state < PWRDM_POWER_ON ||
 393              core_next_state < PWRDM_POWER_ON)) {
 394                 omap2_prm_set_mod_reg_bits(OMAP3430_EN_IO_MASK, WKUP_MOD, PM_WKEN);
 395                 omap3_enable_io_chain();
 396         }
 397
 398         /* Block console output in case it is on one of the OMAP UARTs */
 399         if (!is_suspending())
 400                 if (per_next_state < PWRDM_POWER_ON ||
 401                     core_next_state < PWRDM_POWER_ON)
 402                         if (!console_trylock())
 403                                 goto console_still_active;
 404
 405         /* PER */
 406         if (per_next_state < PWRDM_POWER_ON) {
 407                 per_going_off = (per_next_state == PWRDM_POWER_OFF) ? 1 : 0;
 408                 omap_uart_prepare_idle(2);
 409                 omap_uart_prepare_idle(3);
 410                 omap2_gpio_prepare_for_idle(per_going_off);
 411                 if (per_next_state == PWRDM_POWER_OFF)
 412                                 omap3_per_save_context();
 413         }
 414
 415         /* CORE */
 416         if (core_next_state < PWRDM_POWER_ON) {
 417                 omap_uart_prepare_idle(0);
 418                 omap_uart_prepare_idle(1);
 419                 if (core_next_state == PWRDM_POWER_OFF) {
 420                         omap3_core_save_context();
 421                         omap3_cm_save_context();
 422                 }
 423         }
 424
 425         omap3_intc_prepare_idle();
 426
 427         /*
 428         * On EMU/HS devices ROM code restores a SRDC value
 429         * from scratchpad which has automatic self refresh on timeout
 430         * of AUTO_CNT = 1 enabled. This takes care of erratum ID i443.
 431         * Hence store/restore the SDRC_POWER register here.
 432         */
 433         if (omap_rev() >= OMAP3430_REV_ES3_0 &&
 434             omap_type() != OMAP2_DEVICE_TYPE_GP &&
 435             core_next_state == PWRDM_POWER_OFF)
 436                 sdrc_pwr = sdrc_read_reg(SDRC_POWER);
 437
 438         /*
 439          * omap3_arm_context is the location where ARM registers
 440          * get saved. The restore path then reads from this
 441          * location and restores them back.
 442          */
 443         _omap_sram_idle(omap3_arm_context, save_state);
 444         cpu_init();
 445
 446         /* Restore normal SDRC POWER settings */
 447         if (omap_rev() >= OMAP3430_REV_ES3_0 &&
 448             omap_type() != OMAP2_DEVICE_TYPE_GP &&
 449             core_next_state == PWRDM_POWER_OFF)
 450                 sdrc_write_reg(sdrc_pwr, SDRC_POWER);
 451
 452         /* Restore table entry modified during MMU restoration */
 453         if (pwrdm_read_prev_pwrst(mpu_pwrdm) == PWRDM_POWER_OFF)
 454                 restore_table_entry();
 455
 456         /* CORE */
 457         if (core_next_state < PWRDM_POWER_ON) {
 458                 core_prev_state = pwrdm_read_prev_pwrst(core_pwrdm);
 459                 if (core_prev_state == PWRDM_POWER_OFF) {
 460                         omap3_core_restore_context();
 461                         omap3_cm_restore_context();
 462                         omap3_sram_restore_context();
 463                         omap2_sms_restore_context();
 464                 }
 465                 omap_uart_resume_idle(0);
 466                 omap_uart_resume_idle(1);
 467                 if (core_next_state == PWRDM_POWER_OFF)
 468                         omap2_prm_clear_mod_reg_bits(OMAP3430_AUTO_OFF_MASK,
 469                                                OMAP3430_GR_MOD,
 470                                                OMAP3_PRM_VOLTCTRL_OFFSET);
 471         }
 472         omap3_intc_resume_idle();
 473
 474         /* PER */
 475         if (per_next_state < PWRDM_POWER_ON) {
 476                 per_prev_state = pwrdm_read_prev_pwrst(per_pwrdm);
 477                 omap2_gpio_resume_after_idle();
 478                 if (per_prev_state == PWRDM_POWER_OFF)
 479                         omap3_per_restore_context();
 480                 omap_uart_resume_idle(2);
 481                 omap_uart_resume_idle(3);
 482         }
 483
 484         if (!is_suspending())
 485                 console_unlock();
 486
 487 console_still_active:
 488         /* Disable IO-PAD and IO-CHAIN wakeup */
 489         if (omap3_has_io_wakeup() &&
 490             (per_next_state < PWRDM_POWER_ON ||
 491              core_next_state < PWRDM_POWER_ON)) {
 492                 omap2_prm_clear_mod_reg_bits(OMAP3430_EN_IO_MASK, WKUP_MOD,
 493                                              PM_WKEN);
 494                 omap3_disable_io_chain();
 495         }
 496
 497         pwrdm_post_transition();
 498
 499         clkdm_allow_idle(mpu_pwrdm->pwrdm_clkdms[0]);
 500 }
 501
 502 int omap3_can_sleep(void)
 503 {
 504         if (!sleep_while_idle)
 505                 return 0;
 506         if (!omap_uart_can_sleep())
 507                 return 0;
 508         return 1;
 509 }
 510
 511 static void omap3_pm_idle(void)
 512 {
 513         local_irq_disable();
 514         local_fiq_disable();
 515
 516         if (!omap3_can_sleep())
 517                 goto out;
 518
 519         if (omap_irq_pending() || need_resched())
 520                 goto out;
 521
 522         omap_sram_idle();
 523
 524 out:
 525         local_fiq_enable();
 526         local_irq_enable();
 527 }
 528
 529 #ifdef CONFIG_SUSPEND
 530 static int omap3_pm_suspend(void)
 531 {
 532         struct power_state *pwrst;
 533         int state, ret = 0;
 534
 535         if (wakeup_timer_seconds || wakeup_timer_milliseconds)
 536                 omap2_pm_wakeup_on_timer(wakeup_timer_seconds,
 537                                          wakeup_timer_milliseconds);
 538
 539         /* Read current next_pwrsts */
 540         list_for_each_entry(pwrst, &pwrst_list, node)
 541                 pwrst->saved_state = pwrdm_read_next_pwrst(pwrst->pwrdm);
 542         /* Set ones wanted by suspend */
 543         list_for_each_entry(pwrst, &pwrst_list, node) {
 544                 if (omap_set_pwrdm_state(pwrst->pwrdm, pwrst->next_state))
 545                         goto restore;
 546                 if (pwrdm_clear_all_prev_pwrst(pwrst->pwrdm))
 547                         goto restore;
 548         }
 549
 550         omap_uart_prepare_suspend();
 551         omap3_intc_suspend();
 552
 553         omap_sram_idle();
 554
 555 restore:
 556         /* Restore next_pwrsts */
 557         list_for_each_entry(pwrst, &pwrst_list, node) {
 558                 state = pwrdm_read_prev_pwrst(pwrst->pwrdm);
 559                 if (state > pwrst->next_state) {
 560                         printk(KERN_INFO "Powerdomain (%s) didn't enter "
 561                                "target state %d\n",
 562                                pwrst->pwrdm->name, pwrst->next_state);
 563                         ret = -1;
 564                 }
 565                 omap_set_pwrdm_state(pwrst->pwrdm, pwrst->saved_state);
 566         }
 567         if (ret)
 568                 printk(KERN_ERR "Could not enter target state in pm_suspend\n");
 569         else
 570                 printk(KERN_INFO "Successfully put all powerdomains "
 571                        "to target state\n");
 572
 573         return ret;
 574 }
 575
 576 static int omap3_pm_enter(suspend_state_t unused)
 577 {
 578         int ret = 0;
 579
 580         switch (suspend_state) {
 581         case PM_SUSPEND_STANDBY:
 582         case PM_SUSPEND_MEM:
 583                 ret = omap3_pm_suspend();
 584                 break;
 585         default:
 586                 ret = -EINVAL;
 587         }
 588
 589         return ret;
 590 }
 591
 592 /* Hooks to enable / disable UART interrupts during suspend */
 593 static int omap3_pm_begin(suspend_state_t state)
 594 {
 595         disable_hlt();
 596         suspend_state = state;
 597         omap_uart_enable_irqs(0);
 598         return 0;
 599 }
 600
 601 static void omap3_pm_end(void)
 602 {
 603         suspend_state = PM_SUSPEND_ON;
 604         omap_uart_enable_irqs(1);
 605         enable_hlt();
 606         return;
 607 }
 608
 609 static const struct platform_suspend_ops omap_pm_ops = {
 610         .begin          = omap3_pm_begin,
 611         .end            = omap3_pm_end,
 612         .enter          = omap3_pm_enter,
 613         .valid          = suspend_valid_only_mem,
 614 };
 615 #endif /* CONFIG_SUSPEND */
 616
 617
 618 /**
 619  * omap3_iva_idle(): ensure IVA is in idle so it can be put into
 620  *                   retention
 621  *
 622  * In cases where IVA2 is activated by bootcode, it may prevent
 623  * full-chip retention or off-mode because it is not idle.  This
 624  * function forces the IVA2 into idle state so it can go
 625  * into retention/off and thus allow full-chip retention/off.
 626  *
 627  **/
 628 static void __init omap3_iva_idle(void)
 629 {
 630         /* ensure IVA2 clock is disabled */
 631         omap2_cm_write_mod_reg(0, OMAP3430_IVA2_MOD, CM_FCLKEN);
 632
 633         /* if no clock activity, nothing else to do */
 634         if (!(omap2_cm_read_mod_reg(OMAP3430_IVA2_MOD, OMAP3430_CM_CLKSTST) &
 635               OMAP3430_CLKACTIVITY_IVA2_MASK))
 636                 return;
 637
 638         /* Reset IVA2 */
 639         omap2_prm_write_mod_reg(OMAP3430_RST1_IVA2_MASK |
 640                           OMAP3430_RST2_IVA2_MASK |
 641                           OMAP3430_RST3_IVA2_MASK,
 642                           OMAP3430_IVA2_MOD, OMAP2_RM_RSTCTRL);
 643
 644         /* Enable IVA2 clock */
 645         omap2_cm_write_mod_reg(OMAP3430_CM_FCLKEN_IVA2_EN_IVA2_MASK,
 646                          OMAP3430_IVA2_MOD, CM_FCLKEN);
 647
 648         /* Set IVA2 boot mode to 'idle' */
 649         omap_ctrl_writel(OMAP3_IVA2_BOOTMOD_IDLE,
 650                          OMAP343X_CONTROL_IVA2_BOOTMOD);
 651
 652         /* Un-reset IVA2 */
 653         omap2_prm_write_mod_reg(0, OMAP3430_IVA2_MOD, OMAP2_RM_RSTCTRL);
 654
 655         /* Disable IVA2 clock */
 656         omap2_cm_write_mod_reg(0, OMAP3430_IVA2_MOD, CM_FCLKEN);
 657
 658         /* Reset IVA2 */
 659         omap2_prm_write_mod_reg(OMAP3430_RST1_IVA2_MASK |
 660                           OMAP3430_RST2_IVA2_MASK |
 661                           OMAP3430_RST3_IVA2_MASK,
 662                           OMAP3430_IVA2_MOD, OMAP2_RM_RSTCTRL);
 663 }
 664
 665 static void __init omap3_d2d_idle(void)
 666 {
 667         u16 mask, padconf;
 668
 669         /* In a stand alone OMAP3430 where there is not a stacked
 670          * modem for the D2D Idle Ack and D2D MStandby must be pulled
 671          * high. S CONTROL_PADCONF_SAD2D_IDLEACK and
 672          * CONTROL_PADCONF_SAD2D_MSTDBY to have a pull up. */
 673         mask = (1 << 4) | (1 << 3); /* pull-up, enabled */
 674         padconf = omap_ctrl_readw(OMAP3_PADCONF_SAD2D_MSTANDBY);
 675         padconf |= mask;
 676         omap_ctrl_writew(padconf, OMAP3_PADCONF_SAD2D_MSTANDBY);
 677
 678         padconf = omap_ctrl_readw(OMAP3_PADCONF_SAD2D_IDLEACK);
 679         padconf |= mask;
 680         omap_ctrl_writew(padconf, OMAP3_PADCONF_SAD2D_IDLEACK);
 681
 682         /* reset modem */
 683         omap2_prm_write_mod_reg(OMAP3430_RM_RSTCTRL_CORE_MODEM_SW_RSTPWRON_MASK |
 684                           OMAP3430_RM_RSTCTRL_CORE_MODEM_SW_RST_MASK,
 685                           CORE_MOD, OMAP2_RM_RSTCTRL);
 686         omap2_prm_write_mod_reg(0, CORE_MOD, OMAP2_RM_RSTCTRL);
 687 }
 688
 689 static void __init prcm_setup_regs(void)
 690 {
 691         u32 omap3630_en_uart4_mask = cpu_is_omap3630() ?
 692                                         OMAP3630_EN_UART4_MASK : 0;
 693         u32 omap3630_grpsel_uart4_mask = cpu_is_omap3630() ?
 694                                         OMAP3630_GRPSEL_UART4_MASK : 0;
 695
 696         /* XXX Reset all wkdeps. This should be done when initializing
 697          * powerdomains */
 698         omap2_prm_write_mod_reg(0, OMAP3430_IVA2_MOD, PM_WKDEP);
 699         omap2_prm_write_mod_reg(0, MPU_MOD, PM_WKDEP);
 700         omap2_prm_write_mod_reg(0, OMAP3430_DSS_MOD, PM_WKDEP);
 701         omap2_prm_write_mod_reg(0, OMAP3430_NEON_MOD, PM_WKDEP);
 702         omap2_prm_write_mod_reg(0, OMAP3430_CAM_MOD, PM_WKDEP);
 703         omap2_prm_write_mod_reg(0, OMAP3430_PER_MOD, PM_WKDEP);
 704         if (omap_rev() > OMAP3430_REV_ES1_0) {
 705                 omap2_prm_write_mod_reg(0, OMAP3430ES2_SGX_MOD, PM_WKDEP);
 706                 omap2_prm_write_mod_reg(0, OMAP3430ES2_USBHOST_MOD, PM_WKDEP);
 707         } else
 708                 omap2_prm_write_mod_reg(0, GFX_MOD, PM_WKDEP);
 709
 710         /* XXX This should be handled by hwmod code or SCM init code */
 711         omap_ctrl_writel(OMAP3430_AUTOIDLE_MASK, OMAP2_CONTROL_SYSCONFIG);
 712
 713         /*
 714          * Enable control of expternal oscillator through
 715          * sys_clkreq. In the long run clock framework should
 716          * take care of this.
 717          */
 718         omap2_prm_rmw_mod_reg_bits(OMAP_AUTOEXTCLKMODE_MASK,
 719                              1 << OMAP_AUTOEXTCLKMODE_SHIFT,
 720                              OMAP3430_GR_MOD,
 721                              OMAP3_PRM_CLKSRC_CTRL_OFFSET);
 722
 723         /* setup wakup source */
 724         omap2_prm_write_mod_reg(OMAP3430_EN_IO_MASK | OMAP3430_EN_GPIO1_MASK |
 725                           OMAP3430_EN_GPT1_MASK | OMAP3430_EN_GPT12_MASK,
 726                           WKUP_MOD, PM_WKEN);
 727         /* No need to write EN_IO, that is always enabled */
 728         omap2_prm_write_mod_reg(OMAP3430_GRPSEL_GPIO1_MASK |
 729                           OMAP3430_GRPSEL_GPT1_MASK |
 730                           OMAP3430_GRPSEL_GPT12_MASK,
 731                           WKUP_MOD, OMAP3430_PM_MPUGRPSEL);
 732         /* For some reason IO doesn't generate wakeup event even if
 733          * it is selected to mpu wakeup goup */
 734         omap2_prm_write_mod_reg(OMAP3430_IO_EN_MASK | OMAP3430_WKUP_EN_MASK,
 735                           OCP_MOD, OMAP3_PRM_IRQENABLE_MPU_OFFSET);
 736
 737         /* Enable PM_WKEN to support DSS LPR */
 738         omap2_prm_write_mod_reg(OMAP3430_PM_WKEN_DSS_EN_DSS_MASK,
 739                                 OMAP3430_DSS_MOD, PM_WKEN);
 740
 741         /* Enable wakeups in PER */
 742         omap2_prm_write_mod_reg(omap3630_en_uart4_mask |
 743                           OMAP3430_EN_GPIO2_MASK | OMAP3430_EN_GPIO3_MASK |
 744                           OMAP3430_EN_GPIO4_MASK | OMAP3430_EN_GPIO5_MASK |
 745                           OMAP3430_EN_GPIO6_MASK | OMAP3430_EN_UART3_MASK |
 746                           OMAP3430_EN_MCBSP2_MASK | OMAP3430_EN_MCBSP3_MASK |
 747                           OMAP3430_EN_MCBSP4_MASK,
 748                           OMAP3430_PER_MOD, PM_WKEN);
 749         /* and allow them to wake up MPU */
 750         omap2_prm_write_mod_reg(omap3630_grpsel_uart4_mask |
 751                           OMAP3430_GRPSEL_GPIO2_MASK |
 752                           OMAP3430_GRPSEL_GPIO3_MASK |
 753                           OMAP3430_GRPSEL_GPIO4_MASK |
 754                           OMAP3430_GRPSEL_GPIO5_MASK |
 755                           OMAP3430_GRPSEL_GPIO6_MASK |
 756                           OMAP3430_GRPSEL_UART3_MASK |
 757                           OMAP3430_GRPSEL_MCBSP2_MASK |
 758                           OMAP3430_GRPSEL_MCBSP3_MASK |
 759                           OMAP3430_GRPSEL_MCBSP4_MASK,
 760                           OMAP3430_PER_MOD, OMAP3430_PM_MPUGRPSEL);
 761
 762         /* Don't attach IVA interrupts */
 763         omap2_prm_write_mod_reg(0, WKUP_MOD, OMAP3430_PM_IVAGRPSEL);
 764         omap2_prm_write_mod_reg(0, CORE_MOD, OMAP3430_PM_IVAGRPSEL1);
 765         omap2_prm_write_mod_reg(0, CORE_MOD, OMAP3430ES2_PM_IVAGRPSEL3);
 766         omap2_prm_write_mod_reg(0, OMAP3430_PER_MOD, OMAP3430_PM_IVAGRPSEL);
 767
 768         /* Clear any pending 'reset' flags */
 769         omap2_prm_write_mod_reg(0xffffffff, MPU_MOD, OMAP2_RM_RSTST);
 770         omap2_prm_write_mod_reg(0xffffffff, CORE_MOD, OMAP2_RM_RSTST);
 771         omap2_prm_write_mod_reg(0xffffffff, OMAP3430_PER_MOD, OMAP2_RM_RSTST);
 772         omap2_prm_write_mod_reg(0xffffffff, OMAP3430_EMU_MOD, OMAP2_RM_RSTST);
 773         omap2_prm_write_mod_reg(0xffffffff, OMAP3430_NEON_MOD, OMAP2_RM_RSTST);
 774         omap2_prm_write_mod_reg(0xffffffff, OMAP3430_DSS_MOD, OMAP2_RM_RSTST);
 775         omap2_prm_write_mod_reg(0xffffffff, OMAP3430ES2_USBHOST_MOD, OMAP2_RM_RSTST);
 776
 777         /* Clear any pending PRCM interrupts */
 778         omap2_prm_write_mod_reg(0, OCP_MOD, OMAP3_PRM_IRQSTATUS_MPU_OFFSET);
 779
 780         omap3_iva_idle();
 781         omap3_d2d_idle();
 782 }
 783
 784 void omap3_pm_off_mode_enable(int enable)
 785 {
 786         struct power_state *pwrst;
 787         u32 state;
 788
 789         if (enable)
 790                 state = PWRDM_POWER_OFF;
 791         else
 792                 state = PWRDM_POWER_RET;
 793
 794 #ifdef CONFIG_CPU_IDLE
 795         /*
 796          * Erratum i583: implementation for ES rev < Es1.2 on 3630. We cannot
 797          * enable OFF mode in a stable form for previous revisions, restrict
 798          * instead to RET
 799          */
 800         if (IS_PM34XX_ERRATUM(PM_SDRC_WAKEUP_ERRATUM_i583))
 801                 omap3_cpuidle_update_states(state, PWRDM_POWER_RET);
 802         else
 803                 omap3_cpuidle_update_states(state, state);
 804 #endif
 805
 806         list_for_each_entry(pwrst, &pwrst_list, node) {
 807                 if (IS_PM34XX_ERRATUM(PM_SDRC_WAKEUP_ERRATUM_i583) &&
 808                                 pwrst->pwrdm == core_pwrdm &&
 809                                 state == PWRDM_POWER_OFF) {
 810                         pwrst->next_state = PWRDM_POWER_RET;
 811                         WARN_ONCE(1,
 812                                 "%s: Core OFF disabled due to errata i583\n",
 813                                 __func__);
 814                 } else {
 815                         pwrst->next_state = state;
 816                 }
 817                 omap_set_pwrdm_state(pwrst->pwrdm, pwrst->next_state);
 818         }
 819 }
 820
 821 int omap3_pm_get_suspend_state(struct powerdomain *pwrdm)
 822 {
 823         struct power_state *pwrst;
 824
 825         list_for_each_entry(pwrst, &pwrst_list, node) {
 826                 if (pwrst->pwrdm == pwrdm)
 827                         return pwrst->next_state;
 828         }
 829         return -EINVAL;
 830 }
 831
 832 int omap3_pm_set_suspend_state(struct powerdomain *pwrdm, int state)
 833 {
 834         struct power_state *pwrst;
 835
 836         list_for_each_entry(pwrst, &pwrst_list, node) {
 837                 if (pwrst->pwrdm == pwrdm) {
 838                         pwrst->next_state = state;
 839                         return 0;
 840                 }
 841         }
 842         return -EINVAL;
 843 }
 844
 845 static int __init pwrdms_setup(struct powerdomain *pwrdm, void *unused)
 846 {
 847         struct power_state *pwrst;
 848
 849         if (!pwrdm->pwrsts)
 850                 return 0;
 851
 852         pwrst = kmalloc(sizeof(struct power_state), GFP_ATOMIC);
 853         if (!pwrst)
 854                 return -ENOMEM;
 855         pwrst->pwrdm = pwrdm;
 856         pwrst->next_state = PWRDM_POWER_RET;
 857         list_add(&pwrst->node, &pwrst_list);
 858
 859         if (pwrdm_has_hdwr_sar(pwrdm))
 860                 pwrdm_enable_hdwr_sar(pwrdm);
 861
 862         return omap_set_pwrdm_state(pwrst->pwrdm, pwrst->next_state);
 863 }
 864
 865 /*
 866  * Enable hw supervised mode for all clockdomains if it's
 867  * supported. Initiate sleep transition for other clockdomains, if
 868  * they are not used
 869  */
 870 static int __init clkdms_setup(struct clockdomain *clkdm, void *unused)
 871 {
 872         if (clkdm->flags & CLKDM_CAN_ENABLE_AUTO)
 873                 clkdm_allow_idle(clkdm);
 874         else if (clkdm->flags & CLKDM_CAN_FORCE_SLEEP &&
 875                  atomic_read(&clkdm->usecount) == 0)
 876                 clkdm_sleep(clkdm);
 877         return 0;
 878 }
 879
 880 void omap_push_sram_idle(void)
 881 {
 882         _omap_sram_idle = omap_sram_push(omap34xx_cpu_suspend,
 883                                         omap34xx_cpu_suspend_sz);
 884         if (omap_type() != OMAP2_DEVICE_TYPE_GP)
 885                 _omap_save_secure_sram = omap_sram_push(save_secure_ram_context,
 886                                 save_secure_ram_context_sz);
 887 }
 888
 889 static void __init pm_errata_configure(void)
 890 {
 891         if (cpu_is_omap3630()) {
 892                 pm34xx_errata |= PM_RTA_ERRATUM_i608;
 893                 /* Enable the l2 cache toggling in sleep logic */
 894                 enable_omap3630_toggle_l2_on_restore();
 895                 if (omap_rev() < OMAP3630_REV_ES1_2)
 896                         pm34xx_errata |= PM_SDRC_WAKEUP_ERRATUM_i583;
 897         }
 898 }
 899
 900 static int __init omap3_pm_init(void)
 901 {
 902         struct power_state *pwrst, *tmp;
 903         struct clockdomain *neon_clkdm, *per_clkdm, *mpu_clkdm, *core_clkdm;
 904         int ret;
 905
 906         if (!cpu_is_omap34xx())
 907                 return -ENODEV;
 908
 909         pm_errata_configure();
 910
 911         printk(KERN_ERR "Power Management for TI OMAP3.\n");
 912
 913         /* XXX prcm_setup_regs needs to be before enabling hw
 914          * supervised mode for powerdomains */
 915         prcm_setup_regs();
 916
 917         ret = request_irq(INT_34XX_PRCM_MPU_IRQ,
 918                           (irq_handler_t)prcm_interrupt_handler,
 919                           IRQF_DISABLED, "prcm", NULL);
 920         if (ret) {
 921                 printk(KERN_ERR "request_irq failed to register for 0x%x\n",
 922                        INT_34XX_PRCM_MPU_IRQ);
 923                 goto err1;
 924         }
 925
 926         ret = pwrdm_for_each(pwrdms_setup, NULL);
 927         if (ret) {
 928                 printk(KERN_ERR "Failed to setup powerdomains\n");
 929                 goto err2;
 930         }
 931
 932         (void) clkdm_for_each(clkdms_setup, NULL);
 933
 934         mpu_pwrdm = pwrdm_lookup("mpu_pwrdm");
 935         if (mpu_pwrdm == NULL) {
 936                 printk(KERN_ERR "Failed to get mpu_pwrdm\n");
 937                 goto err2;
 938         }
 939
 940         neon_pwrdm = pwrdm_lookup("neon_pwrdm");
 941         per_pwrdm = pwrdm_lookup("per_pwrdm");
 942         core_pwrdm = pwrdm_lookup("core_pwrdm");
 943         cam_pwrdm = pwrdm_lookup("cam_pwrdm");
 944
 945         neon_clkdm = clkdm_lookup("neon_clkdm");
 946         mpu_clkdm = clkdm_lookup("mpu_clkdm");
 947         per_clkdm = clkdm_lookup("per_clkdm");
 948         core_clkdm = clkdm_lookup("core_clkdm");
 949
 950         omap_push_sram_idle();
 951 #ifdef CONFIG_SUSPEND
 952         suspend_set_ops(&omap_pm_ops);
 953 #endif /* CONFIG_SUSPEND */
 954
 955         pm_idle = omap3_pm_idle;
 956         omap3_idle_init();
 957
 958         /*
 959          * RTA is disabled during initialization as per erratum i608
 960          * it is safer to disable RTA by the bootloader, but we would like
 961          * to be doubly sure here and prevent any mishaps.
 962          */
 963         if (IS_PM34XX_ERRATUM(PM_RTA_ERRATUM_i608))
 964                 omap3630_ctrl_disable_rta();
 965
 966         clkdm_add_wkdep(neon_clkdm, mpu_clkdm);
 967         if (omap_type() != OMAP2_DEVICE_TYPE_GP) {
 968                 omap3_secure_ram_storage =
 969                         kmalloc(0x803F, GFP_KERNEL);
 970                 if (!omap3_secure_ram_storage)
 971                         printk(KERN_ERR "Memory allocation failed when"
 972                                         "allocating for secure sram context\n");
 973
 974                 local_irq_disable();
 975                 local_fiq_disable();
 976
 977                 omap_dma_global_context_save();
 978                 omap3_save_secure_ram_context();
 979                 omap_dma_global_context_restore();
 980
 981                 local_irq_enable();
 982                 local_fiq_enable();
 983         }
 984
 985         omap3_save_scratchpad_contents();
 986 err1:
 987         return ret;
 988 err2:
 989         free_irq(INT_34XX_PRCM_MPU_IRQ, NULL);
 990         list_for_each_entry_safe(pwrst, tmp, &pwrst_list, node) {
 991                 list_del(&pwrst->node);
 992                 kfree(pwrst);
 993         }
 994         return ret;
 995 }
 996
 997 late_initcall(omap3_pm_init);