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   1 /*
   2  * linux/arch/arm/mach-omap1/pm.c
   3  *
   4  * OMAP Power Management Routines
   5  *
   6  * Original code for the SA11x0:
   7  * Copyright (c) 2001 Cliff Brake <cbrake@accelent.com>
   8  *
   9  * Modified for the PXA250 by Nicolas Pitre:
  10  * Copyright (c) 2002 Monta Vista Software, Inc.
  11  *
  12  * Modified for the OMAP1510 by David Singleton:
  13  * Copyright (c) 2002 Monta Vista Software, Inc.
  14  *
  15  * Cleanup 2004 for OMAP1510/1610 by Dirk Behme <dirk.behme@de.bosch.com>
  16  *
  17  * This program is free software; you can redistribute it and/or modify it
  18  * under the terms of the GNU General Public License as published by the
  19  * Free Software Foundation; either version 2 of the License, or (at your
  20  * option) any later version.
  21  *
  22  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  23  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  24  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
  25  * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  26  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  27  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
  28  * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
  29  * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  30  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  31  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  32  *
  33  * You should have received a copy of the GNU General Public License along
  34  * with this program; if not, write to the Free Software Foundation, Inc.,
  35  * 675 Mass Ave, Cambridge, MA 02139, USA.
  36  */
  37
  38 #include <linux/suspend.h>
  39 #include <linux/sched.h>
  40 #include <linux/proc_fs.h>
  41 #include <linux/interrupt.h>
  42 #include <linux/sysfs.h>
  43 #include <linux/module.h>
  44
  45 #include <asm/io.h>
  46 #include <asm/irq.h>
  47 #include <asm/atomic.h>
  48 #include <asm/mach/time.h>
  49 #include <asm/mach/irq.h>
  50 #include <asm/mach-types.h>
  51
  52 #include <asm/arch/cpu.h>
  53 #include <asm/arch/irqs.h>
  54 #include <asm/arch/clock.h>
  55 #include <asm/arch/sram.h>
  56 #include <asm/arch/tc.h>
  57 #include <asm/arch/pm.h>
  58 #include <asm/arch/mux.h>
  59 #include <asm/arch/dma.h>
  60 #include <asm/arch/dsp_common.h>
  61 #include <asm/arch/dmtimer.h>
  62
  63 static unsigned int arm_sleep_save[ARM_SLEEP_SAVE_SIZE];
  64 static unsigned short dsp_sleep_save[DSP_SLEEP_SAVE_SIZE];
  65 static unsigned short ulpd_sleep_save[ULPD_SLEEP_SAVE_SIZE];
  66 static unsigned int mpui730_sleep_save[MPUI730_SLEEP_SAVE_SIZE];
  67 static unsigned int mpui1510_sleep_save[MPUI1510_SLEEP_SAVE_SIZE];
  68 static unsigned int mpui1610_sleep_save[MPUI1610_SLEEP_SAVE_SIZE];
  69
  70 static unsigned short enable_dyn_sleep = 1;
  71
  72 static ssize_t omap_pm_sleep_while_idle_show(struct kset *kset, char *buf)
  73 {
  74         return sprintf(buf, "%hu\n", enable_dyn_sleep);
  75 }
  76
  77 static ssize_t omap_pm_sleep_while_idle_store(struct kset *kset,
  78                                               const char * buf,
  79                                               size_t n)
  80 {
  81         unsigned short value;
  82         if (sscanf(buf, "%hu", &value) != 1 ||
  83             (value != 0 && value != 1)) {
  84                 printk(KERN_ERR "idle_sleep_store: Invalid value\n");
  85                 return -EINVAL;
  86         }
  87         enable_dyn_sleep = value;
  88         return n;
  89 }
  90
  91 static struct subsys_attribute sleep_while_idle_attr = {
  92         .attr   = {
  93                 .name = __stringify(sleep_while_idle),
  94                 .mode = 0644,
  95         },
  96         .show   = omap_pm_sleep_while_idle_show,
  97         .store  = omap_pm_sleep_while_idle_store,
  98 };
  99
 100 extern struct kset power_subsys;
 101 static void (*omap_sram_idle)(void) = NULL;
 102 static void (*omap_sram_suspend)(unsigned long r0, unsigned long r1) = NULL;
 103
 104 /*
 105  * Let's power down on idle, but only if we are really
 106  * idle, because once we start down the path of
 107  * going idle we continue to do idle even if we get
 108  * a clock tick interrupt . .
 109  */
 110 void omap_pm_idle(void)
 111 {
 112         extern __u32 arm_idlect1_mask;
 113         __u32 use_idlect1 = arm_idlect1_mask;
 114 #ifndef CONFIG_OMAP_MPU_TIMER
 115         int do_sleep;
 116 #endif
 117
 118         local_irq_disable();
 119         local_fiq_disable();
 120         if (need_resched()) {
 121                 local_fiq_enable();
 122                 local_irq_enable();
 123                 return;
 124         }
 125
 126         /*
 127          * Since an interrupt may set up a timer, we don't want to
 128          * reprogram the hardware timer with interrupts enabled.
 129          * Re-enable interrupts only after returning from idle.
 130          */
 131         timer_dyn_reprogram();
 132
 133 #ifdef CONFIG_OMAP_MPU_TIMER
 134 #warning Enable 32kHz OS timer in order to allow sleep states in idle
 135         use_idlect1 = use_idlect1 & ~(1 << 9);
 136 #else
 137
 138         do_sleep = 0;
 139         while (enable_dyn_sleep) {
 140
 141 #ifdef CONFIG_CBUS_TAHVO_USB
 142                 extern int vbus_active;
 143                 /* Clock requirements? */
 144                 if (vbus_active)
 145                         break;
 146 #endif
 147                 do_sleep = 1;
 148                 break;
 149         }
 150
 151 #ifdef CONFIG_OMAP_DM_TIMER
 152         use_idlect1 = omap_dm_timer_modify_idlect_mask(use_idlect1);
 153 #endif
 154
 155         if (omap_dma_running())
 156                 use_idlect1 &= ~(1 << 6);
 157
 158         /* We should be able to remove the do_sleep variable and multiple
 159          * tests above as soon as drivers, timer and DMA code have been fixed.
 160          * Even the sleep block count should become obsolete. */
 161         if ((use_idlect1 != ~0) || !do_sleep) {
 162
 163                 __u32 saved_idlect1 = omap_readl(ARM_IDLECT1);
 164                 if (cpu_is_omap15xx())
 165                         use_idlect1 &= OMAP1510_BIG_SLEEP_REQUEST;
 166                 else
 167                         use_idlect1 &= OMAP1610_IDLECT1_SLEEP_VAL;
 168                 omap_writel(use_idlect1, ARM_IDLECT1);
 169                 __asm__ volatile ("mcr  p15, 0, r0, c7, c0, 4");
 170                 omap_writel(saved_idlect1, ARM_IDLECT1);
 171
 172                 local_fiq_enable();
 173                 local_irq_enable();
 174                 return;
 175         }
 176         omap_sram_suspend(omap_readl(ARM_IDLECT1),
 177                           omap_readl(ARM_IDLECT2));
 178 #endif
 179
 180         local_fiq_enable();
 181         local_irq_enable();
 182 }
 183
 184 /*
 185  * Configuration of the wakeup event is board specific. For the
 186  * moment we put it into this helper function. Later it may move
 187  * to board specific files.
 188  */
 189 static void omap_pm_wakeup_setup(void)
 190 {
 191         u32 level1_wake = 0;
 192         u32 level2_wake = OMAP_IRQ_BIT(INT_UART2);
 193
 194         /*
 195          * Turn off all interrupts except GPIO bank 1, L1-2nd level cascade,
 196          * and the L2 wakeup interrupts: keypad and UART2. Note that the
 197          * drivers must still separately call omap_set_gpio_wakeup() to
 198          * wake up to a GPIO interrupt.
 199          */
 200         if (cpu_is_omap730())
 201                 level1_wake = OMAP_IRQ_BIT(INT_730_GPIO_BANK1) |
 202                         OMAP_IRQ_BIT(INT_730_IH2_IRQ);
 203         else if (cpu_is_omap15xx())
 204                 level1_wake = OMAP_IRQ_BIT(INT_GPIO_BANK1) |
 205                         OMAP_IRQ_BIT(INT_1510_IH2_IRQ);
 206         else if (cpu_is_omap16xx())
 207                 level1_wake = OMAP_IRQ_BIT(INT_GPIO_BANK1) |
 208                         OMAP_IRQ_BIT(INT_1610_IH2_IRQ);
 209
 210         omap_writel(~level1_wake, OMAP_IH1_MIR);
 211
 212         if (cpu_is_omap730()) {
 213                 omap_writel(~level2_wake, OMAP_IH2_0_MIR);
 214                 omap_writel(~(OMAP_IRQ_BIT(INT_730_WAKE_UP_REQ) |
 215                                 OMAP_IRQ_BIT(INT_730_MPUIO_KEYPAD)),
 216                                 OMAP_IH2_1_MIR);
 217         } else if (cpu_is_omap15xx()) {
 218                 level2_wake |= OMAP_IRQ_BIT(INT_KEYBOARD);
 219                 omap_writel(~level2_wake,  OMAP_IH2_MIR);
 220         } else if (cpu_is_omap16xx()) {
 221                 level2_wake |= OMAP_IRQ_BIT(INT_KEYBOARD);
 222                 omap_writel(~level2_wake, OMAP_IH2_0_MIR);
 223
 224                 /* INT_1610_WAKE_UP_REQ is needed for GPIO wakeup... */
 225                 omap_writel(~OMAP_IRQ_BIT(INT_1610_WAKE_UP_REQ),
 226                             OMAP_IH2_1_MIR);
 227                 omap_writel(~0x0, OMAP_IH2_2_MIR);
 228                 omap_writel(~0x0, OMAP_IH2_3_MIR);
 229         }
 230
 231         /*  New IRQ agreement, recalculate in cascade order */
 232         omap_writel(1, OMAP_IH2_CONTROL);
 233         omap_writel(1, OMAP_IH1_CONTROL);
 234 }
 235
 236 #define EN_DSPCK        13      /* ARM_CKCTL */
 237 #define EN_APICK        6       /* ARM_IDLECT2 */
 238 #define DSP_EN          1       /* ARM_RSTCT1 */
 239
 240 void omap_pm_suspend(void)
 241 {
 242         unsigned long arg0 = 0, arg1 = 0;
 243
 244         printk("PM: OMAP%x is trying to enter deep sleep...\n", system_rev);
 245
 246         omap_serial_wake_trigger(1);
 247
 248         if (!cpu_is_omap15xx())
 249                 omap_writew(0xffff, ULPD_SOFT_DISABLE_REQ_REG);
 250
 251         /*
 252          * Step 1: turn off interrupts (FIXME: NOTE: already disabled)
 253          */
 254
 255         local_irq_disable();
 256         local_fiq_disable();
 257
 258         /*
 259          * Step 2: save registers
 260          *
 261          * The omap is a strange/beautiful device. The caches, memory
 262          * and register state are preserved across power saves.
 263          * We have to save and restore very little register state to
 264          * idle the omap.
 265          *
 266          * Save interrupt, MPUI, ARM and UPLD control registers.
 267          */
 268
 269         if (cpu_is_omap730()) {
 270                 MPUI730_SAVE(OMAP_IH1_MIR);
 271                 MPUI730_SAVE(OMAP_IH2_0_MIR);
 272                 MPUI730_SAVE(OMAP_IH2_1_MIR);
 273                 MPUI730_SAVE(MPUI_CTRL);
 274                 MPUI730_SAVE(MPUI_DSP_BOOT_CONFIG);
 275                 MPUI730_SAVE(MPUI_DSP_API_CONFIG);
 276                 MPUI730_SAVE(EMIFS_CONFIG);
 277                 MPUI730_SAVE(EMIFF_SDRAM_CONFIG);
 278
 279         } else if (cpu_is_omap15xx()) {
 280                 MPUI1510_SAVE(OMAP_IH1_MIR);
 281                 MPUI1510_SAVE(OMAP_IH2_MIR);
 282                 MPUI1510_SAVE(MPUI_CTRL);
 283                 MPUI1510_SAVE(MPUI_DSP_BOOT_CONFIG);
 284                 MPUI1510_SAVE(MPUI_DSP_API_CONFIG);
 285                 MPUI1510_SAVE(EMIFS_CONFIG);
 286                 MPUI1510_SAVE(EMIFF_SDRAM_CONFIG);
 287         } else if (cpu_is_omap16xx()) {
 288                 MPUI1610_SAVE(OMAP_IH1_MIR);
 289                 MPUI1610_SAVE(OMAP_IH2_0_MIR);
 290                 MPUI1610_SAVE(OMAP_IH2_1_MIR);
 291                 MPUI1610_SAVE(OMAP_IH2_2_MIR);
 292                 MPUI1610_SAVE(OMAP_IH2_3_MIR);
 293                 MPUI1610_SAVE(MPUI_CTRL);
 294                 MPUI1610_SAVE(MPUI_DSP_BOOT_CONFIG);
 295                 MPUI1610_SAVE(MPUI_DSP_API_CONFIG);
 296                 MPUI1610_SAVE(EMIFS_CONFIG);
 297                 MPUI1610_SAVE(EMIFF_SDRAM_CONFIG);
 298         }
 299
 300         ARM_SAVE(ARM_CKCTL);
 301         ARM_SAVE(ARM_IDLECT1);
 302         ARM_SAVE(ARM_IDLECT2);
 303         if (!(cpu_is_omap15xx()))
 304                 ARM_SAVE(ARM_IDLECT3);
 305         ARM_SAVE(ARM_EWUPCT);
 306         ARM_SAVE(ARM_RSTCT1);
 307         ARM_SAVE(ARM_RSTCT2);
 308         ARM_SAVE(ARM_SYSST);
 309         ULPD_SAVE(ULPD_CLOCK_CTRL);
 310         ULPD_SAVE(ULPD_STATUS_REQ);
 311
 312         /* (Step 3 removed - we now allow deep sleep by default) */
 313
 314         /*
 315          * Step 4: OMAP DSP Shutdown
 316          */
 317
 318         /* stop DSP */
 319         omap_writew(omap_readw(ARM_RSTCT1) & ~(1 << DSP_EN), ARM_RSTCT1);
 320
 321                 /* shut down dsp_ck */
 322         if (!cpu_is_omap730())
 323                 omap_writew(omap_readw(ARM_CKCTL) & ~(1 << EN_DSPCK), ARM_CKCTL);
 324
 325         /* temporarily enabling api_ck to access DSP registers */
 326         omap_writew(omap_readw(ARM_IDLECT2) | 1 << EN_APICK, ARM_IDLECT2);
 327
 328         /* save DSP registers */
 329         DSP_SAVE(DSP_IDLECT2);
 330
 331         /* Stop all DSP domain clocks */
 332         __raw_writew(0, DSP_IDLECT2);
 333
 334         /*
 335          * Step 5: Wakeup Event Setup
 336          */
 337
 338         omap_pm_wakeup_setup();
 339
 340         /*
 341          * Step 6: ARM and Traffic controller shutdown
 342          */
 343
 344         /* disable ARM watchdog */
 345         omap_writel(0x00F5, OMAP_WDT_TIMER_MODE);
 346         omap_writel(0x00A0, OMAP_WDT_TIMER_MODE);
 347
 348         /*
 349          * Step 6b: ARM and Traffic controller shutdown
 350          *
 351          * Step 6 continues here. Prepare jump to power management
 352          * assembly code in internal SRAM.
 353          *
 354          * Since the omap_cpu_suspend routine has been copied to
 355          * SRAM, we'll do an indirect procedure call to it and pass the
 356          * contents of arm_idlect1 and arm_idlect2 so it can restore
 357          * them when it wakes up and it will return.
 358          */
 359
 360         arg0 = arm_sleep_save[ARM_SLEEP_SAVE_ARM_IDLECT1];
 361         arg1 = arm_sleep_save[ARM_SLEEP_SAVE_ARM_IDLECT2];
 362
 363         /*
 364          * Step 6c: ARM and Traffic controller shutdown
 365          *
 366          * Jump to assembly code. The processor will stay there
 367          * until wake up.
 368          */
 369         omap_sram_suspend(arg0, arg1);
 370
 371         /*
 372          * If we are here, processor is woken up!
 373          */
 374
 375         /*
 376          * Restore DSP clocks
 377          */
 378
 379         /* again temporarily enabling api_ck to access DSP registers */
 380         omap_writew(omap_readw(ARM_IDLECT2) | 1 << EN_APICK, ARM_IDLECT2);
 381
 382         /* Restore DSP domain clocks */
 383         DSP_RESTORE(DSP_IDLECT2);
 384
 385         /*
 386          * Restore ARM state, except ARM_IDLECT1/2 which omap_cpu_suspend did
 387          */
 388
 389         if (!(cpu_is_omap15xx()))
 390                 ARM_RESTORE(ARM_IDLECT3);
 391         ARM_RESTORE(ARM_CKCTL);
 392         ARM_RESTORE(ARM_EWUPCT);
 393         ARM_RESTORE(ARM_RSTCT1);
 394         ARM_RESTORE(ARM_RSTCT2);
 395         ARM_RESTORE(ARM_SYSST);
 396         ULPD_RESTORE(ULPD_CLOCK_CTRL);
 397         ULPD_RESTORE(ULPD_STATUS_REQ);
 398
 399         if (cpu_is_omap730()) {
 400                 MPUI730_RESTORE(EMIFS_CONFIG);
 401                 MPUI730_RESTORE(EMIFF_SDRAM_CONFIG);
 402                 MPUI730_RESTORE(OMAP_IH1_MIR);
 403                 MPUI730_RESTORE(OMAP_IH2_0_MIR);
 404                 MPUI730_RESTORE(OMAP_IH2_1_MIR);
 405         } else if (cpu_is_omap15xx()) {
 406                 MPUI1510_RESTORE(MPUI_CTRL);
 407                 MPUI1510_RESTORE(MPUI_DSP_BOOT_CONFIG);
 408                 MPUI1510_RESTORE(MPUI_DSP_API_CONFIG);
 409                 MPUI1510_RESTORE(EMIFS_CONFIG);
 410                 MPUI1510_RESTORE(EMIFF_SDRAM_CONFIG);
 411                 MPUI1510_RESTORE(OMAP_IH1_MIR);
 412                 MPUI1510_RESTORE(OMAP_IH2_MIR);
 413         } else if (cpu_is_omap16xx()) {
 414                 MPUI1610_RESTORE(MPUI_CTRL);
 415                 MPUI1610_RESTORE(MPUI_DSP_BOOT_CONFIG);
 416                 MPUI1610_RESTORE(MPUI_DSP_API_CONFIG);
 417                 MPUI1610_RESTORE(EMIFS_CONFIG);
 418                 MPUI1610_RESTORE(EMIFF_SDRAM_CONFIG);
 419
 420                 MPUI1610_RESTORE(OMAP_IH1_MIR);
 421                 MPUI1610_RESTORE(OMAP_IH2_0_MIR);
 422                 MPUI1610_RESTORE(OMAP_IH2_1_MIR);
 423                 MPUI1610_RESTORE(OMAP_IH2_2_MIR);
 424                 MPUI1610_RESTORE(OMAP_IH2_3_MIR);
 425         }
 426
 427         if (!cpu_is_omap15xx())
 428                 omap_writew(0, ULPD_SOFT_DISABLE_REQ_REG);
 429
 430         /*
 431          * Re-enable interrupts
 432          */
 433
 434         local_irq_enable();
 435         local_fiq_enable();
 436
 437         omap_serial_wake_trigger(0);
 438
 439         printk("PM: OMAP%x is re-starting from deep sleep...\n", system_rev);
 440 }
 441
 442 #if defined(DEBUG) && defined(CONFIG_PROC_FS)
 443 static int g_read_completed;
 444
 445 /*
 446  * Read system PM registers for debugging
 447  */
 448 static int omap_pm_read_proc(
 449         char *page_buffer,
 450         char **my_first_byte,
 451         off_t virtual_start,
 452         int length,
 453         int *eof,
 454         void *data)
 455 {
 456         int my_buffer_offset = 0;
 457         char * const my_base = page_buffer;
 458
 459         ARM_SAVE(ARM_CKCTL);
 460         ARM_SAVE(ARM_IDLECT1);
 461         ARM_SAVE(ARM_IDLECT2);
 462         if (!(cpu_is_omap15xx()))
 463                 ARM_SAVE(ARM_IDLECT3);
 464         ARM_SAVE(ARM_EWUPCT);
 465         ARM_SAVE(ARM_RSTCT1);
 466         ARM_SAVE(ARM_RSTCT2);
 467         ARM_SAVE(ARM_SYSST);
 468
 469         ULPD_SAVE(ULPD_IT_STATUS);
 470         ULPD_SAVE(ULPD_CLOCK_CTRL);
 471         ULPD_SAVE(ULPD_SOFT_REQ);
 472         ULPD_SAVE(ULPD_STATUS_REQ);
 473         ULPD_SAVE(ULPD_DPLL_CTRL);
 474         ULPD_SAVE(ULPD_POWER_CTRL);
 475
 476         if (cpu_is_omap730()) {
 477                 MPUI730_SAVE(MPUI_CTRL);
 478                 MPUI730_SAVE(MPUI_DSP_STATUS);
 479                 MPUI730_SAVE(MPUI_DSP_BOOT_CONFIG);
 480                 MPUI730_SAVE(MPUI_DSP_API_CONFIG);
 481                 MPUI730_SAVE(EMIFF_SDRAM_CONFIG);
 482                 MPUI730_SAVE(EMIFS_CONFIG);
 483         } else if (cpu_is_omap15xx()) {
 484                 MPUI1510_SAVE(MPUI_CTRL);
 485                 MPUI1510_SAVE(MPUI_DSP_STATUS);
 486                 MPUI1510_SAVE(MPUI_DSP_BOOT_CONFIG);
 487                 MPUI1510_SAVE(MPUI_DSP_API_CONFIG);
 488                 MPUI1510_SAVE(EMIFF_SDRAM_CONFIG);
 489                 MPUI1510_SAVE(EMIFS_CONFIG);
 490         } else if (cpu_is_omap16xx()) {
 491                 MPUI1610_SAVE(MPUI_CTRL);
 492                 MPUI1610_SAVE(MPUI_DSP_STATUS);
 493                 MPUI1610_SAVE(MPUI_DSP_BOOT_CONFIG);
 494                 MPUI1610_SAVE(MPUI_DSP_API_CONFIG);
 495                 MPUI1610_SAVE(EMIFF_SDRAM_CONFIG);
 496                 MPUI1610_SAVE(EMIFS_CONFIG);
 497         }
 498
 499         if (virtual_start == 0) {
 500                 g_read_completed = 0;
 501
 502                 my_buffer_offset += sprintf(my_base + my_buffer_offset,
 503                    "ARM_CKCTL_REG:            0x%-8x     \n"
 504                    "ARM_IDLECT1_REG:          0x%-8x     \n"
 505                    "ARM_IDLECT2_REG:          0x%-8x     \n"
 506                    "ARM_IDLECT3_REG:          0x%-8x     \n"
 507                    "ARM_EWUPCT_REG:           0x%-8x     \n"
 508                    "ARM_RSTCT1_REG:           0x%-8x     \n"
 509                    "ARM_RSTCT2_REG:           0x%-8x     \n"
 510                    "ARM_SYSST_REG:            0x%-8x     \n"
 511                    "ULPD_IT_STATUS_REG:       0x%-4x     \n"
 512                    "ULPD_CLOCK_CTRL_REG:      0x%-4x     \n"
 513                    "ULPD_SOFT_REQ_REG:        0x%-4x     \n"
 514                    "ULPD_DPLL_CTRL_REG:       0x%-4x     \n"
 515                    "ULPD_STATUS_REQ_REG:      0x%-4x     \n"
 516                    "ULPD_POWER_CTRL_REG:      0x%-4x     \n",
 517                    ARM_SHOW(ARM_CKCTL),
 518                    ARM_SHOW(ARM_IDLECT1),
 519                    ARM_SHOW(ARM_IDLECT2),
 520                    ARM_SHOW(ARM_IDLECT3),
 521                    ARM_SHOW(ARM_EWUPCT),
 522                    ARM_SHOW(ARM_RSTCT1),
 523                    ARM_SHOW(ARM_RSTCT2),
 524                    ARM_SHOW(ARM_SYSST),
 525                    ULPD_SHOW(ULPD_IT_STATUS),
 526                    ULPD_SHOW(ULPD_CLOCK_CTRL),
 527                    ULPD_SHOW(ULPD_SOFT_REQ),
 528                    ULPD_SHOW(ULPD_DPLL_CTRL),
 529                    ULPD_SHOW(ULPD_STATUS_REQ),
 530                    ULPD_SHOW(ULPD_POWER_CTRL));
 531
 532                 if (cpu_is_omap730()) {
 533                         my_buffer_offset += sprintf(my_base + my_buffer_offset,
 534                            "MPUI730_CTRL_REG         0x%-8x \n"
 535                            "MPUI730_DSP_STATUS_REG:      0x%-8x \n"
 536                            "MPUI730_DSP_BOOT_CONFIG_REG: 0x%-8x \n"
 537                            "MPUI730_DSP_API_CONFIG_REG:  0x%-8x \n"
 538                            "MPUI730_SDRAM_CONFIG_REG:    0x%-8x \n"
 539                            "MPUI730_EMIFS_CONFIG_REG:    0x%-8x \n",
 540                            MPUI730_SHOW(MPUI_CTRL),
 541                            MPUI730_SHOW(MPUI_DSP_STATUS),
 542                            MPUI730_SHOW(MPUI_DSP_BOOT_CONFIG),
 543                            MPUI730_SHOW(MPUI_DSP_API_CONFIG),
 544                            MPUI730_SHOW(EMIFF_SDRAM_CONFIG),
 545                            MPUI730_SHOW(EMIFS_CONFIG));
 546                 } else if (cpu_is_omap15xx()) {
 547                         my_buffer_offset += sprintf(my_base + my_buffer_offset,
 548                            "MPUI1510_CTRL_REG             0x%-8x \n"
 549                            "MPUI1510_DSP_STATUS_REG:      0x%-8x \n"
 550                            "MPUI1510_DSP_BOOT_CONFIG_REG: 0x%-8x \n"
 551                            "MPUI1510_DSP_API_CONFIG_REG:  0x%-8x \n"
 552                            "MPUI1510_SDRAM_CONFIG_REG:    0x%-8x \n"
 553                            "MPUI1510_EMIFS_CONFIG_REG:    0x%-8x \n",
 554                            MPUI1510_SHOW(MPUI_CTRL),
 555                            MPUI1510_SHOW(MPUI_DSP_STATUS),
 556                            MPUI1510_SHOW(MPUI_DSP_BOOT_CONFIG),
 557                            MPUI1510_SHOW(MPUI_DSP_API_CONFIG),
 558                            MPUI1510_SHOW(EMIFF_SDRAM_CONFIG),
 559                            MPUI1510_SHOW(EMIFS_CONFIG));
 560                 } else if (cpu_is_omap16xx()) {
 561                         my_buffer_offset += sprintf(my_base + my_buffer_offset,
 562                            "MPUI1610_CTRL_REG             0x%-8x \n"
 563                            "MPUI1610_DSP_STATUS_REG:      0x%-8x \n"
 564                            "MPUI1610_DSP_BOOT_CONFIG_REG: 0x%-8x \n"
 565                            "MPUI1610_DSP_API_CONFIG_REG:  0x%-8x \n"
 566                            "MPUI1610_SDRAM_CONFIG_REG:    0x%-8x \n"
 567                            "MPUI1610_EMIFS_CONFIG_REG:    0x%-8x \n",
 568                            MPUI1610_SHOW(MPUI_CTRL),
 569                            MPUI1610_SHOW(MPUI_DSP_STATUS),
 570                            MPUI1610_SHOW(MPUI_DSP_BOOT_CONFIG),
 571                            MPUI1610_SHOW(MPUI_DSP_API_CONFIG),
 572                            MPUI1610_SHOW(EMIFF_SDRAM_CONFIG),
 573                            MPUI1610_SHOW(EMIFS_CONFIG));
 574                 }
 575
 576                 g_read_completed++;
 577         } else if (g_read_completed >= 1) {
 578                  *eof = 1;
 579                  return 0;
 580         }
 581         g_read_completed++;
 582
 583         *my_first_byte = page_buffer;
 584         return  my_buffer_offset;
 585 }
 586
 587 static void omap_pm_init_proc(void)
 588 {
 589         struct proc_dir_entry *entry;
 590
 591         entry = create_proc_read_entry("driver/omap_pm",
 592                                        S_IWUSR | S_IRUGO, NULL,
 593                                        omap_pm_read_proc, NULL);
 594 }
 595
 596 #endif /* DEBUG && CONFIG_PROC_FS */
 597
 598 static void (*saved_idle)(void) = NULL;
 599
 600 /*
 601  *      omap_pm_prepare - Do preliminary suspend work.
 602  *
 603  */
 604 static int omap_pm_prepare(void)
 605 {
 606         /* We cannot sleep in idle until we have resumed */
 607         saved_idle = pm_idle;
 608         pm_idle = NULL;
 609
 610         return 0;
 611 }
 612
 613
 614 /*
 615  *      omap_pm_enter - Actually enter a sleep state.
 616  *      @state:         State we're entering.
 617  *
 618  */
 619
 620 static int omap_pm_enter(suspend_state_t state)
 621 {
 622         switch (state)
 623         {
 624         case PM_SUSPEND_STANDBY:
 625         case PM_SUSPEND_MEM:
 626                 omap_pm_suspend();
 627                 break;
 628         default:
 629                 return -EINVAL;
 630         }
 631
 632         return 0;
 633 }
 634
 635
 636 /**
 637  *      omap_pm_finish - Finish up suspend sequence.
 638  *
 639  *      This is called after we wake back up (or if entering the sleep state
 640  *      failed).
 641  */
 642
 643 static void omap_pm_finish(void)
 644 {
 645         pm_idle = saved_idle;
 646 }
 647
 648
 649 static irqreturn_t  omap_wakeup_interrupt(int irq, void *dev)
 650 {
 651         return IRQ_HANDLED;
 652 }
 653
 654 static struct irqaction omap_wakeup_irq = {
 655         .name           = "peripheral wakeup",
 656         .flags          = IRQF_DISABLED,
 657         .handler        = omap_wakeup_interrupt
 658 };
 659
 660
 661
 662 static struct platform_suspend_ops omap_pm_ops ={
 663         .prepare        = omap_pm_prepare,
 664         .enter          = omap_pm_enter,
 665         .finish         = omap_pm_finish,
 666         .valid          = suspend_valid_only_mem,
 667 };
 668
 669 static int __init omap_pm_init(void)
 670 {
 671         int error;
 672
 673         printk("Power Management for TI OMAP.\n");
 674
 675         /*
 676          * We copy the assembler sleep/wakeup routines to SRAM.
 677          * These routines need to be in SRAM as that's the only
 678          * memory the MPU can see when it wakes up.
 679          */
 680         if (cpu_is_omap730()) {
 681                 omap_sram_idle = omap_sram_push(omap730_idle_loop_suspend,
 682                                                 omap730_idle_loop_suspend_sz);
 683                 omap_sram_suspend = omap_sram_push(omap730_cpu_suspend,
 684                                                    omap730_cpu_suspend_sz);
 685         } else if (cpu_is_omap15xx()) {
 686                 omap_sram_idle = omap_sram_push(omap1510_idle_loop_suspend,
 687                                                 omap1510_idle_loop_suspend_sz);
 688                 omap_sram_suspend = omap_sram_push(omap1510_cpu_suspend,
 689                                                    omap1510_cpu_suspend_sz);
 690         } else if (cpu_is_omap16xx()) {
 691                 omap_sram_idle = omap_sram_push(omap1610_idle_loop_suspend,
 692                                                 omap1610_idle_loop_suspend_sz);
 693                 omap_sram_suspend = omap_sram_push(omap1610_cpu_suspend,
 694                                                    omap1610_cpu_suspend_sz);
 695         }
 696
 697         if (omap_sram_idle == NULL || omap_sram_suspend == NULL) {
 698                 printk(KERN_ERR "PM not initialized: Missing SRAM support\n");
 699                 return -ENODEV;
 700         }
 701
 702         pm_idle = omap_pm_idle;
 703
 704         if (cpu_is_omap730())
 705                 setup_irq(INT_730_WAKE_UP_REQ, &omap_wakeup_irq);
 706         else if (cpu_is_omap16xx())
 707                 setup_irq(INT_1610_WAKE_UP_REQ, &omap_wakeup_irq);
 708
 709         /* Program new power ramp-up time
 710          * (0 for most boards since we don't lower voltage when in deep sleep)
 711          */
 712         omap_writew(ULPD_SETUP_ANALOG_CELL_3_VAL, ULPD_SETUP_ANALOG_CELL_3);
 713
 714         /* Setup ULPD POWER_CTRL_REG - enter deep sleep whenever possible */
 715         omap_writew(ULPD_POWER_CTRL_REG_VAL, ULPD_POWER_CTRL);
 716
 717         /* Configure IDLECT3 */
 718         if (cpu_is_omap730())
 719                 omap_writel(OMAP730_IDLECT3_VAL, OMAP730_IDLECT3);
 720         else if (cpu_is_omap16xx())
 721                 omap_writel(OMAP1610_IDLECT3_VAL, OMAP1610_IDLECT3);
 722
 723         suspend_set_ops(&omap_pm_ops);
 724
 725 #if defined(DEBUG) && defined(CONFIG_PROC_FS)
 726         omap_pm_init_proc();
 727 #endif
 728
 729         error = subsys_create_file(&power_subsys, &sleep_while_idle_attr);
 730         if (error)
 731                 printk(KERN_ERR "subsys_create_file failed: %d\n", error);
 732
 733         if (cpu_is_omap16xx()) {
 734                 /* configure LOW_PWR pin */
 735                 omap_cfg_reg(T20_1610_LOW_PWR);
 736         }
 737
 738         return 0;
 739 }
 740 __initcall(omap_pm_init);