arch/arm/mach-omap1/pm.c

   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 #ifdef CONFIG_OMAP_32K_TIMER
  71
  72 static unsigned short enable_dyn_sleep = 1;
  73
  74 static ssize_t idle_show(struct kobject *kobj, struct kobj_attribute *attr,
  75                          char *buf)
  76 {
  77         return sprintf(buf, "%hu\n", enable_dyn_sleep);
  78 }
  79
  80 static ssize_t idle_store(struct kobject *kobj, struct kobj_attribute *attr,
  81                           const char * buf, size_t n)
  82 {
  83         unsigned short value;
  84         if (sscanf(buf, "%hu", &value) != 1 ||
  85             (value != 0 && value != 1)) {
  86                 printk(KERN_ERR "idle_sleep_store: Invalid value\n");
  87                 return -EINVAL;
  88         }
  89         enable_dyn_sleep = value;
  90         return n;
  91 }
  92
  93 static struct kobj_attribute sleep_while_idle_attr =
  94         __ATTR(sleep_while_idle, 0644, idle_show, idle_store);
  95
  96 #endif
  97
  98 static void (*omap_sram_idle)(void) = NULL;
  99 static void (*omap_sram_suspend)(unsigned long r0, unsigned long r1) = NULL;
 100
 101 /*
 102  * Let's power down on idle, but only if we are really
 103  * idle, because once we start down the path of
 104  * going idle we continue to do idle even if we get
 105  * a clock tick interrupt . .
 106  */
 107 void omap_pm_idle(void)
 108 {
 109         extern __u32 arm_idlect1_mask;
 110         __u32 use_idlect1 = arm_idlect1_mask;
 111         int do_sleep = 0;
 112
 113         local_irq_disable();
 114         local_fiq_disable();
 115         if (need_resched()) {
 116                 local_fiq_enable();
 117                 local_irq_enable();
 118                 return;
 119         }
 120
 121         /*
 122          * Since an interrupt may set up a timer, we don't want to
 123          * reprogram the hardware timer with interrupts enabled.
 124          * Re-enable interrupts only after returning from idle.
 125          */
 126         timer_dyn_reprogram();
 127
 128 #ifdef CONFIG_OMAP_MPU_TIMER
 129 #warning Enable 32kHz OS timer in order to allow sleep states in idle
 130         use_idlect1 = use_idlect1 & ~(1 << 9);
 131 #else
 132
 133         while (enable_dyn_sleep) {
 134
 135 #ifdef CONFIG_CBUS_TAHVO_USB
 136                 extern int vbus_active;
 137                 /* Clock requirements? */
 138                 if (vbus_active)
 139                         break;
 140 #endif
 141                 do_sleep = 1;
 142                 break;
 143         }
 144
 145 #endif
 146
 147 #ifdef CONFIG_OMAP_DM_TIMER
 148         use_idlect1 = omap_dm_timer_modify_idlect_mask(use_idlect1);
 149 #endif
 150
 151         if (omap_dma_running())
 152                 use_idlect1 &= ~(1 << 6);
 153
 154         /* We should be able to remove the do_sleep variable and multiple
 155          * tests above as soon as drivers, timer and DMA code have been fixed.
 156          * Even the sleep block count should become obsolete. */
 157         if ((use_idlect1 != ~0) || !do_sleep) {
 158
 159                 __u32 saved_idlect1 = omap_readl(ARM_IDLECT1);
 160                 if (cpu_is_omap15xx())
 161                         use_idlect1 &= OMAP1510_BIG_SLEEP_REQUEST;
 162                 else
 163                         use_idlect1 &= OMAP1610_IDLECT1_SLEEP_VAL;
 164                 omap_writel(use_idlect1, ARM_IDLECT1);
 165                 __asm__ volatile ("mcr  p15, 0, r0, c7, c0, 4");
 166                 omap_writel(saved_idlect1, ARM_IDLECT1);
 167
 168                 local_fiq_enable();
 169                 local_irq_enable();
 170                 return;
 171         }
 172         omap_sram_suspend(omap_readl(ARM_IDLECT1),
 173                           omap_readl(ARM_IDLECT2));
 174
 175         local_fiq_enable();
 176         local_irq_enable();
 177 }
 178
 179 /*
 180  * Configuration of the wakeup event is board specific. For the
 181  * moment we put it into this helper function. Later it may move
 182  * to board specific files.
 183  */
 184 static void omap_pm_wakeup_setup(void)
 185 {
 186         u32 level1_wake = 0;
 187         u32 level2_wake = OMAP_IRQ_BIT(INT_UART2);
 188
 189         /*
 190          * Turn off all interrupts except GPIO bank 1, L1-2nd level cascade,
 191          * and the L2 wakeup interrupts: keypad and UART2. Note that the
 192          * drivers must still separately call omap_set_gpio_wakeup() to
 193          * wake up to a GPIO interrupt.
 194          */
 195         if (cpu_is_omap730())
 196                 level1_wake = OMAP_IRQ_BIT(INT_730_GPIO_BANK1) |
 197                         OMAP_IRQ_BIT(INT_730_IH2_IRQ);
 198         else if (cpu_is_omap15xx())
 199                 level1_wake = OMAP_IRQ_BIT(INT_GPIO_BANK1) |
 200                         OMAP_IRQ_BIT(INT_1510_IH2_IRQ);
 201         else if (cpu_is_omap16xx())
 202                 level1_wake = OMAP_IRQ_BIT(INT_GPIO_BANK1) |
 203                         OMAP_IRQ_BIT(INT_1610_IH2_IRQ);
 204
 205         omap_writel(~level1_wake, OMAP_IH1_MIR);
 206
 207         if (cpu_is_omap730()) {
 208                 omap_writel(~level2_wake, OMAP_IH2_0_MIR);
 209                 omap_writel(~(OMAP_IRQ_BIT(INT_730_WAKE_UP_REQ) |
 210                                 OMAP_IRQ_BIT(INT_730_MPUIO_KEYPAD)),
 211                                 OMAP_IH2_1_MIR);
 212         } else if (cpu_is_omap15xx()) {
 213                 level2_wake |= OMAP_IRQ_BIT(INT_KEYBOARD);
 214                 omap_writel(~level2_wake,  OMAP_IH2_MIR);
 215         } else if (cpu_is_omap16xx()) {
 216                 level2_wake |= OMAP_IRQ_BIT(INT_KEYBOARD);
 217                 omap_writel(~level2_wake, OMAP_IH2_0_MIR);
 218
 219                 /* INT_1610_WAKE_UP_REQ is needed for GPIO wakeup... */
 220                 omap_writel(~OMAP_IRQ_BIT(INT_1610_WAKE_UP_REQ),
 221                             OMAP_IH2_1_MIR);
 222                 omap_writel(~0x0, OMAP_IH2_2_MIR);
 223                 omap_writel(~0x0, OMAP_IH2_3_MIR);
 224         }
 225
 226         /*  New IRQ agreement, recalculate in cascade order */
 227         omap_writel(1, OMAP_IH2_CONTROL);
 228         omap_writel(1, OMAP_IH1_CONTROL);
 229 }
 230
 231 #define EN_DSPCK        13      /* ARM_CKCTL */
 232 #define EN_APICK        6       /* ARM_IDLECT2 */
 233 #define DSP_EN          1       /* ARM_RSTCT1 */
 234
 235 void omap_pm_suspend(void)
 236 {
 237         unsigned long arg0 = 0, arg1 = 0;
 238
 239         printk("PM: OMAP%x is trying to enter deep sleep...\n", system_rev);
 240
 241         omap_serial_wake_trigger(1);
 242
 243         if (!cpu_is_omap15xx())
 244                 omap_writew(0xffff, ULPD_SOFT_DISABLE_REQ_REG);
 245
 246         /*
 247          * Step 1: turn off interrupts (FIXME: NOTE: already disabled)
 248          */
 249
 250         local_irq_disable();
 251         local_fiq_disable();
 252
 253         /*
 254          * Step 2: save registers
 255          *
 256          * The omap is a strange/beautiful device. The caches, memory
 257          * and register state are preserved across power saves.
 258          * We have to save and restore very little register state to
 259          * idle the omap.
 260          *
 261          * Save interrupt, MPUI, ARM and UPLD control registers.
 262          */
 263
 264         if (cpu_is_omap730()) {
 265                 MPUI730_SAVE(OMAP_IH1_MIR);
 266                 MPUI730_SAVE(OMAP_IH2_0_MIR);
 267                 MPUI730_SAVE(OMAP_IH2_1_MIR);
 268                 MPUI730_SAVE(MPUI_CTRL);
 269                 MPUI730_SAVE(MPUI_DSP_BOOT_CONFIG);
 270                 MPUI730_SAVE(MPUI_DSP_API_CONFIG);
 271                 MPUI730_SAVE(EMIFS_CONFIG);
 272                 MPUI730_SAVE(EMIFF_SDRAM_CONFIG);
 273
 274         } else if (cpu_is_omap15xx()) {
 275                 MPUI1510_SAVE(OMAP_IH1_MIR);
 276                 MPUI1510_SAVE(OMAP_IH2_MIR);
 277                 MPUI1510_SAVE(MPUI_CTRL);
 278                 MPUI1510_SAVE(MPUI_DSP_BOOT_CONFIG);
 279                 MPUI1510_SAVE(MPUI_DSP_API_CONFIG);
 280                 MPUI1510_SAVE(EMIFS_CONFIG);
 281                 MPUI1510_SAVE(EMIFF_SDRAM_CONFIG);
 282         } else if (cpu_is_omap16xx()) {
 283                 MPUI1610_SAVE(OMAP_IH1_MIR);
 284                 MPUI1610_SAVE(OMAP_IH2_0_MIR);
 285                 MPUI1610_SAVE(OMAP_IH2_1_MIR);
 286                 MPUI1610_SAVE(OMAP_IH2_2_MIR);
 287                 MPUI1610_SAVE(OMAP_IH2_3_MIR);
 288                 MPUI1610_SAVE(MPUI_CTRL);
 289                 MPUI1610_SAVE(MPUI_DSP_BOOT_CONFIG);
 290                 MPUI1610_SAVE(MPUI_DSP_API_CONFIG);
 291                 MPUI1610_SAVE(EMIFS_CONFIG);
 292                 MPUI1610_SAVE(EMIFF_SDRAM_CONFIG);
 293         }
 294
 295         ARM_SAVE(ARM_CKCTL);
 296         ARM_SAVE(ARM_IDLECT1);
 297         ARM_SAVE(ARM_IDLECT2);
 298         if (!(cpu_is_omap15xx()))
 299                 ARM_SAVE(ARM_IDLECT3);
 300         ARM_SAVE(ARM_EWUPCT);
 301         ARM_SAVE(ARM_RSTCT1);
 302         ARM_SAVE(ARM_RSTCT2);
 303         ARM_SAVE(ARM_SYSST);
 304         ULPD_SAVE(ULPD_CLOCK_CTRL);
 305         ULPD_SAVE(ULPD_STATUS_REQ);
 306
 307         /* (Step 3 removed - we now allow deep sleep by default) */
 308
 309         /*
 310          * Step 4: OMAP DSP Shutdown
 311          */
 312
 313         /* stop DSP */
 314         omap_writew(omap_readw(ARM_RSTCT1) & ~(1 << DSP_EN), ARM_RSTCT1);
 315
 316                 /* shut down dsp_ck */
 317         if (!cpu_is_omap730())
 318                 omap_writew(omap_readw(ARM_CKCTL) & ~(1 << EN_DSPCK), ARM_CKCTL);
 319
 320         /* temporarily enabling api_ck to access DSP registers */
 321         omap_writew(omap_readw(ARM_IDLECT2) | 1 << EN_APICK, ARM_IDLECT2);
 322
 323         /* save DSP registers */
 324         DSP_SAVE(DSP_IDLECT2);
 325
 326         /* Stop all DSP domain clocks */
 327         __raw_writew(0, DSP_IDLECT2);
 328
 329         /*
 330          * Step 5: Wakeup Event Setup
 331          */
 332
 333         omap_pm_wakeup_setup();
 334
 335         /*
 336          * Step 6: ARM and Traffic controller shutdown
 337          */
 338
 339         /* disable ARM watchdog */
 340         omap_writel(0x00F5, OMAP_WDT_TIMER_MODE);
 341         omap_writel(0x00A0, OMAP_WDT_TIMER_MODE);
 342
 343         /*
 344          * Step 6b: ARM and Traffic controller shutdown
 345          *
 346          * Step 6 continues here. Prepare jump to power management
 347          * assembly code in internal SRAM.
 348          *
 349          * Since the omap_cpu_suspend routine has been copied to
 350          * SRAM, we'll do an indirect procedure call to it and pass the
 351          * contents of arm_idlect1 and arm_idlect2 so it can restore
 352          * them when it wakes up and it will return.
 353          */
 354
 355         arg0 = arm_sleep_save[ARM_SLEEP_SAVE_ARM_IDLECT1];
 356         arg1 = arm_sleep_save[ARM_SLEEP_SAVE_ARM_IDLECT2];
 357
 358         /*
 359          * Step 6c: ARM and Traffic controller shutdown
 360          *
 361          * Jump to assembly code. The processor will stay there
 362          * until wake up.
 363          */
 364         omap_sram_suspend(arg0, arg1);
 365
 366         /*
 367          * If we are here, processor is woken up!
 368          */
 369
 370         /*
 371          * Restore DSP clocks
 372          */
 373
 374         /* again temporarily enabling api_ck to access DSP registers */
 375         omap_writew(omap_readw(ARM_IDLECT2) | 1 << EN_APICK, ARM_IDLECT2);
 376
 377         /* Restore DSP domain clocks */
 378         DSP_RESTORE(DSP_IDLECT2);
 379
 380         /*
 381          * Restore ARM state, except ARM_IDLECT1/2 which omap_cpu_suspend did
 382          */
 383
 384         if (!(cpu_is_omap15xx()))
 385                 ARM_RESTORE(ARM_IDLECT3);
 386         ARM_RESTORE(ARM_CKCTL);
 387         ARM_RESTORE(ARM_EWUPCT);
 388         ARM_RESTORE(ARM_RSTCT1);
 389         ARM_RESTORE(ARM_RSTCT2);
 390         ARM_RESTORE(ARM_SYSST);
 391         ULPD_RESTORE(ULPD_CLOCK_CTRL);
 392         ULPD_RESTORE(ULPD_STATUS_REQ);
 393
 394         if (cpu_is_omap730()) {
 395                 MPUI730_RESTORE(EMIFS_CONFIG);
 396                 MPUI730_RESTORE(EMIFF_SDRAM_CONFIG);
 397                 MPUI730_RESTORE(OMAP_IH1_MIR);
 398                 MPUI730_RESTORE(OMAP_IH2_0_MIR);
 399                 MPUI730_RESTORE(OMAP_IH2_1_MIR);
 400         } else if (cpu_is_omap15xx()) {
 401                 MPUI1510_RESTORE(MPUI_CTRL);
 402                 MPUI1510_RESTORE(MPUI_DSP_BOOT_CONFIG);
 403                 MPUI1510_RESTORE(MPUI_DSP_API_CONFIG);
 404                 MPUI1510_RESTORE(EMIFS_CONFIG);
 405                 MPUI1510_RESTORE(EMIFF_SDRAM_CONFIG);
 406                 MPUI1510_RESTORE(OMAP_IH1_MIR);
 407                 MPUI1510_RESTORE(OMAP_IH2_MIR);
 408         } else if (cpu_is_omap16xx()) {
 409                 MPUI1610_RESTORE(MPUI_CTRL);
 410                 MPUI1610_RESTORE(MPUI_DSP_BOOT_CONFIG);
 411                 MPUI1610_RESTORE(MPUI_DSP_API_CONFIG);
 412                 MPUI1610_RESTORE(EMIFS_CONFIG);
 413                 MPUI1610_RESTORE(EMIFF_SDRAM_CONFIG);
 414
 415                 MPUI1610_RESTORE(OMAP_IH1_MIR);
 416                 MPUI1610_RESTORE(OMAP_IH2_0_MIR);
 417                 MPUI1610_RESTORE(OMAP_IH2_1_MIR);
 418                 MPUI1610_RESTORE(OMAP_IH2_2_MIR);
 419                 MPUI1610_RESTORE(OMAP_IH2_3_MIR);
 420         }
 421
 422         if (!cpu_is_omap15xx())
 423                 omap_writew(0, ULPD_SOFT_DISABLE_REQ_REG);
 424
 425         /*
 426          * Re-enable interrupts
 427          */
 428
 429         local_irq_enable();
 430         local_fiq_enable();
 431
 432         omap_serial_wake_trigger(0);
 433
 434         printk("PM: OMAP%x is re-starting from deep sleep...\n", system_rev);
 435 }
 436
 437 #if defined(DEBUG) && defined(CONFIG_PROC_FS)
 438 static int g_read_completed;
 439
 440 /*
 441  * Read system PM registers for debugging
 442  */
 443 static int omap_pm_read_proc(
 444         char *page_buffer,
 445         char **my_first_byte,
 446         off_t virtual_start,
 447         int length,
 448         int *eof,
 449         void *data)
 450 {
 451         int my_buffer_offset = 0;
 452         char * const my_base = page_buffer;
 453
 454         ARM_SAVE(ARM_CKCTL);
 455         ARM_SAVE(ARM_IDLECT1);
 456         ARM_SAVE(ARM_IDLECT2);
 457         if (!(cpu_is_omap15xx()))
 458                 ARM_SAVE(ARM_IDLECT3);
 459         ARM_SAVE(ARM_EWUPCT);
 460         ARM_SAVE(ARM_RSTCT1);
 461         ARM_SAVE(ARM_RSTCT2);
 462         ARM_SAVE(ARM_SYSST);
 463
 464         ULPD_SAVE(ULPD_IT_STATUS);
 465         ULPD_SAVE(ULPD_CLOCK_CTRL);
 466         ULPD_SAVE(ULPD_SOFT_REQ);
 467         ULPD_SAVE(ULPD_STATUS_REQ);
 468         ULPD_SAVE(ULPD_DPLL_CTRL);
 469         ULPD_SAVE(ULPD_POWER_CTRL);
 470
 471         if (cpu_is_omap730()) {
 472                 MPUI730_SAVE(MPUI_CTRL);
 473                 MPUI730_SAVE(MPUI_DSP_STATUS);
 474                 MPUI730_SAVE(MPUI_DSP_BOOT_CONFIG);
 475                 MPUI730_SAVE(MPUI_DSP_API_CONFIG);
 476                 MPUI730_SAVE(EMIFF_SDRAM_CONFIG);
 477                 MPUI730_SAVE(EMIFS_CONFIG);
 478         } else if (cpu_is_omap15xx()) {
 479                 MPUI1510_SAVE(MPUI_CTRL);
 480                 MPUI1510_SAVE(MPUI_DSP_STATUS);
 481                 MPUI1510_SAVE(MPUI_DSP_BOOT_CONFIG);
 482                 MPUI1510_SAVE(MPUI_DSP_API_CONFIG);
 483                 MPUI1510_SAVE(EMIFF_SDRAM_CONFIG);
 484                 MPUI1510_SAVE(EMIFS_CONFIG);
 485         } else if (cpu_is_omap16xx()) {
 486                 MPUI1610_SAVE(MPUI_CTRL);
 487                 MPUI1610_SAVE(MPUI_DSP_STATUS);
 488                 MPUI1610_SAVE(MPUI_DSP_BOOT_CONFIG);
 489                 MPUI1610_SAVE(MPUI_DSP_API_CONFIG);
 490                 MPUI1610_SAVE(EMIFF_SDRAM_CONFIG);
 491                 MPUI1610_SAVE(EMIFS_CONFIG);
 492         }
 493
 494         if (virtual_start == 0) {
 495                 g_read_completed = 0;
 496
 497                 my_buffer_offset += sprintf(my_base + my_buffer_offset,
 498                    "ARM_CKCTL_REG:            0x%-8x     \n"
 499                    "ARM_IDLECT1_REG:          0x%-8x     \n"
 500                    "ARM_IDLECT2_REG:          0x%-8x     \n"
 501                    "ARM_IDLECT3_REG:          0x%-8x     \n"
 502                    "ARM_EWUPCT_REG:           0x%-8x     \n"
 503                    "ARM_RSTCT1_REG:           0x%-8x     \n"
 504                    "ARM_RSTCT2_REG:           0x%-8x     \n"
 505                    "ARM_SYSST_REG:            0x%-8x     \n"
 506                    "ULPD_IT_STATUS_REG:       0x%-4x     \n"
 507                    "ULPD_CLOCK_CTRL_REG:      0x%-4x     \n"
 508                    "ULPD_SOFT_REQ_REG:        0x%-4x     \n"
 509                    "ULPD_DPLL_CTRL_REG:       0x%-4x     \n"
 510                    "ULPD_STATUS_REQ_REG:      0x%-4x     \n"
 511                    "ULPD_POWER_CTRL_REG:      0x%-4x     \n",
 512                    ARM_SHOW(ARM_CKCTL),
 513                    ARM_SHOW(ARM_IDLECT1),
 514                    ARM_SHOW(ARM_IDLECT2),
 515                    ARM_SHOW(ARM_IDLECT3),
 516                    ARM_SHOW(ARM_EWUPCT),
 517                    ARM_SHOW(ARM_RSTCT1),
 518                    ARM_SHOW(ARM_RSTCT2),
 519                    ARM_SHOW(ARM_SYSST),
 520                    ULPD_SHOW(ULPD_IT_STATUS),
 521                    ULPD_SHOW(ULPD_CLOCK_CTRL),
 522                    ULPD_SHOW(ULPD_SOFT_REQ),
 523                    ULPD_SHOW(ULPD_DPLL_CTRL),
 524                    ULPD_SHOW(ULPD_STATUS_REQ),
 525                    ULPD_SHOW(ULPD_POWER_CTRL));
 526
 527                 if (cpu_is_omap730()) {
 528                         my_buffer_offset += sprintf(my_base + my_buffer_offset,
 529                            "MPUI730_CTRL_REG         0x%-8x \n"
 530                            "MPUI730_DSP_STATUS_REG:      0x%-8x \n"
 531                            "MPUI730_DSP_BOOT_CONFIG_REG: 0x%-8x \n"
 532                            "MPUI730_DSP_API_CONFIG_REG:  0x%-8x \n"
 533                            "MPUI730_SDRAM_CONFIG_REG:    0x%-8x \n"
 534                            "MPUI730_EMIFS_CONFIG_REG:    0x%-8x \n",
 535                            MPUI730_SHOW(MPUI_CTRL),
 536                            MPUI730_SHOW(MPUI_DSP_STATUS),
 537                            MPUI730_SHOW(MPUI_DSP_BOOT_CONFIG),
 538                            MPUI730_SHOW(MPUI_DSP_API_CONFIG),
 539                            MPUI730_SHOW(EMIFF_SDRAM_CONFIG),
 540                            MPUI730_SHOW(EMIFS_CONFIG));
 541                 } else if (cpu_is_omap15xx()) {
 542                         my_buffer_offset += sprintf(my_base + my_buffer_offset,
 543                            "MPUI1510_CTRL_REG             0x%-8x \n"
 544                            "MPUI1510_DSP_STATUS_REG:      0x%-8x \n"
 545                            "MPUI1510_DSP_BOOT_CONFIG_REG: 0x%-8x \n"
 546                            "MPUI1510_DSP_API_CONFIG_REG:  0x%-8x \n"
 547                            "MPUI1510_SDRAM_CONFIG_REG:    0x%-8x \n"
 548                            "MPUI1510_EMIFS_CONFIG_REG:    0x%-8x \n",
 549                            MPUI1510_SHOW(MPUI_CTRL),
 550                            MPUI1510_SHOW(MPUI_DSP_STATUS),
 551                            MPUI1510_SHOW(MPUI_DSP_BOOT_CONFIG),
 552                            MPUI1510_SHOW(MPUI_DSP_API_CONFIG),
 553                            MPUI1510_SHOW(EMIFF_SDRAM_CONFIG),
 554                            MPUI1510_SHOW(EMIFS_CONFIG));
 555                 } else if (cpu_is_omap16xx()) {
 556                         my_buffer_offset += sprintf(my_base + my_buffer_offset,
 557                            "MPUI1610_CTRL_REG             0x%-8x \n"
 558                            "MPUI1610_DSP_STATUS_REG:      0x%-8x \n"
 559                            "MPUI1610_DSP_BOOT_CONFIG_REG: 0x%-8x \n"
 560                            "MPUI1610_DSP_API_CONFIG_REG:  0x%-8x \n"
 561                            "MPUI1610_SDRAM_CONFIG_REG:    0x%-8x \n"
 562                            "MPUI1610_EMIFS_CONFIG_REG:    0x%-8x \n",
 563                            MPUI1610_SHOW(MPUI_CTRL),
 564                            MPUI1610_SHOW(MPUI_DSP_STATUS),
 565                            MPUI1610_SHOW(MPUI_DSP_BOOT_CONFIG),
 566                            MPUI1610_SHOW(MPUI_DSP_API_CONFIG),
 567                            MPUI1610_SHOW(EMIFF_SDRAM_CONFIG),
 568                            MPUI1610_SHOW(EMIFS_CONFIG));
 569                 }
 570
 571                 g_read_completed++;
 572         } else if (g_read_completed >= 1) {
 573                  *eof = 1;
 574                  return 0;
 575         }
 576         g_read_completed++;
 577
 578         *my_first_byte = page_buffer;
 579         return  my_buffer_offset;
 580 }
 581
 582 static void omap_pm_init_proc(void)
 583 {
 584         struct proc_dir_entry *entry;
 585
 586         entry = create_proc_read_entry("driver/omap_pm",
 587                                        S_IWUSR | S_IRUGO, NULL,
 588                                        omap_pm_read_proc, NULL);
 589 }
 590
 591 #endif /* DEBUG && CONFIG_PROC_FS */
 592
 593 static void (*saved_idle)(void) = NULL;
 594
 595 /*
 596  *      omap_pm_prepare - Do preliminary suspend work.
 597  *
 598  */
 599 static int omap_pm_prepare(void)
 600 {
 601         /* We cannot sleep in idle until we have resumed */
 602         saved_idle = pm_idle;
 603         pm_idle = NULL;
 604
 605         return 0;
 606 }
 607
 608
 609 /*
 610  *      omap_pm_enter - Actually enter a sleep state.
 611  *      @state:         State we're entering.
 612  *
 613  */
 614
 615 static int omap_pm_enter(suspend_state_t state)
 616 {
 617         switch (state)
 618         {
 619         case PM_SUSPEND_STANDBY:
 620         case PM_SUSPEND_MEM:
 621                 omap_pm_suspend();
 622                 break;
 623         default:
 624                 return -EINVAL;
 625         }
 626
 627         return 0;
 628 }
 629
 630
 631 /**
 632  *      omap_pm_finish - Finish up suspend sequence.
 633  *
 634  *      This is called after we wake back up (or if entering the sleep state
 635  *      failed).
 636  */
 637
 638 static void omap_pm_finish(void)
 639 {
 640         pm_idle = saved_idle;
 641 }
 642
 643
 644 static irqreturn_t omap_wakeup_interrupt(int irq, void *dev)
 645 {
 646         return IRQ_HANDLED;
 647 }
 648
 649 static struct irqaction omap_wakeup_irq = {
 650         .name           = "peripheral wakeup",
 651         .flags          = IRQF_DISABLED,
 652         .handler        = omap_wakeup_interrupt
 653 };
 654
 655
 656
 657 static struct platform_suspend_ops omap_pm_ops ={
 658         .prepare        = omap_pm_prepare,
 659         .enter          = omap_pm_enter,
 660         .finish         = omap_pm_finish,
 661         .valid          = suspend_valid_only_mem,
 662 };
 663
 664 static int __init omap_pm_init(void)
 665 {
 666
 667 #ifdef CONFIG_OMAP_32K_TIMER
 668         int error;
 669 #endif
 670
 671         printk("Power Management for TI OMAP.\n");
 672
 673         /*
 674          * We copy the assembler sleep/wakeup routines to SRAM.
 675          * These routines need to be in SRAM as that's the only
 676          * memory the MPU can see when it wakes up.
 677          */
 678         if (cpu_is_omap730()) {
 679                 omap_sram_idle = omap_sram_push(omap730_idle_loop_suspend,
 680                                                 omap730_idle_loop_suspend_sz);
 681                 omap_sram_suspend = omap_sram_push(omap730_cpu_suspend,
 682                                                    omap730_cpu_suspend_sz);
 683         } else if (cpu_is_omap15xx()) {
 684                 omap_sram_idle = omap_sram_push(omap1510_idle_loop_suspend,
 685                                                 omap1510_idle_loop_suspend_sz);
 686                 omap_sram_suspend = omap_sram_push(omap1510_cpu_suspend,
 687                                                    omap1510_cpu_suspend_sz);
 688         } else if (cpu_is_omap16xx()) {
 689                 omap_sram_idle = omap_sram_push(omap1610_idle_loop_suspend,
 690                                                 omap1610_idle_loop_suspend_sz);
 691                 omap_sram_suspend = omap_sram_push(omap1610_cpu_suspend,
 692                                                    omap1610_cpu_suspend_sz);
 693         }
 694
 695         if (omap_sram_idle == NULL || omap_sram_suspend == NULL) {
 696                 printk(KERN_ERR "PM not initialized: Missing SRAM support\n");
 697                 return -ENODEV;
 698         }
 699
 700         pm_idle = omap_pm_idle;
 701
 702         if (cpu_is_omap730())
 703                 setup_irq(INT_730_WAKE_UP_REQ, &omap_wakeup_irq);
 704         else if (cpu_is_omap16xx())
 705                 setup_irq(INT_1610_WAKE_UP_REQ, &omap_wakeup_irq);
 706
 707         /* Program new power ramp-up time
 708          * (0 for most boards since we don't lower voltage when in deep sleep)
 709          */
 710         omap_writew(ULPD_SETUP_ANALOG_CELL_3_VAL, ULPD_SETUP_ANALOG_CELL_3);
 711
 712         /* Setup ULPD POWER_CTRL_REG - enter deep sleep whenever possible */
 713         omap_writew(ULPD_POWER_CTRL_REG_VAL, ULPD_POWER_CTRL);
 714
 715         /* Configure IDLECT3 */
 716         if (cpu_is_omap730())
 717                 omap_writel(OMAP730_IDLECT3_VAL, OMAP730_IDLECT3);
 718         else if (cpu_is_omap16xx())
 719                 omap_writel(OMAP1610_IDLECT3_VAL, OMAP1610_IDLECT3);
 720
 721         suspend_set_ops(&omap_pm_ops);
 722
 723 #if defined(DEBUG) && defined(CONFIG_PROC_FS)
 724         omap_pm_init_proc();
 725 #endif
 726
 727 #ifdef CONFIG_OMAP_32K_TIMER
 728         error = sysfs_create_file(power_kobj, &sleep_while_idle_attr);
 729         if (error)
 730                 printk(KERN_ERR "sysfs_create_file failed: %d\n", error);
 731 #endif
 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);