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/dmtimer.h>
  61
  62 static unsigned int arm_sleep_save[ARM_SLEEP_SAVE_SIZE];
  63 static unsigned short dsp_sleep_save[DSP_SLEEP_SAVE_SIZE];
  64 static unsigned short ulpd_sleep_save[ULPD_SLEEP_SAVE_SIZE];
  65 static unsigned int mpui730_sleep_save[MPUI730_SLEEP_SAVE_SIZE];
  66 static unsigned int mpui1510_sleep_save[MPUI1510_SLEEP_SAVE_SIZE];
  67 static unsigned int mpui1610_sleep_save[MPUI1610_SLEEP_SAVE_SIZE];
  68
  69 #ifdef CONFIG_OMAP_32K_TIMER
  70
  71 static unsigned short enable_dyn_sleep = 1;
  72
  73 static ssize_t idle_show(struct kobject *kobj, struct kobj_attribute *attr,
  74                          char *buf)
  75 {
  76         return sprintf(buf, "%hu\n", enable_dyn_sleep);
  77 }
  78
  79 static ssize_t idle_store(struct kobject *kobj, struct kobj_attribute *attr,
  80                           const char * buf, size_t n)
  81 {
  82         unsigned short value;
  83         if (sscanf(buf, "%hu", &value) != 1 ||
  84             (value != 0 && value != 1)) {
  85                 printk(KERN_ERR "idle_sleep_store: Invalid value\n");
  86                 return -EINVAL;
  87         }
  88         enable_dyn_sleep = value;
  89         return n;
  90 }
  91
  92 static struct kobj_attribute sleep_while_idle_attr =
  93         __ATTR(sleep_while_idle, 0644, idle_show, idle_store);
  94
  95 #endif
  96
  97 static void (*omap_sram_suspend)(unsigned long r0, unsigned long r1) = NULL;
  98
  99 /*
 100  * Let's power down on idle, but only if we are really
 101  * idle, because once we start down the path of
 102  * going idle we continue to do idle even if we get
 103  * a clock tick interrupt . .
 104  */
 105 void omap_pm_idle(void)
 106 {
 107         extern __u32 arm_idlect1_mask;
 108         __u32 use_idlect1 = arm_idlect1_mask;
 109         int do_sleep = 0;
 110
 111         local_irq_disable();
 112         local_fiq_disable();
 113         if (need_resched()) {
 114                 local_fiq_enable();
 115                 local_irq_enable();
 116                 return;
 117         }
 118
 119         /*
 120          * Since an interrupt may set up a timer, we don't want to
 121          * reprogram the hardware timer with interrupts enabled.
 122          * Re-enable interrupts only after returning from idle.
 123          */
 124         timer_dyn_reprogram();
 125
 126 #ifdef CONFIG_OMAP_MPU_TIMER
 127 #warning Enable 32kHz OS timer in order to allow sleep states in idle
 128         use_idlect1 = use_idlect1 & ~(1 << 9);
 129 #else
 130
 131         while (enable_dyn_sleep) {
 132
 133 #ifdef CONFIG_CBUS_TAHVO_USB
 134                 extern int vbus_active;
 135                 /* Clock requirements? */
 136                 if (vbus_active)
 137                         break;
 138 #endif
 139                 do_sleep = 1;
 140                 break;
 141         }
 142
 143 #endif
 144
 145 #ifdef CONFIG_OMAP_DM_TIMER
 146         use_idlect1 = omap_dm_timer_modify_idlect_mask(use_idlect1);
 147 #endif
 148
 149         if (omap_dma_running())
 150                 use_idlect1 &= ~(1 << 6);
 151
 152         /* We should be able to remove the do_sleep variable and multiple
 153          * tests above as soon as drivers, timer and DMA code have been fixed.
 154          * Even the sleep block count should become obsolete. */
 155         if ((use_idlect1 != ~0) || !do_sleep) {
 156
 157                 __u32 saved_idlect1 = omap_readl(ARM_IDLECT1);
 158                 if (cpu_is_omap15xx())
 159                         use_idlect1 &= OMAP1510_BIG_SLEEP_REQUEST;
 160                 else
 161                         use_idlect1 &= OMAP1610_IDLECT1_SLEEP_VAL;
 162                 omap_writel(use_idlect1, ARM_IDLECT1);
 163                 __asm__ volatile ("mcr  p15, 0, r0, c7, c0, 4");
 164                 omap_writel(saved_idlect1, ARM_IDLECT1);
 165
 166                 local_fiq_enable();
 167                 local_irq_enable();
 168                 return;
 169         }
 170         omap_sram_suspend(omap_readl(ARM_IDLECT1),
 171                           omap_readl(ARM_IDLECT2));
 172
 173         local_fiq_enable();
 174         local_irq_enable();
 175 }
 176
 177 /*
 178  * Configuration of the wakeup event is board specific. For the
 179  * moment we put it into this helper function. Later it may move
 180  * to board specific files.
 181  */
 182 static void omap_pm_wakeup_setup(void)
 183 {
 184         u32 level1_wake = 0;
 185         u32 level2_wake = OMAP_IRQ_BIT(INT_UART2);
 186
 187         /*
 188          * Turn off all interrupts except GPIO bank 1, L1-2nd level cascade,
 189          * and the L2 wakeup interrupts: keypad and UART2. Note that the
 190          * drivers must still separately call omap_set_gpio_wakeup() to
 191          * wake up to a GPIO interrupt.
 192          */
 193         if (cpu_is_omap730())
 194                 level1_wake = OMAP_IRQ_BIT(INT_730_GPIO_BANK1) |
 195                         OMAP_IRQ_BIT(INT_730_IH2_IRQ);
 196         else if (cpu_is_omap15xx())
 197                 level1_wake = OMAP_IRQ_BIT(INT_GPIO_BANK1) |
 198                         OMAP_IRQ_BIT(INT_1510_IH2_IRQ);
 199         else if (cpu_is_omap16xx())
 200                 level1_wake = OMAP_IRQ_BIT(INT_GPIO_BANK1) |
 201                         OMAP_IRQ_BIT(INT_1610_IH2_IRQ);
 202
 203         omap_writel(~level1_wake, OMAP_IH1_MIR);
 204
 205         if (cpu_is_omap730()) {
 206                 omap_writel(~level2_wake, OMAP_IH2_0_MIR);
 207                 omap_writel(~(OMAP_IRQ_BIT(INT_730_WAKE_UP_REQ) |
 208                                 OMAP_IRQ_BIT(INT_730_MPUIO_KEYPAD)),
 209                                 OMAP_IH2_1_MIR);
 210         } else if (cpu_is_omap15xx()) {
 211                 level2_wake |= OMAP_IRQ_BIT(INT_KEYBOARD);
 212                 omap_writel(~level2_wake,  OMAP_IH2_MIR);
 213         } else if (cpu_is_omap16xx()) {
 214                 level2_wake |= OMAP_IRQ_BIT(INT_KEYBOARD);
 215                 omap_writel(~level2_wake, OMAP_IH2_0_MIR);
 216
 217                 /* INT_1610_WAKE_UP_REQ is needed for GPIO wakeup... */
 218                 omap_writel(~OMAP_IRQ_BIT(INT_1610_WAKE_UP_REQ),
 219                             OMAP_IH2_1_MIR);
 220                 omap_writel(~0x0, OMAP_IH2_2_MIR);
 221                 omap_writel(~0x0, OMAP_IH2_3_MIR);
 222         }
 223
 224         /*  New IRQ agreement, recalculate in cascade order */
 225         omap_writel(1, OMAP_IH2_CONTROL);
 226         omap_writel(1, OMAP_IH1_CONTROL);
 227 }
 228
 229 #define EN_DSPCK        13      /* ARM_CKCTL */
 230 #define EN_APICK        6       /* ARM_IDLECT2 */
 231 #define DSP_EN          1       /* ARM_RSTCT1 */
 232
 233 void omap_pm_suspend(void)
 234 {
 235         unsigned long arg0 = 0, arg1 = 0;
 236
 237         printk("PM: OMAP%x is trying to enter deep sleep...\n", system_rev);
 238
 239         omap_serial_wake_trigger(1);
 240
 241         if (!cpu_is_omap15xx())
 242                 omap_writew(0xffff, ULPD_SOFT_DISABLE_REQ_REG);
 243
 244         /*
 245          * Step 1: turn off interrupts (FIXME: NOTE: already disabled)
 246          */
 247
 248         local_irq_disable();
 249         local_fiq_disable();
 250
 251         /*
 252          * Step 2: save registers
 253          *
 254          * The omap is a strange/beautiful device. The caches, memory
 255          * and register state are preserved across power saves.
 256          * We have to save and restore very little register state to
 257          * idle the omap.
 258          *
 259          * Save interrupt, MPUI, ARM and UPLD control registers.
 260          */
 261
 262         if (cpu_is_omap730()) {
 263                 MPUI730_SAVE(OMAP_IH1_MIR);
 264                 MPUI730_SAVE(OMAP_IH2_0_MIR);
 265                 MPUI730_SAVE(OMAP_IH2_1_MIR);
 266                 MPUI730_SAVE(MPUI_CTRL);
 267                 MPUI730_SAVE(MPUI_DSP_BOOT_CONFIG);
 268                 MPUI730_SAVE(MPUI_DSP_API_CONFIG);
 269                 MPUI730_SAVE(EMIFS_CONFIG);
 270                 MPUI730_SAVE(EMIFF_SDRAM_CONFIG);
 271
 272         } else if (cpu_is_omap15xx()) {
 273                 MPUI1510_SAVE(OMAP_IH1_MIR);
 274                 MPUI1510_SAVE(OMAP_IH2_MIR);
 275                 MPUI1510_SAVE(MPUI_CTRL);
 276                 MPUI1510_SAVE(MPUI_DSP_BOOT_CONFIG);
 277                 MPUI1510_SAVE(MPUI_DSP_API_CONFIG);
 278                 MPUI1510_SAVE(EMIFS_CONFIG);
 279                 MPUI1510_SAVE(EMIFF_SDRAM_CONFIG);
 280         } else if (cpu_is_omap16xx()) {
 281                 MPUI1610_SAVE(OMAP_IH1_MIR);
 282                 MPUI1610_SAVE(OMAP_IH2_0_MIR);
 283                 MPUI1610_SAVE(OMAP_IH2_1_MIR);
 284                 MPUI1610_SAVE(OMAP_IH2_2_MIR);
 285                 MPUI1610_SAVE(OMAP_IH2_3_MIR);
 286                 MPUI1610_SAVE(MPUI_CTRL);
 287                 MPUI1610_SAVE(MPUI_DSP_BOOT_CONFIG);
 288                 MPUI1610_SAVE(MPUI_DSP_API_CONFIG);
 289                 MPUI1610_SAVE(EMIFS_CONFIG);
 290                 MPUI1610_SAVE(EMIFF_SDRAM_CONFIG);
 291         }
 292
 293         ARM_SAVE(ARM_CKCTL);
 294         ARM_SAVE(ARM_IDLECT1);
 295         ARM_SAVE(ARM_IDLECT2);
 296         if (!(cpu_is_omap15xx()))
 297                 ARM_SAVE(ARM_IDLECT3);
 298         ARM_SAVE(ARM_EWUPCT);
 299         ARM_SAVE(ARM_RSTCT1);
 300         ARM_SAVE(ARM_RSTCT2);
 301         ARM_SAVE(ARM_SYSST);
 302         ULPD_SAVE(ULPD_CLOCK_CTRL);
 303         ULPD_SAVE(ULPD_STATUS_REQ);
 304
 305         /* (Step 3 removed - we now allow deep sleep by default) */
 306
 307         /*
 308          * Step 4: OMAP DSP Shutdown
 309          */
 310
 311         /* stop DSP */
 312         omap_writew(omap_readw(ARM_RSTCT1) & ~(1 << DSP_EN), ARM_RSTCT1);
 313
 314                 /* shut down dsp_ck */
 315         if (!cpu_is_omap730())
 316                 omap_writew(omap_readw(ARM_CKCTL) & ~(1 << EN_DSPCK), ARM_CKCTL);
 317
 318         /* temporarily enabling api_ck to access DSP registers */
 319         omap_writew(omap_readw(ARM_IDLECT2) | 1 << EN_APICK, ARM_IDLECT2);
 320
 321         /* save DSP registers */
 322         DSP_SAVE(DSP_IDLECT2);
 323
 324         /* Stop all DSP domain clocks */
 325         __raw_writew(0, DSP_IDLECT2);
 326
 327         /*
 328          * Step 5: Wakeup Event Setup
 329          */
 330
 331         omap_pm_wakeup_setup();
 332
 333         /*
 334          * Step 6: ARM and Traffic controller shutdown
 335          */
 336
 337         /* disable ARM watchdog */
 338         omap_writel(0x00F5, OMAP_WDT_TIMER_MODE);
 339         omap_writel(0x00A0, OMAP_WDT_TIMER_MODE);
 340
 341         /*
 342          * Step 6b: ARM and Traffic controller shutdown
 343          *
 344          * Step 6 continues here. Prepare jump to power management
 345          * assembly code in internal SRAM.
 346          *
 347          * Since the omap_cpu_suspend routine has been copied to
 348          * SRAM, we'll do an indirect procedure call to it and pass the
 349          * contents of arm_idlect1 and arm_idlect2 so it can restore
 350          * them when it wakes up and it will return.
 351          */
 352
 353         arg0 = arm_sleep_save[ARM_SLEEP_SAVE_ARM_IDLECT1];
 354         arg1 = arm_sleep_save[ARM_SLEEP_SAVE_ARM_IDLECT2];
 355
 356         /*
 357          * Step 6c: ARM and Traffic controller shutdown
 358          *
 359          * Jump to assembly code. The processor will stay there
 360          * until wake up.
 361          */
 362         omap_sram_suspend(arg0, arg1);
 363
 364         /*
 365          * If we are here, processor is woken up!
 366          */
 367
 368         /*
 369          * Restore DSP clocks
 370          */
 371
 372         /* again temporarily enabling api_ck to access DSP registers */
 373         omap_writew(omap_readw(ARM_IDLECT2) | 1 << EN_APICK, ARM_IDLECT2);
 374
 375         /* Restore DSP domain clocks */
 376         DSP_RESTORE(DSP_IDLECT2);
 377
 378         /*
 379          * Restore ARM state, except ARM_IDLECT1/2 which omap_cpu_suspend did
 380          */
 381
 382         if (!(cpu_is_omap15xx()))
 383                 ARM_RESTORE(ARM_IDLECT3);
 384         ARM_RESTORE(ARM_CKCTL);
 385         ARM_RESTORE(ARM_EWUPCT);
 386         ARM_RESTORE(ARM_RSTCT1);
 387         ARM_RESTORE(ARM_RSTCT2);
 388         ARM_RESTORE(ARM_SYSST);
 389         ULPD_RESTORE(ULPD_CLOCK_CTRL);
 390         ULPD_RESTORE(ULPD_STATUS_REQ);
 391
 392         if (cpu_is_omap730()) {
 393                 MPUI730_RESTORE(EMIFS_CONFIG);
 394                 MPUI730_RESTORE(EMIFF_SDRAM_CONFIG);
 395                 MPUI730_RESTORE(OMAP_IH1_MIR);
 396                 MPUI730_RESTORE(OMAP_IH2_0_MIR);
 397                 MPUI730_RESTORE(OMAP_IH2_1_MIR);
 398         } else if (cpu_is_omap15xx()) {
 399                 MPUI1510_RESTORE(MPUI_CTRL);
 400                 MPUI1510_RESTORE(MPUI_DSP_BOOT_CONFIG);
 401                 MPUI1510_RESTORE(MPUI_DSP_API_CONFIG);
 402                 MPUI1510_RESTORE(EMIFS_CONFIG);
 403                 MPUI1510_RESTORE(EMIFF_SDRAM_CONFIG);
 404                 MPUI1510_RESTORE(OMAP_IH1_MIR);
 405                 MPUI1510_RESTORE(OMAP_IH2_MIR);
 406         } else if (cpu_is_omap16xx()) {
 407                 MPUI1610_RESTORE(MPUI_CTRL);
 408                 MPUI1610_RESTORE(MPUI_DSP_BOOT_CONFIG);
 409                 MPUI1610_RESTORE(MPUI_DSP_API_CONFIG);
 410                 MPUI1610_RESTORE(EMIFS_CONFIG);
 411                 MPUI1610_RESTORE(EMIFF_SDRAM_CONFIG);
 412
 413                 MPUI1610_RESTORE(OMAP_IH1_MIR);
 414                 MPUI1610_RESTORE(OMAP_IH2_0_MIR);
 415                 MPUI1610_RESTORE(OMAP_IH2_1_MIR);
 416                 MPUI1610_RESTORE(OMAP_IH2_2_MIR);
 417                 MPUI1610_RESTORE(OMAP_IH2_3_MIR);
 418         }
 419
 420         if (!cpu_is_omap15xx())
 421                 omap_writew(0, ULPD_SOFT_DISABLE_REQ_REG);
 422
 423         /*
 424          * Re-enable interrupts
 425          */
 426
 427         local_irq_enable();
 428         local_fiq_enable();
 429
 430         omap_serial_wake_trigger(0);
 431
 432         printk("PM: OMAP%x is re-starting from deep sleep...\n", system_rev);
 433 }
 434
 435 #if defined(DEBUG) && defined(CONFIG_PROC_FS)
 436 static int g_read_completed;
 437
 438 /*
 439  * Read system PM registers for debugging
 440  */
 441 static int omap_pm_read_proc(
 442         char *page_buffer,
 443         char **my_first_byte,
 444         off_t virtual_start,
 445         int length,
 446         int *eof,
 447         void *data)
 448 {
 449         int my_buffer_offset = 0;
 450         char * const my_base = page_buffer;
 451
 452         ARM_SAVE(ARM_CKCTL);
 453         ARM_SAVE(ARM_IDLECT1);
 454         ARM_SAVE(ARM_IDLECT2);
 455         if (!(cpu_is_omap15xx()))
 456                 ARM_SAVE(ARM_IDLECT3);
 457         ARM_SAVE(ARM_EWUPCT);
 458         ARM_SAVE(ARM_RSTCT1);
 459         ARM_SAVE(ARM_RSTCT2);
 460         ARM_SAVE(ARM_SYSST);
 461
 462         ULPD_SAVE(ULPD_IT_STATUS);
 463         ULPD_SAVE(ULPD_CLOCK_CTRL);
 464         ULPD_SAVE(ULPD_SOFT_REQ);
 465         ULPD_SAVE(ULPD_STATUS_REQ);
 466         ULPD_SAVE(ULPD_DPLL_CTRL);
 467         ULPD_SAVE(ULPD_POWER_CTRL);
 468
 469         if (cpu_is_omap730()) {
 470                 MPUI730_SAVE(MPUI_CTRL);
 471                 MPUI730_SAVE(MPUI_DSP_STATUS);
 472                 MPUI730_SAVE(MPUI_DSP_BOOT_CONFIG);
 473                 MPUI730_SAVE(MPUI_DSP_API_CONFIG);
 474                 MPUI730_SAVE(EMIFF_SDRAM_CONFIG);
 475                 MPUI730_SAVE(EMIFS_CONFIG);
 476         } else if (cpu_is_omap15xx()) {
 477                 MPUI1510_SAVE(MPUI_CTRL);
 478                 MPUI1510_SAVE(MPUI_DSP_STATUS);
 479                 MPUI1510_SAVE(MPUI_DSP_BOOT_CONFIG);
 480                 MPUI1510_SAVE(MPUI_DSP_API_CONFIG);
 481                 MPUI1510_SAVE(EMIFF_SDRAM_CONFIG);
 482                 MPUI1510_SAVE(EMIFS_CONFIG);
 483         } else if (cpu_is_omap16xx()) {
 484                 MPUI1610_SAVE(MPUI_CTRL);
 485                 MPUI1610_SAVE(MPUI_DSP_STATUS);
 486                 MPUI1610_SAVE(MPUI_DSP_BOOT_CONFIG);
 487                 MPUI1610_SAVE(MPUI_DSP_API_CONFIG);
 488                 MPUI1610_SAVE(EMIFF_SDRAM_CONFIG);
 489                 MPUI1610_SAVE(EMIFS_CONFIG);
 490         }
 491
 492         if (virtual_start == 0) {
 493                 g_read_completed = 0;
 494
 495                 my_buffer_offset += sprintf(my_base + my_buffer_offset,
 496                    "ARM_CKCTL_REG:            0x%-8x     \n"
 497                    "ARM_IDLECT1_REG:          0x%-8x     \n"
 498                    "ARM_IDLECT2_REG:          0x%-8x     \n"
 499                    "ARM_IDLECT3_REG:          0x%-8x     \n"
 500                    "ARM_EWUPCT_REG:           0x%-8x     \n"
 501                    "ARM_RSTCT1_REG:           0x%-8x     \n"
 502                    "ARM_RSTCT2_REG:           0x%-8x     \n"
 503                    "ARM_SYSST_REG:            0x%-8x     \n"
 504                    "ULPD_IT_STATUS_REG:       0x%-4x     \n"
 505                    "ULPD_CLOCK_CTRL_REG:      0x%-4x     \n"
 506                    "ULPD_SOFT_REQ_REG:        0x%-4x     \n"
 507                    "ULPD_DPLL_CTRL_REG:       0x%-4x     \n"
 508                    "ULPD_STATUS_REQ_REG:      0x%-4x     \n"
 509                    "ULPD_POWER_CTRL_REG:      0x%-4x     \n",
 510                    ARM_SHOW(ARM_CKCTL),
 511                    ARM_SHOW(ARM_IDLECT1),
 512                    ARM_SHOW(ARM_IDLECT2),
 513                    ARM_SHOW(ARM_IDLECT3),
 514                    ARM_SHOW(ARM_EWUPCT),
 515                    ARM_SHOW(ARM_RSTCT1),
 516                    ARM_SHOW(ARM_RSTCT2),
 517                    ARM_SHOW(ARM_SYSST),
 518                    ULPD_SHOW(ULPD_IT_STATUS),
 519                    ULPD_SHOW(ULPD_CLOCK_CTRL),
 520                    ULPD_SHOW(ULPD_SOFT_REQ),
 521                    ULPD_SHOW(ULPD_DPLL_CTRL),
 522                    ULPD_SHOW(ULPD_STATUS_REQ),
 523                    ULPD_SHOW(ULPD_POWER_CTRL));
 524
 525                 if (cpu_is_omap730()) {
 526                         my_buffer_offset += sprintf(my_base + my_buffer_offset,
 527                            "MPUI730_CTRL_REG         0x%-8x \n"
 528                            "MPUI730_DSP_STATUS_REG:      0x%-8x \n"
 529                            "MPUI730_DSP_BOOT_CONFIG_REG: 0x%-8x \n"
 530                            "MPUI730_DSP_API_CONFIG_REG:  0x%-8x \n"
 531                            "MPUI730_SDRAM_CONFIG_REG:    0x%-8x \n"
 532                            "MPUI730_EMIFS_CONFIG_REG:    0x%-8x \n",
 533                            MPUI730_SHOW(MPUI_CTRL),
 534                            MPUI730_SHOW(MPUI_DSP_STATUS),
 535                            MPUI730_SHOW(MPUI_DSP_BOOT_CONFIG),
 536                            MPUI730_SHOW(MPUI_DSP_API_CONFIG),
 537                            MPUI730_SHOW(EMIFF_SDRAM_CONFIG),
 538                            MPUI730_SHOW(EMIFS_CONFIG));
 539                 } else if (cpu_is_omap15xx()) {
 540                         my_buffer_offset += sprintf(my_base + my_buffer_offset,
 541                            "MPUI1510_CTRL_REG             0x%-8x \n"
 542                            "MPUI1510_DSP_STATUS_REG:      0x%-8x \n"
 543                            "MPUI1510_DSP_BOOT_CONFIG_REG: 0x%-8x \n"
 544                            "MPUI1510_DSP_API_CONFIG_REG:  0x%-8x \n"
 545                            "MPUI1510_SDRAM_CONFIG_REG:    0x%-8x \n"
 546                            "MPUI1510_EMIFS_CONFIG_REG:    0x%-8x \n",
 547                            MPUI1510_SHOW(MPUI_CTRL),
 548                            MPUI1510_SHOW(MPUI_DSP_STATUS),
 549                            MPUI1510_SHOW(MPUI_DSP_BOOT_CONFIG),
 550                            MPUI1510_SHOW(MPUI_DSP_API_CONFIG),
 551                            MPUI1510_SHOW(EMIFF_SDRAM_CONFIG),
 552                            MPUI1510_SHOW(EMIFS_CONFIG));
 553                 } else if (cpu_is_omap16xx()) {
 554                         my_buffer_offset += sprintf(my_base + my_buffer_offset,
 555                            "MPUI1610_CTRL_REG             0x%-8x \n"
 556                            "MPUI1610_DSP_STATUS_REG:      0x%-8x \n"
 557                            "MPUI1610_DSP_BOOT_CONFIG_REG: 0x%-8x \n"
 558                            "MPUI1610_DSP_API_CONFIG_REG:  0x%-8x \n"
 559                            "MPUI1610_SDRAM_CONFIG_REG:    0x%-8x \n"
 560                            "MPUI1610_EMIFS_CONFIG_REG:    0x%-8x \n",
 561                            MPUI1610_SHOW(MPUI_CTRL),
 562                            MPUI1610_SHOW(MPUI_DSP_STATUS),
 563                            MPUI1610_SHOW(MPUI_DSP_BOOT_CONFIG),
 564                            MPUI1610_SHOW(MPUI_DSP_API_CONFIG),
 565                            MPUI1610_SHOW(EMIFF_SDRAM_CONFIG),
 566                            MPUI1610_SHOW(EMIFS_CONFIG));
 567                 }
 568
 569                 g_read_completed++;
 570         } else if (g_read_completed >= 1) {
 571                  *eof = 1;
 572                  return 0;
 573         }
 574         g_read_completed++;
 575
 576         *my_first_byte = page_buffer;
 577         return  my_buffer_offset;
 578 }
 579
 580 static void omap_pm_init_proc(void)
 581 {
 582         struct proc_dir_entry *entry;
 583
 584         entry = create_proc_read_entry("driver/omap_pm",
 585                                        S_IWUSR | S_IRUGO, NULL,
 586                                        omap_pm_read_proc, NULL);
 587 }
 588
 589 #endif /* DEBUG && CONFIG_PROC_FS */
 590
 591 static void (*saved_idle)(void) = NULL;
 592
 593 /*
 594  *      omap_pm_prepare - Do preliminary suspend work.
 595  *
 596  */
 597 static int omap_pm_prepare(void)
 598 {
 599         /* We cannot sleep in idle until we have resumed */
 600         saved_idle = pm_idle;
 601         pm_idle = NULL;
 602
 603         return 0;
 604 }
 605
 606
 607 /*
 608  *      omap_pm_enter - Actually enter a sleep state.
 609  *      @state:         State we're entering.
 610  *
 611  */
 612
 613 static int omap_pm_enter(suspend_state_t state)
 614 {
 615         switch (state)
 616         {
 617         case PM_SUSPEND_STANDBY:
 618         case PM_SUSPEND_MEM:
 619                 omap_pm_suspend();
 620                 break;
 621         default:
 622                 return -EINVAL;
 623         }
 624
 625         return 0;
 626 }
 627
 628
 629 /**
 630  *      omap_pm_finish - Finish up suspend sequence.
 631  *
 632  *      This is called after we wake back up (or if entering the sleep state
 633  *      failed).
 634  */
 635
 636 static void omap_pm_finish(void)
 637 {
 638         pm_idle = saved_idle;
 639 }
 640
 641
 642 static irqreturn_t omap_wakeup_interrupt(int irq, void *dev)
 643 {
 644         return IRQ_HANDLED;
 645 }
 646
 647 static struct irqaction omap_wakeup_irq = {
 648         .name           = "peripheral wakeup",
 649         .flags          = IRQF_DISABLED,
 650         .handler        = omap_wakeup_interrupt
 651 };
 652
 653
 654
 655 static struct platform_suspend_ops omap_pm_ops ={
 656         .prepare        = omap_pm_prepare,
 657         .enter          = omap_pm_enter,
 658         .finish         = omap_pm_finish,
 659         .valid          = suspend_valid_only_mem,
 660 };
 661
 662 static int __init omap_pm_init(void)
 663 {
 664
 665 #ifdef CONFIG_OMAP_32K_TIMER
 666         int error;
 667 #endif
 668
 669         printk("Power Management for TI OMAP.\n");
 670
 671         /*
 672          * We copy the assembler sleep/wakeup routines to SRAM.
 673          * These routines need to be in SRAM as that's the only
 674          * memory the MPU can see when it wakes up.
 675          */
 676         if (cpu_is_omap730()) {
 677                 omap_sram_suspend = omap_sram_push(omap730_cpu_suspend,
 678                                                    omap730_cpu_suspend_sz);
 679         } else if (cpu_is_omap15xx()) {
 680                 omap_sram_suspend = omap_sram_push(omap1510_cpu_suspend,
 681                                                    omap1510_cpu_suspend_sz);
 682         } else if (cpu_is_omap16xx()) {
 683                 omap_sram_suspend = omap_sram_push(omap1610_cpu_suspend,
 684                                                    omap1610_cpu_suspend_sz);
 685         }
 686
 687         if (omap_sram_suspend == NULL) {
 688                 printk(KERN_ERR "PM not initialized: Missing SRAM support\n");
 689                 return -ENODEV;
 690         }
 691
 692         pm_idle = omap_pm_idle;
 693
 694         if (cpu_is_omap730())
 695                 setup_irq(INT_730_WAKE_UP_REQ, &omap_wakeup_irq);
 696         else if (cpu_is_omap16xx())
 697                 setup_irq(INT_1610_WAKE_UP_REQ, &omap_wakeup_irq);
 698
 699         /* Program new power ramp-up time
 700          * (0 for most boards since we don't lower voltage when in deep sleep)
 701          */
 702         omap_writew(ULPD_SETUP_ANALOG_CELL_3_VAL, ULPD_SETUP_ANALOG_CELL_3);
 703
 704         /* Setup ULPD POWER_CTRL_REG - enter deep sleep whenever possible */
 705         omap_writew(ULPD_POWER_CTRL_REG_VAL, ULPD_POWER_CTRL);
 706
 707         /* Configure IDLECT3 */
 708         if (cpu_is_omap730())
 709                 omap_writel(OMAP730_IDLECT3_VAL, OMAP730_IDLECT3);
 710         else if (cpu_is_omap16xx())
 711                 omap_writel(OMAP1610_IDLECT3_VAL, OMAP1610_IDLECT3);
 712
 713         suspend_set_ops(&omap_pm_ops);
 714
 715 #if defined(DEBUG) && defined(CONFIG_PROC_FS)
 716         omap_pm_init_proc();
 717 #endif
 718
 719 #ifdef CONFIG_OMAP_32K_TIMER
 720         error = sysfs_create_file(power_kobj, &sleep_while_idle_attr.attr);
 721         if (error)
 722                 printk(KERN_ERR "sysfs_create_file failed: %d\n", error);
 723 #endif
 724
 725         if (cpu_is_omap16xx()) {
 726                 /* configure LOW_PWR pin */
 727                 omap_cfg_reg(T20_1610_LOW_PWR);
 728         }
 729
 730         return 0;
 731 }
 732 __initcall(omap_pm_init);