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 #include <linux/io.h>
  45 #include <linux/atomic.h>
  46
  47 #include <asm/system_misc.h>
  48 #include <asm/irq.h>
  49 #include <asm/mach/time.h>
  50 #include <asm/mach/irq.h>
  51
  52 #include <plat/cpu.h>
  53 #include <plat/clock.h>
  54 #include <plat/sram.h>
  55 #include <plat/tc.h>
  56 #include <mach/mux.h>
  57 #include <plat/dma.h>
  58 #include <plat/dmtimer.h>
  59
  60 #include <mach/irqs.h>
  61
  62 #include "iomap.h"
  63 #include "pm.h"
  64
  65 static unsigned int arm_sleep_save[ARM_SLEEP_SAVE_SIZE];
  66 static unsigned short dsp_sleep_save[DSP_SLEEP_SAVE_SIZE];
  67 static unsigned short ulpd_sleep_save[ULPD_SLEEP_SAVE_SIZE];
  68 static unsigned int mpui7xx_sleep_save[MPUI7XX_SLEEP_SAVE_SIZE];
  69 static unsigned int mpui1510_sleep_save[MPUI1510_SLEEP_SAVE_SIZE];
  70 static unsigned int mpui1610_sleep_save[MPUI1610_SLEEP_SAVE_SIZE];
  71
  72 #ifdef CONFIG_OMAP_32K_TIMER
  73
  74 static unsigned short enable_dyn_sleep = 1;
  75
  76 static ssize_t idle_show(struct kobject *kobj, struct kobj_attribute *attr,
  77                          char *buf)
  78 {
  79         return sprintf(buf, "%hu\n", enable_dyn_sleep);
  80 }
  81
  82 static ssize_t idle_store(struct kobject *kobj, struct kobj_attribute *attr,
  83                           const char * buf, size_t n)
  84 {
  85         unsigned short value;
  86         if (sscanf(buf, "%hu", &value) != 1 ||
  87             (value != 0 && value != 1)) {
  88                 printk(KERN_ERR "idle_sleep_store: Invalid value\n");
  89                 return -EINVAL;
  90         }
  91         enable_dyn_sleep = value;
  92         return n;
  93 }
  94
  95 static struct kobj_attribute sleep_while_idle_attr =
  96         __ATTR(sleep_while_idle, 0644, idle_show, idle_store);
  97
  98 #endif
  99
 100 static void (*omap_sram_suspend)(unsigned long r0, unsigned long r1) = NULL;
 101
 102 /*
 103  * Let's power down on idle, but only if we are really
 104  * idle, because once we start down the path of
 105  * going idle we continue to do idle even if we get
 106  * a clock tick interrupt . .
 107  */
 108 void omap1_pm_idle(void)
 109 {
 110         extern __u32 arm_idlect1_mask;
 111         __u32 use_idlect1 = arm_idlect1_mask;
 112         int do_sleep = 0;
 113
 114         local_fiq_disable();
 115
 116 #if defined(CONFIG_OMAP_MPU_TIMER) && !defined(CONFIG_OMAP_DM_TIMER)
 117 #warning Enable 32kHz OS timer in order to allow sleep states in idle
 118         use_idlect1 = use_idlect1 & ~(1 << 9);
 119 #else
 120
 121         while (enable_dyn_sleep) {
 122
 123 #ifdef CONFIG_CBUS_TAHVO_USB
 124                 extern int vbus_active;
 125                 /* Clock requirements? */
 126                 if (vbus_active)
 127                         break;
 128 #endif
 129                 do_sleep = 1;
 130                 break;
 131         }
 132
 133 #endif
 134
 135 #ifdef CONFIG_OMAP_DM_TIMER
 136         use_idlect1 = omap_dm_timer_modify_idlect_mask(use_idlect1);
 137 #endif
 138
 139         if (omap_dma_running())
 140                 use_idlect1 &= ~(1 << 6);
 141
 142         /* We should be able to remove the do_sleep variable and multiple
 143          * tests above as soon as drivers, timer and DMA code have been fixed.
 144          * Even the sleep block count should become obsolete. */
 145         if ((use_idlect1 != ~0) || !do_sleep) {
 146
 147                 __u32 saved_idlect1 = omap_readl(ARM_IDLECT1);
 148                 if (cpu_is_omap15xx())
 149                         use_idlect1 &= OMAP1510_BIG_SLEEP_REQUEST;
 150                 else
 151                         use_idlect1 &= OMAP1610_IDLECT1_SLEEP_VAL;
 152                 omap_writel(use_idlect1, ARM_IDLECT1);
 153                 __asm__ volatile ("mcr  p15, 0, r0, c7, c0, 4");
 154                 omap_writel(saved_idlect1, ARM_IDLECT1);
 155
 156                 local_fiq_enable();
 157                 return;
 158         }
 159         omap_sram_suspend(omap_readl(ARM_IDLECT1),
 160                           omap_readl(ARM_IDLECT2));
 161
 162         local_fiq_enable();
 163 }
 164
 165 /*
 166  * Configuration of the wakeup event is board specific. For the
 167  * moment we put it into this helper function. Later it may move
 168  * to board specific files.
 169  */
 170 static void omap_pm_wakeup_setup(void)
 171 {
 172         u32 level1_wake = 0;
 173         u32 level2_wake = OMAP_IRQ_BIT(INT_UART2);
 174
 175         /*
 176          * Turn off all interrupts except GPIO bank 1, L1-2nd level cascade,
 177          * and the L2 wakeup interrupts: keypad and UART2. Note that the
 178          * drivers must still separately call omap_set_gpio_wakeup() to
 179          * wake up to a GPIO interrupt.
 180          */
 181         if (cpu_is_omap7xx())
 182                 level1_wake = OMAP_IRQ_BIT(INT_7XX_GPIO_BANK1) |
 183                         OMAP_IRQ_BIT(INT_7XX_IH2_IRQ);
 184         else if (cpu_is_omap15xx())
 185                 level1_wake = OMAP_IRQ_BIT(INT_GPIO_BANK1) |
 186                         OMAP_IRQ_BIT(INT_1510_IH2_IRQ);
 187         else if (cpu_is_omap16xx())
 188                 level1_wake = OMAP_IRQ_BIT(INT_GPIO_BANK1) |
 189                         OMAP_IRQ_BIT(INT_1610_IH2_IRQ);
 190
 191         omap_writel(~level1_wake, OMAP_IH1_MIR);
 192
 193         if (cpu_is_omap7xx()) {
 194                 omap_writel(~level2_wake, OMAP_IH2_0_MIR);
 195                 omap_writel(~(OMAP_IRQ_BIT(INT_7XX_WAKE_UP_REQ) |
 196                                 OMAP_IRQ_BIT(INT_7XX_MPUIO_KEYPAD)),
 197                                 OMAP_IH2_1_MIR);
 198         } else if (cpu_is_omap15xx()) {
 199                 level2_wake |= OMAP_IRQ_BIT(INT_KEYBOARD);
 200                 omap_writel(~level2_wake,  OMAP_IH2_MIR);
 201         } else if (cpu_is_omap16xx()) {
 202                 level2_wake |= OMAP_IRQ_BIT(INT_KEYBOARD);
 203                 omap_writel(~level2_wake, OMAP_IH2_0_MIR);
 204
 205                 /* INT_1610_WAKE_UP_REQ is needed for GPIO wakeup... */
 206                 omap_writel(~OMAP_IRQ_BIT(INT_1610_WAKE_UP_REQ),
 207                             OMAP_IH2_1_MIR);
 208                 omap_writel(~0x0, OMAP_IH2_2_MIR);
 209                 omap_writel(~0x0, OMAP_IH2_3_MIR);
 210         }
 211
 212         /*  New IRQ agreement, recalculate in cascade order */
 213         omap_writel(1, OMAP_IH2_CONTROL);
 214         omap_writel(1, OMAP_IH1_CONTROL);
 215 }
 216
 217 #define EN_DSPCK        13      /* ARM_CKCTL */
 218 #define EN_APICK        6       /* ARM_IDLECT2 */
 219 #define DSP_EN          1       /* ARM_RSTCT1 */
 220
 221 void omap1_pm_suspend(void)
 222 {
 223         unsigned long arg0 = 0, arg1 = 0;
 224
 225         printk(KERN_INFO "PM: OMAP%x is trying to enter deep sleep...\n",
 226                 omap_rev());
 227
 228         omap_serial_wake_trigger(1);
 229
 230         if (!cpu_is_omap15xx())
 231                 omap_writew(0xffff, ULPD_SOFT_DISABLE_REQ_REG);
 232
 233         /*
 234          * Step 1: turn off interrupts (FIXME: NOTE: already disabled)
 235          */
 236
 237         local_irq_disable();
 238         local_fiq_disable();
 239
 240         /*
 241          * Step 2: save registers
 242          *
 243          * The omap is a strange/beautiful device. The caches, memory
 244          * and register state are preserved across power saves.
 245          * We have to save and restore very little register state to
 246          * idle the omap.
 247          *
 248          * Save interrupt, MPUI, ARM and UPLD control registers.
 249          */
 250
 251         if (cpu_is_omap7xx()) {
 252                 MPUI7XX_SAVE(OMAP_IH1_MIR);
 253                 MPUI7XX_SAVE(OMAP_IH2_0_MIR);
 254                 MPUI7XX_SAVE(OMAP_IH2_1_MIR);
 255                 MPUI7XX_SAVE(MPUI_CTRL);
 256                 MPUI7XX_SAVE(MPUI_DSP_BOOT_CONFIG);
 257                 MPUI7XX_SAVE(MPUI_DSP_API_CONFIG);
 258                 MPUI7XX_SAVE(EMIFS_CONFIG);
 259                 MPUI7XX_SAVE(EMIFF_SDRAM_CONFIG);
 260
 261         } else if (cpu_is_omap15xx()) {
 262                 MPUI1510_SAVE(OMAP_IH1_MIR);
 263                 MPUI1510_SAVE(OMAP_IH2_MIR);
 264                 MPUI1510_SAVE(MPUI_CTRL);
 265                 MPUI1510_SAVE(MPUI_DSP_BOOT_CONFIG);
 266                 MPUI1510_SAVE(MPUI_DSP_API_CONFIG);
 267                 MPUI1510_SAVE(EMIFS_CONFIG);
 268                 MPUI1510_SAVE(EMIFF_SDRAM_CONFIG);
 269         } else if (cpu_is_omap16xx()) {
 270                 MPUI1610_SAVE(OMAP_IH1_MIR);
 271                 MPUI1610_SAVE(OMAP_IH2_0_MIR);
 272                 MPUI1610_SAVE(OMAP_IH2_1_MIR);
 273                 MPUI1610_SAVE(OMAP_IH2_2_MIR);
 274                 MPUI1610_SAVE(OMAP_IH2_3_MIR);
 275                 MPUI1610_SAVE(MPUI_CTRL);
 276                 MPUI1610_SAVE(MPUI_DSP_BOOT_CONFIG);
 277                 MPUI1610_SAVE(MPUI_DSP_API_CONFIG);
 278                 MPUI1610_SAVE(EMIFS_CONFIG);
 279                 MPUI1610_SAVE(EMIFF_SDRAM_CONFIG);
 280         }
 281
 282         ARM_SAVE(ARM_CKCTL);
 283         ARM_SAVE(ARM_IDLECT1);
 284         ARM_SAVE(ARM_IDLECT2);
 285         if (!(cpu_is_omap15xx()))
 286                 ARM_SAVE(ARM_IDLECT3);
 287         ARM_SAVE(ARM_EWUPCT);
 288         ARM_SAVE(ARM_RSTCT1);
 289         ARM_SAVE(ARM_RSTCT2);
 290         ARM_SAVE(ARM_SYSST);
 291         ULPD_SAVE(ULPD_CLOCK_CTRL);
 292         ULPD_SAVE(ULPD_STATUS_REQ);
 293
 294         /* (Step 3 removed - we now allow deep sleep by default) */
 295
 296         /*
 297          * Step 4: OMAP DSP Shutdown
 298          */
 299
 300         /* stop DSP */
 301         omap_writew(omap_readw(ARM_RSTCT1) & ~(1 << DSP_EN), ARM_RSTCT1);
 302
 303                 /* shut down dsp_ck */
 304         if (!cpu_is_omap7xx())
 305                 omap_writew(omap_readw(ARM_CKCTL) & ~(1 << EN_DSPCK), ARM_CKCTL);
 306
 307         /* temporarily enabling api_ck to access DSP registers */
 308         omap_writew(omap_readw(ARM_IDLECT2) | 1 << EN_APICK, ARM_IDLECT2);
 309
 310         /* save DSP registers */
 311         DSP_SAVE(DSP_IDLECT2);
 312
 313         /* Stop all DSP domain clocks */
 314         __raw_writew(0, DSP_IDLECT2);
 315
 316         /*
 317          * Step 5: Wakeup Event Setup
 318          */
 319
 320         omap_pm_wakeup_setup();
 321
 322         /*
 323          * Step 6: ARM and Traffic controller shutdown
 324          */
 325
 326         /* disable ARM watchdog */
 327         omap_writel(0x00F5, OMAP_WDT_TIMER_MODE);
 328         omap_writel(0x00A0, OMAP_WDT_TIMER_MODE);
 329
 330         /*
 331          * Step 6b: ARM and Traffic controller shutdown
 332          *
 333          * Step 6 continues here. Prepare jump to power management
 334          * assembly code in internal SRAM.
 335          *
 336          * Since the omap_cpu_suspend routine has been copied to
 337          * SRAM, we'll do an indirect procedure call to it and pass the
 338          * contents of arm_idlect1 and arm_idlect2 so it can restore
 339          * them when it wakes up and it will return.
 340          */
 341
 342         arg0 = arm_sleep_save[ARM_SLEEP_SAVE_ARM_IDLECT1];
 343         arg1 = arm_sleep_save[ARM_SLEEP_SAVE_ARM_IDLECT2];
 344
 345         /*
 346          * Step 6c: ARM and Traffic controller shutdown
 347          *
 348          * Jump to assembly code. The processor will stay there
 349          * until wake up.
 350          */
 351         omap_sram_suspend(arg0, arg1);
 352
 353         /*
 354          * If we are here, processor is woken up!
 355          */
 356
 357         /*
 358          * Restore DSP clocks
 359          */
 360
 361         /* again temporarily enabling api_ck to access DSP registers */
 362         omap_writew(omap_readw(ARM_IDLECT2) | 1 << EN_APICK, ARM_IDLECT2);
 363
 364         /* Restore DSP domain clocks */
 365         DSP_RESTORE(DSP_IDLECT2);
 366
 367         /*
 368          * Restore ARM state, except ARM_IDLECT1/2 which omap_cpu_suspend did
 369          */
 370
 371         if (!(cpu_is_omap15xx()))
 372                 ARM_RESTORE(ARM_IDLECT3);
 373         ARM_RESTORE(ARM_CKCTL);
 374         ARM_RESTORE(ARM_EWUPCT);
 375         ARM_RESTORE(ARM_RSTCT1);
 376         ARM_RESTORE(ARM_RSTCT2);
 377         ARM_RESTORE(ARM_SYSST);
 378         ULPD_RESTORE(ULPD_CLOCK_CTRL);
 379         ULPD_RESTORE(ULPD_STATUS_REQ);
 380
 381         if (cpu_is_omap7xx()) {
 382                 MPUI7XX_RESTORE(EMIFS_CONFIG);
 383                 MPUI7XX_RESTORE(EMIFF_SDRAM_CONFIG);
 384                 MPUI7XX_RESTORE(OMAP_IH1_MIR);
 385                 MPUI7XX_RESTORE(OMAP_IH2_0_MIR);
 386                 MPUI7XX_RESTORE(OMAP_IH2_1_MIR);
 387         } else if (cpu_is_omap15xx()) {
 388                 MPUI1510_RESTORE(MPUI_CTRL);
 389                 MPUI1510_RESTORE(MPUI_DSP_BOOT_CONFIG);
 390                 MPUI1510_RESTORE(MPUI_DSP_API_CONFIG);
 391                 MPUI1510_RESTORE(EMIFS_CONFIG);
 392                 MPUI1510_RESTORE(EMIFF_SDRAM_CONFIG);
 393                 MPUI1510_RESTORE(OMAP_IH1_MIR);
 394                 MPUI1510_RESTORE(OMAP_IH2_MIR);
 395         } else if (cpu_is_omap16xx()) {
 396                 MPUI1610_RESTORE(MPUI_CTRL);
 397                 MPUI1610_RESTORE(MPUI_DSP_BOOT_CONFIG);
 398                 MPUI1610_RESTORE(MPUI_DSP_API_CONFIG);
 399                 MPUI1610_RESTORE(EMIFS_CONFIG);
 400                 MPUI1610_RESTORE(EMIFF_SDRAM_CONFIG);
 401
 402                 MPUI1610_RESTORE(OMAP_IH1_MIR);
 403                 MPUI1610_RESTORE(OMAP_IH2_0_MIR);
 404                 MPUI1610_RESTORE(OMAP_IH2_1_MIR);
 405                 MPUI1610_RESTORE(OMAP_IH2_2_MIR);
 406                 MPUI1610_RESTORE(OMAP_IH2_3_MIR);
 407         }
 408
 409         if (!cpu_is_omap15xx())
 410                 omap_writew(0, ULPD_SOFT_DISABLE_REQ_REG);
 411
 412         /*
 413          * Re-enable interrupts
 414          */
 415
 416         local_irq_enable();
 417         local_fiq_enable();
 418
 419         omap_serial_wake_trigger(0);
 420
 421         printk(KERN_INFO "PM: OMAP%x is re-starting from deep sleep...\n",
 422                 omap_rev());
 423 }
 424
 425 #if defined(DEBUG) && defined(CONFIG_PROC_FS)
 426 static int g_read_completed;
 427
 428 /*
 429  * Read system PM registers for debugging
 430  */
 431 static int omap_pm_read_proc(
 432         char *page_buffer,
 433         char **my_first_byte,
 434         off_t virtual_start,
 435         int length,
 436         int *eof,
 437         void *data)
 438 {
 439         int my_buffer_offset = 0;
 440         char * const my_base = page_buffer;
 441
 442         ARM_SAVE(ARM_CKCTL);
 443         ARM_SAVE(ARM_IDLECT1);
 444         ARM_SAVE(ARM_IDLECT2);
 445         if (!(cpu_is_omap15xx()))
 446                 ARM_SAVE(ARM_IDLECT3);
 447         ARM_SAVE(ARM_EWUPCT);
 448         ARM_SAVE(ARM_RSTCT1);
 449         ARM_SAVE(ARM_RSTCT2);
 450         ARM_SAVE(ARM_SYSST);
 451
 452         ULPD_SAVE(ULPD_IT_STATUS);
 453         ULPD_SAVE(ULPD_CLOCK_CTRL);
 454         ULPD_SAVE(ULPD_SOFT_REQ);
 455         ULPD_SAVE(ULPD_STATUS_REQ);
 456         ULPD_SAVE(ULPD_DPLL_CTRL);
 457         ULPD_SAVE(ULPD_POWER_CTRL);
 458
 459         if (cpu_is_omap7xx()) {
 460                 MPUI7XX_SAVE(MPUI_CTRL);
 461                 MPUI7XX_SAVE(MPUI_DSP_STATUS);
 462                 MPUI7XX_SAVE(MPUI_DSP_BOOT_CONFIG);
 463                 MPUI7XX_SAVE(MPUI_DSP_API_CONFIG);
 464                 MPUI7XX_SAVE(EMIFF_SDRAM_CONFIG);
 465                 MPUI7XX_SAVE(EMIFS_CONFIG);
 466         } else if (cpu_is_omap15xx()) {
 467                 MPUI1510_SAVE(MPUI_CTRL);
 468                 MPUI1510_SAVE(MPUI_DSP_STATUS);
 469                 MPUI1510_SAVE(MPUI_DSP_BOOT_CONFIG);
 470                 MPUI1510_SAVE(MPUI_DSP_API_CONFIG);
 471                 MPUI1510_SAVE(EMIFF_SDRAM_CONFIG);
 472                 MPUI1510_SAVE(EMIFS_CONFIG);
 473         } else if (cpu_is_omap16xx()) {
 474                 MPUI1610_SAVE(MPUI_CTRL);
 475                 MPUI1610_SAVE(MPUI_DSP_STATUS);
 476                 MPUI1610_SAVE(MPUI_DSP_BOOT_CONFIG);
 477                 MPUI1610_SAVE(MPUI_DSP_API_CONFIG);
 478                 MPUI1610_SAVE(EMIFF_SDRAM_CONFIG);
 479                 MPUI1610_SAVE(EMIFS_CONFIG);
 480         }
 481
 482         if (virtual_start == 0) {
 483                 g_read_completed = 0;
 484
 485                 my_buffer_offset += sprintf(my_base + my_buffer_offset,
 486                    "ARM_CKCTL_REG:            0x%-8x     \n"
 487                    "ARM_IDLECT1_REG:          0x%-8x     \n"
 488                    "ARM_IDLECT2_REG:          0x%-8x     \n"
 489                    "ARM_IDLECT3_REG:          0x%-8x     \n"
 490                    "ARM_EWUPCT_REG:           0x%-8x     \n"
 491                    "ARM_RSTCT1_REG:           0x%-8x     \n"
 492                    "ARM_RSTCT2_REG:           0x%-8x     \n"
 493                    "ARM_SYSST_REG:            0x%-8x     \n"
 494                    "ULPD_IT_STATUS_REG:       0x%-4x     \n"
 495                    "ULPD_CLOCK_CTRL_REG:      0x%-4x     \n"
 496                    "ULPD_SOFT_REQ_REG:        0x%-4x     \n"
 497                    "ULPD_DPLL_CTRL_REG:       0x%-4x     \n"
 498                    "ULPD_STATUS_REQ_REG:      0x%-4x     \n"
 499                    "ULPD_POWER_CTRL_REG:      0x%-4x     \n",
 500                    ARM_SHOW(ARM_CKCTL),
 501                    ARM_SHOW(ARM_IDLECT1),
 502                    ARM_SHOW(ARM_IDLECT2),
 503                    ARM_SHOW(ARM_IDLECT3),
 504                    ARM_SHOW(ARM_EWUPCT),
 505                    ARM_SHOW(ARM_RSTCT1),
 506                    ARM_SHOW(ARM_RSTCT2),
 507                    ARM_SHOW(ARM_SYSST),
 508                    ULPD_SHOW(ULPD_IT_STATUS),
 509                    ULPD_SHOW(ULPD_CLOCK_CTRL),
 510                    ULPD_SHOW(ULPD_SOFT_REQ),
 511                    ULPD_SHOW(ULPD_DPLL_CTRL),
 512                    ULPD_SHOW(ULPD_STATUS_REQ),
 513                    ULPD_SHOW(ULPD_POWER_CTRL));
 514
 515                 if (cpu_is_omap7xx()) {
 516                         my_buffer_offset += sprintf(my_base + my_buffer_offset,
 517                            "MPUI7XX_CTRL_REG         0x%-8x \n"
 518                            "MPUI7XX_DSP_STATUS_REG:      0x%-8x \n"
 519                            "MPUI7XX_DSP_BOOT_CONFIG_REG: 0x%-8x \n"
 520                            "MPUI7XX_DSP_API_CONFIG_REG:  0x%-8x \n"
 521                            "MPUI7XX_SDRAM_CONFIG_REG:    0x%-8x \n"
 522                            "MPUI7XX_EMIFS_CONFIG_REG:    0x%-8x \n",
 523                            MPUI7XX_SHOW(MPUI_CTRL),
 524                            MPUI7XX_SHOW(MPUI_DSP_STATUS),
 525                            MPUI7XX_SHOW(MPUI_DSP_BOOT_CONFIG),
 526                            MPUI7XX_SHOW(MPUI_DSP_API_CONFIG),
 527                            MPUI7XX_SHOW(EMIFF_SDRAM_CONFIG),
 528                            MPUI7XX_SHOW(EMIFS_CONFIG));
 529                 } else if (cpu_is_omap15xx()) {
 530                         my_buffer_offset += sprintf(my_base + my_buffer_offset,
 531                            "MPUI1510_CTRL_REG             0x%-8x \n"
 532                            "MPUI1510_DSP_STATUS_REG:      0x%-8x \n"
 533                            "MPUI1510_DSP_BOOT_CONFIG_REG: 0x%-8x \n"
 534                            "MPUI1510_DSP_API_CONFIG_REG:  0x%-8x \n"
 535                            "MPUI1510_SDRAM_CONFIG_REG:    0x%-8x \n"
 536                            "MPUI1510_EMIFS_CONFIG_REG:    0x%-8x \n",
 537                            MPUI1510_SHOW(MPUI_CTRL),
 538                            MPUI1510_SHOW(MPUI_DSP_STATUS),
 539                            MPUI1510_SHOW(MPUI_DSP_BOOT_CONFIG),
 540                            MPUI1510_SHOW(MPUI_DSP_API_CONFIG),
 541                            MPUI1510_SHOW(EMIFF_SDRAM_CONFIG),
 542                            MPUI1510_SHOW(EMIFS_CONFIG));
 543                 } else if (cpu_is_omap16xx()) {
 544                         my_buffer_offset += sprintf(my_base + my_buffer_offset,
 545                            "MPUI1610_CTRL_REG             0x%-8x \n"
 546                            "MPUI1610_DSP_STATUS_REG:      0x%-8x \n"
 547                            "MPUI1610_DSP_BOOT_CONFIG_REG: 0x%-8x \n"
 548                            "MPUI1610_DSP_API_CONFIG_REG:  0x%-8x \n"
 549                            "MPUI1610_SDRAM_CONFIG_REG:    0x%-8x \n"
 550                            "MPUI1610_EMIFS_CONFIG_REG:    0x%-8x \n",
 551                            MPUI1610_SHOW(MPUI_CTRL),
 552                            MPUI1610_SHOW(MPUI_DSP_STATUS),
 553                            MPUI1610_SHOW(MPUI_DSP_BOOT_CONFIG),
 554                            MPUI1610_SHOW(MPUI_DSP_API_CONFIG),
 555                            MPUI1610_SHOW(EMIFF_SDRAM_CONFIG),
 556                            MPUI1610_SHOW(EMIFS_CONFIG));
 557                 }
 558
 559                 g_read_completed++;
 560         } else if (g_read_completed >= 1) {
 561                  *eof = 1;
 562                  return 0;
 563         }
 564         g_read_completed++;
 565
 566         *my_first_byte = page_buffer;
 567         return  my_buffer_offset;
 568 }
 569
 570 static void omap_pm_init_proc(void)
 571 {
 572         /* XXX Appears to leak memory */
 573         create_proc_read_entry("driver/omap_pm",
 574                                S_IWUSR | S_IRUGO, NULL,
 575                                omap_pm_read_proc, NULL);
 576 }
 577
 578 #endif /* DEBUG && CONFIG_PROC_FS */
 579
 580 /*
 581  *      omap_pm_prepare - Do preliminary suspend work.
 582  *
 583  */
 584 static int omap_pm_prepare(void)
 585 {
 586         /* We cannot sleep in idle until we have resumed */
 587         disable_hlt();
 588
 589         return 0;
 590 }
 591
 592
 593 /*
 594  *      omap_pm_enter - Actually enter a sleep state.
 595  *      @state:         State we're entering.
 596  *
 597  */
 598
 599 static int omap_pm_enter(suspend_state_t state)
 600 {
 601         switch (state)
 602         {
 603         case PM_SUSPEND_STANDBY:
 604         case PM_SUSPEND_MEM:
 605                 omap1_pm_suspend();
 606                 break;
 607         default:
 608                 return -EINVAL;
 609         }
 610
 611         return 0;
 612 }
 613
 614
 615 /**
 616  *      omap_pm_finish - Finish up suspend sequence.
 617  *
 618  *      This is called after we wake back up (or if entering the sleep state
 619  *      failed).
 620  */
 621
 622 static void omap_pm_finish(void)
 623 {
 624         enable_hlt();
 625 }
 626
 627
 628 static irqreturn_t omap_wakeup_interrupt(int irq, void *dev)
 629 {
 630         return IRQ_HANDLED;
 631 }
 632
 633 static struct irqaction omap_wakeup_irq = {
 634         .name           = "peripheral wakeup",
 635         .flags          = IRQF_DISABLED,
 636         .handler        = omap_wakeup_interrupt
 637 };
 638
 639
 640
 641 static const struct platform_suspend_ops omap_pm_ops = {
 642         .prepare        = omap_pm_prepare,
 643         .enter          = omap_pm_enter,
 644         .finish         = omap_pm_finish,
 645         .valid          = suspend_valid_only_mem,
 646 };
 647
 648 static int __init omap_pm_init(void)
 649 {
 650
 651 #ifdef CONFIG_OMAP_32K_TIMER
 652         int error;
 653 #endif
 654
 655         if (!cpu_class_is_omap1())
 656                 return -ENODEV;
 657
 658         printk("Power Management for TI OMAP.\n");
 659
 660         /*
 661          * We copy the assembler sleep/wakeup routines to SRAM.
 662          * These routines need to be in SRAM as that's the only
 663          * memory the MPU can see when it wakes up.
 664          */
 665         if (cpu_is_omap7xx()) {
 666                 omap_sram_suspend = omap_sram_push(omap7xx_cpu_suspend,
 667                                                    omap7xx_cpu_suspend_sz);
 668         } else if (cpu_is_omap15xx()) {
 669                 omap_sram_suspend = omap_sram_push(omap1510_cpu_suspend,
 670                                                    omap1510_cpu_suspend_sz);
 671         } else if (cpu_is_omap16xx()) {
 672                 omap_sram_suspend = omap_sram_push(omap1610_cpu_suspend,
 673                                                    omap1610_cpu_suspend_sz);
 674         }
 675
 676         if (omap_sram_suspend == NULL) {
 677                 printk(KERN_ERR "PM not initialized: Missing SRAM support\n");
 678                 return -ENODEV;
 679         }
 680
 681         arm_pm_idle = omap1_pm_idle;
 682
 683         if (cpu_is_omap7xx())
 684                 setup_irq(INT_7XX_WAKE_UP_REQ, &omap_wakeup_irq);
 685         else if (cpu_is_omap16xx())
 686                 setup_irq(INT_1610_WAKE_UP_REQ, &omap_wakeup_irq);
 687
 688         /* Program new power ramp-up time
 689          * (0 for most boards since we don't lower voltage when in deep sleep)
 690          */
 691         omap_writew(ULPD_SETUP_ANALOG_CELL_3_VAL, ULPD_SETUP_ANALOG_CELL_3);
 692
 693         /* Setup ULPD POWER_CTRL_REG - enter deep sleep whenever possible */
 694         omap_writew(ULPD_POWER_CTRL_REG_VAL, ULPD_POWER_CTRL);
 695
 696         /* Configure IDLECT3 */
 697         if (cpu_is_omap7xx())
 698                 omap_writel(OMAP7XX_IDLECT3_VAL, OMAP7XX_IDLECT3);
 699         else if (cpu_is_omap16xx())
 700                 omap_writel(OMAP1610_IDLECT3_VAL, OMAP1610_IDLECT3);
 701
 702         suspend_set_ops(&omap_pm_ops);
 703
 704 #if defined(DEBUG) && defined(CONFIG_PROC_FS)
 705         omap_pm_init_proc();
 706 #endif
 707
 708 #ifdef CONFIG_OMAP_32K_TIMER
 709         error = sysfs_create_file(power_kobj, &sleep_while_idle_attr.attr);
 710         if (error)
 711                 printk(KERN_ERR "sysfs_create_file failed: %d\n", error);
 712 #endif
 713
 714         if (cpu_is_omap16xx()) {
 715                 /* configure LOW_PWR pin */
 716                 omap_cfg_reg(T20_1610_LOW_PWR);
 717         }
 718
 719         return 0;
 720 }
 721 __initcall(omap_pm_init);