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   1 /*
   2  * linux/arch/arm/plat-omap/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/pm.h>
  39 #include <linux/sched.h>
  40 #include <linux/proc_fs.h>
  41 #include <linux/pm.h>
  42 #include <linux/interrupt.h>
  43
  44 #include <asm/io.h>
  45 #include <asm/irq.h>
  46 #include <asm/mach/time.h>
  47 #include <asm/mach/irq.h>
  48
  49 #include <asm/mach-types.h>
  50 #include <asm/arch/irqs.h>
  51 #include <asm/arch/tc.h>
  52 #include <asm/arch/pm.h>
  53 #include <asm/arch/mux.h>
  54 #include <asm/arch/tps65010.h>
  55 #include <asm/arch/dsp_common.h>
  56
  57 #include <asm/arch/clock.h>
  58 #include <asm/arch/sram.h>
  59
  60 static unsigned int arm_sleep_save[ARM_SLEEP_SAVE_SIZE];
  61 static unsigned short ulpd_sleep_save[ULPD_SLEEP_SAVE_SIZE];
  62 static unsigned int mpui730_sleep_save[MPUI730_SLEEP_SAVE_SIZE];
  63 static unsigned int mpui1510_sleep_save[MPUI1510_SLEEP_SAVE_SIZE];
  64 static unsigned int mpui1610_sleep_save[MPUI1610_SLEEP_SAVE_SIZE];
  65
  66 static void (*omap_sram_idle)(void) = NULL;
  67 static void (*omap_sram_suspend)(unsigned long r0, unsigned long r1) = NULL;
  68
  69 /*
  70  * Let's power down on idle, but only if we are really
  71  * idle, because once we start down the path of
  72  * going idle we continue to do idle even if we get
  73  * a clock tick interrupt . .
  74  */
  75 void omap_pm_idle(void)
  76 {
  77         unsigned int mask32 = 0;
  78
  79         /*
  80          * If the DSP is being used let's just idle the CPU, the overhead
  81          * to wake up from Big Sleep is big, milliseconds versus micro
  82          * seconds for wait for interrupt.
  83          */
  84
  85         local_irq_disable();
  86         local_fiq_disable();
  87         if (need_resched()) {
  88                 local_fiq_enable();
  89                 local_irq_enable();
  90                 return;
  91         }
  92         mask32 = omap_readl(ARM_SYSST);
  93
  94         /*
  95          * Prevent the ULPD from entering low power state by setting
  96          * POWER_CTRL_REG:4 = 0
  97          */
  98         omap_writew(omap_readw(ULPD_POWER_CTRL) &
  99                     ~ULPD_DEEP_SLEEP_TRANSITION_EN, ULPD_POWER_CTRL);
 100
 101         /*
 102          * Since an interrupt may set up a timer, we don't want to
 103          * reprogram the hardware timer with interrupts enabled.
 104          * Re-enable interrupts only after returning from idle.
 105          */
 106         timer_dyn_reprogram();
 107
 108         if ((mask32 & DSP_IDLE) == 0) {
 109                 __asm__ volatile ("mcr  p15, 0, r0, c7, c0, 4");
 110         } else
 111                 omap_sram_idle();
 112
 113         local_fiq_enable();
 114         local_irq_enable();
 115 }
 116
 117 /*
 118  * Configuration of the wakeup event is board specific. For the
 119  * moment we put it into this helper function. Later it may move
 120  * to board specific files.
 121  */
 122 static void omap_pm_wakeup_setup(void)
 123 {
 124         u32 level1_wake = 0;
 125         u32 level2_wake = OMAP_IRQ_BIT(INT_UART2);
 126
 127         /*
 128          * Turn off all interrupts except GPIO bank 1, L1-2nd level cascade,
 129          * and the L2 wakeup interrupts: keypad and UART2. Note that the
 130          * drivers must still separately call omap_set_gpio_wakeup() to
 131          * wake up to a GPIO interrupt.
 132          */
 133         if (cpu_is_omap730())
 134                 level1_wake = OMAP_IRQ_BIT(INT_730_GPIO_BANK1) |
 135                         OMAP_IRQ_BIT(INT_730_IH2_IRQ);
 136         else if (cpu_is_omap1510())
 137                 level1_wake = OMAP_IRQ_BIT(INT_GPIO_BANK1) |
 138                         OMAP_IRQ_BIT(INT_1510_IH2_IRQ);
 139         else if (cpu_is_omap16xx())
 140                 level1_wake = OMAP_IRQ_BIT(INT_GPIO_BANK1) |
 141                         OMAP_IRQ_BIT(INT_1610_IH2_IRQ);
 142
 143         omap_writel(~level1_wake, OMAP_IH1_MIR);
 144
 145         if (cpu_is_omap730()) {
 146                 omap_writel(~level2_wake, OMAP_IH2_0_MIR);
 147                 omap_writel(~(OMAP_IRQ_BIT(INT_730_WAKE_UP_REQ) | OMAP_IRQ_BIT(INT_730_MPUIO_KEYPAD)), OMAP_IH2_1_MIR);
 148         } else if (cpu_is_omap1510()) {
 149                 level2_wake |= OMAP_IRQ_BIT(INT_KEYBOARD);
 150                 omap_writel(~level2_wake,  OMAP_IH2_MIR);
 151         } else if (cpu_is_omap16xx()) {
 152                 level2_wake |= OMAP_IRQ_BIT(INT_KEYBOARD);
 153                 omap_writel(~level2_wake, OMAP_IH2_0_MIR);
 154
 155                 /* INT_1610_WAKE_UP_REQ is needed for GPIO wakeup... */
 156                 omap_writel(~OMAP_IRQ_BIT(INT_1610_WAKE_UP_REQ), OMAP_IH2_1_MIR);
 157                 omap_writel(~0x0, OMAP_IH2_2_MIR);
 158                 omap_writel(~0x0, OMAP_IH2_3_MIR);
 159         }
 160
 161         /*  New IRQ agreement, recalculate in cascade order */
 162         omap_writel(1, OMAP_IH2_CONTROL);
 163         omap_writel(1, OMAP_IH1_CONTROL);
 164 }
 165
 166 void omap_pm_suspend(void)
 167 {
 168         unsigned long arg0 = 0, arg1 = 0;
 169
 170         printk("PM: OMAP%x is trying to enter deep sleep...\n", system_rev);
 171
 172         omap_serial_wake_trigger(1);
 173
 174         if (machine_is_omap_osk()) {
 175                 /* Stop LED1 (D9) blink */
 176                 tps65010_set_led(LED1, OFF);
 177         }
 178
 179         omap_writew(0xffff, ULPD_SOFT_DISABLE_REQ_REG);
 180
 181         /*
 182          * Step 1: turn off interrupts (FIXME: NOTE: already disabled)
 183          */
 184
 185         local_irq_disable();
 186         local_fiq_disable();
 187
 188         /*
 189          * Step 2: save registers
 190          *
 191          * The omap is a strange/beautiful device. The caches, memory
 192          * and register state are preserved across power saves.
 193          * We have to save and restore very little register state to
 194          * idle the omap.
 195          *
 196          * Save interrupt, MPUI, ARM and UPLD control registers.
 197          */
 198
 199         if (cpu_is_omap730()) {
 200                 MPUI730_SAVE(OMAP_IH1_MIR);
 201                 MPUI730_SAVE(OMAP_IH2_0_MIR);
 202                 MPUI730_SAVE(OMAP_IH2_1_MIR);
 203                 MPUI730_SAVE(MPUI_CTRL);
 204                 MPUI730_SAVE(MPUI_DSP_BOOT_CONFIG);
 205                 MPUI730_SAVE(MPUI_DSP_API_CONFIG);
 206                 MPUI730_SAVE(EMIFS_CONFIG);
 207                 MPUI730_SAVE(EMIFF_SDRAM_CONFIG);
 208
 209         } else if (cpu_is_omap1510()) {
 210                 MPUI1510_SAVE(OMAP_IH1_MIR);
 211                 MPUI1510_SAVE(OMAP_IH2_MIR);
 212                 MPUI1510_SAVE(MPUI_CTRL);
 213                 MPUI1510_SAVE(MPUI_DSP_BOOT_CONFIG);
 214                 MPUI1510_SAVE(MPUI_DSP_API_CONFIG);
 215                 MPUI1510_SAVE(EMIFS_CONFIG);
 216                 MPUI1510_SAVE(EMIFF_SDRAM_CONFIG);
 217         } else if (cpu_is_omap16xx()) {
 218                 MPUI1610_SAVE(OMAP_IH1_MIR);
 219                 MPUI1610_SAVE(OMAP_IH2_0_MIR);
 220                 MPUI1610_SAVE(OMAP_IH2_1_MIR);
 221                 MPUI1610_SAVE(OMAP_IH2_2_MIR);
 222                 MPUI1610_SAVE(OMAP_IH2_3_MIR);
 223                 MPUI1610_SAVE(MPUI_CTRL);
 224                 MPUI1610_SAVE(MPUI_DSP_BOOT_CONFIG);
 225                 MPUI1610_SAVE(MPUI_DSP_API_CONFIG);
 226                 MPUI1610_SAVE(EMIFS_CONFIG);
 227                 MPUI1610_SAVE(EMIFF_SDRAM_CONFIG);
 228         }
 229
 230         ARM_SAVE(ARM_CKCTL);
 231         ARM_SAVE(ARM_IDLECT1);
 232         ARM_SAVE(ARM_IDLECT2);
 233         if (!(cpu_is_omap1510()))
 234                 ARM_SAVE(ARM_IDLECT3);
 235         ARM_SAVE(ARM_EWUPCT);
 236         ARM_SAVE(ARM_RSTCT1);
 237         ARM_SAVE(ARM_RSTCT2);
 238         ARM_SAVE(ARM_SYSST);
 239         ULPD_SAVE(ULPD_CLOCK_CTRL);
 240         ULPD_SAVE(ULPD_STATUS_REQ);
 241
 242         /* (Step 3 removed - we now allow deep sleep by default) */
 243
 244         /*
 245          * Step 4: OMAP DSP Shutdown
 246          */
 247
 248
 249         /*
 250          * Step 5: Wakeup Event Setup
 251          */
 252
 253         omap_pm_wakeup_setup();
 254
 255         /*
 256          * Step 6: ARM and Traffic controller shutdown
 257          */
 258
 259         /* disable ARM watchdog */
 260         omap_writel(0x00F5, OMAP_WDT_TIMER_MODE);
 261         omap_writel(0x00A0, OMAP_WDT_TIMER_MODE);
 262
 263         /*
 264          * Step 6b: ARM and Traffic controller shutdown
 265          *
 266          * Step 6 continues here. Prepare jump to power management
 267          * assembly code in internal SRAM.
 268          *
 269          * Since the omap_cpu_suspend routine has been copied to
 270          * SRAM, we'll do an indirect procedure call to it and pass the
 271          * contents of arm_idlect1 and arm_idlect2 so it can restore
 272          * them when it wakes up and it will return.
 273          */
 274
 275         arg0 = arm_sleep_save[ARM_SLEEP_SAVE_ARM_IDLECT1];
 276         arg1 = arm_sleep_save[ARM_SLEEP_SAVE_ARM_IDLECT2];
 277
 278         /*
 279          * Step 6c: ARM and Traffic controller shutdown
 280          *
 281          * Jump to assembly code. The processor will stay there
 282          * until wake up.
 283          */
 284         omap_sram_suspend(arg0, arg1);
 285
 286         /*
 287          * If we are here, processor is woken up!
 288          */
 289
 290         /*
 291          * Restore ARM state, except ARM_IDLECT1/2 which omap_cpu_suspend did
 292          */
 293
 294         if (!(cpu_is_omap1510()))
 295                 ARM_RESTORE(ARM_IDLECT3);
 296         ARM_RESTORE(ARM_CKCTL);
 297         ARM_RESTORE(ARM_EWUPCT);
 298         ARM_RESTORE(ARM_RSTCT1);
 299         ARM_RESTORE(ARM_RSTCT2);
 300         ARM_RESTORE(ARM_SYSST);
 301         ULPD_RESTORE(ULPD_CLOCK_CTRL);
 302         ULPD_RESTORE(ULPD_STATUS_REQ);
 303
 304         if (cpu_is_omap730()) {
 305                 MPUI730_RESTORE(EMIFS_CONFIG);
 306                 MPUI730_RESTORE(EMIFF_SDRAM_CONFIG);
 307                 MPUI730_RESTORE(OMAP_IH1_MIR);
 308                 MPUI730_RESTORE(OMAP_IH2_0_MIR);
 309                 MPUI730_RESTORE(OMAP_IH2_1_MIR);
 310         } else if (cpu_is_omap1510()) {
 311                 MPUI1510_RESTORE(MPUI_CTRL);
 312                 MPUI1510_RESTORE(MPUI_DSP_BOOT_CONFIG);
 313                 MPUI1510_RESTORE(MPUI_DSP_API_CONFIG);
 314                 MPUI1510_RESTORE(EMIFS_CONFIG);
 315                 MPUI1510_RESTORE(EMIFF_SDRAM_CONFIG);
 316                 MPUI1510_RESTORE(OMAP_IH1_MIR);
 317                 MPUI1510_RESTORE(OMAP_IH2_MIR);
 318         } else if (cpu_is_omap16xx()) {
 319                 MPUI1610_RESTORE(MPUI_CTRL);
 320                 MPUI1610_RESTORE(MPUI_DSP_BOOT_CONFIG);
 321                 MPUI1610_RESTORE(MPUI_DSP_API_CONFIG);
 322                 MPUI1610_RESTORE(EMIFS_CONFIG);
 323                 MPUI1610_RESTORE(EMIFF_SDRAM_CONFIG);
 324
 325                 MPUI1610_RESTORE(OMAP_IH1_MIR);
 326                 MPUI1610_RESTORE(OMAP_IH2_0_MIR);
 327                 MPUI1610_RESTORE(OMAP_IH2_1_MIR);
 328                 MPUI1610_RESTORE(OMAP_IH2_2_MIR);
 329                 MPUI1610_RESTORE(OMAP_IH2_3_MIR);
 330         }
 331
 332         omap_writew(0, ULPD_SOFT_DISABLE_REQ_REG);
 333
 334         /*
 335          * Reenable interrupts
 336          */
 337
 338         local_irq_enable();
 339         local_fiq_enable();
 340
 341         omap_serial_wake_trigger(0);
 342
 343         printk("PM: OMAP%x is re-starting from deep sleep...\n", system_rev);
 344
 345         if (machine_is_omap_osk()) {
 346                 /* Let LED1 (D9) blink again */
 347                 tps65010_set_led(LED1, BLINK);
 348         }
 349 }
 350
 351 #if defined(DEBUG) && defined(CONFIG_PROC_FS)
 352 static int g_read_completed;
 353
 354 /*
 355  * Read system PM registers for debugging
 356  */
 357 static int omap_pm_read_proc(
 358         char *page_buffer,
 359         char **my_first_byte,
 360         off_t virtual_start,
 361         int length,
 362         int *eof,
 363         void *data)
 364 {
 365         int my_buffer_offset = 0;
 366         char * const my_base = page_buffer;
 367
 368         ARM_SAVE(ARM_CKCTL);
 369         ARM_SAVE(ARM_IDLECT1);
 370         ARM_SAVE(ARM_IDLECT2);
 371         if (!(cpu_is_omap1510()))
 372                 ARM_SAVE(ARM_IDLECT3);
 373         ARM_SAVE(ARM_EWUPCT);
 374         ARM_SAVE(ARM_RSTCT1);
 375         ARM_SAVE(ARM_RSTCT2);
 376         ARM_SAVE(ARM_SYSST);
 377
 378         ULPD_SAVE(ULPD_IT_STATUS);
 379         ULPD_SAVE(ULPD_CLOCK_CTRL);
 380         ULPD_SAVE(ULPD_SOFT_REQ);
 381         ULPD_SAVE(ULPD_STATUS_REQ);
 382         ULPD_SAVE(ULPD_DPLL_CTRL);
 383         ULPD_SAVE(ULPD_POWER_CTRL);
 384
 385         if (cpu_is_omap730()) {
 386                 MPUI730_SAVE(MPUI_CTRL);
 387                 MPUI730_SAVE(MPUI_DSP_STATUS);
 388                 MPUI730_SAVE(MPUI_DSP_BOOT_CONFIG);
 389                 MPUI730_SAVE(MPUI_DSP_API_CONFIG);
 390                 MPUI730_SAVE(EMIFF_SDRAM_CONFIG);
 391                 MPUI730_SAVE(EMIFS_CONFIG);
 392         } else if (cpu_is_omap1510()) {
 393                 MPUI1510_SAVE(MPUI_CTRL);
 394                 MPUI1510_SAVE(MPUI_DSP_STATUS);
 395                 MPUI1510_SAVE(MPUI_DSP_BOOT_CONFIG);
 396                 MPUI1510_SAVE(MPUI_DSP_API_CONFIG);
 397                 MPUI1510_SAVE(EMIFF_SDRAM_CONFIG);
 398                 MPUI1510_SAVE(EMIFS_CONFIG);
 399         } else if (cpu_is_omap16xx()) {
 400                 MPUI1610_SAVE(MPUI_CTRL);
 401                 MPUI1610_SAVE(MPUI_DSP_STATUS);
 402                 MPUI1610_SAVE(MPUI_DSP_BOOT_CONFIG);
 403                 MPUI1610_SAVE(MPUI_DSP_API_CONFIG);
 404                 MPUI1610_SAVE(EMIFF_SDRAM_CONFIG);
 405                 MPUI1610_SAVE(EMIFS_CONFIG);
 406         }
 407
 408         if (virtual_start == 0) {
 409                 g_read_completed = 0;
 410
 411                 my_buffer_offset += sprintf(my_base + my_buffer_offset,
 412                    "ARM_CKCTL_REG:            0x%-8x     \n"
 413                    "ARM_IDLECT1_REG:          0x%-8x     \n"
 414                    "ARM_IDLECT2_REG:          0x%-8x     \n"
 415                    "ARM_IDLECT3_REG:          0x%-8x     \n"
 416                    "ARM_EWUPCT_REG:           0x%-8x     \n"
 417                    "ARM_RSTCT1_REG:           0x%-8x     \n"
 418                    "ARM_RSTCT2_REG:           0x%-8x     \n"
 419                    "ARM_SYSST_REG:            0x%-8x     \n"
 420                    "ULPD_IT_STATUS_REG:       0x%-4x     \n"
 421                    "ULPD_CLOCK_CTRL_REG:      0x%-4x     \n"
 422                    "ULPD_SOFT_REQ_REG:        0x%-4x     \n"
 423                    "ULPD_DPLL_CTRL_REG:       0x%-4x     \n"
 424                    "ULPD_STATUS_REQ_REG:      0x%-4x     \n"
 425                    "ULPD_POWER_CTRL_REG:      0x%-4x     \n",
 426                    ARM_SHOW(ARM_CKCTL),
 427                    ARM_SHOW(ARM_IDLECT1),
 428                    ARM_SHOW(ARM_IDLECT2),
 429                    ARM_SHOW(ARM_IDLECT3),
 430                    ARM_SHOW(ARM_EWUPCT),
 431                    ARM_SHOW(ARM_RSTCT1),
 432                    ARM_SHOW(ARM_RSTCT2),
 433                    ARM_SHOW(ARM_SYSST),
 434                    ULPD_SHOW(ULPD_IT_STATUS),
 435                    ULPD_SHOW(ULPD_CLOCK_CTRL),
 436                    ULPD_SHOW(ULPD_SOFT_REQ),
 437                    ULPD_SHOW(ULPD_DPLL_CTRL),
 438                    ULPD_SHOW(ULPD_STATUS_REQ),
 439                    ULPD_SHOW(ULPD_POWER_CTRL));
 440
 441                 if (cpu_is_omap730()) {
 442                         my_buffer_offset += sprintf(my_base + my_buffer_offset,
 443                            "MPUI730_CTRL_REG         0x%-8x \n"
 444                            "MPUI730_DSP_STATUS_REG:      0x%-8x \n"
 445                            "MPUI730_DSP_BOOT_CONFIG_REG: 0x%-8x \n"
 446          "MPUI730_DSP_API_CONFIG_REG:  0x%-8x \n"
 447          "MPUI730_SDRAM_CONFIG_REG:    0x%-8x \n"
 448          "MPUI730_EMIFS_CONFIG_REG:    0x%-8x \n",
 449          MPUI730_SHOW(MPUI_CTRL),
 450          MPUI730_SHOW(MPUI_DSP_STATUS),
 451          MPUI730_SHOW(MPUI_DSP_BOOT_CONFIG),
 452          MPUI730_SHOW(MPUI_DSP_API_CONFIG),
 453          MPUI730_SHOW(EMIFF_SDRAM_CONFIG),
 454          MPUI730_SHOW(EMIFS_CONFIG));
 455                 } else if (cpu_is_omap1510()) {
 456                         my_buffer_offset += sprintf(my_base + my_buffer_offset,
 457                            "MPUI1510_CTRL_REG             0x%-8x \n"
 458                            "MPUI1510_DSP_STATUS_REG:      0x%-8x \n"
 459                            "MPUI1510_DSP_BOOT_CONFIG_REG: 0x%-8x \n"
 460                            "MPUI1510_DSP_API_CONFIG_REG:  0x%-8x \n"
 461                            "MPUI1510_SDRAM_CONFIG_REG:    0x%-8x \n"
 462                            "MPUI1510_EMIFS_CONFIG_REG:    0x%-8x \n",
 463                            MPUI1510_SHOW(MPUI_CTRL),
 464                            MPUI1510_SHOW(MPUI_DSP_STATUS),
 465                            MPUI1510_SHOW(MPUI_DSP_BOOT_CONFIG),
 466                            MPUI1510_SHOW(MPUI_DSP_API_CONFIG),
 467                            MPUI1510_SHOW(EMIFF_SDRAM_CONFIG),
 468                            MPUI1510_SHOW(EMIFS_CONFIG));
 469                 } else if (cpu_is_omap16xx()) {
 470                         my_buffer_offset += sprintf(my_base + my_buffer_offset,
 471                            "MPUI1610_CTRL_REG             0x%-8x \n"
 472                            "MPUI1610_DSP_STATUS_REG:      0x%-8x \n"
 473                            "MPUI1610_DSP_BOOT_CONFIG_REG: 0x%-8x \n"
 474                            "MPUI1610_DSP_API_CONFIG_REG:  0x%-8x \n"
 475                            "MPUI1610_SDRAM_CONFIG_REG:    0x%-8x \n"
 476                            "MPUI1610_EMIFS_CONFIG_REG:    0x%-8x \n",
 477                            MPUI1610_SHOW(MPUI_CTRL),
 478                            MPUI1610_SHOW(MPUI_DSP_STATUS),
 479                            MPUI1610_SHOW(MPUI_DSP_BOOT_CONFIG),
 480                            MPUI1610_SHOW(MPUI_DSP_API_CONFIG),
 481                            MPUI1610_SHOW(EMIFF_SDRAM_CONFIG),
 482                            MPUI1610_SHOW(EMIFS_CONFIG));
 483                 }
 484
 485                 g_read_completed++;
 486         } else if (g_read_completed >= 1) {
 487                  *eof = 1;
 488                  return 0;
 489         }
 490         g_read_completed++;
 491
 492         *my_first_byte = page_buffer;
 493         return  my_buffer_offset;
 494 }
 495
 496 static void omap_pm_init_proc(void)
 497 {
 498         struct proc_dir_entry *entry;
 499
 500         entry = create_proc_read_entry("driver/omap_pm",
 501                                        S_IWUSR | S_IRUGO, NULL,
 502            omap_pm_read_proc, NULL);
 503 }
 504
 505 #endif /* DEBUG && CONFIG_PROC_FS */
 506
 507 /*
 508  *      omap_pm_prepare - Do preliminary suspend work.
 509  *      @state:         suspend state we're entering.
 510  *
 511  */
 512 //#include <asm/hardware.h>
 513
 514 static int omap_pm_prepare(suspend_state_t state)
 515 {
 516         int error = 0;
 517
 518         switch (state)
 519         {
 520         case PM_SUSPEND_STANDBY:
 521         case PM_SUSPEND_MEM:
 522                 break;
 523
 524         case PM_SUSPEND_DISK:
 525                 return -ENOTSUPP;
 526
 527         default:
 528                 return -EINVAL;
 529         }
 530
 531         return error;
 532 }
 533
 534
 535 /*
 536  *      omap_pm_enter - Actually enter a sleep state.
 537  *      @state:         State we're entering.
 538  *
 539  */
 540
 541 static int omap_pm_enter(suspend_state_t state)
 542 {
 543         switch (state)
 544         {
 545         case PM_SUSPEND_STANDBY:
 546         case PM_SUSPEND_MEM:
 547                 omap_pm_suspend();
 548                 break;
 549
 550         case PM_SUSPEND_DISK:
 551                 return -ENOTSUPP;
 552
 553         default:
 554                 return -EINVAL;
 555         }
 556
 557         return 0;
 558 }
 559
 560
 561 /**
 562  *      omap_pm_finish - Finish up suspend sequence.
 563  *      @state:         State we're coming out of.
 564  *
 565  *      This is called after we wake back up (or if entering the sleep state
 566  *      failed).
 567  */
 568
 569 static int omap_pm_finish(suspend_state_t state)
 570 {
 571         return 0;
 572 }
 573
 574
 575 static irqreturn_t  omap_wakeup_interrupt(int  irq, void *  dev,
 576                                      struct pt_regs *  regs)
 577 {
 578         return IRQ_HANDLED;
 579 }
 580
 581 static struct irqaction omap_wakeup_irq = {
 582         .name           = "peripheral wakeup",
 583         .flags          = IRQF_DISABLED,
 584         .handler        = omap_wakeup_interrupt
 585 };
 586
 587
 588
 589 static struct pm_ops omap_pm_ops ={
 590         .pm_disk_mode = 0,
 591         .prepare        = omap_pm_prepare,
 592         .enter          = omap_pm_enter,
 593         .finish         = omap_pm_finish,
 594 };
 595
 596 static int __init omap_pm_init(void)
 597 {
 598         printk("Power Management for TI OMAP.\n");
 599         /*
 600          * We copy the assembler sleep/wakeup routines to SRAM.
 601          * These routines need to be in SRAM as that's the only
 602          * memory the MPU can see when it wakes up.
 603          */
 604         if (cpu_is_omap730()) {
 605                 omap_sram_idle = omap_sram_push(omap730_idle_loop_suspend,
 606                                                 omap730_idle_loop_suspend_sz);
 607                 omap_sram_suspend = omap_sram_push(omap730_cpu_suspend,
 608          omap730_cpu_suspend_sz);
 609         } else if (cpu_is_omap1510()) {
 610                 omap_sram_idle = omap_sram_push(omap1510_idle_loop_suspend,
 611                                                 omap1510_idle_loop_suspend_sz);
 612                 omap_sram_suspend = omap_sram_push(omap1510_cpu_suspend,
 613                                                    omap1510_cpu_suspend_sz);
 614         } else if (cpu_is_omap16xx()) {
 615                 omap_sram_idle = omap_sram_push(omap1610_idle_loop_suspend,
 616                                                 omap1610_idle_loop_suspend_sz);
 617                 omap_sram_suspend = omap_sram_push(omap1610_cpu_suspend,
 618                                                    omap1610_cpu_suspend_sz);
 619         }
 620
 621         if (omap_sram_idle == NULL || omap_sram_suspend == NULL) {
 622                 printk(KERN_ERR "PM not initialized: Missing SRAM support\n");
 623                 return -ENODEV;
 624         }
 625
 626         pm_idle = omap_pm_idle;
 627
 628         if (cpu_is_omap730())
 629                 setup_irq(INT_730_WAKE_UP_REQ, &omap_wakeup_irq);
 630         else if (cpu_is_omap16xx())
 631                 setup_irq(INT_1610_WAKE_UP_REQ, &omap_wakeup_irq);
 632
 633 #if 0
 634         /* --- BEGIN BOARD-DEPENDENT CODE --- */
 635         /* Sleepx mask direction */
 636         omap_writew((omap_readw(0xfffb5008) & ~2), 0xfffb5008);
 637         /* Unmask sleepx signal */
 638         omap_writew((omap_readw(0xfffb5004) & ~2), 0xfffb5004);
 639         /* --- END BOARD-DEPENDENT CODE --- */
 640 #endif
 641
 642         /* Program new power ramp-up time
 643          * (0 for most boards since we don't lower voltage when in deep sleep)
 644          */
 645         omap_writew(ULPD_SETUP_ANALOG_CELL_3_VAL, ULPD_SETUP_ANALOG_CELL_3);
 646
 647         /* Setup ULPD POWER_CTRL_REG - enter deep sleep whenever possible */
 648         omap_writew(ULPD_POWER_CTRL_REG_VAL, ULPD_POWER_CTRL);
 649
 650         /* Configure IDLECT3 */
 651         if (cpu_is_omap730())
 652                 omap_writel(OMAP730_IDLECT3_VAL, OMAP730_IDLECT3);
 653         else if (cpu_is_omap16xx())
 654                 omap_writel(OMAP1610_IDLECT3_VAL, OMAP1610_IDLECT3);
 655
 656         pm_set_ops(&omap_pm_ops);
 657
 658 #if defined(DEBUG) && defined(CONFIG_PROC_FS)
 659         omap_pm_init_proc();
 660 #endif
 661
 662         if (cpu_is_omap16xx()) {
 663                 /* configure LOW_PWR pin */
 664                 omap_cfg_reg(T20_1610_LOW_PWR);
 665         }
 666
 667         return 0;
 668 }
 669 __initcall(omap_pm_init);
 670