arch/arm/mach-omap1/pm.c

   1 //kernel/linux-omap-fsample/arch/arm/mach-omap1/pm.c#3 - integrate change 4545 (text)
   2 /*
   3  * linux/arch/arm/mach-omap1/pm.c
   4  *
   5  * OMAP Power Management Routines
   6  *
   7  * Original code for the SA11x0:
   8  * Copyright (c) 2001 Cliff Brake <cbrake@accelent.com>
   9  *
  10  * Modified for the PXA250 by Nicolas Pitre:
  11  * Copyright (c) 2002 Monta Vista Software, Inc.
  12  *
  13  * Modified for the OMAP1510 by David Singleton:
  14  * Copyright (c) 2002 Monta Vista Software, Inc.
  15  *
  16  * Cleanup 2004 for OMAP1510/1610 by Dirk Behme <dirk.behme@de.bosch.com>
  17  *
  18  * This program is free software; you can redistribute it and/or modify it
  19  * under the terms of the GNU General Public License as published by the
  20  * Free Software Foundation; either version 2 of the License, or (at your
  21  * option) any later version.
  22  *
  23  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  24  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  25  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
  26  * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  27  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  28  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
  29  * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
  30  * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  31  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  32  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  33  *
  34  * You should have received a copy of the GNU General Public License along
  35  * with this program; if not, write to the Free Software Foundation, Inc.,
  36  * 675 Mass Ave, Cambridge, MA 02139, USA.
  37  */
  38
  39 #include <linux/pm.h>
  40 #include <linux/sched.h>
  41 #include <linux/proc_fs.h>
  42 #include <linux/pm.h>
  43 #include <linux/interrupt.h>
  44 #include <linux/sysfs.h>
  45 #include <linux/module.h>
  46
  47 #include <asm/io.h>
  48 #include <asm/irq.h>
  49 #include <asm/atomic.h>
  50 #include <asm/mach/time.h>
  51 #include <asm/mach/irq.h>
  52 #include <asm/mach-types.h>
  53
  54 #include <asm/arch/cpu.h>
  55 #include <asm/arch/irqs.h>
  56 #include <asm/arch/clock.h>
  57 #include <asm/arch/sram.h>
  58 #include <asm/arch/tc.h>
  59 #include <asm/arch/pm.h>
  60 #include <asm/arch/mux.h>
  61 #include <asm/arch/tps65010.h>
  62 #include <asm/arch/dma.h>
  63 #include <asm/arch/dsp_common.h>
  64 #include <asm/arch/dmtimer.h>
  65
  66 static unsigned int arm_sleep_save[ARM_SLEEP_SAVE_SIZE];
  67 static unsigned short dsp_sleep_save[DSP_SLEEP_SAVE_SIZE];
  68 static unsigned short ulpd_sleep_save[ULPD_SLEEP_SAVE_SIZE];
  69 static unsigned int mpui730_sleep_save[MPUI730_SLEEP_SAVE_SIZE];
  70 static unsigned int mpui1510_sleep_save[MPUI1510_SLEEP_SAVE_SIZE];
  71 static unsigned int mpui1610_sleep_save[MPUI1610_SLEEP_SAVE_SIZE];
  72
  73 static unsigned short enable_dyn_sleep = 1;
  74
  75 static ssize_t omap_pm_sleep_while_idle_show(struct subsystem * subsys, char *buf)
  76 {
  77         return sprintf(buf, "%hu\n", enable_dyn_sleep);
  78 }
  79
  80 static ssize_t omap_pm_sleep_while_idle_store(struct subsystem * subsys,
  81                                               const char * buf,
  82                                               size_t n)
  83 {
  84         unsigned short value;
  85         if (sscanf(buf, "%hu", &value) != 1 ||
  86             (value != 0 && value != 1)) {
  87                 printk(KERN_ERR "idle_sleep_store: Invalid value\n");
  88                 return -EINVAL;
  89         }
  90         enable_dyn_sleep = value;
  91         return n;
  92 }
  93
  94 static struct subsys_attribute sleep_while_idle_attr = {
  95         .attr   = {
  96                 .name = __stringify(sleep_while_idle),
  97                 .mode = 0644,
  98         },
  99         .show   = omap_pm_sleep_while_idle_show,
 100         .store  = omap_pm_sleep_while_idle_store,
 101 };
 102
 103 extern struct subsystem power_subsys;
 104 static void (*omap_sram_idle)(void) = NULL;
 105 static void (*omap_sram_suspend)(unsigned long r0, unsigned long r1) = NULL;
 106
 107 /*
 108  * Let's power down on idle, but only if we are really
 109  * idle, because once we start down the path of
 110  * going idle we continue to do idle even if we get
 111  * a clock tick interrupt . .
 112  */
 113 void omap_pm_idle(void)
 114 {
 115         extern __u32 arm_idlect1_mask;
 116         __u32 use_idlect1 = arm_idlect1_mask;
 117 #ifndef CONFIG_OMAP_MPU_TIMER
 118         int do_sleep;
 119 #endif
 120
 121         local_irq_disable();
 122         local_fiq_disable();
 123         if (need_resched()) {
 124                 local_fiq_enable();
 125                 local_irq_enable();
 126                 return;
 127         }
 128
 129         /*
 130          * Since an interrupt may set up a timer, we don't want to
 131          * reprogram the hardware timer with interrupts enabled.
 132          * Re-enable interrupts only after returning from idle.
 133          */
 134         timer_dyn_reprogram();
 135
 136 #ifdef CONFIG_OMAP_MPU_TIMER
 137 #warning Enable 32kHz OS timer in order to allow sleep states in idle
 138         use_idlect1 = use_idlect1 & ~(1 << 9);
 139 #else
 140
 141         do_sleep = 0;
 142         while (enable_dyn_sleep) {
 143
 144 #ifdef CONFIG_CBUS_TAHVO_USB
 145                 extern int vbus_active;
 146                 /* Clock requirements? */
 147                 if (vbus_active)
 148                         break;
 149 #endif
 150                 do_sleep = 1;
 151                 break;
 152         }
 153
 154 #ifdef CONFIG_OMAP_DM_TIMER
 155         use_idlect1 = omap_dm_timer_modify_idlect_mask(use_idlect1);
 156 #endif
 157
 158         if (omap_dma_running()) {
 159                 use_idlect1 &= ~(1 << 6);
 160                 if (omap_lcd_dma_ext_running())
 161                         use_idlect1 &= ~(1 << 12);
 162         }
 163
 164         /* We should be able to remove the do_sleep variable and multiple
 165          * tests above as soon as drivers, timer and DMA code have been fixed.
 166          * Even the sleep block count should become obsolete. */
 167         if ((use_idlect1 != ~0) || !do_sleep) {
 168
 169                 __u32 saved_idlect1 = omap_readl(ARM_IDLECT1);
 170                 if (cpu_is_omap15xx())
 171                         use_idlect1 &= OMAP1510_BIG_SLEEP_REQUEST;
 172                 else
 173                         use_idlect1 &= OMAP1610_IDLECT1_SLEEP_VAL;
 174                 omap_writel(use_idlect1, ARM_IDLECT1);
 175                 __asm__ volatile ("mcr  p15, 0, r0, c7, c0, 4");
 176                 omap_writel(saved_idlect1, ARM_IDLECT1);
 177
 178                 local_fiq_enable();
 179                 local_irq_enable();
 180                 return;
 181         }
 182         omap_sram_suspend(omap_readl(ARM_IDLECT1),
 183                           omap_readl(ARM_IDLECT2));
 184 #endif
 185
 186         local_fiq_enable();
 187         local_irq_enable();
 188 }
 189
 190 /*
 191  * Configuration of the wakeup event is board specific. For the
 192  * moment we put it into this helper function. Later it may move
 193  * to board specific files.
 194  */
 195 static void omap_pm_wakeup_setup(void)
 196 {
 197         u32 level1_wake = 0;
 198         u32 level2_wake = OMAP_IRQ_BIT(INT_UART2);
 199
 200         /*
 201          * Turn off all interrupts except GPIO bank 1, L1-2nd level cascade,
 202          * and the L2 wakeup interrupts: keypad and UART2. Note that the
 203          * drivers must still separately call omap_set_gpio_wakeup() to
 204          * wake up to a GPIO interrupt.
 205          */
 206         if (cpu_is_omap730())
 207                 level1_wake = OMAP_IRQ_BIT(INT_730_GPIO_BANK1) |
 208                         OMAP_IRQ_BIT(INT_730_IH2_IRQ);
 209         else if (cpu_is_omap15xx())
 210                 level1_wake = OMAP_IRQ_BIT(INT_GPIO_BANK1) |
 211                         OMAP_IRQ_BIT(INT_1510_IH2_IRQ);
 212         else if (cpu_is_omap16xx())
 213                 level1_wake = OMAP_IRQ_BIT(INT_GPIO_BANK1) |
 214                         OMAP_IRQ_BIT(INT_1610_IH2_IRQ);
 215
 216         omap_writel(~level1_wake, OMAP_IH1_MIR);
 217
 218         if (cpu_is_omap730()) {
 219                 omap_writel(~level2_wake, OMAP_IH2_0_MIR);
 220                 omap_writel(~(OMAP_IRQ_BIT(INT_730_WAKE_UP_REQ) |
 221                                 OMAP_IRQ_BIT(INT_730_MPUIO_KEYPAD)),
 222                                 OMAP_IH2_1_MIR);
 223         } else if (cpu_is_omap15xx()) {
 224                 level2_wake |= OMAP_IRQ_BIT(INT_KEYBOARD);
 225                 omap_writel(~level2_wake,  OMAP_IH2_MIR);
 226         } else if (cpu_is_omap16xx()) {
 227                 level2_wake |= OMAP_IRQ_BIT(INT_KEYBOARD);
 228                 omap_writel(~level2_wake, OMAP_IH2_0_MIR);
 229
 230                 /* INT_1610_WAKE_UP_REQ is needed for GPIO wakeup... */
 231                 omap_writel(~OMAP_IRQ_BIT(INT_1610_WAKE_UP_REQ),
 232                             OMAP_IH2_1_MIR);
 233                 omap_writel(~0x0, OMAP_IH2_2_MIR);
 234                 omap_writel(~0x0, OMAP_IH2_3_MIR);
 235         }
 236
 237         /*  New IRQ agreement, recalculate in cascade order */
 238         omap_writel(1, OMAP_IH2_CONTROL);
 239         omap_writel(1, OMAP_IH1_CONTROL);
 240 }
 241
 242 #define EN_DSPCK        13      /* ARM_CKCTL */
 243 #define EN_APICK        6       /* ARM_IDLECT2 */
 244 #define DSP_EN          1       /* ARM_RSTCT1 */
 245
 246 void omap_pm_suspend(void)
 247 {
 248         unsigned long arg0 = 0, arg1 = 0;
 249
 250         printk("PM: OMAP%x is trying to enter deep sleep...\n", system_rev);
 251
 252         omap_serial_wake_trigger(1);
 253
 254         if (machine_is_omap_osk()) {
 255                 /* Stop LED1 (D9) blink */
 256                 tps65010_set_led(LED1, OFF);
 257         }
 258
 259         omap_writew(0xffff, ULPD_SOFT_DISABLE_REQ_REG);
 260
 261         /*
 262          * Step 1: turn off interrupts (FIXME: NOTE: already disabled)
 263          */
 264
 265         local_irq_disable();
 266         local_fiq_disable();
 267
 268         /*
 269          * Step 2: save registers
 270          *
 271          * The omap is a strange/beautiful device. The caches, memory
 272          * and register state are preserved across power saves.
 273          * We have to save and restore very little register state to
 274          * idle the omap.
 275          *
 276          * Save interrupt, MPUI, ARM and UPLD control registers.
 277          */
 278
 279         if (cpu_is_omap730()) {
 280                 MPUI730_SAVE(OMAP_IH1_MIR);
 281                 MPUI730_SAVE(OMAP_IH2_0_MIR);
 282                 MPUI730_SAVE(OMAP_IH2_1_MIR);
 283                 MPUI730_SAVE(MPUI_CTRL);
 284                 MPUI730_SAVE(MPUI_DSP_BOOT_CONFIG);
 285                 MPUI730_SAVE(MPUI_DSP_API_CONFIG);
 286                 MPUI730_SAVE(EMIFS_CONFIG);
 287                 MPUI730_SAVE(EMIFF_SDRAM_CONFIG);
 288
 289         } else if (cpu_is_omap15xx()) {
 290                 MPUI1510_SAVE(OMAP_IH1_MIR);
 291                 MPUI1510_SAVE(OMAP_IH2_MIR);
 292                 MPUI1510_SAVE(MPUI_CTRL);
 293                 MPUI1510_SAVE(MPUI_DSP_BOOT_CONFIG);
 294                 MPUI1510_SAVE(MPUI_DSP_API_CONFIG);
 295                 MPUI1510_SAVE(EMIFS_CONFIG);
 296                 MPUI1510_SAVE(EMIFF_SDRAM_CONFIG);
 297         } else if (cpu_is_omap16xx()) {
 298                 MPUI1610_SAVE(OMAP_IH1_MIR);
 299                 MPUI1610_SAVE(OMAP_IH2_0_MIR);
 300                 MPUI1610_SAVE(OMAP_IH2_1_MIR);
 301                 MPUI1610_SAVE(OMAP_IH2_2_MIR);
 302                 MPUI1610_SAVE(OMAP_IH2_3_MIR);
 303                 MPUI1610_SAVE(MPUI_CTRL);
 304                 MPUI1610_SAVE(MPUI_DSP_BOOT_CONFIG);
 305                 MPUI1610_SAVE(MPUI_DSP_API_CONFIG);
 306                 MPUI1610_SAVE(EMIFS_CONFIG);
 307                 MPUI1610_SAVE(EMIFF_SDRAM_CONFIG);
 308         }
 309
 310         ARM_SAVE(ARM_CKCTL);
 311         ARM_SAVE(ARM_IDLECT1);
 312         ARM_SAVE(ARM_IDLECT2);
 313         if (!(cpu_is_omap15xx()))
 314                 ARM_SAVE(ARM_IDLECT3);
 315         ARM_SAVE(ARM_EWUPCT);
 316         ARM_SAVE(ARM_RSTCT1);
 317         ARM_SAVE(ARM_RSTCT2);
 318         ARM_SAVE(ARM_SYSST);
 319         ULPD_SAVE(ULPD_CLOCK_CTRL);
 320         ULPD_SAVE(ULPD_STATUS_REQ);
 321
 322         /* (Step 3 removed - we now allow deep sleep by default) */
 323
 324         /*
 325          * Step 4: OMAP DSP Shutdown
 326          */
 327
 328         /* stop DSP */
 329         omap_writew(omap_readw(ARM_RSTCT1) & ~(1 << DSP_EN), ARM_RSTCT1);
 330
 331                 /* shut down dsp_ck */
 332         if (!cpu_is_omap730())
 333                 omap_writew(omap_readw(ARM_CKCTL) & ~(1 << EN_DSPCK), ARM_CKCTL);
 334
 335         /* temporarily enabling api_ck to access DSP registers */
 336         omap_writew(omap_readw(ARM_IDLECT2) | 1 << EN_APICK, ARM_IDLECT2);
 337
 338         /* save DSP registers */
 339         DSP_SAVE(DSP_IDLECT2);
 340
 341         /* Stop all DSP domain clocks */
 342         __raw_writew(0, DSP_IDLECT2);
 343
 344         /*
 345          * Step 5: Wakeup Event Setup
 346          */
 347
 348         omap_pm_wakeup_setup();
 349
 350         /*
 351          * Step 6: ARM and Traffic controller shutdown
 352          */
 353
 354         /* disable ARM watchdog */
 355         omap_writel(0x00F5, OMAP_WDT_TIMER_MODE);
 356         omap_writel(0x00A0, OMAP_WDT_TIMER_MODE);
 357
 358         /*
 359          * Step 6b: ARM and Traffic controller shutdown
 360          *
 361          * Step 6 continues here. Prepare jump to power management
 362          * assembly code in internal SRAM.
 363          *
 364          * Since the omap_cpu_suspend routine has been copied to
 365          * SRAM, we'll do an indirect procedure call to it and pass the
 366          * contents of arm_idlect1 and arm_idlect2 so it can restore
 367          * them when it wakes up and it will return.
 368          */
 369
 370         arg0 = arm_sleep_save[ARM_SLEEP_SAVE_ARM_IDLECT1];
 371         arg1 = arm_sleep_save[ARM_SLEEP_SAVE_ARM_IDLECT2];
 372
 373         /*
 374          * Step 6c: ARM and Traffic controller shutdown
 375          *
 376          * Jump to assembly code. The processor will stay there
 377          * until wake up.
 378          */
 379         omap_sram_suspend(arg0, arg1);
 380
 381         /*
 382          * If we are here, processor is woken up!
 383          */
 384
 385         /*
 386          * Restore DSP clocks
 387          */
 388
 389         /* again temporarily enabling api_ck to access DSP registers */
 390         omap_writew(omap_readw(ARM_IDLECT2) | 1 << EN_APICK, ARM_IDLECT2);
 391
 392         /* Restore DSP domain clocks */
 393         DSP_RESTORE(DSP_IDLECT2);
 394
 395         /*
 396          * Restore ARM state, except ARM_IDLECT1/2 which omap_cpu_suspend did
 397          */
 398
 399         if (!(cpu_is_omap15xx()))
 400                 ARM_RESTORE(ARM_IDLECT3);
 401         ARM_RESTORE(ARM_CKCTL);
 402         ARM_RESTORE(ARM_EWUPCT);
 403         ARM_RESTORE(ARM_RSTCT1);
 404         ARM_RESTORE(ARM_RSTCT2);
 405         ARM_RESTORE(ARM_SYSST);
 406         ULPD_RESTORE(ULPD_CLOCK_CTRL);
 407         ULPD_RESTORE(ULPD_STATUS_REQ);
 408
 409         if (cpu_is_omap730()) {
 410                 MPUI730_RESTORE(EMIFS_CONFIG);
 411                 MPUI730_RESTORE(EMIFF_SDRAM_CONFIG);
 412                 MPUI730_RESTORE(OMAP_IH1_MIR);
 413                 MPUI730_RESTORE(OMAP_IH2_0_MIR);
 414                 MPUI730_RESTORE(OMAP_IH2_1_MIR);
 415         } else if (cpu_is_omap15xx()) {
 416                 MPUI1510_RESTORE(MPUI_CTRL);
 417                 MPUI1510_RESTORE(MPUI_DSP_BOOT_CONFIG);
 418                 MPUI1510_RESTORE(MPUI_DSP_API_CONFIG);
 419                 MPUI1510_RESTORE(EMIFS_CONFIG);
 420                 MPUI1510_RESTORE(EMIFF_SDRAM_CONFIG);
 421                 MPUI1510_RESTORE(OMAP_IH1_MIR);
 422                 MPUI1510_RESTORE(OMAP_IH2_MIR);
 423         } else if (cpu_is_omap16xx()) {
 424                 MPUI1610_RESTORE(MPUI_CTRL);
 425                 MPUI1610_RESTORE(MPUI_DSP_BOOT_CONFIG);
 426                 MPUI1610_RESTORE(MPUI_DSP_API_CONFIG);
 427                 MPUI1610_RESTORE(EMIFS_CONFIG);
 428                 MPUI1610_RESTORE(EMIFF_SDRAM_CONFIG);
 429
 430                 MPUI1610_RESTORE(OMAP_IH1_MIR);
 431                 MPUI1610_RESTORE(OMAP_IH2_0_MIR);
 432                 MPUI1610_RESTORE(OMAP_IH2_1_MIR);
 433                 MPUI1610_RESTORE(OMAP_IH2_2_MIR);
 434                 MPUI1610_RESTORE(OMAP_IH2_3_MIR);
 435         }
 436
 437         omap_writew(0, ULPD_SOFT_DISABLE_REQ_REG);
 438
 439         /*
 440          * Reenable interrupts
 441          */
 442
 443         local_irq_enable();
 444         local_fiq_enable();
 445
 446         omap_serial_wake_trigger(0);
 447
 448         printk("PM: OMAP%x is re-starting from deep sleep...\n", system_rev);
 449
 450         if (machine_is_omap_osk()) {
 451                 /* Let LED1 (D9) blink again */
 452                 tps65010_set_led(LED1, BLINK);
 453         }
 454 }
 455
 456 #if defined(DEBUG) && defined(CONFIG_PROC_FS)
 457 static int g_read_completed;
 458
 459 /*
 460  * Read system PM registers for debugging
 461  */
 462 static int omap_pm_read_proc(
 463         char *page_buffer,
 464         char **my_first_byte,
 465         off_t virtual_start,
 466         int length,
 467         int *eof,
 468         void *data)
 469 {
 470         int my_buffer_offset = 0;
 471         char * const my_base = page_buffer;
 472
 473         ARM_SAVE(ARM_CKCTL);
 474         ARM_SAVE(ARM_IDLECT1);
 475         ARM_SAVE(ARM_IDLECT2);
 476         if (!(cpu_is_omap15xx()))
 477                 ARM_SAVE(ARM_IDLECT3);
 478         ARM_SAVE(ARM_EWUPCT);
 479         ARM_SAVE(ARM_RSTCT1);
 480         ARM_SAVE(ARM_RSTCT2);
 481         ARM_SAVE(ARM_SYSST);
 482
 483         ULPD_SAVE(ULPD_IT_STATUS);
 484         ULPD_SAVE(ULPD_CLOCK_CTRL);
 485         ULPD_SAVE(ULPD_SOFT_REQ);
 486         ULPD_SAVE(ULPD_STATUS_REQ);
 487         ULPD_SAVE(ULPD_DPLL_CTRL);
 488         ULPD_SAVE(ULPD_POWER_CTRL);
 489
 490         if (cpu_is_omap730()) {
 491                 MPUI730_SAVE(MPUI_CTRL);
 492                 MPUI730_SAVE(MPUI_DSP_STATUS);
 493                 MPUI730_SAVE(MPUI_DSP_BOOT_CONFIG);
 494                 MPUI730_SAVE(MPUI_DSP_API_CONFIG);
 495                 MPUI730_SAVE(EMIFF_SDRAM_CONFIG);
 496                 MPUI730_SAVE(EMIFS_CONFIG);
 497         } else if (cpu_is_omap15xx()) {
 498                 MPUI1510_SAVE(MPUI_CTRL);
 499                 MPUI1510_SAVE(MPUI_DSP_STATUS);
 500                 MPUI1510_SAVE(MPUI_DSP_BOOT_CONFIG);
 501                 MPUI1510_SAVE(MPUI_DSP_API_CONFIG);
 502                 MPUI1510_SAVE(EMIFF_SDRAM_CONFIG);
 503                 MPUI1510_SAVE(EMIFS_CONFIG);
 504         } else if (cpu_is_omap16xx()) {
 505                 MPUI1610_SAVE(MPUI_CTRL);
 506                 MPUI1610_SAVE(MPUI_DSP_STATUS);
 507                 MPUI1610_SAVE(MPUI_DSP_BOOT_CONFIG);
 508                 MPUI1610_SAVE(MPUI_DSP_API_CONFIG);
 509                 MPUI1610_SAVE(EMIFF_SDRAM_CONFIG);
 510                 MPUI1610_SAVE(EMIFS_CONFIG);
 511         }
 512
 513         if (virtual_start == 0) {
 514                 g_read_completed = 0;
 515
 516                 my_buffer_offset += sprintf(my_base + my_buffer_offset,
 517                    "ARM_CKCTL_REG:            0x%-8x     \n"
 518                    "ARM_IDLECT1_REG:          0x%-8x     \n"
 519                    "ARM_IDLECT2_REG:          0x%-8x     \n"
 520                    "ARM_IDLECT3_REG:          0x%-8x     \n"
 521                    "ARM_EWUPCT_REG:           0x%-8x     \n"
 522                    "ARM_RSTCT1_REG:           0x%-8x     \n"
 523                    "ARM_RSTCT2_REG:           0x%-8x     \n"
 524                    "ARM_SYSST_REG:            0x%-8x     \n"
 525                    "ULPD_IT_STATUS_REG:       0x%-4x     \n"
 526                    "ULPD_CLOCK_CTRL_REG:      0x%-4x     \n"
 527                    "ULPD_SOFT_REQ_REG:        0x%-4x     \n"
 528                    "ULPD_DPLL_CTRL_REG:       0x%-4x     \n"
 529                    "ULPD_STATUS_REQ_REG:      0x%-4x     \n"
 530                    "ULPD_POWER_CTRL_REG:      0x%-4x     \n",
 531                    ARM_SHOW(ARM_CKCTL),
 532                    ARM_SHOW(ARM_IDLECT1),
 533                    ARM_SHOW(ARM_IDLECT2),
 534                    ARM_SHOW(ARM_IDLECT3),
 535                    ARM_SHOW(ARM_EWUPCT),
 536                    ARM_SHOW(ARM_RSTCT1),
 537                    ARM_SHOW(ARM_RSTCT2),
 538                    ARM_SHOW(ARM_SYSST),
 539                    ULPD_SHOW(ULPD_IT_STATUS),
 540                    ULPD_SHOW(ULPD_CLOCK_CTRL),
 541                    ULPD_SHOW(ULPD_SOFT_REQ),
 542                    ULPD_SHOW(ULPD_DPLL_CTRL),
 543                    ULPD_SHOW(ULPD_STATUS_REQ),
 544                    ULPD_SHOW(ULPD_POWER_CTRL));
 545
 546                 if (cpu_is_omap730()) {
 547                         my_buffer_offset += sprintf(my_base + my_buffer_offset,
 548                            "MPUI730_CTRL_REG         0x%-8x \n"
 549                            "MPUI730_DSP_STATUS_REG:      0x%-8x \n"
 550                            "MPUI730_DSP_BOOT_CONFIG_REG: 0x%-8x \n"
 551                            "MPUI730_DSP_API_CONFIG_REG:  0x%-8x \n"
 552                            "MPUI730_SDRAM_CONFIG_REG:    0x%-8x \n"
 553                            "MPUI730_EMIFS_CONFIG_REG:    0x%-8x \n",
 554                            MPUI730_SHOW(MPUI_CTRL),
 555                            MPUI730_SHOW(MPUI_DSP_STATUS),
 556                            MPUI730_SHOW(MPUI_DSP_BOOT_CONFIG),
 557                            MPUI730_SHOW(MPUI_DSP_API_CONFIG),
 558                            MPUI730_SHOW(EMIFF_SDRAM_CONFIG),
 559                            MPUI730_SHOW(EMIFS_CONFIG));
 560                 } else if (cpu_is_omap15xx()) {
 561                         my_buffer_offset += sprintf(my_base + my_buffer_offset,
 562                            "MPUI1510_CTRL_REG             0x%-8x \n"
 563                            "MPUI1510_DSP_STATUS_REG:      0x%-8x \n"
 564                            "MPUI1510_DSP_BOOT_CONFIG_REG: 0x%-8x \n"
 565                            "MPUI1510_DSP_API_CONFIG_REG:  0x%-8x \n"
 566                            "MPUI1510_SDRAM_CONFIG_REG:    0x%-8x \n"
 567                            "MPUI1510_EMIFS_CONFIG_REG:    0x%-8x \n",
 568                            MPUI1510_SHOW(MPUI_CTRL),
 569                            MPUI1510_SHOW(MPUI_DSP_STATUS),
 570                            MPUI1510_SHOW(MPUI_DSP_BOOT_CONFIG),
 571                            MPUI1510_SHOW(MPUI_DSP_API_CONFIG),
 572                            MPUI1510_SHOW(EMIFF_SDRAM_CONFIG),
 573                            MPUI1510_SHOW(EMIFS_CONFIG));
 574                 } else if (cpu_is_omap16xx()) {
 575                         my_buffer_offset += sprintf(my_base + my_buffer_offset,
 576                            "MPUI1610_CTRL_REG             0x%-8x \n"
 577                            "MPUI1610_DSP_STATUS_REG:      0x%-8x \n"
 578                            "MPUI1610_DSP_BOOT_CONFIG_REG: 0x%-8x \n"
 579                            "MPUI1610_DSP_API_CONFIG_REG:  0x%-8x \n"
 580                            "MPUI1610_SDRAM_CONFIG_REG:    0x%-8x \n"
 581                            "MPUI1610_EMIFS_CONFIG_REG:    0x%-8x \n",
 582                            MPUI1610_SHOW(MPUI_CTRL),
 583                            MPUI1610_SHOW(MPUI_DSP_STATUS),
 584                            MPUI1610_SHOW(MPUI_DSP_BOOT_CONFIG),
 585                            MPUI1610_SHOW(MPUI_DSP_API_CONFIG),
 586                            MPUI1610_SHOW(EMIFF_SDRAM_CONFIG),
 587                            MPUI1610_SHOW(EMIFS_CONFIG));
 588                 }
 589
 590                 g_read_completed++;
 591         } else if (g_read_completed >= 1) {
 592                  *eof = 1;
 593                  return 0;
 594         }
 595         g_read_completed++;
 596
 597         *my_first_byte = page_buffer;
 598         return  my_buffer_offset;
 599 }
 600
 601 static void omap_pm_init_proc(void)
 602 {
 603         struct proc_dir_entry *entry;
 604
 605         entry = create_proc_read_entry("driver/omap_pm",
 606                                        S_IWUSR | S_IRUGO, NULL,
 607                                        omap_pm_read_proc, NULL);
 608 }
 609
 610 #endif /* DEBUG && CONFIG_PROC_FS */
 611
 612 static void (*saved_idle)(void) = NULL;
 613
 614 /*
 615  *      omap_pm_prepare - Do preliminary suspend work.
 616  *      @state:         suspend state we're entering.
 617  *
 618  */
 619 static int omap_pm_prepare(suspend_state_t state)
 620 {
 621         int error = 0;
 622
 623         /* We cannot sleep in idle until we have resumed */
 624         saved_idle = pm_idle;
 625         pm_idle = NULL;
 626
 627         switch (state)
 628         {
 629         case PM_SUSPEND_STANDBY:
 630         case PM_SUSPEND_MEM:
 631                 break;
 632
 633         case PM_SUSPEND_DISK:
 634                 return -ENOTSUPP;
 635
 636         default:
 637                 return -EINVAL;
 638         }
 639
 640         return error;
 641 }
 642
 643
 644 /*
 645  *      omap_pm_enter - Actually enter a sleep state.
 646  *      @state:         State we're entering.
 647  *
 648  */
 649
 650 static int omap_pm_enter(suspend_state_t state)
 651 {
 652         switch (state)
 653         {
 654         case PM_SUSPEND_STANDBY:
 655         case PM_SUSPEND_MEM:
 656                 omap_pm_suspend();
 657                 break;
 658
 659         case PM_SUSPEND_DISK:
 660                 return -ENOTSUPP;
 661
 662         default:
 663                 return -EINVAL;
 664         }
 665
 666         return 0;
 667 }
 668
 669
 670 /**
 671  *      omap_pm_finish - Finish up suspend sequence.
 672  *      @state:         State we're coming out of.
 673  *
 674  *      This is called after we wake back up (or if entering the sleep state
 675  *      failed).
 676  */
 677
 678 static int omap_pm_finish(suspend_state_t state)
 679 {
 680         pm_idle = saved_idle;
 681         return 0;
 682 }
 683
 684
 685 static irqreturn_t  omap_wakeup_interrupt(int  irq, void *  dev,
 686                                      struct pt_regs *  regs)
 687 {
 688         return IRQ_HANDLED;
 689 }
 690
 691 static struct irqaction omap_wakeup_irq = {
 692         .name           = "peripheral wakeup",
 693         .flags          = IRQF_DISABLED,
 694         .handler        = omap_wakeup_interrupt
 695 };
 696
 697
 698
 699 static struct pm_ops omap_pm_ops ={
 700         .pm_disk_mode   = 0,
 701         .prepare        = omap_pm_prepare,
 702         .enter          = omap_pm_enter,
 703         .finish         = omap_pm_finish,
 704 };
 705
 706 static int __init omap_pm_init(void)
 707 {
 708         printk("Power Management for TI OMAP.\n");
 709
 710         /*
 711          * We copy the assembler sleep/wakeup routines to SRAM.
 712          * These routines need to be in SRAM as that's the only
 713          * memory the MPU can see when it wakes up.
 714          */
 715         if (cpu_is_omap730()) {
 716                 omap_sram_idle = omap_sram_push(omap730_idle_loop_suspend,
 717                                                 omap730_idle_loop_suspend_sz);
 718                 omap_sram_suspend = omap_sram_push(omap730_cpu_suspend,
 719                                                    omap730_cpu_suspend_sz);
 720         } else if (cpu_is_omap15xx()) {
 721                 omap_sram_idle = omap_sram_push(omap1510_idle_loop_suspend,
 722                                                 omap1510_idle_loop_suspend_sz);
 723                 omap_sram_suspend = omap_sram_push(omap1510_cpu_suspend,
 724                                                    omap1510_cpu_suspend_sz);
 725         } else if (cpu_is_omap16xx()) {
 726                 omap_sram_idle = omap_sram_push(omap1610_idle_loop_suspend,
 727                                                 omap1610_idle_loop_suspend_sz);
 728                 omap_sram_suspend = omap_sram_push(omap1610_cpu_suspend,
 729                                                    omap1610_cpu_suspend_sz);
 730         }
 731
 732         if (omap_sram_idle == NULL || omap_sram_suspend == NULL) {
 733                 printk(KERN_ERR "PM not initialized: Missing SRAM support\n");
 734                 return -ENODEV;
 735         }
 736
 737         pm_idle = omap_pm_idle;
 738
 739         if (cpu_is_omap730())
 740                 setup_irq(INT_730_WAKE_UP_REQ, &omap_wakeup_irq);
 741         else if (cpu_is_omap16xx())
 742                 setup_irq(INT_1610_WAKE_UP_REQ, &omap_wakeup_irq);
 743
 744         /* Program new power ramp-up time
 745          * (0 for most boards since we don't lower voltage when in deep sleep)
 746          */
 747         omap_writew(ULPD_SETUP_ANALOG_CELL_3_VAL, ULPD_SETUP_ANALOG_CELL_3);
 748
 749         /* Setup ULPD POWER_CTRL_REG - enter deep sleep whenever possible */
 750         omap_writew(ULPD_POWER_CTRL_REG_VAL, ULPD_POWER_CTRL);
 751
 752         /* Configure IDLECT3 */
 753         if (cpu_is_omap730())
 754                 omap_writel(OMAP730_IDLECT3_VAL, OMAP730_IDLECT3);
 755         else if (cpu_is_omap16xx())
 756                 omap_writel(OMAP1610_IDLECT3_VAL, OMAP1610_IDLECT3);
 757
 758         pm_set_ops(&omap_pm_ops);
 759
 760 #if defined(DEBUG) && defined(CONFIG_PROC_FS)
 761         omap_pm_init_proc();
 762 #endif
 763
 764         subsys_create_file(&power_subsys, &sleep_while_idle_attr);
 765
 766         if (cpu_is_omap16xx()) {
 767                 /* configure LOW_PWR pin */
 768                 omap_cfg_reg(T20_1610_LOW_PWR);
 769         }
 770
 771         return 0;
 772 }
 773 __initcall(omap_pm_init);