2 * linux/arch/arm/mach-omap1/pm.c
4 * OMAP Power Management Routines
6 * Original code for the SA11x0:
7 * Copyright (c) 2001 Cliff Brake <cbrake@accelent.com>
9 * Modified for the PXA250 by Nicolas Pitre:
10 * Copyright (c) 2002 Monta Vista Software, Inc.
12 * Modified for the OMAP1510 by David Singleton:
13 * Copyright (c) 2002 Monta Vista Software, Inc.
15 * Cleanup 2004 for OMAP1510/1610 by Dirk Behme <dirk.behme@de.bosch.com>
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.
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.
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.
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>
47 #include <asm/atomic.h>
48 #include <asm/mach/time.h>
49 #include <asm/mach/irq.h>
52 #include <mach/irqs.h>
53 #include <mach/clock.h>
54 #include <mach/sram.h>
58 #include <mach/dmtimer.h>
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
];
69 #ifdef CONFIG_OMAP_32K_TIMER
71 static unsigned short enable_dyn_sleep
= 1;
73 static ssize_t
idle_show(struct kobject
*kobj
, struct kobj_attribute
*attr
,
76 return sprintf(buf
, "%hu\n", enable_dyn_sleep
);
79 static ssize_t
idle_store(struct kobject
*kobj
, struct kobj_attribute
*attr
,
80 const char * buf
, size_t n
)
83 if (sscanf(buf
, "%hu", &value
) != 1 ||
84 (value
!= 0 && value
!= 1)) {
85 printk(KERN_ERR
"idle_sleep_store: Invalid value\n");
88 enable_dyn_sleep
= value
;
92 static struct kobj_attribute sleep_while_idle_attr
=
93 __ATTR(sleep_while_idle
, 0644, idle_show
, idle_store
);
97 static void (*omap_sram_suspend
)(unsigned long r0
, unsigned long r1
) = NULL
;
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 . .
105 void omap1_pm_idle(void)
107 extern __u32 arm_idlect1_mask
;
108 __u32 use_idlect1
= arm_idlect1_mask
;
113 if (need_resched()) {
119 #ifdef CONFIG_OMAP_MPU_TIMER
120 #warning Enable 32kHz OS timer in order to allow sleep states in idle
121 use_idlect1
= use_idlect1
& ~(1 << 9);
124 while (enable_dyn_sleep
) {
126 #ifdef CONFIG_CBUS_TAHVO_USB
127 extern int vbus_active
;
128 /* Clock requirements? */
138 #ifdef CONFIG_OMAP_DM_TIMER
139 use_idlect1
= omap_dm_timer_modify_idlect_mask(use_idlect1
);
142 if (omap_dma_running())
143 use_idlect1
&= ~(1 << 6);
145 /* We should be able to remove the do_sleep variable and multiple
146 * tests above as soon as drivers, timer and DMA code have been fixed.
147 * Even the sleep block count should become obsolete. */
148 if ((use_idlect1
!= ~0) || !do_sleep
) {
150 __u32 saved_idlect1
= omap_readl(ARM_IDLECT1
);
151 if (cpu_is_omap15xx())
152 use_idlect1
&= OMAP1510_BIG_SLEEP_REQUEST
;
154 use_idlect1
&= OMAP1610_IDLECT1_SLEEP_VAL
;
155 omap_writel(use_idlect1
, ARM_IDLECT1
);
156 __asm__
volatile ("mcr p15, 0, r0, c7, c0, 4");
157 omap_writel(saved_idlect1
, ARM_IDLECT1
);
163 omap_sram_suspend(omap_readl(ARM_IDLECT1
),
164 omap_readl(ARM_IDLECT2
));
171 * Configuration of the wakeup event is board specific. For the
172 * moment we put it into this helper function. Later it may move
173 * to board specific files.
175 static void omap_pm_wakeup_setup(void)
178 u32 level2_wake
= OMAP_IRQ_BIT(INT_UART2
);
181 * Turn off all interrupts except GPIO bank 1, L1-2nd level cascade,
182 * and the L2 wakeup interrupts: keypad and UART2. Note that the
183 * drivers must still separately call omap_set_gpio_wakeup() to
184 * wake up to a GPIO interrupt.
186 if (cpu_is_omap730())
187 level1_wake
= OMAP_IRQ_BIT(INT_730_GPIO_BANK1
) |
188 OMAP_IRQ_BIT(INT_730_IH2_IRQ
);
189 else if (cpu_is_omap15xx())
190 level1_wake
= OMAP_IRQ_BIT(INT_GPIO_BANK1
) |
191 OMAP_IRQ_BIT(INT_1510_IH2_IRQ
);
192 else if (cpu_is_omap16xx())
193 level1_wake
= OMAP_IRQ_BIT(INT_GPIO_BANK1
) |
194 OMAP_IRQ_BIT(INT_1610_IH2_IRQ
);
196 omap_writel(~level1_wake
, OMAP_IH1_MIR
);
198 if (cpu_is_omap730()) {
199 omap_writel(~level2_wake
, OMAP_IH2_0_MIR
);
200 omap_writel(~(OMAP_IRQ_BIT(INT_730_WAKE_UP_REQ
) |
201 OMAP_IRQ_BIT(INT_730_MPUIO_KEYPAD
)),
203 } else if (cpu_is_omap15xx()) {
204 level2_wake
|= OMAP_IRQ_BIT(INT_KEYBOARD
);
205 omap_writel(~level2_wake
, OMAP_IH2_MIR
);
206 } else if (cpu_is_omap16xx()) {
207 level2_wake
|= OMAP_IRQ_BIT(INT_KEYBOARD
);
208 omap_writel(~level2_wake
, OMAP_IH2_0_MIR
);
210 /* INT_1610_WAKE_UP_REQ is needed for GPIO wakeup... */
211 omap_writel(~OMAP_IRQ_BIT(INT_1610_WAKE_UP_REQ
),
213 omap_writel(~0x0, OMAP_IH2_2_MIR
);
214 omap_writel(~0x0, OMAP_IH2_3_MIR
);
217 /* New IRQ agreement, recalculate in cascade order */
218 omap_writel(1, OMAP_IH2_CONTROL
);
219 omap_writel(1, OMAP_IH1_CONTROL
);
222 #define EN_DSPCK 13 /* ARM_CKCTL */
223 #define EN_APICK 6 /* ARM_IDLECT2 */
224 #define DSP_EN 1 /* ARM_RSTCT1 */
226 void omap1_pm_suspend(void)
228 unsigned long arg0
= 0, arg1
= 0;
230 printk(KERN_INFO
"PM: OMAP%x is trying to enter deep sleep...\n",
233 omap_serial_wake_trigger(1);
235 if (!cpu_is_omap15xx())
236 omap_writew(0xffff, ULPD_SOFT_DISABLE_REQ_REG
);
239 * Step 1: turn off interrupts (FIXME: NOTE: already disabled)
246 * Step 2: save registers
248 * The omap is a strange/beautiful device. The caches, memory
249 * and register state are preserved across power saves.
250 * We have to save and restore very little register state to
253 * Save interrupt, MPUI, ARM and UPLD control registers.
256 if (cpu_is_omap730()) {
257 MPUI730_SAVE(OMAP_IH1_MIR
);
258 MPUI730_SAVE(OMAP_IH2_0_MIR
);
259 MPUI730_SAVE(OMAP_IH2_1_MIR
);
260 MPUI730_SAVE(MPUI_CTRL
);
261 MPUI730_SAVE(MPUI_DSP_BOOT_CONFIG
);
262 MPUI730_SAVE(MPUI_DSP_API_CONFIG
);
263 MPUI730_SAVE(EMIFS_CONFIG
);
264 MPUI730_SAVE(EMIFF_SDRAM_CONFIG
);
266 } else if (cpu_is_omap15xx()) {
267 MPUI1510_SAVE(OMAP_IH1_MIR
);
268 MPUI1510_SAVE(OMAP_IH2_MIR
);
269 MPUI1510_SAVE(MPUI_CTRL
);
270 MPUI1510_SAVE(MPUI_DSP_BOOT_CONFIG
);
271 MPUI1510_SAVE(MPUI_DSP_API_CONFIG
);
272 MPUI1510_SAVE(EMIFS_CONFIG
);
273 MPUI1510_SAVE(EMIFF_SDRAM_CONFIG
);
274 } else if (cpu_is_omap16xx()) {
275 MPUI1610_SAVE(OMAP_IH1_MIR
);
276 MPUI1610_SAVE(OMAP_IH2_0_MIR
);
277 MPUI1610_SAVE(OMAP_IH2_1_MIR
);
278 MPUI1610_SAVE(OMAP_IH2_2_MIR
);
279 MPUI1610_SAVE(OMAP_IH2_3_MIR
);
280 MPUI1610_SAVE(MPUI_CTRL
);
281 MPUI1610_SAVE(MPUI_DSP_BOOT_CONFIG
);
282 MPUI1610_SAVE(MPUI_DSP_API_CONFIG
);
283 MPUI1610_SAVE(EMIFS_CONFIG
);
284 MPUI1610_SAVE(EMIFF_SDRAM_CONFIG
);
288 ARM_SAVE(ARM_IDLECT1
);
289 ARM_SAVE(ARM_IDLECT2
);
290 if (!(cpu_is_omap15xx()))
291 ARM_SAVE(ARM_IDLECT3
);
292 ARM_SAVE(ARM_EWUPCT
);
293 ARM_SAVE(ARM_RSTCT1
);
294 ARM_SAVE(ARM_RSTCT2
);
296 ULPD_SAVE(ULPD_CLOCK_CTRL
);
297 ULPD_SAVE(ULPD_STATUS_REQ
);
299 /* (Step 3 removed - we now allow deep sleep by default) */
302 * Step 4: OMAP DSP Shutdown
306 omap_writew(omap_readw(ARM_RSTCT1
) & ~(1 << DSP_EN
), ARM_RSTCT1
);
308 /* shut down dsp_ck */
309 if (!cpu_is_omap730())
310 omap_writew(omap_readw(ARM_CKCTL
) & ~(1 << EN_DSPCK
), ARM_CKCTL
);
312 /* temporarily enabling api_ck to access DSP registers */
313 omap_writew(omap_readw(ARM_IDLECT2
) | 1 << EN_APICK
, ARM_IDLECT2
);
315 /* save DSP registers */
316 DSP_SAVE(DSP_IDLECT2
);
318 /* Stop all DSP domain clocks */
319 __raw_writew(0, DSP_IDLECT2
);
322 * Step 5: Wakeup Event Setup
325 omap_pm_wakeup_setup();
328 * Step 6: ARM and Traffic controller shutdown
331 /* disable ARM watchdog */
332 omap_writel(0x00F5, OMAP_WDT_TIMER_MODE
);
333 omap_writel(0x00A0, OMAP_WDT_TIMER_MODE
);
336 * Step 6b: ARM and Traffic controller shutdown
338 * Step 6 continues here. Prepare jump to power management
339 * assembly code in internal SRAM.
341 * Since the omap_cpu_suspend routine has been copied to
342 * SRAM, we'll do an indirect procedure call to it and pass the
343 * contents of arm_idlect1 and arm_idlect2 so it can restore
344 * them when it wakes up and it will return.
347 arg0
= arm_sleep_save
[ARM_SLEEP_SAVE_ARM_IDLECT1
];
348 arg1
= arm_sleep_save
[ARM_SLEEP_SAVE_ARM_IDLECT2
];
351 * Step 6c: ARM and Traffic controller shutdown
353 * Jump to assembly code. The processor will stay there
356 omap_sram_suspend(arg0
, arg1
);
359 * If we are here, processor is woken up!
366 /* again temporarily enabling api_ck to access DSP registers */
367 omap_writew(omap_readw(ARM_IDLECT2
) | 1 << EN_APICK
, ARM_IDLECT2
);
369 /* Restore DSP domain clocks */
370 DSP_RESTORE(DSP_IDLECT2
);
373 * Restore ARM state, except ARM_IDLECT1/2 which omap_cpu_suspend did
376 if (!(cpu_is_omap15xx()))
377 ARM_RESTORE(ARM_IDLECT3
);
378 ARM_RESTORE(ARM_CKCTL
);
379 ARM_RESTORE(ARM_EWUPCT
);
380 ARM_RESTORE(ARM_RSTCT1
);
381 ARM_RESTORE(ARM_RSTCT2
);
382 ARM_RESTORE(ARM_SYSST
);
383 ULPD_RESTORE(ULPD_CLOCK_CTRL
);
384 ULPD_RESTORE(ULPD_STATUS_REQ
);
386 if (cpu_is_omap730()) {
387 MPUI730_RESTORE(EMIFS_CONFIG
);
388 MPUI730_RESTORE(EMIFF_SDRAM_CONFIG
);
389 MPUI730_RESTORE(OMAP_IH1_MIR
);
390 MPUI730_RESTORE(OMAP_IH2_0_MIR
);
391 MPUI730_RESTORE(OMAP_IH2_1_MIR
);
392 } else if (cpu_is_omap15xx()) {
393 MPUI1510_RESTORE(MPUI_CTRL
);
394 MPUI1510_RESTORE(MPUI_DSP_BOOT_CONFIG
);
395 MPUI1510_RESTORE(MPUI_DSP_API_CONFIG
);
396 MPUI1510_RESTORE(EMIFS_CONFIG
);
397 MPUI1510_RESTORE(EMIFF_SDRAM_CONFIG
);
398 MPUI1510_RESTORE(OMAP_IH1_MIR
);
399 MPUI1510_RESTORE(OMAP_IH2_MIR
);
400 } else if (cpu_is_omap16xx()) {
401 MPUI1610_RESTORE(MPUI_CTRL
);
402 MPUI1610_RESTORE(MPUI_DSP_BOOT_CONFIG
);
403 MPUI1610_RESTORE(MPUI_DSP_API_CONFIG
);
404 MPUI1610_RESTORE(EMIFS_CONFIG
);
405 MPUI1610_RESTORE(EMIFF_SDRAM_CONFIG
);
407 MPUI1610_RESTORE(OMAP_IH1_MIR
);
408 MPUI1610_RESTORE(OMAP_IH2_0_MIR
);
409 MPUI1610_RESTORE(OMAP_IH2_1_MIR
);
410 MPUI1610_RESTORE(OMAP_IH2_2_MIR
);
411 MPUI1610_RESTORE(OMAP_IH2_3_MIR
);
414 if (!cpu_is_omap15xx())
415 omap_writew(0, ULPD_SOFT_DISABLE_REQ_REG
);
418 * Re-enable interrupts
424 omap_serial_wake_trigger(0);
426 printk(KERN_INFO
"PM: OMAP%x is re-starting from deep sleep...\n",
430 #if defined(DEBUG) && defined(CONFIG_PROC_FS)
431 static int g_read_completed
;
434 * Read system PM registers for debugging
436 static int omap_pm_read_proc(
438 char **my_first_byte
,
444 int my_buffer_offset
= 0;
445 char * const my_base
= page_buffer
;
448 ARM_SAVE(ARM_IDLECT1
);
449 ARM_SAVE(ARM_IDLECT2
);
450 if (!(cpu_is_omap15xx()))
451 ARM_SAVE(ARM_IDLECT3
);
452 ARM_SAVE(ARM_EWUPCT
);
453 ARM_SAVE(ARM_RSTCT1
);
454 ARM_SAVE(ARM_RSTCT2
);
457 ULPD_SAVE(ULPD_IT_STATUS
);
458 ULPD_SAVE(ULPD_CLOCK_CTRL
);
459 ULPD_SAVE(ULPD_SOFT_REQ
);
460 ULPD_SAVE(ULPD_STATUS_REQ
);
461 ULPD_SAVE(ULPD_DPLL_CTRL
);
462 ULPD_SAVE(ULPD_POWER_CTRL
);
464 if (cpu_is_omap730()) {
465 MPUI730_SAVE(MPUI_CTRL
);
466 MPUI730_SAVE(MPUI_DSP_STATUS
);
467 MPUI730_SAVE(MPUI_DSP_BOOT_CONFIG
);
468 MPUI730_SAVE(MPUI_DSP_API_CONFIG
);
469 MPUI730_SAVE(EMIFF_SDRAM_CONFIG
);
470 MPUI730_SAVE(EMIFS_CONFIG
);
471 } else if (cpu_is_omap15xx()) {
472 MPUI1510_SAVE(MPUI_CTRL
);
473 MPUI1510_SAVE(MPUI_DSP_STATUS
);
474 MPUI1510_SAVE(MPUI_DSP_BOOT_CONFIG
);
475 MPUI1510_SAVE(MPUI_DSP_API_CONFIG
);
476 MPUI1510_SAVE(EMIFF_SDRAM_CONFIG
);
477 MPUI1510_SAVE(EMIFS_CONFIG
);
478 } else if (cpu_is_omap16xx()) {
479 MPUI1610_SAVE(MPUI_CTRL
);
480 MPUI1610_SAVE(MPUI_DSP_STATUS
);
481 MPUI1610_SAVE(MPUI_DSP_BOOT_CONFIG
);
482 MPUI1610_SAVE(MPUI_DSP_API_CONFIG
);
483 MPUI1610_SAVE(EMIFF_SDRAM_CONFIG
);
484 MPUI1610_SAVE(EMIFS_CONFIG
);
487 if (virtual_start
== 0) {
488 g_read_completed
= 0;
490 my_buffer_offset
+= sprintf(my_base
+ my_buffer_offset
,
491 "ARM_CKCTL_REG: 0x%-8x \n"
492 "ARM_IDLECT1_REG: 0x%-8x \n"
493 "ARM_IDLECT2_REG: 0x%-8x \n"
494 "ARM_IDLECT3_REG: 0x%-8x \n"
495 "ARM_EWUPCT_REG: 0x%-8x \n"
496 "ARM_RSTCT1_REG: 0x%-8x \n"
497 "ARM_RSTCT2_REG: 0x%-8x \n"
498 "ARM_SYSST_REG: 0x%-8x \n"
499 "ULPD_IT_STATUS_REG: 0x%-4x \n"
500 "ULPD_CLOCK_CTRL_REG: 0x%-4x \n"
501 "ULPD_SOFT_REQ_REG: 0x%-4x \n"
502 "ULPD_DPLL_CTRL_REG: 0x%-4x \n"
503 "ULPD_STATUS_REQ_REG: 0x%-4x \n"
504 "ULPD_POWER_CTRL_REG: 0x%-4x \n",
506 ARM_SHOW(ARM_IDLECT1
),
507 ARM_SHOW(ARM_IDLECT2
),
508 ARM_SHOW(ARM_IDLECT3
),
509 ARM_SHOW(ARM_EWUPCT
),
510 ARM_SHOW(ARM_RSTCT1
),
511 ARM_SHOW(ARM_RSTCT2
),
513 ULPD_SHOW(ULPD_IT_STATUS
),
514 ULPD_SHOW(ULPD_CLOCK_CTRL
),
515 ULPD_SHOW(ULPD_SOFT_REQ
),
516 ULPD_SHOW(ULPD_DPLL_CTRL
),
517 ULPD_SHOW(ULPD_STATUS_REQ
),
518 ULPD_SHOW(ULPD_POWER_CTRL
));
520 if (cpu_is_omap730()) {
521 my_buffer_offset
+= sprintf(my_base
+ my_buffer_offset
,
522 "MPUI730_CTRL_REG 0x%-8x \n"
523 "MPUI730_DSP_STATUS_REG: 0x%-8x \n"
524 "MPUI730_DSP_BOOT_CONFIG_REG: 0x%-8x \n"
525 "MPUI730_DSP_API_CONFIG_REG: 0x%-8x \n"
526 "MPUI730_SDRAM_CONFIG_REG: 0x%-8x \n"
527 "MPUI730_EMIFS_CONFIG_REG: 0x%-8x \n",
528 MPUI730_SHOW(MPUI_CTRL
),
529 MPUI730_SHOW(MPUI_DSP_STATUS
),
530 MPUI730_SHOW(MPUI_DSP_BOOT_CONFIG
),
531 MPUI730_SHOW(MPUI_DSP_API_CONFIG
),
532 MPUI730_SHOW(EMIFF_SDRAM_CONFIG
),
533 MPUI730_SHOW(EMIFS_CONFIG
));
534 } else if (cpu_is_omap15xx()) {
535 my_buffer_offset
+= sprintf(my_base
+ my_buffer_offset
,
536 "MPUI1510_CTRL_REG 0x%-8x \n"
537 "MPUI1510_DSP_STATUS_REG: 0x%-8x \n"
538 "MPUI1510_DSP_BOOT_CONFIG_REG: 0x%-8x \n"
539 "MPUI1510_DSP_API_CONFIG_REG: 0x%-8x \n"
540 "MPUI1510_SDRAM_CONFIG_REG: 0x%-8x \n"
541 "MPUI1510_EMIFS_CONFIG_REG: 0x%-8x \n",
542 MPUI1510_SHOW(MPUI_CTRL
),
543 MPUI1510_SHOW(MPUI_DSP_STATUS
),
544 MPUI1510_SHOW(MPUI_DSP_BOOT_CONFIG
),
545 MPUI1510_SHOW(MPUI_DSP_API_CONFIG
),
546 MPUI1510_SHOW(EMIFF_SDRAM_CONFIG
),
547 MPUI1510_SHOW(EMIFS_CONFIG
));
548 } else if (cpu_is_omap16xx()) {
549 my_buffer_offset
+= sprintf(my_base
+ my_buffer_offset
,
550 "MPUI1610_CTRL_REG 0x%-8x \n"
551 "MPUI1610_DSP_STATUS_REG: 0x%-8x \n"
552 "MPUI1610_DSP_BOOT_CONFIG_REG: 0x%-8x \n"
553 "MPUI1610_DSP_API_CONFIG_REG: 0x%-8x \n"
554 "MPUI1610_SDRAM_CONFIG_REG: 0x%-8x \n"
555 "MPUI1610_EMIFS_CONFIG_REG: 0x%-8x \n",
556 MPUI1610_SHOW(MPUI_CTRL
),
557 MPUI1610_SHOW(MPUI_DSP_STATUS
),
558 MPUI1610_SHOW(MPUI_DSP_BOOT_CONFIG
),
559 MPUI1610_SHOW(MPUI_DSP_API_CONFIG
),
560 MPUI1610_SHOW(EMIFF_SDRAM_CONFIG
),
561 MPUI1610_SHOW(EMIFS_CONFIG
));
565 } else if (g_read_completed
>= 1) {
571 *my_first_byte
= page_buffer
;
572 return my_buffer_offset
;
575 static void omap_pm_init_proc(void)
577 struct proc_dir_entry
*entry
;
579 entry
= create_proc_read_entry("driver/omap_pm",
580 S_IWUSR
| S_IRUGO
, NULL
,
581 omap_pm_read_proc
, NULL
);
584 #endif /* DEBUG && CONFIG_PROC_FS */
586 static void (*saved_idle
)(void) = NULL
;
589 * omap_pm_prepare - Do preliminary suspend work.
592 static int omap_pm_prepare(void)
594 /* We cannot sleep in idle until we have resumed */
595 saved_idle
= pm_idle
;
603 * omap_pm_enter - Actually enter a sleep state.
604 * @state: State we're entering.
608 static int omap_pm_enter(suspend_state_t state
)
612 case PM_SUSPEND_STANDBY
:
625 * omap_pm_finish - Finish up suspend sequence.
627 * This is called after we wake back up (or if entering the sleep state
631 static void omap_pm_finish(void)
633 pm_idle
= saved_idle
;
637 static irqreturn_t
omap_wakeup_interrupt(int irq
, void *dev
)
642 static struct irqaction omap_wakeup_irq
= {
643 .name
= "peripheral wakeup",
644 .flags
= IRQF_DISABLED
,
645 .handler
= omap_wakeup_interrupt
650 static struct platform_suspend_ops omap_pm_ops
={
651 .prepare
= omap_pm_prepare
,
652 .enter
= omap_pm_enter
,
653 .finish
= omap_pm_finish
,
654 .valid
= suspend_valid_only_mem
,
657 static int __init
omap_pm_init(void)
660 #ifdef CONFIG_OMAP_32K_TIMER
664 printk("Power Management for TI OMAP.\n");
667 * We copy the assembler sleep/wakeup routines to SRAM.
668 * These routines need to be in SRAM as that's the only
669 * memory the MPU can see when it wakes up.
671 if (cpu_is_omap730()) {
672 omap_sram_suspend
= omap_sram_push(omap730_cpu_suspend
,
673 omap730_cpu_suspend_sz
);
674 } else if (cpu_is_omap15xx()) {
675 omap_sram_suspend
= omap_sram_push(omap1510_cpu_suspend
,
676 omap1510_cpu_suspend_sz
);
677 } else if (cpu_is_omap16xx()) {
678 omap_sram_suspend
= omap_sram_push(omap1610_cpu_suspend
,
679 omap1610_cpu_suspend_sz
);
682 if (omap_sram_suspend
== NULL
) {
683 printk(KERN_ERR
"PM not initialized: Missing SRAM support\n");
687 pm_idle
= omap1_pm_idle
;
689 if (cpu_is_omap730())
690 setup_irq(INT_730_WAKE_UP_REQ
, &omap_wakeup_irq
);
691 else if (cpu_is_omap16xx())
692 setup_irq(INT_1610_WAKE_UP_REQ
, &omap_wakeup_irq
);
694 /* Program new power ramp-up time
695 * (0 for most boards since we don't lower voltage when in deep sleep)
697 omap_writew(ULPD_SETUP_ANALOG_CELL_3_VAL
, ULPD_SETUP_ANALOG_CELL_3
);
699 /* Setup ULPD POWER_CTRL_REG - enter deep sleep whenever possible */
700 omap_writew(ULPD_POWER_CTRL_REG_VAL
, ULPD_POWER_CTRL
);
702 /* Configure IDLECT3 */
703 if (cpu_is_omap730())
704 omap_writel(OMAP730_IDLECT3_VAL
, OMAP730_IDLECT3
);
705 else if (cpu_is_omap16xx())
706 omap_writel(OMAP1610_IDLECT3_VAL
, OMAP1610_IDLECT3
);
708 suspend_set_ops(&omap_pm_ops
);
710 #if defined(DEBUG) && defined(CONFIG_PROC_FS)
714 #ifdef CONFIG_OMAP_32K_TIMER
715 error
= sysfs_create_file(power_kobj
, &sleep_while_idle_attr
.attr
);
717 printk(KERN_ERR
"sysfs_create_file failed: %d\n", error
);
720 if (cpu_is_omap16xx()) {
721 /* configure LOW_PWR pin */
722 omap_cfg_reg(T20_1610_LOW_PWR
);
727 __initcall(omap_pm_init
);