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/debugfs.h>
41 #include <linux/seq_file.h>
42 #include <linux/interrupt.h>
43 #include <linux/sysfs.h>
44 #include <linux/module.h>
45 #include <linux/io.h>
46 #include <linux/atomic.h>
47 #include <linux/cpu.h>
48
49 #include <asm/fncpy.h>
50 #include <asm/system_misc.h>
51 #include <asm/irq.h>
52 #include <asm/mach/time.h>
53 #include <asm/mach/irq.h>
54
55 #include <linux/soc/ti/omap1-io.h>
56 #include "tc.h"
57 #include <linux/omap-dma.h>
58 #include <clocksource/timer-ti-dm.h>
59
60 #include "hardware.h"
61 #include "mux.h"
62 #include "irqs.h"
63 #include "iomap.h"
64 #include "clock.h"
65 #include "pm.h"
66 #include "soc.h"
67 #include "sram.h"
68
69 static unsigned int arm_sleep_save[ARM_SLEEP_SAVE_SIZE];
70 static unsigned short dsp_sleep_save[DSP_SLEEP_SAVE_SIZE];
71 static unsigned short ulpd_sleep_save[ULPD_SLEEP_SAVE_SIZE];
72 static unsigned int mpui1510_sleep_save[MPUI1510_SLEEP_SAVE_SIZE];
73 static unsigned int mpui1610_sleep_save[MPUI1610_SLEEP_SAVE_SIZE];
74
75 static unsigned short enable_dyn_sleep;
76
idle_show(struct kobject * kobj,struct kobj_attribute * attr,char * buf)77 static ssize_t idle_show(struct kobject *kobj, struct kobj_attribute *attr,
78 char *buf)
79 {
80 return sprintf(buf, "%hu\n", enable_dyn_sleep);
81 }
82
idle_store(struct kobject * kobj,struct kobj_attribute * attr,const char * buf,size_t n)83 static ssize_t idle_store(struct kobject *kobj, struct kobj_attribute *attr,
84 const char * buf, size_t n)
85 {
86 unsigned short value;
87 if (sscanf(buf, "%hu", &value) != 1 ||
88 (value != 0 && value != 1) ||
89 (value != 0 && !IS_ENABLED(CONFIG_OMAP_32K_TIMER))) {
90 pr_err("idle_sleep_store: Invalid value\n");
91 return -EINVAL;
92 }
93 enable_dyn_sleep = value;
94 return n;
95 }
96
97 static struct kobj_attribute sleep_while_idle_attr =
98 __ATTR(sleep_while_idle, 0644, idle_show, idle_store);
99
100
101 static void (*omap_sram_suspend)(unsigned long r0, unsigned long r1) = NULL;
102
103 /*
104 * Let's power down on idle, but only if we are really
105 * idle, because once we start down the path of
106 * going idle we continue to do idle even if we get
107 * a clock tick interrupt . .
108 */
omap1_pm_idle(void)109 void omap1_pm_idle(void)
110 {
111 extern __u32 arm_idlect1_mask;
112 __u32 use_idlect1 = arm_idlect1_mask;
113
114 local_fiq_disable();
115
116 #if defined(CONFIG_OMAP_MPU_TIMER) && !defined(CONFIG_OMAP_DM_TIMER)
117 use_idlect1 = use_idlect1 & ~(1 << 9);
118 #endif
119
120 #ifdef CONFIG_OMAP_DM_TIMER
121 use_idlect1 = omap_dm_timer_modify_idlect_mask(use_idlect1);
122 #endif
123
124 if (omap_dma_running())
125 use_idlect1 &= ~(1 << 6);
126
127 /*
128 * We should be able to remove the do_sleep variable and multiple
129 * tests above as soon as drivers, timer and DMA code have been fixed.
130 * Even the sleep block count should become obsolete.
131 */
132 if ((use_idlect1 != ~0) || !enable_dyn_sleep) {
133
134 __u32 saved_idlect1 = omap_readl(ARM_IDLECT1);
135 if (cpu_is_omap15xx())
136 use_idlect1 &= OMAP1510_BIG_SLEEP_REQUEST;
137 else
138 use_idlect1 &= OMAP1610_IDLECT1_SLEEP_VAL;
139 omap_writel(use_idlect1, ARM_IDLECT1);
140 __asm__ volatile ("mcr p15, 0, r0, c7, c0, 4");
141 omap_writel(saved_idlect1, ARM_IDLECT1);
142
143 local_fiq_enable();
144 return;
145 }
146 omap_sram_suspend(omap_readl(ARM_IDLECT1),
147 omap_readl(ARM_IDLECT2));
148
149 local_fiq_enable();
150 }
151
152 /*
153 * Configuration of the wakeup event is board specific. For the
154 * moment we put it into this helper function. Later it may move
155 * to board specific files.
156 */
omap_pm_wakeup_setup(void)157 static void omap_pm_wakeup_setup(void)
158 {
159 u32 level1_wake = 0;
160 u32 level2_wake = OMAP_IRQ_BIT(INT_UART2);
161
162 /*
163 * Turn off all interrupts except GPIO bank 1, L1-2nd level cascade,
164 * and the L2 wakeup interrupts: keypad and UART2. Note that the
165 * drivers must still separately call omap_set_gpio_wakeup() to
166 * wake up to a GPIO interrupt.
167 */
168 if (cpu_is_omap15xx())
169 level1_wake = OMAP_IRQ_BIT(INT_GPIO_BANK1) |
170 OMAP_IRQ_BIT(INT_1510_IH2_IRQ);
171 else if (cpu_is_omap16xx())
172 level1_wake = OMAP_IRQ_BIT(INT_GPIO_BANK1) |
173 OMAP_IRQ_BIT(INT_1610_IH2_IRQ);
174
175 omap_writel(~level1_wake, OMAP_IH1_MIR);
176
177 if (cpu_is_omap15xx()) {
178 level2_wake |= OMAP_IRQ_BIT(INT_KEYBOARD);
179 omap_writel(~level2_wake, OMAP_IH2_MIR);
180 } else if (cpu_is_omap16xx()) {
181 level2_wake |= OMAP_IRQ_BIT(INT_KEYBOARD);
182 omap_writel(~level2_wake, OMAP_IH2_0_MIR);
183
184 /* INT_1610_WAKE_UP_REQ is needed for GPIO wakeup... */
185 omap_writel(~OMAP_IRQ_BIT(INT_1610_WAKE_UP_REQ),
186 OMAP_IH2_1_MIR);
187 omap_writel(~0x0, OMAP_IH2_2_MIR);
188 omap_writel(~0x0, OMAP_IH2_3_MIR);
189 }
190
191 /* New IRQ agreement, recalculate in cascade order */
192 omap_writel(1, OMAP_IH2_CONTROL);
193 omap_writel(1, OMAP_IH1_CONTROL);
194 }
195
196 #define EN_DSPCK 13 /* ARM_CKCTL */
197 #define EN_APICK 6 /* ARM_IDLECT2 */
198 #define DSP_EN 1 /* ARM_RSTCT1 */
199
omap1_pm_suspend(void)200 void omap1_pm_suspend(void)
201 {
202 unsigned long arg0 = 0, arg1 = 0;
203
204 printk(KERN_INFO "PM: OMAP%x is trying to enter deep sleep...\n",
205 omap_rev());
206
207 omap_serial_wake_trigger(1);
208
209 if (!cpu_is_omap15xx())
210 omap_writew(0xffff, ULPD_SOFT_DISABLE_REQ_REG);
211
212 /*
213 * Step 1: turn off interrupts (FIXME: NOTE: already disabled)
214 */
215
216 local_irq_disable();
217 local_fiq_disable();
218
219 /*
220 * Step 2: save registers
221 *
222 * The omap is a strange/beautiful device. The caches, memory
223 * and register state are preserved across power saves.
224 * We have to save and restore very little register state to
225 * idle the omap.
226 *
227 * Save interrupt, MPUI, ARM and UPLD control registers.
228 */
229
230 if (cpu_is_omap15xx()) {
231 MPUI1510_SAVE(OMAP_IH1_MIR);
232 MPUI1510_SAVE(OMAP_IH2_MIR);
233 MPUI1510_SAVE(MPUI_CTRL);
234 MPUI1510_SAVE(MPUI_DSP_BOOT_CONFIG);
235 MPUI1510_SAVE(MPUI_DSP_API_CONFIG);
236 MPUI1510_SAVE(EMIFS_CONFIG);
237 MPUI1510_SAVE(EMIFF_SDRAM_CONFIG);
238 } else if (cpu_is_omap16xx()) {
239 MPUI1610_SAVE(OMAP_IH1_MIR);
240 MPUI1610_SAVE(OMAP_IH2_0_MIR);
241 MPUI1610_SAVE(OMAP_IH2_1_MIR);
242 MPUI1610_SAVE(OMAP_IH2_2_MIR);
243 MPUI1610_SAVE(OMAP_IH2_3_MIR);
244 MPUI1610_SAVE(MPUI_CTRL);
245 MPUI1610_SAVE(MPUI_DSP_BOOT_CONFIG);
246 MPUI1610_SAVE(MPUI_DSP_API_CONFIG);
247 MPUI1610_SAVE(EMIFS_CONFIG);
248 MPUI1610_SAVE(EMIFF_SDRAM_CONFIG);
249 }
250
251 ARM_SAVE(ARM_CKCTL);
252 ARM_SAVE(ARM_IDLECT1);
253 ARM_SAVE(ARM_IDLECT2);
254 if (!(cpu_is_omap15xx()))
255 ARM_SAVE(ARM_IDLECT3);
256 ARM_SAVE(ARM_EWUPCT);
257 ARM_SAVE(ARM_RSTCT1);
258 ARM_SAVE(ARM_RSTCT2);
259 ARM_SAVE(ARM_SYSST);
260 ULPD_SAVE(ULPD_CLOCK_CTRL);
261 ULPD_SAVE(ULPD_STATUS_REQ);
262
263 /* (Step 3 removed - we now allow deep sleep by default) */
264
265 /*
266 * Step 4: OMAP DSP Shutdown
267 */
268
269 /* stop DSP */
270 omap_writew(omap_readw(ARM_RSTCT1) & ~(1 << DSP_EN), ARM_RSTCT1);
271
272 /* shut down dsp_ck */
273 omap_writew(omap_readw(ARM_CKCTL) & ~(1 << EN_DSPCK), ARM_CKCTL);
274
275 /* temporarily enabling api_ck to access DSP registers */
276 omap_writew(omap_readw(ARM_IDLECT2) | 1 << EN_APICK, ARM_IDLECT2);
277
278 /* save DSP registers */
279 DSP_SAVE(DSP_IDLECT2);
280
281 /* Stop all DSP domain clocks */
282 __raw_writew(0, DSP_IDLECT2);
283
284 /*
285 * Step 5: Wakeup Event Setup
286 */
287
288 omap_pm_wakeup_setup();
289
290 /*
291 * Step 6: ARM and Traffic controller shutdown
292 */
293
294 /* disable ARM watchdog */
295 omap_writel(0x00F5, OMAP_WDT_TIMER_MODE);
296 omap_writel(0x00A0, OMAP_WDT_TIMER_MODE);
297
298 /*
299 * Step 6b: ARM and Traffic controller shutdown
300 *
301 * Step 6 continues here. Prepare jump to power management
302 * assembly code in internal SRAM.
303 *
304 * Since the omap_cpu_suspend routine has been copied to
305 * SRAM, we'll do an indirect procedure call to it and pass the
306 * contents of arm_idlect1 and arm_idlect2 so it can restore
307 * them when it wakes up and it will return.
308 */
309
310 arg0 = arm_sleep_save[ARM_SLEEP_SAVE_ARM_IDLECT1];
311 arg1 = arm_sleep_save[ARM_SLEEP_SAVE_ARM_IDLECT2];
312
313 /*
314 * Step 6c: ARM and Traffic controller shutdown
315 *
316 * Jump to assembly code. The processor will stay there
317 * until wake up.
318 */
319 omap_sram_suspend(arg0, arg1);
320
321 /*
322 * If we are here, processor is woken up!
323 */
324
325 /*
326 * Restore DSP clocks
327 */
328
329 /* again temporarily enabling api_ck to access DSP registers */
330 omap_writew(omap_readw(ARM_IDLECT2) | 1 << EN_APICK, ARM_IDLECT2);
331
332 /* Restore DSP domain clocks */
333 DSP_RESTORE(DSP_IDLECT2);
334
335 /*
336 * Restore ARM state, except ARM_IDLECT1/2 which omap_cpu_suspend did
337 */
338
339 if (!(cpu_is_omap15xx()))
340 ARM_RESTORE(ARM_IDLECT3);
341 ARM_RESTORE(ARM_CKCTL);
342 ARM_RESTORE(ARM_EWUPCT);
343 ARM_RESTORE(ARM_RSTCT1);
344 ARM_RESTORE(ARM_RSTCT2);
345 ARM_RESTORE(ARM_SYSST);
346 ULPD_RESTORE(ULPD_CLOCK_CTRL);
347 ULPD_RESTORE(ULPD_STATUS_REQ);
348
349 if (cpu_is_omap15xx()) {
350 MPUI1510_RESTORE(MPUI_CTRL);
351 MPUI1510_RESTORE(MPUI_DSP_BOOT_CONFIG);
352 MPUI1510_RESTORE(MPUI_DSP_API_CONFIG);
353 MPUI1510_RESTORE(EMIFS_CONFIG);
354 MPUI1510_RESTORE(EMIFF_SDRAM_CONFIG);
355 MPUI1510_RESTORE(OMAP_IH1_MIR);
356 MPUI1510_RESTORE(OMAP_IH2_MIR);
357 } else if (cpu_is_omap16xx()) {
358 MPUI1610_RESTORE(MPUI_CTRL);
359 MPUI1610_RESTORE(MPUI_DSP_BOOT_CONFIG);
360 MPUI1610_RESTORE(MPUI_DSP_API_CONFIG);
361 MPUI1610_RESTORE(EMIFS_CONFIG);
362 MPUI1610_RESTORE(EMIFF_SDRAM_CONFIG);
363
364 MPUI1610_RESTORE(OMAP_IH1_MIR);
365 MPUI1610_RESTORE(OMAP_IH2_0_MIR);
366 MPUI1610_RESTORE(OMAP_IH2_1_MIR);
367 MPUI1610_RESTORE(OMAP_IH2_2_MIR);
368 MPUI1610_RESTORE(OMAP_IH2_3_MIR);
369 }
370
371 if (!cpu_is_omap15xx())
372 omap_writew(0, ULPD_SOFT_DISABLE_REQ_REG);
373
374 /*
375 * Re-enable interrupts
376 */
377
378 local_irq_enable();
379 local_fiq_enable();
380
381 omap_serial_wake_trigger(0);
382
383 printk(KERN_INFO "PM: OMAP%x is re-starting from deep sleep...\n",
384 omap_rev());
385 }
386
387 #ifdef CONFIG_DEBUG_FS
388 /*
389 * Read system PM registers for debugging
390 */
omap_pm_debug_show(struct seq_file * m,void * v)391 static int omap_pm_debug_show(struct seq_file *m, void *v)
392 {
393 ARM_SAVE(ARM_CKCTL);
394 ARM_SAVE(ARM_IDLECT1);
395 ARM_SAVE(ARM_IDLECT2);
396 if (!(cpu_is_omap15xx()))
397 ARM_SAVE(ARM_IDLECT3);
398 ARM_SAVE(ARM_EWUPCT);
399 ARM_SAVE(ARM_RSTCT1);
400 ARM_SAVE(ARM_RSTCT2);
401 ARM_SAVE(ARM_SYSST);
402
403 ULPD_SAVE(ULPD_IT_STATUS);
404 ULPD_SAVE(ULPD_CLOCK_CTRL);
405 ULPD_SAVE(ULPD_SOFT_REQ);
406 ULPD_SAVE(ULPD_STATUS_REQ);
407 ULPD_SAVE(ULPD_DPLL_CTRL);
408 ULPD_SAVE(ULPD_POWER_CTRL);
409
410 if (cpu_is_omap15xx()) {
411 MPUI1510_SAVE(MPUI_CTRL);
412 MPUI1510_SAVE(MPUI_DSP_STATUS);
413 MPUI1510_SAVE(MPUI_DSP_BOOT_CONFIG);
414 MPUI1510_SAVE(MPUI_DSP_API_CONFIG);
415 MPUI1510_SAVE(EMIFF_SDRAM_CONFIG);
416 MPUI1510_SAVE(EMIFS_CONFIG);
417 } else if (cpu_is_omap16xx()) {
418 MPUI1610_SAVE(MPUI_CTRL);
419 MPUI1610_SAVE(MPUI_DSP_STATUS);
420 MPUI1610_SAVE(MPUI_DSP_BOOT_CONFIG);
421 MPUI1610_SAVE(MPUI_DSP_API_CONFIG);
422 MPUI1610_SAVE(EMIFF_SDRAM_CONFIG);
423 MPUI1610_SAVE(EMIFS_CONFIG);
424 }
425
426 seq_printf(m,
427 "ARM_CKCTL_REG: 0x%-8x \n"
428 "ARM_IDLECT1_REG: 0x%-8x \n"
429 "ARM_IDLECT2_REG: 0x%-8x \n"
430 "ARM_IDLECT3_REG: 0x%-8x \n"
431 "ARM_EWUPCT_REG: 0x%-8x \n"
432 "ARM_RSTCT1_REG: 0x%-8x \n"
433 "ARM_RSTCT2_REG: 0x%-8x \n"
434 "ARM_SYSST_REG: 0x%-8x \n"
435 "ULPD_IT_STATUS_REG: 0x%-4x \n"
436 "ULPD_CLOCK_CTRL_REG: 0x%-4x \n"
437 "ULPD_SOFT_REQ_REG: 0x%-4x \n"
438 "ULPD_DPLL_CTRL_REG: 0x%-4x \n"
439 "ULPD_STATUS_REQ_REG: 0x%-4x \n"
440 "ULPD_POWER_CTRL_REG: 0x%-4x \n",
441 ARM_SHOW(ARM_CKCTL),
442 ARM_SHOW(ARM_IDLECT1),
443 ARM_SHOW(ARM_IDLECT2),
444 ARM_SHOW(ARM_IDLECT3),
445 ARM_SHOW(ARM_EWUPCT),
446 ARM_SHOW(ARM_RSTCT1),
447 ARM_SHOW(ARM_RSTCT2),
448 ARM_SHOW(ARM_SYSST),
449 ULPD_SHOW(ULPD_IT_STATUS),
450 ULPD_SHOW(ULPD_CLOCK_CTRL),
451 ULPD_SHOW(ULPD_SOFT_REQ),
452 ULPD_SHOW(ULPD_DPLL_CTRL),
453 ULPD_SHOW(ULPD_STATUS_REQ),
454 ULPD_SHOW(ULPD_POWER_CTRL));
455
456 if (cpu_is_omap15xx()) {
457 seq_printf(m,
458 "MPUI1510_CTRL_REG 0x%-8x \n"
459 "MPUI1510_DSP_STATUS_REG: 0x%-8x \n"
460 "MPUI1510_DSP_BOOT_CONFIG_REG: 0x%-8x \n"
461 "MPUI1510_DSP_API_CONFIG_REG: 0x%-8x \n"
462 "MPUI1510_SDRAM_CONFIG_REG: 0x%-8x \n"
463 "MPUI1510_EMIFS_CONFIG_REG: 0x%-8x \n",
464 MPUI1510_SHOW(MPUI_CTRL),
465 MPUI1510_SHOW(MPUI_DSP_STATUS),
466 MPUI1510_SHOW(MPUI_DSP_BOOT_CONFIG),
467 MPUI1510_SHOW(MPUI_DSP_API_CONFIG),
468 MPUI1510_SHOW(EMIFF_SDRAM_CONFIG),
469 MPUI1510_SHOW(EMIFS_CONFIG));
470 } else if (cpu_is_omap16xx()) {
471 seq_printf(m,
472 "MPUI1610_CTRL_REG 0x%-8x \n"
473 "MPUI1610_DSP_STATUS_REG: 0x%-8x \n"
474 "MPUI1610_DSP_BOOT_CONFIG_REG: 0x%-8x \n"
475 "MPUI1610_DSP_API_CONFIG_REG: 0x%-8x \n"
476 "MPUI1610_SDRAM_CONFIG_REG: 0x%-8x \n"
477 "MPUI1610_EMIFS_CONFIG_REG: 0x%-8x \n",
478 MPUI1610_SHOW(MPUI_CTRL),
479 MPUI1610_SHOW(MPUI_DSP_STATUS),
480 MPUI1610_SHOW(MPUI_DSP_BOOT_CONFIG),
481 MPUI1610_SHOW(MPUI_DSP_API_CONFIG),
482 MPUI1610_SHOW(EMIFF_SDRAM_CONFIG),
483 MPUI1610_SHOW(EMIFS_CONFIG));
484 }
485
486 return 0;
487 }
488
489 DEFINE_SHOW_ATTRIBUTE(omap_pm_debug);
490
omap_pm_init_debugfs(void)491 static void omap_pm_init_debugfs(void)
492 {
493 struct dentry *d;
494
495 d = debugfs_create_dir("pm_debug", NULL);
496 debugfs_create_file("omap_pm", S_IWUSR | S_IRUGO, d, NULL,
497 &omap_pm_debug_fops);
498 }
499
500 #endif /* CONFIG_DEBUG_FS */
501
502 /*
503 * omap_pm_prepare - Do preliminary suspend work.
504 *
505 */
omap_pm_prepare(void)506 static int omap_pm_prepare(void)
507 {
508 /* We cannot sleep in idle until we have resumed */
509 cpu_idle_poll_ctrl(true);
510 return 0;
511 }
512
513
514 /*
515 * omap_pm_enter - Actually enter a sleep state.
516 * @state: State we're entering.
517 *
518 */
519
omap_pm_enter(suspend_state_t state)520 static int omap_pm_enter(suspend_state_t state)
521 {
522 switch (state)
523 {
524 case PM_SUSPEND_MEM:
525 omap1_pm_suspend();
526 break;
527 default:
528 return -EINVAL;
529 }
530
531 return 0;
532 }
533
534
535 /**
536 * omap_pm_finish - Finish up suspend sequence.
537 *
538 * This is called after we wake back up (or if entering the sleep state
539 * failed).
540 */
541
omap_pm_finish(void)542 static void omap_pm_finish(void)
543 {
544 cpu_idle_poll_ctrl(false);
545 }
546
547
omap_wakeup_interrupt(int irq,void * dev)548 static irqreturn_t omap_wakeup_interrupt(int irq, void *dev)
549 {
550 return IRQ_HANDLED;
551 }
552
553
554
555 static const struct platform_suspend_ops omap_pm_ops = {
556 .prepare = omap_pm_prepare,
557 .enter = omap_pm_enter,
558 .finish = omap_pm_finish,
559 .valid = suspend_valid_only_mem,
560 };
561
omap_pm_init(void)562 static int __init omap_pm_init(void)
563 {
564 int error = 0;
565 int irq;
566
567 if (!cpu_class_is_omap1())
568 return -ENODEV;
569
570 pr_info("Power Management for TI OMAP.\n");
571
572 if (!IS_ENABLED(CONFIG_OMAP_32K_TIMER))
573 pr_info("OMAP1 PM: sleep states in idle disabled due to no 32KiHz timer\n");
574
575 if (!IS_ENABLED(CONFIG_OMAP_DM_TIMER))
576 pr_info("OMAP1 PM: sleep states in idle disabled due to no DMTIMER support\n");
577
578 if (IS_ENABLED(CONFIG_OMAP_32K_TIMER) &&
579 IS_ENABLED(CONFIG_OMAP_DM_TIMER)) {
580 /* OMAP16xx only */
581 pr_info("OMAP1 PM: sleep states in idle enabled\n");
582 enable_dyn_sleep = 1;
583 }
584
585 /*
586 * We copy the assembler sleep/wakeup routines to SRAM.
587 * These routines need to be in SRAM as that's the only
588 * memory the MPU can see when it wakes up.
589 */
590 if (cpu_is_omap15xx()) {
591 omap_sram_suspend = omap_sram_push(omap1510_cpu_suspend,
592 omap1510_cpu_suspend_sz);
593 } else if (cpu_is_omap16xx()) {
594 omap_sram_suspend = omap_sram_push(omap1610_cpu_suspend,
595 omap1610_cpu_suspend_sz);
596 }
597
598 if (omap_sram_suspend == NULL) {
599 printk(KERN_ERR "PM not initialized: Missing SRAM support\n");
600 return -ENODEV;
601 }
602
603 arm_pm_idle = omap1_pm_idle;
604
605 if (cpu_is_omap16xx())
606 irq = INT_1610_WAKE_UP_REQ;
607 else
608 irq = -1;
609
610 if (irq >= 0) {
611 if (request_irq(irq, omap_wakeup_interrupt, 0, "peripheral wakeup", NULL))
612 pr_err("Failed to request irq %d (peripheral wakeup)\n", irq);
613 }
614
615 /* Program new power ramp-up time
616 * (0 for most boards since we don't lower voltage when in deep sleep)
617 */
618 omap_writew(ULPD_SETUP_ANALOG_CELL_3_VAL, ULPD_SETUP_ANALOG_CELL_3);
619
620 /* Setup ULPD POWER_CTRL_REG - enter deep sleep whenever possible */
621 omap_writew(ULPD_POWER_CTRL_REG_VAL, ULPD_POWER_CTRL);
622
623 /* Configure IDLECT3 */
624 if (cpu_is_omap16xx())
625 omap_writel(OMAP1610_IDLECT3_VAL, OMAP1610_IDLECT3);
626
627 suspend_set_ops(&omap_pm_ops);
628
629 #ifdef CONFIG_DEBUG_FS
630 omap_pm_init_debugfs();
631 #endif
632
633 error = sysfs_create_file(power_kobj, &sleep_while_idle_attr.attr);
634 if (error)
635 pr_err("sysfs_create_file failed: %d\n", error);
636
637 if (cpu_is_omap16xx()) {
638 /* configure LOW_PWR pin */
639 omap_cfg_reg(T20_1610_LOW_PWR);
640 }
641
642 return error;
643 }
644 __initcall(omap_pm_init);
645
