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Linux 3.3.2
[zen-stable.git] / arch / arm / mach-omap1 / pm.c
blob89ea20ca0cccbc02c0ccba365547942e8c41ea93
1 /*
2 * linux/arch/arm/mach-omap1/pm.c
3 *
4 * OMAP Power Management Routines
5 *
6 * Original code for the SA11x0:
7 * Copyright (c) 2001 Cliff Brake <cbrake@accelent.com>
8 *
9 * Modified for the PXA250 by Nicolas Pitre:
10 * Copyright (c) 2002 Monta Vista Software, Inc.
11 *
12 * Modified for the OMAP1510 by David Singleton:
13 * Copyright (c) 2002 Monta Vista Software, Inc.
14 *
15 * Cleanup 2004 for OMAP1510/1610 by Dirk Behme <dirk.behme@de.bosch.com>
16 *
17 * This program is free software; you can redistribute it and/or modify it
18 * under the terms of the GNU General Public License as published by the
19 * Free Software Foundation; either version 2 of the License, or (at your
20 * option) any later version.
21 *
22 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
23 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
24 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
25 * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
26 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
27 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
28 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
29 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
31 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32 *
33 * You should have received a copy of the GNU General Public License along
34 * with this program; if not, write to the Free Software Foundation, Inc.,
35 * 675 Mass Ave, Cambridge, MA 02139, USA.
36 */
37
38 #include <linux/suspend.h>
39 #include <linux/sched.h>
40 #include <linux/proc_fs.h>
41 #include <linux/interrupt.h>
42 #include <linux/sysfs.h>
43 #include <linux/module.h>
44 #include <linux/io.h>
45
46 #include <asm/irq.h>
47 #include <linux/atomic.h>
48 #include <asm/mach/time.h>
49 #include <asm/mach/irq.h>
50
51 #include <plat/cpu.h>
52 #include <mach/irqs.h>
53 #include <plat/clock.h>
54 #include <plat/sram.h>
55 #include <plat/tc.h>
56 #include <plat/mux.h>
57 #include <plat/dma.h>
58 #include <plat/dmtimer.h>
59
60 #include "pm.h"
61
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 mpui7xx_sleep_save[MPUI7XX_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];
68
69 #ifdef CONFIG_OMAP_32K_TIMER
70
71 static unsigned short enable_dyn_sleep = 1;
72
73 static ssize_t idle_show(struct kobject *kobj, struct kobj_attribute *attr,
74 char *buf)
75 {
76 return sprintf(buf, "%hu\n", enable_dyn_sleep);
77 }
78
79 static ssize_t idle_store(struct kobject *kobj, struct kobj_attribute *attr,
80 const char * buf, size_t n)
81 {
82 unsigned short value;
83 if (sscanf(buf, "%hu", &value) != 1 ||
84 (value != 0 && value != 1)) {
85 printk(KERN_ERR "idle_sleep_store: Invalid value\n");
86 return -EINVAL;
87 }
88 enable_dyn_sleep = value;
89 return n;
90 }
91
92 static struct kobj_attribute sleep_while_idle_attr =
93 __ATTR(sleep_while_idle, 0644, idle_show, idle_store);
94
95 #endif
96
97 static void (*omap_sram_suspend)(unsigned long r0, unsigned long r1) = NULL;
98
99 /*
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 . .
104 */
105 void omap1_pm_idle(void)
106 {
107 extern __u32 arm_idlect1_mask;
108 __u32 use_idlect1 = arm_idlect1_mask;
109 int do_sleep = 0;
110
111 local_irq_disable();
112 local_fiq_disable();
113 if (need_resched()) {
114 local_fiq_enable();
115 local_irq_enable();
116 return;
117 }
118
119 #if defined(CONFIG_OMAP_MPU_TIMER) && !defined(CONFIG_OMAP_DM_TIMER)
120 #warning Enable 32kHz OS timer in order to allow sleep states in idle
121 use_idlect1 = use_idlect1 & ~(1 << 9);
122 #else
123
124 while (enable_dyn_sleep) {
125
126 #ifdef CONFIG_CBUS_TAHVO_USB
127 extern int vbus_active;
128 /* Clock requirements? */
129 if (vbus_active)
130 break;
131 #endif
132 do_sleep = 1;
133 break;
134 }
135
136 #endif
137
138 #ifdef CONFIG_OMAP_DM_TIMER
139 use_idlect1 = omap_dm_timer_modify_idlect_mask(use_idlect1);
140 #endif
141
142 if (omap_dma_running())
143 use_idlect1 &= ~(1 << 6);
144
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) {
149
150 __u32 saved_idlect1 = omap_readl(ARM_IDLECT1);
151 if (cpu_is_omap15xx())
152 use_idlect1 &= OMAP1510_BIG_SLEEP_REQUEST;
153 else
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);
158
159 local_fiq_enable();
160 local_irq_enable();
161 return;
162 }
163 omap_sram_suspend(omap_readl(ARM_IDLECT1),
164 omap_readl(ARM_IDLECT2));
165
166 local_fiq_enable();
167 local_irq_enable();
168 }
169
170 /*
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.
174 */
175 static void omap_pm_wakeup_setup(void)
176 {
177 u32 level1_wake = 0;
178 u32 level2_wake = OMAP_IRQ_BIT(INT_UART2);
179
180 /*
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.
185 */
186 if (cpu_is_omap7xx())
187 level1_wake = OMAP_IRQ_BIT(INT_7XX_GPIO_BANK1) |
188 OMAP_IRQ_BIT(INT_7XX_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);
195
196 omap_writel(~level1_wake, OMAP_IH1_MIR);
197
198 if (cpu_is_omap7xx()) {
199 omap_writel(~level2_wake, OMAP_IH2_0_MIR);
200 omap_writel(~(OMAP_IRQ_BIT(INT_7XX_WAKE_UP_REQ) |
201 OMAP_IRQ_BIT(INT_7XX_MPUIO_KEYPAD)),
202 OMAP_IH2_1_MIR);
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);
209
210 /* INT_1610_WAKE_UP_REQ is needed for GPIO wakeup... */
211 omap_writel(~OMAP_IRQ_BIT(INT_1610_WAKE_UP_REQ),
212 OMAP_IH2_1_MIR);
213 omap_writel(~0x0, OMAP_IH2_2_MIR);
214 omap_writel(~0x0, OMAP_IH2_3_MIR);
215 }
216
217 /* New IRQ agreement, recalculate in cascade order */
218 omap_writel(1, OMAP_IH2_CONTROL);
219 omap_writel(1, OMAP_IH1_CONTROL);
220 }
221
222 #define EN_DSPCK 13 /* ARM_CKCTL */
223 #define EN_APICK 6 /* ARM_IDLECT2 */
224 #define DSP_EN 1 /* ARM_RSTCT1 */
225
226 void omap1_pm_suspend(void)
227 {
228 unsigned long arg0 = 0, arg1 = 0;
229
230 printk(KERN_INFO "PM: OMAP%x is trying to enter deep sleep...\n",
231 omap_rev());
232
233 omap_serial_wake_trigger(1);
234
235 if (!cpu_is_omap15xx())
236 omap_writew(0xffff, ULPD_SOFT_DISABLE_REQ_REG);
237
238 /*
239 * Step 1: turn off interrupts (FIXME: NOTE: already disabled)
240 */
241
242 local_irq_disable();
243 local_fiq_disable();
244
245 /*
246 * Step 2: save registers
247 *
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
251 * idle the omap.
252 *
253 * Save interrupt, MPUI, ARM and UPLD control registers.
254 */
255
256 if (cpu_is_omap7xx()) {
257 MPUI7XX_SAVE(OMAP_IH1_MIR);
258 MPUI7XX_SAVE(OMAP_IH2_0_MIR);
259 MPUI7XX_SAVE(OMAP_IH2_1_MIR);
260 MPUI7XX_SAVE(MPUI_CTRL);
261 MPUI7XX_SAVE(MPUI_DSP_BOOT_CONFIG);
262 MPUI7XX_SAVE(MPUI_DSP_API_CONFIG);
263 MPUI7XX_SAVE(EMIFS_CONFIG);
264 MPUI7XX_SAVE(EMIFF_SDRAM_CONFIG);
265
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);
285 }
286
287 ARM_SAVE(ARM_CKCTL);
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);
295 ARM_SAVE(ARM_SYSST);
296 ULPD_SAVE(ULPD_CLOCK_CTRL);
297 ULPD_SAVE(ULPD_STATUS_REQ);
298
299 /* (Step 3 removed - we now allow deep sleep by default) */
300
301 /*
302 * Step 4: OMAP DSP Shutdown
303 */
304
305 /* stop DSP */
306 omap_writew(omap_readw(ARM_RSTCT1) & ~(1 << DSP_EN), ARM_RSTCT1);
307
308 /* shut down dsp_ck */
309 if (!cpu_is_omap7xx())
310 omap_writew(omap_readw(ARM_CKCTL) & ~(1 << EN_DSPCK), ARM_CKCTL);
311
312 /* temporarily enabling api_ck to access DSP registers */
313 omap_writew(omap_readw(ARM_IDLECT2) | 1 << EN_APICK, ARM_IDLECT2);
314
315 /* save DSP registers */
316 DSP_SAVE(DSP_IDLECT2);
317
318 /* Stop all DSP domain clocks */
319 __raw_writew(0, DSP_IDLECT2);
320
321 /*
322 * Step 5: Wakeup Event Setup
323 */
324
325 omap_pm_wakeup_setup();
326
327 /*
328 * Step 6: ARM and Traffic controller shutdown
329 */
330
331 /* disable ARM watchdog */
332 omap_writel(0x00F5, OMAP_WDT_TIMER_MODE);
333 omap_writel(0x00A0, OMAP_WDT_TIMER_MODE);
334
335 /*
336 * Step 6b: ARM and Traffic controller shutdown
337 *
338 * Step 6 continues here. Prepare jump to power management
339 * assembly code in internal SRAM.
340 *
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.
345 */
346
347 arg0 = arm_sleep_save[ARM_SLEEP_SAVE_ARM_IDLECT1];
348 arg1 = arm_sleep_save[ARM_SLEEP_SAVE_ARM_IDLECT2];
349
350 /*
351 * Step 6c: ARM and Traffic controller shutdown
352 *
353 * Jump to assembly code. The processor will stay there
354 * until wake up.
355 */
356 omap_sram_suspend(arg0, arg1);
357
358 /*
359 * If we are here, processor is woken up!
360 */
361
362 /*
363 * Restore DSP clocks
364 */
365
366 /* again temporarily enabling api_ck to access DSP registers */
367 omap_writew(omap_readw(ARM_IDLECT2) | 1 << EN_APICK, ARM_IDLECT2);
368
369 /* Restore DSP domain clocks */
370 DSP_RESTORE(DSP_IDLECT2);
371
372 /*
373 * Restore ARM state, except ARM_IDLECT1/2 which omap_cpu_suspend did
374 */
375
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);
385
386 if (cpu_is_omap7xx()) {
387 MPUI7XX_RESTORE(EMIFS_CONFIG);
388 MPUI7XX_RESTORE(EMIFF_SDRAM_CONFIG);
389 MPUI7XX_RESTORE(OMAP_IH1_MIR);
390 MPUI7XX_RESTORE(OMAP_IH2_0_MIR);
391 MPUI7XX_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);
406
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);
412 }
413
414 if (!cpu_is_omap15xx())
415 omap_writew(0, ULPD_SOFT_DISABLE_REQ_REG);
416
417 /*
418 * Re-enable interrupts
419 */
420
421 local_irq_enable();
422 local_fiq_enable();
423
424 omap_serial_wake_trigger(0);
425
426 printk(KERN_INFO "PM: OMAP%x is re-starting from deep sleep...\n",
427 omap_rev());
428 }
429
430 #if defined(DEBUG) && defined(CONFIG_PROC_FS)
431 static int g_read_completed;
432
433 /*
434 * Read system PM registers for debugging
435 */
436 static int omap_pm_read_proc(
437 char *page_buffer,
438 char **my_first_byte,
439 off_t virtual_start,
440 int length,
441 int *eof,
442 void *data)
443 {
444 int my_buffer_offset = 0;
445 char * const my_base = page_buffer;
446
447 ARM_SAVE(ARM_CKCTL);
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);
455 ARM_SAVE(ARM_SYSST);
456
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);
463
464 if (cpu_is_omap7xx()) {
465 MPUI7XX_SAVE(MPUI_CTRL);
466 MPUI7XX_SAVE(MPUI_DSP_STATUS);
467 MPUI7XX_SAVE(MPUI_DSP_BOOT_CONFIG);
468 MPUI7XX_SAVE(MPUI_DSP_API_CONFIG);
469 MPUI7XX_SAVE(EMIFF_SDRAM_CONFIG);
470 MPUI7XX_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);
485 }
486
487 if (virtual_start == 0) {
488 g_read_completed = 0;
489
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",
505 ARM_SHOW(ARM_CKCTL),
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),
512 ARM_SHOW(ARM_SYSST),
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));
519
520 if (cpu_is_omap7xx()) {
521 my_buffer_offset += sprintf(my_base + my_buffer_offset,
522 "MPUI7XX_CTRL_REG 0x%-8x \n"
523 "MPUI7XX_DSP_STATUS_REG: 0x%-8x \n"
524 "MPUI7XX_DSP_BOOT_CONFIG_REG: 0x%-8x \n"
525 "MPUI7XX_DSP_API_CONFIG_REG: 0x%-8x \n"
526 "MPUI7XX_SDRAM_CONFIG_REG: 0x%-8x \n"
527 "MPUI7XX_EMIFS_CONFIG_REG: 0x%-8x \n",
528 MPUI7XX_SHOW(MPUI_CTRL),
529 MPUI7XX_SHOW(MPUI_DSP_STATUS),
530 MPUI7XX_SHOW(MPUI_DSP_BOOT_CONFIG),
531 MPUI7XX_SHOW(MPUI_DSP_API_CONFIG),
532 MPUI7XX_SHOW(EMIFF_SDRAM_CONFIG),
533 MPUI7XX_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));
562 }
563
564 g_read_completed++;
565 } else if (g_read_completed >= 1) {
566 *eof = 1;
567 return 0;
568 }
569 g_read_completed++;
570
571 *my_first_byte = page_buffer;
572 return my_buffer_offset;
573 }
574
575 static void omap_pm_init_proc(void)
576 {
577 struct proc_dir_entry *entry;
578
579 entry = create_proc_read_entry("driver/omap_pm",
580 S_IWUSR | S_IRUGO, NULL,
581 omap_pm_read_proc, NULL);
582 }
583
584 #endif /* DEBUG && CONFIG_PROC_FS */
585
586 static void (*saved_idle)(void) = NULL;
587
588 /*
589 * omap_pm_prepare - Do preliminary suspend work.
590 *
591 */
592 static int omap_pm_prepare(void)
593 {
594 /* We cannot sleep in idle until we have resumed */
595 saved_idle = pm_idle;
596 pm_idle = NULL;
597
598 return 0;
599 }
600
601
602 /*
603 * omap_pm_enter - Actually enter a sleep state.
604 * @state: State we're entering.
605 *
606 */
607
608 static int omap_pm_enter(suspend_state_t state)
609 {
610 switch (state)
611 {
612 case PM_SUSPEND_STANDBY:
613 case PM_SUSPEND_MEM:
614 omap1_pm_suspend();
615 break;
616 default:
617 return -EINVAL;
618 }
619
620 return 0;
621 }
622
623
624 /**
625 * omap_pm_finish - Finish up suspend sequence.
626 *
627 * This is called after we wake back up (or if entering the sleep state
628 * failed).
629 */
630
631 static void omap_pm_finish(void)
632 {
633 pm_idle = saved_idle;
634 }
635
636
637 static irqreturn_t omap_wakeup_interrupt(int irq, void *dev)
638 {
639 return IRQ_HANDLED;
640 }
641
642 static struct irqaction omap_wakeup_irq = {
643 .name = "peripheral wakeup",
644 .flags = IRQF_DISABLED,
645 .handler = omap_wakeup_interrupt
646 };
647
648
649
650 static const 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,
655 };
656
657 static int __init omap_pm_init(void)
658 {
659
660 #ifdef CONFIG_OMAP_32K_TIMER
661 int error;
662 #endif
663
664 if (!cpu_class_is_omap1())
665 return -ENODEV;
666
667 printk("Power Management for TI OMAP.\n");
668
669 /*
670 * We copy the assembler sleep/wakeup routines to SRAM.
671 * These routines need to be in SRAM as that's the only
672 * memory the MPU can see when it wakes up.
673 */
674 if (cpu_is_omap7xx()) {
675 omap_sram_suspend = omap_sram_push(omap7xx_cpu_suspend,
676 omap7xx_cpu_suspend_sz);
677 } else if (cpu_is_omap15xx()) {
678 omap_sram_suspend = omap_sram_push(omap1510_cpu_suspend,
679 omap1510_cpu_suspend_sz);
680 } else if (cpu_is_omap16xx()) {
681 omap_sram_suspend = omap_sram_push(omap1610_cpu_suspend,
682 omap1610_cpu_suspend_sz);
683 }
684
685 if (omap_sram_suspend == NULL) {
686 printk(KERN_ERR "PM not initialized: Missing SRAM support\n");
687 return -ENODEV;
688 }
689
690 pm_idle = omap1_pm_idle;
691
692 if (cpu_is_omap7xx())
693 setup_irq(INT_7XX_WAKE_UP_REQ, &omap_wakeup_irq);
694 else if (cpu_is_omap16xx())
695 setup_irq(INT_1610_WAKE_UP_REQ, &omap_wakeup_irq);
696
697 /* Program new power ramp-up time
698 * (0 for most boards since we don't lower voltage when in deep sleep)
699 */
700 omap_writew(ULPD_SETUP_ANALOG_CELL_3_VAL, ULPD_SETUP_ANALOG_CELL_3);
701
702 /* Setup ULPD POWER_CTRL_REG - enter deep sleep whenever possible */
703 omap_writew(ULPD_POWER_CTRL_REG_VAL, ULPD_POWER_CTRL);
704
705 /* Configure IDLECT3 */
706 if (cpu_is_omap7xx())
707 omap_writel(OMAP7XX_IDLECT3_VAL, OMAP7XX_IDLECT3);
708 else if (cpu_is_omap16xx())
709 omap_writel(OMAP1610_IDLECT3_VAL, OMAP1610_IDLECT3);
710
711 suspend_set_ops(&omap_pm_ops);
712
713 #if defined(DEBUG) && defined(CONFIG_PROC_FS)
714 omap_pm_init_proc();
715 #endif
716
717 #ifdef CONFIG_OMAP_32K_TIMER
718 error = sysfs_create_file(power_kobj, &sleep_while_idle_attr.attr);
719 if (error)
720 printk(KERN_ERR "sysfs_create_file failed: %d\n", error);
721 #endif
722
723 if (cpu_is_omap16xx()) {
724 /* configure LOW_PWR pin */
725 omap_cfg_reg(T20_1610_LOW_PWR);
726 }
727
728 return 0;
729 }
730 __initcall(omap_pm_init);