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1/*
2 * OMAP3 Power Management Routines
3 *
4 * Copyright (C) 2006-2008 Nokia Corporation
5 * Tony Lindgren <tony@atomide.com>
6 * Jouni Hogander
7 *
8 * Copyright (C) 2007 Texas Instruments, Inc.
9 * Rajendra Nayak <rnayak@ti.com>
10 *
11 * Copyright (C) 2005 Texas Instruments, Inc.
12 * Richard Woodruff <r-woodruff2@ti.com>
13 *
14 * Based on pm.c for omap1
15 *
16 * This program is free software; you can redistribute it and/or modify
17 * it under the terms of the GNU General Public License version 2 as
18 * published by the Free Software Foundation.
19 */
20
21#include <linux/pm.h>
22#include <linux/suspend.h>
23#include <linux/interrupt.h>
24#include <linux/module.h>
25#include <linux/list.h>
26#include <linux/err.h>
27#include <linux/gpio.h>
28#include <linux/clk.h>
29#include <linux/delay.h>
30#include <linux/slab.h>
31#include <linux/omap-dma.h>
32#include <linux/platform_data/gpio-omap.h>
33
34#include <trace/events/power.h>
35
36#include <asm/fncpy.h>
37#include <asm/suspend.h>
38#include <asm/system_misc.h>
39
40#include "clockdomain.h"
41#include "powerdomain.h"
42#include "soc.h"
43#include "common.h"
44#include "cm3xxx.h"
45#include "cm-regbits-34xx.h"
46#include "gpmc.h"
47#include "prm-regbits-34xx.h"
48#include "prm3xxx.h"
49#include "pm.h"
50#include "sdrc.h"
51#include "sram.h"
52#include "control.h"
53
54/* pm34xx errata defined in pm.h */
55u16 pm34xx_errata;
56
57struct power_state {
58 struct powerdomain *pwrdm;
59 u32 next_state;
60#ifdef CONFIG_SUSPEND
61 u32 saved_state;
62#endif
63 struct list_head node;
64};
65
66static LIST_HEAD(pwrst_list);
67
68static int (*_omap_save_secure_sram)(u32 *addr);
69void (*omap3_do_wfi_sram)(void);
70
71static struct powerdomain *mpu_pwrdm, *neon_pwrdm;
72static struct powerdomain *core_pwrdm, *per_pwrdm;
73
74static void omap3_core_save_context(void)
75{
76 omap3_ctrl_save_padconf();
77
78 /*
79 * Force write last pad into memory, as this can fail in some
80 * cases according to errata 1.157, 1.185
81 */
82 omap_ctrl_writel(omap_ctrl_readl(OMAP343X_PADCONF_ETK_D14),
83 OMAP343X_CONTROL_MEM_WKUP + 0x2a0);
84
85 /* Save the Interrupt controller context */
86 omap_intc_save_context();
87 /* Save the GPMC context */
88 omap3_gpmc_save_context();
89 /* Save the system control module context, padconf already save above*/
90 omap3_control_save_context();
91 omap_dma_global_context_save();
92}
93
94static void omap3_core_restore_context(void)
95{
96 /* Restore the control module context, padconf restored by h/w */
97 omap3_control_restore_context();
98 /* Restore the GPMC context */
99 omap3_gpmc_restore_context();
100 /* Restore the interrupt controller context */
101 omap_intc_restore_context();
102 omap_dma_global_context_restore();
103}
104
105/*
106 * FIXME: This function should be called before entering off-mode after
107 * OMAP3 secure services have been accessed. Currently it is only called
108 * once during boot sequence, but this works as we are not using secure
109 * services.
110 */
111static void omap3_save_secure_ram_context(void)
112{
113 u32 ret;
114 int mpu_next_state = pwrdm_read_next_pwrst(mpu_pwrdm);
115
116 if (omap_type() != OMAP2_DEVICE_TYPE_GP) {
117 /*
118 * MPU next state must be set to POWER_ON temporarily,
119 * otherwise the WFI executed inside the ROM code
120 * will hang the system.
121 */
122 pwrdm_set_next_pwrst(mpu_pwrdm, PWRDM_POWER_ON);
123 ret = _omap_save_secure_sram((u32 *)(unsigned long)
124 __pa(omap3_secure_ram_storage));
125 pwrdm_set_next_pwrst(mpu_pwrdm, mpu_next_state);
126 /* Following is for error tracking, it should not happen */
127 if (ret) {
128 pr_err("save_secure_sram() returns %08x\n", ret);
129 while (1)
130 ;
131 }
132 }
133}
134
135/*
136 * PRCM Interrupt Handler Helper Function
137 *
138 * The purpose of this function is to clear any wake-up events latched
139 * in the PRCM PM_WKST_x registers. It is possible that a wake-up event
140 * may occur whilst attempting to clear a PM_WKST_x register and thus
141 * set another bit in this register. A while loop is used to ensure
142 * that any peripheral wake-up events occurring while attempting to
143 * clear the PM_WKST_x are detected and cleared.
144 */
145static int prcm_clear_mod_irqs(s16 module, u8 regs, u32 ignore_bits)
146{
147 u32 wkst, fclk, iclk, clken;
148 u16 wkst_off = (regs == 3) ? OMAP3430ES2_PM_WKST3 : PM_WKST1;
149 u16 fclk_off = (regs == 3) ? OMAP3430ES2_CM_FCLKEN3 : CM_FCLKEN1;
150 u16 iclk_off = (regs == 3) ? CM_ICLKEN3 : CM_ICLKEN1;
151 u16 grpsel_off = (regs == 3) ?
152 OMAP3430ES2_PM_MPUGRPSEL3 : OMAP3430_PM_MPUGRPSEL;
153 int c = 0;
154
155 wkst = omap2_prm_read_mod_reg(module, wkst_off);
156 wkst &= omap2_prm_read_mod_reg(module, grpsel_off);
157 wkst &= ~ignore_bits;
158 if (wkst) {
159 iclk = omap2_cm_read_mod_reg(module, iclk_off);
160 fclk = omap2_cm_read_mod_reg(module, fclk_off);
161 while (wkst) {
162 clken = wkst;
163 omap2_cm_set_mod_reg_bits(clken, module, iclk_off);
164 /*
165 * For USBHOST, we don't know whether HOST1 or
166 * HOST2 woke us up, so enable both f-clocks
167 */
168 if (module == OMAP3430ES2_USBHOST_MOD)
169 clken |= 1 << OMAP3430ES2_EN_USBHOST2_SHIFT;
170 omap2_cm_set_mod_reg_bits(clken, module, fclk_off);
171 omap2_prm_write_mod_reg(wkst, module, wkst_off);
172 wkst = omap2_prm_read_mod_reg(module, wkst_off);
173 wkst &= ~ignore_bits;
174 c++;
175 }
176 omap2_cm_write_mod_reg(iclk, module, iclk_off);
177 omap2_cm_write_mod_reg(fclk, module, fclk_off);
178 }
179
180 return c;
181}
182
183static irqreturn_t _prcm_int_handle_io(int irq, void *unused)
184{
185 int c;
186
187 c = prcm_clear_mod_irqs(WKUP_MOD, 1,
188 ~(OMAP3430_ST_IO_MASK | OMAP3430_ST_IO_CHAIN_MASK));
189
190 return c ? IRQ_HANDLED : IRQ_NONE;
191}
192
193static irqreturn_t _prcm_int_handle_wakeup(int irq, void *unused)
194{
195 int c;
196
197 /*
198 * Clear all except ST_IO and ST_IO_CHAIN for wkup module,
199 * these are handled in a separate handler to avoid acking
200 * IO events before parsing in mux code
201 */
202 c = prcm_clear_mod_irqs(WKUP_MOD, 1,
203 OMAP3430_ST_IO_MASK | OMAP3430_ST_IO_CHAIN_MASK);
204 c += prcm_clear_mod_irqs(CORE_MOD, 1, 0);
205 c += prcm_clear_mod_irqs(OMAP3430_PER_MOD, 1, 0);
206 if (omap_rev() > OMAP3430_REV_ES1_0) {
207 c += prcm_clear_mod_irqs(CORE_MOD, 3, 0);
208 c += prcm_clear_mod_irqs(OMAP3430ES2_USBHOST_MOD, 1, 0);
209 }
210
211 return c ? IRQ_HANDLED : IRQ_NONE;
212}
213
214static void omap34xx_save_context(u32 *save)
215{
216 u32 val;
217
218 /* Read Auxiliary Control Register */
219 asm("mrc p15, 0, %0, c1, c0, 1" : "=r" (val));
220 *save++ = 1;
221 *save++ = val;
222
223 /* Read L2 AUX ctrl register */
224 asm("mrc p15, 1, %0, c9, c0, 2" : "=r" (val));
225 *save++ = 1;
226 *save++ = val;
227}
228
229static int omap34xx_do_sram_idle(unsigned long save_state)
230{
231 omap34xx_cpu_suspend(save_state);
232 return 0;
233}
234
235void omap_sram_idle(void)
236{
237 /* Variable to tell what needs to be saved and restored
238 * in omap_sram_idle*/
239 /* save_state = 0 => Nothing to save and restored */
240 /* save_state = 1 => Only L1 and logic lost */
241 /* save_state = 2 => Only L2 lost */
242 /* save_state = 3 => L1, L2 and logic lost */
243 int save_state = 0;
244 int mpu_next_state = PWRDM_POWER_ON;
245 int per_next_state = PWRDM_POWER_ON;
246 int core_next_state = PWRDM_POWER_ON;
247 int per_going_off;
248 int core_prev_state;
249 u32 sdrc_pwr = 0;
250
251 mpu_next_state = pwrdm_read_next_pwrst(mpu_pwrdm);
252 switch (mpu_next_state) {
253 case PWRDM_POWER_ON:
254 case PWRDM_POWER_RET:
255 /* No need to save context */
256 save_state = 0;
257 break;
258 case PWRDM_POWER_OFF:
259 save_state = 3;
260 break;
261 default:
262 /* Invalid state */
263 pr_err("Invalid mpu state in sram_idle\n");
264 return;
265 }
266
267 /* NEON control */
268 if (pwrdm_read_pwrst(neon_pwrdm) == PWRDM_POWER_ON)
269 pwrdm_set_next_pwrst(neon_pwrdm, mpu_next_state);
270
271 /* Enable IO-PAD and IO-CHAIN wakeups */
272 per_next_state = pwrdm_read_next_pwrst(per_pwrdm);
273 core_next_state = pwrdm_read_next_pwrst(core_pwrdm);
274
275 pwrdm_pre_transition(NULL);
276
277 /* PER */
278 if (per_next_state < PWRDM_POWER_ON) {
279 per_going_off = (per_next_state == PWRDM_POWER_OFF) ? 1 : 0;
280 omap2_gpio_prepare_for_idle(per_going_off);
281 }
282
283 /* CORE */
284 if (core_next_state < PWRDM_POWER_ON) {
285 if (core_next_state == PWRDM_POWER_OFF) {
286 omap3_core_save_context();
287 omap3_cm_save_context();
288 }
289 }
290
291 omap3_intc_prepare_idle();
292
293 /*
294 * On EMU/HS devices ROM code restores a SRDC value
295 * from scratchpad which has automatic self refresh on timeout
296 * of AUTO_CNT = 1 enabled. This takes care of erratum ID i443.
297 * Hence store/restore the SDRC_POWER register here.
298 */
299 if (cpu_is_omap3430() && omap_rev() >= OMAP3430_REV_ES3_0 &&
300 (omap_type() == OMAP2_DEVICE_TYPE_EMU ||
301 omap_type() == OMAP2_DEVICE_TYPE_SEC) &&
302 core_next_state == PWRDM_POWER_OFF)
303 sdrc_pwr = sdrc_read_reg(SDRC_POWER);
304
305 /*
306 * omap3_arm_context is the location where some ARM context
307 * get saved. The rest is placed on the stack, and restored
308 * from there before resuming.
309 */
310 if (save_state)
311 omap34xx_save_context(omap3_arm_context);
312 if (save_state == 1 || save_state == 3)
313 cpu_suspend(save_state, omap34xx_do_sram_idle);
314 else
315 omap34xx_do_sram_idle(save_state);
316
317 /* Restore normal SDRC POWER settings */
318 if (cpu_is_omap3430() && omap_rev() >= OMAP3430_REV_ES3_0 &&
319 (omap_type() == OMAP2_DEVICE_TYPE_EMU ||
320 omap_type() == OMAP2_DEVICE_TYPE_SEC) &&
321 core_next_state == PWRDM_POWER_OFF)
322 sdrc_write_reg(sdrc_pwr, SDRC_POWER);
323
324 /* CORE */
325 if (core_next_state < PWRDM_POWER_ON) {
326 core_prev_state = pwrdm_read_prev_pwrst(core_pwrdm);
327 if (core_prev_state == PWRDM_POWER_OFF) {
328 omap3_core_restore_context();
329 omap3_cm_restore_context();
330 omap3_sram_restore_context();
331 omap2_sms_restore_context();
332 }
333 }
334 omap3_intc_resume_idle();
335
336 pwrdm_post_transition(NULL);
337
338 /* PER */
339 if (per_next_state < PWRDM_POWER_ON)
340 omap2_gpio_resume_after_idle();
341}
342
343static void omap3_pm_idle(void)
344{
345 if (omap_irq_pending())
346 return;
347
348 trace_cpu_idle(1, smp_processor_id());
349
350 omap_sram_idle();
351
352 trace_cpu_idle(PWR_EVENT_EXIT, smp_processor_id());
353}
354
355#ifdef CONFIG_SUSPEND
356static int omap3_pm_suspend(void)
357{
358 struct power_state *pwrst;
359 int state, ret = 0;
360
361 /* Read current next_pwrsts */
362 list_for_each_entry(pwrst, &pwrst_list, node)
363 pwrst->saved_state = pwrdm_read_next_pwrst(pwrst->pwrdm);
364 /* Set ones wanted by suspend */
365 list_for_each_entry(pwrst, &pwrst_list, node) {
366 if (omap_set_pwrdm_state(pwrst->pwrdm, pwrst->next_state))
367 goto restore;
368 if (pwrdm_clear_all_prev_pwrst(pwrst->pwrdm))
369 goto restore;
370 }
371
372 omap3_intc_suspend();
373
374 omap_sram_idle();
375
376restore:
377 /* Restore next_pwrsts */
378 list_for_each_entry(pwrst, &pwrst_list, node) {
379 state = pwrdm_read_prev_pwrst(pwrst->pwrdm);
380 if (state > pwrst->next_state) {
381 pr_info("Powerdomain (%s) didn't enter target state %d\n",
382 pwrst->pwrdm->name, pwrst->next_state);
383 ret = -1;
384 }
385 omap_set_pwrdm_state(pwrst->pwrdm, pwrst->saved_state);
386 }
387 if (ret)
388 pr_err("Could not enter target state in pm_suspend\n");
389 else
390 pr_info("Successfully put all powerdomains to target state\n");
391
392 return ret;
393}
394
395#endif /* CONFIG_SUSPEND */
396
397
398/**
399 * omap3_iva_idle(): ensure IVA is in idle so it can be put into
400 * retention
401 *
402 * In cases where IVA2 is activated by bootcode, it may prevent
403 * full-chip retention or off-mode because it is not idle. This
404 * function forces the IVA2 into idle state so it can go
405 * into retention/off and thus allow full-chip retention/off.
406 *
407 **/
408static void __init omap3_iva_idle(void)
409{
410 /* ensure IVA2 clock is disabled */
411 omap2_cm_write_mod_reg(0, OMAP3430_IVA2_MOD, CM_FCLKEN);
412
413 /* if no clock activity, nothing else to do */
414 if (!(omap2_cm_read_mod_reg(OMAP3430_IVA2_MOD, OMAP3430_CM_CLKSTST) &
415 OMAP3430_CLKACTIVITY_IVA2_MASK))
416 return;
417
418 /* Reset IVA2 */
419 omap2_prm_write_mod_reg(OMAP3430_RST1_IVA2_MASK |
420 OMAP3430_RST2_IVA2_MASK |
421 OMAP3430_RST3_IVA2_MASK,
422 OMAP3430_IVA2_MOD, OMAP2_RM_RSTCTRL);
423
424 /* Enable IVA2 clock */
425 omap2_cm_write_mod_reg(OMAP3430_CM_FCLKEN_IVA2_EN_IVA2_MASK,
426 OMAP3430_IVA2_MOD, CM_FCLKEN);
427
428 /* Set IVA2 boot mode to 'idle' */
429 omap3_ctrl_set_iva_bootmode_idle();
430
431 /* Un-reset IVA2 */
432 omap2_prm_write_mod_reg(0, OMAP3430_IVA2_MOD, OMAP2_RM_RSTCTRL);
433
434 /* Disable IVA2 clock */
435 omap2_cm_write_mod_reg(0, OMAP3430_IVA2_MOD, CM_FCLKEN);
436
437 /* Reset IVA2 */
438 omap2_prm_write_mod_reg(OMAP3430_RST1_IVA2_MASK |
439 OMAP3430_RST2_IVA2_MASK |
440 OMAP3430_RST3_IVA2_MASK,
441 OMAP3430_IVA2_MOD, OMAP2_RM_RSTCTRL);
442}
443
444static void __init omap3_d2d_idle(void)
445{
446 u16 mask, padconf;
447
448 /* In a stand alone OMAP3430 where there is not a stacked
449 * modem for the D2D Idle Ack and D2D MStandby must be pulled
450 * high. S CONTROL_PADCONF_SAD2D_IDLEACK and
451 * CONTROL_PADCONF_SAD2D_MSTDBY to have a pull up. */
452 mask = (1 << 4) | (1 << 3); /* pull-up, enabled */
453 padconf = omap_ctrl_readw(OMAP3_PADCONF_SAD2D_MSTANDBY);
454 padconf |= mask;
455 omap_ctrl_writew(padconf, OMAP3_PADCONF_SAD2D_MSTANDBY);
456
457 padconf = omap_ctrl_readw(OMAP3_PADCONF_SAD2D_IDLEACK);
458 padconf |= mask;
459 omap_ctrl_writew(padconf, OMAP3_PADCONF_SAD2D_IDLEACK);
460
461 /* reset modem */
462 omap2_prm_write_mod_reg(OMAP3430_RM_RSTCTRL_CORE_MODEM_SW_RSTPWRON_MASK |
463 OMAP3430_RM_RSTCTRL_CORE_MODEM_SW_RST_MASK,
464 CORE_MOD, OMAP2_RM_RSTCTRL);
465 omap2_prm_write_mod_reg(0, CORE_MOD, OMAP2_RM_RSTCTRL);
466}
467
468static void __init prcm_setup_regs(void)
469{
470 u32 omap3630_en_uart4_mask = cpu_is_omap3630() ?
471 OMAP3630_EN_UART4_MASK : 0;
472 u32 omap3630_grpsel_uart4_mask = cpu_is_omap3630() ?
473 OMAP3630_GRPSEL_UART4_MASK : 0;
474
475 /* XXX This should be handled by hwmod code or SCM init code */
476 omap_ctrl_writel(OMAP3430_AUTOIDLE_MASK, OMAP2_CONTROL_SYSCONFIG);
477
478 /*
479 * Enable control of expternal oscillator through
480 * sys_clkreq. In the long run clock framework should
481 * take care of this.
482 */
483 omap2_prm_rmw_mod_reg_bits(OMAP_AUTOEXTCLKMODE_MASK,
484 1 << OMAP_AUTOEXTCLKMODE_SHIFT,
485 OMAP3430_GR_MOD,
486 OMAP3_PRM_CLKSRC_CTRL_OFFSET);
487
488 /* setup wakup source */
489 omap2_prm_write_mod_reg(OMAP3430_EN_IO_MASK | OMAP3430_EN_GPIO1_MASK |
490 OMAP3430_EN_GPT1_MASK | OMAP3430_EN_GPT12_MASK,
491 WKUP_MOD, PM_WKEN);
492 /* No need to write EN_IO, that is always enabled */
493 omap2_prm_write_mod_reg(OMAP3430_GRPSEL_GPIO1_MASK |
494 OMAP3430_GRPSEL_GPT1_MASK |
495 OMAP3430_GRPSEL_GPT12_MASK,
496 WKUP_MOD, OMAP3430_PM_MPUGRPSEL);
497
498 /* Enable PM_WKEN to support DSS LPR */
499 omap2_prm_write_mod_reg(OMAP3430_PM_WKEN_DSS_EN_DSS_MASK,
500 OMAP3430_DSS_MOD, PM_WKEN);
501
502 /* Enable wakeups in PER */
503 omap2_prm_write_mod_reg(omap3630_en_uart4_mask |
504 OMAP3430_EN_GPIO2_MASK | OMAP3430_EN_GPIO3_MASK |
505 OMAP3430_EN_GPIO4_MASK | OMAP3430_EN_GPIO5_MASK |
506 OMAP3430_EN_GPIO6_MASK | OMAP3430_EN_UART3_MASK |
507 OMAP3430_EN_MCBSP2_MASK | OMAP3430_EN_MCBSP3_MASK |
508 OMAP3430_EN_MCBSP4_MASK,
509 OMAP3430_PER_MOD, PM_WKEN);
510 /* and allow them to wake up MPU */
511 omap2_prm_write_mod_reg(omap3630_grpsel_uart4_mask |
512 OMAP3430_GRPSEL_GPIO2_MASK |
513 OMAP3430_GRPSEL_GPIO3_MASK |
514 OMAP3430_GRPSEL_GPIO4_MASK |
515 OMAP3430_GRPSEL_GPIO5_MASK |
516 OMAP3430_GRPSEL_GPIO6_MASK |
517 OMAP3430_GRPSEL_UART3_MASK |
518 OMAP3430_GRPSEL_MCBSP2_MASK |
519 OMAP3430_GRPSEL_MCBSP3_MASK |
520 OMAP3430_GRPSEL_MCBSP4_MASK,
521 OMAP3430_PER_MOD, OMAP3430_PM_MPUGRPSEL);
522
523 /* Don't attach IVA interrupts */
524 if (omap3_has_iva()) {
525 omap2_prm_write_mod_reg(0, WKUP_MOD, OMAP3430_PM_IVAGRPSEL);
526 omap2_prm_write_mod_reg(0, CORE_MOD, OMAP3430_PM_IVAGRPSEL1);
527 omap2_prm_write_mod_reg(0, CORE_MOD, OMAP3430ES2_PM_IVAGRPSEL3);
528 omap2_prm_write_mod_reg(0, OMAP3430_PER_MOD,
529 OMAP3430_PM_IVAGRPSEL);
530 }
531
532 /* Clear any pending 'reset' flags */
533 omap2_prm_write_mod_reg(0xffffffff, MPU_MOD, OMAP2_RM_RSTST);
534 omap2_prm_write_mod_reg(0xffffffff, CORE_MOD, OMAP2_RM_RSTST);
535 omap2_prm_write_mod_reg(0xffffffff, OMAP3430_PER_MOD, OMAP2_RM_RSTST);
536 omap2_prm_write_mod_reg(0xffffffff, OMAP3430_EMU_MOD, OMAP2_RM_RSTST);
537 omap2_prm_write_mod_reg(0xffffffff, OMAP3430_NEON_MOD, OMAP2_RM_RSTST);
538 omap2_prm_write_mod_reg(0xffffffff, OMAP3430_DSS_MOD, OMAP2_RM_RSTST);
539 omap2_prm_write_mod_reg(0xffffffff, OMAP3430ES2_USBHOST_MOD, OMAP2_RM_RSTST);
540
541 /* Clear any pending PRCM interrupts */
542 omap2_prm_write_mod_reg(0, OCP_MOD, OMAP3_PRM_IRQSTATUS_MPU_OFFSET);
543
544 /*
545 * We need to idle iva2_pwrdm even on am3703 with no iva2.
546 */
547 omap3_iva_idle();
548
549 omap3_d2d_idle();
550}
551
552void omap3_pm_off_mode_enable(int enable)
553{
554 struct power_state *pwrst;
555 u32 state;
556
557 if (enable)
558 state = PWRDM_POWER_OFF;
559 else
560 state = PWRDM_POWER_RET;
561
562 list_for_each_entry(pwrst, &pwrst_list, node) {
563 if (IS_PM34XX_ERRATUM(PM_SDRC_WAKEUP_ERRATUM_i583) &&
564 pwrst->pwrdm == core_pwrdm &&
565 state == PWRDM_POWER_OFF) {
566 pwrst->next_state = PWRDM_POWER_RET;
567 pr_warn("%s: Core OFF disabled due to errata i583\n",
568 __func__);
569 } else {
570 pwrst->next_state = state;
571 }
572 omap_set_pwrdm_state(pwrst->pwrdm, pwrst->next_state);
573 }
574}
575
576int omap3_pm_get_suspend_state(struct powerdomain *pwrdm)
577{
578 struct power_state *pwrst;
579
580 list_for_each_entry(pwrst, &pwrst_list, node) {
581 if (pwrst->pwrdm == pwrdm)
582 return pwrst->next_state;
583 }
584 return -EINVAL;
585}
586
587int omap3_pm_set_suspend_state(struct powerdomain *pwrdm, int state)
588{
589 struct power_state *pwrst;
590
591 list_for_each_entry(pwrst, &pwrst_list, node) {
592 if (pwrst->pwrdm == pwrdm) {
593 pwrst->next_state = state;
594 return 0;
595 }
596 }
597 return -EINVAL;
598}
599
600static int __init pwrdms_setup(struct powerdomain *pwrdm, void *unused)
601{
602 struct power_state *pwrst;
603
604 if (!pwrdm->pwrsts)
605 return 0;
606
607 pwrst = kmalloc(sizeof(struct power_state), GFP_ATOMIC);
608 if (!pwrst)
609 return -ENOMEM;
610 pwrst->pwrdm = pwrdm;
611 pwrst->next_state = PWRDM_POWER_RET;
612 list_add(&pwrst->node, &pwrst_list);
613
614 if (pwrdm_has_hdwr_sar(pwrdm))
615 pwrdm_enable_hdwr_sar(pwrdm);
616
617 return omap_set_pwrdm_state(pwrst->pwrdm, pwrst->next_state);
618}
619
620/*
621 * Push functions to SRAM
622 *
623 * The minimum set of functions is pushed to SRAM for execution:
624 * - omap3_do_wfi for erratum i581 WA,
625 * - save_secure_ram_context for security extensions.
626 */
627void omap_push_sram_idle(void)
628{
629 omap3_do_wfi_sram = omap_sram_push(omap3_do_wfi, omap3_do_wfi_sz);
630
631 if (omap_type() != OMAP2_DEVICE_TYPE_GP)
632 _omap_save_secure_sram = omap_sram_push(save_secure_ram_context,
633 save_secure_ram_context_sz);
634}
635
636static void __init pm_errata_configure(void)
637{
638 if (cpu_is_omap3630()) {
639 pm34xx_errata |= PM_RTA_ERRATUM_i608;
640 /* Enable the l2 cache toggling in sleep logic */
641 enable_omap3630_toggle_l2_on_restore();
642 if (omap_rev() < OMAP3630_REV_ES1_2)
643 pm34xx_errata |= (PM_SDRC_WAKEUP_ERRATUM_i583 |
644 PM_PER_MEMORIES_ERRATUM_i582);
645 } else if (cpu_is_omap34xx()) {
646 pm34xx_errata |= PM_PER_MEMORIES_ERRATUM_i582;
647 }
648}
649
650int __init omap3_pm_init(void)
651{
652 struct power_state *pwrst, *tmp;
653 struct clockdomain *neon_clkdm, *mpu_clkdm, *per_clkdm, *wkup_clkdm;
654 int ret;
655
656 if (!omap3_has_io_chain_ctrl())
657 pr_warning("PM: no software I/O chain control; some wakeups may be lost\n");
658
659 pm_errata_configure();
660
661 /* XXX prcm_setup_regs needs to be before enabling hw
662 * supervised mode for powerdomains */
663 prcm_setup_regs();
664
665 ret = request_irq(omap_prcm_event_to_irq("wkup"),
666 _prcm_int_handle_wakeup, IRQF_NO_SUSPEND, "pm_wkup", NULL);
667
668 if (ret) {
669 pr_err("pm: Failed to request pm_wkup irq\n");
670 goto err1;
671 }
672
673 /* IO interrupt is shared with mux code */
674 ret = request_irq(omap_prcm_event_to_irq("io"),
675 _prcm_int_handle_io, IRQF_SHARED | IRQF_NO_SUSPEND, "pm_io",
676 omap3_pm_init);
677 enable_irq(omap_prcm_event_to_irq("io"));
678
679 if (ret) {
680 pr_err("pm: Failed to request pm_io irq\n");
681 goto err2;
682 }
683
684 ret = pwrdm_for_each(pwrdms_setup, NULL);
685 if (ret) {
686 pr_err("Failed to setup powerdomains\n");
687 goto err3;
688 }
689
690 (void) clkdm_for_each(omap_pm_clkdms_setup, NULL);
691
692 mpu_pwrdm = pwrdm_lookup("mpu_pwrdm");
693 if (mpu_pwrdm == NULL) {
694 pr_err("Failed to get mpu_pwrdm\n");
695 ret = -EINVAL;
696 goto err3;
697 }
698
699 neon_pwrdm = pwrdm_lookup("neon_pwrdm");
700 per_pwrdm = pwrdm_lookup("per_pwrdm");
701 core_pwrdm = pwrdm_lookup("core_pwrdm");
702
703 neon_clkdm = clkdm_lookup("neon_clkdm");
704 mpu_clkdm = clkdm_lookup("mpu_clkdm");
705 per_clkdm = clkdm_lookup("per_clkdm");
706 wkup_clkdm = clkdm_lookup("wkup_clkdm");
707
708#ifdef CONFIG_SUSPEND
709 omap_pm_suspend = omap3_pm_suspend;
710#endif
711
712 arm_pm_idle = omap3_pm_idle;
713 omap3_idle_init();
714
715 /*
716 * RTA is disabled during initialization as per erratum i608
717 * it is safer to disable RTA by the bootloader, but we would like
718 * to be doubly sure here and prevent any mishaps.
719 */
720 if (IS_PM34XX_ERRATUM(PM_RTA_ERRATUM_i608))
721 omap3630_ctrl_disable_rta();
722
723 /*
724 * The UART3/4 FIFO and the sidetone memory in McBSP2/3 are
725 * not correctly reset when the PER powerdomain comes back
726 * from OFF or OSWR when the CORE powerdomain is kept active.
727 * See OMAP36xx Erratum i582 "PER Domain reset issue after
728 * Domain-OFF/OSWR Wakeup". This wakeup dependency is not a
729 * complete workaround. The kernel must also prevent the PER
730 * powerdomain from going to OSWR/OFF while the CORE
731 * powerdomain is not going to OSWR/OFF. And if PER last
732 * power state was off while CORE last power state was ON, the
733 * UART3/4 and McBSP2/3 SIDETONE devices need to run a
734 * self-test using their loopback tests; if that fails, those
735 * devices are unusable until the PER/CORE can complete a transition
736 * from ON to OSWR/OFF and then back to ON.
737 *
738 * XXX Technically this workaround is only needed if off-mode
739 * or OSWR is enabled.
740 */
741 if (IS_PM34XX_ERRATUM(PM_PER_MEMORIES_ERRATUM_i582))
742 clkdm_add_wkdep(per_clkdm, wkup_clkdm);
743
744 clkdm_add_wkdep(neon_clkdm, mpu_clkdm);
745 if (omap_type() != OMAP2_DEVICE_TYPE_GP) {
746 omap3_secure_ram_storage =
747 kmalloc(0x803F, GFP_KERNEL);
748 if (!omap3_secure_ram_storage)
749 pr_err("Memory allocation failed when allocating for secure sram context\n");
750
751 local_irq_disable();
752
753 omap_dma_global_context_save();
754 omap3_save_secure_ram_context();
755 omap_dma_global_context_restore();
756
757 local_irq_enable();
758 }
759
760 omap3_save_scratchpad_contents();
761 return ret;
762
763err3:
764 list_for_each_entry_safe(pwrst, tmp, &pwrst_list, node) {
765 list_del(&pwrst->node);
766 kfree(pwrst);
767 }
768 free_irq(omap_prcm_event_to_irq("io"), omap3_pm_init);
769err2:
770 free_irq(omap_prcm_event_to_irq("wkup"), NULL);
771err1:
772 return ret;
773}
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * OMAP3 Power Management Routines
4 *
5 * Copyright (C) 2006-2008 Nokia Corporation
6 * Tony Lindgren <tony@atomide.com>
7 * Jouni Hogander
8 *
9 * Copyright (C) 2007 Texas Instruments, Inc.
10 * Rajendra Nayak <rnayak@ti.com>
11 *
12 * Copyright (C) 2005 Texas Instruments, Inc.
13 * Richard Woodruff <r-woodruff2@ti.com>
14 *
15 * Based on pm.c for omap1
16 */
17
18#include <linux/cpu_pm.h>
19#include <linux/pm.h>
20#include <linux/suspend.h>
21#include <linux/interrupt.h>
22#include <linux/module.h>
23#include <linux/list.h>
24#include <linux/err.h>
25#include <linux/clk.h>
26#include <linux/delay.h>
27#include <linux/slab.h>
28#include <linux/of.h>
29
30#include <trace/events/power.h>
31
32#include <asm/fncpy.h>
33#include <asm/suspend.h>
34#include <asm/system_misc.h>
35
36#include "clockdomain.h"
37#include "powerdomain.h"
38#include "soc.h"
39#include "common.h"
40#include "cm3xxx.h"
41#include "cm-regbits-34xx.h"
42#include "prm-regbits-34xx.h"
43#include "prm3xxx.h"
44#include "pm.h"
45#include "sdrc.h"
46#include "omap-secure.h"
47#include "sram.h"
48#include "control.h"
49#include "vc.h"
50
51/* pm34xx errata defined in pm.h */
52u16 pm34xx_errata;
53
54struct power_state {
55 struct powerdomain *pwrdm;
56 u32 next_state;
57#ifdef CONFIG_SUSPEND
58 u32 saved_state;
59#endif
60 struct list_head node;
61};
62
63static LIST_HEAD(pwrst_list);
64
65void (*omap3_do_wfi_sram)(void);
66
67static struct powerdomain *mpu_pwrdm, *neon_pwrdm;
68static struct powerdomain *core_pwrdm, *per_pwrdm;
69
70static void omap3_core_save_context(void)
71{
72 omap3_ctrl_save_padconf();
73
74 /*
75 * Force write last pad into memory, as this can fail in some
76 * cases according to errata 1.157, 1.185
77 */
78 omap_ctrl_writel(omap_ctrl_readl(OMAP343X_PADCONF_ETK_D14),
79 OMAP343X_CONTROL_MEM_WKUP + 0x2a0);
80
81 /* Save the Interrupt controller context */
82 omap_intc_save_context();
83 /* Save the system control module context, padconf already save above*/
84 omap3_control_save_context();
85}
86
87static void omap3_core_restore_context(void)
88{
89 /* Restore the control module context, padconf restored by h/w */
90 omap3_control_restore_context();
91 /* Restore the interrupt controller context */
92 omap_intc_restore_context();
93}
94
95/*
96 * FIXME: This function should be called before entering off-mode after
97 * OMAP3 secure services have been accessed. Currently it is only called
98 * once during boot sequence, but this works as we are not using secure
99 * services.
100 */
101static void omap3_save_secure_ram_context(void)
102{
103 u32 ret;
104 int mpu_next_state = pwrdm_read_next_pwrst(mpu_pwrdm);
105
106 if (omap_type() != OMAP2_DEVICE_TYPE_GP) {
107 /*
108 * MPU next state must be set to POWER_ON temporarily,
109 * otherwise the WFI executed inside the ROM code
110 * will hang the system.
111 */
112 pwrdm_set_next_pwrst(mpu_pwrdm, PWRDM_POWER_ON);
113 ret = omap3_save_secure_ram(omap3_secure_ram_storage,
114 OMAP3_SAVE_SECURE_RAM_SZ);
115 pwrdm_set_next_pwrst(mpu_pwrdm, mpu_next_state);
116 /* Following is for error tracking, it should not happen */
117 if (ret) {
118 pr_err("save_secure_sram() returns %08x\n", ret);
119 while (1)
120 ;
121 }
122 }
123}
124
125static irqreturn_t _prcm_int_handle_io(int irq, void *unused)
126{
127 int c;
128
129 c = omap_prm_clear_mod_irqs(WKUP_MOD, 1, OMAP3430_ST_IO_MASK |
130 OMAP3430_ST_IO_CHAIN_MASK);
131
132 return c ? IRQ_HANDLED : IRQ_NONE;
133}
134
135static irqreturn_t _prcm_int_handle_wakeup(int irq, void *unused)
136{
137 int c;
138
139 /*
140 * Clear all except ST_IO and ST_IO_CHAIN for wkup module,
141 * these are handled in a separate handler to avoid acking
142 * IO events before parsing in mux code
143 */
144 c = omap_prm_clear_mod_irqs(WKUP_MOD, 1, ~(OMAP3430_ST_IO_MASK |
145 OMAP3430_ST_IO_CHAIN_MASK));
146 c += omap_prm_clear_mod_irqs(CORE_MOD, 1, ~0);
147 c += omap_prm_clear_mod_irqs(OMAP3430_PER_MOD, 1, ~0);
148 if (omap_rev() > OMAP3430_REV_ES1_0) {
149 c += omap_prm_clear_mod_irqs(CORE_MOD, 3, ~0);
150 c += omap_prm_clear_mod_irqs(OMAP3430ES2_USBHOST_MOD, 1, ~0);
151 }
152
153 return c ? IRQ_HANDLED : IRQ_NONE;
154}
155
156static void omap34xx_save_context(u32 *save)
157{
158 u32 val;
159
160 /* Read Auxiliary Control Register */
161 asm("mrc p15, 0, %0, c1, c0, 1" : "=r" (val));
162 *save++ = 1;
163 *save++ = val;
164
165 /* Read L2 AUX ctrl register */
166 asm("mrc p15, 1, %0, c9, c0, 2" : "=r" (val));
167 *save++ = 1;
168 *save++ = val;
169}
170
171static int omap34xx_do_sram_idle(unsigned long save_state)
172{
173 omap34xx_cpu_suspend(save_state);
174 return 0;
175}
176
177void omap_sram_idle(void)
178{
179 /* Variable to tell what needs to be saved and restored
180 * in omap_sram_idle*/
181 /* save_state = 0 => Nothing to save and restored */
182 /* save_state = 1 => Only L1 and logic lost */
183 /* save_state = 2 => Only L2 lost */
184 /* save_state = 3 => L1, L2 and logic lost */
185 int save_state = 0;
186 int mpu_next_state = PWRDM_POWER_ON;
187 int per_next_state = PWRDM_POWER_ON;
188 int core_next_state = PWRDM_POWER_ON;
189 u32 sdrc_pwr = 0;
190 int error;
191
192 mpu_next_state = pwrdm_read_next_pwrst(mpu_pwrdm);
193 switch (mpu_next_state) {
194 case PWRDM_POWER_ON:
195 case PWRDM_POWER_RET:
196 /* No need to save context */
197 save_state = 0;
198 break;
199 case PWRDM_POWER_OFF:
200 save_state = 3;
201 break;
202 default:
203 /* Invalid state */
204 pr_err("Invalid mpu state in sram_idle\n");
205 return;
206 }
207
208 /* NEON control */
209 if (pwrdm_read_pwrst(neon_pwrdm) == PWRDM_POWER_ON)
210 pwrdm_set_next_pwrst(neon_pwrdm, mpu_next_state);
211
212 /* Enable IO-PAD and IO-CHAIN wakeups */
213 per_next_state = pwrdm_read_next_pwrst(per_pwrdm);
214 core_next_state = pwrdm_read_next_pwrst(core_pwrdm);
215
216 pwrdm_pre_transition(NULL);
217
218 /* PER */
219 if (per_next_state == PWRDM_POWER_OFF) {
220 error = cpu_cluster_pm_enter();
221 if (error)
222 return;
223 }
224
225 /* CORE */
226 if (core_next_state < PWRDM_POWER_ON) {
227 if (core_next_state == PWRDM_POWER_OFF) {
228 omap3_core_save_context();
229 omap3_cm_save_context();
230 }
231 }
232
233 /* Configure PMIC signaling for I2C4 or sys_off_mode */
234 omap3_vc_set_pmic_signaling(core_next_state);
235
236 omap3_intc_prepare_idle();
237
238 /*
239 * On EMU/HS devices ROM code restores a SRDC value
240 * from scratchpad which has automatic self refresh on timeout
241 * of AUTO_CNT = 1 enabled. This takes care of erratum ID i443.
242 * Hence store/restore the SDRC_POWER register here.
243 */
244 if (cpu_is_omap3430() && omap_rev() >= OMAP3430_REV_ES3_0 &&
245 (omap_type() == OMAP2_DEVICE_TYPE_EMU ||
246 omap_type() == OMAP2_DEVICE_TYPE_SEC) &&
247 core_next_state == PWRDM_POWER_OFF)
248 sdrc_pwr = sdrc_read_reg(SDRC_POWER);
249
250 /*
251 * omap3_arm_context is the location where some ARM context
252 * get saved. The rest is placed on the stack, and restored
253 * from there before resuming.
254 */
255 if (save_state)
256 omap34xx_save_context(omap3_arm_context);
257 if (save_state == 1 || save_state == 3)
258 cpu_suspend(save_state, omap34xx_do_sram_idle);
259 else
260 omap34xx_do_sram_idle(save_state);
261
262 /* Restore normal SDRC POWER settings */
263 if (cpu_is_omap3430() && omap_rev() >= OMAP3430_REV_ES3_0 &&
264 (omap_type() == OMAP2_DEVICE_TYPE_EMU ||
265 omap_type() == OMAP2_DEVICE_TYPE_SEC) &&
266 core_next_state == PWRDM_POWER_OFF)
267 sdrc_write_reg(sdrc_pwr, SDRC_POWER);
268
269 /* CORE */
270 if (core_next_state < PWRDM_POWER_ON &&
271 pwrdm_read_prev_pwrst(core_pwrdm) == PWRDM_POWER_OFF) {
272 omap3_core_restore_context();
273 omap3_cm_restore_context();
274 omap3_sram_restore_context();
275 omap2_sms_restore_context();
276 } else {
277 /*
278 * In off-mode resume path above, omap3_core_restore_context
279 * also handles the INTC autoidle restore done here so limit
280 * this to non-off mode resume paths so we don't do it twice.
281 */
282 omap3_intc_resume_idle();
283 }
284
285 pwrdm_post_transition(NULL);
286
287 /* PER */
288 if (per_next_state == PWRDM_POWER_OFF)
289 cpu_cluster_pm_exit();
290}
291
292static void omap3_pm_idle(void)
293{
294 if (omap_irq_pending())
295 return;
296
297 omap_sram_idle();
298}
299
300#ifdef CONFIG_SUSPEND
301static int omap3_pm_suspend(void)
302{
303 struct power_state *pwrst;
304 int state, ret = 0;
305
306 /* Read current next_pwrsts */
307 list_for_each_entry(pwrst, &pwrst_list, node)
308 pwrst->saved_state = pwrdm_read_next_pwrst(pwrst->pwrdm);
309 /* Set ones wanted by suspend */
310 list_for_each_entry(pwrst, &pwrst_list, node) {
311 if (omap_set_pwrdm_state(pwrst->pwrdm, pwrst->next_state))
312 goto restore;
313 if (pwrdm_clear_all_prev_pwrst(pwrst->pwrdm))
314 goto restore;
315 }
316
317 omap3_intc_suspend();
318
319 omap_sram_idle();
320
321restore:
322 /* Restore next_pwrsts */
323 list_for_each_entry(pwrst, &pwrst_list, node) {
324 state = pwrdm_read_prev_pwrst(pwrst->pwrdm);
325 if (state > pwrst->next_state) {
326 pr_info("Powerdomain (%s) didn't enter target state %d\n",
327 pwrst->pwrdm->name, pwrst->next_state);
328 ret = -1;
329 }
330 omap_set_pwrdm_state(pwrst->pwrdm, pwrst->saved_state);
331 }
332 if (ret)
333 pr_err("Could not enter target state in pm_suspend\n");
334 else
335 pr_info("Successfully put all powerdomains to target state\n");
336
337 return ret;
338}
339#else
340#define omap3_pm_suspend NULL
341#endif /* CONFIG_SUSPEND */
342
343static void __init prcm_setup_regs(void)
344{
345 omap3_ctrl_init();
346
347 omap3_prm_init_pm(cpu_is_omap3630(), omap3_has_iva());
348}
349
350void omap3_pm_off_mode_enable(int enable)
351{
352 struct power_state *pwrst;
353 u32 state;
354
355 if (enable)
356 state = PWRDM_POWER_OFF;
357 else
358 state = PWRDM_POWER_RET;
359
360 list_for_each_entry(pwrst, &pwrst_list, node) {
361 if (IS_PM34XX_ERRATUM(PM_SDRC_WAKEUP_ERRATUM_i583) &&
362 pwrst->pwrdm == core_pwrdm &&
363 state == PWRDM_POWER_OFF) {
364 pwrst->next_state = PWRDM_POWER_RET;
365 pr_warn("%s: Core OFF disabled due to errata i583\n",
366 __func__);
367 } else {
368 pwrst->next_state = state;
369 }
370 omap_set_pwrdm_state(pwrst->pwrdm, pwrst->next_state);
371 }
372}
373
374int omap3_pm_get_suspend_state(struct powerdomain *pwrdm)
375{
376 struct power_state *pwrst;
377
378 list_for_each_entry(pwrst, &pwrst_list, node) {
379 if (pwrst->pwrdm == pwrdm)
380 return pwrst->next_state;
381 }
382 return -EINVAL;
383}
384
385int omap3_pm_set_suspend_state(struct powerdomain *pwrdm, int state)
386{
387 struct power_state *pwrst;
388
389 list_for_each_entry(pwrst, &pwrst_list, node) {
390 if (pwrst->pwrdm == pwrdm) {
391 pwrst->next_state = state;
392 return 0;
393 }
394 }
395 return -EINVAL;
396}
397
398static int __init pwrdms_setup(struct powerdomain *pwrdm, void *unused)
399{
400 struct power_state *pwrst;
401
402 if (!pwrdm->pwrsts)
403 return 0;
404
405 pwrst = kmalloc(sizeof(struct power_state), GFP_ATOMIC);
406 if (!pwrst)
407 return -ENOMEM;
408 pwrst->pwrdm = pwrdm;
409
410 if (enable_off_mode)
411 pwrst->next_state = PWRDM_POWER_OFF;
412 else
413 pwrst->next_state = PWRDM_POWER_RET;
414
415 list_add(&pwrst->node, &pwrst_list);
416
417 if (pwrdm_has_hdwr_sar(pwrdm))
418 pwrdm_enable_hdwr_sar(pwrdm);
419
420 return omap_set_pwrdm_state(pwrst->pwrdm, pwrst->next_state);
421}
422
423/*
424 * Push functions to SRAM
425 *
426 * The minimum set of functions is pushed to SRAM for execution:
427 * - omap3_do_wfi for erratum i581 WA,
428 */
429void omap_push_sram_idle(void)
430{
431 omap3_do_wfi_sram = omap_sram_push(omap3_do_wfi, omap3_do_wfi_sz);
432}
433
434static void __init pm_errata_configure(void)
435{
436 if (cpu_is_omap3630()) {
437 pm34xx_errata |= PM_RTA_ERRATUM_i608;
438 /* Enable the l2 cache toggling in sleep logic */
439 enable_omap3630_toggle_l2_on_restore();
440 if (omap_rev() < OMAP3630_REV_ES1_2)
441 pm34xx_errata |= (PM_SDRC_WAKEUP_ERRATUM_i583 |
442 PM_PER_MEMORIES_ERRATUM_i582);
443 } else if (cpu_is_omap34xx()) {
444 pm34xx_errata |= PM_PER_MEMORIES_ERRATUM_i582;
445 }
446}
447
448static void __init omap3_pm_check_pmic(void)
449{
450 struct device_node *np;
451
452 np = of_find_compatible_node(NULL, NULL, "ti,twl4030-power-idle");
453 if (!np)
454 np = of_find_compatible_node(NULL, NULL, "ti,twl4030-power-idle-osc-off");
455
456 if (np) {
457 of_node_put(np);
458 enable_off_mode = 1;
459 } else {
460 enable_off_mode = 0;
461 }
462}
463
464int __init omap3_pm_init(void)
465{
466 struct power_state *pwrst, *tmp;
467 struct clockdomain *neon_clkdm, *mpu_clkdm, *per_clkdm, *wkup_clkdm;
468 int ret;
469
470 if (!omap3_has_io_chain_ctrl())
471 pr_warn("PM: no software I/O chain control; some wakeups may be lost\n");
472
473 pm_errata_configure();
474
475 /* XXX prcm_setup_regs needs to be before enabling hw
476 * supervised mode for powerdomains */
477 prcm_setup_regs();
478
479 ret = request_irq(omap_prcm_event_to_irq("wkup"),
480 _prcm_int_handle_wakeup, IRQF_NO_SUSPEND, "pm_wkup", NULL);
481
482 if (ret) {
483 pr_err("pm: Failed to request pm_wkup irq\n");
484 goto err1;
485 }
486
487 /* IO interrupt is shared with mux code */
488 ret = request_irq(omap_prcm_event_to_irq("io"),
489 _prcm_int_handle_io, IRQF_SHARED | IRQF_NO_SUSPEND, "pm_io",
490 omap3_pm_init);
491
492 if (ret) {
493 pr_err("pm: Failed to request pm_io irq\n");
494 goto err2;
495 }
496
497 omap3_pm_check_pmic();
498
499 ret = pwrdm_for_each(pwrdms_setup, NULL);
500 if (ret) {
501 pr_err("Failed to setup powerdomains\n");
502 goto err3;
503 }
504
505 (void) clkdm_for_each(omap_pm_clkdms_setup, NULL);
506
507 mpu_pwrdm = pwrdm_lookup("mpu_pwrdm");
508 if (mpu_pwrdm == NULL) {
509 pr_err("Failed to get mpu_pwrdm\n");
510 ret = -EINVAL;
511 goto err3;
512 }
513
514 neon_pwrdm = pwrdm_lookup("neon_pwrdm");
515 per_pwrdm = pwrdm_lookup("per_pwrdm");
516 core_pwrdm = pwrdm_lookup("core_pwrdm");
517
518 neon_clkdm = clkdm_lookup("neon_clkdm");
519 mpu_clkdm = clkdm_lookup("mpu_clkdm");
520 per_clkdm = clkdm_lookup("per_clkdm");
521 wkup_clkdm = clkdm_lookup("wkup_clkdm");
522
523 omap_common_suspend_init(omap3_pm_suspend);
524
525 arm_pm_idle = omap3_pm_idle;
526 omap3_idle_init();
527
528 /*
529 * RTA is disabled during initialization as per erratum i608
530 * it is safer to disable RTA by the bootloader, but we would like
531 * to be doubly sure here and prevent any mishaps.
532 */
533 if (IS_PM34XX_ERRATUM(PM_RTA_ERRATUM_i608))
534 omap3630_ctrl_disable_rta();
535
536 /*
537 * The UART3/4 FIFO and the sidetone memory in McBSP2/3 are
538 * not correctly reset when the PER powerdomain comes back
539 * from OFF or OSWR when the CORE powerdomain is kept active.
540 * See OMAP36xx Erratum i582 "PER Domain reset issue after
541 * Domain-OFF/OSWR Wakeup". This wakeup dependency is not a
542 * complete workaround. The kernel must also prevent the PER
543 * powerdomain from going to OSWR/OFF while the CORE
544 * powerdomain is not going to OSWR/OFF. And if PER last
545 * power state was off while CORE last power state was ON, the
546 * UART3/4 and McBSP2/3 SIDETONE devices need to run a
547 * self-test using their loopback tests; if that fails, those
548 * devices are unusable until the PER/CORE can complete a transition
549 * from ON to OSWR/OFF and then back to ON.
550 *
551 * XXX Technically this workaround is only needed if off-mode
552 * or OSWR is enabled.
553 */
554 if (IS_PM34XX_ERRATUM(PM_PER_MEMORIES_ERRATUM_i582))
555 clkdm_add_wkdep(per_clkdm, wkup_clkdm);
556
557 clkdm_add_wkdep(neon_clkdm, mpu_clkdm);
558 if (omap_type() != OMAP2_DEVICE_TYPE_GP) {
559 omap3_secure_ram_storage =
560 kmalloc(OMAP3_SAVE_SECURE_RAM_SZ, GFP_KERNEL);
561 if (!omap3_secure_ram_storage)
562 pr_err("Memory allocation failed when allocating for secure sram context\n");
563
564 local_irq_disable();
565
566 omap3_save_secure_ram_context();
567
568 local_irq_enable();
569 }
570
571 omap3_save_scratchpad_contents();
572 return ret;
573
574err3:
575 list_for_each_entry_safe(pwrst, tmp, &pwrst_list, node) {
576 list_del(&pwrst->node);
577 kfree(pwrst);
578 }
579 free_irq(omap_prcm_event_to_irq("io"), omap3_pm_init);
580err2:
581 free_irq(omap_prcm_event_to_irq("wkup"), NULL);
582err1:
583 return ret;
584}