xref: /linux/arch/arm/mach-omap2/pm34xx.c (revision 603d6637aeb9a14cd0087d7c24c3777bfa51fcbf)
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 <trace/events/power.h>
32 
33 #include <asm/suspend.h>
34 #include <asm/system_misc.h>
35 
36 #include <plat/sram.h>
37 #include "clockdomain.h"
38 #include "powerdomain.h"
39 #include <plat/sdrc.h>
40 #include <plat/prcm.h>
41 #include <plat/gpmc.h>
42 #include <plat/dma.h>
43 
44 #include "common.h"
45 #include "cm2xxx_3xxx.h"
46 #include "cm-regbits-34xx.h"
47 #include "prm-regbits-34xx.h"
48 
49 #include "prm2xxx_3xxx.h"
50 #include "pm.h"
51 #include "sdrc.h"
52 #include "control.h"
53 
54 /* pm34xx errata defined in pm.h */
55 u16 pm34xx_errata;
56 
57 struct 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 
66 static LIST_HEAD(pwrst_list);
67 
68 static int (*_omap_save_secure_sram)(u32 *addr);
69 void (*omap3_do_wfi_sram)(void);
70 
71 static struct powerdomain *mpu_pwrdm, *neon_pwrdm;
72 static struct powerdomain *core_pwrdm, *per_pwrdm;
73 static struct powerdomain *cam_pwrdm;
74 
75 static void omap3_enable_io_chain(void)
76 {
77 	int timeout = 0;
78 
79 	omap2_prm_set_mod_reg_bits(OMAP3430_EN_IO_CHAIN_MASK, WKUP_MOD,
80 				   PM_WKEN);
81 	/* Do a readback to assure write has been done */
82 	omap2_prm_read_mod_reg(WKUP_MOD, PM_WKEN);
83 
84 	while (!(omap2_prm_read_mod_reg(WKUP_MOD, PM_WKEN) &
85 		 OMAP3430_ST_IO_CHAIN_MASK)) {
86 		timeout++;
87 		if (timeout > 1000) {
88 			pr_err("Wake up daisy chain activation failed.\n");
89 			return;
90 		}
91 		omap2_prm_set_mod_reg_bits(OMAP3430_ST_IO_CHAIN_MASK,
92 					   WKUP_MOD, PM_WKEN);
93 	}
94 }
95 
96 static void omap3_disable_io_chain(void)
97 {
98 	omap2_prm_clear_mod_reg_bits(OMAP3430_EN_IO_CHAIN_MASK, WKUP_MOD,
99 				     PM_WKEN);
100 }
101 
102 static void omap3_core_save_context(void)
103 {
104 	omap3_ctrl_save_padconf();
105 
106 	/*
107 	 * Force write last pad into memory, as this can fail in some
108 	 * cases according to errata 1.157, 1.185
109 	 */
110 	omap_ctrl_writel(omap_ctrl_readl(OMAP343X_PADCONF_ETK_D14),
111 		OMAP343X_CONTROL_MEM_WKUP + 0x2a0);
112 
113 	/* Save the Interrupt controller context */
114 	omap_intc_save_context();
115 	/* Save the GPMC context */
116 	omap3_gpmc_save_context();
117 	/* Save the system control module context, padconf already save above*/
118 	omap3_control_save_context();
119 	omap_dma_global_context_save();
120 }
121 
122 static void omap3_core_restore_context(void)
123 {
124 	/* Restore the control module context, padconf restored by h/w */
125 	omap3_control_restore_context();
126 	/* Restore the GPMC context */
127 	omap3_gpmc_restore_context();
128 	/* Restore the interrupt controller context */
129 	omap_intc_restore_context();
130 	omap_dma_global_context_restore();
131 }
132 
133 /*
134  * FIXME: This function should be called before entering off-mode after
135  * OMAP3 secure services have been accessed. Currently it is only called
136  * once during boot sequence, but this works as we are not using secure
137  * services.
138  */
139 static void omap3_save_secure_ram_context(void)
140 {
141 	u32 ret;
142 	int mpu_next_state = pwrdm_read_next_pwrst(mpu_pwrdm);
143 
144 	if (omap_type() != OMAP2_DEVICE_TYPE_GP) {
145 		/*
146 		 * MPU next state must be set to POWER_ON temporarily,
147 		 * otherwise the WFI executed inside the ROM code
148 		 * will hang the system.
149 		 */
150 		pwrdm_set_next_pwrst(mpu_pwrdm, PWRDM_POWER_ON);
151 		ret = _omap_save_secure_sram((u32 *)
152 				__pa(omap3_secure_ram_storage));
153 		pwrdm_set_next_pwrst(mpu_pwrdm, mpu_next_state);
154 		/* Following is for error tracking, it should not happen */
155 		if (ret) {
156 			pr_err("save_secure_sram() returns %08x\n", ret);
157 			while (1)
158 				;
159 		}
160 	}
161 }
162 
163 /*
164  * PRCM Interrupt Handler Helper Function
165  *
166  * The purpose of this function is to clear any wake-up events latched
167  * in the PRCM PM_WKST_x registers. It is possible that a wake-up event
168  * may occur whilst attempting to clear a PM_WKST_x register and thus
169  * set another bit in this register. A while loop is used to ensure
170  * that any peripheral wake-up events occurring while attempting to
171  * clear the PM_WKST_x are detected and cleared.
172  */
173 static int prcm_clear_mod_irqs(s16 module, u8 regs, u32 ignore_bits)
174 {
175 	u32 wkst, fclk, iclk, clken;
176 	u16 wkst_off = (regs == 3) ? OMAP3430ES2_PM_WKST3 : PM_WKST1;
177 	u16 fclk_off = (regs == 3) ? OMAP3430ES2_CM_FCLKEN3 : CM_FCLKEN1;
178 	u16 iclk_off = (regs == 3) ? CM_ICLKEN3 : CM_ICLKEN1;
179 	u16 grpsel_off = (regs == 3) ?
180 		OMAP3430ES2_PM_MPUGRPSEL3 : OMAP3430_PM_MPUGRPSEL;
181 	int c = 0;
182 
183 	wkst = omap2_prm_read_mod_reg(module, wkst_off);
184 	wkst &= omap2_prm_read_mod_reg(module, grpsel_off);
185 	wkst &= ~ignore_bits;
186 	if (wkst) {
187 		iclk = omap2_cm_read_mod_reg(module, iclk_off);
188 		fclk = omap2_cm_read_mod_reg(module, fclk_off);
189 		while (wkst) {
190 			clken = wkst;
191 			omap2_cm_set_mod_reg_bits(clken, module, iclk_off);
192 			/*
193 			 * For USBHOST, we don't know whether HOST1 or
194 			 * HOST2 woke us up, so enable both f-clocks
195 			 */
196 			if (module == OMAP3430ES2_USBHOST_MOD)
197 				clken |= 1 << OMAP3430ES2_EN_USBHOST2_SHIFT;
198 			omap2_cm_set_mod_reg_bits(clken, module, fclk_off);
199 			omap2_prm_write_mod_reg(wkst, module, wkst_off);
200 			wkst = omap2_prm_read_mod_reg(module, wkst_off);
201 			wkst &= ~ignore_bits;
202 			c++;
203 		}
204 		omap2_cm_write_mod_reg(iclk, module, iclk_off);
205 		omap2_cm_write_mod_reg(fclk, module, fclk_off);
206 	}
207 
208 	return c;
209 }
210 
211 static irqreturn_t _prcm_int_handle_io(int irq, void *unused)
212 {
213 	int c;
214 
215 	c = prcm_clear_mod_irqs(WKUP_MOD, 1,
216 		~(OMAP3430_ST_IO_MASK | OMAP3430_ST_IO_CHAIN_MASK));
217 
218 	return c ? IRQ_HANDLED : IRQ_NONE;
219 }
220 
221 static irqreturn_t _prcm_int_handle_wakeup(int irq, void *unused)
222 {
223 	int c;
224 
225 	/*
226 	 * Clear all except ST_IO and ST_IO_CHAIN for wkup module,
227 	 * these are handled in a separate handler to avoid acking
228 	 * IO events before parsing in mux code
229 	 */
230 	c = prcm_clear_mod_irqs(WKUP_MOD, 1,
231 		OMAP3430_ST_IO_MASK | OMAP3430_ST_IO_CHAIN_MASK);
232 	c += prcm_clear_mod_irqs(CORE_MOD, 1, 0);
233 	c += prcm_clear_mod_irqs(OMAP3430_PER_MOD, 1, 0);
234 	if (omap_rev() > OMAP3430_REV_ES1_0) {
235 		c += prcm_clear_mod_irqs(CORE_MOD, 3, 0);
236 		c += prcm_clear_mod_irqs(OMAP3430ES2_USBHOST_MOD, 1, 0);
237 	}
238 
239 	return c ? IRQ_HANDLED : IRQ_NONE;
240 }
241 
242 static void omap34xx_save_context(u32 *save)
243 {
244 	u32 val;
245 
246 	/* Read Auxiliary Control Register */
247 	asm("mrc p15, 0, %0, c1, c0, 1" : "=r" (val));
248 	*save++ = 1;
249 	*save++ = val;
250 
251 	/* Read L2 AUX ctrl register */
252 	asm("mrc p15, 1, %0, c9, c0, 2" : "=r" (val));
253 	*save++ = 1;
254 	*save++ = val;
255 }
256 
257 static int omap34xx_do_sram_idle(unsigned long save_state)
258 {
259 	omap34xx_cpu_suspend(save_state);
260 	return 0;
261 }
262 
263 void omap_sram_idle(void)
264 {
265 	/* Variable to tell what needs to be saved and restored
266 	 * in omap_sram_idle*/
267 	/* save_state = 0 => Nothing to save and restored */
268 	/* save_state = 1 => Only L1 and logic lost */
269 	/* save_state = 2 => Only L2 lost */
270 	/* save_state = 3 => L1, L2 and logic lost */
271 	int save_state = 0;
272 	int mpu_next_state = PWRDM_POWER_ON;
273 	int per_next_state = PWRDM_POWER_ON;
274 	int core_next_state = PWRDM_POWER_ON;
275 	int per_going_off;
276 	int core_prev_state;
277 	u32 sdrc_pwr = 0;
278 
279 	mpu_next_state = pwrdm_read_next_pwrst(mpu_pwrdm);
280 	switch (mpu_next_state) {
281 	case PWRDM_POWER_ON:
282 	case PWRDM_POWER_RET:
283 		/* No need to save context */
284 		save_state = 0;
285 		break;
286 	case PWRDM_POWER_OFF:
287 		save_state = 3;
288 		break;
289 	default:
290 		/* Invalid state */
291 		pr_err("Invalid mpu state in sram_idle\n");
292 		return;
293 	}
294 
295 	/* NEON control */
296 	if (pwrdm_read_pwrst(neon_pwrdm) == PWRDM_POWER_ON)
297 		pwrdm_set_next_pwrst(neon_pwrdm, mpu_next_state);
298 
299 	/* Enable IO-PAD and IO-CHAIN wakeups */
300 	per_next_state = pwrdm_read_next_pwrst(per_pwrdm);
301 	core_next_state = pwrdm_read_next_pwrst(core_pwrdm);
302 	if (omap3_has_io_wakeup() &&
303 	    (per_next_state < PWRDM_POWER_ON ||
304 	     core_next_state < PWRDM_POWER_ON)) {
305 		omap2_prm_set_mod_reg_bits(OMAP3430_EN_IO_MASK, WKUP_MOD, PM_WKEN);
306 		if (omap3_has_io_chain_ctrl())
307 			omap3_enable_io_chain();
308 	}
309 
310 	pwrdm_pre_transition();
311 
312 	/* PER */
313 	if (per_next_state < PWRDM_POWER_ON) {
314 		per_going_off = (per_next_state == PWRDM_POWER_OFF) ? 1 : 0;
315 		omap2_gpio_prepare_for_idle(per_going_off);
316 	}
317 
318 	/* CORE */
319 	if (core_next_state < PWRDM_POWER_ON) {
320 		if (core_next_state == PWRDM_POWER_OFF) {
321 			omap3_core_save_context();
322 			omap3_cm_save_context();
323 		}
324 	}
325 
326 	omap3_intc_prepare_idle();
327 
328 	/*
329 	 * On EMU/HS devices ROM code restores a SRDC value
330 	 * from scratchpad which has automatic self refresh on timeout
331 	 * of AUTO_CNT = 1 enabled. This takes care of erratum ID i443.
332 	 * Hence store/restore the SDRC_POWER register here.
333 	 */
334 	if (cpu_is_omap3430() && omap_rev() >= OMAP3430_REV_ES3_0 &&
335 	    (omap_type() == OMAP2_DEVICE_TYPE_EMU ||
336 	     omap_type() == OMAP2_DEVICE_TYPE_SEC) &&
337 	    core_next_state == PWRDM_POWER_OFF)
338 		sdrc_pwr = sdrc_read_reg(SDRC_POWER);
339 
340 	/*
341 	 * omap3_arm_context is the location where some ARM context
342 	 * get saved. The rest is placed on the stack, and restored
343 	 * from there before resuming.
344 	 */
345 	if (save_state)
346 		omap34xx_save_context(omap3_arm_context);
347 	if (save_state == 1 || save_state == 3)
348 		cpu_suspend(save_state, omap34xx_do_sram_idle);
349 	else
350 		omap34xx_do_sram_idle(save_state);
351 
352 	/* Restore normal SDRC POWER settings */
353 	if (cpu_is_omap3430() && omap_rev() >= OMAP3430_REV_ES3_0 &&
354 	    (omap_type() == OMAP2_DEVICE_TYPE_EMU ||
355 	     omap_type() == OMAP2_DEVICE_TYPE_SEC) &&
356 	    core_next_state == PWRDM_POWER_OFF)
357 		sdrc_write_reg(sdrc_pwr, SDRC_POWER);
358 
359 	/* CORE */
360 	if (core_next_state < PWRDM_POWER_ON) {
361 		core_prev_state = pwrdm_read_prev_pwrst(core_pwrdm);
362 		if (core_prev_state == PWRDM_POWER_OFF) {
363 			omap3_core_restore_context();
364 			omap3_cm_restore_context();
365 			omap3_sram_restore_context();
366 			omap2_sms_restore_context();
367 		}
368 		if (core_next_state == PWRDM_POWER_OFF)
369 			omap2_prm_clear_mod_reg_bits(OMAP3430_AUTO_OFF_MASK,
370 					       OMAP3430_GR_MOD,
371 					       OMAP3_PRM_VOLTCTRL_OFFSET);
372 	}
373 	omap3_intc_resume_idle();
374 
375 	pwrdm_post_transition();
376 
377 	/* PER */
378 	if (per_next_state < PWRDM_POWER_ON)
379 		omap2_gpio_resume_after_idle();
380 
381 	/* Disable IO-PAD and IO-CHAIN wakeup */
382 	if (omap3_has_io_wakeup() &&
383 	    (per_next_state < PWRDM_POWER_ON ||
384 	     core_next_state < PWRDM_POWER_ON)) {
385 		omap2_prm_clear_mod_reg_bits(OMAP3430_EN_IO_MASK, WKUP_MOD,
386 					     PM_WKEN);
387 		if (omap3_has_io_chain_ctrl())
388 			omap3_disable_io_chain();
389 	}
390 
391 	clkdm_allow_idle(mpu_pwrdm->pwrdm_clkdms[0]);
392 }
393 
394 static void omap3_pm_idle(void)
395 {
396 	local_fiq_disable();
397 
398 	if (omap_irq_pending())
399 		goto out;
400 
401 	trace_power_start(POWER_CSTATE, 1, smp_processor_id());
402 	trace_cpu_idle(1, smp_processor_id());
403 
404 	omap_sram_idle();
405 
406 	trace_power_end(smp_processor_id());
407 	trace_cpu_idle(PWR_EVENT_EXIT, smp_processor_id());
408 
409 out:
410 	local_fiq_enable();
411 }
412 
413 #ifdef CONFIG_SUSPEND
414 static int omap3_pm_suspend(void)
415 {
416 	struct power_state *pwrst;
417 	int state, ret = 0;
418 
419 	/* Read current next_pwrsts */
420 	list_for_each_entry(pwrst, &pwrst_list, node)
421 		pwrst->saved_state = pwrdm_read_next_pwrst(pwrst->pwrdm);
422 	/* Set ones wanted by suspend */
423 	list_for_each_entry(pwrst, &pwrst_list, node) {
424 		if (omap_set_pwrdm_state(pwrst->pwrdm, pwrst->next_state))
425 			goto restore;
426 		if (pwrdm_clear_all_prev_pwrst(pwrst->pwrdm))
427 			goto restore;
428 	}
429 
430 	omap3_intc_suspend();
431 
432 	omap_sram_idle();
433 
434 restore:
435 	/* Restore next_pwrsts */
436 	list_for_each_entry(pwrst, &pwrst_list, node) {
437 		state = pwrdm_read_prev_pwrst(pwrst->pwrdm);
438 		if (state > pwrst->next_state) {
439 			pr_info("Powerdomain (%s) didn't enter "
440 				"target state %d\n",
441 			       pwrst->pwrdm->name, pwrst->next_state);
442 			ret = -1;
443 		}
444 		omap_set_pwrdm_state(pwrst->pwrdm, pwrst->saved_state);
445 	}
446 	if (ret)
447 		pr_err("Could not enter target state in pm_suspend\n");
448 	else
449 		pr_info("Successfully put all powerdomains to target state\n");
450 
451 	return ret;
452 }
453 
454 #endif /* CONFIG_SUSPEND */
455 
456 
457 /**
458  * omap3_iva_idle(): ensure IVA is in idle so it can be put into
459  *                   retention
460  *
461  * In cases where IVA2 is activated by bootcode, it may prevent
462  * full-chip retention or off-mode because it is not idle.  This
463  * function forces the IVA2 into idle state so it can go
464  * into retention/off and thus allow full-chip retention/off.
465  *
466  **/
467 static void __init omap3_iva_idle(void)
468 {
469 	/* ensure IVA2 clock is disabled */
470 	omap2_cm_write_mod_reg(0, OMAP3430_IVA2_MOD, CM_FCLKEN);
471 
472 	/* if no clock activity, nothing else to do */
473 	if (!(omap2_cm_read_mod_reg(OMAP3430_IVA2_MOD, OMAP3430_CM_CLKSTST) &
474 	      OMAP3430_CLKACTIVITY_IVA2_MASK))
475 		return;
476 
477 	/* Reset IVA2 */
478 	omap2_prm_write_mod_reg(OMAP3430_RST1_IVA2_MASK |
479 			  OMAP3430_RST2_IVA2_MASK |
480 			  OMAP3430_RST3_IVA2_MASK,
481 			  OMAP3430_IVA2_MOD, OMAP2_RM_RSTCTRL);
482 
483 	/* Enable IVA2 clock */
484 	omap2_cm_write_mod_reg(OMAP3430_CM_FCLKEN_IVA2_EN_IVA2_MASK,
485 			 OMAP3430_IVA2_MOD, CM_FCLKEN);
486 
487 	/* Set IVA2 boot mode to 'idle' */
488 	omap_ctrl_writel(OMAP3_IVA2_BOOTMOD_IDLE,
489 			 OMAP343X_CONTROL_IVA2_BOOTMOD);
490 
491 	/* Un-reset IVA2 */
492 	omap2_prm_write_mod_reg(0, OMAP3430_IVA2_MOD, OMAP2_RM_RSTCTRL);
493 
494 	/* Disable IVA2 clock */
495 	omap2_cm_write_mod_reg(0, OMAP3430_IVA2_MOD, CM_FCLKEN);
496 
497 	/* Reset IVA2 */
498 	omap2_prm_write_mod_reg(OMAP3430_RST1_IVA2_MASK |
499 			  OMAP3430_RST2_IVA2_MASK |
500 			  OMAP3430_RST3_IVA2_MASK,
501 			  OMAP3430_IVA2_MOD, OMAP2_RM_RSTCTRL);
502 }
503 
504 static void __init omap3_d2d_idle(void)
505 {
506 	u16 mask, padconf;
507 
508 	/* In a stand alone OMAP3430 where there is not a stacked
509 	 * modem for the D2D Idle Ack and D2D MStandby must be pulled
510 	 * high. S CONTROL_PADCONF_SAD2D_IDLEACK and
511 	 * CONTROL_PADCONF_SAD2D_MSTDBY to have a pull up. */
512 	mask = (1 << 4) | (1 << 3); /* pull-up, enabled */
513 	padconf = omap_ctrl_readw(OMAP3_PADCONF_SAD2D_MSTANDBY);
514 	padconf |= mask;
515 	omap_ctrl_writew(padconf, OMAP3_PADCONF_SAD2D_MSTANDBY);
516 
517 	padconf = omap_ctrl_readw(OMAP3_PADCONF_SAD2D_IDLEACK);
518 	padconf |= mask;
519 	omap_ctrl_writew(padconf, OMAP3_PADCONF_SAD2D_IDLEACK);
520 
521 	/* reset modem */
522 	omap2_prm_write_mod_reg(OMAP3430_RM_RSTCTRL_CORE_MODEM_SW_RSTPWRON_MASK |
523 			  OMAP3430_RM_RSTCTRL_CORE_MODEM_SW_RST_MASK,
524 			  CORE_MOD, OMAP2_RM_RSTCTRL);
525 	omap2_prm_write_mod_reg(0, CORE_MOD, OMAP2_RM_RSTCTRL);
526 }
527 
528 static void __init prcm_setup_regs(void)
529 {
530 	u32 omap3630_en_uart4_mask = cpu_is_omap3630() ?
531 					OMAP3630_EN_UART4_MASK : 0;
532 	u32 omap3630_grpsel_uart4_mask = cpu_is_omap3630() ?
533 					OMAP3630_GRPSEL_UART4_MASK : 0;
534 
535 	/* XXX This should be handled by hwmod code or SCM init code */
536 	omap_ctrl_writel(OMAP3430_AUTOIDLE_MASK, OMAP2_CONTROL_SYSCONFIG);
537 
538 	/*
539 	 * Enable control of expternal oscillator through
540 	 * sys_clkreq. In the long run clock framework should
541 	 * take care of this.
542 	 */
543 	omap2_prm_rmw_mod_reg_bits(OMAP_AUTOEXTCLKMODE_MASK,
544 			     1 << OMAP_AUTOEXTCLKMODE_SHIFT,
545 			     OMAP3430_GR_MOD,
546 			     OMAP3_PRM_CLKSRC_CTRL_OFFSET);
547 
548 	/* setup wakup source */
549 	omap2_prm_write_mod_reg(OMAP3430_EN_IO_MASK | OMAP3430_EN_GPIO1_MASK |
550 			  OMAP3430_EN_GPT1_MASK | OMAP3430_EN_GPT12_MASK,
551 			  WKUP_MOD, PM_WKEN);
552 	/* No need to write EN_IO, that is always enabled */
553 	omap2_prm_write_mod_reg(OMAP3430_GRPSEL_GPIO1_MASK |
554 			  OMAP3430_GRPSEL_GPT1_MASK |
555 			  OMAP3430_GRPSEL_GPT12_MASK,
556 			  WKUP_MOD, OMAP3430_PM_MPUGRPSEL);
557 
558 	/* Enable PM_WKEN to support DSS LPR */
559 	omap2_prm_write_mod_reg(OMAP3430_PM_WKEN_DSS_EN_DSS_MASK,
560 				OMAP3430_DSS_MOD, PM_WKEN);
561 
562 	/* Enable wakeups in PER */
563 	omap2_prm_write_mod_reg(omap3630_en_uart4_mask |
564 			  OMAP3430_EN_GPIO2_MASK | OMAP3430_EN_GPIO3_MASK |
565 			  OMAP3430_EN_GPIO4_MASK | OMAP3430_EN_GPIO5_MASK |
566 			  OMAP3430_EN_GPIO6_MASK | OMAP3430_EN_UART3_MASK |
567 			  OMAP3430_EN_MCBSP2_MASK | OMAP3430_EN_MCBSP3_MASK |
568 			  OMAP3430_EN_MCBSP4_MASK,
569 			  OMAP3430_PER_MOD, PM_WKEN);
570 	/* and allow them to wake up MPU */
571 	omap2_prm_write_mod_reg(omap3630_grpsel_uart4_mask |
572 			  OMAP3430_GRPSEL_GPIO2_MASK |
573 			  OMAP3430_GRPSEL_GPIO3_MASK |
574 			  OMAP3430_GRPSEL_GPIO4_MASK |
575 			  OMAP3430_GRPSEL_GPIO5_MASK |
576 			  OMAP3430_GRPSEL_GPIO6_MASK |
577 			  OMAP3430_GRPSEL_UART3_MASK |
578 			  OMAP3430_GRPSEL_MCBSP2_MASK |
579 			  OMAP3430_GRPSEL_MCBSP3_MASK |
580 			  OMAP3430_GRPSEL_MCBSP4_MASK,
581 			  OMAP3430_PER_MOD, OMAP3430_PM_MPUGRPSEL);
582 
583 	/* Don't attach IVA interrupts */
584 	omap2_prm_write_mod_reg(0, WKUP_MOD, OMAP3430_PM_IVAGRPSEL);
585 	omap2_prm_write_mod_reg(0, CORE_MOD, OMAP3430_PM_IVAGRPSEL1);
586 	omap2_prm_write_mod_reg(0, CORE_MOD, OMAP3430ES2_PM_IVAGRPSEL3);
587 	omap2_prm_write_mod_reg(0, OMAP3430_PER_MOD, OMAP3430_PM_IVAGRPSEL);
588 
589 	/* Clear any pending 'reset' flags */
590 	omap2_prm_write_mod_reg(0xffffffff, MPU_MOD, OMAP2_RM_RSTST);
591 	omap2_prm_write_mod_reg(0xffffffff, CORE_MOD, OMAP2_RM_RSTST);
592 	omap2_prm_write_mod_reg(0xffffffff, OMAP3430_PER_MOD, OMAP2_RM_RSTST);
593 	omap2_prm_write_mod_reg(0xffffffff, OMAP3430_EMU_MOD, OMAP2_RM_RSTST);
594 	omap2_prm_write_mod_reg(0xffffffff, OMAP3430_NEON_MOD, OMAP2_RM_RSTST);
595 	omap2_prm_write_mod_reg(0xffffffff, OMAP3430_DSS_MOD, OMAP2_RM_RSTST);
596 	omap2_prm_write_mod_reg(0xffffffff, OMAP3430ES2_USBHOST_MOD, OMAP2_RM_RSTST);
597 
598 	/* Clear any pending PRCM interrupts */
599 	omap2_prm_write_mod_reg(0, OCP_MOD, OMAP3_PRM_IRQSTATUS_MPU_OFFSET);
600 
601 	omap3_iva_idle();
602 	omap3_d2d_idle();
603 }
604 
605 void omap3_pm_off_mode_enable(int enable)
606 {
607 	struct power_state *pwrst;
608 	u32 state;
609 
610 	if (enable)
611 		state = PWRDM_POWER_OFF;
612 	else
613 		state = PWRDM_POWER_RET;
614 
615 	list_for_each_entry(pwrst, &pwrst_list, node) {
616 		if (IS_PM34XX_ERRATUM(PM_SDRC_WAKEUP_ERRATUM_i583) &&
617 				pwrst->pwrdm == core_pwrdm &&
618 				state == PWRDM_POWER_OFF) {
619 			pwrst->next_state = PWRDM_POWER_RET;
620 			pr_warn("%s: Core OFF disabled due to errata i583\n",
621 				__func__);
622 		} else {
623 			pwrst->next_state = state;
624 		}
625 		omap_set_pwrdm_state(pwrst->pwrdm, pwrst->next_state);
626 	}
627 }
628 
629 int omap3_pm_get_suspend_state(struct powerdomain *pwrdm)
630 {
631 	struct power_state *pwrst;
632 
633 	list_for_each_entry(pwrst, &pwrst_list, node) {
634 		if (pwrst->pwrdm == pwrdm)
635 			return pwrst->next_state;
636 	}
637 	return -EINVAL;
638 }
639 
640 int omap3_pm_set_suspend_state(struct powerdomain *pwrdm, int state)
641 {
642 	struct power_state *pwrst;
643 
644 	list_for_each_entry(pwrst, &pwrst_list, node) {
645 		if (pwrst->pwrdm == pwrdm) {
646 			pwrst->next_state = state;
647 			return 0;
648 		}
649 	}
650 	return -EINVAL;
651 }
652 
653 static int __init pwrdms_setup(struct powerdomain *pwrdm, void *unused)
654 {
655 	struct power_state *pwrst;
656 
657 	if (!pwrdm->pwrsts)
658 		return 0;
659 
660 	pwrst = kmalloc(sizeof(struct power_state), GFP_ATOMIC);
661 	if (!pwrst)
662 		return -ENOMEM;
663 	pwrst->pwrdm = pwrdm;
664 	pwrst->next_state = PWRDM_POWER_RET;
665 	list_add(&pwrst->node, &pwrst_list);
666 
667 	if (pwrdm_has_hdwr_sar(pwrdm))
668 		pwrdm_enable_hdwr_sar(pwrdm);
669 
670 	return omap_set_pwrdm_state(pwrst->pwrdm, pwrst->next_state);
671 }
672 
673 /*
674  * Push functions to SRAM
675  *
676  * The minimum set of functions is pushed to SRAM for execution:
677  * - omap3_do_wfi for erratum i581 WA,
678  * - save_secure_ram_context for security extensions.
679  */
680 void omap_push_sram_idle(void)
681 {
682 	omap3_do_wfi_sram = omap_sram_push(omap3_do_wfi, omap3_do_wfi_sz);
683 
684 	if (omap_type() != OMAP2_DEVICE_TYPE_GP)
685 		_omap_save_secure_sram = omap_sram_push(save_secure_ram_context,
686 				save_secure_ram_context_sz);
687 }
688 
689 static void __init pm_errata_configure(void)
690 {
691 	if (cpu_is_omap3630()) {
692 		pm34xx_errata |= PM_RTA_ERRATUM_i608;
693 		/* Enable the l2 cache toggling in sleep logic */
694 		enable_omap3630_toggle_l2_on_restore();
695 		if (omap_rev() < OMAP3630_REV_ES1_2)
696 			pm34xx_errata |= PM_SDRC_WAKEUP_ERRATUM_i583;
697 	}
698 }
699 
700 static int __init omap3_pm_init(void)
701 {
702 	struct power_state *pwrst, *tmp;
703 	struct clockdomain *neon_clkdm, *mpu_clkdm;
704 	int ret;
705 
706 	if (!cpu_is_omap34xx())
707 		return -ENODEV;
708 
709 	if (!omap3_has_io_chain_ctrl())
710 		pr_warning("PM: no software I/O chain control; some wakeups may be lost\n");
711 
712 	pm_errata_configure();
713 
714 	/* XXX prcm_setup_regs needs to be before enabling hw
715 	 * supervised mode for powerdomains */
716 	prcm_setup_regs();
717 
718 	ret = request_irq(omap_prcm_event_to_irq("wkup"),
719 		_prcm_int_handle_wakeup, IRQF_NO_SUSPEND, "pm_wkup", NULL);
720 
721 	if (ret) {
722 		pr_err("pm: Failed to request pm_wkup irq\n");
723 		goto err1;
724 	}
725 
726 	/* IO interrupt is shared with mux code */
727 	ret = request_irq(omap_prcm_event_to_irq("io"),
728 		_prcm_int_handle_io, IRQF_SHARED | IRQF_NO_SUSPEND, "pm_io",
729 		omap3_pm_init);
730 
731 	if (ret) {
732 		pr_err("pm: Failed to request pm_io irq\n");
733 		goto err2;
734 	}
735 
736 	ret = pwrdm_for_each(pwrdms_setup, NULL);
737 	if (ret) {
738 		pr_err("Failed to setup powerdomains\n");
739 		goto err3;
740 	}
741 
742 	(void) clkdm_for_each(omap_pm_clkdms_setup, NULL);
743 
744 	mpu_pwrdm = pwrdm_lookup("mpu_pwrdm");
745 	if (mpu_pwrdm == NULL) {
746 		pr_err("Failed to get mpu_pwrdm\n");
747 		ret = -EINVAL;
748 		goto err3;
749 	}
750 
751 	neon_pwrdm = pwrdm_lookup("neon_pwrdm");
752 	per_pwrdm = pwrdm_lookup("per_pwrdm");
753 	core_pwrdm = pwrdm_lookup("core_pwrdm");
754 	cam_pwrdm = pwrdm_lookup("cam_pwrdm");
755 
756 	neon_clkdm = clkdm_lookup("neon_clkdm");
757 	mpu_clkdm = clkdm_lookup("mpu_clkdm");
758 
759 #ifdef CONFIG_SUSPEND
760 	omap_pm_suspend = omap3_pm_suspend;
761 #endif
762 
763 	arm_pm_idle = omap3_pm_idle;
764 	omap3_idle_init();
765 
766 	/*
767 	 * RTA is disabled during initialization as per erratum i608
768 	 * it is safer to disable RTA by the bootloader, but we would like
769 	 * to be doubly sure here and prevent any mishaps.
770 	 */
771 	if (IS_PM34XX_ERRATUM(PM_RTA_ERRATUM_i608))
772 		omap3630_ctrl_disable_rta();
773 
774 	clkdm_add_wkdep(neon_clkdm, mpu_clkdm);
775 	if (omap_type() != OMAP2_DEVICE_TYPE_GP) {
776 		omap3_secure_ram_storage =
777 			kmalloc(0x803F, GFP_KERNEL);
778 		if (!omap3_secure_ram_storage)
779 			pr_err("Memory allocation failed when "
780 			       "allocating for secure sram context\n");
781 
782 		local_irq_disable();
783 		local_fiq_disable();
784 
785 		omap_dma_global_context_save();
786 		omap3_save_secure_ram_context();
787 		omap_dma_global_context_restore();
788 
789 		local_irq_enable();
790 		local_fiq_enable();
791 	}
792 
793 	omap3_save_scratchpad_contents();
794 	return ret;
795 
796 err3:
797 	list_for_each_entry_safe(pwrst, tmp, &pwrst_list, node) {
798 		list_del(&pwrst->node);
799 		kfree(pwrst);
800 	}
801 	free_irq(omap_prcm_event_to_irq("io"), omap3_pm_init);
802 err2:
803 	free_irq(omap_prcm_event_to_irq("wkup"), NULL);
804 err1:
805 	return ret;
806 }
807 
808 late_initcall(omap3_pm_init);
809