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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 <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 */
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;
73static struct powerdomain *cam_pwrdm;
74
75static 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
96static 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
102static 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
122static 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 */
139static 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 */
173static 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
211static 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
221static 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
242static 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
257static int omap34xx_do_sram_idle(unsigned long save_state)
258{
259 omap34xx_cpu_suspend(save_state);
260 return 0;
261}
262
263void 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
394static 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
409out:
410 local_fiq_enable();
411}
412
413#ifdef CONFIG_SUSPEND
414static 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
434restore:
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 **/
467static 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
504static 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
528static 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
605void 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
629int 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
640int 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
653static 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 */
680void 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
689static 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
700int __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 (!omap3_has_io_chain_ctrl())
707 pr_warning("PM: no software I/O chain control; some wakeups may be lost\n");
708
709 pm_errata_configure();
710
711 /* XXX prcm_setup_regs needs to be before enabling hw
712 * supervised mode for powerdomains */
713 prcm_setup_regs();
714
715 ret = request_irq(omap_prcm_event_to_irq("wkup"),
716 _prcm_int_handle_wakeup, IRQF_NO_SUSPEND, "pm_wkup", NULL);
717
718 if (ret) {
719 pr_err("pm: Failed to request pm_wkup irq\n");
720 goto err1;
721 }
722
723 /* IO interrupt is shared with mux code */
724 ret = request_irq(omap_prcm_event_to_irq("io"),
725 _prcm_int_handle_io, IRQF_SHARED | IRQF_NO_SUSPEND, "pm_io",
726 omap3_pm_init);
727 enable_irq(omap_prcm_event_to_irq("io"));
728
729 if (ret) {
730 pr_err("pm: Failed to request pm_io irq\n");
731 goto err2;
732 }
733
734 ret = pwrdm_for_each(pwrdms_setup, NULL);
735 if (ret) {
736 pr_err("Failed to setup powerdomains\n");
737 goto err3;
738 }
739
740 (void) clkdm_for_each(omap_pm_clkdms_setup, NULL);
741
742 mpu_pwrdm = pwrdm_lookup("mpu_pwrdm");
743 if (mpu_pwrdm == NULL) {
744 pr_err("Failed to get mpu_pwrdm\n");
745 ret = -EINVAL;
746 goto err3;
747 }
748
749 neon_pwrdm = pwrdm_lookup("neon_pwrdm");
750 per_pwrdm = pwrdm_lookup("per_pwrdm");
751 core_pwrdm = pwrdm_lookup("core_pwrdm");
752 cam_pwrdm = pwrdm_lookup("cam_pwrdm");
753
754 neon_clkdm = clkdm_lookup("neon_clkdm");
755 mpu_clkdm = clkdm_lookup("mpu_clkdm");
756
757#ifdef CONFIG_SUSPEND
758 omap_pm_suspend = omap3_pm_suspend;
759#endif
760
761 arm_pm_idle = omap3_pm_idle;
762 omap3_idle_init();
763
764 /*
765 * RTA is disabled during initialization as per erratum i608
766 * it is safer to disable RTA by the bootloader, but we would like
767 * to be doubly sure here and prevent any mishaps.
768 */
769 if (IS_PM34XX_ERRATUM(PM_RTA_ERRATUM_i608))
770 omap3630_ctrl_disable_rta();
771
772 clkdm_add_wkdep(neon_clkdm, mpu_clkdm);
773 if (omap_type() != OMAP2_DEVICE_TYPE_GP) {
774 omap3_secure_ram_storage =
775 kmalloc(0x803F, GFP_KERNEL);
776 if (!omap3_secure_ram_storage)
777 pr_err("Memory allocation failed when "
778 "allocating for secure sram context\n");
779
780 local_irq_disable();
781 local_fiq_disable();
782
783 omap_dma_global_context_save();
784 omap3_save_secure_ram_context();
785 omap_dma_global_context_restore();
786
787 local_irq_enable();
788 local_fiq_enable();
789 }
790
791 omap3_save_scratchpad_contents();
792 return ret;
793
794err3:
795 list_for_each_entry_safe(pwrst, tmp, &pwrst_list, node) {
796 list_del(&pwrst->node);
797 kfree(pwrst);
798 }
799 free_irq(omap_prcm_event_to_irq("io"), omap3_pm_init);
800err2:
801 free_irq(omap_prcm_event_to_irq("wkup"), NULL);
802err1:
803 return ret;
804}
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}