1231 lines
32 KiB
C
1231 lines
32 KiB
C
/*
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* OMAP powerdomain control
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*
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* Copyright (C) 2007-2008 Texas Instruments, Inc.
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* Copyright (C) 2007-2008 Nokia Corporation
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*
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* Written by Paul Walmsley
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifdef CONFIG_OMAP_DEBUG_POWERDOMAIN
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# define DEBUG
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#endif
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/delay.h>
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#include <linux/spinlock.h>
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#include <linux/list.h>
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#include <linux/errno.h>
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#include <linux/err.h>
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#include <linux/io.h>
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#include <asm/atomic.h>
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#include "cm.h"
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#include "cm-regbits-34xx.h"
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#include "prm.h"
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#include "prm-regbits-34xx.h"
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#include <mach/cpu.h>
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#include <mach/powerdomain.h>
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#include <mach/clockdomain.h>
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#include "pm.h"
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enum {
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PWRDM_STATE_NOW = 0,
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PWRDM_STATE_PREV,
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};
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/* pwrdm_list contains all registered struct powerdomains */
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static LIST_HEAD(pwrdm_list);
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/*
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* pwrdm_rwlock protects pwrdm_list add and del ops - also reused to
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* protect pwrdm_clkdms[] during clkdm add/del ops
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*/
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static DEFINE_RWLOCK(pwrdm_rwlock);
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/* Private functions */
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static u32 prm_read_mod_bits_shift(s16 domain, s16 idx, u32 mask)
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{
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u32 v;
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v = prm_read_mod_reg(domain, idx);
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v &= mask;
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v >>= __ffs(mask);
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return v;
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}
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static struct powerdomain *_pwrdm_lookup(const char *name)
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{
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struct powerdomain *pwrdm, *temp_pwrdm;
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pwrdm = NULL;
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list_for_each_entry(temp_pwrdm, &pwrdm_list, node) {
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if (!strcmp(name, temp_pwrdm->name)) {
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pwrdm = temp_pwrdm;
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break;
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}
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}
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return pwrdm;
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}
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/* _pwrdm_deps_lookup - look up the specified powerdomain in a pwrdm list */
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static struct powerdomain *_pwrdm_deps_lookup(struct powerdomain *pwrdm,
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struct pwrdm_dep *deps)
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{
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struct pwrdm_dep *pd;
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if (!pwrdm || !deps || !omap_chip_is(pwrdm->omap_chip))
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return ERR_PTR(-EINVAL);
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for (pd = deps; pd->pwrdm_name; pd++) {
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if (!omap_chip_is(pd->omap_chip))
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continue;
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if (!pd->pwrdm && pd->pwrdm_name)
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pd->pwrdm = pwrdm_lookup(pd->pwrdm_name);
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if (pd->pwrdm == pwrdm)
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break;
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}
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if (!pd->pwrdm_name)
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return ERR_PTR(-ENOENT);
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return pd->pwrdm;
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}
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static int _pwrdm_state_switch(struct powerdomain *pwrdm, int flag)
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{
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int prev;
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int state;
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if (pwrdm == NULL)
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return -EINVAL;
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state = pwrdm_read_pwrst(pwrdm);
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switch (flag) {
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case PWRDM_STATE_NOW:
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prev = pwrdm->state;
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break;
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case PWRDM_STATE_PREV:
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prev = pwrdm_read_prev_pwrst(pwrdm);
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if (pwrdm->state != prev)
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pwrdm->state_counter[prev]++;
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break;
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default:
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return -EINVAL;
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}
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if (state != prev)
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pwrdm->state_counter[state]++;
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pm_dbg_update_time(pwrdm, prev);
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pwrdm->state = state;
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return 0;
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}
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static int _pwrdm_pre_transition_cb(struct powerdomain *pwrdm, void *unused)
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{
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pwrdm_clear_all_prev_pwrst(pwrdm);
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_pwrdm_state_switch(pwrdm, PWRDM_STATE_NOW);
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return 0;
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}
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static int _pwrdm_post_transition_cb(struct powerdomain *pwrdm, void *unused)
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{
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_pwrdm_state_switch(pwrdm, PWRDM_STATE_PREV);
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return 0;
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}
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static __init void _pwrdm_setup(struct powerdomain *pwrdm)
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{
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int i;
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for (i = 0; i < 4; i++)
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pwrdm->state_counter[i] = 0;
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pwrdm_wait_transition(pwrdm);
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pwrdm->state = pwrdm_read_pwrst(pwrdm);
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pwrdm->state_counter[pwrdm->state] = 1;
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}
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/* Public functions */
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/**
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* pwrdm_init - set up the powerdomain layer
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*
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* Loop through the list of powerdomains, registering all that are
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* available on the current CPU. If pwrdm_list is supplied and not
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* null, all of the referenced powerdomains will be registered. No
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* return value.
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*/
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void pwrdm_init(struct powerdomain **pwrdm_list)
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{
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struct powerdomain **p = NULL;
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if (pwrdm_list) {
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for (p = pwrdm_list; *p; p++) {
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pwrdm_register(*p);
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_pwrdm_setup(*p);
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}
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}
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}
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/**
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* pwrdm_register - register a powerdomain
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* @pwrdm: struct powerdomain * to register
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*
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* Adds a powerdomain to the internal powerdomain list. Returns
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* -EINVAL if given a null pointer, -EEXIST if a powerdomain is
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* already registered by the provided name, or 0 upon success.
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*/
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int pwrdm_register(struct powerdomain *pwrdm)
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{
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unsigned long flags;
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int ret = -EINVAL;
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if (!pwrdm)
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return -EINVAL;
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if (!omap_chip_is(pwrdm->omap_chip))
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return -EINVAL;
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write_lock_irqsave(&pwrdm_rwlock, flags);
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if (_pwrdm_lookup(pwrdm->name)) {
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ret = -EEXIST;
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goto pr_unlock;
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}
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list_add(&pwrdm->node, &pwrdm_list);
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pr_debug("powerdomain: registered %s\n", pwrdm->name);
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ret = 0;
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pr_unlock:
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write_unlock_irqrestore(&pwrdm_rwlock, flags);
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return ret;
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}
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/**
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* pwrdm_unregister - unregister a powerdomain
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* @pwrdm: struct powerdomain * to unregister
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*
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* Removes a powerdomain from the internal powerdomain list. Returns
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* -EINVAL if pwrdm argument is NULL.
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*/
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int pwrdm_unregister(struct powerdomain *pwrdm)
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{
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unsigned long flags;
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if (!pwrdm)
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return -EINVAL;
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write_lock_irqsave(&pwrdm_rwlock, flags);
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list_del(&pwrdm->node);
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write_unlock_irqrestore(&pwrdm_rwlock, flags);
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pr_debug("powerdomain: unregistered %s\n", pwrdm->name);
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return 0;
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}
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/**
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* pwrdm_lookup - look up a powerdomain by name, return a pointer
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* @name: name of powerdomain
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*
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* Find a registered powerdomain by its name. Returns a pointer to the
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* struct powerdomain if found, or NULL otherwise.
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*/
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struct powerdomain *pwrdm_lookup(const char *name)
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{
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struct powerdomain *pwrdm;
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unsigned long flags;
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if (!name)
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return NULL;
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read_lock_irqsave(&pwrdm_rwlock, flags);
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pwrdm = _pwrdm_lookup(name);
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read_unlock_irqrestore(&pwrdm_rwlock, flags);
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return pwrdm;
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}
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/**
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* pwrdm_for_each_nolock - call function on each registered clockdomain
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* @fn: callback function *
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*
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* Call the supplied function for each registered powerdomain. The
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* callback function can return anything but 0 to bail out early from
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* the iterator. Returns the last return value of the callback function, which
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* should be 0 for success or anything else to indicate failure; or -EINVAL if
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* the function pointer is null.
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*/
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int pwrdm_for_each_nolock(int (*fn)(struct powerdomain *pwrdm, void *user),
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void *user)
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{
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struct powerdomain *temp_pwrdm;
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int ret = 0;
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if (!fn)
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return -EINVAL;
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list_for_each_entry(temp_pwrdm, &pwrdm_list, node) {
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ret = (*fn)(temp_pwrdm, user);
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if (ret)
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break;
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}
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return ret;
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}
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/**
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* pwrdm_for_each - call function on each registered clockdomain
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* @fn: callback function *
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*
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* This function is the same as 'pwrdm_for_each_nolock()', but keeps the
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* &pwrdm_rwlock locked for reading, so no powerdomain structure manipulation
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* functions should be called from the callback, although hardware powerdomain
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* control functions are fine.
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*/
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int pwrdm_for_each(int (*fn)(struct powerdomain *pwrdm, void *user),
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void *user)
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{
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unsigned long flags;
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int ret;
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read_lock_irqsave(&pwrdm_rwlock, flags);
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ret = pwrdm_for_each_nolock(fn, user);
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read_unlock_irqrestore(&pwrdm_rwlock, flags);
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return ret;
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}
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/**
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* pwrdm_add_clkdm - add a clockdomain to a powerdomain
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* @pwrdm: struct powerdomain * to add the clockdomain to
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* @clkdm: struct clockdomain * to associate with a powerdomain
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*
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* Associate the clockdomain 'clkdm' with a powerdomain 'pwrdm'. This
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* enables the use of pwrdm_for_each_clkdm(). Returns -EINVAL if
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* presented with invalid pointers; -ENOMEM if memory could not be allocated;
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* or 0 upon success.
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*/
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int pwrdm_add_clkdm(struct powerdomain *pwrdm, struct clockdomain *clkdm)
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{
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unsigned long flags;
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int i;
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int ret = -EINVAL;
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if (!pwrdm || !clkdm)
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return -EINVAL;
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pr_debug("powerdomain: associating clockdomain %s with powerdomain "
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"%s\n", clkdm->name, pwrdm->name);
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write_lock_irqsave(&pwrdm_rwlock, flags);
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for (i = 0; i < PWRDM_MAX_CLKDMS; i++) {
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if (!pwrdm->pwrdm_clkdms[i])
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break;
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#ifdef DEBUG
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if (pwrdm->pwrdm_clkdms[i] == clkdm) {
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ret = -EINVAL;
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goto pac_exit;
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}
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#endif
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}
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if (i == PWRDM_MAX_CLKDMS) {
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pr_debug("powerdomain: increase PWRDM_MAX_CLKDMS for "
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"pwrdm %s clkdm %s\n", pwrdm->name, clkdm->name);
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WARN_ON(1);
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ret = -ENOMEM;
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goto pac_exit;
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}
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pwrdm->pwrdm_clkdms[i] = clkdm;
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ret = 0;
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pac_exit:
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write_unlock_irqrestore(&pwrdm_rwlock, flags);
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return ret;
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}
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/**
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* pwrdm_del_clkdm - remove a clockdomain from a powerdomain
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* @pwrdm: struct powerdomain * to add the clockdomain to
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* @clkdm: struct clockdomain * to associate with a powerdomain
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*
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* Dissociate the clockdomain 'clkdm' from the powerdomain
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* 'pwrdm'. Returns -EINVAL if presented with invalid pointers;
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* -ENOENT if the clkdm was not associated with the powerdomain, or 0
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* upon success.
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*/
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int pwrdm_del_clkdm(struct powerdomain *pwrdm, struct clockdomain *clkdm)
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{
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unsigned long flags;
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int ret = -EINVAL;
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int i;
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if (!pwrdm || !clkdm)
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return -EINVAL;
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pr_debug("powerdomain: dissociating clockdomain %s from powerdomain "
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"%s\n", clkdm->name, pwrdm->name);
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write_lock_irqsave(&pwrdm_rwlock, flags);
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for (i = 0; i < PWRDM_MAX_CLKDMS; i++)
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if (pwrdm->pwrdm_clkdms[i] == clkdm)
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break;
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if (i == PWRDM_MAX_CLKDMS) {
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pr_debug("powerdomain: clkdm %s not associated with pwrdm "
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"%s ?!\n", clkdm->name, pwrdm->name);
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ret = -ENOENT;
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goto pdc_exit;
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}
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pwrdm->pwrdm_clkdms[i] = NULL;
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ret = 0;
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pdc_exit:
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write_unlock_irqrestore(&pwrdm_rwlock, flags);
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return ret;
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}
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/**
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* pwrdm_for_each_clkdm - call function on each clkdm in a pwrdm
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* @pwrdm: struct powerdomain * to iterate over
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* @fn: callback function *
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*
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* Call the supplied function for each clockdomain in the powerdomain
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* 'pwrdm'. The callback function can return anything but 0 to bail
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* out early from the iterator. The callback function is called with
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* the pwrdm_rwlock held for reading, so no powerdomain structure
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* manipulation functions should be called from the callback, although
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* hardware powerdomain control functions are fine. Returns -EINVAL
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* if presented with invalid pointers; or passes along the last return
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* value of the callback function, which should be 0 for success or
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* anything else to indicate failure.
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*/
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int pwrdm_for_each_clkdm(struct powerdomain *pwrdm,
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int (*fn)(struct powerdomain *pwrdm,
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struct clockdomain *clkdm))
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{
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unsigned long flags;
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int ret = 0;
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int i;
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if (!fn)
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return -EINVAL;
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read_lock_irqsave(&pwrdm_rwlock, flags);
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for (i = 0; i < PWRDM_MAX_CLKDMS && !ret; i++)
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ret = (*fn)(pwrdm, pwrdm->pwrdm_clkdms[i]);
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read_unlock_irqrestore(&pwrdm_rwlock, flags);
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return ret;
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}
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|
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/**
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* pwrdm_add_wkdep - add a wakeup dependency from pwrdm2 to pwrdm1
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* @pwrdm1: wake this struct powerdomain * up (dependent)
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* @pwrdm2: when this struct powerdomain * wakes up (source)
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*
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* When the powerdomain represented by pwrdm2 wakes up (due to an
|
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* interrupt), wake up pwrdm1. Implemented in hardware on the OMAP,
|
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* this feature is designed to reduce wakeup latency of the dependent
|
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* powerdomain. Returns -EINVAL if presented with invalid powerdomain
|
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* pointers, -ENOENT if pwrdm2 cannot wake up pwrdm1 in hardware, or
|
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* 0 upon success.
|
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*/
|
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int pwrdm_add_wkdep(struct powerdomain *pwrdm1, struct powerdomain *pwrdm2)
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{
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struct powerdomain *p;
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if (!pwrdm1)
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return -EINVAL;
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p = _pwrdm_deps_lookup(pwrdm2, pwrdm1->wkdep_srcs);
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if (IS_ERR(p)) {
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pr_debug("powerdomain: hardware cannot set/clear wake up of "
|
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"%s when %s wakes up\n", pwrdm1->name, pwrdm2->name);
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return IS_ERR(p);
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}
|
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pr_debug("powerdomain: hardware will wake up %s when %s wakes up\n",
|
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pwrdm1->name, pwrdm2->name);
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|
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prm_set_mod_reg_bits((1 << pwrdm2->dep_bit),
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pwrdm1->prcm_offs, PM_WKDEP);
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|
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return 0;
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}
|
|
|
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/**
|
|
* pwrdm_del_wkdep - remove a wakeup dependency from pwrdm2 to pwrdm1
|
|
* @pwrdm1: wake this struct powerdomain * up (dependent)
|
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* @pwrdm2: when this struct powerdomain * wakes up (source)
|
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*
|
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* Remove a wakeup dependency that causes pwrdm1 to wake up when pwrdm2
|
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* wakes up. Returns -EINVAL if presented with invalid powerdomain
|
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* pointers, -ENOENT if pwrdm2 cannot wake up pwrdm1 in hardware, or
|
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* 0 upon success.
|
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*/
|
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int pwrdm_del_wkdep(struct powerdomain *pwrdm1, struct powerdomain *pwrdm2)
|
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{
|
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struct powerdomain *p;
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|
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if (!pwrdm1)
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return -EINVAL;
|
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|
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p = _pwrdm_deps_lookup(pwrdm2, pwrdm1->wkdep_srcs);
|
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if (IS_ERR(p)) {
|
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pr_debug("powerdomain: hardware cannot set/clear wake up of "
|
|
"%s when %s wakes up\n", pwrdm1->name, pwrdm2->name);
|
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return IS_ERR(p);
|
|
}
|
|
|
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pr_debug("powerdomain: hardware will no longer wake up %s after %s "
|
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"wakes up\n", pwrdm1->name, pwrdm2->name);
|
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|
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prm_clear_mod_reg_bits((1 << pwrdm2->dep_bit),
|
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pwrdm1->prcm_offs, PM_WKDEP);
|
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|
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return 0;
|
|
}
|
|
|
|
/**
|
|
* pwrdm_read_wkdep - read wakeup dependency state from pwrdm2 to pwrdm1
|
|
* @pwrdm1: wake this struct powerdomain * up (dependent)
|
|
* @pwrdm2: when this struct powerdomain * wakes up (source)
|
|
*
|
|
* Return 1 if a hardware wakeup dependency exists wherein pwrdm1 will be
|
|
* awoken when pwrdm2 wakes up; 0 if dependency is not set; -EINVAL
|
|
* if either powerdomain pointer is invalid; or -ENOENT if the hardware
|
|
* is incapable.
|
|
*
|
|
* REVISIT: Currently this function only represents software-controllable
|
|
* wakeup dependencies. Wakeup dependencies fixed in hardware are not
|
|
* yet handled here.
|
|
*/
|
|
int pwrdm_read_wkdep(struct powerdomain *pwrdm1, struct powerdomain *pwrdm2)
|
|
{
|
|
struct powerdomain *p;
|
|
|
|
if (!pwrdm1)
|
|
return -EINVAL;
|
|
|
|
p = _pwrdm_deps_lookup(pwrdm2, pwrdm1->wkdep_srcs);
|
|
if (IS_ERR(p)) {
|
|
pr_debug("powerdomain: hardware cannot set/clear wake up of "
|
|
"%s when %s wakes up\n", pwrdm1->name, pwrdm2->name);
|
|
return IS_ERR(p);
|
|
}
|
|
|
|
return prm_read_mod_bits_shift(pwrdm1->prcm_offs, PM_WKDEP,
|
|
(1 << pwrdm2->dep_bit));
|
|
}
|
|
|
|
/**
|
|
* pwrdm_add_sleepdep - add a sleep dependency from pwrdm2 to pwrdm1
|
|
* @pwrdm1: prevent this struct powerdomain * from sleeping (dependent)
|
|
* @pwrdm2: when this struct powerdomain * is active (source)
|
|
*
|
|
* Prevent pwrdm1 from automatically going inactive (and then to
|
|
* retention or off) if pwrdm2 is still active. Returns -EINVAL if
|
|
* presented with invalid powerdomain pointers or called on a machine
|
|
* that does not support software-configurable hardware sleep dependencies,
|
|
* -ENOENT if the specified dependency cannot be set in hardware, or
|
|
* 0 upon success.
|
|
*/
|
|
int pwrdm_add_sleepdep(struct powerdomain *pwrdm1, struct powerdomain *pwrdm2)
|
|
{
|
|
struct powerdomain *p;
|
|
|
|
if (!pwrdm1)
|
|
return -EINVAL;
|
|
|
|
if (!cpu_is_omap34xx())
|
|
return -EINVAL;
|
|
|
|
p = _pwrdm_deps_lookup(pwrdm2, pwrdm1->sleepdep_srcs);
|
|
if (IS_ERR(p)) {
|
|
pr_debug("powerdomain: hardware cannot set/clear sleep "
|
|
"dependency affecting %s from %s\n", pwrdm1->name,
|
|
pwrdm2->name);
|
|
return IS_ERR(p);
|
|
}
|
|
|
|
pr_debug("powerdomain: will prevent %s from sleeping if %s is active\n",
|
|
pwrdm1->name, pwrdm2->name);
|
|
|
|
cm_set_mod_reg_bits((1 << pwrdm2->dep_bit),
|
|
pwrdm1->prcm_offs, OMAP3430_CM_SLEEPDEP);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* pwrdm_del_sleepdep - remove a sleep dependency from pwrdm2 to pwrdm1
|
|
* @pwrdm1: prevent this struct powerdomain * from sleeping (dependent)
|
|
* @pwrdm2: when this struct powerdomain * is active (source)
|
|
*
|
|
* Allow pwrdm1 to automatically go inactive (and then to retention or
|
|
* off), independent of the activity state of pwrdm2. Returns -EINVAL
|
|
* if presented with invalid powerdomain pointers or called on a machine
|
|
* that does not support software-configurable hardware sleep dependencies,
|
|
* -ENOENT if the specified dependency cannot be cleared in hardware, or
|
|
* 0 upon success.
|
|
*/
|
|
int pwrdm_del_sleepdep(struct powerdomain *pwrdm1, struct powerdomain *pwrdm2)
|
|
{
|
|
struct powerdomain *p;
|
|
|
|
if (!pwrdm1)
|
|
return -EINVAL;
|
|
|
|
if (!cpu_is_omap34xx())
|
|
return -EINVAL;
|
|
|
|
p = _pwrdm_deps_lookup(pwrdm2, pwrdm1->sleepdep_srcs);
|
|
if (IS_ERR(p)) {
|
|
pr_debug("powerdomain: hardware cannot set/clear sleep "
|
|
"dependency affecting %s from %s\n", pwrdm1->name,
|
|
pwrdm2->name);
|
|
return IS_ERR(p);
|
|
}
|
|
|
|
pr_debug("powerdomain: will no longer prevent %s from sleeping if "
|
|
"%s is active\n", pwrdm1->name, pwrdm2->name);
|
|
|
|
cm_clear_mod_reg_bits((1 << pwrdm2->dep_bit),
|
|
pwrdm1->prcm_offs, OMAP3430_CM_SLEEPDEP);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* pwrdm_read_sleepdep - read sleep dependency state from pwrdm2 to pwrdm1
|
|
* @pwrdm1: prevent this struct powerdomain * from sleeping (dependent)
|
|
* @pwrdm2: when this struct powerdomain * is active (source)
|
|
*
|
|
* Return 1 if a hardware sleep dependency exists wherein pwrdm1 will
|
|
* not be allowed to automatically go inactive if pwrdm2 is active;
|
|
* 0 if pwrdm1's automatic power state inactivity transition is independent
|
|
* of pwrdm2's; -EINVAL if either powerdomain pointer is invalid or called
|
|
* on a machine that does not support software-configurable hardware sleep
|
|
* dependencies; or -ENOENT if the hardware is incapable.
|
|
*
|
|
* REVISIT: Currently this function only represents software-controllable
|
|
* sleep dependencies. Sleep dependencies fixed in hardware are not
|
|
* yet handled here.
|
|
*/
|
|
int pwrdm_read_sleepdep(struct powerdomain *pwrdm1, struct powerdomain *pwrdm2)
|
|
{
|
|
struct powerdomain *p;
|
|
|
|
if (!pwrdm1)
|
|
return -EINVAL;
|
|
|
|
if (!cpu_is_omap34xx())
|
|
return -EINVAL;
|
|
|
|
p = _pwrdm_deps_lookup(pwrdm2, pwrdm1->sleepdep_srcs);
|
|
if (IS_ERR(p)) {
|
|
pr_debug("powerdomain: hardware cannot set/clear sleep "
|
|
"dependency affecting %s from %s\n", pwrdm1->name,
|
|
pwrdm2->name);
|
|
return IS_ERR(p);
|
|
}
|
|
|
|
return prm_read_mod_bits_shift(pwrdm1->prcm_offs, OMAP3430_CM_SLEEPDEP,
|
|
(1 << pwrdm2->dep_bit));
|
|
}
|
|
|
|
/**
|
|
* pwrdm_get_mem_bank_count - get number of memory banks in this powerdomain
|
|
* @pwrdm: struct powerdomain *
|
|
*
|
|
* Return the number of controllable memory banks in powerdomain pwrdm,
|
|
* starting with 1. Returns -EINVAL if the powerdomain pointer is null.
|
|
*/
|
|
int pwrdm_get_mem_bank_count(struct powerdomain *pwrdm)
|
|
{
|
|
if (!pwrdm)
|
|
return -EINVAL;
|
|
|
|
return pwrdm->banks;
|
|
}
|
|
|
|
/**
|
|
* pwrdm_set_next_pwrst - set next powerdomain power state
|
|
* @pwrdm: struct powerdomain * to set
|
|
* @pwrst: one of the PWRDM_POWER_* macros
|
|
*
|
|
* Set the powerdomain pwrdm's next power state to pwrst. The powerdomain
|
|
* may not enter this state immediately if the preconditions for this state
|
|
* have not been satisfied. Returns -EINVAL if the powerdomain pointer is
|
|
* null or if the power state is invalid for the powerdomin, or returns 0
|
|
* upon success.
|
|
*/
|
|
int pwrdm_set_next_pwrst(struct powerdomain *pwrdm, u8 pwrst)
|
|
{
|
|
if (!pwrdm)
|
|
return -EINVAL;
|
|
|
|
if (!(pwrdm->pwrsts & (1 << pwrst)))
|
|
return -EINVAL;
|
|
|
|
pr_debug("powerdomain: setting next powerstate for %s to %0x\n",
|
|
pwrdm->name, pwrst);
|
|
|
|
prm_rmw_mod_reg_bits(OMAP_POWERSTATE_MASK,
|
|
(pwrst << OMAP_POWERSTATE_SHIFT),
|
|
pwrdm->prcm_offs, PM_PWSTCTRL);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* pwrdm_read_next_pwrst - get next powerdomain power state
|
|
* @pwrdm: struct powerdomain * to get power state
|
|
*
|
|
* Return the powerdomain pwrdm's next power state. Returns -EINVAL
|
|
* if the powerdomain pointer is null or returns the next power state
|
|
* upon success.
|
|
*/
|
|
int pwrdm_read_next_pwrst(struct powerdomain *pwrdm)
|
|
{
|
|
if (!pwrdm)
|
|
return -EINVAL;
|
|
|
|
return prm_read_mod_bits_shift(pwrdm->prcm_offs, PM_PWSTCTRL,
|
|
OMAP_POWERSTATE_MASK);
|
|
}
|
|
|
|
/**
|
|
* pwrdm_read_pwrst - get current powerdomain power state
|
|
* @pwrdm: struct powerdomain * to get power state
|
|
*
|
|
* Return the powerdomain pwrdm's current power state. Returns -EINVAL
|
|
* if the powerdomain pointer is null or returns the current power state
|
|
* upon success.
|
|
*/
|
|
int pwrdm_read_pwrst(struct powerdomain *pwrdm)
|
|
{
|
|
if (!pwrdm)
|
|
return -EINVAL;
|
|
|
|
return prm_read_mod_bits_shift(pwrdm->prcm_offs, PM_PWSTST,
|
|
OMAP_POWERSTATEST_MASK);
|
|
}
|
|
|
|
/**
|
|
* pwrdm_read_prev_pwrst - get previous powerdomain power state
|
|
* @pwrdm: struct powerdomain * to get previous power state
|
|
*
|
|
* Return the powerdomain pwrdm's previous power state. Returns -EINVAL
|
|
* if the powerdomain pointer is null or returns the previous power state
|
|
* upon success.
|
|
*/
|
|
int pwrdm_read_prev_pwrst(struct powerdomain *pwrdm)
|
|
{
|
|
if (!pwrdm)
|
|
return -EINVAL;
|
|
|
|
return prm_read_mod_bits_shift(pwrdm->prcm_offs, OMAP3430_PM_PREPWSTST,
|
|
OMAP3430_LASTPOWERSTATEENTERED_MASK);
|
|
}
|
|
|
|
/**
|
|
* pwrdm_set_logic_retst - set powerdomain logic power state upon retention
|
|
* @pwrdm: struct powerdomain * to set
|
|
* @pwrst: one of the PWRDM_POWER_* macros
|
|
*
|
|
* Set the next power state that the logic portion of the powerdomain
|
|
* pwrdm will enter when the powerdomain enters retention. This will
|
|
* be either RETENTION or OFF, if supported. Returns -EINVAL if the
|
|
* powerdomain pointer is null or the target power state is not not
|
|
* supported, or returns 0 upon success.
|
|
*/
|
|
int pwrdm_set_logic_retst(struct powerdomain *pwrdm, u8 pwrst)
|
|
{
|
|
if (!pwrdm)
|
|
return -EINVAL;
|
|
|
|
if (!(pwrdm->pwrsts_logic_ret & (1 << pwrst)))
|
|
return -EINVAL;
|
|
|
|
pr_debug("powerdomain: setting next logic powerstate for %s to %0x\n",
|
|
pwrdm->name, pwrst);
|
|
|
|
/*
|
|
* The register bit names below may not correspond to the
|
|
* actual names of the bits in each powerdomain's register,
|
|
* but the type of value returned is the same for each
|
|
* powerdomain.
|
|
*/
|
|
prm_rmw_mod_reg_bits(OMAP3430_LOGICL1CACHERETSTATE,
|
|
(pwrst << __ffs(OMAP3430_LOGICL1CACHERETSTATE)),
|
|
pwrdm->prcm_offs, PM_PWSTCTRL);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* pwrdm_set_mem_onst - set memory power state while powerdomain ON
|
|
* @pwrdm: struct powerdomain * to set
|
|
* @bank: memory bank number to set (0-3)
|
|
* @pwrst: one of the PWRDM_POWER_* macros
|
|
*
|
|
* Set the next power state that memory bank x of the powerdomain
|
|
* pwrdm will enter when the powerdomain enters the ON state. Bank
|
|
* will be a number from 0 to 3, and represents different types of
|
|
* memory, depending on the powerdomain. Returns -EINVAL if the
|
|
* powerdomain pointer is null or the target power state is not not
|
|
* supported for this memory bank, -EEXIST if the target memory bank
|
|
* does not exist or is not controllable, or returns 0 upon success.
|
|
*/
|
|
int pwrdm_set_mem_onst(struct powerdomain *pwrdm, u8 bank, u8 pwrst)
|
|
{
|
|
u32 m;
|
|
|
|
if (!pwrdm)
|
|
return -EINVAL;
|
|
|
|
if (pwrdm->banks < (bank + 1))
|
|
return -EEXIST;
|
|
|
|
if (!(pwrdm->pwrsts_mem_on[bank] & (1 << pwrst)))
|
|
return -EINVAL;
|
|
|
|
pr_debug("powerdomain: setting next memory powerstate for domain %s "
|
|
"bank %0x while pwrdm-ON to %0x\n", pwrdm->name, bank, pwrst);
|
|
|
|
/*
|
|
* The register bit names below may not correspond to the
|
|
* actual names of the bits in each powerdomain's register,
|
|
* but the type of value returned is the same for each
|
|
* powerdomain.
|
|
*/
|
|
switch (bank) {
|
|
case 0:
|
|
m = OMAP3430_SHAREDL1CACHEFLATONSTATE_MASK;
|
|
break;
|
|
case 1:
|
|
m = OMAP3430_L1FLATMEMONSTATE_MASK;
|
|
break;
|
|
case 2:
|
|
m = OMAP3430_SHAREDL2CACHEFLATONSTATE_MASK;
|
|
break;
|
|
case 3:
|
|
m = OMAP3430_L2FLATMEMONSTATE_MASK;
|
|
break;
|
|
default:
|
|
WARN_ON(1); /* should never happen */
|
|
return -EEXIST;
|
|
}
|
|
|
|
prm_rmw_mod_reg_bits(m, (pwrst << __ffs(m)),
|
|
pwrdm->prcm_offs, PM_PWSTCTRL);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* pwrdm_set_mem_retst - set memory power state while powerdomain in RET
|
|
* @pwrdm: struct powerdomain * to set
|
|
* @bank: memory bank number to set (0-3)
|
|
* @pwrst: one of the PWRDM_POWER_* macros
|
|
*
|
|
* Set the next power state that memory bank x of the powerdomain
|
|
* pwrdm will enter when the powerdomain enters the RETENTION state.
|
|
* Bank will be a number from 0 to 3, and represents different types
|
|
* of memory, depending on the powerdomain. pwrst will be either
|
|
* RETENTION or OFF, if supported. Returns -EINVAL if the powerdomain
|
|
* pointer is null or the target power state is not not supported for
|
|
* this memory bank, -EEXIST if the target memory bank does not exist
|
|
* or is not controllable, or returns 0 upon success.
|
|
*/
|
|
int pwrdm_set_mem_retst(struct powerdomain *pwrdm, u8 bank, u8 pwrst)
|
|
{
|
|
u32 m;
|
|
|
|
if (!pwrdm)
|
|
return -EINVAL;
|
|
|
|
if (pwrdm->banks < (bank + 1))
|
|
return -EEXIST;
|
|
|
|
if (!(pwrdm->pwrsts_mem_ret[bank] & (1 << pwrst)))
|
|
return -EINVAL;
|
|
|
|
pr_debug("powerdomain: setting next memory powerstate for domain %s "
|
|
"bank %0x while pwrdm-RET to %0x\n", pwrdm->name, bank, pwrst);
|
|
|
|
/*
|
|
* The register bit names below may not correspond to the
|
|
* actual names of the bits in each powerdomain's register,
|
|
* but the type of value returned is the same for each
|
|
* powerdomain.
|
|
*/
|
|
switch (bank) {
|
|
case 0:
|
|
m = OMAP3430_SHAREDL1CACHEFLATRETSTATE;
|
|
break;
|
|
case 1:
|
|
m = OMAP3430_L1FLATMEMRETSTATE;
|
|
break;
|
|
case 2:
|
|
m = OMAP3430_SHAREDL2CACHEFLATRETSTATE;
|
|
break;
|
|
case 3:
|
|
m = OMAP3430_L2FLATMEMRETSTATE;
|
|
break;
|
|
default:
|
|
WARN_ON(1); /* should never happen */
|
|
return -EEXIST;
|
|
}
|
|
|
|
prm_rmw_mod_reg_bits(m, (pwrst << __ffs(m)), pwrdm->prcm_offs,
|
|
PM_PWSTCTRL);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* pwrdm_read_logic_pwrst - get current powerdomain logic retention power state
|
|
* @pwrdm: struct powerdomain * to get current logic retention power state
|
|
*
|
|
* Return the current power state that the logic portion of
|
|
* powerdomain pwrdm will enter
|
|
* Returns -EINVAL if the powerdomain pointer is null or returns the
|
|
* current logic retention power state upon success.
|
|
*/
|
|
int pwrdm_read_logic_pwrst(struct powerdomain *pwrdm)
|
|
{
|
|
if (!pwrdm)
|
|
return -EINVAL;
|
|
|
|
return prm_read_mod_bits_shift(pwrdm->prcm_offs, PM_PWSTST,
|
|
OMAP3430_LOGICSTATEST);
|
|
}
|
|
|
|
/**
|
|
* pwrdm_read_prev_logic_pwrst - get previous powerdomain logic power state
|
|
* @pwrdm: struct powerdomain * to get previous logic power state
|
|
*
|
|
* Return the powerdomain pwrdm's logic power state. Returns -EINVAL
|
|
* if the powerdomain pointer is null or returns the previous logic
|
|
* power state upon success.
|
|
*/
|
|
int pwrdm_read_prev_logic_pwrst(struct powerdomain *pwrdm)
|
|
{
|
|
if (!pwrdm)
|
|
return -EINVAL;
|
|
|
|
/*
|
|
* The register bit names below may not correspond to the
|
|
* actual names of the bits in each powerdomain's register,
|
|
* but the type of value returned is the same for each
|
|
* powerdomain.
|
|
*/
|
|
return prm_read_mod_bits_shift(pwrdm->prcm_offs, OMAP3430_PM_PREPWSTST,
|
|
OMAP3430_LASTLOGICSTATEENTERED);
|
|
}
|
|
|
|
/**
|
|
* pwrdm_read_mem_pwrst - get current memory bank power state
|
|
* @pwrdm: struct powerdomain * to get current memory bank power state
|
|
* @bank: memory bank number (0-3)
|
|
*
|
|
* Return the powerdomain pwrdm's current memory power state for bank
|
|
* x. Returns -EINVAL if the powerdomain pointer is null, -EEXIST if
|
|
* the target memory bank does not exist or is not controllable, or
|
|
* returns the current memory power state upon success.
|
|
*/
|
|
int pwrdm_read_mem_pwrst(struct powerdomain *pwrdm, u8 bank)
|
|
{
|
|
u32 m;
|
|
|
|
if (!pwrdm)
|
|
return -EINVAL;
|
|
|
|
if (pwrdm->banks < (bank + 1))
|
|
return -EEXIST;
|
|
|
|
/*
|
|
* The register bit names below may not correspond to the
|
|
* actual names of the bits in each powerdomain's register,
|
|
* but the type of value returned is the same for each
|
|
* powerdomain.
|
|
*/
|
|
switch (bank) {
|
|
case 0:
|
|
m = OMAP3430_SHAREDL1CACHEFLATSTATEST_MASK;
|
|
break;
|
|
case 1:
|
|
m = OMAP3430_L1FLATMEMSTATEST_MASK;
|
|
break;
|
|
case 2:
|
|
m = OMAP3430_SHAREDL2CACHEFLATSTATEST_MASK;
|
|
break;
|
|
case 3:
|
|
m = OMAP3430_L2FLATMEMSTATEST_MASK;
|
|
break;
|
|
default:
|
|
WARN_ON(1); /* should never happen */
|
|
return -EEXIST;
|
|
}
|
|
|
|
return prm_read_mod_bits_shift(pwrdm->prcm_offs, PM_PWSTST, m);
|
|
}
|
|
|
|
/**
|
|
* pwrdm_read_prev_mem_pwrst - get previous memory bank power state
|
|
* @pwrdm: struct powerdomain * to get previous memory bank power state
|
|
* @bank: memory bank number (0-3)
|
|
*
|
|
* Return the powerdomain pwrdm's previous memory power state for bank
|
|
* x. Returns -EINVAL if the powerdomain pointer is null, -EEXIST if
|
|
* the target memory bank does not exist or is not controllable, or
|
|
* returns the previous memory power state upon success.
|
|
*/
|
|
int pwrdm_read_prev_mem_pwrst(struct powerdomain *pwrdm, u8 bank)
|
|
{
|
|
u32 m;
|
|
|
|
if (!pwrdm)
|
|
return -EINVAL;
|
|
|
|
if (pwrdm->banks < (bank + 1))
|
|
return -EEXIST;
|
|
|
|
/*
|
|
* The register bit names below may not correspond to the
|
|
* actual names of the bits in each powerdomain's register,
|
|
* but the type of value returned is the same for each
|
|
* powerdomain.
|
|
*/
|
|
switch (bank) {
|
|
case 0:
|
|
m = OMAP3430_LASTMEM1STATEENTERED_MASK;
|
|
break;
|
|
case 1:
|
|
m = OMAP3430_LASTMEM2STATEENTERED_MASK;
|
|
break;
|
|
case 2:
|
|
m = OMAP3430_LASTSHAREDL2CACHEFLATSTATEENTERED_MASK;
|
|
break;
|
|
case 3:
|
|
m = OMAP3430_LASTL2FLATMEMSTATEENTERED_MASK;
|
|
break;
|
|
default:
|
|
WARN_ON(1); /* should never happen */
|
|
return -EEXIST;
|
|
}
|
|
|
|
return prm_read_mod_bits_shift(pwrdm->prcm_offs,
|
|
OMAP3430_PM_PREPWSTST, m);
|
|
}
|
|
|
|
/**
|
|
* pwrdm_clear_all_prev_pwrst - clear previous powerstate register for a pwrdm
|
|
* @pwrdm: struct powerdomain * to clear
|
|
*
|
|
* Clear the powerdomain's previous power state register. Clears the
|
|
* entire register, including logic and memory bank previous power states.
|
|
* Returns -EINVAL if the powerdomain pointer is null, or returns 0 upon
|
|
* success.
|
|
*/
|
|
int pwrdm_clear_all_prev_pwrst(struct powerdomain *pwrdm)
|
|
{
|
|
if (!pwrdm)
|
|
return -EINVAL;
|
|
|
|
/*
|
|
* XXX should get the powerdomain's current state here;
|
|
* warn & fail if it is not ON.
|
|
*/
|
|
|
|
pr_debug("powerdomain: clearing previous power state reg for %s\n",
|
|
pwrdm->name);
|
|
|
|
prm_write_mod_reg(0, pwrdm->prcm_offs, OMAP3430_PM_PREPWSTST);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* pwrdm_enable_hdwr_sar - enable automatic hardware SAR for a pwrdm
|
|
* @pwrdm: struct powerdomain *
|
|
*
|
|
* Enable automatic context save-and-restore upon power state change
|
|
* for some devices in a powerdomain. Warning: this only affects a
|
|
* subset of devices in a powerdomain; check the TRM closely. Returns
|
|
* -EINVAL if the powerdomain pointer is null or if the powerdomain
|
|
* does not support automatic save-and-restore, or returns 0 upon
|
|
* success.
|
|
*/
|
|
int pwrdm_enable_hdwr_sar(struct powerdomain *pwrdm)
|
|
{
|
|
if (!pwrdm)
|
|
return -EINVAL;
|
|
|
|
if (!(pwrdm->flags & PWRDM_HAS_HDWR_SAR))
|
|
return -EINVAL;
|
|
|
|
pr_debug("powerdomain: %s: setting SAVEANDRESTORE bit\n",
|
|
pwrdm->name);
|
|
|
|
prm_rmw_mod_reg_bits(0, 1 << OMAP3430ES2_SAVEANDRESTORE_SHIFT,
|
|
pwrdm->prcm_offs, PM_PWSTCTRL);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* pwrdm_disable_hdwr_sar - disable automatic hardware SAR for a pwrdm
|
|
* @pwrdm: struct powerdomain *
|
|
*
|
|
* Disable automatic context save-and-restore upon power state change
|
|
* for some devices in a powerdomain. Warning: this only affects a
|
|
* subset of devices in a powerdomain; check the TRM closely. Returns
|
|
* -EINVAL if the powerdomain pointer is null or if the powerdomain
|
|
* does not support automatic save-and-restore, or returns 0 upon
|
|
* success.
|
|
*/
|
|
int pwrdm_disable_hdwr_sar(struct powerdomain *pwrdm)
|
|
{
|
|
if (!pwrdm)
|
|
return -EINVAL;
|
|
|
|
if (!(pwrdm->flags & PWRDM_HAS_HDWR_SAR))
|
|
return -EINVAL;
|
|
|
|
pr_debug("powerdomain: %s: clearing SAVEANDRESTORE bit\n",
|
|
pwrdm->name);
|
|
|
|
prm_rmw_mod_reg_bits(1 << OMAP3430ES2_SAVEANDRESTORE_SHIFT, 0,
|
|
pwrdm->prcm_offs, PM_PWSTCTRL);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* pwrdm_has_hdwr_sar - test whether powerdomain supports hardware SAR
|
|
* @pwrdm: struct powerdomain *
|
|
*
|
|
* Returns 1 if powerdomain 'pwrdm' supports hardware save-and-restore
|
|
* for some devices, or 0 if it does not.
|
|
*/
|
|
bool pwrdm_has_hdwr_sar(struct powerdomain *pwrdm)
|
|
{
|
|
return (pwrdm && pwrdm->flags & PWRDM_HAS_HDWR_SAR) ? 1 : 0;
|
|
}
|
|
|
|
/**
|
|
* pwrdm_wait_transition - wait for powerdomain power transition to finish
|
|
* @pwrdm: struct powerdomain * to wait for
|
|
*
|
|
* If the powerdomain pwrdm is in the process of a state transition,
|
|
* spin until it completes the power transition, or until an iteration
|
|
* bailout value is reached. Returns -EINVAL if the powerdomain
|
|
* pointer is null, -EAGAIN if the bailout value was reached, or
|
|
* returns 0 upon success.
|
|
*/
|
|
int pwrdm_wait_transition(struct powerdomain *pwrdm)
|
|
{
|
|
u32 c = 0;
|
|
|
|
if (!pwrdm)
|
|
return -EINVAL;
|
|
|
|
/*
|
|
* REVISIT: pwrdm_wait_transition() may be better implemented
|
|
* via a callback and a periodic timer check -- how long do we expect
|
|
* powerdomain transitions to take?
|
|
*/
|
|
|
|
/* XXX Is this udelay() value meaningful? */
|
|
while ((prm_read_mod_reg(pwrdm->prcm_offs, PM_PWSTST) &
|
|
OMAP_INTRANSITION) &&
|
|
(c++ < PWRDM_TRANSITION_BAILOUT))
|
|
udelay(1);
|
|
|
|
if (c > PWRDM_TRANSITION_BAILOUT) {
|
|
printk(KERN_ERR "powerdomain: waited too long for "
|
|
"powerdomain %s to complete transition\n", pwrdm->name);
|
|
return -EAGAIN;
|
|
}
|
|
|
|
pr_debug("powerdomain: completed transition in %d loops\n", c);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int pwrdm_state_switch(struct powerdomain *pwrdm)
|
|
{
|
|
return _pwrdm_state_switch(pwrdm, PWRDM_STATE_NOW);
|
|
}
|
|
|
|
int pwrdm_clkdm_state_switch(struct clockdomain *clkdm)
|
|
{
|
|
if (clkdm != NULL && clkdm->pwrdm.ptr != NULL) {
|
|
pwrdm_wait_transition(clkdm->pwrdm.ptr);
|
|
return pwrdm_state_switch(clkdm->pwrdm.ptr);
|
|
}
|
|
|
|
return -EINVAL;
|
|
}
|
|
int pwrdm_clk_state_switch(struct clk *clk)
|
|
{
|
|
if (clk != NULL && clk->clkdm != NULL)
|
|
return pwrdm_clkdm_state_switch(clk->clkdm);
|
|
return -EINVAL;
|
|
}
|
|
|
|
int pwrdm_pre_transition(void)
|
|
{
|
|
pwrdm_for_each(_pwrdm_pre_transition_cb, NULL);
|
|
return 0;
|
|
}
|
|
|
|
int pwrdm_post_transition(void)
|
|
{
|
|
pwrdm_for_each(_pwrdm_post_transition_cb, NULL);
|
|
return 0;
|
|
}
|
|
|