1202 lines
32 KiB
C
1202 lines
32 KiB
C
/*
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* OMAP powerdomain control
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*
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* Copyright (C) 2007-2008, 2011 Texas Instruments, Inc.
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* Copyright (C) 2007-2011 Nokia Corporation
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*
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* Written by Paul Walmsley
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* Added OMAP4 specific support by Abhijit Pagare <abhijitpagare@ti.com>
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* State counting code by Tero Kristo <tero.kristo@nokia.com>
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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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#undef DEBUG
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#include <linux/kernel.h>
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#include <linux/types.h>
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#include <linux/list.h>
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#include <linux/errno.h>
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#include <linux/string.h>
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#include <linux/spinlock.h>
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#include <trace/events/power.h>
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#include "cm2xxx_3xxx.h"
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#include "prcm44xx.h"
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#include "cm44xx.h"
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#include "prm2xxx_3xxx.h"
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#include "prm44xx.h"
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#include <asm/cpu.h>
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#include "powerdomain.h"
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#include "clockdomain.h"
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#include "voltage.h"
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#include "soc.h"
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#include "pm.h"
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#define PWRDM_TRACE_STATES_FLAG (1<<31)
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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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/*
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* Types of sleep_switch used internally in omap_set_pwrdm_state()
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* and its associated static functions
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*
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* XXX Better documentation is needed here
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*/
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#define ALREADYACTIVE_SWITCH 0
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#define FORCEWAKEUP_SWITCH 1
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#define LOWPOWERSTATE_SWITCH 2
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/* pwrdm_list contains all registered struct powerdomains */
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static LIST_HEAD(pwrdm_list);
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static struct pwrdm_ops *arch_pwrdm;
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/* Private functions */
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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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/**
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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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static int _pwrdm_register(struct powerdomain *pwrdm)
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{
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int i;
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struct voltagedomain *voltdm;
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if (!pwrdm || !pwrdm->name)
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return -EINVAL;
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if (cpu_is_omap44xx() &&
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pwrdm->prcm_partition == OMAP4430_INVALID_PRCM_PARTITION) {
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pr_err("powerdomain: %s: missing OMAP4 PRCM partition ID\n",
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pwrdm->name);
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return -EINVAL;
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}
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if (_pwrdm_lookup(pwrdm->name))
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return -EEXIST;
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if (arch_pwrdm && arch_pwrdm->pwrdm_has_voltdm)
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if (!arch_pwrdm->pwrdm_has_voltdm())
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goto skip_voltdm;
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voltdm = voltdm_lookup(pwrdm->voltdm.name);
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if (!voltdm) {
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pr_err("powerdomain: %s: voltagedomain %s does not exist\n",
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pwrdm->name, pwrdm->voltdm.name);
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return -EINVAL;
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}
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pwrdm->voltdm.ptr = voltdm;
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INIT_LIST_HEAD(&pwrdm->voltdm_node);
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skip_voltdm:
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spin_lock_init(&pwrdm->_lock);
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list_add(&pwrdm->node, &pwrdm_list);
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/* Initialize the powerdomain's state counter */
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for (i = 0; i < PWRDM_MAX_PWRSTS; i++)
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pwrdm->state_counter[i] = 0;
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pwrdm->ret_logic_off_counter = 0;
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for (i = 0; i < pwrdm->banks; i++)
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pwrdm->ret_mem_off_counter[i] = 0;
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if (arch_pwrdm && arch_pwrdm->pwrdm_wait_transition)
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arch_pwrdm->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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pr_debug("powerdomain: registered %s\n", pwrdm->name);
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return 0;
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}
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static void _update_logic_membank_counters(struct powerdomain *pwrdm)
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{
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int i;
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u8 prev_logic_pwrst, prev_mem_pwrst;
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prev_logic_pwrst = pwrdm_read_prev_logic_pwrst(pwrdm);
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if ((pwrdm->pwrsts_logic_ret == PWRSTS_OFF_RET) &&
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(prev_logic_pwrst == PWRDM_POWER_OFF))
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pwrdm->ret_logic_off_counter++;
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for (i = 0; i < pwrdm->banks; i++) {
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prev_mem_pwrst = pwrdm_read_prev_mem_pwrst(pwrdm, i);
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if ((pwrdm->pwrsts_mem_ret[i] == PWRSTS_OFF_RET) &&
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(prev_mem_pwrst == PWRDM_POWER_OFF))
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pwrdm->ret_mem_off_counter[i]++;
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}
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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, next, state, trace_state = 0;
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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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if (prev == PWRDM_POWER_RET)
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_update_logic_membank_counters(pwrdm);
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/*
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* If the power domain did not hit the desired state,
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* generate a trace event with both the desired and hit states
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*/
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next = pwrdm_read_next_pwrst(pwrdm);
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if (next != prev) {
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trace_state = (PWRDM_TRACE_STATES_FLAG |
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((next & OMAP_POWERSTATE_MASK) << 8) |
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((prev & OMAP_POWERSTATE_MASK) << 0));
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trace_power_domain_target_rcuidle(pwrdm->name,
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trace_state,
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smp_processor_id());
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}
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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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/**
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* _pwrdm_save_clkdm_state_and_activate - prepare for power state change
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* @pwrdm: struct powerdomain * to operate on
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* @curr_pwrst: current power state of @pwrdm
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* @pwrst: power state to switch to
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*
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* Determine whether the powerdomain needs to be turned on before
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* attempting to switch power states. Called by
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* omap_set_pwrdm_state(). NOTE that if the powerdomain contains
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* multiple clockdomains, this code assumes that the first clockdomain
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* supports software-supervised wakeup mode - potentially a problem.
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* Returns the power state switch mode currently in use (see the
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* "Types of sleep_switch" comment above).
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*/
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static u8 _pwrdm_save_clkdm_state_and_activate(struct powerdomain *pwrdm,
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u8 curr_pwrst, u8 pwrst)
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{
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u8 sleep_switch;
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if (curr_pwrst < PWRDM_POWER_ON) {
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if (curr_pwrst > pwrst &&
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pwrdm->flags & PWRDM_HAS_LOWPOWERSTATECHANGE &&
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arch_pwrdm->pwrdm_set_lowpwrstchange) {
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sleep_switch = LOWPOWERSTATE_SWITCH;
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} else {
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clkdm_deny_idle_nolock(pwrdm->pwrdm_clkdms[0]);
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sleep_switch = FORCEWAKEUP_SWITCH;
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}
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} else {
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sleep_switch = ALREADYACTIVE_SWITCH;
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}
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return sleep_switch;
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}
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/**
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* _pwrdm_restore_clkdm_state - restore the clkdm hwsup state after pwrst change
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* @pwrdm: struct powerdomain * to operate on
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* @sleep_switch: return value from _pwrdm_save_clkdm_state_and_activate()
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*
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* Restore the clockdomain state perturbed by
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* _pwrdm_save_clkdm_state_and_activate(), and call the power state
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* bookkeeping code. Called by omap_set_pwrdm_state(). NOTE that if
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* the powerdomain contains multiple clockdomains, this assumes that
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* the first associated clockdomain supports either
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* hardware-supervised idle control in the register, or
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* software-supervised sleep. No return value.
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*/
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static void _pwrdm_restore_clkdm_state(struct powerdomain *pwrdm,
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u8 sleep_switch)
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{
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switch (sleep_switch) {
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case FORCEWAKEUP_SWITCH:
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clkdm_allow_idle_nolock(pwrdm->pwrdm_clkdms[0]);
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break;
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case LOWPOWERSTATE_SWITCH:
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if (pwrdm->flags & PWRDM_HAS_LOWPOWERSTATECHANGE &&
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arch_pwrdm->pwrdm_set_lowpwrstchange)
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arch_pwrdm->pwrdm_set_lowpwrstchange(pwrdm);
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pwrdm_state_switch_nolock(pwrdm);
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break;
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}
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}
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/* Public functions */
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/**
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* pwrdm_register_platform_funcs - register powerdomain implementation fns
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* @po: func pointers for arch specific implementations
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*
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* Register the list of function pointers used to implement the
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* powerdomain functions on different OMAP SoCs. Should be called
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* before any other pwrdm_register*() function. Returns -EINVAL if
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* @po is null, -EEXIST if platform functions have already been
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* registered, or 0 upon success.
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*/
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int pwrdm_register_platform_funcs(struct pwrdm_ops *po)
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{
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if (!po)
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return -EINVAL;
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if (arch_pwrdm)
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return -EEXIST;
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arch_pwrdm = po;
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return 0;
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}
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/**
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* pwrdm_register_pwrdms - register SoC powerdomains
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* @ps: pointer to an array of struct powerdomain to register
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*
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* Register the powerdomains available on a particular OMAP SoC. Must
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* be called after pwrdm_register_platform_funcs(). May be called
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* multiple times. Returns -EACCES if called before
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* pwrdm_register_platform_funcs(); -EINVAL if the argument @ps is
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* null; or 0 upon success.
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*/
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int pwrdm_register_pwrdms(struct powerdomain **ps)
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{
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struct powerdomain **p = NULL;
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if (!arch_pwrdm)
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return -EEXIST;
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if (!ps)
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return -EINVAL;
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for (p = ps; *p; p++)
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_pwrdm_register(*p);
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return 0;
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}
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/**
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* pwrdm_complete_init - set up the powerdomain layer
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*
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* Do whatever is necessary to initialize registered powerdomains and
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* powerdomain code. Currently, this programs the next power state
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* for each powerdomain to ON. This prevents powerdomains from
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* unexpectedly losing context or entering high wakeup latency modes
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* with non-power-management-enabled kernels. Must be called after
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* pwrdm_register_pwrdms(). Returns -EACCES if called before
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* pwrdm_register_pwrdms(), or 0 upon success.
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*/
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int pwrdm_complete_init(void)
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{
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struct powerdomain *temp_p;
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if (list_empty(&pwrdm_list))
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return -EACCES;
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list_for_each_entry(temp_p, &pwrdm_list, node)
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pwrdm_set_next_pwrst(temp_p, PWRDM_POWER_ON);
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return 0;
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}
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/**
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* pwrdm_lock - acquire a Linux spinlock on a powerdomain
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* @pwrdm: struct powerdomain * to lock
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*
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* Acquire the powerdomain spinlock on @pwrdm. No return value.
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*/
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void pwrdm_lock(struct powerdomain *pwrdm)
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__acquires(&pwrdm->_lock)
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{
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spin_lock_irqsave(&pwrdm->_lock, pwrdm->_lock_flags);
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}
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/**
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* pwrdm_unlock - release a Linux spinlock on a powerdomain
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* @pwrdm: struct powerdomain * to unlock
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*
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* Release the powerdomain spinlock on @pwrdm. No return value.
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*/
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void pwrdm_unlock(struct powerdomain *pwrdm)
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__releases(&pwrdm->_lock)
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{
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spin_unlock_irqrestore(&pwrdm->_lock, pwrdm->_lock_flags);
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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 @name. Returns a pointer
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* to the 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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if (!name)
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return NULL;
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pwrdm = _pwrdm_lookup(name);
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return pwrdm;
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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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* Call the supplied function @fn for each registered powerdomain.
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* The callback function @fn can return anything but 0 to bail out
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* early from the iterator. Returns the last return value of the
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* callback function, which should be 0 for success or anything else
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* to indicate failure; or -EINVAL if the function pointer is null.
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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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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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/**
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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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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: %s: associating clockdomain %s\n",
|
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pwrdm->name, clkdm->name);
|
|
|
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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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#endif
|
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}
|
|
|
|
if (i == PWRDM_MAX_CLKDMS) {
|
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pr_debug("powerdomain: %s: increase PWRDM_MAX_CLKDMS for clkdm %s\n",
|
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pwrdm->name, clkdm->name);
|
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WARN_ON(1);
|
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ret = -ENOMEM;
|
|
goto pac_exit;
|
|
}
|
|
|
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pwrdm->pwrdm_clkdms[i] = clkdm;
|
|
|
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ret = 0;
|
|
|
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pac_exit:
|
|
return ret;
|
|
}
|
|
|
|
/**
|
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* pwrdm_get_mem_bank_count - get number of memory banks in this powerdomain
|
|
* @pwrdm: struct powerdomain *
|
|
*
|
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* Return the number of controllable memory banks in powerdomain @pwrdm,
|
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* starting with 1. Returns -EINVAL if the powerdomain pointer is null.
|
|
*/
|
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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)
|
|
{
|
|
int ret = -EINVAL;
|
|
|
|
if (!pwrdm)
|
|
return -EINVAL;
|
|
|
|
if (!(pwrdm->pwrsts & (1 << pwrst)))
|
|
return -EINVAL;
|
|
|
|
pr_debug("powerdomain: %s: setting next powerstate to %0x\n",
|
|
pwrdm->name, pwrst);
|
|
|
|
if (arch_pwrdm && arch_pwrdm->pwrdm_set_next_pwrst) {
|
|
/* Trace the pwrdm desired target state */
|
|
trace_power_domain_target_rcuidle(pwrdm->name, pwrst,
|
|
smp_processor_id());
|
|
/* Program the pwrdm desired target state */
|
|
ret = arch_pwrdm->pwrdm_set_next_pwrst(pwrdm, pwrst);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* 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)
|
|
{
|
|
int ret = -EINVAL;
|
|
|
|
if (!pwrdm)
|
|
return -EINVAL;
|
|
|
|
if (arch_pwrdm && arch_pwrdm->pwrdm_read_next_pwrst)
|
|
ret = arch_pwrdm->pwrdm_read_next_pwrst(pwrdm);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* 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. Note that if the power domain only supports the ON state
|
|
* then just return ON as the current state.
|
|
*/
|
|
int pwrdm_read_pwrst(struct powerdomain *pwrdm)
|
|
{
|
|
int ret = -EINVAL;
|
|
|
|
if (!pwrdm)
|
|
return -EINVAL;
|
|
|
|
if (pwrdm->pwrsts == PWRSTS_ON)
|
|
return PWRDM_POWER_ON;
|
|
|
|
if (arch_pwrdm && arch_pwrdm->pwrdm_read_pwrst)
|
|
ret = arch_pwrdm->pwrdm_read_pwrst(pwrdm);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* 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)
|
|
{
|
|
int ret = -EINVAL;
|
|
|
|
if (!pwrdm)
|
|
return -EINVAL;
|
|
|
|
if (arch_pwrdm && arch_pwrdm->pwrdm_read_prev_pwrst)
|
|
ret = arch_pwrdm->pwrdm_read_prev_pwrst(pwrdm);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* 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 @pwrst 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)
|
|
{
|
|
int ret = -EINVAL;
|
|
|
|
if (!pwrdm)
|
|
return -EINVAL;
|
|
|
|
if (!(pwrdm->pwrsts_logic_ret & (1 << pwrst)))
|
|
return -EINVAL;
|
|
|
|
pr_debug("powerdomain: %s: setting next logic powerstate to %0x\n",
|
|
pwrdm->name, pwrst);
|
|
|
|
if (arch_pwrdm && arch_pwrdm->pwrdm_set_logic_retst)
|
|
ret = arch_pwrdm->pwrdm_set_logic_retst(pwrdm, pwrst);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* 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 @pwrst that memory bank @bank 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)
|
|
{
|
|
int ret = -EINVAL;
|
|
|
|
if (!pwrdm)
|
|
return -EINVAL;
|
|
|
|
if (pwrdm->banks < (bank + 1))
|
|
return -EEXIST;
|
|
|
|
if (!(pwrdm->pwrsts_mem_on[bank] & (1 << pwrst)))
|
|
return -EINVAL;
|
|
|
|
pr_debug("powerdomain: %s: setting next memory powerstate for bank %0x while pwrdm-ON to %0x\n",
|
|
pwrdm->name, bank, pwrst);
|
|
|
|
if (arch_pwrdm && arch_pwrdm->pwrdm_set_mem_onst)
|
|
ret = arch_pwrdm->pwrdm_set_mem_onst(pwrdm, bank, pwrst);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* 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 @pwrst that memory bank @bank 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)
|
|
{
|
|
int ret = -EINVAL;
|
|
|
|
if (!pwrdm)
|
|
return -EINVAL;
|
|
|
|
if (pwrdm->banks < (bank + 1))
|
|
return -EEXIST;
|
|
|
|
if (!(pwrdm->pwrsts_mem_ret[bank] & (1 << pwrst)))
|
|
return -EINVAL;
|
|
|
|
pr_debug("powerdomain: %s: setting next memory powerstate for bank %0x while pwrdm-RET to %0x\n",
|
|
pwrdm->name, bank, pwrst);
|
|
|
|
if (arch_pwrdm && arch_pwrdm->pwrdm_set_mem_retst)
|
|
ret = arch_pwrdm->pwrdm_set_mem_retst(pwrdm, bank, pwrst);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* pwrdm_read_logic_pwrst - get current powerdomain logic retention power state
|
|
* @pwrdm: struct powerdomain * to get current logic retention power state
|
|
*
|
|
* Return the power state that the logic portion of powerdomain @pwrdm
|
|
* will enter when the powerdomain enters retention. Returns -EINVAL
|
|
* if the powerdomain pointer is null or returns the logic retention
|
|
* power state upon success.
|
|
*/
|
|
int pwrdm_read_logic_pwrst(struct powerdomain *pwrdm)
|
|
{
|
|
int ret = -EINVAL;
|
|
|
|
if (!pwrdm)
|
|
return -EINVAL;
|
|
|
|
if (arch_pwrdm && arch_pwrdm->pwrdm_read_logic_pwrst)
|
|
ret = arch_pwrdm->pwrdm_read_logic_pwrst(pwrdm);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* 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 previous 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)
|
|
{
|
|
int ret = -EINVAL;
|
|
|
|
if (!pwrdm)
|
|
return -EINVAL;
|
|
|
|
if (arch_pwrdm && arch_pwrdm->pwrdm_read_prev_logic_pwrst)
|
|
ret = arch_pwrdm->pwrdm_read_prev_logic_pwrst(pwrdm);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* pwrdm_read_logic_retst - get next powerdomain logic power state
|
|
* @pwrdm: struct powerdomain * to get next logic power state
|
|
*
|
|
* Return the powerdomain pwrdm's logic power state. Returns -EINVAL
|
|
* if the powerdomain pointer is null or returns the next logic
|
|
* power state upon success.
|
|
*/
|
|
int pwrdm_read_logic_retst(struct powerdomain *pwrdm)
|
|
{
|
|
int ret = -EINVAL;
|
|
|
|
if (!pwrdm)
|
|
return -EINVAL;
|
|
|
|
if (arch_pwrdm && arch_pwrdm->pwrdm_read_logic_retst)
|
|
ret = arch_pwrdm->pwrdm_read_logic_retst(pwrdm);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* 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
|
|
* @bank. 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)
|
|
{
|
|
int ret = -EINVAL;
|
|
|
|
if (!pwrdm)
|
|
return ret;
|
|
|
|
if (pwrdm->banks < (bank + 1))
|
|
return ret;
|
|
|
|
if (pwrdm->flags & PWRDM_HAS_MPU_QUIRK)
|
|
bank = 1;
|
|
|
|
if (arch_pwrdm && arch_pwrdm->pwrdm_read_mem_pwrst)
|
|
ret = arch_pwrdm->pwrdm_read_mem_pwrst(pwrdm, bank);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* 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 @bank. 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)
|
|
{
|
|
int ret = -EINVAL;
|
|
|
|
if (!pwrdm)
|
|
return ret;
|
|
|
|
if (pwrdm->banks < (bank + 1))
|
|
return ret;
|
|
|
|
if (pwrdm->flags & PWRDM_HAS_MPU_QUIRK)
|
|
bank = 1;
|
|
|
|
if (arch_pwrdm && arch_pwrdm->pwrdm_read_prev_mem_pwrst)
|
|
ret = arch_pwrdm->pwrdm_read_prev_mem_pwrst(pwrdm, bank);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* pwrdm_read_mem_retst - get next memory bank power state
|
|
* @pwrdm: struct powerdomain * to get mext memory bank power state
|
|
* @bank: memory bank number (0-3)
|
|
*
|
|
* Return the powerdomain pwrdm's next 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 next memory power state upon success.
|
|
*/
|
|
int pwrdm_read_mem_retst(struct powerdomain *pwrdm, u8 bank)
|
|
{
|
|
int ret = -EINVAL;
|
|
|
|
if (!pwrdm)
|
|
return ret;
|
|
|
|
if (pwrdm->banks < (bank + 1))
|
|
return ret;
|
|
|
|
if (arch_pwrdm && arch_pwrdm->pwrdm_read_mem_retst)
|
|
ret = arch_pwrdm->pwrdm_read_mem_retst(pwrdm, bank);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* 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 @pwrdm.
|
|
* 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)
|
|
{
|
|
int ret = -EINVAL;
|
|
|
|
if (!pwrdm)
|
|
return ret;
|
|
|
|
/*
|
|
* XXX should get the powerdomain's current state here;
|
|
* warn & fail if it is not ON.
|
|
*/
|
|
|
|
pr_debug("powerdomain: %s: clearing previous power state reg\n",
|
|
pwrdm->name);
|
|
|
|
if (arch_pwrdm && arch_pwrdm->pwrdm_clear_all_prev_pwrst)
|
|
ret = arch_pwrdm->pwrdm_clear_all_prev_pwrst(pwrdm);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* 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 the powerdomain @pwrdm. 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)
|
|
{
|
|
int ret = -EINVAL;
|
|
|
|
if (!pwrdm)
|
|
return ret;
|
|
|
|
if (!(pwrdm->flags & PWRDM_HAS_HDWR_SAR))
|
|
return ret;
|
|
|
|
pr_debug("powerdomain: %s: setting SAVEANDRESTORE bit\n", pwrdm->name);
|
|
|
|
if (arch_pwrdm && arch_pwrdm->pwrdm_enable_hdwr_sar)
|
|
ret = arch_pwrdm->pwrdm_enable_hdwr_sar(pwrdm);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* 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 the powerdomain @pwrdm. 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)
|
|
{
|
|
int ret = -EINVAL;
|
|
|
|
if (!pwrdm)
|
|
return ret;
|
|
|
|
if (!(pwrdm->flags & PWRDM_HAS_HDWR_SAR))
|
|
return ret;
|
|
|
|
pr_debug("powerdomain: %s: clearing SAVEANDRESTORE bit\n", pwrdm->name);
|
|
|
|
if (arch_pwrdm && arch_pwrdm->pwrdm_disable_hdwr_sar)
|
|
ret = arch_pwrdm->pwrdm_disable_hdwr_sar(pwrdm);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* 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;
|
|
}
|
|
|
|
int pwrdm_state_switch_nolock(struct powerdomain *pwrdm)
|
|
{
|
|
int ret;
|
|
|
|
if (!pwrdm || !arch_pwrdm)
|
|
return -EINVAL;
|
|
|
|
ret = arch_pwrdm->pwrdm_wait_transition(pwrdm);
|
|
if (!ret)
|
|
ret = _pwrdm_state_switch(pwrdm, PWRDM_STATE_NOW);
|
|
|
|
return ret;
|
|
}
|
|
|
|
int __deprecated pwrdm_state_switch(struct powerdomain *pwrdm)
|
|
{
|
|
int ret;
|
|
|
|
pwrdm_lock(pwrdm);
|
|
ret = pwrdm_state_switch_nolock(pwrdm);
|
|
pwrdm_unlock(pwrdm);
|
|
|
|
return ret;
|
|
}
|
|
|
|
int pwrdm_pre_transition(struct powerdomain *pwrdm)
|
|
{
|
|
if (pwrdm)
|
|
_pwrdm_pre_transition_cb(pwrdm, NULL);
|
|
else
|
|
pwrdm_for_each(_pwrdm_pre_transition_cb, NULL);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int pwrdm_post_transition(struct powerdomain *pwrdm)
|
|
{
|
|
if (pwrdm)
|
|
_pwrdm_post_transition_cb(pwrdm, NULL);
|
|
else
|
|
pwrdm_for_each(_pwrdm_post_transition_cb, NULL);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* pwrdm_get_valid_lp_state() - Find best match deep power state
|
|
* @pwrdm: power domain for which we want to find best match
|
|
* @is_logic_state: Are we looking for logic state match here? Should
|
|
* be one of PWRDM_xxx macro values
|
|
* @req_state: requested power state
|
|
*
|
|
* Returns: closest match for requested power state. default fallback
|
|
* is RET for logic state and ON for power state.
|
|
*
|
|
* This does a search from the power domain data looking for the
|
|
* closest valid power domain state that the hardware can achieve.
|
|
* PRCM definitions for PWRSTCTRL allows us to program whatever
|
|
* configuration we'd like, and PRCM will actually attempt such
|
|
* a transition, however if the powerdomain does not actually support it,
|
|
* we endup with a hung system. The valid power domain states are already
|
|
* available in our powerdomain data files. So this function tries to do
|
|
* the following:
|
|
* a) find if we have an exact match to the request - no issues.
|
|
* b) else find if a deeper power state is possible.
|
|
* c) failing which, it tries to find closest higher power state for the
|
|
* request.
|
|
*/
|
|
u8 pwrdm_get_valid_lp_state(struct powerdomain *pwrdm,
|
|
bool is_logic_state, u8 req_state)
|
|
{
|
|
u8 pwrdm_states = is_logic_state ? pwrdm->pwrsts_logic_ret :
|
|
pwrdm->pwrsts;
|
|
/* For logic, ret is highest and others, ON is highest */
|
|
u8 default_pwrst = is_logic_state ? PWRDM_POWER_RET : PWRDM_POWER_ON;
|
|
u8 new_pwrst;
|
|
bool found;
|
|
|
|
/* If it is already supported, nothing to search */
|
|
if (pwrdm_states & BIT(req_state))
|
|
return req_state;
|
|
|
|
if (!req_state)
|
|
goto up_search;
|
|
|
|
/*
|
|
* So, we dont have a exact match
|
|
* Can we get a deeper power state match?
|
|
*/
|
|
new_pwrst = req_state - 1;
|
|
found = true;
|
|
while (!(pwrdm_states & BIT(new_pwrst))) {
|
|
/* No match even at OFF? Not available */
|
|
if (new_pwrst == PWRDM_POWER_OFF) {
|
|
found = false;
|
|
break;
|
|
}
|
|
new_pwrst--;
|
|
}
|
|
|
|
if (found)
|
|
goto done;
|
|
|
|
up_search:
|
|
/* OK, no deeper ones, can we get a higher match? */
|
|
new_pwrst = req_state + 1;
|
|
while (!(pwrdm_states & BIT(new_pwrst))) {
|
|
if (new_pwrst > PWRDM_POWER_ON) {
|
|
WARN(1, "powerdomain: %s: Fix max powerstate to ON\n",
|
|
pwrdm->name);
|
|
return PWRDM_POWER_ON;
|
|
}
|
|
|
|
if (new_pwrst == default_pwrst)
|
|
break;
|
|
new_pwrst++;
|
|
}
|
|
done:
|
|
return new_pwrst;
|
|
}
|
|
|
|
/**
|
|
* omap_set_pwrdm_state - change a powerdomain's current power state
|
|
* @pwrdm: struct powerdomain * to change the power state of
|
|
* @pwrst: power state to change to
|
|
*
|
|
* Change the current hardware power state of the powerdomain
|
|
* represented by @pwrdm to the power state represented by @pwrst.
|
|
* Returns -EINVAL if @pwrdm is null or invalid or if the
|
|
* powerdomain's current power state could not be read, or returns 0
|
|
* upon success or if @pwrdm does not support @pwrst or any
|
|
* lower-power state. XXX Should not return 0 if the @pwrdm does not
|
|
* support @pwrst or any lower-power state: this should be an error.
|
|
*/
|
|
int omap_set_pwrdm_state(struct powerdomain *pwrdm, u8 pwrst)
|
|
{
|
|
u8 next_pwrst, sleep_switch;
|
|
int curr_pwrst;
|
|
int ret = 0;
|
|
|
|
if (!pwrdm || IS_ERR(pwrdm))
|
|
return -EINVAL;
|
|
|
|
while (!(pwrdm->pwrsts & (1 << pwrst))) {
|
|
if (pwrst == PWRDM_POWER_OFF)
|
|
return ret;
|
|
pwrst--;
|
|
}
|
|
|
|
pwrdm_lock(pwrdm);
|
|
|
|
curr_pwrst = pwrdm_read_pwrst(pwrdm);
|
|
if (curr_pwrst < 0) {
|
|
ret = -EINVAL;
|
|
goto osps_out;
|
|
}
|
|
|
|
next_pwrst = pwrdm_read_next_pwrst(pwrdm);
|
|
if (curr_pwrst == pwrst && next_pwrst == pwrst)
|
|
goto osps_out;
|
|
|
|
sleep_switch = _pwrdm_save_clkdm_state_and_activate(pwrdm, curr_pwrst,
|
|
pwrst);
|
|
|
|
ret = pwrdm_set_next_pwrst(pwrdm, pwrst);
|
|
if (ret)
|
|
pr_err("%s: unable to set power state of powerdomain: %s\n",
|
|
__func__, pwrdm->name);
|
|
|
|
_pwrdm_restore_clkdm_state(pwrdm, sleep_switch);
|
|
|
|
osps_out:
|
|
pwrdm_unlock(pwrdm);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* pwrdm_get_context_loss_count - get powerdomain's context loss count
|
|
* @pwrdm: struct powerdomain * to wait for
|
|
*
|
|
* Context loss count is the sum of powerdomain off-mode counter, the
|
|
* logic off counter and the per-bank memory off counter. Returns negative
|
|
* (and WARNs) upon error, otherwise, returns the context loss count.
|
|
*/
|
|
int pwrdm_get_context_loss_count(struct powerdomain *pwrdm)
|
|
{
|
|
int i, count;
|
|
|
|
if (!pwrdm) {
|
|
WARN(1, "powerdomain: %s: pwrdm is null\n", __func__);
|
|
return -ENODEV;
|
|
}
|
|
|
|
count = pwrdm->state_counter[PWRDM_POWER_OFF];
|
|
count += pwrdm->ret_logic_off_counter;
|
|
|
|
for (i = 0; i < pwrdm->banks; i++)
|
|
count += pwrdm->ret_mem_off_counter[i];
|
|
|
|
/*
|
|
* Context loss count has to be a non-negative value. Clear the sign
|
|
* bit to get a value range from 0 to INT_MAX.
|
|
*/
|
|
count &= INT_MAX;
|
|
|
|
pr_debug("powerdomain: %s: context loss count = %d\n",
|
|
pwrdm->name, count);
|
|
|
|
return count;
|
|
}
|
|
|
|
/**
|
|
* pwrdm_can_ever_lose_context - can this powerdomain ever lose context?
|
|
* @pwrdm: struct powerdomain *
|
|
*
|
|
* Given a struct powerdomain * @pwrdm, returns 1 if the powerdomain
|
|
* can lose either memory or logic context or if @pwrdm is invalid, or
|
|
* returns 0 otherwise. This function is not concerned with how the
|
|
* powerdomain registers are programmed (i.e., to go off or not); it's
|
|
* concerned with whether it's ever possible for this powerdomain to
|
|
* go off while some other part of the chip is active. This function
|
|
* assumes that every powerdomain can go to either ON or INACTIVE.
|
|
*/
|
|
bool pwrdm_can_ever_lose_context(struct powerdomain *pwrdm)
|
|
{
|
|
int i;
|
|
|
|
if (!pwrdm) {
|
|
pr_debug("powerdomain: %s: invalid powerdomain pointer\n",
|
|
__func__);
|
|
return 1;
|
|
}
|
|
|
|
if (pwrdm->pwrsts & PWRSTS_OFF)
|
|
return 1;
|
|
|
|
if (pwrdm->pwrsts & PWRSTS_RET) {
|
|
if (pwrdm->pwrsts_logic_ret & PWRSTS_OFF)
|
|
return 1;
|
|
|
|
for (i = 0; i < pwrdm->banks; i++)
|
|
if (pwrdm->pwrsts_mem_ret[i] & PWRSTS_OFF)
|
|
return 1;
|
|
}
|
|
|
|
for (i = 0; i < pwrdm->banks; i++)
|
|
if (pwrdm->pwrsts_mem_on[i] & PWRSTS_OFF)
|
|
return 1;
|
|
|
|
return 0;
|
|
}
|