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7f595674e0
Add new powerdomain API u32 pwrdm_get_context_loss_count(struct powerdomain *pwrdm) for checking how many times the powerdomain has lost context. The loss count is the sum of the powerdomain off-mode counter, the logic off counter and the per-bank memory off counter. Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com> [paul@pwsan.com: removed bogus return value on error; improved kerneldoc; tweaked commit message] Signed-off-by: Paul Walmsley <paul@pwsan.com>
941 lines
24 KiB
C
941 lines
24 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) 2007-2009 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 "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 <plat/cpu.h>
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#include "powerdomain.h"
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#include "clockdomain.h"
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#include <plat/prcm.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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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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if (!pwrdm || !pwrdm->name)
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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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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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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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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;
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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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if (prev == PWRDM_POWER_RET)
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_update_logic_membank_counters(pwrdm);
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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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/* Public functions */
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/**
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* pwrdm_init - set up the powerdomain layer
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* @pwrdm_list: array of struct powerdomain pointers to register
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* @custom_funcs: func pointers for arch specfic implementations
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*
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* Loop through the array of powerdomains @pwrdm_list, registering all
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* that are available on the current CPU. If pwrdm_list is supplied
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* and not null, all of the referenced powerdomains will be
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* registered. No return value. XXX pwrdm_list is not really a
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* "list"; it is an array. Rename appropriately.
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*/
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void pwrdm_init(struct powerdomain **pwrdm_list, struct pwrdm_ops *custom_funcs)
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{
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struct powerdomain **p = NULL;
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if (!custom_funcs)
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WARN(1, "powerdomain: No custom pwrdm functions registered\n");
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else
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arch_pwrdm = custom_funcs;
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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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}
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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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* 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: associating clockdomain %s with powerdomain "
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"%s\n", clkdm->name, pwrdm->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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}
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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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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; -ENOENT
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* if @clkdm was not associated with the powerdomain, or 0 upon
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* 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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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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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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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 @fn 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. Returns -EINVAL if presented with
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* invalid pointers; or passes along 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.
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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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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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for (i = 0; i < PWRDM_MAX_CLKDMS && !ret; i++)
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ret = (*fn)(pwrdm, pwrdm->pwrdm_clkdms[i]);
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return ret;
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}
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/**
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* pwrdm_get_mem_bank_count - get number of memory banks in this powerdomain
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* @pwrdm: struct powerdomain *
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*
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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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*/
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int pwrdm_get_mem_bank_count(struct powerdomain *pwrdm)
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{
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if (!pwrdm)
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return -EINVAL;
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return pwrdm->banks;
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}
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/**
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* pwrdm_set_next_pwrst - set next powerdomain power state
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* @pwrdm: struct powerdomain * to set
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* @pwrst: one of the PWRDM_POWER_* macros
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*
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* Set the powerdomain @pwrdm's next power state to @pwrst. The powerdomain
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* may not enter this state immediately if the preconditions for this state
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* have not been satisfied. Returns -EINVAL if the powerdomain pointer is
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* null or if the power state is invalid for the powerdomin, or returns 0
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* upon success.
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*/
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int pwrdm_set_next_pwrst(struct powerdomain *pwrdm, u8 pwrst)
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{
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int ret = -EINVAL;
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if (!pwrdm)
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return -EINVAL;
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if (!(pwrdm->pwrsts & (1 << pwrst)))
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return -EINVAL;
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pr_debug("powerdomain: setting next powerstate for %s to %0x\n",
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pwrdm->name, pwrst);
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if (arch_pwrdm && arch_pwrdm->pwrdm_set_next_pwrst)
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ret = arch_pwrdm->pwrdm_set_next_pwrst(pwrdm, pwrst);
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return ret;
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}
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/**
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* pwrdm_read_next_pwrst - get next powerdomain power state
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* @pwrdm: struct powerdomain * to get power state
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*
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* Return the powerdomain @pwrdm's next power state. Returns -EINVAL
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* if the powerdomain pointer is null or returns the next power state
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* upon success.
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*/
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int pwrdm_read_next_pwrst(struct powerdomain *pwrdm)
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{
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int ret = -EINVAL;
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if (!pwrdm)
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return -EINVAL;
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if (arch_pwrdm && arch_pwrdm->pwrdm_read_next_pwrst)
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ret = arch_pwrdm->pwrdm_read_next_pwrst(pwrdm);
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return ret;
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}
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/**
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* pwrdm_read_pwrst - get current powerdomain power state
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* @pwrdm: struct powerdomain * to get power state
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*
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* Return the powerdomain @pwrdm's current power state. Returns -EINVAL
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* if the powerdomain pointer is null or returns the current power state
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* upon success.
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*/
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int pwrdm_read_pwrst(struct powerdomain *pwrdm)
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{
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int ret = -EINVAL;
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if (!pwrdm)
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return -EINVAL;
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if (arch_pwrdm && arch_pwrdm->pwrdm_read_pwrst)
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ret = arch_pwrdm->pwrdm_read_pwrst(pwrdm);
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return ret;
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}
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/**
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* pwrdm_read_prev_pwrst - get previous powerdomain power state
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* @pwrdm: struct powerdomain * to get previous power state
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*
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* Return the powerdomain @pwrdm's previous power state. Returns -EINVAL
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* if the powerdomain pointer is null or returns the previous power state
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* upon success.
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*/
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int pwrdm_read_prev_pwrst(struct powerdomain *pwrdm)
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{
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int ret = -EINVAL;
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if (!pwrdm)
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return -EINVAL;
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if (arch_pwrdm && arch_pwrdm->pwrdm_read_prev_pwrst)
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ret = arch_pwrdm->pwrdm_read_prev_pwrst(pwrdm);
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return ret;
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}
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/**
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* pwrdm_set_logic_retst - set powerdomain logic power state upon retention
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* @pwrdm: struct powerdomain * to set
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* @pwrst: one of the PWRDM_POWER_* macros
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*
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* Set the next power state @pwrst that the logic portion of the
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* powerdomain @pwrdm will enter when the powerdomain enters retention.
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* This will be either RETENTION or OFF, if supported. Returns
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* -EINVAL if the powerdomain pointer is null or the target power
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* state is not not supported, or returns 0 upon success.
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*/
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int pwrdm_set_logic_retst(struct powerdomain *pwrdm, u8 pwrst)
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{
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int ret = -EINVAL;
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if (!pwrdm)
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return -EINVAL;
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if (!(pwrdm->pwrsts_logic_ret & (1 << pwrst)))
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return -EINVAL;
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pr_debug("powerdomain: setting next logic powerstate for %s to %0x\n",
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pwrdm->name, pwrst);
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if (arch_pwrdm && arch_pwrdm->pwrdm_set_logic_retst)
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ret = arch_pwrdm->pwrdm_set_logic_retst(pwrdm, pwrst);
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return ret;
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}
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/**
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* pwrdm_set_mem_onst - set memory power state while powerdomain ON
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|
* @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: setting next memory powerstate for domain %s "
|
|
"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: setting next memory powerstate for domain %s "
|
|
"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: clearing previous power state reg for %s\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;
|
|
}
|
|
|
|
/**
|
|
* pwrdm_set_lowpwrstchange - Request a low power state change
|
|
* @pwrdm: struct powerdomain *
|
|
*
|
|
* Allows a powerdomain to transtion to a lower power sleep state
|
|
* from an existing sleep state without waking up the powerdomain.
|
|
* Returns -EINVAL if the powerdomain pointer is null or if the
|
|
* powerdomain does not support LOWPOWERSTATECHANGE, or returns 0
|
|
* upon success.
|
|
*/
|
|
int pwrdm_set_lowpwrstchange(struct powerdomain *pwrdm)
|
|
{
|
|
int ret = -EINVAL;
|
|
|
|
if (!pwrdm)
|
|
return -EINVAL;
|
|
|
|
if (!(pwrdm->flags & PWRDM_HAS_LOWPOWERSTATECHANGE))
|
|
return -EINVAL;
|
|
|
|
pr_debug("powerdomain: %s: setting LOWPOWERSTATECHANGE bit\n",
|
|
pwrdm->name);
|
|
|
|
if (arch_pwrdm && arch_pwrdm->pwrdm_set_lowpwrstchange)
|
|
ret = arch_pwrdm->pwrdm_set_lowpwrstchange(pwrdm);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* 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)
|
|
{
|
|
int ret = -EINVAL;
|
|
|
|
if (!pwrdm)
|
|
return -EINVAL;
|
|
|
|
if (arch_pwrdm && arch_pwrdm->pwrdm_wait_transition)
|
|
ret = arch_pwrdm->pwrdm_wait_transition(pwrdm);
|
|
|
|
return ret;
|
|
}
|
|
|
|
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_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;
|
|
}
|
|
|
|
/**
|
|
* 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 0
|
|
* (and WARNs) upon error, otherwise, returns the context loss count.
|
|
*/
|
|
u32 pwrdm_get_context_loss_count(struct powerdomain *pwrdm)
|
|
{
|
|
int i, count;
|
|
|
|
if (!pwrdm) {
|
|
WARN(1, "powerdomain: %s: pwrdm is null\n", __func__);
|
|
return 0;
|
|
}
|
|
|
|
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];
|
|
|
|
pr_debug("powerdomain: %s: context loss count = %u\n",
|
|
pwrdm->name, count);
|
|
|
|
return count;
|
|
}
|