/*
* OMAP powerdomain control
*
* Copyright (C) 2007-2008 Texas Instruments, Inc.
* Copyright (C) 2007-2011 Nokia Corporation
*
* Written by Paul Walmsley
* Added OMAP4 specific support by Abhijit Pagare <abhijitpagare@ti.com>
* State counting code by Tero Kristo <tero.kristo@nokia.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#undef DEBUG
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/list.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <trace/events/power.h>
#include "cm2xxx_3xxx.h"
#include "prcm44xx.h"
#include "cm44xx.h"
#include "prm2xxx_3xxx.h"
#include "prm44xx.h"
#include <asm/cpu.h>
#include <plat/cpu.h>
#include "powerdomain.h"
#include "clockdomain.h"
#include <plat/prcm.h>
#include "pm.h"
#define PWRDM_TRACE_STATES_FLAG (1<<31)
enum {
PWRDM_STATE_NOW = 0,
PWRDM_STATE_PREV,
};
/* pwrdm_list contains all registered struct powerdomains */
static LIST_HEAD(pwrdm_list);
static struct pwrdm_ops *arch_pwrdm;
/* Private functions */
static struct powerdomain *_pwrdm_lookup(const char *name)
{
struct powerdomain *pwrdm, *temp_pwrdm;
pwrdm = NULL;
list_for_each_entry(temp_pwrdm, &pwrdm_list, node) {
if (!strcmp(name, temp_pwrdm->name)) {
pwrdm = temp_pwrdm;
break;
}
}
return pwrdm;
}
/**
* _pwrdm_register - register a powerdomain
* @pwrdm: struct powerdomain * to register
*
* Adds a powerdomain to the internal powerdomain list. Returns
* -EINVAL if given a null pointer, -EEXIST if a powerdomain is
* already registered by the provided name, or 0 upon success.
*/
static int _pwrdm_register(struct powerdomain *pwrdm)
{
int i;
if (!pwrdm || !pwrdm->name)
return -EINVAL;
if (!omap_chip_is(pwrdm->omap_chip))
return -EINVAL;
if (cpu_is_omap44xx() &&
pwrdm->prcm_partition == OMAP4430_INVALID_PRCM_PARTITION) {
pr_err("powerdomain: %s: missing OMAP4 PRCM partition ID\n",
pwrdm->name);
return -EINVAL;
}
if (_pwrdm_lookup(pwrdm->name))
return -EEXIST;
list_add(&pwrdm->node, &pwrdm_list);
/* Initialize the powerdomain's state counter */
for (i = 0; i < PWRDM_MAX_PWRSTS; i++)
pwrdm->state_counter[i] = 0;
pwrdm->ret_logic_off_counter = 0;
for (i = 0; i < pwrdm->banks; i++)
pwrdm->ret_mem_off_counter[i] = 0;
pwrdm_wait_transition(pwrdm);
pwrdm->state = pwrdm_read_pwrst(pwrdm);
pwrdm->state_counter[pwrdm->state] = 1;
pr_debug("powerdomain: registered %s\n", pwrdm->name);
return 0;
}
static void _update_logic_membank_counters(struct powerdomain *pwrdm)
{
int i;
u8 prev_logic_pwrst, prev_mem_pwrst;
prev_logic_pwrst = pwrdm_read_prev_logic_pwrst(pwrdm);
if ((pwrdm->pwrsts_logic_ret == PWRSTS_OFF_RET) &&
(prev_logic_pwrst == PWRDM_POWER_OFF))
pwrdm->ret_logic_off_counter++;
for (i = 0; i < pwrdm->banks; i++) {
prev_mem_pwrst = pwrdm_read_prev_mem_pwrst(pwrdm, i);
if ((pwrdm->pwrsts_mem_ret[i] == PWRSTS_OFF_RET) &&
(prev_mem_pwrst == PWRDM_POWER_OFF))
pwrdm->ret_mem_off_counter[i]++;
}
}
static int _pwrdm_state_switch(struct powerdomain *pwrdm, int flag)
{
int prev, state, trace_state = 0;
if (pwrdm == NULL)
return -EINVAL;
state = pwrdm_read_pwrst(pwrdm);
switch (flag) {
case PWRDM_STATE_NOW:
prev = pwrdm->state;
break;
case PWRDM_STATE_PREV:
prev = pwrdm_read_prev_pwrst(pwrdm);
if (pwrdm->state != prev)
pwrdm->state_counter[prev]++;
if (prev == PWRDM_POWER_RET)
_update_logic_membank_counters(pwrdm);
/*
* If the power domain did not hit the desired state,
* generate a trace event with both the desired and hit states
*/
if (state != prev) {
trace_state = (PWRDM_TRACE_STATES_FLAG |
((state & OMAP_POWERSTATE_MASK) << 8) |
((prev & OMAP_POWERSTATE_MASK) << 0));
trace_power_domain_target(pwrdm->name, trace_state,
smp_processor_id());
}
break;
default:
return -EINVAL;
}
if (state != prev)
pwrdm->state_counter[state]++;
pm_dbg_update_time(pwrdm, prev);
pwrdm->state = state;
return 0;
}
static int _pwrdm_pre_transition_cb(struct powerdomain *pwrdm, void *unused)
{
pwrdm_clear_all_prev_pwrst(pwrdm);
_pwrdm_state_switch(pwrdm, PWRDM_STATE_NOW);
return 0;
}
static int _pwrdm_post_transition_cb(struct powerdomain *pwrdm, void *unused)
{
_pwrdm_state_switch(pwrdm, PWRDM_STATE_PREV);
return 0;
}
/* Public functions */
/**
* pwrdm_init - set up the powerdomain layer
* @pwrdm_list: array of struct powerdomain pointers to register
* @custom_funcs: func pointers for arch specfic implementations
*
* Loop through the array of powerdomains @pwrdm_list, registering all
* that are available on the current CPU. If pwrdm_list is supplied
* and not null, all of the referenced powerdomains will be
* registered. No return value. XXX pwrdm_list is not really a
* "list"; it is an array. Rename appropriately.
*/
void pwrdm_init(struct powerdomain **pwrdm_list, struct pwrdm_ops *custom_funcs)
{
struct powerdomain **p = NULL;
if (!custom_funcs)
WARN(1, "powerdomain: No custom pwrdm functions registered\n");
else
arch_pwrdm = custom_funcs;
if (pwrdm_list) {
for (p = pwrdm_list; *p; p++)
_pwrdm_register(*p);
}
}
/**
* pwrdm_lookup - look up a powerdomain by name, return a pointer
* @name: name of powerdomain
*
* Find a registered powerdomain by its name @name. Returns a pointer
* to the struct powerdomain if found, or NULL otherwise.
*/
struct powerdomain *pwrdm_lookup(const char *name)
{
struct powerdomain *pwrdm;
if (!name)
return NULL;
pwrdm = _pwrdm_lookup(name);
return pwrdm;
}
/**
* pwrdm_for_each - call function on each registered clockdomain
* @fn: callback function *
*
* Call the supplied function @fn for each registered powerdomain.
* The callback function @fn can return anything but 0 to bail out
* early from the iterator. Returns the last return value of the
* callback function, which should be 0 for success or anything else
* to indicate failure; or -EINVAL if the function pointer is null.
*/
int pwrdm_for_each(int (*fn)(struct powerdomain *pwrdm, void *user),
void *user)
{
struct powerdomain *temp_pwrdm;
int ret = 0;
if (!fn)
return -EINVAL;
list_for_each_entry(temp_pwrdm, &pwrdm_list, node) {
ret = (*fn)(temp_pwrdm, user);
if (ret)
break;
}
return ret;
}
/**
* pwrdm_add_clkdm - add a clockdomain to a powerdomain
* @pwrdm: struct powerdomain * to add the clockdomain to
* @clkdm: struct clockdomain * to associate with a powerdomain
*
* Associate the clockdomain @clkdm with a powerdomain @pwrdm. This
* enables the use of pwrdm_for_each_clkdm(). Returns -EINVAL if
* presented with invalid pointers; -ENOMEM if memory could not be allocated;
* or 0 upon success.
*/
int pwrdm_add_clkdm(struct powerdomain *pwrdm, struct clockdomain *clkdm)
{
int i;
int ret = -EINVAL;
if (!pwrdm || !clkdm)
return -EINVAL;
pr_debug("powerdomain: associating clockdomain %s with powerdomain "
"%s\n", clkdm->name, pwrdm->name);
for (i = 0; i < PWRDM_MAX_CLKDMS; i++) {
if (!pwrdm->pwrdm_clkdms[i])
break;
#ifdef DEBUG
if (pwrdm->pwrdm_clkdms[i] == clkdm) {
ret = -EINVAL;
goto pac_exit;
}
#endif
}
if (i == PWRDM_MAX_CLKDMS) {
pr_debug("powerdomain: increase PWRDM_MAX_CLKDMS for "
"pwrdm %s clkdm %s\n", pwrdm->name, clkdm->name);
WARN_ON(1);
ret = -ENOMEM;
goto pac_exit;
}
pwrdm->pwrdm_clkdms[i] = clkdm;
ret = 0;
pac_exit:
return ret;
}
/**
* pwrdm_del_clkdm - remove a clockdomain from a powerdomain
* @pwrdm: struct powerdomain * to add the clockdomain to
* @clkdm: struct clockdomain * to associate with a powerdomain
*
* Dissociate the clockdomain @clkdm from the powerdomain
* @pwrdm. Returns -EINVAL if presented with invalid pointers; -ENOENT
* if @clkdm was not associated with the powerdomain, or 0 upon
* success.
*/
int pwrdm_del_clkdm(struct powerdomain *pwrdm, struct clockdomain *clkdm)
{
int ret = -EINVAL;
int i;
if (!pwrdm || !clkdm)
return -EINVAL;
pr_debug("powerdomain: dissociating clockdomain %s from powerdomain "
"%s\n", clkdm->name, pwrdm->name);
for (i = 0; i < PWRDM_MAX_CLKDMS; i++)
if (pwrdm->pwrdm_clkdms[i] == clkdm)
break;
if (i == PWRDM_MAX_CLKDMS) {
pr_debug("powerdomain: clkdm %s not associated with pwrdm "
"%s ?!\n", clkdm->name, pwrdm->name);
ret = -ENOENT;
goto pdc_exit;
}
pwrdm->pwrdm_clkdms[i] = NULL;
ret = 0;
pdc_exit:
return ret;
}
/**
* pwrdm_for_each_clkdm - call function on each clkdm in a pwrdm
* @pwrdm: struct powerdomain * to iterate over
* @fn: callback function *
*
* Call the supplied function @fn for each clockdomain in the powerdomain
* @pwrdm. The callback function can return anything but 0 to bail
* out early from the iterator. Returns -EINVAL if presented with
* invalid pointers; or passes along the last return value of the
* callback function, which should be 0 for success or anything else
* to indicate failure.
*/
int pwrdm_for_each_clkdm(struct powerdomain *pwrdm,
int (*fn)(struct powerdomain *pwrdm,
struct clockdomain *clkdm))
{
int ret = 0;
int i;
if (!fn)
return -EINVAL;
for (i = 0; i < PWRDM_MAX_CLKDMS && !ret; i++)
ret = (*fn)(pwrdm, pwrdm->pwrdm_clkdms[i]);
return ret;
}
/**
* pwrdm_get_mem_bank_count - get number of memory banks in this powerdomain
* @pwrdm: struct powerdomain *
*
* Return the number of controllable memory banks in powerdomain @pwrdm,
* starting with 1. Returns -EINVAL if the powerdomain pointer is null.
*/
int pwrdm_get_mem_bank_count(struct powerdomain *pwrdm)
{
if (!pwrdm)
return -EINVAL;
return pwrdm->banks;
}
/**
* pwrdm_set_next_pwrst - set next powerdomain power state
* @pwrdm: struct powerdomain * to set
* @pwrst: one of the PWRDM_POWER_* macros
*
* Set the powerdomain @pwrdm's next power state to @pwrst. The powerdomain
* may not enter this state immediately if the preconditions for this state
* have not been satisfied. Returns -EINVAL if the powerdomain pointer is
* null or if the power state is invalid for the powerdomin, or returns 0
* upon success.
*/
int pwrdm_set_next_pwrst(struct powerdomain *pwrdm, u8 pwrst)
{
int ret = -EINVAL;
if (!pwrdm)
return -EINVAL;
if (!(pwrdm->pwrsts & (1 << pwrst)))
return -EINVAL;
pr_debug("powerdomain: setting next powerstate for %s to %0x\n",
pwrdm->name, pwrst);
if (arch_pwrdm && arch_pwrdm->pwrdm_set_next_pwrst) {
/* Trace the pwrdm desired target state */
trace_power_domain_target(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.
*/
int pwrdm_read_pwrst(struct powerdomain *pwrdm)
{
int ret = -EINVAL;
if (!pwrdm)
return -EINVAL;
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: setting next logic powerstate for %s 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: 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;
}
/**
* 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 (IS_ERR_OR_NULL(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;
}
