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