| /* |
| * 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> |
| |
| enum { |
| PWRDM_STATE_NOW = 0, |
| PWRDM_STATE_PREV, |
| }; |
| |
| /* 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; |
| } |
| |
| static int _pwrdm_state_switch(struct powerdomain *pwrdm, int flag) |
| { |
| |
| int prev; |
| int state; |
| |
| 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]++; |
| break; |
| default: |
| return -EINVAL; |
| } |
| |
| if (state != prev) |
| pwrdm->state_counter[state]++; |
| |
| pwrdm->state = state; |
| |
| return 0; |
| } |
| |
| static int _pwrdm_pre_transition_cb(struct powerdomain *pwrdm) |
| { |
| pwrdm_clear_all_prev_pwrst(pwrdm); |
| _pwrdm_state_switch(pwrdm, PWRDM_STATE_NOW); |
| return 0; |
| } |
| |
| static int _pwrdm_post_transition_cb(struct powerdomain *pwrdm) |
| { |
| _pwrdm_state_switch(pwrdm, PWRDM_STATE_PREV); |
| return 0; |
| } |
| |
| static __init void _pwrdm_setup(struct powerdomain *pwrdm) |
| { |
| int i; |
| |
| for (i = 0; i < 4; i++) |
| pwrdm->state_counter[i] = 0; |
| |
| pwrdm_wait_transition(pwrdm); |
| pwrdm->state = pwrdm_read_pwrst(pwrdm); |
| pwrdm->state_counter[pwrdm->state] = 1; |
| |
| } |
| |
| /* 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_setup(*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; |
| } |
| |
| int pwrdm_state_switch(struct powerdomain *pwrdm) |
| { |
| return _pwrdm_state_switch(pwrdm, PWRDM_STATE_NOW); |
| } |
| |
| int pwrdm_clkdm_state_switch(struct clockdomain *clkdm) |
| { |
| if (clkdm != NULL && clkdm->pwrdm.ptr != NULL) { |
| pwrdm_wait_transition(clkdm->pwrdm.ptr); |
| return pwrdm_state_switch(clkdm->pwrdm.ptr); |
| } |
| |
| return -EINVAL; |
| } |
| int pwrdm_clk_state_switch(struct clk *clk) |
| { |
| if (clk != NULL && clk->clkdm != NULL) |
| return pwrdm_clkdm_state_switch(clk->clkdm); |
| return -EINVAL; |
| } |
| |
| int pwrdm_pre_transition(void) |
| { |
| pwrdm_for_each(_pwrdm_pre_transition_cb); |
| return 0; |
| } |
| |
| int pwrdm_post_transition(void) |
| { |
| pwrdm_for_each(_pwrdm_post_transition_cb); |
| return 0; |
| } |
| |