| /* |
| * OMAP powerdomain control |
| * |
| * Copyright (C) 2007-2008, 2011 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 <linux/spinlock.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 "powerdomain.h" |
| #include "clockdomain.h" |
| #include "voltage.h" |
| |
| #include "soc.h" |
| #include "pm.h" |
| |
| #define PWRDM_TRACE_STATES_FLAG (1<<31) |
| |
| enum { |
| PWRDM_STATE_NOW = 0, |
| PWRDM_STATE_PREV, |
| }; |
| |
| /* |
| * Types of sleep_switch used internally in omap_set_pwrdm_state() |
| * and its associated static functions |
| * |
| * XXX Better documentation is needed here |
| */ |
| #define ALREADYACTIVE_SWITCH 0 |
| #define FORCEWAKEUP_SWITCH 1 |
| #define LOWPOWERSTATE_SWITCH 2 |
| |
| /* 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; |
| struct voltagedomain *voltdm; |
| |
| if (!pwrdm || !pwrdm->name) |
| 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; |
| |
| if (arch_pwrdm && arch_pwrdm->pwrdm_has_voltdm) |
| if (!arch_pwrdm->pwrdm_has_voltdm()) |
| goto skip_voltdm; |
| |
| voltdm = voltdm_lookup(pwrdm->voltdm.name); |
| if (!voltdm) { |
| pr_err("powerdomain: %s: voltagedomain %s does not exist\n", |
| pwrdm->name, pwrdm->voltdm.name); |
| return -EINVAL; |
| } |
| pwrdm->voltdm.ptr = voltdm; |
| INIT_LIST_HEAD(&pwrdm->voltdm_node); |
| voltdm_add_pwrdm(voltdm, pwrdm); |
| skip_voltdm: |
| spin_lock_init(&pwrdm->_lock); |
| |
| 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; |
| |
| if (arch_pwrdm && arch_pwrdm->pwrdm_wait_transition) |
| arch_pwrdm->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, next, 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 |
| */ |
| next = pwrdm_read_next_pwrst(pwrdm); |
| if (next != prev) { |
| trace_state = (PWRDM_TRACE_STATES_FLAG | |
| ((next & 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; |
| } |
| |
| /** |
| * _pwrdm_save_clkdm_state_and_activate - prepare for power state change |
| * @pwrdm: struct powerdomain * to operate on |
| * @curr_pwrst: current power state of @pwrdm |
| * @pwrst: power state to switch to |
| * @hwsup: ptr to a bool to return whether the clkdm is hardware-supervised |
| * |
| * Determine whether the powerdomain needs to be turned on before |
| * attempting to switch power states. Called by |
| * omap_set_pwrdm_state(). NOTE that if the powerdomain contains |
| * multiple clockdomains, this code assumes that the first clockdomain |
| * supports software-supervised wakeup mode - potentially a problem. |
| * Returns the power state switch mode currently in use (see the |
| * "Types of sleep_switch" comment above). |
| */ |
| static u8 _pwrdm_save_clkdm_state_and_activate(struct powerdomain *pwrdm, |
| u8 curr_pwrst, u8 pwrst, |
| bool *hwsup) |
| { |
| u8 sleep_switch; |
| |
| if (curr_pwrst < PWRDM_POWER_ON) { |
| if (curr_pwrst > pwrst && |
| pwrdm->flags & PWRDM_HAS_LOWPOWERSTATECHANGE && |
| arch_pwrdm->pwrdm_set_lowpwrstchange) { |
| sleep_switch = LOWPOWERSTATE_SWITCH; |
| } else { |
| *hwsup = clkdm_in_hwsup(pwrdm->pwrdm_clkdms[0]); |
| clkdm_wakeup_nolock(pwrdm->pwrdm_clkdms[0]); |
| sleep_switch = FORCEWAKEUP_SWITCH; |
| } |
| } else { |
| sleep_switch = ALREADYACTIVE_SWITCH; |
| } |
| |
| return sleep_switch; |
| } |
| |
| /** |
| * _pwrdm_restore_clkdm_state - restore the clkdm hwsup state after pwrst change |
| * @pwrdm: struct powerdomain * to operate on |
| * @sleep_switch: return value from _pwrdm_save_clkdm_state_and_activate() |
| * @hwsup: should @pwrdm's first clockdomain be set to hardware-supervised mode? |
| * |
| * Restore the clockdomain state perturbed by |
| * _pwrdm_save_clkdm_state_and_activate(), and call the power state |
| * bookkeeping code. Called by omap_set_pwrdm_state(). NOTE that if |
| * the powerdomain contains multiple clockdomains, this assumes that |
| * the first associated clockdomain supports either |
| * hardware-supervised idle control in the register, or |
| * software-supervised sleep. No return value. |
| */ |
| static void _pwrdm_restore_clkdm_state(struct powerdomain *pwrdm, |
| u8 sleep_switch, bool hwsup) |
| { |
| switch (sleep_switch) { |
| case FORCEWAKEUP_SWITCH: |
| if (hwsup) |
| clkdm_allow_idle_nolock(pwrdm->pwrdm_clkdms[0]); |
| else |
| clkdm_sleep_nolock(pwrdm->pwrdm_clkdms[0]); |
| break; |
| case LOWPOWERSTATE_SWITCH: |
| if (pwrdm->flags & PWRDM_HAS_LOWPOWERSTATECHANGE && |
| arch_pwrdm->pwrdm_set_lowpwrstchange) |
| arch_pwrdm->pwrdm_set_lowpwrstchange(pwrdm); |
| pwrdm_state_switch_nolock(pwrdm); |
| break; |
| } |
| } |
| |
| /* Public functions */ |
| |
| /** |
| * pwrdm_register_platform_funcs - register powerdomain implementation fns |
| * @po: func pointers for arch specific implementations |
| * |
| * Register the list of function pointers used to implement the |
| * powerdomain functions on different OMAP SoCs. Should be called |
| * before any other pwrdm_register*() function. Returns -EINVAL if |
| * @po is null, -EEXIST if platform functions have already been |
| * registered, or 0 upon success. |
| */ |
| int pwrdm_register_platform_funcs(struct pwrdm_ops *po) |
| { |
| if (!po) |
| return -EINVAL; |
| |
| if (arch_pwrdm) |
| return -EEXIST; |
| |
| arch_pwrdm = po; |
| |
| return 0; |
| } |
| |
| /** |
| * pwrdm_register_pwrdms - register SoC powerdomains |
| * @ps: pointer to an array of struct powerdomain to register |
| * |
| * Register the powerdomains available on a particular OMAP SoC. Must |
| * be called after pwrdm_register_platform_funcs(). May be called |
| * multiple times. Returns -EACCES if called before |
| * pwrdm_register_platform_funcs(); -EINVAL if the argument @ps is |
| * null; or 0 upon success. |
| */ |
| int pwrdm_register_pwrdms(struct powerdomain **ps) |
| { |
| struct powerdomain **p = NULL; |
| |
| if (!arch_pwrdm) |
| return -EEXIST; |
| |
| if (!ps) |
| return -EINVAL; |
| |
| for (p = ps; *p; p++) |
| _pwrdm_register(*p); |
| |
| return 0; |
| } |
| |
| /** |
| * pwrdm_complete_init - set up the powerdomain layer |
| * |
| * Do whatever is necessary to initialize registered powerdomains and |
| * powerdomain code. Currently, this programs the next power state |
| * for each powerdomain to ON. This prevents powerdomains from |
| * unexpectedly losing context or entering high wakeup latency modes |
| * with non-power-management-enabled kernels. Must be called after |
| * pwrdm_register_pwrdms(). Returns -EACCES if called before |
| * pwrdm_register_pwrdms(), or 0 upon success. |
| */ |
| int pwrdm_complete_init(void) |
| { |
| struct powerdomain *temp_p; |
| |
| if (list_empty(&pwrdm_list)) |
| return -EACCES; |
| |
| list_for_each_entry(temp_p, &pwrdm_list, node) |
| pwrdm_set_next_pwrst(temp_p, PWRDM_POWER_ON); |
| |
| return 0; |
| } |
| |
| /** |
| * pwrdm_lock - acquire a Linux spinlock on a powerdomain |
| * @pwrdm: struct powerdomain * to lock |
| * |
| * Acquire the powerdomain spinlock on @pwrdm. No return value. |
| */ |
| void pwrdm_lock(struct powerdomain *pwrdm) |
| __acquires(&pwrdm->_lock) |
| { |
| spin_lock_irqsave(&pwrdm->_lock, pwrdm->_lock_flags); |
| } |
| |
| /** |
| * pwrdm_unlock - release a Linux spinlock on a powerdomain |
| * @pwrdm: struct powerdomain * to unlock |
| * |
| * Release the powerdomain spinlock on @pwrdm. No return value. |
| */ |
| void pwrdm_unlock(struct powerdomain *pwrdm) |
| __releases(&pwrdm->_lock) |
| { |
| spin_unlock_irqrestore(&pwrdm->_lock, pwrdm->_lock_flags); |
| } |
| |
| /** |
| * 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: %s: associating clockdomain %s\n", |
| pwrdm->name, clkdm->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: %s: increase PWRDM_MAX_CLKDMS for 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: %s: dissociating clockdomain %s\n", |
| pwrdm->name, clkdm->name); |
| |
| for (i = 0; i < PWRDM_MAX_CLKDMS; i++) |
| if (pwrdm->pwrdm_clkdms[i] == clkdm) |
| break; |
| |
| if (i == PWRDM_MAX_CLKDMS) { |
| pr_debug("powerdomain: %s: clkdm %s not associated?!\n", |
| pwrdm->name, clkdm->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_voltdm - return a ptr to the voltdm that this pwrdm resides in |
| * @pwrdm: struct powerdomain * |
| * |
| * Return a pointer to the struct voltageomain that the specified powerdomain |
| * @pwrdm exists in. |
| */ |
| struct voltagedomain *pwrdm_get_voltdm(struct powerdomain *pwrdm) |
| { |
| return pwrdm->voltdm.ptr; |
| } |
| |
| /** |
| * 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: %s: setting next powerstate to %0x\n", |
| pwrdm->name, pwrst); |
| |
| if (arch_pwrdm && arch_pwrdm->pwrdm_set_next_pwrst) { |
| /* Trace the pwrdm desired target state */ |
| trace_power_domain_target(pwrdm->name, pwrst, |
| smp_processor_id()); |
| /* Program the pwrdm desired target state */ |
| ret = arch_pwrdm->pwrdm_set_next_pwrst(pwrdm, pwrst); |
| } |
| |
| return ret; |
| } |
| |
| /** |
| * pwrdm_read_next_pwrst - get next powerdomain power state |
| * @pwrdm: struct powerdomain * to get power state |
| * |
| * Return the powerdomain @pwrdm's next power state. Returns -EINVAL |
| * if the powerdomain pointer is null or returns the next power state |
| * upon success. |
| */ |
| int pwrdm_read_next_pwrst(struct powerdomain *pwrdm) |
| { |
| int ret = -EINVAL; |
| |
| if (!pwrdm) |
| return -EINVAL; |
| |
| if (arch_pwrdm && arch_pwrdm->pwrdm_read_next_pwrst) |
| ret = arch_pwrdm->pwrdm_read_next_pwrst(pwrdm); |
| |
| return ret; |
| } |
| |
| /** |
| * pwrdm_read_pwrst - get current powerdomain power state |
| * @pwrdm: struct powerdomain * to get power state |
| * |
| * Return the powerdomain @pwrdm's current power state. Returns -EINVAL |
| * if the powerdomain pointer is null or returns the current power state |
| * upon success. Note that if the power domain only supports the ON state |
| * then just return ON as the current state. |
| */ |
| int pwrdm_read_pwrst(struct powerdomain *pwrdm) |
| { |
| int ret = -EINVAL; |
| |
| if (!pwrdm) |
| return -EINVAL; |
| |
| if (pwrdm->pwrsts == PWRSTS_ON) |
| return PWRDM_POWER_ON; |
| |
| if (arch_pwrdm && arch_pwrdm->pwrdm_read_pwrst) |
| ret = arch_pwrdm->pwrdm_read_pwrst(pwrdm); |
| |
| return ret; |
| } |
| |
| /** |
| * pwrdm_read_prev_pwrst - get previous powerdomain power state |
| * @pwrdm: struct powerdomain * to get previous power state |
| * |
| * Return the powerdomain @pwrdm's previous power state. Returns -EINVAL |
| * if the powerdomain pointer is null or returns the previous power state |
| * upon success. |
| */ |
| int pwrdm_read_prev_pwrst(struct powerdomain *pwrdm) |
| { |
| int ret = -EINVAL; |
| |
| if (!pwrdm) |
| return -EINVAL; |
| |
| if (arch_pwrdm && arch_pwrdm->pwrdm_read_prev_pwrst) |
| ret = arch_pwrdm->pwrdm_read_prev_pwrst(pwrdm); |
| |
| return ret; |
| } |
| |
| /** |
| * pwrdm_set_logic_retst - set powerdomain logic power state upon retention |
| * @pwrdm: struct powerdomain * to set |
| * @pwrst: one of the PWRDM_POWER_* macros |
| * |
| * Set the next power state @pwrst that the logic portion of the |
| * powerdomain @pwrdm will enter when the powerdomain enters retention. |
| * This will be either RETENTION or OFF, if supported. Returns |
| * -EINVAL if the powerdomain pointer is null or the target power |
| * state is not not supported, or returns 0 upon success. |
| */ |
| int pwrdm_set_logic_retst(struct powerdomain *pwrdm, u8 pwrst) |
| { |
| int ret = -EINVAL; |
| |
| if (!pwrdm) |
| return -EINVAL; |
| |
| if (!(pwrdm->pwrsts_logic_ret & (1 << pwrst))) |
| return -EINVAL; |
| |
| pr_debug("powerdomain: %s: setting next logic powerstate to %0x\n", |
| pwrdm->name, pwrst); |
| |
| if (arch_pwrdm && arch_pwrdm->pwrdm_set_logic_retst) |
| ret = arch_pwrdm->pwrdm_set_logic_retst(pwrdm, pwrst); |
| |
| return ret; |
| } |
| |
| /** |
| * pwrdm_set_mem_onst - set memory power state while powerdomain ON |
| * @pwrdm: struct powerdomain * to set |
| * @bank: memory bank number to set (0-3) |
| * @pwrst: one of the PWRDM_POWER_* macros |
| * |
| * Set the next power state @pwrst that memory bank @bank of the |
| * powerdomain @pwrdm will enter when the powerdomain enters the ON |
| * state. @bank will be a number from 0 to 3, and represents different |
| * types of memory, depending on the powerdomain. Returns -EINVAL if |
| * the powerdomain pointer is null or the target power state is not |
| * not supported for this memory bank, -EEXIST if the target memory |
| * bank does not exist or is not controllable, or returns 0 upon |
| * success. |
| */ |
| int pwrdm_set_mem_onst(struct powerdomain *pwrdm, u8 bank, u8 pwrst) |
| { |
| int ret = -EINVAL; |
| |
| if (!pwrdm) |
| return -EINVAL; |
| |
| if (pwrdm->banks < (bank + 1)) |
| return -EEXIST; |
| |
| if (!(pwrdm->pwrsts_mem_on[bank] & (1 << pwrst))) |
| return -EINVAL; |
| |
| pr_debug("powerdomain: %s: setting next memory powerstate for bank %0x while pwrdm-ON to %0x\n", |
| pwrdm->name, bank, pwrst); |
| |
| if (arch_pwrdm && arch_pwrdm->pwrdm_set_mem_onst) |
| ret = arch_pwrdm->pwrdm_set_mem_onst(pwrdm, bank, pwrst); |
| |
| return ret; |
| } |
| |
| /** |
| * pwrdm_set_mem_retst - set memory power state while powerdomain in RET |
| * @pwrdm: struct powerdomain * to set |
| * @bank: memory bank number to set (0-3) |
| * @pwrst: one of the PWRDM_POWER_* macros |
| * |
| * Set the next power state @pwrst that memory bank @bank of the |
| * powerdomain @pwrdm will enter when the powerdomain enters the |
| * RETENTION state. Bank will be a number from 0 to 3, and represents |
| * different types of memory, depending on the powerdomain. @pwrst |
| * will be either RETENTION or OFF, if supported. Returns -EINVAL if |
| * the powerdomain pointer is null or the target power state is not |
| * not supported for this memory bank, -EEXIST if the target memory |
| * bank does not exist or is not controllable, or returns 0 upon |
| * success. |
| */ |
| int pwrdm_set_mem_retst(struct powerdomain *pwrdm, u8 bank, u8 pwrst) |
| { |
| int ret = -EINVAL; |
| |
| if (!pwrdm) |
| return -EINVAL; |
| |
| if (pwrdm->banks < (bank + 1)) |
| return -EEXIST; |
| |
| if (!(pwrdm->pwrsts_mem_ret[bank] & (1 << pwrst))) |
| return -EINVAL; |
| |
| pr_debug("powerdomain: %s: setting next memory powerstate for bank %0x while pwrdm-RET to %0x\n", |
| pwrdm->name, bank, pwrst); |
| |
| if (arch_pwrdm && arch_pwrdm->pwrdm_set_mem_retst) |
| ret = arch_pwrdm->pwrdm_set_mem_retst(pwrdm, bank, pwrst); |
| |
| return ret; |
| } |
| |
| /** |
| * pwrdm_read_logic_pwrst - get current powerdomain logic retention power state |
| * @pwrdm: struct powerdomain * to get current logic retention power state |
| * |
| * Return the power state that the logic portion of powerdomain @pwrdm |
| * will enter when the powerdomain enters retention. Returns -EINVAL |
| * if the powerdomain pointer is null or returns the logic retention |
| * power state upon success. |
| */ |
| int pwrdm_read_logic_pwrst(struct powerdomain *pwrdm) |
| { |
| int ret = -EINVAL; |
| |
| if (!pwrdm) |
| return -EINVAL; |
| |
| if (arch_pwrdm && arch_pwrdm->pwrdm_read_logic_pwrst) |
| ret = arch_pwrdm->pwrdm_read_logic_pwrst(pwrdm); |
| |
| return ret; |
| } |
| |
| /** |
| * pwrdm_read_prev_logic_pwrst - get previous powerdomain logic power state |
| * @pwrdm: struct powerdomain * to get previous logic power state |
| * |
| * Return the powerdomain @pwrdm's previous logic power state. Returns |
| * -EINVAL if the powerdomain pointer is null or returns the previous |
| * logic power state upon success. |
| */ |
| int pwrdm_read_prev_logic_pwrst(struct powerdomain *pwrdm) |
| { |
| int ret = -EINVAL; |
| |
| if (!pwrdm) |
| return -EINVAL; |
| |
| if (arch_pwrdm && arch_pwrdm->pwrdm_read_prev_logic_pwrst) |
| ret = arch_pwrdm->pwrdm_read_prev_logic_pwrst(pwrdm); |
| |
| return ret; |
| } |
| |
| /** |
| * pwrdm_read_logic_retst - get next powerdomain logic power state |
| * @pwrdm: struct powerdomain * to get next logic power state |
| * |
| * Return the powerdomain pwrdm's logic power state. Returns -EINVAL |
| * if the powerdomain pointer is null or returns the next logic |
| * power state upon success. |
| */ |
| int pwrdm_read_logic_retst(struct powerdomain *pwrdm) |
| { |
| int ret = -EINVAL; |
| |
| if (!pwrdm) |
| return -EINVAL; |
| |
| if (arch_pwrdm && arch_pwrdm->pwrdm_read_logic_retst) |
| ret = arch_pwrdm->pwrdm_read_logic_retst(pwrdm); |
| |
| return ret; |
| } |
| |
| /** |
| * pwrdm_read_mem_pwrst - get current memory bank power state |
| * @pwrdm: struct powerdomain * to get current memory bank power state |
| * @bank: memory bank number (0-3) |
| * |
| * Return the powerdomain @pwrdm's current memory power state for bank |
| * @bank. Returns -EINVAL if the powerdomain pointer is null, -EEXIST if |
| * the target memory bank does not exist or is not controllable, or |
| * returns the current memory power state upon success. |
| */ |
| int pwrdm_read_mem_pwrst(struct powerdomain *pwrdm, u8 bank) |
| { |
| int ret = -EINVAL; |
| |
| if (!pwrdm) |
| return ret; |
| |
| if (pwrdm->banks < (bank + 1)) |
| return ret; |
| |
| if (pwrdm->flags & PWRDM_HAS_MPU_QUIRK) |
| bank = 1; |
| |
| if (arch_pwrdm && arch_pwrdm->pwrdm_read_mem_pwrst) |
| ret = arch_pwrdm->pwrdm_read_mem_pwrst(pwrdm, bank); |
| |
| return ret; |
| } |
| |
| /** |
| * pwrdm_read_prev_mem_pwrst - get previous memory bank power state |
| * @pwrdm: struct powerdomain * to get previous memory bank power state |
| * @bank: memory bank number (0-3) |
| * |
| * Return the powerdomain @pwrdm's previous memory power state for |
| * bank @bank. Returns -EINVAL if the powerdomain pointer is null, |
| * -EEXIST if the target memory bank does not exist or is not |
| * controllable, or returns the previous memory power state upon |
| * success. |
| */ |
| int pwrdm_read_prev_mem_pwrst(struct powerdomain *pwrdm, u8 bank) |
| { |
| int ret = -EINVAL; |
| |
| if (!pwrdm) |
| return ret; |
| |
| if (pwrdm->banks < (bank + 1)) |
| return ret; |
| |
| if (pwrdm->flags & PWRDM_HAS_MPU_QUIRK) |
| bank = 1; |
| |
| if (arch_pwrdm && arch_pwrdm->pwrdm_read_prev_mem_pwrst) |
| ret = arch_pwrdm->pwrdm_read_prev_mem_pwrst(pwrdm, bank); |
| |
| return ret; |
| } |
| |
| /** |
| * pwrdm_read_mem_retst - get next memory bank power state |
| * @pwrdm: struct powerdomain * to get mext memory bank power state |
| * @bank: memory bank number (0-3) |
| * |
| * Return the powerdomain pwrdm's next memory power state for bank |
| * x. Returns -EINVAL if the powerdomain pointer is null, -EEXIST if |
| * the target memory bank does not exist or is not controllable, or |
| * returns the next memory power state upon success. |
| */ |
| int pwrdm_read_mem_retst(struct powerdomain *pwrdm, u8 bank) |
| { |
| int ret = -EINVAL; |
| |
| if (!pwrdm) |
| return ret; |
| |
| if (pwrdm->banks < (bank + 1)) |
| return ret; |
| |
| if (arch_pwrdm && arch_pwrdm->pwrdm_read_mem_retst) |
| ret = arch_pwrdm->pwrdm_read_mem_retst(pwrdm, bank); |
| |
| return ret; |
| } |
| |
| /** |
| * pwrdm_clear_all_prev_pwrst - clear previous powerstate register for a pwrdm |
| * @pwrdm: struct powerdomain * to clear |
| * |
| * Clear the powerdomain's previous power state register @pwrdm. |
| * Clears the entire register, including logic and memory bank |
| * previous power states. Returns -EINVAL if the powerdomain pointer |
| * is null, or returns 0 upon success. |
| */ |
| int pwrdm_clear_all_prev_pwrst(struct powerdomain *pwrdm) |
| { |
| int ret = -EINVAL; |
| |
| if (!pwrdm) |
| return ret; |
| |
| /* |
| * XXX should get the powerdomain's current state here; |
| * warn & fail if it is not ON. |
| */ |
| |
| pr_debug("powerdomain: %s: clearing previous power state reg\n", |
| pwrdm->name); |
| |
| if (arch_pwrdm && arch_pwrdm->pwrdm_clear_all_prev_pwrst) |
| ret = arch_pwrdm->pwrdm_clear_all_prev_pwrst(pwrdm); |
| |
| return ret; |
| } |
| |
| /** |
| * pwrdm_enable_hdwr_sar - enable automatic hardware SAR for a pwrdm |
| * @pwrdm: struct powerdomain * |
| * |
| * Enable automatic context save-and-restore upon power state change |
| * for some devices in the powerdomain @pwrdm. Warning: this only |
| * affects a subset of devices in a powerdomain; check the TRM |
| * closely. Returns -EINVAL if the powerdomain pointer is null or if |
| * the powerdomain does not support automatic save-and-restore, or |
| * returns 0 upon success. |
| */ |
| int pwrdm_enable_hdwr_sar(struct powerdomain *pwrdm) |
| { |
| int ret = -EINVAL; |
| |
| if (!pwrdm) |
| return ret; |
| |
| if (!(pwrdm->flags & PWRDM_HAS_HDWR_SAR)) |
| return ret; |
| |
| pr_debug("powerdomain: %s: setting SAVEANDRESTORE bit\n", pwrdm->name); |
| |
| if (arch_pwrdm && arch_pwrdm->pwrdm_enable_hdwr_sar) |
| ret = arch_pwrdm->pwrdm_enable_hdwr_sar(pwrdm); |
| |
| return ret; |
| } |
| |
| /** |
| * pwrdm_disable_hdwr_sar - disable automatic hardware SAR for a pwrdm |
| * @pwrdm: struct powerdomain * |
| * |
| * Disable automatic context save-and-restore upon power state change |
| * for some devices in the powerdomain @pwrdm. Warning: this only |
| * affects a subset of devices in a powerdomain; check the TRM |
| * closely. Returns -EINVAL if the powerdomain pointer is null or if |
| * the powerdomain does not support automatic save-and-restore, or |
| * returns 0 upon success. |
| */ |
| int pwrdm_disable_hdwr_sar(struct powerdomain *pwrdm) |
| { |
| int ret = -EINVAL; |
| |
| if (!pwrdm) |
| return ret; |
| |
| if (!(pwrdm->flags & PWRDM_HAS_HDWR_SAR)) |
| return ret; |
| |
| pr_debug("powerdomain: %s: clearing SAVEANDRESTORE bit\n", pwrdm->name); |
| |
| if (arch_pwrdm && arch_pwrdm->pwrdm_disable_hdwr_sar) |
| ret = arch_pwrdm->pwrdm_disable_hdwr_sar(pwrdm); |
| |
| return ret; |
| } |
| |
| /** |
| * pwrdm_has_hdwr_sar - test whether powerdomain supports hardware SAR |
| * @pwrdm: struct powerdomain * |
| * |
| * Returns 1 if powerdomain @pwrdm supports hardware save-and-restore |
| * for some devices, or 0 if it does not. |
| */ |
| bool pwrdm_has_hdwr_sar(struct powerdomain *pwrdm) |
| { |
| return (pwrdm && pwrdm->flags & PWRDM_HAS_HDWR_SAR) ? 1 : 0; |
| } |
| |
| int pwrdm_state_switch_nolock(struct powerdomain *pwrdm) |
| { |
| int ret; |
| |
| if (!pwrdm || !arch_pwrdm) |
| return -EINVAL; |
| |
| ret = arch_pwrdm->pwrdm_wait_transition(pwrdm); |
| if (!ret) |
| ret = _pwrdm_state_switch(pwrdm, PWRDM_STATE_NOW); |
| |
| return ret; |
| } |
| |
| int __deprecated pwrdm_state_switch(struct powerdomain *pwrdm) |
| { |
| int ret; |
| |
| pwrdm_lock(pwrdm); |
| ret = pwrdm_state_switch_nolock(pwrdm); |
| pwrdm_unlock(pwrdm); |
| |
| return ret; |
| } |
| |
| int pwrdm_pre_transition(struct powerdomain *pwrdm) |
| { |
| if (pwrdm) |
| _pwrdm_pre_transition_cb(pwrdm, NULL); |
| else |
| pwrdm_for_each(_pwrdm_pre_transition_cb, NULL); |
| |
| return 0; |
| } |
| |
| int pwrdm_post_transition(struct powerdomain *pwrdm) |
| { |
| if (pwrdm) |
| _pwrdm_post_transition_cb(pwrdm, NULL); |
| else |
| pwrdm_for_each(_pwrdm_post_transition_cb, NULL); |
| |
| return 0; |
| } |
| |
| /** |
| * omap_set_pwrdm_state - change a powerdomain's current power state |
| * @pwrdm: struct powerdomain * to change the power state of |
| * @pwrst: power state to change to |
| * |
| * Change the current hardware power state of the powerdomain |
| * represented by @pwrdm to the power state represented by @pwrst. |
| * Returns -EINVAL if @pwrdm is null or invalid or if the |
| * powerdomain's current power state could not be read, or returns 0 |
| * upon success or if @pwrdm does not support @pwrst or any |
| * lower-power state. XXX Should not return 0 if the @pwrdm does not |
| * support @pwrst or any lower-power state: this should be an error. |
| */ |
| int omap_set_pwrdm_state(struct powerdomain *pwrdm, u8 pwrst) |
| { |
| u8 next_pwrst, sleep_switch; |
| int curr_pwrst; |
| int ret = 0; |
| bool hwsup = false; |
| |
| if (!pwrdm || IS_ERR(pwrdm)) |
| return -EINVAL; |
| |
| while (!(pwrdm->pwrsts & (1 << pwrst))) { |
| if (pwrst == PWRDM_POWER_OFF) |
| return ret; |
| pwrst--; |
| } |
| |
| pwrdm_lock(pwrdm); |
| |
| curr_pwrst = pwrdm_read_pwrst(pwrdm); |
| if (curr_pwrst < 0) { |
| ret = -EINVAL; |
| goto osps_out; |
| } |
| |
| next_pwrst = pwrdm_read_next_pwrst(pwrdm); |
| if (curr_pwrst == pwrst && next_pwrst == pwrst) |
| goto osps_out; |
| |
| sleep_switch = _pwrdm_save_clkdm_state_and_activate(pwrdm, curr_pwrst, |
| pwrst, &hwsup); |
| |
| ret = pwrdm_set_next_pwrst(pwrdm, pwrst); |
| if (ret) |
| pr_err("%s: unable to set power state of powerdomain: %s\n", |
| __func__, pwrdm->name); |
| |
| _pwrdm_restore_clkdm_state(pwrdm, sleep_switch, hwsup); |
| |
| osps_out: |
| pwrdm_unlock(pwrdm); |
| |
| return ret; |
| } |
| |
| /** |
| * pwrdm_get_context_loss_count - get powerdomain's context loss count |
| * @pwrdm: struct powerdomain * to wait for |
| * |
| * Context loss count is the sum of powerdomain off-mode counter, the |
| * logic off counter and the per-bank memory off counter. Returns negative |
| * (and WARNs) upon error, otherwise, returns the context loss count. |
| */ |
| int pwrdm_get_context_loss_count(struct powerdomain *pwrdm) |
| { |
| int i, count; |
| |
| if (!pwrdm) { |
| WARN(1, "powerdomain: %s: pwrdm is null\n", __func__); |
| return -ENODEV; |
| } |
| |
| count = pwrdm->state_counter[PWRDM_POWER_OFF]; |
| count += pwrdm->ret_logic_off_counter; |
| |
| for (i = 0; i < pwrdm->banks; i++) |
| count += pwrdm->ret_mem_off_counter[i]; |
| |
| /* |
| * Context loss count has to be a non-negative value. Clear the sign |
| * bit to get a value range from 0 to INT_MAX. |
| */ |
| count &= INT_MAX; |
| |
| pr_debug("powerdomain: %s: context loss count = %d\n", |
| pwrdm->name, count); |
| |
| return count; |
| } |
| |
| /** |
| * pwrdm_can_ever_lose_context - can this powerdomain ever lose context? |
| * @pwrdm: struct powerdomain * |
| * |
| * Given a struct powerdomain * @pwrdm, returns 1 if the powerdomain |
| * can lose either memory or logic context or if @pwrdm is invalid, or |
| * returns 0 otherwise. This function is not concerned with how the |
| * powerdomain registers are programmed (i.e., to go off or not); it's |
| * concerned with whether it's ever possible for this powerdomain to |
| * go off while some other part of the chip is active. This function |
| * assumes that every powerdomain can go to either ON or INACTIVE. |
| */ |
| bool pwrdm_can_ever_lose_context(struct powerdomain *pwrdm) |
| { |
| int i; |
| |
| if (!pwrdm) { |
| pr_debug("powerdomain: %s: invalid powerdomain pointer\n", |
| __func__); |
| return 1; |
| } |
| |
| if (pwrdm->pwrsts & PWRSTS_OFF) |
| return 1; |
| |
| if (pwrdm->pwrsts & PWRSTS_RET) { |
| if (pwrdm->pwrsts_logic_ret & PWRSTS_OFF) |
| return 1; |
| |
| for (i = 0; i < pwrdm->banks; i++) |
| if (pwrdm->pwrsts_mem_ret[i] & PWRSTS_OFF) |
| return 1; |
| } |
| |
| for (i = 0; i < pwrdm->banks; i++) |
| if (pwrdm->pwrsts_mem_on[i] & PWRSTS_OFF) |
| return 1; |
| |
| return 0; |
| } |