diff options
Diffstat (limited to 'ANDROID_3.4.5/arch/arm/mach-omap2/powerdomain.c')
| -rw-r--r-- | ANDROID_3.4.5/arch/arm/mach-omap2/powerdomain.c | 1080 |
1 files changed, 0 insertions, 1080 deletions
diff --git a/ANDROID_3.4.5/arch/arm/mach-omap2/powerdomain.c b/ANDROID_3.4.5/arch/arm/mach-omap2/powerdomain.c deleted file mode 100644 index 96ad3dbe..00000000 --- a/ANDROID_3.4.5/arch/arm/mach-omap2/powerdomain.c +++ /dev/null @@ -1,1080 +0,0 @@ -/* - * 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 <trace/events/power.h> - -#include "cm2xxx_3xxx.h" -#include "prcm44xx.h" -#include "cm44xx.h" -#include "prm2xxx_3xxx.h" -#include "prm44xx.h" - -#include <asm/cpu.h> -#include <plat/cpu.h> -#include "powerdomain.h" -#include "clockdomain.h" -#include <plat/prcm.h> - -#include "pm.h" - -#define PWRDM_TRACE_STATES_FLAG (1<<31) - -enum { - PWRDM_STATE_NOW = 0, - PWRDM_STATE_PREV, -}; - - -/* pwrdm_list contains all registered struct powerdomains */ -static LIST_HEAD(pwrdm_list); - -static struct pwrdm_ops *arch_pwrdm; - -/* Private functions */ - -static struct powerdomain *_pwrdm_lookup(const char *name) -{ - struct powerdomain *pwrdm, *temp_pwrdm; - - pwrdm = NULL; - - list_for_each_entry(temp_pwrdm, &pwrdm_list, node) { - if (!strcmp(name, temp_pwrdm->name)) { - pwrdm = temp_pwrdm; - break; - } - } - - return pwrdm; -} - -/** - * _pwrdm_register - register a powerdomain - * @pwrdm: struct powerdomain * to register - * - * Adds a powerdomain to the internal powerdomain list. Returns - * -EINVAL if given a null pointer, -EEXIST if a powerdomain is - * already registered by the provided name, or 0 upon success. - */ -static int _pwrdm_register(struct powerdomain *pwrdm) -{ - int i; - 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; - - 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); - - list_add(&pwrdm->node, &pwrdm_list); - - /* Initialize the powerdomain's state counter */ - for (i = 0; i < PWRDM_MAX_PWRSTS; i++) - pwrdm->state_counter[i] = 0; - - pwrdm->ret_logic_off_counter = 0; - for (i = 0; i < pwrdm->banks; i++) - pwrdm->ret_mem_off_counter[i] = 0; - - pwrdm_wait_transition(pwrdm); - pwrdm->state = pwrdm_read_pwrst(pwrdm); - pwrdm->state_counter[pwrdm->state] = 1; - - pr_debug("powerdomain: registered %s\n", pwrdm->name); - - return 0; -} - -static void _update_logic_membank_counters(struct powerdomain *pwrdm) -{ - int i; - u8 prev_logic_pwrst, prev_mem_pwrst; - - prev_logic_pwrst = pwrdm_read_prev_logic_pwrst(pwrdm); - if ((pwrdm->pwrsts_logic_ret == PWRSTS_OFF_RET) && - (prev_logic_pwrst == PWRDM_POWER_OFF)) - pwrdm->ret_logic_off_counter++; - - for (i = 0; i < pwrdm->banks; i++) { - prev_mem_pwrst = pwrdm_read_prev_mem_pwrst(pwrdm, i); - - if ((pwrdm->pwrsts_mem_ret[i] == PWRSTS_OFF_RET) && - (prev_mem_pwrst == PWRDM_POWER_OFF)) - pwrdm->ret_mem_off_counter[i]++; - } -} - -static int _pwrdm_state_switch(struct powerdomain *pwrdm, int flag) -{ - - int prev, state, trace_state = 0; - - if (pwrdm == NULL) - return -EINVAL; - - state = pwrdm_read_pwrst(pwrdm); - - switch (flag) { - case PWRDM_STATE_NOW: - prev = pwrdm->state; - break; - case PWRDM_STATE_PREV: - prev = pwrdm_read_prev_pwrst(pwrdm); - if (pwrdm->state != prev) - pwrdm->state_counter[prev]++; - if (prev == PWRDM_POWER_RET) - _update_logic_membank_counters(pwrdm); - /* - * If the power domain did not hit the desired state, - * generate a trace event with both the desired and hit states - */ - if (state != prev) { - trace_state = (PWRDM_TRACE_STATES_FLAG | - ((state & OMAP_POWERSTATE_MASK) << 8) | - ((prev & OMAP_POWERSTATE_MASK) << 0)); - trace_power_domain_target(pwrdm->name, trace_state, - smp_processor_id()); - } - break; - default: - return -EINVAL; - } - - if (state != prev) - pwrdm->state_counter[state]++; - - pm_dbg_update_time(pwrdm, prev); - - pwrdm->state = state; - - return 0; -} - -static int _pwrdm_pre_transition_cb(struct powerdomain *pwrdm, void *unused) -{ - pwrdm_clear_all_prev_pwrst(pwrdm); - _pwrdm_state_switch(pwrdm, PWRDM_STATE_NOW); - return 0; -} - -static int _pwrdm_post_transition_cb(struct powerdomain *pwrdm, void *unused) -{ - _pwrdm_state_switch(pwrdm, PWRDM_STATE_PREV); - return 0; -} - -/* Public functions */ - -/** - * pwrdm_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_lookup - look up a powerdomain by name, return a pointer - * @name: name of powerdomain - * - * Find a registered powerdomain by its name @name. Returns a pointer - * to the struct powerdomain if found, or NULL otherwise. - */ -struct powerdomain *pwrdm_lookup(const char *name) -{ - struct powerdomain *pwrdm; - - if (!name) - return NULL; - - pwrdm = _pwrdm_lookup(name); - - return pwrdm; -} - -/** - * pwrdm_for_each - call function on each registered clockdomain - * @fn: callback function * - * - * Call the supplied function @fn for each registered powerdomain. - * The callback function @fn can return anything but 0 to bail out - * early from the iterator. Returns the last return value of the - * callback function, which should be 0 for success or anything else - * to indicate failure; or -EINVAL if the function pointer is null. - */ -int pwrdm_for_each(int (*fn)(struct powerdomain *pwrdm, void *user), - void *user) -{ - struct powerdomain *temp_pwrdm; - int ret = 0; - - if (!fn) - return -EINVAL; - - list_for_each_entry(temp_pwrdm, &pwrdm_list, node) { - ret = (*fn)(temp_pwrdm, user); - if (ret) - break; - } - - return ret; -} - -/** - * pwrdm_add_clkdm - add a clockdomain to a powerdomain - * @pwrdm: struct powerdomain * to add the clockdomain to - * @clkdm: struct clockdomain * to associate with a powerdomain - * - * Associate the clockdomain @clkdm with a powerdomain @pwrdm. This - * enables the use of pwrdm_for_each_clkdm(). Returns -EINVAL if - * presented with invalid pointers; -ENOMEM if memory could not be allocated; - * or 0 upon success. - */ -int pwrdm_add_clkdm(struct powerdomain *pwrdm, struct clockdomain *clkdm) -{ - int i; - int ret = -EINVAL; - - if (!pwrdm || !clkdm) - return -EINVAL; - - pr_debug("powerdomain: associating clockdomain %s with powerdomain " - "%s\n", clkdm->name, pwrdm->name); - - for (i = 0; i < PWRDM_MAX_CLKDMS; i++) { - if (!pwrdm->pwrdm_clkdms[i]) - break; -#ifdef DEBUG - if (pwrdm->pwrdm_clkdms[i] == clkdm) { - ret = -EINVAL; - goto pac_exit; - } -#endif - } - - if (i == PWRDM_MAX_CLKDMS) { - pr_debug("powerdomain: increase PWRDM_MAX_CLKDMS for " - "pwrdm %s clkdm %s\n", pwrdm->name, clkdm->name); - WARN_ON(1); - ret = -ENOMEM; - goto pac_exit; - } - - pwrdm->pwrdm_clkdms[i] = clkdm; - - ret = 0; - -pac_exit: - return ret; -} - -/** - * pwrdm_del_clkdm - remove a clockdomain from a powerdomain - * @pwrdm: struct powerdomain * to add the clockdomain to - * @clkdm: struct clockdomain * to associate with a powerdomain - * - * Dissociate the clockdomain @clkdm from the powerdomain - * @pwrdm. Returns -EINVAL if presented with invalid pointers; -ENOENT - * if @clkdm was not associated with the powerdomain, or 0 upon - * success. - */ -int pwrdm_del_clkdm(struct powerdomain *pwrdm, struct clockdomain *clkdm) -{ - int ret = -EINVAL; - int i; - - if (!pwrdm || !clkdm) - return -EINVAL; - - pr_debug("powerdomain: dissociating clockdomain %s from powerdomain " - "%s\n", clkdm->name, pwrdm->name); - - for (i = 0; i < PWRDM_MAX_CLKDMS; i++) - if (pwrdm->pwrdm_clkdms[i] == clkdm) - break; - - if (i == PWRDM_MAX_CLKDMS) { - pr_debug("powerdomain: clkdm %s not associated with pwrdm " - "%s ?!\n", clkdm->name, pwrdm->name); - ret = -ENOENT; - goto pdc_exit; - } - - pwrdm->pwrdm_clkdms[i] = NULL; - - ret = 0; - -pdc_exit: - return ret; -} - -/** - * pwrdm_for_each_clkdm - call function on each clkdm in a pwrdm - * @pwrdm: struct powerdomain * to iterate over - * @fn: callback function * - * - * Call the supplied function @fn for each clockdomain in the powerdomain - * @pwrdm. The callback function can return anything but 0 to bail - * out early from the iterator. Returns -EINVAL if presented with - * invalid pointers; or passes along the last return value of the - * callback function, which should be 0 for success or anything else - * to indicate failure. - */ -int pwrdm_for_each_clkdm(struct powerdomain *pwrdm, - int (*fn)(struct powerdomain *pwrdm, - struct clockdomain *clkdm)) -{ - int ret = 0; - int i; - - if (!fn) - return -EINVAL; - - for (i = 0; i < PWRDM_MAX_CLKDMS && !ret; i++) - ret = (*fn)(pwrdm, pwrdm->pwrdm_clkdms[i]); - - return ret; -} - -/** - * pwrdm_get_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: setting next powerstate for %s to %0x\n", - pwrdm->name, pwrst); - - if (arch_pwrdm && arch_pwrdm->pwrdm_set_next_pwrst) { - /* Trace the pwrdm desired target state */ - trace_power_domain_target(pwrdm->name, pwrst, - smp_processor_id()); - /* Program the pwrdm desired target state */ - ret = arch_pwrdm->pwrdm_set_next_pwrst(pwrdm, pwrst); - } - - return ret; -} - -/** - * pwrdm_read_next_pwrst - get next powerdomain power state - * @pwrdm: struct powerdomain * to get power state - * - * Return the powerdomain @pwrdm's next power state. Returns -EINVAL - * if the powerdomain pointer is null or returns the next power state - * upon success. - */ -int pwrdm_read_next_pwrst(struct powerdomain *pwrdm) -{ - int ret = -EINVAL; - - if (!pwrdm) - return -EINVAL; - - if (arch_pwrdm && arch_pwrdm->pwrdm_read_next_pwrst) - ret = arch_pwrdm->pwrdm_read_next_pwrst(pwrdm); - - return ret; -} - -/** - * pwrdm_read_pwrst - get current powerdomain power state - * @pwrdm: struct powerdomain * to get power state - * - * Return the powerdomain @pwrdm's current power state. Returns -EINVAL - * if the powerdomain pointer is null or returns the current power state - * upon success. - */ -int pwrdm_read_pwrst(struct powerdomain *pwrdm) -{ - int ret = -EINVAL; - - if (!pwrdm) - return -EINVAL; - - if (arch_pwrdm && arch_pwrdm->pwrdm_read_pwrst) - ret = arch_pwrdm->pwrdm_read_pwrst(pwrdm); - - return ret; -} - -/** - * pwrdm_read_prev_pwrst - get previous powerdomain power state - * @pwrdm: struct powerdomain * to get previous power state - * - * Return the powerdomain @pwrdm's previous power state. Returns -EINVAL - * if the powerdomain pointer is null or returns the previous power state - * upon success. - */ -int pwrdm_read_prev_pwrst(struct powerdomain *pwrdm) -{ - int ret = -EINVAL; - - if (!pwrdm) - return -EINVAL; - - if (arch_pwrdm && arch_pwrdm->pwrdm_read_prev_pwrst) - ret = arch_pwrdm->pwrdm_read_prev_pwrst(pwrdm); - - return ret; -} - -/** - * pwrdm_set_logic_retst - set powerdomain logic power state upon retention - * @pwrdm: struct powerdomain * to set - * @pwrst: one of the PWRDM_POWER_* macros - * - * Set the next power state @pwrst that the logic portion of the - * powerdomain @pwrdm will enter when the powerdomain enters retention. - * This will be either RETENTION or OFF, if supported. Returns - * -EINVAL if the powerdomain pointer is null or the target power - * state is not not supported, or returns 0 upon success. - */ -int pwrdm_set_logic_retst(struct powerdomain *pwrdm, u8 pwrst) -{ - int ret = -EINVAL; - - if (!pwrdm) - return -EINVAL; - - if (!(pwrdm->pwrsts_logic_ret & (1 << pwrst))) - return -EINVAL; - - pr_debug("powerdomain: setting next logic powerstate for %s to %0x\n", - pwrdm->name, pwrst); - - if (arch_pwrdm && arch_pwrdm->pwrdm_set_logic_retst) - ret = arch_pwrdm->pwrdm_set_logic_retst(pwrdm, pwrst); - - return ret; -} - -/** - * pwrdm_set_mem_onst - set memory power state while powerdomain ON - * @pwrdm: struct powerdomain * to set - * @bank: memory bank number to set (0-3) - * @pwrst: one of the PWRDM_POWER_* macros - * - * Set the next power state @pwrst that memory bank @bank of the - * powerdomain @pwrdm will enter when the powerdomain enters the ON - * state. @bank will be a number from 0 to 3, and represents different - * types of memory, depending on the powerdomain. Returns -EINVAL if - * the powerdomain pointer is null or the target power state is not - * not supported for this memory bank, -EEXIST if the target memory - * bank does not exist or is not controllable, or returns 0 upon - * success. - */ -int pwrdm_set_mem_onst(struct powerdomain *pwrdm, u8 bank, u8 pwrst) -{ - int ret = -EINVAL; - - if (!pwrdm) - return -EINVAL; - - if (pwrdm->banks < (bank + 1)) - return -EEXIST; - - if (!(pwrdm->pwrsts_mem_on[bank] & (1 << pwrst))) - return -EINVAL; - - pr_debug("powerdomain: setting next memory powerstate for domain %s " - "bank %0x while pwrdm-ON to %0x\n", pwrdm->name, bank, pwrst); - - if (arch_pwrdm && arch_pwrdm->pwrdm_set_mem_onst) - ret = arch_pwrdm->pwrdm_set_mem_onst(pwrdm, bank, pwrst); - - return ret; -} - -/** - * pwrdm_set_mem_retst - set memory power state while powerdomain in RET - * @pwrdm: struct powerdomain * to set - * @bank: memory bank number to set (0-3) - * @pwrst: one of the PWRDM_POWER_* macros - * - * Set the next power state @pwrst that memory bank @bank of the - * powerdomain @pwrdm will enter when the powerdomain enters the - * RETENTION state. Bank will be a number from 0 to 3, and represents - * different types of memory, depending on the powerdomain. @pwrst - * will be either RETENTION or OFF, if supported. Returns -EINVAL if - * the powerdomain pointer is null or the target power state is not - * not supported for this memory bank, -EEXIST if the target memory - * bank does not exist or is not controllable, or returns 0 upon - * success. - */ -int pwrdm_set_mem_retst(struct powerdomain *pwrdm, u8 bank, u8 pwrst) -{ - int ret = -EINVAL; - - if (!pwrdm) - return -EINVAL; - - if (pwrdm->banks < (bank + 1)) - return -EEXIST; - - if (!(pwrdm->pwrsts_mem_ret[bank] & (1 << pwrst))) - return -EINVAL; - - pr_debug("powerdomain: setting next memory powerstate for domain %s " - "bank %0x while pwrdm-RET to %0x\n", pwrdm->name, bank, pwrst); - - if (arch_pwrdm && arch_pwrdm->pwrdm_set_mem_retst) - ret = arch_pwrdm->pwrdm_set_mem_retst(pwrdm, bank, pwrst); - - return ret; -} - -/** - * pwrdm_read_logic_pwrst - get current powerdomain logic retention power state - * @pwrdm: struct powerdomain * to get current logic retention power state - * - * Return the power state that the logic portion of powerdomain @pwrdm - * will enter when the powerdomain enters retention. Returns -EINVAL - * if the powerdomain pointer is null or returns the logic retention - * power state upon success. - */ -int pwrdm_read_logic_pwrst(struct powerdomain *pwrdm) -{ - int ret = -EINVAL; - - if (!pwrdm) - return -EINVAL; - - if (arch_pwrdm && arch_pwrdm->pwrdm_read_logic_pwrst) - ret = arch_pwrdm->pwrdm_read_logic_pwrst(pwrdm); - - return ret; -} - -/** - * pwrdm_read_prev_logic_pwrst - get previous powerdomain logic power state - * @pwrdm: struct powerdomain * to get previous logic power state - * - * Return the powerdomain @pwrdm's previous logic power state. Returns - * -EINVAL if the powerdomain pointer is null or returns the previous - * logic power state upon success. - */ -int pwrdm_read_prev_logic_pwrst(struct powerdomain *pwrdm) -{ - int ret = -EINVAL; - - if (!pwrdm) - return -EINVAL; - - if (arch_pwrdm && arch_pwrdm->pwrdm_read_prev_logic_pwrst) - ret = arch_pwrdm->pwrdm_read_prev_logic_pwrst(pwrdm); - - return ret; -} - -/** - * pwrdm_read_logic_retst - get next powerdomain logic power state - * @pwrdm: struct powerdomain * to get next logic power state - * - * Return the powerdomain pwrdm's logic power state. Returns -EINVAL - * if the powerdomain pointer is null or returns the next logic - * power state upon success. - */ -int pwrdm_read_logic_retst(struct powerdomain *pwrdm) -{ - int ret = -EINVAL; - - if (!pwrdm) - return -EINVAL; - - if (arch_pwrdm && arch_pwrdm->pwrdm_read_logic_retst) - ret = arch_pwrdm->pwrdm_read_logic_retst(pwrdm); - - return ret; -} - -/** - * pwrdm_read_mem_pwrst - get current memory bank power state - * @pwrdm: struct powerdomain * to get current memory bank power state - * @bank: memory bank number (0-3) - * - * Return the powerdomain @pwrdm's current memory power state for bank - * @bank. Returns -EINVAL if the powerdomain pointer is null, -EEXIST if - * the target memory bank does not exist or is not controllable, or - * returns the current memory power state upon success. - */ -int pwrdm_read_mem_pwrst(struct powerdomain *pwrdm, u8 bank) -{ - int ret = -EINVAL; - - if (!pwrdm) - return ret; - - if (pwrdm->banks < (bank + 1)) - return ret; - - if (pwrdm->flags & PWRDM_HAS_MPU_QUIRK) - bank = 1; - - if (arch_pwrdm && arch_pwrdm->pwrdm_read_mem_pwrst) - ret = arch_pwrdm->pwrdm_read_mem_pwrst(pwrdm, bank); - - return ret; -} - -/** - * pwrdm_read_prev_mem_pwrst - get previous memory bank power state - * @pwrdm: struct powerdomain * to get previous memory bank power state - * @bank: memory bank number (0-3) - * - * Return the powerdomain @pwrdm's previous memory power state for - * bank @bank. Returns -EINVAL if the powerdomain pointer is null, - * -EEXIST if the target memory bank does not exist or is not - * controllable, or returns the previous memory power state upon - * success. - */ -int pwrdm_read_prev_mem_pwrst(struct powerdomain *pwrdm, u8 bank) -{ - int ret = -EINVAL; - - if (!pwrdm) - return ret; - - if (pwrdm->banks < (bank + 1)) - return ret; - - if (pwrdm->flags & PWRDM_HAS_MPU_QUIRK) - bank = 1; - - if (arch_pwrdm && arch_pwrdm->pwrdm_read_prev_mem_pwrst) - ret = arch_pwrdm->pwrdm_read_prev_mem_pwrst(pwrdm, bank); - - return ret; -} - -/** - * pwrdm_read_mem_retst - get next memory bank power state - * @pwrdm: struct powerdomain * to get mext memory bank power state - * @bank: memory bank number (0-3) - * - * Return the powerdomain pwrdm's next memory power state for bank - * x. Returns -EINVAL if the powerdomain pointer is null, -EEXIST if - * the target memory bank does not exist or is not controllable, or - * returns the next memory power state upon success. - */ -int pwrdm_read_mem_retst(struct powerdomain *pwrdm, u8 bank) -{ - int ret = -EINVAL; - - if (!pwrdm) - return ret; - - if (pwrdm->banks < (bank + 1)) - return ret; - - if (arch_pwrdm && arch_pwrdm->pwrdm_read_mem_retst) - ret = arch_pwrdm->pwrdm_read_mem_retst(pwrdm, bank); - - return ret; -} - -/** - * pwrdm_clear_all_prev_pwrst - clear previous powerstate register for a pwrdm - * @pwrdm: struct powerdomain * to clear - * - * Clear the powerdomain's previous power state register @pwrdm. - * Clears the entire register, including logic and memory bank - * previous power states. Returns -EINVAL if the powerdomain pointer - * is null, or returns 0 upon success. - */ -int pwrdm_clear_all_prev_pwrst(struct powerdomain *pwrdm) -{ - int ret = -EINVAL; - - if (!pwrdm) - return ret; - - /* - * XXX should get the powerdomain's current state here; - * warn & fail if it is not ON. - */ - - pr_debug("powerdomain: clearing previous power state reg for %s\n", - pwrdm->name); - - if (arch_pwrdm && arch_pwrdm->pwrdm_clear_all_prev_pwrst) - ret = arch_pwrdm->pwrdm_clear_all_prev_pwrst(pwrdm); - - return ret; -} - -/** - * pwrdm_enable_hdwr_sar - enable automatic hardware SAR for a pwrdm - * @pwrdm: struct powerdomain * - * - * Enable automatic context save-and-restore upon power state change - * for some devices in the powerdomain @pwrdm. Warning: this only - * affects a subset of devices in a powerdomain; check the TRM - * closely. Returns -EINVAL if the powerdomain pointer is null or if - * the powerdomain does not support automatic save-and-restore, or - * returns 0 upon success. - */ -int pwrdm_enable_hdwr_sar(struct powerdomain *pwrdm) -{ - int ret = -EINVAL; - - if (!pwrdm) - return ret; - - if (!(pwrdm->flags & PWRDM_HAS_HDWR_SAR)) - return ret; - - pr_debug("powerdomain: %s: setting SAVEANDRESTORE bit\n", - pwrdm->name); - - if (arch_pwrdm && arch_pwrdm->pwrdm_enable_hdwr_sar) - ret = arch_pwrdm->pwrdm_enable_hdwr_sar(pwrdm); - - return ret; -} - -/** - * pwrdm_disable_hdwr_sar - disable automatic hardware SAR for a pwrdm - * @pwrdm: struct powerdomain * - * - * Disable automatic context save-and-restore upon power state change - * for some devices in the powerdomain @pwrdm. Warning: this only - * affects a subset of devices in a powerdomain; check the TRM - * closely. Returns -EINVAL if the powerdomain pointer is null or if - * the powerdomain does not support automatic save-and-restore, or - * returns 0 upon success. - */ -int pwrdm_disable_hdwr_sar(struct powerdomain *pwrdm) -{ - int ret = -EINVAL; - - if (!pwrdm) - return ret; - - if (!(pwrdm->flags & PWRDM_HAS_HDWR_SAR)) - return ret; - - pr_debug("powerdomain: %s: clearing SAVEANDRESTORE bit\n", - pwrdm->name); - - if (arch_pwrdm && arch_pwrdm->pwrdm_disable_hdwr_sar) - ret = arch_pwrdm->pwrdm_disable_hdwr_sar(pwrdm); - - return ret; -} - -/** - * pwrdm_has_hdwr_sar - test whether powerdomain supports hardware SAR - * @pwrdm: struct powerdomain * - * - * Returns 1 if powerdomain @pwrdm supports hardware save-and-restore - * for some devices, or 0 if it does not. - */ -bool pwrdm_has_hdwr_sar(struct powerdomain *pwrdm) -{ - return (pwrdm && pwrdm->flags & PWRDM_HAS_HDWR_SAR) ? 1 : 0; -} - -/** - * pwrdm_set_lowpwrstchange - Request a low power state change - * @pwrdm: struct powerdomain * - * - * Allows a powerdomain to transtion to a lower power sleep state - * from an existing sleep state without waking up the powerdomain. - * Returns -EINVAL if the powerdomain pointer is null or if the - * powerdomain does not support LOWPOWERSTATECHANGE, or returns 0 - * upon success. - */ -int pwrdm_set_lowpwrstchange(struct powerdomain *pwrdm) -{ - int ret = -EINVAL; - - if (!pwrdm) - return -EINVAL; - - if (!(pwrdm->flags & PWRDM_HAS_LOWPOWERSTATECHANGE)) - return -EINVAL; - - pr_debug("powerdomain: %s: setting LOWPOWERSTATECHANGE bit\n", - pwrdm->name); - - if (arch_pwrdm && arch_pwrdm->pwrdm_set_lowpwrstchange) - ret = arch_pwrdm->pwrdm_set_lowpwrstchange(pwrdm); - - return ret; -} - -/** - * pwrdm_wait_transition - wait for powerdomain power transition to finish - * @pwrdm: struct powerdomain * to wait for - * - * If the powerdomain @pwrdm is in the process of a state transition, - * spin until it completes the power transition, or until an iteration - * bailout value is reached. Returns -EINVAL if the powerdomain - * pointer is null, -EAGAIN if the bailout value was reached, or - * returns 0 upon success. - */ -int pwrdm_wait_transition(struct powerdomain *pwrdm) -{ - int ret = -EINVAL; - - if (!pwrdm) - return -EINVAL; - - if (arch_pwrdm && arch_pwrdm->pwrdm_wait_transition) - ret = arch_pwrdm->pwrdm_wait_transition(pwrdm); - - return ret; -} - -int pwrdm_state_switch(struct powerdomain *pwrdm) -{ - int ret; - - ret = pwrdm_wait_transition(pwrdm); - if (!ret) - ret = _pwrdm_state_switch(pwrdm, PWRDM_STATE_NOW); - - return ret; -} - -int pwrdm_clkdm_state_switch(struct clockdomain *clkdm) -{ - if (clkdm != NULL && clkdm->pwrdm.ptr != NULL) { - pwrdm_wait_transition(clkdm->pwrdm.ptr); - return pwrdm_state_switch(clkdm->pwrdm.ptr); - } - - return -EINVAL; -} - -int pwrdm_pre_transition(void) -{ - pwrdm_for_each(_pwrdm_pre_transition_cb, NULL); - return 0; -} - -int pwrdm_post_transition(void) -{ - pwrdm_for_each(_pwrdm_post_transition_cb, NULL); - return 0; -} - -/** - * pwrdm_get_context_loss_count - get powerdomain's context loss count - * @pwrdm: struct powerdomain * to wait for - * - * Context loss count is the sum of powerdomain off-mode counter, the - * logic off counter and the per-bank memory off counter. Returns 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 (IS_ERR_OR_NULL(pwrdm)) { - pr_debug("powerdomain: %s: invalid powerdomain pointer\n", - __func__); - return 1; - } - - if (pwrdm->pwrsts & PWRSTS_OFF) - return 1; - - if (pwrdm->pwrsts & PWRSTS_RET) { - if (pwrdm->pwrsts_logic_ret & PWRSTS_OFF) - return 1; - - for (i = 0; i < pwrdm->banks; i++) - if (pwrdm->pwrsts_mem_ret[i] & PWRSTS_OFF) - return 1; - } - - for (i = 0; i < pwrdm->banks; i++) - if (pwrdm->pwrsts_mem_on[i] & PWRSTS_OFF) - return 1; - - return 0; -} |