diff options
Diffstat (limited to 'arch/arm/mach-omap2/powerdomain.c')
| -rw-r--r-- | arch/arm/mach-omap2/powerdomain.c | 909 |
1 files changed, 909 insertions, 0 deletions
diff --git a/arch/arm/mach-omap2/powerdomain.c b/arch/arm/mach-omap2/powerdomain.c new file mode 100644 index 000000000000..1ec003832ef8 --- /dev/null +++ b/arch/arm/mach-omap2/powerdomain.c @@ -0,0 +1,909 @@ +/* + * 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> + +/* pwrdm_list contains all registered struct powerdomains */ +static LIST_HEAD(pwrdm_list); + +/* + * pwrdm_rwlock protects pwrdm_list add and del ops - also reused to + * protect pwrdm_clkdms[] during clkdm add/del ops + */ +static DEFINE_RWLOCK(pwrdm_rwlock); + + +/* Private functions */ + +static u32 prm_read_mod_bits_shift(s16 domain, s16 idx, u32 mask) +{ + u32 v; + + v = prm_read_mod_reg(domain, idx); + v &= mask; + v >>= __ffs(mask); + + return v; +} + +static struct powerdomain *_pwrdm_lookup(const char *name) +{ + struct powerdomain *pwrdm, *temp_pwrdm; + + pwrdm = NULL; + + list_for_each_entry(temp_pwrdm, &pwrdm_list, node) { + if (!strcmp(name, temp_pwrdm->name)) { + pwrdm = temp_pwrdm; + break; + } + } + + return pwrdm; +} + +/* _pwrdm_deps_lookup - look up the specified powerdomain in a pwrdm list */ +static struct powerdomain *_pwrdm_deps_lookup(struct powerdomain *pwrdm, + struct pwrdm_dep *deps) +{ + struct pwrdm_dep *pd; + + if (!pwrdm || !deps || !omap_chip_is(pwrdm->omap_chip)) + return ERR_PTR(-EINVAL); + + for (pd = deps; pd; pd++) { + + if (!omap_chip_is(pd->omap_chip)) + continue; + + if (!pd->pwrdm && pd->pwrdm_name) + pd->pwrdm = pwrdm_lookup(pd->pwrdm_name); + + if (pd->pwrdm == pwrdm) + break; + + } + + if (!pd) + return ERR_PTR(-ENOENT); + + return pd->pwrdm; +} + + +/* Public functions */ + +/** + * pwrdm_init - set up the powerdomain layer + * + * Loop through the list of powerdomains, registering all that are + * available on the current CPU. If pwrdm_list is supplied and not + * null, all of the referenced powerdomains will be registered. No + * return value. + */ +void pwrdm_init(struct powerdomain **pwrdm_list) +{ + struct powerdomain **p = NULL; + + if (pwrdm_list) + for (p = pwrdm_list; *p; p++) + pwrdm_register(*p); +} + +/** + * pwrdm_register - register a powerdomain + * @pwrdm: struct powerdomain * to register + * + * Adds a powerdomain to the internal powerdomain list. Returns + * -EINVAL if given a null pointer, -EEXIST if a powerdomain is + * already registered by the provided name, or 0 upon success. + */ +int pwrdm_register(struct powerdomain *pwrdm) +{ + unsigned long flags; + int ret = -EINVAL; + + if (!pwrdm) + return -EINVAL; + + if (!omap_chip_is(pwrdm->omap_chip)) + return -EINVAL; + + write_lock_irqsave(&pwrdm_rwlock, flags); + if (_pwrdm_lookup(pwrdm->name)) { + ret = -EEXIST; + goto pr_unlock; + } + + list_add(&pwrdm->node, &pwrdm_list); + + pr_debug("powerdomain: registered %s\n", pwrdm->name); + ret = 0; + +pr_unlock: + write_unlock_irqrestore(&pwrdm_rwlock, flags); + + return ret; +} + +/** + * pwrdm_unregister - unregister a powerdomain + * @pwrdm: struct powerdomain * to unregister + * + * Removes a powerdomain from the internal powerdomain list. Returns + * -EINVAL if pwrdm argument is NULL. + */ +int pwrdm_unregister(struct powerdomain *pwrdm) +{ + unsigned long flags; + + if (!pwrdm) + return -EINVAL; + + write_lock_irqsave(&pwrdm_rwlock, flags); + list_del(&pwrdm->node); + write_unlock_irqrestore(&pwrdm_rwlock, flags); + + pr_debug("powerdomain: unregistered %s\n", pwrdm->name); + + return 0; +} + +/** + * pwrdm_lookup - look up a powerdomain by name, return a pointer + * @name: name of powerdomain + * + * Find a registered powerdomain by its name. Returns a pointer to the + * struct powerdomain if found, or NULL otherwise. + */ +struct powerdomain *pwrdm_lookup(const char *name) +{ + struct powerdomain *pwrdm; + unsigned long flags; + + if (!name) + return NULL; + + read_lock_irqsave(&pwrdm_rwlock, flags); + pwrdm = _pwrdm_lookup(name); + read_unlock_irqrestore(&pwrdm_rwlock, flags); + + return pwrdm; +} + +/** + * pwrdm_for_each - call function on each registered clockdomain + * @fn: callback function * + * + * Call the supplied function for each registered powerdomain. The + * callback function can return anything but 0 to bail out early from + * the iterator. The callback function is called with the pwrdm_rwlock + * held for reading, so no powerdomain structure manipulation + * functions should be called from the callback, although hardware + * powerdomain control functions are fine. Returns the last return + * value of the callback function, which should be 0 for success or + * anything else to indicate failure; or -EINVAL if the function + * pointer is null. + */ +int pwrdm_for_each(int (*fn)(struct powerdomain *pwrdm)) +{ + struct powerdomain *temp_pwrdm; + unsigned long flags; + int ret = 0; + + if (!fn) + return -EINVAL; + + read_lock_irqsave(&pwrdm_rwlock, flags); + list_for_each_entry(temp_pwrdm, &pwrdm_list, node) { + ret = (*fn)(temp_pwrdm); + if (ret) + break; + } + read_unlock_irqrestore(&pwrdm_rwlock, flags); + + return ret; +} + +/** + * pwrdm_add_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_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; +} + + |
