diff options
Diffstat (limited to 'ANDROID_3.4.5/arch/arm/mach-omap2/clockdomain.c')
| -rw-r--r-- | ANDROID_3.4.5/arch/arm/mach-omap2/clockdomain.c | 1076 |
1 files changed, 0 insertions, 1076 deletions
diff --git a/ANDROID_3.4.5/arch/arm/mach-omap2/clockdomain.c b/ANDROID_3.4.5/arch/arm/mach-omap2/clockdomain.c deleted file mode 100644 index ad07689e..00000000 --- a/ANDROID_3.4.5/arch/arm/mach-omap2/clockdomain.c +++ /dev/null @@ -1,1076 +0,0 @@ -/* - * OMAP2/3/4 clockdomain framework functions - * - * Copyright (C) 2008-2011 Texas Instruments, Inc. - * Copyright (C) 2008-2011 Nokia Corporation - * - * Written by Paul Walmsley and Jouni Högander - * Added OMAP4 specific support by Abhijit Pagare <abhijitpagare@ti.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/device.h> -#include <linux/list.h> -#include <linux/errno.h> -#include <linux/string.h> -#include <linux/delay.h> -#include <linux/clk.h> -#include <linux/limits.h> -#include <linux/err.h> - -#include <linux/io.h> - -#include <linux/bitops.h> - -#include <plat/clock.h> -#include "clockdomain.h" - -/* clkdm_list contains all registered struct clockdomains */ -static LIST_HEAD(clkdm_list); - -/* array of clockdomain deps to be added/removed when clkdm in hwsup mode */ -static struct clkdm_autodep *autodeps; - -static struct clkdm_ops *arch_clkdm; - -/* Private functions */ - -static struct clockdomain *_clkdm_lookup(const char *name) -{ - struct clockdomain *clkdm, *temp_clkdm; - - if (!name) - return NULL; - - clkdm = NULL; - - list_for_each_entry(temp_clkdm, &clkdm_list, node) { - if (!strcmp(name, temp_clkdm->name)) { - clkdm = temp_clkdm; - break; - } - } - - return clkdm; -} - -/** - * _clkdm_register - register a clockdomain - * @clkdm: struct clockdomain * to register - * - * Adds a clockdomain to the internal clockdomain list. - * Returns -EINVAL if given a null pointer, -EEXIST if a clockdomain is - * already registered by the provided name, or 0 upon success. - */ -static int _clkdm_register(struct clockdomain *clkdm) -{ - struct powerdomain *pwrdm; - - if (!clkdm || !clkdm->name) - return -EINVAL; - - pwrdm = pwrdm_lookup(clkdm->pwrdm.name); - if (!pwrdm) { - pr_err("clockdomain: %s: powerdomain %s does not exist\n", - clkdm->name, clkdm->pwrdm.name); - return -EINVAL; - } - clkdm->pwrdm.ptr = pwrdm; - - /* Verify that the clockdomain is not already registered */ - if (_clkdm_lookup(clkdm->name)) - return -EEXIST; - - list_add(&clkdm->node, &clkdm_list); - - pwrdm_add_clkdm(pwrdm, clkdm); - - spin_lock_init(&clkdm->lock); - - pr_debug("clockdomain: registered %s\n", clkdm->name); - - return 0; -} - -/* _clkdm_deps_lookup - look up the specified clockdomain in a clkdm list */ -static struct clkdm_dep *_clkdm_deps_lookup(struct clockdomain *clkdm, - struct clkdm_dep *deps) -{ - struct clkdm_dep *cd; - - if (!clkdm || !deps) - return ERR_PTR(-EINVAL); - - for (cd = deps; cd->clkdm_name; cd++) { - if (!cd->clkdm && cd->clkdm_name) - cd->clkdm = _clkdm_lookup(cd->clkdm_name); - - if (cd->clkdm == clkdm) - break; - } - - if (!cd->clkdm_name) - return ERR_PTR(-ENOENT); - - return cd; -} - -/* - * _autodep_lookup - resolve autodep clkdm names to clkdm pointers; store - * @autodep: struct clkdm_autodep * to resolve - * - * Resolve autodep clockdomain names to clockdomain pointers via - * clkdm_lookup() and store the pointers in the autodep structure. An - * "autodep" is a clockdomain sleep/wakeup dependency that is - * automatically added and removed whenever clocks in the associated - * clockdomain are enabled or disabled (respectively) when the - * clockdomain is in hardware-supervised mode. Meant to be called - * once at clockdomain layer initialization, since these should remain - * fixed for a particular architecture. No return value. - * - * XXX autodeps are deprecated and should be removed at the earliest - * opportunity - */ -static void _autodep_lookup(struct clkdm_autodep *autodep) -{ - struct clockdomain *clkdm; - - if (!autodep) - return; - - clkdm = clkdm_lookup(autodep->clkdm.name); - if (!clkdm) { - pr_err("clockdomain: autodeps: clockdomain %s does not exist\n", - autodep->clkdm.name); - clkdm = ERR_PTR(-ENOENT); - } - autodep->clkdm.ptr = clkdm; -} - -/* - * _clkdm_add_autodeps - add auto sleepdeps/wkdeps to clkdm upon clock enable - * @clkdm: struct clockdomain * - * - * Add the "autodep" sleep & wakeup dependencies to clockdomain 'clkdm' - * in hardware-supervised mode. Meant to be called from clock framework - * when a clock inside clockdomain 'clkdm' is enabled. No return value. - * - * XXX autodeps are deprecated and should be removed at the earliest - * opportunity - */ -void _clkdm_add_autodeps(struct clockdomain *clkdm) -{ - struct clkdm_autodep *autodep; - - if (!autodeps || clkdm->flags & CLKDM_NO_AUTODEPS) - return; - - for (autodep = autodeps; autodep->clkdm.ptr; autodep++) { - if (IS_ERR(autodep->clkdm.ptr)) - continue; - - pr_debug("clockdomain: adding %s sleepdep/wkdep for " - "clkdm %s\n", autodep->clkdm.ptr->name, - clkdm->name); - - clkdm_add_sleepdep(clkdm, autodep->clkdm.ptr); - clkdm_add_wkdep(clkdm, autodep->clkdm.ptr); - } -} - -/* - * _clkdm_add_autodeps - remove auto sleepdeps/wkdeps from clkdm - * @clkdm: struct clockdomain * - * - * Remove the "autodep" sleep & wakeup dependencies from clockdomain 'clkdm' - * in hardware-supervised mode. Meant to be called from clock framework - * when a clock inside clockdomain 'clkdm' is disabled. No return value. - * - * XXX autodeps are deprecated and should be removed at the earliest - * opportunity - */ -void _clkdm_del_autodeps(struct clockdomain *clkdm) -{ - struct clkdm_autodep *autodep; - - if (!autodeps || clkdm->flags & CLKDM_NO_AUTODEPS) - return; - - for (autodep = autodeps; autodep->clkdm.ptr; autodep++) { - if (IS_ERR(autodep->clkdm.ptr)) - continue; - - pr_debug("clockdomain: removing %s sleepdep/wkdep for " - "clkdm %s\n", autodep->clkdm.ptr->name, - clkdm->name); - - clkdm_del_sleepdep(clkdm, autodep->clkdm.ptr); - clkdm_del_wkdep(clkdm, autodep->clkdm.ptr); - } -} - -/** - * _resolve_clkdm_deps() - resolve clkdm_names in @clkdm_deps to clkdms - * @clkdm: clockdomain that we are resolving dependencies for - * @clkdm_deps: ptr to array of struct clkdm_deps to resolve - * - * Iterates through @clkdm_deps, looking up the struct clockdomain named by - * clkdm_name and storing the clockdomain pointer in the struct clkdm_dep. - * No return value. - */ -static void _resolve_clkdm_deps(struct clockdomain *clkdm, - struct clkdm_dep *clkdm_deps) -{ - struct clkdm_dep *cd; - - for (cd = clkdm_deps; cd && cd->clkdm_name; cd++) { - if (cd->clkdm) - continue; - cd->clkdm = _clkdm_lookup(cd->clkdm_name); - - WARN(!cd->clkdm, "clockdomain: %s: could not find clkdm %s while resolving dependencies - should never happen", - clkdm->name, cd->clkdm_name); - } -} - -/* Public functions */ - -/** - * clkdm_register_platform_funcs - register clockdomain implementation fns - * @co: func pointers for arch specific implementations - * - * Register the list of function pointers used to implement the - * clockdomain functions on different OMAP SoCs. Should be called - * before any other clkdm_register*() function. Returns -EINVAL if - * @co is null, -EEXIST if platform functions have already been - * registered, or 0 upon success. - */ -int clkdm_register_platform_funcs(struct clkdm_ops *co) -{ - if (!co) - return -EINVAL; - - if (arch_clkdm) - return -EEXIST; - - arch_clkdm = co; - - return 0; -}; - -/** - * clkdm_register_clkdms - register SoC clockdomains - * @cs: pointer to an array of struct clockdomain to register - * - * Register the clockdomains available on a particular OMAP SoC. Must - * be called after clkdm_register_platform_funcs(). May be called - * multiple times. Returns -EACCES if called before - * clkdm_register_platform_funcs(); -EINVAL if the argument @cs is - * null; or 0 upon success. - */ -int clkdm_register_clkdms(struct clockdomain **cs) -{ - struct clockdomain **c = NULL; - - if (!arch_clkdm) - return -EACCES; - - if (!cs) - return -EINVAL; - - for (c = cs; *c; c++) - _clkdm_register(*c); - - return 0; -} - -/** - * clkdm_register_autodeps - register autodeps (if required) - * @ia: pointer to a static array of struct clkdm_autodep to register - * - * Register clockdomain "automatic dependencies." These are - * clockdomain wakeup and sleep dependencies that are automatically - * added whenever the first clock inside a clockdomain is enabled, and - * removed whenever the last clock inside a clockdomain is disabled. - * These are currently only used on OMAP3 devices, and are deprecated, - * since they waste energy. However, until the OMAP2/3 IP block - * enable/disable sequence can be converted to match the OMAP4 - * sequence, they are needed. - * - * Must be called only after all of the SoC clockdomains are - * registered, since the function will resolve autodep clockdomain - * names into clockdomain pointers. - * - * The struct clkdm_autodep @ia array must be static, as this function - * does not copy the array elements. - * - * Returns -EACCES if called before any clockdomains have been - * registered, -EINVAL if called with a null @ia argument, -EEXIST if - * autodeps have already been registered, or 0 upon success. - */ -int clkdm_register_autodeps(struct clkdm_autodep *ia) -{ - struct clkdm_autodep *a = NULL; - - if (list_empty(&clkdm_list)) - return -EACCES; - - if (!ia) - return -EINVAL; - - if (autodeps) - return -EEXIST; - - autodeps = ia; - for (a = autodeps; a->clkdm.ptr; a++) - _autodep_lookup(a); - - return 0; -} - -/** - * clkdm_complete_init - set up the clockdomain layer - * - * Put all clockdomains into software-supervised mode; PM code should - * later enable hardware-supervised mode as appropriate. Must be - * called after clkdm_register_clkdms(). Returns -EACCES if called - * before clkdm_register_clkdms(), or 0 upon success. - */ -int clkdm_complete_init(void) -{ - struct clockdomain *clkdm; - - if (list_empty(&clkdm_list)) - return -EACCES; - - list_for_each_entry(clkdm, &clkdm_list, node) { - if (clkdm->flags & CLKDM_CAN_FORCE_WAKEUP) - clkdm_wakeup(clkdm); - else if (clkdm->flags & CLKDM_CAN_DISABLE_AUTO) - clkdm_deny_idle(clkdm); - - _resolve_clkdm_deps(clkdm, clkdm->wkdep_srcs); - clkdm_clear_all_wkdeps(clkdm); - - _resolve_clkdm_deps(clkdm, clkdm->sleepdep_srcs); - clkdm_clear_all_sleepdeps(clkdm); - } - - return 0; -} - -/** - * clkdm_lookup - look up a clockdomain by name, return a pointer - * @name: name of clockdomain - * - * Find a registered clockdomain by its name @name. Returns a pointer - * to the struct clockdomain if found, or NULL otherwise. - */ -struct clockdomain *clkdm_lookup(const char *name) -{ - struct clockdomain *clkdm, *temp_clkdm; - - if (!name) - return NULL; - - clkdm = NULL; - - list_for_each_entry(temp_clkdm, &clkdm_list, node) { - if (!strcmp(name, temp_clkdm->name)) { - clkdm = temp_clkdm; - break; - } - } - - return clkdm; -} - -/** - * clkdm_for_each - call function on each registered clockdomain - * @fn: callback function * - * - * Call the supplied function @fn for each registered clockdomain. - * The callback function @fn can return anything but 0 to bail - * out early from the iterator. The callback function is called with - * the clkdm_mutex held, so no clockdomain structure manipulation - * functions should be called from the callback, although hardware - * clockdomain 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 clkdm_for_each(int (*fn)(struct clockdomain *clkdm, void *user), - void *user) -{ - struct clockdomain *clkdm; - int ret = 0; - - if (!fn) - return -EINVAL; - - list_for_each_entry(clkdm, &clkdm_list, node) { - ret = (*fn)(clkdm, user); - if (ret) - break; - } - - return ret; -} - - -/** - * clkdm_get_pwrdm - return a ptr to the pwrdm that this clkdm resides in - * @clkdm: struct clockdomain * - * - * Return a pointer to the struct powerdomain that the specified clockdomain - * @clkdm exists in, or returns NULL if @clkdm is NULL. - */ -struct powerdomain *clkdm_get_pwrdm(struct clockdomain *clkdm) -{ - if (!clkdm) - return NULL; - - return clkdm->pwrdm.ptr; -} - - -/* Hardware clockdomain control */ - -/** - * clkdm_add_wkdep - add a wakeup dependency from clkdm2 to clkdm1 - * @clkdm1: wake this struct clockdomain * up (dependent) - * @clkdm2: when this struct clockdomain * wakes up (source) - * - * When the clockdomain represented by @clkdm2 wakes up, wake up - * @clkdm1. Implemented in hardware on the OMAP, this feature is - * designed to reduce wakeup latency of the dependent clockdomain @clkdm1. - * Returns -EINVAL if presented with invalid clockdomain pointers, - * -ENOENT if @clkdm2 cannot wake up clkdm1 in hardware, or 0 upon - * success. - */ -int clkdm_add_wkdep(struct clockdomain *clkdm1, struct clockdomain *clkdm2) -{ - struct clkdm_dep *cd; - int ret = 0; - - if (!clkdm1 || !clkdm2) - return -EINVAL; - - cd = _clkdm_deps_lookup(clkdm2, clkdm1->wkdep_srcs); - if (IS_ERR(cd)) - ret = PTR_ERR(cd); - - if (!arch_clkdm || !arch_clkdm->clkdm_add_wkdep) - ret = -EINVAL; - - if (ret) { - pr_debug("clockdomain: hardware cannot set/clear wake up of " - "%s when %s wakes up\n", clkdm1->name, clkdm2->name); - return ret; - } - - if (atomic_inc_return(&cd->wkdep_usecount) == 1) { - pr_debug("clockdomain: hardware will wake up %s when %s wakes " - "up\n", clkdm1->name, clkdm2->name); - - ret = arch_clkdm->clkdm_add_wkdep(clkdm1, clkdm2); - } - - return ret; -} - -/** - * clkdm_del_wkdep - remove a wakeup dependency from clkdm2 to clkdm1 - * @clkdm1: wake this struct clockdomain * up (dependent) - * @clkdm2: when this struct clockdomain * wakes up (source) - * - * Remove a wakeup dependency causing @clkdm1 to wake up when @clkdm2 - * wakes up. Returns -EINVAL if presented with invalid clockdomain - * pointers, -ENOENT if @clkdm2 cannot wake up clkdm1 in hardware, or - * 0 upon success. - */ -int clkdm_del_wkdep(struct clockdomain *clkdm1, struct clockdomain *clkdm2) -{ - struct clkdm_dep *cd; - int ret = 0; - - if (!clkdm1 || !clkdm2) - return -EINVAL; - - cd = _clkdm_deps_lookup(clkdm2, clkdm1->wkdep_srcs); - if (IS_ERR(cd)) - ret = PTR_ERR(cd); - - if (!arch_clkdm || !arch_clkdm->clkdm_del_wkdep) - ret = -EINVAL; - - if (ret) { - pr_debug("clockdomain: hardware cannot set/clear wake up of " - "%s when %s wakes up\n", clkdm1->name, clkdm2->name); - return ret; - } - - if (atomic_dec_return(&cd->wkdep_usecount) == 0) { - pr_debug("clockdomain: hardware will no longer wake up %s " - "after %s wakes up\n", clkdm1->name, clkdm2->name); - - ret = arch_clkdm->clkdm_del_wkdep(clkdm1, clkdm2); - } - - return ret; -} - -/** - * clkdm_read_wkdep - read wakeup dependency state from clkdm2 to clkdm1 - * @clkdm1: wake this struct clockdomain * up (dependent) - * @clkdm2: when this struct clockdomain * wakes up (source) - * - * Return 1 if a hardware wakeup dependency exists wherein @clkdm1 will be - * awoken when @clkdm2 wakes up; 0 if dependency is not set; -EINVAL - * if either clockdomain 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 clkdm_read_wkdep(struct clockdomain *clkdm1, struct clockdomain *clkdm2) -{ - struct clkdm_dep *cd; - int ret = 0; - - if (!clkdm1 || !clkdm2) - return -EINVAL; - - cd = _clkdm_deps_lookup(clkdm2, clkdm1->wkdep_srcs); - if (IS_ERR(cd)) - ret = PTR_ERR(cd); - - if (!arch_clkdm || !arch_clkdm->clkdm_read_wkdep) - ret = -EINVAL; - - if (ret) { - pr_debug("clockdomain: hardware cannot set/clear wake up of " - "%s when %s wakes up\n", clkdm1->name, clkdm2->name); - return ret; - } - - /* XXX It's faster to return the atomic wkdep_usecount */ - return arch_clkdm->clkdm_read_wkdep(clkdm1, clkdm2); -} - -/** - * clkdm_clear_all_wkdeps - remove all wakeup dependencies from target clkdm - * @clkdm: struct clockdomain * to remove all wakeup dependencies from - * - * Remove all inter-clockdomain wakeup dependencies that could cause - * @clkdm to wake. Intended to be used during boot to initialize the - * PRCM to a known state, after all clockdomains are put into swsup idle - * and woken up. Returns -EINVAL if @clkdm pointer is invalid, or - * 0 upon success. - */ -int clkdm_clear_all_wkdeps(struct clockdomain *clkdm) -{ - if (!clkdm) - return -EINVAL; - - if (!arch_clkdm || !arch_clkdm->clkdm_clear_all_wkdeps) - return -EINVAL; - - return arch_clkdm->clkdm_clear_all_wkdeps(clkdm); -} - -/** - * clkdm_add_sleepdep - add a sleep dependency from clkdm2 to clkdm1 - * @clkdm1: prevent this struct clockdomain * from sleeping (dependent) - * @clkdm2: when this struct clockdomain * is active (source) - * - * Prevent @clkdm1 from automatically going inactive (and then to - * retention or off) if @clkdm2 is active. Returns -EINVAL if - * presented with invalid clockdomain 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 clkdm_add_sleepdep(struct clockdomain *clkdm1, struct clockdomain *clkdm2) -{ - struct clkdm_dep *cd; - int ret = 0; - - if (!clkdm1 || !clkdm2) - return -EINVAL; - - cd = _clkdm_deps_lookup(clkdm2, clkdm1->sleepdep_srcs); - if (IS_ERR(cd)) - ret = PTR_ERR(cd); - - if (!arch_clkdm || !arch_clkdm->clkdm_add_sleepdep) - ret = -EINVAL; - - if (ret) { - pr_debug("clockdomain: hardware cannot set/clear sleep " - "dependency affecting %s from %s\n", clkdm1->name, - clkdm2->name); - return ret; - } - - if (atomic_inc_return(&cd->sleepdep_usecount) == 1) { - pr_debug("clockdomain: will prevent %s from sleeping if %s " - "is active\n", clkdm1->name, clkdm2->name); - - ret = arch_clkdm->clkdm_add_sleepdep(clkdm1, clkdm2); - } - - return ret; -} - -/** - * clkdm_del_sleepdep - remove a sleep dependency from clkdm2 to clkdm1 - * @clkdm1: prevent this struct clockdomain * from sleeping (dependent) - * @clkdm2: when this struct clockdomain * is active (source) - * - * Allow @clkdm1 to automatically go inactive (and then to retention or - * off), independent of the activity state of @clkdm2. Returns -EINVAL - * if presented with invalid clockdomain 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 clkdm_del_sleepdep(struct clockdomain *clkdm1, struct clockdomain *clkdm2) -{ - struct clkdm_dep *cd; - int ret = 0; - - if (!clkdm1 || !clkdm2) - return -EINVAL; - - cd = _clkdm_deps_lookup(clkdm2, clkdm1->sleepdep_srcs); - if (IS_ERR(cd)) - ret = PTR_ERR(cd); - - if (!arch_clkdm || !arch_clkdm->clkdm_del_sleepdep) - ret = -EINVAL; - - if (ret) { - pr_debug("clockdomain: hardware cannot set/clear sleep " - "dependency affecting %s from %s\n", clkdm1->name, - clkdm2->name); - return ret; - } - - if (atomic_dec_return(&cd->sleepdep_usecount) == 0) { - pr_debug("clockdomain: will no longer prevent %s from " - "sleeping if %s is active\n", clkdm1->name, - clkdm2->name); - - ret = arch_clkdm->clkdm_del_sleepdep(clkdm1, clkdm2); - } - - return ret; -} - -/** - * clkdm_read_sleepdep - read sleep dependency state from clkdm2 to clkdm1 - * @clkdm1: prevent this struct clockdomain * from sleeping (dependent) - * @clkdm2: when this struct clockdomain * is active (source) - * - * Return 1 if a hardware sleep dependency exists wherein @clkdm1 will - * not be allowed to automatically go inactive if @clkdm2 is active; - * 0 if @clkdm1's automatic power state inactivity transition is independent - * of @clkdm2's; -EINVAL if either clockdomain 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 clkdm_read_sleepdep(struct clockdomain *clkdm1, struct clockdomain *clkdm2) -{ - struct clkdm_dep *cd; - int ret = 0; - - if (!clkdm1 || !clkdm2) - return -EINVAL; - - cd = _clkdm_deps_lookup(clkdm2, clkdm1->sleepdep_srcs); - if (IS_ERR(cd)) - ret = PTR_ERR(cd); - - if (!arch_clkdm || !arch_clkdm->clkdm_read_sleepdep) - ret = -EINVAL; - - if (ret) { - pr_debug("clockdomain: hardware cannot set/clear sleep " - "dependency affecting %s from %s\n", clkdm1->name, - clkdm2->name); - return ret; - } - - /* XXX It's faster to return the atomic sleepdep_usecount */ - return arch_clkdm->clkdm_read_sleepdep(clkdm1, clkdm2); -} - -/** - * clkdm_clear_all_sleepdeps - remove all sleep dependencies from target clkdm - * @clkdm: struct clockdomain * to remove all sleep dependencies from - * - * Remove all inter-clockdomain sleep dependencies that could prevent - * @clkdm from idling. Intended to be used during boot to initialize the - * PRCM to a known state, after all clockdomains are put into swsup idle - * and woken up. Returns -EINVAL if @clkdm pointer is invalid, or - * 0 upon success. - */ -int clkdm_clear_all_sleepdeps(struct clockdomain *clkdm) -{ - if (!clkdm) - return -EINVAL; - - if (!arch_clkdm || !arch_clkdm->clkdm_clear_all_sleepdeps) - return -EINVAL; - - return arch_clkdm->clkdm_clear_all_sleepdeps(clkdm); -} - -/** - * clkdm_sleep - force clockdomain sleep transition - * @clkdm: struct clockdomain * - * - * Instruct the CM to force a sleep transition on the specified - * clockdomain @clkdm. Returns -EINVAL if @clkdm is NULL or if - * clockdomain does not support software-initiated sleep; 0 upon - * success. - */ -int clkdm_sleep(struct clockdomain *clkdm) -{ - int ret; - unsigned long flags; - - if (!clkdm) - return -EINVAL; - - if (!(clkdm->flags & CLKDM_CAN_FORCE_SLEEP)) { - pr_debug("clockdomain: %s does not support forcing " - "sleep via software\n", clkdm->name); - return -EINVAL; - } - - if (!arch_clkdm || !arch_clkdm->clkdm_sleep) - return -EINVAL; - - pr_debug("clockdomain: forcing sleep on %s\n", clkdm->name); - - spin_lock_irqsave(&clkdm->lock, flags); - clkdm->_flags &= ~_CLKDM_FLAG_HWSUP_ENABLED; - ret = arch_clkdm->clkdm_sleep(clkdm); - spin_unlock_irqrestore(&clkdm->lock, flags); - return ret; -} - -/** - * clkdm_wakeup - force clockdomain wakeup transition - * @clkdm: struct clockdomain * - * - * Instruct the CM to force a wakeup transition on the specified - * clockdomain @clkdm. Returns -EINVAL if @clkdm is NULL or if the - * clockdomain does not support software-controlled wakeup; 0 upon - * success. - */ -int clkdm_wakeup(struct clockdomain *clkdm) -{ - int ret; - unsigned long flags; - - if (!clkdm) - return -EINVAL; - - if (!(clkdm->flags & CLKDM_CAN_FORCE_WAKEUP)) { - pr_debug("clockdomain: %s does not support forcing " - "wakeup via software\n", clkdm->name); - return -EINVAL; - } - - if (!arch_clkdm || !arch_clkdm->clkdm_wakeup) - return -EINVAL; - - pr_debug("clockdomain: forcing wakeup on %s\n", clkdm->name); - - spin_lock_irqsave(&clkdm->lock, flags); - clkdm->_flags &= ~_CLKDM_FLAG_HWSUP_ENABLED; - ret = arch_clkdm->clkdm_wakeup(clkdm); - ret |= pwrdm_state_switch(clkdm->pwrdm.ptr); - spin_unlock_irqrestore(&clkdm->lock, flags); - return ret; -} - -/** - * clkdm_allow_idle - enable hwsup idle transitions for clkdm - * @clkdm: struct clockdomain * - * - * Allow the hardware to automatically switch the clockdomain @clkdm into - * active or idle states, as needed by downstream clocks. If the - * clockdomain has any downstream clocks enabled in the clock - * framework, wkdep/sleepdep autodependencies are added; this is so - * device drivers can read and write to the device. No return value. - */ -void clkdm_allow_idle(struct clockdomain *clkdm) -{ - unsigned long flags; - - if (!clkdm) - return; - - if (!(clkdm->flags & CLKDM_CAN_ENABLE_AUTO)) { - pr_debug("clock: automatic idle transitions cannot be enabled " - "on clockdomain %s\n", clkdm->name); - return; - } - - if (!arch_clkdm || !arch_clkdm->clkdm_allow_idle) - return; - - pr_debug("clockdomain: enabling automatic idle transitions for %s\n", - clkdm->name); - - spin_lock_irqsave(&clkdm->lock, flags); - clkdm->_flags |= _CLKDM_FLAG_HWSUP_ENABLED; - arch_clkdm->clkdm_allow_idle(clkdm); - pwrdm_clkdm_state_switch(clkdm); - spin_unlock_irqrestore(&clkdm->lock, flags); -} - -/** - * clkdm_deny_idle - disable hwsup idle transitions for clkdm - * @clkdm: struct clockdomain * - * - * Prevent the hardware from automatically switching the clockdomain - * @clkdm into inactive or idle states. If the clockdomain has - * downstream clocks enabled in the clock framework, wkdep/sleepdep - * autodependencies are removed. No return value. - */ -void clkdm_deny_idle(struct clockdomain *clkdm) -{ - unsigned long flags; - - if (!clkdm) - return; - - if (!(clkdm->flags & CLKDM_CAN_DISABLE_AUTO)) { - pr_debug("clockdomain: automatic idle transitions cannot be " - "disabled on %s\n", clkdm->name); - return; - } - - if (!arch_clkdm || !arch_clkdm->clkdm_deny_idle) - return; - - pr_debug("clockdomain: disabling automatic idle transitions for %s\n", - clkdm->name); - - spin_lock_irqsave(&clkdm->lock, flags); - clkdm->_flags &= ~_CLKDM_FLAG_HWSUP_ENABLED; - arch_clkdm->clkdm_deny_idle(clkdm); - pwrdm_state_switch(clkdm->pwrdm.ptr); - spin_unlock_irqrestore(&clkdm->lock, flags); -} - -/** - * clkdm_in_hwsup - is clockdomain @clkdm have hardware-supervised idle enabled? - * @clkdm: struct clockdomain * - * - * Returns true if clockdomain @clkdm currently has - * hardware-supervised idle enabled, or false if it does not or if - * @clkdm is NULL. It is only valid to call this function after - * clkdm_init() has been called. This function does not actually read - * bits from the hardware; it instead tests an in-memory flag that is - * changed whenever the clockdomain code changes the auto-idle mode. - */ -bool clkdm_in_hwsup(struct clockdomain *clkdm) -{ - bool ret; - unsigned long flags; - - if (!clkdm) - return false; - - spin_lock_irqsave(&clkdm->lock, flags); - ret = (clkdm->_flags & _CLKDM_FLAG_HWSUP_ENABLED) ? true : false; - spin_unlock_irqrestore(&clkdm->lock, flags); - - return ret; -} - -/* Clockdomain-to-clock/hwmod framework interface code */ - -static int _clkdm_clk_hwmod_enable(struct clockdomain *clkdm) -{ - unsigned long flags; - - if (!clkdm || !arch_clkdm || !arch_clkdm->clkdm_clk_enable) - return -EINVAL; - - /* - * For arch's with no autodeps, clkcm_clk_enable - * should be called for every clock instance or hwmod that is - * enabled, so the clkdm can be force woken up. - */ - if ((atomic_inc_return(&clkdm->usecount) > 1) && autodeps) - return 0; - - spin_lock_irqsave(&clkdm->lock, flags); - arch_clkdm->clkdm_clk_enable(clkdm); - pwrdm_wait_transition(clkdm->pwrdm.ptr); - pwrdm_clkdm_state_switch(clkdm); - spin_unlock_irqrestore(&clkdm->lock, flags); - - pr_debug("clockdomain: clkdm %s: enabled\n", clkdm->name); - - return 0; -} - -static int _clkdm_clk_hwmod_disable(struct clockdomain *clkdm) -{ - unsigned long flags; - - if (!clkdm || !arch_clkdm || !arch_clkdm->clkdm_clk_disable) - return -EINVAL; - - if (atomic_read(&clkdm->usecount) == 0) { - WARN_ON(1); /* underflow */ - return -ERANGE; - } - - if (atomic_dec_return(&clkdm->usecount) > 0) - return 0; - - spin_lock_irqsave(&clkdm->lock, flags); - arch_clkdm->clkdm_clk_disable(clkdm); - pwrdm_clkdm_state_switch(clkdm); - spin_unlock_irqrestore(&clkdm->lock, flags); - - pr_debug("clockdomain: clkdm %s: disabled\n", clkdm->name); - - return 0; -} - -/** - * clkdm_clk_enable - add an enabled downstream clock to this clkdm - * @clkdm: struct clockdomain * - * @clk: struct clk * of the enabled downstream clock - * - * Increment the usecount of the clockdomain @clkdm and ensure that it - * is awake before @clk is enabled. Intended to be called by - * clk_enable() code. If the clockdomain is in software-supervised - * idle mode, force the clockdomain to wake. If the clockdomain is in - * hardware-supervised idle mode, add clkdm-pwrdm autodependencies, to - * ensure that devices in the clockdomain can be read from/written to - * by on-chip processors. Returns -EINVAL if passed null pointers; - * returns 0 upon success or if the clockdomain is in hwsup idle mode. - */ -int clkdm_clk_enable(struct clockdomain *clkdm, struct clk *clk) -{ - /* - * XXX Rewrite this code to maintain a list of enabled - * downstream clocks for debugging purposes? - */ - - if (!clk) - return -EINVAL; - - return _clkdm_clk_hwmod_enable(clkdm); -} - -/** - * clkdm_clk_disable - remove an enabled downstream clock from this clkdm - * @clkdm: struct clockdomain * - * @clk: struct clk * of the disabled downstream clock - * - * Decrement the usecount of this clockdomain @clkdm when @clk is - * disabled. Intended to be called by clk_disable() code. If the - * clockdomain usecount goes to 0, put the clockdomain to sleep - * (software-supervised mode) or remove the clkdm autodependencies - * (hardware-supervised mode). Returns -EINVAL if passed null - * pointers; -ERANGE if the @clkdm usecount underflows; or returns 0 - * upon success or if the clockdomain is in hwsup idle mode. - */ -int clkdm_clk_disable(struct clockdomain *clkdm, struct clk *clk) -{ - /* - * XXX Rewrite this code to maintain a list of enabled - * downstream clocks for debugging purposes? - */ - - if (!clk) - return -EINVAL; - - return _clkdm_clk_hwmod_disable(clkdm); -} - -/** - * clkdm_hwmod_enable - add an enabled downstream hwmod to this clkdm - * @clkdm: struct clockdomain * - * @oh: struct omap_hwmod * of the enabled downstream hwmod - * - * Increment the usecount of the clockdomain @clkdm and ensure that it - * is awake before @oh is enabled. Intended to be called by - * module_enable() code. - * If the clockdomain is in software-supervised idle mode, force the - * clockdomain to wake. If the clockdomain is in hardware-supervised idle - * mode, add clkdm-pwrdm autodependencies, to ensure that devices in the - * clockdomain can be read from/written to by on-chip processors. - * Returns -EINVAL if passed null pointers; - * returns 0 upon success or if the clockdomain is in hwsup idle mode. - */ -int clkdm_hwmod_enable(struct clockdomain *clkdm, struct omap_hwmod *oh) -{ - /* The clkdm attribute does not exist yet prior OMAP4 */ - if (cpu_is_omap24xx() || cpu_is_omap34xx()) - return 0; - - /* - * XXX Rewrite this code to maintain a list of enabled - * downstream hwmods for debugging purposes? - */ - - if (!oh) - return -EINVAL; - - return _clkdm_clk_hwmod_enable(clkdm); -} - -/** - * clkdm_hwmod_disable - remove an enabled downstream hwmod from this clkdm - * @clkdm: struct clockdomain * - * @oh: struct omap_hwmod * of the disabled downstream hwmod - * - * Decrement the usecount of this clockdomain @clkdm when @oh is - * disabled. Intended to be called by module_disable() code. - * If the clockdomain usecount goes to 0, put the clockdomain to sleep - * (software-supervised mode) or remove the clkdm autodependencies - * (hardware-supervised mode). - * Returns -EINVAL if passed null pointers; -ERANGE if the @clkdm usecount - * underflows; or returns 0 upon success or if the clockdomain is in hwsup - * idle mode. - */ -int clkdm_hwmod_disable(struct clockdomain *clkdm, struct omap_hwmod *oh) -{ - /* The clkdm attribute does not exist yet prior OMAP4 */ - if (cpu_is_omap24xx() || cpu_is_omap34xx()) - return 0; - - /* - * XXX Rewrite this code to maintain a list of enabled - * downstream hwmods for debugging purposes? - */ - - if (!oh) - return -EINVAL; - - return _clkdm_clk_hwmod_disable(clkdm); -} - |