b1cbdb00da
While using clockdomain force wakeup method, not waiting for powerdomain to be effectively ON may end up locking the clockdomain FSM until a next wakeup event occurs. One such issue was seen on OMAP4430, where L4_PER was periodically getting stuck in in-transition state when transitioning from from OSWR to ON. This issue was reported and investigated by Patrick Titiano <p-titiano@ti.com> Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com> Signed-off-by: Rajendra Nayak <rnayak@ti.com> Reported-by: Patrick Titiano <p-titiano@ti.com> Cc: Kevin Hilman <khilman@ti.com> Cc: Benoit Cousson <b-cousson@ti.com> Cc: Paul Walmsley <paul@pwsan.com> [paul@pwsan.com: updated to apply; added transition wait on clkdm_deny_idle(); remove two superfluous pwrdm_wait_transition() calls] Signed-off-by: Paul Walmsley <paul@pwsan.com>
1020 lines
29 KiB
C
1020 lines
29 KiB
C
/*
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* OMAP2/3/4 clockdomain framework functions
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*
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* Copyright (C) 2008-2011 Texas Instruments, Inc.
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* Copyright (C) 2008-2011 Nokia Corporation
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*
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* Written by Paul Walmsley and Jouni Högander
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* Added OMAP4 specific support by Abhijit Pagare <abhijitpagare@ti.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#undef DEBUG
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#include <linux/kernel.h>
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#include <linux/device.h>
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#include <linux/list.h>
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#include <linux/errno.h>
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#include <linux/delay.h>
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#include <linux/clk.h>
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#include <linux/limits.h>
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#include <linux/err.h>
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#include <linux/io.h>
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#include <linux/bitops.h>
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#include <plat/clock.h>
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#include "clockdomain.h"
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/* clkdm_list contains all registered struct clockdomains */
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static LIST_HEAD(clkdm_list);
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/* array of clockdomain deps to be added/removed when clkdm in hwsup mode */
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static struct clkdm_autodep *autodeps;
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static struct clkdm_ops *arch_clkdm;
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/* Private functions */
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static struct clockdomain *_clkdm_lookup(const char *name)
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{
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struct clockdomain *clkdm, *temp_clkdm;
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if (!name)
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return NULL;
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clkdm = NULL;
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list_for_each_entry(temp_clkdm, &clkdm_list, node) {
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if (!strcmp(name, temp_clkdm->name)) {
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clkdm = temp_clkdm;
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break;
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}
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}
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return clkdm;
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}
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/**
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* _clkdm_register - register a clockdomain
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* @clkdm: struct clockdomain * to register
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*
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* Adds a clockdomain to the internal clockdomain list.
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* Returns -EINVAL if given a null pointer, -EEXIST if a clockdomain is
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* already registered by the provided name, or 0 upon success.
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*/
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static int _clkdm_register(struct clockdomain *clkdm)
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{
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struct powerdomain *pwrdm;
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if (!clkdm || !clkdm->name)
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return -EINVAL;
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if (!omap_chip_is(clkdm->omap_chip))
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return -EINVAL;
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pwrdm = pwrdm_lookup(clkdm->pwrdm.name);
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if (!pwrdm) {
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pr_err("clockdomain: %s: powerdomain %s does not exist\n",
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clkdm->name, clkdm->pwrdm.name);
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return -EINVAL;
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}
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clkdm->pwrdm.ptr = pwrdm;
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/* Verify that the clockdomain is not already registered */
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if (_clkdm_lookup(clkdm->name))
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return -EEXIST;
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list_add(&clkdm->node, &clkdm_list);
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pwrdm_add_clkdm(pwrdm, clkdm);
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spin_lock_init(&clkdm->lock);
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pr_debug("clockdomain: registered %s\n", clkdm->name);
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return 0;
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}
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/* _clkdm_deps_lookup - look up the specified clockdomain in a clkdm list */
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static struct clkdm_dep *_clkdm_deps_lookup(struct clockdomain *clkdm,
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struct clkdm_dep *deps)
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{
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struct clkdm_dep *cd;
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if (!clkdm || !deps || !omap_chip_is(clkdm->omap_chip))
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return ERR_PTR(-EINVAL);
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for (cd = deps; cd->clkdm_name; cd++) {
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if (!omap_chip_is(cd->omap_chip))
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continue;
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if (!cd->clkdm && cd->clkdm_name)
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cd->clkdm = _clkdm_lookup(cd->clkdm_name);
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if (cd->clkdm == clkdm)
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break;
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}
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if (!cd->clkdm_name)
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return ERR_PTR(-ENOENT);
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return cd;
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}
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/*
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* _autodep_lookup - resolve autodep clkdm names to clkdm pointers; store
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* @autodep: struct clkdm_autodep * to resolve
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*
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* Resolve autodep clockdomain names to clockdomain pointers via
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* clkdm_lookup() and store the pointers in the autodep structure. An
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* "autodep" is a clockdomain sleep/wakeup dependency that is
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* automatically added and removed whenever clocks in the associated
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* clockdomain are enabled or disabled (respectively) when the
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* clockdomain is in hardware-supervised mode. Meant to be called
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* once at clockdomain layer initialization, since these should remain
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* fixed for a particular architecture. No return value.
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*
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* XXX autodeps are deprecated and should be removed at the earliest
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* opportunity
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*/
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static void _autodep_lookup(struct clkdm_autodep *autodep)
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{
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struct clockdomain *clkdm;
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if (!autodep)
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return;
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if (!omap_chip_is(autodep->omap_chip))
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return;
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clkdm = clkdm_lookup(autodep->clkdm.name);
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if (!clkdm) {
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pr_err("clockdomain: autodeps: clockdomain %s does not exist\n",
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autodep->clkdm.name);
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clkdm = ERR_PTR(-ENOENT);
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}
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autodep->clkdm.ptr = clkdm;
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}
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/*
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* _clkdm_add_autodeps - add auto sleepdeps/wkdeps to clkdm upon clock enable
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* @clkdm: struct clockdomain *
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*
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* Add the "autodep" sleep & wakeup dependencies to clockdomain 'clkdm'
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* in hardware-supervised mode. Meant to be called from clock framework
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* when a clock inside clockdomain 'clkdm' is enabled. No return value.
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*
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* XXX autodeps are deprecated and should be removed at the earliest
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* opportunity
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*/
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void _clkdm_add_autodeps(struct clockdomain *clkdm)
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{
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struct clkdm_autodep *autodep;
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if (!autodeps || clkdm->flags & CLKDM_NO_AUTODEPS)
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return;
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for (autodep = autodeps; autodep->clkdm.ptr; autodep++) {
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if (IS_ERR(autodep->clkdm.ptr))
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continue;
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if (!omap_chip_is(autodep->omap_chip))
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continue;
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pr_debug("clockdomain: adding %s sleepdep/wkdep for "
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"clkdm %s\n", autodep->clkdm.ptr->name,
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clkdm->name);
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clkdm_add_sleepdep(clkdm, autodep->clkdm.ptr);
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clkdm_add_wkdep(clkdm, autodep->clkdm.ptr);
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}
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}
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/*
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* _clkdm_add_autodeps - remove auto sleepdeps/wkdeps from clkdm
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* @clkdm: struct clockdomain *
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*
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* Remove the "autodep" sleep & wakeup dependencies from clockdomain 'clkdm'
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* in hardware-supervised mode. Meant to be called from clock framework
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* when a clock inside clockdomain 'clkdm' is disabled. No return value.
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*
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* XXX autodeps are deprecated and should be removed at the earliest
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* opportunity
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*/
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void _clkdm_del_autodeps(struct clockdomain *clkdm)
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{
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struct clkdm_autodep *autodep;
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if (!autodeps || clkdm->flags & CLKDM_NO_AUTODEPS)
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return;
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for (autodep = autodeps; autodep->clkdm.ptr; autodep++) {
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if (IS_ERR(autodep->clkdm.ptr))
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continue;
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if (!omap_chip_is(autodep->omap_chip))
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continue;
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pr_debug("clockdomain: removing %s sleepdep/wkdep for "
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"clkdm %s\n", autodep->clkdm.ptr->name,
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clkdm->name);
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clkdm_del_sleepdep(clkdm, autodep->clkdm.ptr);
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clkdm_del_wkdep(clkdm, autodep->clkdm.ptr);
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}
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}
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/**
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* _resolve_clkdm_deps() - resolve clkdm_names in @clkdm_deps to clkdms
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* @clkdm: clockdomain that we are resolving dependencies for
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* @clkdm_deps: ptr to array of struct clkdm_deps to resolve
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*
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* Iterates through @clkdm_deps, looking up the struct clockdomain named by
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* clkdm_name and storing the clockdomain pointer in the struct clkdm_dep.
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* No return value.
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*/
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static void _resolve_clkdm_deps(struct clockdomain *clkdm,
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struct clkdm_dep *clkdm_deps)
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{
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struct clkdm_dep *cd;
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for (cd = clkdm_deps; cd && cd->clkdm_name; cd++) {
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if (!omap_chip_is(cd->omap_chip))
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continue;
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if (cd->clkdm)
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continue;
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cd->clkdm = _clkdm_lookup(cd->clkdm_name);
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WARN(!cd->clkdm, "clockdomain: %s: could not find clkdm %s while resolving dependencies - should never happen",
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clkdm->name, cd->clkdm_name);
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}
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}
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/* Public functions */
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/**
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* clkdm_init - set up the clockdomain layer
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* @clkdms: optional pointer to an array of clockdomains to register
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* @init_autodeps: optional pointer to an array of autodeps to register
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* @custom_funcs: func pointers for arch specific implementations
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*
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* Set up internal state. If a pointer to an array of clockdomains
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* @clkdms was supplied, loop through the list of clockdomains,
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* register all that are available on the current platform. Similarly,
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* if a pointer to an array of clockdomain autodependencies
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* @init_autodeps was provided, register those. No return value.
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*/
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void clkdm_init(struct clockdomain **clkdms,
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struct clkdm_autodep *init_autodeps,
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struct clkdm_ops *custom_funcs)
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{
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struct clockdomain **c = NULL;
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struct clockdomain *clkdm;
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struct clkdm_autodep *autodep = NULL;
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if (!custom_funcs)
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WARN(1, "No custom clkdm functions registered\n");
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else
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arch_clkdm = custom_funcs;
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if (clkdms)
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for (c = clkdms; *c; c++)
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_clkdm_register(*c);
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autodeps = init_autodeps;
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if (autodeps)
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for (autodep = autodeps; autodep->clkdm.ptr; autodep++)
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_autodep_lookup(autodep);
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/*
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* Put all clockdomains into software-supervised mode; PM code
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* should later enable hardware-supervised mode as appropriate
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*/
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list_for_each_entry(clkdm, &clkdm_list, node) {
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if (clkdm->flags & CLKDM_CAN_FORCE_WAKEUP)
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clkdm_wakeup(clkdm);
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else if (clkdm->flags & CLKDM_CAN_DISABLE_AUTO)
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clkdm_deny_idle(clkdm);
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_resolve_clkdm_deps(clkdm, clkdm->wkdep_srcs);
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clkdm_clear_all_wkdeps(clkdm);
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_resolve_clkdm_deps(clkdm, clkdm->sleepdep_srcs);
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clkdm_clear_all_sleepdeps(clkdm);
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}
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}
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/**
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* clkdm_lookup - look up a clockdomain by name, return a pointer
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* @name: name of clockdomain
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*
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* Find a registered clockdomain by its name @name. Returns a pointer
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* to the struct clockdomain if found, or NULL otherwise.
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*/
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struct clockdomain *clkdm_lookup(const char *name)
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{
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struct clockdomain *clkdm, *temp_clkdm;
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if (!name)
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return NULL;
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clkdm = NULL;
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list_for_each_entry(temp_clkdm, &clkdm_list, node) {
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if (!strcmp(name, temp_clkdm->name)) {
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clkdm = temp_clkdm;
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break;
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}
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}
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return clkdm;
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}
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/**
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* clkdm_for_each - call function on each registered clockdomain
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* @fn: callback function *
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*
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* Call the supplied function @fn for each registered clockdomain.
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* The callback function @fn can return anything but 0 to bail
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* out early from the iterator. The callback function is called with
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* the clkdm_mutex held, so no clockdomain structure manipulation
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* functions should be called from the callback, although hardware
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* clockdomain control functions are fine. Returns the last return
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* value of the callback function, which should be 0 for success or
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* anything else to indicate failure; or -EINVAL if the function pointer
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* is null.
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*/
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int clkdm_for_each(int (*fn)(struct clockdomain *clkdm, void *user),
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void *user)
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{
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struct clockdomain *clkdm;
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int ret = 0;
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if (!fn)
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return -EINVAL;
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list_for_each_entry(clkdm, &clkdm_list, node) {
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ret = (*fn)(clkdm, user);
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if (ret)
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break;
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}
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return ret;
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}
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/**
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* clkdm_get_pwrdm - return a ptr to the pwrdm that this clkdm resides in
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* @clkdm: struct clockdomain *
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*
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* Return a pointer to the struct powerdomain that the specified clockdomain
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* @clkdm exists in, or returns NULL if @clkdm is NULL.
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*/
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struct powerdomain *clkdm_get_pwrdm(struct clockdomain *clkdm)
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{
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if (!clkdm)
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return NULL;
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return clkdm->pwrdm.ptr;
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}
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/* Hardware clockdomain control */
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/**
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* clkdm_add_wkdep - add a wakeup dependency from clkdm2 to clkdm1
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* @clkdm1: wake this struct clockdomain * up (dependent)
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* @clkdm2: when this struct clockdomain * wakes up (source)
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*
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* When the clockdomain represented by @clkdm2 wakes up, wake up
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* @clkdm1. Implemented in hardware on the OMAP, this feature is
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* designed to reduce wakeup latency of the dependent clockdomain @clkdm1.
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* Returns -EINVAL if presented with invalid clockdomain pointers,
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* -ENOENT if @clkdm2 cannot wake up clkdm1 in hardware, or 0 upon
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* success.
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*/
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int clkdm_add_wkdep(struct clockdomain *clkdm1, struct clockdomain *clkdm2)
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{
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struct clkdm_dep *cd;
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int ret = 0;
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if (!clkdm1 || !clkdm2)
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return -EINVAL;
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cd = _clkdm_deps_lookup(clkdm2, clkdm1->wkdep_srcs);
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if (IS_ERR(cd))
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ret = PTR_ERR(cd);
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if (!arch_clkdm || !arch_clkdm->clkdm_add_wkdep)
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ret = -EINVAL;
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if (ret) {
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pr_debug("clockdomain: hardware cannot set/clear wake up of "
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"%s when %s wakes up\n", clkdm1->name, clkdm2->name);
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return ret;
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}
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if (atomic_inc_return(&cd->wkdep_usecount) == 1) {
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pr_debug("clockdomain: hardware will wake up %s when %s wakes "
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"up\n", clkdm1->name, clkdm2->name);
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ret = arch_clkdm->clkdm_add_wkdep(clkdm1, clkdm2);
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}
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return ret;
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}
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/**
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* clkdm_del_wkdep - remove a wakeup dependency from clkdm2 to clkdm1
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* @clkdm1: wake this struct clockdomain * up (dependent)
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* @clkdm2: when this struct clockdomain * wakes up (source)
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*
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* Remove a wakeup dependency causing @clkdm1 to wake up when @clkdm2
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* wakes up. Returns -EINVAL if presented with invalid clockdomain
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* pointers, -ENOENT if @clkdm2 cannot wake up clkdm1 in hardware, or
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* 0 upon success.
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*/
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int clkdm_del_wkdep(struct clockdomain *clkdm1, struct clockdomain *clkdm2)
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{
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struct clkdm_dep *cd;
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int ret = 0;
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if (!clkdm1 || !clkdm2)
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return -EINVAL;
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cd = _clkdm_deps_lookup(clkdm2, clkdm1->wkdep_srcs);
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if (IS_ERR(cd))
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ret = PTR_ERR(cd);
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if (!arch_clkdm || !arch_clkdm->clkdm_del_wkdep)
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ret = -EINVAL;
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if (ret) {
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pr_debug("clockdomain: hardware cannot set/clear wake up of "
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"%s when %s wakes up\n", clkdm1->name, clkdm2->name);
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return ret;
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}
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if (atomic_dec_return(&cd->wkdep_usecount) == 0) {
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pr_debug("clockdomain: hardware will no longer wake up %s "
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"after %s wakes up\n", clkdm1->name, clkdm2->name);
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ret = arch_clkdm->clkdm_del_wkdep(clkdm1, clkdm2);
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}
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return ret;
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}
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/**
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* clkdm_read_wkdep - read wakeup dependency state from clkdm2 to clkdm1
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* @clkdm1: wake this struct clockdomain * up (dependent)
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* @clkdm2: when this struct clockdomain * wakes up (source)
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*
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* Return 1 if a hardware wakeup dependency exists wherein @clkdm1 will be
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* awoken when @clkdm2 wakes up; 0 if dependency is not set; -EINVAL
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* if either clockdomain pointer is invalid; or -ENOENT if the hardware
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* is incapable.
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*
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* REVISIT: Currently this function only represents software-controllable
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* wakeup dependencies. Wakeup dependencies fixed in hardware are not
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* yet handled here.
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*/
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int clkdm_read_wkdep(struct clockdomain *clkdm1, struct clockdomain *clkdm2)
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{
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struct clkdm_dep *cd;
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int ret = 0;
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if (!clkdm1 || !clkdm2)
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return -EINVAL;
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cd = _clkdm_deps_lookup(clkdm2, clkdm1->wkdep_srcs);
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if (IS_ERR(cd))
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ret = PTR_ERR(cd);
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|
|
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);
|
|
}
|
|
|