1044 lines
29 KiB
C
1044 lines
29 KiB
C
/*
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* OMAP2/3/4 clockdomain framework functions
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*
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* Copyright (C) 2008-2009 Texas Instruments, Inc.
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* Copyright (C) 2008-2009 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/module.h>
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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 "prm.h"
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#include "prm-regbits-24xx.h"
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#include "cm.h"
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#include <plat/clock.h>
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#include <plat/powerdomain.h>
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#include <plat/clockdomain.h>
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#include <plat/prcm.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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/* 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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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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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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static void _clkdm_add_autodeps(struct clockdomain *clkdm)
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{
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struct clkdm_autodep *autodep;
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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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static void _clkdm_del_autodeps(struct clockdomain *clkdm)
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{
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struct clkdm_autodep *autodep;
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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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* _omap2_clkdm_set_hwsup - set the hwsup idle transition bit
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* @clkdm: struct clockdomain *
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* @enable: int 0 to disable, 1 to enable
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*
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* Internal helper for actually switching the bit that controls hwsup
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* idle transitions for clkdm.
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*/
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static void _omap2_clkdm_set_hwsup(struct clockdomain *clkdm, int enable)
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{
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u32 bits, v;
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if (cpu_is_omap24xx()) {
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if (enable)
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bits = OMAP24XX_CLKSTCTRL_ENABLE_AUTO;
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else
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bits = OMAP24XX_CLKSTCTRL_DISABLE_AUTO;
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} else if (cpu_is_omap34xx() | cpu_is_omap44xx()) {
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if (enable)
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bits = OMAP34XX_CLKSTCTRL_ENABLE_AUTO;
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else
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bits = OMAP34XX_CLKSTCTRL_DISABLE_AUTO;
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} else {
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BUG();
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}
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bits = bits << __ffs(clkdm->clktrctrl_mask);
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v = __raw_readl(clkdm->clkstctrl_reg);
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v &= ~(clkdm->clktrctrl_mask);
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v |= bits;
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__raw_writel(v, clkdm->clkstctrl_reg);
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}
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/**
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* _init_wkdep_usecount - initialize wkdep usecounts to match hardware
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* @clkdm: clockdomain to initialize wkdep usecounts
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*
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* Initialize the wakeup dependency usecount variables for clockdomain @clkdm.
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* If a wakeup dependency is present in the hardware, the usecount will be
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* set to 1; otherwise, it will be set to 0. Software should clear all
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* software wakeup dependencies prior to calling this function if it wishes
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* to ensure that all usecounts start at 0. No return value.
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*/
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static void _init_wkdep_usecount(struct clockdomain *clkdm)
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{
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u32 v;
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struct clkdm_dep *cd;
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if (!clkdm->wkdep_srcs)
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return;
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for (cd = clkdm->wkdep_srcs; 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) {
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WARN(!cd->clkdm, "clockdomain: %s: wkdep clkdm %s not "
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"found\n", clkdm->name, cd->clkdm_name);
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continue;
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}
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v = prm_read_mod_bits_shift(clkdm->pwrdm.ptr->prcm_offs,
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PM_WKDEP,
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(1 << cd->clkdm->dep_bit));
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if (v)
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pr_debug("clockdomain: %s: wakeup dependency already "
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"set to wake up when %s wakes\n",
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clkdm->name, cd->clkdm->name);
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atomic_set(&cd->wkdep_usecount, (v) ? 1 : 0);
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}
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}
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/**
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* _init_sleepdep_usecount - initialize sleepdep usecounts to match hardware
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* @clkdm: clockdomain to initialize sleepdep usecounts
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*
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* Initialize the sleep dependency usecount variables for clockdomain @clkdm.
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* If a sleep dependency is present in the hardware, the usecount will be
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* set to 1; otherwise, it will be set to 0. Software should clear all
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* software sleep dependencies prior to calling this function if it wishes
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* to ensure that all usecounts start at 0. No return value.
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*/
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static void _init_sleepdep_usecount(struct clockdomain *clkdm)
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{
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u32 v;
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struct clkdm_dep *cd;
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if (!cpu_is_omap34xx())
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return;
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if (!clkdm->sleepdep_srcs)
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return;
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for (cd = clkdm->sleepdep_srcs; 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) {
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WARN(!cd->clkdm, "clockdomain: %s: sleepdep clkdm %s "
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"not found\n", clkdm->name, cd->clkdm_name);
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continue;
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}
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v = prm_read_mod_bits_shift(clkdm->pwrdm.ptr->prcm_offs,
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OMAP3430_CM_SLEEPDEP,
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(1 << cd->clkdm->dep_bit));
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if (v)
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pr_debug("clockdomain: %s: sleep dependency already "
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"set to prevent from idling until %s "
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"idles\n", clkdm->name, cd->clkdm->name);
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atomic_set(&cd->sleepdep_usecount, (v) ? 1 : 0);
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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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*
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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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{
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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 (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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* Ensure that the *dep_usecount registers reflect the current
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* state of the PRCM.
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*/
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list_for_each_entry(clkdm, &clkdm_list, node) {
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_init_wkdep_usecount(clkdm);
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_init_sleepdep_usecount(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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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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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 PTR_ERR(cd);
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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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prm_set_mod_reg_bits((1 << clkdm2->dep_bit),
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clkdm1->pwrdm.ptr->prcm_offs, PM_WKDEP);
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}
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return 0;
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}
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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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|
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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);
|
|
if (IS_ERR(cd)) {
|
|
pr_debug("clockdomain: hardware cannot set/clear wake up of "
|
|
"%s when %s wakes up\n", clkdm1->name, clkdm2->name);
|
|
return PTR_ERR(cd);
|
|
}
|
|
|
|
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);
|
|
|
|
prm_clear_mod_reg_bits((1 << clkdm2->dep_bit),
|
|
clkdm1->pwrdm.ptr->prcm_offs, PM_WKDEP);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* 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;
|
|
|
|
if (!clkdm1 || !clkdm2)
|
|
return -EINVAL;
|
|
|
|
cd = _clkdm_deps_lookup(clkdm2, clkdm1->wkdep_srcs);
|
|
if (IS_ERR(cd)) {
|
|
pr_debug("clockdomain: hardware cannot set/clear wake up of "
|
|
"%s when %s wakes up\n", clkdm1->name, clkdm2->name);
|
|
return PTR_ERR(cd);
|
|
}
|
|
|
|
/* XXX It's faster to return the atomic wkdep_usecount */
|
|
return prm_read_mod_bits_shift(clkdm1->pwrdm.ptr->prcm_offs, PM_WKDEP,
|
|
(1 << clkdm2->dep_bit));
|
|
}
|
|
|
|
/**
|
|
* 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)
|
|
{
|
|
struct clkdm_dep *cd;
|
|
u32 mask = 0;
|
|
|
|
if (!clkdm)
|
|
return -EINVAL;
|
|
|
|
for (cd = clkdm->wkdep_srcs; cd && cd->clkdm_name; cd++) {
|
|
if (!omap_chip_is(cd->omap_chip))
|
|
continue;
|
|
|
|
/* PRM accesses are slow, so minimize them */
|
|
mask |= 1 << cd->clkdm->dep_bit;
|
|
atomic_set(&cd->wkdep_usecount, 0);
|
|
}
|
|
|
|
prm_clear_mod_reg_bits(mask, clkdm->pwrdm.ptr->prcm_offs, PM_WKDEP);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* 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;
|
|
|
|
if (!cpu_is_omap34xx())
|
|
return -EINVAL;
|
|
|
|
if (!clkdm1 || !clkdm2)
|
|
return -EINVAL;
|
|
|
|
cd = _clkdm_deps_lookup(clkdm2, clkdm1->sleepdep_srcs);
|
|
if (IS_ERR(cd)) {
|
|
pr_debug("clockdomain: hardware cannot set/clear sleep "
|
|
"dependency affecting %s from %s\n", clkdm1->name,
|
|
clkdm2->name);
|
|
return PTR_ERR(cd);
|
|
}
|
|
|
|
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);
|
|
|
|
cm_set_mod_reg_bits((1 << clkdm2->dep_bit),
|
|
clkdm1->pwrdm.ptr->prcm_offs,
|
|
OMAP3430_CM_SLEEPDEP);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* 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;
|
|
|
|
if (!cpu_is_omap34xx())
|
|
return -EINVAL;
|
|
|
|
if (!clkdm1 || !clkdm2)
|
|
return -EINVAL;
|
|
|
|
cd = _clkdm_deps_lookup(clkdm2, clkdm1->sleepdep_srcs);
|
|
if (IS_ERR(cd)) {
|
|
pr_debug("clockdomain: hardware cannot set/clear sleep "
|
|
"dependency affecting %s from %s\n", clkdm1->name,
|
|
clkdm2->name);
|
|
return PTR_ERR(cd);
|
|
}
|
|
|
|
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);
|
|
|
|
cm_clear_mod_reg_bits((1 << clkdm2->dep_bit),
|
|
clkdm1->pwrdm.ptr->prcm_offs,
|
|
OMAP3430_CM_SLEEPDEP);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* 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;
|
|
|
|
if (!cpu_is_omap34xx())
|
|
return -EINVAL;
|
|
|
|
if (!clkdm1 || !clkdm2)
|
|
return -EINVAL;
|
|
|
|
cd = _clkdm_deps_lookup(clkdm2, clkdm1->sleepdep_srcs);
|
|
if (IS_ERR(cd)) {
|
|
pr_debug("clockdomain: hardware cannot set/clear sleep "
|
|
"dependency affecting %s from %s\n", clkdm1->name,
|
|
clkdm2->name);
|
|
return PTR_ERR(cd);
|
|
}
|
|
|
|
/* XXX It's faster to return the atomic sleepdep_usecount */
|
|
return prm_read_mod_bits_shift(clkdm1->pwrdm.ptr->prcm_offs,
|
|
OMAP3430_CM_SLEEPDEP,
|
|
(1 << clkdm2->dep_bit));
|
|
}
|
|
|
|
/**
|
|
* 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)
|
|
{
|
|
struct clkdm_dep *cd;
|
|
u32 mask = 0;
|
|
|
|
if (!cpu_is_omap34xx())
|
|
return -EINVAL;
|
|
|
|
if (!clkdm)
|
|
return -EINVAL;
|
|
|
|
for (cd = clkdm->sleepdep_srcs; cd && cd->clkdm_name; cd++) {
|
|
if (!omap_chip_is(cd->omap_chip))
|
|
continue;
|
|
|
|
/* PRM accesses are slow, so minimize them */
|
|
mask |= 1 << cd->clkdm->dep_bit;
|
|
atomic_set(&cd->sleepdep_usecount, 0);
|
|
}
|
|
|
|
prm_clear_mod_reg_bits(mask, clkdm->pwrdm.ptr->prcm_offs,
|
|
OMAP3430_CM_SLEEPDEP);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* omap2_clkdm_clktrctrl_read - read the clkdm's current state transition mode
|
|
* @clkdm: struct clkdm * of a clockdomain
|
|
*
|
|
* Return the clockdomain @clkdm current state transition mode from the
|
|
* corresponding domain CM_CLKSTCTRL register. Returns -EINVAL if @clkdm
|
|
* is NULL or the current mode upon success.
|
|
*/
|
|
static int omap2_clkdm_clktrctrl_read(struct clockdomain *clkdm)
|
|
{
|
|
u32 v;
|
|
|
|
if (!clkdm)
|
|
return -EINVAL;
|
|
|
|
v = __raw_readl(clkdm->clkstctrl_reg);
|
|
v &= clkdm->clktrctrl_mask;
|
|
v >>= __ffs(clkdm->clktrctrl_mask);
|
|
|
|
return v;
|
|
}
|
|
|
|
/**
|
|
* omap2_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 omap2_clkdm_sleep(struct clockdomain *clkdm)
|
|
{
|
|
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;
|
|
}
|
|
|
|
pr_debug("clockdomain: forcing sleep on %s\n", clkdm->name);
|
|
|
|
if (cpu_is_omap24xx()) {
|
|
|
|
cm_set_mod_reg_bits(OMAP24XX_FORCESTATE,
|
|
clkdm->pwrdm.ptr->prcm_offs, OMAP2_PM_PWSTCTRL);
|
|
|
|
} else if (cpu_is_omap34xx() | cpu_is_omap44xx()) {
|
|
|
|
u32 bits = (OMAP34XX_CLKSTCTRL_FORCE_SLEEP <<
|
|
__ffs(clkdm->clktrctrl_mask));
|
|
|
|
u32 v = __raw_readl(clkdm->clkstctrl_reg);
|
|
v &= ~(clkdm->clktrctrl_mask);
|
|
v |= bits;
|
|
__raw_writel(v, clkdm->clkstctrl_reg);
|
|
|
|
} else {
|
|
BUG();
|
|
};
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* omap2_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 omap2_clkdm_wakeup(struct clockdomain *clkdm)
|
|
{
|
|
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;
|
|
}
|
|
|
|
pr_debug("clockdomain: forcing wakeup on %s\n", clkdm->name);
|
|
|
|
if (cpu_is_omap24xx()) {
|
|
|
|
cm_clear_mod_reg_bits(OMAP24XX_FORCESTATE,
|
|
clkdm->pwrdm.ptr->prcm_offs, OMAP2_PM_PWSTCTRL);
|
|
|
|
} else if (cpu_is_omap34xx() | cpu_is_omap44xx()) {
|
|
|
|
u32 bits = (OMAP34XX_CLKSTCTRL_FORCE_WAKEUP <<
|
|
__ffs(clkdm->clktrctrl_mask));
|
|
|
|
u32 v = __raw_readl(clkdm->clkstctrl_reg);
|
|
v &= ~(clkdm->clktrctrl_mask);
|
|
v |= bits;
|
|
__raw_writel(v, clkdm->clkstctrl_reg);
|
|
|
|
} else {
|
|
BUG();
|
|
};
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* omap2_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 omap2_clkdm_allow_idle(struct clockdomain *clkdm)
|
|
{
|
|
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;
|
|
}
|
|
|
|
pr_debug("clockdomain: enabling automatic idle transitions for %s\n",
|
|
clkdm->name);
|
|
|
|
if (atomic_read(&clkdm->usecount) > 0)
|
|
_clkdm_add_autodeps(clkdm);
|
|
|
|
_omap2_clkdm_set_hwsup(clkdm, 1);
|
|
|
|
pwrdm_clkdm_state_switch(clkdm);
|
|
}
|
|
|
|
/**
|
|
* omap2_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 omap2_clkdm_deny_idle(struct clockdomain *clkdm)
|
|
{
|
|
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;
|
|
}
|
|
|
|
pr_debug("clockdomain: disabling automatic idle transitions for %s\n",
|
|
clkdm->name);
|
|
|
|
_omap2_clkdm_set_hwsup(clkdm, 0);
|
|
|
|
if (atomic_read(&clkdm->usecount) > 0)
|
|
_clkdm_del_autodeps(clkdm);
|
|
}
|
|
|
|
|
|
/* Clockdomain-to-clock framework interface code */
|
|
|
|
/**
|
|
* omap2_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 omap2_clkdm_clk_enable(struct clockdomain *clkdm, struct clk *clk)
|
|
{
|
|
int v;
|
|
|
|
/*
|
|
* XXX Rewrite this code to maintain a list of enabled
|
|
* downstream clocks for debugging purposes?
|
|
*/
|
|
|
|
if (!clkdm || !clk || !clkdm->clkstctrl_reg)
|
|
return -EINVAL;
|
|
|
|
if (atomic_inc_return(&clkdm->usecount) > 1)
|
|
return 0;
|
|
|
|
/* Clockdomain now has one enabled downstream clock */
|
|
|
|
pr_debug("clockdomain: clkdm %s: clk %s now enabled\n", clkdm->name,
|
|
clk->name);
|
|
|
|
v = omap2_clkdm_clktrctrl_read(clkdm);
|
|
|
|
if ((cpu_is_omap34xx() && v == OMAP34XX_CLKSTCTRL_ENABLE_AUTO) ||
|
|
(cpu_is_omap24xx() && v == OMAP24XX_CLKSTCTRL_ENABLE_AUTO)) {
|
|
/* Disable HW transitions when we are changing deps */
|
|
_omap2_clkdm_set_hwsup(clkdm, 0);
|
|
_clkdm_add_autodeps(clkdm);
|
|
_omap2_clkdm_set_hwsup(clkdm, 1);
|
|
} else {
|
|
omap2_clkdm_wakeup(clkdm);
|
|
}
|
|
|
|
pwrdm_wait_transition(clkdm->pwrdm.ptr);
|
|
pwrdm_clkdm_state_switch(clkdm);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* omap2_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 and debugging
|
|
* is enabled; or returns 0 upon success or if the clockdomain is in
|
|
* hwsup idle mode.
|
|
*/
|
|
int omap2_clkdm_clk_disable(struct clockdomain *clkdm, struct clk *clk)
|
|
{
|
|
int v;
|
|
|
|
/*
|
|
* XXX Rewrite this code to maintain a list of enabled
|
|
* downstream clocks for debugging purposes?
|
|
*/
|
|
|
|
if (!clkdm || !clk || !clkdm->clkstctrl_reg)
|
|
return -EINVAL;
|
|
|
|
#ifdef DEBUG
|
|
if (atomic_read(&clkdm->usecount) == 0) {
|
|
WARN_ON(1); /* underflow */
|
|
return -ERANGE;
|
|
}
|
|
#endif
|
|
|
|
if (atomic_dec_return(&clkdm->usecount) > 0)
|
|
return 0;
|
|
|
|
/* All downstream clocks of this clockdomain are now disabled */
|
|
|
|
pr_debug("clockdomain: clkdm %s: clk %s now disabled\n", clkdm->name,
|
|
clk->name);
|
|
|
|
v = omap2_clkdm_clktrctrl_read(clkdm);
|
|
|
|
if ((cpu_is_omap34xx() && v == OMAP34XX_CLKSTCTRL_ENABLE_AUTO) ||
|
|
(cpu_is_omap24xx() && v == OMAP24XX_CLKSTCTRL_ENABLE_AUTO)) {
|
|
/* Disable HW transitions when we are changing deps */
|
|
_omap2_clkdm_set_hwsup(clkdm, 0);
|
|
_clkdm_del_autodeps(clkdm);
|
|
_omap2_clkdm_set_hwsup(clkdm, 1);
|
|
} else {
|
|
omap2_clkdm_sleep(clkdm);
|
|
}
|
|
|
|
pwrdm_clkdm_state_switch(clkdm);
|
|
|
|
return 0;
|
|
}
|
|
|