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The LITMUS^RT kernel.

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l soc.h for mach-omap1 and mach-omap2' href='/cgit/cgit.cgi/litmus-rt-ext-res.git/commit/arch/arm/mach-omap2/clockdomain.c?id=e4c060db2c13f10de09101afc564763f9fd0019a'>e4c060db2c13

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/*
 * OMAP2/3/4 clockdomain framework functions
 *
 * Copyright (C) 2008-2011 Texas Instruments, Inc.
 * Copyright (C) 2008-2011 Nokia Corporation
 *
 * Written by Paul Walmsley and Jouni Högander
 * Added OMAP4 specific support by Abhijit Pagare <abhijitpagare@ti.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */
#undef DEBUG

#include <linux/kernel.h>
#include <linux/device.h>
#include <linux/list.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/delay.h>
#include <linux/clk.h>
#include <linux/limits.h>
#include <linux/err.h>
#include <linux/clk-provider.h>

#include <linux/io.h>

#include <linux/bitops.h>

#include "soc.h"
#include "clock.h"
#include "clockdomain.h"

/* clkdm_list contains all registered struct clockdomains */
static LIST_HEAD(clkdm_list);

/* array of clockdomain deps to be added/removed when clkdm in hwsup mode */
static struct clkdm_autodep *autodeps;

static struct clkdm_ops *arch_clkdm;

/* Private functions */

static struct clockdomain *_clkdm_lookup(const char *name)
{
	struct clockdomain *clkdm, *temp_clkdm;

	if (!name)
		return NULL;

	clkdm = NULL;

	list_for_each_entry(temp_clkdm, &clkdm_list, node) {
		if (!strcmp(name, temp_clkdm->name)) {
			clkdm = temp_clkdm;
			break;
		}
	}

	return clkdm;
}

/**
 * _clkdm_register - register a clockdomain
 * @clkdm: struct clockdomain * to register
 *
 * Adds a clockdomain to the internal clockdomain list.
 * Returns -EINVAL if given a null pointer, -EEXIST if a clockdomain is
 * already registered by the provided name, or 0 upon success.
 */
static int _clkdm_register(struct clockdomain *clkdm)
{
	struct powerdomain *pwrdm;

	if (!clkdm || !clkdm->name)
		return -EINVAL;

	pwrdm = pwrdm_lookup(clkdm->pwrdm.name);
	if (!pwrdm) {
		pr_err("clockdomain: %s: powerdomain %s does not exist\n",
			clkdm->name, clkdm->pwrdm.name);
		return -EINVAL;
	}
	clkdm->pwrdm.ptr = pwrdm;

	/* Verify that the clockdomain is not already registered */
	if (_clkdm_lookup(clkdm->name))
		return -EEXIST;

	list_add(&clkdm->node, &clkdm_list);

	pwrdm_add_clkdm(pwrdm, clkdm);

	pr_debug("clockdomain: registered %s\n", clkdm->name);

	return 0;
}

/* _clkdm_deps_lookup - look up the specified clockdomain in a clkdm list */
static struct clkdm_dep *_clkdm_deps_lookup(struct clockdomain *clkdm,
					    struct clkdm_dep *deps)
{
	struct clkdm_dep *cd;

	if (!clkdm || !deps)
		return ERR_PTR(-EINVAL);

	for (cd = deps; cd->clkdm_name; cd++) {
		if (!cd->clkdm && cd->clkdm_name)
			cd->clkdm = _clkdm_lookup(cd->clkdm_name);

		if (cd->clkdm == clkdm)
			break;
	}

	if (!cd->clkdm_name)
		return ERR_PTR(-ENOENT);

	return cd;
}

/**
 * _autodep_lookup - resolve autodep clkdm names to clkdm pointers; store
 * @autodep: struct clkdm_autodep * to resolve
 *
 * Resolve autodep clockdomain names to clockdomain pointers via
 * clkdm_lookup() and store the pointers in the autodep structure.  An
 * "autodep" is a clockdomain sleep/wakeup dependency that is
 * automatically added and removed whenever clocks in the associated
 * clockdomain are enabled or disabled (respectively) when the
 * clockdomain is in hardware-supervised mode.	Meant to be called
 * once at clockdomain layer initialization, since these should remain
 * fixed for a particular architecture.  No return value.
 *
 * XXX autodeps are deprecated and should be removed at the earliest
 * opportunity
 */
static void _autodep_lookup(struct clkdm_autodep *autodep)
{
	struct clockdomain *clkdm;

	if (!autodep)
		return;

	clkdm = clkdm_lookup(autodep->clkdm.name);
	if (!clkdm) {
		pr_err("clockdomain: autodeps: clockdomain %s does not exist\n",
			 autodep->clkdm.name);
		clkdm = ERR_PTR(-ENOENT);
	}
	autodep->clkdm.ptr = clkdm;
}

/**
 * _resolve_clkdm_deps() - resolve clkdm_names in @clkdm_deps to clkdms
 * @clkdm: clockdomain that we are resolving dependencies for
 * @clkdm_deps: ptr to array of struct clkdm_deps to resolve
 *
 * Iterates through @clkdm_deps, looking up the struct clockdomain named by
 * clkdm_name and storing the clockdomain pointer in the struct clkdm_dep.
 * No return value.
 */
static void _resolve_clkdm_deps(struct clockdomain *clkdm,
				struct clkdm_dep *clkdm_deps)
{
	struct clkdm_dep *cd;

	for (cd = clkdm_deps; cd && cd->clkdm_name; cd++) {
		if (cd->clkdm)
			continue;
		cd->clkdm = _clkdm_lookup(cd->clkdm_name);

		WARN(!cd->clkdm, "clockdomain: %s: could not find clkdm %s while resolving dependencies - should never happen",
		     clkdm->name, cd->clkdm_name);
	}
}

/**
 * _clkdm_add_wkdep - add a wakeup dependency from clkdm2 to clkdm1 (lockless)
 * @clkdm1: wake this struct clockdomain * up (dependent)
 * @clkdm2: when this struct clockdomain * wakes up (source)
 *
 * When the clockdomain represented by @clkdm2 wakes up, wake up
 * @clkdm1. Implemented in hardware on the OMAP, this feature is
 * designed to reduce wakeup latency of the dependent clockdomain @clkdm1.
 * Returns -EINVAL if presented with invalid clockdomain pointers,
 * -ENOENT if @clkdm2 cannot wake up clkdm1 in hardware, or 0 upon
 * success.
 */
static int _clkdm_add_wkdep(struct clockdomain *clkdm1,
			    struct clockdomain *clkdm2)
{
	struct clkdm_dep *cd;
	int ret = 0;

	if (!clkdm1 || !clkdm2)
		return -EINVAL;

	cd = _clkdm_deps_lookup(clkdm2, clkdm1->wkdep_srcs);
	if (IS_ERR(cd))
		ret = PTR_ERR(cd);

	if (!arch_clkdm || !arch_clkdm->clkdm_add_wkdep)
		ret = -EINVAL;

	if (ret) {
		pr_debug("clockdomain: hardware cannot set/clear wake up of %s when %s wakes up\n",
			 clkdm1->name, clkdm2->name);
		return ret;
	}

	cd->wkdep_usecount++;
	if (cd->wkdep_usecount == 1) {
		pr_debug("clockdomain: hardware will wake up %s when %s wakes up\n",
			 clkdm1->name, clkdm2->name);

		ret = arch_clkdm->clkdm_add_wkdep(clkdm1, clkdm2);
	}

	return ret;
}

/**
 * _clkdm_del_wkdep - remove a wakeup dep from clkdm2 to clkdm1 (lockless)
 * @clkdm1: wake this struct clockdomain * up (dependent)
 * @clkdm2: when this struct clockdomain * wakes up (source)
 *
 * Remove a wakeup dependency causing @clkdm1 to wake up when @clkdm2
 * wakes up.  Returns -EINVAL if presented with invalid clockdomain
 * pointers, -ENOENT if @clkdm2 cannot wake up clkdm1 in hardware, or
 * 0 upon success.
 */
static int _clkdm_del_wkdep(struct clockdomain *clkdm1,
			    struct clockdomain *clkdm2)
{
	struct clkdm_dep *cd;
	int ret = 0;

	if (!clkdm1 || !clkdm2)
		return -EINVAL;

	cd = _clkdm_deps_lookup(clkdm2, clkdm1->wkdep_srcs);
	if (IS_ERR(cd))
		ret = PTR_ERR(cd);

	if (!arch_clkdm || !arch_clkdm->clkdm_del_wkdep)
		ret = -EINVAL;

	if (ret) {
		pr_debug("clockdomain: hardware cannot set/clear wake up of %s when %s wakes up\n",
			 clkdm1->name, clkdm2->name);
		return ret;
	}

	cd->wkdep_usecount--;
	if (cd->wkdep_usecount == 0) {
		pr_debug("clockdomain: hardware will no longer wake up %s after %s wakes up\n",
			 clkdm1->name, clkdm2->name);

		ret = arch_clkdm->clkdm_del_wkdep(clkdm1, clkdm2);
	}

	return ret;
}

/**
 * _clkdm_add_sleepdep - add a sleep dependency from clkdm2 to clkdm1 (lockless)
 * @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.
 */
static 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;
	}

	cd->sleepdep_usecount++;
	if (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 dep from clkdm2 to clkdm1 (lockless)
 * @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.
 */
static 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) {


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