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+/*
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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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+
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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/string.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/clk-provider.h>
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+
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+#include <linux/io.h>
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+
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+#include <linux/bitops.h>
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+
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+#include "soc.h"
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+#include "clock.h"
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+#include "clockdomain.h"
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+
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+/* clkdm_list contains all registered struct clockdomains */
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+static LIST_HEAD(clkdm_list);
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+
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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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+
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+static struct clkdm_ops *arch_clkdm;
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+
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+/* Private functions */
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+
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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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+
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+ if (!name)
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+ return NULL;
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+
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+ clkdm = NULL;
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+
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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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+
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+ return clkdm;
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+}
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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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+
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+ if (!clkdm || !clkdm->name)
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+ return -EINVAL;
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+
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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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+
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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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+
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+ list_add(&clkdm->node, &clkdm_list);
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+
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+ pwrdm_add_clkdm(pwrdm, clkdm);
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+
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+ spin_lock_init(&clkdm->lock);
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+
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+ pr_debug("clockdomain: registered %s\n", clkdm->name);
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+
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+ return 0;
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+}
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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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+
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+ if (!clkdm || !deps)
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+ return ERR_PTR(-EINVAL);
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+
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+ for (cd = deps; cd->clkdm_name; cd++) {
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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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+
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+ if (cd->clkdm == clkdm)
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+ break;
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+ }
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+
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+ if (!cd->clkdm_name)
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+ return ERR_PTR(-ENOENT);
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+
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+ return cd;
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+}
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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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+
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+ if (!autodep)
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+ return;
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+
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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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