1 files changed, 594 insertions, 0 deletions

diff --git a/arch/arm/plat-omap/clock.c b/arch/arm/plat-omap/clock.c
new file mode 100644
index 00000000000..3ba4d11ca73
--- /dev/null
+++ b/arch/arm/plat-omap/clock.c
@@ -0,0 +1,594 @@
+/*
+ *  linux/arch/arm/plat-omap/clock.c
+ *
+ *  Copyright (C) 2004 - 2008 Nokia corporation
+ *  Written by Tuukka Tikkanen <tuukka.tikkanen@elektrobit.com>
+ *
+ *  Modified for omap shared clock framework by Tony Lindgren <tony@atomide.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.
+ */
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/list.h>
+#include <linux/errno.h>
+#include <linux/err.h>
+#include <linux/string.h>
+#include <linux/clk.h>
+#include <linux/mutex.h>
+#include <linux/cpufreq.h>
+#include <linux/debugfs.h>
+#include <linux/io.h>
+
+#include <plat/clock.h>
+
+static LIST_HEAD(clocks);
+static DEFINE_MUTEX(clocks_mutex);
+static DEFINE_SPINLOCK(clockfw_lock);
+
+static struct clk_functions *arch_clock;
+
+/*
+ * Standard clock functions defined in include/linux/clk.h
+ */
+
+int clk_enable(struct clk *clk)
+{
+        unsigned long flags;
+        int ret;
+
+        if (clk == NULL || IS_ERR(clk))
+                return -EINVAL;
+
+        if (!arch_clock || !arch_clock->clk_enable)
+                return -EINVAL;
+
+        spin_lock_irqsave(&clockfw_lock, flags);
+        ret = arch_clock->clk_enable(clk);
+        spin_unlock_irqrestore(&clockfw_lock, flags);
+
+        return ret;
+}
+EXPORT_SYMBOL(clk_enable);
+
+void clk_disable(struct clk *clk)
+{
+        unsigned long flags;
+
+        if (clk == NULL || IS_ERR(clk))
+                return;
+
+        if (!arch_clock || !arch_clock->clk_disable)
+                return;
+
+        spin_lock_irqsave(&clockfw_lock, flags);
+        if (clk->usecount == 0) {
+                pr_err("Trying disable clock %s with 0 usecount\n",
+                       clk->name);
+                WARN_ON(1);
+                goto out;
+        }
+
+        arch_clock->clk_disable(clk);
+
+out:
+        spin_unlock_irqrestore(&clockfw_lock, flags);
+}
+EXPORT_SYMBOL(clk_disable);
+
+unsigned long clk_get_rate(struct clk *clk)
+{
+        unsigned long flags;
+        unsigned long ret;
+
+        if (clk == NULL || IS_ERR(clk))
+                return 0;
+
+        spin_lock_irqsave(&clockfw_lock, flags);
+        ret = clk->rate;
+        spin_unlock_irqrestore(&clockfw_lock, flags);
+
+        return ret;
+}
+EXPORT_SYMBOL(clk_get_rate);
+
+/*
+ * Optional clock functions defined in include/linux/clk.h
+ */
+
+long clk_round_rate(struct clk *clk, unsigned long rate)
+{
+        unsigned long flags;
+        long ret;
+
+        if (clk == NULL || IS_ERR(clk))
+                return 0;
+
+        if (!arch_clock || !arch_clock->clk_round_rate)
+                return 0;
+
+        spin_lock_irqsave(&clockfw_lock, flags);
+        ret = arch_clock->clk_round_rate(clk, rate);
+        spin_unlock_irqrestore(&clockfw_lock, flags);
+
+        return ret;
+}
+EXPORT_SYMBOL(clk_round_rate);
+
+int clk_set_rate(struct clk *clk, unsigned long rate)
+{
+        unsigned long flags;
+        int ret = -EINVAL;
+
+        if (clk == NULL || IS_ERR(clk))
+                return ret;
+
+        if (!arch_clock || !arch_clock->clk_set_rate)
+                return ret;
+
+        spin_lock_irqsave(&clockfw_lock, flags);
+        ret = arch_clock->clk_set_rate(clk, rate);
+        if (ret == 0)
+                propagate_rate(clk);
+        spin_unlock_irqrestore(&clockfw_lock, flags);
+
+        return ret;
+}
+EXPORT_SYMBOL(clk_set_rate);
+
+int clk_set_parent(struct clk *clk, struct clk *parent)
+{
+        unsigned long flags;
+        int ret = -EINVAL;
+
+        if (clk == NULL || IS_ERR(clk) || parent == NULL || IS_ERR(parent))
+                return ret;
+
+        if (!arch_clock || !arch_clock->clk_set_parent)
+                return ret;
+
+        spin_lock_irqsave(&clockfw_lock, flags);
+        if (clk->usecount == 0) {
+                ret = arch_clock->clk_set_parent(clk, parent);
+                if (ret == 0)
+                        propagate_rate(clk);
+        } else
+                ret = -EBUSY;
+        spin_unlock_irqrestore(&clockfw_lock, flags);
+
+        return ret;
+}
+EXPORT_SYMBOL(clk_set_parent);
+
+struct clk *clk_get_parent(struct clk *clk)
+{
+        return clk->parent;
+}
+EXPORT_SYMBOL(clk_get_parent);
+
+/*
+ * OMAP specific clock functions shared between omap1 and omap2
+ */
+
+int __initdata mpurate;
+
+/*
+ * By default we use the rate set by the bootloader.
+ * You can override this with mpurate= cmdline option.
+ */
+static int __init omap_clk_setup(char *str)
+{
+        get_option(&str, &mpurate);
+
+        if (!mpurate)
+                return 1;
+
+        if (mpurate < 1000)
+                mpurate *= 1000000;
+
+        return 1;
+}
+__setup("mpurate=", omap_clk_setup);
+
+/* Used for clocks that always have same value as the parent clock */
+unsigned long followparent_recalc(struct clk *clk)
+{
+        return clk->parent->rate;
+}
+
+/*
+ * Used for clocks that have the same value as the parent clock,
+ * divided by some factor
+ */
+unsigned long omap_fixed_divisor_recalc(struct clk *clk)
+{
+        WARN_ON(!clk->fixed_div);
+
+        return clk->parent->rate / clk->fixed_div;
+}
+
+void clk_reparent(struct clk *child, struct clk *parent)
+{
+        list_del_init(&child->sibling);
+        if (parent)
+                list_add(&child->sibling, &parent->children);
+        child->parent = parent;
+
+        /* now do the debugfs renaming to reattach the child
+           to the proper parent */
+}
+
+/* Propagate rate to children */
+void propagate_rate(struct clk *tclk)
+{
+        struct clk *clkp;
+
+        list_for_each_entry(clkp, &tclk->children, sibling) {
+                if (clkp->recalc)
+                        clkp->rate = clkp->recalc(clkp);
+                propagate_rate(clkp);
+        }
+}
+
+static LIST_HEAD(root_clks);
+
+/**
+ * recalculate_root_clocks - recalculate and propagate all root clocks
+ *
+ * Recalculates all root clocks (clocks with no parent), which if the
+ * clock's .recalc is set correctly, should also propagate their rates.
+ * Called at init.
+ */
+void recalculate_root_clocks(void)
+{
+        struct clk *clkp;
+
+        list_for_each_entry(clkp, &root_clks, sibling) {
+                if (clkp->recalc)
+                        clkp->rate = clkp->recalc(clkp);
+                propagate_rate(clkp);
+        }
+}
+
+/**
+ * clk_preinit - initialize any fields in the struct clk before clk init
+ * @clk: struct clk * to initialize
+ *
+ * Initialize any struct clk fields needed before normal clk initialization
+ * can run.  No return value.
+ */
+void clk_preinit(struct clk *clk)
+{
+        INIT_LIST_HEAD(&clk->children);
+}
+
+int clk_register(struct clk *clk)
+{
+        if (clk == NULL || IS_ERR(clk))
+                return -EINVAL;
+
+        /*
+         * trap out already registered clocks
+         */
+        if (clk->node.next || clk->node.prev)
+                return 0;
+
+        mutex_lock(&clocks_mutex);
+        if (clk->parent)
+                list_add(&clk->sibling, &clk->parent->children);
+        else
+                list_add(&clk->sibling, &root_clks);
+
+        list_add(&clk->node, &clocks);
+        if (clk->init)
+                clk->init(clk);
+        mutex_unlock(&clocks_mutex);
+
+        return 0;
+}
+EXPORT_SYMBOL(clk_register);
+
+void clk_unregister(struct clk *clk)
+{
+        if (clk == NULL || IS_ERR(clk))
+                return;
+
+        mutex_lock(&clocks_mutex);
+        list_del(&clk->sibling);
+        list_del(&clk->node);
+        mutex_unlock(&clocks_mutex);
+}
+EXPORT_SYMBOL(clk_unregister);
+
+void clk_enable_init_clocks(void)
+{
+        struct clk *clkp;
+
+        list_for_each_entry(clkp, &clocks, node) {
+                if (clkp->flags & ENABLE_ON_INIT)
+                        clk_enable(clkp);
+        }
+}
+
+/**
+ * omap_clk_get_by_name - locate OMAP struct clk by its name
+ * @name: name of the struct clk to locate
+ *
+ * Locate an OMAP struct clk by its name.  Assumes that struct clk
+ * names are unique.  Returns NULL if not found or a pointer to the
+ * struct clk if found.
+ */
+struct clk *omap_clk_get_by_name(const char *name)
+{
+        struct clk *c;
+        struct clk *ret = NULL;
+
+        mutex_lock(&clocks_mutex);
+
+        list_for_each_entry(c, &clocks, node) {
+                if (!strcmp(c->name, name)) {
+                        ret = c;
+                        break;
+                }
+        }
+
+        mutex_unlock(&clocks_mutex);
+
+        return ret;
+}
+
+int omap_clk_enable_autoidle_all(void)
+{
+        struct clk *c;
+        unsigned long flags;
+
+        spin_lock_irqsave(&clockfw_lock, flags);
+
+        list_for_each_entry(c, &clocks, node)
+                if (c->ops->allow_idle)
+                        c->ops->allow_idle(c);
+
+        spin_unlock_irqrestore(&clockfw_lock, flags);
+
+        return 0;
+}
+
+int omap_clk_disable_autoidle_all(void)
+{
+        struct clk *c;
+        unsigned long flags;
+
+        spin_lock_irqsave(&clockfw_lock, flags);
+
+        list_for_each_entry(c, &clocks, node)
+                if (c->ops->deny_idle)
+                        c->ops->deny_idle(c);
+
+        spin_unlock_irqrestore(&clockfw_lock, flags);
+
+        return 0;
+}
+
+/*
+ * Low level helpers
+ */
+static int clkll_enable_null(struct clk *clk)
+{
+        return 0;
+}
+
+static void clkll_disable_null(struct clk *clk)
+{
+}
+
+const struct clkops clkops_null = {
+        .enable         = clkll_enable_null,
+        .disable        = clkll_disable_null,
+};
+
+/*
+ * Dummy clock
+ *
+ * Used for clock aliases that are needed on some OMAPs, but not others
+ */
+struct clk dummy_ck = {
+        .name   = "dummy",
+        .ops    = &clkops_null,
+};
+
+#ifdef CONFIG_CPU_FREQ
+void clk_init_cpufreq_table(struct cpufreq_frequency_table **table)
+{
+        unsigned long flags;
+
+        if (!arch_clock || !arch_clock->clk_init_cpufreq_table)
+                return;
+
+        spin_lock_irqsave(&clockfw_lock, flags);
+        arch_clock->clk_init_cpufreq_table(table);
+        spin_unlock_irqrestore(&clockfw_lock, flags);
+}
+
+void clk_exit_cpufreq_table(struct cpufreq_frequency_table **table)
+{
+        unsigned long flags;
+
+        if (!arch_clock || !arch_clock->clk_exit_cpufreq_table)
+                return;
+
+        spin_lock_irqsave(&clockfw_lock, flags);
+        arch_clock->clk_exit_cpufreq_table(table);
+        spin_unlock_irqrestore(&clockfw_lock, flags);
+}
+#endif
+
+/*
+ *
+ */
+
+#ifdef CONFIG_OMAP_RESET_CLOCKS
+/*
+ * Disable any unused clocks left on by the bootloader
+ */
+static int __init clk_disable_unused(void)
+{
+        struct clk *ck;
+        unsigned long flags;
+
+        if (!arch_clock || !arch_clock->clk_disable_unused)
+                return 0;
+
+        pr_info("clock: disabling unused clocks to save power\n");
+        list_for_each_entry(ck, &clocks, node) {
+                if (ck->ops == &clkops_null)
+                        continue;
+
+                if (ck->usecount > 0 || !ck->enable_reg)
+                        continue;
+
+                spin_lock_irqsave(&clockfw_lock, flags);
+                arch_clock->clk_disable_unused(ck);
+                spin_unlock_irqrestore(&clockfw_lock, flags);
+        }
+
+        return 0;
+}
+late_initcall(clk_disable_unused);
+late_initcall(omap_clk_enable_autoidle_all);
+#endif
+
+int __init clk_init(struct clk_functions * custom_clocks)
+{
+        if (!custom_clocks) {
+                pr_err("No custom clock functions registered\n");
+                BUG();
+        }
+
+        arch_clock = custom_clocks;
+
+        return 0;
+}
+
+#if defined(CONFIG_PM_DEBUG) && defined(CONFIG_DEBUG_FS)
+/*
+ *      debugfs support to trace clock tree hierarchy and attributes
+ */
+
+#include <linux/debugfs.h>
+#include <linux/seq_file.h>
+
+static struct dentry *clk_debugfs_root;
+
+static int clk_dbg_show_summary(struct seq_file *s, void *unused)
+{
+        struct clk *c;
+        struct clk *pa;
+
+        seq_printf(s, "%-30s %-30s %-10s %s\n",
+                "clock-name", "parent-name", "rate", "use-count");
+
+        list_for_each_entry(c, &clocks, node) {
+                pa = c->parent;
+                seq_printf(s, "%-30s %-30s %-10lu %d\n",
+                        c->name, pa ? pa->name : "none", c->rate, c->usecount);
+        }
+
+        return 0;
+}
+
+static int clk_dbg_open(struct inode *inode, struct file *file)
+{
+        return single_open(file, clk_dbg_show_summary, inode->i_private);
+}
+
+static const struct file_operations debug_clock_fops = {
+        .open           = clk_dbg_open,
+        .read           = seq_read,
+        .llseek         = seq_lseek,
+        .release        = single_release,
+};
+
+static int clk_debugfs_register_one(struct clk *c)
+{
+        int err;
+        struct dentry *d;
+        struct clk *pa = c->parent;
+
+        d = debugfs_create_dir(c->name, pa ? pa->dent : clk_debugfs_root);
+        if (!d)
+                return -ENOMEM;
+        c->dent = d;
+
+        d = debugfs_create_u8("usecount", S_IRUGO, c->dent, (u8 *)&c->usecount);
+        if (!d) {
+                err = -ENOMEM;
+                goto err_out;
+        }
+        d = debugfs_create_u32("rate", S_IRUGO, c->dent, (u32 *)&c->rate);
+        if (!d) {
+                err = -ENOMEM;
+                goto err_out;
+        }
+        d = debugfs_create_x32("flags", S_IRUGO, c->dent, (u32 *)&c->flags);
+        if (!d) {
+                err = -ENOMEM;
+                goto err_out;
+        }
+        return 0;
+
+err_out:
+        debugfs_remove_recursive(c->dent);
+        return err;
+}
+
+static int clk_debugfs_register(struct clk *c)
+{
+        int err;
+        struct clk *pa = c->parent;
+
+        if (pa && !pa->dent) {
+                err = clk_debugfs_register(pa);
+                if (err)
+                        return err;
+        }
+
+        if (!c->dent) {
+                err = clk_debugfs_register_one(c);
+                if (err)
+                        return err;
+        }
+        return 0;
+}
+
+static int __init clk_debugfs_init(void)
+{
+        struct clk *c;
+        struct dentry *d;
+        int err;
+
+        d = debugfs_create_dir("clock", NULL);
+        if (!d)
+                return -ENOMEM;
+        clk_debugfs_root = d;
+
+        list_for_each_entry(c, &clocks, node) {
+                err = clk_debugfs_register(c);
+                if (err)
+                        goto err_out;
+        }
+
+        d = debugfs_create_file("summary", S_IRUGO,
+                d, NULL, &debug_clock_fops);
+        if (!d)
+                return -ENOMEM;
+
+        return 0;
+err_out:
+        debugfs_remove_recursive(clk_debugfs_root);
+        return err;
+}
+late_initcall(clk_debugfs_init);
+
+#endif /* defined(CONFIG_PM_DEBUG) && defined(CONFIG_DEBUG_FS) */