1 files changed, 31 insertions, 539 deletions

diff --git a/arch/arm/mach-tegra/clock.c b/arch/arm/mach-tegra/clock.c
index 58f981c0819c..632133fc985b 100644
--- a/arch/arm/mach-tegra/clock.c
+++ b/arch/arm/mach-tegra/clock.c
@@ -1,6 +1,7 @@
 /*
  *
  * Copyright (C) 2010 Google, Inc.
+ * Copyright (c) 2012 NVIDIA CORPORATION.  All rights reserved.
  *
  * Author:
  *      Colin Cross <ccross@google.com>
@@ -19,8 +20,6 @@
 #include <linux/kernel.h>
 #include <linux/clk.h>
 #include <linux/clkdev.h>
-#include <linux/debugfs.h>
-#include <linux/delay.h>
 #include <linux/init.h>
 #include <linux/list.h>
 #include <linux/module.h>
@@ -36,321 +35,67 @@
 /*
  * Locking:
  *
- * Each struct clk has a spinlock.
- *
- * To avoid AB-BA locking problems, locks must always be traversed from child
- * clock to parent clock.  For example, when enabling a clock, the clock's lock
- * is taken, and then clk_enable is called on the parent, which take's the
- * parent clock's lock.  There is one exceptions to this ordering: When dumping
- * the clock tree through debugfs.  In this case, clk_lock_all is called,
- * which attemps to iterate through the entire list of clocks and take every
- * clock lock.  If any call to spin_trylock fails, all locked clocks are
- * unlocked, and the process is retried.  When all the locks are held,
- * the only clock operation that can be called is clk_get_rate_all_locked.
- *
- * Within a single clock, no clock operation can call another clock operation
- * on itself, except for clk_get_rate_locked and clk_set_rate_locked.  Any
- * clock operation can call any other clock operation on any of it's possible
- * parents.
- *
  * An additional mutex, clock_list_lock, is used to protect the list of all
  * clocks.
  *
- * The clock operations must lock internally to protect against
- * read-modify-write on registers that are shared by multiple clocks
  */
 static DEFINE_MUTEX(clock_list_lock);
 static LIST_HEAD(clocks);
 
-struct clk *tegra_get_clock_by_name(const char *name)
+void tegra_clk_add(struct clk *clk)
 {
-        struct clk *c;
-        struct clk *ret = NULL;
-        mutex_lock(&clock_list_lock);
-        list_for_each_entry(c, &clocks, node) {
-                if (strcmp(c->name, name) == 0) {
-                        ret = c;
-                        break;
-                }
-        }
-        mutex_unlock(&clock_list_lock);
-        return ret;
-}
-
-/* Must be called with c->spinlock held */
-static unsigned long clk_predict_rate_from_parent(struct clk *c, struct clk *p)
-{
-        u64 rate;
-
-        rate = clk_get_rate(p);
-
-        if (c->mul != 0 && c->div != 0) {
-                rate *= c->mul;
-                rate += c->div - 1; /* round up */
-                do_div(rate, c->div);
-        }
-
-        return rate;
-}
-
-/* Must be called with c->spinlock held */
-unsigned long clk_get_rate_locked(struct clk *c)
-{
-        unsigned long rate;
-
-        if (c->parent)
-                rate = clk_predict_rate_from_parent(c, c->parent);
-        else
-                rate = c->rate;
-
-        return rate;
-}
-
-unsigned long clk_get_rate(struct clk *c)
-{
-        unsigned long flags;
-        unsigned long rate;
-
-        spin_lock_irqsave(&c->spinlock, flags);
-
-        rate = clk_get_rate_locked(c);
-
-        spin_unlock_irqrestore(&c->spinlock, flags);
-
-        return rate;
-}
-EXPORT_SYMBOL(clk_get_rate);
-
-int clk_reparent(struct clk *c, struct clk *parent)
-{
-        c->parent = parent;
-        return 0;
-}
-
-void clk_init(struct clk *c)
-{
-        spin_lock_init(&c->spinlock);
-
-        if (c->ops && c->ops->init)
-                c->ops->init(c);
-
-        if (!c->ops || !c->ops->enable) {
-                c->refcnt++;
-                c->set = true;
-                if (c->parent)
-                        c->state = c->parent->state;
-                else
-                        c->state = ON;
-        }
+        struct clk_tegra *c = to_clk_tegra(__clk_get_hw(clk));
 
         mutex_lock(&clock_list_lock);
         list_add(&c->node, &clocks);
         mutex_unlock(&clock_list_lock);
 }
 
-int clk_enable(struct clk *c)
-{
-        int ret = 0;
-        unsigned long flags;
-
-        spin_lock_irqsave(&c->spinlock, flags);
-
-        if (c->refcnt == 0) {
-                if (c->parent) {
-                        ret = clk_enable(c->parent);
-                        if (ret)
-                                goto out;
-                }
-
-                if (c->ops && c->ops->enable) {
-                        ret = c->ops->enable(c);
-                        if (ret) {
-                                if (c->parent)
-                                        clk_disable(c->parent);
-                                goto out;
-                        }
-                        c->state = ON;
-                        c->set = true;
-                }
-        }
-        c->refcnt++;
-out:
-        spin_unlock_irqrestore(&c->spinlock, flags);
-        return ret;
-}
-EXPORT_SYMBOL(clk_enable);
-
-void clk_disable(struct clk *c)
-{
-        unsigned long flags;
-
-        spin_lock_irqsave(&c->spinlock, flags);
-
-        if (c->refcnt == 0) {
-                WARN(1, "Attempting to disable clock %s with refcnt 0", c->name);
-                spin_unlock_irqrestore(&c->spinlock, flags);
-                return;
-        }
-        if (c->refcnt == 1) {
-                if (c->ops && c->ops->disable)
-                        c->ops->disable(c);
-
-                if (c->parent)
-                        clk_disable(c->parent);
-
-                c->state = OFF;
-        }
-        c->refcnt--;
-
-        spin_unlock_irqrestore(&c->spinlock, flags);
-}
-EXPORT_SYMBOL(clk_disable);
-
-int clk_set_parent(struct clk *c, struct clk *parent)
-{
-        int ret;
-        unsigned long flags;
-        unsigned long new_rate;
-        unsigned long old_rate;
-
-        spin_lock_irqsave(&c->spinlock, flags);
-
-        if (!c->ops || !c->ops->set_parent) {
-                ret = -ENOSYS;
-                goto out;
-        }
-
-        new_rate = clk_predict_rate_from_parent(c, parent);
-        old_rate = clk_get_rate_locked(c);
-
-        ret = c->ops->set_parent(c, parent);
-        if (ret)
-                goto out;
-
-out:
-        spin_unlock_irqrestore(&c->spinlock, flags);
-        return ret;
-}
-EXPORT_SYMBOL(clk_set_parent);
-
-struct clk *clk_get_parent(struct clk *c)
-{
-        return c->parent;
-}
-EXPORT_SYMBOL(clk_get_parent);
-
-int clk_set_rate_locked(struct clk *c, unsigned long rate)
-{
-        long new_rate;
-
-        if (!c->ops || !c->ops->set_rate)
-                return -ENOSYS;
-
-        if (rate > c->max_rate)
-                rate = c->max_rate;
-
-        if (c->ops && c->ops->round_rate) {
-                new_rate = c->ops->round_rate(c, rate);
-
-                if (new_rate < 0)
-                        return new_rate;
-
-                rate = new_rate;
-        }
-
-        return c->ops->set_rate(c, rate);
-}
-
-int clk_set_rate(struct clk *c, unsigned long rate)
-{
-        int ret;
-        unsigned long flags;
-
-        spin_lock_irqsave(&c->spinlock, flags);
-
-        ret = clk_set_rate_locked(c, rate);
-
-        spin_unlock_irqrestore(&c->spinlock, flags);
-
-        return ret;
-}
-EXPORT_SYMBOL(clk_set_rate);
-
-
-/* Must be called with clocks lock and all indvidual clock locks held */
-unsigned long clk_get_rate_all_locked(struct clk *c)
+struct clk *tegra_get_clock_by_name(const char *name)
 {
-        u64 rate;
-        int mul = 1;
-        int div = 1;
-        struct clk *p = c;
-
-        while (p) {
-                c = p;
-                if (c->mul != 0 && c->div != 0) {
-                        mul *= c->mul;
-                        div *= c->div;
+        struct clk_tegra *c;
+        struct clk *ret = NULL;
+        mutex_lock(&clock_list_lock);
+        list_for_each_entry(c, &clocks, node) {
+                if (strcmp(__clk_get_name(c->hw.clk), name) == 0) {
+                        ret = c->hw.clk;
+                        break;
                 }
-                p = c->parent;
         }
-
-        rate = c->rate;
-        rate *= mul;
-        do_div(rate, div);
-
-        return rate;
-}
-
-long clk_round_rate(struct clk *c, unsigned long rate)
-{
-        unsigned long flags;
-        long ret;
-
-        spin_lock_irqsave(&c->spinlock, flags);
-
-        if (!c->ops || !c->ops->round_rate) {
-                ret = -ENOSYS;
-                goto out;
-        }
-
-        if (rate > c->max_rate)
-                rate = c->max_rate;
-
-        ret = c->ops->round_rate(c, rate);
-
-out:
-        spin_unlock_irqrestore(&c->spinlock, flags);
+        mutex_unlock(&clock_list_lock);
         return ret;
 }
-EXPORT_SYMBOL(clk_round_rate);
 
 static int tegra_clk_init_one_from_table(struct tegra_clk_init_table *table)
 {
         struct clk *c;
         struct clk *p;
+        struct clk *parent;
 
         int ret = 0;
 
         c = tegra_get_clock_by_name(table->name);
 
         if (!c) {
-                pr_warning("Unable to initialize clock %s\n",
+                pr_warn("Unable to initialize clock %s\n",
                         table->name);
                 return -ENODEV;
         }
 
+        parent = clk_get_parent(c);
+
         if (table->parent) {
                 p = tegra_get_clock_by_name(table->parent);
                 if (!p) {
-                        pr_warning("Unable to find parent %s of clock %s\n",
+                        pr_warn("Unable to find parent %s of clock %s\n",
                                 table->parent, table->name);
                         return -ENODEV;
                 }
 
-                if (c->parent != p) {
+                if (parent != p) {
                         ret = clk_set_parent(c, p);
                         if (ret) {
-                                pr_warning("Unable to set parent %s of clock %s: %d\n",
+                                pr_warn("Unable to set parent %s of clock %s: %d\n",
                                         table->parent, table->name, ret);
                                 return -EINVAL;
                         }
@@ -360,16 +105,16 @@ static int tegra_clk_init_one_from_table(struct tegra_clk_init_table *table)
         if (table->rate && table->rate != clk_get_rate(c)) {
                 ret = clk_set_rate(c, table->rate);
                 if (ret) {
-                        pr_warning("Unable to set clock %s to rate %lu: %d\n",
+                        pr_warn("Unable to set clock %s to rate %lu: %d\n",
                                 table->name, table->rate, ret);
                         return -EINVAL;
                 }
         }
 
         if (table->enabled) {
-                ret = clk_enable(c);
+                ret = clk_prepare_enable(c);
                 if (ret) {
-                        pr_warning("Unable to enable clock %s: %d\n",
+                        pr_warn("Unable to enable clock %s: %d\n",
                                 table->name, ret);
                         return -EINVAL;
                 }
@@ -383,19 +128,20 @@ void tegra_clk_init_from_table(struct tegra_clk_init_table *table)
         for (; table->name; table++)
                 tegra_clk_init_one_from_table(table);
 }
-EXPORT_SYMBOL(tegra_clk_init_from_table);
 
 void tegra_periph_reset_deassert(struct clk *c)
 {
-        BUG_ON(!c->ops->reset);
-        c->ops->reset(c, false);
+        struct clk_tegra *clk = to_clk_tegra(__clk_get_hw(c));
+        BUG_ON(!clk->reset);
+        clk->reset(__clk_get_hw(c), false);
 }
 EXPORT_SYMBOL(tegra_periph_reset_deassert);
 
 void tegra_periph_reset_assert(struct clk *c)
 {
-        BUG_ON(!c->ops->reset);
-        c->ops->reset(c, true);
+        struct clk_tegra *clk = to_clk_tegra(__clk_get_hw(c));
+        BUG_ON(!clk->reset);
+        clk->reset(__clk_get_hw(c), true);
 }
 EXPORT_SYMBOL(tegra_periph_reset_assert);
 
@@ -405,268 +151,14 @@ EXPORT_SYMBOL(tegra_periph_reset_assert);
 int tegra_clk_cfg_ex(struct clk *c, enum tegra_clk_ex_param p, u32 setting)
 {
         int ret = 0;
-        unsigned long flags;
+        struct clk_tegra *clk = to_clk_tegra(__clk_get_hw(c));
 
-        spin_lock_irqsave(&c->spinlock, flags);
-
-        if (!c->ops || !c->ops->clk_cfg_ex) {
+        if (!clk->clk_cfg_ex) {
                 ret = -ENOSYS;
                 goto out;
         }
-        ret = c->ops->clk_cfg_ex(c, p, setting);
+        ret = clk->clk_cfg_ex(__clk_get_hw(c), p, setting);
 
 out:
-        spin_unlock_irqrestore(&c->spinlock, flags);
-
         return ret;
 }
-
-#ifdef CONFIG_DEBUG_FS
-
-static int __clk_lock_all_spinlocks(void)
-{
-        struct clk *c;
-
-        list_for_each_entry(c, &clocks, node)
-                if (!spin_trylock(&c->spinlock))
-                        goto unlock_spinlocks;
-
-        return 0;
-
-unlock_spinlocks:
-        list_for_each_entry_continue_reverse(c, &clocks, node)
-                spin_unlock(&c->spinlock);
-
-        return -EAGAIN;
-}
-
-static void __clk_unlock_all_spinlocks(void)
-{
-        struct clk *c;
-
-        list_for_each_entry_reverse(c, &clocks, node)
-                spin_unlock(&c->spinlock);
-}
-
-/*
- * This function retries until it can take all locks, and may take
- * an arbitrarily long time to complete.
- * Must be called with irqs enabled, returns with irqs disabled
- * Must be called with clock_list_lock held
- */
-static void clk_lock_all(void)
-{
-        int ret;
-retry:
-        local_irq_disable();
-
-        ret = __clk_lock_all_spinlocks();
-        if (ret)
-                goto failed_spinlocks;
-
-        /* All locks taken successfully, return */
-        return;
-
-failed_spinlocks:
-        local_irq_enable();
-        yield();
-        goto retry;
-}
-
-/*
- * Unlocks all clocks after a clk_lock_all
- * Must be called with irqs disabled, returns with irqs enabled
- * Must be called with clock_list_lock held
- */
-static void clk_unlock_all(void)
-{
-        __clk_unlock_all_spinlocks();
-
-        local_irq_enable();
-}
-
-static struct dentry *clk_debugfs_root;
-
-
-static void clock_tree_show_one(struct seq_file *s, struct clk *c, int level)
-{
-        struct clk *child;
-        const char *state = "uninit";
-        char div[8] = {0};
-
-        if (c->state == ON)
-                state = "on";
-        else if (c->state == OFF)
-                state = "off";
-
-        if (c->mul != 0 && c->div != 0) {
-                if (c->mul > c->div) {
-                        int mul = c->mul / c->div;
-                        int mul2 = (c->mul * 10 / c->div) % 10;
-                        int mul3 = (c->mul * 10) % c->div;
-                        if (mul2 == 0 && mul3 == 0)
-                                snprintf(div, sizeof(div), "x%d", mul);
-                        else if (mul3 == 0)
-                                snprintf(div, sizeof(div), "x%d.%d", mul, mul2);
-                        else
-                                snprintf(div, sizeof(div), "x%d.%d..", mul, mul2);
-                } else {
-                        snprintf(div, sizeof(div), "%d%s", c->div / c->mul,
-                                (c->div % c->mul) ? ".5" : "");
-                }
-        }
-
-        seq_printf(s, "%*s%c%c%-*s %-6s %-3d %-8s %-10lu\n",
-                level * 3 + 1, "",
-                c->rate > c->max_rate ? '!' : ' ',
-                !c->set ? '*' : ' ',
-                30 - level * 3, c->name,
-                state, c->refcnt, div, clk_get_rate_all_locked(c));
-
-        list_for_each_entry(child, &clocks, node) {
-                if (child->parent != c)
-                        continue;
-
-                clock_tree_show_one(s, child, level + 1);
-        }
-}
-
-static int clock_tree_show(struct seq_file *s, void *data)
-{
-        struct clk *c;
-        seq_printf(s, "   clock                          state  ref div      rate\n");
-        seq_printf(s, "--------------------------------------------------------------\n");
-
-        mutex_lock(&clock_list_lock);
-
-        clk_lock_all();
-
-        list_for_each_entry(c, &clocks, node)
-                if (c->parent == NULL)
-                        clock_tree_show_one(s, c, 0);
-
-        clk_unlock_all();
-
-        mutex_unlock(&clock_list_lock);
-        return 0;
-}
-
-static int clock_tree_open(struct inode *inode, struct file *file)
-{
-        return single_open(file, clock_tree_show, inode->i_private);
-}
-
-static const struct file_operations clock_tree_fops = {
-        .open           = clock_tree_open,
-        .read           = seq_read,
-        .llseek         = seq_lseek,
-        .release        = single_release,
-};
-
-static int possible_parents_show(struct seq_file *s, void *data)
-{
-        struct clk *c = s->private;
-        int i;
-
-        for (i = 0; c->inputs[i].input; i++) {
-                char *first = (i == 0) ? "" : " ";
-                seq_printf(s, "%s%s", first, c->inputs[i].input->name);
-        }
-        seq_printf(s, "\n");
-        return 0;
-}
-
-static int possible_parents_open(struct inode *inode, struct file *file)
-{
-        return single_open(file, possible_parents_show, inode->i_private);
-}
-
-static const struct file_operations possible_parents_fops = {
-        .open           = possible_parents_open,
-        .read           = seq_read,
-        .llseek         = seq_lseek,
-        .release        = single_release,
-};
-
-static int clk_debugfs_register_one(struct clk *c)
-{
-        struct dentry *d;
-
-        d = debugfs_create_dir(c->name, clk_debugfs_root);
-        if (!d)
-                return -ENOMEM;
-        c->dent = d;
-
-        d = debugfs_create_u8("refcnt", S_IRUGO, c->dent, (u8 *)&c->refcnt);
-        if (!d)
-                goto err_out;
-
-        d = debugfs_create_u32("rate", S_IRUGO, c->dent, (u32 *)&c->rate);
-        if (!d)
-                goto err_out;
-
-        d = debugfs_create_x32("flags", S_IRUGO, c->dent, (u32 *)&c->flags);
-        if (!d)
-                goto err_out;
-
-        if (c->inputs) {
-                d = debugfs_create_file("possible_parents", S_IRUGO, c->dent,
-                        c, &possible_parents_fops);
-                if (!d)
-                        goto err_out;
-        }
-
-        return 0;
-
-err_out:
-        debugfs_remove_recursive(c->dent);
-        return -ENOMEM;
-}
-
-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;
-}
-
-int __init tegra_clk_debugfs_init(void)
-{
-        struct clk *c;
-        struct dentry *d;
-        int err = -ENOMEM;
-
-        d = debugfs_create_dir("clock", NULL);
-        if (!d)
-                return -ENOMEM;
-        clk_debugfs_root = d;
-
-        d = debugfs_create_file("clock_tree", S_IRUGO, clk_debugfs_root, NULL,
-                &clock_tree_fops);
-        if (!d)
-                goto err_out;
-
-        list_for_each_entry(c, &clocks, node) {
-                err = clk_debugfs_register(c);
-                if (err)
-                        goto err_out;
-        }
-        return 0;
-err_out:
-        debugfs_remove_recursive(clk_debugfs_root);
-        return err;
-}
-
-#endif