[ARM] tegra: Add clock support
v2: fixes from Russell King:
- include linux/io.h instead of asm/io.h
- fix whitespace in Kconfig
- Use spin_lock_init to initialize lock
- Return -ENOSYS instead of BUG for unimplemented clock ops
- Use proper return values in tegra2 clock ops
additional changes:
- Rename some clocks to match dev_ids
- add rate propagation
- add debugfs entries
- add support for clock listed in clk_lookup under multiple dev_ids
v3:
- Replace per-clock locking with global clock lock
- Autodetect clock state on init
- Let clock dividers pick next lower possible frequency
- Add support for clock init tables
- Minor bug fixes
- Fix checkpatch issues
Signed-off-by: Colin Cross <ccross@android.com>
diff --git a/arch/arm/mach-tegra/clock.c b/arch/arm/mach-tegra/clock.c
new file mode 100644
index 0000000..03ad578
--- /dev/null
+++ b/arch/arm/mach-tegra/clock.c
@@ -0,0 +1,488 @@
+/*
+ *
+ * Copyright (C) 2010 Google, Inc.
+ *
+ * Author:
+ * Colin Cross <ccross@google.com>
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/clk.h>
+#include <linux/list.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/debugfs.h>
+#include <linux/slab.h>
+#include <linux/seq_file.h>
+#include <asm/clkdev.h>
+
+#include "clock.h"
+
+static LIST_HEAD(clocks);
+
+static DEFINE_SPINLOCK(clock_lock);
+
+struct clk *tegra_get_clock_by_name(const char *name)
+{
+ struct clk *c;
+ struct clk *ret = NULL;
+ unsigned long flags;
+ spin_lock_irqsave(&clock_lock, flags);
+ list_for_each_entry(c, &clocks, node) {
+ if (strcmp(c->name, name) == 0) {
+ ret = c;
+ break;
+ }
+ }
+ spin_unlock_irqrestore(&clock_lock, flags);
+ return ret;
+}
+
+int clk_reparent(struct clk *c, struct clk *parent)
+{
+ pr_debug("%s: %s\n", __func__, c->name);
+ if (c->refcnt && c->parent)
+ clk_disable_locked(c->parent);
+ c->parent = parent;
+ if (c->refcnt && c->parent)
+ clk_enable_locked(c->parent);
+ list_del(&c->sibling);
+ list_add_tail(&c->sibling, &parent->children);
+ return 0;
+}
+
+static void propagate_rate(struct clk *c)
+{
+ struct clk *clkp;
+ pr_debug("%s: %s\n", __func__, c->name);
+ list_for_each_entry(clkp, &c->children, sibling) {
+ pr_debug(" %s\n", clkp->name);
+ if (clkp->ops->recalculate_rate)
+ clkp->ops->recalculate_rate(clkp);
+ propagate_rate(clkp);
+ }
+}
+
+void clk_init(struct clk *c)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&clock_lock, flags);
+
+ INIT_LIST_HEAD(&c->children);
+ INIT_LIST_HEAD(&c->sibling);
+
+ if (c->ops && c->ops->init)
+ c->ops->init(c);
+
+ list_add(&c->node, &clocks);
+
+ if (c->parent)
+ list_add_tail(&c->sibling, &c->parent->children);
+
+ spin_unlock_irqrestore(&clock_lock, flags);
+}
+
+int clk_enable_locked(struct clk *c)
+{
+ int ret;
+ pr_debug("%s: %s\n", __func__, c->name);
+ if (c->refcnt == 0) {
+ if (c->parent) {
+ ret = clk_enable_locked(c->parent);
+ if (ret)
+ return ret;
+ }
+
+ if (c->ops && c->ops->enable) {
+ ret = c->ops->enable(c);
+ if (ret) {
+ if (c->parent)
+ clk_disable_locked(c->parent);
+ return ret;
+ }
+ c->state = ON;
+#ifdef CONFIG_DEBUG_FS
+ c->set = 1;
+#endif
+ }
+ }
+ c->refcnt++;
+
+ return 0;
+}
+
+int clk_enable(struct clk *c)
+{
+ int ret;
+ unsigned long flags;
+ spin_lock_irqsave(&clock_lock, flags);
+ ret = clk_enable_locked(c);
+ spin_unlock_irqrestore(&clock_lock, flags);
+ return ret;
+}
+EXPORT_SYMBOL(clk_enable);
+
+void clk_disable_locked(struct clk *c)
+{
+ pr_debug("%s: %s\n", __func__, c->name);
+ if (c->refcnt == 0) {
+ WARN(1, "Attempting to disable clock %s with refcnt 0", c->name);
+ return;
+ }
+ if (c->refcnt == 1) {
+ if (c->ops && c->ops->disable)
+ c->ops->disable(c);
+
+ if (c->parent)
+ clk_disable_locked(c->parent);
+
+ c->state = OFF;
+ }
+ c->refcnt--;
+}
+
+void clk_disable(struct clk *c)
+{
+ unsigned long flags;
+ spin_lock_irqsave(&clock_lock, flags);
+ clk_disable_locked(c);
+ spin_unlock_irqrestore(&clock_lock, flags);
+}
+EXPORT_SYMBOL(clk_disable);
+
+int clk_set_parent_locked(struct clk *c, struct clk *parent)
+{
+ int ret;
+
+ pr_debug("%s: %s\n", __func__, c->name);
+
+ if (!c->ops || !c->ops->set_parent)
+ return -ENOSYS;
+
+ ret = c->ops->set_parent(c, parent);
+
+ if (ret)
+ return ret;
+
+ propagate_rate(c);
+
+ return 0;
+}
+
+int clk_set_parent(struct clk *c, struct clk *parent)
+{
+ int ret;
+ unsigned long flags;
+ spin_lock_irqsave(&clock_lock, flags);
+ ret = clk_set_parent_locked(c, parent);
+ spin_unlock_irqrestore(&clock_lock, 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(struct clk *c, unsigned long rate)
+{
+ int ret = 0;
+ unsigned long flags;
+
+ spin_lock_irqsave(&clock_lock, flags);
+
+ pr_debug("%s: %s\n", __func__, c->name);
+
+ if (c->ops && c->ops->set_rate)
+ ret = c->ops->set_rate(c, rate);
+ else
+ ret = -ENOSYS;
+
+ propagate_rate(c);
+
+ spin_unlock_irqrestore(&clock_lock, flags);
+
+ return ret;
+}
+EXPORT_SYMBOL(clk_set_rate);
+
+unsigned long clk_get_rate(struct clk *c)
+{
+ unsigned long flags;
+ unsigned long ret;
+
+ spin_lock_irqsave(&clock_lock, flags);
+
+ pr_debug("%s: %s\n", __func__, c->name);
+
+ ret = c->rate;
+
+ spin_unlock_irqrestore(&clock_lock, flags);
+ return ret;
+}
+EXPORT_SYMBOL(clk_get_rate);
+
+static int tegra_clk_init_one_from_table(struct tegra_clk_init_table *table)
+{
+ struct clk *c;
+ struct clk *p;
+
+ int ret = 0;
+
+ c = tegra_get_clock_by_name(table->name);
+
+ if (!c) {
+ pr_warning("Unable to initialize clock %s\n",
+ table->name);
+ return -ENODEV;
+ }
+
+ if (table->parent) {
+ p = tegra_get_clock_by_name(table->parent);
+ if (!p) {
+ pr_warning("Unable to find parent %s of clock %s\n",
+ table->parent, table->name);
+ return -ENODEV;
+ }
+
+ if (c->parent != p) {
+ ret = clk_set_parent(c, p);
+ if (ret) {
+ pr_warning("Unable to set parent %s of clock %s: %d\n",
+ table->parent, table->name, ret);
+ return -EINVAL;
+ }
+ }
+ }
+
+ 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",
+ table->name, table->rate, ret);
+ return -EINVAL;
+ }
+ }
+
+ if (table->enabled) {
+ ret = clk_enable(c);
+ if (ret) {
+ pr_warning("Unable to enable clock %s: %d\n",
+ table->name, ret);
+ return -EINVAL;
+ }
+ }
+
+ return 0;
+}
+
+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)
+{
+ tegra2_periph_reset_deassert(c);
+}
+EXPORT_SYMBOL(tegra_periph_reset_deassert);
+
+void tegra_periph_reset_assert(struct clk *c)
+{
+ tegra2_periph_reset_assert(c);
+}
+EXPORT_SYMBOL(tegra_periph_reset_assert);
+
+int __init tegra_init_clock(void)
+{
+ tegra2_init_clocks();
+
+ return 0;
+}
+
+#ifdef CONFIG_DEBUG_FS
+static struct dentry *clk_debugfs_root;
+
+
+static void clock_tree_show_one(struct seq_file *s, struct clk *c, int level)
+{
+ struct clk *child;
+ struct clk *safe;
+ const char *state = "uninit";
+ char div[5] = {0};
+
+ if (c->state == ON)
+ state = "on";
+ else if (c->state == OFF)
+ state = "off";
+
+ if (c->mul != 0 && c->div != 0) {
+ BUG_ON(c->mul > 2);
+ if (c->mul > c->div)
+ snprintf(div, sizeof(div), "x%d", c->mul / c->div);
+ else
+ snprintf(div, sizeof(div), "%d%s", c->div / c->mul,
+ (c->div % c->mul) ? ".5" : "");
+ }
+
+ seq_printf(s, "%*s%-*s %-6s %-3d %-5s %-10lu\n",
+ level * 3 + 1, c->set ? "" : "*",
+ 30 - level * 3, c->name,
+ state, c->refcnt, div, c->rate);
+ list_for_each_entry_safe(child, safe, &c->children, sibling) {
+ clock_tree_show_one(s, child, level + 1);
+ }
+}
+
+static int clock_tree_show(struct seq_file *s, void *data)
+{
+ struct clk *c;
+ unsigned long flags;
+ seq_printf(s, " clock state ref div rate \n");
+ seq_printf(s, "-----------------------------------------------------------\n");
+ spin_lock_irqsave(&clock_lock, flags);
+ list_for_each_entry(c, &clocks, node)
+ if (c->parent == NULL)
+ clock_tree_show_one(s, c, 0);
+ spin_unlock_irqrestore(&clock_lock, flags);
+ 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, *child, *child_tmp;
+
+ 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:
+ d = c->dent;
+ list_for_each_entry_safe(child, child_tmp, &d->d_subdirs, d_u.d_child)
+ debugfs_remove(child);
+ debugfs_remove(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;
+}
+
+static int __init 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;
+}
+
+late_initcall(clk_debugfs_init);
+#endif