--- /dev/null
+/*
+ * linux/arch/arm/plat-omap/clock.c
+ *
+ * Copyright (C) 2004 - 2005 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/version.h>
+#include <linux/config.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/module.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/platform_device.h>
+
+#include <asm/io.h>
+#include <asm/semaphore.h>
+
+#include <asm/arch/clock.h>
+
+LIST_HEAD(clocks);
+static DEFINE_MUTEX(clocks_mutex);
+DEFINE_SPINLOCK(clockfw_lock);
+
+static struct clk_functions *arch_clock;
+
+/*-------------------------------------------------------------------------
+ * Standard clock functions defined in include/linux/clk.h
+ *-------------------------------------------------------------------------*/
+
+/*
+ * Returns a clock. Note that we first try to use device id on the bus
+ * and clock name. If this fails, we try to use clock name only.
+ */
+struct clk * clk_get(struct device *dev, const char *id)
+{
+ struct clk *p, *clk = ERR_PTR(-ENOENT);
+ int idno;
+
+ if (dev == NULL || dev->bus != &platform_bus_type)
+ idno = -1;
+ else
+ idno = to_platform_device(dev)->id;
+
+ mutex_lock(&clocks_mutex);
+
+ list_for_each_entry(p, &clocks, node) {
+ if (p->id == idno &&
+ strcmp(id, p->name) == 0 && try_module_get(p->owner)) {
+ clk = p;
+ goto found;
+ }
+ }
+
+ list_for_each_entry(p, &clocks, node) {
+ if (strcmp(id, p->name) == 0 && try_module_get(p->owner)) {
+ clk = p;
+ break;
+ }
+ }
+
+found:
+ mutex_unlock(&clocks_mutex);
+
+ return clk;
+}
+EXPORT_SYMBOL(clk_get);
+
+int clk_enable(struct clk *clk)
+{
+ unsigned long flags;
+ int ret = 0;
+
+ if (clk == NULL || IS_ERR(clk))
+ return -EINVAL;
+
+ spin_lock_irqsave(&clockfw_lock, flags);
+ if (arch_clock->clk_enable)
+ 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;
+
+ spin_lock_irqsave(&clockfw_lock, flags);
+ if (arch_clock->clk_disable)
+ arch_clock->clk_disable(clk);
+ spin_unlock_irqrestore(&clockfw_lock, flags);
+}
+EXPORT_SYMBOL(clk_disable);
+
+int clk_get_usecount(struct clk *clk)
+{
+ unsigned long flags;
+ int ret = 0;
+
+ if (clk == NULL || IS_ERR(clk))
+ return 0;
+
+ spin_lock_irqsave(&clockfw_lock, flags);
+ ret = clk->usecount;
+ spin_unlock_irqrestore(&clockfw_lock, flags);
+
+ return ret;
+}
+EXPORT_SYMBOL(clk_get_usecount);
+
+unsigned long clk_get_rate(struct clk *clk)
+{
+ unsigned long flags;
+ unsigned long ret = 0;
+
+ 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);
+
+void clk_put(struct clk *clk)
+{
+ if (clk && !IS_ERR(clk))
+ module_put(clk->owner);
+}
+EXPORT_SYMBOL(clk_put);
+
+/*-------------------------------------------------------------------------
+ * Optional clock functions defined in include/linux/clk.h
+ *-------------------------------------------------------------------------*/
+
+long clk_round_rate(struct clk *clk, unsigned long rate)
+{
+ unsigned long flags;
+ long ret = 0;
+
+ if (clk == NULL || IS_ERR(clk))
+ return ret;
+
+ spin_lock_irqsave(&clockfw_lock, flags);
+ if (arch_clock->clk_round_rate)
+ 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;
+
+ spin_lock_irqsave(&clockfw_lock, flags);
+ if (arch_clock->clk_set_rate)
+ ret = arch_clock->clk_set_rate(clk, rate);
+ 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;
+
+ spin_lock_irqsave(&clockfw_lock, flags);
+ if (arch_clock->clk_set_parent)
+ ret = arch_clock->clk_set_parent(clk, parent);
+ spin_unlock_irqrestore(&clockfw_lock, flags);
+
+ return ret;
+}
+EXPORT_SYMBOL(clk_set_parent);
+
+struct clk *clk_get_parent(struct clk *clk)
+{
+ unsigned long flags;
+ struct clk * ret = NULL;
+
+ if (clk == NULL || IS_ERR(clk))
+ return ret;
+
+ spin_lock_irqsave(&clockfw_lock, flags);
+ if (arch_clock->clk_get_parent)
+ ret = arch_clock->clk_get_parent(clk);
+ spin_unlock_irqrestore(&clockfw_lock, flags);
+
+ return ret;
+}
+EXPORT_SYMBOL(clk_get_parent);
+
+/*-------------------------------------------------------------------------
+ * OMAP specific clock functions shared between omap1 and omap2
+ *-------------------------------------------------------------------------*/
+
+unsigned 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 */
+void followparent_recalc(struct clk *clk)
+{
+ if (clk == NULL || IS_ERR(clk))
+ return;
+
+ clk->rate = clk->parent->rate;
+}
+
+/* Propagate rate to children */
+void propagate_rate(struct clk * tclk)
+{
+ struct clk *clkp;
+
+ if (tclk == NULL || IS_ERR(tclk))
+ return;
+
+ list_for_each_entry(clkp, &clocks, node) {
+ if (likely(clkp->parent != tclk))
+ continue;
+ if (likely((u32)clkp->recalc))
+ clkp->recalc(clkp);
+ }
+}
+
+int clk_register(struct clk *clk)
+{
+ if (clk == NULL || IS_ERR(clk))
+ return -EINVAL;
+
+ mutex_lock(&clocks_mutex);
+ 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->node);
+ mutex_unlock(&clocks_mutex);
+}
+EXPORT_SYMBOL(clk_unregister);
+
+void clk_deny_idle(struct clk *clk)
+{
+ unsigned long flags;
+
+ if (clk == NULL || IS_ERR(clk))
+ return;
+
+ spin_lock_irqsave(&clockfw_lock, flags);
+ if (arch_clock->clk_deny_idle)
+ arch_clock->clk_deny_idle(clk);
+ spin_unlock_irqrestore(&clockfw_lock, flags);
+}
+EXPORT_SYMBOL(clk_deny_idle);
+
+void clk_allow_idle(struct clk *clk)
+{
+ unsigned long flags;
+
+ if (clk == NULL || IS_ERR(clk))
+ return;
+
+ spin_lock_irqsave(&clockfw_lock, flags);
+ if (arch_clock->clk_allow_idle)
+ arch_clock->clk_allow_idle(clk);
+ spin_unlock_irqrestore(&clockfw_lock, flags);
+}
+EXPORT_SYMBOL(clk_allow_idle);
+
+/*-------------------------------------------------------------------------*/
+
+int __init clk_init(struct clk_functions * custom_clocks)
+{
+ if (!custom_clocks) {
+ printk(KERN_ERR "No custom clock functions registered\n");
+ BUG();
+ }
+
+ arch_clock = custom_clocks;
+
+ return 0;
+}
git://git.onelab.eu / linux-2.6.git / blobdiff