Initial import

1 files changed, 307 insertions, 0 deletions

diff --git a/arch/avr32/mach-at32ap/clock.c b/arch/avr32/mach-at32ap/clock.c
new file mode 100644
index 000000000..23b1a97fa
--- /dev/null
+++ b/arch/avr32/mach-at32ap/clock.c
@@ -0,0 +1,307 @@
+/*
+ * Clock management for AT32AP CPUs
+ *
+ * Copyright (C) 2006 Atmel Corporation
+ *
+ * Based on arch/arm/mach-at91/clock.c
+ *   Copyright (C) 2005 David Brownell
+ *   Copyright (C) 2005 Ivan Kokshaysky
+ *
+ * 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/clk.h>
+#include <linux/err.h>
+#include <linux/export.h>
+#include <linux/device.h>
+#include <linux/string.h>
+#include <linux/list.h>
+
+#include <mach/chip.h>
+
+#include "clock.h"
+
+/* at32 clock list */
+static LIST_HEAD(at32_clock_list);
+
+static DEFINE_SPINLOCK(clk_lock);
+static DEFINE_SPINLOCK(clk_list_lock);
+
+void at32_clk_register(struct clk *clk)
+{
+	spin_lock(&clk_list_lock);
+	/* add the new item to the end of the list */
+	list_add_tail(&clk->list, &at32_clock_list);
+	spin_unlock(&clk_list_lock);
+}
+
+static struct clk *__clk_get(struct device *dev, const char *id)
+{
+	struct clk *clk;
+
+	list_for_each_entry(clk, &at32_clock_list, list) {
+		if (clk->dev == dev && strcmp(id, clk->name) == 0) {
+			return clk;
+		}
+	}
+
+	return ERR_PTR(-ENOENT);
+}
+
+struct clk *clk_get(struct device *dev, const char *id)
+{
+	struct clk *clk;
+
+	spin_lock(&clk_list_lock);
+	clk = __clk_get(dev, id);
+	spin_unlock(&clk_list_lock);
+
+	return clk;
+}
+
+EXPORT_SYMBOL(clk_get);
+
+void clk_put(struct clk *clk)
+{
+	/* clocks are static for now, we can't free them */
+}
+EXPORT_SYMBOL(clk_put);
+
+static void __clk_enable(struct clk *clk)
+{
+	if (clk->parent)
+		__clk_enable(clk->parent);
+	if (clk->users++ == 0 && clk->mode)
+		clk->mode(clk, 1);
+}
+
+int clk_enable(struct clk *clk)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&clk_lock, flags);
+	__clk_enable(clk);
+	spin_unlock_irqrestore(&clk_lock, flags);
+
+	return 0;
+}
+EXPORT_SYMBOL(clk_enable);
+
+static void __clk_disable(struct clk *clk)
+{
+	if (clk->users == 0) {
+		printk(KERN_ERR "%s: mismatched disable\n", clk->name);
+		WARN_ON(1);
+		return;
+	}
+
+	if (--clk->users == 0 && clk->mode)
+		clk->mode(clk, 0);
+	if (clk->parent)
+		__clk_disable(clk->parent);
+}
+
+void clk_disable(struct clk *clk)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&clk_lock, flags);
+	__clk_disable(clk);
+	spin_unlock_irqrestore(&clk_lock, flags);
+}
+EXPORT_SYMBOL(clk_disable);
+
+unsigned long clk_get_rate(struct clk *clk)
+{
+	unsigned long flags;
+	unsigned long rate;
+
+	spin_lock_irqsave(&clk_lock, flags);
+	rate = clk->get_rate(clk);
+	spin_unlock_irqrestore(&clk_lock, flags);
+
+	return rate;
+}
+EXPORT_SYMBOL(clk_get_rate);
+
+long clk_round_rate(struct clk *clk, unsigned long rate)
+{
+	unsigned long flags, actual_rate;
+
+	if (!clk->set_rate)
+		return -ENOSYS;
+
+	spin_lock_irqsave(&clk_lock, flags);
+	actual_rate = clk->set_rate(clk, rate, 0);
+	spin_unlock_irqrestore(&clk_lock, flags);
+
+	return actual_rate;
+}
+EXPORT_SYMBOL(clk_round_rate);
+
+int clk_set_rate(struct clk *clk, unsigned long rate)
+{
+	unsigned long flags;
+	long ret;
+
+	if (!clk->set_rate)
+		return -ENOSYS;
+
+	spin_lock_irqsave(&clk_lock, flags);
+	ret = clk->set_rate(clk, rate, 1);
+	spin_unlock_irqrestore(&clk_lock, flags);
+
+	return (ret < 0) ? ret : 0;
+}
+EXPORT_SYMBOL(clk_set_rate);
+
+int clk_set_parent(struct clk *clk, struct clk *parent)
+{
+	unsigned long flags;
+	int ret;
+
+	if (!clk->set_parent)
+		return -ENOSYS;
+
+	spin_lock_irqsave(&clk_lock, flags);
+	ret = clk->set_parent(clk, parent);
+	spin_unlock_irqrestore(&clk_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);
+
+
+
+#ifdef CONFIG_DEBUG_FS
+
+/* /sys/kernel/debug/at32ap_clk */
+
+#include <linux/io.h>
+#include <linux/debugfs.h>
+#include <linux/seq_file.h>
+#include "pm.h"
+
+
+#define	NEST_DELTA	2
+#define	NEST_MAX	6
+
+struct clkinf {
+	struct seq_file	*s;
+	unsigned	nest;
+};
+
+static void
+dump_clock(struct clk *parent, struct clkinf *r)
+{
+	unsigned	nest = r->nest;
+	char		buf[16 + NEST_MAX];
+	struct clk	*clk;
+	unsigned	i;
+
+	/* skip clocks coupled to devices that aren't registered */
+	if (parent->dev && !dev_name(parent->dev) && !parent->users)
+		return;
+
+	/* <nest spaces> name <pad to end> */
+	memset(buf, ' ', sizeof(buf) - 1);
+	buf[sizeof(buf) - 1] = 0;
+	i = strlen(parent->name);
+	memcpy(buf + nest, parent->name,
+			min(i, (unsigned)(sizeof(buf) - 1 - nest)));
+
+	seq_printf(r->s, "%s%c users=%2d %-3s %9ld Hz",
+		buf, parent->set_parent ? '*' : ' ',
+		parent->users,
+		parent->users ? "on" : "off",	/* NOTE: not-paranoid!! */
+		clk_get_rate(parent));
+	if (parent->dev)
+		seq_printf(r->s, ", for %s", dev_name(parent->dev));
+	seq_printf(r->s, "\n");
+
+	/* cost of this scan is small, but not linear... */
+	r->nest = nest + NEST_DELTA;
+
+	list_for_each_entry(clk, &at32_clock_list, list) {
+		if (clk->parent == parent)
+			dump_clock(clk, r);
+	}
+	r->nest = nest;
+}
+
+static int clk_show(struct seq_file *s, void *unused)
+{
+	struct clkinf	r;
+	int		i;
+	struct clk 	*clk;
+
+	/* show all the power manager registers */
+	seq_printf(s, "MCCTRL  = %8x\n", pm_readl(MCCTRL));
+	seq_printf(s, "CKSEL   = %8x\n", pm_readl(CKSEL));
+	seq_printf(s, "CPUMASK = %8x\n", pm_readl(CPU_MASK));
+	seq_printf(s, "HSBMASK = %8x\n", pm_readl(HSB_MASK));
+	seq_printf(s, "PBAMASK = %8x\n", pm_readl(PBA_MASK));
+	seq_printf(s, "PBBMASK = %8x\n", pm_readl(PBB_MASK));
+	seq_printf(s, "PLL0    = %8x\n", pm_readl(PLL0));
+	seq_printf(s, "PLL1    = %8x\n", pm_readl(PLL1));
+	seq_printf(s, "IMR     = %8x\n", pm_readl(IMR));
+	for (i = 0; i < 8; i++) {
+		if (i == 5)
+			continue;
+		seq_printf(s, "GCCTRL%d = %8x\n", i, pm_readl(GCCTRL(i)));
+	}
+
+	seq_printf(s, "\n");
+
+	r.s = s;
+	r.nest = 0;
+	/* protected from changes on the list while dumping */
+	spin_lock(&clk_list_lock);
+
+	/* show clock tree as derived from the three oscillators */
+	clk = __clk_get(NULL, "osc32k");
+	dump_clock(clk, &r);
+	clk_put(clk);
+
+	clk = __clk_get(NULL, "osc0");
+	dump_clock(clk, &r);
+	clk_put(clk);
+
+	clk = __clk_get(NULL, "osc1");
+	dump_clock(clk, &r);
+	clk_put(clk);
+
+	spin_unlock(&clk_list_lock);
+
+	return 0;
+}
+
+static int clk_open(struct inode *inode, struct file *file)
+{
+	return single_open(file, clk_show, NULL);
+}
+
+static const struct file_operations clk_operations = {
+	.open		= clk_open,
+	.read		= seq_read,
+	.llseek		= seq_lseek,
+	.release	= single_release,
+};
+
+static int __init clk_debugfs_init(void)
+{
+	(void) debugfs_create_file("at32ap_clk", S_IFREG | S_IRUGO,
+			NULL, NULL, &clk_operations);
+
+	return 0;
+}
+postcore_initcall(clk_debugfs_init);
+
+#endif