--- /dev/null
+/*
+ * 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
Code Review / kvmfornfv.git / blobdiff