2 * Clock management for AT32AP CPUs
4 * Copyright (C) 2006 Atmel Corporation
6 * Based on arch/arm/mach-at91/clock.c
7 * Copyright (C) 2005 David Brownell
8 * Copyright (C) 2005 Ivan Kokshaysky
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
14 #include <linux/clk.h>
15 #include <linux/err.h>
16 #include <linux/device.h>
17 #include <linux/string.h>
18 #include <linux/list.h>
20 #include <mach/chip.h>
25 static LIST_HEAD(at32_clock_list);
27 static DEFINE_SPINLOCK(clk_lock);
28 static DEFINE_SPINLOCK(clk_list_lock);
30 void at32_clk_register(struct clk *clk)
32 spin_lock(&clk_list_lock);
33 /* add the new item to the end of the list */
34 list_add_tail(&clk->list, &at32_clock_list);
35 spin_unlock(&clk_list_lock);
38 static struct clk *__clk_get(struct device *dev, const char *id)
42 list_for_each_entry(clk, &at32_clock_list, list) {
43 if (clk->dev == dev && strcmp(id, clk->name) == 0) {
48 return ERR_PTR(-ENOENT);
51 struct clk *clk_get(struct device *dev, const char *id)
55 spin_lock(&clk_list_lock);
56 clk = __clk_get(dev, id);
57 spin_unlock(&clk_list_lock);
62 EXPORT_SYMBOL(clk_get);
64 void clk_put(struct clk *clk)
66 /* clocks are static for now, we can't free them */
68 EXPORT_SYMBOL(clk_put);
70 static void __clk_enable(struct clk *clk)
73 __clk_enable(clk->parent);
74 if (clk->users++ == 0 && clk->mode)
78 int clk_enable(struct clk *clk)
82 spin_lock_irqsave(&clk_lock, flags);
84 spin_unlock_irqrestore(&clk_lock, flags);
88 EXPORT_SYMBOL(clk_enable);
90 static void __clk_disable(struct clk *clk)
92 if (clk->users == 0) {
93 printk(KERN_ERR "%s: mismatched disable\n", clk->name);
98 if (--clk->users == 0 && clk->mode)
101 __clk_disable(clk->parent);
104 void clk_disable(struct clk *clk)
108 spin_lock_irqsave(&clk_lock, flags);
110 spin_unlock_irqrestore(&clk_lock, flags);
112 EXPORT_SYMBOL(clk_disable);
114 unsigned long clk_get_rate(struct clk *clk)
119 spin_lock_irqsave(&clk_lock, flags);
120 rate = clk->get_rate(clk);
121 spin_unlock_irqrestore(&clk_lock, flags);
125 EXPORT_SYMBOL(clk_get_rate);
127 long clk_round_rate(struct clk *clk, unsigned long rate)
129 unsigned long flags, actual_rate;
134 spin_lock_irqsave(&clk_lock, flags);
135 actual_rate = clk->set_rate(clk, rate, 0);
136 spin_unlock_irqrestore(&clk_lock, flags);
140 EXPORT_SYMBOL(clk_round_rate);
142 int clk_set_rate(struct clk *clk, unsigned long rate)
150 spin_lock_irqsave(&clk_lock, flags);
151 ret = clk->set_rate(clk, rate, 1);
152 spin_unlock_irqrestore(&clk_lock, flags);
154 return (ret < 0) ? ret : 0;
156 EXPORT_SYMBOL(clk_set_rate);
158 int clk_set_parent(struct clk *clk, struct clk *parent)
163 if (!clk->set_parent)
166 spin_lock_irqsave(&clk_lock, flags);
167 ret = clk->set_parent(clk, parent);
168 spin_unlock_irqrestore(&clk_lock, flags);
172 EXPORT_SYMBOL(clk_set_parent);
174 struct clk *clk_get_parent(struct clk *clk)
178 EXPORT_SYMBOL(clk_get_parent);
182 #ifdef CONFIG_DEBUG_FS
184 /* /sys/kernel/debug/at32ap_clk */
186 #include <linux/io.h>
187 #include <linux/debugfs.h>
188 #include <linux/seq_file.h>
201 dump_clock(struct clk *parent, struct clkinf *r)
203 unsigned nest = r->nest;
204 char buf[16 + NEST_MAX];
208 /* skip clocks coupled to devices that aren't registered */
209 if (parent->dev && !dev_name(parent->dev) && !parent->users)
212 /* <nest spaces> name <pad to end> */
213 memset(buf, ' ', sizeof(buf) - 1);
214 buf[sizeof(buf) - 1] = 0;
215 i = strlen(parent->name);
216 memcpy(buf + nest, parent->name,
217 min(i, (unsigned)(sizeof(buf) - 1 - nest)));
219 seq_printf(r->s, "%s%c users=%2d %-3s %9ld Hz",
220 buf, parent->set_parent ? '*' : ' ',
222 parent->users ? "on" : "off", /* NOTE: not-paranoid!! */
223 clk_get_rate(parent));
225 seq_printf(r->s, ", for %s", dev_name(parent->dev));
226 seq_printf(r->s, "\n");
228 /* cost of this scan is small, but not linear... */
229 r->nest = nest + NEST_DELTA;
231 list_for_each_entry(clk, &at32_clock_list, list) {
232 if (clk->parent == parent)
238 static int clk_show(struct seq_file *s, void *unused)
244 /* show all the power manager registers */
245 seq_printf(s, "MCCTRL = %8x\n", pm_readl(MCCTRL));
246 seq_printf(s, "CKSEL = %8x\n", pm_readl(CKSEL));
247 seq_printf(s, "CPUMASK = %8x\n", pm_readl(CPU_MASK));
248 seq_printf(s, "HSBMASK = %8x\n", pm_readl(HSB_MASK));
249 seq_printf(s, "PBAMASK = %8x\n", pm_readl(PBA_MASK));
250 seq_printf(s, "PBBMASK = %8x\n", pm_readl(PBB_MASK));
251 seq_printf(s, "PLL0 = %8x\n", pm_readl(PLL0));
252 seq_printf(s, "PLL1 = %8x\n", pm_readl(PLL1));
253 seq_printf(s, "IMR = %8x\n", pm_readl(IMR));
254 for (i = 0; i < 8; i++) {
257 seq_printf(s, "GCCTRL%d = %8x\n", i, pm_readl(GCCTRL(i)));
264 /* protected from changes on the list while dumping */
265 spin_lock(&clk_list_lock);
267 /* show clock tree as derived from the three oscillators */
268 clk = __clk_get(NULL, "osc32k");
272 clk = __clk_get(NULL, "osc0");
276 clk = __clk_get(NULL, "osc1");
280 spin_unlock(&clk_list_lock);
285 static int clk_open(struct inode *inode, struct file *file)
287 return single_open(file, clk_show, NULL);
290 static const struct file_operations clk_operations = {
294 .release = single_release,
297 static int __init clk_debugfs_init(void)
299 (void) debugfs_create_file("at32ap_clk", S_IFREG | S_IRUGO,
300 NULL, NULL, &clk_operations);
304 postcore_initcall(clk_debugfs_init);