2 * Copyright (C) 2006 - 2008 Lemote Inc. & Insititute of Computing Technology
3 * Author: Yanhua, yanh@lemote.com
5 * This file is subject to the terms and conditions of the GNU General Public
6 * License. See the file "COPYING" in the main directory of this archive
10 #include <linux/cpufreq.h>
11 #include <linux/errno.h>
12 #include <linux/export.h>
13 #include <linux/init.h>
14 #include <linux/list.h>
15 #include <linux/mutex.h>
16 #include <linux/spinlock.h>
18 #include <asm/clock.h>
19 #include <asm/mach-loongson/loongson.h>
21 static LIST_HEAD(clock_list);
22 static DEFINE_SPINLOCK(clock_lock);
23 static DEFINE_MUTEX(clock_list_sem);
25 /* Minimum CLK support */
27 DC_ZERO, DC_25PT = 2, DC_37PT, DC_50PT, DC_62PT, DC_75PT,
28 DC_87PT, DC_DISABLE, DC_RESV
31 struct cpufreq_frequency_table loongson2_clockmod_table[] = {
32 {DC_RESV, CPUFREQ_ENTRY_INVALID},
33 {DC_ZERO, CPUFREQ_ENTRY_INVALID},
41 {DC_RESV, CPUFREQ_TABLE_END},
43 EXPORT_SYMBOL_GPL(loongson2_clockmod_table);
45 static struct clk cpu_clk = {
47 .flags = CLK_ALWAYS_ENABLED | CLK_RATE_PROPAGATES,
51 struct clk *clk_get(struct device *dev, const char *id)
55 EXPORT_SYMBOL(clk_get);
57 static void propagate_rate(struct clk *clk)
61 list_for_each_entry(clkp, &clock_list, node) {
62 if (likely(clkp->parent != clk))
64 if (likely(clkp->ops && clkp->ops->recalc))
65 clkp->ops->recalc(clkp);
66 if (unlikely(clkp->flags & CLK_RATE_PROPAGATES))
71 int clk_enable(struct clk *clk)
75 EXPORT_SYMBOL(clk_enable);
77 void clk_disable(struct clk *clk)
80 EXPORT_SYMBOL(clk_disable);
82 unsigned long clk_get_rate(struct clk *clk)
84 return (unsigned long)clk->rate;
86 EXPORT_SYMBOL(clk_get_rate);
88 void clk_put(struct clk *clk)
91 EXPORT_SYMBOL(clk_put);
93 int clk_set_rate(struct clk *clk, unsigned long rate)
99 if (likely(clk->ops && clk->ops->set_rate)) {
102 spin_lock_irqsave(&clock_lock, flags);
103 ret = clk->ops->set_rate(clk, rate, 0);
104 spin_unlock_irqrestore(&clock_lock, flags);
107 if (unlikely(clk->flags & CLK_RATE_PROPAGATES))
110 for (i = 0; loongson2_clockmod_table[i].frequency != CPUFREQ_TABLE_END;
112 if (loongson2_clockmod_table[i].frequency ==
113 CPUFREQ_ENTRY_INVALID)
115 if (rate == loongson2_clockmod_table[i].frequency)
118 if (rate != loongson2_clockmod_table[i].frequency)
123 regval = LOONGSON_CHIPCFG0;
124 regval = (regval & ~0x7) | (loongson2_clockmod_table[i].index - 1);
125 LOONGSON_CHIPCFG0 = regval;
129 EXPORT_SYMBOL_GPL(clk_set_rate);
131 long clk_round_rate(struct clk *clk, unsigned long rate)
133 if (likely(clk->ops && clk->ops->round_rate)) {
134 unsigned long flags, rounded;
136 spin_lock_irqsave(&clock_lock, flags);
137 rounded = clk->ops->round_rate(clk, rate);
138 spin_unlock_irqrestore(&clock_lock, flags);
145 EXPORT_SYMBOL_GPL(clk_round_rate);