1 /* arch/arm/mach-lh7a40x/clocks.c
3 * Copyright (C) 2004 Marc Singer
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License
7 * version 2 as published by the Free Software Foundation.
11 #include <linux/cpufreq.h>
12 #include <mach/hardware.h>
13 #include <mach/clocks.h>
14 #include <linux/err.h>
17 struct icst525_params;
20 struct list_head node;
25 // const struct icst525_params *params;
26 // void (*setvco)(struct clk *, struct icst525_vco vco);
29 int clk_register(struct clk *clk);
30 void clk_unregister(struct clk *clk);
34 #define MAINDIV1(c) (((c) >> 7) & 0x0f)
35 #define MAINDIV2(c) (((c) >> 11) & 0x1f)
36 #define PS(c) (((c) >> 18) & 0x03)
37 #define PREDIV(c) (((c) >> 2) & 0x1f)
38 #define HCLKDIV(c) (((c) >> 0) & 0x02)
39 #define PCLKDIV(c) (((c) >> 16) & 0x03)
41 unsigned int cpufreq_get (unsigned int cpu) /* in kHz */
43 return fclkfreq_get ()/1000;
45 EXPORT_SYMBOL(cpufreq_get);
47 unsigned int fclkfreq_get (void)
49 unsigned int clkset = CSC_CLKSET;
53 * (MAINDIV1(clkset) + 2)
54 / (PREDIV(clkset) + 2)
55 * (MAINDIV2(clkset) + 2)
60 unsigned int hclkfreq_get (void)
62 unsigned int clkset = CSC_CLKSET;
63 unsigned int hclk = fclkfreq_get () / (HCLKDIV(clkset) + 1);
68 unsigned int pclkfreq_get (void)
70 unsigned int clkset = CSC_CLKSET;
71 int pclkdiv = PCLKDIV(clkset);
75 pclk = hclkfreq_get () / (1 << pclkdiv);
82 static LIST_HEAD(clocks);
83 static DECLARE_MUTEX(clocks_sem);
85 struct clk *clk_get (struct device *dev, const char *id)
88 struct clk *clk = ERR_PTR(-ENOENT);
91 list_for_each_entry (p, &clocks, node) {
92 if (strcmp (id, p->name) == 0
93 && try_module_get(p->owner)) {
102 EXPORT_SYMBOL(clk_get);
104 void clk_put (struct clk *clk)
106 module_put(clk->owner);
108 EXPORT_SYMBOL(clk_put);
110 int clk_enable (struct clk *clk)
114 EXPORT_SYMBOL(clk_enable);
116 void clk_disable (struct clk *clk)
119 EXPORT_SYMBOL(clk_disable);
121 int clk_use (struct clk *clk)
125 EXPORT_SYMBOL(clk_use);
127 void clk_unuse (struct clk *clk)
130 EXPORT_SYMBOL(clk_unuse);
132 unsigned long clk_get_rate (struct clk *clk)
136 EXPORT_SYMBOL(clk_get_rate);
138 long clk_round_rate (struct clk *clk, unsigned long rate)
142 EXPORT_SYMBOL(clk_round_rate);
144 int clk_set_rate (struct clk *clk, unsigned long rate)
149 EXPORT_SYMBOL(clk_set_rate);
153 * These are fixed clocks.
155 static struct clk kmi_clk = {
160 static struct clk uart_clk = {
165 static struct clk mmci_clk = {
171 static struct clk clcd_clk = {
176 int clk_register (struct clk *clk)
179 list_add (&clk->node, &clocks);
183 EXPORT_SYMBOL(clk_register);
185 void clk_unregister (struct clk *clk)
188 list_del (&clk->node);
191 EXPORT_SYMBOL(clk_unregister);
193 static int __init clk_init (void)
195 clk_register(&clcd_clk);
198 arch_initcall(clk_init);