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/* arch/arm/mach-lh7a40x/clocks.c
*
* Copyright (C) 2004 Marc Singer
*
* 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/cpufreq.h>
#include <asm/hardware.h>
#include <asm/arch/clocks.h>
#include <linux/err.h>
struct module;
struct icst525_params;
struct clk {
struct list_head node;
unsigned long rate;
struct module *owner;
const char *name;
// void *data;
// const struct icst525_params *params;
// void (*setvco)(struct clk *, struct icst525_vco vco);
};
int clk_register(struct clk *clk);
void clk_unregister(struct clk *clk);
/* ----- */
#define MAINDIV1(c) (((c) >> 7) & 0x0f)
#define MAINDIV2(c) (((c) >> 11) & 0x1f)
#define PS(c) (((c) >> 18) & 0x03)
#define PREDIV(c) (((c) >> 2) & 0x1f)
#define HCLKDIV(c) (((c) >> 0) & 0x02)
#define PCLKDIV(c) (((c) >> 16) & 0x03)
unsigned int cpufreq_get (unsigned int cpu) /* in kHz */
{
return fclkfreq_get ()/1000;
}
EXPORT_SYMBOL(cpufreq_get);
unsigned int fclkfreq_get (void)
{
unsigned int clkset = CSC_CLKSET;
unsigned int gclk
= XTAL_IN
/ (1 << PS(clkset))
* (MAINDIV1(clkset) + 2)
/ (PREDIV(clkset) + 2)
* (MAINDIV2(clkset) + 2)
;
return gclk;
}
unsigned int hclkfreq_get (void)
{
unsigned int clkset = CSC_CLKSET;
unsigned int hclk = fclkfreq_get () / (HCLKDIV(clkset) + 1);
return hclk;
}
unsigned int pclkfreq_get (void)
{
unsigned int clkset = CSC_CLKSET;
int pclkdiv = PCLKDIV(clkset);
unsigned int pclk;
if (pclkdiv == 0x3)
pclkdiv = 0x2;
pclk = hclkfreq_get () / (1 << pclkdiv);
return pclk;
}
/* ----- */
static LIST_HEAD(clocks);
static DECLARE_MUTEX(clocks_sem);
struct clk *clk_get (struct device *dev, const char *id)
{
struct clk *p;
struct clk *clk = ERR_PTR(-ENOENT);
down (&clocks_sem);
list_for_each_entry (p, &clocks, node) {
if (strcmp (id, p->name) == 0
&& try_module_get(p->owner)) {
clk = p;
break;
}
}
up (&clocks_sem);
return clk;
}
EXPORT_SYMBOL(clk_get);
void clk_put (struct clk *clk)
{
module_put(clk->owner);
}
EXPORT_SYMBOL(clk_put);
int clk_enable (struct clk *clk)
{
return 0;
}
EXPORT_SYMBOL(clk_enable);
void clk_disable (struct clk *clk)
{
}
EXPORT_SYMBOL(clk_disable);
int clk_use (struct clk *clk)
{
return 0;
}
EXPORT_SYMBOL(clk_use);
void clk_unuse (struct clk *clk)
{
}
EXPORT_SYMBOL(clk_unuse);
unsigned long clk_get_rate (struct clk *clk)
{
return clk->rate;
}
EXPORT_SYMBOL(clk_get_rate);
long clk_round_rate (struct clk *clk, unsigned long rate)
{
return rate;
}
EXPORT_SYMBOL(clk_round_rate);
int clk_set_rate (struct clk *clk, unsigned long rate)
{
int ret = -EIO;
return ret;
}
EXPORT_SYMBOL(clk_set_rate);
#if 0
/*
* These are fixed clocks.
*/
static struct clk kmi_clk = {
.name = "KMIREFCLK",
.rate = 24000000,
};
static struct clk uart_clk = {
.name = "UARTCLK",
.rate = 24000000,
};
static struct clk mmci_clk = {
.name = "MCLK",
.rate = 33000000,
};
#endif
static struct clk clcd_clk = {
.name = "CLCDCLK",
.rate = 0,
};
int clk_register (struct clk *clk)
{
down (&clocks_sem);
list_add (&clk->node, &clocks);
up (&clocks_sem);
return 0;
}
EXPORT_SYMBOL(clk_register);
void clk_unregister (struct clk *clk)
{
down (&clocks_sem);
list_del (&clk->node);
up (&clocks_sem);
}
EXPORT_SYMBOL(clk_unregister);
static int __init clk_init (void)
{
clk_register(&clcd_clk);
return 0;
}
arch_initcall(clk_init);
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