Logo Search packages:      
Sourcecode: linux-2.6 version File versions  Download package

clocks.c

/* 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/config.h>
#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);

Generated by  Doxygen 1.6.0   Back to index