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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 <mach/hardware.h>
#include <mach/clocks.h>
#include <linux/err.h>
#include <linux/device.h>
#include <linux/string.h>

struct module;

struct clk {
      struct list_head node;
      unsigned long rate;
      struct module *owner;
      const char *name;
};

/* ----- */

#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 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;
}

/* ----- */

struct clk *clk_get (struct device *dev, const char *id)
{
      return dev && strcmp(dev_name(dev), "cldc-lh7a40x") == 0
             ? NULL : ERR_PTR(-ENOENT);
}
EXPORT_SYMBOL(clk_get);

void clk_put (struct clk *clk)
{
}
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);

unsigned long clk_get_rate (struct clk *clk)
{
      return 0;
}
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)
{
      return -EIO;
}
EXPORT_SYMBOL(clk_set_rate);

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